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f12ed3bf PF |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
b553817c | 6 | Copyright (C) 2014-2015 Intel Corporation. All rights reserved. |
f12ed3bf PF |
7 | |
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
f12ed3bf | 22 | #include <errno.h> |
cf0fbc49 | 23 | #include <netinet/in.h> |
f12ed3bf PF |
24 | #include <string.h> |
25 | ||
2c1ab8ca BG |
26 | #include "sd-dhcp6-client.h" |
27 | ||
b5efdb8a | 28 | #include "alloc-util.h" |
f12ed3bf PF |
29 | #include "dhcp6-internal.h" |
30 | #include "dhcp6-protocol.h" | |
f96ccab7 | 31 | #include "dns-domain.h" |
b5efdb8a LP |
32 | #include "sparse-endian.h" |
33 | #include "strv.h" | |
34 | #include "unaligned.h" | |
35 | #include "util.h" | |
f12ed3bf | 36 | |
f12ed3bf PF |
37 | #define DHCP6_OPTION_IA_NA_LEN 12 |
38 | #define DHCP6_OPTION_IA_TA_LEN 4 | |
f12ed3bf | 39 | |
4903a73c TG |
40 | typedef struct DHCP6Option { |
41 | be16_t code; | |
42 | be16_t len; | |
43 | uint8_t data[]; | |
c962cb68 | 44 | } _packed_ DHCP6Option; |
4903a73c | 45 | |
f12ed3bf PF |
46 | static int option_append_hdr(uint8_t **buf, size_t *buflen, uint16_t optcode, |
47 | size_t optlen) { | |
c962cb68 | 48 | DHCP6Option *option = (DHCP6Option*) *buf; |
4903a73c | 49 | |
f12ed3bf PF |
50 | assert_return(buf, -EINVAL); |
51 | assert_return(*buf, -EINVAL); | |
52 | assert_return(buflen, -EINVAL); | |
53 | ||
4903a73c | 54 | if (optlen > 0xffff || *buflen < optlen + sizeof(DHCP6Option)) |
f12ed3bf PF |
55 | return -ENOBUFS; |
56 | ||
c962cb68 TG |
57 | option->code = htobe16(optcode); |
58 | option->len = htobe16(optlen); | |
f12ed3bf | 59 | |
4903a73c TG |
60 | *buf += sizeof(DHCP6Option); |
61 | *buflen -= sizeof(DHCP6Option); | |
f12ed3bf PF |
62 | |
63 | return 0; | |
64 | } | |
65 | ||
66 | int dhcp6_option_append(uint8_t **buf, size_t *buflen, uint16_t code, | |
67 | size_t optlen, const void *optval) { | |
68 | int r; | |
69 | ||
ed6ee219 | 70 | assert_return(optval || optlen == 0, -EINVAL); |
f12ed3bf PF |
71 | |
72 | r = option_append_hdr(buf, buflen, code, optlen); | |
73 | if (r < 0) | |
74 | return r; | |
75 | ||
75f32f04 | 76 | memcpy_safe(*buf, optval, optlen); |
f12ed3bf PF |
77 | |
78 | *buf += optlen; | |
79 | *buflen -= optlen; | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | int dhcp6_option_append_ia(uint8_t **buf, size_t *buflen, DHCP6IA *ia) { | |
85 | uint16_t len; | |
86 | uint8_t *ia_hdr; | |
87 | size_t ia_buflen, ia_addrlen = 0; | |
88 | DHCP6Address *addr; | |
89 | int r; | |
90 | ||
91 | assert_return(buf && *buf && buflen && ia, -EINVAL); | |
92 | ||
93 | switch (ia->type) { | |
2c1ab8ca | 94 | case SD_DHCP6_OPTION_IA_NA: |
f12ed3bf PF |
95 | len = DHCP6_OPTION_IA_NA_LEN; |
96 | break; | |
97 | ||
2c1ab8ca | 98 | case SD_DHCP6_OPTION_IA_TA: |
f12ed3bf PF |
99 | len = DHCP6_OPTION_IA_TA_LEN; |
100 | break; | |
101 | ||
102 | default: | |
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | if (*buflen < len) | |
107 | return -ENOBUFS; | |
108 | ||
109 | ia_hdr = *buf; | |
110 | ia_buflen = *buflen; | |
111 | ||
4903a73c TG |
112 | *buf += sizeof(DHCP6Option); |
113 | *buflen -= sizeof(DHCP6Option); | |
f12ed3bf PF |
114 | |
115 | memcpy(*buf, &ia->id, len); | |
116 | ||
117 | *buf += len; | |
118 | *buflen -= len; | |
119 | ||
120 | LIST_FOREACH(addresses, addr, ia->addresses) { | |
2c1ab8ca | 121 | r = option_append_hdr(buf, buflen, SD_DHCP6_OPTION_IAADDR, |
ee3a5027 | 122 | sizeof(addr->iaaddr)); |
f12ed3bf PF |
123 | if (r < 0) |
124 | return r; | |
125 | ||
ee3a5027 | 126 | memcpy(*buf, &addr->iaaddr, sizeof(addr->iaaddr)); |
f12ed3bf | 127 | |
ee3a5027 PF |
128 | *buf += sizeof(addr->iaaddr); |
129 | *buflen -= sizeof(addr->iaaddr); | |
f12ed3bf | 130 | |
4903a73c | 131 | ia_addrlen += sizeof(DHCP6Option) + sizeof(addr->iaaddr); |
f12ed3bf PF |
132 | } |
133 | ||
134 | r = option_append_hdr(&ia_hdr, &ia_buflen, ia->type, len + ia_addrlen); | |
135 | if (r < 0) | |
136 | return r; | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
c6affce8 | 141 | |
c962cb68 TG |
142 | static int option_parse_hdr(uint8_t **buf, size_t *buflen, uint16_t *optcode, size_t *optlen) { |
143 | DHCP6Option *option = (DHCP6Option*) *buf; | |
c6affce8 PF |
144 | uint16_t len; |
145 | ||
146 | assert_return(buf, -EINVAL); | |
4903a73c | 147 | assert_return(optcode, -EINVAL); |
c6affce8 PF |
148 | assert_return(optlen, -EINVAL); |
149 | ||
4903a73c | 150 | if (*buflen < sizeof(DHCP6Option)) |
c6affce8 PF |
151 | return -ENOMSG; |
152 | ||
c962cb68 | 153 | len = be16toh(option->len); |
c6affce8 PF |
154 | |
155 | if (len > *buflen) | |
156 | return -ENOMSG; | |
157 | ||
c962cb68 | 158 | *optcode = be16toh(option->code); |
c6affce8 PF |
159 | *optlen = len; |
160 | ||
161 | *buf += 4; | |
162 | *buflen -= 4; | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
f12ed3bf PF |
167 | int dhcp6_option_parse(uint8_t **buf, size_t *buflen, uint16_t *optcode, |
168 | size_t *optlen, uint8_t **optvalue) { | |
c6affce8 | 169 | int r; |
f12ed3bf | 170 | |
c6affce8 | 171 | assert_return(buf && buflen && optcode && optlen && optvalue, -EINVAL); |
f12ed3bf | 172 | |
c6affce8 PF |
173 | r = option_parse_hdr(buf, buflen, optcode, optlen); |
174 | if (r < 0) | |
175 | return r; | |
f12ed3bf | 176 | |
c6affce8 | 177 | if (*optlen > *buflen) |
f12ed3bf PF |
178 | return -ENOBUFS; |
179 | ||
c6affce8 PF |
180 | *optvalue = *buf; |
181 | *buflen -= *optlen; | |
182 | *buf += *optlen; | |
f12ed3bf PF |
183 | |
184 | return 0; | |
185 | } | |
c6affce8 PF |
186 | |
187 | int dhcp6_option_parse_ia(uint8_t **buf, size_t *buflen, uint16_t iatype, | |
188 | DHCP6IA *ia) { | |
189 | int r; | |
190 | uint16_t opt, status; | |
191 | size_t optlen; | |
192 | size_t iaaddr_offset; | |
193 | DHCP6Address *addr; | |
194 | uint32_t lt_t1, lt_t2, lt_valid, lt_pref, lt_min = ~0; | |
195 | ||
196 | assert_return(ia, -EINVAL); | |
197 | assert_return(!ia->addresses, -EINVAL); | |
198 | ||
199 | switch (iatype) { | |
2c1ab8ca | 200 | case SD_DHCP6_OPTION_IA_NA: |
c6affce8 | 201 | |
4903a73c | 202 | if (*buflen < DHCP6_OPTION_IA_NA_LEN + sizeof(DHCP6Option) + |
ee3a5027 | 203 | sizeof(addr->iaaddr)) { |
c6affce8 PF |
204 | r = -ENOBUFS; |
205 | goto error; | |
206 | } | |
207 | ||
208 | iaaddr_offset = DHCP6_OPTION_IA_NA_LEN; | |
209 | memcpy(&ia->id, *buf, iaaddr_offset); | |
210 | ||
211 | lt_t1 = be32toh(ia->lifetime_t1); | |
212 | lt_t2 = be32toh(ia->lifetime_t2); | |
213 | ||
214 | if (lt_t1 && lt_t2 && lt_t1 > lt_t2) { | |
215 | log_dhcp6_client(client, "IA T1 %ds > T2 %ds", | |
216 | lt_t1, lt_t2); | |
217 | r = -EINVAL; | |
218 | goto error; | |
219 | } | |
220 | ||
221 | break; | |
222 | ||
2c1ab8ca | 223 | case SD_DHCP6_OPTION_IA_TA: |
4903a73c | 224 | if (*buflen < DHCP6_OPTION_IA_TA_LEN + sizeof(DHCP6Option) + |
ee3a5027 | 225 | sizeof(addr->iaaddr)) { |
c6affce8 PF |
226 | r = -ENOBUFS; |
227 | goto error; | |
228 | } | |
229 | ||
230 | iaaddr_offset = DHCP6_OPTION_IA_TA_LEN; | |
231 | memcpy(&ia->id, *buf, iaaddr_offset); | |
232 | ||
233 | ia->lifetime_t1 = 0; | |
234 | ia->lifetime_t2 = 0; | |
235 | ||
236 | break; | |
237 | ||
238 | default: | |
239 | r = -ENOMSG; | |
240 | goto error; | |
241 | } | |
242 | ||
243 | ia->type = iatype; | |
244 | ||
245 | *buflen -= iaaddr_offset; | |
246 | *buf += iaaddr_offset; | |
247 | ||
248 | while ((r = option_parse_hdr(buf, buflen, &opt, &optlen)) >= 0) { | |
249 | ||
250 | switch (opt) { | |
2c1ab8ca | 251 | case SD_DHCP6_OPTION_IAADDR: |
c6affce8 PF |
252 | |
253 | addr = new0(DHCP6Address, 1); | |
254 | if (!addr) { | |
255 | r = -ENOMEM; | |
256 | goto error; | |
257 | } | |
258 | ||
259 | LIST_INIT(addresses, addr); | |
260 | ||
ee3a5027 | 261 | memcpy(&addr->iaaddr, *buf, sizeof(addr->iaaddr)); |
c6affce8 | 262 | |
ee3a5027 PF |
263 | lt_valid = be32toh(addr->iaaddr.lifetime_valid); |
264 | lt_pref = be32toh(addr->iaaddr.lifetime_valid); | |
c6affce8 PF |
265 | |
266 | if (!lt_valid || lt_pref > lt_valid) { | |
267 | log_dhcp6_client(client, "IA preferred %ds > valid %ds", | |
268 | lt_pref, lt_valid); | |
269 | free(addr); | |
270 | } else { | |
271 | LIST_PREPEND(addresses, ia->addresses, addr); | |
272 | if (lt_valid < lt_min) | |
273 | lt_min = lt_valid; | |
274 | } | |
275 | ||
276 | break; | |
277 | ||
2c1ab8ca | 278 | case SD_DHCP6_OPTION_STATUS_CODE: |
c6affce8 PF |
279 | if (optlen < sizeof(status)) |
280 | break; | |
281 | ||
282 | status = (*buf)[0] << 8 | (*buf)[1]; | |
283 | if (status) { | |
284 | log_dhcp6_client(client, "IA status %d", | |
285 | status); | |
286 | r = -EINVAL; | |
287 | goto error; | |
288 | } | |
289 | ||
290 | break; | |
291 | ||
292 | default: | |
293 | log_dhcp6_client(client, "Unknown IA option %d", opt); | |
294 | break; | |
295 | } | |
296 | ||
297 | *buflen -= optlen; | |
298 | *buf += optlen; | |
299 | } | |
300 | ||
301 | if (r == -ENOMSG) | |
302 | r = 0; | |
303 | ||
304 | if (!ia->lifetime_t1 && !ia->lifetime_t2) { | |
305 | lt_t1 = lt_min / 2; | |
306 | lt_t2 = lt_min / 10 * 8; | |
307 | ia->lifetime_t1 = htobe32(lt_t1); | |
308 | ia->lifetime_t2 = htobe32(lt_t2); | |
309 | ||
310 | log_dhcp6_client(client, "Computed IA T1 %ds and T2 %ds as both were zero", | |
311 | lt_t1, lt_t2); | |
312 | } | |
313 | ||
314 | if (*buflen) | |
315 | r = -ENOMSG; | |
316 | ||
317 | error: | |
318 | *buf += *buflen; | |
319 | *buflen = 0; | |
320 | ||
321 | return r; | |
322 | } | |
b553817c PF |
323 | |
324 | int dhcp6_option_parse_ip6addrs(uint8_t *optval, uint16_t optlen, | |
325 | struct in6_addr **addrs, size_t count, | |
326 | size_t *allocated) { | |
327 | ||
328 | if (optlen == 0 || optlen % sizeof(struct in6_addr) != 0) | |
329 | return -EINVAL; | |
330 | ||
331 | if (!GREEDY_REALLOC(*addrs, *allocated, | |
332 | count * sizeof(struct in6_addr) + optlen)) | |
333 | return -ENOMEM; | |
334 | ||
335 | memcpy(*addrs + count, optval, optlen); | |
336 | ||
337 | count += optlen / sizeof(struct in6_addr); | |
338 | ||
339 | return count; | |
340 | } | |
f96ccab7 | 341 | |
52efd56a | 342 | int dhcp6_option_parse_domainname(const uint8_t *optval, uint16_t optlen, char ***str_arr) { |
f96ccab7 PF |
343 | size_t pos = 0, idx = 0; |
344 | _cleanup_free_ char **names = NULL; | |
345 | int r; | |
346 | ||
347 | assert_return(optlen > 1, -ENODATA); | |
93f660da | 348 | assert_return(optval[optlen - 1] == '\0', -EINVAL); |
f96ccab7 PF |
349 | |
350 | while (pos < optlen) { | |
351 | _cleanup_free_ char *ret = NULL; | |
352 | size_t n = 0, allocated = 0; | |
353 | bool first = true; | |
354 | ||
355 | for (;;) { | |
356 | uint8_t c; | |
357 | ||
358 | c = optval[pos++]; | |
359 | ||
360 | if (c == 0) | |
361 | /* End of name */ | |
362 | break; | |
363 | else if (c <= 63) { | |
f96ccab7 PF |
364 | const char *label; |
365 | ||
366 | /* Literal label */ | |
367 | label = (const char *)&optval[pos]; | |
368 | pos += c; | |
369 | if (pos > optlen) | |
370 | return -EMSGSIZE; | |
371 | ||
422baca0 | 372 | if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX)) { |
f96ccab7 PF |
373 | r = -ENOMEM; |
374 | goto fail; | |
375 | } | |
376 | ||
422baca0 | 377 | if (first) |
f96ccab7 | 378 | first = false; |
422baca0 LP |
379 | else |
380 | ret[n++] = '.'; | |
381 | ||
382 | r = dns_label_escape(label, c, ret + n, DNS_LABEL_ESCAPED_MAX); | |
383 | if (r < 0) | |
384 | goto fail; | |
f96ccab7 | 385 | |
f96ccab7 PF |
386 | n += r; |
387 | continue; | |
388 | } else { | |
389 | r = -EBADMSG; | |
390 | goto fail; | |
391 | } | |
392 | } | |
393 | ||
394 | if (!GREEDY_REALLOC(ret, allocated, n + 1)) { | |
395 | r = -ENOMEM; | |
396 | goto fail; | |
397 | } | |
398 | ||
399 | ret[n] = 0; | |
400 | ||
401 | r = strv_extend(&names, ret); | |
402 | if (r < 0) | |
403 | goto fail; | |
404 | ||
f96ccab7 PF |
405 | idx++; |
406 | } | |
407 | ||
408 | *str_arr = names; | |
409 | names = NULL; | |
410 | ||
411 | return idx; | |
412 | ||
413 | fail: | |
414 | return r; | |
415 | } |