/usr/include/libnetfilter_queue/libnetfilter_queue_tcp.h is in libnetfilter-queue-dev 1.0.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #ifndef _LIBNFQUEUE_TCP_H_
#define _LIBNFQUEUE_TCP_H_
struct pkt_buff;
struct tcphdr *nfq_tcp_get_hdr(struct pkt_buff *pktb);
void *nfq_tcp_get_payload(struct tcphdr *tcph, struct pkt_buff *pktb);
unsigned int nfq_tcp_get_payload_len(struct tcphdr *tcph, struct pkt_buff *pktb);
struct iphdr;
struct ip6_hdr;
void nfq_tcp_compute_checksum_ipv4(struct tcphdr *tcph, struct iphdr *iph);
void nfq_tcp_compute_checksum_ipv6(struct tcphdr *tcph, struct ip6_hdr *ip6h);
int nfq_tcp_mangle_ipv4(struct pkt_buff *pkt, unsigned int match_offset, unsigned int match_len, const char *rep_buffer, unsigned int rep_len);
int nfq_tcp_snprintf(char *buf, size_t size, const struct tcphdr *tcp);
#endif
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