1: /* dnsmasq is Copyright (c) 2000-2014 Simon Kelley
2:
3: This program is free software; you can redistribute it and/or modify
4: it under the terms of the GNU General Public License as published by
5: the Free Software Foundation; version 2 dated June, 1991, or
6: (at your option) version 3 dated 29 June, 2007.
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: You should have received a copy of the GNU General Public License
14: along with this program. If not, see <http://www.gnu.org/licenses/>.
15: */
16:
17: #include "dnsmasq.h"
18:
19: #ifdef HAVE_DHCP6
20:
21: #include <netinet/icmp6.h>
22:
23: struct iface_param {
24: struct dhcp_context *current;
25: struct dhcp_relay *relay;
26: struct in6_addr fallback, relay_local, ll_addr, ula_addr;
27: int ind, addr_match;
28: };
29:
30: struct mac_param {
31: struct in6_addr *target;
32: unsigned char *mac;
33: unsigned int maclen;
34: };
35:
36:
37: static int complete_context6(struct in6_addr *local, int prefix,
38: int scope, int if_index, int flags,
39: unsigned int preferred, unsigned int valid, void *vparam);
40: static int find_mac(int family, char *addrp, char *mac, size_t maclen, void *parmv);
41: static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm);
42:
43: void dhcp6_init(void)
44: {
45: int fd;
46: struct sockaddr_in6 saddr;
47: #if defined(IPV6_TCLASS) && defined(IPTOS_CLASS_CS6)
48: int class = IPTOS_CLASS_CS6;
49: #endif
50: int oneopt = 1;
51:
52: if ((fd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == -1 ||
53: #if defined(IPV6_TCLASS) && defined(IPTOS_CLASS_CS6)
54: setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &class, sizeof(class)) == -1 ||
55: #endif
56: setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &oneopt, sizeof(oneopt)) == -1 ||
57: !fix_fd(fd) ||
58: !set_ipv6pktinfo(fd))
59: die (_("cannot create DHCPv6 socket: %s"), NULL, EC_BADNET);
60:
61: /* When bind-interfaces is set, there might be more than one dnmsasq
62: instance binding port 547. That's OK if they serve different networks.
63: Need to set REUSEADDR|REUSEPORT to make this posible.
64: Handle the case that REUSEPORT is defined, but the kernel doesn't
65: support it. This handles the introduction of REUSEPORT on Linux. */
66: if (option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND))
67: {
68: int rc = 0;
69:
70: #ifdef SO_REUSEPORT
71: if ((rc = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &oneopt, sizeof(oneopt))) == -1 &&
72: errno == ENOPROTOOPT)
73: rc = 0;
74: #endif
75:
76: if (rc != -1)
77: rc = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &oneopt, sizeof(oneopt));
78:
79: if (rc == -1)
80: die(_("failed to set SO_REUSE{ADDR|PORT} on DHCPv6 socket: %s"), NULL, EC_BADNET);
81: }
82:
83: memset(&saddr, 0, sizeof(saddr));
84: #ifdef HAVE_SOCKADDR_SA_LEN
85: saddr.sin6_len = sizeof(struct sockaddr_in6);
86: #endif
87: saddr.sin6_family = AF_INET6;
88: saddr.sin6_addr = in6addr_any;
89: saddr.sin6_port = htons(DHCPV6_SERVER_PORT);
90:
91: if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in6)))
92: die(_("failed to bind DHCPv6 server socket: %s"), NULL, EC_BADNET);
93:
94: daemon->dhcp6fd = fd;
95: }
96:
97: void dhcp6_packet(time_t now)
98: {
99: struct dhcp_context *context;
100: struct dhcp_relay *relay;
101: struct iface_param parm;
102: struct cmsghdr *cmptr;
103: struct msghdr msg;
104: int if_index = 0;
105: union {
106: struct cmsghdr align; /* this ensures alignment */
107: char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
108: } control_u;
109: struct sockaddr_in6 from;
110: ssize_t sz;
111: struct ifreq ifr;
112: struct iname *tmp;
113: unsigned short port;
114: struct in6_addr dst_addr;
115:
116: memset(&dst_addr, 0, sizeof(dst_addr));
117:
118: msg.msg_control = control_u.control6;
119: msg.msg_controllen = sizeof(control_u);
120: msg.msg_flags = 0;
121: msg.msg_name = &from;
122: msg.msg_namelen = sizeof(from);
123: msg.msg_iov = &daemon->dhcp_packet;
124: msg.msg_iovlen = 1;
125:
126: if ((sz = recv_dhcp_packet(daemon->dhcp6fd, &msg)) == -1)
127: return;
128:
129: for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
130: if (cmptr->cmsg_level == IPPROTO_IPV6 && cmptr->cmsg_type == daemon->v6pktinfo)
131: {
132: union {
133: unsigned char *c;
134: struct in6_pktinfo *p;
135: } p;
136: p.c = CMSG_DATA(cmptr);
137:
138: if_index = p.p->ipi6_ifindex;
139: dst_addr = p.p->ipi6_addr;
140: }
141:
142: if (!indextoname(daemon->dhcp6fd, if_index, ifr.ifr_name))
143: return;
144:
145: if ((port = relay_reply6(&from, sz, ifr.ifr_name)) == 0)
146: {
147: for (tmp = daemon->if_except; tmp; tmp = tmp->next)
148: if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name))
149: return;
150:
151: for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
152: if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name))
153: return;
154:
155: parm.current = NULL;
156: parm.relay = NULL;
157: memset(&parm.relay_local, 0, IN6ADDRSZ);
158: parm.ind = if_index;
159: parm.addr_match = 0;
160: memset(&parm.fallback, 0, IN6ADDRSZ);
161: memset(&parm.ll_addr, 0, IN6ADDRSZ);
162: memset(&parm.ula_addr, 0, IN6ADDRSZ);
163:
164: for (context = daemon->dhcp6; context; context = context->next)
165: if (IN6_IS_ADDR_UNSPECIFIED(&context->start6) && context->prefix == 0)
166: {
167: /* wildcard context for DHCP-stateless only */
168: parm.current = context;
169: context->current = NULL;
170: }
171: else
172: {
173: /* unlinked contexts are marked by context->current == context */
174: context->current = context;
175: memset(&context->local6, 0, IN6ADDRSZ);
176: }
177:
178: for (relay = daemon->relay6; relay; relay = relay->next)
179: relay->current = relay;
180:
181: if (!iface_enumerate(AF_INET6, &parm, complete_context6))
182: return;
183:
184: if (daemon->if_names || daemon->if_addrs)
185: {
186:
187: for (tmp = daemon->if_names; tmp; tmp = tmp->next)
188: if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name))
189: break;
190:
191: if (!tmp && !parm.addr_match)
192: return;
193: }
194:
195: if (parm.relay)
196: {
197: /* Ignore requests sent to the ALL_SERVERS multicast address for relay when
198: we're listening there for DHCPv6 server reasons. */
199: struct in6_addr all_servers;
200:
201: inet_pton(AF_INET6, ALL_SERVERS, &all_servers);
202:
203: if (!IN6_ARE_ADDR_EQUAL(&dst_addr, &all_servers))
204: relay_upstream6(parm.relay, sz, &from.sin6_addr, from.sin6_scope_id);
205: return;
206: }
207:
208: /* May have configured relay, but not DHCP server */
209: if (!daemon->doing_dhcp6)
210: return;
211:
212: lease_prune(NULL, now); /* lose any expired leases */
213:
214: port = dhcp6_reply(parm.current, if_index, ifr.ifr_name, &parm.fallback,
215: &parm.ll_addr, &parm.ula_addr, sz, &from.sin6_addr, now);
216:
217: lease_update_file(now);
218: lease_update_dns(0);
219: }
220:
221: /* The port in the source address of the original request should
222: be correct, but at least once client sends from the server port,
223: so we explicitly send to the client port to a client, and the
224: server port to a relay. */
225: if (port != 0)
226: {
227: from.sin6_port = htons(port);
228: while (sendto(daemon->dhcp6fd, daemon->outpacket.iov_base, save_counter(0),
229: 0, (struct sockaddr *)&from, sizeof(from)) == -1 &&
230: retry_send());
231: }
232: }
233:
234: void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac, unsigned int *maclenp, unsigned int *mactypep)
235: {
236: /* Recieving a packet from a host does not populate the neighbour
237: cache, so we send a neighbour discovery request if we can't
238: find the sender. Repeat a few times in case of packet loss. */
239:
240: struct neigh_packet neigh;
241: struct sockaddr_in6 addr;
242: struct mac_param mac_param;
243: int i;
244:
245: neigh.type = ND_NEIGHBOR_SOLICIT;
246: neigh.code = 0;
247: neigh.reserved = 0;
248: neigh.target = *client;
249:
250: memset(&addr, 0, sizeof(addr));
251: #ifdef HAVE_SOCKADDR_SA_LEN
252: addr.sin6_len = sizeof(struct sockaddr_in6);
253: #endif
254: addr.sin6_family = AF_INET6;
255: addr.sin6_port = htons(IPPROTO_ICMPV6);
256: addr.sin6_addr = *client;
257: addr.sin6_scope_id = iface;
258:
259: mac_param.target = client;
260: mac_param.maclen = 0;
261: mac_param.mac = mac;
262:
263: for (i = 0; i < 5; i++)
264: {
265: struct timespec ts;
266:
267: iface_enumerate(AF_UNSPEC, &mac_param, find_mac);
268:
269: if (mac_param.maclen != 0)
270: break;
271:
272: sendto(daemon->icmp6fd, &neigh, sizeof(neigh), 0, (struct sockaddr *)&addr, sizeof(addr));
273:
274: ts.tv_sec = 0;
275: ts.tv_nsec = 100000000; /* 100ms */
276: nanosleep(&ts, NULL);
277: }
278:
279: *maclenp = mac_param.maclen;
280: *mactypep = ARPHRD_ETHER;
281: }
282:
283: static int find_mac(int family, char *addrp, char *mac, size_t maclen, void *parmv)
284: {
285: struct mac_param *parm = parmv;
286:
287: if (family == AF_INET6 && IN6_ARE_ADDR_EQUAL(parm->target, (struct in6_addr *)addrp))
288: {
289: if (maclen <= DHCP_CHADDR_MAX)
290: {
291: parm->maclen = maclen;
292: memcpy(parm->mac, mac, maclen);
293: }
294:
295: return 0; /* found, abort */
296: }
297:
298: return 1;
299: }
300:
301: static int complete_context6(struct in6_addr *local, int prefix,
302: int scope, int if_index, int flags, unsigned int preferred,
303: unsigned int valid, void *vparam)
304: {
305: struct dhcp_context *context;
306: struct dhcp_relay *relay;
307: struct iface_param *param = vparam;
308: struct iname *tmp;
309:
310: (void)scope; /* warning */
311:
312: if (if_index == param->ind)
313: {
314: if (IN6_IS_ADDR_LINKLOCAL(local))
315: param->ll_addr = *local;
316: else if (IN6_IS_ADDR_ULA(local))
317: param->ula_addr = *local;
318:
319: if (!IN6_IS_ADDR_LOOPBACK(local) &&
320: !IN6_IS_ADDR_LINKLOCAL(local) &&
321: !IN6_IS_ADDR_MULTICAST(local))
322: {
323: /* if we have --listen-address config, see if the
324: arrival interface has a matching address. */
325: for (tmp = daemon->if_addrs; tmp; tmp = tmp->next)
326: if (tmp->addr.sa.sa_family == AF_INET6 &&
327: IN6_ARE_ADDR_EQUAL(&tmp->addr.in6.sin6_addr, local))
328: param->addr_match = 1;
329:
330: /* Determine a globally address on the arrival interface, even
331: if we have no matching dhcp-context, because we're only
332: allocating on remote subnets via relays. This
333: is used as a default for the DNS server option. */
334: param->fallback = *local;
335:
336: for (context = daemon->dhcp6; context; context = context->next)
337: {
338: if ((context->flags & CONTEXT_DHCP) &&
339: !(context->flags & (CONTEXT_TEMPLATE | CONTEXT_OLD)) &&
340: prefix <= context->prefix &&
341: is_same_net6(local, &context->start6, context->prefix) &&
342: is_same_net6(local, &context->end6, context->prefix))
343: {
344:
345:
346: /* link it onto the current chain if we've not seen it before */
347: if (context->current == context)
348: {
349: struct dhcp_context *tmp, **up;
350:
351: /* use interface values only for contructed contexts */
352: if (!(context->flags & CONTEXT_CONSTRUCTED))
353: preferred = valid = 0xffffffff;
354: else if (flags & IFACE_DEPRECATED)
355: preferred = 0;
356:
357: if (context->flags & CONTEXT_DEPRECATE)
358: preferred = 0;
359:
360: /* order chain, longest preferred time first */
361: for (up = ¶m->current, tmp = param->current; tmp; tmp = tmp->current)
362: if (tmp->preferred <= preferred)
363: break;
364: else
365: up = &tmp->current;
366:
367: context->current = *up;
368: *up = context;
369: context->local6 = *local;
370: context->preferred = preferred;
371: context->valid = valid;
372: }
373: }
374: }
375: }
376:
377: for (relay = daemon->relay6; relay; relay = relay->next)
378: if (IN6_ARE_ADDR_EQUAL(local, &relay->local.addr.addr6) && relay->current == relay &&
379: (IN6_IS_ADDR_UNSPECIFIED(¶m->relay_local) || IN6_ARE_ADDR_EQUAL(local, ¶m->relay_local)))
380: {
381: relay->current = param->relay;
382: param->relay = relay;
383: param->relay_local = *local;
384: }
385:
386: }
387:
388: return 1;
389: }
390:
391: struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net, int prefix, u64 addr)
392: {
393: struct dhcp_config *config;
394:
395: for (config = configs; config; config = config->next)
396: if ((config->flags & CONFIG_ADDR6) &&
397: is_same_net6(&config->addr6, net, prefix) &&
398: (prefix == 128 || addr6part(&config->addr6) == addr))
399: return config;
400:
401: return NULL;
402: }
403:
404: struct dhcp_context *address6_allocate(struct dhcp_context *context, unsigned char *clid, int clid_len, int temp_addr,
405: int iaid, int serial, struct dhcp_netid *netids, int plain_range, struct in6_addr *ans)
406: {
407: /* Find a free address: exclude anything in use and anything allocated to
408: a particular hwaddr/clientid/hostname in our configuration.
409: Try to return from contexts which match netids first.
410:
411: Note that we assume the address prefix lengths are 64 or greater, so we can
412: get by with 64 bit arithmetic.
413: */
414:
415: u64 start, addr;
416: struct dhcp_context *c, *d;
417: int i, pass;
418: u64 j;
419:
420: /* hash hwaddr: use the SDBM hashing algorithm. This works
421: for MAC addresses, let's see how it manages with client-ids!
422: For temporary addresses, we generate a new random one each time. */
423: if (temp_addr)
424: j = rand64();
425: else
426: for (j = iaid, i = 0; i < clid_len; i++)
427: j += clid[i] + (j << 6) + (j << 16) - j;
428:
429: for (pass = 0; pass <= plain_range ? 1 : 0; pass++)
430: for (c = context; c; c = c->current)
431: if (c->flags & (CONTEXT_DEPRECATE | CONTEXT_STATIC | CONTEXT_RA_STATELESS | CONTEXT_USED))
432: continue;
433: else if (!match_netid(c->filter, netids, pass))
434: continue;
435: else
436: {
437: if (!temp_addr && option_bool(OPT_CONSEC_ADDR))
438: /* seed is largest extant lease addr in this context */
439: start = lease_find_max_addr6(c) + serial;
440: else
441: start = addr6part(&c->start6) + ((j + c->addr_epoch) % (1 + addr6part(&c->end6) - addr6part(&c->start6)));
442:
443: /* iterate until we find a free address. */
444: addr = start;
445:
446: do {
447: /* eliminate addresses in use by the server. */
448: for (d = context; d; d = d->current)
449: if (addr == addr6part(&d->local6))
450: break;
451:
452: if (!d &&
453: !lease6_find_by_addr(&c->start6, c->prefix, addr) &&
454: !config_find_by_address6(daemon->dhcp_conf, &c->start6, c->prefix, addr))
455: {
456: *ans = c->start6;
457: setaddr6part (ans, addr);
458: return c;
459: }
460:
461: addr++;
462:
463: if (addr == addr6part(&c->end6) + 1)
464: addr = addr6part(&c->start6);
465:
466: } while (addr != start);
467: }
468:
469: return NULL;
470: }
471:
472: /* can dynamically allocate addr */
473: struct dhcp_context *address6_available(struct dhcp_context *context,
474: struct in6_addr *taddr,
475: struct dhcp_netid *netids,
476: int plain_range)
477: {
478: u64 start, end, addr = addr6part(taddr);
479: struct dhcp_context *tmp;
480:
481: for (tmp = context; tmp; tmp = tmp->current)
482: {
483: start = addr6part(&tmp->start6);
484: end = addr6part(&tmp->end6);
485:
486: if (!(tmp->flags & (CONTEXT_STATIC | CONTEXT_RA_STATELESS)) &&
487: is_same_net6(&tmp->start6, taddr, tmp->prefix) &&
488: is_same_net6(&tmp->end6, taddr, tmp->prefix) &&
489: addr >= start &&
490: addr <= end &&
491: match_netid(tmp->filter, netids, plain_range))
492: return tmp;
493: }
494:
495: return NULL;
496: }
497:
498: /* address OK if configured */
499: struct dhcp_context *address6_valid(struct dhcp_context *context,
500: struct in6_addr *taddr,
501: struct dhcp_netid *netids,
502: int plain_range)
503: {
504: struct dhcp_context *tmp;
505:
506: for (tmp = context; tmp; tmp = tmp->current)
507: if (is_same_net6(&tmp->start6, taddr, tmp->prefix) &&
508: match_netid(tmp->filter, netids, plain_range))
509: return tmp;
510:
511: return NULL;
512: }
513:
514: int config_valid(struct dhcp_config *config, struct dhcp_context *context, struct in6_addr *addr)
515: {
516: if (!config || !(config->flags & CONFIG_ADDR6))
517: return 0;
518:
519: if ((config->flags & CONFIG_WILDCARD) && context->prefix == 64)
520: {
521: *addr = context->start6;
522: setaddr6part(addr, addr6part(&config->addr6));
523: return 1;
524: }
525:
526: if (is_same_net6(&context->start6, &config->addr6, context->prefix))
527: {
528: *addr = config->addr6;
529: return 1;
530: }
531:
532: return 0;
533: }
534:
535: void make_duid(time_t now)
536: {
537: (void)now;
538:
539: if (daemon->duid_config)
540: {
541: unsigned char *p;
542:
543: daemon->duid = p = safe_malloc(daemon->duid_config_len + 6);
544: daemon->duid_len = daemon->duid_config_len + 6;
545: PUTSHORT(2, p); /* DUID_EN */
546: PUTLONG(daemon->duid_enterprise, p);
547: memcpy(p, daemon->duid_config, daemon->duid_config_len);
548: }
549: else
550: {
551: time_t newnow = 0;
552:
553: /* If we have no persistent lease database, or a non-stable RTC, use DUID_LL (newnow == 0) */
554: #ifndef HAVE_BROKEN_RTC
555: /* rebase epoch to 1/1/2000 */
556: if (!option_bool(OPT_LEASE_RO) || daemon->lease_change_command)
557: newnow = now - 946684800;
558: #endif
559:
560: iface_enumerate(AF_LOCAL, &newnow, make_duid1);
561:
562: if(!daemon->duid)
563: die("Cannot create DHCPv6 server DUID: %s", NULL, EC_MISC);
564: }
565: }
566:
567: static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm)
568: {
569: /* create DUID as specified in RFC3315. We use the MAC of the
570: first interface we find that isn't loopback or P-to-P and
571: has address-type < 256. Address types above 256 are things like
572: tunnels which don't have usable MAC addresses. */
573:
574: unsigned char *p;
575: (void)index;
576: (void)parm;
577: time_t newnow = *((time_t *)parm);
578:
579: if (type >= 256)
580: return 1;
581:
582: if (newnow == 0)
583: {
584: daemon->duid = p = safe_malloc(maclen + 4);
585: daemon->duid_len = maclen + 4;
586: PUTSHORT(3, p); /* DUID_LL */
587: PUTSHORT(type, p); /* address type */
588: }
589: else
590: {
591: daemon->duid = p = safe_malloc(maclen + 8);
592: daemon->duid_len = maclen + 8;
593: PUTSHORT(1, p); /* DUID_LLT */
594: PUTSHORT(type, p); /* address type */
595: PUTLONG(*((time_t *)parm), p); /* time */
596: }
597:
598: memcpy(p, mac, maclen);
599:
600: return 0;
601: }
602:
603: struct cparam {
604: time_t now;
605: int newone, newname;
606: };
607:
608: static int construct_worker(struct in6_addr *local, int prefix,
609: int scope, int if_index, int flags,
610: int preferred, int valid, void *vparam)
611: {
612: char ifrn_name[IFNAMSIZ];
613: struct in6_addr start6, end6;
614: struct dhcp_context *template, *context;
615:
616: (void)scope;
617: (void)flags;
618: (void)valid;
619: (void)preferred;
620:
621: struct cparam *param = vparam;
622:
623: if (IN6_IS_ADDR_LOOPBACK(local) ||
624: IN6_IS_ADDR_LINKLOCAL(local) ||
625: IN6_IS_ADDR_MULTICAST(local))
626: return 1;
627:
628: if (!(flags & IFACE_PERMANENT))
629: return 1;
630:
631: if (flags & IFACE_DEPRECATED)
632: return 1;
633:
634: if (!indextoname(daemon->icmp6fd, if_index, ifrn_name))
635: return 0;
636:
637: for (template = daemon->dhcp6; template; template = template->next)
638: if (!(template->flags & CONTEXT_TEMPLATE))
639: {
640: /* non-template entries, just fill in interface and local addresses */
641: if (prefix <= template->prefix &&
642: is_same_net6(local, &template->start6, template->prefix) &&
643: is_same_net6(local, &template->end6, template->prefix))
644: {
645: template->if_index = if_index;
646: template->local6 = *local;
647: }
648:
649: }
650: else if (wildcard_match(template->template_interface, ifrn_name) &&
651: template->prefix >= prefix)
652: {
653: start6 = *local;
654: setaddr6part(&start6, addr6part(&template->start6));
655: end6 = *local;
656: setaddr6part(&end6, addr6part(&template->end6));
657:
658: for (context = daemon->dhcp6; context; context = context->next)
659: if ((context->flags & CONTEXT_CONSTRUCTED) &&
660: IN6_ARE_ADDR_EQUAL(&start6, &context->start6) &&
661: IN6_ARE_ADDR_EQUAL(&end6, &context->end6))
662: {
663: int flags = context->flags;
664: context->flags &= ~(CONTEXT_GC | CONTEXT_OLD);
665: if (flags & CONTEXT_OLD)
666: {
667: /* address went, now it's back */
668: log_context(AF_INET6, context);
669: /* fast RAs for a while */
670: ra_start_unsolicted(param->now, context);
671: param->newone = 1;
672: /* Add address to name again */
673: if (context->flags & CONTEXT_RA_NAME)
674: param->newname = 1;
675: }
676: break;
677: }
678:
679: if (!context && (context = whine_malloc(sizeof (struct dhcp_context))))
680: {
681: *context = *template;
682: context->start6 = start6;
683: context->end6 = end6;
684: context->flags &= ~CONTEXT_TEMPLATE;
685: context->flags |= CONTEXT_CONSTRUCTED;
686: context->if_index = if_index;
687: context->local6 = *local;
688: context->saved_valid = 0;
689:
690: context->next = daemon->dhcp6;
691: daemon->dhcp6 = context;
692:
693: ra_start_unsolicted(param->now, context);
694: /* we created a new one, need to call
695: lease_update_file to get periodic functions called */
696: param->newone = 1;
697:
698: /* Will need to add new putative SLAAC addresses to existing leases */
699: if (context->flags & CONTEXT_RA_NAME)
700: param->newname = 1;
701:
702: log_context(AF_INET6, context);
703: }
704: }
705:
706: return 1;
707: }
708:
709: void dhcp_construct_contexts(time_t now)
710: {
711: struct dhcp_context *context, *tmp, **up;
712: struct cparam param;
713: param.newone = 0;
714: param.newname = 0;
715: param.now = now;
716:
717: for (context = daemon->dhcp6; context; context = context->next)
718: if (context->flags & CONTEXT_CONSTRUCTED)
719: context->flags |= CONTEXT_GC;
720:
721: iface_enumerate(AF_INET6, ¶m, construct_worker);
722:
723: for (up = &daemon->dhcp6, context = daemon->dhcp6; context; context = tmp)
724: {
725:
726: tmp = context->next;
727:
728: if (context->flags & CONTEXT_GC && !(context->flags & CONTEXT_OLD))
729: {
730: if ((context->flags & (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS)) ||
731: option_bool(OPT_RA))
732: {
733: /* previously constructed context has gone. advertise it's demise */
734: context->flags |= CONTEXT_OLD;
735: context->address_lost_time = now;
736: /* Apply same ceiling of configured lease time as in radv.c */
737: if (context->saved_valid > context->lease_time)
738: context->saved_valid = context->lease_time;
739: /* maximum time is 2 hours, from RFC */
740: if (context->saved_valid > 7200) /* 2 hours */
741: context->saved_valid = 7200;
742: ra_start_unsolicted(now, context);
743: param.newone = 1; /* include deletion */
744:
745: if (context->flags & CONTEXT_RA_NAME)
746: param.newname = 1;
747:
748: log_context(AF_INET6, context);
749:
750: up = &context->next;
751: }
752: else
753: {
754: /* we were never doing RA for this, so free now */
755: *up = context->next;
756: free(context);
757: }
758: }
759: else
760: up = &context->next;
761: }
762:
763: if (param.newone)
764: {
765: if (daemon->dhcp || daemon->doing_dhcp6)
766: {
767: if (param.newname)
768: lease_update_slaac(now);
769: lease_update_file(now);
770: }
771: else
772: /* Not doing DHCP, so no lease system, manage alarms for ra only */
773: send_alarm(periodic_ra(now), now);
774: }
775: }
776:
777: #endif
778:
779:
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