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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
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" |
61a9fa8f | 22 | #include "network-common.h" |
04473969 | 23 | #include "radv-internal.h" |
5cfa2c3d | 24 | #include "random-util.h" |
04473969 PF |
25 | #include "socket-util.h" |
26 | #include "string-util.h" | |
e965d6ab | 27 | #include "strv.h" |
04473969 | 28 | |
204f99d2 PF |
29 | _public_ int sd_radv_new(sd_radv **ret) { |
30 | _cleanup_(sd_radv_unrefp) sd_radv *ra = NULL; | |
31 | ||
32 | assert_return(ret, -EINVAL); | |
33 | ||
78f9d24f | 34 | ra = new(sd_radv, 1); |
204f99d2 PF |
35 | if (!ra) |
36 | return -ENOMEM; | |
37 | ||
78f9d24f YW |
38 | *ra = (sd_radv) { |
39 | .n_ref = 1, | |
40 | .fd = -1, | |
41 | }; | |
204f99d2 | 42 | |
1cc6c93a | 43 | *ret = TAKE_PTR(ra); |
204f99d2 PF |
44 | |
45 | return 0; | |
46 | } | |
47 | ||
48 | _public_ int sd_radv_attach_event(sd_radv *ra, sd_event *event, int64_t priority) { | |
49 | int r; | |
50 | ||
51 | assert_return(ra, -EINVAL); | |
52 | assert_return(!ra->event, -EBUSY); | |
53 | ||
54 | if (event) | |
55 | ra->event = sd_event_ref(event); | |
56 | else { | |
57 | r = sd_event_default(&ra->event); | |
58 | if (r < 0) | |
59 | return 0; | |
60 | } | |
61 | ||
62 | ra->event_priority = priority; | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | _public_ int sd_radv_detach_event(sd_radv *ra) { | |
68 | ||
69 | assert_return(ra, -EINVAL); | |
70 | ||
71 | ra->event = sd_event_unref(ra->event); | |
72 | return 0; | |
73 | } | |
74 | ||
75 | _public_ sd_event *sd_radv_get_event(sd_radv *ra) { | |
76 | assert_return(ra, NULL); | |
77 | ||
78 | return ra->event; | |
79 | } | |
80 | ||
96fe813c YW |
81 | _public_ int sd_radv_is_running(sd_radv *ra) { |
82 | assert_return(ra, false); | |
83 | ||
84 | return ra->state != SD_RADV_STATE_IDLE; | |
85 | } | |
86 | ||
204fb681 | 87 | static void radv_reset(sd_radv *ra) { |
c4b6dda0 | 88 | assert(ra); |
204fb681 | 89 | |
807a8ede | 90 | (void) event_source_disable(ra->timeout_event_source); |
204fb681 | 91 | |
88d5a3db PF |
92 | ra->recv_event_source = |
93 | sd_event_source_unref(ra->recv_event_source); | |
94 | ||
204fb681 PF |
95 | ra->ra_sent = 0; |
96 | } | |
97 | ||
8301aa0b | 98 | static sd_radv *radv_free(sd_radv *ra) { |
e866e17b LP |
99 | if (!ra) |
100 | return NULL; | |
204f99d2 PF |
101 | |
102 | while (ra->prefixes) { | |
103 | sd_radv_prefix *p = ra->prefixes; | |
104 | ||
105 | LIST_REMOVE(prefix, ra->prefixes, p); | |
106 | sd_radv_prefix_unref(p); | |
107 | } | |
108 | ||
69d7eba1 YW |
109 | while (ra->route_prefixes) { |
110 | sd_radv_route_prefix *p = ra->route_prefixes; | |
111 | ||
112 | LIST_REMOVE(prefix, ra->route_prefixes, p); | |
113 | sd_radv_route_prefix_unref(p); | |
114 | } | |
115 | ||
e9c6da38 | 116 | free(ra->rdnss); |
f9aa5417 | 117 | free(ra->dnssl); |
e9c6da38 | 118 | |
807a8ede YW |
119 | ra->timeout_event_source = sd_event_source_unref(ra->timeout_event_source); |
120 | ||
204fb681 PF |
121 | radv_reset(ra); |
122 | ||
204f99d2 | 123 | sd_radv_detach_event(ra); |
c4b6dda0 LP |
124 | |
125 | ra->fd = safe_close(ra->fd); | |
61a9fa8f | 126 | free(ra->ifname); |
c4b6dda0 | 127 | |
204f99d2 PF |
128 | return mfree(ra); |
129 | } | |
130 | ||
8301aa0b YW |
131 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv, sd_radv, radv_free); |
132 | ||
83ef9d14 | 133 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, uint32_t router_lifetime) { |
203d4df5 | 134 | sd_radv_route_prefix *rt; |
77baf5ae PF |
135 | sd_radv_prefix *p; |
136 | struct sockaddr_in6 dst_addr = { | |
137 | .sin6_family = AF_INET6, | |
138 | .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
139 | }; | |
140 | struct nd_router_advert adv = {}; | |
141 | struct { | |
142 | struct nd_opt_hdr opthdr; | |
143 | struct ether_addr slladdr; | |
144 | } _packed_ opt_mac = { | |
145 | .opthdr = { | |
146 | .nd_opt_type = ND_OPT_SOURCE_LINKADDR, | |
147 | .nd_opt_len = (sizeof(struct nd_opt_hdr) + | |
148 | sizeof(struct ether_addr) - 1) /8 + 1, | |
149 | }, | |
150 | }; | |
151 | struct nd_opt_mtu opt_mtu = { | |
152 | .nd_opt_mtu_type = ND_OPT_MTU, | |
153 | .nd_opt_mtu_len = 1, | |
154 | }; | |
203d4df5 | 155 | /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, N routes, RDNSS |
6852c0f6 | 156 | and DNSSL */ |
203d4df5 | 157 | struct iovec iov[5 + ra->n_prefixes + ra->n_route_prefixes]; |
77baf5ae PF |
158 | struct msghdr msg = { |
159 | .msg_name = &dst_addr, | |
160 | .msg_namelen = sizeof(dst_addr), | |
161 | .msg_iov = iov, | |
162 | }; | |
d601b566 PF |
163 | usec_t time_now; |
164 | int r; | |
165 | ||
dc0ec5e2 LP |
166 | assert(ra); |
167 | ||
d601b566 PF |
168 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
169 | if (r < 0) | |
170 | return r; | |
77baf5ae | 171 | |
94876904 | 172 | if (dst && in6_addr_is_set(dst)) |
77baf5ae | 173 | dst_addr.sin6_addr = *dst; |
88d5a3db | 174 | |
77baf5ae PF |
175 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
176 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
177 | adv.nd_ra_flags_reserved = ra->flags; | |
178 | adv.nd_ra_router_lifetime = htobe16(router_lifetime); | |
5cfa2c3d | 179 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&adv, sizeof(adv)); |
77baf5ae PF |
180 | |
181 | /* MAC address is optional, either because the link does not use L2 | |
182 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
ae25915d | 183 | if (!ether_addr_is_null(&ra->mac_addr)) { |
77baf5ae | 184 | opt_mac.slladdr = ra->mac_addr; |
5cfa2c3d | 185 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&opt_mac, sizeof(opt_mac)); |
77baf5ae PF |
186 | } |
187 | ||
188 | if (ra->mtu) { | |
189 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
5cfa2c3d | 190 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&opt_mtu, sizeof(opt_mtu)); |
77baf5ae PF |
191 | } |
192 | ||
193 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
194 | if (p->valid_until) { |
195 | ||
196 | if (time_now > p->valid_until) | |
197 | p->opt.valid_lifetime = 0; | |
198 | else | |
199 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
200 | ||
201 | if (time_now > p->preferred_until) | |
202 | p->opt.preferred_lifetime = 0; | |
203 | else | |
204 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
205 | } | |
5cfa2c3d | 206 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&p->opt, sizeof(p->opt)); |
77baf5ae PF |
207 | } |
208 | ||
203d4df5 SS |
209 | LIST_FOREACH(prefix, rt, ra->route_prefixes) |
210 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&rt->opt, sizeof(rt->opt)); | |
211 | ||
5cfa2c3d LP |
212 | if (ra->rdnss) |
213 | iov[msg.msg_iovlen++] = IOVEC_MAKE(ra->rdnss, ra->rdnss->length * 8); | |
e9c6da38 | 214 | |
5cfa2c3d LP |
215 | if (ra->dnssl) |
216 | iov[msg.msg_iovlen++] = IOVEC_MAKE(ra->dnssl, ra->dnssl->length * 8); | |
e965d6ab | 217 | |
77baf5ae PF |
218 | if (sendmsg(ra->fd, &msg, 0) < 0) |
219 | return -errno; | |
204fb681 | 220 | |
77baf5ae | 221 | return 0; |
204fb681 PF |
222 | } |
223 | ||
88d5a3db PF |
224 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
225 | sd_radv *ra = userdata; | |
226 | _cleanup_free_ char *addr = NULL; | |
227 | struct in6_addr src; | |
228 | triple_timestamp timestamp; | |
229 | int r; | |
230 | ssize_t buflen; | |
231 | _cleanup_free_ char *buf = NULL; | |
232 | ||
233 | assert(s); | |
234 | assert(ra); | |
235 | assert(ra->event); | |
236 | ||
237 | buflen = next_datagram_size_fd(fd); | |
cfffddea LP |
238 | if (buflen < 0) |
239 | return (int) buflen; | |
88d5a3db PF |
240 | |
241 | buf = new0(char, buflen); | |
242 | if (!buf) | |
e55a6eae | 243 | return -ENOMEM; |
88d5a3db PF |
244 | |
245 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
246 | if (r < 0) { | |
247 | switch (r) { | |
248 | case -EADDRNOTAVAIL: | |
c633628d | 249 | (void) in_addr_to_string(AF_INET6, (const union in_addr_union*) &src, &addr); |
35388783 | 250 | log_radv(ra, "Received RS from non-link-local address %s. Ignoring", addr); |
88d5a3db PF |
251 | break; |
252 | ||
253 | case -EMULTIHOP: | |
35388783 | 254 | log_radv(ra, "Received RS with invalid hop limit. Ignoring."); |
88d5a3db PF |
255 | break; |
256 | ||
257 | case -EPFNOSUPPORT: | |
35388783 | 258 | log_radv(ra, "Received invalid source address from ICMPv6 socket. Ignoring."); |
88d5a3db PF |
259 | break; |
260 | ||
8eb41f4c LP |
261 | case -EAGAIN: /* ignore spurious wakeups */ |
262 | break; | |
263 | ||
88d5a3db | 264 | default: |
35388783 | 265 | log_radv_errno(ra, r, "Unexpected error receiving from ICMPv6 socket, Ignoring: %m"); |
88d5a3db PF |
266 | break; |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
cfffddea | 272 | if ((size_t) buflen < sizeof(struct nd_router_solicit)) { |
35388783 | 273 | log_radv(ra, "Too short packet received, ignoring"); |
cfffddea LP |
274 | return 0; |
275 | } | |
276 | ||
c633628d | 277 | (void) in_addr_to_string(AF_INET6, (const union in_addr_union*) &src, &addr); |
88d5a3db PF |
278 | |
279 | r = radv_send(ra, &src, ra->lifetime); | |
280 | if (r < 0) | |
35388783 | 281 | log_radv_errno(ra, r, "Unable to send solicited Router Advertisement to %s, ignoring: %m", strnull(addr)); |
88d5a3db | 282 | else |
35388783 | 283 | log_radv(ra, "Sent solicited Router Advertisement to %s", strnull(addr)); |
88d5a3db PF |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
204fb681 PF |
288 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
289 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
290 | ||
ef90b6a4 GM |
291 | /* RFC 4861: min must be no less than 3s, max must be no less than 4s */ |
292 | min = MAX(min, 3*USEC_PER_SEC); | |
293 | max = MAX(max, 4*USEC_PER_SEC); | |
294 | ||
204fb681 PF |
295 | return min + (random_u32() % (max - min)); |
296 | } | |
297 | ||
298 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
299 | int r; | |
300 | sd_radv *ra = userdata; | |
301 | usec_t min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
302 | usec_t max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
303 | usec_t time_now, timeout; | |
204fb681 PF |
304 | |
305 | assert(s); | |
306 | assert(ra); | |
307 | assert(ra->event); | |
308 | ||
204fb681 PF |
309 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
310 | if (r < 0) | |
311 | goto fail; | |
312 | ||
313 | r = radv_send(ra, NULL, ra->lifetime); | |
314 | if (r < 0) | |
35388783 | 315 | log_radv_errno(ra, r, "Unable to send Router Advertisement: %m"); |
204fb681 PF |
316 | |
317 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
318 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
319 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
320 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
321 | } | |
322 | ||
ef90b6a4 GM |
323 | /* RFC 4861, Section 6.2.1, lifetime must be at least MaxRtrAdvInterval, |
324 | so lower the interval here */ | |
325 | if (ra->lifetime > 0 && (ra->lifetime * USEC_PER_SEC) < max_timeout) { | |
326 | max_timeout = ra->lifetime * USEC_PER_SEC; | |
327 | min_timeout = max_timeout / 3; | |
328 | } | |
329 | ||
204fb681 | 330 | timeout = radv_compute_timeout(min_timeout, max_timeout); |
5291f26d | 331 | log_radv(ra, "Next Router Advertisement in %s", FORMAT_TIMESPAN(timeout, USEC_PER_SEC)); |
204fb681 | 332 | |
807a8ede YW |
333 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
334 | clock_boottime_or_monotonic(), | |
335 | time_now + timeout, MSEC_PER_SEC, | |
336 | radv_timeout, ra, | |
337 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
338 | if (r < 0) |
339 | goto fail; | |
340 | ||
341 | ra->ra_sent++; | |
342 | ||
807a8ede YW |
343 | return 0; |
344 | ||
204fb681 | 345 | fail: |
290696e5 | 346 | sd_radv_stop(ra); |
204fb681 PF |
347 | |
348 | return 0; | |
349 | } | |
350 | ||
290696e5 | 351 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
352 | int r; |
353 | ||
c8bae363 YW |
354 | if (!ra) |
355 | return 0; | |
204f99d2 | 356 | |
6f8a8b84 SS |
357 | if (ra->state == SD_RADV_STATE_IDLE) |
358 | return 0; | |
359 | ||
35388783 | 360 | log_radv(ra, "Stopping IPv6 Router Advertisement daemon"); |
204f99d2 | 361 | |
290696e5 YW |
362 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
363 | with zero lifetime */ | |
364 | r = radv_send(ra, NULL, 0); | |
365 | if (r < 0) | |
35388783 | 366 | log_radv_errno(ra, r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); |
204fb681 PF |
367 | |
368 | radv_reset(ra); | |
77baf5ae | 369 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
370 | ra->state = SD_RADV_STATE_IDLE; |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | _public_ int sd_radv_start(sd_radv *ra) { | |
f474884c | 376 | int r; |
204fb681 | 377 | |
204f99d2 PF |
378 | assert_return(ra, -EINVAL); |
379 | assert_return(ra->event, -EINVAL); | |
380 | assert_return(ra->ifindex > 0, -EINVAL); | |
381 | ||
382 | if (ra->state != SD_RADV_STATE_IDLE) | |
383 | return 0; | |
384 | ||
807a8ede YW |
385 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
386 | clock_boottime_or_monotonic(), | |
387 | 0, 0, | |
388 | radv_timeout, ra, | |
389 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
390 | if (r < 0) |
391 | goto fail; | |
392 | ||
77baf5ae PF |
393 | r = icmp6_bind_router_advertisement(ra->ifindex); |
394 | if (r < 0) | |
395 | goto fail; | |
396 | ||
397 | ra->fd = r; | |
88d5a3db PF |
398 | |
399 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
400 | if (r < 0) | |
401 | goto fail; | |
402 | ||
403 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
404 | if (r < 0) | |
405 | goto fail; | |
406 | ||
407 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 408 | |
204f99d2 PF |
409 | ra->state = SD_RADV_STATE_ADVERTISING; |
410 | ||
35388783 | 411 | log_radv(ra, "Started IPv6 Router Advertisement daemon"); |
204f99d2 PF |
412 | |
413 | return 0; | |
204fb681 PF |
414 | |
415 | fail: | |
416 | radv_reset(ra); | |
417 | ||
418 | return r; | |
204f99d2 PF |
419 | } |
420 | ||
421 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
422 | assert_return(ra, -EINVAL); | |
7fa69c0a | 423 | assert_return(ifindex > 0, -EINVAL); |
204f99d2 PF |
424 | |
425 | if (ra->state != SD_RADV_STATE_IDLE) | |
426 | return -EBUSY; | |
427 | ||
428 | ra->ifindex = ifindex; | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
61a9fa8f YW |
433 | int sd_radv_set_ifname(sd_radv *ra, const char *ifname) { |
434 | assert_return(ra, -EINVAL); | |
435 | assert_return(ifname, -EINVAL); | |
436 | ||
437 | if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) | |
438 | return -EINVAL; | |
439 | ||
440 | return free_and_strdup(&ra->ifname, ifname); | |
441 | } | |
442 | ||
443 | const char *sd_radv_get_ifname(sd_radv *ra) { | |
444 | if (!ra) | |
445 | return NULL; | |
446 | ||
447 | return get_ifname(ra->ifindex, &ra->ifname); | |
448 | } | |
449 | ||
204f99d2 PF |
450 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { |
451 | assert_return(ra, -EINVAL); | |
452 | ||
453 | if (ra->state != SD_RADV_STATE_IDLE) | |
454 | return -EBUSY; | |
455 | ||
456 | if (mac_addr) | |
457 | ra->mac_addr = *mac_addr; | |
458 | else | |
459 | zero(ra->mac_addr); | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
465 | assert_return(ra, -EINVAL); | |
466 | assert_return(mtu >= 1280, -EINVAL); | |
467 | ||
204f99d2 PF |
468 | ra->mtu = mtu; |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
474 | assert_return(ra, -EINVAL); | |
475 | ||
476 | if (ra->state != SD_RADV_STATE_IDLE) | |
477 | return -EBUSY; | |
478 | ||
479 | ra->hop_limit = hop_limit; | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
ac138551 | 484 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint16_t router_lifetime) { |
204f99d2 PF |
485 | assert_return(ra, -EINVAL); |
486 | ||
487 | if (ra->state != SD_RADV_STATE_IDLE) | |
488 | return -EBUSY; | |
489 | ||
ac138551 YW |
490 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set |
491 | * to (00) by the sender..." */ | |
204f99d2 PF |
492 | if (router_lifetime == 0 && |
493 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
494 | return -ETIME; | |
495 | ||
496 | ra->lifetime = router_lifetime; | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
502 | assert_return(ra, -EINVAL); | |
503 | ||
504 | if (ra->state != SD_RADV_STATE_IDLE) | |
505 | return -EBUSY; | |
506 | ||
507 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
513 | assert_return(ra, -EINVAL); | |
514 | ||
515 | if (ra->state != SD_RADV_STATE_IDLE) | |
516 | return -EBUSY; | |
517 | ||
518 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
204f99d2 PF |
524 | assert_return(ra, -EINVAL); |
525 | assert_return(IN_SET(preference, | |
526 | SD_NDISC_PREFERENCE_LOW, | |
527 | SD_NDISC_PREFERENCE_MEDIUM, | |
528 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
529 | ||
dd1b1870 YW |
530 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set |
531 | * to (00) by the sender..." */ | |
532 | if (ra->lifetime == 0 && preference != SD_NDISC_PREFERENCE_MEDIUM) | |
533 | return -EINVAL; | |
534 | ||
204f99d2 PF |
535 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); |
536 | ||
dd1b1870 | 537 | return 0; |
204f99d2 PF |
538 | } |
539 | ||
a3a98776 | 540 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, int dynamic) { |
204f99d2 | 541 | sd_radv_prefix *cur; |
d601b566 | 542 | int r; |
204f99d2 | 543 | _cleanup_free_ char *addr_p = NULL; |
d601b566 | 544 | usec_t time_now, valid, preferred, valid_until, preferred_until; |
204f99d2 PF |
545 | |
546 | assert_return(ra, -EINVAL); | |
547 | ||
548 | if (!p) | |
549 | return -EINVAL; | |
550 | ||
59ea6e57 | 551 | /* Refuse prefixes that don't have a prefix set */ |
94876904 | 552 | if (in6_addr_is_null(&p->opt.in6_addr)) |
59ea6e57 LP |
553 | return -ENOEXEC; |
554 | ||
5380707a | 555 | (void) in_addr_prefix_to_string(AF_INET6, |
c633628d | 556 | (const union in_addr_union*) &p->opt.in6_addr, |
5380707a YW |
557 | p->opt.prefixlen, &addr_p); |
558 | ||
204f99d2 | 559 | LIST_FOREACH(prefix, cur, ra->prefixes) { |
204f99d2 PF |
560 | |
561 | r = in_addr_prefix_intersect(AF_INET6, | |
c633628d | 562 | (const union in_addr_union*) &cur->opt.in6_addr, |
204f99d2 | 563 | cur->opt.prefixlen, |
c633628d | 564 | (const union in_addr_union*) &p->opt.in6_addr, |
204f99d2 | 565 | p->opt.prefixlen); |
5380707a YW |
566 | if (r < 0) |
567 | return r; | |
568 | if (r == 0) | |
569 | continue; | |
204f99d2 | 570 | |
5380707a YW |
571 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
572 | goto update; | |
d601b566 | 573 | |
5380707a YW |
574 | _cleanup_free_ char *addr_cur = NULL; |
575 | (void) in_addr_prefix_to_string(AF_INET6, | |
c633628d | 576 | (const union in_addr_union*) &cur->opt.in6_addr, |
5380707a | 577 | cur->opt.prefixlen, &addr_cur); |
35388783 YW |
578 | return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST), |
579 | "IPv6 prefix %s already configured, ignoring %s", | |
580 | strna(addr_cur), strna(addr_p)); | |
204f99d2 PF |
581 | } |
582 | ||
583 | p = sd_radv_prefix_ref(p); | |
584 | ||
585 | LIST_APPEND(prefix, ra->prefixes, p); | |
586 | ||
587 | ra->n_prefixes++; | |
588 | ||
d601b566 | 589 | if (!dynamic) { |
35388783 | 590 | log_radv(ra, "Added prefix %s", strna(addr_p)); |
d601b566 PF |
591 | return 0; |
592 | } | |
593 | ||
594 | cur = p; | |
595 | ||
97efde65 MM |
596 | /* If RAs have already been sent, send an RA immediately to announce the newly-added prefix */ |
597 | if (ra->ra_sent > 0) { | |
6333aa9d LP |
598 | r = radv_send(ra, NULL, ra->lifetime); |
599 | if (r < 0) | |
35388783 | 600 | log_radv_errno(ra, r, "Unable to send Router Advertisement for added prefix: %m"); |
6333aa9d | 601 | else |
35388783 | 602 | log_radv(ra, "Sent Router Advertisement for added prefix"); |
97efde65 MM |
603 | } |
604 | ||
d601b566 PF |
605 | update: |
606 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
607 | if (r < 0) | |
608 | return r; | |
609 | ||
610 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
611 | valid_until = usec_add(valid, time_now); | |
612 | if (valid_until == USEC_INFINITY) | |
613 | return -EOVERFLOW; | |
614 | ||
615 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
616 | preferred_until = usec_add(preferred, time_now); | |
617 | if (preferred_until == USEC_INFINITY) | |
618 | return -EOVERFLOW; | |
619 | ||
620 | cur->valid_until = valid_until; | |
621 | cur->preferred_until = preferred_until; | |
622 | ||
35388783 | 623 | log_radv(ra, "Updated prefix %s preferred %s valid %s", |
5380707a | 624 | strna(addr_p), |
5291f26d ZJS |
625 | FORMAT_TIMESPAN(preferred, USEC_PER_SEC), |
626 | FORMAT_TIMESPAN(valid, USEC_PER_SEC)); | |
204f99d2 PF |
627 | |
628 | return 0; | |
629 | } | |
630 | ||
34c169c4 | 631 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
632 | const struct in6_addr *prefix, |
633 | unsigned char prefixlen) { | |
34c169c4 PF |
634 | sd_radv_prefix *cur, *next; |
635 | ||
636 | assert_return(ra, NULL); | |
637 | assert_return(prefix, NULL); | |
638 | ||
639 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
640 | if (prefixlen != cur->opt.prefixlen) | |
641 | continue; | |
642 | ||
94876904 | 643 | if (!in6_addr_equal(prefix, &cur->opt.in6_addr)) |
34c169c4 PF |
644 | continue; |
645 | ||
646 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
647 | ra->n_prefixes--; | |
62bbbedf | 648 | sd_radv_prefix_unref(cur); |
34c169c4 PF |
649 | |
650 | break; | |
651 | } | |
652 | ||
653 | return cur; | |
654 | } | |
655 | ||
203d4df5 | 656 | _public_ int sd_radv_add_route_prefix(sd_radv *ra, sd_radv_route_prefix *p, int dynamic) { |
203d4df5 SS |
657 | usec_t time_now, valid, valid_until; |
658 | _cleanup_free_ char *pretty = NULL; | |
659 | sd_radv_route_prefix *cur; | |
660 | int r; | |
661 | ||
662 | assert_return(ra, -EINVAL); | |
663 | ||
664 | if (!p) | |
665 | return -EINVAL; | |
666 | ||
5380707a | 667 | (void) in_addr_prefix_to_string(AF_INET6, |
c633628d | 668 | (const union in_addr_union*) &p->opt.in6_addr, |
5380707a | 669 | p->opt.prefixlen, &pretty); |
203d4df5 SS |
670 | |
671 | LIST_FOREACH(prefix, cur, ra->route_prefixes) { | |
203d4df5 SS |
672 | |
673 | r = in_addr_prefix_intersect(AF_INET6, | |
c633628d | 674 | (const union in_addr_union*) &cur->opt.in6_addr, |
203d4df5 | 675 | cur->opt.prefixlen, |
c633628d | 676 | (const union in_addr_union*) &p->opt.in6_addr, |
203d4df5 SS |
677 | p->opt.prefixlen); |
678 | if (r < 0) | |
679 | return r; | |
680 | if (r == 0) | |
681 | continue; | |
682 | ||
683 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) | |
684 | goto update; | |
685 | ||
5380707a YW |
686 | _cleanup_free_ char *addr = NULL; |
687 | (void) in_addr_prefix_to_string(AF_INET6, | |
c633628d | 688 | (const union in_addr_union*) &cur->opt.in6_addr, |
5380707a | 689 | cur->opt.prefixlen, &addr); |
35388783 YW |
690 | return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST), |
691 | "IPv6 route prefix %s already configured, ignoring %s", | |
692 | strna(addr), strna(pretty)); | |
203d4df5 SS |
693 | } |
694 | ||
695 | p = sd_radv_route_prefix_ref(p); | |
696 | ||
697 | LIST_APPEND(prefix, ra->route_prefixes, p); | |
698 | ra->n_route_prefixes++; | |
699 | ||
203d4df5 | 700 | if (!dynamic) { |
35388783 | 701 | log_radv(ra, "Added prefix %s", strna(pretty)); |
203d4df5 SS |
702 | return 0; |
703 | } | |
704 | ||
97efde65 MM |
705 | /* If RAs have already been sent, send an RA immediately to announce the newly-added route prefix */ |
706 | if (ra->ra_sent > 0) { | |
6333aa9d LP |
707 | r = radv_send(ra, NULL, ra->lifetime); |
708 | if (r < 0) | |
35388783 | 709 | log_radv_errno(ra, r, "Unable to send Router Advertisement for added route prefix: %m"); |
6333aa9d | 710 | else |
35388783 | 711 | log_radv(ra, "Sent Router Advertisement for added route prefix"); |
97efde65 MM |
712 | } |
713 | ||
203d4df5 SS |
714 | update: |
715 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
716 | if (r < 0) | |
717 | return r; | |
718 | ||
719 | valid = be32toh(p->opt.lifetime) * USEC_PER_SEC; | |
720 | valid_until = usec_add(valid, time_now); | |
721 | if (valid_until == USEC_INFINITY) | |
722 | return -EOVERFLOW; | |
723 | ||
35388783 | 724 | log_radv(ra, "Updated route prefix %s valid %s", |
5380707a | 725 | strna(pretty), |
5291f26d | 726 | FORMAT_TIMESPAN(valid, USEC_PER_SEC)); |
203d4df5 SS |
727 | |
728 | return 0; | |
729 | } | |
730 | ||
e9c6da38 PF |
731 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
732 | const struct in6_addr *dns, size_t n_dns) { | |
733 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
734 | size_t len; | |
735 | ||
736 | assert_return(ra, -EINVAL); | |
737 | assert_return(n_dns < 128, -EINVAL); | |
738 | ||
739 | if (!dns || n_dns == 0) { | |
740 | ra->rdnss = mfree(ra->rdnss); | |
741 | ra->n_rdnss = 0; | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
746 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
747 | ||
748 | opt_rdnss = malloc0(len); | |
749 | if (!opt_rdnss) | |
750 | return -ENOMEM; | |
751 | ||
752 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
753 | opt_rdnss->length = len / 8; | |
754 | opt_rdnss->lifetime = htobe32(lifetime); | |
755 | ||
756 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
757 | ||
1cc6c93a | 758 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
759 | |
760 | ra->n_rdnss = n_dns; | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
e965d6ab PF |
765 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
766 | char **search_list) { | |
767 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
768 | size_t len = 0; | |
769 | char **s; | |
770 | uint8_t *p; | |
771 | ||
772 | assert_return(ra, -EINVAL); | |
773 | ||
97d7974b | 774 | if (strv_isempty(search_list)) { |
e965d6ab | 775 | ra->dnssl = mfree(ra->dnssl); |
e965d6ab PF |
776 | return 0; |
777 | } | |
778 | ||
779 | STRV_FOREACH(s, search_list) | |
780 | len += strlen(*s) + 2; | |
781 | ||
782 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
783 | ||
784 | opt_dnssl = malloc0(len); | |
785 | if (!opt_dnssl) | |
786 | return -ENOMEM; | |
787 | ||
788 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
789 | opt_dnssl->length = len / 8; | |
790 | opt_dnssl->lifetime = htobe32(lifetime); | |
791 | ||
792 | p = (uint8_t *)(opt_dnssl + 1); | |
793 | len -= sizeof(struct sd_radv_opt_dns); | |
794 | ||
795 | STRV_FOREACH(s, search_list) { | |
796 | int r; | |
797 | ||
798 | r = dns_name_to_wire_format(*s, p, len, false); | |
799 | if (r < 0) | |
800 | return r; | |
801 | ||
802 | if (len < (size_t)r) | |
803 | return -ENOBUFS; | |
804 | ||
805 | p += r; | |
806 | len -= r; | |
807 | } | |
808 | ||
1cc6c93a | 809 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
810 | |
811 | return 0; | |
812 | } | |
813 | ||
04473969 | 814 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
d2c8eed2 | 815 | sd_radv_prefix *p; |
04473969 PF |
816 | |
817 | assert_return(ret, -EINVAL); | |
818 | ||
d2c8eed2 | 819 | p = new(sd_radv_prefix, 1); |
04473969 PF |
820 | if (!p) |
821 | return -ENOMEM; | |
822 | ||
d2c8eed2 LP |
823 | *p = (sd_radv_prefix) { |
824 | .n_ref = 1, | |
04473969 | 825 | |
d2c8eed2 LP |
826 | .opt.type = ND_OPT_PREFIX_INFORMATION, |
827 | .opt.length = (sizeof(p->opt) - 1)/8 + 1, | |
828 | .opt.prefixlen = 64, | |
04473969 | 829 | |
d2c8eed2 LP |
830 | /* RFC 4861, Section 6.2.1 */ |
831 | .opt.flags = ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO, | |
204f99d2 | 832 | |
d2c8eed2 LP |
833 | .opt.preferred_lifetime = htobe32(604800), |
834 | .opt.valid_lifetime = htobe32(2592000), | |
835 | }; | |
04473969 | 836 | |
d2c8eed2 | 837 | *ret = p; |
04473969 PF |
838 | return 0; |
839 | } | |
840 | ||
8301aa0b | 841 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree); |
04473969 | 842 | |
f5a5706a | 843 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
844 | unsigned char prefixlen) { |
845 | assert_return(p, -EINVAL); | |
846 | assert_return(in6_addr, -EINVAL); | |
847 | ||
848 | if (prefixlen < 3 || prefixlen > 128) | |
849 | return -EINVAL; | |
850 | ||
851 | if (prefixlen > 64) | |
852 | /* unusual but allowed, log it */ | |
35388783 | 853 | log_radv(NULL, "Unusual prefix length %d greater than 64", prefixlen); |
04473969 PF |
854 | |
855 | p->opt.in6_addr = *in6_addr; | |
856 | p->opt.prefixlen = prefixlen; | |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
34332af2 SS |
861 | _public_ int sd_radv_prefix_get_prefix(sd_radv_prefix *p, struct in6_addr *ret_in6_addr, |
862 | unsigned char *ret_prefixlen) { | |
863 | assert_return(p, -EINVAL); | |
864 | assert_return(ret_in6_addr, -EINVAL); | |
865 | assert_return(ret_prefixlen, -EINVAL); | |
866 | ||
867 | *ret_in6_addr = p->opt.in6_addr; | |
868 | *ret_prefixlen = p->opt.prefixlen; | |
869 | ||
870 | return 0; | |
871 | } | |
872 | ||
04473969 PF |
873 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { |
874 | assert_return(p, -EINVAL); | |
875 | ||
876 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
877 | ||
878 | return 0; | |
879 | } | |
880 | ||
881 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
882 | int address_autoconfiguration) { | |
883 | assert_return(p, -EINVAL); | |
884 | ||
885 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
886 | ||
887 | return 0; | |
888 | } | |
889 | ||
890 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
891 | uint32_t valid_lifetime) { | |
892 | assert_return(p, -EINVAL); | |
893 | ||
894 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
900 | uint32_t preferred_lifetime) { | |
901 | assert_return(p, -EINVAL); | |
902 | ||
903 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
904 | ||
905 | return 0; | |
906 | } | |
203d4df5 SS |
907 | |
908 | _public_ int sd_radv_route_prefix_new(sd_radv_route_prefix **ret) { | |
909 | sd_radv_route_prefix *p; | |
910 | ||
911 | assert_return(ret, -EINVAL); | |
912 | ||
913 | p = new(sd_radv_route_prefix, 1); | |
914 | if (!p) | |
915 | return -ENOMEM; | |
916 | ||
917 | *p = (sd_radv_route_prefix) { | |
918 | .n_ref = 1, | |
919 | ||
920 | .opt.type = SD_RADV_OPT_ROUTE_INFORMATION, | |
921 | .opt.length = DIV_ROUND_UP(sizeof(p->opt), 8), | |
922 | .opt.prefixlen = 64, | |
923 | ||
924 | .opt.lifetime = htobe32(604800), | |
925 | }; | |
926 | ||
927 | *ret = p; | |
928 | return 0; | |
929 | } | |
930 | ||
931 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_route_prefix, sd_radv_route_prefix, mfree); | |
932 | ||
933 | _public_ int sd_radv_prefix_set_route_prefix(sd_radv_route_prefix *p, const struct in6_addr *in6_addr, | |
934 | unsigned char prefixlen) { | |
935 | assert_return(p, -EINVAL); | |
936 | assert_return(in6_addr, -EINVAL); | |
937 | ||
938 | if (prefixlen > 128) | |
939 | return -EINVAL; | |
940 | ||
941 | if (prefixlen > 64) | |
942 | /* unusual but allowed, log it */ | |
35388783 | 943 | log_radv(NULL, "Unusual prefix length %u greater than 64", prefixlen); |
203d4df5 SS |
944 | |
945 | p->opt.in6_addr = *in6_addr; | |
946 | p->opt.prefixlen = prefixlen; | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | _public_ int sd_radv_route_prefix_set_lifetime(sd_radv_route_prefix *p, uint32_t valid_lifetime) { | |
952 | assert_return(p, -EINVAL); | |
953 | ||
954 | p->opt.lifetime = htobe32(valid_lifetime); | |
955 | ||
956 | return 0; | |
957 | } |