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04473969 PF |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2017 Intel Corporation. All rights reserved. | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <netinet/icmp6.h> | |
21 | #include <netinet/in.h> | |
204f99d2 | 22 | #include <arpa/inet.h> |
77baf5ae | 23 | #include <linux/in6.h> |
04473969 PF |
24 | |
25 | #include "sd-radv.h" | |
26 | ||
204f99d2 | 27 | #include "macro.h" |
04473969 | 28 | #include "alloc-util.h" |
e965d6ab | 29 | #include "dns-domain.h" |
04473969 PF |
30 | #include "fd-util.h" |
31 | #include "icmp6-util.h" | |
32 | #include "in-addr-util.h" | |
33 | #include "radv-internal.h" | |
34 | #include "socket-util.h" | |
35 | #include "string-util.h" | |
e965d6ab | 36 | #include "strv.h" |
04473969 | 37 | #include "util.h" |
204fb681 | 38 | #include "random-util.h" |
04473969 | 39 | |
204f99d2 PF |
40 | _public_ int sd_radv_new(sd_radv **ret) { |
41 | _cleanup_(sd_radv_unrefp) sd_radv *ra = NULL; | |
42 | ||
43 | assert_return(ret, -EINVAL); | |
44 | ||
45 | ra = new0(sd_radv, 1); | |
46 | if (!ra) | |
47 | return -ENOMEM; | |
48 | ||
49 | ra->n_ref = 1; | |
77baf5ae | 50 | ra->fd = -1; |
204f99d2 PF |
51 | |
52 | LIST_HEAD_INIT(ra->prefixes); | |
53 | ||
54 | *ret = ra; | |
55 | ra = NULL; | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | _public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) { | |
61 | int r; | |
62 | ||
63 | assert_return(ra, -EINVAL); | |
64 | assert_return(!ra->event, -EBUSY); | |
65 | ||
66 | if (event) | |
67 | ra->event = sd_event_ref(event); | |
68 | else { | |
69 | r = sd_event_default(&ra->event); | |
70 | if (r < 0) | |
71 | return 0; | |
72 | } | |
73 | ||
74 | ra->event_priority = priority; | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | _public_ int sd_radv_detach_event(sd_radv *ra) { | |
80 | ||
81 | assert_return(ra, -EINVAL); | |
82 | ||
83 | ra->event = sd_event_unref(ra->event); | |
84 | return 0; | |
85 | } | |
86 | ||
87 | _public_ sd_event *sd_radv_get_event(sd_radv *ra) { | |
88 | assert_return(ra, NULL); | |
89 | ||
90 | return ra->event; | |
91 | } | |
92 | ||
204fb681 PF |
93 | static void radv_reset(sd_radv *ra) { |
94 | ||
95 | ra->timeout_event_source = | |
96 | sd_event_source_unref(ra->timeout_event_source); | |
97 | ||
88d5a3db PF |
98 | ra->recv_event_source = |
99 | sd_event_source_unref(ra->recv_event_source); | |
100 | ||
204fb681 PF |
101 | ra->ra_sent = 0; |
102 | } | |
103 | ||
204f99d2 PF |
104 | _public_ sd_radv *sd_radv_ref(sd_radv *ra) { |
105 | if (!ra) | |
106 | return NULL; | |
107 | ||
108 | assert(ra->n_ref > 0); | |
109 | ra->n_ref++; | |
110 | ||
111 | return ra; | |
112 | } | |
113 | ||
114 | _public_ sd_radv *sd_radv_unref(sd_radv *ra) { | |
115 | if (!ra) | |
116 | return NULL; | |
117 | ||
118 | assert(ra->n_ref > 0); | |
119 | ra->n_ref--; | |
120 | ||
121 | if (ra->n_ref > 0) | |
122 | return NULL; | |
123 | ||
124 | while (ra->prefixes) { | |
125 | sd_radv_prefix *p = ra->prefixes; | |
126 | ||
127 | LIST_REMOVE(prefix, ra->prefixes, p); | |
128 | sd_radv_prefix_unref(p); | |
129 | } | |
130 | ||
e9c6da38 | 131 | free(ra->rdnss); |
f9aa5417 | 132 | free(ra->dnssl); |
e9c6da38 | 133 | |
204fb681 PF |
134 | radv_reset(ra); |
135 | ||
204f99d2 PF |
136 | sd_radv_detach_event(ra); |
137 | return mfree(ra); | |
138 | } | |
139 | ||
204fb681 PF |
140 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, |
141 | const uint32_t router_lifetime) { | |
77baf5ae PF |
142 | static const struct ether_addr mac_zero = {}; |
143 | sd_radv_prefix *p; | |
144 | struct sockaddr_in6 dst_addr = { | |
145 | .sin6_family = AF_INET6, | |
146 | .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
147 | }; | |
148 | struct nd_router_advert adv = {}; | |
149 | struct { | |
150 | struct nd_opt_hdr opthdr; | |
151 | struct ether_addr slladdr; | |
152 | } _packed_ opt_mac = { | |
153 | .opthdr = { | |
154 | .nd_opt_type = ND_OPT_SOURCE_LINKADDR, | |
155 | .nd_opt_len = (sizeof(struct nd_opt_hdr) + | |
156 | sizeof(struct ether_addr) - 1) /8 + 1, | |
157 | }, | |
158 | }; | |
159 | struct nd_opt_mtu opt_mtu = { | |
160 | .nd_opt_mtu_type = ND_OPT_MTU, | |
161 | .nd_opt_mtu_len = 1, | |
162 | }; | |
6852c0f6 PF |
163 | /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, RDNSS |
164 | and DNSSL */ | |
165 | struct iovec iov[5 + ra->n_prefixes]; | |
77baf5ae PF |
166 | struct msghdr msg = { |
167 | .msg_name = &dst_addr, | |
168 | .msg_namelen = sizeof(dst_addr), | |
169 | .msg_iov = iov, | |
170 | }; | |
171 | ||
88d5a3db | 172 | if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst)) |
77baf5ae | 173 | dst_addr.sin6_addr = *dst; |
88d5a3db | 174 | |
77baf5ae PF |
175 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
176 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
177 | adv.nd_ra_flags_reserved = ra->flags; | |
178 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
179 | iov[msg.msg_iovlen].iov_base = &adv; | |
180 | iov[msg.msg_iovlen].iov_len = sizeof(adv); | |
181 | msg.msg_iovlen++; | |
182 | ||
183 | /* MAC address is optional, either because the link does not use L2 | |
184 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
185 | if (memcmp(&mac_zero, &ra->mac_addr, sizeof(mac_zero))) { | |
186 | opt_mac.slladdr = ra->mac_addr; | |
187 | iov[msg.msg_iovlen].iov_base = &opt_mac; | |
188 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mac); | |
189 | msg.msg_iovlen++; | |
190 | } | |
191 | ||
192 | if (ra->mtu) { | |
193 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
194 | iov[msg.msg_iovlen].iov_base = &opt_mtu; | |
195 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu); | |
196 | msg.msg_iovlen++; | |
197 | } | |
198 | ||
199 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
200 | iov[msg.msg_iovlen].iov_base = &p->opt; | |
201 | iov[msg.msg_iovlen].iov_len = sizeof(p->opt); | |
202 | msg.msg_iovlen++; | |
203 | } | |
204 | ||
e9c6da38 PF |
205 | if (ra->rdnss) { |
206 | iov[msg.msg_iovlen].iov_base = ra->rdnss; | |
207 | iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8; | |
208 | msg.msg_iovlen++; | |
209 | } | |
210 | ||
e965d6ab PF |
211 | if (ra->dnssl) { |
212 | iov[msg.msg_iovlen].iov_base = ra->dnssl; | |
213 | iov[msg.msg_iovlen].iov_len = ra->dnssl->length * 8; | |
214 | msg.msg_iovlen++; | |
215 | } | |
216 | ||
77baf5ae PF |
217 | if (sendmsg(ra->fd, &msg, 0) < 0) |
218 | return -errno; | |
204fb681 | 219 | |
77baf5ae | 220 | return 0; |
204fb681 PF |
221 | } |
222 | ||
88d5a3db PF |
223 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
224 | sd_radv *ra = userdata; | |
225 | _cleanup_free_ char *addr = NULL; | |
226 | struct in6_addr src; | |
227 | triple_timestamp timestamp; | |
228 | int r; | |
229 | ssize_t buflen; | |
230 | _cleanup_free_ char *buf = NULL; | |
231 | ||
232 | assert(s); | |
233 | assert(ra); | |
234 | assert(ra->event); | |
235 | ||
236 | buflen = next_datagram_size_fd(fd); | |
237 | ||
238 | if ((unsigned) buflen < sizeof(struct nd_router_solicit)) | |
239 | return log_radv("Too short packet received"); | |
240 | ||
241 | buf = new0(char, buflen); | |
242 | if (!buf) | |
243 | return 0; | |
244 | ||
245 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
246 | if (r < 0) { | |
247 | switch (r) { | |
248 | case -EADDRNOTAVAIL: | |
249 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
250 | log_radv("Received RS from non-link-local address %s. Ignoring", addr); | |
251 | break; | |
252 | ||
253 | case -EMULTIHOP: | |
254 | log_radv("Received RS with invalid hop limit. Ignoring."); | |
255 | break; | |
256 | ||
257 | case -EPFNOSUPPORT: | |
258 | log_radv("Received invalid source address from ICMPv6 socket. Ignoring."); | |
259 | break; | |
260 | ||
261 | default: | |
262 | log_radv_warning_errno(r, "Error receiving from ICMPv6 socket: %m"); | |
263 | break; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
270 | ||
271 | r = radv_send(ra, &src, ra->lifetime); | |
272 | if (r < 0) | |
273 | log_radv_warning_errno(r, "Unable to send solicited Router Advertisment to %s: %m", addr); | |
274 | else | |
275 | log_radv("Sent solicited Router Advertisement to %s", addr); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
204fb681 PF |
280 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
281 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
282 | ||
283 | return min + (random_u32() % (max - min)); | |
284 | } | |
285 | ||
286 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
287 | int r; | |
288 | sd_radv *ra = userdata; | |
289 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
290 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
291 | usec_t time_now, timeout; | |
292 | char time_string[FORMAT_TIMESPAN_MAX]; | |
293 | ||
294 | assert(s); | |
295 | assert(ra); | |
296 | assert(ra->event); | |
297 | ||
298 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); | |
299 | ||
300 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
301 | if (r < 0) | |
302 | goto fail; | |
303 | ||
304 | r = radv_send(ra, NULL, ra->lifetime); | |
305 | if (r < 0) | |
306 | log_radv_warning_errno(r, "Unable to send Router Advertisement: %m"); | |
307 | ||
308 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
309 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
310 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
311 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
312 | } | |
313 | ||
314 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
315 | ||
316 | log_radv("Next Router Advertisement in %s", | |
317 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
318 | timeout, USEC_PER_SEC)); | |
319 | ||
320 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, | |
321 | clock_boottime_or_monotonic(), | |
322 | time_now + timeout, MSEC_PER_SEC, | |
323 | radv_timeout, ra); | |
324 | if (r < 0) | |
325 | goto fail; | |
326 | ||
327 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
328 | ra->event_priority); | |
329 | if (r < 0) | |
330 | goto fail; | |
331 | ||
332 | r = sd_event_source_set_description(ra->timeout_event_source, | |
333 | "radv-timeout"); | |
334 | if (r < 0) | |
335 | goto fail; | |
336 | ||
337 | ra->ra_sent++; | |
338 | ||
339 | fail: | |
340 | if (r < 0) | |
341 | sd_radv_stop(ra); | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
204f99d2 | 346 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
347 | int r; |
348 | ||
204f99d2 PF |
349 | assert_return(ra, -EINVAL); |
350 | ||
351 | log_radv("Stopping IPv6 Router Advertisement daemon"); | |
352 | ||
204fb681 PF |
353 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
354 | with zero lifetime */ | |
355 | r = radv_send(ra, NULL, 0); | |
356 | if (r < 0) | |
357 | log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); | |
358 | ||
359 | radv_reset(ra); | |
77baf5ae | 360 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
361 | ra->state = SD_RADV_STATE_IDLE; |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | _public_ int sd_radv_start(sd_radv *ra) { | |
204fb681 PF |
367 | int r = 0; |
368 | ||
204f99d2 PF |
369 | assert_return(ra, -EINVAL); |
370 | assert_return(ra->event, -EINVAL); | |
371 | assert_return(ra->ifindex > 0, -EINVAL); | |
372 | ||
373 | if (ra->state != SD_RADV_STATE_IDLE) | |
374 | return 0; | |
375 | ||
204fb681 PF |
376 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, |
377 | clock_boottime_or_monotonic(), 0, 0, | |
378 | radv_timeout, ra); | |
379 | if (r < 0) | |
380 | goto fail; | |
381 | ||
382 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
383 | ra->event_priority); | |
384 | if (r < 0) | |
385 | goto fail; | |
386 | ||
387 | (void) sd_event_source_set_description(ra->timeout_event_source, | |
388 | "radv-timeout"); | |
389 | ||
77baf5ae PF |
390 | r = icmp6_bind_router_advertisement(ra->ifindex); |
391 | if (r < 0) | |
392 | goto fail; | |
393 | ||
394 | ra->fd = r; | |
88d5a3db PF |
395 | |
396 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
397 | if (r < 0) | |
398 | goto fail; | |
399 | ||
400 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
401 | if (r < 0) | |
402 | goto fail; | |
403 | ||
404 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 405 | |
204f99d2 PF |
406 | ra->state = SD_RADV_STATE_ADVERTISING; |
407 | ||
408 | log_radv("Started IPv6 Router Advertisement daemon"); | |
409 | ||
410 | return 0; | |
204fb681 PF |
411 | |
412 | fail: | |
413 | radv_reset(ra); | |
414 | ||
415 | return r; | |
204f99d2 PF |
416 | } |
417 | ||
418 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
419 | assert_return(ra, -EINVAL); | |
420 | assert_return(ifindex >= -1, -EINVAL); | |
421 | ||
422 | if (ra->state != SD_RADV_STATE_IDLE) | |
423 | return -EBUSY; | |
424 | ||
425 | ra->ifindex = ifindex; | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
431 | assert_return(ra, -EINVAL); | |
432 | ||
433 | if (ra->state != SD_RADV_STATE_IDLE) | |
434 | return -EBUSY; | |
435 | ||
436 | if (mac_addr) | |
437 | ra->mac_addr = *mac_addr; | |
438 | else | |
439 | zero(ra->mac_addr); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
445 | assert_return(ra, -EINVAL); | |
446 | assert_return(mtu >= 1280, -EINVAL); | |
447 | ||
448 | if (ra->state != SD_RADV_STATE_IDLE) | |
449 | return -EBUSY; | |
450 | ||
451 | ra->mtu = mtu; | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
457 | assert_return(ra, -EINVAL); | |
458 | ||
459 | if (ra->state != SD_RADV_STATE_IDLE) | |
460 | return -EBUSY; | |
461 | ||
462 | ra->hop_limit = hop_limit; | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
468 | assert_return(ra, -EINVAL); | |
469 | ||
470 | if (ra->state != SD_RADV_STATE_IDLE) | |
471 | return -EBUSY; | |
472 | ||
473 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
474 | preference value MUST be set to (00) by the sender..." */ | |
475 | if (router_lifetime == 0 && | |
476 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
477 | return -ETIME; | |
478 | ||
479 | ra->lifetime = router_lifetime; | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
485 | assert_return(ra, -EINVAL); | |
486 | ||
487 | if (ra->state != SD_RADV_STATE_IDLE) | |
488 | return -EBUSY; | |
489 | ||
490 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
496 | assert_return(ra, -EINVAL); | |
497 | ||
498 | if (ra->state != SD_RADV_STATE_IDLE) | |
499 | return -EBUSY; | |
500 | ||
501 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
507 | int r = 0; | |
508 | ||
509 | assert_return(ra, -EINVAL); | |
510 | assert_return(IN_SET(preference, | |
511 | SD_NDISC_PREFERENCE_LOW, | |
512 | SD_NDISC_PREFERENCE_MEDIUM, | |
513 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
514 | ||
515 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
516 | ||
517 | return r; | |
518 | } | |
519 | ||
520 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p) { | |
521 | sd_radv_prefix *cur; | |
522 | _cleanup_free_ char *addr_p = NULL; | |
523 | ||
524 | assert_return(ra, -EINVAL); | |
525 | ||
526 | if (!p) | |
527 | return -EINVAL; | |
528 | ||
529 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
530 | int r; | |
531 | ||
532 | r = in_addr_prefix_intersect(AF_INET6, | |
533 | (union in_addr_union*) &cur->opt.in6_addr, | |
534 | cur->opt.prefixlen, | |
535 | (union in_addr_union*) &p->opt.in6_addr, | |
536 | p->opt.prefixlen); | |
537 | if (r > 0) { | |
538 | _cleanup_free_ char *addr_cur = NULL; | |
539 | ||
540 | (void) in_addr_to_string(AF_INET6, | |
541 | (union in_addr_union*) &cur->opt.in6_addr, | |
542 | &addr_cur); | |
543 | (void) in_addr_to_string(AF_INET6, | |
544 | (union in_addr_union*) &p->opt.in6_addr, | |
545 | &addr_p); | |
546 | ||
547 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", | |
548 | addr_cur, cur->opt.prefixlen, | |
549 | addr_p, p->opt.prefixlen); | |
550 | ||
551 | return -EEXIST; | |
552 | } | |
553 | } | |
554 | ||
555 | p = sd_radv_prefix_ref(p); | |
556 | ||
557 | LIST_APPEND(prefix, ra->prefixes, p); | |
558 | ||
559 | ra->n_prefixes++; | |
560 | ||
561 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
562 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
e9c6da38 PF |
567 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
568 | const struct in6_addr *dns, size_t n_dns) { | |
569 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
570 | size_t len; | |
571 | ||
572 | assert_return(ra, -EINVAL); | |
573 | assert_return(n_dns < 128, -EINVAL); | |
574 | ||
575 | if (!dns || n_dns == 0) { | |
576 | ra->rdnss = mfree(ra->rdnss); | |
577 | ra->n_rdnss = 0; | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
583 | ||
584 | opt_rdnss = malloc0(len); | |
585 | if (!opt_rdnss) | |
586 | return -ENOMEM; | |
587 | ||
588 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
589 | opt_rdnss->length = len / 8; | |
590 | opt_rdnss->lifetime = htobe32(lifetime); | |
591 | ||
592 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
593 | ||
594 | free(ra->rdnss); | |
595 | ra->rdnss = opt_rdnss; | |
596 | opt_rdnss = NULL; | |
597 | ||
598 | ra->n_rdnss = n_dns; | |
599 | ||
600 | return 0; | |
601 | } | |
602 | ||
e965d6ab PF |
603 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
604 | char **search_list) { | |
605 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
606 | size_t len = 0; | |
607 | char **s; | |
608 | uint8_t *p; | |
609 | ||
610 | assert_return(ra, -EINVAL); | |
611 | ||
612 | if (!search_list || *search_list == NULL) { | |
613 | ra->dnssl = mfree(ra->dnssl); | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | STRV_FOREACH(s, search_list) | |
619 | len += strlen(*s) + 2; | |
620 | ||
621 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
622 | ||
623 | opt_dnssl = malloc0(len); | |
624 | if (!opt_dnssl) | |
625 | return -ENOMEM; | |
626 | ||
627 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
628 | opt_dnssl->length = len / 8; | |
629 | opt_dnssl->lifetime = htobe32(lifetime); | |
630 | ||
631 | p = (uint8_t *)(opt_dnssl + 1); | |
632 | len -= sizeof(struct sd_radv_opt_dns); | |
633 | ||
634 | STRV_FOREACH(s, search_list) { | |
635 | int r; | |
636 | ||
637 | r = dns_name_to_wire_format(*s, p, len, false); | |
638 | if (r < 0) | |
639 | return r; | |
640 | ||
641 | if (len < (size_t)r) | |
642 | return -ENOBUFS; | |
643 | ||
644 | p += r; | |
645 | len -= r; | |
646 | } | |
647 | ||
648 | free(ra->dnssl); | |
649 | ra->dnssl = opt_dnssl; | |
650 | opt_dnssl = NULL; | |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
04473969 PF |
655 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
656 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
657 | ||
658 | assert_return(ret, -EINVAL); | |
659 | ||
660 | p = new0(sd_radv_prefix, 1); | |
661 | if (!p) | |
662 | return -ENOMEM; | |
663 | ||
664 | p->n_ref = 1; | |
665 | ||
666 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
667 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
668 | ||
669 | p->opt.prefixlen = 64; | |
670 | ||
671 | /* RFC 4861, Section 6.2.1 */ | |
672 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
673 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
674 | p->opt.preferred_lifetime = htobe32(604800); | |
675 | p->opt.valid_lifetime = htobe32(2592000); | |
676 | ||
204f99d2 PF |
677 | LIST_INIT(prefix, p); |
678 | ||
04473969 PF |
679 | *ret = p; |
680 | p = NULL; | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
685 | _public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) { | |
686 | if (!p) | |
687 | return NULL; | |
688 | ||
689 | assert(p->n_ref > 0); | |
690 | p->n_ref++; | |
691 | ||
692 | return p; | |
693 | } | |
694 | ||
695 | _public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) { | |
696 | if (!p) | |
697 | return NULL; | |
698 | ||
699 | assert(p->n_ref > 0); | |
700 | p->n_ref--; | |
701 | ||
702 | if (p->n_ref > 0) | |
703 | return NULL; | |
704 | ||
705 | return mfree(p); | |
706 | } | |
707 | ||
708 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, struct in6_addr *in6_addr, | |
709 | unsigned char prefixlen) { | |
710 | assert_return(p, -EINVAL); | |
711 | assert_return(in6_addr, -EINVAL); | |
712 | ||
713 | if (prefixlen < 3 || prefixlen > 128) | |
714 | return -EINVAL; | |
715 | ||
716 | if (prefixlen > 64) | |
717 | /* unusual but allowed, log it */ | |
718 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
719 | ||
720 | p->opt.in6_addr = *in6_addr; | |
721 | p->opt.prefixlen = prefixlen; | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
727 | assert_return(p, -EINVAL); | |
728 | ||
729 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
735 | int address_autoconfiguration) { | |
736 | assert_return(p, -EINVAL); | |
737 | ||
738 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
743 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
744 | uint32_t valid_lifetime) { | |
745 | assert_return(p, -EINVAL); | |
746 | ||
747 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
753 | uint32_t preferred_lifetime) { | |
754 | assert_return(p, -EINVAL); | |
755 | ||
756 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
757 | ||
758 | return 0; | |
759 | } |