Add translation for frag to nftables. According to the --fraglen code:
case O_FRAGLEN:
/*
* As of Linux 3.0, the kernel does not check for
* fraglen at all.
*/
In addition, the kernel code doesn't show any reference to the flag
IP6T_FRAG_LEN, so this option is deprecated and won't be translated to
nft.
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
$ sudo iptables-translate -t filter -A INPUT -m frag --fragid 100:200
--fraglast -j ACCEPT
nft add rule ip6 filter INPUT frag id 100-200 frag more-fragments 1 counter
accept
$ sudo iptables-translate -t filter -A INPUT -m frag --fragid 100:200
--fragfirst -j ACCEPT
nft add rule ip6 filter INPUT frag id 100-200 frag frag-off 0 counter accept
$ sudo iptables-translate -t filter -A INPUT -m frag --fraglast -j ACCEPT
nft add rule ip6 filter INPUT frag more-fragments 0 counter accept
Signed-off-by: Laura Garcia Liebana <nev...@gmail.com>
---
Changes in v2:
- Include translation for fragfirst and fraglast.
- fraglen is marked as deprecated.
Changes in v3:
- Ignore completely IP6T_FRAG_LEN.
Changes in v4:
- Traduce fraglast as no more fragments.
extensions/libip6t_frag.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/extensions/libip6t_frag.c b/extensions/libip6t_frag.c
index 023df62..57487c4 100644
--- a/extensions/libip6t_frag.c
+++ b/extensions/libip6t_frag.c
@@ -173,6 +173,37 @@ 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->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_FST)
+ xt_xlate_add(xl, "frag frag-off 0 ");
+
+ if (fraginfo->flags & IP6T_FRAG_MF)
+ xt_xlate_add(xl, "frag more-fragments 1 ");
+
+ if (fraginfo->flags & IP6T_FRAG_NMF)
+ xt_xlate_add(xl, "frag more-fragments 0 ");
+
+ return 1;
+}
+
static struct xtables_match frag_mt6_reg = {
.name = "frag",
.version = XTABLES_VERSION,
@@ -185,6 +216,7 @@ 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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