From 0d0f6554a5c233bf2bf830ae319191c4b1808d49 Mon Sep 17 00:00:00 2001
From: Maria Matejka <mq@ucw.cz>
Date: Sat, 26 Mar 2022 11:56:02 +0100
Subject: Unified attribute and filter types

This commit removes the EAF_TYPE_* namespace completely and also for
route attributes, filter-based types T_* are used. This simplifies
fetching and setting route attributes from filters.

Also, there is now union bval which serves as an universal value holder
instead of private unions held separately by eattr and filter code.
---
 lib/type.h | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 lib/type.h

(limited to 'lib')

diff --git a/lib/type.h b/lib/type.h
new file mode 100644
index 00000000..d0a887d8
--- /dev/null
+++ b/lib/type.h
@@ -0,0 +1,87 @@
+/*
+ *     BIRD Internet Routing Daemon -- Internal Data Types
+ *
+ *     (c) 2022 Maria Matejka <mq@jmq.cz>
+ *
+ *     Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_TYPE_H_
+#define _BIRD_TYPE_H_
+
+#include "lib/birdlib.h"
+
+union bval {
+#define BVAL_ITEMS	\
+  u32 data;			/* Integer type inherited from eattrs */		\
+  u32 i;			/* Integer type inherited from filters */		\
+  const struct adata *ptr;	/* Generic attribute data inherited from eattrs */	\
+  const struct adata *ad;     	/* Generic attribute data inherited from filters */	\
+
+  BVAL_ITEMS
+};
+
+/* Internal types */
+enum btype {
+/* Nothing. Simply nothing. */
+  T_VOID = 0,
+
+/* Something but inaccessible. */
+  T_OPAQUE = 0x02,		/* Opaque byte string (not filterable) */
+  T_IFACE = 0x0c,		/* Pointer to an interface (inside adata) */
+
+/* Types shared with eattrs */
+  T_INT = 0x01,			/* 32-bit unsigned integer number */
+  T_IP = 0x04,			/* IP address */
+  T_QUAD = 0x05,		/* Router ID (IPv4 address) */
+  T_PATH = 0x06,		/* BGP AS path (encoding per RFC 1771:4.3) */
+  T_CLIST = 0x0a,		/* Set of u32's (e.g., a community list) */
+  T_ECLIST = 0x0e,		/* Set of pairs of u32's - ext. community list */
+  T_LCLIST = 0x08,		/* Set of triplets of u32's - large community list */
+
+  T_ENUM_BGP_ORIGIN = 0x11,	/* BGP Origin enum */
+  T_ENUM_RA_PREFERENCE = 0x13,	/* RA Preference enum */
+
+#define EAF_TYPE__MAX 0x1f
+#define EAF_EMBEDDED 0x01		/* Data stored in eattr.u.data (part of type spec) */
+					/* Otherwise, attribute data is adata */
+
+/* Other user visible types which fit in int */
+  T_BOOL = 0xa0,
+  T_PAIR = 0xa4,  /*	Notice that pair is stored as integer: first << 16 | second */
+
+/* Put enumerational types in 0x20..0x3f range */
+  T_ENUM_LO = 0x10,
+  T_ENUM_HI = 0x3f,
+
+  T_ENUM_RTS = 0x31,
+  T_ENUM_SCOPE = 0x33,
+  T_ENUM_RTC = 0x35,
+  T_ENUM_RTD = 0x37,
+  T_ENUM_ROA = 0x39,
+  T_ENUM_NETTYPE = 0x3b,
+  T_ENUM_AF = 0x3d,
+
+/* new enums go here */
+
+#define T_ENUM T_ENUM_LO ... T_ENUM_HI
+
+/* Bigger ones */
+  T_NET = 0xb0,
+  T_STRING = 0xb4,
+  T_PATH_MASK = 0xb8,	/* mask for BGP path */
+  T_EC = 0xbc,		/* Extended community value, u64 */
+  T_LC = 0xc0,		/* Large community value, lcomm */
+  T_RD = 0xc4,		/* Route distinguisher for VPN addresses */
+  T_PATH_MASK_ITEM = 0xc8,	/* Path mask item for path mask constructors */
+
+  T_SET = 0x80,
+  T_PREFIX_SET = 0x84,
+} PACKED;
+
+typedef enum btype btype;
+
+STATIC_ASSERT(sizeof(btype) == sizeof(byte));
+
+
+#endif
-- 
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