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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 1.48 2001-01-14 04:34:51 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 #define Q_STP           26
  69
  70 /* Directional qualifiers. */
  71
  72 #define Q_SRC           1
  73 #define Q_DST           2
  74 #define Q_OR            3
  75 #define Q_AND           4
  76
  77 #define Q_DEFAULT       0
  78 #define Q_UNDEF         255
  79
  80 struct slist;
  81
  82 struct stmt {
  83         int code;
  84         struct slist *jt;       /*only for relative jump in block*/
  85         struct slist *jf;       /*only for relative jump in block*/
  86         bpf_int32 k;
  87 };
  88
  89 struct slist {
  90         struct stmt s;
  91         struct slist *next;
  92 };
  93
  94 /*
  95  * A bit vector to represent definition sets.  We assume TOT_REGISTERS
  96  * is smaller than 8*sizeof(atomset).
  97  */
  98 typedef bpf_u_int32 atomset;
  99 #define ATOMMASK(n) (1 << (n))
 100 #define ATOMELEM(d, n) (d & ATOMMASK(n))
 101
 102 /*
 103  * An unbounded set.
 104  */
 105 typedef bpf_u_int32 *uset;
 106
 107 /*
 108  * Total number of atomic entities, including accumulator (A) and index (X).
 109  * We treat all these guys similarly during flow analysis.
 110  */
 111 #define N_ATOMS (BPF_MEMWORDS+2)
 112
 113 struct edge {
 114         int id;
 115         int code;
 116         uset edom;
 117         struct block *succ;
 118         struct block *pred;
 119         struct edge *next;      /* link list of incoming edges for a node */
 120 };
 121
 122 struct block {
 123         int id;
 124         struct slist *stmts;    /* side effect stmts */
 125         struct stmt s;          /* branch stmt */
 126         int mark;
 127         int longjt;             /* jt branch requires long jump */
 128         int longjf;             /* jf branch requires long jump */
 129         int level;
 130         int offset;
 131         int sense;
 132         struct edge et;
 133         struct edge ef;
 134         struct block *head;
 135         struct block *link;     /* link field used by optimizer */
 136         uset dom;
 137         uset closure;
 138         struct edge *in_edges;
 139         atomset def, kill;
 140         atomset in_use;
 141         atomset out_use;
 142         int oval;
 143         int val[N_ATOMS];
 144 };
 145
 146 struct arth {
 147         struct block *b;        /* protocol checks */
 148         struct slist *s;        /* stmt list */
 149         int regno;              /* virtual register number of result */
 150 };
 151
 152 struct qual {
 153         unsigned char addr;
 154         unsigned char proto;
 155         unsigned char dir;
 156         unsigned char pad;
 157 };
 158
 159 struct arth *gen_loadi(int);
 160 struct arth *gen_load(int, struct arth *, int);
 161 struct arth *gen_loadlen(void);
 162 struct arth *gen_neg(struct arth *);
 163 struct arth *gen_arth(int, struct arth *, struct arth *);
 164
 165 void gen_and(struct block *, struct block *);
 166 void gen_or(struct block *, struct block *);
 167 void gen_not(struct block *);
 168
 169 struct block *gen_scode(const char *, struct qual);
 170 struct block *gen_ecode(const u_char *, struct qual);
 171 struct block *gen_mcode(const char *, const char *, int, struct qual);
 172 #ifdef INET6
 173 struct block *gen_mcode6(const char *, const char *, int, struct qual);
 174 #endif
 175 struct block *gen_ncode(const char *, bpf_u_int32, struct qual);
 176 struct block *gen_proto_abbrev(int);
 177 struct block *gen_relation(int, struct arth *, struct arth *, int);
 178 struct block *gen_less(int);
 179 struct block *gen_greater(int);
 180 struct block *gen_byteop(int, int, int);
 181 struct block *gen_broadcast(int);
 182 struct block *gen_multicast(int);
 183 struct block *gen_inbound(int);
 184
 185 struct block *gen_vlan(int);
 186
 187 void bpf_optimize(struct block **);
 188 void bpf_error(const char *, ...)
 189 #if HAVE___ATTRIBUTE__
 190     __attribute__((noreturn, format (printf, 1, 2)))
 191 #endif
 192 ;
 193
 194 void finish_parse(struct block *);
 195 char *sdup(const char *);
 196
 197 struct bpf_insn *icode_to_fcode(struct block *, int *);
 198 int pcap_parse(void);
 199 void lex_init(char *);
 200 void lex_cleanup(void);
 201 void sappend(struct slist *, struct slist *);
 202
 203 /* XXX */
 204 #define JT(b)  ((b)->et.succ)
 205 #define JF(b)  ((b)->ef.succ)
 206
 207 extern int no_optimize;