Date: Thu, 22 Nov 2018 20:02:39 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340781 - head/sys/netinet/tcp_stacks Message-ID: <201811222002.wAMK2dlM088967@repo.freebsd.org>
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Author: tuexen Date: Thu Nov 22 20:02:39 2018 New Revision: 340781 URL: https://svnweb.freebsd.org/changeset/base/340781 Log: Ensure that the TCP RACK stack honours the setting of the net.inet.tcp.drop_synfin sysctl-variable. Reviewed by: rrs@ MFC after: 1 week Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D18033 Modified: head/sys/netinet/tcp_stacks/rack.c Modified: head/sys/netinet/tcp_stacks/rack.c ============================================================================== --- head/sys/netinet/tcp_stacks/rack.c Thu Nov 22 20:00:56 2018 (r340780) +++ head/sys/netinet/tcp_stacks/rack.c Thu Nov 22 20:02:39 2018 (r340781) @@ -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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