lkml.org 
[lkml]   [2020]   [Dec]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH bpf-next v5 6/6] selftests/bpf: Test bpf_sk_storage_get in tcp iterators
Date
This extends the existing bpf_sk_storage_get test where a socket is
created and tagged with its creator's pid by a task_file iterator.

A TCP iterator is now also used at the end of the test to negate the
values already stored in the local storage. The test therefore expects
-getpid() to be stored in the local storage.

Signed-off-by: Florent Revest <revest@google.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
---
.../selftests/bpf/prog_tests/bpf_iter.c | 18 ++++++++++++++++--
.../progs/bpf_iter_bpf_sk_storage_helpers.c | 18 ++++++++++++++++++
2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
index 9336d0f18331..0e586368948d 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
@@ -978,6 +978,8 @@ static void test_bpf_sk_storage_delete(void)
/* This creates a socket and its local storage. It then runs a task_iter BPF
* program that replaces the existing socket local storage with the tgid of the
* only task owning a file descriptor to this socket, this process, prog_tests.
+ * It then runs a tcp socket iterator that negates the value in the existing
+ * socket local storage, the test verifies that the resulting value is -pid.
*/
static void test_bpf_sk_storage_get(void)
{
@@ -994,6 +996,10 @@ static void test_bpf_sk_storage_get(void)
if (CHECK(sock_fd < 0, "socket", "errno: %d\n", errno))
goto out;

+ err = listen(sock_fd, 1);
+ if (CHECK(err != 0, "listen", "errno: %d\n", errno))
+ goto close_socket;
+
map_fd = bpf_map__fd(skel->maps.sk_stg_map);

err = bpf_map_update_elem(map_fd, &sock_fd, &val, BPF_NOEXIST);
@@ -1003,9 +1009,17 @@ static void test_bpf_sk_storage_get(void)
do_dummy_read(skel->progs.fill_socket_owner);

err = bpf_map_lookup_elem(map_fd, &sock_fd, &val);
- CHECK(err || val != getpid(), "bpf_map_lookup_elem",
+ if (CHECK(err || val != getpid(), "bpf_map_lookup_elem",
+ "map value wasn't set correctly (expected %d, got %d, err=%d)\n",
+ getpid(), val, err))
+ goto close_socket;
+
+ do_dummy_read(skel->progs.negate_socket_local_storage);
+
+ err = bpf_map_lookup_elem(map_fd, &sock_fd, &val);
+ CHECK(err || val != -getpid(), "bpf_map_lookup_elem",
"map value wasn't set correctly (expected %d, got %d, err=%d)\n",
- getpid(), val, err);
+ -getpid(), val, err);

close_socket:
close(sock_fd);
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_helpers.c b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_helpers.c
index dde53df37de8..6cecab2b32ba 100644
--- a/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_helpers.c
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_helpers.c
@@ -45,3 +45,21 @@ int fill_socket_owner(struct bpf_iter__task_file *ctx)

return 0;
}
+
+SEC("iter/tcp")
+int negate_socket_local_storage(struct bpf_iter__tcp *ctx)
+{
+ struct sock_common *sk_common = ctx->sk_common;
+ int *sock_tgid;
+
+ if (!sk_common)
+ return 0;
+
+ sock_tgid = bpf_sk_storage_get(&sk_stg_map, sk_common, 0, 0);
+ if (!sock_tgid)
+ return 0;
+
+ *sock_tgid = -*sock_tgid;
+
+ return 0;
+}
--
2.29.2.576.ga3fc446d84-goog
\
 
 \ /
  Last update: 2020-12-04 12:41    [W:0.064 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site