From patchwork Thu Dec 3 14:06:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Hartkopp X-Patchwork-Id: 11948833 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 D5CDBC00130 for ; Thu, 3 Dec 2020 14:09:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 84031206F6 for ; Thu, 3 Dec 2020 14:09:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436558AbgLCOJK (ORCPT ); Thu, 3 Dec 2020 09:09:10 -0500 Received: from mo4-p01-ob.smtp.rzone.de ([85.215.255.52]:36219 "EHLO mo4-p01-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728727AbgLCOJI (ORCPT ); Thu, 3 Dec 2020 09:09:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1607004375; s=strato-dkim-0002; d=hartkopp.net; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: X-RZG-CLASS-ID:X-RZG-AUTH:From:Subject:Sender; bh=zGU4oUwJBFPegTJv0CVGLiubRmmiYKrA+6JGbAEjAq8=; b=NK57UQnjca9InHTNbLwKI6eY6Is7jTT+UpdBNtsoXpCtu+NYofLfgn+XSqjEY3txux voJq/LuAe9QvSaAoKZdupz/Z3XWokdjFviVGQASbq8k5Lc4iYujq/WqGaYJ+wjIhIRKf SwxkF8O9iitYsCDcd7t0Hz70xpNV1U4ChxSDPrPBXxUTxSb8VmCc5ZjLxMjdeSkpU8wD g49LNkw9UZqwKNIJEtnDDCGS6QmiWBBttzSIRnLAa1WTET9bFR0tj+Vo10Hrk1ypGE0r WNO2G6Sv4987L7mZIUZCsc5VHNmIQiaU5cTav2QVlGq36prnHasJzwQMP7ty2tzHs950 Khtw== X-RZG-AUTH: ":P2MHfkW8eP4Mre39l357AZT/I7AY/7nT2yrDxb8mjGrp7owjzFK3JbFk1mS/xvEBL7X5sbo3UIh9dyKNLCWJaRrQ0pDCeGtVbNHMQ98lI/DcPKMT" X-RZG-CLASS-ID: mo00 Received: from localhost.localdomain by smtp.strato.de (RZmta 47.3.4 AUTH) with ESMTPSA id n07f3bwB3E6EFos (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Thu, 3 Dec 2020 15:06:14 +0100 (CET) From: Oliver Hartkopp To: mkl@pengutronix.de, kuba@kernel.org, davem@davemloft.net, netdev@vger.kernel.org, linux-can@vger.kernel.org Cc: Oliver Hartkopp , Thomas Wagner Subject: [PATCH 2/2] can-isotp: add SF_BROADCAST support for functional addressing Date: Thu, 3 Dec 2020 15:06:04 +0100 Message-Id: <20201203140604.25488-3-socketcan@hartkopp.net> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201203140604.25488-1-socketcan@hartkopp.net> References: <20201203140604.25488-1-socketcan@hartkopp.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org When CAN_ISOTP_SF_BROADCAST is set in the CAN_ISOTP_OPTS flags the CAN_ISOTP socket is switched into functional addressing mode, where only single frame (SF) protocol data units can be send on the specified CAN interface and the given tp.tx_id after bind(). In opposite to normal and extended addressing this socket does not register a CAN-ID for reception which would be needed for a 1-to-1 ISOTP connection with a segmented bi-directional data transfer. Sending SFs on this socket is therefore a TX-only 'broadcast' operation. Suggested-by: Thomas Wagner Tested-by: Thomas Wagner Signed-off-by: Oliver Hartkopp --- include/uapi/linux/can/isotp.h | 2 +- net/can/isotp.c | 29 ++++++++++++++++++++--------- 2 files changed, 21 insertions(+), 10 deletions(-) diff --git a/include/uapi/linux/can/isotp.h b/include/uapi/linux/can/isotp.h index 7793b26aa154..c55935b64ccc 100644 --- a/include/uapi/linux/can/isotp.h +++ b/include/uapi/linux/can/isotp.h @@ -133,11 +133,11 @@ struct can_isotp_ll_options { #define CAN_ISOTP_HALF_DUPLEX 0x040 /* half duplex error state handling */ #define CAN_ISOTP_FORCE_TXSTMIN 0x080 /* ignore stmin from received FC */ #define CAN_ISOTP_FORCE_RXSTMIN 0x100 /* ignore CFs depending on rx stmin */ #define CAN_ISOTP_RX_EXT_ADDR 0x200 /* different rx extended addressing */ #define CAN_ISOTP_WAIT_TX_DONE 0x400 /* wait for tx completion */ - +#define CAN_ISOTP_SF_BROADCAST 0x800 /* 1-to-N functional addressing */ /* default values */ #define CAN_ISOTP_DEFAULT_FLAGS 0 #define CAN_ISOTP_DEFAULT_EXT_ADDRESS 0x00 diff --git a/net/can/isotp.c b/net/can/isotp.c index 26bdc3c20b7e..5ce26e568f16 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -863,10 +863,18 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) } if (!size || size > MAX_MSG_LENGTH) return -EINVAL; + /* take care of a potential SF_DL ESC offset for TX_DL > 8 */ + off = (so->tx.ll_dl > CAN_MAX_DLEN) ? 1 : 0; + + /* does the given data fit into a single frame for SF_BROADCAST? */ + if ((so->opt.flags & CAN_ISOTP_SF_BROADCAST) && + (size > so->tx.ll_dl - SF_PCI_SZ4 - ae - off)) + return -EINVAL; + err = memcpy_from_msg(so->tx.buf, msg, size); if (err < 0) return err; dev = dev_get_by_index(sock_net(sk), so->ifindex); @@ -889,13 +897,10 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) so->tx.idx = 0; cf = (struct canfd_frame *)skb->data; skb_put(skb, so->ll.mtu); - /* take care of a potential SF_DL ESC offset for TX_DL > 8 */ - off = (so->tx.ll_dl > CAN_MAX_DLEN) ? 1 : 0; - /* check for single frame transmission depending on TX_DL */ if (size <= so->tx.ll_dl - SF_PCI_SZ4 - ae - off) { /* The message size generally fits into a SingleFrame - good. * * SF_DL ESC offset optimization: @@ -1014,11 +1019,11 @@ static int isotp_release(struct socket *sock) hrtimer_cancel(&so->txtimer); hrtimer_cancel(&so->rxtimer); /* remove current filters & unregister */ - if (so->bound) { + if (so->bound && (!(so->opt.flags & CAN_ISOTP_SF_BROADCAST))) { if (so->ifindex) { struct net_device *dev; dev = dev_get_by_index(net, so->ifindex); if (dev) { @@ -1050,10 +1055,11 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len) struct net *net = sock_net(sk); int ifindex; struct net_device *dev; int err = 0; int notify_enetdown = 0; + int do_rx_reg = 1; if (len < CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.tp)) return -EINVAL; if (addr->can_addr.tp.rx_id == addr->can_addr.tp.tx_id) @@ -1064,10 +1070,14 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len) return -EADDRNOTAVAIL; if (!addr->can_ifindex) return -ENODEV; + /* do not register frame reception for functional addressing */ + if (so->opt.flags & CAN_ISOTP_SF_BROADCAST) + do_rx_reg = 0; + lock_sock(sk); if (so->bound && addr->can_ifindex == so->ifindex && addr->can_addr.tp.rx_id == so->rxid && addr->can_addr.tp.tx_id == so->txid) @@ -1091,17 +1101,18 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len) if (!(dev->flags & IFF_UP)) notify_enetdown = 1; ifindex = dev->ifindex; - can_rx_register(net, dev, addr->can_addr.tp.rx_id, - SINGLE_MASK(addr->can_addr.tp.rx_id), isotp_rcv, sk, - "isotp", sk); + if (do_rx_reg) + can_rx_register(net, dev, addr->can_addr.tp.rx_id, + SINGLE_MASK(addr->can_addr.tp.rx_id), + isotp_rcv, sk, "isotp", sk); dev_put(dev); - if (so->bound) { + if (so->bound && do_rx_reg) { /* unregister old filter */ if (so->ifindex) { dev = dev_get_by_index(net, so->ifindex); if (dev) { can_rx_unregister(net, dev, so->rxid, @@ -1300,11 +1311,11 @@ static int isotp_notifier(struct notifier_block *nb, unsigned long msg, switch (msg) { case NETDEV_UNREGISTER: lock_sock(sk); /* remove current filters & unregister */ - if (so->bound) + if (so->bound && (!(so->opt.flags & CAN_ISOTP_SF_BROADCAST))) can_rx_unregister(dev_net(dev), dev, so->rxid, SINGLE_MASK(so->rxid), isotp_rcv, sk); so->ifindex = 0;