nfqueue at postrouting hook does not work

[Nayan Gadre <beejoy.nayan@xxxxxxxxx>]

Hi,

I am trying to send packets to a user space application using nfqueue.
I added the following chain and rule.
table ip hotspot {
        chain nchain { # handle 3
                type filter hook postrouting priority 400; policy accept;
                udp sport 53 counter packets 71 bytes 38194 queue num
43 bypass # handle
                udp dport 53 counter packets 73 bytes 5184 queue num
43 bypass # handle 33
        }
}

The counter increments but the application does not receive the packets.

If I try at a different hook position then the application receives it.
table ip hotspot {
        chain dns-snoop-forward { # handle 2
                type filter hook forward priority raw; policy accept;
                udp sport 53 counter packets 23 bytes 12951 queue num
43 bypass #
                udp dport 53 counter packets 28 bytes 2031 queue num
43 bypass # handle
        }
}

1. Does post routing hook not allow nfqueue ?
2. Also Is it possible to send packets to userspace after the
_nf_conntrack_confirm() has confirmed the ct. I tried to change the
static priority of NF_IP_PRI_CONNTRACK_CONFIRM to 350 and added my
hook at 400, but packets were not received by userspace. Anything I am
missing.

Kindly suggest.

Thanks
ngadre