Add a test that exercises a basic sockmap / sockhash copy using bpf_iter.
Signed-off-by: Lorenz Bauer <lmb@xxxxxxxxxxxxxx>
---
.../selftests/bpf/prog_tests/sockmap_basic.c | 78 +++++++++++++++++++
tools/testing/selftests/bpf/progs/bpf_iter.h | 9 +++
.../selftests/bpf/progs/bpf_iter_sockmap.c | 50 ++++++++++++
3 files changed, 137 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_sockmap.c
diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
index b989f8760f1a..386aecf1f7ff 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
@@ -6,6 +6,7 @@
#include "test_skmsg_load_helpers.skel.h"
#include "test_sockmap_update.skel.h"
#include "test_sockmap_invalid_update.skel.h"
+#include "bpf_iter_sockmap.skel.h"
#define TCP_REPAIR 19 /* TCP sock is under repair right now */
@@ -194,6 +195,79 @@ static void test_sockmap_invalid_update(void)
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, i, len, src_fd, iter_fd, num_sockets, duration;
+ struct bpf_iter_sockmap *skel;
+ struct bpf_map *src, *dst;
+ union bpf_iter_link_info linfo = {0};
+ __s64 sock_fd[2] = {-1, -1};
+ struct bpf_link *link;
+ char buf[64];
+ __u32 max_elems;
+
+ skel = bpf_iter_sockmap__open_and_load();
+ if (CHECK(!skel, "bpf_iter_sockmap__open_and_load",
+ "skeleton open_and_load failed\n"))
+ return;
+
+ if (map_type == BPF_MAP_TYPE_SOCKMAP)
+ src = skel->maps.sockmap;
+ else
+ src = skel->maps.sockhash;
+
+ dst = skel->maps.dst;
+ src_fd = bpf_map__fd(src);
+ max_elems = bpf_map__max_entries(src);
+
+ num_sockets = ARRAY_SIZE(sock_fd);
+ for (i = 0; i < num_sockets; i++) {
+ sock_fd[i] = connected_socket_v4();
+ if (CHECK(sock_fd[i] == -1, "connected_socket_v4", "cannot connect\n"))
+ goto out;
+
+ err = bpf_map_update_elem(src_fd, &i, &sock_fd[i], BPF_NOEXIST);
+ if (CHECK(err, "map_update", "map_update failed\n"))
+ 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_sockmap, &opts);
+ if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
+ goto out;
+
+ iter_fd = bpf_iter_create(bpf_link__fd(link));
+ if (CHECK(iter_fd < 0, "create_iter", "create_iter failed\n"))
+ goto free_link;
+
+ /* do some tests */
+ while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
+ ;
+ if (CHECK(len < 0, "read", "failed: %s\n", strerror(errno)))
+ goto close_iter;
+
+ /* test results */
+ if (CHECK(skel->bss->elems != max_elems, "elems", "got %u expected %u\n",
+ skel->bss->elems, max_elems))
+ goto close_iter;
+
+ compare_cookies(src, dst);
+
+close_iter:
+ close(iter_fd);
+free_link:
+ bpf_link__destroy(link);
+out:
+ for (i = 0; i < num_sockets; i++) {
+ if (sock_fd[i] >= 0)
+ close(sock_fd[i]);
+ }
+ bpf_iter_sockmap__destroy(skel);
+}
+
void test_sockmap_basic(void)
{
if (test__start_subtest("sockmap create_update_free"))
@@ -210,4 +284,8 @@ void test_sockmap_basic(void)
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);
}
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter.h b/tools/testing/selftests/bpf/progs/bpf_iter.h
index c196280df90d..ac32a29f5153 100644
--- a/tools/testing/selftests/bpf/progs/bpf_iter.h
+++ b/tools/testing/selftests/bpf/progs/bpf_iter.h
@@ -13,6 +13,7 @@
#define udp6_sock udp6_sock___not_used
#define bpf_iter__bpf_map_elem bpf_iter__bpf_map_elem___not_used
#define bpf_iter__bpf_sk_storage_map bpf_iter__bpf_sk_storage_map___not_used
+#define bpf_iter__sockmap bpf_iter__sockmap___not_used
#include "vmlinux.h"
#undef bpf_iter_meta
#undef bpf_iter__bpf_map
@@ -26,6 +27,7 @@
#undef udp6_sock
#undef bpf_iter__bpf_map_elem
#undef bpf_iter__bpf_sk_storage_map
+#undef bpf_iter__sockmap
struct bpf_iter_meta {
struct seq_file *seq;
@@ -96,3 +98,10 @@ struct bpf_iter__bpf_sk_storage_map {
struct sock *sk;
void *value;
};
+
+struct bpf_iter__sockmap {
+ struct bpf_iter_meta *meta;
+ struct bpf_map *map;
+ void *key;
+ struct bpf_sock *sk;
+};
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_sockmap.c b/tools/testing/selftests/bpf/progs/bpf_iter_sockmap.c
new file mode 100644
index 000000000000..1b4268c9cd31
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_sockmap.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Cloudflare */
+#include "bpf_iter.h"
+#include "bpf_tracing_net.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+struct {
+ __uint(type, BPF_MAP_TYPE_SOCKMAP);
+ __uint(max_entries, 3);
+ __type(key, __u32);
+ __type(value, __u64);
+} sockmap SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_SOCKMAP);
+ __uint(max_entries, 3);
+ __type(key, __u32);
+ __type(value, __u64);
+} sockhash SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_SOCKHASH);
+ __uint(max_entries, 3);
+ __type(key, __u32);
+ __type(value, __u64);
+} dst SEC(".maps");
+
+__u32 elems = 0;
+
+SEC("iter/sockmap")
+int copy_sockmap(struct bpf_iter__sockmap *ctx)
+{
+ __u32 tmp, *key = ctx->key;
+ struct bpf_sock *sk = ctx->sk;
+
+ if (key == (void *)0)
+ return 0;
+
+ elems++;
+ tmp = *key;
+
+ if (sk != (void *)0)
+ return bpf_map_update_elem(&dst, &tmp, sk, 0) != 0;
+
+ bpf_map_delete_elem(&dst, &tmp);
+ return 0;
+}
--
2.25.1
