Add translation for match comment to nftables.
This patch also adds the relevant infrastructure for carrying out
the translation.
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 <shivanib...@gmail.com>
---
extensions/libxt_comment.c | 13 +++++++++++++
include/xtables.h | 1 +
iptables/nft-ipv4.c | 6 ++++++
iptables/nft-ipv6.c | 6 ++++++
libxtables/xtables.c | 5 +++++
5 files changed, 31 insertions(+)
diff --git a/extensions/libxt_comment.c b/extensions/libxt_comment.c
index 6ed2ff9..464ca09 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_xlate *xl, int numeric)
+{
+ struct xt_comment_info *commentinfo = (void *)match->data;
+
+ commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';
+ xt_xlate_add_comment(xl, 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/include/xtables.h b/include/xtables.h
index 6fd3bdf..e219c9f 100644
--- a/include/xtables.h
+++ b/include/xtables.h
@@ -574,6 +574,7 @@ struct xt_xlate *xt_xlate_alloc(int size);
void xt_xlate_free(struct xt_xlate *xl);
void xt_xlate_add(struct xt_xlate *xl, const char *fmt, ...);
void xt_xlate_add_comment(struct xt_xlate *xl, const char *comment);
+const char *xt_xlate_get_comment(struct xt_xlate *xl);
const char *xt_xlate_get(struct xt_xlate *xl);
#ifdef XTABLES_INTERNAL
diff --git a/iptables/nft-ipv4.c b/iptables/nft-ipv4.c
index 5e2857d..3c41755 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_xlate
*xl)
{
const struct iptables_command_state *cs = data;
int ret;
+ const char *comment;
if (cs->fw.ip.iniface[0] != '\0') {
xt_xlate_add(xl, "iifname %s%s ",
@@ -484,6 +485,11 @@ static int nft_ipv4_xlate(const void *data, struct
xt_xlate *xl)
/* Always add counters per rule, as in iptables */
xt_xlate_add(xl, "counter ");
+ comment = xt_xlate_get_comment(xl);
+
+ if (strcmp(comment, ""))
+ xt_xlate_add(xl, "comment \\\"%s\\\" ", comment);
+
ret = xlate_action(cs, !!(cs->fw.ip.flags & IPT_F_GOTO), xl);
return ret;
diff --git a/iptables/nft-ipv6.c b/iptables/nft-ipv6.c
index bbf289b..8912f1d 100644
--- a/iptables/nft-ipv6.c
+++ b/iptables/nft-ipv6.c
@@ -393,6 +393,7 @@ static int nft_ipv6_xlate(const void *data, struct xt_xlate
*xl)
{
const struct iptables_command_state *cs = data;
int ret;
+ const char *comment;
if (cs->fw6.ipv6.iniface[0] != '\0') {
xt_xlate_add(xl, "iifname %s%s ",
@@ -435,6 +436,11 @@ static int nft_ipv6_xlate(const void *data, struct
xt_xlate *xl)
/* Always add counters per rule, as in iptables */
xt_xlate_add(xl, "counter ");
+ comment = xt_xlate_get_comment(xl);
+
+ if (strcmp(comment, ""))
+ xt_xlate_add(xl, "comment \\\"%s\\\" ", comment);
+
ret = xlate_action(cs, !!(cs->fw6.ipv6.flags & IP6T_F_GOTO), xl);
return ret;
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index c4b86f5..decd7be 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -2045,6 +2045,11 @@ void xt_xlate_add_comment(struct xt_xlate *xl, const
char *comment)
xl->comment[NFT_USERDATA_MAXLEN - 1] = '\0';
}
+const char *xt_xlate_get_comment(struct xt_xlate *xl)
+{
+ return xl->comment;
+}
+
const char *xt_xlate_get(struct xt_xlate *xl)
{
return xl->buf.data;
--
1.9.1
--
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