netdev - [PATCH net-next v4 1/2] trace: adjust TP_STORE_ADDR_PORTS

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Date: Mon,  1 Apr 2024 15:36:04 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: edumazet@...gle.com,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com,
	rostedt@...dmis.org,
	kuba@...nel.org,
	pabeni@...hat.com,
	davem@...emloft.net
Cc: netdev@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	kerneljasonxing@...il.com,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next v4 1/2] trace: adjust TP_STORE_ADDR_PORTS_SKB() parameters

From: Jason Xing <kernelxing@...cent.com>

Introducing entry_saddr and entry_daddr parameters in this macro
for later use can help us record the reverse 4-tuple by analyzing
the 4-tuple of the incoming skb when receiving.

Signed-off-by: Jason Xing <kernelxing@...cent.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
---
 include/trace/events/net_probe_common.h | 20 +++++++++++---------
 include/trace/events/tcp.h              |  2 +-
 include/trace/events/udp.h              |  2 +-
 3 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/include/trace/events/net_probe_common.h b/include/trace/events/net_probe_common.h
index 5e33f91bdea3..976a58364bff 100644
--- a/include/trace/events/net_probe_common.h
+++ b/include/trace/events/net_probe_common.h
@@ -70,14 +70,14 @@
 	TP_STORE_V4MAPPED(__entry, saddr, daddr)
 #endif
 
-#define TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb, protoh)		\
+#define TP_STORE_ADDR_PORTS_SKB_V4(skb, protoh, entry_saddr, entry_daddr) \
 	do {								\
-		struct sockaddr_in *v4 = (void *)__entry->saddr;	\
+		struct sockaddr_in *v4 = (void *)entry_saddr;		\
 									\
 		v4->sin_family = AF_INET;				\
 		v4->sin_port = protoh->source;				\
 		v4->sin_addr.s_addr = ip_hdr(skb)->saddr;		\
-		v4 = (void *)__entry->daddr;				\
+		v4 = (void *)entry_daddr;				\
 		v4->sin_family = AF_INET;				\
 		v4->sin_port = protoh->dest;				\
 		v4->sin_addr.s_addr = ip_hdr(skb)->daddr;		\
@@ -85,28 +85,30 @@
 
 #if IS_ENABLED(CONFIG_IPV6)
 
-#define TP_STORE_ADDR_PORTS_SKB(__entry, skb, protoh)			\
+#define TP_STORE_ADDR_PORTS_SKB(skb, protoh, entry_saddr, entry_daddr)	\
 	do {								\
 		const struct iphdr *iph = ip_hdr(skb);			\
 									\
 		if (iph->version == 6) {				\
-			struct sockaddr_in6 *v6 = (void *)__entry->saddr; \
+			struct sockaddr_in6 *v6 = (void *)entry_saddr;	\
 									\
 			v6->sin6_family = AF_INET6;			\
 			v6->sin6_port = protoh->source;			\
 			v6->sin6_addr = ipv6_hdr(skb)->saddr;		\
-			v6 = (void *)__entry->daddr;			\
+			v6 = (void *)entry_daddr;			\
 			v6->sin6_family = AF_INET6;			\
 			v6->sin6_port = protoh->dest;			\
 			v6->sin6_addr = ipv6_hdr(skb)->daddr;		\
 		} else							\
-			TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb, protoh); \
+			TP_STORE_ADDR_PORTS_SKB_V4(skb, protoh,		\
+						   entry_saddr,		\
+						   entry_daddr);	\
 	} while (0)
 
 #else
 
-#define TP_STORE_ADDR_PORTS_SKB(__entry, skb, protoh)		\
-	TP_STORE_ADDR_PORTS_SKB_V4(__entry, skb, protoh)
+#define TP_STORE_ADDR_PORTS_SKB(skb, protoh, entry_saddr, entry_daddr)	\
+	TP_STORE_ADDR_PORTS_SKB_V4(skb, protoh, entry_saddr, entry_daddr)
 
 #endif
 
diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
index 1db95175c1e5..cf14b6fcbeed 100644
--- a/include/trace/events/tcp.h
+++ b/include/trace/events/tcp.h
@@ -295,7 +295,7 @@ DECLARE_EVENT_CLASS(tcp_event_skb,
 		memset(__entry->saddr, 0, sizeof(struct sockaddr_in6));
 		memset(__entry->daddr, 0, sizeof(struct sockaddr_in6));
 
-		TP_STORE_ADDR_PORTS_SKB(__entry, skb, th);
+		TP_STORE_ADDR_PORTS_SKB(skb, th, __entry->saddr, __entry->daddr);
 	),
 
 	TP_printk("skbaddr=%p src=%pISpc dest=%pISpc",
diff --git a/include/trace/events/udp.h b/include/trace/events/udp.h
index 62bebe2a6ece..6142be4068e2 100644
--- a/include/trace/events/udp.h
+++ b/include/trace/events/udp.h
@@ -38,7 +38,7 @@ TRACE_EVENT(udp_fail_queue_rcv_skb,
 		memset(__entry->saddr, 0, sizeof(struct sockaddr_in6));
 		memset(__entry->daddr, 0, sizeof(struct sockaddr_in6));
 
-		TP_STORE_ADDR_PORTS_SKB(__entry, skb, uh);
+		TP_STORE_ADDR_PORTS_SKB(skb, uh, __entry->saddr, __entry->daddr);
 	),
 
 	TP_printk("rc=%d family=%s src=%pISpc dest=%pISpc", __entry->rc,
-- 
2.37.3