--- /dev/null
+%{
+/* From NetBSD: grammar.y,v 1.2 1995/03/06 11:38:27 mycroft Exp */
+
+/*
+ * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+#ifndef lint
+static char rcsid[] =
+ "@(#) Header: grammar.y,v 1.39 94/06/14 20:09:25 leres Exp (LBL)";
+#endif
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+
+#include <net/ppp_defs.h>
+#include "bpf_compile.h"
+#include "gencode.h"
+
+#define QSET(q, p, d, a) (q).proto = (p),\
+ (q).dir = (d),\
+ (q).addr = (a)
+
+int n_errors = 0;
+
+static struct qual qerr = { Q_UNDEF, Q_UNDEF, Q_UNDEF, Q_UNDEF };
+
+static void
+yyerror(char *msg)
+{
+ ++n_errors;
+ bpf_error(msg);
+ /* NOTREACHED */
+}
+
+#ifndef YYBISON
+int
+pcap_parse()
+{
+ extern int yyparse();
+ return (yyparse());
+}
+#endif
+
+%}
+
+%union {
+ int i;
+ unsigned long h;
+ char *s;
+ struct stmt *stmt;
+ struct arth *a;
+ struct {
+ struct qual q;
+ struct block *b;
+ } blk;
+ struct block *rblk;
+}
+
+%type <blk> expr id nid pid term rterm qid
+%type <blk> head
+%type <i> pqual dqual aqual
+%type <a> arth narth
+%type <i> byteop pname pnum relop irelop
+%type <blk> and or paren not null prog
+%type <rblk> other
+
+%token DST SRC HOST
+%token NET PORT LESS GREATER PROTO BYTE
+%token IP TCP UDP ICMP
+%token TK_BROADCAST TK_MULTICAST
+%token NUM INBOUND OUTBOUND
+%token LINK
+%token GEQ LEQ NEQ
+%token ID HID
+%token LSH RSH
+%token LEN
+
+%type <s> ID
+%type <h> HID
+%type <i> NUM
+
+%left OR AND
+%nonassoc '!'
+%left '|'
+%left '&'
+%left LSH RSH
+%left '+' '-'
+%left '*' '/'
+%nonassoc UMINUS
+%%
+prog: null expr
+{
+ finish_parse($2.b);
+}
+ | null
+ ;
+null: /* null */ { $$.q = qerr; }
+ ;
+expr: term
+ | expr and term { gen_and($1.b, $3.b); $$ = $3; }
+ | expr and id { gen_and($1.b, $3.b); $$ = $3; }
+ | expr or term { gen_or($1.b, $3.b); $$ = $3; }
+ | expr or id { gen_or($1.b, $3.b); $$ = $3; }
+ ;
+and: AND { $$ = $<blk>0; }
+ ;
+or: OR { $$ = $<blk>0; }
+ ;
+id: nid
+ | pnum { $$.b = gen_ncode((unsigned long)$1,
+ $$.q = $<blk>0.q); }
+ | paren pid ')' { $$ = $2; }
+ ;
+nid: ID { $$.b = gen_scode($1, $$.q = $<blk>0.q); }
+ | HID { $$.b = gen_ncode(__pcap_atoin((char *)$1),
+ $$.q); }
+ | not id { gen_not($2.b); $$ = $2; }
+ ;
+not: '!' { $$ = $<blk>0; }
+ ;
+paren: '(' { $$ = $<blk>0; }
+ ;
+pid: nid
+ | qid and id { gen_and($1.b, $3.b); $$ = $3; }
+ | qid or id { gen_or($1.b, $3.b); $$ = $3; }
+ ;
+qid: pnum { $$.b = gen_ncode((unsigned long)$1,
+ $$.q = $<blk>0.q); }
+ | pid
+ ;
+term: rterm
+ | not term { gen_not($2.b); $$ = $2; }
+ ;
+head: pqual dqual aqual { QSET($$.q, $1, $2, $3); }
+ | pqual dqual { QSET($$.q, $1, $2, Q_DEFAULT); }
+ | pqual aqual { QSET($$.q, $1, Q_DEFAULT, $2); }
+ | pqual PROTO { QSET($$.q, $1, Q_DEFAULT, Q_PROTO); }
+ ;
+rterm: head id { $$ = $2; }
+ | paren expr ')' { $$.b = $2.b; $$.q = $1.q; }
+ | pname { $$.b = gen_proto_abbrev($1); $$.q = qerr; }
+ | arth relop arth { $$.b = gen_relation($2, $1, $3, 0);
+ $$.q = qerr; }
+ | arth irelop arth { $$.b = gen_relation($2, $1, $3, 1);
+ $$.q = qerr; }
+ | other { $$.b = $1; $$.q = qerr; }
+ ;
+/* protocol level qualifiers */
+pqual: pname
+ | { $$ = Q_DEFAULT; }
+ ;
+/* 'direction' qualifiers */
+dqual: SRC { $$ = Q_SRC; }
+ | DST { $$ = Q_DST; }
+ | SRC OR DST { $$ = Q_OR; }
+ | DST OR SRC { $$ = Q_OR; }
+ | SRC AND DST { $$ = Q_AND; }
+ | DST AND SRC { $$ = Q_AND; }
+ ;
+/* address type qualifiers */
+aqual: HOST { $$ = Q_HOST; }
+ | NET { $$ = Q_NET; }
+ | PORT { $$ = Q_PORT; }
+ ;
+pname: LINK { $$ = Q_LINK; }
+ | IP { $$ = Q_IP; }
+ | TCP { $$ = Q_TCP; }
+ | UDP { $$ = Q_UDP; }
+ | ICMP { $$ = Q_ICMP; }
+ ;
+other: pqual TK_BROADCAST { $$ = gen_broadcast($1); }
+ | pqual TK_MULTICAST { $$ = gen_multicast($1); }
+ | LESS NUM { $$ = gen_less($2); }
+ | GREATER NUM { $$ = gen_greater($2); }
+ | BYTE NUM byteop NUM { $$ = gen_byteop($3, $2, $4); }
+ | INBOUND { $$ = gen_inbound(0); }
+ | OUTBOUND { $$ = gen_inbound(1); }
+ ;
+relop: '>' { $$ = BPF_JGT; }
+ | GEQ { $$ = BPF_JGE; }
+ | '=' { $$ = BPF_JEQ; }
+ ;
+irelop: LEQ { $$ = BPF_JGT; }
+ | '<' { $$ = BPF_JGE; }
+ | NEQ { $$ = BPF_JEQ; }
+ ;
+arth: pnum { $$ = gen_loadi($1); }
+ | narth
+ ;
+narth: pname '[' arth ']' { $$ = gen_load($1, $3, 1); }
+ | pname '[' arth ':' NUM ']' { $$ = gen_load($1, $3, $5); }
+ | arth '+' arth { $$ = gen_arth(BPF_ADD, $1, $3); }
+ | arth '-' arth { $$ = gen_arth(BPF_SUB, $1, $3); }
+ | arth '*' arth { $$ = gen_arth(BPF_MUL, $1, $3); }
+ | arth '/' arth { $$ = gen_arth(BPF_DIV, $1, $3); }
+ | arth '&' arth { $$ = gen_arth(BPF_AND, $1, $3); }
+ | arth '|' arth { $$ = gen_arth(BPF_OR, $1, $3); }
+ | arth LSH arth { $$ = gen_arth(BPF_LSH, $1, $3); }
+ | arth RSH arth { $$ = gen_arth(BPF_RSH, $1, $3); }
+ | '-' arth %prec UMINUS { $$ = gen_neg($2); }
+ | paren narth ')' { $$ = $2; }
+ | LEN { $$ = gen_loadlen(); }
+ ;
+byteop: '&' { $$ = '&'; }
+ | '|' { $$ = '|'; }
+ | '<' { $$ = '<'; }
+ | '>' { $$ = '>'; }
+ | '=' { $$ = '='; }
+ ;
+pnum: NUM
+ | paren pnum ')' { $$ = $2; }
+ ;
+%%
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