From patchwork Wed Nov 18 13:59:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Schiller X-Patchwork-Id: 11915185 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00B0BC64E75 for ; Wed, 18 Nov 2020 14:00:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ABD5420B80 for ; Wed, 18 Nov 2020 14:00:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726868AbgKROAR (ORCPT ); Wed, 18 Nov 2020 09:00:17 -0500 Received: from mxout70.expurgate.net ([194.37.255.70]:59597 "EHLO mxout70.expurgate.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726855AbgKROAR (ORCPT ); Wed, 18 Nov 2020 09:00:17 -0500 Received: from [127.0.0.1] (helo=localhost) by relay.expurgate.net with smtp (Exim 4.90) (envelope-from ) id 1kfO0K-0003Pj-MG; Wed, 18 Nov 2020 15:00:12 +0100 Received: from [195.243.126.94] (helo=securemail.tdt.de) by relay.expurgate.net with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90) (envelope-from ) id 1kfO0J-0007Ee-I5; Wed, 18 Nov 2020 15:00:11 +0100 Received: from securemail.tdt.de (localhost [127.0.0.1]) by securemail.tdt.de (Postfix) with ESMTP id 1BB43240041; Wed, 18 Nov 2020 15:00:11 +0100 (CET) Received: from mail.dev.tdt.de (unknown [10.2.4.42]) by securemail.tdt.de (Postfix) with ESMTP id 9293F240040; Wed, 18 Nov 2020 15:00:10 +0100 (CET) Received: from mschiller01.dev.tdt.de (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id 435D020370; Wed, 18 Nov 2020 15:00:09 +0100 (CET) From: Martin Schiller To: andrew.hendry@gmail.com, davem@davemloft.net, kuba@kernel.org, xie.he.0141@gmail.com Cc: linux-x25@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Schiller Subject: [PATCH net-next v3 5/6] net/x25: fix restart request/confirm handling Date: Wed, 18 Nov 2020 14:59:18 +0100 Message-ID: <20201118135919.1447-6-ms@dev.tdt.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201118135919.1447-1-ms@dev.tdt.de> References: <20201118135919.1447-1-ms@dev.tdt.de> MIME-Version: 1.0 X-purgate-type: clean X-purgate-ID: 151534::1605708012-000037DC-5679FC1D/0/0 X-purgate: clean Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org We have to take the actual link state into account to handle restart requests/confirms well. Also, the T20 timer needs to be stopped, if the link is terminated. Signed-off-by: Martin Schiller --- net/x25/x25_link.c | 45 +++++++++++++++++++++++++++++++++++++-------- 1 file changed, 37 insertions(+), 8 deletions(-) diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c index 92828a8a4ada..40ffc10f7a96 100644 --- a/net/x25/x25_link.c +++ b/net/x25/x25_link.c @@ -74,16 +74,43 @@ void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb, switch (frametype) { case X25_RESTART_REQUEST: - confirm = !x25_t20timer_pending(nb); - x25_stop_t20timer(nb); - nb->state = X25_LINK_STATE_3; - if (confirm) + switch (nb->state) { + case X25_LINK_STATE_2: + confirm = !x25_t20timer_pending(nb); + x25_stop_t20timer(nb); + nb->state = X25_LINK_STATE_3; + if (confirm) + x25_transmit_restart_confirmation(nb); + break; + case X25_LINK_STATE_3: + /* clear existing virtual calls */ + x25_kill_by_neigh(nb); + x25_transmit_restart_confirmation(nb); + break; + } break; case X25_RESTART_CONFIRMATION: - x25_stop_t20timer(nb); - nb->state = X25_LINK_STATE_3; + switch (nb->state) { + case X25_LINK_STATE_2: + if (x25_t20timer_pending(nb)) { + x25_stop_t20timer(nb); + nb->state = X25_LINK_STATE_3; + } else { + x25_transmit_restart_request(nb); + x25_start_t20timer(nb); + } + break; + case X25_LINK_STATE_3: + /* clear existing virtual calls */ + x25_kill_by_neigh(nb); + + x25_transmit_restart_request(nb); + nb->state = X25_LINK_STATE_2; + x25_start_t20timer(nb); + break; + } break; case X25_DIAGNOSTIC: @@ -214,8 +241,6 @@ void x25_link_established(struct x25_neigh *nb) { switch (nb->state) { case X25_LINK_STATE_0: - nb->state = X25_LINK_STATE_2; - break; case X25_LINK_STATE_1: x25_transmit_restart_request(nb); nb->state = X25_LINK_STATE_2; @@ -232,6 +257,10 @@ void x25_link_established(struct x25_neigh *nb) void x25_link_terminated(struct x25_neigh *nb) { nb->state = X25_LINK_STATE_0; + + if (x25_t20timer_pending(nb)) + x25_stop_t20timer(nb); + /* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */ x25_kill_by_neigh(nb); }