netdev - [PATCH iproute2] tc/basic: fix json output filter

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Date:   Thu,  1 Dec 2022 07:34:50 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Christian Pössinger <christian@...ssinger.com>
Cc:     netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: [PATCH iproute2] tc/basic: fix json output filter

The flowid and handle in basic were not using JSON routines to print.
 To reproduce the issue:

 $ tc qdisc add dev eth1 handle ffff: ingress
 $ tc filter add dev eth1 parent ffff: prio 20 protocol all u32 match ip dport 22 \
     0xffff action police conform-exceed drop/ok rate 100000 burst 15k flowid ffff:1

 $ tc filter add dev eth1 parent ffff: prio 255 protocol all basic action police \
     conform-exceed drop/ok rate 100000 burst 15k flowid ffff:3

Reported-by: Christian Pössinger <christian@...ssinger.com>
Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
---
 tc/f_basic.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/tc/f_basic.c b/tc/f_basic.c
index 9a60758e803e..9055370e90b9 100644
--- a/tc/f_basic.c
+++ b/tc/f_basic.c
@@ -119,19 +119,22 @@ static int basic_print_opt(struct filter_util *qu, FILE *f,
 	parse_rtattr_nested(tb, TCA_BASIC_MAX, opt);
 
 	if (handle)
-		fprintf(f, "handle 0x%x ", handle);
+		print_hex(PRINT_ANY, "handle",
+			  "handle 0x%x ", handle);
 
 	if (tb[TCA_BASIC_CLASSID]) {
+		uint32_t classid = rta_getattr_u32(tb[TCA_BASIC_CLASSID]);
 		SPRINT_BUF(b1);
-		fprintf(f, "flowid %s ",
-			sprint_tc_classid(rta_getattr_u32(tb[TCA_BASIC_CLASSID]), b1));
+
+		print_string(PRINT_ANY, "flowid", "flowid %s ",
+			     sprint_tc_classid(classid, b1));
 	}
 
 	if (tb[TCA_BASIC_EMATCHES])
 		print_ematch(f, tb[TCA_BASIC_EMATCHES]);
 
 	if (tb[TCA_BASIC_POLICE]) {
-		fprintf(f, "\n");
+		print_nl();
 		tc_print_police(f, tb[TCA_BASIC_POLICE]);
 	}
 
-- 
2.35.1