Insert an empty place-holder for the PROXY protocol.

bin/varnishd/Makefile.am

@@ -78,6 +78,7 @@ varnishd_SOURCES = \
 	mgt/mgt_shmem.c \
 	mgt/mgt_vcc.c \
 	mgt/mgt_vcl.c \
+	proxy/cache_proxy_proto.c \
 	storage/stevedore.c \
 	storage/stevedore_mgt.c \
 	storage/stevedore_utils.c \

bin/varnishd/cache/cache.h

@@ -977,6 +977,9 @@ unsigned V1L_Flush(const struct worker *w);
 unsigned V1L_FlushRelease(struct worker *w);
 size_t V1L_Write(const struct worker *w, const void *ptr, ssize_t len);
 
+/* cache_proxy.c [VPX] */
+task_func_t VPX_Proto_Sess;
+
 /* cache_range.c [VRG] */
 void VRG_dorange(struct req *req, struct busyobj *bo, const char *r);
 
@@ -990,7 +993,7 @@ void SES_DeletePool(struct sesspool *sp);
 int SES_Reschedule_Req(struct req *);
 struct req *SES_GetReq(const struct worker *, struct sess *);
 void SES_ReleaseReq(struct req *);
-void SES_Proto_Sess(struct worker *wrk, void *arg);
+task_func_t SES_Proto_Sess;
 
 #define SESS_ATTR(UP, low, typ, len)				\
 	int SES_Get_##low(const struct sess *sp, typ *dst);	\

bin/varnishd/cache/cache_session.c

@@ -240,6 +240,9 @@ SES_Proto_Sess(struct worker *wrk, void *arg)
 		sp->sess_step = S_STP_H1NEWREQ;
 		wrk->task.func = ses_proto_req;
 		wrk->task.priv = req;
+	} else if (sp->sess_step < S_STP_PROXY_LAST) {
+		wrk->task.func = VPX_Proto_Sess;
+		wrk->task.priv = sp;
 	} else {
 		WRONG("Wrong session step");
 	}

bin/varnishd/flint.sh

@@ -20,11 +20,12 @@ flexelint \
 	-DVARNISH_VCL_DIR=\"foo\" \
 	cache/*.c \
 	common/*.c \
-	storage/*.c \
-	waiter/*.c \
 	hash/*.c \
 	http1/*.c \
 	mgt/*.c \
+	proxy/*.c \
+	storage/*.c \
+	waiter/*.c \
 	../../lib/libvarnish/*.c \
 	../../lib/libvarnishcompat/execinfo.c \
 	../../lib/libvcc/*.c \

bin/varnishd/mgt/mgt_acceptor.c

@@ -183,6 +183,9 @@ MAC_Arg(const char *arg)
 	if (av[2] == NULL || !strcmp(av[2], "HTTP/1")) {
 		mh->first_step = S_STP_H1NEWSESS;
 		mh->proto_name = "HTTP/1";
+	} else if (!strcmp(av[2], "PROXY")) {
+		mh->first_step = S_STP_PROXYNEWSESS;
+		mh->proto_name = "PROXY";
 	} else {
 		ARGV_ERR("Unknown protocol '%s'\n", av[2]);
 	}

bin/varnishd/proxy/cache_proxy_proto.c

+/*-
+ * Copyright (c) 2015 Varnish Software AS
+ * All rights reserved.
+ *
+ * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include "config.h"
+
+#include "../cache/cache.h"
+
+void __match_proto__(task_func_t)
+VPX_Proto_Sess(struct worker *wrk, void *priv)
+{
+
+	(void)wrk;
+	(void)priv;
+	INCOMPL();
+}

include/tbl/steps.h

@@ -35,6 +35,9 @@ SESS_STEP(h1newsess,	H1NEWSESS)
 SESS_STEP(h1newreq,	H1NEWREQ)
 SESS_STEP(h1working,	H1WORKING)
 SESS_STEP(h1_last,	H1_LAST)
+
+SESS_STEP(proxynewsess,	PROXYNEWSESS)
+SESS_STEP(proxy_last,	PROXY_LAST)
 #endif
 
 #ifdef REQ_STEP