netdev - Re: [PATCH bpf-next v2 15/20] bpf: support variable length array in tracing programs

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Message-ID: <CAEf4BzZyuiei1SxU0snvZLuKJZpOLvDrqJEidVy=BFY9wcZJZg@mail.gmail.com>
Date:   Wed, 6 May 2020 10:40:11 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next v2 15/20] bpf: support variable length array in
 tracing programs

On Sun, May 3, 2020 at 11:27 PM Yonghong Song <yhs@...com> wrote:
>
> In /proc/net/ipv6_route, we have
>   struct fib6_info {
>     struct fib6_table *fib6_table;
>     ...
>     struct fib6_nh fib6_nh[0];
>   }
>   struct fib6_nh {
>     struct fib_nh_common nh_common;
>     struct rt6_info **rt6i_pcpu;
>     struct rt6_exception_bucket *rt6i_exception_bucket;
>   };
>   struct fib_nh_common {
>     ...
>     u8 nhc_gw_family;
>     ...
>   }
>
> The access:
>   struct fib6_nh *fib6_nh = &rt->fib6_nh;
>   ... fib6_nh->nh_common.nhc_gw_family ...
>
> This patch ensures such an access is handled properly.
>
> Signed-off-by: Yonghong Song <yhs@...com>
> ---

LGTM.

Acked-by: Andrii Nakryiko <andriin@...com>

>  kernel/bpf/btf.c | 37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>

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