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Commit | Line | Data |
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a032b68d | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
5a920b42 | 2 | /*** |
b012e921 | 3 | Copyright © 2014 Intel Corporation. All rights reserved. |
5a920b42 MP |
4 | ***/ |
5 | ||
6 | #include <netinet/icmp6.h> | |
7 | ||
8 | #include "sd-ndisc.h" | |
9 | ||
10 | #include "alloc-util.h" | |
11 | #include "dns-domain.h" | |
12 | #include "hostname-util.h" | |
bb4f798a | 13 | #include "memory-util.h" |
e1f67bc7 | 14 | #include "missing_network.h" |
5a920b42 MP |
15 | #include "ndisc-internal.h" |
16 | #include "ndisc-router.h" | |
17 | #include "strv.h" | |
18 | ||
6e866b33 | 19 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_ndisc_router, sd_ndisc_router, mfree); |
5a920b42 MP |
20 | |
21 | sd_ndisc_router *ndisc_router_new(size_t raw_size) { | |
22 | sd_ndisc_router *rt; | |
23 | ||
8f232108 MB |
24 | if (raw_size > SIZE_MAX - ALIGN(sizeof(sd_ndisc_router))) |
25 | return NULL; | |
26 | ||
5a920b42 MP |
27 | rt = malloc0(ALIGN(sizeof(sd_ndisc_router)) + raw_size); |
28 | if (!rt) | |
29 | return NULL; | |
30 | ||
31 | rt->raw_size = raw_size; | |
32 | rt->n_ref = 1; | |
33 | ||
34 | return rt; | |
35 | } | |
36 | ||
ea0999c9 | 37 | int sd_ndisc_router_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr) { |
5a920b42 MP |
38 | assert_return(rt, -EINVAL); |
39 | assert_return(ret_addr, -EINVAL); | |
40 | ||
3a6ce677 | 41 | if (in6_addr_is_null(&rt->address)) |
5a920b42 MP |
42 | return -ENODATA; |
43 | ||
44 | *ret_addr = rt->address; | |
45 | return 0; | |
46 | } | |
47 | ||
ea0999c9 | 48 | int sd_ndisc_router_get_timestamp(sd_ndisc_router *rt, clockid_t clock, uint64_t *ret) { |
5a920b42 MP |
49 | assert_return(rt, -EINVAL); |
50 | assert_return(TRIPLE_TIMESTAMP_HAS_CLOCK(clock), -EOPNOTSUPP); | |
51 | assert_return(clock_supported(clock), -EOPNOTSUPP); | |
52 | assert_return(ret, -EINVAL); | |
53 | ||
54 | if (!triple_timestamp_is_set(&rt->timestamp)) | |
55 | return -ENODATA; | |
56 | ||
57 | *ret = triple_timestamp_by_clock(&rt->timestamp, clock); | |
58 | return 0; | |
59 | } | |
60 | ||
ea0999c9 | 61 | int sd_ndisc_router_get_raw(sd_ndisc_router *rt, const void **ret, size_t *size) { |
5a920b42 MP |
62 | assert_return(rt, -EINVAL); |
63 | assert_return(ret, -EINVAL); | |
64 | assert_return(size, -EINVAL); | |
65 | ||
66 | *ret = NDISC_ROUTER_RAW(rt); | |
67 | *size = rt->raw_size; | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
8b3d4ff0 | 72 | int ndisc_router_parse(sd_ndisc *nd, sd_ndisc_router *rt) { |
5a920b42 MP |
73 | struct nd_router_advert *a; |
74 | const uint8_t *p; | |
75 | bool has_mtu = false, has_flag_extension = false; | |
76 | size_t left; | |
77 | ||
78 | assert(rt); | |
79 | ||
8b3d4ff0 MB |
80 | if (rt->raw_size < sizeof(struct nd_router_advert)) |
81 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
82 | "Too small to be a router advertisement, ignoring."); | |
5a920b42 MP |
83 | |
84 | /* Router advertisement packets are neatly aligned to 64bit boundaries, hence we can access them directly */ | |
85 | a = NDISC_ROUTER_RAW(rt); | |
86 | ||
8b3d4ff0 MB |
87 | if (a->nd_ra_type != ND_ROUTER_ADVERT) |
88 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
89 | "Received ND packet that is not a router advertisement, ignoring."); | |
5a920b42 | 90 | |
8b3d4ff0 MB |
91 | if (a->nd_ra_code != 0) |
92 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
93 | "Received ND packet with wrong RA code, ignoring."); | |
5a920b42 MP |
94 | |
95 | rt->hop_limit = a->nd_ra_curhoplimit; | |
96 | rt->flags = a->nd_ra_flags_reserved; /* the first 8bit */ | |
97 | rt->lifetime = be16toh(a->nd_ra_router_lifetime); | |
98 | ||
99 | rt->preference = (rt->flags >> 3) & 3; | |
100 | if (!IN_SET(rt->preference, SD_NDISC_PREFERENCE_LOW, SD_NDISC_PREFERENCE_HIGH)) | |
101 | rt->preference = SD_NDISC_PREFERENCE_MEDIUM; | |
102 | ||
103 | p = (const uint8_t*) NDISC_ROUTER_RAW(rt) + sizeof(struct nd_router_advert); | |
104 | left = rt->raw_size - sizeof(struct nd_router_advert); | |
105 | ||
106 | for (;;) { | |
107 | uint8_t type; | |
108 | size_t length; | |
109 | ||
110 | if (left == 0) | |
111 | break; | |
112 | ||
8b3d4ff0 MB |
113 | if (left < 2) |
114 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
115 | "Option lacks header, ignoring datagram."); | |
5a920b42 MP |
116 | |
117 | type = p[0]; | |
118 | length = p[1] * 8; | |
119 | ||
8b3d4ff0 MB |
120 | if (length == 0) |
121 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
122 | "Zero-length option, ignoring datagram."); | |
123 | if (left < length) | |
124 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
125 | "Option truncated, ignoring datagram."); | |
5a920b42 MP |
126 | |
127 | switch (type) { | |
128 | ||
129 | case SD_NDISC_OPTION_PREFIX_INFORMATION: | |
130 | ||
8b3d4ff0 MB |
131 | if (length != 4*8) |
132 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
133 | "Prefix option of invalid size, ignoring datagram."); | |
5a920b42 | 134 | |
8b3d4ff0 MB |
135 | if (p[2] > 128) |
136 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
137 | "Bad prefix length, ignoring datagram."); | |
5a920b42 MP |
138 | |
139 | break; | |
140 | ||
141 | case SD_NDISC_OPTION_MTU: { | |
142 | uint32_t m; | |
143 | ||
144 | if (has_mtu) { | |
8b3d4ff0 | 145 | log_ndisc(nd, "MTU option specified twice, ignoring."); |
6e866b33 | 146 | break; |
5a920b42 MP |
147 | } |
148 | ||
8b3d4ff0 MB |
149 | if (length != 8) |
150 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
151 | "MTU option of invalid size, ignoring datagram."); | |
5a920b42 MP |
152 | |
153 | m = be32toh(*(uint32_t*) (p + 4)); | |
154 | if (m >= IPV6_MIN_MTU) /* ignore invalidly small MTUs */ | |
155 | rt->mtu = m; | |
156 | ||
157 | has_mtu = true; | |
158 | break; | |
159 | } | |
160 | ||
161 | case SD_NDISC_OPTION_ROUTE_INFORMATION: | |
8b3d4ff0 MB |
162 | if (length < 1*8 || length > 3*8) |
163 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
164 | "Route information option of invalid size, ignoring datagram."); | |
5a920b42 | 165 | |
8b3d4ff0 MB |
166 | if (p[2] > 128) |
167 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
168 | "Bad route prefix length, ignoring datagram."); | |
5a920b42 MP |
169 | |
170 | break; | |
171 | ||
172 | case SD_NDISC_OPTION_RDNSS: | |
8b3d4ff0 MB |
173 | if (length < 3*8 || (length % (2*8)) != 1*8) |
174 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), "RDNSS option has invalid size."); | |
5a920b42 MP |
175 | |
176 | break; | |
177 | ||
178 | case SD_NDISC_OPTION_FLAGS_EXTENSION: | |
179 | ||
180 | if (has_flag_extension) { | |
8b3d4ff0 | 181 | log_ndisc(nd, "Flags extension option specified twice, ignoring."); |
6e866b33 | 182 | break; |
5a920b42 MP |
183 | } |
184 | ||
8b3d4ff0 MB |
185 | if (length < 1*8) |
186 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
187 | "Flags extension option has invalid size."); | |
5a920b42 MP |
188 | |
189 | /* Add in the additional flags bits */ | |
190 | rt->flags |= | |
191 | ((uint64_t) p[2] << 8) | | |
192 | ((uint64_t) p[3] << 16) | | |
193 | ((uint64_t) p[4] << 24) | | |
194 | ((uint64_t) p[5] << 32) | | |
195 | ((uint64_t) p[6] << 40) | | |
196 | ((uint64_t) p[7] << 48); | |
197 | ||
198 | has_flag_extension = true; | |
199 | break; | |
200 | ||
201 | case SD_NDISC_OPTION_DNSSL: | |
8b3d4ff0 MB |
202 | if (length < 2*8) |
203 | return log_ndisc_errno(nd, SYNTHETIC_ERRNO(EBADMSG), | |
204 | "DNSSL option has invalid size."); | |
5a920b42 MP |
205 | |
206 | break; | |
207 | } | |
208 | ||
209 | p += length, left -= length; | |
210 | } | |
211 | ||
212 | rt->rindex = sizeof(struct nd_router_advert); | |
213 | return 0; | |
214 | } | |
215 | ||
ea0999c9 | 216 | int sd_ndisc_router_get_hop_limit(sd_ndisc_router *rt, uint8_t *ret) { |
5a920b42 MP |
217 | assert_return(rt, -EINVAL); |
218 | assert_return(ret, -EINVAL); | |
219 | ||
220 | *ret = rt->hop_limit; | |
221 | return 0; | |
222 | } | |
223 | ||
ea0999c9 | 224 | int sd_ndisc_router_get_flags(sd_ndisc_router *rt, uint64_t *ret_flags) { |
5a920b42 MP |
225 | assert_return(rt, -EINVAL); |
226 | assert_return(ret_flags, -EINVAL); | |
227 | ||
228 | *ret_flags = rt->flags; | |
229 | return 0; | |
230 | } | |
231 | ||
ea0999c9 | 232 | int sd_ndisc_router_get_lifetime(sd_ndisc_router *rt, uint16_t *ret_lifetime) { |
5a920b42 MP |
233 | assert_return(rt, -EINVAL); |
234 | assert_return(ret_lifetime, -EINVAL); | |
235 | ||
236 | *ret_lifetime = rt->lifetime; | |
237 | return 0; | |
238 | } | |
239 | ||
ea0999c9 | 240 | int sd_ndisc_router_get_preference(sd_ndisc_router *rt, unsigned *ret) { |
5a920b42 MP |
241 | assert_return(rt, -EINVAL); |
242 | assert_return(ret, -EINVAL); | |
243 | ||
244 | *ret = rt->preference; | |
245 | return 0; | |
246 | } | |
247 | ||
ea0999c9 | 248 | int sd_ndisc_router_get_mtu(sd_ndisc_router *rt, uint32_t *ret) { |
5a920b42 MP |
249 | assert_return(rt, -EINVAL); |
250 | assert_return(ret, -EINVAL); | |
251 | ||
252 | if (rt->mtu <= 0) | |
253 | return -ENODATA; | |
254 | ||
255 | *ret = rt->mtu; | |
256 | return 0; | |
257 | } | |
258 | ||
ea0999c9 | 259 | int sd_ndisc_router_option_rewind(sd_ndisc_router *rt) { |
5a920b42 MP |
260 | assert_return(rt, -EINVAL); |
261 | ||
262 | assert(rt->raw_size >= sizeof(struct nd_router_advert)); | |
263 | rt->rindex = sizeof(struct nd_router_advert); | |
264 | ||
265 | return rt->rindex < rt->raw_size; | |
266 | } | |
267 | ||
ea0999c9 | 268 | int sd_ndisc_router_option_next(sd_ndisc_router *rt) { |
5a920b42 MP |
269 | size_t length; |
270 | ||
271 | assert_return(rt, -EINVAL); | |
272 | ||
273 | if (rt->rindex == rt->raw_size) /* EOF */ | |
274 | return -ESPIPE; | |
275 | ||
276 | if (rt->rindex + 2 > rt->raw_size) /* Truncated message */ | |
277 | return -EBADMSG; | |
278 | ||
279 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
280 | if (rt->rindex + length > rt->raw_size) | |
281 | return -EBADMSG; | |
282 | ||
283 | rt->rindex += length; | |
284 | return rt->rindex < rt->raw_size; | |
285 | } | |
286 | ||
ea0999c9 | 287 | int sd_ndisc_router_option_get_type(sd_ndisc_router *rt, uint8_t *ret) { |
5a920b42 MP |
288 | assert_return(rt, -EINVAL); |
289 | assert_return(ret, -EINVAL); | |
290 | ||
291 | if (rt->rindex == rt->raw_size) /* EOF */ | |
292 | return -ESPIPE; | |
293 | ||
294 | if (rt->rindex + 2 > rt->raw_size) /* Truncated message */ | |
295 | return -EBADMSG; | |
296 | ||
297 | *ret = NDISC_ROUTER_OPTION_TYPE(rt); | |
298 | return 0; | |
299 | } | |
300 | ||
ea0999c9 | 301 | int sd_ndisc_router_option_is_type(sd_ndisc_router *rt, uint8_t type) { |
5a920b42 MP |
302 | uint8_t k; |
303 | int r; | |
304 | ||
305 | assert_return(rt, -EINVAL); | |
306 | ||
307 | r = sd_ndisc_router_option_get_type(rt, &k); | |
308 | if (r < 0) | |
309 | return r; | |
310 | ||
311 | return type == k; | |
312 | } | |
313 | ||
ea0999c9 | 314 | int sd_ndisc_router_option_get_raw(sd_ndisc_router *rt, const void **ret, size_t *size) { |
5a920b42 MP |
315 | size_t length; |
316 | ||
317 | assert_return(rt, -EINVAL); | |
318 | assert_return(ret, -EINVAL); | |
319 | assert_return(size, -EINVAL); | |
320 | ||
321 | /* Note that this returns the full option, including the option header */ | |
322 | ||
323 | if (rt->rindex + 2 > rt->raw_size) | |
324 | return -EBADMSG; | |
325 | ||
326 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
327 | if (rt->rindex + length > rt->raw_size) | |
328 | return -EBADMSG; | |
329 | ||
330 | *ret = (uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex; | |
331 | *size = length; | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static int get_prefix_info(sd_ndisc_router *rt, struct nd_opt_prefix_info **ret) { | |
337 | struct nd_opt_prefix_info *ri; | |
338 | size_t length; | |
339 | int r; | |
340 | ||
341 | assert(rt); | |
342 | assert(ret); | |
343 | ||
344 | r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_PREFIX_INFORMATION); | |
345 | if (r < 0) | |
346 | return r; | |
347 | if (r == 0) | |
348 | return -EMEDIUMTYPE; | |
349 | ||
350 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
351 | if (length != sizeof(struct nd_opt_prefix_info)) | |
352 | return -EBADMSG; | |
353 | ||
354 | ri = (struct nd_opt_prefix_info*) ((uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex); | |
355 | if (ri->nd_opt_pi_prefix_len > 128) | |
356 | return -EBADMSG; | |
357 | ||
358 | *ret = ri; | |
359 | return 0; | |
360 | } | |
361 | ||
ea0999c9 | 362 | int sd_ndisc_router_prefix_get_valid_lifetime(sd_ndisc_router *rt, uint32_t *ret) { |
5a920b42 MP |
363 | struct nd_opt_prefix_info *ri; |
364 | int r; | |
365 | ||
366 | assert_return(rt, -EINVAL); | |
367 | assert_return(ret, -EINVAL); | |
368 | ||
369 | r = get_prefix_info(rt, &ri); | |
370 | if (r < 0) | |
371 | return r; | |
372 | ||
373 | *ret = be32toh(ri->nd_opt_pi_valid_time); | |
374 | return 0; | |
375 | } | |
376 | ||
ea0999c9 | 377 | int sd_ndisc_router_prefix_get_preferred_lifetime(sd_ndisc_router *rt, uint32_t *ret) { |
5a920b42 MP |
378 | struct nd_opt_prefix_info *pi; |
379 | int r; | |
380 | ||
381 | assert_return(rt, -EINVAL); | |
382 | assert_return(ret, -EINVAL); | |
383 | ||
384 | r = get_prefix_info(rt, &pi); | |
385 | if (r < 0) | |
386 | return r; | |
387 | ||
388 | *ret = be32toh(pi->nd_opt_pi_preferred_time); | |
389 | return 0; | |
390 | } | |
391 | ||
ea0999c9 | 392 | int sd_ndisc_router_prefix_get_flags(sd_ndisc_router *rt, uint8_t *ret) { |
5a920b42 | 393 | struct nd_opt_prefix_info *pi; |
2897b343 | 394 | uint8_t flags; |
5a920b42 MP |
395 | int r; |
396 | ||
397 | assert_return(rt, -EINVAL); | |
398 | assert_return(ret, -EINVAL); | |
399 | ||
400 | r = get_prefix_info(rt, &pi); | |
401 | if (r < 0) | |
402 | return r; | |
403 | ||
2897b343 MP |
404 | flags = pi->nd_opt_pi_flags_reserved; |
405 | ||
406 | if ((flags & ND_OPT_PI_FLAG_AUTO) && (pi->nd_opt_pi_prefix_len != 64)) { | |
8b3d4ff0 | 407 | log_ndisc(NULL, "Invalid prefix length, ignoring prefix for stateless autoconfiguration."); |
2897b343 MP |
408 | flags &= ~ND_OPT_PI_FLAG_AUTO; |
409 | } | |
410 | ||
411 | *ret = flags; | |
5a920b42 MP |
412 | return 0; |
413 | } | |
414 | ||
ea0999c9 | 415 | int sd_ndisc_router_prefix_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr) { |
5a920b42 MP |
416 | struct nd_opt_prefix_info *pi; |
417 | int r; | |
418 | ||
419 | assert_return(rt, -EINVAL); | |
420 | assert_return(ret_addr, -EINVAL); | |
421 | ||
422 | r = get_prefix_info(rt, &pi); | |
423 | if (r < 0) | |
424 | return r; | |
425 | ||
426 | *ret_addr = pi->nd_opt_pi_prefix; | |
427 | return 0; | |
428 | } | |
429 | ||
ea0999c9 | 430 | int sd_ndisc_router_prefix_get_prefixlen(sd_ndisc_router *rt, unsigned *ret) { |
5a920b42 MP |
431 | struct nd_opt_prefix_info *pi; |
432 | int r; | |
433 | ||
434 | assert_return(rt, -EINVAL); | |
435 | assert_return(ret, -EINVAL); | |
436 | ||
437 | r = get_prefix_info(rt, &pi); | |
438 | if (r < 0) | |
439 | return r; | |
440 | ||
441 | if (pi->nd_opt_pi_prefix_len > 128) | |
442 | return -EBADMSG; | |
443 | ||
444 | *ret = pi->nd_opt_pi_prefix_len; | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static int get_route_info(sd_ndisc_router *rt, uint8_t **ret) { | |
449 | uint8_t *ri; | |
450 | size_t length; | |
451 | int r; | |
452 | ||
453 | assert(rt); | |
454 | assert(ret); | |
455 | ||
456 | r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_ROUTE_INFORMATION); | |
457 | if (r < 0) | |
458 | return r; | |
459 | if (r == 0) | |
460 | return -EMEDIUMTYPE; | |
461 | ||
462 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
463 | if (length < 1*8 || length > 3*8) | |
464 | return -EBADMSG; | |
465 | ||
466 | ri = (uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex; | |
467 | ||
468 | if (ri[2] > 128) | |
469 | return -EBADMSG; | |
470 | ||
471 | *ret = ri; | |
472 | return 0; | |
473 | } | |
474 | ||
ea0999c9 | 475 | int sd_ndisc_router_route_get_lifetime(sd_ndisc_router *rt, uint32_t *ret) { |
5a920b42 MP |
476 | uint8_t *ri; |
477 | int r; | |
478 | ||
479 | assert_return(rt, -EINVAL); | |
480 | assert_return(ret, -EINVAL); | |
481 | ||
482 | r = get_route_info(rt, &ri); | |
483 | if (r < 0) | |
484 | return r; | |
485 | ||
486 | *ret = be32toh(*(uint32_t*) (ri + 4)); | |
487 | return 0; | |
488 | } | |
489 | ||
ea0999c9 | 490 | int sd_ndisc_router_route_get_address(sd_ndisc_router *rt, struct in6_addr *ret_addr) { |
5a920b42 MP |
491 | uint8_t *ri; |
492 | int r; | |
493 | ||
494 | assert_return(rt, -EINVAL); | |
495 | assert_return(ret_addr, -EINVAL); | |
496 | ||
497 | r = get_route_info(rt, &ri); | |
498 | if (r < 0) | |
499 | return r; | |
500 | ||
501 | zero(*ret_addr); | |
502 | memcpy(ret_addr, ri + 8, NDISC_ROUTER_OPTION_LENGTH(rt) - 8); | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
ea0999c9 | 507 | int sd_ndisc_router_route_get_prefixlen(sd_ndisc_router *rt, unsigned *ret) { |
5a920b42 MP |
508 | uint8_t *ri; |
509 | int r; | |
510 | ||
511 | assert_return(rt, -EINVAL); | |
512 | assert_return(ret, -EINVAL); | |
513 | ||
514 | r = get_route_info(rt, &ri); | |
515 | if (r < 0) | |
516 | return r; | |
517 | ||
518 | *ret = ri[2]; | |
519 | return 0; | |
520 | } | |
521 | ||
ea0999c9 | 522 | int sd_ndisc_router_route_get_preference(sd_ndisc_router *rt, unsigned *ret) { |
5a920b42 MP |
523 | uint8_t *ri; |
524 | int r; | |
525 | ||
526 | assert_return(rt, -EINVAL); | |
527 | assert_return(ret, -EINVAL); | |
528 | ||
529 | r = get_route_info(rt, &ri); | |
530 | if (r < 0) | |
531 | return r; | |
532 | ||
533 | *ret = (ri[3] >> 3) & 3; | |
534 | if (!IN_SET(*ret, SD_NDISC_PREFERENCE_LOW, SD_NDISC_PREFERENCE_HIGH)) | |
535 | *ret = SD_NDISC_PREFERENCE_MEDIUM; | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | static int get_rdnss_info(sd_ndisc_router *rt, uint8_t **ret) { | |
541 | size_t length; | |
542 | int r; | |
543 | ||
544 | assert(rt); | |
545 | assert(ret); | |
546 | ||
547 | r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_RDNSS); | |
548 | if (r < 0) | |
549 | return r; | |
550 | if (r == 0) | |
551 | return -EMEDIUMTYPE; | |
552 | ||
553 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
554 | if (length < 3*8 || (length % (2*8)) != 1*8) | |
555 | return -EBADMSG; | |
556 | ||
557 | *ret = (uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex; | |
558 | return 0; | |
559 | } | |
560 | ||
ea0999c9 | 561 | int sd_ndisc_router_rdnss_get_addresses(sd_ndisc_router *rt, const struct in6_addr **ret) { |
5a920b42 MP |
562 | uint8_t *ri; |
563 | int r; | |
564 | ||
565 | assert_return(rt, -EINVAL); | |
566 | assert_return(ret, -EINVAL); | |
567 | ||
568 | r = get_rdnss_info(rt, &ri); | |
569 | if (r < 0) | |
570 | return r; | |
571 | ||
572 | *ret = (const struct in6_addr*) (ri + 8); | |
573 | return (NDISC_ROUTER_OPTION_LENGTH(rt) - 8) / 16; | |
574 | } | |
575 | ||
ea0999c9 | 576 | int sd_ndisc_router_rdnss_get_lifetime(sd_ndisc_router *rt, uint32_t *ret) { |
5a920b42 MP |
577 | uint8_t *ri; |
578 | int r; | |
579 | ||
580 | assert_return(rt, -EINVAL); | |
581 | assert_return(ret, -EINVAL); | |
582 | ||
583 | r = get_rdnss_info(rt, &ri); | |
584 | if (r < 0) | |
585 | return r; | |
586 | ||
587 | *ret = be32toh(*(uint32_t*) (ri + 4)); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static int get_dnssl_info(sd_ndisc_router *rt, uint8_t **ret) { | |
592 | size_t length; | |
593 | int r; | |
594 | ||
595 | assert(rt); | |
596 | assert(ret); | |
597 | ||
598 | r = sd_ndisc_router_option_is_type(rt, SD_NDISC_OPTION_DNSSL); | |
599 | if (r < 0) | |
600 | return r; | |
601 | if (r == 0) | |
602 | return -EMEDIUMTYPE; | |
603 | ||
604 | length = NDISC_ROUTER_OPTION_LENGTH(rt); | |
605 | if (length < 2*8) | |
606 | return -EBADMSG; | |
607 | ||
608 | *ret = (uint8_t*) NDISC_ROUTER_RAW(rt) + rt->rindex; | |
609 | return 0; | |
610 | } | |
611 | ||
ea0999c9 | 612 | int sd_ndisc_router_dnssl_get_domains(sd_ndisc_router *rt, char ***ret) { |
5a920b42 MP |
613 | _cleanup_strv_free_ char **l = NULL; |
614 | _cleanup_free_ char *e = NULL; | |
8b3d4ff0 | 615 | size_t n = 0, left; |
5a920b42 MP |
616 | uint8_t *ri, *p; |
617 | bool first = true; | |
618 | int r; | |
619 | unsigned k = 0; | |
620 | ||
621 | assert_return(rt, -EINVAL); | |
622 | assert_return(ret, -EINVAL); | |
623 | ||
624 | r = get_dnssl_info(rt, &ri); | |
625 | if (r < 0) | |
626 | return r; | |
627 | ||
628 | p = ri + 8; | |
629 | left = NDISC_ROUTER_OPTION_LENGTH(rt) - 8; | |
630 | ||
631 | for (;;) { | |
632 | if (left == 0) { | |
633 | ||
634 | if (n > 0) /* Not properly NUL terminated */ | |
635 | return -EBADMSG; | |
636 | ||
637 | break; | |
638 | } | |
639 | ||
640 | if (*p == 0) { | |
641 | /* Found NUL termination */ | |
642 | ||
643 | if (n > 0) { | |
644 | _cleanup_free_ char *normalized = NULL; | |
645 | ||
646 | e[n] = 0; | |
6e866b33 | 647 | r = dns_name_normalize(e, 0, &normalized); |
5a920b42 MP |
648 | if (r < 0) |
649 | return r; | |
650 | ||
651 | /* Ignore the root domain name or "localhost" and friends */ | |
652 | if (!is_localhost(normalized) && | |
653 | !dns_name_is_root(normalized)) { | |
654 | ||
655 | if (strv_push(&l, normalized) < 0) | |
656 | return -ENOMEM; | |
657 | ||
658 | normalized = NULL; | |
659 | k++; | |
660 | } | |
661 | } | |
662 | ||
663 | n = 0; | |
664 | first = true; | |
665 | p++, left--; | |
666 | continue; | |
667 | } | |
668 | ||
669 | /* Check for compression (which is not allowed) */ | |
670 | if (*p > 63) | |
671 | return -EBADMSG; | |
672 | ||
673 | if (1U + *p + 1U > left) | |
674 | return -EBADMSG; | |
675 | ||
8b3d4ff0 | 676 | if (!GREEDY_REALLOC(e, n + !first + DNS_LABEL_ESCAPED_MAX + 1U)) |
5a920b42 MP |
677 | return -ENOMEM; |
678 | ||
679 | if (first) | |
680 | first = false; | |
681 | else | |
682 | e[n++] = '.'; | |
683 | ||
684 | r = dns_label_escape((char*) p+1, *p, e + n, DNS_LABEL_ESCAPED_MAX); | |
685 | if (r < 0) | |
686 | return r; | |
687 | ||
688 | n += r; | |
689 | ||
690 | left -= 1 + *p; | |
691 | p += 1 + *p; | |
692 | } | |
693 | ||
694 | if (strv_isempty(l)) { | |
695 | *ret = NULL; | |
696 | return 0; | |
697 | } | |
698 | ||
b012e921 | 699 | *ret = TAKE_PTR(l); |
5a920b42 MP |
700 | |
701 | return k; | |
702 | } | |
703 | ||
ea0999c9 | 704 | int sd_ndisc_router_dnssl_get_lifetime(sd_ndisc_router *rt, uint32_t *ret_sec) { |
5a920b42 MP |
705 | uint8_t *ri; |
706 | int r; | |
707 | ||
708 | assert_return(rt, -EINVAL); | |
709 | assert_return(ret_sec, -EINVAL); | |
710 | ||
711 | r = get_dnssl_info(rt, &ri); | |
712 | if (r < 0) | |
713 | return r; | |
714 | ||
715 | *ret_sec = be32toh(*(uint32_t*) (ri + 4)); | |
716 | return 0; | |
717 | } |