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04473969 PF |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2017 Intel Corporation. All rights reserved. | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <netinet/icmp6.h> | |
21 | #include <netinet/in.h> | |
204f99d2 | 22 | #include <arpa/inet.h> |
04473969 PF |
23 | |
24 | #include "sd-radv.h" | |
25 | ||
204f99d2 | 26 | #include "macro.h" |
04473969 PF |
27 | #include "alloc-util.h" |
28 | #include "fd-util.h" | |
29 | #include "icmp6-util.h" | |
30 | #include "in-addr-util.h" | |
31 | #include "radv-internal.h" | |
32 | #include "socket-util.h" | |
33 | #include "string-util.h" | |
34 | #include "util.h" | |
204fb681 | 35 | #include "random-util.h" |
04473969 | 36 | |
204f99d2 PF |
37 | _public_ int sd_radv_new(sd_radv **ret) { |
38 | _cleanup_(sd_radv_unrefp) sd_radv *ra = NULL; | |
39 | ||
40 | assert_return(ret, -EINVAL); | |
41 | ||
42 | ra = new0(sd_radv, 1); | |
43 | if (!ra) | |
44 | return -ENOMEM; | |
45 | ||
46 | ra->n_ref = 1; | |
47 | ||
48 | LIST_HEAD_INIT(ra->prefixes); | |
49 | ||
50 | *ret = ra; | |
51 | ra = NULL; | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | _public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) { | |
57 | int r; | |
58 | ||
59 | assert_return(ra, -EINVAL); | |
60 | assert_return(!ra->event, -EBUSY); | |
61 | ||
62 | if (event) | |
63 | ra->event = sd_event_ref(event); | |
64 | else { | |
65 | r = sd_event_default(&ra->event); | |
66 | if (r < 0) | |
67 | return 0; | |
68 | } | |
69 | ||
70 | ra->event_priority = priority; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | _public_ int sd_radv_detach_event(sd_radv *ra) { | |
76 | ||
77 | assert_return(ra, -EINVAL); | |
78 | ||
79 | ra->event = sd_event_unref(ra->event); | |
80 | return 0; | |
81 | } | |
82 | ||
83 | _public_ sd_event *sd_radv_get_event(sd_radv *ra) { | |
84 | assert_return(ra, NULL); | |
85 | ||
86 | return ra->event; | |
87 | } | |
88 | ||
204fb681 PF |
89 | static void radv_reset(sd_radv *ra) { |
90 | ||
91 | ra->timeout_event_source = | |
92 | sd_event_source_unref(ra->timeout_event_source); | |
93 | ||
94 | ra->ra_sent = 0; | |
95 | } | |
96 | ||
204f99d2 PF |
97 | _public_ sd_radv *sd_radv_ref(sd_radv *ra) { |
98 | if (!ra) | |
99 | return NULL; | |
100 | ||
101 | assert(ra->n_ref > 0); | |
102 | ra->n_ref++; | |
103 | ||
104 | return ra; | |
105 | } | |
106 | ||
107 | _public_ sd_radv *sd_radv_unref(sd_radv *ra) { | |
108 | if (!ra) | |
109 | return NULL; | |
110 | ||
111 | assert(ra->n_ref > 0); | |
112 | ra->n_ref--; | |
113 | ||
114 | if (ra->n_ref > 0) | |
115 | return NULL; | |
116 | ||
117 | while (ra->prefixes) { | |
118 | sd_radv_prefix *p = ra->prefixes; | |
119 | ||
120 | LIST_REMOVE(prefix, ra->prefixes, p); | |
121 | sd_radv_prefix_unref(p); | |
122 | } | |
123 | ||
204fb681 PF |
124 | radv_reset(ra); |
125 | ||
204f99d2 PF |
126 | sd_radv_detach_event(ra); |
127 | return mfree(ra); | |
128 | } | |
129 | ||
204fb681 PF |
130 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, |
131 | const uint32_t router_lifetime) { | |
132 | ||
133 | return -ENOSYS; | |
134 | } | |
135 | ||
136 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { | |
137 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
138 | ||
139 | return min + (random_u32() % (max - min)); | |
140 | } | |
141 | ||
142 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
143 | int r; | |
144 | sd_radv *ra = userdata; | |
145 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
146 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
147 | usec_t time_now, timeout; | |
148 | char time_string[FORMAT_TIMESPAN_MAX]; | |
149 | ||
150 | assert(s); | |
151 | assert(ra); | |
152 | assert(ra->event); | |
153 | ||
154 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); | |
155 | ||
156 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
157 | if (r < 0) | |
158 | goto fail; | |
159 | ||
160 | r = radv_send(ra, NULL, ra->lifetime); | |
161 | if (r < 0) | |
162 | log_radv_warning_errno(r, "Unable to send Router Advertisement: %m"); | |
163 | ||
164 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
165 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
166 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
167 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
168 | } | |
169 | ||
170 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
171 | ||
172 | log_radv("Next Router Advertisement in %s", | |
173 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
174 | timeout, USEC_PER_SEC)); | |
175 | ||
176 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, | |
177 | clock_boottime_or_monotonic(), | |
178 | time_now + timeout, MSEC_PER_SEC, | |
179 | radv_timeout, ra); | |
180 | if (r < 0) | |
181 | goto fail; | |
182 | ||
183 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
184 | ra->event_priority); | |
185 | if (r < 0) | |
186 | goto fail; | |
187 | ||
188 | r = sd_event_source_set_description(ra->timeout_event_source, | |
189 | "radv-timeout"); | |
190 | if (r < 0) | |
191 | goto fail; | |
192 | ||
193 | ra->ra_sent++; | |
194 | ||
195 | fail: | |
196 | if (r < 0) | |
197 | sd_radv_stop(ra); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
204f99d2 | 202 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
203 | int r; |
204 | ||
204f99d2 PF |
205 | assert_return(ra, -EINVAL); |
206 | ||
207 | log_radv("Stopping IPv6 Router Advertisement daemon"); | |
208 | ||
204fb681 PF |
209 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
210 | with zero lifetime */ | |
211 | r = radv_send(ra, NULL, 0); | |
212 | if (r < 0) | |
213 | log_radv_warning_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); | |
214 | ||
215 | radv_reset(ra); | |
204f99d2 PF |
216 | ra->state = SD_RADV_STATE_IDLE; |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | _public_ int sd_radv_start(sd_radv *ra) { | |
204fb681 PF |
222 | int r = 0; |
223 | ||
204f99d2 PF |
224 | assert_return(ra, -EINVAL); |
225 | assert_return(ra->event, -EINVAL); | |
226 | assert_return(ra->ifindex > 0, -EINVAL); | |
227 | ||
228 | if (ra->state != SD_RADV_STATE_IDLE) | |
229 | return 0; | |
230 | ||
204fb681 PF |
231 | r = sd_event_add_time(ra->event, &ra->timeout_event_source, |
232 | clock_boottime_or_monotonic(), 0, 0, | |
233 | radv_timeout, ra); | |
234 | if (r < 0) | |
235 | goto fail; | |
236 | ||
237 | r = sd_event_source_set_priority(ra->timeout_event_source, | |
238 | ra->event_priority); | |
239 | if (r < 0) | |
240 | goto fail; | |
241 | ||
242 | (void) sd_event_source_set_description(ra->timeout_event_source, | |
243 | "radv-timeout"); | |
244 | ||
204f99d2 PF |
245 | ra->state = SD_RADV_STATE_ADVERTISING; |
246 | ||
247 | log_radv("Started IPv6 Router Advertisement daemon"); | |
248 | ||
249 | return 0; | |
204fb681 PF |
250 | |
251 | fail: | |
252 | radv_reset(ra); | |
253 | ||
254 | return r; | |
204f99d2 PF |
255 | } |
256 | ||
257 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
258 | assert_return(ra, -EINVAL); | |
259 | assert_return(ifindex >= -1, -EINVAL); | |
260 | ||
261 | if (ra->state != SD_RADV_STATE_IDLE) | |
262 | return -EBUSY; | |
263 | ||
264 | ra->ifindex = ifindex; | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
270 | assert_return(ra, -EINVAL); | |
271 | ||
272 | if (ra->state != SD_RADV_STATE_IDLE) | |
273 | return -EBUSY; | |
274 | ||
275 | if (mac_addr) | |
276 | ra->mac_addr = *mac_addr; | |
277 | else | |
278 | zero(ra->mac_addr); | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
284 | assert_return(ra, -EINVAL); | |
285 | assert_return(mtu >= 1280, -EINVAL); | |
286 | ||
287 | if (ra->state != SD_RADV_STATE_IDLE) | |
288 | return -EBUSY; | |
289 | ||
290 | ra->mtu = mtu; | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
296 | assert_return(ra, -EINVAL); | |
297 | ||
298 | if (ra->state != SD_RADV_STATE_IDLE) | |
299 | return -EBUSY; | |
300 | ||
301 | ra->hop_limit = hop_limit; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
307 | assert_return(ra, -EINVAL); | |
308 | ||
309 | if (ra->state != SD_RADV_STATE_IDLE) | |
310 | return -EBUSY; | |
311 | ||
312 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
313 | preference value MUST be set to (00) by the sender..." */ | |
314 | if (router_lifetime == 0 && | |
315 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
316 | return -ETIME; | |
317 | ||
318 | ra->lifetime = router_lifetime; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
324 | assert_return(ra, -EINVAL); | |
325 | ||
326 | if (ra->state != SD_RADV_STATE_IDLE) | |
327 | return -EBUSY; | |
328 | ||
329 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
335 | assert_return(ra, -EINVAL); | |
336 | ||
337 | if (ra->state != SD_RADV_STATE_IDLE) | |
338 | return -EBUSY; | |
339 | ||
340 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
346 | int r = 0; | |
347 | ||
348 | assert_return(ra, -EINVAL); | |
349 | assert_return(IN_SET(preference, | |
350 | SD_NDISC_PREFERENCE_LOW, | |
351 | SD_NDISC_PREFERENCE_MEDIUM, | |
352 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
353 | ||
354 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
355 | ||
356 | return r; | |
357 | } | |
358 | ||
359 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p) { | |
360 | sd_radv_prefix *cur; | |
361 | _cleanup_free_ char *addr_p = NULL; | |
362 | ||
363 | assert_return(ra, -EINVAL); | |
364 | ||
365 | if (!p) | |
366 | return -EINVAL; | |
367 | ||
368 | LIST_FOREACH(prefix, cur, ra->prefixes) { | |
369 | int r; | |
370 | ||
371 | r = in_addr_prefix_intersect(AF_INET6, | |
372 | (union in_addr_union*) &cur->opt.in6_addr, | |
373 | cur->opt.prefixlen, | |
374 | (union in_addr_union*) &p->opt.in6_addr, | |
375 | p->opt.prefixlen); | |
376 | if (r > 0) { | |
377 | _cleanup_free_ char *addr_cur = NULL; | |
378 | ||
379 | (void) in_addr_to_string(AF_INET6, | |
380 | (union in_addr_union*) &cur->opt.in6_addr, | |
381 | &addr_cur); | |
382 | (void) in_addr_to_string(AF_INET6, | |
383 | (union in_addr_union*) &p->opt.in6_addr, | |
384 | &addr_p); | |
385 | ||
386 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", | |
387 | addr_cur, cur->opt.prefixlen, | |
388 | addr_p, p->opt.prefixlen); | |
389 | ||
390 | return -EEXIST; | |
391 | } | |
392 | } | |
393 | ||
394 | p = sd_radv_prefix_ref(p); | |
395 | ||
396 | LIST_APPEND(prefix, ra->prefixes, p); | |
397 | ||
398 | ra->n_prefixes++; | |
399 | ||
400 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
401 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
04473969 PF |
406 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
407 | _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL; | |
408 | ||
409 | assert_return(ret, -EINVAL); | |
410 | ||
411 | p = new0(sd_radv_prefix, 1); | |
412 | if (!p) | |
413 | return -ENOMEM; | |
414 | ||
415 | p->n_ref = 1; | |
416 | ||
417 | p->opt.type = ND_OPT_PREFIX_INFORMATION; | |
418 | p->opt.length = (sizeof(p->opt) - 1) /8 + 1; | |
419 | ||
420 | p->opt.prefixlen = 64; | |
421 | ||
422 | /* RFC 4861, Section 6.2.1 */ | |
423 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, true); | |
424 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, true); | |
425 | p->opt.preferred_lifetime = htobe32(604800); | |
426 | p->opt.valid_lifetime = htobe32(2592000); | |
427 | ||
204f99d2 PF |
428 | LIST_INIT(prefix, p); |
429 | ||
04473969 PF |
430 | *ret = p; |
431 | p = NULL; | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | _public_ sd_radv_prefix *sd_radv_prefix_ref(sd_radv_prefix *p) { | |
437 | if (!p) | |
438 | return NULL; | |
439 | ||
440 | assert(p->n_ref > 0); | |
441 | p->n_ref++; | |
442 | ||
443 | return p; | |
444 | } | |
445 | ||
446 | _public_ sd_radv_prefix *sd_radv_prefix_unref(sd_radv_prefix *p) { | |
447 | if (!p) | |
448 | return NULL; | |
449 | ||
450 | assert(p->n_ref > 0); | |
451 | p->n_ref--; | |
452 | ||
453 | if (p->n_ref > 0) | |
454 | return NULL; | |
455 | ||
456 | return mfree(p); | |
457 | } | |
458 | ||
459 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, struct in6_addr *in6_addr, | |
460 | unsigned char prefixlen) { | |
461 | assert_return(p, -EINVAL); | |
462 | assert_return(in6_addr, -EINVAL); | |
463 | ||
464 | if (prefixlen < 3 || prefixlen > 128) | |
465 | return -EINVAL; | |
466 | ||
467 | if (prefixlen > 64) | |
468 | /* unusual but allowed, log it */ | |
469 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
470 | ||
471 | p->opt.in6_addr = *in6_addr; | |
472 | p->opt.prefixlen = prefixlen; | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
478 | assert_return(p, -EINVAL); | |
479 | ||
480 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
486 | int address_autoconfiguration) { | |
487 | assert_return(p, -EINVAL); | |
488 | ||
489 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
494 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
495 | uint32_t valid_lifetime) { | |
496 | assert_return(p, -EINVAL); | |
497 | ||
498 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
503 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
504 | uint32_t preferred_lifetime) { | |
505 | assert_return(p, -EINVAL); | |
506 | ||
507 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
508 | ||
509 | return 0; | |
510 | } |