[Bug 192847] New: ipfilter and bad packets

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192847

            Bug ID: 192847
           Summary: ipfilter and bad packets
           Product: Base System
           Version: 10.0-STABLE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kabalax at gmail.com

Hello,

FreeBSD 10.0-STABLE built from last night.

The kernel was compiled with:

options         IPFILTER
options         IPFILTER_LOG
options         IPFILTER_LOOKUP
options         IPFILTER_DEFAULT_BLOCK

# ipf -V
ipf: IP Filter: v5.1.2 (608)
Kernel: IP Filter: v5.1.2
Running: yes
Log Flags: 0 = none set
Default: block all, Logging: available
Active list: 0
Feature mask: 0x4e

Here is the ruleset:

# ipfstat -in

@1 pass in quick on lo0 from any to any
@2 block in quick on vmx0 from any to any with frag
@3 block in quick on vmx0 proto tcp from any to any with short
@4 block in quick on vmx0 inet from any to any with opt lsrr
@5 block in quick on vmx0 inet from any to any with opt ssrr
@6 block in log first quick on vmx0 proto tcp from any to any flags FPU/FSRPAU
@7 block in quick on vmx0 from any to any with ipopts
@8 pass in quick on vmx0 inet proto tcp from 192.168.60.0/24 to 192.168.60.1/32
port = ssh flags S/FSRPAU keep state
@9 pass in quick on vmx0 inet proto icmp from 192.168.60.0/24 to
192.168.60.1/32 icmp-type echo keep state
@10 block in log quick on vmx0 all

# ipfstat -on

@1 pass out quick on lo0 from any to any
@2 pass out quick on vmx0 proto tcp from any to any port = domain flags
S/FSRPAU keep state
@3 pass out quick on vmx0 proto udp from any to any port = domain keep state
@4 pass out quick on vmx0 proto udp from any to any port = ntp keep state
@5 pass out quick on vmx0 inet proto icmp from any to any icmp-type echo keep
state
@6 block out log quick on vmx0 all

I see a lot of BAD packets in the logs while SSH-ing to the box (the transfer
speed over SCP is also affected).

Aug 19 17:37:26 freebsd-tmpl ipmon[410]: 17:37:26.817761 vmx0 @0:12 b
192.168.60.1,22 -> 192.168.60.21,64962 PR tcp len 20 1532 -AP OUT bad
Aug 19 17:37:26 freebsd-tmpl ipmon[410]: 17:37:26.817966 vmx0 @0:12 b
192.168.60.1,22 -> 192.168.60.21,64962 PR tcp len 20 1616 -AP OUT bad

# ifconfig -m

vmx0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=39b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,TSO6>
capabilities=61079b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWFILTER,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 00:50:56:8a:17:21
        inet 192.168.60.1 netmask 0xffffff00 broadcast 192.168.60.255
        media: Ethernet autoselect
        status: active
        supported media:
                media autoselect

I'd be happy to provide any additional information.

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