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This can be used to attach a socket to an skb, taking a reference on sk->sk_refcnt. This helper might be a NOP if sk->sk_refcnt is zero. Use it from tcp_make_synack(). Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com> Reviewed-by: Brian Vazquez <brianvv@google.com> Link: https://patch.msgid.link/20241010174817.1543642-4-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>