Hi vpp devs,
After this patch in VPP: https://gerrit.fd.io/r/#/c/15759/
our DHCP relay tests started to fail. The configuration seems to be written
correctly (same as before, commands for VPP on DUT1 in attachment), but when
actual packet is received the vpp seems to crash. Sometimes there are
postmortem api files generated but I haven't seen a core dump file. VPP is
restarted for sure. It has different PID afterwards and configuration is lost.
What I managed to figure out is that it happens after DHCP option 82 packet is
sent from TG to DUT1 (attached).
Topology:
# +------+ +-----+ port1
# | | port1 port3 | +------+
# | DUT1 +-----------------+ TG | |
# | +-----------------+ +------+
# | | port2 port4 | | port2
# +-+-+--+ +-+-+-+
The packet is sent from port3 on TG, then it passes to DUT1 where vpp is
running and has both ports enabled and IP assigned. The other port on TG is
running a DHCP server. VPP is set as a DHCP relay to pass the requests sent
from port3 on TG to port4 on TG where DHCP server is running. But as I said vpp
crashes when the packet is received. I tried to run it with "dut1 vpp
commands.txt" configuration on clean vpp. After the same packet is sent VPP
crashes. So this is the only configuration needed to replicate this behavior on
such setup.
I used the script provided by CSIT to generate the packet
https://gerrit.fd.io/r/gitweb?p=csit.git;a=blob;f=resources/traffic_scripts/dhcp/send_and_check_proxy_discover.py;h=d8089713fd10643f92d178bbe024cf4b04ed7e94;hb=refs/heads/master
The command looks like this:
sudo -S sh -c "cd ~/openvpp-testing; virtualenv --system-site-packages
--never-download env && export PYTHONPATH=\${PWD}; . \${PWD}/env/bin/activate;
resources/traffic_scripts/dhcp/send_and_check_proxy_messages.py --tx_if enp0s17
--rx_if enp0s16 --server_ip 192.168.0.100 --server_mac 08:00:27:20:b0:38
--client_ip 172.16.0.2 --client_mac 08:00:27:62:73:6e --proxy_ip 172.16.0.1"
Can someone take a look?
Thanks
Michal
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Michal Cmarada
Engineer - Software
mcmar...@cisco.com<mailto:mcmar...@cisco.com>
Tel:
Cisco Systems, Inc.
Slovakia
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Sending packet out of ens7 of len 286
###[ Ethernet ]###
dst = ff:ff:ff:ff:ff:ff
src = fa:16:3e:2b:11:9e
type = 0x800
###[ IP ]###
version = 4L
ihl = 5L
tos = 0x0
len = 272
id = 1
flags =
frag = 0L
ttl = 64
proto = udp
chksum = 0x79dd
src = 0.0.0.0
dst = 255.255.255.255
\options \
###[ UDP ]###
sport = bootpc
dport = bootps
len = 252
chksum = 0x889
###[ BOOTP ]###
op = BOOTREQUEST
htype = 1
hlen = 6
hops = 0
xid = 0
secs = 0
flags =
ciaddr = 0.0.0.0
yiaddr = 0.0.0.0
siaddr = 0.0.0.0
giaddr = 0.0.0.0
chaddr =
'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
sname =
'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
file =
'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
options = 'c\x82Sc'
###[ DHCP options ]###
options = [message-type=discover end]
dut1:~$ sudo vppctl set int ip address GigabitEthernet0/9/0 192.168.0.1/24
dut1:~$ sudo vppctl set int state GigabitEthernet0/9/0 up
dut1:~$ sudo vppctl set int ip address GigabitEthernet0/a/0 172.16.0.1/24
dut1:~$ sudo vppctl set int state GigabitEthernet0/a/0 up
dut1:~$ vppctl set dhcp proxy server 192.168.0.100 src-address 172.16.0.1
clib_socket_init: connect (fd 3, '/run/vpp/cli.sock'): Permission denied
dut1:~$ sudo vppctl set dhcp proxy server 192.168.0.100 src-address 172.16.0.1
dut1:~$ sudo vppctl sh int address
GigabitEthernet0/10/0 (dn):
GigabitEthernet0/11/0 (dn):
GigabitEthernet0/9/0 (up):
L3 192.168.0.1/24
GigabitEthernet0/a/0 (up):
L3 172.16.0.1/24
local0 (dn):
dut1:~$ sudo vppctl sh dhcp proxy
RX FIB Src Address Servers FIB,Address
0 172.16.0.1 0,192.168.0.100
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