The Tcpdump Group git mirrors - libpcap/blob - gencode.h

   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 1.53 2001-05-10 14:48:02 fenner 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_SCTP          5
  40 #define Q_TCP           6
  41 #define Q_UDP           7
  42 #define Q_ICMP          8
  43 #define Q_IGMP          9
  44 #define Q_IGRP          10
  45
  46
  47 #define Q_ATALK         11
  48 #define Q_DECNET        12
  49 #define Q_LAT           13
  50 #define Q_SCA           14
  51 #define Q_MOPRC         15
  52 #define Q_MOPDL         16
  53
  54
  55 #define Q_IPV6          17
  56 #define Q_ICMPV6        18
  57 #define Q_AH            19
  58 #define Q_ESP           20
  59
  60 #define Q_PIM           21
  61 #define Q_VRRP          22
  62
  63 #define Q_AARP          23
  64
  65 #define Q_ISO           24
  66 #define Q_ESIS          25
  67 #define Q_ISIS          26
  68 #define Q_CLNP          27
  69
  70 #define Q_STP           28
  71
  72 #define Q_IPX           29
  73
  74 #define Q_NETBEUI       30
  75
  76 /* Directional qualifiers. */
  77
  78 #define Q_SRC           1
  79 #define Q_DST           2
  80 #define Q_OR            3
  81 #define Q_AND           4
  82
  83 #define Q_DEFAULT       0
  84 #define Q_UNDEF         255
  85
  86 struct slist;
  87
  88 struct stmt {
  89         int code;
  90         struct slist *jt;       /*only for relative jump in block*/
  91         struct slist *jf;       /*only for relative jump in block*/
  92         bpf_int32 k;
  93 };
  94
  95 struct slist {
  96         struct stmt s;
  97         struct slist *next;
  98 };
  99
 100 /*
 101  * A bit vector to represent definition sets.  We assume TOT_REGISTERS
 102  * is smaller than 8*sizeof(atomset).
 103  */
 104 typedef bpf_u_int32 atomset;
 105 #define ATOMMASK(n) (1 << (n))
 106 #define ATOMELEM(d, n) (d & ATOMMASK(n))
 107
 108 /*
 109  * An unbounded set.
 110  */
 111 typedef bpf_u_int32 *uset;
 112
 113 /*
 114  * Total number of atomic entities, including accumulator (A) and index (X).
 115  * We treat all these guys similarly during flow analysis.
 116  */
 117 #define N_ATOMS (BPF_MEMWORDS+2)
 118
 119 struct edge {
 120         int id;
 121         int code;
 122         uset edom;
 123         struct block *succ;
 124         struct block *pred;
 125         struct edge *next;      /* link list of incoming edges for a node */
 126 };
 127
 128 struct block {
 129         int id;
 130         struct slist *stmts;    /* side effect stmts */
 131         struct stmt s;          /* branch stmt */
 132         int mark;
 133         int longjt;             /* jt branch requires long jump */
 134         int longjf;             /* jf branch requires long jump */
 135         int level;
 136         int offset;
 137         int sense;
 138         struct edge et;
 139         struct edge ef;
 140         struct block *head;
 141         struct block *link;     /* link field used by optimizer */
 142         uset dom;
 143         uset closure;
 144         struct edge *in_edges;
 145         atomset def, kill;
 146         atomset in_use;
 147         atomset out_use;
 148         int oval;
 149         int val[N_ATOMS];
 150 };
 151
 152 struct arth {
 153         struct block *b;        /* protocol checks */
 154         struct slist *s;        /* stmt list */
 155         int regno;              /* virtual register number of result */
 156 };
 157
 158 struct qual {
 159         unsigned char addr;
 160         unsigned char proto;
 161         unsigned char dir;
 162         unsigned char pad;
 163 };
 164
 165 struct arth *gen_loadi(int);
 166 struct arth *gen_load(int, struct arth *, int);
 167 struct arth *gen_loadlen(void);
 168 struct arth *gen_neg(struct arth *);
 169 struct arth *gen_arth(int, struct arth *, struct arth *);
 170
 171 void gen_and(struct block *, struct block *);
 172 void gen_or(struct block *, struct block *);
 173 void gen_not(struct block *);
 174
 175 struct block *gen_scode(const char *, struct qual);
 176 struct block *gen_ecode(const u_char *, struct qual);
 177 struct block *gen_acode(const u_char *, struct qual);
 178 struct block *gen_mcode(const char *, const char *, int, struct qual);
 179 #ifdef INET6
 180 struct block *gen_mcode6(const char *, const char *, int, struct qual);
 181 #endif
 182 struct block *gen_ncode(const char *, bpf_u_int32, struct qual);
 183 struct block *gen_proto_abbrev(int);
 184 struct block *gen_relation(int, struct arth *, struct arth *, int);
 185 struct block *gen_less(int);
 186 struct block *gen_greater(int);
 187 struct block *gen_byteop(int, int, int);
 188 struct block *gen_broadcast(int);
 189 struct block *gen_multicast(int);
 190 struct block *gen_inbound(int);
 191
 192 struct block *gen_vlan(int);
 193
 194 void bpf_optimize(struct block **);
 195 void bpf_error(const char *, ...)
 196 #if HAVE___ATTRIBUTE__
 197     __attribute__((noreturn, format (printf, 1, 2)))
 198 #endif
 199 ;
 200
 201 void finish_parse(struct block *);
 202 char *sdup(const char *);
 203
 204 struct bpf_insn *icode_to_fcode(struct block *, int *);
 205 int pcap_parse(void);
 206 void lex_init(char *);
 207 void lex_cleanup(void);
 208 void sappend(struct slist *, struct slist *);
 209
 210 /* XXX */
 211 #define JT(b)  ((b)->et.succ)
 212 #define JF(b)  ((b)->ef.succ)
 213
 214 extern int no_optimize;