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Sources/odhcp6c/src/dhcpv6.c

  1 /**
  2  * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
  3  * Copyright (C) 2017-2018 Hans Dedecker <dedeckeh@gmail.com>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License v2 as published by
  7  * the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  */
 15 
 16 #include <time.h>
 17 #include <fcntl.h>
 18 #include <errno.h>
 19 #include <inttypes.h>
 20 #include <stdlib.h>
 21 #include <signal.h>
 22 #include <limits.h>
 23 #include <resolv.h>
 24 #include <string.h>
 25 #include <unistd.h>
 26 #include <syslog.h>
 27 #include <stdbool.h>
 28 #include <ctype.h>
 29 #include <sys/time.h>
 30 #include <sys/ioctl.h>
 31 #include <sys/socket.h>
 32 #include <arpa/inet.h>
 33 #include <netinet/in.h>
 34 
 35 #include <net/if.h>
 36 #include <net/ethernet.h>
 37 
 38 #include "odhcp6c.h"
 39 #ifdef USE_LIBUBOX
 40 #include <libubox/md5.h>
 41 #else
 42 #include "md5.h"
 43 #endif
 44 
 45 
 46 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
 47                 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
 48 #define DHCPV6_CLIENT_PORT 546
 49 #define DHCPV6_SERVER_PORT 547
 50 #define DHCPV6_DUID_LLADDR 3
 51 #define DHCPV6_REQ_DELAY 1
 52 
 53 #define DHCPV6_SOL_MAX_RT_MIN 60
 54 #define DHCPV6_SOL_MAX_RT_MAX 86400
 55 #define DHCPV6_INF_MAX_RT_MIN 60
 56 #define DHCPV6_INF_MAX_RT_MAX 86400
 57 
 58 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
 59                 const uint8_t transaction[3], enum dhcpv6_msg type,
 60                 const struct in6_addr *daddr);
 61 
 62 static unsigned int dhcpv6_parse_ia(void *opt, void *end);
 63 
 64 static unsigned int dhcpv6_calc_refresh_timers(void);
 65 static void dhcpv6_handle_status_code(_unused const enum dhcpv6_msg orig,
 66                 const uint16_t code, const void *status_msg, const int len,
 67                 int *ret);
 68 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig,
 69                 const struct dhcpv6_ia_hdr *ia_hdr, const uint16_t code,
 70                 const void *status_msg, const int len,
 71                 bool handled_status_codes[_DHCPV6_Status_Max],
 72                 int *ret);
 73 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand *cand);
 74 static void dhcpv6_clear_all_server_cand(void);
 75 
 76 static reply_handler dhcpv6_handle_reply;
 77 static reply_handler dhcpv6_handle_advert;
 78 static reply_handler dhcpv6_handle_rebind_reply;
 79 static reply_handler dhcpv6_handle_reconfigure;
 80 static int dhcpv6_commit_advert(void);
 81 
 82 // RFC 3315 - 5.5 Timeout and Delay values
 83 static struct dhcpv6_retx dhcpv6_retx[_DHCPV6_MSG_MAX] = {
 84         [DHCPV6_MSG_UNKNOWN] = {false, 1, 120, 0, "<POLL>",
 85                         dhcpv6_handle_reconfigure, NULL},
 86         [DHCPV6_MSG_SOLICIT] = {true, 1, DHCPV6_SOL_MAX_RT, 0, "SOLICIT",
 87                         dhcpv6_handle_advert, dhcpv6_commit_advert},
 88         [DHCPV6_MSG_REQUEST] = {true, 1, DHCPV6_REQ_MAX_RT, 10, "REQUEST",
 89                         dhcpv6_handle_reply, NULL},
 90         [DHCPV6_MSG_RENEW] = {false, 10, DHCPV6_REN_MAX_RT, 0, "RENEW",
 91                         dhcpv6_handle_reply, NULL},
 92         [DHCPV6_MSG_REBIND] = {false, 10, DHCPV6_REB_MAX_RT, 0, "REBIND",
 93                         dhcpv6_handle_rebind_reply, NULL},
 94         [DHCPV6_MSG_RELEASE] = {false, 1, 0, 5, "RELEASE", NULL, NULL},
 95         [DHCPV6_MSG_DECLINE] = {false, 1, 0, 5, "DECLINE", NULL, NULL},
 96         [DHCPV6_MSG_INFO_REQ] = {true, 1, DHCPV6_INF_MAX_RT, 0, "INFOREQ",
 97                         dhcpv6_handle_reply, NULL},
 98 };
 99 
100 // Sockets
101 static int sock = -1;
102 static int ifindex = -1;
103 static int64_t t1 = 0, t2 = 0, t3 = 0;
104 
105 // IA states
106 static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE, pd_mode = IA_MODE_NONE;
107 static bool accept_reconfig = false;
108 // Server unicast address
109 static struct in6_addr server_addr = IN6ADDR_ANY_INIT;
110 
111 // Reconfigure key
112 static uint8_t reconf_key[16];
113 
114 // client options
115 static unsigned int client_options = 0;
116 
117 static uint32_t ntohl_unaligned(const uint8_t *data)
118 {
119         uint32_t buf;
120 
121         memcpy(&buf, data, sizeof(buf));
122         return ntohl(buf);
123 }
124 
125 static char *dhcpv6_msg_to_str(enum dhcpv6_msg msg)
126 {
127         switch (msg) {
128         case DHCPV6_MSG_SOLICIT:
129                 return "SOLICIT";
130 
131         case DHCPV6_MSG_ADVERT:
132                 return "ADVERTISE";
133 
134         case DHCPV6_MSG_REQUEST:
135                 return "REQUEST";
136 
137         case DHCPV6_MSG_RENEW:
138                 return "RENEW";
139 
140         case DHCPV6_MSG_REBIND:
141                 return "REBIND";
142 
143         case DHCPV6_MSG_REPLY:
144                 return "REPLY";
145 
146         case DHCPV6_MSG_RELEASE:
147                 return "RELEASE";
148 
149         case DHCPV6_MSG_DECLINE:
150                 return "DECLINE";
151 
152         case DHCPV6_MSG_RECONF:
153                 return "RECONFIGURE";
154 
155         case DHCPV6_MSG_INFO_REQ:
156                 return "INFORMATION REQUEST";
157 
158         default:
159                 break;
160         }
161 
162         return "UNKNOWN";
163 }
164 
165 static char *dhcpv6_status_code_to_str(uint16_t code)
166 {
167         switch (code) {
168         case DHCPV6_Success:
169                 return "Success";
170 
171         case DHCPV6_UnspecFail:
172                 return "Unspecified Failure";
173 
174         case DHCPV6_NoAddrsAvail:
175                 return "No Address Available";
176 
177         case DHCPV6_NoBinding:
178                 return "No Binding";
179 
180         case DHCPV6_NotOnLink:
181                 return "Not On Link";
182 
183         case DHCPV6_UseMulticast:
184                 return "Use Multicast";
185 
186         case DHCPV6_NoPrefixAvail:
187                 return "No Prefix Available";
188 
189         default:
190                 break;
191         }
192 
193         return "Unknown";
194 }
195 
196 int init_dhcpv6(const char *ifname, unsigned int options, int sol_timeout)
197 {
198         client_options = options;
199         dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_timeout;
200 
201         sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
202         if (sock < 0)
203                 goto failure;
204 
205         // Detect interface
206         struct ifreq ifr;
207         memset(&ifr, 0, sizeof(ifr));
208         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
209         if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0)
210                 goto failure;
211 
212         ifindex = ifr.ifr_ifindex;
213 
214         // Create client DUID
215         size_t client_id_len;
216         odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
217         if (client_id_len == 0) {
218                 uint8_t duid[14] = {0, DHCPV6_OPT_CLIENTID, 0, 10, 0,
219                                 DHCPV6_DUID_LLADDR, 0, 1};
220 
221                 if (ioctl(sock, SIOCGIFHWADDR, &ifr) >= 0)
222                         memcpy(&duid[8], ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
223 
224                 uint8_t zero[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
225                 struct ifreq ifs[100], *ifp, *ifend;
226                 struct ifconf ifc;
227                 ifc.ifc_req = ifs;
228                 ifc.ifc_len = sizeof(ifs);
229 
230                 if (!memcmp(&duid[8], zero, ETHER_ADDR_LEN) &&
231                                 ioctl(sock, SIOCGIFCONF, &ifc) >= 0) {
232                         // If our interface doesn't have an address...
233                         ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
234                         for (ifp = ifc.ifc_req; ifp < ifend &&
235                                         !memcmp(&duid[8], zero, ETHER_ADDR_LEN); ifp++) {
236                                 memcpy(ifr.ifr_name, ifp->ifr_name,
237                                                 sizeof(ifr.ifr_name));
238                                 if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0)
239                                         continue;
240 
241                                 memcpy(&duid[8], ifr.ifr_hwaddr.sa_data,
242                                                 ETHER_ADDR_LEN);
243                         }
244                 }
245 
246                 odhcp6c_add_state(STATE_CLIENT_ID, duid, sizeof(duid));
247         }
248 
249         // Create ORO
250         if (!(client_options & DHCPV6_STRICT_OPTIONS)) {
251                 uint16_t oro[] = {
252                         htons(DHCPV6_OPT_SIP_SERVER_D),
253                         htons(DHCPV6_OPT_SIP_SERVER_A),
254                         htons(DHCPV6_OPT_DNS_SERVERS),
255                         htons(DHCPV6_OPT_DNS_DOMAIN),
256                         htons(DHCPV6_OPT_SNTP_SERVERS),
257                         htons(DHCPV6_OPT_NTP_SERVER),
258                         htons(DHCPV6_OPT_AFTR_NAME),
259                         htons(DHCPV6_OPT_PD_EXCLUDE),
260 #ifdef EXT_CER_ID
261                         htons(DHCPV6_OPT_CER_ID),
262 #endif
263                         htons(DHCPV6_OPT_S46_CONT_MAPE),
264                         htons(DHCPV6_OPT_S46_CONT_MAPT),
265                         htons(DHCPV6_OPT_S46_CONT_LW),
266                 };
267                 odhcp6c_add_state(STATE_ORO, oro, sizeof(oro));
268         }
269         // Required oro
270         uint16_t req_oro[] = {
271                 htons(DHCPV6_OPT_INF_MAX_RT),
272                 htons(DHCPV6_OPT_SOL_MAX_RT),
273                 htons(DHCPV6_OPT_INFO_REFRESH),
274         };
275         odhcp6c_add_state(STATE_ORO, req_oro, sizeof(req_oro));
276 
277         // Configure IPv6-options
278         int val = 1;
279         if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val)) < 0)
280                 goto failure;
281 
282         if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0)
283                 goto failure;
284 
285         if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val)) < 0)
286                 goto failure;
287 
288         if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname)) < 0)
289                 goto failure;
290 
291         struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6,
292                 .sin6_port = htons(DHCPV6_CLIENT_PORT), .sin6_flowinfo = 0 };
293 
294         if (bind(sock, (struct sockaddr*)&client_addr, sizeof(client_addr)) < 0)
295                 goto failure;
296 
297         return 0;
298 
299 failure:
300         if (sock >= 0)
301                 close(sock);
302 
303         return -1;
304 }
305 
306 enum {
307         IOV_HDR=0,
308         IOV_ORO,
309         IOV_CL_ID,
310         IOV_SRV_ID,
311         IOV_OPTS,
312         IOV_RECONF_ACCEPT,
313         IOV_FQDN,
314         IOV_HDR_IA_NA,
315         IOV_IA_NA,
316         IOV_IA_PD,
317         IOV_TOTAL
318 };
319 
320 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd)
321 {
322         int mode = DHCPV6_UNKNOWN;
323 
324         na_mode = na;
325         pd_mode = pd;
326 
327         if (na_mode == IA_MODE_NONE && pd_mode == IA_MODE_NONE)
328                 mode = DHCPV6_STATELESS;
329         else if (na_mode == IA_MODE_FORCE || pd_mode == IA_MODE_FORCE)
330                 mode = DHCPV6_STATEFUL;
331 
332         return mode;
333 }
334 
335 static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs)
336 {
337         // Build FQDN
338         char fqdn_buf[256];
339         gethostname(fqdn_buf, sizeof(fqdn_buf));
340         struct {
341                 uint16_t type;
342                 uint16_t len;
343                 uint8_t flags;
344                 uint8_t data[256];
345         } fqdn;
346         size_t fqdn_len = 5 + dn_comp(fqdn_buf, fqdn.data,
347                         sizeof(fqdn.data), NULL, NULL);
348         fqdn.type = htons(DHCPV6_OPT_FQDN);
349         fqdn.len = htons(fqdn_len - 4);
350         fqdn.flags = 0;
351 
352         // Build Client ID
353         size_t cl_id_len;
354         void *cl_id = odhcp6c_get_state(STATE_CLIENT_ID, &cl_id_len);
355 
356         // Get Server ID
357         size_t srv_id_len;
358         void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len);
359 
360         // Build IA_PDs
361         size_t ia_pd_entries = 0, ia_pd_len = 0;
362         uint8_t *ia_pd;
363 
364         if (type == DHCPV6_MSG_SOLICIT) {
365                 odhcp6c_clear_state(STATE_IA_PD);
366                 size_t n_prefixes;
367                 struct odhcp6c_request_prefix *request_prefixes = odhcp6c_get_state(STATE_IA_PD_INIT, &n_prefixes);
368                 n_prefixes /= sizeof(struct odhcp6c_request_prefix);
369 
370                 ia_pd = alloca(n_prefixes * (sizeof(struct dhcpv6_ia_hdr) + sizeof(struct dhcpv6_ia_prefix)));
371 
372                 for (size_t i = 0; i < n_prefixes; i++) {
373                         struct dhcpv6_ia_hdr hdr_ia_pd = {
374                                 htons(DHCPV6_OPT_IA_PD),
375                                 htons(sizeof(hdr_ia_pd) - 4 +
376                                       sizeof(struct dhcpv6_ia_prefix) * !!request_prefixes[i].length),
377                                 request_prefixes[i].iaid, 0, 0
378                         };
379                         struct dhcpv6_ia_prefix pref = {
380                                 .type = htons(DHCPV6_OPT_IA_PREFIX),
381                                 .len = htons(sizeof(pref) - 4),
382                                 .prefix = request_prefixes[i].length
383                         };
384                         memcpy(ia_pd + ia_pd_len, &hdr_ia_pd, sizeof(hdr_ia_pd));
385                         ia_pd_len += sizeof(hdr_ia_pd);
386                         if (request_prefixes[i].length) {
387                                 memcpy(ia_pd + ia_pd_len, &pref, sizeof(pref));
388                                 ia_pd_len += sizeof(pref);
389                         }
390                 }
391         } else {
392                 struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
393                 ia_pd_entries /= sizeof(*e);
394 
395                 // we're too lazy to count our distinct IAIDs,
396                 // so just allocate maximally needed space
397                 ia_pd = alloca(ia_pd_entries * (sizeof(struct dhcpv6_ia_prefix) + 10 +
398                                         sizeof(struct dhcpv6_ia_hdr)));
399 
400                 for (size_t i = 0; i < ia_pd_entries; ++i) {
401                         uint32_t iaid = e[i].iaid;
402 
403                         // check if this is an unprocessed IAID and skip if not.
404                         int new_iaid = 1;
405                         for (int j = i-1; j >= 0; j--) {
406                                 if (e[j].iaid == iaid) {
407                                         new_iaid = 0;
408                                         break;
409                                 }
410                         }
411 
412                         if (!new_iaid)
413                                 continue;
414 
415                         // construct header
416                         struct dhcpv6_ia_hdr hdr_ia_pd = {
417                                 htons(DHCPV6_OPT_IA_PD),
418                                 htons(sizeof(hdr_ia_pd) - 4),
419                                 iaid, 0, 0
420                         };
421 
422                         memcpy(ia_pd + ia_pd_len, &hdr_ia_pd, sizeof(hdr_ia_pd));
423                         struct dhcpv6_ia_hdr *hdr = (struct dhcpv6_ia_hdr *) (ia_pd + ia_pd_len);
424                         ia_pd_len += sizeof(hdr_ia_pd);
425 
426                         for (size_t j = i; j < ia_pd_entries; j++) {
427                                 if (e[j].iaid != iaid)
428                                         continue;
429 
430                                 uint8_t ex_len = 0;
431                                 if (e[j].priority > 0)
432                                         ex_len = ((e[j].priority - e[j].length - 1) / 8) + 6;
433 
434                                 struct dhcpv6_ia_prefix p = {
435                                         .type = htons(DHCPV6_OPT_IA_PREFIX),
436                                         .len = htons(sizeof(p) - 4U + ex_len),
437                                         .prefix = e[j].length,
438                                         .addr = e[j].target
439                                 };
440 
441                                 if (type == DHCPV6_MSG_REQUEST) {
442                                         p.preferred = htonl(e[j].preferred);
443                                         p.valid = htonl(e[j].valid);
444                                 }
445 
446                                 memcpy(ia_pd + ia_pd_len, &p, sizeof(p));
447                                 ia_pd_len += sizeof(p);
448 
449                                 if (ex_len) {
450                                         ia_pd[ia_pd_len++] = 0;
451                                         ia_pd[ia_pd_len++] = DHCPV6_OPT_PD_EXCLUDE;
452                                         ia_pd[ia_pd_len++] = 0;
453                                         ia_pd[ia_pd_len++] = ex_len - 4;
454                                         ia_pd[ia_pd_len++] = e[j].priority;
455 
456                                         uint32_t excl = ntohl(e[j].router.s6_addr32[1]);
457                                         excl >>= (64 - e[j].priority);
458                                         excl <<= 8 - ((e[j].priority - e[j].length) % 8);
459 
460                                         for (size_t i = ex_len - 5; i > 0; --i, excl >>= 8)
461                                                 ia_pd[ia_pd_len + i] = excl & 0xff;
462                                         ia_pd_len += ex_len - 5;
463                                 }
464 
465                                 hdr->len = htons(ntohs(hdr->len) + ntohs(p.len) + 4U);
466                         }
467                 }
468         }
469 
470         // Build IA_NAs
471         size_t ia_na_entries, ia_na_len = 0;
472         void *ia_na = NULL;
473         struct odhcp6c_entry *e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
474         ia_na_entries /= sizeof(*e);
475 
476         struct dhcpv6_ia_hdr hdr_ia_na = {
477                 htons(DHCPV6_OPT_IA_NA),
478                 htons(sizeof(hdr_ia_na) - 4),
479                 htonl(1), 0, 0
480         };
481 
482         struct dhcpv6_ia_addr pa[ia_na_entries];
483         for (size_t i = 0; i < ia_na_entries; ++i) {
484                 pa[i].type = htons(DHCPV6_OPT_IA_ADDR);
485                 pa[i].len = htons(sizeof(pa[i]) - 4U);
486                 pa[i].addr = e[i].target;
487 
488                 if (type == DHCPV6_MSG_REQUEST) {
489                         pa[i].preferred = htonl(e[i].preferred);
490                         pa[i].valid = htonl(e[i].valid);
491                 } else {
492                         pa[i].preferred = 0;
493                         pa[i].valid = 0;
494                 }
495         }
496 
497         ia_na = pa;
498         ia_na_len = sizeof(pa);
499         hdr_ia_na.len = htons(ntohs(hdr_ia_na.len) + ia_na_len);
500 
501         // Reconfigure Accept
502         struct {
503                 uint16_t type;
504                 uint16_t length;
505         } reconf_accept = {htons(DHCPV6_OPT_RECONF_ACCEPT), 0};
506 
507         // Option list
508         size_t opts_len;
509         void *opts = odhcp6c_get_state(STATE_OPTS, &opts_len);
510 
511         // Option Request List
512         size_t oro_entries, oro_len = 0;
513         uint16_t *oro, *s_oro = odhcp6c_get_state(STATE_ORO, &oro_entries);
514 
515         oro_entries /= sizeof(*s_oro);
516         oro = alloca(oro_entries * sizeof(*oro));
517 
518         for (size_t i = 0; i < oro_entries; i++) {
519                 struct odhcp6c_opt *opt = odhcp6c_find_opt(htons(s_oro[i]));
520 
521                 if (opt) {
522                         if (!(opt->flags & OPT_ORO))
523                                 continue;
524 
525                         if ((opt->flags & OPT_ORO_SOLICIT) && type != DHCPV6_MSG_SOLICIT)
526                                 continue;
527 
528                         if ((opt->flags & OPT_ORO_STATELESS) && type != DHCPV6_MSG_INFO_REQ)
529                                 continue;
530 
531                         if ((opt->flags & OPT_ORO_STATEFUL) && type == DHCPV6_MSG_INFO_REQ)
532                                 continue;
533                 }
534 
535                 oro[oro_len++] = s_oro[i];
536         }
537         oro_len *= sizeof(*oro);
538 
539         // Prepare Header
540         struct {
541                 uint8_t type;
542                 uint8_t trid[3];
543                 uint16_t elapsed_type;
544                 uint16_t elapsed_len;
545                 uint16_t elapsed_value;
546                 uint16_t oro_type;
547                 uint16_t oro_len;
548         } hdr = {
549                 type, {trid[0], trid[1], trid[2]},
550                 htons(DHCPV6_OPT_ELAPSED), htons(2),
551                         htons((ecs > 0xffff) ? 0xffff : ecs),
552                 htons(DHCPV6_OPT_ORO), htons(oro_len),
553         };
554 
555         struct iovec iov[IOV_TOTAL] = {
556                 [IOV_HDR] = {&hdr, sizeof(hdr)},
557                 [IOV_ORO] = {oro, oro_len},
558                 [IOV_CL_ID] = {cl_id, cl_id_len},
559                 [IOV_SRV_ID] = {srv_id, srv_id_len},
560                 [IOV_OPTS] = { opts, opts_len },
561                 [IOV_RECONF_ACCEPT] = {&reconf_accept, sizeof(reconf_accept)},
562                 [IOV_FQDN] = {&fqdn, fqdn_len},
563                 [IOV_HDR_IA_NA] = {&hdr_ia_na, sizeof(hdr_ia_na)},
564                 [IOV_IA_NA] = {ia_na, ia_na_len},
565                 [IOV_IA_PD] = {ia_pd, ia_pd_len},
566         };
567 
568         size_t cnt = IOV_TOTAL;
569         if (type == DHCPV6_MSG_INFO_REQ)
570                 cnt = IOV_HDR_IA_NA;
571 
572         // Disable IAs if not used
573         if (type != DHCPV6_MSG_SOLICIT && ia_na_len == 0)
574                 iov[IOV_HDR_IA_NA].iov_len = 0;
575 
576         if (na_mode == IA_MODE_NONE)
577                 iov[IOV_HDR_IA_NA].iov_len = 0;
578 
579         if ((type != DHCPV6_MSG_SOLICIT && type != DHCPV6_MSG_REQUEST) ||
580                         !(client_options & DHCPV6_ACCEPT_RECONFIGURE))
581                 iov[IOV_RECONF_ACCEPT].iov_len = 0;
582 
583         if (!(client_options & DHCPV6_CLIENT_FQDN))
584                 iov[IOV_FQDN].iov_len = 0;
585 
586         struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT),
587                 0, ALL_DHCPV6_RELAYS, ifindex};
588         struct msghdr msg = {.msg_name = &srv, .msg_namelen = sizeof(srv),
589                         .msg_iov = iov, .msg_iovlen = cnt};
590 
591         switch (type) {
592         case DHCPV6_MSG_REQUEST:
593         case DHCPV6_MSG_RENEW:
594         case DHCPV6_MSG_RELEASE:
595         case DHCPV6_MSG_DECLINE:
596                 if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr) &&
597                         odhcp6c_addr_in_scope(&server_addr)) {
598                         srv.sin6_addr = server_addr;
599                         if (!IN6_IS_ADDR_LINKLOCAL(&server_addr))
600                                 srv.sin6_scope_id = 0;
601                 }
602                 break;
603         default:
604                 break;
605         }
606 
607         if (sendmsg(sock, &msg, 0) < 0) {
608                 char in6_str[INET6_ADDRSTRLEN];
609 
610                 syslog(LOG_ERR, "Failed to send %s message to %s (%s)",
611                         dhcpv6_msg_to_str(type),
612                         inet_ntop(AF_INET6, (const void *)&srv.sin6_addr,
613                                 in6_str, sizeof(in6_str)), strerror(errno));
614         }
615 }
616 
617 static int64_t dhcpv6_rand_delay(int64_t time)
618 {
619         int random;
620         odhcp6c_random(&random, sizeof(random));
621 
622         return (time * ((int64_t)random % 1000LL)) / 10000LL;
623 }
624 
625 int dhcpv6_request(enum dhcpv6_msg type)
626 {
627         uint8_t rc = 0;
628         uint64_t timeout = UINT32_MAX;
629         struct dhcpv6_retx *retx = &dhcpv6_retx[type];
630 
631         if (retx->delay) {
632                 struct timespec ts = {0, 0};
633                 ts.tv_nsec = (dhcpv6_rand_delay((10000 * DHCPV6_REQ_DELAY) / 2) + (1000 * DHCPV6_REQ_DELAY) / 2) * 1000000;
634 
635                 while (nanosleep(&ts, &ts) < 0 && errno == EINTR);
636         }
637 
638         if (type == DHCPV6_MSG_UNKNOWN)
639                 timeout = t1;
640         else if (type == DHCPV6_MSG_RENEW)
641                 timeout = (t2 > t1) ? t2 - t1 : ((t1 == UINT32_MAX) ? UINT32_MAX : 0);
642         else if (type == DHCPV6_MSG_REBIND)
643                 timeout = (t3 > t2) ? t3 - t2 : ((t2 == UINT32_MAX) ? UINT32_MAX : 0);
644 
645         if (timeout == 0)
646                 return -1;
647 
648         syslog(LOG_NOTICE, "Starting %s transaction (timeout %"PRIu64"s, max rc %d)",
649                         retx->name, timeout, retx->max_rc);
650 
651         uint64_t start = odhcp6c_get_milli_time(), round_start = start, elapsed;
652 
653         // Generate transaction ID
654         uint8_t trid[3] = {0, 0, 0};
655         if (type != DHCPV6_MSG_UNKNOWN)
656                 odhcp6c_random(trid, sizeof(trid));
657 
658         ssize_t len = -1;
659         int64_t rto = 0;
660 
661         do {
662                 if (rto == 0) {
663                         int64_t delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
664 
665                         // First RT MUST be strictly greater than IRT for solicit messages (RFC3313 17.1.2)
666                         while (type == DHCPV6_MSG_SOLICIT && delay <= 0)
667                                 delay = dhcpv6_rand_delay(retx->init_timeo * 1000);
668 
669                         rto = (retx->init_timeo * 1000 + delay);
670                 } else
671                         rto = (2 * rto + dhcpv6_rand_delay(rto));
672 
673                 if (retx->max_timeo && (rto >= retx->max_timeo * 1000))
674                         rto = retx->max_timeo * 1000 +
675                                 dhcpv6_rand_delay(retx->max_timeo * 1000);
676 
677                 // Calculate end for this round and elapsed time
678                 uint64_t round_end = round_start + rto;
679                 elapsed = round_start - start;
680 
681                 // Don't wait too long if timeout differs from infinite
682                 if ((timeout != UINT32_MAX) && (round_end - start > timeout * 1000))
683                         round_end = timeout * 1000 + start;
684 
685                 // Built and send package
686                 switch (type) {
687                 case DHCPV6_MSG_UNKNOWN:
688                         break;
689                 default:
690                         syslog(LOG_NOTICE, "Send %s message (elapsed %"PRIu64"ms, rc %d)",
691                                         retx->name, elapsed, rc);
692                         // Fall through
693                 case DHCPV6_MSG_SOLICIT:
694                 case DHCPV6_MSG_INFO_REQ:
695                         dhcpv6_send(type, trid, elapsed / 10);
696                         rc++;
697                 }
698 
699                 // Receive rounds
700                 for (; len < 0 && (round_start < round_end);
701                                 round_start = odhcp6c_get_milli_time()) {
702                         uint8_t buf[1536];
703                         union {
704                                 struct cmsghdr hdr;
705                                 uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
706                         } cmsg_buf;
707                         struct iovec iov = {buf, sizeof(buf)};
708                         struct sockaddr_in6 addr;
709                         struct msghdr msg = {.msg_name = &addr, .msg_namelen = sizeof(addr),
710                                         .msg_iov = &iov, .msg_iovlen = 1, .msg_control = cmsg_buf.buf,
711                                         .msg_controllen = sizeof(cmsg_buf)};
712                         struct in6_pktinfo *pktinfo = NULL;
713                         const struct dhcpv6_header *hdr = (const struct dhcpv6_header *)buf;
714 
715                         // Check for pending signal
716                         if (odhcp6c_signal_process())
717                                 return -1;
718 
719                         // Set timeout for receiving
720                         uint64_t t = round_end - round_start;
721                         struct timeval tv = {t / 1000, (t % 1000) * 1000};
722                         if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
723                                         &tv, sizeof(tv)) < 0)
724                                 syslog(LOG_ERR, "setsockopt SO_RCVTIMEO failed (%s)",
725                                                 strerror(errno));
726 
727                         // Receive cycle
728                         len = recvmsg(sock, &msg, 0);
729                         if (len < 0)
730                                 continue;
731 
732                         for (struct cmsghdr *ch = CMSG_FIRSTHDR(&msg); ch != NULL;
733                                 ch = CMSG_NXTHDR(&msg, ch)) {
734                                 if (ch->cmsg_level == SOL_IPV6 &&
735                                         ch->cmsg_type == IPV6_PKTINFO) {
736                                         pktinfo = (struct in6_pktinfo *)CMSG_DATA(ch);
737                                         break;
738                                 }
739                         }
740 
741                         if (pktinfo == NULL) {
742                                 len = -1;
743                                 continue;
744                         }
745 
746                         if (!dhcpv6_response_is_valid(buf, len, trid,
747                                                         type, &pktinfo->ipi6_addr)) {
748                                 len = -1;
749                                 continue;
750                         }
751 
752                         uint8_t *opt = &buf[4];
753                         uint8_t *opt_end = opt + len - 4;
754 
755                         round_start = odhcp6c_get_milli_time();
756                         elapsed = round_start - start;
757                         syslog(LOG_NOTICE, "Got a valid %s after %"PRIu64"ms",
758                                dhcpv6_msg_to_str(hdr->msg_type), elapsed);
759 
760                         if (retx->handler_reply)
761                                 len = retx->handler_reply(type, rc, opt, opt_end, &addr);
762 
763                         if (len > 0 && round_end - round_start > 1000)
764                                 round_end = 1000 + round_start;
765                 }
766 
767                 // Allow
768                 if (retx->handler_finish)
769                         len = retx->handler_finish();
770         } while (len < 0 && ((timeout == UINT32_MAX) || (elapsed / 1000 < timeout)) &&
771                         (!retx->max_rc || rc < retx->max_rc));
772         return len;
773 }
774 
775 // Message validation checks according to RFC3315 chapter 15
776 static bool dhcpv6_response_is_valid(const void *buf, ssize_t len,
777                 const uint8_t transaction[3], enum dhcpv6_msg type,
778                 const struct in6_addr *daddr)
779 {
780         const struct dhcpv6_header *rep = buf;
781         if (len < (ssize_t)sizeof(*rep) || memcmp(rep->tr_id,
782                         transaction, sizeof(rep->tr_id)))
783                 return false; // Invalid reply
784 
785         if (type == DHCPV6_MSG_SOLICIT) {
786                 if (rep->msg_type != DHCPV6_MSG_ADVERT &&
787                                 rep->msg_type != DHCPV6_MSG_REPLY)
788                         return false;
789 
790         } else if (type == DHCPV6_MSG_UNKNOWN) {
791                 if (!accept_reconfig || rep->msg_type != DHCPV6_MSG_RECONF)
792                         return false;
793 
794         } else if (rep->msg_type != DHCPV6_MSG_REPLY)
795                 return false;
796 
797         uint8_t *end = ((uint8_t*)buf) + len, *odata = NULL,
798                 rcmsg = DHCPV6_MSG_UNKNOWN;
799         uint16_t otype, olen = UINT16_MAX;
800         bool clientid_ok = false, serverid_ok = false, rcauth_ok = false,
801                 ia_present = false, options_valid = true;
802 
803         size_t client_id_len, server_id_len;
804         void *client_id = odhcp6c_get_state(STATE_CLIENT_ID, &client_id_len);
805         void *server_id = odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
806 
807         dhcpv6_for_each_option(&rep[1], end, otype, olen, odata) {
808                 if (otype == DHCPV6_OPT_CLIENTID) {
809                         clientid_ok = (olen + 4U == client_id_len) && !memcmp(
810                                         &odata[-4], client_id, client_id_len);
811                 } else if (otype == DHCPV6_OPT_SERVERID) {
812                         if (server_id_len)
813                                 serverid_ok = (olen + 4U == server_id_len) && !memcmp(
814                                                 &odata[-4], server_id, server_id_len);
815                         else
816                                 serverid_ok = true;
817                 } else if (otype == DHCPV6_OPT_AUTH && olen == -4 +
818                                 sizeof(struct dhcpv6_auth_reconfigure)) {
819                         struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
820                         if (r->protocol != 3 || r->algorithm != 1 || r->reconf_type != 2)
821                                 continue;
822 
823                         md5_ctx_t md5;
824                         uint8_t serverhash[16], secretbytes[64];
825                         uint32_t hash[4];
826                         memcpy(serverhash, r->key, sizeof(serverhash));
827                         memset(r->key, 0, sizeof(r->key));
828 
829                         memset(secretbytes, 0, sizeof(secretbytes));
830                         memcpy(secretbytes, reconf_key, sizeof(reconf_key));
831 
832                         for (size_t i = 0; i < sizeof(secretbytes); ++i)
833                                 secretbytes[i] ^= 0x36;
834 
835                         md5_begin(&md5);
836                         md5_hash(secretbytes, sizeof(secretbytes), &md5);
837                         md5_hash(buf, len, &md5);
838                         md5_end(hash, &md5);
839 
840                         for (size_t i = 0; i < sizeof(secretbytes); ++i) {
841                                 secretbytes[i] ^= 0x36;
842                                 secretbytes[i] ^= 0x5c;
843                         }
844 
845                         md5_begin(&md5);
846                         md5_hash(secretbytes, sizeof(secretbytes), &md5);
847                         md5_hash(hash, 16, &md5);
848                         md5_end(hash, &md5);
849 
850                         rcauth_ok = !memcmp(hash, serverhash, sizeof(hash));
851                 } else if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1) {
852                         rcmsg = odata[0];
853                 } else if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)) {
854                         ia_present = true;
855                         if (olen < -4 + sizeof(struct dhcpv6_ia_hdr))
856                                 options_valid = false;
857                 } else if ((otype == DHCPV6_OPT_IA_ADDR) || (otype == DHCPV6_OPT_IA_PREFIX) ||
858                                 (otype == DHCPV6_OPT_PD_EXCLUDE))
859                         // Options are not allowed on global level
860                         options_valid = false;
861         }
862 
863         if (!options_valid || ((odata + olen) > end))
864                 return false;
865 
866         if (type == DHCPV6_MSG_INFO_REQ && ia_present)
867                 return false;
868 
869         if (rep->msg_type == DHCPV6_MSG_RECONF) {
870                 if ((rcmsg != DHCPV6_MSG_RENEW && rcmsg != DHCPV6_MSG_REBIND && rcmsg != DHCPV6_MSG_INFO_REQ) ||
871                         (rcmsg == DHCPV6_MSG_INFO_REQ && ia_present) ||
872                         !rcauth_ok || IN6_IS_ADDR_MULTICAST(daddr))
873                         return false;
874         }
875 
876         return clientid_ok && serverid_ok;
877 }
878 
879 int dhcpv6_poll_reconfigure(void)
880 {
881         int ret = dhcpv6_request(DHCPV6_MSG_UNKNOWN);
882 
883         switch (ret) {
884         /*
885          * Only RENEW/REBIND/INFORMATION REQUEST
886          * message transmission can be requested
887          * by a RECONFIGURE
888          */
889         case DHCPV6_MSG_RENEW:
890         case DHCPV6_MSG_REBIND:
891         case DHCPV6_MSG_INFO_REQ:
892                 ret = dhcpv6_request(ret);
893                 break;
894 
895         default:
896                 break;
897         }
898 
899         return ret;
900 }
901 
902 static int dhcpv6_handle_reconfigure(enum dhcpv6_msg orig, const int rc,
903                 const void *opt, const void *end, _unused const struct sockaddr_in6 *from)
904 {
905         uint16_t otype, olen;
906         uint8_t *odata;
907         enum dhcpv6_msg msg = DHCPV6_MSG_UNKNOWN;
908 
909         dhcpv6_for_each_option(opt, end, otype, olen, odata) {
910                 if (otype == DHCPV6_OPT_RECONF_MESSAGE && olen == 1) {
911                         switch (odata[0]) {
912                         case DHCPV6_MSG_REBIND:
913                                 if (t2 != UINT32_MAX)
914                                         t2 = 0;
915                         // Fall through
916                         case DHCPV6_MSG_RENEW:
917                                 if (t1 != UINT32_MAX)
918                                         t1 = 0;
919                         // Fall through
920                         case DHCPV6_MSG_INFO_REQ:
921                                 msg = odata[0];
922                                 syslog(LOG_NOTICE, "Need to respond with %s in reply to %s",
923                                        dhcpv6_msg_to_str(msg), dhcpv6_msg_to_str(DHCPV6_MSG_RECONF));
924                                 break;
925 
926                         default:
927                                 break;
928                         }
929                 }
930         }
931 
932         if (msg != DHCPV6_MSG_UNKNOWN)
933                 dhcpv6_handle_reply(orig, rc, NULL, NULL, NULL);
934 
935         return (msg == DHCPV6_MSG_UNKNOWN? -1: (int)msg);
936 }
937 
938 // Collect all advertised servers
939 static int dhcpv6_handle_advert(enum dhcpv6_msg orig, const int rc,
940                 const void *opt, const void *end, _unused const struct sockaddr_in6 *from)
941 {
942         uint16_t olen, otype;
943         uint8_t *odata, pref = 0;
944         struct dhcpv6_server_cand cand = {false, false, 0, 0, {0},
945                                         IN6ADDR_ANY_INIT, DHCPV6_SOL_MAX_RT,
946                                         DHCPV6_INF_MAX_RT, NULL, NULL, 0, 0};
947         bool have_na = false;
948         int have_pd = 0;
949 
950         dhcpv6_for_each_option(opt, end, otype, olen, odata) {
951                 if (orig == DHCPV6_MSG_SOLICIT &&
952                                 ((otype == DHCPV6_OPT_IA_PD && pd_mode != IA_MODE_NONE) ||
953                                  (otype == DHCPV6_OPT_IA_NA && na_mode != IA_MODE_NONE)) &&
954                                 olen > -4 + sizeof(struct dhcpv6_ia_hdr)) {
955                         struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
956                         dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
957                 }
958 
959                 if (otype == DHCPV6_OPT_SERVERID && olen <= 130) {
960                         memcpy(cand.duid, odata, olen);
961                         cand.duid_len = olen;
962                 } else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
963                                 cand.preference >= 0) {
964                         cand.preference = pref = odata[0];
965                 } else if (otype == DHCPV6_OPT_UNICAST && olen == sizeof(cand.server_addr)) {
966                         if (!(client_options & DHCPV6_IGNORE_OPT_UNICAST))
967                                 cand.server_addr = *(struct in6_addr *)odata;
968 
969                 } else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
970                         cand.wants_reconfigure = true;
971                 } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
972                         uint32_t sol_max_rt = ntohl_unaligned(odata);
973                         if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
974                                         sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
975                                 cand.sol_max_rt = sol_max_rt;
976 
977                 } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
978                         uint32_t inf_max_rt = ntohl_unaligned(odata);
979                         if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
980                                         inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
981                                 cand.inf_max_rt = inf_max_rt;
982 
983                 } else if (otype == DHCPV6_OPT_IA_PD &&
984                                         olen >= -4 + sizeof(struct dhcpv6_ia_hdr)) {
985                         struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
986                         uint8_t *oend = odata + olen, *d;
987                         dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
988                                 if (otype == DHCPV6_OPT_IA_PREFIX &&
989                                                 olen >= -4 + sizeof(struct dhcpv6_ia_prefix)) {
990                                         struct dhcpv6_ia_prefix *p = (struct dhcpv6_ia_prefix*)&d[-4];
991                                         have_pd = p->prefix;
992                                 }
993                         }
994                 } else if (otype == DHCPV6_OPT_IA_NA &&
995                                         olen >= -4 + sizeof(struct dhcpv6_ia_hdr)) {
996                         struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
997                         uint8_t *oend = odata + olen, *d;
998 
999                         dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
1000                                 if (otype == DHCPV6_OPT_IA_ADDR &&
1001                                                 olen >= -4 + sizeof(struct dhcpv6_ia_addr))
1002                                         have_na = true;
1003                         }
1004                 }
1005         }
1006 
1007         if ((!have_na && na_mode == IA_MODE_FORCE) ||
1008                         (!have_pd && pd_mode == IA_MODE_FORCE)) {
1009                 /*
1010                  * RFC7083 states to process the SOL_MAX_RT and
1011                  * INF_MAX_RT options even if the DHCPv6 server
1012                  * did not propose any IA_NA and/or IA_PD
1013                  */
1014                 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand.sol_max_rt;
1015                 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand.inf_max_rt;
1016                 return -1;
1017         }
1018 
1019         if (na_mode != IA_MODE_NONE && !have_na) {
1020                 cand.has_noaddravail = true;
1021                 cand.preference -= 1000;
1022         }
1023 
1024         if (pd_mode != IA_MODE_NONE) {
1025                 if (have_pd)
1026                         cand.preference += 2000 + (128 - have_pd);
1027                 else
1028                         cand.preference -= 2000;
1029         }
1030 
1031         if (cand.duid_len > 0) {
1032                 cand.ia_na = odhcp6c_move_state(STATE_IA_NA, &cand.ia_na_len);
1033                 cand.ia_pd = odhcp6c_move_state(STATE_IA_PD, &cand.ia_pd_len);
1034                 dhcpv6_add_server_cand(&cand);
1035         }
1036 
1037         return (rc > 1 || (pref == 255 && cand.preference > 0)) ? 1 : -1;
1038 }
1039 
1040 static int dhcpv6_commit_advert(void)
1041 {
1042         return dhcpv6_promote_server_cand();
1043 }
1044 
1045 static int dhcpv6_handle_rebind_reply(enum dhcpv6_msg orig, const int rc,
1046                 const void *opt, const void *end, const struct sockaddr_in6 *from)
1047 {
1048         dhcpv6_handle_advert(orig, rc, opt, end, from);
1049         if (dhcpv6_commit_advert() < 0)
1050                 return -1;
1051 
1052         return dhcpv6_handle_reply(orig, rc, opt, end, from);
1053 }
1054 
1055 static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc,
1056                 const void *opt, const void *end, const struct sockaddr_in6 *from)
1057 {
1058         uint8_t *odata;
1059         uint16_t otype, olen;
1060         uint32_t refresh = 86400;
1061         int ret = 1;
1062         unsigned int state_IAs;
1063         unsigned int updated_IAs = 0;
1064         bool handled_status_codes[_DHCPV6_Status_Max] = { false, };
1065 
1066         odhcp6c_expire(true);
1067 
1068         if (orig == DHCPV6_MSG_UNKNOWN) {
1069                 static time_t last_update = 0;
1070                 time_t now = odhcp6c_get_milli_time() / 1000;
1071 
1072                 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
1073                 last_update = now;
1074 
1075                 if (t1 != UINT32_MAX)
1076                         t1 -= elapsed;
1077 
1078                 if (t2 != UINT32_MAX)
1079                         t2 -= elapsed;
1080 
1081                 if (t3 != UINT32_MAX)
1082                         t3 -= elapsed;
1083 
1084                 if (t1 < 0)
1085                         t1 = 0;
1086 
1087                 if (t2 < 0)
1088                         t2 = 0;
1089 
1090                 if (t3 < 0)
1091                         t3 = 0;
1092         }
1093 
1094         if (orig == DHCPV6_MSG_REQUEST && !odhcp6c_is_bound()) {
1095                 // Delete NA and PD we have in the state from the Advert
1096                 odhcp6c_clear_state(STATE_IA_NA);
1097                 odhcp6c_clear_state(STATE_IA_PD);
1098         }
1099 
1100         if (opt) {
1101                 odhcp6c_clear_state(STATE_DNS);
1102                 odhcp6c_clear_state(STATE_SEARCH);
1103                 odhcp6c_clear_state(STATE_SNTP_IP);
1104                 odhcp6c_clear_state(STATE_NTP_IP);
1105                 odhcp6c_clear_state(STATE_NTP_FQDN);
1106                 odhcp6c_clear_state(STATE_SIP_IP);
1107                 odhcp6c_clear_state(STATE_SIP_FQDN);
1108                 odhcp6c_clear_state(STATE_AFTR_NAME);
1109                 odhcp6c_clear_state(STATE_CER);
1110                 odhcp6c_clear_state(STATE_S46_MAPT);
1111                 odhcp6c_clear_state(STATE_S46_MAPE);
1112                 odhcp6c_clear_state(STATE_S46_LW);
1113                 odhcp6c_clear_state(STATE_PASSTHRU);
1114                 odhcp6c_clear_state(STATE_CUSTOM_OPTS);
1115 
1116                 // Parse and find all matching IAs
1117                 dhcpv6_for_each_option(opt, end, otype, olen, odata) {
1118                         struct odhcp6c_opt *dopt = odhcp6c_find_opt(otype);
1119 
1120                         if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA)
1121                                         && olen > -4 + sizeof(struct dhcpv6_ia_hdr)) {
1122                                 struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]);
1123 
1124                                 if ((na_mode == IA_MODE_NONE && otype == DHCPV6_OPT_IA_NA) ||
1125                                         (pd_mode == IA_MODE_NONE && otype == DHCPV6_OPT_IA_PD))
1126                                         continue;
1127 
1128                                 // Test ID
1129                                 if (ia_hdr->iaid != htonl(1) && otype == DHCPV6_OPT_IA_NA)
1130                                         continue;
1131 
1132                                 uint16_t code = DHCPV6_Success;
1133                                 uint16_t stype, slen;
1134                                 uint8_t *sdata;
1135                                 // Get and handle status code
1136                                 dhcpv6_for_each_option(&ia_hdr[1], odata + olen,
1137                                                 stype, slen, sdata) {
1138                                         if (stype == DHCPV6_OPT_STATUS && slen >= 2) {
1139                                                 uint8_t *mdata = (slen > 2) ? &sdata[2] : NULL;
1140                                                 uint16_t mlen = (slen > 2) ? slen - 2 : 0;
1141 
1142                                                 code = ((int)sdata[0]) << 8 | ((int)sdata[1]);
1143 
1144                                                 if (code == DHCPV6_Success)
1145                                                         continue;
1146 
1147                                                 dhcpv6_handle_ia_status_code(orig, ia_hdr,
1148                                                         code, mdata, mlen, handled_status_codes, &ret);
1149 
1150                                                 if (ret > 0)
1151                                                         return ret;
1152 
1153                                                 break;
1154                                         }
1155                                 }
1156 
1157                                 if (code != DHCPV6_Success)
1158                                         continue;
1159 
1160                                 updated_IAs += dhcpv6_parse_ia(ia_hdr, odata + olen);
1161                         } else if (otype == DHCPV6_OPT_UNICAST && olen == sizeof(server_addr)) {
1162                                 if (!(client_options & DHCPV6_IGNORE_OPT_UNICAST))
1163                                         server_addr = *(struct in6_addr *)odata;
1164 
1165                         }
1166                         else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
1167                                 uint8_t *mdata = (olen > 2) ? &odata[2] : NULL;
1168                                 uint16_t mlen = (olen > 2) ? olen - 2 : 0;
1169                                 uint16_t code = ((int)odata[0]) << 8 | ((int)odata[1]);
1170 
1171                                 dhcpv6_handle_status_code(orig, code, mdata, mlen, &ret);
1172                         } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
1173                                 if (olen % 16 == 0)
1174                                         odhcp6c_add_state(STATE_DNS, odata, olen);
1175                         } else if (otype == DHCPV6_OPT_DNS_DOMAIN)
1176                                 odhcp6c_add_state(STATE_SEARCH, odata, olen);
1177                         else if (otype == DHCPV6_OPT_SNTP_SERVERS) {
1178                                 if (olen % 16 == 0)
1179                                         odhcp6c_add_state(STATE_SNTP_IP, odata, olen);
1180                         } else if (otype == DHCPV6_OPT_NTP_SERVER) {
1181                                 uint16_t stype, slen;
1182                                 uint8_t *sdata;
1183                                 // Test status and bail if error
1184                                 dhcpv6_for_each_option(odata, odata + olen,
1185                                                 stype, slen, sdata) {
1186                                         if (slen == 16 && (stype == NTP_MC_ADDR ||
1187                                                         stype == NTP_SRV_ADDR))
1188                                                 odhcp6c_add_state(STATE_NTP_IP,
1189                                                                 sdata, slen);
1190                                         else if (slen > 0 && stype == NTP_SRV_FQDN)
1191                                                 odhcp6c_add_state(STATE_NTP_FQDN,
1192                                                                 sdata, slen);
1193                                 }
1194                         } else if (otype == DHCPV6_OPT_SIP_SERVER_A) {
1195                                 if (olen == 16)
1196                                         odhcp6c_add_state(STATE_SIP_IP, odata, olen);
1197                         } else if (otype == DHCPV6_OPT_SIP_SERVER_D)
1198                                 odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
1199                         else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
1200                                 refresh = ntohl_unaligned(odata);
1201                         } else if (otype == DHCPV6_OPT_AUTH) {
1202                                 if (olen == -4 + sizeof(struct dhcpv6_auth_reconfigure)) {
1203                                         struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4];
1204                                         if (r->protocol == 3 && r->algorithm == 1 &&
1205                                                         r->reconf_type == 1)
1206                                                 memcpy(reconf_key, r->key, sizeof(r->key));
1207                                 }
1208                         } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) {
1209                                 size_t cur_len;
1210                                 odhcp6c_get_state(STATE_AFTR_NAME, &cur_len);
1211                                 if (cur_len == 0)
1212                                         odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
1213                         } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
1214                                 uint32_t sol_max_rt = ntohl_unaligned(odata);
1215                                 if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
1216                                                 sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
1217                                         dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_max_rt;
1218                         } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
1219                                 uint32_t inf_max_rt = ntohl_unaligned(odata);
1220                                 if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
1221                                                 inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
1222                                         dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = inf_max_rt;
1223         #ifdef EXT_CER_ID
1224                         } else if (otype == DHCPV6_OPT_CER_ID && olen == -4 +
1225                                         sizeof(struct dhcpv6_cer_id)) {
1226                                 struct dhcpv6_cer_id *cer_id = (void*)&odata[-4];
1227                                 struct in6_addr any = IN6ADDR_ANY_INIT;
1228                                 if (memcmp(&cer_id->addr, &any, sizeof(any)))
1229                                         odhcp6c_add_state(STATE_CER, &cer_id->addr, sizeof(any));
1230         #endif
1231                         } else if (otype == DHCPV6_OPT_S46_CONT_MAPT) {
1232                                 odhcp6c_add_state(STATE_S46_MAPT, odata, olen);
1233                         } else if (otype == DHCPV6_OPT_S46_CONT_MAPE) {
1234                                 size_t mape_len;
1235                                 odhcp6c_get_state(STATE_S46_MAPE, &mape_len);
1236                                 if (mape_len == 0)
1237                                         odhcp6c_add_state(STATE_S46_MAPE, odata, olen);
1238                         } else if (otype == DHCPV6_OPT_S46_CONT_LW) {
1239                                 odhcp6c_add_state(STATE_S46_LW, odata, olen);
1240                         } else
1241                                 odhcp6c_add_state(STATE_CUSTOM_OPTS, &odata[-4], olen + 4);
1242 
1243                         if (!dopt || !(dopt->flags & OPT_NO_PASSTHRU))
1244                                 odhcp6c_add_state(STATE_PASSTHRU, &odata[-4], olen + 4);
1245                 }
1246         }
1247 
1248         // Bail out if fatal status code was received
1249         if (ret <= 0)
1250                 return ret;
1251 
1252         switch (orig) {
1253         case DHCPV6_MSG_REQUEST:
1254         case DHCPV6_MSG_REBIND:
1255         case DHCPV6_MSG_RENEW:
1256                 state_IAs = dhcpv6_calc_refresh_timers();
1257                 // In case there're no state IA entries
1258                 // keep sending request/renew/rebind messages
1259                 if (state_IAs == 0) {
1260                         ret = 0;
1261                         break;
1262                 }
1263 
1264                 if (orig == DHCPV6_MSG_REQUEST) {
1265                         // All server candidates can be cleared if not yet bound
1266                         if (!odhcp6c_is_bound())
1267                                 dhcpv6_clear_all_server_cand();
1268 
1269                         odhcp6c_clear_state(STATE_SERVER_ADDR);
1270                         odhcp6c_add_state(STATE_SERVER_ADDR, &from->sin6_addr, 16);
1271                 } else if (orig == DHCPV6_MSG_RENEW) {
1272                         // Send further renews if T1 is not set and if
1273                         // there're IAs which were not in the Reply message
1274                         if (!t1 && state_IAs != updated_IAs) {
1275                                 if (updated_IAs)
1276                                         // Publish updates
1277                                         script_call("updated", 0, false);
1278 
1279                                 /*
1280                                  * RFC8415 states following in §18.2.10.1 :
1281                                  * Sends a Renew/Rebind if any of the IAs are not in the Reply
1282                                  * message, but as this likely indicates that the server that
1283                                  * responded does not support that IA type, sending immediately is
1284                                  * unlikely to produce a different result.  Therefore, the client
1285                                  * MUST rate-limit its transmissions (see Section 14.1) and MAY just
1286                                  * wait for the normal retransmission time (as if the Reply message
1287                                  * had not been received).  The client continues to use other
1288                                  * bindings for which the server did return information
1289                                  */
1290                                 ret = -1;
1291                         }
1292                 } else if (orig == DHCPV6_MSG_REBIND) {
1293                         odhcp6c_clear_state(STATE_SERVER_ADDR);
1294                         odhcp6c_add_state(STATE_SERVER_ADDR, &from->sin6_addr, 16);
1295 
1296                         // Send further rebinds if T1 and T2 is not set and if
1297                         // there're IAs which were not in the Reply message
1298                         if (!t1 && !t2 && state_IAs != updated_IAs) {
1299                                 if (updated_IAs)
1300                                         // Publish updates
1301                                         script_call("updated", 0, false);
1302 
1303                                 /*
1304                                  * RFC8415 states following in §18.2.10.1 :
1305                                  * Sends a Renew/Rebind if any of the IAs are not in the Reply
1306                                  * message, but as this likely indicates that the server that
1307                                  * responded does not support that IA type, sending immediately is
1308                                  * unlikely to produce a different result.  Therefore, the client
1309                                  * MUST rate-limit its transmissions (see Section 14.1) and MAY just
1310                                  * wait for the normal retransmission time (as if the Reply message
1311                                  * had not been received).  The client continues to use other
1312                                  * bindings for which the server did return information
1313                                  */
1314                                 ret = -1;
1315                         }
1316                 }
1317                 break;
1318 
1319         case DHCPV6_MSG_INFO_REQ:
1320                 // All server candidates can be cleared if not yet bound
1321                 if (!odhcp6c_is_bound())
1322                         dhcpv6_clear_all_server_cand();
1323 
1324                 t1 = refresh;
1325                 break;
1326 
1327         default:
1328                 break;
1329         }
1330 
1331         return ret;
1332 }
1333 
1334 static unsigned int dhcpv6_parse_ia(void *opt, void *end)
1335 {
1336         struct dhcpv6_ia_hdr *ia_hdr = (struct dhcpv6_ia_hdr *)opt;
1337         unsigned int updated_IAs = 0;
1338         uint32_t t1, t2;
1339         uint16_t otype, olen;
1340         uint8_t *odata;
1341         char buf[INET6_ADDRSTRLEN];
1342 
1343         t1 = ntohl(ia_hdr->t1);
1344         t2 = ntohl(ia_hdr->t2);
1345 
1346         if (t1 > t2)
1347                 return 0;
1348 
1349         syslog(LOG_INFO, "%s %04x T1 %d T2 %d", ntohs(ia_hdr->type) == DHCPV6_OPT_IA_PD ? "IA_PD" : "IA_NA", ntohl(ia_hdr->iaid), t1, t2);
1350 
1351         // Update address IA
1352         dhcpv6_for_each_option(&ia_hdr[1], end, otype, olen, odata) {
1353                 struct odhcp6c_entry entry = {IN6ADDR_ANY_INIT, 0, 0,
1354                                 IN6ADDR_ANY_INIT, 0, 0, 0, 0, 0, 0};
1355 
1356                 entry.iaid = ia_hdr->iaid;
1357 
1358                 if (otype == DHCPV6_OPT_IA_PREFIX) {
1359                         struct dhcpv6_ia_prefix *prefix = (void*)&odata[-4];
1360                         if (olen + 4U < sizeof(*prefix))
1361                                 continue;
1362 
1363                         entry.valid = ntohl(prefix->valid);
1364                         entry.preferred = ntohl(prefix->preferred);
1365 
1366                         if (entry.preferred > entry.valid)
1367                                 continue;
1368 
1369                         entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1370                         entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1371                         if (entry.t1 > entry.t2)
1372                                 entry.t1 = entry.t2;
1373 
1374                         entry.length = prefix->prefix;
1375                         entry.target = prefix->addr;
1376                         uint16_t stype, slen;
1377                         uint8_t *sdata;
1378 
1379                         // Parse PD-exclude
1380                         bool ok = true;
1381                         dhcpv6_for_each_option(odata + sizeof(*prefix) - 4U,
1382                                         odata + olen, stype, slen, sdata) {
1383                                 if (stype != DHCPV6_OPT_PD_EXCLUDE || slen < 2)
1384                                         continue;
1385 
1386                                 uint8_t elen = sdata[0];
1387                                 if (elen > 64)
1388                                         elen = 64;
1389 
1390                                 if (entry.length < 32 || elen <= entry.length) {
1391                                         ok = false;
1392                                         continue;
1393                                 }
1394 
1395                                 uint8_t bytes = ((elen - entry.length - 1) / 8) + 1;
1396                                 if (slen <= bytes) {
1397                                         ok = false;
1398                                         continue;
1399                                 }
1400 
1401                                 uint32_t exclude = 0;
1402                                 do {
1403                                         exclude = exclude << 8 | sdata[bytes];
1404                                 } while (--bytes);
1405 
1406                                 exclude >>= 8 - ((elen - entry.length) % 8);
1407                                 exclude <<= 64 - elen;
1408 
1409                                 // Abusing router & priority fields for exclusion
1410                                 entry.router = entry.target;
1411                                 entry.router.s6_addr32[1] |= htonl(exclude);
1412                                 entry.priority = elen;
1413                         }
1414 
1415                         if (ok) {
1416                                 if (odhcp6c_update_entry(STATE_IA_PD, &entry, 0, 0))
1417                                         updated_IAs++;
1418 
1419                                 syslog(LOG_INFO, "%s/%d preferred %d valid %d",
1420                                        inet_ntop(AF_INET6, &entry.target, buf, sizeof(buf)),
1421                                        entry.length, entry.preferred , entry.valid);
1422                         }
1423 
1424                         entry.priority = 0;
1425                         memset(&entry.router, 0, sizeof(entry.router));
1426                 } else if (otype == DHCPV6_OPT_IA_ADDR) {
1427                         struct dhcpv6_ia_addr *addr = (void*)&odata[-4];
1428                         if (olen + 4U < sizeof(*addr))
1429                                 continue;
1430 
1431                         entry.preferred = ntohl(addr->preferred);
1432                         entry.valid = ntohl(addr->valid);
1433 
1434                         if (entry.preferred > entry.valid)
1435                                 continue;
1436 
1437                         entry.t1 = (t1 ? t1 : (entry.preferred != UINT32_MAX ? 0.5 * entry.preferred : UINT32_MAX));
1438                         entry.t2 = (t2 ? t2 : (entry.preferred != UINT32_MAX ? 0.8 * entry.preferred : UINT32_MAX));
1439                         if (entry.t1 > entry.t2)
1440                                 entry.t1 = entry.t2;
1441 
1442                         entry.length = 128;
1443                         entry.target = addr->addr;
1444 
1445                         if (odhcp6c_update_entry(STATE_IA_NA, &entry, 0, 0))
1446                                 updated_IAs++;
1447 
1448                         syslog(LOG_INFO, "%s preferred %d valid %d",
1449                                inet_ntop(AF_INET6, &entry.target, buf, sizeof(buf)),
1450                                entry.preferred , entry.valid);
1451                 }
1452         }
1453 
1454         return updated_IAs;
1455 }
1456 
1457 static unsigned int dhcpv6_calc_refresh_timers(void)
1458 {
1459         struct odhcp6c_entry *e;
1460         size_t ia_na_entries, ia_pd_entries, i;
1461         size_t invalid_entries = 0;
1462         int64_t l_t1 = UINT32_MAX, l_t2 = UINT32_MAX, l_t3 = 0;
1463 
1464         e = odhcp6c_get_state(STATE_IA_NA, &ia_na_entries);
1465         ia_na_entries /= sizeof(*e);
1466 
1467         for (i = 0; i < ia_na_entries; i++) {
1468                 /* Exclude invalid IA_NA entries */
1469                 if (!e[i].valid) {
1470                         invalid_entries++;
1471                         continue;
1472                 }
1473 
1474                 if (e[i].t1 < l_t1)
1475                         l_t1 = e[i].t1;
1476 
1477                 if (e[i].t2 < l_t2)
1478                         l_t2 = e[i].t2;
1479 
1480                 if (e[i].valid > l_t3)
1481                         l_t3 = e[i].valid;
1482         }
1483 
1484         e = odhcp6c_get_state(STATE_IA_PD, &ia_pd_entries);
1485         ia_pd_entries /= sizeof(*e);
1486 
1487         for (i = 0; i < ia_pd_entries; i++) {
1488                 /* Exclude invalid IA_PD entries */
1489                 if (!e[i].valid) {
1490                         invalid_entries++;
1491                         continue;
1492                 }
1493 
1494                 if (e[i].t1 < l_t1)
1495                         l_t1 = e[i].t1;
1496 
1497                 if (e[i].t2 < l_t2)
1498                         l_t2 = e[i].t2;
1499 
1500                 if (e[i].valid > l_t3)
1501                         l_t3 = e[i].valid;
1502         }
1503 
1504         if (ia_pd_entries + ia_na_entries - invalid_entries) {
1505                 t1 = l_t1;
1506                 t2 = l_t2;
1507                 t3 = l_t3;
1508 
1509                 syslog(LOG_INFO, "T1 %"PRId64"s, T2 %"PRId64"s, T3 %"PRId64"s", t1, t2, t3);
1510         }
1511 
1512         return (unsigned int)(ia_pd_entries + ia_na_entries);
1513 }
1514 
1515 static void dhcpv6_log_status_code(const uint16_t code, const char *scope,
1516                 const void *status_msg, int len)
1517 {
1518         const char *src = status_msg;
1519         char buf[len + 3];
1520         char *dst = buf;
1521 
1522         if (len) {
1523                 *dst++ = '(';
1524                 while (len--) {
1525                         *dst = isprint((unsigned char)*src) ? *src : '?';
1526                         src++;
1527                         dst++;
1528                 }
1529                 *dst++ = ')';
1530         }
1531 
1532         *dst = 0;
1533 
1534         syslog(LOG_WARNING, "Server returned %s status '%s %s'",
1535                 scope, dhcpv6_status_code_to_str(code), buf);
1536 }
1537 
1538 static void dhcpv6_handle_status_code(const enum dhcpv6_msg orig,
1539                 const uint16_t code, const void *status_msg, const int len,
1540                 int *ret)
1541 {
1542         dhcpv6_log_status_code(code, "message", status_msg, len);
1543 
1544         switch (code) {
1545         case DHCPV6_UnspecFail:
1546                 // Generic failure
1547                 *ret = 0;
1548                 break;
1549 
1550         case DHCPV6_UseMulticast:
1551                 switch(orig) {
1552                 case DHCPV6_MSG_REQUEST:
1553                 case DHCPV6_MSG_RENEW:
1554                 case DHCPV6_MSG_RELEASE:
1555                 case DHCPV6_MSG_DECLINE:
1556                         // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
1557                         server_addr = in6addr_any;
1558                         *ret = 0;
1559                         break;
1560                 default:
1561                         break;
1562                 }
1563                 break;
1564 
1565         case DHCPV6_NoAddrsAvail:
1566         case DHCPV6_NoPrefixAvail:
1567                 if (orig == DHCPV6_MSG_REQUEST)
1568                         *ret = 0; // Failure
1569                 break;
1570 
1571         default:
1572                 break;
1573         }
1574 }
1575 
1576 static void dhcpv6_handle_ia_status_code(const enum dhcpv6_msg orig,
1577                 const struct dhcpv6_ia_hdr *ia_hdr, const uint16_t code,
1578                 const void *status_msg, const int len,
1579                 bool handled_status_codes[_DHCPV6_Status_Max], int *ret)
1580 {
1581         dhcpv6_log_status_code(code, ia_hdr->type == DHCPV6_OPT_IA_NA ?
1582                 "IA_NA" : "IA_PD", status_msg, len);
1583 
1584         switch (code) {
1585         case DHCPV6_NoBinding:
1586                 switch (orig) {
1587                 case DHCPV6_MSG_RENEW:
1588                 case DHCPV6_MSG_REBIND:
1589                         if ((*ret > 0) && !handled_status_codes[code])
1590                                 *ret = dhcpv6_request(DHCPV6_MSG_REQUEST);
1591                         break;
1592 
1593                 default:
1594                         break;
1595                 }
1596                 break;
1597 
1598         default:
1599                 *ret = 0;
1600                 break;
1601         }
1602 }
1603 
1604 // Note this always takes ownership of cand->ia_na and cand->ia_pd
1605 static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand *cand)
1606 {
1607         size_t cand_len, i;
1608         struct dhcpv6_server_cand *c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1609 
1610         // Remove identical duid server candidate
1611         for (i = 0; i < cand_len / sizeof(*c); ++i) {
1612                 if (cand->duid_len == c[i].duid_len &&
1613                                 !memcmp(cand->duid, c[i].duid, cand->duid_len)) {
1614                         free(c[i].ia_na);
1615                         free(c[i].ia_pd);
1616                         odhcp6c_remove_state(STATE_SERVER_CAND, i * sizeof(*c), sizeof(*c));
1617                         break;
1618                 }
1619         }
1620 
1621         for (i = 0, c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1622                 i < cand_len / sizeof(*c); ++i) {
1623                 if (c[i].preference < cand->preference)
1624                         break;
1625         }
1626 
1627         if (odhcp6c_insert_state(STATE_SERVER_CAND, i * sizeof(*c), cand, sizeof(*cand))) {
1628                 free(cand->ia_na);
1629                 free(cand->ia_pd);
1630         }
1631 }
1632 
1633 static void dhcpv6_clear_all_server_cand(void)
1634 {
1635         size_t cand_len, i;
1636         struct dhcpv6_server_cand *c = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1637 
1638         // Server candidates need deep delete for IA_NA/IA_PD
1639         for (i = 0; i < cand_len / sizeof(*c); ++i) {
1640                 free(c[i].ia_na);
1641                 free(c[i].ia_pd);
1642         }
1643         odhcp6c_clear_state(STATE_SERVER_CAND);
1644 }
1645 
1646 int dhcpv6_promote_server_cand(void)
1647 {
1648         size_t cand_len;
1649         struct dhcpv6_server_cand *cand = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len);
1650         uint16_t hdr[2];
1651         int ret = DHCPV6_STATELESS;
1652 
1653         // Clear lingering candidate state info
1654         odhcp6c_clear_state(STATE_SERVER_ID);
1655         odhcp6c_clear_state(STATE_IA_NA);
1656         odhcp6c_clear_state(STATE_IA_PD);
1657 
1658         if (!cand_len)
1659                 return -1;
1660 
1661         if (cand->has_noaddravail && na_mode == IA_MODE_TRY) {
1662                 na_mode = IA_MODE_NONE;
1663 
1664                 dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
1665                 dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
1666 
1667                 return dhcpv6_request(DHCPV6_MSG_SOLICIT);
1668         }
1669 
1670         hdr[0] = htons(DHCPV6_OPT_SERVERID);
1671         hdr[1] = htons(cand->duid_len);
1672         odhcp6c_add_state(STATE_SERVER_ID, hdr, sizeof(hdr));
1673         odhcp6c_add_state(STATE_SERVER_ID, cand->duid, cand->duid_len);
1674         accept_reconfig = cand->wants_reconfigure;
1675 
1676         if (cand->ia_na_len) {
1677                 odhcp6c_add_state(STATE_IA_NA, cand->ia_na, cand->ia_na_len);
1678                 free(cand->ia_na);
1679                 if (na_mode != IA_MODE_NONE)
1680                         ret = DHCPV6_STATEFUL;
1681         }
1682 
1683         if (cand->ia_pd_len) {
1684                 odhcp6c_add_state(STATE_IA_PD, cand->ia_pd, cand->ia_pd_len);
1685                 free(cand->ia_pd);
1686                 if (pd_mode != IA_MODE_NONE)
1687                         ret = DHCPV6_STATEFUL;
1688         }
1689 
1690         dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = cand->sol_max_rt;
1691         dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = cand->inf_max_rt;
1692 
1693         odhcp6c_remove_state(STATE_SERVER_CAND, 0, sizeof(*cand));
1694 
1695         return ret;
1696 }
1697 

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