From: katerina.kubecova <katerina.kubecova@nic.cz>
Date: Tue, 19 Sep 2023 09:11:24 +0000 (+0200)
Subject: Bytestring attributes can be added to BGP
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56c995f9974245d8aa8505fb7c444e6a404484b3;p=thirdparty%2Fbird.git

Bytestring attributes can be added to BGP
---

diff --git a/filter/config.Y b/filter/config.Y
index 7e970185c..dfabddf7b 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -1002,7 +1002,6 @@ cmd:
  | UNSET '(' dynamic_attr ')' ';' {
      $$ = f_new_inst(FI_EA_UNSET, $3);
    }
-   
  | UNSET '(' symbol_known ')' ';' {
      switch ($3->class) {
        case SYM_ATTRIBUTE:
@@ -1012,7 +1011,6 @@ cmd:
 	 cf_error("Can't unset symbol %s", $3->name);
      }
  }
-  
  | break_command var_list_r ';' {
     $$ = f_print($2, !!$2, $1);
    }
diff --git a/filter/data.h b/filter/data.h
index 90e779c8c..3430455a5 100644
--- a/filter/data.h
+++ b/filter/data.h
@@ -99,6 +99,7 @@ struct f_dynamic_attr {
   u8 bit;		/* For bitfield accessors */
   enum f_type f_type;	/* Filter type */
   uint ea_code;		/* EA code */
+  uint flags;
 };
 
 enum f_sa_code {
diff --git a/filter/f-inst.c b/filter/f-inst.c
index 510c431f1..a7bec81ed 100644
--- a/filter/f-inst.c
+++ b/filter/f-inst.c
@@ -857,7 +857,7 @@
       l->flags = EALF_SORTED;
       l->count = 1;
       l->attrs[0].id = da.ea_code;
-      l->attrs[0].flags = 0;
+      l->attrs[0].flags = da.flags;
       l->attrs[0].type = da.type;
       l->attrs[0].originated = 1;
       l->attrs[0].fresh = 1;
diff --git a/filter/f-inst.h b/filter/f-inst.h
index 2bde6378c..955cfbdc7 100644
--- a/filter/f-inst.h
+++ b/filter/f-inst.h
@@ -118,6 +118,21 @@ static inline struct f_dynamic_attr f_new_dynamic_attr_bit(u8 bit, enum f_type f
 static inline struct f_static_attr f_new_static_attr(int f_type, int code, int readonly)
 { return (struct f_static_attr) { .f_type = f_type, .sa_code = code, .readonly = readonly }; }
 
+static inline int f_type_attr(int f_type) {
+  switch (f_type) {
+    case T_INT:		return EAF_TYPE_INT;
+    case T_IP:		return EAF_TYPE_IP_ADDRESS;
+    case T_QUAD:	return EAF_TYPE_ROUTER_ID;
+    case T_PATH:	return EAF_TYPE_AS_PATH;
+    case T_CLIST:	return EAF_TYPE_INT_SET;
+    case T_ECLIST:	return EAF_TYPE_EC_SET;
+    case T_LCLIST:	return EAF_TYPE_LC_SET;
+    case T_BYTESTRING:	return EAF_TYPE_OPAQUE;
+    default:
+      cf_error("Custom route attribute of unsupported type");
+  }
+}
+
 /* Hook for call bt_assert() function in configuration */
 extern void (*bt_assert_hook)(int result, const struct f_line_item *assert);
 
diff --git a/filter/f-util.c b/filter/f-util.c
index b655ea04f..a47a87477 100644
--- a/filter/f-util.c
+++ b/filter/f-util.c
@@ -295,8 +295,8 @@ ca_lookup(pool *p, const char *name, int f_type)
       ea_type = EAF_TYPE_LC_SET;
       break;
     case T_BYTESTRING:
-    	ea_type = EAF_TYPE_OPAQUE;
-    	break;
+      ea_type = EAF_TYPE_OPAQUE;
+      break;
     default:
       cf_error("Custom route attribute of unsupported type");
   }
diff --git a/proto/bgp/config.Y b/proto/bgp/config.Y
index a1f1f5ac4..d9ff24d82 100644
--- a/proto/bgp/config.Y
+++ b/proto/bgp/config.Y
@@ -362,7 +362,16 @@ dynamic_attr: BGP_LARGE_COMMUNITY
 dynamic_attr: BGP_OTC
 	{ $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_INT, EA_CODE(PROTOCOL_BGP, BA_ONLY_TO_CUSTOMER)); } ;
 
-
+custom_attr: ATTRIBUTE BGP NUM type symbol ';' {
+  if($3 > 255 || $3 < 1)
+    cf_error("Invalid attribute number. (Given %i, must be 1-255.)", $3);
+  if($4 != T_BYTESTRING)
+    cf_error("Attribute type must be bytestring, not %s.", f_type_name($4));
+  struct f_dynamic_attr* a = (struct f_dynamic_attr*) malloc(sizeof(struct f_dynamic_attr));
+  *a = f_new_dynamic_attr(f_type_attr($4), T_BYTESTRING, EA_CODE(PROTOCOL_BGP, $3));
+  a->flags = BAF_TRANSITIVE | BAF_OPTIONAL;
+  cf_define_symbol(new_config, $5, SYM_ATTRIBUTE, attribute, a);
+};
 
 CF_ENUM(T_ENUM_BGP_ORIGIN, ORIGIN_, IGP, EGP, INCOMPLETE)