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Message-Id: <20220107215438.321922-3-toke@redhat.com>
Date: Fri, 7 Jan 2022 22:54:37 +0100
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Toke Høiland-Jørgensen <toke@...hat.com>,
Shuah Khan <shuah@...nel.org>, netdev@...r.kernel.org,
bpf@...r.kernel.org
Subject: [PATCH bpf-next v7 2/3] selftests/bpf: Move open_netns() and close_netns() into network_helpers.c
These will also be used by the xdp_do_redirect test being added in the next
commit.
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
tools/testing/selftests/bpf/network_helpers.c | 86 ++++++++++++++++++
tools/testing/selftests/bpf/network_helpers.h | 9 ++
.../selftests/bpf/prog_tests/tc_redirect.c | 87 -------------------
3 files changed, 95 insertions(+), 87 deletions(-)
diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index 6db1af8fdee7..2bb1f9b3841d 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -1,18 +1,25 @@
// SPDX-License-Identifier: GPL-2.0-only
+#define _GNU_SOURCE
+
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
+#include <sched.h>
#include <arpa/inet.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
#include <linux/err.h>
#include <linux/in.h>
#include <linux/in6.h>
+#include <linux/limits.h>
#include "bpf_util.h"
#include "network_helpers.h"
+#include "test_progs.h"
#define clean_errno() (errno == 0 ? "None" : strerror(errno))
#define log_err(MSG, ...) ({ \
@@ -356,3 +363,82 @@ char *ping_command(int family)
}
return "ping";
}
+
+struct nstoken {
+ int orig_netns_fd;
+};
+
+static int setns_by_fd(int nsfd)
+{
+ int err;
+
+ err = setns(nsfd, CLONE_NEWNET);
+ close(nsfd);
+
+ if (!ASSERT_OK(err, "setns"))
+ return err;
+
+ /* Switch /sys to the new namespace so that e.g. /sys/class/net
+ * reflects the devices in the new namespace.
+ */
+ err = unshare(CLONE_NEWNS);
+ if (!ASSERT_OK(err, "unshare"))
+ return err;
+
+ /* Make our /sys mount private, so the following umount won't
+ * trigger the global umount in case it's shared.
+ */
+ err = mount("none", "/sys", NULL, MS_PRIVATE, NULL);
+ if (!ASSERT_OK(err, "remount private /sys"))
+ return err;
+
+ err = umount2("/sys", MNT_DETACH);
+ if (!ASSERT_OK(err, "umount2 /sys"))
+ return err;
+
+ err = mount("sysfs", "/sys", "sysfs", 0, NULL);
+ if (!ASSERT_OK(err, "mount /sys"))
+ return err;
+
+ err = mount("bpffs", "/sys/fs/bpf", "bpf", 0, NULL);
+ if (!ASSERT_OK(err, "mount /sys/fs/bpf"))
+ return err;
+
+ return 0;
+}
+
+struct nstoken *open_netns(const char *name)
+{
+ int nsfd;
+ char nspath[PATH_MAX];
+ int err;
+ struct nstoken *token;
+
+ token = malloc(sizeof(struct nstoken));
+ if (!ASSERT_OK_PTR(token, "malloc token"))
+ return NULL;
+
+ token->orig_netns_fd = open("/proc/self/ns/net", O_RDONLY);
+ if (!ASSERT_GE(token->orig_netns_fd, 0, "open /proc/self/ns/net"))
+ goto fail;
+
+ snprintf(nspath, sizeof(nspath), "%s/%s", "/var/run/netns", name);
+ nsfd = open(nspath, O_RDONLY | O_CLOEXEC);
+ if (!ASSERT_GE(nsfd, 0, "open netns fd"))
+ goto fail;
+
+ err = setns_by_fd(nsfd);
+ if (!ASSERT_OK(err, "setns_by_fd"))
+ goto fail;
+
+ return token;
+fail:
+ free(token);
+ return NULL;
+}
+
+void close_netns(struct nstoken *token)
+{
+ ASSERT_OK(setns_by_fd(token->orig_netns_fd), "setns_by_fd");
+ free(token);
+}
diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index d198181a5648..a4b3b2f9877b 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -55,4 +55,13 @@ int make_sockaddr(int family, const char *addr_str, __u16 port,
struct sockaddr_storage *addr, socklen_t *len);
char *ping_command(int family);
+struct nstoken;
+/**
+ * open_netns() - Switch to specified network namespace by name.
+ *
+ * Returns token with which to restore the original namespace
+ * using close_netns().
+ */
+struct nstoken *open_netns(const char *name);
+void close_netns(struct nstoken *token);
#endif
diff --git a/tools/testing/selftests/bpf/prog_tests/tc_redirect.c b/tools/testing/selftests/bpf/prog_tests/tc_redirect.c
index c2426df58e17..0a13c7eb40f3 100644
--- a/tools/testing/selftests/bpf/prog_tests/tc_redirect.c
+++ b/tools/testing/selftests/bpf/prog_tests/tc_redirect.c
@@ -17,10 +17,8 @@
#include <linux/if_tun.h>
#include <linux/limits.h>
#include <linux/sysctl.h>
-#include <sched.h>
#include <stdbool.h>
#include <stdio.h>
-#include <sys/mount.h>
#include <sys/stat.h>
#include <unistd.h>
@@ -84,91 +82,6 @@ static int write_file(const char *path, const char *newval)
return 0;
}
-struct nstoken {
- int orig_netns_fd;
-};
-
-static int setns_by_fd(int nsfd)
-{
- int err;
-
- err = setns(nsfd, CLONE_NEWNET);
- close(nsfd);
-
- if (!ASSERT_OK(err, "setns"))
- return err;
-
- /* Switch /sys to the new namespace so that e.g. /sys/class/net
- * reflects the devices in the new namespace.
- */
- err = unshare(CLONE_NEWNS);
- if (!ASSERT_OK(err, "unshare"))
- return err;
-
- /* Make our /sys mount private, so the following umount won't
- * trigger the global umount in case it's shared.
- */
- err = mount("none", "/sys", NULL, MS_PRIVATE, NULL);
- if (!ASSERT_OK(err, "remount private /sys"))
- return err;
-
- err = umount2("/sys", MNT_DETACH);
- if (!ASSERT_OK(err, "umount2 /sys"))
- return err;
-
- err = mount("sysfs", "/sys", "sysfs", 0, NULL);
- if (!ASSERT_OK(err, "mount /sys"))
- return err;
-
- err = mount("bpffs", "/sys/fs/bpf", "bpf", 0, NULL);
- if (!ASSERT_OK(err, "mount /sys/fs/bpf"))
- return err;
-
- return 0;
-}
-
-/**
- * open_netns() - Switch to specified network namespace by name.
- *
- * Returns token with which to restore the original namespace
- * using close_netns().
- */
-static struct nstoken *open_netns(const char *name)
-{
- int nsfd;
- char nspath[PATH_MAX];
- int err;
- struct nstoken *token;
-
- token = malloc(sizeof(struct nstoken));
- if (!ASSERT_OK_PTR(token, "malloc token"))
- return NULL;
-
- token->orig_netns_fd = open("/proc/self/ns/net", O_RDONLY);
- if (!ASSERT_GE(token->orig_netns_fd, 0, "open /proc/self/ns/net"))
- goto fail;
-
- snprintf(nspath, sizeof(nspath), "%s/%s", "/var/run/netns", name);
- nsfd = open(nspath, O_RDONLY | O_CLOEXEC);
- if (!ASSERT_GE(nsfd, 0, "open netns fd"))
- goto fail;
-
- err = setns_by_fd(nsfd);
- if (!ASSERT_OK(err, "setns_by_fd"))
- goto fail;
-
- return token;
-fail:
- free(token);
- return NULL;
-}
-
-static void close_netns(struct nstoken *token)
-{
- ASSERT_OK(setns_by_fd(token->orig_netns_fd), "setns_by_fd");
- free(token);
-}
-
static int netns_setup_namespaces(const char *verb)
{
const char * const *ns = namespaces;
--
2.34.1
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