From patchwork Sat Oct 31 00:37:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xie He X-Patchwork-Id: 1391383 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=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=ke4x5VI4; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CNKzz50Q2z9sPB for ; Sat, 31 Oct 2020 11:38:55 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726158AbgJaAix (ORCPT ); Fri, 30 Oct 2020 20:38:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45024 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726203AbgJaAiv (ORCPT ); Fri, 30 Oct 2020 20:38:51 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7CF65C0613D5; Fri, 30 Oct 2020 17:38:51 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id p21so145876pju.0; Fri, 30 Oct 2020 17:38:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=w5CwQphJvfpbmXP3zNNqueP0Pdz1yc1mU4gwObshUtc=; b=ke4x5VI4T+/Zrg/OX1gA3I+Pq6rPgnyJwCJwwVNRdkcPKU1krfkAvrfpK1CFezuxFH utGcPUNHoFTHCWuV9DFTaJGZ7kzek7OTorxWM6fSLH/94VnDwGOvHpfqVp+WA4swh+mr l3IKmdGGna/vUvOpbQSqQyFDkPdI6vX2yBvvBHFqE63I2iJYtdQet82RleJ6aOMUvqd7 Rmpc5VpsYi7X4shcAbUl3GBIHrlOSk4yxIkASOjFhR0Gy9IddDrmAE8tCOUp483V9BPA qPnNAaul0Wmrw4NtNM9gUTxq+w3Na07h297jH/ewPm2vwfQqMP8zQxR992EKWgjUg9Ih I06w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=w5CwQphJvfpbmXP3zNNqueP0Pdz1yc1mU4gwObshUtc=; b=ZgTO1HDeM3Hj+duo6wnvksHAz2Zpx5FPpWktRdg6pueSZJNKC6SvRBFwakigltJ2Jj EoQraMigGKDa8pkziHj9B00d9f/A5Gs0JXp6z8JcwOI4hsUFnmkck85G9xwfTtG4MWVc c8Cx1ZRN18ETIoqAXdgWMOAUYOCrn+CD+y9T89KQ6UgkaCBTyI8mJYBlRkHQGHXCrHeZ c8xaO323yihnmNYAzAET36OWGrIL761SPjcTXqHFN0D3rF0SrPoMsZLle9lm+1s52Fbo elxcUpTgTyE+75dj/0LGvVL/s9BFnuW+uABtHCk6zU9EsNk3nDam3fcJBgkc1XCA4r6R xDqw== X-Gm-Message-State: AOAM531AL5zOFsNF7ILuOXsJwE0VqI85bg15U8qmYxrSyCc3j3yeRcCF GICzao//xFcYo9grCe8w1UQ= X-Google-Smtp-Source: ABdhPJwozCjap6b54P8DP2L71pEUmXXYz0dZqsOVttZVEMJk+MiHTrMeAu52PVZHREvQLLfFL6uANg== X-Received: by 2002:a17:90a:6301:: with SMTP id e1mr5890706pjj.131.1604104731116; Fri, 30 Oct 2020 17:38:51 -0700 (PDT) Received: from shane-XPS-13-9380.hsd1.ca.comcast.net ([2601:646:8800:1c00:48fd:1408:262f:a64b]) by smtp.gmail.com with ESMTPSA id ch21sm4596888pjb.24.2020.10.30.17.38.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2020 17:38:50 -0700 (PDT) From: Xie He To: Jakub Kicinski , "David S. Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Willem de Bruijn , Krzysztof Halasa Cc: Xie He , Willem de Bruijn Subject: [PATCH net-next v5 5/5] net: hdlc_fr: Add support for any Ethertype Date: Fri, 30 Oct 2020 17:37:31 -0700 Message-Id: <20201031003731.461437-6-xie.he.0141@gmail.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201031003731.461437-1-xie.he.0141@gmail.com> References: <20201031003731.461437-1-xie.he.0141@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Change the fr_rx function to make this driver support any Ethertype when receiving skbs on normal (non-Ethernet-emulating) PVC devices. (This driver is already able to handle any Ethertype when sending.) Originally in the fr_rx function, the code that parses the long (10-byte) header only recognizes a few Ethertype values and drops frames with other Ethertype values. This patch replaces this code to make fr_rx support any Ethertype. This patch also creates a new function fr_snap_parse as part of the new code. Cc: Willem de Bruijn Cc: Krzysztof Halasa Acked-by: Willem de Bruijn Signed-off-by: Xie He --- drivers/net/wan/hdlc_fr.c | 75 +++++++++++++++++++++++++-------------- 1 file changed, 49 insertions(+), 26 deletions(-) diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c index 98444f1d8cc3..0720f5f92caa 100644 --- a/drivers/net/wan/hdlc_fr.c +++ b/drivers/net/wan/hdlc_fr.c @@ -871,6 +871,45 @@ static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb) return 0; } +static int fr_snap_parse(struct sk_buff *skb, struct pvc_device *pvc) +{ + /* OUI 00-00-00 indicates an Ethertype follows */ + if (skb->data[0] == 0x00 && + skb->data[1] == 0x00 && + skb->data[2] == 0x00) { + if (!pvc->main) + return -1; + skb->dev = pvc->main; + skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */ + skb_pull(skb, 5); + skb_reset_mac_header(skb); + return 0; + + /* OUI 00-80-C2 stands for the 802.1 organization */ + } else if (skb->data[0] == 0x00 && + skb->data[1] == 0x80 && + skb->data[2] == 0xC2) { + /* PID 00-07 stands for Ethernet frames without FCS */ + if (skb->data[3] == 0x00 && + skb->data[4] == 0x07) { + if (!pvc->ether) + return -1; + skb_pull(skb, 5); + if (skb->len < ETH_HLEN) + return -1; + skb->protocol = eth_type_trans(skb, pvc->ether); + return 0; + + /* PID unsupported */ + } else { + return -1; + } + + /* OUI unsupported */ + } else { + return -1; + } +} static int fr_rx(struct sk_buff *skb) { @@ -945,35 +984,19 @@ static int fr_rx(struct sk_buff *skb) skb->protocol = htons(ETH_P_IPV6); skb_reset_mac_header(skb); - } else if (skb->len > 10 && data[3] == FR_PAD && - data[4] == NLPID_SNAP && data[5] == FR_PAD) { - u16 oui = ntohs(*(__be16*)(data + 6)); - u16 pid = ntohs(*(__be16*)(data + 8)); - skb_pull(skb, 10); - - switch ((((u32)oui) << 16) | pid) { - case ETH_P_ARP: /* routed frame with SNAP */ - case ETH_P_IPX: - case ETH_P_IP: /* a long variant */ - case ETH_P_IPV6: - if (!pvc->main) - goto rx_drop; - skb->dev = pvc->main; - skb->protocol = htons(pid); - skb_reset_mac_header(skb); - break; - - case 0x80C20007: /* bridged Ethernet frame */ - if (!pvc->ether) + } else if (data[3] == FR_PAD) { + if (skb->len < 5) + goto rx_error; + if (data[4] == NLPID_SNAP) { /* A SNAP header follows */ + skb_pull(skb, 5); + if (skb->len < 5) /* Incomplete SNAP header */ + goto rx_error; + if (fr_snap_parse(skb, pvc)) goto rx_drop; - skb->protocol = eth_type_trans(skb, pvc->ether); - break; - - default: - netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n", - oui, pid); + } else { goto rx_drop; } + } else { netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n", data[3], skb->len);