Fix broken --filter-trace-xdp caused by go-ebpf v0.17.1 #484
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This was referenced Jan 17, 2025
ti-mo
reviewed
Jan 22, 2025
There're two issue: One is `BPF_PROG_ADDR` must be set via `spec.Variable`. Another one is `.bss` map flag must be updated because go-ebpf v0.17.1 set `BPF_F_MMAPABLE` flag to created `.bss` map. As a result, we can reuse `.bss` map. Here's the test result: ```bash $ sudo ./pwru --filter-trace-tc --filter-trace-xdp --filter-func '.*icmp.*' icmp 2025/01/15 15:14:26 Attaching tc-bpf progs... 2025/01/15 15:14:26 Attaching xdp progs... 2025/01/15 15:14:26 Attaching kprobes (via kprobe)... 29 / 29 [--------------------------------------------------------------------------------------------------------------------------------------] 100.00% ? p/s 2025/01/15 15:14:26 Attached (ignored 0) 2025/01/15 15:14:26 Listening for events.. SKB CPU PROCESS NETNS MARK/x IFACE PROTO MTU LEN __sk_buff->cb[] TUPLE FUNC 0xffffb5dd40600b00 6 <empty>:0 4026531840 0 ens33:2 0x0000 1500 98 [0x00000000,0x00000000,0x00000000,0x00000000,0x00000000] 192.168.241.1:0->192.168.241.133:0(icmp) bpf_prog_3b185187f1855c4c_dummy[bpf](xdp) 0xffff995b7756d400 6 <empty>:0 4026531840 0 ens33:2 0x0800 1500 98 [0x00000000,0x00000000,0x00000000,0x00000000,0x00000000] 192.168.241.1:0->192.168.241.133:0(icmp) bpf_prog_e20a685998fd41c8_entry1[bpf](tc) 0xffff995b7756d400 6 <empty>:0 4026531840 0 ens33:2 0x0800 65536 64 [0x00000000,0x00000000,0x00000000,0x00000000,0x00000000] 192.168.241.1:0->192.168.241.133:0(icmp) icmp_rcv 0xffff995b7756d400 6 <empty>:0 4026531840 0 ens33:2 0x0800 65536 56 [0x00000000,0x00000000,0x00000000,0x00000000,0x00000000] 192.168.241.1:0->192.168.241.133:0(icmp) icmp_echo 0xffff995b7756d400 6 <empty>:0 4026531840 0 ens33:2 0x0800 65536 56 [0x00000000,0x00000000,0x00000000,0x00000000,0x00000000] 192.168.241.1:0->192.168.241.133:0(icmp) icmp_reply ^C2025/01/15 15:14:30 Received signal, exiting program.. 2025/01/15 15:14:30 Detaching kprobes... 29 / 29 [------------------------------------------------------------------------------------------------------------------------------------] 100.00% 132 p/s ``` And there's only one `.bss` map: ```bash $ sudo bpftool m | grep -c .bss 1 ``` Signed-off-by: Leon Hwang <hffilwlqm@gmail.com>
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Fixes #483
There're two issue:
One is
BPF_PROG_ADDRmust be set viaspec.Variable.Another one is
.bssmap flag must be updated because go-ebpf v0.17.1 setBPF_F_MMAPABLEflag to created.bssmap. As a result, we can reuse.bssmap.Here's the test result:
And there's only one
.bssmap:# bpftool m | grep -c .bss 1