summaryrefslogtreecommitdiffstats
path: root/src/network/networkd-address-pool.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/network/networkd-address-pool.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/src/network/networkd-address-pool.c b/src/network/networkd-address-pool.c
new file mode 100644
index 0000000..1650515
--- /dev/null
+++ b/src/network/networkd-address-pool.c
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "alloc-util.h"
+#include "networkd-address-pool.h"
+#include "networkd-manager.h"
+#include "set.h"
+#include "string-util.h"
+
+int address_pool_new(
+ Manager *m,
+ AddressPool **ret,
+ int family,
+ const union in_addr_union *u,
+ unsigned prefixlen) {
+
+ AddressPool *p;
+
+ assert(m);
+ assert(ret);
+ assert(u);
+
+ p = new(AddressPool, 1);
+ if (!p)
+ return -ENOMEM;
+
+ *p = (AddressPool) {
+ .manager = m,
+ .family = family,
+ .prefixlen = prefixlen,
+ .in_addr = *u,
+ };
+
+ LIST_PREPEND(address_pools, m->address_pools, p);
+
+ *ret = p;
+ return 0;
+}
+
+int address_pool_new_from_string(
+ Manager *m,
+ AddressPool **ret,
+ int family,
+ const char *p,
+ unsigned prefixlen) {
+
+ union in_addr_union u;
+ int r;
+
+ assert(m);
+ assert(ret);
+ assert(p);
+
+ r = in_addr_from_string(family, p, &u);
+ if (r < 0)
+ return r;
+
+ return address_pool_new(m, ret, family, &u, prefixlen);
+}
+
+void address_pool_free(AddressPool *p) {
+
+ if (!p)
+ return;
+
+ if (p->manager)
+ LIST_REMOVE(address_pools, p->manager->address_pools, p);
+
+ free(p);
+}
+
+static bool address_pool_prefix_is_taken(
+ AddressPool *p,
+ const union in_addr_union *u,
+ unsigned prefixlen) {
+
+ Iterator i;
+ Link *l;
+ Network *n;
+
+ assert(p);
+ assert(u);
+
+ HASHMAP_FOREACH(l, p->manager->links, i) {
+ Address *a;
+ Iterator j;
+
+ /* Don't clash with assigned addresses */
+ SET_FOREACH(a, l->addresses, j) {
+ if (a->family != p->family)
+ continue;
+
+ if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen))
+ return true;
+ }
+
+ /* Don't clash with addresses already pulled from the pool, but not assigned yet */
+ LIST_FOREACH(addresses, a, l->pool_addresses) {
+ if (a->family != p->family)
+ continue;
+
+ if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen))
+ return true;
+ }
+ }
+
+ /* And don't clash with configured but un-assigned addresses either */
+ LIST_FOREACH(networks, n, p->manager->networks) {
+ Address *a;
+
+ LIST_FOREACH(addresses, a, n->static_addresses) {
+ if (a->family != p->family)
+ continue;
+
+ if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen))
+ return true;
+ }
+ }
+
+ return false;
+}
+
+int address_pool_acquire(AddressPool *p, unsigned prefixlen, union in_addr_union *found) {
+ union in_addr_union u;
+
+ assert(p);
+ assert(prefixlen > 0);
+ assert(found);
+
+ if (p->prefixlen > prefixlen)
+ return 0;
+
+ u = p->in_addr;
+ for (;;) {
+ if (!address_pool_prefix_is_taken(p, &u, prefixlen)) {
+ _cleanup_free_ char *s = NULL;
+ int r;
+
+ r = in_addr_to_string(p->family, &u, &s);
+ if (r < 0)
+ return r;
+
+ log_debug("Found range %s/%u", strna(s), prefixlen);
+
+ *found = u;
+ return 1;
+ }
+
+ if (!in_addr_prefix_next(p->family, &u, prefixlen))
+ return 0;
+
+ if (!in_addr_prefix_intersect(p->family, &p->in_addr, p->prefixlen, &u, prefixlen))
+ return 0;
+ }
+
+ return 0;
+}