Annotation of embedaddon/dnsmasq/src/dhcp6.c, revision 1.1.1.3
1.1.1.3 ! misho 1: /* dnsmasq is Copyright (c) 2000-2016 Simon Kelley
1.1 misho 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:
1.1.1.2 misho 21: #include <netinet/icmp6.h>
22:
1.1 misho 23: struct iface_param {
24: struct dhcp_context *current;
1.1.1.2 misho 25: struct dhcp_relay *relay;
26: struct in6_addr fallback, relay_local, ll_addr, ula_addr;
1.1 misho 27: int ind, addr_match;
28: };
29:
1.1.1.2 misho 30:
1.1 misho 31: static int complete_context6(struct in6_addr *local, int prefix,
32: int scope, int if_index, int flags,
33: unsigned int preferred, unsigned int valid, void *vparam);
34: static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm);
35:
36: void dhcp6_init(void)
37: {
38: int fd;
39: struct sockaddr_in6 saddr;
40: #if defined(IPV6_TCLASS) && defined(IPTOS_CLASS_CS6)
41: int class = IPTOS_CLASS_CS6;
42: #endif
43: int oneopt = 1;
44:
45: if ((fd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP)) == -1 ||
46: #if defined(IPV6_TCLASS) && defined(IPTOS_CLASS_CS6)
47: setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &class, sizeof(class)) == -1 ||
48: #endif
49: setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &oneopt, sizeof(oneopt)) == -1 ||
50: !fix_fd(fd) ||
51: !set_ipv6pktinfo(fd))
52: die (_("cannot create DHCPv6 socket: %s"), NULL, EC_BADNET);
53:
54: /* When bind-interfaces is set, there might be more than one dnmsasq
55: instance binding port 547. That's OK if they serve different networks.
56: Need to set REUSEADDR|REUSEPORT to make this posible.
57: Handle the case that REUSEPORT is defined, but the kernel doesn't
58: support it. This handles the introduction of REUSEPORT on Linux. */
59: if (option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND))
60: {
1.1.1.2 misho 61: int rc = 0;
1.1 misho 62:
63: #ifdef SO_REUSEPORT
64: if ((rc = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &oneopt, sizeof(oneopt))) == -1 &&
1.1.1.2 misho 65: errno == ENOPROTOOPT)
66: rc = 0;
1.1 misho 67: #endif
68:
1.1.1.2 misho 69: if (rc != -1)
1.1 misho 70: rc = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &oneopt, sizeof(oneopt));
71:
72: if (rc == -1)
73: die(_("failed to set SO_REUSE{ADDR|PORT} on DHCPv6 socket: %s"), NULL, EC_BADNET);
74: }
75:
76: memset(&saddr, 0, sizeof(saddr));
77: #ifdef HAVE_SOCKADDR_SA_LEN
78: saddr.sin6_len = sizeof(struct sockaddr_in6);
79: #endif
80: saddr.sin6_family = AF_INET6;
81: saddr.sin6_addr = in6addr_any;
82: saddr.sin6_port = htons(DHCPV6_SERVER_PORT);
83:
84: if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in6)))
85: die(_("failed to bind DHCPv6 server socket: %s"), NULL, EC_BADNET);
86:
87: daemon->dhcp6fd = fd;
88: }
89:
90: void dhcp6_packet(time_t now)
91: {
92: struct dhcp_context *context;
1.1.1.2 misho 93: struct dhcp_relay *relay;
1.1 misho 94: struct iface_param parm;
95: struct cmsghdr *cmptr;
96: struct msghdr msg;
97: int if_index = 0;
98: union {
99: struct cmsghdr align; /* this ensures alignment */
100: char control6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
101: } control_u;
102: struct sockaddr_in6 from;
103: ssize_t sz;
104: struct ifreq ifr;
105: struct iname *tmp;
106: unsigned short port;
1.1.1.2 misho 107: struct in6_addr dst_addr;
108:
109: memset(&dst_addr, 0, sizeof(dst_addr));
1.1 misho 110:
111: msg.msg_control = control_u.control6;
112: msg.msg_controllen = sizeof(control_u);
113: msg.msg_flags = 0;
114: msg.msg_name = &from;
115: msg.msg_namelen = sizeof(from);
116: msg.msg_iov = &daemon->dhcp_packet;
117: msg.msg_iovlen = 1;
118:
119: if ((sz = recv_dhcp_packet(daemon->dhcp6fd, &msg)) == -1)
120: return;
121:
122: for (cmptr = CMSG_FIRSTHDR(&msg); cmptr; cmptr = CMSG_NXTHDR(&msg, cmptr))
123: if (cmptr->cmsg_level == IPPROTO_IPV6 && cmptr->cmsg_type == daemon->v6pktinfo)
124: {
125: union {
126: unsigned char *c;
127: struct in6_pktinfo *p;
128: } p;
129: p.c = CMSG_DATA(cmptr);
130:
131: if_index = p.p->ipi6_ifindex;
1.1.1.2 misho 132: dst_addr = p.p->ipi6_addr;
1.1 misho 133: }
134:
135: if (!indextoname(daemon->dhcp6fd, if_index, ifr.ifr_name))
136: return;
137:
1.1.1.2 misho 138: if ((port = relay_reply6(&from, sz, ifr.ifr_name)) == 0)
1.1 misho 139: {
1.1.1.3 ! misho 140: struct dhcp_bridge *bridge, *alias;
! 141:
1.1.1.2 misho 142: for (tmp = daemon->if_except; tmp; tmp = tmp->next)
143: if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name))
144: return;
1.1 misho 145:
1.1.1.2 misho 146: for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
1.1 misho 147: if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name))
1.1.1.2 misho 148: return;
149:
150: parm.current = NULL;
151: parm.relay = NULL;
152: memset(&parm.relay_local, 0, IN6ADDRSZ);
153: parm.ind = if_index;
154: parm.addr_match = 0;
155: memset(&parm.fallback, 0, IN6ADDRSZ);
156: memset(&parm.ll_addr, 0, IN6ADDRSZ);
157: memset(&parm.ula_addr, 0, IN6ADDRSZ);
1.1.1.3 ! misho 158:
! 159: /* If the interface on which the DHCPv6 request was received is
! 160: an alias of some other interface (as specified by the
! 161: --bridge-interface option), change parm.ind so that we look
! 162: for DHCPv6 contexts associated with the aliased interface
! 163: instead of with the aliasing one. */
! 164: for (bridge = daemon->bridges; bridge; bridge = bridge->next)
! 165: {
! 166: for (alias = bridge->alias; alias; alias = alias->next)
! 167: if (wildcard_matchn(alias->iface, ifr.ifr_name, IF_NAMESIZE))
! 168: {
! 169: parm.ind = if_nametoindex(bridge->iface);
! 170: if (!parm.ind)
! 171: {
! 172: my_syslog(MS_DHCP | LOG_WARNING,
! 173: _("unknown interface %s in bridge-interface"),
! 174: bridge->iface);
! 175: return;
! 176: }
! 177: break;
! 178: }
! 179: if (alias)
! 180: break;
! 181: }
1.1.1.2 misho 182:
183: for (context = daemon->dhcp6; context; context = context->next)
184: if (IN6_IS_ADDR_UNSPECIFIED(&context->start6) && context->prefix == 0)
185: {
186: /* wildcard context for DHCP-stateless only */
187: parm.current = context;
188: context->current = NULL;
189: }
190: else
191: {
192: /* unlinked contexts are marked by context->current == context */
193: context->current = context;
194: memset(&context->local6, 0, IN6ADDRSZ);
195: }
1.1 misho 196:
1.1.1.2 misho 197: for (relay = daemon->relay6; relay; relay = relay->next)
198: relay->current = relay;
199:
200: if (!iface_enumerate(AF_INET6, &parm, complete_context6))
1.1 misho 201: return;
202:
1.1.1.2 misho 203: if (daemon->if_names || daemon->if_addrs)
204: {
205:
206: for (tmp = daemon->if_names; tmp; tmp = tmp->next)
207: if (tmp->name && wildcard_match(tmp->name, ifr.ifr_name))
208: break;
209:
210: if (!tmp && !parm.addr_match)
211: return;
212: }
213:
214: if (parm.relay)
215: {
216: /* Ignore requests sent to the ALL_SERVERS multicast address for relay when
217: we're listening there for DHCPv6 server reasons. */
218: struct in6_addr all_servers;
219:
220: inet_pton(AF_INET6, ALL_SERVERS, &all_servers);
221:
222: if (!IN6_ARE_ADDR_EQUAL(&dst_addr, &all_servers))
1.1.1.3 ! misho 223: relay_upstream6(parm.relay, sz, &from.sin6_addr, from.sin6_scope_id, now);
1.1.1.2 misho 224: return;
225: }
226:
227: /* May have configured relay, but not DHCP server */
228: if (!daemon->doing_dhcp6)
229: return;
1.1.1.3 ! misho 230:
1.1.1.2 misho 231: lease_prune(NULL, now); /* lose any expired leases */
232:
233: port = dhcp6_reply(parm.current, if_index, ifr.ifr_name, &parm.fallback,
234: &parm.ll_addr, &parm.ula_addr, sz, &from.sin6_addr, now);
235:
236: lease_update_file(now);
237: lease_update_dns(0);
238: }
239:
1.1 misho 240: /* The port in the source address of the original request should
241: be correct, but at least once client sends from the server port,
242: so we explicitly send to the client port to a client, and the
243: server port to a relay. */
244: if (port != 0)
245: {
246: from.sin6_port = htons(port);
1.1.1.3 ! misho 247: while (retry_send(sendto(daemon->dhcp6fd, daemon->outpacket.iov_base,
! 248: save_counter(0), 0, (struct sockaddr *)&from,
! 249: sizeof(from))));
1.1 misho 250: }
251: }
252:
1.1.1.3 ! misho 253: void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac, unsigned int *maclenp, unsigned int *mactypep, time_t now)
1.1.1.2 misho 254: {
255: /* Recieving a packet from a host does not populate the neighbour
256: cache, so we send a neighbour discovery request if we can't
257: find the sender. Repeat a few times in case of packet loss. */
258:
259: struct neigh_packet neigh;
1.1.1.3 ! misho 260: union mysockaddr addr;
! 261: int i, maclen;
1.1.1.2 misho 262:
263: neigh.type = ND_NEIGHBOR_SOLICIT;
264: neigh.code = 0;
265: neigh.reserved = 0;
266: neigh.target = *client;
1.1.1.3 ! misho 267: /* RFC4443 section-2.3: checksum has to be zero to be calculated */
! 268: neigh.checksum = 0;
! 269:
1.1.1.2 misho 270: memset(&addr, 0, sizeof(addr));
271: #ifdef HAVE_SOCKADDR_SA_LEN
1.1.1.3 ! misho 272: addr.in6.sin6_len = sizeof(struct sockaddr_in6);
1.1.1.2 misho 273: #endif
1.1.1.3 ! misho 274: addr.in6.sin6_family = AF_INET6;
! 275: addr.in6.sin6_port = htons(IPPROTO_ICMPV6);
! 276: addr.in6.sin6_addr = *client;
! 277: addr.in6.sin6_scope_id = iface;
1.1.1.2 misho 278:
279: for (i = 0; i < 5; i++)
280: {
281: struct timespec ts;
282:
1.1.1.3 ! misho 283: if ((maclen = find_mac(&addr, mac, 0, now)) != 0)
1.1.1.2 misho 284: break;
1.1.1.3 ! misho 285:
! 286: sendto(daemon->icmp6fd, &neigh, sizeof(neigh), 0, &addr.sa, sizeof(addr));
1.1.1.2 misho 287:
288: ts.tv_sec = 0;
289: ts.tv_nsec = 100000000; /* 100ms */
290: nanosleep(&ts, NULL);
291: }
292:
1.1.1.3 ! misho 293: *maclenp = maclen;
1.1.1.2 misho 294: *mactypep = ARPHRD_ETHER;
295: }
296:
1.1 misho 297: static int complete_context6(struct in6_addr *local, int prefix,
298: int scope, int if_index, int flags, unsigned int preferred,
299: unsigned int valid, void *vparam)
300: {
301: struct dhcp_context *context;
1.1.1.2 misho 302: struct dhcp_relay *relay;
1.1 misho 303: struct iface_param *param = vparam;
304: struct iname *tmp;
305:
306: (void)scope; /* warning */
307:
1.1.1.2 misho 308: if (if_index == param->ind)
309: {
310: if (IN6_IS_ADDR_LINKLOCAL(local))
311: param->ll_addr = *local;
312: else if (IN6_IS_ADDR_ULA(local))
313: param->ula_addr = *local;
314:
315: if (!IN6_IS_ADDR_LOOPBACK(local) &&
316: !IN6_IS_ADDR_LINKLOCAL(local) &&
317: !IN6_IS_ADDR_MULTICAST(local))
1.1 misho 318: {
1.1.1.2 misho 319: /* if we have --listen-address config, see if the
320: arrival interface has a matching address. */
321: for (tmp = daemon->if_addrs; tmp; tmp = tmp->next)
322: if (tmp->addr.sa.sa_family == AF_INET6 &&
323: IN6_ARE_ADDR_EQUAL(&tmp->addr.in6.sin6_addr, local))
324: param->addr_match = 1;
325:
326: /* Determine a globally address on the arrival interface, even
327: if we have no matching dhcp-context, because we're only
328: allocating on remote subnets via relays. This
329: is used as a default for the DNS server option. */
330: param->fallback = *local;
331:
332: for (context = daemon->dhcp6; context; context = context->next)
1.1 misho 333: {
1.1.1.2 misho 334: if ((context->flags & CONTEXT_DHCP) &&
335: !(context->flags & (CONTEXT_TEMPLATE | CONTEXT_OLD)) &&
336: prefix <= context->prefix &&
337: is_same_net6(local, &context->start6, context->prefix) &&
338: is_same_net6(local, &context->end6, context->prefix))
1.1 misho 339: {
340:
341:
1.1.1.2 misho 342: /* link it onto the current chain if we've not seen it before */
343: if (context->current == context)
344: {
345: struct dhcp_context *tmp, **up;
346:
347: /* use interface values only for contructed contexts */
348: if (!(context->flags & CONTEXT_CONSTRUCTED))
349: preferred = valid = 0xffffffff;
350: else if (flags & IFACE_DEPRECATED)
351: preferred = 0;
352:
353: if (context->flags & CONTEXT_DEPRECATE)
354: preferred = 0;
355:
356: /* order chain, longest preferred time first */
357: for (up = ¶m->current, tmp = param->current; tmp; tmp = tmp->current)
358: if (tmp->preferred <= preferred)
359: break;
360: else
361: up = &tmp->current;
362:
363: context->current = *up;
364: *up = context;
365: context->local6 = *local;
366: context->preferred = preferred;
367: context->valid = valid;
368: }
1.1 misho 369: }
370: }
371: }
1.1.1.2 misho 372:
373: for (relay = daemon->relay6; relay; relay = relay->next)
374: if (IN6_ARE_ADDR_EQUAL(local, &relay->local.addr.addr6) && relay->current == relay &&
375: (IN6_IS_ADDR_UNSPECIFIED(¶m->relay_local) || IN6_ARE_ADDR_EQUAL(local, ¶m->relay_local)))
376: {
377: relay->current = param->relay;
378: param->relay = relay;
379: param->relay_local = *local;
380: }
381:
1.1 misho 382: }
1.1.1.2 misho 383:
384: return 1;
1.1 misho 385: }
386:
387: struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net, int prefix, u64 addr)
388: {
389: struct dhcp_config *config;
390:
391: for (config = configs; config; config = config->next)
392: if ((config->flags & CONFIG_ADDR6) &&
393: is_same_net6(&config->addr6, net, prefix) &&
394: (prefix == 128 || addr6part(&config->addr6) == addr))
395: return config;
396:
397: return NULL;
398: }
399:
1.1.1.2 misho 400: struct dhcp_context *address6_allocate(struct dhcp_context *context, unsigned char *clid, int clid_len, int temp_addr,
1.1 misho 401: int iaid, int serial, struct dhcp_netid *netids, int plain_range, struct in6_addr *ans)
402: {
403: /* Find a free address: exclude anything in use and anything allocated to
404: a particular hwaddr/clientid/hostname in our configuration.
405: Try to return from contexts which match netids first.
406:
407: Note that we assume the address prefix lengths are 64 or greater, so we can
408: get by with 64 bit arithmetic.
409: */
410:
411: u64 start, addr;
412: struct dhcp_context *c, *d;
413: int i, pass;
414: u64 j;
415:
416: /* hash hwaddr: use the SDBM hashing algorithm. This works
1.1.1.2 misho 417: for MAC addresses, let's see how it manages with client-ids!
418: For temporary addresses, we generate a new random one each time. */
419: if (temp_addr)
420: j = rand64();
421: else
422: for (j = iaid, i = 0; i < clid_len; i++)
1.1.1.3 ! misho 423: j = clid[i] + (j << 6) + (j << 16) - j;
1.1 misho 424:
425: for (pass = 0; pass <= plain_range ? 1 : 0; pass++)
426: for (c = context; c; c = c->current)
427: if (c->flags & (CONTEXT_DEPRECATE | CONTEXT_STATIC | CONTEXT_RA_STATELESS | CONTEXT_USED))
428: continue;
429: else if (!match_netid(c->filter, netids, pass))
430: continue;
431: else
432: {
1.1.1.2 misho 433: if (!temp_addr && option_bool(OPT_CONSEC_ADDR))
1.1 misho 434: /* seed is largest extant lease addr in this context */
435: start = lease_find_max_addr6(c) + serial;
436: else
1.1.1.3 ! misho 437: {
! 438: u64 range = 1 + addr6part(&c->end6) - addr6part(&c->start6);
! 439: u64 offset = j + c->addr_epoch;
! 440:
! 441: /* don't divide by zero if range is whole 2^64 */
! 442: if (range != 0)
! 443: offset = offset % range;
! 444:
! 445: start = addr6part(&c->start6) + offset;
! 446: }
1.1 misho 447:
448: /* iterate until we find a free address. */
449: addr = start;
450:
451: do {
452: /* eliminate addresses in use by the server. */
453: for (d = context; d; d = d->current)
454: if (addr == addr6part(&d->local6))
455: break;
456:
457: if (!d &&
458: !lease6_find_by_addr(&c->start6, c->prefix, addr) &&
459: !config_find_by_address6(daemon->dhcp_conf, &c->start6, c->prefix, addr))
460: {
461: *ans = c->start6;
462: setaddr6part (ans, addr);
463: return c;
464: }
465:
466: addr++;
467:
468: if (addr == addr6part(&c->end6) + 1)
469: addr = addr6part(&c->start6);
470:
471: } while (addr != start);
472: }
473:
474: return NULL;
475: }
476:
477: /* can dynamically allocate addr */
478: struct dhcp_context *address6_available(struct dhcp_context *context,
479: struct in6_addr *taddr,
480: struct dhcp_netid *netids,
481: int plain_range)
482: {
483: u64 start, end, addr = addr6part(taddr);
484: struct dhcp_context *tmp;
485:
486: for (tmp = context; tmp; tmp = tmp->current)
487: {
488: start = addr6part(&tmp->start6);
489: end = addr6part(&tmp->end6);
490:
491: if (!(tmp->flags & (CONTEXT_STATIC | CONTEXT_RA_STATELESS)) &&
492: is_same_net6(&tmp->start6, taddr, tmp->prefix) &&
493: is_same_net6(&tmp->end6, taddr, tmp->prefix) &&
494: addr >= start &&
495: addr <= end &&
496: match_netid(tmp->filter, netids, plain_range))
497: return tmp;
498: }
499:
500: return NULL;
501: }
502:
503: /* address OK if configured */
504: struct dhcp_context *address6_valid(struct dhcp_context *context,
505: struct in6_addr *taddr,
506: struct dhcp_netid *netids,
507: int plain_range)
508: {
509: struct dhcp_context *tmp;
510:
511: for (tmp = context; tmp; tmp = tmp->current)
512: if (is_same_net6(&tmp->start6, taddr, tmp->prefix) &&
513: match_netid(tmp->filter, netids, plain_range))
514: return tmp;
515:
516: return NULL;
517: }
518:
519: int config_valid(struct dhcp_config *config, struct dhcp_context *context, struct in6_addr *addr)
520: {
521: if (!config || !(config->flags & CONFIG_ADDR6))
522: return 0;
523:
524: if ((config->flags & CONFIG_WILDCARD) && context->prefix == 64)
525: {
526: *addr = context->start6;
527: setaddr6part(addr, addr6part(&config->addr6));
528: return 1;
529: }
530:
531: if (is_same_net6(&context->start6, &config->addr6, context->prefix))
532: {
533: *addr = config->addr6;
534: return 1;
535: }
536:
537: return 0;
538: }
539:
540: void make_duid(time_t now)
541: {
1.1.1.2 misho 542: (void)now;
543:
1.1 misho 544: if (daemon->duid_config)
545: {
546: unsigned char *p;
547:
548: daemon->duid = p = safe_malloc(daemon->duid_config_len + 6);
549: daemon->duid_len = daemon->duid_config_len + 6;
550: PUTSHORT(2, p); /* DUID_EN */
551: PUTLONG(daemon->duid_enterprise, p);
552: memcpy(p, daemon->duid_config, daemon->duid_config_len);
553: }
554: else
555: {
1.1.1.2 misho 556: time_t newnow = 0;
557:
558: /* If we have no persistent lease database, or a non-stable RTC, use DUID_LL (newnow == 0) */
559: #ifndef HAVE_BROKEN_RTC
1.1 misho 560: /* rebase epoch to 1/1/2000 */
1.1.1.2 misho 561: if (!option_bool(OPT_LEASE_RO) || daemon->lease_change_command)
562: newnow = now - 946684800;
563: #endif
1.1 misho 564:
565: iface_enumerate(AF_LOCAL, &newnow, make_duid1);
566:
567: if(!daemon->duid)
568: die("Cannot create DHCPv6 server DUID: %s", NULL, EC_MISC);
569: }
570: }
571:
572: static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm)
573: {
574: /* create DUID as specified in RFC3315. We use the MAC of the
575: first interface we find that isn't loopback or P-to-P and
576: has address-type < 256. Address types above 256 are things like
577: tunnels which don't have usable MAC addresses. */
578:
579: unsigned char *p;
580: (void)index;
1.1.1.2 misho 581: (void)parm;
582: time_t newnow = *((time_t *)parm);
583:
1.1 misho 584: if (type >= 256)
585: return 1;
586:
1.1.1.2 misho 587: if (newnow == 0)
588: {
589: daemon->duid = p = safe_malloc(maclen + 4);
590: daemon->duid_len = maclen + 4;
591: PUTSHORT(3, p); /* DUID_LL */
592: PUTSHORT(type, p); /* address type */
593: }
594: else
595: {
596: daemon->duid = p = safe_malloc(maclen + 8);
597: daemon->duid_len = maclen + 8;
598: PUTSHORT(1, p); /* DUID_LLT */
599: PUTSHORT(type, p); /* address type */
600: PUTLONG(*((time_t *)parm), p); /* time */
601: }
602:
1.1 misho 603: memcpy(p, mac, maclen);
604:
605: return 0;
606: }
607:
608: struct cparam {
609: time_t now;
610: int newone, newname;
611: };
612:
613: static int construct_worker(struct in6_addr *local, int prefix,
614: int scope, int if_index, int flags,
615: int preferred, int valid, void *vparam)
616: {
617: char ifrn_name[IFNAMSIZ];
618: struct in6_addr start6, end6;
619: struct dhcp_context *template, *context;
620:
621: (void)scope;
622: (void)flags;
623: (void)valid;
624: (void)preferred;
625:
626: struct cparam *param = vparam;
627:
628: if (IN6_IS_ADDR_LOOPBACK(local) ||
629: IN6_IS_ADDR_LINKLOCAL(local) ||
630: IN6_IS_ADDR_MULTICAST(local))
631: return 1;
632:
1.1.1.2 misho 633: if (!(flags & IFACE_PERMANENT))
634: return 1;
635:
636: if (flags & IFACE_DEPRECATED)
637: return 1;
638:
639: if (!indextoname(daemon->icmp6fd, if_index, ifrn_name))
1.1 misho 640: return 0;
641:
642: for (template = daemon->dhcp6; template; template = template->next)
643: if (!(template->flags & CONTEXT_TEMPLATE))
644: {
645: /* non-template entries, just fill in interface and local addresses */
1.1.1.2 misho 646: if (prefix <= template->prefix &&
647: is_same_net6(local, &template->start6, template->prefix) &&
648: is_same_net6(local, &template->end6, template->prefix))
1.1 misho 649: {
650: template->if_index = if_index;
651: template->local6 = *local;
652: }
653:
654: }
1.1.1.2 misho 655: else if (wildcard_match(template->template_interface, ifrn_name) &&
656: template->prefix >= prefix)
1.1 misho 657: {
658: start6 = *local;
659: setaddr6part(&start6, addr6part(&template->start6));
660: end6 = *local;
661: setaddr6part(&end6, addr6part(&template->end6));
662:
663: for (context = daemon->dhcp6; context; context = context->next)
664: if ((context->flags & CONTEXT_CONSTRUCTED) &&
665: IN6_ARE_ADDR_EQUAL(&start6, &context->start6) &&
666: IN6_ARE_ADDR_EQUAL(&end6, &context->end6))
667: {
1.1.1.2 misho 668: int flags = context->flags;
669: context->flags &= ~(CONTEXT_GC | CONTEXT_OLD);
670: if (flags & CONTEXT_OLD)
671: {
672: /* address went, now it's back */
673: log_context(AF_INET6, context);
674: /* fast RAs for a while */
675: ra_start_unsolicted(param->now, context);
676: param->newone = 1;
677: /* Add address to name again */
678: if (context->flags & CONTEXT_RA_NAME)
679: param->newname = 1;
680: }
1.1 misho 681: break;
682: }
683:
684: if (!context && (context = whine_malloc(sizeof (struct dhcp_context))))
685: {
686: *context = *template;
687: context->start6 = start6;
688: context->end6 = end6;
689: context->flags &= ~CONTEXT_TEMPLATE;
690: context->flags |= CONTEXT_CONSTRUCTED;
691: context->if_index = if_index;
692: context->local6 = *local;
1.1.1.2 misho 693: context->saved_valid = 0;
1.1 misho 694:
695: context->next = daemon->dhcp6;
696: daemon->dhcp6 = context;
697:
698: ra_start_unsolicted(param->now, context);
699: /* we created a new one, need to call
700: lease_update_file to get periodic functions called */
701: param->newone = 1;
702:
703: /* Will need to add new putative SLAAC addresses to existing leases */
704: if (context->flags & CONTEXT_RA_NAME)
705: param->newname = 1;
706:
707: log_context(AF_INET6, context);
708: }
709: }
710:
711: return 1;
712: }
713:
714: void dhcp_construct_contexts(time_t now)
715: {
1.1.1.2 misho 716: struct dhcp_context *context, *tmp, **up;
1.1 misho 717: struct cparam param;
718: param.newone = 0;
719: param.newname = 0;
720: param.now = now;
721:
722: for (context = daemon->dhcp6; context; context = context->next)
1.1.1.2 misho 723: if (context->flags & CONTEXT_CONSTRUCTED)
724: context->flags |= CONTEXT_GC;
725:
1.1 misho 726: iface_enumerate(AF_INET6, ¶m, construct_worker);
727:
728: for (up = &daemon->dhcp6, context = daemon->dhcp6; context; context = tmp)
729: {
730:
1.1.1.2 misho 731: tmp = context->next;
732:
733: if (context->flags & CONTEXT_GC && !(context->flags & CONTEXT_OLD))
1.1 misho 734: {
1.1.1.3 ! misho 735: if ((context->flags & CONTEXT_RA) || option_bool(OPT_RA))
1.1.1.2 misho 736: {
737: /* previously constructed context has gone. advertise it's demise */
738: context->flags |= CONTEXT_OLD;
739: context->address_lost_time = now;
740: /* Apply same ceiling of configured lease time as in radv.c */
741: if (context->saved_valid > context->lease_time)
742: context->saved_valid = context->lease_time;
743: /* maximum time is 2 hours, from RFC */
744: if (context->saved_valid > 7200) /* 2 hours */
745: context->saved_valid = 7200;
746: ra_start_unsolicted(now, context);
747: param.newone = 1; /* include deletion */
748:
749: if (context->flags & CONTEXT_RA_NAME)
750: param.newname = 1;
751:
752: log_context(AF_INET6, context);
753:
754: up = &context->next;
755: }
756: else
757: {
758: /* we were never doing RA for this, so free now */
759: *up = context->next;
760: free(context);
761: }
1.1 misho 762: }
763: else
1.1.1.2 misho 764: up = &context->next;
1.1 misho 765: }
766:
767: if (param.newone)
768: {
769: if (daemon->dhcp || daemon->doing_dhcp6)
770: {
771: if (param.newname)
772: lease_update_slaac(now);
773: lease_update_file(now);
774: }
775: else
776: /* Not doing DHCP, so no lease system, manage alarms for ra only */
777: send_alarm(periodic_ra(now), now);
778: }
779: }
780:
781: #endif
782:
783:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to dhcp6.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / dnsmasq / src