From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DD12AC433FE for ; Fri, 13 May 2022 14:25:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358607AbiEMOZE (ORCPT ); Fri, 13 May 2022 10:25:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359467AbiEMOYs (ORCPT ); Fri, 13 May 2022 10:24:48 -0400 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE1AD527D1; Fri, 13 May 2022 07:24:45 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id c11so8064090plg.13; Fri, 13 May 2022 07:24:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=EXVXiPbk+krY68vv3JVFR+K7ANBpW2/j7bjI9Co2KDw=; b=Lily5PBWVzsRsoKTheNp++BxMUwyzfse43IwxdM4KdKiwxr22BTE2kx3Ow2wxjOf+C lH4YXnDCqazomi/ap9qEmHZRTELee86xvEOnQBuPbC8Az508qFAxZGEmkWFu97uiTAZD Q6lTJx4RBjBKMO9cRXZBmzzUdoywVD62Du3xLaMjBYbgESWo9VJZ1XX4GG6o1WF0IzLM 6hwHVRGorDIVDB8N7Nn/c5KQO8pCIHWtYUabYbddkqX0UtY+Sl8ux8FjnuGi5vh3CnFU My8cQRNntwUUEpSChBTx6GdqGKcYGwkc3mlOfz2lTrdHx+nCauRiSDnRfL3gYSbgX7YK 11cQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=EXVXiPbk+krY68vv3JVFR+K7ANBpW2/j7bjI9Co2KDw=; b=cRoqmhZNvnKkFlkfiEyeBjVxTQ9nZKLrnRU5N+sYwh46qw9nbVr8B0C5Hs6zc9kecQ 3zkjAJCQYT2T0PTroKODoudpv6R+fMBGPWeeAZm6qn9td4xNvgp2fGAtbAu1TcN+l9ht cE9/Nc/+ApTgLvSeDg4cuOrV5KfpNFmFfOCBpVOZKnndcLNg7e1qyYg7SlgKakKmvFPs dhq5noQ9WkT5X/+JfNYSybEO6wuHHZv+whkRcKTuSgmfEvzdrwfFyXPLy8qy3XQpaG9Y z68YhfptSMaMQIfKlSb+u2qGAGyvOEwvcq55Bi9xfYl29MeydBcA4sEcqNyYecW3jxZ5 OBEg== X-Gm-Message-State: AOAM531M0v7egKx92aRkBv9BGtP96QWnkZXC3LTFJ7IJQ4lNs3THYS75 dBQWiJM5ERPgfjJGdoMEOj0= X-Google-Smtp-Source: ABdhPJwP14hRxwH8tjUgqDpmuXMdXTYtmj77UCtxNmry5UzcQ8PKGLOciYn4wKhQnTKfIIfZgjlOZA== X-Received: by 2002:a17:902:f542:b0:15e:b6d2:88d9 with SMTP id h2-20020a170902f54200b0015eb6d288d9mr4934948plf.128.1652451884713; Fri, 13 May 2022 07:24:44 -0700 (PDT) Received: from localhost.localdomain (124x33x176x97.ap124.ftth.ucom.ne.jp. [124.33.176.97]) by smtp.gmail.com with ESMTPSA id jj10-20020a170903048a00b0015e8d4eb2ccsm1684488plb.278.2022.05.13.07.24.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 May 2022 07:24:44 -0700 (PDT) Sender: Vincent Mailhol From: Vincent Mailhol To: Marc Kleine-Budde Cc: linux-can@vger.kernel.org, linux-kernel@vger.kernel.org, Max Staudt , Vincent Mailhol Subject: [PATCH 2/2] can: dev: drop tx skb if in listen only mode Date: Fri, 13 May 2022 23:23:55 +0900 Message-Id: <20220513142355.250389-3-mailhol.vincent@wanadoo.fr> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220513142355.250389-1-mailhol.vincent@wanadoo.fr> References: <20220513142355.250389-1-mailhol.vincent@wanadoo.fr> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org Frames can be directly injected to a can driver via the packet socket. By doing that, it is possible to reach the net_device_ops::ndo_start_xmit function even if the driver is configure in listen only mode. Add a check in can_dropped_invalid_skb() and to discard the skb if CAN_CTRLMODE_LISTENONLY is set. Signed-off-by: Vincent Mailhol --- include/linux/can/dev.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h index bbe27e22c7a7..c3ed48e54c29 100644 --- a/include/linux/can/dev.h +++ b/include/linux/can/dev.h @@ -161,6 +161,7 @@ static inline bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb) { const struct canfd_frame *cfd = (struct canfd_frame *)skb->data; + struct can_priv *priv = netdev_priv(dev); if (skb->protocol == htons(ETH_P_CAN)) { if (unlikely(skb->len != CAN_MTU || @@ -174,8 +175,13 @@ static inline bool can_dropped_invalid_skb(struct net_device *dev, goto inval_skb; } - if (!can_skb_headroom_valid(dev, skb)) + if (!can_skb_headroom_valid(dev, skb)) { + goto inval_skb; + } else if (priv->ctrlmode & CAN_CTRLMODE_LISTENONLY) { + netdev_info_once(dev, + "interface in listen only mode, dropping skb\n"); goto inval_skb; + } return false; -- 2.35.1