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");
121 const char* saddr
= ubus_get_address4(iface
->name
);
123 inet_pton(AF_INET
,saddr
, &addr
);
124 iface
->dhcpv4_addr
.s_addr
= addr
.s_addr
;
125 int bits
= ubus_get_mask4(iface
->name
);
127 if (bits
< -32 || bits
> 32)
130 mask
.s_addr
= bits
? htonl(~((1 << (32 - abs(bits
))) - 1)) : 0;
132 mask
.s_addr
= ~mask
.s_addr
;
134 iface
->dhcpv4_mask
.s_addr
= mask
.s_addr
;
136 // Create a range if not specified
137 if (!(iface
->dhcpv4_start
.s_addr
& htonl(0xffff0000)) &&
138 !(iface
->dhcpv4_end
.s_addr
& htonl(0xffff0000))) {
141 uint32_t start
= ntohl(iface
->dhcpv4_start
.s_addr
);
142 uint32_t end
= ntohl(iface
->dhcpv4_end
.s_addr
);
144 if (start
&& end
&& start
< end
&&
145 start
> ntohl(addr
.s_addr
& ~mask
.s_addr
) &&
146 (start
& ntohl(~mask
.s_addr
)) == start
&&
147 (end
& ntohl(~mask
.s_addr
)) == end
) {
148 iface
->dhcpv4_start
.s_addr
= htonl(start
) |
149 (addr
.s_addr
& mask
.s_addr
);
150 iface
->dhcpv4_end
.s_addr
= htonl(end
) |
151 (addr
.s_addr
& mask
.s_addr
);
152 } else if (ntohl(mask
.s_addr
) <= 0xfffffff0) {
153 start
= addr
.s_addr
& mask
.s_addr
;
154 end
= addr
.s_addr
& mask
.s_addr
;
156 if (ntohl(mask
.s_addr
) <= 0xffffff00) {
157 iface
->dhcpv4_start
.s_addr
= start
| htonl(100);
158 iface
->dhcpv4_end
.s_addr
= end
| htonl(250);
159 } else if (ntohl(mask
.s_addr
) <= 0xffffffc0) {
160 iface
->dhcpv4_start
.s_addr
= start
| htonl(10);
161 iface
->dhcpv4_end
.s_addr
= end
| htonl(60);
162 } else if (ntohl(mask
.s_addr
) <= 0xffffffe0) {
163 iface
->dhcpv4_start
.s_addr
= start
| htonl(10);
164 iface
->dhcpv4_end
.s_addr
= end
| htonl(30);
166 iface
->dhcpv4_start
.s_addr
= start
| htonl(3);
167 iface
->dhcpv4_end
.s_addr
= end
| htonl(12);
173 syslog(LOG_WARNING
, "DHCPv4 dhcp addr %s", inet_ntoa(iface
->dhcpv4_addr
));
174 syslog(LOG_WARNING
, "DHCPv4 dhcp mask %s", inet_ntoa(iface
->dhcpv4_mask
));
175 syslog(LOG_WARNING
, "DHCPv4 dhcp start %s", inet_ntoa(iface
->dhcpv4_start
));
176 syslog(LOG_WARNING
, "DHCPv4 dhcp end %s", inet_ntoa(iface
->dhcpv4_end
));
179 // Parse static entries
181 list_for_each_entry(lease
, &leases
, head
) {
183 size_t hostlen
= strlen(lease
->hostname
) + 1;
184 struct dhcpv4_assignment
*a
= calloc(1, sizeof(*a
) + hostlen
);
186 syslog(LOG_ERR
, "Calloc failed for static lease on interface %s",
190 a
->addr
= ntohl(lease
->ipaddr
.s_addr
);
191 memcpy(a
->hwaddr
, lease
->mac
.ether_addr_octet
, sizeof(a
->hwaddr
));
192 memcpy(a
->hostname
, lease
->hostname
, hostlen
);
193 a
->valid_until
= LONG_MAX
;
195 // Assign to all interfaces
196 struct dhcpv4_assignment
*c
;
197 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
198 if (c
->addr
> a
->addr
) {
199 list_add_tail(&a
->head
, &c
->head
);
201 } else if (c
->addr
== a
->addr
) {
202 // Already an assignment with that number
206 if (&c
->head
== &iface
->dhcpv4_assignments
) {
207 list_add(&a
->head
, &iface
->dhcpv4_assignments
);
214 // Clean invalid assignments
215 struct dhcpv4_assignment
*a
, *n
;
216 list_for_each_entry_safe(a
, n
, &iface
->dhcpv4_assignments
, head
) {
217 if ((htonl(a
->addr
) & mask
.s_addr
) !=
218 (iface
->dhcpv4_start
.s_addr
& mask
.s_addr
)) {
225 if (iface
->dhcpv4_leasetime
< 60)
226 iface
->dhcpv4_leasetime
= 43200;
228 iface
->dhcpv4_event
.uloop
.fd
= sock
;
229 iface
->dhcpv4_event
.handle_dgram
= handle_dhcpv4
;
230 odhcpd_register(&iface
->dhcpv4_event
);
231 } else if (iface
->dhcpv4_assignments
.next
) {
232 while (!list_empty(&iface
->dhcpv4_assignments
)) {
233 struct dhcpv4_assignment
*a
= list_first_entry(&iface
->dhcpv4_assignments
,
234 struct dhcpv4_assignment
, head
);
244 static void dhcpv4_put(struct dhcpv4_message
*msg
, uint8_t **cookie
,
245 uint8_t type
, uint8_t len
, const void *data
)
247 uint8_t *c
= *cookie
;
248 if (*cookie
+ 2 + len
> (uint8_t*)&msg
[1])
253 memcpy(c
, data
, len
);
259 // Simple DHCPv6-server for information requests
260 static void handle_dhcpv4(void *addr
, void *data
, size_t len
,
261 struct interface
*iface
, _unused
void *dest_addr
)
266 struct dhcpv4_message
*req
= data
;
267 if (len
< offsetof(struct dhcpv4_message
, options
) + 4 ||
268 req
->op
!= DHCPV4_BOOTREQUEST
|| req
->hlen
!= 6)
271 int sock
= iface
->dhcpv4_event
.uloop
.fd
;
273 syslog(LOG_WARNING
, "Got DHCPv4 request");
276 memcpy(ifreq
.ifr_name
, iface
->ifname
, sizeof(ifreq
.ifr_name
));
277 if (ioctl(sock
, SIOCGIFADDR
, &ifreq
)) {
278 syslog(LOG_WARNING
, "DHCPv4 failed to detect address: %s", strerror(errno
));
282 uint32_t network
= iface
->dhcpv4_addr
.s_addr
& iface
->dhcpv4_mask
.s_addr
;
284 if ((iface
->dhcpv4_start
.s_addr
& iface
->dhcpv4_mask
.s_addr
) != network
||
285 (iface
->dhcpv4_end
.s_addr
& iface
->dhcpv4_mask
.s_addr
) != network
) {
286 syslog(LOG_WARNING
, "DHCPv4 range out of assigned network");
290 struct ifreq ifr
= {.ifr_name
= ""};
291 strncpy(ifr
.ifr_name
, iface
->ifname
, sizeof(ifr
.ifr_name
));
293 struct dhcpv4_message reply
= {
294 .op
= DHCPV4_BOOTREPLY
,
301 .ciaddr
= {INADDR_ANY
},
302 .giaddr
= req
->giaddr
,
303 .siaddr
= iface
->dhcpv4_addr
,
305 memcpy(reply
.chaddr
, req
->chaddr
, sizeof(reply
.chaddr
));
307 reply
.options
[0] = 0x63;
308 reply
.options
[1] = 0x82;
309 reply
.options
[2] = 0x53;
310 reply
.options
[3] = 0x63;
312 uint8_t *cookie
= &reply
.options
[4];
313 uint8_t reqmsg
= DHCPV4_MSG_REQUEST
;
314 uint8_t msg
= DHCPV4_MSG_ACK
;
316 struct in_addr reqaddr
= {INADDR_ANY
};
320 uint8_t *start
= &req
->options
[4];
321 uint8_t *end
= ((uint8_t*)data
) + len
;
322 struct dhcpv4_option
*opt
;
323 dhcpv4_for_each_option(start
, end
, opt
) {
324 if (opt
->type
== DHCPV4_OPT_MESSAGE
&& opt
->len
== 1) {
325 reqmsg
= opt
->data
[0];
326 } else if (opt
->type
== DHCPV4_OPT_HOSTNAME
&& opt
->len
> 0) {
327 memcpy(hostname
, opt
->data
, opt
->len
);
328 hostname
[opt
->len
] = 0;
329 } else if (opt
->type
== DHCPV4_OPT_IPADDRESS
&& opt
->len
== 4) {
330 memcpy(&reqaddr
, opt
->data
, 4);
331 } else if (opt
->type
== DHCPV4_OPT_SERVERID
&& opt
->len
== 4) {
332 if (memcmp(opt
->data
, &iface
->dhcpv4_addr
, 4))
334 } else if (iface
->filter_class
&& opt
->type
== DHCPV4_OPT_USER_CLASS
) {
335 uint8_t *c
= opt
->data
, *cend
= &opt
->data
[opt
->len
];
336 for (; c
< cend
&& &c
[*c
] < cend
; c
= &c
[1 + *c
]) {
337 size_t elen
= strlen(iface
->filter_class
);
338 if (*c
== elen
&& !memcmp(&c
[1], iface
->filter_class
, elen
))
339 return; // Ignore from homenet
344 if (reqmsg
!= DHCPV4_MSG_DISCOVER
&& reqmsg
!= DHCPV4_MSG_REQUEST
&&
345 reqmsg
!= DHCPV4_MSG_INFORM
&& reqmsg
!= DHCPV4_MSG_DECLINE
&&
346 reqmsg
!= DHCPV4_MSG_RELEASE
)
349 struct dhcpv4_assignment
*lease
= NULL
;
350 if (reqmsg
!= DHCPV4_MSG_INFORM
)
351 lease
= dhcpv4_lease(iface
, reqmsg
, req
->chaddr
, reqaddr
, hostname
);
354 if (reqmsg
== DHCPV4_MSG_REQUEST
)
355 msg
= DHCPV4_MSG_NAK
;
356 else if (reqmsg
== DHCPV4_MSG_DISCOVER
)
358 } else if (reqmsg
== DHCPV4_MSG_DISCOVER
) {
359 msg
= DHCPV4_MSG_OFFER
;
360 } else if (reqmsg
== DHCPV4_MSG_REQUEST
&& reqaddr
.s_addr
&&
361 reqaddr
.s_addr
!= htonl(lease
->addr
)) {
362 msg
= DHCPV4_MSG_NAK
;
364 * DHCP client requested an IP which we can't offer to him. Probably the
365 * client changed the network. The reply type is set to DHCPV4_MSG_NAK,
366 * because the client should not use that IP.
368 * For modern devices we build an answer that includes a valid IP, like
369 * a DHCPV4_MSG_ACK. The client will use that IP and doesn't need to
370 * perform additional DHCP round trips.
375 syslog(LOG_WARNING
, "received %s from %x:%x:%x:%x:%x:%x",
376 dhcpv4_msg_to_string(reqmsg
),
377 req
->chaddr
[0],req
->chaddr
[1],req
->chaddr
[2],
378 req
->chaddr
[3],req
->chaddr
[4],req
->chaddr
[5]);
380 if (reqmsg
== DHCPV4_MSG_DECLINE
|| reqmsg
== DHCPV4_MSG_RELEASE
)
383 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_MESSAGE
, 1, &msg
);
384 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SERVERID
, 4, &iface
->dhcpv4_addr
);
387 reply
.yiaddr
.s_addr
= htonl(lease
->addr
);
389 uint32_t val
= htonl(iface
->dhcpv4_leasetime
);
390 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_LEASETIME
, 4, &val
);
392 val
= htonl(500 * iface
->dhcpv4_leasetime
/ 1000);
393 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_RENEW
, 4, &val
);
395 val
= htonl(875 * iface
->dhcpv4_leasetime
/ 1000);
396 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_REBIND
, 4, &val
);
398 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_NETMASK
, 4, &iface
->dhcpv4_mask
);
400 if (lease
->hostname
[0])
401 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_HOSTNAME
,
402 strlen(lease
->hostname
), lease
->hostname
);
404 if (!ioctl(sock
, SIOCGIFBRDADDR
, &ifr
)) {
405 struct sockaddr_in
*ina
= (struct sockaddr_in
*)&ifr
.ifr_broadaddr
;
406 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_BROADCAST
, 4, &ina
->sin_addr
);
410 if (!ioctl(sock
, SIOCGIFMTU
, &ifr
)) {
411 uint16_t mtu
= htons(ifr
.ifr_mtu
);
412 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_MTU
, 2, &mtu
);
415 if (iface
->search
&& iface
->search_len
<= 255) {
416 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SEARCH_DOMAIN
,
417 iface
->search_len
, iface
->search
);
418 } else if (!res_init() && _res
.dnsrch
[0] && _res
.dnsrch
[0][0]) {
419 uint8_t search_buf
[256];
420 int len
= dn_comp(_res
.dnsrch
[0], search_buf
,
421 sizeof(search_buf
), NULL
, NULL
);
423 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_SEARCH_DOMAIN
,
427 if (iface
->dhcpv4_router_cnt
== 0)
428 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_ROUTER
, 4, &iface
->dhcpv4_addr
);
430 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_ROUTER
,
431 4 * iface
->dhcpv4_router_cnt
, iface
->dhcpv4_router
);
434 if (iface
->dhcpv4_dns_cnt
== 0)
435 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_DNSSERVER
, 4, &iface
->dhcpv4_addr
);
437 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_DNSSERVER
,
438 4 * iface
->dhcpv4_dns_cnt
, iface
->dhcpv4_dns
);
441 dhcpv4_put(&reply
, &cookie
, DHCPV4_OPT_END
, 0, NULL
);
443 struct sockaddr_in dest
= *((struct sockaddr_in
*)addr
);
444 if (req
->giaddr
.s_addr
) {
446 * relay agent is configured, send reply to the agent
448 dest
.sin_addr
= req
->giaddr
;
449 dest
.sin_port
= htons(DHCPV4_SERVER_PORT
);
450 } else if (req
->ciaddr
.s_addr
&& req
->ciaddr
.s_addr
!= dest
.sin_addr
.s_addr
) {
452 * client has existing configuration (ciaddr is set) AND this address is
453 * not the address it used for the dhcp message
455 dest
.sin_addr
= req
->ciaddr
;
456 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
457 } else if ((ntohs(req
->flags
) & DHCPV4_FLAG_BROADCAST
) ||
458 req
->hlen
!= reply
.hlen
|| !reply
.yiaddr
.s_addr
) {
460 * client requests a broadcast reply OR we can't offer an IP
462 dest
.sin_addr
.s_addr
= INADDR_BROADCAST
;
463 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
464 } else if (!req
->ciaddr
.s_addr
&& msg
== DHCPV4_MSG_NAK
) {
466 * client has no previous configuration -> no IP, so we need to reply
467 * with a broadcast packet
469 dest
.sin_addr
.s_addr
= INADDR_BROADCAST
;
470 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
473 * send reply to the newly (in this proccess) allocated IP
475 dest
.sin_addr
= reply
.yiaddr
;
476 dest
.sin_port
= htons(DHCPV4_CLIENT_PORT
);
478 struct arpreq arp
= {.arp_flags
= ATF_COM
};
479 memcpy(arp
.arp_ha
.sa_data
, req
->chaddr
, 6);
480 memcpy(&arp
.arp_pa
, &dest
, sizeof(arp
.arp_pa
));
481 memcpy(arp
.arp_dev
, iface
->ifname
, sizeof(arp
.arp_dev
));
482 ioctl(sock
, SIOCSARP
, &arp
);
485 if (dest
.sin_addr
.s_addr
== INADDR_BROADCAST
) {
487 * reply goes to IP broadcast -> MAC broadcast
489 syslog(LOG_WARNING
, "sending %s to ff:ff:ff:ff:ff:ff - %s",
490 dhcpv4_msg_to_string(msg
),
491 inet_ntoa(dest
.sin_addr
));
494 * reply is send directly to IP,
495 * MAC is assumed to be the same as the request
497 syslog(LOG_WARNING
, "sending %s to %x:%x:%x:%x:%x:%x - %s",
498 dhcpv4_msg_to_string(msg
),
499 req
->chaddr
[0],req
->chaddr
[1],req
->chaddr
[2],
500 req
->chaddr
[3],req
->chaddr
[4],req
->chaddr
[5],
501 inet_ntoa(dest
.sin_addr
));
504 sendto(sock
, &reply
, sizeof(reply
), MSG_DONTWAIT
,
505 (struct sockaddr
*)&dest
, sizeof(dest
));
508 static bool dhcpv4_test(struct interface
*iface
, uint32_t try)
510 struct dhcpv4_assignment
*c
;
511 list_for_each_entry(c
, &iface
->dhcpv4_assignments
, head
) {
512 if (c
->addr
== try) {
519 static bool dhcpv4_assign(struct interface
*iface
,
520 struct dhcpv4_assignment
*assign
, uint32_t raddr
)
522 uint32_t start
= ntohl(iface
->dhcpv4_start
.s_addr
);
523 uint32_t end
= ntohl(iface
->dhcpv4_end
.s_addr
);
524 uint32_t count
= end
- start
+ 1;
526 // try to assign the IP the client asked for
527 if (start
<= raddr
&& raddr
<= end
&& dhcpv4_test(iface
, raddr
)) {
528 assign
->addr
= raddr
;
529 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
530 syslog(LOG_DEBUG
, "assigning the IP the client asked for: %u.%u.%u.%u",
531 (assign
->addr
& 0xff000000) >> 24,
532 (assign
->addr
& 0x00ff0000) >> 16,
533 (assign
->addr
& 0x0000ff00) >> 8,
534 (assign
->addr
& 0x000000ff));
538 // Seed RNG with checksum of hwaddress
540 for (size_t i
= 0; i
< sizeof(assign
->hwaddr
); ++i
) {
541 // Knuth's multiplicative method
542 uint8_t o
= assign
->hwaddr
[i
];
543 seed
+= (o
*2654435761) % UINT32_MAX
;
547 uint32_t try = (((uint32_t)rand()) % count
) + start
;
549 if (list_empty(&iface
->dhcpv4_assignments
)) {
551 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
552 syslog(LOG_DEBUG
, "assigning mapped IP (empty list): %u.%u.%u.%u",
553 (assign
->addr
& 0xff000000) >> 24,
554 (assign
->addr
& 0x00ff0000) >> 16,
555 (assign
->addr
& 0x0000ff00) >> 8,
556 (assign
->addr
& 0x000000ff));
560 for (uint32_t i
= 0; i
< count
; ++i
) {
561 if (dhcpv4_test(iface
, try)) {
562 /* test was successful: IP address is not assigned, assign it */
564 list_add(&assign
->head
, &iface
->dhcpv4_assignments
);
565 syslog(LOG_DEBUG
, "assigning mapped IP: %u.%u.%u.%u (try %u of %u)",
566 (assign
->addr
& 0xff000000) >> 24,
567 (assign
->addr
& 0x00ff0000) >> 16,
568 (assign
->addr
& 0x0000ff00) >> 8,
569 (assign
->addr
& 0x000000ff), i
, count
);
572 try = (((try - start
) + 1) % count
) + start
;
575 syslog(LOG_DEBUG
, "can't assign any IP address -> address space is full");
580 static struct dhcpv4_assignment
* dhcpv4_lease(struct interface
*iface
,
581 enum dhcpv4_msg msg
, const uint8_t *mac
, struct in_addr reqaddr
,
582 const char *hostname
)
584 struct dhcpv4_assignment
*lease
= NULL
;
585 uint32_t raddr
= ntohl(reqaddr
.s_addr
);
586 time_t now
= odhcpd_time();
588 struct dhcpv4_assignment
*c
, *n
, *a
= NULL
;
589 list_for_each_entry_safe(c
, n
, &iface
->dhcpv4_assignments
, head
) {
590 if (!memcmp(c
->hwaddr
, mac
, 6)) {
592 if (c
->addr
== raddr
)
594 } else if (c
->valid_until
< now
) {
600 if (msg
== DHCPV4_MSG_DISCOVER
|| msg
== DHCPV4_MSG_REQUEST
) {
602 size_t hostlen
= strlen(hostname
) + 1;
604 if (!a
&& !iface
->no_dynamic_dhcp
) { // Create new binding
605 a
= calloc(1, sizeof(*a
) + hostlen
);
607 syslog(LOG_ERR
, "Failed to calloc binding on interface %s", iface
->ifname
);
610 memcpy(a
->hwaddr
, mac
, sizeof(a
->hwaddr
));
611 memcpy(a
->hostname
, hostname
, hostlen
);
613 assigned
= dhcpv4_assign(iface
, a
, raddr
);
616 if (assigned
&& !a
->hostname
[0] && hostname
) {
617 a
= realloc(a
, sizeof(*a
) + hostlen
);
619 syslog(LOG_ERR
, "Failed to realloc binding on interface %s", iface
->ifname
);
622 memcpy(a
->hostname
, hostname
, hostlen
);
625 a
->head
.next
->prev
= &a
->head
;
626 a
->head
.prev
->next
= &a
->head
;
629 // Was only a solicitation: mark binding for removal
630 if (assigned
&& a
->valid_until
< now
) {
631 a
->valid_until
= (msg
== DHCPV4_MSG_DISCOVER
) ? 0 :
632 (now
+ iface
->dhcpv4_leasetime
);
633 } else if (!assigned
&& a
) { // Cleanup failed assignment
640 } else if (msg
== DHCPV4_MSG_RELEASE
) {
641 if (a
&& a
->valid_until
!= LONG_MAX
)
643 } else if (msg
== DHCPV4_MSG_DECLINE
&& a
&& a
->valid_until
!= LONG_MAX
) {
644 memset(a
->hwaddr
, 0, sizeof(a
->hwaddr
));
645 a
->valid_until
= now
+ 3600; // Block address for 1h
648 dhcpv6_write_statefile();