forwarding/routing traffic (+nat) to gw in a custom routing table

I have two interfaces:
eth0 192.168.122.2
eth1 1.1.1.10

I have a routing table 4, with:
default via 1.1.1.1 dev eth1

I have rules:
32764:     from all to 1.1.1.10 lookup 4
32765:     from 1.1.1.10 lookup 4



If I ping from a natted host to 8.8.8.8, I am getting 
From 192.168.122.2 icmp_seq=1 Destination Net Unreachable

If I know add this rule
ip rule add from 192.168.122.0/24 to 8.8.8.8 lookup 4

The ping starts working. However I need to have this working for 
0.0.0.0/0 except 192.168.122.0/24. How should I implement something 
like:
ip rule add from 192.168.122.0/24 to !192.168.122.0/4 lookup 4