Hello everyone. I am new to this list, and I'd like to know if I can make a packet, captured through netfilter queueing, bigger. I have created the following function:
#include <libnfnetlink/libnfnetlink.h>
#include <libnetfilter_queue/libnetfilter_queue.h>
struct nfq_data {
struct nfattr **data;
};
void nfq_set_payload_length
(struct nfq_data *nfad, unsigned length)
{
//.. could be an error here if length + NFA_LENGTH(0) > 0xffff..
(nfad->data[NFQA_PAYLOAD-1])->nfa_len = (length + NFA_LENGTH(0));
}
In order to be able to modify the length of a captured packet (in NFQNL_COPY_PACKET mode). Everything about the packet will be in order - recalculated checksums etc). Is this an acceptable approach?
KJ--
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