493 lines
22 KiB
Python
493 lines
22 KiB
Python
# P2P group formation test cases
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# Copyright (c) 2013-2014, Jouni Malinen <j@w1.fi>
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#
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# This software may be distributed under the terms of the BSD license.
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# See README for more details.
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import logging
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logger = logging.getLogger()
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import time
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import threading
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import Queue
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import hwsim_utils
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import utils
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def check_grpform_results(i_res, r_res):
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if i_res['result'] != 'success' or r_res['result'] != 'success':
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raise Exception("Failed group formation")
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if i_res['ssid'] != r_res['ssid']:
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raise Exception("SSID mismatch")
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if i_res['freq'] != r_res['freq']:
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raise Exception("freq mismatch")
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if 'go_neg_freq' in r_res and i_res['go_neg_freq'] != r_res['go_neg_freq']:
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raise Exception("go_neg_freq mismatch")
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if i_res['freq'] != i_res['go_neg_freq']:
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raise Exception("freq/go_neg_freq mismatch")
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if i_res['role'] != i_res['go_neg_role']:
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raise Exception("role/go_neg_role mismatch")
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if 'go_neg_role' in r_res and r_res['role'] != r_res['go_neg_role']:
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raise Exception("role/go_neg_role mismatch")
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if i_res['go_dev_addr'] != r_res['go_dev_addr']:
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raise Exception("GO Device Address mismatch")
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def go_neg_init(i_dev, r_dev, pin, i_method, i_intent, res):
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logger.debug("Initiate GO Negotiation from i_dev")
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try:
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i_res = i_dev.p2p_go_neg_init(r_dev.p2p_dev_addr(), pin, i_method, timeout=20, go_intent=i_intent)
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logger.debug("i_res: " + str(i_res))
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except Exception, e:
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i_res = None
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logger.info("go_neg_init thread caught an exception from p2p_go_neg_init: " + str(e))
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res.put(i_res)
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def go_neg_pin(i_dev, r_dev, i_intent=None, r_intent=None, i_method='enter', r_method='display'):
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r_dev.p2p_listen()
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i_dev.p2p_listen()
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pin = r_dev.wps_read_pin()
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logger.info("Start GO negotiation " + i_dev.ifname + " -> " + r_dev.ifname)
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r_dev.dump_monitor()
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res = Queue.Queue()
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t = threading.Thread(target=go_neg_init, args=(i_dev, r_dev, pin, i_method, i_intent, res))
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t.start()
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logger.debug("Wait for GO Negotiation Request on r_dev")
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ev = r_dev.wait_global_event(["P2P-GO-NEG-REQUEST"], timeout=15)
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if ev is None:
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raise Exception("GO Negotiation timed out")
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r_dev.dump_monitor()
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logger.debug("Re-initiate GO Negotiation from r_dev")
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r_res = r_dev.p2p_go_neg_init(i_dev.p2p_dev_addr(), pin, r_method, go_intent=r_intent, timeout=20)
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logger.debug("r_res: " + str(r_res))
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r_dev.dump_monitor()
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t.join()
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i_res = res.get()
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if i_res is None:
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raise Exception("go_neg_init thread failed")
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logger.debug("i_res: " + str(i_res))
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logger.info("Group formed")
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hwsim_utils.test_connectivity_p2p(r_dev, i_dev)
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i_dev.dump_monitor()
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return [i_res, r_res]
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def go_neg_pin_authorized(i_dev, r_dev, i_intent=None, r_intent=None, expect_failure=False, i_go_neg_status=None, i_method='enter', r_method='display', test_data=True, i_freq=None, r_freq=None):
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r_dev.p2p_listen()
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i_dev.p2p_listen()
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pin = r_dev.wps_read_pin()
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logger.info("Start GO negotiation " + i_dev.ifname + " -> " + r_dev.ifname)
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r_dev.p2p_go_neg_auth(i_dev.p2p_dev_addr(), pin, r_method, go_intent=r_intent, freq=r_freq)
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i_res = i_dev.p2p_go_neg_init(r_dev.p2p_dev_addr(), pin, i_method, timeout=20, go_intent=i_intent, expect_failure=expect_failure, freq=i_freq)
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r_res = r_dev.p2p_go_neg_auth_result(expect_failure=expect_failure)
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logger.debug("i_res: " + str(i_res))
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logger.debug("r_res: " + str(r_res))
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r_dev.dump_monitor()
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i_dev.dump_monitor()
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if i_go_neg_status:
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if i_res['result'] != 'go-neg-failed':
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raise Exception("Expected GO Negotiation failure not reported")
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if i_res['status'] != i_go_neg_status:
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raise Exception("Expected GO Negotiation status not seen")
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if expect_failure:
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return
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logger.info("Group formed")
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if test_data:
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hwsim_utils.test_connectivity_p2p(r_dev, i_dev)
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return [i_res, r_res]
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def go_neg_init_pbc(i_dev, r_dev, i_intent, res, freq, provdisc):
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logger.debug("Initiate GO Negotiation from i_dev")
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try:
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i_res = i_dev.p2p_go_neg_init(r_dev.p2p_dev_addr(), None, "pbc",
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timeout=20, go_intent=i_intent, freq=freq,
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provdisc=provdisc)
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logger.debug("i_res: " + str(i_res))
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except Exception, e:
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i_res = None
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logger.info("go_neg_init_pbc thread caught an exception from p2p_go_neg_init: " + str(e))
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res.put(i_res)
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def go_neg_pbc(i_dev, r_dev, i_intent=None, r_intent=None, i_freq=None, r_freq=None, provdisc=False, r_listen=False):
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if r_listen:
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r_dev.p2p_listen()
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else:
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r_dev.p2p_find(social=True)
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i_dev.p2p_find(social=True)
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logger.info("Start GO negotiation " + i_dev.ifname + " -> " + r_dev.ifname)
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r_dev.dump_monitor()
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res = Queue.Queue()
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t = threading.Thread(target=go_neg_init_pbc, args=(i_dev, r_dev, i_intent, res, i_freq, provdisc))
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t.start()
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logger.debug("Wait for GO Negotiation Request on r_dev")
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ev = r_dev.wait_global_event(["P2P-GO-NEG-REQUEST"], timeout=15)
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if ev is None:
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raise Exception("GO Negotiation timed out")
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r_dev.dump_monitor()
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logger.debug("Re-initiate GO Negotiation from r_dev")
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r_res = r_dev.p2p_go_neg_init(i_dev.p2p_dev_addr(), None, "pbc",
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go_intent=r_intent, timeout=20, freq=r_freq)
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logger.debug("r_res: " + str(r_res))
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r_dev.dump_monitor()
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t.join()
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i_res = res.get()
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if i_res is None:
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raise Exception("go_neg_init_pbc thread failed")
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logger.debug("i_res: " + str(i_res))
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logger.info("Group formed")
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hwsim_utils.test_connectivity_p2p(r_dev, i_dev)
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i_dev.dump_monitor()
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return [i_res, r_res]
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def remove_group(dev1, dev2):
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dev1.remove_group()
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try:
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dev2.remove_group()
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except:
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pass
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def test_grpform(dev):
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"""P2P group formation using PIN and authorized connection (init -> GO)"""
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15,
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r_dev=dev[1], r_intent=0)
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check_grpform_results(i_res, r_res)
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remove_group(dev[0], dev[1])
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def test_grpform_a(dev):
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"""P2P group formation using PIN and authorized connection (init -> GO) (init: group iface)"""
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dev[0].request("SET p2p_no_group_iface 0")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15,
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r_dev=dev[1], r_intent=0)
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if "p2p-wlan" not in i_res['ifname']:
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raise Exception("Unexpected group interface name")
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check_grpform_results(i_res, r_res)
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remove_group(dev[0], dev[1])
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if i_res['ifname'] in utils.get_ifnames():
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raise Exception("Group interface netdev was not removed")
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def test_grpform_b(dev):
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"""P2P group formation using PIN and authorized connection (init -> GO) (resp: group iface)"""
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dev[1].request("SET p2p_no_group_iface 0")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15,
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r_dev=dev[1], r_intent=0)
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if "p2p-wlan" not in r_res['ifname']:
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raise Exception("Unexpected group interface name")
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check_grpform_results(i_res, r_res)
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remove_group(dev[0], dev[1])
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if r_res['ifname'] in utils.get_ifnames():
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raise Exception("Group interface netdev was not removed")
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def test_grpform_c(dev):
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"""P2P group formation using PIN and authorized connection (init -> GO) (group iface)"""
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dev[0].request("SET p2p_no_group_iface 0")
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dev[1].request("SET p2p_no_group_iface 0")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15,
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r_dev=dev[1], r_intent=0)
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if "p2p-wlan" not in i_res['ifname']:
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raise Exception("Unexpected group interface name")
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if "p2p-wlan" not in r_res['ifname']:
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raise Exception("Unexpected group interface name")
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check_grpform_results(i_res, r_res)
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remove_group(dev[0], dev[1])
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if i_res['ifname'] in utils.get_ifnames():
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raise Exception("Group interface netdev was not removed")
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if r_res['ifname'] in utils.get_ifnames():
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raise Exception("Group interface netdev was not removed")
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def test_grpform2(dev):
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"""P2P group formation using PIN and authorized connection (resp -> GO)"""
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go_neg_pin_authorized(i_dev=dev[0], i_intent=0, r_dev=dev[1], r_intent=15)
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remove_group(dev[0], dev[1])
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def test_grpform2_c(dev):
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"""P2P group formation using PIN and authorized connection (resp -> GO) (group iface)"""
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dev[0].request("SET p2p_no_group_iface 0")
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dev[1].request("SET p2p_no_group_iface 0")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=0, r_dev=dev[1], r_intent=15)
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remove_group(dev[0], dev[1])
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if i_res['ifname'] in utils.get_ifnames():
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raise Exception("Group interface netdev was not removed")
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if r_res['ifname'] in utils.get_ifnames():
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raise Exception("Group interface netdev was not removed")
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def test_grpform3(dev):
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"""P2P group formation using PIN and re-init GO Negotiation"""
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go_neg_pin(i_dev=dev[0], i_intent=15, r_dev=dev[1], r_intent=0)
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remove_group(dev[0], dev[1])
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def test_grpform3_c(dev):
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"""P2P group formation using PIN and re-init GO Negotiation (group iface)"""
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dev[0].request("SET p2p_no_group_iface 0")
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dev[1].request("SET p2p_no_group_iface 0")
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[i_res, r_res] = go_neg_pin(i_dev=dev[0], i_intent=15, r_dev=dev[1], r_intent=0)
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remove_group(dev[0], dev[1])
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if i_res['ifname'] in utils.get_ifnames():
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raise Exception("Group interface netdev was not removed")
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if r_res['ifname'] in utils.get_ifnames():
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raise Exception("Group interface netdev was not removed")
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def test_grpform_pbc(dev):
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"""P2P group formation using PBC and re-init GO Negotiation"""
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[i_res, r_res] = go_neg_pbc(i_dev=dev[0], i_intent=15, r_dev=dev[1], r_intent=0)
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check_grpform_results(i_res, r_res)
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if i_res['role'] != 'GO' or r_res['role'] != 'client':
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raise Exception("Unexpected device roles")
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remove_group(dev[0], dev[1])
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def test_grpform_pd(dev):
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"""P2P group formation with PD-before-GO-Neg workaround"""
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[i_res, r_res] = go_neg_pbc(i_dev=dev[0], provdisc=True, r_dev=dev[1], r_listen=True)
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check_grpform_results(i_res, r_res)
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remove_group(dev[0], dev[1])
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def test_both_go_intent_15(dev):
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"""P2P GO Negotiation with both devices using GO intent 15"""
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go_neg_pin_authorized(i_dev=dev[0], i_intent=15, r_dev=dev[1], r_intent=15, expect_failure=True, i_go_neg_status=9)
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def test_both_go_neg_display(dev):
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"""P2P GO Negotiation with both devices trying to display PIN"""
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go_neg_pin_authorized(i_dev=dev[0], r_dev=dev[1], expect_failure=True, i_go_neg_status=10, i_method='display', r_method='display')
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def test_both_go_neg_enter(dev):
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"""P2P GO Negotiation with both devices trying to enter PIN"""
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go_neg_pin_authorized(i_dev=dev[0], r_dev=dev[1], expect_failure=True, i_go_neg_status=10, i_method='enter', r_method='enter')
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def test_grpform_per_sta_psk(dev):
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"""P2P group formation with per-STA PSKs"""
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dev[0].request("P2P_SET per_sta_psk 1")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15, r_dev=dev[1], r_intent=0)
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check_grpform_results(i_res, r_res)
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pin = dev[2].wps_read_pin()
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dev[0].p2p_go_authorize_client(pin)
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c_res = dev[2].p2p_connect_group(dev[0].p2p_dev_addr(), pin, timeout=60)
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check_grpform_results(i_res, c_res)
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if r_res['psk'] == c_res['psk']:
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raise Exception("Same PSK assigned for both clients")
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hwsim_utils.test_connectivity_p2p(dev[1], dev[2])
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dev[0].remove_group()
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dev[1].wait_go_ending_session()
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dev[2].wait_go_ending_session()
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def test_grpform_per_sta_psk_wps(dev):
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"""P2P group formation with per-STA PSKs with non-P2P WPS STA"""
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dev[0].request("P2P_SET per_sta_psk 1")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15, r_dev=dev[1], r_intent=0)
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check_grpform_results(i_res, r_res)
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dev[0].p2p_go_authorize_client_pbc()
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dev[2].request("WPS_PBC")
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ev = dev[2].wait_event(["CTRL-EVENT-CONNECTED"], timeout=30)
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if ev is None:
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raise Exception("Association with the GO timed out")
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hwsim_utils.test_connectivity_p2p_sta(dev[1], dev[2])
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dev[0].remove_group()
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dev[2].request("DISCONNECT")
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dev[1].wait_go_ending_session()
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def test_grpform_force_chan_go(dev):
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"""P2P group formation forced channel selection by GO"""
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15,
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i_freq=2432,
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r_dev=dev[1], r_intent=0,
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test_data=False)
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check_grpform_results(i_res, r_res)
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if i_res['freq'] != "2432":
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raise Exception("Unexpected channel - did not follow GO's forced channel")
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remove_group(dev[0], dev[1])
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def test_grpform_force_chan_cli(dev):
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"""P2P group formation forced channel selection by client"""
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=0,
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i_freq=2417,
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r_dev=dev[1], r_intent=15,
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test_data=False)
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check_grpform_results(i_res, r_res)
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if i_res['freq'] != "2417":
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raise Exception("Unexpected channel - did not follow GO's forced channel")
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remove_group(dev[0], dev[1])
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def test_grpform_force_chan_conflict(dev):
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"""P2P group formation fails due to forced channel mismatch"""
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go_neg_pin_authorized(i_dev=dev[0], i_intent=0, i_freq=2422,
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r_dev=dev[1], r_intent=15, r_freq=2427,
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expect_failure=True, i_go_neg_status=7)
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def test_grpform_pref_chan_go(dev):
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"""P2P group formation preferred channel selection by GO"""
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dev[0].request("SET p2p_pref_chan 81:7")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15,
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r_dev=dev[1], r_intent=0,
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test_data=False)
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check_grpform_results(i_res, r_res)
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if i_res['freq'] != "2442":
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raise Exception("Unexpected channel - did not follow GO's p2p_pref_chan")
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remove_group(dev[0], dev[1])
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def test_grpform_pref_chan_go_overridden(dev):
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"""P2P group formation preferred channel selection by GO overridden by client"""
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dev[1].request("SET p2p_pref_chan 81:7")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=0,
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i_freq=2422,
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r_dev=dev[1], r_intent=15,
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test_data=False)
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check_grpform_results(i_res, r_res)
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if i_res['freq'] != "2422":
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raise Exception("Unexpected channel - did not follow client's forced channel")
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remove_group(dev[0], dev[1])
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def test_grpform_no_go_freq_forcing_chan(dev):
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"""P2P group formation with no-GO freq forcing channel"""
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dev[1].request("SET p2p_no_go_freq 100-200,300,4000-6000")
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=0,
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r_dev=dev[1], r_intent=15,
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test_data=False)
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check_grpform_results(i_res, r_res)
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if int(i_res['freq']) > 4000:
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raise Exception("Unexpected channel - did not follow no-GO freq")
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remove_group(dev[0], dev[1])
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def test_grpform_no_go_freq_conflict(dev):
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"""P2P group formation fails due to no-GO range forced by client"""
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dev[1].request("SET p2p_no_go_freq 2000-3000")
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go_neg_pin_authorized(i_dev=dev[0], i_intent=0, i_freq=2422,
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r_dev=dev[1], r_intent=15,
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expect_failure=True, i_go_neg_status=7)
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def test_grpform_no_5ghz_world_roaming(dev):
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"""P2P group formation with world roaming regulatory"""
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[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=0,
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r_dev=dev[1], r_intent=15,
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test_data=False)
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check_grpform_results(i_res, r_res)
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if int(i_res['freq']) > 4000:
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raise Exception("Unexpected channel - did not follow world roaming rules")
|
|
remove_group(dev[0], dev[1])
|
|
|
|
def test_grpform_no_5ghz_add_cli(dev):
|
|
"""P2P group formation with passive scan 5 GHz and p2p_add_cli_chan=1"""
|
|
dev[0].request("SET p2p_add_cli_chan 1")
|
|
dev[1].request("SET p2p_add_cli_chan 1")
|
|
[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=0,
|
|
r_dev=dev[1], r_intent=14,
|
|
test_data=False)
|
|
check_grpform_results(i_res, r_res)
|
|
if int(i_res['freq']) > 4000:
|
|
raise Exception("Unexpected channel - did not follow world roaming rules")
|
|
remove_group(dev[0], dev[1])
|
|
|
|
def test_grpform_no_5ghz_add_cli2(dev):
|
|
"""P2P group formation with passive scan 5 GHz and p2p_add_cli_chan=1 (reverse)"""
|
|
dev[0].request("SET p2p_add_cli_chan 1")
|
|
dev[1].request("SET p2p_add_cli_chan 1")
|
|
[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=14,
|
|
r_dev=dev[1], r_intent=0,
|
|
test_data=False)
|
|
check_grpform_results(i_res, r_res)
|
|
if int(i_res['freq']) > 4000:
|
|
raise Exception("Unexpected channel - did not follow world roaming rules")
|
|
remove_group(dev[0], dev[1])
|
|
|
|
def test_grpform_no_5ghz_add_cli3(dev):
|
|
"""P2P group formation with passive scan 5 GHz and p2p_add_cli_chan=1 (intent 15)"""
|
|
dev[0].request("SET p2p_add_cli_chan 1")
|
|
dev[1].request("SET p2p_add_cli_chan 1")
|
|
[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=0,
|
|
r_dev=dev[1], r_intent=15,
|
|
test_data=False)
|
|
check_grpform_results(i_res, r_res)
|
|
if int(i_res['freq']) > 4000:
|
|
raise Exception("Unexpected channel - did not follow world roaming rules")
|
|
remove_group(dev[0], dev[1])
|
|
|
|
def test_grpform_no_5ghz_add_cli4(dev):
|
|
"""P2P group formation with passive scan 5 GHz and p2p_add_cli_chan=1 (reverse; intent 15)"""
|
|
dev[0].request("SET p2p_add_cli_chan 1")
|
|
dev[1].request("SET p2p_add_cli_chan 1")
|
|
[i_res, r_res] = go_neg_pin_authorized(i_dev=dev[0], i_intent=15,
|
|
r_dev=dev[1], r_intent=0,
|
|
test_data=False)
|
|
check_grpform_results(i_res, r_res)
|
|
if int(i_res['freq']) > 4000:
|
|
raise Exception("Unexpected channel - did not follow world roaming rules")
|
|
remove_group(dev[0], dev[1])
|
|
|
|
def test_grpform_incorrect_pin(dev):
|
|
"""P2P GO Negotiation with incorrect PIN"""
|
|
dev[1].p2p_listen()
|
|
pin = dev[1].wps_read_pin()
|
|
addr1 = dev[1].p2p_dev_addr()
|
|
if not dev[0].discover_peer(addr1):
|
|
raise Exception("Peer not found")
|
|
dev[1].p2p_go_neg_auth(dev[0].p2p_dev_addr(), pin, 'display', go_intent=0)
|
|
dev[0].request("P2P_CONNECT " + addr1 + " 00000000 enter go_intent=15")
|
|
ev = dev[1].wait_event(["P2P-GROUP-FORMATION-FAILURE"], timeout=10)
|
|
if ev is None:
|
|
raise Exception("Group formation failure timed out")
|
|
ev = dev[0].wait_event(["P2P-GROUP-FORMATION-FAILURE"], timeout=5)
|
|
if ev is None:
|
|
raise Exception("Group formation failure timed out")
|
|
|
|
def test_grpform_reject(dev):
|
|
"""User rejecting group formation attempt by a P2P peer"""
|
|
addr0 = dev[0].p2p_dev_addr()
|
|
dev[0].p2p_listen()
|
|
dev[1].p2p_go_neg_init(addr0, None, "pbc")
|
|
ev = dev[0].wait_global_event(["P2P-GO-NEG-REQUEST"], timeout=15)
|
|
if ev is None:
|
|
raise Exception("GO Negotiation timed out")
|
|
if "FAIL" in dev[0].global_request("P2P_REJECT " + ev.split(' ')[1]):
|
|
raise Exception("P2P_REJECT failed")
|
|
dev[1].request("P2P_STOP_FIND")
|
|
dev[1].p2p_go_neg_init(addr0, None, "pbc")
|
|
ev = dev[1].wait_global_event(["GO-NEG-FAILURE"], timeout=10)
|
|
if ev is None:
|
|
raise Exception("Rejection not reported")
|
|
if "status=11" not in ev:
|
|
raise Exception("Unexpected status code in rejection")
|
|
|
|
def test_grpform_pd_no_probe_resp(dev):
|
|
"""GO Negotiation after PD, but no Probe Response"""
|
|
addr0 = dev[0].p2p_dev_addr()
|
|
addr1 = dev[1].p2p_dev_addr()
|
|
dev[0].p2p_listen()
|
|
if not dev[1].discover_peer(addr0):
|
|
raise Exception("Peer not found")
|
|
dev[1].p2p_stop_find()
|
|
dev[0].p2p_stop_find()
|
|
peer = dev[0].get_peer(addr1)
|
|
if peer['listen_freq'] == '0':
|
|
raise Exception("Peer listen frequency not learned from Probe Request")
|
|
time.sleep(0.3)
|
|
dev[0].request("P2P_FLUSH")
|
|
dev[0].p2p_listen()
|
|
dev[1].global_request("P2P_PROV_DISC " + addr0 + " display")
|
|
ev = dev[0].wait_global_event(["P2P-PROV-DISC-SHOW-PIN"], timeout=5)
|
|
if ev is None:
|
|
raise Exception("PD Request timed out")
|
|
ev = dev[1].wait_global_event(["P2P-PROV-DISC-ENTER-PIN"], timeout=5)
|
|
if ev is None:
|
|
raise Exception("PD Response timed out")
|
|
peer = dev[0].get_peer(addr1)
|
|
if peer['listen_freq'] != '0':
|
|
raise Exception("Peer listen frequency learned unexpectedly from PD Request")
|
|
|
|
pin = dev[0].wps_read_pin()
|
|
if "FAIL" in dev[1].request("P2P_CONNECT " + addr0 + " " + pin + " enter"):
|
|
raise Exception("P2P_CONNECT on initiator failed")
|
|
ev = dev[0].wait_global_event(["P2P-GO-NEG-REQUEST"], timeout=5)
|
|
if ev is None:
|
|
raise Exception("GO Negotiation start timed out")
|
|
peer = dev[0].get_peer(addr1)
|
|
if peer['listen_freq'] == '0':
|
|
raise Exception("Peer listen frequency not learned from PD followed by GO Neg Req")
|
|
if "FAIL" in dev[0].request("P2P_CONNECT " + addr1 + " " + pin + " display"):
|
|
raise Exception("P2P_CONNECT on responder failed")
|
|
ev = dev[0].wait_global_event(["P2P-GROUP-STARTED"], timeout=15)
|
|
if ev is None:
|
|
raise Exception("Group formation timed out")
|
|
ev = dev[1].wait_global_event(["P2P-GROUP-STARTED"], timeout=15)
|
|
if ev is None:
|
|
raise Exception("Group formation timed out")
|