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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 | ||
12 | #include "alloc-util.h" | |
e965d6ab | 13 | #include "dns-domain.h" |
ae25915d | 14 | #include "ether-addr-util.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" | |
5cfa2c3d LP |
19 | #include "io-util.h" |
20 | #include "macro.h" | |
0a970718 | 21 | #include "memory-util.h" |
04473969 | 22 | #include "radv-internal.h" |
5cfa2c3d | 23 | #include "random-util.h" |
04473969 PF |
24 | #include "socket-util.h" |
25 | #include "string-util.h" | |
e965d6ab | 26 | #include "strv.h" |
04473969 | 27 | |
204f99d2 PF |
28 | _public_ int sd_radv_new(sd_radv **ret) { |
29 | _cleanup_(sd_radv_unrefp) sd_radv *ra = NULL; | |
30 | ||
31 | assert_return(ret, -EINVAL); | |
32 | ||
78f9d24f | 33 | ra = new(sd_radv, 1); |
204f99d2 PF |
34 | if (!ra) |
35 | return -ENOMEM; | |
36 | ||
78f9d24f YW |
37 | *ra = (sd_radv) { |
38 | .n_ref = 1, | |
39 | .fd = -1, | |
40 | }; | |
204f99d2 | 41 | |
1cc6c93a | 42 | *ret = TAKE_PTR(ra); |
204f99d2 PF |
43 | |
44 | return 0; | |
45 | } | |
46 | ||
47 | _public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) { | |
48 | int r; | |
49 | ||
50 | assert_return(ra, -EINVAL); | |
51 | assert_return(!ra->event, -EBUSY); | |
52 | ||
53 | if (event) | |
54 | ra->event = sd_event_ref(event); | |
55 | else { | |
56 | r = sd_event_default(&ra->event); | |
57 | if (r < 0) | |
58 | return 0; | |
59 | } | |
60 | ||
61 | ra->event_priority = priority; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | _public_ int sd_radv_detach_event(sd_radv *ra) { | |
67 | ||
68 | assert_return(ra, -EINVAL); | |
69 | ||
70 | ra->event = sd_event_unref(ra->event); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | _public_ sd_event *sd_radv_get_event(sd_radv *ra) { | |
75 | assert_return(ra, NULL); | |
76 | ||
77 | return ra->event; | |
78 | } | |
79 | ||
204fb681 | 80 | static void radv_reset(sd_radv *ra) { |
c4b6dda0 | 81 | assert(ra); |
204fb681 | 82 | |
807a8ede | 83 | (void) event_source_disable(ra->timeout_event_source); |
204fb681 | 84 | |
88d5a3db PF |
85 | ra->recv_event_source = |
86 | sd_event_source_unref(ra->recv_event_source); | |
87 | ||
204fb681 PF |
88 | ra->ra_sent = 0; |
89 | } | |
90 | ||
8301aa0b | 91 | static sd_radv *radv_free(sd_radv *ra) { |
e866e17b LP |
92 | if (!ra) |
93 | return NULL; | |
204f99d2 PF |
94 | |
95 | while (ra->prefixes) { | |
96 | sd_radv_prefix *p = ra->prefixes; | |
97 | ||
98 | LIST_REMOVE(prefix, ra->prefixes, p); | |
99 | sd_radv_prefix_unref(p); | |
100 | } | |
101 | ||
e9c6da38 | 102 | free(ra->rdnss); |
f9aa5417 | 103 | free(ra->dnssl); |
e9c6da38 | 104 | |
807a8ede YW |
105 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); |
106 | ||
204fb681 PF |
107 | radv_reset(ra); |
108 | ||
204f99d2 | 109 | sd_radv_detach_event(ra); |
c4b6dda0 LP |
110 | |
111 | ra->fd = safe_close(ra->fd); | |
112 | ||
204f99d2 PF |
113 | return mfree(ra); |
114 | } | |
115 | ||
8301aa0b YW |
116 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv, sd_radv, radv_free); |
117 | ||
83ef9d14 | 118 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, uint32_t router_lifetime) { |
203d4df5 | 119 | sd_radv_route_prefix *rt; |
77baf5ae PF |
120 | sd_radv_prefix *p; |
121 | struct sockaddr_in6 dst_addr = { | |
122 | .sin6_family = AF_INET6, | |
123 | .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
124 | }; | |
125 | struct nd_router_advert adv = {}; | |
126 | struct { | |
127 | struct nd_opt_hdr opthdr; | |
128 | struct ether_addr slladdr; | |
129 | } _packed_ opt_mac = { | |
130 | .opthdr = { | |
131 | .nd_opt_type = ND_OPT_SOURCE_LINKADDR, | |
132 | .nd_opt_len = (sizeof(struct nd_opt_hdr) + | |
133 | sizeof(struct ether_addr) - 1) /8 + 1, | |
134 | }, | |
135 | }; | |
136 | struct nd_opt_mtu opt_mtu = { | |
137 | .nd_opt_mtu_type = ND_OPT_MTU, | |
138 | .nd_opt_mtu_len = 1, | |
139 | }; | |
203d4df5 | 140 | /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, N routes, RDNSS |
6852c0f6 | 141 | and DNSSL */ |
203d4df5 | 142 | struct iovec iov[5 + ra->n_prefixes + ra->n_route_prefixes]; |
77baf5ae PF |
143 | struct msghdr msg = { |
144 | .msg_name = &dst_addr, | |
145 | .msg_namelen = sizeof(dst_addr), | |
146 | .msg_iov = iov, | |
147 | }; | |
d601b566 PF |
148 | usec_t time_now; |
149 | int r; | |
150 | ||
dc0ec5e2 LP |
151 | assert(ra); |
152 | ||
d601b566 PF |
153 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
154 | if (r < 0) | |
155 | return r; | |
77baf5ae | 156 | |
dc0ec5e2 | 157 | if (dst && !IN6_IS_ADDR_UNSPECIFIED(dst)) |
77baf5ae | 158 | dst_addr.sin6_addr = *dst; |
88d5a3db | 159 | |
77baf5ae PF |
160 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
161 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
162 | adv.nd_ra_flags_reserved = ra->flags; | |
163 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
5cfa2c3d | 164 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&adv, sizeof(adv)); |
77baf5ae PF |
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 | 169 | opt_mac.slladdr = ra->mac_addr; |
5cfa2c3d | 170 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&opt_mac, sizeof(opt_mac)); |
77baf5ae PF |
171 | } |
172 | ||
173 | if (ra->mtu) { | |
174 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
5cfa2c3d | 175 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&opt_mtu, sizeof(opt_mtu)); |
77baf5ae PF |
176 | } |
177 | ||
178 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
179 | if (p->valid_until) { |
180 | ||
181 | if (time_now > p->valid_until) | |
182 | p->opt.valid_lifetime = 0; | |
183 | else | |
184 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
185 | ||
186 | if (time_now > p->preferred_until) | |
187 | p->opt.preferred_lifetime = 0; | |
188 | else | |
189 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
190 | } | |
5cfa2c3d | 191 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&p->opt, sizeof(p->opt)); |
77baf5ae PF |
192 | } |
193 | ||
203d4df5 SS |
194 | LIST_FOREACH(prefix, rt, ra->route_prefixes) |
195 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&rt->opt, sizeof(rt->opt)); | |
196 | ||
5cfa2c3d LP |
197 | if (ra->rdnss) |
198 | iov[msg.msg_iovlen++] = IOVEC_MAKE(ra->rdnss, ra->rdnss->length * 8); | |
e9c6da38 | 199 | |
5cfa2c3d LP |
200 | if (ra->dnssl) |
201 | iov[msg.msg_iovlen++] = IOVEC_MAKE(ra->dnssl, ra->dnssl->length * 8); | |
e965d6ab | 202 | |
77baf5ae PF |
203 | if (sendmsg(ra->fd, &msg, 0) < 0) |
204 | return -errno; | |
204fb681 | 205 | |
77baf5ae | 206 | return 0; |
204fb681 PF |
207 | } |
208 | ||
88d5a3db PF |
209 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
210 | sd_radv *ra = userdata; | |
211 | _cleanup_free_ char *addr = NULL; | |
212 | struct in6_addr src; | |
213 | triple_timestamp timestamp; | |
214 | int r; | |
215 | ssize_t buflen; | |
216 | _cleanup_free_ char *buf = NULL; | |
217 | ||
218 | assert(s); | |
219 | assert(ra); | |
220 | assert(ra->event); | |
221 | ||
222 | buflen = next_datagram_size_fd(fd); | |
cfffddea LP |
223 | if (buflen < 0) |
224 | return (int) buflen; | |
88d5a3db PF |
225 | |
226 | buf = new0(char, buflen); | |
227 | if (!buf) | |
e55a6eae | 228 | return -ENOMEM; |
88d5a3db PF |
229 | |
230 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
231 | if (r < 0) { | |
232 | switch (r) { | |
233 | case -EADDRNOTAVAIL: | |
234 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); | |
235 | log_radv("Received RS from non-link-local address %s. Ignoring", addr); | |
236 | break; | |
237 | ||
238 | case -EMULTIHOP: | |
239 | log_radv("Received RS with invalid hop limit. Ignoring."); | |
240 | break; | |
241 | ||
242 | case -EPFNOSUPPORT: | |
243 | log_radv("Received invalid source address from ICMPv6 socket. Ignoring."); | |
244 | break; | |
245 | ||
8eb41f4c LP |
246 | case -EAGAIN: /* ignore spurious wakeups */ |
247 | break; | |
248 | ||
88d5a3db | 249 | default: |
8eb41f4c | 250 | log_radv_errno(r, "Unexpected error receiving from ICMPv6 socket: %m"); |
88d5a3db PF |
251 | break; |
252 | } | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
cfffddea LP |
257 | if ((size_t) buflen < sizeof(struct nd_router_solicit)) { |
258 | log_radv("Too short packet received"); | |
259 | return 0; | |
260 | } | |
261 | ||
88d5a3db PF |
262 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &src, &addr); |
263 | ||
264 | r = radv_send(ra, &src, ra->lifetime); | |
265 | if (r < 0) | |
5a9fca25 | 266 | log_radv_errno(r, "Unable to send solicited Router Advertisement to %s: %m", strnull(addr)); |
88d5a3db | 267 | else |
5a9fca25 | 268 | log_radv("Sent solicited Router Advertisement to %s", strnull(addr)); |
88d5a3db PF |
269 | |
270 | return 0; | |
271 | } | |
272 | ||
204fb681 PF |
273 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
274 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
275 | ||
276 | return min + (random_u32() % (max - min)); | |
277 | } | |
278 | ||
279 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
280 | int r; | |
281 | sd_radv *ra = userdata; | |
282 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
283 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
284 | usec_t time_now, timeout; | |
285 | char time_string[FORMAT_TIMESPAN_MAX]; | |
286 | ||
287 | assert(s); | |
288 | assert(ra); | |
289 | assert(ra->event); | |
290 | ||
204fb681 PF |
291 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
292 | if (r < 0) | |
293 | goto fail; | |
294 | ||
295 | r = radv_send(ra, NULL, ra->lifetime); | |
296 | if (r < 0) | |
fdc2afc1 | 297 | log_radv_errno(r, "Unable to send Router Advertisement: %m"); |
204fb681 PF |
298 | |
299 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
300 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
301 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
302 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
303 | } | |
304 | ||
305 | timeout = radv_compute_timeout(min_timeout, max_timeout); | |
306 | ||
307 | log_radv("Next Router Advertisement in %s", | |
308 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
309 | timeout, USEC_PER_SEC)); | |
310 | ||
807a8ede YW |
311 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
312 | clock_boottime_or_monotonic(), | |
313 | time_now + timeout, MSEC_PER_SEC, | |
314 | radv_timeout, ra, | |
315 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
316 | if (r < 0) |
317 | goto fail; | |
318 | ||
319 | ra->ra_sent++; | |
320 | ||
807a8ede YW |
321 | return 0; |
322 | ||
204fb681 | 323 | fail: |
807a8ede | 324 | sd_radv_stop(ra); |
204fb681 PF |
325 | |
326 | return 0; | |
327 | } | |
328 | ||
204f99d2 | 329 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
330 | int r; |
331 | ||
204f99d2 PF |
332 | assert_return(ra, -EINVAL); |
333 | ||
6f8a8b84 SS |
334 | if (ra->state == SD_RADV_STATE_IDLE) |
335 | return 0; | |
336 | ||
204f99d2 PF |
337 | log_radv("Stopping IPv6 Router Advertisement daemon"); |
338 | ||
204fb681 PF |
339 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
340 | with zero lifetime */ | |
341 | r = radv_send(ra, NULL, 0); | |
342 | if (r < 0) | |
fdc2afc1 | 343 | log_radv_errno(r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); |
204fb681 PF |
344 | |
345 | radv_reset(ra); | |
77baf5ae | 346 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
347 | ra->state = SD_RADV_STATE_IDLE; |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | _public_ int sd_radv_start(sd_radv *ra) { | |
f474884c | 353 | int r; |
204fb681 | 354 | |
204f99d2 PF |
355 | assert_return(ra, -EINVAL); |
356 | assert_return(ra->event, -EINVAL); | |
357 | assert_return(ra->ifindex > 0, -EINVAL); | |
358 | ||
359 | if (ra->state != SD_RADV_STATE_IDLE) | |
360 | return 0; | |
361 | ||
807a8ede YW |
362 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
363 | clock_boottime_or_monotonic(), | |
364 | 0, 0, | |
365 | radv_timeout, ra, | |
366 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
367 | if (r < 0) |
368 | goto fail; | |
369 | ||
77baf5ae PF |
370 | r = icmp6_bind_router_advertisement(ra->ifindex); |
371 | if (r < 0) | |
372 | goto fail; | |
373 | ||
374 | ra->fd = r; | |
88d5a3db PF |
375 | |
376 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
377 | if (r < 0) | |
378 | goto fail; | |
379 | ||
380 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
381 | if (r < 0) | |
382 | goto fail; | |
383 | ||
384 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 385 | |
204f99d2 PF |
386 | ra->state = SD_RADV_STATE_ADVERTISING; |
387 | ||
388 | log_radv("Started IPv6 Router Advertisement daemon"); | |
389 | ||
390 | return 0; | |
204fb681 PF |
391 | |
392 | fail: | |
393 | radv_reset(ra); | |
394 | ||
395 | return r; | |
204f99d2 PF |
396 | } |
397 | ||
398 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
399 | assert_return(ra, -EINVAL); | |
400 | assert_return(ifindex >= -1, -EINVAL); | |
401 | ||
402 | if (ra->state != SD_RADV_STATE_IDLE) | |
403 | return -EBUSY; | |
404 | ||
405 | ra->ifindex = ifindex; | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { | |
411 | assert_return(ra, -EINVAL); | |
412 | ||
413 | if (ra->state != SD_RADV_STATE_IDLE) | |
414 | return -EBUSY; | |
415 | ||
416 | if (mac_addr) | |
417 | ra->mac_addr = *mac_addr; | |
418 | else | |
419 | zero(ra->mac_addr); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
425 | assert_return(ra, -EINVAL); | |
426 | assert_return(mtu >= 1280, -EINVAL); | |
427 | ||
204f99d2 PF |
428 | ra->mtu = mtu; |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
434 | assert_return(ra, -EINVAL); | |
435 | ||
436 | if (ra->state != SD_RADV_STATE_IDLE) | |
437 | return -EBUSY; | |
438 | ||
439 | ra->hop_limit = hop_limit; | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint32_t router_lifetime) { | |
445 | assert_return(ra, -EINVAL); | |
446 | ||
447 | if (ra->state != SD_RADV_STATE_IDLE) | |
448 | return -EBUSY; | |
449 | ||
450 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the | |
451 | preference value MUST be set to (00) by the sender..." */ | |
452 | if (router_lifetime == 0 && | |
453 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
454 | return -ETIME; | |
455 | ||
456 | ra->lifetime = router_lifetime; | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
462 | assert_return(ra, -EINVAL); | |
463 | ||
464 | if (ra->state != SD_RADV_STATE_IDLE) | |
465 | return -EBUSY; | |
466 | ||
467 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
472 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
473 | assert_return(ra, -EINVAL); | |
474 | ||
475 | if (ra->state != SD_RADV_STATE_IDLE) | |
476 | return -EBUSY; | |
477 | ||
478 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
483 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
484 | int r = 0; | |
485 | ||
486 | assert_return(ra, -EINVAL); | |
487 | assert_return(IN_SET(preference, | |
488 | SD_NDISC_PREFERENCE_LOW, | |
489 | SD_NDISC_PREFERENCE_MEDIUM, | |
490 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
491 | ||
492 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); | |
493 | ||
494 | return r; | |
495 | } | |
496 | ||
a3a98776 | 497 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, int dynamic) { |
204f99d2 | 498 | sd_radv_prefix *cur; |
d601b566 | 499 | int r; |
204f99d2 | 500 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
501 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
502 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
503 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
504 | |
505 | assert_return(ra, -EINVAL); | |
506 | ||
507 | if (!p) | |
508 | return -EINVAL; | |
509 | ||
59ea6e57 LP |
510 | /* Refuse prefixes that don't have a prefix set */ |
511 | if (IN6_IS_ADDR_UNSPECIFIED(&p->opt.in6_addr)) | |
512 | return -ENOEXEC; | |
513 | ||
204f99d2 | 514 | LIST_FOREACH(prefix, cur, ra->prefixes) { |
204f99d2 PF |
515 | |
516 | r = in_addr_prefix_intersect(AF_INET6, | |
517 | (union in_addr_union*) &cur->opt.in6_addr, | |
518 | cur->opt.prefixlen, | |
519 | (union in_addr_union*) &p->opt.in6_addr, | |
520 | p->opt.prefixlen); | |
521 | if (r > 0) { | |
522 | _cleanup_free_ char *addr_cur = NULL; | |
523 | ||
204f99d2 PF |
524 | (void) in_addr_to_string(AF_INET6, |
525 | (union in_addr_union*) &p->opt.in6_addr, | |
526 | &addr_p); | |
527 | ||
d601b566 PF |
528 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
529 | goto update; | |
530 | ||
531 | (void) in_addr_to_string(AF_INET6, | |
532 | (union in_addr_union*) &cur->opt.in6_addr, | |
533 | &addr_cur); | |
204f99d2 PF |
534 | log_radv("IPv6 prefix %s/%u already configured, ignoring %s/%u", |
535 | addr_cur, cur->opt.prefixlen, | |
536 | addr_p, p->opt.prefixlen); | |
537 | ||
538 | return -EEXIST; | |
539 | } | |
540 | } | |
541 | ||
542 | p = sd_radv_prefix_ref(p); | |
543 | ||
544 | LIST_APPEND(prefix, ra->prefixes, p); | |
545 | ||
546 | ra->n_prefixes++; | |
547 | ||
548 | (void) in_addr_to_string(AF_INET6, (union in_addr_union*) &p->opt.in6_addr, &addr_p); | |
d601b566 PF |
549 | |
550 | if (!dynamic) { | |
551 | log_radv("Added prefix %s/%d", addr_p, p->opt.prefixlen); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | cur = p; | |
556 | ||
557 | update: | |
558 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
559 | if (r < 0) | |
560 | return r; | |
561 | ||
562 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
563 | valid_until = usec_add(valid, time_now); | |
564 | if (valid_until == USEC_INFINITY) | |
565 | return -EOVERFLOW; | |
566 | ||
567 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
568 | preferred_until = usec_add(preferred, time_now); | |
569 | if (preferred_until == USEC_INFINITY) | |
570 | return -EOVERFLOW; | |
571 | ||
572 | cur->valid_until = valid_until; | |
573 | cur->preferred_until = preferred_until; | |
574 | ||
575 | log_radv("%s prefix %s/%u preferred %s valid %s", | |
576 | cur? "Updated": "Added", | |
577 | addr_p, p->opt.prefixlen, | |
578 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, | |
579 | preferred, USEC_PER_SEC), | |
580 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
581 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
582 | |
583 | return 0; | |
584 | } | |
585 | ||
34c169c4 | 586 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
587 | const struct in6_addr *prefix, |
588 | unsigned char prefixlen) { | |
34c169c4 PF |
589 | sd_radv_prefix *cur, *next; |
590 | ||
591 | assert_return(ra, NULL); | |
592 | assert_return(prefix, NULL); | |
593 | ||
594 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
595 | if (prefixlen != cur->opt.prefixlen) | |
596 | continue; | |
597 | ||
598 | if (!in_addr_equal(AF_INET6, | |
599 | (union in_addr_union *)prefix, | |
600 | (union in_addr_union *)&cur->opt.in6_addr)) | |
601 | continue; | |
602 | ||
603 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
604 | ra->n_prefixes--; | |
62bbbedf | 605 | sd_radv_prefix_unref(cur); |
34c169c4 PF |
606 | |
607 | break; | |
608 | } | |
609 | ||
610 | return cur; | |
611 | } | |
612 | ||
203d4df5 SS |
613 | _public_ int sd_radv_add_route_prefix(sd_radv *ra, sd_radv_route_prefix *p, int dynamic) { |
614 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
615 | usec_t time_now, valid, valid_until; | |
616 | _cleanup_free_ char *pretty = NULL; | |
617 | sd_radv_route_prefix *cur; | |
618 | int r; | |
619 | ||
620 | assert_return(ra, -EINVAL); | |
621 | ||
622 | if (!p) | |
623 | return -EINVAL; | |
624 | ||
625 | (void) in_addr_to_string(AF_INET6, | |
626 | (union in_addr_union*) &p->opt.in6_addr, | |
627 | &pretty); | |
628 | ||
629 | LIST_FOREACH(prefix, cur, ra->route_prefixes) { | |
630 | _cleanup_free_ char *addr = NULL; | |
631 | ||
632 | r = in_addr_prefix_intersect(AF_INET6, | |
633 | (union in_addr_union*) &cur->opt.in6_addr, | |
634 | cur->opt.prefixlen, | |
635 | (union in_addr_union*) &p->opt.in6_addr, | |
636 | p->opt.prefixlen); | |
637 | if (r < 0) | |
638 | return r; | |
639 | if (r == 0) | |
640 | continue; | |
641 | ||
642 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) | |
643 | goto update; | |
644 | ||
645 | (void) in_addr_to_string(AF_INET6, | |
646 | (union in_addr_union*) &cur->opt.in6_addr, | |
647 | &addr); | |
648 | log_radv("IPv6 route prefix %s/%u already configured, ignoring %s/%u", | |
649 | strempty(addr), cur->opt.prefixlen, | |
650 | strempty(pretty), p->opt.prefixlen); | |
651 | ||
652 | return -EEXIST; | |
653 | } | |
654 | ||
655 | p = sd_radv_route_prefix_ref(p); | |
656 | ||
657 | LIST_APPEND(prefix, ra->route_prefixes, p); | |
658 | ra->n_route_prefixes++; | |
659 | ||
660 | cur = p; | |
661 | if (!dynamic) { | |
662 | log_radv("Added prefix %s/%u", strempty(pretty), p->opt.prefixlen); | |
663 | return 0; | |
664 | } | |
665 | ||
666 | update: | |
667 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
668 | if (r < 0) | |
669 | return r; | |
670 | ||
671 | valid = be32toh(p->opt.lifetime) * USEC_PER_SEC; | |
672 | valid_until = usec_add(valid, time_now); | |
673 | if (valid_until == USEC_INFINITY) | |
674 | return -EOVERFLOW; | |
675 | ||
676 | log_radv("%s route prefix %s/%u valid %s", | |
677 | cur? "Updated": "Added", | |
678 | strempty(pretty), p->opt.prefixlen, | |
679 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, valid, USEC_PER_SEC)); | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
e9c6da38 PF |
684 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
685 | const struct in6_addr *dns, size_t n_dns) { | |
686 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
687 | size_t len; | |
688 | ||
689 | assert_return(ra, -EINVAL); | |
690 | assert_return(n_dns < 128, -EINVAL); | |
691 | ||
692 | if (!dns || n_dns == 0) { | |
693 | ra->rdnss = mfree(ra->rdnss); | |
694 | ra->n_rdnss = 0; | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
699 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
700 | ||
701 | opt_rdnss = malloc0(len); | |
702 | if (!opt_rdnss) | |
703 | return -ENOMEM; | |
704 | ||
705 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
706 | opt_rdnss->length = len / 8; | |
707 | opt_rdnss->lifetime = htobe32(lifetime); | |
708 | ||
709 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
710 | ||
1cc6c93a | 711 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
712 | |
713 | ra->n_rdnss = n_dns; | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
e965d6ab PF |
718 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
719 | char **search_list) { | |
720 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
721 | size_t len = 0; | |
722 | char **s; | |
723 | uint8_t *p; | |
724 | ||
725 | assert_return(ra, -EINVAL); | |
726 | ||
97d7974b | 727 | if (strv_isempty(search_list)) { |
e965d6ab | 728 | ra->dnssl = mfree(ra->dnssl); |
e965d6ab PF |
729 | return 0; |
730 | } | |
731 | ||
732 | STRV_FOREACH(s, search_list) | |
733 | len += strlen(*s) + 2; | |
734 | ||
735 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
736 | ||
737 | opt_dnssl = malloc0(len); | |
738 | if (!opt_dnssl) | |
739 | return -ENOMEM; | |
740 | ||
741 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
742 | opt_dnssl->length = len / 8; | |
743 | opt_dnssl->lifetime = htobe32(lifetime); | |
744 | ||
745 | p = (uint8_t *)(opt_dnssl + 1); | |
746 | len -= sizeof(struct sd_radv_opt_dns); | |
747 | ||
748 | STRV_FOREACH(s, search_list) { | |
749 | int r; | |
750 | ||
751 | r = dns_name_to_wire_format(*s, p, len, false); | |
752 | if (r < 0) | |
753 | return r; | |
754 | ||
755 | if (len < (size_t)r) | |
756 | return -ENOBUFS; | |
757 | ||
758 | p += r; | |
759 | len -= r; | |
760 | } | |
761 | ||
1cc6c93a | 762 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
763 | |
764 | return 0; | |
765 | } | |
766 | ||
04473969 | 767 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
d2c8eed2 | 768 | sd_radv_prefix *p; |
04473969 PF |
769 | |
770 | assert_return(ret, -EINVAL); | |
771 | ||
d2c8eed2 | 772 | p = new(sd_radv_prefix, 1); |
04473969 PF |
773 | if (!p) |
774 | return -ENOMEM; | |
775 | ||
d2c8eed2 LP |
776 | *p = (sd_radv_prefix) { |
777 | .n_ref = 1, | |
04473969 | 778 | |
d2c8eed2 LP |
779 | .opt.type = ND_OPT_PREFIX_INFORMATION, |
780 | .opt.length = (sizeof(p->opt) - 1)/8 + 1, | |
781 | .opt.prefixlen = 64, | |
04473969 | 782 | |
d2c8eed2 LP |
783 | /* RFC 4861, Section 6.2.1 */ |
784 | .opt.flags = ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO, | |
204f99d2 | 785 | |
d2c8eed2 LP |
786 | .opt.preferred_lifetime = htobe32(604800), |
787 | .opt.valid_lifetime = htobe32(2592000), | |
788 | }; | |
04473969 | 789 | |
d2c8eed2 | 790 | *ret = p; |
04473969 PF |
791 | return 0; |
792 | } | |
793 | ||
8301aa0b | 794 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree); |
04473969 | 795 | |
f5a5706a | 796 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
797 | unsigned char prefixlen) { |
798 | assert_return(p, -EINVAL); | |
799 | assert_return(in6_addr, -EINVAL); | |
800 | ||
801 | if (prefixlen < 3 || prefixlen > 128) | |
802 | return -EINVAL; | |
803 | ||
804 | if (prefixlen > 64) | |
805 | /* unusual but allowed, log it */ | |
806 | log_radv("Unusual prefix length %d greater than 64", prefixlen); | |
807 | ||
808 | p->opt.in6_addr = *in6_addr; | |
809 | p->opt.prefixlen = prefixlen; | |
810 | ||
811 | return 0; | |
812 | } | |
813 | ||
814 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { | |
815 | assert_return(p, -EINVAL); | |
816 | ||
817 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
822 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
823 | int address_autoconfiguration) { | |
824 | assert_return(p, -EINVAL); | |
825 | ||
826 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
831 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
832 | uint32_t valid_lifetime) { | |
833 | assert_return(p, -EINVAL); | |
834 | ||
835 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
836 | ||
837 | return 0; | |
838 | } | |
839 | ||
840 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
841 | uint32_t preferred_lifetime) { | |
842 | assert_return(p, -EINVAL); | |
843 | ||
844 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
845 | ||
846 | return 0; | |
847 | } | |
203d4df5 SS |
848 | |
849 | _public_ int sd_radv_route_prefix_new(sd_radv_route_prefix **ret) { | |
850 | sd_radv_route_prefix *p; | |
851 | ||
852 | assert_return(ret, -EINVAL); | |
853 | ||
854 | p = new(sd_radv_route_prefix, 1); | |
855 | if (!p) | |
856 | return -ENOMEM; | |
857 | ||
858 | *p = (sd_radv_route_prefix) { | |
859 | .n_ref = 1, | |
860 | ||
861 | .opt.type = SD_RADV_OPT_ROUTE_INFORMATION, | |
862 | .opt.length = DIV_ROUND_UP(sizeof(p->opt), 8), | |
863 | .opt.prefixlen = 64, | |
864 | ||
865 | .opt.lifetime = htobe32(604800), | |
866 | }; | |
867 | ||
868 | *ret = p; | |
869 | return 0; | |
870 | } | |
871 | ||
872 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_route_prefix, sd_radv_route_prefix, mfree); | |
873 | ||
874 | _public_ int sd_radv_prefix_set_route_prefix(sd_radv_route_prefix *p, const struct in6_addr *in6_addr, | |
875 | unsigned char prefixlen) { | |
876 | assert_return(p, -EINVAL); | |
877 | assert_return(in6_addr, -EINVAL); | |
878 | ||
879 | if (prefixlen > 128) | |
880 | return -EINVAL; | |
881 | ||
882 | if (prefixlen > 64) | |
883 | /* unusual but allowed, log it */ | |
884 | log_radv("Unusual prefix length %u greater than 64", prefixlen); | |
885 | ||
886 | p->opt.in6_addr = *in6_addr; | |
887 | p->opt.prefixlen = prefixlen; | |
888 | ||
889 | return 0; | |
890 | } | |
891 | ||
892 | _public_ int sd_radv_route_prefix_set_lifetime(sd_radv_route_prefix *p, uint32_t valid_lifetime) { | |
893 | assert_return(p, -EINVAL); | |
894 | ||
895 | p->opt.lifetime = htobe32(valid_lifetime); | |
896 | ||
897 | return 0; | |
898 | } |