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ANDROID: vendor_hooks: Add vendor hook to the net

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android_vh_ptype_head:
    To add a debugging chain to ptype list

  android_vh_kfree_skb
    To sniff the dropped packet at kernel network

Bug: 163716381

Signed-off-by: Bae Soukjin <soukjin.bae@samsung.com>
Change-Id: Ide80bf0a129da31a1824d4a33026ac42be327361
(cherry picked from commit d88b2969cf)
(cherry picked from commit a8021ba684c584b8a4361d1680f6e466748ab012)
This commit is contained in:
Bae Soukjin
2020-08-19 08:30:51 +09:00
committed by Todd Kjos
parent 25edba0d4d
commit 2cff74e08c
5 changed files with 39 additions and 0 deletions
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3
drivers/android/vendor_hooks.c
View File

@@ -65,6 +65,7 @@
#include <trace/hooks/fips140.h>
#include <trace/hooks/remoteproc.h>
#include <trace/hooks/shmem_fs.h>
#include <trace/hooks/net.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@@ -343,3 +344,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_force_compatible_post);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_print_transaction_info);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_setscheduler_uclamp);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rproc_recovery);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ptype_head);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_kfree_skb);

25
include/trace/hooks/net.h Normal file
View File

@@ -0,0 +1,25 @@
/* 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;
struct sk_buff;
DECLARE_HOOK(android_vh_ptype_head,
TP_PROTO(const struct packet_type *pt, struct list_head *vendor_pt),
TP_ARGS(pt, vendor_pt));
DECLARE_HOOK(android_vh_kfree_skb,
TP_PROTO(struct sk_buff *skb), TP_ARGS(skb));
/* 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>

7
net/core/dev.c
View File

@@ -146,6 +146,7 @@
#include <net/devlink.h>
#include <linux/pm_runtime.h>
#include <linux/prandom.h>
#include <trace/hooks/net.h>
#include "net-sysfs.h"
@@ -510,6 +511,12 @@ 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

2
net/core/skbuff.c
View File

@@ -76,6 +76,7 @@
#include <linux/capability.h>
#include <linux/user_namespace.h>
#include <linux/indirect_call_wrapper.h>
#include <trace/hooks/net.h>
#include "datagram.h"
@@ -701,6 +702,7 @@ void kfree_skb(struct sk_buff *skb)
if (!skb_unref(skb))
return;
trace_android_vh_kfree_skb(skb);
trace_kfree_skb(skb, __builtin_return_address(0));
__kfree_skb(skb);
}

2
net/ipv4/tcp_input.c
View File

@@ -80,6 +80,7 @@
#include <linux/jump_label_ratelimit.h>
#include <net/busy_poll.h>
#include <net/mptcp.h>
#include <trace/hooks/net.h>
int sysctl_tcp_max_orphans __read_mostly = NR_FILE;
@@ -4618,6 +4619,7 @@ static bool tcp_ooo_try_coalesce(struct sock *sk,
static void tcp_drop(struct sock *sk, struct sk_buff *skb)
{
trace_android_vh_kfree_skb(skb);
sk_drops_add(sk, skb);
__kfree_skb(skb);
}