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