]>
Commit | Line | Data |
---|---|---|
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 | 79 | static void radv_reset(sd_radv *ra) { |
c4b6dda0 | 80 | assert(ra); |
204fb681 PF |
81 | |
82 | ra->timeout_event_source = | |
83 | sd_event_source_unref(ra->timeout_event_source); | |
84 | ||
88d5a3db PF |
85 | ra->recv_event_source = |
86 | sd_event_source_unref(ra->recv_event_source); | |
87 | ||
204fb681 PF |
88 | ra->ra_sent = 0; |
89 | } | |
90 | ||
204f99d2 PF |
91 | _public_ sd_radv *sd_radv_ref(sd_radv *ra) { |
92 | if (!ra) | |
93 | return NULL; | |
94 | ||
95 | assert(ra->n_ref > 0); | |
96 | ra->n_ref++; | |
97 | ||
98 | return ra; | |
99 | } | |
100 | ||
101 | _public_ sd_radv *sd_radv_unref(sd_radv *ra) { | |
102 | if (!ra) | |
103 | return NULL; | |
104 | ||
105 | assert(ra->n_ref > 0); | |
106 | ra->n_ref--; | |
107 | ||
108 | if (ra->n_ref > 0) | |
109 | return NULL; | |
110 | ||
111 | while (ra->prefixes) { | |
112 | sd_radv_prefix *p = ra->prefixes; | |
113 | ||
114 | LIST_REMOVE(prefix, ra->prefixes, p); | |
115 | sd_radv_prefix_unref(p); | |
116 | } | |
117 | ||
e9c6da38 | 118 | free(ra->rdnss); |
f9aa5417 | 119 | free(ra->dnssl); |
e9c6da38 | 120 | |
204fb681 PF |
121 | radv_reset(ra); |
122 | ||
204f99d2 | 123 | sd_radv_detach_event(ra); |
c4b6dda0 LP |
124 | |
125 | ra->fd = safe_close(ra->fd); | |
126 | ||
204f99d2 PF |
127 | return mfree(ra); |
128 | } | |
129 | ||
204fb681 PF |
130 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, |
131 | const uint32_t router_lifetime) { | |
77baf5ae PF |
132 | static const struct ether_addr mac_zero = {}; |
133 | sd_radv_prefix *p; | |
134 | struct sockaddr_in6 dst_addr = { | |
135 | .sin6_family = AF_INET6, | |
136 | .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
137 | }; | |
138 | struct nd_router_advert adv = {}; | |
139 | struct { | |
140 | struct nd_opt_hdr opthdr; | |
141 | struct ether_addr slladdr; | |
142 | } _packed_ opt_mac = { | |
143 | .opthdr = { | |
144 | .nd_opt_type = ND_OPT_SOURCE_LINKADDR, | |
145 | .nd_opt_len = (sizeof(struct nd_opt_hdr) + | |
146 | sizeof(struct ether_addr) - 1) /8 + 1, | |
147 | }, | |
148 | }; | |
149 | struct nd_opt_mtu opt_mtu = { | |
150 | .nd_opt_mtu_type = ND_OPT_MTU, | |
151 | .nd_opt_mtu_len = 1, | |
152 | }; | |
6852c0f6 PF |
153 | /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, RDNSS |
154 | and DNSSL */ | |
155 | struct iovec iov[5 + ra->n_prefixes]; | |
77baf5ae PF |
156 | struct msghdr msg = { |
157 | .msg_name = &dst_addr, | |
158 | .msg_namelen = sizeof(dst_addr), | |
159 | .msg_iov = iov, | |
160 | }; | |
d601b566 PF |
161 | usec_t time_now; |
162 | int r; | |
163 | ||
164 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
165 | if (r < 0) | |
166 | return r; | |
77baf5ae | 167 | |
88d5a3db | 168 | if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst)) |
77baf5ae | 169 | dst_addr.sin6_addr = *dst; |
88d5a3db | 170 | |
77baf5ae PF |
171 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
172 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
173 | adv.nd_ra_flags_reserved = ra->flags; | |
174 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
175 | iov[msg.msg_iovlen].iov_base = &adv; | |
176 | iov[msg.msg_iovlen].iov_len = sizeof(adv); | |
177 | msg.msg_iovlen++; | |
178 | ||
179 | /* MAC address is optional, either because the link does not use L2 | |
180 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
181 | if (memcmp(&mac_zero, &ra->mac_addr, sizeof(mac_zero))) { | |
182 | opt_mac.slladdr = ra->mac_addr; | |
183 | iov[msg.msg_iovlen].iov_base = &opt_mac; | |
184 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mac); | |
185 | msg.msg_iovlen++; | |
186 | } | |
187 | ||
188 | if (ra->mtu) { | |
189 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
190 | iov[msg.msg_iovlen].iov_base = &opt_mtu; | |
191 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu); | |
192 | msg.msg_iovlen++; | |
193 | } | |
194 | ||
195 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
196 | if (p->valid_until) { |
197 | ||
198 | if (time_now > p->valid_until) | |
199 | p->opt.valid_lifetime = 0; | |
200 | else | |
201 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
202 | ||
203 | if (time_now > p->preferred_until) | |
204 | p->opt.preferred_lifetime = 0; | |
205 | else | |
206 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
207 | } | |
77baf5ae PF |
208 | iov[msg.msg_iovlen].iov_base = &p->opt; |
209 | iov[msg.msg_iovlen].iov_len = sizeof(p->opt); | |
210 | msg.msg_iovlen++; | |
211 | } | |
212 | ||
e9c6da38 PF |
213 | if (ra->rdnss) { |
214 | iov[msg.msg_iovlen].iov_base = ra->rdnss; | |
215 | iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8; | |
216 | msg.msg_iovlen++; | |
217 | } | |
218 | ||
e965d6ab PF |
219 | if (ra->dnssl) { |
220 | iov[msg.msg_iovlen].iov_base = ra->dnssl; | |
221 | iov[msg.msg_iovlen].iov_len = ra->dnssl->length * 8; | |
222 | msg.msg_iovlen++; | |
223 | } | |
224 | ||
77baf5ae PF |
225 | if (sendmsg(ra->fd, &msg, 0) < 0) |
226 | return -errno; | |
204fb681 | 227 | |
77baf5ae | 228 | return 0; |
204fb681 PF |
229 | } |
230 | ||
88d5a3db PF |
231 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
232 | sd_radv *ra = userdata; | |
233 | _cleanup_free_ char *addr = NULL; | |
234 | struct in6_addr src; | |
235 | triple_timestamp timestamp; | |
236 | int r; | |
237 | ssize_t buflen; | |
238 | _cleanup_free_ char *buf = NULL; | |
239 | ||
240 | assert(s); | |
241 | assert(ra); | |
242 | assert(ra->event); | |
243 | ||
244 | buflen = next_datagram_size_fd(fd); | |
245 | ||
246 | if ((unsigned) buflen < sizeof(struct nd_router_solicit)) | |
247 | return log_radv("Too short packet received"); | |
248 | ||
249 | buf = new0(char, buflen); | |
250 | if (!buf) | |
251 | return 0; | |
252 | ||
253 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
254 | if (r < 0) { | |
255 | switch (r) { | |
256 | case -EADDRNOTAVAIL: | |
257 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
258 | log_radv("Received RS from non-link-local address %s. Ignoring", addr); | |
259 | break; | |
260 | ||
261 | case -EMULTIHOP: | |
262 | log_radv("Received RS with invalid hop limit. Ignoring."); | |
263 | break; | |
264 | ||
265 | case -EPFNOSUPPORT: | |
266 | log_radv("Received invalid source address from ICMPv6 socket. Ignoring."); | |
267 | break; | |
268 | ||
269 | default: | |
270 | log_radv_warning_errno(r, "Error receiving from ICMPv6 socket: %m"); | |
271 | break; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
278 | ||
279 | r = radv_send(ra, &src, ra->lifetime); | |
280 | if (r < 0) | |
281 | log_radv_warning_errno(r, "Unable to send solicited Router Advertisment to %s: %m", addr); | |
282 | else | |
283 | log_radv("Sent solicited Router Advertisement to %s", addr); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
204fb681 PF |
288 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
289 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
290 | ||
291 | return min + (random_u32() % (max - min)); | |
292 | } | |
293 | ||
294 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
295 | int r; | |
296 | sd_radv *ra = userdata; | |
297 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
298 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
299 | usec_t time_now, timeout; | |
300 | char time_string[FORMAT_TIMESPAN_MAX]; | |
301 | ||
302 | assert(s); | |
303 | assert(ra); | |
304 | assert(ra->event); | |
305 | ||
306 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); | |
307 | ||
308 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
309 | if (r < 0) | |
310 | goto fail; | |
311 | ||
312 | r = radv_send(ra, NULL, ra->lifetime); | |
313 | if (r < 0) | |
314 | log_radv_warning_errno(r, "Unable to send Router Advertisement: %m"); | |
315 | ||
316 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
317 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
318 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
319 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
320 | } | |
321 | ||
322 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
323 | ||
324 | log_radv("Next Router Advertisement in %s", | |
325 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
326 | timeout, USEC_PER_SEC)); | |
327 | ||
328 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, | |
329 | clock_boottime_or_monotonic(), | |
330 | time_now + timeout, MSEC_PER_SEC, | |
331 | radv_timeout, ra); | |
332 | if (r < 0) | |
333 | goto fail; | |
334 | ||
335 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
336 | ra->event_priority); | |
337 | if (r < 0) | |
338 | goto fail; | |
339 | ||
340 | r = sd_event_source_set_description(ra->timeout_event_source, | |
341 | "radv-timeout"); | |
342 | if (r < 0) | |
343 | goto fail; | |
344 | ||
345 | ra->ra_sent++; | |
346 | ||
347 | fail: | |
348 | if (r < 0) | |
349 | sd_radv_stop(ra); | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
204f99d2 | 354 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
355 | int r; |
356 | ||
204f99d2 PF |
357 | assert_return(ra, -EINVAL); |
358 | ||
6f8a8b84 SS |
359 | if (ra->state == SD_RADV_STATE_IDLE) |
360 | return 0; | |
361 | ||
204f99d2 PF |
362 | log_radv("Stopping IPv6 Router Advertisement daemon"); |
363 | ||
204fb681 PF |
364 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
365 | with zero lifetime */ | |
366 | r = radv_send(ra, NULL, 0); | |
367 | if (r < 0) | |
368 | log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); | |
369 | ||
370 | radv_reset(ra); | |
77baf5ae | 371 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
372 | ra->state = SD_RADV_STATE_IDLE; |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | _public_ int sd_radv_start(sd_radv *ra) { | |
204fb681 PF |
378 | int r = 0; |
379 | ||
204f99d2 PF |
380 | assert_return(ra, -EINVAL); |
381 | assert_return(ra->event, -EINVAL); | |
382 | assert_return(ra->ifindex > 0, -EINVAL); | |
383 | ||
384 | if (ra->state != SD_RADV_STATE_IDLE) | |
385 | return 0; | |
386 | ||
204fb681 PF |
387 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, |
388 | clock_boottime_or_monotonic(), 0, 0, | |
389 | radv_timeout, ra); | |
390 | if (r < 0) | |
391 | goto fail; | |
392 | ||
393 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
394 | ra->event_priority); | |
395 | if (r < 0) | |
396 | goto fail; | |
397 | ||
398 | (void) sd_event_source_set_description(ra->timeout_event_source, | |
399 | "radv-timeout"); | |
400 | ||
77baf5ae PF |
401 | r = icmp6_bind_router_advertisement(ra->ifindex); |
402 | if (r < 0) | |
403 | goto fail; | |
404 | ||
405 | ra->fd = r; | |
88d5a3db PF |
406 | |
407 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
408 | if (r < 0) | |
409 | goto fail; | |
410 | ||
411 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
412 | if (r < 0) | |
413 | goto fail; | |
414 | ||
415 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 416 | |
204f99d2 PF |
417 | ra->state = SD_RADV_STATE_ADVERTISING; |
418 | ||
419 | log_radv("Started IPv6 Router Advertisement daemon"); | |
420 | ||
421 | return 0; | |
204fb681 PF |
422 | |
423 | fail: | |
424 | radv_reset(ra); | |
425 | ||
426 | return r; | |
204f99d2 PF |
427 | } |
428 | ||
429 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
430 | assert_return(ra, -EINVAL); | |
431 | assert_return(ifindex >= -1, -EINVAL); | |
432 | ||
433 | if (ra->state != SD_RADV_STATE_IDLE) | |
434 | return -EBUSY; | |
435 | ||
436 | ra->ifindex = ifindex; | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
441 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
442 | assert_return(ra, -EINVAL); | |
443 | ||
444 | if (ra->state != SD_RADV_STATE_IDLE) | |
445 | return -EBUSY; | |
446 | ||
447 | if (mac_addr) | |
448 | ra->mac_addr = *mac_addr; | |
449 | else | |
450 | zero(ra->mac_addr); | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
456 | assert_return(ra, -EINVAL); | |
457 | assert_return(mtu >= 1280, -EINVAL); | |
458 | ||
204f99d2 PF |
459 | ra->mtu = mtu; |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
465 | assert_return(ra, -EINVAL); | |
466 | ||
467 | if (ra->state != SD_RADV_STATE_IDLE) | |
468 | return -EBUSY; | |
469 | ||
470 | ra->hop_limit = hop_limit; | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
476 | assert_return(ra, -EINVAL); | |
477 | ||
478 | if (ra->state != SD_RADV_STATE_IDLE) | |
479 | return -EBUSY; | |
480 | ||
481 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
482 | preference value MUST be set to (00) by the sender..." */ | |
483 | if (router_lifetime == 0 && | |
484 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
485 | return -ETIME; | |
486 | ||
487 | ra->lifetime = router_lifetime; | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
493 | assert_return(ra, -EINVAL); | |
494 | ||
495 | if (ra->state != SD_RADV_STATE_IDLE) | |
496 | return -EBUSY; | |
497 | ||
498 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
503 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
504 | assert_return(ra, -EINVAL); | |
505 | ||
506 | if (ra->state != SD_RADV_STATE_IDLE) | |
507 | return -EBUSY; | |
508 | ||
509 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
515 | int r = 0; | |
516 | ||
517 | assert_return(ra, -EINVAL); | |
518 | assert_return(IN_SET(preference, | |
519 | SD_NDISC_PREFERENCE_LOW, | |
520 | SD_NDISC_PREFERENCE_MEDIUM, | |
521 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
522 | ||
523 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
524 | ||
525 | return r; | |
526 | } | |
527 | ||
d601b566 | 528 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, bool dynamic) { |
204f99d2 | 529 | sd_radv_prefix *cur; |
d601b566 | 530 | int r; |
204f99d2 | 531 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
532 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
533 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
534 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
535 | |
536 | assert_return(ra, -EINVAL); | |
537 | ||
538 | if (!p) | |
539 | return -EINVAL; | |
540 | ||
541 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
204f99d2 PF |
542 | |
543 | r = in_addr_prefix_intersect(AF_INET6, | |
544 | (union in_addr_union*) &cur->opt.in6_addr, | |
545 | cur->opt.prefixlen, | |
546 | (union in_addr_union*) &p->opt.in6_addr, | |
547 | p->opt.prefixlen); | |
548 | if (r > 0) { | |
549 | _cleanup_free_ char *addr_cur = NULL; | |
550 | ||
204f99d2 PF |
551 | (void) in_addr_to_string(AF_INET6, |
552 | (union in_addr_union*) &p->opt.in6_addr, | |
553 | &addr_p); | |
554 | ||
d601b566 PF |
555 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
556 | goto update; | |
557 | ||
558 | (void) in_addr_to_string(AF_INET6, | |
559 | (union in_addr_union*) &cur->opt.in6_addr, | |
560 | &addr_cur); | |
204f99d2 PF |
561 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", |
562 | addr_cur, cur->opt.prefixlen, | |
563 | addr_p, p->opt.prefixlen); | |
564 | ||
565 | return -EEXIST; | |
566 | } | |
567 | } | |
568 | ||
569 | p = sd_radv_prefix_ref(p); | |
570 | ||
571 | LIST_APPEND(prefix, ra->prefixes, p); | |
572 | ||
573 | ra->n_prefixes++; | |
574 | ||
575 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
d601b566 PF |
576 | |
577 | if (!dynamic) { | |
578 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
579 | return 0; | |
580 | } | |
581 | ||
582 | cur = p; | |
583 | ||
584 | update: | |
585 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
586 | if (r < 0) | |
587 | return r; | |
588 | ||
589 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
590 | valid_until = usec_add(valid, time_now); | |
591 | if (valid_until == USEC_INFINITY) | |
592 | return -EOVERFLOW; | |
593 | ||
594 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
595 | preferred_until = usec_add(preferred, time_now); | |
596 | if (preferred_until == USEC_INFINITY) | |
597 | return -EOVERFLOW; | |
598 | ||
599 | cur->valid_until = valid_until; | |
600 | cur->preferred_until = preferred_until; | |
601 | ||
602 | log_radv("%s prefix %s/%u preferred %s valid %s", | |
603 | cur? "Updated": "Added", | |
604 | addr_p, p->opt.prefixlen, | |
605 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, | |
606 | preferred, USEC_PER_SEC), | |
607 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
608 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
609 | |
610 | return 0; | |
611 | } | |
612 | ||
34c169c4 | 613 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
614 | const struct in6_addr *prefix, |
615 | unsigned char prefixlen) { | |
34c169c4 PF |
616 | sd_radv_prefix *cur, *next; |
617 | ||
618 | assert_return(ra, NULL); | |
619 | assert_return(prefix, NULL); | |
620 | ||
621 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
622 | if (prefixlen != cur->opt.prefixlen) | |
623 | continue; | |
624 | ||
625 | if (!in_addr_equal(AF_INET6, | |
626 | (union in_addr_union *)prefix, | |
627 | (union in_addr_union *)&cur->opt.in6_addr)) | |
628 | continue; | |
629 | ||
630 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
631 | ra->n_prefixes--; | |
632 | ||
633 | break; | |
634 | } | |
635 | ||
636 | return cur; | |
637 | } | |
638 | ||
e9c6da38 PF |
639 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
640 | const struct in6_addr *dns, size_t n_dns) { | |
641 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
642 | size_t len; | |
643 | ||
644 | assert_return(ra, -EINVAL); | |
645 | assert_return(n_dns < 128, -EINVAL); | |
646 | ||
647 | if (!dns || n_dns == 0) { | |
648 | ra->rdnss = mfree(ra->rdnss); | |
649 | ra->n_rdnss = 0; | |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
655 | ||
656 | opt_rdnss = malloc0(len); | |
657 | if (!opt_rdnss) | |
658 | return -ENOMEM; | |
659 | ||
660 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
661 | opt_rdnss->length = len / 8; | |
662 | opt_rdnss->lifetime = htobe32(lifetime); | |
663 | ||
664 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
665 | ||
1cc6c93a | 666 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
667 | |
668 | ra->n_rdnss = n_dns; | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
e965d6ab PF |
673 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
674 | char **search_list) { | |
675 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
676 | size_t len = 0; | |
677 | char **s; | |
678 | uint8_t *p; | |
679 | ||
680 | assert_return(ra, -EINVAL); | |
681 | ||
682 | if (!search_list || *search_list == NULL) { | |
683 | ra->dnssl = mfree(ra->dnssl); | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
688 | STRV_FOREACH(s, search_list) | |
689 | len += strlen(*s) + 2; | |
690 | ||
691 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
692 | ||
693 | opt_dnssl = malloc0(len); | |
694 | if (!opt_dnssl) | |
695 | return -ENOMEM; | |
696 | ||
697 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
698 | opt_dnssl->length = len / 8; | |
699 | opt_dnssl->lifetime = htobe32(lifetime); | |
700 | ||
701 | p = (uint8_t *)(opt_dnssl + 1); | |
702 | len -= sizeof(struct sd_radv_opt_dns); | |
703 | ||
704 | STRV_FOREACH(s, search_list) { | |
705 | int r; | |
706 | ||
707 | r = dns_name_to_wire_format(*s, p, len, false); | |
708 | if (r < 0) | |
709 | return r; | |
710 | ||
711 | if (len < (size_t)r) | |
712 | return -ENOBUFS; | |
713 | ||
714 | p += r; | |
715 | len -= r; | |
716 | } | |
717 | ||
1cc6c93a | 718 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
719 | |
720 | return 0; | |
721 | } | |
722 | ||
04473969 PF |
723 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
724 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
725 | ||
726 | assert_return(ret, -EINVAL); | |
727 | ||
728 | p = new0(sd_radv_prefix, 1); | |
729 | if (!p) | |
730 | return -ENOMEM; | |
731 | ||
732 | p->n_ref = 1; | |
733 | ||
734 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
735 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
736 | ||
737 | p->opt.prefixlen = 64; | |
738 | ||
739 | /* RFC 4861, Section 6.2.1 */ | |
740 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
741 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
742 | p->opt.preferred_lifetime = htobe32(604800); | |
743 | p->opt.valid_lifetime = htobe32(2592000); | |
744 | ||
204f99d2 PF |
745 | LIST_INIT(prefix, p); |
746 | ||
1cc6c93a | 747 | *ret = TAKE_PTR(p); |
04473969 PF |
748 | |
749 | return 0; | |
750 | } | |
751 | ||
752 | _public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) { | |
753 | if (!p) | |
754 | return NULL; | |
755 | ||
756 | assert(p->n_ref > 0); | |
757 | p->n_ref++; | |
758 | ||
759 | return p; | |
760 | } | |
761 | ||
762 | _public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) { | |
763 | if (!p) | |
764 | return NULL; | |
765 | ||
766 | assert(p->n_ref > 0); | |
767 | p->n_ref--; | |
768 | ||
769 | if (p->n_ref > 0) | |
770 | return NULL; | |
771 | ||
772 | return mfree(p); | |
773 | } | |
774 | ||
f5a5706a | 775 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
776 | unsigned char prefixlen) { |
777 | assert_return(p, -EINVAL); | |
778 | assert_return(in6_addr, -EINVAL); | |
779 | ||
780 | if (prefixlen < 3 || prefixlen > 128) | |
781 | return -EINVAL; | |
782 | ||
783 | if (prefixlen > 64) | |
784 | /* unusual but allowed, log it */ | |
785 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
786 | ||
787 | p->opt.in6_addr = *in6_addr; | |
788 | p->opt.prefixlen = prefixlen; | |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
793 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
794 | assert_return(p, -EINVAL); | |
795 | ||
796 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
802 | int address_autoconfiguration) { | |
803 | assert_return(p, -EINVAL); | |
804 | ||
805 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
810 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
811 | uint32_t valid_lifetime) { | |
812 | assert_return(p, -EINVAL); | |
813 | ||
814 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
820 | uint32_t preferred_lifetime) { | |
821 | assert_return(p, -EINVAL); | |
822 | ||
823 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
824 | ||
825 | return 0; | |
826 | } |