+ if (n_list > 0)
+ qsort(list, n_list, sizeof(struct local_address), address_compare);
+
+ *ret = list;
+ list = NULL;
+
+ return (int) n_list;
+}
+
+int local_gateways(sd_rtnl *context, int ifindex, int af, struct local_address **ret) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
+ _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ _cleanup_free_ struct local_address *list = NULL;
+ sd_rtnl_message *m = NULL;
+ size_t n_list = 0, n_allocated = 0;
+ int r;
+
+ assert(ret);
+
+ if (context)
+ rtnl = sd_rtnl_ref(context);
+ else {
+ r = sd_rtnl_open(&rtnl, 0);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_rtnl_message_new_route(rtnl, &req, RTM_GETROUTE, af, RTPROT_UNSPEC);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_request_dump(req, true);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call(rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (m = reply; m; m = sd_rtnl_message_next(m)) {
+ struct local_address *a;
+ uint16_t type;
+ unsigned char dst_len, src_len;
+ uint32_t ifi;
+ int family;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_get_type(m, &type);
+ if (r < 0)
+ return r;
+ if (type != RTM_NEWROUTE)
+ continue;
+
+ /* We only care for default routes */
+ r = sd_rtnl_message_route_get_dst_prefixlen(m, &dst_len);
+ if (r < 0)
+ return r;
+ if (dst_len != 0)
+ continue;
+
+ r = sd_rtnl_message_route_get_src_prefixlen(m, &src_len);
+ if (r < 0)
+ return r;
+ if (src_len != 0)
+ continue;
+
+ r = sd_rtnl_message_read_u32(m, RTA_OIF, &ifi);
+ if (r < 0)
+ return r;
+ if (ifindex > 0 && (int) ifi != ifindex)
+ continue;
+
+ r = sd_rtnl_message_route_get_family(m, &family);
+ if (r < 0)
+ return r;
+ if (af != AF_UNSPEC && af != family)
+ continue;
+
+ if (!GREEDY_REALLOC0(list, n_allocated, n_list + 1))
+ return -ENOMEM;
+
+ a = list + n_list;
+
+ switch (family) {
+ case AF_INET:
+ r = sd_rtnl_message_read_in_addr(m, RTA_GATEWAY, &a->address.in);
+ if (r < 0)
+ continue;
+
+ break;
+ case AF_INET6:
+ r = sd_rtnl_message_read_in6_addr(m, RTA_GATEWAY, &a->address.in6);
+ if (r < 0)
+ continue;
+
+ break;
+ default:
+ continue;
+ }
+
+ sd_rtnl_message_read_u32(m, RTA_PRIORITY, &a->metric);
+
+ a->ifindex = ifi;
+ a->family = family;
+
+ n_list++;
+ }
+
+ if (n_list > 0)