netpfil tests: skip checksum verification in pft_ping.py

From scapy 2.6.0 it now removes (sets to None) the IP checksum in its defrag
code. We typically ask for IPv4 or IPv6 defragmentation, which causes check
function failures.

Just skip the checksum verificiation here, because we're going to notice
incorrect checksums even if the tests don't directly verify it.

MFC after:	1 week
Sponsored by:	Rubicon Communications, LLC ("Netgate")

1 files changed, 0 insertions, 6 deletions

diff --git a/tests/sys/netpfil/common/pft_ping.py b/tests/sys/netpfil/common/pft_ping.py
index 1caa26abe5f6..0d1134a22dda 100644
--- a/tests/sys/netpfil/common/pft_ping.py
+++ b/tests/sys/netpfil/common/pft_ping.py
@@ -205,12 +205,6 @@ def check_ipv4(expect_params, packet):
     if dst_address and ip.dst != dst_address:
         LOGGER.debug(f'Wrong IPv4 destination {ip.dst}, expected {dst_address}')
         return False
-    chksum = ip.chksum
-    ip.chksum = None
-    new_chksum = sp.IP(sp.raw(ip)).chksum
-    if chksum != new_chksum:
-        LOGGER.debug(f'Wrong IPv4 checksum {chksum}, expected {new_chksum}')
-        return False
     if flags and ip.flags != flags:
         LOGGER.debug(f'Wrong IP flags value {ip.flags}, expected {flags}')
         return False