From owner-svn-src-stable-7@FreeBSD.ORG Thu Jun 18 21:17:04 2009 Return-Path: Delivered-To: svn-src-stable-7@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E762E1065670; Thu, 18 Jun 2009 21:17:04 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id BA8E88FC08; Thu, 18 Jun 2009 21:17:04 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id n5ILH4ct022990; Thu, 18 Jun 2009 21:17:04 GMT (envelope-from jhb@svn.freebsd.org) Received: (from jhb@localhost) by svn.freebsd.org (8.14.3/8.14.3/Submit) id n5ILH4oD022986; Thu, 18 Jun 2009 21:17:04 GMT (envelope-from jhb@svn.freebsd.org) Message-Id: <200906182117.n5ILH4oD022986@svn.freebsd.org> From: John Baldwin Date: Thu, 18 Jun 2009 21:17:04 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org X-SVN-Group: stable-7 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r194462 - stable/7/sys/netinet X-BeenThere: svn-src-stable-7@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for only the 7-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Jun 2009 21:17:05 -0000 Author: jhb Date: Thu Jun 18 21:17:04 2009 New Revision: 194462 URL: http://svn.freebsd.org/changeset/base/194462 Log: MFC: Fix overflow edge cases with comparing ticks to t_rcvtime including fixing the TCP keepalive timer to work properly when ticks overflows from INT_MAX to INT_MIN. Note that to preserve the ABI this change just downcasts t_rcvtime to an int when it is subtracted from ticks rather than changing the type of t_rcvtime. Modified: stable/7/sys/netinet/tcp_output.c stable/7/sys/netinet/tcp_timer.c Modified: stable/7/sys/netinet/tcp_output.c ============================================================================== --- stable/7/sys/netinet/tcp_output.c Thu Jun 18 21:15:41 2009 (r194461) +++ stable/7/sys/netinet/tcp_output.c Thu Jun 18 21:17:04 2009 (r194462) @@ -161,7 +161,7 @@ tcp_output(struct tcpcb *tp) * to send, then transmit; otherwise, investigate further. */ idle = (tp->t_flags & TF_LASTIDLE) || (tp->snd_max == tp->snd_una); - if (idle && (ticks - tp->t_rcvtime) >= tp->t_rxtcur) { + if (idle && (ticks - (int)tp->t_rcvtime) >= tp->t_rxtcur) { /* * We have been idle for "a while" and no acks are * expected to clock out any data we send -- Modified: stable/7/sys/netinet/tcp_timer.c ============================================================================== --- stable/7/sys/netinet/tcp_timer.c Thu Jun 18 21:15:41 2009 (r194461) +++ stable/7/sys/netinet/tcp_timer.c Thu Jun 18 21:17:04 2009 (r194462) @@ -234,7 +234,7 @@ tcp_timer_2msl(void *xtp) tp = tcp_close(tp); } else { if (tp->t_state != TCPS_TIME_WAIT && - (ticks - tp->t_rcvtime) <= tcp_maxidle) + (ticks - (int)tp->t_rcvtime) <= tcp_maxidle) callout_reset(&tp->t_timers->tt_2msl, tcp_keepintvl, tcp_timer_2msl, tp); else @@ -293,7 +293,7 @@ tcp_timer_keep(void *xtp) goto dropit; if ((always_keepalive || inp->inp_socket->so_options & SO_KEEPALIVE) && tp->t_state <= TCPS_CLOSING) { - if ((ticks - tp->t_rcvtime) >= tcp_keepidle + tcp_maxidle) + if ((ticks - (int)tp->t_rcvtime) >= tcp_keepidle + tcp_maxidle) goto dropit; /* * Send a packet designed to force a response @@ -387,8 +387,8 @@ tcp_timer_persist(void *xtp) * backoff that we would use if retransmitting. */ if (tp->t_rxtshift == TCP_MAXRXTSHIFT && - ((ticks - tp->t_rcvtime) >= tcp_maxpersistidle || - (ticks - tp->t_rcvtime) >= TCP_REXMTVAL(tp) * tcp_totbackoff)) { + ((ticks - (int)tp->t_rcvtime) >= tcp_maxpersistidle || + (ticks - (int)tp->t_rcvtime) >= TCP_REXMTVAL(tp) * tcp_totbackoff)) { tcpstat.tcps_persistdrop++; tp = tcp_drop(tp, ETIMEDOUT); goto out;