Add translation for AH to nftables.
Examples:
$ sudo ip6tables-translate -A INPUT -m ah --ahspi 500 -j DROP
nft add rule ip6 filter INPUT ah spi 500 counter drop
$ sudo ip6tables-translate -A INPUT -m ah --ahspi 500:550 -j DROP
nft add rule ip6 filter INPUT ah spi 500-550 counter drop
$ sudo ip6tables-translate -A INPUT -m ah ! --ahlen 120
nft add rule ip6 filter INPUT ah hdrlength != 120 counter
$ sudo ip6tables-translate -A INPUT -m ah --ahres
nft add rule ip6 filter INPUT ah reserved 1 counter
Signed-off-by: Shivani Bhardwaj <shivanib134@xxxxxxxxx>
---
extensions/libip6t_ah.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/extensions/libip6t_ah.c b/extensions/libip6t_ah.c
index 174d6d1..f7c30f4 100644
--- a/extensions/libip6t_ah.c
+++ b/extensions/libip6t_ah.c
@@ -128,6 +128,32 @@ static void ah_save(const void *ip, const struct xt_entry_match *match)
printf(" --ahres");
}
+static int ah_xlate(const struct xt_entry_match *match,
+ struct xt_buf *buf, int numeric)
+{
+ const struct ip6t_ah *ahinfo = (struct ip6t_ah *)match->data;
+
+ if (!(ahinfo->spis[0] == 0 && ahinfo->spis[1] == 0xFFFFFFFF)) {
+ xt_buf_add(buf, "ah spi%s ",
+ (ahinfo->invflags & IP6T_AH_INV_SPI) ? " !=" : "");
+ if (ahinfo->spis[0] != ahinfo->spis[1])
+ xt_buf_add(buf, "%u-%u ", ahinfo->spis[0], ahinfo->spis[1]);
+ else
+ xt_buf_add(buf, "%u ", ahinfo->spis[0]);
+ }
+
+ if (ahinfo->hdrlen != 0 || (ahinfo->invflags & IP6T_AH_INV_LEN)) {
+ xt_buf_add(buf, "ah hdrlength%s %u ",
+ (ahinfo->invflags & IP6T_AH_INV_LEN) ? " !=" : "",
+ ahinfo->hdrlen);
+ }
+
+ if (ahinfo->hdrres != 0)
+ xt_buf_add(buf, "ah reserved %u ", ahinfo->hdrres);
+
+ return 1;
+}
+
static struct xtables_match ah_mt6_reg = {
.name = "ah",
.version = XTABLES_VERSION,
@@ -140,6 +166,7 @@ static struct xtables_match ah_mt6_reg = {
.save = ah_save,
.x6_parse = ah_parse,
.x6_options = ah_opts,
+ .xlate = ah_xlate,
};
void
--
1.9.1
--
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