selftests/bpf: Expand getsockname and getpeername tests

This expands coverage for getsockname and getpeername hooks to include
getsockname4, getsockname6, getpeername4, and getpeername6.

Signed-off-by: Jordan Rife <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

1 files changed, 31 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/progs/getpeername6_prog.c b/tools/testing/selftests/bpf/progs/getpeername6_prog.c
new file mode 100644
index 000000000000..070e4d7f636c
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/getpeername6_prog.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024 Google LLC */
+
+#include "vmlinux.h"
+
+#include <string.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+#include <bpf/bpf_core_read.h>
+#include "bpf_kfuncs.h"
+
+#define REWRITE_ADDRESS_IP6_0 0xfaceb00c
+#define REWRITE_ADDRESS_IP6_1 0x12345678
+#define REWRITE_ADDRESS_IP6_2 0x00000000
+#define REWRITE_ADDRESS_IP6_3 0x0000abcd
+
+#define REWRITE_ADDRESS_PORT6 6060
+
+SEC("cgroup/getpeername6")
+int getpeername_v6_prog(struct bpf_sock_addr *ctx)
+{
+	ctx->user_ip6[0] = bpf_htonl(REWRITE_ADDRESS_IP6_0);
+	ctx->user_ip6[1] = bpf_htonl(REWRITE_ADDRESS_IP6_1);
+	ctx->user_ip6[2] = bpf_htonl(REWRITE_ADDRESS_IP6_2);
+	ctx->user_ip6[3] = bpf_htonl(REWRITE_ADDRESS_IP6_3);
+	ctx->user_port = bpf_htons(REWRITE_ADDRESS_PORT6);
+
+	return 1;
+}
+
+char _license[] SEC("license") = "GPL";