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[95.232.75.128]) by smtp.gmail.com with ESMTPSA id kb12sm8562185ejc.35.2021.07.13.11.33.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 Jul 2021 11:33:05 -0700 (PDT) To: bpf@vger.kernel.org Subject: [PATCH bpf-next 1/2] tools/lib/bpf: bpf_program__insns allow to retrieve insns in libbpf Cc: ast@kernel.org, daniel@iogearbox.net From: Lorenzo Fontana Message-ID: Date: Tue, 13 Jul 2021 20:33:04 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This allows consumers of libbpf to iterate trough the insns of a program without loading it first directly after the ELF parsing. Being able to do that is useful to create tooling that can show the structure of a BPF program using libbpf without having to parse the ELF separately. Usage: struct bpf_insn *insn; insn = bpf_program__insns(prog); Signed-off-by: Lorenzo Fontana --- tools/lib/bpf/libbpf.c | 5 +++++ tools/lib/bpf/libbpf.h | 1 + 2 files changed, 6 insertions(+) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 1e04ce724240..67d51531f6b6 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -8866,6 +8866,11 @@ void *bpf_program__priv(const struct bpf_program *prog) return prog ? prog->priv : libbpf_err_ptr(-EINVAL); } +struct bpf_insn *bpf_program__insns(const struct bpf_program *prog) +{ + return prog ? prog->insns : libbpf_err_ptr(-EINVAL); +} + void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex) { prog->prog_ifindex = ifindex; diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 6e61342ba56c..e4a1c98ae6d9 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -195,6 +195,7 @@ typedef void (*bpf_program_clear_priv_t)(struct bpf_program *, void *); LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv, bpf_program_clear_priv_t clear_priv); +LIBBPF_API struct bpf_insn *bpf_program__insns(const struct bpf_program *prog); LIBBPF_API void *bpf_program__priv(const struct bpf_program *prog); LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex); -- 2.32.0