Add translation for Authentication Header to nftables.
Examples:
$ sudo iptables-translate -A INPUT -p 51 -m ah --ahspi 500 -j DROP
nft add rule ip filter INPUT ah spi 500 counter drop
$ sudo iptables-translate -A INPUT -p 51 -m ah --ahspi 500:600 -j DROP
nft add rule ip filter INPUT ah spi 500-600 counter drop
$ sudo iptables-translate -A INPUT -p 51 -m ah ! --ahspi 50 -j DROP
nft add rule ip filter INPUT ah spi != 50 counter drop
Signed-off-by: Shivani Bhardwaj <shivanib134@xxxxxxxxx>
---
extensions/libipt_ah.c | 37 ++++++++++++++++++++++++++++---------
1 file changed, 28 insertions(+), 9 deletions(-)
diff --git a/extensions/libipt_ah.c b/extensions/libipt_ah.c
index a490729..b55079e 100644
--- a/extensions/libipt_ah.c
+++ b/extensions/libipt_ah.c
@@ -52,15 +52,15 @@ print_spis(const char *name, uint32_t min, uint32_t max,
printf("%u", min);
} else {
printf("s:%s", inv);
- printf("%u",min);
+ printf("%u", min);
printf(":");
- printf("%u",max);
+ printf("%u", max);
}
}
}
static void ah_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
+ int numeric)
{
const struct ipt_ah *ah = (struct ipt_ah *)match->data;
@@ -92,18 +92,37 @@ static void ah_save(const void *ip, const struct xt_entry_match *match)
}
+static int ah_xlate(const struct xt_entry_match *match,
+ struct xt_buf *buf, int numeric)
+{
+ const struct ipt_ah *ahinfo = (struct ipt_ah *)match->data;
+
+ if (!(ahinfo->spis[0] == 0 && ahinfo->spis[1] == 0xFFFFFFFF)) {
+ xt_buf_add(buf, "ah spi%s ",
+ (ahinfo->invflags & IPT_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]);
+ }
+
+ return 1;
+}
+
static struct xtables_match ah_mt_reg = {
- .name = "ah",
- .version = XTABLES_VERSION,
+ .name = "ah",
+ .version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct ipt_ah)),
- .userspacesize = XT_ALIGN(sizeof(struct ipt_ah)),
- .help = ah_help,
+ .userspacesize = XT_ALIGN(sizeof(struct ipt_ah)),
+ .help = ah_help,
.init = ah_init,
- .print = ah_print,
- .save = ah_save,
+ .print = ah_print,
+ .save = ah_save,
.x6_parse = ah_parse,
.x6_options = ah_opts,
+ .xlate = ah_xlate,
};
void
--
1.9.1
--
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