From owner-svn-src-all@freebsd.org Mon Sep 9 16:07:48 2019 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 3394FD691F; Mon, 9 Sep 2019 16:07:48 +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 TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) 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 46RtNh0YM9z497H; Mon, 9 Sep 2019 16:07:48 +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 E9FAB181AD; Mon, 9 Sep 2019 16:07:47 +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 x89G7lg2028619; Mon, 9 Sep 2019 16:07:47 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x89G7l2x028617; Mon, 9 Sep 2019 16:07:47 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <201909091607.x89G7l2x028617@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Mon, 9 Sep 2019 16:07:47 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r352072 - in head/sys/netinet: . tcp_stacks X-SVN-Group: head X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: in head/sys/netinet: . tcp_stacks X-SVN-Commit-Revision: 352072 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: 2.1.29 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: Mon, 09 Sep 2019 16:07:48 -0000 Author: tuexen Date: Mon Sep 9 16:07:47 2019 New Revision: 352072 URL: https://svnweb.freebsd.org/changeset/base/352072 Log: Only update SACK/DSACK lists when a non-empty segment was received. This fixes hitting a KASSERT with a valid packet exchange. Reviewed by: rrs@, Richard Scheffenegger MFC after: 3 days Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D21567 Modified: head/sys/netinet/tcp_input.c head/sys/netinet/tcp_stacks/rack.c Modified: head/sys/netinet/tcp_input.c ============================================================================== --- head/sys/netinet/tcp_input.c Mon Sep 9 15:57:24 2019 (r352071) +++ head/sys/netinet/tcp_input.c Mon Sep 9 16:07:47 2019 (r352072) @@ -3045,9 +3045,8 @@ dodata: /* XXX */ thflags = tcp_reass(tp, th, &temp, &tlen, m); tp->t_flags |= TF_ACKNOW; } - if (tp->t_flags & TF_SACK_PERMIT) { - if (((tlen == 0) && (save_tlen > 0) && - (SEQ_LT(save_start, save_rnxt)))) { + if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) { + if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { /* * DSACK actually handled in the fastpath * above. @@ -3055,20 +3054,20 @@ dodata: /* XXX */ tcp_update_sack_list(tp, save_start, save_start + save_tlen); } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { - /* - * Cleaning sackblks by using zero length - * update. - */ if ((tp->rcv_numsacks >= 1) && (tp->sackblks[0].end == save_start)) { - /* partial overlap, recorded at todrop above */ - tcp_update_sack_list(tp, tp->sackblks[0].start, + /* + * Partial overlap, recorded at todrop + * above. + */ + tcp_update_sack_list(tp, + tp->sackblks[0].start, tp->sackblks[0].end); } else { tcp_update_dsack_list(tp, save_start, save_start + save_tlen); } - } else if ((tlen > 0) && (tlen >= save_tlen)) { + } else if (tlen >= save_tlen) { /* Update of sackblks. */ tcp_update_dsack_list(tp, save_start, save_start + save_tlen); Modified: head/sys/netinet/tcp_stacks/rack.c ============================================================================== --- head/sys/netinet/tcp_stacks/rack.c Mon Sep 9 15:57:24 2019 (r352071) +++ head/sys/netinet/tcp_stacks/rack.c Mon Sep 9 16:07:47 2019 (r352072) @@ -4942,35 +4942,36 @@ dodata: /* XXX */ thflags = tcp_reass(tp, th, &temp, &tlen, m); tp->t_flags |= TF_ACKNOW; } - if (((tlen == 0) && (save_tlen > 0) && - (SEQ_LT(save_start, save_rnxt)))) { - /* - * DSACK actually handled in the fastpath - * above. - */ - tcp_update_sack_list(tp, save_start, - save_start + save_tlen); - } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { - /* - * Cleaning sackblks by using zero length - * update. - */ - if ((tp->rcv_numsacks >= 1) && - (tp->sackblks[0].end == save_start)) { - /* partial overlap, recorded at todrop above */ - tcp_update_sack_list(tp, tp->sackblks[0].start, - tp->sackblks[0].end); - } else { + if ((tp->t_flags & TF_SACK_PERMIT) && (save_tlen > 0)) { + if ((tlen == 0) && (SEQ_LT(save_start, save_rnxt))) { + /* + * DSACK actually handled in the fastpath + * above. + */ + tcp_update_sack_list(tp, save_start, + save_start + save_tlen); + } else if ((tlen > 0) && SEQ_GT(tp->rcv_nxt, save_rnxt)) { + if ((tp->rcv_numsacks >= 1) && + (tp->sackblks[0].end == save_start)) { + /* + * Partial overlap, recorded at todrop + * above. + */ + tcp_update_sack_list(tp, + tp->sackblks[0].start, + tp->sackblks[0].end); + } else { + tcp_update_dsack_list(tp, save_start, + save_start + save_tlen); + } + } else if (tlen >= save_tlen) { + /* Update of sackblks. */ tcp_update_dsack_list(tp, save_start, save_start + save_tlen); + } else if (tlen > 0) { + tcp_update_dsack_list(tp, save_start, + save_start + tlen); } - } else if ((tlen > 0) && (tlen >= save_tlen)) { - /* Update of sackblks. */ - tcp_update_dsack_list(tp, save_start, - save_start + save_tlen); - } else if (tlen > 0) { - tcp_update_dsack_list(tp, save_start, - save_start + tlen); } } else { m_freem(m);