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e3169126 PF |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2014 Intel Corporation. All rights reserved. | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <netinet/icmp6.h> | |
09667885 | 21 | #include <netinet/ip6.h> |
e3169126 PF |
22 | #include <string.h> |
23 | #include <stdbool.h> | |
24 | #include <netinet/in.h> | |
09667885 | 25 | #include <sys/ioctl.h> |
e3169126 | 26 | |
e3169126 | 27 | #include "async.h" |
940367a0 TG |
28 | #include "list.h" |
29 | #include "socket-util.h" | |
e3169126 | 30 | |
940367a0 | 31 | #include "icmp6-util.h" |
3ad0c5d8 | 32 | #include "sd-ndisc.h" |
e3169126 PF |
33 | |
34 | #define ICMP6_ROUTER_SOLICITATION_INTERVAL 4 * USEC_PER_SEC | |
35 | #define ICMP6_MAX_ROUTER_SOLICITATIONS 3 | |
36 | ||
37 | enum icmp6_nd_state { | |
38 | ICMP6_NEIGHBOR_DISCOVERY_IDLE = 0, | |
39 | ICMP6_ROUTER_SOLICITATION_SENT = 10, | |
40 | ICMP6_ROUTER_ADVERTISMENT_LISTEN = 11, | |
41 | }; | |
42 | ||
09667885 PF |
43 | #define IP6_MIN_MTU (unsigned)1280 |
44 | #define ICMP6_ND_RECV_SIZE (IP6_MIN_MTU - sizeof(struct ip6_hdr)) | |
45 | #define ICMP6_OPT_LEN_UNITS 8 | |
46 | ||
5624c480 PF |
47 | typedef struct ICMP6Prefix ICMP6Prefix; |
48 | ||
49 | struct ICMP6Prefix { | |
9c8e3101 | 50 | unsigned n_ref; |
5624c480 PF |
51 | |
52 | LIST_FIELDS(ICMP6Prefix, prefixes); | |
53 | ||
54 | uint8_t len; | |
55 | sd_event_source *timeout_valid; | |
56 | struct in6_addr addr; | |
57 | }; | |
58 | ||
4d7b83da | 59 | struct sd_ndisc { |
9c8e3101 | 60 | unsigned n_ref; |
e3169126 PF |
61 | |
62 | enum icmp6_nd_state state; | |
63 | sd_event *event; | |
64 | int event_priority; | |
65 | int index; | |
66 | struct ether_addr mac_addr; | |
5624c480 | 67 | uint32_t mtu; |
bd1957e9 | 68 | ICMP6Prefix *expired_prefix; |
5624c480 | 69 | LIST_HEAD(ICMP6Prefix, prefixes); |
e3169126 PF |
70 | int fd; |
71 | sd_event_source *recv; | |
72 | sd_event_source *timeout; | |
73 | int nd_sent; | |
4d7b83da | 74 | sd_ndisc_callback_t callback; |
e3169126 PF |
75 | void *userdata; |
76 | }; | |
77 | ||
79008bdd | 78 | #define log_icmp6_nd(p, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "ICMPv6 CLIENT: " fmt, ##__VA_ARGS__) |
e3169126 | 79 | |
5624c480 | 80 | static ICMP6Prefix *icmp6_prefix_unref(ICMP6Prefix *prefix) { |
5624c480 | 81 | |
9c8e3101 LP |
82 | if (!prefix) |
83 | return NULL; | |
84 | ||
85 | assert(prefix->n_ref > 0); | |
86 | prefix->n_ref--; | |
87 | ||
88 | if (prefix->n_ref > 0) | |
89 | return NULL; | |
5624c480 | 90 | |
9c8e3101 LP |
91 | prefix->timeout_valid = sd_event_source_unref(prefix->timeout_valid); |
92 | free(prefix); | |
5624c480 PF |
93 | return NULL; |
94 | } | |
95 | ||
96 | static int icmp6_prefix_new(ICMP6Prefix **ret) { | |
97 | _cleanup_free_ ICMP6Prefix *prefix = NULL; | |
98 | ||
99 | assert(ret); | |
100 | ||
101 | prefix = new0(ICMP6Prefix, 1); | |
102 | if (!prefix) | |
103 | return -ENOMEM; | |
104 | ||
9c8e3101 | 105 | prefix->n_ref = 1; |
5624c480 PF |
106 | LIST_INIT(prefixes, prefix); |
107 | ||
108 | *ret = prefix; | |
109 | prefix = NULL; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
4d7b83da | 114 | static void icmp6_nd_notify(sd_ndisc *nd, int event) { |
e3169126 PF |
115 | if (nd->callback) |
116 | nd->callback(nd, event, nd->userdata); | |
117 | } | |
118 | ||
4d7b83da | 119 | int sd_ndisc_set_callback(sd_ndisc *nd, sd_ndisc_callback_t callback, |
e3169126 PF |
120 | void *userdata) { |
121 | assert(nd); | |
122 | ||
123 | nd->callback = callback; | |
124 | nd->userdata = userdata; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
4d7b83da | 129 | int sd_ndisc_set_index(sd_ndisc *nd, int interface_index) { |
e3169126 PF |
130 | assert(nd); |
131 | assert(interface_index >= -1); | |
132 | ||
133 | nd->index = interface_index; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
4d7b83da | 138 | int sd_ndisc_set_mac(sd_ndisc *nd, const struct ether_addr *mac_addr) { |
e3169126 PF |
139 | assert(nd); |
140 | ||
141 | if (mac_addr) | |
142 | memcpy(&nd->mac_addr, mac_addr, sizeof(nd->mac_addr)); | |
143 | else | |
eccaf899 | 144 | zero(nd->mac_addr); |
e3169126 PF |
145 | |
146 | return 0; | |
147 | ||
148 | } | |
149 | ||
4d7b83da | 150 | int sd_ndisc_attach_event(sd_ndisc *nd, sd_event *event, int priority) { |
e3169126 PF |
151 | int r; |
152 | ||
153 | assert_return(nd, -EINVAL); | |
154 | assert_return(!nd->event, -EBUSY); | |
155 | ||
156 | if (event) | |
157 | nd->event = sd_event_ref(event); | |
158 | else { | |
159 | r = sd_event_default(&nd->event); | |
160 | if (r < 0) | |
161 | return 0; | |
162 | } | |
163 | ||
164 | nd->event_priority = priority; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
4d7b83da | 169 | int sd_ndisc_detach_event(sd_ndisc *nd) { |
e3169126 PF |
170 | assert_return(nd, -EINVAL); |
171 | ||
172 | nd->event = sd_event_unref(nd->event); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
4d7b83da | 177 | sd_event *sd_ndisc_get_event(sd_ndisc *nd) { |
e3169126 PF |
178 | assert(nd); |
179 | ||
180 | return nd->event; | |
181 | } | |
182 | ||
4d7b83da | 183 | sd_ndisc *sd_ndisc_ref(sd_ndisc *nd) { |
e3169126 | 184 | |
9c8e3101 LP |
185 | if (!nd) |
186 | return NULL; | |
187 | ||
188 | assert(nd->n_ref > 0); | |
189 | nd->n_ref++; | |
e3169126 PF |
190 | |
191 | return nd; | |
192 | } | |
193 | ||
4d7b83da | 194 | static int icmp6_nd_init(sd_ndisc *nd) { |
e3169126 PF |
195 | assert(nd); |
196 | ||
197 | nd->recv = sd_event_source_unref(nd->recv); | |
198 | nd->fd = asynchronous_close(nd->fd); | |
199 | nd->timeout = sd_event_source_unref(nd->timeout); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
4d7b83da | 204 | sd_ndisc *sd_ndisc_unref(sd_ndisc *nd) { |
9c8e3101 | 205 | ICMP6Prefix *prefix, *p; |
e3169126 | 206 | |
9c8e3101 LP |
207 | if (!nd) |
208 | return NULL; | |
209 | ||
210 | assert(nd->n_ref > 0); | |
211 | nd->n_ref--; | |
212 | ||
213 | if (nd->n_ref > 0) | |
214 | return NULL; | |
e3169126 | 215 | |
9c8e3101 | 216 | icmp6_nd_init(nd); |
4d7b83da | 217 | sd_ndisc_detach_event(nd); |
5624c480 | 218 | |
9c8e3101 LP |
219 | LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) { |
220 | LIST_REMOVE(prefixes, nd->prefixes, prefix); | |
5624c480 | 221 | |
9c8e3101 | 222 | prefix = icmp6_prefix_unref(prefix); |
e3169126 PF |
223 | } |
224 | ||
9c8e3101 LP |
225 | free(nd); |
226 | ||
e3169126 PF |
227 | return NULL; |
228 | } | |
229 | ||
4d7b83da TG |
230 | DEFINE_TRIVIAL_CLEANUP_FUNC(sd_ndisc*, sd_ndisc_unref); |
231 | #define _cleanup_sd_ndisc_free_ _cleanup_(sd_ndisc_unrefp) | |
e3169126 | 232 | |
4d7b83da TG |
233 | int sd_ndisc_new(sd_ndisc **ret) { |
234 | _cleanup_sd_ndisc_free_ sd_ndisc *nd = NULL; | |
e3169126 PF |
235 | |
236 | assert(ret); | |
237 | ||
4d7b83da | 238 | nd = new0(sd_ndisc, 1); |
e3169126 PF |
239 | if (!nd) |
240 | return -ENOMEM; | |
241 | ||
9c8e3101 | 242 | nd->n_ref = 1; |
e3169126 PF |
243 | |
244 | nd->index = -1; | |
03de7ed9 | 245 | nd->fd = -1; |
e3169126 | 246 | |
5624c480 PF |
247 | LIST_HEAD_INIT(nd->prefixes); |
248 | ||
e3169126 PF |
249 | *ret = nd; |
250 | nd = NULL; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
4d7b83da | 255 | int sd_ndisc_get_mtu(sd_ndisc *nd, uint32_t *mtu) { |
d14b5bc6 PF |
256 | assert_return(nd, -EINVAL); |
257 | assert_return(mtu, -EINVAL); | |
258 | ||
259 | if (nd->mtu == 0) | |
260 | return -ENOMSG; | |
261 | ||
262 | *mtu = nd->mtu; | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
d77bde34 PF |
267 | static int icmp6_ra_prefix_timeout(sd_event_source *s, uint64_t usec, |
268 | void *userdata) { | |
4d7b83da | 269 | sd_ndisc *nd = userdata; |
d77bde34 PF |
270 | ICMP6Prefix *prefix, *p; |
271 | ||
272 | assert(nd); | |
273 | ||
274 | LIST_FOREACH_SAFE(prefixes, prefix, p, nd->prefixes) { | |
275 | if (prefix->timeout_valid != s) | |
276 | continue; | |
277 | ||
4d7b83da TG |
278 | log_icmp6_nd(nd, "Prefix expired "SD_NDISC_ADDRESS_FORMAT_STR"/%d", |
279 | SD_NDISC_ADDRESS_FORMAT_VAL(prefix->addr), | |
d77bde34 PF |
280 | prefix->len); |
281 | ||
282 | LIST_REMOVE(prefixes, nd->prefixes, prefix); | |
283 | ||
bd1957e9 | 284 | nd->expired_prefix = prefix; |
d77bde34 | 285 | icmp6_nd_notify(nd, |
4d7b83da | 286 | SD_NDISC_EVENT_ROUTER_ADVERTISMENT_PREFIX_EXPIRED); |
bd1957e9 PF |
287 | nd->expired_prefix = NULL; |
288 | ||
d77bde34 PF |
289 | prefix = icmp6_prefix_unref(prefix); |
290 | ||
291 | break; | |
292 | } | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
4d7b83da | 297 | static int icmp6_ra_prefix_set_timeout(sd_ndisc *nd, |
d77bde34 PF |
298 | ICMP6Prefix *prefix, |
299 | usec_t valid) { | |
300 | usec_t time_now; | |
301 | int r; | |
302 | ||
303 | assert_return(prefix, -EINVAL); | |
304 | ||
305 | r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now); | |
306 | if (r < 0) | |
307 | return r; | |
308 | ||
309 | prefix->timeout_valid = sd_event_source_unref(prefix->timeout_valid); | |
310 | ||
311 | r = sd_event_add_time(nd->event, &prefix->timeout_valid, | |
312 | clock_boottime_or_monotonic(), time_now + valid, | |
313 | USEC_PER_SEC, icmp6_ra_prefix_timeout, nd); | |
314 | if (r < 0) | |
315 | goto error; | |
316 | ||
317 | r = sd_event_source_set_priority(prefix->timeout_valid, | |
318 | nd->event_priority); | |
319 | if (r < 0) | |
320 | goto error; | |
321 | ||
322 | r = sd_event_source_set_description(prefix->timeout_valid, | |
323 | "icmp6-prefix-timeout"); | |
324 | ||
325 | error: | |
326 | if (r < 0) | |
327 | prefix->timeout_valid = | |
328 | sd_event_source_unref(prefix->timeout_valid); | |
329 | ||
330 | return r; | |
331 | } | |
332 | ||
333 | static int icmp6_prefix_match(const struct in6_addr *prefix, uint8_t prefixlen, | |
334 | const struct in6_addr *addr, | |
335 | uint8_t addr_prefixlen) { | |
336 | uint8_t bytes, mask, len; | |
337 | ||
338 | assert_return(prefix, -EINVAL); | |
339 | assert_return(addr, -EINVAL); | |
340 | ||
341 | len = MIN(prefixlen, addr_prefixlen); | |
342 | ||
343 | bytes = len / 8; | |
344 | mask = 0xff << (8 - len % 8); | |
345 | ||
346 | if (memcmp(prefix, addr, bytes) != 0 || | |
347 | (prefix->s6_addr[bytes] & mask) != (addr->s6_addr[bytes] & mask)) | |
348 | return -EADDRNOTAVAIL; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | static int icmp6_ra_prefix_match(ICMP6Prefix *head, const struct in6_addr *addr, | |
354 | uint8_t addr_len, ICMP6Prefix **result) { | |
355 | ICMP6Prefix *prefix; | |
356 | ||
357 | LIST_FOREACH(prefixes, prefix, head) { | |
358 | if (icmp6_prefix_match(&prefix->addr, prefix->len, addr, | |
359 | addr_len) >= 0) { | |
360 | *result = prefix; | |
361 | return 0; | |
362 | } | |
363 | } | |
364 | ||
365 | return -EADDRNOTAVAIL; | |
366 | } | |
367 | ||
4d7b83da | 368 | int sd_ndisc_prefix_match(struct in6_addr *prefix, uint8_t prefixlen, |
d77bde34 PF |
369 | struct in6_addr *addr) { |
370 | return icmp6_prefix_match(prefix, prefixlen, addr, | |
371 | sizeof(addr->s6_addr) * 8); | |
372 | } | |
373 | ||
4d7b83da | 374 | int sd_ndisc_get_prefixlen(sd_ndisc *nd, const struct in6_addr *addr, |
d77bde34 PF |
375 | uint8_t *prefixlen) { |
376 | int r; | |
377 | ICMP6Prefix *prefix; | |
378 | ||
379 | assert_return(nd, -EINVAL); | |
380 | assert_return(addr, -EINVAL); | |
381 | assert_return(prefixlen, -EINVAL); | |
382 | ||
383 | r = icmp6_ra_prefix_match(nd->prefixes, addr, | |
384 | sizeof(addr->s6_addr) * 8, &prefix); | |
385 | if (r < 0) | |
386 | return r; | |
387 | ||
388 | *prefixlen = prefix->len; | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
4d7b83da | 393 | int sd_ndisc_get_expired_prefix(sd_ndisc *nd, struct in6_addr **addr, uint8_t *prefixlen) { |
bd1957e9 PF |
394 | assert_return(nd, -EINVAL); |
395 | assert_return(addr, -EINVAL); | |
396 | assert_return(prefixlen, -EINVAL); | |
397 | ||
398 | if (!nd->expired_prefix) | |
399 | return -EADDRNOTAVAIL; | |
400 | ||
401 | *addr = &nd->expired_prefix->addr; | |
402 | *prefixlen = nd->expired_prefix->len; | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
4d7b83da | 407 | static int icmp6_ra_prefix_update(sd_ndisc *nd, ssize_t len, |
d77bde34 PF |
408 | const struct nd_opt_prefix_info *prefix_opt) { |
409 | int r; | |
410 | ICMP6Prefix *prefix; | |
411 | uint32_t lifetime; | |
412 | char time_string[FORMAT_TIMESPAN_MAX]; | |
413 | ||
414 | assert_return(nd, -EINVAL); | |
415 | assert_return(prefix_opt, -EINVAL); | |
416 | ||
417 | if (len < prefix_opt->nd_opt_pi_len) | |
418 | return -ENOMSG; | |
419 | ||
420 | if (!(prefix_opt->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK)) | |
421 | return 0; | |
422 | ||
423 | lifetime = be32toh(prefix_opt->nd_opt_pi_valid_time); | |
424 | ||
425 | r = icmp6_ra_prefix_match(nd->prefixes, | |
426 | &prefix_opt->nd_opt_pi_prefix, | |
427 | prefix_opt->nd_opt_pi_prefix_len, &prefix); | |
428 | ||
429 | if (r < 0 && r != -EADDRNOTAVAIL) | |
430 | return r; | |
431 | ||
432 | /* if router advertisment prefix valid timeout is zero, the timeout | |
433 | callback will be called immediately to clean up the prefix */ | |
434 | ||
435 | if (r == -EADDRNOTAVAIL) { | |
436 | r = icmp6_prefix_new(&prefix); | |
437 | if (r < 0) | |
438 | return r; | |
439 | ||
440 | prefix->len = prefix_opt->nd_opt_pi_prefix_len; | |
441 | ||
442 | memcpy(&prefix->addr, &prefix_opt->nd_opt_pi_prefix, | |
443 | sizeof(prefix->addr)); | |
444 | ||
4d7b83da TG |
445 | log_icmp6_nd(nd, "New prefix "SD_NDISC_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s", |
446 | SD_NDISC_ADDRESS_FORMAT_VAL(prefix->addr), | |
d77bde34 | 447 | prefix->len, lifetime, |
ed19c567 | 448 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime * USEC_PER_SEC, USEC_PER_SEC)); |
d77bde34 PF |
449 | |
450 | LIST_PREPEND(prefixes, nd->prefixes, prefix); | |
451 | ||
452 | } else { | |
453 | if (prefix->len != prefix_opt->nd_opt_pi_prefix_len) { | |
454 | uint8_t prefixlen; | |
455 | ||
456 | prefixlen = MIN(prefix->len, prefix_opt->nd_opt_pi_prefix_len); | |
457 | ||
458 | log_icmp6_nd(nd, "Prefix length mismatch %d/%d using %d", | |
459 | prefix->len, | |
460 | prefix_opt->nd_opt_pi_prefix_len, | |
461 | prefixlen); | |
462 | ||
463 | prefix->len = prefixlen; | |
464 | } | |
465 | ||
4d7b83da TG |
466 | log_icmp6_nd(nd, "Update prefix "SD_NDISC_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s", |
467 | SD_NDISC_ADDRESS_FORMAT_VAL(prefix->addr), | |
d77bde34 | 468 | prefix->len, lifetime, |
ed19c567 | 469 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime * USEC_PER_SEC, USEC_PER_SEC)); |
d77bde34 PF |
470 | } |
471 | ||
472 | r = icmp6_ra_prefix_set_timeout(nd, prefix, lifetime * USEC_PER_SEC); | |
473 | ||
474 | return r; | |
475 | } | |
476 | ||
4d7b83da | 477 | static int icmp6_ra_parse(sd_ndisc *nd, struct nd_router_advert *ra, |
09667885 PF |
478 | ssize_t len) { |
479 | void *opt; | |
480 | struct nd_opt_hdr *opt_hdr; | |
481 | ||
482 | assert_return(nd, -EINVAL); | |
483 | assert_return(ra, -EINVAL); | |
484 | ||
485 | len -= sizeof(*ra); | |
486 | if (len < ICMP6_OPT_LEN_UNITS) { | |
487 | log_icmp6_nd(nd, "Router Advertisement below minimum length"); | |
488 | ||
489 | return -ENOMSG; | |
490 | } | |
491 | ||
492 | opt = ra + 1; | |
493 | opt_hdr = opt; | |
494 | ||
495 | while (len != 0 && len >= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS) { | |
d14b5bc6 PF |
496 | struct nd_opt_mtu *opt_mtu; |
497 | uint32_t mtu; | |
d77bde34 | 498 | struct nd_opt_prefix_info *opt_prefix; |
09667885 PF |
499 | |
500 | if (opt_hdr->nd_opt_len == 0) | |
501 | return -ENOMSG; | |
502 | ||
503 | switch (opt_hdr->nd_opt_type) { | |
d14b5bc6 PF |
504 | case ND_OPT_MTU: |
505 | opt_mtu = opt; | |
506 | ||
507 | mtu = be32toh(opt_mtu->nd_opt_mtu_mtu); | |
508 | ||
509 | if (mtu != nd->mtu) { | |
510 | nd->mtu = MAX(mtu, IP6_MIN_MTU); | |
511 | ||
512 | log_icmp6_nd(nd, "Router Advertisement link MTU %d using %d", | |
513 | mtu, nd->mtu); | |
514 | } | |
515 | ||
516 | break; | |
09667885 | 517 | |
d77bde34 PF |
518 | case ND_OPT_PREFIX_INFORMATION: |
519 | opt_prefix = opt; | |
520 | ||
521 | icmp6_ra_prefix_update(nd, len, opt_prefix); | |
522 | ||
523 | break; | |
09667885 PF |
524 | } |
525 | ||
526 | len -= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS; | |
527 | opt = (void *)((char *)opt + | |
528 | opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS); | |
529 | opt_hdr = opt; | |
530 | } | |
531 | ||
532 | if (len > 0) | |
533 | log_icmp6_nd(nd, "Router Advertisement contains %zd bytes of trailing garbage", len); | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
52efd56a | 538 | static int icmp6_router_advertisment_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
4d7b83da | 539 | sd_ndisc *nd = userdata; |
09667885 | 540 | int r, buflen = 0; |
e3169126 | 541 | ssize_t len; |
09667885 | 542 | _cleanup_free_ struct nd_router_advert *ra = NULL; |
4d7b83da | 543 | int event = SD_NDISC_EVENT_ROUTER_ADVERTISMENT_NONE; |
e3169126 PF |
544 | |
545 | assert(s); | |
546 | assert(nd); | |
547 | assert(nd->event); | |
548 | ||
09667885 PF |
549 | r = ioctl(fd, FIONREAD, &buflen); |
550 | if (r < 0 || buflen <= 0) | |
551 | buflen = ICMP6_ND_RECV_SIZE; | |
552 | ||
553 | ra = malloc(buflen); | |
554 | if (!ra) | |
555 | return -ENOMEM; | |
556 | ||
557 | len = read(fd, ra, buflen); | |
558 | if (len < 0) { | |
559 | log_icmp6_nd(nd, "Could not receive message from UDP socket: %m"); | |
e3169126 | 560 | return 0; |
09667885 | 561 | } |
e3169126 | 562 | |
09667885 | 563 | if (ra->nd_ra_type != ND_ROUTER_ADVERT) |
e3169126 PF |
564 | return 0; |
565 | ||
09667885 | 566 | if (ra->nd_ra_code != 0) |
e3169126 PF |
567 | return 0; |
568 | ||
569 | nd->timeout = sd_event_source_unref(nd->timeout); | |
570 | ||
571 | nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN; | |
572 | ||
09667885 | 573 | if (ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER ) |
4d7b83da | 574 | event = SD_NDISC_EVENT_ROUTER_ADVERTISMENT_OTHER; |
e3169126 | 575 | |
09667885 | 576 | if (ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) |
4d7b83da | 577 | event = SD_NDISC_EVENT_ROUTER_ADVERTISMENT_MANAGED; |
e3169126 | 578 | |
06b643e7 | 579 | log_icmp6_nd(nd, "Received Router Advertisement flags %s/%s", |
09667885 PF |
580 | ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED? "MANAGED": "none", |
581 | ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER? "OTHER": "none"); | |
582 | ||
4d7b83da | 583 | if (event != SD_NDISC_EVENT_ROUTER_ADVERTISMENT_NONE) { |
09667885 PF |
584 | r = icmp6_ra_parse(nd, ra, len); |
585 | if (r < 0) { | |
586 | log_icmp6_nd(nd, "Could not parse Router Advertisement: %s", | |
587 | strerror(-r)); | |
588 | return 0; | |
589 | } | |
590 | } | |
e3169126 PF |
591 | |
592 | icmp6_nd_notify(nd, event); | |
593 | ||
594 | return 0; | |
595 | } | |
596 | ||
52efd56a | 597 | static int icmp6_router_solicitation_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
4d7b83da | 598 | sd_ndisc *nd = userdata; |
e3169126 PF |
599 | uint64_t time_now, next_timeout; |
600 | struct ether_addr unset = { }; | |
601 | struct ether_addr *addr = NULL; | |
602 | int r; | |
603 | ||
604 | assert(s); | |
605 | assert(nd); | |
606 | assert(nd->event); | |
607 | ||
608 | nd->timeout = sd_event_source_unref(nd->timeout); | |
609 | ||
610 | if (nd->nd_sent >= ICMP6_MAX_ROUTER_SOLICITATIONS) { | |
4d7b83da | 611 | icmp6_nd_notify(nd, SD_NDISC_EVENT_ROUTER_ADVERTISMENT_TIMEOUT); |
e3169126 PF |
612 | nd->state = ICMP6_ROUTER_ADVERTISMENT_LISTEN; |
613 | } else { | |
614 | if (memcmp(&nd->mac_addr, &unset, sizeof(struct ether_addr))) | |
615 | addr = &nd->mac_addr; | |
616 | ||
940367a0 | 617 | r = icmp6_send_router_solicitation(nd->fd, addr); |
e3169126 PF |
618 | if (r < 0) |
619 | log_icmp6_nd(nd, "Error sending Router Solicitation"); | |
620 | else { | |
621 | nd->state = ICMP6_ROUTER_SOLICITATION_SENT; | |
622 | log_icmp6_nd(nd, "Sent Router Solicitation"); | |
623 | } | |
624 | ||
625 | nd->nd_sent++; | |
626 | ||
fa94c34b | 627 | r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now); |
e3169126 PF |
628 | if (r < 0) { |
629 | icmp6_nd_notify(nd, r); | |
630 | return 0; | |
631 | } | |
632 | ||
633 | next_timeout = time_now + ICMP6_ROUTER_SOLICITATION_INTERVAL; | |
634 | ||
fa94c34b | 635 | r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(), |
e3169126 PF |
636 | next_timeout, 0, |
637 | icmp6_router_solicitation_timeout, nd); | |
638 | if (r < 0) { | |
639 | icmp6_nd_notify(nd, r); | |
640 | return 0; | |
641 | } | |
642 | ||
643 | r = sd_event_source_set_priority(nd->timeout, | |
644 | nd->event_priority); | |
645 | if (r < 0) { | |
646 | icmp6_nd_notify(nd, r); | |
647 | return 0; | |
648 | } | |
9021bb9f | 649 | |
356779df | 650 | r = sd_event_source_set_description(nd->timeout, "icmp6-timeout"); |
9021bb9f TG |
651 | if (r < 0) { |
652 | icmp6_nd_notify(nd, r); | |
653 | return 0; | |
654 | } | |
e3169126 PF |
655 | } |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
4d7b83da | 660 | int sd_ndisc_stop(sd_ndisc *nd) { |
836cf090 PF |
661 | assert_return(nd, -EINVAL); |
662 | assert_return(nd->event, -EINVAL); | |
663 | ||
664 | log_icmp6_nd(client, "Stop ICMPv6"); | |
665 | ||
666 | icmp6_nd_init(nd); | |
667 | ||
668 | nd->state = ICMP6_NEIGHBOR_DISCOVERY_IDLE; | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
4d7b83da | 673 | int sd_ndisc_router_discovery_start(sd_ndisc *nd) { |
e3169126 PF |
674 | int r; |
675 | ||
676 | assert(nd); | |
677 | assert(nd->event); | |
678 | ||
679 | if (nd->state != ICMP6_NEIGHBOR_DISCOVERY_IDLE) | |
680 | return -EINVAL; | |
681 | ||
682 | if (nd->index < 1) | |
683 | return -EINVAL; | |
684 | ||
940367a0 | 685 | r = icmp6_bind_router_solicitation(nd->index); |
e3169126 PF |
686 | if (r < 0) |
687 | return r; | |
688 | ||
689 | nd->fd = r; | |
690 | ||
691 | r = sd_event_add_io(nd->event, &nd->recv, nd->fd, EPOLLIN, | |
692 | icmp6_router_advertisment_recv, nd); | |
693 | if (r < 0) | |
694 | goto error; | |
695 | ||
696 | r = sd_event_source_set_priority(nd->recv, nd->event_priority); | |
697 | if (r < 0) | |
698 | goto error; | |
699 | ||
356779df | 700 | r = sd_event_source_set_description(nd->recv, "icmp6-receive-message"); |
9021bb9f TG |
701 | if (r < 0) |
702 | goto error; | |
703 | ||
fa94c34b | 704 | r = sd_event_add_time(nd->event, &nd->timeout, clock_boottime_or_monotonic(), |
e3169126 PF |
705 | 0, 0, icmp6_router_solicitation_timeout, nd); |
706 | if (r < 0) | |
707 | goto error; | |
708 | ||
709 | r = sd_event_source_set_priority(nd->timeout, nd->event_priority); | |
9021bb9f TG |
710 | if (r < 0) |
711 | goto error; | |
e3169126 | 712 | |
356779df | 713 | r = sd_event_source_set_description(nd->timeout, "icmp6-timeout"); |
e3169126 PF |
714 | error: |
715 | if (r < 0) | |
716 | icmp6_nd_init(nd); | |
717 | else | |
718 | log_icmp6_nd(client, "Start Router Solicitation"); | |
719 | ||
720 | return r; | |
721 | } |