I am trying to use netfilter QUEUE to process IP payload in
user-space. So far I have successfully retrived the packet (payload),
done with my processing but I don't know how to put it back (modified
payload) back to original outbound packet.
this is what I have tried:
--------------
len = nfq_get_payload(tb, &payload);
if (len >= 0 ) {
new_len = process_payload(payload, *newPayload, len);
//trying memcpy
memcpy(payload, newPayload, len);
pkt->ip->check = 0;
free(newPayload);
}
return nfq_set_verdict(qh, id, NF_ACCEPT, 0, NULL);
--------------
I tried using memcpy() to copy new payload data to existing, but I
think that is being done on user space only. or do I need to call
some nfa_set.. function ?
I will be glad if someone could point me to right direction.
Thank you,
Bikrant
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