options.h

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   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 #include <netinet/in.h>
  36 #include <netinet/ether.h>
  37
  38 #include <time.h>
  39
  40 #include <uci.h>
  41
  42 #include <libubox/list.h>
  43 #include <libubox/utils.h>
  44
  45 #include "icmp_codes.h"
  46 #include "utils.h"
  47
  48
  49 enum fw3_table
  50 {
  51         FW3_TABLE_FILTER = 0,
  52         FW3_TABLE_NAT    = 1,
  53         FW3_TABLE_MANGLE = 2,
  54         FW3_TABLE_RAW    = 3,
  55 };
  56
  57 enum fw3_family
  58 {
  59         FW3_FAMILY_ANY = 0,
  60         FW3_FAMILY_V4  = 4,
  61         FW3_FAMILY_V6  = 5,
  62 };
  63
  64 enum fw3_target
  65 {
  66         FW3_TARGET_UNSPEC  = 0,
  67         FW3_TARGET_ACCEPT  = 6,
  68         FW3_TARGET_REJECT  = 7,
  69         FW3_TARGET_DROP    = 8,
  70         FW3_TARGET_NOTRACK = 9,
  71         FW3_TARGET_DNAT    = 10,
  72         FW3_TARGET_SNAT    = 11,
  73 };
  74
  75 enum fw3_default
  76 {
  77         FW3_DEFAULT_UNSPEC        = 0,
  78         FW3_DEFAULT_CUSTOM_CHAINS = 12,
  79         FW3_DEFAULT_SYN_FLOOD     = 13,
  80         FW3_DEFAULT_MTU_FIX       = 14,
  81         FW3_DEFAULT_DROP_INVALID  = 15,
  82 };
  83
  84 extern const char *fw3_flag_names[FW3_DEFAULT_DROP_INVALID + 1];
  85
  86
  87 enum fw3_limit_unit
  88 {
  89         FW3_LIMIT_UNIT_SECOND = 0,
  90         FW3_LIMIT_UNIT_MINUTE = 1,
  91         FW3_LIMIT_UNIT_HOUR   = 2,
  92         FW3_LIMIT_UNIT_DAY    = 3,
  93 };
  94
  95 enum fw3_ipset_method
  96 {
  97         FW3_IPSET_METHOD_UNSPEC = 0,
  98         FW3_IPSET_METHOD_BITMAP = 1,
  99         FW3_IPSET_METHOD_HASH   = 2,
 100         FW3_IPSET_METHOD_LIST   = 3,
 101 };
 102
 103 enum fw3_ipset_type
 104 {
 105         FW3_IPSET_TYPE_UNSPEC = 0,
 106         FW3_IPSET_TYPE_IP     = 1,
 107         FW3_IPSET_TYPE_PORT   = 2,
 108         FW3_IPSET_TYPE_MAC    = 3,
 109         FW3_IPSET_TYPE_NET    = 4,
 110         FW3_IPSET_TYPE_SET    = 5,
 111 };
 112
 113 enum fw3_include_type
 114 {
 115         FW3_INC_TYPE_SCRIPT   = 0,
 116         FW3_INC_TYPE_RESTORE  = 1,
 117 };
 118
 119 struct fw3_ipset_datatype
 120 {
 121         struct list_head list;
 122         enum fw3_ipset_type type;
 123         bool dest;
 124 };
 125
 126 struct fw3_device
 127 {
 128         struct list_head list;
 129
 130         bool set;
 131         bool any;
 132         bool invert;
 133         char name[32];
 134 };
 135
 136 struct fw3_address
 137 {
 138         struct list_head list;
 139
 140         bool set;
 141         bool range;
 142         bool invert;
 143         enum fw3_family family;
 144         int mask;
 145         union {
 146                 struct in_addr v4;
 147                 struct in6_addr v6;
 148                 struct ether_addr mac;
 149         } address;
 150         union {
 151                 struct in_addr v4;
 152                 struct in6_addr v6;
 153                 struct ether_addr mac;
 154         } address2;
 155 };
 156
 157 struct fw3_mac
 158 {
 159         struct list_head list;
 160
 161         bool set;
 162         bool invert;
 163         struct ether_addr mac;
 164 };
 165
 166 struct fw3_protocol
 167 {
 168         struct list_head list;
 169
 170         bool any;
 171         bool invert;
 172         uint16_t protocol;
 173 };
 174
 175 struct fw3_port
 176 {
 177         struct list_head list;
 178
 179         bool set;
 180         bool invert;
 181         uint16_t port_min;
 182         uint16_t port_max;
 183 };
 184
 185 struct fw3_icmptype
 186 {
 187         struct list_head list;
 188
 189         bool invert;
 190         enum fw3_family family;
 191         uint8_t type;
 192         uint8_t code_min;
 193         uint8_t code_max;
 194         uint8_t type6;
 195         uint8_t code6_min;
 196         uint8_t code6_max;
 197 };
 198
 199 struct fw3_limit
 200 {
 201         bool invert;
 202         int rate;
 203         int burst;
 204         enum fw3_limit_unit unit;
 205 };
 206
 207 struct fw3_time
 208 {
 209         bool utc;
 210         struct tm datestart;
 211         struct tm datestop;
 212         uint32_t timestart;
 213         uint32_t timestop;
 214         uint32_t monthdays; /* bit 0 is invert + 1 .. 31 */
 215         uint8_t weekdays;   /* bit 0 is invert + 1 .. 7 */
 216 };
 217
 218 struct fw3_defaults
 219 {
 220         enum fw3_target policy_input;
 221         enum fw3_target policy_output;
 222         enum fw3_target policy_forward;
 223
 224         bool drop_invalid;
 225
 226         bool syn_flood;
 227         struct fw3_limit syn_flood_rate;
 228
 229         bool tcp_syncookies;
 230         bool tcp_ecn;
 231         bool tcp_westwood;
 232         bool tcp_window_scaling;
 233
 234         bool accept_redirects;
 235         bool accept_source_route;
 236
 237         bool custom_chains;
 238
 239         bool disable_ipv6;
 240
 241         uint16_t flags;
 242 };
 243
 244 struct fw3_zone
 245 {
 246         struct list_head list;
 247         struct list_head running_list;
 248
 249         const char *name;
 250
 251         enum fw3_family family;
 252
 253         enum fw3_target policy_input;
 254         enum fw3_target policy_output;
 255         enum fw3_target policy_forward;
 256
 257         struct list_head networks;
 258         struct list_head devices;
 259         struct list_head subnets;
 260
 261         const char *extra_src;
 262         const char *extra_dest;
 263
 264         bool masq;
 265         struct list_head masq_src;
 266         struct list_head masq_dest;
 267
 268         bool conntrack;
 269         bool mtu_fix;
 270
 271         bool log;
 272         struct fw3_limit log_limit;
 273
 274         bool custom_chains;
 275
 276         uint16_t src_flags;
 277         uint16_t dst_flags;
 278 };
 279
 280 struct fw3_rule
 281 {
 282         struct list_head list;
 283
 284         const char *name;
 285
 286         enum fw3_family family;
 287
 288         struct fw3_zone *_src;
 289         struct fw3_zone *_dest;
 290
 291         struct fw3_device src;
 292         struct fw3_device dest;
 293
 294         struct fw3_ipset *_ipset;
 295         struct fw3_device ipset;
 296
 297         struct list_head proto;
 298
 299         struct list_head ip_src;
 300         struct list_head mac_src;
 301         struct list_head port_src;
 302
 303         struct list_head ip_dest;
 304         struct list_head port_dest;
 305
 306         struct list_head icmp_type;
 307
 308         struct fw3_limit limit;
 309         struct fw3_time time;
 310
 311         enum fw3_target target;
 312
 313         const char *extra;
 314 };
 315
 316 struct fw3_redirect
 317 {
 318         struct list_head list;
 319
 320         const char *name;
 321
 322         enum fw3_family family;
 323
 324         struct fw3_zone *_src;
 325         struct fw3_zone *_dest;
 326
 327         struct fw3_device src;
 328         struct fw3_device dest;
 329
 330         struct fw3_ipset *_ipset;
 331         struct fw3_device ipset;
 332
 333         struct list_head proto;
 334
 335         struct fw3_address ip_src;
 336         struct list_head mac_src;
 337         struct fw3_port port_src;
 338
 339         struct fw3_address ip_dest;
 340         struct fw3_port port_dest;
 341
 342         struct fw3_address ip_redir;
 343         struct fw3_port port_redir;
 344
 345         struct fw3_time time;
 346
 347         enum fw3_target target;
 348
 349         const char *extra;
 350
 351         bool reflection;
 352 };
 353
 354 struct fw3_forward
 355 {
 356         struct list_head list;
 357
 358         const char *name;
 359
 360         enum fw3_family family;
 361
 362         struct fw3_zone *_src;
 363         struct fw3_zone *_dest;
 364
 365         struct fw3_device src;
 366         struct fw3_device dest;
 367 };
 368
 369 struct fw3_ipset
 370 {
 371         struct list_head list;
 372         struct list_head running_list;
 373
 374         const char *name;
 375         enum fw3_family family;
 376
 377         enum fw3_ipset_method method;
 378         struct list_head datatypes;
 379
 380         struct fw3_address iprange;
 381         struct fw3_port portrange;
 382
 383         int netmask;
 384         int maxelem;
 385         int hashsize;
 386
 387         int timeout;
 388
 389         const char *external;
 390
 391         uint16_t flags;
 392 };
 393
 394 struct fw3_include
 395 {
 396         struct list_head list;
 397         struct list_head running_list;
 398
 399         const char *name;
 400         enum fw3_family family;
 401
 402         const char *path;
 403         enum fw3_include_type type;
 404 };
 405
 406 struct fw3_state
 407 {
 408         struct uci_context *uci;
 409         struct fw3_defaults defaults;
 410         struct list_head zones;
 411         struct list_head rules;
 412         struct list_head redirects;
 413         struct list_head forwards;
 414         struct list_head ipsets;
 415         struct list_head includes;
 416
 417         struct fw3_defaults running_defaults;
 418         struct list_head running_zones;
 419         struct list_head running_ipsets;
 420
 421         bool disable_ipsets;
 422         bool statefile;
 423 };
 424
 425
 426 struct fw3_option
 427 {
 428         const char *name;
 429         bool (*parse)(void *, const char *);
 430         uintptr_t offset;
 431         size_t elem_size;
 432 };
 433
 434 #define FW3_OPT(name, parse, structure, member) \
 435         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member) }
 436
 437 #define FW3_LIST(name, parse, structure, member) \
 438         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member), \
 439           sizeof(struct fw3_##structure) }
 440
 441
 442 bool fw3_parse_bool(void *ptr, const char *val);
 443 bool fw3_parse_int(void *ptr, const char *val);
 444 bool fw3_parse_string(void *ptr, const char *val);
 445 bool fw3_parse_target(void *ptr, const char *val);
 446 bool fw3_parse_limit(void *ptr, const char *val);
 447 bool fw3_parse_device(void *ptr, const char *val);
 448 bool fw3_parse_address(void *ptr, const char *val);
 449 bool fw3_parse_mac(void *ptr, const char *val);
 450 bool fw3_parse_port(void *ptr, const char *val);
 451 bool fw3_parse_family(void *ptr, const char *val);
 452 bool fw3_parse_icmptype(void *ptr, const char *val);
 453 bool fw3_parse_protocol(void *ptr, const char *val);
 454
 455 bool fw3_parse_ipset_method(void *ptr, const char *val);
 456 bool fw3_parse_ipset_datatype(void *ptr, const char *val);
 457
 458 bool fw3_parse_include_type(void *ptr, const char *val);
 459
 460 bool fw3_parse_date(void *ptr, const char *val);
 461 bool fw3_parse_time(void *ptr, const char *val);
 462 bool fw3_parse_weekdays(void *ptr, const char *val);
 463 bool fw3_parse_monthdays(void *ptr, const char *val);
 464
 465 void fw3_parse_options(void *s, const struct fw3_option *opts,
 466                        struct uci_section *section);
 467
 468 void fw3_format_in_out(struct fw3_device *in, struct fw3_device *out);
 469 void fw3_format_src_dest(struct fw3_address *src, struct fw3_address *dest);
 470 void fw3_format_sport_dport(struct fw3_port *sp, struct fw3_port *dp);
 471 void fw3_format_mac(struct fw3_mac *mac);
 472 void fw3_format_protocol(struct fw3_protocol *proto, enum fw3_family family);
 473 void fw3_format_icmptype(struct fw3_icmptype *icmp, enum fw3_family family);
 474 void fw3_format_limit(struct fw3_limit *limit);
 475 void fw3_format_ipset(struct fw3_ipset *ipset, bool invert);
 476 void fw3_format_time(struct fw3_time *time);
 477
 478 void __fw3_format_comment(const char *comment, ...);
 479 #define fw3_format_comment(...) __fw3_format_comment(__VA_ARGS__, NULL)
 480
 481 void fw3_format_extra(const char *extra);
 482
 483 #endif