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