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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / xfrm / xfrm_user.c
blob7f52b8eb177db4978750caed402aa34f6a31d7b4
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <linux/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 #include <asm/unaligned.h>
35
36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
37 {
38 struct nlattr *rt = attrs[type];
39 struct xfrm_algo *algp;
40
41 if (!rt)
42 return 0;
43
44 algp = nla_data(rt);
45 if (nla_len(rt) < (int)xfrm_alg_len(algp))
46 return -EINVAL;
47
48 switch (type) {
49 case XFRMA_ALG_AUTH:
50 case XFRMA_ALG_CRYPT:
51 case XFRMA_ALG_COMP:
52 break;
53
54 default:
55 return -EINVAL;
56 }
57
58 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
59 return 0;
60 }
61
62 static int verify_auth_trunc(struct nlattr **attrs)
63 {
64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
65 struct xfrm_algo_auth *algp;
66
67 if (!rt)
68 return 0;
69
70 algp = nla_data(rt);
71 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
72 return -EINVAL;
73
74 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
75 return 0;
76 }
77
78 static int verify_aead(struct nlattr **attrs)
79 {
80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
81 struct xfrm_algo_aead *algp;
82
83 if (!rt)
84 return 0;
85
86 algp = nla_data(rt);
87 if (nla_len(rt) < (int)aead_len(algp))
88 return -EINVAL;
89
90 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
91 return 0;
92 }
93
94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
95 xfrm_address_t **addrp)
96 {
97 struct nlattr *rt = attrs[type];
98
99 if (rt && addrp)
100 *addrp = nla_data(rt);
101 }
102
103 static inline int verify_sec_ctx_len(struct nlattr **attrs)
104 {
105 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
106 struct xfrm_user_sec_ctx *uctx;
107
108 if (!rt)
109 return 0;
110
111 uctx = nla_data(rt);
112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
113 return -EINVAL;
114
115 return 0;
116 }
117
118 static inline int verify_replay(struct xfrm_usersa_info *p,
119 struct nlattr **attrs)
120 {
121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
122 struct xfrm_replay_state_esn *rs;
123
124 if (p->flags & XFRM_STATE_ESN) {
125 if (!rt)
126 return -EINVAL;
127
128 rs = nla_data(rt);
129
130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
131 return -EINVAL;
132
133 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
134 nla_len(rt) != sizeof(*rs))
135 return -EINVAL;
136 }
137
138 if (!rt)
139 return 0;
140
141 /* As only ESP and AH support ESN feature. */
142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
143 return -EINVAL;
144
145 if (p->replay_window != 0)
146 return -EINVAL;
147
148 return 0;
149 }
150
151 static int verify_newsa_info(struct xfrm_usersa_info *p,
152 struct nlattr **attrs)
153 {
154 int err;
155
156 err = -EINVAL;
157 switch (p->family) {
158 case AF_INET:
159 break;
160
161 case AF_INET6:
162 #if IS_ENABLED(CONFIG_IPV6)
163 break;
164 #else
165 err = -EAFNOSUPPORT;
166 goto out;
167 #endif
168
169 default:
170 goto out;
171 }
172
173 err = -EINVAL;
174 switch (p->id.proto) {
175 case IPPROTO_AH:
176 if ((!attrs[XFRMA_ALG_AUTH] &&
177 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
178 attrs[XFRMA_ALG_AEAD] ||
179 attrs[XFRMA_ALG_CRYPT] ||
180 attrs[XFRMA_ALG_COMP] ||
181 attrs[XFRMA_TFCPAD])
182 goto out;
183 break;
184
185 case IPPROTO_ESP:
186 if (attrs[XFRMA_ALG_COMP])
187 goto out;
188 if (!attrs[XFRMA_ALG_AUTH] &&
189 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
190 !attrs[XFRMA_ALG_CRYPT] &&
191 !attrs[XFRMA_ALG_AEAD])
192 goto out;
193 if ((attrs[XFRMA_ALG_AUTH] ||
194 attrs[XFRMA_ALG_AUTH_TRUNC] ||
195 attrs[XFRMA_ALG_CRYPT]) &&
196 attrs[XFRMA_ALG_AEAD])
197 goto out;
198 if (attrs[XFRMA_TFCPAD] &&
199 p->mode != XFRM_MODE_TUNNEL)
200 goto out;
201 break;
202
203 case IPPROTO_COMP:
204 if (!attrs[XFRMA_ALG_COMP] ||
205 attrs[XFRMA_ALG_AEAD] ||
206 attrs[XFRMA_ALG_AUTH] ||
207 attrs[XFRMA_ALG_AUTH_TRUNC] ||
208 attrs[XFRMA_ALG_CRYPT] ||
209 attrs[XFRMA_TFCPAD] ||
210 (ntohl(p->id.spi) >= 0x10000))
211 goto out;
212 break;
213
214 #if IS_ENABLED(CONFIG_IPV6)
215 case IPPROTO_DSTOPTS:
216 case IPPROTO_ROUTING:
217 if (attrs[XFRMA_ALG_COMP] ||
218 attrs[XFRMA_ALG_AUTH] ||
219 attrs[XFRMA_ALG_AUTH_TRUNC] ||
220 attrs[XFRMA_ALG_AEAD] ||
221 attrs[XFRMA_ALG_CRYPT] ||
222 attrs[XFRMA_ENCAP] ||
223 attrs[XFRMA_SEC_CTX] ||
224 attrs[XFRMA_TFCPAD] ||
225 !attrs[XFRMA_COADDR])
226 goto out;
227 break;
228 #endif
229
230 default:
231 goto out;
232 }
233
234 if ((err = verify_aead(attrs)))
235 goto out;
236 if ((err = verify_auth_trunc(attrs)))
237 goto out;
238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
239 goto out;
240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
241 goto out;
242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
243 goto out;
244 if ((err = verify_sec_ctx_len(attrs)))
245 goto out;
246 if ((err = verify_replay(p, attrs)))
247 goto out;
248
249 err = -EINVAL;
250 switch (p->mode) {
251 case XFRM_MODE_TRANSPORT:
252 case XFRM_MODE_TUNNEL:
253 case XFRM_MODE_ROUTEOPTIMIZATION:
254 case XFRM_MODE_BEET:
255 break;
256
257 default:
258 goto out;
259 }
260
261 err = 0;
262
263 out:
264 return err;
265 }
266
267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
268 struct xfrm_algo_desc *(*get_byname)(const char *, int),
269 struct nlattr *rta)
270 {
271 struct xfrm_algo *p, *ualg;
272 struct xfrm_algo_desc *algo;
273
274 if (!rta)
275 return 0;
276
277 ualg = nla_data(rta);
278
279 algo = get_byname(ualg->alg_name, 1);
280 if (!algo)
281 return -ENOSYS;
282 *props = algo->desc.sadb_alg_id;
283
284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
285 if (!p)
286 return -ENOMEM;
287
288 strcpy(p->alg_name, algo->name);
289 *algpp = p;
290 return 0;
291 }
292
293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
294 {
295 struct xfrm_algo *p, *ualg;
296 struct xfrm_algo_desc *algo;
297
298 if (!rta)
299 return 0;
300
301 ualg = nla_data(rta);
302
303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
304 if (!algo)
305 return -ENOSYS;
306 x->props.ealgo = algo->desc.sadb_alg_id;
307
308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
309 if (!p)
310 return -ENOMEM;
311
312 strcpy(p->alg_name, algo->name);
313 x->ealg = p;
314 x->geniv = algo->uinfo.encr.geniv;
315 return 0;
316 }
317
318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
319 struct nlattr *rta)
320 {
321 struct xfrm_algo *ualg;
322 struct xfrm_algo_auth *p;
323 struct xfrm_algo_desc *algo;
324
325 if (!rta)
326 return 0;
327
328 ualg = nla_data(rta);
329
330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
331 if (!algo)
332 return -ENOSYS;
333 *props = algo->desc.sadb_alg_id;
334
335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
336 if (!p)
337 return -ENOMEM;
338
339 strcpy(p->alg_name, algo->name);
340 p->alg_key_len = ualg->alg_key_len;
341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
343
344 *algpp = p;
345 return 0;
346 }
347
348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
349 struct nlattr *rta)
350 {
351 struct xfrm_algo_auth *p, *ualg;
352 struct xfrm_algo_desc *algo;
353
354 if (!rta)
355 return 0;
356
357 ualg = nla_data(rta);
358
359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
360 if (!algo)
361 return -ENOSYS;
362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
363 return -EINVAL;
364 *props = algo->desc.sadb_alg_id;
365
366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
367 if (!p)
368 return -ENOMEM;
369
370 strcpy(p->alg_name, algo->name);
371 if (!p->alg_trunc_len)
372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
373
374 *algpp = p;
375 return 0;
376 }
377
378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
379 {
380 struct xfrm_algo_aead *p, *ualg;
381 struct xfrm_algo_desc *algo;
382
383 if (!rta)
384 return 0;
385
386 ualg = nla_data(rta);
387
388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
389 if (!algo)
390 return -ENOSYS;
391 x->props.ealgo = algo->desc.sadb_alg_id;
392
393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
394 if (!p)
395 return -ENOMEM;
396
397 strcpy(p->alg_name, algo->name);
398 x->aead = p;
399 x->geniv = algo->uinfo.aead.geniv;
400 return 0;
401 }
402
403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
404 struct nlattr *rp)
405 {
406 struct xfrm_replay_state_esn *up;
407 unsigned int ulen;
408
409 if (!replay_esn || !rp)
410 return 0;
411
412 up = nla_data(rp);
413 ulen = xfrm_replay_state_esn_len(up);
414
415 /* Check the overall length and the internal bitmap length to avoid
416 * potential overflow. */
417 if (nla_len(rp) < (int)ulen ||
418 xfrm_replay_state_esn_len(replay_esn) != ulen ||
419 replay_esn->bmp_len != up->bmp_len)
420 return -EINVAL;
421
422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
423 return -EINVAL;
424
425 return 0;
426 }
427
428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
429 struct xfrm_replay_state_esn **preplay_esn,
430 struct nlattr *rta)
431 {
432 struct xfrm_replay_state_esn *p, *pp, *up;
433 unsigned int klen, ulen;
434
435 if (!rta)
436 return 0;
437
438 up = nla_data(rta);
439 klen = xfrm_replay_state_esn_len(up);
440 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
441
442 p = kzalloc(klen, GFP_KERNEL);
443 if (!p)
444 return -ENOMEM;
445
446 pp = kzalloc(klen, GFP_KERNEL);
447 if (!pp) {
448 kfree(p);
449 return -ENOMEM;
450 }
451
452 memcpy(p, up, ulen);
453 memcpy(pp, up, ulen);
454
455 *replay_esn = p;
456 *preplay_esn = pp;
457
458 return 0;
459 }
460
461 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
462 {
463 unsigned int len = 0;
464
465 if (xfrm_ctx) {
466 len += sizeof(struct xfrm_user_sec_ctx);
467 len += xfrm_ctx->ctx_len;
468 }
469 return len;
470 }
471
472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
473 {
474 memcpy(&x->id, &p->id, sizeof(x->id));
475 memcpy(&x->sel, &p->sel, sizeof(x->sel));
476 memcpy(&x->lft, &p->lft, sizeof(x->lft));
477 x->props.mode = p->mode;
478 x->props.replay_window = min_t(unsigned int, p->replay_window,
479 sizeof(x->replay.bitmap) * 8);
480 x->props.reqid = p->reqid;
481 x->props.family = p->family;
482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
483 x->props.flags = p->flags;
484
485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
486 x->sel.family = p->family;
487 }
488
489 /*
490 * someday when pfkey also has support, we could have the code
491 * somehow made shareable and move it to xfrm_state.c - JHS
492 *
493 */
494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
495 int update_esn)
496 {
497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
502
503 if (re) {
504 struct xfrm_replay_state_esn *replay_esn;
505 replay_esn = nla_data(re);
506 memcpy(x->replay_esn, replay_esn,
507 xfrm_replay_state_esn_len(replay_esn));
508 memcpy(x->preplay_esn, replay_esn,
509 xfrm_replay_state_esn_len(replay_esn));
510 }
511
512 if (rp) {
513 struct xfrm_replay_state *replay;
514 replay = nla_data(rp);
515 memcpy(&x->replay, replay, sizeof(*replay));
516 memcpy(&x->preplay, replay, sizeof(*replay));
517 }
518
519 if (lt) {
520 struct xfrm_lifetime_cur *ltime;
521 ltime = nla_data(lt);
522 x->curlft.bytes = ltime->bytes;
523 x->curlft.packets = ltime->packets;
524 x->curlft.add_time = ltime->add_time;
525 x->curlft.use_time = ltime->use_time;
526 }
527
528 if (et)
529 x->replay_maxage = nla_get_u32(et);
530
531 if (rt)
532 x->replay_maxdiff = nla_get_u32(rt);
533 }
534
535 static struct xfrm_state *xfrm_state_construct(struct net *net,
536 struct xfrm_usersa_info *p,
537 struct nlattr **attrs,
538 int *errp)
539 {
540 struct xfrm_state *x = xfrm_state_alloc(net);
541 int err = -ENOMEM;
542
543 if (!x)
544 goto error_no_put;
545
546 copy_from_user_state(x, p);
547
548 if (attrs[XFRMA_SA_EXTRA_FLAGS])
549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
550
551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
552 goto error;
553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
554 attrs[XFRMA_ALG_AUTH_TRUNC])))
555 goto error;
556 if (!x->props.aalgo) {
557 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
558 attrs[XFRMA_ALG_AUTH])))
559 goto error;
560 }
561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
562 goto error;
563 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
564 xfrm_calg_get_byname,
565 attrs[XFRMA_ALG_COMP])))
566 goto error;
567
568 if (attrs[XFRMA_ENCAP]) {
569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
570 sizeof(*x->encap), GFP_KERNEL);
571 if (x->encap == NULL)
572 goto error;
573 }
574
575 if (attrs[XFRMA_TFCPAD])
576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
577
578 if (attrs[XFRMA_COADDR]) {
579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
580 sizeof(*x->coaddr), GFP_KERNEL);
581 if (x->coaddr == NULL)
582 goto error;
583 }
584
585 xfrm_mark_get(attrs, &x->mark);
586
587 if (attrs[XFRMA_OUTPUT_MARK])
588 x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]);
589
590 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
591 if (err)
592 goto error;
593
594 if (attrs[XFRMA_SEC_CTX]) {
595 err = security_xfrm_state_alloc(x,
596 nla_data(attrs[XFRMA_SEC_CTX]));
597 if (err)
598 goto error;
599 }
600
601 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
602 attrs[XFRMA_REPLAY_ESN_VAL])))
603 goto error;
604
605 x->km.seq = p->seq;
606 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
607 /* sysctl_xfrm_aevent_etime is in 100ms units */
608 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
609
610 if ((err = xfrm_init_replay(x)))
611 goto error;
612
613 /* override default values from above */
614 xfrm_update_ae_params(x, attrs, 0);
615
616 /* configure the hardware if offload is requested */
617 if (attrs[XFRMA_OFFLOAD_DEV]) {
618 err = xfrm_dev_state_add(net, x,
619 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
620 if (err)
621 goto error;
622 }
623
624 return x;
625
626 error:
627 x->km.state = XFRM_STATE_DEAD;
628 xfrm_state_put(x);
629 error_no_put:
630 *errp = err;
631 return NULL;
632 }
633
634 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
635 struct nlattr **attrs)
636 {
637 struct net *net = sock_net(skb->sk);
638 struct xfrm_usersa_info *p = nlmsg_data(nlh);
639 struct xfrm_state *x;
640 int err;
641 struct km_event c;
642
643 err = verify_newsa_info(p, attrs);
644 if (err)
645 return err;
646
647 x = xfrm_state_construct(net, p, attrs, &err);
648 if (!x)
649 return err;
650
651 xfrm_state_hold(x);
652 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
653 err = xfrm_state_add(x);
654 else
655 err = xfrm_state_update(x);
656
657 xfrm_audit_state_add(x, err ? 0 : 1, true);
658
659 if (err < 0) {
660 x->km.state = XFRM_STATE_DEAD;
661 xfrm_dev_state_delete(x);
662 __xfrm_state_put(x);
663 goto out;
664 }
665
666 if (x->km.state == XFRM_STATE_VOID)
667 x->km.state = XFRM_STATE_VALID;
668
669 c.seq = nlh->nlmsg_seq;
670 c.portid = nlh->nlmsg_pid;
671 c.event = nlh->nlmsg_type;
672
673 km_state_notify(x, &c);
674 out:
675 xfrm_state_put(x);
676 return err;
677 }
678
679 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
680 struct xfrm_usersa_id *p,
681 struct nlattr **attrs,
682 int *errp)
683 {
684 struct xfrm_state *x = NULL;
685 struct xfrm_mark m;
686 int err;
687 u32 mark = xfrm_mark_get(attrs, &m);
688
689 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
690 err = -ESRCH;
691 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
692 } else {
693 xfrm_address_t *saddr = NULL;
694
695 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
696 if (!saddr) {
697 err = -EINVAL;
698 goto out;
699 }
700
701 err = -ESRCH;
702 x = xfrm_state_lookup_byaddr(net, mark,
703 &p->daddr, saddr,
704 p->proto, p->family);
705 }
706
707 out:
708 if (!x && errp)
709 *errp = err;
710 return x;
711 }
712
713 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
714 struct nlattr **attrs)
715 {
716 struct net *net = sock_net(skb->sk);
717 struct xfrm_state *x;
718 int err = -ESRCH;
719 struct km_event c;
720 struct xfrm_usersa_id *p = nlmsg_data(nlh);
721
722 x = xfrm_user_state_lookup(net, p, attrs, &err);
723 if (x == NULL)
724 return err;
725
726 if ((err = security_xfrm_state_delete(x)) != 0)
727 goto out;
728
729 if (xfrm_state_kern(x)) {
730 err = -EPERM;
731 goto out;
732 }
733
734 err = xfrm_state_delete(x);
735
736 if (err < 0)
737 goto out;
738
739 c.seq = nlh->nlmsg_seq;
740 c.portid = nlh->nlmsg_pid;
741 c.event = nlh->nlmsg_type;
742 km_state_notify(x, &c);
743
744 out:
745 xfrm_audit_state_delete(x, err ? 0 : 1, true);
746 xfrm_state_put(x);
747 return err;
748 }
749
750 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
751 {
752 memset(p, 0, sizeof(*p));
753 memcpy(&p->id, &x->id, sizeof(p->id));
754 memcpy(&p->sel, &x->sel, sizeof(p->sel));
755 memcpy(&p->lft, &x->lft, sizeof(p->lft));
756 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
757 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
758 put_unaligned(x->stats.replay, &p->stats.replay);
759 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
760 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
761 p->mode = x->props.mode;
762 p->replay_window = x->props.replay_window;
763 p->reqid = x->props.reqid;
764 p->family = x->props.family;
765 p->flags = x->props.flags;
766 p->seq = x->km.seq;
767 }
768
769 struct xfrm_dump_info {
770 struct sk_buff *in_skb;
771 struct sk_buff *out_skb;
772 u32 nlmsg_seq;
773 u16 nlmsg_flags;
774 };
775
776 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
777 {
778 struct xfrm_user_sec_ctx *uctx;
779 struct nlattr *attr;
780 int ctx_size = sizeof(*uctx) + s->ctx_len;
781
782 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
783 if (attr == NULL)
784 return -EMSGSIZE;
785
786 uctx = nla_data(attr);
787 uctx->exttype = XFRMA_SEC_CTX;
788 uctx->len = ctx_size;
789 uctx->ctx_doi = s->ctx_doi;
790 uctx->ctx_alg = s->ctx_alg;
791 uctx->ctx_len = s->ctx_len;
792 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
793
794 return 0;
795 }
796
797 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
798 {
799 struct xfrm_user_offload *xuo;
800 struct nlattr *attr;
801
802 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
803 if (attr == NULL)
804 return -EMSGSIZE;
805
806 xuo = nla_data(attr);
807 memset(xuo, 0, sizeof(*xuo));
808 xuo->ifindex = xso->dev->ifindex;
809 xuo->flags = xso->flags;
810
811 return 0;
812 }
813
814 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
815 {
816 struct xfrm_algo *algo;
817 struct nlattr *nla;
818
819 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
820 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
821 if (!nla)
822 return -EMSGSIZE;
823
824 algo = nla_data(nla);
825 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
826 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
827 algo->alg_key_len = auth->alg_key_len;
828
829 return 0;
830 }
831
832 /* Don't change this without updating xfrm_sa_len! */
833 static int copy_to_user_state_extra(struct xfrm_state *x,
834 struct xfrm_usersa_info *p,
835 struct sk_buff *skb)
836 {
837 int ret = 0;
838
839 copy_to_user_state(x, p);
840
841 if (x->props.extra_flags) {
842 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
843 x->props.extra_flags);
844 if (ret)
845 goto out;
846 }
847
848 if (x->coaddr) {
849 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
850 if (ret)
851 goto out;
852 }
853 if (x->lastused) {
854 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
855 XFRMA_PAD);
856 if (ret)
857 goto out;
858 }
859 if (x->aead) {
860 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
861 if (ret)
862 goto out;
863 }
864 if (x->aalg) {
865 ret = copy_to_user_auth(x->aalg, skb);
866 if (!ret)
867 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
868 xfrm_alg_auth_len(x->aalg), x->aalg);
869 if (ret)
870 goto out;
871 }
872 if (x->ealg) {
873 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
874 if (ret)
875 goto out;
876 }
877 if (x->calg) {
878 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
879 if (ret)
880 goto out;
881 }
882 if (x->encap) {
883 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
884 if (ret)
885 goto out;
886 }
887 if (x->tfcpad) {
888 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
889 if (ret)
890 goto out;
891 }
892 ret = xfrm_mark_put(skb, &x->mark);
893 if (ret)
894 goto out;
895 if (x->replay_esn)
896 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
897 xfrm_replay_state_esn_len(x->replay_esn),
898 x->replay_esn);
899 else
900 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
901 &x->replay);
902 if (ret)
903 goto out;
904 if(x->xso.dev)
905 ret = copy_user_offload(&x->xso, skb);
906 if (ret)
907 goto out;
908 if (x->props.output_mark) {
909 ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
910 if (ret)
911 goto out;
912 }
913 if (x->security)
914 ret = copy_sec_ctx(x->security, skb);
915 out:
916 return ret;
917 }
918
919 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
920 {
921 struct xfrm_dump_info *sp = ptr;
922 struct sk_buff *in_skb = sp->in_skb;
923 struct sk_buff *skb = sp->out_skb;
924 struct xfrm_usersa_info *p;
925 struct nlmsghdr *nlh;
926 int err;
927
928 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
929 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
930 if (nlh == NULL)
931 return -EMSGSIZE;
932
933 p = nlmsg_data(nlh);
934
935 err = copy_to_user_state_extra(x, p, skb);
936 if (err) {
937 nlmsg_cancel(skb, nlh);
938 return err;
939 }
940 nlmsg_end(skb, nlh);
941 return 0;
942 }
943
944 static int xfrm_dump_sa_done(struct netlink_callback *cb)
945 {
946 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
947 struct sock *sk = cb->skb->sk;
948 struct net *net = sock_net(sk);
949
950 if (cb->args[0])
951 xfrm_state_walk_done(walk, net);
952 return 0;
953 }
954
955 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
956 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
957 {
958 struct net *net = sock_net(skb->sk);
959 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
960 struct xfrm_dump_info info;
961
962 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
963 sizeof(cb->args) - sizeof(cb->args[0]));
964
965 info.in_skb = cb->skb;
966 info.out_skb = skb;
967 info.nlmsg_seq = cb->nlh->nlmsg_seq;
968 info.nlmsg_flags = NLM_F_MULTI;
969
970 if (!cb->args[0]) {
971 struct nlattr *attrs[XFRMA_MAX+1];
972 struct xfrm_address_filter *filter = NULL;
973 u8 proto = 0;
974 int err;
975
976 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
977 NULL);
978 if (err < 0)
979 return err;
980
981 if (attrs[XFRMA_ADDRESS_FILTER]) {
982 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
983 sizeof(*filter), GFP_KERNEL);
984 if (filter == NULL)
985 return -ENOMEM;
986 }
987
988 if (attrs[XFRMA_PROTO])
989 proto = nla_get_u8(attrs[XFRMA_PROTO]);
990
991 xfrm_state_walk_init(walk, proto, filter);
992 cb->args[0] = 1;
993 }
994
995 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
996
997 return skb->len;
998 }
999
1000 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1001 struct xfrm_state *x, u32 seq)
1002 {
1003 struct xfrm_dump_info info;
1004 struct sk_buff *skb;
1005 int err;
1006
1007 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1008 if (!skb)
1009 return ERR_PTR(-ENOMEM);
1010
1011 info.in_skb = in_skb;
1012 info.out_skb = skb;
1013 info.nlmsg_seq = seq;
1014 info.nlmsg_flags = 0;
1015
1016 err = dump_one_state(x, 0, &info);
1017 if (err) {
1018 kfree_skb(skb);
1019 return ERR_PTR(err);
1020 }
1021
1022 return skb;
1023 }
1024
1025 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1026 * Must be called with RCU read lock.
1027 */
1028 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1029 u32 pid, unsigned int group)
1030 {
1031 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1032
1033 if (nlsk)
1034 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1035 else
1036 return -1;
1037 }
1038
1039 static inline unsigned int xfrm_spdinfo_msgsize(void)
1040 {
1041 return NLMSG_ALIGN(4)
1042 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1043 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1044 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1045 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1046 }
1047
1048 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1049 u32 portid, u32 seq, u32 flags)
1050 {
1051 struct xfrmk_spdinfo si;
1052 struct xfrmu_spdinfo spc;
1053 struct xfrmu_spdhinfo sph;
1054 struct xfrmu_spdhthresh spt4, spt6;
1055 struct nlmsghdr *nlh;
1056 int err;
1057 u32 *f;
1058 unsigned lseq;
1059
1060 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1061 if (nlh == NULL) /* shouldn't really happen ... */
1062 return -EMSGSIZE;
1063
1064 f = nlmsg_data(nlh);
1065 *f = flags;
1066 xfrm_spd_getinfo(net, &si);
1067 spc.incnt = si.incnt;
1068 spc.outcnt = si.outcnt;
1069 spc.fwdcnt = si.fwdcnt;
1070 spc.inscnt = si.inscnt;
1071 spc.outscnt = si.outscnt;
1072 spc.fwdscnt = si.fwdscnt;
1073 sph.spdhcnt = si.spdhcnt;
1074 sph.spdhmcnt = si.spdhmcnt;
1075
1076 do {
1077 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1078
1079 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1080 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1081 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1082 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1083 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1084
1085 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1086 if (!err)
1087 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1088 if (!err)
1089 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1090 if (!err)
1091 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1092 if (err) {
1093 nlmsg_cancel(skb, nlh);
1094 return err;
1095 }
1096
1097 nlmsg_end(skb, nlh);
1098 return 0;
1099 }
1100
1101 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1102 struct nlattr **attrs)
1103 {
1104 struct net *net = sock_net(skb->sk);
1105 struct xfrmu_spdhthresh *thresh4 = NULL;
1106 struct xfrmu_spdhthresh *thresh6 = NULL;
1107
1108 /* selector prefixlen thresholds to hash policies */
1109 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1110 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1111
1112 if (nla_len(rta) < sizeof(*thresh4))
1113 return -EINVAL;
1114 thresh4 = nla_data(rta);
1115 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1116 return -EINVAL;
1117 }
1118 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1119 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1120
1121 if (nla_len(rta) < sizeof(*thresh6))
1122 return -EINVAL;
1123 thresh6 = nla_data(rta);
1124 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1125 return -EINVAL;
1126 }
1127
1128 if (thresh4 || thresh6) {
1129 write_seqlock(&net->xfrm.policy_hthresh.lock);
1130 if (thresh4) {
1131 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1132 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1133 }
1134 if (thresh6) {
1135 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1136 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1137 }
1138 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1139
1140 xfrm_policy_hash_rebuild(net);
1141 }
1142
1143 return 0;
1144 }
1145
1146 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1147 struct nlattr **attrs)
1148 {
1149 struct net *net = sock_net(skb->sk);
1150 struct sk_buff *r_skb;
1151 u32 *flags = nlmsg_data(nlh);
1152 u32 sportid = NETLINK_CB(skb).portid;
1153 u32 seq = nlh->nlmsg_seq;
1154 int err;
1155
1156 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1157 if (r_skb == NULL)
1158 return -ENOMEM;
1159
1160 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1161 BUG_ON(err < 0);
1162
1163 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1164 }
1165
1166 static inline unsigned int xfrm_sadinfo_msgsize(void)
1167 {
1168 return NLMSG_ALIGN(4)
1169 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1170 + nla_total_size(4); /* XFRMA_SAD_CNT */
1171 }
1172
1173 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1174 u32 portid, u32 seq, u32 flags)
1175 {
1176 struct xfrmk_sadinfo si;
1177 struct xfrmu_sadhinfo sh;
1178 struct nlmsghdr *nlh;
1179 int err;
1180 u32 *f;
1181
1182 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1183 if (nlh == NULL) /* shouldn't really happen ... */
1184 return -EMSGSIZE;
1185
1186 f = nlmsg_data(nlh);
1187 *f = flags;
1188 xfrm_sad_getinfo(net, &si);
1189
1190 sh.sadhmcnt = si.sadhmcnt;
1191 sh.sadhcnt = si.sadhcnt;
1192
1193 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1194 if (!err)
1195 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1196 if (err) {
1197 nlmsg_cancel(skb, nlh);
1198 return err;
1199 }
1200
1201 nlmsg_end(skb, nlh);
1202 return 0;
1203 }
1204
1205 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1206 struct nlattr **attrs)
1207 {
1208 struct net *net = sock_net(skb->sk);
1209 struct sk_buff *r_skb;
1210 u32 *flags = nlmsg_data(nlh);
1211 u32 sportid = NETLINK_CB(skb).portid;
1212 u32 seq = nlh->nlmsg_seq;
1213 int err;
1214
1215 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1216 if (r_skb == NULL)
1217 return -ENOMEM;
1218
1219 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1220 BUG_ON(err < 0);
1221
1222 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1223 }
1224
1225 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1226 struct nlattr **attrs)
1227 {
1228 struct net *net = sock_net(skb->sk);
1229 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1230 struct xfrm_state *x;
1231 struct sk_buff *resp_skb;
1232 int err = -ESRCH;
1233
1234 x = xfrm_user_state_lookup(net, p, attrs, &err);
1235 if (x == NULL)
1236 goto out_noput;
1237
1238 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1239 if (IS_ERR(resp_skb)) {
1240 err = PTR_ERR(resp_skb);
1241 } else {
1242 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1243 }
1244 xfrm_state_put(x);
1245 out_noput:
1246 return err;
1247 }
1248
1249 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1250 struct nlattr **attrs)
1251 {
1252 struct net *net = sock_net(skb->sk);
1253 struct xfrm_state *x;
1254 struct xfrm_userspi_info *p;
1255 struct sk_buff *resp_skb;
1256 xfrm_address_t *daddr;
1257 int family;
1258 int err;
1259 u32 mark;
1260 struct xfrm_mark m;
1261
1262 p = nlmsg_data(nlh);
1263 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1264 if (err)
1265 goto out_noput;
1266
1267 family = p->info.family;
1268 daddr = &p->info.id.daddr;
1269
1270 x = NULL;
1271
1272 mark = xfrm_mark_get(attrs, &m);
1273 if (p->info.seq) {
1274 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1275 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1276 xfrm_state_put(x);
1277 x = NULL;
1278 }
1279 }
1280
1281 if (!x)
1282 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1283 p->info.id.proto, daddr,
1284 &p->info.saddr, 1,
1285 family);
1286 err = -ENOENT;
1287 if (x == NULL)
1288 goto out_noput;
1289
1290 err = xfrm_alloc_spi(x, p->min, p->max);
1291 if (err)
1292 goto out;
1293
1294 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1295 if (IS_ERR(resp_skb)) {
1296 err = PTR_ERR(resp_skb);
1297 goto out;
1298 }
1299
1300 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1301
1302 out:
1303 xfrm_state_put(x);
1304 out_noput:
1305 return err;
1306 }
1307
1308 static int verify_policy_dir(u8 dir)
1309 {
1310 switch (dir) {
1311 case XFRM_POLICY_IN:
1312 case XFRM_POLICY_OUT:
1313 case XFRM_POLICY_FWD:
1314 break;
1315
1316 default:
1317 return -EINVAL;
1318 }
1319
1320 return 0;
1321 }
1322
1323 static int verify_policy_type(u8 type)
1324 {
1325 switch (type) {
1326 case XFRM_POLICY_TYPE_MAIN:
1327 #ifdef CONFIG_XFRM_SUB_POLICY
1328 case XFRM_POLICY_TYPE_SUB:
1329 #endif
1330 break;
1331
1332 default:
1333 return -EINVAL;
1334 }
1335
1336 return 0;
1337 }
1338
1339 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1340 {
1341 int ret;
1342
1343 switch (p->share) {
1344 case XFRM_SHARE_ANY:
1345 case XFRM_SHARE_SESSION:
1346 case XFRM_SHARE_USER:
1347 case XFRM_SHARE_UNIQUE:
1348 break;
1349
1350 default:
1351 return -EINVAL;
1352 }
1353
1354 switch (p->action) {
1355 case XFRM_POLICY_ALLOW:
1356 case XFRM_POLICY_BLOCK:
1357 break;
1358
1359 default:
1360 return -EINVAL;
1361 }
1362
1363 switch (p->sel.family) {
1364 case AF_INET:
1365 break;
1366
1367 case AF_INET6:
1368 #if IS_ENABLED(CONFIG_IPV6)
1369 break;
1370 #else
1371 return -EAFNOSUPPORT;
1372 #endif
1373
1374 default:
1375 return -EINVAL;
1376 }
1377
1378 ret = verify_policy_dir(p->dir);
1379 if (ret)
1380 return ret;
1381 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1382 return -EINVAL;
1383
1384 return 0;
1385 }
1386
1387 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1388 {
1389 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1390 struct xfrm_user_sec_ctx *uctx;
1391
1392 if (!rt)
1393 return 0;
1394
1395 uctx = nla_data(rt);
1396 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1397 }
1398
1399 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1400 int nr)
1401 {
1402 int i;
1403
1404 xp->xfrm_nr = nr;
1405 for (i = 0; i < nr; i++, ut++) {
1406 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1407
1408 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1409 memcpy(&t->saddr, &ut->saddr,
1410 sizeof(xfrm_address_t));
1411 t->reqid = ut->reqid;
1412 t->mode = ut->mode;
1413 t->share = ut->share;
1414 t->optional = ut->optional;
1415 t->aalgos = ut->aalgos;
1416 t->ealgos = ut->ealgos;
1417 t->calgos = ut->calgos;
1418 /* If all masks are ~0, then we allow all algorithms. */
1419 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1420 t->encap_family = ut->family;
1421 }
1422 }
1423
1424 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1425 {
1426 u16 prev_family;
1427 int i;
1428
1429 if (nr > XFRM_MAX_DEPTH)
1430 return -EINVAL;
1431
1432 prev_family = family;
1433
1434 for (i = 0; i < nr; i++) {
1435 /* We never validated the ut->family value, so many
1436 * applications simply leave it at zero. The check was
1437 * never made and ut->family was ignored because all
1438 * templates could be assumed to have the same family as
1439 * the policy itself. Now that we will have ipv4-in-ipv6
1440 * and ipv6-in-ipv4 tunnels, this is no longer true.
1441 */
1442 if (!ut[i].family)
1443 ut[i].family = family;
1444
1445 if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
1446 (ut[i].family != prev_family))
1447 return -EINVAL;
1448
1449 prev_family = ut[i].family;
1450
1451 switch (ut[i].family) {
1452 case AF_INET:
1453 break;
1454 #if IS_ENABLED(CONFIG_IPV6)
1455 case AF_INET6:
1456 break;
1457 #endif
1458 default:
1459 return -EINVAL;
1460 }
1461
1462 switch (ut[i].id.proto) {
1463 case IPPROTO_AH:
1464 case IPPROTO_ESP:
1465 case IPPROTO_COMP:
1466 #if IS_ENABLED(CONFIG_IPV6)
1467 case IPPROTO_ROUTING:
1468 case IPPROTO_DSTOPTS:
1469 #endif
1470 case IPSEC_PROTO_ANY:
1471 break;
1472 default:
1473 return -EINVAL;
1474 }
1475
1476 }
1477
1478 return 0;
1479 }
1480
1481 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1482 {
1483 struct nlattr *rt = attrs[XFRMA_TMPL];
1484
1485 if (!rt) {
1486 pol->xfrm_nr = 0;
1487 } else {
1488 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1489 int nr = nla_len(rt) / sizeof(*utmpl);
1490 int err;
1491
1492 err = validate_tmpl(nr, utmpl, pol->family);
1493 if (err)
1494 return err;
1495
1496 copy_templates(pol, utmpl, nr);
1497 }
1498 return 0;
1499 }
1500
1501 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1502 {
1503 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1504 struct xfrm_userpolicy_type *upt;
1505 u8 type = XFRM_POLICY_TYPE_MAIN;
1506 int err;
1507
1508 if (rt) {
1509 upt = nla_data(rt);
1510 type = upt->type;
1511 }
1512
1513 err = verify_policy_type(type);
1514 if (err)
1515 return err;
1516
1517 *tp = type;
1518 return 0;
1519 }
1520
1521 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1522 {
1523 xp->priority = p->priority;
1524 xp->index = p->index;
1525 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1526 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1527 xp->action = p->action;
1528 xp->flags = p->flags;
1529 xp->family = p->sel.family;
1530 /* XXX xp->share = p->share; */
1531 }
1532
1533 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1534 {
1535 memset(p, 0, sizeof(*p));
1536 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1537 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1538 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1539 p->priority = xp->priority;
1540 p->index = xp->index;
1541 p->sel.family = xp->family;
1542 p->dir = dir;
1543 p->action = xp->action;
1544 p->flags = xp->flags;
1545 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1546 }
1547
1548 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1549 {
1550 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1551 int err;
1552
1553 if (!xp) {
1554 *errp = -ENOMEM;
1555 return NULL;
1556 }
1557
1558 copy_from_user_policy(xp, p);
1559
1560 err = copy_from_user_policy_type(&xp->type, attrs);
1561 if (err)
1562 goto error;
1563
1564 if (!(err = copy_from_user_tmpl(xp, attrs)))
1565 err = copy_from_user_sec_ctx(xp, attrs);
1566 if (err)
1567 goto error;
1568
1569 xfrm_mark_get(attrs, &xp->mark);
1570
1571 return xp;
1572 error:
1573 *errp = err;
1574 xp->walk.dead = 1;
1575 xfrm_policy_destroy(xp);
1576 return NULL;
1577 }
1578
1579 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1580 struct nlattr **attrs)
1581 {
1582 struct net *net = sock_net(skb->sk);
1583 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1584 struct xfrm_policy *xp;
1585 struct km_event c;
1586 int err;
1587 int excl;
1588
1589 err = verify_newpolicy_info(p);
1590 if (err)
1591 return err;
1592 err = verify_sec_ctx_len(attrs);
1593 if (err)
1594 return err;
1595
1596 xp = xfrm_policy_construct(net, p, attrs, &err);
1597 if (!xp)
1598 return err;
1599
1600 /* shouldn't excl be based on nlh flags??
1601 * Aha! this is anti-netlink really i.e more pfkey derived
1602 * in netlink excl is a flag and you wouldnt need
1603 * a type XFRM_MSG_UPDPOLICY - JHS */
1604 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1605 err = xfrm_policy_insert(p->dir, xp, excl);
1606 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1607
1608 if (err) {
1609 security_xfrm_policy_free(xp->security);
1610 kfree(xp);
1611 return err;
1612 }
1613
1614 c.event = nlh->nlmsg_type;
1615 c.seq = nlh->nlmsg_seq;
1616 c.portid = nlh->nlmsg_pid;
1617 km_policy_notify(xp, p->dir, &c);
1618
1619 xfrm_pol_put(xp);
1620
1621 return 0;
1622 }
1623
1624 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1625 {
1626 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1627 int i;
1628
1629 if (xp->xfrm_nr == 0)
1630 return 0;
1631
1632 for (i = 0; i < xp->xfrm_nr; i++) {
1633 struct xfrm_user_tmpl *up = &vec[i];
1634 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1635
1636 memset(up, 0, sizeof(*up));
1637 memcpy(&up->id, &kp->id, sizeof(up->id));
1638 up->family = kp->encap_family;
1639 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1640 up->reqid = kp->reqid;
1641 up->mode = kp->mode;
1642 up->share = kp->share;
1643 up->optional = kp->optional;
1644 up->aalgos = kp->aalgos;
1645 up->ealgos = kp->ealgos;
1646 up->calgos = kp->calgos;
1647 }
1648
1649 return nla_put(skb, XFRMA_TMPL,
1650 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1651 }
1652
1653 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1654 {
1655 if (x->security) {
1656 return copy_sec_ctx(x->security, skb);
1657 }
1658 return 0;
1659 }
1660
1661 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1662 {
1663 if (xp->security)
1664 return copy_sec_ctx(xp->security, skb);
1665 return 0;
1666 }
1667 static inline unsigned int userpolicy_type_attrsize(void)
1668 {
1669 #ifdef CONFIG_XFRM_SUB_POLICY
1670 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1671 #else
1672 return 0;
1673 #endif
1674 }
1675
1676 #ifdef CONFIG_XFRM_SUB_POLICY
1677 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1678 {
1679 struct xfrm_userpolicy_type upt = {
1680 .type = type,
1681 };
1682
1683 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1684 }
1685
1686 #else
1687 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1688 {
1689 return 0;
1690 }
1691 #endif
1692
1693 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1694 {
1695 struct xfrm_dump_info *sp = ptr;
1696 struct xfrm_userpolicy_info *p;
1697 struct sk_buff *in_skb = sp->in_skb;
1698 struct sk_buff *skb = sp->out_skb;
1699 struct nlmsghdr *nlh;
1700 int err;
1701
1702 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1703 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1704 if (nlh == NULL)
1705 return -EMSGSIZE;
1706
1707 p = nlmsg_data(nlh);
1708 copy_to_user_policy(xp, p, dir);
1709 err = copy_to_user_tmpl(xp, skb);
1710 if (!err)
1711 err = copy_to_user_sec_ctx(xp, skb);
1712 if (!err)
1713 err = copy_to_user_policy_type(xp->type, skb);
1714 if (!err)
1715 err = xfrm_mark_put(skb, &xp->mark);
1716 if (err) {
1717 nlmsg_cancel(skb, nlh);
1718 return err;
1719 }
1720 nlmsg_end(skb, nlh);
1721 return 0;
1722 }
1723
1724 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1725 {
1726 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1727 struct net *net = sock_net(cb->skb->sk);
1728
1729 xfrm_policy_walk_done(walk, net);
1730 return 0;
1731 }
1732
1733 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1734 {
1735 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1736
1737 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1738
1739 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1740 return 0;
1741 }
1742
1743 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1744 {
1745 struct net *net = sock_net(skb->sk);
1746 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1747 struct xfrm_dump_info info;
1748
1749 info.in_skb = cb->skb;
1750 info.out_skb = skb;
1751 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1752 info.nlmsg_flags = NLM_F_MULTI;
1753
1754 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1755
1756 return skb->len;
1757 }
1758
1759 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1760 struct xfrm_policy *xp,
1761 int dir, u32 seq)
1762 {
1763 struct xfrm_dump_info info;
1764 struct sk_buff *skb;
1765 int err;
1766
1767 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1768 if (!skb)
1769 return ERR_PTR(-ENOMEM);
1770
1771 info.in_skb = in_skb;
1772 info.out_skb = skb;
1773 info.nlmsg_seq = seq;
1774 info.nlmsg_flags = 0;
1775
1776 err = dump_one_policy(xp, dir, 0, &info);
1777 if (err) {
1778 kfree_skb(skb);
1779 return ERR_PTR(err);
1780 }
1781
1782 return skb;
1783 }
1784
1785 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1786 struct nlattr **attrs)
1787 {
1788 struct net *net = sock_net(skb->sk);
1789 struct xfrm_policy *xp;
1790 struct xfrm_userpolicy_id *p;
1791 u8 type = XFRM_POLICY_TYPE_MAIN;
1792 int err;
1793 struct km_event c;
1794 int delete;
1795 struct xfrm_mark m;
1796 u32 mark = xfrm_mark_get(attrs, &m);
1797
1798 p = nlmsg_data(nlh);
1799 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1800
1801 err = copy_from_user_policy_type(&type, attrs);
1802 if (err)
1803 return err;
1804
1805 err = verify_policy_dir(p->dir);
1806 if (err)
1807 return err;
1808
1809 if (p->index)
1810 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1811 else {
1812 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1813 struct xfrm_sec_ctx *ctx;
1814
1815 err = verify_sec_ctx_len(attrs);
1816 if (err)
1817 return err;
1818
1819 ctx = NULL;
1820 if (rt) {
1821 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1822
1823 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1824 if (err)
1825 return err;
1826 }
1827 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1828 ctx, delete, &err);
1829 security_xfrm_policy_free(ctx);
1830 }
1831 if (xp == NULL)
1832 return -ENOENT;
1833
1834 if (!delete) {
1835 struct sk_buff *resp_skb;
1836
1837 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1838 if (IS_ERR(resp_skb)) {
1839 err = PTR_ERR(resp_skb);
1840 } else {
1841 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1842 NETLINK_CB(skb).portid);
1843 }
1844 } else {
1845 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1846
1847 if (err != 0)
1848 goto out;
1849
1850 c.data.byid = p->index;
1851 c.event = nlh->nlmsg_type;
1852 c.seq = nlh->nlmsg_seq;
1853 c.portid = nlh->nlmsg_pid;
1854 km_policy_notify(xp, p->dir, &c);
1855 }
1856
1857 out:
1858 xfrm_pol_put(xp);
1859 return err;
1860 }
1861
1862 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1863 struct nlattr **attrs)
1864 {
1865 struct net *net = sock_net(skb->sk);
1866 struct km_event c;
1867 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1868 int err;
1869
1870 err = xfrm_state_flush(net, p->proto, true);
1871 if (err) {
1872 if (err == -ESRCH) /* empty table */
1873 return 0;
1874 return err;
1875 }
1876 c.data.proto = p->proto;
1877 c.event = nlh->nlmsg_type;
1878 c.seq = nlh->nlmsg_seq;
1879 c.portid = nlh->nlmsg_pid;
1880 c.net = net;
1881 km_state_notify(NULL, &c);
1882
1883 return 0;
1884 }
1885
1886 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1887 {
1888 unsigned int replay_size = x->replay_esn ?
1889 xfrm_replay_state_esn_len(x->replay_esn) :
1890 sizeof(struct xfrm_replay_state);
1891
1892 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1893 + nla_total_size(replay_size)
1894 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1895 + nla_total_size(sizeof(struct xfrm_mark))
1896 + nla_total_size(4) /* XFRM_AE_RTHR */
1897 + nla_total_size(4); /* XFRM_AE_ETHR */
1898 }
1899
1900 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1901 {
1902 struct xfrm_aevent_id *id;
1903 struct nlmsghdr *nlh;
1904 int err;
1905
1906 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1907 if (nlh == NULL)
1908 return -EMSGSIZE;
1909
1910 id = nlmsg_data(nlh);
1911 memset(&id->sa_id, 0, sizeof(id->sa_id));
1912 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1913 id->sa_id.spi = x->id.spi;
1914 id->sa_id.family = x->props.family;
1915 id->sa_id.proto = x->id.proto;
1916 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1917 id->reqid = x->props.reqid;
1918 id->flags = c->data.aevent;
1919
1920 if (x->replay_esn) {
1921 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1922 xfrm_replay_state_esn_len(x->replay_esn),
1923 x->replay_esn);
1924 } else {
1925 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1926 &x->replay);
1927 }
1928 if (err)
1929 goto out_cancel;
1930 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1931 XFRMA_PAD);
1932 if (err)
1933 goto out_cancel;
1934
1935 if (id->flags & XFRM_AE_RTHR) {
1936 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1937 if (err)
1938 goto out_cancel;
1939 }
1940 if (id->flags & XFRM_AE_ETHR) {
1941 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1942 x->replay_maxage * 10 / HZ);
1943 if (err)
1944 goto out_cancel;
1945 }
1946 err = xfrm_mark_put(skb, &x->mark);
1947 if (err)
1948 goto out_cancel;
1949
1950 nlmsg_end(skb, nlh);
1951 return 0;
1952
1953 out_cancel:
1954 nlmsg_cancel(skb, nlh);
1955 return err;
1956 }
1957
1958 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1959 struct nlattr **attrs)
1960 {
1961 struct net *net = sock_net(skb->sk);
1962 struct xfrm_state *x;
1963 struct sk_buff *r_skb;
1964 int err;
1965 struct km_event c;
1966 u32 mark;
1967 struct xfrm_mark m;
1968 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1969 struct xfrm_usersa_id *id = &p->sa_id;
1970
1971 mark = xfrm_mark_get(attrs, &m);
1972
1973 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1974 if (x == NULL)
1975 return -ESRCH;
1976
1977 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1978 if (r_skb == NULL) {
1979 xfrm_state_put(x);
1980 return -ENOMEM;
1981 }
1982
1983 /*
1984 * XXX: is this lock really needed - none of the other
1985 * gets lock (the concern is things getting updated
1986 * while we are still reading) - jhs
1987 */
1988 spin_lock_bh(&x->lock);
1989 c.data.aevent = p->flags;
1990 c.seq = nlh->nlmsg_seq;
1991 c.portid = nlh->nlmsg_pid;
1992
1993 err = build_aevent(r_skb, x, &c);
1994 BUG_ON(err < 0);
1995
1996 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1997 spin_unlock_bh(&x->lock);
1998 xfrm_state_put(x);
1999 return err;
2000 }
2001
2002 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2003 struct nlattr **attrs)
2004 {
2005 struct net *net = sock_net(skb->sk);
2006 struct xfrm_state *x;
2007 struct km_event c;
2008 int err = -EINVAL;
2009 u32 mark = 0;
2010 struct xfrm_mark m;
2011 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2012 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2013 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2014 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2015 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2016 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2017
2018 if (!lt && !rp && !re && !et && !rt)
2019 return err;
2020
2021 /* pedantic mode - thou shalt sayeth replaceth */
2022 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2023 return err;
2024
2025 mark = xfrm_mark_get(attrs, &m);
2026
2027 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2028 if (x == NULL)
2029 return -ESRCH;
2030
2031 if (x->km.state != XFRM_STATE_VALID)
2032 goto out;
2033
2034 err = xfrm_replay_verify_len(x->replay_esn, re);
2035 if (err)
2036 goto out;
2037
2038 spin_lock_bh(&x->lock);
2039 xfrm_update_ae_params(x, attrs, 1);
2040 spin_unlock_bh(&x->lock);
2041
2042 c.event = nlh->nlmsg_type;
2043 c.seq = nlh->nlmsg_seq;
2044 c.portid = nlh->nlmsg_pid;
2045 c.data.aevent = XFRM_AE_CU;
2046 km_state_notify(x, &c);
2047 err = 0;
2048 out:
2049 xfrm_state_put(x);
2050 return err;
2051 }
2052
2053 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2054 struct nlattr **attrs)
2055 {
2056 struct net *net = sock_net(skb->sk);
2057 struct km_event c;
2058 u8 type = XFRM_POLICY_TYPE_MAIN;
2059 int err;
2060
2061 err = copy_from_user_policy_type(&type, attrs);
2062 if (err)
2063 return err;
2064
2065 err = xfrm_policy_flush(net, type, true);
2066 if (err) {
2067 if (err == -ESRCH) /* empty table */
2068 return 0;
2069 return err;
2070 }
2071
2072 c.data.type = type;
2073 c.event = nlh->nlmsg_type;
2074 c.seq = nlh->nlmsg_seq;
2075 c.portid = nlh->nlmsg_pid;
2076 c.net = net;
2077 km_policy_notify(NULL, 0, &c);
2078 return 0;
2079 }
2080
2081 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2082 struct nlattr **attrs)
2083 {
2084 struct net *net = sock_net(skb->sk);
2085 struct xfrm_policy *xp;
2086 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2087 struct xfrm_userpolicy_info *p = &up->pol;
2088 u8 type = XFRM_POLICY_TYPE_MAIN;
2089 int err = -ENOENT;
2090 struct xfrm_mark m;
2091 u32 mark = xfrm_mark_get(attrs, &m);
2092
2093 err = copy_from_user_policy_type(&type, attrs);
2094 if (err)
2095 return err;
2096
2097 err = verify_policy_dir(p->dir);
2098 if (err)
2099 return err;
2100
2101 if (p->index)
2102 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2103 else {
2104 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2105 struct xfrm_sec_ctx *ctx;
2106
2107 err = verify_sec_ctx_len(attrs);
2108 if (err)
2109 return err;
2110
2111 ctx = NULL;
2112 if (rt) {
2113 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2114
2115 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2116 if (err)
2117 return err;
2118 }
2119 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2120 &p->sel, ctx, 0, &err);
2121 security_xfrm_policy_free(ctx);
2122 }
2123 if (xp == NULL)
2124 return -ENOENT;
2125
2126 if (unlikely(xp->walk.dead))
2127 goto out;
2128
2129 err = 0;
2130 if (up->hard) {
2131 xfrm_policy_delete(xp, p->dir);
2132 xfrm_audit_policy_delete(xp, 1, true);
2133 }
2134 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2135
2136 out:
2137 xfrm_pol_put(xp);
2138 return err;
2139 }
2140
2141 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2142 struct nlattr **attrs)
2143 {
2144 struct net *net = sock_net(skb->sk);
2145 struct xfrm_state *x;
2146 int err;
2147 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2148 struct xfrm_usersa_info *p = &ue->state;
2149 struct xfrm_mark m;
2150 u32 mark = xfrm_mark_get(attrs, &m);
2151
2152 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2153
2154 err = -ENOENT;
2155 if (x == NULL)
2156 return err;
2157
2158 spin_lock_bh(&x->lock);
2159 err = -EINVAL;
2160 if (x->km.state != XFRM_STATE_VALID)
2161 goto out;
2162 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2163
2164 if (ue->hard) {
2165 __xfrm_state_delete(x);
2166 xfrm_audit_state_delete(x, 1, true);
2167 }
2168 err = 0;
2169 out:
2170 spin_unlock_bh(&x->lock);
2171 xfrm_state_put(x);
2172 return err;
2173 }
2174
2175 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2176 struct nlattr **attrs)
2177 {
2178 struct net *net = sock_net(skb->sk);
2179 struct xfrm_policy *xp;
2180 struct xfrm_user_tmpl *ut;
2181 int i;
2182 struct nlattr *rt = attrs[XFRMA_TMPL];
2183 struct xfrm_mark mark;
2184
2185 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2186 struct xfrm_state *x = xfrm_state_alloc(net);
2187 int err = -ENOMEM;
2188
2189 if (!x)
2190 goto nomem;
2191
2192 xfrm_mark_get(attrs, &mark);
2193
2194 err = verify_newpolicy_info(&ua->policy);
2195 if (err)
2196 goto free_state;
2197
2198 /* build an XP */
2199 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2200 if (!xp)
2201 goto free_state;
2202
2203 memcpy(&x->id, &ua->id, sizeof(ua->id));
2204 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2205 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2206 xp->mark.m = x->mark.m = mark.m;
2207 xp->mark.v = x->mark.v = mark.v;
2208 ut = nla_data(rt);
2209 /* extract the templates and for each call km_key */
2210 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2211 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2212 memcpy(&x->id, &t->id, sizeof(x->id));
2213 x->props.mode = t->mode;
2214 x->props.reqid = t->reqid;
2215 x->props.family = ut->family;
2216 t->aalgos = ua->aalgos;
2217 t->ealgos = ua->ealgos;
2218 t->calgos = ua->calgos;
2219 err = km_query(x, t, xp);
2220
2221 }
2222
2223 kfree(x);
2224 kfree(xp);
2225
2226 return 0;
2227
2228 free_state:
2229 kfree(x);
2230 nomem:
2231 return err;
2232 }
2233
2234 #ifdef CONFIG_XFRM_MIGRATE
2235 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2236 struct xfrm_kmaddress *k,
2237 struct nlattr **attrs, int *num)
2238 {
2239 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2240 struct xfrm_user_migrate *um;
2241 int i, num_migrate;
2242
2243 if (k != NULL) {
2244 struct xfrm_user_kmaddress *uk;
2245
2246 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2247 memcpy(&k->local, &uk->local, sizeof(k->local));
2248 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2249 k->family = uk->family;
2250 k->reserved = uk->reserved;
2251 }
2252
2253 um = nla_data(rt);
2254 num_migrate = nla_len(rt) / sizeof(*um);
2255
2256 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2257 return -EINVAL;
2258
2259 for (i = 0; i < num_migrate; i++, um++, ma++) {
2260 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2261 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2262 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2263 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2264
2265 ma->proto = um->proto;
2266 ma->mode = um->mode;
2267 ma->reqid = um->reqid;
2268
2269 ma->old_family = um->old_family;
2270 ma->new_family = um->new_family;
2271 }
2272
2273 *num = i;
2274 return 0;
2275 }
2276
2277 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2278 struct nlattr **attrs)
2279 {
2280 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2281 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2282 struct xfrm_kmaddress km, *kmp;
2283 u8 type;
2284 int err;
2285 int n = 0;
2286 struct net *net = sock_net(skb->sk);
2287 struct xfrm_encap_tmpl *encap = NULL;
2288
2289 if (attrs[XFRMA_MIGRATE] == NULL)
2290 return -EINVAL;
2291
2292 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2293
2294 err = copy_from_user_policy_type(&type, attrs);
2295 if (err)
2296 return err;
2297
2298 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2299 if (err)
2300 return err;
2301
2302 if (!n)
2303 return 0;
2304
2305 if (attrs[XFRMA_ENCAP]) {
2306 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2307 sizeof(*encap), GFP_KERNEL);
2308 if (!encap)
2309 return 0;
2310 }
2311
2312 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2313
2314 kfree(encap);
2315
2316 return err;
2317 }
2318 #else
2319 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2320 struct nlattr **attrs)
2321 {
2322 return -ENOPROTOOPT;
2323 }
2324 #endif
2325
2326 #ifdef CONFIG_XFRM_MIGRATE
2327 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2328 {
2329 struct xfrm_user_migrate um;
2330
2331 memset(&um, 0, sizeof(um));
2332 um.proto = m->proto;
2333 um.mode = m->mode;
2334 um.reqid = m->reqid;
2335 um.old_family = m->old_family;
2336 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2337 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2338 um.new_family = m->new_family;
2339 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2340 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2341
2342 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2343 }
2344
2345 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2346 {
2347 struct xfrm_user_kmaddress uk;
2348
2349 memset(&uk, 0, sizeof(uk));
2350 uk.family = k->family;
2351 uk.reserved = k->reserved;
2352 memcpy(&uk.local, &k->local, sizeof(uk.local));
2353 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2354
2355 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2356 }
2357
2358 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2359 int with_encp)
2360 {
2361 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2362 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2363 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2364 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2365 + userpolicy_type_attrsize();
2366 }
2367
2368 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2369 int num_migrate, const struct xfrm_kmaddress *k,
2370 const struct xfrm_selector *sel,
2371 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2372 {
2373 const struct xfrm_migrate *mp;
2374 struct xfrm_userpolicy_id *pol_id;
2375 struct nlmsghdr *nlh;
2376 int i, err;
2377
2378 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2379 if (nlh == NULL)
2380 return -EMSGSIZE;
2381
2382 pol_id = nlmsg_data(nlh);
2383 /* copy data from selector, dir, and type to the pol_id */
2384 memset(pol_id, 0, sizeof(*pol_id));
2385 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2386 pol_id->dir = dir;
2387
2388 if (k != NULL) {
2389 err = copy_to_user_kmaddress(k, skb);
2390 if (err)
2391 goto out_cancel;
2392 }
2393 if (encap) {
2394 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2395 if (err)
2396 goto out_cancel;
2397 }
2398 err = copy_to_user_policy_type(type, skb);
2399 if (err)
2400 goto out_cancel;
2401 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2402 err = copy_to_user_migrate(mp, skb);
2403 if (err)
2404 goto out_cancel;
2405 }
2406
2407 nlmsg_end(skb, nlh);
2408 return 0;
2409
2410 out_cancel:
2411 nlmsg_cancel(skb, nlh);
2412 return err;
2413 }
2414
2415 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2416 const struct xfrm_migrate *m, int num_migrate,
2417 const struct xfrm_kmaddress *k,
2418 const struct xfrm_encap_tmpl *encap)
2419 {
2420 struct net *net = &init_net;
2421 struct sk_buff *skb;
2422 int err;
2423
2424 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2425 GFP_ATOMIC);
2426 if (skb == NULL)
2427 return -ENOMEM;
2428
2429 /* build migrate */
2430 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2431 BUG_ON(err < 0);
2432
2433 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2434 }
2435 #else
2436 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2437 const struct xfrm_migrate *m, int num_migrate,
2438 const struct xfrm_kmaddress *k,
2439 const struct xfrm_encap_tmpl *encap)
2440 {
2441 return -ENOPROTOOPT;
2442 }
2443 #endif
2444
2445 #define XMSGSIZE(type) sizeof(struct type)
2446
2447 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2448 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2449 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2450 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2451 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2452 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2453 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2454 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2455 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2456 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2457 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2458 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2459 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2460 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2461 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2462 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2463 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2464 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2465 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2466 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2467 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2468 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2469 };
2470
2471 #undef XMSGSIZE
2472
2473 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2474 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2475 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2476 [XFRMA_LASTUSED] = { .type = NLA_U64},
2477 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2478 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2479 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2480 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2481 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2482 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2483 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2484 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2485 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2486 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2487 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2488 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2489 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2490 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2491 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2492 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2493 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2494 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2495 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2496 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2497 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2498 [XFRMA_PROTO] = { .type = NLA_U8 },
2499 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2500 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2501 [XFRMA_OUTPUT_MARK] = { .type = NLA_U32 },
2502 };
2503
2504 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2505 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2506 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2507 };
2508
2509 static const struct xfrm_link {
2510 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2511 int (*start)(struct netlink_callback *);
2512 int (*dump)(struct sk_buff *, struct netlink_callback *);
2513 int (*done)(struct netlink_callback *);
2514 const struct nla_policy *nla_pol;
2515 int nla_max;
2516 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2517 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2518 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2519 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2520 .dump = xfrm_dump_sa,
2521 .done = xfrm_dump_sa_done },
2522 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2523 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2524 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2525 .start = xfrm_dump_policy_start,
2526 .dump = xfrm_dump_policy,
2527 .done = xfrm_dump_policy_done },
2528 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2529 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2530 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2531 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2532 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2533 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2534 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2535 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2536 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2537 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2538 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2539 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2540 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2541 .nla_pol = xfrma_spd_policy,
2542 .nla_max = XFRMA_SPD_MAX },
2543 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2544 };
2545
2546 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2547 struct netlink_ext_ack *extack)
2548 {
2549 struct net *net = sock_net(skb->sk);
2550 struct nlattr *attrs[XFRMA_MAX+1];
2551 const struct xfrm_link *link;
2552 int type, err;
2553
2554 #ifdef CONFIG_COMPAT
2555 if (in_compat_syscall())
2556 return -EOPNOTSUPP;
2557 #endif
2558
2559 type = nlh->nlmsg_type;
2560 if (type > XFRM_MSG_MAX)
2561 return -EINVAL;
2562
2563 type -= XFRM_MSG_BASE;
2564 link = &xfrm_dispatch[type];
2565
2566 /* All operations require privileges, even GET */
2567 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2568 return -EPERM;
2569
2570 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2571 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2572 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2573 if (link->dump == NULL)
2574 return -EINVAL;
2575
2576 {
2577 struct netlink_dump_control c = {
2578 .start = link->start,
2579 .dump = link->dump,
2580 .done = link->done,
2581 };
2582 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2583 }
2584 }
2585
2586 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2587 link->nla_max ? : XFRMA_MAX,
2588 link->nla_pol ? : xfrma_policy, extack);
2589 if (err < 0)
2590 return err;
2591
2592 if (link->doit == NULL)
2593 return -EINVAL;
2594
2595 return link->doit(skb, nlh, attrs);
2596 }
2597
2598 static void xfrm_netlink_rcv(struct sk_buff *skb)
2599 {
2600 struct net *net = sock_net(skb->sk);
2601
2602 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2603 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2604 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2605 }
2606
2607 static inline unsigned int xfrm_expire_msgsize(void)
2608 {
2609 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2610 + nla_total_size(sizeof(struct xfrm_mark));
2611 }
2612
2613 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2614 {
2615 struct xfrm_user_expire *ue;
2616 struct nlmsghdr *nlh;
2617 int err;
2618
2619 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2620 if (nlh == NULL)
2621 return -EMSGSIZE;
2622
2623 ue = nlmsg_data(nlh);
2624 copy_to_user_state(x, &ue->state);
2625 ue->hard = (c->data.hard != 0) ? 1 : 0;
2626 /* clear the padding bytes */
2627 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2628
2629 err = xfrm_mark_put(skb, &x->mark);
2630 if (err)
2631 return err;
2632
2633 nlmsg_end(skb, nlh);
2634 return 0;
2635 }
2636
2637 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2638 {
2639 struct net *net = xs_net(x);
2640 struct sk_buff *skb;
2641
2642 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2643 if (skb == NULL)
2644 return -ENOMEM;
2645
2646 if (build_expire(skb, x, c) < 0) {
2647 kfree_skb(skb);
2648 return -EMSGSIZE;
2649 }
2650
2651 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2652 }
2653
2654 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2655 {
2656 struct net *net = xs_net(x);
2657 struct sk_buff *skb;
2658 int err;
2659
2660 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2661 if (skb == NULL)
2662 return -ENOMEM;
2663
2664 err = build_aevent(skb, x, c);
2665 BUG_ON(err < 0);
2666
2667 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2668 }
2669
2670 static int xfrm_notify_sa_flush(const struct km_event *c)
2671 {
2672 struct net *net = c->net;
2673 struct xfrm_usersa_flush *p;
2674 struct nlmsghdr *nlh;
2675 struct sk_buff *skb;
2676 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2677
2678 skb = nlmsg_new(len, GFP_ATOMIC);
2679 if (skb == NULL)
2680 return -ENOMEM;
2681
2682 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2683 if (nlh == NULL) {
2684 kfree_skb(skb);
2685 return -EMSGSIZE;
2686 }
2687
2688 p = nlmsg_data(nlh);
2689 p->proto = c->data.proto;
2690
2691 nlmsg_end(skb, nlh);
2692
2693 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2694 }
2695
2696 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2697 {
2698 unsigned int l = 0;
2699 if (x->aead)
2700 l += nla_total_size(aead_len(x->aead));
2701 if (x->aalg) {
2702 l += nla_total_size(sizeof(struct xfrm_algo) +
2703 (x->aalg->alg_key_len + 7) / 8);
2704 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2705 }
2706 if (x->ealg)
2707 l += nla_total_size(xfrm_alg_len(x->ealg));
2708 if (x->calg)
2709 l += nla_total_size(sizeof(*x->calg));
2710 if (x->encap)
2711 l += nla_total_size(sizeof(*x->encap));
2712 if (x->tfcpad)
2713 l += nla_total_size(sizeof(x->tfcpad));
2714 if (x->replay_esn)
2715 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2716 else
2717 l += nla_total_size(sizeof(struct xfrm_replay_state));
2718 if (x->security)
2719 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2720 x->security->ctx_len);
2721 if (x->coaddr)
2722 l += nla_total_size(sizeof(*x->coaddr));
2723 if (x->props.extra_flags)
2724 l += nla_total_size(sizeof(x->props.extra_flags));
2725 if (x->xso.dev)
2726 l += nla_total_size(sizeof(x->xso));
2727 if (x->props.output_mark)
2728 l += nla_total_size(sizeof(x->props.output_mark));
2729
2730 /* Must count x->lastused as it may become non-zero behind our back. */
2731 l += nla_total_size_64bit(sizeof(u64));
2732
2733 return l;
2734 }
2735
2736 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2737 {
2738 struct net *net = xs_net(x);
2739 struct xfrm_usersa_info *p;
2740 struct xfrm_usersa_id *id;
2741 struct nlmsghdr *nlh;
2742 struct sk_buff *skb;
2743 unsigned int len = xfrm_sa_len(x);
2744 unsigned int headlen;
2745 int err;
2746
2747 headlen = sizeof(*p);
2748 if (c->event == XFRM_MSG_DELSA) {
2749 len += nla_total_size(headlen);
2750 headlen = sizeof(*id);
2751 len += nla_total_size(sizeof(struct xfrm_mark));
2752 }
2753 len += NLMSG_ALIGN(headlen);
2754
2755 skb = nlmsg_new(len, GFP_ATOMIC);
2756 if (skb == NULL)
2757 return -ENOMEM;
2758
2759 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2760 err = -EMSGSIZE;
2761 if (nlh == NULL)
2762 goto out_free_skb;
2763
2764 p = nlmsg_data(nlh);
2765 if (c->event == XFRM_MSG_DELSA) {
2766 struct nlattr *attr;
2767
2768 id = nlmsg_data(nlh);
2769 memset(id, 0, sizeof(*id));
2770 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2771 id->spi = x->id.spi;
2772 id->family = x->props.family;
2773 id->proto = x->id.proto;
2774
2775 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2776 err = -EMSGSIZE;
2777 if (attr == NULL)
2778 goto out_free_skb;
2779
2780 p = nla_data(attr);
2781 }
2782 err = copy_to_user_state_extra(x, p, skb);
2783 if (err)
2784 goto out_free_skb;
2785
2786 nlmsg_end(skb, nlh);
2787
2788 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2789
2790 out_free_skb:
2791 kfree_skb(skb);
2792 return err;
2793 }
2794
2795 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2796 {
2797
2798 switch (c->event) {
2799 case XFRM_MSG_EXPIRE:
2800 return xfrm_exp_state_notify(x, c);
2801 case XFRM_MSG_NEWAE:
2802 return xfrm_aevent_state_notify(x, c);
2803 case XFRM_MSG_DELSA:
2804 case XFRM_MSG_UPDSA:
2805 case XFRM_MSG_NEWSA:
2806 return xfrm_notify_sa(x, c);
2807 case XFRM_MSG_FLUSHSA:
2808 return xfrm_notify_sa_flush(c);
2809 default:
2810 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2811 c->event);
2812 break;
2813 }
2814
2815 return 0;
2816
2817 }
2818
2819 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2820 struct xfrm_policy *xp)
2821 {
2822 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2823 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2824 + nla_total_size(sizeof(struct xfrm_mark))
2825 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2826 + userpolicy_type_attrsize();
2827 }
2828
2829 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2830 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2831 {
2832 __u32 seq = xfrm_get_acqseq();
2833 struct xfrm_user_acquire *ua;
2834 struct nlmsghdr *nlh;
2835 int err;
2836
2837 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2838 if (nlh == NULL)
2839 return -EMSGSIZE;
2840
2841 ua = nlmsg_data(nlh);
2842 memcpy(&ua->id, &x->id, sizeof(ua->id));
2843 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2844 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2845 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2846 ua->aalgos = xt->aalgos;
2847 ua->ealgos = xt->ealgos;
2848 ua->calgos = xt->calgos;
2849 ua->seq = x->km.seq = seq;
2850
2851 err = copy_to_user_tmpl(xp, skb);
2852 if (!err)
2853 err = copy_to_user_state_sec_ctx(x, skb);
2854 if (!err)
2855 err = copy_to_user_policy_type(xp->type, skb);
2856 if (!err)
2857 err = xfrm_mark_put(skb, &xp->mark);
2858 if (err) {
2859 nlmsg_cancel(skb, nlh);
2860 return err;
2861 }
2862
2863 nlmsg_end(skb, nlh);
2864 return 0;
2865 }
2866
2867 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2868 struct xfrm_policy *xp)
2869 {
2870 struct net *net = xs_net(x);
2871 struct sk_buff *skb;
2872 int err;
2873
2874 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2875 if (skb == NULL)
2876 return -ENOMEM;
2877
2878 err = build_acquire(skb, x, xt, xp);
2879 BUG_ON(err < 0);
2880
2881 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2882 }
2883
2884 /* User gives us xfrm_user_policy_info followed by an array of 0
2885 * or more templates.
2886 */
2887 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2888 u8 *data, int len, int *dir)
2889 {
2890 struct net *net = sock_net(sk);
2891 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2892 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2893 struct xfrm_policy *xp;
2894 int nr;
2895
2896 switch (sk->sk_family) {
2897 case AF_INET:
2898 if (opt != IP_XFRM_POLICY) {
2899 *dir = -EOPNOTSUPP;
2900 return NULL;
2901 }
2902 break;
2903 #if IS_ENABLED(CONFIG_IPV6)
2904 case AF_INET6:
2905 if (opt != IPV6_XFRM_POLICY) {
2906 *dir = -EOPNOTSUPP;
2907 return NULL;
2908 }
2909 break;
2910 #endif
2911 default:
2912 *dir = -EINVAL;
2913 return NULL;
2914 }
2915
2916 *dir = -EINVAL;
2917
2918 if (len < sizeof(*p) ||
2919 verify_newpolicy_info(p))
2920 return NULL;
2921
2922 nr = ((len - sizeof(*p)) / sizeof(*ut));
2923 if (validate_tmpl(nr, ut, p->sel.family))
2924 return NULL;
2925
2926 if (p->dir > XFRM_POLICY_OUT)
2927 return NULL;
2928
2929 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2930 if (xp == NULL) {
2931 *dir = -ENOBUFS;
2932 return NULL;
2933 }
2934
2935 copy_from_user_policy(xp, p);
2936 xp->type = XFRM_POLICY_TYPE_MAIN;
2937 copy_templates(xp, ut, nr);
2938
2939 *dir = p->dir;
2940
2941 return xp;
2942 }
2943
2944 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2945 {
2946 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2947 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2948 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2949 + nla_total_size(sizeof(struct xfrm_mark))
2950 + userpolicy_type_attrsize();
2951 }
2952
2953 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2954 int dir, const struct km_event *c)
2955 {
2956 struct xfrm_user_polexpire *upe;
2957 int hard = c->data.hard;
2958 struct nlmsghdr *nlh;
2959 int err;
2960
2961 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2962 if (nlh == NULL)
2963 return -EMSGSIZE;
2964
2965 upe = nlmsg_data(nlh);
2966 copy_to_user_policy(xp, &upe->pol, dir);
2967 err = copy_to_user_tmpl(xp, skb);
2968 if (!err)
2969 err = copy_to_user_sec_ctx(xp, skb);
2970 if (!err)
2971 err = copy_to_user_policy_type(xp->type, skb);
2972 if (!err)
2973 err = xfrm_mark_put(skb, &xp->mark);
2974 if (err) {
2975 nlmsg_cancel(skb, nlh);
2976 return err;
2977 }
2978 upe->hard = !!hard;
2979
2980 nlmsg_end(skb, nlh);
2981 return 0;
2982 }
2983
2984 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2985 {
2986 struct net *net = xp_net(xp);
2987 struct sk_buff *skb;
2988 int err;
2989
2990 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2991 if (skb == NULL)
2992 return -ENOMEM;
2993
2994 err = build_polexpire(skb, xp, dir, c);
2995 BUG_ON(err < 0);
2996
2997 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2998 }
2999
3000 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3001 {
3002 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3003 struct net *net = xp_net(xp);
3004 struct xfrm_userpolicy_info *p;
3005 struct xfrm_userpolicy_id *id;
3006 struct nlmsghdr *nlh;
3007 struct sk_buff *skb;
3008 unsigned int headlen;
3009 int err;
3010
3011 headlen = sizeof(*p);
3012 if (c->event == XFRM_MSG_DELPOLICY) {
3013 len += nla_total_size(headlen);
3014 headlen = sizeof(*id);
3015 }
3016 len += userpolicy_type_attrsize();
3017 len += nla_total_size(sizeof(struct xfrm_mark));
3018 len += NLMSG_ALIGN(headlen);
3019
3020 skb = nlmsg_new(len, GFP_ATOMIC);
3021 if (skb == NULL)
3022 return -ENOMEM;
3023
3024 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3025 err = -EMSGSIZE;
3026 if (nlh == NULL)
3027 goto out_free_skb;
3028
3029 p = nlmsg_data(nlh);
3030 if (c->event == XFRM_MSG_DELPOLICY) {
3031 struct nlattr *attr;
3032
3033 id = nlmsg_data(nlh);
3034 memset(id, 0, sizeof(*id));
3035 id->dir = dir;
3036 if (c->data.byid)
3037 id->index = xp->index;
3038 else
3039 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3040
3041 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3042 err = -EMSGSIZE;
3043 if (attr == NULL)
3044 goto out_free_skb;
3045
3046 p = nla_data(attr);
3047 }
3048
3049 copy_to_user_policy(xp, p, dir);
3050 err = copy_to_user_tmpl(xp, skb);
3051 if (!err)
3052 err = copy_to_user_policy_type(xp->type, skb);
3053 if (!err)
3054 err = xfrm_mark_put(skb, &xp->mark);
3055 if (err)
3056 goto out_free_skb;
3057
3058 nlmsg_end(skb, nlh);
3059
3060 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3061
3062 out_free_skb:
3063 kfree_skb(skb);
3064 return err;
3065 }
3066
3067 static int xfrm_notify_policy_flush(const struct km_event *c)
3068 {
3069 struct net *net = c->net;
3070 struct nlmsghdr *nlh;
3071 struct sk_buff *skb;
3072 int err;
3073
3074 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3075 if (skb == NULL)
3076 return -ENOMEM;
3077
3078 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3079 err = -EMSGSIZE;
3080 if (nlh == NULL)
3081 goto out_free_skb;
3082 err = copy_to_user_policy_type(c->data.type, skb);
3083 if (err)
3084 goto out_free_skb;
3085
3086 nlmsg_end(skb, nlh);
3087
3088 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3089
3090 out_free_skb:
3091 kfree_skb(skb);
3092 return err;
3093 }
3094
3095 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3096 {
3097
3098 switch (c->event) {
3099 case XFRM_MSG_NEWPOLICY:
3100 case XFRM_MSG_UPDPOLICY:
3101 case XFRM_MSG_DELPOLICY:
3102 return xfrm_notify_policy(xp, dir, c);
3103 case XFRM_MSG_FLUSHPOLICY:
3104 return xfrm_notify_policy_flush(c);
3105 case XFRM_MSG_POLEXPIRE:
3106 return xfrm_exp_policy_notify(xp, dir, c);
3107 default:
3108 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3109 c->event);
3110 }
3111
3112 return 0;
3113
3114 }
3115
3116 static inline unsigned int xfrm_report_msgsize(void)
3117 {
3118 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3119 }
3120
3121 static int build_report(struct sk_buff *skb, u8 proto,
3122 struct xfrm_selector *sel, xfrm_address_t *addr)
3123 {
3124 struct xfrm_user_report *ur;
3125 struct nlmsghdr *nlh;
3126
3127 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3128 if (nlh == NULL)
3129 return -EMSGSIZE;
3130
3131 ur = nlmsg_data(nlh);
3132 ur->proto = proto;
3133 memcpy(&ur->sel, sel, sizeof(ur->sel));
3134
3135 if (addr) {
3136 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3137 if (err) {
3138 nlmsg_cancel(skb, nlh);
3139 return err;
3140 }
3141 }
3142 nlmsg_end(skb, nlh);
3143 return 0;
3144 }
3145
3146 static int xfrm_send_report(struct net *net, u8 proto,
3147 struct xfrm_selector *sel, xfrm_address_t *addr)
3148 {
3149 struct sk_buff *skb;
3150 int err;
3151
3152 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3153 if (skb == NULL)
3154 return -ENOMEM;
3155
3156 err = build_report(skb, proto, sel, addr);
3157 BUG_ON(err < 0);
3158
3159 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3160 }
3161
3162 static inline unsigned int xfrm_mapping_msgsize(void)
3163 {
3164 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3165 }
3166
3167 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3168 xfrm_address_t *new_saddr, __be16 new_sport)
3169 {
3170 struct xfrm_user_mapping *um;
3171 struct nlmsghdr *nlh;
3172
3173 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3174 if (nlh == NULL)
3175 return -EMSGSIZE;
3176
3177 um = nlmsg_data(nlh);
3178
3179 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3180 um->id.spi = x->id.spi;
3181 um->id.family = x->props.family;
3182 um->id.proto = x->id.proto;
3183 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3184 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3185 um->new_sport = new_sport;
3186 um->old_sport = x->encap->encap_sport;
3187 um->reqid = x->props.reqid;
3188
3189 nlmsg_end(skb, nlh);
3190 return 0;
3191 }
3192
3193 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3194 __be16 sport)
3195 {
3196 struct net *net = xs_net(x);
3197 struct sk_buff *skb;
3198 int err;
3199
3200 if (x->id.proto != IPPROTO_ESP)
3201 return -EINVAL;
3202
3203 if (!x->encap)
3204 return -EINVAL;
3205
3206 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3207 if (skb == NULL)
3208 return -ENOMEM;
3209
3210 err = build_mapping(skb, x, ipaddr, sport);
3211 BUG_ON(err < 0);
3212
3213 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3214 }
3215
3216 static bool xfrm_is_alive(const struct km_event *c)
3217 {
3218 return (bool)xfrm_acquire_is_on(c->net);
3219 }
3220
3221 static struct xfrm_mgr netlink_mgr = {
3222 .notify = xfrm_send_state_notify,
3223 .acquire = xfrm_send_acquire,
3224 .compile_policy = xfrm_compile_policy,
3225 .notify_policy = xfrm_send_policy_notify,
3226 .report = xfrm_send_report,
3227 .migrate = xfrm_send_migrate,
3228 .new_mapping = xfrm_send_mapping,
3229 .is_alive = xfrm_is_alive,
3230 };
3231
3232 static int __net_init xfrm_user_net_init(struct net *net)
3233 {
3234 struct sock *nlsk;
3235 struct netlink_kernel_cfg cfg = {
3236 .groups = XFRMNLGRP_MAX,
3237 .input = xfrm_netlink_rcv,
3238 };
3239
3240 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3241 if (nlsk == NULL)
3242 return -ENOMEM;
3243 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3244 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3245 return 0;
3246 }
3247
3248 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3249 {
3250 struct net *net;
3251 list_for_each_entry(net, net_exit_list, exit_list)
3252 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3253 synchronize_net();
3254 list_for_each_entry(net, net_exit_list, exit_list)
3255 netlink_kernel_release(net->xfrm.nlsk_stash);
3256 }
3257
3258 static struct pernet_operations xfrm_user_net_ops = {
3259 .init = xfrm_user_net_init,
3260 .exit_batch = xfrm_user_net_exit,
3261 };
3262
3263 static int __init xfrm_user_init(void)
3264 {
3265 int rv;
3266
3267 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3268
3269 rv = register_pernet_subsys(&xfrm_user_net_ops);
3270 if (rv < 0)
3271 return rv;
3272 rv = xfrm_register_km(&netlink_mgr);
3273 if (rv < 0)
3274 unregister_pernet_subsys(&xfrm_user_net_ops);
3275 return rv;
3276 }
3277
3278 static void __exit xfrm_user_exit(void)
3279 {
3280 xfrm_unregister_km(&netlink_mgr);
3281 unregister_pernet_subsys(&xfrm_user_net_ops);
3282 }
3283
3284 module_init(xfrm_user_init);
3285 module_exit(xfrm_user_exit);
3286 MODULE_LICENSE("GPL");
3287 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3288
CRIS linux kernel tree