1 files changed, 256 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/sock_create.c b/tools/testing/selftests/bpf/prog_tests/sock_create.c
new file mode 100644
index 000000000000..072910c05c99
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/sock_create.c
@@ -0,0 +1,256 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <test_progs.h>
+#include "cgroup_helpers.h"
+
+static char bpf_log_buf[4096];
+static bool verbose;
+
+static struct sock_create_test {
+	const char			*descr;
+	const struct bpf_insn		insns[64];
+	enum bpf_attach_type		attach_type;
+	enum bpf_attach_type		expected_attach_type;
+
+	int				domain;
+	int				type;
+
+	int				optname;
+	int				optval;
+} tests[] = {
+	{
+		.descr = "AF_INET set priority",
+		.insns = {
+			/* r3 = 123 (priority) */
+			BPF_MOV64_IMM(BPF_REG_3, 123),
+			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
+				    offsetof(struct bpf_sock, priority)),
+
+			/* return 1 */
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+		},
+		.expected_attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+		.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+
+		.domain = AF_INET,
+		.type = SOCK_DGRAM,
+
+		.optname = SO_PRIORITY,
+		.optval = 123,
+	},
+	{
+		.descr = "AF_INET6 set priority",
+		.insns = {
+			/* r3 = 123 (priority) */
+			BPF_MOV64_IMM(BPF_REG_3, 123),
+			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
+				    offsetof(struct bpf_sock, priority)),
+
+			/* return 1 */
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+		},
+		.expected_attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+		.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+
+		.domain = AF_INET6,
+		.type = SOCK_DGRAM,
+
+		.optname = SO_PRIORITY,
+		.optval = 123,
+	},
+	{
+		.descr = "AF_INET set mark",
+		.insns = {
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+
+			/* get uid of process */
+			BPF_EMIT_CALL(BPF_FUNC_get_current_uid_gid),
+			BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 0xffffffff),
+
+			/* if uid is 0, use given mark(666), else use uid as the mark */
+			BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+			BPF_MOV64_IMM(BPF_REG_3, 666),
+
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
+				    offsetof(struct bpf_sock, mark)),
+
+			/* return 1 */
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+		},
+		.expected_attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+		.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+
+		.domain = AF_INET,
+		.type = SOCK_DGRAM,
+
+		.optname = SO_MARK,
+		.optval = 666,
+	},
+	{
+		.descr = "AF_INET6 set mark",
+		.insns = {
+			BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+
+			/* get uid of process */
+			BPF_EMIT_CALL(BPF_FUNC_get_current_uid_gid),
+			BPF_ALU64_IMM(BPF_AND, BPF_REG_0, 0xffffffff),
+
+			/* if uid is 0, use given mark(666), else use uid as the mark */
+			BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
+			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+			BPF_MOV64_IMM(BPF_REG_3, 666),
+
+			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
+				    offsetof(struct bpf_sock, mark)),
+
+			/* return 1 */
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+		},
+		.expected_attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+		.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+
+		.domain = AF_INET6,
+		.type = SOCK_DGRAM,
+
+		.optname = SO_MARK,
+		.optval = 666,
+	},
+	{
+		.descr = "AF_INET bound to iface",
+		.insns = {
+			/* r3 = 1 (lo interface) */
+			BPF_MOV64_IMM(BPF_REG_3, 1),
+			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
+				    offsetof(struct bpf_sock, bound_dev_if)),
+
+			/* return 1 */
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+		},
+		.expected_attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+		.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+
+		.domain = AF_INET,
+		.type = SOCK_DGRAM,
+
+		.optname = SO_BINDTOIFINDEX,
+		.optval = 1,
+	},
+	{
+		.descr = "AF_INET6 bound to iface",
+		.insns = {
+			/* r3 = 1 (lo interface) */
+			BPF_MOV64_IMM(BPF_REG_3, 1),
+			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_3,
+				    offsetof(struct bpf_sock, bound_dev_if)),
+
+			/* return 1 */
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_EXIT_INSN(),
+		},
+		.expected_attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+		.attach_type = BPF_CGROUP_INET_SOCK_CREATE,
+
+		.domain = AF_INET6,
+		.type = SOCK_DGRAM,
+
+		.optname = SO_BINDTOIFINDEX,
+		.optval = 1,
+	},
+};
+
+static int load_prog(const struct bpf_insn *insns,
+		     enum bpf_attach_type expected_attach_type)
+{
+	LIBBPF_OPTS(bpf_prog_load_opts, opts,
+		    .expected_attach_type = expected_attach_type,
+		    .log_level = 2,
+		    .log_buf = bpf_log_buf,
+		    .log_size = sizeof(bpf_log_buf),
+	);
+	int fd, insns_cnt = 0;
+
+	for (;
+	     insns[insns_cnt].code != (BPF_JMP | BPF_EXIT);
+	     insns_cnt++) {
+	}
+	insns_cnt++;
+
+	fd = bpf_prog_load(BPF_PROG_TYPE_CGROUP_SOCK, NULL, "GPL", insns,
+			   insns_cnt, &opts);
+	if (verbose && fd < 0)
+		fprintf(stderr, "%s\n", bpf_log_buf);
+
+	return fd;
+}
+
+static int run_test(int cgroup_fd, struct sock_create_test *test)
+{
+	int sock_fd, err, prog_fd, optval, ret = -1;
+	socklen_t optlen = sizeof(optval);
+
+	prog_fd = load_prog(test->insns, test->expected_attach_type);
+	if (prog_fd < 0) {
+		log_err("Failed to load BPF program");
+		return -1;
+	}
+
+	err = bpf_prog_attach(prog_fd, cgroup_fd, test->attach_type, 0);
+	if (err < 0) {
+		log_err("Failed to attach BPF program");
+		goto close_prog_fd;
+	}
+
+	sock_fd = socket(test->domain, test->type, 0);
+	if (sock_fd < 0) {
+		log_err("Failed to create socket");
+		goto detach_prog;
+	}
+
+	err = getsockopt(sock_fd, SOL_SOCKET, test->optname, &optval, &optlen);
+	if (err) {
+		log_err("Failed to call getsockopt");
+		goto cleanup;
+	}
+
+	if (optval != test->optval) {
+		errno = 0;
+		log_err("getsockopt returned unexpected optval");
+		goto cleanup;
+	}
+
+	ret = 0;
+
+cleanup:
+	close(sock_fd);
+detach_prog:
+	bpf_prog_detach2(prog_fd, cgroup_fd, test->attach_type);
+close_prog_fd:
+	close(prog_fd);
+	return ret;
+}
+
+void test_sock_create(void)
+{
+	int cgroup_fd, i;
+
+	cgroup_fd = test__join_cgroup("/sock_create");
+	if (!ASSERT_GE(cgroup_fd, 0, "join_cgroup"))
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(tests); i++) {
+		if (!test__start_subtest(tests[i].descr))
+			continue;
+
+		ASSERT_OK(run_test(cgroup_fd, &tests[i]), tests[i].descr);
+	}
+
+	close(cgroup_fd);
+}