contrib/bpf_inspect.py: abstract bpf classes #406
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In order to inspect more and more info of bpf objects, this commit abstracts classes, such as `BpfProg`, `BpfMap`, `BpfLink` and so on. Signed-off-by: Leon Hwang <[email protected]>
Show "tail_call_reachable" if bpf prog is tail_call_reachable. Signed-off-by: Leon Hwang <[email protected]>
When a link is XDP link, show ifname, ifindex and XDP mode, if --show-details. Signed-off-by: Leon Hwang <[email protected]>
When run drgn on kernel v5.5~5.9, there is no `dst_trampoline` in `prog-> aux`. At this time, `tr` must be inited as `None` in order to avoid panic when get `trampoline` from `prog->aux`. Signed-off-by: Leon Hwang <[email protected]>
Currently, inspect details for PROG_ARRAY map. For instance: ```bash drgn ./contrib/bpf_inspect.py m --show-details 5108: BPF_MAP_TYPE_PROG_ARRAY prog_array owner: BPF_PROG_TYPE_KPROBE JITed idx[ 0]: 4250: BPF_PROG_TYPE_KPROBE k_tailcall poke: 4249: BPF_PROG_TYPE_KPROBE k_icsk_complete_hashdance tail_call_reachable poke: 4251: BPF_PROG_TYPE_KPROBE k_tcp_connect tail_call_reachable ``` Signed-off-by: Leon Hwang <[email protected]>
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Abstract bpf classes and do some enhancement.
I've test it on 6.8 and 5.15 kernels.
Here's the enhanced result:
$ sudo drgn ./contrib/bpf_inspect.py p 2: BPF_PROG_TYPE_TRACING hid_tail_call 2295: BPF_PROG_TYPE_EXT entry tail_call_reachable 2400: BPF_PROG_TYPE_EXT entry tail_call_reachable $ sudo drgn ./contrib/bpf_inspect.py m --show-details 5108: BPF_MAP_TYPE_PROG_ARRAY prog_array owner: BPF_PROG_TYPE_KPROBE JITed idx[ 0]: 4250: BPF_PROG_TYPE_KPROBE k_tailcall poke: 4249: BPF_PROG_TYPE_KPROBE k_icsk_complete_hashdance tail_call_reachable poke: 4251: BPF_PROG_TYPE_KPROBE k_tcp_connect tail_call_reachable $ sudo drgn ./contrib/bpf_inspect.py l --show-details 1: BPF_LINK_TYPE_TRACING prog: 2: BPF_PROG_TYPE_TRACING hid_tail_call attach: __hid_bpf_tail_call 1211: BPF_LINK_TYPE_TRACING prog: 4239: BPF_PROG_TYPE_TRACING fentry_tc attach: entry1 target: 4235: BPF_PROG_TYPE_SCHED_CLS entry1 1212: BPF_LINK_TYPE_TRACING prog: 4240: BPF_PROG_TYPE_TRACING fexit_tc attach: entry1 target: 4235: BPF_PROG_TYPE_SCHED_CLS entry1 1217: BPF_LINK_TYPE_TRACING prog: 4252: BPF_PROG_TYPE_TRACING fentry_freplace_handler attach: stub_handler target: 4251: BPF_PROG_TYPE_KPROBE k_tcp_connect tail_call_reachable 1218: BPF_LINK_TYPE_TRACING prog: 4253: BPF_PROG_TYPE_TRACING fexit_freplace_handler attach: stub_handler target: 4251: BPF_PROG_TYPE_KPROBE k_tcp_connect tail_call_reachable 1219: BPF_LINK_TYPE_PERF_EVENT prog: 4251: BPF_PROG_TYPE_KPROBE k_tcp_connect tail_call_reachable 1220: BPF_LINK_TYPE_PERF_EVENT prog: 4249: BPF_PROG_TYPE_KPROBE k_icsk_complete_hashdance tail_call_reachable