DHCPV4_MIN_PACKET_SIZE : (uint8_t *)end - (uint8_t *)start)
#define MAX_PREFIX_LEN 28
-static bool addr_is_fr_ip(struct interface *iface, struct in_addr *addr);
static void dhcpv4_fr_rand_delay(struct dhcp_assignment *a);
-static struct dhcp_assignment* dhcpv4_lease(struct interface *iface,
- enum dhcpv4_msg msg, const uint8_t *mac, const uint32_t reqaddr,
- uint32_t *leasetime, const char *hostname, const size_t hostname_len,
- const bool accept_fr_nonce, bool *incl_fr_opt, uint32_t *fr_serverid,
- const uint8_t *reqopts, const size_t reqopts_len);
static uint32_t serial = 0;
a->fr_timer.cb = dhcpv4_fr_delay_timer;
}
+static void dhcpv4_free_assignment(struct dhcp_assignment *a)
+{
+ if (a->fr_ip)
+ dhcpv4_fr_stop(a);
+}
+
+static bool dhcpv4_insert_assignment(struct list_head *list, struct dhcp_assignment *a,
+ uint32_t addr)
+{
+ uint32_t h_addr = ntohl(addr);
+ struct dhcp_assignment *c;
+
+ list_for_each_entry(c, list, head) {
+ uint32_t c_addr = ntohl(c->addr);
+
+ if (c_addr == h_addr)
+ return false;
+
+ if (c_addr > h_addr)
+ break;
+ }
+
+ /* Insert new node before c (might match list head) */
+ a->addr = addr;
+ list_add_tail(&a->head, &c->head);
+
+ return true;
+}
+
+static bool dhcpv4_assign(struct interface *iface, struct dhcp_assignment *a,
+ uint32_t raddr)
+{
+ uint32_t start = ntohl(iface->dhcpv4_start_ip.s_addr);
+ uint32_t end = ntohl(iface->dhcpv4_end_ip.s_addr);
+ uint32_t count = end - start + 1;
+ uint32_t seed = 0;
+ bool assigned;
+ char buf[INET_ADDRSTRLEN];
+
+ /* Preconfigured IP address by static lease */
+ if (a->addr) {
+ assigned = dhcpv4_insert_assignment(&iface->dhcpv4_assignments,
+ a, a->addr);
+
+ if (assigned)
+ syslog(LOG_DEBUG, "Assigning static IP: %s",
+ inet_ntop(AF_INET, &a->addr, buf, sizeof(buf)));
+
+ return assigned;
+ }
+
+ /* try to assign the IP the client asked for */
+ if (start <= ntohl(raddr) && ntohl(raddr) <= end &&
+ !config_find_lease_by_ipaddr(raddr)) {
+ assigned = dhcpv4_insert_assignment(&iface->dhcpv4_assignments,
+ a, raddr);
+
+ if (assigned) {
+ syslog(LOG_DEBUG, "Assigning the IP the client asked for: %s",
+ inet_ntop(AF_INET, &a->addr, buf, sizeof(buf)));
+ return true;
+ }
+ }
+
+ /* Seed RNG with checksum of hwaddress */
+ for (size_t i = 0; i < sizeof(a->hwaddr); ++i) {
+ /* Knuth's multiplicative method */
+ uint8_t o = a->hwaddr[i];
+ seed += (o*2654435761) % UINT32_MAX;
+ }
+
+ srand(seed);
+
+ for (uint32_t i = 0, try = (((uint32_t)rand()) % count) + start; i < count;
+ ++i, try = (((try - start) + 1) % count) + start) {
+ uint32_t n_try = htonl(try);
+
+ if (config_find_lease_by_ipaddr(n_try))
+ continue;
+
+ assigned = dhcpv4_insert_assignment(&iface->dhcpv4_assignments,
+ a, n_try);
+
+ if (assigned) {
+ syslog(LOG_DEBUG, "Assigning mapped IP: %s (try %u of %u)",
+ inet_ntop(AF_INET, &a->addr, buf, sizeof(buf)),
+ i + 1, count);
+
+ return true;
+ }
+ }
+
+ syslog(LOG_NOTICE, "Can't assign any IP address -> address space is full");
+
+ return false;
+}
+
+
+static struct dhcp_assignment*
+dhcpv4_lease(struct interface *iface, enum dhcpv4_msg msg, const uint8_t *mac,
+ const uint32_t reqaddr, uint32_t *leasetime, const char *hostname,
+ const size_t hostname_len, const bool accept_fr_nonce, bool *incl_fr_opt,
+ uint32_t *fr_serverid, const uint8_t *reqopts, const size_t reqopts_len)
+{
+ struct dhcp_assignment *a = find_assignment_by_hwaddr(iface, mac);
+ struct lease *l = config_find_lease_by_mac(mac);
+ time_t now = odhcpd_time();
+
+ /*
+ * If we found a static lease cfg, but no old assignment for this
+ * hwaddr, we need to clear out any old assignments given to other
+ * hwaddrs in order to take over the IP address.
+ */
+ if (l && !a && (msg == DHCPV4_MSG_DISCOVER || msg == DHCPV4_MSG_REQUEST)) {
+ struct dhcp_assignment *c, *tmp;
+
+ list_for_each_entry_safe(c, tmp, &l->assignments, lease_list) {
+ if (c->flags & OAF_DHCPV4 && c->flags & OAF_STATIC)
+ free_assignment(c);
+ }
+ }
+
+ if (l && a && a->lease != l) {
+ free_assignment(a);
+ a = NULL;
+ }
+
+ if (a && (a->flags & OAF_BOUND) && a->fr_ip) {
+ *fr_serverid = a->fr_ip->addr.addr.in.s_addr;
+ dhcpv4_fr_stop(a);
+ }
+
+ if (msg == DHCPV4_MSG_DISCOVER || msg == DHCPV4_MSG_REQUEST) {
+ bool assigned = !!a;
+
+ if (!a) {
+ if (!iface->no_dynamic_dhcp || l) {
+ /* Create new binding */
+ a = alloc_assignment(0);
+ if (!a) {
+ syslog(LOG_WARNING, "Failed to alloc assignment on interface %s",
+ iface->ifname);
+ return NULL;
+ }
+ memcpy(a->hwaddr, mac, sizeof(a->hwaddr));
+ /* Set valid time to 0 for static lease indicating */
+ /* infinite lifetime otherwise current time */
+ a->valid_until = l ? 0 : now;
+ a->dhcp_free_cb = dhcpv4_free_assignment;
+ a->iface = iface;
+ a->flags = OAF_DHCPV4;
+ a->addr = l ? l->ipaddr : INADDR_ANY;
+
+ assigned = dhcpv4_assign(iface, a, reqaddr);
+
+ if (l) {
+ a->flags |= OAF_STATIC;
+
+ if (l->hostname)
+ a->hostname = strdup(l->hostname);
+
+ if (l->leasetime)
+ a->leasetime = l->leasetime;
+
+ list_add(&a->lease_list, &l->assignments);
+ a->lease = l;
+ }
+ }
+ } else if (((a->addr & iface->dhcpv4_mask.s_addr) !=
+ (iface->dhcpv4_start_ip.s_addr & iface->dhcpv4_mask.s_addr)) &&
+ !(a->flags & OAF_STATIC)) {
+ list_del_init(&a->head);
+ a->addr = INADDR_ANY;
+
+ assigned = dhcpv4_assign(iface, a, reqaddr);
+ }
+
+ if (assigned) {
+ uint32_t my_leasetime;
+
+ if (a->leasetime)
+ my_leasetime = a->leasetime;
+ else
+ my_leasetime = iface->dhcp_leasetime;
+
+ if ((*leasetime == 0) || (my_leasetime < *leasetime))
+ *leasetime = my_leasetime;
+
+ if (msg == DHCPV4_MSG_DISCOVER) {
+ a->flags &= ~OAF_BOUND;
+
+ *incl_fr_opt = accept_fr_nonce;
+ a->valid_until = now;
+ } else {
+ if ((!(a->flags & OAF_STATIC) || !a->hostname) && hostname_len > 0) {
+ a->hostname = realloc(a->hostname, hostname_len + 1);
+ if (a->hostname) {
+ memcpy(a->hostname, hostname, hostname_len);
+ a->hostname[hostname_len] = 0;
+
+ if (odhcpd_valid_hostname(a->hostname))
+ a->flags &= ~OAF_BROKEN_HOSTNAME;
+ else
+ a->flags |= OAF_BROKEN_HOSTNAME;
+ }
+ }
+
+ if (reqopts_len > 0) {
+ a->reqopts = realloc(a->reqopts, reqopts_len);
+ if (a->reqopts) {
+ memcpy(a->reqopts, reqopts, reqopts_len);
+ a->reqopts_len = reqopts_len;
+ }
+ }
+
+ if (!(a->flags & OAF_BOUND)) {
+ a->accept_fr_nonce = accept_fr_nonce;
+ *incl_fr_opt = accept_fr_nonce;
+ odhcpd_urandom(a->key, sizeof(a->key));
+ a->flags |= OAF_BOUND;
+ } else
+ *incl_fr_opt = false;
+
+ a->valid_until = ((*leasetime == UINT32_MAX) ? 0 : (time_t)(now + *leasetime));
+ }
+ } else if (!assigned && a) {
+ /* Cleanup failed assignment */
+ free_assignment(a);
+ a = NULL;
+ }
+
+ } else if (msg == DHCPV4_MSG_RELEASE && a) {
+ a->flags &= ~OAF_BOUND;
+ a->valid_until = now - 1;
+
+ } else if (msg == DHCPV4_MSG_DECLINE && a) {
+ a->flags &= ~OAF_BOUND;
+
+ if (!(a->flags & OAF_STATIC) || a->lease->ipaddr != a->addr) {
+ memset(a->hwaddr, 0, sizeof(a->hwaddr));
+ a->valid_until = now + 3600; /* Block address for 1h */
+ } else
+ a->valid_until = now - 1;
+ }
+
+ dhcpv6_ia_write_statefile();
+
+ return a;
+}
+
static int dhcpv4_send_reply(const void *buf, size_t len,
const struct sockaddr *dest, socklen_t dest_len,
void *opaque)
dhcpv4_handle_msg(addr, data, len, iface, dest_addr, dhcpv4_send_reply, &sock);
}
-static void dhcpv4_free_assignment(struct dhcp_assignment *a)
-{
- if (a->fr_ip)
- dhcpv4_fr_stop(a);
-}
-
-static bool dhcpv4_insert_assignment(struct list_head *list, struct dhcp_assignment *a,
- uint32_t addr)
-{
- uint32_t h_addr = ntohl(addr);
- struct dhcp_assignment *c;
-
- list_for_each_entry(c, list, head) {
- uint32_t c_addr = ntohl(c->addr);
-
- if (c_addr == h_addr)
- return false;
-
- if (c_addr > h_addr)
- break;
- }
-
- /* Insert new node before c (might match list head) */
- a->addr = addr;
- list_add_tail(&a->head, &c->head);
-
- return true;
-}
-
-static bool dhcpv4_assign(struct interface *iface, struct dhcp_assignment *a,
- uint32_t raddr)
-{
- uint32_t start = ntohl(iface->dhcpv4_start_ip.s_addr);
- uint32_t end = ntohl(iface->dhcpv4_end_ip.s_addr);
- uint32_t count = end - start + 1;
- uint32_t seed = 0;
- bool assigned;
- char buf[INET_ADDRSTRLEN];
-
- /* Preconfigured IP address by static lease */
- if (a->addr) {
- assigned = dhcpv4_insert_assignment(&iface->dhcpv4_assignments,
- a, a->addr);
-
- if (assigned)
- syslog(LOG_DEBUG, "Assigning static IP: %s",
- inet_ntop(AF_INET, &a->addr, buf, sizeof(buf)));
-
- return assigned;
- }
-
- /* try to assign the IP the client asked for */
- if (start <= ntohl(raddr) && ntohl(raddr) <= end &&
- !config_find_lease_by_ipaddr(raddr)) {
- assigned = dhcpv4_insert_assignment(&iface->dhcpv4_assignments,
- a, raddr);
-
- if (assigned) {
- syslog(LOG_DEBUG, "Assigning the IP the client asked for: %s",
- inet_ntop(AF_INET, &a->addr, buf, sizeof(buf)));
- return true;
- }
- }
-
- /* Seed RNG with checksum of hwaddress */
- for (size_t i = 0; i < sizeof(a->hwaddr); ++i) {
- /* Knuth's multiplicative method */
- uint8_t o = a->hwaddr[i];
- seed += (o*2654435761) % UINT32_MAX;
- }
-
- srand(seed);
-
- for (uint32_t i = 0, try = (((uint32_t)rand()) % count) + start; i < count;
- ++i, try = (((try - start) + 1) % count) + start) {
- uint32_t n_try = htonl(try);
-
- if (config_find_lease_by_ipaddr(n_try))
- continue;
-
- assigned = dhcpv4_insert_assignment(&iface->dhcpv4_assignments,
- a, n_try);
-
- if (assigned) {
- syslog(LOG_DEBUG, "Assigning mapped IP: %s (try %u of %u)",
- inet_ntop(AF_INET, &a->addr, buf, sizeof(buf)),
- i + 1, count);
-
- return true;
- }
- }
-
- syslog(LOG_NOTICE, "Can't assign any IP address -> address space is full");
-
- return false;
-}
-
-
-static struct dhcp_assignment*
-dhcpv4_lease(struct interface *iface, enum dhcpv4_msg msg, const uint8_t *mac,
- const uint32_t reqaddr, uint32_t *leasetime, const char *hostname,
- const size_t hostname_len, const bool accept_fr_nonce, bool *incl_fr_opt,
- uint32_t *fr_serverid, const uint8_t *reqopts, const size_t reqopts_len)
-{
- struct dhcp_assignment *a = find_assignment_by_hwaddr(iface, mac);
- struct lease *l = config_find_lease_by_mac(mac);
- time_t now = odhcpd_time();
-
- /*
- * If we found a static lease cfg, but no old assignment for this
- * hwaddr, we need to clear out any old assignments given to other
- * hwaddrs in order to take over the IP address.
- */
- if (l && !a && (msg == DHCPV4_MSG_DISCOVER || msg == DHCPV4_MSG_REQUEST)) {
- struct dhcp_assignment *c, *tmp;
-
- list_for_each_entry_safe(c, tmp, &l->assignments, lease_list) {
- if (c->flags & OAF_DHCPV4 && c->flags & OAF_STATIC)
- free_assignment(c);
- }
- }
-
- if (l && a && a->lease != l) {
- free_assignment(a);
- a = NULL;
- }
-
- if (a && (a->flags & OAF_BOUND) && a->fr_ip) {
- *fr_serverid = a->fr_ip->addr.addr.in.s_addr;
- dhcpv4_fr_stop(a);
- }
-
- if (msg == DHCPV4_MSG_DISCOVER || msg == DHCPV4_MSG_REQUEST) {
- bool assigned = !!a;
-
- if (!a) {
- if (!iface->no_dynamic_dhcp || l) {
- /* Create new binding */
- a = alloc_assignment(0);
- if (!a) {
- syslog(LOG_WARNING, "Failed to alloc assignment on interface %s",
- iface->ifname);
- return NULL;
- }
- memcpy(a->hwaddr, mac, sizeof(a->hwaddr));
- /* Set valid time to 0 for static lease indicating */
- /* infinite lifetime otherwise current time */
- a->valid_until = l ? 0 : now;
- a->dhcp_free_cb = dhcpv4_free_assignment;
- a->iface = iface;
- a->flags = OAF_DHCPV4;
- a->addr = l ? l->ipaddr : INADDR_ANY;
-
- assigned = dhcpv4_assign(iface, a, reqaddr);
-
- if (l) {
- a->flags |= OAF_STATIC;
-
- if (l->hostname)
- a->hostname = strdup(l->hostname);
-
- if (l->leasetime)
- a->leasetime = l->leasetime;
-
- list_add(&a->lease_list, &l->assignments);
- a->lease = l;
- }
- }
- } else if (((a->addr & iface->dhcpv4_mask.s_addr) !=
- (iface->dhcpv4_start_ip.s_addr & iface->dhcpv4_mask.s_addr)) &&
- !(a->flags & OAF_STATIC)) {
- list_del_init(&a->head);
- a->addr = INADDR_ANY;
-
- assigned = dhcpv4_assign(iface, a, reqaddr);
- }
-
- if (assigned) {
- uint32_t my_leasetime;
-
- if (a->leasetime)
- my_leasetime = a->leasetime;
- else
- my_leasetime = iface->dhcp_leasetime;
-
- if ((*leasetime == 0) || (my_leasetime < *leasetime))
- *leasetime = my_leasetime;
-
- if (msg == DHCPV4_MSG_DISCOVER) {
- a->flags &= ~OAF_BOUND;
-
- *incl_fr_opt = accept_fr_nonce;
- a->valid_until = now;
- } else {
- if ((!(a->flags & OAF_STATIC) || !a->hostname) && hostname_len > 0) {
- a->hostname = realloc(a->hostname, hostname_len + 1);
- if (a->hostname) {
- memcpy(a->hostname, hostname, hostname_len);
- a->hostname[hostname_len] = 0;
-
- if (odhcpd_valid_hostname(a->hostname))
- a->flags &= ~OAF_BROKEN_HOSTNAME;
- else
- a->flags |= OAF_BROKEN_HOSTNAME;
- }
- }
-
- if (reqopts_len > 0) {
- a->reqopts = realloc(a->reqopts, reqopts_len);
- if (a->reqopts) {
- memcpy(a->reqopts, reqopts, reqopts_len);
- a->reqopts_len = reqopts_len;
- }
- }
-
- if (!(a->flags & OAF_BOUND)) {
- a->accept_fr_nonce = accept_fr_nonce;
- *incl_fr_opt = accept_fr_nonce;
- odhcpd_urandom(a->key, sizeof(a->key));
- a->flags |= OAF_BOUND;
- } else
- *incl_fr_opt = false;
-
- a->valid_until = ((*leasetime == UINT32_MAX) ? 0 : (time_t)(now + *leasetime));
- }
- } else if (!assigned && a) {
- /* Cleanup failed assignment */
- free_assignment(a);
- a = NULL;
- }
-
- } else if (msg == DHCPV4_MSG_RELEASE && a) {
- a->flags &= ~OAF_BOUND;
- a->valid_until = now - 1;
-
- } else if (msg == DHCPV4_MSG_DECLINE && a) {
- a->flags &= ~OAF_BOUND;
-
- if (!(a->flags & OAF_STATIC) || a->lease->ipaddr != a->addr) {
- memset(a->hwaddr, 0, sizeof(a->hwaddr));
- a->valid_until = now + 3600; /* Block address for 1h */
- } else
- a->valid_until = now - 1;
- }
-
- dhcpv6_ia_write_statefile();
-
- return a;
-}
-
static int dhcpv4_setup_addresses(struct interface *iface)
{
iface->dhcpv4_start_ip.s_addr = INADDR_ANY;
projects / project / odhcpd.git / commitdiff