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 <dlfcn.h>
  27 #include <unistd.h>
  28 #include <getopt.h>
  29 #include <sys/utsname.h>
  30
  31 #include "options.h"
  32
  33 /* xtables interface */
  34 #if (XTABLES_VERSION_CODE == 10)
  35 # include "xtables-10.h"
  36 #elif (XTABLES_VERSION_CODE == 5)
  37 # include "xtables-5.h"
  38 #else
  39 # error "Unsupported xtables version"
  40 #endif
  41
  42 /* libext.a interface */
  43 #define FW3_IPT_MODULES                 \
  44         __ipt_module(comment)           \
  45         __ipt_module(conntrack)         \
  46         __ipt_module(icmp)                      \
  47         __ipt_module(icmp6)                     \
  48         __ipt_module(limit)                     \
  49         __ipt_module(connlimit)                 \
  50         __ipt_module(mac)                       \
  51         __ipt_module(mark)                      \
  52         __ipt_module(set)                       \
  53         __ipt_module(standard)          \
  54         __ipt_module(tcp)                       \
  55         __ipt_module(time)                      \
  56         __ipt_module(udp)                       \
  57         __ipt_module(CT)                        \
  58         __ipt_module(DNAT)                      \
  59         __ipt_module(LOG)                       \
  60         __ipt_module(MARK)                      \
  61         __ipt_module(MASQUERADE)        \
  62         __ipt_module(REDIRECT)          \
  63         __ipt_module(REJECT)            \
  64         __ipt_module(SET)                       \
  65         __ipt_module(SNAT)                      \
  66         __ipt_module(TCPMSS)
  67
  68 #ifdef DISABLE_IPV6
  69 #undef __ipt_module
  70 #define __ipt_module(x) \
  71         extern void libxt_##x##_init(void) __attribute__((weak)); \
  72         extern void libipt_##x##_init(void) __attribute__((weak));
  73 #else
  74 #undef __ipt_module
  75 #define __ipt_module(x) \
  76         extern void libxt_##x##_init(void) __attribute__((weak)); \
  77         extern void libipt_##x##_init(void) __attribute__((weak)); \
  78         extern void libip6t_##x##_init(void) __attribute__((weak));
  79 #endif
  80
  81 FW3_IPT_MODULES
  82
  83
  84 /* Required by certain extensions like SNAT and DNAT */
  85 extern int kernel_version;
  86 void get_kernel_version(void);
  87
  88 struct fw3_ipt_handle {
  89         enum fw3_family family;
  90         enum fw3_table table;
  91         void *handle;
  92
  93         int libc;
  94         void **libv;
  95 };
  96
  97 struct fw3_ipt_rule {
  98         struct fw3_ipt_handle *h;
  99
 100         union {
 101                 struct ipt_entry e;
 102                 struct ip6t_entry e6;
 103         };
 104
 105         struct xtables_rule_match *matches;
 106         struct xtables_target *target;
 107
 108         int argc;
 109         char **argv;
 110
 111         uint32_t protocol;
 112         bool protocol_loaded;
 113 };
 114
 115 struct fw3_ipt_handle *fw3_ipt_open(enum fw3_family family,
 116                                     enum fw3_table table);
 117
 118 void fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
 119                         enum fw3_flag policy);
 120
 121
 122 void fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain);
 123 void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain);
 124
 125 void fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...);
 126
 127 void fw3_ipt_flush(struct fw3_ipt_handle *h);
 128
 129 void fw3_ipt_commit(struct fw3_ipt_handle *h);
 130
 131 void fw3_ipt_close(struct fw3_ipt_handle *h);
 132
 133 struct fw3_ipt_rule *fw3_ipt_rule_new(struct fw3_ipt_handle *h);
 134
 135 void fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto);
 136
 137 void fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 138                          struct fw3_device *in, struct fw3_device *out);
 139
 140 void fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 141                            struct fw3_address *src, struct fw3_address *dest);
 142
 143 void fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 144                               struct fw3_port *sp, struct fw3_port *dp);
 145
 146 void fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out);
 147
 148 void fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac);
 149
 150 void fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp);
 151
 152 void fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit);
 153
 154 void fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match);
 155
 156 void fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time);
 157
 158 void fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark);
 159
 160 void fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...);
 161
 162 void fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra);
 163
 164 void fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
 165                          const char *k, const char *v);
 166
 167 struct fw3_ipt_rule * fw3_ipt_rule_create(struct fw3_ipt_handle *handle,
 168                                           struct fw3_protocol *proto,
 169                                           struct fw3_device *in,
 170                                           struct fw3_device *out,
 171                                           struct fw3_address *src,
 172                                           struct fw3_address *dest);
 173
 174 void __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl,
 175                            const char *fmt, ...);
 176
 177 #define fw3_ipt_rule_append(rule, ...) \
 178         __fw3_ipt_rule_append(rule, false, __VA_ARGS__)
 179
 180 #define fw3_ipt_rule_replace(rule, ...) \
 181         __fw3_ipt_rule_append(rule, true, __VA_ARGS__)
 182
 183 static inline void
 184 fw3_ipt_rule_target(struct fw3_ipt_rule *r, const char *fmt, ...)
 185 {
 186         va_list ap;
 187         char buf[32];
 188
 189         va_start(ap, fmt);
 190         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 191         va_end(ap);
 192
 193         fw3_ipt_rule_addarg(r, false, "-j", buf);
 194 }
 195
 196 #endif