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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
04473969 | 2 | /*** |
810adae9 | 3 | Copyright © 2017 Intel Corporation. All rights reserved. |
04473969 PF |
4 | ***/ |
5 | ||
6 | #include <netinet/icmp6.h> | |
7 | #include <netinet/in.h> | |
204f99d2 | 8 | #include <arpa/inet.h> |
04473969 PF |
9 | |
10 | #include "sd-radv.h" | |
11 | ||
204f99d2 | 12 | #include "macro.h" |
04473969 | 13 | #include "alloc-util.h" |
e965d6ab | 14 | #include "dns-domain.h" |
04473969 PF |
15 | #include "fd-util.h" |
16 | #include "icmp6-util.h" | |
17 | #include "in-addr-util.h" | |
18 | #include "radv-internal.h" | |
19 | #include "socket-util.h" | |
20 | #include "string-util.h" | |
e965d6ab | 21 | #include "strv.h" |
04473969 | 22 | #include "util.h" |
204fb681 | 23 | #include "random-util.h" |
04473969 | 24 | |
204f99d2 PF |
25 | _public_ int sd_radv_new(sd_radv **ret) { |
26 | _cleanup_(sd_radv_unrefp) sd_radv *ra = NULL; | |
27 | ||
28 | assert_return(ret, -EINVAL); | |
29 | ||
30 | ra = new0(sd_radv, 1); | |
31 | if (!ra) | |
32 | return -ENOMEM; | |
33 | ||
34 | ra->n_ref = 1; | |
77baf5ae | 35 | ra->fd = -1; |
204f99d2 PF |
36 | |
37 | LIST_HEAD_INIT(ra->prefixes); | |
38 | ||
1cc6c93a | 39 | *ret = TAKE_PTR(ra); |
204f99d2 PF |
40 | |
41 | return 0; | |
42 | } | |
43 | ||
44 | _public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) { | |
45 | int r; | |
46 | ||
47 | assert_return(ra, -EINVAL); | |
48 | assert_return(!ra->event, -EBUSY); | |
49 | ||
50 | if (event) | |
51 | ra->event = sd_event_ref(event); | |
52 | else { | |
53 | r = sd_event_default(&ra->event); | |
54 | if (r < 0) | |
55 | return 0; | |
56 | } | |
57 | ||
58 | ra->event_priority = priority; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | _public_ int sd_radv_detach_event(sd_radv *ra) { | |
64 | ||
65 | assert_return(ra, -EINVAL); | |
66 | ||
67 | ra->event = sd_event_unref(ra->event); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | _public_ sd_event *sd_radv_get_event(sd_radv *ra) { | |
72 | assert_return(ra, NULL); | |
73 | ||
74 | return ra->event; | |
75 | } | |
76 | ||
204fb681 | 77 | static void radv_reset(sd_radv *ra) { |
c4b6dda0 | 78 | assert(ra); |
204fb681 PF |
79 | |
80 | ra->timeout_event_source = | |
81 | sd_event_source_unref(ra->timeout_event_source); | |
82 | ||
88d5a3db PF |
83 | ra->recv_event_source = |
84 | sd_event_source_unref(ra->recv_event_source); | |
85 | ||
204fb681 PF |
86 | ra->ra_sent = 0; |
87 | } | |
88 | ||
204f99d2 PF |
89 | _public_ sd_radv *sd_radv_ref(sd_radv *ra) { |
90 | if (!ra) | |
91 | return NULL; | |
92 | ||
93 | assert(ra->n_ref > 0); | |
94 | ra->n_ref++; | |
95 | ||
96 | return ra; | |
97 | } | |
98 | ||
99 | _public_ sd_radv *sd_radv_unref(sd_radv *ra) { | |
100 | if (!ra) | |
101 | return NULL; | |
102 | ||
103 | assert(ra->n_ref > 0); | |
104 | ra->n_ref--; | |
105 | ||
106 | if (ra->n_ref > 0) | |
107 | return NULL; | |
108 | ||
109 | while (ra->prefixes) { | |
110 | sd_radv_prefix *p = ra->prefixes; | |
111 | ||
112 | LIST_REMOVE(prefix, ra->prefixes, p); | |
113 | sd_radv_prefix_unref(p); | |
114 | } | |
115 | ||
e9c6da38 | 116 | free(ra->rdnss); |
f9aa5417 | 117 | free(ra->dnssl); |
e9c6da38 | 118 | |
204fb681 PF |
119 | radv_reset(ra); |
120 | ||
204f99d2 | 121 | sd_radv_detach_event(ra); |
c4b6dda0 LP |
122 | |
123 | ra->fd = safe_close(ra->fd); | |
124 | ||
204f99d2 PF |
125 | return mfree(ra); |
126 | } | |
127 | ||
204fb681 PF |
128 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, |
129 | const uint32_t router_lifetime) { | |
77baf5ae PF |
130 | static const struct ether_addr mac_zero = {}; |
131 | sd_radv_prefix *p; | |
132 | struct sockaddr_in6 dst_addr = { | |
133 | .sin6_family = AF_INET6, | |
134 | .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
135 | }; | |
136 | struct nd_router_advert adv = {}; | |
137 | struct { | |
138 | struct nd_opt_hdr opthdr; | |
139 | struct ether_addr slladdr; | |
140 | } _packed_ opt_mac = { | |
141 | .opthdr = { | |
142 | .nd_opt_type = ND_OPT_SOURCE_LINKADDR, | |
143 | .nd_opt_len = (sizeof(struct nd_opt_hdr) + | |
144 | sizeof(struct ether_addr) - 1) /8 + 1, | |
145 | }, | |
146 | }; | |
147 | struct nd_opt_mtu opt_mtu = { | |
148 | .nd_opt_mtu_type = ND_OPT_MTU, | |
149 | .nd_opt_mtu_len = 1, | |
150 | }; | |
6852c0f6 PF |
151 | /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, RDNSS |
152 | and DNSSL */ | |
153 | struct iovec iov[5 + ra->n_prefixes]; | |
77baf5ae PF |
154 | struct msghdr msg = { |
155 | .msg_name = &dst_addr, | |
156 | .msg_namelen = sizeof(dst_addr), | |
157 | .msg_iov = iov, | |
158 | }; | |
d601b566 PF |
159 | usec_t time_now; |
160 | int r; | |
161 | ||
162 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
163 | if (r < 0) | |
164 | return r; | |
77baf5ae | 165 | |
88d5a3db | 166 | if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst)) |
77baf5ae | 167 | dst_addr.sin6_addr = *dst; |
88d5a3db | 168 | |
77baf5ae PF |
169 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
170 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
171 | adv.nd_ra_flags_reserved = ra->flags; | |
172 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
173 | iov[msg.msg_iovlen].iov_base = &adv; | |
174 | iov[msg.msg_iovlen].iov_len = sizeof(adv); | |
175 | msg.msg_iovlen++; | |
176 | ||
177 | /* MAC address is optional, either because the link does not use L2 | |
178 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
179 | if (memcmp(&mac_zero, &ra->mac_addr, sizeof(mac_zero))) { | |
180 | opt_mac.slladdr = ra->mac_addr; | |
181 | iov[msg.msg_iovlen].iov_base = &opt_mac; | |
182 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mac); | |
183 | msg.msg_iovlen++; | |
184 | } | |
185 | ||
186 | if (ra->mtu) { | |
187 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
188 | iov[msg.msg_iovlen].iov_base = &opt_mtu; | |
189 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu); | |
190 | msg.msg_iovlen++; | |
191 | } | |
192 | ||
193 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
194 | if (p->valid_until) { |
195 | ||
196 | if (time_now > p->valid_until) | |
197 | p->opt.valid_lifetime = 0; | |
198 | else | |
199 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
200 | ||
201 | if (time_now > p->preferred_until) | |
202 | p->opt.preferred_lifetime = 0; | |
203 | else | |
204 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
205 | } | |
77baf5ae PF |
206 | iov[msg.msg_iovlen].iov_base = &p->opt; |
207 | iov[msg.msg_iovlen].iov_len = sizeof(p->opt); | |
208 | msg.msg_iovlen++; | |
209 | } | |
210 | ||
e9c6da38 PF |
211 | if (ra->rdnss) { |
212 | iov[msg.msg_iovlen].iov_base = ra->rdnss; | |
213 | iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8; | |
214 | msg.msg_iovlen++; | |
215 | } | |
216 | ||
e965d6ab PF |
217 | if (ra->dnssl) { |
218 | iov[msg.msg_iovlen].iov_base = ra->dnssl; | |
219 | iov[msg.msg_iovlen].iov_len = ra->dnssl->length * 8; | |
220 | msg.msg_iovlen++; | |
221 | } | |
222 | ||
77baf5ae PF |
223 | if (sendmsg(ra->fd, &msg, 0) < 0) |
224 | return -errno; | |
204fb681 | 225 | |
77baf5ae | 226 | return 0; |
204fb681 PF |
227 | } |
228 | ||
88d5a3db PF |
229 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
230 | sd_radv *ra = userdata; | |
231 | _cleanup_free_ char *addr = NULL; | |
232 | struct in6_addr src; | |
233 | triple_timestamp timestamp; | |
234 | int r; | |
235 | ssize_t buflen; | |
236 | _cleanup_free_ char *buf = NULL; | |
237 | ||
238 | assert(s); | |
239 | assert(ra); | |
240 | assert(ra->event); | |
241 | ||
242 | buflen = next_datagram_size_fd(fd); | |
243 | ||
244 | if ((unsigned) buflen < sizeof(struct nd_router_solicit)) | |
245 | return log_radv("Too short packet received"); | |
246 | ||
247 | buf = new0(char, buflen); | |
248 | if (!buf) | |
249 | return 0; | |
250 | ||
251 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
252 | if (r < 0) { | |
253 | switch (r) { | |
254 | case -EADDRNOTAVAIL: | |
255 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
256 | log_radv("Received RS from non-link-local address %s. Ignoring", addr); | |
257 | break; | |
258 | ||
259 | case -EMULTIHOP: | |
260 | log_radv("Received RS with invalid hop limit. Ignoring."); | |
261 | break; | |
262 | ||
263 | case -EPFNOSUPPORT: | |
264 | log_radv("Received invalid source address from ICMPv6 socket. Ignoring."); | |
265 | break; | |
266 | ||
267 | default: | |
268 | log_radv_warning_errno(r, "Error receiving from ICMPv6 socket: %m"); | |
269 | break; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
276 | ||
277 | r = radv_send(ra, &src, ra->lifetime); | |
278 | if (r < 0) | |
279 | log_radv_warning_errno(r, "Unable to send solicited Router Advertisment to %s: %m", addr); | |
280 | else | |
281 | log_radv("Sent solicited Router Advertisement to %s", addr); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
204fb681 PF |
286 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
287 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
288 | ||
289 | return min + (random_u32() % (max - min)); | |
290 | } | |
291 | ||
292 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
293 | int r; | |
294 | sd_radv *ra = userdata; | |
295 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
296 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
297 | usec_t time_now, timeout; | |
298 | char time_string[FORMAT_TIMESPAN_MAX]; | |
299 | ||
300 | assert(s); | |
301 | assert(ra); | |
302 | assert(ra->event); | |
303 | ||
304 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); | |
305 | ||
306 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
307 | if (r < 0) | |
308 | goto fail; | |
309 | ||
310 | r = radv_send(ra, NULL, ra->lifetime); | |
311 | if (r < 0) | |
312 | log_radv_warning_errno(r, "Unable to send Router Advertisement: %m"); | |
313 | ||
314 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
315 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
316 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
317 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
318 | } | |
319 | ||
320 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
321 | ||
322 | log_radv("Next Router Advertisement in %s", | |
323 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
324 | timeout, USEC_PER_SEC)); | |
325 | ||
326 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, | |
327 | clock_boottime_or_monotonic(), | |
328 | time_now + timeout, MSEC_PER_SEC, | |
329 | radv_timeout, ra); | |
330 | if (r < 0) | |
331 | goto fail; | |
332 | ||
333 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
334 | ra->event_priority); | |
335 | if (r < 0) | |
336 | goto fail; | |
337 | ||
338 | r = sd_event_source_set_description(ra->timeout_event_source, | |
339 | "radv-timeout"); | |
340 | if (r < 0) | |
341 | goto fail; | |
342 | ||
343 | ra->ra_sent++; | |
344 | ||
345 | fail: | |
346 | if (r < 0) | |
347 | sd_radv_stop(ra); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
204f99d2 | 352 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
353 | int r; |
354 | ||
204f99d2 PF |
355 | assert_return(ra, -EINVAL); |
356 | ||
6f8a8b84 SS |
357 | if (ra->state == SD_RADV_STATE_IDLE) |
358 | return 0; | |
359 | ||
204f99d2 PF |
360 | log_radv("Stopping IPv6 Router Advertisement daemon"); |
361 | ||
204fb681 PF |
362 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
363 | with zero lifetime */ | |
364 | r = radv_send(ra, NULL, 0); | |
365 | if (r < 0) | |
366 | log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); | |
367 | ||
368 | radv_reset(ra); | |
77baf5ae | 369 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
370 | ra->state = SD_RADV_STATE_IDLE; |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | _public_ int sd_radv_start(sd_radv *ra) { | |
204fb681 PF |
376 | int r = 0; |
377 | ||
204f99d2 PF |
378 | assert_return(ra, -EINVAL); |
379 | assert_return(ra->event, -EINVAL); | |
380 | assert_return(ra->ifindex > 0, -EINVAL); | |
381 | ||
382 | if (ra->state != SD_RADV_STATE_IDLE) | |
383 | return 0; | |
384 | ||
204fb681 PF |
385 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, |
386 | clock_boottime_or_monotonic(), 0, 0, | |
387 | radv_timeout, ra); | |
388 | if (r < 0) | |
389 | goto fail; | |
390 | ||
391 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
392 | ra->event_priority); | |
393 | if (r < 0) | |
394 | goto fail; | |
395 | ||
396 | (void) sd_event_source_set_description(ra->timeout_event_source, | |
397 | "radv-timeout"); | |
398 | ||
77baf5ae PF |
399 | r = icmp6_bind_router_advertisement(ra->ifindex); |
400 | if (r < 0) | |
401 | goto fail; | |
402 | ||
403 | ra->fd = r; | |
88d5a3db PF |
404 | |
405 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
406 | if (r < 0) | |
407 | goto fail; | |
408 | ||
409 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
410 | if (r < 0) | |
411 | goto fail; | |
412 | ||
413 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 414 | |
204f99d2 PF |
415 | ra->state = SD_RADV_STATE_ADVERTISING; |
416 | ||
417 | log_radv("Started IPv6 Router Advertisement daemon"); | |
418 | ||
419 | return 0; | |
204fb681 PF |
420 | |
421 | fail: | |
422 | radv_reset(ra); | |
423 | ||
424 | return r; | |
204f99d2 PF |
425 | } |
426 | ||
427 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
428 | assert_return(ra, -EINVAL); | |
429 | assert_return(ifindex >= -1, -EINVAL); | |
430 | ||
431 | if (ra->state != SD_RADV_STATE_IDLE) | |
432 | return -EBUSY; | |
433 | ||
434 | ra->ifindex = ifindex; | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
440 | assert_return(ra, -EINVAL); | |
441 | ||
442 | if (ra->state != SD_RADV_STATE_IDLE) | |
443 | return -EBUSY; | |
444 | ||
445 | if (mac_addr) | |
446 | ra->mac_addr = *mac_addr; | |
447 | else | |
448 | zero(ra->mac_addr); | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
454 | assert_return(ra, -EINVAL); | |
455 | assert_return(mtu >= 1280, -EINVAL); | |
456 | ||
204f99d2 PF |
457 | ra->mtu = mtu; |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
463 | assert_return(ra, -EINVAL); | |
464 | ||
465 | if (ra->state != SD_RADV_STATE_IDLE) | |
466 | return -EBUSY; | |
467 | ||
468 | ra->hop_limit = hop_limit; | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
474 | assert_return(ra, -EINVAL); | |
475 | ||
476 | if (ra->state != SD_RADV_STATE_IDLE) | |
477 | return -EBUSY; | |
478 | ||
479 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
480 | preference value MUST be set to (00) by the sender..." */ | |
481 | if (router_lifetime == 0 && | |
482 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
483 | return -ETIME; | |
484 | ||
485 | ra->lifetime = router_lifetime; | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
490 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
491 | assert_return(ra, -EINVAL); | |
492 | ||
493 | if (ra->state != SD_RADV_STATE_IDLE) | |
494 | return -EBUSY; | |
495 | ||
496 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
502 | assert_return(ra, -EINVAL); | |
503 | ||
504 | if (ra->state != SD_RADV_STATE_IDLE) | |
505 | return -EBUSY; | |
506 | ||
507 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
513 | int r = 0; | |
514 | ||
515 | assert_return(ra, -EINVAL); | |
516 | assert_return(IN_SET(preference, | |
517 | SD_NDISC_PREFERENCE_LOW, | |
518 | SD_NDISC_PREFERENCE_MEDIUM, | |
519 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
520 | ||
521 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
522 | ||
523 | return r; | |
524 | } | |
525 | ||
d601b566 | 526 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, bool dynamic) { |
204f99d2 | 527 | sd_radv_prefix *cur; |
d601b566 | 528 | int r; |
204f99d2 | 529 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
530 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
531 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
532 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
533 | |
534 | assert_return(ra, -EINVAL); | |
535 | ||
536 | if (!p) | |
537 | return -EINVAL; | |
538 | ||
539 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
204f99d2 PF |
540 | |
541 | r = in_addr_prefix_intersect(AF_INET6, | |
542 | (union in_addr_union*) &cur->opt.in6_addr, | |
543 | cur->opt.prefixlen, | |
544 | (union in_addr_union*) &p->opt.in6_addr, | |
545 | p->opt.prefixlen); | |
546 | if (r > 0) { | |
547 | _cleanup_free_ char *addr_cur = NULL; | |
548 | ||
204f99d2 PF |
549 | (void) in_addr_to_string(AF_INET6, |
550 | (union in_addr_union*) &p->opt.in6_addr, | |
551 | &addr_p); | |
552 | ||
d601b566 PF |
553 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
554 | goto update; | |
555 | ||
556 | (void) in_addr_to_string(AF_INET6, | |
557 | (union in_addr_union*) &cur->opt.in6_addr, | |
558 | &addr_cur); | |
204f99d2 PF |
559 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", |
560 | addr_cur, cur->opt.prefixlen, | |
561 | addr_p, p->opt.prefixlen); | |
562 | ||
563 | return -EEXIST; | |
564 | } | |
565 | } | |
566 | ||
567 | p = sd_radv_prefix_ref(p); | |
568 | ||
569 | LIST_APPEND(prefix, ra->prefixes, p); | |
570 | ||
571 | ra->n_prefixes++; | |
572 | ||
573 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
d601b566 PF |
574 | |
575 | if (!dynamic) { | |
576 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | cur = p; | |
581 | ||
582 | update: | |
583 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
584 | if (r < 0) | |
585 | return r; | |
586 | ||
587 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
588 | valid_until = usec_add(valid, time_now); | |
589 | if (valid_until == USEC_INFINITY) | |
590 | return -EOVERFLOW; | |
591 | ||
592 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
593 | preferred_until = usec_add(preferred, time_now); | |
594 | if (preferred_until == USEC_INFINITY) | |
595 | return -EOVERFLOW; | |
596 | ||
597 | cur->valid_until = valid_until; | |
598 | cur->preferred_until = preferred_until; | |
599 | ||
600 | log_radv("%s prefix %s/%u preferred %s valid %s", | |
601 | cur? "Updated": "Added", | |
602 | addr_p, p->opt.prefixlen, | |
603 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, | |
604 | preferred, USEC_PER_SEC), | |
605 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
606 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
607 | |
608 | return 0; | |
609 | } | |
610 | ||
34c169c4 | 611 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
612 | const struct in6_addr *prefix, |
613 | unsigned char prefixlen) { | |
34c169c4 PF |
614 | sd_radv_prefix *cur, *next; |
615 | ||
616 | assert_return(ra, NULL); | |
617 | assert_return(prefix, NULL); | |
618 | ||
619 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
620 | if (prefixlen != cur->opt.prefixlen) | |
621 | continue; | |
622 | ||
623 | if (!in_addr_equal(AF_INET6, | |
624 | (union in_addr_union *)prefix, | |
625 | (union in_addr_union *)&cur->opt.in6_addr)) | |
626 | continue; | |
627 | ||
628 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
629 | ra->n_prefixes--; | |
630 | ||
631 | break; | |
632 | } | |
633 | ||
634 | return cur; | |
635 | } | |
636 | ||
e9c6da38 PF |
637 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
638 | const struct in6_addr *dns, size_t n_dns) { | |
639 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
640 | size_t len; | |
641 | ||
642 | assert_return(ra, -EINVAL); | |
643 | assert_return(n_dns < 128, -EINVAL); | |
644 | ||
645 | if (!dns || n_dns == 0) { | |
646 | ra->rdnss = mfree(ra->rdnss); | |
647 | ra->n_rdnss = 0; | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
653 | ||
654 | opt_rdnss = malloc0(len); | |
655 | if (!opt_rdnss) | |
656 | return -ENOMEM; | |
657 | ||
658 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
659 | opt_rdnss->length = len / 8; | |
660 | opt_rdnss->lifetime = htobe32(lifetime); | |
661 | ||
662 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
663 | ||
1cc6c93a | 664 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
665 | |
666 | ra->n_rdnss = n_dns; | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
e965d6ab PF |
671 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
672 | char **search_list) { | |
673 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
674 | size_t len = 0; | |
675 | char **s; | |
676 | uint8_t *p; | |
677 | ||
678 | assert_return(ra, -EINVAL); | |
679 | ||
97d7974b | 680 | if (strv_isempty(search_list)) { |
e965d6ab | 681 | ra->dnssl = mfree(ra->dnssl); |
e965d6ab PF |
682 | return 0; |
683 | } | |
684 | ||
685 | STRV_FOREACH(s, search_list) | |
686 | len += strlen(*s) + 2; | |
687 | ||
688 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
689 | ||
690 | opt_dnssl = malloc0(len); | |
691 | if (!opt_dnssl) | |
692 | return -ENOMEM; | |
693 | ||
694 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
695 | opt_dnssl->length = len / 8; | |
696 | opt_dnssl->lifetime = htobe32(lifetime); | |
697 | ||
698 | p = (uint8_t *)(opt_dnssl + 1); | |
699 | len -= sizeof(struct sd_radv_opt_dns); | |
700 | ||
701 | STRV_FOREACH(s, search_list) { | |
702 | int r; | |
703 | ||
704 | r = dns_name_to_wire_format(*s, p, len, false); | |
705 | if (r < 0) | |
706 | return r; | |
707 | ||
708 | if (len < (size_t)r) | |
709 | return -ENOBUFS; | |
710 | ||
711 | p += r; | |
712 | len -= r; | |
713 | } | |
714 | ||
1cc6c93a | 715 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
716 | |
717 | return 0; | |
718 | } | |
719 | ||
04473969 PF |
720 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
721 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
722 | ||
723 | assert_return(ret, -EINVAL); | |
724 | ||
725 | p = new0(sd_radv_prefix, 1); | |
726 | if (!p) | |
727 | return -ENOMEM; | |
728 | ||
729 | p->n_ref = 1; | |
730 | ||
731 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
732 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
733 | ||
734 | p->opt.prefixlen = 64; | |
735 | ||
736 | /* RFC 4861, Section 6.2.1 */ | |
737 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
738 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
739 | p->opt.preferred_lifetime = htobe32(604800); | |
740 | p->opt.valid_lifetime = htobe32(2592000); | |
741 | ||
204f99d2 PF |
742 | LIST_INIT(prefix, p); |
743 | ||
1cc6c93a | 744 | *ret = TAKE_PTR(p); |
04473969 PF |
745 | |
746 | return 0; | |
747 | } | |
748 | ||
749 | _public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) { | |
750 | if (!p) | |
751 | return NULL; | |
752 | ||
753 | assert(p->n_ref > 0); | |
754 | p->n_ref++; | |
755 | ||
756 | return p; | |
757 | } | |
758 | ||
759 | _public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) { | |
760 | if (!p) | |
761 | return NULL; | |
762 | ||
763 | assert(p->n_ref > 0); | |
764 | p->n_ref--; | |
765 | ||
766 | if (p->n_ref > 0) | |
767 | return NULL; | |
768 | ||
769 | return mfree(p); | |
770 | } | |
771 | ||
f5a5706a | 772 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
773 | unsigned char prefixlen) { |
774 | assert_return(p, -EINVAL); | |
775 | assert_return(in6_addr, -EINVAL); | |
776 | ||
777 | if (prefixlen < 3 || prefixlen > 128) | |
778 | return -EINVAL; | |
779 | ||
780 | if (prefixlen > 64) | |
781 | /* unusual but allowed, log it */ | |
782 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
783 | ||
784 | p->opt.in6_addr = *in6_addr; | |
785 | p->opt.prefixlen = prefixlen; | |
786 | ||
787 | return 0; | |
788 | } | |
789 | ||
790 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
791 | assert_return(p, -EINVAL); | |
792 | ||
793 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
798 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
799 | int address_autoconfiguration) { | |
800 | assert_return(p, -EINVAL); | |
801 | ||
802 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
807 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
808 | uint32_t valid_lifetime) { | |
809 | assert_return(p, -EINVAL); | |
810 | ||
811 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
812 | ||
813 | return 0; | |
814 | } | |
815 | ||
816 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
817 | uint32_t preferred_lifetime) { | |
818 | assert_return(p, -EINVAL); | |
819 | ||
820 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
821 | ||
822 | return 0; | |
823 | } |