netdev - Re: [bpf PATCH v2 2/6] bpf: tls fix transition through disconnect with close

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Date:   Tue, 9 Jul 2019 19:45:25 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org,
        edumazet@...gle.com, bpf@...r.kernel.org
Subject: Re: [bpf PATCH v2 2/6] bpf: tls fix transition through disconnect
 with close

On Mon, 08 Jul 2019 19:14:05 +0000, John Fastabend wrote:
> @@ -287,6 +313,27 @@ static void tls_sk_proto_cleanup(struct sock *sk,
>  #endif
>  }
>  
> +static void tls_sk_proto_unhash(struct sock *sk)
> +{
> +	struct inet_connection_sock *icsk = inet_csk(sk);
> +	long timeo = sock_sndtimeo(sk, 0);
> +	struct tls_context *ctx;
> +
> +	if (unlikely(!icsk->icsk_ulp_data)) {

Is this for when sockmap is stacked on top of TLS and TLS got removed
without letting sockmap know?

> +		if (sk->sk_prot->unhash)
> +			sk->sk_prot->unhash(sk);
> +	}
> +
> +	ctx = tls_get_ctx(sk);
> +	if (ctx->tx_conf == TLS_SW || ctx->rx_conf == TLS_SW)
> +		tls_sk_proto_cleanup(sk, ctx, timeo);
> +	icsk->icsk_ulp_data = NULL;

I think close only starts checking if ctx is NULL in patch 6.
Looks like some chunks of ctx checking/clearing got spread to
patch 1 and some to patch 6.

> +	tls_ctx_free_wq(ctx);
> +
> +	if (ctx->unhash)
> +		ctx->unhash(sk);
> +}
> +
>  static void tls_sk_proto_close(struct sock *sk, long timeout)
>  {
>  	struct tls_context *ctx = tls_get_ctx(sk);