netdev - Re: [PATCH bpf-next v9 09/10] bpftool: implement cgroup tree for BPF_LSM

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Date:   Mon, 13 Jun 2022 08:53:44 -0700
From:   Stanislav Fomichev <sdf@...gle.com>
To:     Quentin Monnet <quentin@...valent.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org
Subject: Re: [PATCH bpf-next v9 09/10] bpftool: implement cgroup tree for BPF_LSM_CGROUP

On Mon, Jun 13, 2022 at 5:08 AM Quentin Monnet <quentin@...valent.com> wrote:
>
> 2022-06-10 09:58 UTC-0700 ~ Stanislav Fomichev <sdf@...gle.com>
> > $ bpftool --nomount prog loadall $KDIR/tools/testing/selftests/bpf/lsm_cgroup.o /sys/fs/bpf/x
> > $ bpftool cgroup attach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_alloc
> > $ bpftool cgroup attach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_bind
> > $ bpftool cgroup attach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_clone
> > $ bpftool cgroup attach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_post_create
> > $ bpftool cgroup tree
> > CgroupPath
> > ID       AttachType      AttachFlags     Name
> > /sys/fs/cgroup
> > 6        lsm_cgroup                      socket_post_create bpf_lsm_socket_post_create
> > 8        lsm_cgroup                      socket_bind     bpf_lsm_socket_bind
> > 10       lsm_cgroup                      socket_alloc    bpf_lsm_sk_alloc_security
> > 11       lsm_cgroup                      socket_clone    bpf_lsm_inet_csk_clone
> >
> > $ bpftool cgroup detach /sys/fs/cgroup lsm_cgroup pinned /sys/fs/bpf/x/socket_post_create
> > $ bpftool cgroup tree
> > CgroupPath
> > ID       AttachType      AttachFlags     Name
> > /sys/fs/cgroup
> > 8        lsm_cgroup                      socket_bind     bpf_lsm_socket_bind
> > 10       lsm_cgroup                      socket_alloc    bpf_lsm_sk_alloc_security
> > 11       lsm_cgroup                      socket_clone    bpf_lsm_inet_csk_clone
> >
> > Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
>
> The changes for bpftool look good to me, thanks!
> Reviewed-by: Quentin Monnet <quentin@...valent.com>

Thank you for the review!

> > ---
> >  tools/bpf/bpftool/cgroup.c | 80 +++++++++++++++++++++++++++-----------
> >  1 file changed, 58 insertions(+), 22 deletions(-)
> >
> > diff --git a/tools/bpf/bpftool/cgroup.c b/tools/bpf/bpftool/cgroup.c
> > index 42421fe47a58..6e55f583a62f 100644
> > --- a/tools/bpf/bpftool/cgroup.c
> > +++ b/tools/bpf/bpftool/cgroup.c
>
> > @@ -542,5 +577,6 @@ static const struct cmd cmds[] = {
> >
> >  int do_cgroup(int argc, char **argv)
> >  {
> > +     btf_vmlinux = libbpf_find_kernel_btf();
> >       return cmd_select(cmds, argc, argv, do_help);
> >  }
>
> This is not required for all "bpftool cgroup" operations (attach/detach
> don't need it I think), but should be inexpensive, right?

Good point, let's move it close to the place where we use it
regardless of whether it's expensive or not.