[PATCH 24/27] ip: link_vti.c: add json output support

[Julien Fortin]

From: Julien Fortin <jul...@cumulusnetworks.com>

Schema:
{
    "remote": {
        "type": "string",
        "attr": "IFLA_VTI_REMOTE"
    },
    "local": {
        "type": "string",
        "attr": "IFLA_VTI_LOCAL"
    },
    "link": {
        "type": "string",
        "attr": "IFLA_VTI_LINK",
        "mutually_exclusive": {
            "link_index": {
                "type": "uint",
            }
        }
    },
    "ikey": {
        "type": "string",
        "attr": "IFLA_VTI_IKEY"
    },
    "okey": {
        "type": "string",
        "attr": "IFLA_VTI_OKEY"
    }
}

$ ip tunnel add vti0 mode vti local 192.0.2.1 remote 198.51.100.3
$ ip link show
10: ip_vti0@NONE: <NOARP> mtu 1428 qdisc noop state DOWN mode DEFAULT group
default
    link/ipip 0.0.0.0 brd 0.0.0.0
11: vti0@NONE: <POINTOPOINT,NOARP> mtu 1428 qdisc noop state DOWN mode
DEFAULT group default
    link/ipip 192.0.2.1 peer 198.51.100.3
$ ./ip -details -json link show
[{
        "ifindex": 10,
        "ifname": "ip_vti0",
        "link": null,
        "flags": ["NOARP"],
        "mtu": 1428,
        "qdisc": "noop",
        "operstate": "DOWN",
        "linkmode": "DEFAULT",
        "group": "default",
        "link_type": "ipip",
        "address": "0.0.0.0",
        "broadcast": "0.0.0.0",
        "promiscuity": 0,
        "linkinfo": {
            "info_kind": "vti",
            "info_data": {
                "remote": "any",
                "local": "any",
                "ikey": "0.0.0.0",
                "okey": "0.0.0.0"
            }
        },
        "inet6_addr_gen_mode": "eui64",
        "num_tx_queues": 1,
        "num_rx_queues": 1,
        "gso_max_size": 65536,
        "gso_max_segs": 65535
    },{
        "ifindex": 11,
        "ifname": "vti0",
        "link": null,
        "flags": ["POINTOPOINT","NOARP"],
        "mtu": 1428,
        "qdisc": "noop",
        "operstate": "DOWN",
        "linkmode": "DEFAULT",
        "group": "default",
        "link_type": "ipip",
        "address": "192.0.2.1",
        "link_pointtopoint": true,
        "broadcast": "198.51.100.3",
        "promiscuity": 0,
        "linkinfo": {
            "info_kind": "vti",
            "info_data": {
                "remote": "198.51.100.3",
                "local": "192.0.2.1",
                "ikey": "0.0.0.0",
                "okey": "0.0.0.0"
            }
        },
        "inet6_addr_gen_mode": "eui64",
        "num_tx_queues": 1,
        "num_rx_queues": 1,
        "gso_max_size": 65536,
        "gso_max_segs": 65535
    }
]
$

Signed-off-by: Julien Fortin <jul...@cumulusnetworks.com>
---
 ip/link_vti.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/ip/link_vti.c b/ip/link_vti.c
index d5242ac7..74336aff 100644
--- a/ip/link_vti.c
+++ b/ip/link_vti.c
@@ -223,7 +223,7 @@ static void vti_print_opt(struct link_util *lu, FILE *f, 
struct rtattr *tb[])
                        remote = format_host(AF_INET, 4, &addr);
        }
 
-       fprintf(f, "remote %s ", remote);
+       print_string(PRINT_ANY, "remote", "remote %s ", remote);
 
        if (tb[IFLA_VTI_LOCAL]) {
                unsigned int addr = rta_getattr_u32(tb[IFLA_VTI_LOCAL]);
@@ -232,31 +232,36 @@ static void vti_print_opt(struct link_util *lu, FILE *f, 
struct rtattr *tb[])
                        local = format_host(AF_INET, 4, &addr);
        }
 
-       fprintf(f, "local %s ", local);
+       print_string(PRINT_ANY, "local", "local %s ", local);
 
        if (tb[IFLA_VTI_LINK] &&
            (link = rta_getattr_u32(tb[IFLA_VTI_LINK]))) {
                const char *n = if_indextoname(link, s2);
 
                if (n)
-                       fprintf(f, "dev %s ", n);
+                       print_string(PRINT_ANY, "link", "dev %s ", n);
                else
-                       fprintf(f, "dev %u ", link);
+                       print_uint(PRINT_ANY, "link_index", "dev %u ", link);
        }
 
        if (tb[IFLA_VTI_IKEY]) {
                inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
-               fprintf(f, "ikey %s ", s2);
+               print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
        }
 
        if (tb[IFLA_VTI_OKEY]) {
                inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
-               fprintf(f, "okey %s ", s2);
+               print_string(PRINT_ANY, "okey", "okey %s ", s2);
        }
 
-       if (tb[IFLA_VTI_FWMARK] && rta_getattr_u32(tb[IFLA_VTI_FWMARK])) {
-               fprintf(f, "fwmark 0x%x ",
-                       rta_getattr_u32(tb[IFLA_VTI_FWMARK]));
+       if (tb[IFLA_VTI_FWMARK]) {
+               __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]);
+
+               if (fwmark) {
+                       snprintf(s2, sizeof(s2), "0x%x", fwmark);
+
+                       print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
+               }
        }
 }
 
-- 
2.13.3