1 // SPDX-License-Identifier: GPL-2.0-only
2 /* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
14 #include <linux/compat.h>
15 #include <linux/crypto.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/socket.h>
21 #include <linux/string.h>
22 #include <linux/net.h>
23 #include <linux/skbuff.h>
24 #include <linux/pfkeyv2.h>
25 #include <linux/ipsec.h>
26 #include <linux/init.h>
27 #include <linux/security.h>
28 #include <net/sock.h>
29 #include <net/xfrm.h>
30 #include <net/netlink.h>
31 #include <net/ah.h>
32 #include <linux/uaccess.h>
33 #if IS_ENABLED(CONFIG_IPV6)
34 #include <linux/in6.h>
35 #endif
36 #include <asm/unaligned.h>
37
verify_one_alg(struct nlattr ** attrs,enum xfrm_attr_type_t type,struct netlink_ext_ack * extack)38 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type,
39 struct netlink_ext_ack *extack)
40 {
41 struct nlattr *rt = attrs[type];
42 struct xfrm_algo *algp;
43
44 if (!rt)
45 return 0;
46
47 algp = nla_data(rt);
48 if (nla_len(rt) < (int)xfrm_alg_len(algp)) {
49 NL_SET_ERR_MSG(extack, "Invalid AUTH/CRYPT/COMP attribute length");
50 return -EINVAL;
51 }
52
53 switch (type) {
54 case XFRMA_ALG_AUTH:
55 case XFRMA_ALG_CRYPT:
56 case XFRMA_ALG_COMP:
57 break;
58
59 default:
60 NL_SET_ERR_MSG(extack, "Invalid algorithm attribute type");
61 return -EINVAL;
62 }
63
64 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
65 return 0;
66 }
67
verify_auth_trunc(struct nlattr ** attrs,struct netlink_ext_ack * extack)68 static int verify_auth_trunc(struct nlattr **attrs,
69 struct netlink_ext_ack *extack)
70 {
71 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
72 struct xfrm_algo_auth *algp;
73
74 if (!rt)
75 return 0;
76
77 algp = nla_data(rt);
78 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) {
79 NL_SET_ERR_MSG(extack, "Invalid AUTH_TRUNC attribute length");
80 return -EINVAL;
81 }
82
83 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
84 return 0;
85 }
86
verify_aead(struct nlattr ** attrs,struct netlink_ext_ack * extack)87 static int verify_aead(struct nlattr **attrs, struct netlink_ext_ack *extack)
88 {
89 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
90 struct xfrm_algo_aead *algp;
91
92 if (!rt)
93 return 0;
94
95 algp = nla_data(rt);
96 if (nla_len(rt) < (int)aead_len(algp)) {
97 NL_SET_ERR_MSG(extack, "Invalid AEAD attribute length");
98 return -EINVAL;
99 }
100
101 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
102 return 0;
103 }
104
verify_one_addr(struct nlattr ** attrs,enum xfrm_attr_type_t type,xfrm_address_t ** addrp)105 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
106 xfrm_address_t **addrp)
107 {
108 struct nlattr *rt = attrs[type];
109
110 if (rt && addrp)
111 *addrp = nla_data(rt);
112 }
113
verify_sec_ctx_len(struct nlattr ** attrs,struct netlink_ext_ack * extack)114 static inline int verify_sec_ctx_len(struct nlattr **attrs, struct netlink_ext_ack *extack)
115 {
116 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
117 struct xfrm_user_sec_ctx *uctx;
118
119 if (!rt)
120 return 0;
121
122 uctx = nla_data(rt);
123 if (uctx->len > nla_len(rt) ||
124 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) {
125 NL_SET_ERR_MSG(extack, "Invalid security context length");
126 return -EINVAL;
127 }
128
129 return 0;
130 }
131
verify_replay(struct xfrm_usersa_info * p,struct nlattr ** attrs,struct netlink_ext_ack * extack)132 static inline int verify_replay(struct xfrm_usersa_info *p,
133 struct nlattr **attrs,
134 struct netlink_ext_ack *extack)
135 {
136 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
137 struct xfrm_replay_state_esn *rs;
138
139 if (!rt) {
140 if (p->flags & XFRM_STATE_ESN) {
141 NL_SET_ERR_MSG(extack, "Missing required attribute for ESN");
142 return -EINVAL;
143 }
144 return 0;
145 }
146
147 rs = nla_data(rt);
148
149 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) {
150 NL_SET_ERR_MSG(extack, "ESN bitmap length must be <= 128");
151 return -EINVAL;
152 }
153
154 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
155 nla_len(rt) != sizeof(*rs)) {
156 NL_SET_ERR_MSG(extack, "ESN attribute is too short to fit the full bitmap length");
157 return -EINVAL;
158 }
159
160 /* As only ESP and AH support ESN feature. */
161 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) {
162 NL_SET_ERR_MSG(extack, "ESN only supported for ESP and AH");
163 return -EINVAL;
164 }
165
166 if (p->replay_window != 0) {
167 NL_SET_ERR_MSG(extack, "ESN not compatible with legacy replay_window");
168 return -EINVAL;
169 }
170
171 return 0;
172 }
173
verify_newsa_info(struct xfrm_usersa_info * p,struct nlattr ** attrs,struct netlink_ext_ack * extack)174 static int verify_newsa_info(struct xfrm_usersa_info *p,
175 struct nlattr **attrs,
176 struct netlink_ext_ack *extack)
177 {
178 int err;
179
180 err = -EINVAL;
181 switch (p->family) {
182 case AF_INET:
183 break;
184
185 case AF_INET6:
186 #if IS_ENABLED(CONFIG_IPV6)
187 break;
188 #else
189 err = -EAFNOSUPPORT;
190 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
191 goto out;
192 #endif
193
194 default:
195 NL_SET_ERR_MSG(extack, "Invalid address family");
196 goto out;
197 }
198
199 switch (p->sel.family) {
200 case AF_UNSPEC:
201 break;
202
203 case AF_INET:
204 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
205 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
206 goto out;
207 }
208
209 break;
210
211 case AF_INET6:
212 #if IS_ENABLED(CONFIG_IPV6)
213 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
214 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
215 goto out;
216 }
217
218 break;
219 #else
220 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
221 err = -EAFNOSUPPORT;
222 goto out;
223 #endif
224
225 default:
226 NL_SET_ERR_MSG(extack, "Invalid address family in selector");
227 goto out;
228 }
229
230 err = -EINVAL;
231 switch (p->id.proto) {
232 case IPPROTO_AH:
233 if (!attrs[XFRMA_ALG_AUTH] &&
234 !attrs[XFRMA_ALG_AUTH_TRUNC]) {
235 NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
236 goto out;
237 }
238
239 if (attrs[XFRMA_ALG_AEAD] ||
240 attrs[XFRMA_ALG_CRYPT] ||
241 attrs[XFRMA_ALG_COMP] ||
242 attrs[XFRMA_TFCPAD]) {
243 NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
244 goto out;
245 }
246 break;
247
248 case IPPROTO_ESP:
249 if (attrs[XFRMA_ALG_COMP]) {
250 NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
251 goto out;
252 }
253
254 if (!attrs[XFRMA_ALG_AUTH] &&
255 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
256 !attrs[XFRMA_ALG_CRYPT] &&
257 !attrs[XFRMA_ALG_AEAD]) {
258 NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
259 goto out;
260 }
261
262 if ((attrs[XFRMA_ALG_AUTH] ||
263 attrs[XFRMA_ALG_AUTH_TRUNC] ||
264 attrs[XFRMA_ALG_CRYPT]) &&
265 attrs[XFRMA_ALG_AEAD]) {
266 NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
267 goto out;
268 }
269
270 if (attrs[XFRMA_TFCPAD] &&
271 p->mode != XFRM_MODE_TUNNEL) {
272 NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
273 goto out;
274 }
275 break;
276
277 case IPPROTO_COMP:
278 if (!attrs[XFRMA_ALG_COMP]) {
279 NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
280 goto out;
281 }
282
283 if (attrs[XFRMA_ALG_AEAD] ||
284 attrs[XFRMA_ALG_AUTH] ||
285 attrs[XFRMA_ALG_AUTH_TRUNC] ||
286 attrs[XFRMA_ALG_CRYPT] ||
287 attrs[XFRMA_TFCPAD]) {
288 NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
289 goto out;
290 }
291
292 if (ntohl(p->id.spi) >= 0x10000) {
293 NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
294 goto out;
295 }
296 break;
297
298 #if IS_ENABLED(CONFIG_IPV6)
299 case IPPROTO_DSTOPTS:
300 case IPPROTO_ROUTING:
301 if (attrs[XFRMA_ALG_COMP] ||
302 attrs[XFRMA_ALG_AUTH] ||
303 attrs[XFRMA_ALG_AUTH_TRUNC] ||
304 attrs[XFRMA_ALG_AEAD] ||
305 attrs[XFRMA_ALG_CRYPT] ||
306 attrs[XFRMA_ENCAP] ||
307 attrs[XFRMA_SEC_CTX] ||
308 attrs[XFRMA_TFCPAD]) {
309 NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
310 goto out;
311 }
312
313 if (!attrs[XFRMA_COADDR]) {
314 NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
315 goto out;
316 }
317 break;
318 #endif
319
320 default:
321 NL_SET_ERR_MSG(extack, "Unsupported protocol");
322 goto out;
323 }
324
325 if ((err = verify_aead(attrs, extack)))
326 goto out;
327 if ((err = verify_auth_trunc(attrs, extack)))
328 goto out;
329 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
330 goto out;
331 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
332 goto out;
333 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
334 goto out;
335 if ((err = verify_sec_ctx_len(attrs, extack)))
336 goto out;
337 if ((err = verify_replay(p, attrs, extack)))
338 goto out;
339
340 err = -EINVAL;
341 switch (p->mode) {
342 case XFRM_MODE_TRANSPORT:
343 case XFRM_MODE_TUNNEL:
344 case XFRM_MODE_ROUTEOPTIMIZATION:
345 case XFRM_MODE_BEET:
346 break;
347
348 default:
349 NL_SET_ERR_MSG(extack, "Unsupported mode");
350 goto out;
351 }
352
353 err = 0;
354
355 if (attrs[XFRMA_MTIMER_THRESH]) {
356 if (!attrs[XFRMA_ENCAP]) {
357 NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
358 err = -EINVAL;
359 goto out;
360 }
361 }
362
363 out:
364 return err;
365 }
366
attach_one_algo(struct xfrm_algo ** algpp,u8 * props,struct xfrm_algo_desc * (* get_byname)(const char *,int),struct nlattr * rta,struct netlink_ext_ack * extack)367 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
368 struct xfrm_algo_desc *(*get_byname)(const char *, int),
369 struct nlattr *rta, struct netlink_ext_ack *extack)
370 {
371 struct xfrm_algo *p, *ualg;
372 struct xfrm_algo_desc *algo;
373
374 if (!rta)
375 return 0;
376
377 ualg = nla_data(rta);
378
379 algo = get_byname(ualg->alg_name, 1);
380 if (!algo) {
381 NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
382 return -ENOSYS;
383 }
384 *props = algo->desc.sadb_alg_id;
385
386 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
387 if (!p)
388 return -ENOMEM;
389
390 strcpy(p->alg_name, algo->name);
391 *algpp = p;
392 return 0;
393 }
394
attach_crypt(struct xfrm_state * x,struct nlattr * rta,struct netlink_ext_ack * extack)395 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
396 struct netlink_ext_ack *extack)
397 {
398 struct xfrm_algo *p, *ualg;
399 struct xfrm_algo_desc *algo;
400
401 if (!rta)
402 return 0;
403
404 ualg = nla_data(rta);
405
406 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
407 if (!algo) {
408 NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
409 return -ENOSYS;
410 }
411 x->props.ealgo = algo->desc.sadb_alg_id;
412
413 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
414 if (!p)
415 return -ENOMEM;
416
417 strcpy(p->alg_name, algo->name);
418 x->ealg = p;
419 x->geniv = algo->uinfo.encr.geniv;
420 return 0;
421 }
422
attach_auth(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta,struct netlink_ext_ack * extack)423 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
424 struct nlattr *rta, struct netlink_ext_ack *extack)
425 {
426 struct xfrm_algo *ualg;
427 struct xfrm_algo_auth *p;
428 struct xfrm_algo_desc *algo;
429
430 if (!rta)
431 return 0;
432
433 ualg = nla_data(rta);
434
435 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
436 if (!algo) {
437 NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
438 return -ENOSYS;
439 }
440 *props = algo->desc.sadb_alg_id;
441
442 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
443 if (!p)
444 return -ENOMEM;
445
446 strcpy(p->alg_name, algo->name);
447 p->alg_key_len = ualg->alg_key_len;
448 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
449 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
450
451 *algpp = p;
452 return 0;
453 }
454
attach_auth_trunc(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta,struct netlink_ext_ack * extack)455 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
456 struct nlattr *rta, struct netlink_ext_ack *extack)
457 {
458 struct xfrm_algo_auth *p, *ualg;
459 struct xfrm_algo_desc *algo;
460
461 if (!rta)
462 return 0;
463
464 ualg = nla_data(rta);
465
466 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
467 if (!algo) {
468 NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
469 return -ENOSYS;
470 }
471 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
472 NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
473 return -EINVAL;
474 }
475 *props = algo->desc.sadb_alg_id;
476
477 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
478 if (!p)
479 return -ENOMEM;
480
481 strcpy(p->alg_name, algo->name);
482 if (!p->alg_trunc_len)
483 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
484
485 *algpp = p;
486 return 0;
487 }
488
attach_aead(struct xfrm_state * x,struct nlattr * rta,struct netlink_ext_ack * extack)489 static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
490 struct netlink_ext_ack *extack)
491 {
492 struct xfrm_algo_aead *p, *ualg;
493 struct xfrm_algo_desc *algo;
494
495 if (!rta)
496 return 0;
497
498 ualg = nla_data(rta);
499
500 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
501 if (!algo) {
502 NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
503 return -ENOSYS;
504 }
505 x->props.ealgo = algo->desc.sadb_alg_id;
506
507 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
508 if (!p)
509 return -ENOMEM;
510
511 strcpy(p->alg_name, algo->name);
512 x->aead = p;
513 x->geniv = algo->uinfo.aead.geniv;
514 return 0;
515 }
516
xfrm_replay_verify_len(struct xfrm_replay_state_esn * replay_esn,struct nlattr * rp,struct netlink_ext_ack * extack)517 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
518 struct nlattr *rp,
519 struct netlink_ext_ack *extack)
520 {
521 struct xfrm_replay_state_esn *up;
522 unsigned int ulen;
523
524 if (!replay_esn || !rp)
525 return 0;
526
527 up = nla_data(rp);
528 ulen = xfrm_replay_state_esn_len(up);
529
530 /* Check the overall length and the internal bitmap length to avoid
531 * potential overflow. */
532 if (nla_len(rp) < (int)ulen) {
533 NL_SET_ERR_MSG(extack, "ESN attribute is too short");
534 return -EINVAL;
535 }
536
537 if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
538 NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
539 return -EINVAL;
540 }
541
542 if (replay_esn->bmp_len != up->bmp_len) {
543 NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
544 return -EINVAL;
545 }
546
547 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
548 NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
549 return -EINVAL;
550 }
551
552 return 0;
553 }
554
xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn ** replay_esn,struct xfrm_replay_state_esn ** preplay_esn,struct nlattr * rta)555 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
556 struct xfrm_replay_state_esn **preplay_esn,
557 struct nlattr *rta)
558 {
559 struct xfrm_replay_state_esn *p, *pp, *up;
560 unsigned int klen, ulen;
561
562 if (!rta)
563 return 0;
564
565 up = nla_data(rta);
566 klen = xfrm_replay_state_esn_len(up);
567 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
568
569 p = kzalloc(klen, GFP_KERNEL);
570 if (!p)
571 return -ENOMEM;
572
573 pp = kzalloc(klen, GFP_KERNEL);
574 if (!pp) {
575 kfree(p);
576 return -ENOMEM;
577 }
578
579 memcpy(p, up, ulen);
580 memcpy(pp, up, ulen);
581
582 *replay_esn = p;
583 *preplay_esn = pp;
584
585 return 0;
586 }
587
xfrm_user_sec_ctx_size(struct xfrm_sec_ctx * xfrm_ctx)588 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
589 {
590 unsigned int len = 0;
591
592 if (xfrm_ctx) {
593 len += sizeof(struct xfrm_user_sec_ctx);
594 len += xfrm_ctx->ctx_len;
595 }
596 return len;
597 }
598
copy_from_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)599 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
600 {
601 memcpy(&x->id, &p->id, sizeof(x->id));
602 memcpy(&x->sel, &p->sel, sizeof(x->sel));
603 memcpy(&x->lft, &p->lft, sizeof(x->lft));
604 x->props.mode = p->mode;
605 x->props.replay_window = min_t(unsigned int, p->replay_window,
606 sizeof(x->replay.bitmap) * 8);
607 x->props.reqid = p->reqid;
608 x->props.family = p->family;
609 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
610 x->props.flags = p->flags;
611
612 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
613 x->sel.family = p->family;
614 }
615
616 /*
617 * someday when pfkey also has support, we could have the code
618 * somehow made shareable and move it to xfrm_state.c - JHS
619 *
620 */
xfrm_update_ae_params(struct xfrm_state * x,struct nlattr ** attrs,int update_esn)621 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
622 int update_esn)
623 {
624 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
625 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
626 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
627 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
628 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
629 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
630
631 if (re && x->replay_esn && x->preplay_esn) {
632 struct xfrm_replay_state_esn *replay_esn;
633 replay_esn = nla_data(re);
634 memcpy(x->replay_esn, replay_esn,
635 xfrm_replay_state_esn_len(replay_esn));
636 memcpy(x->preplay_esn, replay_esn,
637 xfrm_replay_state_esn_len(replay_esn));
638 }
639
640 if (rp) {
641 struct xfrm_replay_state *replay;
642 replay = nla_data(rp);
643 memcpy(&x->replay, replay, sizeof(*replay));
644 memcpy(&x->preplay, replay, sizeof(*replay));
645 }
646
647 if (lt) {
648 struct xfrm_lifetime_cur *ltime;
649 ltime = nla_data(lt);
650 x->curlft.bytes = ltime->bytes;
651 x->curlft.packets = ltime->packets;
652 x->curlft.add_time = ltime->add_time;
653 x->curlft.use_time = ltime->use_time;
654 }
655
656 if (et)
657 x->replay_maxage = nla_get_u32(et);
658
659 if (rt)
660 x->replay_maxdiff = nla_get_u32(rt);
661
662 if (mt)
663 x->mapping_maxage = nla_get_u32(mt);
664 }
665
xfrm_smark_init(struct nlattr ** attrs,struct xfrm_mark * m)666 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
667 {
668 if (attrs[XFRMA_SET_MARK]) {
669 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
670 if (attrs[XFRMA_SET_MARK_MASK])
671 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
672 else
673 m->m = 0xffffffff;
674 } else {
675 m->v = m->m = 0;
676 }
677 }
678
xfrm_state_construct(struct net * net,struct xfrm_usersa_info * p,struct nlattr ** attrs,int * errp,struct netlink_ext_ack * extack)679 static struct xfrm_state *xfrm_state_construct(struct net *net,
680 struct xfrm_usersa_info *p,
681 struct nlattr **attrs,
682 int *errp,
683 struct netlink_ext_ack *extack)
684 {
685 struct xfrm_state *x = xfrm_state_alloc(net);
686 int err = -ENOMEM;
687
688 if (!x)
689 goto error_no_put;
690
691 copy_from_user_state(x, p);
692
693 if (attrs[XFRMA_ENCAP]) {
694 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
695 sizeof(*x->encap), GFP_KERNEL);
696 if (x->encap == NULL)
697 goto error;
698 }
699
700 if (attrs[XFRMA_COADDR]) {
701 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
702 sizeof(*x->coaddr), GFP_KERNEL);
703 if (x->coaddr == NULL)
704 goto error;
705 }
706
707 if (attrs[XFRMA_SA_EXTRA_FLAGS])
708 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
709
710 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))
711 goto error;
712 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
713 attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
714 goto error;
715 if (!x->props.aalgo) {
716 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
717 attrs[XFRMA_ALG_AUTH], extack)))
718 goto error;
719 }
720 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
721 goto error;
722 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
723 xfrm_calg_get_byname,
724 attrs[XFRMA_ALG_COMP], extack)))
725 goto error;
726
727 if (attrs[XFRMA_TFCPAD])
728 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
729
730 xfrm_mark_get(attrs, &x->mark);
731
732 xfrm_smark_init(attrs, &x->props.smark);
733
734 if (attrs[XFRMA_IF_ID])
735 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
736
737 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack);
738 if (err)
739 goto error;
740
741 if (attrs[XFRMA_SEC_CTX]) {
742 err = security_xfrm_state_alloc(x,
743 nla_data(attrs[XFRMA_SEC_CTX]));
744 if (err)
745 goto error;
746 }
747
748 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
749 attrs[XFRMA_REPLAY_ESN_VAL])))
750 goto error;
751
752 x->km.seq = p->seq;
753 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
754 /* sysctl_xfrm_aevent_etime is in 100ms units */
755 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
756
757 if ((err = xfrm_init_replay(x, extack)))
758 goto error;
759
760 /* override default values from above */
761 xfrm_update_ae_params(x, attrs, 0);
762
763 /* configure the hardware if offload is requested */
764 if (attrs[XFRMA_OFFLOAD_DEV]) {
765 err = xfrm_dev_state_add(net, x,
766 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
767 extack);
768 if (err)
769 goto error;
770 }
771
772 return x;
773
774 error:
775 x->km.state = XFRM_STATE_DEAD;
776 xfrm_state_put(x);
777 error_no_put:
778 *errp = err;
779 return NULL;
780 }
781
xfrm_add_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)782 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
783 struct nlattr **attrs, struct netlink_ext_ack *extack)
784 {
785 struct net *net = sock_net(skb->sk);
786 struct xfrm_usersa_info *p = nlmsg_data(nlh);
787 struct xfrm_state *x;
788 int err;
789 struct km_event c;
790
791 err = verify_newsa_info(p, attrs, extack);
792 if (err)
793 return err;
794
795 x = xfrm_state_construct(net, p, attrs, &err, extack);
796 if (!x)
797 return err;
798
799 xfrm_state_hold(x);
800 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
801 err = xfrm_state_add(x);
802 else
803 err = xfrm_state_update(x);
804
805 xfrm_audit_state_add(x, err ? 0 : 1, true);
806
807 if (err < 0) {
808 x->km.state = XFRM_STATE_DEAD;
809 xfrm_dev_state_delete(x);
810 __xfrm_state_put(x);
811 goto out;
812 }
813
814 if (x->km.state == XFRM_STATE_VOID)
815 x->km.state = XFRM_STATE_VALID;
816
817 c.seq = nlh->nlmsg_seq;
818 c.portid = nlh->nlmsg_pid;
819 c.event = nlh->nlmsg_type;
820
821 km_state_notify(x, &c);
822 out:
823 xfrm_state_put(x);
824 return err;
825 }
826
xfrm_user_state_lookup(struct net * net,struct xfrm_usersa_id * p,struct nlattr ** attrs,int * errp)827 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
828 struct xfrm_usersa_id *p,
829 struct nlattr **attrs,
830 int *errp)
831 {
832 struct xfrm_state *x = NULL;
833 struct xfrm_mark m;
834 int err;
835 u32 mark = xfrm_mark_get(attrs, &m);
836
837 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
838 err = -ESRCH;
839 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
840 } else {
841 xfrm_address_t *saddr = NULL;
842
843 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
844 if (!saddr) {
845 err = -EINVAL;
846 goto out;
847 }
848
849 err = -ESRCH;
850 x = xfrm_state_lookup_byaddr(net, mark,
851 &p->daddr, saddr,
852 p->proto, p->family);
853 }
854
855 out:
856 if (!x && errp)
857 *errp = err;
858 return x;
859 }
860
xfrm_del_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)861 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
862 struct nlattr **attrs, struct netlink_ext_ack *extack)
863 {
864 struct net *net = sock_net(skb->sk);
865 struct xfrm_state *x;
866 int err = -ESRCH;
867 struct km_event c;
868 struct xfrm_usersa_id *p = nlmsg_data(nlh);
869
870 x = xfrm_user_state_lookup(net, p, attrs, &err);
871 if (x == NULL)
872 return err;
873
874 if ((err = security_xfrm_state_delete(x)) != 0)
875 goto out;
876
877 if (xfrm_state_kern(x)) {
878 NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
879 err = -EPERM;
880 goto out;
881 }
882
883 err = xfrm_state_delete(x);
884 if (err < 0)
885 goto out;
886
887 c.seq = nlh->nlmsg_seq;
888 c.portid = nlh->nlmsg_pid;
889 c.event = nlh->nlmsg_type;
890 km_state_notify(x, &c);
891
892 out:
893 xfrm_audit_state_delete(x, err ? 0 : 1, true);
894 xfrm_state_put(x);
895 return err;
896 }
897
copy_to_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)898 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
899 {
900 memset(p, 0, sizeof(*p));
901 memcpy(&p->id, &x->id, sizeof(p->id));
902 memcpy(&p->sel, &x->sel, sizeof(p->sel));
903 memcpy(&p->lft, &x->lft, sizeof(p->lft));
904 if (x->xso.dev)
905 xfrm_dev_state_update_curlft(x);
906 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
907 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
908 put_unaligned(x->stats.replay, &p->stats.replay);
909 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
910 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
911 p->mode = x->props.mode;
912 p->replay_window = x->props.replay_window;
913 p->reqid = x->props.reqid;
914 p->family = x->props.family;
915 p->flags = x->props.flags;
916 p->seq = x->km.seq;
917 }
918
919 struct xfrm_dump_info {
920 struct sk_buff *in_skb;
921 struct sk_buff *out_skb;
922 u32 nlmsg_seq;
923 u16 nlmsg_flags;
924 };
925
copy_sec_ctx(struct xfrm_sec_ctx * s,struct sk_buff * skb)926 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
927 {
928 struct xfrm_user_sec_ctx *uctx;
929 struct nlattr *attr;
930 int ctx_size = sizeof(*uctx) + s->ctx_len;
931
932 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
933 if (attr == NULL)
934 return -EMSGSIZE;
935
936 uctx = nla_data(attr);
937 uctx->exttype = XFRMA_SEC_CTX;
938 uctx->len = ctx_size;
939 uctx->ctx_doi = s->ctx_doi;
940 uctx->ctx_alg = s->ctx_alg;
941 uctx->ctx_len = s->ctx_len;
942 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
943
944 return 0;
945 }
946
copy_user_offload(struct xfrm_dev_offload * xso,struct sk_buff * skb)947 static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
948 {
949 struct xfrm_user_offload *xuo;
950 struct nlattr *attr;
951
952 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
953 if (attr == NULL)
954 return -EMSGSIZE;
955
956 xuo = nla_data(attr);
957 memset(xuo, 0, sizeof(*xuo));
958 xuo->ifindex = xso->dev->ifindex;
959 if (xso->dir == XFRM_DEV_OFFLOAD_IN)
960 xuo->flags = XFRM_OFFLOAD_INBOUND;
961 if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
962 xuo->flags |= XFRM_OFFLOAD_PACKET;
963
964 return 0;
965 }
966
xfrm_redact(void)967 static bool xfrm_redact(void)
968 {
969 return IS_ENABLED(CONFIG_SECURITY) &&
970 security_locked_down(LOCKDOWN_XFRM_SECRET);
971 }
972
copy_to_user_auth(struct xfrm_algo_auth * auth,struct sk_buff * skb)973 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
974 {
975 struct xfrm_algo *algo;
976 struct xfrm_algo_auth *ap;
977 struct nlattr *nla;
978 bool redact_secret = xfrm_redact();
979
980 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
981 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
982 if (!nla)
983 return -EMSGSIZE;
984 algo = nla_data(nla);
985 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
986
987 if (redact_secret && auth->alg_key_len)
988 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
989 else
990 memcpy(algo->alg_key, auth->alg_key,
991 (auth->alg_key_len + 7) / 8);
992 algo->alg_key_len = auth->alg_key_len;
993
994 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
995 if (!nla)
996 return -EMSGSIZE;
997 ap = nla_data(nla);
998 memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
999 if (redact_secret && auth->alg_key_len)
1000 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
1001 else
1002 memcpy(ap->alg_key, auth->alg_key,
1003 (auth->alg_key_len + 7) / 8);
1004 return 0;
1005 }
1006
copy_to_user_aead(struct xfrm_algo_aead * aead,struct sk_buff * skb)1007 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
1008 {
1009 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
1010 struct xfrm_algo_aead *ap;
1011 bool redact_secret = xfrm_redact();
1012
1013 if (!nla)
1014 return -EMSGSIZE;
1015
1016 ap = nla_data(nla);
1017 strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name));
1018 ap->alg_key_len = aead->alg_key_len;
1019 ap->alg_icv_len = aead->alg_icv_len;
1020
1021 if (redact_secret && aead->alg_key_len)
1022 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
1023 else
1024 memcpy(ap->alg_key, aead->alg_key,
1025 (aead->alg_key_len + 7) / 8);
1026 return 0;
1027 }
1028
copy_to_user_ealg(struct xfrm_algo * ealg,struct sk_buff * skb)1029 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
1030 {
1031 struct xfrm_algo *ap;
1032 bool redact_secret = xfrm_redact();
1033 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
1034 xfrm_alg_len(ealg));
1035 if (!nla)
1036 return -EMSGSIZE;
1037
1038 ap = nla_data(nla);
1039 strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name));
1040 ap->alg_key_len = ealg->alg_key_len;
1041
1042 if (redact_secret && ealg->alg_key_len)
1043 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
1044 else
1045 memcpy(ap->alg_key, ealg->alg_key,
1046 (ealg->alg_key_len + 7) / 8);
1047
1048 return 0;
1049 }
1050
copy_to_user_calg(struct xfrm_algo * calg,struct sk_buff * skb)1051 static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
1052 {
1053 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
1054 struct xfrm_algo *ap;
1055
1056 if (!nla)
1057 return -EMSGSIZE;
1058
1059 ap = nla_data(nla);
1060 strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name));
1061 ap->alg_key_len = 0;
1062
1063 return 0;
1064 }
1065
copy_to_user_encap(struct xfrm_encap_tmpl * ep,struct sk_buff * skb)1066 static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
1067 {
1068 struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
1069 struct xfrm_encap_tmpl *uep;
1070
1071 if (!nla)
1072 return -EMSGSIZE;
1073
1074 uep = nla_data(nla);
1075 memset(uep, 0, sizeof(*uep));
1076
1077 uep->encap_type = ep->encap_type;
1078 uep->encap_sport = ep->encap_sport;
1079 uep->encap_dport = ep->encap_dport;
1080 uep->encap_oa = ep->encap_oa;
1081
1082 return 0;
1083 }
1084
xfrm_smark_put(struct sk_buff * skb,struct xfrm_mark * m)1085 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
1086 {
1087 int ret = 0;
1088
1089 if (m->v | m->m) {
1090 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
1091 if (!ret)
1092 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
1093 }
1094 return ret;
1095 }
1096
1097 /* Don't change this without updating xfrm_sa_len! */
copy_to_user_state_extra(struct xfrm_state * x,struct xfrm_usersa_info * p,struct sk_buff * skb)1098 static int copy_to_user_state_extra(struct xfrm_state *x,
1099 struct xfrm_usersa_info *p,
1100 struct sk_buff *skb)
1101 {
1102 int ret = 0;
1103
1104 copy_to_user_state(x, p);
1105
1106 if (x->props.extra_flags) {
1107 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
1108 x->props.extra_flags);
1109 if (ret)
1110 goto out;
1111 }
1112
1113 if (x->coaddr) {
1114 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
1115 if (ret)
1116 goto out;
1117 }
1118 if (x->lastused) {
1119 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
1120 XFRMA_PAD);
1121 if (ret)
1122 goto out;
1123 }
1124 if (x->aead) {
1125 ret = copy_to_user_aead(x->aead, skb);
1126 if (ret)
1127 goto out;
1128 }
1129 if (x->aalg) {
1130 ret = copy_to_user_auth(x->aalg, skb);
1131 if (ret)
1132 goto out;
1133 }
1134 if (x->ealg) {
1135 ret = copy_to_user_ealg(x->ealg, skb);
1136 if (ret)
1137 goto out;
1138 }
1139 if (x->calg) {
1140 ret = copy_to_user_calg(x->calg, skb);
1141 if (ret)
1142 goto out;
1143 }
1144 if (x->encap) {
1145 ret = copy_to_user_encap(x->encap, skb);
1146 if (ret)
1147 goto out;
1148 }
1149 if (x->tfcpad) {
1150 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1151 if (ret)
1152 goto out;
1153 }
1154 ret = xfrm_mark_put(skb, &x->mark);
1155 if (ret)
1156 goto out;
1157
1158 ret = xfrm_smark_put(skb, &x->props.smark);
1159 if (ret)
1160 goto out;
1161
1162 if (x->replay_esn)
1163 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1164 xfrm_replay_state_esn_len(x->replay_esn),
1165 x->replay_esn);
1166 else
1167 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1168 &x->replay);
1169 if (ret)
1170 goto out;
1171 if(x->xso.dev)
1172 ret = copy_user_offload(&x->xso, skb);
1173 if (ret)
1174 goto out;
1175 if (x->if_id) {
1176 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1177 if (ret)
1178 goto out;
1179 }
1180 if (x->security) {
1181 ret = copy_sec_ctx(x->security, skb);
1182 if (ret)
1183 goto out;
1184 }
1185 if (x->mapping_maxage)
1186 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1187 out:
1188 return ret;
1189 }
1190
dump_one_state(struct xfrm_state * x,int count,void * ptr)1191 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1192 {
1193 struct xfrm_dump_info *sp = ptr;
1194 struct sk_buff *in_skb = sp->in_skb;
1195 struct sk_buff *skb = sp->out_skb;
1196 struct xfrm_translator *xtr;
1197 struct xfrm_usersa_info *p;
1198 struct nlmsghdr *nlh;
1199 int err;
1200
1201 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1202 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1203 if (nlh == NULL)
1204 return -EMSGSIZE;
1205
1206 p = nlmsg_data(nlh);
1207
1208 err = copy_to_user_state_extra(x, p, skb);
1209 if (err) {
1210 nlmsg_cancel(skb, nlh);
1211 return err;
1212 }
1213 nlmsg_end(skb, nlh);
1214
1215 xtr = xfrm_get_translator();
1216 if (xtr) {
1217 err = xtr->alloc_compat(skb, nlh);
1218
1219 xfrm_put_translator(xtr);
1220 if (err) {
1221 nlmsg_cancel(skb, nlh);
1222 return err;
1223 }
1224 }
1225
1226 return 0;
1227 }
1228
xfrm_dump_sa_done(struct netlink_callback * cb)1229 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1230 {
1231 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1232 struct sock *sk = cb->skb->sk;
1233 struct net *net = sock_net(sk);
1234
1235 if (cb->args[0])
1236 xfrm_state_walk_done(walk, net);
1237 return 0;
1238 }
1239
xfrm_dump_sa(struct sk_buff * skb,struct netlink_callback * cb)1240 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1241 {
1242 struct net *net = sock_net(skb->sk);
1243 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1244 struct xfrm_dump_info info;
1245
1246 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1247 sizeof(cb->args) - sizeof(cb->args[0]));
1248
1249 info.in_skb = cb->skb;
1250 info.out_skb = skb;
1251 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1252 info.nlmsg_flags = NLM_F_MULTI;
1253
1254 if (!cb->args[0]) {
1255 struct nlattr *attrs[XFRMA_MAX+1];
1256 struct xfrm_address_filter *filter = NULL;
1257 u8 proto = 0;
1258 int err;
1259
1260 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1261 xfrma_policy, cb->extack);
1262 if (err < 0)
1263 return err;
1264
1265 if (attrs[XFRMA_ADDRESS_FILTER]) {
1266 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1267 sizeof(*filter), GFP_KERNEL);
1268 if (filter == NULL)
1269 return -ENOMEM;
1270
1271 /* see addr_match(), (prefix length >> 5) << 2
1272 * will be used to compare xfrm_address_t
1273 */
1274 if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1275 filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1276 kfree(filter);
1277 return -EINVAL;
1278 }
1279 }
1280
1281 if (attrs[XFRMA_PROTO])
1282 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1283
1284 xfrm_state_walk_init(walk, proto, filter);
1285 cb->args[0] = 1;
1286 }
1287
1288 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1289
1290 return skb->len;
1291 }
1292
xfrm_state_netlink(struct sk_buff * in_skb,struct xfrm_state * x,u32 seq)1293 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1294 struct xfrm_state *x, u32 seq)
1295 {
1296 struct xfrm_dump_info info;
1297 struct sk_buff *skb;
1298 int err;
1299
1300 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1301 if (!skb)
1302 return ERR_PTR(-ENOMEM);
1303
1304 info.in_skb = in_skb;
1305 info.out_skb = skb;
1306 info.nlmsg_seq = seq;
1307 info.nlmsg_flags = 0;
1308
1309 err = dump_one_state(x, 0, &info);
1310 if (err) {
1311 kfree_skb(skb);
1312 return ERR_PTR(err);
1313 }
1314
1315 return skb;
1316 }
1317
1318 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1319 * Must be called with RCU read lock.
1320 */
xfrm_nlmsg_multicast(struct net * net,struct sk_buff * skb,u32 pid,unsigned int group)1321 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1322 u32 pid, unsigned int group)
1323 {
1324 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1325 struct xfrm_translator *xtr;
1326
1327 if (!nlsk) {
1328 kfree_skb(skb);
1329 return -EPIPE;
1330 }
1331
1332 xtr = xfrm_get_translator();
1333 if (xtr) {
1334 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1335
1336 xfrm_put_translator(xtr);
1337 if (err) {
1338 kfree_skb(skb);
1339 return err;
1340 }
1341 }
1342
1343 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1344 }
1345
xfrm_spdinfo_msgsize(void)1346 static inline unsigned int xfrm_spdinfo_msgsize(void)
1347 {
1348 return NLMSG_ALIGN(4)
1349 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1350 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1351 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1352 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1353 }
1354
build_spdinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1355 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1356 u32 portid, u32 seq, u32 flags)
1357 {
1358 struct xfrmk_spdinfo si;
1359 struct xfrmu_spdinfo spc;
1360 struct xfrmu_spdhinfo sph;
1361 struct xfrmu_spdhthresh spt4, spt6;
1362 struct nlmsghdr *nlh;
1363 int err;
1364 u32 *f;
1365 unsigned lseq;
1366
1367 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1368 if (nlh == NULL) /* shouldn't really happen ... */
1369 return -EMSGSIZE;
1370
1371 f = nlmsg_data(nlh);
1372 *f = flags;
1373 xfrm_spd_getinfo(net, &si);
1374 spc.incnt = si.incnt;
1375 spc.outcnt = si.outcnt;
1376 spc.fwdcnt = si.fwdcnt;
1377 spc.inscnt = si.inscnt;
1378 spc.outscnt = si.outscnt;
1379 spc.fwdscnt = si.fwdscnt;
1380 sph.spdhcnt = si.spdhcnt;
1381 sph.spdhmcnt = si.spdhmcnt;
1382
1383 do {
1384 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1385
1386 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1387 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1388 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1389 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1390 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1391
1392 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1393 if (!err)
1394 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1395 if (!err)
1396 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1397 if (!err)
1398 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1399 if (err) {
1400 nlmsg_cancel(skb, nlh);
1401 return err;
1402 }
1403
1404 nlmsg_end(skb, nlh);
1405 return 0;
1406 }
1407
xfrm_set_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1408 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1409 struct nlattr **attrs,
1410 struct netlink_ext_ack *extack)
1411 {
1412 struct net *net = sock_net(skb->sk);
1413 struct xfrmu_spdhthresh *thresh4 = NULL;
1414 struct xfrmu_spdhthresh *thresh6 = NULL;
1415
1416 /* selector prefixlen thresholds to hash policies */
1417 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1418 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1419
1420 if (nla_len(rta) < sizeof(*thresh4)) {
1421 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
1422 return -EINVAL;
1423 }
1424 thresh4 = nla_data(rta);
1425 if (thresh4->lbits > 32 || thresh4->rbits > 32) {
1426 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
1427 return -EINVAL;
1428 }
1429 }
1430 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1431 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1432
1433 if (nla_len(rta) < sizeof(*thresh6)) {
1434 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
1435 return -EINVAL;
1436 }
1437 thresh6 = nla_data(rta);
1438 if (thresh6->lbits > 128 || thresh6->rbits > 128) {
1439 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
1440 return -EINVAL;
1441 }
1442 }
1443
1444 if (thresh4 || thresh6) {
1445 write_seqlock(&net->xfrm.policy_hthresh.lock);
1446 if (thresh4) {
1447 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1448 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1449 }
1450 if (thresh6) {
1451 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1452 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1453 }
1454 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1455
1456 xfrm_policy_hash_rebuild(net);
1457 }
1458
1459 return 0;
1460 }
1461
xfrm_get_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1462 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1463 struct nlattr **attrs,
1464 struct netlink_ext_ack *extack)
1465 {
1466 struct net *net = sock_net(skb->sk);
1467 struct sk_buff *r_skb;
1468 u32 *flags = nlmsg_data(nlh);
1469 u32 sportid = NETLINK_CB(skb).portid;
1470 u32 seq = nlh->nlmsg_seq;
1471 int err;
1472
1473 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1474 if (r_skb == NULL)
1475 return -ENOMEM;
1476
1477 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1478 BUG_ON(err < 0);
1479
1480 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1481 }
1482
xfrm_sadinfo_msgsize(void)1483 static inline unsigned int xfrm_sadinfo_msgsize(void)
1484 {
1485 return NLMSG_ALIGN(4)
1486 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1487 + nla_total_size(4); /* XFRMA_SAD_CNT */
1488 }
1489
build_sadinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1490 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1491 u32 portid, u32 seq, u32 flags)
1492 {
1493 struct xfrmk_sadinfo si;
1494 struct xfrmu_sadhinfo sh;
1495 struct nlmsghdr *nlh;
1496 int err;
1497 u32 *f;
1498
1499 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1500 if (nlh == NULL) /* shouldn't really happen ... */
1501 return -EMSGSIZE;
1502
1503 f = nlmsg_data(nlh);
1504 *f = flags;
1505 xfrm_sad_getinfo(net, &si);
1506
1507 sh.sadhmcnt = si.sadhmcnt;
1508 sh.sadhcnt = si.sadhcnt;
1509
1510 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1511 if (!err)
1512 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1513 if (err) {
1514 nlmsg_cancel(skb, nlh);
1515 return err;
1516 }
1517
1518 nlmsg_end(skb, nlh);
1519 return 0;
1520 }
1521
xfrm_get_sadinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1522 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1523 struct nlattr **attrs,
1524 struct netlink_ext_ack *extack)
1525 {
1526 struct net *net = sock_net(skb->sk);
1527 struct sk_buff *r_skb;
1528 u32 *flags = nlmsg_data(nlh);
1529 u32 sportid = NETLINK_CB(skb).portid;
1530 u32 seq = nlh->nlmsg_seq;
1531 int err;
1532
1533 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1534 if (r_skb == NULL)
1535 return -ENOMEM;
1536
1537 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1538 BUG_ON(err < 0);
1539
1540 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1541 }
1542
xfrm_get_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1543 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1544 struct nlattr **attrs, struct netlink_ext_ack *extack)
1545 {
1546 struct net *net = sock_net(skb->sk);
1547 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1548 struct xfrm_state *x;
1549 struct sk_buff *resp_skb;
1550 int err = -ESRCH;
1551
1552 x = xfrm_user_state_lookup(net, p, attrs, &err);
1553 if (x == NULL)
1554 goto out_noput;
1555
1556 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1557 if (IS_ERR(resp_skb)) {
1558 err = PTR_ERR(resp_skb);
1559 } else {
1560 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1561 }
1562 xfrm_state_put(x);
1563 out_noput:
1564 return err;
1565 }
1566
xfrm_alloc_userspi(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1567 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1568 struct nlattr **attrs,
1569 struct netlink_ext_ack *extack)
1570 {
1571 struct net *net = sock_net(skb->sk);
1572 struct xfrm_state *x;
1573 struct xfrm_userspi_info *p;
1574 struct xfrm_translator *xtr;
1575 struct sk_buff *resp_skb;
1576 xfrm_address_t *daddr;
1577 int family;
1578 int err;
1579 u32 mark;
1580 struct xfrm_mark m;
1581 u32 if_id = 0;
1582
1583 p = nlmsg_data(nlh);
1584 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
1585 if (err)
1586 goto out_noput;
1587
1588 family = p->info.family;
1589 daddr = &p->info.id.daddr;
1590
1591 x = NULL;
1592
1593 mark = xfrm_mark_get(attrs, &m);
1594
1595 if (attrs[XFRMA_IF_ID])
1596 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1597
1598 if (p->info.seq) {
1599 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1600 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1601 xfrm_state_put(x);
1602 x = NULL;
1603 }
1604 }
1605
1606 if (!x)
1607 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1608 if_id, p->info.id.proto, daddr,
1609 &p->info.saddr, 1,
1610 family);
1611 err = -ENOENT;
1612 if (!x) {
1613 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
1614 goto out_noput;
1615 }
1616
1617 err = xfrm_alloc_spi(x, p->min, p->max, extack);
1618 if (err)
1619 goto out;
1620
1621 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1622 if (IS_ERR(resp_skb)) {
1623 err = PTR_ERR(resp_skb);
1624 goto out;
1625 }
1626
1627 xtr = xfrm_get_translator();
1628 if (xtr) {
1629 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1630
1631 xfrm_put_translator(xtr);
1632 if (err) {
1633 kfree_skb(resp_skb);
1634 goto out;
1635 }
1636 }
1637
1638 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1639
1640 out:
1641 xfrm_state_put(x);
1642 out_noput:
1643 return err;
1644 }
1645
verify_policy_dir(u8 dir,struct netlink_ext_ack * extack)1646 static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
1647 {
1648 switch (dir) {
1649 case XFRM_POLICY_IN:
1650 case XFRM_POLICY_OUT:
1651 case XFRM_POLICY_FWD:
1652 break;
1653
1654 default:
1655 NL_SET_ERR_MSG(extack, "Invalid policy direction");
1656 return -EINVAL;
1657 }
1658
1659 return 0;
1660 }
1661
verify_policy_type(u8 type,struct netlink_ext_ack * extack)1662 static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
1663 {
1664 switch (type) {
1665 case XFRM_POLICY_TYPE_MAIN:
1666 #ifdef CONFIG_XFRM_SUB_POLICY
1667 case XFRM_POLICY_TYPE_SUB:
1668 #endif
1669 break;
1670
1671 default:
1672 NL_SET_ERR_MSG(extack, "Invalid policy type");
1673 return -EINVAL;
1674 }
1675
1676 return 0;
1677 }
1678
verify_newpolicy_info(struct xfrm_userpolicy_info * p,struct netlink_ext_ack * extack)1679 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
1680 struct netlink_ext_ack *extack)
1681 {
1682 int ret;
1683
1684 switch (p->share) {
1685 case XFRM_SHARE_ANY:
1686 case XFRM_SHARE_SESSION:
1687 case XFRM_SHARE_USER:
1688 case XFRM_SHARE_UNIQUE:
1689 break;
1690
1691 default:
1692 NL_SET_ERR_MSG(extack, "Invalid policy share");
1693 return -EINVAL;
1694 }
1695
1696 switch (p->action) {
1697 case XFRM_POLICY_ALLOW:
1698 case XFRM_POLICY_BLOCK:
1699 break;
1700
1701 default:
1702 NL_SET_ERR_MSG(extack, "Invalid policy action");
1703 return -EINVAL;
1704 }
1705
1706 switch (p->sel.family) {
1707 case AF_INET:
1708 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
1709 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
1710 return -EINVAL;
1711 }
1712
1713 break;
1714
1715 case AF_INET6:
1716 #if IS_ENABLED(CONFIG_IPV6)
1717 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
1718 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
1719 return -EINVAL;
1720 }
1721
1722 break;
1723 #else
1724 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
1725 return -EAFNOSUPPORT;
1726 #endif
1727
1728 default:
1729 NL_SET_ERR_MSG(extack, "Invalid selector family");
1730 return -EINVAL;
1731 }
1732
1733 ret = verify_policy_dir(p->dir, extack);
1734 if (ret)
1735 return ret;
1736 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
1737 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
1738 return -EINVAL;
1739 }
1740
1741 return 0;
1742 }
1743
copy_from_user_sec_ctx(struct xfrm_policy * pol,struct nlattr ** attrs)1744 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1745 {
1746 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1747 struct xfrm_user_sec_ctx *uctx;
1748
1749 if (!rt)
1750 return 0;
1751
1752 uctx = nla_data(rt);
1753 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1754 }
1755
copy_templates(struct xfrm_policy * xp,struct xfrm_user_tmpl * ut,int nr)1756 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1757 int nr)
1758 {
1759 int i;
1760
1761 xp->xfrm_nr = nr;
1762 for (i = 0; i < nr; i++, ut++) {
1763 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1764
1765 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1766 memcpy(&t->saddr, &ut->saddr,
1767 sizeof(xfrm_address_t));
1768 t->reqid = ut->reqid;
1769 t->mode = ut->mode;
1770 t->share = ut->share;
1771 t->optional = ut->optional;
1772 t->aalgos = ut->aalgos;
1773 t->ealgos = ut->ealgos;
1774 t->calgos = ut->calgos;
1775 /* If all masks are ~0, then we allow all algorithms. */
1776 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1777 t->encap_family = ut->family;
1778 }
1779 }
1780
validate_tmpl(int nr,struct xfrm_user_tmpl * ut,u16 family,int dir,struct netlink_ext_ack * extack)1781 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,
1782 int dir, struct netlink_ext_ack *extack)
1783 {
1784 u16 prev_family;
1785 int i;
1786
1787 if (nr > XFRM_MAX_DEPTH) {
1788 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
1789 return -EINVAL;
1790 }
1791
1792 prev_family = family;
1793
1794 for (i = 0; i < nr; i++) {
1795 /* We never validated the ut->family value, so many
1796 * applications simply leave it at zero. The check was
1797 * never made and ut->family was ignored because all
1798 * templates could be assumed to have the same family as
1799 * the policy itself. Now that we will have ipv4-in-ipv6
1800 * and ipv6-in-ipv4 tunnels, this is no longer true.
1801 */
1802 if (!ut[i].family)
1803 ut[i].family = family;
1804
1805 switch (ut[i].mode) {
1806 case XFRM_MODE_TUNNEL:
1807 case XFRM_MODE_BEET:
1808 if (ut[i].optional && dir == XFRM_POLICY_OUT) {
1809 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
1810 return -EINVAL;
1811 }
1812 break;
1813 default:
1814 if (ut[i].family != prev_family) {
1815 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
1816 return -EINVAL;
1817 }
1818 break;
1819 }
1820 if (ut[i].mode >= XFRM_MODE_MAX) {
1821 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
1822 return -EINVAL;
1823 }
1824
1825 prev_family = ut[i].family;
1826
1827 switch (ut[i].family) {
1828 case AF_INET:
1829 break;
1830 #if IS_ENABLED(CONFIG_IPV6)
1831 case AF_INET6:
1832 break;
1833 #endif
1834 default:
1835 NL_SET_ERR_MSG(extack, "Invalid family in template");
1836 return -EINVAL;
1837 }
1838
1839 if (!xfrm_id_proto_valid(ut[i].id.proto)) {
1840 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
1841 return -EINVAL;
1842 }
1843 }
1844
1845 return 0;
1846 }
1847
copy_from_user_tmpl(struct xfrm_policy * pol,struct nlattr ** attrs,int dir,struct netlink_ext_ack * extack)1848 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
1849 int dir, struct netlink_ext_ack *extack)
1850 {
1851 struct nlattr *rt = attrs[XFRMA_TMPL];
1852
1853 if (!rt) {
1854 pol->xfrm_nr = 0;
1855 } else {
1856 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1857 int nr = nla_len(rt) / sizeof(*utmpl);
1858 int err;
1859
1860 err = validate_tmpl(nr, utmpl, pol->family, dir, extack);
1861 if (err)
1862 return err;
1863
1864 copy_templates(pol, utmpl, nr);
1865 }
1866 return 0;
1867 }
1868
copy_from_user_policy_type(u8 * tp,struct nlattr ** attrs,struct netlink_ext_ack * extack)1869 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
1870 struct netlink_ext_ack *extack)
1871 {
1872 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1873 struct xfrm_userpolicy_type *upt;
1874 u8 type = XFRM_POLICY_TYPE_MAIN;
1875 int err;
1876
1877 if (rt) {
1878 upt = nla_data(rt);
1879 type = upt->type;
1880 }
1881
1882 err = verify_policy_type(type, extack);
1883 if (err)
1884 return err;
1885
1886 *tp = type;
1887 return 0;
1888 }
1889
copy_from_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p)1890 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1891 {
1892 xp->priority = p->priority;
1893 xp->index = p->index;
1894 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1895 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1896 xp->action = p->action;
1897 xp->flags = p->flags;
1898 xp->family = p->sel.family;
1899 /* XXX xp->share = p->share; */
1900 }
1901
copy_to_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p,int dir)1902 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1903 {
1904 memset(p, 0, sizeof(*p));
1905 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1906 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1907 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1908 p->priority = xp->priority;
1909 p->index = xp->index;
1910 p->sel.family = xp->family;
1911 p->dir = dir;
1912 p->action = xp->action;
1913 p->flags = xp->flags;
1914 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1915 }
1916
xfrm_policy_construct(struct net * net,struct xfrm_userpolicy_info * p,struct nlattr ** attrs,int * errp,struct netlink_ext_ack * extack)1917 static struct xfrm_policy *xfrm_policy_construct(struct net *net,
1918 struct xfrm_userpolicy_info *p,
1919 struct nlattr **attrs,
1920 int *errp,
1921 struct netlink_ext_ack *extack)
1922 {
1923 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1924 int err;
1925
1926 if (!xp) {
1927 *errp = -ENOMEM;
1928 return NULL;
1929 }
1930
1931 copy_from_user_policy(xp, p);
1932
1933 err = copy_from_user_policy_type(&xp->type, attrs, extack);
1934 if (err)
1935 goto error;
1936
1937 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
1938 err = copy_from_user_sec_ctx(xp, attrs);
1939 if (err)
1940 goto error;
1941
1942 xfrm_mark_get(attrs, &xp->mark);
1943
1944 if (attrs[XFRMA_IF_ID])
1945 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1946
1947 /* configure the hardware if offload is requested */
1948 if (attrs[XFRMA_OFFLOAD_DEV]) {
1949 err = xfrm_dev_policy_add(net, xp,
1950 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
1951 p->dir, extack);
1952 if (err)
1953 goto error;
1954 }
1955
1956 return xp;
1957 error:
1958 *errp = err;
1959 xp->walk.dead = 1;
1960 xfrm_policy_destroy(xp);
1961 return NULL;
1962 }
1963
xfrm_add_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)1964 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1965 struct nlattr **attrs,
1966 struct netlink_ext_ack *extack)
1967 {
1968 struct net *net = sock_net(skb->sk);
1969 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1970 struct xfrm_policy *xp;
1971 struct km_event c;
1972 int err;
1973 int excl;
1974
1975 err = verify_newpolicy_info(p, extack);
1976 if (err)
1977 return err;
1978 err = verify_sec_ctx_len(attrs, extack);
1979 if (err)
1980 return err;
1981
1982 xp = xfrm_policy_construct(net, p, attrs, &err, extack);
1983 if (!xp)
1984 return err;
1985
1986 /* shouldn't excl be based on nlh flags??
1987 * Aha! this is anti-netlink really i.e more pfkey derived
1988 * in netlink excl is a flag and you wouldn't need
1989 * a type XFRM_MSG_UPDPOLICY - JHS */
1990 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1991 err = xfrm_policy_insert(p->dir, xp, excl);
1992 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1993
1994 if (err) {
1995 xfrm_dev_policy_delete(xp);
1996 xfrm_dev_policy_free(xp);
1997 security_xfrm_policy_free(xp->security);
1998 kfree(xp);
1999 return err;
2000 }
2001
2002 c.event = nlh->nlmsg_type;
2003 c.seq = nlh->nlmsg_seq;
2004 c.portid = nlh->nlmsg_pid;
2005 km_policy_notify(xp, p->dir, &c);
2006
2007 xfrm_pol_put(xp);
2008
2009 return 0;
2010 }
2011
copy_to_user_tmpl(struct xfrm_policy * xp,struct sk_buff * skb)2012 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
2013 {
2014 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
2015 int i;
2016
2017 if (xp->xfrm_nr == 0)
2018 return 0;
2019
2020 if (xp->xfrm_nr > XFRM_MAX_DEPTH)
2021 return -ENOBUFS;
2022
2023 for (i = 0; i < xp->xfrm_nr; i++) {
2024 struct xfrm_user_tmpl *up = &vec[i];
2025 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
2026
2027 memset(up, 0, sizeof(*up));
2028 memcpy(&up->id, &kp->id, sizeof(up->id));
2029 up->family = kp->encap_family;
2030 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
2031 up->reqid = kp->reqid;
2032 up->mode = kp->mode;
2033 up->share = kp->share;
2034 up->optional = kp->optional;
2035 up->aalgos = kp->aalgos;
2036 up->ealgos = kp->ealgos;
2037 up->calgos = kp->calgos;
2038 }
2039
2040 return nla_put(skb, XFRMA_TMPL,
2041 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
2042 }
2043
copy_to_user_state_sec_ctx(struct xfrm_state * x,struct sk_buff * skb)2044 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
2045 {
2046 if (x->security) {
2047 return copy_sec_ctx(x->security, skb);
2048 }
2049 return 0;
2050 }
2051
copy_to_user_sec_ctx(struct xfrm_policy * xp,struct sk_buff * skb)2052 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
2053 {
2054 if (xp->security)
2055 return copy_sec_ctx(xp->security, skb);
2056 return 0;
2057 }
userpolicy_type_attrsize(void)2058 static inline unsigned int userpolicy_type_attrsize(void)
2059 {
2060 #ifdef CONFIG_XFRM_SUB_POLICY
2061 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
2062 #else
2063 return 0;
2064 #endif
2065 }
2066
2067 #ifdef CONFIG_XFRM_SUB_POLICY
copy_to_user_policy_type(u8 type,struct sk_buff * skb)2068 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2069 {
2070 struct xfrm_userpolicy_type upt;
2071
2072 /* Sadly there are two holes in struct xfrm_userpolicy_type */
2073 memset(&upt, 0, sizeof(upt));
2074 upt.type = type;
2075
2076 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2077 }
2078
2079 #else
copy_to_user_policy_type(u8 type,struct sk_buff * skb)2080 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2081 {
2082 return 0;
2083 }
2084 #endif
2085
dump_one_policy(struct xfrm_policy * xp,int dir,int count,void * ptr)2086 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
2087 {
2088 struct xfrm_dump_info *sp = ptr;
2089 struct xfrm_userpolicy_info *p;
2090 struct sk_buff *in_skb = sp->in_skb;
2091 struct sk_buff *skb = sp->out_skb;
2092 struct xfrm_translator *xtr;
2093 struct nlmsghdr *nlh;
2094 int err;
2095
2096 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
2097 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
2098 if (nlh == NULL)
2099 return -EMSGSIZE;
2100
2101 p = nlmsg_data(nlh);
2102 copy_to_user_policy(xp, p, dir);
2103 err = copy_to_user_tmpl(xp, skb);
2104 if (!err)
2105 err = copy_to_user_sec_ctx(xp, skb);
2106 if (!err)
2107 err = copy_to_user_policy_type(xp->type, skb);
2108 if (!err)
2109 err = xfrm_mark_put(skb, &xp->mark);
2110 if (!err)
2111 err = xfrm_if_id_put(skb, xp->if_id);
2112 if (!err && xp->xdo.dev)
2113 err = copy_user_offload(&xp->xdo, skb);
2114 if (err) {
2115 nlmsg_cancel(skb, nlh);
2116 return err;
2117 }
2118 nlmsg_end(skb, nlh);
2119
2120 xtr = xfrm_get_translator();
2121 if (xtr) {
2122 err = xtr->alloc_compat(skb, nlh);
2123
2124 xfrm_put_translator(xtr);
2125 if (err) {
2126 nlmsg_cancel(skb, nlh);
2127 return err;
2128 }
2129 }
2130
2131 return 0;
2132 }
2133
xfrm_dump_policy_done(struct netlink_callback * cb)2134 static int xfrm_dump_policy_done(struct netlink_callback *cb)
2135 {
2136 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2137 struct net *net = sock_net(cb->skb->sk);
2138
2139 xfrm_policy_walk_done(walk, net);
2140 return 0;
2141 }
2142
xfrm_dump_policy_start(struct netlink_callback * cb)2143 static int xfrm_dump_policy_start(struct netlink_callback *cb)
2144 {
2145 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2146
2147 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
2148
2149 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
2150 return 0;
2151 }
2152
xfrm_dump_policy(struct sk_buff * skb,struct netlink_callback * cb)2153 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
2154 {
2155 struct net *net = sock_net(skb->sk);
2156 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2157 struct xfrm_dump_info info;
2158
2159 info.in_skb = cb->skb;
2160 info.out_skb = skb;
2161 info.nlmsg_seq = cb->nlh->nlmsg_seq;
2162 info.nlmsg_flags = NLM_F_MULTI;
2163
2164 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
2165
2166 return skb->len;
2167 }
2168
xfrm_policy_netlink(struct sk_buff * in_skb,struct xfrm_policy * xp,int dir,u32 seq)2169 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
2170 struct xfrm_policy *xp,
2171 int dir, u32 seq)
2172 {
2173 struct xfrm_dump_info info;
2174 struct sk_buff *skb;
2175 int err;
2176
2177 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2178 if (!skb)
2179 return ERR_PTR(-ENOMEM);
2180
2181 info.in_skb = in_skb;
2182 info.out_skb = skb;
2183 info.nlmsg_seq = seq;
2184 info.nlmsg_flags = 0;
2185
2186 err = dump_one_policy(xp, dir, 0, &info);
2187 if (err) {
2188 kfree_skb(skb);
2189 return ERR_PTR(err);
2190 }
2191
2192 return skb;
2193 }
2194
xfrm_notify_userpolicy(struct net * net)2195 static int xfrm_notify_userpolicy(struct net *net)
2196 {
2197 struct xfrm_userpolicy_default *up;
2198 int len = NLMSG_ALIGN(sizeof(*up));
2199 struct nlmsghdr *nlh;
2200 struct sk_buff *skb;
2201 int err;
2202
2203 skb = nlmsg_new(len, GFP_ATOMIC);
2204 if (skb == NULL)
2205 return -ENOMEM;
2206
2207 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
2208 if (nlh == NULL) {
2209 kfree_skb(skb);
2210 return -EMSGSIZE;
2211 }
2212
2213 up = nlmsg_data(nlh);
2214 up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2215 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2216 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2217
2218 nlmsg_end(skb, nlh);
2219
2220 rcu_read_lock();
2221 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2222 rcu_read_unlock();
2223
2224 return err;
2225 }
2226
xfrm_userpolicy_is_valid(__u8 policy)2227 static bool xfrm_userpolicy_is_valid(__u8 policy)
2228 {
2229 return policy == XFRM_USERPOLICY_BLOCK ||
2230 policy == XFRM_USERPOLICY_ACCEPT;
2231 }
2232
xfrm_set_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2233 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2234 struct nlattr **attrs, struct netlink_ext_ack *extack)
2235 {
2236 struct net *net = sock_net(skb->sk);
2237 struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2238
2239 if (xfrm_userpolicy_is_valid(up->in))
2240 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2241
2242 if (xfrm_userpolicy_is_valid(up->fwd))
2243 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2244
2245 if (xfrm_userpolicy_is_valid(up->out))
2246 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2247
2248 rt_genid_bump_all(net);
2249
2250 xfrm_notify_userpolicy(net);
2251 return 0;
2252 }
2253
xfrm_get_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2254 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2255 struct nlattr **attrs, struct netlink_ext_ack *extack)
2256 {
2257 struct sk_buff *r_skb;
2258 struct nlmsghdr *r_nlh;
2259 struct net *net = sock_net(skb->sk);
2260 struct xfrm_userpolicy_default *r_up;
2261 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2262 u32 portid = NETLINK_CB(skb).portid;
2263 u32 seq = nlh->nlmsg_seq;
2264
2265 r_skb = nlmsg_new(len, GFP_ATOMIC);
2266 if (!r_skb)
2267 return -ENOMEM;
2268
2269 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2270 if (!r_nlh) {
2271 kfree_skb(r_skb);
2272 return -EMSGSIZE;
2273 }
2274
2275 r_up = nlmsg_data(r_nlh);
2276 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2277 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2278 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2279 nlmsg_end(r_skb, r_nlh);
2280
2281 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2282 }
2283
xfrm_get_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2284 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2285 struct nlattr **attrs,
2286 struct netlink_ext_ack *extack)
2287 {
2288 struct net *net = sock_net(skb->sk);
2289 struct xfrm_policy *xp;
2290 struct xfrm_userpolicy_id *p;
2291 u8 type = XFRM_POLICY_TYPE_MAIN;
2292 int err;
2293 struct km_event c;
2294 int delete;
2295 struct xfrm_mark m;
2296 u32 if_id = 0;
2297
2298 p = nlmsg_data(nlh);
2299 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2300
2301 err = copy_from_user_policy_type(&type, attrs, extack);
2302 if (err)
2303 return err;
2304
2305 err = verify_policy_dir(p->dir, extack);
2306 if (err)
2307 return err;
2308
2309 if (attrs[XFRMA_IF_ID])
2310 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2311
2312 xfrm_mark_get(attrs, &m);
2313
2314 if (p->index)
2315 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2316 p->index, delete, &err);
2317 else {
2318 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2319 struct xfrm_sec_ctx *ctx;
2320
2321 err = verify_sec_ctx_len(attrs, extack);
2322 if (err)
2323 return err;
2324
2325 ctx = NULL;
2326 if (rt) {
2327 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2328
2329 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2330 if (err)
2331 return err;
2332 }
2333 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2334 &p->sel, ctx, delete, &err);
2335 security_xfrm_policy_free(ctx);
2336 }
2337 if (xp == NULL)
2338 return -ENOENT;
2339
2340 if (!delete) {
2341 struct sk_buff *resp_skb;
2342
2343 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2344 if (IS_ERR(resp_skb)) {
2345 err = PTR_ERR(resp_skb);
2346 } else {
2347 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2348 NETLINK_CB(skb).portid);
2349 }
2350 } else {
2351 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2352
2353 if (err != 0)
2354 goto out;
2355
2356 c.data.byid = p->index;
2357 c.event = nlh->nlmsg_type;
2358 c.seq = nlh->nlmsg_seq;
2359 c.portid = nlh->nlmsg_pid;
2360 km_policy_notify(xp, p->dir, &c);
2361 }
2362
2363 out:
2364 xfrm_pol_put(xp);
2365 return err;
2366 }
2367
xfrm_flush_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2368 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2369 struct nlattr **attrs,
2370 struct netlink_ext_ack *extack)
2371 {
2372 struct net *net = sock_net(skb->sk);
2373 struct km_event c;
2374 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2375 int err;
2376
2377 err = xfrm_state_flush(net, p->proto, true, false);
2378 if (err) {
2379 if (err == -ESRCH) /* empty table */
2380 return 0;
2381 return err;
2382 }
2383 c.data.proto = p->proto;
2384 c.event = nlh->nlmsg_type;
2385 c.seq = nlh->nlmsg_seq;
2386 c.portid = nlh->nlmsg_pid;
2387 c.net = net;
2388 km_state_notify(NULL, &c);
2389
2390 return 0;
2391 }
2392
xfrm_aevent_msgsize(struct xfrm_state * x)2393 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2394 {
2395 unsigned int replay_size = x->replay_esn ?
2396 xfrm_replay_state_esn_len(x->replay_esn) :
2397 sizeof(struct xfrm_replay_state);
2398
2399 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2400 + nla_total_size(replay_size)
2401 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2402 + nla_total_size(sizeof(struct xfrm_mark))
2403 + nla_total_size(4) /* XFRM_AE_RTHR */
2404 + nla_total_size(4); /* XFRM_AE_ETHR */
2405 }
2406
build_aevent(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2407 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2408 {
2409 struct xfrm_aevent_id *id;
2410 struct nlmsghdr *nlh;
2411 int err;
2412
2413 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2414 if (nlh == NULL)
2415 return -EMSGSIZE;
2416
2417 id = nlmsg_data(nlh);
2418 memset(&id->sa_id, 0, sizeof(id->sa_id));
2419 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2420 id->sa_id.spi = x->id.spi;
2421 id->sa_id.family = x->props.family;
2422 id->sa_id.proto = x->id.proto;
2423 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2424 id->reqid = x->props.reqid;
2425 id->flags = c->data.aevent;
2426
2427 if (x->replay_esn) {
2428 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2429 xfrm_replay_state_esn_len(x->replay_esn),
2430 x->replay_esn);
2431 } else {
2432 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2433 &x->replay);
2434 }
2435 if (err)
2436 goto out_cancel;
2437 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2438 XFRMA_PAD);
2439 if (err)
2440 goto out_cancel;
2441
2442 if (id->flags & XFRM_AE_RTHR) {
2443 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2444 if (err)
2445 goto out_cancel;
2446 }
2447 if (id->flags & XFRM_AE_ETHR) {
2448 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2449 x->replay_maxage * 10 / HZ);
2450 if (err)
2451 goto out_cancel;
2452 }
2453 err = xfrm_mark_put(skb, &x->mark);
2454 if (err)
2455 goto out_cancel;
2456
2457 err = xfrm_if_id_put(skb, x->if_id);
2458 if (err)
2459 goto out_cancel;
2460
2461 nlmsg_end(skb, nlh);
2462 return 0;
2463
2464 out_cancel:
2465 nlmsg_cancel(skb, nlh);
2466 return err;
2467 }
2468
xfrm_get_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2469 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2470 struct nlattr **attrs, struct netlink_ext_ack *extack)
2471 {
2472 struct net *net = sock_net(skb->sk);
2473 struct xfrm_state *x;
2474 struct sk_buff *r_skb;
2475 int err;
2476 struct km_event c;
2477 u32 mark;
2478 struct xfrm_mark m;
2479 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2480 struct xfrm_usersa_id *id = &p->sa_id;
2481
2482 mark = xfrm_mark_get(attrs, &m);
2483
2484 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2485 if (x == NULL)
2486 return -ESRCH;
2487
2488 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2489 if (r_skb == NULL) {
2490 xfrm_state_put(x);
2491 return -ENOMEM;
2492 }
2493
2494 /*
2495 * XXX: is this lock really needed - none of the other
2496 * gets lock (the concern is things getting updated
2497 * while we are still reading) - jhs
2498 */
2499 spin_lock_bh(&x->lock);
2500 c.data.aevent = p->flags;
2501 c.seq = nlh->nlmsg_seq;
2502 c.portid = nlh->nlmsg_pid;
2503
2504 err = build_aevent(r_skb, x, &c);
2505 BUG_ON(err < 0);
2506
2507 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2508 spin_unlock_bh(&x->lock);
2509 xfrm_state_put(x);
2510 return err;
2511 }
2512
xfrm_new_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2513 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2514 struct nlattr **attrs, struct netlink_ext_ack *extack)
2515 {
2516 struct net *net = sock_net(skb->sk);
2517 struct xfrm_state *x;
2518 struct km_event c;
2519 int err = -EINVAL;
2520 u32 mark = 0;
2521 struct xfrm_mark m;
2522 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2523 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2524 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2525 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2526 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2527 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2528
2529 if (!lt && !rp && !re && !et && !rt) {
2530 NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
2531 return err;
2532 }
2533
2534 /* pedantic mode - thou shalt sayeth replaceth */
2535 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
2536 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
2537 return err;
2538 }
2539
2540 mark = xfrm_mark_get(attrs, &m);
2541
2542 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2543 if (x == NULL)
2544 return -ESRCH;
2545
2546 if (x->km.state != XFRM_STATE_VALID) {
2547 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2548 goto out;
2549 }
2550
2551 err = xfrm_replay_verify_len(x->replay_esn, re, extack);
2552 if (err)
2553 goto out;
2554
2555 spin_lock_bh(&x->lock);
2556 xfrm_update_ae_params(x, attrs, 1);
2557 spin_unlock_bh(&x->lock);
2558
2559 c.event = nlh->nlmsg_type;
2560 c.seq = nlh->nlmsg_seq;
2561 c.portid = nlh->nlmsg_pid;
2562 c.data.aevent = XFRM_AE_CU;
2563 km_state_notify(x, &c);
2564 err = 0;
2565 out:
2566 xfrm_state_put(x);
2567 return err;
2568 }
2569
xfrm_flush_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2570 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2571 struct nlattr **attrs,
2572 struct netlink_ext_ack *extack)
2573 {
2574 struct net *net = sock_net(skb->sk);
2575 struct km_event c;
2576 u8 type = XFRM_POLICY_TYPE_MAIN;
2577 int err;
2578
2579 err = copy_from_user_policy_type(&type, attrs, extack);
2580 if (err)
2581 return err;
2582
2583 err = xfrm_policy_flush(net, type, true);
2584 if (err) {
2585 if (err == -ESRCH) /* empty table */
2586 return 0;
2587 return err;
2588 }
2589
2590 c.data.type = type;
2591 c.event = nlh->nlmsg_type;
2592 c.seq = nlh->nlmsg_seq;
2593 c.portid = nlh->nlmsg_pid;
2594 c.net = net;
2595 km_policy_notify(NULL, 0, &c);
2596 return 0;
2597 }
2598
xfrm_add_pol_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2599 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2600 struct nlattr **attrs,
2601 struct netlink_ext_ack *extack)
2602 {
2603 struct net *net = sock_net(skb->sk);
2604 struct xfrm_policy *xp;
2605 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2606 struct xfrm_userpolicy_info *p = &up->pol;
2607 u8 type = XFRM_POLICY_TYPE_MAIN;
2608 int err = -ENOENT;
2609 struct xfrm_mark m;
2610 u32 if_id = 0;
2611
2612 err = copy_from_user_policy_type(&type, attrs, extack);
2613 if (err)
2614 return err;
2615
2616 err = verify_policy_dir(p->dir, extack);
2617 if (err)
2618 return err;
2619
2620 if (attrs[XFRMA_IF_ID])
2621 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2622
2623 xfrm_mark_get(attrs, &m);
2624
2625 if (p->index)
2626 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2627 0, &err);
2628 else {
2629 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2630 struct xfrm_sec_ctx *ctx;
2631
2632 err = verify_sec_ctx_len(attrs, extack);
2633 if (err)
2634 return err;
2635
2636 ctx = NULL;
2637 if (rt) {
2638 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2639
2640 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2641 if (err)
2642 return err;
2643 }
2644 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2645 &p->sel, ctx, 0, &err);
2646 security_xfrm_policy_free(ctx);
2647 }
2648 if (xp == NULL)
2649 return -ENOENT;
2650
2651 if (unlikely(xp->walk.dead))
2652 goto out;
2653
2654 err = 0;
2655 if (up->hard) {
2656 xfrm_policy_delete(xp, p->dir);
2657 xfrm_audit_policy_delete(xp, 1, true);
2658 }
2659 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2660
2661 out:
2662 xfrm_pol_put(xp);
2663 return err;
2664 }
2665
xfrm_add_sa_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2666 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2667 struct nlattr **attrs,
2668 struct netlink_ext_ack *extack)
2669 {
2670 struct net *net = sock_net(skb->sk);
2671 struct xfrm_state *x;
2672 int err;
2673 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2674 struct xfrm_usersa_info *p = &ue->state;
2675 struct xfrm_mark m;
2676 u32 mark = xfrm_mark_get(attrs, &m);
2677
2678 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2679
2680 err = -ENOENT;
2681 if (x == NULL)
2682 return err;
2683
2684 spin_lock_bh(&x->lock);
2685 err = -EINVAL;
2686 if (x->km.state != XFRM_STATE_VALID) {
2687 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2688 goto out;
2689 }
2690
2691 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2692
2693 if (ue->hard) {
2694 __xfrm_state_delete(x);
2695 xfrm_audit_state_delete(x, 1, true);
2696 }
2697 err = 0;
2698 out:
2699 spin_unlock_bh(&x->lock);
2700 xfrm_state_put(x);
2701 return err;
2702 }
2703
xfrm_add_acquire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2704 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2705 struct nlattr **attrs,
2706 struct netlink_ext_ack *extack)
2707 {
2708 struct net *net = sock_net(skb->sk);
2709 struct xfrm_policy *xp;
2710 struct xfrm_user_tmpl *ut;
2711 int i;
2712 struct nlattr *rt = attrs[XFRMA_TMPL];
2713 struct xfrm_mark mark;
2714
2715 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2716 struct xfrm_state *x = xfrm_state_alloc(net);
2717 int err = -ENOMEM;
2718
2719 if (!x)
2720 goto nomem;
2721
2722 xfrm_mark_get(attrs, &mark);
2723
2724 err = verify_newpolicy_info(&ua->policy, extack);
2725 if (err)
2726 goto free_state;
2727 err = verify_sec_ctx_len(attrs, extack);
2728 if (err)
2729 goto free_state;
2730
2731 /* build an XP */
2732 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
2733 if (!xp)
2734 goto free_state;
2735
2736 memcpy(&x->id, &ua->id, sizeof(ua->id));
2737 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2738 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2739 xp->mark.m = x->mark.m = mark.m;
2740 xp->mark.v = x->mark.v = mark.v;
2741 ut = nla_data(rt);
2742 /* extract the templates and for each call km_key */
2743 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2744 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2745 memcpy(&x->id, &t->id, sizeof(x->id));
2746 x->props.mode = t->mode;
2747 x->props.reqid = t->reqid;
2748 x->props.family = ut->family;
2749 t->aalgos = ua->aalgos;
2750 t->ealgos = ua->ealgos;
2751 t->calgos = ua->calgos;
2752 err = km_query(x, t, xp);
2753
2754 }
2755
2756 xfrm_state_free(x);
2757 kfree(xp);
2758
2759 return 0;
2760
2761 free_state:
2762 xfrm_state_free(x);
2763 nomem:
2764 return err;
2765 }
2766
2767 #ifdef CONFIG_XFRM_MIGRATE
copy_from_user_migrate(struct xfrm_migrate * ma,struct xfrm_kmaddress * k,struct nlattr ** attrs,int * num,struct netlink_ext_ack * extack)2768 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2769 struct xfrm_kmaddress *k,
2770 struct nlattr **attrs, int *num,
2771 struct netlink_ext_ack *extack)
2772 {
2773 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2774 struct xfrm_user_migrate *um;
2775 int i, num_migrate;
2776
2777 if (k != NULL) {
2778 struct xfrm_user_kmaddress *uk;
2779
2780 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2781 memcpy(&k->local, &uk->local, sizeof(k->local));
2782 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2783 k->family = uk->family;
2784 k->reserved = uk->reserved;
2785 }
2786
2787 um = nla_data(rt);
2788 num_migrate = nla_len(rt) / sizeof(*um);
2789
2790 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) {
2791 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
2792 return -EINVAL;
2793 }
2794
2795 for (i = 0; i < num_migrate; i++, um++, ma++) {
2796 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2797 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2798 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2799 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2800
2801 ma->proto = um->proto;
2802 ma->mode = um->mode;
2803 ma->reqid = um->reqid;
2804
2805 ma->old_family = um->old_family;
2806 ma->new_family = um->new_family;
2807 }
2808
2809 *num = i;
2810 return 0;
2811 }
2812
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2813 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2814 struct nlattr **attrs, struct netlink_ext_ack *extack)
2815 {
2816 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2817 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2818 struct xfrm_kmaddress km, *kmp;
2819 u8 type;
2820 int err;
2821 int n = 0;
2822 struct net *net = sock_net(skb->sk);
2823 struct xfrm_encap_tmpl *encap = NULL;
2824 u32 if_id = 0;
2825
2826 if (!attrs[XFRMA_MIGRATE]) {
2827 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
2828 return -EINVAL;
2829 }
2830
2831 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2832
2833 err = copy_from_user_policy_type(&type, attrs, extack);
2834 if (err)
2835 return err;
2836
2837 err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
2838 if (err)
2839 return err;
2840
2841 if (!n)
2842 return 0;
2843
2844 if (attrs[XFRMA_ENCAP]) {
2845 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2846 sizeof(*encap), GFP_KERNEL);
2847 if (!encap)
2848 return -ENOMEM;
2849 }
2850
2851 if (attrs[XFRMA_IF_ID])
2852 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2853
2854 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
2855 if_id, extack);
2856
2857 kfree(encap);
2858
2859 return err;
2860 }
2861 #else
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs,struct netlink_ext_ack * extack)2862 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2863 struct nlattr **attrs, struct netlink_ext_ack *extack)
2864 {
2865 return -ENOPROTOOPT;
2866 }
2867 #endif
2868
2869 #ifdef CONFIG_XFRM_MIGRATE
copy_to_user_migrate(const struct xfrm_migrate * m,struct sk_buff * skb)2870 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2871 {
2872 struct xfrm_user_migrate um;
2873
2874 memset(&um, 0, sizeof(um));
2875 um.proto = m->proto;
2876 um.mode = m->mode;
2877 um.reqid = m->reqid;
2878 um.old_family = m->old_family;
2879 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2880 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2881 um.new_family = m->new_family;
2882 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2883 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2884
2885 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2886 }
2887
copy_to_user_kmaddress(const struct xfrm_kmaddress * k,struct sk_buff * skb)2888 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2889 {
2890 struct xfrm_user_kmaddress uk;
2891
2892 memset(&uk, 0, sizeof(uk));
2893 uk.family = k->family;
2894 uk.reserved = k->reserved;
2895 memcpy(&uk.local, &k->local, sizeof(uk.local));
2896 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2897
2898 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2899 }
2900
xfrm_migrate_msgsize(int num_migrate,int with_kma,int with_encp)2901 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2902 int with_encp)
2903 {
2904 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2905 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2906 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2907 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2908 + userpolicy_type_attrsize();
2909 }
2910
build_migrate(struct sk_buff * skb,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_selector * sel,const struct xfrm_encap_tmpl * encap,u8 dir,u8 type)2911 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2912 int num_migrate, const struct xfrm_kmaddress *k,
2913 const struct xfrm_selector *sel,
2914 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2915 {
2916 const struct xfrm_migrate *mp;
2917 struct xfrm_userpolicy_id *pol_id;
2918 struct nlmsghdr *nlh;
2919 int i, err;
2920
2921 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2922 if (nlh == NULL)
2923 return -EMSGSIZE;
2924
2925 pol_id = nlmsg_data(nlh);
2926 /* copy data from selector, dir, and type to the pol_id */
2927 memset(pol_id, 0, sizeof(*pol_id));
2928 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2929 pol_id->dir = dir;
2930
2931 if (k != NULL) {
2932 err = copy_to_user_kmaddress(k, skb);
2933 if (err)
2934 goto out_cancel;
2935 }
2936 if (encap) {
2937 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2938 if (err)
2939 goto out_cancel;
2940 }
2941 err = copy_to_user_policy_type(type, skb);
2942 if (err)
2943 goto out_cancel;
2944 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2945 err = copy_to_user_migrate(mp, skb);
2946 if (err)
2947 goto out_cancel;
2948 }
2949
2950 nlmsg_end(skb, nlh);
2951 return 0;
2952
2953 out_cancel:
2954 nlmsg_cancel(skb, nlh);
2955 return err;
2956 }
2957
xfrm_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)2958 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2959 const struct xfrm_migrate *m, int num_migrate,
2960 const struct xfrm_kmaddress *k,
2961 const struct xfrm_encap_tmpl *encap)
2962 {
2963 struct net *net = &init_net;
2964 struct sk_buff *skb;
2965 int err;
2966
2967 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2968 GFP_ATOMIC);
2969 if (skb == NULL)
2970 return -ENOMEM;
2971
2972 /* build migrate */
2973 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2974 BUG_ON(err < 0);
2975
2976 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2977 }
2978 #else
xfrm_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)2979 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2980 const struct xfrm_migrate *m, int num_migrate,
2981 const struct xfrm_kmaddress *k,
2982 const struct xfrm_encap_tmpl *encap)
2983 {
2984 return -ENOPROTOOPT;
2985 }
2986 #endif
2987
2988 #define XMSGSIZE(type) sizeof(struct type)
2989
2990 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2991 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2992 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2993 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2994 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2995 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2996 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2997 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2998 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2999 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
3000 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3001 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3002 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
3003 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
3004 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
3005 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3006 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3007 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
3008 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3009 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
3010 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3011 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3012 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3013 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3014 };
3015 EXPORT_SYMBOL_GPL(xfrm_msg_min);
3016
3017 #undef XMSGSIZE
3018
3019 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
3020 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
3021 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
3022 [XFRMA_LASTUSED] = { .type = NLA_U64},
3023 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
3024 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
3025 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
3026 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
3027 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
3028 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
3029 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
3030 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
3031 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
3032 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
3033 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
3034 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
3035 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
3036 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
3037 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
3038 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
3039 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
3040 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
3041 [XFRMA_TFCPAD] = { .type = NLA_U32 },
3042 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
3043 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
3044 [XFRMA_PROTO] = { .type = NLA_U8 },
3045 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
3046 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
3047 [XFRMA_SET_MARK] = { .type = NLA_U32 },
3048 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
3049 [XFRMA_IF_ID] = { .type = NLA_U32 },
3050 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
3051 };
3052 EXPORT_SYMBOL_GPL(xfrma_policy);
3053
3054 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
3055 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3056 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3057 };
3058
3059 static const struct xfrm_link {
3060 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **,
3061 struct netlink_ext_ack *);
3062 int (*start)(struct netlink_callback *);
3063 int (*dump)(struct sk_buff *, struct netlink_callback *);
3064 int (*done)(struct netlink_callback *);
3065 const struct nla_policy *nla_pol;
3066 int nla_max;
3067 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
3068 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3069 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
3070 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
3071 .dump = xfrm_dump_sa,
3072 .done = xfrm_dump_sa_done },
3073 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3074 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
3075 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
3076 .start = xfrm_dump_policy_start,
3077 .dump = xfrm_dump_policy,
3078 .done = xfrm_dump_policy_done },
3079 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
3080 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
3081 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
3082 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3083 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3084 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
3085 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
3086 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
3087 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
3088 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
3089 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
3090 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
3091 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
3092 .nla_pol = xfrma_spd_policy,
3093 .nla_max = XFRMA_SPD_MAX },
3094 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
3095 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
3096 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
3097 };
3098
xfrm_user_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)3099 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
3100 struct netlink_ext_ack *extack)
3101 {
3102 struct net *net = sock_net(skb->sk);
3103 struct nlattr *attrs[XFRMA_MAX+1];
3104 const struct xfrm_link *link;
3105 struct nlmsghdr *nlh64 = NULL;
3106 int type, err;
3107
3108 type = nlh->nlmsg_type;
3109 if (type > XFRM_MSG_MAX)
3110 return -EINVAL;
3111
3112 type -= XFRM_MSG_BASE;
3113 link = &xfrm_dispatch[type];
3114
3115 /* All operations require privileges, even GET */
3116 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
3117 return -EPERM;
3118
3119 if (in_compat_syscall()) {
3120 struct xfrm_translator *xtr = xfrm_get_translator();
3121
3122 if (!xtr)
3123 return -EOPNOTSUPP;
3124
3125 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
3126 link->nla_pol, extack);
3127 xfrm_put_translator(xtr);
3128 if (IS_ERR(nlh64))
3129 return PTR_ERR(nlh64);
3130 if (nlh64)
3131 nlh = nlh64;
3132 }
3133
3134 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
3135 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
3136 (nlh->nlmsg_flags & NLM_F_DUMP)) {
3137 struct netlink_dump_control c = {
3138 .start = link->start,
3139 .dump = link->dump,
3140 .done = link->done,
3141 };
3142
3143 if (link->dump == NULL) {
3144 err = -EINVAL;
3145 goto err;
3146 }
3147
3148 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
3149 goto err;
3150 }
3151
3152 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
3153 link->nla_max ? : XFRMA_MAX,
3154 link->nla_pol ? : xfrma_policy, extack);
3155 if (err < 0)
3156 goto err;
3157
3158 if (link->doit == NULL) {
3159 err = -EINVAL;
3160 goto err;
3161 }
3162
3163 err = link->doit(skb, nlh, attrs, extack);
3164
3165 /* We need to free skb allocated in xfrm_alloc_compat() before
3166 * returning from this function, because consume_skb() won't take
3167 * care of frag_list since netlink destructor sets
3168 * sbk->head to NULL. (see netlink_skb_destructor())
3169 */
3170 if (skb_has_frag_list(skb)) {
3171 kfree_skb(skb_shinfo(skb)->frag_list);
3172 skb_shinfo(skb)->frag_list = NULL;
3173 }
3174
3175 err:
3176 kvfree(nlh64);
3177 return err;
3178 }
3179
xfrm_netlink_rcv(struct sk_buff * skb)3180 static void xfrm_netlink_rcv(struct sk_buff *skb)
3181 {
3182 struct net *net = sock_net(skb->sk);
3183
3184 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3185 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
3186 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3187 }
3188
xfrm_expire_msgsize(void)3189 static inline unsigned int xfrm_expire_msgsize(void)
3190 {
3191 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
3192 + nla_total_size(sizeof(struct xfrm_mark));
3193 }
3194
build_expire(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)3195 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
3196 {
3197 struct xfrm_user_expire *ue;
3198 struct nlmsghdr *nlh;
3199 int err;
3200
3201 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
3202 if (nlh == NULL)
3203 return -EMSGSIZE;
3204
3205 ue = nlmsg_data(nlh);
3206 copy_to_user_state(x, &ue->state);
3207 ue->hard = (c->data.hard != 0) ? 1 : 0;
3208 /* clear the padding bytes */
3209 memset_after(ue, 0, hard);
3210
3211 err = xfrm_mark_put(skb, &x->mark);
3212 if (err)
3213 return err;
3214
3215 err = xfrm_if_id_put(skb, x->if_id);
3216 if (err)
3217 return err;
3218
3219 nlmsg_end(skb, nlh);
3220 return 0;
3221 }
3222
xfrm_exp_state_notify(struct xfrm_state * x,const struct km_event * c)3223 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
3224 {
3225 struct net *net = xs_net(x);
3226 struct sk_buff *skb;
3227
3228 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
3229 if (skb == NULL)
3230 return -ENOMEM;
3231
3232 if (build_expire(skb, x, c) < 0) {
3233 kfree_skb(skb);
3234 return -EMSGSIZE;
3235 }
3236
3237 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3238 }
3239
xfrm_aevent_state_notify(struct xfrm_state * x,const struct km_event * c)3240 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3241 {
3242 struct net *net = xs_net(x);
3243 struct sk_buff *skb;
3244 int err;
3245
3246 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3247 if (skb == NULL)
3248 return -ENOMEM;
3249
3250 err = build_aevent(skb, x, c);
3251 BUG_ON(err < 0);
3252
3253 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3254 }
3255
xfrm_notify_sa_flush(const struct km_event * c)3256 static int xfrm_notify_sa_flush(const struct km_event *c)
3257 {
3258 struct net *net = c->net;
3259 struct xfrm_usersa_flush *p;
3260 struct nlmsghdr *nlh;
3261 struct sk_buff *skb;
3262 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3263
3264 skb = nlmsg_new(len, GFP_ATOMIC);
3265 if (skb == NULL)
3266 return -ENOMEM;
3267
3268 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3269 if (nlh == NULL) {
3270 kfree_skb(skb);
3271 return -EMSGSIZE;
3272 }
3273
3274 p = nlmsg_data(nlh);
3275 p->proto = c->data.proto;
3276
3277 nlmsg_end(skb, nlh);
3278
3279 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3280 }
3281
xfrm_sa_len(struct xfrm_state * x)3282 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3283 {
3284 unsigned int l = 0;
3285 if (x->aead)
3286 l += nla_total_size(aead_len(x->aead));
3287 if (x->aalg) {
3288 l += nla_total_size(sizeof(struct xfrm_algo) +
3289 (x->aalg->alg_key_len + 7) / 8);
3290 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3291 }
3292 if (x->ealg)
3293 l += nla_total_size(xfrm_alg_len(x->ealg));
3294 if (x->calg)
3295 l += nla_total_size(sizeof(*x->calg));
3296 if (x->encap)
3297 l += nla_total_size(sizeof(*x->encap));
3298 if (x->tfcpad)
3299 l += nla_total_size(sizeof(x->tfcpad));
3300 if (x->replay_esn)
3301 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3302 else
3303 l += nla_total_size(sizeof(struct xfrm_replay_state));
3304 if (x->security)
3305 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3306 x->security->ctx_len);
3307 if (x->coaddr)
3308 l += nla_total_size(sizeof(*x->coaddr));
3309 if (x->props.extra_flags)
3310 l += nla_total_size(sizeof(x->props.extra_flags));
3311 if (x->xso.dev)
3312 l += nla_total_size(sizeof(struct xfrm_user_offload));
3313 if (x->props.smark.v | x->props.smark.m) {
3314 l += nla_total_size(sizeof(x->props.smark.v));
3315 l += nla_total_size(sizeof(x->props.smark.m));
3316 }
3317 if (x->if_id)
3318 l += nla_total_size(sizeof(x->if_id));
3319
3320 /* Must count x->lastused as it may become non-zero behind our back. */
3321 l += nla_total_size_64bit(sizeof(u64));
3322
3323 if (x->mapping_maxage)
3324 l += nla_total_size(sizeof(x->mapping_maxage));
3325
3326 return l;
3327 }
3328
xfrm_notify_sa(struct xfrm_state * x,const struct km_event * c)3329 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3330 {
3331 struct net *net = xs_net(x);
3332 struct xfrm_usersa_info *p;
3333 struct xfrm_usersa_id *id;
3334 struct nlmsghdr *nlh;
3335 struct sk_buff *skb;
3336 unsigned int len = xfrm_sa_len(x);
3337 unsigned int headlen;
3338 int err;
3339
3340 headlen = sizeof(*p);
3341 if (c->event == XFRM_MSG_DELSA) {
3342 len += nla_total_size(headlen);
3343 headlen = sizeof(*id);
3344 len += nla_total_size(sizeof(struct xfrm_mark));
3345 }
3346 len += NLMSG_ALIGN(headlen);
3347
3348 skb = nlmsg_new(len, GFP_ATOMIC);
3349 if (skb == NULL)
3350 return -ENOMEM;
3351
3352 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3353 err = -EMSGSIZE;
3354 if (nlh == NULL)
3355 goto out_free_skb;
3356
3357 p = nlmsg_data(nlh);
3358 if (c->event == XFRM_MSG_DELSA) {
3359 struct nlattr *attr;
3360
3361 id = nlmsg_data(nlh);
3362 memset(id, 0, sizeof(*id));
3363 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3364 id->spi = x->id.spi;
3365 id->family = x->props.family;
3366 id->proto = x->id.proto;
3367
3368 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3369 err = -EMSGSIZE;
3370 if (attr == NULL)
3371 goto out_free_skb;
3372
3373 p = nla_data(attr);
3374 }
3375 err = copy_to_user_state_extra(x, p, skb);
3376 if (err)
3377 goto out_free_skb;
3378
3379 nlmsg_end(skb, nlh);
3380
3381 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3382
3383 out_free_skb:
3384 kfree_skb(skb);
3385 return err;
3386 }
3387
xfrm_send_state_notify(struct xfrm_state * x,const struct km_event * c)3388 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3389 {
3390
3391 switch (c->event) {
3392 case XFRM_MSG_EXPIRE:
3393 return xfrm_exp_state_notify(x, c);
3394 case XFRM_MSG_NEWAE:
3395 return xfrm_aevent_state_notify(x, c);
3396 case XFRM_MSG_DELSA:
3397 case XFRM_MSG_UPDSA:
3398 case XFRM_MSG_NEWSA:
3399 return xfrm_notify_sa(x, c);
3400 case XFRM_MSG_FLUSHSA:
3401 return xfrm_notify_sa_flush(c);
3402 default:
3403 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3404 c->event);
3405 break;
3406 }
3407
3408 return 0;
3409
3410 }
3411
xfrm_acquire_msgsize(struct xfrm_state * x,struct xfrm_policy * xp)3412 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3413 struct xfrm_policy *xp)
3414 {
3415 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3416 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3417 + nla_total_size(sizeof(struct xfrm_mark))
3418 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3419 + userpolicy_type_attrsize();
3420 }
3421
build_acquire(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3422 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3423 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3424 {
3425 __u32 seq = xfrm_get_acqseq();
3426 struct xfrm_user_acquire *ua;
3427 struct nlmsghdr *nlh;
3428 int err;
3429
3430 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3431 if (nlh == NULL)
3432 return -EMSGSIZE;
3433
3434 ua = nlmsg_data(nlh);
3435 memcpy(&ua->id, &x->id, sizeof(ua->id));
3436 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3437 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3438 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3439 ua->aalgos = xt->aalgos;
3440 ua->ealgos = xt->ealgos;
3441 ua->calgos = xt->calgos;
3442 ua->seq = x->km.seq = seq;
3443
3444 err = copy_to_user_tmpl(xp, skb);
3445 if (!err)
3446 err = copy_to_user_state_sec_ctx(x, skb);
3447 if (!err)
3448 err = copy_to_user_policy_type(xp->type, skb);
3449 if (!err)
3450 err = xfrm_mark_put(skb, &xp->mark);
3451 if (!err)
3452 err = xfrm_if_id_put(skb, xp->if_id);
3453 if (!err && xp->xdo.dev)
3454 err = copy_user_offload(&xp->xdo, skb);
3455 if (err) {
3456 nlmsg_cancel(skb, nlh);
3457 return err;
3458 }
3459
3460 nlmsg_end(skb, nlh);
3461 return 0;
3462 }
3463
xfrm_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3464 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3465 struct xfrm_policy *xp)
3466 {
3467 struct net *net = xs_net(x);
3468 struct sk_buff *skb;
3469 int err;
3470
3471 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3472 if (skb == NULL)
3473 return -ENOMEM;
3474
3475 err = build_acquire(skb, x, xt, xp);
3476 BUG_ON(err < 0);
3477
3478 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3479 }
3480
3481 /* User gives us xfrm_user_policy_info followed by an array of 0
3482 * or more templates.
3483 */
xfrm_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3484 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3485 u8 *data, int len, int *dir)
3486 {
3487 struct net *net = sock_net(sk);
3488 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3489 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3490 struct xfrm_policy *xp;
3491 int nr;
3492
3493 switch (sk->sk_family) {
3494 case AF_INET:
3495 if (opt != IP_XFRM_POLICY) {
3496 *dir = -EOPNOTSUPP;
3497 return NULL;
3498 }
3499 break;
3500 #if IS_ENABLED(CONFIG_IPV6)
3501 case AF_INET6:
3502 if (opt != IPV6_XFRM_POLICY) {
3503 *dir = -EOPNOTSUPP;
3504 return NULL;
3505 }
3506 break;
3507 #endif
3508 default:
3509 *dir = -EINVAL;
3510 return NULL;
3511 }
3512
3513 *dir = -EINVAL;
3514
3515 if (len < sizeof(*p) ||
3516 verify_newpolicy_info(p, NULL))
3517 return NULL;
3518
3519 nr = ((len - sizeof(*p)) / sizeof(*ut));
3520 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
3521 return NULL;
3522
3523 if (p->dir > XFRM_POLICY_OUT)
3524 return NULL;
3525
3526 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3527 if (xp == NULL) {
3528 *dir = -ENOBUFS;
3529 return NULL;
3530 }
3531
3532 copy_from_user_policy(xp, p);
3533 xp->type = XFRM_POLICY_TYPE_MAIN;
3534 copy_templates(xp, ut, nr);
3535
3536 *dir = p->dir;
3537
3538 return xp;
3539 }
3540
xfrm_polexpire_msgsize(struct xfrm_policy * xp)3541 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3542 {
3543 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3544 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3545 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3546 + nla_total_size(sizeof(struct xfrm_mark))
3547 + userpolicy_type_attrsize();
3548 }
3549
build_polexpire(struct sk_buff * skb,struct xfrm_policy * xp,int dir,const struct km_event * c)3550 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3551 int dir, const struct km_event *c)
3552 {
3553 struct xfrm_user_polexpire *upe;
3554 int hard = c->data.hard;
3555 struct nlmsghdr *nlh;
3556 int err;
3557
3558 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3559 if (nlh == NULL)
3560 return -EMSGSIZE;
3561
3562 upe = nlmsg_data(nlh);
3563 copy_to_user_policy(xp, &upe->pol, dir);
3564 err = copy_to_user_tmpl(xp, skb);
3565 if (!err)
3566 err = copy_to_user_sec_ctx(xp, skb);
3567 if (!err)
3568 err = copy_to_user_policy_type(xp->type, skb);
3569 if (!err)
3570 err = xfrm_mark_put(skb, &xp->mark);
3571 if (!err)
3572 err = xfrm_if_id_put(skb, xp->if_id);
3573 if (!err && xp->xdo.dev)
3574 err = copy_user_offload(&xp->xdo, skb);
3575 if (err) {
3576 nlmsg_cancel(skb, nlh);
3577 return err;
3578 }
3579 upe->hard = !!hard;
3580
3581 nlmsg_end(skb, nlh);
3582 return 0;
3583 }
3584
xfrm_exp_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3585 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3586 {
3587 struct net *net = xp_net(xp);
3588 struct sk_buff *skb;
3589 int err;
3590
3591 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3592 if (skb == NULL)
3593 return -ENOMEM;
3594
3595 err = build_polexpire(skb, xp, dir, c);
3596 BUG_ON(err < 0);
3597
3598 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3599 }
3600
xfrm_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)3601 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3602 {
3603 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3604 struct net *net = xp_net(xp);
3605 struct xfrm_userpolicy_info *p;
3606 struct xfrm_userpolicy_id *id;
3607 struct nlmsghdr *nlh;
3608 struct sk_buff *skb;
3609 unsigned int headlen;
3610 int err;
3611
3612 headlen = sizeof(*p);
3613 if (c->event == XFRM_MSG_DELPOLICY) {
3614 len += nla_total_size(headlen);
3615 headlen = sizeof(*id);
3616 }
3617 len += userpolicy_type_attrsize();
3618 len += nla_total_size(sizeof(struct xfrm_mark));
3619 len += NLMSG_ALIGN(headlen);
3620
3621 skb = nlmsg_new(len, GFP_ATOMIC);
3622 if (skb == NULL)
3623 return -ENOMEM;
3624
3625 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3626 err = -EMSGSIZE;
3627 if (nlh == NULL)
3628 goto out_free_skb;
3629
3630 p = nlmsg_data(nlh);
3631 if (c->event == XFRM_MSG_DELPOLICY) {
3632 struct nlattr *attr;
3633
3634 id = nlmsg_data(nlh);
3635 memset(id, 0, sizeof(*id));
3636 id->dir = dir;
3637 if (c->data.byid)
3638 id->index = xp->index;
3639 else
3640 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3641
3642 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3643 err = -EMSGSIZE;
3644 if (attr == NULL)
3645 goto out_free_skb;
3646
3647 p = nla_data(attr);
3648 }
3649
3650 copy_to_user_policy(xp, p, dir);
3651 err = copy_to_user_tmpl(xp, skb);
3652 if (!err)
3653 err = copy_to_user_policy_type(xp->type, skb);
3654 if (!err)
3655 err = xfrm_mark_put(skb, &xp->mark);
3656 if (!err)
3657 err = xfrm_if_id_put(skb, xp->if_id);
3658 if (!err && xp->xdo.dev)
3659 err = copy_user_offload(&xp->xdo, skb);
3660 if (err)
3661 goto out_free_skb;
3662
3663 nlmsg_end(skb, nlh);
3664
3665 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3666
3667 out_free_skb:
3668 kfree_skb(skb);
3669 return err;
3670 }
3671
xfrm_notify_policy_flush(const struct km_event * c)3672 static int xfrm_notify_policy_flush(const struct km_event *c)
3673 {
3674 struct net *net = c->net;
3675 struct nlmsghdr *nlh;
3676 struct sk_buff *skb;
3677 int err;
3678
3679 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3680 if (skb == NULL)
3681 return -ENOMEM;
3682
3683 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3684 err = -EMSGSIZE;
3685 if (nlh == NULL)
3686 goto out_free_skb;
3687 err = copy_to_user_policy_type(c->data.type, skb);
3688 if (err)
3689 goto out_free_skb;
3690
3691 nlmsg_end(skb, nlh);
3692
3693 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3694
3695 out_free_skb:
3696 kfree_skb(skb);
3697 return err;
3698 }
3699
xfrm_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3700 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3701 {
3702
3703 switch (c->event) {
3704 case XFRM_MSG_NEWPOLICY:
3705 case XFRM_MSG_UPDPOLICY:
3706 case XFRM_MSG_DELPOLICY:
3707 return xfrm_notify_policy(xp, dir, c);
3708 case XFRM_MSG_FLUSHPOLICY:
3709 return xfrm_notify_policy_flush(c);
3710 case XFRM_MSG_POLEXPIRE:
3711 return xfrm_exp_policy_notify(xp, dir, c);
3712 default:
3713 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3714 c->event);
3715 }
3716
3717 return 0;
3718
3719 }
3720
xfrm_report_msgsize(void)3721 static inline unsigned int xfrm_report_msgsize(void)
3722 {
3723 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3724 }
3725
build_report(struct sk_buff * skb,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3726 static int build_report(struct sk_buff *skb, u8 proto,
3727 struct xfrm_selector *sel, xfrm_address_t *addr)
3728 {
3729 struct xfrm_user_report *ur;
3730 struct nlmsghdr *nlh;
3731
3732 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3733 if (nlh == NULL)
3734 return -EMSGSIZE;
3735
3736 ur = nlmsg_data(nlh);
3737 ur->proto = proto;
3738 memcpy(&ur->sel, sel, sizeof(ur->sel));
3739
3740 if (addr) {
3741 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3742 if (err) {
3743 nlmsg_cancel(skb, nlh);
3744 return err;
3745 }
3746 }
3747 nlmsg_end(skb, nlh);
3748 return 0;
3749 }
3750
xfrm_send_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3751 static int xfrm_send_report(struct net *net, u8 proto,
3752 struct xfrm_selector *sel, xfrm_address_t *addr)
3753 {
3754 struct sk_buff *skb;
3755 int err;
3756
3757 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3758 if (skb == NULL)
3759 return -ENOMEM;
3760
3761 err = build_report(skb, proto, sel, addr);
3762 BUG_ON(err < 0);
3763
3764 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3765 }
3766
xfrm_mapping_msgsize(void)3767 static inline unsigned int xfrm_mapping_msgsize(void)
3768 {
3769 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3770 }
3771
build_mapping(struct sk_buff * skb,struct xfrm_state * x,xfrm_address_t * new_saddr,__be16 new_sport)3772 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3773 xfrm_address_t *new_saddr, __be16 new_sport)
3774 {
3775 struct xfrm_user_mapping *um;
3776 struct nlmsghdr *nlh;
3777
3778 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3779 if (nlh == NULL)
3780 return -EMSGSIZE;
3781
3782 um = nlmsg_data(nlh);
3783
3784 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3785 um->id.spi = x->id.spi;
3786 um->id.family = x->props.family;
3787 um->id.proto = x->id.proto;
3788 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3789 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3790 um->new_sport = new_sport;
3791 um->old_sport = x->encap->encap_sport;
3792 um->reqid = x->props.reqid;
3793
3794 nlmsg_end(skb, nlh);
3795 return 0;
3796 }
3797
xfrm_send_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)3798 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3799 __be16 sport)
3800 {
3801 struct net *net = xs_net(x);
3802 struct sk_buff *skb;
3803 int err;
3804
3805 if (x->id.proto != IPPROTO_ESP)
3806 return -EINVAL;
3807
3808 if (!x->encap)
3809 return -EINVAL;
3810
3811 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3812 if (skb == NULL)
3813 return -ENOMEM;
3814
3815 err = build_mapping(skb, x, ipaddr, sport);
3816 BUG_ON(err < 0);
3817
3818 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3819 }
3820
xfrm_is_alive(const struct km_event * c)3821 static bool xfrm_is_alive(const struct km_event *c)
3822 {
3823 return (bool)xfrm_acquire_is_on(c->net);
3824 }
3825
3826 static struct xfrm_mgr netlink_mgr = {
3827 .notify = xfrm_send_state_notify,
3828 .acquire = xfrm_send_acquire,
3829 .compile_policy = xfrm_compile_policy,
3830 .notify_policy = xfrm_send_policy_notify,
3831 .report = xfrm_send_report,
3832 .migrate = xfrm_send_migrate,
3833 .new_mapping = xfrm_send_mapping,
3834 .is_alive = xfrm_is_alive,
3835 };
3836
xfrm_user_net_init(struct net * net)3837 static int __net_init xfrm_user_net_init(struct net *net)
3838 {
3839 struct sock *nlsk;
3840 struct netlink_kernel_cfg cfg = {
3841 .groups = XFRMNLGRP_MAX,
3842 .input = xfrm_netlink_rcv,
3843 };
3844
3845 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3846 if (nlsk == NULL)
3847 return -ENOMEM;
3848 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3849 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3850 return 0;
3851 }
3852
xfrm_user_net_pre_exit(struct net * net)3853 static void __net_exit xfrm_user_net_pre_exit(struct net *net)
3854 {
3855 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3856 }
3857
xfrm_user_net_exit(struct list_head * net_exit_list)3858 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3859 {
3860 struct net *net;
3861
3862 list_for_each_entry(net, net_exit_list, exit_list)
3863 netlink_kernel_release(net->xfrm.nlsk_stash);
3864 }
3865
3866 static struct pernet_operations xfrm_user_net_ops = {
3867 .init = xfrm_user_net_init,
3868 .pre_exit = xfrm_user_net_pre_exit,
3869 .exit_batch = xfrm_user_net_exit,
3870 };
3871
xfrm_user_init(void)3872 static int __init xfrm_user_init(void)
3873 {
3874 int rv;
3875
3876 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3877
3878 rv = register_pernet_subsys(&xfrm_user_net_ops);
3879 if (rv < 0)
3880 return rv;
3881 xfrm_register_km(&netlink_mgr);
3882 return 0;
3883 }
3884
xfrm_user_exit(void)3885 static void __exit xfrm_user_exit(void)
3886 {
3887 xfrm_unregister_km(&netlink_mgr);
3888 unregister_pernet_subsys(&xfrm_user_net_ops);
3889 }
3890
3891 module_init(xfrm_user_init);
3892 module_exit(xfrm_user_exit);
3893 MODULE_LICENSE("GPL");
3894 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3895