Use xt_bpf module to record the iface stats
To make interface packet accounting more accurately and persistent, the
xt_bpf module is implemented to record the total packets and bytes
tx/rx through each interface. The netd will load the bpf program and
set up iptable rules for the xt_bpf module at boot time and the
framework service will use them to get per interface networks stats on
supported devices. Add logcat support to bpfloader program.
Test: iface stats show up in maps. Iptable rules show up after boot.
Bug: 72111305
Change-Id: Ib33d2b165b64e130999931302dd67891c35a12e9
diff --git a/bpfloader/xt_bpf_ingress_prog.c b/bpfloader/xt_bpf_ingress_prog.c
new file mode 100644
index 0000000..f9852b2
--- /dev/null
+++ b/bpfloader/xt_bpf_ingress_prog.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <linux/bpf.h>
+#include <linux/if_ether.h>
+#include <linux/if_packet.h>
+#include <linux/ip.h>
+#include "bpf_kern.h"
+#include "bpf_shared.h"
+
+ELF_SEC(BPF_PROG_SEC_NAME)
+int xt_bpf_ingress_prog(struct __sk_buff* skb) {
+ return xt_bpf_count(skb, BPF_INGRESS);
+}