libbpf/libbpf v0.1.0

libbpf v0.1.0

on GitHub

New features/APIs:

• __ksym extern variables support for getting kernel symbol addresses;
• BPF XDP link support;
• bpf_program__set_autoload() to disable loading and verifying specific BPF programs;
• support for attaching map elements BPF iterator programs;
• new getters/setters for more control over BPF map definitions;
• all destructor-like APIs (e.g., perf_buffer__free() and bpf_object__close()) now accept pointers returned on error (in addition to NULL and valid pointers) and ignore them, no need to guard destructors with extra checks now;
• bpf_link__detach() for force-detaching link, while it's still alive;
• btf__parse_raw() and btf__parse() APIs for more convenient and flexible BTF parsing.

New BPF program types supported:

• cgroup/sock_release (BPF_CGROUP_INET_SOCK_RELEASE);
• cgroup/sock_create is an alias for cgroup/sock now;
• xdp_cpumap;
• sk_lookup.

BPF-side APIs:

• most BPF helpers now return long for better code generation;
• bpf_endian.h now can be included along the vmlinux.h;
• bpf_get_task_stack();
• bpf_skc_to_tcp6_sock(), bpf_skc_to_udp6_sock();
• bpf_skc_to_{tcp, tcp_timewait, tcp_request}_sock();
• PT_REGS macros fixes for MIPS architecture.

Bug fixes:

• CO-RE relocations in .text section (in sub-programs) are now performed properly;
• vmlinux BTF is not loaded unnecessarily twice;
• perf_buffer__new() can be used on old kernels down to at least 4.9 version;
• libbpf's internal hashmap fixes for 32-bit architectures;
• few BTF sanitization bugs and memory leaks fixed;
• btf_dump handling of GCC built-in types for Arm NEON fixed;
• BTF-defined map-in-map initialization fixed for 32-bit architectures;
• various BTF fixes for 32-bit architectures.