From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) (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 34E691FAA for ; Fri, 29 Apr 2022 23:22:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1651274533; x=1682810533; h=date:from:to:cc:subject:in-reply-to:message-id: references:mime-version; bh=WTQ1fGIlb3aCh6XinqdNPUBC60QYJ9Id7TJsIdo7UkA=; b=X+cqhTQN5JecP9DULz26JUwy0taPTTWhhJt/LBoa00zc/uLlb9YvRnWX HQm6R1uDZIM8tY4c32uYIYa/xzPJJpV9OWIH6/PXugY/2liqhcMv61G9m FrEjakFcADDPHSqgcNf155Rzlxc4luJA13GOufuo2a2cJpIYumvRsYocF C649y7iQEIZSxgFkzMitaj9CIWynw1eRiWL07rBUmLpiy/nKNmR3GJ+an b1ewtdjGdpT53nVgUdxLMwxAGdP0EvYALA6ppr/luRjMfVE8tS3+STjQO m+R5kxL/5I73guFHmm/BhHyWwL2k2NYIuApuYFD1HAq5Qm/iLj6yXoG6l Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10332"; a="247352675" X-IronPort-AV: E=Sophos;i="5.91,186,1647327600"; d="scan'208";a="247352675" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2022 16:22:12 -0700 X-IronPort-AV: E=Sophos;i="5.91,186,1647327600"; d="scan'208";a="560621871" Received: from mdbellow-mobl.amr.corp.intel.com ([10.209.122.4]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2022 16:22:11 -0700 Date: Fri, 29 Apr 2022 16:22:11 -0700 (PDT) From: Mat Martineau To: Geliang Tang , netdev@vger.kernel.org, bpf@vger.kernel.org cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, mptcp@lists.linux.dev, Matthieu Baerts Subject: Re: [PATCH bpf-next v2 7/8] selftests: bpf: verify ca_name of struct mptcp_sock In-Reply-To: <20220429220204.353225-8-mathew.j.martineau@linux.intel.com> Message-ID: <6cb5d7dc-1162-1bd1-452-a11089b018a3@linux.intel.com> References: <20220429220204.353225-1-mathew.j.martineau@linux.intel.com> <20220429220204.353225-8-mathew.j.martineau@linux.intel.com> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed On Fri, 29 Apr 2022, Mat Martineau wrote: > 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"); The BPF CI is failing because it uses busybox for the sysctl command, which doesn't support all the command line parameters that procps-ng sysctl does: https://github.com/kernel-patches/bpf/runs/6235741017?check_suite_focus=true#step:6:4259 Geliang, can you update this self test to instead read the default congestion control string from /proc/sys/net/ipv4/tcp_congestion_control? Thanks, Mat > + > + 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; > -- > 2.36.0 > > -- Mat Martineau Intel