From patchwork Thu Jul 4 08:59:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geliang Tang X-Patchwork-Id: 810533 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 C8D05147C74; Thu, 4 Jul 2024 09:00:11 +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=1720083611; cv=none; b=YqVdXYEYAgjul+gMoZ47vMM3gbqHZCCO56UU/VqjVoprqUqmmL+EnZ6xyJiy0zh7JDhFSUCIvGKssE5HWnLx3JQAXz0qt2okL5cezH1D1Bu2p4yzt3bG+ozviKatJ0F/E0zaF8atU4jtXo7sZY7+l0IDOVMuSrgtT3uRx0vmb+I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720083611; c=relaxed/simple; bh=bAX1OLxg4DkksZvjRAzn/L1GhmwINGXrUi0DgLiNpt4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=F2HbDnzkMJn3PePk76I03EkKiXLFTjR0O8Yuk3B/CxB+JVm0IdUvjahmenoATbhgzXNw+oNsuzAzxznX5uFfcHqef1W2cQoLTu49dKyqPh2GIvdu1m5DrR9nr65F5CqkeLlavkKQYIl0vdcEUNF0kxydFM9lJjPmN3z4Q/pjnPM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RToQcFT1; 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="RToQcFT1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22760C3277B; Thu, 4 Jul 2024 09:00:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720083611; bh=bAX1OLxg4DkksZvjRAzn/L1GhmwINGXrUi0DgLiNpt4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RToQcFT1BfLF3rVfX+ixOZwKtwZtysgJQmP0KmvPIHFlWX/joosRmRm69MLu4lbh6 PlE+LJjec7q7CpVVYmmi/1hwWZT/8zqaJfZesMt3Zu9noBK+pYgVmxcuKT7dlXCJ0x 87B9tEkMJ8d3E/UmX1r564dEmYpbYOaI2VVGruZoFmtO3tmB8f9ysd/sOcAPKbQVHt cJFGxeUr2NN+WsZEbfnNtevtSU7dPJyt0IMO9rdzC0bq8WX7eTwXR2PkO9Sw8WkqYj fuO6Hzad/9lOT2/+rXwMn7ZXdWpg+sAlbNNR227C2L+FjnBbEOnDafjOcyVahMvCyS WLs2v7J5AA2jg== 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 v7 1/9] selftests/bpf: Add backlog for network_helper_opts Date: Thu, 4 Jul 2024 16:59:38 +0800 Message-ID: <0ec29609fa37917abf0746d45458eef45d35c3d6.1720083019.git.tanggeliang@kylinos.cn> 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; };