Re: [PATCH] Change xt_TOS v1 target to zero-out semantic

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Jan Engelhardt wrote:
This patch changes the behavior of xt_TOS v1 so that the mask value
one supplies means "zero out these bits" rather than "keep these
bits". This is more easy on the user, as (I would assume) people
keep more bits than zeroing, so, an example:

	Action: Set bit 0x01.
	before: iptables -j TOS --set-tos 0x01/0xFE
	after:  iptables -j TOS --set-tos 0x01/0x01

This is not too "tragic" with xt_TOS, but where larger fields are
used (e.g. proposed xt_MARK v2), `--set-xmark 0x01/0xFFFFFFFE` vs.
`--set-xmark 0x01/0x01` is really a worthy difference.
Other modules, such as xt_TPROXY also use &~ rather than &, so
let's find a common ground.

I'm going to apply this, but only if we're going to have
an easier to use userspace extension for this.

I'd prefer:

--set-tos: set exact value, no mask
--or-tos: set single bits
--xor-tos: flip single bits
--and-tos: mask single bits
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