Date: Tue, 4 Dec 2018 22:13:05 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r341500 - stable/12/sys/netinet/tcp_stacks Message-ID: <201812042213.wB4MD5LJ098438@repo.freebsd.org>
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Author: tuexen Date: Tue Dec 4 22:13:05 2018 New Revision: 341500 URL: https://svnweb.freebsd.org/changeset/base/341500 Log: MFC r340781: Ensure that the TCP RACK stack honours the setting of the net.inet.tcp.drop_synfin sysctl-variable. Reviewed by: rrs@ Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D18033 Modified: stable/12/sys/netinet/tcp_stacks/rack.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/tcp_stacks/rack.c ============================================================================== --- stable/12/sys/netinet/tcp_stacks/rack.c Tue Dec 4 22:11:41 2018 (r341499) +++ stable/12/sys/netinet/tcp_stacks/rack.c Tue Dec 4 22:13:05 2018 (r341500) @@ -6528,6 +6528,10 @@ rack_hpts_do_segment(struct mbuf *m, struct tcphdr *th TCP_LOG_EVENT(tp, th, &so->so_rcv, &so->so_snd, TCP_LOG_IN, 0, tlen, &log, true); } + if ((thflags & TH_SYN) && (thflags & TH_FIN) && V_drop_synfin) { + way_out = 4; + goto done_with_input; + } /* * Segment received on connection. Reset idle time and keep-alive * timer. XXX: This should be done after segment validation to
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