From mboxrd@z Thu Jan 1 00:00:00 1970 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 B124AC001DE for ; Tue, 25 Jul 2023 13:21:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230081AbjGYNVH (ORCPT ); Tue, 25 Jul 2023 09:21:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230078AbjGYNVF (ORCPT ); Tue, 25 Jul 2023 09:21:05 -0400 Received: from mail-ej1-x634.google.com (mail-ej1-x634.google.com [IPv6:2a00:1450:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7C4791FFA for ; Tue, 25 Jul 2023 06:20:58 -0700 (PDT) Received: by mail-ej1-x634.google.com with SMTP id a640c23a62f3a-9939fbb7191so1165926466b.0 for ; Tue, 25 Jul 2023 06:20:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; t=1690291257; x=1690896057; h=mime-version:message-id:in-reply-to:date:subject:cc:to:from :user-agent:references:from:to:cc:subject:date:message-id:reply-to; bh=Re/z3nObvtjSOuqc2XvuozwPKWBuW5694/qbzOrvreM=; b=avOtOUW+Cj7SR0Q9peI/1FD6B3M1N5Hr+fpAclHpm7L8hzrxsUoV1RTF4m5DA/Dq6a YJrqZXEXN7nHdcOkn45MQip/pZDwfl59O6sLsgxXu550emMbxOb105bU8WmyRsMyqKeR DiZpVUvn/srF5U00xeHXv3iBuwmiPGmWrnWb4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690291257; x=1690896057; h=mime-version:message-id:in-reply-to:date:subject:cc:to:from :user-agent:references:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=Re/z3nObvtjSOuqc2XvuozwPKWBuW5694/qbzOrvreM=; b=NomMz0eZoV16/r2ZxpGx0hGeYGM+uzz40Coaq8xzgt2+SYKNBFoaiigkga+VAuA06G fvYID/uwSqS4sDUGo6XteM4bNmtKuxxyNx2MHT1MBFLiUN3xc6XK+C2GsOT/B+BZbtqQ S62eG7BRJFkgtzrp8MW6CREAOJiV6HojC3Weri60+WAPBzLtAb78CFDGa28yFgDDeLSk UhZgOoCR6osCJJ0MesN2b3HRSCMHbqNsxXMBDc5XHhB4LQgz8j/+Bp6qDwCFWaTdaNhs Oe3k9rSMT3SHASpXfey1capS/it6tWOSq7DiDvJK5R5l8jCKueG8UPnJ4Rd5K8KKYfmt pN4Q== X-Gm-Message-State: ABy/qLaEW8MRPTC7MSYUr054EHA9gRZzOVWGFo2ktSXwbkIxqZXkIHUS eKtcDdznsD0z34pIJyJpxwjS8w== X-Google-Smtp-Source: APBJJlH+qEf1EkwtzcMEpjPEgMFdKkhYpww/2/CnlXcjZ72gg/UoQUeciPbGIm5RrLkuaIIGMvU/lQ== X-Received: by 2002:a17:907:2c4f:b0:993:d632:2c3 with SMTP id hf15-20020a1709072c4f00b00993d63202c3mr2315057ejc.21.1690291256910; Tue, 25 Jul 2023 06:20:56 -0700 (PDT) Received: from cloudflare.com (79.184.214.102.ipv4.supernova.orange.pl. [79.184.214.102]) by smtp.gmail.com with ESMTPSA id j1-20020a170906254100b00992076f4a01sm8117208ejb.190.2023.07.25.06.20.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Jul 2023 06:20:56 -0700 (PDT) References: User-agent: mu4e 1.6.10; emacs 28.2 From: Jakub Sitnicki To: Yan Zhai Cc: bpf@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Mykola Lysenko , Shuah Khan , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Jordan Griege , kernel-team@cloudflare.com Subject: Re: [PATCH v3 bpf 0/2] bpf: return proper error codes for lwt redirect Date: Tue, 25 Jul 2023 15:20:06 +0200 In-reply-to: Message-ID: <87mszkxh3c.fsf@cloudflare.com> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On Mon, Jul 24, 2023 at 09:12 PM -07, Yan Zhai wrote: > lwt xmit hook does not expect positive return values in function > ip_finish_output2 and ip6_finish_output2. However, BPF redirect programs > can return positive values such like NET_XMIT_DROP, NET_RX_DROP, and etc > as errors. Such return values can panic the kernel unexpectedly: > > https://gist.github.com/zhaiyan920/8fbac245b261fe316a7ef04c9b1eba48 > > This patch fixes the return values from BPF redirect, so the error > handling would be consistent at xmit hook. It also adds a few test cases > to prevent future regressions. > > v2: https://lore.kernel.org/netdev/ZLdY6JkWRccunvu0@debian.debian/ > v1: https://lore.kernel.org/bpf/ZLbYdpWC8zt9EJtq@debian.debian/ > > changes since v2: > * subject name changed > * also covered redirect to ingress case > * added selftests > > changes since v1: > * minor code style changes > > Yan Zhai (2): > bpf: fix skb_do_redirect return values > bpf: selftests: add lwt redirect regression test cases > > net/core/filter.c | 12 +- > tools/testing/selftests/bpf/Makefile | 1 + > .../selftests/bpf/progs/test_lwt_redirect.c | 67 +++++++ > .../selftests/bpf/test_lwt_redirect.sh | 165 ++++++++++++++++++ > 4 files changed, 244 insertions(+), 1 deletion(-) > create mode 100644 tools/testing/selftests/bpf/progs/test_lwt_redirect.c > create mode 100755 tools/testing/selftests/bpf/test_lwt_redirect.sh For the series: Tested-by: Jakub Sitnicki