Loading...
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// SPDX-License-Identifier: GPL-2.0-only
2/* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
14#include <linux/crypto.h>
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/socket.h>
20#include <linux/string.h>
21#include <linux/net.h>
22#include <linux/skbuff.h>
23#include <linux/pfkeyv2.h>
24#include <linux/ipsec.h>
25#include <linux/init.h>
26#include <linux/security.h>
27#include <net/sock.h>
28#include <net/xfrm.h>
29#include <net/netlink.h>
30#include <net/ah.h>
31#include <linux/uaccess.h>
32#if IS_ENABLED(CONFIG_IPV6)
33#include <linux/in6.h>
34#endif
35#include <asm/unaligned.h>
36
37static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
38{
39 struct nlattr *rt = attrs[type];
40 struct xfrm_algo *algp;
41
42 if (!rt)
43 return 0;
44
45 algp = nla_data(rt);
46 if (nla_len(rt) < (int)xfrm_alg_len(algp))
47 return -EINVAL;
48
49 switch (type) {
50 case XFRMA_ALG_AUTH:
51 case XFRMA_ALG_CRYPT:
52 case XFRMA_ALG_COMP:
53 break;
54
55 default:
56 return -EINVAL;
57 }
58
59 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
60 return 0;
61}
62
63static int verify_auth_trunc(struct nlattr **attrs)
64{
65 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
66 struct xfrm_algo_auth *algp;
67
68 if (!rt)
69 return 0;
70
71 algp = nla_data(rt);
72 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
73 return -EINVAL;
74
75 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
76 return 0;
77}
78
79static int verify_aead(struct nlattr **attrs)
80{
81 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
82 struct xfrm_algo_aead *algp;
83
84 if (!rt)
85 return 0;
86
87 algp = nla_data(rt);
88 if (nla_len(rt) < (int)aead_len(algp))
89 return -EINVAL;
90
91 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
92 return 0;
93}
94
95static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
96 xfrm_address_t **addrp)
97{
98 struct nlattr *rt = attrs[type];
99
100 if (rt && addrp)
101 *addrp = nla_data(rt);
102}
103
104static inline int verify_sec_ctx_len(struct nlattr **attrs)
105{
106 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
107 struct xfrm_user_sec_ctx *uctx;
108
109 if (!rt)
110 return 0;
111
112 uctx = nla_data(rt);
113 if (uctx->len > nla_len(rt) ||
114 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
115 return -EINVAL;
116
117 return 0;
118}
119
120static inline int verify_replay(struct xfrm_usersa_info *p,
121 struct nlattr **attrs)
122{
123 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
124 struct xfrm_replay_state_esn *rs;
125
126 if (!rt)
127 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
128
129 rs = nla_data(rt);
130
131 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
132 return -EINVAL;
133
134 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
135 nla_len(rt) != sizeof(*rs))
136 return -EINVAL;
137
138 /* As only ESP and AH support ESN feature. */
139 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
140 return -EINVAL;
141
142 if (p->replay_window != 0)
143 return -EINVAL;
144
145 return 0;
146}
147
148static int verify_newsa_info(struct xfrm_usersa_info *p,
149 struct nlattr **attrs)
150{
151 int err;
152
153 err = -EINVAL;
154 switch (p->family) {
155 case AF_INET:
156 break;
157
158 case AF_INET6:
159#if IS_ENABLED(CONFIG_IPV6)
160 break;
161#else
162 err = -EAFNOSUPPORT;
163 goto out;
164#endif
165
166 default:
167 goto out;
168 }
169
170 switch (p->sel.family) {
171 case AF_UNSPEC:
172 break;
173
174 case AF_INET:
175 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
176 goto out;
177
178 break;
179
180 case AF_INET6:
181#if IS_ENABLED(CONFIG_IPV6)
182 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
183 goto out;
184
185 break;
186#else
187 err = -EAFNOSUPPORT;
188 goto out;
189#endif
190
191 default:
192 goto out;
193 }
194
195 err = -EINVAL;
196 switch (p->id.proto) {
197 case IPPROTO_AH:
198 if ((!attrs[XFRMA_ALG_AUTH] &&
199 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
200 attrs[XFRMA_ALG_AEAD] ||
201 attrs[XFRMA_ALG_CRYPT] ||
202 attrs[XFRMA_ALG_COMP] ||
203 attrs[XFRMA_TFCPAD])
204 goto out;
205 break;
206
207 case IPPROTO_ESP:
208 if (attrs[XFRMA_ALG_COMP])
209 goto out;
210 if (!attrs[XFRMA_ALG_AUTH] &&
211 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
212 !attrs[XFRMA_ALG_CRYPT] &&
213 !attrs[XFRMA_ALG_AEAD])
214 goto out;
215 if ((attrs[XFRMA_ALG_AUTH] ||
216 attrs[XFRMA_ALG_AUTH_TRUNC] ||
217 attrs[XFRMA_ALG_CRYPT]) &&
218 attrs[XFRMA_ALG_AEAD])
219 goto out;
220 if (attrs[XFRMA_TFCPAD] &&
221 p->mode != XFRM_MODE_TUNNEL)
222 goto out;
223 break;
224
225 case IPPROTO_COMP:
226 if (!attrs[XFRMA_ALG_COMP] ||
227 attrs[XFRMA_ALG_AEAD] ||
228 attrs[XFRMA_ALG_AUTH] ||
229 attrs[XFRMA_ALG_AUTH_TRUNC] ||
230 attrs[XFRMA_ALG_CRYPT] ||
231 attrs[XFRMA_TFCPAD] ||
232 (ntohl(p->id.spi) >= 0x10000))
233 goto out;
234 break;
235
236#if IS_ENABLED(CONFIG_IPV6)
237 case IPPROTO_DSTOPTS:
238 case IPPROTO_ROUTING:
239 if (attrs[XFRMA_ALG_COMP] ||
240 attrs[XFRMA_ALG_AUTH] ||
241 attrs[XFRMA_ALG_AUTH_TRUNC] ||
242 attrs[XFRMA_ALG_AEAD] ||
243 attrs[XFRMA_ALG_CRYPT] ||
244 attrs[XFRMA_ENCAP] ||
245 attrs[XFRMA_SEC_CTX] ||
246 attrs[XFRMA_TFCPAD] ||
247 !attrs[XFRMA_COADDR])
248 goto out;
249 break;
250#endif
251
252 default:
253 goto out;
254 }
255
256 if ((err = verify_aead(attrs)))
257 goto out;
258 if ((err = verify_auth_trunc(attrs)))
259 goto out;
260 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
261 goto out;
262 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
263 goto out;
264 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
265 goto out;
266 if ((err = verify_sec_ctx_len(attrs)))
267 goto out;
268 if ((err = verify_replay(p, attrs)))
269 goto out;
270
271 err = -EINVAL;
272 switch (p->mode) {
273 case XFRM_MODE_TRANSPORT:
274 case XFRM_MODE_TUNNEL:
275 case XFRM_MODE_ROUTEOPTIMIZATION:
276 case XFRM_MODE_BEET:
277 break;
278
279 default:
280 goto out;
281 }
282
283 err = 0;
284
285out:
286 return err;
287}
288
289static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
290 struct xfrm_algo_desc *(*get_byname)(const char *, int),
291 struct nlattr *rta)
292{
293 struct xfrm_algo *p, *ualg;
294 struct xfrm_algo_desc *algo;
295
296 if (!rta)
297 return 0;
298
299 ualg = nla_data(rta);
300
301 algo = get_byname(ualg->alg_name, 1);
302 if (!algo)
303 return -ENOSYS;
304 *props = algo->desc.sadb_alg_id;
305
306 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
307 if (!p)
308 return -ENOMEM;
309
310 strcpy(p->alg_name, algo->name);
311 *algpp = p;
312 return 0;
313}
314
315static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
316{
317 struct xfrm_algo *p, *ualg;
318 struct xfrm_algo_desc *algo;
319
320 if (!rta)
321 return 0;
322
323 ualg = nla_data(rta);
324
325 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
326 if (!algo)
327 return -ENOSYS;
328 x->props.ealgo = algo->desc.sadb_alg_id;
329
330 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
331 if (!p)
332 return -ENOMEM;
333
334 strcpy(p->alg_name, algo->name);
335 x->ealg = p;
336 x->geniv = algo->uinfo.encr.geniv;
337 return 0;
338}
339
340static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
341 struct nlattr *rta)
342{
343 struct xfrm_algo *ualg;
344 struct xfrm_algo_auth *p;
345 struct xfrm_algo_desc *algo;
346
347 if (!rta)
348 return 0;
349
350 ualg = nla_data(rta);
351
352 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
353 if (!algo)
354 return -ENOSYS;
355 *props = algo->desc.sadb_alg_id;
356
357 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
358 if (!p)
359 return -ENOMEM;
360
361 strcpy(p->alg_name, algo->name);
362 p->alg_key_len = ualg->alg_key_len;
363 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
364 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
365
366 *algpp = p;
367 return 0;
368}
369
370static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
371 struct nlattr *rta)
372{
373 struct xfrm_algo_auth *p, *ualg;
374 struct xfrm_algo_desc *algo;
375
376 if (!rta)
377 return 0;
378
379 ualg = nla_data(rta);
380
381 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
382 if (!algo)
383 return -ENOSYS;
384 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
385 return -EINVAL;
386 *props = algo->desc.sadb_alg_id;
387
388 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
389 if (!p)
390 return -ENOMEM;
391
392 strcpy(p->alg_name, algo->name);
393 if (!p->alg_trunc_len)
394 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
395
396 *algpp = p;
397 return 0;
398}
399
400static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
401{
402 struct xfrm_algo_aead *p, *ualg;
403 struct xfrm_algo_desc *algo;
404
405 if (!rta)
406 return 0;
407
408 ualg = nla_data(rta);
409
410 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
411 if (!algo)
412 return -ENOSYS;
413 x->props.ealgo = algo->desc.sadb_alg_id;
414
415 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
416 if (!p)
417 return -ENOMEM;
418
419 strcpy(p->alg_name, algo->name);
420 x->aead = p;
421 x->geniv = algo->uinfo.aead.geniv;
422 return 0;
423}
424
425static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
426 struct nlattr *rp)
427{
428 struct xfrm_replay_state_esn *up;
429 unsigned int ulen;
430
431 if (!replay_esn || !rp)
432 return 0;
433
434 up = nla_data(rp);
435 ulen = xfrm_replay_state_esn_len(up);
436
437 /* Check the overall length and the internal bitmap length to avoid
438 * potential overflow. */
439 if (nla_len(rp) < (int)ulen ||
440 xfrm_replay_state_esn_len(replay_esn) != ulen ||
441 replay_esn->bmp_len != up->bmp_len)
442 return -EINVAL;
443
444 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
445 return -EINVAL;
446
447 return 0;
448}
449
450static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
451 struct xfrm_replay_state_esn **preplay_esn,
452 struct nlattr *rta)
453{
454 struct xfrm_replay_state_esn *p, *pp, *up;
455 unsigned int klen, ulen;
456
457 if (!rta)
458 return 0;
459
460 up = nla_data(rta);
461 klen = xfrm_replay_state_esn_len(up);
462 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
463
464 p = kzalloc(klen, GFP_KERNEL);
465 if (!p)
466 return -ENOMEM;
467
468 pp = kzalloc(klen, GFP_KERNEL);
469 if (!pp) {
470 kfree(p);
471 return -ENOMEM;
472 }
473
474 memcpy(p, up, ulen);
475 memcpy(pp, up, ulen);
476
477 *replay_esn = p;
478 *preplay_esn = pp;
479
480 return 0;
481}
482
483static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
484{
485 unsigned int len = 0;
486
487 if (xfrm_ctx) {
488 len += sizeof(struct xfrm_user_sec_ctx);
489 len += xfrm_ctx->ctx_len;
490 }
491 return len;
492}
493
494static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
495{
496 memcpy(&x->id, &p->id, sizeof(x->id));
497 memcpy(&x->sel, &p->sel, sizeof(x->sel));
498 memcpy(&x->lft, &p->lft, sizeof(x->lft));
499 x->props.mode = p->mode;
500 x->props.replay_window = min_t(unsigned int, p->replay_window,
501 sizeof(x->replay.bitmap) * 8);
502 x->props.reqid = p->reqid;
503 x->props.family = p->family;
504 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
505 x->props.flags = p->flags;
506
507 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
508 x->sel.family = p->family;
509}
510
511/*
512 * someday when pfkey also has support, we could have the code
513 * somehow made shareable and move it to xfrm_state.c - JHS
514 *
515*/
516static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
517 int update_esn)
518{
519 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
520 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
521 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
522 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
523 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
524
525 if (re) {
526 struct xfrm_replay_state_esn *replay_esn;
527 replay_esn = nla_data(re);
528 memcpy(x->replay_esn, replay_esn,
529 xfrm_replay_state_esn_len(replay_esn));
530 memcpy(x->preplay_esn, replay_esn,
531 xfrm_replay_state_esn_len(replay_esn));
532 }
533
534 if (rp) {
535 struct xfrm_replay_state *replay;
536 replay = nla_data(rp);
537 memcpy(&x->replay, replay, sizeof(*replay));
538 memcpy(&x->preplay, replay, sizeof(*replay));
539 }
540
541 if (lt) {
542 struct xfrm_lifetime_cur *ltime;
543 ltime = nla_data(lt);
544 x->curlft.bytes = ltime->bytes;
545 x->curlft.packets = ltime->packets;
546 x->curlft.add_time = ltime->add_time;
547 x->curlft.use_time = ltime->use_time;
548 }
549
550 if (et)
551 x->replay_maxage = nla_get_u32(et);
552
553 if (rt)
554 x->replay_maxdiff = nla_get_u32(rt);
555}
556
557static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
558{
559 if (attrs[XFRMA_SET_MARK]) {
560 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
561 if (attrs[XFRMA_SET_MARK_MASK])
562 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
563 else
564 m->m = 0xffffffff;
565 } else {
566 m->v = m->m = 0;
567 }
568}
569
570static struct xfrm_state *xfrm_state_construct(struct net *net,
571 struct xfrm_usersa_info *p,
572 struct nlattr **attrs,
573 int *errp)
574{
575 struct xfrm_state *x = xfrm_state_alloc(net);
576 int err = -ENOMEM;
577
578 if (!x)
579 goto error_no_put;
580
581 copy_from_user_state(x, p);
582
583 if (attrs[XFRMA_SA_EXTRA_FLAGS])
584 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
585
586 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
587 goto error;
588 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
589 attrs[XFRMA_ALG_AUTH_TRUNC])))
590 goto error;
591 if (!x->props.aalgo) {
592 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
593 attrs[XFRMA_ALG_AUTH])))
594 goto error;
595 }
596 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
597 goto error;
598 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
599 xfrm_calg_get_byname,
600 attrs[XFRMA_ALG_COMP])))
601 goto error;
602
603 if (attrs[XFRMA_ENCAP]) {
604 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
605 sizeof(*x->encap), GFP_KERNEL);
606 if (x->encap == NULL)
607 goto error;
608 }
609
610 if (attrs[XFRMA_TFCPAD])
611 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
612
613 if (attrs[XFRMA_COADDR]) {
614 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
615 sizeof(*x->coaddr), GFP_KERNEL);
616 if (x->coaddr == NULL)
617 goto error;
618 }
619
620 xfrm_mark_get(attrs, &x->mark);
621
622 xfrm_smark_init(attrs, &x->props.smark);
623
624 if (attrs[XFRMA_IF_ID])
625 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
626
627 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
628 if (err)
629 goto error;
630
631 if (attrs[XFRMA_SEC_CTX]) {
632 err = security_xfrm_state_alloc(x,
633 nla_data(attrs[XFRMA_SEC_CTX]));
634 if (err)
635 goto error;
636 }
637
638 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
639 attrs[XFRMA_REPLAY_ESN_VAL])))
640 goto error;
641
642 x->km.seq = p->seq;
643 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
644 /* sysctl_xfrm_aevent_etime is in 100ms units */
645 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
646
647 if ((err = xfrm_init_replay(x)))
648 goto error;
649
650 /* override default values from above */
651 xfrm_update_ae_params(x, attrs, 0);
652
653 /* configure the hardware if offload is requested */
654 if (attrs[XFRMA_OFFLOAD_DEV]) {
655 err = xfrm_dev_state_add(net, x,
656 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
657 if (err)
658 goto error;
659 }
660
661 return x;
662
663error:
664 x->km.state = XFRM_STATE_DEAD;
665 xfrm_state_put(x);
666error_no_put:
667 *errp = err;
668 return NULL;
669}
670
671static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
672 struct nlattr **attrs)
673{
674 struct net *net = sock_net(skb->sk);
675 struct xfrm_usersa_info *p = nlmsg_data(nlh);
676 struct xfrm_state *x;
677 int err;
678 struct km_event c;
679
680 err = verify_newsa_info(p, attrs);
681 if (err)
682 return err;
683
684 x = xfrm_state_construct(net, p, attrs, &err);
685 if (!x)
686 return err;
687
688 xfrm_state_hold(x);
689 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
690 err = xfrm_state_add(x);
691 else
692 err = xfrm_state_update(x);
693
694 xfrm_audit_state_add(x, err ? 0 : 1, true);
695
696 if (err < 0) {
697 x->km.state = XFRM_STATE_DEAD;
698 xfrm_dev_state_delete(x);
699 __xfrm_state_put(x);
700 goto out;
701 }
702
703 if (x->km.state == XFRM_STATE_VOID)
704 x->km.state = XFRM_STATE_VALID;
705
706 c.seq = nlh->nlmsg_seq;
707 c.portid = nlh->nlmsg_pid;
708 c.event = nlh->nlmsg_type;
709
710 km_state_notify(x, &c);
711out:
712 xfrm_state_put(x);
713 return err;
714}
715
716static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
717 struct xfrm_usersa_id *p,
718 struct nlattr **attrs,
719 int *errp)
720{
721 struct xfrm_state *x = NULL;
722 struct xfrm_mark m;
723 int err;
724 u32 mark = xfrm_mark_get(attrs, &m);
725
726 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
727 err = -ESRCH;
728 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
729 } else {
730 xfrm_address_t *saddr = NULL;
731
732 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
733 if (!saddr) {
734 err = -EINVAL;
735 goto out;
736 }
737
738 err = -ESRCH;
739 x = xfrm_state_lookup_byaddr(net, mark,
740 &p->daddr, saddr,
741 p->proto, p->family);
742 }
743
744 out:
745 if (!x && errp)
746 *errp = err;
747 return x;
748}
749
750static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
751 struct nlattr **attrs)
752{
753 struct net *net = sock_net(skb->sk);
754 struct xfrm_state *x;
755 int err = -ESRCH;
756 struct km_event c;
757 struct xfrm_usersa_id *p = nlmsg_data(nlh);
758
759 x = xfrm_user_state_lookup(net, p, attrs, &err);
760 if (x == NULL)
761 return err;
762
763 if ((err = security_xfrm_state_delete(x)) != 0)
764 goto out;
765
766 if (xfrm_state_kern(x)) {
767 err = -EPERM;
768 goto out;
769 }
770
771 err = xfrm_state_delete(x);
772
773 if (err < 0)
774 goto out;
775
776 c.seq = nlh->nlmsg_seq;
777 c.portid = nlh->nlmsg_pid;
778 c.event = nlh->nlmsg_type;
779 km_state_notify(x, &c);
780
781out:
782 xfrm_audit_state_delete(x, err ? 0 : 1, true);
783 xfrm_state_put(x);
784 return err;
785}
786
787static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
788{
789 memset(p, 0, sizeof(*p));
790 memcpy(&p->id, &x->id, sizeof(p->id));
791 memcpy(&p->sel, &x->sel, sizeof(p->sel));
792 memcpy(&p->lft, &x->lft, sizeof(p->lft));
793 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
794 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
795 put_unaligned(x->stats.replay, &p->stats.replay);
796 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
797 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
798 p->mode = x->props.mode;
799 p->replay_window = x->props.replay_window;
800 p->reqid = x->props.reqid;
801 p->family = x->props.family;
802 p->flags = x->props.flags;
803 p->seq = x->km.seq;
804}
805
806struct xfrm_dump_info {
807 struct sk_buff *in_skb;
808 struct sk_buff *out_skb;
809 u32 nlmsg_seq;
810 u16 nlmsg_flags;
811};
812
813static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
814{
815 struct xfrm_user_sec_ctx *uctx;
816 struct nlattr *attr;
817 int ctx_size = sizeof(*uctx) + s->ctx_len;
818
819 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
820 if (attr == NULL)
821 return -EMSGSIZE;
822
823 uctx = nla_data(attr);
824 uctx->exttype = XFRMA_SEC_CTX;
825 uctx->len = ctx_size;
826 uctx->ctx_doi = s->ctx_doi;
827 uctx->ctx_alg = s->ctx_alg;
828 uctx->ctx_len = s->ctx_len;
829 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
830
831 return 0;
832}
833
834static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
835{
836 struct xfrm_user_offload *xuo;
837 struct nlattr *attr;
838
839 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
840 if (attr == NULL)
841 return -EMSGSIZE;
842
843 xuo = nla_data(attr);
844 memset(xuo, 0, sizeof(*xuo));
845 xuo->ifindex = xso->dev->ifindex;
846 xuo->flags = xso->flags;
847
848 return 0;
849}
850
851static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
852{
853 struct xfrm_algo *algo;
854 struct nlattr *nla;
855
856 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
857 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
858 if (!nla)
859 return -EMSGSIZE;
860
861 algo = nla_data(nla);
862 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
863 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
864 algo->alg_key_len = auth->alg_key_len;
865
866 return 0;
867}
868
869static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
870{
871 int ret = 0;
872
873 if (m->v | m->m) {
874 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
875 if (!ret)
876 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
877 }
878 return ret;
879}
880
881/* Don't change this without updating xfrm_sa_len! */
882static int copy_to_user_state_extra(struct xfrm_state *x,
883 struct xfrm_usersa_info *p,
884 struct sk_buff *skb)
885{
886 int ret = 0;
887
888 copy_to_user_state(x, p);
889
890 if (x->props.extra_flags) {
891 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
892 x->props.extra_flags);
893 if (ret)
894 goto out;
895 }
896
897 if (x->coaddr) {
898 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
899 if (ret)
900 goto out;
901 }
902 if (x->lastused) {
903 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
904 XFRMA_PAD);
905 if (ret)
906 goto out;
907 }
908 if (x->aead) {
909 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
910 if (ret)
911 goto out;
912 }
913 if (x->aalg) {
914 ret = copy_to_user_auth(x->aalg, skb);
915 if (!ret)
916 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
917 xfrm_alg_auth_len(x->aalg), x->aalg);
918 if (ret)
919 goto out;
920 }
921 if (x->ealg) {
922 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
923 if (ret)
924 goto out;
925 }
926 if (x->calg) {
927 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
928 if (ret)
929 goto out;
930 }
931 if (x->encap) {
932 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
933 if (ret)
934 goto out;
935 }
936 if (x->tfcpad) {
937 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
938 if (ret)
939 goto out;
940 }
941 ret = xfrm_mark_put(skb, &x->mark);
942 if (ret)
943 goto out;
944
945 ret = xfrm_smark_put(skb, &x->props.smark);
946 if (ret)
947 goto out;
948
949 if (x->replay_esn)
950 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
951 xfrm_replay_state_esn_len(x->replay_esn),
952 x->replay_esn);
953 else
954 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
955 &x->replay);
956 if (ret)
957 goto out;
958 if(x->xso.dev)
959 ret = copy_user_offload(&x->xso, skb);
960 if (ret)
961 goto out;
962 if (x->if_id) {
963 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
964 if (ret)
965 goto out;
966 }
967 if (x->security)
968 ret = copy_sec_ctx(x->security, skb);
969out:
970 return ret;
971}
972
973static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
974{
975 struct xfrm_dump_info *sp = ptr;
976 struct sk_buff *in_skb = sp->in_skb;
977 struct sk_buff *skb = sp->out_skb;
978 struct xfrm_usersa_info *p;
979 struct nlmsghdr *nlh;
980 int err;
981
982 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
983 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
984 if (nlh == NULL)
985 return -EMSGSIZE;
986
987 p = nlmsg_data(nlh);
988
989 err = copy_to_user_state_extra(x, p, skb);
990 if (err) {
991 nlmsg_cancel(skb, nlh);
992 return err;
993 }
994 nlmsg_end(skb, nlh);
995 return 0;
996}
997
998static int xfrm_dump_sa_done(struct netlink_callback *cb)
999{
1000 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1001 struct sock *sk = cb->skb->sk;
1002 struct net *net = sock_net(sk);
1003
1004 if (cb->args[0])
1005 xfrm_state_walk_done(walk, net);
1006 return 0;
1007}
1008
1009static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1010static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1011{
1012 struct net *net = sock_net(skb->sk);
1013 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1014 struct xfrm_dump_info info;
1015
1016 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1017 sizeof(cb->args) - sizeof(cb->args[0]));
1018
1019 info.in_skb = cb->skb;
1020 info.out_skb = skb;
1021 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1022 info.nlmsg_flags = NLM_F_MULTI;
1023
1024 if (!cb->args[0]) {
1025 struct nlattr *attrs[XFRMA_MAX+1];
1026 struct xfrm_address_filter *filter = NULL;
1027 u8 proto = 0;
1028 int err;
1029
1030 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1031 xfrma_policy, cb->extack);
1032 if (err < 0)
1033 return err;
1034
1035 if (attrs[XFRMA_ADDRESS_FILTER]) {
1036 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1037 sizeof(*filter), GFP_KERNEL);
1038 if (filter == NULL)
1039 return -ENOMEM;
1040 }
1041
1042 if (attrs[XFRMA_PROTO])
1043 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1044
1045 xfrm_state_walk_init(walk, proto, filter);
1046 cb->args[0] = 1;
1047 }
1048
1049 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1050
1051 return skb->len;
1052}
1053
1054static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1055 struct xfrm_state *x, u32 seq)
1056{
1057 struct xfrm_dump_info info;
1058 struct sk_buff *skb;
1059 int err;
1060
1061 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1062 if (!skb)
1063 return ERR_PTR(-ENOMEM);
1064
1065 info.in_skb = in_skb;
1066 info.out_skb = skb;
1067 info.nlmsg_seq = seq;
1068 info.nlmsg_flags = 0;
1069
1070 err = dump_one_state(x, 0, &info);
1071 if (err) {
1072 kfree_skb(skb);
1073 return ERR_PTR(err);
1074 }
1075
1076 return skb;
1077}
1078
1079/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1080 * Must be called with RCU read lock.
1081 */
1082static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1083 u32 pid, unsigned int group)
1084{
1085 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1086
1087 if (!nlsk) {
1088 kfree_skb(skb);
1089 return -EPIPE;
1090 }
1091
1092 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1093}
1094
1095static inline unsigned int xfrm_spdinfo_msgsize(void)
1096{
1097 return NLMSG_ALIGN(4)
1098 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1099 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1100 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1101 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1102}
1103
1104static int build_spdinfo(struct sk_buff *skb, struct net *net,
1105 u32 portid, u32 seq, u32 flags)
1106{
1107 struct xfrmk_spdinfo si;
1108 struct xfrmu_spdinfo spc;
1109 struct xfrmu_spdhinfo sph;
1110 struct xfrmu_spdhthresh spt4, spt6;
1111 struct nlmsghdr *nlh;
1112 int err;
1113 u32 *f;
1114 unsigned lseq;
1115
1116 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1117 if (nlh == NULL) /* shouldn't really happen ... */
1118 return -EMSGSIZE;
1119
1120 f = nlmsg_data(nlh);
1121 *f = flags;
1122 xfrm_spd_getinfo(net, &si);
1123 spc.incnt = si.incnt;
1124 spc.outcnt = si.outcnt;
1125 spc.fwdcnt = si.fwdcnt;
1126 spc.inscnt = si.inscnt;
1127 spc.outscnt = si.outscnt;
1128 spc.fwdscnt = si.fwdscnt;
1129 sph.spdhcnt = si.spdhcnt;
1130 sph.spdhmcnt = si.spdhmcnt;
1131
1132 do {
1133 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1134
1135 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1136 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1137 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1138 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1139 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1140
1141 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1142 if (!err)
1143 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1144 if (!err)
1145 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1146 if (!err)
1147 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1148 if (err) {
1149 nlmsg_cancel(skb, nlh);
1150 return err;
1151 }
1152
1153 nlmsg_end(skb, nlh);
1154 return 0;
1155}
1156
1157static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1158 struct nlattr **attrs)
1159{
1160 struct net *net = sock_net(skb->sk);
1161 struct xfrmu_spdhthresh *thresh4 = NULL;
1162 struct xfrmu_spdhthresh *thresh6 = NULL;
1163
1164 /* selector prefixlen thresholds to hash policies */
1165 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1166 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1167
1168 if (nla_len(rta) < sizeof(*thresh4))
1169 return -EINVAL;
1170 thresh4 = nla_data(rta);
1171 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1172 return -EINVAL;
1173 }
1174 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1175 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1176
1177 if (nla_len(rta) < sizeof(*thresh6))
1178 return -EINVAL;
1179 thresh6 = nla_data(rta);
1180 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1181 return -EINVAL;
1182 }
1183
1184 if (thresh4 || thresh6) {
1185 write_seqlock(&net->xfrm.policy_hthresh.lock);
1186 if (thresh4) {
1187 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1188 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1189 }
1190 if (thresh6) {
1191 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1192 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1193 }
1194 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1195
1196 xfrm_policy_hash_rebuild(net);
1197 }
1198
1199 return 0;
1200}
1201
1202static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1203 struct nlattr **attrs)
1204{
1205 struct net *net = sock_net(skb->sk);
1206 struct sk_buff *r_skb;
1207 u32 *flags = nlmsg_data(nlh);
1208 u32 sportid = NETLINK_CB(skb).portid;
1209 u32 seq = nlh->nlmsg_seq;
1210 int err;
1211
1212 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1213 if (r_skb == NULL)
1214 return -ENOMEM;
1215
1216 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1217 BUG_ON(err < 0);
1218
1219 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1220}
1221
1222static inline unsigned int xfrm_sadinfo_msgsize(void)
1223{
1224 return NLMSG_ALIGN(4)
1225 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1226 + nla_total_size(4); /* XFRMA_SAD_CNT */
1227}
1228
1229static int build_sadinfo(struct sk_buff *skb, struct net *net,
1230 u32 portid, u32 seq, u32 flags)
1231{
1232 struct xfrmk_sadinfo si;
1233 struct xfrmu_sadhinfo sh;
1234 struct nlmsghdr *nlh;
1235 int err;
1236 u32 *f;
1237
1238 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1239 if (nlh == NULL) /* shouldn't really happen ... */
1240 return -EMSGSIZE;
1241
1242 f = nlmsg_data(nlh);
1243 *f = flags;
1244 xfrm_sad_getinfo(net, &si);
1245
1246 sh.sadhmcnt = si.sadhmcnt;
1247 sh.sadhcnt = si.sadhcnt;
1248
1249 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1250 if (!err)
1251 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1252 if (err) {
1253 nlmsg_cancel(skb, nlh);
1254 return err;
1255 }
1256
1257 nlmsg_end(skb, nlh);
1258 return 0;
1259}
1260
1261static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1262 struct nlattr **attrs)
1263{
1264 struct net *net = sock_net(skb->sk);
1265 struct sk_buff *r_skb;
1266 u32 *flags = nlmsg_data(nlh);
1267 u32 sportid = NETLINK_CB(skb).portid;
1268 u32 seq = nlh->nlmsg_seq;
1269 int err;
1270
1271 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1272 if (r_skb == NULL)
1273 return -ENOMEM;
1274
1275 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1276 BUG_ON(err < 0);
1277
1278 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1279}
1280
1281static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1282 struct nlattr **attrs)
1283{
1284 struct net *net = sock_net(skb->sk);
1285 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1286 struct xfrm_state *x;
1287 struct sk_buff *resp_skb;
1288 int err = -ESRCH;
1289
1290 x = xfrm_user_state_lookup(net, p, attrs, &err);
1291 if (x == NULL)
1292 goto out_noput;
1293
1294 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1295 if (IS_ERR(resp_skb)) {
1296 err = PTR_ERR(resp_skb);
1297 } else {
1298 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1299 }
1300 xfrm_state_put(x);
1301out_noput:
1302 return err;
1303}
1304
1305static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1306 struct nlattr **attrs)
1307{
1308 struct net *net = sock_net(skb->sk);
1309 struct xfrm_state *x;
1310 struct xfrm_userspi_info *p;
1311 struct sk_buff *resp_skb;
1312 xfrm_address_t *daddr;
1313 int family;
1314 int err;
1315 u32 mark;
1316 struct xfrm_mark m;
1317 u32 if_id = 0;
1318
1319 p = nlmsg_data(nlh);
1320 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1321 if (err)
1322 goto out_noput;
1323
1324 family = p->info.family;
1325 daddr = &p->info.id.daddr;
1326
1327 x = NULL;
1328
1329 mark = xfrm_mark_get(attrs, &m);
1330
1331 if (attrs[XFRMA_IF_ID])
1332 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1333
1334 if (p->info.seq) {
1335 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1336 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1337 xfrm_state_put(x);
1338 x = NULL;
1339 }
1340 }
1341
1342 if (!x)
1343 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1344 if_id, p->info.id.proto, daddr,
1345 &p->info.saddr, 1,
1346 family);
1347 err = -ENOENT;
1348 if (x == NULL)
1349 goto out_noput;
1350
1351 err = xfrm_alloc_spi(x, p->min, p->max);
1352 if (err)
1353 goto out;
1354
1355 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1356 if (IS_ERR(resp_skb)) {
1357 err = PTR_ERR(resp_skb);
1358 goto out;
1359 }
1360
1361 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1362
1363out:
1364 xfrm_state_put(x);
1365out_noput:
1366 return err;
1367}
1368
1369static int verify_policy_dir(u8 dir)
1370{
1371 switch (dir) {
1372 case XFRM_POLICY_IN:
1373 case XFRM_POLICY_OUT:
1374 case XFRM_POLICY_FWD:
1375 break;
1376
1377 default:
1378 return -EINVAL;
1379 }
1380
1381 return 0;
1382}
1383
1384static int verify_policy_type(u8 type)
1385{
1386 switch (type) {
1387 case XFRM_POLICY_TYPE_MAIN:
1388#ifdef CONFIG_XFRM_SUB_POLICY
1389 case XFRM_POLICY_TYPE_SUB:
1390#endif
1391 break;
1392
1393 default:
1394 return -EINVAL;
1395 }
1396
1397 return 0;
1398}
1399
1400static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1401{
1402 int ret;
1403
1404 switch (p->share) {
1405 case XFRM_SHARE_ANY:
1406 case XFRM_SHARE_SESSION:
1407 case XFRM_SHARE_USER:
1408 case XFRM_SHARE_UNIQUE:
1409 break;
1410
1411 default:
1412 return -EINVAL;
1413 }
1414
1415 switch (p->action) {
1416 case XFRM_POLICY_ALLOW:
1417 case XFRM_POLICY_BLOCK:
1418 break;
1419
1420 default:
1421 return -EINVAL;
1422 }
1423
1424 switch (p->sel.family) {
1425 case AF_INET:
1426 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1427 return -EINVAL;
1428
1429 break;
1430
1431 case AF_INET6:
1432#if IS_ENABLED(CONFIG_IPV6)
1433 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1434 return -EINVAL;
1435
1436 break;
1437#else
1438 return -EAFNOSUPPORT;
1439#endif
1440
1441 default:
1442 return -EINVAL;
1443 }
1444
1445 ret = verify_policy_dir(p->dir);
1446 if (ret)
1447 return ret;
1448 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1449 return -EINVAL;
1450
1451 return 0;
1452}
1453
1454static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1455{
1456 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1457 struct xfrm_user_sec_ctx *uctx;
1458
1459 if (!rt)
1460 return 0;
1461
1462 uctx = nla_data(rt);
1463 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1464}
1465
1466static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1467 int nr)
1468{
1469 int i;
1470
1471 xp->xfrm_nr = nr;
1472 for (i = 0; i < nr; i++, ut++) {
1473 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1474
1475 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1476 memcpy(&t->saddr, &ut->saddr,
1477 sizeof(xfrm_address_t));
1478 t->reqid = ut->reqid;
1479 t->mode = ut->mode;
1480 t->share = ut->share;
1481 t->optional = ut->optional;
1482 t->aalgos = ut->aalgos;
1483 t->ealgos = ut->ealgos;
1484 t->calgos = ut->calgos;
1485 /* If all masks are ~0, then we allow all algorithms. */
1486 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1487 t->encap_family = ut->family;
1488 }
1489}
1490
1491static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1492{
1493 u16 prev_family;
1494 int i;
1495
1496 if (nr > XFRM_MAX_DEPTH)
1497 return -EINVAL;
1498
1499 prev_family = family;
1500
1501 for (i = 0; i < nr; i++) {
1502 /* We never validated the ut->family value, so many
1503 * applications simply leave it at zero. The check was
1504 * never made and ut->family was ignored because all
1505 * templates could be assumed to have the same family as
1506 * the policy itself. Now that we will have ipv4-in-ipv6
1507 * and ipv6-in-ipv4 tunnels, this is no longer true.
1508 */
1509 if (!ut[i].family)
1510 ut[i].family = family;
1511
1512 switch (ut[i].mode) {
1513 case XFRM_MODE_TUNNEL:
1514 case XFRM_MODE_BEET:
1515 break;
1516 default:
1517 if (ut[i].family != prev_family)
1518 return -EINVAL;
1519 break;
1520 }
1521 if (ut[i].mode >= XFRM_MODE_MAX)
1522 return -EINVAL;
1523
1524 prev_family = ut[i].family;
1525
1526 switch (ut[i].family) {
1527 case AF_INET:
1528 break;
1529#if IS_ENABLED(CONFIG_IPV6)
1530 case AF_INET6:
1531 break;
1532#endif
1533 default:
1534 return -EINVAL;
1535 }
1536
1537 if (!xfrm_id_proto_valid(ut[i].id.proto))
1538 return -EINVAL;
1539 }
1540
1541 return 0;
1542}
1543
1544static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1545{
1546 struct nlattr *rt = attrs[XFRMA_TMPL];
1547
1548 if (!rt) {
1549 pol->xfrm_nr = 0;
1550 } else {
1551 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1552 int nr = nla_len(rt) / sizeof(*utmpl);
1553 int err;
1554
1555 err = validate_tmpl(nr, utmpl, pol->family);
1556 if (err)
1557 return err;
1558
1559 copy_templates(pol, utmpl, nr);
1560 }
1561 return 0;
1562}
1563
1564static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1565{
1566 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1567 struct xfrm_userpolicy_type *upt;
1568 u8 type = XFRM_POLICY_TYPE_MAIN;
1569 int err;
1570
1571 if (rt) {
1572 upt = nla_data(rt);
1573 type = upt->type;
1574 }
1575
1576 err = verify_policy_type(type);
1577 if (err)
1578 return err;
1579
1580 *tp = type;
1581 return 0;
1582}
1583
1584static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1585{
1586 xp->priority = p->priority;
1587 xp->index = p->index;
1588 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1589 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1590 xp->action = p->action;
1591 xp->flags = p->flags;
1592 xp->family = p->sel.family;
1593 /* XXX xp->share = p->share; */
1594}
1595
1596static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1597{
1598 memset(p, 0, sizeof(*p));
1599 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1600 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1601 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1602 p->priority = xp->priority;
1603 p->index = xp->index;
1604 p->sel.family = xp->family;
1605 p->dir = dir;
1606 p->action = xp->action;
1607 p->flags = xp->flags;
1608 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1609}
1610
1611static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1612{
1613 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1614 int err;
1615
1616 if (!xp) {
1617 *errp = -ENOMEM;
1618 return NULL;
1619 }
1620
1621 copy_from_user_policy(xp, p);
1622
1623 err = copy_from_user_policy_type(&xp->type, attrs);
1624 if (err)
1625 goto error;
1626
1627 if (!(err = copy_from_user_tmpl(xp, attrs)))
1628 err = copy_from_user_sec_ctx(xp, attrs);
1629 if (err)
1630 goto error;
1631
1632 xfrm_mark_get(attrs, &xp->mark);
1633
1634 if (attrs[XFRMA_IF_ID])
1635 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1636
1637 return xp;
1638 error:
1639 *errp = err;
1640 xp->walk.dead = 1;
1641 xfrm_policy_destroy(xp);
1642 return NULL;
1643}
1644
1645static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1646 struct nlattr **attrs)
1647{
1648 struct net *net = sock_net(skb->sk);
1649 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1650 struct xfrm_policy *xp;
1651 struct km_event c;
1652 int err;
1653 int excl;
1654
1655 err = verify_newpolicy_info(p);
1656 if (err)
1657 return err;
1658 err = verify_sec_ctx_len(attrs);
1659 if (err)
1660 return err;
1661
1662 xp = xfrm_policy_construct(net, p, attrs, &err);
1663 if (!xp)
1664 return err;
1665
1666 /* shouldn't excl be based on nlh flags??
1667 * Aha! this is anti-netlink really i.e more pfkey derived
1668 * in netlink excl is a flag and you wouldnt need
1669 * a type XFRM_MSG_UPDPOLICY - JHS */
1670 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1671 err = xfrm_policy_insert(p->dir, xp, excl);
1672 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1673
1674 if (err) {
1675 security_xfrm_policy_free(xp->security);
1676 kfree(xp);
1677 return err;
1678 }
1679
1680 c.event = nlh->nlmsg_type;
1681 c.seq = nlh->nlmsg_seq;
1682 c.portid = nlh->nlmsg_pid;
1683 km_policy_notify(xp, p->dir, &c);
1684
1685 xfrm_pol_put(xp);
1686
1687 return 0;
1688}
1689
1690static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1691{
1692 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1693 int i;
1694
1695 if (xp->xfrm_nr == 0)
1696 return 0;
1697
1698 for (i = 0; i < xp->xfrm_nr; i++) {
1699 struct xfrm_user_tmpl *up = &vec[i];
1700 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1701
1702 memset(up, 0, sizeof(*up));
1703 memcpy(&up->id, &kp->id, sizeof(up->id));
1704 up->family = kp->encap_family;
1705 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1706 up->reqid = kp->reqid;
1707 up->mode = kp->mode;
1708 up->share = kp->share;
1709 up->optional = kp->optional;
1710 up->aalgos = kp->aalgos;
1711 up->ealgos = kp->ealgos;
1712 up->calgos = kp->calgos;
1713 }
1714
1715 return nla_put(skb, XFRMA_TMPL,
1716 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1717}
1718
1719static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1720{
1721 if (x->security) {
1722 return copy_sec_ctx(x->security, skb);
1723 }
1724 return 0;
1725}
1726
1727static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1728{
1729 if (xp->security)
1730 return copy_sec_ctx(xp->security, skb);
1731 return 0;
1732}
1733static inline unsigned int userpolicy_type_attrsize(void)
1734{
1735#ifdef CONFIG_XFRM_SUB_POLICY
1736 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1737#else
1738 return 0;
1739#endif
1740}
1741
1742#ifdef CONFIG_XFRM_SUB_POLICY
1743static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1744{
1745 struct xfrm_userpolicy_type upt;
1746
1747 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1748 memset(&upt, 0, sizeof(upt));
1749 upt.type = type;
1750
1751 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1752}
1753
1754#else
1755static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1756{
1757 return 0;
1758}
1759#endif
1760
1761static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1762{
1763 struct xfrm_dump_info *sp = ptr;
1764 struct xfrm_userpolicy_info *p;
1765 struct sk_buff *in_skb = sp->in_skb;
1766 struct sk_buff *skb = sp->out_skb;
1767 struct nlmsghdr *nlh;
1768 int err;
1769
1770 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1771 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1772 if (nlh == NULL)
1773 return -EMSGSIZE;
1774
1775 p = nlmsg_data(nlh);
1776 copy_to_user_policy(xp, p, dir);
1777 err = copy_to_user_tmpl(xp, skb);
1778 if (!err)
1779 err = copy_to_user_sec_ctx(xp, skb);
1780 if (!err)
1781 err = copy_to_user_policy_type(xp->type, skb);
1782 if (!err)
1783 err = xfrm_mark_put(skb, &xp->mark);
1784 if (!err)
1785 err = xfrm_if_id_put(skb, xp->if_id);
1786 if (err) {
1787 nlmsg_cancel(skb, nlh);
1788 return err;
1789 }
1790 nlmsg_end(skb, nlh);
1791 return 0;
1792}
1793
1794static int xfrm_dump_policy_done(struct netlink_callback *cb)
1795{
1796 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1797 struct net *net = sock_net(cb->skb->sk);
1798
1799 xfrm_policy_walk_done(walk, net);
1800 return 0;
1801}
1802
1803static int xfrm_dump_policy_start(struct netlink_callback *cb)
1804{
1805 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1806
1807 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1808
1809 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1810 return 0;
1811}
1812
1813static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1814{
1815 struct net *net = sock_net(skb->sk);
1816 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1817 struct xfrm_dump_info info;
1818
1819 info.in_skb = cb->skb;
1820 info.out_skb = skb;
1821 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1822 info.nlmsg_flags = NLM_F_MULTI;
1823
1824 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1825
1826 return skb->len;
1827}
1828
1829static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1830 struct xfrm_policy *xp,
1831 int dir, u32 seq)
1832{
1833 struct xfrm_dump_info info;
1834 struct sk_buff *skb;
1835 int err;
1836
1837 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1838 if (!skb)
1839 return ERR_PTR(-ENOMEM);
1840
1841 info.in_skb = in_skb;
1842 info.out_skb = skb;
1843 info.nlmsg_seq = seq;
1844 info.nlmsg_flags = 0;
1845
1846 err = dump_one_policy(xp, dir, 0, &info);
1847 if (err) {
1848 kfree_skb(skb);
1849 return ERR_PTR(err);
1850 }
1851
1852 return skb;
1853}
1854
1855static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1856 struct nlattr **attrs)
1857{
1858 struct net *net = sock_net(skb->sk);
1859 struct xfrm_policy *xp;
1860 struct xfrm_userpolicy_id *p;
1861 u8 type = XFRM_POLICY_TYPE_MAIN;
1862 int err;
1863 struct km_event c;
1864 int delete;
1865 struct xfrm_mark m;
1866 u32 if_id = 0;
1867
1868 p = nlmsg_data(nlh);
1869 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1870
1871 err = copy_from_user_policy_type(&type, attrs);
1872 if (err)
1873 return err;
1874
1875 err = verify_policy_dir(p->dir);
1876 if (err)
1877 return err;
1878
1879 if (attrs[XFRMA_IF_ID])
1880 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1881
1882 xfrm_mark_get(attrs, &m);
1883
1884 if (p->index)
1885 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
1886 p->index, delete, &err);
1887 else {
1888 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1889 struct xfrm_sec_ctx *ctx;
1890
1891 err = verify_sec_ctx_len(attrs);
1892 if (err)
1893 return err;
1894
1895 ctx = NULL;
1896 if (rt) {
1897 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1898
1899 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1900 if (err)
1901 return err;
1902 }
1903 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
1904 &p->sel, ctx, delete, &err);
1905 security_xfrm_policy_free(ctx);
1906 }
1907 if (xp == NULL)
1908 return -ENOENT;
1909
1910 if (!delete) {
1911 struct sk_buff *resp_skb;
1912
1913 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1914 if (IS_ERR(resp_skb)) {
1915 err = PTR_ERR(resp_skb);
1916 } else {
1917 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1918 NETLINK_CB(skb).portid);
1919 }
1920 } else {
1921 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1922
1923 if (err != 0)
1924 goto out;
1925
1926 c.data.byid = p->index;
1927 c.event = nlh->nlmsg_type;
1928 c.seq = nlh->nlmsg_seq;
1929 c.portid = nlh->nlmsg_pid;
1930 km_policy_notify(xp, p->dir, &c);
1931 }
1932
1933out:
1934 xfrm_pol_put(xp);
1935 return err;
1936}
1937
1938static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1939 struct nlattr **attrs)
1940{
1941 struct net *net = sock_net(skb->sk);
1942 struct km_event c;
1943 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1944 int err;
1945
1946 err = xfrm_state_flush(net, p->proto, true, false);
1947 if (err) {
1948 if (err == -ESRCH) /* empty table */
1949 return 0;
1950 return err;
1951 }
1952 c.data.proto = p->proto;
1953 c.event = nlh->nlmsg_type;
1954 c.seq = nlh->nlmsg_seq;
1955 c.portid = nlh->nlmsg_pid;
1956 c.net = net;
1957 km_state_notify(NULL, &c);
1958
1959 return 0;
1960}
1961
1962static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1963{
1964 unsigned int replay_size = x->replay_esn ?
1965 xfrm_replay_state_esn_len(x->replay_esn) :
1966 sizeof(struct xfrm_replay_state);
1967
1968 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1969 + nla_total_size(replay_size)
1970 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1971 + nla_total_size(sizeof(struct xfrm_mark))
1972 + nla_total_size(4) /* XFRM_AE_RTHR */
1973 + nla_total_size(4); /* XFRM_AE_ETHR */
1974}
1975
1976static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1977{
1978 struct xfrm_aevent_id *id;
1979 struct nlmsghdr *nlh;
1980 int err;
1981
1982 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1983 if (nlh == NULL)
1984 return -EMSGSIZE;
1985
1986 id = nlmsg_data(nlh);
1987 memset(&id->sa_id, 0, sizeof(id->sa_id));
1988 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1989 id->sa_id.spi = x->id.spi;
1990 id->sa_id.family = x->props.family;
1991 id->sa_id.proto = x->id.proto;
1992 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1993 id->reqid = x->props.reqid;
1994 id->flags = c->data.aevent;
1995
1996 if (x->replay_esn) {
1997 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1998 xfrm_replay_state_esn_len(x->replay_esn),
1999 x->replay_esn);
2000 } else {
2001 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2002 &x->replay);
2003 }
2004 if (err)
2005 goto out_cancel;
2006 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2007 XFRMA_PAD);
2008 if (err)
2009 goto out_cancel;
2010
2011 if (id->flags & XFRM_AE_RTHR) {
2012 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2013 if (err)
2014 goto out_cancel;
2015 }
2016 if (id->flags & XFRM_AE_ETHR) {
2017 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2018 x->replay_maxage * 10 / HZ);
2019 if (err)
2020 goto out_cancel;
2021 }
2022 err = xfrm_mark_put(skb, &x->mark);
2023 if (err)
2024 goto out_cancel;
2025
2026 err = xfrm_if_id_put(skb, x->if_id);
2027 if (err)
2028 goto out_cancel;
2029
2030 nlmsg_end(skb, nlh);
2031 return 0;
2032
2033out_cancel:
2034 nlmsg_cancel(skb, nlh);
2035 return err;
2036}
2037
2038static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2039 struct nlattr **attrs)
2040{
2041 struct net *net = sock_net(skb->sk);
2042 struct xfrm_state *x;
2043 struct sk_buff *r_skb;
2044 int err;
2045 struct km_event c;
2046 u32 mark;
2047 struct xfrm_mark m;
2048 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2049 struct xfrm_usersa_id *id = &p->sa_id;
2050
2051 mark = xfrm_mark_get(attrs, &m);
2052
2053 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2054 if (x == NULL)
2055 return -ESRCH;
2056
2057 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2058 if (r_skb == NULL) {
2059 xfrm_state_put(x);
2060 return -ENOMEM;
2061 }
2062
2063 /*
2064 * XXX: is this lock really needed - none of the other
2065 * gets lock (the concern is things getting updated
2066 * while we are still reading) - jhs
2067 */
2068 spin_lock_bh(&x->lock);
2069 c.data.aevent = p->flags;
2070 c.seq = nlh->nlmsg_seq;
2071 c.portid = nlh->nlmsg_pid;
2072
2073 err = build_aevent(r_skb, x, &c);
2074 BUG_ON(err < 0);
2075
2076 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2077 spin_unlock_bh(&x->lock);
2078 xfrm_state_put(x);
2079 return err;
2080}
2081
2082static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2083 struct nlattr **attrs)
2084{
2085 struct net *net = sock_net(skb->sk);
2086 struct xfrm_state *x;
2087 struct km_event c;
2088 int err = -EINVAL;
2089 u32 mark = 0;
2090 struct xfrm_mark m;
2091 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2092 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2093 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2094 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2095 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2096 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2097
2098 if (!lt && !rp && !re && !et && !rt)
2099 return err;
2100
2101 /* pedantic mode - thou shalt sayeth replaceth */
2102 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2103 return err;
2104
2105 mark = xfrm_mark_get(attrs, &m);
2106
2107 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2108 if (x == NULL)
2109 return -ESRCH;
2110
2111 if (x->km.state != XFRM_STATE_VALID)
2112 goto out;
2113
2114 err = xfrm_replay_verify_len(x->replay_esn, re);
2115 if (err)
2116 goto out;
2117
2118 spin_lock_bh(&x->lock);
2119 xfrm_update_ae_params(x, attrs, 1);
2120 spin_unlock_bh(&x->lock);
2121
2122 c.event = nlh->nlmsg_type;
2123 c.seq = nlh->nlmsg_seq;
2124 c.portid = nlh->nlmsg_pid;
2125 c.data.aevent = XFRM_AE_CU;
2126 km_state_notify(x, &c);
2127 err = 0;
2128out:
2129 xfrm_state_put(x);
2130 return err;
2131}
2132
2133static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2134 struct nlattr **attrs)
2135{
2136 struct net *net = sock_net(skb->sk);
2137 struct km_event c;
2138 u8 type = XFRM_POLICY_TYPE_MAIN;
2139 int err;
2140
2141 err = copy_from_user_policy_type(&type, attrs);
2142 if (err)
2143 return err;
2144
2145 err = xfrm_policy_flush(net, type, true);
2146 if (err) {
2147 if (err == -ESRCH) /* empty table */
2148 return 0;
2149 return err;
2150 }
2151
2152 c.data.type = type;
2153 c.event = nlh->nlmsg_type;
2154 c.seq = nlh->nlmsg_seq;
2155 c.portid = nlh->nlmsg_pid;
2156 c.net = net;
2157 km_policy_notify(NULL, 0, &c);
2158 return 0;
2159}
2160
2161static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2162 struct nlattr **attrs)
2163{
2164 struct net *net = sock_net(skb->sk);
2165 struct xfrm_policy *xp;
2166 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2167 struct xfrm_userpolicy_info *p = &up->pol;
2168 u8 type = XFRM_POLICY_TYPE_MAIN;
2169 int err = -ENOENT;
2170 struct xfrm_mark m;
2171 u32 if_id = 0;
2172
2173 err = copy_from_user_policy_type(&type, attrs);
2174 if (err)
2175 return err;
2176
2177 err = verify_policy_dir(p->dir);
2178 if (err)
2179 return err;
2180
2181 if (attrs[XFRMA_IF_ID])
2182 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2183
2184 xfrm_mark_get(attrs, &m);
2185
2186 if (p->index)
2187 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2188 0, &err);
2189 else {
2190 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2191 struct xfrm_sec_ctx *ctx;
2192
2193 err = verify_sec_ctx_len(attrs);
2194 if (err)
2195 return err;
2196
2197 ctx = NULL;
2198 if (rt) {
2199 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2200
2201 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2202 if (err)
2203 return err;
2204 }
2205 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2206 &p->sel, ctx, 0, &err);
2207 security_xfrm_policy_free(ctx);
2208 }
2209 if (xp == NULL)
2210 return -ENOENT;
2211
2212 if (unlikely(xp->walk.dead))
2213 goto out;
2214
2215 err = 0;
2216 if (up->hard) {
2217 xfrm_policy_delete(xp, p->dir);
2218 xfrm_audit_policy_delete(xp, 1, true);
2219 }
2220 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2221
2222out:
2223 xfrm_pol_put(xp);
2224 return err;
2225}
2226
2227static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2228 struct nlattr **attrs)
2229{
2230 struct net *net = sock_net(skb->sk);
2231 struct xfrm_state *x;
2232 int err;
2233 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2234 struct xfrm_usersa_info *p = &ue->state;
2235 struct xfrm_mark m;
2236 u32 mark = xfrm_mark_get(attrs, &m);
2237
2238 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2239
2240 err = -ENOENT;
2241 if (x == NULL)
2242 return err;
2243
2244 spin_lock_bh(&x->lock);
2245 err = -EINVAL;
2246 if (x->km.state != XFRM_STATE_VALID)
2247 goto out;
2248 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2249
2250 if (ue->hard) {
2251 __xfrm_state_delete(x);
2252 xfrm_audit_state_delete(x, 1, true);
2253 }
2254 err = 0;
2255out:
2256 spin_unlock_bh(&x->lock);
2257 xfrm_state_put(x);
2258 return err;
2259}
2260
2261static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2262 struct nlattr **attrs)
2263{
2264 struct net *net = sock_net(skb->sk);
2265 struct xfrm_policy *xp;
2266 struct xfrm_user_tmpl *ut;
2267 int i;
2268 struct nlattr *rt = attrs[XFRMA_TMPL];
2269 struct xfrm_mark mark;
2270
2271 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2272 struct xfrm_state *x = xfrm_state_alloc(net);
2273 int err = -ENOMEM;
2274
2275 if (!x)
2276 goto nomem;
2277
2278 xfrm_mark_get(attrs, &mark);
2279
2280 err = verify_newpolicy_info(&ua->policy);
2281 if (err)
2282 goto free_state;
2283 err = verify_sec_ctx_len(attrs);
2284 if (err)
2285 goto free_state;
2286
2287 /* build an XP */
2288 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2289 if (!xp)
2290 goto free_state;
2291
2292 memcpy(&x->id, &ua->id, sizeof(ua->id));
2293 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2294 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2295 xp->mark.m = x->mark.m = mark.m;
2296 xp->mark.v = x->mark.v = mark.v;
2297 ut = nla_data(rt);
2298 /* extract the templates and for each call km_key */
2299 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2300 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2301 memcpy(&x->id, &t->id, sizeof(x->id));
2302 x->props.mode = t->mode;
2303 x->props.reqid = t->reqid;
2304 x->props.family = ut->family;
2305 t->aalgos = ua->aalgos;
2306 t->ealgos = ua->ealgos;
2307 t->calgos = ua->calgos;
2308 err = km_query(x, t, xp);
2309
2310 }
2311
2312 xfrm_state_free(x);
2313 kfree(xp);
2314
2315 return 0;
2316
2317free_state:
2318 xfrm_state_free(x);
2319nomem:
2320 return err;
2321}
2322
2323#ifdef CONFIG_XFRM_MIGRATE
2324static int copy_from_user_migrate(struct xfrm_migrate *ma,
2325 struct xfrm_kmaddress *k,
2326 struct nlattr **attrs, int *num)
2327{
2328 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2329 struct xfrm_user_migrate *um;
2330 int i, num_migrate;
2331
2332 if (k != NULL) {
2333 struct xfrm_user_kmaddress *uk;
2334
2335 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2336 memcpy(&k->local, &uk->local, sizeof(k->local));
2337 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2338 k->family = uk->family;
2339 k->reserved = uk->reserved;
2340 }
2341
2342 um = nla_data(rt);
2343 num_migrate = nla_len(rt) / sizeof(*um);
2344
2345 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2346 return -EINVAL;
2347
2348 for (i = 0; i < num_migrate; i++, um++, ma++) {
2349 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2350 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2351 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2352 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2353
2354 ma->proto = um->proto;
2355 ma->mode = um->mode;
2356 ma->reqid = um->reqid;
2357
2358 ma->old_family = um->old_family;
2359 ma->new_family = um->new_family;
2360 }
2361
2362 *num = i;
2363 return 0;
2364}
2365
2366static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2367 struct nlattr **attrs)
2368{
2369 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2370 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2371 struct xfrm_kmaddress km, *kmp;
2372 u8 type;
2373 int err;
2374 int n = 0;
2375 struct net *net = sock_net(skb->sk);
2376 struct xfrm_encap_tmpl *encap = NULL;
2377
2378 if (attrs[XFRMA_MIGRATE] == NULL)
2379 return -EINVAL;
2380
2381 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2382
2383 err = copy_from_user_policy_type(&type, attrs);
2384 if (err)
2385 return err;
2386
2387 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2388 if (err)
2389 return err;
2390
2391 if (!n)
2392 return 0;
2393
2394 if (attrs[XFRMA_ENCAP]) {
2395 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2396 sizeof(*encap), GFP_KERNEL);
2397 if (!encap)
2398 return 0;
2399 }
2400
2401 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2402
2403 kfree(encap);
2404
2405 return err;
2406}
2407#else
2408static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2409 struct nlattr **attrs)
2410{
2411 return -ENOPROTOOPT;
2412}
2413#endif
2414
2415#ifdef CONFIG_XFRM_MIGRATE
2416static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2417{
2418 struct xfrm_user_migrate um;
2419
2420 memset(&um, 0, sizeof(um));
2421 um.proto = m->proto;
2422 um.mode = m->mode;
2423 um.reqid = m->reqid;
2424 um.old_family = m->old_family;
2425 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2426 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2427 um.new_family = m->new_family;
2428 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2429 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2430
2431 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2432}
2433
2434static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2435{
2436 struct xfrm_user_kmaddress uk;
2437
2438 memset(&uk, 0, sizeof(uk));
2439 uk.family = k->family;
2440 uk.reserved = k->reserved;
2441 memcpy(&uk.local, &k->local, sizeof(uk.local));
2442 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2443
2444 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2445}
2446
2447static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2448 int with_encp)
2449{
2450 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2451 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2452 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2453 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2454 + userpolicy_type_attrsize();
2455}
2456
2457static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2458 int num_migrate, const struct xfrm_kmaddress *k,
2459 const struct xfrm_selector *sel,
2460 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2461{
2462 const struct xfrm_migrate *mp;
2463 struct xfrm_userpolicy_id *pol_id;
2464 struct nlmsghdr *nlh;
2465 int i, err;
2466
2467 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2468 if (nlh == NULL)
2469 return -EMSGSIZE;
2470
2471 pol_id = nlmsg_data(nlh);
2472 /* copy data from selector, dir, and type to the pol_id */
2473 memset(pol_id, 0, sizeof(*pol_id));
2474 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2475 pol_id->dir = dir;
2476
2477 if (k != NULL) {
2478 err = copy_to_user_kmaddress(k, skb);
2479 if (err)
2480 goto out_cancel;
2481 }
2482 if (encap) {
2483 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2484 if (err)
2485 goto out_cancel;
2486 }
2487 err = copy_to_user_policy_type(type, skb);
2488 if (err)
2489 goto out_cancel;
2490 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2491 err = copy_to_user_migrate(mp, skb);
2492 if (err)
2493 goto out_cancel;
2494 }
2495
2496 nlmsg_end(skb, nlh);
2497 return 0;
2498
2499out_cancel:
2500 nlmsg_cancel(skb, nlh);
2501 return err;
2502}
2503
2504static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2505 const struct xfrm_migrate *m, int num_migrate,
2506 const struct xfrm_kmaddress *k,
2507 const struct xfrm_encap_tmpl *encap)
2508{
2509 struct net *net = &init_net;
2510 struct sk_buff *skb;
2511 int err;
2512
2513 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2514 GFP_ATOMIC);
2515 if (skb == NULL)
2516 return -ENOMEM;
2517
2518 /* build migrate */
2519 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2520 BUG_ON(err < 0);
2521
2522 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2523}
2524#else
2525static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2526 const struct xfrm_migrate *m, int num_migrate,
2527 const struct xfrm_kmaddress *k,
2528 const struct xfrm_encap_tmpl *encap)
2529{
2530 return -ENOPROTOOPT;
2531}
2532#endif
2533
2534#define XMSGSIZE(type) sizeof(struct type)
2535
2536static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2537 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2538 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2539 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2540 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2541 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2542 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2543 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2544 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2545 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2546 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2547 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2548 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2549 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2550 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2551 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2552 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2553 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2554 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2555 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2556 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2557 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2558};
2559
2560#undef XMSGSIZE
2561
2562static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2563 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2564 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2565 [XFRMA_LASTUSED] = { .type = NLA_U64},
2566 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2567 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2568 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2569 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2570 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2571 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2572 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2573 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2574 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2575 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2576 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2577 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2578 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2579 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2580 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2581 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2582 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2583 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2584 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2585 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2586 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2587 [XFRMA_PROTO] = { .type = NLA_U8 },
2588 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2589 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2590 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2591 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2592 [XFRMA_IF_ID] = { .type = NLA_U32 },
2593};
2594
2595static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2596 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2597 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2598};
2599
2600static const struct xfrm_link {
2601 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2602 int (*start)(struct netlink_callback *);
2603 int (*dump)(struct sk_buff *, struct netlink_callback *);
2604 int (*done)(struct netlink_callback *);
2605 const struct nla_policy *nla_pol;
2606 int nla_max;
2607} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2608 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2609 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2610 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2611 .dump = xfrm_dump_sa,
2612 .done = xfrm_dump_sa_done },
2613 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2614 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2615 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2616 .start = xfrm_dump_policy_start,
2617 .dump = xfrm_dump_policy,
2618 .done = xfrm_dump_policy_done },
2619 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2620 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2621 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2622 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2623 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2624 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2625 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2626 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2627 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2628 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2629 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2630 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2631 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2632 .nla_pol = xfrma_spd_policy,
2633 .nla_max = XFRMA_SPD_MAX },
2634 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2635};
2636
2637static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2638 struct netlink_ext_ack *extack)
2639{
2640 struct net *net = sock_net(skb->sk);
2641 struct nlattr *attrs[XFRMA_MAX+1];
2642 const struct xfrm_link *link;
2643 int type, err;
2644
2645 if (in_compat_syscall())
2646 return -EOPNOTSUPP;
2647
2648 type = nlh->nlmsg_type;
2649 if (type > XFRM_MSG_MAX)
2650 return -EINVAL;
2651
2652 type -= XFRM_MSG_BASE;
2653 link = &xfrm_dispatch[type];
2654
2655 /* All operations require privileges, even GET */
2656 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2657 return -EPERM;
2658
2659 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2660 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2661 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2662 if (link->dump == NULL)
2663 return -EINVAL;
2664
2665 {
2666 struct netlink_dump_control c = {
2667 .start = link->start,
2668 .dump = link->dump,
2669 .done = link->done,
2670 };
2671 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2672 }
2673 }
2674
2675 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2676 link->nla_max ? : XFRMA_MAX,
2677 link->nla_pol ? : xfrma_policy, extack);
2678 if (err < 0)
2679 return err;
2680
2681 if (link->doit == NULL)
2682 return -EINVAL;
2683
2684 return link->doit(skb, nlh, attrs);
2685}
2686
2687static void xfrm_netlink_rcv(struct sk_buff *skb)
2688{
2689 struct net *net = sock_net(skb->sk);
2690
2691 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2692 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2693 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2694}
2695
2696static inline unsigned int xfrm_expire_msgsize(void)
2697{
2698 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2699 + nla_total_size(sizeof(struct xfrm_mark));
2700}
2701
2702static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2703{
2704 struct xfrm_user_expire *ue;
2705 struct nlmsghdr *nlh;
2706 int err;
2707
2708 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2709 if (nlh == NULL)
2710 return -EMSGSIZE;
2711
2712 ue = nlmsg_data(nlh);
2713 copy_to_user_state(x, &ue->state);
2714 ue->hard = (c->data.hard != 0) ? 1 : 0;
2715 /* clear the padding bytes */
2716 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2717
2718 err = xfrm_mark_put(skb, &x->mark);
2719 if (err)
2720 return err;
2721
2722 err = xfrm_if_id_put(skb, x->if_id);
2723 if (err)
2724 return err;
2725
2726 nlmsg_end(skb, nlh);
2727 return 0;
2728}
2729
2730static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2731{
2732 struct net *net = xs_net(x);
2733 struct sk_buff *skb;
2734
2735 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2736 if (skb == NULL)
2737 return -ENOMEM;
2738
2739 if (build_expire(skb, x, c) < 0) {
2740 kfree_skb(skb);
2741 return -EMSGSIZE;
2742 }
2743
2744 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2745}
2746
2747static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2748{
2749 struct net *net = xs_net(x);
2750 struct sk_buff *skb;
2751 int err;
2752
2753 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2754 if (skb == NULL)
2755 return -ENOMEM;
2756
2757 err = build_aevent(skb, x, c);
2758 BUG_ON(err < 0);
2759
2760 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2761}
2762
2763static int xfrm_notify_sa_flush(const struct km_event *c)
2764{
2765 struct net *net = c->net;
2766 struct xfrm_usersa_flush *p;
2767 struct nlmsghdr *nlh;
2768 struct sk_buff *skb;
2769 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2770
2771 skb = nlmsg_new(len, GFP_ATOMIC);
2772 if (skb == NULL)
2773 return -ENOMEM;
2774
2775 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2776 if (nlh == NULL) {
2777 kfree_skb(skb);
2778 return -EMSGSIZE;
2779 }
2780
2781 p = nlmsg_data(nlh);
2782 p->proto = c->data.proto;
2783
2784 nlmsg_end(skb, nlh);
2785
2786 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2787}
2788
2789static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2790{
2791 unsigned int l = 0;
2792 if (x->aead)
2793 l += nla_total_size(aead_len(x->aead));
2794 if (x->aalg) {
2795 l += nla_total_size(sizeof(struct xfrm_algo) +
2796 (x->aalg->alg_key_len + 7) / 8);
2797 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2798 }
2799 if (x->ealg)
2800 l += nla_total_size(xfrm_alg_len(x->ealg));
2801 if (x->calg)
2802 l += nla_total_size(sizeof(*x->calg));
2803 if (x->encap)
2804 l += nla_total_size(sizeof(*x->encap));
2805 if (x->tfcpad)
2806 l += nla_total_size(sizeof(x->tfcpad));
2807 if (x->replay_esn)
2808 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2809 else
2810 l += nla_total_size(sizeof(struct xfrm_replay_state));
2811 if (x->security)
2812 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2813 x->security->ctx_len);
2814 if (x->coaddr)
2815 l += nla_total_size(sizeof(*x->coaddr));
2816 if (x->props.extra_flags)
2817 l += nla_total_size(sizeof(x->props.extra_flags));
2818 if (x->xso.dev)
2819 l += nla_total_size(sizeof(x->xso));
2820 if (x->props.smark.v | x->props.smark.m) {
2821 l += nla_total_size(sizeof(x->props.smark.v));
2822 l += nla_total_size(sizeof(x->props.smark.m));
2823 }
2824 if (x->if_id)
2825 l += nla_total_size(sizeof(x->if_id));
2826
2827 /* Must count x->lastused as it may become non-zero behind our back. */
2828 l += nla_total_size_64bit(sizeof(u64));
2829
2830 return l;
2831}
2832
2833static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2834{
2835 struct net *net = xs_net(x);
2836 struct xfrm_usersa_info *p;
2837 struct xfrm_usersa_id *id;
2838 struct nlmsghdr *nlh;
2839 struct sk_buff *skb;
2840 unsigned int len = xfrm_sa_len(x);
2841 unsigned int headlen;
2842 int err;
2843
2844 headlen = sizeof(*p);
2845 if (c->event == XFRM_MSG_DELSA) {
2846 len += nla_total_size(headlen);
2847 headlen = sizeof(*id);
2848 len += nla_total_size(sizeof(struct xfrm_mark));
2849 }
2850 len += NLMSG_ALIGN(headlen);
2851
2852 skb = nlmsg_new(len, GFP_ATOMIC);
2853 if (skb == NULL)
2854 return -ENOMEM;
2855
2856 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2857 err = -EMSGSIZE;
2858 if (nlh == NULL)
2859 goto out_free_skb;
2860
2861 p = nlmsg_data(nlh);
2862 if (c->event == XFRM_MSG_DELSA) {
2863 struct nlattr *attr;
2864
2865 id = nlmsg_data(nlh);
2866 memset(id, 0, sizeof(*id));
2867 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2868 id->spi = x->id.spi;
2869 id->family = x->props.family;
2870 id->proto = x->id.proto;
2871
2872 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2873 err = -EMSGSIZE;
2874 if (attr == NULL)
2875 goto out_free_skb;
2876
2877 p = nla_data(attr);
2878 }
2879 err = copy_to_user_state_extra(x, p, skb);
2880 if (err)
2881 goto out_free_skb;
2882
2883 nlmsg_end(skb, nlh);
2884
2885 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2886
2887out_free_skb:
2888 kfree_skb(skb);
2889 return err;
2890}
2891
2892static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2893{
2894
2895 switch (c->event) {
2896 case XFRM_MSG_EXPIRE:
2897 return xfrm_exp_state_notify(x, c);
2898 case XFRM_MSG_NEWAE:
2899 return xfrm_aevent_state_notify(x, c);
2900 case XFRM_MSG_DELSA:
2901 case XFRM_MSG_UPDSA:
2902 case XFRM_MSG_NEWSA:
2903 return xfrm_notify_sa(x, c);
2904 case XFRM_MSG_FLUSHSA:
2905 return xfrm_notify_sa_flush(c);
2906 default:
2907 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2908 c->event);
2909 break;
2910 }
2911
2912 return 0;
2913
2914}
2915
2916static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2917 struct xfrm_policy *xp)
2918{
2919 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2920 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2921 + nla_total_size(sizeof(struct xfrm_mark))
2922 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2923 + userpolicy_type_attrsize();
2924}
2925
2926static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2927 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2928{
2929 __u32 seq = xfrm_get_acqseq();
2930 struct xfrm_user_acquire *ua;
2931 struct nlmsghdr *nlh;
2932 int err;
2933
2934 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2935 if (nlh == NULL)
2936 return -EMSGSIZE;
2937
2938 ua = nlmsg_data(nlh);
2939 memcpy(&ua->id, &x->id, sizeof(ua->id));
2940 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2941 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2942 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2943 ua->aalgos = xt->aalgos;
2944 ua->ealgos = xt->ealgos;
2945 ua->calgos = xt->calgos;
2946 ua->seq = x->km.seq = seq;
2947
2948 err = copy_to_user_tmpl(xp, skb);
2949 if (!err)
2950 err = copy_to_user_state_sec_ctx(x, skb);
2951 if (!err)
2952 err = copy_to_user_policy_type(xp->type, skb);
2953 if (!err)
2954 err = xfrm_mark_put(skb, &xp->mark);
2955 if (!err)
2956 err = xfrm_if_id_put(skb, xp->if_id);
2957 if (err) {
2958 nlmsg_cancel(skb, nlh);
2959 return err;
2960 }
2961
2962 nlmsg_end(skb, nlh);
2963 return 0;
2964}
2965
2966static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2967 struct xfrm_policy *xp)
2968{
2969 struct net *net = xs_net(x);
2970 struct sk_buff *skb;
2971 int err;
2972
2973 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2974 if (skb == NULL)
2975 return -ENOMEM;
2976
2977 err = build_acquire(skb, x, xt, xp);
2978 BUG_ON(err < 0);
2979
2980 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2981}
2982
2983/* User gives us xfrm_user_policy_info followed by an array of 0
2984 * or more templates.
2985 */
2986static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2987 u8 *data, int len, int *dir)
2988{
2989 struct net *net = sock_net(sk);
2990 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2991 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2992 struct xfrm_policy *xp;
2993 int nr;
2994
2995 switch (sk->sk_family) {
2996 case AF_INET:
2997 if (opt != IP_XFRM_POLICY) {
2998 *dir = -EOPNOTSUPP;
2999 return NULL;
3000 }
3001 break;
3002#if IS_ENABLED(CONFIG_IPV6)
3003 case AF_INET6:
3004 if (opt != IPV6_XFRM_POLICY) {
3005 *dir = -EOPNOTSUPP;
3006 return NULL;
3007 }
3008 break;
3009#endif
3010 default:
3011 *dir = -EINVAL;
3012 return NULL;
3013 }
3014
3015 *dir = -EINVAL;
3016
3017 if (len < sizeof(*p) ||
3018 verify_newpolicy_info(p))
3019 return NULL;
3020
3021 nr = ((len - sizeof(*p)) / sizeof(*ut));
3022 if (validate_tmpl(nr, ut, p->sel.family))
3023 return NULL;
3024
3025 if (p->dir > XFRM_POLICY_OUT)
3026 return NULL;
3027
3028 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3029 if (xp == NULL) {
3030 *dir = -ENOBUFS;
3031 return NULL;
3032 }
3033
3034 copy_from_user_policy(xp, p);
3035 xp->type = XFRM_POLICY_TYPE_MAIN;
3036 copy_templates(xp, ut, nr);
3037
3038 *dir = p->dir;
3039
3040 return xp;
3041}
3042
3043static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3044{
3045 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3046 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3047 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3048 + nla_total_size(sizeof(struct xfrm_mark))
3049 + userpolicy_type_attrsize();
3050}
3051
3052static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3053 int dir, const struct km_event *c)
3054{
3055 struct xfrm_user_polexpire *upe;
3056 int hard = c->data.hard;
3057 struct nlmsghdr *nlh;
3058 int err;
3059
3060 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3061 if (nlh == NULL)
3062 return -EMSGSIZE;
3063
3064 upe = nlmsg_data(nlh);
3065 copy_to_user_policy(xp, &upe->pol, dir);
3066 err = copy_to_user_tmpl(xp, skb);
3067 if (!err)
3068 err = copy_to_user_sec_ctx(xp, skb);
3069 if (!err)
3070 err = copy_to_user_policy_type(xp->type, skb);
3071 if (!err)
3072 err = xfrm_mark_put(skb, &xp->mark);
3073 if (!err)
3074 err = xfrm_if_id_put(skb, xp->if_id);
3075 if (err) {
3076 nlmsg_cancel(skb, nlh);
3077 return err;
3078 }
3079 upe->hard = !!hard;
3080
3081 nlmsg_end(skb, nlh);
3082 return 0;
3083}
3084
3085static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3086{
3087 struct net *net = xp_net(xp);
3088 struct sk_buff *skb;
3089 int err;
3090
3091 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3092 if (skb == NULL)
3093 return -ENOMEM;
3094
3095 err = build_polexpire(skb, xp, dir, c);
3096 BUG_ON(err < 0);
3097
3098 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3099}
3100
3101static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3102{
3103 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3104 struct net *net = xp_net(xp);
3105 struct xfrm_userpolicy_info *p;
3106 struct xfrm_userpolicy_id *id;
3107 struct nlmsghdr *nlh;
3108 struct sk_buff *skb;
3109 unsigned int headlen;
3110 int err;
3111
3112 headlen = sizeof(*p);
3113 if (c->event == XFRM_MSG_DELPOLICY) {
3114 len += nla_total_size(headlen);
3115 headlen = sizeof(*id);
3116 }
3117 len += userpolicy_type_attrsize();
3118 len += nla_total_size(sizeof(struct xfrm_mark));
3119 len += NLMSG_ALIGN(headlen);
3120
3121 skb = nlmsg_new(len, GFP_ATOMIC);
3122 if (skb == NULL)
3123 return -ENOMEM;
3124
3125 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3126 err = -EMSGSIZE;
3127 if (nlh == NULL)
3128 goto out_free_skb;
3129
3130 p = nlmsg_data(nlh);
3131 if (c->event == XFRM_MSG_DELPOLICY) {
3132 struct nlattr *attr;
3133
3134 id = nlmsg_data(nlh);
3135 memset(id, 0, sizeof(*id));
3136 id->dir = dir;
3137 if (c->data.byid)
3138 id->index = xp->index;
3139 else
3140 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3141
3142 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3143 err = -EMSGSIZE;
3144 if (attr == NULL)
3145 goto out_free_skb;
3146
3147 p = nla_data(attr);
3148 }
3149
3150 copy_to_user_policy(xp, p, dir);
3151 err = copy_to_user_tmpl(xp, skb);
3152 if (!err)
3153 err = copy_to_user_policy_type(xp->type, skb);
3154 if (!err)
3155 err = xfrm_mark_put(skb, &xp->mark);
3156 if (!err)
3157 err = xfrm_if_id_put(skb, xp->if_id);
3158 if (err)
3159 goto out_free_skb;
3160
3161 nlmsg_end(skb, nlh);
3162
3163 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3164
3165out_free_skb:
3166 kfree_skb(skb);
3167 return err;
3168}
3169
3170static int xfrm_notify_policy_flush(const struct km_event *c)
3171{
3172 struct net *net = c->net;
3173 struct nlmsghdr *nlh;
3174 struct sk_buff *skb;
3175 int err;
3176
3177 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3178 if (skb == NULL)
3179 return -ENOMEM;
3180
3181 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3182 err = -EMSGSIZE;
3183 if (nlh == NULL)
3184 goto out_free_skb;
3185 err = copy_to_user_policy_type(c->data.type, skb);
3186 if (err)
3187 goto out_free_skb;
3188
3189 nlmsg_end(skb, nlh);
3190
3191 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3192
3193out_free_skb:
3194 kfree_skb(skb);
3195 return err;
3196}
3197
3198static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3199{
3200
3201 switch (c->event) {
3202 case XFRM_MSG_NEWPOLICY:
3203 case XFRM_MSG_UPDPOLICY:
3204 case XFRM_MSG_DELPOLICY:
3205 return xfrm_notify_policy(xp, dir, c);
3206 case XFRM_MSG_FLUSHPOLICY:
3207 return xfrm_notify_policy_flush(c);
3208 case XFRM_MSG_POLEXPIRE:
3209 return xfrm_exp_policy_notify(xp, dir, c);
3210 default:
3211 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3212 c->event);
3213 }
3214
3215 return 0;
3216
3217}
3218
3219static inline unsigned int xfrm_report_msgsize(void)
3220{
3221 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3222}
3223
3224static int build_report(struct sk_buff *skb, u8 proto,
3225 struct xfrm_selector *sel, xfrm_address_t *addr)
3226{
3227 struct xfrm_user_report *ur;
3228 struct nlmsghdr *nlh;
3229
3230 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3231 if (nlh == NULL)
3232 return -EMSGSIZE;
3233
3234 ur = nlmsg_data(nlh);
3235 ur->proto = proto;
3236 memcpy(&ur->sel, sel, sizeof(ur->sel));
3237
3238 if (addr) {
3239 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3240 if (err) {
3241 nlmsg_cancel(skb, nlh);
3242 return err;
3243 }
3244 }
3245 nlmsg_end(skb, nlh);
3246 return 0;
3247}
3248
3249static int xfrm_send_report(struct net *net, u8 proto,
3250 struct xfrm_selector *sel, xfrm_address_t *addr)
3251{
3252 struct sk_buff *skb;
3253 int err;
3254
3255 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3256 if (skb == NULL)
3257 return -ENOMEM;
3258
3259 err = build_report(skb, proto, sel, addr);
3260 BUG_ON(err < 0);
3261
3262 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3263}
3264
3265static inline unsigned int xfrm_mapping_msgsize(void)
3266{
3267 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3268}
3269
3270static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3271 xfrm_address_t *new_saddr, __be16 new_sport)
3272{
3273 struct xfrm_user_mapping *um;
3274 struct nlmsghdr *nlh;
3275
3276 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3277 if (nlh == NULL)
3278 return -EMSGSIZE;
3279
3280 um = nlmsg_data(nlh);
3281
3282 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3283 um->id.spi = x->id.spi;
3284 um->id.family = x->props.family;
3285 um->id.proto = x->id.proto;
3286 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3287 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3288 um->new_sport = new_sport;
3289 um->old_sport = x->encap->encap_sport;
3290 um->reqid = x->props.reqid;
3291
3292 nlmsg_end(skb, nlh);
3293 return 0;
3294}
3295
3296static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3297 __be16 sport)
3298{
3299 struct net *net = xs_net(x);
3300 struct sk_buff *skb;
3301 int err;
3302
3303 if (x->id.proto != IPPROTO_ESP)
3304 return -EINVAL;
3305
3306 if (!x->encap)
3307 return -EINVAL;
3308
3309 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3310 if (skb == NULL)
3311 return -ENOMEM;
3312
3313 err = build_mapping(skb, x, ipaddr, sport);
3314 BUG_ON(err < 0);
3315
3316 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3317}
3318
3319static bool xfrm_is_alive(const struct km_event *c)
3320{
3321 return (bool)xfrm_acquire_is_on(c->net);
3322}
3323
3324static struct xfrm_mgr netlink_mgr = {
3325 .notify = xfrm_send_state_notify,
3326 .acquire = xfrm_send_acquire,
3327 .compile_policy = xfrm_compile_policy,
3328 .notify_policy = xfrm_send_policy_notify,
3329 .report = xfrm_send_report,
3330 .migrate = xfrm_send_migrate,
3331 .new_mapping = xfrm_send_mapping,
3332 .is_alive = xfrm_is_alive,
3333};
3334
3335static int __net_init xfrm_user_net_init(struct net *net)
3336{
3337 struct sock *nlsk;
3338 struct netlink_kernel_cfg cfg = {
3339 .groups = XFRMNLGRP_MAX,
3340 .input = xfrm_netlink_rcv,
3341 };
3342
3343 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3344 if (nlsk == NULL)
3345 return -ENOMEM;
3346 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3347 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3348 return 0;
3349}
3350
3351static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3352{
3353 struct net *net;
3354 list_for_each_entry(net, net_exit_list, exit_list)
3355 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3356 synchronize_net();
3357 list_for_each_entry(net, net_exit_list, exit_list)
3358 netlink_kernel_release(net->xfrm.nlsk_stash);
3359}
3360
3361static struct pernet_operations xfrm_user_net_ops = {
3362 .init = xfrm_user_net_init,
3363 .exit_batch = xfrm_user_net_exit,
3364};
3365
3366static int __init xfrm_user_init(void)
3367{
3368 int rv;
3369
3370 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3371
3372 rv = register_pernet_subsys(&xfrm_user_net_ops);
3373 if (rv < 0)
3374 return rv;
3375 rv = xfrm_register_km(&netlink_mgr);
3376 if (rv < 0)
3377 unregister_pernet_subsys(&xfrm_user_net_ops);
3378 return rv;
3379}
3380
3381static void __exit xfrm_user_exit(void)
3382{
3383 xfrm_unregister_km(&netlink_mgr);
3384 unregister_pernet_subsys(&xfrm_user_net_ops);
3385}
3386
3387module_init(xfrm_user_init);
3388module_exit(xfrm_user_exit);
3389MODULE_LICENSE("GPL");
3390MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);