Harald Welte | 18f1aff | 2001-03-25 19:03:23 +0000 | [diff] [blame] | 1 | /* Shared library add-on to iptables to add simple non load-balancing SNAT support. */ |
Jan Engelhardt | 32b8e61 | 2010-07-23 21:16:14 +0200 | [diff] [blame] | 2 | #include <stdbool.h> |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 3 | #include <stdio.h> |
| 4 | #include <netdb.h> |
| 5 | #include <string.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <getopt.h> |
Jan Engelhardt | 5d9678a | 2008-11-20 10:15:35 +0100 | [diff] [blame] | 8 | #include <xtables.h> |
Jan Engelhardt | 978e27e | 2009-02-21 04:42:32 +0100 | [diff] [blame] | 9 | #include <net/netfilter/nf_nat.h> |
Martin Josefsson | 1eb0081 | 2004-05-26 15:58:07 +0000 | [diff] [blame] | 10 | /* For 64bit kernel / 32bit userspace */ |
Jan Engelhardt | a2a7f2b | 2008-09-01 14:20:13 +0200 | [diff] [blame] | 11 | #include <linux/netfilter_ipv4/ipt_SAME.h> |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 12 | |
Jan Engelhardt | 1d5b63d | 2007-10-04 16:29:00 +0000 | [diff] [blame] | 13 | static void SAME_help(void) |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 14 | { |
| 15 | printf( |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 16 | "SAME target options:\n" |
Harald Welte | 18f1aff | 2001-03-25 19:03:23 +0000 | [diff] [blame] | 17 | " --to <ipaddr>-<ipaddr>\n" |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 18 | " Addresses to map source to.\n" |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 19 | " May be specified more than\n" |
| 20 | " once for multiple ranges.\n" |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 21 | " --nodst\n" |
| 22 | " Don't use destination-ip in\n" |
Eric Leblond | ae4b0b3 | 2007-02-24 15:11:33 +0000 | [diff] [blame] | 23 | " source selection\n" |
Eric Leblond | ae4b0b3 | 2007-02-24 15:11:33 +0000 | [diff] [blame] | 24 | " --random\n" |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 25 | " Randomize source port\n"); |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 26 | } |
| 27 | |
Jan Engelhardt | 1d5b63d | 2007-10-04 16:29:00 +0000 | [diff] [blame] | 28 | static const struct option SAME_opts[] = { |
Jan Engelhardt | 32b8e61 | 2010-07-23 21:16:14 +0200 | [diff] [blame] | 29 | {.name = "to", .has_arg = true, .val = '1'}, |
| 30 | {.name = "nodst", .has_arg = false, .val = '2'}, |
| 31 | {.name = "random", .has_arg = false, .val = '3'}, |
| 32 | XT_GETOPT_TABLEEND, |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 33 | }; |
| 34 | |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 35 | /* Parses range of IPs */ |
| 36 | static void |
Jan Engelhardt | 978e27e | 2009-02-21 04:42:32 +0100 | [diff] [blame] | 37 | parse_to(char *arg, struct nf_nat_range *range) |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 38 | { |
| 39 | char *dash; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 40 | const struct in_addr *ip; |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 41 | |
| 42 | range->flags |= IP_NAT_RANGE_MAP_IPS; |
| 43 | dash = strchr(arg, '-'); |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 44 | |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 45 | if (dash) |
| 46 | *dash = '\0'; |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 47 | |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 48 | ip = xtables_numeric_to_ipaddr(arg); |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 49 | if (!ip) |
Jan Engelhardt | 1829ed4 | 2009-02-21 03:29:44 +0100 | [diff] [blame] | 50 | xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n", |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 51 | arg); |
| 52 | range->min_ip = ip->s_addr; |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 53 | |
| 54 | if (dash) { |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 55 | ip = xtables_numeric_to_ipaddr(dash+1); |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 56 | if (!ip) |
Jan Engelhardt | 1829ed4 | 2009-02-21 03:29:44 +0100 | [diff] [blame] | 57 | xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n", |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 58 | dash+1); |
| 59 | } |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 60 | range->max_ip = ip->s_addr; |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 61 | if (dash) |
| 62 | if (range->min_ip > range->max_ip) |
Jan Engelhardt | 1829ed4 | 2009-02-21 03:29:44 +0100 | [diff] [blame] | 63 | xtables_error(PARAMETER_PROBLEM, "Bad IP range \"%s-%s\"\n", |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 64 | arg, dash+1); |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 65 | } |
| 66 | |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 67 | #define IPT_SAME_OPT_TO 0x01 |
| 68 | #define IPT_SAME_OPT_NODST 0x02 |
Patrick McHardy | e656e26 | 2007-04-18 12:56:05 +0000 | [diff] [blame] | 69 | #define IPT_SAME_OPT_RANDOM 0x04 |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 70 | |
Jan Engelhardt | 1d5b63d | 2007-10-04 16:29:00 +0000 | [diff] [blame] | 71 | static int SAME_parse(int c, char **argv, int invert, unsigned int *flags, |
| 72 | const void *entry, struct xt_entry_target **target) |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 73 | { |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 74 | struct ipt_same_info *mr |
| 75 | = (struct ipt_same_info *)(*target)->data; |
Jan Engelhardt | 7a236f4 | 2008-03-03 12:30:41 +0100 | [diff] [blame] | 76 | unsigned int count; |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 77 | |
| 78 | switch (c) { |
| 79 | case '1': |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 80 | if (mr->rangesize == IPT_SAME_MAX_RANGE) |
Jan Engelhardt | 1829ed4 | 2009-02-21 03:29:44 +0100 | [diff] [blame] | 81 | xtables_error(PARAMETER_PROBLEM, |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 82 | "Too many ranges specified, maximum " |
| 83 | "is %i ranges.\n", |
| 84 | IPT_SAME_MAX_RANGE); |
Jan Engelhardt | bf97128 | 2009-11-03 19:55:11 +0100 | [diff] [blame] | 85 | if (xtables_check_inverse(optarg, &invert, NULL, 0, argv)) |
Jan Engelhardt | 1829ed4 | 2009-02-21 03:29:44 +0100 | [diff] [blame] | 86 | xtables_error(PARAMETER_PROBLEM, |
Harald Welte | 18f1aff | 2001-03-25 19:03:23 +0000 | [diff] [blame] | 87 | "Unexpected `!' after --to"); |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 88 | |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 89 | parse_to(optarg, &mr->range[mr->rangesize]); |
Patrick McHardy | e656e26 | 2007-04-18 12:56:05 +0000 | [diff] [blame] | 90 | /* WTF do we need this for? */ |
Eric Leblond | ae4b0b3 | 2007-02-24 15:11:33 +0000 | [diff] [blame] | 91 | if (*flags & IPT_SAME_OPT_RANDOM) |
| 92 | mr->range[mr->rangesize].flags |
| 93 | |= IP_NAT_RANGE_PROTO_RANDOM; |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 94 | mr->rangesize++; |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 95 | *flags |= IPT_SAME_OPT_TO; |
| 96 | break; |
| 97 | |
| 98 | case '2': |
| 99 | if (*flags & IPT_SAME_OPT_NODST) |
Jan Engelhardt | 1829ed4 | 2009-02-21 03:29:44 +0100 | [diff] [blame] | 100 | xtables_error(PARAMETER_PROBLEM, |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 101 | "Can't specify --nodst twice"); |
| 102 | |
| 103 | mr->info |= IPT_SAME_NODST; |
| 104 | *flags |= IPT_SAME_OPT_NODST; |
| 105 | break; |
Eric Leblond | ae4b0b3 | 2007-02-24 15:11:33 +0000 | [diff] [blame] | 106 | |
Eric Leblond | ae4b0b3 | 2007-02-24 15:11:33 +0000 | [diff] [blame] | 107 | case '3': |
| 108 | *flags |= IPT_SAME_OPT_RANDOM; |
| 109 | for (count=0; count < mr->rangesize; count++) |
| 110 | mr->range[count].flags |= IP_NAT_RANGE_PROTO_RANDOM; |
| 111 | break; |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 112 | } |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 113 | |
| 114 | return 1; |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 115 | } |
| 116 | |
Jan Engelhardt | 1d5b63d | 2007-10-04 16:29:00 +0000 | [diff] [blame] | 117 | static void SAME_check(unsigned int flags) |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 118 | { |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 119 | if (!(flags & IPT_SAME_OPT_TO)) |
Jan Engelhardt | 1829ed4 | 2009-02-21 03:29:44 +0100 | [diff] [blame] | 120 | xtables_error(PARAMETER_PROBLEM, |
Harald Welte | 18f1aff | 2001-03-25 19:03:23 +0000 | [diff] [blame] | 121 | "SAME needs --to"); |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 122 | } |
| 123 | |
Jan Engelhardt | 1d5b63d | 2007-10-04 16:29:00 +0000 | [diff] [blame] | 124 | static void SAME_print(const void *ip, const struct xt_entry_target *target, |
| 125 | int numeric) |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 126 | { |
Jan Engelhardt | 7a236f4 | 2008-03-03 12:30:41 +0100 | [diff] [blame] | 127 | unsigned int count; |
Jan Engelhardt | 69f564e | 2009-05-26 13:14:06 +0200 | [diff] [blame] | 128 | const struct ipt_same_info *mr = (const void *)target->data; |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 129 | int random_selection = 0; |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 130 | |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 131 | printf(" same:"); |
| 132 | |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 133 | for (count = 0; count < mr->rangesize; count++) { |
Jan Engelhardt | 69f564e | 2009-05-26 13:14:06 +0200 | [diff] [blame] | 134 | const struct nf_nat_range *r = &mr->range[count]; |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 135 | struct in_addr a; |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 136 | |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 137 | a.s_addr = r->min_ip; |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 138 | |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 139 | printf("%s", xtables_ipaddr_to_numeric(&a)); |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 140 | a.s_addr = r->max_ip; |
| 141 | |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 142 | if (r->min_ip != r->max_ip) |
| 143 | printf("-%s", xtables_ipaddr_to_numeric(&a)); |
Eric Leblond | ae4b0b3 | 2007-02-24 15:11:33 +0000 | [diff] [blame] | 144 | if (r->flags & IP_NAT_RANGE_PROTO_RANDOM) |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 145 | random_selection = 1; |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 146 | } |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 147 | |
| 148 | if (mr->info & IPT_SAME_NODST) |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 149 | printf(" nodst"); |
Eric Leblond | ae4b0b3 | 2007-02-24 15:11:33 +0000 | [diff] [blame] | 150 | |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 151 | if (random_selection) |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 152 | printf(" random"); |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 153 | } |
| 154 | |
Jan Engelhardt | 1d5b63d | 2007-10-04 16:29:00 +0000 | [diff] [blame] | 155 | static void SAME_save(const void *ip, const struct xt_entry_target *target) |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 156 | { |
Jan Engelhardt | 7a236f4 | 2008-03-03 12:30:41 +0100 | [diff] [blame] | 157 | unsigned int count; |
Jan Engelhardt | 69f564e | 2009-05-26 13:14:06 +0200 | [diff] [blame] | 158 | const struct ipt_same_info *mr = (const void *)target->data; |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 159 | int random_selection = 0; |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 160 | |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 161 | for (count = 0; count < mr->rangesize; count++) { |
Jan Engelhardt | 69f564e | 2009-05-26 13:14:06 +0200 | [diff] [blame] | 162 | const struct nf_nat_range *r = &mr->range[count]; |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 163 | struct in_addr a; |
| 164 | |
| 165 | a.s_addr = r->min_ip; |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 166 | printf(" --to %s", xtables_ipaddr_to_numeric(&a)); |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 167 | a.s_addr = r->max_ip; |
| 168 | |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 169 | if (r->min_ip != r->max_ip) |
| 170 | printf("-%s", xtables_ipaddr_to_numeric(&a)); |
Patrick McHardy | 9c67def | 2007-04-18 14:00:11 +0000 | [diff] [blame] | 171 | if (r->flags & IP_NAT_RANGE_PROTO_RANDOM) |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 172 | random_selection = 1; |
Harald Welte | 05e0b01 | 2001-08-26 08:18:25 +0000 | [diff] [blame] | 173 | } |
Harald Welte | cf655eb | 2001-07-28 18:47:11 +0000 | [diff] [blame] | 174 | |
| 175 | if (mr->info & IPT_SAME_NODST) |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 176 | printf(" --nodst"); |
Patrick McHardy | 9c67def | 2007-04-18 14:00:11 +0000 | [diff] [blame] | 177 | |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 178 | if (random_selection) |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 179 | printf(" --random"); |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 180 | } |
| 181 | |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 182 | static struct xtables_target same_tg_reg = { |
Pablo Neira | 8caee8b | 2004-12-28 13:11:59 +0000 | [diff] [blame] | 183 | .name = "SAME", |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 184 | .version = XTABLES_VERSION, |
Jan Engelhardt | 03d9948 | 2008-11-18 12:27:54 +0100 | [diff] [blame] | 185 | .family = NFPROTO_IPV4, |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 186 | .size = XT_ALIGN(sizeof(struct ipt_same_info)), |
| 187 | .userspacesize = XT_ALIGN(sizeof(struct ipt_same_info)), |
Jan Engelhardt | 1d5b63d | 2007-10-04 16:29:00 +0000 | [diff] [blame] | 188 | .help = SAME_help, |
Jan Engelhardt | 1d5b63d | 2007-10-04 16:29:00 +0000 | [diff] [blame] | 189 | .parse = SAME_parse, |
| 190 | .final_check = SAME_check, |
| 191 | .print = SAME_print, |
| 192 | .save = SAME_save, |
| 193 | .extra_opts = SAME_opts, |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 194 | }; |
| 195 | |
| 196 | void _init(void) |
| 197 | { |
Jan Engelhardt | 8b7c64d | 2008-04-15 11:48:25 +0200 | [diff] [blame] | 198 | xtables_register_target(&same_tg_reg); |
Martin Josefsson | f419f75 | 2001-02-19 21:55:27 +0000 | [diff] [blame] | 199 | } |