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