Michael Faber (Diplomand bei Alexander Zimmermann) wrote:
i am doing a modification to the TCP protocol and want to use an
additional bit of the TCP header's Reserved field. I chose to use the
bit next to the Bits used by the ECN mechanism. Therefore i changed the
TCP header definition in include/linux/tcp.h of a 2.6.16.29 Kernel to
struct tcphdr {
__u16 source;
__u16 dest;
__u32 seq;
__u32 ack_seq;
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u16 res1:3,
doff:4,
fin:1,
syn:1,
rst:1,
psh:1,
ack:1,
urg:1,
ece:1,
cwr:1,
elcn:1;
Try putting elcn as the first element in the little endian version,
where you put it completely changes the TCP header layout.
-Brian
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