[PATCH iproute2-next] tc: pedit: Support JSON dumping

* [PATCH iproute2-next] tc: pedit: Support JSON dumping
@ 2020-04-22 17:06 Petr Machata
  2020-04-22 20:02 ` Stephen Hemminger
  0 siblings, 1 reply; 7+ messages in thread
From: Petr Machata @ 2020-04-22 17:06 UTC (permalink / raw)
  To: netdev; +Cc: Petr Machata, dsahern, stephen

The action pedit does not currently support dumping to JSON. Convert
print_pedit() to the print_* family of functions so that dumping is correct
both in plain and JSON mode. In plain mode, the output is character for
character the same as it was before. In JSON mode, this is an example dump:

$ tc filter add dev dummy0 ingress prio 125 flower \
         action pedit ex munge udp dport set 12345 \
	                 munge ip ttl add 1        \
			 munge offset 10 u8 clear
$ tc -j filter show dev dummy0 ingress | jq
[
  {
    "protocol": "all",
    "pref": 125,
    "kind": "flower",
    "chain": 0
  },
  {
    "protocol": "all",
    "pref": 125,
    "kind": "flower",
    "chain": 0,
    "options": {
      "handle": 1,
      "keys": {},
      "not_in_hw": true,
      "actions": [
        {
          "order": 1,
          "kind": "pedit",
          "control_action": {
            "type": "pass"
          },
          "nkeys": 3,
          "index": 1,
          "ref": 1,
          "bind": 1,
          "keys": [
            {
              "htype": "udp",
              "offset": 0,
              "cmd": "set",
              "val": "3039",
              "mask": "ffff0000"
            },
            {
              "htype": "ipv4",
              "offset": 8,
              "cmd": "add",
              "val": "1000000",
              "mask": "ffffff"
            },
            {
              "htype": "network",
              "offset": 8,
              "cmd": "set",
              "val": "0",
              "mask": "ffff00ff"
            }
          ]
        }
      ]
    }
  }
]

Signed-off-by: Petr Machata <petrm@mellanox.com>
---
 tc/m_pedit.c | 64 +++++++++++++++++++++++++++++++++-------------------
 1 file changed, 41 insertions(+), 23 deletions(-)

diff --git a/tc/m_pedit.c b/tc/m_pedit.c
index fccfd17c..d3aa08de 100644
--- a/tc/m_pedit.c
+++ b/tc/m_pedit.c
@@ -714,20 +714,28 @@ static const char * const pedit_htype_str[] = {
 	[TCA_PEDIT_KEY_EX_HDR_TYPE_UDP] = "udp",
 };
 
-static void print_pedit_location(FILE *f,
-				 enum pedit_header_type htype, __u32 off)
+static int print_pedit_location(FILE *f,
+				enum pedit_header_type htype, __u32 off)
 {
-	if (htype == TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK) {
-		fprintf(f, "%d", (unsigned int)off);
-		return;
+	char *buf = NULL;
+	int rc;
+
+	if (htype != TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK) {
+		if (htype < ARRAY_SIZE(pedit_htype_str))
+			rc = asprintf(&buf, "%s", pedit_htype_str[htype]);
+		else
+			rc = asprintf(&buf, "unknown(%d)", htype);
+		if (rc < 0)
+			return rc;
+		print_string(PRINT_ANY, "htype", "%s", buf);
+		print_int(PRINT_ANY, "offset", "%+d", off);
+	} else {
+		print_string(PRINT_JSON, "htype", NULL, "network");
+		print_int(PRINT_ANY, "offset", "%d", off);
 	}
 
-	if (htype < ARRAY_SIZE(pedit_htype_str))
-		fprintf(f, "%s", pedit_htype_str[htype]);
-	else
-		fprintf(f, "unknown(%d)", htype);
-
-	fprintf(f, "%c%d", (int)off  >= 0 ? '+' : '-', abs((int)off));
+	free(buf);
+	return 0;
 }
 
 static int print_pedit(struct action_util *au, FILE *f, struct rtattr *arg)
@@ -735,6 +743,7 @@ static int print_pedit(struct action_util *au, FILE *f, struct rtattr *arg)
 	struct tc_pedit_sel *sel;
 	struct rtattr *tb[TCA_PEDIT_MAX + 1];
 	struct m_pedit_key_ex *keys_ex = NULL;
+	int err;
 
 	if (arg == NULL)
 		return -1;
@@ -774,11 +783,12 @@ static int print_pedit(struct action_util *au, FILE *f, struct rtattr *arg)
 		}
 	}
 
-	fprintf(f, " pedit ");
+	print_string(PRINT_ANY, "kind", " %s ", "pedit");
 	print_action_control(f, "action ", sel->action, " ");
-	fprintf(f,"keys %d\n ", sel->nkeys);
-	fprintf(f, "\t index %u ref %d bind %d", sel->index, sel->refcnt,
-		sel->bindcnt);
+	print_uint(PRINT_ANY, "nkeys", "keys %d\n", sel->nkeys);
+	print_uint(PRINT_ANY, "index", " \t index %u", sel->index);
+	print_int(PRINT_ANY, "ref", " ref %d", sel->refcnt);
+	print_int(PRINT_ANY, "bind", " bind %d", sel->bindcnt);
 
 	if (show_stats) {
 		if (tb[TCA_PEDIT_TM]) {
@@ -787,6 +797,7 @@ static int print_pedit(struct action_util *au, FILE *f, struct rtattr *arg)
 			print_tm(f, tm);
 		}
 	}
+	open_json_array(PRINT_JSON, "keys");
 	if (sel->nkeys) {
 		int i;
 		struct tc_pedit_key *key = sel->keys;
@@ -804,21 +815,28 @@ static int print_pedit(struct action_util *au, FILE *f, struct rtattr *arg)
 				key_ex++;
 			}
 
-			fprintf(f, "\n\t key #%d", i);
+			open_json_object(NULL);
+			print_uint(PRINT_FP, NULL, "\n\t key #%d  at ", i);
 
-			fprintf(f, "  at ");
+			err = print_pedit_location(f, htype, key->off);
+			if (err)
+				return err;
 
-			print_pedit_location(f, htype, key->off);
-
-			fprintf(f, ": %s %08x mask %08x",
-				cmd ? "add" : "val",
-				(unsigned int)ntohl(key->val),
-				(unsigned int)ntohl(key->mask));
+			print_string(PRINT_FP, NULL, ": %s",
+				     cmd ? "add" : "val");
+			print_string(PRINT_JSON, "cmd", NULL,
+				     cmd ? "add" : "set");
+			print_hex(PRINT_ANY, "val", " %08x",
+				  (unsigned int)ntohl(key->val));
+			print_hex(PRINT_ANY, "mask", " mask %08x",
+				  (unsigned int)ntohl(key->mask));
+			close_json_object();
 		}
 	} else {
 		fprintf(f, "\npedit %x keys %d is not LEGIT", sel->index,
 			sel->nkeys);
 	}
+	close_json_array(PRINT_JSON, " ");
 
 	print_nl();
 
-- 
2.20.1


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