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   1 /*
   2  * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * @(#) $Header: /tcpdump/master/libpcap/gencode.h,v 1.47 2000-11-04 10:09:55 guy Exp $ (LBL)
  22  */
  23
  24 /* Address qualifiers. */
  25
  26 #define Q_HOST          1
  27 #define Q_NET           2
  28 #define Q_PORT          3
  29 #define Q_GATEWAY       4
  30 #define Q_PROTO         5
  31 #define Q_PROTOCHAIN    6
  32
  33 /* Protocol qualifiers. */
  34
  35 #define Q_LINK          1
  36 #define Q_IP            2
  37 #define Q_ARP           3
  38 #define Q_RARP          4
  39 #define Q_TCP           5
  40 #define Q_UDP           6
  41 #define Q_ICMP          7
  42 #define Q_IGMP          8
  43 #define Q_IGRP          9
  44
  45
  46 #define Q_ATALK         10
  47 #define Q_DECNET        11
  48 #define Q_LAT           12
  49 #define Q_SCA           13
  50 #define Q_MOPRC         14
  51 #define Q_MOPDL         15
  52
  53
  54 #define Q_IPV6          16
  55 #define Q_ICMPV6        17
  56 #define Q_AH            18
  57 #define Q_ESP           19
  58
  59 #define Q_PIM           20
  60
  61 #define Q_AARP          21
  62
  63 #define Q_ISO           22
  64 #define Q_ESIS          23
  65 #define Q_ISIS          24
  66 #define Q_CLNP          25
  67
  68 /* Directional qualifiers. */
  69
  70 #define Q_SRC           1
  71 #define Q_DST           2
  72 #define Q_OR            3
  73 #define Q_AND           4
  74
  75 #define Q_DEFAULT       0
  76 #define Q_UNDEF         255
  77
  78 struct slist;
  79
  80 struct stmt {
  81         int code;
  82         struct slist *jt;       /*only for relative jump in block*/
  83         struct slist *jf;       /*only for relative jump in block*/
  84         bpf_int32 k;
  85 };
  86
  87 struct slist {
  88         struct stmt s;
  89         struct slist *next;
  90 };
  91
  92 /*
  93  * A bit vector to represent definition sets.  We assume TOT_REGISTERS
  94  * is smaller than 8*sizeof(atomset).
  95  */
  96 typedef bpf_u_int32 atomset;
  97 #define ATOMMASK(n) (1 << (n))
  98 #define ATOMELEM(d, n) (d & ATOMMASK(n))
  99
 100 /*
 101  * An unbounded set.
 102  */
 103 typedef bpf_u_int32 *uset;
 104
 105 /*
 106  * Total number of atomic entities, including accumulator (A) and index (X).
 107  * We treat all these guys similarly during flow analysis.
 108  */
 109 #define N_ATOMS (BPF_MEMWORDS+2)
 110
 111 struct edge {
 112         int id;
 113         int code;
 114         uset edom;
 115         struct block *succ;
 116         struct block *pred;
 117         struct edge *next;      /* link list of incoming edges for a node */
 118 };
 119
 120 struct block {
 121         int id;
 122         struct slist *stmts;    /* side effect stmts */
 123         struct stmt s;          /* branch stmt */
 124         int mark;
 125         int longjt;             /* jt branch requires long jump */
 126         int longjf;             /* jf branch requires long jump */
 127         int level;
 128         int offset;
 129         int sense;
 130         struct edge et;
 131         struct edge ef;
 132         struct block *head;
 133         struct block *link;     /* link field used by optimizer */
 134         uset dom;
 135         uset closure;
 136         struct edge *in_edges;
 137         atomset def, kill;
 138         atomset in_use;
 139         atomset out_use;
 140         int oval;
 141         int val[N_ATOMS];
 142 };
 143
 144 struct arth {
 145         struct block *b;        /* protocol checks */
 146         struct slist *s;        /* stmt list */
 147         int regno;              /* virtual register number of result */
 148 };
 149
 150 struct qual {
 151         unsigned char addr;
 152         unsigned char proto;
 153         unsigned char dir;
 154         unsigned char pad;
 155 };
 156
 157 struct arth *gen_loadi(int);
 158 struct arth *gen_load(int, struct arth *, int);
 159 struct arth *gen_loadlen(void);
 160 struct arth *gen_neg(struct arth *);
 161 struct arth *gen_arth(int, struct arth *, struct arth *);
 162
 163 void gen_and(struct block *, struct block *);
 164 void gen_or(struct block *, struct block *);
 165 void gen_not(struct block *);
 166
 167 struct block *gen_scode(const char *, struct qual);
 168 struct block *gen_ecode(const u_char *, struct qual);
 169 struct block *gen_mcode(const char *, const char *, int, struct qual);
 170 #ifdef INET6
 171 struct block *gen_mcode6(const char *, const char *, int, struct qual);
 172 #endif
 173 struct block *gen_ncode(const char *, bpf_u_int32, struct qual);
 174 struct block *gen_proto_abbrev(int);
 175 struct block *gen_relation(int, struct arth *, struct arth *, int);
 176 struct block *gen_less(int);
 177 struct block *gen_greater(int);
 178 struct block *gen_byteop(int, int, int);
 179 struct block *gen_broadcast(int);
 180 struct block *gen_multicast(int);
 181 struct block *gen_inbound(int);
 182
 183 struct block *gen_vlan(int);
 184
 185 void bpf_optimize(struct block **);
 186 void bpf_error(const char *, ...)
 187 #if HAVE___ATTRIBUTE__
 188     __attribute__((noreturn, format (printf, 1, 2)))
 189 #endif
 190 ;
 191
 192 void finish_parse(struct block *);
 193 char *sdup(const char *);
 194
 195 struct bpf_insn *icode_to_fcode(struct block *, int *);
 196 int pcap_parse(void);
 197 void lex_init(char *);
 198 void lex_cleanup(void);
 199 void sappend(struct slist *, struct slist *);
 200
 201 /* XXX */
 202 #define JT(b)  ((b)->et.succ)
 203 #define JF(b)  ((b)->ef.succ)
 204
 205 extern int no_optimize;