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Linux 4.6-rc6
[linux/fpc-iii.git] / net / xfrm / xfrm_user.c
blob2cc7af858c6f2a599aac11926d018d937622b236
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 <asm/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) < 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[CRYPTO_MAX_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) < xfrm_alg_auth_len(algp))
72 return -EINVAL;
73
74 algp->alg_name[CRYPTO_MAX_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) < aead_len(algp))
88 return -EINVAL;
89
90 algp->alg_name[CRYPTO_MAX_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) < 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 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 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
416 return -EINVAL;
417
418 return 0;
419 }
420
421 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
422 struct xfrm_replay_state_esn **preplay_esn,
423 struct nlattr *rta)
424 {
425 struct xfrm_replay_state_esn *p, *pp, *up;
426 int klen, ulen;
427
428 if (!rta)
429 return 0;
430
431 up = nla_data(rta);
432 klen = xfrm_replay_state_esn_len(up);
433 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
434
435 p = kzalloc(klen, GFP_KERNEL);
436 if (!p)
437 return -ENOMEM;
438
439 pp = kzalloc(klen, GFP_KERNEL);
440 if (!pp) {
441 kfree(p);
442 return -ENOMEM;
443 }
444
445 memcpy(p, up, ulen);
446 memcpy(pp, up, ulen);
447
448 *replay_esn = p;
449 *preplay_esn = pp;
450
451 return 0;
452 }
453
454 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
455 {
456 int len = 0;
457
458 if (xfrm_ctx) {
459 len += sizeof(struct xfrm_user_sec_ctx);
460 len += xfrm_ctx->ctx_len;
461 }
462 return len;
463 }
464
465 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
466 {
467 memcpy(&x->id, &p->id, sizeof(x->id));
468 memcpy(&x->sel, &p->sel, sizeof(x->sel));
469 memcpy(&x->lft, &p->lft, sizeof(x->lft));
470 x->props.mode = p->mode;
471 x->props.replay_window = min_t(unsigned int, p->replay_window,
472 sizeof(x->replay.bitmap) * 8);
473 x->props.reqid = p->reqid;
474 x->props.family = p->family;
475 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
476 x->props.flags = p->flags;
477
478 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
479 x->sel.family = p->family;
480 }
481
482 /*
483 * someday when pfkey also has support, we could have the code
484 * somehow made shareable and move it to xfrm_state.c - JHS
485 *
486 */
487 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
488 int update_esn)
489 {
490 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
491 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
492 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
493 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
494 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
495
496 if (re) {
497 struct xfrm_replay_state_esn *replay_esn;
498 replay_esn = nla_data(re);
499 memcpy(x->replay_esn, replay_esn,
500 xfrm_replay_state_esn_len(replay_esn));
501 memcpy(x->preplay_esn, replay_esn,
502 xfrm_replay_state_esn_len(replay_esn));
503 }
504
505 if (rp) {
506 struct xfrm_replay_state *replay;
507 replay = nla_data(rp);
508 memcpy(&x->replay, replay, sizeof(*replay));
509 memcpy(&x->preplay, replay, sizeof(*replay));
510 }
511
512 if (lt) {
513 struct xfrm_lifetime_cur *ltime;
514 ltime = nla_data(lt);
515 x->curlft.bytes = ltime->bytes;
516 x->curlft.packets = ltime->packets;
517 x->curlft.add_time = ltime->add_time;
518 x->curlft.use_time = ltime->use_time;
519 }
520
521 if (et)
522 x->replay_maxage = nla_get_u32(et);
523
524 if (rt)
525 x->replay_maxdiff = nla_get_u32(rt);
526 }
527
528 static struct xfrm_state *xfrm_state_construct(struct net *net,
529 struct xfrm_usersa_info *p,
530 struct nlattr **attrs,
531 int *errp)
532 {
533 struct xfrm_state *x = xfrm_state_alloc(net);
534 int err = -ENOMEM;
535
536 if (!x)
537 goto error_no_put;
538
539 copy_from_user_state(x, p);
540
541 if (attrs[XFRMA_SA_EXTRA_FLAGS])
542 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
543
544 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
545 goto error;
546 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
547 attrs[XFRMA_ALG_AUTH_TRUNC])))
548 goto error;
549 if (!x->props.aalgo) {
550 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
551 attrs[XFRMA_ALG_AUTH])))
552 goto error;
553 }
554 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
555 goto error;
556 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
557 xfrm_calg_get_byname,
558 attrs[XFRMA_ALG_COMP])))
559 goto error;
560
561 if (attrs[XFRMA_ENCAP]) {
562 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
563 sizeof(*x->encap), GFP_KERNEL);
564 if (x->encap == NULL)
565 goto error;
566 }
567
568 if (attrs[XFRMA_TFCPAD])
569 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
570
571 if (attrs[XFRMA_COADDR]) {
572 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
573 sizeof(*x->coaddr), GFP_KERNEL);
574 if (x->coaddr == NULL)
575 goto error;
576 }
577
578 xfrm_mark_get(attrs, &x->mark);
579
580 err = __xfrm_init_state(x, false);
581 if (err)
582 goto error;
583
584 if (attrs[XFRMA_SEC_CTX] &&
585 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
586 goto error;
587
588 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
589 attrs[XFRMA_REPLAY_ESN_VAL])))
590 goto error;
591
592 x->km.seq = p->seq;
593 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
594 /* sysctl_xfrm_aevent_etime is in 100ms units */
595 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
596
597 if ((err = xfrm_init_replay(x)))
598 goto error;
599
600 /* override default values from above */
601 xfrm_update_ae_params(x, attrs, 0);
602
603 return x;
604
605 error:
606 x->km.state = XFRM_STATE_DEAD;
607 xfrm_state_put(x);
608 error_no_put:
609 *errp = err;
610 return NULL;
611 }
612
613 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
614 struct nlattr **attrs)
615 {
616 struct net *net = sock_net(skb->sk);
617 struct xfrm_usersa_info *p = nlmsg_data(nlh);
618 struct xfrm_state *x;
619 int err;
620 struct km_event c;
621
622 err = verify_newsa_info(p, attrs);
623 if (err)
624 return err;
625
626 x = xfrm_state_construct(net, p, attrs, &err);
627 if (!x)
628 return err;
629
630 xfrm_state_hold(x);
631 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
632 err = xfrm_state_add(x);
633 else
634 err = xfrm_state_update(x);
635
636 xfrm_audit_state_add(x, err ? 0 : 1, true);
637
638 if (err < 0) {
639 x->km.state = XFRM_STATE_DEAD;
640 __xfrm_state_put(x);
641 goto out;
642 }
643
644 c.seq = nlh->nlmsg_seq;
645 c.portid = nlh->nlmsg_pid;
646 c.event = nlh->nlmsg_type;
647
648 km_state_notify(x, &c);
649 out:
650 xfrm_state_put(x);
651 return err;
652 }
653
654 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
655 struct xfrm_usersa_id *p,
656 struct nlattr **attrs,
657 int *errp)
658 {
659 struct xfrm_state *x = NULL;
660 struct xfrm_mark m;
661 int err;
662 u32 mark = xfrm_mark_get(attrs, &m);
663
664 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
665 err = -ESRCH;
666 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
667 } else {
668 xfrm_address_t *saddr = NULL;
669
670 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
671 if (!saddr) {
672 err = -EINVAL;
673 goto out;
674 }
675
676 err = -ESRCH;
677 x = xfrm_state_lookup_byaddr(net, mark,
678 &p->daddr, saddr,
679 p->proto, p->family);
680 }
681
682 out:
683 if (!x && errp)
684 *errp = err;
685 return x;
686 }
687
688 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
689 struct nlattr **attrs)
690 {
691 struct net *net = sock_net(skb->sk);
692 struct xfrm_state *x;
693 int err = -ESRCH;
694 struct km_event c;
695 struct xfrm_usersa_id *p = nlmsg_data(nlh);
696
697 x = xfrm_user_state_lookup(net, p, attrs, &err);
698 if (x == NULL)
699 return err;
700
701 if ((err = security_xfrm_state_delete(x)) != 0)
702 goto out;
703
704 if (xfrm_state_kern(x)) {
705 err = -EPERM;
706 goto out;
707 }
708
709 err = xfrm_state_delete(x);
710
711 if (err < 0)
712 goto out;
713
714 c.seq = nlh->nlmsg_seq;
715 c.portid = nlh->nlmsg_pid;
716 c.event = nlh->nlmsg_type;
717 km_state_notify(x, &c);
718
719 out:
720 xfrm_audit_state_delete(x, err ? 0 : 1, true);
721 xfrm_state_put(x);
722 return err;
723 }
724
725 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
726 {
727 memset(p, 0, sizeof(*p));
728 memcpy(&p->id, &x->id, sizeof(p->id));
729 memcpy(&p->sel, &x->sel, sizeof(p->sel));
730 memcpy(&p->lft, &x->lft, sizeof(p->lft));
731 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
732 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
733 put_unaligned(x->stats.replay, &p->stats.replay);
734 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
735 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
736 p->mode = x->props.mode;
737 p->replay_window = x->props.replay_window;
738 p->reqid = x->props.reqid;
739 p->family = x->props.family;
740 p->flags = x->props.flags;
741 p->seq = x->km.seq;
742 }
743
744 struct xfrm_dump_info {
745 struct sk_buff *in_skb;
746 struct sk_buff *out_skb;
747 u32 nlmsg_seq;
748 u16 nlmsg_flags;
749 };
750
751 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
752 {
753 struct xfrm_user_sec_ctx *uctx;
754 struct nlattr *attr;
755 int ctx_size = sizeof(*uctx) + s->ctx_len;
756
757 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
758 if (attr == NULL)
759 return -EMSGSIZE;
760
761 uctx = nla_data(attr);
762 uctx->exttype = XFRMA_SEC_CTX;
763 uctx->len = ctx_size;
764 uctx->ctx_doi = s->ctx_doi;
765 uctx->ctx_alg = s->ctx_alg;
766 uctx->ctx_len = s->ctx_len;
767 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
768
769 return 0;
770 }
771
772 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
773 {
774 struct xfrm_algo *algo;
775 struct nlattr *nla;
776
777 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
778 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
779 if (!nla)
780 return -EMSGSIZE;
781
782 algo = nla_data(nla);
783 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
784 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
785 algo->alg_key_len = auth->alg_key_len;
786
787 return 0;
788 }
789
790 /* Don't change this without updating xfrm_sa_len! */
791 static int copy_to_user_state_extra(struct xfrm_state *x,
792 struct xfrm_usersa_info *p,
793 struct sk_buff *skb)
794 {
795 int ret = 0;
796
797 copy_to_user_state(x, p);
798
799 if (x->props.extra_flags) {
800 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
801 x->props.extra_flags);
802 if (ret)
803 goto out;
804 }
805
806 if (x->coaddr) {
807 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
808 if (ret)
809 goto out;
810 }
811 if (x->lastused) {
812 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
813 if (ret)
814 goto out;
815 }
816 if (x->aead) {
817 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
818 if (ret)
819 goto out;
820 }
821 if (x->aalg) {
822 ret = copy_to_user_auth(x->aalg, skb);
823 if (!ret)
824 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
825 xfrm_alg_auth_len(x->aalg), x->aalg);
826 if (ret)
827 goto out;
828 }
829 if (x->ealg) {
830 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
831 if (ret)
832 goto out;
833 }
834 if (x->calg) {
835 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
836 if (ret)
837 goto out;
838 }
839 if (x->encap) {
840 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
841 if (ret)
842 goto out;
843 }
844 if (x->tfcpad) {
845 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
846 if (ret)
847 goto out;
848 }
849 ret = xfrm_mark_put(skb, &x->mark);
850 if (ret)
851 goto out;
852 if (x->replay_esn)
853 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
854 xfrm_replay_state_esn_len(x->replay_esn),
855 x->replay_esn);
856 else
857 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
858 &x->replay);
859 if (ret)
860 goto out;
861 if (x->security)
862 ret = copy_sec_ctx(x->security, skb);
863 out:
864 return ret;
865 }
866
867 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
868 {
869 struct xfrm_dump_info *sp = ptr;
870 struct sk_buff *in_skb = sp->in_skb;
871 struct sk_buff *skb = sp->out_skb;
872 struct xfrm_usersa_info *p;
873 struct nlmsghdr *nlh;
874 int err;
875
876 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
877 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
878 if (nlh == NULL)
879 return -EMSGSIZE;
880
881 p = nlmsg_data(nlh);
882
883 err = copy_to_user_state_extra(x, p, skb);
884 if (err) {
885 nlmsg_cancel(skb, nlh);
886 return err;
887 }
888 nlmsg_end(skb, nlh);
889 return 0;
890 }
891
892 static int xfrm_dump_sa_done(struct netlink_callback *cb)
893 {
894 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
895 struct sock *sk = cb->skb->sk;
896 struct net *net = sock_net(sk);
897
898 xfrm_state_walk_done(walk, net);
899 return 0;
900 }
901
902 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
903 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
904 {
905 struct net *net = sock_net(skb->sk);
906 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
907 struct xfrm_dump_info info;
908
909 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
910 sizeof(cb->args) - sizeof(cb->args[0]));
911
912 info.in_skb = cb->skb;
913 info.out_skb = skb;
914 info.nlmsg_seq = cb->nlh->nlmsg_seq;
915 info.nlmsg_flags = NLM_F_MULTI;
916
917 if (!cb->args[0]) {
918 struct nlattr *attrs[XFRMA_MAX+1];
919 struct xfrm_address_filter *filter = NULL;
920 u8 proto = 0;
921 int err;
922
923 cb->args[0] = 1;
924
925 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
926 xfrma_policy);
927 if (err < 0)
928 return err;
929
930 if (attrs[XFRMA_ADDRESS_FILTER]) {
931 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
932 sizeof(*filter), GFP_KERNEL);
933 if (filter == NULL)
934 return -ENOMEM;
935 }
936
937 if (attrs[XFRMA_PROTO])
938 proto = nla_get_u8(attrs[XFRMA_PROTO]);
939
940 xfrm_state_walk_init(walk, proto, filter);
941 }
942
943 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
944
945 return skb->len;
946 }
947
948 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
949 struct xfrm_state *x, u32 seq)
950 {
951 struct xfrm_dump_info info;
952 struct sk_buff *skb;
953 int err;
954
955 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
956 if (!skb)
957 return ERR_PTR(-ENOMEM);
958
959 info.in_skb = in_skb;
960 info.out_skb = skb;
961 info.nlmsg_seq = seq;
962 info.nlmsg_flags = 0;
963
964 err = dump_one_state(x, 0, &info);
965 if (err) {
966 kfree_skb(skb);
967 return ERR_PTR(err);
968 }
969
970 return skb;
971 }
972
973 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
974 * Must be called with RCU read lock.
975 */
976 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
977 u32 pid, unsigned int group)
978 {
979 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
980
981 if (nlsk)
982 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
983 else
984 return -1;
985 }
986
987 static inline size_t xfrm_spdinfo_msgsize(void)
988 {
989 return NLMSG_ALIGN(4)
990 + nla_total_size(sizeof(struct xfrmu_spdinfo))
991 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
992 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
993 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
994 }
995
996 static int build_spdinfo(struct sk_buff *skb, struct net *net,
997 u32 portid, u32 seq, u32 flags)
998 {
999 struct xfrmk_spdinfo si;
1000 struct xfrmu_spdinfo spc;
1001 struct xfrmu_spdhinfo sph;
1002 struct xfrmu_spdhthresh spt4, spt6;
1003 struct nlmsghdr *nlh;
1004 int err;
1005 u32 *f;
1006 unsigned lseq;
1007
1008 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1009 if (nlh == NULL) /* shouldn't really happen ... */
1010 return -EMSGSIZE;
1011
1012 f = nlmsg_data(nlh);
1013 *f = flags;
1014 xfrm_spd_getinfo(net, &si);
1015 spc.incnt = si.incnt;
1016 spc.outcnt = si.outcnt;
1017 spc.fwdcnt = si.fwdcnt;
1018 spc.inscnt = si.inscnt;
1019 spc.outscnt = si.outscnt;
1020 spc.fwdscnt = si.fwdscnt;
1021 sph.spdhcnt = si.spdhcnt;
1022 sph.spdhmcnt = si.spdhmcnt;
1023
1024 do {
1025 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1026
1027 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1028 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1029 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1030 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1031 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1032
1033 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1034 if (!err)
1035 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1036 if (!err)
1037 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1038 if (!err)
1039 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1040 if (err) {
1041 nlmsg_cancel(skb, nlh);
1042 return err;
1043 }
1044
1045 nlmsg_end(skb, nlh);
1046 return 0;
1047 }
1048
1049 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1050 struct nlattr **attrs)
1051 {
1052 struct net *net = sock_net(skb->sk);
1053 struct xfrmu_spdhthresh *thresh4 = NULL;
1054 struct xfrmu_spdhthresh *thresh6 = NULL;
1055
1056 /* selector prefixlen thresholds to hash policies */
1057 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1058 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1059
1060 if (nla_len(rta) < sizeof(*thresh4))
1061 return -EINVAL;
1062 thresh4 = nla_data(rta);
1063 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1064 return -EINVAL;
1065 }
1066 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1067 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1068
1069 if (nla_len(rta) < sizeof(*thresh6))
1070 return -EINVAL;
1071 thresh6 = nla_data(rta);
1072 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1073 return -EINVAL;
1074 }
1075
1076 if (thresh4 || thresh6) {
1077 write_seqlock(&net->xfrm.policy_hthresh.lock);
1078 if (thresh4) {
1079 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1080 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1081 }
1082 if (thresh6) {
1083 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1084 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1085 }
1086 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1087
1088 xfrm_policy_hash_rebuild(net);
1089 }
1090
1091 return 0;
1092 }
1093
1094 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1095 struct nlattr **attrs)
1096 {
1097 struct net *net = sock_net(skb->sk);
1098 struct sk_buff *r_skb;
1099 u32 *flags = nlmsg_data(nlh);
1100 u32 sportid = NETLINK_CB(skb).portid;
1101 u32 seq = nlh->nlmsg_seq;
1102
1103 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1104 if (r_skb == NULL)
1105 return -ENOMEM;
1106
1107 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1108 BUG();
1109
1110 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1111 }
1112
1113 static inline size_t xfrm_sadinfo_msgsize(void)
1114 {
1115 return NLMSG_ALIGN(4)
1116 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1117 + nla_total_size(4); /* XFRMA_SAD_CNT */
1118 }
1119
1120 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1121 u32 portid, u32 seq, u32 flags)
1122 {
1123 struct xfrmk_sadinfo si;
1124 struct xfrmu_sadhinfo sh;
1125 struct nlmsghdr *nlh;
1126 int err;
1127 u32 *f;
1128
1129 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1130 if (nlh == NULL) /* shouldn't really happen ... */
1131 return -EMSGSIZE;
1132
1133 f = nlmsg_data(nlh);
1134 *f = flags;
1135 xfrm_sad_getinfo(net, &si);
1136
1137 sh.sadhmcnt = si.sadhmcnt;
1138 sh.sadhcnt = si.sadhcnt;
1139
1140 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1141 if (!err)
1142 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1143 if (err) {
1144 nlmsg_cancel(skb, nlh);
1145 return err;
1146 }
1147
1148 nlmsg_end(skb, nlh);
1149 return 0;
1150 }
1151
1152 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1153 struct nlattr **attrs)
1154 {
1155 struct net *net = sock_net(skb->sk);
1156 struct sk_buff *r_skb;
1157 u32 *flags = nlmsg_data(nlh);
1158 u32 sportid = NETLINK_CB(skb).portid;
1159 u32 seq = nlh->nlmsg_seq;
1160
1161 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1162 if (r_skb == NULL)
1163 return -ENOMEM;
1164
1165 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1166 BUG();
1167
1168 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1169 }
1170
1171 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1172 struct nlattr **attrs)
1173 {
1174 struct net *net = sock_net(skb->sk);
1175 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1176 struct xfrm_state *x;
1177 struct sk_buff *resp_skb;
1178 int err = -ESRCH;
1179
1180 x = xfrm_user_state_lookup(net, p, attrs, &err);
1181 if (x == NULL)
1182 goto out_noput;
1183
1184 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1185 if (IS_ERR(resp_skb)) {
1186 err = PTR_ERR(resp_skb);
1187 } else {
1188 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1189 }
1190 xfrm_state_put(x);
1191 out_noput:
1192 return err;
1193 }
1194
1195 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1196 struct nlattr **attrs)
1197 {
1198 struct net *net = sock_net(skb->sk);
1199 struct xfrm_state *x;
1200 struct xfrm_userspi_info *p;
1201 struct sk_buff *resp_skb;
1202 xfrm_address_t *daddr;
1203 int family;
1204 int err;
1205 u32 mark;
1206 struct xfrm_mark m;
1207
1208 p = nlmsg_data(nlh);
1209 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1210 if (err)
1211 goto out_noput;
1212
1213 family = p->info.family;
1214 daddr = &p->info.id.daddr;
1215
1216 x = NULL;
1217
1218 mark = xfrm_mark_get(attrs, &m);
1219 if (p->info.seq) {
1220 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1221 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1222 xfrm_state_put(x);
1223 x = NULL;
1224 }
1225 }
1226
1227 if (!x)
1228 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1229 p->info.id.proto, daddr,
1230 &p->info.saddr, 1,
1231 family);
1232 err = -ENOENT;
1233 if (x == NULL)
1234 goto out_noput;
1235
1236 err = xfrm_alloc_spi(x, p->min, p->max);
1237 if (err)
1238 goto out;
1239
1240 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1241 if (IS_ERR(resp_skb)) {
1242 err = PTR_ERR(resp_skb);
1243 goto out;
1244 }
1245
1246 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1247
1248 out:
1249 xfrm_state_put(x);
1250 out_noput:
1251 return err;
1252 }
1253
1254 static int verify_policy_dir(u8 dir)
1255 {
1256 switch (dir) {
1257 case XFRM_POLICY_IN:
1258 case XFRM_POLICY_OUT:
1259 case XFRM_POLICY_FWD:
1260 break;
1261
1262 default:
1263 return -EINVAL;
1264 }
1265
1266 return 0;
1267 }
1268
1269 static int verify_policy_type(u8 type)
1270 {
1271 switch (type) {
1272 case XFRM_POLICY_TYPE_MAIN:
1273 #ifdef CONFIG_XFRM_SUB_POLICY
1274 case XFRM_POLICY_TYPE_SUB:
1275 #endif
1276 break;
1277
1278 default:
1279 return -EINVAL;
1280 }
1281
1282 return 0;
1283 }
1284
1285 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1286 {
1287 int ret;
1288
1289 switch (p->share) {
1290 case XFRM_SHARE_ANY:
1291 case XFRM_SHARE_SESSION:
1292 case XFRM_SHARE_USER:
1293 case XFRM_SHARE_UNIQUE:
1294 break;
1295
1296 default:
1297 return -EINVAL;
1298 }
1299
1300 switch (p->action) {
1301 case XFRM_POLICY_ALLOW:
1302 case XFRM_POLICY_BLOCK:
1303 break;
1304
1305 default:
1306 return -EINVAL;
1307 }
1308
1309 switch (p->sel.family) {
1310 case AF_INET:
1311 break;
1312
1313 case AF_INET6:
1314 #if IS_ENABLED(CONFIG_IPV6)
1315 break;
1316 #else
1317 return -EAFNOSUPPORT;
1318 #endif
1319
1320 default:
1321 return -EINVAL;
1322 }
1323
1324 ret = verify_policy_dir(p->dir);
1325 if (ret)
1326 return ret;
1327 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1328 return -EINVAL;
1329
1330 return 0;
1331 }
1332
1333 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1334 {
1335 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1336 struct xfrm_user_sec_ctx *uctx;
1337
1338 if (!rt)
1339 return 0;
1340
1341 uctx = nla_data(rt);
1342 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1343 }
1344
1345 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1346 int nr)
1347 {
1348 int i;
1349
1350 xp->xfrm_nr = nr;
1351 for (i = 0; i < nr; i++, ut++) {
1352 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1353
1354 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1355 memcpy(&t->saddr, &ut->saddr,
1356 sizeof(xfrm_address_t));
1357 t->reqid = ut->reqid;
1358 t->mode = ut->mode;
1359 t->share = ut->share;
1360 t->optional = ut->optional;
1361 t->aalgos = ut->aalgos;
1362 t->ealgos = ut->ealgos;
1363 t->calgos = ut->calgos;
1364 /* If all masks are ~0, then we allow all algorithms. */
1365 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1366 t->encap_family = ut->family;
1367 }
1368 }
1369
1370 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1371 {
1372 int i;
1373
1374 if (nr > XFRM_MAX_DEPTH)
1375 return -EINVAL;
1376
1377 for (i = 0; i < nr; i++) {
1378 /* We never validated the ut->family value, so many
1379 * applications simply leave it at zero. The check was
1380 * never made and ut->family was ignored because all
1381 * templates could be assumed to have the same family as
1382 * the policy itself. Now that we will have ipv4-in-ipv6
1383 * and ipv6-in-ipv4 tunnels, this is no longer true.
1384 */
1385 if (!ut[i].family)
1386 ut[i].family = family;
1387
1388 switch (ut[i].family) {
1389 case AF_INET:
1390 break;
1391 #if IS_ENABLED(CONFIG_IPV6)
1392 case AF_INET6:
1393 break;
1394 #endif
1395 default:
1396 return -EINVAL;
1397 }
1398 }
1399
1400 return 0;
1401 }
1402
1403 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1404 {
1405 struct nlattr *rt = attrs[XFRMA_TMPL];
1406
1407 if (!rt) {
1408 pol->xfrm_nr = 0;
1409 } else {
1410 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1411 int nr = nla_len(rt) / sizeof(*utmpl);
1412 int err;
1413
1414 err = validate_tmpl(nr, utmpl, pol->family);
1415 if (err)
1416 return err;
1417
1418 copy_templates(pol, utmpl, nr);
1419 }
1420 return 0;
1421 }
1422
1423 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1424 {
1425 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1426 struct xfrm_userpolicy_type *upt;
1427 u8 type = XFRM_POLICY_TYPE_MAIN;
1428 int err;
1429
1430 if (rt) {
1431 upt = nla_data(rt);
1432 type = upt->type;
1433 }
1434
1435 err = verify_policy_type(type);
1436 if (err)
1437 return err;
1438
1439 *tp = type;
1440 return 0;
1441 }
1442
1443 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1444 {
1445 xp->priority = p->priority;
1446 xp->index = p->index;
1447 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1448 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1449 xp->action = p->action;
1450 xp->flags = p->flags;
1451 xp->family = p->sel.family;
1452 /* XXX xp->share = p->share; */
1453 }
1454
1455 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1456 {
1457 memset(p, 0, sizeof(*p));
1458 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1459 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1460 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1461 p->priority = xp->priority;
1462 p->index = xp->index;
1463 p->sel.family = xp->family;
1464 p->dir = dir;
1465 p->action = xp->action;
1466 p->flags = xp->flags;
1467 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1468 }
1469
1470 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1471 {
1472 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1473 int err;
1474
1475 if (!xp) {
1476 *errp = -ENOMEM;
1477 return NULL;
1478 }
1479
1480 copy_from_user_policy(xp, p);
1481
1482 err = copy_from_user_policy_type(&xp->type, attrs);
1483 if (err)
1484 goto error;
1485
1486 if (!(err = copy_from_user_tmpl(xp, attrs)))
1487 err = copy_from_user_sec_ctx(xp, attrs);
1488 if (err)
1489 goto error;
1490
1491 xfrm_mark_get(attrs, &xp->mark);
1492
1493 return xp;
1494 error:
1495 *errp = err;
1496 xp->walk.dead = 1;
1497 xfrm_policy_destroy(xp);
1498 return NULL;
1499 }
1500
1501 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1502 struct nlattr **attrs)
1503 {
1504 struct net *net = sock_net(skb->sk);
1505 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1506 struct xfrm_policy *xp;
1507 struct km_event c;
1508 int err;
1509 int excl;
1510
1511 err = verify_newpolicy_info(p);
1512 if (err)
1513 return err;
1514 err = verify_sec_ctx_len(attrs);
1515 if (err)
1516 return err;
1517
1518 xp = xfrm_policy_construct(net, p, attrs, &err);
1519 if (!xp)
1520 return err;
1521
1522 /* shouldn't excl be based on nlh flags??
1523 * Aha! this is anti-netlink really i.e more pfkey derived
1524 * in netlink excl is a flag and you wouldnt need
1525 * a type XFRM_MSG_UPDPOLICY - JHS */
1526 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1527 err = xfrm_policy_insert(p->dir, xp, excl);
1528 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1529
1530 if (err) {
1531 security_xfrm_policy_free(xp->security);
1532 kfree(xp);
1533 return err;
1534 }
1535
1536 c.event = nlh->nlmsg_type;
1537 c.seq = nlh->nlmsg_seq;
1538 c.portid = nlh->nlmsg_pid;
1539 km_policy_notify(xp, p->dir, &c);
1540
1541 xfrm_pol_put(xp);
1542
1543 return 0;
1544 }
1545
1546 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1547 {
1548 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1549 int i;
1550
1551 if (xp->xfrm_nr == 0)
1552 return 0;
1553
1554 for (i = 0; i < xp->xfrm_nr; i++) {
1555 struct xfrm_user_tmpl *up = &vec[i];
1556 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1557
1558 memset(up, 0, sizeof(*up));
1559 memcpy(&up->id, &kp->id, sizeof(up->id));
1560 up->family = kp->encap_family;
1561 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1562 up->reqid = kp->reqid;
1563 up->mode = kp->mode;
1564 up->share = kp->share;
1565 up->optional = kp->optional;
1566 up->aalgos = kp->aalgos;
1567 up->ealgos = kp->ealgos;
1568 up->calgos = kp->calgos;
1569 }
1570
1571 return nla_put(skb, XFRMA_TMPL,
1572 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1573 }
1574
1575 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1576 {
1577 if (x->security) {
1578 return copy_sec_ctx(x->security, skb);
1579 }
1580 return 0;
1581 }
1582
1583 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1584 {
1585 if (xp->security)
1586 return copy_sec_ctx(xp->security, skb);
1587 return 0;
1588 }
1589 static inline size_t userpolicy_type_attrsize(void)
1590 {
1591 #ifdef CONFIG_XFRM_SUB_POLICY
1592 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1593 #else
1594 return 0;
1595 #endif
1596 }
1597
1598 #ifdef CONFIG_XFRM_SUB_POLICY
1599 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1600 {
1601 struct xfrm_userpolicy_type upt = {
1602 .type = type,
1603 };
1604
1605 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1606 }
1607
1608 #else
1609 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1610 {
1611 return 0;
1612 }
1613 #endif
1614
1615 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1616 {
1617 struct xfrm_dump_info *sp = ptr;
1618 struct xfrm_userpolicy_info *p;
1619 struct sk_buff *in_skb = sp->in_skb;
1620 struct sk_buff *skb = sp->out_skb;
1621 struct nlmsghdr *nlh;
1622 int err;
1623
1624 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1625 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1626 if (nlh == NULL)
1627 return -EMSGSIZE;
1628
1629 p = nlmsg_data(nlh);
1630 copy_to_user_policy(xp, p, dir);
1631 err = copy_to_user_tmpl(xp, skb);
1632 if (!err)
1633 err = copy_to_user_sec_ctx(xp, skb);
1634 if (!err)
1635 err = copy_to_user_policy_type(xp->type, skb);
1636 if (!err)
1637 err = xfrm_mark_put(skb, &xp->mark);
1638 if (err) {
1639 nlmsg_cancel(skb, nlh);
1640 return err;
1641 }
1642 nlmsg_end(skb, nlh);
1643 return 0;
1644 }
1645
1646 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1647 {
1648 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1649 struct net *net = sock_net(cb->skb->sk);
1650
1651 xfrm_policy_walk_done(walk, net);
1652 return 0;
1653 }
1654
1655 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1656 {
1657 struct net *net = sock_net(skb->sk);
1658 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1659 struct xfrm_dump_info info;
1660
1661 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1662 sizeof(cb->args) - sizeof(cb->args[0]));
1663
1664 info.in_skb = cb->skb;
1665 info.out_skb = skb;
1666 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1667 info.nlmsg_flags = NLM_F_MULTI;
1668
1669 if (!cb->args[0]) {
1670 cb->args[0] = 1;
1671 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1672 }
1673
1674 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1675
1676 return skb->len;
1677 }
1678
1679 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1680 struct xfrm_policy *xp,
1681 int dir, u32 seq)
1682 {
1683 struct xfrm_dump_info info;
1684 struct sk_buff *skb;
1685 int err;
1686
1687 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1688 if (!skb)
1689 return ERR_PTR(-ENOMEM);
1690
1691 info.in_skb = in_skb;
1692 info.out_skb = skb;
1693 info.nlmsg_seq = seq;
1694 info.nlmsg_flags = 0;
1695
1696 err = dump_one_policy(xp, dir, 0, &info);
1697 if (err) {
1698 kfree_skb(skb);
1699 return ERR_PTR(err);
1700 }
1701
1702 return skb;
1703 }
1704
1705 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1706 struct nlattr **attrs)
1707 {
1708 struct net *net = sock_net(skb->sk);
1709 struct xfrm_policy *xp;
1710 struct xfrm_userpolicy_id *p;
1711 u8 type = XFRM_POLICY_TYPE_MAIN;
1712 int err;
1713 struct km_event c;
1714 int delete;
1715 struct xfrm_mark m;
1716 u32 mark = xfrm_mark_get(attrs, &m);
1717
1718 p = nlmsg_data(nlh);
1719 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1720
1721 err = copy_from_user_policy_type(&type, attrs);
1722 if (err)
1723 return err;
1724
1725 err = verify_policy_dir(p->dir);
1726 if (err)
1727 return err;
1728
1729 if (p->index)
1730 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1731 else {
1732 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1733 struct xfrm_sec_ctx *ctx;
1734
1735 err = verify_sec_ctx_len(attrs);
1736 if (err)
1737 return err;
1738
1739 ctx = NULL;
1740 if (rt) {
1741 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1742
1743 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1744 if (err)
1745 return err;
1746 }
1747 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1748 ctx, delete, &err);
1749 security_xfrm_policy_free(ctx);
1750 }
1751 if (xp == NULL)
1752 return -ENOENT;
1753
1754 if (!delete) {
1755 struct sk_buff *resp_skb;
1756
1757 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1758 if (IS_ERR(resp_skb)) {
1759 err = PTR_ERR(resp_skb);
1760 } else {
1761 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1762 NETLINK_CB(skb).portid);
1763 }
1764 } else {
1765 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1766
1767 if (err != 0)
1768 goto out;
1769
1770 c.data.byid = p->index;
1771 c.event = nlh->nlmsg_type;
1772 c.seq = nlh->nlmsg_seq;
1773 c.portid = nlh->nlmsg_pid;
1774 km_policy_notify(xp, p->dir, &c);
1775 }
1776
1777 out:
1778 xfrm_pol_put(xp);
1779 if (delete && err == 0)
1780 xfrm_garbage_collect(net);
1781 return err;
1782 }
1783
1784 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1785 struct nlattr **attrs)
1786 {
1787 struct net *net = sock_net(skb->sk);
1788 struct km_event c;
1789 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1790 int err;
1791
1792 err = xfrm_state_flush(net, p->proto, true);
1793 if (err) {
1794 if (err == -ESRCH) /* empty table */
1795 return 0;
1796 return err;
1797 }
1798 c.data.proto = p->proto;
1799 c.event = nlh->nlmsg_type;
1800 c.seq = nlh->nlmsg_seq;
1801 c.portid = nlh->nlmsg_pid;
1802 c.net = net;
1803 km_state_notify(NULL, &c);
1804
1805 return 0;
1806 }
1807
1808 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1809 {
1810 size_t replay_size = x->replay_esn ?
1811 xfrm_replay_state_esn_len(x->replay_esn) :
1812 sizeof(struct xfrm_replay_state);
1813
1814 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1815 + nla_total_size(replay_size)
1816 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1817 + nla_total_size(sizeof(struct xfrm_mark))
1818 + nla_total_size(4) /* XFRM_AE_RTHR */
1819 + nla_total_size(4); /* XFRM_AE_ETHR */
1820 }
1821
1822 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1823 {
1824 struct xfrm_aevent_id *id;
1825 struct nlmsghdr *nlh;
1826 int err;
1827
1828 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1829 if (nlh == NULL)
1830 return -EMSGSIZE;
1831
1832 id = nlmsg_data(nlh);
1833 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1834 id->sa_id.spi = x->id.spi;
1835 id->sa_id.family = x->props.family;
1836 id->sa_id.proto = x->id.proto;
1837 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1838 id->reqid = x->props.reqid;
1839 id->flags = c->data.aevent;
1840
1841 if (x->replay_esn) {
1842 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1843 xfrm_replay_state_esn_len(x->replay_esn),
1844 x->replay_esn);
1845 } else {
1846 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1847 &x->replay);
1848 }
1849 if (err)
1850 goto out_cancel;
1851 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1852 if (err)
1853 goto out_cancel;
1854
1855 if (id->flags & XFRM_AE_RTHR) {
1856 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1857 if (err)
1858 goto out_cancel;
1859 }
1860 if (id->flags & XFRM_AE_ETHR) {
1861 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1862 x->replay_maxage * 10 / HZ);
1863 if (err)
1864 goto out_cancel;
1865 }
1866 err = xfrm_mark_put(skb, &x->mark);
1867 if (err)
1868 goto out_cancel;
1869
1870 nlmsg_end(skb, nlh);
1871 return 0;
1872
1873 out_cancel:
1874 nlmsg_cancel(skb, nlh);
1875 return err;
1876 }
1877
1878 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1879 struct nlattr **attrs)
1880 {
1881 struct net *net = sock_net(skb->sk);
1882 struct xfrm_state *x;
1883 struct sk_buff *r_skb;
1884 int err;
1885 struct km_event c;
1886 u32 mark;
1887 struct xfrm_mark m;
1888 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1889 struct xfrm_usersa_id *id = &p->sa_id;
1890
1891 mark = xfrm_mark_get(attrs, &m);
1892
1893 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1894 if (x == NULL)
1895 return -ESRCH;
1896
1897 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1898 if (r_skb == NULL) {
1899 xfrm_state_put(x);
1900 return -ENOMEM;
1901 }
1902
1903 /*
1904 * XXX: is this lock really needed - none of the other
1905 * gets lock (the concern is things getting updated
1906 * while we are still reading) - jhs
1907 */
1908 spin_lock_bh(&x->lock);
1909 c.data.aevent = p->flags;
1910 c.seq = nlh->nlmsg_seq;
1911 c.portid = nlh->nlmsg_pid;
1912
1913 if (build_aevent(r_skb, x, &c) < 0)
1914 BUG();
1915 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1916 spin_unlock_bh(&x->lock);
1917 xfrm_state_put(x);
1918 return err;
1919 }
1920
1921 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1922 struct nlattr **attrs)
1923 {
1924 struct net *net = sock_net(skb->sk);
1925 struct xfrm_state *x;
1926 struct km_event c;
1927 int err = -EINVAL;
1928 u32 mark = 0;
1929 struct xfrm_mark m;
1930 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1931 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1932 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1933 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1934 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1935 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
1936
1937 if (!lt && !rp && !re && !et && !rt)
1938 return err;
1939
1940 /* pedantic mode - thou shalt sayeth replaceth */
1941 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1942 return err;
1943
1944 mark = xfrm_mark_get(attrs, &m);
1945
1946 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1947 if (x == NULL)
1948 return -ESRCH;
1949
1950 if (x->km.state != XFRM_STATE_VALID)
1951 goto out;
1952
1953 err = xfrm_replay_verify_len(x->replay_esn, re);
1954 if (err)
1955 goto out;
1956
1957 spin_lock_bh(&x->lock);
1958 xfrm_update_ae_params(x, attrs, 1);
1959 spin_unlock_bh(&x->lock);
1960
1961 c.event = nlh->nlmsg_type;
1962 c.seq = nlh->nlmsg_seq;
1963 c.portid = nlh->nlmsg_pid;
1964 c.data.aevent = XFRM_AE_CU;
1965 km_state_notify(x, &c);
1966 err = 0;
1967 out:
1968 xfrm_state_put(x);
1969 return err;
1970 }
1971
1972 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1973 struct nlattr **attrs)
1974 {
1975 struct net *net = sock_net(skb->sk);
1976 struct km_event c;
1977 u8 type = XFRM_POLICY_TYPE_MAIN;
1978 int err;
1979
1980 err = copy_from_user_policy_type(&type, attrs);
1981 if (err)
1982 return err;
1983
1984 err = xfrm_policy_flush(net, type, true);
1985 if (err) {
1986 if (err == -ESRCH) /* empty table */
1987 return 0;
1988 return err;
1989 }
1990
1991 c.data.type = type;
1992 c.event = nlh->nlmsg_type;
1993 c.seq = nlh->nlmsg_seq;
1994 c.portid = nlh->nlmsg_pid;
1995 c.net = net;
1996 km_policy_notify(NULL, 0, &c);
1997 return 0;
1998 }
1999
2000 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2001 struct nlattr **attrs)
2002 {
2003 struct net *net = sock_net(skb->sk);
2004 struct xfrm_policy *xp;
2005 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2006 struct xfrm_userpolicy_info *p = &up->pol;
2007 u8 type = XFRM_POLICY_TYPE_MAIN;
2008 int err = -ENOENT;
2009 struct xfrm_mark m;
2010 u32 mark = xfrm_mark_get(attrs, &m);
2011
2012 err = copy_from_user_policy_type(&type, attrs);
2013 if (err)
2014 return err;
2015
2016 err = verify_policy_dir(p->dir);
2017 if (err)
2018 return err;
2019
2020 if (p->index)
2021 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2022 else {
2023 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2024 struct xfrm_sec_ctx *ctx;
2025
2026 err = verify_sec_ctx_len(attrs);
2027 if (err)
2028 return err;
2029
2030 ctx = NULL;
2031 if (rt) {
2032 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2033
2034 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2035 if (err)
2036 return err;
2037 }
2038 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2039 &p->sel, ctx, 0, &err);
2040 security_xfrm_policy_free(ctx);
2041 }
2042 if (xp == NULL)
2043 return -ENOENT;
2044
2045 if (unlikely(xp->walk.dead))
2046 goto out;
2047
2048 err = 0;
2049 if (up->hard) {
2050 xfrm_policy_delete(xp, p->dir);
2051 xfrm_audit_policy_delete(xp, 1, true);
2052 } else {
2053 // reset the timers here?
2054 WARN(1, "Don't know what to do with soft policy expire\n");
2055 }
2056 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2057
2058 out:
2059 xfrm_pol_put(xp);
2060 return err;
2061 }
2062
2063 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2064 struct nlattr **attrs)
2065 {
2066 struct net *net = sock_net(skb->sk);
2067 struct xfrm_state *x;
2068 int err;
2069 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2070 struct xfrm_usersa_info *p = &ue->state;
2071 struct xfrm_mark m;
2072 u32 mark = xfrm_mark_get(attrs, &m);
2073
2074 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2075
2076 err = -ENOENT;
2077 if (x == NULL)
2078 return err;
2079
2080 spin_lock_bh(&x->lock);
2081 err = -EINVAL;
2082 if (x->km.state != XFRM_STATE_VALID)
2083 goto out;
2084 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2085
2086 if (ue->hard) {
2087 __xfrm_state_delete(x);
2088 xfrm_audit_state_delete(x, 1, true);
2089 }
2090 err = 0;
2091 out:
2092 spin_unlock_bh(&x->lock);
2093 xfrm_state_put(x);
2094 return err;
2095 }
2096
2097 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2098 struct nlattr **attrs)
2099 {
2100 struct net *net = sock_net(skb->sk);
2101 struct xfrm_policy *xp;
2102 struct xfrm_user_tmpl *ut;
2103 int i;
2104 struct nlattr *rt = attrs[XFRMA_TMPL];
2105 struct xfrm_mark mark;
2106
2107 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2108 struct xfrm_state *x = xfrm_state_alloc(net);
2109 int err = -ENOMEM;
2110
2111 if (!x)
2112 goto nomem;
2113
2114 xfrm_mark_get(attrs, &mark);
2115
2116 err = verify_newpolicy_info(&ua->policy);
2117 if (err)
2118 goto bad_policy;
2119
2120 /* build an XP */
2121 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2122 if (!xp)
2123 goto free_state;
2124
2125 memcpy(&x->id, &ua->id, sizeof(ua->id));
2126 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2127 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2128 xp->mark.m = x->mark.m = mark.m;
2129 xp->mark.v = x->mark.v = mark.v;
2130 ut = nla_data(rt);
2131 /* extract the templates and for each call km_key */
2132 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2133 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2134 memcpy(&x->id, &t->id, sizeof(x->id));
2135 x->props.mode = t->mode;
2136 x->props.reqid = t->reqid;
2137 x->props.family = ut->family;
2138 t->aalgos = ua->aalgos;
2139 t->ealgos = ua->ealgos;
2140 t->calgos = ua->calgos;
2141 err = km_query(x, t, xp);
2142
2143 }
2144
2145 kfree(x);
2146 kfree(xp);
2147
2148 return 0;
2149
2150 bad_policy:
2151 WARN(1, "BAD policy passed\n");
2152 free_state:
2153 kfree(x);
2154 nomem:
2155 return err;
2156 }
2157
2158 #ifdef CONFIG_XFRM_MIGRATE
2159 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2160 struct xfrm_kmaddress *k,
2161 struct nlattr **attrs, int *num)
2162 {
2163 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2164 struct xfrm_user_migrate *um;
2165 int i, num_migrate;
2166
2167 if (k != NULL) {
2168 struct xfrm_user_kmaddress *uk;
2169
2170 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2171 memcpy(&k->local, &uk->local, sizeof(k->local));
2172 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2173 k->family = uk->family;
2174 k->reserved = uk->reserved;
2175 }
2176
2177 um = nla_data(rt);
2178 num_migrate = nla_len(rt) / sizeof(*um);
2179
2180 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2181 return -EINVAL;
2182
2183 for (i = 0; i < num_migrate; i++, um++, ma++) {
2184 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2185 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2186 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2187 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2188
2189 ma->proto = um->proto;
2190 ma->mode = um->mode;
2191 ma->reqid = um->reqid;
2192
2193 ma->old_family = um->old_family;
2194 ma->new_family = um->new_family;
2195 }
2196
2197 *num = i;
2198 return 0;
2199 }
2200
2201 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2202 struct nlattr **attrs)
2203 {
2204 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2205 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2206 struct xfrm_kmaddress km, *kmp;
2207 u8 type;
2208 int err;
2209 int n = 0;
2210 struct net *net = sock_net(skb->sk);
2211
2212 if (attrs[XFRMA_MIGRATE] == NULL)
2213 return -EINVAL;
2214
2215 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2216
2217 err = copy_from_user_policy_type(&type, attrs);
2218 if (err)
2219 return err;
2220
2221 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2222 if (err)
2223 return err;
2224
2225 if (!n)
2226 return 0;
2227
2228 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2229
2230 return 0;
2231 }
2232 #else
2233 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2234 struct nlattr **attrs)
2235 {
2236 return -ENOPROTOOPT;
2237 }
2238 #endif
2239
2240 #ifdef CONFIG_XFRM_MIGRATE
2241 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2242 {
2243 struct xfrm_user_migrate um;
2244
2245 memset(&um, 0, sizeof(um));
2246 um.proto = m->proto;
2247 um.mode = m->mode;
2248 um.reqid = m->reqid;
2249 um.old_family = m->old_family;
2250 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2251 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2252 um.new_family = m->new_family;
2253 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2254 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2255
2256 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2257 }
2258
2259 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2260 {
2261 struct xfrm_user_kmaddress uk;
2262
2263 memset(&uk, 0, sizeof(uk));
2264 uk.family = k->family;
2265 uk.reserved = k->reserved;
2266 memcpy(&uk.local, &k->local, sizeof(uk.local));
2267 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2268
2269 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2270 }
2271
2272 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2273 {
2274 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2275 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2276 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2277 + userpolicy_type_attrsize();
2278 }
2279
2280 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2281 int num_migrate, const struct xfrm_kmaddress *k,
2282 const struct xfrm_selector *sel, u8 dir, u8 type)
2283 {
2284 const struct xfrm_migrate *mp;
2285 struct xfrm_userpolicy_id *pol_id;
2286 struct nlmsghdr *nlh;
2287 int i, err;
2288
2289 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2290 if (nlh == NULL)
2291 return -EMSGSIZE;
2292
2293 pol_id = nlmsg_data(nlh);
2294 /* copy data from selector, dir, and type to the pol_id */
2295 memset(pol_id, 0, sizeof(*pol_id));
2296 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2297 pol_id->dir = dir;
2298
2299 if (k != NULL) {
2300 err = copy_to_user_kmaddress(k, skb);
2301 if (err)
2302 goto out_cancel;
2303 }
2304 err = copy_to_user_policy_type(type, skb);
2305 if (err)
2306 goto out_cancel;
2307 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2308 err = copy_to_user_migrate(mp, skb);
2309 if (err)
2310 goto out_cancel;
2311 }
2312
2313 nlmsg_end(skb, nlh);
2314 return 0;
2315
2316 out_cancel:
2317 nlmsg_cancel(skb, nlh);
2318 return err;
2319 }
2320
2321 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2322 const struct xfrm_migrate *m, int num_migrate,
2323 const struct xfrm_kmaddress *k)
2324 {
2325 struct net *net = &init_net;
2326 struct sk_buff *skb;
2327
2328 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2329 if (skb == NULL)
2330 return -ENOMEM;
2331
2332 /* build migrate */
2333 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2334 BUG();
2335
2336 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2337 }
2338 #else
2339 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2340 const struct xfrm_migrate *m, int num_migrate,
2341 const struct xfrm_kmaddress *k)
2342 {
2343 return -ENOPROTOOPT;
2344 }
2345 #endif
2346
2347 #define XMSGSIZE(type) sizeof(struct type)
2348
2349 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2350 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2351 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2352 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2353 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2354 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2355 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2356 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2357 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2358 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2359 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2360 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2361 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2362 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2363 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2364 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2365 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2366 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2367 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2368 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2369 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2370 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2371 };
2372
2373 #undef XMSGSIZE
2374
2375 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2376 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2377 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2378 [XFRMA_LASTUSED] = { .type = NLA_U64},
2379 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2380 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2381 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2382 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2383 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2384 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2385 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2386 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2387 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2388 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2389 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2390 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2391 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2392 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2393 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2394 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2395 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2396 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2397 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2398 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2399 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2400 [XFRMA_PROTO] = { .type = NLA_U8 },
2401 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2402 };
2403
2404 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2405 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2406 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2407 };
2408
2409 static const struct xfrm_link {
2410 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2411 int (*dump)(struct sk_buff *, struct netlink_callback *);
2412 int (*done)(struct netlink_callback *);
2413 const struct nla_policy *nla_pol;
2414 int nla_max;
2415 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2416 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2417 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2418 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2419 .dump = xfrm_dump_sa,
2420 .done = xfrm_dump_sa_done },
2421 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2422 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2423 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2424 .dump = xfrm_dump_policy,
2425 .done = xfrm_dump_policy_done },
2426 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2427 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2428 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2429 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2430 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2431 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2432 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2433 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2434 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2435 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2436 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2437 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2438 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2439 .nla_pol = xfrma_spd_policy,
2440 .nla_max = XFRMA_SPD_MAX },
2441 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2442 };
2443
2444 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2445 {
2446 struct net *net = sock_net(skb->sk);
2447 struct nlattr *attrs[XFRMA_MAX+1];
2448 const struct xfrm_link *link;
2449 int type, err;
2450
2451 #ifdef CONFIG_COMPAT
2452 if (in_compat_syscall())
2453 return -ENOTSUPP;
2454 #endif
2455
2456 type = nlh->nlmsg_type;
2457 if (type > XFRM_MSG_MAX)
2458 return -EINVAL;
2459
2460 type -= XFRM_MSG_BASE;
2461 link = &xfrm_dispatch[type];
2462
2463 /* All operations require privileges, even GET */
2464 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2465 return -EPERM;
2466
2467 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2468 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2469 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2470 if (link->dump == NULL)
2471 return -EINVAL;
2472
2473 {
2474 struct netlink_dump_control c = {
2475 .dump = link->dump,
2476 .done = link->done,
2477 };
2478 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2479 }
2480 }
2481
2482 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2483 link->nla_max ? : XFRMA_MAX,
2484 link->nla_pol ? : xfrma_policy);
2485 if (err < 0)
2486 return err;
2487
2488 if (link->doit == NULL)
2489 return -EINVAL;
2490
2491 return link->doit(skb, nlh, attrs);
2492 }
2493
2494 static void xfrm_netlink_rcv(struct sk_buff *skb)
2495 {
2496 struct net *net = sock_net(skb->sk);
2497
2498 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2499 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2500 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2501 }
2502
2503 static inline size_t xfrm_expire_msgsize(void)
2504 {
2505 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2506 + nla_total_size(sizeof(struct xfrm_mark));
2507 }
2508
2509 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2510 {
2511 struct xfrm_user_expire *ue;
2512 struct nlmsghdr *nlh;
2513 int err;
2514
2515 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2516 if (nlh == NULL)
2517 return -EMSGSIZE;
2518
2519 ue = nlmsg_data(nlh);
2520 copy_to_user_state(x, &ue->state);
2521 ue->hard = (c->data.hard != 0) ? 1 : 0;
2522
2523 err = xfrm_mark_put(skb, &x->mark);
2524 if (err)
2525 return err;
2526
2527 nlmsg_end(skb, nlh);
2528 return 0;
2529 }
2530
2531 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2532 {
2533 struct net *net = xs_net(x);
2534 struct sk_buff *skb;
2535
2536 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2537 if (skb == NULL)
2538 return -ENOMEM;
2539
2540 if (build_expire(skb, x, c) < 0) {
2541 kfree_skb(skb);
2542 return -EMSGSIZE;
2543 }
2544
2545 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2546 }
2547
2548 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2549 {
2550 struct net *net = xs_net(x);
2551 struct sk_buff *skb;
2552
2553 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2554 if (skb == NULL)
2555 return -ENOMEM;
2556
2557 if (build_aevent(skb, x, c) < 0)
2558 BUG();
2559
2560 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2561 }
2562
2563 static int xfrm_notify_sa_flush(const struct km_event *c)
2564 {
2565 struct net *net = c->net;
2566 struct xfrm_usersa_flush *p;
2567 struct nlmsghdr *nlh;
2568 struct sk_buff *skb;
2569 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2570
2571 skb = nlmsg_new(len, GFP_ATOMIC);
2572 if (skb == NULL)
2573 return -ENOMEM;
2574
2575 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2576 if (nlh == NULL) {
2577 kfree_skb(skb);
2578 return -EMSGSIZE;
2579 }
2580
2581 p = nlmsg_data(nlh);
2582 p->proto = c->data.proto;
2583
2584 nlmsg_end(skb, nlh);
2585
2586 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2587 }
2588
2589 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2590 {
2591 size_t l = 0;
2592 if (x->aead)
2593 l += nla_total_size(aead_len(x->aead));
2594 if (x->aalg) {
2595 l += nla_total_size(sizeof(struct xfrm_algo) +
2596 (x->aalg->alg_key_len + 7) / 8);
2597 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2598 }
2599 if (x->ealg)
2600 l += nla_total_size(xfrm_alg_len(x->ealg));
2601 if (x->calg)
2602 l += nla_total_size(sizeof(*x->calg));
2603 if (x->encap)
2604 l += nla_total_size(sizeof(*x->encap));
2605 if (x->tfcpad)
2606 l += nla_total_size(sizeof(x->tfcpad));
2607 if (x->replay_esn)
2608 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2609 else
2610 l += nla_total_size(sizeof(struct xfrm_replay_state));
2611 if (x->security)
2612 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2613 x->security->ctx_len);
2614 if (x->coaddr)
2615 l += nla_total_size(sizeof(*x->coaddr));
2616 if (x->props.extra_flags)
2617 l += nla_total_size(sizeof(x->props.extra_flags));
2618
2619 /* Must count x->lastused as it may become non-zero behind our back. */
2620 l += nla_total_size(sizeof(u64));
2621
2622 return l;
2623 }
2624
2625 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2626 {
2627 struct net *net = xs_net(x);
2628 struct xfrm_usersa_info *p;
2629 struct xfrm_usersa_id *id;
2630 struct nlmsghdr *nlh;
2631 struct sk_buff *skb;
2632 int len = xfrm_sa_len(x);
2633 int headlen, err;
2634
2635 headlen = sizeof(*p);
2636 if (c->event == XFRM_MSG_DELSA) {
2637 len += nla_total_size(headlen);
2638 headlen = sizeof(*id);
2639 len += nla_total_size(sizeof(struct xfrm_mark));
2640 }
2641 len += NLMSG_ALIGN(headlen);
2642
2643 skb = nlmsg_new(len, GFP_ATOMIC);
2644 if (skb == NULL)
2645 return -ENOMEM;
2646
2647 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2648 err = -EMSGSIZE;
2649 if (nlh == NULL)
2650 goto out_free_skb;
2651
2652 p = nlmsg_data(nlh);
2653 if (c->event == XFRM_MSG_DELSA) {
2654 struct nlattr *attr;
2655
2656 id = nlmsg_data(nlh);
2657 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2658 id->spi = x->id.spi;
2659 id->family = x->props.family;
2660 id->proto = x->id.proto;
2661
2662 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2663 err = -EMSGSIZE;
2664 if (attr == NULL)
2665 goto out_free_skb;
2666
2667 p = nla_data(attr);
2668 }
2669 err = copy_to_user_state_extra(x, p, skb);
2670 if (err)
2671 goto out_free_skb;
2672
2673 nlmsg_end(skb, nlh);
2674
2675 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2676
2677 out_free_skb:
2678 kfree_skb(skb);
2679 return err;
2680 }
2681
2682 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2683 {
2684
2685 switch (c->event) {
2686 case XFRM_MSG_EXPIRE:
2687 return xfrm_exp_state_notify(x, c);
2688 case XFRM_MSG_NEWAE:
2689 return xfrm_aevent_state_notify(x, c);
2690 case XFRM_MSG_DELSA:
2691 case XFRM_MSG_UPDSA:
2692 case XFRM_MSG_NEWSA:
2693 return xfrm_notify_sa(x, c);
2694 case XFRM_MSG_FLUSHSA:
2695 return xfrm_notify_sa_flush(c);
2696 default:
2697 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2698 c->event);
2699 break;
2700 }
2701
2702 return 0;
2703
2704 }
2705
2706 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2707 struct xfrm_policy *xp)
2708 {
2709 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2710 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2711 + nla_total_size(sizeof(struct xfrm_mark))
2712 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2713 + userpolicy_type_attrsize();
2714 }
2715
2716 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2717 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2718 {
2719 __u32 seq = xfrm_get_acqseq();
2720 struct xfrm_user_acquire *ua;
2721 struct nlmsghdr *nlh;
2722 int err;
2723
2724 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2725 if (nlh == NULL)
2726 return -EMSGSIZE;
2727
2728 ua = nlmsg_data(nlh);
2729 memcpy(&ua->id, &x->id, sizeof(ua->id));
2730 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2731 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2732 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2733 ua->aalgos = xt->aalgos;
2734 ua->ealgos = xt->ealgos;
2735 ua->calgos = xt->calgos;
2736 ua->seq = x->km.seq = seq;
2737
2738 err = copy_to_user_tmpl(xp, skb);
2739 if (!err)
2740 err = copy_to_user_state_sec_ctx(x, skb);
2741 if (!err)
2742 err = copy_to_user_policy_type(xp->type, skb);
2743 if (!err)
2744 err = xfrm_mark_put(skb, &xp->mark);
2745 if (err) {
2746 nlmsg_cancel(skb, nlh);
2747 return err;
2748 }
2749
2750 nlmsg_end(skb, nlh);
2751 return 0;
2752 }
2753
2754 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2755 struct xfrm_policy *xp)
2756 {
2757 struct net *net = xs_net(x);
2758 struct sk_buff *skb;
2759
2760 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2761 if (skb == NULL)
2762 return -ENOMEM;
2763
2764 if (build_acquire(skb, x, xt, xp) < 0)
2765 BUG();
2766
2767 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2768 }
2769
2770 /* User gives us xfrm_user_policy_info followed by an array of 0
2771 * or more templates.
2772 */
2773 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2774 u8 *data, int len, int *dir)
2775 {
2776 struct net *net = sock_net(sk);
2777 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2778 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2779 struct xfrm_policy *xp;
2780 int nr;
2781
2782 switch (sk->sk_family) {
2783 case AF_INET:
2784 if (opt != IP_XFRM_POLICY) {
2785 *dir = -EOPNOTSUPP;
2786 return NULL;
2787 }
2788 break;
2789 #if IS_ENABLED(CONFIG_IPV6)
2790 case AF_INET6:
2791 if (opt != IPV6_XFRM_POLICY) {
2792 *dir = -EOPNOTSUPP;
2793 return NULL;
2794 }
2795 break;
2796 #endif
2797 default:
2798 *dir = -EINVAL;
2799 return NULL;
2800 }
2801
2802 *dir = -EINVAL;
2803
2804 if (len < sizeof(*p) ||
2805 verify_newpolicy_info(p))
2806 return NULL;
2807
2808 nr = ((len - sizeof(*p)) / sizeof(*ut));
2809 if (validate_tmpl(nr, ut, p->sel.family))
2810 return NULL;
2811
2812 if (p->dir > XFRM_POLICY_OUT)
2813 return NULL;
2814
2815 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2816 if (xp == NULL) {
2817 *dir = -ENOBUFS;
2818 return NULL;
2819 }
2820
2821 copy_from_user_policy(xp, p);
2822 xp->type = XFRM_POLICY_TYPE_MAIN;
2823 copy_templates(xp, ut, nr);
2824
2825 *dir = p->dir;
2826
2827 return xp;
2828 }
2829
2830 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2831 {
2832 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2833 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2834 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2835 + nla_total_size(sizeof(struct xfrm_mark))
2836 + userpolicy_type_attrsize();
2837 }
2838
2839 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2840 int dir, const struct km_event *c)
2841 {
2842 struct xfrm_user_polexpire *upe;
2843 int hard = c->data.hard;
2844 struct nlmsghdr *nlh;
2845 int err;
2846
2847 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2848 if (nlh == NULL)
2849 return -EMSGSIZE;
2850
2851 upe = nlmsg_data(nlh);
2852 copy_to_user_policy(xp, &upe->pol, dir);
2853 err = copy_to_user_tmpl(xp, skb);
2854 if (!err)
2855 err = copy_to_user_sec_ctx(xp, skb);
2856 if (!err)
2857 err = copy_to_user_policy_type(xp->type, skb);
2858 if (!err)
2859 err = xfrm_mark_put(skb, &xp->mark);
2860 if (err) {
2861 nlmsg_cancel(skb, nlh);
2862 return err;
2863 }
2864 upe->hard = !!hard;
2865
2866 nlmsg_end(skb, nlh);
2867 return 0;
2868 }
2869
2870 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2871 {
2872 struct net *net = xp_net(xp);
2873 struct sk_buff *skb;
2874
2875 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2876 if (skb == NULL)
2877 return -ENOMEM;
2878
2879 if (build_polexpire(skb, xp, dir, c) < 0)
2880 BUG();
2881
2882 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2883 }
2884
2885 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2886 {
2887 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2888 struct net *net = xp_net(xp);
2889 struct xfrm_userpolicy_info *p;
2890 struct xfrm_userpolicy_id *id;
2891 struct nlmsghdr *nlh;
2892 struct sk_buff *skb;
2893 int headlen, err;
2894
2895 headlen = sizeof(*p);
2896 if (c->event == XFRM_MSG_DELPOLICY) {
2897 len += nla_total_size(headlen);
2898 headlen = sizeof(*id);
2899 }
2900 len += userpolicy_type_attrsize();
2901 len += nla_total_size(sizeof(struct xfrm_mark));
2902 len += NLMSG_ALIGN(headlen);
2903
2904 skb = nlmsg_new(len, GFP_ATOMIC);
2905 if (skb == NULL)
2906 return -ENOMEM;
2907
2908 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2909 err = -EMSGSIZE;
2910 if (nlh == NULL)
2911 goto out_free_skb;
2912
2913 p = nlmsg_data(nlh);
2914 if (c->event == XFRM_MSG_DELPOLICY) {
2915 struct nlattr *attr;
2916
2917 id = nlmsg_data(nlh);
2918 memset(id, 0, sizeof(*id));
2919 id->dir = dir;
2920 if (c->data.byid)
2921 id->index = xp->index;
2922 else
2923 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2924
2925 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2926 err = -EMSGSIZE;
2927 if (attr == NULL)
2928 goto out_free_skb;
2929
2930 p = nla_data(attr);
2931 }
2932
2933 copy_to_user_policy(xp, p, dir);
2934 err = copy_to_user_tmpl(xp, skb);
2935 if (!err)
2936 err = copy_to_user_policy_type(xp->type, skb);
2937 if (!err)
2938 err = xfrm_mark_put(skb, &xp->mark);
2939 if (err)
2940 goto out_free_skb;
2941
2942 nlmsg_end(skb, nlh);
2943
2944 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2945
2946 out_free_skb:
2947 kfree_skb(skb);
2948 return err;
2949 }
2950
2951 static int xfrm_notify_policy_flush(const struct km_event *c)
2952 {
2953 struct net *net = c->net;
2954 struct nlmsghdr *nlh;
2955 struct sk_buff *skb;
2956 int err;
2957
2958 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2959 if (skb == NULL)
2960 return -ENOMEM;
2961
2962 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2963 err = -EMSGSIZE;
2964 if (nlh == NULL)
2965 goto out_free_skb;
2966 err = copy_to_user_policy_type(c->data.type, skb);
2967 if (err)
2968 goto out_free_skb;
2969
2970 nlmsg_end(skb, nlh);
2971
2972 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2973
2974 out_free_skb:
2975 kfree_skb(skb);
2976 return err;
2977 }
2978
2979 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2980 {
2981
2982 switch (c->event) {
2983 case XFRM_MSG_NEWPOLICY:
2984 case XFRM_MSG_UPDPOLICY:
2985 case XFRM_MSG_DELPOLICY:
2986 return xfrm_notify_policy(xp, dir, c);
2987 case XFRM_MSG_FLUSHPOLICY:
2988 return xfrm_notify_policy_flush(c);
2989 case XFRM_MSG_POLEXPIRE:
2990 return xfrm_exp_policy_notify(xp, dir, c);
2991 default:
2992 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2993 c->event);
2994 }
2995
2996 return 0;
2997
2998 }
2999
3000 static inline size_t xfrm_report_msgsize(void)
3001 {
3002 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3003 }
3004
3005 static int build_report(struct sk_buff *skb, u8 proto,
3006 struct xfrm_selector *sel, xfrm_address_t *addr)
3007 {
3008 struct xfrm_user_report *ur;
3009 struct nlmsghdr *nlh;
3010
3011 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3012 if (nlh == NULL)
3013 return -EMSGSIZE;
3014
3015 ur = nlmsg_data(nlh);
3016 ur->proto = proto;
3017 memcpy(&ur->sel, sel, sizeof(ur->sel));
3018
3019 if (addr) {
3020 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3021 if (err) {
3022 nlmsg_cancel(skb, nlh);
3023 return err;
3024 }
3025 }
3026 nlmsg_end(skb, nlh);
3027 return 0;
3028 }
3029
3030 static int xfrm_send_report(struct net *net, u8 proto,
3031 struct xfrm_selector *sel, xfrm_address_t *addr)
3032 {
3033 struct sk_buff *skb;
3034
3035 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3036 if (skb == NULL)
3037 return -ENOMEM;
3038
3039 if (build_report(skb, proto, sel, addr) < 0)
3040 BUG();
3041
3042 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3043 }
3044
3045 static inline size_t xfrm_mapping_msgsize(void)
3046 {
3047 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3048 }
3049
3050 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3051 xfrm_address_t *new_saddr, __be16 new_sport)
3052 {
3053 struct xfrm_user_mapping *um;
3054 struct nlmsghdr *nlh;
3055
3056 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3057 if (nlh == NULL)
3058 return -EMSGSIZE;
3059
3060 um = nlmsg_data(nlh);
3061
3062 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3063 um->id.spi = x->id.spi;
3064 um->id.family = x->props.family;
3065 um->id.proto = x->id.proto;
3066 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3067 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3068 um->new_sport = new_sport;
3069 um->old_sport = x->encap->encap_sport;
3070 um->reqid = x->props.reqid;
3071
3072 nlmsg_end(skb, nlh);
3073 return 0;
3074 }
3075
3076 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3077 __be16 sport)
3078 {
3079 struct net *net = xs_net(x);
3080 struct sk_buff *skb;
3081
3082 if (x->id.proto != IPPROTO_ESP)
3083 return -EINVAL;
3084
3085 if (!x->encap)
3086 return -EINVAL;
3087
3088 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3089 if (skb == NULL)
3090 return -ENOMEM;
3091
3092 if (build_mapping(skb, x, ipaddr, sport) < 0)
3093 BUG();
3094
3095 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3096 }
3097
3098 static bool xfrm_is_alive(const struct km_event *c)
3099 {
3100 return (bool)xfrm_acquire_is_on(c->net);
3101 }
3102
3103 static struct xfrm_mgr netlink_mgr = {
3104 .id = "netlink",
3105 .notify = xfrm_send_state_notify,
3106 .acquire = xfrm_send_acquire,
3107 .compile_policy = xfrm_compile_policy,
3108 .notify_policy = xfrm_send_policy_notify,
3109 .report = xfrm_send_report,
3110 .migrate = xfrm_send_migrate,
3111 .new_mapping = xfrm_send_mapping,
3112 .is_alive = xfrm_is_alive,
3113 };
3114
3115 static int __net_init xfrm_user_net_init(struct net *net)
3116 {
3117 struct sock *nlsk;
3118 struct netlink_kernel_cfg cfg = {
3119 .groups = XFRMNLGRP_MAX,
3120 .input = xfrm_netlink_rcv,
3121 };
3122
3123 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3124 if (nlsk == NULL)
3125 return -ENOMEM;
3126 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3127 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3128 return 0;
3129 }
3130
3131 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3132 {
3133 struct net *net;
3134 list_for_each_entry(net, net_exit_list, exit_list)
3135 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3136 synchronize_net();
3137 list_for_each_entry(net, net_exit_list, exit_list)
3138 netlink_kernel_release(net->xfrm.nlsk_stash);
3139 }
3140
3141 static struct pernet_operations xfrm_user_net_ops = {
3142 .init = xfrm_user_net_init,
3143 .exit_batch = xfrm_user_net_exit,
3144 };
3145
3146 static int __init xfrm_user_init(void)
3147 {
3148 int rv;
3149
3150 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3151
3152 rv = register_pernet_subsys(&xfrm_user_net_ops);
3153 if (rv < 0)
3154 return rv;
3155 rv = xfrm_register_km(&netlink_mgr);
3156 if (rv < 0)
3157 unregister_pernet_subsys(&xfrm_user_net_ops);
3158 return rv;
3159 }
3160
3161 static void __exit xfrm_user_exit(void)
3162 {
3163 xfrm_unregister_km(&netlink_mgr);
3164 unregister_pernet_subsys(&xfrm_user_net_ops);
3165 }
3166
3167 module_init(xfrm_user_init);
3168 module_exit(xfrm_user_exit);
3169 MODULE_LICENSE("GPL");
3170 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3171
Linux with added FPC-III support