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path: root/polux/application/iptables/extensions/libipt_SAME.c
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Diffstat (limited to 'polux/application/iptables/extensions/libipt_SAME.c')
-rw-r--r--polux/application/iptables/extensions/libipt_SAME.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/polux/application/iptables/extensions/libipt_SAME.c b/polux/application/iptables/extensions/libipt_SAME.c
new file mode 100644
index 0000000000..4eda223772
--- /dev/null
+++ b/polux/application/iptables/extensions/libipt_SAME.c
@@ -0,0 +1,208 @@
+/* Shared library add-on to iptables to add simple non load-balancing SNAT support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+/* For 64bit kernel / 32bit userspace */
+#include "../include/linux/netfilter_ipv4/ipt_SAME.h"
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"SAME v%s options:\n"
+" --to <ipaddr>-<ipaddr>\n"
+" Addresses to map source to.\n"
+" May be specified more than\n"
+" once for multiple ranges.\n"
+" --nodst\n"
+" Don't use destination-ip in\n"
+" source selection\n",
+IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+ { "to", 1, 0, '1' },
+ { "nodst", 0, 0, '2'},
+ { 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+ struct ipt_same_info *mr = (struct ipt_same_info *)t->data;
+
+ /* Set default to 0 */
+ mr->rangesize = 0;
+ mr->info = 0;
+ mr->ipnum = 0;
+
+}
+
+/* Parses range of IPs */
+static void
+parse_to(char *arg, struct ip_nat_range *range)
+{
+ char *dash;
+ struct in_addr *ip;
+
+ range->flags |= IP_NAT_RANGE_MAP_IPS;
+ dash = strchr(arg, '-');
+
+ if (dash)
+ *dash = '\0';
+
+ ip = dotted_to_addr(arg);
+ if (!ip)
+ exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n",
+ arg);
+ range->min_ip = ip->s_addr;
+
+ if (dash) {
+ ip = dotted_to_addr(dash+1);
+ if (!ip)
+ exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n",
+ dash+1);
+ }
+ range->max_ip = ip->s_addr;
+ if (dash)
+ if (range->min_ip > range->max_ip)
+ exit_error(PARAMETER_PROBLEM, "Bad IP range `%s-%s'\n",
+ arg, dash+1);
+}
+
+#define IPT_SAME_OPT_TO 0x01
+#define IPT_SAME_OPT_NODST 0x02
+
+/* Function which parses command options; returns true if it
+ ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+ const struct ipt_entry *entry,
+ struct ipt_entry_target **target)
+{
+ struct ipt_same_info *mr
+ = (struct ipt_same_info *)(*target)->data;
+
+ switch (c) {
+ case '1':
+ if (mr->rangesize == IPT_SAME_MAX_RANGE)
+ exit_error(PARAMETER_PROBLEM,
+ "Too many ranges specified, maximum "
+ "is %i ranges.\n",
+ IPT_SAME_MAX_RANGE);
+ if (check_inverse(optarg, &invert, NULL, 0))
+ exit_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --to");
+
+ parse_to(optarg, &mr->range[mr->rangesize]);
+ mr->rangesize++;
+ *flags |= IPT_SAME_OPT_TO;
+ break;
+
+ case '2':
+ if (*flags & IPT_SAME_OPT_NODST)
+ exit_error(PARAMETER_PROBLEM,
+ "Can't specify --nodst twice");
+
+ mr->info |= IPT_SAME_NODST;
+ *flags |= IPT_SAME_OPT_NODST;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Final check; need --to. */
+static void final_check(unsigned int flags)
+{
+ if (!(flags & IPT_SAME_OPT_TO))
+ exit_error(PARAMETER_PROBLEM,
+ "SAME needs --to");
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+ const struct ipt_entry_target *target,
+ int numeric)
+{
+ int count;
+ struct ipt_same_info *mr
+ = (struct ipt_same_info *)target->data;
+
+ printf("same:");
+
+ for (count = 0; count < mr->rangesize; count++) {
+ struct ip_nat_range *r = &mr->range[count];
+ struct in_addr a;
+
+ a.s_addr = r->min_ip;
+
+ printf("%s", addr_to_dotted(&a));
+ a.s_addr = r->max_ip;
+
+ if (r->min_ip == r->max_ip)
+ printf(" ");
+ else
+ printf("-%s ", addr_to_dotted(&a));
+ }
+
+ if (mr->info & IPT_SAME_NODST)
+ printf("nodst ");
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+ int count;
+ struct ipt_same_info *mr
+ = (struct ipt_same_info *)target->data;
+
+ for (count = 0; count < mr->rangesize; count++) {
+ struct ip_nat_range *r = &mr->range[count];
+ struct in_addr a;
+
+ a.s_addr = r->min_ip;
+ printf("--to %s", addr_to_dotted(&a));
+ a.s_addr = r->max_ip;
+
+ if (r->min_ip == r->max_ip)
+ printf(" ");
+ else
+ printf("-%s ", addr_to_dotted(&a));
+ }
+
+ if (mr->info & IPT_SAME_NODST)
+ printf("--nodst ");
+}
+
+static struct iptables_target same = {
+ .next = NULL,
+ .name = "SAME",
+ .version = IPTABLES_VERSION,
+ .size = IPT_ALIGN(sizeof(struct ipt_same_info)),
+ .userspacesize = IPT_ALIGN(sizeof(struct ipt_same_info)),
+ .help = &help,
+ .init = &init,
+ .parse = &parse,
+ .final_check = &final_check,
+ .print = &print,
+ .save = &save,
+ .extra_opts = opts
+};
+
+void _init(void)
+{
+ register_target(&same);
+}