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