tipc: JSON support for tipc link printouts

Add json output support for tipc link command

Example output:
$tipc -j -p link list

[ {
        "broadcast-link": "up",
        "1.1.1:bridge-1.1.104:eth0": "up",
        "1.1.1:bridge-1.1.105:eth0": "up",
        "1.1.1:bridge-1.1.106:eth0": "up"
    } ]

--------------------
$tipc -j -p link stat show link broadcast-link

[ {
        "link": "broadcast-link",
        "window": 50,
        "rx packets": {
            "rx packets": 0,
            "fragments": 0,
            "fragmented": 0,
            "bundles": 0,
            "bundled": 0
        },
        "tx packets": {
            "tx packets": 0,
            "fragments": 0,
            "fragmented": 0,
            "bundles": 0,
            "bundled": 0
        },
        "rx naks": {
            "rx naks": 0,
            "defs": 0,
            "dups": 0
        },
        "tx naks": {
            "tx naks": 0,
            "acks": 0,
            "retrans": 0
        },
        "congestion link": 0,
        "send queue max": 0,
        "avg": 0
    } ]

v2:
    Replace variable 'json_flag' by 'json' declared in include/utils.h

v3:
    Update manual page

Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au>
Signed-off-by: David Ahern <dsahern@gmail.com>

1 files changed, 272 insertions, 142 deletions

diff --git a/tipc/link.c b/tipc/link.c
index a2d7c001..afd3e68d 100644
--- a/tipc/link.c
+++ b/tipc/link.c
@@ -23,6 +23,11 @@
 #include "msg.h"
 #include "link.h"
 #include "bearer.h"
+#include "utils.h"
+
+#define PRIORITY_STR "priority"
+#define TOLERANCE_STR "tolerance"
+#define WINDOW_STR "window"
 
 static int link_list_cb(const struct nlmsghdr *nlh, void *data)
 {
@@ -38,13 +43,14 @@ static int link_list_cb(const struct nlmsghdr *nlh, void *data)
 	if (!attrs[TIPC_NLA_LINK_NAME])
 		return MNL_CB_ERROR;
 
-	printf("%s: ", mnl_attr_get_str(attrs[TIPC_NLA_LINK_NAME]));
-
+	print_string(PRINT_FP, NULL, "%s: ",
+			     mnl_attr_get_str(attrs[TIPC_NLA_LINK_NAME]));
 	if (attrs[TIPC_NLA_LINK_UP])
-		printf("up\n");
+		print_string(PRINT_ANY,
+			 mnl_attr_get_str(attrs[TIPC_NLA_LINK_NAME]),"%s\n", "up");
 	else
-		printf("down\n");
-
+		print_string(PRINT_ANY,
+			 mnl_attr_get_str(attrs[TIPC_NLA_LINK_NAME]), "%s\n", "down");
 	return MNL_CB_OK;
 }
 
@@ -52,6 +58,7 @@ static int cmd_link_list(struct nlmsghdr *nlh, const struct cmd *cmd,
 			 struct cmdl *cmdl, void *data)
 {
 	char buf[MNL_SOCKET_BUFFER_SIZE];
+	int err = 0;
 
 	if (help_flag) {
 		fprintf(stderr, "Usage: %s link list\n", cmdl->argv[0]);
@@ -64,7 +71,12 @@ static int cmd_link_list(struct nlmsghdr *nlh, const struct cmd *cmd,
 		return -1;
 	}
 
-	return msg_dumpit(nlh, link_list_cb, NULL);
+	new_json_obj(json);
+	open_json_object(NULL);
+	err = msg_dumpit(nlh, link_list_cb, NULL);
+	close_json_object();
+	delete_json_obj();
+	return err;
 }
 
 static int link_get_cb(const struct nlmsghdr *nlh, void *data)
@@ -87,8 +99,23 @@ static int link_get_cb(const struct nlmsghdr *nlh, void *data)
 	if (!props[*prop])
 		return MNL_CB_ERROR;
 
-	printf("%u\n", mnl_attr_get_u32(props[*prop]));
-
+	new_json_obj(json);
+	open_json_object(NULL);
+	switch (*prop) {
+		case TIPC_NLA_PROP_PRIO:
+			print_uint(PRINT_ANY, PRIORITY_STR, "%u\n", mnl_attr_get_u32(props[*prop]));
+		break;
+		case TIPC_NLA_PROP_TOL:
+			print_uint(PRINT_ANY, TOLERANCE_STR, "%u\n", mnl_attr_get_u32(props[*prop]));
+		break;
+		case TIPC_NLA_PROP_WIN:
+			print_uint(PRINT_ANY, WINDOW_STR, "%u\n", mnl_attr_get_u32(props[*prop]));
+		break;
+		default:
+			break;
+	}
+	close_json_object();
+	delete_json_obj();
 	return MNL_CB_OK;
 }
 
@@ -104,11 +131,11 @@ static int cmd_link_get_prop(struct nlmsghdr *nlh, const struct cmd *cmd,
 		{ NULL }
 	};
 
-	if (strcmp(cmd->cmd, "priority") == 0)
+	if (strcmp(cmd->cmd, PRIORITY_STR) == 0)
 		prop = TIPC_NLA_PROP_PRIO;
-	else if ((strcmp(cmd->cmd, "tolerance") == 0))
+	else if ((strcmp(cmd->cmd, TOLERANCE_STR) == 0))
 		prop = TIPC_NLA_PROP_TOL;
-	else if ((strcmp(cmd->cmd, "window") == 0))
+	else if ((strcmp(cmd->cmd, WINDOW_STR) == 0))
 		prop = TIPC_NLA_PROP_WIN;
 	else
 		return -EINVAL;
@@ -153,9 +180,9 @@ static int cmd_link_get(struct nlmsghdr *nlh, const struct cmd *cmd,
 			struct cmdl *cmdl, void *data)
 {
 	const struct cmd cmds[] = {
-		{ "priority",	cmd_link_get_prop,	cmd_link_get_help },
-		{ "tolerance",	cmd_link_get_prop,	cmd_link_get_help },
-		{ "window",	cmd_link_get_prop,	cmd_link_get_help },
+		{ PRIORITY_STR,	cmd_link_get_prop,	cmd_link_get_help },
+		{ TOLERANCE_STR,	cmd_link_get_prop,	cmd_link_get_help },
+		{ WINDOW_STR,	cmd_link_get_prop,	cmd_link_get_help },
 		{ NULL }
 	};
 
@@ -214,109 +241,178 @@ static uint32_t perc(uint32_t count, uint32_t total)
 	return (count * 100 + (total / 2)) / total;
 }
 
-static int _show_link_stat(struct nlattr *attrs[], struct nlattr *prop[],
-			   struct nlattr *stats[])
+static int _show_link_stat(const char *name, struct nlattr *attrs[],
+			   struct nlattr *prop[], struct nlattr *stats[])
 {
 	uint32_t proft;
 
+	open_json_object(NULL);
+
+	print_string(PRINT_ANY, "link", "\nLink <%s>\n", name);
+	print_string(PRINT_JSON, "state", "", NULL);
+	open_json_array(PRINT_JSON, NULL);
 	if (attrs[TIPC_NLA_LINK_ACTIVE])
-		printf("  ACTIVE");
+		print_string(PRINT_ANY, NULL, "  %s", "ACTIVE");
 	else if (attrs[TIPC_NLA_LINK_UP])
-		printf("  STANDBY");
+		print_string(PRINT_ANY, NULL, "  %s", "STANDBY");
 	else
-		printf("  DEFUNCT");
-
-	printf("  MTU:%u  Priority:%u  Tolerance:%u ms  Window:%u packets\n",
-	       mnl_attr_get_u32(attrs[TIPC_NLA_LINK_MTU]),
-	       mnl_attr_get_u32(prop[TIPC_NLA_PROP_PRIO]),
-	       mnl_attr_get_u32(prop[TIPC_NLA_PROP_TOL]),
-	       mnl_attr_get_u32(prop[TIPC_NLA_PROP_WIN]));
-
-	printf("  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
-	       mnl_attr_get_u32(attrs[TIPC_NLA_LINK_RX]) -
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
-
-	printf("  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
-	       mnl_attr_get_u32(attrs[TIPC_NLA_LINK_TX]) -
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
+		print_string(PRINT_ANY, NULL, "  %s", "DEFUNCT");
+	close_json_array(PRINT_JSON, NULL);
+
+	print_uint(PRINT_ANY, "mtu", "  MTU:%u",
+			   mnl_attr_get_u32(attrs[TIPC_NLA_LINK_MTU]));
+	print_uint(PRINT_ANY, PRIORITY_STR, "  Priority:%u",
+			   mnl_attr_get_u32(prop[TIPC_NLA_PROP_PRIO]));
+	print_uint(PRINT_ANY, TOLERANCE_STR, "  Tolerance:%u ms",
+			   mnl_attr_get_u32(prop[TIPC_NLA_PROP_TOL]));
+	print_uint(PRINT_ANY, WINDOW_STR, "  Window:%u packets\n",
+			   mnl_attr_get_u32(prop[TIPC_NLA_PROP_WIN]));
+
+	open_json_object("rx packets");
+	print_uint(PRINT_ANY, "rx packets", "  RX packets:%u",
+			   mnl_attr_get_u32(attrs[TIPC_NLA_LINK_RX]) -
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_INFO]));
+	print_uint(PRINT_ANY, "fragments", " fragments:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]));
+	print_uint(PRINT_ANY, "fragmented", "/%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]));
+	print_uint(PRINT_ANY, "bundles", " bundles:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]));
+	print_uint(PRINT_ANY, "bundled", "/%u\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
+	close_json_object();
+
+	open_json_object("tx packets");
+	print_uint(PRINT_ANY, "tx packets", "  TX packets:%u",
+			   mnl_attr_get_u32(attrs[TIPC_NLA_LINK_TX]) -
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_INFO]));
+	print_uint(PRINT_ANY, "fragments", " fragments:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]));
+	print_uint(PRINT_ANY, "fragmented", "/%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]));
+	print_uint(PRINT_ANY, "bundles", " bundles:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]));
+	print_uint(PRINT_ANY, "bundled", "/%u\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
+	close_json_object();
 
 	proft = mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT]);
-	printf("  TX profile sample:%u packets  average:%u octets\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_CNT]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_TOT]) / proft);
-
-	printf("  0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% -16384:%u%% -32768:%u%% -66000:%u%%\n",
-	       perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P0]), proft),
-	       perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P1]), proft),
-	       perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P2]), proft),
-	       perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P3]), proft),
-	       perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P4]), proft),
-	       perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P5]), proft),
-	       perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P6]), proft));
-
-	printf("  RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_STATES]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_PROBES]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
-
-	printf("  TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_STATES]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_PROBES]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
-
-	printf("  Congestion link:%u  Send queue max:%u avg:%u\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
-
+	print_uint(PRINT_ANY, "tx profile sample", "  TX profile sample:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_CNT]));
+	print_uint(PRINT_ANY, "packets average", " packets average:%u octets\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_TOT]) / proft);
+
+	print_uint(PRINT_ANY, "0-64", "  0-64:%u%%",
+			   perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P0]), proft));
+	print_uint(PRINT_ANY, "-256", " -256:%u%%",
+			   perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P1]), proft));
+	print_uint(PRINT_ANY, "-1024", " -1024:%u%%",
+			   perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P2]), proft));
+	print_uint(PRINT_ANY, "-4096", " -4096:%u%%",
+			   perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P3]), proft));
+	print_uint(PRINT_ANY, "-16384", " -16384:%u%%",
+			   perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P4]), proft));
+	print_uint(PRINT_ANY, "-32768", " -32768:%u%%",
+			   perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P5]), proft));
+	print_uint(PRINT_ANY, "-66000", " -66000:%u%%\n",
+			   perc(mnl_attr_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P6]), proft));
+
+	open_json_object("rx states");
+	print_uint(PRINT_ANY, "rx states", "  RX states:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_STATES]));
+	print_uint(PRINT_ANY, "probes", " probes:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_PROBES]));
+	print_uint(PRINT_ANY, "naks", " naks:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]));
+	print_uint(PRINT_ANY, "defs", " defs:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]));
+	print_uint(PRINT_ANY, "dups", " dups:%u\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
+	close_json_object();
+
+	open_json_object("tx states");
+	print_uint(PRINT_ANY, "tx states", "  TX states:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_STATES]));
+	print_uint(PRINT_ANY, "probes", " probes:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_PROBES]));
+	print_uint(PRINT_ANY, "naks", " naks:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]));
+	print_uint(PRINT_ANY, "acks", " acks:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]));
+	print_uint(PRINT_ANY, "retrans", " retrans:%u\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
+	close_json_object();
+
+	print_uint(PRINT_ANY, "congestion link", "  Congestion link:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]));
+	print_uint(PRINT_ANY, "send queue max", "  Send queue max:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]));
+	print_uint(PRINT_ANY, "avg", " avg:%u\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
+
+	close_json_object();
 	return MNL_CB_OK;
 }
 
-static int _show_bc_link_stat(struct nlattr *prop[], struct nlattr *stats[])
+static int _show_bc_link_stat(const char *name, struct nlattr *prop[],
+			   struct nlattr *stats[])
 {
-	printf("  Window:%u packets\n",
-	       mnl_attr_get_u32(prop[TIPC_NLA_PROP_WIN]));
-
-	printf("  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
-
-	printf("  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
-
-	printf("  RX naks:%u defs:%u dups:%u\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
-
-	printf("  TX naks:%u acks:%u dups:%u\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
-
-	printf("  Congestion link:%u  Send queue max:%u avg:%u\n",
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
-	       mnl_attr_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
+	open_json_object(NULL);
+	print_string(PRINT_ANY, "link", "Link <%s>\n", name);
+	print_uint(PRINT_ANY, WINDOW_STR, "  Window:%u packets\n",
+			   mnl_attr_get_u32(prop[TIPC_NLA_PROP_WIN]));
+
+	open_json_object("rx packets");
+	print_uint(PRINT_ANY, "rx packets", "  RX packets:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_INFO]));
+	print_uint(PRINT_ANY, "fragments", " fragments:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]));
+	print_uint(PRINT_ANY, "fragmented", "/%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]));
+	print_uint(PRINT_ANY, "bundles", " bundles:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]));
+	print_uint(PRINT_ANY, "bundled", "/%u\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
+	close_json_object();
+
+	open_json_object("tx packets");
+	print_uint(PRINT_ANY, "tx packets", "  TX packets:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_INFO]));
+	print_uint(PRINT_ANY, "fragments", " fragments:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]));
+	print_uint(PRINT_ANY, "fragmented", "/%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]));
+	print_uint(PRINT_ANY, "bundles", " bundles:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]));
+	print_uint(PRINT_ANY, "bundled", "/%u\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
+	close_json_object();
+
+	open_json_object("rx naks");
+	print_uint(PRINT_ANY, "rx naks", "  RX naks:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]));
+	print_uint(PRINT_ANY, "defs",  " defs:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]));
+	print_uint(PRINT_ANY, "dups",  " dups:%u\n",
+		   mnl_attr_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
+	close_json_object();
+
+	open_json_object("tx naks");
+	print_uint(PRINT_ANY, "tx naks", "  TX naks:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]));
+	print_uint(PRINT_ANY, "acks",  " acks:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]));
+	print_uint(PRINT_ANY, "retrans",  " retrans:%u\n",
+		   mnl_attr_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
+	close_json_object();
+
+	print_uint(PRINT_ANY, "congestion link", "  Congestion link:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]));
+	print_uint(PRINT_ANY, "send queue max", "  Send queue max:%u",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]));
+	print_uint(PRINT_ANY, "avg", " avg:%u\n",
+			   mnl_attr_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
+	close_json_object();
 
 	return MNL_CB_OK;
 }
@@ -350,13 +446,10 @@ static int link_stat_show_cb(const struct nlmsghdr *nlh, void *data)
 		return MNL_CB_OK;
 
 	if (attrs[TIPC_NLA_LINK_BROADCAST]) {
-		printf("Link <%s>\n", name);
-		return _show_bc_link_stat(prop, stats);
+		return _show_bc_link_stat(name, prop, stats);
 	}
 
-	printf("\nLink <%s>\n", name);
-
-	return _show_link_stat(attrs, prop, stats);
+	return _show_link_stat(name, attrs, prop, stats);
 }
 
 static void cmd_link_stat_show_help(struct cmdl *cmdl)
@@ -375,6 +468,7 @@ static int cmd_link_stat_show(struct nlmsghdr *nlh, const struct cmd *cmd,
 		{ "link",		OPT_KEYVAL,	NULL },
 		{ NULL }
 	};
+	int err = 0;
 
 	if (help_flag) {
 		(cmd->help)(cmdl);
@@ -394,7 +488,10 @@ static int cmd_link_stat_show(struct nlmsghdr *nlh, const struct cmd *cmd,
 	if (opt)
 		link = opt->val;
 
-	return msg_dumpit(nlh, link_stat_show_cb, link);
+	new_json_obj(json);
+	err = msg_dumpit(nlh, link_stat_show_cb, link);
+	delete_json_obj();
+	return err;
 }
 
 static void cmd_link_stat_help(struct cmdl *cmdl)
@@ -442,11 +539,11 @@ static int cmd_link_set_prop(struct nlmsghdr *nlh, const struct cmd *cmd,
 		{ NULL }
 	};
 
-	if (strcmp(cmd->cmd, "priority") == 0)
+	if (strcmp(cmd->cmd, PRIORITY_STR) == 0)
 		prop = TIPC_NLA_PROP_PRIO;
-	else if ((strcmp(cmd->cmd, "tolerance") == 0))
+	else if ((strcmp(cmd->cmd, TOLERANCE_STR) == 0))
 		prop = TIPC_NLA_PROP_TOL;
-	else if ((strcmp(cmd->cmd, "window") == 0))
+	else if ((strcmp(cmd->cmd, WINDOW_STR) == 0))
 		prop = TIPC_NLA_PROP_WIN;
 	else
 		return -EINVAL;
@@ -492,9 +589,9 @@ static int cmd_link_set(struct nlmsghdr *nlh, const struct cmd *cmd,
 			struct cmdl *cmdl, void *data)
 {
 	const struct cmd cmds[] = {
-		{ "priority",	cmd_link_set_prop,	cmd_link_set_help },
-		{ "tolerance",	cmd_link_set_prop,	cmd_link_set_help },
-		{ "window",	cmd_link_set_prop,	cmd_link_set_help },
+		{ PRIORITY_STR,	cmd_link_set_prop,	cmd_link_set_help },
+		{ TOLERANCE_STR,	cmd_link_set_prop,	cmd_link_set_help },
+		{ WINDOW_STR,	cmd_link_set_prop,	cmd_link_set_help },
 		{ NULL }
 	};
 
@@ -540,15 +637,17 @@ static int link_mon_summary_cb(const struct nlmsghdr *nlh, void *data)
 
 	mnl_attr_parse_nested(info[TIPC_NLA_MON], parse_attrs, attrs);
 
-	printf("\nbearer %s\n",
+	open_json_object(NULL);
+	print_string(PRINT_ANY, "bearer", "\nbearer %s\n",
 		mnl_attr_get_str(attrs[TIPC_NLA_MON_BEARER_NAME]));
 
-	printf("    table_generation %u\n",
+	print_uint(PRINT_ANY, "table_generation", "    table_generation %u\n",
 	       mnl_attr_get_u32(attrs[TIPC_NLA_MON_LISTGEN]));
-	printf("    cluster_size %u\n",
+	print_uint(PRINT_ANY, "cluster_size", "    cluster_size %u\n",
 		mnl_attr_get_u32(attrs[TIPC_NLA_MON_PEERCNT]));
-	printf("    algorithm %s\n",
+	print_string(PRINT_ANY, "algorithm", "    algorithm %s\n",
 		attrs[TIPC_NLA_MON_ACTIVE] ? "overlapping-ring" : "full-mesh");
+	close_json_object();
 
 	return MNL_CB_OK;
 }
@@ -557,6 +656,7 @@ static int cmd_link_mon_summary(struct nlmsghdr *nlh, const struct cmd *cmd,
 				struct cmdl *cmdl, void *data)
 {
 	char buf[MNL_SOCKET_BUFFER_SIZE];
+	int err = 0;
 
 	if (help_flag) {
 		fprintf(stderr,	"Usage: %s monitor summary\n", cmdl->argv[0]);
@@ -569,7 +669,11 @@ static int cmd_link_mon_summary(struct nlmsghdr *nlh, const struct cmd *cmd,
 		return -1;
 	}
 
-	return msg_dumpit(nlh, link_mon_summary_cb, NULL);
+	new_json_obj(json);
+	err = msg_dumpit(nlh, link_mon_summary_cb, NULL);
+	delete_json_obj();
+
+	return err;
 }
 
 #define STATUS_WIDTH 7
@@ -590,16 +694,19 @@ static int map_get(uint64_t up_map, int i)
 static void link_mon_print_applied(uint16_t applied, uint64_t up_map)
 {
 	int i;
-	char state;
 
+	open_json_array(PRINT_JSON, "applied_node_status");
 	for (i = 0; i < applied; i++) {
+		char state_str[2] = {0};
+
 		/* print the delimiter for every -n- entry */
 		if (i && !(i % APPL_NODE_STATUS_WIDTH))
-			printf(",");
+			print_string(PRINT_FP, NULL, "%s", ",");
 
-		state = map_get(up_map, i) ? 'U' : 'D';
-		printf("%c", state);
+		sprintf(state_str, "%c", map_get(up_map, i) ? 'U' : 'D');
+		print_string(PRINT_ANY, NULL, "%s", state_str);
 	}
+	close_json_array(PRINT_JSON, "applied_node_status");
 }
 
 /* print the non applied members, since we dont know
@@ -611,19 +718,23 @@ static void link_mon_print_non_applied(uint16_t applied, uint16_t member_cnt,
 	int i;
 	char state;
 
-	printf(" [");
+	open_json_array(PRINT_JSON, "[non_applied_node:status]");
+	print_string(PRINT_FP, NULL, " %s", "[");
 	for (i = applied; i < member_cnt; i++) {
 		char addr_str[16];
+		char full_state[17] = {0};
 
 		/* print the delimiter for every entry */
 		if (i != applied)
-			printf(",");
+			print_string(PRINT_FP, NULL, "%s", ",");
 
 		sprintf(addr_str, "%x:", members[i]);
 		state = map_get(up_map, i) ? 'U' : 'D';
-		printf("%s%c", addr_str, state);
+		sprintf(full_state, "%s%c", addr_str, state);
+		print_string(PRINT_ANY, NULL, "%s", full_state);
 	}
-	printf("]");
+	print_string(PRINT_FP, NULL, "%s", "]");
+	close_json_array(PRINT_JSON, "[non_applied_node:status]");
 }
 
 static void link_mon_print_peer_state(const uint32_t addr, const char *status,
@@ -634,11 +745,17 @@ static void link_mon_print_peer_state(const uint32_t addr, const char *status,
 
 	sprintf(addr_str, "%u.%u.%u", tipc_zone(addr), tipc_cluster(addr),
 		tipc_node(addr));
-
-	printf("%-*s", MAX_NODE_WIDTH, addr_str);
-	printf("%-*s", STATUS_WIDTH, status);
-	printf("%-*s", DIRECTLY_MON_WIDTH, monitored);
-	printf("%-*u", MAX_DOM_GEN_WIDTH, dom_gen);
+	if (is_json_context()) {
+		print_string(PRINT_JSON, "node", NULL, addr_str);
+		print_string(PRINT_JSON, "status", NULL, status);
+		print_string(PRINT_JSON, "monitored", NULL, monitored);
+		print_uint(PRINT_JSON, "generation", NULL, dom_gen);
+	} else {
+		printf("%-*s", MAX_NODE_WIDTH, addr_str);
+		printf("%-*s", STATUS_WIDTH, status);
+		printf("%-*s", DIRECTLY_MON_WIDTH, monitored);
+		printf("%-*u", MAX_DOM_GEN_WIDTH, dom_gen);
+	}
 }
 
 static int link_mon_peer_list_cb(const struct nlmsghdr *nlh, void *data)
@@ -657,6 +774,7 @@ static int link_mon_peer_list_cb(const struct nlmsghdr *nlh, void *data)
 	if (!info[TIPC_NLA_MON_PEER])
 		return MNL_CB_ERROR;
 
+	open_json_object(NULL);
 	mnl_attr_parse_nested(info[TIPC_NLA_MON_PEER], parse_attrs, attrs);
 
 	(attrs[TIPC_NLA_MON_PEER_LOCAL] || attrs[TIPC_NLA_MON_PEER_HEAD]) ?
@@ -691,8 +809,9 @@ static int link_mon_peer_list_cb(const struct nlmsghdr *nlh, void *data)
 				   mnl_attr_get_payload(attrs[TIPC_NLA_MON_PEER_MEMBERS]));
 
 exit:
-	printf("\n");
+	print_string(PRINT_FP, NULL, "\n", "");
 
+	close_json_object();
 	return MNL_CB_OK;
 }
 
@@ -701,6 +820,7 @@ static int link_mon_peer_list(uint32_t mon_ref)
 	struct nlmsghdr *nlh;
 	char buf[MNL_SOCKET_BUFFER_SIZE];
 	struct nlattr *nest;
+	int err = 0;
 
 	nlh = msg_init(buf, TIPC_NL_MON_PEER_GET);
 	if (!nlh) {
@@ -712,7 +832,8 @@ static int link_mon_peer_list(uint32_t mon_ref)
 	mnl_attr_put_u32(nlh, TIPC_NLA_MON_REF, mon_ref);
 	mnl_attr_nest_end(nlh, nest);
 
-	return msg_dumpit(nlh, link_mon_peer_list_cb, NULL);
+	err = msg_dumpit(nlh, link_mon_peer_list_cb, NULL);
+	return err;
 }
 
 static int link_mon_list_cb(const struct nlmsghdr *nlh, void *data)
@@ -736,12 +857,16 @@ static int link_mon_list_cb(const struct nlmsghdr *nlh, void *data)
 	if (*req_bearer && (strcmp(req_bearer, bname) != 0))
 		return MNL_CB_OK;
 
-	printf("\nbearer %s\n", bname);
-	printf("%s\n", title);
+	open_json_object(NULL);
+	print_string(PRINT_ANY, "bearer", "\nbearer %s\n", bname);
+	print_string(PRINT_FP, NULL, "%s\n", title);
 
+	open_json_array(PRINT_JSON, bname);
 	if (mnl_attr_get_u32(attrs[TIPC_NLA_MON_PEERCNT]))
 		link_mon_peer_list(mnl_attr_get_u32(attrs[TIPC_NLA_MON_REF]));
+	close_json_array(PRINT_JSON, bname);
 
+	close_json_object();
 	return MNL_CB_OK;
 }
 
@@ -807,7 +932,10 @@ static int cmd_link_mon_list(struct nlmsghdr *nlh, const struct cmd *cmd,
 		return -1;
 	}
 
-	return msg_dumpit(nlh, link_mon_list_cb, bname);
+	new_json_obj(json);
+	err = msg_dumpit(nlh, link_mon_list_cb, bname);
+	delete_json_obj();
+	return err;
 }
 
 static void cmd_link_mon_set_help(struct cmdl *cmdl)
@@ -851,8 +979,10 @@ static int link_mon_get_cb(const struct nlmsghdr *nlh, void *data)
 	if (!attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD])
 		return MNL_CB_ERROR;
 
-	printf("%u\n",
-	       mnl_attr_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]));
+	new_json_obj(json);
+	print_uint(PRINT_ANY, "threshold", "%u\n",
+			   mnl_attr_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]));
+	delete_json_obj();
 
 	return MNL_CB_OK;
 }