From: Patrick McHardy <kaber@xxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
extensions/libip6t_NETMAP.c | 93 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 93 insertions(+), 0 deletions(-)
create mode 100644 extensions/libip6t_NETMAP.c
diff --git a/extensions/libip6t_NETMAP.c b/extensions/libip6t_NETMAP.c
new file mode 100644
index 0000000..d14dece
--- /dev/null
+++ b/extensions/libip6t_NETMAP.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@xxxxxxxxx>
+ *
+ * Based on Svenning Soerensen's IPv4 NETMAP target. Development of IPv6 NAT
+ * funded by Astaro.
+ */
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <xtables.h>
+#include <libiptc/libip6tc.h>
+#include <linux/netfilter/nf_nat.h>
+
+#define MODULENAME "NETMAP"
+
+enum {
+ O_TO = 0,
+};
+
+static const struct xt_option_entry NETMAP_opts[] = {
+ {.name = "to", .id = O_TO, .type = XTTYPE_HOSTMASK,
+ .flags = XTOPT_MAND},
+ XTOPT_TABLEEND,
+};
+
+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 void NETMAP_parse(struct xt_option_call *cb)
+{
+ struct nf_nat_range *range = cb->data;
+ unsigned int i;
+
+ xtables_option_parse(cb);
+ range->flags |= NF_NAT_RANGE_MAP_IPS;
+ for (i = 0; i < 4; i++) {
+ range->min_addr.ip6[i] = cb->val.haddr.ip6[i] &
+ cb->val.hmask.ip6[i];
+ range->max_addr.ip6[i] = range->min_addr.ip6[i] |
+ ~cb->val.hmask.ip6[i];
+ }
+}
+
+static void NETMAP_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ const struct nf_nat_range *r = (const void *)target->data;
+ struct in6_addr a;
+ unsigned int i;
+ int bits;
+
+ a = r->min_addr.in6;
+ printf("%s", xtables_ip6addr_to_numeric(&a));
+ for (i = 0; i < 4; i++)
+ a.s6_addr32[i] = ~(r->min_addr.ip6[i] ^ r->max_addr.ip6[i]);
+ bits = ipv6_prefix_length(&a);
+ if (bits < 0)
+ printf("/%s", xtables_ip6addr_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_IPV6,
+ .size = XT_ALIGN(sizeof(struct nf_nat_range)),
+ .userspacesize = XT_ALIGN(sizeof(struct nf_nat_range)),
+ .help = NETMAP_help,
+ .x6_parse = NETMAP_parse,
+ .print = NETMAP_print,
+ .save = NETMAP_save,
+ .x6_options = NETMAP_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&netmap_tg_reg);
+}
--
1.7.1
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