Comments (3)
jschwinger233
commented on May 26, 2024
2
Not for now.
This is because currently we specify DLT_RAW to generate cbpf insns for skb without L2 header, as explained at
pwru/internal/libpcap/compile.go
Lines 33 to 41 in 8d5ffa2
However it seems possible to make improvement for L2 skb. The rough idea is something like:
if (skb->mac_len == 0) {
data_start = skb->mac_header;
pcap_filter_l2(data_start, data_end);
} else {
data_start = skb->network_header;
pcap_filter_l3(data_start, data_end);
}We can compile ebpf filter insns for both situations and inject them into pcap_filter_l2 and pcap_filter_l3 correspondingly.
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llhhbc
commented on May 26, 2024
@jschwinger233 Can this will be merged to master?
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llhhbc
commented on May 26, 2024
Thanks very much.
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Related Issues (20)
- release.yaml: Cross compile libpcap.a for arm64
- Update vendored cilium/ebpf
- Use clang for libpcap and CGO compilation HOT 5
- gh/workflows: Automatically update LVH VM images
- Add XDP support HOT 14
- Failed to inject filter ebpf for kprobe_skb_2: register r8 used twice HOT 11
- CI: use pwru built by "make release" when testing
- Trace skb with fragments. HOT 1
- Multi-arch container image HOT 3
- Would be nice if probe unloading was faster HOT 6
- Failing to load on bpf-next: calipso_skbuff_delattr: opening perf event: cannot assign requested address HOT 7
- option --filter-trace-tc not support HOT 2
- `cb[]` (array of values) is not printed correctly when dumping the full skb HOT 4
- Support --filter-mark mark/[/mask]
- Processes name stop displaying after some time HOT 6
- build error of "LoadKProbeMultiPWRUWithoutOutputSKB" and so on
- Track kfunc with parameter whose type is struct sock * HOT 3
- --filter-trace-tc option doesn't work with Cilium HOT 4
- Support for Openshift 4.12/13? HOT 1
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