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[IPX]: Annotate and fix IPX checksum
Calculation of IPX checksum got buggered about 2.4.0. The old variant mangled the packet; that got fixed, but calculation itself got buggered. Restored the correct logics, fixed a subtle breakage we used to have even back then: if the sum is 0 mod 0xffff, we want to return 0, not 0xffff. The latter has special meaning for IPX (cheksum disabled). Observation (and obvious fix) nicked from history of FreeBSD ipx_cksum.c... Signed-off-by: Al Viro <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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Al Viro
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David S. Miller
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Nov 5, 2006
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