[PATCH 5/6] conntrack: use libmnl for ct entries deletion

[Mikhail Sennikovsky <mikhail.sennikovskii@xxxxxxxxx>]

Use libmnl and libnetfilter_conntrack mnl helpers to delete
the conntrack table entries.

Signed-off-by: Mikhail Sennikovsky <mikhail.sennikovskii@xxxxxxxxx>
---
 src/conntrack.c | 108 ++++++++++++++++++++++++++----------------------
 1 file changed, 59 insertions(+), 49 deletions(-)

diff --git a/src/conntrack.c b/src/conntrack.c
index 327ca55..de5c051 100644
--- a/src/conntrack.c
+++ b/src/conntrack.c
@@ -608,7 +608,7 @@ static const char usage_parameters[] =
 
 #define OPTION_OFFSET 256
 
-static struct nfct_handle *cth, *ith;
+static struct nfct_handle *cth;
 static struct option *opts = original_opts;
 static unsigned int global_option_offset = 0;
 
@@ -2036,46 +2036,6 @@ done:
 	return NFCT_CB_CONTINUE;
 }
 
-static int delete_cb(enum nf_conntrack_msg_type type,
-		     struct nf_conntrack *ct,
-		     void *data)
-{
-	unsigned int op_type = NFCT_O_DEFAULT;
-	unsigned int op_flags = 0;
-	struct ct_cmd *cmd = data;
-	char buf[1024];
-	int res;
-
-	if (nfct_filter(cmd, ct, cur_tmpl))
-		return NFCT_CB_CONTINUE;
-
-	res = nfct_query(ith, NFCT_Q_DESTROY, ct);
-	if (res < 0)
-		exit_error(OTHER_PROBLEM,
-			   "Operation failed: %s",
-			   err2str(errno, CT_DELETE));
-
-	if (output_mask & _O_SAVE) {
-		ct_save_snprintf(buf, sizeof(buf), ct, labelmap, NFCT_T_DESTROY);
-		goto done;
-	}
-
-	if (output_mask & _O_XML)
-		op_type = NFCT_O_XML;
-	if (output_mask & _O_EXT)
-		op_flags = NFCT_OF_SHOW_LAYER3;
-	if (output_mask & _O_ID)
-		op_flags |= NFCT_OF_ID;
-
-	nfct_snprintf(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, op_type, op_flags);
-done:
-	printf("%s\n", buf);
-
-	counter++;
-
-	return NFCT_CB_CONTINUE;
-}
-
 static void copy_mark(const struct ct_cmd *cmd, struct nf_conntrack *tmp,
 		      const struct nf_conntrack *ct,
 		      const struct u32_mask *m)
@@ -2746,6 +2706,56 @@ destroy_ok:
 	return MNL_CB_OK;
 }
 
+static int mnl_nfct_delete_cb(const struct nlmsghdr *nlh, void *data)
+{
+	unsigned int op_type = NFCT_O_DEFAULT;
+	unsigned int op_flags = 0;
+	struct ct_cmd *cmd = data;
+	char buf[1024];
+	int res;
+	struct nf_conntrack *ct;
+
+	ct = nfct_new();
+	if (ct == NULL)
+		return MNL_CB_OK;
+
+	nfct_nlmsg_parse(nlh, ct);
+
+	if (nfct_filter(cmd, ct, cur_tmpl))
+		goto destroy_ok;
+
+	res = nfct_mnl_update(&modifier_sock,
+						NFNL_SUBSYS_CTNETLINK,
+						IPCTNL_MSG_CT_DELETE,
+						ct);
+	if (res < 0)
+		exit_error(OTHER_PROBLEM,
+			   "Operation failed: %s",
+			   err2str(errno, CT_DELETE));
+
+	if (output_mask & _O_SAVE) {
+		ct_save_snprintf(buf, sizeof(buf), ct, labelmap, NFCT_T_DESTROY);
+		goto done;
+	}
+
+	if (output_mask & _O_XML)
+		op_type = NFCT_O_XML;
+	if (output_mask & _O_EXT)
+		op_flags = NFCT_OF_SHOW_LAYER3;
+	if (output_mask & _O_ID)
+		op_flags |= NFCT_OF_ID;
+
+	nfct_snprintf(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, op_type, op_flags);
+done:
+	printf("%s\n", buf);
+
+	counter++;
+
+destroy_ok:
+	nfct_destroy(ct);
+	return NFCT_CB_CONTINUE;
+}
+
 static struct ctproto_handler *h;
 
 static void labelmap_init(void)
@@ -3422,15 +3432,12 @@ static int do_command_ct(const char *progname, struct ct_cmd *cmd)
 		break;
 
 	case CT_DELETE:
-		cth = nfct_open(CONNTRACK, 0);
-		ith = nfct_open(CONNTRACK, 0);
-		if (!cth || !ith)
+		if (nfct_mnl_socket_open(&sock, 0) < 0
+				|| nfct_mnl_socket_open(&modifier_sock, 0) < 0)
 			exit_error(OTHER_PROBLEM, "Can't open handler");
 
 		nfct_filter_init(cmd);
 
-		nfct_callback_register(cth, NFCT_T_ALL, delete_cb, cmd);
-
 		filter_dump = nfct_filter_dump_create();
 		if (filter_dump == NULL)
 			exit_error(OTHER_PROBLEM, "OOM");
@@ -3444,12 +3451,15 @@ static int do_command_ct(const char *progname, struct ct_cmd *cmd)
 					     NFCT_FILTER_DUMP_L3NUM,
 					     cmd->family);
 
-		res = nfct_query(cth, NFCT_Q_DUMP_FILTER, filter_dump);
+		res = nfct_mnl_dump(&sock,
+				    NFNL_SUBSYS_CTNETLINK,
+				    IPCTNL_MSG_CT_GET,
+				    mnl_nfct_delete_cb, cmd, filter_dump);
 
 		nfct_filter_dump_destroy(filter_dump);
 
-		nfct_close(ith);
-		nfct_close(cth);
+		nfct_mnl_socket_close(&modifier_sock);
+		nfct_mnl_socket_close(&sock);
 		break;
 
 	case EXP_DELETE:
-- 
2.25.1