From patchwork Fri Jul 5 02:58:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geliang Tang X-Patchwork-Id: 811042 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1DDE81C693; Fri, 5 Jul 2024 02:58:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720148331; cv=none; b=MJtceDrQxAIDna02ANxIC33FflzSqonX4ceBJjh5XzBheFS+Aq/r6K6Y03mptObxp3nalzYIKbAKLI0A3na0yws8wyW6wzJlAzMkSXJUKEUq9uESrPwYukmTOWOOORzIwNCiLoniQQ4FeCuOsRmfEZyx+wi9cByJot3tFSoCE5c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720148331; c=relaxed/simple; bh=bAX1OLxg4DkksZvjRAzn/L1GhmwINGXrUi0DgLiNpt4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kGUTo69HOz0eAprp87Db4P9lsrmsuz9kBuEGtMC297QX3duMZWhOzeLopDH/XCFIAic2v4GcGb3kQgNbr12DCLETYP/8mJU2+DuEDuSg2FGp8rPjcYQermhUC929yjUo+XI6QTG3zcoVzCesCxGjxQXhpOotgtUFK7CAt11w8dM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=us8zZ8TL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="us8zZ8TL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BDE90C4AF0D; Fri, 5 Jul 2024 02:58:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720148330; bh=bAX1OLxg4DkksZvjRAzn/L1GhmwINGXrUi0DgLiNpt4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=us8zZ8TL6HY58PbFV2b4kKvqeofS9BDLqTUALIpmnkmDJ8IAbUjUDIg0xjQlbayZI xGTQ2Fm6BIOHs6Zk/lznk7jhMBhOFkW7fJzUHOiSfBGzHDhes8+v1k9spoRSHubUOL r6f/C44JWHVetoAeMVaPyqLS2kpbU9HL1V8gOc9LZejxeKEcXMAglNhk0wX1PxhLHm B1YOCChqfCk57nc4eBKWkn5U/7EafGlfWJZ1WSisl4zmo244f7gfWADbw1aAORLwgn 6nblum7YtWyDC+Pj2F2WrLX77DnZIayK5e4y7ADOtPKmKIhtRR7/ElzTuVmrVmdlh5 dQk4ShznAb6og== From: Geliang Tang To: Andrii Nakryiko , Eduard Zingerman , Mykola Lysenko , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan Cc: Geliang Tang , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v8 1/9] selftests/bpf: Add backlog for network_helper_opts Date: Fri, 5 Jul 2024 10:58:23 +0800 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Geliang Tang Some callers expect __start_server() helper to pass their own "backlog" value to listen() instead of the default of 1. So this patch adds struct member "backlog" for network_helper_opts to allow callers to set "backlog" value via start_server_str() helper. listen(fd, 0 /* backlog */) can be used to enforce syncookie. Meaning backlog 0 is a legit value. Using 0 as a default and changing it to 1 here is fine. It makes the test program easier to write for the common case. Enforcing syncookie mode by using backlog 0 is a niche use case but it should at least have a way for the caller to do that. Signed-off-by: Geliang Tang --- tools/testing/selftests/bpf/network_helpers.c | 2 +- tools/testing/selftests/bpf/network_helpers.h | 4 ++++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c index 44c2c8fa542a..e0cba4178e41 100644 --- a/tools/testing/selftests/bpf/network_helpers.c +++ b/tools/testing/selftests/bpf/network_helpers.c @@ -106,7 +106,7 @@ static int __start_server(int type, const struct sockaddr *addr, socklen_t addrl } if (type == SOCK_STREAM) { - if (listen(fd, 1) < 0) { + if (listen(fd, opts->backlog ? MAX(opts->backlog, 0) : 1) < 0) { log_err("Failed to listed on socket"); goto error_close; } diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h index 9ea36524b9db..4f26bfc2dbf5 100644 --- a/tools/testing/selftests/bpf/network_helpers.h +++ b/tools/testing/selftests/bpf/network_helpers.h @@ -25,6 +25,10 @@ struct network_helper_opts { int timeout_ms; bool must_fail; int proto; + /* The backlog argument for listen(), defines the maximum length to which + * the queue of pending connections for sockfd may grow. + */ + int backlog; int (*post_socket_cb)(int fd, void *opts); void *cb_opts; };