netdev - [PATCH v2 net-next 4/5] ipv6: tcp: give socket pointer to control skbs

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Message-ID: <20241006203224.1404384-5-edumazet@google.com>
Date: Sun,  6 Oct 2024 20:32:23 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Martin KaFai Lau <martin.lau@...ux.dev>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 4/5] ipv6: tcp: give socket pointer to control skbs

tcp_v6_send_response() send orphaned 'control packets'.

These are RST packets and also ACK packets sent from TIME_WAIT.

Some eBPF programs would prefer to have a meaningful skb->sk
pointer as much as possible.

This means that TCP can now attach TIME_WAIT sockets to outgoing
skbs.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv6/tcp_ipv6.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 7634c0be6acbdb67bb378cc81bdbf184552d2afc..597920061a3a061a878bf0f7a1b03ac4898918a9 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -967,6 +967,9 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
 	}
 
 	if (sk) {
+		/* unconstify the socket only to attach it to buff with care. */
+		skb_set_owner_edemux(buff, (struct sock *)sk);
+
 		if (sk->sk_state == TCP_TIME_WAIT)
 			mark = inet_twsk(sk)->tw_mark;
 		else
-- 
2.47.0.rc0.187.ge670bccf7e-goog