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ip: fix ip route show json output for multipath nexthops

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print_rta_multipath doesn't support JSON output:

{
    "dst":"27.0.0.13",
    "protocol":"bgp",
    "metric":20,
    "flags":[],
    "gateway":"169.254.0.1"dev uplink-1 weight 1 ,
    "flags":["onlink"],
    "gateway":"169.254.0.1"dev uplink-2 weight 1 ,
    "flags":["onlink"]
},

since RTA_MULTIPATH has nested objects we should print them
in a json array.

With the path we have the following output:

{
    "flags": [],
    "dst": "36.0.0.13",
    "protocol": "bgp",
    "metric": 20,
    "nexthops": [
        {
            "weight": 1,
            "flags": [
                "onlink"
            ],
            "gateway": "169.254.0.1",
            "dev": "uplink-1"
        },
        {
            "weight": 1,
            "flags": [
                "onlink"
            ],
            "gateway": "169.254.0.1",
            "dev": "uplink-2"
        }
    ]
}

Fixes: 663c3cb231 ("iproute: implement JSON and color output")

Signed-off-by: Julien Fortin <julien@cumulusnetworks.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Julien Fortin 2019-09-26 17:29:34 +02:00 committed by Stephen Hemminger
parent 6749801b06
commit 4f73cd7f0d
1 changed files with 28 additions and 18 deletions
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32
ip/iproute.c
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@ -649,24 +649,26 @@ static void print_rta_multipath(FILE *fp, const struct rtmsg *r,
int len = RTA_PAYLOAD(rta);
int first = 1;
open_json_array(PRINT_JSON, "nexthops");
while (len >= sizeof(*nh)) {
struct rtattr *tb[RTA_MAX + 1];
if (nh->rtnh_len > len)
break;
if (!is_json_context()) {
open_json_object(NULL);
if ((r->rtm_flags & RTM_F_CLONED) &&
r->rtm_type == RTN_MULTICAST) {
if (first) {
fprintf(fp, "Oifs: ");
print_string(PRINT_FP, NULL, "Oifs: ", NULL);
first = 0;
} else {
fprintf(fp, " ");
print_string(PRINT_FP, NULL, " ", NULL);
}
} else
fprintf(fp, "%s\tnexthop ", _SL_);
}
print_string(PRINT_FP, NULL, "%s\tnexthop ", _SL_);
if (nh->rtnh_len > sizeof(*nh)) {
parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh),
@ -689,22 +691,30 @@ static void print_rta_multipath(FILE *fp, const struct rtmsg *r,
if ((r->rtm_flags & RTM_F_CLONED) &&
r->rtm_type == RTN_MULTICAST) {
fprintf(fp, "%s", ll_index_to_name(nh->rtnh_ifindex));
print_string(PRINT_ANY, "dev",
"%s", ll_index_to_name(nh->rtnh_ifindex));
if (nh->rtnh_hops != 1)
fprintf(fp, "(ttl>%d)", nh->rtnh_hops);
fprintf(fp, " ");
print_int(PRINT_ANY, "ttl", "(ttl>%d)", nh->rtnh_hops);
print_string(PRINT_FP, NULL, " ", NULL);
} else {
fprintf(fp, "dev %s ", ll_index_to_name(nh->rtnh_ifindex));
print_string(PRINT_ANY, "dev",
"dev %s ", ll_index_to_name(nh->rtnh_ifindex));
if (r->rtm_family != AF_MPLS)
fprintf(fp, "weight %d ",
nh->rtnh_hops+1);
print_int(PRINT_ANY, "weight",
"weight %d ", nh->rtnh_hops + 1);
}
print_rt_flags(fp, nh->rtnh_flags);
len -= NLMSG_ALIGN(nh->rtnh_len);
nh = RTNH_NEXT(nh);
close_json_object();
}
close_json_array(PRINT_JSON, NULL);
}
int print_route(struct nlmsghdr *n, void *arg)