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

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Date:   Mon, 13 Jun 2022 13:07:59 +0100
From:   Quentin Monnet <quentin@...valent.com>
To:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     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

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>

> ---
>  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?

Quentin