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bpftool: Support sysctl hook

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Add support for recently added BPF_PROG_TYPE_CGROUP_SYSCTL program type
and BPF_CGROUP_SYSCTL attach type.

Example of bpftool output with sysctl program from selftests:

  # bpftool p load ./test_sysctl_prog.o /mnt/bpf/sysctl_prog type cgroup/sysctl
  # bpftool p l
  9: cgroup_sysctl  name sysctl_tcp_mem  tag 0dd05f81a8d0d52e  gpl
          loaded_at 2019-04-16T12:57:27-0700  uid 0
          xlated 1008B  jited 623B  memlock 4096B
  # bpftool c a /mnt/cgroup2/bla sysctl id 9
  # bpftool c t
  CgroupPath
  ID       AttachType      AttachFlags     Name
  /mnt/cgroup2/bla
      9        sysctl                          sysctl_tcp_mem
  # bpftool c d /mnt/cgroup2/bla sysctl id 9
  # bpftool c t
  CgroupPath
  ID       AttachType      AttachFlags     Name

Signed-off-by: Andrey Ignatov <rdna@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrey Ignatov
2019-04-16 13:13:47 -07:00
committed by Alexei Starovoitov
parent e1d1dc4653
commit f25377ee4f
6 changed files with 13 additions and 8 deletions
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3
tools/bpf/bpftool/Documentation/bpftool-prog.rst
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@@ -39,7 +39,8 @@ PROG COMMANDS
| **cgroup/sock** | **cgroup/dev** | **lwt_in** | **lwt_out** | **lwt_xmit** |
| **lwt_seg6local** | **sockops** | **sk_skb** | **sk_msg** | **lirc_mode2** |
| **cgroup/bind4** | **cgroup/bind6** | **cgroup/post_bind4** | **cgroup/post_bind6** |
| **cgroup/connect4** | **cgroup/connect6** | **cgroup/sendmsg4** | **cgroup/sendmsg6**
| **cgroup/connect4** | **cgroup/connect6** | **cgroup/sendmsg4** | **cgroup/sendmsg6** |
| **cgroup/sysctl**
| }
| *ATTACH_TYPE* := {
| **msg_verdict** | **stream_verdict** | **stream_parser** | **flow_dissector**