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 void init_extensions(void);
  38 void init_extensions4(void);
  39 void init_extensions6(void);
  40
  41 /* Required by certain extensions like SNAT and DNAT */
  42 extern int kernel_version;
  43 void get_kernel_version(void);
  44
  45 struct fw3_ipt_handle {
  46         enum fw3_family family;
  47         enum fw3_table table;
  48         struct xtc_handle *handle;
  49 };
  50
  51 struct fw3_ipt_rule {
  52         struct fw3_ipt_handle *h;
  53
  54         union {
  55                 struct ipt_entry e;
  56                 struct ip6t_entry e6;
  57         };
  58
  59         struct xtables_rule_match *matches;
  60         struct xtables_target *target;
  61
  62         int argc;
  63         char **argv;
  64
  65         uint32_t protocol;
  66         bool protocol_loaded;
  67 };
  68
  69 struct fw3_ipt_handle *fw3_ipt_open(enum fw3_family family,
  70                                     enum fw3_table table);
  71
  72 void fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
  73                         enum fw3_flag policy);
  74
  75 void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain);
  76 void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target);
  77
  78 static inline void
  79 fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
  80 {
  81         char buf[32];
  82         va_list ap;
  83
  84         va_start(ap, fmt);
  85         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
  86         va_end(ap);
  87
  88         if (fw3_pr_debug)
  89                 printf("-N %s\n", buf);
  90
  91         iptc_create_chain(buf, h->handle);
  92 }
  93
  94 void fw3_ipt_flush(struct fw3_ipt_handle *h);
  95
  96 void fw3_ipt_commit(struct fw3_ipt_handle *h);
  97
  98 struct fw3_ipt_rule *fw3_ipt_rule_new(struct fw3_ipt_handle *h);
  99
 100 void fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto);
 101
 102 void fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 103                          struct fw3_device *in, struct fw3_device *out);
 104
 105 void fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 106                            struct fw3_address *src, struct fw3_address *dest);
 107
 108 void fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 109                               struct fw3_port *sp, struct fw3_port *dp);
 110
 111 void fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac);
 112
 113 void fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp);
 114
 115 void fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit);
 116
 117 void fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_ipset *ipset,
 118                         bool invert);
 119
 120 void fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time);
 121
 122 void fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark);
 123
 124 void fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...);
 125
 126 void fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra);
 127
 128 void fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
 129                          const char *k, const char *v);
 130
 131 struct fw3_ipt_rule * fw3_ipt_rule_create(struct fw3_ipt_handle *handle,
 132                                           struct fw3_protocol *proto,
 133                                           struct fw3_device *in,
 134                                           struct fw3_device *out,
 135                                           struct fw3_address *src,
 136                                           struct fw3_address *dest);
 137
 138 void fw3_ipt_rule_append(struct fw3_ipt_rule *r, const char *fmt, ...);
 139
 140 static inline void
 141 fw3_ipt_rule_target(struct fw3_ipt_rule *r, const char *fmt, ...)
 142 {
 143         va_list ap;
 144         char buf[32];
 145
 146         va_start(ap, fmt);
 147         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 148         va_end(ap);
 149
 150         fw3_ipt_rule_addarg(r, false, "-j", buf);
 151 }
 152
 153 #endif