I am programming with libipq and I got such a problem. First I get a packet via NETLINK socket ipq_packet_msg_t *m = ipq_get_packet(packet); unsigned char *payload = m->payload; and this works well then I send this packet to another program by usual AF_UNIX socket write(sockfd, m, sizeof(ipq_packet_msg_t)); write(sockfd, payload, m->data_len); and this works well, too at last, I recerive this packet in another propram and try to reinject it into kernel read(sockfd, &m, sizeof(m)); read(sockfd, payload, m.data_len); rval = ipq_set_verdict(h, m.packet_id, user_verdict, m.data_len, payload); and this does not work well. Although it seems that the packet has been reinjected into the kernel, the packet is never sent out of my computer. I do this test with a ping packet. (iptables -A OUTPUT -p icmp -j QUEUE) And I did not catch this ping packet through the ether interface by a packet captuer. Excuse me for the poor English, and thanks for your help.
