Covers all scenarios where classid can be retrieved with bpf.
./test_progs -a cgroup_get_classid
53/1 cgroup_get_classid/get classid from tc:OK
53/2 cgroup_get_classid/get classid from sysctl:OK
53/3 cgroup_get_classid/get classid from cgroup dev:OK
53/4 cgroup_get_classid/get classid from cgroup sockopt:OK
53 cgroup_get_classid:OK
Summary: 1/4 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Jiayuan Chen <jiayuan.c...@linux.dev>
---
.../selftests/bpf/prog_tests/cgroup_classid.c | 212 ++++++++++++++++++
.../selftests/bpf/progs/test_cgroup_classid.c | 51 +++++
2 files changed, 263 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/cgroup_classid.c
create mode 100644 tools/testing/selftests/bpf/progs/test_cgroup_classid.c
diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_classid.c
b/tools/testing/selftests/bpf/prog_tests/cgroup_classid.c
new file mode 100644
index 000000000000..f00da952e52c
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/cgroup_classid.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <test_progs.h>
+#include "cgroup_helpers.h"
+#include "network_helpers.h"
+#include "test_cgroup_classid.skel.h"
+
+#define TEST_CGROUP "/cgroup_classid"
+
+static int test_cgroup_get_classid_from_tc(int cgroup_fd, int srv_fd, int
srv_port, bool egress)
+{
+ struct test_cgroup_classid *skel;
+ int cli_fd = -1, ret = -1, expected;
+
+ LIBBPF_OPTS(bpf_tcx_opts, optl);
+
+ skel = test_cgroup_classid__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel_open"))
+ return ret;
+
+ skel->bss->classid = -1;
+ if (egress) {
+ expected = getpid();
+ skel->links.tc_egress =
+ bpf_program__attach_tcx(skel->progs.tc_egress, 1,
&optl);
+ } else {
+ expected = 0;
+ skel->links.tc_ingress =
+ bpf_program__attach_tcx(skel->progs.tc_ingress, 1,
&optl);
+ }
+
+ cli_fd = connect_to_fd_opts(srv_fd, NULL);
+ if (!ASSERT_GE(cli_fd, 0, "connect_to_fd_opts"))
+ goto out;
+
+ ASSERT_EQ(skel->bss->classid, expected, "classid mismatch");
+ ret = 0;
+out:
+ if (cli_fd > 0)
+ close(cli_fd);
+
+ test_cgroup_classid__destroy(skel);
+ return ret;
+}
+
+static void test_cgroup_get_classid_tc(void)
+{
+ int srv_fd = -1, srv_port = -1;
+ int cgroup_fd = -1;
+
+ setup_classid_environment();
+ set_classid();
+ join_classid();
+
+ cgroup_fd = open_classid();
+ if (!ASSERT_GE(cgroup_fd, 0, "open_classid"))
+ goto out;
+
+ srv_fd = start_server(AF_INET, SOCK_STREAM, NULL, 0, 0);
+ if (!ASSERT_GE(srv_fd, 0, "srv_fd"))
+ goto out;
+
+ srv_port = get_socket_local_port(srv_fd);
+ if (!ASSERT_GE(srv_port, 0, "get_socket_local_port"))
+ goto out;
+
+ ASSERT_OK(test_cgroup_get_classid_from_tc(cgroup_fd, srv_fd, srv_port,
1), "egress");
+ ASSERT_OK(test_cgroup_get_classid_from_tc(cgroup_fd, srv_fd, srv_port,
0), "ingress");
+out:
+ if (srv_fd > 0)
+ close(srv_fd);
+ if (cgroup_fd > 0)
+ close(cgroup_fd);
+ cleanup_classid_environment();
+}
+
+static void test_cgroup_get_classid_cgroup_dev(void)
+{
+ struct test_cgroup_classid *skel = NULL;
+ int cgroup_fd = -1;
+
+ cgroup_fd = test__join_cgroup(TEST_CGROUP);
+ if (!ASSERT_GE(cgroup_fd, 0, "join cgroup"))
+ goto out;
+
+ if (!ASSERT_OK(setup_classid_environment(), "setup env"))
+ goto out;
+
+ if (!ASSERT_OK(set_classid(), "set_classid"))
+ goto out;
+
+ skel = test_cgroup_classid__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "load program"))
+ goto out;
+
+ skel->links.cg_dev =
+ bpf_program__attach_cgroup(skel->progs.cg_dev, cgroup_fd);
+
+ if (!ASSERT_OK_PTR(skel->links.cg_dev, "attach_program"))
+ goto out;
+
+ skel->bss->classid = -1;
+ if (!ASSERT_OK(join_classid(), "join_classid"))
+ goto out;
+
+ open("/dev/null", O_RDWR);
+ ASSERT_EQ(skel->bss->classid, getpid(), "classid mismatch");
+out:
+ if (cgroup_fd > 0)
+ close(cgroup_fd);
+ test_cgroup_classid__destroy(skel);
+ cleanup_classid_environment();
+}
+
+static void test_cgroup_get_classid_sysctl(void)
+{
+ struct test_cgroup_classid *skel = NULL;
+ int cgroup_fd = -1;
+
+ cgroup_fd = test__join_cgroup(TEST_CGROUP);
+ if (!ASSERT_GE(cgroup_fd, 0, "join cgroup"))
+ goto out;
+
+ if (!ASSERT_OK(setup_classid_environment(), "setup env"))
+ goto out;
+
+ if (!ASSERT_OK(set_classid(), "set_classid"))
+ goto out;
+
+ skel = test_cgroup_classid__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "load program"))
+ goto out;
+
+ skel->links.sysctl_tcp_mem =
+ bpf_program__attach_cgroup(skel->progs.sysctl_tcp_mem,
cgroup_fd);
+ if (!ASSERT_OK_PTR(skel->links.sysctl_tcp_mem, "attach_program"))
+ goto out;
+
+ skel->bss->classid = -1;
+ if (!ASSERT_OK(join_classid(), "join_classid"))
+ goto out;
+
+ SYS_NOFAIL("cat /proc/sys/net/ipv4/tcp_mem");
+ ASSERT_EQ(skel->bss->classid, getpid(), "classid mismatch");
+out:
+ if (cgroup_fd > 0)
+ close(cgroup_fd);
+ test_cgroup_classid__destroy(skel);
+ cleanup_classid_environment();
+}
+
+static void test_cgroup_get_classid_sockopt(void)
+{
+ struct test_cgroup_classid *skel = NULL;
+ int cgroup_fd = -1, fd = -1, val, err;
+ socklen_t val_len;
+
+ cgroup_fd = test__join_cgroup(TEST_CGROUP);
+ if (!ASSERT_GE(cgroup_fd, 0, "join cgroup"))
+ goto out;
+
+ if (!ASSERT_OK(setup_classid_environment(), "setup env"))
+ goto out;
+
+ if (!ASSERT_OK(set_classid(), "set_classid"))
+ goto out;
+
+ skel = test_cgroup_classid__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "load program"))
+ goto out;
+
+ skel->links.cg_getsockopt =
+ bpf_program__attach_cgroup(skel->progs.cg_getsockopt,
cgroup_fd);
+ if (!ASSERT_OK_PTR(skel->links.cg_getsockopt, "attach_program"))
+ goto out;
+
+ skel->bss->classid = -1;
+ if (!ASSERT_OK(join_classid(), "join_classid"))
+ goto out;
+
+ fd = socket(AF_INET, SOCK_STREAM, 0);
+ if (!ASSERT_OK_FD(fd, "socket"))
+ goto out;
+
+ val_len = sizeof(val);
+ err = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, &val_len);
+ if (!ASSERT_OK(err, "getsockopt"))
+ goto out;
+
+ ASSERT_EQ(skel->bss->classid, getpid(), "classid mismatch");
+out:
+ if (fd > 0)
+ close(fd);
+ if (cgroup_fd > 0)
+ close(cgroup_fd);
+ test_cgroup_classid__destroy(skel);
+ cleanup_classid_environment();
+}
+
+void test_cgroup_get_classid(void)
+{
+ if (test__start_subtest("get classid from tc"))
+ test_cgroup_get_classid_tc();
+ if (test__start_subtest("get classid from sysctl"))
+ test_cgroup_get_classid_sysctl();
+ if (test__start_subtest("get classid from cgroup dev"))
+ test_cgroup_get_classid_cgroup_dev();
+ if (test__start_subtest("get classid from cgroup sockopt"))
+ test_cgroup_get_classid_sockopt();
+}
diff --git a/tools/testing/selftests/bpf/progs/test_cgroup_classid.c
b/tools/testing/selftests/bpf/progs/test_cgroup_classid.c
new file mode 100644
index 000000000000..7a555ba6bb17
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_cgroup_classid.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <sys/socket.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+
+int classid;
+
+SEC("tc/egress")
+int tc_egress(struct __sk_buff *skb)
+{
+ /* expecte real classid */
+ classid = bpf_get_cgroup_classid(skb);
+ return TCX_PASS;
+}
+
+SEC("tc/ingress")
+int tc_ingress(struct __sk_buff *skb)
+{
+ /* expecte 0 */
+ classid = bpf_get_cgroup_classid(skb);
+ return TCX_PASS;
+}
+
+SEC("cgroup/dev")
+int cg_dev(struct bpf_cgroup_dev_ctx *ctx)
+{
+ /* expecte real classid */
+ classid = bpf_get_cgroup_classid((struct __sk_buff *)ctx);
+ /* Allow all */
+ return 1;
+}
+
+SEC("cgroup/sysctl")
+int sysctl_tcp_mem(struct bpf_sysctl *ctx)
+{
+ /* expecte real classid */
+ classid = bpf_get_cgroup_classid((struct __sk_buff *)ctx);
+ return 1;
+}
+
+SEC("cgroup/getsockopt")
+int cg_getsockopt(struct bpf_sockopt *ctx)
+{
+ /* expecte real classid */
+ classid = bpf_get_cgroup_classid((struct __sk_buff *)ctx);
+ return 1;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.47.1
