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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" |
807a8ede | 15 | #include "event-util.h" |
04473969 PF |
16 | #include "fd-util.h" |
17 | #include "icmp6-util.h" | |
18 | #include "in-addr-util.h" | |
19 | #include "radv-internal.h" | |
20 | #include "socket-util.h" | |
21 | #include "string-util.h" | |
e965d6ab | 22 | #include "strv.h" |
04473969 | 23 | #include "util.h" |
204fb681 | 24 | #include "random-util.h" |
04473969 | 25 | |
204f99d2 PF |
26 | _public_ int sd_radv_new(sd_radv **ret) { |
27 | _cleanup_(sd_radv_unrefp) sd_radv *ra = NULL; | |
28 | ||
29 | assert_return(ret, -EINVAL); | |
30 | ||
78f9d24f | 31 | ra = new(sd_radv, 1); |
204f99d2 PF |
32 | if (!ra) |
33 | return -ENOMEM; | |
34 | ||
78f9d24f YW |
35 | *ra = (sd_radv) { |
36 | .n_ref = 1, | |
37 | .fd = -1, | |
38 | }; | |
204f99d2 | 39 | |
1cc6c93a | 40 | *ret = TAKE_PTR(ra); |
204f99d2 PF |
41 | |
42 | return 0; | |
43 | } | |
44 | ||
45 | _public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) { | |
46 | int r; | |
47 | ||
48 | assert_return(ra, -EINVAL); | |
49 | assert_return(!ra->event, -EBUSY); | |
50 | ||
51 | if (event) | |
52 | ra->event = sd_event_ref(event); | |
53 | else { | |
54 | r = sd_event_default(&ra->event); | |
55 | if (r < 0) | |
56 | return 0; | |
57 | } | |
58 | ||
59 | ra->event_priority = priority; | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | _public_ int sd_radv_detach_event(sd_radv *ra) { | |
65 | ||
66 | assert_return(ra, -EINVAL); | |
67 | ||
68 | ra->event = sd_event_unref(ra->event); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | _public_ sd_event *sd_radv_get_event(sd_radv *ra) { | |
73 | assert_return(ra, NULL); | |
74 | ||
75 | return ra->event; | |
76 | } | |
77 | ||
204fb681 | 78 | static void radv_reset(sd_radv *ra) { |
c4b6dda0 | 79 | assert(ra); |
204fb681 | 80 | |
807a8ede | 81 | (void) event_source_disable(ra->timeout_event_source); |
204fb681 | 82 | |
88d5a3db PF |
83 | ra->recv_event_source = |
84 | sd_event_source_unref(ra->recv_event_source); | |
85 | ||
204fb681 PF |
86 | ra->ra_sent = 0; |
87 | } | |
88 | ||
8301aa0b YW |
89 | static sd_radv *radv_free(sd_radv *ra) { |
90 | assert(ra); | |
204f99d2 PF |
91 | |
92 | while (ra->prefixes) { | |
93 | sd_radv_prefix *p = ra->prefixes; | |
94 | ||
95 | LIST_REMOVE(prefix, ra->prefixes, p); | |
96 | sd_radv_prefix_unref(p); | |
97 | } | |
98 | ||
e9c6da38 | 99 | free(ra->rdnss); |
f9aa5417 | 100 | free(ra->dnssl); |
e9c6da38 | 101 | |
807a8ede YW |
102 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); |
103 | ||
204fb681 PF |
104 | radv_reset(ra); |
105 | ||
204f99d2 | 106 | sd_radv_detach_event(ra); |
c4b6dda0 LP |
107 | |
108 | ra->fd = safe_close(ra->fd); | |
109 | ||
204f99d2 PF |
110 | return mfree(ra); |
111 | } | |
112 | ||
8301aa0b YW |
113 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv, sd_radv, radv_free); |
114 | ||
204fb681 PF |
115 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, |
116 | const uint32_t router_lifetime) { | |
77baf5ae PF |
117 | static const struct ether_addr mac_zero = {}; |
118 | sd_radv_prefix *p; | |
119 | struct sockaddr_in6 dst_addr = { | |
120 | .sin6_family = AF_INET6, | |
121 | .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
122 | }; | |
123 | struct nd_router_advert adv = {}; | |
124 | struct { | |
125 | struct nd_opt_hdr opthdr; | |
126 | struct ether_addr slladdr; | |
127 | } _packed_ opt_mac = { | |
128 | .opthdr = { | |
129 | .nd_opt_type = ND_OPT_SOURCE_LINKADDR, | |
130 | .nd_opt_len = (sizeof(struct nd_opt_hdr) + | |
131 | sizeof(struct ether_addr) - 1) /8 + 1, | |
132 | }, | |
133 | }; | |
134 | struct nd_opt_mtu opt_mtu = { | |
135 | .nd_opt_mtu_type = ND_OPT_MTU, | |
136 | .nd_opt_mtu_len = 1, | |
137 | }; | |
6852c0f6 PF |
138 | /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, RDNSS |
139 | and DNSSL */ | |
140 | struct iovec iov[5 + ra->n_prefixes]; | |
77baf5ae PF |
141 | struct msghdr msg = { |
142 | .msg_name = &dst_addr, | |
143 | .msg_namelen = sizeof(dst_addr), | |
144 | .msg_iov = iov, | |
145 | }; | |
d601b566 PF |
146 | usec_t time_now; |
147 | int r; | |
148 | ||
149 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
150 | if (r < 0) | |
151 | return r; | |
77baf5ae | 152 | |
88d5a3db | 153 | if (dst && !in_addr_is_null(AF_INET6, (union in_addr_union*) dst)) |
77baf5ae | 154 | dst_addr.sin6_addr = *dst; |
88d5a3db | 155 | |
77baf5ae PF |
156 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
157 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
158 | adv.nd_ra_flags_reserved = ra->flags; | |
159 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
160 | iov[msg.msg_iovlen].iov_base = &adv; | |
161 | iov[msg.msg_iovlen].iov_len = sizeof(adv); | |
162 | msg.msg_iovlen++; | |
163 | ||
164 | /* MAC address is optional, either because the link does not use L2 | |
165 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
166 | if (memcmp(&mac_zero, &ra->mac_addr, sizeof(mac_zero))) { | |
167 | opt_mac.slladdr = ra->mac_addr; | |
168 | iov[msg.msg_iovlen].iov_base = &opt_mac; | |
169 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mac); | |
170 | msg.msg_iovlen++; | |
171 | } | |
172 | ||
173 | if (ra->mtu) { | |
174 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
175 | iov[msg.msg_iovlen].iov_base = &opt_mtu; | |
176 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu); | |
177 | msg.msg_iovlen++; | |
178 | } | |
179 | ||
180 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
181 | if (p->valid_until) { |
182 | ||
183 | if (time_now > p->valid_until) | |
184 | p->opt.valid_lifetime = 0; | |
185 | else | |
186 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
187 | ||
188 | if (time_now > p->preferred_until) | |
189 | p->opt.preferred_lifetime = 0; | |
190 | else | |
191 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
192 | } | |
77baf5ae PF |
193 | iov[msg.msg_iovlen].iov_base = &p->opt; |
194 | iov[msg.msg_iovlen].iov_len = sizeof(p->opt); | |
195 | msg.msg_iovlen++; | |
196 | } | |
197 | ||
e9c6da38 PF |
198 | if (ra->rdnss) { |
199 | iov[msg.msg_iovlen].iov_base = ra->rdnss; | |
200 | iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8; | |
201 | msg.msg_iovlen++; | |
202 | } | |
203 | ||
e965d6ab PF |
204 | if (ra->dnssl) { |
205 | iov[msg.msg_iovlen].iov_base = ra->dnssl; | |
206 | iov[msg.msg_iovlen].iov_len = ra->dnssl->length * 8; | |
207 | msg.msg_iovlen++; | |
208 | } | |
209 | ||
77baf5ae PF |
210 | if (sendmsg(ra->fd, &msg, 0) < 0) |
211 | return -errno; | |
204fb681 | 212 | |
77baf5ae | 213 | return 0; |
204fb681 PF |
214 | } |
215 | ||
88d5a3db PF |
216 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
217 | sd_radv *ra = userdata; | |
218 | _cleanup_free_ char *addr = NULL; | |
219 | struct in6_addr src; | |
220 | triple_timestamp timestamp; | |
221 | int r; | |
222 | ssize_t buflen; | |
223 | _cleanup_free_ char *buf = NULL; | |
224 | ||
225 | assert(s); | |
226 | assert(ra); | |
227 | assert(ra->event); | |
228 | ||
229 | buflen = next_datagram_size_fd(fd); | |
230 | ||
231 | if ((unsigned) buflen < sizeof(struct nd_router_solicit)) | |
232 | return log_radv("Too short packet received"); | |
233 | ||
234 | buf = new0(char, buflen); | |
235 | if (!buf) | |
236 | return 0; | |
237 | ||
238 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
239 | if (r < 0) { | |
240 | switch (r) { | |
241 | case -EADDRNOTAVAIL: | |
242 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
243 | log_radv("Received RS from non-link-local address %s. Ignoring", addr); | |
244 | break; | |
245 | ||
246 | case -EMULTIHOP: | |
247 | log_radv("Received RS with invalid hop limit. Ignoring."); | |
248 | break; | |
249 | ||
250 | case -EPFNOSUPPORT: | |
251 | log_radv("Received invalid source address from ICMPv6 socket. Ignoring."); | |
252 | break; | |
253 | ||
8eb41f4c LP |
254 | case -EAGAIN: /* ignore spurious wakeups */ |
255 | break; | |
256 | ||
88d5a3db | 257 | default: |
8eb41f4c | 258 | log_radv_errno(r, "Unexpected error receiving from ICMPv6 socket: %m"); |
88d5a3db PF |
259 | break; |
260 | } | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
266 | ||
267 | r = radv_send(ra, &src, ra->lifetime); | |
268 | if (r < 0) | |
fdc2afc1 | 269 | log_radv_errno(r, "Unable to send solicited Router Advertisement to %s: %m", addr); |
88d5a3db PF |
270 | else |
271 | log_radv("Sent solicited Router Advertisement to %s", addr); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
204fb681 PF |
276 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
277 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
278 | ||
279 | return min + (random_u32() % (max - min)); | |
280 | } | |
281 | ||
282 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
283 | int r; | |
284 | sd_radv *ra = userdata; | |
285 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
286 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
287 | usec_t time_now, timeout; | |
288 | char time_string[FORMAT_TIMESPAN_MAX]; | |
289 | ||
290 | assert(s); | |
291 | assert(ra); | |
292 | assert(ra->event); | |
293 | ||
204fb681 PF |
294 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
295 | if (r < 0) | |
296 | goto fail; | |
297 | ||
298 | r = radv_send(ra, NULL, ra->lifetime); | |
299 | if (r < 0) | |
fdc2afc1 | 300 | log_radv_errno(r, "Unable to send Router Advertisement: %m"); |
204fb681 PF |
301 | |
302 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
303 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
304 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
305 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
306 | } | |
307 | ||
308 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
309 | ||
310 | log_radv("Next Router Advertisement in %s", | |
311 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
312 | timeout, USEC_PER_SEC)); | |
313 | ||
807a8ede YW |
314 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
315 | clock_boottime_or_monotonic(), | |
316 | time_now + timeout, MSEC_PER_SEC, | |
317 | radv_timeout, ra, | |
318 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
319 | if (r < 0) |
320 | goto fail; | |
321 | ||
322 | ra->ra_sent++; | |
323 | ||
807a8ede YW |
324 | return 0; |
325 | ||
204fb681 | 326 | fail: |
807a8ede | 327 | sd_radv_stop(ra); |
204fb681 PF |
328 | |
329 | return 0; | |
330 | } | |
331 | ||
204f99d2 | 332 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
333 | int r; |
334 | ||
204f99d2 PF |
335 | assert_return(ra, -EINVAL); |
336 | ||
6f8a8b84 SS |
337 | if (ra->state == SD_RADV_STATE_IDLE) |
338 | return 0; | |
339 | ||
204f99d2 PF |
340 | log_radv("Stopping IPv6 Router Advertisement daemon"); |
341 | ||
204fb681 PF |
342 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
343 | with zero lifetime */ | |
344 | r = radv_send(ra, NULL, 0); | |
345 | if (r < 0) | |
fdc2afc1 | 346 | log_radv_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); |
204fb681 PF |
347 | |
348 | radv_reset(ra); | |
77baf5ae | 349 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
350 | ra->state = SD_RADV_STATE_IDLE; |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | _public_ int sd_radv_start(sd_radv *ra) { | |
204fb681 PF |
356 | int r = 0; |
357 | ||
204f99d2 PF |
358 | assert_return(ra, -EINVAL); |
359 | assert_return(ra->event, -EINVAL); | |
360 | assert_return(ra->ifindex > 0, -EINVAL); | |
361 | ||
362 | if (ra->state != SD_RADV_STATE_IDLE) | |
363 | return 0; | |
364 | ||
807a8ede YW |
365 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
366 | clock_boottime_or_monotonic(), | |
367 | 0, 0, | |
368 | radv_timeout, ra, | |
369 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
370 | if (r < 0) |
371 | goto fail; | |
372 | ||
77baf5ae PF |
373 | r = icmp6_bind_router_advertisement(ra->ifindex); |
374 | if (r < 0) | |
375 | goto fail; | |
376 | ||
377 | ra->fd = r; | |
88d5a3db PF |
378 | |
379 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
380 | if (r < 0) | |
381 | goto fail; | |
382 | ||
383 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
384 | if (r < 0) | |
385 | goto fail; | |
386 | ||
387 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 388 | |
204f99d2 PF |
389 | ra->state = SD_RADV_STATE_ADVERTISING; |
390 | ||
391 | log_radv("Started IPv6 Router Advertisement daemon"); | |
392 | ||
393 | return 0; | |
204fb681 PF |
394 | |
395 | fail: | |
396 | radv_reset(ra); | |
397 | ||
398 | return r; | |
204f99d2 PF |
399 | } |
400 | ||
401 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
402 | assert_return(ra, -EINVAL); | |
403 | assert_return(ifindex >= -1, -EINVAL); | |
404 | ||
405 | if (ra->state != SD_RADV_STATE_IDLE) | |
406 | return -EBUSY; | |
407 | ||
408 | ra->ifindex = ifindex; | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
414 | assert_return(ra, -EINVAL); | |
415 | ||
416 | if (ra->state != SD_RADV_STATE_IDLE) | |
417 | return -EBUSY; | |
418 | ||
419 | if (mac_addr) | |
420 | ra->mac_addr = *mac_addr; | |
421 | else | |
422 | zero(ra->mac_addr); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
428 | assert_return(ra, -EINVAL); | |
429 | assert_return(mtu >= 1280, -EINVAL); | |
430 | ||
204f99d2 PF |
431 | ra->mtu = mtu; |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
437 | assert_return(ra, -EINVAL); | |
438 | ||
439 | if (ra->state != SD_RADV_STATE_IDLE) | |
440 | return -EBUSY; | |
441 | ||
442 | ra->hop_limit = hop_limit; | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
448 | assert_return(ra, -EINVAL); | |
449 | ||
450 | if (ra->state != SD_RADV_STATE_IDLE) | |
451 | return -EBUSY; | |
452 | ||
453 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
454 | preference value MUST be set to (00) by the sender..." */ | |
455 | if (router_lifetime == 0 && | |
456 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
457 | return -ETIME; | |
458 | ||
459 | ra->lifetime = router_lifetime; | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
465 | assert_return(ra, -EINVAL); | |
466 | ||
467 | if (ra->state != SD_RADV_STATE_IDLE) | |
468 | return -EBUSY; | |
469 | ||
470 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
476 | assert_return(ra, -EINVAL); | |
477 | ||
478 | if (ra->state != SD_RADV_STATE_IDLE) | |
479 | return -EBUSY; | |
480 | ||
481 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
487 | int r = 0; | |
488 | ||
489 | assert_return(ra, -EINVAL); | |
490 | assert_return(IN_SET(preference, | |
491 | SD_NDISC_PREFERENCE_LOW, | |
492 | SD_NDISC_PREFERENCE_MEDIUM, | |
493 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
494 | ||
495 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
496 | ||
497 | return r; | |
498 | } | |
499 | ||
d601b566 | 500 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, bool dynamic) { |
204f99d2 | 501 | sd_radv_prefix *cur; |
d601b566 | 502 | int r; |
204f99d2 | 503 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
504 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
505 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
506 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
507 | |
508 | assert_return(ra, -EINVAL); | |
509 | ||
510 | if (!p) | |
511 | return -EINVAL; | |
512 | ||
513 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
204f99d2 PF |
514 | |
515 | r = in_addr_prefix_intersect(AF_INET6, | |
516 | (union in_addr_union*) &cur->opt.in6_addr, | |
517 | cur->opt.prefixlen, | |
518 | (union in_addr_union*) &p->opt.in6_addr, | |
519 | p->opt.prefixlen); | |
520 | if (r > 0) { | |
521 | _cleanup_free_ char *addr_cur = NULL; | |
522 | ||
204f99d2 PF |
523 | (void) in_addr_to_string(AF_INET6, |
524 | (union in_addr_union*) &p->opt.in6_addr, | |
525 | &addr_p); | |
526 | ||
d601b566 PF |
527 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
528 | goto update; | |
529 | ||
530 | (void) in_addr_to_string(AF_INET6, | |
531 | (union in_addr_union*) &cur->opt.in6_addr, | |
532 | &addr_cur); | |
204f99d2 PF |
533 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", |
534 | addr_cur, cur->opt.prefixlen, | |
535 | addr_p, p->opt.prefixlen); | |
536 | ||
537 | return -EEXIST; | |
538 | } | |
539 | } | |
540 | ||
541 | p = sd_radv_prefix_ref(p); | |
542 | ||
543 | LIST_APPEND(prefix, ra->prefixes, p); | |
544 | ||
545 | ra->n_prefixes++; | |
546 | ||
547 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
d601b566 PF |
548 | |
549 | if (!dynamic) { | |
550 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | cur = p; | |
555 | ||
556 | update: | |
557 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
558 | if (r < 0) | |
559 | return r; | |
560 | ||
561 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
562 | valid_until = usec_add(valid, time_now); | |
563 | if (valid_until == USEC_INFINITY) | |
564 | return -EOVERFLOW; | |
565 | ||
566 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
567 | preferred_until = usec_add(preferred, time_now); | |
568 | if (preferred_until == USEC_INFINITY) | |
569 | return -EOVERFLOW; | |
570 | ||
571 | cur->valid_until = valid_until; | |
572 | cur->preferred_until = preferred_until; | |
573 | ||
574 | log_radv("%s prefix %s/%u preferred %s valid %s", | |
575 | cur? "Updated": "Added", | |
576 | addr_p, p->opt.prefixlen, | |
577 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, | |
578 | preferred, USEC_PER_SEC), | |
579 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
580 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
581 | |
582 | return 0; | |
583 | } | |
584 | ||
34c169c4 | 585 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
586 | const struct in6_addr *prefix, |
587 | unsigned char prefixlen) { | |
34c169c4 PF |
588 | sd_radv_prefix *cur, *next; |
589 | ||
590 | assert_return(ra, NULL); | |
591 | assert_return(prefix, NULL); | |
592 | ||
593 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
594 | if (prefixlen != cur->opt.prefixlen) | |
595 | continue; | |
596 | ||
597 | if (!in_addr_equal(AF_INET6, | |
598 | (union in_addr_union *)prefix, | |
599 | (union in_addr_union *)&cur->opt.in6_addr)) | |
600 | continue; | |
601 | ||
602 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
603 | ra->n_prefixes--; | |
604 | ||
605 | break; | |
606 | } | |
607 | ||
608 | return cur; | |
609 | } | |
610 | ||
e9c6da38 PF |
611 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
612 | const struct in6_addr *dns, size_t n_dns) { | |
613 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
614 | size_t len; | |
615 | ||
616 | assert_return(ra, -EINVAL); | |
617 | assert_return(n_dns < 128, -EINVAL); | |
618 | ||
619 | if (!dns || n_dns == 0) { | |
620 | ra->rdnss = mfree(ra->rdnss); | |
621 | ra->n_rdnss = 0; | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
626 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
627 | ||
628 | opt_rdnss = malloc0(len); | |
629 | if (!opt_rdnss) | |
630 | return -ENOMEM; | |
631 | ||
632 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
633 | opt_rdnss->length = len / 8; | |
634 | opt_rdnss->lifetime = htobe32(lifetime); | |
635 | ||
636 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
637 | ||
1cc6c93a | 638 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
639 | |
640 | ra->n_rdnss = n_dns; | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
e965d6ab PF |
645 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
646 | char **search_list) { | |
647 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
648 | size_t len = 0; | |
649 | char **s; | |
650 | uint8_t *p; | |
651 | ||
652 | assert_return(ra, -EINVAL); | |
653 | ||
97d7974b | 654 | if (strv_isempty(search_list)) { |
e965d6ab | 655 | ra->dnssl = mfree(ra->dnssl); |
e965d6ab PF |
656 | return 0; |
657 | } | |
658 | ||
659 | STRV_FOREACH(s, search_list) | |
660 | len += strlen(*s) + 2; | |
661 | ||
662 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
663 | ||
664 | opt_dnssl = malloc0(len); | |
665 | if (!opt_dnssl) | |
666 | return -ENOMEM; | |
667 | ||
668 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
669 | opt_dnssl->length = len / 8; | |
670 | opt_dnssl->lifetime = htobe32(lifetime); | |
671 | ||
672 | p = (uint8_t *)(opt_dnssl + 1); | |
673 | len -= sizeof(struct sd_radv_opt_dns); | |
674 | ||
675 | STRV_FOREACH(s, search_list) { | |
676 | int r; | |
677 | ||
678 | r = dns_name_to_wire_format(*s, p, len, false); | |
679 | if (r < 0) | |
680 | return r; | |
681 | ||
682 | if (len < (size_t)r) | |
683 | return -ENOBUFS; | |
684 | ||
685 | p += r; | |
686 | len -= r; | |
687 | } | |
688 | ||
1cc6c93a | 689 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
690 | |
691 | return 0; | |
692 | } | |
693 | ||
04473969 PF |
694 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
695 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
696 | ||
697 | assert_return(ret, -EINVAL); | |
698 | ||
699 | p = new0(sd_radv_prefix, 1); | |
700 | if (!p) | |
701 | return -ENOMEM; | |
702 | ||
703 | p->n_ref = 1; | |
704 | ||
705 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
706 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
707 | ||
708 | p->opt.prefixlen = 64; | |
709 | ||
710 | /* RFC 4861, Section 6.2.1 */ | |
711 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
712 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
713 | p->opt.preferred_lifetime = htobe32(604800); | |
714 | p->opt.valid_lifetime = htobe32(2592000); | |
715 | ||
204f99d2 PF |
716 | LIST_INIT(prefix, p); |
717 | ||
1cc6c93a | 718 | *ret = TAKE_PTR(p); |
04473969 PF |
719 | |
720 | return 0; | |
721 | } | |
722 | ||
8301aa0b | 723 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree); |
04473969 | 724 | |
f5a5706a | 725 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
726 | unsigned char prefixlen) { |
727 | assert_return(p, -EINVAL); | |
728 | assert_return(in6_addr, -EINVAL); | |
729 | ||
730 | if (prefixlen < 3 || prefixlen > 128) | |
731 | return -EINVAL; | |
732 | ||
733 | if (prefixlen > 64) | |
734 | /* unusual but allowed, log it */ | |
735 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
736 | ||
737 | p->opt.in6_addr = *in6_addr; | |
738 | p->opt.prefixlen = prefixlen; | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
743 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
744 | assert_return(p, -EINVAL); | |
745 | ||
746 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
751 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
752 | int address_autoconfiguration) { | |
753 | assert_return(p, -EINVAL); | |
754 | ||
755 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
760 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
761 | uint32_t valid_lifetime) { | |
762 | assert_return(p, -EINVAL); | |
763 | ||
764 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
765 | ||
766 | return 0; | |
767 | } | |
768 | ||
769 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
770 | uint32_t preferred_lifetime) { | |
771 | assert_return(p, -EINVAL); | |
772 | ||
773 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
774 | ||
775 | return 0; | |
776 | } |