Add translation for device group to nftables.
Examples:
$ sudo iptables-translate -A FORWARD -m devgroup --src-group 0x2 -j ACCEPT
nft add rule ip filter FORWARD iifgroup 0x2 counter accept
$ sudo iptables-translate -A FORWARD -m devgroup --dst-group 0xc/0xc -j ACCEPT
nft add rule ip filter FORWARD oifgroup and 0xc == 0xc counter accept
$ sudo iptables-translate -t mangle -A PREROUTING -p tcp --dport 46000 -m devgroup --src-group 23 -j ACCEPT
nft add rule ip mangle PREROUTING tcp dport 46000 iifgroup 0x17 counter accept
$ sudo iptables-translate -A FORWARD -m devgroup ! --dst-group 0xc/0xc -j ACCEPT
nft add rule ip filter FORWARD oifgroup and 0xc != 0xc counter accept
$ sudo iptables-translate -A FORWARD -m devgroup ! --src-group 0x2 -j ACCEPT
nft add rule ip filter FORWARD iifgroup != 0x2 counter accept
Signed-off-by : Shivani Bhardwaj <shivanib134@xxxxxxxxx>
---
Changes in v3:
Fix the code to provide fully functional inversions
extensions/libxt_devgroup.c | 57 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 55 insertions(+), 2 deletions(-)
diff --git a/extensions/libxt_devgroup.c b/extensions/libxt_devgroup.c
index 1a52627..3dec16a 100644
--- a/extensions/libxt_devgroup.c
+++ b/extensions/libxt_devgroup.c
@@ -37,6 +37,7 @@ static struct xtables_lmap *devgroups;
static void devgroup_init(struct xt_entry_match *match)
{
const char file[] = "/etc/iproute2/group";
+
devgroups = xtables_lmap_init(file);
if (devgroups == NULL && errno != ENOENT)
fprintf(stderr, "Warning: %s: %s\n", file, strerror(errno));
@@ -52,7 +53,7 @@ static void devgroup_parse_groupspec(const char *arg, unsigned int *group,
if (ok && (*end == '/' || *end == '\0')) {
if (*end == '/')
ok = xtables_strtoui(end + 1, NULL, mask,
- 0, UINT32_MAX);
+ 0, UINT32_MAX);
else
*mask = ~0U;
if (!ok)
@@ -129,7 +130,7 @@ static void devgroup_show(const char *pfx, const struct xt_devgroup_info *info,
}
static void devgroup_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
+ int numeric)
{
const struct xt_devgroup_info *info = (const void *)match->data;
@@ -151,6 +152,57 @@ static void devgroup_check(struct xt_fcheck_call *cb)
"'--src-group' or '--dst-group'");
}
+static void
+print_devgroup_xlate(unsigned int id, const char *str, unsigned int mask,
+ struct xt_buf *buf, int numeric)
+{
+ const char *name = NULL;
+
+ if (mask != 0xffffffff)
+ xt_buf_add(buf, "and 0x%x %s 0x%x ", id, str, mask);
+ else {
+ if (numeric == 0)
+ name = xtables_lmap_id2name(devgroups, id);
+ if (name)
+ xt_buf_add(buf, "%s ", name);
+ else
+ xt_buf_add(buf, "%s0x%x ",
+ !strcmp(str, "==") ? "" : "!= ", id);
+ }
+}
+
+static void devgroup_show_xlate(const struct xt_devgroup_info *info,
+ struct xt_buf *buf, int numeric)
+{
+ const char *str = "==";
+
+ if (info->flags & XT_DEVGROUP_MATCH_SRC) {
+ if (info->flags & XT_DEVGROUP_INVERT_SRC)
+ str = "!=";
+ xt_buf_add(buf, "iifgroup ");
+ print_devgroup_xlate(info->src_group, str,
+ info->src_mask, buf, numeric);
+ }
+
+ if (info->flags & XT_DEVGROUP_MATCH_DST) {
+ if (info->flags & XT_DEVGROUP_INVERT_DST)
+ str = "!=";
+ xt_buf_add(buf, "oifgroup ");
+ print_devgroup_xlate(info->dst_group, str,
+ info->dst_mask, buf, numeric);
+ }
+}
+
+static int devgroup_xlate(const struct xt_entry_match *match,
+ struct xt_buf *buf, int numeric)
+{
+ const struct xt_devgroup_info *info = (const void *)match->data;
+
+ devgroup_show_xlate(info, buf, 0);
+
+ return 1;
+}
+
static struct xtables_match devgroup_mt_reg = {
.name = "devgroup",
.version = XTABLES_VERSION,
@@ -164,6 +216,7 @@ static struct xtables_match devgroup_mt_reg = {
.x6_parse = devgroup_parse,
.x6_fcheck = devgroup_check,
.x6_options = devgroup_opts,
+ .xlate = devgroup_xlate,
};
void _init(void)
--
1.9.1
--
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