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From: menglong8.dong@gmail.com
To: edumazet@google.com
Cc: rostedt@goodmis.org, mingo@redhat.com, davem@davemloft.net,
	yoshfuji@linux-ipv6.org, dsahern@kernel.org, kuba@kernel.org,
	pabeni@redhat.com, imagedong@tencent.com, kafai@fb.com,
	talalahmad@google.com, keescook@chromium.org,
	dongli.zhang@oracle.com, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org, Jiang Biao <benbjiang@tencent.com>,
	Hao Peng <flyingpeng@tencent.com>
Subject: [PATCH net-next v2 9/9] net: tcp: add skb drop reasons to route_req()
Date: Tue, 17 May 2022 16:10:08 +0800	[thread overview]
Message-ID: <20220517081008.294325-10-imagedong@tencent.com> (raw)
In-Reply-To: <20220517081008.294325-1-imagedong@tencent.com>

From: Menglong Dong <imagedong@tencent.com>

Add skb drop reasons to the route_req() in struct tcp_request_sock_ops.
Following functions are involved:

  tcp_v4_route_req()
  tcp_v6_route_req()
  subflow_v4_route_req()
  subflow_v6_route_req()

And the new reason SKB_DROP_REASON_LSM is added, which is used when
skb is dropped by LSM.

Reviewed-by: Jiang Biao <benbjiang@tencent.com>
Reviewed-by: Hao Peng <flyingpeng@tencent.com>
Signed-off-by: Menglong Dong <imagedong@tencent.com>
---
 include/linux/skbuff.h |  4 ++++
 include/net/tcp.h      |  3 ++-
 net/ipv4/tcp_input.c   |  2 +-
 net/ipv4/tcp_ipv4.c    | 14 +++++++++++---
 net/ipv6/tcp_ipv6.c    | 14 +++++++++++---
 net/mptcp/subflow.c    | 10 ++++++----
 6 files changed, 35 insertions(+), 12 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 8d18fc5a5af6..fdfe54dc5ae4 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -564,6 +564,9 @@ struct sk_buff;
  * SKB_DROP_REASON_TIMEWAIT
  *	socket is in time-wait state and all packet that received will
  *	be treated as 'drop', except a good 'SYN' packet
+ *
+ * SKB_DROP_REASON_LSM
+ *	dropped by LSM
  */
 #define __DEFINE_SKB_DROP_REASON(FN)	\
 	FN(NOT_SPECIFIED)		\
@@ -636,6 +639,7 @@ struct sk_buff;
 	FN(LISTENOVERFLOWS)		\
 	FN(TCP_REQQFULLDROP)		\
 	FN(TIMEWAIT)			\
+	FN(LSM)				\
 	FN(MAX)
 
 /* The reason of skb drop, which is used in kfree_skb_reason().
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 88217b8d95ac..ed57c331fdeb 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2075,7 +2075,8 @@ struct tcp_request_sock_ops {
 	struct dst_entry *(*route_req)(const struct sock *sk,
 				       struct sk_buff *skb,
 				       struct flowi *fl,
-				       struct request_sock *req);
+				       struct request_sock *req,
+				       enum skb_drop_reason *reason);
 	u32 (*init_seq)(const struct sk_buff *skb);
 	u32 (*init_ts_off)(const struct net *net, const struct sk_buff *skb);
 	int (*send_synack)(const struct sock *sk, struct dst_entry *dst,
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index be6275c56b59..146d22b05186 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6950,7 +6950,7 @@ enum skb_drop_reason tcp_conn_request(struct request_sock_ops *rsk_ops,
 	/* Note: tcp_v6_init_req() might override ir_iif for link locals */
 	inet_rsk(req)->ir_iif = inet_request_bound_dev_if(sk, skb);
 
-	dst = af_ops->route_req(sk, skb, &fl, req);
+	dst = af_ops->route_req(sk, skb, &fl, req, &reason);
 	if (!dst)
 		goto drop_and_free;
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 3c163b54b0f8..026a36f1598b 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1423,14 +1423,22 @@ static void tcp_v4_init_req(struct request_sock *req,
 static struct dst_entry *tcp_v4_route_req(const struct sock *sk,
 					  struct sk_buff *skb,
 					  struct flowi *fl,
-					  struct request_sock *req)
+					  struct request_sock *req,
+					  enum skb_drop_reason *reason)
 {
+	struct dst_entry *dst;
+
 	tcp_v4_init_req(req, sk, skb);
 
-	if (security_inet_conn_request(sk, skb, req))
+	if (security_inet_conn_request(sk, skb, req)) {
+		SKB_DR_SET(*reason, LSM);
 		return NULL;
+	}
 
-	return inet_csk_route_req(sk, &fl->u.ip4, req);
+	dst = inet_csk_route_req(sk, &fl->u.ip4, req);
+	if (!dst)
+		SKB_DR_SET(*reason, IP_OUTNOROUTES);
+	return dst;
 }
 
 struct request_sock_ops tcp_request_sock_ops __read_mostly = {
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 132b27763229..b859adcde756 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -802,14 +802,22 @@ static void tcp_v6_init_req(struct request_sock *req,
 static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
 					  struct sk_buff *skb,
 					  struct flowi *fl,
-					  struct request_sock *req)
+					  struct request_sock *req,
+					  enum skb_drop_reason *reason)
 {
+	struct dst_entry *dst;
+
 	tcp_v6_init_req(req, sk, skb);
 
-	if (security_inet_conn_request(sk, skb, req))
+	if (security_inet_conn_request(sk, skb, req)) {
+		SKB_DR_SET(*reason, LSM);
 		return NULL;
+	}
 
-	return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
+	dst = inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
+	if (!dst)
+		SKB_DR_SET(*reason, IP_OUTNOROUTES);
+	return dst;
 }
 
 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 58c1f056213b..db7e6cd96d44 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -285,7 +285,8 @@ EXPORT_SYMBOL_GPL(mptcp_subflow_init_cookie_req);
 static struct dst_entry *subflow_v4_route_req(const struct sock *sk,
 					      struct sk_buff *skb,
 					      struct flowi *fl,
-					      struct request_sock *req)
+					      struct request_sock *req,
+					      enum skb_drop_reason *reason)
 {
 	struct dst_entry *dst;
 	int err;
@@ -293,7 +294,7 @@ static struct dst_entry *subflow_v4_route_req(const struct sock *sk,
 	tcp_rsk(req)->is_mptcp = 1;
 	subflow_init_req(req, sk);
 
-	dst = tcp_request_sock_ipv4_ops.route_req(sk, skb, fl, req);
+	dst = tcp_request_sock_ipv4_ops.route_req(sk, skb, fl, req, reason);
 	if (!dst)
 		return NULL;
 
@@ -311,7 +312,8 @@ static struct dst_entry *subflow_v4_route_req(const struct sock *sk,
 static struct dst_entry *subflow_v6_route_req(const struct sock *sk,
 					      struct sk_buff *skb,
 					      struct flowi *fl,
-					      struct request_sock *req)
+					      struct request_sock *req,
+					      enum skb_drop_reason *reason)
 {
 	struct dst_entry *dst;
 	int err;
@@ -319,7 +321,7 @@ static struct dst_entry *subflow_v6_route_req(const struct sock *sk,
 	tcp_rsk(req)->is_mptcp = 1;
 	subflow_init_req(req, sk);
 
-	dst = tcp_request_sock_ipv6_ops.route_req(sk, skb, fl, req);
+	dst = tcp_request_sock_ipv6_ops.route_req(sk, skb, fl, req, reason);
 	if (!dst)
 		return NULL;
 
-- 
2.36.1


      parent reply	other threads:[~2022-05-17  8:14 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-17  8:09 [PATCH net-next v2 0/9] net: tcp: add skb drop reasons to tcp state change menglong8.dong
2022-05-17  8:10 ` [PATCH net-next v2 1/9] net: skb: introduce __DEFINE_SKB_DROP_REASON() to simply the code menglong8.dong
2022-05-18  1:14   ` Jakub Kicinski
2022-05-18  2:15     ` Menglong Dong
2022-05-17  8:10 ` [PATCH net-next v2 2/9] net: skb: introduce __skb_queue_purge_reason() menglong8.dong
2022-05-17  8:10 ` [PATCH net-next v2 3/9] net: sock: introduce sk_stream_kill_queues_reason() menglong8.dong
2022-05-17  8:10 ` [PATCH net-next v2 4/9] net: inet: add skb drop reason to inet_csk_destroy_sock() menglong8.dong
2022-05-17  8:10 ` [PATCH net-next v2 5/9] net: tcp: make tcp_rcv_synsent_state_process() return drop reasons menglong8.dong
2022-05-17  8:10 ` [PATCH net-next v2 6/9] net: tcp: make tcp_rcv_state_process() return drop reason menglong8.dong
2022-05-17  8:10 ` [PATCH net-next v2 7/9] net: tcp: add skb drop reasons to tcp connect requesting menglong8.dong
2022-05-17  8:10 ` [PATCH net-next v2 8/9] net: tcp: add skb drop reasons to tcp tw code path menglong8.dong
2022-05-17  8:10 ` menglong8.dong [this message]

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