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util: make local_gateways() support RT_VIA and RT_MULTIPATH

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Then, `networkctl status` correctly shows gateways.
This commit is contained in:
Yu Watanabe 2020-10-07 19:39:59 +09:00
parent f9bb333832
commit bff94a84c2
1 changed files with 88 additions and 31 deletions
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119
src/shared/local-addresses.c
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@ -142,11 +142,40 @@ int local_addresses(sd_netlink *context, int ifindex, int af, struct local_addre
return (int) n_list;
}
static int add_local_gateway(
struct local_address **list,
size_t *n_list,
size_t *n_allocated,
int af,
int ifindex,
uint32_t metric,
const RouteVia *via) {
assert(list);
assert(n_list);
assert(n_allocated);
assert(via);
if (af != AF_UNSPEC && af != via->family)
return 0;
if (!GREEDY_REALLOC(*list, *n_allocated, *n_list + 1))
return -ENOMEM;
(*list)[(*n_list)++] = (struct local_address) {
.ifindex = ifindex,
.metric = metric,
.family = via->family,
.address = via->address,
};
return 0;
}
int local_gateways(sd_netlink *context, int ifindex, int af, struct local_address **ret) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
_cleanup_free_ struct local_address *list = NULL;
sd_netlink_message *m = NULL;
size_t n_list = 0, n_allocated = 0;
int r;
@ -172,12 +201,16 @@ int local_gateways(sd_netlink *context, int ifindex, int af, struct local_addres
if (r < 0)
return r;
for (m = reply; m; m = sd_netlink_message_next(m)) {
struct local_address *a;
for (sd_netlink_message *m = reply; m; m = sd_netlink_message_next(m)) {
_cleanup_ordered_set_free_free_ OrderedSet *multipath_routes = NULL;
_cleanup_free_ void *rta_multipath = NULL;
union in_addr_union gateway;
uint16_t type;
unsigned char dst_len, src_len, table;
uint32_t ifi;
uint32_t ifi, metric = 0;
size_t rta_len;
int family;
RouteVia via;
r = sd_netlink_message_get_errno(m);
if (r < 0)
@ -208,48 +241,72 @@ int local_gateways(sd_netlink *context, int ifindex, int af, struct local_addres
if (table != RT_TABLE_MAIN)
continue;
r = sd_netlink_message_read_u32(m, RTA_OIF, &ifi);
if (r == -ENODATA) /* Not all routes have an RTA_OIF attribute (for example nexthop ones) */
continue;
if (r < 0)
r = sd_netlink_message_read_u32(m, RTA_PRIORITY, &metric);
if (r < 0 && r != -ENODATA)
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)
if (!IN_SET(family, AF_INET, AF_INET6))
continue;
if (!GREEDY_REALLOC0(list, n_allocated, n_list + 1))
return -ENOMEM;
a = list + n_list;
switch (family) {
case AF_INET:
r = sd_netlink_message_read_in_addr(m, RTA_GATEWAY, &a->address.in);
if (r < 0)
r = sd_netlink_message_read_u32(m, RTA_OIF, &ifi);
if (r < 0 && r != -ENODATA)
return r;
if (r >= 0) {
if (ifi <= 0)
return -EINVAL;
if (ifindex > 0 && (int) ifi != ifindex)
continue;
break;
case AF_INET6:
r = sd_netlink_message_read_in6_addr(m, RTA_GATEWAY, &a->address.in6);
if (r < 0)
r = netlink_message_read_in_addr_union(m, RTA_GATEWAY, family, &gateway);
if (r < 0 && r != -ENODATA)
return r;
if (r >= 0) {
via.family = family;
via.address = gateway;
r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &via);
if (r < 0)
return r;
continue;
}
if (family != AF_INET)
continue;
break;
default:
continue;
r = sd_netlink_message_read(m, RTA_VIA, sizeof(via), &via);
if (r < 0 && r != -ENODATA)
return r;
if (r >= 0) {
r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &via);
if (r < 0)
return r;
continue;
}
}
sd_netlink_message_read_u32(m, RTA_PRIORITY, &a->metric);
r = sd_netlink_message_read_data(m, RTA_MULTIPATH, &rta_len, &rta_multipath);
if (r < 0 && r != -ENODATA)
return r;
if (r >= 0) {
MultipathRoute *mr;
a->ifindex = ifi;
a->family = family;
r = rtattr_read_nexthop(rta_multipath, rta_len, family, &multipath_routes);
if (r < 0)
return r;
n_list++;
ORDERED_SET_FOREACH(mr, multipath_routes) {
if (ifindex > 0 && mr->ifindex != ifindex)
continue;
r = add_local_gateway(&list, &n_list, &n_allocated, af, ifi, metric, &mr->gateway);
if (r < 0)
return r;
}
}
}
typesafe_qsort(list, n_list, address_compare);