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Date: Mon, 15 Mar 2021 18:15:10 -0700
From: Martin KaFai Lau <kafai@...com>
To: <bpf@...r.kernel.org>
CC: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
<netdev@...r.kernel.org>
Subject: [PATCH bpf-next 15/15] bpf: selftest: Add kfunc_call test
This patch adds two kernel function bpf_kfunc_call_test[12]() for the
selftest's test_run purpose. They will be allowed for tc_cls prog.
The selftest calling the kernel function bpf_kfunc_call_test[12]()
is also added in this patch.
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
net/bpf/test_run.c | 11 ++++
net/core/filter.c | 11 ++++
.../selftests/bpf/prog_tests/kfunc_call.c | 61 +++++++++++++++++++
.../selftests/bpf/progs/kfunc_call_test.c | 48 +++++++++++++++
.../bpf/progs/kfunc_call_test_subprog.c | 31 ++++++++++
5 files changed, 162 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/kfunc_call.c
create mode 100644 tools/testing/selftests/bpf/progs/kfunc_call_test.c
create mode 100644 tools/testing/selftests/bpf/progs/kfunc_call_test_subprog.c
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 0abdd67f44b1..c1baab0c7d96 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -209,6 +209,17 @@ int noinline bpf_modify_return_test(int a, int *b)
*b += 1;
return a + *b;
}
+
+u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d)
+{
+ return a + b + c + d;
+}
+
+int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b)
+{
+ return a + b;
+}
+
__diag_pop();
ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);
diff --git a/net/core/filter.c b/net/core/filter.c
index 10dac9dd5086..605fbbdd694b 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -9799,12 +9799,23 @@ const struct bpf_prog_ops sk_filter_prog_ops = {
.test_run = bpf_prog_test_run_skb,
};
+BTF_SET_START(bpf_tc_cls_kfunc_ids)
+BTF_ID(func, bpf_kfunc_call_test1)
+BTF_ID(func, bpf_kfunc_call_test2)
+BTF_SET_END(bpf_tc_cls_kfunc_ids)
+
+static bool tc_cls_check_kern_func_call(u32 kfunc_id)
+{
+ return btf_id_set_contains(&bpf_tc_cls_kfunc_ids, kfunc_id);
+}
+
const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
.get_func_proto = tc_cls_act_func_proto,
.is_valid_access = tc_cls_act_is_valid_access,
.convert_ctx_access = tc_cls_act_convert_ctx_access,
.gen_prologue = tc_cls_act_prologue,
.gen_ld_abs = bpf_gen_ld_abs,
+ .check_kern_func_call = tc_cls_check_kern_func_call,
};
const struct bpf_prog_ops tc_cls_act_prog_ops = {
diff --git a/tools/testing/selftests/bpf/prog_tests/kfunc_call.c b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
new file mode 100644
index 000000000000..3850e6cc0a7d
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/kfunc_call.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include <test_progs.h>
+#include <network_helpers.h>
+#include "kfunc_call_test.skel.h"
+#include "kfunc_call_test_subprog.skel.h"
+
+static __u32 duration;
+
+static void test_main(void)
+{
+ struct kfunc_call_test *skel;
+ int prog_fd, retval, err;
+
+ skel = kfunc_call_test__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel"))
+ return;
+
+ prog_fd = bpf_program__fd(skel->progs.kfunc_call_test1);
+ err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
+ NULL, NULL, (__u32 *)&retval, &duration);
+
+ if (ASSERT_OK(err, "bpf_prog_test_run(test1)"))
+ ASSERT_EQ(retval, 12, "test1-retval");
+
+ prog_fd = bpf_program__fd(skel->progs.kfunc_call_test2);
+ err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
+ NULL, NULL, (__u32 *)&retval, &duration);
+ if (ASSERT_OK(err, "bpf_prog_test_run(test2)"))
+ ASSERT_EQ(retval, 3, "test2-retval");
+
+ kfunc_call_test__destroy(skel);
+}
+
+static void test_subprog(void)
+{
+ struct kfunc_call_test_subprog *skel;
+ int prog_fd, retval, err;
+
+ skel = kfunc_call_test_subprog__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel"))
+ return;
+
+ prog_fd = bpf_program__fd(skel->progs.kfunc_call_test1);
+ err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
+ NULL, NULL, (__u32 *)&retval, &duration);
+
+ if (ASSERT_OK(err, "bpf_prog_test_run(test1)"))
+ ASSERT_EQ(retval, 10, "test1-retval");
+
+ kfunc_call_test_subprog__destroy(skel);
+}
+
+void test_kfunc_call(void)
+{
+ if (test__start_subtest("main"))
+ test_main();
+
+ if (test__start_subtest("subprog"))
+ test_subprog();
+}
diff --git a/tools/testing/selftests/bpf/progs/kfunc_call_test.c b/tools/testing/selftests/bpf/progs/kfunc_call_test.c
new file mode 100644
index 000000000000..ea8c5266efd8
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/kfunc_call_test.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_tcp_helpers.h"
+
+extern __u64 bpf_kfunc_call_test1(struct sock *sk, __u32 a, __u64 b,
+ __u32 c, __u64 d) __ksym;
+extern int bpf_kfunc_call_test2(struct sock *sk, __u32 a, __u32 b) __ksym;
+
+SEC("classifier/test2")
+int kfunc_call_test2(struct __sk_buff *skb)
+{
+ struct bpf_sock *sk = skb->sk;
+
+ if (!sk)
+ return -1;
+
+ sk = bpf_sk_fullsock(sk);
+ if (!sk)
+ return -1;
+
+ return bpf_kfunc_call_test2((struct sock *)sk, 1, 2);
+}
+
+SEC("classifier/test1")
+int kfunc_call_test1(struct __sk_buff *skb)
+{
+ struct bpf_sock *sk = skb->sk;
+ __u64 a = 1ULL << 32;
+ __u32 ret;
+
+ if (!sk)
+ return -1;
+
+ sk = bpf_sk_fullsock(sk);
+ if (!sk)
+ return -1;
+
+ a = bpf_kfunc_call_test1((struct sock *)sk, 1, a | 2, 3, a | 4);
+
+ ret = a >> 32; /* ret should be 2 */
+ ret += (__u32)a; /* ret should be 12 */
+
+ return ret;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/kfunc_call_test_subprog.c b/tools/testing/selftests/bpf/progs/kfunc_call_test_subprog.c
new file mode 100644
index 000000000000..9bf66f8c826e
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/kfunc_call_test_subprog.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_tcp_helpers.h"
+
+extern __u64 bpf_kfunc_call_test1(struct sock *sk, __u32 a, __u64 b,
+ __u32 c, __u64 d) __ksym;
+
+__attribute__ ((noinline))
+int f1(struct __sk_buff *skb)
+{
+ struct bpf_sock *sk = skb->sk;
+
+ if (!sk)
+ return -1;
+
+ sk = bpf_sk_fullsock(sk);
+ if (!sk)
+ return -1;
+
+ return (__u32)bpf_kfunc_call_test1((struct sock *)sk, 1, 2, 3, 4);
+}
+
+SEC("classifier/test1_subprog")
+int kfunc_call_test1(struct __sk_buff *skb)
+{
+ return f1(skb);
+}
+
+char _license[] SEC("license") = "GPL";
--
2.30.2
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