netdev - Re: [PATCH iproute2-next] ip-xfrm: Add support for OUTPUT

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Date:   Tue, 12 Jun 2018 11:33:41 +0900
From:   Lorenzo Colitti <lorenzo@...gle.com>
To:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Cc:     netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>,
        David Ahern <dsahern@...il.com>,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH iproute2-next] ip-xfrm: Add support for OUTPUT_MARK

On Tue, Jun 12, 2018 at 11:12 AM Subash Abhinov Kasiviswanathan
<subashab@...eaurora.org> wrote:
>
> This patch adds support for OUTPUT_MARK in xfrm state to exercise the
> functionality added by kernel commit 077fbac405bf
> ("net: xfrm: support setting an output mark.").
>
> Sample output with output-mark -
>
> src 192.168.1.1 dst 192.168.1.2
>         proto esp spi 0x00004321 reqid 0 mode tunnel
>         replay-window 0 flag af-unspec
>         auth-trunc xcbc(aes) 0x3ed0af408cf5dcbf5d5d9a5fa806b211 96
>         enc cbc(aes) 0x3ed0af408cf5dcbf5d5d9a5fa806b233
>         anti-replay context: seq 0x0, oseq 0x0, bitmap 0x00000000
>         output-mark 0x20000

Have you considered putting this earlier up in the output, where the
mark is printed as well?

> +       if (tb[XFRMA_OUTPUT_MARK]) {
> +               __u32 output_mark = rta_getattr_u32(tb[XFRMA_OUTPUT_MARK]);
> +
> +               fprintf(fp, "\toutput-mark 0x%x %s", output_mark, _SL_);
> +       }
>  }

If you wanted to implement the suggestion above, I think you could do
that by moving this code into xfrm_xfrma_print.

Other than that, LGTM.

Acked-by: Lorenzo Colitti <lorenzo@...gle.com>

Steffen - what's the status of the set_mark patches? Are you holding
them until the tree opens again? If so, then once they go in, we can
just make "set-mark" behave the same as "output-mark" in the iproute2
code, and add support for the mask as well.