https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256587
Bug ID: 256587
Summary: tcpreplay not working for if_tun (tun0)
Product: Base System
Version: 13.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 225789
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=225789&action=edit
Packet captures from reproducing this issue (cap1.pcap, cap3.pcap,
loopback.pcap)
This is a repeat of Bug #198211. It appears that one cannot send packets to an
if_tun interface using /dev/bpf.
This was previously considered a possibility in
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198211#c1 and
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198211#c3, but it does not
appear that any fix similar to
https://cgit.freebsd.org/src/commit/?h=stable/10&id=71ee29ab93aed361d2718ed46c557eeb0bfd88b8
was applied to if_tun.c (now if_tuntap.c):
https://cgit.freebsd.org/src/tree/sys/net/if_tuntap.c?h=stable/13#n1402
I think that applying the same fix to if_tuntap.c will fix this issue.
## Steps to reproduce:
1. Install tcpreplay with: pkg install tcpreplay
2. Start up a tunnel on tun0 where the remote side responds to ICMP echo
requests. My tunnel was configured as:
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
options=80000<LINKSTATE>
inet 192.0.2.1 --> 192.0.2.2 netmask 0xffffff00
groups: tun
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
Opened by PID 1144
3. Capture a trace on tun0: tcpdump -i tun0 -s 0 -n -w loopback.pcap
4. Generate some traffic on tun0: eg: ping -c3 192.0.2.2
5. Stop the capture, it should have some ICMP packets inside
6. Monitor traffic on tun0: tcpdump -i tun0 -s 0 -n -X
7. Replay the ICMP traffic with: tcpreplay --intf1=tun0 loopback.pcap
## Expected behaviour:
* All ICMP packets are correctly replayed through tun0
## Actual behaviour:
* One packet is sent with af=31 (pseudo_AF_HDRCMPLT), which is invalid (see
attached cap1.pcap)
* tcpreplay reports several warnings:
Warning: Unable to process unsupported DLT type: BSD loopback (0x0)
Warning: Unable to send packet: Error with bpf send() [1]: Address family not
supported by protocol family (errno = 47)
## Attachments (in tun-tcpreplay.zip)
* cap1.pcap: packet capture at reproduction step 5, using tun0 – a single
packet is sent out the tun0 interface with af=31
* cap3.pcap: packet capture reproduction at step 5, but using lo0 – this looks
correct, but still issues the "unsupported DLT type" warning
* loopback.pcap: packet capture at reproduction step 2 using tun0 – three pairs
of ICMP Echo requests and replies 192.0.2.1 -> 192.0.2.2
## Versions:
* FreeBSD 13.0 RELEASE on amd64
* tcpdump 4.9.3
* libpcap 1.9.1
* tcpreplay 4.3.3
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