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Fri, 11 Mar 2022 16:36:52 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by rnnvmail204.nvidia.com (10.129.68.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Fri, 11 Mar 2022 08:36:51 -0800 Received: from vdi.nvidia.com (10.127.8.12) by mail.nvidia.com (10.129.68.8) with Microsoft SMTP Server id 15.2.986.22 via Frontend Transport; Fri, 11 Mar 2022 08:36:44 -0800 From: Maxim Mikityanskiy To: , Alexei Starovoitov , "Daniel Borkmann" , Andrii Nakryiko , CC: Tariq Toukan , Martin KaFai Lau , "Song Liu" , Yonghong Song , John Fastabend , KP Singh , "David S. Miller" , Jakub Kicinski , Petar Penkov , Lorenz Bauer , Eric Dumazet , Hideaki YOSHIFUJI , "David Ahern" , Shuah Khan , "Jesper Dangaard Brouer" , Nathan Chancellor , "Nick Desaulniers" , Joe Stringer , "Florent Revest" , , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , "Kumar Kartikeya Dwivedi" , Florian Westphal , "Maxim Mikityanskiy" Subject: [PATCH bpf-next v4 0/5] New BPF helpers to accelerate synproxy Date: Fri, 11 Mar 2022 18:36:37 +0200 Message-ID: <20220311163642.1003590-1-maximmi@nvidia.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 67d068a3-3765-4e1d-66ec-08da037d59c0 X-MS-TrafficTypeDiagnostic: DM5PR12MB1212:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.238;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230001)(4636009)(46966006)(36840700001)(40470700004)(36756003)(54906003)(2906002)(70586007)(70206006)(110136005)(316002)(6666004)(966005)(508600001)(7696005)(8936002)(7416002)(5660300002)(4326008)(8676002)(83380400001)(426003)(336012)(186003)(2616005)(1076003)(26005)(81166007)(107886003)(40460700003)(86362001)(82310400004)(47076005)(36860700001)(356005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Mar 2022 16:36:53.6048 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 67d068a3-3765-4e1d-66ec-08da037d59c0 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.238];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT018.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB1212 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The first patch of this series is an improvement to the existing syncookie BPF helper. The second patch is a documentation fix. The third patch allows BPF helpers to accept memory regions of fixed size without doing runtime size checks. The two last patches add new functionality that allows XDP to accelerate iptables synproxy. v1 of this series [1] used to include a patch that exposed conntrack lookup to BPF using stable helpers. It was superseded by series [2] by Kumar Kartikeya Dwivedi, which implements this functionality using unstable helpers. The fourth patch adds new helpers to issue and check SYN cookies without binding to a socket, which is useful in the synproxy scenario. The fifth patch adds a selftest, which consists of a script, an XDP program and a userspace control application. The XDP program uses socketless SYN cookie helpers and queries conntrack status instead of socket status. The userspace control application allows to tune parameters of the XDP program. This program also serves as a minimal example of usage of the new functionality. The draft of the new functionality was presented on Netdev 0x15 [3]. v2 changes: Split into two series, submitted bugfixes to bpf, dropped the conntrack patches, implemented the timestamp cookie in BPF using bpf_loop, dropped the timestamp cookie patch. v3 changes: Moved some patches from bpf to bpf-next, dropped the patch that changed error codes, split the new helpers into IPv4/IPv6, added verifier functionality to accept memory regions of fixed size. v4 changes: Converted the selftest to the test_progs runner. Replaced some deprecated functions in xdp_synproxy userspace helper. [1]: https://lore.kernel.org/bpf/20211020095815.GJ28644@breakpoint.cc/t/ [2]: https://lore.kernel.org/bpf/20220114163953.1455836-1-memxor@gmail.com/ [3]: https://netdevconf.info/0x15/session.html?Accelerating-synproxy-with-XDP Maxim Mikityanskiy (5): bpf: Use ipv6_only_sock in bpf_tcp_gen_syncookie bpf: Fix documentation of th_len in bpf_tcp_{gen,check}_syncookie bpf: Allow helpers to accept pointers with a fixed size bpf: Add helpers to issue and check SYN cookies in XDP bpf: Add selftests for raw syncookie helpers include/linux/bpf.h | 10 + include/net/tcp.h | 1 + include/uapi/linux/bpf.h | 100 ++- kernel/bpf/verifier.c | 26 +- net/core/filter.c | 128 ++- net/ipv4/tcp_input.c | 3 +- scripts/bpf_doc.py | 4 + tools/include/uapi/linux/bpf.h | 100 ++- tools/testing/selftests/bpf/.gitignore | 1 + tools/testing/selftests/bpf/Makefile | 2 +- .../selftests/bpf/prog_tests/xdp_synproxy.c | 101 +++ .../selftests/bpf/progs/xdp_synproxy_kern.c | 750 ++++++++++++++++++ tools/testing/selftests/bpf/xdp_synproxy.c | 418 ++++++++++ 13 files changed, 1622 insertions(+), 22 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_synproxy.c create mode 100644 tools/testing/selftests/bpf/progs/xdp_synproxy_kern.c create mode 100644 tools/testing/selftests/bpf/xdp_synproxy.c