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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 <asm/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,
134 struct netlink_ext_ack *extack)
135{
136 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
137 struct xfrm_replay_state_esn *rs;
138
139 if (!rt) {
140 if (p->flags & XFRM_STATE_ESN) {
141 NL_SET_ERR_MSG(extack, "Missing required attribute for ESN");
142 return -EINVAL;
143 }
144 return 0;
145 }
146
147 rs = nla_data(rt);
148
149 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) {
150 NL_SET_ERR_MSG(extack, "ESN bitmap length must be <= 128");
151 return -EINVAL;
152 }
153
154 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
155 nla_len(rt) != sizeof(*rs)) {
156 NL_SET_ERR_MSG(extack, "ESN attribute is too short to fit the full bitmap length");
157 return -EINVAL;
158 }
159
160 /* As only ESP and AH support ESN feature. */
161 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) {
162 NL_SET_ERR_MSG(extack, "ESN only supported for ESP and AH");
163 return -EINVAL;
164 }
165
166 if (p->replay_window != 0) {
167 NL_SET_ERR_MSG(extack, "ESN not compatible with legacy replay_window");
168 return -EINVAL;
169 }
170
171 return 0;
172}
173
174static int verify_newsa_info(struct xfrm_usersa_info *p,
175 struct nlattr **attrs,
176 struct netlink_ext_ack *extack)
177{
178 int err;
179
180 err = -EINVAL;
181 switch (p->family) {
182 case AF_INET:
183 break;
184
185 case AF_INET6:
186#if IS_ENABLED(CONFIG_IPV6)
187 break;
188#else
189 err = -EAFNOSUPPORT;
190 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
191 goto out;
192#endif
193
194 default:
195 NL_SET_ERR_MSG(extack, "Invalid address family");
196 goto out;
197 }
198
199 switch (p->sel.family) {
200 case AF_UNSPEC:
201 break;
202
203 case AF_INET:
204 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
205 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
206 goto out;
207 }
208
209 break;
210
211 case AF_INET6:
212#if IS_ENABLED(CONFIG_IPV6)
213 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
214 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
215 goto out;
216 }
217
218 break;
219#else
220 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
221 err = -EAFNOSUPPORT;
222 goto out;
223#endif
224
225 default:
226 NL_SET_ERR_MSG(extack, "Invalid address family in selector");
227 goto out;
228 }
229
230 err = -EINVAL;
231 switch (p->id.proto) {
232 case IPPROTO_AH:
233 if (!attrs[XFRMA_ALG_AUTH] &&
234 !attrs[XFRMA_ALG_AUTH_TRUNC]) {
235 NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH");
236 goto out;
237 }
238
239 if (attrs[XFRMA_ALG_AEAD] ||
240 attrs[XFRMA_ALG_CRYPT] ||
241 attrs[XFRMA_ALG_COMP] ||
242 attrs[XFRMA_TFCPAD]) {
243 NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD");
244 goto out;
245 }
246 break;
247
248 case IPPROTO_ESP:
249 if (attrs[XFRMA_ALG_COMP]) {
250 NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP");
251 goto out;
252 }
253
254 if (!attrs[XFRMA_ALG_AUTH] &&
255 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
256 !attrs[XFRMA_ALG_CRYPT] &&
257 !attrs[XFRMA_ALG_AEAD]) {
258 NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD");
259 goto out;
260 }
261
262 if ((attrs[XFRMA_ALG_AUTH] ||
263 attrs[XFRMA_ALG_AUTH_TRUNC] ||
264 attrs[XFRMA_ALG_CRYPT]) &&
265 attrs[XFRMA_ALG_AEAD]) {
266 NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT");
267 goto out;
268 }
269
270 if (attrs[XFRMA_TFCPAD] &&
271 p->mode != XFRM_MODE_TUNNEL) {
272 NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode");
273 goto out;
274 }
275 break;
276
277 case IPPROTO_COMP:
278 if (!attrs[XFRMA_ALG_COMP]) {
279 NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP");
280 goto out;
281 }
282
283 if (attrs[XFRMA_ALG_AEAD] ||
284 attrs[XFRMA_ALG_AUTH] ||
285 attrs[XFRMA_ALG_AUTH_TRUNC] ||
286 attrs[XFRMA_ALG_CRYPT] ||
287 attrs[XFRMA_TFCPAD]) {
288 NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD");
289 goto out;
290 }
291
292 if (ntohl(p->id.spi) >= 0x10000) {
293 NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)");
294 goto out;
295 }
296 break;
297
298#if IS_ENABLED(CONFIG_IPV6)
299 case IPPROTO_DSTOPTS:
300 case IPPROTO_ROUTING:
301 if (attrs[XFRMA_ALG_COMP] ||
302 attrs[XFRMA_ALG_AUTH] ||
303 attrs[XFRMA_ALG_AUTH_TRUNC] ||
304 attrs[XFRMA_ALG_AEAD] ||
305 attrs[XFRMA_ALG_CRYPT] ||
306 attrs[XFRMA_ENCAP] ||
307 attrs[XFRMA_SEC_CTX] ||
308 attrs[XFRMA_TFCPAD]) {
309 NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING");
310 goto out;
311 }
312
313 if (!attrs[XFRMA_COADDR]) {
314 NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING");
315 goto out;
316 }
317 break;
318#endif
319
320 default:
321 NL_SET_ERR_MSG(extack, "Unsupported protocol");
322 goto out;
323 }
324
325 if ((err = verify_aead(attrs, extack)))
326 goto out;
327 if ((err = verify_auth_trunc(attrs, extack)))
328 goto out;
329 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack)))
330 goto out;
331 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack)))
332 goto out;
333 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack)))
334 goto out;
335 if ((err = verify_sec_ctx_len(attrs, extack)))
336 goto out;
337 if ((err = verify_replay(p, attrs, extack)))
338 goto out;
339
340 err = -EINVAL;
341 switch (p->mode) {
342 case XFRM_MODE_TRANSPORT:
343 case XFRM_MODE_TUNNEL:
344 case XFRM_MODE_ROUTEOPTIMIZATION:
345 case XFRM_MODE_BEET:
346 break;
347
348 default:
349 NL_SET_ERR_MSG(extack, "Unsupported mode");
350 goto out;
351 }
352
353 err = 0;
354
355 if (attrs[XFRMA_MTIMER_THRESH]) {
356 if (!attrs[XFRMA_ENCAP]) {
357 NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states");
358 err = -EINVAL;
359 goto out;
360 }
361 }
362
363out:
364 return err;
365}
366
367static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
368 struct xfrm_algo_desc *(*get_byname)(const char *, int),
369 struct nlattr *rta, struct netlink_ext_ack *extack)
370{
371 struct xfrm_algo *p, *ualg;
372 struct xfrm_algo_desc *algo;
373
374 if (!rta)
375 return 0;
376
377 ualg = nla_data(rta);
378
379 algo = get_byname(ualg->alg_name, 1);
380 if (!algo) {
381 NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found");
382 return -ENOSYS;
383 }
384 *props = algo->desc.sadb_alg_id;
385
386 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
387 if (!p)
388 return -ENOMEM;
389
390 strcpy(p->alg_name, algo->name);
391 *algpp = p;
392 return 0;
393}
394
395static int attach_crypt(struct xfrm_state *x, struct nlattr *rta,
396 struct netlink_ext_ack *extack)
397{
398 struct xfrm_algo *p, *ualg;
399 struct xfrm_algo_desc *algo;
400
401 if (!rta)
402 return 0;
403
404 ualg = nla_data(rta);
405
406 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
407 if (!algo) {
408 NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found");
409 return -ENOSYS;
410 }
411 x->props.ealgo = algo->desc.sadb_alg_id;
412
413 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
414 if (!p)
415 return -ENOMEM;
416
417 strcpy(p->alg_name, algo->name);
418 x->ealg = p;
419 x->geniv = algo->uinfo.encr.geniv;
420 return 0;
421}
422
423static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
424 struct nlattr *rta, struct netlink_ext_ack *extack)
425{
426 struct xfrm_algo *ualg;
427 struct xfrm_algo_auth *p;
428 struct xfrm_algo_desc *algo;
429
430 if (!rta)
431 return 0;
432
433 ualg = nla_data(rta);
434
435 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
436 if (!algo) {
437 NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found");
438 return -ENOSYS;
439 }
440 *props = algo->desc.sadb_alg_id;
441
442 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
443 if (!p)
444 return -ENOMEM;
445
446 strcpy(p->alg_name, algo->name);
447 p->alg_key_len = ualg->alg_key_len;
448 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
449 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
450
451 *algpp = p;
452 return 0;
453}
454
455static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
456 struct nlattr *rta, struct netlink_ext_ack *extack)
457{
458 struct xfrm_algo_auth *p, *ualg;
459 struct xfrm_algo_desc *algo;
460
461 if (!rta)
462 return 0;
463
464 ualg = nla_data(rta);
465
466 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
467 if (!algo) {
468 NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found");
469 return -ENOSYS;
470 }
471 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) {
472 NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV");
473 return -EINVAL;
474 }
475 *props = algo->desc.sadb_alg_id;
476
477 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
478 if (!p)
479 return -ENOMEM;
480
481 strcpy(p->alg_name, algo->name);
482 if (!p->alg_trunc_len)
483 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
484
485 *algpp = p;
486 return 0;
487}
488
489static int attach_aead(struct xfrm_state *x, struct nlattr *rta,
490 struct netlink_ext_ack *extack)
491{
492 struct xfrm_algo_aead *p, *ualg;
493 struct xfrm_algo_desc *algo;
494
495 if (!rta)
496 return 0;
497
498 ualg = nla_data(rta);
499
500 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
501 if (!algo) {
502 NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found");
503 return -ENOSYS;
504 }
505 x->props.ealgo = algo->desc.sadb_alg_id;
506
507 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
508 if (!p)
509 return -ENOMEM;
510
511 strcpy(p->alg_name, algo->name);
512 x->aead = p;
513 x->geniv = algo->uinfo.aead.geniv;
514 return 0;
515}
516
517static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
518 struct nlattr *rp,
519 struct netlink_ext_ack *extack)
520{
521 struct xfrm_replay_state_esn *up;
522 unsigned int ulen;
523
524 if (!replay_esn || !rp)
525 return 0;
526
527 up = nla_data(rp);
528 ulen = xfrm_replay_state_esn_len(up);
529
530 /* Check the overall length and the internal bitmap length to avoid
531 * potential overflow. */
532 if (nla_len(rp) < (int)ulen) {
533 NL_SET_ERR_MSG(extack, "ESN attribute is too short");
534 return -EINVAL;
535 }
536
537 if (xfrm_replay_state_esn_len(replay_esn) != ulen) {
538 NL_SET_ERR_MSG(extack, "New ESN size doesn't match the existing SA's ESN size");
539 return -EINVAL;
540 }
541
542 if (replay_esn->bmp_len != up->bmp_len) {
543 NL_SET_ERR_MSG(extack, "New ESN bitmap size doesn't match the existing SA's ESN bitmap");
544 return -EINVAL;
545 }
546
547 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) {
548 NL_SET_ERR_MSG(extack, "ESN replay window is longer than the bitmap");
549 return -EINVAL;
550 }
551
552 return 0;
553}
554
555static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
556 struct xfrm_replay_state_esn **preplay_esn,
557 struct nlattr *rta)
558{
559 struct xfrm_replay_state_esn *p, *pp, *up;
560 unsigned int klen, ulen;
561
562 if (!rta)
563 return 0;
564
565 up = nla_data(rta);
566 klen = xfrm_replay_state_esn_len(up);
567 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
568
569 p = kzalloc(klen, GFP_KERNEL);
570 if (!p)
571 return -ENOMEM;
572
573 pp = kzalloc(klen, GFP_KERNEL);
574 if (!pp) {
575 kfree(p);
576 return -ENOMEM;
577 }
578
579 memcpy(p, up, ulen);
580 memcpy(pp, up, ulen);
581
582 *replay_esn = p;
583 *preplay_esn = pp;
584
585 return 0;
586}
587
588static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
589{
590 unsigned int len = 0;
591
592 if (xfrm_ctx) {
593 len += sizeof(struct xfrm_user_sec_ctx);
594 len += xfrm_ctx->ctx_len;
595 }
596 return len;
597}
598
599static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
600{
601 memcpy(&x->id, &p->id, sizeof(x->id));
602 memcpy(&x->sel, &p->sel, sizeof(x->sel));
603 memcpy(&x->lft, &p->lft, sizeof(x->lft));
604 x->props.mode = p->mode;
605 x->props.replay_window = min_t(unsigned int, p->replay_window,
606 sizeof(x->replay.bitmap) * 8);
607 x->props.reqid = p->reqid;
608 x->props.family = p->family;
609 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
610 x->props.flags = p->flags;
611
612 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
613 x->sel.family = p->family;
614}
615
616/*
617 * someday when pfkey also has support, we could have the code
618 * somehow made shareable and move it to xfrm_state.c - JHS
619 *
620*/
621static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
622 int update_esn)
623{
624 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
625 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
626 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
627 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
628 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
629 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
630
631 if (re && x->replay_esn && x->preplay_esn) {
632 struct xfrm_replay_state_esn *replay_esn;
633 replay_esn = nla_data(re);
634 memcpy(x->replay_esn, replay_esn,
635 xfrm_replay_state_esn_len(replay_esn));
636 memcpy(x->preplay_esn, replay_esn,
637 xfrm_replay_state_esn_len(replay_esn));
638 }
639
640 if (rp) {
641 struct xfrm_replay_state *replay;
642 replay = nla_data(rp);
643 memcpy(&x->replay, replay, sizeof(*replay));
644 memcpy(&x->preplay, replay, sizeof(*replay));
645 }
646
647 if (lt) {
648 struct xfrm_lifetime_cur *ltime;
649 ltime = nla_data(lt);
650 x->curlft.bytes = ltime->bytes;
651 x->curlft.packets = ltime->packets;
652 x->curlft.add_time = ltime->add_time;
653 x->curlft.use_time = ltime->use_time;
654 }
655
656 if (et)
657 x->replay_maxage = nla_get_u32(et);
658
659 if (rt)
660 x->replay_maxdiff = nla_get_u32(rt);
661
662 if (mt)
663 x->mapping_maxage = nla_get_u32(mt);
664}
665
666static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
667{
668 if (attrs[XFRMA_SET_MARK]) {
669 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
670 if (attrs[XFRMA_SET_MARK_MASK])
671 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
672 else
673 m->m = 0xffffffff;
674 } else {
675 m->v = m->m = 0;
676 }
677}
678
679static struct xfrm_state *xfrm_state_construct(struct net *net,
680 struct xfrm_usersa_info *p,
681 struct nlattr **attrs,
682 int *errp,
683 struct netlink_ext_ack *extack)
684{
685 struct xfrm_state *x = xfrm_state_alloc(net);
686 int err = -ENOMEM;
687
688 if (!x)
689 goto error_no_put;
690
691 copy_from_user_state(x, p);
692
693 if (attrs[XFRMA_ENCAP]) {
694 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
695 sizeof(*x->encap), GFP_KERNEL);
696 if (x->encap == NULL)
697 goto error;
698 }
699
700 if (attrs[XFRMA_COADDR]) {
701 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
702 sizeof(*x->coaddr), GFP_KERNEL);
703 if (x->coaddr == NULL)
704 goto error;
705 }
706
707 if (attrs[XFRMA_SA_EXTRA_FLAGS])
708 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
709
710 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack)))
711 goto error;
712 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
713 attrs[XFRMA_ALG_AUTH_TRUNC], extack)))
714 goto error;
715 if (!x->props.aalgo) {
716 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
717 attrs[XFRMA_ALG_AUTH], extack)))
718 goto error;
719 }
720 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack)))
721 goto error;
722 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
723 xfrm_calg_get_byname,
724 attrs[XFRMA_ALG_COMP], extack)))
725 goto error;
726
727 if (attrs[XFRMA_TFCPAD])
728 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
729
730 xfrm_mark_get(attrs, &x->mark);
731
732 xfrm_smark_init(attrs, &x->props.smark);
733
734 if (attrs[XFRMA_IF_ID])
735 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
736
737 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack);
738 if (err)
739 goto error;
740
741 if (attrs[XFRMA_SEC_CTX]) {
742 err = security_xfrm_state_alloc(x,
743 nla_data(attrs[XFRMA_SEC_CTX]));
744 if (err)
745 goto error;
746 }
747
748 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
749 attrs[XFRMA_REPLAY_ESN_VAL])))
750 goto error;
751
752 x->km.seq = p->seq;
753 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
754 /* sysctl_xfrm_aevent_etime is in 100ms units */
755 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
756
757 if ((err = xfrm_init_replay(x, extack)))
758 goto error;
759
760 /* override default values from above */
761 xfrm_update_ae_params(x, attrs, 0);
762
763 /* configure the hardware if offload is requested */
764 if (attrs[XFRMA_OFFLOAD_DEV]) {
765 err = xfrm_dev_state_add(net, x,
766 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
767 extack);
768 if (err)
769 goto error;
770 }
771
772 return x;
773
774error:
775 x->km.state = XFRM_STATE_DEAD;
776 xfrm_state_put(x);
777error_no_put:
778 *errp = err;
779 return NULL;
780}
781
782static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
783 struct nlattr **attrs, struct netlink_ext_ack *extack)
784{
785 struct net *net = sock_net(skb->sk);
786 struct xfrm_usersa_info *p = nlmsg_data(nlh);
787 struct xfrm_state *x;
788 int err;
789 struct km_event c;
790
791 err = verify_newsa_info(p, attrs, extack);
792 if (err)
793 return err;
794
795 x = xfrm_state_construct(net, p, attrs, &err, extack);
796 if (!x)
797 return err;
798
799 xfrm_state_hold(x);
800 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
801 err = xfrm_state_add(x);
802 else
803 err = xfrm_state_update(x);
804
805 xfrm_audit_state_add(x, err ? 0 : 1, true);
806
807 if (err < 0) {
808 x->km.state = XFRM_STATE_DEAD;
809 xfrm_dev_state_delete(x);
810 __xfrm_state_put(x);
811 goto out;
812 }
813
814 if (x->km.state == XFRM_STATE_VOID)
815 x->km.state = XFRM_STATE_VALID;
816
817 c.seq = nlh->nlmsg_seq;
818 c.portid = nlh->nlmsg_pid;
819 c.event = nlh->nlmsg_type;
820
821 km_state_notify(x, &c);
822out:
823 xfrm_state_put(x);
824 return err;
825}
826
827static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
828 struct xfrm_usersa_id *p,
829 struct nlattr **attrs,
830 int *errp)
831{
832 struct xfrm_state *x = NULL;
833 struct xfrm_mark m;
834 int err;
835 u32 mark = xfrm_mark_get(attrs, &m);
836
837 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
838 err = -ESRCH;
839 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
840 } else {
841 xfrm_address_t *saddr = NULL;
842
843 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
844 if (!saddr) {
845 err = -EINVAL;
846 goto out;
847 }
848
849 err = -ESRCH;
850 x = xfrm_state_lookup_byaddr(net, mark,
851 &p->daddr, saddr,
852 p->proto, p->family);
853 }
854
855 out:
856 if (!x && errp)
857 *errp = err;
858 return x;
859}
860
861static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
862 struct nlattr **attrs, struct netlink_ext_ack *extack)
863{
864 struct net *net = sock_net(skb->sk);
865 struct xfrm_state *x;
866 int err = -ESRCH;
867 struct km_event c;
868 struct xfrm_usersa_id *p = nlmsg_data(nlh);
869
870 x = xfrm_user_state_lookup(net, p, attrs, &err);
871 if (x == NULL)
872 return err;
873
874 if ((err = security_xfrm_state_delete(x)) != 0)
875 goto out;
876
877 if (xfrm_state_kern(x)) {
878 NL_SET_ERR_MSG(extack, "SA is in use by tunnels");
879 err = -EPERM;
880 goto out;
881 }
882
883 err = xfrm_state_delete(x);
884 if (err < 0)
885 goto out;
886
887 c.seq = nlh->nlmsg_seq;
888 c.portid = nlh->nlmsg_pid;
889 c.event = nlh->nlmsg_type;
890 km_state_notify(x, &c);
891
892out:
893 xfrm_audit_state_delete(x, err ? 0 : 1, true);
894 xfrm_state_put(x);
895 return err;
896}
897
898static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
899{
900 memset(p, 0, sizeof(*p));
901 memcpy(&p->id, &x->id, sizeof(p->id));
902 memcpy(&p->sel, &x->sel, sizeof(p->sel));
903 memcpy(&p->lft, &x->lft, sizeof(p->lft));
904 if (x->xso.dev)
905 xfrm_dev_state_update_curlft(x);
906 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
907 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
908 put_unaligned(x->stats.replay, &p->stats.replay);
909 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
910 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
911 p->mode = x->props.mode;
912 p->replay_window = x->props.replay_window;
913 p->reqid = x->props.reqid;
914 p->family = x->props.family;
915 p->flags = x->props.flags;
916 p->seq = x->km.seq;
917}
918
919struct xfrm_dump_info {
920 struct sk_buff *in_skb;
921 struct sk_buff *out_skb;
922 u32 nlmsg_seq;
923 u16 nlmsg_flags;
924};
925
926static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
927{
928 struct xfrm_user_sec_ctx *uctx;
929 struct nlattr *attr;
930 int ctx_size = sizeof(*uctx) + s->ctx_len;
931
932 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
933 if (attr == NULL)
934 return -EMSGSIZE;
935
936 uctx = nla_data(attr);
937 uctx->exttype = XFRMA_SEC_CTX;
938 uctx->len = ctx_size;
939 uctx->ctx_doi = s->ctx_doi;
940 uctx->ctx_alg = s->ctx_alg;
941 uctx->ctx_len = s->ctx_len;
942 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
943
944 return 0;
945}
946
947static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb)
948{
949 struct xfrm_user_offload *xuo;
950 struct nlattr *attr;
951
952 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
953 if (attr == NULL)
954 return -EMSGSIZE;
955
956 xuo = nla_data(attr);
957 memset(xuo, 0, sizeof(*xuo));
958 xuo->ifindex = xso->dev->ifindex;
959 if (xso->dir == XFRM_DEV_OFFLOAD_IN)
960 xuo->flags = XFRM_OFFLOAD_INBOUND;
961 if (xso->type == XFRM_DEV_OFFLOAD_PACKET)
962 xuo->flags |= XFRM_OFFLOAD_PACKET;
963
964 return 0;
965}
966
967static bool xfrm_redact(void)
968{
969 return IS_ENABLED(CONFIG_SECURITY) &&
970 security_locked_down(LOCKDOWN_XFRM_SECRET);
971}
972
973static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
974{
975 struct xfrm_algo *algo;
976 struct xfrm_algo_auth *ap;
977 struct nlattr *nla;
978 bool redact_secret = xfrm_redact();
979
980 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
981 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
982 if (!nla)
983 return -EMSGSIZE;
984 algo = nla_data(nla);
985 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
986
987 if (redact_secret && auth->alg_key_len)
988 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
989 else
990 memcpy(algo->alg_key, auth->alg_key,
991 (auth->alg_key_len + 7) / 8);
992 algo->alg_key_len = auth->alg_key_len;
993
994 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
995 if (!nla)
996 return -EMSGSIZE;
997 ap = nla_data(nla);
998 memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
999 if (redact_secret && auth->alg_key_len)
1000 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
1001 else
1002 memcpy(ap->alg_key, auth->alg_key,
1003 (auth->alg_key_len + 7) / 8);
1004 return 0;
1005}
1006
1007static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
1008{
1009 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
1010 struct xfrm_algo_aead *ap;
1011 bool redact_secret = xfrm_redact();
1012
1013 if (!nla)
1014 return -EMSGSIZE;
1015
1016 ap = nla_data(nla);
1017 strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name));
1018 ap->alg_key_len = aead->alg_key_len;
1019 ap->alg_icv_len = aead->alg_icv_len;
1020
1021 if (redact_secret && aead->alg_key_len)
1022 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
1023 else
1024 memcpy(ap->alg_key, aead->alg_key,
1025 (aead->alg_key_len + 7) / 8);
1026 return 0;
1027}
1028
1029static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
1030{
1031 struct xfrm_algo *ap;
1032 bool redact_secret = xfrm_redact();
1033 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
1034 xfrm_alg_len(ealg));
1035 if (!nla)
1036 return -EMSGSIZE;
1037
1038 ap = nla_data(nla);
1039 strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name));
1040 ap->alg_key_len = ealg->alg_key_len;
1041
1042 if (redact_secret && ealg->alg_key_len)
1043 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
1044 else
1045 memcpy(ap->alg_key, ealg->alg_key,
1046 (ealg->alg_key_len + 7) / 8);
1047
1048 return 0;
1049}
1050
1051static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb)
1052{
1053 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg));
1054 struct xfrm_algo *ap;
1055
1056 if (!nla)
1057 return -EMSGSIZE;
1058
1059 ap = nla_data(nla);
1060 strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name));
1061 ap->alg_key_len = 0;
1062
1063 return 0;
1064}
1065
1066static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb)
1067{
1068 struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep));
1069 struct xfrm_encap_tmpl *uep;
1070
1071 if (!nla)
1072 return -EMSGSIZE;
1073
1074 uep = nla_data(nla);
1075 memset(uep, 0, sizeof(*uep));
1076
1077 uep->encap_type = ep->encap_type;
1078 uep->encap_sport = ep->encap_sport;
1079 uep->encap_dport = ep->encap_dport;
1080 uep->encap_oa = ep->encap_oa;
1081
1082 return 0;
1083}
1084
1085static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
1086{
1087 int ret = 0;
1088
1089 if (m->v | m->m) {
1090 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
1091 if (!ret)
1092 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
1093 }
1094 return ret;
1095}
1096
1097/* Don't change this without updating xfrm_sa_len! */
1098static int copy_to_user_state_extra(struct xfrm_state *x,
1099 struct xfrm_usersa_info *p,
1100 struct sk_buff *skb)
1101{
1102 int ret = 0;
1103
1104 copy_to_user_state(x, p);
1105
1106 if (x->props.extra_flags) {
1107 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
1108 x->props.extra_flags);
1109 if (ret)
1110 goto out;
1111 }
1112
1113 if (x->coaddr) {
1114 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
1115 if (ret)
1116 goto out;
1117 }
1118 if (x->lastused) {
1119 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
1120 XFRMA_PAD);
1121 if (ret)
1122 goto out;
1123 }
1124 if (x->aead) {
1125 ret = copy_to_user_aead(x->aead, skb);
1126 if (ret)
1127 goto out;
1128 }
1129 if (x->aalg) {
1130 ret = copy_to_user_auth(x->aalg, skb);
1131 if (ret)
1132 goto out;
1133 }
1134 if (x->ealg) {
1135 ret = copy_to_user_ealg(x->ealg, skb);
1136 if (ret)
1137 goto out;
1138 }
1139 if (x->calg) {
1140 ret = copy_to_user_calg(x->calg, skb);
1141 if (ret)
1142 goto out;
1143 }
1144 if (x->encap) {
1145 ret = copy_to_user_encap(x->encap, skb);
1146 if (ret)
1147 goto out;
1148 }
1149 if (x->tfcpad) {
1150 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
1151 if (ret)
1152 goto out;
1153 }
1154 ret = xfrm_mark_put(skb, &x->mark);
1155 if (ret)
1156 goto out;
1157
1158 ret = xfrm_smark_put(skb, &x->props.smark);
1159 if (ret)
1160 goto out;
1161
1162 if (x->replay_esn)
1163 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1164 xfrm_replay_state_esn_len(x->replay_esn),
1165 x->replay_esn);
1166 else
1167 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1168 &x->replay);
1169 if (ret)
1170 goto out;
1171 if(x->xso.dev)
1172 ret = copy_user_offload(&x->xso, skb);
1173 if (ret)
1174 goto out;
1175 if (x->if_id) {
1176 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1177 if (ret)
1178 goto out;
1179 }
1180 if (x->security) {
1181 ret = copy_sec_ctx(x->security, skb);
1182 if (ret)
1183 goto out;
1184 }
1185 if (x->mapping_maxage)
1186 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
1187out:
1188 return ret;
1189}
1190
1191static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1192{
1193 struct xfrm_dump_info *sp = ptr;
1194 struct sk_buff *in_skb = sp->in_skb;
1195 struct sk_buff *skb = sp->out_skb;
1196 struct xfrm_translator *xtr;
1197 struct xfrm_usersa_info *p;
1198 struct nlmsghdr *nlh;
1199 int err;
1200
1201 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1202 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1203 if (nlh == NULL)
1204 return -EMSGSIZE;
1205
1206 p = nlmsg_data(nlh);
1207
1208 err = copy_to_user_state_extra(x, p, skb);
1209 if (err) {
1210 nlmsg_cancel(skb, nlh);
1211 return err;
1212 }
1213 nlmsg_end(skb, nlh);
1214
1215 xtr = xfrm_get_translator();
1216 if (xtr) {
1217 err = xtr->alloc_compat(skb, nlh);
1218
1219 xfrm_put_translator(xtr);
1220 if (err) {
1221 nlmsg_cancel(skb, nlh);
1222 return err;
1223 }
1224 }
1225
1226 return 0;
1227}
1228
1229static int xfrm_dump_sa_done(struct netlink_callback *cb)
1230{
1231 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1232 struct sock *sk = cb->skb->sk;
1233 struct net *net = sock_net(sk);
1234
1235 if (cb->args[0])
1236 xfrm_state_walk_done(walk, net);
1237 return 0;
1238}
1239
1240static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1241{
1242 struct net *net = sock_net(skb->sk);
1243 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1244 struct xfrm_dump_info info;
1245
1246 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1247 sizeof(cb->args) - sizeof(cb->args[0]));
1248
1249 info.in_skb = cb->skb;
1250 info.out_skb = skb;
1251 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1252 info.nlmsg_flags = NLM_F_MULTI;
1253
1254 if (!cb->args[0]) {
1255 struct nlattr *attrs[XFRMA_MAX+1];
1256 struct xfrm_address_filter *filter = NULL;
1257 u8 proto = 0;
1258 int err;
1259
1260 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1261 xfrma_policy, cb->extack);
1262 if (err < 0)
1263 return err;
1264
1265 if (attrs[XFRMA_ADDRESS_FILTER]) {
1266 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1267 sizeof(*filter), GFP_KERNEL);
1268 if (filter == NULL)
1269 return -ENOMEM;
1270
1271 /* see addr_match(), (prefix length >> 5) << 2
1272 * will be used to compare xfrm_address_t
1273 */
1274 if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1275 filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1276 kfree(filter);
1277 return -EINVAL;
1278 }
1279 }
1280
1281 if (attrs[XFRMA_PROTO])
1282 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1283
1284 xfrm_state_walk_init(walk, proto, filter);
1285 cb->args[0] = 1;
1286 }
1287
1288 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1289
1290 return skb->len;
1291}
1292
1293static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1294 struct xfrm_state *x, u32 seq)
1295{
1296 struct xfrm_dump_info info;
1297 struct sk_buff *skb;
1298 int err;
1299
1300 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1301 if (!skb)
1302 return ERR_PTR(-ENOMEM);
1303
1304 info.in_skb = in_skb;
1305 info.out_skb = skb;
1306 info.nlmsg_seq = seq;
1307 info.nlmsg_flags = 0;
1308
1309 err = dump_one_state(x, 0, &info);
1310 if (err) {
1311 kfree_skb(skb);
1312 return ERR_PTR(err);
1313 }
1314
1315 return skb;
1316}
1317
1318/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1319 * Must be called with RCU read lock.
1320 */
1321static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1322 u32 pid, unsigned int group)
1323{
1324 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1325 struct xfrm_translator *xtr;
1326
1327 if (!nlsk) {
1328 kfree_skb(skb);
1329 return -EPIPE;
1330 }
1331
1332 xtr = xfrm_get_translator();
1333 if (xtr) {
1334 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1335
1336 xfrm_put_translator(xtr);
1337 if (err) {
1338 kfree_skb(skb);
1339 return err;
1340 }
1341 }
1342
1343 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1344}
1345
1346static inline unsigned int xfrm_spdinfo_msgsize(void)
1347{
1348 return NLMSG_ALIGN(4)
1349 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1350 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1351 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1352 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1353}
1354
1355static int build_spdinfo(struct sk_buff *skb, struct net *net,
1356 u32 portid, u32 seq, u32 flags)
1357{
1358 struct xfrmk_spdinfo si;
1359 struct xfrmu_spdinfo spc;
1360 struct xfrmu_spdhinfo sph;
1361 struct xfrmu_spdhthresh spt4, spt6;
1362 struct nlmsghdr *nlh;
1363 int err;
1364 u32 *f;
1365 unsigned lseq;
1366
1367 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1368 if (nlh == NULL) /* shouldn't really happen ... */
1369 return -EMSGSIZE;
1370
1371 f = nlmsg_data(nlh);
1372 *f = flags;
1373 xfrm_spd_getinfo(net, &si);
1374 spc.incnt = si.incnt;
1375 spc.outcnt = si.outcnt;
1376 spc.fwdcnt = si.fwdcnt;
1377 spc.inscnt = si.inscnt;
1378 spc.outscnt = si.outscnt;
1379 spc.fwdscnt = si.fwdscnt;
1380 sph.spdhcnt = si.spdhcnt;
1381 sph.spdhmcnt = si.spdhmcnt;
1382
1383 do {
1384 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1385
1386 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1387 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1388 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1389 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1390 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1391
1392 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1393 if (!err)
1394 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1395 if (!err)
1396 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1397 if (!err)
1398 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1399 if (err) {
1400 nlmsg_cancel(skb, nlh);
1401 return err;
1402 }
1403
1404 nlmsg_end(skb, nlh);
1405 return 0;
1406}
1407
1408static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1409 struct nlattr **attrs,
1410 struct netlink_ext_ack *extack)
1411{
1412 struct net *net = sock_net(skb->sk);
1413 struct xfrmu_spdhthresh *thresh4 = NULL;
1414 struct xfrmu_spdhthresh *thresh6 = NULL;
1415
1416 /* selector prefixlen thresholds to hash policies */
1417 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1418 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1419
1420 if (nla_len(rta) < sizeof(*thresh4)) {
1421 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV4_HTHRESH attribute length");
1422 return -EINVAL;
1423 }
1424 thresh4 = nla_data(rta);
1425 if (thresh4->lbits > 32 || thresh4->rbits > 32) {
1426 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 32 for IPv4)");
1427 return -EINVAL;
1428 }
1429 }
1430 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1431 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1432
1433 if (nla_len(rta) < sizeof(*thresh6)) {
1434 NL_SET_ERR_MSG(extack, "Invalid SPD_IPV6_HTHRESH attribute length");
1435 return -EINVAL;
1436 }
1437 thresh6 = nla_data(rta);
1438 if (thresh6->lbits > 128 || thresh6->rbits > 128) {
1439 NL_SET_ERR_MSG(extack, "Invalid hash threshold (must be <= 128 for IPv6)");
1440 return -EINVAL;
1441 }
1442 }
1443
1444 if (thresh4 || thresh6) {
1445 write_seqlock(&net->xfrm.policy_hthresh.lock);
1446 if (thresh4) {
1447 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1448 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1449 }
1450 if (thresh6) {
1451 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1452 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1453 }
1454 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1455
1456 xfrm_policy_hash_rebuild(net);
1457 }
1458
1459 return 0;
1460}
1461
1462static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1463 struct nlattr **attrs,
1464 struct netlink_ext_ack *extack)
1465{
1466 struct net *net = sock_net(skb->sk);
1467 struct sk_buff *r_skb;
1468 u32 *flags = nlmsg_data(nlh);
1469 u32 sportid = NETLINK_CB(skb).portid;
1470 u32 seq = nlh->nlmsg_seq;
1471 int err;
1472
1473 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1474 if (r_skb == NULL)
1475 return -ENOMEM;
1476
1477 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1478 BUG_ON(err < 0);
1479
1480 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1481}
1482
1483static inline unsigned int xfrm_sadinfo_msgsize(void)
1484{
1485 return NLMSG_ALIGN(4)
1486 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1487 + nla_total_size(4); /* XFRMA_SAD_CNT */
1488}
1489
1490static int build_sadinfo(struct sk_buff *skb, struct net *net,
1491 u32 portid, u32 seq, u32 flags)
1492{
1493 struct xfrmk_sadinfo si;
1494 struct xfrmu_sadhinfo sh;
1495 struct nlmsghdr *nlh;
1496 int err;
1497 u32 *f;
1498
1499 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1500 if (nlh == NULL) /* shouldn't really happen ... */
1501 return -EMSGSIZE;
1502
1503 f = nlmsg_data(nlh);
1504 *f = flags;
1505 xfrm_sad_getinfo(net, &si);
1506
1507 sh.sadhmcnt = si.sadhmcnt;
1508 sh.sadhcnt = si.sadhcnt;
1509
1510 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1511 if (!err)
1512 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1513 if (err) {
1514 nlmsg_cancel(skb, nlh);
1515 return err;
1516 }
1517
1518 nlmsg_end(skb, nlh);
1519 return 0;
1520}
1521
1522static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1523 struct nlattr **attrs,
1524 struct netlink_ext_ack *extack)
1525{
1526 struct net *net = sock_net(skb->sk);
1527 struct sk_buff *r_skb;
1528 u32 *flags = nlmsg_data(nlh);
1529 u32 sportid = NETLINK_CB(skb).portid;
1530 u32 seq = nlh->nlmsg_seq;
1531 int err;
1532
1533 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1534 if (r_skb == NULL)
1535 return -ENOMEM;
1536
1537 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1538 BUG_ON(err < 0);
1539
1540 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1541}
1542
1543static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1544 struct nlattr **attrs, struct netlink_ext_ack *extack)
1545{
1546 struct net *net = sock_net(skb->sk);
1547 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1548 struct xfrm_state *x;
1549 struct sk_buff *resp_skb;
1550 int err = -ESRCH;
1551
1552 x = xfrm_user_state_lookup(net, p, attrs, &err);
1553 if (x == NULL)
1554 goto out_noput;
1555
1556 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1557 if (IS_ERR(resp_skb)) {
1558 err = PTR_ERR(resp_skb);
1559 } else {
1560 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1561 }
1562 xfrm_state_put(x);
1563out_noput:
1564 return err;
1565}
1566
1567static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1568 struct nlattr **attrs,
1569 struct netlink_ext_ack *extack)
1570{
1571 struct net *net = sock_net(skb->sk);
1572 struct xfrm_state *x;
1573 struct xfrm_userspi_info *p;
1574 struct xfrm_translator *xtr;
1575 struct sk_buff *resp_skb;
1576 xfrm_address_t *daddr;
1577 int family;
1578 int err;
1579 u32 mark;
1580 struct xfrm_mark m;
1581 u32 if_id = 0;
1582
1583 p = nlmsg_data(nlh);
1584 err = verify_spi_info(p->info.id.proto, p->min, p->max, extack);
1585 if (err)
1586 goto out_noput;
1587
1588 family = p->info.family;
1589 daddr = &p->info.id.daddr;
1590
1591 x = NULL;
1592
1593 mark = xfrm_mark_get(attrs, &m);
1594
1595 if (attrs[XFRMA_IF_ID])
1596 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1597
1598 if (p->info.seq) {
1599 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1600 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1601 xfrm_state_put(x);
1602 x = NULL;
1603 }
1604 }
1605
1606 if (!x)
1607 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1608 if_id, p->info.id.proto, daddr,
1609 &p->info.saddr, 1,
1610 family);
1611 err = -ENOENT;
1612 if (!x) {
1613 NL_SET_ERR_MSG(extack, "Target ACQUIRE not found");
1614 goto out_noput;
1615 }
1616
1617 err = xfrm_alloc_spi(x, p->min, p->max, extack);
1618 if (err)
1619 goto out;
1620
1621 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1622 if (IS_ERR(resp_skb)) {
1623 err = PTR_ERR(resp_skb);
1624 goto out;
1625 }
1626
1627 xtr = xfrm_get_translator();
1628 if (xtr) {
1629 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1630
1631 xfrm_put_translator(xtr);
1632 if (err) {
1633 kfree_skb(resp_skb);
1634 goto out;
1635 }
1636 }
1637
1638 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1639
1640out:
1641 xfrm_state_put(x);
1642out_noput:
1643 return err;
1644}
1645
1646static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack)
1647{
1648 switch (dir) {
1649 case XFRM_POLICY_IN:
1650 case XFRM_POLICY_OUT:
1651 case XFRM_POLICY_FWD:
1652 break;
1653
1654 default:
1655 NL_SET_ERR_MSG(extack, "Invalid policy direction");
1656 return -EINVAL;
1657 }
1658
1659 return 0;
1660}
1661
1662static int verify_policy_type(u8 type, struct netlink_ext_ack *extack)
1663{
1664 switch (type) {
1665 case XFRM_POLICY_TYPE_MAIN:
1666#ifdef CONFIG_XFRM_SUB_POLICY
1667 case XFRM_POLICY_TYPE_SUB:
1668#endif
1669 break;
1670
1671 default:
1672 NL_SET_ERR_MSG(extack, "Invalid policy type");
1673 return -EINVAL;
1674 }
1675
1676 return 0;
1677}
1678
1679static int verify_newpolicy_info(struct xfrm_userpolicy_info *p,
1680 struct netlink_ext_ack *extack)
1681{
1682 int ret;
1683
1684 switch (p->share) {
1685 case XFRM_SHARE_ANY:
1686 case XFRM_SHARE_SESSION:
1687 case XFRM_SHARE_USER:
1688 case XFRM_SHARE_UNIQUE:
1689 break;
1690
1691 default:
1692 NL_SET_ERR_MSG(extack, "Invalid policy share");
1693 return -EINVAL;
1694 }
1695
1696 switch (p->action) {
1697 case XFRM_POLICY_ALLOW:
1698 case XFRM_POLICY_BLOCK:
1699 break;
1700
1701 default:
1702 NL_SET_ERR_MSG(extack, "Invalid policy action");
1703 return -EINVAL;
1704 }
1705
1706 switch (p->sel.family) {
1707 case AF_INET:
1708 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) {
1709 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)");
1710 return -EINVAL;
1711 }
1712
1713 break;
1714
1715 case AF_INET6:
1716#if IS_ENABLED(CONFIG_IPV6)
1717 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) {
1718 NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)");
1719 return -EINVAL;
1720 }
1721
1722 break;
1723#else
1724 NL_SET_ERR_MSG(extack, "IPv6 support disabled");
1725 return -EAFNOSUPPORT;
1726#endif
1727
1728 default:
1729 NL_SET_ERR_MSG(extack, "Invalid selector family");
1730 return -EINVAL;
1731 }
1732
1733 ret = verify_policy_dir(p->dir, extack);
1734 if (ret)
1735 return ret;
1736 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) {
1737 NL_SET_ERR_MSG(extack, "Policy index doesn't match direction");
1738 return -EINVAL;
1739 }
1740
1741 return 0;
1742}
1743
1744static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1745{
1746 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1747 struct xfrm_user_sec_ctx *uctx;
1748
1749 if (!rt)
1750 return 0;
1751
1752 uctx = nla_data(rt);
1753 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1754}
1755
1756static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1757 int nr)
1758{
1759 int i;
1760
1761 xp->xfrm_nr = nr;
1762 for (i = 0; i < nr; i++, ut++) {
1763 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1764
1765 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1766 memcpy(&t->saddr, &ut->saddr,
1767 sizeof(xfrm_address_t));
1768 t->reqid = ut->reqid;
1769 t->mode = ut->mode;
1770 t->share = ut->share;
1771 t->optional = ut->optional;
1772 t->aalgos = ut->aalgos;
1773 t->ealgos = ut->ealgos;
1774 t->calgos = ut->calgos;
1775 /* If all masks are ~0, then we allow all algorithms. */
1776 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1777 t->encap_family = ut->family;
1778 }
1779}
1780
1781static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family,
1782 int dir, struct netlink_ext_ack *extack)
1783{
1784 u16 prev_family;
1785 int i;
1786
1787 if (nr > XFRM_MAX_DEPTH) {
1788 NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")");
1789 return -EINVAL;
1790 }
1791
1792 prev_family = family;
1793
1794 for (i = 0; i < nr; i++) {
1795 /* We never validated the ut->family value, so many
1796 * applications simply leave it at zero. The check was
1797 * never made and ut->family was ignored because all
1798 * templates could be assumed to have the same family as
1799 * the policy itself. Now that we will have ipv4-in-ipv6
1800 * and ipv6-in-ipv4 tunnels, this is no longer true.
1801 */
1802 if (!ut[i].family)
1803 ut[i].family = family;
1804
1805 switch (ut[i].mode) {
1806 case XFRM_MODE_TUNNEL:
1807 case XFRM_MODE_BEET:
1808 if (ut[i].optional && dir == XFRM_POLICY_OUT) {
1809 NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy");
1810 return -EINVAL;
1811 }
1812 break;
1813 default:
1814 if (ut[i].family != prev_family) {
1815 NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change");
1816 return -EINVAL;
1817 }
1818 break;
1819 }
1820 if (ut[i].mode >= XFRM_MODE_MAX) {
1821 NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")");
1822 return -EINVAL;
1823 }
1824
1825 prev_family = ut[i].family;
1826
1827 switch (ut[i].family) {
1828 case AF_INET:
1829 break;
1830#if IS_ENABLED(CONFIG_IPV6)
1831 case AF_INET6:
1832 break;
1833#endif
1834 default:
1835 NL_SET_ERR_MSG(extack, "Invalid family in template");
1836 return -EINVAL;
1837 }
1838
1839 if (!xfrm_id_proto_valid(ut[i].id.proto)) {
1840 NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template");
1841 return -EINVAL;
1842 }
1843 }
1844
1845 return 0;
1846}
1847
1848static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs,
1849 int dir, struct netlink_ext_ack *extack)
1850{
1851 struct nlattr *rt = attrs[XFRMA_TMPL];
1852
1853 if (!rt) {
1854 pol->xfrm_nr = 0;
1855 } else {
1856 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1857 int nr = nla_len(rt) / sizeof(*utmpl);
1858 int err;
1859
1860 err = validate_tmpl(nr, utmpl, pol->family, dir, extack);
1861 if (err)
1862 return err;
1863
1864 copy_templates(pol, utmpl, nr);
1865 }
1866 return 0;
1867}
1868
1869static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs,
1870 struct netlink_ext_ack *extack)
1871{
1872 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1873 struct xfrm_userpolicy_type *upt;
1874 u8 type = XFRM_POLICY_TYPE_MAIN;
1875 int err;
1876
1877 if (rt) {
1878 upt = nla_data(rt);
1879 type = upt->type;
1880 }
1881
1882 err = verify_policy_type(type, extack);
1883 if (err)
1884 return err;
1885
1886 *tp = type;
1887 return 0;
1888}
1889
1890static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1891{
1892 xp->priority = p->priority;
1893 xp->index = p->index;
1894 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1895 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1896 xp->action = p->action;
1897 xp->flags = p->flags;
1898 xp->family = p->sel.family;
1899 /* XXX xp->share = p->share; */
1900}
1901
1902static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1903{
1904 memset(p, 0, sizeof(*p));
1905 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1906 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1907 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1908 p->priority = xp->priority;
1909 p->index = xp->index;
1910 p->sel.family = xp->family;
1911 p->dir = dir;
1912 p->action = xp->action;
1913 p->flags = xp->flags;
1914 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1915}
1916
1917static struct xfrm_policy *xfrm_policy_construct(struct net *net,
1918 struct xfrm_userpolicy_info *p,
1919 struct nlattr **attrs,
1920 int *errp,
1921 struct netlink_ext_ack *extack)
1922{
1923 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1924 int err;
1925
1926 if (!xp) {
1927 *errp = -ENOMEM;
1928 return NULL;
1929 }
1930
1931 copy_from_user_policy(xp, p);
1932
1933 err = copy_from_user_policy_type(&xp->type, attrs, extack);
1934 if (err)
1935 goto error;
1936
1937 if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack)))
1938 err = copy_from_user_sec_ctx(xp, attrs);
1939 if (err)
1940 goto error;
1941
1942 xfrm_mark_get(attrs, &xp->mark);
1943
1944 if (attrs[XFRMA_IF_ID])
1945 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1946
1947 /* configure the hardware if offload is requested */
1948 if (attrs[XFRMA_OFFLOAD_DEV]) {
1949 err = xfrm_dev_policy_add(net, xp,
1950 nla_data(attrs[XFRMA_OFFLOAD_DEV]),
1951 p->dir, extack);
1952 if (err)
1953 goto error;
1954 }
1955
1956 return xp;
1957 error:
1958 *errp = err;
1959 xp->walk.dead = 1;
1960 xfrm_policy_destroy(xp);
1961 return NULL;
1962}
1963
1964static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1965 struct nlattr **attrs,
1966 struct netlink_ext_ack *extack)
1967{
1968 struct net *net = sock_net(skb->sk);
1969 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1970 struct xfrm_policy *xp;
1971 struct km_event c;
1972 int err;
1973 int excl;
1974
1975 err = verify_newpolicy_info(p, extack);
1976 if (err)
1977 return err;
1978 err = verify_sec_ctx_len(attrs, extack);
1979 if (err)
1980 return err;
1981
1982 xp = xfrm_policy_construct(net, p, attrs, &err, extack);
1983 if (!xp)
1984 return err;
1985
1986 /* shouldn't excl be based on nlh flags??
1987 * Aha! this is anti-netlink really i.e more pfkey derived
1988 * in netlink excl is a flag and you wouldn't need
1989 * a type XFRM_MSG_UPDPOLICY - JHS */
1990 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1991 err = xfrm_policy_insert(p->dir, xp, excl);
1992 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1993
1994 if (err) {
1995 xfrm_dev_policy_delete(xp);
1996 xfrm_dev_policy_free(xp);
1997 security_xfrm_policy_free(xp->security);
1998 kfree(xp);
1999 return err;
2000 }
2001
2002 c.event = nlh->nlmsg_type;
2003 c.seq = nlh->nlmsg_seq;
2004 c.portid = nlh->nlmsg_pid;
2005 km_policy_notify(xp, p->dir, &c);
2006
2007 xfrm_pol_put(xp);
2008
2009 return 0;
2010}
2011
2012static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
2013{
2014 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
2015 int i;
2016
2017 if (xp->xfrm_nr == 0)
2018 return 0;
2019
2020 if (xp->xfrm_nr > XFRM_MAX_DEPTH)
2021 return -ENOBUFS;
2022
2023 for (i = 0; i < xp->xfrm_nr; i++) {
2024 struct xfrm_user_tmpl *up = &vec[i];
2025 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
2026
2027 memset(up, 0, sizeof(*up));
2028 memcpy(&up->id, &kp->id, sizeof(up->id));
2029 up->family = kp->encap_family;
2030 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
2031 up->reqid = kp->reqid;
2032 up->mode = kp->mode;
2033 up->share = kp->share;
2034 up->optional = kp->optional;
2035 up->aalgos = kp->aalgos;
2036 up->ealgos = kp->ealgos;
2037 up->calgos = kp->calgos;
2038 }
2039
2040 return nla_put(skb, XFRMA_TMPL,
2041 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
2042}
2043
2044static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
2045{
2046 if (x->security) {
2047 return copy_sec_ctx(x->security, skb);
2048 }
2049 return 0;
2050}
2051
2052static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
2053{
2054 if (xp->security)
2055 return copy_sec_ctx(xp->security, skb);
2056 return 0;
2057}
2058static inline unsigned int userpolicy_type_attrsize(void)
2059{
2060#ifdef CONFIG_XFRM_SUB_POLICY
2061 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
2062#else
2063 return 0;
2064#endif
2065}
2066
2067#ifdef CONFIG_XFRM_SUB_POLICY
2068static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2069{
2070 struct xfrm_userpolicy_type upt;
2071
2072 /* Sadly there are two holes in struct xfrm_userpolicy_type */
2073 memset(&upt, 0, sizeof(upt));
2074 upt.type = type;
2075
2076 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2077}
2078
2079#else
2080static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
2081{
2082 return 0;
2083}
2084#endif
2085
2086static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
2087{
2088 struct xfrm_dump_info *sp = ptr;
2089 struct xfrm_userpolicy_info *p;
2090 struct sk_buff *in_skb = sp->in_skb;
2091 struct sk_buff *skb = sp->out_skb;
2092 struct xfrm_translator *xtr;
2093 struct nlmsghdr *nlh;
2094 int err;
2095
2096 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
2097 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
2098 if (nlh == NULL)
2099 return -EMSGSIZE;
2100
2101 p = nlmsg_data(nlh);
2102 copy_to_user_policy(xp, p, dir);
2103 err = copy_to_user_tmpl(xp, skb);
2104 if (!err)
2105 err = copy_to_user_sec_ctx(xp, skb);
2106 if (!err)
2107 err = copy_to_user_policy_type(xp->type, skb);
2108 if (!err)
2109 err = xfrm_mark_put(skb, &xp->mark);
2110 if (!err)
2111 err = xfrm_if_id_put(skb, xp->if_id);
2112 if (!err && xp->xdo.dev)
2113 err = copy_user_offload(&xp->xdo, skb);
2114 if (err) {
2115 nlmsg_cancel(skb, nlh);
2116 return err;
2117 }
2118 nlmsg_end(skb, nlh);
2119
2120 xtr = xfrm_get_translator();
2121 if (xtr) {
2122 err = xtr->alloc_compat(skb, nlh);
2123
2124 xfrm_put_translator(xtr);
2125 if (err) {
2126 nlmsg_cancel(skb, nlh);
2127 return err;
2128 }
2129 }
2130
2131 return 0;
2132}
2133
2134static int xfrm_dump_policy_done(struct netlink_callback *cb)
2135{
2136 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2137 struct net *net = sock_net(cb->skb->sk);
2138
2139 xfrm_policy_walk_done(walk, net);
2140 return 0;
2141}
2142
2143static int xfrm_dump_policy_start(struct netlink_callback *cb)
2144{
2145 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2146
2147 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
2148
2149 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
2150 return 0;
2151}
2152
2153static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
2154{
2155 struct net *net = sock_net(skb->sk);
2156 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
2157 struct xfrm_dump_info info;
2158
2159 info.in_skb = cb->skb;
2160 info.out_skb = skb;
2161 info.nlmsg_seq = cb->nlh->nlmsg_seq;
2162 info.nlmsg_flags = NLM_F_MULTI;
2163
2164 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
2165
2166 return skb->len;
2167}
2168
2169static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
2170 struct xfrm_policy *xp,
2171 int dir, u32 seq)
2172{
2173 struct xfrm_dump_info info;
2174 struct sk_buff *skb;
2175 int err;
2176
2177 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2178 if (!skb)
2179 return ERR_PTR(-ENOMEM);
2180
2181 info.in_skb = in_skb;
2182 info.out_skb = skb;
2183 info.nlmsg_seq = seq;
2184 info.nlmsg_flags = 0;
2185
2186 err = dump_one_policy(xp, dir, 0, &info);
2187 if (err) {
2188 kfree_skb(skb);
2189 return ERR_PTR(err);
2190 }
2191
2192 return skb;
2193}
2194
2195static int xfrm_notify_userpolicy(struct net *net)
2196{
2197 struct xfrm_userpolicy_default *up;
2198 int len = NLMSG_ALIGN(sizeof(*up));
2199 struct nlmsghdr *nlh;
2200 struct sk_buff *skb;
2201 int err;
2202
2203 skb = nlmsg_new(len, GFP_ATOMIC);
2204 if (skb == NULL)
2205 return -ENOMEM;
2206
2207 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
2208 if (nlh == NULL) {
2209 kfree_skb(skb);
2210 return -EMSGSIZE;
2211 }
2212
2213 up = nlmsg_data(nlh);
2214 up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2215 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2216 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2217
2218 nlmsg_end(skb, nlh);
2219
2220 rcu_read_lock();
2221 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2222 rcu_read_unlock();
2223
2224 return err;
2225}
2226
2227static bool xfrm_userpolicy_is_valid(__u8 policy)
2228{
2229 return policy == XFRM_USERPOLICY_BLOCK ||
2230 policy == XFRM_USERPOLICY_ACCEPT;
2231}
2232
2233static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2234 struct nlattr **attrs, struct netlink_ext_ack *extack)
2235{
2236 struct net *net = sock_net(skb->sk);
2237 struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2238
2239 if (xfrm_userpolicy_is_valid(up->in))
2240 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
2241
2242 if (xfrm_userpolicy_is_valid(up->fwd))
2243 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
2244
2245 if (xfrm_userpolicy_is_valid(up->out))
2246 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
2247
2248 rt_genid_bump_all(net);
2249
2250 xfrm_notify_userpolicy(net);
2251 return 0;
2252}
2253
2254static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2255 struct nlattr **attrs, struct netlink_ext_ack *extack)
2256{
2257 struct sk_buff *r_skb;
2258 struct nlmsghdr *r_nlh;
2259 struct net *net = sock_net(skb->sk);
2260 struct xfrm_userpolicy_default *r_up;
2261 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2262 u32 portid = NETLINK_CB(skb).portid;
2263 u32 seq = nlh->nlmsg_seq;
2264
2265 r_skb = nlmsg_new(len, GFP_ATOMIC);
2266 if (!r_skb)
2267 return -ENOMEM;
2268
2269 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2270 if (!r_nlh) {
2271 kfree_skb(r_skb);
2272 return -EMSGSIZE;
2273 }
2274
2275 r_up = nlmsg_data(r_nlh);
2276 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2277 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2278 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2279 nlmsg_end(r_skb, r_nlh);
2280
2281 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2282}
2283
2284static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2285 struct nlattr **attrs,
2286 struct netlink_ext_ack *extack)
2287{
2288 struct net *net = sock_net(skb->sk);
2289 struct xfrm_policy *xp;
2290 struct xfrm_userpolicy_id *p;
2291 u8 type = XFRM_POLICY_TYPE_MAIN;
2292 int err;
2293 struct km_event c;
2294 int delete;
2295 struct xfrm_mark m;
2296 u32 if_id = 0;
2297
2298 p = nlmsg_data(nlh);
2299 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2300
2301 err = copy_from_user_policy_type(&type, attrs, extack);
2302 if (err)
2303 return err;
2304
2305 err = verify_policy_dir(p->dir, extack);
2306 if (err)
2307 return err;
2308
2309 if (attrs[XFRMA_IF_ID])
2310 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2311
2312 xfrm_mark_get(attrs, &m);
2313
2314 if (p->index)
2315 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2316 p->index, delete, &err);
2317 else {
2318 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2319 struct xfrm_sec_ctx *ctx;
2320
2321 err = verify_sec_ctx_len(attrs, extack);
2322 if (err)
2323 return err;
2324
2325 ctx = NULL;
2326 if (rt) {
2327 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2328
2329 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2330 if (err)
2331 return err;
2332 }
2333 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2334 &p->sel, ctx, delete, &err);
2335 security_xfrm_policy_free(ctx);
2336 }
2337 if (xp == NULL)
2338 return -ENOENT;
2339
2340 if (!delete) {
2341 struct sk_buff *resp_skb;
2342
2343 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2344 if (IS_ERR(resp_skb)) {
2345 err = PTR_ERR(resp_skb);
2346 } else {
2347 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2348 NETLINK_CB(skb).portid);
2349 }
2350 } else {
2351 xfrm_dev_policy_delete(xp);
2352 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2353
2354 if (err != 0)
2355 goto out;
2356
2357 c.data.byid = p->index;
2358 c.event = nlh->nlmsg_type;
2359 c.seq = nlh->nlmsg_seq;
2360 c.portid = nlh->nlmsg_pid;
2361 km_policy_notify(xp, p->dir, &c);
2362 }
2363
2364out:
2365 xfrm_pol_put(xp);
2366 return err;
2367}
2368
2369static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2370 struct nlattr **attrs,
2371 struct netlink_ext_ack *extack)
2372{
2373 struct net *net = sock_net(skb->sk);
2374 struct km_event c;
2375 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2376 int err;
2377
2378 err = xfrm_state_flush(net, p->proto, true, false);
2379 if (err) {
2380 if (err == -ESRCH) /* empty table */
2381 return 0;
2382 return err;
2383 }
2384 c.data.proto = p->proto;
2385 c.event = nlh->nlmsg_type;
2386 c.seq = nlh->nlmsg_seq;
2387 c.portid = nlh->nlmsg_pid;
2388 c.net = net;
2389 km_state_notify(NULL, &c);
2390
2391 return 0;
2392}
2393
2394static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2395{
2396 unsigned int replay_size = x->replay_esn ?
2397 xfrm_replay_state_esn_len(x->replay_esn) :
2398 sizeof(struct xfrm_replay_state);
2399
2400 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2401 + nla_total_size(replay_size)
2402 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2403 + nla_total_size(sizeof(struct xfrm_mark))
2404 + nla_total_size(4) /* XFRM_AE_RTHR */
2405 + nla_total_size(4); /* XFRM_AE_ETHR */
2406}
2407
2408static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2409{
2410 struct xfrm_aevent_id *id;
2411 struct nlmsghdr *nlh;
2412 int err;
2413
2414 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2415 if (nlh == NULL)
2416 return -EMSGSIZE;
2417
2418 id = nlmsg_data(nlh);
2419 memset(&id->sa_id, 0, sizeof(id->sa_id));
2420 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2421 id->sa_id.spi = x->id.spi;
2422 id->sa_id.family = x->props.family;
2423 id->sa_id.proto = x->id.proto;
2424 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2425 id->reqid = x->props.reqid;
2426 id->flags = c->data.aevent;
2427
2428 if (x->replay_esn) {
2429 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2430 xfrm_replay_state_esn_len(x->replay_esn),
2431 x->replay_esn);
2432 } else {
2433 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2434 &x->replay);
2435 }
2436 if (err)
2437 goto out_cancel;
2438 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2439 XFRMA_PAD);
2440 if (err)
2441 goto out_cancel;
2442
2443 if (id->flags & XFRM_AE_RTHR) {
2444 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2445 if (err)
2446 goto out_cancel;
2447 }
2448 if (id->flags & XFRM_AE_ETHR) {
2449 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2450 x->replay_maxage * 10 / HZ);
2451 if (err)
2452 goto out_cancel;
2453 }
2454 err = xfrm_mark_put(skb, &x->mark);
2455 if (err)
2456 goto out_cancel;
2457
2458 err = xfrm_if_id_put(skb, x->if_id);
2459 if (err)
2460 goto out_cancel;
2461
2462 nlmsg_end(skb, nlh);
2463 return 0;
2464
2465out_cancel:
2466 nlmsg_cancel(skb, nlh);
2467 return err;
2468}
2469
2470static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2471 struct nlattr **attrs, struct netlink_ext_ack *extack)
2472{
2473 struct net *net = sock_net(skb->sk);
2474 struct xfrm_state *x;
2475 struct sk_buff *r_skb;
2476 int err;
2477 struct km_event c;
2478 u32 mark;
2479 struct xfrm_mark m;
2480 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2481 struct xfrm_usersa_id *id = &p->sa_id;
2482
2483 mark = xfrm_mark_get(attrs, &m);
2484
2485 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2486 if (x == NULL)
2487 return -ESRCH;
2488
2489 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2490 if (r_skb == NULL) {
2491 xfrm_state_put(x);
2492 return -ENOMEM;
2493 }
2494
2495 /*
2496 * XXX: is this lock really needed - none of the other
2497 * gets lock (the concern is things getting updated
2498 * while we are still reading) - jhs
2499 */
2500 spin_lock_bh(&x->lock);
2501 c.data.aevent = p->flags;
2502 c.seq = nlh->nlmsg_seq;
2503 c.portid = nlh->nlmsg_pid;
2504
2505 err = build_aevent(r_skb, x, &c);
2506 BUG_ON(err < 0);
2507
2508 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2509 spin_unlock_bh(&x->lock);
2510 xfrm_state_put(x);
2511 return err;
2512}
2513
2514static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2515 struct nlattr **attrs, struct netlink_ext_ack *extack)
2516{
2517 struct net *net = sock_net(skb->sk);
2518 struct xfrm_state *x;
2519 struct km_event c;
2520 int err = -EINVAL;
2521 u32 mark = 0;
2522 struct xfrm_mark m;
2523 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2524 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2525 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2526 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2527 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2528 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2529
2530 if (!lt && !rp && !re && !et && !rt) {
2531 NL_SET_ERR_MSG(extack, "Missing required attribute for AE");
2532 return err;
2533 }
2534
2535 /* pedantic mode - thou shalt sayeth replaceth */
2536 if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) {
2537 NL_SET_ERR_MSG(extack, "NLM_F_REPLACE flag is required");
2538 return err;
2539 }
2540
2541 mark = xfrm_mark_get(attrs, &m);
2542
2543 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2544 if (x == NULL)
2545 return -ESRCH;
2546
2547 if (x->km.state != XFRM_STATE_VALID) {
2548 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2549 goto out;
2550 }
2551
2552 err = xfrm_replay_verify_len(x->replay_esn, re, extack);
2553 if (err)
2554 goto out;
2555
2556 spin_lock_bh(&x->lock);
2557 xfrm_update_ae_params(x, attrs, 1);
2558 spin_unlock_bh(&x->lock);
2559
2560 c.event = nlh->nlmsg_type;
2561 c.seq = nlh->nlmsg_seq;
2562 c.portid = nlh->nlmsg_pid;
2563 c.data.aevent = XFRM_AE_CU;
2564 km_state_notify(x, &c);
2565 err = 0;
2566out:
2567 xfrm_state_put(x);
2568 return err;
2569}
2570
2571static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2572 struct nlattr **attrs,
2573 struct netlink_ext_ack *extack)
2574{
2575 struct net *net = sock_net(skb->sk);
2576 struct km_event c;
2577 u8 type = XFRM_POLICY_TYPE_MAIN;
2578 int err;
2579
2580 err = copy_from_user_policy_type(&type, attrs, extack);
2581 if (err)
2582 return err;
2583
2584 err = xfrm_policy_flush(net, type, true);
2585 if (err) {
2586 if (err == -ESRCH) /* empty table */
2587 return 0;
2588 return err;
2589 }
2590
2591 c.data.type = type;
2592 c.event = nlh->nlmsg_type;
2593 c.seq = nlh->nlmsg_seq;
2594 c.portid = nlh->nlmsg_pid;
2595 c.net = net;
2596 km_policy_notify(NULL, 0, &c);
2597 return 0;
2598}
2599
2600static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2601 struct nlattr **attrs,
2602 struct netlink_ext_ack *extack)
2603{
2604 struct net *net = sock_net(skb->sk);
2605 struct xfrm_policy *xp;
2606 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2607 struct xfrm_userpolicy_info *p = &up->pol;
2608 u8 type = XFRM_POLICY_TYPE_MAIN;
2609 int err = -ENOENT;
2610 struct xfrm_mark m;
2611 u32 if_id = 0;
2612
2613 err = copy_from_user_policy_type(&type, attrs, extack);
2614 if (err)
2615 return err;
2616
2617 err = verify_policy_dir(p->dir, extack);
2618 if (err)
2619 return err;
2620
2621 if (attrs[XFRMA_IF_ID])
2622 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2623
2624 xfrm_mark_get(attrs, &m);
2625
2626 if (p->index)
2627 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2628 0, &err);
2629 else {
2630 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2631 struct xfrm_sec_ctx *ctx;
2632
2633 err = verify_sec_ctx_len(attrs, extack);
2634 if (err)
2635 return err;
2636
2637 ctx = NULL;
2638 if (rt) {
2639 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2640
2641 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2642 if (err)
2643 return err;
2644 }
2645 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2646 &p->sel, ctx, 0, &err);
2647 security_xfrm_policy_free(ctx);
2648 }
2649 if (xp == NULL)
2650 return -ENOENT;
2651
2652 if (unlikely(xp->walk.dead))
2653 goto out;
2654
2655 err = 0;
2656 if (up->hard) {
2657 xfrm_policy_delete(xp, p->dir);
2658 xfrm_audit_policy_delete(xp, 1, true);
2659 }
2660 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2661
2662out:
2663 xfrm_pol_put(xp);
2664 return err;
2665}
2666
2667static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2668 struct nlattr **attrs,
2669 struct netlink_ext_ack *extack)
2670{
2671 struct net *net = sock_net(skb->sk);
2672 struct xfrm_state *x;
2673 int err;
2674 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2675 struct xfrm_usersa_info *p = &ue->state;
2676 struct xfrm_mark m;
2677 u32 mark = xfrm_mark_get(attrs, &m);
2678
2679 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2680
2681 err = -ENOENT;
2682 if (x == NULL)
2683 return err;
2684
2685 spin_lock_bh(&x->lock);
2686 err = -EINVAL;
2687 if (x->km.state != XFRM_STATE_VALID) {
2688 NL_SET_ERR_MSG(extack, "SA must be in VALID state");
2689 goto out;
2690 }
2691
2692 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2693
2694 if (ue->hard) {
2695 __xfrm_state_delete(x);
2696 xfrm_audit_state_delete(x, 1, true);
2697 }
2698 err = 0;
2699out:
2700 spin_unlock_bh(&x->lock);
2701 xfrm_state_put(x);
2702 return err;
2703}
2704
2705static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2706 struct nlattr **attrs,
2707 struct netlink_ext_ack *extack)
2708{
2709 struct net *net = sock_net(skb->sk);
2710 struct xfrm_policy *xp;
2711 struct xfrm_user_tmpl *ut;
2712 int i;
2713 struct nlattr *rt = attrs[XFRMA_TMPL];
2714 struct xfrm_mark mark;
2715
2716 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2717 struct xfrm_state *x = xfrm_state_alloc(net);
2718 int err = -ENOMEM;
2719
2720 if (!x)
2721 goto nomem;
2722
2723 xfrm_mark_get(attrs, &mark);
2724
2725 err = verify_newpolicy_info(&ua->policy, extack);
2726 if (err)
2727 goto free_state;
2728 err = verify_sec_ctx_len(attrs, extack);
2729 if (err)
2730 goto free_state;
2731
2732 /* build an XP */
2733 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack);
2734 if (!xp)
2735 goto free_state;
2736
2737 memcpy(&x->id, &ua->id, sizeof(ua->id));
2738 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2739 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2740 xp->mark.m = x->mark.m = mark.m;
2741 xp->mark.v = x->mark.v = mark.v;
2742 ut = nla_data(rt);
2743 /* extract the templates and for each call km_key */
2744 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2745 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2746 memcpy(&x->id, &t->id, sizeof(x->id));
2747 x->props.mode = t->mode;
2748 x->props.reqid = t->reqid;
2749 x->props.family = ut->family;
2750 t->aalgos = ua->aalgos;
2751 t->ealgos = ua->ealgos;
2752 t->calgos = ua->calgos;
2753 err = km_query(x, t, xp);
2754
2755 }
2756
2757 xfrm_state_free(x);
2758 kfree(xp);
2759
2760 return 0;
2761
2762free_state:
2763 xfrm_state_free(x);
2764nomem:
2765 return err;
2766}
2767
2768#ifdef CONFIG_XFRM_MIGRATE
2769static int copy_from_user_migrate(struct xfrm_migrate *ma,
2770 struct xfrm_kmaddress *k,
2771 struct nlattr **attrs, int *num,
2772 struct netlink_ext_ack *extack)
2773{
2774 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2775 struct xfrm_user_migrate *um;
2776 int i, num_migrate;
2777
2778 if (k != NULL) {
2779 struct xfrm_user_kmaddress *uk;
2780
2781 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2782 memcpy(&k->local, &uk->local, sizeof(k->local));
2783 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2784 k->family = uk->family;
2785 k->reserved = uk->reserved;
2786 }
2787
2788 um = nla_data(rt);
2789 num_migrate = nla_len(rt) / sizeof(*um);
2790
2791 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) {
2792 NL_SET_ERR_MSG(extack, "Invalid number of SAs to migrate, must be 0 < num <= XFRM_MAX_DEPTH (6)");
2793 return -EINVAL;
2794 }
2795
2796 for (i = 0; i < num_migrate; i++, um++, ma++) {
2797 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2798 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2799 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2800 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2801
2802 ma->proto = um->proto;
2803 ma->mode = um->mode;
2804 ma->reqid = um->reqid;
2805
2806 ma->old_family = um->old_family;
2807 ma->new_family = um->new_family;
2808 }
2809
2810 *num = i;
2811 return 0;
2812}
2813
2814static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2815 struct nlattr **attrs, struct netlink_ext_ack *extack)
2816{
2817 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2818 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2819 struct xfrm_kmaddress km, *kmp;
2820 u8 type;
2821 int err;
2822 int n = 0;
2823 struct net *net = sock_net(skb->sk);
2824 struct xfrm_encap_tmpl *encap = NULL;
2825 u32 if_id = 0;
2826
2827 if (!attrs[XFRMA_MIGRATE]) {
2828 NL_SET_ERR_MSG(extack, "Missing required MIGRATE attribute");
2829 return -EINVAL;
2830 }
2831
2832 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2833
2834 err = copy_from_user_policy_type(&type, attrs, extack);
2835 if (err)
2836 return err;
2837
2838 err = copy_from_user_migrate(m, kmp, attrs, &n, extack);
2839 if (err)
2840 return err;
2841
2842 if (!n)
2843 return 0;
2844
2845 if (attrs[XFRMA_ENCAP]) {
2846 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2847 sizeof(*encap), GFP_KERNEL);
2848 if (!encap)
2849 return -ENOMEM;
2850 }
2851
2852 if (attrs[XFRMA_IF_ID])
2853 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2854
2855 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap,
2856 if_id, extack);
2857
2858 kfree(encap);
2859
2860 return err;
2861}
2862#else
2863static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2864 struct nlattr **attrs, struct netlink_ext_ack *extack)
2865{
2866 return -ENOPROTOOPT;
2867}
2868#endif
2869
2870#ifdef CONFIG_XFRM_MIGRATE
2871static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2872{
2873 struct xfrm_user_migrate um;
2874
2875 memset(&um, 0, sizeof(um));
2876 um.proto = m->proto;
2877 um.mode = m->mode;
2878 um.reqid = m->reqid;
2879 um.old_family = m->old_family;
2880 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2881 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2882 um.new_family = m->new_family;
2883 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2884 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2885
2886 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2887}
2888
2889static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2890{
2891 struct xfrm_user_kmaddress uk;
2892
2893 memset(&uk, 0, sizeof(uk));
2894 uk.family = k->family;
2895 uk.reserved = k->reserved;
2896 memcpy(&uk.local, &k->local, sizeof(uk.local));
2897 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2898
2899 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2900}
2901
2902static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2903 int with_encp)
2904{
2905 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2906 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2907 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2908 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2909 + userpolicy_type_attrsize();
2910}
2911
2912static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2913 int num_migrate, const struct xfrm_kmaddress *k,
2914 const struct xfrm_selector *sel,
2915 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2916{
2917 const struct xfrm_migrate *mp;
2918 struct xfrm_userpolicy_id *pol_id;
2919 struct nlmsghdr *nlh;
2920 int i, err;
2921
2922 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2923 if (nlh == NULL)
2924 return -EMSGSIZE;
2925
2926 pol_id = nlmsg_data(nlh);
2927 /* copy data from selector, dir, and type to the pol_id */
2928 memset(pol_id, 0, sizeof(*pol_id));
2929 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2930 pol_id->dir = dir;
2931
2932 if (k != NULL) {
2933 err = copy_to_user_kmaddress(k, skb);
2934 if (err)
2935 goto out_cancel;
2936 }
2937 if (encap) {
2938 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2939 if (err)
2940 goto out_cancel;
2941 }
2942 err = copy_to_user_policy_type(type, skb);
2943 if (err)
2944 goto out_cancel;
2945 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2946 err = copy_to_user_migrate(mp, skb);
2947 if (err)
2948 goto out_cancel;
2949 }
2950
2951 nlmsg_end(skb, nlh);
2952 return 0;
2953
2954out_cancel:
2955 nlmsg_cancel(skb, nlh);
2956 return err;
2957}
2958
2959static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2960 const struct xfrm_migrate *m, int num_migrate,
2961 const struct xfrm_kmaddress *k,
2962 const struct xfrm_encap_tmpl *encap)
2963{
2964 struct net *net = &init_net;
2965 struct sk_buff *skb;
2966 int err;
2967
2968 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2969 GFP_ATOMIC);
2970 if (skb == NULL)
2971 return -ENOMEM;
2972
2973 /* build migrate */
2974 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2975 BUG_ON(err < 0);
2976
2977 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2978}
2979#else
2980static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2981 const struct xfrm_migrate *m, int num_migrate,
2982 const struct xfrm_kmaddress *k,
2983 const struct xfrm_encap_tmpl *encap)
2984{
2985 return -ENOPROTOOPT;
2986}
2987#endif
2988
2989#define XMSGSIZE(type) sizeof(struct type)
2990
2991const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2992 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2993 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2994 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2995 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2996 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2997 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2998 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2999 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
3000 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
3001 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
3002 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
3003 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
3004 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
3005 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
3006 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3007 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
3008 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
3009 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
3010 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
3011 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3012 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
3013 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3014 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
3015};
3016EXPORT_SYMBOL_GPL(xfrm_msg_min);
3017
3018#undef XMSGSIZE
3019
3020const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
3021 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
3022 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
3023 [XFRMA_LASTUSED] = { .type = NLA_U64},
3024 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
3025 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
3026 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
3027 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
3028 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
3029 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
3030 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
3031 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
3032 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
3033 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
3034 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
3035 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
3036 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
3037 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
3038 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
3039 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
3040 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
3041 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
3042 [XFRMA_TFCPAD] = { .type = NLA_U32 },
3043 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
3044 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
3045 [XFRMA_PROTO] = { .type = NLA_U8 },
3046 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
3047 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
3048 [XFRMA_SET_MARK] = { .type = NLA_U32 },
3049 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
3050 [XFRMA_IF_ID] = { .type = NLA_U32 },
3051 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
3052};
3053EXPORT_SYMBOL_GPL(xfrma_policy);
3054
3055static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
3056 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3057 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
3058};
3059
3060static const struct xfrm_link {
3061 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **,
3062 struct netlink_ext_ack *);
3063 int (*start)(struct netlink_callback *);
3064 int (*dump)(struct sk_buff *, struct netlink_callback *);
3065 int (*done)(struct netlink_callback *);
3066 const struct nla_policy *nla_pol;
3067 int nla_max;
3068} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
3069 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3070 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
3071 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
3072 .dump = xfrm_dump_sa,
3073 .done = xfrm_dump_sa_done },
3074 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3075 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
3076 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
3077 .start = xfrm_dump_policy_start,
3078 .dump = xfrm_dump_policy,
3079 .done = xfrm_dump_policy_done },
3080 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
3081 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
3082 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
3083 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
3084 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
3085 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
3086 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
3087 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
3088 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
3089 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
3090 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
3091 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
3092 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
3093 .nla_pol = xfrma_spd_policy,
3094 .nla_max = XFRMA_SPD_MAX },
3095 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
3096 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
3097 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
3098};
3099
3100static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
3101 struct netlink_ext_ack *extack)
3102{
3103 struct net *net = sock_net(skb->sk);
3104 struct nlattr *attrs[XFRMA_MAX+1];
3105 const struct xfrm_link *link;
3106 struct nlmsghdr *nlh64 = NULL;
3107 int type, err;
3108
3109 type = nlh->nlmsg_type;
3110 if (type > XFRM_MSG_MAX)
3111 return -EINVAL;
3112
3113 type -= XFRM_MSG_BASE;
3114 link = &xfrm_dispatch[type];
3115
3116 /* All operations require privileges, even GET */
3117 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
3118 return -EPERM;
3119
3120 if (in_compat_syscall()) {
3121 struct xfrm_translator *xtr = xfrm_get_translator();
3122
3123 if (!xtr)
3124 return -EOPNOTSUPP;
3125
3126 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
3127 link->nla_pol, extack);
3128 xfrm_put_translator(xtr);
3129 if (IS_ERR(nlh64))
3130 return PTR_ERR(nlh64);
3131 if (nlh64)
3132 nlh = nlh64;
3133 }
3134
3135 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
3136 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
3137 (nlh->nlmsg_flags & NLM_F_DUMP)) {
3138 struct netlink_dump_control c = {
3139 .start = link->start,
3140 .dump = link->dump,
3141 .done = link->done,
3142 };
3143
3144 if (link->dump == NULL) {
3145 err = -EINVAL;
3146 goto err;
3147 }
3148
3149 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
3150 goto err;
3151 }
3152
3153 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
3154 link->nla_max ? : XFRMA_MAX,
3155 link->nla_pol ? : xfrma_policy, extack);
3156 if (err < 0)
3157 goto err;
3158
3159 if (link->doit == NULL) {
3160 err = -EINVAL;
3161 goto err;
3162 }
3163
3164 err = link->doit(skb, nlh, attrs, extack);
3165
3166 /* We need to free skb allocated in xfrm_alloc_compat() before
3167 * returning from this function, because consume_skb() won't take
3168 * care of frag_list since netlink destructor sets
3169 * sbk->head to NULL. (see netlink_skb_destructor())
3170 */
3171 if (skb_has_frag_list(skb)) {
3172 kfree_skb(skb_shinfo(skb)->frag_list);
3173 skb_shinfo(skb)->frag_list = NULL;
3174 }
3175
3176err:
3177 kvfree(nlh64);
3178 return err;
3179}
3180
3181static void xfrm_netlink_rcv(struct sk_buff *skb)
3182{
3183 struct net *net = sock_net(skb->sk);
3184
3185 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3186 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
3187 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3188}
3189
3190static inline unsigned int xfrm_expire_msgsize(void)
3191{
3192 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
3193 + nla_total_size(sizeof(struct xfrm_mark));
3194}
3195
3196static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
3197{
3198 struct xfrm_user_expire *ue;
3199 struct nlmsghdr *nlh;
3200 int err;
3201
3202 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
3203 if (nlh == NULL)
3204 return -EMSGSIZE;
3205
3206 ue = nlmsg_data(nlh);
3207 copy_to_user_state(x, &ue->state);
3208 ue->hard = (c->data.hard != 0) ? 1 : 0;
3209 /* clear the padding bytes */
3210 memset_after(ue, 0, hard);
3211
3212 err = xfrm_mark_put(skb, &x->mark);
3213 if (err)
3214 return err;
3215
3216 err = xfrm_if_id_put(skb, x->if_id);
3217 if (err)
3218 return err;
3219
3220 nlmsg_end(skb, nlh);
3221 return 0;
3222}
3223
3224static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
3225{
3226 struct net *net = xs_net(x);
3227 struct sk_buff *skb;
3228
3229 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
3230 if (skb == NULL)
3231 return -ENOMEM;
3232
3233 if (build_expire(skb, x, c) < 0) {
3234 kfree_skb(skb);
3235 return -EMSGSIZE;
3236 }
3237
3238 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3239}
3240
3241static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
3242{
3243 struct net *net = xs_net(x);
3244 struct sk_buff *skb;
3245 int err;
3246
3247 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
3248 if (skb == NULL)
3249 return -ENOMEM;
3250
3251 err = build_aevent(skb, x, c);
3252 BUG_ON(err < 0);
3253
3254 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3255}
3256
3257static int xfrm_notify_sa_flush(const struct km_event *c)
3258{
3259 struct net *net = c->net;
3260 struct xfrm_usersa_flush *p;
3261 struct nlmsghdr *nlh;
3262 struct sk_buff *skb;
3263 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3264
3265 skb = nlmsg_new(len, GFP_ATOMIC);
3266 if (skb == NULL)
3267 return -ENOMEM;
3268
3269 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3270 if (nlh == NULL) {
3271 kfree_skb(skb);
3272 return -EMSGSIZE;
3273 }
3274
3275 p = nlmsg_data(nlh);
3276 p->proto = c->data.proto;
3277
3278 nlmsg_end(skb, nlh);
3279
3280 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3281}
3282
3283static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3284{
3285 unsigned int l = 0;
3286 if (x->aead)
3287 l += nla_total_size(aead_len(x->aead));
3288 if (x->aalg) {
3289 l += nla_total_size(sizeof(struct xfrm_algo) +
3290 (x->aalg->alg_key_len + 7) / 8);
3291 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3292 }
3293 if (x->ealg)
3294 l += nla_total_size(xfrm_alg_len(x->ealg));
3295 if (x->calg)
3296 l += nla_total_size(sizeof(*x->calg));
3297 if (x->encap)
3298 l += nla_total_size(sizeof(*x->encap));
3299 if (x->tfcpad)
3300 l += nla_total_size(sizeof(x->tfcpad));
3301 if (x->replay_esn)
3302 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3303 else
3304 l += nla_total_size(sizeof(struct xfrm_replay_state));
3305 if (x->security)
3306 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3307 x->security->ctx_len);
3308 if (x->coaddr)
3309 l += nla_total_size(sizeof(*x->coaddr));
3310 if (x->props.extra_flags)
3311 l += nla_total_size(sizeof(x->props.extra_flags));
3312 if (x->xso.dev)
3313 l += nla_total_size(sizeof(struct xfrm_user_offload));
3314 if (x->props.smark.v | x->props.smark.m) {
3315 l += nla_total_size(sizeof(x->props.smark.v));
3316 l += nla_total_size(sizeof(x->props.smark.m));
3317 }
3318 if (x->if_id)
3319 l += nla_total_size(sizeof(x->if_id));
3320
3321 /* Must count x->lastused as it may become non-zero behind our back. */
3322 l += nla_total_size_64bit(sizeof(u64));
3323
3324 if (x->mapping_maxage)
3325 l += nla_total_size(sizeof(x->mapping_maxage));
3326
3327 return l;
3328}
3329
3330static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3331{
3332 struct net *net = xs_net(x);
3333 struct xfrm_usersa_info *p;
3334 struct xfrm_usersa_id *id;
3335 struct nlmsghdr *nlh;
3336 struct sk_buff *skb;
3337 unsigned int len = xfrm_sa_len(x);
3338 unsigned int headlen;
3339 int err;
3340
3341 headlen = sizeof(*p);
3342 if (c->event == XFRM_MSG_DELSA) {
3343 len += nla_total_size(headlen);
3344 headlen = sizeof(*id);
3345 len += nla_total_size(sizeof(struct xfrm_mark));
3346 }
3347 len += NLMSG_ALIGN(headlen);
3348
3349 skb = nlmsg_new(len, GFP_ATOMIC);
3350 if (skb == NULL)
3351 return -ENOMEM;
3352
3353 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3354 err = -EMSGSIZE;
3355 if (nlh == NULL)
3356 goto out_free_skb;
3357
3358 p = nlmsg_data(nlh);
3359 if (c->event == XFRM_MSG_DELSA) {
3360 struct nlattr *attr;
3361
3362 id = nlmsg_data(nlh);
3363 memset(id, 0, sizeof(*id));
3364 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3365 id->spi = x->id.spi;
3366 id->family = x->props.family;
3367 id->proto = x->id.proto;
3368
3369 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3370 err = -EMSGSIZE;
3371 if (attr == NULL)
3372 goto out_free_skb;
3373
3374 p = nla_data(attr);
3375 }
3376 err = copy_to_user_state_extra(x, p, skb);
3377 if (err)
3378 goto out_free_skb;
3379
3380 nlmsg_end(skb, nlh);
3381
3382 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3383
3384out_free_skb:
3385 kfree_skb(skb);
3386 return err;
3387}
3388
3389static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3390{
3391
3392 switch (c->event) {
3393 case XFRM_MSG_EXPIRE:
3394 return xfrm_exp_state_notify(x, c);
3395 case XFRM_MSG_NEWAE:
3396 return xfrm_aevent_state_notify(x, c);
3397 case XFRM_MSG_DELSA:
3398 case XFRM_MSG_UPDSA:
3399 case XFRM_MSG_NEWSA:
3400 return xfrm_notify_sa(x, c);
3401 case XFRM_MSG_FLUSHSA:
3402 return xfrm_notify_sa_flush(c);
3403 default:
3404 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3405 c->event);
3406 break;
3407 }
3408
3409 return 0;
3410
3411}
3412
3413static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3414 struct xfrm_policy *xp)
3415{
3416 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3417 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3418 + nla_total_size(sizeof(struct xfrm_mark))
3419 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3420 + userpolicy_type_attrsize();
3421}
3422
3423static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3424 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3425{
3426 __u32 seq = xfrm_get_acqseq();
3427 struct xfrm_user_acquire *ua;
3428 struct nlmsghdr *nlh;
3429 int err;
3430
3431 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3432 if (nlh == NULL)
3433 return -EMSGSIZE;
3434
3435 ua = nlmsg_data(nlh);
3436 memcpy(&ua->id, &x->id, sizeof(ua->id));
3437 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3438 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3439 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3440 ua->aalgos = xt->aalgos;
3441 ua->ealgos = xt->ealgos;
3442 ua->calgos = xt->calgos;
3443 ua->seq = x->km.seq = seq;
3444
3445 err = copy_to_user_tmpl(xp, skb);
3446 if (!err)
3447 err = copy_to_user_state_sec_ctx(x, skb);
3448 if (!err)
3449 err = copy_to_user_policy_type(xp->type, skb);
3450 if (!err)
3451 err = xfrm_mark_put(skb, &xp->mark);
3452 if (!err)
3453 err = xfrm_if_id_put(skb, xp->if_id);
3454 if (!err && xp->xdo.dev)
3455 err = copy_user_offload(&xp->xdo, skb);
3456 if (err) {
3457 nlmsg_cancel(skb, nlh);
3458 return err;
3459 }
3460
3461 nlmsg_end(skb, nlh);
3462 return 0;
3463}
3464
3465static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3466 struct xfrm_policy *xp)
3467{
3468 struct net *net = xs_net(x);
3469 struct sk_buff *skb;
3470 int err;
3471
3472 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3473 if (skb == NULL)
3474 return -ENOMEM;
3475
3476 err = build_acquire(skb, x, xt, xp);
3477 BUG_ON(err < 0);
3478
3479 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3480}
3481
3482/* User gives us xfrm_user_policy_info followed by an array of 0
3483 * or more templates.
3484 */
3485static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3486 u8 *data, int len, int *dir)
3487{
3488 struct net *net = sock_net(sk);
3489 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3490 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3491 struct xfrm_policy *xp;
3492 int nr;
3493
3494 switch (sk->sk_family) {
3495 case AF_INET:
3496 if (opt != IP_XFRM_POLICY) {
3497 *dir = -EOPNOTSUPP;
3498 return NULL;
3499 }
3500 break;
3501#if IS_ENABLED(CONFIG_IPV6)
3502 case AF_INET6:
3503 if (opt != IPV6_XFRM_POLICY) {
3504 *dir = -EOPNOTSUPP;
3505 return NULL;
3506 }
3507 break;
3508#endif
3509 default:
3510 *dir = -EINVAL;
3511 return NULL;
3512 }
3513
3514 *dir = -EINVAL;
3515
3516 if (len < sizeof(*p) ||
3517 verify_newpolicy_info(p, NULL))
3518 return NULL;
3519
3520 nr = ((len - sizeof(*p)) / sizeof(*ut));
3521 if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL))
3522 return NULL;
3523
3524 if (p->dir > XFRM_POLICY_OUT)
3525 return NULL;
3526
3527 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3528 if (xp == NULL) {
3529 *dir = -ENOBUFS;
3530 return NULL;
3531 }
3532
3533 copy_from_user_policy(xp, p);
3534 xp->type = XFRM_POLICY_TYPE_MAIN;
3535 copy_templates(xp, ut, nr);
3536
3537 *dir = p->dir;
3538
3539 return xp;
3540}
3541
3542static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3543{
3544 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3545 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3546 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3547 + nla_total_size(sizeof(struct xfrm_mark))
3548 + userpolicy_type_attrsize();
3549}
3550
3551static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3552 int dir, const struct km_event *c)
3553{
3554 struct xfrm_user_polexpire *upe;
3555 int hard = c->data.hard;
3556 struct nlmsghdr *nlh;
3557 int err;
3558
3559 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3560 if (nlh == NULL)
3561 return -EMSGSIZE;
3562
3563 upe = nlmsg_data(nlh);
3564 copy_to_user_policy(xp, &upe->pol, dir);
3565 err = copy_to_user_tmpl(xp, skb);
3566 if (!err)
3567 err = copy_to_user_sec_ctx(xp, skb);
3568 if (!err)
3569 err = copy_to_user_policy_type(xp->type, skb);
3570 if (!err)
3571 err = xfrm_mark_put(skb, &xp->mark);
3572 if (!err)
3573 err = xfrm_if_id_put(skb, xp->if_id);
3574 if (!err && xp->xdo.dev)
3575 err = copy_user_offload(&xp->xdo, skb);
3576 if (err) {
3577 nlmsg_cancel(skb, nlh);
3578 return err;
3579 }
3580 upe->hard = !!hard;
3581
3582 nlmsg_end(skb, nlh);
3583 return 0;
3584}
3585
3586static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3587{
3588 struct net *net = xp_net(xp);
3589 struct sk_buff *skb;
3590 int err;
3591
3592 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3593 if (skb == NULL)
3594 return -ENOMEM;
3595
3596 err = build_polexpire(skb, xp, dir, c);
3597 BUG_ON(err < 0);
3598
3599 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3600}
3601
3602static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3603{
3604 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3605 struct net *net = xp_net(xp);
3606 struct xfrm_userpolicy_info *p;
3607 struct xfrm_userpolicy_id *id;
3608 struct nlmsghdr *nlh;
3609 struct sk_buff *skb;
3610 unsigned int headlen;
3611 int err;
3612
3613 headlen = sizeof(*p);
3614 if (c->event == XFRM_MSG_DELPOLICY) {
3615 len += nla_total_size(headlen);
3616 headlen = sizeof(*id);
3617 }
3618 len += userpolicy_type_attrsize();
3619 len += nla_total_size(sizeof(struct xfrm_mark));
3620 len += NLMSG_ALIGN(headlen);
3621
3622 skb = nlmsg_new(len, GFP_ATOMIC);
3623 if (skb == NULL)
3624 return -ENOMEM;
3625
3626 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3627 err = -EMSGSIZE;
3628 if (nlh == NULL)
3629 goto out_free_skb;
3630
3631 p = nlmsg_data(nlh);
3632 if (c->event == XFRM_MSG_DELPOLICY) {
3633 struct nlattr *attr;
3634
3635 id = nlmsg_data(nlh);
3636 memset(id, 0, sizeof(*id));
3637 id->dir = dir;
3638 if (c->data.byid)
3639 id->index = xp->index;
3640 else
3641 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3642
3643 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3644 err = -EMSGSIZE;
3645 if (attr == NULL)
3646 goto out_free_skb;
3647
3648 p = nla_data(attr);
3649 }
3650
3651 copy_to_user_policy(xp, p, dir);
3652 err = copy_to_user_tmpl(xp, skb);
3653 if (!err)
3654 err = copy_to_user_policy_type(xp->type, skb);
3655 if (!err)
3656 err = xfrm_mark_put(skb, &xp->mark);
3657 if (!err)
3658 err = xfrm_if_id_put(skb, xp->if_id);
3659 if (!err && xp->xdo.dev)
3660 err = copy_user_offload(&xp->xdo, skb);
3661 if (err)
3662 goto out_free_skb;
3663
3664 nlmsg_end(skb, nlh);
3665
3666 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3667
3668out_free_skb:
3669 kfree_skb(skb);
3670 return err;
3671}
3672
3673static int xfrm_notify_policy_flush(const struct km_event *c)
3674{
3675 struct net *net = c->net;
3676 struct nlmsghdr *nlh;
3677 struct sk_buff *skb;
3678 int err;
3679
3680 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3681 if (skb == NULL)
3682 return -ENOMEM;
3683
3684 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3685 err = -EMSGSIZE;
3686 if (nlh == NULL)
3687 goto out_free_skb;
3688 err = copy_to_user_policy_type(c->data.type, skb);
3689 if (err)
3690 goto out_free_skb;
3691
3692 nlmsg_end(skb, nlh);
3693
3694 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3695
3696out_free_skb:
3697 kfree_skb(skb);
3698 return err;
3699}
3700
3701static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3702{
3703
3704 switch (c->event) {
3705 case XFRM_MSG_NEWPOLICY:
3706 case XFRM_MSG_UPDPOLICY:
3707 case XFRM_MSG_DELPOLICY:
3708 return xfrm_notify_policy(xp, dir, c);
3709 case XFRM_MSG_FLUSHPOLICY:
3710 return xfrm_notify_policy_flush(c);
3711 case XFRM_MSG_POLEXPIRE:
3712 return xfrm_exp_policy_notify(xp, dir, c);
3713 default:
3714 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3715 c->event);
3716 }
3717
3718 return 0;
3719
3720}
3721
3722static inline unsigned int xfrm_report_msgsize(void)
3723{
3724 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3725}
3726
3727static int build_report(struct sk_buff *skb, u8 proto,
3728 struct xfrm_selector *sel, xfrm_address_t *addr)
3729{
3730 struct xfrm_user_report *ur;
3731 struct nlmsghdr *nlh;
3732
3733 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3734 if (nlh == NULL)
3735 return -EMSGSIZE;
3736
3737 ur = nlmsg_data(nlh);
3738 ur->proto = proto;
3739 memcpy(&ur->sel, sel, sizeof(ur->sel));
3740
3741 if (addr) {
3742 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3743 if (err) {
3744 nlmsg_cancel(skb, nlh);
3745 return err;
3746 }
3747 }
3748 nlmsg_end(skb, nlh);
3749 return 0;
3750}
3751
3752static int xfrm_send_report(struct net *net, u8 proto,
3753 struct xfrm_selector *sel, xfrm_address_t *addr)
3754{
3755 struct sk_buff *skb;
3756 int err;
3757
3758 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3759 if (skb == NULL)
3760 return -ENOMEM;
3761
3762 err = build_report(skb, proto, sel, addr);
3763 BUG_ON(err < 0);
3764
3765 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3766}
3767
3768static inline unsigned int xfrm_mapping_msgsize(void)
3769{
3770 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3771}
3772
3773static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3774 xfrm_address_t *new_saddr, __be16 new_sport)
3775{
3776 struct xfrm_user_mapping *um;
3777 struct nlmsghdr *nlh;
3778
3779 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3780 if (nlh == NULL)
3781 return -EMSGSIZE;
3782
3783 um = nlmsg_data(nlh);
3784
3785 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3786 um->id.spi = x->id.spi;
3787 um->id.family = x->props.family;
3788 um->id.proto = x->id.proto;
3789 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3790 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3791 um->new_sport = new_sport;
3792 um->old_sport = x->encap->encap_sport;
3793 um->reqid = x->props.reqid;
3794
3795 nlmsg_end(skb, nlh);
3796 return 0;
3797}
3798
3799static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3800 __be16 sport)
3801{
3802 struct net *net = xs_net(x);
3803 struct sk_buff *skb;
3804 int err;
3805
3806 if (x->id.proto != IPPROTO_ESP)
3807 return -EINVAL;
3808
3809 if (!x->encap)
3810 return -EINVAL;
3811
3812 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3813 if (skb == NULL)
3814 return -ENOMEM;
3815
3816 err = build_mapping(skb, x, ipaddr, sport);
3817 BUG_ON(err < 0);
3818
3819 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3820}
3821
3822static bool xfrm_is_alive(const struct km_event *c)
3823{
3824 return (bool)xfrm_acquire_is_on(c->net);
3825}
3826
3827static struct xfrm_mgr netlink_mgr = {
3828 .notify = xfrm_send_state_notify,
3829 .acquire = xfrm_send_acquire,
3830 .compile_policy = xfrm_compile_policy,
3831 .notify_policy = xfrm_send_policy_notify,
3832 .report = xfrm_send_report,
3833 .migrate = xfrm_send_migrate,
3834 .new_mapping = xfrm_send_mapping,
3835 .is_alive = xfrm_is_alive,
3836};
3837
3838static int __net_init xfrm_user_net_init(struct net *net)
3839{
3840 struct sock *nlsk;
3841 struct netlink_kernel_cfg cfg = {
3842 .groups = XFRMNLGRP_MAX,
3843 .input = xfrm_netlink_rcv,
3844 };
3845
3846 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3847 if (nlsk == NULL)
3848 return -ENOMEM;
3849 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3850 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3851 return 0;
3852}
3853
3854static void __net_exit xfrm_user_net_pre_exit(struct net *net)
3855{
3856 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3857}
3858
3859static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3860{
3861 struct net *net;
3862
3863 list_for_each_entry(net, net_exit_list, exit_list)
3864 netlink_kernel_release(net->xfrm.nlsk_stash);
3865}
3866
3867static struct pernet_operations xfrm_user_net_ops = {
3868 .init = xfrm_user_net_init,
3869 .pre_exit = xfrm_user_net_pre_exit,
3870 .exit_batch = xfrm_user_net_exit,
3871};
3872
3873static int __init xfrm_user_init(void)
3874{
3875 int rv;
3876
3877 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3878
3879 rv = register_pernet_subsys(&xfrm_user_net_ops);
3880 if (rv < 0)
3881 return rv;
3882 xfrm_register_km(&netlink_mgr);
3883 return 0;
3884}
3885
3886static void __exit xfrm_user_exit(void)
3887{
3888 xfrm_unregister_km(&netlink_mgr);
3889 unregister_pernet_subsys(&xfrm_user_net_ops);
3890}
3891
3892module_init(xfrm_user_init);
3893module_exit(xfrm_user_exit);
3894MODULE_DESCRIPTION("XFRM User interface");
3895MODULE_LICENSE("GPL");
3896MODULE_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 <asm/uaccess.h>
31#if IS_ENABLED(CONFIG_IPV6)
32#include <linux/in6.h>
33#endif
34
35static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
36{
37 struct nlattr *rt = attrs[type];
38 struct xfrm_algo *algp;
39
40 if (!rt)
41 return 0;
42
43 algp = nla_data(rt);
44 if (nla_len(rt) < xfrm_alg_len(algp))
45 return -EINVAL;
46
47 switch (type) {
48 case XFRMA_ALG_AUTH:
49 case XFRMA_ALG_CRYPT:
50 case XFRMA_ALG_COMP:
51 break;
52
53 default:
54 return -EINVAL;
55 }
56
57 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
58 return 0;
59}
60
61static int verify_auth_trunc(struct nlattr **attrs)
62{
63 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
64 struct xfrm_algo_auth *algp;
65
66 if (!rt)
67 return 0;
68
69 algp = nla_data(rt);
70 if (nla_len(rt) < xfrm_alg_auth_len(algp))
71 return -EINVAL;
72
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 return 0;
75}
76
77static int verify_aead(struct nlattr **attrs)
78{
79 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
80 struct xfrm_algo_aead *algp;
81
82 if (!rt)
83 return 0;
84
85 algp = nla_data(rt);
86 if (nla_len(rt) < aead_len(algp))
87 return -EINVAL;
88
89 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
90 return 0;
91}
92
93static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
94 xfrm_address_t **addrp)
95{
96 struct nlattr *rt = attrs[type];
97
98 if (rt && addrp)
99 *addrp = nla_data(rt);
100}
101
102static inline int verify_sec_ctx_len(struct nlattr **attrs)
103{
104 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
105 struct xfrm_user_sec_ctx *uctx;
106
107 if (!rt)
108 return 0;
109
110 uctx = nla_data(rt);
111 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
112 return -EINVAL;
113
114 return 0;
115}
116
117static inline int verify_replay(struct xfrm_usersa_info *p,
118 struct nlattr **attrs)
119{
120 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
121 struct xfrm_replay_state_esn *rs;
122
123 if (p->flags & XFRM_STATE_ESN) {
124 if (!rt)
125 return -EINVAL;
126
127 rs = nla_data(rt);
128
129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 return -EINVAL;
131
132 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133 nla_len(rt) != sizeof(*rs))
134 return -EINVAL;
135 }
136
137 if (!rt)
138 return 0;
139
140 /* As only ESP and AH support ESN feature. */
141 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
142 return -EINVAL;
143
144 if (p->replay_window != 0)
145 return -EINVAL;
146
147 return 0;
148}
149
150static int verify_newsa_info(struct xfrm_usersa_info *p,
151 struct nlattr **attrs)
152{
153 int err;
154
155 err = -EINVAL;
156 switch (p->family) {
157 case AF_INET:
158 break;
159
160 case AF_INET6:
161#if IS_ENABLED(CONFIG_IPV6)
162 break;
163#else
164 err = -EAFNOSUPPORT;
165 goto out;
166#endif
167
168 default:
169 goto out;
170 }
171
172 err = -EINVAL;
173 switch (p->id.proto) {
174 case IPPROTO_AH:
175 if ((!attrs[XFRMA_ALG_AUTH] &&
176 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
177 attrs[XFRMA_ALG_AEAD] ||
178 attrs[XFRMA_ALG_CRYPT] ||
179 attrs[XFRMA_ALG_COMP] ||
180 attrs[XFRMA_TFCPAD] ||
181 (ntohl(p->id.spi) >= 0x10000))
182
183 goto out;
184 break;
185
186 case IPPROTO_ESP:
187 if (attrs[XFRMA_ALG_COMP])
188 goto out;
189 if (!attrs[XFRMA_ALG_AUTH] &&
190 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
191 !attrs[XFRMA_ALG_CRYPT] &&
192 !attrs[XFRMA_ALG_AEAD])
193 goto out;
194 if ((attrs[XFRMA_ALG_AUTH] ||
195 attrs[XFRMA_ALG_AUTH_TRUNC] ||
196 attrs[XFRMA_ALG_CRYPT]) &&
197 attrs[XFRMA_ALG_AEAD])
198 goto out;
199 if (attrs[XFRMA_TFCPAD] &&
200 p->mode != XFRM_MODE_TUNNEL)
201 goto out;
202 break;
203
204 case IPPROTO_COMP:
205 if (!attrs[XFRMA_ALG_COMP] ||
206 attrs[XFRMA_ALG_AEAD] ||
207 attrs[XFRMA_ALG_AUTH] ||
208 attrs[XFRMA_ALG_AUTH_TRUNC] ||
209 attrs[XFRMA_ALG_CRYPT] ||
210 attrs[XFRMA_TFCPAD])
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_auth(struct xfrm_algo_auth **algpp, u8 *props,
294 struct nlattr *rta)
295{
296 struct xfrm_algo *ualg;
297 struct xfrm_algo_auth *p;
298 struct xfrm_algo_desc *algo;
299
300 if (!rta)
301 return 0;
302
303 ualg = nla_data(rta);
304
305 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
306 if (!algo)
307 return -ENOSYS;
308 *props = algo->desc.sadb_alg_id;
309
310 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
311 if (!p)
312 return -ENOMEM;
313
314 strcpy(p->alg_name, algo->name);
315 p->alg_key_len = ualg->alg_key_len;
316 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
317 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
318
319 *algpp = p;
320 return 0;
321}
322
323static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
324 struct nlattr *rta)
325{
326 struct xfrm_algo_auth *p, *ualg;
327 struct xfrm_algo_desc *algo;
328
329 if (!rta)
330 return 0;
331
332 ualg = nla_data(rta);
333
334 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
335 if (!algo)
336 return -ENOSYS;
337 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
338 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
339 return -EINVAL;
340 *props = algo->desc.sadb_alg_id;
341
342 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
343 if (!p)
344 return -ENOMEM;
345
346 strcpy(p->alg_name, algo->name);
347 if (!p->alg_trunc_len)
348 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
349
350 *algpp = p;
351 return 0;
352}
353
354static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
355 struct nlattr *rta)
356{
357 struct xfrm_algo_aead *p, *ualg;
358 struct xfrm_algo_desc *algo;
359
360 if (!rta)
361 return 0;
362
363 ualg = nla_data(rta);
364
365 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
366 if (!algo)
367 return -ENOSYS;
368 *props = algo->desc.sadb_alg_id;
369
370 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
371 if (!p)
372 return -ENOMEM;
373
374 strcpy(p->alg_name, algo->name);
375 *algpp = p;
376 return 0;
377}
378
379static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
380 struct nlattr *rp)
381{
382 struct xfrm_replay_state_esn *up;
383 int ulen;
384
385 if (!replay_esn || !rp)
386 return 0;
387
388 up = nla_data(rp);
389 ulen = xfrm_replay_state_esn_len(up);
390
391 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
392 return -EINVAL;
393
394 return 0;
395}
396
397static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
398 struct xfrm_replay_state_esn **preplay_esn,
399 struct nlattr *rta)
400{
401 struct xfrm_replay_state_esn *p, *pp, *up;
402 int klen, ulen;
403
404 if (!rta)
405 return 0;
406
407 up = nla_data(rta);
408 klen = xfrm_replay_state_esn_len(up);
409 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
410
411 p = kzalloc(klen, GFP_KERNEL);
412 if (!p)
413 return -ENOMEM;
414
415 pp = kzalloc(klen, GFP_KERNEL);
416 if (!pp) {
417 kfree(p);
418 return -ENOMEM;
419 }
420
421 memcpy(p, up, ulen);
422 memcpy(pp, up, ulen);
423
424 *replay_esn = p;
425 *preplay_esn = pp;
426
427 return 0;
428}
429
430static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
431{
432 int len = 0;
433
434 if (xfrm_ctx) {
435 len += sizeof(struct xfrm_user_sec_ctx);
436 len += xfrm_ctx->ctx_len;
437 }
438 return len;
439}
440
441static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
442{
443 memcpy(&x->id, &p->id, sizeof(x->id));
444 memcpy(&x->sel, &p->sel, sizeof(x->sel));
445 memcpy(&x->lft, &p->lft, sizeof(x->lft));
446 x->props.mode = p->mode;
447 x->props.replay_window = min_t(unsigned int, p->replay_window,
448 sizeof(x->replay.bitmap) * 8);
449 x->props.reqid = p->reqid;
450 x->props.family = p->family;
451 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
452 x->props.flags = p->flags;
453
454 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
455 x->sel.family = p->family;
456}
457
458/*
459 * someday when pfkey also has support, we could have the code
460 * somehow made shareable and move it to xfrm_state.c - JHS
461 *
462*/
463static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
464 int update_esn)
465{
466 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
467 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
468 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
469 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
470 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
471
472 if (re) {
473 struct xfrm_replay_state_esn *replay_esn;
474 replay_esn = nla_data(re);
475 memcpy(x->replay_esn, replay_esn,
476 xfrm_replay_state_esn_len(replay_esn));
477 memcpy(x->preplay_esn, replay_esn,
478 xfrm_replay_state_esn_len(replay_esn));
479 }
480
481 if (rp) {
482 struct xfrm_replay_state *replay;
483 replay = nla_data(rp);
484 memcpy(&x->replay, replay, sizeof(*replay));
485 memcpy(&x->preplay, replay, sizeof(*replay));
486 }
487
488 if (lt) {
489 struct xfrm_lifetime_cur *ltime;
490 ltime = nla_data(lt);
491 x->curlft.bytes = ltime->bytes;
492 x->curlft.packets = ltime->packets;
493 x->curlft.add_time = ltime->add_time;
494 x->curlft.use_time = ltime->use_time;
495 }
496
497 if (et)
498 x->replay_maxage = nla_get_u32(et);
499
500 if (rt)
501 x->replay_maxdiff = nla_get_u32(rt);
502}
503
504static struct xfrm_state *xfrm_state_construct(struct net *net,
505 struct xfrm_usersa_info *p,
506 struct nlattr **attrs,
507 int *errp)
508{
509 struct xfrm_state *x = xfrm_state_alloc(net);
510 int err = -ENOMEM;
511
512 if (!x)
513 goto error_no_put;
514
515 copy_from_user_state(x, p);
516
517 if (attrs[XFRMA_SA_EXTRA_FLAGS])
518 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
519
520 if ((err = attach_aead(&x->aead, &x->props.ealgo,
521 attrs[XFRMA_ALG_AEAD])))
522 goto error;
523 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
524 attrs[XFRMA_ALG_AUTH_TRUNC])))
525 goto error;
526 if (!x->props.aalgo) {
527 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
528 attrs[XFRMA_ALG_AUTH])))
529 goto error;
530 }
531 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
532 xfrm_ealg_get_byname,
533 attrs[XFRMA_ALG_CRYPT])))
534 goto error;
535 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
536 xfrm_calg_get_byname,
537 attrs[XFRMA_ALG_COMP])))
538 goto error;
539
540 if (attrs[XFRMA_ENCAP]) {
541 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
542 sizeof(*x->encap), GFP_KERNEL);
543 if (x->encap == NULL)
544 goto error;
545 }
546
547 if (attrs[XFRMA_TFCPAD])
548 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
549
550 if (attrs[XFRMA_COADDR]) {
551 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
552 sizeof(*x->coaddr), GFP_KERNEL);
553 if (x->coaddr == NULL)
554 goto error;
555 }
556
557 xfrm_mark_get(attrs, &x->mark);
558
559 err = __xfrm_init_state(x, false);
560 if (err)
561 goto error;
562
563 if (attrs[XFRMA_SEC_CTX] &&
564 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
565 goto error;
566
567 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
568 attrs[XFRMA_REPLAY_ESN_VAL])))
569 goto error;
570
571 x->km.seq = p->seq;
572 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
573 /* sysctl_xfrm_aevent_etime is in 100ms units */
574 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
575
576 if ((err = xfrm_init_replay(x)))
577 goto error;
578
579 /* override default values from above */
580 xfrm_update_ae_params(x, attrs, 0);
581
582 return x;
583
584error:
585 x->km.state = XFRM_STATE_DEAD;
586 xfrm_state_put(x);
587error_no_put:
588 *errp = err;
589 return NULL;
590}
591
592static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
593 struct nlattr **attrs)
594{
595 struct net *net = sock_net(skb->sk);
596 struct xfrm_usersa_info *p = nlmsg_data(nlh);
597 struct xfrm_state *x;
598 int err;
599 struct km_event c;
600 kuid_t loginuid = audit_get_loginuid(current);
601 unsigned int sessionid = audit_get_sessionid(current);
602 u32 sid;
603
604 err = verify_newsa_info(p, attrs);
605 if (err)
606 return err;
607
608 x = xfrm_state_construct(net, p, attrs, &err);
609 if (!x)
610 return err;
611
612 xfrm_state_hold(x);
613 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
614 err = xfrm_state_add(x);
615 else
616 err = xfrm_state_update(x);
617
618 security_task_getsecid(current, &sid);
619 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
620
621 if (err < 0) {
622 x->km.state = XFRM_STATE_DEAD;
623 __xfrm_state_put(x);
624 goto out;
625 }
626
627 c.seq = nlh->nlmsg_seq;
628 c.portid = nlh->nlmsg_pid;
629 c.event = nlh->nlmsg_type;
630
631 km_state_notify(x, &c);
632out:
633 xfrm_state_put(x);
634 return err;
635}
636
637static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
638 struct xfrm_usersa_id *p,
639 struct nlattr **attrs,
640 int *errp)
641{
642 struct xfrm_state *x = NULL;
643 struct xfrm_mark m;
644 int err;
645 u32 mark = xfrm_mark_get(attrs, &m);
646
647 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
648 err = -ESRCH;
649 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
650 } else {
651 xfrm_address_t *saddr = NULL;
652
653 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
654 if (!saddr) {
655 err = -EINVAL;
656 goto out;
657 }
658
659 err = -ESRCH;
660 x = xfrm_state_lookup_byaddr(net, mark,
661 &p->daddr, saddr,
662 p->proto, p->family);
663 }
664
665 out:
666 if (!x && errp)
667 *errp = err;
668 return x;
669}
670
671static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
672 struct nlattr **attrs)
673{
674 struct net *net = sock_net(skb->sk);
675 struct xfrm_state *x;
676 int err = -ESRCH;
677 struct km_event c;
678 struct xfrm_usersa_id *p = nlmsg_data(nlh);
679 kuid_t loginuid = audit_get_loginuid(current);
680 unsigned int sessionid = audit_get_sessionid(current);
681 u32 sid;
682
683 x = xfrm_user_state_lookup(net, p, attrs, &err);
684 if (x == NULL)
685 return err;
686
687 if ((err = security_xfrm_state_delete(x)) != 0)
688 goto out;
689
690 if (xfrm_state_kern(x)) {
691 err = -EPERM;
692 goto out;
693 }
694
695 err = xfrm_state_delete(x);
696
697 if (err < 0)
698 goto out;
699
700 c.seq = nlh->nlmsg_seq;
701 c.portid = nlh->nlmsg_pid;
702 c.event = nlh->nlmsg_type;
703 km_state_notify(x, &c);
704
705out:
706 security_task_getsecid(current, &sid);
707 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
708 xfrm_state_put(x);
709 return err;
710}
711
712static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
713{
714 memset(p, 0, sizeof(*p));
715 memcpy(&p->id, &x->id, sizeof(p->id));
716 memcpy(&p->sel, &x->sel, sizeof(p->sel));
717 memcpy(&p->lft, &x->lft, sizeof(p->lft));
718 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
719 memcpy(&p->stats, &x->stats, sizeof(p->stats));
720 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
721 p->mode = x->props.mode;
722 p->replay_window = x->props.replay_window;
723 p->reqid = x->props.reqid;
724 p->family = x->props.family;
725 p->flags = x->props.flags;
726 p->seq = x->km.seq;
727}
728
729struct xfrm_dump_info {
730 struct sk_buff *in_skb;
731 struct sk_buff *out_skb;
732 u32 nlmsg_seq;
733 u16 nlmsg_flags;
734};
735
736static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
737{
738 struct xfrm_user_sec_ctx *uctx;
739 struct nlattr *attr;
740 int ctx_size = sizeof(*uctx) + s->ctx_len;
741
742 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
743 if (attr == NULL)
744 return -EMSGSIZE;
745
746 uctx = nla_data(attr);
747 uctx->exttype = XFRMA_SEC_CTX;
748 uctx->len = ctx_size;
749 uctx->ctx_doi = s->ctx_doi;
750 uctx->ctx_alg = s->ctx_alg;
751 uctx->ctx_len = s->ctx_len;
752 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
753
754 return 0;
755}
756
757static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
758{
759 struct xfrm_algo *algo;
760 struct nlattr *nla;
761
762 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
763 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
764 if (!nla)
765 return -EMSGSIZE;
766
767 algo = nla_data(nla);
768 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
769 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
770 algo->alg_key_len = auth->alg_key_len;
771
772 return 0;
773}
774
775/* Don't change this without updating xfrm_sa_len! */
776static int copy_to_user_state_extra(struct xfrm_state *x,
777 struct xfrm_usersa_info *p,
778 struct sk_buff *skb)
779{
780 int ret = 0;
781
782 copy_to_user_state(x, p);
783
784 if (x->props.extra_flags) {
785 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
786 x->props.extra_flags);
787 if (ret)
788 goto out;
789 }
790
791 if (x->coaddr) {
792 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
793 if (ret)
794 goto out;
795 }
796 if (x->lastused) {
797 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
798 if (ret)
799 goto out;
800 }
801 if (x->aead) {
802 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
803 if (ret)
804 goto out;
805 }
806 if (x->aalg) {
807 ret = copy_to_user_auth(x->aalg, skb);
808 if (!ret)
809 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
810 xfrm_alg_auth_len(x->aalg), x->aalg);
811 if (ret)
812 goto out;
813 }
814 if (x->ealg) {
815 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
816 if (ret)
817 goto out;
818 }
819 if (x->calg) {
820 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
821 if (ret)
822 goto out;
823 }
824 if (x->encap) {
825 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
826 if (ret)
827 goto out;
828 }
829 if (x->tfcpad) {
830 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
831 if (ret)
832 goto out;
833 }
834 ret = xfrm_mark_put(skb, &x->mark);
835 if (ret)
836 goto out;
837 if (x->replay_esn) {
838 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
839 xfrm_replay_state_esn_len(x->replay_esn),
840 x->replay_esn);
841 if (ret)
842 goto out;
843 }
844 if (x->security)
845 ret = copy_sec_ctx(x->security, skb);
846out:
847 return ret;
848}
849
850static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
851{
852 struct xfrm_dump_info *sp = ptr;
853 struct sk_buff *in_skb = sp->in_skb;
854 struct sk_buff *skb = sp->out_skb;
855 struct xfrm_usersa_info *p;
856 struct nlmsghdr *nlh;
857 int err;
858
859 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
860 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
861 if (nlh == NULL)
862 return -EMSGSIZE;
863
864 p = nlmsg_data(nlh);
865
866 err = copy_to_user_state_extra(x, p, skb);
867 if (err) {
868 nlmsg_cancel(skb, nlh);
869 return err;
870 }
871 nlmsg_end(skb, nlh);
872 return 0;
873}
874
875static int xfrm_dump_sa_done(struct netlink_callback *cb)
876{
877 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
878 struct sock *sk = cb->skb->sk;
879 struct net *net = sock_net(sk);
880
881 xfrm_state_walk_done(walk, net);
882 return 0;
883}
884
885static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
886static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
887{
888 struct net *net = sock_net(skb->sk);
889 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
890 struct xfrm_dump_info info;
891
892 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
893 sizeof(cb->args) - sizeof(cb->args[0]));
894
895 info.in_skb = cb->skb;
896 info.out_skb = skb;
897 info.nlmsg_seq = cb->nlh->nlmsg_seq;
898 info.nlmsg_flags = NLM_F_MULTI;
899
900 if (!cb->args[0]) {
901 struct nlattr *attrs[XFRMA_MAX+1];
902 struct xfrm_address_filter *filter = NULL;
903 u8 proto = 0;
904 int err;
905
906 cb->args[0] = 1;
907
908 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
909 xfrma_policy);
910 if (err < 0)
911 return err;
912
913 if (attrs[XFRMA_ADDRESS_FILTER]) {
914 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
915 if (filter == NULL)
916 return -ENOMEM;
917
918 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
919 sizeof(*filter));
920 }
921
922 if (attrs[XFRMA_PROTO])
923 proto = nla_get_u8(attrs[XFRMA_PROTO]);
924
925 xfrm_state_walk_init(walk, proto, filter);
926 }
927
928 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
929
930 return skb->len;
931}
932
933static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
934 struct xfrm_state *x, u32 seq)
935{
936 struct xfrm_dump_info info;
937 struct sk_buff *skb;
938 int err;
939
940 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
941 if (!skb)
942 return ERR_PTR(-ENOMEM);
943
944 info.in_skb = in_skb;
945 info.out_skb = skb;
946 info.nlmsg_seq = seq;
947 info.nlmsg_flags = 0;
948
949 err = dump_one_state(x, 0, &info);
950 if (err) {
951 kfree_skb(skb);
952 return ERR_PTR(err);
953 }
954
955 return skb;
956}
957
958static inline size_t xfrm_spdinfo_msgsize(void)
959{
960 return NLMSG_ALIGN(4)
961 + nla_total_size(sizeof(struct xfrmu_spdinfo))
962 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
963}
964
965static int build_spdinfo(struct sk_buff *skb, struct net *net,
966 u32 portid, u32 seq, u32 flags)
967{
968 struct xfrmk_spdinfo si;
969 struct xfrmu_spdinfo spc;
970 struct xfrmu_spdhinfo sph;
971 struct nlmsghdr *nlh;
972 int err;
973 u32 *f;
974
975 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
976 if (nlh == NULL) /* shouldn't really happen ... */
977 return -EMSGSIZE;
978
979 f = nlmsg_data(nlh);
980 *f = flags;
981 xfrm_spd_getinfo(net, &si);
982 spc.incnt = si.incnt;
983 spc.outcnt = si.outcnt;
984 spc.fwdcnt = si.fwdcnt;
985 spc.inscnt = si.inscnt;
986 spc.outscnt = si.outscnt;
987 spc.fwdscnt = si.fwdscnt;
988 sph.spdhcnt = si.spdhcnt;
989 sph.spdhmcnt = si.spdhmcnt;
990
991 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
992 if (!err)
993 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
994 if (err) {
995 nlmsg_cancel(skb, nlh);
996 return err;
997 }
998
999 return nlmsg_end(skb, nlh);
1000}
1001
1002static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1003 struct nlattr **attrs)
1004{
1005 struct net *net = sock_net(skb->sk);
1006 struct sk_buff *r_skb;
1007 u32 *flags = nlmsg_data(nlh);
1008 u32 sportid = NETLINK_CB(skb).portid;
1009 u32 seq = nlh->nlmsg_seq;
1010
1011 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1012 if (r_skb == NULL)
1013 return -ENOMEM;
1014
1015 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1016 BUG();
1017
1018 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1019}
1020
1021static inline size_t xfrm_sadinfo_msgsize(void)
1022{
1023 return NLMSG_ALIGN(4)
1024 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1025 + nla_total_size(4); /* XFRMA_SAD_CNT */
1026}
1027
1028static int build_sadinfo(struct sk_buff *skb, struct net *net,
1029 u32 portid, u32 seq, u32 flags)
1030{
1031 struct xfrmk_sadinfo si;
1032 struct xfrmu_sadhinfo sh;
1033 struct nlmsghdr *nlh;
1034 int err;
1035 u32 *f;
1036
1037 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1038 if (nlh == NULL) /* shouldn't really happen ... */
1039 return -EMSGSIZE;
1040
1041 f = nlmsg_data(nlh);
1042 *f = flags;
1043 xfrm_sad_getinfo(net, &si);
1044
1045 sh.sadhmcnt = si.sadhmcnt;
1046 sh.sadhcnt = si.sadhcnt;
1047
1048 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1049 if (!err)
1050 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1051 if (err) {
1052 nlmsg_cancel(skb, nlh);
1053 return err;
1054 }
1055
1056 return nlmsg_end(skb, nlh);
1057}
1058
1059static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1060 struct nlattr **attrs)
1061{
1062 struct net *net = sock_net(skb->sk);
1063 struct sk_buff *r_skb;
1064 u32 *flags = nlmsg_data(nlh);
1065 u32 sportid = NETLINK_CB(skb).portid;
1066 u32 seq = nlh->nlmsg_seq;
1067
1068 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1069 if (r_skb == NULL)
1070 return -ENOMEM;
1071
1072 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1073 BUG();
1074
1075 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1076}
1077
1078static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1079 struct nlattr **attrs)
1080{
1081 struct net *net = sock_net(skb->sk);
1082 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1083 struct xfrm_state *x;
1084 struct sk_buff *resp_skb;
1085 int err = -ESRCH;
1086
1087 x = xfrm_user_state_lookup(net, p, attrs, &err);
1088 if (x == NULL)
1089 goto out_noput;
1090
1091 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1092 if (IS_ERR(resp_skb)) {
1093 err = PTR_ERR(resp_skb);
1094 } else {
1095 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1096 }
1097 xfrm_state_put(x);
1098out_noput:
1099 return err;
1100}
1101
1102static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1103 struct nlattr **attrs)
1104{
1105 struct net *net = sock_net(skb->sk);
1106 struct xfrm_state *x;
1107 struct xfrm_userspi_info *p;
1108 struct sk_buff *resp_skb;
1109 xfrm_address_t *daddr;
1110 int family;
1111 int err;
1112 u32 mark;
1113 struct xfrm_mark m;
1114
1115 p = nlmsg_data(nlh);
1116 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1117 if (err)
1118 goto out_noput;
1119
1120 family = p->info.family;
1121 daddr = &p->info.id.daddr;
1122
1123 x = NULL;
1124
1125 mark = xfrm_mark_get(attrs, &m);
1126 if (p->info.seq) {
1127 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1128 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1129 xfrm_state_put(x);
1130 x = NULL;
1131 }
1132 }
1133
1134 if (!x)
1135 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1136 p->info.id.proto, daddr,
1137 &p->info.saddr, 1,
1138 family);
1139 err = -ENOENT;
1140 if (x == NULL)
1141 goto out_noput;
1142
1143 err = xfrm_alloc_spi(x, p->min, p->max);
1144 if (err)
1145 goto out;
1146
1147 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1148 if (IS_ERR(resp_skb)) {
1149 err = PTR_ERR(resp_skb);
1150 goto out;
1151 }
1152
1153 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1154
1155out:
1156 xfrm_state_put(x);
1157out_noput:
1158 return err;
1159}
1160
1161static int verify_policy_dir(u8 dir)
1162{
1163 switch (dir) {
1164 case XFRM_POLICY_IN:
1165 case XFRM_POLICY_OUT:
1166 case XFRM_POLICY_FWD:
1167 break;
1168
1169 default:
1170 return -EINVAL;
1171 }
1172
1173 return 0;
1174}
1175
1176static int verify_policy_type(u8 type)
1177{
1178 switch (type) {
1179 case XFRM_POLICY_TYPE_MAIN:
1180#ifdef CONFIG_XFRM_SUB_POLICY
1181 case XFRM_POLICY_TYPE_SUB:
1182#endif
1183 break;
1184
1185 default:
1186 return -EINVAL;
1187 }
1188
1189 return 0;
1190}
1191
1192static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1193{
1194 int ret;
1195
1196 switch (p->share) {
1197 case XFRM_SHARE_ANY:
1198 case XFRM_SHARE_SESSION:
1199 case XFRM_SHARE_USER:
1200 case XFRM_SHARE_UNIQUE:
1201 break;
1202
1203 default:
1204 return -EINVAL;
1205 }
1206
1207 switch (p->action) {
1208 case XFRM_POLICY_ALLOW:
1209 case XFRM_POLICY_BLOCK:
1210 break;
1211
1212 default:
1213 return -EINVAL;
1214 }
1215
1216 switch (p->sel.family) {
1217 case AF_INET:
1218 break;
1219
1220 case AF_INET6:
1221#if IS_ENABLED(CONFIG_IPV6)
1222 break;
1223#else
1224 return -EAFNOSUPPORT;
1225#endif
1226
1227 default:
1228 return -EINVAL;
1229 }
1230
1231 ret = verify_policy_dir(p->dir);
1232 if (ret)
1233 return ret;
1234 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1235 return -EINVAL;
1236
1237 return 0;
1238}
1239
1240static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1241{
1242 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1243 struct xfrm_user_sec_ctx *uctx;
1244
1245 if (!rt)
1246 return 0;
1247
1248 uctx = nla_data(rt);
1249 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1250}
1251
1252static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1253 int nr)
1254{
1255 int i;
1256
1257 xp->xfrm_nr = nr;
1258 for (i = 0; i < nr; i++, ut++) {
1259 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1260
1261 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1262 memcpy(&t->saddr, &ut->saddr,
1263 sizeof(xfrm_address_t));
1264 t->reqid = ut->reqid;
1265 t->mode = ut->mode;
1266 t->share = ut->share;
1267 t->optional = ut->optional;
1268 t->aalgos = ut->aalgos;
1269 t->ealgos = ut->ealgos;
1270 t->calgos = ut->calgos;
1271 /* If all masks are ~0, then we allow all algorithms. */
1272 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1273 t->encap_family = ut->family;
1274 }
1275}
1276
1277static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1278{
1279 int i;
1280
1281 if (nr > XFRM_MAX_DEPTH)
1282 return -EINVAL;
1283
1284 for (i = 0; i < nr; i++) {
1285 /* We never validated the ut->family value, so many
1286 * applications simply leave it at zero. The check was
1287 * never made and ut->family was ignored because all
1288 * templates could be assumed to have the same family as
1289 * the policy itself. Now that we will have ipv4-in-ipv6
1290 * and ipv6-in-ipv4 tunnels, this is no longer true.
1291 */
1292 if (!ut[i].family)
1293 ut[i].family = family;
1294
1295 switch (ut[i].family) {
1296 case AF_INET:
1297 break;
1298#if IS_ENABLED(CONFIG_IPV6)
1299 case AF_INET6:
1300 break;
1301#endif
1302 default:
1303 return -EINVAL;
1304 }
1305 }
1306
1307 return 0;
1308}
1309
1310static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1311{
1312 struct nlattr *rt = attrs[XFRMA_TMPL];
1313
1314 if (!rt) {
1315 pol->xfrm_nr = 0;
1316 } else {
1317 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1318 int nr = nla_len(rt) / sizeof(*utmpl);
1319 int err;
1320
1321 err = validate_tmpl(nr, utmpl, pol->family);
1322 if (err)
1323 return err;
1324
1325 copy_templates(pol, utmpl, nr);
1326 }
1327 return 0;
1328}
1329
1330static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1331{
1332 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1333 struct xfrm_userpolicy_type *upt;
1334 u8 type = XFRM_POLICY_TYPE_MAIN;
1335 int err;
1336
1337 if (rt) {
1338 upt = nla_data(rt);
1339 type = upt->type;
1340 }
1341
1342 err = verify_policy_type(type);
1343 if (err)
1344 return err;
1345
1346 *tp = type;
1347 return 0;
1348}
1349
1350static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1351{
1352 xp->priority = p->priority;
1353 xp->index = p->index;
1354 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1355 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1356 xp->action = p->action;
1357 xp->flags = p->flags;
1358 xp->family = p->sel.family;
1359 /* XXX xp->share = p->share; */
1360}
1361
1362static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1363{
1364 memset(p, 0, sizeof(*p));
1365 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1366 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1367 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1368 p->priority = xp->priority;
1369 p->index = xp->index;
1370 p->sel.family = xp->family;
1371 p->dir = dir;
1372 p->action = xp->action;
1373 p->flags = xp->flags;
1374 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1375}
1376
1377static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1378{
1379 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1380 int err;
1381
1382 if (!xp) {
1383 *errp = -ENOMEM;
1384 return NULL;
1385 }
1386
1387 copy_from_user_policy(xp, p);
1388
1389 err = copy_from_user_policy_type(&xp->type, attrs);
1390 if (err)
1391 goto error;
1392
1393 if (!(err = copy_from_user_tmpl(xp, attrs)))
1394 err = copy_from_user_sec_ctx(xp, attrs);
1395 if (err)
1396 goto error;
1397
1398 xfrm_mark_get(attrs, &xp->mark);
1399
1400 return xp;
1401 error:
1402 *errp = err;
1403 xp->walk.dead = 1;
1404 xfrm_policy_destroy(xp);
1405 return NULL;
1406}
1407
1408static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1409 struct nlattr **attrs)
1410{
1411 struct net *net = sock_net(skb->sk);
1412 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1413 struct xfrm_policy *xp;
1414 struct km_event c;
1415 int err;
1416 int excl;
1417 kuid_t loginuid = audit_get_loginuid(current);
1418 unsigned int sessionid = audit_get_sessionid(current);
1419 u32 sid;
1420
1421 err = verify_newpolicy_info(p);
1422 if (err)
1423 return err;
1424 err = verify_sec_ctx_len(attrs);
1425 if (err)
1426 return err;
1427
1428 xp = xfrm_policy_construct(net, p, attrs, &err);
1429 if (!xp)
1430 return err;
1431
1432 /* shouldn't excl be based on nlh flags??
1433 * Aha! this is anti-netlink really i.e more pfkey derived
1434 * in netlink excl is a flag and you wouldnt need
1435 * a type XFRM_MSG_UPDPOLICY - JHS */
1436 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1437 err = xfrm_policy_insert(p->dir, xp, excl);
1438 security_task_getsecid(current, &sid);
1439 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1440
1441 if (err) {
1442 security_xfrm_policy_free(xp->security);
1443 kfree(xp);
1444 return err;
1445 }
1446
1447 c.event = nlh->nlmsg_type;
1448 c.seq = nlh->nlmsg_seq;
1449 c.portid = nlh->nlmsg_pid;
1450 km_policy_notify(xp, p->dir, &c);
1451
1452 xfrm_pol_put(xp);
1453
1454 return 0;
1455}
1456
1457static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1458{
1459 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1460 int i;
1461
1462 if (xp->xfrm_nr == 0)
1463 return 0;
1464
1465 for (i = 0; i < xp->xfrm_nr; i++) {
1466 struct xfrm_user_tmpl *up = &vec[i];
1467 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1468
1469 memset(up, 0, sizeof(*up));
1470 memcpy(&up->id, &kp->id, sizeof(up->id));
1471 up->family = kp->encap_family;
1472 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1473 up->reqid = kp->reqid;
1474 up->mode = kp->mode;
1475 up->share = kp->share;
1476 up->optional = kp->optional;
1477 up->aalgos = kp->aalgos;
1478 up->ealgos = kp->ealgos;
1479 up->calgos = kp->calgos;
1480 }
1481
1482 return nla_put(skb, XFRMA_TMPL,
1483 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1484}
1485
1486static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1487{
1488 if (x->security) {
1489 return copy_sec_ctx(x->security, skb);
1490 }
1491 return 0;
1492}
1493
1494static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1495{
1496 if (xp->security)
1497 return copy_sec_ctx(xp->security, skb);
1498 return 0;
1499}
1500static inline size_t userpolicy_type_attrsize(void)
1501{
1502#ifdef CONFIG_XFRM_SUB_POLICY
1503 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1504#else
1505 return 0;
1506#endif
1507}
1508
1509#ifdef CONFIG_XFRM_SUB_POLICY
1510static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1511{
1512 struct xfrm_userpolicy_type upt = {
1513 .type = type,
1514 };
1515
1516 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1517}
1518
1519#else
1520static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1521{
1522 return 0;
1523}
1524#endif
1525
1526static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1527{
1528 struct xfrm_dump_info *sp = ptr;
1529 struct xfrm_userpolicy_info *p;
1530 struct sk_buff *in_skb = sp->in_skb;
1531 struct sk_buff *skb = sp->out_skb;
1532 struct nlmsghdr *nlh;
1533 int err;
1534
1535 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1536 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1537 if (nlh == NULL)
1538 return -EMSGSIZE;
1539
1540 p = nlmsg_data(nlh);
1541 copy_to_user_policy(xp, p, dir);
1542 err = copy_to_user_tmpl(xp, skb);
1543 if (!err)
1544 err = copy_to_user_sec_ctx(xp, skb);
1545 if (!err)
1546 err = copy_to_user_policy_type(xp->type, skb);
1547 if (!err)
1548 err = xfrm_mark_put(skb, &xp->mark);
1549 if (err) {
1550 nlmsg_cancel(skb, nlh);
1551 return err;
1552 }
1553 nlmsg_end(skb, nlh);
1554 return 0;
1555}
1556
1557static int xfrm_dump_policy_done(struct netlink_callback *cb)
1558{
1559 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1560 struct net *net = sock_net(cb->skb->sk);
1561
1562 xfrm_policy_walk_done(walk, net);
1563 return 0;
1564}
1565
1566static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1567{
1568 struct net *net = sock_net(skb->sk);
1569 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1570 struct xfrm_dump_info info;
1571
1572 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1573 sizeof(cb->args) - sizeof(cb->args[0]));
1574
1575 info.in_skb = cb->skb;
1576 info.out_skb = skb;
1577 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1578 info.nlmsg_flags = NLM_F_MULTI;
1579
1580 if (!cb->args[0]) {
1581 cb->args[0] = 1;
1582 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1583 }
1584
1585 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1586
1587 return skb->len;
1588}
1589
1590static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1591 struct xfrm_policy *xp,
1592 int dir, u32 seq)
1593{
1594 struct xfrm_dump_info info;
1595 struct sk_buff *skb;
1596 int err;
1597
1598 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1599 if (!skb)
1600 return ERR_PTR(-ENOMEM);
1601
1602 info.in_skb = in_skb;
1603 info.out_skb = skb;
1604 info.nlmsg_seq = seq;
1605 info.nlmsg_flags = 0;
1606
1607 err = dump_one_policy(xp, dir, 0, &info);
1608 if (err) {
1609 kfree_skb(skb);
1610 return ERR_PTR(err);
1611 }
1612
1613 return skb;
1614}
1615
1616static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1617 struct nlattr **attrs)
1618{
1619 struct net *net = sock_net(skb->sk);
1620 struct xfrm_policy *xp;
1621 struct xfrm_userpolicy_id *p;
1622 u8 type = XFRM_POLICY_TYPE_MAIN;
1623 int err;
1624 struct km_event c;
1625 int delete;
1626 struct xfrm_mark m;
1627 u32 mark = xfrm_mark_get(attrs, &m);
1628
1629 p = nlmsg_data(nlh);
1630 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1631
1632 err = copy_from_user_policy_type(&type, attrs);
1633 if (err)
1634 return err;
1635
1636 err = verify_policy_dir(p->dir);
1637 if (err)
1638 return err;
1639
1640 if (p->index)
1641 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1642 else {
1643 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1644 struct xfrm_sec_ctx *ctx;
1645
1646 err = verify_sec_ctx_len(attrs);
1647 if (err)
1648 return err;
1649
1650 ctx = NULL;
1651 if (rt) {
1652 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1653
1654 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1655 if (err)
1656 return err;
1657 }
1658 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1659 ctx, delete, &err);
1660 security_xfrm_policy_free(ctx);
1661 }
1662 if (xp == NULL)
1663 return -ENOENT;
1664
1665 if (!delete) {
1666 struct sk_buff *resp_skb;
1667
1668 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1669 if (IS_ERR(resp_skb)) {
1670 err = PTR_ERR(resp_skb);
1671 } else {
1672 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1673 NETLINK_CB(skb).portid);
1674 }
1675 } else {
1676 kuid_t loginuid = audit_get_loginuid(current);
1677 unsigned int sessionid = audit_get_sessionid(current);
1678 u32 sid;
1679
1680 security_task_getsecid(current, &sid);
1681 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1682 sid);
1683
1684 if (err != 0)
1685 goto out;
1686
1687 c.data.byid = p->index;
1688 c.event = nlh->nlmsg_type;
1689 c.seq = nlh->nlmsg_seq;
1690 c.portid = nlh->nlmsg_pid;
1691 km_policy_notify(xp, p->dir, &c);
1692 }
1693
1694out:
1695 xfrm_pol_put(xp);
1696 if (delete && err == 0)
1697 xfrm_garbage_collect(net);
1698 return err;
1699}
1700
1701static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1702 struct nlattr **attrs)
1703{
1704 struct net *net = sock_net(skb->sk);
1705 struct km_event c;
1706 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1707 struct xfrm_audit audit_info;
1708 int err;
1709
1710 audit_info.loginuid = audit_get_loginuid(current);
1711 audit_info.sessionid = audit_get_sessionid(current);
1712 security_task_getsecid(current, &audit_info.secid);
1713 err = xfrm_state_flush(net, p->proto, &audit_info);
1714 if (err) {
1715 if (err == -ESRCH) /* empty table */
1716 return 0;
1717 return err;
1718 }
1719 c.data.proto = p->proto;
1720 c.event = nlh->nlmsg_type;
1721 c.seq = nlh->nlmsg_seq;
1722 c.portid = nlh->nlmsg_pid;
1723 c.net = net;
1724 km_state_notify(NULL, &c);
1725
1726 return 0;
1727}
1728
1729static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1730{
1731 size_t replay_size = x->replay_esn ?
1732 xfrm_replay_state_esn_len(x->replay_esn) :
1733 sizeof(struct xfrm_replay_state);
1734
1735 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1736 + nla_total_size(replay_size)
1737 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1738 + nla_total_size(sizeof(struct xfrm_mark))
1739 + nla_total_size(4) /* XFRM_AE_RTHR */
1740 + nla_total_size(4); /* XFRM_AE_ETHR */
1741}
1742
1743static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1744{
1745 struct xfrm_aevent_id *id;
1746 struct nlmsghdr *nlh;
1747 int err;
1748
1749 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1750 if (nlh == NULL)
1751 return -EMSGSIZE;
1752
1753 id = nlmsg_data(nlh);
1754 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1755 id->sa_id.spi = x->id.spi;
1756 id->sa_id.family = x->props.family;
1757 id->sa_id.proto = x->id.proto;
1758 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1759 id->reqid = x->props.reqid;
1760 id->flags = c->data.aevent;
1761
1762 if (x->replay_esn) {
1763 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1764 xfrm_replay_state_esn_len(x->replay_esn),
1765 x->replay_esn);
1766 } else {
1767 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1768 &x->replay);
1769 }
1770 if (err)
1771 goto out_cancel;
1772 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1773 if (err)
1774 goto out_cancel;
1775
1776 if (id->flags & XFRM_AE_RTHR) {
1777 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1778 if (err)
1779 goto out_cancel;
1780 }
1781 if (id->flags & XFRM_AE_ETHR) {
1782 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1783 x->replay_maxage * 10 / HZ);
1784 if (err)
1785 goto out_cancel;
1786 }
1787 err = xfrm_mark_put(skb, &x->mark);
1788 if (err)
1789 goto out_cancel;
1790
1791 return nlmsg_end(skb, nlh);
1792
1793out_cancel:
1794 nlmsg_cancel(skb, nlh);
1795 return err;
1796}
1797
1798static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1799 struct nlattr **attrs)
1800{
1801 struct net *net = sock_net(skb->sk);
1802 struct xfrm_state *x;
1803 struct sk_buff *r_skb;
1804 int err;
1805 struct km_event c;
1806 u32 mark;
1807 struct xfrm_mark m;
1808 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1809 struct xfrm_usersa_id *id = &p->sa_id;
1810
1811 mark = xfrm_mark_get(attrs, &m);
1812
1813 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1814 if (x == NULL)
1815 return -ESRCH;
1816
1817 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1818 if (r_skb == NULL) {
1819 xfrm_state_put(x);
1820 return -ENOMEM;
1821 }
1822
1823 /*
1824 * XXX: is this lock really needed - none of the other
1825 * gets lock (the concern is things getting updated
1826 * while we are still reading) - jhs
1827 */
1828 spin_lock_bh(&x->lock);
1829 c.data.aevent = p->flags;
1830 c.seq = nlh->nlmsg_seq;
1831 c.portid = nlh->nlmsg_pid;
1832
1833 if (build_aevent(r_skb, x, &c) < 0)
1834 BUG();
1835 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1836 spin_unlock_bh(&x->lock);
1837 xfrm_state_put(x);
1838 return err;
1839}
1840
1841static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1842 struct nlattr **attrs)
1843{
1844 struct net *net = sock_net(skb->sk);
1845 struct xfrm_state *x;
1846 struct km_event c;
1847 int err = -EINVAL;
1848 u32 mark = 0;
1849 struct xfrm_mark m;
1850 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1851 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1852 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1853 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1854
1855 if (!lt && !rp && !re)
1856 return err;
1857
1858 /* pedantic mode - thou shalt sayeth replaceth */
1859 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1860 return err;
1861
1862 mark = xfrm_mark_get(attrs, &m);
1863
1864 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1865 if (x == NULL)
1866 return -ESRCH;
1867
1868 if (x->km.state != XFRM_STATE_VALID)
1869 goto out;
1870
1871 err = xfrm_replay_verify_len(x->replay_esn, re);
1872 if (err)
1873 goto out;
1874
1875 spin_lock_bh(&x->lock);
1876 xfrm_update_ae_params(x, attrs, 1);
1877 spin_unlock_bh(&x->lock);
1878
1879 c.event = nlh->nlmsg_type;
1880 c.seq = nlh->nlmsg_seq;
1881 c.portid = nlh->nlmsg_pid;
1882 c.data.aevent = XFRM_AE_CU;
1883 km_state_notify(x, &c);
1884 err = 0;
1885out:
1886 xfrm_state_put(x);
1887 return err;
1888}
1889
1890static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1891 struct nlattr **attrs)
1892{
1893 struct net *net = sock_net(skb->sk);
1894 struct km_event c;
1895 u8 type = XFRM_POLICY_TYPE_MAIN;
1896 int err;
1897 struct xfrm_audit audit_info;
1898
1899 err = copy_from_user_policy_type(&type, attrs);
1900 if (err)
1901 return err;
1902
1903 audit_info.loginuid = audit_get_loginuid(current);
1904 audit_info.sessionid = audit_get_sessionid(current);
1905 security_task_getsecid(current, &audit_info.secid);
1906 err = xfrm_policy_flush(net, type, &audit_info);
1907 if (err) {
1908 if (err == -ESRCH) /* empty table */
1909 return 0;
1910 return err;
1911 }
1912
1913 c.data.type = type;
1914 c.event = nlh->nlmsg_type;
1915 c.seq = nlh->nlmsg_seq;
1916 c.portid = nlh->nlmsg_pid;
1917 c.net = net;
1918 km_policy_notify(NULL, 0, &c);
1919 return 0;
1920}
1921
1922static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1923 struct nlattr **attrs)
1924{
1925 struct net *net = sock_net(skb->sk);
1926 struct xfrm_policy *xp;
1927 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1928 struct xfrm_userpolicy_info *p = &up->pol;
1929 u8 type = XFRM_POLICY_TYPE_MAIN;
1930 int err = -ENOENT;
1931 struct xfrm_mark m;
1932 u32 mark = xfrm_mark_get(attrs, &m);
1933
1934 err = copy_from_user_policy_type(&type, attrs);
1935 if (err)
1936 return err;
1937
1938 err = verify_policy_dir(p->dir);
1939 if (err)
1940 return err;
1941
1942 if (p->index)
1943 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1944 else {
1945 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1946 struct xfrm_sec_ctx *ctx;
1947
1948 err = verify_sec_ctx_len(attrs);
1949 if (err)
1950 return err;
1951
1952 ctx = NULL;
1953 if (rt) {
1954 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1955
1956 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1957 if (err)
1958 return err;
1959 }
1960 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1961 &p->sel, ctx, 0, &err);
1962 security_xfrm_policy_free(ctx);
1963 }
1964 if (xp == NULL)
1965 return -ENOENT;
1966
1967 if (unlikely(xp->walk.dead))
1968 goto out;
1969
1970 err = 0;
1971 if (up->hard) {
1972 kuid_t loginuid = audit_get_loginuid(current);
1973 unsigned int sessionid = audit_get_sessionid(current);
1974 u32 sid;
1975
1976 security_task_getsecid(current, &sid);
1977 xfrm_policy_delete(xp, p->dir);
1978 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1979
1980 } else {
1981 // reset the timers here?
1982 WARN(1, "Dont know what to do with soft policy expire\n");
1983 }
1984 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1985
1986out:
1987 xfrm_pol_put(xp);
1988 return err;
1989}
1990
1991static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1992 struct nlattr **attrs)
1993{
1994 struct net *net = sock_net(skb->sk);
1995 struct xfrm_state *x;
1996 int err;
1997 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1998 struct xfrm_usersa_info *p = &ue->state;
1999 struct xfrm_mark m;
2000 u32 mark = xfrm_mark_get(attrs, &m);
2001
2002 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2003
2004 err = -ENOENT;
2005 if (x == NULL)
2006 return err;
2007
2008 spin_lock_bh(&x->lock);
2009 err = -EINVAL;
2010 if (x->km.state != XFRM_STATE_VALID)
2011 goto out;
2012 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2013
2014 if (ue->hard) {
2015 kuid_t loginuid = audit_get_loginuid(current);
2016 unsigned int sessionid = audit_get_sessionid(current);
2017 u32 sid;
2018
2019 security_task_getsecid(current, &sid);
2020 __xfrm_state_delete(x);
2021 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
2022 }
2023 err = 0;
2024out:
2025 spin_unlock_bh(&x->lock);
2026 xfrm_state_put(x);
2027 return err;
2028}
2029
2030static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2031 struct nlattr **attrs)
2032{
2033 struct net *net = sock_net(skb->sk);
2034 struct xfrm_policy *xp;
2035 struct xfrm_user_tmpl *ut;
2036 int i;
2037 struct nlattr *rt = attrs[XFRMA_TMPL];
2038 struct xfrm_mark mark;
2039
2040 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2041 struct xfrm_state *x = xfrm_state_alloc(net);
2042 int err = -ENOMEM;
2043
2044 if (!x)
2045 goto nomem;
2046
2047 xfrm_mark_get(attrs, &mark);
2048
2049 err = verify_newpolicy_info(&ua->policy);
2050 if (err)
2051 goto bad_policy;
2052
2053 /* build an XP */
2054 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2055 if (!xp)
2056 goto free_state;
2057
2058 memcpy(&x->id, &ua->id, sizeof(ua->id));
2059 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2060 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2061 xp->mark.m = x->mark.m = mark.m;
2062 xp->mark.v = x->mark.v = mark.v;
2063 ut = nla_data(rt);
2064 /* extract the templates and for each call km_key */
2065 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2066 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2067 memcpy(&x->id, &t->id, sizeof(x->id));
2068 x->props.mode = t->mode;
2069 x->props.reqid = t->reqid;
2070 x->props.family = ut->family;
2071 t->aalgos = ua->aalgos;
2072 t->ealgos = ua->ealgos;
2073 t->calgos = ua->calgos;
2074 err = km_query(x, t, xp);
2075
2076 }
2077
2078 kfree(x);
2079 kfree(xp);
2080
2081 return 0;
2082
2083bad_policy:
2084 WARN(1, "BAD policy passed\n");
2085free_state:
2086 kfree(x);
2087nomem:
2088 return err;
2089}
2090
2091#ifdef CONFIG_XFRM_MIGRATE
2092static int copy_from_user_migrate(struct xfrm_migrate *ma,
2093 struct xfrm_kmaddress *k,
2094 struct nlattr **attrs, int *num)
2095{
2096 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2097 struct xfrm_user_migrate *um;
2098 int i, num_migrate;
2099
2100 if (k != NULL) {
2101 struct xfrm_user_kmaddress *uk;
2102
2103 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2104 memcpy(&k->local, &uk->local, sizeof(k->local));
2105 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2106 k->family = uk->family;
2107 k->reserved = uk->reserved;
2108 }
2109
2110 um = nla_data(rt);
2111 num_migrate = nla_len(rt) / sizeof(*um);
2112
2113 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2114 return -EINVAL;
2115
2116 for (i = 0; i < num_migrate; i++, um++, ma++) {
2117 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2118 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2119 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2120 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2121
2122 ma->proto = um->proto;
2123 ma->mode = um->mode;
2124 ma->reqid = um->reqid;
2125
2126 ma->old_family = um->old_family;
2127 ma->new_family = um->new_family;
2128 }
2129
2130 *num = i;
2131 return 0;
2132}
2133
2134static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2135 struct nlattr **attrs)
2136{
2137 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2138 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2139 struct xfrm_kmaddress km, *kmp;
2140 u8 type;
2141 int err;
2142 int n = 0;
2143 struct net *net = sock_net(skb->sk);
2144
2145 if (attrs[XFRMA_MIGRATE] == NULL)
2146 return -EINVAL;
2147
2148 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2149
2150 err = copy_from_user_policy_type(&type, attrs);
2151 if (err)
2152 return err;
2153
2154 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2155 if (err)
2156 return err;
2157
2158 if (!n)
2159 return 0;
2160
2161 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2162
2163 return 0;
2164}
2165#else
2166static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2167 struct nlattr **attrs)
2168{
2169 return -ENOPROTOOPT;
2170}
2171#endif
2172
2173#ifdef CONFIG_XFRM_MIGRATE
2174static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2175{
2176 struct xfrm_user_migrate um;
2177
2178 memset(&um, 0, sizeof(um));
2179 um.proto = m->proto;
2180 um.mode = m->mode;
2181 um.reqid = m->reqid;
2182 um.old_family = m->old_family;
2183 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2184 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2185 um.new_family = m->new_family;
2186 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2187 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2188
2189 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2190}
2191
2192static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2193{
2194 struct xfrm_user_kmaddress uk;
2195
2196 memset(&uk, 0, sizeof(uk));
2197 uk.family = k->family;
2198 uk.reserved = k->reserved;
2199 memcpy(&uk.local, &k->local, sizeof(uk.local));
2200 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2201
2202 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2203}
2204
2205static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2206{
2207 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2208 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2209 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2210 + userpolicy_type_attrsize();
2211}
2212
2213static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2214 int num_migrate, const struct xfrm_kmaddress *k,
2215 const struct xfrm_selector *sel, u8 dir, u8 type)
2216{
2217 const struct xfrm_migrate *mp;
2218 struct xfrm_userpolicy_id *pol_id;
2219 struct nlmsghdr *nlh;
2220 int i, err;
2221
2222 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2223 if (nlh == NULL)
2224 return -EMSGSIZE;
2225
2226 pol_id = nlmsg_data(nlh);
2227 /* copy data from selector, dir, and type to the pol_id */
2228 memset(pol_id, 0, sizeof(*pol_id));
2229 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2230 pol_id->dir = dir;
2231
2232 if (k != NULL) {
2233 err = copy_to_user_kmaddress(k, skb);
2234 if (err)
2235 goto out_cancel;
2236 }
2237 err = copy_to_user_policy_type(type, skb);
2238 if (err)
2239 goto out_cancel;
2240 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2241 err = copy_to_user_migrate(mp, skb);
2242 if (err)
2243 goto out_cancel;
2244 }
2245
2246 return nlmsg_end(skb, nlh);
2247
2248out_cancel:
2249 nlmsg_cancel(skb, nlh);
2250 return err;
2251}
2252
2253static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2254 const struct xfrm_migrate *m, int num_migrate,
2255 const struct xfrm_kmaddress *k)
2256{
2257 struct net *net = &init_net;
2258 struct sk_buff *skb;
2259
2260 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2261 if (skb == NULL)
2262 return -ENOMEM;
2263
2264 /* build migrate */
2265 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2266 BUG();
2267
2268 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2269}
2270#else
2271static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2272 const struct xfrm_migrate *m, int num_migrate,
2273 const struct xfrm_kmaddress *k)
2274{
2275 return -ENOPROTOOPT;
2276}
2277#endif
2278
2279#define XMSGSIZE(type) sizeof(struct type)
2280
2281static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2282 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2283 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2284 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2285 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2286 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2287 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2288 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2289 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2290 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2291 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2292 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2293 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2294 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2295 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2296 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2297 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2298 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2299 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2300 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2301 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2302};
2303
2304#undef XMSGSIZE
2305
2306static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2307 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2308 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2309 [XFRMA_LASTUSED] = { .type = NLA_U64},
2310 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2311 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2312 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2313 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2314 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2315 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2316 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2317 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2318 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2319 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2320 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2321 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2322 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2323 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2324 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2325 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2326 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2327 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2328 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2329 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2330 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2331 [XFRMA_PROTO] = { .type = NLA_U8 },
2332 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2333};
2334
2335static const struct xfrm_link {
2336 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2337 int (*dump)(struct sk_buff *, struct netlink_callback *);
2338 int (*done)(struct netlink_callback *);
2339} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2340 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2341 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2342 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2343 .dump = xfrm_dump_sa,
2344 .done = xfrm_dump_sa_done },
2345 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2346 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2347 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2348 .dump = xfrm_dump_policy,
2349 .done = xfrm_dump_policy_done },
2350 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2351 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2352 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2353 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2354 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2355 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2356 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2357 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2358 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2359 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2360 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2361 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2362 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2363};
2364
2365static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2366{
2367 struct net *net = sock_net(skb->sk);
2368 struct nlattr *attrs[XFRMA_MAX+1];
2369 const struct xfrm_link *link;
2370 int type, err;
2371
2372 type = nlh->nlmsg_type;
2373 if (type > XFRM_MSG_MAX)
2374 return -EINVAL;
2375
2376 type -= XFRM_MSG_BASE;
2377 link = &xfrm_dispatch[type];
2378
2379 /* All operations require privileges, even GET */
2380 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2381 return -EPERM;
2382
2383 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2384 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2385 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2386 if (link->dump == NULL)
2387 return -EINVAL;
2388
2389 {
2390 struct netlink_dump_control c = {
2391 .dump = link->dump,
2392 .done = link->done,
2393 };
2394 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2395 }
2396 }
2397
2398 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2399 xfrma_policy);
2400 if (err < 0)
2401 return err;
2402
2403 if (link->doit == NULL)
2404 return -EINVAL;
2405
2406 return link->doit(skb, nlh, attrs);
2407}
2408
2409static void xfrm_netlink_rcv(struct sk_buff *skb)
2410{
2411 struct net *net = sock_net(skb->sk);
2412
2413 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2414 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2415 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2416}
2417
2418static inline size_t xfrm_expire_msgsize(void)
2419{
2420 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2421 + nla_total_size(sizeof(struct xfrm_mark));
2422}
2423
2424static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2425{
2426 struct xfrm_user_expire *ue;
2427 struct nlmsghdr *nlh;
2428 int err;
2429
2430 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2431 if (nlh == NULL)
2432 return -EMSGSIZE;
2433
2434 ue = nlmsg_data(nlh);
2435 copy_to_user_state(x, &ue->state);
2436 ue->hard = (c->data.hard != 0) ? 1 : 0;
2437
2438 err = xfrm_mark_put(skb, &x->mark);
2439 if (err)
2440 return err;
2441
2442 return nlmsg_end(skb, nlh);
2443}
2444
2445static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2446{
2447 struct net *net = xs_net(x);
2448 struct sk_buff *skb;
2449
2450 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2451 if (skb == NULL)
2452 return -ENOMEM;
2453
2454 if (build_expire(skb, x, c) < 0) {
2455 kfree_skb(skb);
2456 return -EMSGSIZE;
2457 }
2458
2459 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2460}
2461
2462static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2463{
2464 struct net *net = xs_net(x);
2465 struct sk_buff *skb;
2466
2467 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2468 if (skb == NULL)
2469 return -ENOMEM;
2470
2471 if (build_aevent(skb, x, c) < 0)
2472 BUG();
2473
2474 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2475}
2476
2477static int xfrm_notify_sa_flush(const struct km_event *c)
2478{
2479 struct net *net = c->net;
2480 struct xfrm_usersa_flush *p;
2481 struct nlmsghdr *nlh;
2482 struct sk_buff *skb;
2483 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2484
2485 skb = nlmsg_new(len, GFP_ATOMIC);
2486 if (skb == NULL)
2487 return -ENOMEM;
2488
2489 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2490 if (nlh == NULL) {
2491 kfree_skb(skb);
2492 return -EMSGSIZE;
2493 }
2494
2495 p = nlmsg_data(nlh);
2496 p->proto = c->data.proto;
2497
2498 nlmsg_end(skb, nlh);
2499
2500 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2501}
2502
2503static inline size_t xfrm_sa_len(struct xfrm_state *x)
2504{
2505 size_t l = 0;
2506 if (x->aead)
2507 l += nla_total_size(aead_len(x->aead));
2508 if (x->aalg) {
2509 l += nla_total_size(sizeof(struct xfrm_algo) +
2510 (x->aalg->alg_key_len + 7) / 8);
2511 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2512 }
2513 if (x->ealg)
2514 l += nla_total_size(xfrm_alg_len(x->ealg));
2515 if (x->calg)
2516 l += nla_total_size(sizeof(*x->calg));
2517 if (x->encap)
2518 l += nla_total_size(sizeof(*x->encap));
2519 if (x->tfcpad)
2520 l += nla_total_size(sizeof(x->tfcpad));
2521 if (x->replay_esn)
2522 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2523 if (x->security)
2524 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2525 x->security->ctx_len);
2526 if (x->coaddr)
2527 l += nla_total_size(sizeof(*x->coaddr));
2528 if (x->props.extra_flags)
2529 l += nla_total_size(sizeof(x->props.extra_flags));
2530
2531 /* Must count x->lastused as it may become non-zero behind our back. */
2532 l += nla_total_size(sizeof(u64));
2533
2534 return l;
2535}
2536
2537static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2538{
2539 struct net *net = xs_net(x);
2540 struct xfrm_usersa_info *p;
2541 struct xfrm_usersa_id *id;
2542 struct nlmsghdr *nlh;
2543 struct sk_buff *skb;
2544 int len = xfrm_sa_len(x);
2545 int headlen, err;
2546
2547 headlen = sizeof(*p);
2548 if (c->event == XFRM_MSG_DELSA) {
2549 len += nla_total_size(headlen);
2550 headlen = sizeof(*id);
2551 len += nla_total_size(sizeof(struct xfrm_mark));
2552 }
2553 len += NLMSG_ALIGN(headlen);
2554
2555 skb = nlmsg_new(len, GFP_ATOMIC);
2556 if (skb == NULL)
2557 return -ENOMEM;
2558
2559 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2560 err = -EMSGSIZE;
2561 if (nlh == NULL)
2562 goto out_free_skb;
2563
2564 p = nlmsg_data(nlh);
2565 if (c->event == XFRM_MSG_DELSA) {
2566 struct nlattr *attr;
2567
2568 id = nlmsg_data(nlh);
2569 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2570 id->spi = x->id.spi;
2571 id->family = x->props.family;
2572 id->proto = x->id.proto;
2573
2574 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2575 err = -EMSGSIZE;
2576 if (attr == NULL)
2577 goto out_free_skb;
2578
2579 p = nla_data(attr);
2580 }
2581 err = copy_to_user_state_extra(x, p, skb);
2582 if (err)
2583 goto out_free_skb;
2584
2585 nlmsg_end(skb, nlh);
2586
2587 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2588
2589out_free_skb:
2590 kfree_skb(skb);
2591 return err;
2592}
2593
2594static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2595{
2596
2597 switch (c->event) {
2598 case XFRM_MSG_EXPIRE:
2599 return xfrm_exp_state_notify(x, c);
2600 case XFRM_MSG_NEWAE:
2601 return xfrm_aevent_state_notify(x, c);
2602 case XFRM_MSG_DELSA:
2603 case XFRM_MSG_UPDSA:
2604 case XFRM_MSG_NEWSA:
2605 return xfrm_notify_sa(x, c);
2606 case XFRM_MSG_FLUSHSA:
2607 return xfrm_notify_sa_flush(c);
2608 default:
2609 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2610 c->event);
2611 break;
2612 }
2613
2614 return 0;
2615
2616}
2617
2618static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2619 struct xfrm_policy *xp)
2620{
2621 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2622 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2623 + nla_total_size(sizeof(struct xfrm_mark))
2624 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2625 + userpolicy_type_attrsize();
2626}
2627
2628static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2629 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2630{
2631 __u32 seq = xfrm_get_acqseq();
2632 struct xfrm_user_acquire *ua;
2633 struct nlmsghdr *nlh;
2634 int err;
2635
2636 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2637 if (nlh == NULL)
2638 return -EMSGSIZE;
2639
2640 ua = nlmsg_data(nlh);
2641 memcpy(&ua->id, &x->id, sizeof(ua->id));
2642 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2643 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2644 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2645 ua->aalgos = xt->aalgos;
2646 ua->ealgos = xt->ealgos;
2647 ua->calgos = xt->calgos;
2648 ua->seq = x->km.seq = seq;
2649
2650 err = copy_to_user_tmpl(xp, skb);
2651 if (!err)
2652 err = copy_to_user_state_sec_ctx(x, skb);
2653 if (!err)
2654 err = copy_to_user_policy_type(xp->type, skb);
2655 if (!err)
2656 err = xfrm_mark_put(skb, &xp->mark);
2657 if (err) {
2658 nlmsg_cancel(skb, nlh);
2659 return err;
2660 }
2661
2662 return nlmsg_end(skb, nlh);
2663}
2664
2665static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2666 struct xfrm_policy *xp)
2667{
2668 struct net *net = xs_net(x);
2669 struct sk_buff *skb;
2670
2671 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2672 if (skb == NULL)
2673 return -ENOMEM;
2674
2675 if (build_acquire(skb, x, xt, xp) < 0)
2676 BUG();
2677
2678 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2679}
2680
2681/* User gives us xfrm_user_policy_info followed by an array of 0
2682 * or more templates.
2683 */
2684static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2685 u8 *data, int len, int *dir)
2686{
2687 struct net *net = sock_net(sk);
2688 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2689 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2690 struct xfrm_policy *xp;
2691 int nr;
2692
2693 switch (sk->sk_family) {
2694 case AF_INET:
2695 if (opt != IP_XFRM_POLICY) {
2696 *dir = -EOPNOTSUPP;
2697 return NULL;
2698 }
2699 break;
2700#if IS_ENABLED(CONFIG_IPV6)
2701 case AF_INET6:
2702 if (opt != IPV6_XFRM_POLICY) {
2703 *dir = -EOPNOTSUPP;
2704 return NULL;
2705 }
2706 break;
2707#endif
2708 default:
2709 *dir = -EINVAL;
2710 return NULL;
2711 }
2712
2713 *dir = -EINVAL;
2714
2715 if (len < sizeof(*p) ||
2716 verify_newpolicy_info(p))
2717 return NULL;
2718
2719 nr = ((len - sizeof(*p)) / sizeof(*ut));
2720 if (validate_tmpl(nr, ut, p->sel.family))
2721 return NULL;
2722
2723 if (p->dir > XFRM_POLICY_OUT)
2724 return NULL;
2725
2726 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2727 if (xp == NULL) {
2728 *dir = -ENOBUFS;
2729 return NULL;
2730 }
2731
2732 copy_from_user_policy(xp, p);
2733 xp->type = XFRM_POLICY_TYPE_MAIN;
2734 copy_templates(xp, ut, nr);
2735
2736 *dir = p->dir;
2737
2738 return xp;
2739}
2740
2741static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2742{
2743 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2744 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2745 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2746 + nla_total_size(sizeof(struct xfrm_mark))
2747 + userpolicy_type_attrsize();
2748}
2749
2750static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2751 int dir, const struct km_event *c)
2752{
2753 struct xfrm_user_polexpire *upe;
2754 int hard = c->data.hard;
2755 struct nlmsghdr *nlh;
2756 int err;
2757
2758 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2759 if (nlh == NULL)
2760 return -EMSGSIZE;
2761
2762 upe = nlmsg_data(nlh);
2763 copy_to_user_policy(xp, &upe->pol, dir);
2764 err = copy_to_user_tmpl(xp, skb);
2765 if (!err)
2766 err = copy_to_user_sec_ctx(xp, skb);
2767 if (!err)
2768 err = copy_to_user_policy_type(xp->type, skb);
2769 if (!err)
2770 err = xfrm_mark_put(skb, &xp->mark);
2771 if (err) {
2772 nlmsg_cancel(skb, nlh);
2773 return err;
2774 }
2775 upe->hard = !!hard;
2776
2777 return nlmsg_end(skb, nlh);
2778}
2779
2780static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2781{
2782 struct net *net = xp_net(xp);
2783 struct sk_buff *skb;
2784
2785 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2786 if (skb == NULL)
2787 return -ENOMEM;
2788
2789 if (build_polexpire(skb, xp, dir, c) < 0)
2790 BUG();
2791
2792 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2793}
2794
2795static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2796{
2797 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2798 struct net *net = xp_net(xp);
2799 struct xfrm_userpolicy_info *p;
2800 struct xfrm_userpolicy_id *id;
2801 struct nlmsghdr *nlh;
2802 struct sk_buff *skb;
2803 int headlen, err;
2804
2805 headlen = sizeof(*p);
2806 if (c->event == XFRM_MSG_DELPOLICY) {
2807 len += nla_total_size(headlen);
2808 headlen = sizeof(*id);
2809 }
2810 len += userpolicy_type_attrsize();
2811 len += nla_total_size(sizeof(struct xfrm_mark));
2812 len += NLMSG_ALIGN(headlen);
2813
2814 skb = nlmsg_new(len, GFP_ATOMIC);
2815 if (skb == NULL)
2816 return -ENOMEM;
2817
2818 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2819 err = -EMSGSIZE;
2820 if (nlh == NULL)
2821 goto out_free_skb;
2822
2823 p = nlmsg_data(nlh);
2824 if (c->event == XFRM_MSG_DELPOLICY) {
2825 struct nlattr *attr;
2826
2827 id = nlmsg_data(nlh);
2828 memset(id, 0, sizeof(*id));
2829 id->dir = dir;
2830 if (c->data.byid)
2831 id->index = xp->index;
2832 else
2833 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2834
2835 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2836 err = -EMSGSIZE;
2837 if (attr == NULL)
2838 goto out_free_skb;
2839
2840 p = nla_data(attr);
2841 }
2842
2843 copy_to_user_policy(xp, p, dir);
2844 err = copy_to_user_tmpl(xp, skb);
2845 if (!err)
2846 err = copy_to_user_policy_type(xp->type, skb);
2847 if (!err)
2848 err = xfrm_mark_put(skb, &xp->mark);
2849 if (err)
2850 goto out_free_skb;
2851
2852 nlmsg_end(skb, nlh);
2853
2854 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2855
2856out_free_skb:
2857 kfree_skb(skb);
2858 return err;
2859}
2860
2861static int xfrm_notify_policy_flush(const struct km_event *c)
2862{
2863 struct net *net = c->net;
2864 struct nlmsghdr *nlh;
2865 struct sk_buff *skb;
2866 int err;
2867
2868 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2869 if (skb == NULL)
2870 return -ENOMEM;
2871
2872 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2873 err = -EMSGSIZE;
2874 if (nlh == NULL)
2875 goto out_free_skb;
2876 err = copy_to_user_policy_type(c->data.type, skb);
2877 if (err)
2878 goto out_free_skb;
2879
2880 nlmsg_end(skb, nlh);
2881
2882 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2883
2884out_free_skb:
2885 kfree_skb(skb);
2886 return err;
2887}
2888
2889static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2890{
2891
2892 switch (c->event) {
2893 case XFRM_MSG_NEWPOLICY:
2894 case XFRM_MSG_UPDPOLICY:
2895 case XFRM_MSG_DELPOLICY:
2896 return xfrm_notify_policy(xp, dir, c);
2897 case XFRM_MSG_FLUSHPOLICY:
2898 return xfrm_notify_policy_flush(c);
2899 case XFRM_MSG_POLEXPIRE:
2900 return xfrm_exp_policy_notify(xp, dir, c);
2901 default:
2902 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2903 c->event);
2904 }
2905
2906 return 0;
2907
2908}
2909
2910static inline size_t xfrm_report_msgsize(void)
2911{
2912 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2913}
2914
2915static int build_report(struct sk_buff *skb, u8 proto,
2916 struct xfrm_selector *sel, xfrm_address_t *addr)
2917{
2918 struct xfrm_user_report *ur;
2919 struct nlmsghdr *nlh;
2920
2921 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2922 if (nlh == NULL)
2923 return -EMSGSIZE;
2924
2925 ur = nlmsg_data(nlh);
2926 ur->proto = proto;
2927 memcpy(&ur->sel, sel, sizeof(ur->sel));
2928
2929 if (addr) {
2930 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2931 if (err) {
2932 nlmsg_cancel(skb, nlh);
2933 return err;
2934 }
2935 }
2936 return nlmsg_end(skb, nlh);
2937}
2938
2939static int xfrm_send_report(struct net *net, u8 proto,
2940 struct xfrm_selector *sel, xfrm_address_t *addr)
2941{
2942 struct sk_buff *skb;
2943
2944 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2945 if (skb == NULL)
2946 return -ENOMEM;
2947
2948 if (build_report(skb, proto, sel, addr) < 0)
2949 BUG();
2950
2951 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2952}
2953
2954static inline size_t xfrm_mapping_msgsize(void)
2955{
2956 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2957}
2958
2959static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2960 xfrm_address_t *new_saddr, __be16 new_sport)
2961{
2962 struct xfrm_user_mapping *um;
2963 struct nlmsghdr *nlh;
2964
2965 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2966 if (nlh == NULL)
2967 return -EMSGSIZE;
2968
2969 um = nlmsg_data(nlh);
2970
2971 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2972 um->id.spi = x->id.spi;
2973 um->id.family = x->props.family;
2974 um->id.proto = x->id.proto;
2975 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2976 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2977 um->new_sport = new_sport;
2978 um->old_sport = x->encap->encap_sport;
2979 um->reqid = x->props.reqid;
2980
2981 return nlmsg_end(skb, nlh);
2982}
2983
2984static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2985 __be16 sport)
2986{
2987 struct net *net = xs_net(x);
2988 struct sk_buff *skb;
2989
2990 if (x->id.proto != IPPROTO_ESP)
2991 return -EINVAL;
2992
2993 if (!x->encap)
2994 return -EINVAL;
2995
2996 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2997 if (skb == NULL)
2998 return -ENOMEM;
2999
3000 if (build_mapping(skb, x, ipaddr, sport) < 0)
3001 BUG();
3002
3003 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
3004}
3005
3006static bool xfrm_is_alive(const struct km_event *c)
3007{
3008 return (bool)xfrm_acquire_is_on(c->net);
3009}
3010
3011static struct xfrm_mgr netlink_mgr = {
3012 .id = "netlink",
3013 .notify = xfrm_send_state_notify,
3014 .acquire = xfrm_send_acquire,
3015 .compile_policy = xfrm_compile_policy,
3016 .notify_policy = xfrm_send_policy_notify,
3017 .report = xfrm_send_report,
3018 .migrate = xfrm_send_migrate,
3019 .new_mapping = xfrm_send_mapping,
3020 .is_alive = xfrm_is_alive,
3021};
3022
3023static int __net_init xfrm_user_net_init(struct net *net)
3024{
3025 struct sock *nlsk;
3026 struct netlink_kernel_cfg cfg = {
3027 .groups = XFRMNLGRP_MAX,
3028 .input = xfrm_netlink_rcv,
3029 };
3030
3031 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3032 if (nlsk == NULL)
3033 return -ENOMEM;
3034 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3035 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3036 return 0;
3037}
3038
3039static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3040{
3041 struct net *net;
3042 list_for_each_entry(net, net_exit_list, exit_list)
3043 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3044 synchronize_net();
3045 list_for_each_entry(net, net_exit_list, exit_list)
3046 netlink_kernel_release(net->xfrm.nlsk_stash);
3047}
3048
3049static struct pernet_operations xfrm_user_net_ops = {
3050 .init = xfrm_user_net_init,
3051 .exit_batch = xfrm_user_net_exit,
3052};
3053
3054static int __init xfrm_user_init(void)
3055{
3056 int rv;
3057
3058 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3059
3060 rv = register_pernet_subsys(&xfrm_user_net_ops);
3061 if (rv < 0)
3062 return rv;
3063 rv = xfrm_register_km(&netlink_mgr);
3064 if (rv < 0)
3065 unregister_pernet_subsys(&xfrm_user_net_ops);
3066 return rv;
3067}
3068
3069static void __exit xfrm_user_exit(void)
3070{
3071 xfrm_unregister_km(&netlink_mgr);
3072 unregister_pernet_subsys(&xfrm_user_net_ops);
3073}
3074
3075module_init(xfrm_user_init);
3076module_exit(xfrm_user_exit);
3077MODULE_LICENSE("GPL");
3078MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3079