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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" |
ae25915d | 15 | #include "ether-addr-util.h" |
807a8ede | 16 | #include "event-util.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 | ||
78f9d24f | 32 | ra = new(sd_radv, 1); |
204f99d2 PF |
33 | if (!ra) |
34 | return -ENOMEM; | |
35 | ||
78f9d24f YW |
36 | *ra = (sd_radv) { |
37 | .n_ref = 1, | |
38 | .fd = -1, | |
39 | }; | |
204f99d2 | 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 | 81 | |
807a8ede | 82 | (void) event_source_disable(ra->timeout_event_source); |
204fb681 | 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 | ||
8301aa0b YW |
90 | static sd_radv *radv_free(sd_radv *ra) { |
91 | assert(ra); | |
204f99d2 PF |
92 | |
93 | while (ra->prefixes) { | |
94 | sd_radv_prefix *p = ra->prefixes; | |
95 | ||
96 | LIST_REMOVE(prefix, ra->prefixes, p); | |
97 | sd_radv_prefix_unref(p); | |
98 | } | |
99 | ||
e9c6da38 | 100 | free(ra->rdnss); |
f9aa5417 | 101 | free(ra->dnssl); |
e9c6da38 | 102 | |
807a8ede YW |
103 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); |
104 | ||
204fb681 PF |
105 | radv_reset(ra); |
106 | ||
204f99d2 | 107 | sd_radv_detach_event(ra); |
c4b6dda0 LP |
108 | |
109 | ra->fd = safe_close(ra->fd); | |
110 | ||
204f99d2 PF |
111 | return mfree(ra); |
112 | } | |
113 | ||
8301aa0b YW |
114 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv, sd_radv, radv_free); |
115 | ||
83ef9d14 | 116 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, uint32_t router_lifetime) { |
77baf5ae PF |
117 | sd_radv_prefix *p; |
118 | struct sockaddr_in6 dst_addr = { | |
119 | .sin6_family = AF_INET6, | |
120 | .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
121 | }; | |
122 | struct nd_router_advert adv = {}; | |
123 | struct { | |
124 | struct nd_opt_hdr opthdr; | |
125 | struct ether_addr slladdr; | |
126 | } _packed_ opt_mac = { | |
127 | .opthdr = { | |
128 | .nd_opt_type = ND_OPT_SOURCE_LINKADDR, | |
129 | .nd_opt_len = (sizeof(struct nd_opt_hdr) + | |
130 | sizeof(struct ether_addr) - 1) /8 + 1, | |
131 | }, | |
132 | }; | |
133 | struct nd_opt_mtu opt_mtu = { | |
134 | .nd_opt_mtu_type = ND_OPT_MTU, | |
135 | .nd_opt_mtu_len = 1, | |
136 | }; | |
6852c0f6 PF |
137 | /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, RDNSS |
138 | and DNSSL */ | |
139 | struct iovec iov[5 + ra->n_prefixes]; | |
77baf5ae PF |
140 | struct msghdr msg = { |
141 | .msg_name = &dst_addr, | |
142 | .msg_namelen = sizeof(dst_addr), | |
143 | .msg_iov = iov, | |
144 | }; | |
d601b566 PF |
145 | usec_t time_now; |
146 | int r; | |
147 | ||
148 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
149 | if (r < 0) | |
150 | return r; | |
77baf5ae | 151 | |
88d5a3db | 152 | if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst)) |
77baf5ae | 153 | dst_addr.sin6_addr = *dst; |
88d5a3db | 154 | |
77baf5ae PF |
155 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
156 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
157 | adv.nd_ra_flags_reserved = ra->flags; | |
158 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
159 | iov[msg.msg_iovlen].iov_base = &adv; | |
160 | iov[msg.msg_iovlen].iov_len = sizeof(adv); | |
161 | msg.msg_iovlen++; | |
162 | ||
163 | /* MAC address is optional, either because the link does not use L2 | |
164 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
ae25915d | 165 | if (!ether_addr_is_null(&ra->mac_addr)) { |
77baf5ae PF |
166 | opt_mac.slladdr = ra->mac_addr; |
167 | iov[msg.msg_iovlen].iov_base = &opt_mac; | |
168 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mac); | |
169 | msg.msg_iovlen++; | |
170 | } | |
171 | ||
172 | if (ra->mtu) { | |
173 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
174 | iov[msg.msg_iovlen].iov_base = &opt_mtu; | |
175 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu); | |
176 | msg.msg_iovlen++; | |
177 | } | |
178 | ||
179 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
180 | if (p->valid_until) { |
181 | ||
182 | if (time_now > p->valid_until) | |
183 | p->opt.valid_lifetime = 0; | |
184 | else | |
185 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
186 | ||
187 | if (time_now > p->preferred_until) | |
188 | p->opt.preferred_lifetime = 0; | |
189 | else | |
190 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
191 | } | |
77baf5ae PF |
192 | iov[msg.msg_iovlen].iov_base = &p->opt; |
193 | iov[msg.msg_iovlen].iov_len = sizeof(p->opt); | |
194 | msg.msg_iovlen++; | |
195 | } | |
196 | ||
e9c6da38 PF |
197 | if (ra->rdnss) { |
198 | iov[msg.msg_iovlen].iov_base = ra->rdnss; | |
199 | iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8; | |
200 | msg.msg_iovlen++; | |
201 | } | |
202 | ||
e965d6ab PF |
203 | if (ra->dnssl) { |
204 | iov[msg.msg_iovlen].iov_base = ra->dnssl; | |
205 | iov[msg.msg_iovlen].iov_len = ra->dnssl->length * 8; | |
206 | msg.msg_iovlen++; | |
207 | } | |
208 | ||
77baf5ae PF |
209 | if (sendmsg(ra->fd, &msg, 0) < 0) |
210 | return -errno; | |
204fb681 | 211 | |
77baf5ae | 212 | return 0; |
204fb681 PF |
213 | } |
214 | ||
88d5a3db PF |
215 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
216 | sd_radv *ra = userdata; | |
217 | _cleanup_free_ char *addr = NULL; | |
218 | struct in6_addr src; | |
219 | triple_timestamp timestamp; | |
220 | int r; | |
221 | ssize_t buflen; | |
222 | _cleanup_free_ char *buf = NULL; | |
223 | ||
224 | assert(s); | |
225 | assert(ra); | |
226 | assert(ra->event); | |
227 | ||
228 | buflen = next_datagram_size_fd(fd); | |
229 | ||
230 | if ((unsigned) buflen < sizeof(struct nd_router_solicit)) | |
231 | return log_radv("Too short packet received"); | |
232 | ||
233 | buf = new0(char, buflen); | |
234 | if (!buf) | |
235 | return 0; | |
236 | ||
237 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
238 | if (r < 0) { | |
239 | switch (r) { | |
240 | case -EADDRNOTAVAIL: | |
241 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
242 | log_radv("Received RS from non-link-local address %s. Ignoring", addr); | |
243 | break; | |
244 | ||
245 | case -EMULTIHOP: | |
246 | log_radv("Received RS with invalid hop limit. Ignoring."); | |
247 | break; | |
248 | ||
249 | case -EPFNOSUPPORT: | |
250 | log_radv("Received invalid source address from ICMPv6 socket. Ignoring."); | |
251 | break; | |
252 | ||
8eb41f4c LP |
253 | case -EAGAIN: /* ignore spurious wakeups */ |
254 | break; | |
255 | ||
88d5a3db | 256 | default: |
8eb41f4c | 257 | log_radv_errno(r, "Unexpected error receiving from ICMPv6 socket: %m"); |
88d5a3db PF |
258 | break; |
259 | } | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
265 | ||
266 | r = radv_send(ra, &src, ra->lifetime); | |
267 | if (r < 0) | |
fdc2afc1 | 268 | log_radv_errno(r, "Unable to send solicited Router Advertisement to %s: %m", addr); |
88d5a3db PF |
269 | else |
270 | log_radv("Sent solicited Router Advertisement to %s", addr); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
204fb681 PF |
275 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
276 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
277 | ||
278 | return min + (random_u32() % (max - min)); | |
279 | } | |
280 | ||
281 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
282 | int r; | |
283 | sd_radv *ra = userdata; | |
284 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
285 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
286 | usec_t time_now, timeout; | |
287 | char time_string[FORMAT_TIMESPAN_MAX]; | |
288 | ||
289 | assert(s); | |
290 | assert(ra); | |
291 | assert(ra->event); | |
292 | ||
204fb681 PF |
293 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
294 | if (r < 0) | |
295 | goto fail; | |
296 | ||
297 | r = radv_send(ra, NULL, ra->lifetime); | |
298 | if (r < 0) | |
fdc2afc1 | 299 | log_radv_errno(r, "Unable to send Router Advertisement: %m"); |
204fb681 PF |
300 | |
301 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
302 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
303 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
304 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
305 | } | |
306 | ||
307 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
308 | ||
309 | log_radv("Next Router Advertisement in %s", | |
310 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
311 | timeout, USEC_PER_SEC)); | |
312 | ||
807a8ede YW |
313 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
314 | clock_boottime_or_monotonic(), | |
315 | time_now + timeout, MSEC_PER_SEC, | |
316 | radv_timeout, ra, | |
317 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
318 | if (r < 0) |
319 | goto fail; | |
320 | ||
321 | ra->ra_sent++; | |
322 | ||
807a8ede YW |
323 | return 0; |
324 | ||
204fb681 | 325 | fail: |
807a8ede | 326 | sd_radv_stop(ra); |
204fb681 PF |
327 | |
328 | return 0; | |
329 | } | |
330 | ||
204f99d2 | 331 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
332 | int r; |
333 | ||
204f99d2 PF |
334 | assert_return(ra, -EINVAL); |
335 | ||
6f8a8b84 SS |
336 | if (ra->state == SD_RADV_STATE_IDLE) |
337 | return 0; | |
338 | ||
204f99d2 PF |
339 | log_radv("Stopping IPv6 Router Advertisement daemon"); |
340 | ||
204fb681 PF |
341 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
342 | with zero lifetime */ | |
343 | r = radv_send(ra, NULL, 0); | |
344 | if (r < 0) | |
fdc2afc1 | 345 | log_radv_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); |
204fb681 PF |
346 | |
347 | radv_reset(ra); | |
77baf5ae | 348 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
349 | ra->state = SD_RADV_STATE_IDLE; |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | _public_ int sd_radv_start(sd_radv *ra) { | |
204fb681 PF |
355 | int r = 0; |
356 | ||
204f99d2 PF |
357 | assert_return(ra, -EINVAL); |
358 | assert_return(ra->event, -EINVAL); | |
359 | assert_return(ra->ifindex > 0, -EINVAL); | |
360 | ||
361 | if (ra->state != SD_RADV_STATE_IDLE) | |
362 | return 0; | |
363 | ||
807a8ede YW |
364 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
365 | clock_boottime_or_monotonic(), | |
366 | 0, 0, | |
367 | radv_timeout, ra, | |
368 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
369 | if (r < 0) |
370 | goto fail; | |
371 | ||
77baf5ae PF |
372 | r = icmp6_bind_router_advertisement(ra->ifindex); |
373 | if (r < 0) | |
374 | goto fail; | |
375 | ||
376 | ra->fd = r; | |
88d5a3db PF |
377 | |
378 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
379 | if (r < 0) | |
380 | goto fail; | |
381 | ||
382 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
383 | if (r < 0) | |
384 | goto fail; | |
385 | ||
386 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 387 | |
204f99d2 PF |
388 | ra->state = SD_RADV_STATE_ADVERTISING; |
389 | ||
390 | log_radv("Started IPv6 Router Advertisement daemon"); | |
391 | ||
392 | return 0; | |
204fb681 PF |
393 | |
394 | fail: | |
395 | radv_reset(ra); | |
396 | ||
397 | return r; | |
204f99d2 PF |
398 | } |
399 | ||
400 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
401 | assert_return(ra, -EINVAL); | |
402 | assert_return(ifindex >= -1, -EINVAL); | |
403 | ||
404 | if (ra->state != SD_RADV_STATE_IDLE) | |
405 | return -EBUSY; | |
406 | ||
407 | ra->ifindex = ifindex; | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
413 | assert_return(ra, -EINVAL); | |
414 | ||
415 | if (ra->state != SD_RADV_STATE_IDLE) | |
416 | return -EBUSY; | |
417 | ||
418 | if (mac_addr) | |
419 | ra->mac_addr = *mac_addr; | |
420 | else | |
421 | zero(ra->mac_addr); | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
427 | assert_return(ra, -EINVAL); | |
428 | assert_return(mtu >= 1280, -EINVAL); | |
429 | ||
204f99d2 PF |
430 | ra->mtu = mtu; |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
436 | assert_return(ra, -EINVAL); | |
437 | ||
438 | if (ra->state != SD_RADV_STATE_IDLE) | |
439 | return -EBUSY; | |
440 | ||
441 | ra->hop_limit = hop_limit; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
447 | assert_return(ra, -EINVAL); | |
448 | ||
449 | if (ra->state != SD_RADV_STATE_IDLE) | |
450 | return -EBUSY; | |
451 | ||
452 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
453 | preference value MUST be set to (00) by the sender..." */ | |
454 | if (router_lifetime == 0 && | |
455 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
456 | return -ETIME; | |
457 | ||
458 | ra->lifetime = router_lifetime; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
464 | assert_return(ra, -EINVAL); | |
465 | ||
466 | if (ra->state != SD_RADV_STATE_IDLE) | |
467 | return -EBUSY; | |
468 | ||
469 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
475 | assert_return(ra, -EINVAL); | |
476 | ||
477 | if (ra->state != SD_RADV_STATE_IDLE) | |
478 | return -EBUSY; | |
479 | ||
480 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
486 | int r = 0; | |
487 | ||
488 | assert_return(ra, -EINVAL); | |
489 | assert_return(IN_SET(preference, | |
490 | SD_NDISC_PREFERENCE_LOW, | |
491 | SD_NDISC_PREFERENCE_MEDIUM, | |
492 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
493 | ||
494 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
495 | ||
496 | return r; | |
497 | } | |
498 | ||
d601b566 | 499 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, bool dynamic) { |
204f99d2 | 500 | sd_radv_prefix *cur; |
d601b566 | 501 | int r; |
204f99d2 | 502 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
503 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
504 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
505 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
506 | |
507 | assert_return(ra, -EINVAL); | |
508 | ||
509 | if (!p) | |
510 | return -EINVAL; | |
511 | ||
512 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
204f99d2 PF |
513 | |
514 | r = in_addr_prefix_intersect(AF_INET6, | |
515 | (union in_addr_union*) &cur->opt.in6_addr, | |
516 | cur->opt.prefixlen, | |
517 | (union in_addr_union*) &p->opt.in6_addr, | |
518 | p->opt.prefixlen); | |
519 | if (r > 0) { | |
520 | _cleanup_free_ char *addr_cur = NULL; | |
521 | ||
204f99d2 PF |
522 | (void) in_addr_to_string(AF_INET6, |
523 | (union in_addr_union*) &p->opt.in6_addr, | |
524 | &addr_p); | |
525 | ||
d601b566 PF |
526 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
527 | goto update; | |
528 | ||
529 | (void) in_addr_to_string(AF_INET6, | |
530 | (union in_addr_union*) &cur->opt.in6_addr, | |
531 | &addr_cur); | |
204f99d2 PF |
532 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", |
533 | addr_cur, cur->opt.prefixlen, | |
534 | addr_p, p->opt.prefixlen); | |
535 | ||
536 | return -EEXIST; | |
537 | } | |
538 | } | |
539 | ||
540 | p = sd_radv_prefix_ref(p); | |
541 | ||
542 | LIST_APPEND(prefix, ra->prefixes, p); | |
543 | ||
544 | ra->n_prefixes++; | |
545 | ||
546 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
d601b566 PF |
547 | |
548 | if (!dynamic) { | |
549 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
550 | return 0; | |
551 | } | |
552 | ||
553 | cur = p; | |
554 | ||
555 | update: | |
556 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
557 | if (r < 0) | |
558 | return r; | |
559 | ||
560 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
561 | valid_until = usec_add(valid, time_now); | |
562 | if (valid_until == USEC_INFINITY) | |
563 | return -EOVERFLOW; | |
564 | ||
565 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
566 | preferred_until = usec_add(preferred, time_now); | |
567 | if (preferred_until == USEC_INFINITY) | |
568 | return -EOVERFLOW; | |
569 | ||
570 | cur->valid_until = valid_until; | |
571 | cur->preferred_until = preferred_until; | |
572 | ||
573 | log_radv("%s prefix %s/%u preferred %s valid %s", | |
574 | cur? "Updated": "Added", | |
575 | addr_p, p->opt.prefixlen, | |
576 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, | |
577 | preferred, USEC_PER_SEC), | |
578 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
579 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
580 | |
581 | return 0; | |
582 | } | |
583 | ||
34c169c4 | 584 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
585 | const struct in6_addr *prefix, |
586 | unsigned char prefixlen) { | |
34c169c4 PF |
587 | sd_radv_prefix *cur, *next; |
588 | ||
589 | assert_return(ra, NULL); | |
590 | assert_return(prefix, NULL); | |
591 | ||
592 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
593 | if (prefixlen != cur->opt.prefixlen) | |
594 | continue; | |
595 | ||
596 | if (!in_addr_equal(AF_INET6, | |
597 | (union in_addr_union *)prefix, | |
598 | (union in_addr_union *)&cur->opt.in6_addr)) | |
599 | continue; | |
600 | ||
601 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
602 | ra->n_prefixes--; | |
603 | ||
604 | break; | |
605 | } | |
606 | ||
607 | return cur; | |
608 | } | |
609 | ||
e9c6da38 PF |
610 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
611 | const struct in6_addr *dns, size_t n_dns) { | |
612 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
613 | size_t len; | |
614 | ||
615 | assert_return(ra, -EINVAL); | |
616 | assert_return(n_dns < 128, -EINVAL); | |
617 | ||
618 | if (!dns || n_dns == 0) { | |
619 | ra->rdnss = mfree(ra->rdnss); | |
620 | ra->n_rdnss = 0; | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
625 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
626 | ||
627 | opt_rdnss = malloc0(len); | |
628 | if (!opt_rdnss) | |
629 | return -ENOMEM; | |
630 | ||
631 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
632 | opt_rdnss->length = len / 8; | |
633 | opt_rdnss->lifetime = htobe32(lifetime); | |
634 | ||
635 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
636 | ||
1cc6c93a | 637 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
638 | |
639 | ra->n_rdnss = n_dns; | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
e965d6ab PF |
644 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
645 | char **search_list) { | |
646 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
647 | size_t len = 0; | |
648 | char **s; | |
649 | uint8_t *p; | |
650 | ||
651 | assert_return(ra, -EINVAL); | |
652 | ||
97d7974b | 653 | if (strv_isempty(search_list)) { |
e965d6ab | 654 | ra->dnssl = mfree(ra->dnssl); |
e965d6ab PF |
655 | return 0; |
656 | } | |
657 | ||
658 | STRV_FOREACH(s, search_list) | |
659 | len += strlen(*s) + 2; | |
660 | ||
661 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
662 | ||
663 | opt_dnssl = malloc0(len); | |
664 | if (!opt_dnssl) | |
665 | return -ENOMEM; | |
666 | ||
667 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
668 | opt_dnssl->length = len / 8; | |
669 | opt_dnssl->lifetime = htobe32(lifetime); | |
670 | ||
671 | p = (uint8_t *)(opt_dnssl + 1); | |
672 | len -= sizeof(struct sd_radv_opt_dns); | |
673 | ||
674 | STRV_FOREACH(s, search_list) { | |
675 | int r; | |
676 | ||
677 | r = dns_name_to_wire_format(*s, p, len, false); | |
678 | if (r < 0) | |
679 | return r; | |
680 | ||
681 | if (len < (size_t)r) | |
682 | return -ENOBUFS; | |
683 | ||
684 | p += r; | |
685 | len -= r; | |
686 | } | |
687 | ||
1cc6c93a | 688 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
689 | |
690 | return 0; | |
691 | } | |
692 | ||
04473969 PF |
693 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
694 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
695 | ||
696 | assert_return(ret, -EINVAL); | |
697 | ||
698 | p = new0(sd_radv_prefix, 1); | |
699 | if (!p) | |
700 | return -ENOMEM; | |
701 | ||
702 | p->n_ref = 1; | |
703 | ||
704 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
705 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
706 | ||
707 | p->opt.prefixlen = 64; | |
708 | ||
709 | /* RFC 4861, Section 6.2.1 */ | |
710 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
711 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
712 | p->opt.preferred_lifetime = htobe32(604800); | |
713 | p->opt.valid_lifetime = htobe32(2592000); | |
714 | ||
204f99d2 PF |
715 | LIST_INIT(prefix, p); |
716 | ||
1cc6c93a | 717 | *ret = TAKE_PTR(p); |
04473969 PF |
718 | |
719 | return 0; | |
720 | } | |
721 | ||
8301aa0b | 722 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree); |
04473969 | 723 | |
f5a5706a | 724 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
725 | unsigned char prefixlen) { |
726 | assert_return(p, -EINVAL); | |
727 | assert_return(in6_addr, -EINVAL); | |
728 | ||
729 | if (prefixlen < 3 || prefixlen > 128) | |
730 | return -EINVAL; | |
731 | ||
732 | if (prefixlen > 64) | |
733 | /* unusual but allowed, log it */ | |
734 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
735 | ||
736 | p->opt.in6_addr = *in6_addr; | |
737 | p->opt.prefixlen = prefixlen; | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
742 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
743 | assert_return(p, -EINVAL); | |
744 | ||
745 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
750 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
751 | int address_autoconfiguration) { | |
752 | assert_return(p, -EINVAL); | |
753 | ||
754 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
759 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
760 | uint32_t valid_lifetime) { | |
761 | assert_return(p, -EINVAL); | |
762 | ||
763 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
764 | ||
765 | return 0; | |
766 | } | |
767 | ||
768 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
769 | uint32_t preferred_lifetime) { | |
770 | assert_return(p, -EINVAL); | |
771 | ||
772 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
773 | ||
774 | return 0; | |
775 | } |