Internal TCP functions

Collaboration diagram for Internal TCP functions:

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)

Detailed Description

Most user-space programs will never need these.

Function Documentation

nfq_tcp_compute_checksum_ipv4()

void nfq_tcp_compute_checksum_ipv4	(	struct tcphdr *	tcph,
		struct iphdr *	iph
	)

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()

void nfq_tcp_compute_checksum_ipv6	(	struct tcphdr *	tcph,
		struct ip6_hdr *	ip6h
	)

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.