From patchwork Wed Oct 28 10:57:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xie He X-Patchwork-Id: 311324 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 63879C55179 for ; Wed, 28 Oct 2020 22:16:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0588E2475F for ; Wed, 28 Oct 2020 22:16:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="N8I4ct81" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731423AbgJ1WQf (ORCPT ); Wed, 28 Oct 2020 18:16:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731409AbgJ1WQe (ORCPT ); Wed, 28 Oct 2020 18:16:34 -0400 Received: from mail-vk1-xa36.google.com (mail-vk1-xa36.google.com [IPv6:2607:f8b0:4864:20::a36]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA3F0C0613CF; Wed, 28 Oct 2020 15:16:33 -0700 (PDT) Received: by mail-vk1-xa36.google.com with SMTP id k125so268039vka.11; Wed, 28 Oct 2020 15:16:33 -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=54O1P5r41ZqmIzJz6Cd1KDy/NA/5HzTXzjDHY93KBEk=; b=N8I4ct81omE1XtvRZHjctZAkol6O9k13TNi4ukv2kfCe3GkrWMDRu4nuV/oXSDY6L9 Gk0kT1QBCTpYowC5p1vkhoSpgu2lWLhDr0J/JYMEu1umas6BnnQhbs0+prRmiy5ApMRW 3L5mDkMivj5G1WWMZWG1uZFfbFN8Trr4JoIJRZPgIOwu//nqC/6KZLios4JAH1JKL7SG 2nnkW7NFC5SCL+WxnKIOkjnMmXC4ourZTYpfuTNScdwUz93UZBwJyvpGnzV8ROUkDQYY D6aD4ZLaWqddB9c8dAmzS3v3ncbPQPJ22Q0Mas5SuRD1VhddowHfLKVzBvPpdo+z1GsG U1Iw== 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=54O1P5r41ZqmIzJz6Cd1KDy/NA/5HzTXzjDHY93KBEk=; b=DAbFBblQWohDnfB0IOl6POm0jxaxozB9TQBoYXokxPp7JWDjSbcHka2BQ3CTf4umzv 8LQogv75c/+enftCE5Zo6vjLvpBJN5YU85bjNtBRIWP+vKCxcHHK3S6u2LyCwq8S9JBL tm9B3XgDbwh0AcyOZLRVnE7SMFQUtb5bBIxJYkUyM/bpK3sj89VmeG+baa/++9yPrsQM a6x7Iyr54ja2UTbTqQdbNMQ7G4T2RotcP8xD8RIDi1Z0niQomUYHQylLM8nVs3whDcmu s6qoS2sOYqYnZ7X0aAaPiinal1SbmWIAlGGjYnGxHpyJKc4ReOjzOBEK+n1qopquQSSA FyfQ== X-Gm-Message-State: AOAM533JnGTQdOyIjmDcEd4vrPenL88vJVyIL18IB//W1vA1C1dVLhVA MZJDMon/xbCjvRNJkgCysPAkNmgb3T4= X-Google-Smtp-Source: ABdhPJy6nbU25F3kPXbCO+raQW+HdqwjR+pRwlQ/qztyo1tdyaT7BxFbdKO3SuH8xC+6oYKxf8tleA== X-Received: by 2002:aa7:80c9:0:b029:164:4ca1:fff with SMTP id a9-20020aa780c90000b02901644ca10fffmr5383299pfn.11.1603882688819; Wed, 28 Oct 2020 03:58:08 -0700 (PDT) Received: from shane-XPS-13-9380.hsd1.ca.comcast.net ([2601:646:8800:1c00:a46c:8b86:395a:7a3d]) by smtp.gmail.com with ESMTPSA id 65sm557863pge.37.2020.10.28.03.58.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Oct 2020 03:58:08 -0700 (PDT) From: Xie He To: Jakub Kicinski , "David S. Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Krzysztof Halasa Cc: Xie He Subject: [PATCH net-next 4/4] net: hdlc_fr: Add support for any Ethertype Date: Wed, 28 Oct 2020 03:57:05 -0700 Message-Id: <20201028105705.460551-5-xie.he.0141@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201028105705.460551-1-xie.he.0141@gmail.com> References: <20201028105705.460551-1-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. Also add skb_reset_mac_header before we pass an skb (received on normal PVC devices) to upper layers. Because we don't use header_ops for normal PVC devices, we should hide the header from upper layer code in this case. Cc: Krzysztof Halasa Signed-off-by: Xie He --- drivers/net/wan/hdlc_fr.c | 76 ++++++++++++++++++++++++++------------- 1 file changed, 51 insertions(+), 25 deletions(-) diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c index 3639c2bfb141..e95efc14bc97 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) { @@ -935,6 +974,7 @@ static int fr_rx(struct sk_buff *skb) skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ skb->dev = pvc->main; skb->protocol = htons(ETH_P_IP); + skb_reset_mac_header(skb); } else if (data[3] == NLPID_IPV6) { if (!pvc->main) @@ -942,35 +982,21 @@ static int fr_rx(struct sk_buff *skb) skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ skb->dev = pvc->main; 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); - 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);