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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 | |
eb2f7502 | 92 | ra->recv_event_source = sd_event_source_disable_unref(ra->recv_event_source); |
88d5a3db | 93 | |
204fb681 PF |
94 | ra->ra_sent = 0; |
95 | } | |
96 | ||
8301aa0b | 97 | static sd_radv *radv_free(sd_radv *ra) { |
e866e17b LP |
98 | if (!ra) |
99 | return NULL; | |
204f99d2 PF |
100 | |
101 | while (ra->prefixes) { | |
102 | sd_radv_prefix *p = ra->prefixes; | |
103 | ||
104 | LIST_REMOVE(prefix, ra->prefixes, p); | |
105 | sd_radv_prefix_unref(p); | |
106 | } | |
107 | ||
69d7eba1 YW |
108 | while (ra->route_prefixes) { |
109 | sd_radv_route_prefix *p = ra->route_prefixes; | |
110 | ||
111 | LIST_REMOVE(prefix, ra->route_prefixes, p); | |
112 | sd_radv_route_prefix_unref(p); | |
113 | } | |
114 | ||
e9c6da38 | 115 | free(ra->rdnss); |
f9aa5417 | 116 | free(ra->dnssl); |
e9c6da38 | 117 | |
204fb681 PF |
118 | radv_reset(ra); |
119 | ||
eb2f7502 | 120 | sd_event_source_unref(ra->timeout_event_source); |
204f99d2 | 121 | sd_radv_detach_event(ra); |
c4b6dda0 LP |
122 | |
123 | ra->fd = safe_close(ra->fd); | |
61a9fa8f | 124 | free(ra->ifname); |
c4b6dda0 | 125 | |
204f99d2 PF |
126 | return mfree(ra); |
127 | } | |
128 | ||
8301aa0b YW |
129 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv, sd_radv, radv_free); |
130 | ||
7003b114 | 131 | static int radv_send(sd_radv *ra, const struct in6_addr *dst, usec_t lifetime_usec) { |
203d4df5 | 132 | sd_radv_route_prefix *rt; |
77baf5ae PF |
133 | sd_radv_prefix *p; |
134 | struct sockaddr_in6 dst_addr = { | |
135 | .sin6_family = AF_INET6, | |
136 | .sin6_addr = IN6ADDR_ALL_NODES_MULTICAST_INIT, | |
137 | }; | |
138 | struct nd_router_advert adv = {}; | |
139 | struct { | |
140 | struct nd_opt_hdr opthdr; | |
141 | struct ether_addr slladdr; | |
142 | } _packed_ opt_mac = { | |
143 | .opthdr = { | |
144 | .nd_opt_type = ND_OPT_SOURCE_LINKADDR, | |
145 | .nd_opt_len = (sizeof(struct nd_opt_hdr) + | |
146 | sizeof(struct ether_addr) - 1) /8 + 1, | |
147 | }, | |
148 | }; | |
149 | struct nd_opt_mtu opt_mtu = { | |
150 | .nd_opt_mtu_type = ND_OPT_MTU, | |
151 | .nd_opt_mtu_len = 1, | |
152 | }; | |
203d4df5 | 153 | /* Reserve iov space for RA header, linkaddr, MTU, N prefixes, N routes, RDNSS |
6852c0f6 | 154 | and DNSSL */ |
203d4df5 | 155 | struct iovec iov[5 + ra->n_prefixes + ra->n_route_prefixes]; |
77baf5ae PF |
156 | struct msghdr msg = { |
157 | .msg_name = &dst_addr, | |
158 | .msg_namelen = sizeof(dst_addr), | |
159 | .msg_iov = iov, | |
160 | }; | |
7003b114 | 161 | uint16_t lifetime_sec; |
d601b566 PF |
162 | usec_t time_now; |
163 | int r; | |
164 | ||
dc0ec5e2 LP |
165 | assert(ra); |
166 | ||
d601b566 PF |
167 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
168 | if (r < 0) | |
169 | return r; | |
77baf5ae | 170 | |
7003b114 YW |
171 | /* a value of UINT16_MAX represents infinity, 0x0 means this host is not a router */ |
172 | if (lifetime_usec == USEC_INFINITY) | |
173 | lifetime_sec = UINT16_MAX; | |
174 | else if (lifetime_usec > (UINT16_MAX - 1) * USEC_PER_SEC) | |
175 | lifetime_sec = UINT16_MAX - 1; | |
176 | else | |
177 | lifetime_sec = DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC); | |
178 | ||
94876904 | 179 | if (dst && in6_addr_is_set(dst)) |
77baf5ae | 180 | dst_addr.sin6_addr = *dst; |
88d5a3db | 181 | |
77baf5ae PF |
182 | adv.nd_ra_type = ND_ROUTER_ADVERT; |
183 | adv.nd_ra_curhoplimit = ra->hop_limit; | |
184 | adv.nd_ra_flags_reserved = ra->flags; | |
7003b114 | 185 | adv.nd_ra_router_lifetime = htobe16(lifetime_sec); |
5cfa2c3d | 186 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&adv, sizeof(adv)); |
77baf5ae PF |
187 | |
188 | /* MAC address is optional, either because the link does not use L2 | |
189 | addresses or load sharing is desired. See RFC 4861, Section 4.2 */ | |
ae25915d | 190 | if (!ether_addr_is_null(&ra->mac_addr)) { |
77baf5ae | 191 | opt_mac.slladdr = ra->mac_addr; |
5cfa2c3d | 192 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&opt_mac, sizeof(opt_mac)); |
77baf5ae PF |
193 | } |
194 | ||
195 | if (ra->mtu) { | |
196 | opt_mtu.nd_opt_mtu_mtu = htobe32(ra->mtu); | |
5cfa2c3d | 197 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&opt_mtu, sizeof(opt_mtu)); |
77baf5ae PF |
198 | } |
199 | ||
200 | LIST_FOREACH(prefix, p, ra->prefixes) { | |
d601b566 PF |
201 | if (p->valid_until) { |
202 | ||
203 | if (time_now > p->valid_until) | |
204 | p->opt.valid_lifetime = 0; | |
205 | else | |
206 | p->opt.valid_lifetime = htobe32((p->valid_until - time_now) / USEC_PER_SEC); | |
207 | ||
208 | if (time_now > p->preferred_until) | |
209 | p->opt.preferred_lifetime = 0; | |
210 | else | |
211 | p->opt.preferred_lifetime = htobe32((p->preferred_until - time_now) / USEC_PER_SEC); | |
212 | } | |
5cfa2c3d | 213 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&p->opt, sizeof(p->opt)); |
77baf5ae PF |
214 | } |
215 | ||
203d4df5 SS |
216 | LIST_FOREACH(prefix, rt, ra->route_prefixes) |
217 | iov[msg.msg_iovlen++] = IOVEC_MAKE(&rt->opt, sizeof(rt->opt)); | |
218 | ||
5cfa2c3d LP |
219 | if (ra->rdnss) |
220 | iov[msg.msg_iovlen++] = IOVEC_MAKE(ra->rdnss, ra->rdnss->length * 8); | |
e9c6da38 | 221 | |
5cfa2c3d LP |
222 | if (ra->dnssl) |
223 | iov[msg.msg_iovlen++] = IOVEC_MAKE(ra->dnssl, ra->dnssl->length * 8); | |
e965d6ab | 224 | |
77baf5ae PF |
225 | if (sendmsg(ra->fd, &msg, 0) < 0) |
226 | return -errno; | |
204fb681 | 227 | |
77baf5ae | 228 | return 0; |
204fb681 PF |
229 | } |
230 | ||
88d5a3db PF |
231 | static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
232 | sd_radv *ra = userdata; | |
233 | _cleanup_free_ char *addr = NULL; | |
234 | struct in6_addr src; | |
235 | triple_timestamp timestamp; | |
236 | int r; | |
237 | ssize_t buflen; | |
238 | _cleanup_free_ char *buf = NULL; | |
239 | ||
240 | assert(s); | |
241 | assert(ra); | |
242 | assert(ra->event); | |
243 | ||
244 | buflen = next_datagram_size_fd(fd); | |
cfffddea LP |
245 | if (buflen < 0) |
246 | return (int) buflen; | |
88d5a3db PF |
247 | |
248 | buf = new0(char, buflen); | |
249 | if (!buf) | |
e55a6eae | 250 | return -ENOMEM; |
88d5a3db PF |
251 | |
252 | r = icmp6_receive(fd, buf, buflen, &src, ×tamp); | |
253 | if (r < 0) { | |
254 | switch (r) { | |
255 | case -EADDRNOTAVAIL: | |
c633628d | 256 | (void) in_addr_to_string(AF_INET6, (const union in_addr_union*) &src, &addr); |
35388783 | 257 | log_radv(ra, "Received RS from non-link-local address %s. Ignoring", addr); |
88d5a3db PF |
258 | break; |
259 | ||
260 | case -EMULTIHOP: | |
35388783 | 261 | log_radv(ra, "Received RS with invalid hop limit. Ignoring."); |
88d5a3db PF |
262 | break; |
263 | ||
264 | case -EPFNOSUPPORT: | |
35388783 | 265 | log_radv(ra, "Received invalid source address from ICMPv6 socket. Ignoring."); |
88d5a3db PF |
266 | break; |
267 | ||
8eb41f4c LP |
268 | case -EAGAIN: /* ignore spurious wakeups */ |
269 | break; | |
270 | ||
88d5a3db | 271 | default: |
35388783 | 272 | log_radv_errno(ra, r, "Unexpected error receiving from ICMPv6 socket, Ignoring: %m"); |
88d5a3db PF |
273 | break; |
274 | } | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
cfffddea | 279 | if ((size_t) buflen < sizeof(struct nd_router_solicit)) { |
35388783 | 280 | log_radv(ra, "Too short packet received, ignoring"); |
cfffddea LP |
281 | return 0; |
282 | } | |
283 | ||
c633628d | 284 | (void) in_addr_to_string(AF_INET6, (const union in_addr_union*) &src, &addr); |
88d5a3db | 285 | |
7003b114 | 286 | r = radv_send(ra, &src, ra->lifetime_usec); |
88d5a3db | 287 | if (r < 0) |
35388783 | 288 | log_radv_errno(ra, r, "Unable to send solicited Router Advertisement to %s, ignoring: %m", strnull(addr)); |
88d5a3db | 289 | else |
35388783 | 290 | log_radv(ra, "Sent solicited Router Advertisement to %s", strnull(addr)); |
88d5a3db PF |
291 | |
292 | return 0; | |
293 | } | |
294 | ||
204fb681 PF |
295 | static usec_t radv_compute_timeout(usec_t min, usec_t max) { |
296 | assert_return(min <= max, SD_RADV_DEFAULT_MIN_TIMEOUT_USEC); | |
297 | ||
ef90b6a4 GM |
298 | /* RFC 4861: min must be no less than 3s, max must be no less than 4s */ |
299 | min = MAX(min, 3*USEC_PER_SEC); | |
300 | max = MAX(max, 4*USEC_PER_SEC); | |
301 | ||
204fb681 PF |
302 | return min + (random_u32() % (max - min)); |
303 | } | |
304 | ||
305 | static int radv_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
7003b114 | 306 | usec_t min_timeout, max_timeout, time_now, timeout; |
204fb681 | 307 | sd_radv *ra = userdata; |
7003b114 | 308 | int r; |
204fb681 PF |
309 | |
310 | assert(s); | |
311 | assert(ra); | |
312 | assert(ra->event); | |
313 | ||
204fb681 PF |
314 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); |
315 | if (r < 0) | |
316 | goto fail; | |
317 | ||
7003b114 | 318 | r = radv_send(ra, NULL, ra->lifetime_usec); |
204fb681 | 319 | if (r < 0) |
35388783 | 320 | log_radv_errno(ra, r, "Unable to send Router Advertisement: %m"); |
204fb681 PF |
321 | |
322 | /* RFC 4861, Section 6.2.4, sending initial Router Advertisements */ | |
323 | if (ra->ra_sent < SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS) { | |
324 | max_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC; | |
325 | min_timeout = SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC / 3; | |
7003b114 YW |
326 | } else { |
327 | max_timeout = SD_RADV_DEFAULT_MAX_TIMEOUT_USEC; | |
328 | min_timeout = SD_RADV_DEFAULT_MIN_TIMEOUT_USEC; | |
204fb681 PF |
329 | } |
330 | ||
ef90b6a4 GM |
331 | /* RFC 4861, Section 6.2.1, lifetime must be at least MaxRtrAdvInterval, |
332 | so lower the interval here */ | |
7003b114 YW |
333 | if (ra->lifetime_usec > 0 && ra->lifetime_usec < max_timeout) { |
334 | max_timeout = ra->lifetime_usec; | |
ef90b6a4 GM |
335 | min_timeout = max_timeout / 3; |
336 | } | |
337 | ||
204fb681 | 338 | timeout = radv_compute_timeout(min_timeout, max_timeout); |
5291f26d | 339 | log_radv(ra, "Next Router Advertisement in %s", FORMAT_TIMESPAN(timeout, USEC_PER_SEC)); |
204fb681 | 340 | |
807a8ede YW |
341 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
342 | clock_boottime_or_monotonic(), | |
343 | time_now + timeout, MSEC_PER_SEC, | |
344 | radv_timeout, ra, | |
345 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
346 | if (r < 0) |
347 | goto fail; | |
348 | ||
349 | ra->ra_sent++; | |
350 | ||
807a8ede YW |
351 | return 0; |
352 | ||
204fb681 | 353 | fail: |
290696e5 | 354 | sd_radv_stop(ra); |
204fb681 PF |
355 | |
356 | return 0; | |
357 | } | |
358 | ||
290696e5 | 359 | _public_ int sd_radv_stop(sd_radv *ra) { |
204fb681 PF |
360 | int r; |
361 | ||
c8bae363 YW |
362 | if (!ra) |
363 | return 0; | |
204f99d2 | 364 | |
6f8a8b84 SS |
365 | if (ra->state == SD_RADV_STATE_IDLE) |
366 | return 0; | |
367 | ||
35388783 | 368 | log_radv(ra, "Stopping IPv6 Router Advertisement daemon"); |
204f99d2 | 369 | |
290696e5 YW |
370 | /* RFC 4861, Section 6.2.5, send at least one Router Advertisement |
371 | with zero lifetime */ | |
372 | r = radv_send(ra, NULL, 0); | |
373 | if (r < 0) | |
35388783 | 374 | log_radv_errno(ra, r, "Unable to send last Router Advertisement with router lifetime set to zero: %m"); |
204fb681 PF |
375 | |
376 | radv_reset(ra); | |
77baf5ae | 377 | ra->fd = safe_close(ra->fd); |
204f99d2 PF |
378 | ra->state = SD_RADV_STATE_IDLE; |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | _public_ int sd_radv_start(sd_radv *ra) { | |
f474884c | 384 | int r; |
204fb681 | 385 | |
204f99d2 PF |
386 | assert_return(ra, -EINVAL); |
387 | assert_return(ra->event, -EINVAL); | |
388 | assert_return(ra->ifindex > 0, -EINVAL); | |
389 | ||
390 | if (ra->state != SD_RADV_STATE_IDLE) | |
391 | return 0; | |
392 | ||
807a8ede YW |
393 | r = event_reset_time(ra->event, &ra->timeout_event_source, |
394 | clock_boottime_or_monotonic(), | |
395 | 0, 0, | |
396 | radv_timeout, ra, | |
397 | ra->event_priority, "radv-timeout", true); | |
204fb681 PF |
398 | if (r < 0) |
399 | goto fail; | |
400 | ||
77baf5ae PF |
401 | r = icmp6_bind_router_advertisement(ra->ifindex); |
402 | if (r < 0) | |
403 | goto fail; | |
404 | ||
405 | ra->fd = r; | |
88d5a3db PF |
406 | |
407 | r = sd_event_add_io(ra->event, &ra->recv_event_source, ra->fd, EPOLLIN, radv_recv, ra); | |
408 | if (r < 0) | |
409 | goto fail; | |
410 | ||
411 | r = sd_event_source_set_priority(ra->recv_event_source, ra->event_priority); | |
412 | if (r < 0) | |
413 | goto fail; | |
414 | ||
415 | (void) sd_event_source_set_description(ra->recv_event_source, "radv-receive-message"); | |
77baf5ae | 416 | |
204f99d2 PF |
417 | ra->state = SD_RADV_STATE_ADVERTISING; |
418 | ||
35388783 | 419 | log_radv(ra, "Started IPv6 Router Advertisement daemon"); |
204f99d2 PF |
420 | |
421 | return 0; | |
204fb681 PF |
422 | |
423 | fail: | |
424 | radv_reset(ra); | |
425 | ||
426 | return r; | |
204f99d2 PF |
427 | } |
428 | ||
429 | _public_ int sd_radv_set_ifindex(sd_radv *ra, int ifindex) { | |
430 | assert_return(ra, -EINVAL); | |
7fa69c0a | 431 | assert_return(ifindex > 0, -EINVAL); |
204f99d2 PF |
432 | |
433 | if (ra->state != SD_RADV_STATE_IDLE) | |
434 | return -EBUSY; | |
435 | ||
436 | ra->ifindex = ifindex; | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
61a9fa8f YW |
441 | int sd_radv_set_ifname(sd_radv *ra, const char *ifname) { |
442 | assert_return(ra, -EINVAL); | |
443 | assert_return(ifname, -EINVAL); | |
444 | ||
445 | if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) | |
446 | return -EINVAL; | |
447 | ||
448 | return free_and_strdup(&ra->ifname, ifname); | |
449 | } | |
450 | ||
5977b71f YW |
451 | int sd_radv_get_ifname(sd_radv *ra, const char **ret) { |
452 | int r; | |
453 | ||
454 | assert_return(ra, -EINVAL); | |
61a9fa8f | 455 | |
5977b71f YW |
456 | r = get_ifname(ra->ifindex, &ra->ifname); |
457 | if (r < 0) | |
458 | return r; | |
459 | ||
460 | if (ret) | |
461 | *ret = ra->ifname; | |
462 | ||
463 | return 0; | |
61a9fa8f YW |
464 | } |
465 | ||
204f99d2 PF |
466 | _public_ int sd_radv_set_mac(sd_radv *ra, const struct ether_addr *mac_addr) { |
467 | assert_return(ra, -EINVAL); | |
468 | ||
469 | if (ra->state != SD_RADV_STATE_IDLE) | |
470 | return -EBUSY; | |
471 | ||
472 | if (mac_addr) | |
473 | ra->mac_addr = *mac_addr; | |
474 | else | |
475 | zero(ra->mac_addr); | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | _public_ int sd_radv_set_mtu(sd_radv *ra, uint32_t mtu) { | |
481 | assert_return(ra, -EINVAL); | |
482 | assert_return(mtu >= 1280, -EINVAL); | |
483 | ||
204f99d2 PF |
484 | ra->mtu = mtu; |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | _public_ int sd_radv_set_hop_limit(sd_radv *ra, uint8_t hop_limit) { | |
490 | assert_return(ra, -EINVAL); | |
491 | ||
492 | if (ra->state != SD_RADV_STATE_IDLE) | |
493 | return -EBUSY; | |
494 | ||
495 | ra->hop_limit = hop_limit; | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
7003b114 | 500 | _public_ int sd_radv_set_router_lifetime(sd_radv *ra, uint64_t lifetime_usec) { |
204f99d2 PF |
501 | assert_return(ra, -EINVAL); |
502 | ||
503 | if (ra->state != SD_RADV_STATE_IDLE) | |
504 | return -EBUSY; | |
505 | ||
ac138551 YW |
506 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set |
507 | * to (00) by the sender..." */ | |
7003b114 | 508 | if (lifetime_usec == 0 && |
204f99d2 PF |
509 | (ra->flags & (0x3 << 3)) != (SD_NDISC_PREFERENCE_MEDIUM << 3)) |
510 | return -ETIME; | |
511 | ||
7003b114 | 512 | ra->lifetime_usec = lifetime_usec; |
204f99d2 PF |
513 | |
514 | return 0; | |
515 | } | |
516 | ||
517 | _public_ int sd_radv_set_managed_information(sd_radv *ra, int managed) { | |
518 | assert_return(ra, -EINVAL); | |
519 | ||
520 | if (ra->state != SD_RADV_STATE_IDLE) | |
521 | return -EBUSY; | |
522 | ||
523 | SET_FLAG(ra->flags, ND_RA_FLAG_MANAGED, managed); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | _public_ int sd_radv_set_other_information(sd_radv *ra, int other) { | |
529 | assert_return(ra, -EINVAL); | |
530 | ||
531 | if (ra->state != SD_RADV_STATE_IDLE) | |
532 | return -EBUSY; | |
533 | ||
534 | SET_FLAG(ra->flags, ND_RA_FLAG_OTHER, other); | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | _public_ int sd_radv_set_preference(sd_radv *ra, unsigned preference) { | |
204f99d2 PF |
540 | assert_return(ra, -EINVAL); |
541 | assert_return(IN_SET(preference, | |
542 | SD_NDISC_PREFERENCE_LOW, | |
543 | SD_NDISC_PREFERENCE_MEDIUM, | |
544 | SD_NDISC_PREFERENCE_HIGH), -EINVAL); | |
545 | ||
dd1b1870 YW |
546 | /* RFC 4191, Section 2.2, "...If the Router Lifetime is zero, the preference value MUST be set |
547 | * to (00) by the sender..." */ | |
7003b114 | 548 | if (ra->lifetime_usec == 0 && preference != SD_NDISC_PREFERENCE_MEDIUM) |
dd1b1870 YW |
549 | return -EINVAL; |
550 | ||
204f99d2 PF |
551 | ra->flags = (ra->flags & ~(0x3 << 3)) | (preference << 3); |
552 | ||
dd1b1870 | 553 | return 0; |
204f99d2 PF |
554 | } |
555 | ||
a3a98776 | 556 | _public_ int sd_radv_add_prefix(sd_radv *ra, sd_radv_prefix *p, int dynamic) { |
204f99d2 | 557 | sd_radv_prefix *cur; |
d601b566 | 558 | int r; |
204f99d2 | 559 | _cleanup_free_ char *addr_p = NULL; |
d601b566 | 560 | usec_t time_now, valid, preferred, valid_until, preferred_until; |
204f99d2 PF |
561 | |
562 | assert_return(ra, -EINVAL); | |
563 | ||
564 | if (!p) | |
565 | return -EINVAL; | |
566 | ||
59ea6e57 | 567 | /* Refuse prefixes that don't have a prefix set */ |
94876904 | 568 | if (in6_addr_is_null(&p->opt.in6_addr)) |
59ea6e57 LP |
569 | return -ENOEXEC; |
570 | ||
5380707a | 571 | (void) in_addr_prefix_to_string(AF_INET6, |
c633628d | 572 | (const union in_addr_union*) &p->opt.in6_addr, |
5380707a YW |
573 | p->opt.prefixlen, &addr_p); |
574 | ||
204f99d2 | 575 | LIST_FOREACH(prefix, cur, ra->prefixes) { |
204f99d2 PF |
576 | |
577 | r = in_addr_prefix_intersect(AF_INET6, | |
c633628d | 578 | (const union in_addr_union*) &cur->opt.in6_addr, |
204f99d2 | 579 | cur->opt.prefixlen, |
c633628d | 580 | (const union in_addr_union*) &p->opt.in6_addr, |
204f99d2 | 581 | p->opt.prefixlen); |
5380707a YW |
582 | if (r < 0) |
583 | return r; | |
584 | if (r == 0) | |
585 | continue; | |
204f99d2 | 586 | |
5380707a YW |
587 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) |
588 | goto update; | |
d601b566 | 589 | |
5380707a YW |
590 | _cleanup_free_ char *addr_cur = NULL; |
591 | (void) in_addr_prefix_to_string(AF_INET6, | |
c633628d | 592 | (const union in_addr_union*) &cur->opt.in6_addr, |
5380707a | 593 | cur->opt.prefixlen, &addr_cur); |
35388783 YW |
594 | return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST), |
595 | "IPv6 prefix %s already configured, ignoring %s", | |
596 | strna(addr_cur), strna(addr_p)); | |
204f99d2 PF |
597 | } |
598 | ||
599 | p = sd_radv_prefix_ref(p); | |
600 | ||
601 | LIST_APPEND(prefix, ra->prefixes, p); | |
602 | ||
603 | ra->n_prefixes++; | |
604 | ||
d601b566 | 605 | if (!dynamic) { |
35388783 | 606 | log_radv(ra, "Added prefix %s", strna(addr_p)); |
d601b566 PF |
607 | return 0; |
608 | } | |
609 | ||
610 | cur = p; | |
611 | ||
97efde65 MM |
612 | /* If RAs have already been sent, send an RA immediately to announce the newly-added prefix */ |
613 | if (ra->ra_sent > 0) { | |
7003b114 | 614 | r = radv_send(ra, NULL, ra->lifetime_usec); |
6333aa9d | 615 | if (r < 0) |
35388783 | 616 | log_radv_errno(ra, r, "Unable to send Router Advertisement for added prefix: %m"); |
6333aa9d | 617 | else |
35388783 | 618 | log_radv(ra, "Sent Router Advertisement for added prefix"); |
97efde65 MM |
619 | } |
620 | ||
d601b566 PF |
621 | update: |
622 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
623 | if (r < 0) | |
624 | return r; | |
625 | ||
626 | valid = be32toh(p->opt.valid_lifetime) * USEC_PER_SEC; | |
627 | valid_until = usec_add(valid, time_now); | |
628 | if (valid_until == USEC_INFINITY) | |
629 | return -EOVERFLOW; | |
630 | ||
631 | preferred = be32toh(p->opt.preferred_lifetime) * USEC_PER_SEC; | |
632 | preferred_until = usec_add(preferred, time_now); | |
633 | if (preferred_until == USEC_INFINITY) | |
634 | return -EOVERFLOW; | |
635 | ||
636 | cur->valid_until = valid_until; | |
637 | cur->preferred_until = preferred_until; | |
638 | ||
35388783 | 639 | log_radv(ra, "Updated prefix %s preferred %s valid %s", |
5380707a | 640 | strna(addr_p), |
5291f26d ZJS |
641 | FORMAT_TIMESPAN(preferred, USEC_PER_SEC), |
642 | FORMAT_TIMESPAN(valid, USEC_PER_SEC)); | |
204f99d2 PF |
643 | |
644 | return 0; | |
645 | } | |
646 | ||
34c169c4 | 647 | _public_ sd_radv_prefix *sd_radv_remove_prefix(sd_radv *ra, |
f5a5706a LP |
648 | const struct in6_addr *prefix, |
649 | unsigned char prefixlen) { | |
34c169c4 PF |
650 | sd_radv_prefix *cur, *next; |
651 | ||
652 | assert_return(ra, NULL); | |
653 | assert_return(prefix, NULL); | |
654 | ||
655 | LIST_FOREACH_SAFE(prefix, cur, next, ra->prefixes) { | |
656 | if (prefixlen != cur->opt.prefixlen) | |
657 | continue; | |
658 | ||
94876904 | 659 | if (!in6_addr_equal(prefix, &cur->opt.in6_addr)) |
34c169c4 PF |
660 | continue; |
661 | ||
662 | LIST_REMOVE(prefix, ra->prefixes, cur); | |
663 | ra->n_prefixes--; | |
62bbbedf | 664 | sd_radv_prefix_unref(cur); |
34c169c4 PF |
665 | |
666 | break; | |
667 | } | |
668 | ||
669 | return cur; | |
670 | } | |
671 | ||
203d4df5 | 672 | _public_ int sd_radv_add_route_prefix(sd_radv *ra, sd_radv_route_prefix *p, int dynamic) { |
203d4df5 SS |
673 | usec_t time_now, valid, valid_until; |
674 | _cleanup_free_ char *pretty = NULL; | |
675 | sd_radv_route_prefix *cur; | |
676 | int r; | |
677 | ||
678 | assert_return(ra, -EINVAL); | |
679 | ||
680 | if (!p) | |
681 | return -EINVAL; | |
682 | ||
5380707a | 683 | (void) in_addr_prefix_to_string(AF_INET6, |
c633628d | 684 | (const union in_addr_union*) &p->opt.in6_addr, |
5380707a | 685 | p->opt.prefixlen, &pretty); |
203d4df5 SS |
686 | |
687 | LIST_FOREACH(prefix, cur, ra->route_prefixes) { | |
203d4df5 SS |
688 | |
689 | r = in_addr_prefix_intersect(AF_INET6, | |
c633628d | 690 | (const union in_addr_union*) &cur->opt.in6_addr, |
203d4df5 | 691 | cur->opt.prefixlen, |
c633628d | 692 | (const union in_addr_union*) &p->opt.in6_addr, |
203d4df5 SS |
693 | p->opt.prefixlen); |
694 | if (r < 0) | |
695 | return r; | |
696 | if (r == 0) | |
697 | continue; | |
698 | ||
699 | if (dynamic && cur->opt.prefixlen == p->opt.prefixlen) | |
700 | goto update; | |
701 | ||
5380707a YW |
702 | _cleanup_free_ char *addr = NULL; |
703 | (void) in_addr_prefix_to_string(AF_INET6, | |
c633628d | 704 | (const union in_addr_union*) &cur->opt.in6_addr, |
5380707a | 705 | cur->opt.prefixlen, &addr); |
35388783 YW |
706 | return log_radv_errno(ra, SYNTHETIC_ERRNO(EEXIST), |
707 | "IPv6 route prefix %s already configured, ignoring %s", | |
708 | strna(addr), strna(pretty)); | |
203d4df5 SS |
709 | } |
710 | ||
711 | p = sd_radv_route_prefix_ref(p); | |
712 | ||
713 | LIST_APPEND(prefix, ra->route_prefixes, p); | |
714 | ra->n_route_prefixes++; | |
715 | ||
203d4df5 | 716 | if (!dynamic) { |
35388783 | 717 | log_radv(ra, "Added prefix %s", strna(pretty)); |
203d4df5 SS |
718 | return 0; |
719 | } | |
720 | ||
97efde65 MM |
721 | /* If RAs have already been sent, send an RA immediately to announce the newly-added route prefix */ |
722 | if (ra->ra_sent > 0) { | |
7003b114 | 723 | r = radv_send(ra, NULL, ra->lifetime_usec); |
6333aa9d | 724 | if (r < 0) |
35388783 | 725 | log_radv_errno(ra, r, "Unable to send Router Advertisement for added route prefix: %m"); |
6333aa9d | 726 | else |
35388783 | 727 | log_radv(ra, "Sent Router Advertisement for added route prefix"); |
97efde65 MM |
728 | } |
729 | ||
203d4df5 SS |
730 | update: |
731 | r = sd_event_now(ra->event, clock_boottime_or_monotonic(), &time_now); | |
732 | if (r < 0) | |
733 | return r; | |
734 | ||
735 | valid = be32toh(p->opt.lifetime) * USEC_PER_SEC; | |
736 | valid_until = usec_add(valid, time_now); | |
737 | if (valid_until == USEC_INFINITY) | |
738 | return -EOVERFLOW; | |
739 | ||
35388783 | 740 | log_radv(ra, "Updated route prefix %s valid %s", |
5380707a | 741 | strna(pretty), |
5291f26d | 742 | FORMAT_TIMESPAN(valid, USEC_PER_SEC)); |
203d4df5 SS |
743 | |
744 | return 0; | |
745 | } | |
746 | ||
e9c6da38 PF |
747 | _public_ int sd_radv_set_rdnss(sd_radv *ra, uint32_t lifetime, |
748 | const struct in6_addr *dns, size_t n_dns) { | |
749 | _cleanup_free_ struct sd_radv_opt_dns *opt_rdnss = NULL; | |
750 | size_t len; | |
751 | ||
752 | assert_return(ra, -EINVAL); | |
753 | assert_return(n_dns < 128, -EINVAL); | |
754 | ||
755 | if (!dns || n_dns == 0) { | |
756 | ra->rdnss = mfree(ra->rdnss); | |
757 | ra->n_rdnss = 0; | |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | len = sizeof(struct sd_radv_opt_dns) + sizeof(struct in6_addr) * n_dns; | |
763 | ||
764 | opt_rdnss = malloc0(len); | |
765 | if (!opt_rdnss) | |
766 | return -ENOMEM; | |
767 | ||
768 | opt_rdnss->type = SD_RADV_OPT_RDNSS; | |
769 | opt_rdnss->length = len / 8; | |
770 | opt_rdnss->lifetime = htobe32(lifetime); | |
771 | ||
772 | memcpy(opt_rdnss + 1, dns, n_dns * sizeof(struct in6_addr)); | |
773 | ||
1cc6c93a | 774 | free_and_replace(ra->rdnss, opt_rdnss); |
e9c6da38 PF |
775 | |
776 | ra->n_rdnss = n_dns; | |
777 | ||
778 | return 0; | |
779 | } | |
780 | ||
e965d6ab PF |
781 | _public_ int sd_radv_set_dnssl(sd_radv *ra, uint32_t lifetime, |
782 | char **search_list) { | |
783 | _cleanup_free_ struct sd_radv_opt_dns *opt_dnssl = NULL; | |
784 | size_t len = 0; | |
785 | char **s; | |
786 | uint8_t *p; | |
787 | ||
788 | assert_return(ra, -EINVAL); | |
789 | ||
97d7974b | 790 | if (strv_isempty(search_list)) { |
e965d6ab | 791 | ra->dnssl = mfree(ra->dnssl); |
e965d6ab PF |
792 | return 0; |
793 | } | |
794 | ||
795 | STRV_FOREACH(s, search_list) | |
796 | len += strlen(*s) + 2; | |
797 | ||
798 | len = (sizeof(struct sd_radv_opt_dns) + len + 7) & ~0x7; | |
799 | ||
800 | opt_dnssl = malloc0(len); | |
801 | if (!opt_dnssl) | |
802 | return -ENOMEM; | |
803 | ||
804 | opt_dnssl->type = SD_RADV_OPT_DNSSL; | |
805 | opt_dnssl->length = len / 8; | |
806 | opt_dnssl->lifetime = htobe32(lifetime); | |
807 | ||
808 | p = (uint8_t *)(opt_dnssl + 1); | |
809 | len -= sizeof(struct sd_radv_opt_dns); | |
810 | ||
811 | STRV_FOREACH(s, search_list) { | |
812 | int r; | |
813 | ||
814 | r = dns_name_to_wire_format(*s, p, len, false); | |
815 | if (r < 0) | |
816 | return r; | |
817 | ||
818 | if (len < (size_t)r) | |
819 | return -ENOBUFS; | |
820 | ||
821 | p += r; | |
822 | len -= r; | |
823 | } | |
824 | ||
1cc6c93a | 825 | free_and_replace(ra->dnssl, opt_dnssl); |
e965d6ab PF |
826 | |
827 | return 0; | |
828 | } | |
829 | ||
04473969 | 830 | _public_ int sd_radv_prefix_new(sd_radv_prefix **ret) { |
d2c8eed2 | 831 | sd_radv_prefix *p; |
04473969 PF |
832 | |
833 | assert_return(ret, -EINVAL); | |
834 | ||
d2c8eed2 | 835 | p = new(sd_radv_prefix, 1); |
04473969 PF |
836 | if (!p) |
837 | return -ENOMEM; | |
838 | ||
d2c8eed2 LP |
839 | *p = (sd_radv_prefix) { |
840 | .n_ref = 1, | |
04473969 | 841 | |
d2c8eed2 LP |
842 | .opt.type = ND_OPT_PREFIX_INFORMATION, |
843 | .opt.length = (sizeof(p->opt) - 1)/8 + 1, | |
844 | .opt.prefixlen = 64, | |
04473969 | 845 | |
d2c8eed2 LP |
846 | /* RFC 4861, Section 6.2.1 */ |
847 | .opt.flags = ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO, | |
204f99d2 | 848 | |
d2c8eed2 LP |
849 | .opt.preferred_lifetime = htobe32(604800), |
850 | .opt.valid_lifetime = htobe32(2592000), | |
851 | }; | |
04473969 | 852 | |
d2c8eed2 | 853 | *ret = p; |
04473969 PF |
854 | return 0; |
855 | } | |
856 | ||
8301aa0b | 857 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_prefix, sd_radv_prefix, mfree); |
04473969 | 858 | |
f5a5706a | 859 | _public_ int sd_radv_prefix_set_prefix(sd_radv_prefix *p, const struct in6_addr *in6_addr, |
04473969 PF |
860 | unsigned char prefixlen) { |
861 | assert_return(p, -EINVAL); | |
862 | assert_return(in6_addr, -EINVAL); | |
863 | ||
864 | if (prefixlen < 3 || prefixlen > 128) | |
865 | return -EINVAL; | |
866 | ||
867 | if (prefixlen > 64) | |
868 | /* unusual but allowed, log it */ | |
35388783 | 869 | log_radv(NULL, "Unusual prefix length %d greater than 64", prefixlen); |
04473969 PF |
870 | |
871 | p->opt.in6_addr = *in6_addr; | |
872 | p->opt.prefixlen = prefixlen; | |
873 | ||
874 | return 0; | |
875 | } | |
876 | ||
34332af2 SS |
877 | _public_ int sd_radv_prefix_get_prefix(sd_radv_prefix *p, struct in6_addr *ret_in6_addr, |
878 | unsigned char *ret_prefixlen) { | |
879 | assert_return(p, -EINVAL); | |
880 | assert_return(ret_in6_addr, -EINVAL); | |
881 | assert_return(ret_prefixlen, -EINVAL); | |
882 | ||
883 | *ret_in6_addr = p->opt.in6_addr; | |
884 | *ret_prefixlen = p->opt.prefixlen; | |
885 | ||
886 | return 0; | |
887 | } | |
888 | ||
04473969 PF |
889 | _public_ int sd_radv_prefix_set_onlink(sd_radv_prefix *p, int onlink) { |
890 | assert_return(p, -EINVAL); | |
891 | ||
892 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_ONLINK, onlink); | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | _public_ int sd_radv_prefix_set_address_autoconfiguration(sd_radv_prefix *p, | |
898 | int address_autoconfiguration) { | |
899 | assert_return(p, -EINVAL); | |
900 | ||
901 | SET_FLAG(p->opt.flags, ND_OPT_PI_FLAG_AUTO, address_autoconfiguration); | |
902 | ||
903 | return 0; | |
904 | } | |
905 | ||
906 | _public_ int sd_radv_prefix_set_valid_lifetime(sd_radv_prefix *p, | |
907 | uint32_t valid_lifetime) { | |
908 | assert_return(p, -EINVAL); | |
909 | ||
910 | p->opt.valid_lifetime = htobe32(valid_lifetime); | |
911 | ||
912 | return 0; | |
913 | } | |
914 | ||
915 | _public_ int sd_radv_prefix_set_preferred_lifetime(sd_radv_prefix *p, | |
916 | uint32_t preferred_lifetime) { | |
917 | assert_return(p, -EINVAL); | |
918 | ||
919 | p->opt.preferred_lifetime = htobe32(preferred_lifetime); | |
920 | ||
921 | return 0; | |
922 | } | |
203d4df5 SS |
923 | |
924 | _public_ int sd_radv_route_prefix_new(sd_radv_route_prefix **ret) { | |
925 | sd_radv_route_prefix *p; | |
926 | ||
927 | assert_return(ret, -EINVAL); | |
928 | ||
929 | p = new(sd_radv_route_prefix, 1); | |
930 | if (!p) | |
931 | return -ENOMEM; | |
932 | ||
933 | *p = (sd_radv_route_prefix) { | |
934 | .n_ref = 1, | |
935 | ||
936 | .opt.type = SD_RADV_OPT_ROUTE_INFORMATION, | |
937 | .opt.length = DIV_ROUND_UP(sizeof(p->opt), 8), | |
938 | .opt.prefixlen = 64, | |
939 | ||
940 | .opt.lifetime = htobe32(604800), | |
941 | }; | |
942 | ||
943 | *ret = p; | |
944 | return 0; | |
945 | } | |
946 | ||
947 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_radv_route_prefix, sd_radv_route_prefix, mfree); | |
948 | ||
7ebb1431 | 949 | _public_ int sd_radv_route_prefix_set_prefix(sd_radv_route_prefix *p, const struct in6_addr *in6_addr, |
203d4df5 SS |
950 | unsigned char prefixlen) { |
951 | assert_return(p, -EINVAL); | |
952 | assert_return(in6_addr, -EINVAL); | |
953 | ||
954 | if (prefixlen > 128) | |
955 | return -EINVAL; | |
956 | ||
957 | if (prefixlen > 64) | |
958 | /* unusual but allowed, log it */ | |
35388783 | 959 | log_radv(NULL, "Unusual prefix length %u greater than 64", prefixlen); |
203d4df5 SS |
960 | |
961 | p->opt.in6_addr = *in6_addr; | |
962 | p->opt.prefixlen = prefixlen; | |
963 | ||
964 | return 0; | |
965 | } | |
966 | ||
967 | _public_ int sd_radv_route_prefix_set_lifetime(sd_radv_route_prefix *p, uint32_t valid_lifetime) { | |
968 | assert_return(p, -EINVAL); | |
969 | ||
970 | p->opt.lifetime = htobe32(valid_lifetime); | |
971 | ||
972 | return 0; | |
973 | } |