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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
38static 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
68static 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
87static 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
105static 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
114static 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
132static 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
198static 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
469out:
470 return err;
471}
472
473static 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
501static 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
529static 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
561static 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
595static 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
623static 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
661static 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
694static 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
705static 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*/
727static 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
772static 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
783static 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
891error:
892 x->km.state = XFRM_STATE_DEAD;
893 xfrm_state_put(x);
894error_no_put:
895 *errp = err;
896 return NULL;
897}
898
899static 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);
939out:
940 xfrm_state_put(x);
941 return err;
942}
943
944static 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
978static 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
1009out:
1010 xfrm_audit_state_delete(x, err ? 0 : 1, true);
1011 xfrm_state_put(x);
1012 return err;
1013}
1014
1015static 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
1036struct 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
1043static 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
1064static 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
1084static bool xfrm_redact(void)
1085{
1086 return IS_ENABLED(CONFIG_SECURITY) &&
1087 security_locked_down(LOCKDOWN_XFRM_SECRET);
1088}
1089
1090static 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
1126static 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
1148static 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
1170static 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
1185static 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
1204static 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! */
1217static 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 }
1323out:
1324 return ret;
1325}
1326
1327static 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
1365static 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
1376static 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
1429static 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 */
1457static 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
1482static 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
1491static 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
1544static 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
1598static 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
1619static 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
1626static 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
1658static 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
1679static 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);
1699out_noput:
1700 return err;
1701}
1702
1703static 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
1788out:
1789 xfrm_state_put(x);
1790out_noput:
1791 return err;
1792}
1793
1794static 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
1810static 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
1827static 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
1892static 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
1904static 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
1929static 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
1996static 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
2017static 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
2038static 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
2050static 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
2065static 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
2112static 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
2160static 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
2192static 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
2200static 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}
2206static 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
2216static 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
2228static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2229{
2230 return 0;
2231}
2232#endif
2233
2234static 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
2282static 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
2291static 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
2301static 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
2317static 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
2343static 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
2375static bool xfrm_userpolicy_is_valid(__u8 policy)
2376{
2377 return policy == XFRM_USERPOLICY_BLOCK ||
2378 policy == XFRM_USERPOLICY_ACCEPT;
2379}
2380
2381static 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
2402static 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
2432static 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
2511out:
2512 xfrm_pol_put(xp);
2513 return err;
2514}
2515
2516static 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
2541static 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
2557static 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
2625out_cancel:
2626 nlmsg_cancel(skb, nlh);
2627 return err;
2628}
2629
2630static 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
2674static 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;
2726out:
2727 xfrm_state_put(x);
2728 return err;
2729}
2730
2731static 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
2760static 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
2822out:
2823 xfrm_pol_put(xp);
2824 return err;
2825}
2826
2827static 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;
2859out:
2860 spin_unlock_bh(&x->lock);
2861 xfrm_state_put(x);
2862 return err;
2863}
2864
2865static 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
2929free_state:
2930 xfrm_state_free(x);
2931nomem:
2932 return err;
2933}
2934
2935#ifdef CONFIG_XFRM_MIGRATE
2936static 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
2981static 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
3030static 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
3038static 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
3056static 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
3069static 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
3079static 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
3121out_cancel:
3122 nlmsg_cancel(skb, nlh);
3123 return err;
3124}
3125
3126static 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
3147static 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
3158const 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};
3183EXPORT_SYMBOL_GPL(xfrm_msg_min);
3184
3185#undef XMSGSIZE
3186
3187const 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};
3224EXPORT_SYMBOL_GPL(xfrma_policy);
3225
3226static 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
3231static 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
3271static 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
3303static 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
3385err:
3386 kvfree(nlh64);
3387 return err;
3388}
3389
3390static 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
3399static 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
3407static 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
3446static 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
3463static 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
3479static 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
3505static 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
3560static 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
3614out_free_skb:
3615 kfree_skb(skb);
3616 return err;
3617}
3618
3619static 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
3643static 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
3654static 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
3698static 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 */
3718static 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
3775static 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
3784static 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
3819static 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
3835static 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
3901out_free_skb:
3902 kfree_skb(skb);
3903 return err;
3904}
3905
3906static 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
3929out_free_skb:
3930 kfree_skb(skb);
3931 return err;
3932}
3933
3934static 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
3955static inline unsigned int xfrm_report_msgsize(void)
3956{
3957 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3958}
3959
3960static 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
3985static 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
4001static inline unsigned int xfrm_mapping_msgsize(void)
4002{
4003 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
4004}
4005
4006static 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
4032static 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
4055static bool xfrm_is_alive(const struct km_event *c)
4056{
4057 return (bool)xfrm_acquire_is_on(c->net);
4058}
4059
4060static 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
4071static 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
4087static void __net_exit xfrm_user_net_pre_exit(struct net *net)
4088{
4089 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
4090}
4091
4092static 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
4100static 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
4106static 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
4119static void __exit xfrm_user_exit(void)
4120{
4121 xfrm_unregister_km(&netlink_mgr);
4122 unregister_pernet_subsys(&xfrm_user_net_ops);
4123}
4124
4125module_init(xfrm_user_init);
4126module_exit(xfrm_user_exit);
4127MODULE_DESCRIPTION("XFRM User interface");
4128MODULE_LICENSE("GPL");
4129MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
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/crypto.h>
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/socket.h>
20#include <linux/string.h>
21#include <linux/net.h>
22#include <linux/skbuff.h>
23#include <linux/pfkeyv2.h>
24#include <linux/ipsec.h>
25#include <linux/init.h>
26#include <linux/security.h>
27#include <net/sock.h>
28#include <net/xfrm.h>
29#include <net/netlink.h>
30#include <net/ah.h>
31#include <linux/uaccess.h>
32#if IS_ENABLED(CONFIG_IPV6)
33#include <linux/in6.h>
34#endif
35#include <asm/unaligned.h>
36
37static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
38{
39 struct nlattr *rt = attrs[type];
40 struct xfrm_algo *algp;
41
42 if (!rt)
43 return 0;
44
45 algp = nla_data(rt);
46 if (nla_len(rt) < (int)xfrm_alg_len(algp))
47 return -EINVAL;
48
49 switch (type) {
50 case XFRMA_ALG_AUTH:
51 case XFRMA_ALG_CRYPT:
52 case XFRMA_ALG_COMP:
53 break;
54
55 default:
56 return -EINVAL;
57 }
58
59 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
60 return 0;
61}
62
63static int verify_auth_trunc(struct nlattr **attrs)
64{
65 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
66 struct xfrm_algo_auth *algp;
67
68 if (!rt)
69 return 0;
70
71 algp = nla_data(rt);
72 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
73 return -EINVAL;
74
75 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
76 return 0;
77}
78
79static int verify_aead(struct nlattr **attrs)
80{
81 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
82 struct xfrm_algo_aead *algp;
83
84 if (!rt)
85 return 0;
86
87 algp = nla_data(rt);
88 if (nla_len(rt) < (int)aead_len(algp))
89 return -EINVAL;
90
91 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
92 return 0;
93}
94
95static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
96 xfrm_address_t **addrp)
97{
98 struct nlattr *rt = attrs[type];
99
100 if (rt && addrp)
101 *addrp = nla_data(rt);
102}
103
104static inline int verify_sec_ctx_len(struct nlattr **attrs)
105{
106 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
107 struct xfrm_user_sec_ctx *uctx;
108
109 if (!rt)
110 return 0;
111
112 uctx = nla_data(rt);
113 if (uctx->len > nla_len(rt) ||
114 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
115 return -EINVAL;
116
117 return 0;
118}
119
120static inline int verify_replay(struct xfrm_usersa_info *p,
121 struct nlattr **attrs)
122{
123 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
124 struct xfrm_replay_state_esn *rs;
125
126 if (!rt)
127 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
128
129 rs = nla_data(rt);
130
131 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
132 return -EINVAL;
133
134 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
135 nla_len(rt) != sizeof(*rs))
136 return -EINVAL;
137
138 /* As only ESP and AH support ESN feature. */
139 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
140 return -EINVAL;
141
142 if (p->replay_window != 0)
143 return -EINVAL;
144
145 return 0;
146}
147
148static int verify_newsa_info(struct xfrm_usersa_info *p,
149 struct nlattr **attrs)
150{
151 int err;
152
153 err = -EINVAL;
154 switch (p->family) {
155 case AF_INET:
156 break;
157
158 case AF_INET6:
159#if IS_ENABLED(CONFIG_IPV6)
160 break;
161#else
162 err = -EAFNOSUPPORT;
163 goto out;
164#endif
165
166 default:
167 goto out;
168 }
169
170 switch (p->sel.family) {
171 case AF_UNSPEC:
172 break;
173
174 case AF_INET:
175 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
176 goto out;
177
178 break;
179
180 case AF_INET6:
181#if IS_ENABLED(CONFIG_IPV6)
182 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
183 goto out;
184
185 break;
186#else
187 err = -EAFNOSUPPORT;
188 goto out;
189#endif
190
191 default:
192 goto out;
193 }
194
195 err = -EINVAL;
196 switch (p->id.proto) {
197 case IPPROTO_AH:
198 if ((!attrs[XFRMA_ALG_AUTH] &&
199 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
200 attrs[XFRMA_ALG_AEAD] ||
201 attrs[XFRMA_ALG_CRYPT] ||
202 attrs[XFRMA_ALG_COMP] ||
203 attrs[XFRMA_TFCPAD])
204 goto out;
205 break;
206
207 case IPPROTO_ESP:
208 if (attrs[XFRMA_ALG_COMP])
209 goto out;
210 if (!attrs[XFRMA_ALG_AUTH] &&
211 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
212 !attrs[XFRMA_ALG_CRYPT] &&
213 !attrs[XFRMA_ALG_AEAD])
214 goto out;
215 if ((attrs[XFRMA_ALG_AUTH] ||
216 attrs[XFRMA_ALG_AUTH_TRUNC] ||
217 attrs[XFRMA_ALG_CRYPT]) &&
218 attrs[XFRMA_ALG_AEAD])
219 goto out;
220 if (attrs[XFRMA_TFCPAD] &&
221 p->mode != XFRM_MODE_TUNNEL)
222 goto out;
223 break;
224
225 case IPPROTO_COMP:
226 if (!attrs[XFRMA_ALG_COMP] ||
227 attrs[XFRMA_ALG_AEAD] ||
228 attrs[XFRMA_ALG_AUTH] ||
229 attrs[XFRMA_ALG_AUTH_TRUNC] ||
230 attrs[XFRMA_ALG_CRYPT] ||
231 attrs[XFRMA_TFCPAD] ||
232 (ntohl(p->id.spi) >= 0x10000))
233 goto out;
234 break;
235
236#if IS_ENABLED(CONFIG_IPV6)
237 case IPPROTO_DSTOPTS:
238 case IPPROTO_ROUTING:
239 if (attrs[XFRMA_ALG_COMP] ||
240 attrs[XFRMA_ALG_AUTH] ||
241 attrs[XFRMA_ALG_AUTH_TRUNC] ||
242 attrs[XFRMA_ALG_AEAD] ||
243 attrs[XFRMA_ALG_CRYPT] ||
244 attrs[XFRMA_ENCAP] ||
245 attrs[XFRMA_SEC_CTX] ||
246 attrs[XFRMA_TFCPAD] ||
247 !attrs[XFRMA_COADDR])
248 goto out;
249 break;
250#endif
251
252 default:
253 goto out;
254 }
255
256 if ((err = verify_aead(attrs)))
257 goto out;
258 if ((err = verify_auth_trunc(attrs)))
259 goto out;
260 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
261 goto out;
262 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
263 goto out;
264 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
265 goto out;
266 if ((err = verify_sec_ctx_len(attrs)))
267 goto out;
268 if ((err = verify_replay(p, attrs)))
269 goto out;
270
271 err = -EINVAL;
272 switch (p->mode) {
273 case XFRM_MODE_TRANSPORT:
274 case XFRM_MODE_TUNNEL:
275 case XFRM_MODE_ROUTEOPTIMIZATION:
276 case XFRM_MODE_BEET:
277 break;
278
279 default:
280 goto out;
281 }
282
283 err = 0;
284
285out:
286 return err;
287}
288
289static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
290 struct xfrm_algo_desc *(*get_byname)(const char *, int),
291 struct nlattr *rta)
292{
293 struct xfrm_algo *p, *ualg;
294 struct xfrm_algo_desc *algo;
295
296 if (!rta)
297 return 0;
298
299 ualg = nla_data(rta);
300
301 algo = get_byname(ualg->alg_name, 1);
302 if (!algo)
303 return -ENOSYS;
304 *props = algo->desc.sadb_alg_id;
305
306 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
307 if (!p)
308 return -ENOMEM;
309
310 strcpy(p->alg_name, algo->name);
311 *algpp = p;
312 return 0;
313}
314
315static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
316{
317 struct xfrm_algo *p, *ualg;
318 struct xfrm_algo_desc *algo;
319
320 if (!rta)
321 return 0;
322
323 ualg = nla_data(rta);
324
325 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
326 if (!algo)
327 return -ENOSYS;
328 x->props.ealgo = algo->desc.sadb_alg_id;
329
330 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
331 if (!p)
332 return -ENOMEM;
333
334 strcpy(p->alg_name, algo->name);
335 x->ealg = p;
336 x->geniv = algo->uinfo.encr.geniv;
337 return 0;
338}
339
340static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
341 struct nlattr *rta)
342{
343 struct xfrm_algo *ualg;
344 struct xfrm_algo_auth *p;
345 struct xfrm_algo_desc *algo;
346
347 if (!rta)
348 return 0;
349
350 ualg = nla_data(rta);
351
352 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
353 if (!algo)
354 return -ENOSYS;
355 *props = algo->desc.sadb_alg_id;
356
357 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
358 if (!p)
359 return -ENOMEM;
360
361 strcpy(p->alg_name, algo->name);
362 p->alg_key_len = ualg->alg_key_len;
363 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
364 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
365
366 *algpp = p;
367 return 0;
368}
369
370static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
371 struct nlattr *rta)
372{
373 struct xfrm_algo_auth *p, *ualg;
374 struct xfrm_algo_desc *algo;
375
376 if (!rta)
377 return 0;
378
379 ualg = nla_data(rta);
380
381 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
382 if (!algo)
383 return -ENOSYS;
384 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
385 return -EINVAL;
386 *props = algo->desc.sadb_alg_id;
387
388 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
389 if (!p)
390 return -ENOMEM;
391
392 strcpy(p->alg_name, algo->name);
393 if (!p->alg_trunc_len)
394 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
395
396 *algpp = p;
397 return 0;
398}
399
400static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
401{
402 struct xfrm_algo_aead *p, *ualg;
403 struct xfrm_algo_desc *algo;
404
405 if (!rta)
406 return 0;
407
408 ualg = nla_data(rta);
409
410 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
411 if (!algo)
412 return -ENOSYS;
413 x->props.ealgo = algo->desc.sadb_alg_id;
414
415 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
416 if (!p)
417 return -ENOMEM;
418
419 strcpy(p->alg_name, algo->name);
420 x->aead = p;
421 x->geniv = algo->uinfo.aead.geniv;
422 return 0;
423}
424
425static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
426 struct nlattr *rp)
427{
428 struct xfrm_replay_state_esn *up;
429 unsigned int ulen;
430
431 if (!replay_esn || !rp)
432 return 0;
433
434 up = nla_data(rp);
435 ulen = xfrm_replay_state_esn_len(up);
436
437 /* Check the overall length and the internal bitmap length to avoid
438 * potential overflow. */
439 if (nla_len(rp) < (int)ulen ||
440 xfrm_replay_state_esn_len(replay_esn) != ulen ||
441 replay_esn->bmp_len != up->bmp_len)
442 return -EINVAL;
443
444 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
445 return -EINVAL;
446
447 return 0;
448}
449
450static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
451 struct xfrm_replay_state_esn **preplay_esn,
452 struct nlattr *rta)
453{
454 struct xfrm_replay_state_esn *p, *pp, *up;
455 unsigned int klen, ulen;
456
457 if (!rta)
458 return 0;
459
460 up = nla_data(rta);
461 klen = xfrm_replay_state_esn_len(up);
462 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
463
464 p = kzalloc(klen, GFP_KERNEL);
465 if (!p)
466 return -ENOMEM;
467
468 pp = kzalloc(klen, GFP_KERNEL);
469 if (!pp) {
470 kfree(p);
471 return -ENOMEM;
472 }
473
474 memcpy(p, up, ulen);
475 memcpy(pp, up, ulen);
476
477 *replay_esn = p;
478 *preplay_esn = pp;
479
480 return 0;
481}
482
483static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
484{
485 unsigned int len = 0;
486
487 if (xfrm_ctx) {
488 len += sizeof(struct xfrm_user_sec_ctx);
489 len += xfrm_ctx->ctx_len;
490 }
491 return len;
492}
493
494static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
495{
496 memcpy(&x->id, &p->id, sizeof(x->id));
497 memcpy(&x->sel, &p->sel, sizeof(x->sel));
498 memcpy(&x->lft, &p->lft, sizeof(x->lft));
499 x->props.mode = p->mode;
500 x->props.replay_window = min_t(unsigned int, p->replay_window,
501 sizeof(x->replay.bitmap) * 8);
502 x->props.reqid = p->reqid;
503 x->props.family = p->family;
504 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
505 x->props.flags = p->flags;
506
507 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
508 x->sel.family = p->family;
509}
510
511/*
512 * someday when pfkey also has support, we could have the code
513 * somehow made shareable and move it to xfrm_state.c - JHS
514 *
515*/
516static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
517 int update_esn)
518{
519 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
520 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
521 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
522 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
523 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
524
525 if (re) {
526 struct xfrm_replay_state_esn *replay_esn;
527 replay_esn = nla_data(re);
528 memcpy(x->replay_esn, replay_esn,
529 xfrm_replay_state_esn_len(replay_esn));
530 memcpy(x->preplay_esn, replay_esn,
531 xfrm_replay_state_esn_len(replay_esn));
532 }
533
534 if (rp) {
535 struct xfrm_replay_state *replay;
536 replay = nla_data(rp);
537 memcpy(&x->replay, replay, sizeof(*replay));
538 memcpy(&x->preplay, replay, sizeof(*replay));
539 }
540
541 if (lt) {
542 struct xfrm_lifetime_cur *ltime;
543 ltime = nla_data(lt);
544 x->curlft.bytes = ltime->bytes;
545 x->curlft.packets = ltime->packets;
546 x->curlft.add_time = ltime->add_time;
547 x->curlft.use_time = ltime->use_time;
548 }
549
550 if (et)
551 x->replay_maxage = nla_get_u32(et);
552
553 if (rt)
554 x->replay_maxdiff = nla_get_u32(rt);
555}
556
557static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
558{
559 if (attrs[XFRMA_SET_MARK]) {
560 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
561 if (attrs[XFRMA_SET_MARK_MASK])
562 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
563 else
564 m->m = 0xffffffff;
565 } else {
566 m->v = m->m = 0;
567 }
568}
569
570static struct xfrm_state *xfrm_state_construct(struct net *net,
571 struct xfrm_usersa_info *p,
572 struct nlattr **attrs,
573 int *errp)
574{
575 struct xfrm_state *x = xfrm_state_alloc(net);
576 int err = -ENOMEM;
577
578 if (!x)
579 goto error_no_put;
580
581 copy_from_user_state(x, p);
582
583 if (attrs[XFRMA_SA_EXTRA_FLAGS])
584 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
585
586 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
587 goto error;
588 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
589 attrs[XFRMA_ALG_AUTH_TRUNC])))
590 goto error;
591 if (!x->props.aalgo) {
592 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
593 attrs[XFRMA_ALG_AUTH])))
594 goto error;
595 }
596 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
597 goto error;
598 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
599 xfrm_calg_get_byname,
600 attrs[XFRMA_ALG_COMP])))
601 goto error;
602
603 if (attrs[XFRMA_ENCAP]) {
604 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
605 sizeof(*x->encap), GFP_KERNEL);
606 if (x->encap == NULL)
607 goto error;
608 }
609
610 if (attrs[XFRMA_TFCPAD])
611 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
612
613 if (attrs[XFRMA_COADDR]) {
614 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
615 sizeof(*x->coaddr), GFP_KERNEL);
616 if (x->coaddr == NULL)
617 goto error;
618 }
619
620 xfrm_mark_get(attrs, &x->mark);
621
622 xfrm_smark_init(attrs, &x->props.smark);
623
624 if (attrs[XFRMA_IF_ID])
625 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
626
627 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
628 if (err)
629 goto error;
630
631 if (attrs[XFRMA_SEC_CTX]) {
632 err = security_xfrm_state_alloc(x,
633 nla_data(attrs[XFRMA_SEC_CTX]));
634 if (err)
635 goto error;
636 }
637
638 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
639 attrs[XFRMA_REPLAY_ESN_VAL])))
640 goto error;
641
642 x->km.seq = p->seq;
643 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
644 /* sysctl_xfrm_aevent_etime is in 100ms units */
645 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
646
647 if ((err = xfrm_init_replay(x)))
648 goto error;
649
650 /* override default values from above */
651 xfrm_update_ae_params(x, attrs, 0);
652
653 /* configure the hardware if offload is requested */
654 if (attrs[XFRMA_OFFLOAD_DEV]) {
655 err = xfrm_dev_state_add(net, x,
656 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
657 if (err)
658 goto error;
659 }
660
661 return x;
662
663error:
664 x->km.state = XFRM_STATE_DEAD;
665 xfrm_state_put(x);
666error_no_put:
667 *errp = err;
668 return NULL;
669}
670
671static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
672 struct nlattr **attrs)
673{
674 struct net *net = sock_net(skb->sk);
675 struct xfrm_usersa_info *p = nlmsg_data(nlh);
676 struct xfrm_state *x;
677 int err;
678 struct km_event c;
679
680 err = verify_newsa_info(p, attrs);
681 if (err)
682 return err;
683
684 x = xfrm_state_construct(net, p, attrs, &err);
685 if (!x)
686 return err;
687
688 xfrm_state_hold(x);
689 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
690 err = xfrm_state_add(x);
691 else
692 err = xfrm_state_update(x);
693
694 xfrm_audit_state_add(x, err ? 0 : 1, true);
695
696 if (err < 0) {
697 x->km.state = XFRM_STATE_DEAD;
698 xfrm_dev_state_delete(x);
699 __xfrm_state_put(x);
700 goto out;
701 }
702
703 if (x->km.state == XFRM_STATE_VOID)
704 x->km.state = XFRM_STATE_VALID;
705
706 c.seq = nlh->nlmsg_seq;
707 c.portid = nlh->nlmsg_pid;
708 c.event = nlh->nlmsg_type;
709
710 km_state_notify(x, &c);
711out:
712 xfrm_state_put(x);
713 return err;
714}
715
716static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
717 struct xfrm_usersa_id *p,
718 struct nlattr **attrs,
719 int *errp)
720{
721 struct xfrm_state *x = NULL;
722 struct xfrm_mark m;
723 int err;
724 u32 mark = xfrm_mark_get(attrs, &m);
725
726 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
727 err = -ESRCH;
728 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
729 } else {
730 xfrm_address_t *saddr = NULL;
731
732 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
733 if (!saddr) {
734 err = -EINVAL;
735 goto out;
736 }
737
738 err = -ESRCH;
739 x = xfrm_state_lookup_byaddr(net, mark,
740 &p->daddr, saddr,
741 p->proto, p->family);
742 }
743
744 out:
745 if (!x && errp)
746 *errp = err;
747 return x;
748}
749
750static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
751 struct nlattr **attrs)
752{
753 struct net *net = sock_net(skb->sk);
754 struct xfrm_state *x;
755 int err = -ESRCH;
756 struct km_event c;
757 struct xfrm_usersa_id *p = nlmsg_data(nlh);
758
759 x = xfrm_user_state_lookup(net, p, attrs, &err);
760 if (x == NULL)
761 return err;
762
763 if ((err = security_xfrm_state_delete(x)) != 0)
764 goto out;
765
766 if (xfrm_state_kern(x)) {
767 err = -EPERM;
768 goto out;
769 }
770
771 err = xfrm_state_delete(x);
772
773 if (err < 0)
774 goto out;
775
776 c.seq = nlh->nlmsg_seq;
777 c.portid = nlh->nlmsg_pid;
778 c.event = nlh->nlmsg_type;
779 km_state_notify(x, &c);
780
781out:
782 xfrm_audit_state_delete(x, err ? 0 : 1, true);
783 xfrm_state_put(x);
784 return err;
785}
786
787static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
788{
789 memset(p, 0, sizeof(*p));
790 memcpy(&p->id, &x->id, sizeof(p->id));
791 memcpy(&p->sel, &x->sel, sizeof(p->sel));
792 memcpy(&p->lft, &x->lft, sizeof(p->lft));
793 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
794 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
795 put_unaligned(x->stats.replay, &p->stats.replay);
796 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
797 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
798 p->mode = x->props.mode;
799 p->replay_window = x->props.replay_window;
800 p->reqid = x->props.reqid;
801 p->family = x->props.family;
802 p->flags = x->props.flags;
803 p->seq = x->km.seq;
804}
805
806struct xfrm_dump_info {
807 struct sk_buff *in_skb;
808 struct sk_buff *out_skb;
809 u32 nlmsg_seq;
810 u16 nlmsg_flags;
811};
812
813static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
814{
815 struct xfrm_user_sec_ctx *uctx;
816 struct nlattr *attr;
817 int ctx_size = sizeof(*uctx) + s->ctx_len;
818
819 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
820 if (attr == NULL)
821 return -EMSGSIZE;
822
823 uctx = nla_data(attr);
824 uctx->exttype = XFRMA_SEC_CTX;
825 uctx->len = ctx_size;
826 uctx->ctx_doi = s->ctx_doi;
827 uctx->ctx_alg = s->ctx_alg;
828 uctx->ctx_len = s->ctx_len;
829 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
830
831 return 0;
832}
833
834static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
835{
836 struct xfrm_user_offload *xuo;
837 struct nlattr *attr;
838
839 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
840 if (attr == NULL)
841 return -EMSGSIZE;
842
843 xuo = nla_data(attr);
844 memset(xuo, 0, sizeof(*xuo));
845 xuo->ifindex = xso->dev->ifindex;
846 xuo->flags = xso->flags;
847
848 return 0;
849}
850
851static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
852{
853 struct xfrm_algo *algo;
854 struct nlattr *nla;
855
856 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
857 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
858 if (!nla)
859 return -EMSGSIZE;
860
861 algo = nla_data(nla);
862 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
863 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
864 algo->alg_key_len = auth->alg_key_len;
865
866 return 0;
867}
868
869static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
870{
871 int ret = 0;
872
873 if (m->v | m->m) {
874 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
875 if (!ret)
876 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
877 }
878 return ret;
879}
880
881/* Don't change this without updating xfrm_sa_len! */
882static int copy_to_user_state_extra(struct xfrm_state *x,
883 struct xfrm_usersa_info *p,
884 struct sk_buff *skb)
885{
886 int ret = 0;
887
888 copy_to_user_state(x, p);
889
890 if (x->props.extra_flags) {
891 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
892 x->props.extra_flags);
893 if (ret)
894 goto out;
895 }
896
897 if (x->coaddr) {
898 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
899 if (ret)
900 goto out;
901 }
902 if (x->lastused) {
903 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
904 XFRMA_PAD);
905 if (ret)
906 goto out;
907 }
908 if (x->aead) {
909 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
910 if (ret)
911 goto out;
912 }
913 if (x->aalg) {
914 ret = copy_to_user_auth(x->aalg, skb);
915 if (!ret)
916 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
917 xfrm_alg_auth_len(x->aalg), x->aalg);
918 if (ret)
919 goto out;
920 }
921 if (x->ealg) {
922 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
923 if (ret)
924 goto out;
925 }
926 if (x->calg) {
927 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
928 if (ret)
929 goto out;
930 }
931 if (x->encap) {
932 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
933 if (ret)
934 goto out;
935 }
936 if (x->tfcpad) {
937 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
938 if (ret)
939 goto out;
940 }
941 ret = xfrm_mark_put(skb, &x->mark);
942 if (ret)
943 goto out;
944
945 ret = xfrm_smark_put(skb, &x->props.smark);
946 if (ret)
947 goto out;
948
949 if (x->replay_esn)
950 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
951 xfrm_replay_state_esn_len(x->replay_esn),
952 x->replay_esn);
953 else
954 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
955 &x->replay);
956 if (ret)
957 goto out;
958 if(x->xso.dev)
959 ret = copy_user_offload(&x->xso, skb);
960 if (ret)
961 goto out;
962 if (x->if_id) {
963 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
964 if (ret)
965 goto out;
966 }
967 if (x->security)
968 ret = copy_sec_ctx(x->security, skb);
969out:
970 return ret;
971}
972
973static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
974{
975 struct xfrm_dump_info *sp = ptr;
976 struct sk_buff *in_skb = sp->in_skb;
977 struct sk_buff *skb = sp->out_skb;
978 struct xfrm_usersa_info *p;
979 struct nlmsghdr *nlh;
980 int err;
981
982 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
983 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
984 if (nlh == NULL)
985 return -EMSGSIZE;
986
987 p = nlmsg_data(nlh);
988
989 err = copy_to_user_state_extra(x, p, skb);
990 if (err) {
991 nlmsg_cancel(skb, nlh);
992 return err;
993 }
994 nlmsg_end(skb, nlh);
995 return 0;
996}
997
998static int xfrm_dump_sa_done(struct netlink_callback *cb)
999{
1000 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1001 struct sock *sk = cb->skb->sk;
1002 struct net *net = sock_net(sk);
1003
1004 if (cb->args[0])
1005 xfrm_state_walk_done(walk, net);
1006 return 0;
1007}
1008
1009static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1010static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1011{
1012 struct net *net = sock_net(skb->sk);
1013 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1014 struct xfrm_dump_info info;
1015
1016 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1017 sizeof(cb->args) - sizeof(cb->args[0]));
1018
1019 info.in_skb = cb->skb;
1020 info.out_skb = skb;
1021 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1022 info.nlmsg_flags = NLM_F_MULTI;
1023
1024 if (!cb->args[0]) {
1025 struct nlattr *attrs[XFRMA_MAX+1];
1026 struct xfrm_address_filter *filter = NULL;
1027 u8 proto = 0;
1028 int err;
1029
1030 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1031 xfrma_policy, cb->extack);
1032 if (err < 0)
1033 return err;
1034
1035 if (attrs[XFRMA_ADDRESS_FILTER]) {
1036 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1037 sizeof(*filter), GFP_KERNEL);
1038 if (filter == NULL)
1039 return -ENOMEM;
1040 }
1041
1042 if (attrs[XFRMA_PROTO])
1043 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1044
1045 xfrm_state_walk_init(walk, proto, filter);
1046 cb->args[0] = 1;
1047 }
1048
1049 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1050
1051 return skb->len;
1052}
1053
1054static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1055 struct xfrm_state *x, u32 seq)
1056{
1057 struct xfrm_dump_info info;
1058 struct sk_buff *skb;
1059 int err;
1060
1061 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1062 if (!skb)
1063 return ERR_PTR(-ENOMEM);
1064
1065 info.in_skb = in_skb;
1066 info.out_skb = skb;
1067 info.nlmsg_seq = seq;
1068 info.nlmsg_flags = 0;
1069
1070 err = dump_one_state(x, 0, &info);
1071 if (err) {
1072 kfree_skb(skb);
1073 return ERR_PTR(err);
1074 }
1075
1076 return skb;
1077}
1078
1079/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1080 * Must be called with RCU read lock.
1081 */
1082static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1083 u32 pid, unsigned int group)
1084{
1085 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1086
1087 if (!nlsk) {
1088 kfree_skb(skb);
1089 return -EPIPE;
1090 }
1091
1092 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1093}
1094
1095static inline unsigned int xfrm_spdinfo_msgsize(void)
1096{
1097 return NLMSG_ALIGN(4)
1098 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1099 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1100 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1101 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1102}
1103
1104static int build_spdinfo(struct sk_buff *skb, struct net *net,
1105 u32 portid, u32 seq, u32 flags)
1106{
1107 struct xfrmk_spdinfo si;
1108 struct xfrmu_spdinfo spc;
1109 struct xfrmu_spdhinfo sph;
1110 struct xfrmu_spdhthresh spt4, spt6;
1111 struct nlmsghdr *nlh;
1112 int err;
1113 u32 *f;
1114 unsigned lseq;
1115
1116 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1117 if (nlh == NULL) /* shouldn't really happen ... */
1118 return -EMSGSIZE;
1119
1120 f = nlmsg_data(nlh);
1121 *f = flags;
1122 xfrm_spd_getinfo(net, &si);
1123 spc.incnt = si.incnt;
1124 spc.outcnt = si.outcnt;
1125 spc.fwdcnt = si.fwdcnt;
1126 spc.inscnt = si.inscnt;
1127 spc.outscnt = si.outscnt;
1128 spc.fwdscnt = si.fwdscnt;
1129 sph.spdhcnt = si.spdhcnt;
1130 sph.spdhmcnt = si.spdhmcnt;
1131
1132 do {
1133 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1134
1135 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1136 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1137 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1138 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1139 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1140
1141 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1142 if (!err)
1143 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1144 if (!err)
1145 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1146 if (!err)
1147 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1148 if (err) {
1149 nlmsg_cancel(skb, nlh);
1150 return err;
1151 }
1152
1153 nlmsg_end(skb, nlh);
1154 return 0;
1155}
1156
1157static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1158 struct nlattr **attrs)
1159{
1160 struct net *net = sock_net(skb->sk);
1161 struct xfrmu_spdhthresh *thresh4 = NULL;
1162 struct xfrmu_spdhthresh *thresh6 = NULL;
1163
1164 /* selector prefixlen thresholds to hash policies */
1165 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1166 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1167
1168 if (nla_len(rta) < sizeof(*thresh4))
1169 return -EINVAL;
1170 thresh4 = nla_data(rta);
1171 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1172 return -EINVAL;
1173 }
1174 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1175 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1176
1177 if (nla_len(rta) < sizeof(*thresh6))
1178 return -EINVAL;
1179 thresh6 = nla_data(rta);
1180 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1181 return -EINVAL;
1182 }
1183
1184 if (thresh4 || thresh6) {
1185 write_seqlock(&net->xfrm.policy_hthresh.lock);
1186 if (thresh4) {
1187 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1188 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1189 }
1190 if (thresh6) {
1191 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1192 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1193 }
1194 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1195
1196 xfrm_policy_hash_rebuild(net);
1197 }
1198
1199 return 0;
1200}
1201
1202static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1203 struct nlattr **attrs)
1204{
1205 struct net *net = sock_net(skb->sk);
1206 struct sk_buff *r_skb;
1207 u32 *flags = nlmsg_data(nlh);
1208 u32 sportid = NETLINK_CB(skb).portid;
1209 u32 seq = nlh->nlmsg_seq;
1210 int err;
1211
1212 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1213 if (r_skb == NULL)
1214 return -ENOMEM;
1215
1216 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1217 BUG_ON(err < 0);
1218
1219 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1220}
1221
1222static inline unsigned int xfrm_sadinfo_msgsize(void)
1223{
1224 return NLMSG_ALIGN(4)
1225 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1226 + nla_total_size(4); /* XFRMA_SAD_CNT */
1227}
1228
1229static int build_sadinfo(struct sk_buff *skb, struct net *net,
1230 u32 portid, u32 seq, u32 flags)
1231{
1232 struct xfrmk_sadinfo si;
1233 struct xfrmu_sadhinfo sh;
1234 struct nlmsghdr *nlh;
1235 int err;
1236 u32 *f;
1237
1238 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1239 if (nlh == NULL) /* shouldn't really happen ... */
1240 return -EMSGSIZE;
1241
1242 f = nlmsg_data(nlh);
1243 *f = flags;
1244 xfrm_sad_getinfo(net, &si);
1245
1246 sh.sadhmcnt = si.sadhmcnt;
1247 sh.sadhcnt = si.sadhcnt;
1248
1249 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1250 if (!err)
1251 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1252 if (err) {
1253 nlmsg_cancel(skb, nlh);
1254 return err;
1255 }
1256
1257 nlmsg_end(skb, nlh);
1258 return 0;
1259}
1260
1261static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1262 struct nlattr **attrs)
1263{
1264 struct net *net = sock_net(skb->sk);
1265 struct sk_buff *r_skb;
1266 u32 *flags = nlmsg_data(nlh);
1267 u32 sportid = NETLINK_CB(skb).portid;
1268 u32 seq = nlh->nlmsg_seq;
1269 int err;
1270
1271 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1272 if (r_skb == NULL)
1273 return -ENOMEM;
1274
1275 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1276 BUG_ON(err < 0);
1277
1278 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1279}
1280
1281static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1282 struct nlattr **attrs)
1283{
1284 struct net *net = sock_net(skb->sk);
1285 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1286 struct xfrm_state *x;
1287 struct sk_buff *resp_skb;
1288 int err = -ESRCH;
1289
1290 x = xfrm_user_state_lookup(net, p, attrs, &err);
1291 if (x == NULL)
1292 goto out_noput;
1293
1294 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1295 if (IS_ERR(resp_skb)) {
1296 err = PTR_ERR(resp_skb);
1297 } else {
1298 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1299 }
1300 xfrm_state_put(x);
1301out_noput:
1302 return err;
1303}
1304
1305static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1306 struct nlattr **attrs)
1307{
1308 struct net *net = sock_net(skb->sk);
1309 struct xfrm_state *x;
1310 struct xfrm_userspi_info *p;
1311 struct sk_buff *resp_skb;
1312 xfrm_address_t *daddr;
1313 int family;
1314 int err;
1315 u32 mark;
1316 struct xfrm_mark m;
1317 u32 if_id = 0;
1318
1319 p = nlmsg_data(nlh);
1320 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1321 if (err)
1322 goto out_noput;
1323
1324 family = p->info.family;
1325 daddr = &p->info.id.daddr;
1326
1327 x = NULL;
1328
1329 mark = xfrm_mark_get(attrs, &m);
1330
1331 if (attrs[XFRMA_IF_ID])
1332 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1333
1334 if (p->info.seq) {
1335 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1336 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1337 xfrm_state_put(x);
1338 x = NULL;
1339 }
1340 }
1341
1342 if (!x)
1343 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1344 if_id, p->info.id.proto, daddr,
1345 &p->info.saddr, 1,
1346 family);
1347 err = -ENOENT;
1348 if (x == NULL)
1349 goto out_noput;
1350
1351 err = xfrm_alloc_spi(x, p->min, p->max);
1352 if (err)
1353 goto out;
1354
1355 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1356 if (IS_ERR(resp_skb)) {
1357 err = PTR_ERR(resp_skb);
1358 goto out;
1359 }
1360
1361 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1362
1363out:
1364 xfrm_state_put(x);
1365out_noput:
1366 return err;
1367}
1368
1369static int verify_policy_dir(u8 dir)
1370{
1371 switch (dir) {
1372 case XFRM_POLICY_IN:
1373 case XFRM_POLICY_OUT:
1374 case XFRM_POLICY_FWD:
1375 break;
1376
1377 default:
1378 return -EINVAL;
1379 }
1380
1381 return 0;
1382}
1383
1384static int verify_policy_type(u8 type)
1385{
1386 switch (type) {
1387 case XFRM_POLICY_TYPE_MAIN:
1388#ifdef CONFIG_XFRM_SUB_POLICY
1389 case XFRM_POLICY_TYPE_SUB:
1390#endif
1391 break;
1392
1393 default:
1394 return -EINVAL;
1395 }
1396
1397 return 0;
1398}
1399
1400static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1401{
1402 int ret;
1403
1404 switch (p->share) {
1405 case XFRM_SHARE_ANY:
1406 case XFRM_SHARE_SESSION:
1407 case XFRM_SHARE_USER:
1408 case XFRM_SHARE_UNIQUE:
1409 break;
1410
1411 default:
1412 return -EINVAL;
1413 }
1414
1415 switch (p->action) {
1416 case XFRM_POLICY_ALLOW:
1417 case XFRM_POLICY_BLOCK:
1418 break;
1419
1420 default:
1421 return -EINVAL;
1422 }
1423
1424 switch (p->sel.family) {
1425 case AF_INET:
1426 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1427 return -EINVAL;
1428
1429 break;
1430
1431 case AF_INET6:
1432#if IS_ENABLED(CONFIG_IPV6)
1433 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1434 return -EINVAL;
1435
1436 break;
1437#else
1438 return -EAFNOSUPPORT;
1439#endif
1440
1441 default:
1442 return -EINVAL;
1443 }
1444
1445 ret = verify_policy_dir(p->dir);
1446 if (ret)
1447 return ret;
1448 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1449 return -EINVAL;
1450
1451 return 0;
1452}
1453
1454static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1455{
1456 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1457 struct xfrm_user_sec_ctx *uctx;
1458
1459 if (!rt)
1460 return 0;
1461
1462 uctx = nla_data(rt);
1463 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1464}
1465
1466static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1467 int nr)
1468{
1469 int i;
1470
1471 xp->xfrm_nr = nr;
1472 for (i = 0; i < nr; i++, ut++) {
1473 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1474
1475 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1476 memcpy(&t->saddr, &ut->saddr,
1477 sizeof(xfrm_address_t));
1478 t->reqid = ut->reqid;
1479 t->mode = ut->mode;
1480 t->share = ut->share;
1481 t->optional = ut->optional;
1482 t->aalgos = ut->aalgos;
1483 t->ealgos = ut->ealgos;
1484 t->calgos = ut->calgos;
1485 /* If all masks are ~0, then we allow all algorithms. */
1486 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1487 t->encap_family = ut->family;
1488 }
1489}
1490
1491static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1492{
1493 u16 prev_family;
1494 int i;
1495
1496 if (nr > XFRM_MAX_DEPTH)
1497 return -EINVAL;
1498
1499 prev_family = family;
1500
1501 for (i = 0; i < nr; i++) {
1502 /* We never validated the ut->family value, so many
1503 * applications simply leave it at zero. The check was
1504 * never made and ut->family was ignored because all
1505 * templates could be assumed to have the same family as
1506 * the policy itself. Now that we will have ipv4-in-ipv6
1507 * and ipv6-in-ipv4 tunnels, this is no longer true.
1508 */
1509 if (!ut[i].family)
1510 ut[i].family = family;
1511
1512 switch (ut[i].mode) {
1513 case XFRM_MODE_TUNNEL:
1514 case XFRM_MODE_BEET:
1515 break;
1516 default:
1517 if (ut[i].family != prev_family)
1518 return -EINVAL;
1519 break;
1520 }
1521 if (ut[i].mode >= XFRM_MODE_MAX)
1522 return -EINVAL;
1523
1524 prev_family = ut[i].family;
1525
1526 switch (ut[i].family) {
1527 case AF_INET:
1528 break;
1529#if IS_ENABLED(CONFIG_IPV6)
1530 case AF_INET6:
1531 break;
1532#endif
1533 default:
1534 return -EINVAL;
1535 }
1536
1537 if (!xfrm_id_proto_valid(ut[i].id.proto))
1538 return -EINVAL;
1539 }
1540
1541 return 0;
1542}
1543
1544static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1545{
1546 struct nlattr *rt = attrs[XFRMA_TMPL];
1547
1548 if (!rt) {
1549 pol->xfrm_nr = 0;
1550 } else {
1551 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1552 int nr = nla_len(rt) / sizeof(*utmpl);
1553 int err;
1554
1555 err = validate_tmpl(nr, utmpl, pol->family);
1556 if (err)
1557 return err;
1558
1559 copy_templates(pol, utmpl, nr);
1560 }
1561 return 0;
1562}
1563
1564static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1565{
1566 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1567 struct xfrm_userpolicy_type *upt;
1568 u8 type = XFRM_POLICY_TYPE_MAIN;
1569 int err;
1570
1571 if (rt) {
1572 upt = nla_data(rt);
1573 type = upt->type;
1574 }
1575
1576 err = verify_policy_type(type);
1577 if (err)
1578 return err;
1579
1580 *tp = type;
1581 return 0;
1582}
1583
1584static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1585{
1586 xp->priority = p->priority;
1587 xp->index = p->index;
1588 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1589 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1590 xp->action = p->action;
1591 xp->flags = p->flags;
1592 xp->family = p->sel.family;
1593 /* XXX xp->share = p->share; */
1594}
1595
1596static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1597{
1598 memset(p, 0, sizeof(*p));
1599 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1600 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1601 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1602 p->priority = xp->priority;
1603 p->index = xp->index;
1604 p->sel.family = xp->family;
1605 p->dir = dir;
1606 p->action = xp->action;
1607 p->flags = xp->flags;
1608 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1609}
1610
1611static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1612{
1613 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1614 int err;
1615
1616 if (!xp) {
1617 *errp = -ENOMEM;
1618 return NULL;
1619 }
1620
1621 copy_from_user_policy(xp, p);
1622
1623 err = copy_from_user_policy_type(&xp->type, attrs);
1624 if (err)
1625 goto error;
1626
1627 if (!(err = copy_from_user_tmpl(xp, attrs)))
1628 err = copy_from_user_sec_ctx(xp, attrs);
1629 if (err)
1630 goto error;
1631
1632 xfrm_mark_get(attrs, &xp->mark);
1633
1634 if (attrs[XFRMA_IF_ID])
1635 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1636
1637 return xp;
1638 error:
1639 *errp = err;
1640 xp->walk.dead = 1;
1641 xfrm_policy_destroy(xp);
1642 return NULL;
1643}
1644
1645static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1646 struct nlattr **attrs)
1647{
1648 struct net *net = sock_net(skb->sk);
1649 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1650 struct xfrm_policy *xp;
1651 struct km_event c;
1652 int err;
1653 int excl;
1654
1655 err = verify_newpolicy_info(p);
1656 if (err)
1657 return err;
1658 err = verify_sec_ctx_len(attrs);
1659 if (err)
1660 return err;
1661
1662 xp = xfrm_policy_construct(net, p, attrs, &err);
1663 if (!xp)
1664 return err;
1665
1666 /* shouldn't excl be based on nlh flags??
1667 * Aha! this is anti-netlink really i.e more pfkey derived
1668 * in netlink excl is a flag and you wouldnt need
1669 * a type XFRM_MSG_UPDPOLICY - JHS */
1670 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1671 err = xfrm_policy_insert(p->dir, xp, excl);
1672 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1673
1674 if (err) {
1675 security_xfrm_policy_free(xp->security);
1676 kfree(xp);
1677 return err;
1678 }
1679
1680 c.event = nlh->nlmsg_type;
1681 c.seq = nlh->nlmsg_seq;
1682 c.portid = nlh->nlmsg_pid;
1683 km_policy_notify(xp, p->dir, &c);
1684
1685 xfrm_pol_put(xp);
1686
1687 return 0;
1688}
1689
1690static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1691{
1692 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1693 int i;
1694
1695 if (xp->xfrm_nr == 0)
1696 return 0;
1697
1698 for (i = 0; i < xp->xfrm_nr; i++) {
1699 struct xfrm_user_tmpl *up = &vec[i];
1700 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1701
1702 memset(up, 0, sizeof(*up));
1703 memcpy(&up->id, &kp->id, sizeof(up->id));
1704 up->family = kp->encap_family;
1705 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1706 up->reqid = kp->reqid;
1707 up->mode = kp->mode;
1708 up->share = kp->share;
1709 up->optional = kp->optional;
1710 up->aalgos = kp->aalgos;
1711 up->ealgos = kp->ealgos;
1712 up->calgos = kp->calgos;
1713 }
1714
1715 return nla_put(skb, XFRMA_TMPL,
1716 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1717}
1718
1719static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1720{
1721 if (x->security) {
1722 return copy_sec_ctx(x->security, skb);
1723 }
1724 return 0;
1725}
1726
1727static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1728{
1729 if (xp->security)
1730 return copy_sec_ctx(xp->security, skb);
1731 return 0;
1732}
1733static inline unsigned int userpolicy_type_attrsize(void)
1734{
1735#ifdef CONFIG_XFRM_SUB_POLICY
1736 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1737#else
1738 return 0;
1739#endif
1740}
1741
1742#ifdef CONFIG_XFRM_SUB_POLICY
1743static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1744{
1745 struct xfrm_userpolicy_type upt;
1746
1747 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1748 memset(&upt, 0, sizeof(upt));
1749 upt.type = type;
1750
1751 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1752}
1753
1754#else
1755static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1756{
1757 return 0;
1758}
1759#endif
1760
1761static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1762{
1763 struct xfrm_dump_info *sp = ptr;
1764 struct xfrm_userpolicy_info *p;
1765 struct sk_buff *in_skb = sp->in_skb;
1766 struct sk_buff *skb = sp->out_skb;
1767 struct nlmsghdr *nlh;
1768 int err;
1769
1770 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1771 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1772 if (nlh == NULL)
1773 return -EMSGSIZE;
1774
1775 p = nlmsg_data(nlh);
1776 copy_to_user_policy(xp, p, dir);
1777 err = copy_to_user_tmpl(xp, skb);
1778 if (!err)
1779 err = copy_to_user_sec_ctx(xp, skb);
1780 if (!err)
1781 err = copy_to_user_policy_type(xp->type, skb);
1782 if (!err)
1783 err = xfrm_mark_put(skb, &xp->mark);
1784 if (!err)
1785 err = xfrm_if_id_put(skb, xp->if_id);
1786 if (err) {
1787 nlmsg_cancel(skb, nlh);
1788 return err;
1789 }
1790 nlmsg_end(skb, nlh);
1791 return 0;
1792}
1793
1794static int xfrm_dump_policy_done(struct netlink_callback *cb)
1795{
1796 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1797 struct net *net = sock_net(cb->skb->sk);
1798
1799 xfrm_policy_walk_done(walk, net);
1800 return 0;
1801}
1802
1803static int xfrm_dump_policy_start(struct netlink_callback *cb)
1804{
1805 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1806
1807 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1808
1809 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1810 return 0;
1811}
1812
1813static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1814{
1815 struct net *net = sock_net(skb->sk);
1816 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1817 struct xfrm_dump_info info;
1818
1819 info.in_skb = cb->skb;
1820 info.out_skb = skb;
1821 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1822 info.nlmsg_flags = NLM_F_MULTI;
1823
1824 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1825
1826 return skb->len;
1827}
1828
1829static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1830 struct xfrm_policy *xp,
1831 int dir, u32 seq)
1832{
1833 struct xfrm_dump_info info;
1834 struct sk_buff *skb;
1835 int err;
1836
1837 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1838 if (!skb)
1839 return ERR_PTR(-ENOMEM);
1840
1841 info.in_skb = in_skb;
1842 info.out_skb = skb;
1843 info.nlmsg_seq = seq;
1844 info.nlmsg_flags = 0;
1845
1846 err = dump_one_policy(xp, dir, 0, &info);
1847 if (err) {
1848 kfree_skb(skb);
1849 return ERR_PTR(err);
1850 }
1851
1852 return skb;
1853}
1854
1855static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1856 struct nlattr **attrs)
1857{
1858 struct net *net = sock_net(skb->sk);
1859 struct xfrm_policy *xp;
1860 struct xfrm_userpolicy_id *p;
1861 u8 type = XFRM_POLICY_TYPE_MAIN;
1862 int err;
1863 struct km_event c;
1864 int delete;
1865 struct xfrm_mark m;
1866 u32 if_id = 0;
1867
1868 p = nlmsg_data(nlh);
1869 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1870
1871 err = copy_from_user_policy_type(&type, attrs);
1872 if (err)
1873 return err;
1874
1875 err = verify_policy_dir(p->dir);
1876 if (err)
1877 return err;
1878
1879 if (attrs[XFRMA_IF_ID])
1880 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1881
1882 xfrm_mark_get(attrs, &m);
1883
1884 if (p->index)
1885 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
1886 p->index, delete, &err);
1887 else {
1888 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1889 struct xfrm_sec_ctx *ctx;
1890
1891 err = verify_sec_ctx_len(attrs);
1892 if (err)
1893 return err;
1894
1895 ctx = NULL;
1896 if (rt) {
1897 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1898
1899 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1900 if (err)
1901 return err;
1902 }
1903 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
1904 &p->sel, ctx, delete, &err);
1905 security_xfrm_policy_free(ctx);
1906 }
1907 if (xp == NULL)
1908 return -ENOENT;
1909
1910 if (!delete) {
1911 struct sk_buff *resp_skb;
1912
1913 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1914 if (IS_ERR(resp_skb)) {
1915 err = PTR_ERR(resp_skb);
1916 } else {
1917 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1918 NETLINK_CB(skb).portid);
1919 }
1920 } else {
1921 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1922
1923 if (err != 0)
1924 goto out;
1925
1926 c.data.byid = p->index;
1927 c.event = nlh->nlmsg_type;
1928 c.seq = nlh->nlmsg_seq;
1929 c.portid = nlh->nlmsg_pid;
1930 km_policy_notify(xp, p->dir, &c);
1931 }
1932
1933out:
1934 xfrm_pol_put(xp);
1935 return err;
1936}
1937
1938static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1939 struct nlattr **attrs)
1940{
1941 struct net *net = sock_net(skb->sk);
1942 struct km_event c;
1943 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1944 int err;
1945
1946 err = xfrm_state_flush(net, p->proto, true, false);
1947 if (err) {
1948 if (err == -ESRCH) /* empty table */
1949 return 0;
1950 return err;
1951 }
1952 c.data.proto = p->proto;
1953 c.event = nlh->nlmsg_type;
1954 c.seq = nlh->nlmsg_seq;
1955 c.portid = nlh->nlmsg_pid;
1956 c.net = net;
1957 km_state_notify(NULL, &c);
1958
1959 return 0;
1960}
1961
1962static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1963{
1964 unsigned int replay_size = x->replay_esn ?
1965 xfrm_replay_state_esn_len(x->replay_esn) :
1966 sizeof(struct xfrm_replay_state);
1967
1968 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1969 + nla_total_size(replay_size)
1970 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1971 + nla_total_size(sizeof(struct xfrm_mark))
1972 + nla_total_size(4) /* XFRM_AE_RTHR */
1973 + nla_total_size(4); /* XFRM_AE_ETHR */
1974}
1975
1976static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1977{
1978 struct xfrm_aevent_id *id;
1979 struct nlmsghdr *nlh;
1980 int err;
1981
1982 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1983 if (nlh == NULL)
1984 return -EMSGSIZE;
1985
1986 id = nlmsg_data(nlh);
1987 memset(&id->sa_id, 0, sizeof(id->sa_id));
1988 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1989 id->sa_id.spi = x->id.spi;
1990 id->sa_id.family = x->props.family;
1991 id->sa_id.proto = x->id.proto;
1992 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1993 id->reqid = x->props.reqid;
1994 id->flags = c->data.aevent;
1995
1996 if (x->replay_esn) {
1997 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1998 xfrm_replay_state_esn_len(x->replay_esn),
1999 x->replay_esn);
2000 } else {
2001 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2002 &x->replay);
2003 }
2004 if (err)
2005 goto out_cancel;
2006 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2007 XFRMA_PAD);
2008 if (err)
2009 goto out_cancel;
2010
2011 if (id->flags & XFRM_AE_RTHR) {
2012 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2013 if (err)
2014 goto out_cancel;
2015 }
2016 if (id->flags & XFRM_AE_ETHR) {
2017 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2018 x->replay_maxage * 10 / HZ);
2019 if (err)
2020 goto out_cancel;
2021 }
2022 err = xfrm_mark_put(skb, &x->mark);
2023 if (err)
2024 goto out_cancel;
2025
2026 err = xfrm_if_id_put(skb, x->if_id);
2027 if (err)
2028 goto out_cancel;
2029
2030 nlmsg_end(skb, nlh);
2031 return 0;
2032
2033out_cancel:
2034 nlmsg_cancel(skb, nlh);
2035 return err;
2036}
2037
2038static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2039 struct nlattr **attrs)
2040{
2041 struct net *net = sock_net(skb->sk);
2042 struct xfrm_state *x;
2043 struct sk_buff *r_skb;
2044 int err;
2045 struct km_event c;
2046 u32 mark;
2047 struct xfrm_mark m;
2048 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2049 struct xfrm_usersa_id *id = &p->sa_id;
2050
2051 mark = xfrm_mark_get(attrs, &m);
2052
2053 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2054 if (x == NULL)
2055 return -ESRCH;
2056
2057 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2058 if (r_skb == NULL) {
2059 xfrm_state_put(x);
2060 return -ENOMEM;
2061 }
2062
2063 /*
2064 * XXX: is this lock really needed - none of the other
2065 * gets lock (the concern is things getting updated
2066 * while we are still reading) - jhs
2067 */
2068 spin_lock_bh(&x->lock);
2069 c.data.aevent = p->flags;
2070 c.seq = nlh->nlmsg_seq;
2071 c.portid = nlh->nlmsg_pid;
2072
2073 err = build_aevent(r_skb, x, &c);
2074 BUG_ON(err < 0);
2075
2076 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2077 spin_unlock_bh(&x->lock);
2078 xfrm_state_put(x);
2079 return err;
2080}
2081
2082static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2083 struct nlattr **attrs)
2084{
2085 struct net *net = sock_net(skb->sk);
2086 struct xfrm_state *x;
2087 struct km_event c;
2088 int err = -EINVAL;
2089 u32 mark = 0;
2090 struct xfrm_mark m;
2091 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2092 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2093 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2094 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2095 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2096 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2097
2098 if (!lt && !rp && !re && !et && !rt)
2099 return err;
2100
2101 /* pedantic mode - thou shalt sayeth replaceth */
2102 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2103 return err;
2104
2105 mark = xfrm_mark_get(attrs, &m);
2106
2107 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2108 if (x == NULL)
2109 return -ESRCH;
2110
2111 if (x->km.state != XFRM_STATE_VALID)
2112 goto out;
2113
2114 err = xfrm_replay_verify_len(x->replay_esn, re);
2115 if (err)
2116 goto out;
2117
2118 spin_lock_bh(&x->lock);
2119 xfrm_update_ae_params(x, attrs, 1);
2120 spin_unlock_bh(&x->lock);
2121
2122 c.event = nlh->nlmsg_type;
2123 c.seq = nlh->nlmsg_seq;
2124 c.portid = nlh->nlmsg_pid;
2125 c.data.aevent = XFRM_AE_CU;
2126 km_state_notify(x, &c);
2127 err = 0;
2128out:
2129 xfrm_state_put(x);
2130 return err;
2131}
2132
2133static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2134 struct nlattr **attrs)
2135{
2136 struct net *net = sock_net(skb->sk);
2137 struct km_event c;
2138 u8 type = XFRM_POLICY_TYPE_MAIN;
2139 int err;
2140
2141 err = copy_from_user_policy_type(&type, attrs);
2142 if (err)
2143 return err;
2144
2145 err = xfrm_policy_flush(net, type, true);
2146 if (err) {
2147 if (err == -ESRCH) /* empty table */
2148 return 0;
2149 return err;
2150 }
2151
2152 c.data.type = type;
2153 c.event = nlh->nlmsg_type;
2154 c.seq = nlh->nlmsg_seq;
2155 c.portid = nlh->nlmsg_pid;
2156 c.net = net;
2157 km_policy_notify(NULL, 0, &c);
2158 return 0;
2159}
2160
2161static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2162 struct nlattr **attrs)
2163{
2164 struct net *net = sock_net(skb->sk);
2165 struct xfrm_policy *xp;
2166 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2167 struct xfrm_userpolicy_info *p = &up->pol;
2168 u8 type = XFRM_POLICY_TYPE_MAIN;
2169 int err = -ENOENT;
2170 struct xfrm_mark m;
2171 u32 if_id = 0;
2172
2173 err = copy_from_user_policy_type(&type, attrs);
2174 if (err)
2175 return err;
2176
2177 err = verify_policy_dir(p->dir);
2178 if (err)
2179 return err;
2180
2181 if (attrs[XFRMA_IF_ID])
2182 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2183
2184 xfrm_mark_get(attrs, &m);
2185
2186 if (p->index)
2187 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2188 0, &err);
2189 else {
2190 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2191 struct xfrm_sec_ctx *ctx;
2192
2193 err = verify_sec_ctx_len(attrs);
2194 if (err)
2195 return err;
2196
2197 ctx = NULL;
2198 if (rt) {
2199 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2200
2201 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2202 if (err)
2203 return err;
2204 }
2205 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2206 &p->sel, ctx, 0, &err);
2207 security_xfrm_policy_free(ctx);
2208 }
2209 if (xp == NULL)
2210 return -ENOENT;
2211
2212 if (unlikely(xp->walk.dead))
2213 goto out;
2214
2215 err = 0;
2216 if (up->hard) {
2217 xfrm_policy_delete(xp, p->dir);
2218 xfrm_audit_policy_delete(xp, 1, true);
2219 }
2220 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2221
2222out:
2223 xfrm_pol_put(xp);
2224 return err;
2225}
2226
2227static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2228 struct nlattr **attrs)
2229{
2230 struct net *net = sock_net(skb->sk);
2231 struct xfrm_state *x;
2232 int err;
2233 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2234 struct xfrm_usersa_info *p = &ue->state;
2235 struct xfrm_mark m;
2236 u32 mark = xfrm_mark_get(attrs, &m);
2237
2238 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2239
2240 err = -ENOENT;
2241 if (x == NULL)
2242 return err;
2243
2244 spin_lock_bh(&x->lock);
2245 err = -EINVAL;
2246 if (x->km.state != XFRM_STATE_VALID)
2247 goto out;
2248 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2249
2250 if (ue->hard) {
2251 __xfrm_state_delete(x);
2252 xfrm_audit_state_delete(x, 1, true);
2253 }
2254 err = 0;
2255out:
2256 spin_unlock_bh(&x->lock);
2257 xfrm_state_put(x);
2258 return err;
2259}
2260
2261static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2262 struct nlattr **attrs)
2263{
2264 struct net *net = sock_net(skb->sk);
2265 struct xfrm_policy *xp;
2266 struct xfrm_user_tmpl *ut;
2267 int i;
2268 struct nlattr *rt = attrs[XFRMA_TMPL];
2269 struct xfrm_mark mark;
2270
2271 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2272 struct xfrm_state *x = xfrm_state_alloc(net);
2273 int err = -ENOMEM;
2274
2275 if (!x)
2276 goto nomem;
2277
2278 xfrm_mark_get(attrs, &mark);
2279
2280 err = verify_newpolicy_info(&ua->policy);
2281 if (err)
2282 goto free_state;
2283 err = verify_sec_ctx_len(attrs);
2284 if (err)
2285 goto free_state;
2286
2287 /* build an XP */
2288 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2289 if (!xp)
2290 goto free_state;
2291
2292 memcpy(&x->id, &ua->id, sizeof(ua->id));
2293 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2294 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2295 xp->mark.m = x->mark.m = mark.m;
2296 xp->mark.v = x->mark.v = mark.v;
2297 ut = nla_data(rt);
2298 /* extract the templates and for each call km_key */
2299 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2300 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2301 memcpy(&x->id, &t->id, sizeof(x->id));
2302 x->props.mode = t->mode;
2303 x->props.reqid = t->reqid;
2304 x->props.family = ut->family;
2305 t->aalgos = ua->aalgos;
2306 t->ealgos = ua->ealgos;
2307 t->calgos = ua->calgos;
2308 err = km_query(x, t, xp);
2309
2310 }
2311
2312 xfrm_state_free(x);
2313 kfree(xp);
2314
2315 return 0;
2316
2317free_state:
2318 xfrm_state_free(x);
2319nomem:
2320 return err;
2321}
2322
2323#ifdef CONFIG_XFRM_MIGRATE
2324static int copy_from_user_migrate(struct xfrm_migrate *ma,
2325 struct xfrm_kmaddress *k,
2326 struct nlattr **attrs, int *num)
2327{
2328 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2329 struct xfrm_user_migrate *um;
2330 int i, num_migrate;
2331
2332 if (k != NULL) {
2333 struct xfrm_user_kmaddress *uk;
2334
2335 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2336 memcpy(&k->local, &uk->local, sizeof(k->local));
2337 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2338 k->family = uk->family;
2339 k->reserved = uk->reserved;
2340 }
2341
2342 um = nla_data(rt);
2343 num_migrate = nla_len(rt) / sizeof(*um);
2344
2345 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2346 return -EINVAL;
2347
2348 for (i = 0; i < num_migrate; i++, um++, ma++) {
2349 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2350 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2351 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2352 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2353
2354 ma->proto = um->proto;
2355 ma->mode = um->mode;
2356 ma->reqid = um->reqid;
2357
2358 ma->old_family = um->old_family;
2359 ma->new_family = um->new_family;
2360 }
2361
2362 *num = i;
2363 return 0;
2364}
2365
2366static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2367 struct nlattr **attrs)
2368{
2369 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2370 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2371 struct xfrm_kmaddress km, *kmp;
2372 u8 type;
2373 int err;
2374 int n = 0;
2375 struct net *net = sock_net(skb->sk);
2376 struct xfrm_encap_tmpl *encap = NULL;
2377
2378 if (attrs[XFRMA_MIGRATE] == NULL)
2379 return -EINVAL;
2380
2381 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2382
2383 err = copy_from_user_policy_type(&type, attrs);
2384 if (err)
2385 return err;
2386
2387 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2388 if (err)
2389 return err;
2390
2391 if (!n)
2392 return 0;
2393
2394 if (attrs[XFRMA_ENCAP]) {
2395 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2396 sizeof(*encap), GFP_KERNEL);
2397 if (!encap)
2398 return 0;
2399 }
2400
2401 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2402
2403 kfree(encap);
2404
2405 return err;
2406}
2407#else
2408static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2409 struct nlattr **attrs)
2410{
2411 return -ENOPROTOOPT;
2412}
2413#endif
2414
2415#ifdef CONFIG_XFRM_MIGRATE
2416static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2417{
2418 struct xfrm_user_migrate um;
2419
2420 memset(&um, 0, sizeof(um));
2421 um.proto = m->proto;
2422 um.mode = m->mode;
2423 um.reqid = m->reqid;
2424 um.old_family = m->old_family;
2425 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2426 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2427 um.new_family = m->new_family;
2428 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2429 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2430
2431 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2432}
2433
2434static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2435{
2436 struct xfrm_user_kmaddress uk;
2437
2438 memset(&uk, 0, sizeof(uk));
2439 uk.family = k->family;
2440 uk.reserved = k->reserved;
2441 memcpy(&uk.local, &k->local, sizeof(uk.local));
2442 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2443
2444 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2445}
2446
2447static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2448 int with_encp)
2449{
2450 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2451 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2452 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2453 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2454 + userpolicy_type_attrsize();
2455}
2456
2457static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2458 int num_migrate, const struct xfrm_kmaddress *k,
2459 const struct xfrm_selector *sel,
2460 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2461{
2462 const struct xfrm_migrate *mp;
2463 struct xfrm_userpolicy_id *pol_id;
2464 struct nlmsghdr *nlh;
2465 int i, err;
2466
2467 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2468 if (nlh == NULL)
2469 return -EMSGSIZE;
2470
2471 pol_id = nlmsg_data(nlh);
2472 /* copy data from selector, dir, and type to the pol_id */
2473 memset(pol_id, 0, sizeof(*pol_id));
2474 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2475 pol_id->dir = dir;
2476
2477 if (k != NULL) {
2478 err = copy_to_user_kmaddress(k, skb);
2479 if (err)
2480 goto out_cancel;
2481 }
2482 if (encap) {
2483 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2484 if (err)
2485 goto out_cancel;
2486 }
2487 err = copy_to_user_policy_type(type, skb);
2488 if (err)
2489 goto out_cancel;
2490 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2491 err = copy_to_user_migrate(mp, skb);
2492 if (err)
2493 goto out_cancel;
2494 }
2495
2496 nlmsg_end(skb, nlh);
2497 return 0;
2498
2499out_cancel:
2500 nlmsg_cancel(skb, nlh);
2501 return err;
2502}
2503
2504static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2505 const struct xfrm_migrate *m, int num_migrate,
2506 const struct xfrm_kmaddress *k,
2507 const struct xfrm_encap_tmpl *encap)
2508{
2509 struct net *net = &init_net;
2510 struct sk_buff *skb;
2511 int err;
2512
2513 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2514 GFP_ATOMIC);
2515 if (skb == NULL)
2516 return -ENOMEM;
2517
2518 /* build migrate */
2519 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2520 BUG_ON(err < 0);
2521
2522 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2523}
2524#else
2525static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2526 const struct xfrm_migrate *m, int num_migrate,
2527 const struct xfrm_kmaddress *k,
2528 const struct xfrm_encap_tmpl *encap)
2529{
2530 return -ENOPROTOOPT;
2531}
2532#endif
2533
2534#define XMSGSIZE(type) sizeof(struct type)
2535
2536static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2537 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2538 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2539 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2540 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2541 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2542 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2543 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2544 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2545 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2546 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2547 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2548 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2549 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2550 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2551 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2552 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2553 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2554 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2555 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2556 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2557 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2558};
2559
2560#undef XMSGSIZE
2561
2562static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2563 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2564 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2565 [XFRMA_LASTUSED] = { .type = NLA_U64},
2566 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2567 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2568 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2569 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2570 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2571 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2572 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2573 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2574 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2575 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2576 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2577 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2578 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2579 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2580 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2581 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2582 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2583 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2584 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2585 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2586 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2587 [XFRMA_PROTO] = { .type = NLA_U8 },
2588 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2589 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2590 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2591 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2592 [XFRMA_IF_ID] = { .type = NLA_U32 },
2593};
2594
2595static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2596 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2597 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2598};
2599
2600static const struct xfrm_link {
2601 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2602 int (*start)(struct netlink_callback *);
2603 int (*dump)(struct sk_buff *, struct netlink_callback *);
2604 int (*done)(struct netlink_callback *);
2605 const struct nla_policy *nla_pol;
2606 int nla_max;
2607} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2608 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2609 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2610 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2611 .dump = xfrm_dump_sa,
2612 .done = xfrm_dump_sa_done },
2613 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2614 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2615 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2616 .start = xfrm_dump_policy_start,
2617 .dump = xfrm_dump_policy,
2618 .done = xfrm_dump_policy_done },
2619 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2620 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2621 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2622 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2623 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2624 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2625 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2626 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2627 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2628 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2629 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2630 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2631 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2632 .nla_pol = xfrma_spd_policy,
2633 .nla_max = XFRMA_SPD_MAX },
2634 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2635};
2636
2637static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2638 struct netlink_ext_ack *extack)
2639{
2640 struct net *net = sock_net(skb->sk);
2641 struct nlattr *attrs[XFRMA_MAX+1];
2642 const struct xfrm_link *link;
2643 int type, err;
2644
2645 if (in_compat_syscall())
2646 return -EOPNOTSUPP;
2647
2648 type = nlh->nlmsg_type;
2649 if (type > XFRM_MSG_MAX)
2650 return -EINVAL;
2651
2652 type -= XFRM_MSG_BASE;
2653 link = &xfrm_dispatch[type];
2654
2655 /* All operations require privileges, even GET */
2656 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2657 return -EPERM;
2658
2659 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2660 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2661 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2662 if (link->dump == NULL)
2663 return -EINVAL;
2664
2665 {
2666 struct netlink_dump_control c = {
2667 .start = link->start,
2668 .dump = link->dump,
2669 .done = link->done,
2670 };
2671 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2672 }
2673 }
2674
2675 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2676 link->nla_max ? : XFRMA_MAX,
2677 link->nla_pol ? : xfrma_policy, extack);
2678 if (err < 0)
2679 return err;
2680
2681 if (link->doit == NULL)
2682 return -EINVAL;
2683
2684 return link->doit(skb, nlh, attrs);
2685}
2686
2687static void xfrm_netlink_rcv(struct sk_buff *skb)
2688{
2689 struct net *net = sock_net(skb->sk);
2690
2691 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2692 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2693 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2694}
2695
2696static inline unsigned int xfrm_expire_msgsize(void)
2697{
2698 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2699 + nla_total_size(sizeof(struct xfrm_mark));
2700}
2701
2702static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2703{
2704 struct xfrm_user_expire *ue;
2705 struct nlmsghdr *nlh;
2706 int err;
2707
2708 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2709 if (nlh == NULL)
2710 return -EMSGSIZE;
2711
2712 ue = nlmsg_data(nlh);
2713 copy_to_user_state(x, &ue->state);
2714 ue->hard = (c->data.hard != 0) ? 1 : 0;
2715 /* clear the padding bytes */
2716 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2717
2718 err = xfrm_mark_put(skb, &x->mark);
2719 if (err)
2720 return err;
2721
2722 err = xfrm_if_id_put(skb, x->if_id);
2723 if (err)
2724 return err;
2725
2726 nlmsg_end(skb, nlh);
2727 return 0;
2728}
2729
2730static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2731{
2732 struct net *net = xs_net(x);
2733 struct sk_buff *skb;
2734
2735 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2736 if (skb == NULL)
2737 return -ENOMEM;
2738
2739 if (build_expire(skb, x, c) < 0) {
2740 kfree_skb(skb);
2741 return -EMSGSIZE;
2742 }
2743
2744 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2745}
2746
2747static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2748{
2749 struct net *net = xs_net(x);
2750 struct sk_buff *skb;
2751 int err;
2752
2753 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2754 if (skb == NULL)
2755 return -ENOMEM;
2756
2757 err = build_aevent(skb, x, c);
2758 BUG_ON(err < 0);
2759
2760 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2761}
2762
2763static int xfrm_notify_sa_flush(const struct km_event *c)
2764{
2765 struct net *net = c->net;
2766 struct xfrm_usersa_flush *p;
2767 struct nlmsghdr *nlh;
2768 struct sk_buff *skb;
2769 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2770
2771 skb = nlmsg_new(len, GFP_ATOMIC);
2772 if (skb == NULL)
2773 return -ENOMEM;
2774
2775 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2776 if (nlh == NULL) {
2777 kfree_skb(skb);
2778 return -EMSGSIZE;
2779 }
2780
2781 p = nlmsg_data(nlh);
2782 p->proto = c->data.proto;
2783
2784 nlmsg_end(skb, nlh);
2785
2786 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2787}
2788
2789static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2790{
2791 unsigned int l = 0;
2792 if (x->aead)
2793 l += nla_total_size(aead_len(x->aead));
2794 if (x->aalg) {
2795 l += nla_total_size(sizeof(struct xfrm_algo) +
2796 (x->aalg->alg_key_len + 7) / 8);
2797 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2798 }
2799 if (x->ealg)
2800 l += nla_total_size(xfrm_alg_len(x->ealg));
2801 if (x->calg)
2802 l += nla_total_size(sizeof(*x->calg));
2803 if (x->encap)
2804 l += nla_total_size(sizeof(*x->encap));
2805 if (x->tfcpad)
2806 l += nla_total_size(sizeof(x->tfcpad));
2807 if (x->replay_esn)
2808 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2809 else
2810 l += nla_total_size(sizeof(struct xfrm_replay_state));
2811 if (x->security)
2812 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2813 x->security->ctx_len);
2814 if (x->coaddr)
2815 l += nla_total_size(sizeof(*x->coaddr));
2816 if (x->props.extra_flags)
2817 l += nla_total_size(sizeof(x->props.extra_flags));
2818 if (x->xso.dev)
2819 l += nla_total_size(sizeof(x->xso));
2820 if (x->props.smark.v | x->props.smark.m) {
2821 l += nla_total_size(sizeof(x->props.smark.v));
2822 l += nla_total_size(sizeof(x->props.smark.m));
2823 }
2824 if (x->if_id)
2825 l += nla_total_size(sizeof(x->if_id));
2826
2827 /* Must count x->lastused as it may become non-zero behind our back. */
2828 l += nla_total_size_64bit(sizeof(u64));
2829
2830 return l;
2831}
2832
2833static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2834{
2835 struct net *net = xs_net(x);
2836 struct xfrm_usersa_info *p;
2837 struct xfrm_usersa_id *id;
2838 struct nlmsghdr *nlh;
2839 struct sk_buff *skb;
2840 unsigned int len = xfrm_sa_len(x);
2841 unsigned int headlen;
2842 int err;
2843
2844 headlen = sizeof(*p);
2845 if (c->event == XFRM_MSG_DELSA) {
2846 len += nla_total_size(headlen);
2847 headlen = sizeof(*id);
2848 len += nla_total_size(sizeof(struct xfrm_mark));
2849 }
2850 len += NLMSG_ALIGN(headlen);
2851
2852 skb = nlmsg_new(len, GFP_ATOMIC);
2853 if (skb == NULL)
2854 return -ENOMEM;
2855
2856 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2857 err = -EMSGSIZE;
2858 if (nlh == NULL)
2859 goto out_free_skb;
2860
2861 p = nlmsg_data(nlh);
2862 if (c->event == XFRM_MSG_DELSA) {
2863 struct nlattr *attr;
2864
2865 id = nlmsg_data(nlh);
2866 memset(id, 0, sizeof(*id));
2867 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2868 id->spi = x->id.spi;
2869 id->family = x->props.family;
2870 id->proto = x->id.proto;
2871
2872 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2873 err = -EMSGSIZE;
2874 if (attr == NULL)
2875 goto out_free_skb;
2876
2877 p = nla_data(attr);
2878 }
2879 err = copy_to_user_state_extra(x, p, skb);
2880 if (err)
2881 goto out_free_skb;
2882
2883 nlmsg_end(skb, nlh);
2884
2885 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2886
2887out_free_skb:
2888 kfree_skb(skb);
2889 return err;
2890}
2891
2892static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2893{
2894
2895 switch (c->event) {
2896 case XFRM_MSG_EXPIRE:
2897 return xfrm_exp_state_notify(x, c);
2898 case XFRM_MSG_NEWAE:
2899 return xfrm_aevent_state_notify(x, c);
2900 case XFRM_MSG_DELSA:
2901 case XFRM_MSG_UPDSA:
2902 case XFRM_MSG_NEWSA:
2903 return xfrm_notify_sa(x, c);
2904 case XFRM_MSG_FLUSHSA:
2905 return xfrm_notify_sa_flush(c);
2906 default:
2907 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2908 c->event);
2909 break;
2910 }
2911
2912 return 0;
2913
2914}
2915
2916static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2917 struct xfrm_policy *xp)
2918{
2919 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2920 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2921 + nla_total_size(sizeof(struct xfrm_mark))
2922 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2923 + userpolicy_type_attrsize();
2924}
2925
2926static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2927 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2928{
2929 __u32 seq = xfrm_get_acqseq();
2930 struct xfrm_user_acquire *ua;
2931 struct nlmsghdr *nlh;
2932 int err;
2933
2934 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2935 if (nlh == NULL)
2936 return -EMSGSIZE;
2937
2938 ua = nlmsg_data(nlh);
2939 memcpy(&ua->id, &x->id, sizeof(ua->id));
2940 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2941 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2942 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2943 ua->aalgos = xt->aalgos;
2944 ua->ealgos = xt->ealgos;
2945 ua->calgos = xt->calgos;
2946 ua->seq = x->km.seq = seq;
2947
2948 err = copy_to_user_tmpl(xp, skb);
2949 if (!err)
2950 err = copy_to_user_state_sec_ctx(x, skb);
2951 if (!err)
2952 err = copy_to_user_policy_type(xp->type, skb);
2953 if (!err)
2954 err = xfrm_mark_put(skb, &xp->mark);
2955 if (!err)
2956 err = xfrm_if_id_put(skb, xp->if_id);
2957 if (err) {
2958 nlmsg_cancel(skb, nlh);
2959 return err;
2960 }
2961
2962 nlmsg_end(skb, nlh);
2963 return 0;
2964}
2965
2966static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2967 struct xfrm_policy *xp)
2968{
2969 struct net *net = xs_net(x);
2970 struct sk_buff *skb;
2971 int err;
2972
2973 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2974 if (skb == NULL)
2975 return -ENOMEM;
2976
2977 err = build_acquire(skb, x, xt, xp);
2978 BUG_ON(err < 0);
2979
2980 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2981}
2982
2983/* User gives us xfrm_user_policy_info followed by an array of 0
2984 * or more templates.
2985 */
2986static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2987 u8 *data, int len, int *dir)
2988{
2989 struct net *net = sock_net(sk);
2990 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2991 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2992 struct xfrm_policy *xp;
2993 int nr;
2994
2995 switch (sk->sk_family) {
2996 case AF_INET:
2997 if (opt != IP_XFRM_POLICY) {
2998 *dir = -EOPNOTSUPP;
2999 return NULL;
3000 }
3001 break;
3002#if IS_ENABLED(CONFIG_IPV6)
3003 case AF_INET6:
3004 if (opt != IPV6_XFRM_POLICY) {
3005 *dir = -EOPNOTSUPP;
3006 return NULL;
3007 }
3008 break;
3009#endif
3010 default:
3011 *dir = -EINVAL;
3012 return NULL;
3013 }
3014
3015 *dir = -EINVAL;
3016
3017 if (len < sizeof(*p) ||
3018 verify_newpolicy_info(p))
3019 return NULL;
3020
3021 nr = ((len - sizeof(*p)) / sizeof(*ut));
3022 if (validate_tmpl(nr, ut, p->sel.family))
3023 return NULL;
3024
3025 if (p->dir > XFRM_POLICY_OUT)
3026 return NULL;
3027
3028 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3029 if (xp == NULL) {
3030 *dir = -ENOBUFS;
3031 return NULL;
3032 }
3033
3034 copy_from_user_policy(xp, p);
3035 xp->type = XFRM_POLICY_TYPE_MAIN;
3036 copy_templates(xp, ut, nr);
3037
3038 *dir = p->dir;
3039
3040 return xp;
3041}
3042
3043static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3044{
3045 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3046 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3047 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3048 + nla_total_size(sizeof(struct xfrm_mark))
3049 + userpolicy_type_attrsize();
3050}
3051
3052static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3053 int dir, const struct km_event *c)
3054{
3055 struct xfrm_user_polexpire *upe;
3056 int hard = c->data.hard;
3057 struct nlmsghdr *nlh;
3058 int err;
3059
3060 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3061 if (nlh == NULL)
3062 return -EMSGSIZE;
3063
3064 upe = nlmsg_data(nlh);
3065 copy_to_user_policy(xp, &upe->pol, dir);
3066 err = copy_to_user_tmpl(xp, skb);
3067 if (!err)
3068 err = copy_to_user_sec_ctx(xp, skb);
3069 if (!err)
3070 err = copy_to_user_policy_type(xp->type, skb);
3071 if (!err)
3072 err = xfrm_mark_put(skb, &xp->mark);
3073 if (!err)
3074 err = xfrm_if_id_put(skb, xp->if_id);
3075 if (err) {
3076 nlmsg_cancel(skb, nlh);
3077 return err;
3078 }
3079 upe->hard = !!hard;
3080
3081 nlmsg_end(skb, nlh);
3082 return 0;
3083}
3084
3085static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3086{
3087 struct net *net = xp_net(xp);
3088 struct sk_buff *skb;
3089 int err;
3090
3091 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3092 if (skb == NULL)
3093 return -ENOMEM;
3094
3095 err = build_polexpire(skb, xp, dir, c);
3096 BUG_ON(err < 0);
3097
3098 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3099}
3100
3101static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3102{
3103 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3104 struct net *net = xp_net(xp);
3105 struct xfrm_userpolicy_info *p;
3106 struct xfrm_userpolicy_id *id;
3107 struct nlmsghdr *nlh;
3108 struct sk_buff *skb;
3109 unsigned int headlen;
3110 int err;
3111
3112 headlen = sizeof(*p);
3113 if (c->event == XFRM_MSG_DELPOLICY) {
3114 len += nla_total_size(headlen);
3115 headlen = sizeof(*id);
3116 }
3117 len += userpolicy_type_attrsize();
3118 len += nla_total_size(sizeof(struct xfrm_mark));
3119 len += NLMSG_ALIGN(headlen);
3120
3121 skb = nlmsg_new(len, GFP_ATOMIC);
3122 if (skb == NULL)
3123 return -ENOMEM;
3124
3125 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3126 err = -EMSGSIZE;
3127 if (nlh == NULL)
3128 goto out_free_skb;
3129
3130 p = nlmsg_data(nlh);
3131 if (c->event == XFRM_MSG_DELPOLICY) {
3132 struct nlattr *attr;
3133
3134 id = nlmsg_data(nlh);
3135 memset(id, 0, sizeof(*id));
3136 id->dir = dir;
3137 if (c->data.byid)
3138 id->index = xp->index;
3139 else
3140 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3141
3142 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3143 err = -EMSGSIZE;
3144 if (attr == NULL)
3145 goto out_free_skb;
3146
3147 p = nla_data(attr);
3148 }
3149
3150 copy_to_user_policy(xp, p, dir);
3151 err = copy_to_user_tmpl(xp, skb);
3152 if (!err)
3153 err = copy_to_user_policy_type(xp->type, skb);
3154 if (!err)
3155 err = xfrm_mark_put(skb, &xp->mark);
3156 if (!err)
3157 err = xfrm_if_id_put(skb, xp->if_id);
3158 if (err)
3159 goto out_free_skb;
3160
3161 nlmsg_end(skb, nlh);
3162
3163 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3164
3165out_free_skb:
3166 kfree_skb(skb);
3167 return err;
3168}
3169
3170static int xfrm_notify_policy_flush(const struct km_event *c)
3171{
3172 struct net *net = c->net;
3173 struct nlmsghdr *nlh;
3174 struct sk_buff *skb;
3175 int err;
3176
3177 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3178 if (skb == NULL)
3179 return -ENOMEM;
3180
3181 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3182 err = -EMSGSIZE;
3183 if (nlh == NULL)
3184 goto out_free_skb;
3185 err = copy_to_user_policy_type(c->data.type, skb);
3186 if (err)
3187 goto out_free_skb;
3188
3189 nlmsg_end(skb, nlh);
3190
3191 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3192
3193out_free_skb:
3194 kfree_skb(skb);
3195 return err;
3196}
3197
3198static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3199{
3200
3201 switch (c->event) {
3202 case XFRM_MSG_NEWPOLICY:
3203 case XFRM_MSG_UPDPOLICY:
3204 case XFRM_MSG_DELPOLICY:
3205 return xfrm_notify_policy(xp, dir, c);
3206 case XFRM_MSG_FLUSHPOLICY:
3207 return xfrm_notify_policy_flush(c);
3208 case XFRM_MSG_POLEXPIRE:
3209 return xfrm_exp_policy_notify(xp, dir, c);
3210 default:
3211 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3212 c->event);
3213 }
3214
3215 return 0;
3216
3217}
3218
3219static inline unsigned int xfrm_report_msgsize(void)
3220{
3221 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3222}
3223
3224static int build_report(struct sk_buff *skb, u8 proto,
3225 struct xfrm_selector *sel, xfrm_address_t *addr)
3226{
3227 struct xfrm_user_report *ur;
3228 struct nlmsghdr *nlh;
3229
3230 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3231 if (nlh == NULL)
3232 return -EMSGSIZE;
3233
3234 ur = nlmsg_data(nlh);
3235 ur->proto = proto;
3236 memcpy(&ur->sel, sel, sizeof(ur->sel));
3237
3238 if (addr) {
3239 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3240 if (err) {
3241 nlmsg_cancel(skb, nlh);
3242 return err;
3243 }
3244 }
3245 nlmsg_end(skb, nlh);
3246 return 0;
3247}
3248
3249static int xfrm_send_report(struct net *net, u8 proto,
3250 struct xfrm_selector *sel, xfrm_address_t *addr)
3251{
3252 struct sk_buff *skb;
3253 int err;
3254
3255 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3256 if (skb == NULL)
3257 return -ENOMEM;
3258
3259 err = build_report(skb, proto, sel, addr);
3260 BUG_ON(err < 0);
3261
3262 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3263}
3264
3265static inline unsigned int xfrm_mapping_msgsize(void)
3266{
3267 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3268}
3269
3270static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3271 xfrm_address_t *new_saddr, __be16 new_sport)
3272{
3273 struct xfrm_user_mapping *um;
3274 struct nlmsghdr *nlh;
3275
3276 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3277 if (nlh == NULL)
3278 return -EMSGSIZE;
3279
3280 um = nlmsg_data(nlh);
3281
3282 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3283 um->id.spi = x->id.spi;
3284 um->id.family = x->props.family;
3285 um->id.proto = x->id.proto;
3286 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3287 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3288 um->new_sport = new_sport;
3289 um->old_sport = x->encap->encap_sport;
3290 um->reqid = x->props.reqid;
3291
3292 nlmsg_end(skb, nlh);
3293 return 0;
3294}
3295
3296static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3297 __be16 sport)
3298{
3299 struct net *net = xs_net(x);
3300 struct sk_buff *skb;
3301 int err;
3302
3303 if (x->id.proto != IPPROTO_ESP)
3304 return -EINVAL;
3305
3306 if (!x->encap)
3307 return -EINVAL;
3308
3309 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3310 if (skb == NULL)
3311 return -ENOMEM;
3312
3313 err = build_mapping(skb, x, ipaddr, sport);
3314 BUG_ON(err < 0);
3315
3316 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3317}
3318
3319static bool xfrm_is_alive(const struct km_event *c)
3320{
3321 return (bool)xfrm_acquire_is_on(c->net);
3322}
3323
3324static struct xfrm_mgr netlink_mgr = {
3325 .notify = xfrm_send_state_notify,
3326 .acquire = xfrm_send_acquire,
3327 .compile_policy = xfrm_compile_policy,
3328 .notify_policy = xfrm_send_policy_notify,
3329 .report = xfrm_send_report,
3330 .migrate = xfrm_send_migrate,
3331 .new_mapping = xfrm_send_mapping,
3332 .is_alive = xfrm_is_alive,
3333};
3334
3335static int __net_init xfrm_user_net_init(struct net *net)
3336{
3337 struct sock *nlsk;
3338 struct netlink_kernel_cfg cfg = {
3339 .groups = XFRMNLGRP_MAX,
3340 .input = xfrm_netlink_rcv,
3341 };
3342
3343 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3344 if (nlsk == NULL)
3345 return -ENOMEM;
3346 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3347 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3348 return 0;
3349}
3350
3351static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3352{
3353 struct net *net;
3354 list_for_each_entry(net, net_exit_list, exit_list)
3355 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3356 synchronize_net();
3357 list_for_each_entry(net, net_exit_list, exit_list)
3358 netlink_kernel_release(net->xfrm.nlsk_stash);
3359}
3360
3361static struct pernet_operations xfrm_user_net_ops = {
3362 .init = xfrm_user_net_init,
3363 .exit_batch = xfrm_user_net_exit,
3364};
3365
3366static int __init xfrm_user_init(void)
3367{
3368 int rv;
3369
3370 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3371
3372 rv = register_pernet_subsys(&xfrm_user_net_ops);
3373 if (rv < 0)
3374 return rv;
3375 rv = xfrm_register_km(&netlink_mgr);
3376 if (rv < 0)
3377 unregister_pernet_subsys(&xfrm_user_net_ops);
3378 return rv;
3379}
3380
3381static void __exit xfrm_user_exit(void)
3382{
3383 xfrm_unregister_km(&netlink_mgr);
3384 unregister_pernet_subsys(&xfrm_user_net_ops);
3385}
3386
3387module_init(xfrm_user_init);
3388module_exit(xfrm_user_exit);
3389MODULE_LICENSE("GPL");
3390MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);