From owner-svn-src-all@freebsd.org Thu May 21 21:15:26 2020 Return-Path: Delivered-To: svn-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 054A72F5A94; Thu, 21 May 2020 21:15:26 +0000 (UTC) (envelope-from rscheff@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 49Sj7x6Jghz4MBF; Thu, 21 May 2020 21:15:25 +0000 (UTC) (envelope-from rscheff@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id D3B5613F81; Thu, 21 May 2020 21:15:25 +0000 (UTC) (envelope-from rscheff@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 04LLFPl8085738; Thu, 21 May 2020 21:15:25 GMT (envelope-from rscheff@FreeBSD.org) Received: (from rscheff@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 04LLFPA6085735; Thu, 21 May 2020 21:15:25 GMT (envelope-from rscheff@FreeBSD.org) Message-Id: <202005212115.04LLFPA6085735@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: rscheff set sender to rscheff@FreeBSD.org using -f From: Richard Scheffenegger Date: Thu, 21 May 2020 21:15:25 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r361345 - in head/sys/netinet: . tcp_stacks X-SVN-Group: head X-SVN-Commit-Author: rscheff X-SVN-Commit-Paths: in head/sys/netinet: . tcp_stacks X-SVN-Commit-Revision: 361345 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 21:15:26 -0000 Author: rscheff Date: Thu May 21 21:15:25 2020 New Revision: 361345 URL: https://svnweb.freebsd.org/changeset/base/361345 Log: Handle ECN handshake in simultaneous open While testing simultaneous open TCP with ECN, found that negotiation fails to arrive at the expected final state. Reviewed by: tuexen (mentor) Approved by: tuexen (mentor), rgrimes (mentor) MFC after: 2 weeks Sponsored by: NetApp, Inc. Differential Revision: https://reviews.freebsd.org/D23373 Modified: head/sys/netinet/tcp_input.c head/sys/netinet/tcp_output.c head/sys/netinet/tcp_stacks/rack.c Modified: head/sys/netinet/tcp_input.c ============================================================================== --- head/sys/netinet/tcp_input.c Thu May 21 21:00:46 2020 (r361344) +++ head/sys/netinet/tcp_input.c Thu May 21 21:15:25 2020 (r361345) @@ -1611,6 +1611,14 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, stru * XXX this is traditional behavior, may need to be cleaned up. */ if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) { + /* Handle parallel SYN for ECN */ + if (!(thflags & TH_ACK) && + ((thflags & (TH_CWR | TH_ECE)) == (TH_CWR | TH_ECE)) && + ((V_tcp_do_ecn == 1) || (V_tcp_do_ecn == 2))) { + tp->t_flags2 |= TF2_ECN_PERMIT; + tp->t_flags2 |= TF2_ECN_SND_ECE; + TCPSTAT_INC(tcps_ecn_shs); + } if ((to.to_flags & TOF_SCALE) && (tp->t_flags & TF_REQ_SCALE)) { tp->t_flags |= TF_RCVD_SCALE; Modified: head/sys/netinet/tcp_output.c ============================================================================== --- head/sys/netinet/tcp_output.c Thu May 21 21:00:46 2020 (r361344) +++ head/sys/netinet/tcp_output.c Thu May 21 21:15:25 2020 (r361345) @@ -1154,6 +1154,12 @@ send: } else flags |= TH_ECE|TH_CWR; } + /* Handle parallel SYN for ECN */ + if ((tp->t_state == TCPS_SYN_RECEIVED) && + (tp->t_flags2 & TF2_ECN_SND_ECE)) { + flags |= TH_ECE; + tp->t_flags2 &= ~TF2_ECN_SND_ECE; + } if (tp->t_state == TCPS_ESTABLISHED && (tp->t_flags2 & TF2_ECN_PERMIT)) { Modified: head/sys/netinet/tcp_stacks/rack.c ============================================================================== --- head/sys/netinet/tcp_stacks/rack.c Thu May 21 21:00:46 2020 (r361344) +++ head/sys/netinet/tcp_stacks/rack.c Thu May 21 21:15:25 2020 (r361345) @@ -11070,6 +11070,14 @@ rack_do_segment_nounlock(struct mbuf *m, struct tcphdr * this is traditional behavior, may need to be cleaned up. */ if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) { + /* Handle parallel SYN for ECN */ + if (!(thflags & TH_ACK) && + ((thflags & (TH_CWR | TH_ECE)) == (TH_CWR | TH_ECE)) && + ((V_tcp_do_ecn == 1) || (V_tcp_do_ecn == 2))) { + tp->t_flags2 |= TF2_ECN_PERMIT; + tp->t_flags2 |= TF2_ECN_SND_ECE; + TCPSTAT_INC(tcps_ecn_shs); + } if ((to.to_flags & TOF_SCALE) && (tp->t_flags & TF_REQ_SCALE)) { tp->t_flags |= TF_RCVD_SCALE; @@ -13522,6 +13530,12 @@ send: flags |= TH_ECE | TH_CWR; } else flags |= TH_ECE | TH_CWR; + } + /* Handle parallel SYN for ECN */ + if ((tp->t_state == TCPS_SYN_RECEIVED) && + (tp->t_flags2 & TF2_ECN_SND_ECE)) { + flags |= TH_ECE; + tp->t_flags2 &= ~TF2_ECN_SND_ECE; } if (tp->t_state == TCPS_ESTABLISHED && (tp->t_flags2 & TF2_ECN_PERMIT)) {