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1 | /* xfrm_user.c: User interface to configure xfrm engine. | |
2 | * | |
3 | * Copyright (C) 2002 David S. Miller (davem@redhat.com) | |
4 | * | |
5 | * Changes: | |
6 | * Mitsuru KANDA @USAGI | |
7 | * Kazunori MIYAZAWA @USAGI | |
8 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
9 | * IPv6 support | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/crypto.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/socket.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/net.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/pfkeyv2.h> | |
23 | #include <linux/ipsec.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/security.h> | |
26 | #include <net/sock.h> | |
27 | #include <net/xfrm.h> | |
28 | #include <net/netlink.h> | |
29 | #include <net/ah.h> | |
30 | #include <linux/uaccess.h> | |
31 | #if IS_ENABLED(CONFIG_IPV6) | |
32 | #include <linux/in6.h> | |
33 | #endif | |
34 | #include <asm/unaligned.h> | |
35 | ||
36 | static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type) | |
37 | { | |
38 | struct nlattr *rt = attrs[type]; | |
39 | struct xfrm_algo *algp; | |
40 | ||
41 | if (!rt) | |
42 | return 0; | |
43 | ||
44 | algp = nla_data(rt); | |
45 | if (nla_len(rt) < xfrm_alg_len(algp)) | |
46 | return -EINVAL; | |
47 | ||
48 | switch (type) { | |
49 | case XFRMA_ALG_AUTH: | |
50 | case XFRMA_ALG_CRYPT: | |
51 | case XFRMA_ALG_COMP: | |
52 | break; | |
53 | ||
54 | default: | |
55 | return -EINVAL; | |
56 | } | |
57 | ||
58 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static int verify_auth_trunc(struct nlattr **attrs) | |
63 | { | |
64 | struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; | |
65 | struct xfrm_algo_auth *algp; | |
66 | ||
67 | if (!rt) | |
68 | return 0; | |
69 | ||
70 | algp = nla_data(rt); | |
71 | if (nla_len(rt) < xfrm_alg_auth_len(algp)) | |
72 | return -EINVAL; | |
73 | ||
74 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; | |
75 | return 0; | |
76 | } | |
77 | ||
78 | static int verify_aead(struct nlattr **attrs) | |
79 | { | |
80 | struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; | |
81 | struct xfrm_algo_aead *algp; | |
82 | ||
83 | if (!rt) | |
84 | return 0; | |
85 | ||
86 | algp = nla_data(rt); | |
87 | if (nla_len(rt) < aead_len(algp)) | |
88 | return -EINVAL; | |
89 | ||
90 | algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0'; | |
91 | return 0; | |
92 | } | |
93 | ||
94 | static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, | |
95 | xfrm_address_t **addrp) | |
96 | { | |
97 | struct nlattr *rt = attrs[type]; | |
98 | ||
99 | if (rt && addrp) | |
100 | *addrp = nla_data(rt); | |
101 | } | |
102 | ||
103 | static inline int verify_sec_ctx_len(struct nlattr **attrs) | |
104 | { | |
105 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; | |
106 | struct xfrm_user_sec_ctx *uctx; | |
107 | ||
108 | if (!rt) | |
109 | return 0; | |
110 | ||
111 | uctx = nla_data(rt); | |
112 | if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) | |
113 | return -EINVAL; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static inline int verify_replay(struct xfrm_usersa_info *p, | |
119 | struct nlattr **attrs) | |
120 | { | |
121 | struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; | |
122 | struct xfrm_replay_state_esn *rs; | |
123 | ||
124 | if (p->flags & XFRM_STATE_ESN) { | |
125 | if (!rt) | |
126 | return -EINVAL; | |
127 | ||
128 | rs = nla_data(rt); | |
129 | ||
130 | if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) | |
131 | return -EINVAL; | |
132 | ||
133 | if (nla_len(rt) < xfrm_replay_state_esn_len(rs) && | |
134 | nla_len(rt) != sizeof(*rs)) | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | if (!rt) | |
139 | return 0; | |
140 | ||
141 | /* As only ESP and AH support ESN feature. */ | |
142 | if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) | |
143 | return -EINVAL; | |
144 | ||
145 | if (p->replay_window != 0) | |
146 | return -EINVAL; | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int verify_newsa_info(struct xfrm_usersa_info *p, | |
152 | struct nlattr **attrs) | |
153 | { | |
154 | int err; | |
155 | ||
156 | err = -EINVAL; | |
157 | switch (p->family) { | |
158 | case AF_INET: | |
159 | break; | |
160 | ||
161 | case AF_INET6: | |
162 | #if IS_ENABLED(CONFIG_IPV6) | |
163 | break; | |
164 | #else | |
165 | err = -EAFNOSUPPORT; | |
166 | goto out; | |
167 | #endif | |
168 | ||
169 | default: | |
170 | goto out; | |
171 | } | |
172 | ||
173 | err = -EINVAL; | |
174 | switch (p->id.proto) { | |
175 | case IPPROTO_AH: | |
176 | if ((!attrs[XFRMA_ALG_AUTH] && | |
177 | !attrs[XFRMA_ALG_AUTH_TRUNC]) || | |
178 | attrs[XFRMA_ALG_AEAD] || | |
179 | attrs[XFRMA_ALG_CRYPT] || | |
180 | attrs[XFRMA_ALG_COMP] || | |
181 | attrs[XFRMA_TFCPAD]) | |
182 | goto out; | |
183 | break; | |
184 | ||
185 | case IPPROTO_ESP: | |
186 | if (attrs[XFRMA_ALG_COMP]) | |
187 | goto out; | |
188 | if (!attrs[XFRMA_ALG_AUTH] && | |
189 | !attrs[XFRMA_ALG_AUTH_TRUNC] && | |
190 | !attrs[XFRMA_ALG_CRYPT] && | |
191 | !attrs[XFRMA_ALG_AEAD]) | |
192 | goto out; | |
193 | if ((attrs[XFRMA_ALG_AUTH] || | |
194 | attrs[XFRMA_ALG_AUTH_TRUNC] || | |
195 | attrs[XFRMA_ALG_CRYPT]) && | |
196 | attrs[XFRMA_ALG_AEAD]) | |
197 | goto out; | |
198 | if (attrs[XFRMA_TFCPAD] && | |
199 | p->mode != XFRM_MODE_TUNNEL) | |
200 | goto out; | |
201 | break; | |
202 | ||
203 | case IPPROTO_COMP: | |
204 | if (!attrs[XFRMA_ALG_COMP] || | |
205 | attrs[XFRMA_ALG_AEAD] || | |
206 | attrs[XFRMA_ALG_AUTH] || | |
207 | attrs[XFRMA_ALG_AUTH_TRUNC] || | |
208 | attrs[XFRMA_ALG_CRYPT] || | |
209 | attrs[XFRMA_TFCPAD] || | |
210 | (ntohl(p->id.spi) >= 0x10000)) | |
211 | goto out; | |
212 | break; | |
213 | ||
214 | #if IS_ENABLED(CONFIG_IPV6) | |
215 | case IPPROTO_DSTOPTS: | |
216 | case IPPROTO_ROUTING: | |
217 | if (attrs[XFRMA_ALG_COMP] || | |
218 | attrs[XFRMA_ALG_AUTH] || | |
219 | attrs[XFRMA_ALG_AUTH_TRUNC] || | |
220 | attrs[XFRMA_ALG_AEAD] || | |
221 | attrs[XFRMA_ALG_CRYPT] || | |
222 | attrs[XFRMA_ENCAP] || | |
223 | attrs[XFRMA_SEC_CTX] || | |
224 | attrs[XFRMA_TFCPAD] || | |
225 | !attrs[XFRMA_COADDR]) | |
226 | goto out; | |
227 | break; | |
228 | #endif | |
229 | ||
230 | default: | |
231 | goto out; | |
232 | } | |
233 | ||
234 | if ((err = verify_aead(attrs))) | |
235 | goto out; | |
236 | if ((err = verify_auth_trunc(attrs))) | |
237 | goto out; | |
238 | if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH))) | |
239 | goto out; | |
240 | if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT))) | |
241 | goto out; | |
242 | if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP))) | |
243 | goto out; | |
244 | if ((err = verify_sec_ctx_len(attrs))) | |
245 | goto out; | |
246 | if ((err = verify_replay(p, attrs))) | |
247 | goto out; | |
248 | ||
249 | err = -EINVAL; | |
250 | switch (p->mode) { | |
251 | case XFRM_MODE_TRANSPORT: | |
252 | case XFRM_MODE_TUNNEL: | |
253 | case XFRM_MODE_ROUTEOPTIMIZATION: | |
254 | case XFRM_MODE_BEET: | |
255 | break; | |
256 | ||
257 | default: | |
258 | goto out; | |
259 | } | |
260 | ||
261 | err = 0; | |
262 | ||
263 | out: | |
264 | return err; | |
265 | } | |
266 | ||
267 | static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, | |
268 | struct xfrm_algo_desc *(*get_byname)(const char *, int), | |
269 | struct nlattr *rta) | |
270 | { | |
271 | struct xfrm_algo *p, *ualg; | |
272 | struct xfrm_algo_desc *algo; | |
273 | ||
274 | if (!rta) | |
275 | return 0; | |
276 | ||
277 | ualg = nla_data(rta); | |
278 | ||
279 | algo = get_byname(ualg->alg_name, 1); | |
280 | if (!algo) | |
281 | return -ENOSYS; | |
282 | *props = algo->desc.sadb_alg_id; | |
283 | ||
284 | p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); | |
285 | if (!p) | |
286 | return -ENOMEM; | |
287 | ||
288 | strcpy(p->alg_name, algo->name); | |
289 | *algpp = p; | |
290 | return 0; | |
291 | } | |
292 | ||
293 | static int attach_crypt(struct xfrm_state *x, struct nlattr *rta) | |
294 | { | |
295 | struct xfrm_algo *p, *ualg; | |
296 | struct xfrm_algo_desc *algo; | |
297 | ||
298 | if (!rta) | |
299 | return 0; | |
300 | ||
301 | ualg = nla_data(rta); | |
302 | ||
303 | algo = xfrm_ealg_get_byname(ualg->alg_name, 1); | |
304 | if (!algo) | |
305 | return -ENOSYS; | |
306 | x->props.ealgo = algo->desc.sadb_alg_id; | |
307 | ||
308 | p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); | |
309 | if (!p) | |
310 | return -ENOMEM; | |
311 | ||
312 | strcpy(p->alg_name, algo->name); | |
313 | x->ealg = p; | |
314 | x->geniv = algo->uinfo.encr.geniv; | |
315 | return 0; | |
316 | } | |
317 | ||
318 | static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, | |
319 | struct nlattr *rta) | |
320 | { | |
321 | struct xfrm_algo *ualg; | |
322 | struct xfrm_algo_auth *p; | |
323 | struct xfrm_algo_desc *algo; | |
324 | ||
325 | if (!rta) | |
326 | return 0; | |
327 | ||
328 | ualg = nla_data(rta); | |
329 | ||
330 | algo = xfrm_aalg_get_byname(ualg->alg_name, 1); | |
331 | if (!algo) | |
332 | return -ENOSYS; | |
333 | *props = algo->desc.sadb_alg_id; | |
334 | ||
335 | p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); | |
336 | if (!p) | |
337 | return -ENOMEM; | |
338 | ||
339 | strcpy(p->alg_name, algo->name); | |
340 | p->alg_key_len = ualg->alg_key_len; | |
341 | p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; | |
342 | memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); | |
343 | ||
344 | *algpp = p; | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, | |
349 | struct nlattr *rta) | |
350 | { | |
351 | struct xfrm_algo_auth *p, *ualg; | |
352 | struct xfrm_algo_desc *algo; | |
353 | ||
354 | if (!rta) | |
355 | return 0; | |
356 | ||
357 | ualg = nla_data(rta); | |
358 | ||
359 | algo = xfrm_aalg_get_byname(ualg->alg_name, 1); | |
360 | if (!algo) | |
361 | return -ENOSYS; | |
362 | if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) | |
363 | return -EINVAL; | |
364 | *props = algo->desc.sadb_alg_id; | |
365 | ||
366 | p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); | |
367 | if (!p) | |
368 | return -ENOMEM; | |
369 | ||
370 | strcpy(p->alg_name, algo->name); | |
371 | if (!p->alg_trunc_len) | |
372 | p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; | |
373 | ||
374 | *algpp = p; | |
375 | return 0; | |
376 | } | |
377 | ||
378 | static int attach_aead(struct xfrm_state *x, struct nlattr *rta) | |
379 | { | |
380 | struct xfrm_algo_aead *p, *ualg; | |
381 | struct xfrm_algo_desc *algo; | |
382 | ||
383 | if (!rta) | |
384 | return 0; | |
385 | ||
386 | ualg = nla_data(rta); | |
387 | ||
388 | algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); | |
389 | if (!algo) | |
390 | return -ENOSYS; | |
391 | x->props.ealgo = algo->desc.sadb_alg_id; | |
392 | ||
393 | p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); | |
394 | if (!p) | |
395 | return -ENOMEM; | |
396 | ||
397 | strcpy(p->alg_name, algo->name); | |
398 | x->aead = p; | |
399 | x->geniv = algo->uinfo.aead.geniv; | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, | |
404 | struct nlattr *rp) | |
405 | { | |
406 | struct xfrm_replay_state_esn *up; | |
407 | int ulen; | |
408 | ||
409 | if (!replay_esn || !rp) | |
410 | return 0; | |
411 | ||
412 | up = nla_data(rp); | |
413 | ulen = xfrm_replay_state_esn_len(up); | |
414 | ||
415 | /* Check the overall length and the internal bitmap length to avoid | |
416 | * potential overflow. */ | |
417 | if (nla_len(rp) < ulen || | |
418 | xfrm_replay_state_esn_len(replay_esn) != ulen || | |
419 | replay_esn->bmp_len != up->bmp_len) | |
420 | return -EINVAL; | |
421 | ||
422 | if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) | |
423 | return -EINVAL; | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, | |
429 | struct xfrm_replay_state_esn **preplay_esn, | |
430 | struct nlattr *rta) | |
431 | { | |
432 | struct xfrm_replay_state_esn *p, *pp, *up; | |
433 | int klen, ulen; | |
434 | ||
435 | if (!rta) | |
436 | return 0; | |
437 | ||
438 | up = nla_data(rta); | |
439 | klen = xfrm_replay_state_esn_len(up); | |
440 | ulen = nla_len(rta) >= klen ? klen : sizeof(*up); | |
441 | ||
442 | p = kzalloc(klen, GFP_KERNEL); | |
443 | if (!p) | |
444 | return -ENOMEM; | |
445 | ||
446 | pp = kzalloc(klen, GFP_KERNEL); | |
447 | if (!pp) { | |
448 | kfree(p); | |
449 | return -ENOMEM; | |
450 | } | |
451 | ||
452 | memcpy(p, up, ulen); | |
453 | memcpy(pp, up, ulen); | |
454 | ||
455 | *replay_esn = p; | |
456 | *preplay_esn = pp; | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) | |
462 | { | |
463 | int len = 0; | |
464 | ||
465 | if (xfrm_ctx) { | |
466 | len += sizeof(struct xfrm_user_sec_ctx); | |
467 | len += xfrm_ctx->ctx_len; | |
468 | } | |
469 | return len; | |
470 | } | |
471 | ||
472 | static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) | |
473 | { | |
474 | memcpy(&x->id, &p->id, sizeof(x->id)); | |
475 | memcpy(&x->sel, &p->sel, sizeof(x->sel)); | |
476 | memcpy(&x->lft, &p->lft, sizeof(x->lft)); | |
477 | x->props.mode = p->mode; | |
478 | x->props.replay_window = min_t(unsigned int, p->replay_window, | |
479 | sizeof(x->replay.bitmap) * 8); | |
480 | x->props.reqid = p->reqid; | |
481 | x->props.family = p->family; | |
482 | memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); | |
483 | x->props.flags = p->flags; | |
484 | ||
485 | if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) | |
486 | x->sel.family = p->family; | |
487 | } | |
488 | ||
489 | /* | |
490 | * someday when pfkey also has support, we could have the code | |
491 | * somehow made shareable and move it to xfrm_state.c - JHS | |
492 | * | |
493 | */ | |
494 | static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, | |
495 | int update_esn) | |
496 | { | |
497 | struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; | |
498 | struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; | |
499 | struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; | |
500 | struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; | |
501 | struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; | |
502 | ||
503 | if (re) { | |
504 | struct xfrm_replay_state_esn *replay_esn; | |
505 | replay_esn = nla_data(re); | |
506 | memcpy(x->replay_esn, replay_esn, | |
507 | xfrm_replay_state_esn_len(replay_esn)); | |
508 | memcpy(x->preplay_esn, replay_esn, | |
509 | xfrm_replay_state_esn_len(replay_esn)); | |
510 | } | |
511 | ||
512 | if (rp) { | |
513 | struct xfrm_replay_state *replay; | |
514 | replay = nla_data(rp); | |
515 | memcpy(&x->replay, replay, sizeof(*replay)); | |
516 | memcpy(&x->preplay, replay, sizeof(*replay)); | |
517 | } | |
518 | ||
519 | if (lt) { | |
520 | struct xfrm_lifetime_cur *ltime; | |
521 | ltime = nla_data(lt); | |
522 | x->curlft.bytes = ltime->bytes; | |
523 | x->curlft.packets = ltime->packets; | |
524 | x->curlft.add_time = ltime->add_time; | |
525 | x->curlft.use_time = ltime->use_time; | |
526 | } | |
527 | ||
528 | if (et) | |
529 | x->replay_maxage = nla_get_u32(et); | |
530 | ||
531 | if (rt) | |
532 | x->replay_maxdiff = nla_get_u32(rt); | |
533 | } | |
534 | ||
535 | static struct xfrm_state *xfrm_state_construct(struct net *net, | |
536 | struct xfrm_usersa_info *p, | |
537 | struct nlattr **attrs, | |
538 | int *errp) | |
539 | { | |
540 | struct xfrm_state *x = xfrm_state_alloc(net); | |
541 | int err = -ENOMEM; | |
542 | ||
543 | if (!x) | |
544 | goto error_no_put; | |
545 | ||
546 | copy_from_user_state(x, p); | |
547 | ||
548 | if (attrs[XFRMA_SA_EXTRA_FLAGS]) | |
549 | x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); | |
550 | ||
551 | if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD]))) | |
552 | goto error; | |
553 | if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, | |
554 | attrs[XFRMA_ALG_AUTH_TRUNC]))) | |
555 | goto error; | |
556 | if (!x->props.aalgo) { | |
557 | if ((err = attach_auth(&x->aalg, &x->props.aalgo, | |
558 | attrs[XFRMA_ALG_AUTH]))) | |
559 | goto error; | |
560 | } | |
561 | if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT]))) | |
562 | goto error; | |
563 | if ((err = attach_one_algo(&x->calg, &x->props.calgo, | |
564 | xfrm_calg_get_byname, | |
565 | attrs[XFRMA_ALG_COMP]))) | |
566 | goto error; | |
567 | ||
568 | if (attrs[XFRMA_ENCAP]) { | |
569 | x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), | |
570 | sizeof(*x->encap), GFP_KERNEL); | |
571 | if (x->encap == NULL) | |
572 | goto error; | |
573 | } | |
574 | ||
575 | if (attrs[XFRMA_TFCPAD]) | |
576 | x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); | |
577 | ||
578 | if (attrs[XFRMA_COADDR]) { | |
579 | x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), | |
580 | sizeof(*x->coaddr), GFP_KERNEL); | |
581 | if (x->coaddr == NULL) | |
582 | goto error; | |
583 | } | |
584 | ||
585 | xfrm_mark_get(attrs, &x->mark); | |
586 | ||
587 | err = __xfrm_init_state(x, false); | |
588 | if (err) | |
589 | goto error; | |
590 | ||
591 | if (attrs[XFRMA_SEC_CTX]) { | |
592 | err = security_xfrm_state_alloc(x, | |
593 | nla_data(attrs[XFRMA_SEC_CTX])); | |
594 | if (err) | |
595 | goto error; | |
596 | } | |
597 | ||
598 | if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, | |
599 | attrs[XFRMA_REPLAY_ESN_VAL]))) | |
600 | goto error; | |
601 | ||
602 | x->km.seq = p->seq; | |
603 | x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; | |
604 | /* sysctl_xfrm_aevent_etime is in 100ms units */ | |
605 | x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; | |
606 | ||
607 | if ((err = xfrm_init_replay(x))) | |
608 | goto error; | |
609 | ||
610 | /* override default values from above */ | |
611 | xfrm_update_ae_params(x, attrs, 0); | |
612 | ||
613 | return x; | |
614 | ||
615 | error: | |
616 | x->km.state = XFRM_STATE_DEAD; | |
617 | xfrm_state_put(x); | |
618 | error_no_put: | |
619 | *errp = err; | |
620 | return NULL; | |
621 | } | |
622 | ||
623 | static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, | |
624 | struct nlattr **attrs) | |
625 | { | |
626 | struct net *net = sock_net(skb->sk); | |
627 | struct xfrm_usersa_info *p = nlmsg_data(nlh); | |
628 | struct xfrm_state *x; | |
629 | int err; | |
630 | struct km_event c; | |
631 | ||
632 | err = verify_newsa_info(p, attrs); | |
633 | if (err) | |
634 | return err; | |
635 | ||
636 | x = xfrm_state_construct(net, p, attrs, &err); | |
637 | if (!x) | |
638 | return err; | |
639 | ||
640 | xfrm_state_hold(x); | |
641 | if (nlh->nlmsg_type == XFRM_MSG_NEWSA) | |
642 | err = xfrm_state_add(x); | |
643 | else | |
644 | err = xfrm_state_update(x); | |
645 | ||
646 | xfrm_audit_state_add(x, err ? 0 : 1, true); | |
647 | ||
648 | if (err < 0) { | |
649 | x->km.state = XFRM_STATE_DEAD; | |
650 | __xfrm_state_put(x); | |
651 | goto out; | |
652 | } | |
653 | ||
654 | c.seq = nlh->nlmsg_seq; | |
655 | c.portid = nlh->nlmsg_pid; | |
656 | c.event = nlh->nlmsg_type; | |
657 | ||
658 | km_state_notify(x, &c); | |
659 | out: | |
660 | xfrm_state_put(x); | |
661 | return err; | |
662 | } | |
663 | ||
664 | static struct xfrm_state *xfrm_user_state_lookup(struct net *net, | |
665 | struct xfrm_usersa_id *p, | |
666 | struct nlattr **attrs, | |
667 | int *errp) | |
668 | { | |
669 | struct xfrm_state *x = NULL; | |
670 | struct xfrm_mark m; | |
671 | int err; | |
672 | u32 mark = xfrm_mark_get(attrs, &m); | |
673 | ||
674 | if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { | |
675 | err = -ESRCH; | |
676 | x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); | |
677 | } else { | |
678 | xfrm_address_t *saddr = NULL; | |
679 | ||
680 | verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); | |
681 | if (!saddr) { | |
682 | err = -EINVAL; | |
683 | goto out; | |
684 | } | |
685 | ||
686 | err = -ESRCH; | |
687 | x = xfrm_state_lookup_byaddr(net, mark, | |
688 | &p->daddr, saddr, | |
689 | p->proto, p->family); | |
690 | } | |
691 | ||
692 | out: | |
693 | if (!x && errp) | |
694 | *errp = err; | |
695 | return x; | |
696 | } | |
697 | ||
698 | static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, | |
699 | struct nlattr **attrs) | |
700 | { | |
701 | struct net *net = sock_net(skb->sk); | |
702 | struct xfrm_state *x; | |
703 | int err = -ESRCH; | |
704 | struct km_event c; | |
705 | struct xfrm_usersa_id *p = nlmsg_data(nlh); | |
706 | ||
707 | x = xfrm_user_state_lookup(net, p, attrs, &err); | |
708 | if (x == NULL) | |
709 | return err; | |
710 | ||
711 | if ((err = security_xfrm_state_delete(x)) != 0) | |
712 | goto out; | |
713 | ||
714 | if (xfrm_state_kern(x)) { | |
715 | err = -EPERM; | |
716 | goto out; | |
717 | } | |
718 | ||
719 | err = xfrm_state_delete(x); | |
720 | ||
721 | if (err < 0) | |
722 | goto out; | |
723 | ||
724 | c.seq = nlh->nlmsg_seq; | |
725 | c.portid = nlh->nlmsg_pid; | |
726 | c.event = nlh->nlmsg_type; | |
727 | km_state_notify(x, &c); | |
728 | ||
729 | out: | |
730 | xfrm_audit_state_delete(x, err ? 0 : 1, true); | |
731 | xfrm_state_put(x); | |
732 | return err; | |
733 | } | |
734 | ||
735 | static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) | |
736 | { | |
737 | memset(p, 0, sizeof(*p)); | |
738 | memcpy(&p->id, &x->id, sizeof(p->id)); | |
739 | memcpy(&p->sel, &x->sel, sizeof(p->sel)); | |
740 | memcpy(&p->lft, &x->lft, sizeof(p->lft)); | |
741 | memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); | |
742 | put_unaligned(x->stats.replay_window, &p->stats.replay_window); | |
743 | put_unaligned(x->stats.replay, &p->stats.replay); | |
744 | put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); | |
745 | memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); | |
746 | p->mode = x->props.mode; | |
747 | p->replay_window = x->props.replay_window; | |
748 | p->reqid = x->props.reqid; | |
749 | p->family = x->props.family; | |
750 | p->flags = x->props.flags; | |
751 | p->seq = x->km.seq; | |
752 | } | |
753 | ||
754 | struct xfrm_dump_info { | |
755 | struct sk_buff *in_skb; | |
756 | struct sk_buff *out_skb; | |
757 | u32 nlmsg_seq; | |
758 | u16 nlmsg_flags; | |
759 | }; | |
760 | ||
761 | static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) | |
762 | { | |
763 | struct xfrm_user_sec_ctx *uctx; | |
764 | struct nlattr *attr; | |
765 | int ctx_size = sizeof(*uctx) + s->ctx_len; | |
766 | ||
767 | attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); | |
768 | if (attr == NULL) | |
769 | return -EMSGSIZE; | |
770 | ||
771 | uctx = nla_data(attr); | |
772 | uctx->exttype = XFRMA_SEC_CTX; | |
773 | uctx->len = ctx_size; | |
774 | uctx->ctx_doi = s->ctx_doi; | |
775 | uctx->ctx_alg = s->ctx_alg; | |
776 | uctx->ctx_len = s->ctx_len; | |
777 | memcpy(uctx + 1, s->ctx_str, s->ctx_len); | |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
782 | static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) | |
783 | { | |
784 | struct xfrm_algo *algo; | |
785 | struct nlattr *nla; | |
786 | ||
787 | nla = nla_reserve(skb, XFRMA_ALG_AUTH, | |
788 | sizeof(*algo) + (auth->alg_key_len + 7) / 8); | |
789 | if (!nla) | |
790 | return -EMSGSIZE; | |
791 | ||
792 | algo = nla_data(nla); | |
793 | strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); | |
794 | memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8); | |
795 | algo->alg_key_len = auth->alg_key_len; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | /* Don't change this without updating xfrm_sa_len! */ | |
801 | static int copy_to_user_state_extra(struct xfrm_state *x, | |
802 | struct xfrm_usersa_info *p, | |
803 | struct sk_buff *skb) | |
804 | { | |
805 | int ret = 0; | |
806 | ||
807 | copy_to_user_state(x, p); | |
808 | ||
809 | if (x->props.extra_flags) { | |
810 | ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, | |
811 | x->props.extra_flags); | |
812 | if (ret) | |
813 | goto out; | |
814 | } | |
815 | ||
816 | if (x->coaddr) { | |
817 | ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); | |
818 | if (ret) | |
819 | goto out; | |
820 | } | |
821 | if (x->lastused) { | |
822 | ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, | |
823 | XFRMA_PAD); | |
824 | if (ret) | |
825 | goto out; | |
826 | } | |
827 | if (x->aead) { | |
828 | ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead); | |
829 | if (ret) | |
830 | goto out; | |
831 | } | |
832 | if (x->aalg) { | |
833 | ret = copy_to_user_auth(x->aalg, skb); | |
834 | if (!ret) | |
835 | ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC, | |
836 | xfrm_alg_auth_len(x->aalg), x->aalg); | |
837 | if (ret) | |
838 | goto out; | |
839 | } | |
840 | if (x->ealg) { | |
841 | ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg); | |
842 | if (ret) | |
843 | goto out; | |
844 | } | |
845 | if (x->calg) { | |
846 | ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg); | |
847 | if (ret) | |
848 | goto out; | |
849 | } | |
850 | if (x->encap) { | |
851 | ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap); | |
852 | if (ret) | |
853 | goto out; | |
854 | } | |
855 | if (x->tfcpad) { | |
856 | ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); | |
857 | if (ret) | |
858 | goto out; | |
859 | } | |
860 | ret = xfrm_mark_put(skb, &x->mark); | |
861 | if (ret) | |
862 | goto out; | |
863 | if (x->replay_esn) | |
864 | ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, | |
865 | xfrm_replay_state_esn_len(x->replay_esn), | |
866 | x->replay_esn); | |
867 | else | |
868 | ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), | |
869 | &x->replay); | |
870 | if (ret) | |
871 | goto out; | |
872 | if (x->security) | |
873 | ret = copy_sec_ctx(x->security, skb); | |
874 | out: | |
875 | return ret; | |
876 | } | |
877 | ||
878 | static int dump_one_state(struct xfrm_state *x, int count, void *ptr) | |
879 | { | |
880 | struct xfrm_dump_info *sp = ptr; | |
881 | struct sk_buff *in_skb = sp->in_skb; | |
882 | struct sk_buff *skb = sp->out_skb; | |
883 | struct xfrm_usersa_info *p; | |
884 | struct nlmsghdr *nlh; | |
885 | int err; | |
886 | ||
887 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, | |
888 | XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); | |
889 | if (nlh == NULL) | |
890 | return -EMSGSIZE; | |
891 | ||
892 | p = nlmsg_data(nlh); | |
893 | ||
894 | err = copy_to_user_state_extra(x, p, skb); | |
895 | if (err) { | |
896 | nlmsg_cancel(skb, nlh); | |
897 | return err; | |
898 | } | |
899 | nlmsg_end(skb, nlh); | |
900 | return 0; | |
901 | } | |
902 | ||
903 | static int xfrm_dump_sa_done(struct netlink_callback *cb) | |
904 | { | |
905 | struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; | |
906 | struct sock *sk = cb->skb->sk; | |
907 | struct net *net = sock_net(sk); | |
908 | ||
909 | if (cb->args[0]) | |
910 | xfrm_state_walk_done(walk, net); | |
911 | return 0; | |
912 | } | |
913 | ||
914 | static const struct nla_policy xfrma_policy[XFRMA_MAX+1]; | |
915 | static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) | |
916 | { | |
917 | struct net *net = sock_net(skb->sk); | |
918 | struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; | |
919 | struct xfrm_dump_info info; | |
920 | ||
921 | BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > | |
922 | sizeof(cb->args) - sizeof(cb->args[0])); | |
923 | ||
924 | info.in_skb = cb->skb; | |
925 | info.out_skb = skb; | |
926 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
927 | info.nlmsg_flags = NLM_F_MULTI; | |
928 | ||
929 | if (!cb->args[0]) { | |
930 | struct nlattr *attrs[XFRMA_MAX+1]; | |
931 | struct xfrm_address_filter *filter = NULL; | |
932 | u8 proto = 0; | |
933 | int err; | |
934 | ||
935 | err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, | |
936 | xfrma_policy); | |
937 | if (err < 0) | |
938 | return err; | |
939 | ||
940 | if (attrs[XFRMA_ADDRESS_FILTER]) { | |
941 | filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), | |
942 | sizeof(*filter), GFP_KERNEL); | |
943 | if (filter == NULL) | |
944 | return -ENOMEM; | |
945 | } | |
946 | ||
947 | if (attrs[XFRMA_PROTO]) | |
948 | proto = nla_get_u8(attrs[XFRMA_PROTO]); | |
949 | ||
950 | xfrm_state_walk_init(walk, proto, filter); | |
951 | cb->args[0] = 1; | |
952 | } | |
953 | ||
954 | (void) xfrm_state_walk(net, walk, dump_one_state, &info); | |
955 | ||
956 | return skb->len; | |
957 | } | |
958 | ||
959 | static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, | |
960 | struct xfrm_state *x, u32 seq) | |
961 | { | |
962 | struct xfrm_dump_info info; | |
963 | struct sk_buff *skb; | |
964 | int err; | |
965 | ||
966 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
967 | if (!skb) | |
968 | return ERR_PTR(-ENOMEM); | |
969 | ||
970 | info.in_skb = in_skb; | |
971 | info.out_skb = skb; | |
972 | info.nlmsg_seq = seq; | |
973 | info.nlmsg_flags = 0; | |
974 | ||
975 | err = dump_one_state(x, 0, &info); | |
976 | if (err) { | |
977 | kfree_skb(skb); | |
978 | return ERR_PTR(err); | |
979 | } | |
980 | ||
981 | return skb; | |
982 | } | |
983 | ||
984 | /* A wrapper for nlmsg_multicast() checking that nlsk is still available. | |
985 | * Must be called with RCU read lock. | |
986 | */ | |
987 | static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, | |
988 | u32 pid, unsigned int group) | |
989 | { | |
990 | struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); | |
991 | ||
992 | if (nlsk) | |
993 | return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); | |
994 | else | |
995 | return -1; | |
996 | } | |
997 | ||
998 | static inline size_t xfrm_spdinfo_msgsize(void) | |
999 | { | |
1000 | return NLMSG_ALIGN(4) | |
1001 | + nla_total_size(sizeof(struct xfrmu_spdinfo)) | |
1002 | + nla_total_size(sizeof(struct xfrmu_spdhinfo)) | |
1003 | + nla_total_size(sizeof(struct xfrmu_spdhthresh)) | |
1004 | + nla_total_size(sizeof(struct xfrmu_spdhthresh)); | |
1005 | } | |
1006 | ||
1007 | static int build_spdinfo(struct sk_buff *skb, struct net *net, | |
1008 | u32 portid, u32 seq, u32 flags) | |
1009 | { | |
1010 | struct xfrmk_spdinfo si; | |
1011 | struct xfrmu_spdinfo spc; | |
1012 | struct xfrmu_spdhinfo sph; | |
1013 | struct xfrmu_spdhthresh spt4, spt6; | |
1014 | struct nlmsghdr *nlh; | |
1015 | int err; | |
1016 | u32 *f; | |
1017 | unsigned lseq; | |
1018 | ||
1019 | nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); | |
1020 | if (nlh == NULL) /* shouldn't really happen ... */ | |
1021 | return -EMSGSIZE; | |
1022 | ||
1023 | f = nlmsg_data(nlh); | |
1024 | *f = flags; | |
1025 | xfrm_spd_getinfo(net, &si); | |
1026 | spc.incnt = si.incnt; | |
1027 | spc.outcnt = si.outcnt; | |
1028 | spc.fwdcnt = si.fwdcnt; | |
1029 | spc.inscnt = si.inscnt; | |
1030 | spc.outscnt = si.outscnt; | |
1031 | spc.fwdscnt = si.fwdscnt; | |
1032 | sph.spdhcnt = si.spdhcnt; | |
1033 | sph.spdhmcnt = si.spdhmcnt; | |
1034 | ||
1035 | do { | |
1036 | lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); | |
1037 | ||
1038 | spt4.lbits = net->xfrm.policy_hthresh.lbits4; | |
1039 | spt4.rbits = net->xfrm.policy_hthresh.rbits4; | |
1040 | spt6.lbits = net->xfrm.policy_hthresh.lbits6; | |
1041 | spt6.rbits = net->xfrm.policy_hthresh.rbits6; | |
1042 | } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); | |
1043 | ||
1044 | err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); | |
1045 | if (!err) | |
1046 | err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); | |
1047 | if (!err) | |
1048 | err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); | |
1049 | if (!err) | |
1050 | err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); | |
1051 | if (err) { | |
1052 | nlmsg_cancel(skb, nlh); | |
1053 | return err; | |
1054 | } | |
1055 | ||
1056 | nlmsg_end(skb, nlh); | |
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1061 | struct nlattr **attrs) | |
1062 | { | |
1063 | struct net *net = sock_net(skb->sk); | |
1064 | struct xfrmu_spdhthresh *thresh4 = NULL; | |
1065 | struct xfrmu_spdhthresh *thresh6 = NULL; | |
1066 | ||
1067 | /* selector prefixlen thresholds to hash policies */ | |
1068 | if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { | |
1069 | struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; | |
1070 | ||
1071 | if (nla_len(rta) < sizeof(*thresh4)) | |
1072 | return -EINVAL; | |
1073 | thresh4 = nla_data(rta); | |
1074 | if (thresh4->lbits > 32 || thresh4->rbits > 32) | |
1075 | return -EINVAL; | |
1076 | } | |
1077 | if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { | |
1078 | struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; | |
1079 | ||
1080 | if (nla_len(rta) < sizeof(*thresh6)) | |
1081 | return -EINVAL; | |
1082 | thresh6 = nla_data(rta); | |
1083 | if (thresh6->lbits > 128 || thresh6->rbits > 128) | |
1084 | return -EINVAL; | |
1085 | } | |
1086 | ||
1087 | if (thresh4 || thresh6) { | |
1088 | write_seqlock(&net->xfrm.policy_hthresh.lock); | |
1089 | if (thresh4) { | |
1090 | net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; | |
1091 | net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; | |
1092 | } | |
1093 | if (thresh6) { | |
1094 | net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; | |
1095 | net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; | |
1096 | } | |
1097 | write_sequnlock(&net->xfrm.policy_hthresh.lock); | |
1098 | ||
1099 | xfrm_policy_hash_rebuild(net); | |
1100 | } | |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1106 | struct nlattr **attrs) | |
1107 | { | |
1108 | struct net *net = sock_net(skb->sk); | |
1109 | struct sk_buff *r_skb; | |
1110 | u32 *flags = nlmsg_data(nlh); | |
1111 | u32 sportid = NETLINK_CB(skb).portid; | |
1112 | u32 seq = nlh->nlmsg_seq; | |
1113 | ||
1114 | r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); | |
1115 | if (r_skb == NULL) | |
1116 | return -ENOMEM; | |
1117 | ||
1118 | if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0) | |
1119 | BUG(); | |
1120 | ||
1121 | return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); | |
1122 | } | |
1123 | ||
1124 | static inline size_t xfrm_sadinfo_msgsize(void) | |
1125 | { | |
1126 | return NLMSG_ALIGN(4) | |
1127 | + nla_total_size(sizeof(struct xfrmu_sadhinfo)) | |
1128 | + nla_total_size(4); /* XFRMA_SAD_CNT */ | |
1129 | } | |
1130 | ||
1131 | static int build_sadinfo(struct sk_buff *skb, struct net *net, | |
1132 | u32 portid, u32 seq, u32 flags) | |
1133 | { | |
1134 | struct xfrmk_sadinfo si; | |
1135 | struct xfrmu_sadhinfo sh; | |
1136 | struct nlmsghdr *nlh; | |
1137 | int err; | |
1138 | u32 *f; | |
1139 | ||
1140 | nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); | |
1141 | if (nlh == NULL) /* shouldn't really happen ... */ | |
1142 | return -EMSGSIZE; | |
1143 | ||
1144 | f = nlmsg_data(nlh); | |
1145 | *f = flags; | |
1146 | xfrm_sad_getinfo(net, &si); | |
1147 | ||
1148 | sh.sadhmcnt = si.sadhmcnt; | |
1149 | sh.sadhcnt = si.sadhcnt; | |
1150 | ||
1151 | err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); | |
1152 | if (!err) | |
1153 | err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); | |
1154 | if (err) { | |
1155 | nlmsg_cancel(skb, nlh); | |
1156 | return err; | |
1157 | } | |
1158 | ||
1159 | nlmsg_end(skb, nlh); | |
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1164 | struct nlattr **attrs) | |
1165 | { | |
1166 | struct net *net = sock_net(skb->sk); | |
1167 | struct sk_buff *r_skb; | |
1168 | u32 *flags = nlmsg_data(nlh); | |
1169 | u32 sportid = NETLINK_CB(skb).portid; | |
1170 | u32 seq = nlh->nlmsg_seq; | |
1171 | ||
1172 | r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); | |
1173 | if (r_skb == NULL) | |
1174 | return -ENOMEM; | |
1175 | ||
1176 | if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0) | |
1177 | BUG(); | |
1178 | ||
1179 | return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); | |
1180 | } | |
1181 | ||
1182 | static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1183 | struct nlattr **attrs) | |
1184 | { | |
1185 | struct net *net = sock_net(skb->sk); | |
1186 | struct xfrm_usersa_id *p = nlmsg_data(nlh); | |
1187 | struct xfrm_state *x; | |
1188 | struct sk_buff *resp_skb; | |
1189 | int err = -ESRCH; | |
1190 | ||
1191 | x = xfrm_user_state_lookup(net, p, attrs, &err); | |
1192 | if (x == NULL) | |
1193 | goto out_noput; | |
1194 | ||
1195 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); | |
1196 | if (IS_ERR(resp_skb)) { | |
1197 | err = PTR_ERR(resp_skb); | |
1198 | } else { | |
1199 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); | |
1200 | } | |
1201 | xfrm_state_put(x); | |
1202 | out_noput: | |
1203 | return err; | |
1204 | } | |
1205 | ||
1206 | static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1207 | struct nlattr **attrs) | |
1208 | { | |
1209 | struct net *net = sock_net(skb->sk); | |
1210 | struct xfrm_state *x; | |
1211 | struct xfrm_userspi_info *p; | |
1212 | struct sk_buff *resp_skb; | |
1213 | xfrm_address_t *daddr; | |
1214 | int family; | |
1215 | int err; | |
1216 | u32 mark; | |
1217 | struct xfrm_mark m; | |
1218 | ||
1219 | p = nlmsg_data(nlh); | |
1220 | err = verify_spi_info(p->info.id.proto, p->min, p->max); | |
1221 | if (err) | |
1222 | goto out_noput; | |
1223 | ||
1224 | family = p->info.family; | |
1225 | daddr = &p->info.id.daddr; | |
1226 | ||
1227 | x = NULL; | |
1228 | ||
1229 | mark = xfrm_mark_get(attrs, &m); | |
1230 | if (p->info.seq) { | |
1231 | x = xfrm_find_acq_byseq(net, mark, p->info.seq); | |
1232 | if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { | |
1233 | xfrm_state_put(x); | |
1234 | x = NULL; | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | if (!x) | |
1239 | x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, | |
1240 | p->info.id.proto, daddr, | |
1241 | &p->info.saddr, 1, | |
1242 | family); | |
1243 | err = -ENOENT; | |
1244 | if (x == NULL) | |
1245 | goto out_noput; | |
1246 | ||
1247 | err = xfrm_alloc_spi(x, p->min, p->max); | |
1248 | if (err) | |
1249 | goto out; | |
1250 | ||
1251 | resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); | |
1252 | if (IS_ERR(resp_skb)) { | |
1253 | err = PTR_ERR(resp_skb); | |
1254 | goto out; | |
1255 | } | |
1256 | ||
1257 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); | |
1258 | ||
1259 | out: | |
1260 | xfrm_state_put(x); | |
1261 | out_noput: | |
1262 | return err; | |
1263 | } | |
1264 | ||
1265 | static int verify_policy_dir(u8 dir) | |
1266 | { | |
1267 | switch (dir) { | |
1268 | case XFRM_POLICY_IN: | |
1269 | case XFRM_POLICY_OUT: | |
1270 | case XFRM_POLICY_FWD: | |
1271 | break; | |
1272 | ||
1273 | default: | |
1274 | return -EINVAL; | |
1275 | } | |
1276 | ||
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | static int verify_policy_type(u8 type) | |
1281 | { | |
1282 | switch (type) { | |
1283 | case XFRM_POLICY_TYPE_MAIN: | |
1284 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1285 | case XFRM_POLICY_TYPE_SUB: | |
1286 | #endif | |
1287 | break; | |
1288 | ||
1289 | default: | |
1290 | return -EINVAL; | |
1291 | } | |
1292 | ||
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | static int verify_newpolicy_info(struct xfrm_userpolicy_info *p) | |
1297 | { | |
1298 | int ret; | |
1299 | ||
1300 | switch (p->share) { | |
1301 | case XFRM_SHARE_ANY: | |
1302 | case XFRM_SHARE_SESSION: | |
1303 | case XFRM_SHARE_USER: | |
1304 | case XFRM_SHARE_UNIQUE: | |
1305 | break; | |
1306 | ||
1307 | default: | |
1308 | return -EINVAL; | |
1309 | } | |
1310 | ||
1311 | switch (p->action) { | |
1312 | case XFRM_POLICY_ALLOW: | |
1313 | case XFRM_POLICY_BLOCK: | |
1314 | break; | |
1315 | ||
1316 | default: | |
1317 | return -EINVAL; | |
1318 | } | |
1319 | ||
1320 | switch (p->sel.family) { | |
1321 | case AF_INET: | |
1322 | break; | |
1323 | ||
1324 | case AF_INET6: | |
1325 | #if IS_ENABLED(CONFIG_IPV6) | |
1326 | break; | |
1327 | #else | |
1328 | return -EAFNOSUPPORT; | |
1329 | #endif | |
1330 | ||
1331 | default: | |
1332 | return -EINVAL; | |
1333 | } | |
1334 | ||
1335 | ret = verify_policy_dir(p->dir); | |
1336 | if (ret) | |
1337 | return ret; | |
1338 | if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir)) | |
1339 | return -EINVAL; | |
1340 | ||
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) | |
1345 | { | |
1346 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; | |
1347 | struct xfrm_user_sec_ctx *uctx; | |
1348 | ||
1349 | if (!rt) | |
1350 | return 0; | |
1351 | ||
1352 | uctx = nla_data(rt); | |
1353 | return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); | |
1354 | } | |
1355 | ||
1356 | static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, | |
1357 | int nr) | |
1358 | { | |
1359 | int i; | |
1360 | ||
1361 | xp->xfrm_nr = nr; | |
1362 | for (i = 0; i < nr; i++, ut++) { | |
1363 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; | |
1364 | ||
1365 | memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); | |
1366 | memcpy(&t->saddr, &ut->saddr, | |
1367 | sizeof(xfrm_address_t)); | |
1368 | t->reqid = ut->reqid; | |
1369 | t->mode = ut->mode; | |
1370 | t->share = ut->share; | |
1371 | t->optional = ut->optional; | |
1372 | t->aalgos = ut->aalgos; | |
1373 | t->ealgos = ut->ealgos; | |
1374 | t->calgos = ut->calgos; | |
1375 | /* If all masks are ~0, then we allow all algorithms. */ | |
1376 | t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); | |
1377 | t->encap_family = ut->family; | |
1378 | } | |
1379 | } | |
1380 | ||
1381 | static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) | |
1382 | { | |
1383 | int i; | |
1384 | ||
1385 | if (nr > XFRM_MAX_DEPTH) | |
1386 | return -EINVAL; | |
1387 | ||
1388 | for (i = 0; i < nr; i++) { | |
1389 | /* We never validated the ut->family value, so many | |
1390 | * applications simply leave it at zero. The check was | |
1391 | * never made and ut->family was ignored because all | |
1392 | * templates could be assumed to have the same family as | |
1393 | * the policy itself. Now that we will have ipv4-in-ipv6 | |
1394 | * and ipv6-in-ipv4 tunnels, this is no longer true. | |
1395 | */ | |
1396 | if (!ut[i].family) | |
1397 | ut[i].family = family; | |
1398 | ||
1399 | switch (ut[i].family) { | |
1400 | case AF_INET: | |
1401 | break; | |
1402 | #if IS_ENABLED(CONFIG_IPV6) | |
1403 | case AF_INET6: | |
1404 | break; | |
1405 | #endif | |
1406 | default: | |
1407 | return -EINVAL; | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | ||
1414 | static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs) | |
1415 | { | |
1416 | struct nlattr *rt = attrs[XFRMA_TMPL]; | |
1417 | ||
1418 | if (!rt) { | |
1419 | pol->xfrm_nr = 0; | |
1420 | } else { | |
1421 | struct xfrm_user_tmpl *utmpl = nla_data(rt); | |
1422 | int nr = nla_len(rt) / sizeof(*utmpl); | |
1423 | int err; | |
1424 | ||
1425 | err = validate_tmpl(nr, utmpl, pol->family); | |
1426 | if (err) | |
1427 | return err; | |
1428 | ||
1429 | copy_templates(pol, utmpl, nr); | |
1430 | } | |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs) | |
1435 | { | |
1436 | struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; | |
1437 | struct xfrm_userpolicy_type *upt; | |
1438 | u8 type = XFRM_POLICY_TYPE_MAIN; | |
1439 | int err; | |
1440 | ||
1441 | if (rt) { | |
1442 | upt = nla_data(rt); | |
1443 | type = upt->type; | |
1444 | } | |
1445 | ||
1446 | err = verify_policy_type(type); | |
1447 | if (err) | |
1448 | return err; | |
1449 | ||
1450 | *tp = type; | |
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) | |
1455 | { | |
1456 | xp->priority = p->priority; | |
1457 | xp->index = p->index; | |
1458 | memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); | |
1459 | memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); | |
1460 | xp->action = p->action; | |
1461 | xp->flags = p->flags; | |
1462 | xp->family = p->sel.family; | |
1463 | /* XXX xp->share = p->share; */ | |
1464 | } | |
1465 | ||
1466 | static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) | |
1467 | { | |
1468 | memset(p, 0, sizeof(*p)); | |
1469 | memcpy(&p->sel, &xp->selector, sizeof(p->sel)); | |
1470 | memcpy(&p->lft, &xp->lft, sizeof(p->lft)); | |
1471 | memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); | |
1472 | p->priority = xp->priority; | |
1473 | p->index = xp->index; | |
1474 | p->sel.family = xp->family; | |
1475 | p->dir = dir; | |
1476 | p->action = xp->action; | |
1477 | p->flags = xp->flags; | |
1478 | p->share = XFRM_SHARE_ANY; /* XXX xp->share */ | |
1479 | } | |
1480 | ||
1481 | static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp) | |
1482 | { | |
1483 | struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); | |
1484 | int err; | |
1485 | ||
1486 | if (!xp) { | |
1487 | *errp = -ENOMEM; | |
1488 | return NULL; | |
1489 | } | |
1490 | ||
1491 | copy_from_user_policy(xp, p); | |
1492 | ||
1493 | err = copy_from_user_policy_type(&xp->type, attrs); | |
1494 | if (err) | |
1495 | goto error; | |
1496 | ||
1497 | if (!(err = copy_from_user_tmpl(xp, attrs))) | |
1498 | err = copy_from_user_sec_ctx(xp, attrs); | |
1499 | if (err) | |
1500 | goto error; | |
1501 | ||
1502 | xfrm_mark_get(attrs, &xp->mark); | |
1503 | ||
1504 | return xp; | |
1505 | error: | |
1506 | *errp = err; | |
1507 | xp->walk.dead = 1; | |
1508 | xfrm_policy_destroy(xp); | |
1509 | return NULL; | |
1510 | } | |
1511 | ||
1512 | static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1513 | struct nlattr **attrs) | |
1514 | { | |
1515 | struct net *net = sock_net(skb->sk); | |
1516 | struct xfrm_userpolicy_info *p = nlmsg_data(nlh); | |
1517 | struct xfrm_policy *xp; | |
1518 | struct km_event c; | |
1519 | int err; | |
1520 | int excl; | |
1521 | ||
1522 | err = verify_newpolicy_info(p); | |
1523 | if (err) | |
1524 | return err; | |
1525 | err = verify_sec_ctx_len(attrs); | |
1526 | if (err) | |
1527 | return err; | |
1528 | ||
1529 | xp = xfrm_policy_construct(net, p, attrs, &err); | |
1530 | if (!xp) | |
1531 | return err; | |
1532 | ||
1533 | /* shouldn't excl be based on nlh flags?? | |
1534 | * Aha! this is anti-netlink really i.e more pfkey derived | |
1535 | * in netlink excl is a flag and you wouldnt need | |
1536 | * a type XFRM_MSG_UPDPOLICY - JHS */ | |
1537 | excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; | |
1538 | err = xfrm_policy_insert(p->dir, xp, excl); | |
1539 | xfrm_audit_policy_add(xp, err ? 0 : 1, true); | |
1540 | ||
1541 | if (err) { | |
1542 | security_xfrm_policy_free(xp->security); | |
1543 | kfree(xp); | |
1544 | return err; | |
1545 | } | |
1546 | ||
1547 | c.event = nlh->nlmsg_type; | |
1548 | c.seq = nlh->nlmsg_seq; | |
1549 | c.portid = nlh->nlmsg_pid; | |
1550 | km_policy_notify(xp, p->dir, &c); | |
1551 | ||
1552 | xfrm_pol_put(xp); | |
1553 | ||
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) | |
1558 | { | |
1559 | struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; | |
1560 | int i; | |
1561 | ||
1562 | if (xp->xfrm_nr == 0) | |
1563 | return 0; | |
1564 | ||
1565 | for (i = 0; i < xp->xfrm_nr; i++) { | |
1566 | struct xfrm_user_tmpl *up = &vec[i]; | |
1567 | struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; | |
1568 | ||
1569 | memset(up, 0, sizeof(*up)); | |
1570 | memcpy(&up->id, &kp->id, sizeof(up->id)); | |
1571 | up->family = kp->encap_family; | |
1572 | memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); | |
1573 | up->reqid = kp->reqid; | |
1574 | up->mode = kp->mode; | |
1575 | up->share = kp->share; | |
1576 | up->optional = kp->optional; | |
1577 | up->aalgos = kp->aalgos; | |
1578 | up->ealgos = kp->ealgos; | |
1579 | up->calgos = kp->calgos; | |
1580 | } | |
1581 | ||
1582 | return nla_put(skb, XFRMA_TMPL, | |
1583 | sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); | |
1584 | } | |
1585 | ||
1586 | static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) | |
1587 | { | |
1588 | if (x->security) { | |
1589 | return copy_sec_ctx(x->security, skb); | |
1590 | } | |
1591 | return 0; | |
1592 | } | |
1593 | ||
1594 | static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) | |
1595 | { | |
1596 | if (xp->security) | |
1597 | return copy_sec_ctx(xp->security, skb); | |
1598 | return 0; | |
1599 | } | |
1600 | static inline size_t userpolicy_type_attrsize(void) | |
1601 | { | |
1602 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1603 | return nla_total_size(sizeof(struct xfrm_userpolicy_type)); | |
1604 | #else | |
1605 | return 0; | |
1606 | #endif | |
1607 | } | |
1608 | ||
1609 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1610 | static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) | |
1611 | { | |
1612 | struct xfrm_userpolicy_type upt = { | |
1613 | .type = type, | |
1614 | }; | |
1615 | ||
1616 | return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); | |
1617 | } | |
1618 | ||
1619 | #else | |
1620 | static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) | |
1621 | { | |
1622 | return 0; | |
1623 | } | |
1624 | #endif | |
1625 | ||
1626 | static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) | |
1627 | { | |
1628 | struct xfrm_dump_info *sp = ptr; | |
1629 | struct xfrm_userpolicy_info *p; | |
1630 | struct sk_buff *in_skb = sp->in_skb; | |
1631 | struct sk_buff *skb = sp->out_skb; | |
1632 | struct nlmsghdr *nlh; | |
1633 | int err; | |
1634 | ||
1635 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, | |
1636 | XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); | |
1637 | if (nlh == NULL) | |
1638 | return -EMSGSIZE; | |
1639 | ||
1640 | p = nlmsg_data(nlh); | |
1641 | copy_to_user_policy(xp, p, dir); | |
1642 | err = copy_to_user_tmpl(xp, skb); | |
1643 | if (!err) | |
1644 | err = copy_to_user_sec_ctx(xp, skb); | |
1645 | if (!err) | |
1646 | err = copy_to_user_policy_type(xp->type, skb); | |
1647 | if (!err) | |
1648 | err = xfrm_mark_put(skb, &xp->mark); | |
1649 | if (err) { | |
1650 | nlmsg_cancel(skb, nlh); | |
1651 | return err; | |
1652 | } | |
1653 | nlmsg_end(skb, nlh); | |
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | static int xfrm_dump_policy_done(struct netlink_callback *cb) | |
1658 | { | |
1659 | struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; | |
1660 | struct net *net = sock_net(cb->skb->sk); | |
1661 | ||
1662 | xfrm_policy_walk_done(walk, net); | |
1663 | return 0; | |
1664 | } | |
1665 | ||
1666 | static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) | |
1667 | { | |
1668 | struct net *net = sock_net(skb->sk); | |
1669 | struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1]; | |
1670 | struct xfrm_dump_info info; | |
1671 | ||
1672 | BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) > | |
1673 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1674 | ||
1675 | info.in_skb = cb->skb; | |
1676 | info.out_skb = skb; | |
1677 | info.nlmsg_seq = cb->nlh->nlmsg_seq; | |
1678 | info.nlmsg_flags = NLM_F_MULTI; | |
1679 | ||
1680 | if (!cb->args[0]) { | |
1681 | cb->args[0] = 1; | |
1682 | xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); | |
1683 | } | |
1684 | ||
1685 | (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); | |
1686 | ||
1687 | return skb->len; | |
1688 | } | |
1689 | ||
1690 | static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, | |
1691 | struct xfrm_policy *xp, | |
1692 | int dir, u32 seq) | |
1693 | { | |
1694 | struct xfrm_dump_info info; | |
1695 | struct sk_buff *skb; | |
1696 | int err; | |
1697 | ||
1698 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1699 | if (!skb) | |
1700 | return ERR_PTR(-ENOMEM); | |
1701 | ||
1702 | info.in_skb = in_skb; | |
1703 | info.out_skb = skb; | |
1704 | info.nlmsg_seq = seq; | |
1705 | info.nlmsg_flags = 0; | |
1706 | ||
1707 | err = dump_one_policy(xp, dir, 0, &info); | |
1708 | if (err) { | |
1709 | kfree_skb(skb); | |
1710 | return ERR_PTR(err); | |
1711 | } | |
1712 | ||
1713 | return skb; | |
1714 | } | |
1715 | ||
1716 | static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1717 | struct nlattr **attrs) | |
1718 | { | |
1719 | struct net *net = sock_net(skb->sk); | |
1720 | struct xfrm_policy *xp; | |
1721 | struct xfrm_userpolicy_id *p; | |
1722 | u8 type = XFRM_POLICY_TYPE_MAIN; | |
1723 | int err; | |
1724 | struct km_event c; | |
1725 | int delete; | |
1726 | struct xfrm_mark m; | |
1727 | u32 mark = xfrm_mark_get(attrs, &m); | |
1728 | ||
1729 | p = nlmsg_data(nlh); | |
1730 | delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; | |
1731 | ||
1732 | err = copy_from_user_policy_type(&type, attrs); | |
1733 | if (err) | |
1734 | return err; | |
1735 | ||
1736 | err = verify_policy_dir(p->dir); | |
1737 | if (err) | |
1738 | return err; | |
1739 | ||
1740 | if (p->index) | |
1741 | xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err); | |
1742 | else { | |
1743 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; | |
1744 | struct xfrm_sec_ctx *ctx; | |
1745 | ||
1746 | err = verify_sec_ctx_len(attrs); | |
1747 | if (err) | |
1748 | return err; | |
1749 | ||
1750 | ctx = NULL; | |
1751 | if (rt) { | |
1752 | struct xfrm_user_sec_ctx *uctx = nla_data(rt); | |
1753 | ||
1754 | err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); | |
1755 | if (err) | |
1756 | return err; | |
1757 | } | |
1758 | xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel, | |
1759 | ctx, delete, &err); | |
1760 | security_xfrm_policy_free(ctx); | |
1761 | } | |
1762 | if (xp == NULL) | |
1763 | return -ENOENT; | |
1764 | ||
1765 | if (!delete) { | |
1766 | struct sk_buff *resp_skb; | |
1767 | ||
1768 | resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); | |
1769 | if (IS_ERR(resp_skb)) { | |
1770 | err = PTR_ERR(resp_skb); | |
1771 | } else { | |
1772 | err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, | |
1773 | NETLINK_CB(skb).portid); | |
1774 | } | |
1775 | } else { | |
1776 | xfrm_audit_policy_delete(xp, err ? 0 : 1, true); | |
1777 | ||
1778 | if (err != 0) | |
1779 | goto out; | |
1780 | ||
1781 | c.data.byid = p->index; | |
1782 | c.event = nlh->nlmsg_type; | |
1783 | c.seq = nlh->nlmsg_seq; | |
1784 | c.portid = nlh->nlmsg_pid; | |
1785 | km_policy_notify(xp, p->dir, &c); | |
1786 | } | |
1787 | ||
1788 | out: | |
1789 | xfrm_pol_put(xp); | |
1790 | if (delete && err == 0) | |
1791 | xfrm_garbage_collect(net); | |
1792 | return err; | |
1793 | } | |
1794 | ||
1795 | static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1796 | struct nlattr **attrs) | |
1797 | { | |
1798 | struct net *net = sock_net(skb->sk); | |
1799 | struct km_event c; | |
1800 | struct xfrm_usersa_flush *p = nlmsg_data(nlh); | |
1801 | int err; | |
1802 | ||
1803 | err = xfrm_state_flush(net, p->proto, true); | |
1804 | if (err) { | |
1805 | if (err == -ESRCH) /* empty table */ | |
1806 | return 0; | |
1807 | return err; | |
1808 | } | |
1809 | c.data.proto = p->proto; | |
1810 | c.event = nlh->nlmsg_type; | |
1811 | c.seq = nlh->nlmsg_seq; | |
1812 | c.portid = nlh->nlmsg_pid; | |
1813 | c.net = net; | |
1814 | km_state_notify(NULL, &c); | |
1815 | ||
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x) | |
1820 | { | |
1821 | size_t replay_size = x->replay_esn ? | |
1822 | xfrm_replay_state_esn_len(x->replay_esn) : | |
1823 | sizeof(struct xfrm_replay_state); | |
1824 | ||
1825 | return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) | |
1826 | + nla_total_size(replay_size) | |
1827 | + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) | |
1828 | + nla_total_size(sizeof(struct xfrm_mark)) | |
1829 | + nla_total_size(4) /* XFRM_AE_RTHR */ | |
1830 | + nla_total_size(4); /* XFRM_AE_ETHR */ | |
1831 | } | |
1832 | ||
1833 | static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) | |
1834 | { | |
1835 | struct xfrm_aevent_id *id; | |
1836 | struct nlmsghdr *nlh; | |
1837 | int err; | |
1838 | ||
1839 | nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); | |
1840 | if (nlh == NULL) | |
1841 | return -EMSGSIZE; | |
1842 | ||
1843 | id = nlmsg_data(nlh); | |
1844 | memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); | |
1845 | id->sa_id.spi = x->id.spi; | |
1846 | id->sa_id.family = x->props.family; | |
1847 | id->sa_id.proto = x->id.proto; | |
1848 | memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); | |
1849 | id->reqid = x->props.reqid; | |
1850 | id->flags = c->data.aevent; | |
1851 | ||
1852 | if (x->replay_esn) { | |
1853 | err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, | |
1854 | xfrm_replay_state_esn_len(x->replay_esn), | |
1855 | x->replay_esn); | |
1856 | } else { | |
1857 | err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), | |
1858 | &x->replay); | |
1859 | } | |
1860 | if (err) | |
1861 | goto out_cancel; | |
1862 | err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, | |
1863 | XFRMA_PAD); | |
1864 | if (err) | |
1865 | goto out_cancel; | |
1866 | ||
1867 | if (id->flags & XFRM_AE_RTHR) { | |
1868 | err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); | |
1869 | if (err) | |
1870 | goto out_cancel; | |
1871 | } | |
1872 | if (id->flags & XFRM_AE_ETHR) { | |
1873 | err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, | |
1874 | x->replay_maxage * 10 / HZ); | |
1875 | if (err) | |
1876 | goto out_cancel; | |
1877 | } | |
1878 | err = xfrm_mark_put(skb, &x->mark); | |
1879 | if (err) | |
1880 | goto out_cancel; | |
1881 | ||
1882 | nlmsg_end(skb, nlh); | |
1883 | return 0; | |
1884 | ||
1885 | out_cancel: | |
1886 | nlmsg_cancel(skb, nlh); | |
1887 | return err; | |
1888 | } | |
1889 | ||
1890 | static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1891 | struct nlattr **attrs) | |
1892 | { | |
1893 | struct net *net = sock_net(skb->sk); | |
1894 | struct xfrm_state *x; | |
1895 | struct sk_buff *r_skb; | |
1896 | int err; | |
1897 | struct km_event c; | |
1898 | u32 mark; | |
1899 | struct xfrm_mark m; | |
1900 | struct xfrm_aevent_id *p = nlmsg_data(nlh); | |
1901 | struct xfrm_usersa_id *id = &p->sa_id; | |
1902 | ||
1903 | mark = xfrm_mark_get(attrs, &m); | |
1904 | ||
1905 | x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); | |
1906 | if (x == NULL) | |
1907 | return -ESRCH; | |
1908 | ||
1909 | r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); | |
1910 | if (r_skb == NULL) { | |
1911 | xfrm_state_put(x); | |
1912 | return -ENOMEM; | |
1913 | } | |
1914 | ||
1915 | /* | |
1916 | * XXX: is this lock really needed - none of the other | |
1917 | * gets lock (the concern is things getting updated | |
1918 | * while we are still reading) - jhs | |
1919 | */ | |
1920 | spin_lock_bh(&x->lock); | |
1921 | c.data.aevent = p->flags; | |
1922 | c.seq = nlh->nlmsg_seq; | |
1923 | c.portid = nlh->nlmsg_pid; | |
1924 | ||
1925 | if (build_aevent(r_skb, x, &c) < 0) | |
1926 | BUG(); | |
1927 | err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); | |
1928 | spin_unlock_bh(&x->lock); | |
1929 | xfrm_state_put(x); | |
1930 | return err; | |
1931 | } | |
1932 | ||
1933 | static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1934 | struct nlattr **attrs) | |
1935 | { | |
1936 | struct net *net = sock_net(skb->sk); | |
1937 | struct xfrm_state *x; | |
1938 | struct km_event c; | |
1939 | int err = -EINVAL; | |
1940 | u32 mark = 0; | |
1941 | struct xfrm_mark m; | |
1942 | struct xfrm_aevent_id *p = nlmsg_data(nlh); | |
1943 | struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; | |
1944 | struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; | |
1945 | struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; | |
1946 | struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; | |
1947 | struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; | |
1948 | ||
1949 | if (!lt && !rp && !re && !et && !rt) | |
1950 | return err; | |
1951 | ||
1952 | /* pedantic mode - thou shalt sayeth replaceth */ | |
1953 | if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) | |
1954 | return err; | |
1955 | ||
1956 | mark = xfrm_mark_get(attrs, &m); | |
1957 | ||
1958 | x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); | |
1959 | if (x == NULL) | |
1960 | return -ESRCH; | |
1961 | ||
1962 | if (x->km.state != XFRM_STATE_VALID) | |
1963 | goto out; | |
1964 | ||
1965 | err = xfrm_replay_verify_len(x->replay_esn, re); | |
1966 | if (err) | |
1967 | goto out; | |
1968 | ||
1969 | spin_lock_bh(&x->lock); | |
1970 | xfrm_update_ae_params(x, attrs, 1); | |
1971 | spin_unlock_bh(&x->lock); | |
1972 | ||
1973 | c.event = nlh->nlmsg_type; | |
1974 | c.seq = nlh->nlmsg_seq; | |
1975 | c.portid = nlh->nlmsg_pid; | |
1976 | c.data.aevent = XFRM_AE_CU; | |
1977 | km_state_notify(x, &c); | |
1978 | err = 0; | |
1979 | out: | |
1980 | xfrm_state_put(x); | |
1981 | return err; | |
1982 | } | |
1983 | ||
1984 | static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1985 | struct nlattr **attrs) | |
1986 | { | |
1987 | struct net *net = sock_net(skb->sk); | |
1988 | struct km_event c; | |
1989 | u8 type = XFRM_POLICY_TYPE_MAIN; | |
1990 | int err; | |
1991 | ||
1992 | err = copy_from_user_policy_type(&type, attrs); | |
1993 | if (err) | |
1994 | return err; | |
1995 | ||
1996 | err = xfrm_policy_flush(net, type, true); | |
1997 | if (err) { | |
1998 | if (err == -ESRCH) /* empty table */ | |
1999 | return 0; | |
2000 | return err; | |
2001 | } | |
2002 | ||
2003 | c.data.type = type; | |
2004 | c.event = nlh->nlmsg_type; | |
2005 | c.seq = nlh->nlmsg_seq; | |
2006 | c.portid = nlh->nlmsg_pid; | |
2007 | c.net = net; | |
2008 | km_policy_notify(NULL, 0, &c); | |
2009 | return 0; | |
2010 | } | |
2011 | ||
2012 | static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2013 | struct nlattr **attrs) | |
2014 | { | |
2015 | struct net *net = sock_net(skb->sk); | |
2016 | struct xfrm_policy *xp; | |
2017 | struct xfrm_user_polexpire *up = nlmsg_data(nlh); | |
2018 | struct xfrm_userpolicy_info *p = &up->pol; | |
2019 | u8 type = XFRM_POLICY_TYPE_MAIN; | |
2020 | int err = -ENOENT; | |
2021 | struct xfrm_mark m; | |
2022 | u32 mark = xfrm_mark_get(attrs, &m); | |
2023 | ||
2024 | err = copy_from_user_policy_type(&type, attrs); | |
2025 | if (err) | |
2026 | return err; | |
2027 | ||
2028 | err = verify_policy_dir(p->dir); | |
2029 | if (err) | |
2030 | return err; | |
2031 | ||
2032 | if (p->index) | |
2033 | xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err); | |
2034 | else { | |
2035 | struct nlattr *rt = attrs[XFRMA_SEC_CTX]; | |
2036 | struct xfrm_sec_ctx *ctx; | |
2037 | ||
2038 | err = verify_sec_ctx_len(attrs); | |
2039 | if (err) | |
2040 | return err; | |
2041 | ||
2042 | ctx = NULL; | |
2043 | if (rt) { | |
2044 | struct xfrm_user_sec_ctx *uctx = nla_data(rt); | |
2045 | ||
2046 | err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); | |
2047 | if (err) | |
2048 | return err; | |
2049 | } | |
2050 | xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, | |
2051 | &p->sel, ctx, 0, &err); | |
2052 | security_xfrm_policy_free(ctx); | |
2053 | } | |
2054 | if (xp == NULL) | |
2055 | return -ENOENT; | |
2056 | ||
2057 | if (unlikely(xp->walk.dead)) | |
2058 | goto out; | |
2059 | ||
2060 | err = 0; | |
2061 | if (up->hard) { | |
2062 | xfrm_policy_delete(xp, p->dir); | |
2063 | xfrm_audit_policy_delete(xp, 1, true); | |
2064 | } | |
2065 | km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); | |
2066 | ||
2067 | out: | |
2068 | xfrm_pol_put(xp); | |
2069 | return err; | |
2070 | } | |
2071 | ||
2072 | static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2073 | struct nlattr **attrs) | |
2074 | { | |
2075 | struct net *net = sock_net(skb->sk); | |
2076 | struct xfrm_state *x; | |
2077 | int err; | |
2078 | struct xfrm_user_expire *ue = nlmsg_data(nlh); | |
2079 | struct xfrm_usersa_info *p = &ue->state; | |
2080 | struct xfrm_mark m; | |
2081 | u32 mark = xfrm_mark_get(attrs, &m); | |
2082 | ||
2083 | x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); | |
2084 | ||
2085 | err = -ENOENT; | |
2086 | if (x == NULL) | |
2087 | return err; | |
2088 | ||
2089 | spin_lock_bh(&x->lock); | |
2090 | err = -EINVAL; | |
2091 | if (x->km.state != XFRM_STATE_VALID) | |
2092 | goto out; | |
2093 | km_state_expired(x, ue->hard, nlh->nlmsg_pid); | |
2094 | ||
2095 | if (ue->hard) { | |
2096 | __xfrm_state_delete(x); | |
2097 | xfrm_audit_state_delete(x, 1, true); | |
2098 | } | |
2099 | err = 0; | |
2100 | out: | |
2101 | spin_unlock_bh(&x->lock); | |
2102 | xfrm_state_put(x); | |
2103 | return err; | |
2104 | } | |
2105 | ||
2106 | static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2107 | struct nlattr **attrs) | |
2108 | { | |
2109 | struct net *net = sock_net(skb->sk); | |
2110 | struct xfrm_policy *xp; | |
2111 | struct xfrm_user_tmpl *ut; | |
2112 | int i; | |
2113 | struct nlattr *rt = attrs[XFRMA_TMPL]; | |
2114 | struct xfrm_mark mark; | |
2115 | ||
2116 | struct xfrm_user_acquire *ua = nlmsg_data(nlh); | |
2117 | struct xfrm_state *x = xfrm_state_alloc(net); | |
2118 | int err = -ENOMEM; | |
2119 | ||
2120 | if (!x) | |
2121 | goto nomem; | |
2122 | ||
2123 | xfrm_mark_get(attrs, &mark); | |
2124 | ||
2125 | err = verify_newpolicy_info(&ua->policy); | |
2126 | if (err) | |
2127 | goto free_state; | |
2128 | ||
2129 | /* build an XP */ | |
2130 | xp = xfrm_policy_construct(net, &ua->policy, attrs, &err); | |
2131 | if (!xp) | |
2132 | goto free_state; | |
2133 | ||
2134 | memcpy(&x->id, &ua->id, sizeof(ua->id)); | |
2135 | memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); | |
2136 | memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); | |
2137 | xp->mark.m = x->mark.m = mark.m; | |
2138 | xp->mark.v = x->mark.v = mark.v; | |
2139 | ut = nla_data(rt); | |
2140 | /* extract the templates and for each call km_key */ | |
2141 | for (i = 0; i < xp->xfrm_nr; i++, ut++) { | |
2142 | struct xfrm_tmpl *t = &xp->xfrm_vec[i]; | |
2143 | memcpy(&x->id, &t->id, sizeof(x->id)); | |
2144 | x->props.mode = t->mode; | |
2145 | x->props.reqid = t->reqid; | |
2146 | x->props.family = ut->family; | |
2147 | t->aalgos = ua->aalgos; | |
2148 | t->ealgos = ua->ealgos; | |
2149 | t->calgos = ua->calgos; | |
2150 | err = km_query(x, t, xp); | |
2151 | ||
2152 | } | |
2153 | ||
2154 | kfree(x); | |
2155 | kfree(xp); | |
2156 | ||
2157 | return 0; | |
2158 | ||
2159 | free_state: | |
2160 | kfree(x); | |
2161 | nomem: | |
2162 | return err; | |
2163 | } | |
2164 | ||
2165 | #ifdef CONFIG_XFRM_MIGRATE | |
2166 | static int copy_from_user_migrate(struct xfrm_migrate *ma, | |
2167 | struct xfrm_kmaddress *k, | |
2168 | struct nlattr **attrs, int *num) | |
2169 | { | |
2170 | struct nlattr *rt = attrs[XFRMA_MIGRATE]; | |
2171 | struct xfrm_user_migrate *um; | |
2172 | int i, num_migrate; | |
2173 | ||
2174 | if (k != NULL) { | |
2175 | struct xfrm_user_kmaddress *uk; | |
2176 | ||
2177 | uk = nla_data(attrs[XFRMA_KMADDRESS]); | |
2178 | memcpy(&k->local, &uk->local, sizeof(k->local)); | |
2179 | memcpy(&k->remote, &uk->remote, sizeof(k->remote)); | |
2180 | k->family = uk->family; | |
2181 | k->reserved = uk->reserved; | |
2182 | } | |
2183 | ||
2184 | um = nla_data(rt); | |
2185 | num_migrate = nla_len(rt) / sizeof(*um); | |
2186 | ||
2187 | if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) | |
2188 | return -EINVAL; | |
2189 | ||
2190 | for (i = 0; i < num_migrate; i++, um++, ma++) { | |
2191 | memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); | |
2192 | memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); | |
2193 | memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); | |
2194 | memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); | |
2195 | ||
2196 | ma->proto = um->proto; | |
2197 | ma->mode = um->mode; | |
2198 | ma->reqid = um->reqid; | |
2199 | ||
2200 | ma->old_family = um->old_family; | |
2201 | ma->new_family = um->new_family; | |
2202 | } | |
2203 | ||
2204 | *num = i; | |
2205 | return 0; | |
2206 | } | |
2207 | ||
2208 | static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2209 | struct nlattr **attrs) | |
2210 | { | |
2211 | struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); | |
2212 | struct xfrm_migrate m[XFRM_MAX_DEPTH]; | |
2213 | struct xfrm_kmaddress km, *kmp; | |
2214 | u8 type; | |
2215 | int err; | |
2216 | int n = 0; | |
2217 | struct net *net = sock_net(skb->sk); | |
2218 | ||
2219 | if (attrs[XFRMA_MIGRATE] == NULL) | |
2220 | return -EINVAL; | |
2221 | ||
2222 | kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; | |
2223 | ||
2224 | err = copy_from_user_policy_type(&type, attrs); | |
2225 | if (err) | |
2226 | return err; | |
2227 | ||
2228 | err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); | |
2229 | if (err) | |
2230 | return err; | |
2231 | ||
2232 | if (!n) | |
2233 | return 0; | |
2234 | ||
2235 | xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net); | |
2236 | ||
2237 | return 0; | |
2238 | } | |
2239 | #else | |
2240 | static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2241 | struct nlattr **attrs) | |
2242 | { | |
2243 | return -ENOPROTOOPT; | |
2244 | } | |
2245 | #endif | |
2246 | ||
2247 | #ifdef CONFIG_XFRM_MIGRATE | |
2248 | static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) | |
2249 | { | |
2250 | struct xfrm_user_migrate um; | |
2251 | ||
2252 | memset(&um, 0, sizeof(um)); | |
2253 | um.proto = m->proto; | |
2254 | um.mode = m->mode; | |
2255 | um.reqid = m->reqid; | |
2256 | um.old_family = m->old_family; | |
2257 | memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); | |
2258 | memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); | |
2259 | um.new_family = m->new_family; | |
2260 | memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); | |
2261 | memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); | |
2262 | ||
2263 | return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); | |
2264 | } | |
2265 | ||
2266 | static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) | |
2267 | { | |
2268 | struct xfrm_user_kmaddress uk; | |
2269 | ||
2270 | memset(&uk, 0, sizeof(uk)); | |
2271 | uk.family = k->family; | |
2272 | uk.reserved = k->reserved; | |
2273 | memcpy(&uk.local, &k->local, sizeof(uk.local)); | |
2274 | memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); | |
2275 | ||
2276 | return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); | |
2277 | } | |
2278 | ||
2279 | static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma) | |
2280 | { | |
2281 | return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) | |
2282 | + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) | |
2283 | + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) | |
2284 | + userpolicy_type_attrsize(); | |
2285 | } | |
2286 | ||
2287 | static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, | |
2288 | int num_migrate, const struct xfrm_kmaddress *k, | |
2289 | const struct xfrm_selector *sel, u8 dir, u8 type) | |
2290 | { | |
2291 | const struct xfrm_migrate *mp; | |
2292 | struct xfrm_userpolicy_id *pol_id; | |
2293 | struct nlmsghdr *nlh; | |
2294 | int i, err; | |
2295 | ||
2296 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); | |
2297 | if (nlh == NULL) | |
2298 | return -EMSGSIZE; | |
2299 | ||
2300 | pol_id = nlmsg_data(nlh); | |
2301 | /* copy data from selector, dir, and type to the pol_id */ | |
2302 | memset(pol_id, 0, sizeof(*pol_id)); | |
2303 | memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); | |
2304 | pol_id->dir = dir; | |
2305 | ||
2306 | if (k != NULL) { | |
2307 | err = copy_to_user_kmaddress(k, skb); | |
2308 | if (err) | |
2309 | goto out_cancel; | |
2310 | } | |
2311 | err = copy_to_user_policy_type(type, skb); | |
2312 | if (err) | |
2313 | goto out_cancel; | |
2314 | for (i = 0, mp = m ; i < num_migrate; i++, mp++) { | |
2315 | err = copy_to_user_migrate(mp, skb); | |
2316 | if (err) | |
2317 | goto out_cancel; | |
2318 | } | |
2319 | ||
2320 | nlmsg_end(skb, nlh); | |
2321 | return 0; | |
2322 | ||
2323 | out_cancel: | |
2324 | nlmsg_cancel(skb, nlh); | |
2325 | return err; | |
2326 | } | |
2327 | ||
2328 | static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, | |
2329 | const struct xfrm_migrate *m, int num_migrate, | |
2330 | const struct xfrm_kmaddress *k) | |
2331 | { | |
2332 | struct net *net = &init_net; | |
2333 | struct sk_buff *skb; | |
2334 | ||
2335 | skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC); | |
2336 | if (skb == NULL) | |
2337 | return -ENOMEM; | |
2338 | ||
2339 | /* build migrate */ | |
2340 | if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0) | |
2341 | BUG(); | |
2342 | ||
2343 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); | |
2344 | } | |
2345 | #else | |
2346 | static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, | |
2347 | const struct xfrm_migrate *m, int num_migrate, | |
2348 | const struct xfrm_kmaddress *k) | |
2349 | { | |
2350 | return -ENOPROTOOPT; | |
2351 | } | |
2352 | #endif | |
2353 | ||
2354 | #define XMSGSIZE(type) sizeof(struct type) | |
2355 | ||
2356 | static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { | |
2357 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), | |
2358 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), | |
2359 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), | |
2360 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), | |
2361 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), | |
2362 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), | |
2363 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), | |
2364 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), | |
2365 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), | |
2366 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), | |
2367 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), | |
2368 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), | |
2369 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), | |
2370 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, | |
2371 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), | |
2372 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), | |
2373 | [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), | |
2374 | [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), | |
2375 | [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), | |
2376 | [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), | |
2377 | [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), | |
2378 | }; | |
2379 | ||
2380 | #undef XMSGSIZE | |
2381 | ||
2382 | static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { | |
2383 | [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, | |
2384 | [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, | |
2385 | [XFRMA_LASTUSED] = { .type = NLA_U64}, | |
2386 | [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, | |
2387 | [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, | |
2388 | [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, | |
2389 | [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, | |
2390 | [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, | |
2391 | [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, | |
2392 | [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, | |
2393 | [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) }, | |
2394 | [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, | |
2395 | [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, | |
2396 | [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, | |
2397 | [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, | |
2398 | [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, | |
2399 | [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, | |
2400 | [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, | |
2401 | [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, | |
2402 | [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, | |
2403 | [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, | |
2404 | [XFRMA_TFCPAD] = { .type = NLA_U32 }, | |
2405 | [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, | |
2406 | [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, | |
2407 | [XFRMA_PROTO] = { .type = NLA_U8 }, | |
2408 | [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, | |
2409 | }; | |
2410 | ||
2411 | static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { | |
2412 | [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, | |
2413 | [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, | |
2414 | }; | |
2415 | ||
2416 | static const struct xfrm_link { | |
2417 | int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); | |
2418 | int (*dump)(struct sk_buff *, struct netlink_callback *); | |
2419 | int (*done)(struct netlink_callback *); | |
2420 | const struct nla_policy *nla_pol; | |
2421 | int nla_max; | |
2422 | } xfrm_dispatch[XFRM_NR_MSGTYPES] = { | |
2423 | [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, | |
2424 | [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, | |
2425 | [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, | |
2426 | .dump = xfrm_dump_sa, | |
2427 | .done = xfrm_dump_sa_done }, | |
2428 | [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, | |
2429 | [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, | |
2430 | [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, | |
2431 | .dump = xfrm_dump_policy, | |
2432 | .done = xfrm_dump_policy_done }, | |
2433 | [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, | |
2434 | [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, | |
2435 | [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, | |
2436 | [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, | |
2437 | [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, | |
2438 | [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, | |
2439 | [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, | |
2440 | [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, | |
2441 | [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, | |
2442 | [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, | |
2443 | [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, | |
2444 | [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, | |
2445 | [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, | |
2446 | .nla_pol = xfrma_spd_policy, | |
2447 | .nla_max = XFRMA_SPD_MAX }, | |
2448 | [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, | |
2449 | }; | |
2450 | ||
2451 | static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
2452 | { | |
2453 | struct net *net = sock_net(skb->sk); | |
2454 | struct nlattr *attrs[XFRMA_MAX+1]; | |
2455 | const struct xfrm_link *link; | |
2456 | int type, err; | |
2457 | ||
2458 | #ifdef CONFIG_COMPAT | |
2459 | if (in_compat_syscall()) | |
2460 | return -EOPNOTSUPP; | |
2461 | #endif | |
2462 | ||
2463 | type = nlh->nlmsg_type; | |
2464 | if (type > XFRM_MSG_MAX) | |
2465 | return -EINVAL; | |
2466 | ||
2467 | type -= XFRM_MSG_BASE; | |
2468 | link = &xfrm_dispatch[type]; | |
2469 | ||
2470 | /* All operations require privileges, even GET */ | |
2471 | if (!netlink_net_capable(skb, CAP_NET_ADMIN)) | |
2472 | return -EPERM; | |
2473 | ||
2474 | if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || | |
2475 | type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && | |
2476 | (nlh->nlmsg_flags & NLM_F_DUMP)) { | |
2477 | if (link->dump == NULL) | |
2478 | return -EINVAL; | |
2479 | ||
2480 | { | |
2481 | struct netlink_dump_control c = { | |
2482 | .dump = link->dump, | |
2483 | .done = link->done, | |
2484 | }; | |
2485 | return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); | |
2486 | } | |
2487 | } | |
2488 | ||
2489 | err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, | |
2490 | link->nla_max ? : XFRMA_MAX, | |
2491 | link->nla_pol ? : xfrma_policy); | |
2492 | if (err < 0) | |
2493 | return err; | |
2494 | ||
2495 | if (link->doit == NULL) | |
2496 | return -EINVAL; | |
2497 | ||
2498 | return link->doit(skb, nlh, attrs); | |
2499 | } | |
2500 | ||
2501 | static void xfrm_netlink_rcv(struct sk_buff *skb) | |
2502 | { | |
2503 | struct net *net = sock_net(skb->sk); | |
2504 | ||
2505 | mutex_lock(&net->xfrm.xfrm_cfg_mutex); | |
2506 | netlink_rcv_skb(skb, &xfrm_user_rcv_msg); | |
2507 | mutex_unlock(&net->xfrm.xfrm_cfg_mutex); | |
2508 | } | |
2509 | ||
2510 | static inline size_t xfrm_expire_msgsize(void) | |
2511 | { | |
2512 | return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) | |
2513 | + nla_total_size(sizeof(struct xfrm_mark)); | |
2514 | } | |
2515 | ||
2516 | static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) | |
2517 | { | |
2518 | struct xfrm_user_expire *ue; | |
2519 | struct nlmsghdr *nlh; | |
2520 | int err; | |
2521 | ||
2522 | nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); | |
2523 | if (nlh == NULL) | |
2524 | return -EMSGSIZE; | |
2525 | ||
2526 | ue = nlmsg_data(nlh); | |
2527 | copy_to_user_state(x, &ue->state); | |
2528 | ue->hard = (c->data.hard != 0) ? 1 : 0; | |
2529 | ||
2530 | err = xfrm_mark_put(skb, &x->mark); | |
2531 | if (err) | |
2532 | return err; | |
2533 | ||
2534 | nlmsg_end(skb, nlh); | |
2535 | return 0; | |
2536 | } | |
2537 | ||
2538 | static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) | |
2539 | { | |
2540 | struct net *net = xs_net(x); | |
2541 | struct sk_buff *skb; | |
2542 | ||
2543 | skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); | |
2544 | if (skb == NULL) | |
2545 | return -ENOMEM; | |
2546 | ||
2547 | if (build_expire(skb, x, c) < 0) { | |
2548 | kfree_skb(skb); | |
2549 | return -EMSGSIZE; | |
2550 | } | |
2551 | ||
2552 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); | |
2553 | } | |
2554 | ||
2555 | static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) | |
2556 | { | |
2557 | struct net *net = xs_net(x); | |
2558 | struct sk_buff *skb; | |
2559 | ||
2560 | skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); | |
2561 | if (skb == NULL) | |
2562 | return -ENOMEM; | |
2563 | ||
2564 | if (build_aevent(skb, x, c) < 0) | |
2565 | BUG(); | |
2566 | ||
2567 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); | |
2568 | } | |
2569 | ||
2570 | static int xfrm_notify_sa_flush(const struct km_event *c) | |
2571 | { | |
2572 | struct net *net = c->net; | |
2573 | struct xfrm_usersa_flush *p; | |
2574 | struct nlmsghdr *nlh; | |
2575 | struct sk_buff *skb; | |
2576 | int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); | |
2577 | ||
2578 | skb = nlmsg_new(len, GFP_ATOMIC); | |
2579 | if (skb == NULL) | |
2580 | return -ENOMEM; | |
2581 | ||
2582 | nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); | |
2583 | if (nlh == NULL) { | |
2584 | kfree_skb(skb); | |
2585 | return -EMSGSIZE; | |
2586 | } | |
2587 | ||
2588 | p = nlmsg_data(nlh); | |
2589 | p->proto = c->data.proto; | |
2590 | ||
2591 | nlmsg_end(skb, nlh); | |
2592 | ||
2593 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); | |
2594 | } | |
2595 | ||
2596 | static inline size_t xfrm_sa_len(struct xfrm_state *x) | |
2597 | { | |
2598 | size_t l = 0; | |
2599 | if (x->aead) | |
2600 | l += nla_total_size(aead_len(x->aead)); | |
2601 | if (x->aalg) { | |
2602 | l += nla_total_size(sizeof(struct xfrm_algo) + | |
2603 | (x->aalg->alg_key_len + 7) / 8); | |
2604 | l += nla_total_size(xfrm_alg_auth_len(x->aalg)); | |
2605 | } | |
2606 | if (x->ealg) | |
2607 | l += nla_total_size(xfrm_alg_len(x->ealg)); | |
2608 | if (x->calg) | |
2609 | l += nla_total_size(sizeof(*x->calg)); | |
2610 | if (x->encap) | |
2611 | l += nla_total_size(sizeof(*x->encap)); | |
2612 | if (x->tfcpad) | |
2613 | l += nla_total_size(sizeof(x->tfcpad)); | |
2614 | if (x->replay_esn) | |
2615 | l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); | |
2616 | else | |
2617 | l += nla_total_size(sizeof(struct xfrm_replay_state)); | |
2618 | if (x->security) | |
2619 | l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + | |
2620 | x->security->ctx_len); | |
2621 | if (x->coaddr) | |
2622 | l += nla_total_size(sizeof(*x->coaddr)); | |
2623 | if (x->props.extra_flags) | |
2624 | l += nla_total_size(sizeof(x->props.extra_flags)); | |
2625 | ||
2626 | /* Must count x->lastused as it may become non-zero behind our back. */ | |
2627 | l += nla_total_size_64bit(sizeof(u64)); | |
2628 | ||
2629 | return l; | |
2630 | } | |
2631 | ||
2632 | static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) | |
2633 | { | |
2634 | struct net *net = xs_net(x); | |
2635 | struct xfrm_usersa_info *p; | |
2636 | struct xfrm_usersa_id *id; | |
2637 | struct nlmsghdr *nlh; | |
2638 | struct sk_buff *skb; | |
2639 | int len = xfrm_sa_len(x); | |
2640 | int headlen, err; | |
2641 | ||
2642 | headlen = sizeof(*p); | |
2643 | if (c->event == XFRM_MSG_DELSA) { | |
2644 | len += nla_total_size(headlen); | |
2645 | headlen = sizeof(*id); | |
2646 | len += nla_total_size(sizeof(struct xfrm_mark)); | |
2647 | } | |
2648 | len += NLMSG_ALIGN(headlen); | |
2649 | ||
2650 | skb = nlmsg_new(len, GFP_ATOMIC); | |
2651 | if (skb == NULL) | |
2652 | return -ENOMEM; | |
2653 | ||
2654 | nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); | |
2655 | err = -EMSGSIZE; | |
2656 | if (nlh == NULL) | |
2657 | goto out_free_skb; | |
2658 | ||
2659 | p = nlmsg_data(nlh); | |
2660 | if (c->event == XFRM_MSG_DELSA) { | |
2661 | struct nlattr *attr; | |
2662 | ||
2663 | id = nlmsg_data(nlh); | |
2664 | memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); | |
2665 | id->spi = x->id.spi; | |
2666 | id->family = x->props.family; | |
2667 | id->proto = x->id.proto; | |
2668 | ||
2669 | attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); | |
2670 | err = -EMSGSIZE; | |
2671 | if (attr == NULL) | |
2672 | goto out_free_skb; | |
2673 | ||
2674 | p = nla_data(attr); | |
2675 | } | |
2676 | err = copy_to_user_state_extra(x, p, skb); | |
2677 | if (err) | |
2678 | goto out_free_skb; | |
2679 | ||
2680 | nlmsg_end(skb, nlh); | |
2681 | ||
2682 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); | |
2683 | ||
2684 | out_free_skb: | |
2685 | kfree_skb(skb); | |
2686 | return err; | |
2687 | } | |
2688 | ||
2689 | static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) | |
2690 | { | |
2691 | ||
2692 | switch (c->event) { | |
2693 | case XFRM_MSG_EXPIRE: | |
2694 | return xfrm_exp_state_notify(x, c); | |
2695 | case XFRM_MSG_NEWAE: | |
2696 | return xfrm_aevent_state_notify(x, c); | |
2697 | case XFRM_MSG_DELSA: | |
2698 | case XFRM_MSG_UPDSA: | |
2699 | case XFRM_MSG_NEWSA: | |
2700 | return xfrm_notify_sa(x, c); | |
2701 | case XFRM_MSG_FLUSHSA: | |
2702 | return xfrm_notify_sa_flush(c); | |
2703 | default: | |
2704 | printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", | |
2705 | c->event); | |
2706 | break; | |
2707 | } | |
2708 | ||
2709 | return 0; | |
2710 | ||
2711 | } | |
2712 | ||
2713 | static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x, | |
2714 | struct xfrm_policy *xp) | |
2715 | { | |
2716 | return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) | |
2717 | + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) | |
2718 | + nla_total_size(sizeof(struct xfrm_mark)) | |
2719 | + nla_total_size(xfrm_user_sec_ctx_size(x->security)) | |
2720 | + userpolicy_type_attrsize(); | |
2721 | } | |
2722 | ||
2723 | static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, | |
2724 | struct xfrm_tmpl *xt, struct xfrm_policy *xp) | |
2725 | { | |
2726 | __u32 seq = xfrm_get_acqseq(); | |
2727 | struct xfrm_user_acquire *ua; | |
2728 | struct nlmsghdr *nlh; | |
2729 | int err; | |
2730 | ||
2731 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); | |
2732 | if (nlh == NULL) | |
2733 | return -EMSGSIZE; | |
2734 | ||
2735 | ua = nlmsg_data(nlh); | |
2736 | memcpy(&ua->id, &x->id, sizeof(ua->id)); | |
2737 | memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); | |
2738 | memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); | |
2739 | copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); | |
2740 | ua->aalgos = xt->aalgos; | |
2741 | ua->ealgos = xt->ealgos; | |
2742 | ua->calgos = xt->calgos; | |
2743 | ua->seq = x->km.seq = seq; | |
2744 | ||
2745 | err = copy_to_user_tmpl(xp, skb); | |
2746 | if (!err) | |
2747 | err = copy_to_user_state_sec_ctx(x, skb); | |
2748 | if (!err) | |
2749 | err = copy_to_user_policy_type(xp->type, skb); | |
2750 | if (!err) | |
2751 | err = xfrm_mark_put(skb, &xp->mark); | |
2752 | if (err) { | |
2753 | nlmsg_cancel(skb, nlh); | |
2754 | return err; | |
2755 | } | |
2756 | ||
2757 | nlmsg_end(skb, nlh); | |
2758 | return 0; | |
2759 | } | |
2760 | ||
2761 | static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, | |
2762 | struct xfrm_policy *xp) | |
2763 | { | |
2764 | struct net *net = xs_net(x); | |
2765 | struct sk_buff *skb; | |
2766 | ||
2767 | skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); | |
2768 | if (skb == NULL) | |
2769 | return -ENOMEM; | |
2770 | ||
2771 | if (build_acquire(skb, x, xt, xp) < 0) | |
2772 | BUG(); | |
2773 | ||
2774 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); | |
2775 | } | |
2776 | ||
2777 | /* User gives us xfrm_user_policy_info followed by an array of 0 | |
2778 | * or more templates. | |
2779 | */ | |
2780 | static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, | |
2781 | u8 *data, int len, int *dir) | |
2782 | { | |
2783 | struct net *net = sock_net(sk); | |
2784 | struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; | |
2785 | struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); | |
2786 | struct xfrm_policy *xp; | |
2787 | int nr; | |
2788 | ||
2789 | switch (sk->sk_family) { | |
2790 | case AF_INET: | |
2791 | if (opt != IP_XFRM_POLICY) { | |
2792 | *dir = -EOPNOTSUPP; | |
2793 | return NULL; | |
2794 | } | |
2795 | break; | |
2796 | #if IS_ENABLED(CONFIG_IPV6) | |
2797 | case AF_INET6: | |
2798 | if (opt != IPV6_XFRM_POLICY) { | |
2799 | *dir = -EOPNOTSUPP; | |
2800 | return NULL; | |
2801 | } | |
2802 | break; | |
2803 | #endif | |
2804 | default: | |
2805 | *dir = -EINVAL; | |
2806 | return NULL; | |
2807 | } | |
2808 | ||
2809 | *dir = -EINVAL; | |
2810 | ||
2811 | if (len < sizeof(*p) || | |
2812 | verify_newpolicy_info(p)) | |
2813 | return NULL; | |
2814 | ||
2815 | nr = ((len - sizeof(*p)) / sizeof(*ut)); | |
2816 | if (validate_tmpl(nr, ut, p->sel.family)) | |
2817 | return NULL; | |
2818 | ||
2819 | if (p->dir > XFRM_POLICY_OUT) | |
2820 | return NULL; | |
2821 | ||
2822 | xp = xfrm_policy_alloc(net, GFP_ATOMIC); | |
2823 | if (xp == NULL) { | |
2824 | *dir = -ENOBUFS; | |
2825 | return NULL; | |
2826 | } | |
2827 | ||
2828 | copy_from_user_policy(xp, p); | |
2829 | xp->type = XFRM_POLICY_TYPE_MAIN; | |
2830 | copy_templates(xp, ut, nr); | |
2831 | ||
2832 | *dir = p->dir; | |
2833 | ||
2834 | return xp; | |
2835 | } | |
2836 | ||
2837 | static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp) | |
2838 | { | |
2839 | return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) | |
2840 | + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) | |
2841 | + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) | |
2842 | + nla_total_size(sizeof(struct xfrm_mark)) | |
2843 | + userpolicy_type_attrsize(); | |
2844 | } | |
2845 | ||
2846 | static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, | |
2847 | int dir, const struct km_event *c) | |
2848 | { | |
2849 | struct xfrm_user_polexpire *upe; | |
2850 | int hard = c->data.hard; | |
2851 | struct nlmsghdr *nlh; | |
2852 | int err; | |
2853 | ||
2854 | nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); | |
2855 | if (nlh == NULL) | |
2856 | return -EMSGSIZE; | |
2857 | ||
2858 | upe = nlmsg_data(nlh); | |
2859 | copy_to_user_policy(xp, &upe->pol, dir); | |
2860 | err = copy_to_user_tmpl(xp, skb); | |
2861 | if (!err) | |
2862 | err = copy_to_user_sec_ctx(xp, skb); | |
2863 | if (!err) | |
2864 | err = copy_to_user_policy_type(xp->type, skb); | |
2865 | if (!err) | |
2866 | err = xfrm_mark_put(skb, &xp->mark); | |
2867 | if (err) { | |
2868 | nlmsg_cancel(skb, nlh); | |
2869 | return err; | |
2870 | } | |
2871 | upe->hard = !!hard; | |
2872 | ||
2873 | nlmsg_end(skb, nlh); | |
2874 | return 0; | |
2875 | } | |
2876 | ||
2877 | static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) | |
2878 | { | |
2879 | struct net *net = xp_net(xp); | |
2880 | struct sk_buff *skb; | |
2881 | ||
2882 | skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); | |
2883 | if (skb == NULL) | |
2884 | return -ENOMEM; | |
2885 | ||
2886 | if (build_polexpire(skb, xp, dir, c) < 0) | |
2887 | BUG(); | |
2888 | ||
2889 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); | |
2890 | } | |
2891 | ||
2892 | static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) | |
2893 | { | |
2894 | int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); | |
2895 | struct net *net = xp_net(xp); | |
2896 | struct xfrm_userpolicy_info *p; | |
2897 | struct xfrm_userpolicy_id *id; | |
2898 | struct nlmsghdr *nlh; | |
2899 | struct sk_buff *skb; | |
2900 | int headlen, err; | |
2901 | ||
2902 | headlen = sizeof(*p); | |
2903 | if (c->event == XFRM_MSG_DELPOLICY) { | |
2904 | len += nla_total_size(headlen); | |
2905 | headlen = sizeof(*id); | |
2906 | } | |
2907 | len += userpolicy_type_attrsize(); | |
2908 | len += nla_total_size(sizeof(struct xfrm_mark)); | |
2909 | len += NLMSG_ALIGN(headlen); | |
2910 | ||
2911 | skb = nlmsg_new(len, GFP_ATOMIC); | |
2912 | if (skb == NULL) | |
2913 | return -ENOMEM; | |
2914 | ||
2915 | nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); | |
2916 | err = -EMSGSIZE; | |
2917 | if (nlh == NULL) | |
2918 | goto out_free_skb; | |
2919 | ||
2920 | p = nlmsg_data(nlh); | |
2921 | if (c->event == XFRM_MSG_DELPOLICY) { | |
2922 | struct nlattr *attr; | |
2923 | ||
2924 | id = nlmsg_data(nlh); | |
2925 | memset(id, 0, sizeof(*id)); | |
2926 | id->dir = dir; | |
2927 | if (c->data.byid) | |
2928 | id->index = xp->index; | |
2929 | else | |
2930 | memcpy(&id->sel, &xp->selector, sizeof(id->sel)); | |
2931 | ||
2932 | attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); | |
2933 | err = -EMSGSIZE; | |
2934 | if (attr == NULL) | |
2935 | goto out_free_skb; | |
2936 | ||
2937 | p = nla_data(attr); | |
2938 | } | |
2939 | ||
2940 | copy_to_user_policy(xp, p, dir); | |
2941 | err = copy_to_user_tmpl(xp, skb); | |
2942 | if (!err) | |
2943 | err = copy_to_user_policy_type(xp->type, skb); | |
2944 | if (!err) | |
2945 | err = xfrm_mark_put(skb, &xp->mark); | |
2946 | if (err) | |
2947 | goto out_free_skb; | |
2948 | ||
2949 | nlmsg_end(skb, nlh); | |
2950 | ||
2951 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); | |
2952 | ||
2953 | out_free_skb: | |
2954 | kfree_skb(skb); | |
2955 | return err; | |
2956 | } | |
2957 | ||
2958 | static int xfrm_notify_policy_flush(const struct km_event *c) | |
2959 | { | |
2960 | struct net *net = c->net; | |
2961 | struct nlmsghdr *nlh; | |
2962 | struct sk_buff *skb; | |
2963 | int err; | |
2964 | ||
2965 | skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); | |
2966 | if (skb == NULL) | |
2967 | return -ENOMEM; | |
2968 | ||
2969 | nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); | |
2970 | err = -EMSGSIZE; | |
2971 | if (nlh == NULL) | |
2972 | goto out_free_skb; | |
2973 | err = copy_to_user_policy_type(c->data.type, skb); | |
2974 | if (err) | |
2975 | goto out_free_skb; | |
2976 | ||
2977 | nlmsg_end(skb, nlh); | |
2978 | ||
2979 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); | |
2980 | ||
2981 | out_free_skb: | |
2982 | kfree_skb(skb); | |
2983 | return err; | |
2984 | } | |
2985 | ||
2986 | static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) | |
2987 | { | |
2988 | ||
2989 | switch (c->event) { | |
2990 | case XFRM_MSG_NEWPOLICY: | |
2991 | case XFRM_MSG_UPDPOLICY: | |
2992 | case XFRM_MSG_DELPOLICY: | |
2993 | return xfrm_notify_policy(xp, dir, c); | |
2994 | case XFRM_MSG_FLUSHPOLICY: | |
2995 | return xfrm_notify_policy_flush(c); | |
2996 | case XFRM_MSG_POLEXPIRE: | |
2997 | return xfrm_exp_policy_notify(xp, dir, c); | |
2998 | default: | |
2999 | printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", | |
3000 | c->event); | |
3001 | } | |
3002 | ||
3003 | return 0; | |
3004 | ||
3005 | } | |
3006 | ||
3007 | static inline size_t xfrm_report_msgsize(void) | |
3008 | { | |
3009 | return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); | |
3010 | } | |
3011 | ||
3012 | static int build_report(struct sk_buff *skb, u8 proto, | |
3013 | struct xfrm_selector *sel, xfrm_address_t *addr) | |
3014 | { | |
3015 | struct xfrm_user_report *ur; | |
3016 | struct nlmsghdr *nlh; | |
3017 | ||
3018 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); | |
3019 | if (nlh == NULL) | |
3020 | return -EMSGSIZE; | |
3021 | ||
3022 | ur = nlmsg_data(nlh); | |
3023 | ur->proto = proto; | |
3024 | memcpy(&ur->sel, sel, sizeof(ur->sel)); | |
3025 | ||
3026 | if (addr) { | |
3027 | int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); | |
3028 | if (err) { | |
3029 | nlmsg_cancel(skb, nlh); | |
3030 | return err; | |
3031 | } | |
3032 | } | |
3033 | nlmsg_end(skb, nlh); | |
3034 | return 0; | |
3035 | } | |
3036 | ||
3037 | static int xfrm_send_report(struct net *net, u8 proto, | |
3038 | struct xfrm_selector *sel, xfrm_address_t *addr) | |
3039 | { | |
3040 | struct sk_buff *skb; | |
3041 | ||
3042 | skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); | |
3043 | if (skb == NULL) | |
3044 | return -ENOMEM; | |
3045 | ||
3046 | if (build_report(skb, proto, sel, addr) < 0) | |
3047 | BUG(); | |
3048 | ||
3049 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); | |
3050 | } | |
3051 | ||
3052 | static inline size_t xfrm_mapping_msgsize(void) | |
3053 | { | |
3054 | return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); | |
3055 | } | |
3056 | ||
3057 | static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, | |
3058 | xfrm_address_t *new_saddr, __be16 new_sport) | |
3059 | { | |
3060 | struct xfrm_user_mapping *um; | |
3061 | struct nlmsghdr *nlh; | |
3062 | ||
3063 | nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); | |
3064 | if (nlh == NULL) | |
3065 | return -EMSGSIZE; | |
3066 | ||
3067 | um = nlmsg_data(nlh); | |
3068 | ||
3069 | memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); | |
3070 | um->id.spi = x->id.spi; | |
3071 | um->id.family = x->props.family; | |
3072 | um->id.proto = x->id.proto; | |
3073 | memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); | |
3074 | memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); | |
3075 | um->new_sport = new_sport; | |
3076 | um->old_sport = x->encap->encap_sport; | |
3077 | um->reqid = x->props.reqid; | |
3078 | ||
3079 | nlmsg_end(skb, nlh); | |
3080 | return 0; | |
3081 | } | |
3082 | ||
3083 | static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, | |
3084 | __be16 sport) | |
3085 | { | |
3086 | struct net *net = xs_net(x); | |
3087 | struct sk_buff *skb; | |
3088 | ||
3089 | if (x->id.proto != IPPROTO_ESP) | |
3090 | return -EINVAL; | |
3091 | ||
3092 | if (!x->encap) | |
3093 | return -EINVAL; | |
3094 | ||
3095 | skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); | |
3096 | if (skb == NULL) | |
3097 | return -ENOMEM; | |
3098 | ||
3099 | if (build_mapping(skb, x, ipaddr, sport) < 0) | |
3100 | BUG(); | |
3101 | ||
3102 | return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); | |
3103 | } | |
3104 | ||
3105 | static bool xfrm_is_alive(const struct km_event *c) | |
3106 | { | |
3107 | return (bool)xfrm_acquire_is_on(c->net); | |
3108 | } | |
3109 | ||
3110 | static struct xfrm_mgr netlink_mgr = { | |
3111 | .id = "netlink", | |
3112 | .notify = xfrm_send_state_notify, | |
3113 | .acquire = xfrm_send_acquire, | |
3114 | .compile_policy = xfrm_compile_policy, | |
3115 | .notify_policy = xfrm_send_policy_notify, | |
3116 | .report = xfrm_send_report, | |
3117 | .migrate = xfrm_send_migrate, | |
3118 | .new_mapping = xfrm_send_mapping, | |
3119 | .is_alive = xfrm_is_alive, | |
3120 | }; | |
3121 | ||
3122 | static int __net_init xfrm_user_net_init(struct net *net) | |
3123 | { | |
3124 | struct sock *nlsk; | |
3125 | struct netlink_kernel_cfg cfg = { | |
3126 | .groups = XFRMNLGRP_MAX, | |
3127 | .input = xfrm_netlink_rcv, | |
3128 | }; | |
3129 | ||
3130 | nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); | |
3131 | if (nlsk == NULL) | |
3132 | return -ENOMEM; | |
3133 | net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ | |
3134 | rcu_assign_pointer(net->xfrm.nlsk, nlsk); | |
3135 | return 0; | |
3136 | } | |
3137 | ||
3138 | static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) | |
3139 | { | |
3140 | struct net *net; | |
3141 | list_for_each_entry(net, net_exit_list, exit_list) | |
3142 | RCU_INIT_POINTER(net->xfrm.nlsk, NULL); | |
3143 | synchronize_net(); | |
3144 | list_for_each_entry(net, net_exit_list, exit_list) | |
3145 | netlink_kernel_release(net->xfrm.nlsk_stash); | |
3146 | } | |
3147 | ||
3148 | static struct pernet_operations xfrm_user_net_ops = { | |
3149 | .init = xfrm_user_net_init, | |
3150 | .exit_batch = xfrm_user_net_exit, | |
3151 | }; | |
3152 | ||
3153 | static int __init xfrm_user_init(void) | |
3154 | { | |
3155 | int rv; | |
3156 | ||
3157 | printk(KERN_INFO "Initializing XFRM netlink socket\n"); | |
3158 | ||
3159 | rv = register_pernet_subsys(&xfrm_user_net_ops); | |
3160 | if (rv < 0) | |
3161 | return rv; | |
3162 | rv = xfrm_register_km(&netlink_mgr); | |
3163 | if (rv < 0) | |
3164 | unregister_pernet_subsys(&xfrm_user_net_ops); | |
3165 | return rv; | |
3166 | } | |
3167 | ||
3168 | static void __exit xfrm_user_exit(void) | |
3169 | { | |
3170 | xfrm_unregister_km(&netlink_mgr); | |
3171 | unregister_pernet_subsys(&xfrm_user_net_ops); | |
3172 | } | |
3173 | ||
3174 | module_init(xfrm_user_init); | |
3175 | module_exit(xfrm_user_exit); | |
3176 | MODULE_LICENSE("GPL"); | |
3177 | MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); | |
3178 |