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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 | 90 | static sd_radv *radv_free(sd_radv *ra) { |
e866e17b LP |
91 | if (!ra) |
92 | return NULL; | |
204f99d2 PF |
93 | |
94 | while (ra->prefixes) { | |
95 | sd_radv_prefix *p = ra->prefixes; | |
96 | ||
97 | LIST_REMOVE(prefix, ra->prefixes, p); | |
98 | sd_radv_prefix_unref(p); | |
99 | } | |
100 | ||
e9c6da38 | 101 | free(ra->rdnss); |
f9aa5417 | 102 | free(ra->dnssl); |
e9c6da38 | 103 | |
807a8ede YW |
104 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); |
105 | ||
204fb681 PF |
106 | radv_reset(ra); |
107 | ||
204f99d2 | 108 | sd_radv_detach_event(ra); |
c4b6dda0 LP |
109 | |
110 | ra->fd = safe_close(ra->fd); | |
111 | ||
204f99d2 PF |
112 | return mfree(ra); |
113 | } | |
114 | ||
8301aa0b YW |
115 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv, sd_radv, radv_free); |
116 | ||
83ef9d14 | 117 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, uint32_t router_lifetime) { |
77baf5ae PF |
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 | ||
dc0ec5e2 LP |
149 | assert(ra); |
150 | ||
d601b566 PF |
151 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
152 | if (r < 0) | |
153 | return r; | |
77baf5ae | 154 | |
dc0ec5e2 | 155 | if (dst && !IN6_IS_ADDR_UNSPECIFIED(dst)) |
77baf5ae | 156 | dst_addr.sin6_addr = *dst; |
88d5a3db | 157 | |
77baf5ae PF |
158 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
159 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
160 | adv.nd_ra_flags_reserved = ra->flags; | |
161 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
162 | iov[msg.msg_iovlen].iov_base = &adv; | |
163 | iov[msg.msg_iovlen].iov_len = sizeof(adv); | |
164 | msg.msg_iovlen++; | |
165 | ||
166 | /* MAC address is optional, either because the link does not use L2 | |
167 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
ae25915d | 168 | if (!ether_addr_is_null(&ra->mac_addr)) { |
77baf5ae PF |
169 | opt_mac.slladdr = ra->mac_addr; |
170 | iov[msg.msg_iovlen].iov_base = &opt_mac; | |
171 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mac); | |
172 | msg.msg_iovlen++; | |
173 | } | |
174 | ||
175 | if (ra->mtu) { | |
176 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
177 | iov[msg.msg_iovlen].iov_base = &opt_mtu; | |
178 | iov[msg.msg_iovlen].iov_len = sizeof(opt_mtu); | |
179 | msg.msg_iovlen++; | |
180 | } | |
181 | ||
182 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
183 | if (p->valid_until) { |
184 | ||
185 | if (time_now > p->valid_until) | |
186 | p->opt.valid_lifetime = 0; | |
187 | else | |
188 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
189 | ||
190 | if (time_now > p->preferred_until) | |
191 | p->opt.preferred_lifetime = 0; | |
192 | else | |
193 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
194 | } | |
77baf5ae PF |
195 | iov[msg.msg_iovlen].iov_base = &p->opt; |
196 | iov[msg.msg_iovlen].iov_len = sizeof(p->opt); | |
197 | msg.msg_iovlen++; | |
198 | } | |
199 | ||
e9c6da38 PF |
200 | if (ra->rdnss) { |
201 | iov[msg.msg_iovlen].iov_base = ra->rdnss; | |
202 | iov[msg.msg_iovlen].iov_len = ra->rdnss->length * 8; | |
203 | msg.msg_iovlen++; | |
204 | } | |
205 | ||
e965d6ab PF |
206 | if (ra->dnssl) { |
207 | iov[msg.msg_iovlen].iov_base = ra->dnssl; | |
208 | iov[msg.msg_iovlen].iov_len = ra->dnssl->length * 8; | |
209 | msg.msg_iovlen++; | |
210 | } | |
211 | ||
77baf5ae PF |
212 | if (sendmsg(ra->fd, &msg, 0) < 0) |
213 | return -errno; | |
204fb681 | 214 | |
77baf5ae | 215 | return 0; |
204fb681 PF |
216 | } |
217 | ||
88d5a3db PF |
218 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
219 | sd_radv *ra = userdata; | |
220 | _cleanup_free_ char *addr = NULL; | |
221 | struct in6_addr src; | |
222 | triple_timestamp timestamp; | |
223 | int r; | |
224 | ssize_t buflen; | |
225 | _cleanup_free_ char *buf = NULL; | |
226 | ||
227 | assert(s); | |
228 | assert(ra); | |
229 | assert(ra->event); | |
230 | ||
231 | buflen = next_datagram_size_fd(fd); | |
cfffddea LP |
232 | if (buflen < 0) |
233 | return (int) buflen; | |
88d5a3db PF |
234 | |
235 | buf = new0(char, buflen); | |
236 | if (!buf) | |
e55a6eae | 237 | return -ENOMEM; |
88d5a3db PF |
238 | |
239 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
240 | if (r < 0) { | |
241 | switch (r) { | |
242 | case -EADDRNOTAVAIL: | |
243 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
244 | log_radv("Received RS from non-link-local address %s. Ignoring", addr); | |
245 | break; | |
246 | ||
247 | case -EMULTIHOP: | |
248 | log_radv("Received RS with invalid hop limit. Ignoring."); | |
249 | break; | |
250 | ||
251 | case -EPFNOSUPPORT: | |
252 | log_radv("Received invalid source address from ICMPv6 socket. Ignoring."); | |
253 | break; | |
254 | ||
8eb41f4c LP |
255 | case -EAGAIN: /* ignore spurious wakeups */ |
256 | break; | |
257 | ||
88d5a3db | 258 | default: |
8eb41f4c | 259 | log_radv_errno(r, "Unexpected error receiving from ICMPv6 socket: %m"); |
88d5a3db PF |
260 | break; |
261 | } | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
cfffddea LP |
266 | if ((size_t) buflen < sizeof(struct nd_router_solicit)) { |
267 | log_radv("Too short packet received"); | |
268 | return 0; | |
269 | } | |
270 | ||
88d5a3db PF |
271 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); |
272 | ||
273 | r = radv_send(ra, &src, ra->lifetime); | |
274 | if (r < 0) | |
5a9fca25 | 275 | log_radv_errno(r, "Unable to send solicited Router Advertisement to %s: %m", strnull(addr)); |
88d5a3db | 276 | else |
5a9fca25 | 277 | log_radv("Sent solicited Router Advertisement to %s", strnull(addr)); |
88d5a3db PF |
278 | |
279 | return 0; | |
280 | } | |
281 | ||
204fb681 PF |
282 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
283 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
284 | ||
285 | return min + (random_u32() % (max - min)); | |
286 | } | |
287 | ||
288 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
289 | int r; | |
290 | sd_radv *ra = userdata; | |
291 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
292 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
293 | usec_t time_now, timeout; | |
294 | char time_string[FORMAT_TIMESPAN_MAX]; | |
295 | ||
296 | assert(s); | |
297 | assert(ra); | |
298 | assert(ra->event); | |
299 | ||
204fb681 PF |
300 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
301 | if (r < 0) | |
302 | goto fail; | |
303 | ||
304 | r = radv_send(ra, NULL, ra->lifetime); | |
305 | if (r < 0) | |
fdc2afc1 | 306 | log_radv_errno(r, "Unable to send Router Advertisement: %m"); |
204fb681 PF |
307 | |
308 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
309 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
310 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
311 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
312 | } | |
313 | ||
314 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
315 | ||
316 | log_radv("Next Router Advertisement in %s", | |
317 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
318 | timeout, USEC_PER_SEC)); | |
319 | ||
807a8ede YW |
320 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
321 | clock_boottime_or_monotonic(), | |
322 | time_now + timeout, MSEC_PER_SEC, | |
323 | radv_timeout, ra, | |
324 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
325 | if (r < 0) |
326 | goto fail; | |
327 | ||
328 | ra->ra_sent++; | |
329 | ||
807a8ede YW |
330 | return 0; |
331 | ||
204fb681 | 332 | fail: |
807a8ede | 333 | sd_radv_stop(ra); |
204fb681 PF |
334 | |
335 | return 0; | |
336 | } | |
337 | ||
204f99d2 | 338 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
339 | int r; |
340 | ||
204f99d2 PF |
341 | assert_return(ra, -EINVAL); |
342 | ||
6f8a8b84 SS |
343 | if (ra->state == SD_RADV_STATE_IDLE) |
344 | return 0; | |
345 | ||
204f99d2 PF |
346 | log_radv("Stopping IPv6 Router Advertisement daemon"); |
347 | ||
204fb681 PF |
348 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
349 | with zero lifetime */ | |
350 | r = radv_send(ra, NULL, 0); | |
351 | if (r < 0) | |
fdc2afc1 | 352 | log_radv_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); |
204fb681 PF |
353 | |
354 | radv_reset(ra); | |
77baf5ae | 355 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
356 | ra->state = SD_RADV_STATE_IDLE; |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | _public_ int sd_radv_start(sd_radv *ra) { | |
f474884c | 362 | int r; |
204fb681 | 363 | |
204f99d2 PF |
364 | assert_return(ra, -EINVAL); |
365 | assert_return(ra->event, -EINVAL); | |
366 | assert_return(ra->ifindex > 0, -EINVAL); | |
367 | ||
368 | if (ra->state != SD_RADV_STATE_IDLE) | |
369 | return 0; | |
370 | ||
807a8ede YW |
371 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
372 | clock_boottime_or_monotonic(), | |
373 | 0, 0, | |
374 | radv_timeout, ra, | |
375 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
376 | if (r < 0) |
377 | goto fail; | |
378 | ||
77baf5ae PF |
379 | r = icmp6_bind_router_advertisement(ra->ifindex); |
380 | if (r < 0) | |
381 | goto fail; | |
382 | ||
383 | ra->fd = r; | |
88d5a3db PF |
384 | |
385 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
386 | if (r < 0) | |
387 | goto fail; | |
388 | ||
389 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
390 | if (r < 0) | |
391 | goto fail; | |
392 | ||
393 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 394 | |
204f99d2 PF |
395 | ra->state = SD_RADV_STATE_ADVERTISING; |
396 | ||
397 | log_radv("Started IPv6 Router Advertisement daemon"); | |
398 | ||
399 | return 0; | |
204fb681 PF |
400 | |
401 | fail: | |
402 | radv_reset(ra); | |
403 | ||
404 | return r; | |
204f99d2 PF |
405 | } |
406 | ||
407 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
408 | assert_return(ra, -EINVAL); | |
409 | assert_return(ifindex >= -1, -EINVAL); | |
410 | ||
411 | if (ra->state != SD_RADV_STATE_IDLE) | |
412 | return -EBUSY; | |
413 | ||
414 | ra->ifindex = ifindex; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
420 | assert_return(ra, -EINVAL); | |
421 | ||
422 | if (ra->state != SD_RADV_STATE_IDLE) | |
423 | return -EBUSY; | |
424 | ||
425 | if (mac_addr) | |
426 | ra->mac_addr = *mac_addr; | |
427 | else | |
428 | zero(ra->mac_addr); | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
434 | assert_return(ra, -EINVAL); | |
435 | assert_return(mtu >= 1280, -EINVAL); | |
436 | ||
204f99d2 PF |
437 | ra->mtu = mtu; |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
443 | assert_return(ra, -EINVAL); | |
444 | ||
445 | if (ra->state != SD_RADV_STATE_IDLE) | |
446 | return -EBUSY; | |
447 | ||
448 | ra->hop_limit = hop_limit; | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
454 | assert_return(ra, -EINVAL); | |
455 | ||
456 | if (ra->state != SD_RADV_STATE_IDLE) | |
457 | return -EBUSY; | |
458 | ||
459 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
460 | preference value MUST be set to (00) by the sender..." */ | |
461 | if (router_lifetime == 0 && | |
462 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
463 | return -ETIME; | |
464 | ||
465 | ra->lifetime = router_lifetime; | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
471 | assert_return(ra, -EINVAL); | |
472 | ||
473 | if (ra->state != SD_RADV_STATE_IDLE) | |
474 | return -EBUSY; | |
475 | ||
476 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
482 | assert_return(ra, -EINVAL); | |
483 | ||
484 | if (ra->state != SD_RADV_STATE_IDLE) | |
485 | return -EBUSY; | |
486 | ||
487 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
493 | int r = 0; | |
494 | ||
495 | assert_return(ra, -EINVAL); | |
496 | assert_return(IN_SET(preference, | |
497 | SD_NDISC_PREFERENCE_LOW, | |
498 | SD_NDISC_PREFERENCE_MEDIUM, | |
499 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
500 | ||
501 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
502 | ||
503 | return r; | |
504 | } | |
505 | ||
a3a98776 | 506 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, int dynamic) { |
204f99d2 | 507 | sd_radv_prefix *cur; |
d601b566 | 508 | int r; |
204f99d2 | 509 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
510 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
511 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
512 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
513 | |
514 | assert_return(ra, -EINVAL); | |
515 | ||
516 | if (!p) | |
517 | return -EINVAL; | |
518 | ||
519 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
204f99d2 PF |
520 | |
521 | r = in_addr_prefix_intersect(AF_INET6, | |
522 | (union in_addr_union*) &cur->opt.in6_addr, | |
523 | cur->opt.prefixlen, | |
524 | (union in_addr_union*) &p->opt.in6_addr, | |
525 | p->opt.prefixlen); | |
526 | if (r > 0) { | |
527 | _cleanup_free_ char *addr_cur = NULL; | |
528 | ||
204f99d2 PF |
529 | (void) in_addr_to_string(AF_INET6, |
530 | (union in_addr_union*) &p->opt.in6_addr, | |
531 | &addr_p); | |
532 | ||
d601b566 PF |
533 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
534 | goto update; | |
535 | ||
536 | (void) in_addr_to_string(AF_INET6, | |
537 | (union in_addr_union*) &cur->opt.in6_addr, | |
538 | &addr_cur); | |
204f99d2 PF |
539 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", |
540 | addr_cur, cur->opt.prefixlen, | |
541 | addr_p, p->opt.prefixlen); | |
542 | ||
543 | return -EEXIST; | |
544 | } | |
545 | } | |
546 | ||
547 | p = sd_radv_prefix_ref(p); | |
548 | ||
549 | LIST_APPEND(prefix, ra->prefixes, p); | |
550 | ||
551 | ra->n_prefixes++; | |
552 | ||
553 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
d601b566 PF |
554 | |
555 | if (!dynamic) { | |
556 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
557 | return 0; | |
558 | } | |
559 | ||
560 | cur = p; | |
561 | ||
562 | update: | |
563 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
564 | if (r < 0) | |
565 | return r; | |
566 | ||
567 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
568 | valid_until = usec_add(valid, time_now); | |
569 | if (valid_until == USEC_INFINITY) | |
570 | return -EOVERFLOW; | |
571 | ||
572 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
573 | preferred_until = usec_add(preferred, time_now); | |
574 | if (preferred_until == USEC_INFINITY) | |
575 | return -EOVERFLOW; | |
576 | ||
577 | cur->valid_until = valid_until; | |
578 | cur->preferred_until = preferred_until; | |
579 | ||
580 | log_radv("%s prefix %s/%u preferred %s valid %s", | |
581 | cur? "Updated": "Added", | |
582 | addr_p, p->opt.prefixlen, | |
583 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, | |
584 | preferred, USEC_PER_SEC), | |
585 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
586 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
587 | |
588 | return 0; | |
589 | } | |
590 | ||
34c169c4 | 591 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
592 | const struct in6_addr *prefix, |
593 | unsigned char prefixlen) { | |
34c169c4 PF |
594 | sd_radv_prefix *cur, *next; |
595 | ||
596 | assert_return(ra, NULL); | |
597 | assert_return(prefix, NULL); | |
598 | ||
599 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
600 | if (prefixlen != cur->opt.prefixlen) | |
601 | continue; | |
602 | ||
603 | if (!in_addr_equal(AF_INET6, | |
604 | (union in_addr_union *)prefix, | |
605 | (union in_addr_union *)&cur->opt.in6_addr)) | |
606 | continue; | |
607 | ||
608 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
609 | ra->n_prefixes--; | |
610 | ||
611 | break; | |
612 | } | |
613 | ||
614 | return cur; | |
615 | } | |
616 | ||
e9c6da38 PF |
617 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
618 | const struct in6_addr *dns, size_t n_dns) { | |
619 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
620 | size_t len; | |
621 | ||
622 | assert_return(ra, -EINVAL); | |
623 | assert_return(n_dns < 128, -EINVAL); | |
624 | ||
625 | if (!dns || n_dns == 0) { | |
626 | ra->rdnss = mfree(ra->rdnss); | |
627 | ra->n_rdnss = 0; | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
632 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
633 | ||
634 | opt_rdnss = malloc0(len); | |
635 | if (!opt_rdnss) | |
636 | return -ENOMEM; | |
637 | ||
638 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
639 | opt_rdnss->length = len / 8; | |
640 | opt_rdnss->lifetime = htobe32(lifetime); | |
641 | ||
642 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
643 | ||
1cc6c93a | 644 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
645 | |
646 | ra->n_rdnss = n_dns; | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
e965d6ab PF |
651 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
652 | char **search_list) { | |
653 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
654 | size_t len = 0; | |
655 | char **s; | |
656 | uint8_t *p; | |
657 | ||
658 | assert_return(ra, -EINVAL); | |
659 | ||
97d7974b | 660 | if (strv_isempty(search_list)) { |
e965d6ab | 661 | ra->dnssl = mfree(ra->dnssl); |
e965d6ab PF |
662 | return 0; |
663 | } | |
664 | ||
665 | STRV_FOREACH(s, search_list) | |
666 | len += strlen(*s) + 2; | |
667 | ||
668 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
669 | ||
670 | opt_dnssl = malloc0(len); | |
671 | if (!opt_dnssl) | |
672 | return -ENOMEM; | |
673 | ||
674 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
675 | opt_dnssl->length = len / 8; | |
676 | opt_dnssl->lifetime = htobe32(lifetime); | |
677 | ||
678 | p = (uint8_t *)(opt_dnssl + 1); | |
679 | len -= sizeof(struct sd_radv_opt_dns); | |
680 | ||
681 | STRV_FOREACH(s, search_list) { | |
682 | int r; | |
683 | ||
684 | r = dns_name_to_wire_format(*s, p, len, false); | |
685 | if (r < 0) | |
686 | return r; | |
687 | ||
688 | if (len < (size_t)r) | |
689 | return -ENOBUFS; | |
690 | ||
691 | p += r; | |
692 | len -= r; | |
693 | } | |
694 | ||
1cc6c93a | 695 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
696 | |
697 | return 0; | |
698 | } | |
699 | ||
04473969 PF |
700 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
701 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
702 | ||
703 | assert_return(ret, -EINVAL); | |
704 | ||
705 | p = new0(sd_radv_prefix, 1); | |
706 | if (!p) | |
707 | return -ENOMEM; | |
708 | ||
709 | p->n_ref = 1; | |
710 | ||
711 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
712 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
713 | ||
714 | p->opt.prefixlen = 64; | |
715 | ||
716 | /* RFC 4861, Section 6.2.1 */ | |
717 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
718 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
719 | p->opt.preferred_lifetime = htobe32(604800); | |
720 | p->opt.valid_lifetime = htobe32(2592000); | |
721 | ||
204f99d2 PF |
722 | LIST_INIT(prefix, p); |
723 | ||
1cc6c93a | 724 | *ret = TAKE_PTR(p); |
04473969 PF |
725 | |
726 | return 0; | |
727 | } | |
728 | ||
8301aa0b | 729 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree); |
04473969 | 730 | |
f5a5706a | 731 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
732 | unsigned char prefixlen) { |
733 | assert_return(p, -EINVAL); | |
734 | assert_return(in6_addr, -EINVAL); | |
735 | ||
736 | if (prefixlen < 3 || prefixlen > 128) | |
737 | return -EINVAL; | |
738 | ||
739 | if (prefixlen > 64) | |
740 | /* unusual but allowed, log it */ | |
741 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
742 | ||
743 | p->opt.in6_addr = *in6_addr; | |
744 | p->opt.prefixlen = prefixlen; | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
749 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
750 | assert_return(p, -EINVAL); | |
751 | ||
752 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
757 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
758 | int address_autoconfiguration) { | |
759 | assert_return(p, -EINVAL); | |
760 | ||
761 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
766 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
767 | uint32_t valid_lifetime) { | |
768 | assert_return(p, -EINVAL); | |
769 | ||
770 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
775 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
776 | uint32_t preferred_lifetime) { | |
777 | assert_return(p, -EINVAL); | |
778 | ||
779 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
780 | ||
781 | return 0; | |
782 | } |