npf_parse.y revision 1.25 1 /* $NetBSD: npf_parse.y,v 1.25 2013/09/19 01:04:45 rmind Exp $ */
2
3 /*-
4 * Copyright (c) 2011-2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Martin Husemann and Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 %{
33
34 #include <stdio.h>
35 #include <err.h>
36 #include <vis.h>
37 #include <netdb.h>
38
39 #include "npfctl.h"
40
41 #define YYSTACKSIZE 4096
42
43 int yyparsetarget;
44 const char * yyfilename;
45
46 extern int yylineno, yycolumn;
47 extern int yylex(void);
48
49 /* Variable under construction (bottom up). */
50 static npfvar_t * cvar;
51
52 void
53 yyerror(const char *fmt, ...)
54 {
55 extern int yyleng;
56 extern char *yytext;
57
58 char *msg, *context = estrndup(yytext, yyleng);
59 bool eol = (*context == '\n');
60 va_list ap;
61
62 va_start(ap, fmt);
63 vasprintf(&msg, fmt, ap);
64 va_end(ap);
65
66 fprintf(stderr, "%s:%d:%d: %s", yyfilename,
67 yylineno - (int)eol, yycolumn, msg);
68 if (!eol) {
69 size_t len = strlen(context);
70 char *dst = ecalloc(1, len * 4 + 1);
71
72 strvisx(dst, context, len, VIS_WHITE|VIS_CSTYLE);
73 fprintf(stderr, " near '%s'", dst);
74 }
75 fprintf(stderr, "\n");
76 exit(EXIT_FAILURE);
77 }
78
79 #define CHECK_PARSER_FILE \
80 if (yyparsetarget != NPFCTL_PARSE_FILE) \
81 yyerror("rule must be in the group");
82
83 #define CHECK_PARSER_STRING \
84 if (yyparsetarget != NPFCTL_PARSE_STRING) \
85 yyerror("invalid rule syntax");
86
87 %}
88
89 %token ALG
90 %token ALL
91 %token ANY
92 %token APPLY
93 %token ARROWBOTH
94 %token ARROWLEFT
95 %token ARROWRIGHT
96 %token BLOCK
97 %token CURLY_CLOSE
98 %token CURLY_OPEN
99 %token CODE
100 %token COLON
101 %token COMMA
102 %token DEFAULT
103 %token TDYNAMIC
104 %token TSTATIC
105 %token EQ
106 %token TFILE
107 %token FLAGS
108 %token FROM
109 %token GROUP
110 %token HASH
111 %token ICMPTYPE
112 %token ID
113 %token IFNET
114 %token IN
115 %token INET
116 %token INET6
117 %token INTERFACE
118 %token MAP
119 %token MINUS
120 %token NAME
121 %token ON
122 %token OUT
123 %token PAR_CLOSE
124 %token PAR_OPEN
125 %token PASS
126 %token PORT
127 %token PROCEDURE
128 %token PROTO
129 %token FAMILY
130 %token FINAL
131 %token FORW
132 %token RETURN
133 %token RETURNICMP
134 %token RETURNRST
135 %token RULESET
136 %token SEPLINE
137 %token SLASH
138 %token STATEFUL
139 %token TABLE
140 %token TCP
141 %token TO
142 %token TREE
143 %token TYPE
144 %token <num> ICMP
145 %token <num> ICMP6
146
147 %token <num> HEX
148 %token <str> IDENTIFIER
149 %token <str> IPV4ADDR
150 %token <str> IPV6ADDR
151 %token <num> NUM
152 %token <fpnum> FPNUM
153 %token <str> STRING
154 %token <str> TABLE_ID
155 %token <str> VAR_ID
156
157 %type <str> addr, some_name, list_elem, table_store, string
158 %type <str> proc_param_val, opt_apply
159 %type <num> ifindex, port, opt_final, on_ifindex, number
160 %type <num> afamily, opt_family
161 %type <num> block_or_pass, rule_dir, block_opts
162 %type <num> opt_stateful, icmp_type, table_type, map_sd, map_type
163 %type <var> ifnet, addr_or_ifnet, port_range, icmp_type_and_code
164 %type <var> filt_addr, addr_and_mask, tcp_flags, tcp_flags_and_mask
165 %type <var> procs, proc_call, proc_param_list, proc_param
166 %type <addrport> mapseg
167 %type <filtopts> filt_opts, all_or_filt_opts
168 %type <optproto> opt_proto
169 %type <rulegroup> group_attr, group_opt
170
171 %union {
172 char * str;
173 unsigned long num;
174 double fpnum;
175 npfvar_t * var;
176 addr_port_t addrport;
177 filt_opts_t filtopts;
178 opt_proto_t optproto;
179 rule_group_t rulegroup;
180 }
181
182 %%
183
184 input
185 : { CHECK_PARSER_FILE } lines
186 | { CHECK_PARSER_STRING } rule
187 ;
188
189 lines
190 : line SEPLINE lines
191 | line
192 ;
193
194 line
195 : def
196 | table
197 | map
198 | group
199 | rproc
200 | alg
201 |
202 ;
203
204 def
205 : VAR_ID
206 {
207 cvar = npfvar_create($1);
208 npfvar_add(cvar);
209 }
210 EQ definition
211 {
212 cvar = NULL;
213 }
214 ;
215
216 definition
217 : list_elem
218 | listdef
219 ;
220
221 listdef
222 : CURLY_OPEN list_elems CURLY_CLOSE
223 ;
224
225 list_elems
226 : list_elem COMMA list_elems
227 | list_elem
228 ;
229
230 list_elem
231 : IDENTIFIER
232 {
233 npfvar_t *vp = npfvar_create(".identifier");
234 npfvar_add_element(vp, NPFVAR_IDENTIFIER, $1, strlen($1) + 1);
235 npfvar_add_elements(cvar, vp);
236 }
237 | STRING
238 {
239 npfvar_t *vp = npfvar_create(".string");
240 npfvar_add_element(vp, NPFVAR_STRING, $1, strlen($1) + 1);
241 npfvar_add_elements(cvar, vp);
242 }
243 | number MINUS number
244 {
245 npfvar_t *vp = npfctl_parse_port_range($1, $3);
246 npfvar_add_elements(cvar, vp);
247 }
248 | number
249 {
250 npfvar_t *vp = npfvar_create(".num");
251 npfvar_add_element(vp, NPFVAR_NUM, &$1, sizeof($1));
252 npfvar_add_elements(cvar, vp);
253 }
254 | VAR_ID
255 {
256 npfvar_t *vp = npfvar_create(".var_id");
257 npfvar_add_element(vp, NPFVAR_VAR_ID, $1, strlen($1) + 1);
258 npfvar_add_elements(cvar, vp);
259 }
260 | ifnet
261 {
262 npfvar_add_elements(cvar, $1);
263 }
264 | addr_and_mask
265 {
266 npfvar_add_elements(cvar, $1);
267 }
268 ;
269
270 table
271 : TABLE TABLE_ID TYPE table_type table_store
272 {
273 npfctl_build_table($2, $4, $5);
274 }
275 ;
276
277 table_type
278 : HASH { $$ = NPF_TABLE_HASH; }
279 | TREE { $$ = NPF_TABLE_TREE; }
280 ;
281
282 table_store
283 : TDYNAMIC { $$ = NULL; }
284 | TFILE STRING { $$ = $2; }
285 ;
286
287 map_sd
288 : TSTATIC { $$ = NPFCTL_NAT_STATIC; }
289 | TDYNAMIC { $$ = NPFCTL_NAT_DYNAMIC; }
290 | { $$ = NPFCTL_NAT_DYNAMIC; }
291 ;
292
293 map_type
294 : ARROWBOTH { $$ = NPF_NATIN | NPF_NATOUT; }
295 | ARROWLEFT { $$ = NPF_NATIN; }
296 | ARROWRIGHT { $$ = NPF_NATOUT; }
297 ;
298
299 mapseg
300 : addr_or_ifnet port_range
301 {
302 $$.ap_netaddr = $1;
303 $$.ap_portrange = $2;
304 }
305 ;
306
307 map
308 : MAP ifindex map_sd mapseg map_type mapseg PASS filt_opts
309 {
310 npfctl_build_natseg($3, $5, $2, &$4, &$6, &$8);
311 }
312 | MAP ifindex map_sd mapseg map_type mapseg
313 {
314 npfctl_build_natseg($3, $5, $2, &$4, &$6, NULL);
315 }
316 | MAP RULESET PAR_OPEN group_attr PAR_CLOSE
317 {
318 npfctl_build_maprset($4.rg_name, $4.rg_attr, $4.rg_ifnum);
319 }
320 ;
321
322 rproc
323 : PROCEDURE STRING CURLY_OPEN procs CURLY_CLOSE
324 {
325 npfctl_build_rproc($2, $4);
326 }
327 ;
328
329 alg
330 : ALG STRING
331 {
332 npfctl_build_alg($2);
333 }
334 ;
335
336 procs
337 : proc_call SEPLINE procs
338 {
339 $$ = npfvar_add_elements($1, $3);
340 }
341 | proc_call { $$ = $1; }
342 ;
343
344 proc_call
345 : IDENTIFIER COLON proc_param_list
346 {
347 proc_call_t pc;
348
349 pc.pc_name = estrdup($1);
350 pc.pc_opts = $3;
351 $$ = npfvar_create(".proc_call");
352 npfvar_add_element($$, NPFVAR_PROC, &pc, sizeof(pc));
353 }
354 | { $$ = NULL; }
355 ;
356
357 proc_param_list
358 : proc_param COMMA proc_param_list
359 {
360 $$ = npfvar_add_elements($1, $3);
361 }
362 | proc_param { $$ = $1; }
363 | { $$ = NULL; }
364 ;
365
366 proc_param
367 /* Key and value pair. */
368 : some_name proc_param_val
369 {
370 proc_param_t pp;
371
372 pp.pp_param = estrdup($1);
373 pp.pp_value = $2 ? estrdup($2) : NULL;
374 $$ = npfvar_create(".proc_param");
375 npfvar_add_element($$, NPFVAR_PROC_PARAM, &pp, sizeof(pp));
376 }
377 ;
378
379 proc_param_val
380 : some_name { $$ = $1; }
381 | number { (void)asprintf(&$$, "%ld", $1); }
382 | FPNUM { (void)asprintf(&$$, "%lf", $1); }
383 | { $$ = NULL; }
384 ;
385
386 group
387 : GROUP PAR_OPEN group_attr PAR_CLOSE
388 {
389 /* Build a group. Increases the nesting level. */
390 npfctl_build_group($3.rg_name, $3.rg_attr,
391 $3.rg_ifnum, $3.rg_default);
392 }
393 ruleset_block
394 {
395 /* Decrease the nesting level. */
396 npfctl_build_group_end();
397 }
398 ;
399
400 ruleset
401 : RULESET PAR_OPEN group_attr PAR_CLOSE
402 {
403 /* Ruleset is a dynamic group. */
404 npfctl_build_group($3.rg_name, $3.rg_attr | NPF_RULE_DYNAMIC,
405 $3.rg_ifnum, $3.rg_default);
406 npfctl_build_group_end();
407 }
408
409 group_attr
410 : group_opt COMMA group_attr
411 {
412 $$ = $3;
413
414 if (($1.rg_name && $$.rg_name) ||
415 ($1.rg_ifnum && $$.rg_ifnum) ||
416 ($1.rg_attr & $$.rg_attr) != 0)
417 yyerror("duplicate group option");
418
419 if ($1.rg_name) {
420 $$.rg_name = $1.rg_name;
421 }
422 if ($1.rg_attr) {
423 $$.rg_attr |= $1.rg_attr;
424 }
425 if ($1.rg_ifnum) {
426 $$.rg_ifnum = $1.rg_ifnum;
427 }
428 if ($1.rg_default) {
429 $$.rg_default = $1.rg_default;
430 }
431 }
432 | group_opt { $$ = $1; }
433 ;
434
435 group_opt
436 : DEFAULT
437 {
438 memset(&$$, 0, sizeof(rule_group_t));
439 $$.rg_default = true;
440 }
441 | NAME STRING
442 {
443 memset(&$$, 0, sizeof(rule_group_t));
444 $$.rg_name = $2;
445 }
446 | INTERFACE ifindex
447 {
448 memset(&$$, 0, sizeof(rule_group_t));
449 $$.rg_ifnum = $2;
450 }
451 | TDYNAMIC
452 {
453 memset(&$$, 0, sizeof(rule_group_t));
454 $$.rg_attr = NPF_RULE_DYNAMIC;
455 }
456 | FORW
457 {
458 memset(&$$, 0, sizeof(rule_group_t));
459 $$.rg_attr = NPF_RULE_FORW;
460 }
461 | rule_dir
462 {
463 memset(&$$, 0, sizeof(rule_group_t));
464 $$.rg_attr = $1;
465 }
466 ;
467
468 ruleset_block
469 : CURLY_OPEN ruleset_def CURLY_CLOSE
470 ;
471
472 ruleset_def
473 : rule_group SEPLINE ruleset_def
474 | rule_group
475 ;
476
477 rule_group
478 : rule
479 | group
480 | ruleset
481 |
482 ;
483
484 rule
485 : block_or_pass opt_stateful rule_dir opt_final on_ifindex
486 opt_family opt_proto all_or_filt_opts opt_apply
487 {
488 npfctl_build_rule($1 | $2 | $3 | $4, $5,
489 $6, &$7, &$8, $9);
490 }
491 ;
492
493 block_or_pass
494 : BLOCK block_opts { $$ = $2; }
495 | PASS { $$ = NPF_RULE_PASS; }
496 ;
497
498 rule_dir
499 : IN { $$ = NPF_RULE_IN; }
500 | OUT { $$ = NPF_RULE_OUT; }
501 | { $$ = NPF_RULE_IN | NPF_RULE_OUT; }
502 ;
503
504 opt_final
505 : FINAL { $$ = NPF_RULE_FINAL; }
506 | { $$ = 0; }
507 ;
508
509 on_ifindex
510 : ON ifindex { $$ = $2; }
511 | { $$ = 0; }
512 ;
513
514 afamily
515 : INET { $$ = AF_INET; }
516 | INET6 { $$ = AF_INET6; }
517 ;
518
519 opt_family
520 : FAMILY afamily { $$ = $2; }
521 | { $$ = AF_UNSPEC; }
522 ;
523
524 opt_proto
525 : PROTO TCP tcp_flags_and_mask
526 {
527 $$.op_proto = IPPROTO_TCP;
528 $$.op_opts = $3;
529 }
530 | PROTO ICMP icmp_type_and_code
531 {
532 $$.op_proto = IPPROTO_ICMP;
533 $$.op_opts = $3;
534 }
535 | PROTO ICMP6 icmp_type_and_code
536 {
537 $$.op_proto = IPPROTO_ICMPV6;
538 $$.op_opts = $3;
539 }
540 | PROTO some_name
541 {
542 $$.op_proto = npfctl_protono($2);
543 $$.op_opts = NULL;
544 }
545 | PROTO number
546 {
547 $$.op_proto = $2;
548 $$.op_opts = NULL;
549 }
550 |
551 {
552 $$.op_proto = -1;
553 $$.op_opts = NULL;
554 }
555 ;
556
557 all_or_filt_opts
558 : ALL
559 {
560 $$.fo_from.ap_netaddr = NULL;
561 $$.fo_from.ap_portrange = NULL;
562 $$.fo_to.ap_netaddr = NULL;
563 $$.fo_to.ap_portrange = NULL;
564 }
565 | filt_opts { $$ = $1; }
566 ;
567
568 opt_stateful
569 : STATEFUL { $$ = NPF_RULE_STATEFUL; }
570 | { $$ = 0; }
571 ;
572
573 opt_apply
574 : APPLY STRING { $$ = $2; }
575 | { $$ = NULL; }
576 ;
577
578 block_opts
579 : RETURNRST { $$ = NPF_RULE_RETRST; }
580 | RETURNICMP { $$ = NPF_RULE_RETICMP; }
581 | RETURN { $$ = NPF_RULE_RETRST | NPF_RULE_RETICMP; }
582 | { $$ = 0; }
583 ;
584
585 filt_opts
586 : FROM filt_addr port_range TO filt_addr port_range
587 {
588 $$.fo_from.ap_netaddr = $2;
589 $$.fo_from.ap_portrange = $3;
590 $$.fo_to.ap_netaddr = $5;
591 $$.fo_to.ap_portrange = $6;
592 }
593 | FROM filt_addr port_range
594 {
595 $$.fo_from.ap_netaddr = $2;
596 $$.fo_from.ap_portrange = $3;
597 $$.fo_to.ap_netaddr = NULL;
598 $$.fo_to.ap_portrange = NULL;
599 }
600 | TO filt_addr port_range
601 {
602 $$.fo_from.ap_netaddr = NULL;
603 $$.fo_from.ap_portrange = NULL;
604 $$.fo_to.ap_netaddr = $2;
605 $$.fo_to.ap_portrange = $3;
606 }
607 ;
608
609 filt_addr
610 : addr_or_ifnet { $$ = $1; }
611 | TABLE_ID { $$ = npfctl_parse_table_id($1); }
612 | ANY { $$ = NULL; }
613 ;
614
615 addr_and_mask
616 : addr SLASH number
617 {
618 $$ = npfctl_parse_fam_addr_mask($1, NULL, &$3);
619 }
620 | addr SLASH addr
621 {
622 $$ = npfctl_parse_fam_addr_mask($1, $3, NULL);
623 }
624 | addr
625 {
626 $$ = npfctl_parse_fam_addr_mask($1, NULL, NULL);
627 }
628 ;
629
630 addr_or_ifnet
631 : addr_and_mask
632 {
633 assert($1 != NULL);
634 $$ = $1;
635 }
636 | ifnet
637 {
638 ifnet_addr_t *ifna = npfvar_get_data($1, NPFVAR_INTERFACE, 0);
639 $$ = ifna->ifna_addrs;
640 }
641 | VAR_ID
642 {
643 npfvar_t *vp = npfvar_lookup($1);
644 int type = npfvar_get_type(vp, 0);
645 ifnet_addr_t *ifna;
646
647 again:
648 switch (type) {
649 case NPFVAR_IDENTIFIER:
650 case NPFVAR_STRING:
651 vp = npfctl_parse_ifnet(npfvar_expand_string(vp),
652 AF_UNSPEC);
653 type = npfvar_get_type(vp, 0);
654 goto again;
655 case NPFVAR_FAM:
656 $$ = vp;
657 break;
658 case NPFVAR_INTERFACE:
659 ifna = npfvar_get_data(vp, type, 0);
660 $$ = ifna->ifna_addrs;
661 break;
662 case -1:
663 yyerror("undefined variable '%s'", $1);
664 break;
665 default:
666 yyerror("wrong variable '%s' type '%s' for address "
667 "or interface", $1, npfvar_type(type));
668 break;
669 }
670 }
671 ;
672
673 addr
674 : IPV4ADDR { $$ = $1; }
675 | IPV6ADDR { $$ = $1; }
676 ;
677
678 port_range
679 : PORT port /* just port */
680 {
681 $$ = npfctl_parse_port_range($2, $2);
682 }
683 | PORT port MINUS port /* port from-to */
684 {
685 $$ = npfctl_parse_port_range($2, $4);
686 }
687 | PORT VAR_ID
688 {
689 $$ = npfctl_parse_port_range_variable($2);
690 }
691 |
692 {
693 $$ = NULL;
694 }
695 ;
696
697 port
698 : number { $$ = $1; }
699 | IDENTIFIER { $$ = npfctl_portno($1); }
700 | STRING { $$ = npfctl_portno($1); }
701 ;
702
703 icmp_type_and_code
704 : ICMPTYPE icmp_type
705 {
706 $$ = npfctl_parse_icmp($<num>0, $2, -1);
707 }
708 | ICMPTYPE icmp_type CODE number
709 {
710 $$ = npfctl_parse_icmp($<num>0, $2, $4);
711 }
712 | ICMPTYPE icmp_type CODE IDENTIFIER
713 {
714 $$ = npfctl_parse_icmp($<num>0, $2,
715 npfctl_icmpcode($<num>0, $2, $4));
716 }
717 | ICMPTYPE icmp_type CODE VAR_ID
718 {
719 char *s = npfvar_expand_string(npfvar_lookup($4));
720 $$ = npfctl_parse_icmp($<num>0, $2,
721 npfctl_icmpcode($<num>0, $2, s));
722 }
723 | { $$ = NULL; }
724 ;
725
726 tcp_flags_and_mask
727 : FLAGS tcp_flags SLASH tcp_flags
728 {
729 npfvar_add_elements($2, $4);
730 $$ = $2;
731 }
732 | FLAGS tcp_flags
733 {
734 char *s = npfvar_get_data($2, NPFVAR_TCPFLAG, 0);
735 npfvar_add_elements($2, npfctl_parse_tcpflag(s));
736 $$ = $2;
737 }
738 | { $$ = NULL; }
739 ;
740
741 tcp_flags
742 : IDENTIFIER { $$ = npfctl_parse_tcpflag($1); }
743 ;
744
745 icmp_type
746 : number { $$ = $1; }
747 | IDENTIFIER { $$ = npfctl_icmptype($<num>-1, $1); }
748 | VAR_ID
749 {
750 char *s = npfvar_expand_string(npfvar_lookup($1));
751 $$ = npfctl_icmptype($<num>-1, s);
752 }
753 ;
754
755 string
756 : IDENTIFIER
757 {
758 $$ = $1;
759 }
760 | VAR_ID
761 {
762 npfvar_t *vp = npfvar_lookup($1);
763 const int type = npfvar_get_type(vp, 0);
764
765 switch (type) {
766 case NPFVAR_STRING:
767 case NPFVAR_IDENTIFIER:
768 $$ = npfvar_expand_string(vp);
769 break;
770 case -1:
771 yyerror("undefined variable '%s' for interface", $1);
772 break;
773 default:
774 yyerror("wrong variable '%s' type '%s' for string",
775 $1, npfvar_type(type));
776 break;
777 }
778 }
779 ;
780
781 ifnet
782 : IFNET PAR_OPEN string PAR_CLOSE
783 {
784 $$ = npfctl_parse_ifnet($3, AF_UNSPEC);
785 }
786 | afamily PAR_OPEN string PAR_CLOSE
787 {
788 $$ = npfctl_parse_ifnet($3, $1);
789 }
790 ;
791
792 ifindex
793 : some_name
794 {
795 $$ = npfctl_find_ifindex($1);
796 }
797 | ifnet
798 {
799 ifnet_addr_t *ifna = npfvar_get_data($1, NPFVAR_INTERFACE, 0);
800 $$ = ifna->ifna_index;
801 }
802 | VAR_ID
803 {
804 npfvar_t *vp = npfvar_lookup($1);
805 const int type = npfvar_get_type(vp, 0);
806 ifnet_addr_t *ifna;
807
808 switch (type) {
809 case NPFVAR_STRING:
810 case NPFVAR_IDENTIFIER:
811 $$ = npfctl_find_ifindex(npfvar_expand_string(vp));
812 break;
813 case NPFVAR_INTERFACE:
814 ifna = npfvar_get_data(vp, type, 0);
815 $$ = ifna->ifna_index;
816 break;
817 case -1:
818 yyerror("undefined variable '%s' for interface", $1);
819 break;
820 default:
821 yyerror("wrong variable '%s' type '%s' for interface",
822 $1, npfvar_type(type));
823 break;
824 }
825 }
826 ;
827
828 number
829 : HEX { $$ = $1; }
830 | NUM { $$ = $1; }
831 ;
832
833 some_name
834 : IDENTIFIER { $$ = $1; }
835 | STRING { $$ = $1; }
836 ;
837
838 %%
839