netdev - [Patch bpf v2 7/7] skmsg: increase sk->sk

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Message-Id: <20210522191411.21446-8-xiyou.wangcong@gmail.com>
Date:   Sat, 22 May 2021 12:14:11 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, Cong Wang <cong.wang@...edance.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: [Patch bpf v2 7/7] skmsg: increase sk->sk_drops when dropping packets

From: Cong Wang <cong.wang@...edance.com>

It is hard to observe packet drops without increase relevant
drop counters, here we should increase sk->sk_drops which is
a protocol-independent counter. Fortunately psock is always
assocaited with a struct sock, we can just use psock->sk.

Cc: John Fastabend <john.fastabend@...il.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Jakub Sitnicki <jakub@...udflare.com>
Cc: Lorenz Bauer <lmb@...udflare.com>
Signed-off-by: Cong Wang <cong.wang@...edance.com>
---
 net/core/skmsg.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 7b2c25038a48..de3af8152d07 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -578,6 +578,12 @@ static int sk_psock_handle_skb(struct sk_psock *psock, struct sk_buff *skb,
 	return sk_psock_skb_ingress(psock, skb);
 }
 
+static void sock_drop(struct sock *sk, struct sk_buff *skb)
+{
+	sk_drops_add(sk, skb);
+	kfree_skb(skb);
+}
+
 static void sk_psock_backlog(struct work_struct *work)
 {
 	struct sk_psock *psock = container_of(work, struct sk_psock, work);
@@ -617,7 +623,7 @@ static void sk_psock_backlog(struct work_struct *work)
 				/* Hard errors break pipe and stop xmit. */
 				sk_psock_report_error(psock, ret ? -ret : EPIPE);
 				sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED);
-				kfree_skb(skb);
+				sock_drop(psock->sk, skb);
 				goto end;
 			}
 			off += ret;
@@ -625,7 +631,7 @@ static void sk_psock_backlog(struct work_struct *work)
 		} while (len);
 
 		if (!ingress)
-			kfree_skb(skb);
+			sock_drop(psock->sk, skb);
 	}
 end:
 	mutex_unlock(&psock->work_mutex);
@@ -708,7 +714,7 @@ static void __sk_psock_zap_ingress(struct sk_psock *psock)
 
 	while ((skb = skb_dequeue(&psock->ingress_skb)) != NULL) {
 		skb_bpf_redirect_clear(skb);
-		kfree_skb(skb);
+		sock_drop(psock->sk, skb);
 	}
 	__sk_psock_purge_ingress_msg(psock);
 }
@@ -834,7 +840,7 @@ static int sk_psock_skb_redirect(struct sk_psock *from, struct sk_buff *skb)
 	 * return code, but then didn't set a redirect interface.
 	 */
 	if (unlikely(!sk_other)) {
-		kfree_skb(skb);
+		sock_drop(from->sk, skb);
 		return -EIO;
 	}
 	psock_other = sk_psock(sk_other);
@@ -843,13 +849,13 @@ static int sk_psock_skb_redirect(struct sk_psock *from, struct sk_buff *skb)
 	 * a socket that is in this state so we drop the skb.
 	 */
 	if (!psock_other || sock_flag(sk_other, SOCK_DEAD)) {
-		kfree_skb(skb);
+		sock_drop(from->sk, skb);
 		return -EIO;
 	}
 	spin_lock_bh(&psock_other->ingress_lock);
 	if (!sk_psock_test_state(psock_other, SK_PSOCK_TX_ENABLED)) {
 		spin_unlock_bh(&psock_other->ingress_lock);
-		kfree_skb(skb);
+		sock_drop(from->sk, skb);
 		return -EIO;
 	}
 
@@ -938,7 +944,7 @@ static int sk_psock_verdict_apply(struct sk_psock *psock, struct sk_buff *skb,
 	case __SK_DROP:
 	default:
 out_free:
-		kfree_skb(skb);
+		sock_drop(psock->sk, skb);
 	}
 
 	return err;
@@ -973,7 +979,7 @@ static void sk_psock_strp_read(struct strparser *strp, struct sk_buff *skb)
 	sk = strp->sk;
 	psock = sk_psock(sk);
 	if (unlikely(!psock)) {
-		kfree_skb(skb);
+		sock_drop(sk, skb);
 		goto out;
 	}
 	prog = READ_ONCE(psock->progs.stream_verdict);
@@ -1094,7 +1100,7 @@ static int sk_psock_verdict_recv(read_descriptor_t *desc, struct sk_buff *skb,
 	psock = sk_psock(sk);
 	if (unlikely(!psock)) {
 		len = 0;
-		kfree_skb(skb);
+		sock_drop(sk, skb);
 		goto out;
 	}
 	prog = READ_ONCE(psock->progs.stream_verdict);
-- 
2.25.1