extensions: libip6t_mh: Add translation to nft

Add translation for mobility header to nftables.

Examples:

$ sudo ip6tables-translate -A INPUT -p mh --mh-type 1 -j ACCEPT
nft add rule ip6 filter INPUT meta l4proto mobility-header mh type 1 counter accept

$ sudo ip6tables-translate -A INPUT -p mh --mh-type 1:3 -j ACCEPT
nft add rule ip6 filter INPUT meta l4proto mobility-header mh type 1-3 counter accept

Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/extensions/libip6t_mh.c b/extensions/libip6t_mh.c
index 686a2932f3d59535a703397e4b2470db6227a334..c48582c8dcc5971bd6d1b34ba6e07d046cd0fd8b 100644 (file)
--- a/extensions/libip6t_mh.c
+++ b/extensions/libip6t_mh.c
@@ -202,6 +202,26 @@ static void mh_save(const void *ip, const struct xt_entry_match *match)
                printf(" --mh-type %u", mhinfo->types[0]);
 }
 
+static int mh_xlate(const struct xt_entry_match *match,
+                   struct xt_xlate *xl, int numeric)
+{
+       const struct ip6t_mh *mhinfo = (struct ip6t_mh *)match->data;
+
+       if (mhinfo->types[0] == 0 && mhinfo->types[1] == 0xff)
+               return 1;
+
+       if (mhinfo->types[0] != mhinfo->types[1])
+               xt_xlate_add(xl, "mh type %s%u-%u ",
+                            mhinfo->invflags & IP6T_MH_INV_TYPE ? "!= " : "",
+                            mhinfo->types[0], mhinfo->types[1]);
+       else
+               xt_xlate_add(xl, "mh type %s%u ",
+                            mhinfo->invflags & IP6T_MH_INV_TYPE ? "!= " : "",
+                            mhinfo->types[0]);
+
+       return 1;
+}
+
 static const struct xt_option_entry mh_opts[] = {
        {.name = "mh-type", .id = O_MH_TYPE, .type = XTTYPE_STRING,
         .flags = XTOPT_INVERT},
@@ -220,6 +240,7 @@ static struct xtables_match mh_mt6_reg = {
        .print          = mh_print,
        .save           = mh_save,
        .x6_options     = mh_opts,
+       .xlate          = mh_xlate,
 };
 
 void _init(void)