[master] bba1499f5 Extend vrt_backend with a connection prefix ptr+len

[Poul-Henning Kamp]

commit bba1499f586dd7d75343d7869497d991ded2607e
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Tue Oct 8 08:04:26 2019 +0000

    Extend vrt_backend with a connection prefix ptr+len

diff --git a/bin/varnishd/cache/cache_backend.c b/bin/varnishd/cache/cache_backend.c
index 80134b35d..328e9078b 100644
--- a/bin/varnishd/cache/cache_backend.c
+++ b/bin/varnishd/cache/cache_backend.c
@@ -541,6 +541,8 @@ vrt_hash_be(const struct vrt_backend *vrt)
 		VSHA256_Update(cx, vrt->ipv6_suckaddr, vsa_suckaddr_len);
 	if (vrt->path != NULL)
 		VSHA256_Update(cx, vrt->path, strlen(vrt->path));
+	if (vrt->prefix_ptr != NULL)
+		VSHA256_Update(cx, vrt->prefix_ptr, vrt->prefix_len);
 	VSHA256_Final(ident, cx);
 	return (vbe64dec(ident));
 }
diff --git a/include/vrt.h b/include/vrt.h
index f5128fda2..556425298 100644
--- a/include/vrt.h
+++ b/include/vrt.h
@@ -52,7 +52,7 @@
  * binary/load-time compatible, increment MAJOR version
  *
  * unreleased (planned for 2020-03-15)
- *	(nothing yet)
+ *	New prefix_{ptr|len} fields in vrt_backend
  * 10.0 (2019-09-15)
  *	VRT_UpperLowerStrands added.
  *	VRT_synth_page now takes STRANDS argument
@@ -344,7 +344,9 @@ extern const void * const vrt_magic_string_unset;
 	vtim_dur			first_byte_timeout;	\
 	vtim_dur			between_bytes_timeout;	\
 	unsigned			max_connections;	\
-	unsigned			proxy_header;
+	unsigned			proxy_header;		\
+	void				*prefix_ptr;		\
+	unsigned			prefix_len;
 
 #define VRT_BACKEND_HANDLE()			\
 	do {					\
@@ -363,7 +365,7 @@ extern const void * const vrt_magic_string_unset;
 
 struct vrt_backend {
 	unsigned			magic;
-#define VRT_BACKEND_MAGIC		0x4799ce6b
+#define VRT_BACKEND_MAGIC		0x4799ce6c
 	VRT_BACKEND_FIELDS(const)
 	VCL_IP				ipv4_suckaddr;
 	VCL_IP				ipv6_suckaddr;