Re: LINKTYPE_LINUX_SLL2 implementation (libpcap & tcpdump)

[Guy Harris <gharris () sonic net>]

(Re-sending, from my real e-mail address rather than my forwarding-for-life e-mail address, because the latter had 
issues and required moderation.)

On Jul 10, 2018, at 9:34 AM, Petr Vorel <pvorel () suse cz> wrote:

> I'm playing with implementing LINKTYPE_LINUX_SLL2 [1] as a part of [3]
> in libpcap and using it in tcpdump.

This requires a numerical value to be assigned to LINKTYPE_LINUX_SLL2 and DLT_LINUX_SLL2; no such value has yet been 
assigned.

> 1) Keeping LINKTYPE_LINUX_SLL [2] altogether with LINKTYPE_LINUX_SLL2, compile
> both (having one of them as default for linux, second allow to use with -y switch
> in tcpdump).
> 2) Keeping LINKTYPE_LINUX_SLL [2] altogether with LINKTYPE_LINUX_SLL2 but
> compile only one of them (allow to chose via --with-pcap).
> 3) Replace LINKTYPE_LINUX_SLL with LINKTYPE_LINUX_SLL2.
>
> I've got somehow working 3), but some tcpdump tests are failing and I guess
> that's not what would be accepted due backwards compatibility.
> I guess 1) is what is wanted,

Yes.

It allows somebody to produce a capture file that can be read by software that doesn't yet support SLL2.
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