Date: Fri, 15 Apr 2011 20:42:15 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org Subject: svn commit: r220678 - stable/7/sys/netinet Message-ID: <201104152042.p3FKgFJm081678@svn.freebsd.org>
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Author: jhb Date: Fri Apr 15 20:42:14 2011 New Revision: 220678 URL: http://svn.freebsd.org/changeset/base/220678 Log: MFC 220156: Clamp the initial advertised receive window when responding to a SYN/ACK to the maximum allowed window. Growing the window too large would cause an underflow in the calculations in tcp_output() to decide if a window update should be sent which would prevent the persist timer from being started if data was pending and the other end of the connection advertised an initial window size of 0. Modified: stable/7/sys/netinet/tcp_input.c Directory Properties: stable/7/sys/ (props changed) stable/7/sys/cddl/contrib/opensolaris/ (props changed) stable/7/sys/contrib/dev/acpica/ (props changed) stable/7/sys/contrib/pf/ (props changed) Modified: stable/7/sys/netinet/tcp_input.c ============================================================================== --- stable/7/sys/netinet/tcp_input.c Fri Apr 15 20:40:49 2011 (r220677) +++ stable/7/sys/netinet/tcp_input.c Fri Apr 15 20:42:14 2011 (r220678) @@ -1296,7 +1296,8 @@ tcp_do_segment(struct mbuf *m, struct tc (TF_RCVD_SCALE|TF_REQ_SCALE)) { tp->rcv_scale = tp->request_r_scale; } - tp->rcv_adv += tp->rcv_wnd; + tp->rcv_adv += imin(tp->rcv_wnd, + TCP_MAXWIN << tp->rcv_scale); tp->snd_una++; /* SYN is acked */ /* * If there's data, delay ACK; if there's also a FIN
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