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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; | |
304 | char time_string[FORMAT_TIMESPAN_MAX]; | |
305 | ||
306 | assert(s); | |
307 | assert(ra); | |
308 | assert(ra->event); | |
309 | ||
204fb681 PF |
310 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
311 | if (r < 0) | |
312 | goto fail; | |
313 | ||
314 | r = radv_send(ra, NULL, ra->lifetime); | |
315 | if (r < 0) | |
35388783 | 316 | log_radv_errno(ra, r, "Unable to send Router Advertisement: %m"); |
204fb681 PF |
317 | |
318 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
319 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
320 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
321 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
322 | } | |
323 | ||
ef90b6a4 GM |
324 | /* RFC 4861, Section 6.2.1, lifetime must be at least MaxRtrAdvInterval, |
325 | so lower the interval here */ | |
326 | if (ra->lifetime > 0 && (ra->lifetime * USEC_PER_SEC) < max_timeout) { | |
327 | max_timeout = ra->lifetime * USEC_PER_SEC; | |
328 | min_timeout = max_timeout / 3; | |
329 | } | |
330 | ||
204fb681 PF |
331 | timeout = radv_compute_timeout(min_timeout, max_timeout); |
332 | ||
35388783 | 333 | log_radv(ra, "Next Router Advertisement in %s", |
204fb681 PF |
334 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, |
335 | timeout, USEC_PER_SEC)); | |
336 | ||
807a8ede YW |
337 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
338 | clock_boottime_or_monotonic(), | |
339 | time_now + timeout, MSEC_PER_SEC, | |
340 | radv_timeout, ra, | |
341 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
342 | if (r < 0) |
343 | goto fail; | |
344 | ||
345 | ra->ra_sent++; | |
346 | ||
807a8ede YW |
347 | return 0; |
348 | ||
204fb681 | 349 | fail: |
290696e5 | 350 | sd_radv_stop(ra); |
204fb681 PF |
351 | |
352 | return 0; | |
353 | } | |
354 | ||
290696e5 | 355 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
356 | int r; |
357 | ||
c8bae363 YW |
358 | if (!ra) |
359 | return 0; | |
204f99d2 | 360 | |
6f8a8b84 SS |
361 | if (ra->state == SD_RADV_STATE_IDLE) |
362 | return 0; | |
363 | ||
35388783 | 364 | log_radv(ra, "Stopping IPv6 Router Advertisement daemon"); |
204f99d2 | 365 | |
290696e5 YW |
366 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
367 | with zero lifetime */ | |
368 | r = radv_send(ra, NULL, 0); | |
369 | if (r < 0) | |
35388783 | 370 | log_radv_errno(ra, r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); |
204fb681 PF |
371 | |
372 | radv_reset(ra); | |
77baf5ae | 373 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
374 | ra->state = SD_RADV_STATE_IDLE; |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | _public_ int sd_radv_start(sd_radv *ra) { | |
f474884c | 380 | int r; |
204fb681 | 381 | |
204f99d2 PF |
382 | assert_return(ra, -EINVAL); |
383 | assert_return(ra->event, -EINVAL); | |
384 | assert_return(ra->ifindex > 0, -EINVAL); | |
385 | ||
386 | if (ra->state != SD_RADV_STATE_IDLE) | |
387 | return 0; | |
388 | ||
807a8ede YW |
389 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
390 | clock_boottime_or_monotonic(), | |
391 | 0, 0, | |
392 | radv_timeout, ra, | |
393 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
394 | if (r < 0) |
395 | goto fail; | |
396 | ||
77baf5ae PF |
397 | r = icmp6_bind_router_advertisement(ra->ifindex); |
398 | if (r < 0) | |
399 | goto fail; | |
400 | ||
401 | ra->fd = r; | |
88d5a3db PF |
402 | |
403 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
404 | if (r < 0) | |
405 | goto fail; | |
406 | ||
407 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
408 | if (r < 0) | |
409 | goto fail; | |
410 | ||
411 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 412 | |
204f99d2 PF |
413 | ra->state = SD_RADV_STATE_ADVERTISING; |
414 | ||
35388783 | 415 | log_radv(ra, "Started IPv6 Router Advertisement daemon"); |
204f99d2 PF |
416 | |
417 | return 0; | |
204fb681 PF |
418 | |
419 | fail: | |
420 | radv_reset(ra); | |
421 | ||
422 | return r; | |
204f99d2 PF |
423 | } |
424 | ||
425 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
426 | assert_return(ra, -EINVAL); | |
7fa69c0a | 427 | assert_return(ifindex > 0, -EINVAL); |
204f99d2 PF |
428 | |
429 | if (ra->state != SD_RADV_STATE_IDLE) | |
430 | return -EBUSY; | |
431 | ||
432 | ra->ifindex = ifindex; | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
61a9fa8f YW |
437 | int sd_radv_set_ifname(sd_radv *ra, const char *ifname) { |
438 | assert_return(ra, -EINVAL); | |
439 | assert_return(ifname, -EINVAL); | |
440 | ||
441 | if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) | |
442 | return -EINVAL; | |
443 | ||
444 | return free_and_strdup(&ra->ifname, ifname); | |
445 | } | |
446 | ||
447 | const char *sd_radv_get_ifname(sd_radv *ra) { | |
448 | if (!ra) | |
449 | return NULL; | |
450 | ||
451 | return get_ifname(ra->ifindex, &ra->ifname); | |
452 | } | |
453 | ||
204f99d2 PF |
454 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { |
455 | assert_return(ra, -EINVAL); | |
456 | ||
457 | if (ra->state != SD_RADV_STATE_IDLE) | |
458 | return -EBUSY; | |
459 | ||
460 | if (mac_addr) | |
461 | ra->mac_addr = *mac_addr; | |
462 | else | |
463 | zero(ra->mac_addr); | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
469 | assert_return(ra, -EINVAL); | |
470 | assert_return(mtu >= 1280, -EINVAL); | |
471 | ||
204f99d2 PF |
472 | ra->mtu = mtu; |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
478 | assert_return(ra, -EINVAL); | |
479 | ||
480 | if (ra->state != SD_RADV_STATE_IDLE) | |
481 | return -EBUSY; | |
482 | ||
483 | ra->hop_limit = hop_limit; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
ac138551 | 488 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint16_t router_lifetime) { |
204f99d2 PF |
489 | assert_return(ra, -EINVAL); |
490 | ||
491 | if (ra->state != SD_RADV_STATE_IDLE) | |
492 | return -EBUSY; | |
493 | ||
ac138551 YW |
494 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set |
495 | * to (00) by the sender..." */ | |
204f99d2 PF |
496 | if (router_lifetime == 0 && |
497 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) | |
498 | return -ETIME; | |
499 | ||
500 | ra->lifetime = router_lifetime; | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
505 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
506 | assert_return(ra, -EINVAL); | |
507 | ||
508 | if (ra->state != SD_RADV_STATE_IDLE) | |
509 | return -EBUSY; | |
510 | ||
511 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
516 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
517 | assert_return(ra, -EINVAL); | |
518 | ||
519 | if (ra->state != SD_RADV_STATE_IDLE) | |
520 | return -EBUSY; | |
521 | ||
522 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
204f99d2 PF |
528 | assert_return(ra, -EINVAL); |
529 | assert_return(IN_SET(preference, | |
530 | SD_NDISC_PREFERENCE_LOW, | |
531 | SD_NDISC_PREFERENCE_MEDIUM, | |
532 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
533 | ||
dd1b1870 YW |
534 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set |
535 | * to (00) by the sender..." */ | |
536 | if (ra->lifetime == 0 && preference != SD_NDISC_PREFERENCE_MEDIUM) | |
537 | return -EINVAL; | |
538 | ||
204f99d2 PF |
539 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); |
540 | ||
dd1b1870 | 541 | return 0; |
204f99d2 PF |
542 | } |
543 | ||
a3a98776 | 544 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, int dynamic) { |
204f99d2 | 545 | sd_radv_prefix *cur; |
d601b566 | 546 | int r; |
204f99d2 | 547 | _cleanup_free_ char *addr_p = NULL; |
d601b566 PF |
548 | char time_string_preferred[FORMAT_TIMESPAN_MAX]; |
549 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
550 | usec_t time_now, valid, preferred, valid_until, preferred_until; | |
204f99d2 PF |
551 | |
552 | assert_return(ra, -EINVAL); | |
553 | ||
554 | if (!p) | |
555 | return -EINVAL; | |
556 | ||
59ea6e57 | 557 | /* Refuse prefixes that don't have a prefix set */ |
94876904 | 558 | if (in6_addr_is_null(&p->opt.in6_addr)) |
59ea6e57 LP |
559 | return -ENOEXEC; |
560 | ||
5380707a | 561 | (void) in_addr_prefix_to_string(AF_INET6, |
c633628d | 562 | (const union in_addr_union*) &p->opt.in6_addr, |
5380707a YW |
563 | p->opt.prefixlen, &addr_p); |
564 | ||
204f99d2 | 565 | LIST_FOREACH(prefix, cur, ra->prefixes) { |
204f99d2 PF |
566 | |
567 | r = in_addr_prefix_intersect(AF_INET6, | |
c633628d | 568 | (const union in_addr_union*) &cur->opt.in6_addr, |
204f99d2 | 569 | cur->opt.prefixlen, |
c633628d | 570 | (const union in_addr_union*) &p->opt.in6_addr, |
204f99d2 | 571 | p->opt.prefixlen); |
5380707a YW |
572 | if (r < 0) |
573 | return r; | |
574 | if (r == 0) | |
575 | continue; | |
204f99d2 | 576 | |
5380707a YW |
577 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
578 | goto update; | |
d601b566 | 579 | |
5380707a YW |
580 | _cleanup_free_ char *addr_cur = NULL; |
581 | (void) in_addr_prefix_to_string(AF_INET6, | |
c633628d | 582 | (const union in_addr_union*) &cur->opt.in6_addr, |
5380707a | 583 | cur->opt.prefixlen, &addr_cur); |
35388783 YW |
584 | return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST), |
585 | "IPv6 prefix %s already configured, ignoring %s", | |
586 | strna(addr_cur), strna(addr_p)); | |
204f99d2 PF |
587 | } |
588 | ||
589 | p = sd_radv_prefix_ref(p); | |
590 | ||
591 | LIST_APPEND(prefix, ra->prefixes, p); | |
592 | ||
593 | ra->n_prefixes++; | |
594 | ||
d601b566 | 595 | if (!dynamic) { |
35388783 | 596 | log_radv(ra, "Added prefix %s", strna(addr_p)); |
d601b566 PF |
597 | return 0; |
598 | } | |
599 | ||
600 | cur = p; | |
601 | ||
97efde65 MM |
602 | /* If RAs have already been sent, send an RA immediately to announce the newly-added prefix */ |
603 | if (ra->ra_sent > 0) { | |
6333aa9d LP |
604 | r = radv_send(ra, NULL, ra->lifetime); |
605 | if (r < 0) | |
35388783 | 606 | log_radv_errno(ra, r, "Unable to send Router Advertisement for added prefix: %m"); |
6333aa9d | 607 | else |
35388783 | 608 | log_radv(ra, "Sent Router Advertisement for added prefix"); |
97efde65 MM |
609 | } |
610 | ||
d601b566 PF |
611 | update: |
612 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
613 | if (r < 0) | |
614 | return r; | |
615 | ||
616 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
617 | valid_until = usec_add(valid, time_now); | |
618 | if (valid_until == USEC_INFINITY) | |
619 | return -EOVERFLOW; | |
620 | ||
621 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
622 | preferred_until = usec_add(preferred, time_now); | |
623 | if (preferred_until == USEC_INFINITY) | |
624 | return -EOVERFLOW; | |
625 | ||
626 | cur->valid_until = valid_until; | |
627 | cur->preferred_until = preferred_until; | |
628 | ||
35388783 | 629 | log_radv(ra, "Updated prefix %s preferred %s valid %s", |
5380707a | 630 | strna(addr_p), |
d601b566 PF |
631 | format_timespan(time_string_preferred, FORMAT_TIMESPAN_MAX, |
632 | preferred, USEC_PER_SEC), | |
633 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, | |
634 | valid, USEC_PER_SEC)); | |
204f99d2 PF |
635 | |
636 | return 0; | |
637 | } | |
638 | ||
34c169c4 | 639 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
640 | const struct in6_addr *prefix, |
641 | unsigned char prefixlen) { | |
34c169c4 PF |
642 | sd_radv_prefix *cur, *next; |
643 | ||
644 | assert_return(ra, NULL); | |
645 | assert_return(prefix, NULL); | |
646 | ||
647 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
648 | if (prefixlen != cur->opt.prefixlen) | |
649 | continue; | |
650 | ||
94876904 | 651 | if (!in6_addr_equal(prefix, &cur->opt.in6_addr)) |
34c169c4 PF |
652 | continue; |
653 | ||
654 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
655 | ra->n_prefixes--; | |
62bbbedf | 656 | sd_radv_prefix_unref(cur); |
34c169c4 PF |
657 | |
658 | break; | |
659 | } | |
660 | ||
661 | return cur; | |
662 | } | |
663 | ||
203d4df5 SS |
664 | _public_ int sd_radv_add_route_prefix(sd_radv *ra, sd_radv_route_prefix *p, int dynamic) { |
665 | char time_string_valid[FORMAT_TIMESPAN_MAX]; | |
666 | usec_t time_now, valid, valid_until; | |
667 | _cleanup_free_ char *pretty = NULL; | |
668 | sd_radv_route_prefix *cur; | |
669 | int r; | |
670 | ||
671 | assert_return(ra, -EINVAL); | |
672 | ||
673 | if (!p) | |
674 | return -EINVAL; | |
675 | ||
5380707a | 676 | (void) in_addr_prefix_to_string(AF_INET6, |
c633628d | 677 | (const union in_addr_union*) &p->opt.in6_addr, |
5380707a | 678 | p->opt.prefixlen, &pretty); |
203d4df5 SS |
679 | |
680 | LIST_FOREACH(prefix, cur, ra->route_prefixes) { | |
203d4df5 SS |
681 | |
682 | r = in_addr_prefix_intersect(AF_INET6, | |
c633628d | 683 | (const union in_addr_union*) &cur->opt.in6_addr, |
203d4df5 | 684 | cur->opt.prefixlen, |
c633628d | 685 | (const union in_addr_union*) &p->opt.in6_addr, |
203d4df5 SS |
686 | p->opt.prefixlen); |
687 | if (r < 0) | |
688 | return r; | |
689 | if (r == 0) | |
690 | continue; | |
691 | ||
692 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) | |
693 | goto update; | |
694 | ||
5380707a YW |
695 | _cleanup_free_ char *addr = NULL; |
696 | (void) in_addr_prefix_to_string(AF_INET6, | |
c633628d | 697 | (const union in_addr_union*) &cur->opt.in6_addr, |
5380707a | 698 | cur->opt.prefixlen, &addr); |
35388783 YW |
699 | return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST), |
700 | "IPv6 route prefix %s already configured, ignoring %s", | |
701 | strna(addr), strna(pretty)); | |
203d4df5 SS |
702 | } |
703 | ||
704 | p = sd_radv_route_prefix_ref(p); | |
705 | ||
706 | LIST_APPEND(prefix, ra->route_prefixes, p); | |
707 | ra->n_route_prefixes++; | |
708 | ||
203d4df5 | 709 | if (!dynamic) { |
35388783 | 710 | log_radv(ra, "Added prefix %s", strna(pretty)); |
203d4df5 SS |
711 | return 0; |
712 | } | |
713 | ||
97efde65 MM |
714 | /* If RAs have already been sent, send an RA immediately to announce the newly-added route prefix */ |
715 | if (ra->ra_sent > 0) { | |
6333aa9d LP |
716 | r = radv_send(ra, NULL, ra->lifetime); |
717 | if (r < 0) | |
35388783 | 718 | log_radv_errno(ra, r, "Unable to send Router Advertisement for added route prefix: %m"); |
6333aa9d | 719 | else |
35388783 | 720 | log_radv(ra, "Sent Router Advertisement for added route prefix"); |
97efde65 MM |
721 | } |
722 | ||
203d4df5 SS |
723 | update: |
724 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
725 | if (r < 0) | |
726 | return r; | |
727 | ||
728 | valid = be32toh(p->opt.lifetime) * USEC_PER_SEC; | |
729 | valid_until = usec_add(valid, time_now); | |
730 | if (valid_until == USEC_INFINITY) | |
731 | return -EOVERFLOW; | |
732 | ||
35388783 | 733 | log_radv(ra, "Updated route prefix %s valid %s", |
5380707a | 734 | strna(pretty), |
203d4df5 SS |
735 | format_timespan(time_string_valid, FORMAT_TIMESPAN_MAX, valid, USEC_PER_SEC)); |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
e9c6da38 PF |
740 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
741 | const struct in6_addr *dns, size_t n_dns) { | |
742 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
743 | size_t len; | |
744 | ||
745 | assert_return(ra, -EINVAL); | |
746 | assert_return(n_dns < 128, -EINVAL); | |
747 | ||
748 | if (!dns || n_dns == 0) { | |
749 | ra->rdnss = mfree(ra->rdnss); | |
750 | ra->n_rdnss = 0; | |
751 | ||
752 | return 0; | |
753 | } | |
754 | ||
755 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
756 | ||
757 | opt_rdnss = malloc0(len); | |
758 | if (!opt_rdnss) | |
759 | return -ENOMEM; | |
760 | ||
761 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
762 | opt_rdnss->length = len / 8; | |
763 | opt_rdnss->lifetime = htobe32(lifetime); | |
764 | ||
765 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
766 | ||
1cc6c93a | 767 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
768 | |
769 | ra->n_rdnss = n_dns; | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
e965d6ab PF |
774 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
775 | char **search_list) { | |
776 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
777 | size_t len = 0; | |
778 | char **s; | |
779 | uint8_t *p; | |
780 | ||
781 | assert_return(ra, -EINVAL); | |
782 | ||
97d7974b | 783 | if (strv_isempty(search_list)) { |
e965d6ab | 784 | ra->dnssl = mfree(ra->dnssl); |
e965d6ab PF |
785 | return 0; |
786 | } | |
787 | ||
788 | STRV_FOREACH(s, search_list) | |
789 | len += strlen(*s) + 2; | |
790 | ||
791 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
792 | ||
793 | opt_dnssl = malloc0(len); | |
794 | if (!opt_dnssl) | |
795 | return -ENOMEM; | |
796 | ||
797 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
798 | opt_dnssl->length = len / 8; | |
799 | opt_dnssl->lifetime = htobe32(lifetime); | |
800 | ||
801 | p = (uint8_t *)(opt_dnssl + 1); | |
802 | len -= sizeof(struct sd_radv_opt_dns); | |
803 | ||
804 | STRV_FOREACH(s, search_list) { | |
805 | int r; | |
806 | ||
807 | r = dns_name_to_wire_format(*s, p, len, false); | |
808 | if (r < 0) | |
809 | return r; | |
810 | ||
811 | if (len < (size_t)r) | |
812 | return -ENOBUFS; | |
813 | ||
814 | p += r; | |
815 | len -= r; | |
816 | } | |
817 | ||
1cc6c93a | 818 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
819 | |
820 | return 0; | |
821 | } | |
822 | ||
04473969 | 823 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
d2c8eed2 | 824 | sd_radv_prefix *p; |
04473969 PF |
825 | |
826 | assert_return(ret, -EINVAL); | |
827 | ||
d2c8eed2 | 828 | p = new(sd_radv_prefix, 1); |
04473969 PF |
829 | if (!p) |
830 | return -ENOMEM; | |
831 | ||
d2c8eed2 LP |
832 | *p = (sd_radv_prefix) { |
833 | .n_ref = 1, | |
04473969 | 834 | |
d2c8eed2 LP |
835 | .opt.type = ND_OPT_PREFIX_INFORMATION, |
836 | .opt.length = (sizeof(p->opt) - 1)/8 + 1, | |
837 | .opt.prefixlen = 64, | |
04473969 | 838 | |
d2c8eed2 LP |
839 | /* RFC 4861, Section 6.2.1 */ |
840 | .opt.flags = ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO, | |
204f99d2 | 841 | |
d2c8eed2 LP |
842 | .opt.preferred_lifetime = htobe32(604800), |
843 | .opt.valid_lifetime = htobe32(2592000), | |
844 | }; | |
04473969 | 845 | |
d2c8eed2 | 846 | *ret = p; |
04473969 PF |
847 | return 0; |
848 | } | |
849 | ||
8301aa0b | 850 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree); |
04473969 | 851 | |
f5a5706a | 852 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
853 | unsigned char prefixlen) { |
854 | assert_return(p, -EINVAL); | |
855 | assert_return(in6_addr, -EINVAL); | |
856 | ||
857 | if (prefixlen < 3 || prefixlen > 128) | |
858 | return -EINVAL; | |
859 | ||
860 | if (prefixlen > 64) | |
861 | /* unusual but allowed, log it */ | |
35388783 | 862 | log_radv(NULL, "Unusual prefix length %d greater than 64", prefixlen); |
04473969 PF |
863 | |
864 | p->opt.in6_addr = *in6_addr; | |
865 | p->opt.prefixlen = prefixlen; | |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
34332af2 SS |
870 | _public_ int sd_radv_prefix_get_prefix(sd_radv_prefix *p, struct in6_addr *ret_in6_addr, |
871 | unsigned char *ret_prefixlen) { | |
872 | assert_return(p, -EINVAL); | |
873 | assert_return(ret_in6_addr, -EINVAL); | |
874 | assert_return(ret_prefixlen, -EINVAL); | |
875 | ||
876 | *ret_in6_addr = p->opt.in6_addr; | |
877 | *ret_prefixlen = p->opt.prefixlen; | |
878 | ||
879 | return 0; | |
880 | } | |
881 | ||
04473969 PF |
882 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { |
883 | assert_return(p, -EINVAL); | |
884 | ||
885 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
886 | ||
887 | return 0; | |
888 | } | |
889 | ||
890 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
891 | int address_autoconfiguration) { | |
892 | assert_return(p, -EINVAL); | |
893 | ||
894 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
900 | uint32_t valid_lifetime) { | |
901 | assert_return(p, -EINVAL); | |
902 | ||
903 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
909 | uint32_t preferred_lifetime) { | |
910 | assert_return(p, -EINVAL); | |
911 | ||
912 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
913 | ||
914 | return 0; | |
915 | } | |
203d4df5 SS |
916 | |
917 | _public_ int sd_radv_route_prefix_new(sd_radv_route_prefix **ret) { | |
918 | sd_radv_route_prefix *p; | |
919 | ||
920 | assert_return(ret, -EINVAL); | |
921 | ||
922 | p = new(sd_radv_route_prefix, 1); | |
923 | if (!p) | |
924 | return -ENOMEM; | |
925 | ||
926 | *p = (sd_radv_route_prefix) { | |
927 | .n_ref = 1, | |
928 | ||
929 | .opt.type = SD_RADV_OPT_ROUTE_INFORMATION, | |
930 | .opt.length = DIV_ROUND_UP(sizeof(p->opt), 8), | |
931 | .opt.prefixlen = 64, | |
932 | ||
933 | .opt.lifetime = htobe32(604800), | |
934 | }; | |
935 | ||
936 | *ret = p; | |
937 | return 0; | |
938 | } | |
939 | ||
940 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_route_prefix, sd_radv_route_prefix, mfree); | |
941 | ||
942 | _public_ int sd_radv_prefix_set_route_prefix(sd_radv_route_prefix *p, const struct in6_addr *in6_addr, | |
943 | unsigned char prefixlen) { | |
944 | assert_return(p, -EINVAL); | |
945 | assert_return(in6_addr, -EINVAL); | |
946 | ||
947 | if (prefixlen > 128) | |
948 | return -EINVAL; | |
949 | ||
950 | if (prefixlen > 64) | |
951 | /* unusual but allowed, log it */ | |
35388783 | 952 | log_radv(NULL, "Unusual prefix length %u greater than 64", prefixlen); |
203d4df5 SS |
953 | |
954 | p->opt.in6_addr = *in6_addr; | |
955 | p->opt.prefixlen = prefixlen; | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | _public_ int sd_radv_route_prefix_set_lifetime(sd_radv_route_prefix *p, uint32_t valid_lifetime) { | |
961 | assert_return(p, -EINVAL); | |
962 | ||
963 | p->opt.lifetime = htobe32(valid_lifetime); | |
964 | ||
965 | return 0; | |
966 | } |