]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/xfrm/xfrm_user.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:


33878e6e0d0a01cdc5da8ab20bdb92d0d93e056d
[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 (!rt)
125 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
126
127 rs = nla_data(rt);
128
129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 return -EINVAL;
131
132 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
133 nla_len(rt) != sizeof(*rs))
134 return -EINVAL;
135
136 /* As only ESP and AH support ESN feature. */
137 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
138 return -EINVAL;
139
140 if (p->replay_window != 0)
141 return -EINVAL;
142
143 return 0;
144 }
145
146 static int verify_newsa_info(struct xfrm_usersa_info *p,
147 struct nlattr **attrs)
148 {
149 int err;
150
151 err = -EINVAL;
152 switch (p->family) {
153 case AF_INET:
154 break;
155
156 case AF_INET6:
157 #if IS_ENABLED(CONFIG_IPV6)
158 break;
159 #else
160 err = -EAFNOSUPPORT;
161 goto out;
162 #endif
163
164 default:
165 goto out;
166 }
167
168 err = -EINVAL;
169 switch (p->id.proto) {
170 case IPPROTO_AH:
171 if ((!attrs[XFRMA_ALG_AUTH] &&
172 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
173 attrs[XFRMA_ALG_AEAD] ||
174 attrs[XFRMA_ALG_CRYPT] ||
175 attrs[XFRMA_ALG_COMP] ||
176 attrs[XFRMA_TFCPAD])
177 goto out;
178 break;
179
180 case IPPROTO_ESP:
181 if (attrs[XFRMA_ALG_COMP])
182 goto out;
183 if (!attrs[XFRMA_ALG_AUTH] &&
184 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
185 !attrs[XFRMA_ALG_CRYPT] &&
186 !attrs[XFRMA_ALG_AEAD])
187 goto out;
188 if ((attrs[XFRMA_ALG_AUTH] ||
189 attrs[XFRMA_ALG_AUTH_TRUNC] ||
190 attrs[XFRMA_ALG_CRYPT]) &&
191 attrs[XFRMA_ALG_AEAD])
192 goto out;
193 if (attrs[XFRMA_TFCPAD] &&
194 p->mode != XFRM_MODE_TUNNEL)
195 goto out;
196 break;
197
198 case IPPROTO_COMP:
199 if (!attrs[XFRMA_ALG_COMP] ||
200 attrs[XFRMA_ALG_AEAD] ||
201 attrs[XFRMA_ALG_AUTH] ||
202 attrs[XFRMA_ALG_AUTH_TRUNC] ||
203 attrs[XFRMA_ALG_CRYPT] ||
204 attrs[XFRMA_TFCPAD] ||
205 (ntohl(p->id.spi) >= 0x10000))
206 goto out;
207 break;
208
209 #if IS_ENABLED(CONFIG_IPV6)
210 case IPPROTO_DSTOPTS:
211 case IPPROTO_ROUTING:
212 if (attrs[XFRMA_ALG_COMP] ||
213 attrs[XFRMA_ALG_AUTH] ||
214 attrs[XFRMA_ALG_AUTH_TRUNC] ||
215 attrs[XFRMA_ALG_AEAD] ||
216 attrs[XFRMA_ALG_CRYPT] ||
217 attrs[XFRMA_ENCAP] ||
218 attrs[XFRMA_SEC_CTX] ||
219 attrs[XFRMA_TFCPAD] ||
220 !attrs[XFRMA_COADDR])
221 goto out;
222 break;
223 #endif
224
225 default:
226 goto out;
227 }
228
229 if ((err = verify_aead(attrs)))
230 goto out;
231 if ((err = verify_auth_trunc(attrs)))
232 goto out;
233 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
234 goto out;
235 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
236 goto out;
237 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
238 goto out;
239 if ((err = verify_sec_ctx_len(attrs)))
240 goto out;
241 if ((err = verify_replay(p, attrs)))
242 goto out;
243
244 err = -EINVAL;
245 switch (p->mode) {
246 case XFRM_MODE_TRANSPORT:
247 case XFRM_MODE_TUNNEL:
248 case XFRM_MODE_ROUTEOPTIMIZATION:
249 case XFRM_MODE_BEET:
250 break;
251
252 default:
253 goto out;
254 }
255
256 err = 0;
257
258 out:
259 return err;
260 }
261
262 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
263 struct xfrm_algo_desc *(*get_byname)(const char *, int),
264 struct nlattr *rta)
265 {
266 struct xfrm_algo *p, *ualg;
267 struct xfrm_algo_desc *algo;
268
269 if (!rta)
270 return 0;
271
272 ualg = nla_data(rta);
273
274 algo = get_byname(ualg->alg_name, 1);
275 if (!algo)
276 return -ENOSYS;
277 *props = algo->desc.sadb_alg_id;
278
279 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
280 if (!p)
281 return -ENOMEM;
282
283 strcpy(p->alg_name, algo->name);
284 *algpp = p;
285 return 0;
286 }
287
288 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
289 {
290 struct xfrm_algo *p, *ualg;
291 struct xfrm_algo_desc *algo;
292
293 if (!rta)
294 return 0;
295
296 ualg = nla_data(rta);
297
298 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
299 if (!algo)
300 return -ENOSYS;
301 x->props.ealgo = algo->desc.sadb_alg_id;
302
303 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
304 if (!p)
305 return -ENOMEM;
306
307 strcpy(p->alg_name, algo->name);
308 x->ealg = p;
309 x->geniv = algo->uinfo.encr.geniv;
310 return 0;
311 }
312
313 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315 {
316 struct xfrm_algo *ualg;
317 struct xfrm_algo_auth *p;
318 struct xfrm_algo_desc *algo;
319
320 if (!rta)
321 return 0;
322
323 ualg = nla_data(rta);
324
325 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
326 if (!algo)
327 return -ENOSYS;
328 *props = algo->desc.sadb_alg_id;
329
330 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
331 if (!p)
332 return -ENOMEM;
333
334 strcpy(p->alg_name, algo->name);
335 p->alg_key_len = ualg->alg_key_len;
336 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
337 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
338
339 *algpp = p;
340 return 0;
341 }
342
343 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
344 struct nlattr *rta)
345 {
346 struct xfrm_algo_auth *p, *ualg;
347 struct xfrm_algo_desc *algo;
348
349 if (!rta)
350 return 0;
351
352 ualg = nla_data(rta);
353
354 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
355 if (!algo)
356 return -ENOSYS;
357 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
358 return -EINVAL;
359 *props = algo->desc.sadb_alg_id;
360
361 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
362 if (!p)
363 return -ENOMEM;
364
365 strcpy(p->alg_name, algo->name);
366 if (!p->alg_trunc_len)
367 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
368
369 *algpp = p;
370 return 0;
371 }
372
373 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
374 {
375 struct xfrm_algo_aead *p, *ualg;
376 struct xfrm_algo_desc *algo;
377
378 if (!rta)
379 return 0;
380
381 ualg = nla_data(rta);
382
383 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
384 if (!algo)
385 return -ENOSYS;
386 x->props.ealgo = algo->desc.sadb_alg_id;
387
388 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
389 if (!p)
390 return -ENOMEM;
391
392 strcpy(p->alg_name, algo->name);
393 x->aead = p;
394 x->geniv = algo->uinfo.aead.geniv;
395 return 0;
396 }
397
398 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
399 struct nlattr *rp)
400 {
401 struct xfrm_replay_state_esn *up;
402 unsigned int ulen;
403
404 if (!replay_esn || !rp)
405 return 0;
406
407 up = nla_data(rp);
408 ulen = xfrm_replay_state_esn_len(up);
409
410 /* Check the overall length and the internal bitmap length to avoid
411 * potential overflow. */
412 if (nla_len(rp) < (int)ulen ||
413 xfrm_replay_state_esn_len(replay_esn) != ulen ||
414 replay_esn->bmp_len != up->bmp_len)
415 return -EINVAL;
416
417 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
418 return -EINVAL;
419
420 return 0;
421 }
422
423 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
424 struct xfrm_replay_state_esn **preplay_esn,
425 struct nlattr *rta)
426 {
427 struct xfrm_replay_state_esn *p, *pp, *up;
428 unsigned int klen, ulen;
429
430 if (!rta)
431 return 0;
432
433 up = nla_data(rta);
434 klen = xfrm_replay_state_esn_len(up);
435 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
436
437 p = kzalloc(klen, GFP_KERNEL);
438 if (!p)
439 return -ENOMEM;
440
441 pp = kzalloc(klen, GFP_KERNEL);
442 if (!pp) {
443 kfree(p);
444 return -ENOMEM;
445 }
446
447 memcpy(p, up, ulen);
448 memcpy(pp, up, ulen);
449
450 *replay_esn = p;
451 *preplay_esn = pp;
452
453 return 0;
454 }
455
456 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
457 {
458 unsigned int len = 0;
459
460 if (xfrm_ctx) {
461 len += sizeof(struct xfrm_user_sec_ctx);
462 len += xfrm_ctx->ctx_len;
463 }
464 return len;
465 }
466
467 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
468 {
469 memcpy(&x->id, &p->id, sizeof(x->id));
470 memcpy(&x->sel, &p->sel, sizeof(x->sel));
471 memcpy(&x->lft, &p->lft, sizeof(x->lft));
472 x->props.mode = p->mode;
473 x->props.replay_window = min_t(unsigned int, p->replay_window,
474 sizeof(x->replay.bitmap) * 8);
475 x->props.reqid = p->reqid;
476 x->props.family = p->family;
477 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
478 x->props.flags = p->flags;
479
480 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
481 x->sel.family = p->family;
482 }
483
484 /*
485 * someday when pfkey also has support, we could have the code
486 * somehow made shareable and move it to xfrm_state.c - JHS
487 *
488 */
489 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
490 int update_esn)
491 {
492 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
493 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
494 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
495 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
496 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
497
498 if (re) {
499 struct xfrm_replay_state_esn *replay_esn;
500 replay_esn = nla_data(re);
501 memcpy(x->replay_esn, replay_esn,
502 xfrm_replay_state_esn_len(replay_esn));
503 memcpy(x->preplay_esn, replay_esn,
504 xfrm_replay_state_esn_len(replay_esn));
505 }
506
507 if (rp) {
508 struct xfrm_replay_state *replay;
509 replay = nla_data(rp);
510 memcpy(&x->replay, replay, sizeof(*replay));
511 memcpy(&x->preplay, replay, sizeof(*replay));
512 }
513
514 if (lt) {
515 struct xfrm_lifetime_cur *ltime;
516 ltime = nla_data(lt);
517 x->curlft.bytes = ltime->bytes;
518 x->curlft.packets = ltime->packets;
519 x->curlft.add_time = ltime->add_time;
520 x->curlft.use_time = ltime->use_time;
521 }
522
523 if (et)
524 x->replay_maxage = nla_get_u32(et);
525
526 if (rt)
527 x->replay_maxdiff = nla_get_u32(rt);
528 }
529
530 static struct xfrm_state *xfrm_state_construct(struct net *net,
531 struct xfrm_usersa_info *p,
532 struct nlattr **attrs,
533 int *errp)
534 {
535 struct xfrm_state *x = xfrm_state_alloc(net);
536 int err = -ENOMEM;
537
538 if (!x)
539 goto error_no_put;
540
541 copy_from_user_state(x, p);
542
543 if (attrs[XFRMA_SA_EXTRA_FLAGS])
544 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
545
546 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
547 goto error;
548 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
549 attrs[XFRMA_ALG_AUTH_TRUNC])))
550 goto error;
551 if (!x->props.aalgo) {
552 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
553 attrs[XFRMA_ALG_AUTH])))
554 goto error;
555 }
556 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
557 goto error;
558 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
559 xfrm_calg_get_byname,
560 attrs[XFRMA_ALG_COMP])))
561 goto error;
562
563 if (attrs[XFRMA_ENCAP]) {
564 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
565 sizeof(*x->encap), GFP_KERNEL);
566 if (x->encap == NULL)
567 goto error;
568 }
569
570 if (attrs[XFRMA_TFCPAD])
571 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
572
573 if (attrs[XFRMA_COADDR]) {
574 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
575 sizeof(*x->coaddr), GFP_KERNEL);
576 if (x->coaddr == NULL)
577 goto error;
578 }
579
580 xfrm_mark_get(attrs, &x->mark);
581
582 if (attrs[XFRMA_OUTPUT_MARK])
583 x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]);
584
585 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
586 if (err)
587 goto error;
588
589 if (attrs[XFRMA_SEC_CTX]) {
590 err = security_xfrm_state_alloc(x,
591 nla_data(attrs[XFRMA_SEC_CTX]));
592 if (err)
593 goto error;
594 }
595
596 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
597 attrs[XFRMA_REPLAY_ESN_VAL])))
598 goto error;
599
600 x->km.seq = p->seq;
601 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
602 /* sysctl_xfrm_aevent_etime is in 100ms units */
603 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
604
605 if ((err = xfrm_init_replay(x)))
606 goto error;
607
608 /* override default values from above */
609 xfrm_update_ae_params(x, attrs, 0);
610
611 /* configure the hardware if offload is requested */
612 if (attrs[XFRMA_OFFLOAD_DEV]) {
613 err = xfrm_dev_state_add(net, x,
614 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
615 if (err)
616 goto error;
617 }
618
619 return x;
620
621 error:
622 x->km.state = XFRM_STATE_DEAD;
623 xfrm_state_put(x);
624 error_no_put:
625 *errp = err;
626 return NULL;
627 }
628
629 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
630 struct nlattr **attrs)
631 {
632 struct net *net = sock_net(skb->sk);
633 struct xfrm_usersa_info *p = nlmsg_data(nlh);
634 struct xfrm_state *x;
635 int err;
636 struct km_event c;
637
638 err = verify_newsa_info(p, attrs);
639 if (err)
640 return err;
641
642 x = xfrm_state_construct(net, p, attrs, &err);
643 if (!x)
644 return err;
645
646 xfrm_state_hold(x);
647 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
648 err = xfrm_state_add(x);
649 else
650 err = xfrm_state_update(x);
651
652 xfrm_audit_state_add(x, err ? 0 : 1, true);
653
654 if (err < 0) {
655 x->km.state = XFRM_STATE_DEAD;
656 xfrm_dev_state_delete(x);
657 __xfrm_state_put(x);
658 goto out;
659 }
660
661 if (x->km.state == XFRM_STATE_VOID)
662 x->km.state = XFRM_STATE_VALID;
663
664 c.seq = nlh->nlmsg_seq;
665 c.portid = nlh->nlmsg_pid;
666 c.event = nlh->nlmsg_type;
667
668 km_state_notify(x, &c);
669 out:
670 xfrm_state_put(x);
671 return err;
672 }
673
674 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
675 struct xfrm_usersa_id *p,
676 struct nlattr **attrs,
677 int *errp)
678 {
679 struct xfrm_state *x = NULL;
680 struct xfrm_mark m;
681 int err;
682 u32 mark = xfrm_mark_get(attrs, &m);
683
684 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
685 err = -ESRCH;
686 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
687 } else {
688 xfrm_address_t *saddr = NULL;
689
690 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
691 if (!saddr) {
692 err = -EINVAL;
693 goto out;
694 }
695
696 err = -ESRCH;
697 x = xfrm_state_lookup_byaddr(net, mark,
698 &p->daddr, saddr,
699 p->proto, p->family);
700 }
701
702 out:
703 if (!x && errp)
704 *errp = err;
705 return x;
706 }
707
708 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
709 struct nlattr **attrs)
710 {
711 struct net *net = sock_net(skb->sk);
712 struct xfrm_state *x;
713 int err = -ESRCH;
714 struct km_event c;
715 struct xfrm_usersa_id *p = nlmsg_data(nlh);
716
717 x = xfrm_user_state_lookup(net, p, attrs, &err);
718 if (x == NULL)
719 return err;
720
721 if ((err = security_xfrm_state_delete(x)) != 0)
722 goto out;
723
724 if (xfrm_state_kern(x)) {
725 err = -EPERM;
726 goto out;
727 }
728
729 err = xfrm_state_delete(x);
730
731 if (err < 0)
732 goto out;
733
734 c.seq = nlh->nlmsg_seq;
735 c.portid = nlh->nlmsg_pid;
736 c.event = nlh->nlmsg_type;
737 km_state_notify(x, &c);
738
739 out:
740 xfrm_audit_state_delete(x, err ? 0 : 1, true);
741 xfrm_state_put(x);
742 return err;
743 }
744
745 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
746 {
747 memset(p, 0, sizeof(*p));
748 memcpy(&p->id, &x->id, sizeof(p->id));
749 memcpy(&p->sel, &x->sel, sizeof(p->sel));
750 memcpy(&p->lft, &x->lft, sizeof(p->lft));
751 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
752 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
753 put_unaligned(x->stats.replay, &p->stats.replay);
754 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
755 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
756 p->mode = x->props.mode;
757 p->replay_window = x->props.replay_window;
758 p->reqid = x->props.reqid;
759 p->family = x->props.family;
760 p->flags = x->props.flags;
761 p->seq = x->km.seq;
762 }
763
764 struct xfrm_dump_info {
765 struct sk_buff *in_skb;
766 struct sk_buff *out_skb;
767 u32 nlmsg_seq;
768 u16 nlmsg_flags;
769 };
770
771 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
772 {
773 struct xfrm_user_sec_ctx *uctx;
774 struct nlattr *attr;
775 int ctx_size = sizeof(*uctx) + s->ctx_len;
776
777 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
778 if (attr == NULL)
779 return -EMSGSIZE;
780
781 uctx = nla_data(attr);
782 uctx->exttype = XFRMA_SEC_CTX;
783 uctx->len = ctx_size;
784 uctx->ctx_doi = s->ctx_doi;
785 uctx->ctx_alg = s->ctx_alg;
786 uctx->ctx_len = s->ctx_len;
787 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
788
789 return 0;
790 }
791
792 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
793 {
794 struct xfrm_user_offload *xuo;
795 struct nlattr *attr;
796
797 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
798 if (attr == NULL)
799 return -EMSGSIZE;
800
801 xuo = nla_data(attr);
802 memset(xuo, 0, sizeof(*xuo));
803 xuo->ifindex = xso->dev->ifindex;
804 xuo->flags = xso->flags;
805
806 return 0;
807 }
808
809 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
810 {
811 struct xfrm_algo *algo;
812 struct nlattr *nla;
813
814 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
815 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
816 if (!nla)
817 return -EMSGSIZE;
818
819 algo = nla_data(nla);
820 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
821 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
822 algo->alg_key_len = auth->alg_key_len;
823
824 return 0;
825 }
826
827 /* Don't change this without updating xfrm_sa_len! */
828 static int copy_to_user_state_extra(struct xfrm_state *x,
829 struct xfrm_usersa_info *p,
830 struct sk_buff *skb)
831 {
832 int ret = 0;
833
834 copy_to_user_state(x, p);
835
836 if (x->props.extra_flags) {
837 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
838 x->props.extra_flags);
839 if (ret)
840 goto out;
841 }
842
843 if (x->coaddr) {
844 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
845 if (ret)
846 goto out;
847 }
848 if (x->lastused) {
849 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
850 XFRMA_PAD);
851 if (ret)
852 goto out;
853 }
854 if (x->aead) {
855 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
856 if (ret)
857 goto out;
858 }
859 if (x->aalg) {
860 ret = copy_to_user_auth(x->aalg, skb);
861 if (!ret)
862 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
863 xfrm_alg_auth_len(x->aalg), x->aalg);
864 if (ret)
865 goto out;
866 }
867 if (x->ealg) {
868 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
869 if (ret)
870 goto out;
871 }
872 if (x->calg) {
873 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
874 if (ret)
875 goto out;
876 }
877 if (x->encap) {
878 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
879 if (ret)
880 goto out;
881 }
882 if (x->tfcpad) {
883 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
884 if (ret)
885 goto out;
886 }
887 ret = xfrm_mark_put(skb, &x->mark);
888 if (ret)
889 goto out;
890 if (x->replay_esn)
891 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
892 xfrm_replay_state_esn_len(x->replay_esn),
893 x->replay_esn);
894 else
895 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
896 &x->replay);
897 if (ret)
898 goto out;
899 if(x->xso.dev)
900 ret = copy_user_offload(&x->xso, skb);
901 if (ret)
902 goto out;
903 if (x->props.output_mark) {
904 ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
905 if (ret)
906 goto out;
907 }
908 if (x->security)
909 ret = copy_sec_ctx(x->security, skb);
910 out:
911 return ret;
912 }
913
914 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
915 {
916 struct xfrm_dump_info *sp = ptr;
917 struct sk_buff *in_skb = sp->in_skb;
918 struct sk_buff *skb = sp->out_skb;
919 struct xfrm_usersa_info *p;
920 struct nlmsghdr *nlh;
921 int err;
922
923 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
924 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
925 if (nlh == NULL)
926 return -EMSGSIZE;
927
928 p = nlmsg_data(nlh);
929
930 err = copy_to_user_state_extra(x, p, skb);
931 if (err) {
932 nlmsg_cancel(skb, nlh);
933 return err;
934 }
935 nlmsg_end(skb, nlh);
936 return 0;
937 }
938
939 static int xfrm_dump_sa_done(struct netlink_callback *cb)
940 {
941 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
942 struct sock *sk = cb->skb->sk;
943 struct net *net = sock_net(sk);
944
945 if (cb->args[0])
946 xfrm_state_walk_done(walk, net);
947 return 0;
948 }
949
950 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
951 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
952 {
953 struct net *net = sock_net(skb->sk);
954 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
955 struct xfrm_dump_info info;
956
957 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
958 sizeof(cb->args) - sizeof(cb->args[0]));
959
960 info.in_skb = cb->skb;
961 info.out_skb = skb;
962 info.nlmsg_seq = cb->nlh->nlmsg_seq;
963 info.nlmsg_flags = NLM_F_MULTI;
964
965 if (!cb->args[0]) {
966 struct nlattr *attrs[XFRMA_MAX+1];
967 struct xfrm_address_filter *filter = NULL;
968 u8 proto = 0;
969 int err;
970
971 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
972 NULL);
973 if (err < 0)
974 return err;
975
976 if (attrs[XFRMA_ADDRESS_FILTER]) {
977 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
978 sizeof(*filter), GFP_KERNEL);
979 if (filter == NULL)
980 return -ENOMEM;
981 }
982
983 if (attrs[XFRMA_PROTO])
984 proto = nla_get_u8(attrs[XFRMA_PROTO]);
985
986 xfrm_state_walk_init(walk, proto, filter);
987 cb->args[0] = 1;
988 }
989
990 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
991
992 return skb->len;
993 }
994
995 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
996 struct xfrm_state *x, u32 seq)
997 {
998 struct xfrm_dump_info info;
999 struct sk_buff *skb;
1000 int err;
1001
1002 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1003 if (!skb)
1004 return ERR_PTR(-ENOMEM);
1005
1006 info.in_skb = in_skb;
1007 info.out_skb = skb;
1008 info.nlmsg_seq = seq;
1009 info.nlmsg_flags = 0;
1010
1011 err = dump_one_state(x, 0, &info);
1012 if (err) {
1013 kfree_skb(skb);
1014 return ERR_PTR(err);
1015 }
1016
1017 return skb;
1018 }
1019
1020 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1021 * Must be called with RCU read lock.
1022 */
1023 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1024 u32 pid, unsigned int group)
1025 {
1026 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1027
1028 if (!nlsk) {
1029 kfree_skb(skb);
1030 return -EPIPE;
1031 }
1032
1033 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1034 }
1035
1036 static inline unsigned int xfrm_spdinfo_msgsize(void)
1037 {
1038 return NLMSG_ALIGN(4)
1039 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1040 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1041 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1042 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1043 }
1044
1045 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1046 u32 portid, u32 seq, u32 flags)
1047 {
1048 struct xfrmk_spdinfo si;
1049 struct xfrmu_spdinfo spc;
1050 struct xfrmu_spdhinfo sph;
1051 struct xfrmu_spdhthresh spt4, spt6;
1052 struct nlmsghdr *nlh;
1053 int err;
1054 u32 *f;
1055 unsigned lseq;
1056
1057 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1058 if (nlh == NULL) /* shouldn't really happen ... */
1059 return -EMSGSIZE;
1060
1061 f = nlmsg_data(nlh);
1062 *f = flags;
1063 xfrm_spd_getinfo(net, &si);
1064 spc.incnt = si.incnt;
1065 spc.outcnt = si.outcnt;
1066 spc.fwdcnt = si.fwdcnt;
1067 spc.inscnt = si.inscnt;
1068 spc.outscnt = si.outscnt;
1069 spc.fwdscnt = si.fwdscnt;
1070 sph.spdhcnt = si.spdhcnt;
1071 sph.spdhmcnt = si.spdhmcnt;
1072
1073 do {
1074 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1075
1076 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1077 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1078 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1079 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1080 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1081
1082 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1083 if (!err)
1084 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1085 if (!err)
1086 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1087 if (!err)
1088 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1089 if (err) {
1090 nlmsg_cancel(skb, nlh);
1091 return err;
1092 }
1093
1094 nlmsg_end(skb, nlh);
1095 return 0;
1096 }
1097
1098 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1099 struct nlattr **attrs)
1100 {
1101 struct net *net = sock_net(skb->sk);
1102 struct xfrmu_spdhthresh *thresh4 = NULL;
1103 struct xfrmu_spdhthresh *thresh6 = NULL;
1104
1105 /* selector prefixlen thresholds to hash policies */
1106 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1107 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1108
1109 if (nla_len(rta) < sizeof(*thresh4))
1110 return -EINVAL;
1111 thresh4 = nla_data(rta);
1112 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1113 return -EINVAL;
1114 }
1115 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1116 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1117
1118 if (nla_len(rta) < sizeof(*thresh6))
1119 return -EINVAL;
1120 thresh6 = nla_data(rta);
1121 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1122 return -EINVAL;
1123 }
1124
1125 if (thresh4 || thresh6) {
1126 write_seqlock(&net->xfrm.policy_hthresh.lock);
1127 if (thresh4) {
1128 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1129 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1130 }
1131 if (thresh6) {
1132 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1133 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1134 }
1135 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1136
1137 xfrm_policy_hash_rebuild(net);
1138 }
1139
1140 return 0;
1141 }
1142
1143 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1144 struct nlattr **attrs)
1145 {
1146 struct net *net = sock_net(skb->sk);
1147 struct sk_buff *r_skb;
1148 u32 *flags = nlmsg_data(nlh);
1149 u32 sportid = NETLINK_CB(skb).portid;
1150 u32 seq = nlh->nlmsg_seq;
1151 int err;
1152
1153 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1154 if (r_skb == NULL)
1155 return -ENOMEM;
1156
1157 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1158 BUG_ON(err < 0);
1159
1160 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1161 }
1162
1163 static inline unsigned int xfrm_sadinfo_msgsize(void)
1164 {
1165 return NLMSG_ALIGN(4)
1166 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1167 + nla_total_size(4); /* XFRMA_SAD_CNT */
1168 }
1169
1170 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1171 u32 portid, u32 seq, u32 flags)
1172 {
1173 struct xfrmk_sadinfo si;
1174 struct xfrmu_sadhinfo sh;
1175 struct nlmsghdr *nlh;
1176 int err;
1177 u32 *f;
1178
1179 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1180 if (nlh == NULL) /* shouldn't really happen ... */
1181 return -EMSGSIZE;
1182
1183 f = nlmsg_data(nlh);
1184 *f = flags;
1185 xfrm_sad_getinfo(net, &si);
1186
1187 sh.sadhmcnt = si.sadhmcnt;
1188 sh.sadhcnt = si.sadhcnt;
1189
1190 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1191 if (!err)
1192 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1193 if (err) {
1194 nlmsg_cancel(skb, nlh);
1195 return err;
1196 }
1197
1198 nlmsg_end(skb, nlh);
1199 return 0;
1200 }
1201
1202 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1203 struct nlattr **attrs)
1204 {
1205 struct net *net = sock_net(skb->sk);
1206 struct sk_buff *r_skb;
1207 u32 *flags = nlmsg_data(nlh);
1208 u32 sportid = NETLINK_CB(skb).portid;
1209 u32 seq = nlh->nlmsg_seq;
1210 int err;
1211
1212 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1213 if (r_skb == NULL)
1214 return -ENOMEM;
1215
1216 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1217 BUG_ON(err < 0);
1218
1219 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1220 }
1221
1222 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1223 struct nlattr **attrs)
1224 {
1225 struct net *net = sock_net(skb->sk);
1226 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1227 struct xfrm_state *x;
1228 struct sk_buff *resp_skb;
1229 int err = -ESRCH;
1230
1231 x = xfrm_user_state_lookup(net, p, attrs, &err);
1232 if (x == NULL)
1233 goto out_noput;
1234
1235 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1236 if (IS_ERR(resp_skb)) {
1237 err = PTR_ERR(resp_skb);
1238 } else {
1239 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1240 }
1241 xfrm_state_put(x);
1242 out_noput:
1243 return err;
1244 }
1245
1246 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1247 struct nlattr **attrs)
1248 {
1249 struct net *net = sock_net(skb->sk);
1250 struct xfrm_state *x;
1251 struct xfrm_userspi_info *p;
1252 struct sk_buff *resp_skb;
1253 xfrm_address_t *daddr;
1254 int family;
1255 int err;
1256 u32 mark;
1257 struct xfrm_mark m;
1258
1259 p = nlmsg_data(nlh);
1260 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1261 if (err)
1262 goto out_noput;
1263
1264 family = p->info.family;
1265 daddr = &p->info.id.daddr;
1266
1267 x = NULL;
1268
1269 mark = xfrm_mark_get(attrs, &m);
1270 if (p->info.seq) {
1271 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1272 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1273 xfrm_state_put(x);
1274 x = NULL;
1275 }
1276 }
1277
1278 if (!x)
1279 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1280 p->info.id.proto, daddr,
1281 &p->info.saddr, 1,
1282 family);
1283 err = -ENOENT;
1284 if (x == NULL)
1285 goto out_noput;
1286
1287 err = xfrm_alloc_spi(x, p->min, p->max);
1288 if (err)
1289 goto out;
1290
1291 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1292 if (IS_ERR(resp_skb)) {
1293 err = PTR_ERR(resp_skb);
1294 goto out;
1295 }
1296
1297 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1298
1299 out:
1300 xfrm_state_put(x);
1301 out_noput:
1302 return err;
1303 }
1304
1305 static int verify_policy_dir(u8 dir)
1306 {
1307 switch (dir) {
1308 case XFRM_POLICY_IN:
1309 case XFRM_POLICY_OUT:
1310 case XFRM_POLICY_FWD:
1311 break;
1312
1313 default:
1314 return -EINVAL;
1315 }
1316
1317 return 0;
1318 }
1319
1320 static int verify_policy_type(u8 type)
1321 {
1322 switch (type) {
1323 case XFRM_POLICY_TYPE_MAIN:
1324 #ifdef CONFIG_XFRM_SUB_POLICY
1325 case XFRM_POLICY_TYPE_SUB:
1326 #endif
1327 break;
1328
1329 default:
1330 return -EINVAL;
1331 }
1332
1333 return 0;
1334 }
1335
1336 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1337 {
1338 int ret;
1339
1340 switch (p->share) {
1341 case XFRM_SHARE_ANY:
1342 case XFRM_SHARE_SESSION:
1343 case XFRM_SHARE_USER:
1344 case XFRM_SHARE_UNIQUE:
1345 break;
1346
1347 default:
1348 return -EINVAL;
1349 }
1350
1351 switch (p->action) {
1352 case XFRM_POLICY_ALLOW:
1353 case XFRM_POLICY_BLOCK:
1354 break;
1355
1356 default:
1357 return -EINVAL;
1358 }
1359
1360 switch (p->sel.family) {
1361 case AF_INET:
1362 break;
1363
1364 case AF_INET6:
1365 #if IS_ENABLED(CONFIG_IPV6)
1366 break;
1367 #else
1368 return -EAFNOSUPPORT;
1369 #endif
1370
1371 default:
1372 return -EINVAL;
1373 }
1374
1375 ret = verify_policy_dir(p->dir);
1376 if (ret)
1377 return ret;
1378 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1379 return -EINVAL;
1380
1381 return 0;
1382 }
1383
1384 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1385 {
1386 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1387 struct xfrm_user_sec_ctx *uctx;
1388
1389 if (!rt)
1390 return 0;
1391
1392 uctx = nla_data(rt);
1393 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1394 }
1395
1396 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1397 int nr)
1398 {
1399 int i;
1400
1401 xp->xfrm_nr = nr;
1402 for (i = 0; i < nr; i++, ut++) {
1403 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1404
1405 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1406 memcpy(&t->saddr, &ut->saddr,
1407 sizeof(xfrm_address_t));
1408 t->reqid = ut->reqid;
1409 t->mode = ut->mode;
1410 t->share = ut->share;
1411 t->optional = ut->optional;
1412 t->aalgos = ut->aalgos;
1413 t->ealgos = ut->ealgos;
1414 t->calgos = ut->calgos;
1415 /* If all masks are ~0, then we allow all algorithms. */
1416 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1417 t->encap_family = ut->family;
1418 }
1419 }
1420
1421 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1422 {
1423 u16 prev_family;
1424 int i;
1425
1426 if (nr > XFRM_MAX_DEPTH)
1427 return -EINVAL;
1428
1429 prev_family = family;
1430
1431 for (i = 0; i < nr; i++) {
1432 /* We never validated the ut->family value, so many
1433 * applications simply leave it at zero. The check was
1434 * never made and ut->family was ignored because all
1435 * templates could be assumed to have the same family as
1436 * the policy itself. Now that we will have ipv4-in-ipv6
1437 * and ipv6-in-ipv4 tunnels, this is no longer true.
1438 */
1439 if (!ut[i].family)
1440 ut[i].family = family;
1441
1442 if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
1443 (ut[i].family != prev_family))
1444 return -EINVAL;
1445
1446 prev_family = ut[i].family;
1447
1448 switch (ut[i].family) {
1449 case AF_INET:
1450 break;
1451 #if IS_ENABLED(CONFIG_IPV6)
1452 case AF_INET6:
1453 break;
1454 #endif
1455 default:
1456 return -EINVAL;
1457 }
1458
1459 switch (ut[i].id.proto) {
1460 case IPPROTO_AH:
1461 case IPPROTO_ESP:
1462 case IPPROTO_COMP:
1463 #if IS_ENABLED(CONFIG_IPV6)
1464 case IPPROTO_ROUTING:
1465 case IPPROTO_DSTOPTS:
1466 #endif
1467 case IPSEC_PROTO_ANY:
1468 break;
1469 default:
1470 return -EINVAL;
1471 }
1472
1473 }
1474
1475 return 0;
1476 }
1477
1478 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1479 {
1480 struct nlattr *rt = attrs[XFRMA_TMPL];
1481
1482 if (!rt) {
1483 pol->xfrm_nr = 0;
1484 } else {
1485 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1486 int nr = nla_len(rt) / sizeof(*utmpl);
1487 int err;
1488
1489 err = validate_tmpl(nr, utmpl, pol->family);
1490 if (err)
1491 return err;
1492
1493 copy_templates(pol, utmpl, nr);
1494 }
1495 return 0;
1496 }
1497
1498 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1499 {
1500 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1501 struct xfrm_userpolicy_type *upt;
1502 u8 type = XFRM_POLICY_TYPE_MAIN;
1503 int err;
1504
1505 if (rt) {
1506 upt = nla_data(rt);
1507 type = upt->type;
1508 }
1509
1510 err = verify_policy_type(type);
1511 if (err)
1512 return err;
1513
1514 *tp = type;
1515 return 0;
1516 }
1517
1518 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1519 {
1520 xp->priority = p->priority;
1521 xp->index = p->index;
1522 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1523 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1524 xp->action = p->action;
1525 xp->flags = p->flags;
1526 xp->family = p->sel.family;
1527 /* XXX xp->share = p->share; */
1528 }
1529
1530 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1531 {
1532 memset(p, 0, sizeof(*p));
1533 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1534 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1535 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1536 p->priority = xp->priority;
1537 p->index = xp->index;
1538 p->sel.family = xp->family;
1539 p->dir = dir;
1540 p->action = xp->action;
1541 p->flags = xp->flags;
1542 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1543 }
1544
1545 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1546 {
1547 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1548 int err;
1549
1550 if (!xp) {
1551 *errp = -ENOMEM;
1552 return NULL;
1553 }
1554
1555 copy_from_user_policy(xp, p);
1556
1557 err = copy_from_user_policy_type(&xp->type, attrs);
1558 if (err)
1559 goto error;
1560
1561 if (!(err = copy_from_user_tmpl(xp, attrs)))
1562 err = copy_from_user_sec_ctx(xp, attrs);
1563 if (err)
1564 goto error;
1565
1566 xfrm_mark_get(attrs, &xp->mark);
1567
1568 return xp;
1569 error:
1570 *errp = err;
1571 xp->walk.dead = 1;
1572 xfrm_policy_destroy(xp);
1573 return NULL;
1574 }
1575
1576 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1577 struct nlattr **attrs)
1578 {
1579 struct net *net = sock_net(skb->sk);
1580 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1581 struct xfrm_policy *xp;
1582 struct km_event c;
1583 int err;
1584 int excl;
1585
1586 err = verify_newpolicy_info(p);
1587 if (err)
1588 return err;
1589 err = verify_sec_ctx_len(attrs);
1590 if (err)
1591 return err;
1592
1593 xp = xfrm_policy_construct(net, p, attrs, &err);
1594 if (!xp)
1595 return err;
1596
1597 /* shouldn't excl be based on nlh flags??
1598 * Aha! this is anti-netlink really i.e more pfkey derived
1599 * in netlink excl is a flag and you wouldnt need
1600 * a type XFRM_MSG_UPDPOLICY - JHS */
1601 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1602 err = xfrm_policy_insert(p->dir, xp, excl);
1603 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1604
1605 if (err) {
1606 security_xfrm_policy_free(xp->security);
1607 kfree(xp);
1608 return err;
1609 }
1610
1611 c.event = nlh->nlmsg_type;
1612 c.seq = nlh->nlmsg_seq;
1613 c.portid = nlh->nlmsg_pid;
1614 km_policy_notify(xp, p->dir, &c);
1615
1616 xfrm_pol_put(xp);
1617
1618 return 0;
1619 }
1620
1621 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1622 {
1623 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1624 int i;
1625
1626 if (xp->xfrm_nr == 0)
1627 return 0;
1628
1629 for (i = 0; i < xp->xfrm_nr; i++) {
1630 struct xfrm_user_tmpl *up = &vec[i];
1631 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1632
1633 memset(up, 0, sizeof(*up));
1634 memcpy(&up->id, &kp->id, sizeof(up->id));
1635 up->family = kp->encap_family;
1636 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1637 up->reqid = kp->reqid;
1638 up->mode = kp->mode;
1639 up->share = kp->share;
1640 up->optional = kp->optional;
1641 up->aalgos = kp->aalgos;
1642 up->ealgos = kp->ealgos;
1643 up->calgos = kp->calgos;
1644 }
1645
1646 return nla_put(skb, XFRMA_TMPL,
1647 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1648 }
1649
1650 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1651 {
1652 if (x->security) {
1653 return copy_sec_ctx(x->security, skb);
1654 }
1655 return 0;
1656 }
1657
1658 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1659 {
1660 if (xp->security)
1661 return copy_sec_ctx(xp->security, skb);
1662 return 0;
1663 }
1664 static inline unsigned int userpolicy_type_attrsize(void)
1665 {
1666 #ifdef CONFIG_XFRM_SUB_POLICY
1667 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1668 #else
1669 return 0;
1670 #endif
1671 }
1672
1673 #ifdef CONFIG_XFRM_SUB_POLICY
1674 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1675 {
1676 struct xfrm_userpolicy_type upt;
1677
1678 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1679 memset(&upt, 0, sizeof(upt));
1680 upt.type = type;
1681
1682 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1683 }
1684
1685 #else
1686 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1687 {
1688 return 0;
1689 }
1690 #endif
1691
1692 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1693 {
1694 struct xfrm_dump_info *sp = ptr;
1695 struct xfrm_userpolicy_info *p;
1696 struct sk_buff *in_skb = sp->in_skb;
1697 struct sk_buff *skb = sp->out_skb;
1698 struct nlmsghdr *nlh;
1699 int err;
1700
1701 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1702 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1703 if (nlh == NULL)
1704 return -EMSGSIZE;
1705
1706 p = nlmsg_data(nlh);
1707 copy_to_user_policy(xp, p, dir);
1708 err = copy_to_user_tmpl(xp, skb);
1709 if (!err)
1710 err = copy_to_user_sec_ctx(xp, skb);
1711 if (!err)
1712 err = copy_to_user_policy_type(xp->type, skb);
1713 if (!err)
1714 err = xfrm_mark_put(skb, &xp->mark);
1715 if (err) {
1716 nlmsg_cancel(skb, nlh);
1717 return err;
1718 }
1719 nlmsg_end(skb, nlh);
1720 return 0;
1721 }
1722
1723 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1724 {
1725 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1726 struct net *net = sock_net(cb->skb->sk);
1727
1728 xfrm_policy_walk_done(walk, net);
1729 return 0;
1730 }
1731
1732 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1733 {
1734 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1735
1736 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1737
1738 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1739 return 0;
1740 }
1741
1742 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1743 {
1744 struct net *net = sock_net(skb->sk);
1745 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1746 struct xfrm_dump_info info;
1747
1748 info.in_skb = cb->skb;
1749 info.out_skb = skb;
1750 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1751 info.nlmsg_flags = NLM_F_MULTI;
1752
1753 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1754
1755 return skb->len;
1756 }
1757
1758 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1759 struct xfrm_policy *xp,
1760 int dir, u32 seq)
1761 {
1762 struct xfrm_dump_info info;
1763 struct sk_buff *skb;
1764 int err;
1765
1766 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1767 if (!skb)
1768 return ERR_PTR(-ENOMEM);
1769
1770 info.in_skb = in_skb;
1771 info.out_skb = skb;
1772 info.nlmsg_seq = seq;
1773 info.nlmsg_flags = 0;
1774
1775 err = dump_one_policy(xp, dir, 0, &info);
1776 if (err) {
1777 kfree_skb(skb);
1778 return ERR_PTR(err);
1779 }
1780
1781 return skb;
1782 }
1783
1784 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1785 struct nlattr **attrs)
1786 {
1787 struct net *net = sock_net(skb->sk);
1788 struct xfrm_policy *xp;
1789 struct xfrm_userpolicy_id *p;
1790 u8 type = XFRM_POLICY_TYPE_MAIN;
1791 int err;
1792 struct km_event c;
1793 int delete;
1794 struct xfrm_mark m;
1795 u32 mark = xfrm_mark_get(attrs, &m);
1796
1797 p = nlmsg_data(nlh);
1798 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1799
1800 err = copy_from_user_policy_type(&type, attrs);
1801 if (err)
1802 return err;
1803
1804 err = verify_policy_dir(p->dir);
1805 if (err)
1806 return err;
1807
1808 if (p->index)
1809 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1810 else {
1811 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1812 struct xfrm_sec_ctx *ctx;
1813
1814 err = verify_sec_ctx_len(attrs);
1815 if (err)
1816 return err;
1817
1818 ctx = NULL;
1819 if (rt) {
1820 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1821
1822 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1823 if (err)
1824 return err;
1825 }
1826 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1827 ctx, delete, &err);
1828 security_xfrm_policy_free(ctx);
1829 }
1830 if (xp == NULL)
1831 return -ENOENT;
1832
1833 if (!delete) {
1834 struct sk_buff *resp_skb;
1835
1836 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1837 if (IS_ERR(resp_skb)) {
1838 err = PTR_ERR(resp_skb);
1839 } else {
1840 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1841 NETLINK_CB(skb).portid);
1842 }
1843 } else {
1844 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1845
1846 if (err != 0)
1847 goto out;
1848
1849 c.data.byid = p->index;
1850 c.event = nlh->nlmsg_type;
1851 c.seq = nlh->nlmsg_seq;
1852 c.portid = nlh->nlmsg_pid;
1853 km_policy_notify(xp, p->dir, &c);
1854 }
1855
1856 out:
1857 xfrm_pol_put(xp);
1858 return err;
1859 }
1860
1861 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1862 struct nlattr **attrs)
1863 {
1864 struct net *net = sock_net(skb->sk);
1865 struct km_event c;
1866 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1867 int err;
1868
1869 err = xfrm_state_flush(net, p->proto, true);
1870 if (err) {
1871 if (err == -ESRCH) /* empty table */
1872 return 0;
1873 return err;
1874 }
1875 c.data.proto = p->proto;
1876 c.event = nlh->nlmsg_type;
1877 c.seq = nlh->nlmsg_seq;
1878 c.portid = nlh->nlmsg_pid;
1879 c.net = net;
1880 km_state_notify(NULL, &c);
1881
1882 return 0;
1883 }
1884
1885 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1886 {
1887 unsigned int replay_size = x->replay_esn ?
1888 xfrm_replay_state_esn_len(x->replay_esn) :
1889 sizeof(struct xfrm_replay_state);
1890
1891 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1892 + nla_total_size(replay_size)
1893 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1894 + nla_total_size(sizeof(struct xfrm_mark))
1895 + nla_total_size(4) /* XFRM_AE_RTHR */
1896 + nla_total_size(4); /* XFRM_AE_ETHR */
1897 }
1898
1899 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1900 {
1901 struct xfrm_aevent_id *id;
1902 struct nlmsghdr *nlh;
1903 int err;
1904
1905 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1906 if (nlh == NULL)
1907 return -EMSGSIZE;
1908
1909 id = nlmsg_data(nlh);
1910 memset(&id->sa_id, 0, sizeof(id->sa_id));
1911 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1912 id->sa_id.spi = x->id.spi;
1913 id->sa_id.family = x->props.family;
1914 id->sa_id.proto = x->id.proto;
1915 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1916 id->reqid = x->props.reqid;
1917 id->flags = c->data.aevent;
1918
1919 if (x->replay_esn) {
1920 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1921 xfrm_replay_state_esn_len(x->replay_esn),
1922 x->replay_esn);
1923 } else {
1924 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1925 &x->replay);
1926 }
1927 if (err)
1928 goto out_cancel;
1929 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1930 XFRMA_PAD);
1931 if (err)
1932 goto out_cancel;
1933
1934 if (id->flags & XFRM_AE_RTHR) {
1935 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1936 if (err)
1937 goto out_cancel;
1938 }
1939 if (id->flags & XFRM_AE_ETHR) {
1940 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1941 x->replay_maxage * 10 / HZ);
1942 if (err)
1943 goto out_cancel;
1944 }
1945 err = xfrm_mark_put(skb, &x->mark);
1946 if (err)
1947 goto out_cancel;
1948
1949 nlmsg_end(skb, nlh);
1950 return 0;
1951
1952 out_cancel:
1953 nlmsg_cancel(skb, nlh);
1954 return err;
1955 }
1956
1957 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1958 struct nlattr **attrs)
1959 {
1960 struct net *net = sock_net(skb->sk);
1961 struct xfrm_state *x;
1962 struct sk_buff *r_skb;
1963 int err;
1964 struct km_event c;
1965 u32 mark;
1966 struct xfrm_mark m;
1967 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1968 struct xfrm_usersa_id *id = &p->sa_id;
1969
1970 mark = xfrm_mark_get(attrs, &m);
1971
1972 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1973 if (x == NULL)
1974 return -ESRCH;
1975
1976 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1977 if (r_skb == NULL) {
1978 xfrm_state_put(x);
1979 return -ENOMEM;
1980 }
1981
1982 /*
1983 * XXX: is this lock really needed - none of the other
1984 * gets lock (the concern is things getting updated
1985 * while we are still reading) - jhs
1986 */
1987 spin_lock_bh(&x->lock);
1988 c.data.aevent = p->flags;
1989 c.seq = nlh->nlmsg_seq;
1990 c.portid = nlh->nlmsg_pid;
1991
1992 err = build_aevent(r_skb, x, &c);
1993 BUG_ON(err < 0);
1994
1995 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1996 spin_unlock_bh(&x->lock);
1997 xfrm_state_put(x);
1998 return err;
1999 }
2000
2001 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2002 struct nlattr **attrs)
2003 {
2004 struct net *net = sock_net(skb->sk);
2005 struct xfrm_state *x;
2006 struct km_event c;
2007 int err = -EINVAL;
2008 u32 mark = 0;
2009 struct xfrm_mark m;
2010 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2011 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2012 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2013 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2014 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2015 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2016
2017 if (!lt && !rp && !re && !et && !rt)
2018 return err;
2019
2020 /* pedantic mode - thou shalt sayeth replaceth */
2021 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2022 return err;
2023
2024 mark = xfrm_mark_get(attrs, &m);
2025
2026 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2027 if (x == NULL)
2028 return -ESRCH;
2029
2030 if (x->km.state != XFRM_STATE_VALID)
2031 goto out;
2032
2033 err = xfrm_replay_verify_len(x->replay_esn, re);
2034 if (err)
2035 goto out;
2036
2037 spin_lock_bh(&x->lock);
2038 xfrm_update_ae_params(x, attrs, 1);
2039 spin_unlock_bh(&x->lock);
2040
2041 c.event = nlh->nlmsg_type;
2042 c.seq = nlh->nlmsg_seq;
2043 c.portid = nlh->nlmsg_pid;
2044 c.data.aevent = XFRM_AE_CU;
2045 km_state_notify(x, &c);
2046 err = 0;
2047 out:
2048 xfrm_state_put(x);
2049 return err;
2050 }
2051
2052 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2053 struct nlattr **attrs)
2054 {
2055 struct net *net = sock_net(skb->sk);
2056 struct km_event c;
2057 u8 type = XFRM_POLICY_TYPE_MAIN;
2058 int err;
2059
2060 err = copy_from_user_policy_type(&type, attrs);
2061 if (err)
2062 return err;
2063
2064 err = xfrm_policy_flush(net, type, true);
2065 if (err) {
2066 if (err == -ESRCH) /* empty table */
2067 return 0;
2068 return err;
2069 }
2070
2071 c.data.type = type;
2072 c.event = nlh->nlmsg_type;
2073 c.seq = nlh->nlmsg_seq;
2074 c.portid = nlh->nlmsg_pid;
2075 c.net = net;
2076 km_policy_notify(NULL, 0, &c);
2077 return 0;
2078 }
2079
2080 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2081 struct nlattr **attrs)
2082 {
2083 struct net *net = sock_net(skb->sk);
2084 struct xfrm_policy *xp;
2085 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2086 struct xfrm_userpolicy_info *p = &up->pol;
2087 u8 type = XFRM_POLICY_TYPE_MAIN;
2088 int err = -ENOENT;
2089 struct xfrm_mark m;
2090 u32 mark = xfrm_mark_get(attrs, &m);
2091
2092 err = copy_from_user_policy_type(&type, attrs);
2093 if (err)
2094 return err;
2095
2096 err = verify_policy_dir(p->dir);
2097 if (err)
2098 return err;
2099
2100 if (p->index)
2101 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2102 else {
2103 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2104 struct xfrm_sec_ctx *ctx;
2105
2106 err = verify_sec_ctx_len(attrs);
2107 if (err)
2108 return err;
2109
2110 ctx = NULL;
2111 if (rt) {
2112 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2113
2114 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2115 if (err)
2116 return err;
2117 }
2118 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2119 &p->sel, ctx, 0, &err);
2120 security_xfrm_policy_free(ctx);
2121 }
2122 if (xp == NULL)
2123 return -ENOENT;
2124
2125 if (unlikely(xp->walk.dead))
2126 goto out;
2127
2128 err = 0;
2129 if (up->hard) {
2130 xfrm_policy_delete(xp, p->dir);
2131 xfrm_audit_policy_delete(xp, 1, true);
2132 }
2133 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2134
2135 out:
2136 xfrm_pol_put(xp);
2137 return err;
2138 }
2139
2140 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2141 struct nlattr **attrs)
2142 {
2143 struct net *net = sock_net(skb->sk);
2144 struct xfrm_state *x;
2145 int err;
2146 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2147 struct xfrm_usersa_info *p = &ue->state;
2148 struct xfrm_mark m;
2149 u32 mark = xfrm_mark_get(attrs, &m);
2150
2151 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2152
2153 err = -ENOENT;
2154 if (x == NULL)
2155 return err;
2156
2157 spin_lock_bh(&x->lock);
2158 err = -EINVAL;
2159 if (x->km.state != XFRM_STATE_VALID)
2160 goto out;
2161 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2162
2163 if (ue->hard) {
2164 __xfrm_state_delete(x);
2165 xfrm_audit_state_delete(x, 1, true);
2166 }
2167 err = 0;
2168 out:
2169 spin_unlock_bh(&x->lock);
2170 xfrm_state_put(x);
2171 return err;
2172 }
2173
2174 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2175 struct nlattr **attrs)
2176 {
2177 struct net *net = sock_net(skb->sk);
2178 struct xfrm_policy *xp;
2179 struct xfrm_user_tmpl *ut;
2180 int i;
2181 struct nlattr *rt = attrs[XFRMA_TMPL];
2182 struct xfrm_mark mark;
2183
2184 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2185 struct xfrm_state *x = xfrm_state_alloc(net);
2186 int err = -ENOMEM;
2187
2188 if (!x)
2189 goto nomem;
2190
2191 xfrm_mark_get(attrs, &mark);
2192
2193 err = verify_newpolicy_info(&ua->policy);
2194 if (err)
2195 goto free_state;
2196
2197 /* build an XP */
2198 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2199 if (!xp)
2200 goto free_state;
2201
2202 memcpy(&x->id, &ua->id, sizeof(ua->id));
2203 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2204 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2205 xp->mark.m = x->mark.m = mark.m;
2206 xp->mark.v = x->mark.v = mark.v;
2207 ut = nla_data(rt);
2208 /* extract the templates and for each call km_key */
2209 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2210 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2211 memcpy(&x->id, &t->id, sizeof(x->id));
2212 x->props.mode = t->mode;
2213 x->props.reqid = t->reqid;
2214 x->props.family = ut->family;
2215 t->aalgos = ua->aalgos;
2216 t->ealgos = ua->ealgos;
2217 t->calgos = ua->calgos;
2218 err = km_query(x, t, xp);
2219
2220 }
2221
2222 kfree(x);
2223 kfree(xp);
2224
2225 return 0;
2226
2227 free_state:
2228 kfree(x);
2229 nomem:
2230 return err;
2231 }
2232
2233 #ifdef CONFIG_XFRM_MIGRATE
2234 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2235 struct xfrm_kmaddress *k,
2236 struct nlattr **attrs, int *num)
2237 {
2238 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2239 struct xfrm_user_migrate *um;
2240 int i, num_migrate;
2241
2242 if (k != NULL) {
2243 struct xfrm_user_kmaddress *uk;
2244
2245 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2246 memcpy(&k->local, &uk->local, sizeof(k->local));
2247 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2248 k->family = uk->family;
2249 k->reserved = uk->reserved;
2250 }
2251
2252 um = nla_data(rt);
2253 num_migrate = nla_len(rt) / sizeof(*um);
2254
2255 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2256 return -EINVAL;
2257
2258 for (i = 0; i < num_migrate; i++, um++, ma++) {
2259 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2260 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2261 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2262 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2263
2264 ma->proto = um->proto;
2265 ma->mode = um->mode;
2266 ma->reqid = um->reqid;
2267
2268 ma->old_family = um->old_family;
2269 ma->new_family = um->new_family;
2270 }
2271
2272 *num = i;
2273 return 0;
2274 }
2275
2276 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2277 struct nlattr **attrs)
2278 {
2279 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2280 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2281 struct xfrm_kmaddress km, *kmp;
2282 u8 type;
2283 int err;
2284 int n = 0;
2285 struct net *net = sock_net(skb->sk);
2286 struct xfrm_encap_tmpl *encap = NULL;
2287
2288 if (attrs[XFRMA_MIGRATE] == NULL)
2289 return -EINVAL;
2290
2291 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2292
2293 err = copy_from_user_policy_type(&type, attrs);
2294 if (err)
2295 return err;
2296
2297 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2298 if (err)
2299 return err;
2300
2301 if (!n)
2302 return 0;
2303
2304 if (attrs[XFRMA_ENCAP]) {
2305 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2306 sizeof(*encap), GFP_KERNEL);
2307 if (!encap)
2308 return 0;
2309 }
2310
2311 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2312
2313 kfree(encap);
2314
2315 return err;
2316 }
2317 #else
2318 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2319 struct nlattr **attrs)
2320 {
2321 return -ENOPROTOOPT;
2322 }
2323 #endif
2324
2325 #ifdef CONFIG_XFRM_MIGRATE
2326 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2327 {
2328 struct xfrm_user_migrate um;
2329
2330 memset(&um, 0, sizeof(um));
2331 um.proto = m->proto;
2332 um.mode = m->mode;
2333 um.reqid = m->reqid;
2334 um.old_family = m->old_family;
2335 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2336 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2337 um.new_family = m->new_family;
2338 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2339 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2340
2341 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2342 }
2343
2344 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2345 {
2346 struct xfrm_user_kmaddress uk;
2347
2348 memset(&uk, 0, sizeof(uk));
2349 uk.family = k->family;
2350 uk.reserved = k->reserved;
2351 memcpy(&uk.local, &k->local, sizeof(uk.local));
2352 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2353
2354 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2355 }
2356
2357 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2358 int with_encp)
2359 {
2360 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2361 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2362 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2363 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2364 + userpolicy_type_attrsize();
2365 }
2366
2367 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2368 int num_migrate, const struct xfrm_kmaddress *k,
2369 const struct xfrm_selector *sel,
2370 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2371 {
2372 const struct xfrm_migrate *mp;
2373 struct xfrm_userpolicy_id *pol_id;
2374 struct nlmsghdr *nlh;
2375 int i, err;
2376
2377 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2378 if (nlh == NULL)
2379 return -EMSGSIZE;
2380
2381 pol_id = nlmsg_data(nlh);
2382 /* copy data from selector, dir, and type to the pol_id */
2383 memset(pol_id, 0, sizeof(*pol_id));
2384 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2385 pol_id->dir = dir;
2386
2387 if (k != NULL) {
2388 err = copy_to_user_kmaddress(k, skb);
2389 if (err)
2390 goto out_cancel;
2391 }
2392 if (encap) {
2393 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2394 if (err)
2395 goto out_cancel;
2396 }
2397 err = copy_to_user_policy_type(type, skb);
2398 if (err)
2399 goto out_cancel;
2400 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2401 err = copy_to_user_migrate(mp, skb);
2402 if (err)
2403 goto out_cancel;
2404 }
2405
2406 nlmsg_end(skb, nlh);
2407 return 0;
2408
2409 out_cancel:
2410 nlmsg_cancel(skb, nlh);
2411 return err;
2412 }
2413
2414 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2415 const struct xfrm_migrate *m, int num_migrate,
2416 const struct xfrm_kmaddress *k,
2417 const struct xfrm_encap_tmpl *encap)
2418 {
2419 struct net *net = &init_net;
2420 struct sk_buff *skb;
2421 int err;
2422
2423 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2424 GFP_ATOMIC);
2425 if (skb == NULL)
2426 return -ENOMEM;
2427
2428 /* build migrate */
2429 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2430 BUG_ON(err < 0);
2431
2432 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2433 }
2434 #else
2435 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2436 const struct xfrm_migrate *m, int num_migrate,
2437 const struct xfrm_kmaddress *k,
2438 const struct xfrm_encap_tmpl *encap)
2439 {
2440 return -ENOPROTOOPT;
2441 }
2442 #endif
2443
2444 #define XMSGSIZE(type) sizeof(struct type)
2445
2446 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2447 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2448 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2449 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2450 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2451 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2452 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2453 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2454 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2455 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2456 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2457 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2458 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2459 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2460 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2461 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2462 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2463 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2464 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2465 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2466 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2467 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2468 };
2469
2470 #undef XMSGSIZE
2471
2472 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2473 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2474 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2475 [XFRMA_LASTUSED] = { .type = NLA_U64},
2476 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2477 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2478 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2479 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2480 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2481 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2482 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2483 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2484 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2485 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2486 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2487 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2488 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2489 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2490 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2491 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2492 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2493 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2494 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2495 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2496 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2497 [XFRMA_PROTO] = { .type = NLA_U8 },
2498 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2499 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2500 [XFRMA_OUTPUT_MARK] = { .type = NLA_U32 },
2501 };
2502
2503 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2504 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2505 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2506 };
2507
2508 static const struct xfrm_link {
2509 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2510 int (*start)(struct netlink_callback *);
2511 int (*dump)(struct sk_buff *, struct netlink_callback *);
2512 int (*done)(struct netlink_callback *);
2513 const struct nla_policy *nla_pol;
2514 int nla_max;
2515 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2516 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2517 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2518 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2519 .dump = xfrm_dump_sa,
2520 .done = xfrm_dump_sa_done },
2521 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2522 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2523 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2524 .start = xfrm_dump_policy_start,
2525 .dump = xfrm_dump_policy,
2526 .done = xfrm_dump_policy_done },
2527 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2528 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2529 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2530 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2531 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2532 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2533 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2534 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2535 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2536 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2537 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2538 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2539 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2540 .nla_pol = xfrma_spd_policy,
2541 .nla_max = XFRMA_SPD_MAX },
2542 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2543 };
2544
2545 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2546 struct netlink_ext_ack *extack)
2547 {
2548 struct net *net = sock_net(skb->sk);
2549 struct nlattr *attrs[XFRMA_MAX+1];
2550 const struct xfrm_link *link;
2551 int type, err;
2552
2553 #ifdef CONFIG_COMPAT
2554 if (in_compat_syscall())
2555 return -EOPNOTSUPP;
2556 #endif
2557
2558 type = nlh->nlmsg_type;
2559 if (type > XFRM_MSG_MAX)
2560 return -EINVAL;
2561
2562 type -= XFRM_MSG_BASE;
2563 link = &xfrm_dispatch[type];
2564
2565 /* All operations require privileges, even GET */
2566 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2567 return -EPERM;
2568
2569 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2570 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2571 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2572 if (link->dump == NULL)
2573 return -EINVAL;
2574
2575 {
2576 struct netlink_dump_control c = {
2577 .start = link->start,
2578 .dump = link->dump,
2579 .done = link->done,
2580 };
2581 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2582 }
2583 }
2584
2585 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2586 link->nla_max ? : XFRMA_MAX,
2587 link->nla_pol ? : xfrma_policy, extack);
2588 if (err < 0)
2589 return err;
2590
2591 if (link->doit == NULL)
2592 return -EINVAL;
2593
2594 return link->doit(skb, nlh, attrs);
2595 }
2596
2597 static void xfrm_netlink_rcv(struct sk_buff *skb)
2598 {
2599 struct net *net = sock_net(skb->sk);
2600
2601 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2602 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2603 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2604 }
2605
2606 static inline unsigned int xfrm_expire_msgsize(void)
2607 {
2608 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2609 + nla_total_size(sizeof(struct xfrm_mark));
2610 }
2611
2612 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2613 {
2614 struct xfrm_user_expire *ue;
2615 struct nlmsghdr *nlh;
2616 int err;
2617
2618 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2619 if (nlh == NULL)
2620 return -EMSGSIZE;
2621
2622 ue = nlmsg_data(nlh);
2623 copy_to_user_state(x, &ue->state);
2624 ue->hard = (c->data.hard != 0) ? 1 : 0;
2625 /* clear the padding bytes */
2626 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2627
2628 err = xfrm_mark_put(skb, &x->mark);
2629 if (err)
2630 return err;
2631
2632 nlmsg_end(skb, nlh);
2633 return 0;
2634 }
2635
2636 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2637 {
2638 struct net *net = xs_net(x);
2639 struct sk_buff *skb;
2640
2641 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2642 if (skb == NULL)
2643 return -ENOMEM;
2644
2645 if (build_expire(skb, x, c) < 0) {
2646 kfree_skb(skb);
2647 return -EMSGSIZE;
2648 }
2649
2650 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2651 }
2652
2653 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2654 {
2655 struct net *net = xs_net(x);
2656 struct sk_buff *skb;
2657 int err;
2658
2659 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2660 if (skb == NULL)
2661 return -ENOMEM;
2662
2663 err = build_aevent(skb, x, c);
2664 BUG_ON(err < 0);
2665
2666 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2667 }
2668
2669 static int xfrm_notify_sa_flush(const struct km_event *c)
2670 {
2671 struct net *net = c->net;
2672 struct xfrm_usersa_flush *p;
2673 struct nlmsghdr *nlh;
2674 struct sk_buff *skb;
2675 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2676
2677 skb = nlmsg_new(len, GFP_ATOMIC);
2678 if (skb == NULL)
2679 return -ENOMEM;
2680
2681 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2682 if (nlh == NULL) {
2683 kfree_skb(skb);
2684 return -EMSGSIZE;
2685 }
2686
2687 p = nlmsg_data(nlh);
2688 p->proto = c->data.proto;
2689
2690 nlmsg_end(skb, nlh);
2691
2692 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2693 }
2694
2695 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2696 {
2697 unsigned int l = 0;
2698 if (x->aead)
2699 l += nla_total_size(aead_len(x->aead));
2700 if (x->aalg) {
2701 l += nla_total_size(sizeof(struct xfrm_algo) +
2702 (x->aalg->alg_key_len + 7) / 8);
2703 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2704 }
2705 if (x->ealg)
2706 l += nla_total_size(xfrm_alg_len(x->ealg));
2707 if (x->calg)
2708 l += nla_total_size(sizeof(*x->calg));
2709 if (x->encap)
2710 l += nla_total_size(sizeof(*x->encap));
2711 if (x->tfcpad)
2712 l += nla_total_size(sizeof(x->tfcpad));
2713 if (x->replay_esn)
2714 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2715 else
2716 l += nla_total_size(sizeof(struct xfrm_replay_state));
2717 if (x->security)
2718 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2719 x->security->ctx_len);
2720 if (x->coaddr)
2721 l += nla_total_size(sizeof(*x->coaddr));
2722 if (x->props.extra_flags)
2723 l += nla_total_size(sizeof(x->props.extra_flags));
2724 if (x->xso.dev)
2725 l += nla_total_size(sizeof(x->xso));
2726 if (x->props.output_mark)
2727 l += nla_total_size(sizeof(x->props.output_mark));
2728
2729 /* Must count x->lastused as it may become non-zero behind our back. */
2730 l += nla_total_size_64bit(sizeof(u64));
2731
2732 return l;
2733 }
2734
2735 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2736 {
2737 struct net *net = xs_net(x);
2738 struct xfrm_usersa_info *p;
2739 struct xfrm_usersa_id *id;
2740 struct nlmsghdr *nlh;
2741 struct sk_buff *skb;
2742 unsigned int len = xfrm_sa_len(x);
2743 unsigned int headlen;
2744 int err;
2745
2746 headlen = sizeof(*p);
2747 if (c->event == XFRM_MSG_DELSA) {
2748 len += nla_total_size(headlen);
2749 headlen = sizeof(*id);
2750 len += nla_total_size(sizeof(struct xfrm_mark));
2751 }
2752 len += NLMSG_ALIGN(headlen);
2753
2754 skb = nlmsg_new(len, GFP_ATOMIC);
2755 if (skb == NULL)
2756 return -ENOMEM;
2757
2758 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2759 err = -EMSGSIZE;
2760 if (nlh == NULL)
2761 goto out_free_skb;
2762
2763 p = nlmsg_data(nlh);
2764 if (c->event == XFRM_MSG_DELSA) {
2765 struct nlattr *attr;
2766
2767 id = nlmsg_data(nlh);
2768 memset(id, 0, sizeof(*id));
2769 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2770 id->spi = x->id.spi;
2771 id->family = x->props.family;
2772 id->proto = x->id.proto;
2773
2774 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2775 err = -EMSGSIZE;
2776 if (attr == NULL)
2777 goto out_free_skb;
2778
2779 p = nla_data(attr);
2780 }
2781 err = copy_to_user_state_extra(x, p, skb);
2782 if (err)
2783 goto out_free_skb;
2784
2785 nlmsg_end(skb, nlh);
2786
2787 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2788
2789 out_free_skb:
2790 kfree_skb(skb);
2791 return err;
2792 }
2793
2794 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2795 {
2796
2797 switch (c->event) {
2798 case XFRM_MSG_EXPIRE:
2799 return xfrm_exp_state_notify(x, c);
2800 case XFRM_MSG_NEWAE:
2801 return xfrm_aevent_state_notify(x, c);
2802 case XFRM_MSG_DELSA:
2803 case XFRM_MSG_UPDSA:
2804 case XFRM_MSG_NEWSA:
2805 return xfrm_notify_sa(x, c);
2806 case XFRM_MSG_FLUSHSA:
2807 return xfrm_notify_sa_flush(c);
2808 default:
2809 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2810 c->event);
2811 break;
2812 }
2813
2814 return 0;
2815
2816 }
2817
2818 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2819 struct xfrm_policy *xp)
2820 {
2821 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2822 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2823 + nla_total_size(sizeof(struct xfrm_mark))
2824 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2825 + userpolicy_type_attrsize();
2826 }
2827
2828 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2829 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2830 {
2831 __u32 seq = xfrm_get_acqseq();
2832 struct xfrm_user_acquire *ua;
2833 struct nlmsghdr *nlh;
2834 int err;
2835
2836 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2837 if (nlh == NULL)
2838 return -EMSGSIZE;
2839
2840 ua = nlmsg_data(nlh);
2841 memcpy(&ua->id, &x->id, sizeof(ua->id));
2842 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2843 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2844 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2845 ua->aalgos = xt->aalgos;
2846 ua->ealgos = xt->ealgos;
2847 ua->calgos = xt->calgos;
2848 ua->seq = x->km.seq = seq;
2849
2850 err = copy_to_user_tmpl(xp, skb);
2851 if (!err)
2852 err = copy_to_user_state_sec_ctx(x, skb);
2853 if (!err)
2854 err = copy_to_user_policy_type(xp->type, skb);
2855 if (!err)
2856 err = xfrm_mark_put(skb, &xp->mark);
2857 if (err) {
2858 nlmsg_cancel(skb, nlh);
2859 return err;
2860 }
2861
2862 nlmsg_end(skb, nlh);
2863 return 0;
2864 }
2865
2866 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2867 struct xfrm_policy *xp)
2868 {
2869 struct net *net = xs_net(x);
2870 struct sk_buff *skb;
2871 int err;
2872
2873 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2874 if (skb == NULL)
2875 return -ENOMEM;
2876
2877 err = build_acquire(skb, x, xt, xp);
2878 BUG_ON(err < 0);
2879
2880 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2881 }
2882
2883 /* User gives us xfrm_user_policy_info followed by an array of 0
2884 * or more templates.
2885 */
2886 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2887 u8 *data, int len, int *dir)
2888 {
2889 struct net *net = sock_net(sk);
2890 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2891 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2892 struct xfrm_policy *xp;
2893 int nr;
2894
2895 switch (sk->sk_family) {
2896 case AF_INET:
2897 if (opt != IP_XFRM_POLICY) {
2898 *dir = -EOPNOTSUPP;
2899 return NULL;
2900 }
2901 break;
2902 #if IS_ENABLED(CONFIG_IPV6)
2903 case AF_INET6:
2904 if (opt != IPV6_XFRM_POLICY) {
2905 *dir = -EOPNOTSUPP;
2906 return NULL;
2907 }
2908 break;
2909 #endif
2910 default:
2911 *dir = -EINVAL;
2912 return NULL;
2913 }
2914
2915 *dir = -EINVAL;
2916
2917 if (len < sizeof(*p) ||
2918 verify_newpolicy_info(p))
2919 return NULL;
2920
2921 nr = ((len - sizeof(*p)) / sizeof(*ut));
2922 if (validate_tmpl(nr, ut, p->sel.family))
2923 return NULL;
2924
2925 if (p->dir > XFRM_POLICY_OUT)
2926 return NULL;
2927
2928 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2929 if (xp == NULL) {
2930 *dir = -ENOBUFS;
2931 return NULL;
2932 }
2933
2934 copy_from_user_policy(xp, p);
2935 xp->type = XFRM_POLICY_TYPE_MAIN;
2936 copy_templates(xp, ut, nr);
2937
2938 *dir = p->dir;
2939
2940 return xp;
2941 }
2942
2943 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2944 {
2945 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2946 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2947 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2948 + nla_total_size(sizeof(struct xfrm_mark))
2949 + userpolicy_type_attrsize();
2950 }
2951
2952 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2953 int dir, const struct km_event *c)
2954 {
2955 struct xfrm_user_polexpire *upe;
2956 int hard = c->data.hard;
2957 struct nlmsghdr *nlh;
2958 int err;
2959
2960 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2961 if (nlh == NULL)
2962 return -EMSGSIZE;
2963
2964 upe = nlmsg_data(nlh);
2965 copy_to_user_policy(xp, &upe->pol, dir);
2966 err = copy_to_user_tmpl(xp, skb);
2967 if (!err)
2968 err = copy_to_user_sec_ctx(xp, skb);
2969 if (!err)
2970 err = copy_to_user_policy_type(xp->type, skb);
2971 if (!err)
2972 err = xfrm_mark_put(skb, &xp->mark);
2973 if (err) {
2974 nlmsg_cancel(skb, nlh);
2975 return err;
2976 }
2977 upe->hard = !!hard;
2978
2979 nlmsg_end(skb, nlh);
2980 return 0;
2981 }
2982
2983 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2984 {
2985 struct net *net = xp_net(xp);
2986 struct sk_buff *skb;
2987 int err;
2988
2989 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2990 if (skb == NULL)
2991 return -ENOMEM;
2992
2993 err = build_polexpire(skb, xp, dir, c);
2994 BUG_ON(err < 0);
2995
2996 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2997 }
2998
2999 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3000 {
3001 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3002 struct net *net = xp_net(xp);
3003 struct xfrm_userpolicy_info *p;
3004 struct xfrm_userpolicy_id *id;
3005 struct nlmsghdr *nlh;
3006 struct sk_buff *skb;
3007 unsigned int headlen;
3008 int err;
3009
3010 headlen = sizeof(*p);
3011 if (c->event == XFRM_MSG_DELPOLICY) {
3012 len += nla_total_size(headlen);
3013 headlen = sizeof(*id);
3014 }
3015 len += userpolicy_type_attrsize();
3016 len += nla_total_size(sizeof(struct xfrm_mark));
3017 len += NLMSG_ALIGN(headlen);
3018
3019 skb = nlmsg_new(len, GFP_ATOMIC);
3020 if (skb == NULL)
3021 return -ENOMEM;
3022
3023 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3024 err = -EMSGSIZE;
3025 if (nlh == NULL)
3026 goto out_free_skb;
3027
3028 p = nlmsg_data(nlh);
3029 if (c->event == XFRM_MSG_DELPOLICY) {
3030 struct nlattr *attr;
3031
3032 id = nlmsg_data(nlh);
3033 memset(id, 0, sizeof(*id));
3034 id->dir = dir;
3035 if (c->data.byid)
3036 id->index = xp->index;
3037 else
3038 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3039
3040 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3041 err = -EMSGSIZE;
3042 if (attr == NULL)
3043 goto out_free_skb;
3044
3045 p = nla_data(attr);
3046 }
3047
3048 copy_to_user_policy(xp, p, dir);
3049 err = copy_to_user_tmpl(xp, skb);
3050 if (!err)
3051 err = copy_to_user_policy_type(xp->type, skb);
3052 if (!err)
3053 err = xfrm_mark_put(skb, &xp->mark);
3054 if (err)
3055 goto out_free_skb;
3056
3057 nlmsg_end(skb, nlh);
3058
3059 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3060
3061 out_free_skb:
3062 kfree_skb(skb);
3063 return err;
3064 }
3065
3066 static int xfrm_notify_policy_flush(const struct km_event *c)
3067 {
3068 struct net *net = c->net;
3069 struct nlmsghdr *nlh;
3070 struct sk_buff *skb;
3071 int err;
3072
3073 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3074 if (skb == NULL)
3075 return -ENOMEM;
3076
3077 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3078 err = -EMSGSIZE;
3079 if (nlh == NULL)
3080 goto out_free_skb;
3081 err = copy_to_user_policy_type(c->data.type, skb);
3082 if (err)
3083 goto out_free_skb;
3084
3085 nlmsg_end(skb, nlh);
3086
3087 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3088
3089 out_free_skb:
3090 kfree_skb(skb);
3091 return err;
3092 }
3093
3094 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3095 {
3096
3097 switch (c->event) {
3098 case XFRM_MSG_NEWPOLICY:
3099 case XFRM_MSG_UPDPOLICY:
3100 case XFRM_MSG_DELPOLICY:
3101 return xfrm_notify_policy(xp, dir, c);
3102 case XFRM_MSG_FLUSHPOLICY:
3103 return xfrm_notify_policy_flush(c);
3104 case XFRM_MSG_POLEXPIRE:
3105 return xfrm_exp_policy_notify(xp, dir, c);
3106 default:
3107 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3108 c->event);
3109 }
3110
3111 return 0;
3112
3113 }
3114
3115 static inline unsigned int xfrm_report_msgsize(void)
3116 {
3117 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3118 }
3119
3120 static int build_report(struct sk_buff *skb, u8 proto,
3121 struct xfrm_selector *sel, xfrm_address_t *addr)
3122 {
3123 struct xfrm_user_report *ur;
3124 struct nlmsghdr *nlh;
3125
3126 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3127 if (nlh == NULL)
3128 return -EMSGSIZE;
3129
3130 ur = nlmsg_data(nlh);
3131 ur->proto = proto;
3132 memcpy(&ur->sel, sel, sizeof(ur->sel));
3133
3134 if (addr) {
3135 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3136 if (err) {
3137 nlmsg_cancel(skb, nlh);
3138 return err;
3139 }
3140 }
3141 nlmsg_end(skb, nlh);
3142 return 0;
3143 }
3144
3145 static int xfrm_send_report(struct net *net, u8 proto,
3146 struct xfrm_selector *sel, xfrm_address_t *addr)
3147 {
3148 struct sk_buff *skb;
3149 int err;
3150
3151 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3152 if (skb == NULL)
3153 return -ENOMEM;
3154
3155 err = build_report(skb, proto, sel, addr);
3156 BUG_ON(err < 0);
3157
3158 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3159 }
3160
3161 static inline unsigned int xfrm_mapping_msgsize(void)
3162 {
3163 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3164 }
3165
3166 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3167 xfrm_address_t *new_saddr, __be16 new_sport)
3168 {
3169 struct xfrm_user_mapping *um;
3170 struct nlmsghdr *nlh;
3171
3172 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3173 if (nlh == NULL)
3174 return -EMSGSIZE;
3175
3176 um = nlmsg_data(nlh);
3177
3178 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3179 um->id.spi = x->id.spi;
3180 um->id.family = x->props.family;
3181 um->id.proto = x->id.proto;
3182 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3183 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3184 um->new_sport = new_sport;
3185 um->old_sport = x->encap->encap_sport;
3186 um->reqid = x->props.reqid;
3187
3188 nlmsg_end(skb, nlh);
3189 return 0;
3190 }
3191
3192 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3193 __be16 sport)
3194 {
3195 struct net *net = xs_net(x);
3196 struct sk_buff *skb;
3197 int err;
3198
3199 if (x->id.proto != IPPROTO_ESP)
3200 return -EINVAL;
3201
3202 if (!x->encap)
3203 return -EINVAL;
3204
3205 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3206 if (skb == NULL)
3207 return -ENOMEM;
3208
3209 err = build_mapping(skb, x, ipaddr, sport);
3210 BUG_ON(err < 0);
3211
3212 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3213 }
3214
3215 static bool xfrm_is_alive(const struct km_event *c)
3216 {
3217 return (bool)xfrm_acquire_is_on(c->net);
3218 }
3219
3220 static struct xfrm_mgr netlink_mgr = {
3221 .notify = xfrm_send_state_notify,
3222 .acquire = xfrm_send_acquire,
3223 .compile_policy = xfrm_compile_policy,
3224 .notify_policy = xfrm_send_policy_notify,
3225 .report = xfrm_send_report,
3226 .migrate = xfrm_send_migrate,
3227 .new_mapping = xfrm_send_mapping,
3228 .is_alive = xfrm_is_alive,
3229 };
3230
3231 static int __net_init xfrm_user_net_init(struct net *net)
3232 {
3233 struct sock *nlsk;
3234 struct netlink_kernel_cfg cfg = {
3235 .groups = XFRMNLGRP_MAX,
3236 .input = xfrm_netlink_rcv,
3237 };
3238
3239 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3240 if (nlsk == NULL)
3241 return -ENOMEM;
3242 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3243 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3244 return 0;
3245 }
3246
3247 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3248 {
3249 struct net *net;
3250 list_for_each_entry(net, net_exit_list, exit_list)
3251 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3252 synchronize_net();
3253 list_for_each_entry(net, net_exit_list, exit_list)
3254 netlink_kernel_release(net->xfrm.nlsk_stash);
3255 }
3256
3257 static struct pernet_operations xfrm_user_net_ops = {
3258 .init = xfrm_user_net_init,
3259 .exit_batch = xfrm_user_net_exit,
3260 };
3261
3262 static int __init xfrm_user_init(void)
3263 {
3264 int rv;
3265
3266 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3267
3268 rv = register_pernet_subsys(&xfrm_user_net_ops);
3269 if (rv < 0)
3270 return rv;
3271 rv = xfrm_register_km(&netlink_mgr);
3272 if (rv < 0)
3273 unregister_pernet_subsys(&xfrm_user_net_ops);
3274 return rv;
3275 }
3276
3277 static void __exit xfrm_user_exit(void)
3278 {
3279 xfrm_unregister_km(&netlink_mgr);
3280 unregister_pernet_subsys(&xfrm_user_net_ops);
3281 }
3282
3283 module_init(xfrm_user_init);
3284 module_exit(xfrm_user_exit);
3285 MODULE_LICENSE("GPL");
3286 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3287
ubuntu-bionic-kernel mirror