From patchwork Wed Apr 20 22:24:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mat Martineau X-Patchwork-Id: 12820857 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 E5322C4332F for ; Wed, 20 Apr 2022 22:25:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355788AbiDTW2E (ORCPT ); Wed, 20 Apr 2022 18:28:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237210AbiDTW2C (ORCPT ); Wed, 20 Apr 2022 18:28:02 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 22C13403E0; Wed, 20 Apr 2022 15:25:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1650493515; x=1682029515; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=DnWR4bk+hv6VcI7OdulN0bk+Petr2t2+O49LbWUe6JI=; b=BUYNBSE1u2zPy5wJ+X2aWdgSaxjnAtOpfj6KG0+q7GKUUTiUJKgcsY9E n9fN/RYrmjMQ94skyJlel19GZBVP66SQa+eP92I8+igB4w7ysqciltlGl yPgs7Qf9VQwTQShHhpTLyhvmLZxwfGxFycSRacCEDqiM22+eWsq/enJij U6vQakbZlrvAWrXpHnCDJuwh6U+DafxLbXnunJIbbUOUe1SREypmSiRbB oDWDDPGrKELomocTRv2vt7OkDOAmaQH+8c9ZACmxCbk7rUC+AKEviJBPd V4e4vwm+k6kI+Q4F1ooWQXVFZyeSr+FSjBByRNz/yB8ciHNvn86UMTYR1 A==; X-IronPort-AV: E=McAfee;i="6400,9594,10323"; a="289277577" X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="289277577" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:14 -0700 X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="555422582" Received: from mjmartin-desk2.amr.corp.intel.com (HELO mjmartin-desk2.intel.com) ([10.209.100.38]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:13 -0700 From: Mat Martineau To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: Nicolas Rybowski , ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, mptcp@lists.linux.dev, Matthieu Baerts , Mat Martineau Subject: [PATCH bpf-next 1/7] bpf: expose is_mptcp flag to bpf_tcp_sock Date: Wed, 20 Apr 2022 15:24:53 -0700 Message-Id: <20220420222459.307649-2-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220420222459.307649-1-mathew.j.martineau@linux.intel.com> References: <20220420222459.307649-1-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: Nicolas Rybowski is_mptcp is a field from struct tcp_sock used to indicate that the current tcp_sock is part of the MPTCP protocol. In this protocol, a first socket (mptcp_sock) is created with sk_protocol set to IPPROTO_MPTCP (=262) for control purpose but it isn't directly on the wire. This is the role of the subflow (kernel) sockets which are classical tcp_sock with sk_protocol set to IPPROTO_TCP. The only way to differentiate such sockets from plain TCP sockets is the is_mptcp field from tcp_sock. Such an exposure in BPF is thus required to be able to differentiate plain TCP sockets from MPTCP subflow sockets in BPF_PROG_TYPE_SOCK_OPS programs. The choice has been made to silently pass the case when CONFIG_MPTCP is unset by defaulting is_mptcp to 0 in order to make BPF independent of the MPTCP configuration. Another solution is to make the verifier fail in 'bpf_tcp_sock_is_valid_ctx_access' but this will add an additional '#ifdef CONFIG_MPTCP' in the BPF code and a same injected BPF program will not run if MPTCP is not set. An example use-case is provided in https://github.com/multipath-tcp/mptcp_net-next/tree/scripts/bpf/examples Suggested-by: Matthieu Baerts Acked-by: Matthieu Baerts Signed-off-by: Nicolas Rybowski Signed-off-by: Mat Martineau --- include/uapi/linux/bpf.h | 1 + net/core/filter.c | 9 ++++++++- tools/include/uapi/linux/bpf.h | 1 + 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index d14b10b85e51..9ef1f3e1c22f 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -5694,6 +5694,7 @@ struct bpf_tcp_sock { __u32 delivered; /* Total data packets delivered incl. rexmits */ __u32 delivered_ce; /* Like the above but only ECE marked packets */ __u32 icsk_retransmits; /* Number of unrecovered [RTO] timeouts */ + __u32 is_mptcp; /* Is MPTCP subflow? */ }; struct bpf_sock_tuple { diff --git a/net/core/filter.c b/net/core/filter.c index 143f442a9505..7b1867f1f422 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -6754,7 +6754,7 @@ bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, struct bpf_insn_access_aux *info) { if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, - icsk_retransmits)) + is_mptcp)) return false; if (off % size != 0) @@ -6888,6 +6888,13 @@ u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, case offsetof(struct bpf_tcp_sock, icsk_retransmits): BPF_INET_SOCK_GET_COMMON(icsk_retransmits); break; + case offsetof(struct bpf_tcp_sock, is_mptcp): +#ifdef CONFIG_MPTCP + BPF_TCP_SOCK_GET_COMMON(is_mptcp); +#else + *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); +#endif + break; } return insn - insn_buf; diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index d14b10b85e51..9ef1f3e1c22f 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -5694,6 +5694,7 @@ struct bpf_tcp_sock { __u32 delivered; /* Total data packets delivered incl. rexmits */ __u32 delivered_ce; /* Like the above but only ECE marked packets */ __u32 icsk_retransmits; /* Number of unrecovered [RTO] timeouts */ + __u32 is_mptcp; /* Is MPTCP subflow? */ }; struct bpf_sock_tuple { From patchwork Wed Apr 20 22:24:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mat Martineau X-Patchwork-Id: 12820858 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 E4089C43217 for ; Wed, 20 Apr 2022 22:25:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356132AbiDTW2G (ORCPT ); Wed, 20 Apr 2022 18:28:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34274 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355396AbiDTW2D (ORCPT ); Wed, 20 Apr 2022 18:28:03 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1BC2F40A00; Wed, 20 Apr 2022 15:25:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1650493516; x=1682029516; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7JGsPMfEIizl3uiYOkvij3X2qHRKl3rpmk92jGiEIgA=; b=lj3LOF+Grbbd4asy2dZxYczEopn1qC+NzFGx59xyFws/tSwqY9tzwCfM 9cHSK24zsEYuIKXLfPrd3c+AkidKGI1rhNY9FfFy7ekXDWWVICZIKpoTP yppA7KFZyiJK5d4kcYCuo+jAyT49A6qZE0Ywa/0xGkn38LEf/6+Pr7xJL x3Bd8bc4OrxN/AiOq1QIa4M65lNFuN+jFjsALVWcRmf2Upyv25bT7g5mt U0tpvDR0xoQipTBJ4/+5N1+70Y9Az5OGW9S9ncihVt1qfXx+kLwXd7+Ba g4OIvwWloOYKK+6s8e6CQ3Z/feK0yxKfkRtdVo91lo29L9rbDBr4VaaD5 Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10323"; a="289277585" X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="289277585" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:15 -0700 X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="555422587" Received: from mjmartin-desk2.amr.corp.intel.com (HELO mjmartin-desk2.intel.com) ([10.209.100.38]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:14 -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, Nicolas Rybowski , Matthieu Baerts , Mat Martineau Subject: [PATCH bpf-next 2/7] bpf: add bpf_skc_to_mptcp_sock_proto Date: Wed, 20 Apr 2022 15:24:54 -0700 Message-Id: <20220420222459.307649-3-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220420222459.307649-1-mathew.j.martineau@linux.intel.com> References: <20220420222459.307649-1-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 implements a new struct bpf_func_proto, named bpf_skc_to_mptcp_sock_proto. Define a new bpf_id BTF_SOCK_TYPE_MPTCP, and a new helper bpf_skc_to_mptcp_sock(), which invokes another new helper bpf_mptcp_sock_from_subflow() in net/mptcp/bpf.c to get struct mptcp_sock from a given subflow socket. Co-developed-by: Nicolas Rybowski Signed-off-by: Nicolas Rybowski Co-developed-by: Matthieu Baerts Signed-off-by: Matthieu Baerts Signed-off-by: Geliang Tang Signed-off-by: Mat Martineau --- include/linux/btf_ids.h | 3 ++- include/net/mptcp.h | 6 ++++++ include/uapi/linux/bpf.h | 7 +++++++ net/core/filter.c | 17 +++++++++++++++++ net/mptcp/Makefile | 4 ++++ net/mptcp/bpf.c | 22 ++++++++++++++++++++++ scripts/bpf_doc.py | 2 ++ tools/include/uapi/linux/bpf.h | 7 +++++++ 8 files changed, 67 insertions(+), 1 deletion(-) create mode 100644 net/mptcp/bpf.c diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h index bc5d9cc34e4c..335a19092368 100644 --- a/include/linux/btf_ids.h +++ b/include/linux/btf_ids.h @@ -178,7 +178,8 @@ extern struct btf_id_set name; BTF_SOCK_TYPE(BTF_SOCK_TYPE_TCP6, tcp6_sock) \ BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP, udp_sock) \ BTF_SOCK_TYPE(BTF_SOCK_TYPE_UDP6, udp6_sock) \ - BTF_SOCK_TYPE(BTF_SOCK_TYPE_UNIX, unix_sock) + BTF_SOCK_TYPE(BTF_SOCK_TYPE_UNIX, unix_sock) \ + BTF_SOCK_TYPE(BTF_SOCK_TYPE_MPTCP, mptcp_sock) enum { #define BTF_SOCK_TYPE(name, str) name, diff --git a/include/net/mptcp.h b/include/net/mptcp.h index 0a3b0fb04a3b..5b3a6f783182 100644 --- a/include/net/mptcp.h +++ b/include/net/mptcp.h @@ -283,4 +283,10 @@ static inline int mptcpv6_init(void) { return 0; } static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { } #endif +#if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) +struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk); +#else +static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; } +#endif + #endif /* __NET_MPTCP_H */ diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 9ef1f3e1c22f..785f2cb15495 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -5143,6 +5143,12 @@ union bpf_attr { * The **hash_algo** is returned on success, * **-EOPNOTSUP** if the hash calculation failed or **-EINVAL** if * invalid arguments are passed. + * + * struct mptcp_sock *bpf_skc_to_mptcp_sock(void *sk) + * Description + * Dynamically cast a *sk* pointer to a *mptcp_sock* pointer. + * Return + * *sk* if casting is valid, or **NULL** otherwise. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -5339,6 +5345,7 @@ union bpf_attr { FN(copy_from_user_task), \ FN(skb_set_tstamp), \ FN(ima_file_hash), \ + FN(skc_to_mptcp_sock), \ /* */ /* integer value in 'imm' field of BPF_CALL instruction selects which helper diff --git a/net/core/filter.c b/net/core/filter.c index 7b1867f1f422..4081c55f6f78 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -78,6 +78,7 @@ #include #include #include +#include static const struct bpf_func_proto * bpf_sk_base_func_proto(enum bpf_func_id func_id); @@ -11279,6 +11280,19 @@ const struct bpf_func_proto bpf_skc_to_unix_sock_proto = { .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UNIX], }; +BPF_CALL_1(bpf_skc_to_mptcp_sock, struct sock *, sk) +{ + return (unsigned long)bpf_mptcp_sock_from_subflow(sk); +} + +static const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto = { + .func = bpf_skc_to_mptcp_sock, + .gpl_only = false, + .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, + .arg1_type = ARG_PTR_TO_SOCK_COMMON, + .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_MPTCP], +}; + BPF_CALL_1(bpf_sock_from_file, struct file *, file) { return (unsigned long)sock_from_file(file); @@ -11321,6 +11335,9 @@ bpf_sk_base_func_proto(enum bpf_func_id func_id) case BPF_FUNC_skc_to_unix_sock: func = &bpf_skc_to_unix_sock_proto; break; + case BPF_FUNC_skc_to_mptcp_sock: + func = &bpf_skc_to_mptcp_sock_proto; + break; case BPF_FUNC_ktime_get_coarse_ns: return &bpf_ktime_get_coarse_ns_proto; default: diff --git a/net/mptcp/Makefile b/net/mptcp/Makefile index e54daceac58b..168c55d1c917 100644 --- a/net/mptcp/Makefile +++ b/net/mptcp/Makefile @@ -10,3 +10,7 @@ obj-$(CONFIG_INET_MPTCP_DIAG) += mptcp_diag.o mptcp_crypto_test-objs := crypto_test.o mptcp_token_test-objs := token_test.o obj-$(CONFIG_MPTCP_KUNIT_TEST) += mptcp_crypto_test.o mptcp_token_test.o + +ifeq ($(CONFIG_BPF_JIT),y) +obj-$(CONFIG_BPF_SYSCALL) += bpf.o +endif diff --git a/net/mptcp/bpf.c b/net/mptcp/bpf.c new file mode 100644 index 000000000000..535602ba2582 --- /dev/null +++ b/net/mptcp/bpf.c @@ -0,0 +1,22 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Multipath TCP + * + * Copyright (c) 2020, Tessares SA. + * Copyright (c) 2022, SUSE. + * + * Author: Nicolas Rybowski + */ + +#define pr_fmt(fmt) "MPTCP: " fmt + +#include +#include "protocol.h" + +struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) +{ + if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && sk_is_mptcp(sk)) + return mptcp_sk(mptcp_subflow_ctx(sk)->conn); + + return NULL; +} +EXPORT_SYMBOL(bpf_mptcp_sock_from_subflow); diff --git a/scripts/bpf_doc.py b/scripts/bpf_doc.py index 096625242475..d5452f7eb996 100755 --- a/scripts/bpf_doc.py +++ b/scripts/bpf_doc.py @@ -633,6 +633,7 @@ class PrinterHelpers(Printer): 'struct socket', 'struct file', 'struct bpf_timer', + 'struct mptcp_sock', ] known_types = { '...', @@ -682,6 +683,7 @@ class PrinterHelpers(Printer): 'struct socket', 'struct file', 'struct bpf_timer', + 'struct mptcp_sock', } mapped_types = { 'u8': '__u8', diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 9ef1f3e1c22f..785f2cb15495 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -5143,6 +5143,12 @@ union bpf_attr { * The **hash_algo** is returned on success, * **-EOPNOTSUP** if the hash calculation failed or **-EINVAL** if * invalid arguments are passed. + * + * struct mptcp_sock *bpf_skc_to_mptcp_sock(void *sk) + * Description + * Dynamically cast a *sk* pointer to a *mptcp_sock* pointer. + * Return + * *sk* if casting is valid, or **NULL** otherwise. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -5339,6 +5345,7 @@ union bpf_attr { FN(copy_from_user_task), \ FN(skb_set_tstamp), \ FN(ima_file_hash), \ + FN(skc_to_mptcp_sock), \ /* */ /* integer value in 'imm' field of BPF_CALL instruction selects which helper From patchwork Wed Apr 20 22:24:55 2022 Content-Type: text/plain; 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20 Apr 2022 15:25:15 -0700 From: Mat Martineau To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: Nicolas Rybowski , ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, mptcp@lists.linux.dev, Matthieu Baerts , Geliang Tang , Mat Martineau Subject: [PATCH bpf-next 3/7] selftests: bpf: add MPTCP test base Date: Wed, 20 Apr 2022 15:24:55 -0700 Message-Id: <20220420222459.307649-4-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220420222459.307649-1-mathew.j.martineau@linux.intel.com> References: <20220420222459.307649-1-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: Nicolas Rybowski This patch adds a base for MPTCP specific tests. It is currently limited to the is_mptcp field in case of plain TCP connection because there is no easy way to get the subflow sk from a msk in userspace. This implies that we cannot lookup the sk_storage attached to the subflow sk in the sockops program. Acked-by: Matthieu Baerts Co-developed-by: Geliang Tang Signed-off-by: Geliang Tang Signed-off-by: Nicolas Rybowski Signed-off-by: Mat Martineau --- MAINTAINERS | 1 + tools/testing/selftests/bpf/config | 1 + tools/testing/selftests/bpf/network_helpers.c | 43 ++++-- tools/testing/selftests/bpf/network_helpers.h | 4 + .../testing/selftests/bpf/prog_tests/mptcp.c | 136 ++++++++++++++++++ .../testing/selftests/bpf/progs/mptcp_sock.c | 50 +++++++ 6 files changed, 227 insertions(+), 8 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/mptcp.c create mode 100644 tools/testing/selftests/bpf/progs/mptcp_sock.c diff --git a/MAINTAINERS b/MAINTAINERS index fd768d43e048..01fbdb0e0180 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13764,6 +13764,7 @@ F: include/net/mptcp.h F: include/trace/events/mptcp.h F: include/uapi/linux/mptcp.h F: net/mptcp/ +F: tools/testing/selftests/bpf/*/*mptcp*.c F: tools/testing/selftests/net/mptcp/ NETWORKING [TCP] diff --git a/tools/testing/selftests/bpf/config b/tools/testing/selftests/bpf/config index 763db63a3890..fe0d3ad6ecd8 100644 --- a/tools/testing/selftests/bpf/config +++ b/tools/testing/selftests/bpf/config @@ -53,3 +53,4 @@ CONFIG_NF_DEFRAG_IPV4=y CONFIG_NF_DEFRAG_IPV6=y CONFIG_NF_CONNTRACK=y CONFIG_USERFAULTFD=y +CONFIG_MPTCP=y diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c index 2bb1f9b3841d..c9a2e39e34fc 100644 --- a/tools/testing/selftests/bpf/network_helpers.c +++ b/tools/testing/selftests/bpf/network_helpers.c @@ -21,6 +21,10 @@ #include "network_helpers.h" #include "test_progs.h" +#ifndef IPPROTO_MPTCP +#define IPPROTO_MPTCP 262 +#endif + #define clean_errno() (errno == 0 ? "None" : strerror(errno)) #define log_err(MSG, ...) ({ \ int __save = errno; \ @@ -73,13 +77,13 @@ int settimeo(int fd, int timeout_ms) #define save_errno_close(fd) ({ int __save = errno; close(fd); errno = __save; }) -static int __start_server(int type, const struct sockaddr *addr, +static int __start_server(int type, int protocol, const struct sockaddr *addr, socklen_t addrlen, int timeout_ms, bool reuseport) { int on = 1; int fd; - fd = socket(addr->sa_family, type, 0); + fd = socket(addr->sa_family, type, protocol); if (fd < 0) { log_err("Failed to create server socket"); return -1; @@ -113,8 +117,8 @@ static int __start_server(int type, const struct sockaddr *addr, return -1; } -int start_server(int family, int type, const char *addr_str, __u16 port, - int timeout_ms) +static int start_server_proto(int family, int type, int protocol, + const char *addr_str, __u16 port, int timeout_ms) { struct sockaddr_storage addr; socklen_t addrlen; @@ -122,10 +126,23 @@ int start_server(int family, int type, const char *addr_str, __u16 port, if (make_sockaddr(family, addr_str, port, &addr, &addrlen)) return -1; - return __start_server(type, (struct sockaddr *)&addr, + return __start_server(type, protocol, (struct sockaddr *)&addr, addrlen, timeout_ms, false); } +int start_server(int family, int type, const char *addr_str, __u16 port, + int timeout_ms) +{ + return start_server_proto(family, type, 0, addr_str, port, timeout_ms); +} + +int start_mptcp_server(int family, const char *addr_str, __u16 port, + int timeout_ms) +{ + return start_server_proto(family, SOCK_STREAM, IPPROTO_MPTCP, addr_str, + port, timeout_ms); +} + int *start_reuseport_server(int family, int type, const char *addr_str, __u16 port, int timeout_ms, unsigned int nr_listens) { @@ -144,7 +161,7 @@ int *start_reuseport_server(int family, int type, const char *addr_str, if (!fds) return NULL; - fds[0] = __start_server(type, (struct sockaddr *)&addr, addrlen, + fds[0] = __start_server(type, 0, (struct sockaddr *)&addr, addrlen, timeout_ms, true); if (fds[0] == -1) goto close_fds; @@ -154,7 +171,7 @@ int *start_reuseport_server(int family, int type, const char *addr_str, goto close_fds; for (; nr_fds < nr_listens; nr_fds++) { - fds[nr_fds] = __start_server(type, (struct sockaddr *)&addr, + fds[nr_fds] = __start_server(type, 0, (struct sockaddr *)&addr, addrlen, timeout_ms, true); if (fds[nr_fds] == -1) goto close_fds; @@ -265,7 +282,7 @@ int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts) } addr_in = (struct sockaddr_in *)&addr; - fd = socket(addr_in->sin_family, type, 0); + fd = socket(addr_in->sin_family, type, opts->protocol); if (fd < 0) { log_err("Failed to create client socket"); return -1; @@ -298,6 +315,16 @@ int connect_to_fd(int server_fd, int timeout_ms) return connect_to_fd_opts(server_fd, &opts); } +int connect_to_mptcp_fd(int server_fd, int timeout_ms) +{ + struct network_helper_opts opts = { + .timeout_ms = timeout_ms, + .protocol = IPPROTO_MPTCP, + }; + + return connect_to_fd_opts(server_fd, &opts); +} + int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms) { struct sockaddr_storage addr; diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h index a4b3b2f9877b..e0feb115b2ae 100644 --- a/tools/testing/selftests/bpf/network_helpers.h +++ b/tools/testing/selftests/bpf/network_helpers.h @@ -21,6 +21,7 @@ struct network_helper_opts { const char *cc; int timeout_ms; bool must_fail; + int protocol; }; /* ipv4 test vector */ @@ -42,11 +43,14 @@ extern struct ipv6_packet pkt_v6; int settimeo(int fd, int timeout_ms); int start_server(int family, int type, const char *addr, __u16 port, int timeout_ms); +int start_mptcp_server(int family, const char *addr, __u16 port, + int timeout_ms); int *start_reuseport_server(int family, int type, const char *addr_str, __u16 port, int timeout_ms, unsigned int nr_listens); void free_fds(int *fds, unsigned int nr_close_fds); int connect_to_fd(int server_fd, int timeout_ms); +int connect_to_mptcp_fd(int server_fd, int timeout_ms); int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts); int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms); int fastopen_connect(int server_fd, const char *data, unsigned int data_len, diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c new file mode 100644 index 000000000000..cd548bb2828f --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020, Tessares SA. */ + +#include +#include "cgroup_helpers.h" +#include "network_helpers.h" + +struct mptcp_storage { + __u32 invoked; + __u32 is_mptcp; +}; + +static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 is_mptcp) +{ + int err = 0, cfd = client_fd; + struct mptcp_storage val; + + if (is_mptcp == 1) + return 0; + + if (CHECK_FAIL(bpf_map_lookup_elem(map_fd, &cfd, &val) < 0)) { + perror("Failed to read socket storage"); + return -1; + } + + if (val.invoked != 1) { + log_err("%s: unexpected invoked count %d != 1", + msg, val.invoked); + err++; + } + + if (val.is_mptcp != 0) { + log_err("%s: unexpected bpf_tcp_sock.is_mptcp %d != 0", + msg, val.is_mptcp); + err++; + } + + return err; +} + +static int run_test(int cgroup_fd, int server_fd, bool is_mptcp) +{ + int client_fd, prog_fd, map_fd, err; + struct bpf_program *prog; + struct bpf_object *obj; + struct bpf_map *map; + + obj = bpf_object__open("./mptcp_sock.o"); + if (libbpf_get_error(obj)) + return -EIO; + + err = bpf_object__load(obj); + if (CHECK_FAIL(err)) + goto out; + + prog = bpf_object__find_program_by_name(obj, "_sockops"); + if (CHECK_FAIL(!prog)) { + err = -EIO; + goto out; + } + + prog_fd = bpf_program__fd(prog); + if (CHECK_FAIL(prog_fd < 0)) { + err = -EIO; + goto out; + } + + map = bpf_object__find_map_by_name(obj, "socket_storage_map"); + if (CHECK_FAIL(!map)) { + err = -EIO; + goto out; + } + + map_fd = bpf_map__fd(map); + if (CHECK_FAIL(map_fd < 0)) { + err = -EIO; + goto out; + } + + err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_SOCK_OPS, 0); + if (CHECK_FAIL(err)) + goto out; + + client_fd = is_mptcp ? connect_to_mptcp_fd(server_fd, 0) : + connect_to_fd(server_fd, 0); + if (client_fd < 0) { + err = -EIO; + goto out; + } + + err += is_mptcp ? verify_sk(map_fd, client_fd, "MPTCP subflow socket", 1) : + verify_sk(map_fd, client_fd, "plain TCP socket", 0); + + close(client_fd); + +out: + bpf_object__close(obj); + return err; +} + +void test_base(void) +{ + int server_fd, cgroup_fd; + + cgroup_fd = test__join_cgroup("/mptcp"); + if (CHECK_FAIL(cgroup_fd < 0)) + return; + + /* without MPTCP */ + server_fd = start_server(AF_INET, SOCK_STREAM, NULL, 0, 0); + if (CHECK_FAIL(server_fd < 0)) + goto with_mptcp; + + CHECK_FAIL(run_test(cgroup_fd, server_fd, false)); + + close(server_fd); + +with_mptcp: + /* with MPTCP */ + server_fd = start_mptcp_server(AF_INET, NULL, 0, 0); + if (CHECK_FAIL(server_fd < 0)) + goto close_cgroup_fd; + + CHECK_FAIL(run_test(cgroup_fd, server_fd, true)); + + close(server_fd); + +close_cgroup_fd: + close(cgroup_fd); +} + +void test_mptcp(void) +{ + if (test__start_subtest("base")) + test_base(); +} diff --git a/tools/testing/selftests/bpf/progs/mptcp_sock.c b/tools/testing/selftests/bpf/progs/mptcp_sock.c new file mode 100644 index 000000000000..0d65fb889d03 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/mptcp_sock.c @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020, Tessares SA. */ + +#include +#include + +char _license[] SEC("license") = "GPL"; +__u32 _version SEC("version") = 1; + +struct mptcp_storage { + __u32 invoked; + __u32 is_mptcp; +}; + +struct { + __uint(type, BPF_MAP_TYPE_SK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, struct mptcp_storage); +} socket_storage_map SEC(".maps"); + +SEC("sockops") +int _sockops(struct bpf_sock_ops *ctx) +{ + struct mptcp_storage *storage; + struct bpf_tcp_sock *tcp_sk; + int op = (int)ctx->op; + struct bpf_sock *sk; + + if (op != BPF_SOCK_OPS_TCP_CONNECT_CB) + return 1; + + sk = ctx->sk; + if (!sk) + return 1; + + tcp_sk = bpf_tcp_sock(sk); + if (!tcp_sk) + return 1; + + storage = bpf_sk_storage_get(&socket_storage_map, sk, 0, + BPF_SK_STORAGE_GET_F_CREATE); + if (!storage) + return 1; + + storage->invoked++; + storage->is_mptcp = tcp_sk->is_mptcp; + + return 1; +} From patchwork Wed Apr 20 22:24:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mat Martineau X-Patchwork-Id: 12820861 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 7A7CDC433FE for ; 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X-IronPort-AV: E=McAfee;i="6400,9594,10323"; a="289277598" X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="289277598" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:17 -0700 X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="555422598" Received: from mjmartin-desk2.amr.corp.intel.com (HELO mjmartin-desk2.intel.com) ([10.209.100.38]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:16 -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 4/7] selftests: bpf: test bpf_skc_to_mptcp_sock Date: Wed, 20 Apr 2022 15:24:56 -0700 Message-Id: <20220420222459.307649-5-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220420222459.307649-1-mathew.j.martineau@linux.intel.com> References: <20220420222459.307649-1-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 extends the MPTCP test base, to test the new helper bpf_skc_to_mptcp_sock(). Define struct mptcp_sock in bpf_tcp_helpers.h, use bpf_skc_to_mptcp_sock to get the msk socket in progs/mptcp_sock.c and store the infos in socket_storage_map. Get the infos from socket_storage_map in prog_tests/mptcp.c. Add a new function verify_msk() to verify the infos of MPTCP socket, and rename verify_sk() to verify_tsk() to verify TCP socket only. Acked-by: Matthieu Baerts Signed-off-by: Geliang Tang Signed-off-by: Mat Martineau --- MAINTAINERS | 1 + .../testing/selftests/bpf/bpf_mptcp_helpers.h | 14 ++++++++ .../testing/selftests/bpf/prog_tests/mptcp.c | 36 +++++++++++++++---- .../testing/selftests/bpf/progs/mptcp_sock.c | 22 +++++++++--- 4 files changed, 62 insertions(+), 11 deletions(-) create mode 100644 tools/testing/selftests/bpf/bpf_mptcp_helpers.h diff --git a/MAINTAINERS b/MAINTAINERS index 01fbdb0e0180..f31fa73266f9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -13764,6 +13764,7 @@ F: include/net/mptcp.h F: include/trace/events/mptcp.h F: include/uapi/linux/mptcp.h F: net/mptcp/ +F: tools/testing/selftests/bpf/bpf_mptcp_helpers.h F: tools/testing/selftests/bpf/*/*mptcp*.c F: tools/testing/selftests/net/mptcp/ diff --git a/tools/testing/selftests/bpf/bpf_mptcp_helpers.h b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h new file mode 100644 index 000000000000..18da4cc65e89 --- /dev/null +++ b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2022, SUSE. */ + +#ifndef __BPF_MPTCP_HELPERS_H +#define __BPF_MPTCP_HELPERS_H + +#include "bpf_tcp_helpers.h" + +struct mptcp_sock { + struct inet_connection_sock sk; + +} __attribute__((preserve_access_index)); + +#endif diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index cd548bb2828f..4b40bbdaf91f 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -10,14 +10,12 @@ struct mptcp_storage { __u32 is_mptcp; }; -static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 is_mptcp) +static int verify_tsk(int map_fd, int client_fd) { + char *msg = "plain TCP socket"; int err = 0, cfd = client_fd; struct mptcp_storage val; - if (is_mptcp == 1) - return 0; - if (CHECK_FAIL(bpf_map_lookup_elem(map_fd, &cfd, &val) < 0)) { perror("Failed to read socket storage"); return -1; @@ -38,6 +36,32 @@ static int verify_sk(int map_fd, int client_fd, const char *msg, __u32 is_mptcp) return err; } +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; + + if (CHECK_FAIL(bpf_map_lookup_elem(map_fd, &cfd, &val) < 0)) { + perror("Failed to read socket storage"); + return -1; + } + + if (val.invoked != 1) { + log_err("%s: unexpected invoked count %d != 1", + msg, val.invoked); + err++; + } + + if (val.is_mptcp != 1) { + log_err("%s: unexpected bpf_tcp_sock.is_mptcp %d != 1", + msg, val.is_mptcp); + err++; + } + + return err; +} + static int run_test(int cgroup_fd, int server_fd, bool is_mptcp) { int client_fd, prog_fd, map_fd, err; @@ -88,8 +112,8 @@ static int run_test(int cgroup_fd, int server_fd, bool is_mptcp) goto out; } - err += is_mptcp ? verify_sk(map_fd, client_fd, "MPTCP subflow socket", 1) : - verify_sk(map_fd, client_fd, "plain TCP socket", 0); + err += is_mptcp ? verify_msk(map_fd, client_fd) : + verify_tsk(map_fd, client_fd); close(client_fd); diff --git a/tools/testing/selftests/bpf/progs/mptcp_sock.c b/tools/testing/selftests/bpf/progs/mptcp_sock.c index 0d65fb889d03..5cfaec4e7245 100644 --- a/tools/testing/selftests/bpf/progs/mptcp_sock.c +++ b/tools/testing/selftests/bpf/progs/mptcp_sock.c @@ -3,6 +3,7 @@ #include #include +#include "bpf_mptcp_helpers.h" char _license[] SEC("license") = "GPL"; __u32 _version SEC("version") = 1; @@ -24,6 +25,7 @@ int _sockops(struct bpf_sock_ops *ctx) { struct mptcp_storage *storage; struct bpf_tcp_sock *tcp_sk; + struct mptcp_sock *msk; int op = (int)ctx->op; struct bpf_sock *sk; @@ -38,11 +40,21 @@ int _sockops(struct bpf_sock_ops *ctx) if (!tcp_sk) return 1; - storage = bpf_sk_storage_get(&socket_storage_map, sk, 0, - BPF_SK_STORAGE_GET_F_CREATE); - if (!storage) - return 1; - + if (!tcp_sk->is_mptcp) { + storage = bpf_sk_storage_get(&socket_storage_map, sk, 0, + BPF_SK_STORAGE_GET_F_CREATE); + if (!storage) + return 1; + } else { + msk = bpf_skc_to_mptcp_sock(sk); + if (!msk) + return 1; + + storage = bpf_sk_storage_get(&socket_storage_map, msk, 0, + BPF_SK_STORAGE_GET_F_CREATE); + if (!storage) + return 1; + } storage->invoked++; storage->is_mptcp = tcp_sk->is_mptcp; From patchwork Wed Apr 20 22:24:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mat Martineau X-Patchwork-Id: 12820862 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 6EBA4C433F5 for ; Wed, 20 Apr 2022 22:25:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356318AbiDTW2O (ORCPT ); Wed, 20 Apr 2022 18:28:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34410 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356074AbiDTW2F (ORCPT ); Wed, 20 Apr 2022 18:28:05 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1783B40A1C; Wed, 20 Apr 2022 15:25:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1650493518; x=1682029518; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=3+l/q0awMNcnjC8pV+An6v6Ed4WAzYGKwHgbYfPu7PI=; b=WMNv1EmwX5kRLQA4zOd8j/FF2Uhz0AE+2ChOlJx7Rc2dj8uMb+s2nDnf dH6zTdEgVMC1UUeOB8Z8yvwP4c+YGjuyYNq4FgJqKyZrYzbTe3MqtUkgM W4p8mFpaKOQvTUwwD2urPZhjw6CCe27rAQa7vQBhDSMY48ww0IU0rsTpm WUclWx5olLj379oE1DHGNvgVK3uIJBOvMNCvmPnYKxlXgojEc8ceKnPRE mCxhP992jMggi3li0uDkUlDq2B6f1dWH7u//u0P1eWmRZFRfWmgv8/IRP Rct5NZkROOrEhPZlLabEvHzHBQVDH6W3scf5RcjmvsZreSQVw8PiCdd8B g==; X-IronPort-AV: E=McAfee;i="6400,9594,10323"; a="289277604" X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="289277604" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:17 -0700 X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="555422604" Received: from mjmartin-desk2.amr.corp.intel.com (HELO mjmartin-desk2.intel.com) ([10.209.100.38]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:17 -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 5/7] selftests: bpf: verify token of struct mptcp_sock Date: Wed, 20 Apr 2022 15:24:57 -0700 Message-Id: <20220420222459.307649-6-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220420222459.307649-1-mathew.j.martineau@linux.intel.com> References: <20220420222459.307649-1-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 the struct member token of struct mptcp_sock. Add a new function get_msk_token() to parse the msk token from the output of the command 'ip mptcp monitor', 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 + .../testing/selftests/bpf/prog_tests/mptcp.c | 66 +++++++++++++++++++ .../testing/selftests/bpf/progs/mptcp_sock.c | 5 ++ 3 files changed, 72 insertions(+) diff --git a/tools/testing/selftests/bpf/bpf_mptcp_helpers.h b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h index 18da4cc65e89..87e15810997d 100644 --- a/tools/testing/selftests/bpf/bpf_mptcp_helpers.h +++ b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h @@ -9,6 +9,7 @@ struct mptcp_sock { struct inet_connection_sock sk; + __u32 token; } __attribute__((preserve_access_index)); #endif diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index 4b40bbdaf91f..c5d96ba81e04 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -8,8 +8,11 @@ struct mptcp_storage { __u32 invoked; __u32 is_mptcp; + __u32 token; }; +static char monitor_log_path[64]; + static int verify_tsk(int map_fd, int client_fd) { char *msg = "plain TCP socket"; @@ -36,11 +39,58 @@ static int verify_tsk(int map_fd, int client_fd) return err; } +/* + * Parse the token from the output of 'ip mptcp monitor': + * + * [ CREATED] token=3ca933d3 remid=0 locid=0 saddr4=127.0.0.1 ... + * [ CREATED] token=2ab57040 remid=0 locid=0 saddr4=127.0.0.1 ... + */ +static __u32 get_msk_token(void) +{ + char *prefix = "[ CREATED] token="; + char buf[BUFSIZ] = {}; + __u32 token = 0; + ssize_t len; + int fd; + + sync(); + + fd = open(monitor_log_path, O_RDONLY); + if (CHECK_FAIL(fd < 0)) { + log_err("Failed to open %s", monitor_log_path); + return token; + } + + len = read(fd, buf, sizeof(buf)); + if (CHECK_FAIL(len < 0)) { + log_err("Failed to read %s", monitor_log_path); + goto err; + } + + if (strncmp(buf, prefix, strlen(prefix))) { + log_err("Invalid prefix %s", buf); + goto err; + } + + token = strtol(buf + strlen(prefix), NULL, 16); + +err: + close(fd); + return token; +} + 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; + __u32 token; + + token = get_msk_token(); + if (token <= 0) { + log_err("Unexpected token %x", token); + return -1; + } if (CHECK_FAIL(bpf_map_lookup_elem(map_fd, &cfd, &val) < 0)) { perror("Failed to read socket storage"); @@ -59,6 +109,12 @@ static int verify_msk(int map_fd, int client_fd) err++; } + if (val.token != token) { + log_err("Unexpected mptcp_sock.token %x != %x", + val.token, token); + err++; + } + return err; } @@ -124,6 +180,7 @@ static int run_test(int cgroup_fd, int server_fd, bool is_mptcp) void test_base(void) { + char cmd[256], tmp_dir[] = "/tmp/XXXXXX"; int server_fd, cgroup_fd; cgroup_fd = test__join_cgroup("/mptcp"); @@ -141,6 +198,13 @@ void test_base(void) with_mptcp: /* with MPTCP */ + if (CHECK_FAIL(!mkdtemp(tmp_dir))) + goto close_cgroup_fd; + snprintf(monitor_log_path, sizeof(monitor_log_path), + "%s/ip_mptcp_monitor", tmp_dir); + snprintf(cmd, sizeof(cmd), "ip mptcp monitor > %s &", monitor_log_path); + if (CHECK_FAIL(system(cmd))) + goto close_cgroup_fd; server_fd = start_mptcp_server(AF_INET, NULL, 0, 0); if (CHECK_FAIL(server_fd < 0)) goto close_cgroup_fd; @@ -148,6 +212,8 @@ void test_base(void) CHECK_FAIL(run_test(cgroup_fd, server_fd, true)); close(server_fd); + snprintf(cmd, sizeof(cmd), "rm -rf %s", tmp_dir); + system(cmd); close_cgroup_fd: close(cgroup_fd); diff --git a/tools/testing/selftests/bpf/progs/mptcp_sock.c b/tools/testing/selftests/bpf/progs/mptcp_sock.c index 5cfaec4e7245..56cc7c61131b 100644 --- a/tools/testing/selftests/bpf/progs/mptcp_sock.c +++ b/tools/testing/selftests/bpf/progs/mptcp_sock.c @@ -11,6 +11,7 @@ __u32 _version SEC("version") = 1; struct mptcp_storage { __u32 invoked; __u32 is_mptcp; + __u32 token; }; struct { @@ -45,6 +46,8 @@ int _sockops(struct bpf_sock_ops *ctx) BPF_SK_STORAGE_GET_F_CREATE); if (!storage) return 1; + + storage->token = 0; } else { msk = bpf_skc_to_mptcp_sock(sk); if (!msk) @@ -54,6 +57,8 @@ int _sockops(struct bpf_sock_ops *ctx) BPF_SK_STORAGE_GET_F_CREATE); if (!storage) return 1; + + storage->token = msk->token; } storage->invoked++; storage->is_mptcp = tcp_sk->is_mptcp; From patchwork Wed Apr 20 22:24:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mat Martineau X-Patchwork-Id: 12820860 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 32CB2C433F5 for ; Wed, 20 Apr 2022 22:25:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356256AbiDTW2J (ORCPT ); Wed, 20 Apr 2022 18:28:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356127AbiDTW2G (ORCPT ); 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20 Apr 2022 15:25:18 -0700 X-IronPort-AV: E=Sophos;i="5.90,276,1643702400"; d="scan'208";a="555422607" Received: from mjmartin-desk2.amr.corp.intel.com (HELO mjmartin-desk2.intel.com) ([10.209.100.38]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 15:25:17 -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 6/7] selftests: bpf: verify ca_name of struct mptcp_sock Date: Wed, 20 Apr 2022 15:24:58 -0700 Message-Id: <20220420222459.307649-7-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220420222459.307649-1-mathew.j.martineau@linux.intel.com> References: <20220420222459.307649-1-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 56cc7c61131b..53bf67580010 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" @@ -12,6 +13,7 @@ struct mptcp_storage { __u32 invoked; __u32 is_mptcp; __u32 token; + char ca_name[TCP_CA_NAME_MAX]; }; struct { @@ -48,6 +50,7 @@ int _sockops(struct bpf_sock_ops *ctx) return 1; storage->token = 0; + bzero(storage->ca_name, TCP_CA_NAME_MAX); } else { msk = bpf_skc_to_mptcp_sock(sk); if (!msk) @@ -59,6 +62,7 @@ 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; From patchwork Wed Apr 20 22:24:59 2022 Content-Type: text/plain; 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20 Apr 2022 15:25:18 -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 7/7] selftests: bpf: verify first of struct mptcp_sock Date: Wed, 20 Apr 2022 15:24:59 -0700 Message-Id: <20220420222459.307649-8-mathew.j.martineau@linux.intel.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220420222459.307649-1-mathew.j.martineau@linux.intel.com> References: <20220420222459.307649-1-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 the 'first' struct member of struct mptcp_sock, which points to the first subflow of msk. Save 'sk' in mptcp_storage, and verify it with 'first' in verify_msk(). Acked-by: Matthieu Baerts Signed-off-by: Geliang Tang Signed-off-by: Mat Martineau --- tools/testing/selftests/bpf/bpf_mptcp_helpers.h | 1 + tools/testing/selftests/bpf/prog_tests/mptcp.c | 8 ++++++++ tools/testing/selftests/bpf/progs/mptcp_sock.c | 5 +++++ 3 files changed, 14 insertions(+) diff --git a/tools/testing/selftests/bpf/bpf_mptcp_helpers.h b/tools/testing/selftests/bpf/bpf_mptcp_helpers.h index 463e4e061c96..b5a43b108982 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; + struct sock *first; char ca_name[TCP_CA_NAME_MAX]; } __attribute__((preserve_access_index)); diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index 4518aa6e661e..7e704f5aab05 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -12,7 +12,9 @@ struct mptcp_storage { __u32 invoked; __u32 is_mptcp; + struct sock *sk; __u32 token; + struct sock *first; char ca_name[TCP_CA_NAME_MAX]; }; @@ -133,6 +135,12 @@ static int verify_msk(int map_fd, int client_fd) err++; } + if (val.first != val.sk) { + log_err("Unexpected mptcp_sock.first %p != %p", + val.first, val.sk); + 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); diff --git a/tools/testing/selftests/bpf/progs/mptcp_sock.c b/tools/testing/selftests/bpf/progs/mptcp_sock.c index 53bf67580010..1d1ac7cda2a2 100644 --- a/tools/testing/selftests/bpf/progs/mptcp_sock.c +++ b/tools/testing/selftests/bpf/progs/mptcp_sock.c @@ -12,7 +12,9 @@ __u32 _version SEC("version") = 1; struct mptcp_storage { __u32 invoked; __u32 is_mptcp; + struct sock *sk; __u32 token; + struct sock *first; char ca_name[TCP_CA_NAME_MAX]; }; @@ -51,6 +53,7 @@ int _sockops(struct bpf_sock_ops *ctx) storage->token = 0; bzero(storage->ca_name, TCP_CA_NAME_MAX); + storage->first = NULL; } else { msk = bpf_skc_to_mptcp_sock(sk); if (!msk) @@ -63,9 +66,11 @@ int _sockops(struct bpf_sock_ops *ctx) storage->token = msk->token; memcpy(storage->ca_name, msk->ca_name, TCP_CA_NAME_MAX); + storage->first = msk->first; } storage->invoked++; storage->is_mptcp = tcp_sk->is_mptcp; + storage->sk = (struct sock *)sk; return 1; }