network: json: append nexthop information

src/network/networkd-json.c

@@ -1,10 +1,13 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include <linux/nexthop.h>
+
 #include "netif-util.h"
 #include "networkd-address.h"
 #include "networkd-json.h"
 #include "networkd-link.h"
 #include "networkd-manager.h"
+#include "networkd-nexthop.h"
 #include "networkd-network.h"
 #include "networkd-route-util.h"
 #include "networkd-route.h"
@@ -85,6 +88,116 @@ finalize:
         return r;
 }
 
+static int nexthop_group_build_json(NextHop *nexthop, JsonVariant **ret) {
+        JsonVariant **elements;
+        struct nexthop_grp *g;
+        size_t n = 0;
+        int r;
+
+        assert(nexthop);
+        assert(ret);
+
+        if (hashmap_isempty(nexthop->group)) {
+                *ret = NULL;
+                return 0;
+        }
+
+        elements = new(JsonVariant*, hashmap_size(nexthop->group));
+        if (!elements)
+                return -ENOMEM;
+
+        HASHMAP_FOREACH(g, nexthop->group) {
+                r = json_build(elements + n, JSON_BUILD_OBJECT(
+                                        JSON_BUILD_PAIR_UNSIGNED("ID", g->id),
+                                        JSON_BUILD_PAIR_UNSIGNED("Weight", g->weight+1)));
+                if (r < 0)
+                        goto failure;
+
+                n++;
+        }
+
+        r = json_variant_new_array(ret, elements, n);
+
+failure:
+        json_variant_unref_many(elements, n);
+        free(elements);
+        return r;
+}
+
+static int nexthop_build_json(NextHop *n, JsonVariant **ret) {
+        _cleanup_(json_variant_unrefp) JsonVariant *v = NULL, *group = NULL;
+        _cleanup_free_ char *flags = NULL, *protocol = NULL, *state = NULL;
+        int r;
+
+        assert(n);
+        assert(ret);
+
+        r = route_flags_to_string_alloc(n->flags, &flags);
+        if (r < 0)
+                return r;
+
+        r = route_protocol_to_string_alloc(n->protocol, &protocol);
+        if (r < 0)
+                return r;
+
+        r = network_config_state_to_string_alloc(n->state, &state);
+        if (r < 0)
+                return r;
+
+        r = nexthop_group_build_json(n, &group);
+        if (r < 0)
+                return r;
+
+        r = json_build(&v, JSON_BUILD_OBJECT(
+                                JSON_BUILD_PAIR_UNSIGNED("ID", n->id),
+                                JSON_BUILD_PAIR_IN_ADDR_NON_NULL("Gateway", &n->gw, n->family),
+                                JSON_BUILD_PAIR_UNSIGNED("Flags", n->flags),
+                                JSON_BUILD_PAIR_STRING("FlagsString", strempty(flags)),
+                                JSON_BUILD_PAIR_UNSIGNED("Protocol", n->protocol),
+                                JSON_BUILD_PAIR_STRING("ProtocolString", protocol),
+                                JSON_BUILD_PAIR_BOOLEAN("Blackhole", n->blackhole),
+                                JSON_BUILD_PAIR_VARIANT_NON_NULL("Group", group),
+                                JSON_BUILD_PAIR_STRING("ConfigSource", network_config_source_to_string(n->source)),
+                                JSON_BUILD_PAIR_STRING("ConfigState", state)));
+        if (r < 0)
+                return r;
+
+        *ret = TAKE_PTR(v);
+        return 0;
+}
+
+static int nexthops_build_json(Set *nexthops, JsonVariant **ret) {
+        JsonVariant **elements;
+        NextHop *nexthop;
+        size_t n = 0;
+        int r;
+
+        assert(ret);
+
+        if (set_isempty(nexthops)) {
+                *ret = NULL;
+                return 0;
+        }
+
+        elements = new(JsonVariant*, set_size(nexthops));
+        if (!elements)
+                return -ENOMEM;
+
+        SET_FOREACH(nexthop, nexthops) {
+                r = nexthop_build_json(nexthop, elements + n);
+                if (r < 0)
+                        goto finalize;
+                n++;
+        }
+
+        r = json_build(ret, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("NextHops", JSON_BUILD_VARIANT_ARRAY(elements, n))));
+
+finalize:
+        json_variant_unref_many(elements, n);
+        free(elements);
+        return r;
+}
+
 static int route_build_json(Route *route, JsonVariant **ret) {
         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
         _cleanup_free_ char *scope = NULL, *protocol = NULL, *table = NULL, *flags = NULL, *state = NULL;
@@ -279,6 +392,16 @@ int link_build_json(Link *link, JsonVariant **ret) {
 
         w = json_variant_unref(w);
 
+        r = nexthops_build_json(link->nexthops, &w);
+        if (r < 0)
+                return r;
+
+        r = json_variant_merge(&v, w);
+        if (r < 0)
+                return r;
+
+        w = json_variant_unref(w);
+
         r = routes_build_json(link->routes, &w);
         if (r < 0)
                 return r;
@@ -344,6 +467,16 @@ int manager_build_json(Manager *manager, JsonVariant **ret) {
         if (r < 0)
                 return r;
 
+        r = nexthops_build_json(manager->nexthops, &w);
+        if (r < 0)
+                return r;
+
+        r = json_variant_merge(&v, w);
+        if (r < 0)
+                return r;
+
+        w = json_variant_unref(w);
+
         r = routes_build_json(manager->routes, &w);
         if (r < 0)
                 return r;