netdev - [PATCH iproute2] tc: flower: fix json output with mpls lse

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Date:   Fri, 18 Dec 2020 23:25:28 +0100
From:   Guillaume Nault <gnault@...hat.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: [PATCH iproute2] tc: flower: fix json output with mpls lse

The json output of the TCA_FLOWER_KEY_MPLS_OPTS attribute was invalid.

Example:

  $ tc filter add dev eth0 ingress protocol mpls_uc flower mpls \
      lse depth 1 label 100                                     \
      lse depth 2 label 200

  $ tc -json filter show dev eth0 ingress
    ...{"eth_type":"8847",
        "  mpls":["    lse":["depth":1,"label":100],
                  "    lse":["depth":2,"label":200]]}...

This is invalid as the arrays, introduced by "[", can't contain raw
string:value pairs. Those must be enclosed into "{}" to form valid json
ojects. Also, there are spurious whitespaces before the mpls and lse
strings because of the indentation used for normal output.

Fix this by putting all LSE parameters (depth, label, tc, bos and ttl)
into the same json object. The "mpls" key now directly contains a list
of such objects.

Also, handle strings differently for normal and json output, so that
json strings don't get spurious indentation whitespaces.

Normal output isn't modified.
The json output now looks like:

  $ tc -json filter show dev eth0 ingress
    ...{"eth_type":"8847",
        "mpls":[{"depth":1,"label":100},
                {"depth":2,"label":200}]}...

Fixes: eb09a15c12fb ("tc: flower: support multiple MPLS LSE match")
Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 tc/f_flower.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/tc/f_flower.c b/tc/f_flower.c
index 00c919fd..27731078 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -2476,7 +2476,7 @@ static void flower_print_u32(const char *name, struct rtattr *attr)
 	print_uint(PRINT_ANY, name, namefrm, rta_getattr_u32(attr));
 }
 
-static void flower_print_mpls_opt_lse(const char *name, struct rtattr *lse)
+static void flower_print_mpls_opt_lse(struct rtattr *lse)
 {
 	struct rtattr *tb[TCA_FLOWER_KEY_MPLS_OPT_LSE_MAX + 1];
 	struct rtattr *attr;
@@ -2493,7 +2493,8 @@ static void flower_print_mpls_opt_lse(const char *name, struct rtattr *lse)
 		     RTA_PAYLOAD(lse));
 
 	print_nl();
-	open_json_array(PRINT_ANY, name);
+	print_string(PRINT_FP, NULL, "    lse", NULL);
+	open_json_object(NULL);
 	attr = tb[TCA_FLOWER_KEY_MPLS_OPT_LSE_DEPTH];
 	if (attr)
 		print_hhu(PRINT_ANY, "depth", " depth %u",
@@ -2511,10 +2512,10 @@ static void flower_print_mpls_opt_lse(const char *name, struct rtattr *lse)
 	attr = tb[TCA_FLOWER_KEY_MPLS_OPT_LSE_TTL];
 	if (attr)
 		print_hhu(PRINT_ANY, "ttl", " ttl %u", rta_getattr_u8(attr));
-	close_json_array(PRINT_JSON, NULL);
+	close_json_object();
 }
 
-static void flower_print_mpls_opts(const char *name, struct rtattr *attr)
+static void flower_print_mpls_opts(struct rtattr *attr)
 {
 	struct rtattr *lse;
 	int rem;
@@ -2523,11 +2524,12 @@ static void flower_print_mpls_opts(const char *name, struct rtattr *attr)
 		return;
 
 	print_nl();
-	open_json_array(PRINT_ANY, name);
+	print_string(PRINT_FP, NULL, "  mpls", NULL);
+	open_json_array(PRINT_JSON, "mpls");
 	rem = RTA_PAYLOAD(attr);
 	lse = RTA_DATA(attr);
 	while (RTA_OK(lse, rem)) {
-		flower_print_mpls_opt_lse("    lse", lse);
+		flower_print_mpls_opt_lse(lse);
 		lse = RTA_NEXT(lse, rem);
 	};
 	if (rem)
@@ -2650,7 +2652,7 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
 	flower_print_ip_attr("ip_ttl", tb[TCA_FLOWER_KEY_IP_TTL],
 			    tb[TCA_FLOWER_KEY_IP_TTL_MASK]);
 
-	flower_print_mpls_opts("  mpls", tb[TCA_FLOWER_KEY_MPLS_OPTS]);
+	flower_print_mpls_opts(tb[TCA_FLOWER_KEY_MPLS_OPTS]);
 	flower_print_u32("mpls_label", tb[TCA_FLOWER_KEY_MPLS_LABEL]);
 	flower_print_u8("mpls_tc", tb[TCA_FLOWER_KEY_MPLS_TC]);
 	flower_print_u8("mpls_bos", tb[TCA_FLOWER_KEY_MPLS_BOS]);
-- 
2.21.3