This patch adds a new exetension to iptables to inner IPv6
packet 'inner6' match.
Signed-off-by: Ahmed Abdelsalam <amsalam20@xxxxxxxxx>
---
extensions/libip6t_inner6.c | 111 +++++++++++++++++++++++++++++
extensions/libip6t_inner6.t | 4 ++
include/linux/netfilter_ipv6/ip6t_inner6.h | 20 ++++++
3 files changed, 135 insertions(+)
create mode 100644 extensions/libip6t_inner6.c
create mode 100644 extensions/libip6t_inner6.t
create mode 100644 include/linux/netfilter_ipv6/ip6t_inner6.h
diff --git a/extensions/libip6t_inner6.c b/extensions/libip6t_inner6.c
new file mode 100644
index 0000000..096a913
--- /dev/null
+++ b/extensions/libip6t_inner6.c
@@ -0,0 +1,111 @@
+/* Shared library to add inner IPv6 packet matching support.
+ *
+ * Author:
+ * Ahmed Abdelsalam <amsalam20@xxxxxxxxx>
+ */
+
+#include <stdio.h>
+#include <xtables.h>
+#include <linux/netfilter_ipv6/ip6t_inner6.h>
+#include <string.h>
+
+/* inner6 command-line options */
+enum {
+ O_INNER6_SRC,
+ O_INNER6_DST,
+};
+
+static void inner6_help(void)
+{
+ printf(
+"srh match options:\n"
+"[!] --inner6-src ip6_addr[/mask] Source address of inner IPv6 packet\n"
+"[!] --inner6-dst ip6_addr[/mask] Destination address of inner IPv6 packet\n");
+}
+
+#define s struct ip6t_inner6
+static const struct xt_option_entry inner6_opts[] = {
+ { .name = "inner6-src", .id = O_INNER6_SRC, .type = XTTYPE_HOSTMASK,
+ .flags = XTOPT_INVERT},
+ { .name = "inner6-dst", .id = O_INNER6_DST, .type = XTTYPE_HOSTMASK,
+ .flags = XTOPT_INVERT},
+ { }
+};
+#undef s
+
+static void inner6_init(struct xt_entry_match *m)
+{
+ struct ip6t_inner6 *inner6info = (void *)m->data;
+
+ inner6info->invflags = 0;
+}
+
+static void inner6_parse(struct xt_option_call *cb)
+{
+ struct ip6t_inner6 *inner6info = cb->data;
+
+ xtables_option_parse(cb);
+ switch (cb->entry->id) {
+ case O_INNER6_SRC:
+ inner6info->inner_src = cb->val.haddr.in6;
+ inner6info->inner_smsk = cb->val.hmask.in6;
+ if (cb->invert)
+ inner6info->invflags |= IP6T_INNER6_INV_SRC;
+ break;
+ case O_INNER6_DST:
+ inner6info->inner_dst = cb->val.haddr.in6;
+ inner6info->inner_dmsk = cb->val.hmask.in6;
+ if (cb->invert)
+ inner6info->invflags |= IP6T_INNER6_INV_DST;
+ break;
+ }
+}
+
+static void inner6_print(const void *ip, const struct xt_entry_match *match,
+ int numeric)
+{
+ const struct ip6t_inner6 *inner6info = (struct ip6t_inner6 *)match->data;
+
+ printf(" inner6 inner6-src %s %s/%u",
+ inner6info->invflags & IP6T_INNER6_INV_SRC ? "!" : "",
+ xtables_ip6addr_to_numeric(&inner6info->inner_src),
+ xtables_ip6mask_to_cidr(&inner6info->inner_smsk));
+ printf(" inner6-dst %s %s/%u",
+ inner6info->invflags & IP6T_INNER6_INV_DST ? "!" : "",
+ xtables_ip6addr_to_numeric(&inner6info->inner_dst),
+ xtables_ip6mask_to_cidr(&inner6info->inner_dmsk));
+}
+
+static void inner6_save(const void *ip, const struct xt_entry_match *match)
+{
+ const struct ip6t_inner6 *inner6info = (struct ip6t_inner6 *)match->data;
+
+ printf("%s --inner6-src %s/%u",
+ inner6info->invflags & IP6T_INNER6_INV_SRC ? " !" : "",
+ xtables_ip6addr_to_numeric(&inner6info->inner_src),
+ xtables_ip6mask_to_cidr(&inner6info->inner_smsk));
+ printf("%s --inner6-dst %s/%u",
+ inner6info->invflags & IP6T_INNER6_INV_DST ? " !" : "",
+ xtables_ip6addr_to_numeric(&inner6info->inner_dst),
+ xtables_ip6mask_to_cidr(&inner6info->inner_dmsk));
+}
+
+static struct xtables_match inner6_mt6_reg = {
+ .name = "inner6",
+ .version = XTABLES_VERSION,
+ .family = NFPROTO_IPV6,
+ .size = XT_ALIGN(sizeof(struct ip6t_inner6)),
+ .userspacesize = XT_ALIGN(sizeof(struct ip6t_inner6)),
+ .help = inner6_help,
+ .init = inner6_init,
+ .print = inner6_print,
+ .save = inner6_save,
+ .x6_parse = inner6_parse,
+ .x6_options = inner6_opts,
+};
+
+void
+_init(void)
+{
+ xtables_register_match(&inner6_mt6_reg);
+}
diff --git a/extensions/libip6t_inner6.t b/extensions/libip6t_inner6.t
new file mode 100644
index 0000000..d3d33a5
--- /dev/null
+++ b/extensions/libip6t_inner6.t
@@ -0,0 +1,4 @@
+:INPUT,FORWARD,OUTPUT
+-m inner6 --inner6-src a::2/64 --inner6-dst b::2/64;=;OK
+-m inner6 ! --inner6-src fc00:1::/64 ! --inner6-dst fc00:2::/64;=;OK
+-m inner6;=;OK
diff --git a/include/linux/netfilter_ipv6/ip6t_inner6.h b/include/linux/netfilter_ipv6/ip6t_inner6.h
new file mode 100644
index 0000000..f55b9f5
--- /dev/null
+++ b/include/linux/netfilter_ipv6/ip6t_inner6.h
@@ -0,0 +1,20 @@
+#ifndef _IP6T_INNER6_H
+#define _IP6T_INNER6_H
+
+#include <linux/types.h>
+#include <linux/netfilter.h>
+
+/* Values for "invflags" field in struct ip6t_inner6 */
+#define IP6T_INNER6_INV_SRC 0x01
+#define IP6T_INNER6_INV_DST 0x02
+#define IP6T_INNER6_INV_MASK 0x03
+
+struct ip6t_inner6 {
+ /* Source and destination addr of inner IPv6 packet */
+ struct in6_addr inner_src, inner_dst;
+ /* Mask for src and dest addr of inner IPv6 packet */
+ struct in6_addr inner_smsk, inner_dmsk;
+ __u8 invflags;
+};
+
+#endif /*_IP6T_INNER6_H*/
--
2.1.4
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