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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
04473969 PF |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright (C) 2017 Intel Corporation. All rights reserved. | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <netinet/icmp6.h> | |
22 | #include <netinet/in.h> | |
204f99d2 | 23 | #include <arpa/inet.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 | }; | |
d601b566 PF |
171 | usec_t time_now; |
172 | int r; | |
173 | ||
174 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
175 | if (r < 0) | |
176 | return r; | |
77baf5ae | 177 | |
88d5a3db | 178 | if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst)) |
77baf5ae | 179 | dst_addr.sin6_addr = *dst; |
88d5a3db | 180 | |
77baf5ae PF |
181 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
182 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
183 | adv.nd_ra_flags_reserved = ra->flags; | |
184 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
185 | iov[msg.msg_iovlen].iov_base = &adv; | |
186 | iov[msg.msg_iovlen].iov_len = sizeof(adv); | |
187 | msg.msg_iovlen++; | |
188 | ||
189 | /* MAC address is optional, either because the link does not use L2 | |
190 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
191 | if (memcmp(&mac_zero, &ra->mac_addr, sizeof(mac_zero))) { | |
192 | opt_mac.slladdr = ra->mac_addr; | |
193 | iov[msg.msg_iovlen].iov_base = &opt_mac; | |
194 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mac); | |
195 | msg.msg_iovlen++; | |
196 | } | |
197 | ||
198 | if (ra->mtu) { | |
199 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
200 | iov[msg.msg_iovlen].iov_base = &opt_mtu; | |
201 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu); | |
202 | msg.msg_iovlen++; | |
203 | } | |
204 | ||
205 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
206 | if (p->valid_until) { |
207 | ||
208 | if (time_now > p->valid_until) | |
209 | p->opt.valid_lifetime = 0; | |
210 | else | |
211 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
212 | ||
213 | if (time_now > p->preferred_until) | |
214 | p->opt.preferred_lifetime = 0; | |
215 | else | |
216 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
217 | } | |
77baf5ae PF |
218 | iov[msg.msg_iovlen].iov_base = &p->opt; |
219 | iov[msg.msg_iovlen].iov_len = sizeof(p->opt); | |
220 | msg.msg_iovlen++; | |
221 | } | |
222 | ||
e9c6da38 PF |
223 | if (ra->rdnss) { |
224 | iov[msg.msg_iovlen].iov_base = ra->rdnss; | |
225 | iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8; | |
226 | msg.msg_iovlen++; | |
227 | } | |
228 | ||
e965d6ab PF |
229 | if (ra->dnssl) { |
230 | iov[msg.msg_iovlen].iov_base = ra->dnssl; | |
231 | iov[msg.msg_iovlen].iov_len = ra->dnssl->length * 8; | |
232 | msg.msg_iovlen++; | |
233 | } | |
234 | ||
77baf5ae PF |
235 | if (sendmsg(ra->fd, &msg, 0) < 0) |
236 | return -errno; | |
204fb681 | 237 | |
77baf5ae | 238 | return 0; |
204fb681 PF |
239 | } |
240 | ||
88d5a3db PF |
241 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
242 | sd_radv *ra = userdata; | |
243 | _cleanup_free_ char *addr = NULL; | |
244 | struct in6_addr src; | |
245 | triple_timestamp timestamp; | |
246 | int r; | |
247 | ssize_t buflen; | |
248 | _cleanup_free_ char *buf = NULL; | |
249 | ||
250 | assert(s); | |
251 | assert(ra); | |
252 | assert(ra->event); | |
253 | ||
254 | buflen = next_datagram_size_fd(fd); | |
255 | ||
256 | if ((unsigned) buflen < sizeof(struct nd_router_solicit)) | |
257 | return log_radv("Too short packet received"); | |
258 | ||
259 | buf = new0(char, buflen); | |
260 | if (!buf) | |
261 | return 0; | |
262 | ||
263 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
264 | if (r < 0) { | |
265 | switch (r) { | |
266 | case -EADDRNOTAVAIL: | |
267 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
268 | log_radv("Received RS from non-link-local address %s. Ignoring", addr); | |
269 | break; | |
270 | ||
271 | case -EMULTIHOP: | |
272 | log_radv("Received RS with invalid hop limit. Ignoring."); | |
273 | break; | |
274 | ||
275 | case -EPFNOSUPPORT: | |
276 | log_radv("Received invalid source address from ICMPv6 socket. Ignoring."); | |
277 | break; | |
278 | ||
279 | default: | |
280 | log_radv_warning_errno(r, "Error receiving from ICMPv6 socket: %m"); | |
281 | break; | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
288 | ||
289 | r = radv_send(ra, &src, ra->lifetime); | |
290 | if (r < 0) | |
291 | log_radv_warning_errno(r, "Unable to send solicited Router Advertisment to %s: %m", addr); | |
292 | else | |
293 | log_radv("Sent solicited Router Advertisement to %s", addr); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
204fb681 PF |
298 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
299 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
300 | ||
301 | return min + (random_u32() % (max - min)); | |
302 | } | |
303 | ||
304 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
305 | int r; | |
306 | sd_radv *ra = userdata; | |
307 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
308 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
309 | usec_t time_now, timeout; | |
310 | char time_string[FORMAT_TIMESPAN_MAX]; | |
311 | ||
312 | assert(s); | |
313 | assert(ra); | |
314 | assert(ra->event); | |
315 | ||
316 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); | |
317 | ||
318 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
319 | if (r < 0) | |
320 | goto fail; | |
321 | ||
322 | r = radv_send(ra, NULL, ra->lifetime); | |
323 | if (r < 0) | |
324 | log_radv_warning_errno(r, "Unable to send Router Advertisement: %m"); | |
325 | ||
326 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
327 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
328 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
329 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
330 | } | |
331 | ||
332 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
333 | ||
334 | log_radv("Next Router Advertisement in %s", | |
335 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
336 | timeout, USEC_PER_SEC)); | |
337 | ||
338 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, | |
339 | clock_boottime_or_monotonic(), | |
340 | time_now + timeout, MSEC_PER_SEC, | |
341 | radv_timeout, ra); | |
342 | if (r < 0) | |
343 | goto fail; | |
344 | ||
345 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
346 | ra->event_priority); | |
347 | if (r < 0) | |
348 | goto fail; | |
349 | ||
350 | r = sd_event_source_set_description(ra->timeout_event_source, | |
351 | "radv-timeout"); | |
352 | if (r < 0) | |
353 | goto fail; | |
354 | ||
355 | ra->ra_sent++; | |
356 | ||
357 | fail: | |
358 | if (r < 0) | |
359 | sd_radv_stop(ra); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
204f99d2 | 364 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
365 | int r; |
366 | ||
204f99d2 PF |
367 | assert_return(ra, -EINVAL); |
368 | ||
369 | log_radv("Stopping IPv6 Router Advertisement daemon"); | |
370 | ||
204fb681 PF |
371 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
372 | with zero lifetime */ | |
373 | r = radv_send(ra, NULL, 0); | |
374 | if (r < 0) | |
375 | log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); | |
376 | ||
377 | radv_reset(ra); | |
77baf5ae | 378 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
379 | ra->state = SD_RADV_STATE_IDLE; |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | _public_ int sd_radv_start(sd_radv *ra) { | |
204fb681 PF |
385 | int r = 0; |
386 | ||
204f99d2 PF |
387 | assert_return(ra, -EINVAL); |
388 | assert_return(ra->event, -EINVAL); | |
389 | assert_return(ra->ifindex > 0, -EINVAL); | |
390 | ||
391 | if (ra->state != SD_RADV_STATE_IDLE) | |
392 | return 0; | |
393 | ||
204fb681 PF |
394 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, |
395 | clock_boottime_or_monotonic(), 0, 0, | |
396 | radv_timeout, ra); | |
397 | if (r < 0) | |
398 | goto fail; | |
399 | ||
400 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
401 | ra->event_priority); | |
402 | if (r < 0) | |
403 | goto fail; | |
404 | ||
405 | (void) sd_event_source_set_description(ra->timeout_event_source, | |
406 | "radv-timeout"); | |
407 | ||
77baf5ae PF |
408 | r = icmp6_bind_router_advertisement(ra->ifindex); |
409 | if (r < 0) | |
410 | goto fail; | |
411 | ||
412 | ra->fd = r; | |
88d5a3db PF |
413 | |
414 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
415 | if (r < 0) | |
416 | goto fail; | |
417 | ||
418 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
419 | if (r < 0) | |
420 | goto fail; | |
421 | ||
422 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 423 | |
204f99d2 PF |
424 | ra->state = SD_RADV_STATE_ADVERTISING; |
425 | ||
426 | log_radv("Started IPv6 Router Advertisement daemon"); | |
427 | ||
428 | return 0; | |
204fb681 PF |
429 | |
430 | fail: | |
431 | radv_reset(ra); | |
432 | ||
433 | return r; | |
204f99d2 PF |
434 | } |
435 | ||
436 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
437 | assert_return(ra, -EINVAL); | |
438 | assert_return(ifindex >= -1, -EINVAL); | |
439 | ||
440 | if (ra->state != SD_RADV_STATE_IDLE) | |
441 | return -EBUSY; | |
442 | ||
443 | ra->ifindex = ifindex; | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
449 | assert_return(ra, -EINVAL); | |
450 | ||
451 | if (ra->state != SD_RADV_STATE_IDLE) | |
452 | return -EBUSY; | |
453 | ||
454 | if (mac_addr) | |
455 | ra->mac_addr = *mac_addr; | |
456 | else | |
457 | zero(ra->mac_addr); | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
463 | assert_return(ra, -EINVAL); | |
464 | assert_return(mtu >= 1280, -EINVAL); | |
465 | ||
204f99d2 PF |
466 | ra->mtu = mtu; |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
471 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
472 | assert_return(ra, -EINVAL); | |
473 | ||
474 | if (ra->state != SD_RADV_STATE_IDLE) | |
475 | return -EBUSY; | |
476 | ||
477 | ra->hop_limit = hop_limit; | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
483 | assert_return(ra, -EINVAL); | |
484 | ||
485 | if (ra->state != SD_RADV_STATE_IDLE) | |
486 | return -EBUSY; | |
487 | ||
488 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
489 | preference value MUST be set to (00) by the sender..." */ | |
490 | if (router_lifetime == 0 && | |
491 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
492 | return -ETIME; | |
493 | ||
494 | ra->lifetime = router_lifetime; | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
500 | assert_return(ra, -EINVAL); | |
501 | ||
502 | if (ra->state != SD_RADV_STATE_IDLE) | |
503 | return -EBUSY; | |
504 | ||
505 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
511 | assert_return(ra, -EINVAL); | |
512 | ||
513 | if (ra->state != SD_RADV_STATE_IDLE) | |
514 | return -EBUSY; | |
515 | ||
516 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
522 | int r = 0; | |
523 | ||
524 | assert_return(ra, -EINVAL); | |
525 | assert_return(IN_SET(preference, | |
526 | SD_NDISC_PREFERENCE_LOW, | |
527 | SD_NDISC_PREFERENCE_MEDIUM, | |
528 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
529 | ||
530 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
531 | ||
532 | return r; | |
533 | } | |
534 | ||
d601b566 | 535 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, bool dynamic) { |
204f99d2 | 536 | sd_radv_prefix *cur; |
d601b566 | 537 | int r; |
204f99d2 | 538 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
539 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
540 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
541 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
542 | |
543 | assert_return(ra, -EINVAL); | |
544 | ||
545 | if (!p) | |
546 | return -EINVAL; | |
547 | ||
548 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
204f99d2 PF |
549 | |
550 | r = in_addr_prefix_intersect(AF_INET6, | |
551 | (union in_addr_union*) &cur->opt.in6_addr, | |
552 | cur->opt.prefixlen, | |
553 | (union in_addr_union*) &p->opt.in6_addr, | |
554 | p->opt.prefixlen); | |
555 | if (r > 0) { | |
556 | _cleanup_free_ char *addr_cur = NULL; | |
557 | ||
204f99d2 PF |
558 | (void) in_addr_to_string(AF_INET6, |
559 | (union in_addr_union*) &p->opt.in6_addr, | |
560 | &addr_p); | |
561 | ||
d601b566 PF |
562 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
563 | goto update; | |
564 | ||
565 | (void) in_addr_to_string(AF_INET6, | |
566 | (union in_addr_union*) &cur->opt.in6_addr, | |
567 | &addr_cur); | |
204f99d2 PF |
568 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", |
569 | addr_cur, cur->opt.prefixlen, | |
570 | addr_p, p->opt.prefixlen); | |
571 | ||
572 | return -EEXIST; | |
573 | } | |
574 | } | |
575 | ||
576 | p = sd_radv_prefix_ref(p); | |
577 | ||
578 | LIST_APPEND(prefix, ra->prefixes, p); | |
579 | ||
580 | ra->n_prefixes++; | |
581 | ||
582 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
d601b566 PF |
583 | |
584 | if (!dynamic) { | |
585 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
586 | return 0; | |
587 | } | |
588 | ||
589 | cur = p; | |
590 | ||
591 | update: | |
592 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
593 | if (r < 0) | |
594 | return r; | |
595 | ||
596 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
597 | valid_until = usec_add(valid, time_now); | |
598 | if (valid_until == USEC_INFINITY) | |
599 | return -EOVERFLOW; | |
600 | ||
601 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
602 | preferred_until = usec_add(preferred, time_now); | |
603 | if (preferred_until == USEC_INFINITY) | |
604 | return -EOVERFLOW; | |
605 | ||
606 | cur->valid_until = valid_until; | |
607 | cur->preferred_until = preferred_until; | |
608 | ||
609 | log_radv("%s prefix %s/%u preferred %s valid %s", | |
610 | cur? "Updated": "Added", | |
611 | addr_p, p->opt.prefixlen, | |
612 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, | |
613 | preferred, USEC_PER_SEC), | |
614 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
615 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
616 | |
617 | return 0; | |
618 | } | |
619 | ||
34c169c4 PF |
620 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
621 | struct in6_addr *prefix, | |
622 | uint8_t prefixlen) { | |
623 | sd_radv_prefix *cur, *next; | |
624 | ||
625 | assert_return(ra, NULL); | |
626 | assert_return(prefix, NULL); | |
627 | ||
628 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
629 | if (prefixlen != cur->opt.prefixlen) | |
630 | continue; | |
631 | ||
632 | if (!in_addr_equal(AF_INET6, | |
633 | (union in_addr_union *)prefix, | |
634 | (union in_addr_union *)&cur->opt.in6_addr)) | |
635 | continue; | |
636 | ||
637 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
638 | ra->n_prefixes--; | |
639 | ||
640 | break; | |
641 | } | |
642 | ||
643 | return cur; | |
644 | } | |
645 | ||
e9c6da38 PF |
646 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
647 | const struct in6_addr *dns, size_t n_dns) { | |
648 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
649 | size_t len; | |
650 | ||
651 | assert_return(ra, -EINVAL); | |
652 | assert_return(n_dns < 128, -EINVAL); | |
653 | ||
654 | if (!dns || n_dns == 0) { | |
655 | ra->rdnss = mfree(ra->rdnss); | |
656 | ra->n_rdnss = 0; | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
661 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
662 | ||
663 | opt_rdnss = malloc0(len); | |
664 | if (!opt_rdnss) | |
665 | return -ENOMEM; | |
666 | ||
667 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
668 | opt_rdnss->length = len / 8; | |
669 | opt_rdnss->lifetime = htobe32(lifetime); | |
670 | ||
671 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
672 | ||
673 | free(ra->rdnss); | |
674 | ra->rdnss = opt_rdnss; | |
675 | opt_rdnss = NULL; | |
676 | ||
677 | ra->n_rdnss = n_dns; | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
e965d6ab PF |
682 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
683 | char **search_list) { | |
684 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
685 | size_t len = 0; | |
686 | char **s; | |
687 | uint8_t *p; | |
688 | ||
689 | assert_return(ra, -EINVAL); | |
690 | ||
691 | if (!search_list || *search_list == NULL) { | |
692 | ra->dnssl = mfree(ra->dnssl); | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | STRV_FOREACH(s, search_list) | |
698 | len += strlen(*s) + 2; | |
699 | ||
700 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
701 | ||
702 | opt_dnssl = malloc0(len); | |
703 | if (!opt_dnssl) | |
704 | return -ENOMEM; | |
705 | ||
706 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
707 | opt_dnssl->length = len / 8; | |
708 | opt_dnssl->lifetime = htobe32(lifetime); | |
709 | ||
710 | p = (uint8_t *)(opt_dnssl + 1); | |
711 | len -= sizeof(struct sd_radv_opt_dns); | |
712 | ||
713 | STRV_FOREACH(s, search_list) { | |
714 | int r; | |
715 | ||
716 | r = dns_name_to_wire_format(*s, p, len, false); | |
717 | if (r < 0) | |
718 | return r; | |
719 | ||
720 | if (len < (size_t)r) | |
721 | return -ENOBUFS; | |
722 | ||
723 | p += r; | |
724 | len -= r; | |
725 | } | |
726 | ||
727 | free(ra->dnssl); | |
728 | ra->dnssl = opt_dnssl; | |
729 | opt_dnssl = NULL; | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
04473969 PF |
734 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
735 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
736 | ||
737 | assert_return(ret, -EINVAL); | |
738 | ||
739 | p = new0(sd_radv_prefix, 1); | |
740 | if (!p) | |
741 | return -ENOMEM; | |
742 | ||
743 | p->n_ref = 1; | |
744 | ||
745 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
746 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
747 | ||
748 | p->opt.prefixlen = 64; | |
749 | ||
750 | /* RFC 4861, Section 6.2.1 */ | |
751 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
752 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
753 | p->opt.preferred_lifetime = htobe32(604800); | |
754 | p->opt.valid_lifetime = htobe32(2592000); | |
755 | ||
204f99d2 PF |
756 | LIST_INIT(prefix, p); |
757 | ||
04473969 PF |
758 | *ret = p; |
759 | p = NULL; | |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
764 | _public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) { | |
765 | if (!p) | |
766 | return NULL; | |
767 | ||
768 | assert(p->n_ref > 0); | |
769 | p->n_ref++; | |
770 | ||
771 | return p; | |
772 | } | |
773 | ||
774 | _public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) { | |
775 | if (!p) | |
776 | return NULL; | |
777 | ||
778 | assert(p->n_ref > 0); | |
779 | p->n_ref--; | |
780 | ||
781 | if (p->n_ref > 0) | |
782 | return NULL; | |
783 | ||
784 | return mfree(p); | |
785 | } | |
786 | ||
787 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, struct in6_addr *in6_addr, | |
788 | unsigned char prefixlen) { | |
789 | assert_return(p, -EINVAL); | |
790 | assert_return(in6_addr, -EINVAL); | |
791 | ||
792 | if (prefixlen < 3 || prefixlen > 128) | |
793 | return -EINVAL; | |
794 | ||
795 | if (prefixlen > 64) | |
796 | /* unusual but allowed, log it */ | |
797 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
798 | ||
799 | p->opt.in6_addr = *in6_addr; | |
800 | p->opt.prefixlen = prefixlen; | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
805 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
806 | assert_return(p, -EINVAL); | |
807 | ||
808 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
814 | int address_autoconfiguration) { | |
815 | assert_return(p, -EINVAL); | |
816 | ||
817 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
822 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
823 | uint32_t valid_lifetime) { | |
824 | assert_return(p, -EINVAL); | |
825 | ||
826 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
831 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
832 | uint32_t preferred_lifetime) { | |
833 | assert_return(p, -EINVAL); | |
834 | ||
835 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
836 | ||
837 | return 0; | |
838 | } |