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i2c: designware-master: use core to detect 'no zero length' quirk
[linux/fpc-iii.git] / net / xfrm / xfrm_user.c
blob080035f056d992c49f8cbcc776d579c9769c67eb
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <linux/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 #include <asm/unaligned.h>
35
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) < (int)xfrm_alg_len(algp))
46 return -EINVAL;
47
48 switch (type) {
49 case XFRMA_ALG_AUTH:
50 case XFRMA_ALG_CRYPT:
51 case XFRMA_ALG_COMP:
52 break;
53
54 default:
55 return -EINVAL;
56 }
57
58 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
59 return 0;
60 }
61
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) < (int)xfrm_alg_auth_len(algp))
72 return -EINVAL;
73
74 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
75 return 0;
76 }
77
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) < (int)aead_len(algp))
88 return -EINVAL;
89
90 algp->alg_name[sizeof(algp->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 (!rt)
125 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
126
127 rs = nla_data(rt);
128
129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 return -EINVAL;
131
132 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
133 nla_len(rt) != sizeof(*rs))
134 return -EINVAL;
135
136 /* As only ESP and AH support ESN feature. */
137 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
138 return -EINVAL;
139
140 if (p->replay_window != 0)
141 return -EINVAL;
142
143 return 0;
144 }
145
146 static int verify_newsa_info(struct xfrm_usersa_info *p,
147 struct nlattr **attrs)
148 {
149 int err;
150
151 err = -EINVAL;
152 switch (p->family) {
153 case AF_INET:
154 break;
155
156 case AF_INET6:
157 #if IS_ENABLED(CONFIG_IPV6)
158 break;
159 #else
160 err = -EAFNOSUPPORT;
161 goto out;
162 #endif
163
164 default:
165 goto out;
166 }
167
168 err = -EINVAL;
169 switch (p->id.proto) {
170 case IPPROTO_AH:
171 if ((!attrs[XFRMA_ALG_AUTH] &&
172 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
173 attrs[XFRMA_ALG_AEAD] ||
174 attrs[XFRMA_ALG_CRYPT] ||
175 attrs[XFRMA_ALG_COMP] ||
176 attrs[XFRMA_TFCPAD])
177 goto out;
178 break;
179
180 case IPPROTO_ESP:
181 if (attrs[XFRMA_ALG_COMP])
182 goto out;
183 if (!attrs[XFRMA_ALG_AUTH] &&
184 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
185 !attrs[XFRMA_ALG_CRYPT] &&
186 !attrs[XFRMA_ALG_AEAD])
187 goto out;
188 if ((attrs[XFRMA_ALG_AUTH] ||
189 attrs[XFRMA_ALG_AUTH_TRUNC] ||
190 attrs[XFRMA_ALG_CRYPT]) &&
191 attrs[XFRMA_ALG_AEAD])
192 goto out;
193 if (attrs[XFRMA_TFCPAD] &&
194 p->mode != XFRM_MODE_TUNNEL)
195 goto out;
196 break;
197
198 case IPPROTO_COMP:
199 if (!attrs[XFRMA_ALG_COMP] ||
200 attrs[XFRMA_ALG_AEAD] ||
201 attrs[XFRMA_ALG_AUTH] ||
202 attrs[XFRMA_ALG_AUTH_TRUNC] ||
203 attrs[XFRMA_ALG_CRYPT] ||
204 attrs[XFRMA_TFCPAD] ||
205 (ntohl(p->id.spi) >= 0x10000))
206 goto out;
207 break;
208
209 #if IS_ENABLED(CONFIG_IPV6)
210 case IPPROTO_DSTOPTS:
211 case IPPROTO_ROUTING:
212 if (attrs[XFRMA_ALG_COMP] ||
213 attrs[XFRMA_ALG_AUTH] ||
214 attrs[XFRMA_ALG_AUTH_TRUNC] ||
215 attrs[XFRMA_ALG_AEAD] ||
216 attrs[XFRMA_ALG_CRYPT] ||
217 attrs[XFRMA_ENCAP] ||
218 attrs[XFRMA_SEC_CTX] ||
219 attrs[XFRMA_TFCPAD] ||
220 !attrs[XFRMA_COADDR])
221 goto out;
222 break;
223 #endif
224
225 default:
226 goto out;
227 }
228
229 if ((err = verify_aead(attrs)))
230 goto out;
231 if ((err = verify_auth_trunc(attrs)))
232 goto out;
233 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
234 goto out;
235 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
236 goto out;
237 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
238 goto out;
239 if ((err = verify_sec_ctx_len(attrs)))
240 goto out;
241 if ((err = verify_replay(p, attrs)))
242 goto out;
243
244 err = -EINVAL;
245 switch (p->mode) {
246 case XFRM_MODE_TRANSPORT:
247 case XFRM_MODE_TUNNEL:
248 case XFRM_MODE_ROUTEOPTIMIZATION:
249 case XFRM_MODE_BEET:
250 break;
251
252 default:
253 goto out;
254 }
255
256 err = 0;
257
258 out:
259 return err;
260 }
261
262 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
263 struct xfrm_algo_desc *(*get_byname)(const char *, int),
264 struct nlattr *rta)
265 {
266 struct xfrm_algo *p, *ualg;
267 struct xfrm_algo_desc *algo;
268
269 if (!rta)
270 return 0;
271
272 ualg = nla_data(rta);
273
274 algo = get_byname(ualg->alg_name, 1);
275 if (!algo)
276 return -ENOSYS;
277 *props = algo->desc.sadb_alg_id;
278
279 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
280 if (!p)
281 return -ENOMEM;
282
283 strcpy(p->alg_name, algo->name);
284 *algpp = p;
285 return 0;
286 }
287
288 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
289 {
290 struct xfrm_algo *p, *ualg;
291 struct xfrm_algo_desc *algo;
292
293 if (!rta)
294 return 0;
295
296 ualg = nla_data(rta);
297
298 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
299 if (!algo)
300 return -ENOSYS;
301 x->props.ealgo = algo->desc.sadb_alg_id;
302
303 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
304 if (!p)
305 return -ENOMEM;
306
307 strcpy(p->alg_name, algo->name);
308 x->ealg = p;
309 x->geniv = algo->uinfo.encr.geniv;
310 return 0;
311 }
312
313 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315 {
316 struct xfrm_algo *ualg;
317 struct xfrm_algo_auth *p;
318 struct xfrm_algo_desc *algo;
319
320 if (!rta)
321 return 0;
322
323 ualg = nla_data(rta);
324
325 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
326 if (!algo)
327 return -ENOSYS;
328 *props = algo->desc.sadb_alg_id;
329
330 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
331 if (!p)
332 return -ENOMEM;
333
334 strcpy(p->alg_name, algo->name);
335 p->alg_key_len = ualg->alg_key_len;
336 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
337 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
338
339 *algpp = p;
340 return 0;
341 }
342
343 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
344 struct nlattr *rta)
345 {
346 struct xfrm_algo_auth *p, *ualg;
347 struct xfrm_algo_desc *algo;
348
349 if (!rta)
350 return 0;
351
352 ualg = nla_data(rta);
353
354 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
355 if (!algo)
356 return -ENOSYS;
357 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
358 return -EINVAL;
359 *props = algo->desc.sadb_alg_id;
360
361 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
362 if (!p)
363 return -ENOMEM;
364
365 strcpy(p->alg_name, algo->name);
366 if (!p->alg_trunc_len)
367 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
368
369 *algpp = p;
370 return 0;
371 }
372
373 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
374 {
375 struct xfrm_algo_aead *p, *ualg;
376 struct xfrm_algo_desc *algo;
377
378 if (!rta)
379 return 0;
380
381 ualg = nla_data(rta);
382
383 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
384 if (!algo)
385 return -ENOSYS;
386 x->props.ealgo = algo->desc.sadb_alg_id;
387
388 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
389 if (!p)
390 return -ENOMEM;
391
392 strcpy(p->alg_name, algo->name);
393 x->aead = p;
394 x->geniv = algo->uinfo.aead.geniv;
395 return 0;
396 }
397
398 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
399 struct nlattr *rp)
400 {
401 struct xfrm_replay_state_esn *up;
402 unsigned int ulen;
403
404 if (!replay_esn || !rp)
405 return 0;
406
407 up = nla_data(rp);
408 ulen = xfrm_replay_state_esn_len(up);
409
410 /* Check the overall length and the internal bitmap length to avoid
411 * potential overflow. */
412 if (nla_len(rp) < (int)ulen ||
413 xfrm_replay_state_esn_len(replay_esn) != ulen ||
414 replay_esn->bmp_len != up->bmp_len)
415 return -EINVAL;
416
417 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
418 return -EINVAL;
419
420 return 0;
421 }
422
423 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
424 struct xfrm_replay_state_esn **preplay_esn,
425 struct nlattr *rta)
426 {
427 struct xfrm_replay_state_esn *p, *pp, *up;
428 unsigned int klen, ulen;
429
430 if (!rta)
431 return 0;
432
433 up = nla_data(rta);
434 klen = xfrm_replay_state_esn_len(up);
435 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
436
437 p = kzalloc(klen, GFP_KERNEL);
438 if (!p)
439 return -ENOMEM;
440
441 pp = kzalloc(klen, GFP_KERNEL);
442 if (!pp) {
443 kfree(p);
444 return -ENOMEM;
445 }
446
447 memcpy(p, up, ulen);
448 memcpy(pp, up, ulen);
449
450 *replay_esn = p;
451 *preplay_esn = pp;
452
453 return 0;
454 }
455
456 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
457 {
458 unsigned int len = 0;
459
460 if (xfrm_ctx) {
461 len += sizeof(struct xfrm_user_sec_ctx);
462 len += xfrm_ctx->ctx_len;
463 }
464 return len;
465 }
466
467 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
468 {
469 memcpy(&x->id, &p->id, sizeof(x->id));
470 memcpy(&x->sel, &p->sel, sizeof(x->sel));
471 memcpy(&x->lft, &p->lft, sizeof(x->lft));
472 x->props.mode = p->mode;
473 x->props.replay_window = min_t(unsigned int, p->replay_window,
474 sizeof(x->replay.bitmap) * 8);
475 x->props.reqid = p->reqid;
476 x->props.family = p->family;
477 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
478 x->props.flags = p->flags;
479
480 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
481 x->sel.family = p->family;
482 }
483
484 /*
485 * someday when pfkey also has support, we could have the code
486 * somehow made shareable and move it to xfrm_state.c - JHS
487 *
488 */
489 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
490 int update_esn)
491 {
492 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
493 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
494 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
495 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
496 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
497
498 if (re) {
499 struct xfrm_replay_state_esn *replay_esn;
500 replay_esn = nla_data(re);
501 memcpy(x->replay_esn, replay_esn,
502 xfrm_replay_state_esn_len(replay_esn));
503 memcpy(x->preplay_esn, replay_esn,
504 xfrm_replay_state_esn_len(replay_esn));
505 }
506
507 if (rp) {
508 struct xfrm_replay_state *replay;
509 replay = nla_data(rp);
510 memcpy(&x->replay, replay, sizeof(*replay));
511 memcpy(&x->preplay, replay, sizeof(*replay));
512 }
513
514 if (lt) {
515 struct xfrm_lifetime_cur *ltime;
516 ltime = nla_data(lt);
517 x->curlft.bytes = ltime->bytes;
518 x->curlft.packets = ltime->packets;
519 x->curlft.add_time = ltime->add_time;
520 x->curlft.use_time = ltime->use_time;
521 }
522
523 if (et)
524 x->replay_maxage = nla_get_u32(et);
525
526 if (rt)
527 x->replay_maxdiff = nla_get_u32(rt);
528 }
529
530 static struct xfrm_state *xfrm_state_construct(struct net *net,
531 struct xfrm_usersa_info *p,
532 struct nlattr **attrs,
533 int *errp)
534 {
535 struct xfrm_state *x = xfrm_state_alloc(net);
536 int err = -ENOMEM;
537
538 if (!x)
539 goto error_no_put;
540
541 copy_from_user_state(x, p);
542
543 if (attrs[XFRMA_SA_EXTRA_FLAGS])
544 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
545
546 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
547 goto error;
548 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
549 attrs[XFRMA_ALG_AUTH_TRUNC])))
550 goto error;
551 if (!x->props.aalgo) {
552 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
553 attrs[XFRMA_ALG_AUTH])))
554 goto error;
555 }
556 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
557 goto error;
558 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
559 xfrm_calg_get_byname,
560 attrs[XFRMA_ALG_COMP])))
561 goto error;
562
563 if (attrs[XFRMA_ENCAP]) {
564 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
565 sizeof(*x->encap), GFP_KERNEL);
566 if (x->encap == NULL)
567 goto error;
568 }
569
570 if (attrs[XFRMA_TFCPAD])
571 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
572
573 if (attrs[XFRMA_COADDR]) {
574 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
575 sizeof(*x->coaddr), GFP_KERNEL);
576 if (x->coaddr == NULL)
577 goto error;
578 }
579
580 xfrm_mark_get(attrs, &x->mark);
581
582 if (attrs[XFRMA_OUTPUT_MARK])
583 x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]);
584
585 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
586 if (err)
587 goto error;
588
589 if (attrs[XFRMA_SEC_CTX]) {
590 err = security_xfrm_state_alloc(x,
591 nla_data(attrs[XFRMA_SEC_CTX]));
592 if (err)
593 goto error;
594 }
595
596 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
597 attrs[XFRMA_REPLAY_ESN_VAL])))
598 goto error;
599
600 x->km.seq = p->seq;
601 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
602 /* sysctl_xfrm_aevent_etime is in 100ms units */
603 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
604
605 if ((err = xfrm_init_replay(x)))
606 goto error;
607
608 /* override default values from above */
609 xfrm_update_ae_params(x, attrs, 0);
610
611 /* configure the hardware if offload is requested */
612 if (attrs[XFRMA_OFFLOAD_DEV]) {
613 err = xfrm_dev_state_add(net, x,
614 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
615 if (err)
616 goto error;
617 }
618
619 return x;
620
621 error:
622 x->km.state = XFRM_STATE_DEAD;
623 xfrm_state_put(x);
624 error_no_put:
625 *errp = err;
626 return NULL;
627 }
628
629 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
630 struct nlattr **attrs)
631 {
632 struct net *net = sock_net(skb->sk);
633 struct xfrm_usersa_info *p = nlmsg_data(nlh);
634 struct xfrm_state *x;
635 int err;
636 struct km_event c;
637
638 err = verify_newsa_info(p, attrs);
639 if (err)
640 return err;
641
642 x = xfrm_state_construct(net, p, attrs, &err);
643 if (!x)
644 return err;
645
646 xfrm_state_hold(x);
647 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
648 err = xfrm_state_add(x);
649 else
650 err = xfrm_state_update(x);
651
652 xfrm_audit_state_add(x, err ? 0 : 1, true);
653
654 if (err < 0) {
655 x->km.state = XFRM_STATE_DEAD;
656 xfrm_dev_state_delete(x);
657 __xfrm_state_put(x);
658 goto out;
659 }
660
661 if (x->km.state == XFRM_STATE_VOID)
662 x->km.state = XFRM_STATE_VALID;
663
664 c.seq = nlh->nlmsg_seq;
665 c.portid = nlh->nlmsg_pid;
666 c.event = nlh->nlmsg_type;
667
668 km_state_notify(x, &c);
669 out:
670 xfrm_state_put(x);
671 return err;
672 }
673
674 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
675 struct xfrm_usersa_id *p,
676 struct nlattr **attrs,
677 int *errp)
678 {
679 struct xfrm_state *x = NULL;
680 struct xfrm_mark m;
681 int err;
682 u32 mark = xfrm_mark_get(attrs, &m);
683
684 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
685 err = -ESRCH;
686 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
687 } else {
688 xfrm_address_t *saddr = NULL;
689
690 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
691 if (!saddr) {
692 err = -EINVAL;
693 goto out;
694 }
695
696 err = -ESRCH;
697 x = xfrm_state_lookup_byaddr(net, mark,
698 &p->daddr, saddr,
699 p->proto, p->family);
700 }
701
702 out:
703 if (!x && errp)
704 *errp = err;
705 return x;
706 }
707
708 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
709 struct nlattr **attrs)
710 {
711 struct net *net = sock_net(skb->sk);
712 struct xfrm_state *x;
713 int err = -ESRCH;
714 struct km_event c;
715 struct xfrm_usersa_id *p = nlmsg_data(nlh);
716
717 x = xfrm_user_state_lookup(net, p, attrs, &err);
718 if (x == NULL)
719 return err;
720
721 if ((err = security_xfrm_state_delete(x)) != 0)
722 goto out;
723
724 if (xfrm_state_kern(x)) {
725 err = -EPERM;
726 goto out;
727 }
728
729 err = xfrm_state_delete(x);
730
731 if (err < 0)
732 goto out;
733
734 c.seq = nlh->nlmsg_seq;
735 c.portid = nlh->nlmsg_pid;
736 c.event = nlh->nlmsg_type;
737 km_state_notify(x, &c);
738
739 out:
740 xfrm_audit_state_delete(x, err ? 0 : 1, true);
741 xfrm_state_put(x);
742 return err;
743 }
744
745 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
746 {
747 memset(p, 0, sizeof(*p));
748 memcpy(&p->id, &x->id, sizeof(p->id));
749 memcpy(&p->sel, &x->sel, sizeof(p->sel));
750 memcpy(&p->lft, &x->lft, sizeof(p->lft));
751 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
752 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
753 put_unaligned(x->stats.replay, &p->stats.replay);
754 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
755 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
756 p->mode = x->props.mode;
757 p->replay_window = x->props.replay_window;
758 p->reqid = x->props.reqid;
759 p->family = x->props.family;
760 p->flags = x->props.flags;
761 p->seq = x->km.seq;
762 }
763
764 struct xfrm_dump_info {
765 struct sk_buff *in_skb;
766 struct sk_buff *out_skb;
767 u32 nlmsg_seq;
768 u16 nlmsg_flags;
769 };
770
771 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
772 {
773 struct xfrm_user_sec_ctx *uctx;
774 struct nlattr *attr;
775 int ctx_size = sizeof(*uctx) + s->ctx_len;
776
777 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
778 if (attr == NULL)
779 return -EMSGSIZE;
780
781 uctx = nla_data(attr);
782 uctx->exttype = XFRMA_SEC_CTX;
783 uctx->len = ctx_size;
784 uctx->ctx_doi = s->ctx_doi;
785 uctx->ctx_alg = s->ctx_alg;
786 uctx->ctx_len = s->ctx_len;
787 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
788
789 return 0;
790 }
791
792 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
793 {
794 struct xfrm_user_offload *xuo;
795 struct nlattr *attr;
796
797 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
798 if (attr == NULL)
799 return -EMSGSIZE;
800
801 xuo = nla_data(attr);
802 memset(xuo, 0, sizeof(*xuo));
803 xuo->ifindex = xso->dev->ifindex;
804 xuo->flags = xso->flags;
805
806 return 0;
807 }
808
809 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
810 {
811 struct xfrm_algo *algo;
812 struct nlattr *nla;
813
814 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
815 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
816 if (!nla)
817 return -EMSGSIZE;
818
819 algo = nla_data(nla);
820 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
821 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
822 algo->alg_key_len = auth->alg_key_len;
823
824 return 0;
825 }
826
827 /* Don't change this without updating xfrm_sa_len! */
828 static int copy_to_user_state_extra(struct xfrm_state *x,
829 struct xfrm_usersa_info *p,
830 struct sk_buff *skb)
831 {
832 int ret = 0;
833
834 copy_to_user_state(x, p);
835
836 if (x->props.extra_flags) {
837 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
838 x->props.extra_flags);
839 if (ret)
840 goto out;
841 }
842
843 if (x->coaddr) {
844 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
845 if (ret)
846 goto out;
847 }
848 if (x->lastused) {
849 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
850 XFRMA_PAD);
851 if (ret)
852 goto out;
853 }
854 if (x->aead) {
855 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
856 if (ret)
857 goto out;
858 }
859 if (x->aalg) {
860 ret = copy_to_user_auth(x->aalg, skb);
861 if (!ret)
862 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
863 xfrm_alg_auth_len(x->aalg), x->aalg);
864 if (ret)
865 goto out;
866 }
867 if (x->ealg) {
868 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
869 if (ret)
870 goto out;
871 }
872 if (x->calg) {
873 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
874 if (ret)
875 goto out;
876 }
877 if (x->encap) {
878 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
879 if (ret)
880 goto out;
881 }
882 if (x->tfcpad) {
883 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
884 if (ret)
885 goto out;
886 }
887 ret = xfrm_mark_put(skb, &x->mark);
888 if (ret)
889 goto out;
890 if (x->replay_esn)
891 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
892 xfrm_replay_state_esn_len(x->replay_esn),
893 x->replay_esn);
894 else
895 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
896 &x->replay);
897 if (ret)
898 goto out;
899 if(x->xso.dev)
900 ret = copy_user_offload(&x->xso, skb);
901 if (ret)
902 goto out;
903 if (x->props.output_mark) {
904 ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
905 if (ret)
906 goto out;
907 }
908 if (x->security)
909 ret = copy_sec_ctx(x->security, skb);
910 out:
911 return ret;
912 }
913
914 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
915 {
916 struct xfrm_dump_info *sp = ptr;
917 struct sk_buff *in_skb = sp->in_skb;
918 struct sk_buff *skb = sp->out_skb;
919 struct xfrm_usersa_info *p;
920 struct nlmsghdr *nlh;
921 int err;
922
923 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
924 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
925 if (nlh == NULL)
926 return -EMSGSIZE;
927
928 p = nlmsg_data(nlh);
929
930 err = copy_to_user_state_extra(x, p, skb);
931 if (err) {
932 nlmsg_cancel(skb, nlh);
933 return err;
934 }
935 nlmsg_end(skb, nlh);
936 return 0;
937 }
938
939 static int xfrm_dump_sa_done(struct netlink_callback *cb)
940 {
941 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
942 struct sock *sk = cb->skb->sk;
943 struct net *net = sock_net(sk);
944
945 if (cb->args[0])
946 xfrm_state_walk_done(walk, net);
947 return 0;
948 }
949
950 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
951 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
952 {
953 struct net *net = sock_net(skb->sk);
954 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
955 struct xfrm_dump_info info;
956
957 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
958 sizeof(cb->args) - sizeof(cb->args[0]));
959
960 info.in_skb = cb->skb;
961 info.out_skb = skb;
962 info.nlmsg_seq = cb->nlh->nlmsg_seq;
963 info.nlmsg_flags = NLM_F_MULTI;
964
965 if (!cb->args[0]) {
966 struct nlattr *attrs[XFRMA_MAX+1];
967 struct xfrm_address_filter *filter = NULL;
968 u8 proto = 0;
969 int err;
970
971 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
972 NULL);
973 if (err < 0)
974 return err;
975
976 if (attrs[XFRMA_ADDRESS_FILTER]) {
977 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
978 sizeof(*filter), GFP_KERNEL);
979 if (filter == NULL)
980 return -ENOMEM;
981 }
982
983 if (attrs[XFRMA_PROTO])
984 proto = nla_get_u8(attrs[XFRMA_PROTO]);
985
986 xfrm_state_walk_init(walk, proto, filter);
987 cb->args[0] = 1;
988 }
989
990 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
991
992 return skb->len;
993 }
994
995 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
996 struct xfrm_state *x, u32 seq)
997 {
998 struct xfrm_dump_info info;
999 struct sk_buff *skb;
1000 int err;
1001
1002 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1003 if (!skb)
1004 return ERR_PTR(-ENOMEM);
1005
1006 info.in_skb = in_skb;
1007 info.out_skb = skb;
1008 info.nlmsg_seq = seq;
1009 info.nlmsg_flags = 0;
1010
1011 err = dump_one_state(x, 0, &info);
1012 if (err) {
1013 kfree_skb(skb);
1014 return ERR_PTR(err);
1015 }
1016
1017 return skb;
1018 }
1019
1020 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1021 * Must be called with RCU read lock.
1022 */
1023 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1024 u32 pid, unsigned int group)
1025 {
1026 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1027
1028 if (nlsk)
1029 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1030 else
1031 return -1;
1032 }
1033
1034 static inline unsigned int xfrm_spdinfo_msgsize(void)
1035 {
1036 return NLMSG_ALIGN(4)
1037 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1038 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1039 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1040 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1041 }
1042
1043 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1044 u32 portid, u32 seq, u32 flags)
1045 {
1046 struct xfrmk_spdinfo si;
1047 struct xfrmu_spdinfo spc;
1048 struct xfrmu_spdhinfo sph;
1049 struct xfrmu_spdhthresh spt4, spt6;
1050 struct nlmsghdr *nlh;
1051 int err;
1052 u32 *f;
1053 unsigned lseq;
1054
1055 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1056 if (nlh == NULL) /* shouldn't really happen ... */
1057 return -EMSGSIZE;
1058
1059 f = nlmsg_data(nlh);
1060 *f = flags;
1061 xfrm_spd_getinfo(net, &si);
1062 spc.incnt = si.incnt;
1063 spc.outcnt = si.outcnt;
1064 spc.fwdcnt = si.fwdcnt;
1065 spc.inscnt = si.inscnt;
1066 spc.outscnt = si.outscnt;
1067 spc.fwdscnt = si.fwdscnt;
1068 sph.spdhcnt = si.spdhcnt;
1069 sph.spdhmcnt = si.spdhmcnt;
1070
1071 do {
1072 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1073
1074 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1075 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1076 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1077 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1078 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1079
1080 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1081 if (!err)
1082 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1083 if (!err)
1084 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1085 if (!err)
1086 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1087 if (err) {
1088 nlmsg_cancel(skb, nlh);
1089 return err;
1090 }
1091
1092 nlmsg_end(skb, nlh);
1093 return 0;
1094 }
1095
1096 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1097 struct nlattr **attrs)
1098 {
1099 struct net *net = sock_net(skb->sk);
1100 struct xfrmu_spdhthresh *thresh4 = NULL;
1101 struct xfrmu_spdhthresh *thresh6 = NULL;
1102
1103 /* selector prefixlen thresholds to hash policies */
1104 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1105 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1106
1107 if (nla_len(rta) < sizeof(*thresh4))
1108 return -EINVAL;
1109 thresh4 = nla_data(rta);
1110 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1111 return -EINVAL;
1112 }
1113 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1114 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1115
1116 if (nla_len(rta) < sizeof(*thresh6))
1117 return -EINVAL;
1118 thresh6 = nla_data(rta);
1119 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1120 return -EINVAL;
1121 }
1122
1123 if (thresh4 || thresh6) {
1124 write_seqlock(&net->xfrm.policy_hthresh.lock);
1125 if (thresh4) {
1126 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1127 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1128 }
1129 if (thresh6) {
1130 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1131 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1132 }
1133 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1134
1135 xfrm_policy_hash_rebuild(net);
1136 }
1137
1138 return 0;
1139 }
1140
1141 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1142 struct nlattr **attrs)
1143 {
1144 struct net *net = sock_net(skb->sk);
1145 struct sk_buff *r_skb;
1146 u32 *flags = nlmsg_data(nlh);
1147 u32 sportid = NETLINK_CB(skb).portid;
1148 u32 seq = nlh->nlmsg_seq;
1149 int err;
1150
1151 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1152 if (r_skb == NULL)
1153 return -ENOMEM;
1154
1155 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1156 BUG_ON(err < 0);
1157
1158 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1159 }
1160
1161 static inline unsigned int xfrm_sadinfo_msgsize(void)
1162 {
1163 return NLMSG_ALIGN(4)
1164 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1165 + nla_total_size(4); /* XFRMA_SAD_CNT */
1166 }
1167
1168 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1169 u32 portid, u32 seq, u32 flags)
1170 {
1171 struct xfrmk_sadinfo si;
1172 struct xfrmu_sadhinfo sh;
1173 struct nlmsghdr *nlh;
1174 int err;
1175 u32 *f;
1176
1177 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1178 if (nlh == NULL) /* shouldn't really happen ... */
1179 return -EMSGSIZE;
1180
1181 f = nlmsg_data(nlh);
1182 *f = flags;
1183 xfrm_sad_getinfo(net, &si);
1184
1185 sh.sadhmcnt = si.sadhmcnt;
1186 sh.sadhcnt = si.sadhcnt;
1187
1188 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1189 if (!err)
1190 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1191 if (err) {
1192 nlmsg_cancel(skb, nlh);
1193 return err;
1194 }
1195
1196 nlmsg_end(skb, nlh);
1197 return 0;
1198 }
1199
1200 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1201 struct nlattr **attrs)
1202 {
1203 struct net *net = sock_net(skb->sk);
1204 struct sk_buff *r_skb;
1205 u32 *flags = nlmsg_data(nlh);
1206 u32 sportid = NETLINK_CB(skb).portid;
1207 u32 seq = nlh->nlmsg_seq;
1208 int err;
1209
1210 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1211 if (r_skb == NULL)
1212 return -ENOMEM;
1213
1214 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1215 BUG_ON(err < 0);
1216
1217 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1218 }
1219
1220 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1221 struct nlattr **attrs)
1222 {
1223 struct net *net = sock_net(skb->sk);
1224 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1225 struct xfrm_state *x;
1226 struct sk_buff *resp_skb;
1227 int err = -ESRCH;
1228
1229 x = xfrm_user_state_lookup(net, p, attrs, &err);
1230 if (x == NULL)
1231 goto out_noput;
1232
1233 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1234 if (IS_ERR(resp_skb)) {
1235 err = PTR_ERR(resp_skb);
1236 } else {
1237 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1238 }
1239 xfrm_state_put(x);
1240 out_noput:
1241 return err;
1242 }
1243
1244 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1245 struct nlattr **attrs)
1246 {
1247 struct net *net = sock_net(skb->sk);
1248 struct xfrm_state *x;
1249 struct xfrm_userspi_info *p;
1250 struct sk_buff *resp_skb;
1251 xfrm_address_t *daddr;
1252 int family;
1253 int err;
1254 u32 mark;
1255 struct xfrm_mark m;
1256
1257 p = nlmsg_data(nlh);
1258 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1259 if (err)
1260 goto out_noput;
1261
1262 family = p->info.family;
1263 daddr = &p->info.id.daddr;
1264
1265 x = NULL;
1266
1267 mark = xfrm_mark_get(attrs, &m);
1268 if (p->info.seq) {
1269 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1270 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1271 xfrm_state_put(x);
1272 x = NULL;
1273 }
1274 }
1275
1276 if (!x)
1277 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1278 p->info.id.proto, daddr,
1279 &p->info.saddr, 1,
1280 family);
1281 err = -ENOENT;
1282 if (x == NULL)
1283 goto out_noput;
1284
1285 err = xfrm_alloc_spi(x, p->min, p->max);
1286 if (err)
1287 goto out;
1288
1289 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1290 if (IS_ERR(resp_skb)) {
1291 err = PTR_ERR(resp_skb);
1292 goto out;
1293 }
1294
1295 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1296
1297 out:
1298 xfrm_state_put(x);
1299 out_noput:
1300 return err;
1301 }
1302
1303 static int verify_policy_dir(u8 dir)
1304 {
1305 switch (dir) {
1306 case XFRM_POLICY_IN:
1307 case XFRM_POLICY_OUT:
1308 case XFRM_POLICY_FWD:
1309 break;
1310
1311 default:
1312 return -EINVAL;
1313 }
1314
1315 return 0;
1316 }
1317
1318 static int verify_policy_type(u8 type)
1319 {
1320 switch (type) {
1321 case XFRM_POLICY_TYPE_MAIN:
1322 #ifdef CONFIG_XFRM_SUB_POLICY
1323 case XFRM_POLICY_TYPE_SUB:
1324 #endif
1325 break;
1326
1327 default:
1328 return -EINVAL;
1329 }
1330
1331 return 0;
1332 }
1333
1334 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1335 {
1336 int ret;
1337
1338 switch (p->share) {
1339 case XFRM_SHARE_ANY:
1340 case XFRM_SHARE_SESSION:
1341 case XFRM_SHARE_USER:
1342 case XFRM_SHARE_UNIQUE:
1343 break;
1344
1345 default:
1346 return -EINVAL;
1347 }
1348
1349 switch (p->action) {
1350 case XFRM_POLICY_ALLOW:
1351 case XFRM_POLICY_BLOCK:
1352 break;
1353
1354 default:
1355 return -EINVAL;
1356 }
1357
1358 switch (p->sel.family) {
1359 case AF_INET:
1360 break;
1361
1362 case AF_INET6:
1363 #if IS_ENABLED(CONFIG_IPV6)
1364 break;
1365 #else
1366 return -EAFNOSUPPORT;
1367 #endif
1368
1369 default:
1370 return -EINVAL;
1371 }
1372
1373 ret = verify_policy_dir(p->dir);
1374 if (ret)
1375 return ret;
1376 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1377 return -EINVAL;
1378
1379 return 0;
1380 }
1381
1382 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1383 {
1384 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1385 struct xfrm_user_sec_ctx *uctx;
1386
1387 if (!rt)
1388 return 0;
1389
1390 uctx = nla_data(rt);
1391 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1392 }
1393
1394 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1395 int nr)
1396 {
1397 int i;
1398
1399 xp->xfrm_nr = nr;
1400 for (i = 0; i < nr; i++, ut++) {
1401 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1402
1403 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1404 memcpy(&t->saddr, &ut->saddr,
1405 sizeof(xfrm_address_t));
1406 t->reqid = ut->reqid;
1407 t->mode = ut->mode;
1408 t->share = ut->share;
1409 t->optional = ut->optional;
1410 t->aalgos = ut->aalgos;
1411 t->ealgos = ut->ealgos;
1412 t->calgos = ut->calgos;
1413 /* If all masks are ~0, then we allow all algorithms. */
1414 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1415 t->encap_family = ut->family;
1416 }
1417 }
1418
1419 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1420 {
1421 u16 prev_family;
1422 int i;
1423
1424 if (nr > XFRM_MAX_DEPTH)
1425 return -EINVAL;
1426
1427 prev_family = family;
1428
1429 for (i = 0; i < nr; i++) {
1430 /* We never validated the ut->family value, so many
1431 * applications simply leave it at zero. The check was
1432 * never made and ut->family was ignored because all
1433 * templates could be assumed to have the same family as
1434 * the policy itself. Now that we will have ipv4-in-ipv6
1435 * and ipv6-in-ipv4 tunnels, this is no longer true.
1436 */
1437 if (!ut[i].family)
1438 ut[i].family = family;
1439
1440 if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
1441 (ut[i].family != prev_family))
1442 return -EINVAL;
1443
1444 prev_family = ut[i].family;
1445
1446 switch (ut[i].family) {
1447 case AF_INET:
1448 break;
1449 #if IS_ENABLED(CONFIG_IPV6)
1450 case AF_INET6:
1451 break;
1452 #endif
1453 default:
1454 return -EINVAL;
1455 }
1456
1457 switch (ut[i].id.proto) {
1458 case IPPROTO_AH:
1459 case IPPROTO_ESP:
1460 case IPPROTO_COMP:
1461 #if IS_ENABLED(CONFIG_IPV6)
1462 case IPPROTO_ROUTING:
1463 case IPPROTO_DSTOPTS:
1464 #endif
1465 case IPSEC_PROTO_ANY:
1466 break;
1467 default:
1468 return -EINVAL;
1469 }
1470
1471 }
1472
1473 return 0;
1474 }
1475
1476 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1477 {
1478 struct nlattr *rt = attrs[XFRMA_TMPL];
1479
1480 if (!rt) {
1481 pol->xfrm_nr = 0;
1482 } else {
1483 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1484 int nr = nla_len(rt) / sizeof(*utmpl);
1485 int err;
1486
1487 err = validate_tmpl(nr, utmpl, pol->family);
1488 if (err)
1489 return err;
1490
1491 copy_templates(pol, utmpl, nr);
1492 }
1493 return 0;
1494 }
1495
1496 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1497 {
1498 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1499 struct xfrm_userpolicy_type *upt;
1500 u8 type = XFRM_POLICY_TYPE_MAIN;
1501 int err;
1502
1503 if (rt) {
1504 upt = nla_data(rt);
1505 type = upt->type;
1506 }
1507
1508 err = verify_policy_type(type);
1509 if (err)
1510 return err;
1511
1512 *tp = type;
1513 return 0;
1514 }
1515
1516 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1517 {
1518 xp->priority = p->priority;
1519 xp->index = p->index;
1520 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1521 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1522 xp->action = p->action;
1523 xp->flags = p->flags;
1524 xp->family = p->sel.family;
1525 /* XXX xp->share = p->share; */
1526 }
1527
1528 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1529 {
1530 memset(p, 0, sizeof(*p));
1531 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1532 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1533 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1534 p->priority = xp->priority;
1535 p->index = xp->index;
1536 p->sel.family = xp->family;
1537 p->dir = dir;
1538 p->action = xp->action;
1539 p->flags = xp->flags;
1540 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1541 }
1542
1543 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1544 {
1545 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1546 int err;
1547
1548 if (!xp) {
1549 *errp = -ENOMEM;
1550 return NULL;
1551 }
1552
1553 copy_from_user_policy(xp, p);
1554
1555 err = copy_from_user_policy_type(&xp->type, attrs);
1556 if (err)
1557 goto error;
1558
1559 if (!(err = copy_from_user_tmpl(xp, attrs)))
1560 err = copy_from_user_sec_ctx(xp, attrs);
1561 if (err)
1562 goto error;
1563
1564 xfrm_mark_get(attrs, &xp->mark);
1565
1566 return xp;
1567 error:
1568 *errp = err;
1569 xp->walk.dead = 1;
1570 xfrm_policy_destroy(xp);
1571 return NULL;
1572 }
1573
1574 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1575 struct nlattr **attrs)
1576 {
1577 struct net *net = sock_net(skb->sk);
1578 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1579 struct xfrm_policy *xp;
1580 struct km_event c;
1581 int err;
1582 int excl;
1583
1584 err = verify_newpolicy_info(p);
1585 if (err)
1586 return err;
1587 err = verify_sec_ctx_len(attrs);
1588 if (err)
1589 return err;
1590
1591 xp = xfrm_policy_construct(net, p, attrs, &err);
1592 if (!xp)
1593 return err;
1594
1595 /* shouldn't excl be based on nlh flags??
1596 * Aha! this is anti-netlink really i.e more pfkey derived
1597 * in netlink excl is a flag and you wouldnt need
1598 * a type XFRM_MSG_UPDPOLICY - JHS */
1599 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1600 err = xfrm_policy_insert(p->dir, xp, excl);
1601 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1602
1603 if (err) {
1604 security_xfrm_policy_free(xp->security);
1605 kfree(xp);
1606 return err;
1607 }
1608
1609 c.event = nlh->nlmsg_type;
1610 c.seq = nlh->nlmsg_seq;
1611 c.portid = nlh->nlmsg_pid;
1612 km_policy_notify(xp, p->dir, &c);
1613
1614 xfrm_pol_put(xp);
1615
1616 return 0;
1617 }
1618
1619 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1620 {
1621 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1622 int i;
1623
1624 if (xp->xfrm_nr == 0)
1625 return 0;
1626
1627 for (i = 0; i < xp->xfrm_nr; i++) {
1628 struct xfrm_user_tmpl *up = &vec[i];
1629 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1630
1631 memset(up, 0, sizeof(*up));
1632 memcpy(&up->id, &kp->id, sizeof(up->id));
1633 up->family = kp->encap_family;
1634 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1635 up->reqid = kp->reqid;
1636 up->mode = kp->mode;
1637 up->share = kp->share;
1638 up->optional = kp->optional;
1639 up->aalgos = kp->aalgos;
1640 up->ealgos = kp->ealgos;
1641 up->calgos = kp->calgos;
1642 }
1643
1644 return nla_put(skb, XFRMA_TMPL,
1645 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1646 }
1647
1648 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1649 {
1650 if (x->security) {
1651 return copy_sec_ctx(x->security, skb);
1652 }
1653 return 0;
1654 }
1655
1656 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1657 {
1658 if (xp->security)
1659 return copy_sec_ctx(xp->security, skb);
1660 return 0;
1661 }
1662 static inline unsigned int userpolicy_type_attrsize(void)
1663 {
1664 #ifdef CONFIG_XFRM_SUB_POLICY
1665 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1666 #else
1667 return 0;
1668 #endif
1669 }
1670
1671 #ifdef CONFIG_XFRM_SUB_POLICY
1672 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1673 {
1674 struct xfrm_userpolicy_type upt = {
1675 .type = type,
1676 };
1677
1678 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1679 }
1680
1681 #else
1682 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1683 {
1684 return 0;
1685 }
1686 #endif
1687
1688 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1689 {
1690 struct xfrm_dump_info *sp = ptr;
1691 struct xfrm_userpolicy_info *p;
1692 struct sk_buff *in_skb = sp->in_skb;
1693 struct sk_buff *skb = sp->out_skb;
1694 struct nlmsghdr *nlh;
1695 int err;
1696
1697 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1698 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1699 if (nlh == NULL)
1700 return -EMSGSIZE;
1701
1702 p = nlmsg_data(nlh);
1703 copy_to_user_policy(xp, p, dir);
1704 err = copy_to_user_tmpl(xp, skb);
1705 if (!err)
1706 err = copy_to_user_sec_ctx(xp, skb);
1707 if (!err)
1708 err = copy_to_user_policy_type(xp->type, skb);
1709 if (!err)
1710 err = xfrm_mark_put(skb, &xp->mark);
1711 if (err) {
1712 nlmsg_cancel(skb, nlh);
1713 return err;
1714 }
1715 nlmsg_end(skb, nlh);
1716 return 0;
1717 }
1718
1719 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1720 {
1721 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1722 struct net *net = sock_net(cb->skb->sk);
1723
1724 xfrm_policy_walk_done(walk, net);
1725 return 0;
1726 }
1727
1728 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1729 {
1730 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1731
1732 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1733
1734 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1735 return 0;
1736 }
1737
1738 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1739 {
1740 struct net *net = sock_net(skb->sk);
1741 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1742 struct xfrm_dump_info info;
1743
1744 info.in_skb = cb->skb;
1745 info.out_skb = skb;
1746 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1747 info.nlmsg_flags = NLM_F_MULTI;
1748
1749 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1750
1751 return skb->len;
1752 }
1753
1754 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1755 struct xfrm_policy *xp,
1756 int dir, u32 seq)
1757 {
1758 struct xfrm_dump_info info;
1759 struct sk_buff *skb;
1760 int err;
1761
1762 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1763 if (!skb)
1764 return ERR_PTR(-ENOMEM);
1765
1766 info.in_skb = in_skb;
1767 info.out_skb = skb;
1768 info.nlmsg_seq = seq;
1769 info.nlmsg_flags = 0;
1770
1771 err = dump_one_policy(xp, dir, 0, &info);
1772 if (err) {
1773 kfree_skb(skb);
1774 return ERR_PTR(err);
1775 }
1776
1777 return skb;
1778 }
1779
1780 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1781 struct nlattr **attrs)
1782 {
1783 struct net *net = sock_net(skb->sk);
1784 struct xfrm_policy *xp;
1785 struct xfrm_userpolicy_id *p;
1786 u8 type = XFRM_POLICY_TYPE_MAIN;
1787 int err;
1788 struct km_event c;
1789 int delete;
1790 struct xfrm_mark m;
1791 u32 mark = xfrm_mark_get(attrs, &m);
1792
1793 p = nlmsg_data(nlh);
1794 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1795
1796 err = copy_from_user_policy_type(&type, attrs);
1797 if (err)
1798 return err;
1799
1800 err = verify_policy_dir(p->dir);
1801 if (err)
1802 return err;
1803
1804 if (p->index)
1805 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1806 else {
1807 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1808 struct xfrm_sec_ctx *ctx;
1809
1810 err = verify_sec_ctx_len(attrs);
1811 if (err)
1812 return err;
1813
1814 ctx = NULL;
1815 if (rt) {
1816 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1817
1818 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1819 if (err)
1820 return err;
1821 }
1822 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1823 ctx, delete, &err);
1824 security_xfrm_policy_free(ctx);
1825 }
1826 if (xp == NULL)
1827 return -ENOENT;
1828
1829 if (!delete) {
1830 struct sk_buff *resp_skb;
1831
1832 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1833 if (IS_ERR(resp_skb)) {
1834 err = PTR_ERR(resp_skb);
1835 } else {
1836 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1837 NETLINK_CB(skb).portid);
1838 }
1839 } else {
1840 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1841
1842 if (err != 0)
1843 goto out;
1844
1845 c.data.byid = p->index;
1846 c.event = nlh->nlmsg_type;
1847 c.seq = nlh->nlmsg_seq;
1848 c.portid = nlh->nlmsg_pid;
1849 km_policy_notify(xp, p->dir, &c);
1850 }
1851
1852 out:
1853 xfrm_pol_put(xp);
1854 return err;
1855 }
1856
1857 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1858 struct nlattr **attrs)
1859 {
1860 struct net *net = sock_net(skb->sk);
1861 struct km_event c;
1862 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1863 int err;
1864
1865 err = xfrm_state_flush(net, p->proto, true);
1866 if (err) {
1867 if (err == -ESRCH) /* empty table */
1868 return 0;
1869 return err;
1870 }
1871 c.data.proto = p->proto;
1872 c.event = nlh->nlmsg_type;
1873 c.seq = nlh->nlmsg_seq;
1874 c.portid = nlh->nlmsg_pid;
1875 c.net = net;
1876 km_state_notify(NULL, &c);
1877
1878 return 0;
1879 }
1880
1881 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1882 {
1883 unsigned int replay_size = x->replay_esn ?
1884 xfrm_replay_state_esn_len(x->replay_esn) :
1885 sizeof(struct xfrm_replay_state);
1886
1887 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1888 + nla_total_size(replay_size)
1889 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1890 + nla_total_size(sizeof(struct xfrm_mark))
1891 + nla_total_size(4) /* XFRM_AE_RTHR */
1892 + nla_total_size(4); /* XFRM_AE_ETHR */
1893 }
1894
1895 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1896 {
1897 struct xfrm_aevent_id *id;
1898 struct nlmsghdr *nlh;
1899 int err;
1900
1901 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1902 if (nlh == NULL)
1903 return -EMSGSIZE;
1904
1905 id = nlmsg_data(nlh);
1906 memset(&id->sa_id, 0, sizeof(id->sa_id));
1907 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1908 id->sa_id.spi = x->id.spi;
1909 id->sa_id.family = x->props.family;
1910 id->sa_id.proto = x->id.proto;
1911 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1912 id->reqid = x->props.reqid;
1913 id->flags = c->data.aevent;
1914
1915 if (x->replay_esn) {
1916 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1917 xfrm_replay_state_esn_len(x->replay_esn),
1918 x->replay_esn);
1919 } else {
1920 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1921 &x->replay);
1922 }
1923 if (err)
1924 goto out_cancel;
1925 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1926 XFRMA_PAD);
1927 if (err)
1928 goto out_cancel;
1929
1930 if (id->flags & XFRM_AE_RTHR) {
1931 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1932 if (err)
1933 goto out_cancel;
1934 }
1935 if (id->flags & XFRM_AE_ETHR) {
1936 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1937 x->replay_maxage * 10 / HZ);
1938 if (err)
1939 goto out_cancel;
1940 }
1941 err = xfrm_mark_put(skb, &x->mark);
1942 if (err)
1943 goto out_cancel;
1944
1945 nlmsg_end(skb, nlh);
1946 return 0;
1947
1948 out_cancel:
1949 nlmsg_cancel(skb, nlh);
1950 return err;
1951 }
1952
1953 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1954 struct nlattr **attrs)
1955 {
1956 struct net *net = sock_net(skb->sk);
1957 struct xfrm_state *x;
1958 struct sk_buff *r_skb;
1959 int err;
1960 struct km_event c;
1961 u32 mark;
1962 struct xfrm_mark m;
1963 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1964 struct xfrm_usersa_id *id = &p->sa_id;
1965
1966 mark = xfrm_mark_get(attrs, &m);
1967
1968 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1969 if (x == NULL)
1970 return -ESRCH;
1971
1972 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1973 if (r_skb == NULL) {
1974 xfrm_state_put(x);
1975 return -ENOMEM;
1976 }
1977
1978 /*
1979 * XXX: is this lock really needed - none of the other
1980 * gets lock (the concern is things getting updated
1981 * while we are still reading) - jhs
1982 */
1983 spin_lock_bh(&x->lock);
1984 c.data.aevent = p->flags;
1985 c.seq = nlh->nlmsg_seq;
1986 c.portid = nlh->nlmsg_pid;
1987
1988 err = build_aevent(r_skb, x, &c);
1989 BUG_ON(err < 0);
1990
1991 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1992 spin_unlock_bh(&x->lock);
1993 xfrm_state_put(x);
1994 return err;
1995 }
1996
1997 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1998 struct nlattr **attrs)
1999 {
2000 struct net *net = sock_net(skb->sk);
2001 struct xfrm_state *x;
2002 struct km_event c;
2003 int err = -EINVAL;
2004 u32 mark = 0;
2005 struct xfrm_mark m;
2006 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2007 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2008 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2009 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2010 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2011 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2012
2013 if (!lt && !rp && !re && !et && !rt)
2014 return err;
2015
2016 /* pedantic mode - thou shalt sayeth replaceth */
2017 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2018 return err;
2019
2020 mark = xfrm_mark_get(attrs, &m);
2021
2022 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2023 if (x == NULL)
2024 return -ESRCH;
2025
2026 if (x->km.state != XFRM_STATE_VALID)
2027 goto out;
2028
2029 err = xfrm_replay_verify_len(x->replay_esn, re);
2030 if (err)
2031 goto out;
2032
2033 spin_lock_bh(&x->lock);
2034 xfrm_update_ae_params(x, attrs, 1);
2035 spin_unlock_bh(&x->lock);
2036
2037 c.event = nlh->nlmsg_type;
2038 c.seq = nlh->nlmsg_seq;
2039 c.portid = nlh->nlmsg_pid;
2040 c.data.aevent = XFRM_AE_CU;
2041 km_state_notify(x, &c);
2042 err = 0;
2043 out:
2044 xfrm_state_put(x);
2045 return err;
2046 }
2047
2048 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2049 struct nlattr **attrs)
2050 {
2051 struct net *net = sock_net(skb->sk);
2052 struct km_event c;
2053 u8 type = XFRM_POLICY_TYPE_MAIN;
2054 int err;
2055
2056 err = copy_from_user_policy_type(&type, attrs);
2057 if (err)
2058 return err;
2059
2060 err = xfrm_policy_flush(net, type, true);
2061 if (err) {
2062 if (err == -ESRCH) /* empty table */
2063 return 0;
2064 return err;
2065 }
2066
2067 c.data.type = type;
2068 c.event = nlh->nlmsg_type;
2069 c.seq = nlh->nlmsg_seq;
2070 c.portid = nlh->nlmsg_pid;
2071 c.net = net;
2072 km_policy_notify(NULL, 0, &c);
2073 return 0;
2074 }
2075
2076 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2077 struct nlattr **attrs)
2078 {
2079 struct net *net = sock_net(skb->sk);
2080 struct xfrm_policy *xp;
2081 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2082 struct xfrm_userpolicy_info *p = &up->pol;
2083 u8 type = XFRM_POLICY_TYPE_MAIN;
2084 int err = -ENOENT;
2085 struct xfrm_mark m;
2086 u32 mark = xfrm_mark_get(attrs, &m);
2087
2088 err = copy_from_user_policy_type(&type, attrs);
2089 if (err)
2090 return err;
2091
2092 err = verify_policy_dir(p->dir);
2093 if (err)
2094 return err;
2095
2096 if (p->index)
2097 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2098 else {
2099 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2100 struct xfrm_sec_ctx *ctx;
2101
2102 err = verify_sec_ctx_len(attrs);
2103 if (err)
2104 return err;
2105
2106 ctx = NULL;
2107 if (rt) {
2108 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2109
2110 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2111 if (err)
2112 return err;
2113 }
2114 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2115 &p->sel, ctx, 0, &err);
2116 security_xfrm_policy_free(ctx);
2117 }
2118 if (xp == NULL)
2119 return -ENOENT;
2120
2121 if (unlikely(xp->walk.dead))
2122 goto out;
2123
2124 err = 0;
2125 if (up->hard) {
2126 xfrm_policy_delete(xp, p->dir);
2127 xfrm_audit_policy_delete(xp, 1, true);
2128 }
2129 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2130
2131 out:
2132 xfrm_pol_put(xp);
2133 return err;
2134 }
2135
2136 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2137 struct nlattr **attrs)
2138 {
2139 struct net *net = sock_net(skb->sk);
2140 struct xfrm_state *x;
2141 int err;
2142 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2143 struct xfrm_usersa_info *p = &ue->state;
2144 struct xfrm_mark m;
2145 u32 mark = xfrm_mark_get(attrs, &m);
2146
2147 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2148
2149 err = -ENOENT;
2150 if (x == NULL)
2151 return err;
2152
2153 spin_lock_bh(&x->lock);
2154 err = -EINVAL;
2155 if (x->km.state != XFRM_STATE_VALID)
2156 goto out;
2157 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2158
2159 if (ue->hard) {
2160 __xfrm_state_delete(x);
2161 xfrm_audit_state_delete(x, 1, true);
2162 }
2163 err = 0;
2164 out:
2165 spin_unlock_bh(&x->lock);
2166 xfrm_state_put(x);
2167 return err;
2168 }
2169
2170 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2171 struct nlattr **attrs)
2172 {
2173 struct net *net = sock_net(skb->sk);
2174 struct xfrm_policy *xp;
2175 struct xfrm_user_tmpl *ut;
2176 int i;
2177 struct nlattr *rt = attrs[XFRMA_TMPL];
2178 struct xfrm_mark mark;
2179
2180 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2181 struct xfrm_state *x = xfrm_state_alloc(net);
2182 int err = -ENOMEM;
2183
2184 if (!x)
2185 goto nomem;
2186
2187 xfrm_mark_get(attrs, &mark);
2188
2189 err = verify_newpolicy_info(&ua->policy);
2190 if (err)
2191 goto free_state;
2192
2193 /* build an XP */
2194 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2195 if (!xp)
2196 goto free_state;
2197
2198 memcpy(&x->id, &ua->id, sizeof(ua->id));
2199 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2200 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2201 xp->mark.m = x->mark.m = mark.m;
2202 xp->mark.v = x->mark.v = mark.v;
2203 ut = nla_data(rt);
2204 /* extract the templates and for each call km_key */
2205 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2206 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2207 memcpy(&x->id, &t->id, sizeof(x->id));
2208 x->props.mode = t->mode;
2209 x->props.reqid = t->reqid;
2210 x->props.family = ut->family;
2211 t->aalgos = ua->aalgos;
2212 t->ealgos = ua->ealgos;
2213 t->calgos = ua->calgos;
2214 err = km_query(x, t, xp);
2215
2216 }
2217
2218 kfree(x);
2219 kfree(xp);
2220
2221 return 0;
2222
2223 free_state:
2224 kfree(x);
2225 nomem:
2226 return err;
2227 }
2228
2229 #ifdef CONFIG_XFRM_MIGRATE
2230 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2231 struct xfrm_kmaddress *k,
2232 struct nlattr **attrs, int *num)
2233 {
2234 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2235 struct xfrm_user_migrate *um;
2236 int i, num_migrate;
2237
2238 if (k != NULL) {
2239 struct xfrm_user_kmaddress *uk;
2240
2241 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2242 memcpy(&k->local, &uk->local, sizeof(k->local));
2243 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2244 k->family = uk->family;
2245 k->reserved = uk->reserved;
2246 }
2247
2248 um = nla_data(rt);
2249 num_migrate = nla_len(rt) / sizeof(*um);
2250
2251 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2252 return -EINVAL;
2253
2254 for (i = 0; i < num_migrate; i++, um++, ma++) {
2255 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2256 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2257 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2258 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2259
2260 ma->proto = um->proto;
2261 ma->mode = um->mode;
2262 ma->reqid = um->reqid;
2263
2264 ma->old_family = um->old_family;
2265 ma->new_family = um->new_family;
2266 }
2267
2268 *num = i;
2269 return 0;
2270 }
2271
2272 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2273 struct nlattr **attrs)
2274 {
2275 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2276 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2277 struct xfrm_kmaddress km, *kmp;
2278 u8 type;
2279 int err;
2280 int n = 0;
2281 struct net *net = sock_net(skb->sk);
2282 struct xfrm_encap_tmpl *encap = NULL;
2283
2284 if (attrs[XFRMA_MIGRATE] == NULL)
2285 return -EINVAL;
2286
2287 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2288
2289 err = copy_from_user_policy_type(&type, attrs);
2290 if (err)
2291 return err;
2292
2293 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2294 if (err)
2295 return err;
2296
2297 if (!n)
2298 return 0;
2299
2300 if (attrs[XFRMA_ENCAP]) {
2301 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2302 sizeof(*encap), GFP_KERNEL);
2303 if (!encap)
2304 return 0;
2305 }
2306
2307 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2308
2309 kfree(encap);
2310
2311 return err;
2312 }
2313 #else
2314 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2315 struct nlattr **attrs)
2316 {
2317 return -ENOPROTOOPT;
2318 }
2319 #endif
2320
2321 #ifdef CONFIG_XFRM_MIGRATE
2322 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2323 {
2324 struct xfrm_user_migrate um;
2325
2326 memset(&um, 0, sizeof(um));
2327 um.proto = m->proto;
2328 um.mode = m->mode;
2329 um.reqid = m->reqid;
2330 um.old_family = m->old_family;
2331 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2332 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2333 um.new_family = m->new_family;
2334 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2335 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2336
2337 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2338 }
2339
2340 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2341 {
2342 struct xfrm_user_kmaddress uk;
2343
2344 memset(&uk, 0, sizeof(uk));
2345 uk.family = k->family;
2346 uk.reserved = k->reserved;
2347 memcpy(&uk.local, &k->local, sizeof(uk.local));
2348 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2349
2350 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2351 }
2352
2353 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2354 int with_encp)
2355 {
2356 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2357 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2358 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2359 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2360 + userpolicy_type_attrsize();
2361 }
2362
2363 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2364 int num_migrate, const struct xfrm_kmaddress *k,
2365 const struct xfrm_selector *sel,
2366 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2367 {
2368 const struct xfrm_migrate *mp;
2369 struct xfrm_userpolicy_id *pol_id;
2370 struct nlmsghdr *nlh;
2371 int i, err;
2372
2373 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2374 if (nlh == NULL)
2375 return -EMSGSIZE;
2376
2377 pol_id = nlmsg_data(nlh);
2378 /* copy data from selector, dir, and type to the pol_id */
2379 memset(pol_id, 0, sizeof(*pol_id));
2380 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2381 pol_id->dir = dir;
2382
2383 if (k != NULL) {
2384 err = copy_to_user_kmaddress(k, skb);
2385 if (err)
2386 goto out_cancel;
2387 }
2388 if (encap) {
2389 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2390 if (err)
2391 goto out_cancel;
2392 }
2393 err = copy_to_user_policy_type(type, skb);
2394 if (err)
2395 goto out_cancel;
2396 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2397 err = copy_to_user_migrate(mp, skb);
2398 if (err)
2399 goto out_cancel;
2400 }
2401
2402 nlmsg_end(skb, nlh);
2403 return 0;
2404
2405 out_cancel:
2406 nlmsg_cancel(skb, nlh);
2407 return err;
2408 }
2409
2410 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2411 const struct xfrm_migrate *m, int num_migrate,
2412 const struct xfrm_kmaddress *k,
2413 const struct xfrm_encap_tmpl *encap)
2414 {
2415 struct net *net = &init_net;
2416 struct sk_buff *skb;
2417 int err;
2418
2419 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2420 GFP_ATOMIC);
2421 if (skb == NULL)
2422 return -ENOMEM;
2423
2424 /* build migrate */
2425 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2426 BUG_ON(err < 0);
2427
2428 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2429 }
2430 #else
2431 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2432 const struct xfrm_migrate *m, int num_migrate,
2433 const struct xfrm_kmaddress *k,
2434 const struct xfrm_encap_tmpl *encap)
2435 {
2436 return -ENOPROTOOPT;
2437 }
2438 #endif
2439
2440 #define XMSGSIZE(type) sizeof(struct type)
2441
2442 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2443 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2444 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2445 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2446 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2447 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2448 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2449 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2450 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2451 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2452 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2453 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2454 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2455 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2456 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2457 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2458 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2459 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2460 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2461 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2462 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2463 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2464 };
2465
2466 #undef XMSGSIZE
2467
2468 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2469 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2470 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2471 [XFRMA_LASTUSED] = { .type = NLA_U64},
2472 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2473 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2474 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2475 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2476 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2477 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2478 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2479 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2480 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2481 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2482 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2483 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2484 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2485 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2486 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2487 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2488 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2489 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2490 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2491 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2492 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2493 [XFRMA_PROTO] = { .type = NLA_U8 },
2494 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2495 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2496 [XFRMA_OUTPUT_MARK] = { .type = NLA_U32 },
2497 };
2498
2499 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2500 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2501 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2502 };
2503
2504 static const struct xfrm_link {
2505 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2506 int (*start)(struct netlink_callback *);
2507 int (*dump)(struct sk_buff *, struct netlink_callback *);
2508 int (*done)(struct netlink_callback *);
2509 const struct nla_policy *nla_pol;
2510 int nla_max;
2511 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2512 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2513 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2514 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2515 .dump = xfrm_dump_sa,
2516 .done = xfrm_dump_sa_done },
2517 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2518 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2519 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2520 .start = xfrm_dump_policy_start,
2521 .dump = xfrm_dump_policy,
2522 .done = xfrm_dump_policy_done },
2523 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2524 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2525 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2526 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2527 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2528 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2529 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2530 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2531 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2532 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2533 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2534 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2535 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2536 .nla_pol = xfrma_spd_policy,
2537 .nla_max = XFRMA_SPD_MAX },
2538 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2539 };
2540
2541 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2542 struct netlink_ext_ack *extack)
2543 {
2544 struct net *net = sock_net(skb->sk);
2545 struct nlattr *attrs[XFRMA_MAX+1];
2546 const struct xfrm_link *link;
2547 int type, err;
2548
2549 #ifdef CONFIG_COMPAT
2550 if (in_compat_syscall())
2551 return -EOPNOTSUPP;
2552 #endif
2553
2554 type = nlh->nlmsg_type;
2555 if (type > XFRM_MSG_MAX)
2556 return -EINVAL;
2557
2558 type -= XFRM_MSG_BASE;
2559 link = &xfrm_dispatch[type];
2560
2561 /* All operations require privileges, even GET */
2562 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2563 return -EPERM;
2564
2565 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2566 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2567 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2568 if (link->dump == NULL)
2569 return -EINVAL;
2570
2571 {
2572 struct netlink_dump_control c = {
2573 .start = link->start,
2574 .dump = link->dump,
2575 .done = link->done,
2576 };
2577 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2578 }
2579 }
2580
2581 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2582 link->nla_max ? : XFRMA_MAX,
2583 link->nla_pol ? : xfrma_policy, extack);
2584 if (err < 0)
2585 return err;
2586
2587 if (link->doit == NULL)
2588 return -EINVAL;
2589
2590 return link->doit(skb, nlh, attrs);
2591 }
2592
2593 static void xfrm_netlink_rcv(struct sk_buff *skb)
2594 {
2595 struct net *net = sock_net(skb->sk);
2596
2597 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2598 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2599 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2600 }
2601
2602 static inline unsigned int xfrm_expire_msgsize(void)
2603 {
2604 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2605 + nla_total_size(sizeof(struct xfrm_mark));
2606 }
2607
2608 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2609 {
2610 struct xfrm_user_expire *ue;
2611 struct nlmsghdr *nlh;
2612 int err;
2613
2614 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2615 if (nlh == NULL)
2616 return -EMSGSIZE;
2617
2618 ue = nlmsg_data(nlh);
2619 copy_to_user_state(x, &ue->state);
2620 ue->hard = (c->data.hard != 0) ? 1 : 0;
2621 /* clear the padding bytes */
2622 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2623
2624 err = xfrm_mark_put(skb, &x->mark);
2625 if (err)
2626 return err;
2627
2628 nlmsg_end(skb, nlh);
2629 return 0;
2630 }
2631
2632 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2633 {
2634 struct net *net = xs_net(x);
2635 struct sk_buff *skb;
2636
2637 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2638 if (skb == NULL)
2639 return -ENOMEM;
2640
2641 if (build_expire(skb, x, c) < 0) {
2642 kfree_skb(skb);
2643 return -EMSGSIZE;
2644 }
2645
2646 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2647 }
2648
2649 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2650 {
2651 struct net *net = xs_net(x);
2652 struct sk_buff *skb;
2653 int err;
2654
2655 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2656 if (skb == NULL)
2657 return -ENOMEM;
2658
2659 err = build_aevent(skb, x, c);
2660 BUG_ON(err < 0);
2661
2662 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2663 }
2664
2665 static int xfrm_notify_sa_flush(const struct km_event *c)
2666 {
2667 struct net *net = c->net;
2668 struct xfrm_usersa_flush *p;
2669 struct nlmsghdr *nlh;
2670 struct sk_buff *skb;
2671 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2672
2673 skb = nlmsg_new(len, GFP_ATOMIC);
2674 if (skb == NULL)
2675 return -ENOMEM;
2676
2677 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2678 if (nlh == NULL) {
2679 kfree_skb(skb);
2680 return -EMSGSIZE;
2681 }
2682
2683 p = nlmsg_data(nlh);
2684 p->proto = c->data.proto;
2685
2686 nlmsg_end(skb, nlh);
2687
2688 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2689 }
2690
2691 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2692 {
2693 unsigned int l = 0;
2694 if (x->aead)
2695 l += nla_total_size(aead_len(x->aead));
2696 if (x->aalg) {
2697 l += nla_total_size(sizeof(struct xfrm_algo) +
2698 (x->aalg->alg_key_len + 7) / 8);
2699 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2700 }
2701 if (x->ealg)
2702 l += nla_total_size(xfrm_alg_len(x->ealg));
2703 if (x->calg)
2704 l += nla_total_size(sizeof(*x->calg));
2705 if (x->encap)
2706 l += nla_total_size(sizeof(*x->encap));
2707 if (x->tfcpad)
2708 l += nla_total_size(sizeof(x->tfcpad));
2709 if (x->replay_esn)
2710 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2711 else
2712 l += nla_total_size(sizeof(struct xfrm_replay_state));
2713 if (x->security)
2714 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2715 x->security->ctx_len);
2716 if (x->coaddr)
2717 l += nla_total_size(sizeof(*x->coaddr));
2718 if (x->props.extra_flags)
2719 l += nla_total_size(sizeof(x->props.extra_flags));
2720 if (x->xso.dev)
2721 l += nla_total_size(sizeof(x->xso));
2722 if (x->props.output_mark)
2723 l += nla_total_size(sizeof(x->props.output_mark));
2724
2725 /* Must count x->lastused as it may become non-zero behind our back. */
2726 l += nla_total_size_64bit(sizeof(u64));
2727
2728 return l;
2729 }
2730
2731 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2732 {
2733 struct net *net = xs_net(x);
2734 struct xfrm_usersa_info *p;
2735 struct xfrm_usersa_id *id;
2736 struct nlmsghdr *nlh;
2737 struct sk_buff *skb;
2738 unsigned int len = xfrm_sa_len(x);
2739 unsigned int headlen;
2740 int err;
2741
2742 headlen = sizeof(*p);
2743 if (c->event == XFRM_MSG_DELSA) {
2744 len += nla_total_size(headlen);
2745 headlen = sizeof(*id);
2746 len += nla_total_size(sizeof(struct xfrm_mark));
2747 }
2748 len += NLMSG_ALIGN(headlen);
2749
2750 skb = nlmsg_new(len, GFP_ATOMIC);
2751 if (skb == NULL)
2752 return -ENOMEM;
2753
2754 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2755 err = -EMSGSIZE;
2756 if (nlh == NULL)
2757 goto out_free_skb;
2758
2759 p = nlmsg_data(nlh);
2760 if (c->event == XFRM_MSG_DELSA) {
2761 struct nlattr *attr;
2762
2763 id = nlmsg_data(nlh);
2764 memset(id, 0, sizeof(*id));
2765 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2766 id->spi = x->id.spi;
2767 id->family = x->props.family;
2768 id->proto = x->id.proto;
2769
2770 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2771 err = -EMSGSIZE;
2772 if (attr == NULL)
2773 goto out_free_skb;
2774
2775 p = nla_data(attr);
2776 }
2777 err = copy_to_user_state_extra(x, p, skb);
2778 if (err)
2779 goto out_free_skb;
2780
2781 nlmsg_end(skb, nlh);
2782
2783 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2784
2785 out_free_skb:
2786 kfree_skb(skb);
2787 return err;
2788 }
2789
2790 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2791 {
2792
2793 switch (c->event) {
2794 case XFRM_MSG_EXPIRE:
2795 return xfrm_exp_state_notify(x, c);
2796 case XFRM_MSG_NEWAE:
2797 return xfrm_aevent_state_notify(x, c);
2798 case XFRM_MSG_DELSA:
2799 case XFRM_MSG_UPDSA:
2800 case XFRM_MSG_NEWSA:
2801 return xfrm_notify_sa(x, c);
2802 case XFRM_MSG_FLUSHSA:
2803 return xfrm_notify_sa_flush(c);
2804 default:
2805 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2806 c->event);
2807 break;
2808 }
2809
2810 return 0;
2811
2812 }
2813
2814 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2815 struct xfrm_policy *xp)
2816 {
2817 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2818 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2819 + nla_total_size(sizeof(struct xfrm_mark))
2820 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2821 + userpolicy_type_attrsize();
2822 }
2823
2824 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2825 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2826 {
2827 __u32 seq = xfrm_get_acqseq();
2828 struct xfrm_user_acquire *ua;
2829 struct nlmsghdr *nlh;
2830 int err;
2831
2832 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2833 if (nlh == NULL)
2834 return -EMSGSIZE;
2835
2836 ua = nlmsg_data(nlh);
2837 memcpy(&ua->id, &x->id, sizeof(ua->id));
2838 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2839 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2840 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2841 ua->aalgos = xt->aalgos;
2842 ua->ealgos = xt->ealgos;
2843 ua->calgos = xt->calgos;
2844 ua->seq = x->km.seq = seq;
2845
2846 err = copy_to_user_tmpl(xp, skb);
2847 if (!err)
2848 err = copy_to_user_state_sec_ctx(x, skb);
2849 if (!err)
2850 err = copy_to_user_policy_type(xp->type, skb);
2851 if (!err)
2852 err = xfrm_mark_put(skb, &xp->mark);
2853 if (err) {
2854 nlmsg_cancel(skb, nlh);
2855 return err;
2856 }
2857
2858 nlmsg_end(skb, nlh);
2859 return 0;
2860 }
2861
2862 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2863 struct xfrm_policy *xp)
2864 {
2865 struct net *net = xs_net(x);
2866 struct sk_buff *skb;
2867 int err;
2868
2869 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2870 if (skb == NULL)
2871 return -ENOMEM;
2872
2873 err = build_acquire(skb, x, xt, xp);
2874 BUG_ON(err < 0);
2875
2876 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2877 }
2878
2879 /* User gives us xfrm_user_policy_info followed by an array of 0
2880 * or more templates.
2881 */
2882 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2883 u8 *data, int len, int *dir)
2884 {
2885 struct net *net = sock_net(sk);
2886 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2887 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2888 struct xfrm_policy *xp;
2889 int nr;
2890
2891 switch (sk->sk_family) {
2892 case AF_INET:
2893 if (opt != IP_XFRM_POLICY) {
2894 *dir = -EOPNOTSUPP;
2895 return NULL;
2896 }
2897 break;
2898 #if IS_ENABLED(CONFIG_IPV6)
2899 case AF_INET6:
2900 if (opt != IPV6_XFRM_POLICY) {
2901 *dir = -EOPNOTSUPP;
2902 return NULL;
2903 }
2904 break;
2905 #endif
2906 default:
2907 *dir = -EINVAL;
2908 return NULL;
2909 }
2910
2911 *dir = -EINVAL;
2912
2913 if (len < sizeof(*p) ||
2914 verify_newpolicy_info(p))
2915 return NULL;
2916
2917 nr = ((len - sizeof(*p)) / sizeof(*ut));
2918 if (validate_tmpl(nr, ut, p->sel.family))
2919 return NULL;
2920
2921 if (p->dir > XFRM_POLICY_OUT)
2922 return NULL;
2923
2924 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2925 if (xp == NULL) {
2926 *dir = -ENOBUFS;
2927 return NULL;
2928 }
2929
2930 copy_from_user_policy(xp, p);
2931 xp->type = XFRM_POLICY_TYPE_MAIN;
2932 copy_templates(xp, ut, nr);
2933
2934 *dir = p->dir;
2935
2936 return xp;
2937 }
2938
2939 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2940 {
2941 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2942 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2943 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2944 + nla_total_size(sizeof(struct xfrm_mark))
2945 + userpolicy_type_attrsize();
2946 }
2947
2948 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2949 int dir, const struct km_event *c)
2950 {
2951 struct xfrm_user_polexpire *upe;
2952 int hard = c->data.hard;
2953 struct nlmsghdr *nlh;
2954 int err;
2955
2956 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2957 if (nlh == NULL)
2958 return -EMSGSIZE;
2959
2960 upe = nlmsg_data(nlh);
2961 copy_to_user_policy(xp, &upe->pol, dir);
2962 err = copy_to_user_tmpl(xp, skb);
2963 if (!err)
2964 err = copy_to_user_sec_ctx(xp, skb);
2965 if (!err)
2966 err = copy_to_user_policy_type(xp->type, skb);
2967 if (!err)
2968 err = xfrm_mark_put(skb, &xp->mark);
2969 if (err) {
2970 nlmsg_cancel(skb, nlh);
2971 return err;
2972 }
2973 upe->hard = !!hard;
2974
2975 nlmsg_end(skb, nlh);
2976 return 0;
2977 }
2978
2979 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2980 {
2981 struct net *net = xp_net(xp);
2982 struct sk_buff *skb;
2983 int err;
2984
2985 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2986 if (skb == NULL)
2987 return -ENOMEM;
2988
2989 err = build_polexpire(skb, xp, dir, c);
2990 BUG_ON(err < 0);
2991
2992 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2993 }
2994
2995 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2996 {
2997 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2998 struct net *net = xp_net(xp);
2999 struct xfrm_userpolicy_info *p;
3000 struct xfrm_userpolicy_id *id;
3001 struct nlmsghdr *nlh;
3002 struct sk_buff *skb;
3003 unsigned int headlen;
3004 int err;
3005
3006 headlen = sizeof(*p);
3007 if (c->event == XFRM_MSG_DELPOLICY) {
3008 len += nla_total_size(headlen);
3009 headlen = sizeof(*id);
3010 }
3011 len += userpolicy_type_attrsize();
3012 len += nla_total_size(sizeof(struct xfrm_mark));
3013 len += NLMSG_ALIGN(headlen);
3014
3015 skb = nlmsg_new(len, GFP_ATOMIC);
3016 if (skb == NULL)
3017 return -ENOMEM;
3018
3019 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3020 err = -EMSGSIZE;
3021 if (nlh == NULL)
3022 goto out_free_skb;
3023
3024 p = nlmsg_data(nlh);
3025 if (c->event == XFRM_MSG_DELPOLICY) {
3026 struct nlattr *attr;
3027
3028 id = nlmsg_data(nlh);
3029 memset(id, 0, sizeof(*id));
3030 id->dir = dir;
3031 if (c->data.byid)
3032 id->index = xp->index;
3033 else
3034 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3035
3036 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3037 err = -EMSGSIZE;
3038 if (attr == NULL)
3039 goto out_free_skb;
3040
3041 p = nla_data(attr);
3042 }
3043
3044 copy_to_user_policy(xp, p, dir);
3045 err = copy_to_user_tmpl(xp, skb);
3046 if (!err)
3047 err = copy_to_user_policy_type(xp->type, skb);
3048 if (!err)
3049 err = xfrm_mark_put(skb, &xp->mark);
3050 if (err)
3051 goto out_free_skb;
3052
3053 nlmsg_end(skb, nlh);
3054
3055 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3056
3057 out_free_skb:
3058 kfree_skb(skb);
3059 return err;
3060 }
3061
3062 static int xfrm_notify_policy_flush(const struct km_event *c)
3063 {
3064 struct net *net = c->net;
3065 struct nlmsghdr *nlh;
3066 struct sk_buff *skb;
3067 int err;
3068
3069 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3070 if (skb == NULL)
3071 return -ENOMEM;
3072
3073 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3074 err = -EMSGSIZE;
3075 if (nlh == NULL)
3076 goto out_free_skb;
3077 err = copy_to_user_policy_type(c->data.type, skb);
3078 if (err)
3079 goto out_free_skb;
3080
3081 nlmsg_end(skb, nlh);
3082
3083 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3084
3085 out_free_skb:
3086 kfree_skb(skb);
3087 return err;
3088 }
3089
3090 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3091 {
3092
3093 switch (c->event) {
3094 case XFRM_MSG_NEWPOLICY:
3095 case XFRM_MSG_UPDPOLICY:
3096 case XFRM_MSG_DELPOLICY:
3097 return xfrm_notify_policy(xp, dir, c);
3098 case XFRM_MSG_FLUSHPOLICY:
3099 return xfrm_notify_policy_flush(c);
3100 case XFRM_MSG_POLEXPIRE:
3101 return xfrm_exp_policy_notify(xp, dir, c);
3102 default:
3103 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3104 c->event);
3105 }
3106
3107 return 0;
3108
3109 }
3110
3111 static inline unsigned int xfrm_report_msgsize(void)
3112 {
3113 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3114 }
3115
3116 static int build_report(struct sk_buff *skb, u8 proto,
3117 struct xfrm_selector *sel, xfrm_address_t *addr)
3118 {
3119 struct xfrm_user_report *ur;
3120 struct nlmsghdr *nlh;
3121
3122 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3123 if (nlh == NULL)
3124 return -EMSGSIZE;
3125
3126 ur = nlmsg_data(nlh);
3127 ur->proto = proto;
3128 memcpy(&ur->sel, sel, sizeof(ur->sel));
3129
3130 if (addr) {
3131 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3132 if (err) {
3133 nlmsg_cancel(skb, nlh);
3134 return err;
3135 }
3136 }
3137 nlmsg_end(skb, nlh);
3138 return 0;
3139 }
3140
3141 static int xfrm_send_report(struct net *net, u8 proto,
3142 struct xfrm_selector *sel, xfrm_address_t *addr)
3143 {
3144 struct sk_buff *skb;
3145 int err;
3146
3147 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3148 if (skb == NULL)
3149 return -ENOMEM;
3150
3151 err = build_report(skb, proto, sel, addr);
3152 BUG_ON(err < 0);
3153
3154 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3155 }
3156
3157 static inline unsigned int xfrm_mapping_msgsize(void)
3158 {
3159 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3160 }
3161
3162 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3163 xfrm_address_t *new_saddr, __be16 new_sport)
3164 {
3165 struct xfrm_user_mapping *um;
3166 struct nlmsghdr *nlh;
3167
3168 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3169 if (nlh == NULL)
3170 return -EMSGSIZE;
3171
3172 um = nlmsg_data(nlh);
3173
3174 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3175 um->id.spi = x->id.spi;
3176 um->id.family = x->props.family;
3177 um->id.proto = x->id.proto;
3178 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3179 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3180 um->new_sport = new_sport;
3181 um->old_sport = x->encap->encap_sport;
3182 um->reqid = x->props.reqid;
3183
3184 nlmsg_end(skb, nlh);
3185 return 0;
3186 }
3187
3188 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3189 __be16 sport)
3190 {
3191 struct net *net = xs_net(x);
3192 struct sk_buff *skb;
3193 int err;
3194
3195 if (x->id.proto != IPPROTO_ESP)
3196 return -EINVAL;
3197
3198 if (!x->encap)
3199 return -EINVAL;
3200
3201 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3202 if (skb == NULL)
3203 return -ENOMEM;
3204
3205 err = build_mapping(skb, x, ipaddr, sport);
3206 BUG_ON(err < 0);
3207
3208 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3209 }
3210
3211 static bool xfrm_is_alive(const struct km_event *c)
3212 {
3213 return (bool)xfrm_acquire_is_on(c->net);
3214 }
3215
3216 static struct xfrm_mgr netlink_mgr = {
3217 .notify = xfrm_send_state_notify,
3218 .acquire = xfrm_send_acquire,
3219 .compile_policy = xfrm_compile_policy,
3220 .notify_policy = xfrm_send_policy_notify,
3221 .report = xfrm_send_report,
3222 .migrate = xfrm_send_migrate,
3223 .new_mapping = xfrm_send_mapping,
3224 .is_alive = xfrm_is_alive,
3225 };
3226
3227 static int __net_init xfrm_user_net_init(struct net *net)
3228 {
3229 struct sock *nlsk;
3230 struct netlink_kernel_cfg cfg = {
3231 .groups = XFRMNLGRP_MAX,
3232 .input = xfrm_netlink_rcv,
3233 };
3234
3235 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3236 if (nlsk == NULL)
3237 return -ENOMEM;
3238 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3239 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3240 return 0;
3241 }
3242
3243 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3244 {
3245 struct net *net;
3246 list_for_each_entry(net, net_exit_list, exit_list)
3247 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3248 synchronize_net();
3249 list_for_each_entry(net, net_exit_list, exit_list)
3250 netlink_kernel_release(net->xfrm.nlsk_stash);
3251 }
3252
3253 static struct pernet_operations xfrm_user_net_ops = {
3254 .init = xfrm_user_net_init,
3255 .exit_batch = xfrm_user_net_exit,
3256 };
3257
3258 static int __init xfrm_user_init(void)
3259 {
3260 int rv;
3261
3262 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3263
3264 rv = register_pernet_subsys(&xfrm_user_net_ops);
3265 if (rv < 0)
3266 return rv;
3267 rv = xfrm_register_km(&netlink_mgr);
3268 if (rv < 0)
3269 unregister_pernet_subsys(&xfrm_user_net_ops);
3270 return rv;
3271 }
3272
3273 static void __exit xfrm_user_exit(void)
3274 {
3275 xfrm_unregister_km(&netlink_mgr);
3276 unregister_pernet_subsys(&xfrm_user_net_ops);
3277 }
3278
3279 module_init(xfrm_user_init);
3280 module_exit(xfrm_user_exit);
3281 MODULE_LICENSE("GPL");
3282 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3283
Linux with added FPC-III support