Tor transparent IPv6 destination_from_socket(): Bug

[avengermsoft]

Configuration file torrc

User root
PidFile /opt/var/run/tor.pid
#Log info file /opt/var/log/tor.log
Log notice file /opt/var/log/tor.log
ExcludeExitNodes {RU},{UA},{AM},{KG},{BY}
StrictNodes 1
TransPort 192.168.97.97:9151
TransPort [::]:9151
ExitRelay 0
GeoIPFile /opt/share/tor/geoip
GeoIPv6File /opt/share/tor/geoip6
DataDirectory /opt/var/lib/tor
VirtualAddrNetwork 10.192.0.0/10
VirtualAddrNetworkIPv6 [fc00::]/7
DNSPort 127.0.0.1:9153
DNSPort [::1]:9153
AutomapHostsOnResolve 1
ClientUseIPv4 0
ClientUseIPv6 1

Redirecting traffic to the port 9151 goes through ip6tables.

ip6tables -t filter -A INPUT -p tcp --dport 9040 -j ACCEPT 
ip6tables -t nat -A PREROUTING -p tcp -d fc00::/7 -j REDIRECT --to-port 9151 
ip6tables -t nat -A OUTPUT -p tcp -d fc00::/7 -j REDIRECT --to-port 9151

I start curl -6 -v http://www.flibustahezeous3.onion/ and get an error

Nov 18 01:04:06.000 [notice] Tor 0.4.1.6 opening new log file.
Nov 18 01:04:06.589 [notice] Tor 0.4.1.6 running on Linux with Libevent 2.1.8-stable, OpenSSL 1.1.1d, Zlib 1.2.11, Liblzma N/A, and Libzstd N/A.

Nov 18 01:08:27.257 [notice] Opening Socks listener on 127.0.0.1:9050
Nov 18 01:08:27.257 [notice] Opened Socks listener on 127.0.0.1:9050
Nov 18 01:08:27.257 [notice] Opening DNS listener on 127.0.0.1:9153
Nov 18 01:08:27.257 [notice] Opened DNS listener on 127.0.0.1:9153
Nov 18 01:08:27.257 [notice] Opening DNS listener on [::1]:9153
Nov 18 01:08:27.257 [notice] Opened DNS listener on [::1]:9153
Nov 18 01:08:27.257 [notice] Opening Transparent pf/netfilter listener on 192.168.97.97:9151
Nov 18 01:08:27.257 [notice] Opened Transparent pf/netfilter listener on 192.168.97.97:9151
Nov 18 01:08:27.257 [notice] Opening Transparent pf/netfilter listener on [::]:9151
Nov 18 01:08:27.257 [notice] Opened Transparent pf/netfilter listener on [::]:9151
Nov 18 01:08:38.000 [notice] Bootstrapped 100% (done): Done

Nov 18 10:23:58.000 [warn] destination_from_socket(): Bug: Received transparent data from an unsuported socket family 10 (on Tor 0.4.1.6 )
Nov 18 10:23:58.000 [warn] Fetching original destination failed. Closing.

I start curl -4 -v http://www.flibustahezeous3.onion/ and everything is fine. IPv4 IS OK.

How to fix?

[avengermsoft]

Compiled with the Linux Kernel version 4.9 and Tor is works. The thing is compilation flags - HAVE_LINUX_NETFILTER_IPV6_IP6_TABLES_H, TRANS_NETFILTER and TRANS_NETFILTER_IPV6. Please close ticket.

[arma]

Maybe we should improve the log message to indicate likely problems with missing headers or missing kernel functionality?

We are in theory supposed to have zero "Bug:" logs in Tor -- they indicate that we are not handling failures well internally.