From patchwork Thu Oct 8 09:47:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xin Long X-Patchwork-Id: 268446 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=-6.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=no 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 CA81BC433E7 for ; Thu, 8 Oct 2020 09:48:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 697312177B for ; Thu, 8 Oct 2020 09:48:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fPjd5S4W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729227AbgJHJsX (ORCPT ); Thu, 8 Oct 2020 05:48:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725849AbgJHJsW (ORCPT ); Thu, 8 Oct 2020 05:48:22 -0400 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9DE29C061755; Thu, 8 Oct 2020 02:48:22 -0700 (PDT) Received: by mail-pg1-x544.google.com with SMTP id h6so3835912pgk.4; Thu, 08 Oct 2020 02:48:22 -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; bh=ZEpfchtPlSN6NaVHvp0J/53pPQ0OVmTy9xX4+EJUKNw=; b=fPjd5S4WWhVW89Mtfqs1QjrCL/kXd0fKNXZ1eRFm+xBSOnSEEwxS0Oy5WlSDhp76bH LVfK5CizUWFTie8TSKdluLiDnsmq/8BFjQBAzSR+Bj+jfrKjVWMKIiHguypiSTZm8Uax Vy0419viQKehfTizIOANr7fRYQfCr7pqtwclXanA6CpW3lZwAYwtvC6/KjBYsOftzH6B fgNvTXboHcp9Z8vwhh6afC07GtP+/4LGCbfIYozSvRDj4wZFv6UdqJz73NiW93Ugnam8 WfSZIZS0HCY5+FI2vYw1I8vO779Kr3XX5FDTRg8sF1bW8lHDPMjr7aSZHuc0WrxJenpD iwQQ== 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; bh=ZEpfchtPlSN6NaVHvp0J/53pPQ0OVmTy9xX4+EJUKNw=; b=NFlUff4b2KA/573wtrE8SiCVnAx1ldsT/FiutUpk7MJ0Zm9MgLW9ra5wyBauKoxMBD 95X7C8yieZSDvZq0uso5z61OAkKQ0QsF2SvWDUgqyFsKVnAXSIGPEZxf//GYw9F6Uw93 C8d/tUhnLZIXsr/mfDW5OtkibK17ktAsZzYhapr3zUXlPOQC2LWBGvrV1m/yyyDvMMNo nVMveOoSOevOcHRq6vD1dd9RBUkRjq3QyMkPI91lF1z+VugElJxcytE2akz2XGM1OqPl yiHshu3ch8IfFM51BALjQg/b+tKZIySGQz9G/QjYw6quGeHU7mhIrOM8QRuO8SOqNLDJ w+9g== X-Gm-Message-State: AOAM531tIIH2ksxxEvmqB3jDam4/sy7inJ4QtisnHCaLeeOwGwaiDCX0 ySfV/R32EMp31qPoVJ470Pm9ocWZdrg= X-Google-Smtp-Source: ABdhPJy+OpasCQZdBOEAM5N8VMaT3gCDh1YhXgPHLZmit4wUE18iez6W45eddUuHw+Un7K9tscB3TA== X-Received: by 2002:a17:90a:ff06:: with SMTP id ce6mr7074588pjb.38.1602150501732; Thu, 08 Oct 2020 02:48:21 -0700 (PDT) Received: from localhost ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id c7sm6646476pfj.84.2020.10.08.02.48.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 08 Oct 2020 02:48:21 -0700 (PDT) From: Xin Long To: network dev , linux-sctp@vger.kernel.org Cc: Marcelo Ricardo Leitner , Neil Horman , Michael Tuexen , davem@davemloft.net Subject: [PATCHv2 net-next 00/17] sctp: Implement RFC6951: UDP Encapsulation of SCTP Date: Thu, 8 Oct 2020 17:47:56 +0800 Message-Id: X-Mailer: git-send-email 2.1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Description From the RFC: The Main Reasons: o To allow SCTP traffic to pass through legacy NATs, which do not provide native SCTP support as specified in [BEHAVE] and [NATSUPP]. o To allow SCTP to be implemented on hosts that do not provide direct access to the IP layer. In particular, applications can use their own SCTP implementation if the operating system does not provide one. Implementation Notes: UDP-encapsulated SCTP is normally communicated between SCTP stacks using the IANA-assigned UDP port number 9899 (sctp-tunneling) on both ends. There are circumstances where other ports may be used on either end, and it might be required to use ports other than the registered port. Each SCTP stack uses a single local UDP encapsulation port number as the destination port for all its incoming SCTP packets, this greatly simplifies implementation design. An SCTP implementation supporting UDP encapsulation MUST maintain a remote UDP encapsulation port number per destination address for each SCTP association. Again, because the remote stack may be using ports other than the well-known port, each port may be different from each stack. However, because of remapping of ports by NATs, the remote ports associated with different remote IP addresses may not be identical, even if they are associated with the same stack. Because the well-known port might not be used, implementations need to allow other port numbers to be specified as a local or remote UDP encapsulation port number through APIs. Patches: This patchset is using the udp4/6 tunnel APIs to implement the UDP Encapsulation of SCTP with not much change in SCTP protocol stack and with all current SCTP features keeped in Linux Kernel. 1 - 4: Fix some UDP issues that may be triggered by SCTP over UDP. 5 - 7: Process incoming UDP encapsulated packets and ICMP packets. 8 -10: Remote encap port's update by sysctl, sockopt and packets. 11-14: Process outgoing pakects with UDP encapsulated and its GSO. 15-16: Add the part from draft-tuexen-tsvwg-sctp-udp-encaps-cons-03. 17: Enable this feature. Tests: - lksctp-tools/src/func_tests with UDP Encapsulation enabled/disabled: Both make v4test and v6test passed. - sctp-tests with UDP Encapsulation enabled/disabled: repeatability/procdumps/sctpdiag/gsomtuchange/extoverflow/ sctphashtable passed. Others failed as expected due to those "iptables -p sctp" rules. - netperf on lo/netns/virtio_net, with gso enabled/disabled and with ip_checksum enabled/disabled, with UDP Encapsulation enabled/disabled: No clear performance dropped. v1->v2: - Fix some incorrect code in the patches 5,6,8,10,11,13,14,17, suggested by Marcelo. - Append two patches 15-16 to add the Additional Considerations for UDP Encapsulation of SCTP from draft-tuexen-tsvwg-sctp-udp-encaps-cons-03, noticed by Michael. Xin Long (17): udp: check udp sock encap_type in __udp_lib_err udp6: move the mss check after udp gso tunnel processing udp: do checksum properly in skb_udp_tunnel_segment udp: support sctp over udp in skb_udp_tunnel_segment sctp: create udp4 sock and add its encap_rcv sctp: create udp6 sock and set its encap_rcv sctp: add encap_err_lookup for udp encap socks sctp: add encap_port for netns sock asoc and transport sctp: add SCTP_REMOTE_UDP_ENCAPS_PORT sockopt sctp: allow changing transport encap_port by peer packets sctp: add udphdr to overhead when udp_port is set sctp: call sk_setup_caps in sctp_packet_transmit instead sctp: support for sending packet over udp4 sock sctp: support for sending packet over udp6 sock sctp: add the error cause for new encapsulation port restart sctp: handle the init chunk matching an existing asoc sctp: enable udp tunneling socks include/linux/sctp.h | 20 ++++++ include/net/netns/sctp.h | 8 +++ include/net/sctp/constants.h | 2 + include/net/sctp/sctp.h | 9 ++- include/net/sctp/sm.h | 4 ++ include/net/sctp/structs.h | 14 ++-- include/uapi/linux/sctp.h | 7 ++ net/ipv4/udp.c | 2 +- net/ipv4/udp_offload.c | 16 +++-- net/ipv6/udp.c | 2 +- net/ipv6/udp_offload.c | 154 +++++++++++++++++++++---------------------- net/sctp/associola.c | 4 ++ net/sctp/ipv6.c | 44 +++++++++---- net/sctp/output.c | 22 +++---- net/sctp/protocol.c | 148 +++++++++++++++++++++++++++++++++++++---- net/sctp/sm_make_chunk.c | 21 ++++++ net/sctp/sm_statefuns.c | 52 +++++++++++++++ net/sctp/socket.c | 112 +++++++++++++++++++++++++++++++ net/sctp/sysctl.c | 59 +++++++++++++++++ 19 files changed, 572 insertions(+), 128 deletions(-)