iptables.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_IPTABLES_H
  20 #define __FW3_IPTABLES_H
  21
  22 #include <libiptc/libiptc.h>
  23 #include <libiptc/libip6tc.h>
  24 #include <xtables.h>
  25
  26 #include <unistd.h>
  27 #include <getopt.h>
  28 #include <sys/utsname.h>
  29
  30 #include "options.h"
  31
  32 /* xtables interface */
  33 #if (XTABLES_VERSION_CODE == 10)
  34 # include "xtables-10.h"
  35 #elif (XTABLES_VERSION_CODE == 5)
  36 # include "xtables-5.h"
  37 #else
  38 # error "Unsupported xtables version"
  39 #endif
  40
  41 /* libext.a interface */
  42 #define FW3_IPT_MODULES                 \
  43         __ipt_module(comment)           \
  44         __ipt_module(conntrack)         \
  45         __ipt_module(icmp)                      \
  46         __ipt_module(icmp6)                     \
  47         __ipt_module(limit)                     \
  48         __ipt_module(mac)                       \
  49         __ipt_module(mark)                      \
  50         __ipt_module(set)                       \
  51         __ipt_module(standard)          \
  52         __ipt_module(tcp)                       \
  53         __ipt_module(time)                      \
  54         __ipt_module(udp)                       \
  55         __ipt_module(CT)                        \
  56         __ipt_module(DNAT)                      \
  57         __ipt_module(LOG)                       \
  58         __ipt_module(MARK)                      \
  59         __ipt_module(MASQUERADE)        \
  60         __ipt_module(REDIRECT)          \
  61         __ipt_module(REJECT)            \
  62         __ipt_module(SET)                       \
  63         __ipt_module(SNAT)                      \
  64         __ipt_module(TCPMSS)
  65
  66 #ifdef DISABLE_IPV6
  67 #undef __ipt_module
  68 #define __ipt_module(x) \
  69         extern void libxt_##x##_init(void) __attribute__((weak)); \
  70         extern void libipt_##x##_init(void) __attribute__((weak));
  71 #else
  72 #undef __ipt_module
  73 #define __ipt_module(x) \
  74         extern void libxt_##x##_init(void) __attribute__((weak)); \
  75         extern void libipt_##x##_init(void) __attribute__((weak)); \
  76         extern void libip6t_##x##_init(void) __attribute__((weak));
  77 #endif
  78
  79 FW3_IPT_MODULES
  80
  81
  82 /* Required by certain extensions like SNAT and DNAT */
  83 extern int kernel_version;
  84 void get_kernel_version(void);
  85
  86 struct fw3_ipt_handle {
  87         enum fw3_family family;
  88         enum fw3_table table;
  89         void *handle;
  90 };
  91
  92 struct fw3_ipt_rule {
  93         struct fw3_ipt_handle *h;
  94
  95         union {
  96                 struct ipt_entry e;
  97                 struct ip6t_entry e6;
  98         };
  99
 100         struct xtables_rule_match *matches;
 101         struct xtables_target *target;
 102
 103         int argc;
 104         char **argv;
 105
 106         uint32_t protocol;
 107         bool protocol_loaded;
 108 };
 109
 110 struct fw3_ipt_handle *fw3_ipt_open(enum fw3_family family,
 111                                     enum fw3_table table);
 112
 113 void fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
 114                         enum fw3_flag policy);
 115
 116 void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain);
 117 void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target);
 118
 119 void fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...);
 120
 121 void fw3_ipt_flush(struct fw3_ipt_handle *h);
 122
 123 void fw3_ipt_commit(struct fw3_ipt_handle *h);
 124
 125 struct fw3_ipt_rule *fw3_ipt_rule_new(struct fw3_ipt_handle *h);
 126
 127 void fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto);
 128
 129 void fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 130                          struct fw3_device *in, struct fw3_device *out);
 131
 132 void fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 133                            struct fw3_address *src, struct fw3_address *dest);
 134
 135 void fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 136                               struct fw3_port *sp, struct fw3_port *dp);
 137
 138 void fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac);
 139
 140 void fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp);
 141
 142 void fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit);
 143
 144 void fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_ipset *ipset,
 145                         bool invert);
 146
 147 void fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time);
 148
 149 void fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark);
 150
 151 void fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...);
 152
 153 void fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra);
 154
 155 void fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
 156                          const char *k, const char *v);
 157
 158 struct fw3_ipt_rule * fw3_ipt_rule_create(struct fw3_ipt_handle *handle,
 159                                           struct fw3_protocol *proto,
 160                                           struct fw3_device *in,
 161                                           struct fw3_device *out,
 162                                           struct fw3_address *src,
 163                                           struct fw3_address *dest);
 164
 165 void fw3_ipt_rule_append(struct fw3_ipt_rule *r, const char *fmt, ...);
 166
 167 static inline void
 168 fw3_ipt_rule_target(struct fw3_ipt_rule *r, const char *fmt, ...)
 169 {
 170         va_list ap;
 171         char buf[32];
 172
 173         va_start(ap, fmt);
 174         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 175         va_end(ap);
 176
 177         fw3_ipt_rule_addarg(r, false, "-j", buf);
 178 }
 179
 180 #endif