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printf: Remove unused 'bprintf'
[drm/drm-misc.git] / net / xfrm / xfrm_user.c
blobb2876e09328b6296958e994f0ed3a504559245ce
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 <linux/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 = nla_get_u8_default(attrs[XFRMA_SA_DIR], 0);
204 u16 family = p->sel.family;
205
206 err = -EINVAL;
207 switch (p->family) {
208 case AF_INET:
209 break;
210
211 case AF_INET6:
212 #if IS_ENABLED(CONFIG_IPV6)
213 break;
214 #else
215 err = -EAFNOSUPPORT;
216 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
217 goto out;
218 #endif
219
220 default:
221 NL_SET_ERR_MSG(extack, "Invalid address family");
222 goto out;
223 }
224
225 if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
226 family = p->family;
227
228 switch (family) {
229 case AF_UNSPEC:
230 break;
231
232 case AF_INET:
233 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
234 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
235 goto out;
236 }
237
238 break;
239
240 case AF_INET6:
241 #if IS_ENABLED(CONFIG_IPV6)
242 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
243 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
244 goto out;
245 }
246
247 break;
248 #else
249 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
250 err = -EAFNOSUPPORT;
251 goto out;
252 #endif
253
254 default:
255 NL_SET_ERR_MSG(extack, "Invalid address family in selector");
256 goto out;
257 }
258
259 err = -EINVAL;
260 switch (p->id.proto) {
261 case IPPROTO_AH:
262 if (!attrs[XFRMA_ALG_AUTH] &&
263 !attrs[XFRMA_ALG_AUTH_TRUNC]) {
264 NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
265 goto out;
266 }
267
268 if (attrs[XFRMA_ALG_AEAD] ||
269 attrs[XFRMA_ALG_CRYPT] ||
270 attrs[XFRMA_ALG_COMP] ||
271 attrs[XFRMA_TFCPAD]) {
272 NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
273 goto out;
274 }
275 break;
276
277 case IPPROTO_ESP:
278 if (attrs[XFRMA_ALG_COMP]) {
279 NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
280 goto out;
281 }
282
283 if (!attrs[XFRMA_ALG_AUTH] &&
284 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
285 !attrs[XFRMA_ALG_CRYPT] &&
286 !attrs[XFRMA_ALG_AEAD]) {
287 NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
288 goto out;
289 }
290
291 if ((attrs[XFRMA_ALG_AUTH] ||
292 attrs[XFRMA_ALG_AUTH_TRUNC] ||
293 attrs[XFRMA_ALG_CRYPT]) &&
294 attrs[XFRMA_ALG_AEAD]) {
295 NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
296 goto out;
297 }
298
299 if (attrs[XFRMA_TFCPAD] &&
300 p->mode != XFRM_MODE_TUNNEL) {
301 NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
302 goto out;
303 }
304 break;
305
306 case IPPROTO_COMP:
307 if (!attrs[XFRMA_ALG_COMP]) {
308 NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
309 goto out;
310 }
311
312 if (attrs[XFRMA_ALG_AEAD] ||
313 attrs[XFRMA_ALG_AUTH] ||
314 attrs[XFRMA_ALG_AUTH_TRUNC] ||
315 attrs[XFRMA_ALG_CRYPT] ||
316 attrs[XFRMA_TFCPAD]) {
317 NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
318 goto out;
319 }
320
321 if (ntohl(p->id.spi) >= 0x10000) {
322 NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
323 goto out;
324 }
325 break;
326
327 #if IS_ENABLED(CONFIG_IPV6)
328 case IPPROTO_DSTOPTS:
329 case IPPROTO_ROUTING:
330 if (attrs[XFRMA_ALG_COMP] ||
331 attrs[XFRMA_ALG_AUTH] ||
332 attrs[XFRMA_ALG_AUTH_TRUNC] ||
333 attrs[XFRMA_ALG_AEAD] ||
334 attrs[XFRMA_ALG_CRYPT] ||
335 attrs[XFRMA_ENCAP] ||
336 attrs[XFRMA_SEC_CTX] ||
337 attrs[XFRMA_TFCPAD]) {
338 NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
339 goto out;
340 }
341
342 if (!attrs[XFRMA_COADDR]) {
343 NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
344 goto out;
345 }
346 break;
347 #endif
348
349 default:
350 NL_SET_ERR_MSG(extack, "Unsupported protocol");
351 goto out;
352 }
353
354 if ((err = verify_aead(attrs, extack)))
355 goto out;
356 if ((err = verify_auth_trunc(attrs, extack)))
357 goto out;
358 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
359 goto out;
360 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
361 goto out;
362 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
363 goto out;
364 if ((err = verify_sec_ctx_len(attrs, extack)))
365 goto out;
366 if ((err = verify_replay(p, attrs, sa_dir, extack)))
367 goto out;
368
369 err = -EINVAL;
370 switch (p->mode) {
371 case XFRM_MODE_TRANSPORT:
372 case XFRM_MODE_TUNNEL:
373 case XFRM_MODE_ROUTEOPTIMIZATION:
374 case XFRM_MODE_BEET:
375 break;
376
377 default:
378 NL_SET_ERR_MSG(extack, "Unsupported mode");
379 goto out;
380 }
381
382 err = 0;
383
384 if (attrs[XFRMA_MTIMER_THRESH]) {
385 if (!attrs[XFRMA_ENCAP]) {
386 NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
387 err = -EINVAL;
388 goto out;
389 }
390
391 if (sa_dir == XFRM_SA_DIR_OUT) {
392 NL_SET_ERR_MSG(extack,
393 "MTIMER_THRESH attribute should not be set on output SA");
394 err = -EINVAL;
395 goto out;
396 }
397 }
398
399 if (sa_dir == XFRM_SA_DIR_OUT) {
400 if (p->flags & XFRM_STATE_DECAP_DSCP) {
401 NL_SET_ERR_MSG(extack, "Flag DECAP_DSCP should not be set for output SA");
402 err = -EINVAL;
403 goto out;
404 }
405
406 if (p->flags & XFRM_STATE_ICMP) {
407 NL_SET_ERR_MSG(extack, "Flag ICMP should not be set for output SA");
408 err = -EINVAL;
409 goto out;
410 }
411
412 if (p->flags & XFRM_STATE_WILDRECV) {
413 NL_SET_ERR_MSG(extack, "Flag WILDRECV should not be set for output SA");
414 err = -EINVAL;
415 goto out;
416 }
417
418 if (p->replay_window) {
419 NL_SET_ERR_MSG(extack, "Replay window should be 0 for output SA");
420 err = -EINVAL;
421 goto out;
422 }
423
424 if (attrs[XFRMA_REPLAY_VAL]) {
425 struct xfrm_replay_state *replay;
426
427 replay = nla_data(attrs[XFRMA_REPLAY_VAL]);
428
429 if (replay->seq || replay->bitmap) {
430 NL_SET_ERR_MSG(extack,
431 "Replay seq and bitmap should be 0 for output SA");
432 err = -EINVAL;
433 goto out;
434 }
435 }
436 }
437
438 if (sa_dir == XFRM_SA_DIR_IN) {
439 if (p->flags & XFRM_STATE_NOPMTUDISC) {
440 NL_SET_ERR_MSG(extack, "Flag NOPMTUDISC should not be set for input SA");
441 err = -EINVAL;
442 goto out;
443 }
444
445 if (attrs[XFRMA_SA_EXTRA_FLAGS]) {
446 u32 xflags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
447
448 if (xflags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) {
449 NL_SET_ERR_MSG(extack, "Flag DONT_ENCAP_DSCP should not be set for input SA");
450 err = -EINVAL;
451 goto out;
452 }
453
454 if (xflags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP) {
455 NL_SET_ERR_MSG(extack, "Flag OSEQ_MAY_WRAP should not be set for input SA");
456 err = -EINVAL;
457 goto out;
458 }
459
460 }
461 }
462
463 if (!sa_dir && attrs[XFRMA_SA_PCPU]) {
464 NL_SET_ERR_MSG(extack, "SA_PCPU only supported with SA_DIR");
465 err = -EINVAL;
466 goto out;
467 }
468
469 out:
470 return err;
471 }
472
473 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
474 struct xfrm_algo_desc *(*get_byname)(const char *, int),
475 struct nlattr *rta, struct netlink_ext_ack *extack)
476 {
477 struct xfrm_algo *p, *ualg;
478 struct xfrm_algo_desc *algo;
479
480 if (!rta)
481 return 0;
482
483 ualg = nla_data(rta);
484
485 algo = get_byname(ualg->alg_name, 1);
486 if (!algo) {
487 NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
488 return -ENOSYS;
489 }
490 *props = algo->desc.sadb_alg_id;
491
492 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
493 if (!p)
494 return -ENOMEM;
495
496 strcpy(p->alg_name, algo->name);
497 *algpp = p;
498 return 0;
499 }
500
501 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
502 struct netlink_ext_ack *extack)
503 {
504 struct xfrm_algo *p, *ualg;
505 struct xfrm_algo_desc *algo;
506
507 if (!rta)
508 return 0;
509
510 ualg = nla_data(rta);
511
512 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
513 if (!algo) {
514 NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
515 return -ENOSYS;
516 }
517 x->props.ealgo = algo->desc.sadb_alg_id;
518
519 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
520 if (!p)
521 return -ENOMEM;
522
523 strcpy(p->alg_name, algo->name);
524 x->ealg = p;
525 x->geniv = algo->uinfo.encr.geniv;
526 return 0;
527 }
528
529 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
530 struct nlattr *rta, struct netlink_ext_ack *extack)
531 {
532 struct xfrm_algo *ualg;
533 struct xfrm_algo_auth *p;
534 struct xfrm_algo_desc *algo;
535
536 if (!rta)
537 return 0;
538
539 ualg = nla_data(rta);
540
541 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
542 if (!algo) {
543 NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
544 return -ENOSYS;
545 }
546 *props = algo->desc.sadb_alg_id;
547
548 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
549 if (!p)
550 return -ENOMEM;
551
552 strcpy(p->alg_name, algo->name);
553 p->alg_key_len = ualg->alg_key_len;
554 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
555 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
556
557 *algpp = p;
558 return 0;
559 }
560
561 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
562 struct nlattr *rta, struct netlink_ext_ack *extack)
563 {
564 struct xfrm_algo_auth *p, *ualg;
565 struct xfrm_algo_desc *algo;
566
567 if (!rta)
568 return 0;
569
570 ualg = nla_data(rta);
571
572 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
573 if (!algo) {
574 NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
575 return -ENOSYS;
576 }
577 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
578 NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
579 return -EINVAL;
580 }
581 *props = algo->desc.sadb_alg_id;
582
583 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
584 if (!p)
585 return -ENOMEM;
586
587 strcpy(p->alg_name, algo->name);
588 if (!p->alg_trunc_len)
589 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
590
591 *algpp = p;
592 return 0;
593 }
594
595 static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
596 struct netlink_ext_ack *extack)
597 {
598 struct xfrm_algo_aead *p, *ualg;
599 struct xfrm_algo_desc *algo;
600
601 if (!rta)
602 return 0;
603
604 ualg = nla_data(rta);
605
606 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
607 if (!algo) {
608 NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
609 return -ENOSYS;
610 }
611 x->props.ealgo = algo->desc.sadb_alg_id;
612
613 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
614 if (!p)
615 return -ENOMEM;
616
617 strcpy(p->alg_name, algo->name);
618 x->aead = p;
619 x->geniv = algo->uinfo.aead.geniv;
620 return 0;
621 }
622
623 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
624 struct nlattr *rp,
625 struct netlink_ext_ack *extack)
626 {
627 struct xfrm_replay_state_esn *up;
628 unsigned int ulen;
629
630 if (!replay_esn || !rp)
631 return 0;
632
633 up = nla_data(rp);
634 ulen = xfrm_replay_state_esn_len(up);
635
636 /* Check the overall length and the internal bitmap length to avoid
637 * potential overflow. */
638 if (nla_len(rp) < (int)ulen) {
639 NL_SET_ERR_MSG(extack, "ESN attribute is too short");
640 return -EINVAL;
641 }
642
643 if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
644 NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
645 return -EINVAL;
646 }
647
648 if (replay_esn->bmp_len != up->bmp_len) {
649 NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
650 return -EINVAL;
651 }
652
653 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
654 NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
655 return -EINVAL;
656 }
657
658 return 0;
659 }
660
661 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
662 struct xfrm_replay_state_esn **preplay_esn,
663 struct nlattr *rta)
664 {
665 struct xfrm_replay_state_esn *p, *pp, *up;
666 unsigned int klen, ulen;
667
668 if (!rta)
669 return 0;
670
671 up = nla_data(rta);
672 klen = xfrm_replay_state_esn_len(up);
673 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
674
675 p = kzalloc(klen, GFP_KERNEL);
676 if (!p)
677 return -ENOMEM;
678
679 pp = kzalloc(klen, GFP_KERNEL);
680 if (!pp) {
681 kfree(p);
682 return -ENOMEM;
683 }
684
685 memcpy(p, up, ulen);
686 memcpy(pp, up, ulen);
687
688 *replay_esn = p;
689 *preplay_esn = pp;
690
691 return 0;
692 }
693
694 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
695 {
696 unsigned int len = 0;
697
698 if (xfrm_ctx) {
699 len += sizeof(struct xfrm_user_sec_ctx);
700 len += xfrm_ctx->ctx_len;
701 }
702 return len;
703 }
704
705 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
706 {
707 memcpy(&x->id, &p->id, sizeof(x->id));
708 memcpy(&x->sel, &p->sel, sizeof(x->sel));
709 memcpy(&x->lft, &p->lft, sizeof(x->lft));
710 x->props.mode = p->mode;
711 x->props.replay_window = min_t(unsigned int, p->replay_window,
712 sizeof(x->replay.bitmap) * 8);
713 x->props.reqid = p->reqid;
714 x->props.family = p->family;
715 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
716 x->props.flags = p->flags;
717
718 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
719 x->sel.family = p->family;
720 }
721
722 /*
723 * someday when pfkey also has support, we could have the code
724 * somehow made shareable and move it to xfrm_state.c - JHS
725 *
726 */
727 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
728 int update_esn)
729 {
730 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
731 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
732 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
733 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
734 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
735 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
736
737 if (re && x->replay_esn && x->preplay_esn) {
738 struct xfrm_replay_state_esn *replay_esn;
739 replay_esn = nla_data(re);
740 memcpy(x->replay_esn, replay_esn,
741 xfrm_replay_state_esn_len(replay_esn));
742 memcpy(x->preplay_esn, replay_esn,
743 xfrm_replay_state_esn_len(replay_esn));
744 }
745
746 if (rp) {
747 struct xfrm_replay_state *replay;
748 replay = nla_data(rp);
749 memcpy(&x->replay, replay, sizeof(*replay));
750 memcpy(&x->preplay, replay, sizeof(*replay));
751 }
752
753 if (lt) {
754 struct xfrm_lifetime_cur *ltime;
755 ltime = nla_data(lt);
756 x->curlft.bytes = ltime->bytes;
757 x->curlft.packets = ltime->packets;
758 x->curlft.add_time = ltime->add_time;
759 x->curlft.use_time = ltime->use_time;
760 }
761
762 if (et)
763 x->replay_maxage = nla_get_u32(et);
764
765 if (rt)
766 x->replay_maxdiff = nla_get_u32(rt);
767
768 if (mt)
769 x->mapping_maxage = nla_get_u32(mt);
770 }
771
772 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
773 {
774 if (attrs[XFRMA_SET_MARK]) {
775 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
776 m->m = nla_get_u32_default(attrs[XFRMA_SET_MARK_MASK],
777 0xffffffff);
778 } else {
779 m->v = m->m = 0;
780 }
781 }
782
783 static struct xfrm_state *xfrm_state_construct(struct net *net,
784 struct xfrm_usersa_info *p,
785 struct nlattr **attrs,
786 int *errp,
787 struct netlink_ext_ack *extack)
788 {
789 struct xfrm_state *x = xfrm_state_alloc(net);
790 int err = -ENOMEM;
791
792 if (!x)
793 goto error_no_put;
794
795 copy_from_user_state(x, p);
796
797 if (attrs[XFRMA_ENCAP]) {
798 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
799 sizeof(*x->encap), GFP_KERNEL);
800 if (x->encap == NULL)
801 goto error;
802 }
803
804 if (attrs[XFRMA_COADDR]) {
805 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
806 sizeof(*x->coaddr), GFP_KERNEL);
807 if (x->coaddr == NULL)
808 goto error;
809 }
810
811 if (attrs[XFRMA_SA_EXTRA_FLAGS])
812 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
813
814 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))
815 goto error;
816 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
817 attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
818 goto error;
819 if (!x->props.aalgo) {
820 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
821 attrs[XFRMA_ALG_AUTH], extack)))
822 goto error;
823 }
824 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
825 goto error;
826 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
827 xfrm_calg_get_byname,
828 attrs[XFRMA_ALG_COMP], extack)))
829 goto error;
830
831 if (attrs[XFRMA_TFCPAD])
832 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
833
834 xfrm_mark_get(attrs, &x->mark);
835
836 xfrm_smark_init(attrs, &x->props.smark);
837
838 if (attrs[XFRMA_IF_ID])
839 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
840
841 if (attrs[XFRMA_SA_DIR])
842 x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
843
844 if (attrs[XFRMA_NAT_KEEPALIVE_INTERVAL])
845 x->nat_keepalive_interval =
846 nla_get_u32(attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]);
847
848 if (attrs[XFRMA_SA_PCPU]) {
849 x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
850 if (x->pcpu_num >= num_possible_cpus())
851 goto error;
852 }
853
854 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack);
855 if (err)
856 goto error;
857
858 if (attrs[XFRMA_SEC_CTX]) {
859 err = security_xfrm_state_alloc(x,
860 nla_data(attrs[XFRMA_SEC_CTX]));
861 if (err)
862 goto error;
863 }
864
865 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
866 attrs[XFRMA_REPLAY_ESN_VAL])))
867 goto error;
868
869 x->km.seq = p->seq;
870 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
871 /* sysctl_xfrm_aevent_etime is in 100ms units */
872 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
873
874 if ((err = xfrm_init_replay(x, extack)))
875 goto error;
876
877 /* override default values from above */
878 xfrm_update_ae_params(x, attrs, 0);
879
880 /* configure the hardware if offload is requested */
881 if (attrs[XFRMA_OFFLOAD_DEV]) {
882 err = xfrm_dev_state_add(net, x,
883 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
884 extack);
885 if (err)
886 goto error;
887 }
888
889 return x;
890
891 error:
892 x->km.state = XFRM_STATE_DEAD;
893 xfrm_state_put(x);
894 error_no_put:
895 *errp = err;
896 return NULL;
897 }
898
899 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
900 struct nlattr **attrs, struct netlink_ext_ack *extack)
901 {
902 struct net *net = sock_net(skb->sk);
903 struct xfrm_usersa_info *p = nlmsg_data(nlh);
904 struct xfrm_state *x;
905 int err;
906 struct km_event c;
907
908 err = verify_newsa_info(p, attrs, extack);
909 if (err)
910 return err;
911
912 x = xfrm_state_construct(net, p, attrs, &err, extack);
913 if (!x)
914 return err;
915
916 xfrm_state_hold(x);
917 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
918 err = xfrm_state_add(x);
919 else
920 err = xfrm_state_update(x);
921
922 xfrm_audit_state_add(x, err ? 0 : 1, true);
923
924 if (err < 0) {
925 x->km.state = XFRM_STATE_DEAD;
926 xfrm_dev_state_delete(x);
927 __xfrm_state_put(x);
928 goto out;
929 }
930
931 if (x->km.state == XFRM_STATE_VOID)
932 x->km.state = XFRM_STATE_VALID;
933
934 c.seq = nlh->nlmsg_seq;
935 c.portid = nlh->nlmsg_pid;
936 c.event = nlh->nlmsg_type;
937
938 km_state_notify(x, &c);
939 out:
940 xfrm_state_put(x);
941 return err;
942 }
943
944 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
945 struct xfrm_usersa_id *p,
946 struct nlattr **attrs,
947 int *errp)
948 {
949 struct xfrm_state *x = NULL;
950 struct xfrm_mark m;
951 int err;
952 u32 mark = xfrm_mark_get(attrs, &m);
953
954 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
955 err = -ESRCH;
956 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
957 } else {
958 xfrm_address_t *saddr = NULL;
959
960 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
961 if (!saddr) {
962 err = -EINVAL;
963 goto out;
964 }
965
966 err = -ESRCH;
967 x = xfrm_state_lookup_byaddr(net, mark,
968 &p->daddr, saddr,
969 p->proto, p->family);
970 }
971
972 out:
973 if (!x && errp)
974 *errp = err;
975 return x;
976 }
977
978 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
979 struct nlattr **attrs, struct netlink_ext_ack *extack)
980 {
981 struct net *net = sock_net(skb->sk);
982 struct xfrm_state *x;
983 int err = -ESRCH;
984 struct km_event c;
985 struct xfrm_usersa_id *p = nlmsg_data(nlh);
986
987 x = xfrm_user_state_lookup(net, p, attrs, &err);
988 if (x == NULL)
989 return err;
990
991 if ((err = security_xfrm_state_delete(x)) != 0)
992 goto out;
993
994 if (xfrm_state_kern(x)) {
995 NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
996 err = -EPERM;
997 goto out;
998 }
999
1000 err = xfrm_state_delete(x);
1001 if (err < 0)
1002 goto out;
1003
1004 c.seq = nlh->nlmsg_seq;
1005 c.portid = nlh->nlmsg_pid;
1006 c.event = nlh->nlmsg_type;
1007 km_state_notify(x, &c);
1008
1009 out:
1010 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1011 xfrm_state_put(x);
1012 return err;
1013 }
1014
1015 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
1016 {
1017 memset(p, 0, sizeof(*p));
1018 memcpy(&p->id, &x->id, sizeof(p->id));
1019 memcpy(&p->sel, &x->sel, sizeof(p->sel));
1020 memcpy(&p->lft, &x->lft, sizeof(p->lft));
1021 if (x->xso.dev)
1022 xfrm_dev_state_update_stats(x);
1023 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
1024 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
1025 put_unaligned(x->stats.replay, &p->stats.replay);
1026 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
1027 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1028 p->mode = x->props.mode;
1029 p->replay_window = x->props.replay_window;
1030 p->reqid = x->props.reqid;
1031 p->family = x->props.family;
1032 p->flags = x->props.flags;
1033 p->seq = x->km.seq;
1034 }
1035
1036 struct xfrm_dump_info {
1037 struct sk_buff *in_skb;
1038 struct sk_buff *out_skb;
1039 u32 nlmsg_seq;
1040 u16 nlmsg_flags;
1041 };
1042
1043 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1044 {
1045 struct xfrm_user_sec_ctx *uctx;
1046 struct nlattr *attr;
1047 int ctx_size = sizeof(*uctx) + s->ctx_len;
1048
1049 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
1050 if (attr == NULL)
1051 return -EMSGSIZE;
1052
1053 uctx = nla_data(attr);
1054 uctx->exttype = XFRMA_SEC_CTX;
1055 uctx->len = ctx_size;
1056 uctx->ctx_doi = s->ctx_doi;
1057 uctx->ctx_alg = s->ctx_alg;
1058 uctx->ctx_len = s->ctx_len;
1059 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1060
1061 return 0;
1062 }
1063
1064 static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
1065 {
1066 struct xfrm_user_offload *xuo;
1067 struct nlattr *attr;
1068
1069 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
1070 if (attr == NULL)
1071 return -EMSGSIZE;
1072
1073 xuo = nla_data(attr);
1074 memset(xuo, 0, sizeof(*xuo));
1075 xuo->ifindex = xso->dev->ifindex;
1076 if (xso->dir == XFRM_DEV_OFFLOAD_IN)
1077 xuo->flags = XFRM_OFFLOAD_INBOUND;
1078 if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
1079 xuo->flags |= XFRM_OFFLOAD_PACKET;
1080
1081 return 0;
1082 }
1083
1084 static bool xfrm_redact(void)
1085 {
1086 return IS_ENABLED(CONFIG_SECURITY) &&
1087 security_locked_down(LOCKDOWN_XFRM_SECRET);
1088 }
1089
1090 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
1091 {
1092 struct xfrm_algo *algo;
1093 struct xfrm_algo_auth *ap;
1094 struct nlattr *nla;
1095 bool redact_secret = xfrm_redact();
1096
1097 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
1098 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
1099 if (!nla)
1100 return -EMSGSIZE;
1101 algo = nla_data(nla);
1102 strscpy_pad(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
1103
1104 if (redact_secret && auth->alg_key_len)
1105 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
1106 else
1107 memcpy(algo->alg_key, auth->alg_key,
1108 (auth->alg_key_len + 7) / 8);
1109 algo->alg_key_len = auth->alg_key_len;
1110
1111 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
1112 if (!nla)
1113 return -EMSGSIZE;
1114 ap = nla_data(nla);
1115 strscpy_pad(ap->alg_name, auth->alg_name, sizeof(ap->alg_name));
1116 ap->alg_key_len = auth->alg_key_len;
1117 ap->alg_trunc_len = auth->alg_trunc_len;
1118 if (redact_secret && auth->alg_key_len)
1119 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
1120 else
1121 memcpy(ap->alg_key, auth->alg_key,
1122 (auth->alg_key_len + 7) / 8);
1123 return 0;
1124 }
1125
1126 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
1127 {
1128 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
1129 struct xfrm_algo_aead *ap;
1130 bool redact_secret = xfrm_redact();
1131
1132 if (!nla)
1133 return -EMSGSIZE;
1134
1135 ap = nla_data(nla);
1136 strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name));
1137 ap->alg_key_len = aead->alg_key_len;
1138 ap->alg_icv_len = aead->alg_icv_len;
1139
1140 if (redact_secret && aead->alg_key_len)
1141 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
1142 else
1143 memcpy(ap->alg_key, aead->alg_key,
1144 (aead->alg_key_len + 7) / 8);
1145 return 0;
1146 }
1147
1148 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
1149 {
1150 struct xfrm_algo *ap;
1151 bool redact_secret = xfrm_redact();
1152 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
1153 xfrm_alg_len(ealg));
1154 if (!nla)
1155 return -EMSGSIZE;
1156
1157 ap = nla_data(nla);
1158 strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name));
1159 ap->alg_key_len = ealg->alg_key_len;
1160
1161 if (redact_secret && ealg->alg_key_len)
1162 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
1163 else
1164 memcpy(ap->alg_key, ealg->alg_key,
1165 (ealg->alg_key_len + 7) / 8);
1166
1167 return 0;
1168 }
1169
1170 static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
1171 {
1172 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
1173 struct xfrm_algo *ap;
1174
1175 if (!nla)
1176 return -EMSGSIZE;
1177
1178 ap = nla_data(nla);
1179 strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name));
1180 ap->alg_key_len = 0;
1181
1182 return 0;
1183 }
1184
1185 static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
1186 {
1187 struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
1188 struct xfrm_encap_tmpl *uep;
1189
1190 if (!nla)
1191 return -EMSGSIZE;
1192
1193 uep = nla_data(nla);
1194 memset(uep, 0, sizeof(*uep));
1195
1196 uep->encap_type = ep->encap_type;
1197 uep->encap_sport = ep->encap_sport;
1198 uep->encap_dport = ep->encap_dport;
1199 uep->encap_oa = ep->encap_oa;
1200
1201 return 0;
1202 }
1203
1204 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
1205 {
1206 int ret = 0;
1207
1208 if (m->v | m->m) {
1209 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
1210 if (!ret)
1211 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
1212 }
1213 return ret;
1214 }
1215
1216 /* Don't change this without updating xfrm_sa_len! */
1217 static int copy_to_user_state_extra(struct xfrm_state *x,
1218 struct xfrm_usersa_info *p,
1219 struct sk_buff *skb)
1220 {
1221 int ret = 0;
1222
1223 copy_to_user_state(x, p);
1224
1225 if (x->props.extra_flags) {
1226 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
1227 x->props.extra_flags);
1228 if (ret)
1229 goto out;
1230 }
1231
1232 if (x->coaddr) {
1233 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
1234 if (ret)
1235 goto out;
1236 }
1237 if (x->lastused) {
1238 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
1239 XFRMA_PAD);
1240 if (ret)
1241 goto out;
1242 }
1243 if (x->aead) {
1244 ret = copy_to_user_aead(x->aead, skb);
1245 if (ret)
1246 goto out;
1247 }
1248 if (x->aalg) {
1249 ret = copy_to_user_auth(x->aalg, skb);
1250 if (ret)
1251 goto out;
1252 }
1253 if (x->ealg) {
1254 ret = copy_to_user_ealg(x->ealg, skb);
1255 if (ret)
1256 goto out;
1257 }
1258 if (x->calg) {
1259 ret = copy_to_user_calg(x->calg, skb);
1260 if (ret)
1261 goto out;
1262 }
1263 if (x->encap) {
1264 ret = copy_to_user_encap(x->encap, skb);
1265 if (ret)
1266 goto out;
1267 }
1268 if (x->tfcpad) {
1269 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1270 if (ret)
1271 goto out;
1272 }
1273 ret = xfrm_mark_put(skb, &x->mark);
1274 if (ret)
1275 goto out;
1276
1277 ret = xfrm_smark_put(skb, &x->props.smark);
1278 if (ret)
1279 goto out;
1280
1281 if (x->replay_esn)
1282 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1283 xfrm_replay_state_esn_len(x->replay_esn),
1284 x->replay_esn);
1285 else
1286 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1287 &x->replay);
1288 if (ret)
1289 goto out;
1290 if(x->xso.dev)
1291 ret = copy_user_offload(&x->xso, skb);
1292 if (ret)
1293 goto out;
1294 if (x->if_id) {
1295 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1296 if (ret)
1297 goto out;
1298 }
1299 if (x->security) {
1300 ret = copy_sec_ctx(x->security, skb);
1301 if (ret)
1302 goto out;
1303 }
1304 if (x->mapping_maxage) {
1305 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1306 if (ret)
1307 goto out;
1308 }
1309 if (x->pcpu_num != UINT_MAX) {
1310 ret = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
1311 if (ret)
1312 goto out;
1313 }
1314 if (x->dir)
1315 ret = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
1316
1317 if (x->nat_keepalive_interval) {
1318 ret = nla_put_u32(skb, XFRMA_NAT_KEEPALIVE_INTERVAL,
1319 x->nat_keepalive_interval);
1320 if (ret)
1321 goto out;
1322 }
1323 out:
1324 return ret;
1325 }
1326
1327 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1328 {
1329 struct xfrm_dump_info *sp = ptr;
1330 struct sk_buff *in_skb = sp->in_skb;
1331 struct sk_buff *skb = sp->out_skb;
1332 struct xfrm_translator *xtr;
1333 struct xfrm_usersa_info *p;
1334 struct nlmsghdr *nlh;
1335 int err;
1336
1337 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1338 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1339 if (nlh == NULL)
1340 return -EMSGSIZE;
1341
1342 p = nlmsg_data(nlh);
1343
1344 err = copy_to_user_state_extra(x, p, skb);
1345 if (err) {
1346 nlmsg_cancel(skb, nlh);
1347 return err;
1348 }
1349 nlmsg_end(skb, nlh);
1350
1351 xtr = xfrm_get_translator();
1352 if (xtr) {
1353 err = xtr->alloc_compat(skb, nlh);
1354
1355 xfrm_put_translator(xtr);
1356 if (err) {
1357 nlmsg_cancel(skb, nlh);
1358 return err;
1359 }
1360 }
1361
1362 return 0;
1363 }
1364
1365 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1366 {
1367 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1368 struct sock *sk = cb->skb->sk;
1369 struct net *net = sock_net(sk);
1370
1371 if (cb->args[0])
1372 xfrm_state_walk_done(walk, net);
1373 return 0;
1374 }
1375
1376 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1377 {
1378 struct net *net = sock_net(skb->sk);
1379 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1380 struct xfrm_dump_info info;
1381
1382 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1383 sizeof(cb->args) - sizeof(cb->args[0]));
1384
1385 info.in_skb = cb->skb;
1386 info.out_skb = skb;
1387 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1388 info.nlmsg_flags = NLM_F_MULTI;
1389
1390 if (!cb->args[0]) {
1391 struct nlattr *attrs[XFRMA_MAX+1];
1392 struct xfrm_address_filter *filter = NULL;
1393 u8 proto = 0;
1394 int err;
1395
1396 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1397 xfrma_policy, cb->extack);
1398 if (err < 0)
1399 return err;
1400
1401 if (attrs[XFRMA_ADDRESS_FILTER]) {
1402 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1403 sizeof(*filter), GFP_KERNEL);
1404 if (filter == NULL)
1405 return -ENOMEM;
1406
1407 /* see addr_match(), (prefix length >> 5) << 2
1408 * will be used to compare xfrm_address_t
1409 */
1410 if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1411 filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1412 kfree(filter);
1413 return -EINVAL;
1414 }
1415 }
1416
1417 if (attrs[XFRMA_PROTO])
1418 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1419
1420 xfrm_state_walk_init(walk, proto, filter);
1421 cb->args[0] = 1;
1422 }
1423
1424 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1425
1426 return skb->len;
1427 }
1428
1429 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1430 struct xfrm_state *x, u32 seq)
1431 {
1432 struct xfrm_dump_info info;
1433 struct sk_buff *skb;
1434 int err;
1435
1436 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1437 if (!skb)
1438 return ERR_PTR(-ENOMEM);
1439
1440 info.in_skb = in_skb;
1441 info.out_skb = skb;
1442 info.nlmsg_seq = seq;
1443 info.nlmsg_flags = 0;
1444
1445 err = dump_one_state(x, 0, &info);
1446 if (err) {
1447 kfree_skb(skb);
1448 return ERR_PTR(err);
1449 }
1450
1451 return skb;
1452 }
1453
1454 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1455 * Must be called with RCU read lock.
1456 */
1457 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1458 u32 pid, unsigned int group)
1459 {
1460 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1461 struct xfrm_translator *xtr;
1462
1463 if (!nlsk) {
1464 kfree_skb(skb);
1465 return -EPIPE;
1466 }
1467
1468 xtr = xfrm_get_translator();
1469 if (xtr) {
1470 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1471
1472 xfrm_put_translator(xtr);
1473 if (err) {
1474 kfree_skb(skb);
1475 return err;
1476 }
1477 }
1478
1479 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1480 }
1481
1482 static inline unsigned int xfrm_spdinfo_msgsize(void)
1483 {
1484 return NLMSG_ALIGN(4)
1485 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1486 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1487 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1488 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1489 }
1490
1491 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1492 u32 portid, u32 seq, u32 flags)
1493 {
1494 struct xfrmk_spdinfo si;
1495 struct xfrmu_spdinfo spc;
1496 struct xfrmu_spdhinfo sph;
1497 struct xfrmu_spdhthresh spt4, spt6;
1498 struct nlmsghdr *nlh;
1499 int err;
1500 u32 *f;
1501 unsigned lseq;
1502
1503 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1504 if (nlh == NULL) /* shouldn't really happen ... */
1505 return -EMSGSIZE;
1506
1507 f = nlmsg_data(nlh);
1508 *f = flags;
1509 xfrm_spd_getinfo(net, &si);
1510 spc.incnt = si.incnt;
1511 spc.outcnt = si.outcnt;
1512 spc.fwdcnt = si.fwdcnt;
1513 spc.inscnt = si.inscnt;
1514 spc.outscnt = si.outscnt;
1515 spc.fwdscnt = si.fwdscnt;
1516 sph.spdhcnt = si.spdhcnt;
1517 sph.spdhmcnt = si.spdhmcnt;
1518
1519 do {
1520 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1521
1522 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1523 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1524 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1525 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1526 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1527
1528 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1529 if (!err)
1530 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1531 if (!err)
1532 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1533 if (!err)
1534 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1535 if (err) {
1536 nlmsg_cancel(skb, nlh);
1537 return err;
1538 }
1539
1540 nlmsg_end(skb, nlh);
1541 return 0;
1542 }
1543
1544 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1545 struct nlattr **attrs,
1546 struct netlink_ext_ack *extack)
1547 {
1548 struct net *net = sock_net(skb->sk);
1549 struct xfrmu_spdhthresh *thresh4 = NULL;
1550 struct xfrmu_spdhthresh *thresh6 = NULL;
1551
1552 /* selector prefixlen thresholds to hash policies */
1553 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1554 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1555
1556 if (nla_len(rta) < sizeof(*thresh4)) {
1557 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
1558 return -EINVAL;
1559 }
1560 thresh4 = nla_data(rta);
1561 if (thresh4->lbits > 32 || thresh4->rbits > 32) {
1562 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
1563 return -EINVAL;
1564 }
1565 }
1566 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1567 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1568
1569 if (nla_len(rta) < sizeof(*thresh6)) {
1570 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
1571 return -EINVAL;
1572 }
1573 thresh6 = nla_data(rta);
1574 if (thresh6->lbits > 128 || thresh6->rbits > 128) {
1575 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
1576 return -EINVAL;
1577 }
1578 }
1579
1580 if (thresh4 || thresh6) {
1581 write_seqlock(&net->xfrm.policy_hthresh.lock);
1582 if (thresh4) {
1583 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1584 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1585 }
1586 if (thresh6) {
1587 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1588 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1589 }
1590 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1591
1592 xfrm_policy_hash_rebuild(net);
1593 }
1594
1595 return 0;
1596 }
1597
1598 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1599 struct nlattr **attrs,
1600 struct netlink_ext_ack *extack)
1601 {
1602 struct net *net = sock_net(skb->sk);
1603 struct sk_buff *r_skb;
1604 u32 *flags = nlmsg_data(nlh);
1605 u32 sportid = NETLINK_CB(skb).portid;
1606 u32 seq = nlh->nlmsg_seq;
1607 int err;
1608
1609 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1610 if (r_skb == NULL)
1611 return -ENOMEM;
1612
1613 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1614 BUG_ON(err < 0);
1615
1616 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1617 }
1618
1619 static inline unsigned int xfrm_sadinfo_msgsize(void)
1620 {
1621 return NLMSG_ALIGN(4)
1622 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1623 + nla_total_size(4); /* XFRMA_SAD_CNT */
1624 }
1625
1626 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1627 u32 portid, u32 seq, u32 flags)
1628 {
1629 struct xfrmk_sadinfo si;
1630 struct xfrmu_sadhinfo sh;
1631 struct nlmsghdr *nlh;
1632 int err;
1633 u32 *f;
1634
1635 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1636 if (nlh == NULL) /* shouldn't really happen ... */
1637 return -EMSGSIZE;
1638
1639 f = nlmsg_data(nlh);
1640 *f = flags;
1641 xfrm_sad_getinfo(net, &si);
1642
1643 sh.sadhmcnt = si.sadhmcnt;
1644 sh.sadhcnt = si.sadhcnt;
1645
1646 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1647 if (!err)
1648 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1649 if (err) {
1650 nlmsg_cancel(skb, nlh);
1651 return err;
1652 }
1653
1654 nlmsg_end(skb, nlh);
1655 return 0;
1656 }
1657
1658 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1659 struct nlattr **attrs,
1660 struct netlink_ext_ack *extack)
1661 {
1662 struct net *net = sock_net(skb->sk);
1663 struct sk_buff *r_skb;
1664 u32 *flags = nlmsg_data(nlh);
1665 u32 sportid = NETLINK_CB(skb).portid;
1666 u32 seq = nlh->nlmsg_seq;
1667 int err;
1668
1669 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1670 if (r_skb == NULL)
1671 return -ENOMEM;
1672
1673 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1674 BUG_ON(err < 0);
1675
1676 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1677 }
1678
1679 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1680 struct nlattr **attrs, struct netlink_ext_ack *extack)
1681 {
1682 struct net *net = sock_net(skb->sk);
1683 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1684 struct xfrm_state *x;
1685 struct sk_buff *resp_skb;
1686 int err = -ESRCH;
1687
1688 x = xfrm_user_state_lookup(net, p, attrs, &err);
1689 if (x == NULL)
1690 goto out_noput;
1691
1692 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1693 if (IS_ERR(resp_skb)) {
1694 err = PTR_ERR(resp_skb);
1695 } else {
1696 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1697 }
1698 xfrm_state_put(x);
1699 out_noput:
1700 return err;
1701 }
1702
1703 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1704 struct nlattr **attrs,
1705 struct netlink_ext_ack *extack)
1706 {
1707 struct net *net = sock_net(skb->sk);
1708 struct xfrm_state *x;
1709 struct xfrm_userspi_info *p;
1710 struct xfrm_translator *xtr;
1711 struct sk_buff *resp_skb;
1712 xfrm_address_t *daddr;
1713 int family;
1714 int err;
1715 u32 mark;
1716 struct xfrm_mark m;
1717 u32 if_id = 0;
1718 u32 pcpu_num = UINT_MAX;
1719
1720 p = nlmsg_data(nlh);
1721 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
1722 if (err)
1723 goto out_noput;
1724
1725 family = p->info.family;
1726 daddr = &p->info.id.daddr;
1727
1728 x = NULL;
1729
1730 mark = xfrm_mark_get(attrs, &m);
1731
1732 if (attrs[XFRMA_IF_ID])
1733 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1734
1735 if (attrs[XFRMA_SA_PCPU]) {
1736 pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
1737 if (pcpu_num >= num_possible_cpus()) {
1738 err = -EINVAL;
1739 goto out_noput;
1740 }
1741 }
1742
1743 if (p->info.seq) {
1744 x = xfrm_find_acq_byseq(net, mark, p->info.seq, pcpu_num);
1745 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1746 xfrm_state_put(x);
1747 x = NULL;
1748 }
1749 }
1750
1751 if (!x)
1752 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1753 if_id, pcpu_num, p->info.id.proto, daddr,
1754 &p->info.saddr, 1,
1755 family);
1756 err = -ENOENT;
1757 if (!x) {
1758 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
1759 goto out_noput;
1760 }
1761
1762 err = xfrm_alloc_spi(x, p->min, p->max, extack);
1763 if (err)
1764 goto out;
1765
1766 if (attrs[XFRMA_SA_DIR])
1767 x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]);
1768
1769 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1770 if (IS_ERR(resp_skb)) {
1771 err = PTR_ERR(resp_skb);
1772 goto out;
1773 }
1774
1775 xtr = xfrm_get_translator();
1776 if (xtr) {
1777 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1778
1779 xfrm_put_translator(xtr);
1780 if (err) {
1781 kfree_skb(resp_skb);
1782 goto out;
1783 }
1784 }
1785
1786 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1787
1788 out:
1789 xfrm_state_put(x);
1790 out_noput:
1791 return err;
1792 }
1793
1794 static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
1795 {
1796 switch (dir) {
1797 case XFRM_POLICY_IN:
1798 case XFRM_POLICY_OUT:
1799 case XFRM_POLICY_FWD:
1800 break;
1801
1802 default:
1803 NL_SET_ERR_MSG(extack, "Invalid policy direction");
1804 return -EINVAL;
1805 }
1806
1807 return 0;
1808 }
1809
1810 static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
1811 {
1812 switch (type) {
1813 case XFRM_POLICY_TYPE_MAIN:
1814 #ifdef CONFIG_XFRM_SUB_POLICY
1815 case XFRM_POLICY_TYPE_SUB:
1816 #endif
1817 break;
1818
1819 default:
1820 NL_SET_ERR_MSG(extack, "Invalid policy type");
1821 return -EINVAL;
1822 }
1823
1824 return 0;
1825 }
1826
1827 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
1828 struct netlink_ext_ack *extack)
1829 {
1830 int ret;
1831
1832 switch (p->share) {
1833 case XFRM_SHARE_ANY:
1834 case XFRM_SHARE_SESSION:
1835 case XFRM_SHARE_USER:
1836 case XFRM_SHARE_UNIQUE:
1837 break;
1838
1839 default:
1840 NL_SET_ERR_MSG(extack, "Invalid policy share");
1841 return -EINVAL;
1842 }
1843
1844 switch (p->action) {
1845 case XFRM_POLICY_ALLOW:
1846 case XFRM_POLICY_BLOCK:
1847 break;
1848
1849 default:
1850 NL_SET_ERR_MSG(extack, "Invalid policy action");
1851 return -EINVAL;
1852 }
1853
1854 switch (p->sel.family) {
1855 case AF_INET:
1856 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
1857 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
1858 return -EINVAL;
1859 }
1860
1861 break;
1862
1863 case AF_INET6:
1864 #if IS_ENABLED(CONFIG_IPV6)
1865 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
1866 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
1867 return -EINVAL;
1868 }
1869
1870 break;
1871 #else
1872 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
1873 return -EAFNOSUPPORT;
1874 #endif
1875
1876 default:
1877 NL_SET_ERR_MSG(extack, "Invalid selector family");
1878 return -EINVAL;
1879 }
1880
1881 ret = verify_policy_dir(p->dir, extack);
1882 if (ret)
1883 return ret;
1884 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
1885 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
1886 return -EINVAL;
1887 }
1888
1889 return 0;
1890 }
1891
1892 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1893 {
1894 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1895 struct xfrm_user_sec_ctx *uctx;
1896
1897 if (!rt)
1898 return 0;
1899
1900 uctx = nla_data(rt);
1901 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1902 }
1903
1904 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1905 int nr)
1906 {
1907 int i;
1908
1909 xp->xfrm_nr = nr;
1910 for (i = 0; i < nr; i++, ut++) {
1911 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1912
1913 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1914 memcpy(&t->saddr, &ut->saddr,
1915 sizeof(xfrm_address_t));
1916 t->reqid = ut->reqid;
1917 t->mode = ut->mode;
1918 t->share = ut->share;
1919 t->optional = ut->optional;
1920 t->aalgos = ut->aalgos;
1921 t->ealgos = ut->ealgos;
1922 t->calgos = ut->calgos;
1923 /* If all masks are ~0, then we allow all algorithms. */
1924 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1925 t->encap_family = ut->family;
1926 }
1927 }
1928
1929 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,
1930 int dir, struct netlink_ext_ack *extack)
1931 {
1932 u16 prev_family;
1933 int i;
1934
1935 if (nr > XFRM_MAX_DEPTH) {
1936 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
1937 return -EINVAL;
1938 }
1939
1940 prev_family = family;
1941
1942 for (i = 0; i < nr; i++) {
1943 /* We never validated the ut->family value, so many
1944 * applications simply leave it at zero. The check was
1945 * never made and ut->family was ignored because all
1946 * templates could be assumed to have the same family as
1947 * the policy itself. Now that we will have ipv4-in-ipv6
1948 * and ipv6-in-ipv4 tunnels, this is no longer true.
1949 */
1950 if (!ut[i].family)
1951 ut[i].family = family;
1952
1953 switch (ut[i].mode) {
1954 case XFRM_MODE_TUNNEL:
1955 case XFRM_MODE_BEET:
1956 if (ut[i].optional && dir == XFRM_POLICY_OUT) {
1957 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
1958 return -EINVAL;
1959 }
1960 break;
1961 default:
1962 if (ut[i].family != prev_family) {
1963 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
1964 return -EINVAL;
1965 }
1966 break;
1967 }
1968 if (ut[i].mode >= XFRM_MODE_MAX) {
1969 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
1970 return -EINVAL;
1971 }
1972
1973 prev_family = ut[i].family;
1974
1975 switch (ut[i].family) {
1976 case AF_INET:
1977 break;
1978 #if IS_ENABLED(CONFIG_IPV6)
1979 case AF_INET6:
1980 break;
1981 #endif
1982 default:
1983 NL_SET_ERR_MSG(extack, "Invalid family in template");
1984 return -EINVAL;
1985 }
1986
1987 if (!xfrm_id_proto_valid(ut[i].id.proto)) {
1988 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
1989 return -EINVAL;
1990 }
1991 }
1992
1993 return 0;
1994 }
1995
1996 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
1997 int dir, struct netlink_ext_ack *extack)
1998 {
1999 struct nlattr *rt = attrs[XFRMA_TMPL];
2000
2001 if (!rt) {
2002 pol->xfrm_nr = 0;
2003 } else {
2004 struct xfrm_user_tmpl *utmpl = nla_data(rt);
2005 int nr = nla_len(rt) / sizeof(*utmpl);
2006 int err;
2007
2008 err = validate_tmpl(nr, utmpl, pol->family, dir, extack);
2009 if (err)
2010 return err;
2011
2012 copy_templates(pol, utmpl, nr);
2013 }
2014 return 0;
2015 }
2016
2017 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
2018 struct netlink_ext_ack *extack)
2019 {
2020 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
2021 struct xfrm_userpolicy_type *upt;
2022 u8 type = XFRM_POLICY_TYPE_MAIN;
2023 int err;
2024
2025 if (rt) {
2026 upt = nla_data(rt);
2027 type = upt->type;
2028 }
2029
2030 err = verify_policy_type(type, extack);
2031 if (err)
2032 return err;
2033
2034 *tp = type;
2035 return 0;
2036 }
2037
2038 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
2039 {
2040 xp->priority = p->priority;
2041 xp->index = p->index;
2042 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
2043 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
2044 xp->action = p->action;
2045 xp->flags = p->flags;
2046 xp->family = p->sel.family;
2047 /* XXX xp->share = p->share; */
2048 }
2049
2050 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
2051 {
2052 memset(p, 0, sizeof(*p));
2053 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
2054 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
2055 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
2056 p->priority = xp->priority;
2057 p->index = xp->index;
2058 p->sel.family = xp->family;
2059 p->dir = dir;
2060 p->action = xp->action;
2061 p->flags = xp->flags;
2062 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
2063 }
2064
2065 static struct xfrm_policy *xfrm_policy_construct(struct net *net,
2066 struct xfrm_userpolicy_info *p,
2067 struct nlattr **attrs,
2068 int *errp,
2069 struct netlink_ext_ack *extack)
2070 {
2071 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
2072 int err;
2073
2074 if (!xp) {
2075 *errp = -ENOMEM;
2076 return NULL;
2077 }
2078
2079 copy_from_user_policy(xp, p);
2080
2081 err = copy_from_user_policy_type(&xp->type, attrs, extack);
2082 if (err)
2083 goto error;
2084
2085 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
2086 err = copy_from_user_sec_ctx(xp, attrs);
2087 if (err)
2088 goto error;
2089
2090 xfrm_mark_get(attrs, &xp->mark);
2091
2092 if (attrs[XFRMA_IF_ID])
2093 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2094
2095 /* configure the hardware if offload is requested */
2096 if (attrs[XFRMA_OFFLOAD_DEV]) {
2097 err = xfrm_dev_policy_add(net, xp,
2098 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
2099 p->dir, extack);
2100 if (err)
2101 goto error;
2102 }
2103
2104 return xp;
2105 error:
2106 *errp = err;
2107 xp->walk.dead = 1;
2108 xfrm_policy_destroy(xp);
2109 return NULL;
2110 }
2111
2112 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2113 struct nlattr **attrs,
2114 struct netlink_ext_ack *extack)
2115 {
2116 struct net *net = sock_net(skb->sk);
2117 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
2118 struct xfrm_policy *xp;
2119 struct km_event c;
2120 int err;
2121 int excl;
2122
2123 err = verify_newpolicy_info(p, extack);
2124 if (err)
2125 return err;
2126 err = verify_sec_ctx_len(attrs, extack);
2127 if (err)
2128 return err;
2129
2130 xp = xfrm_policy_construct(net, p, attrs, &err, extack);
2131 if (!xp)
2132 return err;
2133
2134 /* shouldn't excl be based on nlh flags??
2135 * Aha! this is anti-netlink really i.e more pfkey derived
2136 * in netlink excl is a flag and you wouldn't need
2137 * a type XFRM_MSG_UPDPOLICY - JHS */
2138 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
2139 err = xfrm_policy_insert(p->dir, xp, excl);
2140 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2141
2142 if (err) {
2143 xfrm_dev_policy_delete(xp);
2144 xfrm_dev_policy_free(xp);
2145 security_xfrm_policy_free(xp->security);
2146 kfree(xp);
2147 return err;
2148 }
2149
2150 c.event = nlh->nlmsg_type;
2151 c.seq = nlh->nlmsg_seq;
2152 c.portid = nlh->nlmsg_pid;
2153 km_policy_notify(xp, p->dir, &c);
2154
2155 xfrm_pol_put(xp);
2156
2157 return 0;
2158 }
2159
2160 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
2161 {
2162 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
2163 int i;
2164
2165 if (xp->xfrm_nr == 0)
2166 return 0;
2167
2168 if (xp->xfrm_nr > XFRM_MAX_DEPTH)
2169 return -ENOBUFS;
2170
2171 for (i = 0; i < xp->xfrm_nr; i++) {
2172 struct xfrm_user_tmpl *up = &vec[i];
2173 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
2174
2175 memset(up, 0, sizeof(*up));
2176 memcpy(&up->id, &kp->id, sizeof(up->id));
2177 up->family = kp->encap_family;
2178 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
2179 up->reqid = kp->reqid;
2180 up->mode = kp->mode;
2181 up->share = kp->share;
2182 up->optional = kp->optional;
2183 up->aalgos = kp->aalgos;
2184 up->ealgos = kp->ealgos;
2185 up->calgos = kp->calgos;
2186 }
2187
2188 return nla_put(skb, XFRMA_TMPL,
2189 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
2190 }
2191
2192 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
2193 {
2194 if (x->security) {
2195 return copy_sec_ctx(x->security, skb);
2196 }
2197 return 0;
2198 }
2199
2200 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
2201 {
2202 if (xp->security)
2203 return copy_sec_ctx(xp->security, skb);
2204 return 0;
2205 }
2206 static inline unsigned int userpolicy_type_attrsize(void)
2207 {
2208 #ifdef CONFIG_XFRM_SUB_POLICY
2209 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
2210 #else
2211 return 0;
2212 #endif
2213 }
2214
2215 #ifdef CONFIG_XFRM_SUB_POLICY
2216 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2217 {
2218 struct xfrm_userpolicy_type upt;
2219
2220 /* Sadly there are two holes in struct xfrm_userpolicy_type */
2221 memset(&upt, 0, sizeof(upt));
2222 upt.type = type;
2223
2224 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2225 }
2226
2227 #else
2228 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2229 {
2230 return 0;
2231 }
2232 #endif
2233
2234 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
2235 {
2236 struct xfrm_dump_info *sp = ptr;
2237 struct xfrm_userpolicy_info *p;
2238 struct sk_buff *in_skb = sp->in_skb;
2239 struct sk_buff *skb = sp->out_skb;
2240 struct xfrm_translator *xtr;
2241 struct nlmsghdr *nlh;
2242 int err;
2243
2244 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
2245 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
2246 if (nlh == NULL)
2247 return -EMSGSIZE;
2248
2249 p = nlmsg_data(nlh);
2250 copy_to_user_policy(xp, p, dir);
2251 err = copy_to_user_tmpl(xp, skb);
2252 if (!err)
2253 err = copy_to_user_sec_ctx(xp, skb);
2254 if (!err)
2255 err = copy_to_user_policy_type(xp->type, skb);
2256 if (!err)
2257 err = xfrm_mark_put(skb, &xp->mark);
2258 if (!err)
2259 err = xfrm_if_id_put(skb, xp->if_id);
2260 if (!err && xp->xdo.dev)
2261 err = copy_user_offload(&xp->xdo, skb);
2262 if (err) {
2263 nlmsg_cancel(skb, nlh);
2264 return err;
2265 }
2266 nlmsg_end(skb, nlh);
2267
2268 xtr = xfrm_get_translator();
2269 if (xtr) {
2270 err = xtr->alloc_compat(skb, nlh);
2271
2272 xfrm_put_translator(xtr);
2273 if (err) {
2274 nlmsg_cancel(skb, nlh);
2275 return err;
2276 }
2277 }
2278
2279 return 0;
2280 }
2281
2282 static int xfrm_dump_policy_done(struct netlink_callback *cb)
2283 {
2284 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2285 struct net *net = sock_net(cb->skb->sk);
2286
2287 xfrm_policy_walk_done(walk, net);
2288 return 0;
2289 }
2290
2291 static int xfrm_dump_policy_start(struct netlink_callback *cb)
2292 {
2293 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2294
2295 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
2296
2297 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
2298 return 0;
2299 }
2300
2301 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
2302 {
2303 struct net *net = sock_net(skb->sk);
2304 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2305 struct xfrm_dump_info info;
2306
2307 info.in_skb = cb->skb;
2308 info.out_skb = skb;
2309 info.nlmsg_seq = cb->nlh->nlmsg_seq;
2310 info.nlmsg_flags = NLM_F_MULTI;
2311
2312 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
2313
2314 return skb->len;
2315 }
2316
2317 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
2318 struct xfrm_policy *xp,
2319 int dir, u32 seq)
2320 {
2321 struct xfrm_dump_info info;
2322 struct sk_buff *skb;
2323 int err;
2324
2325 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2326 if (!skb)
2327 return ERR_PTR(-ENOMEM);
2328
2329 info.in_skb = in_skb;
2330 info.out_skb = skb;
2331 info.nlmsg_seq = seq;
2332 info.nlmsg_flags = 0;
2333
2334 err = dump_one_policy(xp, dir, 0, &info);
2335 if (err) {
2336 kfree_skb(skb);
2337 return ERR_PTR(err);
2338 }
2339
2340 return skb;
2341 }
2342
2343 static int xfrm_notify_userpolicy(struct net *net)
2344 {
2345 struct xfrm_userpolicy_default *up;
2346 int len = NLMSG_ALIGN(sizeof(*up));
2347 struct nlmsghdr *nlh;
2348 struct sk_buff *skb;
2349 int err;
2350
2351 skb = nlmsg_new(len, GFP_ATOMIC);
2352 if (skb == NULL)
2353 return -ENOMEM;
2354
2355 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
2356 if (nlh == NULL) {
2357 kfree_skb(skb);
2358 return -EMSGSIZE;
2359 }
2360
2361 up = nlmsg_data(nlh);
2362 up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2363 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2364 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2365
2366 nlmsg_end(skb, nlh);
2367
2368 rcu_read_lock();
2369 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2370 rcu_read_unlock();
2371
2372 return err;
2373 }
2374
2375 static bool xfrm_userpolicy_is_valid(__u8 policy)
2376 {
2377 return policy == XFRM_USERPOLICY_BLOCK ||
2378 policy == XFRM_USERPOLICY_ACCEPT;
2379 }
2380
2381 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2382 struct nlattr **attrs, struct netlink_ext_ack *extack)
2383 {
2384 struct net *net = sock_net(skb->sk);
2385 struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2386
2387 if (xfrm_userpolicy_is_valid(up->in))
2388 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2389
2390 if (xfrm_userpolicy_is_valid(up->fwd))
2391 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2392
2393 if (xfrm_userpolicy_is_valid(up->out))
2394 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2395
2396 rt_genid_bump_all(net);
2397
2398 xfrm_notify_userpolicy(net);
2399 return 0;
2400 }
2401
2402 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2403 struct nlattr **attrs, struct netlink_ext_ack *extack)
2404 {
2405 struct sk_buff *r_skb;
2406 struct nlmsghdr *r_nlh;
2407 struct net *net = sock_net(skb->sk);
2408 struct xfrm_userpolicy_default *r_up;
2409 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2410 u32 portid = NETLINK_CB(skb).portid;
2411 u32 seq = nlh->nlmsg_seq;
2412
2413 r_skb = nlmsg_new(len, GFP_ATOMIC);
2414 if (!r_skb)
2415 return -ENOMEM;
2416
2417 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2418 if (!r_nlh) {
2419 kfree_skb(r_skb);
2420 return -EMSGSIZE;
2421 }
2422
2423 r_up = nlmsg_data(r_nlh);
2424 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2425 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2426 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2427 nlmsg_end(r_skb, r_nlh);
2428
2429 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2430 }
2431
2432 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2433 struct nlattr **attrs,
2434 struct netlink_ext_ack *extack)
2435 {
2436 struct net *net = sock_net(skb->sk);
2437 struct xfrm_policy *xp;
2438 struct xfrm_userpolicy_id *p;
2439 u8 type = XFRM_POLICY_TYPE_MAIN;
2440 int err;
2441 struct km_event c;
2442 int delete;
2443 struct xfrm_mark m;
2444 u32 if_id = 0;
2445
2446 p = nlmsg_data(nlh);
2447 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2448
2449 err = copy_from_user_policy_type(&type, attrs, extack);
2450 if (err)
2451 return err;
2452
2453 err = verify_policy_dir(p->dir, extack);
2454 if (err)
2455 return err;
2456
2457 if (attrs[XFRMA_IF_ID])
2458 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2459
2460 xfrm_mark_get(attrs, &m);
2461
2462 if (p->index)
2463 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2464 p->index, delete, &err);
2465 else {
2466 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2467 struct xfrm_sec_ctx *ctx;
2468
2469 err = verify_sec_ctx_len(attrs, extack);
2470 if (err)
2471 return err;
2472
2473 ctx = NULL;
2474 if (rt) {
2475 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2476
2477 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2478 if (err)
2479 return err;
2480 }
2481 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2482 &p->sel, ctx, delete, &err);
2483 security_xfrm_policy_free(ctx);
2484 }
2485 if (xp == NULL)
2486 return -ENOENT;
2487
2488 if (!delete) {
2489 struct sk_buff *resp_skb;
2490
2491 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2492 if (IS_ERR(resp_skb)) {
2493 err = PTR_ERR(resp_skb);
2494 } else {
2495 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2496 NETLINK_CB(skb).portid);
2497 }
2498 } else {
2499 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2500
2501 if (err != 0)
2502 goto out;
2503
2504 c.data.byid = p->index;
2505 c.event = nlh->nlmsg_type;
2506 c.seq = nlh->nlmsg_seq;
2507 c.portid = nlh->nlmsg_pid;
2508 km_policy_notify(xp, p->dir, &c);
2509 }
2510
2511 out:
2512 xfrm_pol_put(xp);
2513 return err;
2514 }
2515
2516 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2517 struct nlattr **attrs,
2518 struct netlink_ext_ack *extack)
2519 {
2520 struct net *net = sock_net(skb->sk);
2521 struct km_event c;
2522 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2523 int err;
2524
2525 err = xfrm_state_flush(net, p->proto, true, false);
2526 if (err) {
2527 if (err == -ESRCH) /* empty table */
2528 return 0;
2529 return err;
2530 }
2531 c.data.proto = p->proto;
2532 c.event = nlh->nlmsg_type;
2533 c.seq = nlh->nlmsg_seq;
2534 c.portid = nlh->nlmsg_pid;
2535 c.net = net;
2536 km_state_notify(NULL, &c);
2537
2538 return 0;
2539 }
2540
2541 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2542 {
2543 unsigned int replay_size = x->replay_esn ?
2544 xfrm_replay_state_esn_len(x->replay_esn) :
2545 sizeof(struct xfrm_replay_state);
2546
2547 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2548 + nla_total_size(replay_size)
2549 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2550 + nla_total_size(sizeof(struct xfrm_mark))
2551 + nla_total_size(4) /* XFRM_AE_RTHR */
2552 + nla_total_size(4) /* XFRM_AE_ETHR */
2553 + nla_total_size(sizeof(x->dir)) /* XFRMA_SA_DIR */
2554 + nla_total_size(4); /* XFRMA_SA_PCPU */
2555 }
2556
2557 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2558 {
2559 struct xfrm_aevent_id *id;
2560 struct nlmsghdr *nlh;
2561 int err;
2562
2563 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2564 if (nlh == NULL)
2565 return -EMSGSIZE;
2566
2567 id = nlmsg_data(nlh);
2568 memset(&id->sa_id, 0, sizeof(id->sa_id));
2569 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2570 id->sa_id.spi = x->id.spi;
2571 id->sa_id.family = x->props.family;
2572 id->sa_id.proto = x->id.proto;
2573 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2574 id->reqid = x->props.reqid;
2575 id->flags = c->data.aevent;
2576
2577 if (x->replay_esn) {
2578 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2579 xfrm_replay_state_esn_len(x->replay_esn),
2580 x->replay_esn);
2581 } else {
2582 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2583 &x->replay);
2584 }
2585 if (err)
2586 goto out_cancel;
2587 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2588 XFRMA_PAD);
2589 if (err)
2590 goto out_cancel;
2591
2592 if (id->flags & XFRM_AE_RTHR) {
2593 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2594 if (err)
2595 goto out_cancel;
2596 }
2597 if (id->flags & XFRM_AE_ETHR) {
2598 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2599 x->replay_maxage * 10 / HZ);
2600 if (err)
2601 goto out_cancel;
2602 }
2603 err = xfrm_mark_put(skb, &x->mark);
2604 if (err)
2605 goto out_cancel;
2606
2607 err = xfrm_if_id_put(skb, x->if_id);
2608 if (err)
2609 goto out_cancel;
2610 if (x->pcpu_num != UINT_MAX) {
2611 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
2612 if (err)
2613 goto out_cancel;
2614 }
2615
2616 if (x->dir) {
2617 err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
2618 if (err)
2619 goto out_cancel;
2620 }
2621
2622 nlmsg_end(skb, nlh);
2623 return 0;
2624
2625 out_cancel:
2626 nlmsg_cancel(skb, nlh);
2627 return err;
2628 }
2629
2630 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2631 struct nlattr **attrs, struct netlink_ext_ack *extack)
2632 {
2633 struct net *net = sock_net(skb->sk);
2634 struct xfrm_state *x;
2635 struct sk_buff *r_skb;
2636 int err;
2637 struct km_event c;
2638 u32 mark;
2639 struct xfrm_mark m;
2640 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2641 struct xfrm_usersa_id *id = &p->sa_id;
2642
2643 mark = xfrm_mark_get(attrs, &m);
2644
2645 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2646 if (x == NULL)
2647 return -ESRCH;
2648
2649 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2650 if (r_skb == NULL) {
2651 xfrm_state_put(x);
2652 return -ENOMEM;
2653 }
2654
2655 /*
2656 * XXX: is this lock really needed - none of the other
2657 * gets lock (the concern is things getting updated
2658 * while we are still reading) - jhs
2659 */
2660 spin_lock_bh(&x->lock);
2661 c.data.aevent = p->flags;
2662 c.seq = nlh->nlmsg_seq;
2663 c.portid = nlh->nlmsg_pid;
2664
2665 err = build_aevent(r_skb, x, &c);
2666 BUG_ON(err < 0);
2667
2668 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2669 spin_unlock_bh(&x->lock);
2670 xfrm_state_put(x);
2671 return err;
2672 }
2673
2674 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2675 struct nlattr **attrs, struct netlink_ext_ack *extack)
2676 {
2677 struct net *net = sock_net(skb->sk);
2678 struct xfrm_state *x;
2679 struct km_event c;
2680 int err = -EINVAL;
2681 u32 mark = 0;
2682 struct xfrm_mark m;
2683 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2684 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2685 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2686 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2687 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2688 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2689
2690 if (!lt && !rp && !re && !et && !rt) {
2691 NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
2692 return err;
2693 }
2694
2695 /* pedantic mode - thou shalt sayeth replaceth */
2696 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
2697 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
2698 return err;
2699 }
2700
2701 mark = xfrm_mark_get(attrs, &m);
2702
2703 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2704 if (x == NULL)
2705 return -ESRCH;
2706
2707 if (x->km.state != XFRM_STATE_VALID) {
2708 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2709 goto out;
2710 }
2711
2712 err = xfrm_replay_verify_len(x->replay_esn, re, extack);
2713 if (err)
2714 goto out;
2715
2716 spin_lock_bh(&x->lock);
2717 xfrm_update_ae_params(x, attrs, 1);
2718 spin_unlock_bh(&x->lock);
2719
2720 c.event = nlh->nlmsg_type;
2721 c.seq = nlh->nlmsg_seq;
2722 c.portid = nlh->nlmsg_pid;
2723 c.data.aevent = XFRM_AE_CU;
2724 km_state_notify(x, &c);
2725 err = 0;
2726 out:
2727 xfrm_state_put(x);
2728 return err;
2729 }
2730
2731 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2732 struct nlattr **attrs,
2733 struct netlink_ext_ack *extack)
2734 {
2735 struct net *net = sock_net(skb->sk);
2736 struct km_event c;
2737 u8 type = XFRM_POLICY_TYPE_MAIN;
2738 int err;
2739
2740 err = copy_from_user_policy_type(&type, attrs, extack);
2741 if (err)
2742 return err;
2743
2744 err = xfrm_policy_flush(net, type, true);
2745 if (err) {
2746 if (err == -ESRCH) /* empty table */
2747 return 0;
2748 return err;
2749 }
2750
2751 c.data.type = type;
2752 c.event = nlh->nlmsg_type;
2753 c.seq = nlh->nlmsg_seq;
2754 c.portid = nlh->nlmsg_pid;
2755 c.net = net;
2756 km_policy_notify(NULL, 0, &c);
2757 return 0;
2758 }
2759
2760 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2761 struct nlattr **attrs,
2762 struct netlink_ext_ack *extack)
2763 {
2764 struct net *net = sock_net(skb->sk);
2765 struct xfrm_policy *xp;
2766 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2767 struct xfrm_userpolicy_info *p = &up->pol;
2768 u8 type = XFRM_POLICY_TYPE_MAIN;
2769 int err = -ENOENT;
2770 struct xfrm_mark m;
2771 u32 if_id = 0;
2772
2773 err = copy_from_user_policy_type(&type, attrs, extack);
2774 if (err)
2775 return err;
2776
2777 err = verify_policy_dir(p->dir, extack);
2778 if (err)
2779 return err;
2780
2781 if (attrs[XFRMA_IF_ID])
2782 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2783
2784 xfrm_mark_get(attrs, &m);
2785
2786 if (p->index)
2787 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2788 0, &err);
2789 else {
2790 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2791 struct xfrm_sec_ctx *ctx;
2792
2793 err = verify_sec_ctx_len(attrs, extack);
2794 if (err)
2795 return err;
2796
2797 ctx = NULL;
2798 if (rt) {
2799 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2800
2801 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2802 if (err)
2803 return err;
2804 }
2805 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2806 &p->sel, ctx, 0, &err);
2807 security_xfrm_policy_free(ctx);
2808 }
2809 if (xp == NULL)
2810 return -ENOENT;
2811
2812 if (unlikely(xp->walk.dead))
2813 goto out;
2814
2815 err = 0;
2816 if (up->hard) {
2817 xfrm_policy_delete(xp, p->dir);
2818 xfrm_audit_policy_delete(xp, 1, true);
2819 }
2820 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2821
2822 out:
2823 xfrm_pol_put(xp);
2824 return err;
2825 }
2826
2827 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2828 struct nlattr **attrs,
2829 struct netlink_ext_ack *extack)
2830 {
2831 struct net *net = sock_net(skb->sk);
2832 struct xfrm_state *x;
2833 int err;
2834 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2835 struct xfrm_usersa_info *p = &ue->state;
2836 struct xfrm_mark m;
2837 u32 mark = xfrm_mark_get(attrs, &m);
2838
2839 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2840
2841 err = -ENOENT;
2842 if (x == NULL)
2843 return err;
2844
2845 spin_lock_bh(&x->lock);
2846 err = -EINVAL;
2847 if (x->km.state != XFRM_STATE_VALID) {
2848 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2849 goto out;
2850 }
2851
2852 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2853
2854 if (ue->hard) {
2855 __xfrm_state_delete(x);
2856 xfrm_audit_state_delete(x, 1, true);
2857 }
2858 err = 0;
2859 out:
2860 spin_unlock_bh(&x->lock);
2861 xfrm_state_put(x);
2862 return err;
2863 }
2864
2865 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2866 struct nlattr **attrs,
2867 struct netlink_ext_ack *extack)
2868 {
2869 struct net *net = sock_net(skb->sk);
2870 struct xfrm_policy *xp;
2871 struct xfrm_user_tmpl *ut;
2872 int i;
2873 struct nlattr *rt = attrs[XFRMA_TMPL];
2874 struct xfrm_mark mark;
2875
2876 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2877 struct xfrm_state *x = xfrm_state_alloc(net);
2878 int err = -ENOMEM;
2879
2880 if (!x)
2881 goto nomem;
2882
2883 xfrm_mark_get(attrs, &mark);
2884
2885 if (attrs[XFRMA_SA_PCPU]) {
2886 x->pcpu_num = nla_get_u32(attrs[XFRMA_SA_PCPU]);
2887 err = -EINVAL;
2888 if (x->pcpu_num >= num_possible_cpus())
2889 goto free_state;
2890 }
2891
2892 err = verify_newpolicy_info(&ua->policy, extack);
2893 if (err)
2894 goto free_state;
2895 err = verify_sec_ctx_len(attrs, extack);
2896 if (err)
2897 goto free_state;
2898
2899 /* build an XP */
2900 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
2901 if (!xp)
2902 goto free_state;
2903
2904 memcpy(&x->id, &ua->id, sizeof(ua->id));
2905 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2906 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2907 xp->mark.m = x->mark.m = mark.m;
2908 xp->mark.v = x->mark.v = mark.v;
2909 ut = nla_data(rt);
2910 /* extract the templates and for each call km_key */
2911 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2912 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2913 memcpy(&x->id, &t->id, sizeof(x->id));
2914 x->props.mode = t->mode;
2915 x->props.reqid = t->reqid;
2916 x->props.family = ut->family;
2917 t->aalgos = ua->aalgos;
2918 t->ealgos = ua->ealgos;
2919 t->calgos = ua->calgos;
2920 err = km_query(x, t, xp);
2921
2922 }
2923
2924 xfrm_state_free(x);
2925 kfree(xp);
2926
2927 return 0;
2928
2929 free_state:
2930 xfrm_state_free(x);
2931 nomem:
2932 return err;
2933 }
2934
2935 #ifdef CONFIG_XFRM_MIGRATE
2936 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2937 struct xfrm_kmaddress *k,
2938 struct nlattr **attrs, int *num,
2939 struct netlink_ext_ack *extack)
2940 {
2941 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2942 struct xfrm_user_migrate *um;
2943 int i, num_migrate;
2944
2945 if (k != NULL) {
2946 struct xfrm_user_kmaddress *uk;
2947
2948 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2949 memcpy(&k->local, &uk->local, sizeof(k->local));
2950 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2951 k->family = uk->family;
2952 k->reserved = uk->reserved;
2953 }
2954
2955 um = nla_data(rt);
2956 num_migrate = nla_len(rt) / sizeof(*um);
2957
2958 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) {
2959 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
2960 return -EINVAL;
2961 }
2962
2963 for (i = 0; i < num_migrate; i++, um++, ma++) {
2964 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2965 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2966 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2967 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2968
2969 ma->proto = um->proto;
2970 ma->mode = um->mode;
2971 ma->reqid = um->reqid;
2972
2973 ma->old_family = um->old_family;
2974 ma->new_family = um->new_family;
2975 }
2976
2977 *num = i;
2978 return 0;
2979 }
2980
2981 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2982 struct nlattr **attrs, struct netlink_ext_ack *extack)
2983 {
2984 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2985 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2986 struct xfrm_kmaddress km, *kmp;
2987 u8 type;
2988 int err;
2989 int n = 0;
2990 struct net *net = sock_net(skb->sk);
2991 struct xfrm_encap_tmpl *encap = NULL;
2992 u32 if_id = 0;
2993
2994 if (!attrs[XFRMA_MIGRATE]) {
2995 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
2996 return -EINVAL;
2997 }
2998
2999 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
3000
3001 err = copy_from_user_policy_type(&type, attrs, extack);
3002 if (err)
3003 return err;
3004
3005 err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
3006 if (err)
3007 return err;
3008
3009 if (!n)
3010 return 0;
3011
3012 if (attrs[XFRMA_ENCAP]) {
3013 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
3014 sizeof(*encap), GFP_KERNEL);
3015 if (!encap)
3016 return -ENOMEM;
3017 }
3018
3019 if (attrs[XFRMA_IF_ID])
3020 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
3021
3022 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
3023 if_id, extack);
3024
3025 kfree(encap);
3026
3027 return err;
3028 }
3029 #else
3030 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
3031 struct nlattr **attrs, struct netlink_ext_ack *extack)
3032 {
3033 return -ENOPROTOOPT;
3034 }
3035 #endif
3036
3037 #ifdef CONFIG_XFRM_MIGRATE
3038 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
3039 {
3040 struct xfrm_user_migrate um;
3041
3042 memset(&um, 0, sizeof(um));
3043 um.proto = m->proto;
3044 um.mode = m->mode;
3045 um.reqid = m->reqid;
3046 um.old_family = m->old_family;
3047 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
3048 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
3049 um.new_family = m->new_family;
3050 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
3051 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
3052
3053 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
3054 }
3055
3056 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
3057 {
3058 struct xfrm_user_kmaddress uk;
3059
3060 memset(&uk, 0, sizeof(uk));
3061 uk.family = k->family;
3062 uk.reserved = k->reserved;
3063 memcpy(&uk.local, &k->local, sizeof(uk.local));
3064 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
3065
3066 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
3067 }
3068
3069 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
3070 int with_encp)
3071 {
3072 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
3073 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
3074 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
3075 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
3076 + userpolicy_type_attrsize();
3077 }
3078
3079 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
3080 int num_migrate, const struct xfrm_kmaddress *k,
3081 const struct xfrm_selector *sel,
3082 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
3083 {
3084 const struct xfrm_migrate *mp;
3085 struct xfrm_userpolicy_id *pol_id;
3086 struct nlmsghdr *nlh;
3087 int i, err;
3088
3089 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
3090 if (nlh == NULL)
3091 return -EMSGSIZE;
3092
3093 pol_id = nlmsg_data(nlh);
3094 /* copy data from selector, dir, and type to the pol_id */
3095 memset(pol_id, 0, sizeof(*pol_id));
3096 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
3097 pol_id->dir = dir;
3098
3099 if (k != NULL) {
3100 err = copy_to_user_kmaddress(k, skb);
3101 if (err)
3102 goto out_cancel;
3103 }
3104 if (encap) {
3105 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
3106 if (err)
3107 goto out_cancel;
3108 }
3109 err = copy_to_user_policy_type(type, skb);
3110 if (err)
3111 goto out_cancel;
3112 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
3113 err = copy_to_user_migrate(mp, skb);
3114 if (err)
3115 goto out_cancel;
3116 }
3117
3118 nlmsg_end(skb, nlh);
3119 return 0;
3120
3121 out_cancel:
3122 nlmsg_cancel(skb, nlh);
3123 return err;
3124 }
3125
3126 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3127 const struct xfrm_migrate *m, int num_migrate,
3128 const struct xfrm_kmaddress *k,
3129 const struct xfrm_encap_tmpl *encap)
3130 {
3131 struct net *net = &init_net;
3132 struct sk_buff *skb;
3133 int err;
3134
3135 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
3136 GFP_ATOMIC);
3137 if (skb == NULL)
3138 return -ENOMEM;
3139
3140 /* build migrate */
3141 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
3142 BUG_ON(err < 0);
3143
3144 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
3145 }
3146 #else
3147 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3148 const struct xfrm_migrate *m, int num_migrate,
3149 const struct xfrm_kmaddress *k,
3150 const struct xfrm_encap_tmpl *encap)
3151 {
3152 return -ENOPROTOOPT;
3153 }
3154 #endif
3155
3156 #define XMSGSIZE(type) sizeof(struct type)
3157
3158 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
3159 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3160 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3161 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
3162 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3163 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3164 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3165 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
3166 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
3167 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
3168 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3169 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3170 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
3171 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
3172 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
3173 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3174 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3175 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
3176 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3177 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
3178 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3179 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3180 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3181 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3182 };
3183 EXPORT_SYMBOL_GPL(xfrm_msg_min);
3184
3185 #undef XMSGSIZE
3186
3187 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
3188 [XFRMA_UNSPEC] = { .strict_start_type = XFRMA_SA_DIR },
3189 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
3190 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
3191 [XFRMA_LASTUSED] = { .type = NLA_U64},
3192 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
3193 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
3194 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
3195 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
3196 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
3197 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
3198 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
3199 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
3200 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
3201 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
3202 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
3203 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
3204 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
3205 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
3206 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
3207 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
3208 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
3209 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
3210 [XFRMA_TFCPAD] = { .type = NLA_U32 },
3211 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
3212 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
3213 [XFRMA_PROTO] = { .type = NLA_U8 },
3214 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
3215 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
3216 [XFRMA_SET_MARK] = { .type = NLA_U32 },
3217 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
3218 [XFRMA_IF_ID] = { .type = NLA_U32 },
3219 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
3220 [XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT),
3221 [XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 },
3222 [XFRMA_SA_PCPU] = { .type = NLA_U32 },
3223 };
3224 EXPORT_SYMBOL_GPL(xfrma_policy);
3225
3226 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
3227 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3228 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3229 };
3230
3231 static const struct xfrm_link {
3232 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **,
3233 struct netlink_ext_ack *);
3234 int (*start)(struct netlink_callback *);
3235 int (*dump)(struct sk_buff *, struct netlink_callback *);
3236 int (*done)(struct netlink_callback *);
3237 const struct nla_policy *nla_pol;
3238 int nla_max;
3239 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
3240 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3241 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
3242 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
3243 .dump = xfrm_dump_sa,
3244 .done = xfrm_dump_sa_done },
3245 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3246 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
3247 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
3248 .start = xfrm_dump_policy_start,
3249 .dump = xfrm_dump_policy,
3250 .done = xfrm_dump_policy_done },
3251 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
3252 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
3253 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
3254 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3255 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3256 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
3257 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
3258 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
3259 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
3260 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
3261 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
3262 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
3263 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
3264 .nla_pol = xfrma_spd_policy,
3265 .nla_max = XFRMA_SPD_MAX },
3266 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
3267 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
3268 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
3269 };
3270
3271 static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
3272 struct netlink_ext_ack *extack)
3273 {
3274 if (attrs[XFRMA_SA_DIR]) {
3275 switch (type) {
3276 case XFRM_MSG_NEWSA:
3277 case XFRM_MSG_UPDSA:
3278 case XFRM_MSG_ALLOCSPI:
3279 break;
3280 default:
3281 NL_SET_ERR_MSG(extack, "Invalid attribute SA_DIR");
3282 return -EINVAL;
3283 }
3284 }
3285
3286 if (attrs[XFRMA_SA_PCPU]) {
3287 switch (type) {
3288 case XFRM_MSG_NEWSA:
3289 case XFRM_MSG_UPDSA:
3290 case XFRM_MSG_ALLOCSPI:
3291 case XFRM_MSG_ACQUIRE:
3292
3293 break;
3294 default:
3295 NL_SET_ERR_MSG(extack, "Invalid attribute SA_PCPU");
3296 return -EINVAL;
3297 }
3298 }
3299
3300 return 0;
3301 }
3302
3303 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
3304 struct netlink_ext_ack *extack)
3305 {
3306 struct net *net = sock_net(skb->sk);
3307 struct nlattr *attrs[XFRMA_MAX+1];
3308 const struct xfrm_link *link;
3309 struct nlmsghdr *nlh64 = NULL;
3310 int type, err;
3311
3312 type = nlh->nlmsg_type;
3313 if (type > XFRM_MSG_MAX)
3314 return -EINVAL;
3315
3316 type -= XFRM_MSG_BASE;
3317 link = &xfrm_dispatch[type];
3318
3319 /* All operations require privileges, even GET */
3320 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
3321 return -EPERM;
3322
3323 if (in_compat_syscall()) {
3324 struct xfrm_translator *xtr = xfrm_get_translator();
3325
3326 if (!xtr)
3327 return -EOPNOTSUPP;
3328
3329 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
3330 link->nla_pol, extack);
3331 xfrm_put_translator(xtr);
3332 if (IS_ERR(nlh64))
3333 return PTR_ERR(nlh64);
3334 if (nlh64)
3335 nlh = nlh64;
3336 }
3337
3338 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
3339 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
3340 (nlh->nlmsg_flags & NLM_F_DUMP)) {
3341 struct netlink_dump_control c = {
3342 .start = link->start,
3343 .dump = link->dump,
3344 .done = link->done,
3345 };
3346
3347 if (link->dump == NULL) {
3348 err = -EINVAL;
3349 goto err;
3350 }
3351
3352 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
3353 goto err;
3354 }
3355
3356 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
3357 link->nla_max ? : XFRMA_MAX,
3358 link->nla_pol ? : xfrma_policy, extack);
3359 if (err < 0)
3360 goto err;
3361
3362 if (!link->nla_pol || link->nla_pol == xfrma_policy) {
3363 err = xfrm_reject_unused_attr((type + XFRM_MSG_BASE), attrs, extack);
3364 if (err < 0)
3365 goto err;
3366 }
3367
3368 if (link->doit == NULL) {
3369 err = -EINVAL;
3370 goto err;
3371 }
3372
3373 err = link->doit(skb, nlh, attrs, extack);
3374
3375 /* We need to free skb allocated in xfrm_alloc_compat() before
3376 * returning from this function, because consume_skb() won't take
3377 * care of frag_list since netlink destructor sets
3378 * sbk->head to NULL. (see netlink_skb_destructor())
3379 */
3380 if (skb_has_frag_list(skb)) {
3381 kfree_skb(skb_shinfo(skb)->frag_list);
3382 skb_shinfo(skb)->frag_list = NULL;
3383 }
3384
3385 err:
3386 kvfree(nlh64);
3387 return err;
3388 }
3389
3390 static void xfrm_netlink_rcv(struct sk_buff *skb)
3391 {
3392 struct net *net = sock_net(skb->sk);
3393
3394 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3395 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
3396 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3397 }
3398
3399 static inline unsigned int xfrm_expire_msgsize(void)
3400 {
3401 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) +
3402 nla_total_size(sizeof(struct xfrm_mark)) +
3403 nla_total_size(sizeof_field(struct xfrm_state, dir)) +
3404 nla_total_size(4); /* XFRMA_SA_PCPU */
3405 }
3406
3407 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
3408 {
3409 struct xfrm_user_expire *ue;
3410 struct nlmsghdr *nlh;
3411 int err;
3412
3413 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
3414 if (nlh == NULL)
3415 return -EMSGSIZE;
3416
3417 ue = nlmsg_data(nlh);
3418 copy_to_user_state(x, &ue->state);
3419 ue->hard = (c->data.hard != 0) ? 1 : 0;
3420 /* clear the padding bytes */
3421 memset_after(ue, 0, hard);
3422
3423 err = xfrm_mark_put(skb, &x->mark);
3424 if (err)
3425 return err;
3426
3427 err = xfrm_if_id_put(skb, x->if_id);
3428 if (err)
3429 return err;
3430 if (x->pcpu_num != UINT_MAX) {
3431 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
3432 if (err)
3433 return err;
3434 }
3435
3436 if (x->dir) {
3437 err = nla_put_u8(skb, XFRMA_SA_DIR, x->dir);
3438 if (err)
3439 return err;
3440 }
3441
3442 nlmsg_end(skb, nlh);
3443 return 0;
3444 }
3445
3446 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
3447 {
3448 struct net *net = xs_net(x);
3449 struct sk_buff *skb;
3450
3451 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
3452 if (skb == NULL)
3453 return -ENOMEM;
3454
3455 if (build_expire(skb, x, c) < 0) {
3456 kfree_skb(skb);
3457 return -EMSGSIZE;
3458 }
3459
3460 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3461 }
3462
3463 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3464 {
3465 struct net *net = xs_net(x);
3466 struct sk_buff *skb;
3467 int err;
3468
3469 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3470 if (skb == NULL)
3471 return -ENOMEM;
3472
3473 err = build_aevent(skb, x, c);
3474 BUG_ON(err < 0);
3475
3476 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3477 }
3478
3479 static int xfrm_notify_sa_flush(const struct km_event *c)
3480 {
3481 struct net *net = c->net;
3482 struct xfrm_usersa_flush *p;
3483 struct nlmsghdr *nlh;
3484 struct sk_buff *skb;
3485 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3486
3487 skb = nlmsg_new(len, GFP_ATOMIC);
3488 if (skb == NULL)
3489 return -ENOMEM;
3490
3491 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3492 if (nlh == NULL) {
3493 kfree_skb(skb);
3494 return -EMSGSIZE;
3495 }
3496
3497 p = nlmsg_data(nlh);
3498 p->proto = c->data.proto;
3499
3500 nlmsg_end(skb, nlh);
3501
3502 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3503 }
3504
3505 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3506 {
3507 unsigned int l = 0;
3508 if (x->aead)
3509 l += nla_total_size(aead_len(x->aead));
3510 if (x->aalg) {
3511 l += nla_total_size(sizeof(struct xfrm_algo) +
3512 (x->aalg->alg_key_len + 7) / 8);
3513 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3514 }
3515 if (x->ealg)
3516 l += nla_total_size(xfrm_alg_len(x->ealg));
3517 if (x->calg)
3518 l += nla_total_size(sizeof(*x->calg));
3519 if (x->encap)
3520 l += nla_total_size(sizeof(*x->encap));
3521 if (x->tfcpad)
3522 l += nla_total_size(sizeof(x->tfcpad));
3523 if (x->replay_esn)
3524 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3525 else
3526 l += nla_total_size(sizeof(struct xfrm_replay_state));
3527 if (x->security)
3528 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3529 x->security->ctx_len);
3530 if (x->coaddr)
3531 l += nla_total_size(sizeof(*x->coaddr));
3532 if (x->props.extra_flags)
3533 l += nla_total_size(sizeof(x->props.extra_flags));
3534 if (x->xso.dev)
3535 l += nla_total_size(sizeof(struct xfrm_user_offload));
3536 if (x->props.smark.v | x->props.smark.m) {
3537 l += nla_total_size(sizeof(x->props.smark.v));
3538 l += nla_total_size(sizeof(x->props.smark.m));
3539 }
3540 if (x->if_id)
3541 l += nla_total_size(sizeof(x->if_id));
3542 if (x->pcpu_num)
3543 l += nla_total_size(sizeof(x->pcpu_num));
3544
3545 /* Must count x->lastused as it may become non-zero behind our back. */
3546 l += nla_total_size_64bit(sizeof(u64));
3547
3548 if (x->mapping_maxage)
3549 l += nla_total_size(sizeof(x->mapping_maxage));
3550
3551 if (x->dir)
3552 l += nla_total_size(sizeof(x->dir));
3553
3554 if (x->nat_keepalive_interval)
3555 l += nla_total_size(sizeof(x->nat_keepalive_interval));
3556
3557 return l;
3558 }
3559
3560 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3561 {
3562 struct net *net = xs_net(x);
3563 struct xfrm_usersa_info *p;
3564 struct xfrm_usersa_id *id;
3565 struct nlmsghdr *nlh;
3566 struct sk_buff *skb;
3567 unsigned int len = xfrm_sa_len(x);
3568 unsigned int headlen;
3569 int err;
3570
3571 headlen = sizeof(*p);
3572 if (c->event == XFRM_MSG_DELSA) {
3573 len += nla_total_size(headlen);
3574 headlen = sizeof(*id);
3575 len += nla_total_size(sizeof(struct xfrm_mark));
3576 }
3577 len += NLMSG_ALIGN(headlen);
3578
3579 skb = nlmsg_new(len, GFP_ATOMIC);
3580 if (skb == NULL)
3581 return -ENOMEM;
3582
3583 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3584 err = -EMSGSIZE;
3585 if (nlh == NULL)
3586 goto out_free_skb;
3587
3588 p = nlmsg_data(nlh);
3589 if (c->event == XFRM_MSG_DELSA) {
3590 struct nlattr *attr;
3591
3592 id = nlmsg_data(nlh);
3593 memset(id, 0, sizeof(*id));
3594 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3595 id->spi = x->id.spi;
3596 id->family = x->props.family;
3597 id->proto = x->id.proto;
3598
3599 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3600 err = -EMSGSIZE;
3601 if (attr == NULL)
3602 goto out_free_skb;
3603
3604 p = nla_data(attr);
3605 }
3606 err = copy_to_user_state_extra(x, p, skb);
3607 if (err)
3608 goto out_free_skb;
3609
3610 nlmsg_end(skb, nlh);
3611
3612 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3613
3614 out_free_skb:
3615 kfree_skb(skb);
3616 return err;
3617 }
3618
3619 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3620 {
3621
3622 switch (c->event) {
3623 case XFRM_MSG_EXPIRE:
3624 return xfrm_exp_state_notify(x, c);
3625 case XFRM_MSG_NEWAE:
3626 return xfrm_aevent_state_notify(x, c);
3627 case XFRM_MSG_DELSA:
3628 case XFRM_MSG_UPDSA:
3629 case XFRM_MSG_NEWSA:
3630 return xfrm_notify_sa(x, c);
3631 case XFRM_MSG_FLUSHSA:
3632 return xfrm_notify_sa_flush(c);
3633 default:
3634 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3635 c->event);
3636 break;
3637 }
3638
3639 return 0;
3640
3641 }
3642
3643 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3644 struct xfrm_policy *xp)
3645 {
3646 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3647 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3648 + nla_total_size(sizeof(struct xfrm_mark))
3649 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3650 + nla_total_size(4) /* XFRMA_SA_PCPU */
3651 + userpolicy_type_attrsize();
3652 }
3653
3654 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3655 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3656 {
3657 __u32 seq = xfrm_get_acqseq();
3658 struct xfrm_user_acquire *ua;
3659 struct nlmsghdr *nlh;
3660 int err;
3661
3662 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3663 if (nlh == NULL)
3664 return -EMSGSIZE;
3665
3666 ua = nlmsg_data(nlh);
3667 memcpy(&ua->id, &x->id, sizeof(ua->id));
3668 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3669 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3670 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3671 ua->aalgos = xt->aalgos;
3672 ua->ealgos = xt->ealgos;
3673 ua->calgos = xt->calgos;
3674 ua->seq = x->km.seq = seq;
3675
3676 err = copy_to_user_tmpl(xp, skb);
3677 if (!err)
3678 err = copy_to_user_state_sec_ctx(x, skb);
3679 if (!err)
3680 err = copy_to_user_policy_type(xp->type, skb);
3681 if (!err)
3682 err = xfrm_mark_put(skb, &xp->mark);
3683 if (!err)
3684 err = xfrm_if_id_put(skb, xp->if_id);
3685 if (!err && xp->xdo.dev)
3686 err = copy_user_offload(&xp->xdo, skb);
3687 if (!err && x->pcpu_num != UINT_MAX)
3688 err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
3689 if (err) {
3690 nlmsg_cancel(skb, nlh);
3691 return err;
3692 }
3693
3694 nlmsg_end(skb, nlh);
3695 return 0;
3696 }
3697
3698 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3699 struct xfrm_policy *xp)
3700 {
3701 struct net *net = xs_net(x);
3702 struct sk_buff *skb;
3703 int err;
3704
3705 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3706 if (skb == NULL)
3707 return -ENOMEM;
3708
3709 err = build_acquire(skb, x, xt, xp);
3710 BUG_ON(err < 0);
3711
3712 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3713 }
3714
3715 /* User gives us xfrm_user_policy_info followed by an array of 0
3716 * or more templates.
3717 */
3718 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3719 u8 *data, int len, int *dir)
3720 {
3721 struct net *net = sock_net(sk);
3722 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3723 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3724 struct xfrm_policy *xp;
3725 int nr;
3726
3727 switch (sk->sk_family) {
3728 case AF_INET:
3729 if (opt != IP_XFRM_POLICY) {
3730 *dir = -EOPNOTSUPP;
3731 return NULL;
3732 }
3733 break;
3734 #if IS_ENABLED(CONFIG_IPV6)
3735 case AF_INET6:
3736 if (opt != IPV6_XFRM_POLICY) {
3737 *dir = -EOPNOTSUPP;
3738 return NULL;
3739 }
3740 break;
3741 #endif
3742 default:
3743 *dir = -EINVAL;
3744 return NULL;
3745 }
3746
3747 *dir = -EINVAL;
3748
3749 if (len < sizeof(*p) ||
3750 verify_newpolicy_info(p, NULL))
3751 return NULL;
3752
3753 nr = ((len - sizeof(*p)) / sizeof(*ut));
3754 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
3755 return NULL;
3756
3757 if (p->dir > XFRM_POLICY_OUT)
3758 return NULL;
3759
3760 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3761 if (xp == NULL) {
3762 *dir = -ENOBUFS;
3763 return NULL;
3764 }
3765
3766 copy_from_user_policy(xp, p);
3767 xp->type = XFRM_POLICY_TYPE_MAIN;
3768 copy_templates(xp, ut, nr);
3769
3770 *dir = p->dir;
3771
3772 return xp;
3773 }
3774
3775 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3776 {
3777 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3778 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3779 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3780 + nla_total_size(sizeof(struct xfrm_mark))
3781 + userpolicy_type_attrsize();
3782 }
3783
3784 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3785 int dir, const struct km_event *c)
3786 {
3787 struct xfrm_user_polexpire *upe;
3788 int hard = c->data.hard;
3789 struct nlmsghdr *nlh;
3790 int err;
3791
3792 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3793 if (nlh == NULL)
3794 return -EMSGSIZE;
3795
3796 upe = nlmsg_data(nlh);
3797 copy_to_user_policy(xp, &upe->pol, dir);
3798 err = copy_to_user_tmpl(xp, skb);
3799 if (!err)
3800 err = copy_to_user_sec_ctx(xp, skb);
3801 if (!err)
3802 err = copy_to_user_policy_type(xp->type, skb);
3803 if (!err)
3804 err = xfrm_mark_put(skb, &xp->mark);
3805 if (!err)
3806 err = xfrm_if_id_put(skb, xp->if_id);
3807 if (!err && xp->xdo.dev)
3808 err = copy_user_offload(&xp->xdo, skb);
3809 if (err) {
3810 nlmsg_cancel(skb, nlh);
3811 return err;
3812 }
3813 upe->hard = !!hard;
3814
3815 nlmsg_end(skb, nlh);
3816 return 0;
3817 }
3818
3819 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3820 {
3821 struct net *net = xp_net(xp);
3822 struct sk_buff *skb;
3823 int err;
3824
3825 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3826 if (skb == NULL)
3827 return -ENOMEM;
3828
3829 err = build_polexpire(skb, xp, dir, c);
3830 BUG_ON(err < 0);
3831
3832 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3833 }
3834
3835 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3836 {
3837 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3838 struct net *net = xp_net(xp);
3839 struct xfrm_userpolicy_info *p;
3840 struct xfrm_userpolicy_id *id;
3841 struct nlmsghdr *nlh;
3842 struct sk_buff *skb;
3843 unsigned int headlen;
3844 int err;
3845
3846 headlen = sizeof(*p);
3847 if (c->event == XFRM_MSG_DELPOLICY) {
3848 len += nla_total_size(headlen);
3849 headlen = sizeof(*id);
3850 }
3851 len += userpolicy_type_attrsize();
3852 len += nla_total_size(sizeof(struct xfrm_mark));
3853 len += NLMSG_ALIGN(headlen);
3854
3855 skb = nlmsg_new(len, GFP_ATOMIC);
3856 if (skb == NULL)
3857 return -ENOMEM;
3858
3859 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3860 err = -EMSGSIZE;
3861 if (nlh == NULL)
3862 goto out_free_skb;
3863
3864 p = nlmsg_data(nlh);
3865 if (c->event == XFRM_MSG_DELPOLICY) {
3866 struct nlattr *attr;
3867
3868 id = nlmsg_data(nlh);
3869 memset(id, 0, sizeof(*id));
3870 id->dir = dir;
3871 if (c->data.byid)
3872 id->index = xp->index;
3873 else
3874 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3875
3876 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3877 err = -EMSGSIZE;
3878 if (attr == NULL)
3879 goto out_free_skb;
3880
3881 p = nla_data(attr);
3882 }
3883
3884 copy_to_user_policy(xp, p, dir);
3885 err = copy_to_user_tmpl(xp, skb);
3886 if (!err)
3887 err = copy_to_user_policy_type(xp->type, skb);
3888 if (!err)
3889 err = xfrm_mark_put(skb, &xp->mark);
3890 if (!err)
3891 err = xfrm_if_id_put(skb, xp->if_id);
3892 if (!err && xp->xdo.dev)
3893 err = copy_user_offload(&xp->xdo, skb);
3894 if (err)
3895 goto out_free_skb;
3896
3897 nlmsg_end(skb, nlh);
3898
3899 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3900
3901 out_free_skb:
3902 kfree_skb(skb);
3903 return err;
3904 }
3905
3906 static int xfrm_notify_policy_flush(const struct km_event *c)
3907 {
3908 struct net *net = c->net;
3909 struct nlmsghdr *nlh;
3910 struct sk_buff *skb;
3911 int err;
3912
3913 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3914 if (skb == NULL)
3915 return -ENOMEM;
3916
3917 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3918 err = -EMSGSIZE;
3919 if (nlh == NULL)
3920 goto out_free_skb;
3921 err = copy_to_user_policy_type(c->data.type, skb);
3922 if (err)
3923 goto out_free_skb;
3924
3925 nlmsg_end(skb, nlh);
3926
3927 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3928
3929 out_free_skb:
3930 kfree_skb(skb);
3931 return err;
3932 }
3933
3934 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3935 {
3936
3937 switch (c->event) {
3938 case XFRM_MSG_NEWPOLICY:
3939 case XFRM_MSG_UPDPOLICY:
3940 case XFRM_MSG_DELPOLICY:
3941 return xfrm_notify_policy(xp, dir, c);
3942 case XFRM_MSG_FLUSHPOLICY:
3943 return xfrm_notify_policy_flush(c);
3944 case XFRM_MSG_POLEXPIRE:
3945 return xfrm_exp_policy_notify(xp, dir, c);
3946 default:
3947 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3948 c->event);
3949 }
3950
3951 return 0;
3952
3953 }
3954
3955 static inline unsigned int xfrm_report_msgsize(void)
3956 {
3957 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3958 }
3959
3960 static int build_report(struct sk_buff *skb, u8 proto,
3961 struct xfrm_selector *sel, xfrm_address_t *addr)
3962 {
3963 struct xfrm_user_report *ur;
3964 struct nlmsghdr *nlh;
3965
3966 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3967 if (nlh == NULL)
3968 return -EMSGSIZE;
3969
3970 ur = nlmsg_data(nlh);
3971 ur->proto = proto;
3972 memcpy(&ur->sel, sel, sizeof(ur->sel));
3973
3974 if (addr) {
3975 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3976 if (err) {
3977 nlmsg_cancel(skb, nlh);
3978 return err;
3979 }
3980 }
3981 nlmsg_end(skb, nlh);
3982 return 0;
3983 }
3984
3985 static int xfrm_send_report(struct net *net, u8 proto,
3986 struct xfrm_selector *sel, xfrm_address_t *addr)
3987 {
3988 struct sk_buff *skb;
3989 int err;
3990
3991 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3992 if (skb == NULL)
3993 return -ENOMEM;
3994
3995 err = build_report(skb, proto, sel, addr);
3996 BUG_ON(err < 0);
3997
3998 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3999 }
4000
4001 static inline unsigned int xfrm_mapping_msgsize(void)
4002 {
4003 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
4004 }
4005
4006 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
4007 xfrm_address_t *new_saddr, __be16 new_sport)
4008 {
4009 struct xfrm_user_mapping *um;
4010 struct nlmsghdr *nlh;
4011
4012 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
4013 if (nlh == NULL)
4014 return -EMSGSIZE;
4015
4016 um = nlmsg_data(nlh);
4017
4018 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
4019 um->id.spi = x->id.spi;
4020 um->id.family = x->props.family;
4021 um->id.proto = x->id.proto;
4022 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
4023 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
4024 um->new_sport = new_sport;
4025 um->old_sport = x->encap->encap_sport;
4026 um->reqid = x->props.reqid;
4027
4028 nlmsg_end(skb, nlh);
4029 return 0;
4030 }
4031
4032 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
4033 __be16 sport)
4034 {
4035 struct net *net = xs_net(x);
4036 struct sk_buff *skb;
4037 int err;
4038
4039 if (x->id.proto != IPPROTO_ESP)
4040 return -EINVAL;
4041
4042 if (!x->encap)
4043 return -EINVAL;
4044
4045 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
4046 if (skb == NULL)
4047 return -ENOMEM;
4048
4049 err = build_mapping(skb, x, ipaddr, sport);
4050 BUG_ON(err < 0);
4051
4052 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
4053 }
4054
4055 static bool xfrm_is_alive(const struct km_event *c)
4056 {
4057 return (bool)xfrm_acquire_is_on(c->net);
4058 }
4059
4060 static struct xfrm_mgr netlink_mgr = {
4061 .notify = xfrm_send_state_notify,
4062 .acquire = xfrm_send_acquire,
4063 .compile_policy = xfrm_compile_policy,
4064 .notify_policy = xfrm_send_policy_notify,
4065 .report = xfrm_send_report,
4066 .migrate = xfrm_send_migrate,
4067 .new_mapping = xfrm_send_mapping,
4068 .is_alive = xfrm_is_alive,
4069 };
4070
4071 static int __net_init xfrm_user_net_init(struct net *net)
4072 {
4073 struct sock *nlsk;
4074 struct netlink_kernel_cfg cfg = {
4075 .groups = XFRMNLGRP_MAX,
4076 .input = xfrm_netlink_rcv,
4077 };
4078
4079 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
4080 if (nlsk == NULL)
4081 return -ENOMEM;
4082 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
4083 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
4084 return 0;
4085 }
4086
4087 static void __net_exit xfrm_user_net_pre_exit(struct net *net)
4088 {
4089 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
4090 }
4091
4092 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
4093 {
4094 struct net *net;
4095
4096 list_for_each_entry(net, net_exit_list, exit_list)
4097 netlink_kernel_release(net->xfrm.nlsk_stash);
4098 }
4099
4100 static struct pernet_operations xfrm_user_net_ops = {
4101 .init = xfrm_user_net_init,
4102 .pre_exit = xfrm_user_net_pre_exit,
4103 .exit_batch = xfrm_user_net_exit,
4104 };
4105
4106 static int __init xfrm_user_init(void)
4107 {
4108 int rv;
4109
4110 printk(KERN_INFO "Initializing XFRM netlink socket\n");
4111
4112 rv = register_pernet_subsys(&xfrm_user_net_ops);
4113 if (rv < 0)
4114 return rv;
4115 xfrm_register_km(&netlink_mgr);
4116 return 0;
4117 }
4118
4119 static void __exit xfrm_user_exit(void)
4120 {
4121 xfrm_unregister_km(&netlink_mgr);
4122 unregister_pernet_subsys(&xfrm_user_net_ops);
4123 }
4124
4125 module_init(xfrm_user_init);
4126 module_exit(xfrm_user_exit);
4127 MODULE_DESCRIPTION("XFRM User interface");
4128 MODULE_LICENSE("GPL");
4129 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
Kernel DRM miscellaneous fixes and cross-tree changes