Jool fails on Ubuntu 20.04 Focal Fossa

[elburb]

jool fails with 'Error: Error receiving the kernel module's response: Invalid input data or parameter' when trying to run on the latest Ubuntu 20.04

Steps to reproduce:

Fresh install of Ubuntu 20.04:

# uname -a
Linux uk-lon4 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Install jool 4.0.8.0 from source or from provided .debs.
The build appears to complete without error.

# dmesg -t | tail -1
NAT64 Jool v4.0.8.0 module inserted.
# jool --version
4.0.8.0

Attempt to add a NAT64 instance:

# jool instance add "example" --iptables --pool6 64:ff9b::/96
Error: Error receiving the kernel module's response: Invalid input data or parameter

[ydahhrk]

Can confirm easily.

Do notice that Jool 4.0.7 made it into Ubuntu 20. As a workaround, try

sudo modprobe -r jool
cd jool-4.0.8
sudo make uninstall
sudo dkms remove jool/4.0.8 --all

sudo apt install jool-dkms jool-tools

That allows me to create the instance.

Of the two bugs 4.0.7 has, only one should affect you, and is easy to prevent. (Delete all instances manually before r-modprobing.)

[elburb]

Thanks, and yes, 4.0.7 does work ok.

[jaki300]

HI @ydahhrk this is not working for me as i am using ubuntu. 20.04
still signature verification error
master:
root@jool-plat-master:/home/gci_gestion# dmesg | grep jool
[ 4.690495] systemd[1]: Set hostname to .
[ 34.703622] jool_common: loading out-of-tree module taints kernel.
[ 34.703735] jool_common: module verification failed: signature and/or required key missing - tainting kernel
root@jool-plat-master:/home/gci_gestion#

Slave:
[227984.036003] joold[95298]: segfault at 7fcc6f946f70 ip 00007fcc709c3a01 sp 00007fcc6f946ec0 error 6 in libc-2.31.so[7fcc7096f000+178000]
[227986.040096] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
[228046.254467] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
[228106.497292] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
[228166.701877] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
[228358.623065] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
[228419.802604] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
[228480.007827] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
[230449.509516] netlink: 4 bytes leftover after parsing attributes in process `jool'.

[ydahhrk]

@jaki300: I think this is a separate issue. And the kernel taint probably doesn't have anything to do with it; it's effectively just a warning.

It seems your joold daemon crashed. May I have your joold configuration?
(But please open a separate issue)

[ydahhrk]

Also, joold's logs would help too.

[jaki300]

{
"multicast address": "ff08::db8:64:64",
"multicast port": "6464",
"in interface": "ens192",
"out interface": "ens192",
"reuseaddr": 1,
"ttl": 3
}

[jaki300]

jool-tools_4.0.9-1_amd64.deb netsocket.json
root@jool-plat-slave:/home/gci_gestion# vi modsocket.json
{
"instance": "default"
}

[jaki300]

6f946f70 ip 00007fcc709c3a01 sp 00007fcc6f946ec0 error 6 in libc-2.31.so[7fcc7096f000+178000]
Jun 8 16:40:58 jool-plat-slave kernel: [227986.040096] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
Jun 8 16:41:58 jool-plat-slave kernel: [228046.254467] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
Jun 8 16:42:58 jool-plat-slave kernel: [228106.497292] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
Jun 8 16:43:58 jool-plat-slave kernel: [228166.701877] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
Jun 8 16:47:10 jool-plat-slave kernel: [228358.623065] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
Jun 8 16:48:11 jool-plat-slave kernel: [228419.802604] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
Jun 8 16:49:12 jool-plat-slave kernel: [228480.007827] Jool WARNING (send_to_userspace): Looks like nobody received my multicast message. Is the joold daemon really active? (errcode -3)
Jun 8 17:22:43 jool-plat-slave joold: Opening file netsocket.json...
Jun 8 17:22:43 jool-plat-slave joold: Getting address info of ff08::db8:64:64#6464...
Jun 8 17:22:43 jool-plat-slave joold: Trying an address candidate...
Jun 8 17:22:43 jool-plat-slave joold: Setting SO_REUSEADDR as 1...
Jun 8 17:22:43 jool-plat-slave joold: The socket to the network was created.
Jun 8 17:22:43 jool-plat-slave joold: Configuring multicast options on the socket...
Jun 8 17:22:43 jool-plat-slave joold: We're now registered to the multicast group.
Jun 8 17:22:43 jool-plat-slave joold: Multicast loopback disabled.
Jun 8 17:22:43 jool-plat-slave joold: Tweaked the TTL of multicasts.
Jun 8 17:22:43 jool-plat-slave joold: The outgoing interface was overridden.
Jun 8 17:22:43 jool-plat-slave joold: Listening...
Jun 8 17:53:18 jool-plat-slave joold: Opening file netsocket.json...
Jun 8 17:53:18 jool-plat-slave joold: Getting address info of ff08::db8:64:64#6464...
Jun 8 17:53:18 jool-plat-slave joold: Trying an address candidate...
Jun 8 17:53:18 jool-plat-slave joold: Setting SO_REUSEADDR as 1...
Jun 8 17:53:18 jool-plat-slave joold: The socket to the network was created.
Jun 8 17:53:18 jool-plat-slave joold: Configuring multicast options on the socket...
Jun 8 17:53:18 jool-plat-slave joold: We're now registered to the multicast group.
Jun 8 17:53:18 jool-plat-slave joold: Multicast loopback disabled.
Jun 8 17:53:18 jool-plat-slave joold: Tweaked the TTL of multicasts.
Jun 8 17:53:18 jool-plat-slave joold: The outgoing interface was overridden.
Jun 8 17:53:18 jool-plat-slave joold: Listening...