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selftests/bpf: Verify socket storage in cgroup/sock_{create, release}

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Augment udp_limit test to set and verify socket storage value.
That should be enough to exercise the changes from the previous
patch.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200729003104.1280813-2-sdf@google.com
This commit is contained in:
Stanislav Fomichev 2020-07-28 17:31:04 -07:00 • committed by Daniel Borkmann
parent f7c6cb1d97
commit 4fb5f94911
1 changed files with 19 additions and 0 deletions
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19
tools/testing/selftests/bpf/progs/udp_limit.c
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@ -6,14 +6,28 @@
int invocations = 0, in_use = 0;
struct {
__uint(type, BPF_MAP_TYPE_SK_STORAGE);
__uint(map_flags, BPF_F_NO_PREALLOC);
__type(key, int);
__type(value, int);
} sk_map SEC(".maps");
SEC("cgroup/sock_create")
int sock(struct bpf_sock *ctx)
{
int *sk_storage;
__u32 key;
if (ctx->type != SOCK_DGRAM)
return 1;
sk_storage = bpf_sk_storage_get(&sk_map, ctx, 0,
BPF_SK_STORAGE_GET_F_CREATE);
if (!sk_storage)
return 0;
*sk_storage = 0xdeadbeef;
__sync_fetch_and_add(&invocations, 1);
if (in_use > 0) {
@ -31,11 +45,16 @@ int sock(struct bpf_sock *ctx)
SEC("cgroup/sock_release")
int sock_release(struct bpf_sock *ctx)
{
int *sk_storage;
__u32 key;
if (ctx->type != SOCK_DGRAM)
return 1;
sk_storage = bpf_sk_storage_get(&sk_map, ctx, 0, 0);
if (!sk_storage || *sk_storage != 0xdeadbeef)
return 0;
__sync_fetch_and_add(&invocations, 1);
__sync_fetch_and_add(&in_use, -1);
return 1;