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Message-Id: <20190926152934.9121-1-julien@cumulusnetworks.com>
Date: Thu, 26 Sep 2019 17:29:34 +0200
From: Julien Fortin <julien@...ulusnetworks.com>
To: netdev@...r.kernel.org
Cc: roopa@...ulusnetworks.com, dsahern@...il.com,
Julien Fortin <julien@...ulusnetworks.com>
Subject: [PATCH iproute2(-next) v2 1/1] ip: fix ip route show json output for multipath nexthops
From: Julien Fortin <julien@...ulusnetworks.com>
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: 663c3cb23103f4 ("iproute: implement JSON and color output")
Signed-off-by: Julien Fortin <julien@...ulusnetworks.com>
---
ip/iproute.c | 46 ++++++++++++++++++++++++++++------------------
1 file changed, 28 insertions(+), 18 deletions(-)
diff --git a/ip/iproute.c b/ip/iproute.c
index a4533851..32bb52df 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -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()) {
- if ((r->rtm_flags & RTM_F_CLONED) &&
- r->rtm_type == RTN_MULTICAST) {
- if (first) {
- fprintf(fp, "Oifs: ");
- first = 0;
- } else {
- fprintf(fp, " ");
- }
- } else
- fprintf(fp, "%s\tnexthop ", _SL_);
- }
+ open_json_object(NULL);
+
+ if ((r->rtm_flags & RTM_F_CLONED) &&
+ r->rtm_type == RTN_MULTICAST) {
+ if (first) {
+ print_string(PRINT_FP, NULL, "Oifs: ", NULL);
+ first = 0;
+ } else {
+ print_string(PRINT_FP, NULL, " ", NULL);
+ }
+ } else
+ 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)
--
2.23.0
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