netfilter: nf_reject_ipv6: split nf_send_reset6() in smaller functions
That can be reused by the reject bridge expression to build the reject
packet. The new functions are:
* nf_reject_ip6_tcphdr_get(): to sanitize and to obtain the TCP header.
* nf_reject_ip6hdr_put(): to build the IPv6 header.
* nf_reject_ip6_tcphdr_put(): to build the TCP header.
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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