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