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
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
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
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
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
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
132 static inline int verify_replay(struct xfrm_usersa_info *p,
133 struct nlattr **attrs, u8 sa_dir,
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 if (sa_dir == XFRM_SA_DIR_OUT) {
172 if (rs->replay_window) {
173 NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
174 return -EINVAL;
175 }
176 if (rs->seq || rs->seq_hi) {
177 NL_SET_ERR_MSG(extack,
178 "Replay seq and seq_hi should be 0 for output SA");
179 return -EINVAL;
180 }
181 if (rs->bmp_len) {
182 NL_SET_ERR_MSG(extack, "Replay bmp_len should 0 for output SA");
183 return -EINVAL;
184 }
185 }
186
187 if (sa_dir == XFRM_SA_DIR_IN) {
188 if (rs->oseq || rs->oseq_hi) {
189 NL_SET_ERR_MSG(extack,
190 "Replay oseq and oseq_hi should be 0 for input SA");
191 return -EINVAL;
192 }
193 }
194
195 return 0;
196 }
197
198 static int verify_newsa_info(struct xfrm_usersa_info *p,
199 struct nlattr **attrs,
200 struct netlink_ext_ack *extack)
201 {
202 int err;
203 u8 sa_dir = attrs[XFRMA_SA_DIR] ? nla_get_u8(attrs[XFRMA_SA_DIR]) : 0;
204
205 err = -EINVAL;
206 switch (p->family) {
207 case AF_INET:
208 break;
209
210 case AF_INET6:
211 #if IS_ENABLED(CONFIG_IPV6)
212 break;
213 #else
214 err = -EAFNOSUPPORT;
215 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
216 goto out;
217 #endif
218
219 default:
220 NL_SET_ERR_MSG(extack, "Invalid address family");
221 goto out;
222 }
223
224 switch (p->sel.family) {
225 case AF_UNSPEC:
226 break;
227
228 case AF_INET:
229 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
230 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
231 goto out;
232 }
233
234 break;
235
236 case AF_INET6:
237 #if IS_ENABLED(CONFIG_IPV6)
238 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
239 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
240 goto out;
241 }
242
243 break;
244 #else
245 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
246 err = -EAFNOSUPPORT;
247 goto out;
248 #endif
249
250 default:
251 NL_SET_ERR_MSG(extack, "Invalid address family in selector");
252 goto out;
253 }
254
255 err = -EINVAL;
256 switch (p->id.proto) {
257 case IPPROTO_AH:
258 if (!attrs[XFRMA_ALG_AUTH] &&
259 !attrs[XFRMA_ALG_AUTH_TRUNC]) {
260 NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
261 goto out;
262 }
263
264 if (attrs[XFRMA_ALG_AEAD] ||
265 attrs[XFRMA_ALG_CRYPT] ||
266 attrs[XFRMA_ALG_COMP] ||
267 attrs[XFRMA_TFCPAD]) {
268 NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
269 goto out;
270 }
271 break;
272
273 case IPPROTO_ESP:
274 if (attrs[XFRMA_ALG_COMP]) {
275 NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
276 goto out;
277 }
278
279 if (!attrs[XFRMA_ALG_AUTH] &&
280 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
281 !attrs[XFRMA_ALG_CRYPT] &&
282 !attrs[XFRMA_ALG_AEAD]) {
283 NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
284 goto out;
285 }
286
287 if ((attrs[XFRMA_ALG_AUTH] ||
288 attrs[XFRMA_ALG_AUTH_TRUNC] ||
289 attrs[XFRMA_ALG_CRYPT]) &&
290 attrs[XFRMA_ALG_AEAD]) {
291 NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
292 goto out;
293 }
294
295 if (attrs[XFRMA_TFCPAD] &&
296 p->mode != XFRM_MODE_TUNNEL) {
297 NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
298 goto out;
299 }
300 break;
301
302 case IPPROTO_COMP:
303 if (!attrs[XFRMA_ALG_COMP]) {
304 NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
305 goto out;
306 }
307
308 if (attrs[XFRMA_ALG_AEAD] ||
309 attrs[XFRMA_ALG_AUTH] ||
310 attrs[XFRMA_ALG_AUTH_TRUNC] ||
311 attrs[XFRMA_ALG_CRYPT] ||
312 attrs[XFRMA_TFCPAD]) {
313 NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
314 goto out;
315 }
316
317 if (ntohl(p->id.spi) >= 0x10000) {
318 NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
319 goto out;
320 }
321 break;
322
323 #if IS_ENABLED(CONFIG_IPV6)
324 case IPPROTO_DSTOPTS:
325 case IPPROTO_ROUTING:
326 if (attrs[XFRMA_ALG_COMP] ||
327 attrs[XFRMA_ALG_AUTH] ||
328 attrs[XFRMA_ALG_AUTH_TRUNC] ||
329 attrs[XFRMA_ALG_AEAD] ||
330 attrs[XFRMA_ALG_CRYPT] ||
331 attrs[XFRMA_ENCAP] ||
332 attrs[XFRMA_SEC_CTX] ||
333 attrs[XFRMA_TFCPAD]) {
334 NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
335 goto out;
336 }
337
338 if (!attrs[XFRMA_COADDR]) {
339 NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
340 goto out;
341 }
342 break;
343 #endif
344
345 default:
346 NL_SET_ERR_MSG(extack, "Unsupported protocol");
347 goto out;
348 }
349
350 if ((err = verify_aead(attrs, extack)))
351 goto out;
352 if ((err = verify_auth_trunc(attrs, extack)))
353 goto out;
354 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
355 goto out;
356 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
357 goto out;
358 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
359 goto out;
360 if ((err = verify_sec_ctx_len(attrs, extack)))
361 goto out;
362 if ((err = verify_replay(p, attrs, sa_dir, extack)))
363 goto out;
364
365 err = -EINVAL;
366 switch (p->mode) {
367 case XFRM_MODE_TRANSPORT:
368 case XFRM_MODE_TUNNEL:
369 case XFRM_MODE_ROUTEOPTIMIZATION:
370 case XFRM_MODE_BEET:
371 break;
372
373 default:
374 NL_SET_ERR_MSG(extack, "Unsupported mode");
375 goto out;
376 }
377
378 err = 0;
379
380 if (attrs[XFRMA_MTIMER_THRESH]) {
381 if (!attrs[XFRMA_ENCAP]) {
382 NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
383 err = -EINVAL;
384 goto out;
385 }
386
387 if (sa_dir == XFRM_SA_DIR_OUT) {
388 NL_SET_ERR_MSG(extack,
389 "MTIMER_THRESH attribute should not be set on output SA");
390 err = -EINVAL;
391 goto out;
392 }
393 }
394
395 if (sa_dir == XFRM_SA_DIR_OUT) {
396 if (p->flags & XFRM_STATE_DECAP_DSCP) {
397 NL_SET_ERR_MSG(extack, "Flag DECAP_DSCP should not be set for output SA");
398 err = -EINVAL;
399 goto out;
400 }
401
402 if (p->flags & XFRM_STATE_ICMP) {
403 NL_SET_ERR_MSG(extack, "Flag ICMP should not be set for output SA");
404 err = -EINVAL;
405 goto out;
406 }
407
408 if (p->flags & XFRM_STATE_WILDRECV) {
409 NL_SET_ERR_MSG(extack, "Flag WILDRECV should not be set for output SA");
410 err = -EINVAL;
411 goto out;
412 }
413
414 if (p->replay_window) {
415 NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
416 err = -EINVAL;
417 goto out;
418 }
419
420 if (attrs[XFRMA_REPLAY_VAL]) {
421 struct xfrm_replay_state *replay;
422
423 replay = nla_data(attrs[XFRMA_REPLAY_VAL]);
424
425 if (replay->seq || replay->bitmap) {
426 NL_SET_ERR_MSG(extack,
427 "Replay seq and bitmap should be 0 for output SA");
428 err = -EINVAL;
429 goto out;
430 }
431 }
432 }
433
434 if (sa_dir == XFRM_SA_DIR_IN) {
435 if (p->flags & XFRM_STATE_NOPMTUDISC) {
436 NL_SET_ERR_MSG(extack, "Flag NOPMTUDISC should not be set for input SA");
437 err = -EINVAL;
438 goto out;
439 }
440
441 if (attrs[XFRMA_SA_EXTRA_FLAGS]) {
442 u32 xflags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
443
444 if (xflags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) {
445 NL_SET_ERR_MSG(extack, "Flag DONT_ENCAP_DSCP should not be set for input SA");
446 err = -EINVAL;
447 goto out;
448 }
449
450 if (xflags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP) {
451 NL_SET_ERR_MSG(extack, "Flag OSEQ_MAY_WRAP should not be set for input SA");
452 err = -EINVAL;
453 goto out;
454 }
455
456 }
457 }
458
459 out:
460 return err;
461 }
462
463 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
464 struct xfrm_algo_desc *(*get_byname)(const char *, int),
465 struct nlattr *rta, struct netlink_ext_ack *extack)
466 {
467 struct xfrm_algo *p, *ualg;
468 struct xfrm_algo_desc *algo;
469
470 if (!rta)
471 return 0;
472
473 ualg = nla_data(rta);
474
475 algo = get_byname(ualg->alg_name, 1);
476 if (!algo) {
477 NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
478 return -ENOSYS;
479 }
480 *props = algo->desc.sadb_alg_id;
481
482 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
483 if (!p)
484 return -ENOMEM;
485
486 strcpy(p->alg_name, algo->name);
487 *algpp = p;
488 return 0;
489 }
490
491 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
492 struct netlink_ext_ack *extack)
493 {
494 struct xfrm_algo *p, *ualg;
495 struct xfrm_algo_desc *algo;
496
497 if (!rta)
498 return 0;
499
500 ualg = nla_data(rta);
501
502 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
503 if (!algo) {
504 NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
505 return -ENOSYS;
506 }
507 x->props.ealgo = algo->desc.sadb_alg_id;
508
509 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
510 if (!p)
511 return -ENOMEM;
512
513 strcpy(p->alg_name, algo->name);
514 x->ealg = p;
515 x->geniv = algo->uinfo.encr.geniv;
516 return 0;
517 }
518
519 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
520 struct nlattr *rta, struct netlink_ext_ack *extack)
521 {
522 struct xfrm_algo *ualg;
523 struct xfrm_algo_auth *p;
524 struct xfrm_algo_desc *algo;
525
526 if (!rta)
527 return 0;
528
529 ualg = nla_data(rta);
530
531 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
532 if (!algo) {
533 NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
534 return -ENOSYS;
535 }
536 *props = algo->desc.sadb_alg_id;
537
538 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
539 if (!p)
540 return -ENOMEM;
541
542 strcpy(p->alg_name, algo->name);
543 p->alg_key_len = ualg->alg_key_len;
544 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
545 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
546
547 *algpp = p;
548 return 0;
549 }
550
551 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
552 struct nlattr *rta, struct netlink_ext_ack *extack)
553 {
554 struct xfrm_algo_auth *p, *ualg;
555 struct xfrm_algo_desc *algo;
556
557 if (!rta)
558 return 0;
559
560 ualg = nla_data(rta);
561
562 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
563 if (!algo) {
564 NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
565 return -ENOSYS;
566 }
567 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
568 NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
569 return -EINVAL;
570 }
571 *props = algo->desc.sadb_alg_id;
572
573 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
574 if (!p)
575 return -ENOMEM;
576
577 strcpy(p->alg_name, algo->name);
578 if (!p->alg_trunc_len)
579 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
580
581 *algpp = p;
582 return 0;
583 }
584
585 static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
586 struct netlink_ext_ack *extack)
587 {
588 struct xfrm_algo_aead *p, *ualg;
589 struct xfrm_algo_desc *algo;
590
591 if (!rta)
592 return 0;
593
594 ualg = nla_data(rta);
595
596 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
597 if (!algo) {
598 NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
599 return -ENOSYS;
600 }
601 x->props.ealgo = algo->desc.sadb_alg_id;
602
603 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
604 if (!p)
605 return -ENOMEM;
606
607 strcpy(p->alg_name, algo->name);
608 x->aead = p;
609 x->geniv = algo->uinfo.aead.geniv;
610 return 0;
611 }
612
613 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
614 struct nlattr *rp,
615 struct netlink_ext_ack *extack)
616 {
617 struct xfrm_replay_state_esn *up;
618 unsigned int ulen;
619
620 if (!replay_esn || !rp)
621 return 0;
622
623 up = nla_data(rp);
624 ulen = xfrm_replay_state_esn_len(up);
625
626 /* Check the overall length and the internal bitmap length to avoid
627 * potential overflow. */
628 if (nla_len(rp) < (int)ulen) {
629 NL_SET_ERR_MSG(extack, "ESN attribute is too short");
630 return -EINVAL;
631 }
632
633 if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
634 NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
635 return -EINVAL;
636 }
637
638 if (replay_esn->bmp_len != up->bmp_len) {
639 NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
640 return -EINVAL;
641 }
642
643 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
644 NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
645 return -EINVAL;
646 }
647
648 return 0;
649 }
650
651 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
652 struct xfrm_replay_state_esn **preplay_esn,
653 struct nlattr *rta)
654 {
655 struct xfrm_replay_state_esn *p, *pp, *up;
656 unsigned int klen, ulen;
657
658 if (!rta)
659 return 0;
660
661 up = nla_data(rta);
662 klen = xfrm_replay_state_esn_len(up);
663 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
664
665 p = kzalloc(klen, GFP_KERNEL);
666 if (!p)
667 return -ENOMEM;
668
669 pp = kzalloc(klen, GFP_KERNEL);
670 if (!pp) {
671 kfree(p);
672 return -ENOMEM;
673 }
674
675 memcpy(p, up, ulen);
676 memcpy(pp, up, ulen);
677
678 *replay_esn = p;
679 *preplay_esn = pp;
680
681 return 0;
682 }
683
684 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
685 {
686 unsigned int len = 0;
687
688 if (xfrm_ctx) {
689 len += sizeof(struct xfrm_user_sec_ctx);
690 len += xfrm_ctx->ctx_len;
691 }
692 return len;
693 }
694
695 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
696 {
697 memcpy(&x->id, &p->id, sizeof(x->id));
698 memcpy(&x->sel, &p->sel, sizeof(x->sel));
699 memcpy(&x->lft, &p->lft, sizeof(x->lft));
700 x->props.mode = p->mode;
701 x->props.replay_window = min_t(unsigned int, p->replay_window,
702 sizeof(x->replay.bitmap) * 8);
703 x->props.reqid = p->reqid;
704 x->props.family = p->family;
705 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
706 x->props.flags = p->flags;
707
708 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
709 x->sel.family = p->family;
710 }
711
712 /*
713 * someday when pfkey also has support, we could have the code
714 * somehow made shareable and move it to xfrm_state.c - JHS
715 *
716 */
717 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
718 int update_esn)
719 {
720 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
721 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
722 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
723 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
724 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
725 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
726
727 if (re && x->replay_esn && x->preplay_esn) {
728 struct xfrm_replay_state_esn *replay_esn;
729 replay_esn = nla_data(re);
730 memcpy(x->replay_esn, replay_esn,
731 xfrm_replay_state_esn_len(replay_esn));
732 memcpy(x->preplay_esn, replay_esn,
733 xfrm_replay_state_esn_len(replay_esn));
734 }
735
736 if (rp) {
737 struct xfrm_replay_state *replay;
738 replay = nla_data(rp);
739 memcpy(&x->replay, replay, sizeof(*replay));
740 memcpy(&x->preplay, replay, sizeof(*replay));
741 }
742
743 if (lt) {
744 struct xfrm_lifetime_cur *ltime;
745 ltime = nla_data(lt);
746 x->curlft.bytes = ltime->bytes;
747 x->curlft.packets = ltime->packets;
748 x->curlft.add_time = ltime->add_time;
749 x->curlft.use_time = ltime->use_time;
750 }
751
752 if (et)
753 x->replay_maxage = nla_get_u32(et);
754
755 if (rt)
756 x->replay_maxdiff = nla_get_u32(rt);
757
758 if (mt)
759 x->mapping_maxage = nla_get_u32(mt);
760 }
761
762 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
763 {
764 if (attrs[XFRMA_SET_MARK]) {
765 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
766 if (attrs[XFRMA_SET_MARK_MASK])
767 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
768 else
769 m->m = 0xffffffff;
770 } else {
771 m->v = m->m = 0;
772 }
773 }
774
775 static struct xfrm_state *xfrm_state_construct(struct net *net,
776 struct xfrm_usersa_info *p,
777 struct nlattr **attrs,
778 int *errp,
779 struct netlink_ext_ack *extack)
780 {
781 struct xfrm_state *x = xfrm_state_alloc(net);
782 int err = -ENOMEM;
783
784 if (!x)
785 goto error_no_put;
786
787 copy_from_user_state(x, p);
788
789 if (attrs[XFRMA_ENCAP]) {
790 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
791 sizeof(*x->encap), GFP_KERNEL);
792 if (x->encap == NULL)
793 goto error;
794 }
795
796 if (attrs[XFRMA_COADDR]) {
797 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
798 sizeof(*x->coaddr), GFP_KERNEL);
799 if (x->coaddr == NULL)
800 goto error;
801 }
802
803 if (attrs[XFRMA_SA_EXTRA_FLAGS])
804 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
805
806 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))
807 goto error;
808 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
809 attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
810 goto error;
811 if (!x->props.aalgo) {
812 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
813 attrs[XFRMA_ALG_AUTH], extack)))
814 goto error;
815 }
816 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
817 goto error;
818 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
819 xfrm_calg_get_byname,
820 attrs[XFRMA_ALG_COMP], extack)))
821 goto error;
822
823 if (attrs[XFRMA_TFCPAD])
824 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
825
826 xfrm_mark_get(attrs, &x->mark);
827
828 xfrm_smark_init(attrs, &x->props.smark);
829
830 if (attrs[XFRMA_IF_ID])
831 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
832
833 if (attrs[XFRMA_SA_DIR])
834 x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
835
836 if (attrs[XFRMA_NAT_KEEPALIVE_INTERVAL])
837 x->nat_keepalive_interval =
838 nla_get_u32(attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]);
839
840 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack);
841 if (err)
842 goto error;
843
844 if (attrs[XFRMA_SEC_CTX]) {
845 err = security_xfrm_state_alloc(x,
846 nla_data(attrs[XFRMA_SEC_CTX]));
847 if (err)
848 goto error;
849 }
850
851 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
852 attrs[XFRMA_REPLAY_ESN_VAL])))
853 goto error;
854
855 x->km.seq = p->seq;
856 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
857 /* sysctl_xfrm_aevent_etime is in 100ms units */
858 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
859
860 if ((err = xfrm_init_replay(x, extack)))
861 goto error;
862
863 /* override default values from above */
864 xfrm_update_ae_params(x, attrs, 0);
865
866 /* configure the hardware if offload is requested */
867 if (attrs[XFRMA_OFFLOAD_DEV]) {
868 err = xfrm_dev_state_add(net, x,
869 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
870 extack);
871 if (err)
872 goto error;
873 }
874
875 return x;
876
877 error:
878 x->km.state = XFRM_STATE_DEAD;
879 xfrm_state_put(x);
880 error_no_put:
881 *errp = err;
882 return NULL;
883 }
884
885 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
886 struct nlattr **attrs, struct netlink_ext_ack *extack)
887 {
888 struct net *net = sock_net(skb->sk);
889 struct xfrm_usersa_info *p = nlmsg_data(nlh);
890 struct xfrm_state *x;
891 int err;
892 struct km_event c;
893
894 err = verify_newsa_info(p, attrs, extack);
895 if (err)
896 return err;
897
898 x = xfrm_state_construct(net, p, attrs, &err, extack);
899 if (!x)
900 return err;
901
902 xfrm_state_hold(x);
903 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
904 err = xfrm_state_add(x);
905 else
906 err = xfrm_state_update(x);
907
908 xfrm_audit_state_add(x, err ? 0 : 1, true);
909
910 if (err < 0) {
911 x->km.state = XFRM_STATE_DEAD;
912 xfrm_dev_state_delete(x);
913 __xfrm_state_put(x);
914 goto out;
915 }
916
917 if (x->km.state == XFRM_STATE_VOID)
918 x->km.state = XFRM_STATE_VALID;
919
920 c.seq = nlh->nlmsg_seq;
921 c.portid = nlh->nlmsg_pid;
922 c.event = nlh->nlmsg_type;
923
924 km_state_notify(x, &c);
925 out:
926 xfrm_state_put(x);
927 return err;
928 }
929
930 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
931 struct xfrm_usersa_id *p,
932 struct nlattr **attrs,
933 int *errp)
934 {
935 struct xfrm_state *x = NULL;
936 struct xfrm_mark m;
937 int err;
938 u32 mark = xfrm_mark_get(attrs, &m);
939
940 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
941 err = -ESRCH;
942 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
943 } else {
944 xfrm_address_t *saddr = NULL;
945
946 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
947 if (!saddr) {
948 err = -EINVAL;
949 goto out;
950 }
951
952 err = -ESRCH;
953 x = xfrm_state_lookup_byaddr(net, mark,
954 &p->daddr, saddr,
955 p->proto, p->family);
956 }
957
958 out:
959 if (!x && errp)
960 *errp = err;
961 return x;
962 }
963
964 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
965 struct nlattr **attrs, struct netlink_ext_ack *extack)
966 {
967 struct net *net = sock_net(skb->sk);
968 struct xfrm_state *x;
969 int err = -ESRCH;
970 struct km_event c;
971 struct xfrm_usersa_id *p = nlmsg_data(nlh);
972
973 x = xfrm_user_state_lookup(net, p, attrs, &err);
974 if (x == NULL)
975 return err;
976
977 if ((err = security_xfrm_state_delete(x)) != 0)
978 goto out;
979
980 if (xfrm_state_kern(x)) {
981 NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
982 err = -EPERM;
983 goto out;
984 }
985
986 err = xfrm_state_delete(x);
987 if (err < 0)
988 goto out;
989
990 c.seq = nlh->nlmsg_seq;
991 c.portid = nlh->nlmsg_pid;
992 c.event = nlh->nlmsg_type;
993 km_state_notify(x, &c);
994
995 out:
996 xfrm_audit_state_delete(x, err ? 0 : 1, true);
997 xfrm_state_put(x);
998 return err;
999 }
1000
1001 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
1002 {
1003 memset(p, 0, sizeof(*p));
1004 memcpy(&p->id, &x->id, sizeof(p->id));
1005 memcpy(&p->sel, &x->sel, sizeof(p->sel));
1006 memcpy(&p->lft, &x->lft, sizeof(p->lft));
1007 if (x->xso.dev)
1008 xfrm_dev_state_update_stats(x);
1009 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
1010 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
1011 put_unaligned(x->stats.replay, &p->stats.replay);
1012 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
1013 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1014 p->mode = x->props.mode;
1015 p->replay_window = x->props.replay_window;
1016 p->reqid = x->props.reqid;
1017 p->family = x->props.family;
1018 p->flags = x->props.flags;
1019 p->seq = x->km.seq;
1020 }
1021
1022 struct xfrm_dump_info {
1023 struct sk_buff *in_skb;
1024 struct sk_buff *out_skb;
1025 u32 nlmsg_seq;
1026 u16 nlmsg_flags;
1027 };
1028
1029 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1030 {
1031 struct xfrm_user_sec_ctx *uctx;
1032 struct nlattr *attr;
1033 int ctx_size = sizeof(*uctx) + s->ctx_len;
1034
1035 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
1036 if (attr == NULL)
1037 return -EMSGSIZE;
1038
1039 uctx = nla_data(attr);
1040 uctx->exttype = XFRMA_SEC_CTX;
1041 uctx->len = ctx_size;
1042 uctx->ctx_doi = s->ctx_doi;
1043 uctx->ctx_alg = s->ctx_alg;
1044 uctx->ctx_len = s->ctx_len;
1045 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1046
1047 return 0;
1048 }
1049
1050 static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
1051 {
1052 struct xfrm_user_offload *xuo;
1053 struct nlattr *attr;
1054
1055 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
1056 if (attr == NULL)
1057 return -EMSGSIZE;
1058
1059 xuo = nla_data(attr);
1060 memset(xuo, 0, sizeof(*xuo));
1061 xuo->ifindex = xso->dev->ifindex;
1062 if (xso->dir == XFRM_DEV_OFFLOAD_IN)
1063 xuo->flags = XFRM_OFFLOAD_INBOUND;
1064 if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
1065 xuo->flags |= XFRM_OFFLOAD_PACKET;
1066
1067 return 0;
1068 }
1069
1070 static bool xfrm_redact(void)
1071 {
1072 return IS_ENABLED(CONFIG_SECURITY) &&
1073 security_locked_down(LOCKDOWN_XFRM_SECRET);
1074 }
1075
1076 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
1077 {
1078 struct xfrm_algo *algo;
1079 struct xfrm_algo_auth *ap;
1080 struct nlattr *nla;
1081 bool redact_secret = xfrm_redact();
1082
1083 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
1084 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
1085 if (!nla)
1086 return -EMSGSIZE;
1087 algo = nla_data(nla);
1088 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
1089
1090 if (redact_secret && auth->alg_key_len)
1091 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
1092 else
1093 memcpy(algo->alg_key, auth->alg_key,
1094 (auth->alg_key_len + 7) / 8);
1095 algo->alg_key_len = auth->alg_key_len;
1096
1097 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
1098 if (!nla)
1099 return -EMSGSIZE;
1100 ap = nla_data(nla);
1101 memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
1102 if (redact_secret && auth->alg_key_len)
1103 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
1104 else
1105 memcpy(ap->alg_key, auth->alg_key,
1106 (auth->alg_key_len + 7) / 8);
1107 return 0;
1108 }
1109
1110 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
1111 {
1112 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
1113 struct xfrm_algo_aead *ap;
1114 bool redact_secret = xfrm_redact();
1115
1116 if (!nla)
1117 return -EMSGSIZE;
1118
1119 ap = nla_data(nla);
1120 strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name));
1121 ap->alg_key_len = aead->alg_key_len;
1122 ap->alg_icv_len = aead->alg_icv_len;
1123
1124 if (redact_secret && aead->alg_key_len)
1125 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
1126 else
1127 memcpy(ap->alg_key, aead->alg_key,
1128 (aead->alg_key_len + 7) / 8);
1129 return 0;
1130 }
1131
1132 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
1133 {
1134 struct xfrm_algo *ap;
1135 bool redact_secret = xfrm_redact();
1136 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
1137 xfrm_alg_len(ealg));
1138 if (!nla)
1139 return -EMSGSIZE;
1140
1141 ap = nla_data(nla);
1142 strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name));
1143 ap->alg_key_len = ealg->alg_key_len;
1144
1145 if (redact_secret && ealg->alg_key_len)
1146 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
1147 else
1148 memcpy(ap->alg_key, ealg->alg_key,
1149 (ealg->alg_key_len + 7) / 8);
1150
1151 return 0;
1152 }
1153
1154 static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
1155 {
1156 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
1157 struct xfrm_algo *ap;
1158
1159 if (!nla)
1160 return -EMSGSIZE;
1161
1162 ap = nla_data(nla);
1163 strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name));
1164 ap->alg_key_len = 0;
1165
1166 return 0;
1167 }
1168
1169 static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
1170 {
1171 struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
1172 struct xfrm_encap_tmpl *uep;
1173
1174 if (!nla)
1175 return -EMSGSIZE;
1176
1177 uep = nla_data(nla);
1178 memset(uep, 0, sizeof(*uep));
1179
1180 uep->encap_type = ep->encap_type;
1181 uep->encap_sport = ep->encap_sport;
1182 uep->encap_dport = ep->encap_dport;
1183 uep->encap_oa = ep->encap_oa;
1184
1185 return 0;
1186 }
1187
1188 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
1189 {
1190 int ret = 0;
1191
1192 if (m->v | m->m) {
1193 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
1194 if (!ret)
1195 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
1196 }
1197 return ret;
1198 }
1199
1200 /* Don't change this without updating xfrm_sa_len! */
1201 static int copy_to_user_state_extra(struct xfrm_state *x,
1202 struct xfrm_usersa_info *p,
1203 struct sk_buff *skb)
1204 {
1205 int ret = 0;
1206
1207 copy_to_user_state(x, p);
1208
1209 if (x->props.extra_flags) {
1210 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
1211 x->props.extra_flags);
1212 if (ret)
1213 goto out;
1214 }
1215
1216 if (x->coaddr) {
1217 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
1218 if (ret)
1219 goto out;
1220 }
1221 if (x->lastused) {
1222 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
1223 XFRMA_PAD);
1224 if (ret)
1225 goto out;
1226 }
1227 if (x->aead) {
1228 ret = copy_to_user_aead(x->aead, skb);
1229 if (ret)
1230 goto out;
1231 }
1232 if (x->aalg) {
1233 ret = copy_to_user_auth(x->aalg, skb);
1234 if (ret)
1235 goto out;
1236 }
1237 if (x->ealg) {
1238 ret = copy_to_user_ealg(x->ealg, skb);
1239 if (ret)
1240 goto out;
1241 }
1242 if (x->calg) {
1243 ret = copy_to_user_calg(x->calg, skb);
1244 if (ret)
1245 goto out;
1246 }
1247 if (x->encap) {
1248 ret = copy_to_user_encap(x->encap, skb);
1249 if (ret)
1250 goto out;
1251 }
1252 if (x->tfcpad) {
1253 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1254 if (ret)
1255 goto out;
1256 }
1257 ret = xfrm_mark_put(skb, &x->mark);
1258 if (ret)
1259 goto out;
1260
1261 ret = xfrm_smark_put(skb, &x->props.smark);
1262 if (ret)
1263 goto out;
1264
1265 if (x->replay_esn)
1266 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1267 xfrm_replay_state_esn_len(x->replay_esn),
1268 x->replay_esn);
1269 else
1270 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1271 &x->replay);
1272 if (ret)
1273 goto out;
1274 if(x->xso.dev)
1275 ret = copy_user_offload(&x->xso, skb);
1276 if (ret)
1277 goto out;
1278 if (x->if_id) {
1279 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1280 if (ret)
1281 goto out;
1282 }
1283 if (x->security) {
1284 ret = copy_sec_ctx(x->security, skb);
1285 if (ret)
1286 goto out;
1287 }
1288 if (x->mapping_maxage) {
1289 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1290 if (ret)
1291 goto out;
1292 }
1293 if (x->dir)
1294 ret = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
1295
1296 if (x->nat_keepalive_interval) {
1297 ret = nla_put_u32(skb, XFRMA_NAT_KEEPALIVE_INTERVAL,
1298 x->nat_keepalive_interval);
1299 if (ret)
1300 goto out;
1301 }
1302 out:
1303 return ret;
1304 }
1305
1306 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1307 {
1308 struct xfrm_dump_info *sp = ptr;
1309 struct sk_buff *in_skb = sp->in_skb;
1310 struct sk_buff *skb = sp->out_skb;
1311 struct xfrm_translator *xtr;
1312 struct xfrm_usersa_info *p;
1313 struct nlmsghdr *nlh;
1314 int err;
1315
1316 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1317 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1318 if (nlh == NULL)
1319 return -EMSGSIZE;
1320
1321 p = nlmsg_data(nlh);
1322
1323 err = copy_to_user_state_extra(x, p, skb);
1324 if (err) {
1325 nlmsg_cancel(skb, nlh);
1326 return err;
1327 }
1328 nlmsg_end(skb, nlh);
1329
1330 xtr = xfrm_get_translator();
1331 if (xtr) {
1332 err = xtr->alloc_compat(skb, nlh);
1333
1334 xfrm_put_translator(xtr);
1335 if (err) {
1336 nlmsg_cancel(skb, nlh);
1337 return err;
1338 }
1339 }
1340
1341 return 0;
1342 }
1343
1344 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1345 {
1346 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1347 struct sock *sk = cb->skb->sk;
1348 struct net *net = sock_net(sk);
1349
1350 if (cb->args[0])
1351 xfrm_state_walk_done(walk, net);
1352 return 0;
1353 }
1354
1355 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1356 {
1357 struct net *net = sock_net(skb->sk);
1358 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1359 struct xfrm_dump_info info;
1360
1361 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1362 sizeof(cb->args) - sizeof(cb->args[0]));
1363
1364 info.in_skb = cb->skb;
1365 info.out_skb = skb;
1366 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1367 info.nlmsg_flags = NLM_F_MULTI;
1368
1369 if (!cb->args[0]) {
1370 struct nlattr *attrs[XFRMA_MAX+1];
1371 struct xfrm_address_filter *filter = NULL;
1372 u8 proto = 0;
1373 int err;
1374
1375 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1376 xfrma_policy, cb->extack);
1377 if (err < 0)
1378 return err;
1379
1380 if (attrs[XFRMA_ADDRESS_FILTER]) {
1381 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1382 sizeof(*filter), GFP_KERNEL);
1383 if (filter == NULL)
1384 return -ENOMEM;
1385
1386 /* see addr_match(), (prefix length >> 5) << 2
1387 * will be used to compare xfrm_address_t
1388 */
1389 if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1390 filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1391 kfree(filter);
1392 return -EINVAL;
1393 }
1394 }
1395
1396 if (attrs[XFRMA_PROTO])
1397 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1398
1399 xfrm_state_walk_init(walk, proto, filter);
1400 cb->args[0] = 1;
1401 }
1402
1403 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1404
1405 return skb->len;
1406 }
1407
1408 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1409 struct xfrm_state *x, u32 seq)
1410 {
1411 struct xfrm_dump_info info;
1412 struct sk_buff *skb;
1413 int err;
1414
1415 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1416 if (!skb)
1417 return ERR_PTR(-ENOMEM);
1418
1419 info.in_skb = in_skb;
1420 info.out_skb = skb;
1421 info.nlmsg_seq = seq;
1422 info.nlmsg_flags = 0;
1423
1424 err = dump_one_state(x, 0, &info);
1425 if (err) {
1426 kfree_skb(skb);
1427 return ERR_PTR(err);
1428 }
1429
1430 return skb;
1431 }
1432
1433 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1434 * Must be called with RCU read lock.
1435 */
1436 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1437 u32 pid, unsigned int group)
1438 {
1439 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1440 struct xfrm_translator *xtr;
1441
1442 if (!nlsk) {
1443 kfree_skb(skb);
1444 return -EPIPE;
1445 }
1446
1447 xtr = xfrm_get_translator();
1448 if (xtr) {
1449 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1450
1451 xfrm_put_translator(xtr);
1452 if (err) {
1453 kfree_skb(skb);
1454 return err;
1455 }
1456 }
1457
1458 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1459 }
1460
1461 static inline unsigned int xfrm_spdinfo_msgsize(void)
1462 {
1463 return NLMSG_ALIGN(4)
1464 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1465 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1466 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1467 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1468 }
1469
1470 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1471 u32 portid, u32 seq, u32 flags)
1472 {
1473 struct xfrmk_spdinfo si;
1474 struct xfrmu_spdinfo spc;
1475 struct xfrmu_spdhinfo sph;
1476 struct xfrmu_spdhthresh spt4, spt6;
1477 struct nlmsghdr *nlh;
1478 int err;
1479 u32 *f;
1480 unsigned lseq;
1481
1482 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1483 if (nlh == NULL) /* shouldn't really happen ... */
1484 return -EMSGSIZE;
1485
1486 f = nlmsg_data(nlh);
1487 *f = flags;
1488 xfrm_spd_getinfo(net, &si);
1489 spc.incnt = si.incnt;
1490 spc.outcnt = si.outcnt;
1491 spc.fwdcnt = si.fwdcnt;
1492 spc.inscnt = si.inscnt;
1493 spc.outscnt = si.outscnt;
1494 spc.fwdscnt = si.fwdscnt;
1495 sph.spdhcnt = si.spdhcnt;
1496 sph.spdhmcnt = si.spdhmcnt;
1497
1498 do {
1499 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1500
1501 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1502 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1503 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1504 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1505 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1506
1507 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1508 if (!err)
1509 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1510 if (!err)
1511 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1512 if (!err)
1513 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1514 if (err) {
1515 nlmsg_cancel(skb, nlh);
1516 return err;
1517 }
1518
1519 nlmsg_end(skb, nlh);
1520 return 0;
1521 }
1522
1523 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1524 struct nlattr **attrs,
1525 struct netlink_ext_ack *extack)
1526 {
1527 struct net *net = sock_net(skb->sk);
1528 struct xfrmu_spdhthresh *thresh4 = NULL;
1529 struct xfrmu_spdhthresh *thresh6 = NULL;
1530
1531 /* selector prefixlen thresholds to hash policies */
1532 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1533 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1534
1535 if (nla_len(rta) < sizeof(*thresh4)) {
1536 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
1537 return -EINVAL;
1538 }
1539 thresh4 = nla_data(rta);
1540 if (thresh4->lbits > 32 || thresh4->rbits > 32) {
1541 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
1542 return -EINVAL;
1543 }
1544 }
1545 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1546 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1547
1548 if (nla_len(rta) < sizeof(*thresh6)) {
1549 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
1550 return -EINVAL;
1551 }
1552 thresh6 = nla_data(rta);
1553 if (thresh6->lbits > 128 || thresh6->rbits > 128) {
1554 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
1555 return -EINVAL;
1556 }
1557 }
1558
1559 if (thresh4 || thresh6) {
1560 write_seqlock(&net->xfrm.policy_hthresh.lock);
1561 if (thresh4) {
1562 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1563 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1564 }
1565 if (thresh6) {
1566 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1567 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1568 }
1569 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1570
1571 xfrm_policy_hash_rebuild(net);
1572 }
1573
1574 return 0;
1575 }
1576
1577 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1578 struct nlattr **attrs,
1579 struct netlink_ext_ack *extack)
1580 {
1581 struct net *net = sock_net(skb->sk);
1582 struct sk_buff *r_skb;
1583 u32 *flags = nlmsg_data(nlh);
1584 u32 sportid = NETLINK_CB(skb).portid;
1585 u32 seq = nlh->nlmsg_seq;
1586 int err;
1587
1588 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1589 if (r_skb == NULL)
1590 return -ENOMEM;
1591
1592 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1593 BUG_ON(err < 0);
1594
1595 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1596 }
1597
1598 static inline unsigned int xfrm_sadinfo_msgsize(void)
1599 {
1600 return NLMSG_ALIGN(4)
1601 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1602 + nla_total_size(4); /* XFRMA_SAD_CNT */
1603 }
1604
1605 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1606 u32 portid, u32 seq, u32 flags)
1607 {
1608 struct xfrmk_sadinfo si;
1609 struct xfrmu_sadhinfo sh;
1610 struct nlmsghdr *nlh;
1611 int err;
1612 u32 *f;
1613
1614 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1615 if (nlh == NULL) /* shouldn't really happen ... */
1616 return -EMSGSIZE;
1617
1618 f = nlmsg_data(nlh);
1619 *f = flags;
1620 xfrm_sad_getinfo(net, &si);
1621
1622 sh.sadhmcnt = si.sadhmcnt;
1623 sh.sadhcnt = si.sadhcnt;
1624
1625 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1626 if (!err)
1627 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1628 if (err) {
1629 nlmsg_cancel(skb, nlh);
1630 return err;
1631 }
1632
1633 nlmsg_end(skb, nlh);
1634 return 0;
1635 }
1636
1637 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1638 struct nlattr **attrs,
1639 struct netlink_ext_ack *extack)
1640 {
1641 struct net *net = sock_net(skb->sk);
1642 struct sk_buff *r_skb;
1643 u32 *flags = nlmsg_data(nlh);
1644 u32 sportid = NETLINK_CB(skb).portid;
1645 u32 seq = nlh->nlmsg_seq;
1646 int err;
1647
1648 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1649 if (r_skb == NULL)
1650 return -ENOMEM;
1651
1652 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1653 BUG_ON(err < 0);
1654
1655 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1656 }
1657
1658 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1659 struct nlattr **attrs, struct netlink_ext_ack *extack)
1660 {
1661 struct net *net = sock_net(skb->sk);
1662 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1663 struct xfrm_state *x;
1664 struct sk_buff *resp_skb;
1665 int err = -ESRCH;
1666
1667 x = xfrm_user_state_lookup(net, p, attrs, &err);
1668 if (x == NULL)
1669 goto out_noput;
1670
1671 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1672 if (IS_ERR(resp_skb)) {
1673 err = PTR_ERR(resp_skb);
1674 } else {
1675 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1676 }
1677 xfrm_state_put(x);
1678 out_noput:
1679 return err;
1680 }
1681
1682 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1683 struct nlattr **attrs,
1684 struct netlink_ext_ack *extack)
1685 {
1686 struct net *net = sock_net(skb->sk);
1687 struct xfrm_state *x;
1688 struct xfrm_userspi_info *p;
1689 struct xfrm_translator *xtr;
1690 struct sk_buff *resp_skb;
1691 xfrm_address_t *daddr;
1692 int family;
1693 int err;
1694 u32 mark;
1695 struct xfrm_mark m;
1696 u32 if_id = 0;
1697
1698 p = nlmsg_data(nlh);
1699 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
1700 if (err)
1701 goto out_noput;
1702
1703 family = p->info.family;
1704 daddr = &p->info.id.daddr;
1705
1706 x = NULL;
1707
1708 mark = xfrm_mark_get(attrs, &m);
1709
1710 if (attrs[XFRMA_IF_ID])
1711 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1712
1713 if (p->info.seq) {
1714 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1715 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1716 xfrm_state_put(x);
1717 x = NULL;
1718 }
1719 }
1720
1721 if (!x)
1722 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1723 if_id, p->info.id.proto, daddr,
1724 &p->info.saddr, 1,
1725 family);
1726 err = -ENOENT;
1727 if (!x) {
1728 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
1729 goto out_noput;
1730 }
1731
1732 err = xfrm_alloc_spi(x, p->min, p->max, extack);
1733 if (err)
1734 goto out;
1735
1736 if (attrs[XFRMA_SA_DIR])
1737 x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
1738
1739 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1740 if (IS_ERR(resp_skb)) {
1741 err = PTR_ERR(resp_skb);
1742 goto out;
1743 }
1744
1745 xtr = xfrm_get_translator();
1746 if (xtr) {
1747 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1748
1749 xfrm_put_translator(xtr);
1750 if (err) {
1751 kfree_skb(resp_skb);
1752 goto out;
1753 }
1754 }
1755
1756 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1757
1758 out:
1759 xfrm_state_put(x);
1760 out_noput:
1761 return err;
1762 }
1763
1764 static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
1765 {
1766 switch (dir) {
1767 case XFRM_POLICY_IN:
1768 case XFRM_POLICY_OUT:
1769 case XFRM_POLICY_FWD:
1770 break;
1771
1772 default:
1773 NL_SET_ERR_MSG(extack, "Invalid policy direction");
1774 return -EINVAL;
1775 }
1776
1777 return 0;
1778 }
1779
1780 static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
1781 {
1782 switch (type) {
1783 case XFRM_POLICY_TYPE_MAIN:
1784 #ifdef CONFIG_XFRM_SUB_POLICY
1785 case XFRM_POLICY_TYPE_SUB:
1786 #endif
1787 break;
1788
1789 default:
1790 NL_SET_ERR_MSG(extack, "Invalid policy type");
1791 return -EINVAL;
1792 }
1793
1794 return 0;
1795 }
1796
1797 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
1798 struct netlink_ext_ack *extack)
1799 {
1800 int ret;
1801
1802 switch (p->share) {
1803 case XFRM_SHARE_ANY:
1804 case XFRM_SHARE_SESSION:
1805 case XFRM_SHARE_USER:
1806 case XFRM_SHARE_UNIQUE:
1807 break;
1808
1809 default:
1810 NL_SET_ERR_MSG(extack, "Invalid policy share");
1811 return -EINVAL;
1812 }
1813
1814 switch (p->action) {
1815 case XFRM_POLICY_ALLOW:
1816 case XFRM_POLICY_BLOCK:
1817 break;
1818
1819 default:
1820 NL_SET_ERR_MSG(extack, "Invalid policy action");
1821 return -EINVAL;
1822 }
1823
1824 switch (p->sel.family) {
1825 case AF_INET:
1826 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
1827 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
1828 return -EINVAL;
1829 }
1830
1831 break;
1832
1833 case AF_INET6:
1834 #if IS_ENABLED(CONFIG_IPV6)
1835 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
1836 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
1837 return -EINVAL;
1838 }
1839
1840 break;
1841 #else
1842 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
1843 return -EAFNOSUPPORT;
1844 #endif
1845
1846 default:
1847 NL_SET_ERR_MSG(extack, "Invalid selector family");
1848 return -EINVAL;
1849 }
1850
1851 ret = verify_policy_dir(p->dir, extack);
1852 if (ret)
1853 return ret;
1854 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
1855 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
1856 return -EINVAL;
1857 }
1858
1859 return 0;
1860 }
1861
1862 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1863 {
1864 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1865 struct xfrm_user_sec_ctx *uctx;
1866
1867 if (!rt)
1868 return 0;
1869
1870 uctx = nla_data(rt);
1871 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1872 }
1873
1874 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1875 int nr)
1876 {
1877 int i;
1878
1879 xp->xfrm_nr = nr;
1880 for (i = 0; i < nr; i++, ut++) {
1881 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1882
1883 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1884 memcpy(&t->saddr, &ut->saddr,
1885 sizeof(xfrm_address_t));
1886 t->reqid = ut->reqid;
1887 t->mode = ut->mode;
1888 t->share = ut->share;
1889 t->optional = ut->optional;
1890 t->aalgos = ut->aalgos;
1891 t->ealgos = ut->ealgos;
1892 t->calgos = ut->calgos;
1893 /* If all masks are ~0, then we allow all algorithms. */
1894 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1895 t->encap_family = ut->family;
1896 }
1897 }
1898
1899 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,
1900 int dir, struct netlink_ext_ack *extack)
1901 {
1902 u16 prev_family;
1903 int i;
1904
1905 if (nr > XFRM_MAX_DEPTH) {
1906 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
1907 return -EINVAL;
1908 }
1909
1910 prev_family = family;
1911
1912 for (i = 0; i < nr; i++) {
1913 /* We never validated the ut->family value, so many
1914 * applications simply leave it at zero. The check was
1915 * never made and ut->family was ignored because all
1916 * templates could be assumed to have the same family as
1917 * the policy itself. Now that we will have ipv4-in-ipv6
1918 * and ipv6-in-ipv4 tunnels, this is no longer true.
1919 */
1920 if (!ut[i].family)
1921 ut[i].family = family;
1922
1923 switch (ut[i].mode) {
1924 case XFRM_MODE_TUNNEL:
1925 case XFRM_MODE_BEET:
1926 if (ut[i].optional && dir == XFRM_POLICY_OUT) {
1927 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
1928 return -EINVAL;
1929 }
1930 break;
1931 default:
1932 if (ut[i].family != prev_family) {
1933 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
1934 return -EINVAL;
1935 }
1936 break;
1937 }
1938 if (ut[i].mode >= XFRM_MODE_MAX) {
1939 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
1940 return -EINVAL;
1941 }
1942
1943 prev_family = ut[i].family;
1944
1945 switch (ut[i].family) {
1946 case AF_INET:
1947 break;
1948 #if IS_ENABLED(CONFIG_IPV6)
1949 case AF_INET6:
1950 break;
1951 #endif
1952 default:
1953 NL_SET_ERR_MSG(extack, "Invalid family in template");
1954 return -EINVAL;
1955 }
1956
1957 if (!xfrm_id_proto_valid(ut[i].id.proto)) {
1958 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
1959 return -EINVAL;
1960 }
1961 }
1962
1963 return 0;
1964 }
1965
1966 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
1967 int dir, struct netlink_ext_ack *extack)
1968 {
1969 struct nlattr *rt = attrs[XFRMA_TMPL];
1970
1971 if (!rt) {
1972 pol->xfrm_nr = 0;
1973 } else {
1974 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1975 int nr = nla_len(rt) / sizeof(*utmpl);
1976 int err;
1977
1978 err = validate_tmpl(nr, utmpl, pol->family, dir, extack);
1979 if (err)
1980 return err;
1981
1982 copy_templates(pol, utmpl, nr);
1983 }
1984 return 0;
1985 }
1986
1987 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
1988 struct netlink_ext_ack *extack)
1989 {
1990 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1991 struct xfrm_userpolicy_type *upt;
1992 u8 type = XFRM_POLICY_TYPE_MAIN;
1993 int err;
1994
1995 if (rt) {
1996 upt = nla_data(rt);
1997 type = upt->type;
1998 }
1999
2000 err = verify_policy_type(type, extack);
2001 if (err)
2002 return err;
2003
2004 *tp = type;
2005 return 0;
2006 }
2007
2008 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
2009 {
2010 xp->priority = p->priority;
2011 xp->index = p->index;
2012 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
2013 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
2014 xp->action = p->action;
2015 xp->flags = p->flags;
2016 xp->family = p->sel.family;
2017 /* XXX xp->share = p->share; */
2018 }
2019
2020 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
2021 {
2022 memset(p, 0, sizeof(*p));
2023 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
2024 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
2025 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
2026 p->priority = xp->priority;
2027 p->index = xp->index;
2028 p->sel.family = xp->family;
2029 p->dir = dir;
2030 p->action = xp->action;
2031 p->flags = xp->flags;
2032 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
2033 }
2034
2035 static struct xfrm_policy *xfrm_policy_construct(struct net *net,
2036 struct xfrm_userpolicy_info *p,
2037 struct nlattr **attrs,
2038 int *errp,
2039 struct netlink_ext_ack *extack)
2040 {
2041 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
2042 int err;
2043
2044 if (!xp) {
2045 *errp = -ENOMEM;
2046 return NULL;
2047 }
2048
2049 copy_from_user_policy(xp, p);
2050
2051 err = copy_from_user_policy_type(&xp->type, attrs, extack);
2052 if (err)
2053 goto error;
2054
2055 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
2056 err = copy_from_user_sec_ctx(xp, attrs);
2057 if (err)
2058 goto error;
2059
2060 xfrm_mark_get(attrs, &xp->mark);
2061
2062 if (attrs[XFRMA_IF_ID])
2063 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2064
2065 /* configure the hardware if offload is requested */
2066 if (attrs[XFRMA_OFFLOAD_DEV]) {
2067 err = xfrm_dev_policy_add(net, xp,
2068 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
2069 p->dir, extack);
2070 if (err)
2071 goto error;
2072 }
2073
2074 return xp;
2075 error:
2076 *errp = err;
2077 xp->walk.dead = 1;
2078 xfrm_policy_destroy(xp);
2079 return NULL;
2080 }
2081
2082 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2083 struct nlattr **attrs,
2084 struct netlink_ext_ack *extack)
2085 {
2086 struct net *net = sock_net(skb->sk);
2087 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
2088 struct xfrm_policy *xp;
2089 struct km_event c;
2090 int err;
2091 int excl;
2092
2093 err = verify_newpolicy_info(p, extack);
2094 if (err)
2095 return err;
2096 err = verify_sec_ctx_len(attrs, extack);
2097 if (err)
2098 return err;
2099
2100 xp = xfrm_policy_construct(net, p, attrs, &err, extack);
2101 if (!xp)
2102 return err;
2103
2104 /* shouldn't excl be based on nlh flags??
2105 * Aha! this is anti-netlink really i.e more pfkey derived
2106 * in netlink excl is a flag and you wouldn't need
2107 * a type XFRM_MSG_UPDPOLICY - JHS */
2108 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
2109 err = xfrm_policy_insert(p->dir, xp, excl);
2110 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2111
2112 if (err) {
2113 xfrm_dev_policy_delete(xp);
2114 xfrm_dev_policy_free(xp);
2115 security_xfrm_policy_free(xp->security);
2116 kfree(xp);
2117 return err;
2118 }
2119
2120 c.event = nlh->nlmsg_type;
2121 c.seq = nlh->nlmsg_seq;
2122 c.portid = nlh->nlmsg_pid;
2123 km_policy_notify(xp, p->dir, &c);
2124
2125 xfrm_pol_put(xp);
2126
2127 return 0;
2128 }
2129
2130 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
2131 {
2132 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
2133 int i;
2134
2135 if (xp->xfrm_nr == 0)
2136 return 0;
2137
2138 if (xp->xfrm_nr > XFRM_MAX_DEPTH)
2139 return -ENOBUFS;
2140
2141 for (i = 0; i < xp->xfrm_nr; i++) {
2142 struct xfrm_user_tmpl *up = &vec[i];
2143 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
2144
2145 memset(up, 0, sizeof(*up));
2146 memcpy(&up->id, &kp->id, sizeof(up->id));
2147 up->family = kp->encap_family;
2148 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
2149 up->reqid = kp->reqid;
2150 up->mode = kp->mode;
2151 up->share = kp->share;
2152 up->optional = kp->optional;
2153 up->aalgos = kp->aalgos;
2154 up->ealgos = kp->ealgos;
2155 up->calgos = kp->calgos;
2156 }
2157
2158 return nla_put(skb, XFRMA_TMPL,
2159 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
2160 }
2161
2162 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
2163 {
2164 if (x->security) {
2165 return copy_sec_ctx(x->security, skb);
2166 }
2167 return 0;
2168 }
2169
2170 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
2171 {
2172 if (xp->security)
2173 return copy_sec_ctx(xp->security, skb);
2174 return 0;
2175 }
2176 static inline unsigned int userpolicy_type_attrsize(void)
2177 {
2178 #ifdef CONFIG_XFRM_SUB_POLICY
2179 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
2180 #else
2181 return 0;
2182 #endif
2183 }
2184
2185 #ifdef CONFIG_XFRM_SUB_POLICY
2186 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2187 {
2188 struct xfrm_userpolicy_type upt;
2189
2190 /* Sadly there are two holes in struct xfrm_userpolicy_type */
2191 memset(&upt, 0, sizeof(upt));
2192 upt.type = type;
2193
2194 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2195 }
2196
2197 #else
2198 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2199 {
2200 return 0;
2201 }
2202 #endif
2203
2204 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
2205 {
2206 struct xfrm_dump_info *sp = ptr;
2207 struct xfrm_userpolicy_info *p;
2208 struct sk_buff *in_skb = sp->in_skb;
2209 struct sk_buff *skb = sp->out_skb;
2210 struct xfrm_translator *xtr;
2211 struct nlmsghdr *nlh;
2212 int err;
2213
2214 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
2215 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
2216 if (nlh == NULL)
2217 return -EMSGSIZE;
2218
2219 p = nlmsg_data(nlh);
2220 copy_to_user_policy(xp, p, dir);
2221 err = copy_to_user_tmpl(xp, skb);
2222 if (!err)
2223 err = copy_to_user_sec_ctx(xp, skb);
2224 if (!err)
2225 err = copy_to_user_policy_type(xp->type, skb);
2226 if (!err)
2227 err = xfrm_mark_put(skb, &xp->mark);
2228 if (!err)
2229 err = xfrm_if_id_put(skb, xp->if_id);
2230 if (!err && xp->xdo.dev)
2231 err = copy_user_offload(&xp->xdo, skb);
2232 if (err) {
2233 nlmsg_cancel(skb, nlh);
2234 return err;
2235 }
2236 nlmsg_end(skb, nlh);
2237
2238 xtr = xfrm_get_translator();
2239 if (xtr) {
2240 err = xtr->alloc_compat(skb, nlh);
2241
2242 xfrm_put_translator(xtr);
2243 if (err) {
2244 nlmsg_cancel(skb, nlh);
2245 return err;
2246 }
2247 }
2248
2249 return 0;
2250 }
2251
2252 static int xfrm_dump_policy_done(struct netlink_callback *cb)
2253 {
2254 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2255 struct net *net = sock_net(cb->skb->sk);
2256
2257 xfrm_policy_walk_done(walk, net);
2258 return 0;
2259 }
2260
2261 static int xfrm_dump_policy_start(struct netlink_callback *cb)
2262 {
2263 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2264
2265 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
2266
2267 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
2268 return 0;
2269 }
2270
2271 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
2272 {
2273 struct net *net = sock_net(skb->sk);
2274 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2275 struct xfrm_dump_info info;
2276
2277 info.in_skb = cb->skb;
2278 info.out_skb = skb;
2279 info.nlmsg_seq = cb->nlh->nlmsg_seq;
2280 info.nlmsg_flags = NLM_F_MULTI;
2281
2282 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
2283
2284 return skb->len;
2285 }
2286
2287 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
2288 struct xfrm_policy *xp,
2289 int dir, u32 seq)
2290 {
2291 struct xfrm_dump_info info;
2292 struct sk_buff *skb;
2293 int err;
2294
2295 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2296 if (!skb)
2297 return ERR_PTR(-ENOMEM);
2298
2299 info.in_skb = in_skb;
2300 info.out_skb = skb;
2301 info.nlmsg_seq = seq;
2302 info.nlmsg_flags = 0;
2303
2304 err = dump_one_policy(xp, dir, 0, &info);
2305 if (err) {
2306 kfree_skb(skb);
2307 return ERR_PTR(err);
2308 }
2309
2310 return skb;
2311 }
2312
2313 static int xfrm_notify_userpolicy(struct net *net)
2314 {
2315 struct xfrm_userpolicy_default *up;
2316 int len = NLMSG_ALIGN(sizeof(*up));
2317 struct nlmsghdr *nlh;
2318 struct sk_buff *skb;
2319 int err;
2320
2321 skb = nlmsg_new(len, GFP_ATOMIC);
2322 if (skb == NULL)
2323 return -ENOMEM;
2324
2325 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
2326 if (nlh == NULL) {
2327 kfree_skb(skb);
2328 return -EMSGSIZE;
2329 }
2330
2331 up = nlmsg_data(nlh);
2332 up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2333 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2334 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2335
2336 nlmsg_end(skb, nlh);
2337
2338 rcu_read_lock();
2339 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2340 rcu_read_unlock();
2341
2342 return err;
2343 }
2344
2345 static bool xfrm_userpolicy_is_valid(__u8 policy)
2346 {
2347 return policy == XFRM_USERPOLICY_BLOCK ||
2348 policy == XFRM_USERPOLICY_ACCEPT;
2349 }
2350
2351 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2352 struct nlattr **attrs, struct netlink_ext_ack *extack)
2353 {
2354 struct net *net = sock_net(skb->sk);
2355 struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2356
2357 if (xfrm_userpolicy_is_valid(up->in))
2358 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2359
2360 if (xfrm_userpolicy_is_valid(up->fwd))
2361 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2362
2363 if (xfrm_userpolicy_is_valid(up->out))
2364 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2365
2366 rt_genid_bump_all(net);
2367
2368 xfrm_notify_userpolicy(net);
2369 return 0;
2370 }
2371
2372 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2373 struct nlattr **attrs, struct netlink_ext_ack *extack)
2374 {
2375 struct sk_buff *r_skb;
2376 struct nlmsghdr *r_nlh;
2377 struct net *net = sock_net(skb->sk);
2378 struct xfrm_userpolicy_default *r_up;
2379 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2380 u32 portid = NETLINK_CB(skb).portid;
2381 u32 seq = nlh->nlmsg_seq;
2382
2383 r_skb = nlmsg_new(len, GFP_ATOMIC);
2384 if (!r_skb)
2385 return -ENOMEM;
2386
2387 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2388 if (!r_nlh) {
2389 kfree_skb(r_skb);
2390 return -EMSGSIZE;
2391 }
2392
2393 r_up = nlmsg_data(r_nlh);
2394 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2395 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2396 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2397 nlmsg_end(r_skb, r_nlh);
2398
2399 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2400 }
2401
2402 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2403 struct nlattr **attrs,
2404 struct netlink_ext_ack *extack)
2405 {
2406 struct net *net = sock_net(skb->sk);
2407 struct xfrm_policy *xp;
2408 struct xfrm_userpolicy_id *p;
2409 u8 type = XFRM_POLICY_TYPE_MAIN;
2410 int err;
2411 struct km_event c;
2412 int delete;
2413 struct xfrm_mark m;
2414 u32 if_id = 0;
2415
2416 p = nlmsg_data(nlh);
2417 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2418
2419 err = copy_from_user_policy_type(&type, attrs, extack);
2420 if (err)
2421 return err;
2422
2423 err = verify_policy_dir(p->dir, extack);
2424 if (err)
2425 return err;
2426
2427 if (attrs[XFRMA_IF_ID])
2428 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2429
2430 xfrm_mark_get(attrs, &m);
2431
2432 if (p->index)
2433 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2434 p->index, delete, &err);
2435 else {
2436 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2437 struct xfrm_sec_ctx *ctx;
2438
2439 err = verify_sec_ctx_len(attrs, extack);
2440 if (err)
2441 return err;
2442
2443 ctx = NULL;
2444 if (rt) {
2445 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2446
2447 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2448 if (err)
2449 return err;
2450 }
2451 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2452 &p->sel, ctx, delete, &err);
2453 security_xfrm_policy_free(ctx);
2454 }
2455 if (xp == NULL)
2456 return -ENOENT;
2457
2458 if (!delete) {
2459 struct sk_buff *resp_skb;
2460
2461 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2462 if (IS_ERR(resp_skb)) {
2463 err = PTR_ERR(resp_skb);
2464 } else {
2465 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2466 NETLINK_CB(skb).portid);
2467 }
2468 } else {
2469 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2470
2471 if (err != 0)
2472 goto out;
2473
2474 c.data.byid = p->index;
2475 c.event = nlh->nlmsg_type;
2476 c.seq = nlh->nlmsg_seq;
2477 c.portid = nlh->nlmsg_pid;
2478 km_policy_notify(xp, p->dir, &c);
2479 }
2480
2481 out:
2482 xfrm_pol_put(xp);
2483 return err;
2484 }
2485
2486 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2487 struct nlattr **attrs,
2488 struct netlink_ext_ack *extack)
2489 {
2490 struct net *net = sock_net(skb->sk);
2491 struct km_event c;
2492 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2493 int err;
2494
2495 err = xfrm_state_flush(net, p->proto, true, false);
2496 if (err) {
2497 if (err == -ESRCH) /* empty table */
2498 return 0;
2499 return err;
2500 }
2501 c.data.proto = p->proto;
2502 c.event = nlh->nlmsg_type;
2503 c.seq = nlh->nlmsg_seq;
2504 c.portid = nlh->nlmsg_pid;
2505 c.net = net;
2506 km_state_notify(NULL, &c);
2507
2508 return 0;
2509 }
2510
2511 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2512 {
2513 unsigned int replay_size = x->replay_esn ?
2514 xfrm_replay_state_esn_len(x->replay_esn) :
2515 sizeof(struct xfrm_replay_state);
2516
2517 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2518 + nla_total_size(replay_size)
2519 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2520 + nla_total_size(sizeof(struct xfrm_mark))
2521 + nla_total_size(4) /* XFRM_AE_RTHR */
2522 + nla_total_size(4) /* XFRM_AE_ETHR */
2523 + nla_total_size(sizeof(x->dir)); /* XFRMA_SA_DIR */
2524 }
2525
2526 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2527 {
2528 struct xfrm_aevent_id *id;
2529 struct nlmsghdr *nlh;
2530 int err;
2531
2532 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2533 if (nlh == NULL)
2534 return -EMSGSIZE;
2535
2536 id = nlmsg_data(nlh);
2537 memset(&id->sa_id, 0, sizeof(id->sa_id));
2538 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2539 id->sa_id.spi = x->id.spi;
2540 id->sa_id.family = x->props.family;
2541 id->sa_id.proto = x->id.proto;
2542 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2543 id->reqid = x->props.reqid;
2544 id->flags = c->data.aevent;
2545
2546 if (x->replay_esn) {
2547 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2548 xfrm_replay_state_esn_len(x->replay_esn),
2549 x->replay_esn);
2550 } else {
2551 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2552 &x->replay);
2553 }
2554 if (err)
2555 goto out_cancel;
2556 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2557 XFRMA_PAD);
2558 if (err)
2559 goto out_cancel;
2560
2561 if (id->flags & XFRM_AE_RTHR) {
2562 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2563 if (err)
2564 goto out_cancel;
2565 }
2566 if (id->flags & XFRM_AE_ETHR) {
2567 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2568 x->replay_maxage * 10 / HZ);
2569 if (err)
2570 goto out_cancel;
2571 }
2572 err = xfrm_mark_put(skb, &x->mark);
2573 if (err)
2574 goto out_cancel;
2575
2576 err = xfrm_if_id_put(skb, x->if_id);
2577 if (err)
2578 goto out_cancel;
2579
2580 if (x->dir) {
2581 err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
2582 if (err)
2583 goto out_cancel;
2584 }
2585
2586 nlmsg_end(skb, nlh);
2587 return 0;
2588
2589 out_cancel:
2590 nlmsg_cancel(skb, nlh);
2591 return err;
2592 }
2593
2594 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2595 struct nlattr **attrs, struct netlink_ext_ack *extack)
2596 {
2597 struct net *net = sock_net(skb->sk);
2598 struct xfrm_state *x;
2599 struct sk_buff *r_skb;
2600 int err;
2601 struct km_event c;
2602 u32 mark;
2603 struct xfrm_mark m;
2604 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2605 struct xfrm_usersa_id *id = &p->sa_id;
2606
2607 mark = xfrm_mark_get(attrs, &m);
2608
2609 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2610 if (x == NULL)
2611 return -ESRCH;
2612
2613 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2614 if (r_skb == NULL) {
2615 xfrm_state_put(x);
2616 return -ENOMEM;
2617 }
2618
2619 /*
2620 * XXX: is this lock really needed - none of the other
2621 * gets lock (the concern is things getting updated
2622 * while we are still reading) - jhs
2623 */
2624 spin_lock_bh(&x->lock);
2625 c.data.aevent = p->flags;
2626 c.seq = nlh->nlmsg_seq;
2627 c.portid = nlh->nlmsg_pid;
2628
2629 err = build_aevent(r_skb, x, &c);
2630 BUG_ON(err < 0);
2631
2632 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2633 spin_unlock_bh(&x->lock);
2634 xfrm_state_put(x);
2635 return err;
2636 }
2637
2638 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2639 struct nlattr **attrs, struct netlink_ext_ack *extack)
2640 {
2641 struct net *net = sock_net(skb->sk);
2642 struct xfrm_state *x;
2643 struct km_event c;
2644 int err = -EINVAL;
2645 u32 mark = 0;
2646 struct xfrm_mark m;
2647 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2648 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2649 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2650 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2651 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2652 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2653
2654 if (!lt && !rp && !re && !et && !rt) {
2655 NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
2656 return err;
2657 }
2658
2659 /* pedantic mode - thou shalt sayeth replaceth */
2660 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
2661 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
2662 return err;
2663 }
2664
2665 mark = xfrm_mark_get(attrs, &m);
2666
2667 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2668 if (x == NULL)
2669 return -ESRCH;
2670
2671 if (x->km.state != XFRM_STATE_VALID) {
2672 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2673 goto out;
2674 }
2675
2676 err = xfrm_replay_verify_len(x->replay_esn, re, extack);
2677 if (err)
2678 goto out;
2679
2680 spin_lock_bh(&x->lock);
2681 xfrm_update_ae_params(x, attrs, 1);
2682 spin_unlock_bh(&x->lock);
2683
2684 c.event = nlh->nlmsg_type;
2685 c.seq = nlh->nlmsg_seq;
2686 c.portid = nlh->nlmsg_pid;
2687 c.data.aevent = XFRM_AE_CU;
2688 km_state_notify(x, &c);
2689 err = 0;
2690 out:
2691 xfrm_state_put(x);
2692 return err;
2693 }
2694
2695 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2696 struct nlattr **attrs,
2697 struct netlink_ext_ack *extack)
2698 {
2699 struct net *net = sock_net(skb->sk);
2700 struct km_event c;
2701 u8 type = XFRM_POLICY_TYPE_MAIN;
2702 int err;
2703
2704 err = copy_from_user_policy_type(&type, attrs, extack);
2705 if (err)
2706 return err;
2707
2708 err = xfrm_policy_flush(net, type, true);
2709 if (err) {
2710 if (err == -ESRCH) /* empty table */
2711 return 0;
2712 return err;
2713 }
2714
2715 c.data.type = type;
2716 c.event = nlh->nlmsg_type;
2717 c.seq = nlh->nlmsg_seq;
2718 c.portid = nlh->nlmsg_pid;
2719 c.net = net;
2720 km_policy_notify(NULL, 0, &c);
2721 return 0;
2722 }
2723
2724 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2725 struct nlattr **attrs,
2726 struct netlink_ext_ack *extack)
2727 {
2728 struct net *net = sock_net(skb->sk);
2729 struct xfrm_policy *xp;
2730 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2731 struct xfrm_userpolicy_info *p = &up->pol;
2732 u8 type = XFRM_POLICY_TYPE_MAIN;
2733 int err = -ENOENT;
2734 struct xfrm_mark m;
2735 u32 if_id = 0;
2736
2737 err = copy_from_user_policy_type(&type, attrs, extack);
2738 if (err)
2739 return err;
2740
2741 err = verify_policy_dir(p->dir, extack);
2742 if (err)
2743 return err;
2744
2745 if (attrs[XFRMA_IF_ID])
2746 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2747
2748 xfrm_mark_get(attrs, &m);
2749
2750 if (p->index)
2751 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2752 0, &err);
2753 else {
2754 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2755 struct xfrm_sec_ctx *ctx;
2756
2757 err = verify_sec_ctx_len(attrs, extack);
2758 if (err)
2759 return err;
2760
2761 ctx = NULL;
2762 if (rt) {
2763 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2764
2765 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2766 if (err)
2767 return err;
2768 }
2769 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2770 &p->sel, ctx, 0, &err);
2771 security_xfrm_policy_free(ctx);
2772 }
2773 if (xp == NULL)
2774 return -ENOENT;
2775
2776 if (unlikely(xp->walk.dead))
2777 goto out;
2778
2779 err = 0;
2780 if (up->hard) {
2781 xfrm_policy_delete(xp, p->dir);
2782 xfrm_audit_policy_delete(xp, 1, true);
2783 }
2784 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2785
2786 out:
2787 xfrm_pol_put(xp);
2788 return err;
2789 }
2790
2791 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2792 struct nlattr **attrs,
2793 struct netlink_ext_ack *extack)
2794 {
2795 struct net *net = sock_net(skb->sk);
2796 struct xfrm_state *x;
2797 int err;
2798 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2799 struct xfrm_usersa_info *p = &ue->state;
2800 struct xfrm_mark m;
2801 u32 mark = xfrm_mark_get(attrs, &m);
2802
2803 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2804
2805 err = -ENOENT;
2806 if (x == NULL)
2807 return err;
2808
2809 spin_lock_bh(&x->lock);
2810 err = -EINVAL;
2811 if (x->km.state != XFRM_STATE_VALID) {
2812 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2813 goto out;
2814 }
2815
2816 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2817
2818 if (ue->hard) {
2819 __xfrm_state_delete(x);
2820 xfrm_audit_state_delete(x, 1, true);
2821 }
2822 err = 0;
2823 out:
2824 spin_unlock_bh(&x->lock);
2825 xfrm_state_put(x);
2826 return err;
2827 }
2828
2829 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2830 struct nlattr **attrs,
2831 struct netlink_ext_ack *extack)
2832 {
2833 struct net *net = sock_net(skb->sk);
2834 struct xfrm_policy *xp;
2835 struct xfrm_user_tmpl *ut;
2836 int i;
2837 struct nlattr *rt = attrs[XFRMA_TMPL];
2838 struct xfrm_mark mark;
2839
2840 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2841 struct xfrm_state *x = xfrm_state_alloc(net);
2842 int err = -ENOMEM;
2843
2844 if (!x)
2845 goto nomem;
2846
2847 xfrm_mark_get(attrs, &mark);
2848
2849 err = verify_newpolicy_info(&ua->policy, extack);
2850 if (err)
2851 goto free_state;
2852 err = verify_sec_ctx_len(attrs, extack);
2853 if (err)
2854 goto free_state;
2855
2856 /* build an XP */
2857 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
2858 if (!xp)
2859 goto free_state;
2860
2861 memcpy(&x->id, &ua->id, sizeof(ua->id));
2862 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2863 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2864 xp->mark.m = x->mark.m = mark.m;
2865 xp->mark.v = x->mark.v = mark.v;
2866 ut = nla_data(rt);
2867 /* extract the templates and for each call km_key */
2868 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2869 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2870 memcpy(&x->id, &t->id, sizeof(x->id));
2871 x->props.mode = t->mode;
2872 x->props.reqid = t->reqid;
2873 x->props.family = ut->family;
2874 t->aalgos = ua->aalgos;
2875 t->ealgos = ua->ealgos;
2876 t->calgos = ua->calgos;
2877 err = km_query(x, t, xp);
2878
2879 }
2880
2881 xfrm_state_free(x);
2882 kfree(xp);
2883
2884 return 0;
2885
2886 free_state:
2887 xfrm_state_free(x);
2888 nomem:
2889 return err;
2890 }
2891
2892 #ifdef CONFIG_XFRM_MIGRATE
2893 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2894 struct xfrm_kmaddress *k,
2895 struct nlattr **attrs, int *num,
2896 struct netlink_ext_ack *extack)
2897 {
2898 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2899 struct xfrm_user_migrate *um;
2900 int i, num_migrate;
2901
2902 if (k != NULL) {
2903 struct xfrm_user_kmaddress *uk;
2904
2905 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2906 memcpy(&k->local, &uk->local, sizeof(k->local));
2907 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2908 k->family = uk->family;
2909 k->reserved = uk->reserved;
2910 }
2911
2912 um = nla_data(rt);
2913 num_migrate = nla_len(rt) / sizeof(*um);
2914
2915 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) {
2916 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
2917 return -EINVAL;
2918 }
2919
2920 for (i = 0; i < num_migrate; i++, um++, ma++) {
2921 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2922 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2923 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2924 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2925
2926 ma->proto = um->proto;
2927 ma->mode = um->mode;
2928 ma->reqid = um->reqid;
2929
2930 ma->old_family = um->old_family;
2931 ma->new_family = um->new_family;
2932 }
2933
2934 *num = i;
2935 return 0;
2936 }
2937
2938 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2939 struct nlattr **attrs, struct netlink_ext_ack *extack)
2940 {
2941 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2942 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2943 struct xfrm_kmaddress km, *kmp;
2944 u8 type;
2945 int err;
2946 int n = 0;
2947 struct net *net = sock_net(skb->sk);
2948 struct xfrm_encap_tmpl *encap = NULL;
2949 u32 if_id = 0;
2950
2951 if (!attrs[XFRMA_MIGRATE]) {
2952 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
2953 return -EINVAL;
2954 }
2955
2956 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2957
2958 err = copy_from_user_policy_type(&type, attrs, extack);
2959 if (err)
2960 return err;
2961
2962 err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
2963 if (err)
2964 return err;
2965
2966 if (!n)
2967 return 0;
2968
2969 if (attrs[XFRMA_ENCAP]) {
2970 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2971 sizeof(*encap), GFP_KERNEL);
2972 if (!encap)
2973 return -ENOMEM;
2974 }
2975
2976 if (attrs[XFRMA_IF_ID])
2977 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2978
2979 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
2980 if_id, extack);
2981
2982 kfree(encap);
2983
2984 return err;
2985 }
2986 #else
2987 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2988 struct nlattr **attrs, struct netlink_ext_ack *extack)
2989 {
2990 return -ENOPROTOOPT;
2991 }
2992 #endif
2993
2994 #ifdef CONFIG_XFRM_MIGRATE
2995 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2996 {
2997 struct xfrm_user_migrate um;
2998
2999 memset(&um, 0, sizeof(um));
3000 um.proto = m->proto;
3001 um.mode = m->mode;
3002 um.reqid = m->reqid;
3003 um.old_family = m->old_family;
3004 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
3005 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
3006 um.new_family = m->new_family;
3007 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
3008 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
3009
3010 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
3011 }
3012
3013 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
3014 {
3015 struct xfrm_user_kmaddress uk;
3016
3017 memset(&uk, 0, sizeof(uk));
3018 uk.family = k->family;
3019 uk.reserved = k->reserved;
3020 memcpy(&uk.local, &k->local, sizeof(uk.local));
3021 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
3022
3023 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
3024 }
3025
3026 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
3027 int with_encp)
3028 {
3029 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
3030 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
3031 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
3032 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
3033 + userpolicy_type_attrsize();
3034 }
3035
3036 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
3037 int num_migrate, const struct xfrm_kmaddress *k,
3038 const struct xfrm_selector *sel,
3039 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
3040 {
3041 const struct xfrm_migrate *mp;
3042 struct xfrm_userpolicy_id *pol_id;
3043 struct nlmsghdr *nlh;
3044 int i, err;
3045
3046 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
3047 if (nlh == NULL)
3048 return -EMSGSIZE;
3049
3050 pol_id = nlmsg_data(nlh);
3051 /* copy data from selector, dir, and type to the pol_id */
3052 memset(pol_id, 0, sizeof(*pol_id));
3053 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
3054 pol_id->dir = dir;
3055
3056 if (k != NULL) {
3057 err = copy_to_user_kmaddress(k, skb);
3058 if (err)
3059 goto out_cancel;
3060 }
3061 if (encap) {
3062 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
3063 if (err)
3064 goto out_cancel;
3065 }
3066 err = copy_to_user_policy_type(type, skb);
3067 if (err)
3068 goto out_cancel;
3069 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
3070 err = copy_to_user_migrate(mp, skb);
3071 if (err)
3072 goto out_cancel;
3073 }
3074
3075 nlmsg_end(skb, nlh);
3076 return 0;
3077
3078 out_cancel:
3079 nlmsg_cancel(skb, nlh);
3080 return err;
3081 }
3082
3083 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3084 const struct xfrm_migrate *m, int num_migrate,
3085 const struct xfrm_kmaddress *k,
3086 const struct xfrm_encap_tmpl *encap)
3087 {
3088 struct net *net = &init_net;
3089 struct sk_buff *skb;
3090 int err;
3091
3092 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
3093 GFP_ATOMIC);
3094 if (skb == NULL)
3095 return -ENOMEM;
3096
3097 /* build migrate */
3098 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
3099 BUG_ON(err < 0);
3100
3101 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
3102 }
3103 #else
3104 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3105 const struct xfrm_migrate *m, int num_migrate,
3106 const struct xfrm_kmaddress *k,
3107 const struct xfrm_encap_tmpl *encap)
3108 {
3109 return -ENOPROTOOPT;
3110 }
3111 #endif
3112
3113 #define XMSGSIZE(type) sizeof(struct type)
3114
3115 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
3116 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3117 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3118 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3119 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3120 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3121 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3122 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
3123 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
3124 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
3125 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3126 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3127 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
3128 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
3129 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
3130 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3131 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3132 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
3133 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3134 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
3135 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3136 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3137 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3138 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3139 };
3140 EXPORT_SYMBOL_GPL(xfrm_msg_min);
3141
3142 #undef XMSGSIZE
3143
3144 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
3145 [XFRMA_UNSPEC] = { .strict_start_type = XFRMA_SA_DIR },
3146 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
3147 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
3148 [XFRMA_LASTUSED] = { .type = NLA_U64},
3149 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
3150 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
3151 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
3152 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
3153 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
3154 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
3155 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
3156 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
3157 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
3158 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
3159 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
3160 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
3161 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
3162 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
3163 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
3164 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
3165 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
3166 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
3167 [XFRMA_TFCPAD] = { .type = NLA_U32 },
3168 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
3169 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
3170 [XFRMA_PROTO] = { .type = NLA_U8 },
3171 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
3172 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
3173 [XFRMA_SET_MARK] = { .type = NLA_U32 },
3174 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
3175 [XFRMA_IF_ID] = { .type = NLA_U32 },
3176 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
3177 [XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
3178 [XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 },
3179 };
3180 EXPORT_SYMBOL_GPL(xfrma_policy);
3181
3182 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
3183 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3184 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3185 };
3186
3187 static const struct xfrm_link {
3188 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **,
3189 struct netlink_ext_ack *);
3190 int (*start)(struct netlink_callback *);
3191 int (*dump)(struct sk_buff *, struct netlink_callback *);
3192 int (*done)(struct netlink_callback *);
3193 const struct nla_policy *nla_pol;
3194 int nla_max;
3195 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
3196 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3197 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
3198 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
3199 .dump = xfrm_dump_sa,
3200 .done = xfrm_dump_sa_done },
3201 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3202 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
3203 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
3204 .start = xfrm_dump_policy_start,
3205 .dump = xfrm_dump_policy,
3206 .done = xfrm_dump_policy_done },
3207 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
3208 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
3209 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
3210 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3211 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3212 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
3213 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
3214 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
3215 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
3216 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
3217 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
3218 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
3219 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
3220 .nla_pol = xfrma_spd_policy,
3221 .nla_max = XFRMA_SPD_MAX },
3222 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
3223 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
3224 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
3225 };
3226
3227 static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
3228 struct netlink_ext_ack *extack)
3229 {
3230 if (attrs[XFRMA_SA_DIR]) {
3231 switch (type) {
3232 case XFRM_MSG_NEWSA:
3233 case XFRM_MSG_UPDSA:
3234 case XFRM_MSG_ALLOCSPI:
3235 break;
3236 default:
3237 NL_SET_ERR_MSG(extack, "Invalid attribute SA_DIR");
3238 return -EINVAL;
3239 }
3240 }
3241
3242 return 0;
3243 }
3244
3245 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
3246 struct netlink_ext_ack *extack)
3247 {
3248 struct net *net = sock_net(skb->sk);
3249 struct nlattr *attrs[XFRMA_MAX+1];
3250 const struct xfrm_link *link;
3251 struct nlmsghdr *nlh64 = NULL;
3252 int type, err;
3253
3254 type = nlh->nlmsg_type;
3255 if (type > XFRM_MSG_MAX)
3256 return -EINVAL;
3257
3258 type -= XFRM_MSG_BASE;
3259 link = &xfrm_dispatch[type];
3260
3261 /* All operations require privileges, even GET */
3262 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
3263 return -EPERM;
3264
3265 if (in_compat_syscall()) {
3266 struct xfrm_translator *xtr = xfrm_get_translator();
3267
3268 if (!xtr)
3269 return -EOPNOTSUPP;
3270
3271 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
3272 link->nla_pol, extack);
3273 xfrm_put_translator(xtr);
3274 if (IS_ERR(nlh64))
3275 return PTR_ERR(nlh64);
3276 if (nlh64)
3277 nlh = nlh64;
3278 }
3279
3280 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
3281 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
3282 (nlh->nlmsg_flags & NLM_F_DUMP)) {
3283 struct netlink_dump_control c = {
3284 .start = link->start,
3285 .dump = link->dump,
3286 .done = link->done,
3287 };
3288
3289 if (link->dump == NULL) {
3290 err = -EINVAL;
3291 goto err;
3292 }
3293
3294 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
3295 goto err;
3296 }
3297
3298 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
3299 link->nla_max ? : XFRMA_MAX,
3300 link->nla_pol ? : xfrma_policy, extack);
3301 if (err < 0)
3302 goto err;
3303
3304 if (!link->nla_pol || link->nla_pol == xfrma_policy) {
3305 err = xfrm_reject_unused_attr((type + XFRM_MSG_BASE), attrs, extack);
3306 if (err < 0)
3307 goto err;
3308 }
3309
3310 if (link->doit == NULL) {
3311 err = -EINVAL;
3312 goto err;
3313 }
3314
3315 err = link->doit(skb, nlh, attrs, extack);
3316
3317 /* We need to free skb allocated in xfrm_alloc_compat() before
3318 * returning from this function, because consume_skb() won't take
3319 * care of frag_list since netlink destructor sets
3320 * sbk->head to NULL. (see netlink_skb_destructor())
3321 */
3322 if (skb_has_frag_list(skb)) {
3323 kfree_skb(skb_shinfo(skb)->frag_list);
3324 skb_shinfo(skb)->frag_list = NULL;
3325 }
3326
3327 err:
3328 kvfree(nlh64);
3329 return err;
3330 }
3331
3332 static void xfrm_netlink_rcv(struct sk_buff *skb)
3333 {
3334 struct net *net = sock_net(skb->sk);
3335
3336 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3337 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
3338 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3339 }
3340
3341 static inline unsigned int xfrm_expire_msgsize(void)
3342 {
3343 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) +
3344 nla_total_size(sizeof(struct xfrm_mark)) +
3345 nla_total_size(sizeof_field(struct xfrm_state, dir));
3346 }
3347
3348 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
3349 {
3350 struct xfrm_user_expire *ue;
3351 struct nlmsghdr *nlh;
3352 int err;
3353
3354 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
3355 if (nlh == NULL)
3356 return -EMSGSIZE;
3357
3358 ue = nlmsg_data(nlh);
3359 copy_to_user_state(x, &ue->state);
3360 ue->hard = (c->data.hard != 0) ? 1 : 0;
3361 /* clear the padding bytes */
3362 memset_after(ue, 0, hard);
3363
3364 err = xfrm_mark_put(skb, &x->mark);
3365 if (err)
3366 return err;
3367
3368 err = xfrm_if_id_put(skb, x->if_id);
3369 if (err)
3370 return err;
3371
3372 if (x->dir) {
3373 err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
3374 if (err)
3375 return err;
3376 }
3377
3378 nlmsg_end(skb, nlh);
3379 return 0;
3380 }
3381
3382 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
3383 {
3384 struct net *net = xs_net(x);
3385 struct sk_buff *skb;
3386
3387 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
3388 if (skb == NULL)
3389 return -ENOMEM;
3390
3391 if (build_expire(skb, x, c) < 0) {
3392 kfree_skb(skb);
3393 return -EMSGSIZE;
3394 }
3395
3396 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3397 }
3398
3399 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3400 {
3401 struct net *net = xs_net(x);
3402 struct sk_buff *skb;
3403 int err;
3404
3405 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3406 if (skb == NULL)
3407 return -ENOMEM;
3408
3409 err = build_aevent(skb, x, c);
3410 BUG_ON(err < 0);
3411
3412 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3413 }
3414
3415 static int xfrm_notify_sa_flush(const struct km_event *c)
3416 {
3417 struct net *net = c->net;
3418 struct xfrm_usersa_flush *p;
3419 struct nlmsghdr *nlh;
3420 struct sk_buff *skb;
3421 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3422
3423 skb = nlmsg_new(len, GFP_ATOMIC);
3424 if (skb == NULL)
3425 return -ENOMEM;
3426
3427 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3428 if (nlh == NULL) {
3429 kfree_skb(skb);
3430 return -EMSGSIZE;
3431 }
3432
3433 p = nlmsg_data(nlh);
3434 p->proto = c->data.proto;
3435
3436 nlmsg_end(skb, nlh);
3437
3438 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3439 }
3440
3441 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3442 {
3443 unsigned int l = 0;
3444 if (x->aead)
3445 l += nla_total_size(aead_len(x->aead));
3446 if (x->aalg) {
3447 l += nla_total_size(sizeof(struct xfrm_algo) +
3448 (x->aalg->alg_key_len + 7) / 8);
3449 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3450 }
3451 if (x->ealg)
3452 l += nla_total_size(xfrm_alg_len(x->ealg));
3453 if (x->calg)
3454 l += nla_total_size(sizeof(*x->calg));
3455 if (x->encap)
3456 l += nla_total_size(sizeof(*x->encap));
3457 if (x->tfcpad)
3458 l += nla_total_size(sizeof(x->tfcpad));
3459 if (x->replay_esn)
3460 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3461 else
3462 l += nla_total_size(sizeof(struct xfrm_replay_state));
3463 if (x->security)
3464 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3465 x->security->ctx_len);
3466 if (x->coaddr)
3467 l += nla_total_size(sizeof(*x->coaddr));
3468 if (x->props.extra_flags)
3469 l += nla_total_size(sizeof(x->props.extra_flags));
3470 if (x->xso.dev)
3471 l += nla_total_size(sizeof(struct xfrm_user_offload));
3472 if (x->props.smark.v | x->props.smark.m) {
3473 l += nla_total_size(sizeof(x->props.smark.v));
3474 l += nla_total_size(sizeof(x->props.smark.m));
3475 }
3476 if (x->if_id)
3477 l += nla_total_size(sizeof(x->if_id));
3478
3479 /* Must count x->lastused as it may become non-zero behind our back. */
3480 l += nla_total_size_64bit(sizeof(u64));
3481
3482 if (x->mapping_maxage)
3483 l += nla_total_size(sizeof(x->mapping_maxage));
3484
3485 if (x->dir)
3486 l += nla_total_size(sizeof(x->dir));
3487
3488 if (x->nat_keepalive_interval)
3489 l += nla_total_size(sizeof(x->nat_keepalive_interval));
3490
3491 return l;
3492 }
3493
3494 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3495 {
3496 struct net *net = xs_net(x);
3497 struct xfrm_usersa_info *p;
3498 struct xfrm_usersa_id *id;
3499 struct nlmsghdr *nlh;
3500 struct sk_buff *skb;
3501 unsigned int len = xfrm_sa_len(x);
3502 unsigned int headlen;
3503 int err;
3504
3505 headlen = sizeof(*p);
3506 if (c->event == XFRM_MSG_DELSA) {
3507 len += nla_total_size(headlen);
3508 headlen = sizeof(*id);
3509 len += nla_total_size(sizeof(struct xfrm_mark));
3510 }
3511 len += NLMSG_ALIGN(headlen);
3512
3513 skb = nlmsg_new(len, GFP_ATOMIC);
3514 if (skb == NULL)
3515 return -ENOMEM;
3516
3517 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3518 err = -EMSGSIZE;
3519 if (nlh == NULL)
3520 goto out_free_skb;
3521
3522 p = nlmsg_data(nlh);
3523 if (c->event == XFRM_MSG_DELSA) {
3524 struct nlattr *attr;
3525
3526 id = nlmsg_data(nlh);
3527 memset(id, 0, sizeof(*id));
3528 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3529 id->spi = x->id.spi;
3530 id->family = x->props.family;
3531 id->proto = x->id.proto;
3532
3533 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3534 err = -EMSGSIZE;
3535 if (attr == NULL)
3536 goto out_free_skb;
3537
3538 p = nla_data(attr);
3539 }
3540 err = copy_to_user_state_extra(x, p, skb);
3541 if (err)
3542 goto out_free_skb;
3543
3544 nlmsg_end(skb, nlh);
3545
3546 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3547
3548 out_free_skb:
3549 kfree_skb(skb);
3550 return err;
3551 }
3552
3553 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3554 {
3555
3556 switch (c->event) {
3557 case XFRM_MSG_EXPIRE:
3558 return xfrm_exp_state_notify(x, c);
3559 case XFRM_MSG_NEWAE:
3560 return xfrm_aevent_state_notify(x, c);
3561 case XFRM_MSG_DELSA:
3562 case XFRM_MSG_UPDSA:
3563 case XFRM_MSG_NEWSA:
3564 return xfrm_notify_sa(x, c);
3565 case XFRM_MSG_FLUSHSA:
3566 return xfrm_notify_sa_flush(c);
3567 default:
3568 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3569 c->event);
3570 break;
3571 }
3572
3573 return 0;
3574
3575 }
3576
3577 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3578 struct xfrm_policy *xp)
3579 {
3580 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3581 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3582 + nla_total_size(sizeof(struct xfrm_mark))
3583 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3584 + userpolicy_type_attrsize();
3585 }
3586
3587 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3588 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3589 {
3590 __u32 seq = xfrm_get_acqseq();
3591 struct xfrm_user_acquire *ua;
3592 struct nlmsghdr *nlh;
3593 int err;
3594
3595 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3596 if (nlh == NULL)
3597 return -EMSGSIZE;
3598
3599 ua = nlmsg_data(nlh);
3600 memcpy(&ua->id, &x->id, sizeof(ua->id));
3601 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3602 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3603 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3604 ua->aalgos = xt->aalgos;
3605 ua->ealgos = xt->ealgos;
3606 ua->calgos = xt->calgos;
3607 ua->seq = x->km.seq = seq;
3608
3609 err = copy_to_user_tmpl(xp, skb);
3610 if (!err)
3611 err = copy_to_user_state_sec_ctx(x, skb);
3612 if (!err)
3613 err = copy_to_user_policy_type(xp->type, skb);
3614 if (!err)
3615 err = xfrm_mark_put(skb, &xp->mark);
3616 if (!err)
3617 err = xfrm_if_id_put(skb, xp->if_id);
3618 if (!err && xp->xdo.dev)
3619 err = copy_user_offload(&xp->xdo, skb);
3620 if (err) {
3621 nlmsg_cancel(skb, nlh);
3622 return err;
3623 }
3624
3625 nlmsg_end(skb, nlh);
3626 return 0;
3627 }
3628
3629 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3630 struct xfrm_policy *xp)
3631 {
3632 struct net *net = xs_net(x);
3633 struct sk_buff *skb;
3634 int err;
3635
3636 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3637 if (skb == NULL)
3638 return -ENOMEM;
3639
3640 err = build_acquire(skb, x, xt, xp);
3641 BUG_ON(err < 0);
3642
3643 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3644 }
3645
3646 /* User gives us xfrm_user_policy_info followed by an array of 0
3647 * or more templates.
3648 */
3649 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3650 u8 *data, int len, int *dir)
3651 {
3652 struct net *net = sock_net(sk);
3653 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3654 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3655 struct xfrm_policy *xp;
3656 int nr;
3657
3658 switch (sk->sk_family) {
3659 case AF_INET:
3660 if (opt != IP_XFRM_POLICY) {
3661 *dir = -EOPNOTSUPP;
3662 return NULL;
3663 }
3664 break;
3665 #if IS_ENABLED(CONFIG_IPV6)
3666 case AF_INET6:
3667 if (opt != IPV6_XFRM_POLICY) {
3668 *dir = -EOPNOTSUPP;
3669 return NULL;
3670 }
3671 break;
3672 #endif
3673 default:
3674 *dir = -EINVAL;
3675 return NULL;
3676 }
3677
3678 *dir = -EINVAL;
3679
3680 if (len < sizeof(*p) ||
3681 verify_newpolicy_info(p, NULL))
3682 return NULL;
3683
3684 nr = ((len - sizeof(*p)) / sizeof(*ut));
3685 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
3686 return NULL;
3687
3688 if (p->dir > XFRM_POLICY_OUT)
3689 return NULL;
3690
3691 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3692 if (xp == NULL) {
3693 *dir = -ENOBUFS;
3694 return NULL;
3695 }
3696
3697 copy_from_user_policy(xp, p);
3698 xp->type = XFRM_POLICY_TYPE_MAIN;
3699 copy_templates(xp, ut, nr);
3700
3701 *dir = p->dir;
3702
3703 return xp;
3704 }
3705
3706 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3707 {
3708 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3709 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3710 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3711 + nla_total_size(sizeof(struct xfrm_mark))
3712 + userpolicy_type_attrsize();
3713 }
3714
3715 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3716 int dir, const struct km_event *c)
3717 {
3718 struct xfrm_user_polexpire *upe;
3719 int hard = c->data.hard;
3720 struct nlmsghdr *nlh;
3721 int err;
3722
3723 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3724 if (nlh == NULL)
3725 return -EMSGSIZE;
3726
3727 upe = nlmsg_data(nlh);
3728 copy_to_user_policy(xp, &upe->pol, dir);
3729 err = copy_to_user_tmpl(xp, skb);
3730 if (!err)
3731 err = copy_to_user_sec_ctx(xp, skb);
3732 if (!err)
3733 err = copy_to_user_policy_type(xp->type, skb);
3734 if (!err)
3735 err = xfrm_mark_put(skb, &xp->mark);
3736 if (!err)
3737 err = xfrm_if_id_put(skb, xp->if_id);
3738 if (!err && xp->xdo.dev)
3739 err = copy_user_offload(&xp->xdo, skb);
3740 if (err) {
3741 nlmsg_cancel(skb, nlh);
3742 return err;
3743 }
3744 upe->hard = !!hard;
3745
3746 nlmsg_end(skb, nlh);
3747 return 0;
3748 }
3749
3750 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3751 {
3752 struct net *net = xp_net(xp);
3753 struct sk_buff *skb;
3754 int err;
3755
3756 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3757 if (skb == NULL)
3758 return -ENOMEM;
3759
3760 err = build_polexpire(skb, xp, dir, c);
3761 BUG_ON(err < 0);
3762
3763 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3764 }
3765
3766 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3767 {
3768 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3769 struct net *net = xp_net(xp);
3770 struct xfrm_userpolicy_info *p;
3771 struct xfrm_userpolicy_id *id;
3772 struct nlmsghdr *nlh;
3773 struct sk_buff *skb;
3774 unsigned int headlen;
3775 int err;
3776
3777 headlen = sizeof(*p);
3778 if (c->event == XFRM_MSG_DELPOLICY) {
3779 len += nla_total_size(headlen);
3780 headlen = sizeof(*id);
3781 }
3782 len += userpolicy_type_attrsize();
3783 len += nla_total_size(sizeof(struct xfrm_mark));
3784 len += NLMSG_ALIGN(headlen);
3785
3786 skb = nlmsg_new(len, GFP_ATOMIC);
3787 if (skb == NULL)
3788 return -ENOMEM;
3789
3790 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3791 err = -EMSGSIZE;
3792 if (nlh == NULL)
3793 goto out_free_skb;
3794
3795 p = nlmsg_data(nlh);
3796 if (c->event == XFRM_MSG_DELPOLICY) {
3797 struct nlattr *attr;
3798
3799 id = nlmsg_data(nlh);
3800 memset(id, 0, sizeof(*id));
3801 id->dir = dir;
3802 if (c->data.byid)
3803 id->index = xp->index;
3804 else
3805 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3806
3807 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3808 err = -EMSGSIZE;
3809 if (attr == NULL)
3810 goto out_free_skb;
3811
3812 p = nla_data(attr);
3813 }
3814
3815 copy_to_user_policy(xp, p, dir);
3816 err = copy_to_user_tmpl(xp, skb);
3817 if (!err)
3818 err = copy_to_user_policy_type(xp->type, skb);
3819 if (!err)
3820 err = xfrm_mark_put(skb, &xp->mark);
3821 if (!err)
3822 err = xfrm_if_id_put(skb, xp->if_id);
3823 if (!err && xp->xdo.dev)
3824 err = copy_user_offload(&xp->xdo, skb);
3825 if (err)
3826 goto out_free_skb;
3827
3828 nlmsg_end(skb, nlh);
3829
3830 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3831
3832 out_free_skb:
3833 kfree_skb(skb);
3834 return err;
3835 }
3836
3837 static int xfrm_notify_policy_flush(const struct km_event *c)
3838 {
3839 struct net *net = c->net;
3840 struct nlmsghdr *nlh;
3841 struct sk_buff *skb;
3842 int err;
3843
3844 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3845 if (skb == NULL)
3846 return -ENOMEM;
3847
3848 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3849 err = -EMSGSIZE;
3850 if (nlh == NULL)
3851 goto out_free_skb;
3852 err = copy_to_user_policy_type(c->data.type, skb);
3853 if (err)
3854 goto out_free_skb;
3855
3856 nlmsg_end(skb, nlh);
3857
3858 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3859
3860 out_free_skb:
3861 kfree_skb(skb);
3862 return err;
3863 }
3864
3865 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3866 {
3867
3868 switch (c->event) {
3869 case XFRM_MSG_NEWPOLICY:
3870 case XFRM_MSG_UPDPOLICY:
3871 case XFRM_MSG_DELPOLICY:
3872 return xfrm_notify_policy(xp, dir, c);
3873 case XFRM_MSG_FLUSHPOLICY:
3874 return xfrm_notify_policy_flush(c);
3875 case XFRM_MSG_POLEXPIRE:
3876 return xfrm_exp_policy_notify(xp, dir, c);
3877 default:
3878 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3879 c->event);
3880 }
3881
3882 return 0;
3883
3884 }
3885
3886 static inline unsigned int xfrm_report_msgsize(void)
3887 {
3888 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3889 }
3890
3891 static int build_report(struct sk_buff *skb, u8 proto,
3892 struct xfrm_selector *sel, xfrm_address_t *addr)
3893 {
3894 struct xfrm_user_report *ur;
3895 struct nlmsghdr *nlh;
3896
3897 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3898 if (nlh == NULL)
3899 return -EMSGSIZE;
3900
3901 ur = nlmsg_data(nlh);
3902 ur->proto = proto;
3903 memcpy(&ur->sel, sel, sizeof(ur->sel));
3904
3905 if (addr) {
3906 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3907 if (err) {
3908 nlmsg_cancel(skb, nlh);
3909 return err;
3910 }
3911 }
3912 nlmsg_end(skb, nlh);
3913 return 0;
3914 }
3915
3916 static int xfrm_send_report(struct net *net, u8 proto,
3917 struct xfrm_selector *sel, xfrm_address_t *addr)
3918 {
3919 struct sk_buff *skb;
3920 int err;
3921
3922 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3923 if (skb == NULL)
3924 return -ENOMEM;
3925
3926 err = build_report(skb, proto, sel, addr);
3927 BUG_ON(err < 0);
3928
3929 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3930 }
3931
3932 static inline unsigned int xfrm_mapping_msgsize(void)
3933 {
3934 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3935 }
3936
3937 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3938 xfrm_address_t *new_saddr, __be16 new_sport)
3939 {
3940 struct xfrm_user_mapping *um;
3941 struct nlmsghdr *nlh;
3942
3943 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3944 if (nlh == NULL)
3945 return -EMSGSIZE;
3946
3947 um = nlmsg_data(nlh);
3948
3949 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3950 um->id.spi = x->id.spi;
3951 um->id.family = x->props.family;
3952 um->id.proto = x->id.proto;
3953 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3954 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3955 um->new_sport = new_sport;
3956 um->old_sport = x->encap->encap_sport;
3957 um->reqid = x->props.reqid;
3958
3959 nlmsg_end(skb, nlh);
3960 return 0;
3961 }
3962
3963 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3964 __be16 sport)
3965 {
3966 struct net *net = xs_net(x);
3967 struct sk_buff *skb;
3968 int err;
3969
3970 if (x->id.proto != IPPROTO_ESP)
3971 return -EINVAL;
3972
3973 if (!x->encap)
3974 return -EINVAL;
3975
3976 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3977 if (skb == NULL)
3978 return -ENOMEM;
3979
3980 err = build_mapping(skb, x, ipaddr, sport);
3981 BUG_ON(err < 0);
3982
3983 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3984 }
3985
3986 static bool xfrm_is_alive(const struct km_event *c)
3987 {
3988 return (bool)xfrm_acquire_is_on(c->net);
3989 }
3990
3991 static struct xfrm_mgr netlink_mgr = {
3992 .notify = xfrm_send_state_notify,
3993 .acquire = xfrm_send_acquire,
3994 .compile_policy = xfrm_compile_policy,
3995 .notify_policy = xfrm_send_policy_notify,
3996 .report = xfrm_send_report,
3997 .migrate = xfrm_send_migrate,
3998 .new_mapping = xfrm_send_mapping,
3999 .is_alive = xfrm_is_alive,
4000 };
4001
4002 static int __net_init xfrm_user_net_init(struct net *net)
4003 {
4004 struct sock *nlsk;
4005 struct netlink_kernel_cfg cfg = {
4006 .groups = XFRMNLGRP_MAX,
4007 .input = xfrm_netlink_rcv,
4008 };
4009
4010 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
4011 if (nlsk == NULL)
4012 return -ENOMEM;
4013 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
4014 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
4015 return 0;
4016 }
4017
4018 static void __net_exit xfrm_user_net_pre_exit(struct net *net)
4019 {
4020 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
4021 }
4022
4023 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
4024 {
4025 struct net *net;
4026
4027 list_for_each_entry(net, net_exit_list, exit_list)
4028 netlink_kernel_release(net->xfrm.nlsk_stash);
4029 }
4030
4031 static struct pernet_operations xfrm_user_net_ops = {
4032 .init = xfrm_user_net_init,
4033 .pre_exit = xfrm_user_net_pre_exit,
4034 .exit_batch = xfrm_user_net_exit,
4035 };
4036
4037 static int __init xfrm_user_init(void)
4038 {
4039 int rv;
4040
4041 printk(KERN_INFO "Initializing XFRM netlink socket\n");
4042
4043 rv = register_pernet_subsys(&xfrm_user_net_ops);
4044 if (rv < 0)
4045 return rv;
4046 xfrm_register_km(&netlink_mgr);
4047 return 0;
4048 }
4049
4050 static void __exit xfrm_user_exit(void)
4051 {
4052 xfrm_unregister_km(&netlink_mgr);
4053 unregister_pernet_subsys(&xfrm_user_net_ops);
4054 }
4055
4056 module_init(xfrm_user_init);
4057 module_exit(xfrm_user_exit);
4058 MODULE_DESCRIPTION("XFRM User interface");
4059 MODULE_LICENSE("GPL");
4060 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
4061
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