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
  22 #ifndef gencode_h
  23 #define gencode_h
  24
  25 #include "pcap/funcattrs.h"
  26 /*
  27  * pcap/bpf.h (a public header) needs u_char, u_short and u_int, which can be
  28  * made available via either pcap-types.h (a private header) or pcap/pcap.h
  29  * (a public header), none of which pcap/bpf.h includes.  Include the private
  30  * header to keep things simple, this way this private header should compile
  31  * even if included early from another file.
  32  */
  33 #include "pcap-types.h"
  34 #include "pcap/bpf.h" /* bpf_u_int32 and BPF_MEMWORDS */
  35
  36 /*
  37  * ATM support:
  38  *
  39  * Copyright (c) 1997 Yen Yen Lim and North Dakota State University
  40  * All rights reserved.
  41  *
  42  * Redistribution and use in source and binary forms, with or without
  43  * modification, are permitted provided that the following conditions
  44  * are met:
  45  * 1. Redistributions of source code must retain the above copyright
  46  *    notice, this list of conditions and the following disclaimer.
  47  * 2. Redistributions in binary form must reproduce the above copyright
  48  *    notice, this list of conditions and the following disclaimer in the
  49  *    documentation and/or other materials provided with the distribution.
  50  * 3. All advertising materials mentioning features or use of this software
  51  *    must display the following acknowledgement:
  52  *      This product includes software developed by Yen Yen Lim and
  53  *      North Dakota State University
  54  * 4. The name of the author may not be used to endorse or promote products
  55  *    derived from this software without specific prior written permission.
  56  *
  57  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  58  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  59  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  60  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  61  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  62  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  63  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  64  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  65  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  66  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  67  * POSSIBILITY OF SUCH DAMAGE.
  68  */
  69
  70 /* Address qualifiers. */
  71
  72 #define Q_HOST          1
  73 #define Q_NET           2
  74 #define Q_PORT          3
  75 #define Q_GATEWAY       4
  76 #define Q_PROTO         5
  77 #define Q_PROTOCHAIN    6
  78 #define Q_PORTRANGE     7
  79
  80 /* Protocol qualifiers. */
  81
  82 #define Q_LINK          1
  83 #define Q_IP            2
  84 #define Q_ARP           3
  85 #define Q_RARP          4
  86 #define Q_SCTP          5
  87 #define Q_TCP           6
  88 #define Q_UDP           7
  89 #define Q_ICMP          8
  90 #define Q_IGMP          9
  91 #define Q_IGRP          10
  92
  93
  94 #define Q_ATALK         11
  95 #define Q_DECNET        12
  96 #define Q_LAT           13
  97 #define Q_SCA           14
  98 #define Q_MOPRC         15
  99 #define Q_MOPDL         16
 100
 101
 102 #define Q_IPV6          17
 103 #define Q_ICMPV6        18
 104 #define Q_AH            19
 105 #define Q_ESP           20
 106
 107 #define Q_PIM           21
 108 #define Q_VRRP          22
 109
 110 #define Q_AARP          23
 111
 112 #define Q_ISO           24
 113 #define Q_ESIS          25
 114 #define Q_ISIS          26
 115 #define Q_CLNP          27
 116
 117 #define Q_STP           28
 118
 119 #define Q_IPX           29
 120
 121 #define Q_NETBEUI       30
 122
 123 /* IS-IS Levels */
 124 #define Q_ISIS_L1       31
 125 #define Q_ISIS_L2       32
 126 /* PDU types */
 127 #define Q_ISIS_IIH      33
 128 #define Q_ISIS_SNP      34
 129 #define Q_ISIS_CSNP     35
 130 #define Q_ISIS_PSNP     36
 131 #define Q_ISIS_LSP      37
 132
 133 #define Q_RADIO         38
 134
 135 #define Q_CARP          39
 136
 137 /* Directional qualifiers. */
 138
 139 #define Q_SRC           1
 140 #define Q_DST           2
 141 #define Q_OR            3
 142 #define Q_AND           4
 143 #define Q_ADDR1         5
 144 #define Q_ADDR2         6
 145 #define Q_ADDR3         7
 146 #define Q_ADDR4         8
 147 #define Q_RA            9
 148 #define Q_TA            10
 149
 150 #define Q_DEFAULT       0
 151 #define Q_UNDEF         255
 152
 153 /* ATM types */
 154 #define A_METAC         22      /* Meta signalling Circuit */
 155 #define A_BCC           23      /* Broadcast Circuit */
 156 #define A_OAMF4SC       24      /* Segment OAM F4 Circuit */
 157 #define A_OAMF4EC       25      /* End-to-End OAM F4 Circuit */
 158 #define A_SC            26      /* Signalling Circuit*/
 159 #define A_ILMIC         27      /* ILMI Circuit */
 160 #define A_OAM           28      /* OAM cells : F4 only */
 161 #define A_OAMF4         29      /* OAM F4 cells: Segment + End-to-end */
 162 #define A_LANE          30      /* LANE traffic */
 163 #define A_LLC           31      /* LLC-encapsulated traffic */
 164
 165 /* Based on Q.2931 signalling protocol */
 166 #define A_SETUP         41      /* Setup message */
 167 #define A_CALLPROCEED   42      /* Call proceeding message */
 168 #define A_CONNECT       43      /* Connect message */
 169 #define A_CONNECTACK    44      /* Connect Ack message */
 170 #define A_RELEASE       45      /* Release message */
 171 #define A_RELEASE_DONE  46      /* Release message */
 172
 173 /* ATM field types */
 174 #define A_VPI           51
 175 #define A_VCI           52
 176 #define A_PROTOTYPE     53
 177 #define A_MSGTYPE       54
 178 #define A_CALLREFTYPE   55
 179
 180 #define A_CONNECTMSG    70      /* returns Q.2931 signalling messages for
 181                                    establishing and destroying switched
 182                                    virtual connection */
 183 #define A_METACONNECT   71      /* returns Q.2931 signalling messages for
 184                                    establishing and destroying predefined
 185                                    virtual circuits, such as broadcast
 186                                    circuit, oamf4 segment circuit, oamf4
 187                                    end-to-end circuits, ILMI circuits or
 188                                    connection signalling circuit. */
 189
 190 /* MTP2 types */
 191 #define M_FISU          22      /* FISU */
 192 #define M_LSSU          23      /* LSSU */
 193 #define M_MSU           24      /* MSU */
 194
 195 /* MTP2 HSL types */
 196 #define MH_FISU         25      /* FISU for HSL */
 197 #define MH_LSSU         26      /* LSSU */
 198 #define MH_MSU          27      /* MSU */
 199
 200 /* MTP3 field types */
 201 #define M_SIO           1
 202 #define M_OPC           2
 203 #define M_DPC           3
 204 #define M_SLS           4
 205
 206 /* MTP3 field types in case of MTP2 HSL */
 207 #define MH_SIO          5
 208 #define MH_OPC          6
 209 #define MH_DPC          7
 210 #define MH_SLS          8
 211
 212
 213 struct slist;
 214
 215 /*
 216  * A single statement, corresponding to an instruction in a block.
 217  */
 218 struct stmt {
 219         int code;               /* opcode */
 220         struct slist *jt;       /* only for relative jump in block */
 221         struct slist *jf;       /* only for relative jump in block */
 222         bpf_u_int32 k;          /* k field */
 223 };
 224
 225 struct slist {
 226         struct stmt s;
 227         struct slist *next;
 228 };
 229
 230 /*
 231  * A bit vector to represent definition sets.  We assume TOT_REGISTERS
 232  * is smaller than 8*sizeof(atomset).
 233  */
 234 typedef bpf_u_int32 atomset;
 235 #define ATOMMASK(n) (1 << (n))
 236 #define ATOMELEM(d, n) (d & ATOMMASK(n))
 237
 238 /*
 239  * An unbounded set.
 240  */
 241 typedef bpf_u_int32 *uset;
 242
 243 /*
 244  * Total number of atomic entities, including accumulator (A) and index (X).
 245  * We treat all these guys similarly during flow analysis.
 246  */
 247 #define N_ATOMS (BPF_MEMWORDS+2)
 248
 249 /*
 250  * Control flow graph of a program.
 251  * This corresponds to an edge in the CFG.
 252  * It's a directed graph, so an edge has a predecessor and a successor.
 253  */
 254 struct edge {
 255         u_int id;
 256         int code;               /* opcode for branch corresponding to this edge */
 257         uset edom;
 258         struct block *succ;     /* successor vertex */
 259         struct block *pred;     /* predecessor vertex */
 260         struct edge *next;      /* link list of incoming edges for a node */
 261 };
 262
 263 /*
 264  * A block is a vertex in the CFG.
 265  * It has a list of statements, with the final statement being a
 266  * branch to successor blocks.
 267  */
 268 struct block {
 269         u_int id;
 270         struct slist *stmts;    /* side effect stmts */
 271         struct stmt s;          /* branch stmt */
 272         int mark;
 273         u_int longjt;           /* jt branch requires long jump */
 274         u_int longjf;           /* jf branch requires long jump */
 275         int level;
 276         int offset;
 277         int sense;
 278         struct edge et;         /* edge corresponding to the jt branch */
 279         struct edge ef;         /* edge corresponding to the jf branch */
 280         struct block *head;
 281         struct block *link;     /* link field used by optimizer */
 282         uset dom;
 283         uset closure;
 284         struct edge *in_edges;  /* first edge in the set (linked list) of edges with this as a successor */
 285         atomset def, kill;
 286         atomset in_use;
 287         atomset out_use;
 288         int oval;               /* value ID for value tested in branch stmt */
 289         bpf_u_int32 val[N_ATOMS];
 290 };
 291
 292 /*
 293  * A value of 0 for val[i] means the value is unknown.
 294  */
 295 #define VAL_UNKNOWN     0
 296
 297 struct arth {
 298         struct block *b;        /* protocol checks */
 299         struct slist *s;        /* stmt list */
 300         int regno;              /* virtual register number of result */
 301 };
 302
 303 struct qual {
 304         unsigned char addr;
 305         unsigned char proto;
 306         unsigned char dir;
 307         unsigned char pad;
 308 };
 309
 310 struct _compiler_state;
 311
 312 typedef struct _compiler_state compiler_state_t;
 313
 314 struct arth *gen_loadi(compiler_state_t *, bpf_u_int32);
 315 struct arth *gen_load(compiler_state_t *, int, struct arth *, bpf_u_int32);
 316 struct arth *gen_loadlen(compiler_state_t *);
 317 struct arth *gen_neg(compiler_state_t *, struct arth *);
 318 struct arth *gen_arth(compiler_state_t *, int, struct arth *, struct arth *);
 319
 320 void gen_and(struct block *, struct block *);
 321 void gen_or(struct block *, struct block *);
 322 void gen_not(struct block *);
 323
 324 struct block *gen_scode(compiler_state_t *, const char *, struct qual);
 325 struct block *gen_ecode(compiler_state_t *, const char *, struct qual);
 326 struct block *gen_acode(compiler_state_t *, const char *, struct qual);
 327 struct block *gen_mcode(compiler_state_t *, const char *, const char *,
 328     bpf_u_int32, struct qual);
 329 #ifdef INET6
 330 struct block *gen_mcode6(compiler_state_t *, const char *, bpf_u_int32,
 331     struct qual);
 332 #endif
 333 struct block *gen_ncode(compiler_state_t *, const char *, bpf_u_int32,
 334     struct qual);
 335 struct block *gen_proto_abbrev(compiler_state_t *, int);
 336 struct block *gen_relation(compiler_state_t *, int, struct arth *,
 337     struct arth *, int);
 338 struct block *gen_less(compiler_state_t *, int);
 339 struct block *gen_greater(compiler_state_t *, int);
 340 struct block *gen_byteop(compiler_state_t *, int, int, bpf_u_int32);
 341 struct block *gen_broadcast(compiler_state_t *, int);
 342 struct block *gen_multicast(compiler_state_t *, int);
 343 struct block *gen_ifindex(compiler_state_t *, int);
 344 struct block *gen_inbound(compiler_state_t *, int);
 345
 346 struct block *gen_llc(compiler_state_t *);
 347 struct block *gen_llc_i(compiler_state_t *);
 348 struct block *gen_llc_s(compiler_state_t *);
 349 struct block *gen_llc_u(compiler_state_t *);
 350 struct block *gen_llc_s_subtype(compiler_state_t *, bpf_u_int32);
 351 struct block *gen_llc_u_subtype(compiler_state_t *, bpf_u_int32);
 352
 353 struct block *gen_vlan(compiler_state_t *, bpf_u_int32, int);
 354 struct block *gen_mpls(compiler_state_t *, bpf_u_int32, int);
 355
 356 struct block *gen_pppoed(compiler_state_t *);
 357 struct block *gen_pppoes(compiler_state_t *, bpf_u_int32, int);
 358
 359 struct block *gen_geneve(compiler_state_t *, bpf_u_int32, int);
 360 struct block *gen_vxlan(compiler_state_t *, bpf_u_int32, int);
 361
 362 struct block *gen_atmfield_code(compiler_state_t *, int, bpf_u_int32,
 363     int, int);
 364 struct block *gen_atmtype_abbrev(compiler_state_t *, int);
 365 struct block *gen_atmmulti_abbrev(compiler_state_t *, int);
 366
 367 struct block *gen_mtp2type_abbrev(compiler_state_t *, int);
 368 struct block *gen_mtp3field_code(compiler_state_t *, int, bpf_u_int32,
 369     int, int);
 370
 371 struct block *gen_pf_ifname(compiler_state_t *, const char *);
 372 struct block *gen_pf_rnr(compiler_state_t *, int);
 373 struct block *gen_pf_srnr(compiler_state_t *, int);
 374 struct block *gen_pf_ruleset(compiler_state_t *, char *);
 375 struct block *gen_pf_reason(compiler_state_t *, int);
 376 struct block *gen_pf_action(compiler_state_t *, int);
 377
 378 struct block *gen_p80211_type(compiler_state_t *, bpf_u_int32, bpf_u_int32);
 379 struct block *gen_p80211_fcdir(compiler_state_t *, bpf_u_int32);
 380
 381 /*
 382  * Representation of a program as a tree of blocks, plus current mark.
 383  * A block is marked if only if its mark equals the current mark.
 384  * Rather than traverse the code array, marking each item, 'cur_mark'
 385  * is incremented.  This automatically makes each element unmarked.
 386  */
 387 #define isMarked(icp, p) ((p)->mark == (icp)->cur_mark)
 388 #define unMarkAll(icp) (icp)->cur_mark += 1
 389 #define Mark(icp, p) ((p)->mark = (icp)->cur_mark)
 390
 391 struct icode {
 392         struct block *root;
 393         int cur_mark;
 394 };
 395
 396 int bpf_optimize(struct icode *, char *);
 397 void bpf_set_error(compiler_state_t *, const char *, ...)
 398     PCAP_PRINTFLIKE(2, 3);
 399
 400 int finish_parse(compiler_state_t *, struct block *);
 401 char *sdup(compiler_state_t *, const char *);
 402
 403 struct bpf_insn *icode_to_fcode(struct icode *, struct block *, u_int *,
 404     char *);
 405 void sappend(struct slist *, struct slist *);
 406
 407 /*
 408  * Older versions of Bison don't put this declaration in
 409  * grammar.h.
 410  */
 411 int pcap_parse(void *, compiler_state_t *);
 412
 413 /* XXX */
 414 #define JT(b)  ((b)->et.succ)
 415 #define JF(b)  ((b)->ef.succ)
 416
 417 #endif /* gencode_h */