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