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Date: Thu, 20 Aug 2020 14:57:29 +0100
From: Lorenz Bauer <lmb@...udflare.com>
To: jakub@...udflare.com, john.fastabend@...il.com,
Shuah Khan <shuah@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>
Cc: kernel-team@...udflare.com, Lorenz Bauer <lmb@...udflare.com>,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH bpf-next v2 6/6] selftests: bpf: test sockmap update from BPF
Add a test which copies a socket from a sockmap into another sockmap
or sockhash. This excercises bpf_map_update_elem support from BPF
context. Compare the socket cookies from source and destination to
ensure that the copy succeeded.
Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
---
.../selftests/bpf/prog_tests/sockmap_basic.c | 71 +++++++++++++++++++
.../selftests/bpf/progs/test_sockmap_copy.c | 48 +++++++++++++
2 files changed, 119 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_copy.c
diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
index 96e7b7f84c65..cd05ff5e88e1 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
@@ -4,6 +4,7 @@
#include "test_progs.h"
#include "test_skmsg_load_helpers.skel.h"
+#include "test_sockmap_copy.skel.h"
#define TCP_REPAIR 19 /* TCP sock is under repair right now */
@@ -101,6 +102,72 @@ static void test_skmsg_helpers(enum bpf_map_type map_type)
test_skmsg_load_helpers__destroy(skel);
}
+static void test_sockmap_copy(enum bpf_map_type map_type)
+{
+ struct bpf_prog_test_run_attr tattr;
+ struct test_sockmap_copy *skel;
+ __u64 src_cookie, dst_cookie;
+ int err, prog, src, dst;
+ const __u32 zero = 0;
+ char dummy[14] = {0};
+ __s64 sk;
+
+ sk = connected_socket_v4();
+ if (CHECK_FAIL(sk == -1))
+ return;
+
+ skel = test_sockmap_copy__open_and_load();
+ if (CHECK_FAIL(!skel)) {
+ close(sk);
+ perror("test_sockmap_copy__open_and_load");
+ return;
+ }
+
+ prog = bpf_program__fd(skel->progs.copy_sock_map);
+ src = bpf_map__fd(skel->maps.src);
+ if (map_type == BPF_MAP_TYPE_SOCKMAP)
+ dst = bpf_map__fd(skel->maps.dst_sock_map);
+ else
+ dst = bpf_map__fd(skel->maps.dst_sock_hash);
+
+ err = bpf_map_update_elem(src, &zero, &sk, BPF_NOEXIST);
+ if (CHECK_FAIL(err)) {
+ perror("bpf_map_update");
+ goto out;
+ }
+
+ err = bpf_map_lookup_elem(src, &zero, &src_cookie);
+ if (CHECK_FAIL(err)) {
+ perror("bpf_map_lookup_elem(src)");
+ goto out;
+ }
+
+ tattr = (struct bpf_prog_test_run_attr){
+ .prog_fd = prog,
+ .repeat = 1,
+ .data_in = dummy,
+ .data_size_in = sizeof(dummy),
+ };
+
+ err = bpf_prog_test_run_xattr(&tattr);
+ if (CHECK_ATTR(err || !tattr.retval, "bpf_prog_test_run",
+ "errno=%u retval=%u\n", errno, tattr.retval))
+ goto out;
+
+ err = bpf_map_lookup_elem(dst, &zero, &dst_cookie);
+ if (CHECK_FAIL(err)) {
+ perror("bpf_map_lookup_elem(dst)");
+ goto out;
+ }
+
+ if (dst_cookie != src_cookie)
+ PRINT_FAIL("cookie %llu != %llu\n", dst_cookie, src_cookie);
+
+out:
+ close(sk);
+ test_sockmap_copy__destroy(skel);
+}
+
void test_sockmap_basic(void)
{
if (test__start_subtest("sockmap create_update_free"))
@@ -111,4 +178,8 @@ void test_sockmap_basic(void)
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 copy"))
+ test_sockmap_copy(BPF_MAP_TYPE_SOCKMAP);
+ if (test__start_subtest("sockhash copy"))
+ test_sockmap_copy(BPF_MAP_TYPE_SOCKHASH);
}
diff --git a/tools/testing/selftests/bpf/progs/test_sockmap_copy.c b/tools/testing/selftests/bpf/progs/test_sockmap_copy.c
new file mode 100644
index 000000000000..9d0c9f28cab2
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_sockmap_copy.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Cloudflare
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+
+struct {
+ __uint(type, BPF_MAP_TYPE_SOCKMAP);
+ __uint(max_entries, 1);
+ __type(key, __u32);
+ __type(value, __u64);
+} src SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_SOCKMAP);
+ __uint(max_entries, 1);
+ __type(key, __u32);
+ __type(value, __u64);
+} dst_sock_map SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_SOCKHASH);
+ __uint(max_entries, 1);
+ __type(key, __u32);
+ __type(value, __u64);
+} dst_sock_hash SEC(".maps");
+
+SEC("classifier/copy_sock_map")
+int copy_sock_map(void *ctx)
+{
+ struct bpf_sock *sk;
+ bool failed = false;
+ __u32 key = 0;
+
+ sk = bpf_map_lookup_elem(&src, &key);
+ if (!sk)
+ return SK_DROP;
+
+ if (bpf_map_update_elem(&dst_sock_map, &key, sk, 0))
+ failed = true;
+
+ if (bpf_map_update_elem(&dst_sock_hash, &key, sk, 0))
+ failed = true;
+
+ bpf_sk_release(sk);
+ return failed ? SK_DROP : SK_PASS;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.25.1
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