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Add !~ operator to filter grammar

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This commit is contained in:
Pavel Tvrdik
2016-09-20 15:13:01 +02:00
committed by Ondrej Zajicek (work)
parent 75ac3d199d
commit 768d5e1058
5 changed files with 32 additions and 20 deletions
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1
conf/cf-lex.l
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@@ -246,6 +246,7 @@ else: {
<CCOMM>.
\!\= return NEQ;
\!\~ return NMA;
\<\= return LEQ;
\>\= return GEQ;
\&\& return AND;

2
conf/confbase.Y
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@@ -82,7 +82,7 @@ CF_DECLS
%nonassoc PREFIX_DUMMY
%left AND OR
%nonassoc '=' '<' '>' '~' GEQ LEQ NEQ PO PC
%nonassoc '=' '<' '>' '~' GEQ LEQ NEQ NMA PO PC
%left '+' '-'
%left '*' '/' '%'
%left '!'

38
doc/bird.sgml
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@@ -1016,9 +1016,9 @@ foot).
of type <cf/string/, print such variables, use standard string
comparison operations (e.g. <cf/=, !=, &lt;, &gt;, &lt;=, &gt;=/), but
you can't concatenate two strings. String literals are written as
<cf/"This is a string constant"/. Additionally matching <cf/&tilde;/
operator could be used to match a string value against a shell pattern
(represented also as a string).
<cf/"This is a string constant"/. Additionally matching (<cf/&tilde;,
!&tilde;/) operators could be used to match a string value against
a shell pattern (represented also as a string).
<tag/ip/
This type can hold a single IP address. Depending on the compile-time
@@ -1202,9 +1202,9 @@ foot).
<tag/eclist/
Eclist is a data type used for BGP extended community lists. Eclists
are very similar to clists, but they are sets of ECs instead of pairs.
The same operations (like <cf/add/, <cf/delete/, or <cf/&tilde;/
membership operator) can be used to modify or test eclists, with ECs
instead of pairs as arguments.
The same operations (like <cf/add/, <cf/delete/ or <cf/&tilde;/ and
<cf/!&tilde;/ membership operators) can be used to modify or test
eclists, with ECs instead of pairs as arguments.
</descrip>
@@ -1213,19 +1213,19 @@ foot).
<p>The filter language supports common integer operators <cf>(+,-,*,/)</cf>,
parentheses <cf/(a*(b+c))/, comparison <cf/(a=b, a!=b, a&lt;b, a&gt;=b)/.
Logical operations include unary not (<cf/!/), and (<cf/&amp;&amp;/) and or
(<cf/&verbar;&verbar;/). Special operators include <cf/&tilde;/ for "is element
of a set" operation - it can be used on element and set of elements of the same
type (returning true if element is contained in the given set), or on two
strings (returning true if first string matches a shell-like pattern stored in
second string) or on IP and prefix (returning true if IP is within the range
defined by that prefix), or on prefix and prefix (returning true if first prefix
is more specific than second one) or on bgppath and bgpmask (returning true if
the path matches the mask) or on number and bgppath (returning true if the
number is in the path) or on bgppath and int (number) set (returning true if any
ASN from the path is in the set) or on pair/quad and clist (returning true if
the pair/quad is element of the clist) or on clist and pair/quad set (returning
true if there is an element of the clist that is also a member of the pair/quad
set).
(<cf/&verbar;&verbar;/). Special operators include (<cf/&tilde;/,
<cf/!&tilde;/) for "is (not) element of a set" operation - it can be used on
element and set of elements of the same type (returning true if element is
contained in the given set), or on two strings (returning true if first string
matches a shell-like pattern stored in second string) or on IP and prefix
(returning true if IP is within the range defined by that prefix), or on prefix
and prefix (returning true if first prefix is more specific than second one) or
on bgppath and bgpmask (returning true if the path matches the mask) or on
number and bgppath (returning true if the number is in the path) or on bgppath
and int (number) set (returning true if any ASN from the path is in the set) or
on pair/quad and clist (returning true if the pair/quad is element of the
clist) or on clist and pair/quad set (returning true if there is an element of
the clist that is also a member of the pair/quad set).
<p>There is one operator related to ROA infrastructure - <cf/roa_check()/. It
examines a ROA table and does RFC 6483 route origin validation for a given

1
filter/config.Y
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@@ -735,6 +735,7 @@ term:
| term '>' term { $$ = f_new_inst(); $$->code = '<'; $$->a1.p = $3; $$->a2.p = $1; }
| term GEQ term { $$ = f_new_inst(); $$->code = P('<','='); $$->a1.p = $3; $$->a2.p = $1; }
| term '~' term { $$ = f_new_inst(); $$->code = '~'; $$->a1.p = $1; $$->a2.p = $3; }
| term NMA term { $$ = f_new_inst(); $$->code = P('!','~'); $$->a1.p = $1; $$->a2.p = $3; }
| '!' term { $$ = f_new_inst(); $$->code = '!'; $$->a1.p = $2; }
| DEFINED '(' term ')' { $$ = f_new_inst(); $$->code = P('d','e'); $$->a1.p = $3; }

10
filter/filter.c
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@@ -716,6 +716,16 @@ interpret(struct f_inst *what)
runtime( "~ applied on unknown type pair" );
res.val.i = !!res.val.i;
break;
case P('!','~'):
TWOARGS;
res.type = T_BOOL;
res.val.i = val_in_range(v1, v2);
if (res.val.i == CMP_ERROR)
runtime( "!~ applied on unknown type pair" );
res.val.i = !res.val.i;
break;
case P('d','e'):
ONEARG;
res.type = T_BOOL;