From patchwork Fri Apr 29 22:02:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mat Martineau X-Patchwork-Id: 12832906 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0DC0C433F5 for ; Fri, 29 Apr 2022 22:02:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1381258AbiD2WFk (ORCPT ); Fri, 29 Apr 2022 18:05:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57630 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1381241AbiD2WFd (ORCPT ); Fri, 29 Apr 2022 18:05:33 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 23B89DBD39; Fri, 29 Apr 2022 15:02:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1651269734; x=1682805734; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=aLkF5iautQtoCByDZ1EM15ok+OCMKaaRGi5jkl6MJpQ=; b=eNQAcrsOZHbj2OJsKND0an6z+MCQszW6we0BlFCUpsnMzkM21/I7Xx7K eZfmoTdVPEJR41IMrM2Qe4dsmA7uyXDwkmKrQSseeUNvPCcyaSn7uoRUC /ZwzG/wSsAlP08nI8ZE4VoiB3Bq3WtzZFtMRG1sMRbyVU8Ti/CV8aq8DF ULDBEkxV57QzG1+EK9pyAEs+ecB3d5/TB7HFysm4SzqX6fyBBbkGQf841 buwpD/tgB6qWseA1gdKsHcPMDyVYcxkRtaVdkAoi7977HBLc47np6WEgZ hKREeOp6HV3xp4RGDg1AC1v+0G9VFFCt353eq5pp6y3bNcnqJGEB3ow9T A==; X-IronPort-AV: E=McAfee;i="6400,9594,10332"; a="266609695" X-IronPort-AV: E=Sophos;i="5.91,186,1647327600"; d="scan'208";a="266609695" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2022 15:02:10 -0700 X-IronPort-AV: E=Sophos;i="5.91,186,1647327600"; d="scan'208";a="582419804" Received: from mjmartin-desk2.amr.corp.intel.com (HELO mjmartin-desk2.intel.com) ([10.212.217.201]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2022 15:02:10 -0700 From: Mat Martineau To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: Geliang Tang , ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, mptcp@lists.linux.dev, Matthieu Baerts , Mat Martineau Subject: [PATCH bpf-next v2 7/8] selftests: bpf: verify ca_name of struct mptcp_sock Date: Fri, 29 Apr 2022 15:02:03 -0700 Message-Id: <20220429220204.353225-8-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220429220204.353225-1-mathew.j.martineau@linux.intel.com> References: <20220429220204.353225-1-mathew.j.martineau@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: Geliang Tang This patch verifies another member of struct mptcp_sock, ca_name. Add a new function get_msk_ca_name() to read the sysctl tcp_congestion_control and verify it in verify_msk(). Acked-by: Matthieu Baerts Signed-off-by: Geliang Tang Signed-off-by: Mat Martineau --- .../testing/selftests/bpf/bpf_mptcp_helpers.h | 1 + tools/testing/selftests/bpf/bpf_tcp_helpers.h | 4 ++++ .../testing/selftests/bpf/prog_tests/mptcp.c | 24 +++++++++++++++++++ .../testing/selftests/bpf/progs/mptcp_sock.c | 4 ++++ 4 files changed, 33 insertions(+) diff --git a/tools/testing/selftests/bpf/bpf_mptcp_helpers.h b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h index 87e15810997d..463e4e061c96 100644 --- a/tools/testing/selftests/bpf/bpf_mptcp_helpers.h +++ b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h @@ -10,6 +10,7 @@ struct mptcp_sock { struct inet_connection_sock sk; __u32 token; + char ca_name[TCP_CA_NAME_MAX]; } __attribute__((preserve_access_index)); #endif diff --git a/tools/testing/selftests/bpf/bpf_tcp_helpers.h b/tools/testing/selftests/bpf/bpf_tcp_helpers.h index b1ede6f0b821..89750d732cfa 100644 --- a/tools/testing/selftests/bpf/bpf_tcp_helpers.h +++ b/tools/testing/selftests/bpf/bpf_tcp_helpers.h @@ -16,6 +16,10 @@ BPF_PROG(name, args) #define SOL_TCP 6 #endif +#ifndef TCP_CA_NAME_MAX +#define TCP_CA_NAME_MAX 16 +#endif + #define tcp_jiffies32 ((__u32)bpf_jiffies64()) struct sock_common { diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index c5d96ba81e04..4518aa6e661e 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -5,10 +5,15 @@ #include "cgroup_helpers.h" #include "network_helpers.h" +#ifndef TCP_CA_NAME_MAX +#define TCP_CA_NAME_MAX 16 +#endif + struct mptcp_storage { __u32 invoked; __u32 is_mptcp; __u32 token; + char ca_name[TCP_CA_NAME_MAX]; }; static char monitor_log_path[64]; @@ -79,11 +84,22 @@ static __u32 get_msk_token(void) return token; } +void get_msk_ca_name(char ca_name[]) +{ + FILE *stream = popen("sysctl -b net.ipv4.tcp_congestion_control", "r"); + + if (!fgets(ca_name, TCP_CA_NAME_MAX, stream)) + log_err("Failed to read ca_name"); + + pclose(stream); +} + static int verify_msk(int map_fd, int client_fd) { char *msg = "MPTCP subflow socket"; int err = 0, cfd = client_fd; struct mptcp_storage val; + char ca_name[TCP_CA_NAME_MAX]; __u32 token; token = get_msk_token(); @@ -92,6 +108,8 @@ static int verify_msk(int map_fd, int client_fd) return -1; } + get_msk_ca_name(ca_name); + if (CHECK_FAIL(bpf_map_lookup_elem(map_fd, &cfd, &val) < 0)) { perror("Failed to read socket storage"); return -1; @@ -115,6 +133,12 @@ static int verify_msk(int map_fd, int client_fd) err++; } + if (strncmp(val.ca_name, ca_name, TCP_CA_NAME_MAX)) { + log_err("Unexpected mptcp_sock.ca_name %s != %s", + val.ca_name, ca_name); + err++; + } + return err; } diff --git a/tools/testing/selftests/bpf/progs/mptcp_sock.c b/tools/testing/selftests/bpf/progs/mptcp_sock.c index c58c191d8416..226571673800 100644 --- a/tools/testing/selftests/bpf/progs/mptcp_sock.c +++ b/tools/testing/selftests/bpf/progs/mptcp_sock.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2020, Tessares SA. */ +#include #include #include #include "bpf_mptcp_helpers.h" @@ -13,6 +14,7 @@ struct mptcp_storage { __u32 invoked; __u32 is_mptcp; __u32 token; + char ca_name[TCP_CA_NAME_MAX]; }; struct { @@ -49,6 +51,7 @@ int _sockops(struct bpf_sock_ops *ctx) return 1; storage->token = 0; + bzero(storage->ca_name, TCP_CA_NAME_MAX); } else { if (!CONFIG_MPTCP) return 1; @@ -63,6 +66,7 @@ int _sockops(struct bpf_sock_ops *ctx) return 1; storage->token = msk->token; + memcpy(storage->ca_name, msk->ca_name, TCP_CA_NAME_MAX); } storage->invoked++; storage->is_mptcp = tcp_sk->is_mptcp;