From patchwork Thu Oct 8 09:48:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xin Long X-Patchwork-Id: 11822561 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=-12.8 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,USER_AGENT_GIT autolearn=ham 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 858D4C43467 for ; Thu, 8 Oct 2020 09:50:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B3072177B for ; Thu, 8 Oct 2020 09:50:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="i43D+nwO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729324AbgJHJuH (ORCPT ); Thu, 8 Oct 2020 05:50:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725887AbgJHJuH (ORCPT ); Thu, 8 Oct 2020 05:50:07 -0400 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F2ADC061755; Thu, 8 Oct 2020 02:50:07 -0700 (PDT) Received: by mail-pf1-x42f.google.com with SMTP id n14so3547882pff.6; Thu, 08 Oct 2020 02:50:07 -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 :in-reply-to:references; bh=vxgUs2t02Y6T7ju2jCDcB1sbv2HoOE9Ilv7QfTc5UB0=; b=i43D+nwOf4/E9Duyi3d1RQD5bnl09MZTf+ueueKzb7ZQHZzAAoRnth3VVObwikZwmY j92/yX9iwCrBmEnbcvJsXlRAWGqn38+bm73JksifpMIjwvjuQk8/ZvBS6j5yp/MFq3lb LQQv5I6sAODpRJIKoWC2uKIfL77d0Qg1bciU3OTNeuFsRqMMQvJHBDB9j4ocvlBoRBT0 Dkr71ce5c64yRlBuoxmpWUoi8AMOnjzjs4zWkozr3gcmQ6+0yPrUbbkccXhDv1GnYS5m ccOe/TmuRhADaI90cmj3sPBfqrSulhk3KTBDlU1fQ8EReO/MpzgEBtGyFC+PKDjrro+C JF2A== 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:in-reply-to:references; bh=vxgUs2t02Y6T7ju2jCDcB1sbv2HoOE9Ilv7QfTc5UB0=; b=X1wCo/n4gNnC8wl2jvhr2bih2opvz01ssV5y0M2CziPxIQWi4CFwwL2ZYKm1UBJJdt aUlmzb2lsgprBk5YDNaxNN33uk5W5X24reil1Lx4u2JH4dbFEvr9h26XvZgOKkcDOrzS YefzLuMVIbl8v+TfyBzYKmkO2zVYGWbYKv2X/uNyT+O8R4CwkerMsRTEeVQYwpIMoWgd J24QmzeuBI0QjZ0+AWuVxWqpgfX+IPJ2nhq7XvqKovn4po/mMw/5MRXJ3XNOr85shiwc 5Q5/23WGN+pLeRNedj7M9kxpcmDHQ8a1zDtv+jkp+ncuE/KQ/Sf3hVx3jvRajLRopphy UOpQ== X-Gm-Message-State: AOAM533UQ9/f/PaUA/lk/oolBpRtxkcPumUjveZAZ0aYIRBc9iqNNPm4 YwmskywcMTcSyie1CydAE6w/XO8eQ+E= X-Google-Smtp-Source: ABdhPJxnq9ITDMw0XHe8yjxtH1sTTB+hTXXek7+xUuf38AQJWNrdH207G2KIl7yBCejCmhJN4ZvytA== X-Received: by 2002:aa7:9dcd:0:b029:152:421f:23eb with SMTP id g13-20020aa79dcd0000b0290152421f23ebmr6599191pfq.58.1602150606340; Thu, 08 Oct 2020 02:50:06 -0700 (PDT) Received: from localhost ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id l13sm6543347pgq.33.2020.10.08.02.50.05 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 08 Oct 2020 02:50:05 -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 13/17] sctp: support for sending packet over udp4 sock Date: Thu, 8 Oct 2020 17:48:09 +0800 Message-Id: <1d1b2e92f958add640d5be1e6eaec1ac5e4581ce.1602150362.git.lucien.xin@gmail.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: References: <052acb63198c44df41c5db17f8397eeb7c8bacfe.1602150362.git.lucien.xin@gmail.com> <483d9eec159b22172fe04dacd58d7f88dfc2f301.1602150362.git.lucien.xin@gmail.com> <17cab00046ea7fe36c8383925a4fc3fbc028c511.1602150362.git.lucien.xin@gmail.com> <6f5a15bba0e2b5d3da6be90fd222c5ee41691d32.1602150362.git.lucien.xin@gmail.com> <92d28810a72dee9d0d49e7433b65027cb52de191.1602150362.git.lucien.xin@gmail.com> <1128490426bfb52572ba338e7a631658da49f34c.1602150362.git.lucien.xin@gmail.com> In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patch does what the rfc6951#section-5.3 says for ipv4: "Within the UDP header, the source port MUST be the local UDP encapsulation port number of the SCTP stack, and the destination port MUST be the remote UDP encapsulation port number maintained for the association and the destination address to which the packet is sent (see Section 5.1). Because the SCTP packet is the UDP payload, the length of the UDP packet MUST be the length of the SCTP packet plus the size of the UDP header. The SCTP checksum MUST be computed for IPv4 and IPv6, and the UDP checksum SHOULD be computed for IPv4 and IPv6." Some places need to be adjusted in sctp_packet_transmit(): 1. For non-gso packets, when transport's encap_port is set, sctp checksum has to be done in sctp_packet_pack(), as the outer udp will use ip_summed = CHECKSUM_PARTIAL to do the offload setting for checksum. 2. Delay calling dst_clone() and skb_dst_set() for non-udp packets until sctp_v4_xmit(), as for udp packets, skb_dst_set() is not needed before calling udp_tunnel_xmit_skb(). then in sctp_v4_xmit(): 1. Go to udp_tunnel_xmit_skb() only when transport->encap_port and net->sctp.udp_port both are set, as these are one for dst port and another for src port. 2. For gso packet, SKB_GSO_UDP_TUNNEL_CSUM is set for gso_type, and with this udp checksum can be done in __skb_udp_tunnel_segment() for each segments after the sctp gso. 3. inner_mac_header and inner_transport_header are set, as these will be needed in __skb_udp_tunnel_segment() to find the right headers. 4. df and ttl are calculated, as these are the required params by udp_tunnel_xmit_skb(). 5. nocheck param has to be false, as "the UDP checksum SHOULD be computed for IPv4 and IPv6", says in rfc6951#section-5.3. v1->v2: - Use sp->udp_port instead in sctp_v4_xmit(), which is more safe. Signed-off-by: Xin Long --- net/sctp/output.c | 9 +++------ net/sctp/protocol.c | 41 ++++++++++++++++++++++++++++++----------- 2 files changed, 33 insertions(+), 17 deletions(-) diff --git a/net/sctp/output.c b/net/sctp/output.c index fb16500..6614c9f 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -514,8 +514,8 @@ static int sctp_packet_pack(struct sctp_packet *packet, if (sctp_checksum_disable) return 1; - if (!(skb_dst(head)->dev->features & NETIF_F_SCTP_CRC) || - dst_xfrm(skb_dst(head)) || packet->ipfragok) { + if (!(tp->dst->dev->features & NETIF_F_SCTP_CRC) || + dst_xfrm(tp->dst) || packet->ipfragok || tp->encap_port) { struct sctphdr *sh = (struct sctphdr *)skb_transport_header(head); @@ -542,7 +542,6 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp) struct sctp_association *asoc = tp->asoc; struct sctp_chunk *chunk, *tmp; int pkt_count, gso = 0; - struct dst_entry *dst; struct sk_buff *head; struct sctphdr *sh; struct sock *sk; @@ -579,13 +578,11 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp) sh->checksum = 0; /* drop packet if no dst */ - dst = dst_clone(tp->dst); - if (!dst) { + if (!tp->dst) { IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); kfree_skb(head); goto out; } - skb_dst_set(head, dst); rcu_read_lock(); if (__sk_dst_get(sk) != tp->dst) { diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index 0d16e5e..be002b7 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -1059,25 +1059,44 @@ static int sctp_inet_supported_addrs(const struct sctp_sock *opt, } /* Wrapper routine that calls the ip transmit routine. */ -static inline int sctp_v4_xmit(struct sk_buff *skb, - struct sctp_transport *transport) +static inline int sctp_v4_xmit(struct sk_buff *skb, struct sctp_transport *t) { - struct inet_sock *inet = inet_sk(skb->sk); + struct dst_entry *dst = dst_clone(t->dst); + struct flowi4 *fl4 = &t->fl.u.ip4; + struct sock *sk = skb->sk; + struct inet_sock *inet = inet_sk(sk); __u8 dscp = inet->tos; + __be16 df = 0; pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, - skb->len, &transport->fl.u.ip4.saddr, - &transport->fl.u.ip4.daddr); + skb->len, &fl4->saddr, &fl4->daddr); + + if (t->dscp & SCTP_DSCP_SET_MASK) + dscp = t->dscp & SCTP_DSCP_VAL_MASK; - if (transport->dscp & SCTP_DSCP_SET_MASK) - dscp = transport->dscp & SCTP_DSCP_VAL_MASK; + inet->pmtudisc = t->param_flags & SPP_PMTUD_ENABLE ? IP_PMTUDISC_DO + : IP_PMTUDISC_DONT; + SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); - inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? - IP_PMTUDISC_DO : IP_PMTUDISC_DONT; + if (!t->encap_port || !sctp_sk(sk)->udp_port) { + skb_dst_set(skb, dst); + return __ip_queue_xmit(sk, skb, &t->fl, dscp); + } + + if (skb_is_gso(skb)) + skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; - SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS); + if (ip_dont_fragment(sk, dst) && !skb->ignore_df) + df = htons(IP_DF); - return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp); + skb->encapsulation = 1; + skb_reset_inner_mac_header(skb); + skb_reset_inner_transport_header(skb); + skb_set_inner_ipproto(skb, IPPROTO_SCTP); + udp_tunnel_xmit_skb((struct rtable *)dst, sk, skb, fl4->saddr, + fl4->daddr, dscp, ip4_dst_hoplimit(dst), df, + sctp_sk(sk)->udp_port, t->encap_port, false, false); + return 0; } static struct sctp_af sctp_af_inet;