Date: Wed, 25 Sep 2019 15:24:38 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 240819] PF scrub drop UDP Fragment Message-ID: <bug-240819-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D240819 Bug ID: 240819 Summary: PF scrub drop UDP Fragment Product: Base System Version: 12.0-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: fabrice.bruel@orange.com Hello, I've notice a problem with scrub and UDP packet on FreeBSD 12STABLE Version : # uname -a FreeBSD R640-4 12.0-STABLE FreeBSD 12.0-STABLE #1 r348036M: Tue May 21 10:5= 8:21 CEST 2019=20=20=20=20 root@PFWALL-GEN2:/usr/obj/PFWALL.amd64/usr/local/PFWall/FreeBSD/src/amd64.a= md64/sys/PFWALL-AMD64 amd64 Describe : If PF is activated with this scrub option : scrub out all random-id scrub all fragment reassemble UDP fragment doesn't cross PF. removing this 2 line solve the issue. Incoming packet seems to be "bad" in tcpdump : # tcpdump -n -i bxe3 udp tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on bxe3, link-type EN10MB (Ethernet), capture size 262144 bytes 16:23:13.231094 IP 10.2.0.22.2798 > 10.2.0.221.0: UDP, bad length 1420 > 13= 92 16:23:13.231116 IP 10.2.0.22 > 10.2.0.221: ip-proto-17 16:23:14.292550 IP 10.2.0.22.2799 > 10.2.0.221.0: UDP, bad length 1420 > 13= 92 16:23:14.292572 IP 10.2.0.22 > 10.2.0.221: ip-proto-17 16:23:15.354955 IP 10.2.0.22.2800 > 10.2.0.221.0: UDP, bad length 1420 > 13= 92 Note that's the MTU of the egress interface (bxe3 here) is 1500 : # ifconfig bxe3 bxe3: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 =20=20=20=20=20=20=20 options=3D522ba<TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO6,W= OL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO> I've tried to remove tso, rxcsum,tso, with no result. Maybe it's more a IP issue ? How to reproduce :=20 # hping -2 -m 1400 -d 1420 ip_target --=20 You are receiving this mail because: You are the assignee for the bug.=
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