/* 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) { 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; } /* Don't clash with addresses already pulled from the pool, but not assigned yet */ SET_FOREACH(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 */ 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; unsigned i; 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 (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)) { if (DEBUG_LOGGING) { _cleanup_free_ char *s = NULL; (void) in_addr_to_string(p->family, &u, &s); log_debug("Found range %s/%u", strna(s), 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; }