From owner-svn-src-stable@freebsd.org Sat Sep 7 11:31:06 2019 Return-Path: Delivered-To: svn-src-stable@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 A5722EE468; Sat, 7 Sep 2019 11:31:06 +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 46QXLL3xCLz4R6N; Sat, 7 Sep 2019 11:31:06 +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 6B2504D97; Sat, 7 Sep 2019 11:31:06 +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 x87BV6fR038293; Sat, 7 Sep 2019 11:31:06 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x87BV55O038290; Sat, 7 Sep 2019 11:31:05 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <201909071131.x87BV55O038290@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Sat, 7 Sep 2019 11:31:05 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r351993 - in stable/12: share/man/man4 sys/netinet X-SVN-Group: stable-12 X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: in stable/12: share/man/man4 sys/netinet X-SVN-Commit-Revision: 351993 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 07 Sep 2019 11:31:06 -0000 Author: tuexen Date: Sat Sep 7 11:31:05 2019 New Revision: 351993 URL: https://svnweb.freebsd.org/changeset/base/351993 Log: MFC r350265: Add a sysctl variable ts_offset_per_conn to change the computation of the TCP TS offset from taking the IP addresses and the TCP port numbers into account to a version just taking only the IP addresses into account. This works around broken middleboxes or endpoints. The default is to keep the behaviour, which is also the behaviour recommended in RFC 7323. Reported by: devgs@ukr.net Reviewed by: rrs@ Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D20980 Modified: stable/12/share/man/man4/tcp.4 stable/12/sys/netinet/tcp_subr.c stable/12/sys/netinet/tcp_var.h Directory Properties: stable/12/ (props changed) Modified: stable/12/share/man/man4/tcp.4 ============================================================================== --- stable/12/share/man/man4/tcp.4 Sat Sep 7 11:24:29 2019 (r351992) +++ stable/12/share/man/man4/tcp.4 Sat Sep 7 11:31:05 2019 (r351993) @@ -34,7 +34,7 @@ .\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93 .\" $FreeBSD$ .\" -.Dd March 23, 2019 +.Dd July 23, 2019 .Dt TCP 4 .Os .Sh NAME @@ -607,6 +607,10 @@ Default is false. .It Va insecure_syn Use criteria defined in RFC793 instead of RFC5961 for accepting SYN segments. Default is false. +.It Va ts_offset_per_conn +When initializing the TCP timestamps, use a per connection offset instead of a +per host pair offset. +Default is to use per connection offsets as recommended in RFC 7323. .El .Sh ERRORS A socket operation may fail with one of the following errors returned: Modified: stable/12/sys/netinet/tcp_subr.c ============================================================================== --- stable/12/sys/netinet/tcp_subr.c Sat Sep 7 11:24:29 2019 (r351992) +++ stable/12/sys/netinet/tcp_subr.c Sat Sep 7 11:31:05 2019 (r351993) @@ -195,6 +195,11 @@ SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, &VNET_NAME(tcp_do_rfc1323), 0, "Enable rfc1323 (high performance TCP) extensions"); +VNET_DEFINE(int, tcp_ts_offset_per_conn) = 1; +SYSCTL_INT(_net_inet_tcp, OID_AUTO, ts_offset_per_conn, CTLFLAG_VNET | CTLFLAG_RW, + &VNET_NAME(tcp_ts_offset_per_conn), 0, + "Initialize TCP timestamps per connection instead of per host pair"); + static int tcp_log_debug = 0; SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_debug, CTLFLAG_RW, &tcp_log_debug, 0, "Log errors caused by incoming TCP segments"); @@ -2649,7 +2654,17 @@ tcp_keyed_hash(struct in_conninfo *inc, u_char *key, u uint32_t tcp_new_ts_offset(struct in_conninfo *inc) { - return (tcp_keyed_hash(inc, V_ts_offset_secret, + struct in_conninfo inc_store, *local_inc; + + if (!V_tcp_ts_offset_per_conn) { + memcpy(&inc_store, inc, sizeof(struct in_conninfo)); + inc_store.inc_lport = 0; + inc_store.inc_fport = 0; + local_inc = &inc_store; + } else { + local_inc = inc; + } + return (tcp_keyed_hash(local_inc, V_ts_offset_secret, sizeof(V_ts_offset_secret))); } Modified: stable/12/sys/netinet/tcp_var.h ============================================================================== --- stable/12/sys/netinet/tcp_var.h Sat Sep 7 11:24:29 2019 (r351992) +++ stable/12/sys/netinet/tcp_var.h Sat Sep 7 11:31:05 2019 (r351993) @@ -798,6 +798,7 @@ VNET_DECLARE(struct inpcbinfo, tcbinfo); #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) #define V_tcp_do_ecn VNET(tcp_do_ecn) #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) +#define V_tcp_ts_offset_per_conn VNET(tcp_ts_offset_per_conn) #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)