Add translation for frag to nftables. Not supported yet in nft: fraglen,
fragfirst and fraglast.
Examples:
$ sudo iptables-translate -t filter -A INPUT -m frag --fragid 100:200 -j ACCEPT
nft add rule ip6 filter INPUT frag id 100-200 counter accept
$ sudo iptables-translate -t filter -A INPUT -m frag --fragid 100 --fragres --fragmore -j ACCEPT
nft add rule ip6 filter INPUT frag id 100 frag reserved 1 frag
more-fragments 1 counter accept
$ sudo iptables-translate -t filter -A INPUT -m frag ! --fragid 100:200 -j ACCEPT
nft add rule ip6 filter INPUT frag id != 100-200 counter accept
Signed-off-by: Laura Garcia Liebana <nevola@xxxxxxxxx>
---
extensions/libip6t_frag.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/extensions/libip6t_frag.c b/extensions/libip6t_frag.c
index 023df62..00ba00f 100644
--- a/extensions/libip6t_frag.c
+++ b/extensions/libip6t_frag.c
@@ -173,6 +173,36 @@ static void frag_save(const void *ip, const struct xt_entry_match *match)
printf(" --fraglast");
}
+static int frag_xlate(const void *ip, const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ const struct ip6t_frag *fraginfo = (struct ip6t_frag *)match->data;
+
+ if ((fraginfo->flags & IP6T_FRAG_LEN) ||
+ (fraginfo->flags & IP6T_FRAG_FST) ||
+ (fraginfo->flags & IP6T_FRAG_NMF)) {
+ return 0;
+ }
+
+ if (!(fraginfo->ids[0] == 0 && fraginfo->ids[1] == 0xFFFFFFFF)) {
+ xt_xlate_add(xl, "frag id %s",
+ (fraginfo->invflags & IP6T_FRAG_INV_IDS) ? "!= " : "");
+ if (fraginfo->ids[0] != fraginfo->ids[1])
+ xt_xlate_add(xl, "%u-%u ", fraginfo->ids[0],
+ fraginfo->ids[1]);
+ else
+ xt_xlate_add(xl, "%u ", fraginfo->ids[0]);
+ }
+
+ if (fraginfo->flags & IP6T_FRAG_RES)
+ xt_xlate_add(xl, "frag reserved 1 ");
+
+ if (fraginfo->flags & IP6T_FRAG_MF)
+ xt_xlate_add(xl, "frag more-fragments 1 ");
+
+ return 1;
+}
+
static struct xtables_match frag_mt6_reg = {
.name = "frag",
.version = XTABLES_VERSION,
@@ -185,6 +215,7 @@ static struct xtables_match frag_mt6_reg = {
.save = frag_save,
.x6_parse = frag_parse,
.x6_options = frag_opts,
+ .xlate = frag_xlate,
};
void
--
2.7.0
--
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