1 files changed, 387 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
new file mode 100644
index 000000000..0aa088900
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
@@ -0,0 +1,387 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Cloudflare
+#include <error.h>
+#include <netinet/tcp.h>
+
+#include "test_progs.h"
+#include "test_skmsg_load_helpers.skel.h"
+#include "test_sockmap_update.skel.h"
+#include "test_sockmap_invalid_update.skel.h"
+#include "test_sockmap_skb_verdict_attach.skel.h"
+#include "test_sockmap_progs_query.skel.h"
+#include "bpf_iter_sockmap.skel.h"
+
+#define TCP_REPAIR		19	/* TCP sock is under repair right now */
+
+#define TCP_REPAIR_ON		1
+#define TCP_REPAIR_OFF_NO_WP	-1	/* Turn off without window probes */
+
+static int connected_socket_v4(void)
+{
+	struct sockaddr_in addr = {
+		.sin_family = AF_INET,
+		.sin_port = htons(80),
+		.sin_addr = { inet_addr("127.0.0.1") },
+	};
+	socklen_t len = sizeof(addr);
+	int s, repair, err;
+
+	s = socket(AF_INET, SOCK_STREAM, 0);
+	if (!ASSERT_GE(s, 0, "socket"))
+		goto error;
+
+	repair = TCP_REPAIR_ON;
+	err = setsockopt(s, SOL_TCP, TCP_REPAIR, &repair, sizeof(repair));
+	if (!ASSERT_OK(err, "setsockopt(TCP_REPAIR)"))
+		goto error;
+
+	err = connect(s, (struct sockaddr *)&addr, len);
+	if (!ASSERT_OK(err, "connect"))
+		goto error;
+
+	repair = TCP_REPAIR_OFF_NO_WP;
+	err = setsockopt(s, SOL_TCP, TCP_REPAIR, &repair, sizeof(repair));
+	if (!ASSERT_OK(err, "setsockopt(TCP_REPAIR)"))
+		goto error;
+
+	return s;
+error:
+	perror(__func__);
+	close(s);
+	return -1;
+}
+
+static void compare_cookies(struct bpf_map *src, struct bpf_map *dst)
+{
+	__u32 i, max_entries = bpf_map__max_entries(src);
+	int err, src_fd, dst_fd;
+
+	src_fd = bpf_map__fd(src);
+	dst_fd = bpf_map__fd(dst);
+
+	for (i = 0; i < max_entries; i++) {
+		__u64 src_cookie, dst_cookie;
+
+		err = bpf_map_lookup_elem(src_fd, &i, &src_cookie);
+		if (err && errno == ENOENT) {
+			err = bpf_map_lookup_elem(dst_fd, &i, &dst_cookie);
+			ASSERT_ERR(err, "map_lookup_elem(dst)");
+			ASSERT_EQ(errno, ENOENT, "map_lookup_elem(dst)");
+			continue;
+		}
+		if (!ASSERT_OK(err, "lookup_elem(src)"))
+			continue;
+
+		err = bpf_map_lookup_elem(dst_fd, &i, &dst_cookie);
+		if (!ASSERT_OK(err, "lookup_elem(dst)"))
+			continue;
+
+		ASSERT_EQ(dst_cookie, src_cookie, "cookie mismatch");
+	}
+}
+
+/* Create a map, populate it with one socket, and free the map. */
+static void test_sockmap_create_update_free(enum bpf_map_type map_type)
+{
+	const int zero = 0;
+	int s, map, err;
+
+	s = connected_socket_v4();
+	if (!ASSERT_GE(s, 0, "connected_socket_v4"))
+		return;
+
+	map = bpf_map_create(map_type, NULL, sizeof(int), sizeof(int), 1, NULL);
+	if (!ASSERT_GE(map, 0, "bpf_map_create"))
+		goto out;
+
+	err = bpf_map_update_elem(map, &zero, &s, BPF_NOEXIST);
+	if (!ASSERT_OK(err, "bpf_map_update"))
+		goto out;
+
+out:
+	close(map);
+	close(s);
+}
+
+static void test_skmsg_helpers(enum bpf_map_type map_type)
+{
+	struct test_skmsg_load_helpers *skel;
+	int err, map, verdict;
+
+	skel = test_skmsg_load_helpers__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "test_skmsg_load_helpers__open_and_load"))
+		return;
+
+	verdict = bpf_program__fd(skel->progs.prog_msg_verdict);
+	map = bpf_map__fd(skel->maps.sock_map);
+
+	err = bpf_prog_attach(verdict, map, BPF_SK_MSG_VERDICT, 0);
+	if (!ASSERT_OK(err, "bpf_prog_attach"))
+		goto out;
+
+	err = bpf_prog_detach2(verdict, map, BPF_SK_MSG_VERDICT);
+	if (!ASSERT_OK(err, "bpf_prog_detach2"))
+		goto out;
+out:
+	test_skmsg_load_helpers__destroy(skel);
+}
+
+static void test_sockmap_update(enum bpf_map_type map_type)
+{
+	int err, prog, src;
+	struct test_sockmap_update *skel;
+	struct bpf_map *dst_map;
+	const __u32 zero = 0;
+	char dummy[14] = {0};
+	LIBBPF_OPTS(bpf_test_run_opts, topts,
+		.data_in = dummy,
+		.data_size_in = sizeof(dummy),
+		.repeat = 1,
+	);
+	__s64 sk;
+
+	sk = connected_socket_v4();
+	if (!ASSERT_NEQ(sk, -1, "connected_socket_v4"))
+		return;
+
+	skel = test_sockmap_update__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "open_and_load"))
+		goto close_sk;
+
+	prog = bpf_program__fd(skel->progs.copy_sock_map);
+	src = bpf_map__fd(skel->maps.src);
+	if (map_type == BPF_MAP_TYPE_SOCKMAP)
+		dst_map = skel->maps.dst_sock_map;
+	else
+		dst_map = skel->maps.dst_sock_hash;
+
+	err = bpf_map_update_elem(src, &zero, &sk, BPF_NOEXIST);
+	if (!ASSERT_OK(err, "update_elem(src)"))
+		goto out;
+
+	err = bpf_prog_test_run_opts(prog, &topts);
+	if (!ASSERT_OK(err, "test_run"))
+		goto out;
+	if (!ASSERT_NEQ(topts.retval, 0, "test_run retval"))
+		goto out;
+
+	compare_cookies(skel->maps.src, dst_map);
+
+out:
+	test_sockmap_update__destroy(skel);
+close_sk:
+	close(sk);
+}
+
+static void test_sockmap_invalid_update(void)
+{
+	struct test_sockmap_invalid_update *skel;
+
+	skel = test_sockmap_invalid_update__open_and_load();
+	if (!ASSERT_NULL(skel, "open_and_load"))
+		test_sockmap_invalid_update__destroy(skel);
+}
+
+static void test_sockmap_copy(enum bpf_map_type map_type)
+{
+	DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
+	int err, len, src_fd, iter_fd;
+	union bpf_iter_link_info linfo = {};
+	__u32 i, num_sockets, num_elems;
+	struct bpf_iter_sockmap *skel;
+	__s64 *sock_fd = NULL;
+	struct bpf_link *link;
+	struct bpf_map *src;
+	char buf[64];
+
+	skel = bpf_iter_sockmap__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "bpf_iter_sockmap__open_and_load"))
+		return;
+
+	if (map_type == BPF_MAP_TYPE_SOCKMAP) {
+		src = skel->maps.sockmap;
+		num_elems = bpf_map__max_entries(src);
+		num_sockets = num_elems - 1;
+	} else {
+		src = skel->maps.sockhash;
+		num_elems = bpf_map__max_entries(src) - 1;
+		num_sockets = num_elems;
+	}
+
+	sock_fd = calloc(num_sockets, sizeof(*sock_fd));
+	if (!ASSERT_OK_PTR(sock_fd, "calloc(sock_fd)"))
+		goto out;
+
+	for (i = 0; i < num_sockets; i++)
+		sock_fd[i] = -1;
+
+	src_fd = bpf_map__fd(src);
+
+	for (i = 0; i < num_sockets; i++) {
+		sock_fd[i] = connected_socket_v4();
+		if (!ASSERT_NEQ(sock_fd[i], -1, "connected_socket_v4"))
+			goto out;
+
+		err = bpf_map_update_elem(src_fd, &i, &sock_fd[i], BPF_NOEXIST);
+		if (!ASSERT_OK(err, "map_update"))
+			goto out;
+	}
+
+	linfo.map.map_fd = src_fd;
+	opts.link_info = &linfo;
+	opts.link_info_len = sizeof(linfo);
+	link = bpf_program__attach_iter(skel->progs.copy, &opts);
+	if (!ASSERT_OK_PTR(link, "attach_iter"))
+		goto out;
+
+	iter_fd = bpf_iter_create(bpf_link__fd(link));
+	if (!ASSERT_GE(iter_fd, 0, "create_iter"))
+		goto free_link;
+
+	/* do some tests */
+	while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
+		;
+	if (!ASSERT_GE(len, 0, "read"))
+		goto close_iter;
+
+	/* test results */
+	if (!ASSERT_EQ(skel->bss->elems, num_elems, "elems"))
+		goto close_iter;
+
+	if (!ASSERT_EQ(skel->bss->socks, num_sockets, "socks"))
+		goto close_iter;
+
+	compare_cookies(src, skel->maps.dst);
+
+close_iter:
+	close(iter_fd);
+free_link:
+	bpf_link__destroy(link);
+out:
+	for (i = 0; sock_fd && i < num_sockets; i++)
+		if (sock_fd[i] >= 0)
+			close(sock_fd[i]);
+	if (sock_fd)
+		free(sock_fd);
+	bpf_iter_sockmap__destroy(skel);
+}
+
+static void test_sockmap_skb_verdict_attach(enum bpf_attach_type first,
+					    enum bpf_attach_type second)
+{
+	struct test_sockmap_skb_verdict_attach *skel;
+	int err, map, verdict;
+
+	skel = test_sockmap_skb_verdict_attach__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "open_and_load"))
+		return;
+
+	verdict = bpf_program__fd(skel->progs.prog_skb_verdict);
+	map = bpf_map__fd(skel->maps.sock_map);
+
+	err = bpf_prog_attach(verdict, map, first, 0);
+	if (!ASSERT_OK(err, "bpf_prog_attach"))
+		goto out;
+
+	err = bpf_prog_attach(verdict, map, second, 0);
+	ASSERT_EQ(err, -EBUSY, "prog_attach_fail");
+
+	err = bpf_prog_detach2(verdict, map, first);
+	if (!ASSERT_OK(err, "bpf_prog_detach2"))
+		goto out;
+out:
+	test_sockmap_skb_verdict_attach__destroy(skel);
+}
+
+static __u32 query_prog_id(int prog_fd)
+{
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	int err;
+
+	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
+	if (!ASSERT_OK(err, "bpf_obj_get_info_by_fd") ||
+	    !ASSERT_EQ(info_len, sizeof(info), "bpf_obj_get_info_by_fd"))
+		return 0;
+
+	return info.id;
+}
+
+static void test_sockmap_progs_query(enum bpf_attach_type attach_type)
+{
+	struct test_sockmap_progs_query *skel;
+	int err, map_fd, verdict_fd;
+	__u32 attach_flags = 0;
+	__u32 prog_ids[3] = {};
+	__u32 prog_cnt = 3;
+
+	skel = test_sockmap_progs_query__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "test_sockmap_progs_query__open_and_load"))
+		return;
+
+	map_fd = bpf_map__fd(skel->maps.sock_map);
+
+	if (attach_type == BPF_SK_MSG_VERDICT)
+		verdict_fd = bpf_program__fd(skel->progs.prog_skmsg_verdict);
+	else
+		verdict_fd = bpf_program__fd(skel->progs.prog_skb_verdict);
+
+	err = bpf_prog_query(map_fd, attach_type, 0 /* query flags */,
+			     &attach_flags, prog_ids, &prog_cnt);
+	ASSERT_OK(err, "bpf_prog_query failed");
+	ASSERT_EQ(attach_flags,  0, "wrong attach_flags on query");
+	ASSERT_EQ(prog_cnt, 0, "wrong program count on query");
+
+	err = bpf_prog_attach(verdict_fd, map_fd, attach_type, 0);
+	if (!ASSERT_OK(err, "bpf_prog_attach failed"))
+		goto out;
+
+	prog_cnt = 1;
+	err = bpf_prog_query(map_fd, attach_type, 0 /* query flags */,
+			     &attach_flags, prog_ids, &prog_cnt);
+	ASSERT_OK(err, "bpf_prog_query failed");
+	ASSERT_EQ(attach_flags, 0, "wrong attach_flags on query");
+	ASSERT_EQ(prog_cnt, 1, "wrong program count on query");
+	ASSERT_EQ(prog_ids[0], query_prog_id(verdict_fd),
+		  "wrong prog_ids on query");
+
+	bpf_prog_detach2(verdict_fd, map_fd, attach_type);
+out:
+	test_sockmap_progs_query__destroy(skel);
+}
+
+void test_sockmap_basic(void)
+{
+	if (test__start_subtest("sockmap create_update_free"))
+		test_sockmap_create_update_free(BPF_MAP_TYPE_SOCKMAP);
+	if (test__start_subtest("sockhash create_update_free"))
+		test_sockmap_create_update_free(BPF_MAP_TYPE_SOCKHASH);
+	if (test__start_subtest("sockmap sk_msg load helpers"))
+		test_skmsg_helpers(BPF_MAP_TYPE_SOCKMAP);
+	if (test__start_subtest("sockhash sk_msg load helpers"))
+		test_skmsg_helpers(BPF_MAP_TYPE_SOCKHASH);
+	if (test__start_subtest("sockmap update"))
+		test_sockmap_update(BPF_MAP_TYPE_SOCKMAP);
+	if (test__start_subtest("sockhash update"))
+		test_sockmap_update(BPF_MAP_TYPE_SOCKHASH);
+	if (test__start_subtest("sockmap update in unsafe context"))
+		test_sockmap_invalid_update();
+	if (test__start_subtest("sockmap copy"))
+		test_sockmap_copy(BPF_MAP_TYPE_SOCKMAP);
+	if (test__start_subtest("sockhash copy"))
+		test_sockmap_copy(BPF_MAP_TYPE_SOCKHASH);
+	if (test__start_subtest("sockmap skb_verdict attach")) {
+		test_sockmap_skb_verdict_attach(BPF_SK_SKB_VERDICT,
+						BPF_SK_SKB_STREAM_VERDICT);
+		test_sockmap_skb_verdict_attach(BPF_SK_SKB_STREAM_VERDICT,
+						BPF_SK_SKB_VERDICT);
+	}
+	if (test__start_subtest("sockmap msg_verdict progs query"))
+		test_sockmap_progs_query(BPF_SK_MSG_VERDICT);
+	if (test__start_subtest("sockmap stream_parser progs query"))
+		test_sockmap_progs_query(BPF_SK_SKB_STREAM_PARSER);
+	if (test__start_subtest("sockmap stream_verdict progs query"))
+		test_sockmap_progs_query(BPF_SK_SKB_STREAM_VERDICT);
+	if (test__start_subtest("sockmap skb_verdict progs query"))
+		test_sockmap_progs_query(BPF_SK_SKB_VERDICT);
+}