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