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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 | ||
6f8a8b84 SS |
355 | if (ra->state == SD_RADV_STATE_IDLE) |
356 | return 0; | |
357 | ||
204f99d2 PF |
358 | log_radv("Stopping IPv6 Router Advertisement daemon"); |
359 | ||
204fb681 PF |
360 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
361 | with zero lifetime */ | |
362 | r = radv_send(ra, NULL, 0); | |
363 | if (r < 0) | |
364 | log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); | |
365 | ||
366 | radv_reset(ra); | |
77baf5ae | 367 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
368 | ra->state = SD_RADV_STATE_IDLE; |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | _public_ int sd_radv_start(sd_radv *ra) { | |
204fb681 PF |
374 | int r = 0; |
375 | ||
204f99d2 PF |
376 | assert_return(ra, -EINVAL); |
377 | assert_return(ra->event, -EINVAL); | |
378 | assert_return(ra->ifindex > 0, -EINVAL); | |
379 | ||
380 | if (ra->state != SD_RADV_STATE_IDLE) | |
381 | return 0; | |
382 | ||
204fb681 PF |
383 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, |
384 | clock_boottime_or_monotonic(), 0, 0, | |
385 | radv_timeout, ra); | |
386 | if (r < 0) | |
387 | goto fail; | |
388 | ||
389 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
390 | ra->event_priority); | |
391 | if (r < 0) | |
392 | goto fail; | |
393 | ||
394 | (void) sd_event_source_set_description(ra->timeout_event_source, | |
395 | "radv-timeout"); | |
396 | ||
77baf5ae PF |
397 | r = icmp6_bind_router_advertisement(ra->ifindex); |
398 | if (r < 0) | |
399 | goto fail; | |
400 | ||
401 | ra->fd = r; | |
88d5a3db PF |
402 | |
403 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
404 | if (r < 0) | |
405 | goto fail; | |
406 | ||
407 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
408 | if (r < 0) | |
409 | goto fail; | |
410 | ||
411 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 412 | |
204f99d2 PF |
413 | ra->state = SD_RADV_STATE_ADVERTISING; |
414 | ||
415 | log_radv("Started IPv6 Router Advertisement daemon"); | |
416 | ||
417 | return 0; | |
204fb681 PF |
418 | |
419 | fail: | |
420 | radv_reset(ra); | |
421 | ||
422 | return r; | |
204f99d2 PF |
423 | } |
424 | ||
425 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
426 | assert_return(ra, -EINVAL); | |
427 | assert_return(ifindex >= -1, -EINVAL); | |
428 | ||
429 | if (ra->state != SD_RADV_STATE_IDLE) | |
430 | return -EBUSY; | |
431 | ||
432 | ra->ifindex = ifindex; | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
438 | assert_return(ra, -EINVAL); | |
439 | ||
440 | if (ra->state != SD_RADV_STATE_IDLE) | |
441 | return -EBUSY; | |
442 | ||
443 | if (mac_addr) | |
444 | ra->mac_addr = *mac_addr; | |
445 | else | |
446 | zero(ra->mac_addr); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
452 | assert_return(ra, -EINVAL); | |
453 | assert_return(mtu >= 1280, -EINVAL); | |
454 | ||
204f99d2 PF |
455 | ra->mtu = mtu; |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
461 | assert_return(ra, -EINVAL); | |
462 | ||
463 | if (ra->state != SD_RADV_STATE_IDLE) | |
464 | return -EBUSY; | |
465 | ||
466 | ra->hop_limit = hop_limit; | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
471 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
472 | assert_return(ra, -EINVAL); | |
473 | ||
474 | if (ra->state != SD_RADV_STATE_IDLE) | |
475 | return -EBUSY; | |
476 | ||
477 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
478 | preference value MUST be set to (00) by the sender..." */ | |
479 | if (router_lifetime == 0 && | |
480 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
481 | return -ETIME; | |
482 | ||
483 | ra->lifetime = router_lifetime; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
489 | assert_return(ra, -EINVAL); | |
490 | ||
491 | if (ra->state != SD_RADV_STATE_IDLE) | |
492 | return -EBUSY; | |
493 | ||
494 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
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_OTHER, other); | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
511 | int r = 0; | |
512 | ||
513 | assert_return(ra, -EINVAL); | |
514 | assert_return(IN_SET(preference, | |
515 | SD_NDISC_PREFERENCE_LOW, | |
516 | SD_NDISC_PREFERENCE_MEDIUM, | |
517 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
518 | ||
519 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
520 | ||
521 | return r; | |
522 | } | |
523 | ||
d601b566 | 524 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, bool dynamic) { |
204f99d2 | 525 | sd_radv_prefix *cur; |
d601b566 | 526 | int r; |
204f99d2 | 527 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
528 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
529 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
530 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
531 | |
532 | assert_return(ra, -EINVAL); | |
533 | ||
534 | if (!p) | |
535 | return -EINVAL; | |
536 | ||
537 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
204f99d2 PF |
538 | |
539 | r = in_addr_prefix_intersect(AF_INET6, | |
540 | (union in_addr_union*) &cur->opt.in6_addr, | |
541 | cur->opt.prefixlen, | |
542 | (union in_addr_union*) &p->opt.in6_addr, | |
543 | p->opt.prefixlen); | |
544 | if (r > 0) { | |
545 | _cleanup_free_ char *addr_cur = NULL; | |
546 | ||
204f99d2 PF |
547 | (void) in_addr_to_string(AF_INET6, |
548 | (union in_addr_union*) &p->opt.in6_addr, | |
549 | &addr_p); | |
550 | ||
d601b566 PF |
551 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
552 | goto update; | |
553 | ||
554 | (void) in_addr_to_string(AF_INET6, | |
555 | (union in_addr_union*) &cur->opt.in6_addr, | |
556 | &addr_cur); | |
204f99d2 PF |
557 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", |
558 | addr_cur, cur->opt.prefixlen, | |
559 | addr_p, p->opt.prefixlen); | |
560 | ||
561 | return -EEXIST; | |
562 | } | |
563 | } | |
564 | ||
565 | p = sd_radv_prefix_ref(p); | |
566 | ||
567 | LIST_APPEND(prefix, ra->prefixes, p); | |
568 | ||
569 | ra->n_prefixes++; | |
570 | ||
571 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
d601b566 PF |
572 | |
573 | if (!dynamic) { | |
574 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | cur = p; | |
579 | ||
580 | update: | |
581 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
582 | if (r < 0) | |
583 | return r; | |
584 | ||
585 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
586 | valid_until = usec_add(valid, time_now); | |
587 | if (valid_until == USEC_INFINITY) | |
588 | return -EOVERFLOW; | |
589 | ||
590 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
591 | preferred_until = usec_add(preferred, time_now); | |
592 | if (preferred_until == USEC_INFINITY) | |
593 | return -EOVERFLOW; | |
594 | ||
595 | cur->valid_until = valid_until; | |
596 | cur->preferred_until = preferred_until; | |
597 | ||
598 | log_radv("%s prefix %s/%u preferred %s valid %s", | |
599 | cur? "Updated": "Added", | |
600 | addr_p, p->opt.prefixlen, | |
601 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, | |
602 | preferred, USEC_PER_SEC), | |
603 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
604 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
605 | |
606 | return 0; | |
607 | } | |
608 | ||
34c169c4 PF |
609 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
610 | struct in6_addr *prefix, | |
611 | uint8_t prefixlen) { | |
612 | sd_radv_prefix *cur, *next; | |
613 | ||
614 | assert_return(ra, NULL); | |
615 | assert_return(prefix, NULL); | |
616 | ||
617 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
618 | if (prefixlen != cur->opt.prefixlen) | |
619 | continue; | |
620 | ||
621 | if (!in_addr_equal(AF_INET6, | |
622 | (union in_addr_union *)prefix, | |
623 | (union in_addr_union *)&cur->opt.in6_addr)) | |
624 | continue; | |
625 | ||
626 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
627 | ra->n_prefixes--; | |
628 | ||
629 | break; | |
630 | } | |
631 | ||
632 | return cur; | |
633 | } | |
634 | ||
e9c6da38 PF |
635 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
636 | const struct in6_addr *dns, size_t n_dns) { | |
637 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
638 | size_t len; | |
639 | ||
640 | assert_return(ra, -EINVAL); | |
641 | assert_return(n_dns < 128, -EINVAL); | |
642 | ||
643 | if (!dns || n_dns == 0) { | |
644 | ra->rdnss = mfree(ra->rdnss); | |
645 | ra->n_rdnss = 0; | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
651 | ||
652 | opt_rdnss = malloc0(len); | |
653 | if (!opt_rdnss) | |
654 | return -ENOMEM; | |
655 | ||
656 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
657 | opt_rdnss->length = len / 8; | |
658 | opt_rdnss->lifetime = htobe32(lifetime); | |
659 | ||
660 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
661 | ||
1cc6c93a | 662 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
663 | |
664 | ra->n_rdnss = n_dns; | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
e965d6ab PF |
669 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
670 | char **search_list) { | |
671 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
672 | size_t len = 0; | |
673 | char **s; | |
674 | uint8_t *p; | |
675 | ||
676 | assert_return(ra, -EINVAL); | |
677 | ||
678 | if (!search_list || *search_list == NULL) { | |
679 | ra->dnssl = mfree(ra->dnssl); | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | STRV_FOREACH(s, search_list) | |
685 | len += strlen(*s) + 2; | |
686 | ||
687 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
688 | ||
689 | opt_dnssl = malloc0(len); | |
690 | if (!opt_dnssl) | |
691 | return -ENOMEM; | |
692 | ||
693 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
694 | opt_dnssl->length = len / 8; | |
695 | opt_dnssl->lifetime = htobe32(lifetime); | |
696 | ||
697 | p = (uint8_t *)(opt_dnssl + 1); | |
698 | len -= sizeof(struct sd_radv_opt_dns); | |
699 | ||
700 | STRV_FOREACH(s, search_list) { | |
701 | int r; | |
702 | ||
703 | r = dns_name_to_wire_format(*s, p, len, false); | |
704 | if (r < 0) | |
705 | return r; | |
706 | ||
707 | if (len < (size_t)r) | |
708 | return -ENOBUFS; | |
709 | ||
710 | p += r; | |
711 | len -= r; | |
712 | } | |
713 | ||
1cc6c93a | 714 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
04473969 PF |
719 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
720 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
721 | ||
722 | assert_return(ret, -EINVAL); | |
723 | ||
724 | p = new0(sd_radv_prefix, 1); | |
725 | if (!p) | |
726 | return -ENOMEM; | |
727 | ||
728 | p->n_ref = 1; | |
729 | ||
730 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
731 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
732 | ||
733 | p->opt.prefixlen = 64; | |
734 | ||
735 | /* RFC 4861, Section 6.2.1 */ | |
736 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
737 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
738 | p->opt.preferred_lifetime = htobe32(604800); | |
739 | p->opt.valid_lifetime = htobe32(2592000); | |
740 | ||
204f99d2 PF |
741 | LIST_INIT(prefix, p); |
742 | ||
1cc6c93a | 743 | *ret = TAKE_PTR(p); |
04473969 PF |
744 | |
745 | return 0; | |
746 | } | |
747 | ||
748 | _public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) { | |
749 | if (!p) | |
750 | return NULL; | |
751 | ||
752 | assert(p->n_ref > 0); | |
753 | p->n_ref++; | |
754 | ||
755 | return p; | |
756 | } | |
757 | ||
758 | _public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) { | |
759 | if (!p) | |
760 | return NULL; | |
761 | ||
762 | assert(p->n_ref > 0); | |
763 | p->n_ref--; | |
764 | ||
765 | if (p->n_ref > 0) | |
766 | return NULL; | |
767 | ||
768 | return mfree(p); | |
769 | } | |
770 | ||
771 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, struct in6_addr *in6_addr, | |
772 | unsigned char prefixlen) { | |
773 | assert_return(p, -EINVAL); | |
774 | assert_return(in6_addr, -EINVAL); | |
775 | ||
776 | if (prefixlen < 3 || prefixlen > 128) | |
777 | return -EINVAL; | |
778 | ||
779 | if (prefixlen > 64) | |
780 | /* unusual but allowed, log it */ | |
781 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
782 | ||
783 | p->opt.in6_addr = *in6_addr; | |
784 | p->opt.prefixlen = prefixlen; | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
789 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
790 | assert_return(p, -EINVAL); | |
791 | ||
792 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
797 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
798 | int address_autoconfiguration) { | |
799 | assert_return(p, -EINVAL); | |
800 | ||
801 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
806 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
807 | uint32_t valid_lifetime) { | |
808 | assert_return(p, -EINVAL); | |
809 | ||
810 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
815 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
816 | uint32_t preferred_lifetime) { | |
817 | assert_return(p, -EINVAL); | |
818 | ||
819 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
820 | ||
821 | return 0; | |
822 | } |