netdev - Re: [PATCH iproute2] ip: add support for seg6local End.BPF action

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Message-ID: <20180716074848.07fc6bca@xeon-e3>
Date:   Mon, 16 Jul 2018 07:48:48 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Mathieu Xhonneux <m.xhonneux@...il.com>
Cc:     netdev@...r.kernel.org, dsahern@...il.com, dlebrun@...gle.com
Subject: Re: [PATCH iproute2] ip: add support for seg6local End.BPF action

On Mon, 16 Jul 2018 14:47:41 +0000
Mathieu Xhonneux <m.xhonneux@...il.com> wrote:

> This patch adds support for the End.BPF action of the seg6local
> lightweight tunnel. Functions from the BPF lightweight tunnel are
> re-used in this patch. Example:
> 
> $ ip -6 route add fc00::18 encap seg6local action End.BPF obj my_bpf.o
> sec my_func dev eth0
> 
> $ ip -6 route show fc00::18
> fc00::18  encap seg6local action End.BPF my_bpf.o:[my_func] dev eth0
> metric 1024 pref medium
> 
> Signed-off-by: Mathieu Xhonneux <m.xhonneux@...il.com>

> ---
>  ip/iproute_lwtunnel.c | 122 +++++++++++++++++++++++++++++---------------------
>  lib/bpf.c             |   5 +++
>  2 files changed, 77 insertions(+), 50 deletions(-)
> 
> diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
> index 46a212c8..71c3d8a4 100644
> --- a/ip/iproute_lwtunnel.c
> +++ b/ip/iproute_lwtunnel.c
> @@ -177,6 +177,7 @@ static const char *seg6_action_names[SEG6_LOCAL_ACTION_MAX + 1] = {
>  	[SEG6_LOCAL_ACTION_END_S]		= "End.S",
>  	[SEG6_LOCAL_ACTION_END_AS]		= "End.AS",
>  	[SEG6_LOCAL_ACTION_END_AM]		= "End.AM",
> +	[SEG6_LOCAL_ACTION_END_BPF]		= "End.BPF",
>  };
>  
>  static const char *format_action_type(int action)
> @@ -250,6 +251,15 @@ static void print_encap_seg6local(FILE *fp, struct rtattr *encap)
>  		print_string(PRINT_ANY, "oif",
>  			     "oif %s ", ll_index_to_name(oif));
>  	}
> +
> +	if (tb[SEG6_LOCAL_BPF]) {
> +		struct rtattr *tb_bpf[LWT_BPF_PROG_MAX+1];
> +
> +		parse_rtattr_nested(tb_bpf, LWT_BPF_PROG_MAX, tb[SEG6_LOCAL_BPF]);
> +
> +		if (tb_bpf[LWT_BPF_PROG_NAME])
> +			fprintf(fp, "%s ", rta_getattr_str(tb_bpf[LWT_BPF_PROG_NAME]));
> +	}
>  }

Please use print_string to support JSON output.