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_DSCP          = 12,
  77         FW3_FLAG_DNAT          = 13,
  78         FW3_FLAG_SNAT          = 14,
  79         FW3_FLAG_MASQUERADE    = 15,
  80         FW3_FLAG_SRC_ACCEPT    = 16,
  81         FW3_FLAG_SRC_REJECT    = 17,
  82         FW3_FLAG_SRC_DROP      = 18,
  83         FW3_FLAG_CUSTOM_CHAINS = 19,
  84         FW3_FLAG_SYN_FLOOD     = 20,
  85         FW3_FLAG_MTU_FIX       = 21,
  86         FW3_FLAG_DROP_INVALID  = 22,
  87         FW3_FLAG_HOTPLUG       = 23,
  88
  89         __FW3_FLAG_MAX
  90 };
  91
  92 enum fw3_reject_code
  93 {
  94         FW3_REJECT_CODE_TCP_RESET      = 0,
  95         FW3_REJECT_CODE_PORT_UNREACH   = 1,
  96         FW3_REJECT_CODE_ADM_PROHIBITED = 2,
  97
  98         __FW3_REJECT_CODE_MAX
  99 };
 100
 101 extern const char *fw3_flag_names[__FW3_FLAG_MAX];
 102
 103
 104 enum fw3_limit_unit
 105 {
 106         FW3_LIMIT_UNIT_SECOND = 0,
 107         FW3_LIMIT_UNIT_MINUTE = 1,
 108         FW3_LIMIT_UNIT_HOUR   = 2,
 109         FW3_LIMIT_UNIT_DAY    = 3,
 110
 111         __FW3_LIMIT_UNIT_MAX
 112 };
 113
 114 extern const char *fw3_limit_units[__FW3_LIMIT_UNIT_MAX];
 115
 116
 117 enum fw3_ipset_method
 118 {
 119         FW3_IPSET_METHOD_UNSPEC = 0,
 120         FW3_IPSET_METHOD_BITMAP = 1,
 121         FW3_IPSET_METHOD_HASH   = 2,
 122         FW3_IPSET_METHOD_LIST   = 3,
 123
 124         __FW3_IPSET_METHOD_MAX
 125 };
 126
 127 enum fw3_ipset_type
 128 {
 129         FW3_IPSET_TYPE_UNSPEC = 0,
 130         FW3_IPSET_TYPE_IP     = 1,
 131         FW3_IPSET_TYPE_PORT   = 2,
 132         FW3_IPSET_TYPE_MAC    = 3,
 133         FW3_IPSET_TYPE_NET    = 4,
 134         FW3_IPSET_TYPE_SET    = 5,
 135
 136         __FW3_IPSET_TYPE_MAX
 137 };
 138
 139 extern const char *fw3_ipset_method_names[__FW3_IPSET_METHOD_MAX];
 140 extern const char *fw3_ipset_type_names[__FW3_IPSET_TYPE_MAX];
 141
 142
 143 enum fw3_include_type
 144 {
 145         FW3_INC_TYPE_SCRIPT   = 0,
 146         FW3_INC_TYPE_RESTORE  = 1,
 147 };
 148
 149 enum fw3_reflection_source
 150 {
 151         FW3_REFLECTION_INTERNAL = 0,
 152         FW3_REFLECTION_EXTERNAL = 1,
 153 };
 154
 155 struct fw3_ipset_datatype
 156 {
 157         struct list_head list;
 158         enum fw3_ipset_type type;
 159         const char *dir;
 160 };
 161
 162 struct fw3_setmatch
 163 {
 164         bool set;
 165         bool invert;
 166         char name[32];
 167         const char *dir[3];
 168         struct fw3_ipset *ptr;
 169 };
 170
 171 struct fw3_device
 172 {
 173         struct list_head list;
 174
 175         bool set;
 176         bool any;
 177         bool invert;
 178         char name[32];
 179         char network[32];
 180 };
 181
 182 struct fw3_address
 183 {
 184         struct list_head list;
 185
 186         bool set;
 187         bool range;
 188         bool invert;
 189         bool resolved;
 190         enum fw3_family family;
 191         union {
 192                 struct in_addr v4;
 193                 struct in6_addr v6;
 194                 struct ether_addr mac;
 195         } address;
 196         union {
 197                 struct in_addr v4;
 198                 struct in6_addr v6;
 199                 struct ether_addr mac;
 200         } mask;
 201 };
 202
 203 struct fw3_mac
 204 {
 205         struct list_head list;
 206
 207         bool set;
 208         bool invert;
 209         struct ether_addr mac;
 210 };
 211
 212 struct fw3_protocol
 213 {
 214         struct list_head list;
 215
 216         bool any;
 217         bool invert;
 218         uint32_t protocol;
 219 };
 220
 221 struct fw3_port
 222 {
 223         struct list_head list;
 224
 225         bool set;
 226         bool invert;
 227         uint16_t port_min;
 228         uint16_t port_max;
 229 };
 230
 231 struct fw3_icmptype
 232 {
 233         struct list_head list;
 234
 235         bool invert;
 236         enum fw3_family family;
 237         uint8_t type;
 238         uint8_t code_min;
 239         uint8_t code_max;
 240         uint8_t type6;
 241         uint8_t code6_min;
 242         uint8_t code6_max;
 243 };
 244
 245 struct fw3_limit
 246 {
 247         bool invert;
 248         int rate;
 249         int burst;
 250         enum fw3_limit_unit unit;
 251 };
 252
 253 struct fw3_time
 254 {
 255         bool utc;
 256         struct tm datestart;
 257         struct tm datestop;
 258         uint32_t timestart;
 259         uint32_t timestop;
 260         uint32_t monthdays; /* bit 0 is invert + 1 .. 31 */
 261         uint8_t weekdays;   /* bit 0 is invert + 1 .. 7 */
 262 };
 263
 264 struct fw3_mark
 265 {
 266         bool set;
 267         bool invert;
 268         uint32_t mark;
 269         uint32_t mask;
 270 };
 271
 272 struct fw3_dscp
 273 {
 274         bool set;
 275         bool invert;
 276         uint8_t dscp;
 277 };
 278
 279 struct fw3_cthelpermatch
 280 {
 281         struct list_head list;
 282
 283         bool set;
 284         bool invert;
 285         char name[32];
 286         struct fw3_cthelper *ptr;
 287 };
 288
 289 struct fw3_defaults
 290 {
 291         enum fw3_flag policy_input;
 292         enum fw3_flag policy_output;
 293         enum fw3_flag policy_forward;
 294
 295         bool drop_invalid;
 296         enum fw3_reject_code tcp_reject_code;
 297         enum fw3_reject_code any_reject_code;
 298
 299         bool syn_flood;
 300         struct fw3_limit syn_flood_rate;
 301
 302         bool tcp_syncookies;
 303         int tcp_ecn;
 304         bool tcp_window_scaling;
 305
 306         bool accept_redirects;
 307         bool accept_source_route;
 308
 309         bool custom_chains;
 310         bool auto_helper;
 311         bool flow_offloading;
 312         bool flow_offloading_hw;
 313
 314         bool disable_ipv6;
 315
 316         uint32_t flags[2];
 317 };
 318
 319 struct fw3_zone
 320 {
 321         struct list_head list;
 322
 323         bool enabled;
 324         const char *name;
 325
 326         enum fw3_family family;
 327
 328         enum fw3_flag policy_input;
 329         enum fw3_flag policy_output;
 330         enum fw3_flag policy_forward;
 331
 332         struct list_head networks;
 333         struct list_head devices;
 334         struct list_head subnets;
 335
 336         const char *extra_src;
 337         const char *extra_dest;
 338
 339         bool masq;
 340         bool masq_allow_invalid;
 341         struct list_head masq_src;
 342         struct list_head masq_dest;
 343
 344         bool mtu_fix;
 345
 346         struct list_head cthelpers;
 347
 348         int log;
 349         struct fw3_limit log_limit;
 350
 351         bool custom_chains;
 352         bool auto_helper;
 353
 354         uint32_t flags[2];
 355
 356         struct list_head old_addrs;
 357 };
 358
 359 struct fw3_rule
 360 {
 361         struct list_head list;
 362
 363         bool enabled;
 364         const char *name;
 365
 366         enum fw3_family family;
 367
 368         struct fw3_zone *_src;
 369         struct fw3_zone *_dest;
 370
 371         const char *device;
 372         bool direction_out;
 373
 374         struct fw3_device src;
 375         struct fw3_device dest;
 376         struct fw3_setmatch ipset;
 377         struct fw3_cthelpermatch helper;
 378
 379         struct list_head proto;
 380
 381         struct list_head ip_src;
 382         struct list_head mac_src;
 383         struct list_head port_src;
 384
 385         struct list_head ip_dest;
 386         struct list_head port_dest;
 387
 388         struct list_head icmp_type;
 389
 390         struct fw3_limit limit;
 391         struct fw3_time time;
 392         struct fw3_mark mark;
 393         struct fw3_dscp dscp;
 394
 395         enum fw3_flag target;
 396         struct fw3_mark set_mark;
 397         struct fw3_mark set_xmark;
 398         struct fw3_dscp set_dscp;
 399         struct fw3_cthelpermatch set_helper;
 400
 401         const char *extra;
 402 };
 403
 404 struct fw3_redirect
 405 {
 406         struct list_head list;
 407
 408         bool enabled;
 409         const char *name;
 410
 411         enum fw3_family family;
 412
 413         struct fw3_zone *_src;
 414         struct fw3_zone *_dest;
 415
 416         struct fw3_device src;
 417         struct fw3_device dest;
 418         struct fw3_setmatch ipset;
 419         struct fw3_cthelpermatch helper;
 420
 421         struct list_head proto;
 422
 423         struct fw3_address ip_src;
 424         struct list_head mac_src;
 425         struct fw3_port port_src;
 426
 427         struct fw3_address ip_dest;
 428         struct fw3_port port_dest;
 429
 430         struct fw3_address ip_redir;
 431         struct fw3_port port_redir;
 432
 433         struct fw3_limit limit;
 434         struct fw3_time time;
 435         struct fw3_mark mark;
 436
 437         enum fw3_flag target;
 438
 439         const char *extra;
 440
 441         bool local;
 442         bool reflection;
 443         enum fw3_reflection_source reflection_src;
 444         struct list_head reflection_zones;
 445 };
 446
 447 struct fw3_snat
 448 {
 449         struct list_head list;
 450
 451         bool enabled;
 452         const char *name;
 453
 454         enum fw3_family family;
 455
 456         struct fw3_zone *_src;
 457
 458         struct fw3_device src;
 459         struct fw3_setmatch ipset;
 460         struct fw3_cthelpermatch helper;
 461         const char *device;
 462
 463         struct list_head proto;
 464
 465         struct fw3_address ip_src;
 466         struct fw3_port port_src;
 467
 468         struct fw3_address ip_dest;
 469         struct fw3_port port_dest;
 470
 471         struct fw3_address ip_snat;
 472         struct fw3_port port_snat;
 473
 474         struct fw3_limit limit;
 475         struct fw3_time time;
 476         struct fw3_mark mark;
 477         bool connlimit_ports;
 478
 479         enum fw3_flag target;
 480
 481         const char *extra;
 482 };
 483
 484 struct fw3_forward
 485 {
 486         struct list_head list;
 487
 488         bool enabled;
 489         const char *name;
 490
 491         enum fw3_family family;
 492
 493         struct fw3_zone *_src;
 494         struct fw3_zone *_dest;
 495
 496         struct fw3_device src;
 497         struct fw3_device dest;
 498 };
 499
 500 struct fw3_ipset
 501 {
 502         struct list_head list;
 503
 504         bool enabled;
 505         bool reload_set;
 506         bool counters;
 507         bool comment;
 508
 509         const char *name;
 510         enum fw3_family family;
 511
 512         enum fw3_ipset_method method;
 513         struct list_head datatypes;
 514
 515         struct fw3_address iprange;
 516         struct fw3_port portrange;
 517
 518         int netmask;
 519         int maxelem;
 520         int hashsize;
 521
 522         int timeout;
 523
 524         const char *external;
 525
 526         struct list_head entries;
 527         const char *loadfile;
 528
 529         uint32_t flags[2];
 530 };
 531
 532 struct fw3_include
 533 {
 534         struct list_head list;
 535
 536         bool enabled;
 537         const char *name;
 538         enum fw3_family family;
 539
 540         const char *path;
 541         enum fw3_include_type type;
 542
 543         bool reload;
 544 };
 545
 546 struct fw3_cthelper
 547 {
 548         struct list_head list;
 549
 550         bool enabled;
 551         const char *name;
 552         const char *module;
 553         const char *description;
 554         enum fw3_family family;
 555         struct list_head proto;
 556         struct fw3_port port;
 557 };
 558
 559 struct fw3_setentry
 560 {
 561         struct list_head list;
 562         const char *value;
 563 };
 564
 565 struct fw3_state
 566 {
 567         struct uci_context *uci;
 568         struct fw3_defaults defaults;
 569         struct list_head zones;
 570         struct list_head rules;
 571         struct list_head redirects;
 572         struct list_head snats;
 573         struct list_head forwards;
 574         struct list_head ipsets;
 575         struct list_head includes;
 576         struct list_head cthelpers;
 577
 578         bool disable_ipsets;
 579         bool statefile;
 580 };
 581
 582 struct fw3_chain_spec {
 583         int family;
 584         int table;
 585         int flag;
 586         const char *format;
 587 };
 588
 589
 590 struct fw3_option
 591 {
 592         const char *name;
 593         bool (*parse)(void *, const char *, bool);
 594         uintptr_t offset;
 595         size_t elem_size;
 596 };
 597
 598 #define FW3_OPT(name, parse, structure, member) \
 599         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member) }
 600
 601 #define FW3_LIST(name, parse, structure, member) \
 602         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member), \
 603           sizeof(struct fw3_##structure) }
 604
 605 bool fw3_parse_bool(void *ptr, const char *val, bool is_list);
 606 bool fw3_parse_int(void *ptr, const char *val, bool is_list);
 607 bool fw3_parse_string(void *ptr, const char *val, bool is_list);
 608 bool fw3_parse_target(void *ptr, const char *val, bool is_list);
 609 bool fw3_parse_reject_code(void *ptr, const char *val, bool is_list);
 610 bool fw3_parse_limit(void *ptr, const char *val, bool is_list);
 611 bool fw3_parse_device(void *ptr, const char *val, bool is_list);
 612 bool fw3_parse_address(void *ptr, const char *val, bool is_list);
 613 bool fw3_parse_network(void *ptr, const char *val, bool is_list);
 614 bool fw3_parse_mac(void *ptr, const char *val, bool is_list);
 615 bool fw3_parse_port(void *ptr, const char *val, bool is_list);
 616 bool fw3_parse_family(void *ptr, const char *val, bool is_list);
 617 bool fw3_parse_icmptype(void *ptr, const char *val, bool is_list);
 618 bool fw3_parse_protocol(void *ptr, const char *val, bool is_list);
 619
 620 bool fw3_parse_ipset_method(void *ptr, const char *val, bool is_list);
 621 bool fw3_parse_ipset_datatype(void *ptr, const char *val, bool is_list);
 622
 623 bool fw3_parse_include_type(void *ptr, const char *val, bool is_list);
 624 bool fw3_parse_reflection_source(void *ptr, const char *val, bool is_list);
 625
 626 bool fw3_parse_date(void *ptr, const char *val, bool is_list);
 627 bool fw3_parse_time(void *ptr, const char *val, bool is_list);
 628 bool fw3_parse_weekdays(void *ptr, const char *val, bool is_list);
 629 bool fw3_parse_monthdays(void *ptr, const char *val, bool is_list);
 630 bool fw3_parse_mark(void *ptr, const char *val, bool is_list);
 631 bool fw3_parse_dscp(void *ptr, const char *val, bool is_list);
 632 bool fw3_parse_setmatch(void *ptr, const char *val, bool is_list);
 633 bool fw3_parse_direction(void *ptr, const char *val, bool is_list);
 634 bool fw3_parse_cthelper(void *ptr, const char *val, bool is_list);
 635 bool fw3_parse_setentry(void *ptr, const char *val, bool is_list);
 636
 637 bool fw3_parse_options(void *s, const struct fw3_option *opts,
 638                        struct uci_section *section);
 639 bool fw3_parse_blob_options(void *s, const struct fw3_option *opts,
 640                             struct blob_attr *a, const char *name);
 641
 642 const char * fw3_address_to_string(struct fw3_address *address,
 643                                    bool allow_invert, bool as_cidr);
 644
 645 #endif