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sysfs/cpu: Add vulnerability folder
[linux/fpc-iii.git] / net / xfrm / xfrm_user.c
blob76944a4839a57ee7690b48ca907d2a25d86e4e52
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <asm/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 #include <asm/unaligned.h>
35
36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
37 {
38 struct nlattr *rt = attrs[type];
39 struct xfrm_algo *algp;
40
41 if (!rt)
42 return 0;
43
44 algp = nla_data(rt);
45 if (nla_len(rt) < xfrm_alg_len(algp))
46 return -EINVAL;
47
48 switch (type) {
49 case XFRMA_ALG_AUTH:
50 case XFRMA_ALG_CRYPT:
51 case XFRMA_ALG_COMP:
52 break;
53
54 default:
55 return -EINVAL;
56 }
57
58 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
59 return 0;
60 }
61
62 static int verify_auth_trunc(struct nlattr **attrs)
63 {
64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
65 struct xfrm_algo_auth *algp;
66
67 if (!rt)
68 return 0;
69
70 algp = nla_data(rt);
71 if (nla_len(rt) < xfrm_alg_auth_len(algp))
72 return -EINVAL;
73
74 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
75 return 0;
76 }
77
78 static int verify_aead(struct nlattr **attrs)
79 {
80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
81 struct xfrm_algo_aead *algp;
82
83 if (!rt)
84 return 0;
85
86 algp = nla_data(rt);
87 if (nla_len(rt) < aead_len(algp))
88 return -EINVAL;
89
90 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
91 return 0;
92 }
93
94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
95 xfrm_address_t **addrp)
96 {
97 struct nlattr *rt = attrs[type];
98
99 if (rt && addrp)
100 *addrp = nla_data(rt);
101 }
102
103 static inline int verify_sec_ctx_len(struct nlattr **attrs)
104 {
105 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
106 struct xfrm_user_sec_ctx *uctx;
107
108 if (!rt)
109 return 0;
110
111 uctx = nla_data(rt);
112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
113 return -EINVAL;
114
115 return 0;
116 }
117
118 static inline int verify_replay(struct xfrm_usersa_info *p,
119 struct nlattr **attrs)
120 {
121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
122 struct xfrm_replay_state_esn *rs;
123
124 if (p->flags & XFRM_STATE_ESN) {
125 if (!rt)
126 return -EINVAL;
127
128 rs = nla_data(rt);
129
130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
131 return -EINVAL;
132
133 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
134 nla_len(rt) != sizeof(*rs))
135 return -EINVAL;
136 }
137
138 if (!rt)
139 return 0;
140
141 /* As only ESP and AH support ESN feature. */
142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
143 return -EINVAL;
144
145 if (p->replay_window != 0)
146 return -EINVAL;
147
148 return 0;
149 }
150
151 static int verify_newsa_info(struct xfrm_usersa_info *p,
152 struct nlattr **attrs)
153 {
154 int err;
155
156 err = -EINVAL;
157 switch (p->family) {
158 case AF_INET:
159 break;
160
161 case AF_INET6:
162 #if IS_ENABLED(CONFIG_IPV6)
163 break;
164 #else
165 err = -EAFNOSUPPORT;
166 goto out;
167 #endif
168
169 default:
170 goto out;
171 }
172
173 err = -EINVAL;
174 switch (p->id.proto) {
175 case IPPROTO_AH:
176 if ((!attrs[XFRMA_ALG_AUTH] &&
177 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
178 attrs[XFRMA_ALG_AEAD] ||
179 attrs[XFRMA_ALG_CRYPT] ||
180 attrs[XFRMA_ALG_COMP] ||
181 attrs[XFRMA_TFCPAD])
182 goto out;
183 break;
184
185 case IPPROTO_ESP:
186 if (attrs[XFRMA_ALG_COMP])
187 goto out;
188 if (!attrs[XFRMA_ALG_AUTH] &&
189 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
190 !attrs[XFRMA_ALG_CRYPT] &&
191 !attrs[XFRMA_ALG_AEAD])
192 goto out;
193 if ((attrs[XFRMA_ALG_AUTH] ||
194 attrs[XFRMA_ALG_AUTH_TRUNC] ||
195 attrs[XFRMA_ALG_CRYPT]) &&
196 attrs[XFRMA_ALG_AEAD])
197 goto out;
198 if (attrs[XFRMA_TFCPAD] &&
199 p->mode != XFRM_MODE_TUNNEL)
200 goto out;
201 break;
202
203 case IPPROTO_COMP:
204 if (!attrs[XFRMA_ALG_COMP] ||
205 attrs[XFRMA_ALG_AEAD] ||
206 attrs[XFRMA_ALG_AUTH] ||
207 attrs[XFRMA_ALG_AUTH_TRUNC] ||
208 attrs[XFRMA_ALG_CRYPT] ||
209 attrs[XFRMA_TFCPAD] ||
210 (ntohl(p->id.spi) >= 0x10000))
211 goto out;
212 break;
213
214 #if IS_ENABLED(CONFIG_IPV6)
215 case IPPROTO_DSTOPTS:
216 case IPPROTO_ROUTING:
217 if (attrs[XFRMA_ALG_COMP] ||
218 attrs[XFRMA_ALG_AUTH] ||
219 attrs[XFRMA_ALG_AUTH_TRUNC] ||
220 attrs[XFRMA_ALG_AEAD] ||
221 attrs[XFRMA_ALG_CRYPT] ||
222 attrs[XFRMA_ENCAP] ||
223 attrs[XFRMA_SEC_CTX] ||
224 attrs[XFRMA_TFCPAD] ||
225 !attrs[XFRMA_COADDR])
226 goto out;
227 break;
228 #endif
229
230 default:
231 goto out;
232 }
233
234 if ((err = verify_aead(attrs)))
235 goto out;
236 if ((err = verify_auth_trunc(attrs)))
237 goto out;
238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
239 goto out;
240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
241 goto out;
242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
243 goto out;
244 if ((err = verify_sec_ctx_len(attrs)))
245 goto out;
246 if ((err = verify_replay(p, attrs)))
247 goto out;
248
249 err = -EINVAL;
250 switch (p->mode) {
251 case XFRM_MODE_TRANSPORT:
252 case XFRM_MODE_TUNNEL:
253 case XFRM_MODE_ROUTEOPTIMIZATION:
254 case XFRM_MODE_BEET:
255 break;
256
257 default:
258 goto out;
259 }
260
261 err = 0;
262
263 out:
264 return err;
265 }
266
267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
268 struct xfrm_algo_desc *(*get_byname)(const char *, int),
269 struct nlattr *rta)
270 {
271 struct xfrm_algo *p, *ualg;
272 struct xfrm_algo_desc *algo;
273
274 if (!rta)
275 return 0;
276
277 ualg = nla_data(rta);
278
279 algo = get_byname(ualg->alg_name, 1);
280 if (!algo)
281 return -ENOSYS;
282 *props = algo->desc.sadb_alg_id;
283
284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
285 if (!p)
286 return -ENOMEM;
287
288 strcpy(p->alg_name, algo->name);
289 *algpp = p;
290 return 0;
291 }
292
293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
294 {
295 struct xfrm_algo *p, *ualg;
296 struct xfrm_algo_desc *algo;
297
298 if (!rta)
299 return 0;
300
301 ualg = nla_data(rta);
302
303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
304 if (!algo)
305 return -ENOSYS;
306 x->props.ealgo = algo->desc.sadb_alg_id;
307
308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
309 if (!p)
310 return -ENOMEM;
311
312 strcpy(p->alg_name, algo->name);
313 x->ealg = p;
314 x->geniv = algo->uinfo.encr.geniv;
315 return 0;
316 }
317
318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
319 struct nlattr *rta)
320 {
321 struct xfrm_algo *ualg;
322 struct xfrm_algo_auth *p;
323 struct xfrm_algo_desc *algo;
324
325 if (!rta)
326 return 0;
327
328 ualg = nla_data(rta);
329
330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
331 if (!algo)
332 return -ENOSYS;
333 *props = algo->desc.sadb_alg_id;
334
335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
336 if (!p)
337 return -ENOMEM;
338
339 strcpy(p->alg_name, algo->name);
340 p->alg_key_len = ualg->alg_key_len;
341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
343
344 *algpp = p;
345 return 0;
346 }
347
348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
349 struct nlattr *rta)
350 {
351 struct xfrm_algo_auth *p, *ualg;
352 struct xfrm_algo_desc *algo;
353
354 if (!rta)
355 return 0;
356
357 ualg = nla_data(rta);
358
359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
360 if (!algo)
361 return -ENOSYS;
362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
363 return -EINVAL;
364 *props = algo->desc.sadb_alg_id;
365
366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
367 if (!p)
368 return -ENOMEM;
369
370 strcpy(p->alg_name, algo->name);
371 if (!p->alg_trunc_len)
372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
373
374 *algpp = p;
375 return 0;
376 }
377
378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
379 {
380 struct xfrm_algo_aead *p, *ualg;
381 struct xfrm_algo_desc *algo;
382
383 if (!rta)
384 return 0;
385
386 ualg = nla_data(rta);
387
388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
389 if (!algo)
390 return -ENOSYS;
391 x->props.ealgo = algo->desc.sadb_alg_id;
392
393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
394 if (!p)
395 return -ENOMEM;
396
397 strcpy(p->alg_name, algo->name);
398 x->aead = p;
399 x->geniv = algo->uinfo.aead.geniv;
400 return 0;
401 }
402
403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
404 struct nlattr *rp)
405 {
406 struct xfrm_replay_state_esn *up;
407 int ulen;
408
409 if (!replay_esn || !rp)
410 return 0;
411
412 up = nla_data(rp);
413 ulen = xfrm_replay_state_esn_len(up);
414
415 /* Check the overall length and the internal bitmap length to avoid
416 * potential overflow. */
417 if (nla_len(rp) < ulen ||
418 xfrm_replay_state_esn_len(replay_esn) != ulen ||
419 replay_esn->bmp_len != up->bmp_len)
420 return -EINVAL;
421
422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
423 return -EINVAL;
424
425 return 0;
426 }
427
428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
429 struct xfrm_replay_state_esn **preplay_esn,
430 struct nlattr *rta)
431 {
432 struct xfrm_replay_state_esn *p, *pp, *up;
433 int klen, ulen;
434
435 if (!rta)
436 return 0;
437
438 up = nla_data(rta);
439 klen = xfrm_replay_state_esn_len(up);
440 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
441
442 p = kzalloc(klen, GFP_KERNEL);
443 if (!p)
444 return -ENOMEM;
445
446 pp = kzalloc(klen, GFP_KERNEL);
447 if (!pp) {
448 kfree(p);
449 return -ENOMEM;
450 }
451
452 memcpy(p, up, ulen);
453 memcpy(pp, up, ulen);
454
455 *replay_esn = p;
456 *preplay_esn = pp;
457
458 return 0;
459 }
460
461 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
462 {
463 int len = 0;
464
465 if (xfrm_ctx) {
466 len += sizeof(struct xfrm_user_sec_ctx);
467 len += xfrm_ctx->ctx_len;
468 }
469 return len;
470 }
471
472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
473 {
474 memcpy(&x->id, &p->id, sizeof(x->id));
475 memcpy(&x->sel, &p->sel, sizeof(x->sel));
476 memcpy(&x->lft, &p->lft, sizeof(x->lft));
477 x->props.mode = p->mode;
478 x->props.replay_window = min_t(unsigned int, p->replay_window,
479 sizeof(x->replay.bitmap) * 8);
480 x->props.reqid = p->reqid;
481 x->props.family = p->family;
482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
483 x->props.flags = p->flags;
484
485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
486 x->sel.family = p->family;
487 }
488
489 /*
490 * someday when pfkey also has support, we could have the code
491 * somehow made shareable and move it to xfrm_state.c - JHS
492 *
493 */
494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
495 int update_esn)
496 {
497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
502
503 if (re) {
504 struct xfrm_replay_state_esn *replay_esn;
505 replay_esn = nla_data(re);
506 memcpy(x->replay_esn, replay_esn,
507 xfrm_replay_state_esn_len(replay_esn));
508 memcpy(x->preplay_esn, replay_esn,
509 xfrm_replay_state_esn_len(replay_esn));
510 }
511
512 if (rp) {
513 struct xfrm_replay_state *replay;
514 replay = nla_data(rp);
515 memcpy(&x->replay, replay, sizeof(*replay));
516 memcpy(&x->preplay, replay, sizeof(*replay));
517 }
518
519 if (lt) {
520 struct xfrm_lifetime_cur *ltime;
521 ltime = nla_data(lt);
522 x->curlft.bytes = ltime->bytes;
523 x->curlft.packets = ltime->packets;
524 x->curlft.add_time = ltime->add_time;
525 x->curlft.use_time = ltime->use_time;
526 }
527
528 if (et)
529 x->replay_maxage = nla_get_u32(et);
530
531 if (rt)
532 x->replay_maxdiff = nla_get_u32(rt);
533 }
534
535 static struct xfrm_state *xfrm_state_construct(struct net *net,
536 struct xfrm_usersa_info *p,
537 struct nlattr **attrs,
538 int *errp)
539 {
540 struct xfrm_state *x = xfrm_state_alloc(net);
541 int err = -ENOMEM;
542
543 if (!x)
544 goto error_no_put;
545
546 copy_from_user_state(x, p);
547
548 if (attrs[XFRMA_SA_EXTRA_FLAGS])
549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
550
551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
552 goto error;
553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
554 attrs[XFRMA_ALG_AUTH_TRUNC])))
555 goto error;
556 if (!x->props.aalgo) {
557 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
558 attrs[XFRMA_ALG_AUTH])))
559 goto error;
560 }
561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
562 goto error;
563 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
564 xfrm_calg_get_byname,
565 attrs[XFRMA_ALG_COMP])))
566 goto error;
567
568 if (attrs[XFRMA_ENCAP]) {
569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
570 sizeof(*x->encap), GFP_KERNEL);
571 if (x->encap == NULL)
572 goto error;
573 }
574
575 if (attrs[XFRMA_TFCPAD])
576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
577
578 if (attrs[XFRMA_COADDR]) {
579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
580 sizeof(*x->coaddr), GFP_KERNEL);
581 if (x->coaddr == NULL)
582 goto error;
583 }
584
585 xfrm_mark_get(attrs, &x->mark);
586
587 err = __xfrm_init_state(x, false);
588 if (err)
589 goto error;
590
591 if (attrs[XFRMA_SEC_CTX] &&
592 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
593 goto error;
594
595 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
596 attrs[XFRMA_REPLAY_ESN_VAL])))
597 goto error;
598
599 x->km.seq = p->seq;
600 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
601 /* sysctl_xfrm_aevent_etime is in 100ms units */
602 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
603
604 if ((err = xfrm_init_replay(x)))
605 goto error;
606
607 /* override default values from above */
608 xfrm_update_ae_params(x, attrs, 0);
609
610 return x;
611
612 error:
613 x->km.state = XFRM_STATE_DEAD;
614 xfrm_state_put(x);
615 error_no_put:
616 *errp = err;
617 return NULL;
618 }
619
620 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
621 struct nlattr **attrs)
622 {
623 struct net *net = sock_net(skb->sk);
624 struct xfrm_usersa_info *p = nlmsg_data(nlh);
625 struct xfrm_state *x;
626 int err;
627 struct km_event c;
628
629 err = verify_newsa_info(p, attrs);
630 if (err)
631 return err;
632
633 x = xfrm_state_construct(net, p, attrs, &err);
634 if (!x)
635 return err;
636
637 xfrm_state_hold(x);
638 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
639 err = xfrm_state_add(x);
640 else
641 err = xfrm_state_update(x);
642
643 xfrm_audit_state_add(x, err ? 0 : 1, true);
644
645 if (err < 0) {
646 x->km.state = XFRM_STATE_DEAD;
647 __xfrm_state_put(x);
648 goto out;
649 }
650
651 c.seq = nlh->nlmsg_seq;
652 c.portid = nlh->nlmsg_pid;
653 c.event = nlh->nlmsg_type;
654
655 km_state_notify(x, &c);
656 out:
657 xfrm_state_put(x);
658 return err;
659 }
660
661 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
662 struct xfrm_usersa_id *p,
663 struct nlattr **attrs,
664 int *errp)
665 {
666 struct xfrm_state *x = NULL;
667 struct xfrm_mark m;
668 int err;
669 u32 mark = xfrm_mark_get(attrs, &m);
670
671 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
672 err = -ESRCH;
673 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
674 } else {
675 xfrm_address_t *saddr = NULL;
676
677 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
678 if (!saddr) {
679 err = -EINVAL;
680 goto out;
681 }
682
683 err = -ESRCH;
684 x = xfrm_state_lookup_byaddr(net, mark,
685 &p->daddr, saddr,
686 p->proto, p->family);
687 }
688
689 out:
690 if (!x && errp)
691 *errp = err;
692 return x;
693 }
694
695 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
696 struct nlattr **attrs)
697 {
698 struct net *net = sock_net(skb->sk);
699 struct xfrm_state *x;
700 int err = -ESRCH;
701 struct km_event c;
702 struct xfrm_usersa_id *p = nlmsg_data(nlh);
703
704 x = xfrm_user_state_lookup(net, p, attrs, &err);
705 if (x == NULL)
706 return err;
707
708 if ((err = security_xfrm_state_delete(x)) != 0)
709 goto out;
710
711 if (xfrm_state_kern(x)) {
712 err = -EPERM;
713 goto out;
714 }
715
716 err = xfrm_state_delete(x);
717
718 if (err < 0)
719 goto out;
720
721 c.seq = nlh->nlmsg_seq;
722 c.portid = nlh->nlmsg_pid;
723 c.event = nlh->nlmsg_type;
724 km_state_notify(x, &c);
725
726 out:
727 xfrm_audit_state_delete(x, err ? 0 : 1, true);
728 xfrm_state_put(x);
729 return err;
730 }
731
732 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
733 {
734 memset(p, 0, sizeof(*p));
735 memcpy(&p->id, &x->id, sizeof(p->id));
736 memcpy(&p->sel, &x->sel, sizeof(p->sel));
737 memcpy(&p->lft, &x->lft, sizeof(p->lft));
738 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
739 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
740 put_unaligned(x->stats.replay, &p->stats.replay);
741 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
742 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
743 p->mode = x->props.mode;
744 p->replay_window = x->props.replay_window;
745 p->reqid = x->props.reqid;
746 p->family = x->props.family;
747 p->flags = x->props.flags;
748 p->seq = x->km.seq;
749 }
750
751 struct xfrm_dump_info {
752 struct sk_buff *in_skb;
753 struct sk_buff *out_skb;
754 u32 nlmsg_seq;
755 u16 nlmsg_flags;
756 };
757
758 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
759 {
760 struct xfrm_user_sec_ctx *uctx;
761 struct nlattr *attr;
762 int ctx_size = sizeof(*uctx) + s->ctx_len;
763
764 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
765 if (attr == NULL)
766 return -EMSGSIZE;
767
768 uctx = nla_data(attr);
769 uctx->exttype = XFRMA_SEC_CTX;
770 uctx->len = ctx_size;
771 uctx->ctx_doi = s->ctx_doi;
772 uctx->ctx_alg = s->ctx_alg;
773 uctx->ctx_len = s->ctx_len;
774 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
775
776 return 0;
777 }
778
779 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
780 {
781 struct xfrm_algo *algo;
782 struct nlattr *nla;
783
784 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
785 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
786 if (!nla)
787 return -EMSGSIZE;
788
789 algo = nla_data(nla);
790 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
791 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
792 algo->alg_key_len = auth->alg_key_len;
793
794 return 0;
795 }
796
797 /* Don't change this without updating xfrm_sa_len! */
798 static int copy_to_user_state_extra(struct xfrm_state *x,
799 struct xfrm_usersa_info *p,
800 struct sk_buff *skb)
801 {
802 int ret = 0;
803
804 copy_to_user_state(x, p);
805
806 if (x->props.extra_flags) {
807 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
808 x->props.extra_flags);
809 if (ret)
810 goto out;
811 }
812
813 if (x->coaddr) {
814 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
815 if (ret)
816 goto out;
817 }
818 if (x->lastused) {
819 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
820 if (ret)
821 goto out;
822 }
823 if (x->aead) {
824 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
825 if (ret)
826 goto out;
827 }
828 if (x->aalg) {
829 ret = copy_to_user_auth(x->aalg, skb);
830 if (!ret)
831 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
832 xfrm_alg_auth_len(x->aalg), x->aalg);
833 if (ret)
834 goto out;
835 }
836 if (x->ealg) {
837 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
838 if (ret)
839 goto out;
840 }
841 if (x->calg) {
842 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
843 if (ret)
844 goto out;
845 }
846 if (x->encap) {
847 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
848 if (ret)
849 goto out;
850 }
851 if (x->tfcpad) {
852 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
853 if (ret)
854 goto out;
855 }
856 ret = xfrm_mark_put(skb, &x->mark);
857 if (ret)
858 goto out;
859 if (x->replay_esn)
860 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
861 xfrm_replay_state_esn_len(x->replay_esn),
862 x->replay_esn);
863 else
864 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
865 &x->replay);
866 if (ret)
867 goto out;
868 if (x->security)
869 ret = copy_sec_ctx(x->security, skb);
870 out:
871 return ret;
872 }
873
874 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
875 {
876 struct xfrm_dump_info *sp = ptr;
877 struct sk_buff *in_skb = sp->in_skb;
878 struct sk_buff *skb = sp->out_skb;
879 struct xfrm_usersa_info *p;
880 struct nlmsghdr *nlh;
881 int err;
882
883 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
884 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
885 if (nlh == NULL)
886 return -EMSGSIZE;
887
888 p = nlmsg_data(nlh);
889
890 err = copy_to_user_state_extra(x, p, skb);
891 if (err) {
892 nlmsg_cancel(skb, nlh);
893 return err;
894 }
895 nlmsg_end(skb, nlh);
896 return 0;
897 }
898
899 static int xfrm_dump_sa_done(struct netlink_callback *cb)
900 {
901 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
902 struct sock *sk = cb->skb->sk;
903 struct net *net = sock_net(sk);
904
905 xfrm_state_walk_done(walk, net);
906 return 0;
907 }
908
909 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
910 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
911 {
912 struct net *net = sock_net(skb->sk);
913 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
914 struct xfrm_dump_info info;
915
916 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
917 sizeof(cb->args) - sizeof(cb->args[0]));
918
919 info.in_skb = cb->skb;
920 info.out_skb = skb;
921 info.nlmsg_seq = cb->nlh->nlmsg_seq;
922 info.nlmsg_flags = NLM_F_MULTI;
923
924 if (!cb->args[0]) {
925 struct nlattr *attrs[XFRMA_MAX+1];
926 struct xfrm_address_filter *filter = NULL;
927 u8 proto = 0;
928 int err;
929
930 cb->args[0] = 1;
931
932 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
933 xfrma_policy);
934 if (err < 0)
935 return err;
936
937 if (attrs[XFRMA_ADDRESS_FILTER]) {
938 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
939 sizeof(*filter), GFP_KERNEL);
940 if (filter == NULL)
941 return -ENOMEM;
942 }
943
944 if (attrs[XFRMA_PROTO])
945 proto = nla_get_u8(attrs[XFRMA_PROTO]);
946
947 xfrm_state_walk_init(walk, proto, filter);
948 }
949
950 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
951
952 return skb->len;
953 }
954
955 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
956 struct xfrm_state *x, u32 seq)
957 {
958 struct xfrm_dump_info info;
959 struct sk_buff *skb;
960 int err;
961
962 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
963 if (!skb)
964 return ERR_PTR(-ENOMEM);
965
966 info.in_skb = in_skb;
967 info.out_skb = skb;
968 info.nlmsg_seq = seq;
969 info.nlmsg_flags = 0;
970
971 err = dump_one_state(x, 0, &info);
972 if (err) {
973 kfree_skb(skb);
974 return ERR_PTR(err);
975 }
976
977 return skb;
978 }
979
980 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
981 * Must be called with RCU read lock.
982 */
983 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
984 u32 pid, unsigned int group)
985 {
986 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
987
988 if (nlsk)
989 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
990 else
991 return -1;
992 }
993
994 static inline size_t xfrm_spdinfo_msgsize(void)
995 {
996 return NLMSG_ALIGN(4)
997 + nla_total_size(sizeof(struct xfrmu_spdinfo))
998 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
999 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1000 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1001 }
1002
1003 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1004 u32 portid, u32 seq, u32 flags)
1005 {
1006 struct xfrmk_spdinfo si;
1007 struct xfrmu_spdinfo spc;
1008 struct xfrmu_spdhinfo sph;
1009 struct xfrmu_spdhthresh spt4, spt6;
1010 struct nlmsghdr *nlh;
1011 int err;
1012 u32 *f;
1013 unsigned lseq;
1014
1015 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1016 if (nlh == NULL) /* shouldn't really happen ... */
1017 return -EMSGSIZE;
1018
1019 f = nlmsg_data(nlh);
1020 *f = flags;
1021 xfrm_spd_getinfo(net, &si);
1022 spc.incnt = si.incnt;
1023 spc.outcnt = si.outcnt;
1024 spc.fwdcnt = si.fwdcnt;
1025 spc.inscnt = si.inscnt;
1026 spc.outscnt = si.outscnt;
1027 spc.fwdscnt = si.fwdscnt;
1028 sph.spdhcnt = si.spdhcnt;
1029 sph.spdhmcnt = si.spdhmcnt;
1030
1031 do {
1032 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1033
1034 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1035 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1036 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1037 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1038 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1039
1040 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1041 if (!err)
1042 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1043 if (!err)
1044 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1045 if (!err)
1046 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1047 if (err) {
1048 nlmsg_cancel(skb, nlh);
1049 return err;
1050 }
1051
1052 nlmsg_end(skb, nlh);
1053 return 0;
1054 }
1055
1056 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1057 struct nlattr **attrs)
1058 {
1059 struct net *net = sock_net(skb->sk);
1060 struct xfrmu_spdhthresh *thresh4 = NULL;
1061 struct xfrmu_spdhthresh *thresh6 = NULL;
1062
1063 /* selector prefixlen thresholds to hash policies */
1064 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1065 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1066
1067 if (nla_len(rta) < sizeof(*thresh4))
1068 return -EINVAL;
1069 thresh4 = nla_data(rta);
1070 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1071 return -EINVAL;
1072 }
1073 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1074 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1075
1076 if (nla_len(rta) < sizeof(*thresh6))
1077 return -EINVAL;
1078 thresh6 = nla_data(rta);
1079 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1080 return -EINVAL;
1081 }
1082
1083 if (thresh4 || thresh6) {
1084 write_seqlock(&net->xfrm.policy_hthresh.lock);
1085 if (thresh4) {
1086 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1087 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1088 }
1089 if (thresh6) {
1090 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1091 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1092 }
1093 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1094
1095 xfrm_policy_hash_rebuild(net);
1096 }
1097
1098 return 0;
1099 }
1100
1101 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1102 struct nlattr **attrs)
1103 {
1104 struct net *net = sock_net(skb->sk);
1105 struct sk_buff *r_skb;
1106 u32 *flags = nlmsg_data(nlh);
1107 u32 sportid = NETLINK_CB(skb).portid;
1108 u32 seq = nlh->nlmsg_seq;
1109
1110 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1111 if (r_skb == NULL)
1112 return -ENOMEM;
1113
1114 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1115 BUG();
1116
1117 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1118 }
1119
1120 static inline size_t xfrm_sadinfo_msgsize(void)
1121 {
1122 return NLMSG_ALIGN(4)
1123 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1124 + nla_total_size(4); /* XFRMA_SAD_CNT */
1125 }
1126
1127 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1128 u32 portid, u32 seq, u32 flags)
1129 {
1130 struct xfrmk_sadinfo si;
1131 struct xfrmu_sadhinfo sh;
1132 struct nlmsghdr *nlh;
1133 int err;
1134 u32 *f;
1135
1136 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1137 if (nlh == NULL) /* shouldn't really happen ... */
1138 return -EMSGSIZE;
1139
1140 f = nlmsg_data(nlh);
1141 *f = flags;
1142 xfrm_sad_getinfo(net, &si);
1143
1144 sh.sadhmcnt = si.sadhmcnt;
1145 sh.sadhcnt = si.sadhcnt;
1146
1147 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1148 if (!err)
1149 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1150 if (err) {
1151 nlmsg_cancel(skb, nlh);
1152 return err;
1153 }
1154
1155 nlmsg_end(skb, nlh);
1156 return 0;
1157 }
1158
1159 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1160 struct nlattr **attrs)
1161 {
1162 struct net *net = sock_net(skb->sk);
1163 struct sk_buff *r_skb;
1164 u32 *flags = nlmsg_data(nlh);
1165 u32 sportid = NETLINK_CB(skb).portid;
1166 u32 seq = nlh->nlmsg_seq;
1167
1168 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1169 if (r_skb == NULL)
1170 return -ENOMEM;
1171
1172 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1173 BUG();
1174
1175 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1176 }
1177
1178 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1179 struct nlattr **attrs)
1180 {
1181 struct net *net = sock_net(skb->sk);
1182 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1183 struct xfrm_state *x;
1184 struct sk_buff *resp_skb;
1185 int err = -ESRCH;
1186
1187 x = xfrm_user_state_lookup(net, p, attrs, &err);
1188 if (x == NULL)
1189 goto out_noput;
1190
1191 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1192 if (IS_ERR(resp_skb)) {
1193 err = PTR_ERR(resp_skb);
1194 } else {
1195 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1196 }
1197 xfrm_state_put(x);
1198 out_noput:
1199 return err;
1200 }
1201
1202 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1203 struct nlattr **attrs)
1204 {
1205 struct net *net = sock_net(skb->sk);
1206 struct xfrm_state *x;
1207 struct xfrm_userspi_info *p;
1208 struct sk_buff *resp_skb;
1209 xfrm_address_t *daddr;
1210 int family;
1211 int err;
1212 u32 mark;
1213 struct xfrm_mark m;
1214
1215 p = nlmsg_data(nlh);
1216 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1217 if (err)
1218 goto out_noput;
1219
1220 family = p->info.family;
1221 daddr = &p->info.id.daddr;
1222
1223 x = NULL;
1224
1225 mark = xfrm_mark_get(attrs, &m);
1226 if (p->info.seq) {
1227 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1228 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1229 xfrm_state_put(x);
1230 x = NULL;
1231 }
1232 }
1233
1234 if (!x)
1235 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1236 p->info.id.proto, daddr,
1237 &p->info.saddr, 1,
1238 family);
1239 err = -ENOENT;
1240 if (x == NULL)
1241 goto out_noput;
1242
1243 err = xfrm_alloc_spi(x, p->min, p->max);
1244 if (err)
1245 goto out;
1246
1247 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1248 if (IS_ERR(resp_skb)) {
1249 err = PTR_ERR(resp_skb);
1250 goto out;
1251 }
1252
1253 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1254
1255 out:
1256 xfrm_state_put(x);
1257 out_noput:
1258 return err;
1259 }
1260
1261 static int verify_policy_dir(u8 dir)
1262 {
1263 switch (dir) {
1264 case XFRM_POLICY_IN:
1265 case XFRM_POLICY_OUT:
1266 case XFRM_POLICY_FWD:
1267 break;
1268
1269 default:
1270 return -EINVAL;
1271 }
1272
1273 return 0;
1274 }
1275
1276 static int verify_policy_type(u8 type)
1277 {
1278 switch (type) {
1279 case XFRM_POLICY_TYPE_MAIN:
1280 #ifdef CONFIG_XFRM_SUB_POLICY
1281 case XFRM_POLICY_TYPE_SUB:
1282 #endif
1283 break;
1284
1285 default:
1286 return -EINVAL;
1287 }
1288
1289 return 0;
1290 }
1291
1292 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1293 {
1294 int ret;
1295
1296 switch (p->share) {
1297 case XFRM_SHARE_ANY:
1298 case XFRM_SHARE_SESSION:
1299 case XFRM_SHARE_USER:
1300 case XFRM_SHARE_UNIQUE:
1301 break;
1302
1303 default:
1304 return -EINVAL;
1305 }
1306
1307 switch (p->action) {
1308 case XFRM_POLICY_ALLOW:
1309 case XFRM_POLICY_BLOCK:
1310 break;
1311
1312 default:
1313 return -EINVAL;
1314 }
1315
1316 switch (p->sel.family) {
1317 case AF_INET:
1318 break;
1319
1320 case AF_INET6:
1321 #if IS_ENABLED(CONFIG_IPV6)
1322 break;
1323 #else
1324 return -EAFNOSUPPORT;
1325 #endif
1326
1327 default:
1328 return -EINVAL;
1329 }
1330
1331 ret = verify_policy_dir(p->dir);
1332 if (ret)
1333 return ret;
1334 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1335 return -EINVAL;
1336
1337 return 0;
1338 }
1339
1340 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1341 {
1342 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1343 struct xfrm_user_sec_ctx *uctx;
1344
1345 if (!rt)
1346 return 0;
1347
1348 uctx = nla_data(rt);
1349 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1350 }
1351
1352 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1353 int nr)
1354 {
1355 int i;
1356
1357 xp->xfrm_nr = nr;
1358 for (i = 0; i < nr; i++, ut++) {
1359 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1360
1361 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1362 memcpy(&t->saddr, &ut->saddr,
1363 sizeof(xfrm_address_t));
1364 t->reqid = ut->reqid;
1365 t->mode = ut->mode;
1366 t->share = ut->share;
1367 t->optional = ut->optional;
1368 t->aalgos = ut->aalgos;
1369 t->ealgos = ut->ealgos;
1370 t->calgos = ut->calgos;
1371 /* If all masks are ~0, then we allow all algorithms. */
1372 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1373 t->encap_family = ut->family;
1374 }
1375 }
1376
1377 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1378 {
1379 int i;
1380
1381 if (nr > XFRM_MAX_DEPTH)
1382 return -EINVAL;
1383
1384 for (i = 0; i < nr; i++) {
1385 /* We never validated the ut->family value, so many
1386 * applications simply leave it at zero. The check was
1387 * never made and ut->family was ignored because all
1388 * templates could be assumed to have the same family as
1389 * the policy itself. Now that we will have ipv4-in-ipv6
1390 * and ipv6-in-ipv4 tunnels, this is no longer true.
1391 */
1392 if (!ut[i].family)
1393 ut[i].family = family;
1394
1395 switch (ut[i].family) {
1396 case AF_INET:
1397 break;
1398 #if IS_ENABLED(CONFIG_IPV6)
1399 case AF_INET6:
1400 break;
1401 #endif
1402 default:
1403 return -EINVAL;
1404 }
1405 }
1406
1407 return 0;
1408 }
1409
1410 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1411 {
1412 struct nlattr *rt = attrs[XFRMA_TMPL];
1413
1414 if (!rt) {
1415 pol->xfrm_nr = 0;
1416 } else {
1417 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1418 int nr = nla_len(rt) / sizeof(*utmpl);
1419 int err;
1420
1421 err = validate_tmpl(nr, utmpl, pol->family);
1422 if (err)
1423 return err;
1424
1425 copy_templates(pol, utmpl, nr);
1426 }
1427 return 0;
1428 }
1429
1430 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1431 {
1432 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1433 struct xfrm_userpolicy_type *upt;
1434 u8 type = XFRM_POLICY_TYPE_MAIN;
1435 int err;
1436
1437 if (rt) {
1438 upt = nla_data(rt);
1439 type = upt->type;
1440 }
1441
1442 err = verify_policy_type(type);
1443 if (err)
1444 return err;
1445
1446 *tp = type;
1447 return 0;
1448 }
1449
1450 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1451 {
1452 xp->priority = p->priority;
1453 xp->index = p->index;
1454 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1455 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1456 xp->action = p->action;
1457 xp->flags = p->flags;
1458 xp->family = p->sel.family;
1459 /* XXX xp->share = p->share; */
1460 }
1461
1462 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1463 {
1464 memset(p, 0, sizeof(*p));
1465 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1466 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1467 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1468 p->priority = xp->priority;
1469 p->index = xp->index;
1470 p->sel.family = xp->family;
1471 p->dir = dir;
1472 p->action = xp->action;
1473 p->flags = xp->flags;
1474 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1475 }
1476
1477 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1478 {
1479 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1480 int err;
1481
1482 if (!xp) {
1483 *errp = -ENOMEM;
1484 return NULL;
1485 }
1486
1487 copy_from_user_policy(xp, p);
1488
1489 err = copy_from_user_policy_type(&xp->type, attrs);
1490 if (err)
1491 goto error;
1492
1493 if (!(err = copy_from_user_tmpl(xp, attrs)))
1494 err = copy_from_user_sec_ctx(xp, attrs);
1495 if (err)
1496 goto error;
1497
1498 xfrm_mark_get(attrs, &xp->mark);
1499
1500 return xp;
1501 error:
1502 *errp = err;
1503 xp->walk.dead = 1;
1504 xfrm_policy_destroy(xp);
1505 return NULL;
1506 }
1507
1508 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1509 struct nlattr **attrs)
1510 {
1511 struct net *net = sock_net(skb->sk);
1512 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1513 struct xfrm_policy *xp;
1514 struct km_event c;
1515 int err;
1516 int excl;
1517
1518 err = verify_newpolicy_info(p);
1519 if (err)
1520 return err;
1521 err = verify_sec_ctx_len(attrs);
1522 if (err)
1523 return err;
1524
1525 xp = xfrm_policy_construct(net, p, attrs, &err);
1526 if (!xp)
1527 return err;
1528
1529 /* shouldn't excl be based on nlh flags??
1530 * Aha! this is anti-netlink really i.e more pfkey derived
1531 * in netlink excl is a flag and you wouldnt need
1532 * a type XFRM_MSG_UPDPOLICY - JHS */
1533 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1534 err = xfrm_policy_insert(p->dir, xp, excl);
1535 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1536
1537 if (err) {
1538 security_xfrm_policy_free(xp->security);
1539 kfree(xp);
1540 return err;
1541 }
1542
1543 c.event = nlh->nlmsg_type;
1544 c.seq = nlh->nlmsg_seq;
1545 c.portid = nlh->nlmsg_pid;
1546 km_policy_notify(xp, p->dir, &c);
1547
1548 xfrm_pol_put(xp);
1549
1550 return 0;
1551 }
1552
1553 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1554 {
1555 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1556 int i;
1557
1558 if (xp->xfrm_nr == 0)
1559 return 0;
1560
1561 for (i = 0; i < xp->xfrm_nr; i++) {
1562 struct xfrm_user_tmpl *up = &vec[i];
1563 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1564
1565 memset(up, 0, sizeof(*up));
1566 memcpy(&up->id, &kp->id, sizeof(up->id));
1567 up->family = kp->encap_family;
1568 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1569 up->reqid = kp->reqid;
1570 up->mode = kp->mode;
1571 up->share = kp->share;
1572 up->optional = kp->optional;
1573 up->aalgos = kp->aalgos;
1574 up->ealgos = kp->ealgos;
1575 up->calgos = kp->calgos;
1576 }
1577
1578 return nla_put(skb, XFRMA_TMPL,
1579 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1580 }
1581
1582 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1583 {
1584 if (x->security) {
1585 return copy_sec_ctx(x->security, skb);
1586 }
1587 return 0;
1588 }
1589
1590 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1591 {
1592 if (xp->security)
1593 return copy_sec_ctx(xp->security, skb);
1594 return 0;
1595 }
1596 static inline size_t userpolicy_type_attrsize(void)
1597 {
1598 #ifdef CONFIG_XFRM_SUB_POLICY
1599 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1600 #else
1601 return 0;
1602 #endif
1603 }
1604
1605 #ifdef CONFIG_XFRM_SUB_POLICY
1606 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1607 {
1608 struct xfrm_userpolicy_type upt = {
1609 .type = type,
1610 };
1611
1612 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1613 }
1614
1615 #else
1616 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1617 {
1618 return 0;
1619 }
1620 #endif
1621
1622 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1623 {
1624 struct xfrm_dump_info *sp = ptr;
1625 struct xfrm_userpolicy_info *p;
1626 struct sk_buff *in_skb = sp->in_skb;
1627 struct sk_buff *skb = sp->out_skb;
1628 struct nlmsghdr *nlh;
1629 int err;
1630
1631 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1632 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1633 if (nlh == NULL)
1634 return -EMSGSIZE;
1635
1636 p = nlmsg_data(nlh);
1637 copy_to_user_policy(xp, p, dir);
1638 err = copy_to_user_tmpl(xp, skb);
1639 if (!err)
1640 err = copy_to_user_sec_ctx(xp, skb);
1641 if (!err)
1642 err = copy_to_user_policy_type(xp->type, skb);
1643 if (!err)
1644 err = xfrm_mark_put(skb, &xp->mark);
1645 if (err) {
1646 nlmsg_cancel(skb, nlh);
1647 return err;
1648 }
1649 nlmsg_end(skb, nlh);
1650 return 0;
1651 }
1652
1653 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1654 {
1655 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1656 struct net *net = sock_net(cb->skb->sk);
1657
1658 xfrm_policy_walk_done(walk, net);
1659 return 0;
1660 }
1661
1662 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1663 {
1664 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1665
1666 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1667
1668 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1669 return 0;
1670 }
1671
1672 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1673 {
1674 struct net *net = sock_net(skb->sk);
1675 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1676 struct xfrm_dump_info info;
1677
1678 info.in_skb = cb->skb;
1679 info.out_skb = skb;
1680 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1681 info.nlmsg_flags = NLM_F_MULTI;
1682
1683 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1684
1685 return skb->len;
1686 }
1687
1688 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1689 struct xfrm_policy *xp,
1690 int dir, u32 seq)
1691 {
1692 struct xfrm_dump_info info;
1693 struct sk_buff *skb;
1694 int err;
1695
1696 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1697 if (!skb)
1698 return ERR_PTR(-ENOMEM);
1699
1700 info.in_skb = in_skb;
1701 info.out_skb = skb;
1702 info.nlmsg_seq = seq;
1703 info.nlmsg_flags = 0;
1704
1705 err = dump_one_policy(xp, dir, 0, &info);
1706 if (err) {
1707 kfree_skb(skb);
1708 return ERR_PTR(err);
1709 }
1710
1711 return skb;
1712 }
1713
1714 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1715 struct nlattr **attrs)
1716 {
1717 struct net *net = sock_net(skb->sk);
1718 struct xfrm_policy *xp;
1719 struct xfrm_userpolicy_id *p;
1720 u8 type = XFRM_POLICY_TYPE_MAIN;
1721 int err;
1722 struct km_event c;
1723 int delete;
1724 struct xfrm_mark m;
1725 u32 mark = xfrm_mark_get(attrs, &m);
1726
1727 p = nlmsg_data(nlh);
1728 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1729
1730 err = copy_from_user_policy_type(&type, attrs);
1731 if (err)
1732 return err;
1733
1734 err = verify_policy_dir(p->dir);
1735 if (err)
1736 return err;
1737
1738 if (p->index)
1739 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1740 else {
1741 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1742 struct xfrm_sec_ctx *ctx;
1743
1744 err = verify_sec_ctx_len(attrs);
1745 if (err)
1746 return err;
1747
1748 ctx = NULL;
1749 if (rt) {
1750 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1751
1752 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1753 if (err)
1754 return err;
1755 }
1756 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1757 ctx, delete, &err);
1758 security_xfrm_policy_free(ctx);
1759 }
1760 if (xp == NULL)
1761 return -ENOENT;
1762
1763 if (!delete) {
1764 struct sk_buff *resp_skb;
1765
1766 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1767 if (IS_ERR(resp_skb)) {
1768 err = PTR_ERR(resp_skb);
1769 } else {
1770 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1771 NETLINK_CB(skb).portid);
1772 }
1773 } else {
1774 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1775
1776 if (err != 0)
1777 goto out;
1778
1779 c.data.byid = p->index;
1780 c.event = nlh->nlmsg_type;
1781 c.seq = nlh->nlmsg_seq;
1782 c.portid = nlh->nlmsg_pid;
1783 km_policy_notify(xp, p->dir, &c);
1784 }
1785
1786 out:
1787 xfrm_pol_put(xp);
1788 if (delete && err == 0)
1789 xfrm_garbage_collect(net);
1790 return err;
1791 }
1792
1793 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1794 struct nlattr **attrs)
1795 {
1796 struct net *net = sock_net(skb->sk);
1797 struct km_event c;
1798 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1799 int err;
1800
1801 err = xfrm_state_flush(net, p->proto, true);
1802 if (err) {
1803 if (err == -ESRCH) /* empty table */
1804 return 0;
1805 return err;
1806 }
1807 c.data.proto = p->proto;
1808 c.event = nlh->nlmsg_type;
1809 c.seq = nlh->nlmsg_seq;
1810 c.portid = nlh->nlmsg_pid;
1811 c.net = net;
1812 km_state_notify(NULL, &c);
1813
1814 return 0;
1815 }
1816
1817 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1818 {
1819 size_t replay_size = x->replay_esn ?
1820 xfrm_replay_state_esn_len(x->replay_esn) :
1821 sizeof(struct xfrm_replay_state);
1822
1823 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1824 + nla_total_size(replay_size)
1825 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1826 + nla_total_size(sizeof(struct xfrm_mark))
1827 + nla_total_size(4) /* XFRM_AE_RTHR */
1828 + nla_total_size(4); /* XFRM_AE_ETHR */
1829 }
1830
1831 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1832 {
1833 struct xfrm_aevent_id *id;
1834 struct nlmsghdr *nlh;
1835 int err;
1836
1837 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1838 if (nlh == NULL)
1839 return -EMSGSIZE;
1840
1841 id = nlmsg_data(nlh);
1842 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1843 id->sa_id.spi = x->id.spi;
1844 id->sa_id.family = x->props.family;
1845 id->sa_id.proto = x->id.proto;
1846 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1847 id->reqid = x->props.reqid;
1848 id->flags = c->data.aevent;
1849
1850 if (x->replay_esn) {
1851 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1852 xfrm_replay_state_esn_len(x->replay_esn),
1853 x->replay_esn);
1854 } else {
1855 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1856 &x->replay);
1857 }
1858 if (err)
1859 goto out_cancel;
1860 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1861 if (err)
1862 goto out_cancel;
1863
1864 if (id->flags & XFRM_AE_RTHR) {
1865 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1866 if (err)
1867 goto out_cancel;
1868 }
1869 if (id->flags & XFRM_AE_ETHR) {
1870 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1871 x->replay_maxage * 10 / HZ);
1872 if (err)
1873 goto out_cancel;
1874 }
1875 err = xfrm_mark_put(skb, &x->mark);
1876 if (err)
1877 goto out_cancel;
1878
1879 nlmsg_end(skb, nlh);
1880 return 0;
1881
1882 out_cancel:
1883 nlmsg_cancel(skb, nlh);
1884 return err;
1885 }
1886
1887 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1888 struct nlattr **attrs)
1889 {
1890 struct net *net = sock_net(skb->sk);
1891 struct xfrm_state *x;
1892 struct sk_buff *r_skb;
1893 int err;
1894 struct km_event c;
1895 u32 mark;
1896 struct xfrm_mark m;
1897 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1898 struct xfrm_usersa_id *id = &p->sa_id;
1899
1900 mark = xfrm_mark_get(attrs, &m);
1901
1902 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1903 if (x == NULL)
1904 return -ESRCH;
1905
1906 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1907 if (r_skb == NULL) {
1908 xfrm_state_put(x);
1909 return -ENOMEM;
1910 }
1911
1912 /*
1913 * XXX: is this lock really needed - none of the other
1914 * gets lock (the concern is things getting updated
1915 * while we are still reading) - jhs
1916 */
1917 spin_lock_bh(&x->lock);
1918 c.data.aevent = p->flags;
1919 c.seq = nlh->nlmsg_seq;
1920 c.portid = nlh->nlmsg_pid;
1921
1922 if (build_aevent(r_skb, x, &c) < 0)
1923 BUG();
1924 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1925 spin_unlock_bh(&x->lock);
1926 xfrm_state_put(x);
1927 return err;
1928 }
1929
1930 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1931 struct nlattr **attrs)
1932 {
1933 struct net *net = sock_net(skb->sk);
1934 struct xfrm_state *x;
1935 struct km_event c;
1936 int err = -EINVAL;
1937 u32 mark = 0;
1938 struct xfrm_mark m;
1939 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1940 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1941 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1942 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1943 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1944 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
1945
1946 if (!lt && !rp && !re && !et && !rt)
1947 return err;
1948
1949 /* pedantic mode - thou shalt sayeth replaceth */
1950 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1951 return err;
1952
1953 mark = xfrm_mark_get(attrs, &m);
1954
1955 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1956 if (x == NULL)
1957 return -ESRCH;
1958
1959 if (x->km.state != XFRM_STATE_VALID)
1960 goto out;
1961
1962 err = xfrm_replay_verify_len(x->replay_esn, re);
1963 if (err)
1964 goto out;
1965
1966 spin_lock_bh(&x->lock);
1967 xfrm_update_ae_params(x, attrs, 1);
1968 spin_unlock_bh(&x->lock);
1969
1970 c.event = nlh->nlmsg_type;
1971 c.seq = nlh->nlmsg_seq;
1972 c.portid = nlh->nlmsg_pid;
1973 c.data.aevent = XFRM_AE_CU;
1974 km_state_notify(x, &c);
1975 err = 0;
1976 out:
1977 xfrm_state_put(x);
1978 return err;
1979 }
1980
1981 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1982 struct nlattr **attrs)
1983 {
1984 struct net *net = sock_net(skb->sk);
1985 struct km_event c;
1986 u8 type = XFRM_POLICY_TYPE_MAIN;
1987 int err;
1988
1989 err = copy_from_user_policy_type(&type, attrs);
1990 if (err)
1991 return err;
1992
1993 err = xfrm_policy_flush(net, type, true);
1994 if (err) {
1995 if (err == -ESRCH) /* empty table */
1996 return 0;
1997 return err;
1998 }
1999
2000 c.data.type = type;
2001 c.event = nlh->nlmsg_type;
2002 c.seq = nlh->nlmsg_seq;
2003 c.portid = nlh->nlmsg_pid;
2004 c.net = net;
2005 km_policy_notify(NULL, 0, &c);
2006 return 0;
2007 }
2008
2009 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2010 struct nlattr **attrs)
2011 {
2012 struct net *net = sock_net(skb->sk);
2013 struct xfrm_policy *xp;
2014 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2015 struct xfrm_userpolicy_info *p = &up->pol;
2016 u8 type = XFRM_POLICY_TYPE_MAIN;
2017 int err = -ENOENT;
2018 struct xfrm_mark m;
2019 u32 mark = xfrm_mark_get(attrs, &m);
2020
2021 err = copy_from_user_policy_type(&type, attrs);
2022 if (err)
2023 return err;
2024
2025 err = verify_policy_dir(p->dir);
2026 if (err)
2027 return err;
2028
2029 if (p->index)
2030 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2031 else {
2032 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2033 struct xfrm_sec_ctx *ctx;
2034
2035 err = verify_sec_ctx_len(attrs);
2036 if (err)
2037 return err;
2038
2039 ctx = NULL;
2040 if (rt) {
2041 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2042
2043 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2044 if (err)
2045 return err;
2046 }
2047 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2048 &p->sel, ctx, 0, &err);
2049 security_xfrm_policy_free(ctx);
2050 }
2051 if (xp == NULL)
2052 return -ENOENT;
2053
2054 if (unlikely(xp->walk.dead))
2055 goto out;
2056
2057 err = 0;
2058 if (up->hard) {
2059 xfrm_policy_delete(xp, p->dir);
2060 xfrm_audit_policy_delete(xp, 1, true);
2061 } else {
2062 // reset the timers here?
2063 WARN(1, "Don't know what to do with soft policy expire\n");
2064 }
2065 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2066
2067 out:
2068 xfrm_pol_put(xp);
2069 return err;
2070 }
2071
2072 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2073 struct nlattr **attrs)
2074 {
2075 struct net *net = sock_net(skb->sk);
2076 struct xfrm_state *x;
2077 int err;
2078 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2079 struct xfrm_usersa_info *p = &ue->state;
2080 struct xfrm_mark m;
2081 u32 mark = xfrm_mark_get(attrs, &m);
2082
2083 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2084
2085 err = -ENOENT;
2086 if (x == NULL)
2087 return err;
2088
2089 spin_lock_bh(&x->lock);
2090 err = -EINVAL;
2091 if (x->km.state != XFRM_STATE_VALID)
2092 goto out;
2093 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2094
2095 if (ue->hard) {
2096 __xfrm_state_delete(x);
2097 xfrm_audit_state_delete(x, 1, true);
2098 }
2099 err = 0;
2100 out:
2101 spin_unlock_bh(&x->lock);
2102 xfrm_state_put(x);
2103 return err;
2104 }
2105
2106 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2107 struct nlattr **attrs)
2108 {
2109 struct net *net = sock_net(skb->sk);
2110 struct xfrm_policy *xp;
2111 struct xfrm_user_tmpl *ut;
2112 int i;
2113 struct nlattr *rt = attrs[XFRMA_TMPL];
2114 struct xfrm_mark mark;
2115
2116 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2117 struct xfrm_state *x = xfrm_state_alloc(net);
2118 int err = -ENOMEM;
2119
2120 if (!x)
2121 goto nomem;
2122
2123 xfrm_mark_get(attrs, &mark);
2124
2125 err = verify_newpolicy_info(&ua->policy);
2126 if (err)
2127 goto bad_policy;
2128
2129 /* build an XP */
2130 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2131 if (!xp)
2132 goto free_state;
2133
2134 memcpy(&x->id, &ua->id, sizeof(ua->id));
2135 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2136 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2137 xp->mark.m = x->mark.m = mark.m;
2138 xp->mark.v = x->mark.v = mark.v;
2139 ut = nla_data(rt);
2140 /* extract the templates and for each call km_key */
2141 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2142 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2143 memcpy(&x->id, &t->id, sizeof(x->id));
2144 x->props.mode = t->mode;
2145 x->props.reqid = t->reqid;
2146 x->props.family = ut->family;
2147 t->aalgos = ua->aalgos;
2148 t->ealgos = ua->ealgos;
2149 t->calgos = ua->calgos;
2150 err = km_query(x, t, xp);
2151
2152 }
2153
2154 kfree(x);
2155 kfree(xp);
2156
2157 return 0;
2158
2159 bad_policy:
2160 WARN(1, "BAD policy passed\n");
2161 free_state:
2162 kfree(x);
2163 nomem:
2164 return err;
2165 }
2166
2167 #ifdef CONFIG_XFRM_MIGRATE
2168 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2169 struct xfrm_kmaddress *k,
2170 struct nlattr **attrs, int *num)
2171 {
2172 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2173 struct xfrm_user_migrate *um;
2174 int i, num_migrate;
2175
2176 if (k != NULL) {
2177 struct xfrm_user_kmaddress *uk;
2178
2179 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2180 memcpy(&k->local, &uk->local, sizeof(k->local));
2181 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2182 k->family = uk->family;
2183 k->reserved = uk->reserved;
2184 }
2185
2186 um = nla_data(rt);
2187 num_migrate = nla_len(rt) / sizeof(*um);
2188
2189 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2190 return -EINVAL;
2191
2192 for (i = 0; i < num_migrate; i++, um++, ma++) {
2193 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2194 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2195 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2196 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2197
2198 ma->proto = um->proto;
2199 ma->mode = um->mode;
2200 ma->reqid = um->reqid;
2201
2202 ma->old_family = um->old_family;
2203 ma->new_family = um->new_family;
2204 }
2205
2206 *num = i;
2207 return 0;
2208 }
2209
2210 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2211 struct nlattr **attrs)
2212 {
2213 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2214 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2215 struct xfrm_kmaddress km, *kmp;
2216 u8 type;
2217 int err;
2218 int n = 0;
2219 struct net *net = sock_net(skb->sk);
2220
2221 if (attrs[XFRMA_MIGRATE] == NULL)
2222 return -EINVAL;
2223
2224 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2225
2226 err = copy_from_user_policy_type(&type, attrs);
2227 if (err)
2228 return err;
2229
2230 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2231 if (err)
2232 return err;
2233
2234 if (!n)
2235 return 0;
2236
2237 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2238
2239 return 0;
2240 }
2241 #else
2242 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2243 struct nlattr **attrs)
2244 {
2245 return -ENOPROTOOPT;
2246 }
2247 #endif
2248
2249 #ifdef CONFIG_XFRM_MIGRATE
2250 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2251 {
2252 struct xfrm_user_migrate um;
2253
2254 memset(&um, 0, sizeof(um));
2255 um.proto = m->proto;
2256 um.mode = m->mode;
2257 um.reqid = m->reqid;
2258 um.old_family = m->old_family;
2259 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2260 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2261 um.new_family = m->new_family;
2262 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2263 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2264
2265 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2266 }
2267
2268 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2269 {
2270 struct xfrm_user_kmaddress uk;
2271
2272 memset(&uk, 0, sizeof(uk));
2273 uk.family = k->family;
2274 uk.reserved = k->reserved;
2275 memcpy(&uk.local, &k->local, sizeof(uk.local));
2276 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2277
2278 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2279 }
2280
2281 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2282 {
2283 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2284 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2285 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2286 + userpolicy_type_attrsize();
2287 }
2288
2289 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2290 int num_migrate, const struct xfrm_kmaddress *k,
2291 const struct xfrm_selector *sel, u8 dir, u8 type)
2292 {
2293 const struct xfrm_migrate *mp;
2294 struct xfrm_userpolicy_id *pol_id;
2295 struct nlmsghdr *nlh;
2296 int i, err;
2297
2298 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2299 if (nlh == NULL)
2300 return -EMSGSIZE;
2301
2302 pol_id = nlmsg_data(nlh);
2303 /* copy data from selector, dir, and type to the pol_id */
2304 memset(pol_id, 0, sizeof(*pol_id));
2305 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2306 pol_id->dir = dir;
2307
2308 if (k != NULL) {
2309 err = copy_to_user_kmaddress(k, skb);
2310 if (err)
2311 goto out_cancel;
2312 }
2313 err = copy_to_user_policy_type(type, skb);
2314 if (err)
2315 goto out_cancel;
2316 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2317 err = copy_to_user_migrate(mp, skb);
2318 if (err)
2319 goto out_cancel;
2320 }
2321
2322 nlmsg_end(skb, nlh);
2323 return 0;
2324
2325 out_cancel:
2326 nlmsg_cancel(skb, nlh);
2327 return err;
2328 }
2329
2330 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2331 const struct xfrm_migrate *m, int num_migrate,
2332 const struct xfrm_kmaddress *k)
2333 {
2334 struct net *net = &init_net;
2335 struct sk_buff *skb;
2336
2337 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2338 if (skb == NULL)
2339 return -ENOMEM;
2340
2341 /* build migrate */
2342 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2343 BUG();
2344
2345 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2346 }
2347 #else
2348 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2349 const struct xfrm_migrate *m, int num_migrate,
2350 const struct xfrm_kmaddress *k)
2351 {
2352 return -ENOPROTOOPT;
2353 }
2354 #endif
2355
2356 #define XMSGSIZE(type) sizeof(struct type)
2357
2358 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2359 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2360 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2361 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2362 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2363 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2364 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2365 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2366 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2367 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2368 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2369 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2370 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2371 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2372 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2373 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2374 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2375 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2376 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2377 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2378 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2379 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2380 };
2381
2382 #undef XMSGSIZE
2383
2384 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2385 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2386 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2387 [XFRMA_LASTUSED] = { .type = NLA_U64},
2388 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2389 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2390 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2391 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2392 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2393 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2394 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2395 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2396 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2397 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2398 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2399 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2400 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2401 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2402 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2403 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2404 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2405 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2406 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2407 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2408 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2409 [XFRMA_PROTO] = { .type = NLA_U8 },
2410 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2411 };
2412
2413 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2414 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2415 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2416 };
2417
2418 static const struct xfrm_link {
2419 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2420 int (*start)(struct netlink_callback *);
2421 int (*dump)(struct sk_buff *, struct netlink_callback *);
2422 int (*done)(struct netlink_callback *);
2423 const struct nla_policy *nla_pol;
2424 int nla_max;
2425 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2426 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2427 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2428 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2429 .dump = xfrm_dump_sa,
2430 .done = xfrm_dump_sa_done },
2431 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2432 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2433 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2434 .start = xfrm_dump_policy_start,
2435 .dump = xfrm_dump_policy,
2436 .done = xfrm_dump_policy_done },
2437 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2438 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2439 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2440 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2441 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2442 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2443 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2444 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2445 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2446 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2447 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2448 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2449 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2450 .nla_pol = xfrma_spd_policy,
2451 .nla_max = XFRMA_SPD_MAX },
2452 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2453 };
2454
2455 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2456 {
2457 struct net *net = sock_net(skb->sk);
2458 struct nlattr *attrs[XFRMA_MAX+1];
2459 const struct xfrm_link *link;
2460 int type, err;
2461
2462 #ifdef CONFIG_COMPAT
2463 if (is_compat_task())
2464 return -ENOTSUPP;
2465 #endif
2466
2467 type = nlh->nlmsg_type;
2468 if (type > XFRM_MSG_MAX)
2469 return -EINVAL;
2470
2471 type -= XFRM_MSG_BASE;
2472 link = &xfrm_dispatch[type];
2473
2474 /* All operations require privileges, even GET */
2475 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2476 return -EPERM;
2477
2478 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2479 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2480 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2481 if (link->dump == NULL)
2482 return -EINVAL;
2483
2484 {
2485 struct netlink_dump_control c = {
2486 .start = link->start,
2487 .dump = link->dump,
2488 .done = link->done,
2489 };
2490 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2491 }
2492 }
2493
2494 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2495 link->nla_max ? : XFRMA_MAX,
2496 link->nla_pol ? : xfrma_policy);
2497 if (err < 0)
2498 return err;
2499
2500 if (link->doit == NULL)
2501 return -EINVAL;
2502
2503 return link->doit(skb, nlh, attrs);
2504 }
2505
2506 static void xfrm_netlink_rcv(struct sk_buff *skb)
2507 {
2508 struct net *net = sock_net(skb->sk);
2509
2510 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2511 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2512 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2513 }
2514
2515 static inline size_t xfrm_expire_msgsize(void)
2516 {
2517 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2518 + nla_total_size(sizeof(struct xfrm_mark));
2519 }
2520
2521 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2522 {
2523 struct xfrm_user_expire *ue;
2524 struct nlmsghdr *nlh;
2525 int err;
2526
2527 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2528 if (nlh == NULL)
2529 return -EMSGSIZE;
2530
2531 ue = nlmsg_data(nlh);
2532 copy_to_user_state(x, &ue->state);
2533 ue->hard = (c->data.hard != 0) ? 1 : 0;
2534
2535 err = xfrm_mark_put(skb, &x->mark);
2536 if (err)
2537 return err;
2538
2539 nlmsg_end(skb, nlh);
2540 return 0;
2541 }
2542
2543 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2544 {
2545 struct net *net = xs_net(x);
2546 struct sk_buff *skb;
2547
2548 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2549 if (skb == NULL)
2550 return -ENOMEM;
2551
2552 if (build_expire(skb, x, c) < 0) {
2553 kfree_skb(skb);
2554 return -EMSGSIZE;
2555 }
2556
2557 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2558 }
2559
2560 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2561 {
2562 struct net *net = xs_net(x);
2563 struct sk_buff *skb;
2564
2565 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2566 if (skb == NULL)
2567 return -ENOMEM;
2568
2569 if (build_aevent(skb, x, c) < 0)
2570 BUG();
2571
2572 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2573 }
2574
2575 static int xfrm_notify_sa_flush(const struct km_event *c)
2576 {
2577 struct net *net = c->net;
2578 struct xfrm_usersa_flush *p;
2579 struct nlmsghdr *nlh;
2580 struct sk_buff *skb;
2581 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2582
2583 skb = nlmsg_new(len, GFP_ATOMIC);
2584 if (skb == NULL)
2585 return -ENOMEM;
2586
2587 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2588 if (nlh == NULL) {
2589 kfree_skb(skb);
2590 return -EMSGSIZE;
2591 }
2592
2593 p = nlmsg_data(nlh);
2594 p->proto = c->data.proto;
2595
2596 nlmsg_end(skb, nlh);
2597
2598 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2599 }
2600
2601 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2602 {
2603 size_t l = 0;
2604 if (x->aead)
2605 l += nla_total_size(aead_len(x->aead));
2606 if (x->aalg) {
2607 l += nla_total_size(sizeof(struct xfrm_algo) +
2608 (x->aalg->alg_key_len + 7) / 8);
2609 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2610 }
2611 if (x->ealg)
2612 l += nla_total_size(xfrm_alg_len(x->ealg));
2613 if (x->calg)
2614 l += nla_total_size(sizeof(*x->calg));
2615 if (x->encap)
2616 l += nla_total_size(sizeof(*x->encap));
2617 if (x->tfcpad)
2618 l += nla_total_size(sizeof(x->tfcpad));
2619 if (x->replay_esn)
2620 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2621 else
2622 l += nla_total_size(sizeof(struct xfrm_replay_state));
2623 if (x->security)
2624 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2625 x->security->ctx_len);
2626 if (x->coaddr)
2627 l += nla_total_size(sizeof(*x->coaddr));
2628 if (x->props.extra_flags)
2629 l += nla_total_size(sizeof(x->props.extra_flags));
2630
2631 /* Must count x->lastused as it may become non-zero behind our back. */
2632 l += nla_total_size(sizeof(u64));
2633
2634 return l;
2635 }
2636
2637 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2638 {
2639 struct net *net = xs_net(x);
2640 struct xfrm_usersa_info *p;
2641 struct xfrm_usersa_id *id;
2642 struct nlmsghdr *nlh;
2643 struct sk_buff *skb;
2644 int len = xfrm_sa_len(x);
2645 int headlen, err;
2646
2647 headlen = sizeof(*p);
2648 if (c->event == XFRM_MSG_DELSA) {
2649 len += nla_total_size(headlen);
2650 headlen = sizeof(*id);
2651 len += nla_total_size(sizeof(struct xfrm_mark));
2652 }
2653 len += NLMSG_ALIGN(headlen);
2654
2655 skb = nlmsg_new(len, GFP_ATOMIC);
2656 if (skb == NULL)
2657 return -ENOMEM;
2658
2659 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2660 err = -EMSGSIZE;
2661 if (nlh == NULL)
2662 goto out_free_skb;
2663
2664 p = nlmsg_data(nlh);
2665 if (c->event == XFRM_MSG_DELSA) {
2666 struct nlattr *attr;
2667
2668 id = nlmsg_data(nlh);
2669 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2670 id->spi = x->id.spi;
2671 id->family = x->props.family;
2672 id->proto = x->id.proto;
2673
2674 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2675 err = -EMSGSIZE;
2676 if (attr == NULL)
2677 goto out_free_skb;
2678
2679 p = nla_data(attr);
2680 }
2681 err = copy_to_user_state_extra(x, p, skb);
2682 if (err)
2683 goto out_free_skb;
2684
2685 nlmsg_end(skb, nlh);
2686
2687 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2688
2689 out_free_skb:
2690 kfree_skb(skb);
2691 return err;
2692 }
2693
2694 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2695 {
2696
2697 switch (c->event) {
2698 case XFRM_MSG_EXPIRE:
2699 return xfrm_exp_state_notify(x, c);
2700 case XFRM_MSG_NEWAE:
2701 return xfrm_aevent_state_notify(x, c);
2702 case XFRM_MSG_DELSA:
2703 case XFRM_MSG_UPDSA:
2704 case XFRM_MSG_NEWSA:
2705 return xfrm_notify_sa(x, c);
2706 case XFRM_MSG_FLUSHSA:
2707 return xfrm_notify_sa_flush(c);
2708 default:
2709 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2710 c->event);
2711 break;
2712 }
2713
2714 return 0;
2715
2716 }
2717
2718 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2719 struct xfrm_policy *xp)
2720 {
2721 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2722 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2723 + nla_total_size(sizeof(struct xfrm_mark))
2724 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2725 + userpolicy_type_attrsize();
2726 }
2727
2728 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2729 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2730 {
2731 __u32 seq = xfrm_get_acqseq();
2732 struct xfrm_user_acquire *ua;
2733 struct nlmsghdr *nlh;
2734 int err;
2735
2736 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2737 if (nlh == NULL)
2738 return -EMSGSIZE;
2739
2740 ua = nlmsg_data(nlh);
2741 memcpy(&ua->id, &x->id, sizeof(ua->id));
2742 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2743 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2744 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2745 ua->aalgos = xt->aalgos;
2746 ua->ealgos = xt->ealgos;
2747 ua->calgos = xt->calgos;
2748 ua->seq = x->km.seq = seq;
2749
2750 err = copy_to_user_tmpl(xp, skb);
2751 if (!err)
2752 err = copy_to_user_state_sec_ctx(x, skb);
2753 if (!err)
2754 err = copy_to_user_policy_type(xp->type, skb);
2755 if (!err)
2756 err = xfrm_mark_put(skb, &xp->mark);
2757 if (err) {
2758 nlmsg_cancel(skb, nlh);
2759 return err;
2760 }
2761
2762 nlmsg_end(skb, nlh);
2763 return 0;
2764 }
2765
2766 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2767 struct xfrm_policy *xp)
2768 {
2769 struct net *net = xs_net(x);
2770 struct sk_buff *skb;
2771
2772 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2773 if (skb == NULL)
2774 return -ENOMEM;
2775
2776 if (build_acquire(skb, x, xt, xp) < 0)
2777 BUG();
2778
2779 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2780 }
2781
2782 /* User gives us xfrm_user_policy_info followed by an array of 0
2783 * or more templates.
2784 */
2785 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2786 u8 *data, int len, int *dir)
2787 {
2788 struct net *net = sock_net(sk);
2789 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2790 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2791 struct xfrm_policy *xp;
2792 int nr;
2793
2794 switch (sk->sk_family) {
2795 case AF_INET:
2796 if (opt != IP_XFRM_POLICY) {
2797 *dir = -EOPNOTSUPP;
2798 return NULL;
2799 }
2800 break;
2801 #if IS_ENABLED(CONFIG_IPV6)
2802 case AF_INET6:
2803 if (opt != IPV6_XFRM_POLICY) {
2804 *dir = -EOPNOTSUPP;
2805 return NULL;
2806 }
2807 break;
2808 #endif
2809 default:
2810 *dir = -EINVAL;
2811 return NULL;
2812 }
2813
2814 *dir = -EINVAL;
2815
2816 if (len < sizeof(*p) ||
2817 verify_newpolicy_info(p))
2818 return NULL;
2819
2820 nr = ((len - sizeof(*p)) / sizeof(*ut));
2821 if (validate_tmpl(nr, ut, p->sel.family))
2822 return NULL;
2823
2824 if (p->dir > XFRM_POLICY_OUT)
2825 return NULL;
2826
2827 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2828 if (xp == NULL) {
2829 *dir = -ENOBUFS;
2830 return NULL;
2831 }
2832
2833 copy_from_user_policy(xp, p);
2834 xp->type = XFRM_POLICY_TYPE_MAIN;
2835 copy_templates(xp, ut, nr);
2836
2837 *dir = p->dir;
2838
2839 return xp;
2840 }
2841
2842 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2843 {
2844 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2845 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2846 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2847 + nla_total_size(sizeof(struct xfrm_mark))
2848 + userpolicy_type_attrsize();
2849 }
2850
2851 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2852 int dir, const struct km_event *c)
2853 {
2854 struct xfrm_user_polexpire *upe;
2855 int hard = c->data.hard;
2856 struct nlmsghdr *nlh;
2857 int err;
2858
2859 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2860 if (nlh == NULL)
2861 return -EMSGSIZE;
2862
2863 upe = nlmsg_data(nlh);
2864 copy_to_user_policy(xp, &upe->pol, dir);
2865 err = copy_to_user_tmpl(xp, skb);
2866 if (!err)
2867 err = copy_to_user_sec_ctx(xp, skb);
2868 if (!err)
2869 err = copy_to_user_policy_type(xp->type, skb);
2870 if (!err)
2871 err = xfrm_mark_put(skb, &xp->mark);
2872 if (err) {
2873 nlmsg_cancel(skb, nlh);
2874 return err;
2875 }
2876 upe->hard = !!hard;
2877
2878 nlmsg_end(skb, nlh);
2879 return 0;
2880 }
2881
2882 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2883 {
2884 struct net *net = xp_net(xp);
2885 struct sk_buff *skb;
2886
2887 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2888 if (skb == NULL)
2889 return -ENOMEM;
2890
2891 if (build_polexpire(skb, xp, dir, c) < 0)
2892 BUG();
2893
2894 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2895 }
2896
2897 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2898 {
2899 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2900 struct net *net = xp_net(xp);
2901 struct xfrm_userpolicy_info *p;
2902 struct xfrm_userpolicy_id *id;
2903 struct nlmsghdr *nlh;
2904 struct sk_buff *skb;
2905 int headlen, err;
2906
2907 headlen = sizeof(*p);
2908 if (c->event == XFRM_MSG_DELPOLICY) {
2909 len += nla_total_size(headlen);
2910 headlen = sizeof(*id);
2911 }
2912 len += userpolicy_type_attrsize();
2913 len += nla_total_size(sizeof(struct xfrm_mark));
2914 len += NLMSG_ALIGN(headlen);
2915
2916 skb = nlmsg_new(len, GFP_ATOMIC);
2917 if (skb == NULL)
2918 return -ENOMEM;
2919
2920 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2921 err = -EMSGSIZE;
2922 if (nlh == NULL)
2923 goto out_free_skb;
2924
2925 p = nlmsg_data(nlh);
2926 if (c->event == XFRM_MSG_DELPOLICY) {
2927 struct nlattr *attr;
2928
2929 id = nlmsg_data(nlh);
2930 memset(id, 0, sizeof(*id));
2931 id->dir = dir;
2932 if (c->data.byid)
2933 id->index = xp->index;
2934 else
2935 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2936
2937 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2938 err = -EMSGSIZE;
2939 if (attr == NULL)
2940 goto out_free_skb;
2941
2942 p = nla_data(attr);
2943 }
2944
2945 copy_to_user_policy(xp, p, dir);
2946 err = copy_to_user_tmpl(xp, 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 goto out_free_skb;
2953
2954 nlmsg_end(skb, nlh);
2955
2956 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2957
2958 out_free_skb:
2959 kfree_skb(skb);
2960 return err;
2961 }
2962
2963 static int xfrm_notify_policy_flush(const struct km_event *c)
2964 {
2965 struct net *net = c->net;
2966 struct nlmsghdr *nlh;
2967 struct sk_buff *skb;
2968 int err;
2969
2970 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2971 if (skb == NULL)
2972 return -ENOMEM;
2973
2974 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2975 err = -EMSGSIZE;
2976 if (nlh == NULL)
2977 goto out_free_skb;
2978 err = copy_to_user_policy_type(c->data.type, skb);
2979 if (err)
2980 goto out_free_skb;
2981
2982 nlmsg_end(skb, nlh);
2983
2984 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2985
2986 out_free_skb:
2987 kfree_skb(skb);
2988 return err;
2989 }
2990
2991 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2992 {
2993
2994 switch (c->event) {
2995 case XFRM_MSG_NEWPOLICY:
2996 case XFRM_MSG_UPDPOLICY:
2997 case XFRM_MSG_DELPOLICY:
2998 return xfrm_notify_policy(xp, dir, c);
2999 case XFRM_MSG_FLUSHPOLICY:
3000 return xfrm_notify_policy_flush(c);
3001 case XFRM_MSG_POLEXPIRE:
3002 return xfrm_exp_policy_notify(xp, dir, c);
3003 default:
3004 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3005 c->event);
3006 }
3007
3008 return 0;
3009
3010 }
3011
3012 static inline size_t xfrm_report_msgsize(void)
3013 {
3014 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3015 }
3016
3017 static int build_report(struct sk_buff *skb, u8 proto,
3018 struct xfrm_selector *sel, xfrm_address_t *addr)
3019 {
3020 struct xfrm_user_report *ur;
3021 struct nlmsghdr *nlh;
3022
3023 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3024 if (nlh == NULL)
3025 return -EMSGSIZE;
3026
3027 ur = nlmsg_data(nlh);
3028 ur->proto = proto;
3029 memcpy(&ur->sel, sel, sizeof(ur->sel));
3030
3031 if (addr) {
3032 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3033 if (err) {
3034 nlmsg_cancel(skb, nlh);
3035 return err;
3036 }
3037 }
3038 nlmsg_end(skb, nlh);
3039 return 0;
3040 }
3041
3042 static int xfrm_send_report(struct net *net, u8 proto,
3043 struct xfrm_selector *sel, xfrm_address_t *addr)
3044 {
3045 struct sk_buff *skb;
3046
3047 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3048 if (skb == NULL)
3049 return -ENOMEM;
3050
3051 if (build_report(skb, proto, sel, addr) < 0)
3052 BUG();
3053
3054 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3055 }
3056
3057 static inline size_t xfrm_mapping_msgsize(void)
3058 {
3059 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3060 }
3061
3062 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3063 xfrm_address_t *new_saddr, __be16 new_sport)
3064 {
3065 struct xfrm_user_mapping *um;
3066 struct nlmsghdr *nlh;
3067
3068 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3069 if (nlh == NULL)
3070 return -EMSGSIZE;
3071
3072 um = nlmsg_data(nlh);
3073
3074 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3075 um->id.spi = x->id.spi;
3076 um->id.family = x->props.family;
3077 um->id.proto = x->id.proto;
3078 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3079 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3080 um->new_sport = new_sport;
3081 um->old_sport = x->encap->encap_sport;
3082 um->reqid = x->props.reqid;
3083
3084 nlmsg_end(skb, nlh);
3085 return 0;
3086 }
3087
3088 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3089 __be16 sport)
3090 {
3091 struct net *net = xs_net(x);
3092 struct sk_buff *skb;
3093
3094 if (x->id.proto != IPPROTO_ESP)
3095 return -EINVAL;
3096
3097 if (!x->encap)
3098 return -EINVAL;
3099
3100 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3101 if (skb == NULL)
3102 return -ENOMEM;
3103
3104 if (build_mapping(skb, x, ipaddr, sport) < 0)
3105 BUG();
3106
3107 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3108 }
3109
3110 static bool xfrm_is_alive(const struct km_event *c)
3111 {
3112 return (bool)xfrm_acquire_is_on(c->net);
3113 }
3114
3115 static struct xfrm_mgr netlink_mgr = {
3116 .id = "netlink",
3117 .notify = xfrm_send_state_notify,
3118 .acquire = xfrm_send_acquire,
3119 .compile_policy = xfrm_compile_policy,
3120 .notify_policy = xfrm_send_policy_notify,
3121 .report = xfrm_send_report,
3122 .migrate = xfrm_send_migrate,
3123 .new_mapping = xfrm_send_mapping,
3124 .is_alive = xfrm_is_alive,
3125 };
3126
3127 static int __net_init xfrm_user_net_init(struct net *net)
3128 {
3129 struct sock *nlsk;
3130 struct netlink_kernel_cfg cfg = {
3131 .groups = XFRMNLGRP_MAX,
3132 .input = xfrm_netlink_rcv,
3133 };
3134
3135 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3136 if (nlsk == NULL)
3137 return -ENOMEM;
3138 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3139 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3140 return 0;
3141 }
3142
3143 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3144 {
3145 struct net *net;
3146 list_for_each_entry(net, net_exit_list, exit_list)
3147 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3148 synchronize_net();
3149 list_for_each_entry(net, net_exit_list, exit_list)
3150 netlink_kernel_release(net->xfrm.nlsk_stash);
3151 }
3152
3153 static struct pernet_operations xfrm_user_net_ops = {
3154 .init = xfrm_user_net_init,
3155 .exit_batch = xfrm_user_net_exit,
3156 };
3157
3158 static int __init xfrm_user_init(void)
3159 {
3160 int rv;
3161
3162 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3163
3164 rv = register_pernet_subsys(&xfrm_user_net_ops);
3165 if (rv < 0)
3166 return rv;
3167 rv = xfrm_register_km(&netlink_mgr);
3168 if (rv < 0)
3169 unregister_pernet_subsys(&xfrm_user_net_ops);
3170 return rv;
3171 }
3172
3173 static void __exit xfrm_user_exit(void)
3174 {
3175 xfrm_unregister_km(&netlink_mgr);
3176 unregister_pernet_subsys(&xfrm_user_net_ops);
3177 }
3178
3179 module_init(xfrm_user_init);
3180 module_exit(xfrm_user_exit);
3181 MODULE_LICENSE("GPL");
3182 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3183
Linux with added FPC-III support