On Mon, Mar 23, 2015 at 11:25:26AM +0100, Lorenzo Pistone wrote:
> I was hoping you could give me debugging tips. I checked all I could (dmesg,
> echo 1 > rp_filter, strace -f), and I couldn't see anything suspicious. I
> have nothing in my iptables or tc, and tso is off.The exact command line is
> "strace -f trafgen -c theconfig.cfg -o wlp3s0 -n 10".
>
> Il 23/03/2015 10:27, Daniel Borkmann ha scritto:
> >Hi Lorenzo,
> >
> >On 03/22/2015 03:13 PM, Lorenzo Pistone wrote:
> >>Hi,
> >>I'm trying to send UDP packets with zero length withthis simple
> >>configuration on trafgen:
> >>
> >> {
> >> # --- ethernet header ---
> >> 0xbe, 0x15, 0x1d, 0x12, 0x1c, 0x57, # mac destination
> >> 0xfa, 0x16, 0x3e, 0xa0, 0x5d, 0x18, # mac source
> >> const16(0x0800), # protocol
> >> # --- ip header ---
> >> # ipv4 version (4-bit) + ihl (4-bit), tos
> >> 0b01000101, 0,
> >> # ipv4 total len
> >> const16(28),
> >> # id (note: runtime dynamic random)
> >> drnd(2),
> >> # ipv4 3-bit flags + 13-bit fragment offset
> >> # 001 = more fragments
> >> 0b01000000, 0,
> >> 64, # ttl
> >> 17, # proto udp
> >> # dynamic ip checksum (note: offsets are zero indexed)
> >> csumip(14, 33),
> >> 92, 222, 69, 15, # source ip
> >> 85, 214, 106, 103, # dest ip
> >> # --- udp header ---
> >> # as this is a fragment the below stuff does not matter too much
> >> const16(48054), # src port
> >> const16(28785), # dst port
> >> const16(8), # udp length
> >> # udp checksum can be dyn calc via csumudp(offset ip, offset tcp)
> >> # which is csumudp(14, 34), but for udp its allowed to be zero
> >> csumudp(14, 34),
> >> }
> >>
> >>I can send these packets on lo, but trafgen fails to send anything on
> >>real devices. I used both the TX_RING and sendto method.
> >> I've tried with iwlwifi and virtio. mausezahn on the contrary works. I
> >checked with strace and there does not seem to be any
> >> call that returns an error.
> >
> >Thanks for the bug report.
> >
> >Can you provide some more debug information?
> >
> >How do you invoke trafgen? strace -f? Something suspicious in dmesg? ip
> >link?
> >
> >Cheers,
> >Daniel
>
Thats what I got on 3.18 with the same cfg file:
$ trafgen/trafgen -c ~/trafgen.cfg -o wlp3s0 -n 1
4 packets to schedule
168 bytes in total
Running! Hang up with ^C!
0 packets outgoing
0 bytes outgoing
0 sec, 0 usec on CPU0 (0 packets)
0 sec, 0 usec on CPU1 (0 packets)
0 sec, 0 usec on CPU2 (0 packets)
0 sec, 0 usec on CPU3 (0 packets)
Seems packet was not sent from trafgen ?
> --
> You received this message because you are subscribed to the Google Groups
> "netsniff-ng" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected].
> For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google Groups
"netsniff-ng" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
