From 684c6f5a0e134426159be7dbd514271aea9f4d3d Mon Sep 17 00:00:00 2001
From: Pavel Machek <pavel@ucw.cz>
Date: Mon, 17 Apr 2000 11:06:39 +0000
Subject: [PATCH] Path_getlen moved to nest and length was made callable from
 filters.

---
 filter/config.Y  |  2 +-
 filter/filter.c  | 28 +++++++++++-----------------
 filter/test.conf |  2 ++
 nest/a-path.c    | 18 ++++++++++++++++++
 nest/attrs.h     |  7 ++++---
 5 files changed, 36 insertions(+), 21 deletions(-)

diff --git a/filter/config.Y b/filter/config.Y
index 0c2247dc..6ce89e7a 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -407,7 +407,7 @@ term:
  | rtadot dynamic_attr { $$ = $2; $$->code = P('e','a'); }
 
  | term '.' IP { $$ = f_new_inst(); $$->code = P('c','p'); $$->a1.p = $1; $$->aux = T_IP; }
- | term '.' LEN { $$ = f_new_inst(); $$->code = P('c','p'); $$->a1.p = $1; $$->aux = T_INT; }
+ | term '.' LEN { $$ = f_new_inst(); $$->code = 'L'; $$->a1.p = $1; }
  | term '.' MASK '(' term ')' { $$ = f_new_inst(); $$->code = P('i','M'); $$->a1.p = $1; $$->a2.p = $5; }
 
 /* Communities */
diff --git a/filter/filter.c b/filter/filter.c
index 768ff938..6763f0ce 100644
--- a/filter/filter.c
+++ b/filter/filter.c
@@ -404,13 +404,22 @@ interpret(struct f_inst *what)
     }
     break;
 
+  case 'L':	/* Get length of */
+    ONEARG;
+    res.type = T_INT;
+    switch(v1.type) {
+    case T_PREFIX: res.val.i = v1.val.px.len; break;
+    case T_PATH:   res.val.i = as_path_getlen(v1.val.ad); break;
+    default: bug( "Length of what?" );
+    }
+    break;
   case P('c','p'):	/* Convert prefix to ... */
     ONEARG;
     if (v1.type != T_PREFIX)
       runtime( "Can not convert non-prefix this way" );
     res.type = what->aux;
     switch(res.type) {
-    case T_INT:	res.val.i = v1.val.px.len; break;
+      /*    case T_INT:	res.val.i = v1.val.px.len; break; Not needed any more */
     case T_IP: res.val.px.ip = v1.val.px.ip; break;
     default: bug( "Unknown prefix to conversion" );
     }
@@ -536,7 +545,7 @@ i_same(struct f_inst *f1, struct f_inst *f2)
     if (val_compare(* (struct f_val *) f1->a1.p, * (struct f_val *) f2->a2.p))
       return 0;
     break;
-  case 'p': ONEARG; break;
+  case 'p': case 'L': ONEARG; break;
   case '?': TWOARGS; break;
   case '0': case 'E': break;
   case P('p',','): ONEARG; A2_SAME; break;
@@ -612,21 +621,6 @@ filter_same(struct filter *new, struct filter *old)
  * Or maybe both versions are usefull?
  */
 
-int
-path_getlen(u8 *p, int len)
-{
-  int res = 0;
-  u8 *q = p+len;
-  while (p<q) {
-    switch (*p++) {
-    case 1: len = *p++; res++;    p += 2*len; break;
-    case 2: len = *p++; res+=len; p += 2*len; break;
-    default: bug("This should not be in path");
-    }
-  }
-  return res;
-}
-
 #define MASK_PLUS do { mask = mask->next; if (!mask) return next == q; \
 		       asterix = (mask->val == PM_ANY); \
                        if (asterix) { mask = mask->next; if (!mask) { return 1; } } \
diff --git a/filter/test.conf b/filter/test.conf
index a31c7f2d..a39e6a3d 100644
--- a/filter/test.conf
+++ b/filter/test.conf
@@ -41,9 +41,11 @@ bgppath p2;
 	p2 = prepend( p2, 4 );
 	print "Testing paths: ", p2;
 	print "Should be true: ", p2 ~ p;
+	print "4 = ", p2.len;
 	p2 = prepend( p2, 5 );
 	print "Should be false: ", p2 ~ p;
 	print "Should be true: ", p2 ~ / * 4 3 2 1 /, p2, / * 4 3 2 1 /;
+	print "5 = ", p2.len;
 }
 
 function startup() 
diff --git a/nest/a-path.c b/nest/a-path.c
index ca39e296..d808bc9a 100644
--- a/nest/a-path.c
+++ b/nest/a-path.c
@@ -81,3 +81,21 @@ as_path_format(struct adata *path, byte *buf, unsigned int size)
     }
   *buf = 0;
 }
+
+int
+as_path_getlen(struct adata *path)
+{
+  int res = 0;
+  u8 *p = path->data;
+  u8 *q = p+path->length;
+  int len;
+
+  while (p<q) {
+    switch (*p++) {
+    case 1: len = *p++; res++;    p += 2*len; break;
+    case 2: len = *p++; res+=len; p += 2*len; break;
+    default: bug("This should not be in path");
+    }
+  }
+  return res;
+}
diff --git a/nest/attrs.h b/nest/attrs.h
index fc960fb5..67ec52d8 100644
--- a/nest/attrs.h
+++ b/nest/attrs.h
@@ -11,12 +11,13 @@
 
 /* a-path.c */
 
-struct adata *as_path_prepend(struct linpool *pool, struct adata *olda, int as);
-void as_path_format(struct adata *path, byte *buf, unsigned int size);
-
 #define AS_PATH_SET		1	/* Types of path segments */
 #define AS_PATH_SEQUENCE	2
 
+struct adata *as_path_prepend(struct linpool *pool, struct adata *olda, int as);
+void as_path_format(struct adata *path, byte *buf, unsigned int size);
+int as_path_getlen(struct adata *path);
+
 /* a-set.c */
 
 void int_set_format(struct adata *set, byte *buf, unsigned int size);