From patchwork Mon Dec 9 07:21:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Schiller X-Patchwork-Id: 1205973 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=dev.tdt.de Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47WZPw4KYpz9sPc for ; Mon, 9 Dec 2019 18:21:56 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727113AbfLIHVn (ORCPT ); Mon, 9 Dec 2019 02:21:43 -0500 Received: from host-88-217-225-28.customer.m-online.net ([88.217.225.28]:17274 "EHLO mail.dev.tdt.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726623AbfLIHVn (ORCPT ); Mon, 9 Dec 2019 02:21:43 -0500 Received: from mschiller01.dev.tdt.de (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id 8EB3D20942; Mon, 9 Dec 2019 07:21:38 +0000 (UTC) From: Martin Schiller To: andrew.hendry@gmail.com, davem@davemloft.net Cc: edumazet@google.com, linux-x25@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Schiller Subject: [PATCH v2] net/x25: add new state X25_STATE_5 Date: Mon, 9 Dec 2019 08:21:34 +0100 Message-Id: <20191209072134.19746-1-ms@dev.tdt.de> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on mail.dev.tdt.de Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is needed, because if the flag X25_ACCPT_APPRV_FLAG is not set on a socket (manual call confirmation) and the channel is cleared by remote before the manual call confirmation was sent, this situation needs to be handled. Signed-off-by: Martin Schiller --- include/net/x25.h | 3 ++- net/x25/af_x25.c | 8 ++++++++ net/x25/x25_in.c | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 42 insertions(+), 1 deletion(-) diff --git a/include/net/x25.h b/include/net/x25.h index ed1acc3044ac..d7d6c2b4ffa7 100644 --- a/include/net/x25.h +++ b/include/net/x25.h @@ -62,7 +62,8 @@ enum { X25_STATE_1, /* Awaiting Call Accepted */ X25_STATE_2, /* Awaiting Clear Confirmation */ X25_STATE_3, /* Data Transfer */ - X25_STATE_4 /* Awaiting Reset Confirmation */ + X25_STATE_4, /* Awaiting Reset Confirmation */ + X25_STATE_5 /* Call Accepted / Call Connected pending */ }; enum { diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index c34f7d077604..2efe44a34644 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -659,6 +659,12 @@ static int x25_release(struct socket *sock) sock_set_flag(sk, SOCK_DEAD); sock_set_flag(sk, SOCK_DESTROY); break; + + case X25_STATE_5: + x25_write_internal(sk, X25_CLEAR_REQUEST); + x25_disconnect(sk, 0, 0, 0); + __x25_destroy_socket(sk); + goto out; } sock_orphan(sk); @@ -1054,6 +1060,8 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { x25_write_internal(make, X25_CALL_ACCEPTED); makex25->state = X25_STATE_3; + } else { + makex25->state = X25_STATE_5; } /* diff --git a/net/x25/x25_in.c b/net/x25/x25_in.c index f97c43344e95..4d3bb46aaae0 100644 --- a/net/x25/x25_in.c +++ b/net/x25/x25_in.c @@ -382,6 +382,35 @@ static int x25_state4_machine(struct sock *sk, struct sk_buff *skb, int frametyp return 0; } +/* + * State machine for state 5, Call Accepted / Call Connected pending (X25_ACCPT_APPRV_FLAG). + * The handling of the timer(s) is in file x25_timer.c + * Handling of state 0 and connection release is in af_x25.c. + */ +static int x25_state5_machine(struct sock *sk, struct sk_buff *skb, int frametype) +{ + struct x25_sock *x25 = x25_sk(sk); + + switch (frametype) { + case X25_CLEAR_REQUEST: + if (!pskb_may_pull(skb, X25_STD_MIN_LEN + 2)) { + x25_write_internal(sk, X25_CLEAR_REQUEST); + x25->state = X25_STATE_2; + x25_start_t23timer(sk); + return 0; + } + + x25_write_internal(sk, X25_CLEAR_CONFIRMATION); + x25_disconnect(sk, 0, skb->data[3], skb->data[4]); + break; + + default: + break; + } + + return 0; +} + /* Higher level upcall for a LAPB frame */ int x25_process_rx_frame(struct sock *sk, struct sk_buff *skb) { @@ -406,6 +435,9 @@ int x25_process_rx_frame(struct sock *sk, struct sk_buff *skb) case X25_STATE_4: queued = x25_state4_machine(sk, skb, frametype); break; + case X25_STATE_5: + queued = x25_state5_machine(sk, skb, frametype); + break; } x25_kick(sk);