options.h

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013-2014 Jo-Philipp Wich <jo@mein.io>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #ifndef __FW3_OPTIONS_H
  20 #define __FW3_OPTIONS_H
  21
  22
  23 #include <errno.h>
  24
  25 #include <stdlib.h>
  26 #include <stdarg.h>
  27 #include <stdbool.h>
  28
  29 #include <ctype.h>
  30 #include <string.h>
  31
  32 #include <netdb.h>
  33 #include <arpa/inet.h>
  34 #include <sys/socket.h>
  35 #define _LINUX_IN_H
  36 #define _LINUX_IN6_H
  37 #include <netinet/in.h>
  38 #include <netinet/ether.h>
  39
  40 #include <time.h>
  41
  42 #include <uci.h>
  43
  44 #include <libubox/list.h>
  45 #include <libubox/utils.h>
  46 #include <libubox/blobmsg.h>
  47
  48 #include "icmp_codes.h"
  49 #include "utils.h"
  50
  51
  52 enum fw3_table
  53 {
  54         FW3_TABLE_FILTER = 0,
  55         FW3_TABLE_NAT    = 1,
  56         FW3_TABLE_MANGLE = 2,
  57         FW3_TABLE_RAW    = 3,
  58 };
  59
  60 enum fw3_family
  61 {
  62         FW3_FAMILY_ANY = 0,
  63         FW3_FAMILY_V4  = 4,
  64         FW3_FAMILY_V6  = 5,
  65 };
  66
  67 enum fw3_flag
  68 {
  69         FW3_FLAG_UNSPEC        = 0,
  70         FW3_FLAG_ACCEPT        = 6,
  71         FW3_FLAG_REJECT        = 7,
  72         FW3_FLAG_DROP          = 8,
  73         FW3_FLAG_NOTRACK       = 9,
  74         FW3_FLAG_HELPER        = 10,
  75         FW3_FLAG_MARK          = 11,
  76         FW3_FLAG_DNAT          = 12,
  77         FW3_FLAG_SNAT          = 13,
  78         FW3_FLAG_MASQUERADE    = 14,
  79         FW3_FLAG_SRC_ACCEPT    = 15,
  80         FW3_FLAG_SRC_REJECT    = 16,
  81         FW3_FLAG_SRC_DROP      = 17,
  82         FW3_FLAG_CUSTOM_CHAINS = 18,
  83         FW3_FLAG_SYN_FLOOD     = 19,
  84         FW3_FLAG_MTU_FIX       = 20,
  85         FW3_FLAG_DROP_INVALID  = 21,
  86         FW3_FLAG_HOTPLUG       = 22,
  87
  88         __FW3_FLAG_MAX
  89 };
  90
  91 extern const char *fw3_flag_names[__FW3_FLAG_MAX];
  92
  93
  94 enum fw3_limit_unit
  95 {
  96         FW3_LIMIT_UNIT_SECOND = 0,
  97         FW3_LIMIT_UNIT_MINUTE = 1,
  98         FW3_LIMIT_UNIT_HOUR   = 2,
  99         FW3_LIMIT_UNIT_DAY    = 3,
 100
 101         __FW3_LIMIT_UNIT_MAX
 102 };
 103
 104 extern const char *fw3_limit_units[__FW3_LIMIT_UNIT_MAX];
 105
 106
 107 enum fw3_ipset_method
 108 {
 109         FW3_IPSET_METHOD_UNSPEC = 0,
 110         FW3_IPSET_METHOD_BITMAP = 1,
 111         FW3_IPSET_METHOD_HASH   = 2,
 112         FW3_IPSET_METHOD_LIST   = 3,
 113
 114         __FW3_IPSET_METHOD_MAX
 115 };
 116
 117 enum fw3_ipset_type
 118 {
 119         FW3_IPSET_TYPE_UNSPEC = 0,
 120         FW3_IPSET_TYPE_IP     = 1,
 121         FW3_IPSET_TYPE_PORT   = 2,
 122         FW3_IPSET_TYPE_MAC    = 3,
 123         FW3_IPSET_TYPE_NET    = 4,
 124         FW3_IPSET_TYPE_SET    = 5,
 125
 126         __FW3_IPSET_TYPE_MAX
 127 };
 128
 129 extern const char *fw3_ipset_method_names[__FW3_IPSET_METHOD_MAX];
 130 extern const char *fw3_ipset_type_names[__FW3_IPSET_TYPE_MAX];
 131
 132
 133 enum fw3_include_type
 134 {
 135         FW3_INC_TYPE_SCRIPT   = 0,
 136         FW3_INC_TYPE_RESTORE  = 1,
 137 };
 138
 139 enum fw3_reflection_source
 140 {
 141         FW3_REFLECTION_INTERNAL = 0,
 142         FW3_REFLECTION_EXTERNAL = 1,
 143 };
 144
 145 struct fw3_ipset_datatype
 146 {
 147         struct list_head list;
 148         enum fw3_ipset_type type;
 149         const char *dir;
 150 };
 151
 152 struct fw3_setmatch
 153 {
 154         bool set;
 155         bool invert;
 156         char name[32];
 157         const char *dir[3];
 158         struct fw3_ipset *ptr;
 159 };
 160
 161 struct fw3_device
 162 {
 163         struct list_head list;
 164
 165         bool set;
 166         bool any;
 167         bool invert;
 168         char name[32];
 169         char network[32];
 170 };
 171
 172 struct fw3_address
 173 {
 174         struct list_head list;
 175
 176         bool set;
 177         bool range;
 178         bool invert;
 179         bool resolved;
 180         enum fw3_family family;
 181         union {
 182                 struct in_addr v4;
 183                 struct in6_addr v6;
 184                 struct ether_addr mac;
 185         } address;
 186         union {
 187                 struct in_addr v4;
 188                 struct in6_addr v6;
 189                 struct ether_addr mac;
 190         } mask;
 191 };
 192
 193 struct fw3_mac
 194 {
 195         struct list_head list;
 196
 197         bool set;
 198         bool invert;
 199         struct ether_addr mac;
 200 };
 201
 202 struct fw3_protocol
 203 {
 204         struct list_head list;
 205
 206         bool any;
 207         bool invert;
 208         uint32_t protocol;
 209 };
 210
 211 struct fw3_port
 212 {
 213         struct list_head list;
 214
 215         bool set;
 216         bool invert;
 217         uint16_t port_min;
 218         uint16_t port_max;
 219 };
 220
 221 struct fw3_icmptype
 222 {
 223         struct list_head list;
 224
 225         bool invert;
 226         enum fw3_family family;
 227         uint8_t type;
 228         uint8_t code_min;
 229         uint8_t code_max;
 230         uint8_t type6;
 231         uint8_t code6_min;
 232         uint8_t code6_max;
 233 };
 234
 235 struct fw3_limit
 236 {
 237         bool invert;
 238         int rate;
 239         int burst;
 240         enum fw3_limit_unit unit;
 241 };
 242
 243 struct fw3_time
 244 {
 245         bool utc;
 246         struct tm datestart;
 247         struct tm datestop;
 248         uint32_t timestart;
 249         uint32_t timestop;
 250         uint32_t monthdays; /* bit 0 is invert + 1 .. 31 */
 251         uint8_t weekdays;   /* bit 0 is invert + 1 .. 7 */
 252 };
 253
 254 struct fw3_mark
 255 {
 256         bool set;
 257         bool invert;
 258         uint32_t mark;
 259         uint32_t mask;
 260 };
 261
 262 struct fw3_cthelpermatch
 263 {
 264         struct list_head list;
 265
 266         bool set;
 267         bool invert;
 268         char name[32];
 269         struct fw3_cthelper *ptr;
 270 };
 271
 272 struct fw3_defaults
 273 {
 274         enum fw3_flag policy_input;
 275         enum fw3_flag policy_output;
 276         enum fw3_flag policy_forward;
 277
 278         bool drop_invalid;
 279
 280         bool syn_flood;
 281         struct fw3_limit syn_flood_rate;
 282
 283         bool tcp_syncookies;
 284         int tcp_ecn;
 285         bool tcp_window_scaling;
 286
 287         bool accept_redirects;
 288         bool accept_source_route;
 289
 290         bool custom_chains;
 291         bool auto_helper;
 292         bool flow_offloading;
 293         bool flow_offloading_hw;
 294
 295         bool disable_ipv6;
 296
 297         uint32_t flags[2];
 298 };
 299
 300 struct fw3_zone
 301 {
 302         struct list_head list;
 303
 304         bool enabled;
 305         const char *name;
 306
 307         enum fw3_family family;
 308
 309         enum fw3_flag policy_input;
 310         enum fw3_flag policy_output;
 311         enum fw3_flag policy_forward;
 312
 313         struct list_head networks;
 314         struct list_head devices;
 315         struct list_head subnets;
 316
 317         const char *extra_src;
 318         const char *extra_dest;
 319
 320         bool masq;
 321         bool masq_allow_invalid;
 322         struct list_head masq_src;
 323         struct list_head masq_dest;
 324
 325         bool mtu_fix;
 326
 327         struct list_head cthelpers;
 328
 329         int log;
 330         struct fw3_limit log_limit;
 331
 332         bool custom_chains;
 333         bool auto_helper;
 334
 335         uint32_t flags[2];
 336
 337         struct list_head old_addrs;
 338 };
 339
 340 struct fw3_rule
 341 {
 342         struct list_head list;
 343
 344         bool enabled;
 345         const char *name;
 346
 347         enum fw3_family family;
 348
 349         struct fw3_zone *_src;
 350         struct fw3_zone *_dest;
 351
 352         const char *device;
 353         bool direction_out;
 354
 355         struct fw3_device src;
 356         struct fw3_device dest;
 357         struct fw3_setmatch ipset;
 358         struct fw3_cthelpermatch helper;
 359
 360         struct list_head proto;
 361
 362         struct list_head ip_src;
 363         struct list_head mac_src;
 364         struct list_head port_src;
 365
 366         struct list_head ip_dest;
 367         struct list_head port_dest;
 368
 369         struct list_head icmp_type;
 370
 371         struct fw3_limit limit;
 372         struct fw3_time time;
 373         struct fw3_mark mark;
 374
 375         enum fw3_flag target;
 376         struct fw3_mark set_mark;
 377         struct fw3_mark set_xmark;
 378         struct fw3_cthelpermatch set_helper;
 379
 380         const char *extra;
 381 };
 382
 383 struct fw3_redirect
 384 {
 385         struct list_head list;
 386
 387         bool enabled;
 388         const char *name;
 389
 390         enum fw3_family family;
 391
 392         struct fw3_zone *_src;
 393         struct fw3_zone *_dest;
 394
 395         struct fw3_device src;
 396         struct fw3_device dest;
 397         struct fw3_setmatch ipset;
 398         struct fw3_cthelpermatch helper;
 399
 400         struct list_head proto;
 401
 402         struct fw3_address ip_src;
 403         struct list_head mac_src;
 404         struct fw3_port port_src;
 405
 406         struct fw3_address ip_dest;
 407         struct fw3_port port_dest;
 408
 409         struct fw3_address ip_redir;
 410         struct fw3_port port_redir;
 411
 412         struct fw3_limit limit;
 413         struct fw3_time time;
 414         struct fw3_mark mark;
 415
 416         enum fw3_flag target;
 417
 418         const char *extra;
 419
 420         bool local;
 421         bool reflection;
 422         enum fw3_reflection_source reflection_src;
 423 };
 424
 425 struct fw3_snat
 426 {
 427         struct list_head list;
 428
 429         bool enabled;
 430         const char *name;
 431
 432         enum fw3_family family;
 433
 434         struct fw3_zone *_src;
 435
 436         struct fw3_device src;
 437         struct fw3_setmatch ipset;
 438         struct fw3_cthelpermatch helper;
 439         const char *device;
 440
 441         struct list_head proto;
 442
 443         struct fw3_address ip_src;
 444         struct fw3_port port_src;
 445
 446         struct fw3_address ip_dest;
 447         struct fw3_port port_dest;
 448
 449         struct fw3_address ip_snat;
 450         struct fw3_port port_snat;
 451
 452         struct fw3_limit limit;
 453         struct fw3_time time;
 454         struct fw3_mark mark;
 455         bool connlimit_ports;
 456
 457         enum fw3_flag target;
 458
 459         const char *extra;
 460 };
 461
 462 struct fw3_forward
 463 {
 464         struct list_head list;
 465
 466         bool enabled;
 467         const char *name;
 468
 469         enum fw3_family family;
 470
 471         struct fw3_zone *_src;
 472         struct fw3_zone *_dest;
 473
 474         struct fw3_device src;
 475         struct fw3_device dest;
 476 };
 477
 478 struct fw3_ipset
 479 {
 480         struct list_head list;
 481
 482         bool enabled;
 483         const char *name;
 484         enum fw3_family family;
 485
 486         enum fw3_ipset_method method;
 487         struct list_head datatypes;
 488
 489         struct fw3_address iprange;
 490         struct fw3_port portrange;
 491
 492         int netmask;
 493         int maxelem;
 494         int hashsize;
 495
 496         int timeout;
 497
 498         const char *external;
 499
 500         struct list_head entries;
 501         const char *loadfile;
 502
 503         uint32_t flags[2];
 504 };
 505
 506 struct fw3_include
 507 {
 508         struct list_head list;
 509
 510         bool enabled;
 511         const char *name;
 512         enum fw3_family family;
 513
 514         const char *path;
 515         enum fw3_include_type type;
 516
 517         bool reload;
 518 };
 519
 520 struct fw3_cthelper
 521 {
 522         struct list_head list;
 523
 524         bool enabled;
 525         const char *name;
 526         const char *module;
 527         const char *description;
 528         enum fw3_family family;
 529         struct fw3_protocol proto;
 530         struct fw3_port port;
 531 };
 532
 533 struct fw3_setentry
 534 {
 535         struct list_head list;
 536         const char *value;
 537 };
 538
 539 struct fw3_state
 540 {
 541         struct uci_context *uci;
 542         struct fw3_defaults defaults;
 543         struct list_head zones;
 544         struct list_head rules;
 545         struct list_head redirects;
 546         struct list_head snats;
 547         struct list_head forwards;
 548         struct list_head ipsets;
 549         struct list_head includes;
 550         struct list_head cthelpers;
 551
 552         bool disable_ipsets;
 553         bool statefile;
 554 };
 555
 556 struct fw3_chain_spec {
 557         int family;
 558         int table;
 559         int flag;
 560         const char *format;
 561 };
 562
 563
 564 struct fw3_option
 565 {
 566         const char *name;
 567         bool (*parse)(void *, const char *, bool);
 568         uintptr_t offset;
 569         size_t elem_size;
 570 };
 571
 572 #define FW3_OPT(name, parse, structure, member) \
 573         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member) }
 574
 575 #define FW3_LIST(name, parse, structure, member) \
 576         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member), \
 577           sizeof(struct fw3_##structure) }
 578
 579 bool fw3_parse_bool(void *ptr, const char *val, bool is_list);
 580 bool fw3_parse_int(void *ptr, const char *val, bool is_list);
 581 bool fw3_parse_string(void *ptr, const char *val, bool is_list);
 582 bool fw3_parse_target(void *ptr, const char *val, bool is_list);
 583 bool fw3_parse_limit(void *ptr, const char *val, bool is_list);
 584 bool fw3_parse_device(void *ptr, const char *val, bool is_list);
 585 bool fw3_parse_address(void *ptr, const char *val, bool is_list);
 586 bool fw3_parse_network(void *ptr, const char *val, bool is_list);
 587 bool fw3_parse_mac(void *ptr, const char *val, bool is_list);
 588 bool fw3_parse_port(void *ptr, const char *val, bool is_list);
 589 bool fw3_parse_family(void *ptr, const char *val, bool is_list);
 590 bool fw3_parse_icmptype(void *ptr, const char *val, bool is_list);
 591 bool fw3_parse_protocol(void *ptr, const char *val, bool is_list);
 592
 593 bool fw3_parse_ipset_method(void *ptr, const char *val, bool is_list);
 594 bool fw3_parse_ipset_datatype(void *ptr, const char *val, bool is_list);
 595
 596 bool fw3_parse_include_type(void *ptr, const char *val, bool is_list);
 597 bool fw3_parse_reflection_source(void *ptr, const char *val, bool is_list);
 598
 599 bool fw3_parse_date(void *ptr, const char *val, bool is_list);
 600 bool fw3_parse_time(void *ptr, const char *val, bool is_list);
 601 bool fw3_parse_weekdays(void *ptr, const char *val, bool is_list);
 602 bool fw3_parse_monthdays(void *ptr, const char *val, bool is_list);
 603 bool fw3_parse_mark(void *ptr, const char *val, bool is_list);
 604 bool fw3_parse_setmatch(void *ptr, const char *val, bool is_list);
 605 bool fw3_parse_direction(void *ptr, const char *val, bool is_list);
 606 bool fw3_parse_cthelper(void *ptr, const char *val, bool is_list);
 607 bool fw3_parse_setentry(void *ptr, const char *val, bool is_list);
 608
 609 bool fw3_parse_options(void *s, const struct fw3_option *opts,
 610                        struct uci_section *section);
 611 bool fw3_parse_blob_options(void *s, const struct fw3_option *opts,
 612                             struct blob_attr *a, const char *name);
 613
 614 const char * fw3_address_to_string(struct fw3_address *address,
 615                                    bool allow_invert, bool as_cidr);
 616
 617 #endif