Add translation for ESP Protocol to nftables.
Examples:
$ sudo iptables-translate -A FORWARD -p esp -j ACCEPT
nft add rule ip filter FORWARD ip protocol esp counter accept
$ sudo iptables-translate -A INPUT --in-interface wan --protocol esp -j ACCEPT
nft add rule ip filter INPUT iifname wan ip protocol esp counter accept
$ sudo iptables-translate -A INPUT -p 50 -m esp --espspi 500 -j DROP
nft add rule ip filter INPUT esp spi 500 counter drop
Signed-off-by: Shivani Bhardwaj <shivanib134@xxxxxxxxx>
---
extensions/libxt_esp.c | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/extensions/libxt_esp.c b/extensions/libxt_esp.c
index 294338b..1c198c6 100644
--- a/extensions/libxt_esp.c
+++ b/extensions/libxt_esp.c
@@ -79,10 +79,28 @@ static void esp_save(const void *ip, const struct xt_entry_match *match)
}
+static int esp_xlate(const struct xt_entry_match *match,
+ struct xt_buf *buf, int numeric)
+{
+ const struct xt_esp *espinfo = (struct xt_esp *)match->data;
+
+ if (!(espinfo->spis[0] == 0 && espinfo->spis[1] == 0xFFFFFFFF)) {
+ xt_buf_add(buf, "%s esp spi ",
+ (espinfo->invflags & XT_ESP_INV_SPI) ? " !=" : "");
+ if (espinfo->spis[0] != espinfo->spis[1])
+ xt_buf_add(buf, "%u:%u ", espinfo->spis[0],
+ espinfo->spis[1]);
+ else
+ xt_buf_add(buf, "%u ", espinfo->spis[0]);
+ }
+
+ return 1;
+}
+
static struct xtables_match esp_match = {
.family = NFPROTO_UNSPEC,
- .name = "esp",
- .version = XTABLES_VERSION,
+ .name = "esp",
+ .version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_esp)),
.userspacesize = XT_ALIGN(sizeof(struct xt_esp)),
.help = esp_help,
@@ -90,6 +108,7 @@ static struct xtables_match esp_match = {
.save = esp_save,
.x6_parse = esp_parse,
.x6_options = esp_opts,
+ .xlate = esp_xlate,
};
void
--
1.9.1
--
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