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[2001:8b0:7a5a:26ff:ce9a:86a0:ecdd:9c3c]) by smtp.gmail.com with ESMTPSA id j7sm2837854wrp.72.2021.02.10.04.04.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Feb 2021 04:04:40 -0800 (PST) From: Lorenz Bauer To: Shuah Khan , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: kernel-team@cloudflare.com, Lorenz Bauer , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH bpf 3/4] tools/testing: add test for NS_GET_COOKIE Date: Wed, 10 Feb 2021 12:04:24 +0000 Message-Id: <20210210120425.53438-4-lmb@cloudflare.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210210120425.53438-1-lmb@cloudflare.com> References: <20210210120425.53438-1-lmb@cloudflare.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Check that NS_GET_COOKIE returns a non-zero value, and that distinct network namespaces have different cookies. Signed-off-by: Lorenz Bauer --- tools/testing/selftests/nsfs/.gitignore | 1 + tools/testing/selftests/nsfs/Makefile | 2 +- tools/testing/selftests/nsfs/netns.c | 57 +++++++++++++++++++++++++ 3 files changed, 59 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/nsfs/netns.c diff --git a/tools/testing/selftests/nsfs/.gitignore b/tools/testing/selftests/nsfs/.gitignore index ed79ebdf286e..ca31b216215b 100644 --- a/tools/testing/selftests/nsfs/.gitignore +++ b/tools/testing/selftests/nsfs/.gitignore @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only owner pidns +netns diff --git a/tools/testing/selftests/nsfs/Makefile b/tools/testing/selftests/nsfs/Makefile index dd9bd50b7b93..93793cdb5a7c 100644 --- a/tools/testing/selftests/nsfs/Makefile +++ b/tools/testing/selftests/nsfs/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only -TEST_GEN_PROGS := owner pidns +TEST_GEN_PROGS := owner pidns netns CFLAGS := -Wall -Werror diff --git a/tools/testing/selftests/nsfs/netns.c b/tools/testing/selftests/nsfs/netns.c new file mode 100644 index 000000000000..8ab862667b45 --- /dev/null +++ b/tools/testing/selftests/nsfs/netns.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include + +#define NSIO 0xb7 +#define NS_GET_COOKIE _IO(NSIO, 0x5) + +#define pr_err(fmt, ...) \ + ({ \ + fprintf(stderr, "%s:%d:" fmt ": %m\n", \ + __func__, __LINE__, ##__VA_ARGS__); \ + 1; \ + }) + +int main(int argc, char *argvp[]) +{ + uint64_t cookie1, cookie2; + char path[128]; + int ns; + + snprintf(path, sizeof(path), "/proc/%d/ns/net", getpid()); + ns = open(path, O_RDONLY); + if (ns < 0) + return pr_err("Unable to open %s", path); + + if (ioctl(ns, NS_GET_COOKIE, &cookie1)) + return pr_err("Unable to get first namespace cookie"); + + if (!cookie1) + return pr_err("NS_GET_COOKIE returned zero first cookie"); + + close(ns); + if (unshare(CLONE_NEWNET)) + return pr_err("unshare"); + + ns = open(path, O_RDONLY); + if (ns < 0) + return pr_err("Unable to open %s", path); + + if (ioctl(ns, NS_GET_COOKIE, &cookie2)) + return pr_err("Unable to get second namespace cookie"); + + if (!cookie2) + return pr_err("NS_GET_COOKIE returned zero second cookie"); + + if (cookie1 == cookie2) + return pr_err("NS_GET_COOKIE returned identical cookies for distinct ns"); + + close(ns); + return 0; +}