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authorHou Tao <houtao1@huawei.com>2021-10-25 14:40:24 +0800
committerAlexei Starovoitov <ast@kernel.org>2021-11-01 14:10:00 -0700
commitc196906d50e360d82ed9aa5596a9d0ce89b7ab78 (patch)
treeaf835ec8e400eed208337390b5c5d1ef2681b955 /kernel/bpf
parent35346ab64132d0f5919b06932d708c0d10360553 (diff)
downloadlinux-c196906d50e360d82ed9aa5596a9d0ce89b7ab78.tar.bz2
bpf: Add dummy BPF STRUCT_OPS for test purpose
Currently the test of BPF STRUCT_OPS depends on the specific bpf implementation of tcp_congestion_ops, but it can not cover all basic functionalities (e.g, return value handling), so introduce a dummy BPF STRUCT_OPS for test purpose. Loading a bpf_dummy_ops implementation from userspace is prohibited, and its only purpose is to run BPF_PROG_TYPE_STRUCT_OPS program through bpf(BPF_PROG_TEST_RUN). Now programs for test_1() & test_2() are supported. The following three cases are exercised in bpf_dummy_struct_ops_test_run(): (1) test and check the value returned from state arg in test_1(state) The content of state is copied from userspace pointer and copied back after calling test_1(state). The user pointer is saved in an u64 array and the array address is passed through ctx_in. (2) test and check the return value of test_1(NULL) Just simulate the case in which an invalid input argument is passed in. (3) test multiple arguments passing in test_2(state, ...) 5 arguments are passed through ctx_in in form of u64 array. The first element of array is userspace pointer of state and others 4 arguments follow. Signed-off-by: Hou Tao <houtao1@huawei.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20211025064025.2567443-4-houtao1@huawei.com
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/bpf_struct_ops.c3
-rw-r--r--kernel/bpf/bpf_struct_ops_types.h3
2 files changed, 6 insertions, 0 deletions
diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index 44be101f2562..8ecfe4752769 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -93,6 +93,9 @@ const struct bpf_verifier_ops bpf_struct_ops_verifier_ops = {
};
const struct bpf_prog_ops bpf_struct_ops_prog_ops = {
+#ifdef CONFIG_NET
+ .test_run = bpf_struct_ops_test_run,
+#endif
};
static const struct btf_type *module_type;
diff --git a/kernel/bpf/bpf_struct_ops_types.h b/kernel/bpf/bpf_struct_ops_types.h
index 066d83ea1c99..5678a9ddf817 100644
--- a/kernel/bpf/bpf_struct_ops_types.h
+++ b/kernel/bpf/bpf_struct_ops_types.h
@@ -2,6 +2,9 @@
/* internal file - do not include directly */
#ifdef CONFIG_BPF_JIT
+#ifdef CONFIG_NET
+BPF_STRUCT_OPS_TYPE(bpf_dummy_ops)
+#endif
#ifdef CONFIG_INET
#include <net/tcp.h>
BPF_STRUCT_OPS_TYPE(tcp_congestion_ops)