netdev - [Patch bpf v3 7/8] skmsg: pass source psock to sk_psock_skb

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Date:   Wed, 26 May 2021 18:11:54 -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 v3 7/8] skmsg: pass source psock to sk_psock_skb_redirect()

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

sk_psock_skb_redirect() only takes skb as a parameter, we
will need to know where this skb is from, so just pass
the source psock to this function as a new parameter.
This patch prepares for the next one.

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 | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index e3d210811db4..3aa9065811ad 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -824,7 +824,7 @@ int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
 }
 EXPORT_SYMBOL_GPL(sk_psock_msg_verdict);
 
-static int sk_psock_skb_redirect(struct sk_buff *skb)
+static int sk_psock_skb_redirect(struct sk_psock *from, struct sk_buff *skb)
 {
 	struct sk_psock *psock_other;
 	struct sock *sk_other;
@@ -861,11 +861,12 @@ static int sk_psock_skb_redirect(struct sk_buff *skb)
 	return 0;
 }
 
-static void sk_psock_tls_verdict_apply(struct sk_buff *skb, struct sock *sk, int verdict)
+static void sk_psock_tls_verdict_apply(struct sk_buff *skb,
+				       struct sk_psock *from, int verdict)
 {
 	switch (verdict) {
 	case __SK_REDIRECT:
-		sk_psock_skb_redirect(skb);
+		sk_psock_skb_redirect(from, skb);
 		break;
 	case __SK_PASS:
 	case __SK_DROP:
@@ -889,7 +890,7 @@ int sk_psock_tls_strp_read(struct sk_psock *psock, struct sk_buff *skb)
 		ret = sk_psock_map_verd(ret, skb_bpf_redirect_fetch(skb));
 		skb->sk = NULL;
 	}
-	sk_psock_tls_verdict_apply(skb, psock->sk, ret);
+	sk_psock_tls_verdict_apply(skb, psock, ret);
 	rcu_read_unlock();
 	return ret;
 }
@@ -936,7 +937,7 @@ static int sk_psock_verdict_apply(struct sk_psock *psock, struct sk_buff *skb,
 		}
 		break;
 	case __SK_REDIRECT:
-		err = sk_psock_skb_redirect(skb);
+		err = sk_psock_skb_redirect(psock, skb);
 		break;
 	case __SK_DROP:
 	default:
-- 
2.25.1