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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "networkd-address-pool.h"
#include "networkd-address.h"
#include "networkd-manager.h"
#include "set.h"
#include "string-util.h"
#define RANDOM_PREFIX_TRIAL_MAX 1024
static int address_pool_new(
Manager *m,
int family,
const union in_addr_union *u,
unsigned prefixlen) {
_cleanup_free_ AddressPool *p = NULL;
int r;
assert(m);
assert(u);
p = new(AddressPool, 1);
if (!p)
return -ENOMEM;
*p = (AddressPool) {
.manager = m,
.family = family,
.prefixlen = prefixlen,
.in_addr = *u,
};
r = ordered_set_ensure_put(&m->address_pools, NULL, p);
if (r < 0)
return r;
TAKE_PTR(p);
return 0;
}
static int address_pool_new_from_string(
Manager *m,
int family,
const char *p,
unsigned prefixlen) {
union in_addr_union u;
int r;
assert(m);
assert(p);
r = in_addr_from_string(family, p, &u);
if (r < 0)
return r;
return address_pool_new(m, family, &u, prefixlen);
}
int address_pool_setup_default(Manager *m) {
int r;
assert(m);
/* Add in the well-known private address ranges. */
r = address_pool_new_from_string(m, AF_INET6, "fd00::", 8);
if (r < 0)
return r;
r = address_pool_new_from_string(m, AF_INET, "192.168.0.0", 16);
if (r < 0)
return r;
r = address_pool_new_from_string(m, AF_INET, "172.16.0.0", 12);
if (r < 0)
return r;
r = address_pool_new_from_string(m, AF_INET, "10.0.0.0", 8);
if (r < 0)
return r;
return 0;
}
static bool address_pool_prefix_is_taken(
AddressPool *p,
const union in_addr_union *u,
unsigned prefixlen) {
Link *l;
Network *n;
assert(p);
assert(u);
HASHMAP_FOREACH(l, p->manager->links_by_index) {
Address *a;
/* Don't clash with assigned addresses */
SET_FOREACH(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;
}
}
/* And don't clash with configured but un-assigned addresses either */
ORDERED_HASHMAP_FOREACH(n, p->manager->networks) {
Address *a;
ORDERED_HASHMAP_FOREACH(a, n->addresses_by_section) {
if (a->family != p->family)
continue;
if (in_addr_prefix_intersect(p->family, u, prefixlen, &a->in_addr, a->prefixlen))
return true;
}
}
return false;
}
static int address_pool_acquire_one(AddressPool *p, int family, unsigned prefixlen, union in_addr_union *found) {
union in_addr_union u;
int r;
assert(p);
assert(prefixlen > 0);
assert(found);
if (p->family != family)
return 0;
if (p->prefixlen >= prefixlen)
return 0;
u = p->in_addr;
for (unsigned i = 0; i < RANDOM_PREFIX_TRIAL_MAX; i++) {
r = in_addr_random_prefix(p->family, &u, p->prefixlen, prefixlen);
if (r <= 0)
return r;
if (!address_pool_prefix_is_taken(p, &u, prefixlen)) {
log_debug("Found range %s", IN_ADDR_PREFIX_TO_STRING(p->family, &u, prefixlen));
*found = u;
return 1;
}
}
return 0;
}
int address_pool_acquire(Manager *m, int family, unsigned prefixlen, union in_addr_union *found) {
AddressPool *p;
int r;
assert(m);
assert(IN_SET(family, AF_INET, AF_INET6));
assert(prefixlen > 0);
assert(found);
ORDERED_SET_FOREACH(p, m->address_pools) {
r = address_pool_acquire_one(p, family, prefixlen, found);
if (r != 0)
return r;
}
return 0;
}
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