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Improved message validation checks and socket error hardening
[project/odhcp6c.git] / src / dhcpv6.c
1 /**
2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
3 *
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.
7 *
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.
12 *
13 */
14
15 #include <time.h>
16 #include <fcntl.h>
17 #include <errno.h>
18 #include <stdlib.h>
19 #include <signal.h>
20 #include <limits.h>
21 #include <resolv.h>
22 #include <string.h>
23 #include <unistd.h>
24 #include <syslog.h>
25 #include <stdbool.h>
26 #include <sys/time.h>
27 #include <sys/ioctl.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
30
31 #include <net/if.h>
32 #include <net/ethernet.h>
33
34 #include "odhcp6c.h"
35 #include "md5.h"
36
37
38 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
39 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
40 #define DHCPV6_CLIENT_PORT 546
41 #define DHCPV6_SERVER_PORT 547
42 #define DHCPV6_DUID_LLADDR 3
43 #define DHCPV6_REQ_DELAY 1
44
45
46 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
47 const uint8_t transaction[3], enum dhcpv6_msg type,
48 const struct in6_addr *daddr);
49
50 static int dhcpv6_parse_ia(void *opt, void *end);
51
52 static int dhcpv6_calc_refresh_timers(void);
53 static void dhcpv6_handle_status_code(_unused const enum dhcpv6_msg orig,
54 const uint16_t code, const void *status_msg, const int len,
55 int *ret);
56 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig,
57 const struct dhcpv6_ia_hdr *ia_hdr, const uint16_t code,
58 const void *status_msg, const int len,
59 bool handled_status_codes[_DHCPV6_Status_Max],
60 int *ret);
61
62 static reply_handler dhcpv6_handle_reply;
63 static reply_handler dhcpv6_handle_advert;
64 static reply_handler dhcpv6_handle_rebind_reply;
65 static reply_handler dhcpv6_handle_reconfigure;
66 static int dhcpv6_commit_advert(void);
67
68
69
70 // RFC 3315 - 5.5 Timeout and Delay values
71 static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
72 [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, 0, "<POLL>",
73 dhcpv6_handle_reconfigure, NULL},
74 [DHCPV6_MSG_SOLICIT] = {true, 1, 3600, 0, "SOLICIT",
75 dhcpv6_handle_advert, dhcpv6_commit_advert},
76 [DHCPV6_MSG_REQUEST] = {true, 1, 30, 10, "REQUEST",
77 dhcpv6_handle_reply, NULL},
78 [DHCPV6_MSG_RENEW] = {false, 10, 600, 0, "RENEW",
79 dhcpv6_handle_reply, NULL},
80 [DHCPV6_MSG_REBIND] = {false, 10, 600, 0, "REBIND",
81 dhcpv6_handle_rebind_reply, NULL},
82 [DHCPV6_MSG_RELEASE] = {false, 1, 0, 5, "RELEASE", NULL, NULL},
83 [DHCPV6_MSG_DECLINE] = {false, 1, 0, 5, "DECLINE", NULL, NULL},
84 [DHCPV6_MSG_INFO_REQ] = {true, 1, 120, 0, "INFOREQ",
85 dhcpv6_handle_reply, NULL},
86 };
87
88
89 // Sockets
90 static int sock = -1;
91 static int ifindex = -1;
92 static int64_t t1 = 0, t2 = 0, t3 = 0;
93
94 // IA states
95 static int request_prefix = -1;
96 static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE, pd_mode = IA_MODE_NONE;
97 static bool accept_reconfig = false;
98
99 // Reconfigure key
100 static uint8_t reconf_key[16];
101
102
103 int init_dhcpv6(const char *ifname, int request_pd, int sol_timeout)
104 {
105 request_prefix = request_pd;
106 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_timeout;
107
108 sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
109 if (sock < 0)
110 return -1;
111
112 // Detect interface
113 struct ifreq ifr;
114 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
115 if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0)
116 return -1;
117 ifindex = ifr.ifr_ifindex;
118
119 // Create client DUID
120 size_t client_id_len;
121 odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
122 if (client_id_len == 0) {
123 uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
124 DHCPV6_DUID_LLADDR, 0, 1};
125
126 if (ioctl(sock, SIOCGIFHWADDR, &ifr) >= 0)
127 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
128
129 uint8_t zero[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
130 struct ifreq ifs[100], *ifp, *ifend;
131 struct ifconf ifc;
132 ifc.ifc_req = ifs;
133 ifc.ifc_len = sizeof(ifs);
134
135 if (!memcmp(&duid[8], zero, ETHER_ADDR_LEN) &&
136 ioctl(sock, SIOCGIFCONF, &ifc) >= 0) {
137 // If our interface doesn't have an address...
138 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
139 for (ifp = ifc.ifc_req; ifp < ifend &&
140 !memcmp(&duid[8], zero, ETHER_ADDR_LEN); ifp++) {
141 memcpy(ifr.ifr_name, ifp->ifr_name,
142 sizeof(ifr.ifr_name));
143 if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0)
144 continue;
145 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data,
146 ETHER_ADDR_LEN);
147 }
148 }
149
150 odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
151 }
152
153 // Create ORO
154 uint16_t oro[] = {
155 htons(DHCPV6_OPT_SIP_SERVER_D),
156 htons(DHCPV6_OPT_SIP_SERVER_A),
157 htons(DHCPV6_OPT_DNS_SERVERS),
158 htons(DHCPV6_OPT_DNS_DOMAIN),
159 htons(DHCPV6_OPT_NTP_SERVER),
160 htons(DHCPV6_OPT_AFTR_NAME),
161 htons(DHCPV6_OPT_PD_EXCLUDE),
162 #ifdef EXT_PREFIX_CLASS
163 htons(DHCPV6_OPT_PREFIX_CLASS),
164 #endif
165 };
166 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
167
168 do {
169 // Configure IPv6-options
170 int val = 1;
171 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val)) < 0)
172 break;
173 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0)
174 break;
175 if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val)) < 0)
176 break;
177
178 val = 0;
179 if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val, sizeof(val)) < 0)
180 break;
181 if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname)) < 0)
182 break;
183
184 struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
185 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
186 if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)) < 0)
187 break;
188
189 return 0;
190 } while (0);
191
192 return -1;
193 }
194
195
196 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd)
197 {
198 na_mode = na;
199 pd_mode = pd;
200 }
201
202
203 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
204 {
205 // Build FQDN
206 char fqdn_buf[256];
207 gethostname(fqdn_buf, sizeof(fqdn_buf));
208 struct {
209 uint16_t type;
210 uint16_t len;
211 uint8_t flags;
212 uint8_t data[256];
213 } fqdn;
214 size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
215 sizeof(fqdn.data), NULL, NULL);
216 fqdn.type = htons(DHCPV6_OPT_FQDN);
217 fqdn.len = htons(fqdn_len - 4);
218 fqdn.flags = 0;
219
220
221 // Build Client ID
222 size_t cl_id_len;
223 void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
224
225 // Get Server ID
226 size_t srv_id_len;
227 void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
228
229 // Build IA_PDs
230 size_t ia_pd_entries, ia_pd_len = 0;
231 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
232 ia_pd_entries /= sizeof(*e);
233 struct dhcpv6_ia_hdr hdr_ia_pd = {
234 htons(DHCPV6_OPT_IA_PD),
235 htons(sizeof(hdr_ia_pd) - 4),
236 1, 0, 0
237 };
238
239
240 uint8_t *ia_pd = alloca(ia_pd_entries * (sizeof(struct dhcpv6_ia_prefix) + 10));
241 for (size_t i = 0; i < ia_pd_entries; ++i) {
242 uint8_t ex_len = 0;
243 if (e[i].priority > 0)
244 ex_len = ((e[i].priority - e[i].length - 1) / 8) + 6;
245
246 struct dhcpv6_ia_prefix p = {
247 .type = htons(DHCPV6_OPT_IA_PREFIX),
248 .len = htons(sizeof(p) - 4U + ex_len),
249 .prefix = e[i].length,
250 .addr = e[i].target
251 };
252
253 memcpy(ia_pd + ia_pd_len, &p, sizeof(p));
254 ia_pd_len += sizeof(p);
255
256 if (ex_len) {
257 ia_pd[ia_pd_len++] = 0;
258 ia_pd[ia_pd_len++] = DHCPV6_OPT_PD_EXCLUDE;
259 ia_pd[ia_pd_len++] = 0;
260 ia_pd[ia_pd_len++] = ex_len - 4;
261 ia_pd[ia_pd_len++] = e[i].priority;
262
263 uint32_t excl = ntohl(e[i].router.s6_addr32[1]);
264 excl >>= (64 - e[i].priority);
265 excl <<= 8 - ((e[i].priority - e[i].length) % 8);
266
267 for (size_t i = ex_len - 5; i > 0; --i, excl >>= 8)
268 ia_pd[ia_pd_len + i] = excl & 0xff;
269 ia_pd_len += ex_len - 5;
270 }
271 }
272
273 struct dhcpv6_ia_prefix pref = {
274 .type = htons(DHCPV6_OPT_IA_PREFIX),
275 .len = htons(25), .prefix = request_prefix
276 };
277 if (request_prefix > 0 && ia_pd_len == 0 && type == DHCPV6_MSG_SOLICIT) {
278 ia_pd = (uint8_t*)&pref;
279 ia_pd_len = sizeof(pref);
280 }
281 hdr_ia_pd.len = htons(ntohs(hdr_ia_pd.len) + ia_pd_len);
282
283 // Build IA_NAs
284 size_t ia_na_entries, ia_na_len = 0;
285 void *ia_na = NULL;
286 e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
287 ia_na_entries /= sizeof(*e);
288
289 struct dhcpv6_ia_hdr hdr_ia_na = {
290 htons(DHCPV6_OPT_IA_NA),
291 htons(sizeof(hdr_ia_na) - 4),
292 1, 0, 0
293 };
294
295 struct dhcpv6_ia_addr pa[ia_na_entries];
296 for (size_t i = 0; i < ia_na_entries; ++i) {
297 pa[i].type = htons(DHCPV6_OPT_IA_ADDR);
298 pa[i].len = htons(sizeof(pa[i]) - 4U);
299 pa[i].addr = e[i].target;
300 pa[i].preferred = 0;
301 pa[i].valid = 0;
302 }
303
304 ia_na = pa;
305 ia_na_len = sizeof(pa);
306 hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
307
308 // Reconfigure Accept
309 struct {
310 uint16_t type;
311 uint16_t length;
312 } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
313
314 // Request Information Refresh
315 uint16_t oro_refresh = htons(DHCPV6_OPT_INFO_REFRESH);
316
317 // Prepare Header
318 size_t oro_len;
319 void *oro = odhcp6c_get_state(STATE_ORO, &oro_len);
320 struct {
321 uint8_t type;
322 uint8_t trid[3];
323 uint16_t elapsed_type;
324 uint16_t elapsed_len;
325 uint16_t elapsed_value;
326 uint16_t oro_type;
327 uint16_t oro_len;
328 } hdr = {
329 type, {trid[0], trid[1], trid[2]},
330 htons(DHCPV6_OPT_ELAPSED), htons(2),
331 htons((ecs > 0xffff) ? 0xffff : ecs),
332 htons(DHCPV6_OPT_ORO), htons(oro_len),
333 };
334
335 struct iovec iov[] = {
336 {&hdr, sizeof(hdr)},
337 {oro, oro_len},
338 {&oro_refresh, 0},
339 {cl_id, cl_id_len},
340 {srv_id, srv_id_len},
341 {&reconf_accept, sizeof(reconf_accept)},
342 {&fqdn, fqdn_len},
343 {&hdr_ia_na, sizeof(hdr_ia_na)},
344 {ia_na, ia_na_len},
345 {&hdr_ia_pd, sizeof(hdr_ia_pd)},
346 {ia_pd, ia_pd_len},
347 };
348
349 size_t cnt = ARRAY_SIZE(iov);
350 if (type == DHCPV6_MSG_INFO_REQ) {
351 cnt = 5;
352 iov[2].iov_len = sizeof(oro_refresh);
353 hdr.oro_len = htons(oro_len + sizeof(oro_refresh));
354 } else if (!request_prefix) {
355 cnt = 9;
356 }
357
358 // Disable IAs if not used
359 if (type != DHCPV6_MSG_SOLICIT) {
360 iov[5].iov_len = 0;
361 if (ia_na_len == 0)
362 iov[7].iov_len = 0;
363 if (ia_pd_len == 0)
364 iov[9].iov_len = 0;
365 }
366
367 if (na_mode == IA_MODE_NONE)
368 iov[7].iov_len = 0;
369
370 struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
371 0, ALL_DHCPV6_RELAYS, ifindex};
372 struct msghdr msg = {&srv, sizeof(srv), iov, cnt, NULL, 0, 0};
373
374 sendmsg(sock, &msg, 0);
375 }
376
377
378 static int64_t dhcpv6_rand_delay(int64_t time)
379 {
380 int random;
381 odhcp6c_random(&random, sizeof(random));
382 return (time * ((int64_t)random % 1000LL)) / 10000LL;
383 }
384
385
386 int dhcpv6_request(enum dhcpv6_msg type)
387 {
388 uint8_t rc = 0;
389 uint64_t timeout = UINT32_MAX;
390 struct dhcpv6_retx *retx = &dhcpv6_retx[type];
391
392 if (retx->delay) {
393 struct timespec ts = {0, 0};
394 ts.tv_nsec = dhcpv6_rand_delay(10 * DHCPV6_REQ_DELAY);
395 nanosleep(&ts, NULL);
396 }
397
398 if (type == DHCPV6_MSG_UNKNOWN)
399 timeout = t1;
400 else if (type == DHCPV6_MSG_RENEW)
401 timeout = (t2 > t1) ? t2 - t1 : 0;
402 else if (type == DHCPV6_MSG_REBIND)
403 timeout = (t3 > t2) ? t3 - t2 : 0;
404
405 if (timeout == 0)
406 return -1;
407
408 syslog(LOG_NOTICE, "Starting %s transaction (timeout %llus, max rc %d)",
409 retx->name, (unsigned long long)timeout, retx->max_rc);
410
411 uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
412
413 // Generate transaction ID
414 uint8_t trid[3] = {0, 0, 0};
415 if (type != DHCPV6_MSG_UNKNOWN)
416 odhcp6c_random(trid, sizeof(trid));
417 ssize_t len = -1;
418 int64_t rto = 0;
419
420 do {
421 if (rto == 0) {
422 int64_t delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
423
424 // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
425 while (type == DHCPV6_MSG_SOLICIT && delay <= 0)
426 delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
427
428 rto = (retx->init_timeo * 1000 + delay);
429 }
430 else
431 rto = (2 * rto + dhcpv6_rand_delay(rto));
432
433 if (retx->max_timeo && (rto >= retx->max_timeo * 1000))
434 rto = retx->max_timeo * 1000 +
435 dhcpv6_rand_delay(retx->max_timeo * 1000);
436
437 // Calculate end for this round and elapsed time
438 uint64_t round_end = round_start + rto;
439 elapsed = round_start - start;
440
441 // Don't wait too long
442 if (round_end - start > timeout * 1000)
443 round_end = timeout * 1000 + start;
444
445 // Built and send package
446 if (type != DHCPV6_MSG_UNKNOWN) {
447 if (type != DHCPV6_MSG_SOLICIT)
448 syslog(LOG_NOTICE, "Send %s message (elapsed %llums, rc %d)",
449 retx->name, (unsigned long long)elapsed, rc);
450 dhcpv6_send(type, trid, elapsed / 10);
451 rc++;
452 }
453
454 // Receive rounds
455 for (; len < 0 && round_start < round_end;
456 round_start = odhcp6c_get_milli_time()) {
457 uint8_t buf[1536], cmsg_buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
458 struct iovec iov = {buf, sizeof(buf)};
459 struct msghdr msg = {NULL, 0, &iov, 1,
460 cmsg_buf, sizeof(cmsg_buf), 0};
461 struct in6_pktinfo *pktinfo = NULL;
462
463 // Check for pending signal
464 if (odhcp6c_signal_process())
465 return -1;
466
467 // Set timeout for receiving
468 uint64_t t = round_end - round_start;
469 struct timeval timeout = {t / 1000, (t % 1000) * 1000};
470 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
471 &timeout, sizeof(timeout));
472
473 // Receive cycle
474 len = recvmsg(sock, &msg, 0);
475 if (len < 0)
476 continue;
477
478 for (struct cmsghdr *ch = CMSG_FIRSTHDR(&msg); ch != NULL;
479 ch = CMSG_NXTHDR(&msg, ch)) {
480 if (ch->cmsg_level == SOL_IPV6 &&
481 ch->cmsg_type == IPV6_PKTINFO) {
482 pktinfo = (struct in6_pktinfo *)CMSG_DATA(ch);
483 break;
484 }
485 }
486
487 if (pktinfo == NULL) {
488 len = -1;
489 continue;
490 }
491
492 if (!dhcpv6_response_is_valid(buf, len, trid,
493 type, &pktinfo->ipi6_addr)) {
494 len = -1;
495 continue;
496 }
497
498 uint8_t *opt = &buf[4];
499 uint8_t *opt_end = opt + len - 4;
500
501 round_start = odhcp6c_get_milli_time();
502 elapsed = round_start - start;
503 syslog(LOG_NOTICE, "Got a valid reply after "
504 "%llums", (unsigned long long)elapsed);
505
506 if (retx->handler_reply)
507 len = retx->handler_reply(type, rc, opt, opt_end);
508
509 if (len > 0 && round_end - round_start > 1000)
510 round_end = 1000 + round_start;
511 }
512
513 // Allow
514 if (retx->handler_finish)
515 len = retx->handler_finish();
516 } while (len < 0 && ((elapsed / 1000 < timeout) && (!retx->max_rc || rc < retx->max_rc)));
517
518 return len;
519 }
520
521 // Message validation checks according to RFC3315 chapter 15
522 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
523 const uint8_t transaction[3], enum dhcpv6_msg type,
524 const struct in6_addr *daddr)
525 {
526 const struct dhcpv6_header *rep = buf;
527 if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
528 transaction, sizeof(rep->tr_id)))
529 return false; // Invalid reply
530
531 if (type == DHCPV6_MSG_SOLICIT) {
532 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
533 rep->msg_type != DHCPV6_MSG_REPLY)
534 return false;
535 } else if (type == DHCPV6_MSG_UNKNOWN) {
536 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
537 return false;
538 } else if (rep->msg_type != DHCPV6_MSG_REPLY) {
539 return false;
540 }
541
542 uint8_t *end = ((uint8_t*)buf) + len, *odata,
543 rcmsg = DHCPV6_MSG_UNKNOWN;
544 uint16_t otype, olen;
545 bool clientid_ok = false, serverid_ok = false, rcauth_ok = false,
546 ia_present = false, options_valid = true;
547
548 size_t client_id_len, server_id_len;
549 void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
550 void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
551
552 dhcpv6_for_each_option(&rep[1], end, otype, olen, odata) {
553 if (otype == DHCPV6_OPT_CLIENTID) {
554 clientid_ok = (olen + 4U == client_id_len) && !memcmp(
555 &odata[-4], client_id, client_id_len);
556 } else if (otype == DHCPV6_OPT_SERVERID) {
557 if (server_id_len)
558 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
559 &odata[-4], server_id, server_id_len);
560 else
561 serverid_ok = true;
562 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
563 sizeof(struct dhcpv6_auth_reconfigure)) {
564 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
565 if (r->protocol != 3 || r->algorithm != 1 || r->reconf_type != 2)
566 continue;
567
568 md5_state_t md5;
569 uint8_t serverhash[16], secretbytes[16], hash[16];
570 memcpy(serverhash, r->key, sizeof(serverhash));
571 memset(r->key, 0, sizeof(r->key));
572 memcpy(secretbytes, reconf_key, sizeof(secretbytes));
573
574 for (size_t i = 0; i < sizeof(secretbytes); ++i)
575 secretbytes[i] ^= 0x36;
576
577 md5_init(&md5);
578 md5_append(&md5, secretbytes, sizeof(secretbytes));
579 md5_append(&md5, buf, len);
580 md5_finish(&md5, hash);
581
582 for (size_t i = 0; i < sizeof(secretbytes); ++i) {
583 secretbytes[i] ^= 0x36;
584 secretbytes[i] ^= 0x5c;
585 }
586
587 md5_init(&md5);
588 md5_append(&md5, secretbytes, sizeof(secretbytes));
589 md5_append(&md5, hash, 16);
590 md5_finish(&md5, hash);
591
592 rcauth_ok = !memcmp(hash, serverhash, sizeof(hash));
593 } else if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1) {
594 rcmsg = odata[0];
595 } else if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)) {
596 ia_present = true;
597 if (olen < sizeof(struct dhcpv6_ia_hdr))
598 options_valid = false;
599 }
600 else if ((otype == DHCPV6_OPT_IA_ADDR) || (otype == DHCPV6_OPT_IA_PREFIX) ||
601 (otype == DHCPV6_OPT_PD_EXCLUDE)) {
602 // Options are not allowed on global level
603 options_valid = false;
604 }
605 }
606
607 if (!options_valid)
608 return false;
609
610 if (type == DHCPV6_MSG_INFO_REQ && ia_present)
611 return false;
612
613 if (rep->msg_type == DHCPV6_MSG_RECONF) {
614 if ((rcmsg != DHCPV6_MSG_RENEW && rcmsg != DHCPV6_MSG_INFO_REQ) ||
615 (rcmsg == DHCPV6_MSG_INFO_REQ && ia_present) ||
616 !rcauth_ok || IN6_IS_ADDR_MULTICAST(daddr))
617 return false;
618 }
619
620 return clientid_ok && serverid_ok;
621 }
622
623
624 int dhcpv6_poll_reconfigure(void)
625 {
626 int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
627 if (ret != -1)
628 ret = dhcpv6_request(ret);
629
630 return ret;
631 }
632
633
634 static int dhcpv6_handle_reconfigure(_unused enum dhcpv6_msg orig, const int rc,
635 const void *opt, const void *end)
636 {
637 uint16_t otype, olen;
638 uint8_t *odata, msg = DHCPV6_MSG_RENEW;
639 dhcpv6_for_each_option(opt, end, otype, olen, odata)
640 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1 && (
641 odata[0] == DHCPV6_MSG_RENEW ||
642 odata[0] == DHCPV6_MSG_INFO_REQ))
643 msg = odata[0];
644
645 dhcpv6_handle_reply(DHCPV6_MSG_UNKNOWN, rc, NULL, NULL);
646 return msg;
647 }
648
649
650 // Collect all advertised servers
651 static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
652 const void *opt, const void *end)
653 {
654 uint16_t olen, otype;
655 uint8_t *odata, pref = 0;
656 struct dhcpv6_server_cand cand = {false, false, 0, 0, {0}, NULL, NULL, 0, 0};
657 bool have_na = false;
658 int have_pd = 0;
659
660 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
661 if (orig == DHCPV6_MSG_SOLICIT &&
662 (otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA) &&
663 olen > sizeof(struct dhcpv6_ia_hdr)) {
664 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
665 dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
666 }
667
668 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
669 memcpy(cand.duid, odata, olen);
670 cand.duid_len = olen;
671 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
672 int error = ((int)odata[0] << 8 | (int)odata[1]);
673
674 switch (error) {
675 case DHCPV6_NoPrefixAvail:
676 // Status code on global level
677 if (pd_mode == IA_MODE_FORCE)
678 return -1;
679 cand.preference -= 2000;
680 break;
681
682 case DHCPV6_NoAddrsAvail:
683 // Status code on global level
684 if (na_mode == IA_MODE_FORCE)
685 return -1;
686 break;
687
688 default :
689 break;
690 }
691 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
692 cand.preference >= 0) {
693 cand.preference = pref = odata[0];
694 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
695 cand.wants_reconfigure = true;
696 } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
697 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
698 uint8_t *oend = odata + olen, *d;
699 dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
700 if (otype == DHCPV6_OPT_IA_PREFIX && (olen + 4) >=
701 (uint16_t)sizeof(struct dhcpv6_ia_prefix)) {
702 struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&d[-4];
703 have_pd = p->prefix;
704 }
705 }
706 } else if (otype == DHCPV6_OPT_IA_NA) {
707 struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
708 uint8_t *oend = odata + olen, *d;
709 dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
710 if (otype == DHCPV6_OPT_IA_ADDR)
711 have_na = true;
712 }
713 }
714
715 if ((!have_na && na_mode == IA_MODE_FORCE) ||
716 (!have_pd && pd_mode == IA_MODE_FORCE))
717 return -1;
718
719 if (na_mode != IA_MODE_NONE && !have_na) {
720 cand.has_noaddravail = true;
721 cand.preference -= 1000;
722 }
723
724 if (pd_mode != IA_MODE_NONE) {
725 if (have_pd)
726 cand.preference += 2000 + (128 - have_pd);
727 else
728 cand.preference -= 2000;
729 }
730
731 if (cand.duid_len > 0) {
732 cand.ia_na = odhcp6c_move_state(STATE_IA_NA, &cand.ia_na_len);
733 cand.ia_pd = odhcp6c_move_state(STATE_IA_PD, &cand.ia_pd_len);
734 odhcp6c_add_state(STATE_SERVER_CAND, &cand, sizeof(cand));
735 }
736
737 return (rc > 1 || (pref == 255 && cand.preference > 0)) ? 1 : -1;
738 }
739
740
741 static int dhcpv6_commit_advert(void)
742 {
743 size_t cand_len;
744 struct dhcpv6_server_cand *c = NULL, *cand =
745 odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
746
747 bool retry = false;
748 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
749 if (cand[i].has_noaddravail)
750 retry = true; // We want to try again
751
752 if (!c || c->preference < cand[i].preference)
753 c = &cand[i];
754 }
755
756 if (retry && na_mode == IA_MODE_TRY) {
757 // We give it a second try without the IA_NA
758 na_mode = IA_MODE_NONE;
759 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
760 }
761
762 if (c) {
763 uint16_t hdr[2] = {htons(DHCPV6_OPT_SERVERID),
764 htons(c->duid_len)};
765 odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
766 odhcp6c_add_state(STATE_SERVER_ID, c->duid, c->duid_len);
767 accept_reconfig = c->wants_reconfigure;
768 if (c->ia_na_len)
769 odhcp6c_add_state(STATE_IA_NA, c->ia_na, c->ia_na_len);
770 if (c->ia_pd_len)
771 odhcp6c_add_state(STATE_IA_PD, c->ia_pd, c->ia_pd_len);
772 }
773
774 for (size_t i = 0; i < cand_len / sizeof(*c); ++i) {
775 free(cand[i].ia_na);
776 free(cand[i].ia_pd);
777 }
778 odhcp6c_clear_state(STATE_SERVER_CAND);
779
780 if (!c)
781 return -1;
782 else if ((request_prefix && c->ia_pd_len) || (na_mode != IA_MODE_NONE && c->ia_na_len))
783 return DHCPV6_STATEFUL;
784 else
785 return DHCPV6_STATELESS;
786 }
787
788
789 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig, const int rc,
790 const void *opt, const void *end)
791 {
792 dhcpv6_handle_advert(orig, rc, opt, end);
793 if (dhcpv6_commit_advert() < 0)
794 return -1;
795
796 return dhcpv6_handle_reply(orig, rc, opt, end);
797 }
798
799
800 static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc,
801 const void *opt, const void *end)
802 {
803 uint8_t *odata;
804 uint16_t otype, olen;
805 uint32_t refresh = UINT32_MAX;
806 int ret = 1;
807 bool handled_status_codes[_DHCPV6_Status_Max] = { false, };
808
809 odhcp6c_expire();
810
811 if (orig == DHCPV6_MSG_UNKNOWN) {
812 static time_t last_update = 0;
813 time_t now = odhcp6c_get_milli_time() / 1000;
814
815 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
816 last_update = now;
817
818 t1 -= elapsed;
819 t2 -= elapsed;
820 t3 -= elapsed;
821
822 if (t1 < 0)
823 t1 = 0;
824
825 if (t2 < 0)
826 t2 = 0;
827
828 if (t3 < 0)
829 t3 = 0;
830 }
831
832 if (orig == DHCPV6_MSG_REQUEST && !odhcp6c_is_bound()) {
833 // Delete NA and PD we have in the state from the Advert
834 odhcp6c_clear_state(STATE_IA_NA);
835 odhcp6c_clear_state(STATE_IA_PD);
836 }
837
838 if (opt) {
839 odhcp6c_clear_state(STATE_DNS);
840 odhcp6c_clear_state(STATE_SEARCH);
841 odhcp6c_clear_state(STATE_SNTP_IP);
842 odhcp6c_clear_state(STATE_SNTP_FQDN);
843 odhcp6c_clear_state(STATE_SIP_IP);
844 odhcp6c_clear_state(STATE_SIP_FQDN);
845 odhcp6c_clear_state(STATE_AFTR_NAME);
846 }
847
848 // Parse and find all matching IAs
849 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
850 if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
851 && olen > sizeof(struct dhcpv6_ia_hdr)) {
852 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
853
854 // Test ID
855 if (ia_hdr->iaid != 1)
856 continue;
857
858 uint16_t code = DHCPV6_Success;
859 uint16_t stype, slen;
860 uint8_t *sdata;
861 // Get and handle status code
862 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
863 stype, slen, sdata) {
864 if (stype == DHCPV6_OPT_STATUS && slen >= 2) {
865 uint8_t *mdata = (slen > 2) ? &sdata[2] : NULL;
866 uint16_t mlen = (slen > 2) ? slen - 2 : 0;
867
868 code = ((int)sdata[0]) << 8 | ((int)sdata[1]);
869
870 if (code == DHCPV6_Success)
871 continue;
872
873 dhcpv6_handle_ia_status_code(orig, ia_hdr,
874 code, mdata, mlen, handled_status_codes, &ret);
875
876
877 if (ret > 0)
878 return ret;
879 break;
880 }
881 }
882
883 if (code != DHCPV6_Success)
884 continue;
885
886 dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
887 } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
888 uint8_t *mdata = (olen > 2) ? &odata[2] : NULL;
889 uint16_t mlen = (olen > 2) ? olen - 2 : 0;
890 uint16_t code = ((int)odata[0]) << 8 | ((int)odata[1]);
891
892 dhcpv6_handle_status_code(orig, code, mdata, mlen, &ret);
893 }
894 else if (otype == DHCPV6_OPT_DNS_SERVERS) {
895 if (olen % 16 == 0)
896 odhcp6c_add_state(STATE_DNS, odata, olen);
897 } else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
898 odhcp6c_add_state(STATE_SEARCH, odata, olen);
899 } else if (otype == DHCPV6_OPT_NTP_SERVER) {
900 uint16_t stype, slen;
901 uint8_t *sdata;
902 // Test status and bail if error
903 dhcpv6_for_each_option(odata, odata + olen,
904 stype, slen, sdata) {
905 if (slen == 16 && (stype == NTP_MC_ADDR ||
906 stype == NTP_SRV_ADDR))
907 odhcp6c_add_state(STATE_SNTP_IP,
908 sdata, slen);
909 else if (slen > 0 && stype == NTP_SRV_FQDN)
910 odhcp6c_add_state(STATE_SNTP_FQDN,
911 sdata, slen);
912 }
913 } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
914 if (olen == 16)
915 odhcp6c_add_state(STATE_SIP_IP, odata, olen);
916 } else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
917 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
918 } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
919 refresh = ntohl(*((uint32_t*)odata));
920 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
921 sizeof(struct dhcpv6_auth_reconfigure)) {
922 struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
923 if (r->protocol == 3 && r->algorithm == 1 &&
924 r->reconf_type == 1)
925 memcpy(reconf_key, r->key, sizeof(r->key));
926 } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) {
927 size_t cur_len;
928 odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
929 if (cur_len == 0)
930 odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
931 } else if (otype != DHCPV6_OPT_CLIENTID &&
932 otype != DHCPV6_OPT_SERVERID) {
933 odhcp6c_add_state(STATE_CUSTOM_OPTS,
934 &odata[-4], olen + 4);
935 }
936 }
937
938 if (orig != DHCPV6_MSG_INFO_REQ) {
939 // Update refresh timers if no fatal status code was received
940 if ((ret > 0) && dhcpv6_calc_refresh_timers()) {
941 switch (orig) {
942 case DHCPV6_MSG_RENEW:
943 // Send further renews if T1 is not set
944 if (!t1)
945 ret = -1;
946 break;
947 case DHCPV6_MSG_REBIND:
948 // Send further rebinds if T1 and T2 is not set
949 if (!t1 && !t2)
950 ret = -1;
951 break;
952
953 default :
954 break;
955 }
956 }
957 }
958 else if (ret > 0)
959 t1 = refresh;
960
961 return ret;
962 }
963
964
965 static int dhcpv6_parse_ia(void *opt, void *end)
966 {
967 struct dhcpv6_ia_hdr *ia_hdr = (struct dhcpv6_ia_hdr *)opt;
968 int parsed_ia = 0;
969 uint32_t t1, t2;
970 uint16_t otype, olen;
971 uint8_t *odata;
972
973 t1 = ntohl(ia_hdr->t1);
974 t2 = ntohl(ia_hdr->t2);
975
976 if (t1 > t2)
977 return 0;
978
979 // Update address IA
980 dhcpv6_for_each_option(&ia_hdr[1], end, otype, olen, odata) {
981 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
982 IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0};
983
984 if (otype == DHCPV6_OPT_IA_PREFIX) {
985 struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
986 if (olen + 4U < sizeof(*prefix))
987 continue;
988
989 entry.valid = ntohl(prefix->valid);
990 entry.preferred = ntohl(prefix->preferred);
991
992 if (entry.preferred > entry.valid)
993 continue;
994
995 entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
996 entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
997 if (entry.t1 > entry.t2)
998 entry.t1 = entry.t2;
999
1000 entry.length = prefix->prefix;
1001 entry.target = prefix->addr;
1002 uint16_t stype, slen;
1003 uint8_t *sdata;
1004
1005 #ifdef EXT_PREFIX_CLASS
1006 // Find prefix class, if any
1007 dhcpv6_for_each_option(&prefix[1], odata + olen,
1008 stype, slen, sdata)
1009 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
1010 entry.class = sdata[0] << 8 | sdata[1];
1011 #endif
1012
1013 // Parse PD-exclude
1014 bool ok = true;
1015 dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
1016 odata + olen, stype, slen, sdata) {
1017 if (stype != DHCPV6_OPT_PD_EXCLUDE || slen < 2)
1018 continue;
1019
1020 uint8_t elen = sdata[0];
1021 if (elen > 64)
1022 elen = 64;
1023
1024 if (elen <= 32 || elen <= entry.length) {
1025 ok = false;
1026 continue;
1027 }
1028
1029
1030 uint8_t bytes = ((elen - entry.length - 1) / 8) + 1;
1031 if (slen <= bytes) {
1032 ok = false;
1033 continue;
1034 }
1035
1036 uint32_t exclude = 0;
1037 do {
1038 exclude = exclude << 8 | sdata[bytes];
1039 } while (--bytes);
1040
1041 exclude >>= 8 - ((elen - entry.length) % 8);
1042 exclude <<= 64 - elen;
1043
1044 // Abusing router & priority fields for exclusion
1045 entry.router = entry.target;
1046 entry.router.s6_addr32[1] |= htonl(exclude);
1047 entry.priority = elen;
1048 }
1049
1050 if (ok) {
1051 odhcp6c_update_entry(STATE_IA_PD, &entry);
1052 parsed_ia++;
1053 }
1054
1055 entry.priority = 0;
1056 memset(&entry.router, 0, sizeof(entry.router));
1057 } else if (otype == DHCPV6_OPT_IA_ADDR) {
1058 struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
1059 if (olen + 4U < sizeof(*addr))
1060 continue;
1061
1062 entry.preferred = ntohl(addr->preferred);
1063 entry.valid = ntohl(addr->valid);
1064
1065 if (entry.preferred > entry.valid)
1066 continue;
1067
1068 entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1069 entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1070 if (entry.t1 > entry.t2)
1071 entry.t1 = entry.t2;
1072
1073 entry.length = 128;
1074 entry.target = addr->addr;
1075
1076 #ifdef EXT_PREFIX_CLASS
1077 uint16_t stype, slen;
1078 uint8_t *sdata;
1079 // Find prefix class, if any
1080 dhcpv6_for_each_option(&addr[1], odata + olen,
1081 stype, slen, sdata)
1082 if (stype == DHCPV6_OPT_PREFIX_CLASS && slen == 2)
1083 entry.class = sdata[0] << 8 | sdata[1];
1084 #endif
1085
1086 odhcp6c_update_entry(STATE_IA_NA, &entry);
1087 parsed_ia++;
1088 }
1089 }
1090 return parsed_ia;
1091 }
1092
1093
1094 static int dhcpv6_calc_refresh_timers(void)
1095 {
1096 struct odhcp6c_entry *e;
1097 size_t ia_na_entries, ia_pd_entries, i;
1098 int64_t l_t1 = UINT32_MAX, l_t2 = UINT32_MAX, l_t3 = 0;
1099
1100 e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
1101 ia_na_entries /= sizeof(*e);
1102 for (i = 0; i < ia_na_entries; i++) {
1103 if (e[i].t1 < l_t1)
1104 l_t1 = e[i].t1;
1105
1106 if (e[i].t2 < l_t2)
1107 l_t2 = e[i].t2;
1108
1109 if (e[i].valid > l_t3)
1110 l_t3 = e[i].valid;
1111 }
1112
1113 e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
1114 ia_pd_entries /= sizeof(*e);
1115 for (i = 0; i < ia_pd_entries; i++) {
1116 if (e[i].t1 < l_t1)
1117 l_t1 = e[i].t1;
1118
1119 if (e[i].t2 < l_t2)
1120 l_t2 = e[i].t2;
1121
1122 if (e[i].valid > l_t3)
1123 l_t3 = e[i].valid;
1124 }
1125
1126 if (ia_pd_entries || ia_na_entries) {
1127 t1 = l_t1;
1128 t2 = l_t2;
1129 t3 = l_t3;
1130 }
1131
1132 return (int)(ia_pd_entries + ia_na_entries);
1133 }
1134
1135
1136 static void dhcpv6_log_status_code(const uint16_t code, const char *scope,
1137 const void *status_msg, const int len)
1138 {
1139 uint8_t buf[len + 3];
1140
1141 memset(buf, 0, sizeof(buf));
1142 if (len) {
1143 buf[0] = '(';
1144 memcpy(&buf[1], status_msg, len);
1145 buf[len + 1] = ')';
1146 }
1147
1148 syslog(LOG_WARNING, "Server returned %s status %i %s",
1149 scope, code, buf);
1150 }
1151
1152
1153 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig,
1154 const uint16_t code, const void *status_msg, const int len,
1155 int *ret)
1156 {
1157 dhcpv6_log_status_code(code, "message", status_msg, len);
1158
1159 switch (code) {
1160 case DHCPV6_UnspecFail:
1161 // Generic failure
1162 *ret = 0;
1163 break;
1164
1165 case DHCPV6_UseMulticast:
1166 // TODO handle multicast status code
1167 break;
1168
1169 case DHCPV6_NoAddrsAvail:
1170 case DHCPV6_NoPrefixAvail:
1171 if (orig == DHCPV6_MSG_REQUEST)
1172 *ret = 0; // Failure
1173 break;
1174
1175 default:
1176 break;
1177 }
1178 }
1179
1180
1181 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig,
1182 const struct dhcpv6_ia_hdr *ia_hdr, const uint16_t code,
1183 const void *status_msg, const int len,
1184 bool handled_status_codes[_DHCPV6_Status_Max], int *ret)
1185 {
1186 dhcpv6_log_status_code(code, ia_hdr->type == DHCPV6_OPT_IA_NA ?
1187 "IA_NA" : "IA_PD", status_msg, len);
1188
1189 switch (code) {
1190 case DHCPV6_NoBinding:
1191 switch (orig) {
1192 case DHCPV6_MSG_RENEW:
1193 case DHCPV6_MSG_REBIND:
1194 if ((*ret > 0) && !handled_status_codes[code])
1195 *ret = dhcpv6_request(DHCPV6_MSG_REQUEST);
1196 break;
1197
1198 default:
1199 break;
1200 }
1201 break;
1202
1203 case DHCPV6_NoAddrsAvail:
1204 case DHCPV6_NoPrefixAvail:
1205 switch (orig) {
1206 case DHCPV6_MSG_REQUEST:
1207 if (*ret != 0)
1208 *ret = 0;
1209 break;
1210 default:
1211 break;
1212 }
1213 break;
1214
1215 case DHCPV6_NotOnLink:
1216 // TODO handle not onlink in case of confirm
1217 break;
1218
1219 default:
1220 break;
1221 }
1222 }
Openwrt DHCPv6 Client