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 1.55 2002-07-11 09:06:34 guy Exp $ (LBL)
  22  */
  23
  24 /*
  25  * ATM support:
  26  *
  27  * Copyright (c) 1997 Yen Yen Lim and North Dakota State University
  28  * All rights reserved.
  29  *
  30  * Redistribution and use in source and binary forms, with or without
  31  * modification, are permitted provided that the following conditions
  32  * are met:
  33  * 1. Redistributions of source code must retain the above copyright
  34  *    notice, this list of conditions and the following disclaimer.
  35  * 2. Redistributions in binary form must reproduce the above copyright
  36  *    notice, this list of conditions and the following disclaimer in the
  37  *    documentation and/or other materials provided with the distribution.
  38  * 3. All advertising materials mentioning features or use of this software
  39  *    must display the following acknowledgement:
  40  *      This product includes software developed by Yen Yen Lim and
  41  *      North Dakota State University
  42  * 4. The name of the author may not be used to endorse or promote products
  43  *    derived from this software without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  46  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  47  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  48  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  49  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  50  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  51  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  53  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  54  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  55  * POSSIBILITY OF SUCH DAMAGE.
  56  */
  57
  58 /* Address qualifiers. */
  59
  60 #define Q_HOST          1
  61 #define Q_NET           2
  62 #define Q_PORT          3
  63 #define Q_GATEWAY       4
  64 #define Q_PROTO         5
  65 #define Q_PROTOCHAIN    6
  66
  67 /* Protocol qualifiers. */
  68
  69 #define Q_LINK          1
  70 #define Q_IP            2
  71 #define Q_ARP           3
  72 #define Q_RARP          4
  73 #define Q_SCTP          5
  74 #define Q_TCP           6
  75 #define Q_UDP           7
  76 #define Q_ICMP          8
  77 #define Q_IGMP          9
  78 #define Q_IGRP          10
  79
  80
  81 #define Q_ATALK         11
  82 #define Q_DECNET        12
  83 #define Q_LAT           13
  84 #define Q_SCA           14
  85 #define Q_MOPRC         15
  86 #define Q_MOPDL         16
  87
  88
  89 #define Q_IPV6          17
  90 #define Q_ICMPV6        18
  91 #define Q_AH            19
  92 #define Q_ESP           20
  93
  94 #define Q_PIM           21
  95 #define Q_VRRP          22
  96
  97 #define Q_AARP          23
  98
  99 #define Q_ISO           24
 100 #define Q_ESIS          25
 101 #define Q_ISIS          26
 102 #define Q_CLNP          27
 103
 104 #define Q_STP           28
 105
 106 #define Q_IPX           29
 107
 108 #define Q_NETBEUI       30
 109
 110 /* Directional qualifiers. */
 111
 112 #define Q_SRC           1
 113 #define Q_DST           2
 114 #define Q_OR            3
 115 #define Q_AND           4
 116
 117 #define Q_DEFAULT       0
 118 #define Q_UNDEF         255
 119
 120 /* ATM types */
 121 #define A_METAC         22      /* Meta signalling Circuit */
 122 #define A_BCC           23      /* Broadcast Circuit */
 123 #define A_OAMF4SC       24      /* Segment OAM F4 Circuit */
 124 #define A_OAMF4EC       25      /* End-to-End OAM F4 Circuit */
 125 #define A_SC            26      /* Signalling Circuit*/
 126 #define A_ILMIC         27      /* ILMI Circuit */
 127 #define A_OAM           28      /* OAM cells : F4 only */
 128 #define A_OAMF4         29      /* OAM F4 cells: Segment + End-to-end */
 129 #define A_LANE          30      /* LANE traffic */
 130 #define A_LLC           31      /* LLC-encapsulated traffic */
 131
 132 /* Based on Q.2931 signalling protocol */
 133 #define A_SETUP         41      /* Setup message */
 134 #define A_CALLPROCEED   42      /* Call proceeding message */
 135 #define A_CONNECT       43      /* Connect message */
 136 #define A_CONNECTACK    44      /* Connect Ack message */
 137 #define A_RELEASE       45      /* Release message */
 138 #define A_RELEASE_DONE  46      /* Release message */
 139
 140 /* ATM field types */
 141 #define A_VPI           51
 142 #define A_VCI           52
 143 #define A_PROTOTYPE     53
 144 #define A_MSGTYPE       54
 145 #define A_CALLREFTYPE   55
 146
 147 #define A_CONNECTMSG    70      /* returns Q.2931 signalling messages for
 148                                    establishing and destroying switched
 149                                    virtual connection */
 150 #define A_METACONNECT   71      /* returns Q.2931 signalling messages for
 151                                    establishing and destroying predefined
 152                                    virtual circuits, such as broadcast
 153                                    circuit, oamf4 segment circuit, oamf4
 154                                    end-to-end circuits, ILMI circuits or
 155                                    connection signalling circuit. */
 156
 157 struct slist;
 158
 159 struct stmt {
 160         int code;
 161         struct slist *jt;       /*only for relative jump in block*/
 162         struct slist *jf;       /*only for relative jump in block*/
 163         bpf_int32 k;
 164 };
 165
 166 struct slist {
 167         struct stmt s;
 168         struct slist *next;
 169 };
 170
 171 /*
 172  * A bit vector to represent definition sets.  We assume TOT_REGISTERS
 173  * is smaller than 8*sizeof(atomset).
 174  */
 175 typedef bpf_u_int32 atomset;
 176 #define ATOMMASK(n) (1 << (n))
 177 #define ATOMELEM(d, n) (d & ATOMMASK(n))
 178
 179 /*
 180  * An unbounded set.
 181  */
 182 typedef bpf_u_int32 *uset;
 183
 184 /*
 185  * Total number of atomic entities, including accumulator (A) and index (X).
 186  * We treat all these guys similarly during flow analysis.
 187  */
 188 #define N_ATOMS (BPF_MEMWORDS+2)
 189
 190 struct edge {
 191         int id;
 192         int code;
 193         uset edom;
 194         struct block *succ;
 195         struct block *pred;
 196         struct edge *next;      /* link list of incoming edges for a node */
 197 };
 198
 199 struct block {
 200         int id;
 201         struct slist *stmts;    /* side effect stmts */
 202         struct stmt s;          /* branch stmt */
 203         int mark;
 204         int longjt;             /* jt branch requires long jump */
 205         int longjf;             /* jf branch requires long jump */
 206         int level;
 207         int offset;
 208         int sense;
 209         struct edge et;
 210         struct edge ef;
 211         struct block *head;
 212         struct block *link;     /* link field used by optimizer */
 213         uset dom;
 214         uset closure;
 215         struct edge *in_edges;
 216         atomset def, kill;
 217         atomset in_use;
 218         atomset out_use;
 219         int oval;
 220         int val[N_ATOMS];
 221 };
 222
 223 struct arth {
 224         struct block *b;        /* protocol checks */
 225         struct slist *s;        /* stmt list */
 226         int regno;              /* virtual register number of result */
 227 };
 228
 229 struct qual {
 230         unsigned char addr;
 231         unsigned char proto;
 232         unsigned char dir;
 233         unsigned char pad;
 234 };
 235
 236 struct arth *gen_loadi(int);
 237 struct arth *gen_load(int, struct arth *, int);
 238 struct arth *gen_loadlen(void);
 239 struct arth *gen_neg(struct arth *);
 240 struct arth *gen_arth(int, struct arth *, struct arth *);
 241
 242 void gen_and(struct block *, struct block *);
 243 void gen_or(struct block *, struct block *);
 244 void gen_not(struct block *);
 245
 246 struct block *gen_scode(const char *, struct qual);
 247 struct block *gen_ecode(const u_char *, struct qual);
 248 struct block *gen_acode(const u_char *, struct qual);
 249 struct block *gen_mcode(const char *, const char *, int, struct qual);
 250 #ifdef INET6
 251 struct block *gen_mcode6(const char *, const char *, int, struct qual);
 252 #endif
 253 struct block *gen_ncode(const char *, bpf_u_int32, struct qual);
 254 struct block *gen_proto_abbrev(int);
 255 struct block *gen_relation(int, struct arth *, struct arth *, int);
 256 struct block *gen_less(int);
 257 struct block *gen_greater(int);
 258 struct block *gen_byteop(int, int, int);
 259 struct block *gen_broadcast(int);
 260 struct block *gen_multicast(int);
 261 struct block *gen_inbound(int);
 262
 263 struct block *gen_vlan(int);
 264
 265 struct block *gen_atmfield_code(int atmfield, bpf_u_int32 jvalue, bpf_u_int32 jtype, int reverse);
 266 struct block *gen_atmtype_abbrev(int type);
 267 struct block *gen_atmmulti_abbrev(int type);
 268
 269 void bpf_optimize(struct block **);
 270 void bpf_error(const char *, ...)
 271 #if HAVE___ATTRIBUTE__
 272     __attribute__((noreturn, format (printf, 1, 2)))
 273 #endif
 274 ;
 275
 276 void finish_parse(struct block *);
 277 char *sdup(const char *);
 278
 279 struct bpf_insn *icode_to_fcode(struct block *, int *);
 280 int pcap_parse(void);
 281 void lex_init(char *);
 282 void lex_cleanup(void);
 283 void sappend(struct slist *, struct slist *);
 284
 285 /* XXX */
 286 #define JT(b)  ((b)->et.succ)
 287 #define JF(b)  ((b)->ef.succ)
 288
 289 extern int no_optimize;