diff options
Diffstat (limited to 'src/network/networkd-address-pool.c')
| -rw-r--r-- | src/network/networkd-address-pool.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/network/networkd-address-pool.c b/src/network/networkd-address-pool.c new file mode 100644 index 0000000000..a5079add02 --- /dev/null +++ b/src/network/networkd-address-pool.c @@ -0,0 +1,166 @@ +/*-*- 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; +} |