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Linux 5.7.7
[linux/fpc-iii.git] / net / xfrm / xfrm_user.c
blobe6cfaa680ef3d9cd0efb7b98ee41f0caccdbdce0
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
37 static 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
63 static 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
79 static 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
95 static 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
104 static 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
120 static 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
148 static 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
285 out:
286 return err;
287 }
288
289 static 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
315 static 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
340 static 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
370 static 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
400 static 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
425 static 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
450 static 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
483 static 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
494 static 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 */
516 static 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
557 static 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
570 static 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
663 error:
664 x->km.state = XFRM_STATE_DEAD;
665 xfrm_state_put(x);
666 error_no_put:
667 *errp = err;
668 return NULL;
669 }
670
671 static 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);
711 out:
712 xfrm_state_put(x);
713 return err;
714 }
715
716 static 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
750 static 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
781 out:
782 xfrm_audit_state_delete(x, err ? 0 : 1, true);
783 xfrm_state_put(x);
784 return err;
785 }
786
787 static 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
806 struct 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
813 static 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
834 static 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
851 static 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
869 static 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! */
882 static 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);
969 out:
970 return ret;
971 }
972
973 static 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
998 static 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
1009 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1010 static 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
1054 static 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 */
1082 static 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
1095 static 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
1104 static 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
1157 static 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
1202 static 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
1222 static 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
1229 static 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
1261 static 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
1281 static 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);
1301 out_noput:
1302 return err;
1303 }
1304
1305 static 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
1363 out:
1364 xfrm_state_put(x);
1365 out_noput:
1366 return err;
1367 }
1368
1369 static 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
1384 static 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
1400 static 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
1454 static 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
1466 static 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
1491 static 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
1544 static 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
1564 static 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
1584 static 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
1596 static 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
1611 static 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
1645 static 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
1690 static 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
1719 static 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
1727 static 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 }
1733 static 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
1743 static 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
1755 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1756 {
1757 return 0;
1758 }
1759 #endif
1760
1761 static 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
1794 static 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
1803 static 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
1813 static 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
1829 static 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
1855 static 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 mark = xfrm_mark_get(attrs, &m);
1867 u32 if_id = 0;
1868
1869 p = nlmsg_data(nlh);
1870 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1871
1872 err = copy_from_user_policy_type(&type, attrs);
1873 if (err)
1874 return err;
1875
1876 err = verify_policy_dir(p->dir);
1877 if (err)
1878 return err;
1879
1880 if (attrs[XFRMA_IF_ID])
1881 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1882
1883 if (p->index)
1884 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, delete, &err);
1885 else {
1886 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1887 struct xfrm_sec_ctx *ctx;
1888
1889 err = verify_sec_ctx_len(attrs);
1890 if (err)
1891 return err;
1892
1893 ctx = NULL;
1894 if (rt) {
1895 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1896
1897 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1898 if (err)
1899 return err;
1900 }
1901 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, &p->sel,
1902 ctx, delete, &err);
1903 security_xfrm_policy_free(ctx);
1904 }
1905 if (xp == NULL)
1906 return -ENOENT;
1907
1908 if (!delete) {
1909 struct sk_buff *resp_skb;
1910
1911 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1912 if (IS_ERR(resp_skb)) {
1913 err = PTR_ERR(resp_skb);
1914 } else {
1915 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1916 NETLINK_CB(skb).portid);
1917 }
1918 } else {
1919 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1920
1921 if (err != 0)
1922 goto out;
1923
1924 c.data.byid = p->index;
1925 c.event = nlh->nlmsg_type;
1926 c.seq = nlh->nlmsg_seq;
1927 c.portid = nlh->nlmsg_pid;
1928 km_policy_notify(xp, p->dir, &c);
1929 }
1930
1931 out:
1932 xfrm_pol_put(xp);
1933 return err;
1934 }
1935
1936 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1937 struct nlattr **attrs)
1938 {
1939 struct net *net = sock_net(skb->sk);
1940 struct km_event c;
1941 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1942 int err;
1943
1944 err = xfrm_state_flush(net, p->proto, true, false);
1945 if (err) {
1946 if (err == -ESRCH) /* empty table */
1947 return 0;
1948 return err;
1949 }
1950 c.data.proto = p->proto;
1951 c.event = nlh->nlmsg_type;
1952 c.seq = nlh->nlmsg_seq;
1953 c.portid = nlh->nlmsg_pid;
1954 c.net = net;
1955 km_state_notify(NULL, &c);
1956
1957 return 0;
1958 }
1959
1960 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1961 {
1962 unsigned int replay_size = x->replay_esn ?
1963 xfrm_replay_state_esn_len(x->replay_esn) :
1964 sizeof(struct xfrm_replay_state);
1965
1966 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1967 + nla_total_size(replay_size)
1968 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1969 + nla_total_size(sizeof(struct xfrm_mark))
1970 + nla_total_size(4) /* XFRM_AE_RTHR */
1971 + nla_total_size(4); /* XFRM_AE_ETHR */
1972 }
1973
1974 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1975 {
1976 struct xfrm_aevent_id *id;
1977 struct nlmsghdr *nlh;
1978 int err;
1979
1980 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1981 if (nlh == NULL)
1982 return -EMSGSIZE;
1983
1984 id = nlmsg_data(nlh);
1985 memset(&id->sa_id, 0, sizeof(id->sa_id));
1986 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1987 id->sa_id.spi = x->id.spi;
1988 id->sa_id.family = x->props.family;
1989 id->sa_id.proto = x->id.proto;
1990 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1991 id->reqid = x->props.reqid;
1992 id->flags = c->data.aevent;
1993
1994 if (x->replay_esn) {
1995 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1996 xfrm_replay_state_esn_len(x->replay_esn),
1997 x->replay_esn);
1998 } else {
1999 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2000 &x->replay);
2001 }
2002 if (err)
2003 goto out_cancel;
2004 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2005 XFRMA_PAD);
2006 if (err)
2007 goto out_cancel;
2008
2009 if (id->flags & XFRM_AE_RTHR) {
2010 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2011 if (err)
2012 goto out_cancel;
2013 }
2014 if (id->flags & XFRM_AE_ETHR) {
2015 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2016 x->replay_maxage * 10 / HZ);
2017 if (err)
2018 goto out_cancel;
2019 }
2020 err = xfrm_mark_put(skb, &x->mark);
2021 if (err)
2022 goto out_cancel;
2023
2024 err = xfrm_if_id_put(skb, x->if_id);
2025 if (err)
2026 goto out_cancel;
2027
2028 nlmsg_end(skb, nlh);
2029 return 0;
2030
2031 out_cancel:
2032 nlmsg_cancel(skb, nlh);
2033 return err;
2034 }
2035
2036 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2037 struct nlattr **attrs)
2038 {
2039 struct net *net = sock_net(skb->sk);
2040 struct xfrm_state *x;
2041 struct sk_buff *r_skb;
2042 int err;
2043 struct km_event c;
2044 u32 mark;
2045 struct xfrm_mark m;
2046 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2047 struct xfrm_usersa_id *id = &p->sa_id;
2048
2049 mark = xfrm_mark_get(attrs, &m);
2050
2051 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2052 if (x == NULL)
2053 return -ESRCH;
2054
2055 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2056 if (r_skb == NULL) {
2057 xfrm_state_put(x);
2058 return -ENOMEM;
2059 }
2060
2061 /*
2062 * XXX: is this lock really needed - none of the other
2063 * gets lock (the concern is things getting updated
2064 * while we are still reading) - jhs
2065 */
2066 spin_lock_bh(&x->lock);
2067 c.data.aevent = p->flags;
2068 c.seq = nlh->nlmsg_seq;
2069 c.portid = nlh->nlmsg_pid;
2070
2071 err = build_aevent(r_skb, x, &c);
2072 BUG_ON(err < 0);
2073
2074 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2075 spin_unlock_bh(&x->lock);
2076 xfrm_state_put(x);
2077 return err;
2078 }
2079
2080 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2081 struct nlattr **attrs)
2082 {
2083 struct net *net = sock_net(skb->sk);
2084 struct xfrm_state *x;
2085 struct km_event c;
2086 int err = -EINVAL;
2087 u32 mark = 0;
2088 struct xfrm_mark m;
2089 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2090 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2091 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2092 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2093 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2094 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2095
2096 if (!lt && !rp && !re && !et && !rt)
2097 return err;
2098
2099 /* pedantic mode - thou shalt sayeth replaceth */
2100 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2101 return err;
2102
2103 mark = xfrm_mark_get(attrs, &m);
2104
2105 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2106 if (x == NULL)
2107 return -ESRCH;
2108
2109 if (x->km.state != XFRM_STATE_VALID)
2110 goto out;
2111
2112 err = xfrm_replay_verify_len(x->replay_esn, re);
2113 if (err)
2114 goto out;
2115
2116 spin_lock_bh(&x->lock);
2117 xfrm_update_ae_params(x, attrs, 1);
2118 spin_unlock_bh(&x->lock);
2119
2120 c.event = nlh->nlmsg_type;
2121 c.seq = nlh->nlmsg_seq;
2122 c.portid = nlh->nlmsg_pid;
2123 c.data.aevent = XFRM_AE_CU;
2124 km_state_notify(x, &c);
2125 err = 0;
2126 out:
2127 xfrm_state_put(x);
2128 return err;
2129 }
2130
2131 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2132 struct nlattr **attrs)
2133 {
2134 struct net *net = sock_net(skb->sk);
2135 struct km_event c;
2136 u8 type = XFRM_POLICY_TYPE_MAIN;
2137 int err;
2138
2139 err = copy_from_user_policy_type(&type, attrs);
2140 if (err)
2141 return err;
2142
2143 err = xfrm_policy_flush(net, type, true);
2144 if (err) {
2145 if (err == -ESRCH) /* empty table */
2146 return 0;
2147 return err;
2148 }
2149
2150 c.data.type = type;
2151 c.event = nlh->nlmsg_type;
2152 c.seq = nlh->nlmsg_seq;
2153 c.portid = nlh->nlmsg_pid;
2154 c.net = net;
2155 km_policy_notify(NULL, 0, &c);
2156 return 0;
2157 }
2158
2159 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2160 struct nlattr **attrs)
2161 {
2162 struct net *net = sock_net(skb->sk);
2163 struct xfrm_policy *xp;
2164 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2165 struct xfrm_userpolicy_info *p = &up->pol;
2166 u8 type = XFRM_POLICY_TYPE_MAIN;
2167 int err = -ENOENT;
2168 struct xfrm_mark m;
2169 u32 mark = xfrm_mark_get(attrs, &m);
2170 u32 if_id = 0;
2171
2172 err = copy_from_user_policy_type(&type, attrs);
2173 if (err)
2174 return err;
2175
2176 err = verify_policy_dir(p->dir);
2177 if (err)
2178 return err;
2179
2180 if (attrs[XFRMA_IF_ID])
2181 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2182
2183 if (p->index)
2184 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, 0, &err);
2185 else {
2186 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2187 struct xfrm_sec_ctx *ctx;
2188
2189 err = verify_sec_ctx_len(attrs);
2190 if (err)
2191 return err;
2192
2193 ctx = NULL;
2194 if (rt) {
2195 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2196
2197 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2198 if (err)
2199 return err;
2200 }
2201 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir,
2202 &p->sel, ctx, 0, &err);
2203 security_xfrm_policy_free(ctx);
2204 }
2205 if (xp == NULL)
2206 return -ENOENT;
2207
2208 if (unlikely(xp->walk.dead))
2209 goto out;
2210
2211 err = 0;
2212 if (up->hard) {
2213 xfrm_policy_delete(xp, p->dir);
2214 xfrm_audit_policy_delete(xp, 1, true);
2215 }
2216 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2217
2218 out:
2219 xfrm_pol_put(xp);
2220 return err;
2221 }
2222
2223 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2224 struct nlattr **attrs)
2225 {
2226 struct net *net = sock_net(skb->sk);
2227 struct xfrm_state *x;
2228 int err;
2229 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2230 struct xfrm_usersa_info *p = &ue->state;
2231 struct xfrm_mark m;
2232 u32 mark = xfrm_mark_get(attrs, &m);
2233
2234 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2235
2236 err = -ENOENT;
2237 if (x == NULL)
2238 return err;
2239
2240 spin_lock_bh(&x->lock);
2241 err = -EINVAL;
2242 if (x->km.state != XFRM_STATE_VALID)
2243 goto out;
2244 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2245
2246 if (ue->hard) {
2247 __xfrm_state_delete(x);
2248 xfrm_audit_state_delete(x, 1, true);
2249 }
2250 err = 0;
2251 out:
2252 spin_unlock_bh(&x->lock);
2253 xfrm_state_put(x);
2254 return err;
2255 }
2256
2257 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2258 struct nlattr **attrs)
2259 {
2260 struct net *net = sock_net(skb->sk);
2261 struct xfrm_policy *xp;
2262 struct xfrm_user_tmpl *ut;
2263 int i;
2264 struct nlattr *rt = attrs[XFRMA_TMPL];
2265 struct xfrm_mark mark;
2266
2267 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2268 struct xfrm_state *x = xfrm_state_alloc(net);
2269 int err = -ENOMEM;
2270
2271 if (!x)
2272 goto nomem;
2273
2274 xfrm_mark_get(attrs, &mark);
2275
2276 err = verify_newpolicy_info(&ua->policy);
2277 if (err)
2278 goto free_state;
2279 err = verify_sec_ctx_len(attrs);
2280 if (err)
2281 goto free_state;
2282
2283 /* build an XP */
2284 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2285 if (!xp)
2286 goto free_state;
2287
2288 memcpy(&x->id, &ua->id, sizeof(ua->id));
2289 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2290 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2291 xp->mark.m = x->mark.m = mark.m;
2292 xp->mark.v = x->mark.v = mark.v;
2293 ut = nla_data(rt);
2294 /* extract the templates and for each call km_key */
2295 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2296 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2297 memcpy(&x->id, &t->id, sizeof(x->id));
2298 x->props.mode = t->mode;
2299 x->props.reqid = t->reqid;
2300 x->props.family = ut->family;
2301 t->aalgos = ua->aalgos;
2302 t->ealgos = ua->ealgos;
2303 t->calgos = ua->calgos;
2304 err = km_query(x, t, xp);
2305
2306 }
2307
2308 xfrm_state_free(x);
2309 kfree(xp);
2310
2311 return 0;
2312
2313 free_state:
2314 xfrm_state_free(x);
2315 nomem:
2316 return err;
2317 }
2318
2319 #ifdef CONFIG_XFRM_MIGRATE
2320 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2321 struct xfrm_kmaddress *k,
2322 struct nlattr **attrs, int *num)
2323 {
2324 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2325 struct xfrm_user_migrate *um;
2326 int i, num_migrate;
2327
2328 if (k != NULL) {
2329 struct xfrm_user_kmaddress *uk;
2330
2331 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2332 memcpy(&k->local, &uk->local, sizeof(k->local));
2333 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2334 k->family = uk->family;
2335 k->reserved = uk->reserved;
2336 }
2337
2338 um = nla_data(rt);
2339 num_migrate = nla_len(rt) / sizeof(*um);
2340
2341 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2342 return -EINVAL;
2343
2344 for (i = 0; i < num_migrate; i++, um++, ma++) {
2345 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2346 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2347 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2348 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2349
2350 ma->proto = um->proto;
2351 ma->mode = um->mode;
2352 ma->reqid = um->reqid;
2353
2354 ma->old_family = um->old_family;
2355 ma->new_family = um->new_family;
2356 }
2357
2358 *num = i;
2359 return 0;
2360 }
2361
2362 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2363 struct nlattr **attrs)
2364 {
2365 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2366 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2367 struct xfrm_kmaddress km, *kmp;
2368 u8 type;
2369 int err;
2370 int n = 0;
2371 struct net *net = sock_net(skb->sk);
2372 struct xfrm_encap_tmpl *encap = NULL;
2373
2374 if (attrs[XFRMA_MIGRATE] == NULL)
2375 return -EINVAL;
2376
2377 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2378
2379 err = copy_from_user_policy_type(&type, attrs);
2380 if (err)
2381 return err;
2382
2383 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2384 if (err)
2385 return err;
2386
2387 if (!n)
2388 return 0;
2389
2390 if (attrs[XFRMA_ENCAP]) {
2391 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2392 sizeof(*encap), GFP_KERNEL);
2393 if (!encap)
2394 return 0;
2395 }
2396
2397 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2398
2399 kfree(encap);
2400
2401 return err;
2402 }
2403 #else
2404 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2405 struct nlattr **attrs)
2406 {
2407 return -ENOPROTOOPT;
2408 }
2409 #endif
2410
2411 #ifdef CONFIG_XFRM_MIGRATE
2412 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2413 {
2414 struct xfrm_user_migrate um;
2415
2416 memset(&um, 0, sizeof(um));
2417 um.proto = m->proto;
2418 um.mode = m->mode;
2419 um.reqid = m->reqid;
2420 um.old_family = m->old_family;
2421 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2422 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2423 um.new_family = m->new_family;
2424 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2425 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2426
2427 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2428 }
2429
2430 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2431 {
2432 struct xfrm_user_kmaddress uk;
2433
2434 memset(&uk, 0, sizeof(uk));
2435 uk.family = k->family;
2436 uk.reserved = k->reserved;
2437 memcpy(&uk.local, &k->local, sizeof(uk.local));
2438 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2439
2440 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2441 }
2442
2443 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2444 int with_encp)
2445 {
2446 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2447 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2448 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2449 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2450 + userpolicy_type_attrsize();
2451 }
2452
2453 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2454 int num_migrate, const struct xfrm_kmaddress *k,
2455 const struct xfrm_selector *sel,
2456 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2457 {
2458 const struct xfrm_migrate *mp;
2459 struct xfrm_userpolicy_id *pol_id;
2460 struct nlmsghdr *nlh;
2461 int i, err;
2462
2463 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2464 if (nlh == NULL)
2465 return -EMSGSIZE;
2466
2467 pol_id = nlmsg_data(nlh);
2468 /* copy data from selector, dir, and type to the pol_id */
2469 memset(pol_id, 0, sizeof(*pol_id));
2470 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2471 pol_id->dir = dir;
2472
2473 if (k != NULL) {
2474 err = copy_to_user_kmaddress(k, skb);
2475 if (err)
2476 goto out_cancel;
2477 }
2478 if (encap) {
2479 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2480 if (err)
2481 goto out_cancel;
2482 }
2483 err = copy_to_user_policy_type(type, skb);
2484 if (err)
2485 goto out_cancel;
2486 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2487 err = copy_to_user_migrate(mp, skb);
2488 if (err)
2489 goto out_cancel;
2490 }
2491
2492 nlmsg_end(skb, nlh);
2493 return 0;
2494
2495 out_cancel:
2496 nlmsg_cancel(skb, nlh);
2497 return err;
2498 }
2499
2500 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2501 const struct xfrm_migrate *m, int num_migrate,
2502 const struct xfrm_kmaddress *k,
2503 const struct xfrm_encap_tmpl *encap)
2504 {
2505 struct net *net = &init_net;
2506 struct sk_buff *skb;
2507 int err;
2508
2509 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2510 GFP_ATOMIC);
2511 if (skb == NULL)
2512 return -ENOMEM;
2513
2514 /* build migrate */
2515 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2516 BUG_ON(err < 0);
2517
2518 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2519 }
2520 #else
2521 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2522 const struct xfrm_migrate *m, int num_migrate,
2523 const struct xfrm_kmaddress *k,
2524 const struct xfrm_encap_tmpl *encap)
2525 {
2526 return -ENOPROTOOPT;
2527 }
2528 #endif
2529
2530 #define XMSGSIZE(type) sizeof(struct type)
2531
2532 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2533 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2534 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2535 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2536 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2537 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2538 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2539 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2540 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2541 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2542 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2543 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2544 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2545 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2546 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2547 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2548 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2549 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2550 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2551 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2552 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2553 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2554 };
2555
2556 #undef XMSGSIZE
2557
2558 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2559 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2560 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2561 [XFRMA_LASTUSED] = { .type = NLA_U64},
2562 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2563 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2564 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2565 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2566 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2567 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2568 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2569 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2570 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2571 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2572 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2573 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2574 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2575 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2576 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2577 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2578 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2579 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2580 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2581 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2582 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2583 [XFRMA_PROTO] = { .type = NLA_U8 },
2584 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2585 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2586 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2587 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2588 [XFRMA_IF_ID] = { .type = NLA_U32 },
2589 };
2590
2591 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2592 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2593 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2594 };
2595
2596 static const struct xfrm_link {
2597 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2598 int (*start)(struct netlink_callback *);
2599 int (*dump)(struct sk_buff *, struct netlink_callback *);
2600 int (*done)(struct netlink_callback *);
2601 const struct nla_policy *nla_pol;
2602 int nla_max;
2603 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2604 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2605 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2606 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2607 .dump = xfrm_dump_sa,
2608 .done = xfrm_dump_sa_done },
2609 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2610 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2611 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2612 .start = xfrm_dump_policy_start,
2613 .dump = xfrm_dump_policy,
2614 .done = xfrm_dump_policy_done },
2615 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2616 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2617 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2618 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2619 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2620 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2621 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2622 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2623 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2624 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2625 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2626 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2627 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2628 .nla_pol = xfrma_spd_policy,
2629 .nla_max = XFRMA_SPD_MAX },
2630 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2631 };
2632
2633 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2634 struct netlink_ext_ack *extack)
2635 {
2636 struct net *net = sock_net(skb->sk);
2637 struct nlattr *attrs[XFRMA_MAX+1];
2638 const struct xfrm_link *link;
2639 int type, err;
2640
2641 if (in_compat_syscall())
2642 return -EOPNOTSUPP;
2643
2644 type = nlh->nlmsg_type;
2645 if (type > XFRM_MSG_MAX)
2646 return -EINVAL;
2647
2648 type -= XFRM_MSG_BASE;
2649 link = &xfrm_dispatch[type];
2650
2651 /* All operations require privileges, even GET */
2652 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2653 return -EPERM;
2654
2655 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2656 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2657 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2658 if (link->dump == NULL)
2659 return -EINVAL;
2660
2661 {
2662 struct netlink_dump_control c = {
2663 .start = link->start,
2664 .dump = link->dump,
2665 .done = link->done,
2666 };
2667 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2668 }
2669 }
2670
2671 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2672 link->nla_max ? : XFRMA_MAX,
2673 link->nla_pol ? : xfrma_policy, extack);
2674 if (err < 0)
2675 return err;
2676
2677 if (link->doit == NULL)
2678 return -EINVAL;
2679
2680 return link->doit(skb, nlh, attrs);
2681 }
2682
2683 static void xfrm_netlink_rcv(struct sk_buff *skb)
2684 {
2685 struct net *net = sock_net(skb->sk);
2686
2687 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2688 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2689 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2690 }
2691
2692 static inline unsigned int xfrm_expire_msgsize(void)
2693 {
2694 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2695 + nla_total_size(sizeof(struct xfrm_mark));
2696 }
2697
2698 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2699 {
2700 struct xfrm_user_expire *ue;
2701 struct nlmsghdr *nlh;
2702 int err;
2703
2704 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2705 if (nlh == NULL)
2706 return -EMSGSIZE;
2707
2708 ue = nlmsg_data(nlh);
2709 copy_to_user_state(x, &ue->state);
2710 ue->hard = (c->data.hard != 0) ? 1 : 0;
2711 /* clear the padding bytes */
2712 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2713
2714 err = xfrm_mark_put(skb, &x->mark);
2715 if (err)
2716 return err;
2717
2718 err = xfrm_if_id_put(skb, x->if_id);
2719 if (err)
2720 return err;
2721
2722 nlmsg_end(skb, nlh);
2723 return 0;
2724 }
2725
2726 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2727 {
2728 struct net *net = xs_net(x);
2729 struct sk_buff *skb;
2730
2731 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2732 if (skb == NULL)
2733 return -ENOMEM;
2734
2735 if (build_expire(skb, x, c) < 0) {
2736 kfree_skb(skb);
2737 return -EMSGSIZE;
2738 }
2739
2740 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2741 }
2742
2743 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2744 {
2745 struct net *net = xs_net(x);
2746 struct sk_buff *skb;
2747 int err;
2748
2749 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2750 if (skb == NULL)
2751 return -ENOMEM;
2752
2753 err = build_aevent(skb, x, c);
2754 BUG_ON(err < 0);
2755
2756 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2757 }
2758
2759 static int xfrm_notify_sa_flush(const struct km_event *c)
2760 {
2761 struct net *net = c->net;
2762 struct xfrm_usersa_flush *p;
2763 struct nlmsghdr *nlh;
2764 struct sk_buff *skb;
2765 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2766
2767 skb = nlmsg_new(len, GFP_ATOMIC);
2768 if (skb == NULL)
2769 return -ENOMEM;
2770
2771 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2772 if (nlh == NULL) {
2773 kfree_skb(skb);
2774 return -EMSGSIZE;
2775 }
2776
2777 p = nlmsg_data(nlh);
2778 p->proto = c->data.proto;
2779
2780 nlmsg_end(skb, nlh);
2781
2782 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2783 }
2784
2785 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2786 {
2787 unsigned int l = 0;
2788 if (x->aead)
2789 l += nla_total_size(aead_len(x->aead));
2790 if (x->aalg) {
2791 l += nla_total_size(sizeof(struct xfrm_algo) +
2792 (x->aalg->alg_key_len + 7) / 8);
2793 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2794 }
2795 if (x->ealg)
2796 l += nla_total_size(xfrm_alg_len(x->ealg));
2797 if (x->calg)
2798 l += nla_total_size(sizeof(*x->calg));
2799 if (x->encap)
2800 l += nla_total_size(sizeof(*x->encap));
2801 if (x->tfcpad)
2802 l += nla_total_size(sizeof(x->tfcpad));
2803 if (x->replay_esn)
2804 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2805 else
2806 l += nla_total_size(sizeof(struct xfrm_replay_state));
2807 if (x->security)
2808 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2809 x->security->ctx_len);
2810 if (x->coaddr)
2811 l += nla_total_size(sizeof(*x->coaddr));
2812 if (x->props.extra_flags)
2813 l += nla_total_size(sizeof(x->props.extra_flags));
2814 if (x->xso.dev)
2815 l += nla_total_size(sizeof(x->xso));
2816 if (x->props.smark.v | x->props.smark.m) {
2817 l += nla_total_size(sizeof(x->props.smark.v));
2818 l += nla_total_size(sizeof(x->props.smark.m));
2819 }
2820 if (x->if_id)
2821 l += nla_total_size(sizeof(x->if_id));
2822
2823 /* Must count x->lastused as it may become non-zero behind our back. */
2824 l += nla_total_size_64bit(sizeof(u64));
2825
2826 return l;
2827 }
2828
2829 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2830 {
2831 struct net *net = xs_net(x);
2832 struct xfrm_usersa_info *p;
2833 struct xfrm_usersa_id *id;
2834 struct nlmsghdr *nlh;
2835 struct sk_buff *skb;
2836 unsigned int len = xfrm_sa_len(x);
2837 unsigned int headlen;
2838 int err;
2839
2840 headlen = sizeof(*p);
2841 if (c->event == XFRM_MSG_DELSA) {
2842 len += nla_total_size(headlen);
2843 headlen = sizeof(*id);
2844 len += nla_total_size(sizeof(struct xfrm_mark));
2845 }
2846 len += NLMSG_ALIGN(headlen);
2847
2848 skb = nlmsg_new(len, GFP_ATOMIC);
2849 if (skb == NULL)
2850 return -ENOMEM;
2851
2852 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2853 err = -EMSGSIZE;
2854 if (nlh == NULL)
2855 goto out_free_skb;
2856
2857 p = nlmsg_data(nlh);
2858 if (c->event == XFRM_MSG_DELSA) {
2859 struct nlattr *attr;
2860
2861 id = nlmsg_data(nlh);
2862 memset(id, 0, sizeof(*id));
2863 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2864 id->spi = x->id.spi;
2865 id->family = x->props.family;
2866 id->proto = x->id.proto;
2867
2868 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2869 err = -EMSGSIZE;
2870 if (attr == NULL)
2871 goto out_free_skb;
2872
2873 p = nla_data(attr);
2874 }
2875 err = copy_to_user_state_extra(x, p, skb);
2876 if (err)
2877 goto out_free_skb;
2878
2879 nlmsg_end(skb, nlh);
2880
2881 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2882
2883 out_free_skb:
2884 kfree_skb(skb);
2885 return err;
2886 }
2887
2888 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2889 {
2890
2891 switch (c->event) {
2892 case XFRM_MSG_EXPIRE:
2893 return xfrm_exp_state_notify(x, c);
2894 case XFRM_MSG_NEWAE:
2895 return xfrm_aevent_state_notify(x, c);
2896 case XFRM_MSG_DELSA:
2897 case XFRM_MSG_UPDSA:
2898 case XFRM_MSG_NEWSA:
2899 return xfrm_notify_sa(x, c);
2900 case XFRM_MSG_FLUSHSA:
2901 return xfrm_notify_sa_flush(c);
2902 default:
2903 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2904 c->event);
2905 break;
2906 }
2907
2908 return 0;
2909
2910 }
2911
2912 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2913 struct xfrm_policy *xp)
2914 {
2915 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2916 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2917 + nla_total_size(sizeof(struct xfrm_mark))
2918 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2919 + userpolicy_type_attrsize();
2920 }
2921
2922 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2923 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2924 {
2925 __u32 seq = xfrm_get_acqseq();
2926 struct xfrm_user_acquire *ua;
2927 struct nlmsghdr *nlh;
2928 int err;
2929
2930 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2931 if (nlh == NULL)
2932 return -EMSGSIZE;
2933
2934 ua = nlmsg_data(nlh);
2935 memcpy(&ua->id, &x->id, sizeof(ua->id));
2936 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2937 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2938 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2939 ua->aalgos = xt->aalgos;
2940 ua->ealgos = xt->ealgos;
2941 ua->calgos = xt->calgos;
2942 ua->seq = x->km.seq = seq;
2943
2944 err = copy_to_user_tmpl(xp, skb);
2945 if (!err)
2946 err = copy_to_user_state_sec_ctx(x, skb);
2947 if (!err)
2948 err = copy_to_user_policy_type(xp->type, skb);
2949 if (!err)
2950 err = xfrm_mark_put(skb, &xp->mark);
2951 if (!err)
2952 err = xfrm_if_id_put(skb, xp->if_id);
2953 if (err) {
2954 nlmsg_cancel(skb, nlh);
2955 return err;
2956 }
2957
2958 nlmsg_end(skb, nlh);
2959 return 0;
2960 }
2961
2962 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2963 struct xfrm_policy *xp)
2964 {
2965 struct net *net = xs_net(x);
2966 struct sk_buff *skb;
2967 int err;
2968
2969 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2970 if (skb == NULL)
2971 return -ENOMEM;
2972
2973 err = build_acquire(skb, x, xt, xp);
2974 BUG_ON(err < 0);
2975
2976 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2977 }
2978
2979 /* User gives us xfrm_user_policy_info followed by an array of 0
2980 * or more templates.
2981 */
2982 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2983 u8 *data, int len, int *dir)
2984 {
2985 struct net *net = sock_net(sk);
2986 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2987 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2988 struct xfrm_policy *xp;
2989 int nr;
2990
2991 switch (sk->sk_family) {
2992 case AF_INET:
2993 if (opt != IP_XFRM_POLICY) {
2994 *dir = -EOPNOTSUPP;
2995 return NULL;
2996 }
2997 break;
2998 #if IS_ENABLED(CONFIG_IPV6)
2999 case AF_INET6:
3000 if (opt != IPV6_XFRM_POLICY) {
3001 *dir = -EOPNOTSUPP;
3002 return NULL;
3003 }
3004 break;
3005 #endif
3006 default:
3007 *dir = -EINVAL;
3008 return NULL;
3009 }
3010
3011 *dir = -EINVAL;
3012
3013 if (len < sizeof(*p) ||
3014 verify_newpolicy_info(p))
3015 return NULL;
3016
3017 nr = ((len - sizeof(*p)) / sizeof(*ut));
3018 if (validate_tmpl(nr, ut, p->sel.family))
3019 return NULL;
3020
3021 if (p->dir > XFRM_POLICY_OUT)
3022 return NULL;
3023
3024 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3025 if (xp == NULL) {
3026 *dir = -ENOBUFS;
3027 return NULL;
3028 }
3029
3030 copy_from_user_policy(xp, p);
3031 xp->type = XFRM_POLICY_TYPE_MAIN;
3032 copy_templates(xp, ut, nr);
3033
3034 *dir = p->dir;
3035
3036 return xp;
3037 }
3038
3039 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3040 {
3041 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3042 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3043 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3044 + nla_total_size(sizeof(struct xfrm_mark))
3045 + userpolicy_type_attrsize();
3046 }
3047
3048 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3049 int dir, const struct km_event *c)
3050 {
3051 struct xfrm_user_polexpire *upe;
3052 int hard = c->data.hard;
3053 struct nlmsghdr *nlh;
3054 int err;
3055
3056 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3057 if (nlh == NULL)
3058 return -EMSGSIZE;
3059
3060 upe = nlmsg_data(nlh);
3061 copy_to_user_policy(xp, &upe->pol, dir);
3062 err = copy_to_user_tmpl(xp, skb);
3063 if (!err)
3064 err = copy_to_user_sec_ctx(xp, skb);
3065 if (!err)
3066 err = copy_to_user_policy_type(xp->type, skb);
3067 if (!err)
3068 err = xfrm_mark_put(skb, &xp->mark);
3069 if (!err)
3070 err = xfrm_if_id_put(skb, xp->if_id);
3071 if (err) {
3072 nlmsg_cancel(skb, nlh);
3073 return err;
3074 }
3075 upe->hard = !!hard;
3076
3077 nlmsg_end(skb, nlh);
3078 return 0;
3079 }
3080
3081 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3082 {
3083 struct net *net = xp_net(xp);
3084 struct sk_buff *skb;
3085 int err;
3086
3087 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3088 if (skb == NULL)
3089 return -ENOMEM;
3090
3091 err = build_polexpire(skb, xp, dir, c);
3092 BUG_ON(err < 0);
3093
3094 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3095 }
3096
3097 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3098 {
3099 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3100 struct net *net = xp_net(xp);
3101 struct xfrm_userpolicy_info *p;
3102 struct xfrm_userpolicy_id *id;
3103 struct nlmsghdr *nlh;
3104 struct sk_buff *skb;
3105 unsigned int headlen;
3106 int err;
3107
3108 headlen = sizeof(*p);
3109 if (c->event == XFRM_MSG_DELPOLICY) {
3110 len += nla_total_size(headlen);
3111 headlen = sizeof(*id);
3112 }
3113 len += userpolicy_type_attrsize();
3114 len += nla_total_size(sizeof(struct xfrm_mark));
3115 len += NLMSG_ALIGN(headlen);
3116
3117 skb = nlmsg_new(len, GFP_ATOMIC);
3118 if (skb == NULL)
3119 return -ENOMEM;
3120
3121 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3122 err = -EMSGSIZE;
3123 if (nlh == NULL)
3124 goto out_free_skb;
3125
3126 p = nlmsg_data(nlh);
3127 if (c->event == XFRM_MSG_DELPOLICY) {
3128 struct nlattr *attr;
3129
3130 id = nlmsg_data(nlh);
3131 memset(id, 0, sizeof(*id));
3132 id->dir = dir;
3133 if (c->data.byid)
3134 id->index = xp->index;
3135 else
3136 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3137
3138 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3139 err = -EMSGSIZE;
3140 if (attr == NULL)
3141 goto out_free_skb;
3142
3143 p = nla_data(attr);
3144 }
3145
3146 copy_to_user_policy(xp, p, dir);
3147 err = copy_to_user_tmpl(xp, skb);
3148 if (!err)
3149 err = copy_to_user_policy_type(xp->type, skb);
3150 if (!err)
3151 err = xfrm_mark_put(skb, &xp->mark);
3152 if (!err)
3153 err = xfrm_if_id_put(skb, xp->if_id);
3154 if (err)
3155 goto out_free_skb;
3156
3157 nlmsg_end(skb, nlh);
3158
3159 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3160
3161 out_free_skb:
3162 kfree_skb(skb);
3163 return err;
3164 }
3165
3166 static int xfrm_notify_policy_flush(const struct km_event *c)
3167 {
3168 struct net *net = c->net;
3169 struct nlmsghdr *nlh;
3170 struct sk_buff *skb;
3171 int err;
3172
3173 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3174 if (skb == NULL)
3175 return -ENOMEM;
3176
3177 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3178 err = -EMSGSIZE;
3179 if (nlh == NULL)
3180 goto out_free_skb;
3181 err = copy_to_user_policy_type(c->data.type, skb);
3182 if (err)
3183 goto out_free_skb;
3184
3185 nlmsg_end(skb, nlh);
3186
3187 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3188
3189 out_free_skb:
3190 kfree_skb(skb);
3191 return err;
3192 }
3193
3194 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3195 {
3196
3197 switch (c->event) {
3198 case XFRM_MSG_NEWPOLICY:
3199 case XFRM_MSG_UPDPOLICY:
3200 case XFRM_MSG_DELPOLICY:
3201 return xfrm_notify_policy(xp, dir, c);
3202 case XFRM_MSG_FLUSHPOLICY:
3203 return xfrm_notify_policy_flush(c);
3204 case XFRM_MSG_POLEXPIRE:
3205 return xfrm_exp_policy_notify(xp, dir, c);
3206 default:
3207 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3208 c->event);
3209 }
3210
3211 return 0;
3212
3213 }
3214
3215 static inline unsigned int xfrm_report_msgsize(void)
3216 {
3217 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3218 }
3219
3220 static int build_report(struct sk_buff *skb, u8 proto,
3221 struct xfrm_selector *sel, xfrm_address_t *addr)
3222 {
3223 struct xfrm_user_report *ur;
3224 struct nlmsghdr *nlh;
3225
3226 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3227 if (nlh == NULL)
3228 return -EMSGSIZE;
3229
3230 ur = nlmsg_data(nlh);
3231 ur->proto = proto;
3232 memcpy(&ur->sel, sel, sizeof(ur->sel));
3233
3234 if (addr) {
3235 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3236 if (err) {
3237 nlmsg_cancel(skb, nlh);
3238 return err;
3239 }
3240 }
3241 nlmsg_end(skb, nlh);
3242 return 0;
3243 }
3244
3245 static int xfrm_send_report(struct net *net, u8 proto,
3246 struct xfrm_selector *sel, xfrm_address_t *addr)
3247 {
3248 struct sk_buff *skb;
3249 int err;
3250
3251 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3252 if (skb == NULL)
3253 return -ENOMEM;
3254
3255 err = build_report(skb, proto, sel, addr);
3256 BUG_ON(err < 0);
3257
3258 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3259 }
3260
3261 static inline unsigned int xfrm_mapping_msgsize(void)
3262 {
3263 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3264 }
3265
3266 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3267 xfrm_address_t *new_saddr, __be16 new_sport)
3268 {
3269 struct xfrm_user_mapping *um;
3270 struct nlmsghdr *nlh;
3271
3272 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3273 if (nlh == NULL)
3274 return -EMSGSIZE;
3275
3276 um = nlmsg_data(nlh);
3277
3278 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3279 um->id.spi = x->id.spi;
3280 um->id.family = x->props.family;
3281 um->id.proto = x->id.proto;
3282 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3283 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3284 um->new_sport = new_sport;
3285 um->old_sport = x->encap->encap_sport;
3286 um->reqid = x->props.reqid;
3287
3288 nlmsg_end(skb, nlh);
3289 return 0;
3290 }
3291
3292 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3293 __be16 sport)
3294 {
3295 struct net *net = xs_net(x);
3296 struct sk_buff *skb;
3297 int err;
3298
3299 if (x->id.proto != IPPROTO_ESP)
3300 return -EINVAL;
3301
3302 if (!x->encap)
3303 return -EINVAL;
3304
3305 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3306 if (skb == NULL)
3307 return -ENOMEM;
3308
3309 err = build_mapping(skb, x, ipaddr, sport);
3310 BUG_ON(err < 0);
3311
3312 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3313 }
3314
3315 static bool xfrm_is_alive(const struct km_event *c)
3316 {
3317 return (bool)xfrm_acquire_is_on(c->net);
3318 }
3319
3320 static struct xfrm_mgr netlink_mgr = {
3321 .notify = xfrm_send_state_notify,
3322 .acquire = xfrm_send_acquire,
3323 .compile_policy = xfrm_compile_policy,
3324 .notify_policy = xfrm_send_policy_notify,
3325 .report = xfrm_send_report,
3326 .migrate = xfrm_send_migrate,
3327 .new_mapping = xfrm_send_mapping,
3328 .is_alive = xfrm_is_alive,
3329 };
3330
3331 static int __net_init xfrm_user_net_init(struct net *net)
3332 {
3333 struct sock *nlsk;
3334 struct netlink_kernel_cfg cfg = {
3335 .groups = XFRMNLGRP_MAX,
3336 .input = xfrm_netlink_rcv,
3337 };
3338
3339 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3340 if (nlsk == NULL)
3341 return -ENOMEM;
3342 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3343 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3344 return 0;
3345 }
3346
3347 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3348 {
3349 struct net *net;
3350 list_for_each_entry(net, net_exit_list, exit_list)
3351 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3352 synchronize_net();
3353 list_for_each_entry(net, net_exit_list, exit_list)
3354 netlink_kernel_release(net->xfrm.nlsk_stash);
3355 }
3356
3357 static struct pernet_operations xfrm_user_net_ops = {
3358 .init = xfrm_user_net_init,
3359 .exit_batch = xfrm_user_net_exit,
3360 };
3361
3362 static int __init xfrm_user_init(void)
3363 {
3364 int rv;
3365
3366 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3367
3368 rv = register_pernet_subsys(&xfrm_user_net_ops);
3369 if (rv < 0)
3370 return rv;
3371 rv = xfrm_register_km(&netlink_mgr);
3372 if (rv < 0)
3373 unregister_pernet_subsys(&xfrm_user_net_ops);
3374 return rv;
3375 }
3376
3377 static void __exit xfrm_user_exit(void)
3378 {
3379 xfrm_unregister_km(&netlink_mgr);
3380 unregister_pernet_subsys(&xfrm_user_net_ops);
3381 }
3382
3383 module_init(xfrm_user_init);
3384 module_exit(xfrm_user_exit);
3385 MODULE_LICENSE("GPL");
3386 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
Linux with added FPC-III support