2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
25 #include <net/if_arp.h>
26 #include <netinet/ip.h>
27 #include <sys/ioctl.h>
28 #include <sys/timerfd.h>
29 #include <arpa/inet.h>
36 static void handle_dhcpv4(void *addr, void *data, size_t len,
37 struct interface *iface, void *dest_addr);
38 static struct dhcpv4_assignment* dhcpv4_lease(struct interface *iface,
39 enum dhcpv4_msg msg, const uint8_t *mac, struct in_addr reqaddr,
40 const char *hostname);
42 // Create socket and register events
48 char *dhcpv4_msg_to_string(uint8_t reqmsg)
51 case (DHCPV4_MSG_DISCOVER):
52 return "DHCPV4_MSG_DISCOVER";
53 case (DHCPV4_MSG_OFFER):
54 return "DHCPV4_MSG_OFFER";
55 case (DHCPV4_MSG_REQUEST):
56 return "DHCPV4_MSG_REQUEST";
57 case (DHCPV4_MSG_DECLINE):
58 return "DHCPV4_MSG_DECLINE";
59 case (DHCPV4_MSG_ACK):
60 return "DHCPV4_MSG_ACK";
61 case (DHCPV4_MSG_NAK):
62 return "DHCPV4_MSG_NAK";
63 case (DHCPV4_MSG_RELEASE):
64 return "DHCPV4_MSG_RELEASE";
65 case (DHCPV4_MSG_INFORM):
66 return "DHCPV4_MSG_INFORM";
72 int setup_dhcpv4_interface(struct interface *iface, bool enable)
74 if (iface->dhcpv4_event.uloop.fd > 0) {
75 uloop_fd_delete(&iface->dhcpv4_event.uloop);
76 close(iface->dhcpv4_event.uloop.fd);
77 iface->dhcpv4_event.uloop.fd = -1;
80 if (iface->dhcpv4 && enable) {
81 if (!iface->dhcpv4_assignments.next)
82 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
84 int sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
86 syslog(LOG_ERR, "Failed to create DHCPv4 server socket: %s",
91 // Basic IPv6 configuration
93 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
94 setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &val, sizeof(val));
95 setsockopt(sock, IPPROTO_IP, IP_PKTINFO, &val, sizeof(val));
97 val = IPTOS_PREC_INTERNETCONTROL;
98 setsockopt(sock, IPPROTO_IP, IP_TOS, &val, sizeof(val));
100 val = IP_PMTUDISC_DONT;
101 setsockopt(sock, IPPROTO_IP, IP_MTU_DISCOVER, &val, sizeof(val));
103 setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE,
104 iface->ifname, strlen(iface->ifname));
106 struct sockaddr_in bind_addr = {AF_INET, htons(DHCPV4_SERVER_PORT),
109 if (bind(sock, (struct sockaddr*)&bind_addr, sizeof(bind_addr))) {
110 syslog(LOG_ERR, "Failed to open DHCPv4 server socket: %s",
116 if (ntohl(iface->dhcpv4_start.s_addr) > ntohl(iface->dhcpv4_end.s_addr)) {
117 syslog(LOG_ERR, "Invalid DHCP range");
123 strncpy(ifreq.ifr_name, iface->ifname, sizeof(ifreq.ifr_name));
125 struct sockaddr_in *saddr = (struct sockaddr_in*)&ifreq.ifr_addr;
126 struct sockaddr_in *smask = (struct sockaddr_in*)&ifreq.ifr_netmask;
128 if (!ioctl(sock, SIOCGIFADDR, &ifreq)) {
129 struct in_addr addr = saddr->sin_addr;
130 iface->dhcpv4_addr.s_addr = addr.s_addr;
131 ioctl(sock, SIOCGIFNETMASK, &ifreq);
132 struct in_addr mask = smask->sin_addr;
133 iface->dhcpv4_mask.s_addr = mask.s_addr;
136 const char* saddr = ubus_get_address4(iface->name);
138 inet_pton(AF_INET,saddr, &addr);
139 iface->dhcpv4_addr.s_addr = addr.s_addr;
140 int bits = ubus_get_mask4(iface->name);
142 if (bits < -32 || bits > 32)
145 mask.s_addr = bits ? htonl(~((1 << (32 - abs(bits))) - 1)) : 0;
147 mask.s_addr = ~mask.s_addr;
149 iface->dhcpv4_mask.s_addr = mask.s_addr;
152 // Create a range if not specified
153 if (!(iface->dhcpv4_start.s_addr & htonl(0xffff0000)) &&
154 !(iface->dhcpv4_end.s_addr & htonl(0xffff0000)) &&
155 iface->dhcpv4_addr.s_addr) {
157 uint32_t start = ntohl(iface->dhcpv4_start.s_addr);
158 uint32_t end = ntohl(iface->dhcpv4_end.s_addr);
160 if (start && end && start < end &&
161 start > ntohl(addr.s_addr & ~mask.s_addr) &&
162 (start & ntohl(~mask.s_addr)) == start &&
163 (end & ntohl(~mask.s_addr)) == end) {
164 iface->dhcpv4_start.s_addr = htonl(start) |
165 (addr.s_addr & mask.s_addr);
166 iface->dhcpv4_end.s_addr = htonl(end) |
167 (addr.s_addr & mask.s_addr);
168 } else if (ntohl(mask.s_addr) <= 0xfffffff0) {
169 start = addr.s_addr & mask.s_addr;
170 end = addr.s_addr & mask.s_addr;
172 if (ntohl(mask.s_addr) <= 0xffffff00) {
173 iface->dhcpv4_start.s_addr = start | htonl(100);
174 iface->dhcpv4_end.s_addr = end | htonl(250);
175 } else if (ntohl(mask.s_addr) <= 0xffffffc0) {
176 iface->dhcpv4_start.s_addr = start | htonl(10);
177 iface->dhcpv4_end.s_addr = end | htonl(60);
178 } else if (ntohl(mask.s_addr) <= 0xffffffe0) {
179 iface->dhcpv4_start.s_addr = start | htonl(10);
180 iface->dhcpv4_end.s_addr = end | htonl(30);
182 iface->dhcpv4_start.s_addr = start | htonl(3);
183 iface->dhcpv4_end.s_addr = end | htonl(12);
189 syslog(LOG_WARNING, "DHCPv4 dhcp addr %s", inet_ntoa(iface->dhcpv4_addr));
190 syslog(LOG_WARNING, "DHCPv4 dhcp mask %s", inet_ntoa(iface->dhcpv4_mask));
191 syslog(LOG_WARNING, "DHCPv4 dhcp start %s", inet_ntoa(iface->dhcpv4_start));
192 syslog(LOG_WARNING, "DHCPv4 dhcp end %s", inet_ntoa(iface->dhcpv4_end));
195 // Parse static entries
197 list_for_each_entry(lease, &leases, head) {
199 size_t hostlen = strlen(lease->hostname) + 1;
200 struct dhcpv4_assignment *a = calloc(1, sizeof(*a) + hostlen);
202 syslog(LOG_ERR, "Calloc failed for static lease on interface %s",
206 a->addr = ntohl(lease->ipaddr.s_addr);
207 memcpy(a->hwaddr, lease->mac.ether_addr_octet, sizeof(a->hwaddr));
208 memcpy(a->hostname, lease->hostname, hostlen);
209 a->valid_until = LONG_MAX;
211 // Assign to all interfaces
212 struct dhcpv4_assignment *c;
213 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
214 if (c->addr > a->addr) {
215 list_add_tail(&a->head, &c->head);
217 } else if (c->addr == a->addr) {
218 // Already an assignment with that number
222 if (&c->head == &iface->dhcpv4_assignments) {
223 list_add(&a->head, &iface->dhcpv4_assignments);
230 // Clean invalid assignments
231 struct dhcpv4_assignment *a, *n;
232 list_for_each_entry_safe(a, n, &iface->dhcpv4_assignments, head) {
233 if ((htonl(a->addr) & mask.s_addr) !=
234 (iface->dhcpv4_start.s_addr & mask.s_addr)) {
241 if (iface->dhcpv4_leasetime < 60)
242 iface->dhcpv4_leasetime = 43200;
244 iface->dhcpv4_event.uloop.fd = sock;
245 iface->dhcpv4_event.handle_dgram = handle_dhcpv4;
246 odhcpd_register(&iface->dhcpv4_event);
247 } else if (iface->dhcpv4_assignments.next) {
248 while (!list_empty(&iface->dhcpv4_assignments)) {
249 struct dhcpv4_assignment *a = list_first_entry(&iface->dhcpv4_assignments,
250 struct dhcpv4_assignment, head);
260 static void dhcpv4_put(struct dhcpv4_message *msg, uint8_t **cookie,
261 uint8_t type, uint8_t len, const void *data)
263 uint8_t *c = *cookie;
264 if (*cookie + 2 + len > (uint8_t*)&msg[1])
269 memcpy(c, data, len);
275 // Simple DHCPv6-server for information requests
276 static void handle_dhcpv4(void *addr, void *data, size_t len,
277 struct interface *iface, _unused void *dest_addr)
282 struct dhcpv4_message *req = data;
283 if (len < offsetof(struct dhcpv4_message, options) + 4 ||
284 req->op != DHCPV4_BOOTREQUEST || req->hlen != 6)
287 int sock = iface->dhcpv4_event.uloop.fd;
289 syslog(LOG_NOTICE, "Got DHCPv4 request");
292 memcpy(ifreq.ifr_name, iface->ifname, sizeof(ifreq.ifr_name));
293 if (ioctl(sock, SIOCGIFADDR, &ifreq)) {
294 syslog(LOG_WARNING, "DHCPv4 failed to detect address: %s", strerror(errno));
298 uint32_t network = iface->dhcpv4_addr.s_addr & iface->dhcpv4_mask.s_addr;
300 if ((iface->dhcpv4_start.s_addr & iface->dhcpv4_mask.s_addr) != network ||
301 (iface->dhcpv4_end.s_addr & iface->dhcpv4_mask.s_addr) != network) {
302 syslog(LOG_WARNING, "DHCPv4 range out of assigned network");
306 struct ifreq ifr = {.ifr_name = ""};
307 strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name));
309 struct dhcpv4_message reply = {
310 .op = DHCPV4_BOOTREPLY,
317 .ciaddr = {INADDR_ANY},
318 .giaddr = req->giaddr,
319 .siaddr = iface->dhcpv4_addr,
321 memcpy(reply.chaddr, req->chaddr, sizeof(reply.chaddr));
323 reply.options[0] = 0x63;
324 reply.options[1] = 0x82;
325 reply.options[2] = 0x53;
326 reply.options[3] = 0x63;
328 uint8_t *cookie = &reply.options[4];
329 uint8_t reqmsg = DHCPV4_MSG_REQUEST;
330 uint8_t msg = DHCPV4_MSG_ACK;
332 struct in_addr reqaddr = {INADDR_ANY};
336 uint8_t *start = &req->options[4];
337 uint8_t *end = ((uint8_t*)data) + len;
338 struct dhcpv4_option *opt;
339 dhcpv4_for_each_option(start, end, opt) {
340 if (opt->type == DHCPV4_OPT_MESSAGE && opt->len == 1) {
341 reqmsg = opt->data[0];
342 } else if (opt->type == DHCPV4_OPT_HOSTNAME && opt->len > 0) {
343 memcpy(hostname, opt->data, opt->len);
344 hostname[opt->len] = 0;
345 } else if (opt->type == DHCPV4_OPT_IPADDRESS && opt->len == 4) {
346 memcpy(&reqaddr, opt->data, 4);
347 } else if (opt->type == DHCPV4_OPT_SERVERID && opt->len == 4) {
348 if (memcmp(opt->data, &iface->dhcpv4_addr, 4))
350 } else if (iface->filter_class && opt->type == DHCPV4_OPT_USER_CLASS) {
351 uint8_t *c = opt->data, *cend = &opt->data[opt->len];
352 for (; c < cend && &c[*c] < cend; c = &c[1 + *c]) {
353 size_t elen = strlen(iface->filter_class);
354 if (*c == elen && !memcmp(&c[1], iface->filter_class, elen))
355 return; // Ignore from homenet
360 if (reqmsg != DHCPV4_MSG_DISCOVER && reqmsg != DHCPV4_MSG_REQUEST &&
361 reqmsg != DHCPV4_MSG_INFORM && reqmsg != DHCPV4_MSG_DECLINE &&
362 reqmsg != DHCPV4_MSG_RELEASE)
365 struct dhcpv4_assignment *lease = NULL;
366 if (reqmsg != DHCPV4_MSG_INFORM)
367 lease = dhcpv4_lease(iface, reqmsg, req->chaddr, reqaddr, hostname);
370 if (reqmsg == DHCPV4_MSG_REQUEST)
371 msg = DHCPV4_MSG_NAK;
372 else if (reqmsg == DHCPV4_MSG_DISCOVER)
374 } else if (reqmsg == DHCPV4_MSG_DISCOVER) {
375 msg = DHCPV4_MSG_OFFER;
376 } else if (reqmsg == DHCPV4_MSG_REQUEST && reqaddr.s_addr &&
377 reqaddr.s_addr != htonl(lease->addr)) {
378 msg = DHCPV4_MSG_NAK;
380 * DHCP client requested an IP which we can't offer to him. Probably the
381 * client changed the network. The reply type is set to DHCPV4_MSG_NAK,
382 * because the client should not use that IP.
384 * For modern devices we build an answer that includes a valid IP, like
385 * a DHCPV4_MSG_ACK. The client will use that IP and doesn't need to
386 * perform additional DHCP round trips.
391 syslog(LOG_WARNING, "received %s from %x:%x:%x:%x:%x:%x",
392 dhcpv4_msg_to_string(reqmsg),
393 req->chaddr[0],req->chaddr[1],req->chaddr[2],
394 req->chaddr[3],req->chaddr[4],req->chaddr[5]);
396 if (reqmsg == DHCPV4_MSG_DECLINE || reqmsg == DHCPV4_MSG_RELEASE)
399 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_MESSAGE, 1, &msg);
400 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_SERVERID, 4, &iface->dhcpv4_addr);
403 reply.yiaddr.s_addr = htonl(lease->addr);
405 uint32_t val = htonl(iface->dhcpv4_leasetime);
406 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_LEASETIME, 4, &val);
408 val = htonl(500 * iface->dhcpv4_leasetime / 1000);
409 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_RENEW, 4, &val);
411 val = htonl(875 * iface->dhcpv4_leasetime / 1000);
412 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_REBIND, 4, &val);
414 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_NETMASK, 4, &iface->dhcpv4_mask);
416 if (lease->hostname[0])
417 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_HOSTNAME,
418 strlen(lease->hostname), lease->hostname);
420 if (!ioctl(sock, SIOCGIFBRDADDR, &ifr)) {
421 struct sockaddr_in *ina = (struct sockaddr_in*)&ifr.ifr_broadaddr;
422 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_BROADCAST, 4, &ina->sin_addr);
426 if (!ioctl(sock, SIOCGIFMTU, &ifr)) {
427 uint16_t mtu = htons(ifr.ifr_mtu);
428 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_MTU, 2, &mtu);
431 if (iface->search && iface->search_len <= 255) {
432 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_SEARCH_DOMAIN,
433 iface->search_len, iface->search);
434 } else if (!res_init() && _res.dnsrch[0] && _res.dnsrch[0][0]) {
435 uint8_t search_buf[256];
436 int len = dn_comp(_res.dnsrch[0], search_buf,
437 sizeof(search_buf), NULL, NULL);
439 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_SEARCH_DOMAIN,
443 if (iface->dhcpv4_router_cnt == 0)
444 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_ROUTER, 4, &iface->dhcpv4_addr);
446 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_ROUTER,
447 4 * iface->dhcpv4_router_cnt, iface->dhcpv4_router);
450 if (iface->dhcpv4_dns_cnt == 0)
451 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_DNSSERVER, 4, &iface->dhcpv4_addr);
453 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_DNSSERVER,
454 4 * iface->dhcpv4_dns_cnt, iface->dhcpv4_dns);
457 dhcpv4_put(&reply, &cookie, DHCPV4_OPT_END, 0, NULL);
459 struct sockaddr_in dest = *((struct sockaddr_in*)addr);
460 if (req->giaddr.s_addr) {
462 * relay agent is configured, send reply to the agent
464 dest.sin_addr = req->giaddr;
465 dest.sin_port = htons(DHCPV4_SERVER_PORT);
466 } else if (req->ciaddr.s_addr && req->ciaddr.s_addr != dest.sin_addr.s_addr) {
468 * client has existing configuration (ciaddr is set) AND this address is
469 * not the address it used for the dhcp message
471 dest.sin_addr = req->ciaddr;
472 dest.sin_port = htons(DHCPV4_CLIENT_PORT);
473 } else if ((ntohs(req->flags) & DHCPV4_FLAG_BROADCAST) ||
474 req->hlen != reply.hlen || !reply.yiaddr.s_addr) {
476 * client requests a broadcast reply OR we can't offer an IP
478 dest.sin_addr.s_addr = INADDR_BROADCAST;
479 dest.sin_port = htons(DHCPV4_CLIENT_PORT);
480 } else if (!req->ciaddr.s_addr && msg == DHCPV4_MSG_NAK) {
482 * client has no previous configuration -> no IP, so we need to reply
483 * with a broadcast packet
485 dest.sin_addr.s_addr = INADDR_BROADCAST;
486 dest.sin_port = htons(DHCPV4_CLIENT_PORT);
489 * send reply to the newly (in this proccess) allocated IP
491 dest.sin_addr = reply.yiaddr;
492 dest.sin_port = htons(DHCPV4_CLIENT_PORT);
494 struct arpreq arp = {.arp_flags = ATF_COM};
495 memcpy(arp.arp_ha.sa_data, req->chaddr, 6);
496 memcpy(&arp.arp_pa, &dest, sizeof(arp.arp_pa));
497 memcpy(arp.arp_dev, iface->ifname, sizeof(arp.arp_dev));
498 ioctl(sock, SIOCSARP, &arp);
501 if (dest.sin_addr.s_addr == INADDR_BROADCAST) {
503 * reply goes to IP broadcast -> MAC broadcast
505 syslog(LOG_WARNING, "sending %s to ff:ff:ff:ff:ff:ff - %s",
506 dhcpv4_msg_to_string(msg),
507 inet_ntoa(dest.sin_addr));
510 * reply is send directly to IP,
511 * MAC is assumed to be the same as the request
513 syslog(LOG_WARNING, "sending %s to %x:%x:%x:%x:%x:%x - %s",
514 dhcpv4_msg_to_string(msg),
515 req->chaddr[0],req->chaddr[1],req->chaddr[2],
516 req->chaddr[3],req->chaddr[4],req->chaddr[5],
517 inet_ntoa(dest.sin_addr));
520 sendto(sock, &reply, sizeof(reply), MSG_DONTWAIT,
521 (struct sockaddr*)&dest, sizeof(dest));
524 static bool dhcpv4_test(struct interface *iface, uint32_t try)
526 struct dhcpv4_assignment *c;
527 list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
528 if (c->addr == try) {
535 static bool dhcpv4_assign(struct interface *iface,
536 struct dhcpv4_assignment *assign, uint32_t raddr)
538 uint32_t start = ntohl(iface->dhcpv4_start.s_addr);
539 uint32_t end = ntohl(iface->dhcpv4_end.s_addr);
540 uint32_t count = end - start + 1;
542 // try to assign the IP the client asked for
543 if (start <= raddr && raddr <= end && dhcpv4_test(iface, raddr)) {
544 assign->addr = raddr;
545 list_add(&assign->head, &iface->dhcpv4_assignments);
546 syslog(LOG_DEBUG, "assigning the IP the client asked for: %u.%u.%u.%u",
547 (assign->addr & 0xff000000) >> 24,
548 (assign->addr & 0x00ff0000) >> 16,
549 (assign->addr & 0x0000ff00) >> 8,
550 (assign->addr & 0x000000ff));
554 // Seed RNG with checksum of hwaddress
556 for (size_t i = 0; i < sizeof(assign->hwaddr); ++i) {
557 // Knuth's multiplicative method
558 uint8_t o = assign->hwaddr[i];
559 seed += (o*2654435761) % UINT32_MAX;
563 uint32_t try = (((uint32_t)rand()) % count) + start;
565 if (list_empty(&iface->dhcpv4_assignments)) {
567 list_add(&assign->head, &iface->dhcpv4_assignments);
568 syslog(LOG_DEBUG, "assigning mapped IP (empty list): %u.%u.%u.%u",
569 (assign->addr & 0xff000000) >> 24,
570 (assign->addr & 0x00ff0000) >> 16,
571 (assign->addr & 0x0000ff00) >> 8,
572 (assign->addr & 0x000000ff));
576 for (uint32_t i = 0; i < count; ++i) {
577 if (dhcpv4_test(iface, try)) {
578 /* test was successful: IP address is not assigned, assign it */
580 list_add(&assign->head, &iface->dhcpv4_assignments);
581 syslog(LOG_DEBUG, "assigning mapped IP: %u.%u.%u.%u (try %u of %u)",
582 (assign->addr & 0xff000000) >> 24,
583 (assign->addr & 0x00ff0000) >> 16,
584 (assign->addr & 0x0000ff00) >> 8,
585 (assign->addr & 0x000000ff), i, count);
588 try = (((try - start) + 1) % count) + start;
591 syslog(LOG_DEBUG, "can't assign any IP address -> address space is full");
596 static struct dhcpv4_assignment* dhcpv4_lease(struct interface *iface,
597 enum dhcpv4_msg msg, const uint8_t *mac, struct in_addr reqaddr,
598 const char *hostname)
600 struct dhcpv4_assignment *lease = NULL;
601 uint32_t raddr = ntohl(reqaddr.s_addr);
602 time_t now = odhcpd_time();
604 struct dhcpv4_assignment *c, *n, *a = NULL;
605 list_for_each_entry_safe(c, n, &iface->dhcpv4_assignments, head) {
606 if (!memcmp(c->hwaddr, mac, 6)) {
608 if (c->addr == raddr)
610 } else if (c->valid_until < now) {
616 if (msg == DHCPV4_MSG_DISCOVER || msg == DHCPV4_MSG_REQUEST) {
618 size_t hostlen = strlen(hostname) + 1;
620 if (!a && !iface->no_dynamic_dhcp) { // Create new binding
621 a = calloc(1, sizeof(*a) + hostlen);
623 syslog(LOG_ERR, "Failed to calloc binding on interface %s", iface->ifname);
626 memcpy(a->hwaddr, mac, sizeof(a->hwaddr));
627 memcpy(a->hostname, hostname, hostlen);
629 assigned = dhcpv4_assign(iface, a, raddr);
632 if (assigned && !a->hostname[0] && hostname) {
633 a = realloc(a, sizeof(*a) + hostlen);
635 syslog(LOG_ERR, "Failed to realloc binding on interface %s", iface->ifname);
638 memcpy(a->hostname, hostname, hostlen);
641 a->head.next->prev = &a->head;
642 a->head.prev->next = &a->head;
645 // Was only a solicitation: mark binding for removal
646 if (assigned && a->valid_until < now) {
647 a->valid_until = (msg == DHCPV4_MSG_DISCOVER) ? 0 :
648 (now + iface->dhcpv4_leasetime);
649 } else if (!assigned && a) { // Cleanup failed assignment
656 } else if (msg == DHCPV4_MSG_RELEASE) {
657 if (a && a->valid_until != LONG_MAX)
659 } else if (msg == DHCPV4_MSG_DECLINE && a && a->valid_until != LONG_MAX) {
660 memset(a->hwaddr, 0, sizeof(a->hwaddr));
661 a->valid_until = now + 3600; // Block address for 1h
664 dhcpv6_write_statefile();