From patchwork Thu Jan 23 18:05:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Varghese X-Patchwork-Id: 1228391 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=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; 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=h52YjUof; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 483VYW4vrcz9sS3 for ; Fri, 24 Jan 2020 05:05:19 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729375AbgAWSFS (ORCPT ); Thu, 23 Jan 2020 13:05:18 -0500 Received: from mail-pj1-f66.google.com ([209.85.216.66]:39917 "EHLO mail-pj1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729262AbgAWSFQ (ORCPT ); Thu, 23 Jan 2020 13:05:16 -0500 Received: by mail-pj1-f66.google.com with SMTP id e11so1665543pjt.4 for ; Thu, 23 Jan 2020 10:05:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references; bh=/KmtU/7bKVxP2z+dtCF71Ldw88YQ7pYLfvBgLBUuXNc=; b=h52YjUofeFpifYQbU1TloKB6hh87LWe5SixdR0kOxioJHPQPCZh7wjEAO3G9uouBFW G9gght/t45WhNT6Nci/6sEkmq2JVgGzeVT1W0VmAKvd/Re3pR8N09SFAe1WpxweQucXV LR4koN48fzwX8myUGdIjZu9QR2SiHWlBCteD460lJSLiUZSQNwM6fNAQq//01mbB3GS4 ppafvwtyNVzqFKGhh0b49VbfubQF7LONVLdWvYK4M+Lf23imDOXR9/c1uX7A3teseEeA Dtj20ehYOZ1cDIIfeOIzJqfBJ0ZCzMziIzG8rjB3E4dv3v4JpyfYrMl9giejh+Pa0usJ oDvA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references; bh=/KmtU/7bKVxP2z+dtCF71Ldw88YQ7pYLfvBgLBUuXNc=; b=Dsiej2RhODnhYb+2SDKuUpl3k6XaAMuvJ/TRGaiOyQprf610SD5AuUhFVfxhLHpJa6 45I9OA2KrADRUISkS+g3xNZR9a3Y8ywgXlUC2r3HtAPhPPY2ZhPO5K7NQBNoIA38aNg4 4j1myPYjudH1rXY/bvpGauntFfyetxcX2n1tHxJ8FutlN0H/AOW8flVhpGP+BICmhBgB lPBYgz3rP7Nx2LP4kKza3Q8N8fXKX1rG8uVE+lyrO3+8ZVEaJKVJRNsQxzxrP27EMJqY OTqo43PUVy+ZSH4jc2xe4a32qPQ9263HLV1X52340wk7Aw+8JKdFNUJFWOnHkbmSXwtn tHcw== X-Gm-Message-State: APjAAAWg++f9LB3BmxptvZ4bzovCkhkfKrjw39CVdk0IZtFI4IKwGwSE 2dRvcx0GVB75yvvAOO0yyhaSzB1e X-Google-Smtp-Source: APXvYqwrwbO/NqoVxCu9F21IWGVZlirQX7nwe3vCfiHe+nkTagaoM9mJR8XohYp7IZjoAqs3Mn5xwA== X-Received: by 2002:a17:902:16a:: with SMTP id 97mr17573608plb.3.1579802715216; Thu, 23 Jan 2020 10:05:15 -0800 (PST) Received: from martin-VirtualBox.dlink.router ([122.178.219.138]) by smtp.gmail.com with ESMTPSA id e14sm3556053pfm.97.2020.01.23.10.05.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 23 Jan 2020 10:05:14 -0800 (PST) From: Martin Varghese To: netdev@vger.kernel.org, davem@davemloft.net, corbet@lwn.net, kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, scott.drennan@nokia.com, jbenc@redhat.com, martin.varghese@nokia.com Subject: [PATCH net-next v5 2/2] net: Special handling for IP & MPLS. Date: Thu, 23 Jan 2020 23:35:08 +0530 Message-Id: <009f63cbde166b02abb16c4ee3d9da5a854cd780.1579798999.git.martin.varghese@nokia.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Martin Varghese Special handling is needed in bareudp module for IP & MPLS as they support more than one ethertypes. MPLS has 2 ethertypes. 0x8847 for MPLS unicast and 0x8848 for MPLS multicast. While decapsulating MPLS packet from UDP packet the tunnel destination IP address is checked to determine the ethertype. The ethertype of the packet will be set to 0x8848 if the tunnel destination IP address is a multicast IP address. The ethertype of the packet will be set to 0x8847 if the tunnel destination IP address is a unicast IP address. IP has 2 ethertypes.0x0800 for IPV4 and 0x86dd for IPv6. The version field of the IP header tunnelled will be checked to determine the ethertype. This special handling to tunnel additional ethertypes will be disabled by default and can be enabled using a flag called multiproto. This flag can be used only with ethertypes 0x8847 and 0x0800. Signed-off-by: Martin Varghese Acked-by: Willem de Bruijn --- Changes in v2: - Fixed documentation errors. - Changed commit message. Changes in v3: - Re-sending the patch. Changes in v4: - Renamed extmode flag to multiproto - Fixed typo in description. Changes in v5: - Mention about extmode is changed in multiproto in commit msg. - Ack from Willem added. Documentation/networking/bareudp.rst | 20 ++++++++++- drivers/net/bareudp.c | 67 ++++++++++++++++++++++++++++++++++-- include/net/bareudp.h | 1 + include/uapi/linux/if_link.h | 1 + 4 files changed, 85 insertions(+), 4 deletions(-) diff --git a/Documentation/networking/bareudp.rst b/Documentation/networking/bareudp.rst index 4087a1b..9794dd8 100644 --- a/Documentation/networking/bareudp.rst +++ b/Documentation/networking/bareudp.rst @@ -12,6 +12,15 @@ The Bareudp tunnel module provides a generic L3 encapsulation tunnelling support for tunnelling different L3 protocols like MPLS, IP, NSH etc. inside a UDP tunnel. +Special Handling +---------------- +The bareudp device supports special handling for MPLS & IP as they can have +multiple ethertypes. +MPLS procotcol can have ethertypes ETH_P_MPLS_UC (unicast) & ETH_P_MPLS_MC (multicast). +IP protocol can have ethertypes ETH_P_IP (v4) & ETH_P_IPV6 (v6). +This special handling can be enabled only for ethertypes ETH_P_IP & ETH_P_MPLS_UC +with a flag called multiproto mode. + Usage ------ @@ -25,7 +34,16 @@ Usage b) ip link delete bareudp0 -2) Device Usage +2) Device creation with multiple proto mode enabled + +There are two ways to create a bareudp device for MPLS & IP with multiproto mode +enabled. + + a) ip link add dev bareudp0 type bareudp dstport 6635 ethertype 0x8847 multiproto + + b) ip link add dev bareudp0 type bareudp dstport 6635 ethertype mpls + +3) Device Usage The bareudp device could be used along with OVS or flower filter in TC. The OVS or TC flower layer must set the tunnel information in SKB dst field before diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c index 99c0b5a..5ec170c 100644 --- a/drivers/net/bareudp.c +++ b/drivers/net/bareudp.c @@ -45,6 +45,7 @@ struct bareudp_dev { __be16 ethertype; __be16 port; u16 sport_min; + bool multi_proto_mode; struct socket __rcu *sock; struct list_head next; /* bareudp node on namespace list */ struct gro_cells gro_cells; @@ -70,7 +71,52 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb) else family = AF_INET6; - proto = bareudp->ethertype; + if (bareudp->ethertype == htons(ETH_P_IP)) { + struct iphdr *iphdr; + + iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN); + if (iphdr->version == 4) { + proto = bareudp->ethertype; + } else if (bareudp->multi_proto_mode && (iphdr->version == 6)) { + proto = htons(ETH_P_IPV6); + } else { + bareudp->dev->stats.rx_dropped++; + goto drop; + } + } else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) { + struct iphdr *tunnel_hdr; + + tunnel_hdr = (struct iphdr *)skb_network_header(skb); + if (tunnel_hdr->version == 4) { + if (!ipv4_is_multicast(tunnel_hdr->daddr)) { + proto = bareudp->ethertype; + } else if (bareudp->multi_proto_mode && + ipv4_is_multicast(tunnel_hdr->daddr)) { + proto = htons(ETH_P_MPLS_MC); + } else { + bareudp->dev->stats.rx_dropped++; + goto drop; + } + } else { + int addr_type; + struct ipv6hdr *tunnel_hdr_v6; + + tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb); + addr_type = + ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr); + if (!(addr_type & IPV6_ADDR_MULTICAST)) { + proto = bareudp->ethertype; + } else if (bareudp->multi_proto_mode && + (addr_type & IPV6_ADDR_MULTICAST)) { + proto = htons(ETH_P_MPLS_MC); + } else { + bareudp->dev->stats.rx_dropped++; + goto drop; + } + } + } else { + proto = bareudp->ethertype; + } if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN, proto, @@ -368,8 +414,12 @@ static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev) int err; if (skb->protocol != bareudp->ethertype) { - err = -EINVAL; - goto tx_error; + if (!bareudp->multi_proto_mode || + (skb->protocol != htons(ETH_P_MPLS_MC) && + skb->protocol != htons(ETH_P_IPV6))) { + err = -EINVAL; + goto tx_error; + } } info = skb_tunnel_info(skb); @@ -460,6 +510,7 @@ static int bareudp_fill_metadata_dst(struct net_device *dev, [IFLA_BAREUDP_PORT] = { .type = NLA_U16 }, [IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 }, [IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 }, + [IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG }, }; /* Info for udev, that this is a virtual tunnel endpoint */ @@ -542,9 +593,15 @@ static int bareudp_configure(struct net *net, struct net_device *dev, if (t) return -EBUSY; + if (conf->multi_proto_mode && + (conf->ethertype != htons(ETH_P_MPLS_UC) && + conf->ethertype != htons(ETH_P_IP))) + return -EINVAL; + bareudp->port = conf->port; bareudp->ethertype = conf->ethertype; bareudp->sport_min = conf->sport_min; + bareudp->multi_proto_mode = conf->multi_proto_mode; err = register_netdevice(dev); if (err) return err; @@ -601,6 +658,7 @@ static size_t bareudp_get_size(const struct net_device *dev) return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */ nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */ nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */ + nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */ 0; } @@ -614,6 +672,9 @@ static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev) goto nla_put_failure; if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min)) goto nla_put_failure; + if (bareudp->multi_proto_mode && + nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE)) + goto nla_put_failure; return 0; diff --git a/include/net/bareudp.h b/include/net/bareudp.h index 513fae6..cb03f6f 100644 --- a/include/net/bareudp.h +++ b/include/net/bareudp.h @@ -10,6 +10,7 @@ struct bareudp_conf { __be16 ethertype; __be16 port; u16 sport_min; + bool multi_proto_mode; }; struct net_device *bareudp_dev_create(struct net *net, const char *name, diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h index fb4b33a..61e0801 100644 --- a/include/uapi/linux/if_link.h +++ b/include/uapi/linux/if_link.h @@ -596,6 +596,7 @@ enum { IFLA_BAREUDP_PORT, IFLA_BAREUDP_ETHERTYPE, IFLA_BAREUDP_SRCPORT_MIN, + IFLA_BAREUDP_MULTIPROTO_MODE, __IFLA_BAREUDP_MAX };