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Merge git://git.infradead.org/users/willy/linux-nvme
[linux-2.6/cjktty.git] / net / xfrm / xfrm_user.c
blobfbd9e6cd0fd7a1297d99b48c37cc6de8ce938bbf
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
35 static inline int aead_len(struct xfrm_algo_aead *alg)
36 {
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38 }
39
40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
41 {
42 struct nlattr *rt = attrs[type];
43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
48 algp = nla_data(rt);
49 if (nla_len(rt) < xfrm_alg_len(algp))
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 case XFRMA_ALG_CRYPT:
55 case XFRMA_ALG_COMP:
56 break;
57
58 default:
59 return -EINVAL;
60 }
61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64 }
65
66 static int verify_auth_trunc(struct nlattr **attrs)
67 {
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80 }
81
82 static int verify_aead(struct nlattr **attrs)
83 {
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96 }
97
98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
99 xfrm_address_t **addrp)
100 {
101 struct nlattr *rt = attrs[type];
102
103 if (rt && addrp)
104 *addrp = nla_data(rt);
105 }
106
107 static inline int verify_sec_ctx_len(struct nlattr **attrs)
108 {
109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
110 struct xfrm_user_sec_ctx *uctx;
111
112 if (!rt)
113 return 0;
114
115 uctx = nla_data(rt);
116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
117 return -EINVAL;
118
119 return 0;
120 }
121
122 static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124 {
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126 struct xfrm_replay_state_esn *rs;
127
128 if (p->flags & XFRM_STATE_ESN) {
129 if (!rt)
130 return -EINVAL;
131
132 rs = nla_data(rt);
133
134 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
135 return -EINVAL;
136
137 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
138 nla_len(rt) != sizeof(*rs))
139 return -EINVAL;
140 }
141
142 if (!rt)
143 return 0;
144
145 if (p->id.proto != IPPROTO_ESP)
146 return -EINVAL;
147
148 if (p->replay_window != 0)
149 return -EINVAL;
150
151 return 0;
152 }
153
154 static int verify_newsa_info(struct xfrm_usersa_info *p,
155 struct nlattr **attrs)
156 {
157 int err;
158
159 err = -EINVAL;
160 switch (p->family) {
161 case AF_INET:
162 break;
163
164 case AF_INET6:
165 #if IS_ENABLED(CONFIG_IPV6)
166 break;
167 #else
168 err = -EAFNOSUPPORT;
169 goto out;
170 #endif
171
172 default:
173 goto out;
174 }
175
176 err = -EINVAL;
177 switch (p->id.proto) {
178 case IPPROTO_AH:
179 if ((!attrs[XFRMA_ALG_AUTH] &&
180 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
181 attrs[XFRMA_ALG_AEAD] ||
182 attrs[XFRMA_ALG_CRYPT] ||
183 attrs[XFRMA_ALG_COMP] ||
184 attrs[XFRMA_TFCPAD])
185 goto out;
186 break;
187
188 case IPPROTO_ESP:
189 if (attrs[XFRMA_ALG_COMP])
190 goto out;
191 if (!attrs[XFRMA_ALG_AUTH] &&
192 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
193 !attrs[XFRMA_ALG_CRYPT] &&
194 !attrs[XFRMA_ALG_AEAD])
195 goto out;
196 if ((attrs[XFRMA_ALG_AUTH] ||
197 attrs[XFRMA_ALG_AUTH_TRUNC] ||
198 attrs[XFRMA_ALG_CRYPT]) &&
199 attrs[XFRMA_ALG_AEAD])
200 goto out;
201 if (attrs[XFRMA_TFCPAD] &&
202 p->mode != XFRM_MODE_TUNNEL)
203 goto out;
204 break;
205
206 case IPPROTO_COMP:
207 if (!attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AEAD] ||
209 attrs[XFRMA_ALG_AUTH] ||
210 attrs[XFRMA_ALG_AUTH_TRUNC] ||
211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_TFCPAD])
213 goto out;
214 break;
215
216 #if IS_ENABLED(CONFIG_IPV6)
217 case IPPROTO_DSTOPTS:
218 case IPPROTO_ROUTING:
219 if (attrs[XFRMA_ALG_COMP] ||
220 attrs[XFRMA_ALG_AUTH] ||
221 attrs[XFRMA_ALG_AUTH_TRUNC] ||
222 attrs[XFRMA_ALG_AEAD] ||
223 attrs[XFRMA_ALG_CRYPT] ||
224 attrs[XFRMA_ENCAP] ||
225 attrs[XFRMA_SEC_CTX] ||
226 attrs[XFRMA_TFCPAD] ||
227 !attrs[XFRMA_COADDR])
228 goto out;
229 break;
230 #endif
231
232 default:
233 goto out;
234 }
235
236 if ((err = verify_aead(attrs)))
237 goto out;
238 if ((err = verify_auth_trunc(attrs)))
239 goto out;
240 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
241 goto out;
242 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
243 goto out;
244 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
245 goto out;
246 if ((err = verify_sec_ctx_len(attrs)))
247 goto out;
248 if ((err = verify_replay(p, attrs)))
249 goto out;
250
251 err = -EINVAL;
252 switch (p->mode) {
253 case XFRM_MODE_TRANSPORT:
254 case XFRM_MODE_TUNNEL:
255 case XFRM_MODE_ROUTEOPTIMIZATION:
256 case XFRM_MODE_BEET:
257 break;
258
259 default:
260 goto out;
261 }
262
263 err = 0;
264
265 out:
266 return err;
267 }
268
269 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
270 struct xfrm_algo_desc *(*get_byname)(const char *, int),
271 struct nlattr *rta)
272 {
273 struct xfrm_algo *p, *ualg;
274 struct xfrm_algo_desc *algo;
275
276 if (!rta)
277 return 0;
278
279 ualg = nla_data(rta);
280
281 algo = get_byname(ualg->alg_name, 1);
282 if (!algo)
283 return -ENOSYS;
284 *props = algo->desc.sadb_alg_id;
285
286 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
287 if (!p)
288 return -ENOMEM;
289
290 strcpy(p->alg_name, algo->name);
291 *algpp = p;
292 return 0;
293 }
294
295 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
296 struct nlattr *rta)
297 {
298 struct xfrm_algo *ualg;
299 struct xfrm_algo_auth *p;
300 struct xfrm_algo_desc *algo;
301
302 if (!rta)
303 return 0;
304
305 ualg = nla_data(rta);
306
307 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
308 if (!algo)
309 return -ENOSYS;
310 *props = algo->desc.sadb_alg_id;
311
312 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
313 if (!p)
314 return -ENOMEM;
315
316 strcpy(p->alg_name, algo->name);
317 p->alg_key_len = ualg->alg_key_len;
318 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
319 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
320
321 *algpp = p;
322 return 0;
323 }
324
325 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
326 struct nlattr *rta)
327 {
328 struct xfrm_algo_auth *p, *ualg;
329 struct xfrm_algo_desc *algo;
330
331 if (!rta)
332 return 0;
333
334 ualg = nla_data(rta);
335
336 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
337 if (!algo)
338 return -ENOSYS;
339 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
340 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
341 return -EINVAL;
342 *props = algo->desc.sadb_alg_id;
343
344 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
345 if (!p)
346 return -ENOMEM;
347
348 strcpy(p->alg_name, algo->name);
349 if (!p->alg_trunc_len)
350 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
351
352 *algpp = p;
353 return 0;
354 }
355
356 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
357 struct nlattr *rta)
358 {
359 struct xfrm_algo_aead *p, *ualg;
360 struct xfrm_algo_desc *algo;
361
362 if (!rta)
363 return 0;
364
365 ualg = nla_data(rta);
366
367 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
368 if (!algo)
369 return -ENOSYS;
370 *props = algo->desc.sadb_alg_id;
371
372 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
373 if (!p)
374 return -ENOMEM;
375
376 strcpy(p->alg_name, algo->name);
377 *algpp = p;
378 return 0;
379 }
380
381 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
382 struct nlattr *rp)
383 {
384 struct xfrm_replay_state_esn *up;
385 int ulen;
386
387 if (!replay_esn || !rp)
388 return 0;
389
390 up = nla_data(rp);
391 ulen = xfrm_replay_state_esn_len(up);
392
393 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
394 return -EINVAL;
395
396 return 0;
397 }
398
399 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
400 struct xfrm_replay_state_esn **preplay_esn,
401 struct nlattr *rta)
402 {
403 struct xfrm_replay_state_esn *p, *pp, *up;
404 int klen, ulen;
405
406 if (!rta)
407 return 0;
408
409 up = nla_data(rta);
410 klen = xfrm_replay_state_esn_len(up);
411 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
412
413 p = kzalloc(klen, GFP_KERNEL);
414 if (!p)
415 return -ENOMEM;
416
417 pp = kzalloc(klen, GFP_KERNEL);
418 if (!pp) {
419 kfree(p);
420 return -ENOMEM;
421 }
422
423 memcpy(p, up, ulen);
424 memcpy(pp, up, ulen);
425
426 *replay_esn = p;
427 *preplay_esn = pp;
428
429 return 0;
430 }
431
432 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
433 {
434 int len = 0;
435
436 if (xfrm_ctx) {
437 len += sizeof(struct xfrm_user_sec_ctx);
438 len += xfrm_ctx->ctx_len;
439 }
440 return len;
441 }
442
443 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
444 {
445 memcpy(&x->id, &p->id, sizeof(x->id));
446 memcpy(&x->sel, &p->sel, sizeof(x->sel));
447 memcpy(&x->lft, &p->lft, sizeof(x->lft));
448 x->props.mode = p->mode;
449 x->props.replay_window = p->replay_window;
450 x->props.reqid = p->reqid;
451 x->props.family = p->family;
452 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
453 x->props.flags = p->flags;
454
455 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
456 x->sel.family = p->family;
457 }
458
459 /*
460 * someday when pfkey also has support, we could have the code
461 * somehow made shareable and move it to xfrm_state.c - JHS
462 *
463 */
464 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
465 int update_esn)
466 {
467 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
468 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
469 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
470 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
471 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
472
473 if (re) {
474 struct xfrm_replay_state_esn *replay_esn;
475 replay_esn = nla_data(re);
476 memcpy(x->replay_esn, replay_esn,
477 xfrm_replay_state_esn_len(replay_esn));
478 memcpy(x->preplay_esn, replay_esn,
479 xfrm_replay_state_esn_len(replay_esn));
480 }
481
482 if (rp) {
483 struct xfrm_replay_state *replay;
484 replay = nla_data(rp);
485 memcpy(&x->replay, replay, sizeof(*replay));
486 memcpy(&x->preplay, replay, sizeof(*replay));
487 }
488
489 if (lt) {
490 struct xfrm_lifetime_cur *ltime;
491 ltime = nla_data(lt);
492 x->curlft.bytes = ltime->bytes;
493 x->curlft.packets = ltime->packets;
494 x->curlft.add_time = ltime->add_time;
495 x->curlft.use_time = ltime->use_time;
496 }
497
498 if (et)
499 x->replay_maxage = nla_get_u32(et);
500
501 if (rt)
502 x->replay_maxdiff = nla_get_u32(rt);
503 }
504
505 static struct xfrm_state *xfrm_state_construct(struct net *net,
506 struct xfrm_usersa_info *p,
507 struct nlattr **attrs,
508 int *errp)
509 {
510 struct xfrm_state *x = xfrm_state_alloc(net);
511 int err = -ENOMEM;
512
513 if (!x)
514 goto error_no_put;
515
516 copy_from_user_state(x, p);
517
518 if ((err = attach_aead(&x->aead, &x->props.ealgo,
519 attrs[XFRMA_ALG_AEAD])))
520 goto error;
521 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
522 attrs[XFRMA_ALG_AUTH_TRUNC])))
523 goto error;
524 if (!x->props.aalgo) {
525 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
526 attrs[XFRMA_ALG_AUTH])))
527 goto error;
528 }
529 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
530 xfrm_ealg_get_byname,
531 attrs[XFRMA_ALG_CRYPT])))
532 goto error;
533 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
534 xfrm_calg_get_byname,
535 attrs[XFRMA_ALG_COMP])))
536 goto error;
537
538 if (attrs[XFRMA_ENCAP]) {
539 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
540 sizeof(*x->encap), GFP_KERNEL);
541 if (x->encap == NULL)
542 goto error;
543 }
544
545 if (attrs[XFRMA_TFCPAD])
546 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
547
548 if (attrs[XFRMA_COADDR]) {
549 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
550 sizeof(*x->coaddr), GFP_KERNEL);
551 if (x->coaddr == NULL)
552 goto error;
553 }
554
555 xfrm_mark_get(attrs, &x->mark);
556
557 err = __xfrm_init_state(x, false);
558 if (err)
559 goto error;
560
561 if (attrs[XFRMA_SEC_CTX] &&
562 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
563 goto error;
564
565 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
566 attrs[XFRMA_REPLAY_ESN_VAL])))
567 goto error;
568
569 x->km.seq = p->seq;
570 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
571 /* sysctl_xfrm_aevent_etime is in 100ms units */
572 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
573
574 if ((err = xfrm_init_replay(x)))
575 goto error;
576
577 /* override default values from above */
578 xfrm_update_ae_params(x, attrs, 0);
579
580 return x;
581
582 error:
583 x->km.state = XFRM_STATE_DEAD;
584 xfrm_state_put(x);
585 error_no_put:
586 *errp = err;
587 return NULL;
588 }
589
590 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
591 struct nlattr **attrs)
592 {
593 struct net *net = sock_net(skb->sk);
594 struct xfrm_usersa_info *p = nlmsg_data(nlh);
595 struct xfrm_state *x;
596 int err;
597 struct km_event c;
598 kuid_t loginuid = audit_get_loginuid(current);
599 u32 sessionid = audit_get_sessionid(current);
600 u32 sid;
601
602 err = verify_newsa_info(p, attrs);
603 if (err)
604 return err;
605
606 x = xfrm_state_construct(net, p, attrs, &err);
607 if (!x)
608 return err;
609
610 xfrm_state_hold(x);
611 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
612 err = xfrm_state_add(x);
613 else
614 err = xfrm_state_update(x);
615
616 security_task_getsecid(current, &sid);
617 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
618
619 if (err < 0) {
620 x->km.state = XFRM_STATE_DEAD;
621 __xfrm_state_put(x);
622 goto out;
623 }
624
625 c.seq = nlh->nlmsg_seq;
626 c.portid = nlh->nlmsg_pid;
627 c.event = nlh->nlmsg_type;
628
629 km_state_notify(x, &c);
630 out:
631 xfrm_state_put(x);
632 return err;
633 }
634
635 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
636 struct xfrm_usersa_id *p,
637 struct nlattr **attrs,
638 int *errp)
639 {
640 struct xfrm_state *x = NULL;
641 struct xfrm_mark m;
642 int err;
643 u32 mark = xfrm_mark_get(attrs, &m);
644
645 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
646 err = -ESRCH;
647 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
648 } else {
649 xfrm_address_t *saddr = NULL;
650
651 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
652 if (!saddr) {
653 err = -EINVAL;
654 goto out;
655 }
656
657 err = -ESRCH;
658 x = xfrm_state_lookup_byaddr(net, mark,
659 &p->daddr, saddr,
660 p->proto, p->family);
661 }
662
663 out:
664 if (!x && errp)
665 *errp = err;
666 return x;
667 }
668
669 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
670 struct nlattr **attrs)
671 {
672 struct net *net = sock_net(skb->sk);
673 struct xfrm_state *x;
674 int err = -ESRCH;
675 struct km_event c;
676 struct xfrm_usersa_id *p = nlmsg_data(nlh);
677 kuid_t loginuid = audit_get_loginuid(current);
678 u32 sessionid = audit_get_sessionid(current);
679 u32 sid;
680
681 x = xfrm_user_state_lookup(net, p, attrs, &err);
682 if (x == NULL)
683 return err;
684
685 if ((err = security_xfrm_state_delete(x)) != 0)
686 goto out;
687
688 if (xfrm_state_kern(x)) {
689 err = -EPERM;
690 goto out;
691 }
692
693 err = xfrm_state_delete(x);
694
695 if (err < 0)
696 goto out;
697
698 c.seq = nlh->nlmsg_seq;
699 c.portid = nlh->nlmsg_pid;
700 c.event = nlh->nlmsg_type;
701 km_state_notify(x, &c);
702
703 out:
704 security_task_getsecid(current, &sid);
705 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
706 xfrm_state_put(x);
707 return err;
708 }
709
710 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
711 {
712 memset(p, 0, sizeof(*p));
713 memcpy(&p->id, &x->id, sizeof(p->id));
714 memcpy(&p->sel, &x->sel, sizeof(p->sel));
715 memcpy(&p->lft, &x->lft, sizeof(p->lft));
716 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
717 memcpy(&p->stats, &x->stats, sizeof(p->stats));
718 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
719 p->mode = x->props.mode;
720 p->replay_window = x->props.replay_window;
721 p->reqid = x->props.reqid;
722 p->family = x->props.family;
723 p->flags = x->props.flags;
724 p->seq = x->km.seq;
725 }
726
727 struct xfrm_dump_info {
728 struct sk_buff *in_skb;
729 struct sk_buff *out_skb;
730 u32 nlmsg_seq;
731 u16 nlmsg_flags;
732 };
733
734 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
735 {
736 struct xfrm_user_sec_ctx *uctx;
737 struct nlattr *attr;
738 int ctx_size = sizeof(*uctx) + s->ctx_len;
739
740 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
741 if (attr == NULL)
742 return -EMSGSIZE;
743
744 uctx = nla_data(attr);
745 uctx->exttype = XFRMA_SEC_CTX;
746 uctx->len = ctx_size;
747 uctx->ctx_doi = s->ctx_doi;
748 uctx->ctx_alg = s->ctx_alg;
749 uctx->ctx_len = s->ctx_len;
750 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
751
752 return 0;
753 }
754
755 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
756 {
757 struct xfrm_algo *algo;
758 struct nlattr *nla;
759
760 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
761 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
762 if (!nla)
763 return -EMSGSIZE;
764
765 algo = nla_data(nla);
766 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
767 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
768 algo->alg_key_len = auth->alg_key_len;
769
770 return 0;
771 }
772
773 /* Don't change this without updating xfrm_sa_len! */
774 static int copy_to_user_state_extra(struct xfrm_state *x,
775 struct xfrm_usersa_info *p,
776 struct sk_buff *skb)
777 {
778 int ret = 0;
779
780 copy_to_user_state(x, p);
781
782 if (x->coaddr) {
783 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
784 if (ret)
785 goto out;
786 }
787 if (x->lastused) {
788 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
789 if (ret)
790 goto out;
791 }
792 if (x->aead) {
793 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
794 if (ret)
795 goto out;
796 }
797 if (x->aalg) {
798 ret = copy_to_user_auth(x->aalg, skb);
799 if (!ret)
800 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
801 xfrm_alg_auth_len(x->aalg), x->aalg);
802 if (ret)
803 goto out;
804 }
805 if (x->ealg) {
806 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
807 if (ret)
808 goto out;
809 }
810 if (x->calg) {
811 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
812 if (ret)
813 goto out;
814 }
815 if (x->encap) {
816 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
817 if (ret)
818 goto out;
819 }
820 if (x->tfcpad) {
821 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
822 if (ret)
823 goto out;
824 }
825 ret = xfrm_mark_put(skb, &x->mark);
826 if (ret)
827 goto out;
828 if (x->replay_esn) {
829 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
830 xfrm_replay_state_esn_len(x->replay_esn),
831 x->replay_esn);
832 if (ret)
833 goto out;
834 }
835 if (x->security)
836 ret = copy_sec_ctx(x->security, skb);
837 out:
838 return ret;
839 }
840
841 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
842 {
843 struct xfrm_dump_info *sp = ptr;
844 struct sk_buff *in_skb = sp->in_skb;
845 struct sk_buff *skb = sp->out_skb;
846 struct xfrm_usersa_info *p;
847 struct nlmsghdr *nlh;
848 int err;
849
850 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
851 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
852 if (nlh == NULL)
853 return -EMSGSIZE;
854
855 p = nlmsg_data(nlh);
856
857 err = copy_to_user_state_extra(x, p, skb);
858 if (err) {
859 nlmsg_cancel(skb, nlh);
860 return err;
861 }
862 nlmsg_end(skb, nlh);
863 return 0;
864 }
865
866 static int xfrm_dump_sa_done(struct netlink_callback *cb)
867 {
868 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
869 xfrm_state_walk_done(walk);
870 return 0;
871 }
872
873 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
874 {
875 struct net *net = sock_net(skb->sk);
876 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
877 struct xfrm_dump_info info;
878
879 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
880 sizeof(cb->args) - sizeof(cb->args[0]));
881
882 info.in_skb = cb->skb;
883 info.out_skb = skb;
884 info.nlmsg_seq = cb->nlh->nlmsg_seq;
885 info.nlmsg_flags = NLM_F_MULTI;
886
887 if (!cb->args[0]) {
888 cb->args[0] = 1;
889 xfrm_state_walk_init(walk, 0);
890 }
891
892 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
893
894 return skb->len;
895 }
896
897 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
898 struct xfrm_state *x, u32 seq)
899 {
900 struct xfrm_dump_info info;
901 struct sk_buff *skb;
902 int err;
903
904 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
905 if (!skb)
906 return ERR_PTR(-ENOMEM);
907
908 info.in_skb = in_skb;
909 info.out_skb = skb;
910 info.nlmsg_seq = seq;
911 info.nlmsg_flags = 0;
912
913 err = dump_one_state(x, 0, &info);
914 if (err) {
915 kfree_skb(skb);
916 return ERR_PTR(err);
917 }
918
919 return skb;
920 }
921
922 static inline size_t xfrm_spdinfo_msgsize(void)
923 {
924 return NLMSG_ALIGN(4)
925 + nla_total_size(sizeof(struct xfrmu_spdinfo))
926 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
927 }
928
929 static int build_spdinfo(struct sk_buff *skb, struct net *net,
930 u32 portid, u32 seq, u32 flags)
931 {
932 struct xfrmk_spdinfo si;
933 struct xfrmu_spdinfo spc;
934 struct xfrmu_spdhinfo sph;
935 struct nlmsghdr *nlh;
936 int err;
937 u32 *f;
938
939 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
940 if (nlh == NULL) /* shouldn't really happen ... */
941 return -EMSGSIZE;
942
943 f = nlmsg_data(nlh);
944 *f = flags;
945 xfrm_spd_getinfo(net, &si);
946 spc.incnt = si.incnt;
947 spc.outcnt = si.outcnt;
948 spc.fwdcnt = si.fwdcnt;
949 spc.inscnt = si.inscnt;
950 spc.outscnt = si.outscnt;
951 spc.fwdscnt = si.fwdscnt;
952 sph.spdhcnt = si.spdhcnt;
953 sph.spdhmcnt = si.spdhmcnt;
954
955 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
956 if (!err)
957 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
958 if (err) {
959 nlmsg_cancel(skb, nlh);
960 return err;
961 }
962
963 return nlmsg_end(skb, nlh);
964 }
965
966 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
967 struct nlattr **attrs)
968 {
969 struct net *net = sock_net(skb->sk);
970 struct sk_buff *r_skb;
971 u32 *flags = nlmsg_data(nlh);
972 u32 sportid = NETLINK_CB(skb).portid;
973 u32 seq = nlh->nlmsg_seq;
974
975 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
976 if (r_skb == NULL)
977 return -ENOMEM;
978
979 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
980 BUG();
981
982 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
983 }
984
985 static inline size_t xfrm_sadinfo_msgsize(void)
986 {
987 return NLMSG_ALIGN(4)
988 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
989 + nla_total_size(4); /* XFRMA_SAD_CNT */
990 }
991
992 static int build_sadinfo(struct sk_buff *skb, struct net *net,
993 u32 portid, u32 seq, u32 flags)
994 {
995 struct xfrmk_sadinfo si;
996 struct xfrmu_sadhinfo sh;
997 struct nlmsghdr *nlh;
998 int err;
999 u32 *f;
1000
1001 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1002 if (nlh == NULL) /* shouldn't really happen ... */
1003 return -EMSGSIZE;
1004
1005 f = nlmsg_data(nlh);
1006 *f = flags;
1007 xfrm_sad_getinfo(net, &si);
1008
1009 sh.sadhmcnt = si.sadhmcnt;
1010 sh.sadhcnt = si.sadhcnt;
1011
1012 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1013 if (!err)
1014 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1015 if (err) {
1016 nlmsg_cancel(skb, nlh);
1017 return err;
1018 }
1019
1020 return nlmsg_end(skb, nlh);
1021 }
1022
1023 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1024 struct nlattr **attrs)
1025 {
1026 struct net *net = sock_net(skb->sk);
1027 struct sk_buff *r_skb;
1028 u32 *flags = nlmsg_data(nlh);
1029 u32 sportid = NETLINK_CB(skb).portid;
1030 u32 seq = nlh->nlmsg_seq;
1031
1032 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1033 if (r_skb == NULL)
1034 return -ENOMEM;
1035
1036 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1037 BUG();
1038
1039 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1040 }
1041
1042 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1043 struct nlattr **attrs)
1044 {
1045 struct net *net = sock_net(skb->sk);
1046 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1047 struct xfrm_state *x;
1048 struct sk_buff *resp_skb;
1049 int err = -ESRCH;
1050
1051 x = xfrm_user_state_lookup(net, p, attrs, &err);
1052 if (x == NULL)
1053 goto out_noput;
1054
1055 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1056 if (IS_ERR(resp_skb)) {
1057 err = PTR_ERR(resp_skb);
1058 } else {
1059 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1060 }
1061 xfrm_state_put(x);
1062 out_noput:
1063 return err;
1064 }
1065
1066 static int verify_userspi_info(struct xfrm_userspi_info *p)
1067 {
1068 switch (p->info.id.proto) {
1069 case IPPROTO_AH:
1070 case IPPROTO_ESP:
1071 break;
1072
1073 case IPPROTO_COMP:
1074 /* IPCOMP spi is 16-bits. */
1075 if (p->max >= 0x10000)
1076 return -EINVAL;
1077 break;
1078
1079 default:
1080 return -EINVAL;
1081 }
1082
1083 if (p->min > p->max)
1084 return -EINVAL;
1085
1086 return 0;
1087 }
1088
1089 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1090 struct nlattr **attrs)
1091 {
1092 struct net *net = sock_net(skb->sk);
1093 struct xfrm_state *x;
1094 struct xfrm_userspi_info *p;
1095 struct sk_buff *resp_skb;
1096 xfrm_address_t *daddr;
1097 int family;
1098 int err;
1099 u32 mark;
1100 struct xfrm_mark m;
1101
1102 p = nlmsg_data(nlh);
1103 err = verify_userspi_info(p);
1104 if (err)
1105 goto out_noput;
1106
1107 family = p->info.family;
1108 daddr = &p->info.id.daddr;
1109
1110 x = NULL;
1111
1112 mark = xfrm_mark_get(attrs, &m);
1113 if (p->info.seq) {
1114 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1115 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1116 xfrm_state_put(x);
1117 x = NULL;
1118 }
1119 }
1120
1121 if (!x)
1122 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1123 p->info.id.proto, daddr,
1124 &p->info.saddr, 1,
1125 family);
1126 err = -ENOENT;
1127 if (x == NULL)
1128 goto out_noput;
1129
1130 err = xfrm_alloc_spi(x, p->min, p->max);
1131 if (err)
1132 goto out;
1133
1134 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1135 if (IS_ERR(resp_skb)) {
1136 err = PTR_ERR(resp_skb);
1137 goto out;
1138 }
1139
1140 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1141
1142 out:
1143 xfrm_state_put(x);
1144 out_noput:
1145 return err;
1146 }
1147
1148 static int verify_policy_dir(u8 dir)
1149 {
1150 switch (dir) {
1151 case XFRM_POLICY_IN:
1152 case XFRM_POLICY_OUT:
1153 case XFRM_POLICY_FWD:
1154 break;
1155
1156 default:
1157 return -EINVAL;
1158 }
1159
1160 return 0;
1161 }
1162
1163 static int verify_policy_type(u8 type)
1164 {
1165 switch (type) {
1166 case XFRM_POLICY_TYPE_MAIN:
1167 #ifdef CONFIG_XFRM_SUB_POLICY
1168 case XFRM_POLICY_TYPE_SUB:
1169 #endif
1170 break;
1171
1172 default:
1173 return -EINVAL;
1174 }
1175
1176 return 0;
1177 }
1178
1179 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1180 {
1181 switch (p->share) {
1182 case XFRM_SHARE_ANY:
1183 case XFRM_SHARE_SESSION:
1184 case XFRM_SHARE_USER:
1185 case XFRM_SHARE_UNIQUE:
1186 break;
1187
1188 default:
1189 return -EINVAL;
1190 }
1191
1192 switch (p->action) {
1193 case XFRM_POLICY_ALLOW:
1194 case XFRM_POLICY_BLOCK:
1195 break;
1196
1197 default:
1198 return -EINVAL;
1199 }
1200
1201 switch (p->sel.family) {
1202 case AF_INET:
1203 break;
1204
1205 case AF_INET6:
1206 #if IS_ENABLED(CONFIG_IPV6)
1207 break;
1208 #else
1209 return -EAFNOSUPPORT;
1210 #endif
1211
1212 default:
1213 return -EINVAL;
1214 }
1215
1216 return verify_policy_dir(p->dir);
1217 }
1218
1219 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1220 {
1221 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1222 struct xfrm_user_sec_ctx *uctx;
1223
1224 if (!rt)
1225 return 0;
1226
1227 uctx = nla_data(rt);
1228 return security_xfrm_policy_alloc(&pol->security, uctx);
1229 }
1230
1231 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1232 int nr)
1233 {
1234 int i;
1235
1236 xp->xfrm_nr = nr;
1237 for (i = 0; i < nr; i++, ut++) {
1238 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1239
1240 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1241 memcpy(&t->saddr, &ut->saddr,
1242 sizeof(xfrm_address_t));
1243 t->reqid = ut->reqid;
1244 t->mode = ut->mode;
1245 t->share = ut->share;
1246 t->optional = ut->optional;
1247 t->aalgos = ut->aalgos;
1248 t->ealgos = ut->ealgos;
1249 t->calgos = ut->calgos;
1250 /* If all masks are ~0, then we allow all algorithms. */
1251 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1252 t->encap_family = ut->family;
1253 }
1254 }
1255
1256 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1257 {
1258 int i;
1259
1260 if (nr > XFRM_MAX_DEPTH)
1261 return -EINVAL;
1262
1263 for (i = 0; i < nr; i++) {
1264 /* We never validated the ut->family value, so many
1265 * applications simply leave it at zero. The check was
1266 * never made and ut->family was ignored because all
1267 * templates could be assumed to have the same family as
1268 * the policy itself. Now that we will have ipv4-in-ipv6
1269 * and ipv6-in-ipv4 tunnels, this is no longer true.
1270 */
1271 if (!ut[i].family)
1272 ut[i].family = family;
1273
1274 switch (ut[i].family) {
1275 case AF_INET:
1276 break;
1277 #if IS_ENABLED(CONFIG_IPV6)
1278 case AF_INET6:
1279 break;
1280 #endif
1281 default:
1282 return -EINVAL;
1283 }
1284 }
1285
1286 return 0;
1287 }
1288
1289 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1290 {
1291 struct nlattr *rt = attrs[XFRMA_TMPL];
1292
1293 if (!rt) {
1294 pol->xfrm_nr = 0;
1295 } else {
1296 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1297 int nr = nla_len(rt) / sizeof(*utmpl);
1298 int err;
1299
1300 err = validate_tmpl(nr, utmpl, pol->family);
1301 if (err)
1302 return err;
1303
1304 copy_templates(pol, utmpl, nr);
1305 }
1306 return 0;
1307 }
1308
1309 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1310 {
1311 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1312 struct xfrm_userpolicy_type *upt;
1313 u8 type = XFRM_POLICY_TYPE_MAIN;
1314 int err;
1315
1316 if (rt) {
1317 upt = nla_data(rt);
1318 type = upt->type;
1319 }
1320
1321 err = verify_policy_type(type);
1322 if (err)
1323 return err;
1324
1325 *tp = type;
1326 return 0;
1327 }
1328
1329 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1330 {
1331 xp->priority = p->priority;
1332 xp->index = p->index;
1333 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1334 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1335 xp->action = p->action;
1336 xp->flags = p->flags;
1337 xp->family = p->sel.family;
1338 /* XXX xp->share = p->share; */
1339 }
1340
1341 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1342 {
1343 memset(p, 0, sizeof(*p));
1344 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1345 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1346 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1347 p->priority = xp->priority;
1348 p->index = xp->index;
1349 p->sel.family = xp->family;
1350 p->dir = dir;
1351 p->action = xp->action;
1352 p->flags = xp->flags;
1353 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1354 }
1355
1356 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1357 {
1358 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1359 int err;
1360
1361 if (!xp) {
1362 *errp = -ENOMEM;
1363 return NULL;
1364 }
1365
1366 copy_from_user_policy(xp, p);
1367
1368 err = copy_from_user_policy_type(&xp->type, attrs);
1369 if (err)
1370 goto error;
1371
1372 if (!(err = copy_from_user_tmpl(xp, attrs)))
1373 err = copy_from_user_sec_ctx(xp, attrs);
1374 if (err)
1375 goto error;
1376
1377 xfrm_mark_get(attrs, &xp->mark);
1378
1379 return xp;
1380 error:
1381 *errp = err;
1382 xp->walk.dead = 1;
1383 xfrm_policy_destroy(xp);
1384 return NULL;
1385 }
1386
1387 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1388 struct nlattr **attrs)
1389 {
1390 struct net *net = sock_net(skb->sk);
1391 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1392 struct xfrm_policy *xp;
1393 struct km_event c;
1394 int err;
1395 int excl;
1396 kuid_t loginuid = audit_get_loginuid(current);
1397 u32 sessionid = audit_get_sessionid(current);
1398 u32 sid;
1399
1400 err = verify_newpolicy_info(p);
1401 if (err)
1402 return err;
1403 err = verify_sec_ctx_len(attrs);
1404 if (err)
1405 return err;
1406
1407 xp = xfrm_policy_construct(net, p, attrs, &err);
1408 if (!xp)
1409 return err;
1410
1411 /* shouldn't excl be based on nlh flags??
1412 * Aha! this is anti-netlink really i.e more pfkey derived
1413 * in netlink excl is a flag and you wouldnt need
1414 * a type XFRM_MSG_UPDPOLICY - JHS */
1415 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1416 err = xfrm_policy_insert(p->dir, xp, excl);
1417 security_task_getsecid(current, &sid);
1418 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1419
1420 if (err) {
1421 security_xfrm_policy_free(xp->security);
1422 kfree(xp);
1423 return err;
1424 }
1425
1426 c.event = nlh->nlmsg_type;
1427 c.seq = nlh->nlmsg_seq;
1428 c.portid = nlh->nlmsg_pid;
1429 km_policy_notify(xp, p->dir, &c);
1430
1431 xfrm_pol_put(xp);
1432
1433 return 0;
1434 }
1435
1436 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1437 {
1438 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1439 int i;
1440
1441 if (xp->xfrm_nr == 0)
1442 return 0;
1443
1444 for (i = 0; i < xp->xfrm_nr; i++) {
1445 struct xfrm_user_tmpl *up = &vec[i];
1446 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1447
1448 memset(up, 0, sizeof(*up));
1449 memcpy(&up->id, &kp->id, sizeof(up->id));
1450 up->family = kp->encap_family;
1451 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1452 up->reqid = kp->reqid;
1453 up->mode = kp->mode;
1454 up->share = kp->share;
1455 up->optional = kp->optional;
1456 up->aalgos = kp->aalgos;
1457 up->ealgos = kp->ealgos;
1458 up->calgos = kp->calgos;
1459 }
1460
1461 return nla_put(skb, XFRMA_TMPL,
1462 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1463 }
1464
1465 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1466 {
1467 if (x->security) {
1468 return copy_sec_ctx(x->security, skb);
1469 }
1470 return 0;
1471 }
1472
1473 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1474 {
1475 if (xp->security)
1476 return copy_sec_ctx(xp->security, skb);
1477 return 0;
1478 }
1479 static inline size_t userpolicy_type_attrsize(void)
1480 {
1481 #ifdef CONFIG_XFRM_SUB_POLICY
1482 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1483 #else
1484 return 0;
1485 #endif
1486 }
1487
1488 #ifdef CONFIG_XFRM_SUB_POLICY
1489 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1490 {
1491 struct xfrm_userpolicy_type upt = {
1492 .type = type,
1493 };
1494
1495 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1496 }
1497
1498 #else
1499 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1500 {
1501 return 0;
1502 }
1503 #endif
1504
1505 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1506 {
1507 struct xfrm_dump_info *sp = ptr;
1508 struct xfrm_userpolicy_info *p;
1509 struct sk_buff *in_skb = sp->in_skb;
1510 struct sk_buff *skb = sp->out_skb;
1511 struct nlmsghdr *nlh;
1512 int err;
1513
1514 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1515 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1516 if (nlh == NULL)
1517 return -EMSGSIZE;
1518
1519 p = nlmsg_data(nlh);
1520 copy_to_user_policy(xp, p, dir);
1521 err = copy_to_user_tmpl(xp, skb);
1522 if (!err)
1523 err = copy_to_user_sec_ctx(xp, skb);
1524 if (!err)
1525 err = copy_to_user_policy_type(xp->type, skb);
1526 if (!err)
1527 err = xfrm_mark_put(skb, &xp->mark);
1528 if (err) {
1529 nlmsg_cancel(skb, nlh);
1530 return err;
1531 }
1532 nlmsg_end(skb, nlh);
1533 return 0;
1534 }
1535
1536 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1537 {
1538 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1539
1540 xfrm_policy_walk_done(walk);
1541 return 0;
1542 }
1543
1544 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1545 {
1546 struct net *net = sock_net(skb->sk);
1547 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1548 struct xfrm_dump_info info;
1549
1550 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1551 sizeof(cb->args) - sizeof(cb->args[0]));
1552
1553 info.in_skb = cb->skb;
1554 info.out_skb = skb;
1555 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1556 info.nlmsg_flags = NLM_F_MULTI;
1557
1558 if (!cb->args[0]) {
1559 cb->args[0] = 1;
1560 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1561 }
1562
1563 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1564
1565 return skb->len;
1566 }
1567
1568 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1569 struct xfrm_policy *xp,
1570 int dir, u32 seq)
1571 {
1572 struct xfrm_dump_info info;
1573 struct sk_buff *skb;
1574 int err;
1575
1576 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1577 if (!skb)
1578 return ERR_PTR(-ENOMEM);
1579
1580 info.in_skb = in_skb;
1581 info.out_skb = skb;
1582 info.nlmsg_seq = seq;
1583 info.nlmsg_flags = 0;
1584
1585 err = dump_one_policy(xp, dir, 0, &info);
1586 if (err) {
1587 kfree_skb(skb);
1588 return ERR_PTR(err);
1589 }
1590
1591 return skb;
1592 }
1593
1594 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1595 struct nlattr **attrs)
1596 {
1597 struct net *net = sock_net(skb->sk);
1598 struct xfrm_policy *xp;
1599 struct xfrm_userpolicy_id *p;
1600 u8 type = XFRM_POLICY_TYPE_MAIN;
1601 int err;
1602 struct km_event c;
1603 int delete;
1604 struct xfrm_mark m;
1605 u32 mark = xfrm_mark_get(attrs, &m);
1606
1607 p = nlmsg_data(nlh);
1608 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1609
1610 err = copy_from_user_policy_type(&type, attrs);
1611 if (err)
1612 return err;
1613
1614 err = verify_policy_dir(p->dir);
1615 if (err)
1616 return err;
1617
1618 if (p->index)
1619 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1620 else {
1621 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1622 struct xfrm_sec_ctx *ctx;
1623
1624 err = verify_sec_ctx_len(attrs);
1625 if (err)
1626 return err;
1627
1628 ctx = NULL;
1629 if (rt) {
1630 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1631
1632 err = security_xfrm_policy_alloc(&ctx, uctx);
1633 if (err)
1634 return err;
1635 }
1636 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1637 ctx, delete, &err);
1638 security_xfrm_policy_free(ctx);
1639 }
1640 if (xp == NULL)
1641 return -ENOENT;
1642
1643 if (!delete) {
1644 struct sk_buff *resp_skb;
1645
1646 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1647 if (IS_ERR(resp_skb)) {
1648 err = PTR_ERR(resp_skb);
1649 } else {
1650 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1651 NETLINK_CB(skb).portid);
1652 }
1653 } else {
1654 kuid_t loginuid = audit_get_loginuid(current);
1655 u32 sessionid = audit_get_sessionid(current);
1656 u32 sid;
1657
1658 security_task_getsecid(current, &sid);
1659 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1660 sid);
1661
1662 if (err != 0)
1663 goto out;
1664
1665 c.data.byid = p->index;
1666 c.event = nlh->nlmsg_type;
1667 c.seq = nlh->nlmsg_seq;
1668 c.portid = nlh->nlmsg_pid;
1669 km_policy_notify(xp, p->dir, &c);
1670 }
1671
1672 out:
1673 xfrm_pol_put(xp);
1674 return err;
1675 }
1676
1677 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1678 struct nlattr **attrs)
1679 {
1680 struct net *net = sock_net(skb->sk);
1681 struct km_event c;
1682 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1683 struct xfrm_audit audit_info;
1684 int err;
1685
1686 audit_info.loginuid = audit_get_loginuid(current);
1687 audit_info.sessionid = audit_get_sessionid(current);
1688 security_task_getsecid(current, &audit_info.secid);
1689 err = xfrm_state_flush(net, p->proto, &audit_info);
1690 if (err) {
1691 if (err == -ESRCH) /* empty table */
1692 return 0;
1693 return err;
1694 }
1695 c.data.proto = p->proto;
1696 c.event = nlh->nlmsg_type;
1697 c.seq = nlh->nlmsg_seq;
1698 c.portid = nlh->nlmsg_pid;
1699 c.net = net;
1700 km_state_notify(NULL, &c);
1701
1702 return 0;
1703 }
1704
1705 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1706 {
1707 size_t replay_size = x->replay_esn ?
1708 xfrm_replay_state_esn_len(x->replay_esn) :
1709 sizeof(struct xfrm_replay_state);
1710
1711 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1712 + nla_total_size(replay_size)
1713 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1714 + nla_total_size(sizeof(struct xfrm_mark))
1715 + nla_total_size(4) /* XFRM_AE_RTHR */
1716 + nla_total_size(4); /* XFRM_AE_ETHR */
1717 }
1718
1719 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1720 {
1721 struct xfrm_aevent_id *id;
1722 struct nlmsghdr *nlh;
1723 int err;
1724
1725 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1726 if (nlh == NULL)
1727 return -EMSGSIZE;
1728
1729 id = nlmsg_data(nlh);
1730 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1731 id->sa_id.spi = x->id.spi;
1732 id->sa_id.family = x->props.family;
1733 id->sa_id.proto = x->id.proto;
1734 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1735 id->reqid = x->props.reqid;
1736 id->flags = c->data.aevent;
1737
1738 if (x->replay_esn) {
1739 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1740 xfrm_replay_state_esn_len(x->replay_esn),
1741 x->replay_esn);
1742 } else {
1743 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1744 &x->replay);
1745 }
1746 if (err)
1747 goto out_cancel;
1748 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1749 if (err)
1750 goto out_cancel;
1751
1752 if (id->flags & XFRM_AE_RTHR) {
1753 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1754 if (err)
1755 goto out_cancel;
1756 }
1757 if (id->flags & XFRM_AE_ETHR) {
1758 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1759 x->replay_maxage * 10 / HZ);
1760 if (err)
1761 goto out_cancel;
1762 }
1763 err = xfrm_mark_put(skb, &x->mark);
1764 if (err)
1765 goto out_cancel;
1766
1767 return nlmsg_end(skb, nlh);
1768
1769 out_cancel:
1770 nlmsg_cancel(skb, nlh);
1771 return err;
1772 }
1773
1774 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1775 struct nlattr **attrs)
1776 {
1777 struct net *net = sock_net(skb->sk);
1778 struct xfrm_state *x;
1779 struct sk_buff *r_skb;
1780 int err;
1781 struct km_event c;
1782 u32 mark;
1783 struct xfrm_mark m;
1784 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1785 struct xfrm_usersa_id *id = &p->sa_id;
1786
1787 mark = xfrm_mark_get(attrs, &m);
1788
1789 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1790 if (x == NULL)
1791 return -ESRCH;
1792
1793 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1794 if (r_skb == NULL) {
1795 xfrm_state_put(x);
1796 return -ENOMEM;
1797 }
1798
1799 /*
1800 * XXX: is this lock really needed - none of the other
1801 * gets lock (the concern is things getting updated
1802 * while we are still reading) - jhs
1803 */
1804 spin_lock_bh(&x->lock);
1805 c.data.aevent = p->flags;
1806 c.seq = nlh->nlmsg_seq;
1807 c.portid = nlh->nlmsg_pid;
1808
1809 if (build_aevent(r_skb, x, &c) < 0)
1810 BUG();
1811 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1812 spin_unlock_bh(&x->lock);
1813 xfrm_state_put(x);
1814 return err;
1815 }
1816
1817 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1818 struct nlattr **attrs)
1819 {
1820 struct net *net = sock_net(skb->sk);
1821 struct xfrm_state *x;
1822 struct km_event c;
1823 int err = - EINVAL;
1824 u32 mark = 0;
1825 struct xfrm_mark m;
1826 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1827 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1828 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1829 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1830
1831 if (!lt && !rp && !re)
1832 return err;
1833
1834 /* pedantic mode - thou shalt sayeth replaceth */
1835 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1836 return err;
1837
1838 mark = xfrm_mark_get(attrs, &m);
1839
1840 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1841 if (x == NULL)
1842 return -ESRCH;
1843
1844 if (x->km.state != XFRM_STATE_VALID)
1845 goto out;
1846
1847 err = xfrm_replay_verify_len(x->replay_esn, rp);
1848 if (err)
1849 goto out;
1850
1851 spin_lock_bh(&x->lock);
1852 xfrm_update_ae_params(x, attrs, 1);
1853 spin_unlock_bh(&x->lock);
1854
1855 c.event = nlh->nlmsg_type;
1856 c.seq = nlh->nlmsg_seq;
1857 c.portid = nlh->nlmsg_pid;
1858 c.data.aevent = XFRM_AE_CU;
1859 km_state_notify(x, &c);
1860 err = 0;
1861 out:
1862 xfrm_state_put(x);
1863 return err;
1864 }
1865
1866 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1867 struct nlattr **attrs)
1868 {
1869 struct net *net = sock_net(skb->sk);
1870 struct km_event c;
1871 u8 type = XFRM_POLICY_TYPE_MAIN;
1872 int err;
1873 struct xfrm_audit audit_info;
1874
1875 err = copy_from_user_policy_type(&type, attrs);
1876 if (err)
1877 return err;
1878
1879 audit_info.loginuid = audit_get_loginuid(current);
1880 audit_info.sessionid = audit_get_sessionid(current);
1881 security_task_getsecid(current, &audit_info.secid);
1882 err = xfrm_policy_flush(net, type, &audit_info);
1883 if (err) {
1884 if (err == -ESRCH) /* empty table */
1885 return 0;
1886 return err;
1887 }
1888
1889 c.data.type = type;
1890 c.event = nlh->nlmsg_type;
1891 c.seq = nlh->nlmsg_seq;
1892 c.portid = nlh->nlmsg_pid;
1893 c.net = net;
1894 km_policy_notify(NULL, 0, &c);
1895 return 0;
1896 }
1897
1898 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1899 struct nlattr **attrs)
1900 {
1901 struct net *net = sock_net(skb->sk);
1902 struct xfrm_policy *xp;
1903 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1904 struct xfrm_userpolicy_info *p = &up->pol;
1905 u8 type = XFRM_POLICY_TYPE_MAIN;
1906 int err = -ENOENT;
1907 struct xfrm_mark m;
1908 u32 mark = xfrm_mark_get(attrs, &m);
1909
1910 err = copy_from_user_policy_type(&type, attrs);
1911 if (err)
1912 return err;
1913
1914 err = verify_policy_dir(p->dir);
1915 if (err)
1916 return err;
1917
1918 if (p->index)
1919 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1920 else {
1921 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1922 struct xfrm_sec_ctx *ctx;
1923
1924 err = verify_sec_ctx_len(attrs);
1925 if (err)
1926 return err;
1927
1928 ctx = NULL;
1929 if (rt) {
1930 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1931
1932 err = security_xfrm_policy_alloc(&ctx, uctx);
1933 if (err)
1934 return err;
1935 }
1936 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1937 &p->sel, ctx, 0, &err);
1938 security_xfrm_policy_free(ctx);
1939 }
1940 if (xp == NULL)
1941 return -ENOENT;
1942
1943 if (unlikely(xp->walk.dead))
1944 goto out;
1945
1946 err = 0;
1947 if (up->hard) {
1948 kuid_t loginuid = audit_get_loginuid(current);
1949 u32 sessionid = audit_get_sessionid(current);
1950 u32 sid;
1951
1952 security_task_getsecid(current, &sid);
1953 xfrm_policy_delete(xp, p->dir);
1954 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1955
1956 } else {
1957 // reset the timers here?
1958 WARN(1, "Dont know what to do with soft policy expire\n");
1959 }
1960 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1961
1962 out:
1963 xfrm_pol_put(xp);
1964 return err;
1965 }
1966
1967 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1968 struct nlattr **attrs)
1969 {
1970 struct net *net = sock_net(skb->sk);
1971 struct xfrm_state *x;
1972 int err;
1973 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1974 struct xfrm_usersa_info *p = &ue->state;
1975 struct xfrm_mark m;
1976 u32 mark = xfrm_mark_get(attrs, &m);
1977
1978 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1979
1980 err = -ENOENT;
1981 if (x == NULL)
1982 return err;
1983
1984 spin_lock_bh(&x->lock);
1985 err = -EINVAL;
1986 if (x->km.state != XFRM_STATE_VALID)
1987 goto out;
1988 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
1989
1990 if (ue->hard) {
1991 kuid_t loginuid = audit_get_loginuid(current);
1992 u32 sessionid = audit_get_sessionid(current);
1993 u32 sid;
1994
1995 security_task_getsecid(current, &sid);
1996 __xfrm_state_delete(x);
1997 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1998 }
1999 err = 0;
2000 out:
2001 spin_unlock_bh(&x->lock);
2002 xfrm_state_put(x);
2003 return err;
2004 }
2005
2006 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2007 struct nlattr **attrs)
2008 {
2009 struct net *net = sock_net(skb->sk);
2010 struct xfrm_policy *xp;
2011 struct xfrm_user_tmpl *ut;
2012 int i;
2013 struct nlattr *rt = attrs[XFRMA_TMPL];
2014 struct xfrm_mark mark;
2015
2016 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2017 struct xfrm_state *x = xfrm_state_alloc(net);
2018 int err = -ENOMEM;
2019
2020 if (!x)
2021 goto nomem;
2022
2023 xfrm_mark_get(attrs, &mark);
2024
2025 err = verify_newpolicy_info(&ua->policy);
2026 if (err)
2027 goto bad_policy;
2028
2029 /* build an XP */
2030 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2031 if (!xp)
2032 goto free_state;
2033
2034 memcpy(&x->id, &ua->id, sizeof(ua->id));
2035 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2036 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2037 xp->mark.m = x->mark.m = mark.m;
2038 xp->mark.v = x->mark.v = mark.v;
2039 ut = nla_data(rt);
2040 /* extract the templates and for each call km_key */
2041 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2042 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2043 memcpy(&x->id, &t->id, sizeof(x->id));
2044 x->props.mode = t->mode;
2045 x->props.reqid = t->reqid;
2046 x->props.family = ut->family;
2047 t->aalgos = ua->aalgos;
2048 t->ealgos = ua->ealgos;
2049 t->calgos = ua->calgos;
2050 err = km_query(x, t, xp);
2051
2052 }
2053
2054 kfree(x);
2055 kfree(xp);
2056
2057 return 0;
2058
2059 bad_policy:
2060 WARN(1, "BAD policy passed\n");
2061 free_state:
2062 kfree(x);
2063 nomem:
2064 return err;
2065 }
2066
2067 #ifdef CONFIG_XFRM_MIGRATE
2068 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2069 struct xfrm_kmaddress *k,
2070 struct nlattr **attrs, int *num)
2071 {
2072 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2073 struct xfrm_user_migrate *um;
2074 int i, num_migrate;
2075
2076 if (k != NULL) {
2077 struct xfrm_user_kmaddress *uk;
2078
2079 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2080 memcpy(&k->local, &uk->local, sizeof(k->local));
2081 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2082 k->family = uk->family;
2083 k->reserved = uk->reserved;
2084 }
2085
2086 um = nla_data(rt);
2087 num_migrate = nla_len(rt) / sizeof(*um);
2088
2089 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2090 return -EINVAL;
2091
2092 for (i = 0; i < num_migrate; i++, um++, ma++) {
2093 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2094 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2095 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2096 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2097
2098 ma->proto = um->proto;
2099 ma->mode = um->mode;
2100 ma->reqid = um->reqid;
2101
2102 ma->old_family = um->old_family;
2103 ma->new_family = um->new_family;
2104 }
2105
2106 *num = i;
2107 return 0;
2108 }
2109
2110 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2111 struct nlattr **attrs)
2112 {
2113 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2114 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2115 struct xfrm_kmaddress km, *kmp;
2116 u8 type;
2117 int err;
2118 int n = 0;
2119
2120 if (attrs[XFRMA_MIGRATE] == NULL)
2121 return -EINVAL;
2122
2123 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2124
2125 err = copy_from_user_policy_type(&type, attrs);
2126 if (err)
2127 return err;
2128
2129 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2130 if (err)
2131 return err;
2132
2133 if (!n)
2134 return 0;
2135
2136 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2137
2138 return 0;
2139 }
2140 #else
2141 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2142 struct nlattr **attrs)
2143 {
2144 return -ENOPROTOOPT;
2145 }
2146 #endif
2147
2148 #ifdef CONFIG_XFRM_MIGRATE
2149 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2150 {
2151 struct xfrm_user_migrate um;
2152
2153 memset(&um, 0, sizeof(um));
2154 um.proto = m->proto;
2155 um.mode = m->mode;
2156 um.reqid = m->reqid;
2157 um.old_family = m->old_family;
2158 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2159 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2160 um.new_family = m->new_family;
2161 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2162 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2163
2164 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2165 }
2166
2167 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2168 {
2169 struct xfrm_user_kmaddress uk;
2170
2171 memset(&uk, 0, sizeof(uk));
2172 uk.family = k->family;
2173 uk.reserved = k->reserved;
2174 memcpy(&uk.local, &k->local, sizeof(uk.local));
2175 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2176
2177 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2178 }
2179
2180 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2181 {
2182 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2183 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2184 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2185 + userpolicy_type_attrsize();
2186 }
2187
2188 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2189 int num_migrate, const struct xfrm_kmaddress *k,
2190 const struct xfrm_selector *sel, u8 dir, u8 type)
2191 {
2192 const struct xfrm_migrate *mp;
2193 struct xfrm_userpolicy_id *pol_id;
2194 struct nlmsghdr *nlh;
2195 int i, err;
2196
2197 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2198 if (nlh == NULL)
2199 return -EMSGSIZE;
2200
2201 pol_id = nlmsg_data(nlh);
2202 /* copy data from selector, dir, and type to the pol_id */
2203 memset(pol_id, 0, sizeof(*pol_id));
2204 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2205 pol_id->dir = dir;
2206
2207 if (k != NULL) {
2208 err = copy_to_user_kmaddress(k, skb);
2209 if (err)
2210 goto out_cancel;
2211 }
2212 err = copy_to_user_policy_type(type, skb);
2213 if (err)
2214 goto out_cancel;
2215 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2216 err = copy_to_user_migrate(mp, skb);
2217 if (err)
2218 goto out_cancel;
2219 }
2220
2221 return nlmsg_end(skb, nlh);
2222
2223 out_cancel:
2224 nlmsg_cancel(skb, nlh);
2225 return err;
2226 }
2227
2228 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2229 const struct xfrm_migrate *m, int num_migrate,
2230 const struct xfrm_kmaddress *k)
2231 {
2232 struct net *net = &init_net;
2233 struct sk_buff *skb;
2234
2235 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2236 if (skb == NULL)
2237 return -ENOMEM;
2238
2239 /* build migrate */
2240 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2241 BUG();
2242
2243 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2244 }
2245 #else
2246 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2247 const struct xfrm_migrate *m, int num_migrate,
2248 const struct xfrm_kmaddress *k)
2249 {
2250 return -ENOPROTOOPT;
2251 }
2252 #endif
2253
2254 #define XMSGSIZE(type) sizeof(struct type)
2255
2256 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2257 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2258 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2259 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2260 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2261 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2262 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2263 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2264 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2265 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2266 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2267 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2268 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2269 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2270 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2271 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2272 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2273 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2274 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2275 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2276 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2277 };
2278
2279 #undef XMSGSIZE
2280
2281 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2282 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2283 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2284 [XFRMA_LASTUSED] = { .type = NLA_U64},
2285 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2286 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2287 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2288 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2289 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2290 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2291 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2292 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2293 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2294 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2295 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2296 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2297 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2298 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2299 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2300 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2301 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2302 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2303 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2304 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2305 };
2306
2307 static struct xfrm_link {
2308 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2309 int (*dump)(struct sk_buff *, struct netlink_callback *);
2310 int (*done)(struct netlink_callback *);
2311 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2312 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2313 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2314 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2315 .dump = xfrm_dump_sa,
2316 .done = xfrm_dump_sa_done },
2317 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2318 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2319 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2320 .dump = xfrm_dump_policy,
2321 .done = xfrm_dump_policy_done },
2322 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2323 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2324 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2325 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2326 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2327 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2328 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2329 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2330 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2331 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2332 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2333 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2334 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2335 };
2336
2337 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2338 {
2339 struct net *net = sock_net(skb->sk);
2340 struct nlattr *attrs[XFRMA_MAX+1];
2341 struct xfrm_link *link;
2342 int type, err;
2343
2344 type = nlh->nlmsg_type;
2345 if (type > XFRM_MSG_MAX)
2346 return -EINVAL;
2347
2348 type -= XFRM_MSG_BASE;
2349 link = &xfrm_dispatch[type];
2350
2351 /* All operations require privileges, even GET */
2352 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2353 return -EPERM;
2354
2355 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2356 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2357 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2358 if (link->dump == NULL)
2359 return -EINVAL;
2360
2361 {
2362 struct netlink_dump_control c = {
2363 .dump = link->dump,
2364 .done = link->done,
2365 };
2366 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2367 }
2368 }
2369
2370 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2371 xfrma_policy);
2372 if (err < 0)
2373 return err;
2374
2375 if (link->doit == NULL)
2376 return -EINVAL;
2377
2378 return link->doit(skb, nlh, attrs);
2379 }
2380
2381 static void xfrm_netlink_rcv(struct sk_buff *skb)
2382 {
2383 mutex_lock(&xfrm_cfg_mutex);
2384 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2385 mutex_unlock(&xfrm_cfg_mutex);
2386 }
2387
2388 static inline size_t xfrm_expire_msgsize(void)
2389 {
2390 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2391 + nla_total_size(sizeof(struct xfrm_mark));
2392 }
2393
2394 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2395 {
2396 struct xfrm_user_expire *ue;
2397 struct nlmsghdr *nlh;
2398 int err;
2399
2400 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2401 if (nlh == NULL)
2402 return -EMSGSIZE;
2403
2404 ue = nlmsg_data(nlh);
2405 copy_to_user_state(x, &ue->state);
2406 ue->hard = (c->data.hard != 0) ? 1 : 0;
2407
2408 err = xfrm_mark_put(skb, &x->mark);
2409 if (err)
2410 return err;
2411
2412 return nlmsg_end(skb, nlh);
2413 }
2414
2415 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2416 {
2417 struct net *net = xs_net(x);
2418 struct sk_buff *skb;
2419
2420 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2421 if (skb == NULL)
2422 return -ENOMEM;
2423
2424 if (build_expire(skb, x, c) < 0) {
2425 kfree_skb(skb);
2426 return -EMSGSIZE;
2427 }
2428
2429 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2430 }
2431
2432 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2433 {
2434 struct net *net = xs_net(x);
2435 struct sk_buff *skb;
2436
2437 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2438 if (skb == NULL)
2439 return -ENOMEM;
2440
2441 if (build_aevent(skb, x, c) < 0)
2442 BUG();
2443
2444 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2445 }
2446
2447 static int xfrm_notify_sa_flush(const struct km_event *c)
2448 {
2449 struct net *net = c->net;
2450 struct xfrm_usersa_flush *p;
2451 struct nlmsghdr *nlh;
2452 struct sk_buff *skb;
2453 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2454
2455 skb = nlmsg_new(len, GFP_ATOMIC);
2456 if (skb == NULL)
2457 return -ENOMEM;
2458
2459 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2460 if (nlh == NULL) {
2461 kfree_skb(skb);
2462 return -EMSGSIZE;
2463 }
2464
2465 p = nlmsg_data(nlh);
2466 p->proto = c->data.proto;
2467
2468 nlmsg_end(skb, nlh);
2469
2470 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2471 }
2472
2473 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2474 {
2475 size_t l = 0;
2476 if (x->aead)
2477 l += nla_total_size(aead_len(x->aead));
2478 if (x->aalg) {
2479 l += nla_total_size(sizeof(struct xfrm_algo) +
2480 (x->aalg->alg_key_len + 7) / 8);
2481 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2482 }
2483 if (x->ealg)
2484 l += nla_total_size(xfrm_alg_len(x->ealg));
2485 if (x->calg)
2486 l += nla_total_size(sizeof(*x->calg));
2487 if (x->encap)
2488 l += nla_total_size(sizeof(*x->encap));
2489 if (x->tfcpad)
2490 l += nla_total_size(sizeof(x->tfcpad));
2491 if (x->replay_esn)
2492 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2493 if (x->security)
2494 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2495 x->security->ctx_len);
2496 if (x->coaddr)
2497 l += nla_total_size(sizeof(*x->coaddr));
2498
2499 /* Must count x->lastused as it may become non-zero behind our back. */
2500 l += nla_total_size(sizeof(u64));
2501
2502 return l;
2503 }
2504
2505 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2506 {
2507 struct net *net = xs_net(x);
2508 struct xfrm_usersa_info *p;
2509 struct xfrm_usersa_id *id;
2510 struct nlmsghdr *nlh;
2511 struct sk_buff *skb;
2512 int len = xfrm_sa_len(x);
2513 int headlen, err;
2514
2515 headlen = sizeof(*p);
2516 if (c->event == XFRM_MSG_DELSA) {
2517 len += nla_total_size(headlen);
2518 headlen = sizeof(*id);
2519 len += nla_total_size(sizeof(struct xfrm_mark));
2520 }
2521 len += NLMSG_ALIGN(headlen);
2522
2523 skb = nlmsg_new(len, GFP_ATOMIC);
2524 if (skb == NULL)
2525 return -ENOMEM;
2526
2527 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2528 err = -EMSGSIZE;
2529 if (nlh == NULL)
2530 goto out_free_skb;
2531
2532 p = nlmsg_data(nlh);
2533 if (c->event == XFRM_MSG_DELSA) {
2534 struct nlattr *attr;
2535
2536 id = nlmsg_data(nlh);
2537 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2538 id->spi = x->id.spi;
2539 id->family = x->props.family;
2540 id->proto = x->id.proto;
2541
2542 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2543 err = -EMSGSIZE;
2544 if (attr == NULL)
2545 goto out_free_skb;
2546
2547 p = nla_data(attr);
2548 }
2549 err = copy_to_user_state_extra(x, p, skb);
2550 if (err)
2551 goto out_free_skb;
2552
2553 nlmsg_end(skb, nlh);
2554
2555 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2556
2557 out_free_skb:
2558 kfree_skb(skb);
2559 return err;
2560 }
2561
2562 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2563 {
2564
2565 switch (c->event) {
2566 case XFRM_MSG_EXPIRE:
2567 return xfrm_exp_state_notify(x, c);
2568 case XFRM_MSG_NEWAE:
2569 return xfrm_aevent_state_notify(x, c);
2570 case XFRM_MSG_DELSA:
2571 case XFRM_MSG_UPDSA:
2572 case XFRM_MSG_NEWSA:
2573 return xfrm_notify_sa(x, c);
2574 case XFRM_MSG_FLUSHSA:
2575 return xfrm_notify_sa_flush(c);
2576 default:
2577 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2578 c->event);
2579 break;
2580 }
2581
2582 return 0;
2583
2584 }
2585
2586 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2587 struct xfrm_policy *xp)
2588 {
2589 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2590 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2591 + nla_total_size(sizeof(struct xfrm_mark))
2592 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2593 + userpolicy_type_attrsize();
2594 }
2595
2596 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2597 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2598 {
2599 __u32 seq = xfrm_get_acqseq();
2600 struct xfrm_user_acquire *ua;
2601 struct nlmsghdr *nlh;
2602 int err;
2603
2604 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2605 if (nlh == NULL)
2606 return -EMSGSIZE;
2607
2608 ua = nlmsg_data(nlh);
2609 memcpy(&ua->id, &x->id, sizeof(ua->id));
2610 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2611 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2612 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2613 ua->aalgos = xt->aalgos;
2614 ua->ealgos = xt->ealgos;
2615 ua->calgos = xt->calgos;
2616 ua->seq = x->km.seq = seq;
2617
2618 err = copy_to_user_tmpl(xp, skb);
2619 if (!err)
2620 err = copy_to_user_state_sec_ctx(x, skb);
2621 if (!err)
2622 err = copy_to_user_policy_type(xp->type, skb);
2623 if (!err)
2624 err = xfrm_mark_put(skb, &xp->mark);
2625 if (err) {
2626 nlmsg_cancel(skb, nlh);
2627 return err;
2628 }
2629
2630 return nlmsg_end(skb, nlh);
2631 }
2632
2633 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2634 struct xfrm_policy *xp)
2635 {
2636 struct net *net = xs_net(x);
2637 struct sk_buff *skb;
2638
2639 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2640 if (skb == NULL)
2641 return -ENOMEM;
2642
2643 if (build_acquire(skb, x, xt, xp) < 0)
2644 BUG();
2645
2646 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2647 }
2648
2649 /* User gives us xfrm_user_policy_info followed by an array of 0
2650 * or more templates.
2651 */
2652 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2653 u8 *data, int len, int *dir)
2654 {
2655 struct net *net = sock_net(sk);
2656 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2657 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2658 struct xfrm_policy *xp;
2659 int nr;
2660
2661 switch (sk->sk_family) {
2662 case AF_INET:
2663 if (opt != IP_XFRM_POLICY) {
2664 *dir = -EOPNOTSUPP;
2665 return NULL;
2666 }
2667 break;
2668 #if IS_ENABLED(CONFIG_IPV6)
2669 case AF_INET6:
2670 if (opt != IPV6_XFRM_POLICY) {
2671 *dir = -EOPNOTSUPP;
2672 return NULL;
2673 }
2674 break;
2675 #endif
2676 default:
2677 *dir = -EINVAL;
2678 return NULL;
2679 }
2680
2681 *dir = -EINVAL;
2682
2683 if (len < sizeof(*p) ||
2684 verify_newpolicy_info(p))
2685 return NULL;
2686
2687 nr = ((len - sizeof(*p)) / sizeof(*ut));
2688 if (validate_tmpl(nr, ut, p->sel.family))
2689 return NULL;
2690
2691 if (p->dir > XFRM_POLICY_OUT)
2692 return NULL;
2693
2694 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2695 if (xp == NULL) {
2696 *dir = -ENOBUFS;
2697 return NULL;
2698 }
2699
2700 copy_from_user_policy(xp, p);
2701 xp->type = XFRM_POLICY_TYPE_MAIN;
2702 copy_templates(xp, ut, nr);
2703
2704 *dir = p->dir;
2705
2706 return xp;
2707 }
2708
2709 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2710 {
2711 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2712 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2713 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2714 + nla_total_size(sizeof(struct xfrm_mark))
2715 + userpolicy_type_attrsize();
2716 }
2717
2718 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2719 int dir, const struct km_event *c)
2720 {
2721 struct xfrm_user_polexpire *upe;
2722 int hard = c->data.hard;
2723 struct nlmsghdr *nlh;
2724 int err;
2725
2726 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2727 if (nlh == NULL)
2728 return -EMSGSIZE;
2729
2730 upe = nlmsg_data(nlh);
2731 copy_to_user_policy(xp, &upe->pol, dir);
2732 err = copy_to_user_tmpl(xp, skb);
2733 if (!err)
2734 err = copy_to_user_sec_ctx(xp, skb);
2735 if (!err)
2736 err = copy_to_user_policy_type(xp->type, skb);
2737 if (!err)
2738 err = xfrm_mark_put(skb, &xp->mark);
2739 if (err) {
2740 nlmsg_cancel(skb, nlh);
2741 return err;
2742 }
2743 upe->hard = !!hard;
2744
2745 return nlmsg_end(skb, nlh);
2746 }
2747
2748 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2749 {
2750 struct net *net = xp_net(xp);
2751 struct sk_buff *skb;
2752
2753 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2754 if (skb == NULL)
2755 return -ENOMEM;
2756
2757 if (build_polexpire(skb, xp, dir, c) < 0)
2758 BUG();
2759
2760 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2761 }
2762
2763 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2764 {
2765 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2766 struct net *net = xp_net(xp);
2767 struct xfrm_userpolicy_info *p;
2768 struct xfrm_userpolicy_id *id;
2769 struct nlmsghdr *nlh;
2770 struct sk_buff *skb;
2771 int headlen, err;
2772
2773 headlen = sizeof(*p);
2774 if (c->event == XFRM_MSG_DELPOLICY) {
2775 len += nla_total_size(headlen);
2776 headlen = sizeof(*id);
2777 }
2778 len += userpolicy_type_attrsize();
2779 len += nla_total_size(sizeof(struct xfrm_mark));
2780 len += NLMSG_ALIGN(headlen);
2781
2782 skb = nlmsg_new(len, GFP_ATOMIC);
2783 if (skb == NULL)
2784 return -ENOMEM;
2785
2786 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2787 err = -EMSGSIZE;
2788 if (nlh == NULL)
2789 goto out_free_skb;
2790
2791 p = nlmsg_data(nlh);
2792 if (c->event == XFRM_MSG_DELPOLICY) {
2793 struct nlattr *attr;
2794
2795 id = nlmsg_data(nlh);
2796 memset(id, 0, sizeof(*id));
2797 id->dir = dir;
2798 if (c->data.byid)
2799 id->index = xp->index;
2800 else
2801 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2802
2803 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2804 err = -EMSGSIZE;
2805 if (attr == NULL)
2806 goto out_free_skb;
2807
2808 p = nla_data(attr);
2809 }
2810
2811 copy_to_user_policy(xp, p, dir);
2812 err = copy_to_user_tmpl(xp, skb);
2813 if (!err)
2814 err = copy_to_user_policy_type(xp->type, skb);
2815 if (!err)
2816 err = xfrm_mark_put(skb, &xp->mark);
2817 if (err)
2818 goto out_free_skb;
2819
2820 nlmsg_end(skb, nlh);
2821
2822 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2823
2824 out_free_skb:
2825 kfree_skb(skb);
2826 return err;
2827 }
2828
2829 static int xfrm_notify_policy_flush(const struct km_event *c)
2830 {
2831 struct net *net = c->net;
2832 struct nlmsghdr *nlh;
2833 struct sk_buff *skb;
2834 int err;
2835
2836 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2837 if (skb == NULL)
2838 return -ENOMEM;
2839
2840 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2841 err = -EMSGSIZE;
2842 if (nlh == NULL)
2843 goto out_free_skb;
2844 err = copy_to_user_policy_type(c->data.type, skb);
2845 if (err)
2846 goto out_free_skb;
2847
2848 nlmsg_end(skb, nlh);
2849
2850 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2851
2852 out_free_skb:
2853 kfree_skb(skb);
2854 return err;
2855 }
2856
2857 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2858 {
2859
2860 switch (c->event) {
2861 case XFRM_MSG_NEWPOLICY:
2862 case XFRM_MSG_UPDPOLICY:
2863 case XFRM_MSG_DELPOLICY:
2864 return xfrm_notify_policy(xp, dir, c);
2865 case XFRM_MSG_FLUSHPOLICY:
2866 return xfrm_notify_policy_flush(c);
2867 case XFRM_MSG_POLEXPIRE:
2868 return xfrm_exp_policy_notify(xp, dir, c);
2869 default:
2870 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2871 c->event);
2872 }
2873
2874 return 0;
2875
2876 }
2877
2878 static inline size_t xfrm_report_msgsize(void)
2879 {
2880 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2881 }
2882
2883 static int build_report(struct sk_buff *skb, u8 proto,
2884 struct xfrm_selector *sel, xfrm_address_t *addr)
2885 {
2886 struct xfrm_user_report *ur;
2887 struct nlmsghdr *nlh;
2888
2889 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2890 if (nlh == NULL)
2891 return -EMSGSIZE;
2892
2893 ur = nlmsg_data(nlh);
2894 ur->proto = proto;
2895 memcpy(&ur->sel, sel, sizeof(ur->sel));
2896
2897 if (addr) {
2898 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2899 if (err) {
2900 nlmsg_cancel(skb, nlh);
2901 return err;
2902 }
2903 }
2904 return nlmsg_end(skb, nlh);
2905 }
2906
2907 static int xfrm_send_report(struct net *net, u8 proto,
2908 struct xfrm_selector *sel, xfrm_address_t *addr)
2909 {
2910 struct sk_buff *skb;
2911
2912 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2913 if (skb == NULL)
2914 return -ENOMEM;
2915
2916 if (build_report(skb, proto, sel, addr) < 0)
2917 BUG();
2918
2919 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2920 }
2921
2922 static inline size_t xfrm_mapping_msgsize(void)
2923 {
2924 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2925 }
2926
2927 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2928 xfrm_address_t *new_saddr, __be16 new_sport)
2929 {
2930 struct xfrm_user_mapping *um;
2931 struct nlmsghdr *nlh;
2932
2933 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2934 if (nlh == NULL)
2935 return -EMSGSIZE;
2936
2937 um = nlmsg_data(nlh);
2938
2939 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2940 um->id.spi = x->id.spi;
2941 um->id.family = x->props.family;
2942 um->id.proto = x->id.proto;
2943 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2944 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2945 um->new_sport = new_sport;
2946 um->old_sport = x->encap->encap_sport;
2947 um->reqid = x->props.reqid;
2948
2949 return nlmsg_end(skb, nlh);
2950 }
2951
2952 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2953 __be16 sport)
2954 {
2955 struct net *net = xs_net(x);
2956 struct sk_buff *skb;
2957
2958 if (x->id.proto != IPPROTO_ESP)
2959 return -EINVAL;
2960
2961 if (!x->encap)
2962 return -EINVAL;
2963
2964 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2965 if (skb == NULL)
2966 return -ENOMEM;
2967
2968 if (build_mapping(skb, x, ipaddr, sport) < 0)
2969 BUG();
2970
2971 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2972 }
2973
2974 static struct xfrm_mgr netlink_mgr = {
2975 .id = "netlink",
2976 .notify = xfrm_send_state_notify,
2977 .acquire = xfrm_send_acquire,
2978 .compile_policy = xfrm_compile_policy,
2979 .notify_policy = xfrm_send_policy_notify,
2980 .report = xfrm_send_report,
2981 .migrate = xfrm_send_migrate,
2982 .new_mapping = xfrm_send_mapping,
2983 };
2984
2985 static int __net_init xfrm_user_net_init(struct net *net)
2986 {
2987 struct sock *nlsk;
2988 struct netlink_kernel_cfg cfg = {
2989 .groups = XFRMNLGRP_MAX,
2990 .input = xfrm_netlink_rcv,
2991 };
2992
2993 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
2994 if (nlsk == NULL)
2995 return -ENOMEM;
2996 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2997 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2998 return 0;
2999 }
3000
3001 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3002 {
3003 struct net *net;
3004 list_for_each_entry(net, net_exit_list, exit_list)
3005 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3006 synchronize_net();
3007 list_for_each_entry(net, net_exit_list, exit_list)
3008 netlink_kernel_release(net->xfrm.nlsk_stash);
3009 }
3010
3011 static struct pernet_operations xfrm_user_net_ops = {
3012 .init = xfrm_user_net_init,
3013 .exit_batch = xfrm_user_net_exit,
3014 };
3015
3016 static int __init xfrm_user_init(void)
3017 {
3018 int rv;
3019
3020 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3021
3022 rv = register_pernet_subsys(&xfrm_user_net_ops);
3023 if (rv < 0)
3024 return rv;
3025 rv = xfrm_register_km(&netlink_mgr);
3026 if (rv < 0)
3027 unregister_pernet_subsys(&xfrm_user_net_ops);
3028 return rv;
3029 }
3030
3031 static void __exit xfrm_user_exit(void)
3032 {
3033 xfrm_unregister_km(&netlink_mgr);
3034 unregister_pernet_subsys(&xfrm_user_net_ops);
3035 }
3036
3037 module_init(xfrm_user_init);
3038 module_exit(xfrm_user_exit);
3039 MODULE_LICENSE("GPL");
3040 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3041
CJK support for tty framebuffer vt