+
+ update_static_assignments(iface);
+ } else if (iface->dhcpv4_assignments.next) {
+ while (!list_empty(&iface->dhcpv4_assignments))
+ free_dhcpv4_assignment(list_first_entry(&iface->dhcpv4_assignments,
+ struct dhcpv4_assignment, head));
+ }
+ return 0;
+}
+
+
+static void dhcpv4_netevent_cb(unsigned long event, struct netevent_handler_info *info)
+{
+ struct interface *iface = info->iface;
+
+ if (!iface || iface->dhcpv4 == MODE_DISABLED)
+ return;
+
+ switch (event) {
+ case NETEV_IFINDEX_CHANGE:
+ dhcpv4_setup_interface(iface, true);
+ break;
+ case NETEV_ADDRLIST_CHANGE:
+ handle_addrlist_change(iface);
+ break;
+ default:
+ break;
+ }
+}
+
+static struct dhcpv4_assignment *find_assignment_by_hwaddr(struct interface *iface, const uint8_t *hwaddr)
+{
+ struct dhcpv4_assignment *a;
+
+ list_for_each_entry(a, &iface->dhcpv4_assignments, head)
+ if (!memcmp(a->hwaddr, hwaddr, 6))
+ return a;
+
+ return NULL;
+}
+
+static struct dhcpv4_assignment *find_assignment_by_addr(struct interface *iface, const uint32_t addr)
+{
+ struct dhcpv4_assignment *a;
+
+ list_for_each_entry(a, &iface->dhcpv4_assignments, head)
+ if (a->addr == addr)
+ return a;
+
+ return NULL;
+}
+
+static int setup_dhcpv4_addresses(struct interface *iface)
+{
+ iface->dhcpv4_start_ip.s_addr = INADDR_ANY;
+ iface->dhcpv4_end_ip.s_addr = INADDR_ANY;
+ iface->dhcpv4_local.s_addr = INADDR_ANY;
+ iface->dhcpv4_bcast.s_addr = INADDR_ANY;
+ iface->dhcpv4_mask.s_addr = INADDR_ANY;
+
+ /* Sanity checks */
+ if (iface->dhcpv4_start.s_addr & htonl(0xffff0000) ||
+ iface->dhcpv4_end.s_addr & htonl(0xffff0000) ||
+ ntohl(iface->dhcpv4_start.s_addr) > ntohl(iface->dhcpv4_end.s_addr)) {
+ syslog(LOG_ERR, "invalid DHCP range for %s", iface->name);
+ return -1;
+ }
+
+ if (!iface->addr4_len) {
+ syslog(LOG_WARNING, "no network(s) available on %s", iface->name);
+ return -1;
+ }
+
+ uint32_t start = ntohl(iface->dhcpv4_start.s_addr);
+ uint32_t end = ntohl(iface->dhcpv4_end.s_addr);
+
+ for (size_t i = 0; i < iface->addr4_len && start && end; i++) {
+ struct in_addr *addr = &iface->addr4[i].addr.in;
+ struct in_addr mask;
+
+ odhcpd_bitlen2netmask(false, iface->addr4[i].prefix, &mask);
+ if ((start & ntohl(~mask.s_addr)) == start &&
+ (end & ntohl(~mask.s_addr)) == end) {
+ iface->dhcpv4_start_ip.s_addr = htonl(start) |
+ (addr->s_addr & mask.s_addr);
+ iface->dhcpv4_end_ip.s_addr = htonl(end) |
+ (addr->s_addr & mask.s_addr);
+ iface->dhcpv4_local = *addr;
+ iface->dhcpv4_bcast = iface->addr4[i].broadcast;
+ iface->dhcpv4_mask = mask;
+ return 0;