Date: Wed, 6 Jan 2010 16:51:57 +0000 (UTC) From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/netinet tcp_input.c tcp_subr.c tcp_var.h Message-ID: <201001061652.o06GqBes003521@repoman.freebsd.org>
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bz 2010-01-06 16:51:57 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_7)
sys/netinet tcp_input.c tcp_subr.c tcp_var.h
Log:
SVN rev 201655 on 2010-01-06 16:51:57Z by bz
MFC r184722:
Fix a bug introduced with r182851 (r201653 in stable/7) splitting
tcp_mss() into tcp_mss() and tcp_mss_update() so that tcp_mtudisc()
could re-use the same code.
Move the TSO logic back to tcp_mss() and out of tcp_mss_update().
We tried to avoid that initially but if were are called from
tcp_output() with EMSGSIZE, we cleared the TSO flag on the tcpcb
there, called into tcp_mtudisc() and tcp_mss_update() which
then would reenable TSO on the tcpcb based on TSO capabilities
of the interface as learnt in tcp_maxmtu/6().
So if TSO was enabled on the (possibly new) outgoing interface
it was turned back on, which lead to an endless loop between
tcp_output() and tcp_mtudisc() until we overflew the stack.
Reported by: kmacy
Revision Changes Path
1.370.2.17 +10 -9 src/sys/netinet/tcp_input.c
1.300.2.17 +1 -1 src/sys/netinet/tcp_subr.c
1.157.2.8 +1 -1 src/sys/netinet/tcp_var.h
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