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tests: Add UDP checksum into DHCP frames in ProxyARP/DGAF disabled case

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Previously, the special value 0 was used to indicate no UDP checksum.
Replace that with the calculated checksum for more like use case.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2018-12-30 01:04:03 +02:00
parent 23693c9dac
commit 0456b7d312
1 changed files with 13 additions and 4 deletions
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17
tests/hwsim/test_ap_hs20.py
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@ -4329,7 +4329,7 @@ def test_ap_hs20_proxyarp_enable_dgaf(dev, apdev):
def ip_checksum(buf):
sum = 0
if len(buf) & 0x01:
buf += '\0x00'
buf += '\x00'
for i in range(0, len(buf), 2):
val, = struct.unpack('H', buf[i:i+2])
sum += val
@ -4460,7 +4460,8 @@ def send_na(dev, src_ll=None, target=None, ip_src=None, ip_dst=None, opt=None,
def build_dhcp_ack(dst_ll, src_ll, ip_src, ip_dst, yiaddr, chaddr,
subnet_mask="255.255.255.0", truncated_opt=False,
wrong_magic=False, force_tot_len=None, no_dhcp=False):
wrong_magic=False, force_tot_len=None, no_dhcp=False,
udp_checksum=True):
_dst_ll = binascii.unhexlify(dst_ll.replace(':',''))
_src_ll = binascii.unhexlify(src_ll.replace(':',''))
proto = '\x08\x00'
@ -4500,7 +4501,14 @@ def build_dhcp_ack(dst_ll, src_ll, ip_src, ip_dst, yiaddr, chaddr,
payload = struct.pack('>BBBBL3BB', 2, 1, 6, 0, 12345, 0, 0, 0, 0)
payload += _ciaddr + _yiaddr + _siaddr + _giaddr + _chaddr + 192*'\x00'
udp = struct.pack('>HHHH', 67, 68, 8 + len(payload), 0) + payload
if udp_checksum:
pseudohdr = _ip_src + _ip_dst + struct.pack('>BBH', 0, 17,
8 + len(payload))
udphdr = struct.pack('>HHHH', 67, 68, 8 + len(payload), 0)
checksum, = struct.unpack('>H', ip_checksum(pseudohdr + udphdr + payload))
else:
checksum = 0
udp = struct.pack('>HHHH', 67, 68, 8 + len(payload), checksum) + payload
if force_tot_len:
tot_len = force_tot_len
@ -4692,7 +4700,8 @@ def _test_proxyarp_open(dev, apdev, params, ebtables=False):
# Change address and verify unicast
pkt = build_dhcp_ack(dst_ll=addr0, src_ll=bssid,
ip_src="192.168.1.1", ip_dst="255.255.255.255",
yiaddr="192.168.1.123", chaddr=addr0)
yiaddr="192.168.1.123", chaddr=addr0,
udp_checksum=False)
if "OK" not in hapd.request("DATA_TEST_FRAME ifname=ap-br0 " + binascii.hexlify(pkt)):
raise Exception("DATA_TEST_FRAME failed")