语法问题，紧急求助

[njtlxm]

在winpcap的libpcap的grammer文件中有这么一段：
/* '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 { $$ = Q_PORT; }
;
/* non-directional address type qualifiers */
ndaqual: GATEWAY { $$ = Q_GATEWAY; }
;
pname: LINK { $$ = Q_LINK; }
| IP { $$ = Q_IP; }
| ARP { $$ = Q_ARP; }
| RARP { $$ = Q_RARP; }
| TCP { $$ = Q_TCP; }
| UDP { $$ = Q_UDP; }
| ICMP { $$ = Q_ICMP; }
| IGMP { $$ = Q_IGMP; }
| IGRP { $$ = Q_IGRP; }
| PIM { $$ = Q_PIM; }
| ATALK { $$ = Q_ATALK; }
| DECNET { $$ = Q_DECNET; }
| LAT { $$ = Q_LAT; }
| SCA { $$ = Q_SCA; }
| MOPDL { $$ = Q_MOPDL; }
| MOPRC { $$ = Q_MOPRC; }
| IPV6 { $$ = Q_IPV6; }
| ICMPV6 { $$ = Q_ICMPV6; }
| AH { $$ = Q_AH; }
| ESP { $$ = Q_ESP; }
;
other: pqual TK_BROADCAST { $$ = gen_broadcast($1); }
| pqual TK_MULTICAST { $$ = gen_multicast($1); }
| LESS NUM { $$ = gen_less($2); }
| GREATER NUM { $$ = gen_greater($2); }
| CBYTE 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; }
;
%%
是指输入filter字符串的格式（具体可以用windump －d来试验），大多数我已经试验成功了，但是不知道如何指定一个ip地址范围？好像inbound后面跟ip地址不行啊