KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Shared library add-on to iptables to add TPROXY target support. |
| 3 | * |
| 4 | * Copyright (C) 2002-2008 BalaBit IT Ltd. |
| 5 | */ |
| 6 | #include <getopt.h> |
| 7 | #include <stdbool.h> |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 8 | #include <stdint.h> |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 9 | #include <stdio.h> |
| 10 | #include <string.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <limits.h> |
| 13 | |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 14 | #include <xtables.h> |
| 15 | #include <linux/netfilter/x_tables.h> |
| 16 | #include <linux/netfilter/xt_TPROXY.h> |
| 17 | |
| 18 | static const struct option tproxy_tg_opts[] = { |
Jan Engelhardt | 32b8e61 | 2010-07-23 21:16:14 +0200 | [diff] [blame] | 19 | {.name = "on-port", .has_arg = true, .val = '1'}, |
| 20 | {.name = "on-ip", .has_arg = true, .val = '2'}, |
| 21 | {.name = "tproxy-mark", .has_arg = true, .val = '3'}, |
| 22 | XT_GETOPT_TABLEEND, |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 23 | }; |
| 24 | |
| 25 | enum { |
| 26 | PARAM_ONPORT = 1 << 0, |
| 27 | PARAM_ONIP = 1 << 1, |
| 28 | PARAM_MARK = 1 << 2, |
| 29 | }; |
| 30 | |
| 31 | static void tproxy_tg_help(void) |
| 32 | { |
| 33 | printf( |
| 34 | "TPROXY target options:\n" |
| 35 | " --on-port port Redirect connection to port, or the original port if 0\n" |
| 36 | " --on-ip ip Optionally redirect to the given IP\n" |
| 37 | " --tproxy-mark value[/mask] Mark packets with the given value/mask\n\n"); |
| 38 | } |
| 39 | |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 40 | static void parse_tproxy_lport(const char *s, uint16_t *portp) |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 41 | { |
| 42 | unsigned int lport; |
| 43 | |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 44 | if (xtables_strtoui(s, NULL, &lport, 0, UINT16_MAX)) |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 45 | *portp = htons(lport); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 46 | else |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 47 | xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--on-port", s); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 48 | } |
| 49 | |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 50 | static void parse_tproxy_laddr(const char *s, union nf_inet_addr *addrp, |
| 51 | unsigned int nfproto) |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 52 | { |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 53 | struct in6_addr *laddr6 = NULL; |
| 54 | struct in_addr *laddr4 = NULL; |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 55 | |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 56 | if (nfproto == NFPROTO_IPV6) { |
| 57 | laddr6 = xtables_numeric_to_ip6addr(s); |
| 58 | if (laddr6 == NULL) |
| 59 | goto out; |
| 60 | addrp->in6 = *laddr6; |
| 61 | } else if (nfproto == NFPROTO_IPV4) { |
| 62 | laddr4 = xtables_numeric_to_ipaddr(s); |
| 63 | if (laddr4 == NULL) |
| 64 | goto out; |
| 65 | addrp->in = *laddr4; |
| 66 | } |
| 67 | return; |
| 68 | out: |
| 69 | xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--on-ip", s); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 70 | } |
| 71 | |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 72 | static void parse_tproxy_mark(char *s, uint32_t *markp, uint32_t *maskp) |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 73 | { |
Jan Engelhardt | a809754 | 2009-01-27 17:39:01 +0100 | [diff] [blame] | 74 | unsigned int value, mask = UINT32_MAX; |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 75 | char *end; |
| 76 | |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 77 | if (!xtables_strtoui(s, &end, &value, 0, UINT32_MAX)) |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 78 | xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--tproxy-mark", s); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 79 | if (*end == '/') |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 80 | if (!xtables_strtoui(end + 1, &end, &mask, 0, UINT32_MAX)) |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 81 | xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--tproxy-mark", s); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 82 | if (*end != '\0') |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 83 | xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--tproxy-mark", s); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 84 | |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 85 | *markp = value; |
| 86 | *maskp = mask; |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | static int tproxy_tg_parse(int c, char **argv, int invert, unsigned int *flags, |
| 90 | const void *entry, struct xt_entry_target **target) |
| 91 | { |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 92 | struct xt_tproxy_target_info *info = (void *)(*target)->data; |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 93 | |
| 94 | switch (c) { |
| 95 | case '1': |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 96 | xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--on-port", *flags & PARAM_ONPORT); |
| 97 | xtables_param_act(XTF_NO_INVERT, "TPROXY", "--on-port", invert); |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 98 | parse_tproxy_lport(optarg, &info->lport); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 99 | *flags |= PARAM_ONPORT; |
| 100 | return 1; |
| 101 | case '2': |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 102 | xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--on-ip", *flags & PARAM_ONIP); |
| 103 | xtables_param_act(XTF_NO_INVERT, "TPROXY", "--on-ip", invert); |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 104 | parse_tproxy_laddr(optarg, (void *)&info->laddr, NFPROTO_IPV4); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 105 | *flags |= PARAM_ONIP; |
| 106 | return 1; |
| 107 | case '3': |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 108 | xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--tproxy-mark", *flags & PARAM_MARK); |
| 109 | xtables_param_act(XTF_NO_INVERT, "TPROXY", "--tproxy-mark", invert); |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 110 | parse_tproxy_mark(optarg, &info->mark_value, &info->mark_mask); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 111 | *flags |= PARAM_MARK; |
| 112 | return 1; |
| 113 | } |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 118 | static int |
| 119 | tproxy_tg_parse1(int c, char **argv, int invert, unsigned int *flags, |
| 120 | struct xt_tproxy_target_info_v1 *info, unsigned int nfproto) |
| 121 | { |
| 122 | switch (c) { |
| 123 | case '1': |
| 124 | xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--on-port", *flags & PARAM_ONPORT); |
| 125 | xtables_param_act(XTF_NO_INVERT, "TPROXY", "--on-port", invert); |
| 126 | parse_tproxy_lport(optarg, &info->lport); |
| 127 | *flags |= PARAM_ONPORT; |
| 128 | return true; |
| 129 | case '2': |
| 130 | xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--on-ip", *flags & PARAM_ONIP); |
| 131 | xtables_param_act(XTF_NO_INVERT, "TPROXY", "--on-ip", invert); |
| 132 | parse_tproxy_laddr(optarg, (void *)&info->laddr, nfproto); |
| 133 | *flags |= PARAM_ONIP; |
| 134 | return true; |
| 135 | case '3': |
| 136 | xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--tproxy-mark", *flags & PARAM_MARK); |
| 137 | xtables_param_act(XTF_NO_INVERT, "TPROXY", "--tproxy-mark", invert); |
| 138 | parse_tproxy_mark(optarg, &info->mark_value, &info->mark_mask); |
| 139 | *flags |= PARAM_MARK; |
| 140 | return true; |
| 141 | } |
| 142 | return false; |
| 143 | } |
| 144 | |
| 145 | static int |
| 146 | tproxy_tg_parse4(int c, char **argv, int invert, unsigned int *flags, |
| 147 | const void *entry, struct xt_entry_target **target) |
| 148 | { |
| 149 | struct xt_tproxy_target_info_v1 *info = (void *)(*target)->data; |
| 150 | return tproxy_tg_parse1(c, argv, invert, flags, info, NFPROTO_IPV4); |
| 151 | } |
| 152 | |
| 153 | static int |
| 154 | tproxy_tg_parse6(int c, char **argv, int invert, unsigned int *flags, |
| 155 | const void *entry, struct xt_entry_target **target) |
| 156 | { |
| 157 | struct xt_tproxy_target_info_v1 *info = (void *)(*target)->data; |
| 158 | return tproxy_tg_parse1(c, argv, invert, flags, info, NFPROTO_IPV6); |
| 159 | } |
| 160 | |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 161 | static void tproxy_tg_check(unsigned int flags) |
| 162 | { |
| 163 | if (!(flags & PARAM_ONPORT)) |
Jan Engelhardt | 1829ed4 | 2009-02-21 03:29:44 +0100 | [diff] [blame] | 164 | xtables_error(PARAMETER_PROBLEM, |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 165 | "TPROXY target: Parameter --on-port is required"); |
| 166 | } |
| 167 | |
| 168 | static void tproxy_tg_print(const void *ip, const struct xt_entry_target *target, |
| 169 | int numeric) |
| 170 | { |
| 171 | const struct xt_tproxy_target_info *info = (const void *)target->data; |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame^] | 172 | printf(" TPROXY redirect %s:%u mark 0x%x/0x%x", |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 173 | xtables_ipaddr_to_numeric((const struct in_addr *)&info->laddr), |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 174 | ntohs(info->lport), (unsigned int)info->mark_value, |
| 175 | (unsigned int)info->mark_mask); |
| 176 | } |
| 177 | |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 178 | static void |
| 179 | tproxy_tg_print4(const void *ip, const struct xt_entry_target *target, |
| 180 | int numeric) |
| 181 | { |
| 182 | const struct xt_tproxy_target_info_v1 *info = |
| 183 | (const void *)target->data; |
| 184 | |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame^] | 185 | printf(" TPROXY redirect %s:%u mark 0x%x/0x%x", |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 186 | xtables_ipaddr_to_numeric(&info->laddr.in), |
| 187 | ntohs(info->lport), (unsigned int)info->mark_value, |
| 188 | (unsigned int)info->mark_mask); |
| 189 | } |
| 190 | |
| 191 | static void |
| 192 | tproxy_tg_print6(const void *ip, const struct xt_entry_target *target, |
| 193 | int numeric) |
| 194 | { |
| 195 | const struct xt_tproxy_target_info_v1 *info = |
| 196 | (const void *)target->data; |
| 197 | |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame^] | 198 | printf(" TPROXY redirect %s:%u mark 0x%x/0x%x", |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 199 | xtables_ip6addr_to_numeric(&info->laddr.in6), |
| 200 | ntohs(info->lport), (unsigned int)info->mark_value, |
| 201 | (unsigned int)info->mark_mask); |
| 202 | } |
| 203 | |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 204 | static void tproxy_tg_save(const void *ip, const struct xt_entry_target *target) |
| 205 | { |
| 206 | const struct xt_tproxy_target_info *info = (const void *)target->data; |
| 207 | |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame^] | 208 | printf(" --on-port %u", ntohs(info->lport)); |
| 209 | printf(" --on-ip %s", |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 210 | xtables_ipaddr_to_numeric((const struct in_addr *)&info->laddr)); |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame^] | 211 | printf(" --tproxy-mark 0x%x/0x%x", |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 212 | (unsigned int)info->mark_value, (unsigned int)info->mark_mask); |
| 213 | } |
| 214 | |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 215 | static void |
| 216 | tproxy_tg_save4(const void *ip, const struct xt_entry_target *target) |
| 217 | { |
| 218 | const struct xt_tproxy_target_info_v1 *info; |
| 219 | |
| 220 | info = (const void *)target->data; |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame^] | 221 | printf(" --on-port %u", ntohs(info->lport)); |
| 222 | printf(" --on-ip %s", xtables_ipaddr_to_numeric(&info->laddr.in)); |
| 223 | printf(" --tproxy-mark 0x%x/0x%x", |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 224 | (unsigned int)info->mark_value, (unsigned int)info->mark_mask); |
| 225 | } |
| 226 | |
| 227 | static void |
| 228 | tproxy_tg_save6(const void *ip, const struct xt_entry_target *target) |
| 229 | { |
| 230 | const struct xt_tproxy_target_info_v1 *info; |
| 231 | |
| 232 | info = (const void *)target->data; |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame^] | 233 | printf(" --on-port %u", ntohs(info->lport)); |
| 234 | printf(" --on-ip %s", xtables_ip6addr_to_numeric(&info->laddr.in6)); |
| 235 | printf(" --tproxy-mark 0x%x/0x%x", |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 236 | (unsigned int)info->mark_value, (unsigned int)info->mark_mask); |
| 237 | } |
| 238 | |
| 239 | static struct xtables_target tproxy_tg_reg[] = { |
| 240 | { |
| 241 | .name = "TPROXY", |
| 242 | .revision = 0, |
| 243 | .family = NFPROTO_IPV4, |
| 244 | .version = XTABLES_VERSION, |
| 245 | .size = XT_ALIGN(sizeof(struct xt_tproxy_target_info)), |
| 246 | .userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info)), |
| 247 | .help = tproxy_tg_help, |
| 248 | .parse = tproxy_tg_parse, |
| 249 | .final_check = tproxy_tg_check, |
| 250 | .print = tproxy_tg_print, |
| 251 | .save = tproxy_tg_save, |
| 252 | .extra_opts = tproxy_tg_opts, |
| 253 | }, |
| 254 | { |
| 255 | .name = "TPROXY", |
| 256 | .revision = 1, |
| 257 | .family = NFPROTO_IPV4, |
| 258 | .version = XTABLES_VERSION, |
| 259 | .size = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)), |
| 260 | .userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)), |
| 261 | .help = tproxy_tg_help, |
| 262 | .parse = tproxy_tg_parse4, |
| 263 | .final_check = tproxy_tg_check, |
| 264 | .print = tproxy_tg_print4, |
| 265 | .save = tproxy_tg_save4, |
| 266 | .extra_opts = tproxy_tg_opts, |
| 267 | }, |
| 268 | { |
| 269 | .name = "TPROXY", |
| 270 | .revision = 1, |
| 271 | .family = NFPROTO_IPV6, |
| 272 | .version = XTABLES_VERSION, |
| 273 | .size = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)), |
| 274 | .userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)), |
| 275 | .help = tproxy_tg_help, |
| 276 | .parse = tproxy_tg_parse6, |
| 277 | .final_check = tproxy_tg_check, |
| 278 | .print = tproxy_tg_print6, |
| 279 | .save = tproxy_tg_save6, |
| 280 | .extra_opts = tproxy_tg_opts, |
| 281 | }, |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 282 | }; |
| 283 | |
| 284 | void _init(void) |
| 285 | { |
Jan Engelhardt | 9e152fa | 2010-12-03 22:08:32 +0100 | [diff] [blame] | 286 | xtables_register_targets(tproxy_tg_reg, ARRAY_SIZE(tproxy_tg_reg)); |
KOVACS Krisztian | 92b54aa | 2008-10-15 11:49:37 +0200 | [diff] [blame] | 287 | } |