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