I'd be curious what the expected behavior should be if linux sees a packet
arriving on an interface matching it's dl_src/src_ip. (Since this should
have probably gone through lo ).
I also enabled log_martians and it's not saying anything about this.
Thanks,
Aaron
On Tue, Jan 10, 2012 at 1:32 PM, Aaron Rosen <aro...@clemson.edu> wrote:
> These packets are the normal SYN packets to initial a TCP connection.
>
> The weird thing though is if I use this flow_mod it works fine: (using a
> fake ip/mac as the response).
>
> cookie=0x0, duration=6.622s, table=0, n_packets=93776, n_bytes=6191149,
> idle_timeout=100,priority=65535,tcp,in_port=65534,vlan_tci=0x0000,dl_src=00:1f:29:32:92:4d,dl_dst=00:1b:21:6a:85:88,nw_src=10.0.0.10,nw_dst=10.0.0.13,nw_tos=0,tp_src=53641,tp_dst=5004
> actions=mod_dl_src:66:f3:43:38:f4:a2,mod_dl_dst:00:1f:29:32:92:4d,mod_nw_src:10.0.0.100,mod_nw_dst:10.0.0.10,mod_tp_dst:9877,IN_PORT
>
>
> Then on return packets for that I have this: (so the client is tricked in
> to connecting to 10.0.0.100 which is really it's self. Though I don't want
> to have to rely on having an extra IP to do this.
>
> cookie=0x0, duration=6.622s, table=0, n_packets=143378,
> n_bytes=158529948,
> idle_timeout=100,tcp,in_port=65534,dl_src=00:1f:29:32:92:4d,nw_src=10.0.0.10,nw_dst=10.0.0.100,tp_src=9877,tp_dst=53641
> actions=mod_dl_src:00:1b:21:6a:85:88,mod_dl_dst:00:1f:29:32:92:4d,mod_nw_dst:10.0.0.10,mod_nw_src:10.0.0.13,mod_tp_src:5004,IN_PORT
>
>
>
> On Tue, Jan 10, 2012 at 1:21 PM, Ben Pfaff <b...@nicira.com> wrote:
>
>> The datapath actions look like what I'd expect to see. I'd expect the
>> modified packets to show up in tcpdump. I see that there are only two
>> such packets over an 18-second period. Can you send them faster? It
>> looks like the second packet didn't get caught by the kernel flow
>> ("used:never") so both packets were actually processed in userspace;
>> perhaps there is a bug in the userspace processing, which is currently
>> in transition.
>>
>> On Tue, Jan 10, 2012 at 01:12:59PM -0500, Aaron Rosen wrote:
>> > pg46 openvswitch # ovs-ofctl dump-flows dp0
>> > NXST_FLOW reply (xid=0x4):
>> > # Removed other flows here for paste...
>> > cookie=0x0, duration=18.467s, table=0, n_packets=2, n_bytes=148,
>> >
>> idle_timeout=100,priority=65535,tcp,in_port=65534,vlan_tci=0x0000,dl_src=00:1f:29:32:92:4d,dl_dst=00:1b:21:6a:85:88,nw_src=10.0.0.10,nw_dst=10.0.0.13,nw_tos=0,tp_src=58209,tp_dst=5004
>> >
>> actions=mod_dl_src:00:1f:29:32:92:4d,mod_dl_dst:00:1f:29:32:92:4d,mod_nw_src:10.0.0.10,mod_nw_dst:10.0.0.10,mod_tp_dst:9877,IN_PORT
>> > *
>> > *
>> > pg46 openvswitch # ovs-dpctl dump-flows dp0
>> >
>> in_port(0),eth(src=00:1f:29:32:92:4d,dst=00:1b:21:6a:85:88),eth_type(0x0800),ipv4(src=10.0.0.10,dst=10.0.0.13,proto=6,tos=0,ttl=64,frag=no),tcp(src=58209,dst=5004),
>> > packets:0, bytes:0, used:never,
>> >
>> actions:set(eth(src=00:1f:29:32:92:4d,dst=00:1f:29:32:92:4d)),set(ipv4(src=10.0.0.10,dst=10.0.0.10,proto=6,tos=0,ttl=64,frag=no)),set(tcp(src=58209,dst=9877)),0
>> >
>> >
>> > pg46 openvswitch # ovs-appctl -t ovs-vswitchd ofproto/trace dp0
>> >
>> 'in_port(0),eth(src=00:1f:29:32:92:4d,dst=00:1b:21:6a:85:88),eth_type(0x0800),ipv4(src=10.0.0.10,dst=10.0.0.13,proto=6,tos=0,ttl=64,frag=no),tcp(src=58209,dst=5004)'
>> > Flow: priority0:tunnel0:in_portfffe:tci(0)
>> > mac00:1f:29:32:92:4d->00:1b:21:6a:85:88 type0800 proto6 tos0 ttl64
>> > ip10.0.0.10->10.0.0.13 port58209->5004
>> > Rule: table=0 cookie=0
>> >
>> priority=65535,tcp,in_port=65534,vlan_tci=0x0000,dl_src=00:1f:29:32:92:4d,dl_dst=00:1b:21:6a:85:88,nw_src=10.0.0.10,nw_dst=10.0.0.13,nw_tos=0,tp_src=58209,tp_dst=5004
>> > OpenFlow
>> >
>> actions=mod_dl_src:00:1f:29:32:92:4d,mod_dl_dst:00:1f:29:32:92:4d,mod_nw_src:10.0.0.10,mod_nw_dst:10.0.0.10,mod_tp_dst:9877,IN_PORT
>> >
>> > Final flow: priority0:tunnel0:in_portfffe:tci(0)
>> > mac00:1f:29:32:92:4d->00:1f:29:32:92:4d type0800 proto6 tos0 ttl64
>> > ip10.0.0.10->10.0.0.10 port58209->9877
>> > Datapath actions:
>> >
>> set(eth(src=00:1f:29:32:92:4d,dst=00:1f:29:32:92:4d)),set(ipv4(src=10.0.0.10,dst=10.0.0.10,proto=6,tos=0,ttl=64,frag=no)),set(tcp(src=58209,dst=9877)),0
>> >
>> >
>> > On Tue, Jan 10, 2012 at 12:28 PM, Ben Pfaff <b...@nicira.com> wrote:
>> > > On Tue, Jan 10, 2012 at 12:15:39PM -0500, Aaron Rosen wrote:
>> > >> Hello,
>> > >>
>> > >> I have a quick question about what could be happening to these
>> packets.
>> > >>
>> > >> I start a tcp connection 10.0.0.10 > 10.0.0.13:
>> > >>
>> > >> 12:02:55.961344 00:1f:29:32:92:4d (oui Unknown) > 00:1b:21:6a:85:88
>> > >> (oui Unknown), ethertype IPv4 (0x0800), length 74: 10.0.0.10.50490 >
>> > >> 10.0.0.13.5004: S
>> > >>
>> > >> Then the following flow entry is installed in order to handle this
>> flow:
>> > >>
>> > >> ?cookie=0x0, duration=4.55s, table=0, n_packets=1, n_bytes=74,
>> > >>
>> >
>> idle_timeout=10,priority=65535,tcp,in_port=65534,vlan_tci=0x0000,dl_src=00:1f:29:32:92:4d,dl_dst=00:1b:21:6a:85:88,nw_src=10.0.0.10,nw_dst=10.0.0.13,nw_tos=0,tp_src=50490,tp_dst=5004
>> > >>
>> >
>> actions=mod_dl_src:00:1f:29:32:92:4d,mod_dl_dst:00:1f:29:32:92:4d,mod_nw_src:10.0.0.10,mod_nw_dst:10.0.0.10,mod_tp_dst:9877,IN_PORT
>> > >>
>> > >>
>> > >> Though, I never see these packets come back in on the interface that
>> > >> it went out on.
>> > >
>> > > What does "ovs-appctl ofproto/trace" or "ovs-dpctl dump-flows" show
>> > > happening to the packets?
>> >
>> >
>> >
>> > --
>> > Aaron O. Rosen
>> > Masters Student - Network Communication
>> > 306B Fluor Daniel
>>
>
>
>
> --
> Aaron O. Rosen
> Masters Student - Network Communication
> 306B Fluor Daniel
>
>
>
--
Aaron O. Rosen
Masters Student - Network Communication
306B Fluor Daniel
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