[PATCH v2 11/15] inany: Prepare inany.[ch] for sharing with pesto tool

[David Gibson <david@gibson.dropbear.id.au>]

inany contains a number of helpful functions for dealing with addresses
which might be IPv4 or IPv6.  We're going to want to use that in pesto.
For the most part inany doesn't depend on other passt/pasta internals,
however it does depend on siphash.h, which pesto doesn't need.

Move the single dependent function, inany_siphash_feed() to siphash.h,
renaming to match.  Use that include inany.[ch] into pesto as well as
passt/pasta.  While we're there reformat pesto.c's header comment to match
the convention used in most other files.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 Makefile  |  6 +++---
 common.h  |  7 +++++++
 flow.c    |  4 ++--
 fwd.c     |  2 +-
 inany.c   | 16 +++++++++++++---
 inany.h   | 16 ++--------------
 iov.c     |  1 +
 siphash.h | 13 +++++++++++++
 util.h    |  7 -------
 virtio.c  |  1 +
 10 files changed, 43 insertions(+), 30 deletions(-)

diff --git a/Makefile b/Makefile
index b9f20bb5..92809813 100644
--- a/Makefile
+++ b/Makefile
@@ -44,14 +44,14 @@ PASST_SRCS = arch.c arp.c checksum.c conf.c dhcp.c dhcpv6.c epoll_ctl.c \
 	udp.c udp_flow.c udp_vu.c util.c vhost_user.c virtio.c vu_common.c
 QRAP_SRCS = qrap.c
 PASST_REPAIR_SRCS = passt-repair.c
-PESTO_SRCS = pesto.c ip.c serialise.c
+PESTO_SRCS = pesto.c inany.c ip.c serialise.c
 SRCS = $(PASST_SRCS) $(QRAP_SRCS) $(PASST_REPAIR_SRCS) $(PESTO_SRCS)
 
 MANPAGES = passt.1 pasta.1 pesto.1 qrap.1 passt-repair.1
 
-PESTO_HEADERS = common.h ip.h pesto.h serialise.h
+PESTO_HEADERS = common.h inany.h ip.h pesto.h serialise.h
 PASST_HEADERS = arch.h arp.h checksum.h conf.h dhcp.h dhcpv6.h epoll_ctl.h \
-	flow.h fwd.h flow_table.h icmp.h icmp_flow.h inany.h iov.h isolation.h \
+	flow.h fwd.h flow_table.h icmp.h icmp_flow.h iov.h isolation.h \
 	lineread.h log.h migrate.h ndp.h netlink.h packet.h passt.h pasta.h \
 	pcap.h pif.h repair.h siphash.h tap.h tcp.h tcp_buf.h tcp_conn.h \
 	tcp_internal.h tcp_splice.h tcp_vu.h udp.h udp_flow.h udp_internal.h \
diff --git a/common.h b/common.h
index 7d6ba5c1..7d37b926 100644
--- a/common.h
+++ b/common.h
@@ -19,6 +19,13 @@
 /* FPRINTF() intentionally silences cert-err33-c clang-tidy warnings */
 #define FPRINTF(f, ...)	(void)fprintf(f, __VA_ARGS__)
 
+#ifndef MIN
+#define MIN(x, y)		(((x) < (y)) ? (x) : (y))
+#endif
+#ifndef MAX
+#define MAX(x, y)		(((x) > (y)) ? (x) : (y))
+#endif
+
 #define BIT(n)			(1UL << (n))
 
 #ifndef __bswap_constant_16
diff --git a/flow.c b/flow.c
index 11cd5752..607d0a41 100644
--- a/flow.c
+++ b/flow.c
@@ -678,8 +678,8 @@ static uint64_t flow_hash(const struct ctx *c, uint8_t proto, uint8_t pif,
 {
 	struct siphash_state state = SIPHASH_INIT(c->hash_secret);
 
-	inany_siphash_feed(&state, &side->oaddr);
-	inany_siphash_feed(&state, &side->eaddr);
+	siphash_feed_inany(&state, &side->oaddr);
+	siphash_feed_inany(&state, &side->eaddr);
 
 	return siphash_final(&state, 38, (uint64_t)proto << 40 |
 			     (uint64_t)pif << 32 |
diff --git a/fwd.c b/fwd.c
index 3395a28e..192969b7 100644
--- a/fwd.c
+++ b/fwd.c
@@ -86,7 +86,7 @@ static size_t neigh_table_slot(const struct ctx *c,
 	struct siphash_state st = SIPHASH_INIT(c->hash_secret);
 	uint32_t i;
 
-	inany_siphash_feed(&st, key);
+	siphash_feed_inany(&st, key);
 	i = siphash_final(&st, sizeof(*key), 0);
 
 	return ((size_t)i) & (NEIGH_TABLE_SIZE - 1);
diff --git a/inany.c b/inany.c
index 2a586ed1..426d2a64 100644
--- a/inany.c
+++ b/inany.c
@@ -1,9 +1,19 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later
- * Copyright Red Hat
- * Author: David Gibson <david@gibson.dropbear.id.au>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/* PASST - Plug A Simple Socket Transport
+ *  for qemu/UNIX domain socket mode
+ *
+ * PASTA - Pack A Subtle Tap Abstraction
+ *  for network namespace/tap device mode
+ *
+ * PESTO - Programmable Extensible Socket Translation Orchestrator
+ *  front-end for passt(1) and pasta(1) forwarding configuration
  *
  * inany.c - Types and helpers for handling addresses which could be
  *           IPv6 or IPv4 (encoded as IPv4-mapped IPv6 addresses)
+ *
+ * Copyright Red Hat
+ * Author: David Gibson <david@gibson.dropbear.id.au>
  */
 
 #include <stdlib.h>
diff --git a/inany.h b/inany.h
index 30e24164..6a1ff3c0 100644
--- a/inany.h
+++ b/inany.h
@@ -10,12 +10,11 @@
 #define INANY_H
 
 #include <assert.h>
+#include <stdbool.h>
+#include <stddef.h>
 #include <string.h>
 
 #include "ip.h"
-#include "siphash.h"
-
-struct siphash_state;
 
 /** union inany_addr - Represents either an IPv4 or IPv6 address
  * @a6:			Address as an IPv6 address, may be IPv4-mapped
@@ -299,17 +298,6 @@ static inline int inany_from_sockaddr(union inany_addr *dst, in_port_t *port,
 	return -1;
 }
 
-/** inany_siphash_feed- Fold IPv[46] address into an in-progress siphash
- * @state:	siphash state
- * @aa:		inany to hash
- */
-static inline void inany_siphash_feed(struct siphash_state *state,
-				      const union inany_addr *aa)
-{
-	siphash_feed(state, (uint64_t)aa->u32[0] << 32 | aa->u32[1]);
-	siphash_feed(state, (uint64_t)aa->u32[2] << 32 | aa->u32[3]);
-}
-
 #define INANY_ADDRSTRLEN	MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN)
 
 bool inany_matches(const union inany_addr *a, const union inany_addr *b);
diff --git a/iov.c b/iov.c
index ae074393..d291ee51 100644
--- a/iov.c
+++ b/iov.c
@@ -24,6 +24,7 @@
 #include <assert.h>
 #include <sys/socket.h>
 
+#include "common.h"
 #include "util.h"
 #include "iov.h"
 
diff --git a/siphash.h b/siphash.h
index bbddcac0..313b8947 100644
--- a/siphash.h
+++ b/siphash.h
@@ -47,6 +47,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "inany.h"
+
 /**
  * struct siphash_state - Internal state of siphash calculation
  */
@@ -101,6 +103,17 @@ static inline void siphash_feed(struct siphash_state *state, uint64_t in)
 	state->v[0] ^= in;
 }
 
+/** siphash_feed_inany() - Fold IPv[46] address into an in-progress siphash
+ * @state:	siphash state
+ * @aa:		inany to hash
+ */
+static inline void siphash_feed_inany(struct siphash_state *state,
+				      const union inany_addr *aa)
+{
+	siphash_feed(state, (uint64_t)aa->u32[0] << 32 | aa->u32[1]);
+	siphash_feed(state, (uint64_t)aa->u32[2] << 32 | aa->u32[3]);
+}
+
 /**
  * siphash_final() - Finalize SipHash calculations
  * @v:		siphash state (4 x 64-bit integers)
diff --git a/util.h b/util.h
index 5357814c..45792f46 100644
--- a/util.h
+++ b/util.h
@@ -28,13 +28,6 @@
 #define IP_MAX_MTU			USHRT_MAX
 #endif
 
-#ifndef MIN
-#define MIN(x, y)		(((x) < (y)) ? (x) : (y))
-#endif
-#ifndef MAX
-#define MAX(x, y)		(((x) > (y)) ? (x) : (y))
-#endif
-
 #define DIV_ROUND_UP(n, d)	(((n) + (d) - 1) / (d))
 #define DIV_ROUND_CLOSEST(n, d)	(((n) + (d) / 2) / (d))
 #define ROUND_DOWN(x, y)	((x) & ~((y) - 1))
diff --git a/virtio.c b/virtio.c
index f71dea1d..72b78af1 100644
--- a/virtio.c
+++ b/virtio.c
@@ -80,6 +80,7 @@
 #include <sys/eventfd.h>
 #include <sys/socket.h>
 
+#include "common.h"
 #include "util.h"
 #include "virtio.h"
 #include "vhost_user.h"
-- 
2.53.0