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737d0646a8
Add high-level API wrappers for most common and typical BPF map operations that works directly on instances of struct bpf_map * (so you don't have to call bpf_map__fd()) and validate key/value size expectations. These helpers require users to specify key (and value, where appropriate) sizes when performing lookup/update/delete/etc. This forces user to actually think and validate (for themselves) those. This is a good thing as user is expected by kernel to implicitly provide correct key/value buffer sizes and kernel will just read/write necessary amount of data. If it so happens that user doesn't set up buffers correctly (which bit people for per-CPU maps especially) kernel either randomly overwrites stack data or return -EFAULT, depending on user's luck and circumstances. These high-level APIs are meant to prevent such unpleasant and hard to debug bugs. This patch also adds bpf_map_delete_elem_flags() low-level API and requires passing flags to bpf_map__delete_elem() API for consistency across all similar APIs, even though currently kernel doesn't expect any extra flags for BPF_MAP_DELETE_ELEM operation. List of map operations that get these high-level APIs: - bpf_map_lookup_elem; - bpf_map_update_elem; - bpf_map_delete_elem; - bpf_map_lookup_and_delete_elem; - bpf_map_get_next_key. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20220512220713.2617964-1-andrii@kernel.org |
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| .. | ||
| .gitignore | ||
| bpf.c | ||
| bpf.h | ||
| bpf_core_read.h | ||
| bpf_endian.h | ||
| bpf_gen_internal.h | ||
| bpf_helpers.h | ||
| bpf_prog_linfo.c | ||
| bpf_tracing.h | ||
| btf.c | ||
| btf.h | ||
| btf_dump.c | ||
| Build | ||
| gen_loader.c | ||
| hashmap.c | ||
| hashmap.h | ||
| libbpf.c | ||
| libbpf.h | ||
| libbpf.map | ||
| libbpf.pc.template | ||
| libbpf_common.h | ||
| libbpf_errno.c | ||
| libbpf_internal.h | ||
| libbpf_legacy.h | ||
| libbpf_probes.c | ||
| libbpf_version.h | ||
| linker.c | ||
| Makefile | ||
| netlink.c | ||
| nlattr.c | ||
| nlattr.h | ||
| relo_core.c | ||
| relo_core.h | ||
| ringbuf.c | ||
| skel_internal.h | ||
| str_error.c | ||
| str_error.h | ||
| strset.c | ||
| strset.h | ||
| usdt.bpf.h | ||
| usdt.c | ||
| xsk.c | ||
| xsk.h | ||