From owner-svn-src-head@freebsd.org Thu Nov 22 20:05:58 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2D03B1106075; Thu, 22 Nov 2018 20:05:58 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A9CBC84B66; Thu, 22 Nov 2018 20:05:57 +0000 (UTC) (envelope-from tuexen@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 8508E14826; Thu, 22 Nov 2018 20:05:57 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wAMK5vTI089165; Thu, 22 Nov 2018 20:05:57 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wAMK5vGu089164; Thu, 22 Nov 2018 20:05:57 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <201811222005.wAMK5vGu089164@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Thu, 22 Nov 2018 20:05:57 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340782 - head/sys/netinet/tcp_stacks X-SVN-Group: head X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: head/sys/netinet/tcp_stacks X-SVN-Commit-Revision: 340782 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: A9CBC84B66 X-Spamd-Result: default: False [1.18 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_SPAM_LONG(0.40)[0.400,0]; NEURAL_SPAM_MEDIUM(0.72)[0.721,0]; NEURAL_SPAM_SHORT(0.06)[0.059,0] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Nov 2018 20:05:58 -0000 Author: tuexen Date: Thu Nov 22 20:05:57 2018 New Revision: 340782 URL: https://svnweb.freebsd.org/changeset/base/340782 Log: A TCP stack is required to check SEG.ACK first, when processing a segment in the SYN-SENT state as stated in Section 3.9 of RFC 793, page 66. Ensure this is also done by the TCP RACK stack. Reviewed by: rrs@ MFC after: 1 week Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D18034 Modified: head/sys/netinet/tcp_stacks/rack.c Modified: head/sys/netinet/tcp_stacks/rack.c ============================================================================== --- head/sys/netinet/tcp_stacks/rack.c Thu Nov 22 20:02:39 2018 (r340781) +++ head/sys/netinet/tcp_stacks/rack.c Thu Nov 22 20:05:57 2018 (r340782) @@ -6533,6 +6533,15 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th goto done_with_input; } /* + * If a segment with the ACK-bit set arrives in the SYN-SENT state + * check SEQ.ACK first as described on page 66 of RFC 793, section 3.9. + */ + if ((tp->t_state == TCPS_SYN_SENT) && (thflags & TH_ACK) && + (SEQ_LEQ(th->th_ack, tp->iss) || SEQ_GT(th->th_ack, tp->snd_max))) { + rack_do_dropwithreset(m, tp, th, BANDLIM_RST_OPENPORT, tlen); + return; + } + /* * Segment received on connection. Reset idle time and keep-alive * timer. XXX: This should be done after segment validation to * ignore broken/spoofed segs.