slirp: Factorizing tcpiphdr structure with an union
This patch factorizes the tcpiphdr structure to put the IPv4 fields in an union, for addition of version 6 in further patch. Using some macros, retrocompatibility of the existing code is assured. This patch also fixes the SLIRP_MSIZE and margin computation in various functions, and makes them compatible with the new tcpiphdr structure, whose size will be bigger than sizeof(struct tcphdr) + sizeof(struct ip) Signed-off-by: NGuillaume Subiron <maethor@subiron.org> Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org> Reviewed-by: NThomas Huth <thuth@redhat.com>
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