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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
  22 #include "pcap/funcattrs.h"
  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 #include <setjmp.h>
  59
  60 /* Address qualifiers. */
  61
  62 #define Q_HOST          1
  63 #define Q_NET           2
  64 #define Q_PORT          3
  65 #define Q_GATEWAY       4
  66 #define Q_PROTO         5
  67 #define Q_PROTOCHAIN    6
  68 #define Q_PORTRANGE     7
  69
  70 /* Protocol qualifiers. */
  71
  72 #define Q_LINK          1
  73 #define Q_IP            2
  74 #define Q_ARP           3
  75 #define Q_RARP          4
  76 #define Q_SCTP          5
  77 #define Q_TCP           6
  78 #define Q_UDP           7
  79 #define Q_ICMP          8
  80 #define Q_IGMP          9
  81 #define Q_IGRP          10
  82
  83
  84 #define Q_ATALK         11
  85 #define Q_DECNET        12
  86 #define Q_LAT           13
  87 #define Q_SCA           14
  88 #define Q_MOPRC         15
  89 #define Q_MOPDL         16
  90
  91
  92 #define Q_IPV6          17
  93 #define Q_ICMPV6        18
  94 #define Q_AH            19
  95 #define Q_ESP           20
  96
  97 #define Q_PIM           21
  98 #define Q_VRRP          22
  99
 100 #define Q_AARP          23
 101
 102 #define Q_ISO           24
 103 #define Q_ESIS          25
 104 #define Q_ISIS          26
 105 #define Q_CLNP          27
 106
 107 #define Q_STP           28
 108
 109 #define Q_IPX           29
 110
 111 #define Q_NETBEUI       30
 112
 113 /* IS-IS Levels */
 114 #define Q_ISIS_L1       31
 115 #define Q_ISIS_L2       32
 116 /* PDU types */
 117 #define Q_ISIS_IIH      33
 118 #define Q_ISIS_SNP      34
 119 #define Q_ISIS_CSNP     35
 120 #define Q_ISIS_PSNP     36
 121 #define Q_ISIS_LSP      37
 122
 123 #define Q_RADIO         38
 124
 125 #define Q_CARP          39
 126
 127 /* Directional qualifiers. */
 128
 129 #define Q_SRC           1
 130 #define Q_DST           2
 131 #define Q_OR            3
 132 #define Q_AND           4
 133 #define Q_ADDR1         5
 134 #define Q_ADDR2         6
 135 #define Q_ADDR3         7
 136 #define Q_ADDR4         8
 137 #define Q_RA            9
 138 #define Q_TA            10
 139
 140 #define Q_DEFAULT       0
 141 #define Q_UNDEF         255
 142
 143 /* ATM types */
 144 #define A_METAC         22      /* Meta signalling Circuit */
 145 #define A_BCC           23      /* Broadcast Circuit */
 146 #define A_OAMF4SC       24      /* Segment OAM F4 Circuit */
 147 #define A_OAMF4EC       25      /* End-to-End OAM F4 Circuit */
 148 #define A_SC            26      /* Signalling Circuit*/
 149 #define A_ILMIC         27      /* ILMI Circuit */
 150 #define A_OAM           28      /* OAM cells : F4 only */
 151 #define A_OAMF4         29      /* OAM F4 cells: Segment + End-to-end */
 152 #define A_LANE          30      /* LANE traffic */
 153 #define A_LLC           31      /* LLC-encapsulated traffic */
 154
 155 /* Based on Q.2931 signalling protocol */
 156 #define A_SETUP         41      /* Setup message */
 157 #define A_CALLPROCEED   42      /* Call proceeding message */
 158 #define A_CONNECT       43      /* Connect message */
 159 #define A_CONNECTACK    44      /* Connect Ack message */
 160 #define A_RELEASE       45      /* Release message */
 161 #define A_RELEASE_DONE  46      /* Release message */
 162
 163 /* ATM field types */
 164 #define A_VPI           51
 165 #define A_VCI           52
 166 #define A_PROTOTYPE     53
 167 #define A_MSGTYPE       54
 168 #define A_CALLREFTYPE   55
 169
 170 #define A_CONNECTMSG    70      /* returns Q.2931 signalling messages for
 171                                    establishing and destroying switched
 172                                    virtual connection */
 173 #define A_METACONNECT   71      /* returns Q.2931 signalling messages for
 174                                    establishing and destroying predefined
 175                                    virtual circuits, such as broadcast
 176                                    circuit, oamf4 segment circuit, oamf4
 177                                    end-to-end circuits, ILMI circuits or
 178                                    connection signalling circuit. */
 179
 180 /* MTP2 types */
 181 #define M_FISU          22      /* FISU */
 182 #define M_LSSU          23      /* LSSU */
 183 #define M_MSU           24      /* MSU */
 184
 185 /* MTP2 HSL types */
 186 #define MH_FISU         25      /* FISU for HSL */
 187 #define MH_LSSU         26      /* LSSU */
 188 #define MH_MSU          27      /* MSU */
 189
 190 /* MTP3 field types */
 191 #define M_SIO           1
 192 #define M_OPC           2
 193 #define M_DPC           3
 194 #define M_SLS           4
 195
 196 /* MTP3 field types in case of MTP2 HSL */
 197 #define MH_SIO          5
 198 #define MH_OPC          6
 199 #define MH_DPC          7
 200 #define MH_SLS          8
 201
 202
 203 struct slist;
 204
 205 struct stmt {
 206         int code;
 207         struct slist *jt;       /*only for relative jump in block*/
 208         struct slist *jf;       /*only for relative jump in block*/
 209         bpf_int32 k;
 210 };
 211
 212 struct slist {
 213         struct stmt s;
 214         struct slist *next;
 215 };
 216
 217 /*
 218  * A bit vector to represent definition sets.  We assume TOT_REGISTERS
 219  * is smaller than 8*sizeof(atomset).
 220  */
 221 typedef bpf_u_int32 atomset;
 222 #define ATOMMASK(n) (1 << (n))
 223 #define ATOMELEM(d, n) (d & ATOMMASK(n))
 224
 225 /*
 226  * An unbounded set.
 227  */
 228 typedef bpf_u_int32 *uset;
 229
 230 /*
 231  * Total number of atomic entities, including accumulator (A) and index (X).
 232  * We treat all these guys similarly during flow analysis.
 233  */
 234 #define N_ATOMS (BPF_MEMWORDS+2)
 235
 236 struct edge {
 237         int id;
 238         int code;
 239         uset edom;
 240         struct block *succ;
 241         struct block *pred;
 242         struct edge *next;      /* link list of incoming edges for a node */
 243 };
 244
 245 struct block {
 246         int id;
 247         struct slist *stmts;    /* side effect stmts */
 248         struct stmt s;          /* branch stmt */
 249         int mark;
 250         u_int longjt;           /* jt branch requires long jump */
 251         u_int longjf;           /* jf branch requires long jump */
 252         int level;
 253         int offset;
 254         int sense;
 255         struct edge et;
 256         struct edge ef;
 257         struct block *head;
 258         struct block *link;     /* link field used by optimizer */
 259         uset dom;
 260         uset closure;
 261         struct edge *in_edges;
 262         atomset def, kill;
 263         atomset in_use;
 264         atomset out_use;
 265         int oval;
 266         int val[N_ATOMS];
 267 };
 268
 269 /*
 270  * A value of 0 for val[i] means the value is unknown.
 271  */
 272 #define VAL_UNKNOWN     0
 273
 274 struct arth {
 275         struct block *b;        /* protocol checks */
 276         struct slist *s;        /* stmt list */
 277         int regno;              /* virtual register number of result */
 278 };
 279
 280 struct qual {
 281         unsigned char addr;
 282         unsigned char proto;
 283         unsigned char dir;
 284         unsigned char pad;
 285 };
 286
 287 struct _codegen_state;
 288
 289 typedef struct _codegen_state codegen_state_t;
 290
 291 typedef struct {
 292         jmp_buf top_ctx;
 293         pcap_t *bpf_pcap;
 294         codegen_state_t *cgstate;
 295 } compiler_state_t;
 296
 297 struct arth *gen_loadi(compiler_state_t *, int);
 298 struct arth *gen_load(compiler_state_t *, int, struct arth *, int);
 299 struct arth *gen_loadlen(compiler_state_t *);
 300 struct arth *gen_neg(compiler_state_t *, struct arth *);
 301 struct arth *gen_arth(compiler_state_t *, int, struct arth *, struct arth *);
 302
 303 void gen_and(struct block *, struct block *);
 304 void gen_or(struct block *, struct block *);
 305 void gen_not(struct block *);
 306
 307 struct block *gen_scode(compiler_state_t *, const char *, struct qual);
 308 struct block *gen_ecode(compiler_state_t *, const char *, struct qual);
 309 struct block *gen_acode(compiler_state_t *, const char *, struct qual);
 310 struct block *gen_mcode(compiler_state_t *, const char *, const char *,
 311     unsigned int, struct qual);
 312 #ifdef INET6
 313 struct block *gen_mcode6(compiler_state_t *, const char *, const char *,
 314     unsigned int, struct qual);
 315 #endif
 316 struct block *gen_ncode(compiler_state_t *, const char *, bpf_u_int32,
 317     struct qual);
 318 struct block *gen_proto_abbrev(compiler_state_t *, int);
 319 struct block *gen_relation(compiler_state_t *, int, struct arth *,
 320     struct arth *, int);
 321 struct block *gen_less(compiler_state_t *, int);
 322 struct block *gen_greater(compiler_state_t *, int);
 323 struct block *gen_byteop(compiler_state_t *, int, int, int);
 324 struct block *gen_broadcast(compiler_state_t *, int);
 325 struct block *gen_multicast(compiler_state_t *, int);
 326 struct block *gen_inbound(compiler_state_t *, int);
 327
 328 struct block *gen_llc(compiler_state_t *);
 329 struct block *gen_llc_i(compiler_state_t *);
 330 struct block *gen_llc_s(compiler_state_t *);
 331 struct block *gen_llc_u(compiler_state_t *);
 332 struct block *gen_llc_s_subtype(compiler_state_t *, bpf_u_int32);
 333 struct block *gen_llc_u_subtype(compiler_state_t *, bpf_u_int32);
 334
 335 struct block *gen_vlan(compiler_state_t *, bpf_u_int32, int);
 336 struct block *gen_mpls(compiler_state_t *, bpf_u_int32, int);
 337
 338 struct block *gen_pppoed(compiler_state_t *);
 339 struct block *gen_pppoes(compiler_state_t *, bpf_u_int32, int);
 340
 341 struct block *gen_geneve(compiler_state_t *, bpf_u_int32, int);
 342
 343 struct block *gen_atmfield_code(compiler_state_t *, int, bpf_int32,
 344     bpf_u_int32, int);
 345 struct block *gen_atmtype_abbrev(compiler_state_t *, int type);
 346 struct block *gen_atmmulti_abbrev(compiler_state_t *, int type);
 347
 348 struct block *gen_mtp2type_abbrev(compiler_state_t *, int type);
 349 struct block *gen_mtp3field_code(compiler_state_t *, int, bpf_u_int32,
 350     bpf_u_int32, int);
 351
 352 #ifndef HAVE_NET_PFVAR_H
 353 PCAP_NORETURN
 354 #endif
 355 struct block *gen_pf_ifname(compiler_state_t *, const char *);
 356 #ifndef HAVE_NET_PFVAR_H
 357 PCAP_NORETURN
 358 #endif
 359 struct block *gen_pf_rnr(compiler_state_t *, int);
 360 #ifndef HAVE_NET_PFVAR_H
 361 PCAP_NORETURN
 362 #endif
 363 struct block *gen_pf_srnr(compiler_state_t *, int);
 364 #ifndef HAVE_NET_PFVAR_H
 365 PCAP_NORETURN
 366 #endif
 367 struct block *gen_pf_ruleset(compiler_state_t *, char *);
 368 #ifndef HAVE_NET_PFVAR_H
 369 PCAP_NORETURN
 370 #endif
 371 struct block *gen_pf_reason(compiler_state_t *, int);
 372 #ifndef HAVE_NET_PFVAR_H
 373 PCAP_NORETURN
 374 #endif
 375 struct block *gen_pf_action(compiler_state_t *, int);
 376
 377 struct block *gen_p80211_type(compiler_state_t *, int, int);
 378 struct block *gen_p80211_fcdir(compiler_state_t *, int);
 379
 380 /*
 381  * Representation of a program as a tree of blocks, plus current mark.
 382  * A block is marked if only if its mark equals the current mark.
 383  * Rather than traverse the code array, marking each item, 'cur_mark'
 384  * is incremented.  This automatically makes each element unmarked.
 385  */
 386 #define isMarked(icp, p) ((p)->mark == (icp)->cur_mark)
 387 #define unMarkAll(icp) (icp)->cur_mark += 1
 388 #define Mark(icp, p) ((p)->mark = (icp)->cur_mark)
 389
 390 struct icode {
 391         struct block *root;
 392         int cur_mark;
 393 };
 394
 395 int bpf_optimize(struct icode *, char *);
 396 void PCAP_NORETURN bpf_parser_error(compiler_state_t *, const char *);
 397 void PCAP_NORETURN bpf_error(compiler_state_t *, const char *, ...)
 398     PCAP_PRINTFLIKE(2, 3);
 399
 400 void 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)