On Wed, 2003-03-26 at 18:16, Ralf Baechle wrote: > On Wed, Mar 26, 2003 at 08:33:21AM +0000, Gilad Benjamini wrote: > > > ip_fast_csum provides an asm version for IP checksum. > > Any available mips-asm implementation out there for > > a relative checksum? > > > > i.e. I get a packet, change > > a field or two, and want to compute just the > > change in the checksum. > > I suggest to look at the code for IP masquerading which already does things > like this when rewriting packets. Also read the RFC material on the danger of relative checksum updates. There are a couple of interesting gotcha's with some stacks
