From patchwork Mon Nov 16 13:55:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Schiller X-Patchwork-Id: 11908583 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 B4822C5519F for ; Mon, 16 Nov 2020 13:56:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8EBCC238E6 for ; Mon, 16 Nov 2020 13:56:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730029AbgKPN4k (ORCPT ); Mon, 16 Nov 2020 08:56:40 -0500 Received: from mxout70.expurgate.net ([91.198.224.70]:26269 "EHLO mxout70.expurgate.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729475AbgKPN4j (ORCPT ); Mon, 16 Nov 2020 08:56:39 -0500 Received: from [127.0.0.1] (helo=localhost) by relay.expurgate.net with smtp (Exim 4.92) (envelope-from ) id 1keezj-0006O1-5o; Mon, 16 Nov 2020 14:56:35 +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 4.92) (envelope-from ) id 1keezi-0003me-A6; Mon, 16 Nov 2020 14:56:34 +0100 Received: from securemail.tdt.de (localhost [127.0.0.1]) by securemail.tdt.de (Postfix) with ESMTP id 10B0B240049; Mon, 16 Nov 2020 14:56:34 +0100 (CET) Received: from mail.dev.tdt.de (unknown [10.2.4.42]) by securemail.tdt.de (Postfix) with ESMTP id 87CE4240047; Mon, 16 Nov 2020 14:56:33 +0100 (CET) Received: from mschiller01.dev.tdt.de (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id 73878200AE; Mon, 16 Nov 2020 14:56:32 +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 v2 1/6] net/x25: handle additional netdev events Date: Mon, 16 Nov 2020 14:55:18 +0100 Message-ID: <20201116135522.21791-2-ms@dev.tdt.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201116135522.21791-1-ms@dev.tdt.de> References: <20201116135522.21791-1-ms@dev.tdt.de> MIME-Version: 1.0 X-purgate: clean X-purgate-ID: 151534::1605534994-0001FA9D-D7499192/0/0 X-purgate-type: clean Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Add / remove x25_link_device by NETDEV_REGISTER/UNREGISTER and also by NETDEV_POST_TYPE_CHANGE/NETDEV_PRE_TYPE_CHANGE. This change is needed so that the x25_neigh struct for an interface is already created when it shows up and is kept independently if the interface goes UP or DOWN. This is used in the next commit, where x25 params of an neighbour will get configurable through ioctls. Signed-off-by: Martin Schiller --- Change from v1: fix 'subject_prefix' and 'checkpatch' warnings --- include/net/x25.h | 2 ++ net/x25/af_x25.c | 26 ++++++++++++++++++++++++++ net/x25/x25_link.c | 45 +++++++++++++++++++++++++++++++++++++++------ 3 files changed, 67 insertions(+), 6 deletions(-) diff --git a/include/net/x25.h b/include/net/x25.h index d7d6c2b4ffa7..4c1502e8b2b2 100644 --- a/include/net/x25.h +++ b/include/net/x25.h @@ -231,6 +231,8 @@ int x25_backlog_rcv(struct sock *, struct sk_buff *); /* x25_link.c */ void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short); +void x25_link_device_add(struct net_device *dev); +void x25_link_device_remove(struct net_device *dev); void x25_link_device_up(struct net_device *); void x25_link_device_down(struct net_device *); void x25_link_established(struct x25_neigh *); diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 046d3fee66a9..d2a52c254cca 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -233,10 +233,24 @@ static int x25_device_event(struct notifier_block *this, unsigned long event, #endif ) { switch (event) { + case NETDEV_REGISTER: + pr_debug("X.25: got event NETDEV_REGISTER for device: %s\n", + dev->name); + x25_link_device_add(dev); + break; + case NETDEV_POST_TYPE_CHANGE: + pr_debug("X.25: got event NETDEV_POST_TYPE_CHANGE for device: %s\n", + dev->name); + x25_link_device_add(dev); + break; case NETDEV_UP: + pr_debug("X.25: got event NETDEV_UP for device: %s\n", + dev->name); x25_link_device_up(dev); break; case NETDEV_GOING_DOWN: + pr_debug("X.25: got event NETDEV_GOING_DOWN for device: %s\n", + dev->name); nb = x25_get_neigh(dev); if (nb) { x25_terminate_link(nb); @@ -244,10 +258,22 @@ static int x25_device_event(struct notifier_block *this, unsigned long event, } break; case NETDEV_DOWN: + pr_debug("X.25: got event NETDEV_DOWN for device: %s\n", + dev->name); x25_kill_by_device(dev); x25_route_device_down(dev); x25_link_device_down(dev); break; + case NETDEV_PRE_TYPE_CHANGE: + pr_debug("X.25: got event NETDEV_PRE_TYPE_CHANGE for device: %s\n", + dev->name); + x25_link_device_remove(dev); + break; + case NETDEV_UNREGISTER: + pr_debug("X.25: got event NETDEV_UNREGISTER for device: %s\n", + dev->name); + x25_link_device_remove(dev); + break; } } diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c index fdae054b7dc1..92828a8a4ada 100644 --- a/net/x25/x25_link.c +++ b/net/x25/x25_link.c @@ -239,9 +239,17 @@ void x25_link_terminated(struct x25_neigh *nb) /* * Add a new device. */ -void x25_link_device_up(struct net_device *dev) +void x25_link_device_add(struct net_device *dev) { - struct x25_neigh *nb = kmalloc(sizeof(*nb), GFP_ATOMIC); + struct x25_neigh *nb = x25_get_neigh(dev); + + /* Check, if we already have a neighbour for this device */ + if (nb) { + x25_neigh_put(nb); + return; + } + + nb = kmalloc(sizeof(*nb), GFP_ATOMIC); if (!nb) return; @@ -268,6 +276,20 @@ void x25_link_device_up(struct net_device *dev) write_unlock_bh(&x25_neigh_list_lock); } +/* A device is coming up */ +void x25_link_device_up(struct net_device *dev) +{ + struct x25_neigh *nb = x25_get_neigh(dev); + + if (!nb) + return; + + nb->state = X25_LINK_STATE_1; + x25_establish_link(nb); + + x25_neigh_put(nb); +} + /** * __x25_remove_neigh - remove neighbour from x25_neigh_list * @nb: - neigh to remove @@ -277,9 +299,6 @@ void x25_link_device_up(struct net_device *dev) */ static void __x25_remove_neigh(struct x25_neigh *nb) { - skb_queue_purge(&nb->queue); - x25_stop_t20timer(nb); - if (nb->node.next) { list_del(&nb->node); x25_neigh_put(nb); @@ -289,7 +308,7 @@ static void __x25_remove_neigh(struct x25_neigh *nb) /* * A device has been removed, remove its links. */ -void x25_link_device_down(struct net_device *dev) +void x25_link_device_remove(struct net_device *dev) { struct x25_neigh *nb; struct list_head *entry, *tmp; @@ -308,6 +327,20 @@ void x25_link_device_down(struct net_device *dev) write_unlock_bh(&x25_neigh_list_lock); } +/* A device is going down */ +void x25_link_device_down(struct net_device *dev) +{ + struct x25_neigh *nb = x25_get_neigh(dev); + + if (!nb) + return; + + skb_queue_purge(&nb->queue); + x25_stop_t20timer(nb); + + x25_neigh_put(nb); +} + /* * Given a device, return the neighbour address. */ From patchwork Mon Nov 16 13:55:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Schiller X-Patchwork-Id: 11908589 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 59151C4742C for ; Mon, 16 Nov 2020 13:59:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13480222E8 for ; Mon, 16 Nov 2020 13:59:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729734AbgKPN7O (ORCPT ); Mon, 16 Nov 2020 08:59:14 -0500 Received: from mxout70.expurgate.net ([194.37.255.70]:53871 "EHLO mxout70.expurgate.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729674AbgKPN7N (ORCPT ); Mon, 16 Nov 2020 08:59:13 -0500 Received: from [127.0.0.1] (helo=localhost) by relay.expurgate.net with smtp (Exim 4.90) (envelope-from ) id 1kef2A-0001Eu-PR; Mon, 16 Nov 2020 14:59:06 +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 1kef29-0004bc-Jd; Mon, 16 Nov 2020 14:59:05 +0100 Received: from securemail.tdt.de (localhost [127.0.0.1]) by securemail.tdt.de (Postfix) with ESMTP id 1EBE9240049; Mon, 16 Nov 2020 14:59:05 +0100 (CET) Received: from mail.dev.tdt.de (unknown [10.2.4.42]) by securemail.tdt.de (Postfix) with ESMTP id 92F64240047; Mon, 16 Nov 2020 14:59:04 +0100 (CET) Received: from mschiller01.dev.tdt.de (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id AE8B8200AE; Mon, 16 Nov 2020 14:59:03 +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 v2 2/6] net/x25: make neighbour params configurable Date: Mon, 16 Nov 2020 14:55:20 +0100 Message-ID: <20201116135522.21791-3-ms@dev.tdt.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201116135522.21791-1-ms@dev.tdt.de> References: <20201116135522.21791-1-ms@dev.tdt.de> MIME-Version: 1.0 X-purgate-ID: 151534::1605535146-0000CF01-311A93D8/0/0 X-purgate: clean X-purgate-type: clean Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Extended struct x25_neigh and x25_subscrip_struct to configure following params through SIOCX25SSUBSCRIP: o mode (DTE/DCE) o number of channels o facilities (packet size, window size) o timer T20 Based on this configuration options the following changes/extensions where made: o DTE/DCE handling to select the next lc (DCE=from bottom / DTE=from top) o DTE/DCE handling to set correct clear/reset/restart cause o take default facilities from neighbour settings Signed-off-by: Martin Schiller --- Change from v1: o fix 'subject_prefix' and 'checkpatch' warnings o fix incompatible assignment of 'struct compat_x25_facilities' --- include/net/x25.h | 8 ++- include/uapi/linux/x25.h | 56 ++++++++------- net/x25/af_x25.c | 145 ++++++++++++++++++++++++++++++++------- net/x25/x25_facilities.c | 6 +- net/x25/x25_link.c | 97 ++++++++++++++++++++++---- net/x25/x25_subr.c | 22 +++++- 6 files changed, 268 insertions(+), 66 deletions(-) diff --git a/include/net/x25.h b/include/net/x25.h index 4c1502e8b2b2..ec00f595fcc6 100644 --- a/include/net/x25.h +++ b/include/net/x25.h @@ -140,6 +140,9 @@ struct x25_neigh { struct net_device *dev; unsigned int state; unsigned int extended; + unsigned int dce; + unsigned int lc; + struct x25_facilities facilities; struct sk_buff_head queue; unsigned long t20; struct timer_list t20timer; @@ -164,6 +167,8 @@ struct x25_sock { struct timer_list timer; struct x25_causediag causediag; struct x25_facilities facilities; + /* set, if facilities changed by SIOCX25SFACILITIES */ + unsigned int socket_defined_facilities; struct x25_dte_facilities dte_facilities; struct x25_calluserdata calluserdata; unsigned long vc_facil_mask; /* inc_call facilities mask */ @@ -215,7 +220,8 @@ int x25_create_facilities(unsigned char *, struct x25_facilities *, struct x25_dte_facilities *, unsigned long); int x25_negotiate_facilities(struct sk_buff *, struct sock *, struct x25_facilities *, - struct x25_dte_facilities *); + struct x25_dte_facilities *, + struct x25_neigh *); void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *); /* x25_forward.c */ diff --git a/include/uapi/linux/x25.h b/include/uapi/linux/x25.h index 034b7dc5593a..094dc2cff37b 100644 --- a/include/uapi/linux/x25.h +++ b/include/uapi/linux/x25.h @@ -63,31 +63,6 @@ struct sockaddr_x25 { struct x25_address sx25_addr; /* X.121 Address */ }; -/* - * DTE/DCE subscription options. - * - * As this is missing lots of options, user should expect major - * changes of this structure in 2.5.x which might break compatibilty. - * The somewhat ugly dimension 200-sizeof() is needed to maintain - * backward compatibility. - */ -struct x25_subscrip_struct { - char device[200-sizeof(unsigned long)]; - unsigned long global_facil_mask; /* 0 to disable negotiation */ - unsigned int extended; -}; - -/* values for above global_facil_mask */ - -#define X25_MASK_REVERSE 0x01 -#define X25_MASK_THROUGHPUT 0x02 -#define X25_MASK_PACKET_SIZE 0x04 -#define X25_MASK_WINDOW_SIZE 0x08 - -#define X25_MASK_CALLING_AE 0x10 -#define X25_MASK_CALLED_AE 0x20 - - /* * Routing table control structure. */ @@ -127,6 +102,37 @@ struct x25_dte_facilities { __u8 called_ae[20]; }; +/* + * DTE/DCE subscription options. + * + * As this is missing lots of options, user should expect major + * changes of this structure in 2.5.x which might break compatibility. + * The somewhat ugly dimension 200-sizeof() is needed to maintain + * backward compatibility. + */ +struct x25_subscrip_struct { + char device[200 - ((2 * sizeof(unsigned long)) + + sizeof(struct x25_facilities) + + (2 * sizeof(unsigned int)))]; + unsigned int dce; + unsigned int lc; + struct x25_facilities facilities; + unsigned long t20; + unsigned long global_facil_mask; /* 0 to disable negotiation */ + unsigned int extended; +}; + +/* values for above global_facil_mask */ + +#define X25_MASK_REVERSE 0x01 +#define X25_MASK_THROUGHPUT 0x02 +#define X25_MASK_PACKET_SIZE 0x04 +#define X25_MASK_WINDOW_SIZE 0x08 + +#define X25_MASK_CALLING_AE 0x10 +#define X25_MASK_CALLED_AE 0x20 + + /* * Call User Data structure. */ diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index d2a52c254cca..4c2a395fdbdb 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -72,8 +72,21 @@ static const struct proto_ops x25_proto_ops; static const struct x25_address null_x25_address = {" "}; #ifdef CONFIG_COMPAT +struct compat_x25_facilities { + compat_uint_t winsize_in, winsize_out; + compat_uint_t pacsize_in, pacsize_out; + compat_uint_t throughput; + compat_uint_t reverse; +}; + struct compat_x25_subscrip_struct { - char device[200-sizeof(compat_ulong_t)]; + char device[200 - ((2 * sizeof(compat_ulong_t)) + + sizeof(struct compat_x25_facilities) + + (2 * sizeof(compat_uint_t)))]; + compat_uint_t dce; + compat_uint_t lc; + struct compat_x25_facilities facilities; + compat_ulong_t t20; compat_ulong_t global_facil_mask; compat_uint_t extended; }; @@ -373,13 +386,26 @@ static unsigned int x25_new_lci(struct x25_neigh *nb) unsigned int lci = 1; struct sock *sk; - while ((sk = x25_find_socket(lci, nb)) != NULL) { - sock_put(sk); - if (++lci == 4096) { - lci = 0; - break; + if (nb->dce) { + while ((sk = x25_find_socket(lci, nb)) != NULL) { + sock_put(sk); + if (++lci > nb->lc) { + lci = 0; + break; + } + cond_resched(); + } + } else { + lci = nb->lc; + + while ((sk = x25_find_socket(lci, nb)) != NULL) { + sock_put(sk); + if (--lci == 0) { + lci = 0; + break; + } + cond_resched(); } - cond_resched(); } return lci; @@ -813,6 +839,10 @@ static int x25_connect(struct socket *sock, struct sockaddr *uaddr, if (!x25->neighbour) goto out_put_route; + if (!x25->socket_defined_facilities) + memcpy(&x25->facilities, &x25->neighbour->facilities, + sizeof(struct x25_facilities)); + x25_limit_facilities(&x25->facilities, x25->neighbour); x25->lci = x25_new_lci(x25->neighbour); @@ -1046,7 +1076,7 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, /* * Try to reach a compromise on the requested facilities. */ - len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); + len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities, nb); if (len == -1) goto out_sock_put; @@ -1460,10 +1490,15 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) rc = x25_subscr_ioctl(cmd, argp); break; case SIOCX25GFACILITIES: { + rc = -EINVAL; lock_sock(sk); + if (sk->sk_state != TCP_ESTABLISHED && + !x25->socket_defined_facilities) + goto out_gfac_release; rc = copy_to_user(argp, &x25->facilities, sizeof(x25->facilities)) ? -EFAULT : 0; +out_gfac_release: release_sock(sk); break; } @@ -1477,16 +1512,16 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) lock_sock(sk); if (sk->sk_state != TCP_LISTEN && sk->sk_state != TCP_CLOSE) - goto out_fac_release; + goto out_sfac_release; if (facilities.pacsize_in < X25_PS16 || facilities.pacsize_in > X25_PS4096) - goto out_fac_release; + goto out_sfac_release; if (facilities.pacsize_out < X25_PS16 || facilities.pacsize_out > X25_PS4096) - goto out_fac_release; + goto out_sfac_release; if (facilities.winsize_in < 1 || facilities.winsize_in > 127) - goto out_fac_release; + goto out_sfac_release; if (facilities.throughput) { int out = facilities.throughput & 0xf0; int in = facilities.throughput & 0x0f; @@ -1494,19 +1529,20 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) facilities.throughput |= X25_DEFAULT_THROUGHPUT << 4; else if (out < 0x30 || out > 0xD0) - goto out_fac_release; + goto out_sfac_release; if (!in) facilities.throughput |= X25_DEFAULT_THROUGHPUT; else if (in < 0x03 || in > 0x0D) - goto out_fac_release; + goto out_sfac_release; } if (facilities.reverse && (facilities.reverse & 0x81) != 0x81) - goto out_fac_release; + goto out_sfac_release; x25->facilities = facilities; + x25->socket_defined_facilities = 1; rc = 0; -out_fac_release: +out_sfac_release: release_sock(sk); break; } @@ -1658,6 +1694,9 @@ static int compat_x25_subscr_ioctl(unsigned int cmd, struct net_device *dev; int rc = -EINVAL; + if (cmd != SIOCX25GSUBSCRIP && cmd != SIOCX25SSUBSCRIP) + goto out; + rc = -EFAULT; if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) goto out; @@ -1671,28 +1710,86 @@ static int compat_x25_subscr_ioctl(unsigned int cmd, if (nb == NULL) goto out_dev_put; - dev_put(dev); - if (cmd == SIOCX25GSUBSCRIP) { read_lock_bh(&x25_neigh_list_lock); x25_subscr.extended = nb->extended; + x25_subscr.dce = nb->dce; + x25_subscr.lc = nb->lc; + x25_subscr.facilities.winsize_in = nb->facilities.winsize_in; + x25_subscr.facilities.winsize_out = nb->facilities.winsize_out; + x25_subscr.facilities.pacsize_in = nb->facilities.pacsize_in; + x25_subscr.facilities.pacsize_out = nb->facilities.pacsize_out; + x25_subscr.facilities.throughput = nb->facilities.throughput; + x25_subscr.facilities.reverse = nb->facilities.reverse; + x25_subscr.t20 = nb->t20; x25_subscr.global_facil_mask = nb->global_facil_mask; read_unlock_bh(&x25_neigh_list_lock); rc = copy_to_user(x25_subscr32, &x25_subscr, sizeof(*x25_subscr32)) ? -EFAULT : 0; } else { rc = -EINVAL; - if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { - rc = 0; - write_lock_bh(&x25_neigh_list_lock); - nb->extended = x25_subscr.extended; - nb->global_facil_mask = x25_subscr.global_facil_mask; - write_unlock_bh(&x25_neigh_list_lock); + + if (dev->flags & IFF_UP) + return -EBUSY; + + if (x25_subscr.extended != 0 && x25_subscr.extended != 1) + goto out_dev_and_neigh_put; + if (x25_subscr.dce != 0 && x25_subscr.dce != 1) + goto out_dev_and_neigh_put; + if (x25_subscr.lc < 1 || x25_subscr.lc > 4095) + goto out_dev_and_neigh_put; + if (x25_subscr.facilities.pacsize_in < X25_PS16 || + x25_subscr.facilities.pacsize_in > X25_PS4096) + goto out_dev_and_neigh_put; + if (x25_subscr.facilities.pacsize_out < X25_PS16 || + x25_subscr.facilities.pacsize_out > X25_PS4096) + goto out_dev_and_neigh_put; + if (x25_subscr.facilities.winsize_in < 1 || + x25_subscr.facilities.winsize_in > 127) + goto out_dev_and_neigh_put; + if (x25_subscr.facilities.throughput) { + int out = x25_subscr.facilities.throughput & 0xf0; + int in = x25_subscr.facilities.throughput & 0x0f; + + if (!out) + x25_subscr.facilities.throughput |= + X25_DEFAULT_THROUGHPUT << 4; + else if (out < 0x30 || out > 0xD0) + goto out_dev_and_neigh_put; + if (!in) + x25_subscr.facilities.throughput |= + X25_DEFAULT_THROUGHPUT; + else if (in < 0x03 || in > 0x0D) + goto out_dev_and_neigh_put; } + if (x25_subscr.facilities.reverse && + (x25_subscr.facilities.reverse & 0x81) != 0x81) + goto out_dev_and_neigh_put; + if (x25_subscr.t20 < 1 * HZ || x25_subscr.t20 > 300 * HZ) + goto out_dev_and_neigh_put; + + rc = 0; + write_lock_bh(&x25_neigh_list_lock); + nb->extended = x25_subscr.extended; + nb->dce = x25_subscr.dce; + nb->lc = x25_subscr.lc; + nb->facilities.winsize_in = x25_subscr.facilities.winsize_in; + nb->facilities.winsize_out = x25_subscr.facilities.winsize_out; + nb->facilities.pacsize_in = x25_subscr.facilities.pacsize_in; + nb->facilities.pacsize_out = x25_subscr.facilities.pacsize_out; + nb->facilities.throughput = x25_subscr.facilities.throughput; + nb->facilities.reverse = x25_subscr.facilities.reverse; + nb->t20 = x25_subscr.t20; + nb->global_facil_mask = x25_subscr.global_facil_mask; + write_unlock_bh(&x25_neigh_list_lock); } + dev_put(dev); + x25_neigh_put(nb); out: return rc; +out_dev_and_neigh_put: + x25_neigh_put(nb); out_dev_put: dev_put(dev); goto out; diff --git a/net/x25/x25_facilities.c b/net/x25/x25_facilities.c index 8e1a49b0c0dc..e6c9f9376206 100644 --- a/net/x25/x25_facilities.c +++ b/net/x25/x25_facilities.c @@ -263,13 +263,17 @@ int x25_create_facilities(unsigned char *buffer, * The only real problem is with reverse charging. */ int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk, - struct x25_facilities *new, struct x25_dte_facilities *dte) + struct x25_facilities *new, struct x25_dte_facilities *dte, + struct x25_neigh *nb) { struct x25_sock *x25 = x25_sk(sk); struct x25_facilities *ours = &x25->facilities; struct x25_facilities theirs; int len; + if (!x25->socket_defined_facilities) + ours = &nb->facilities; + memset(&theirs, 0, sizeof(theirs)); memcpy(new, ours, sizeof(*new)); memset(dte, 0, sizeof(*dte)); diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c index 92828a8a4ada..2af50d585b4b 100644 --- a/net/x25/x25_link.c +++ b/net/x25/x25_link.c @@ -125,8 +125,16 @@ static void x25_transmit_restart_request(struct x25_neigh *nb) *dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ; *dptr++ = 0x00; *dptr++ = X25_RESTART_REQUEST; - *dptr++ = 0x00; - *dptr++ = 0; + + *dptr = 0x00; /* cause */ + + /* set bit 8, if DTE and cause != 0x00 */ + if (!nb->dce && *dptr != 0x00) + *dptr |= (unsigned char)0x80; + + dptr++; + + *dptr++ = 0x00; /* diagnostic */ skb->sk = NULL; @@ -181,8 +189,16 @@ void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci, X25_GFI_STDSEQ); *dptr++ = (lci >> 0) & 0xFF; *dptr++ = X25_CLEAR_REQUEST; - *dptr++ = cause; - *dptr++ = 0x00; + + *dptr = cause; /* cause */ + + /* set bit 8, if DTE and cause != 0x00 */ + if (!nb->dce && *dptr != 0x00) + *dptr |= (unsigned char)0x80; + + dptr++; + + *dptr++ = 0x00; /* diagnostic */ skb->sk = NULL; @@ -261,6 +277,15 @@ void x25_link_device_add(struct net_device *dev) nb->dev = dev; nb->state = X25_LINK_STATE_0; nb->extended = 0; + nb->dce = 0; + nb->lc = 10; + nb->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; + nb->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; + nb->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; + nb->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; + /* by default don't negotiate throughput */ + nb->facilities.throughput = 0; + nb->facilities.reverse = X25_DEFAULT_REVERSE; /* * Enables negotiation */ @@ -389,28 +414,76 @@ int x25_subscr_ioctl(unsigned int cmd, void __user *arg) if ((nb = x25_get_neigh(dev)) == NULL) goto out_dev_put; - dev_put(dev); - if (cmd == SIOCX25GSUBSCRIP) { read_lock_bh(&x25_neigh_list_lock); x25_subscr.extended = nb->extended; + x25_subscr.dce = nb->dce; + x25_subscr.lc = nb->lc; + x25_subscr.facilities = nb->facilities; + x25_subscr.t20 = nb->t20; x25_subscr.global_facil_mask = nb->global_facil_mask; read_unlock_bh(&x25_neigh_list_lock); rc = copy_to_user(arg, &x25_subscr, sizeof(x25_subscr)) ? -EFAULT : 0; } else { rc = -EINVAL; - if (!(x25_subscr.extended && x25_subscr.extended != 1)) { - rc = 0; - write_lock_bh(&x25_neigh_list_lock); - nb->extended = x25_subscr.extended; - nb->global_facil_mask = x25_subscr.global_facil_mask; - write_unlock_bh(&x25_neigh_list_lock); + + if (dev->flags & IFF_UP) + return -EBUSY; + + if (x25_subscr.extended != 0 && x25_subscr.extended != 1) + goto out_dev_and_neigh_put; + if (x25_subscr.dce != 0 && x25_subscr.dce != 1) + goto out_dev_and_neigh_put; + if (x25_subscr.lc < 1 || x25_subscr.lc > 4095) + goto out_dev_and_neigh_put; + if (x25_subscr.facilities.pacsize_in < X25_PS16 || + x25_subscr.facilities.pacsize_in > X25_PS4096) + goto out_dev_and_neigh_put; + if (x25_subscr.facilities.pacsize_out < X25_PS16 || + x25_subscr.facilities.pacsize_out > X25_PS4096) + goto out_dev_and_neigh_put; + if (x25_subscr.facilities.winsize_in < 1 || + x25_subscr.facilities.winsize_in > 127) + goto out_dev_and_neigh_put; + if (x25_subscr.facilities.throughput) { + int out = x25_subscr.facilities.throughput & 0xf0; + int in = x25_subscr.facilities.throughput & 0x0f; + + if (!out) + x25_subscr.facilities.throughput |= + X25_DEFAULT_THROUGHPUT << 4; + else if (out < 0x30 || out > 0xD0) + goto out_dev_and_neigh_put; + if (!in) + x25_subscr.facilities.throughput |= + X25_DEFAULT_THROUGHPUT; + else if (in < 0x03 || in > 0x0D) + goto out_dev_and_neigh_put; } + if (x25_subscr.facilities.reverse && + (x25_subscr.facilities.reverse & 0x81) != 0x81) + goto out_dev_and_neigh_put; + if (x25_subscr.t20 < 1 * HZ || x25_subscr.t20 > 300 * HZ) + goto out_dev_and_neigh_put; + + rc = 0; + write_lock_bh(&x25_neigh_list_lock); + nb->extended = x25_subscr.extended; + nb->dce = x25_subscr.dce; + nb->lc = x25_subscr.lc; + nb->facilities = x25_subscr.facilities; + nb->t20 = x25_subscr.t20; + nb->global_facil_mask = x25_subscr.global_facil_mask; + write_unlock_bh(&x25_neigh_list_lock); } + dev_put(dev); + x25_neigh_put(nb); out: return rc; +out_dev_and_neigh_put: + x25_neigh_put(nb); out_dev_put: dev_put(dev); goto out; diff --git a/net/x25/x25_subr.c b/net/x25/x25_subr.c index 0285aaa1e93c..c195d1c89ad7 100644 --- a/net/x25/x25_subr.c +++ b/net/x25/x25_subr.c @@ -218,15 +218,31 @@ void x25_write_internal(struct sock *sk, int frametype) case X25_CLEAR_REQUEST: dptr = skb_put(skb, 3); *dptr++ = frametype; - *dptr++ = x25->causediag.cause; + + *dptr = x25->causediag.cause; + + /* set bit 8, if DTE and cause != 0x00 */ + if (!x25->neighbour->dce && *dptr != 0x00) + *dptr |= (unsigned char)0x80; + + dptr++; + *dptr++ = x25->causediag.diagnostic; break; case X25_RESET_REQUEST: dptr = skb_put(skb, 3); *dptr++ = frametype; - *dptr++ = 0x00; /* XXX */ - *dptr++ = 0x00; /* XXX */ + + *dptr = 0x00; /* cause */ + + /* set bit 8, if DTE and cause != 0x00 */ + if (!x25->neighbour->dce && *dptr != 0x00) + *dptr |= (unsigned char)0x80; + + dptr++; + + *dptr++ = 0x00; /* diagnostic */ break; case X25_RR: From patchwork Mon Nov 16 13:55:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Schiller X-Patchwork-Id: 11908597 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 250E5C4742C for ; Mon, 16 Nov 2020 14:01:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CD223222EC for ; Mon, 16 Nov 2020 14:01:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730078AbgKPOAX (ORCPT ); Mon, 16 Nov 2020 09:00:23 -0500 Received: from mxout70.expurgate.net ([91.198.224.70]:49258 "EHLO mxout70.expurgate.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730055AbgKPOAX (ORCPT ); Mon, 16 Nov 2020 09:00:23 -0500 Received: from [127.0.0.1] (helo=localhost) by relay.expurgate.net with smtp (Exim 4.92) (envelope-from ) id 1kef3L-0008dg-F0; Mon, 16 Nov 2020 15:00:19 +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 4.92) (envelope-from ) id 1kef3K-000OXQ-Pz; Mon, 16 Nov 2020 15:00:18 +0100 Received: from securemail.tdt.de (localhost [127.0.0.1]) by securemail.tdt.de (Postfix) with ESMTP id 5E974240049; Mon, 16 Nov 2020 15:00:18 +0100 (CET) Received: from mail.dev.tdt.de (unknown [10.2.4.42]) by securemail.tdt.de (Postfix) with ESMTP id D594D240047; Mon, 16 Nov 2020 15:00:17 +0100 (CET) Received: from mschiller01.dev.tdt.de (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id 8EEAE21F61; Mon, 16 Nov 2020 15:00:17 +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 v2 3/6] net/x25: replace x25_kill_by_device with x25_kill_by_neigh Date: Mon, 16 Nov 2020 14:55:22 +0100 Message-ID: <20201116135522.21791-4-ms@dev.tdt.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201116135522.21791-1-ms@dev.tdt.de> References: <20201116135522.21791-1-ms@dev.tdt.de> MIME-Version: 1.0 X-purgate-type: clean X-purgate: clean X-purgate-ID: 151534::1605535219-0001FA9D-13C20681/0/0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Remove unnecessary function x25_kill_by_device. Signed-off-by: Martin Schiller --- Change from v1: fix 'subject_prefix' warning --- net/x25/af_x25.c | 22 +++++----------------- 1 file changed, 5 insertions(+), 17 deletions(-) diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 4c2a395fdbdb..25726120fcc7 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -212,22 +212,6 @@ static void x25_remove_socket(struct sock *sk) write_unlock_bh(&x25_list_lock); } -/* - * Kill all bound sockets on a dropped device. - */ -static void x25_kill_by_device(struct net_device *dev) -{ - struct sock *s; - - write_lock_bh(&x25_list_lock); - - sk_for_each(s, &x25_list) - if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) - x25_disconnect(s, ENETUNREACH, 0, 0); - - write_unlock_bh(&x25_list_lock); -} - /* * Handle device status changes. */ @@ -273,7 +257,11 @@ static int x25_device_event(struct notifier_block *this, unsigned long event, case NETDEV_DOWN: pr_debug("X.25: got event NETDEV_DOWN for device: %s\n", dev->name); - x25_kill_by_device(dev); + nb = x25_get_neigh(dev); + if (nb) { + x25_kill_by_neigh(nb); + x25_neigh_put(nb); + } x25_route_device_down(dev); x25_link_device_down(dev); break; From patchwork Mon Nov 16 13:55:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Schiller X-Patchwork-Id: 11908599 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 54A9CC5519F for ; Mon, 16 Nov 2020 14:01:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 16EEF223BD for ; Mon, 16 Nov 2020 14:01:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730127AbgKPOBB (ORCPT ); Mon, 16 Nov 2020 09:01:01 -0500 Received: from mxout70.expurgate.net ([194.37.255.70]:36787 "EHLO mxout70.expurgate.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727305AbgKPOBA (ORCPT ); Mon, 16 Nov 2020 09:01:00 -0500 Received: from [127.0.0.1] (helo=localhost) by relay.expurgate.net with smtp (Exim 4.90) (envelope-from ) id 1kef3w-0006Zt-Oa; Mon, 16 Nov 2020 15:00:56 +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 1kef3v-0004cZ-Ll; Mon, 16 Nov 2020 15:00:55 +0100 Received: from securemail.tdt.de (localhost [127.0.0.1]) by securemail.tdt.de (Postfix) with ESMTP id E494A240049; Mon, 16 Nov 2020 15:00:54 +0100 (CET) Received: from mail.dev.tdt.de (unknown [10.2.4.42]) by securemail.tdt.de (Postfix) with ESMTP id 65F01240047; Mon, 16 Nov 2020 15:00:54 +0100 (CET) Received: from mschiller01.dev.tdt.de (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id E3CCF21F0F; Mon, 16 Nov 2020 15:00:53 +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 v2 4/6] net/x25: support NETDEV_CHANGE notifier Date: Mon, 16 Nov 2020 14:55:24 +0100 Message-ID: <20201116135522.21791-5-ms@dev.tdt.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201116135522.21791-1-ms@dev.tdt.de> References: <20201116135522.21791-1-ms@dev.tdt.de> MIME-Version: 1.0 X-purgate-ID: 151534::1605535256-00000FB8-C62E8113/0/0 X-purgate: clean X-purgate-type: clean Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org This makes it possible to handle carrier lost and detection. In case of carrier lost, we shutdown layer 3 and flush all sessions. Signed-off-by: Martin Schiller --- Change from v1: fix 'subject_prefix' and 'checkpatch' warnings --- net/x25/af_x25.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 25726120fcc7..6a95ca11694e 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -275,6 +275,19 @@ static int x25_device_event(struct notifier_block *this, unsigned long event, dev->name); x25_link_device_remove(dev); break; + case NETDEV_CHANGE: + pr_debug("X.25: got event NETDEV_CHANGE for device: %s\n", + dev->name); + if (!netif_carrier_ok(dev)) { + pr_debug("X.25: Carrier lost -> set link state down: %s\n", + dev->name); + nb = x25_get_neigh(dev); + if (nb) { + x25_link_terminated(nb); + x25_neigh_put(nb); + } + } + break; } } From patchwork Mon Nov 16 13:55:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Schiller X-Patchwork-Id: 11908595 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 ADB33C6379D for ; Mon, 16 Nov 2020 14:01:46 +0000 (UTC) Received: from vger.kernel.org (unknown [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D6E0221F9 for ; Mon, 16 Nov 2020 14:01:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6D6E0221F9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=dev.tdt.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=netdev-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730230AbgKPOBj (ORCPT ); Mon, 16 Nov 2020 09:01:39 -0500 Received: from mxout70.expurgate.net ([91.198.224.70]:7434 "EHLO mxout70.expurgate.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730210AbgKPOBg (ORCPT ); Mon, 16 Nov 2020 09:01:36 -0500 Received: from [127.0.0.1] (helo=localhost) by relay.expurgate.net with smtp (Exim 4.92) (envelope-from ) id 1kef4W-0003QC-5i; Mon, 16 Nov 2020 15:01:32 +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 4.92) (envelope-from ) id 1kef4V-0009uZ-EY; Mon, 16 Nov 2020 15:01:31 +0100 Received: from securemail.tdt.de (localhost [127.0.0.1]) by securemail.tdt.de (Postfix) with ESMTP id 1F3C5240049; Mon, 16 Nov 2020 15:01:31 +0100 (CET) Received: from mail.dev.tdt.de (unknown [10.2.4.42]) by securemail.tdt.de (Postfix) with ESMTP id 96D62240047; Mon, 16 Nov 2020 15:01:30 +0100 (CET) Received: from mschiller01.dev.tdt.de (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id 4097E21F0F; Mon, 16 Nov 2020 15:01:29 +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 v2 5/6] net/lapb: support netdev events Date: Mon, 16 Nov 2020 14:55:26 +0100 Message-ID: <20201116135522.21791-6-ms@dev.tdt.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201116135522.21791-1-ms@dev.tdt.de> References: <20201116135522.21791-1-ms@dev.tdt.de> MIME-Version: 1.0 X-purgate-type: clean X-purgate: clean X-purgate-ID: 151534::1605535292-0001632B-12D7EF87/0/0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org This makes it possible to handle carrier loss and detection. In case of Carrier Loss, layer 2 is terminated In case of Carrier Detection, we start timer t1 on a DCE interface, and on a DTE interface we change to state LAPB_STATE_1 and start sending SABM(E). Signed-off-by: Martin Schiller --- Change from v1: fix 'subject_prefix' and 'checkpatch' warnings --- net/lapb/lapb_iface.c | 83 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/net/lapb/lapb_iface.c b/net/lapb/lapb_iface.c index 3c03f6512c5f..63124cdf1926 100644 --- a/net/lapb/lapb_iface.c +++ b/net/lapb/lapb_iface.c @@ -418,14 +418,97 @@ int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb) return used; } +/* Handle device status changes. */ +static int lapb_device_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct net_device *dev = ptr; + struct lapb_cb *lapb; + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + + if (dev->type == ARPHRD_X25) { + switch (event) { + case NETDEV_REGISTER: + lapb_dbg(0, "(%p): got event NETDEV_REGISTER for device: %s\n", + dev, dev->name); + break; + case NETDEV_POST_TYPE_CHANGE: + lapb_dbg(0, "(%p): got event NETDEV_POST_TYPE_CHANGE for device: %s\n", + dev, dev->name); + break; + case NETDEV_UP: + lapb_dbg(0, "(%p): got event NETDEV_UP for device: %s\n", + dev, dev->name); + break; + case NETDEV_GOING_DOWN: + lapb_dbg(0, "(%p): got event NETDEV_GOING_DOWN for device: %s\n", + dev, dev->name); + break; + case NETDEV_DOWN: + lapb_dbg(0, "(%p): got event NETDEV_DOWN for device: %s\n", + dev, dev->name); + break; + case NETDEV_PRE_TYPE_CHANGE: + lapb_dbg(0, "(%p): got event NETDEV_PRE_TYPE_CHANGE for device: %s\n", + dev, dev->name); + break; + case NETDEV_UNREGISTER: + lapb_dbg(0, "(%p): got event NETDEV_UNREGISTER for device: %s\n", + dev, dev->name); + break; + case NETDEV_CHANGE: + lapb_dbg(0, "(%p): got event NETDEV_CHANGE for device: %s\n", + dev, dev->name); + lapb = lapb_devtostruct(dev); + if (!lapb) + break; + + if (!netif_carrier_ok(dev)) { + lapb_dbg(0, "(%p): Carrier lost -> Entering LAPB_STATE_0: %s\n", + dev, dev->name); + lapb_disconnect_indication(lapb, LAPB_OK); + lapb_clear_queues(lapb); + lapb->state = LAPB_STATE_0; + lapb->n2count = 0; + lapb_stop_t1timer(lapb); + lapb_stop_t2timer(lapb); + } else { + lapb_dbg(0, "(%p): Carrier detected: %s\n", + dev, dev->name); + if (lapb->mode & LAPB_DCE) { + lapb_start_t1timer(lapb); + } else { + if (lapb->state == LAPB_STATE_0) { + lapb->state = LAPB_STATE_1; + lapb_establish_data_link(lapb); + } + } + } + break; + } + } + + return NOTIFY_DONE; +} + +static struct notifier_block lapb_dev_notifier = { + .notifier_call = lapb_device_event, +}; + static int __init lapb_init(void) { + register_netdevice_notifier(&lapb_dev_notifier); + return 0; } static void __exit lapb_exit(void) { WARN_ON(!list_empty(&lapb_list)); + + unregister_netdevice_notifier(&lapb_dev_notifier); } MODULE_AUTHOR("Jonathan Naylor "); From patchwork Mon Nov 16 13:55:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Schiller X-Patchwork-Id: 11908601 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 C1AC6C61DD8 for ; Mon, 16 Nov 2020 14:02:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8176022265 for ; Mon, 16 Nov 2020 14:02:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730243AbgKPOB5 (ORCPT ); Mon, 16 Nov 2020 09:01:57 -0500 Received: from mxout70.expurgate.net ([194.37.255.70]:56403 "EHLO mxout70.expurgate.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729722AbgKPOB5 (ORCPT ); Mon, 16 Nov 2020 09:01:57 -0500 Received: from [127.0.0.1] (helo=localhost) by relay.expurgate.net with smtp (Exim 4.90) (envelope-from ) id 1kef4r-0001x9-8K; Mon, 16 Nov 2020 15:01:53 +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 1kef4q-0007jm-7n; Mon, 16 Nov 2020 15:01:52 +0100 Received: from securemail.tdt.de (localhost [127.0.0.1]) by securemail.tdt.de (Postfix) with ESMTP id BDC19240049; Mon, 16 Nov 2020 15:01:51 +0100 (CET) Received: from mail.dev.tdt.de (unknown [10.2.4.42]) by securemail.tdt.de (Postfix) with ESMTP id 3FC71240047; Mon, 16 Nov 2020 15:01:51 +0100 (CET) Received: from mschiller01.dev.tdt.de (unknown [10.2.3.20]) by mail.dev.tdt.de (Postfix) with ESMTPSA id ECB6B21F0F; Mon, 16 Nov 2020 15:01:50 +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 v2 6/6] net/lapb: fix t1 timer handling Date: Mon, 16 Nov 2020 14:55:28 +0100 Message-ID: <20201116135522.21791-7-ms@dev.tdt.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201116135522.21791-1-ms@dev.tdt.de> References: <20201116135522.21791-1-ms@dev.tdt.de> MIME-Version: 1.0 X-purgate-ID: 151534::1605535312-000013A4-351F6688/0/0 X-purgate-type: clean X-purgate: clean Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org fix t1 timer handling in LAPB_STATE_0: o DTE interface changes immediately to LAPB_STATE_1 and start sending SABM(E). o DCE interface sends N2-times DM and changes to LAPB_STATE_1 afterwards if there is no response in the meantime. Signed-off-by: Martin Schiller --- Change from v1: fix 'subject_prefix' and 'checkpatch' warnings --- net/lapb/lapb_timer.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/net/lapb/lapb_timer.c b/net/lapb/lapb_timer.c index 8f5b17001a07..baa247fe4ed0 100644 --- a/net/lapb/lapb_timer.c +++ b/net/lapb/lapb_timer.c @@ -85,11 +85,18 @@ static void lapb_t1timer_expiry(struct timer_list *t) switch (lapb->state) { /* - * If we are a DCE, keep going DM .. DM .. DM + * If we are a DCE, send DM up to N2 times, then switch to + * STATE_1 and send SABM(E). */ case LAPB_STATE_0: - if (lapb->mode & LAPB_DCE) + if (lapb->mode & LAPB_DCE && + lapb->n2count != lapb->n2) { + lapb->n2count++; lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE); + } else { + lapb->state = LAPB_STATE_1; + lapb_establish_data_link(lapb); + } break; /*