+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <arpa/inet.h>
+
+#include "networkd.h"
+
+int address_pool_new(
+ Manager *m,
+ AddressPool **ret,
+ unsigned family,
+ const union in_addr_union *u,
+ unsigned prefixlen) {
+
+ AddressPool *p;
+
+ assert(m);
+ assert(ret);
+ assert(u);
+
+ p = new0(AddressPool, 1);
+ if (!p)
+ return -ENOMEM;
+
+ p->manager = m;
+ p->family = family;
+ p->prefixlen = prefixlen;
+ p->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,
+ unsigned 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;
+
+ /* Don't clash with assigned addresses */
+ LIST_FOREACH(addresses, a, l->addresses) {
+ 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;
+
+ in_addr_to_string(p->family, &u, &s);
+ 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;
+}
~ianmdlvl / elogind.git / commitdiff