Pass a cookie along with BPF_LINK_CREATE requests. Add a bpf_cookie field to struct bpf_tracing_link to attach a cookie. The cookie of a bpf_tracing_link is available by calling bpf_get_attach_cookie when running the BPF program of the attached link. The value of a cookie will be set at bpf_tramp_run_ctx by the trampoline of the link.
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| @@ -1490,6 +1490,15 @@ union bpf_attr { · 1489 unmodified lines | ||
| 1490 | 1490 | __aligned_u64 addrs; |
| 1491 | 1491 | __aligned_u64 cookies; |
| 1492 | 1492 | } kprobe_multi; |
| 1493 | + struct { | |
| 1494 | + /* this is overlaid with the target_btf_id above. */ | |
| 1495 | + __u32 target_btf_id; | |
| 1496 | + /* black box user-provided value passed through | |
| 1497 | + * to BPF program at the execution time and | |
| 1498 | + * accessible through bpf_get_attach_cookie() BPF helper | |
| 1499 | + */ | |
| 1500 | + __u64 cookie; | |
| 1501 | + } tracing; | |
| 1493 | 1502 | }; |
| 1494 | 1503 | } link_create; |
| 1495 | 1504 | |