From patchwork Sat Oct 31 18:10:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xie He X-Patchwork-Id: 315910 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=-12.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 B55F3C388F7 for ; Sat, 31 Oct 2020 18:12:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 759BA20679 for ; Sat, 31 Oct 2020 18:12:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Wbylnzq3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728319AbgJaSMO (ORCPT ); Sat, 31 Oct 2020 14:12:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727120AbgJaSMN (ORCPT ); Sat, 31 Oct 2020 14:12:13 -0400 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47F02C0617A6; Sat, 31 Oct 2020 11:12:13 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id 133so7714639pfx.11; Sat, 31 Oct 2020 11:12:13 -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=Jz6x+g+xbqRpPTzzyKWaisQhdh5VoS5Zw+hJtNIjDSU=; b=Wbylnzq3WLJpP9giv3tONeDQu6NBOEsxnRLPldc5hJISiPhq1CVWhCKOKptQhxCCrE rEizpfuepS759FTRhxMJ0ukacbKfMX98wIE4Ot2FuvdiBOYI5rNTtXF40wdX6t4Jbj8i SmZVaoJ1SbIO1uzhKAU0i+/NNyK0oQo55iiA4BjmcwBEJ6X9S20Y9ulwE4aLwZMx0BB8 kWqZq19WTBgXGn8QNRhy8xfX36rkkhOJJzG21H1XmKY1GKyGiVBBiPjujAA2YP/yDSh4 aMIL4z3fgcDBf4YyDKFb4cnxEPEut3tLKL+7Pgi0lSstV7OHgskgCdyMiDX/knbNwhpw iksw== 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=Jz6x+g+xbqRpPTzzyKWaisQhdh5VoS5Zw+hJtNIjDSU=; b=NuVHDVjEMTkqz8SpEIHG4mk3d/N8yhZwO8Oq2SOw0aQGpa5b5PPQspH6MDev1K3T7P 7GyG8hfBl5CfkQXQhxIZdoIjaesBL1vz52PAvtpVbWURJtGw+LsALI6pOTQGUjRvZgI+ nsLMsqLakJuBn+7VukpLHNd70D2O3NU4DHtPd9p7CQD7nIXavISROFjtwH7PwpOY553E WC5t6sPRMJy9u8oW/FtaS+FpBR/OAWkD/7iTriP06h8uAayq4ePGZrd0IOLgnZRj3axH 8QnWdSNwccxQeZYM8Zqw9oHze8AOKMdDy9pzxFjLk3MkiwkrNFNRs6FJFR3FrdVG1BlU Tb8w== X-Gm-Message-State: AOAM533xPlOyofj7ApeY4BbBwf1Stc85on1oKQ328VTB6IhEX03B57bn RfVlW23zRTvd3BKGbnHgK10= X-Google-Smtp-Source: ABdhPJxs6lTpBPQ0vGfBF254AcR8omT9nNEqrInpWYRBnFsDt2ZDWMqzrPYLBJUsWuEcri7IuYo1Fw== X-Received: by 2002:aa7:8815:0:b029:163:c712:81ad with SMTP id c21-20020aa788150000b0290163c71281admr14762157pfo.74.1604167932871; Sat, 31 Oct 2020 11:12:12 -0700 (PDT) Received: from shane-XPS-13-9380.hsd1.ca.comcast.net ([2601:646:8800:1c00:32f8:16e7:6105:7fb5]) by smtp.gmail.com with ESMTPSA id n6sm6967137pjj.34.2020.10.31.11.12.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 31 Oct 2020 11:12:12 -0700 (PDT) From: Xie He To: Jakub Kicinski , "David S. Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Krzysztof Halasa , Willem de Bruijn Cc: Xie He Subject: [PATCH net-next v7 5/5] net: hdlc_fr: Add support for any Ethertype Date: Sat, 31 Oct 2020 11:10:43 -0700 Message-Id: <20201031181043.805329-6-xie.he.0141@gmail.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201031181043.805329-1-xie.he.0141@gmail.com> References: <20201031181043.805329-1-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: Krzysztof Halasa Cc: 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);