Release bpftool v6.8 · libbpf/bpftool

New features

Implement bpftool gen min_core_btf to generate the minimal BTF file necessary to load a program
Add C++-specific skeleton wrappers
Restore support for probing BPF features on hardware (such as Netronome SmartNICs)
Add bpf_cookie to bpftool link output
Add support for generating sub-skeletons for “incomplete” BPF object files
Defaults to sysfs vmlinux when dumping BTF objects and no base BTF was specified
Extend skeletons for LSM programs to create links
Add name for trace_kprobe_multi attach type
Add name for syscall program types
Add names for xdp, perf_event, kprobe_multi link types
Add distinction, for feature probes, between reversible or permanent disabling of bpf() syscall for unprivileged users
Handle better the probing of BPF helpers for programs types that are not available
Assert type sizes in BPF skeletons
Expand autogeneration warnings in skeletons by mentioning bpftool

Fix error when looking up for keys in map with no associated BTF information
Fix pretty-print dump for maps with no associated BTF information
Fix formatting of bytes_memlock for JSON map listing
Show process PIDs for BPF maps even if there is no associated BTF id or the map is frozen
Add the description of missing commands in the top-level bpftool.8 man page
Handle libbpf_probe_prog_type() and libbpf_probe_bpf_helper() errors correctly in feature probing

Switch to libbpf's API to lift the rlimit restriction, on legacy systems without memcg-based memory accounting for BPF
Replace the use of libc's reallocarray() with the implementation from libbpf
Remove redundant slashes in Makefile

Some features requiring the use of “skeletons” (feature-clang-bpf-co-re compilation option) require kernel 5.15 or more recent, with CONFIG_PERF_EVENTS set, to compile bpftool (#17).

Full Changelog: v6.7.0...v6.8.0