A simple program to list all bpf programs of a system.

[root@arch-fb-vm1 bcc]# ./build/introspection/bps -h
BPF Program Snapshot (bps):
List of all BPF programs loaded into the system.

Usage: bps [bpf-prog-id]
    [bpf-prog-id] If specified, it shows the details info of the bpf-prog

* List all bpf programs *
[root@arch-fb-vm1 bcc]# ./build/introspection/bps
      BID TYPE                 UID  #MAPS LoadTime     NAME
       82 kprobe                 0      1 Oct19/23:52  map_perf_test
       83 kprobe                 0      1 Oct19/23:52  map_perf_test
       84 kprobe                 0      1 Oct19/23:52  map_perf_test
       85 kprobe                 0      1 Oct19/23:52  map_perf_test
       86 kprobe                 0      4 Oct19/23:52  map_perf_test
       87 kprobe                 0      1 Oct19/23:52  map_perf_test
       88 kprobe                 0      1 Oct19/23:52  map_perf_test
       89 kprobe                 0      1 Oct19/23:52  map_perf_test

* List a particular bpf program *
[root@arch-fb-vm1 bcc]# ./build/introspection/bps 86
      BID TYPE                 UID  #MAPS LoadTime     NAME
       86 kprobe                 0      4 Oct19/23:52  map_perf_test

     MID TYPE            FLAGS         KeySz  ValueSz  MaxEnts NAME
     120 lru hash        0x0               4        8    10000 lru_hash_map
     129 lru hash        0x0               4        8       43 lru_hash_lookup
     123 array of maps   0x0               4        4     1024 array_of_lru_ha
     121 lru hash        0x2               4        8    10000 nocommon_lru_ha

* JIT disabled *
[root@arch-fb-vm1 bpf]# sysctl -w net.core.bpf_jit_enable=0
[root@arch-fb-vm1 bpf]# ./test_progs
[root@arch-fb-vm1 bcc]# ./build/introspection/bps
      BID TYPE                 UID  #MAPS LoadTime     NAME
      94- socket filter          0      1 Oct19/23:55  test_obj_id
      95- socket filter          0      1 Oct19/23:55  test_obj_id

* Run without CAP_SYS_ADMIN *
[kafai@arch-fb-vm1 ~]$ ./bps 1
Require CAP_SYS_ADMIN capability.  Please retry as root

* Older kernel *
[root@arch-fb-vm2 build]# uname -r
4.12.14
[root@arch-fb-vm2 build]# ./introspection/bps 1
Kernel does not support BPF introspection
Signed-off-by: Martin KaFai Lau <kafai@fb.com>