tcp_internals(3) Library Functions Manual tcp_internals(3)

tcp_internals - Internal TCP functions


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)

Most user-space programs will never need these.

nfq_tcp_compute_checksum_ipv4 - computes IPv4/TCP packet checksum

Parameters

tcph pointer to the TCP header
iph pointer to the IPv4 header

Note

nfq_tcp_mangle_ipv4() invokes this function. As long as developers always use nfq_tcp_mangle_ipv4 when changing the content of a TCP message, there is no need to call nfq_tcp_compute_checksum_ipv4.

Definition at line 108 of file tcp.c.

nfq_tcp_compute_checksum_ipv6 - computes IPv6/TCP packet checksum

Parameters

tcph pointer to the TCP header
ip6h pointer to the IPv6 header

Note

nfq_tcp_mangle_ipv6() invokes this function. As long as developers always use nfq_tcp_mangle_ipv6 when changing the content of a TCP message, there is no need to call nfq_tcp_compute_checksum_ipv6.

Definition at line 126 of file tcp.c.

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Version 1.0.5 libnetfilter_queue