android-mainline/NOUPSTREAM-ANDROID-net-NET-related-vendor-hooks.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Bae Soukjin <soukjin.bae@samsung.com>
Date: Wed, 19 Aug 2020 08:30:51 +0900
Subject: NOUPSTREAM: ANDROID: net: NET related vendor hooks

  android_vh_ptype_head:
    To add a debugging chain to ptype list

  android_vh_kfree_skb
    To sniff the dropped packet at kernel network

[CPNOTE: 04/08/21] Lee: Vendor hooks

Bug: 163716381

Signed-off-by: Bae Soukjin <soukjin.bae@samsung.com>
Change-Id: Ide80bf0a129da31a1824d4a33026ac42be327361
(cherry picked from commit d88b2969cfa78608ad4563e5f4fa84497cc0ffa6)
(cherry picked from commit a8021ba684c584b8a4361d1680f6e466748ab012)
Signed-off-by: Lee Jones <joneslee@google.com>
---
 include/trace/hooks/net.h | 22 ++++++++++++++++++++++
 net/core/dev.c            |  7 +++++++
 2 files changed, 29 insertions(+)
 create mode 100644 include/trace/hooks/net.h

diff --git a/include/trace/hooks/net.h b/include/trace/hooks/net.h
new file mode 100644
--- /dev/null
+++ b/include/trace/hooks/net.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM net
+#define TRACE_INCLUDE_PATH trace/hooks
+
+#if !defined(_TRACE_HOOK_NET_VH_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HOOK_NET_VH_H
+#include <linux/tracepoint.h>
+#include <trace/hooks/vendor_hooks.h>
+
+struct packet_type;
+struct list_head;
+DECLARE_HOOK(android_vh_ptype_head,
+	TP_PROTO(const struct packet_type *pt, struct list_head *vendor_pt),
+	TP_ARGS(pt, vendor_pt));
+
+/* macro versions of hooks are no longer required */
+
+#endif /* _TRACE_HOOK_NET_VH_H */
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/net/core/dev.c b/net/core/dev.c
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -150,6 +150,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/prandom.h>
 #include <linux/once_lite.h>
+#include <trace/hooks/net.h>
 
 #include "dev.h"
 #include "net-sysfs.h"
@@ -535,6 +536,12 @@ static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
 
 static inline struct list_head *ptype_head(const struct packet_type *pt)
 {
+	struct list_head vendor_pt = { .next  = NULL, };
+
+	trace_android_vh_ptype_head(pt, &vendor_pt);
+	if (vendor_pt.next)
+		return vendor_pt.next;
+
 	if (pt->type == htons(ETH_P_ALL))
 		return pt->dev ? &pt->dev->ptype_all : &ptype_all;
 	else