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 = 0,
  50         FW3_TABLE_NAT    = 1,
  51         FW3_TABLE_MANGLE = 2,
  52         FW3_TABLE_RAW    = 3,
  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_default
  74 {
  75         FW3_DEFAULT_UNSPEC        = 0,
  76         FW3_DEFAULT_CUSTOM_CHAINS = 1,
  77         FW3_DEFAULT_SYN_FLOOD     = 2,
  78         FW3_DEFAULT_MTU_FIX       = 3,
  79         FW3_DEFAULT_DROP_INVALID  = 4,
  80         FW3_DEFAULT_IPV4_LOADED   = 5,
  81         FW3_DEFAULT_IPV6_LOADED   = 6,
  82 };
  83
  84 enum fw3_limit_unit
  85 {
  86         FW3_LIMIT_UNIT_SECOND = 0,
  87         FW3_LIMIT_UNIT_MINUTE = 1,
  88         FW3_LIMIT_UNIT_HOUR   = 2,
  89         FW3_LIMIT_UNIT_DAY    = 3,
  90 };
  91
  92 enum fw3_ipset_method
  93 {
  94         FW3_IPSET_METHOD_UNSPEC = 0,
  95         FW3_IPSET_METHOD_BITMAP = 1,
  96         FW3_IPSET_METHOD_HASH   = 2,
  97         FW3_IPSET_METHOD_LIST   = 3,
  98 };
  99
 100 enum fw3_ipset_type
 101 {
 102         FW3_IPSET_TYPE_UNSPEC = 0,
 103         FW3_IPSET_TYPE_IP     = 1,
 104         FW3_IPSET_TYPE_PORT   = 2,
 105         FW3_IPSET_TYPE_MAC    = 3,
 106         FW3_IPSET_TYPE_NET    = 4,
 107         FW3_IPSET_TYPE_SET    = 5,
 108 };
 109
 110 struct fw3_ipset_datatype
 111 {
 112         struct list_head list;
 113         enum fw3_ipset_type type;
 114         bool dest;
 115 };
 116
 117 struct fw3_device
 118 {
 119         struct list_head list;
 120
 121         bool set;
 122         bool any;
 123         bool invert;
 124         char name[32];
 125 };
 126
 127 struct fw3_address
 128 {
 129         struct list_head list;
 130
 131         bool set;
 132         bool invert;
 133         enum fw3_family family;
 134         int mask;
 135         union {
 136                 struct in_addr v4;
 137                 struct in6_addr v6;
 138                 struct ether_addr mac;
 139         } address;
 140 };
 141
 142 struct fw3_mac
 143 {
 144         struct list_head list;
 145
 146         bool set;
 147         bool invert;
 148         struct ether_addr mac;
 149 };
 150
 151 struct fw3_protocol
 152 {
 153         struct list_head list;
 154
 155         bool any;
 156         bool invert;
 157         uint16_t protocol;
 158 };
 159
 160 struct fw3_port
 161 {
 162         struct list_head list;
 163
 164         bool set;
 165         bool invert;
 166         uint16_t port_min;
 167         uint16_t port_max;
 168 };
 169
 170 struct fw3_icmptype
 171 {
 172         struct list_head list;
 173
 174         bool invert;
 175         enum fw3_family family;
 176         uint8_t type;
 177         uint8_t code_min;
 178         uint8_t code_max;
 179         uint8_t type6;
 180         uint8_t code6_min;
 181         uint8_t code6_max;
 182 };
 183
 184 struct fw3_limit
 185 {
 186         bool invert;
 187         int rate;
 188         int burst;
 189         enum fw3_limit_unit unit;
 190 };
 191
 192 struct fw3_defaults
 193 {
 194         enum fw3_target policy_input;
 195         enum fw3_target policy_output;
 196         enum fw3_target policy_forward;
 197
 198         bool drop_invalid;
 199
 200         bool syn_flood;
 201         struct fw3_limit syn_flood_rate;
 202
 203         bool tcp_syncookies;
 204         bool tcp_ecn;
 205         bool tcp_westwood;
 206         bool tcp_window_scaling;
 207
 208         bool accept_redirects;
 209         bool accept_source_route;
 210
 211         bool custom_chains;
 212
 213         bool disable_ipv6;
 214
 215         uint8_t has_flag;
 216 };
 217
 218 struct fw3_zone
 219 {
 220         struct list_head list;
 221
 222         const char *name;
 223
 224         enum fw3_family family;
 225
 226         enum fw3_target policy_input;
 227         enum fw3_target policy_output;
 228         enum fw3_target policy_forward;
 229
 230         struct list_head networks;
 231         struct list_head devices;
 232         struct list_head subnets;
 233
 234         const char *extra_src;
 235         const char *extra_dest;
 236
 237         bool masq;
 238         struct list_head masq_src;
 239         struct list_head masq_dest;
 240
 241         bool conntrack;
 242         bool mtu_fix;
 243
 244         bool log;
 245         struct fw3_limit log_limit;
 246
 247         bool custom_chains;
 248
 249         uint8_t has_src_target;
 250         uint8_t has_dest_target;
 251 };
 252
 253 struct fw3_rule
 254 {
 255         struct list_head list;
 256
 257         const char *name;
 258
 259         enum fw3_family family;
 260
 261         struct fw3_zone *_src;
 262         struct fw3_zone *_dest;
 263
 264         struct fw3_device src;
 265         struct fw3_device dest;
 266
 267         struct fw3_ipset *_ipset;
 268         struct fw3_device ipset;
 269
 270         struct list_head proto;
 271
 272         struct list_head ip_src;
 273         struct list_head mac_src;
 274         struct list_head port_src;
 275
 276         struct list_head ip_dest;
 277         struct list_head port_dest;
 278
 279         struct list_head icmp_type;
 280
 281         enum fw3_target target;
 282
 283         struct fw3_limit limit;
 284
 285         const char *extra;
 286 };
 287
 288 struct fw3_redirect
 289 {
 290         struct list_head list;
 291
 292         const char *name;
 293
 294         enum fw3_family family;
 295
 296         struct fw3_zone *_src;
 297         struct fw3_zone *_dest;
 298
 299         struct fw3_device src;
 300         struct fw3_device dest;
 301
 302         struct fw3_ipset *_ipset;
 303         struct fw3_device ipset;
 304
 305         struct list_head proto;
 306
 307         struct fw3_address ip_src;
 308         struct list_head mac_src;
 309         struct fw3_port port_src;
 310
 311         struct fw3_address ip_dest;
 312         struct fw3_port port_dest;
 313
 314         struct fw3_address ip_redir;
 315         struct fw3_port port_redir;
 316
 317         enum fw3_target target;
 318
 319         const char *extra;
 320
 321         bool reflection;
 322 };
 323
 324 struct fw3_forward
 325 {
 326         struct list_head list;
 327
 328         const char *name;
 329
 330         enum fw3_family family;
 331
 332         struct fw3_zone *_src;
 333         struct fw3_zone *_dest;
 334
 335         struct fw3_device src;
 336         struct fw3_device dest;
 337 };
 338
 339 struct fw3_ipset
 340 {
 341         struct list_head list;
 342
 343         const char *name;
 344         enum fw3_family family;
 345
 346         enum fw3_ipset_method method;
 347         struct list_head datatypes;
 348
 349         struct list_head iprange;
 350         struct fw3_port portrange;
 351
 352         int netmask;
 353         int maxelem;
 354         int hashsize;
 355
 356         int timeout;
 357
 358         const char *external;
 359 };
 360
 361 struct fw3_state
 362 {
 363         struct uci_context *uci;
 364         struct fw3_defaults defaults;
 365         struct list_head zones;
 366         struct list_head rules;
 367         struct list_head redirects;
 368         struct list_head forwards;
 369         struct list_head ipsets;
 370
 371         bool disable_ipsets;
 372 };
 373
 374
 375 struct fw3_option
 376 {
 377         const char *name;
 378         bool (*parse)(void *, const char *);
 379         uintptr_t offset;
 380         size_t elem_size;
 381 };
 382
 383 #define FW3_OPT(name, parse, structure, member) \
 384         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member) }
 385
 386 #define FW3_LIST(name, parse, structure, member) \
 387         { name, fw3_parse_##parse, offsetof(struct fw3_##structure, member), \
 388           sizeof(struct fw3_##structure) }
 389
 390
 391 bool fw3_parse_bool(void *ptr, const char *val);
 392 bool fw3_parse_int(void *ptr, const char *val);
 393 bool fw3_parse_string(void *ptr, const char *val);
 394 bool fw3_parse_target(void *ptr, const char *val);
 395 bool fw3_parse_limit(void *ptr, const char *val);
 396 bool fw3_parse_device(void *ptr, const char *val);
 397 bool fw3_parse_address(void *ptr, const char *val);
 398 bool fw3_parse_mac(void *ptr, const char *val);
 399 bool fw3_parse_port(void *ptr, const char *val);
 400 bool fw3_parse_family(void *ptr, const char *val);
 401 bool fw3_parse_icmptype(void *ptr, const char *val);
 402 bool fw3_parse_protocol(void *ptr, const char *val);
 403 bool fw3_parse_ipset_method(void *ptr, const char *val);
 404 bool fw3_parse_ipset_datatype(void *ptr, const char *val);
 405
 406 void fw3_parse_options(void *s, struct fw3_option *opts, int n,
 407                        struct uci_section *section);
 408
 409 void fw3_format_in_out(struct fw3_device *in, struct fw3_device *out);
 410 void fw3_format_src_dest(struct fw3_address *src, struct fw3_address *dest);
 411 void fw3_format_sport_dport(struct fw3_port *sp, struct fw3_port *dp);
 412 void fw3_format_mac(struct fw3_mac *mac);
 413 void fw3_format_protocol(struct fw3_protocol *proto, enum fw3_family family);
 414 void fw3_format_icmptype(struct fw3_icmptype *icmp, enum fw3_family family);
 415 void fw3_format_limit(struct fw3_limit *limit);
 416 void fw3_format_ipset(struct fw3_ipset *ipset, bool invert);
 417
 418 void __fw3_format_comment(const char *comment, ...);
 419 #define fw3_format_comment(...) __fw3_format_comment(__VA_ARGS__, NULL)
 420
 421 void fw3_format_extra(const char *extra);
 422
 423 #endif