From patchwork Wed May 17 05:22:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Fastabend X-Patchwork-Id: 13244222 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 B430C11199; Wed, 17 May 2023 05:23:19 +0000 (UTC) Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DDFD13C25; Tue, 16 May 2023 22:23:12 -0700 (PDT) Received: by mail-pf1-x435.google.com with SMTP id d2e1a72fcca58-64a9335a8e7so10616615b3a.0; Tue, 16 May 2023 22:23:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1684300992; x=1686892992; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=yWuuJj1UmKb8bhc9koutosmHK7yiCrZ5XUNipDsC3uQ=; b=A5YcKUbXy2aPMmWCljFPbHsoJaDh+VqqnX2h+7Ul+kE3Z9/dHWHtWobnwI1R5+WwnR CQ8ArI74Azg14LWpzNTEGfPmz1Lgrv0JpZFmHrm4u8kmwLy24HcT28sPdLjJPD+tZsCY VfcRAFoSXuw8xQL8o2HfktHL/kx6cyYFKQj+QieQGyu7QDAG/k3cI2WAWyL61ZAFZbaT LPm08MrBP41WIFALyUU1aOvj/6+8YT49vSnPlD9rag0pV+2jHeROuOi/9hP2Cq62TIQl vq2L/gGGu+y16BmOXoSqX5VGkIGwEAWtCto09RwqmmXucgJhBiClmb9SqVmP9n3iaUea aMVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684300992; x=1686892992; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=yWuuJj1UmKb8bhc9koutosmHK7yiCrZ5XUNipDsC3uQ=; b=VO0cShCC+2OjA1hTaK4d5GD8UtCXMIZuX7G3YPwKETI0P/z+ZFQOsZP2ablGBqrGHm q5pEyycp2RsMrIv8BMlJl0ij09iMJPzFwNdPZVdtumEyL0vtBFwgJrTTytH9D9kYRNE7 SstuxkPFRxEmQYrhRyqjBtTpVwlVYgjPNSutz6LXODwwDqc3VIcbPDvoHLGncetiqwUm d19O4DmqRd8mhko7ggveukEMdHVLQWsIj2y7mhzC6Of7zoRo3MiF/effZgQdqAssSaV9 QYHzyFPGtOlSCADLX8OA28S3G7Gp3I5MQUUig3jeIq3JLenAFn9gZ338xZM1t06NSI7y Dm4A== X-Gm-Message-State: AC+VfDxeCHx2+NiVK2WLaoTXpqgqGabNvKbkqo7TMpEBGyY4YgqXEfGr nNxe/hknWrFw0V34ean1vMk= X-Google-Smtp-Source: ACHHUZ5TrMY+eb8hyXU4QkIUempAE70jHDU6EBB8Kgvydk0Zg6HXLuOEUE3HS60cv0gXXls0XCVpyQ== X-Received: by 2002:a17:90a:d389:b0:24e:3752:194f with SMTP id q9-20020a17090ad38900b0024e3752194fmr1278239pju.21.1684300992267; Tue, 16 May 2023 22:23:12 -0700 (PDT) Received: from john.lan ([98.97.37.198]) by smtp.gmail.com with ESMTPSA id n11-20020a17090a2fcb00b0023cfdbb6496sm581779pjm.1.2023.05.16.22.23.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 May 2023 22:23:11 -0700 (PDT) From: John Fastabend To: jakub@cloudflare.com, daniel@iogearbox.net Cc: john.fastabend@gmail.com, bpf@vger.kernel.org, netdev@vger.kernel.org, edumazet@google.com, ast@kernel.org, andrii@kernel.org, will@isovalent.com Subject: [PATCH bpf v8 13/13] bpf: sockmap, test FIONREAD returns correct bytes in rx buffer with drops Date: Tue, 16 May 2023 22:22:44 -0700 Message-Id: <20230517052244.294755-14-john.fastabend@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20230517052244.294755-1-john.fastabend@gmail.com> References: <20230517052244.294755-1-john.fastabend@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net When BPF program drops pkts the sockmap logic 'eats' the packet and updates copied_seq. In the PASS case where the sk_buff is accepted we update copied_seq from recvmsg path so we need a new test to handle the drop case. Original patch series broke this resulting in test_sockmap_skb_verdict_fionread:PASS:ioctl(FIONREAD) error 0 nsec test_sockmap_skb_verdict_fionread:FAIL:ioctl(FIONREAD) unexpected ioctl(FIONREAD): actual 1503041772 != expected 256 #176/17 sockmap_basic/sockmap skb_verdict fionread on drop:FAIL After updated patch with fix. #176/16 sockmap_basic/sockmap skb_verdict fionread:OK #176/17 sockmap_basic/sockmap skb_verdict fionread on drop:OK Reviewed-by: Jakub Sitnicki Signed-off-by: John Fastabend --- .../selftests/bpf/prog_tests/sockmap_basic.c | 47 ++++++++++++++----- .../bpf/progs/test_sockmap_drop_prog.c | 32 +++++++++++++ 2 files changed, 66 insertions(+), 13 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_drop_prog.c diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c index fe56049f6568..064cc5e8d9ad 100644 --- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c +++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c @@ -11,6 +11,7 @@ #include "test_sockmap_skb_verdict_attach.skel.h" #include "test_sockmap_progs_query.skel.h" #include "test_sockmap_pass_prog.skel.h" +#include "test_sockmap_drop_prog.skel.h" #include "bpf_iter_sockmap.skel.h" #include "sockmap_helpers.h" @@ -410,19 +411,31 @@ static void test_sockmap_skb_verdict_shutdown(void) test_sockmap_pass_prog__destroy(skel); } -static void test_sockmap_skb_verdict_fionread(void) +static void test_sockmap_skb_verdict_fionread(bool pass_prog) { + int expected, zero = 0, sent, recvd, avail; int err, map, verdict, s, c0, c1, p0, p1; - struct test_sockmap_pass_prog *skel; - int zero = 0, sent, recvd, avail; + struct test_sockmap_pass_prog *pass; + struct test_sockmap_drop_prog *drop; char buf[256] = "0123456789"; - skel = test_sockmap_pass_prog__open_and_load(); - if (!ASSERT_OK_PTR(skel, "open_and_load")) - return; + if (pass_prog) { + pass = test_sockmap_pass_prog__open_and_load(); + if (!ASSERT_OK_PTR(pass, "open_and_load")) + return; + verdict = bpf_program__fd(pass->progs.prog_skb_verdict); + map = bpf_map__fd(pass->maps.sock_map_rx); + expected = sizeof(buf); + } else { + drop = test_sockmap_drop_prog__open_and_load(); + if (!ASSERT_OK_PTR(drop, "open_and_load")) + return; + verdict = bpf_program__fd(drop->progs.prog_skb_verdict); + map = bpf_map__fd(drop->maps.sock_map_rx); + /* On drop data is consumed immediately and copied_seq inc'd */ + expected = 0; + } - verdict = bpf_program__fd(skel->progs.prog_skb_verdict); - map = bpf_map__fd(skel->maps.sock_map_rx); err = bpf_prog_attach(verdict, map, BPF_SK_SKB_STREAM_VERDICT, 0); if (!ASSERT_OK(err, "bpf_prog_attach")) @@ -443,9 +456,12 @@ static void test_sockmap_skb_verdict_fionread(void) ASSERT_EQ(sent, sizeof(buf), "xsend(p0)"); err = ioctl(c1, FIONREAD, &avail); ASSERT_OK(err, "ioctl(FIONREAD) error"); - ASSERT_EQ(avail, sizeof(buf), "ioctl(FIONREAD)"); - recvd = recv_timeout(c1, &buf, sizeof(buf), SOCK_NONBLOCK, IO_TIMEOUT_SEC); - ASSERT_EQ(recvd, sizeof(buf), "recv_timeout(c0)"); + ASSERT_EQ(avail, expected, "ioctl(FIONREAD)"); + /* On DROP test there will be no data to read */ + if (pass_prog) { + recvd = recv_timeout(c1, &buf, sizeof(buf), SOCK_NONBLOCK, IO_TIMEOUT_SEC); + ASSERT_EQ(recvd, sizeof(buf), "recv_timeout(c0)"); + } out_close: close(c0); @@ -453,7 +469,10 @@ static void test_sockmap_skb_verdict_fionread(void) close(c1); close(p1); out: - test_sockmap_pass_prog__destroy(skel); + if (pass_prog) + test_sockmap_pass_prog__destroy(pass); + else + test_sockmap_drop_prog__destroy(drop); } void test_sockmap_basic(void) @@ -493,5 +512,7 @@ void test_sockmap_basic(void) if (test__start_subtest("sockmap skb_verdict shutdown")) test_sockmap_skb_verdict_shutdown(); if (test__start_subtest("sockmap skb_verdict fionread")) - test_sockmap_skb_verdict_fionread(); + test_sockmap_skb_verdict_fionread(true); + if (test__start_subtest("sockmap skb_verdict fionread on drop")) + test_sockmap_skb_verdict_fionread(false); } diff --git a/tools/testing/selftests/bpf/progs/test_sockmap_drop_prog.c b/tools/testing/selftests/bpf/progs/test_sockmap_drop_prog.c new file mode 100644 index 000000000000..29314805ce42 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_sockmap_drop_prog.c @@ -0,0 +1,32 @@ +#include +#include +#include + +struct { + __uint(type, BPF_MAP_TYPE_SOCKMAP); + __uint(max_entries, 20); + __type(key, int); + __type(value, int); +} sock_map_rx SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_SOCKMAP); + __uint(max_entries, 20); + __type(key, int); + __type(value, int); +} sock_map_tx SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_SOCKMAP); + __uint(max_entries, 20); + __type(key, int); + __type(value, int); +} sock_map_msg SEC(".maps"); + +SEC("sk_skb") +int prog_skb_verdict(struct __sk_buff *skb) +{ + return SK_DROP; +} + +char _license[] SEC("license") = "GPL";