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From: Kristof Provost <kp@FreeBSD.org>
Date: Sat, 14 Jul 2018 10:14:59 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r336275 - head/sys/netpfil/pf
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Author: kp
Date: Sat Jul 14 10:14:59 2018
New Revision: 336275
URL: https://svnweb.freebsd.org/changeset/base/336275

Log:
  pf: Fix synproxy
  
  Synproxy was accidentally broken by r335569. The 'return (action)' must be
  executed for every non-PF_PASS result, but the error packet (TCP RST or ICMP
  error) should only be sent if the packet was dropped (i.e. PF_DROP) and the
  return flag is set.
  
  PR:		229477
  Submitted by:	Andre Albsmeier <mail AT fbsd.e4m.org>
  MFC after:	1 week

Modified:
  head/sys/netpfil/pf/pf.c

Modified: head/sys/netpfil/pf/pf.c
==============================================================================
--- head/sys/netpfil/pf/pf.c	Sat Jul 14 09:29:45 2018	(r336274)
+++ head/sys/netpfil/pf/pf.c	Sat Jul 14 10:14:59 2018	(r336275)
@@ -3558,9 +3558,11 @@ pf_test_rule(struct pf_rule **rm, struct pf_state **sm
 		action = pf_create_state(r, nr, a, pd, nsn, nk, sk, m, off,
 		    sport, dport, &rewrite, kif, sm, tag, bproto_sum, bip_sum,
 		    hdrlen);
-		if (action != PF_PASS && r->rule_flag & PFRULE_RETURN) {
-			pf_return(r, nr, pd, sk, off, m, th, kif,
-			    bproto_sum, bip_sum, hdrlen, &reason);
+		if (action != PF_PASS) {
+			if (action == PF_DROP &&
+			    (r->rule_flag & PFRULE_RETURN))
+				pf_return(r, nr, pd, sk, off, m, th, kif,
+				    bproto_sum, bip_sum, hdrlen, &reason);
 			return (action);
 		}
 	} else {