Add translation for match comment to nftables.
Example:
$ sudo iptables-translate -A INPUT -s 192.168.0.0 -m comment --comment "A privatized IP block"
nft add rule ip filter INPUT ip saddr 192.168.0.0 counter comment \"A privatized IP block\"
Signed-off-by: Shivani Bhardwaj <shivanib134@xxxxxxxxx>
---
extensions/libxt_comment.c | 13 +++++++++++++
iptables/nft-ipv4.c | 17 +++++++++++++++--
2 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/extensions/libxt_comment.c b/extensions/libxt_comment.c
index 6ed2ff9..e80336c 100644
--- a/extensions/libxt_comment.c
+++ b/extensions/libxt_comment.c
@@ -48,6 +48,18 @@ comment_save(const void *ip, const struct xt_entry_match *match)
xtables_save_string(commentinfo->comment);
}
+static int
+comment_xlate(const struct xt_entry_match *match,
+ struct xt_buf *buf, int numeric)
+{
+ struct xt_comment_info *commentinfo = (void *)match->data;
+
+ commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';
+ xt_buf_add(buf, "comment \\\"%s\\\" ", commentinfo->comment);
+
+ return 1;
+}
+
static struct xtables_match comment_match = {
.family = NFPROTO_UNSPEC,
.name = "comment",
@@ -59,6 +71,7 @@ static struct xtables_match comment_match = {
.save = comment_save,
.x6_parse = xtables_option_parse,
.x6_options = comment_opts,
+ .xlate = comment_xlate,
};
void _init(void)
diff --git a/iptables/nft-ipv4.c b/iptables/nft-ipv4.c
index ede8f17..612b4f6 100644
--- a/iptables/nft-ipv4.c
+++ b/iptables/nft-ipv4.c
@@ -433,6 +433,7 @@ static int nft_ipv4_xlate(const void *data, struct xt_buf *buf)
{
const struct iptables_command_state *cs = data;
int ret;
+ bool comm = false;
if (cs->fw.ip.iniface[0] != '\0') {
xt_buf_add(buf, "iifname %s%s ",
@@ -477,12 +478,24 @@ static int nft_ipv4_xlate(const void *data, struct xt_buf *buf)
inet_ntoa(cs->fw.ip.dst));
}
+ /*
+ * Add counter for match comment as prefix
+ */
+ if (strcmp(cs->matches->match->name, "comment") == 0) {
+ comm = true;
+ xt_buf_add(buf, "counter ");
+ }
+
ret = xlate_matches(cs, buf);
if (!ret)
return ret;
- /* Always add counters per rule, as in iptables */
- xt_buf_add(buf, "counter ");
+ /*
+ * Always add counters per rule, as in iptables
+ * except for the match comment
+ */
+ if (!comm)
+ xt_buf_add(buf, "counter ");
ret = xlate_action(cs, !!(cs->fw.ip.flags & IPT_F_GOTO), buf);
--
1.9.1
--
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