[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/iptables/extensions/libipt_NETMAP.c b/ap/app/iptables/extensions/libipt_NETMAP.c
new file mode 100755
index 0000000..9820230
--- /dev/null
+++ b/ap/app/iptables/extensions/libipt_NETMAP.c
@@ -0,0 +1,183 @@
+/* Shared library add-on to iptables to add static NAT support.
+ Author: Svenning Soerensen <svenning@post5.tele.dk>
+*/
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <xtables.h>
+#include <net/netfilter/nf_nat.h>
+
+#define MODULENAME "NETMAP"
+
+static const struct option NETMAP_opts[] = {
+ { "to", 1, NULL, '1' },
+ { .name = NULL }
+};
+
+static void NETMAP_help(void)
+{
+ printf(MODULENAME" target options:\n"
+ " --%s address[/mask]\n"
+ " Network address to map to.\n\n",
+ NETMAP_opts[0].name);
+}
+
+static u_int32_t
+bits2netmask(int bits)
+{
+ u_int32_t netmask, bm;
+
+ if (bits >= 32 || bits < 0)
+ return(~0);
+ for (netmask = 0, bm = 0x80000000; bits; bits--, bm >>= 1)
+ netmask |= bm;
+ return htonl(netmask);
+}
+
+static int
+netmask2bits(u_int32_t netmask)
+{
+ u_int32_t bm;
+ int bits;
+
+ netmask = ntohl(netmask);
+ for (bits = 0, bm = 0x80000000; netmask & bm; netmask <<= 1)
+ bits++;
+ if (netmask)
+ return -1; /* holes in netmask */
+ return bits;
+}
+
+static void NETMAP_init(struct xt_entry_target *t)
+{
+ struct nf_nat_multi_range *mr = (struct nf_nat_multi_range *)t->data;
+
+ /* Actually, it's 0, but it's ignored at the moment. */
+ mr->rangesize = 1;
+
+}
+
+/* Parses network address */
+static void
+parse_to(char *arg, struct nf_nat_range *range)
+{
+ char *slash;
+ const struct in_addr *ip;
+ u_int32_t netmask;
+ unsigned int bits;
+
+ range->flags |= IP_NAT_RANGE_MAP_IPS;
+ slash = strchr(arg, '/');
+ if (slash)
+ *slash = '\0';
+
+ ip = xtables_numeric_to_ipaddr(arg);
+ if (!ip)
+ xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n",
+ arg);
+ range->min_ip = ip->s_addr;
+ if (slash) {
+ if (strchr(slash+1, '.')) {
+ ip = xtables_numeric_to_ipmask(slash+1);
+ if (!ip)
+ xtables_error(PARAMETER_PROBLEM, "Bad netmask \"%s\"\n",
+ slash+1);
+ netmask = ip->s_addr;
+ }
+ else {
+ if (!xtables_strtoui(slash+1, NULL, &bits, 0, 32))
+ xtables_error(PARAMETER_PROBLEM, "Bad netmask \"%s\"\n",
+ slash+1);
+ netmask = bits2netmask(bits);
+ }
+ /* Don't allow /0 (/1 is probably insane, too) */
+ if (netmask == 0)
+ xtables_error(PARAMETER_PROBLEM, "Netmask needed\n");
+ }
+ else
+ netmask = ~0;
+
+ if (range->min_ip & ~netmask) {
+ if (slash)
+ *slash = '/';
+ xtables_error(PARAMETER_PROBLEM, "Bad network address \"%s\"\n",
+ arg);
+ }
+ range->max_ip = range->min_ip | ~netmask;
+}
+
+static int NETMAP_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
+{
+ struct nf_nat_multi_range *mr
+ = (struct nf_nat_multi_range *)(*target)->data;
+
+ switch (c) {
+ case '1':
+ if (xtables_check_inverse(optarg, &invert, NULL, 0))
+ xtables_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --%s", NETMAP_opts[0].name);
+
+ parse_to(optarg, &mr->range[0]);
+ *flags = 1;
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static void NETMAP_check(unsigned int flags)
+{
+ if (!flags)
+ xtables_error(PARAMETER_PROBLEM,
+ MODULENAME" needs --%s", NETMAP_opts[0].name);
+}
+
+static void NETMAP_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ struct nf_nat_multi_range *mr
+ = (struct nf_nat_multi_range *)target->data;
+ struct nf_nat_range *r = &mr->range[0];
+ struct in_addr a;
+ int bits;
+
+ a.s_addr = r->min_ip;
+ printf("%s", xtables_ipaddr_to_numeric(&a));
+ a.s_addr = ~(r->min_ip ^ r->max_ip);
+ bits = netmask2bits(a.s_addr);
+ if (bits < 0)
+ printf("/%s", xtables_ipaddr_to_numeric(&a));
+ else
+ printf("/%d", bits);
+}
+
+static void NETMAP_save(const void *ip, const struct xt_entry_target *target)
+{
+ printf("--%s ", NETMAP_opts[0].name);
+ NETMAP_print(ip, target, 0);
+}
+
+static struct xtables_target netmap_tg_reg = {
+ .name = MODULENAME,
+ .version = XTABLES_VERSION,
+ .family = NFPROTO_IPV4,
+ .size = XT_ALIGN(sizeof(struct nf_nat_multi_range)),
+ .userspacesize = XT_ALIGN(sizeof(struct nf_nat_multi_range)),
+ .help = NETMAP_help,
+ .init = NETMAP_init,
+ .parse = NETMAP_parse,
+ .final_check = NETMAP_check,
+ .print = NETMAP_print,
+ .save = NETMAP_save,
+ .extra_opts = NETMAP_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&netmap_tg_reg);
+}