tc_filter: resolve device name before parsing filter

Move resolving device name into an ifindex before calling filter
specific callbacks.  This way if filters need the ifindex, they
can read it from the request.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 24 insertions, 26 deletions

diff --git a/tc/tc_filter.c b/tc/tc_filter.c
index 276a66cb..73f17816 100644
--- a/tc/tc_filter.c
+++ b/tc/tc_filter.c
@@ -160,6 +160,16 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
 	if (k[0])
 		addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 
+	if (d[0])  {
+		ll_init_map(&rth);
+
+		req.t.tcm_ifindex = ll_name_to_index(d);
+		if (req.t.tcm_ifindex == 0) {
+			fprintf(stderr, "Cannot find device \"%s\"\n", d);
+			return 1;
+		}
+	}
+
 	if (q) {
 		if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
 			return 1;
@@ -182,17 +192,6 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
 	if (est.ewma_log)
 		addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 
-
-	if (d[0])  {
-		ll_init_map(&rth);
-
-		req.t.tcm_ifindex = ll_name_to_index(d);
-		if (req.t.tcm_ifindex == 0) {
-			fprintf(stderr, "Cannot find device \"%s\"\n", d);
-			return 1;
-		}
-	}
-
 	if (rtnl_talk(&rth, &req.n, NULL) < 0) {
 		fprintf(stderr, "We have an error talking to the kernel\n");
 		return 2;
@@ -452,10 +451,23 @@ static int tc_filter_get(int cmd, unsigned int flags, int argc, char **argv)
 		return -1;
 	}
 
+	if (d[0])  {
+		ll_init_map(&rth);
+
+		req.t.tcm_ifindex = ll_name_to_index(d);
+		if (req.t.tcm_ifindex  == 0) {
+			fprintf(stderr, "Cannot find device \"%s\"\n", d);
+			return 1;
+		}
+		filter_ifindex = req.t.tcm_ifindex;
+	} else {
+		fprintf(stderr, "Must specify netdevice \"dev\"\n");
+		return -1;
+	}
+
 	if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
 		return 1;
 
-
 	if (!fhandle) {
 		fprintf(stderr, "Must specify filter \"handle\"\n");
 		return -1;
@@ -470,20 +482,6 @@ static int tc_filter_get(int cmd, unsigned int flags, int argc, char **argv)
 		return -1;
 	}
 
-	if (d[0])  {
-		ll_init_map(&rth);
-
-		req.t.tcm_ifindex = ll_name_to_index(d);
-		if (req.t.tcm_ifindex  == 0) {
-			fprintf(stderr, "Cannot find device \"%s\"\n", d);
-			return 1;
-		}
-		filter_ifindex = req.t.tcm_ifindex;
-	} else {
-		fprintf(stderr, "Must specify netdevice \"dev\"\n");
-		return -1;
-	}
-
 	if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 		fprintf(stderr, "We have an error talking to the kernel\n");
 		return 2;