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xfrm_user: return error pointer instead of NULL
[deliverable/linux.git] / net / xfrm / xfrm_user.c
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <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
127 if ((p->flags & XFRM_STATE_ESN) && !rt)
128 return -EINVAL;
129
130 if (!rt)
131 return 0;
132
133 if (p->id.proto != IPPROTO_ESP)
134 return -EINVAL;
135
136 if (p->replay_window != 0)
137 return -EINVAL;
138
139 return 0;
140 }
141
142 static int verify_newsa_info(struct xfrm_usersa_info *p,
143 struct nlattr **attrs)
144 {
145 int err;
146
147 err = -EINVAL;
148 switch (p->family) {
149 case AF_INET:
150 break;
151
152 case AF_INET6:
153 #if IS_ENABLED(CONFIG_IPV6)
154 break;
155 #else
156 err = -EAFNOSUPPORT;
157 goto out;
158 #endif
159
160 default:
161 goto out;
162 }
163
164 err = -EINVAL;
165 switch (p->id.proto) {
166 case IPPROTO_AH:
167 if ((!attrs[XFRMA_ALG_AUTH] &&
168 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
169 attrs[XFRMA_ALG_AEAD] ||
170 attrs[XFRMA_ALG_CRYPT] ||
171 attrs[XFRMA_ALG_COMP] ||
172 attrs[XFRMA_TFCPAD])
173 goto out;
174 break;
175
176 case IPPROTO_ESP:
177 if (attrs[XFRMA_ALG_COMP])
178 goto out;
179 if (!attrs[XFRMA_ALG_AUTH] &&
180 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
181 !attrs[XFRMA_ALG_CRYPT] &&
182 !attrs[XFRMA_ALG_AEAD])
183 goto out;
184 if ((attrs[XFRMA_ALG_AUTH] ||
185 attrs[XFRMA_ALG_AUTH_TRUNC] ||
186 attrs[XFRMA_ALG_CRYPT]) &&
187 attrs[XFRMA_ALG_AEAD])
188 goto out;
189 if (attrs[XFRMA_TFCPAD] &&
190 p->mode != XFRM_MODE_TUNNEL)
191 goto out;
192 break;
193
194 case IPPROTO_COMP:
195 if (!attrs[XFRMA_ALG_COMP] ||
196 attrs[XFRMA_ALG_AEAD] ||
197 attrs[XFRMA_ALG_AUTH] ||
198 attrs[XFRMA_ALG_AUTH_TRUNC] ||
199 attrs[XFRMA_ALG_CRYPT] ||
200 attrs[XFRMA_TFCPAD])
201 goto out;
202 break;
203
204 #if IS_ENABLED(CONFIG_IPV6)
205 case IPPROTO_DSTOPTS:
206 case IPPROTO_ROUTING:
207 if (attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AUTH] ||
209 attrs[XFRMA_ALG_AUTH_TRUNC] ||
210 attrs[XFRMA_ALG_AEAD] ||
211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_ENCAP] ||
213 attrs[XFRMA_SEC_CTX] ||
214 attrs[XFRMA_TFCPAD] ||
215 !attrs[XFRMA_COADDR])
216 goto out;
217 break;
218 #endif
219
220 default:
221 goto out;
222 }
223
224 if ((err = verify_aead(attrs)))
225 goto out;
226 if ((err = verify_auth_trunc(attrs)))
227 goto out;
228 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
229 goto out;
230 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
231 goto out;
232 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
233 goto out;
234 if ((err = verify_sec_ctx_len(attrs)))
235 goto out;
236 if ((err = verify_replay(p, attrs)))
237 goto out;
238
239 err = -EINVAL;
240 switch (p->mode) {
241 case XFRM_MODE_TRANSPORT:
242 case XFRM_MODE_TUNNEL:
243 case XFRM_MODE_ROUTEOPTIMIZATION:
244 case XFRM_MODE_BEET:
245 break;
246
247 default:
248 goto out;
249 }
250
251 err = 0;
252
253 out:
254 return err;
255 }
256
257 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
258 struct xfrm_algo_desc *(*get_byname)(const char *, int),
259 struct nlattr *rta)
260 {
261 struct xfrm_algo *p, *ualg;
262 struct xfrm_algo_desc *algo;
263
264 if (!rta)
265 return 0;
266
267 ualg = nla_data(rta);
268
269 algo = get_byname(ualg->alg_name, 1);
270 if (!algo)
271 return -ENOSYS;
272 *props = algo->desc.sadb_alg_id;
273
274 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
275 if (!p)
276 return -ENOMEM;
277
278 strcpy(p->alg_name, algo->name);
279 *algpp = p;
280 return 0;
281 }
282
283 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
284 struct nlattr *rta)
285 {
286 struct xfrm_algo *ualg;
287 struct xfrm_algo_auth *p;
288 struct xfrm_algo_desc *algo;
289
290 if (!rta)
291 return 0;
292
293 ualg = nla_data(rta);
294
295 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
296 if (!algo)
297 return -ENOSYS;
298 *props = algo->desc.sadb_alg_id;
299
300 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
301 if (!p)
302 return -ENOMEM;
303
304 strcpy(p->alg_name, algo->name);
305 p->alg_key_len = ualg->alg_key_len;
306 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
307 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
308
309 *algpp = p;
310 return 0;
311 }
312
313 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315 {
316 struct xfrm_algo_auth *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
327 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
328 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
329 return -EINVAL;
330 *props = algo->desc.sadb_alg_id;
331
332 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
333 if (!p)
334 return -ENOMEM;
335
336 strcpy(p->alg_name, algo->name);
337 if (!p->alg_trunc_len)
338 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
339
340 *algpp = p;
341 return 0;
342 }
343
344 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
345 struct nlattr *rta)
346 {
347 struct xfrm_algo_aead *p, *ualg;
348 struct xfrm_algo_desc *algo;
349
350 if (!rta)
351 return 0;
352
353 ualg = nla_data(rta);
354
355 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
356 if (!algo)
357 return -ENOSYS;
358 *props = algo->desc.sadb_alg_id;
359
360 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
361 if (!p)
362 return -ENOMEM;
363
364 strcpy(p->alg_name, algo->name);
365 *algpp = p;
366 return 0;
367 }
368
369 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
370 struct nlattr *rp)
371 {
372 struct xfrm_replay_state_esn *up;
373
374 if (!replay_esn || !rp)
375 return 0;
376
377 up = nla_data(rp);
378
379 if (xfrm_replay_state_esn_len(replay_esn) !=
380 xfrm_replay_state_esn_len(up))
381 return -EINVAL;
382
383 return 0;
384 }
385
386 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
387 struct xfrm_replay_state_esn **preplay_esn,
388 struct nlattr *rta)
389 {
390 struct xfrm_replay_state_esn *p, *pp, *up;
391
392 if (!rta)
393 return 0;
394
395 up = nla_data(rta);
396
397 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
398 if (!p)
399 return -ENOMEM;
400
401 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
402 if (!pp) {
403 kfree(p);
404 return -ENOMEM;
405 }
406
407 *replay_esn = p;
408 *preplay_esn = pp;
409
410 return 0;
411 }
412
413 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
414 {
415 int len = 0;
416
417 if (xfrm_ctx) {
418 len += sizeof(struct xfrm_user_sec_ctx);
419 len += xfrm_ctx->ctx_len;
420 }
421 return len;
422 }
423
424 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
425 {
426 memcpy(&x->id, &p->id, sizeof(x->id));
427 memcpy(&x->sel, &p->sel, sizeof(x->sel));
428 memcpy(&x->lft, &p->lft, sizeof(x->lft));
429 x->props.mode = p->mode;
430 x->props.replay_window = p->replay_window;
431 x->props.reqid = p->reqid;
432 x->props.family = p->family;
433 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
434 x->props.flags = p->flags;
435
436 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
437 x->sel.family = p->family;
438 }
439
440 /*
441 * someday when pfkey also has support, we could have the code
442 * somehow made shareable and move it to xfrm_state.c - JHS
443 *
444 */
445 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
446 {
447 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
448 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
449 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
450 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
451 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
452
453 if (re) {
454 struct xfrm_replay_state_esn *replay_esn;
455 replay_esn = nla_data(re);
456 memcpy(x->replay_esn, replay_esn,
457 xfrm_replay_state_esn_len(replay_esn));
458 memcpy(x->preplay_esn, replay_esn,
459 xfrm_replay_state_esn_len(replay_esn));
460 }
461
462 if (rp) {
463 struct xfrm_replay_state *replay;
464 replay = nla_data(rp);
465 memcpy(&x->replay, replay, sizeof(*replay));
466 memcpy(&x->preplay, replay, sizeof(*replay));
467 }
468
469 if (lt) {
470 struct xfrm_lifetime_cur *ltime;
471 ltime = nla_data(lt);
472 x->curlft.bytes = ltime->bytes;
473 x->curlft.packets = ltime->packets;
474 x->curlft.add_time = ltime->add_time;
475 x->curlft.use_time = ltime->use_time;
476 }
477
478 if (et)
479 x->replay_maxage = nla_get_u32(et);
480
481 if (rt)
482 x->replay_maxdiff = nla_get_u32(rt);
483 }
484
485 static struct xfrm_state *xfrm_state_construct(struct net *net,
486 struct xfrm_usersa_info *p,
487 struct nlattr **attrs,
488 int *errp)
489 {
490 struct xfrm_state *x = xfrm_state_alloc(net);
491 int err = -ENOMEM;
492
493 if (!x)
494 goto error_no_put;
495
496 copy_from_user_state(x, p);
497
498 if ((err = attach_aead(&x->aead, &x->props.ealgo,
499 attrs[XFRMA_ALG_AEAD])))
500 goto error;
501 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
502 attrs[XFRMA_ALG_AUTH_TRUNC])))
503 goto error;
504 if (!x->props.aalgo) {
505 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
506 attrs[XFRMA_ALG_AUTH])))
507 goto error;
508 }
509 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
510 xfrm_ealg_get_byname,
511 attrs[XFRMA_ALG_CRYPT])))
512 goto error;
513 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
514 xfrm_calg_get_byname,
515 attrs[XFRMA_ALG_COMP])))
516 goto error;
517
518 if (attrs[XFRMA_ENCAP]) {
519 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
520 sizeof(*x->encap), GFP_KERNEL);
521 if (x->encap == NULL)
522 goto error;
523 }
524
525 if (attrs[XFRMA_TFCPAD])
526 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
527
528 if (attrs[XFRMA_COADDR]) {
529 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
530 sizeof(*x->coaddr), GFP_KERNEL);
531 if (x->coaddr == NULL)
532 goto error;
533 }
534
535 xfrm_mark_get(attrs, &x->mark);
536
537 err = __xfrm_init_state(x, false);
538 if (err)
539 goto error;
540
541 if (attrs[XFRMA_SEC_CTX] &&
542 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
543 goto error;
544
545 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
546 attrs[XFRMA_REPLAY_ESN_VAL])))
547 goto error;
548
549 x->km.seq = p->seq;
550 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
551 /* sysctl_xfrm_aevent_etime is in 100ms units */
552 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
553
554 if ((err = xfrm_init_replay(x)))
555 goto error;
556
557 /* override default values from above */
558 xfrm_update_ae_params(x, attrs);
559
560 return x;
561
562 error:
563 x->km.state = XFRM_STATE_DEAD;
564 xfrm_state_put(x);
565 error_no_put:
566 *errp = err;
567 return NULL;
568 }
569
570 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
571 struct nlattr **attrs)
572 {
573 struct net *net = sock_net(skb->sk);
574 struct xfrm_usersa_info *p = nlmsg_data(nlh);
575 struct xfrm_state *x;
576 int err;
577 struct km_event c;
578 uid_t loginuid = audit_get_loginuid(current);
579 u32 sessionid = audit_get_sessionid(current);
580 u32 sid;
581
582 err = verify_newsa_info(p, attrs);
583 if (err)
584 return err;
585
586 x = xfrm_state_construct(net, p, attrs, &err);
587 if (!x)
588 return err;
589
590 xfrm_state_hold(x);
591 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
592 err = xfrm_state_add(x);
593 else
594 err = xfrm_state_update(x);
595
596 security_task_getsecid(current, &sid);
597 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
598
599 if (err < 0) {
600 x->km.state = XFRM_STATE_DEAD;
601 __xfrm_state_put(x);
602 goto out;
603 }
604
605 c.seq = nlh->nlmsg_seq;
606 c.pid = nlh->nlmsg_pid;
607 c.event = nlh->nlmsg_type;
608
609 km_state_notify(x, &c);
610 out:
611 xfrm_state_put(x);
612 return err;
613 }
614
615 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
616 struct xfrm_usersa_id *p,
617 struct nlattr **attrs,
618 int *errp)
619 {
620 struct xfrm_state *x = NULL;
621 struct xfrm_mark m;
622 int err;
623 u32 mark = xfrm_mark_get(attrs, &m);
624
625 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
626 err = -ESRCH;
627 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
628 } else {
629 xfrm_address_t *saddr = NULL;
630
631 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
632 if (!saddr) {
633 err = -EINVAL;
634 goto out;
635 }
636
637 err = -ESRCH;
638 x = xfrm_state_lookup_byaddr(net, mark,
639 &p->daddr, saddr,
640 p->proto, p->family);
641 }
642
643 out:
644 if (!x && errp)
645 *errp = err;
646 return x;
647 }
648
649 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
650 struct nlattr **attrs)
651 {
652 struct net *net = sock_net(skb->sk);
653 struct xfrm_state *x;
654 int err = -ESRCH;
655 struct km_event c;
656 struct xfrm_usersa_id *p = nlmsg_data(nlh);
657 uid_t loginuid = audit_get_loginuid(current);
658 u32 sessionid = audit_get_sessionid(current);
659 u32 sid;
660
661 x = xfrm_user_state_lookup(net, p, attrs, &err);
662 if (x == NULL)
663 return err;
664
665 if ((err = security_xfrm_state_delete(x)) != 0)
666 goto out;
667
668 if (xfrm_state_kern(x)) {
669 err = -EPERM;
670 goto out;
671 }
672
673 err = xfrm_state_delete(x);
674
675 if (err < 0)
676 goto out;
677
678 c.seq = nlh->nlmsg_seq;
679 c.pid = nlh->nlmsg_pid;
680 c.event = nlh->nlmsg_type;
681 km_state_notify(x, &c);
682
683 out:
684 security_task_getsecid(current, &sid);
685 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
686 xfrm_state_put(x);
687 return err;
688 }
689
690 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
691 {
692 memcpy(&p->id, &x->id, sizeof(p->id));
693 memcpy(&p->sel, &x->sel, sizeof(p->sel));
694 memcpy(&p->lft, &x->lft, sizeof(p->lft));
695 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
696 memcpy(&p->stats, &x->stats, sizeof(p->stats));
697 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
698 p->mode = x->props.mode;
699 p->replay_window = x->props.replay_window;
700 p->reqid = x->props.reqid;
701 p->family = x->props.family;
702 p->flags = x->props.flags;
703 p->seq = x->km.seq;
704 }
705
706 struct xfrm_dump_info {
707 struct sk_buff *in_skb;
708 struct sk_buff *out_skb;
709 u32 nlmsg_seq;
710 u16 nlmsg_flags;
711 };
712
713 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
714 {
715 struct xfrm_user_sec_ctx *uctx;
716 struct nlattr *attr;
717 int ctx_size = sizeof(*uctx) + s->ctx_len;
718
719 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
720 if (attr == NULL)
721 return -EMSGSIZE;
722
723 uctx = nla_data(attr);
724 uctx->exttype = XFRMA_SEC_CTX;
725 uctx->len = ctx_size;
726 uctx->ctx_doi = s->ctx_doi;
727 uctx->ctx_alg = s->ctx_alg;
728 uctx->ctx_len = s->ctx_len;
729 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
730
731 return 0;
732 }
733
734 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
735 {
736 struct xfrm_algo *algo;
737 struct nlattr *nla;
738
739 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
740 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
741 if (!nla)
742 return -EMSGSIZE;
743
744 algo = nla_data(nla);
745 strcpy(algo->alg_name, auth->alg_name);
746 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
747 algo->alg_key_len = auth->alg_key_len;
748
749 return 0;
750 }
751
752 /* Don't change this without updating xfrm_sa_len! */
753 static int copy_to_user_state_extra(struct xfrm_state *x,
754 struct xfrm_usersa_info *p,
755 struct sk_buff *skb)
756 {
757 int ret = 0;
758
759 copy_to_user_state(x, p);
760
761 if (x->coaddr) {
762 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
763 if (ret)
764 goto out;
765 }
766 if (x->lastused) {
767 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
768 if (ret)
769 goto out;
770 }
771 if (x->aead) {
772 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
773 if (ret)
774 goto out;
775 }
776 if (x->aalg) {
777 ret = copy_to_user_auth(x->aalg, skb);
778 if (!ret)
779 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
780 xfrm_alg_auth_len(x->aalg), x->aalg);
781 if (ret)
782 goto out;
783 }
784 if (x->ealg) {
785 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
786 if (ret)
787 goto out;
788 }
789 if (x->calg) {
790 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
791 if (ret)
792 goto out;
793 }
794 if (x->encap) {
795 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
796 if (ret)
797 goto out;
798 }
799 if (x->tfcpad) {
800 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
801 if (ret)
802 goto out;
803 }
804 ret = xfrm_mark_put(skb, &x->mark);
805 if (ret)
806 goto out;
807 if (x->replay_esn) {
808 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
809 xfrm_replay_state_esn_len(x->replay_esn),
810 x->replay_esn);
811 if (ret)
812 goto out;
813 }
814 if (x->security)
815 ret = copy_sec_ctx(x->security, skb);
816 out:
817 return ret;
818 }
819
820 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
821 {
822 struct xfrm_dump_info *sp = ptr;
823 struct sk_buff *in_skb = sp->in_skb;
824 struct sk_buff *skb = sp->out_skb;
825 struct xfrm_usersa_info *p;
826 struct nlmsghdr *nlh;
827 int err;
828
829 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
830 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
831 if (nlh == NULL)
832 return -EMSGSIZE;
833
834 p = nlmsg_data(nlh);
835
836 err = copy_to_user_state_extra(x, p, skb);
837 if (err) {
838 nlmsg_cancel(skb, nlh);
839 return err;
840 }
841 nlmsg_end(skb, nlh);
842 return 0;
843 }
844
845 static int xfrm_dump_sa_done(struct netlink_callback *cb)
846 {
847 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
848 xfrm_state_walk_done(walk);
849 return 0;
850 }
851
852 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
853 {
854 struct net *net = sock_net(skb->sk);
855 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
856 struct xfrm_dump_info info;
857
858 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
859 sizeof(cb->args) - sizeof(cb->args[0]));
860
861 info.in_skb = cb->skb;
862 info.out_skb = skb;
863 info.nlmsg_seq = cb->nlh->nlmsg_seq;
864 info.nlmsg_flags = NLM_F_MULTI;
865
866 if (!cb->args[0]) {
867 cb->args[0] = 1;
868 xfrm_state_walk_init(walk, 0);
869 }
870
871 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
872
873 return skb->len;
874 }
875
876 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
877 struct xfrm_state *x, u32 seq)
878 {
879 struct xfrm_dump_info info;
880 struct sk_buff *skb;
881 int err;
882
883 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
884 if (!skb)
885 return ERR_PTR(-ENOMEM);
886
887 info.in_skb = in_skb;
888 info.out_skb = skb;
889 info.nlmsg_seq = seq;
890 info.nlmsg_flags = 0;
891
892 err = dump_one_state(x, 0, &info);
893 if (err) {
894 kfree_skb(skb);
895 return ERR_PTR(err);
896 }
897
898 return skb;
899 }
900
901 static inline size_t xfrm_spdinfo_msgsize(void)
902 {
903 return NLMSG_ALIGN(4)
904 + nla_total_size(sizeof(struct xfrmu_spdinfo))
905 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
906 }
907
908 static int build_spdinfo(struct sk_buff *skb, struct net *net,
909 u32 pid, u32 seq, u32 flags)
910 {
911 struct xfrmk_spdinfo si;
912 struct xfrmu_spdinfo spc;
913 struct xfrmu_spdhinfo sph;
914 struct nlmsghdr *nlh;
915 int err;
916 u32 *f;
917
918 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
919 if (nlh == NULL) /* shouldn't really happen ... */
920 return -EMSGSIZE;
921
922 f = nlmsg_data(nlh);
923 *f = flags;
924 xfrm_spd_getinfo(net, &si);
925 spc.incnt = si.incnt;
926 spc.outcnt = si.outcnt;
927 spc.fwdcnt = si.fwdcnt;
928 spc.inscnt = si.inscnt;
929 spc.outscnt = si.outscnt;
930 spc.fwdscnt = si.fwdscnt;
931 sph.spdhcnt = si.spdhcnt;
932 sph.spdhmcnt = si.spdhmcnt;
933
934 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
935 if (!err)
936 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
937 if (err) {
938 nlmsg_cancel(skb, nlh);
939 return err;
940 }
941
942 return nlmsg_end(skb, nlh);
943 }
944
945 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
946 struct nlattr **attrs)
947 {
948 struct net *net = sock_net(skb->sk);
949 struct sk_buff *r_skb;
950 u32 *flags = nlmsg_data(nlh);
951 u32 spid = NETLINK_CB(skb).pid;
952 u32 seq = nlh->nlmsg_seq;
953
954 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
955 if (r_skb == NULL)
956 return -ENOMEM;
957
958 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
959 BUG();
960
961 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
962 }
963
964 static inline size_t xfrm_sadinfo_msgsize(void)
965 {
966 return NLMSG_ALIGN(4)
967 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
968 + nla_total_size(4); /* XFRMA_SAD_CNT */
969 }
970
971 static int build_sadinfo(struct sk_buff *skb, struct net *net,
972 u32 pid, u32 seq, u32 flags)
973 {
974 struct xfrmk_sadinfo si;
975 struct xfrmu_sadhinfo sh;
976 struct nlmsghdr *nlh;
977 int err;
978 u32 *f;
979
980 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
981 if (nlh == NULL) /* shouldn't really happen ... */
982 return -EMSGSIZE;
983
984 f = nlmsg_data(nlh);
985 *f = flags;
986 xfrm_sad_getinfo(net, &si);
987
988 sh.sadhmcnt = si.sadhmcnt;
989 sh.sadhcnt = si.sadhcnt;
990
991 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
992 if (!err)
993 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
994 if (err) {
995 nlmsg_cancel(skb, nlh);
996 return err;
997 }
998
999 return nlmsg_end(skb, nlh);
1000 }
1001
1002 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1003 struct nlattr **attrs)
1004 {
1005 struct net *net = sock_net(skb->sk);
1006 struct sk_buff *r_skb;
1007 u32 *flags = nlmsg_data(nlh);
1008 u32 spid = NETLINK_CB(skb).pid;
1009 u32 seq = nlh->nlmsg_seq;
1010
1011 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1012 if (r_skb == NULL)
1013 return -ENOMEM;
1014
1015 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
1016 BUG();
1017
1018 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
1019 }
1020
1021 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1022 struct nlattr **attrs)
1023 {
1024 struct net *net = sock_net(skb->sk);
1025 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1026 struct xfrm_state *x;
1027 struct sk_buff *resp_skb;
1028 int err = -ESRCH;
1029
1030 x = xfrm_user_state_lookup(net, p, attrs, &err);
1031 if (x == NULL)
1032 goto out_noput;
1033
1034 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1035 if (IS_ERR(resp_skb)) {
1036 err = PTR_ERR(resp_skb);
1037 } else {
1038 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1039 }
1040 xfrm_state_put(x);
1041 out_noput:
1042 return err;
1043 }
1044
1045 static int verify_userspi_info(struct xfrm_userspi_info *p)
1046 {
1047 switch (p->info.id.proto) {
1048 case IPPROTO_AH:
1049 case IPPROTO_ESP:
1050 break;
1051
1052 case IPPROTO_COMP:
1053 /* IPCOMP spi is 16-bits. */
1054 if (p->max >= 0x10000)
1055 return -EINVAL;
1056 break;
1057
1058 default:
1059 return -EINVAL;
1060 }
1061
1062 if (p->min > p->max)
1063 return -EINVAL;
1064
1065 return 0;
1066 }
1067
1068 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1069 struct nlattr **attrs)
1070 {
1071 struct net *net = sock_net(skb->sk);
1072 struct xfrm_state *x;
1073 struct xfrm_userspi_info *p;
1074 struct sk_buff *resp_skb;
1075 xfrm_address_t *daddr;
1076 int family;
1077 int err;
1078 u32 mark;
1079 struct xfrm_mark m;
1080
1081 p = nlmsg_data(nlh);
1082 err = verify_userspi_info(p);
1083 if (err)
1084 goto out_noput;
1085
1086 family = p->info.family;
1087 daddr = &p->info.id.daddr;
1088
1089 x = NULL;
1090
1091 mark = xfrm_mark_get(attrs, &m);
1092 if (p->info.seq) {
1093 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1094 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1095 xfrm_state_put(x);
1096 x = NULL;
1097 }
1098 }
1099
1100 if (!x)
1101 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1102 p->info.id.proto, daddr,
1103 &p->info.saddr, 1,
1104 family);
1105 err = -ENOENT;
1106 if (x == NULL)
1107 goto out_noput;
1108
1109 err = xfrm_alloc_spi(x, p->min, p->max);
1110 if (err)
1111 goto out;
1112
1113 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1114 if (IS_ERR(resp_skb)) {
1115 err = PTR_ERR(resp_skb);
1116 goto out;
1117 }
1118
1119 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1120
1121 out:
1122 xfrm_state_put(x);
1123 out_noput:
1124 return err;
1125 }
1126
1127 static int verify_policy_dir(u8 dir)
1128 {
1129 switch (dir) {
1130 case XFRM_POLICY_IN:
1131 case XFRM_POLICY_OUT:
1132 case XFRM_POLICY_FWD:
1133 break;
1134
1135 default:
1136 return -EINVAL;
1137 }
1138
1139 return 0;
1140 }
1141
1142 static int verify_policy_type(u8 type)
1143 {
1144 switch (type) {
1145 case XFRM_POLICY_TYPE_MAIN:
1146 #ifdef CONFIG_XFRM_SUB_POLICY
1147 case XFRM_POLICY_TYPE_SUB:
1148 #endif
1149 break;
1150
1151 default:
1152 return -EINVAL;
1153 }
1154
1155 return 0;
1156 }
1157
1158 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1159 {
1160 switch (p->share) {
1161 case XFRM_SHARE_ANY:
1162 case XFRM_SHARE_SESSION:
1163 case XFRM_SHARE_USER:
1164 case XFRM_SHARE_UNIQUE:
1165 break;
1166
1167 default:
1168 return -EINVAL;
1169 }
1170
1171 switch (p->action) {
1172 case XFRM_POLICY_ALLOW:
1173 case XFRM_POLICY_BLOCK:
1174 break;
1175
1176 default:
1177 return -EINVAL;
1178 }
1179
1180 switch (p->sel.family) {
1181 case AF_INET:
1182 break;
1183
1184 case AF_INET6:
1185 #if IS_ENABLED(CONFIG_IPV6)
1186 break;
1187 #else
1188 return -EAFNOSUPPORT;
1189 #endif
1190
1191 default:
1192 return -EINVAL;
1193 }
1194
1195 return verify_policy_dir(p->dir);
1196 }
1197
1198 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1199 {
1200 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1201 struct xfrm_user_sec_ctx *uctx;
1202
1203 if (!rt)
1204 return 0;
1205
1206 uctx = nla_data(rt);
1207 return security_xfrm_policy_alloc(&pol->security, uctx);
1208 }
1209
1210 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1211 int nr)
1212 {
1213 int i;
1214
1215 xp->xfrm_nr = nr;
1216 for (i = 0; i < nr; i++, ut++) {
1217 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1218
1219 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1220 memcpy(&t->saddr, &ut->saddr,
1221 sizeof(xfrm_address_t));
1222 t->reqid = ut->reqid;
1223 t->mode = ut->mode;
1224 t->share = ut->share;
1225 t->optional = ut->optional;
1226 t->aalgos = ut->aalgos;
1227 t->ealgos = ut->ealgos;
1228 t->calgos = ut->calgos;
1229 /* If all masks are ~0, then we allow all algorithms. */
1230 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1231 t->encap_family = ut->family;
1232 }
1233 }
1234
1235 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1236 {
1237 int i;
1238
1239 if (nr > XFRM_MAX_DEPTH)
1240 return -EINVAL;
1241
1242 for (i = 0; i < nr; i++) {
1243 /* We never validated the ut->family value, so many
1244 * applications simply leave it at zero. The check was
1245 * never made and ut->family was ignored because all
1246 * templates could be assumed to have the same family as
1247 * the policy itself. Now that we will have ipv4-in-ipv6
1248 * and ipv6-in-ipv4 tunnels, this is no longer true.
1249 */
1250 if (!ut[i].family)
1251 ut[i].family = family;
1252
1253 switch (ut[i].family) {
1254 case AF_INET:
1255 break;
1256 #if IS_ENABLED(CONFIG_IPV6)
1257 case AF_INET6:
1258 break;
1259 #endif
1260 default:
1261 return -EINVAL;
1262 }
1263 }
1264
1265 return 0;
1266 }
1267
1268 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1269 {
1270 struct nlattr *rt = attrs[XFRMA_TMPL];
1271
1272 if (!rt) {
1273 pol->xfrm_nr = 0;
1274 } else {
1275 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1276 int nr = nla_len(rt) / sizeof(*utmpl);
1277 int err;
1278
1279 err = validate_tmpl(nr, utmpl, pol->family);
1280 if (err)
1281 return err;
1282
1283 copy_templates(pol, utmpl, nr);
1284 }
1285 return 0;
1286 }
1287
1288 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1289 {
1290 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1291 struct xfrm_userpolicy_type *upt;
1292 u8 type = XFRM_POLICY_TYPE_MAIN;
1293 int err;
1294
1295 if (rt) {
1296 upt = nla_data(rt);
1297 type = upt->type;
1298 }
1299
1300 err = verify_policy_type(type);
1301 if (err)
1302 return err;
1303
1304 *tp = type;
1305 return 0;
1306 }
1307
1308 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1309 {
1310 xp->priority = p->priority;
1311 xp->index = p->index;
1312 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1313 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1314 xp->action = p->action;
1315 xp->flags = p->flags;
1316 xp->family = p->sel.family;
1317 /* XXX xp->share = p->share; */
1318 }
1319
1320 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1321 {
1322 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1323 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1324 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1325 p->priority = xp->priority;
1326 p->index = xp->index;
1327 p->sel.family = xp->family;
1328 p->dir = dir;
1329 p->action = xp->action;
1330 p->flags = xp->flags;
1331 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1332 }
1333
1334 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1335 {
1336 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1337 int err;
1338
1339 if (!xp) {
1340 *errp = -ENOMEM;
1341 return NULL;
1342 }
1343
1344 copy_from_user_policy(xp, p);
1345
1346 err = copy_from_user_policy_type(&xp->type, attrs);
1347 if (err)
1348 goto error;
1349
1350 if (!(err = copy_from_user_tmpl(xp, attrs)))
1351 err = copy_from_user_sec_ctx(xp, attrs);
1352 if (err)
1353 goto error;
1354
1355 xfrm_mark_get(attrs, &xp->mark);
1356
1357 return xp;
1358 error:
1359 *errp = err;
1360 xp->walk.dead = 1;
1361 xfrm_policy_destroy(xp);
1362 return NULL;
1363 }
1364
1365 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1366 struct nlattr **attrs)
1367 {
1368 struct net *net = sock_net(skb->sk);
1369 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1370 struct xfrm_policy *xp;
1371 struct km_event c;
1372 int err;
1373 int excl;
1374 uid_t loginuid = audit_get_loginuid(current);
1375 u32 sessionid = audit_get_sessionid(current);
1376 u32 sid;
1377
1378 err = verify_newpolicy_info(p);
1379 if (err)
1380 return err;
1381 err = verify_sec_ctx_len(attrs);
1382 if (err)
1383 return err;
1384
1385 xp = xfrm_policy_construct(net, p, attrs, &err);
1386 if (!xp)
1387 return err;
1388
1389 /* shouldn't excl be based on nlh flags??
1390 * Aha! this is anti-netlink really i.e more pfkey derived
1391 * in netlink excl is a flag and you wouldnt need
1392 * a type XFRM_MSG_UPDPOLICY - JHS */
1393 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1394 err = xfrm_policy_insert(p->dir, xp, excl);
1395 security_task_getsecid(current, &sid);
1396 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1397
1398 if (err) {
1399 security_xfrm_policy_free(xp->security);
1400 kfree(xp);
1401 return err;
1402 }
1403
1404 c.event = nlh->nlmsg_type;
1405 c.seq = nlh->nlmsg_seq;
1406 c.pid = nlh->nlmsg_pid;
1407 km_policy_notify(xp, p->dir, &c);
1408
1409 xfrm_pol_put(xp);
1410
1411 return 0;
1412 }
1413
1414 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1415 {
1416 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1417 int i;
1418
1419 if (xp->xfrm_nr == 0)
1420 return 0;
1421
1422 for (i = 0; i < xp->xfrm_nr; i++) {
1423 struct xfrm_user_tmpl *up = &vec[i];
1424 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1425
1426 memcpy(&up->id, &kp->id, sizeof(up->id));
1427 up->family = kp->encap_family;
1428 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1429 up->reqid = kp->reqid;
1430 up->mode = kp->mode;
1431 up->share = kp->share;
1432 up->optional = kp->optional;
1433 up->aalgos = kp->aalgos;
1434 up->ealgos = kp->ealgos;
1435 up->calgos = kp->calgos;
1436 }
1437
1438 return nla_put(skb, XFRMA_TMPL,
1439 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1440 }
1441
1442 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1443 {
1444 if (x->security) {
1445 return copy_sec_ctx(x->security, skb);
1446 }
1447 return 0;
1448 }
1449
1450 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1451 {
1452 if (xp->security)
1453 return copy_sec_ctx(xp->security, skb);
1454 return 0;
1455 }
1456 static inline size_t userpolicy_type_attrsize(void)
1457 {
1458 #ifdef CONFIG_XFRM_SUB_POLICY
1459 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1460 #else
1461 return 0;
1462 #endif
1463 }
1464
1465 #ifdef CONFIG_XFRM_SUB_POLICY
1466 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1467 {
1468 struct xfrm_userpolicy_type upt = {
1469 .type = type,
1470 };
1471
1472 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1473 }
1474
1475 #else
1476 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1477 {
1478 return 0;
1479 }
1480 #endif
1481
1482 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1483 {
1484 struct xfrm_dump_info *sp = ptr;
1485 struct xfrm_userpolicy_info *p;
1486 struct sk_buff *in_skb = sp->in_skb;
1487 struct sk_buff *skb = sp->out_skb;
1488 struct nlmsghdr *nlh;
1489 int err;
1490
1491 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1492 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1493 if (nlh == NULL)
1494 return -EMSGSIZE;
1495
1496 p = nlmsg_data(nlh);
1497 copy_to_user_policy(xp, p, dir);
1498 err = copy_to_user_tmpl(xp, skb);
1499 if (!err)
1500 err = copy_to_user_sec_ctx(xp, skb);
1501 if (!err)
1502 err = copy_to_user_policy_type(xp->type, skb);
1503 if (!err)
1504 err = xfrm_mark_put(skb, &xp->mark);
1505 if (err) {
1506 nlmsg_cancel(skb, nlh);
1507 return err;
1508 }
1509 nlmsg_end(skb, nlh);
1510 return 0;
1511 }
1512
1513 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1514 {
1515 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1516
1517 xfrm_policy_walk_done(walk);
1518 return 0;
1519 }
1520
1521 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1522 {
1523 struct net *net = sock_net(skb->sk);
1524 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1525 struct xfrm_dump_info info;
1526
1527 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1528 sizeof(cb->args) - sizeof(cb->args[0]));
1529
1530 info.in_skb = cb->skb;
1531 info.out_skb = skb;
1532 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1533 info.nlmsg_flags = NLM_F_MULTI;
1534
1535 if (!cb->args[0]) {
1536 cb->args[0] = 1;
1537 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1538 }
1539
1540 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1541
1542 return skb->len;
1543 }
1544
1545 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1546 struct xfrm_policy *xp,
1547 int dir, u32 seq)
1548 {
1549 struct xfrm_dump_info info;
1550 struct sk_buff *skb;
1551
1552 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1553 if (!skb)
1554 return ERR_PTR(-ENOMEM);
1555
1556 info.in_skb = in_skb;
1557 info.out_skb = skb;
1558 info.nlmsg_seq = seq;
1559 info.nlmsg_flags = 0;
1560
1561 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1562 kfree_skb(skb);
1563 return NULL;
1564 }
1565
1566 return skb;
1567 }
1568
1569 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1570 struct nlattr **attrs)
1571 {
1572 struct net *net = sock_net(skb->sk);
1573 struct xfrm_policy *xp;
1574 struct xfrm_userpolicy_id *p;
1575 u8 type = XFRM_POLICY_TYPE_MAIN;
1576 int err;
1577 struct km_event c;
1578 int delete;
1579 struct xfrm_mark m;
1580 u32 mark = xfrm_mark_get(attrs, &m);
1581
1582 p = nlmsg_data(nlh);
1583 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1584
1585 err = copy_from_user_policy_type(&type, attrs);
1586 if (err)
1587 return err;
1588
1589 err = verify_policy_dir(p->dir);
1590 if (err)
1591 return err;
1592
1593 if (p->index)
1594 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1595 else {
1596 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1597 struct xfrm_sec_ctx *ctx;
1598
1599 err = verify_sec_ctx_len(attrs);
1600 if (err)
1601 return err;
1602
1603 ctx = NULL;
1604 if (rt) {
1605 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1606
1607 err = security_xfrm_policy_alloc(&ctx, uctx);
1608 if (err)
1609 return err;
1610 }
1611 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1612 ctx, delete, &err);
1613 security_xfrm_policy_free(ctx);
1614 }
1615 if (xp == NULL)
1616 return -ENOENT;
1617
1618 if (!delete) {
1619 struct sk_buff *resp_skb;
1620
1621 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1622 if (IS_ERR(resp_skb)) {
1623 err = PTR_ERR(resp_skb);
1624 } else {
1625 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1626 NETLINK_CB(skb).pid);
1627 }
1628 } else {
1629 uid_t loginuid = audit_get_loginuid(current);
1630 u32 sessionid = audit_get_sessionid(current);
1631 u32 sid;
1632
1633 security_task_getsecid(current, &sid);
1634 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1635 sid);
1636
1637 if (err != 0)
1638 goto out;
1639
1640 c.data.byid = p->index;
1641 c.event = nlh->nlmsg_type;
1642 c.seq = nlh->nlmsg_seq;
1643 c.pid = nlh->nlmsg_pid;
1644 km_policy_notify(xp, p->dir, &c);
1645 }
1646
1647 out:
1648 xfrm_pol_put(xp);
1649 return err;
1650 }
1651
1652 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1653 struct nlattr **attrs)
1654 {
1655 struct net *net = sock_net(skb->sk);
1656 struct km_event c;
1657 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1658 struct xfrm_audit audit_info;
1659 int err;
1660
1661 audit_info.loginuid = audit_get_loginuid(current);
1662 audit_info.sessionid = audit_get_sessionid(current);
1663 security_task_getsecid(current, &audit_info.secid);
1664 err = xfrm_state_flush(net, p->proto, &audit_info);
1665 if (err) {
1666 if (err == -ESRCH) /* empty table */
1667 return 0;
1668 return err;
1669 }
1670 c.data.proto = p->proto;
1671 c.event = nlh->nlmsg_type;
1672 c.seq = nlh->nlmsg_seq;
1673 c.pid = nlh->nlmsg_pid;
1674 c.net = net;
1675 km_state_notify(NULL, &c);
1676
1677 return 0;
1678 }
1679
1680 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1681 {
1682 size_t replay_size = x->replay_esn ?
1683 xfrm_replay_state_esn_len(x->replay_esn) :
1684 sizeof(struct xfrm_replay_state);
1685
1686 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1687 + nla_total_size(replay_size)
1688 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1689 + nla_total_size(sizeof(struct xfrm_mark))
1690 + nla_total_size(4) /* XFRM_AE_RTHR */
1691 + nla_total_size(4); /* XFRM_AE_ETHR */
1692 }
1693
1694 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1695 {
1696 struct xfrm_aevent_id *id;
1697 struct nlmsghdr *nlh;
1698 int err;
1699
1700 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1701 if (nlh == NULL)
1702 return -EMSGSIZE;
1703
1704 id = nlmsg_data(nlh);
1705 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1706 id->sa_id.spi = x->id.spi;
1707 id->sa_id.family = x->props.family;
1708 id->sa_id.proto = x->id.proto;
1709 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1710 id->reqid = x->props.reqid;
1711 id->flags = c->data.aevent;
1712
1713 if (x->replay_esn) {
1714 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1715 xfrm_replay_state_esn_len(x->replay_esn),
1716 x->replay_esn);
1717 } else {
1718 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1719 &x->replay);
1720 }
1721 if (err)
1722 goto out_cancel;
1723 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1724 if (err)
1725 goto out_cancel;
1726
1727 if (id->flags & XFRM_AE_RTHR) {
1728 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1729 if (err)
1730 goto out_cancel;
1731 }
1732 if (id->flags & XFRM_AE_ETHR) {
1733 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1734 x->replay_maxage * 10 / HZ);
1735 if (err)
1736 goto out_cancel;
1737 }
1738 err = xfrm_mark_put(skb, &x->mark);
1739 if (err)
1740 goto out_cancel;
1741
1742 return nlmsg_end(skb, nlh);
1743
1744 out_cancel:
1745 nlmsg_cancel(skb, nlh);
1746 return err;
1747 }
1748
1749 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1750 struct nlattr **attrs)
1751 {
1752 struct net *net = sock_net(skb->sk);
1753 struct xfrm_state *x;
1754 struct sk_buff *r_skb;
1755 int err;
1756 struct km_event c;
1757 u32 mark;
1758 struct xfrm_mark m;
1759 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1760 struct xfrm_usersa_id *id = &p->sa_id;
1761
1762 mark = xfrm_mark_get(attrs, &m);
1763
1764 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1765 if (x == NULL)
1766 return -ESRCH;
1767
1768 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1769 if (r_skb == NULL) {
1770 xfrm_state_put(x);
1771 return -ENOMEM;
1772 }
1773
1774 /*
1775 * XXX: is this lock really needed - none of the other
1776 * gets lock (the concern is things getting updated
1777 * while we are still reading) - jhs
1778 */
1779 spin_lock_bh(&x->lock);
1780 c.data.aevent = p->flags;
1781 c.seq = nlh->nlmsg_seq;
1782 c.pid = nlh->nlmsg_pid;
1783
1784 if (build_aevent(r_skb, x, &c) < 0)
1785 BUG();
1786 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1787 spin_unlock_bh(&x->lock);
1788 xfrm_state_put(x);
1789 return err;
1790 }
1791
1792 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1793 struct nlattr **attrs)
1794 {
1795 struct net *net = sock_net(skb->sk);
1796 struct xfrm_state *x;
1797 struct km_event c;
1798 int err = - EINVAL;
1799 u32 mark = 0;
1800 struct xfrm_mark m;
1801 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1802 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1803 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1804 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1805
1806 if (!lt && !rp && !re)
1807 return err;
1808
1809 /* pedantic mode - thou shalt sayeth replaceth */
1810 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1811 return err;
1812
1813 mark = xfrm_mark_get(attrs, &m);
1814
1815 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1816 if (x == NULL)
1817 return -ESRCH;
1818
1819 if (x->km.state != XFRM_STATE_VALID)
1820 goto out;
1821
1822 err = xfrm_replay_verify_len(x->replay_esn, rp);
1823 if (err)
1824 goto out;
1825
1826 spin_lock_bh(&x->lock);
1827 xfrm_update_ae_params(x, attrs);
1828 spin_unlock_bh(&x->lock);
1829
1830 c.event = nlh->nlmsg_type;
1831 c.seq = nlh->nlmsg_seq;
1832 c.pid = nlh->nlmsg_pid;
1833 c.data.aevent = XFRM_AE_CU;
1834 km_state_notify(x, &c);
1835 err = 0;
1836 out:
1837 xfrm_state_put(x);
1838 return err;
1839 }
1840
1841 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1842 struct nlattr **attrs)
1843 {
1844 struct net *net = sock_net(skb->sk);
1845 struct km_event c;
1846 u8 type = XFRM_POLICY_TYPE_MAIN;
1847 int err;
1848 struct xfrm_audit audit_info;
1849
1850 err = copy_from_user_policy_type(&type, attrs);
1851 if (err)
1852 return err;
1853
1854 audit_info.loginuid = audit_get_loginuid(current);
1855 audit_info.sessionid = audit_get_sessionid(current);
1856 security_task_getsecid(current, &audit_info.secid);
1857 err = xfrm_policy_flush(net, type, &audit_info);
1858 if (err) {
1859 if (err == -ESRCH) /* empty table */
1860 return 0;
1861 return err;
1862 }
1863
1864 c.data.type = type;
1865 c.event = nlh->nlmsg_type;
1866 c.seq = nlh->nlmsg_seq;
1867 c.pid = nlh->nlmsg_pid;
1868 c.net = net;
1869 km_policy_notify(NULL, 0, &c);
1870 return 0;
1871 }
1872
1873 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1874 struct nlattr **attrs)
1875 {
1876 struct net *net = sock_net(skb->sk);
1877 struct xfrm_policy *xp;
1878 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1879 struct xfrm_userpolicy_info *p = &up->pol;
1880 u8 type = XFRM_POLICY_TYPE_MAIN;
1881 int err = -ENOENT;
1882 struct xfrm_mark m;
1883 u32 mark = xfrm_mark_get(attrs, &m);
1884
1885 err = copy_from_user_policy_type(&type, attrs);
1886 if (err)
1887 return err;
1888
1889 err = verify_policy_dir(p->dir);
1890 if (err)
1891 return err;
1892
1893 if (p->index)
1894 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1895 else {
1896 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1897 struct xfrm_sec_ctx *ctx;
1898
1899 err = verify_sec_ctx_len(attrs);
1900 if (err)
1901 return err;
1902
1903 ctx = NULL;
1904 if (rt) {
1905 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1906
1907 err = security_xfrm_policy_alloc(&ctx, uctx);
1908 if (err)
1909 return err;
1910 }
1911 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1912 &p->sel, ctx, 0, &err);
1913 security_xfrm_policy_free(ctx);
1914 }
1915 if (xp == NULL)
1916 return -ENOENT;
1917
1918 if (unlikely(xp->walk.dead))
1919 goto out;
1920
1921 err = 0;
1922 if (up->hard) {
1923 uid_t loginuid = audit_get_loginuid(current);
1924 u32 sessionid = audit_get_sessionid(current);
1925 u32 sid;
1926
1927 security_task_getsecid(current, &sid);
1928 xfrm_policy_delete(xp, p->dir);
1929 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1930
1931 } else {
1932 // reset the timers here?
1933 WARN(1, "Dont know what to do with soft policy expire\n");
1934 }
1935 km_policy_expired(xp, p->dir, up->hard, current->pid);
1936
1937 out:
1938 xfrm_pol_put(xp);
1939 return err;
1940 }
1941
1942 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1943 struct nlattr **attrs)
1944 {
1945 struct net *net = sock_net(skb->sk);
1946 struct xfrm_state *x;
1947 int err;
1948 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1949 struct xfrm_usersa_info *p = &ue->state;
1950 struct xfrm_mark m;
1951 u32 mark = xfrm_mark_get(attrs, &m);
1952
1953 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1954
1955 err = -ENOENT;
1956 if (x == NULL)
1957 return err;
1958
1959 spin_lock_bh(&x->lock);
1960 err = -EINVAL;
1961 if (x->km.state != XFRM_STATE_VALID)
1962 goto out;
1963 km_state_expired(x, ue->hard, current->pid);
1964
1965 if (ue->hard) {
1966 uid_t loginuid = audit_get_loginuid(current);
1967 u32 sessionid = audit_get_sessionid(current);
1968 u32 sid;
1969
1970 security_task_getsecid(current, &sid);
1971 __xfrm_state_delete(x);
1972 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1973 }
1974 err = 0;
1975 out:
1976 spin_unlock_bh(&x->lock);
1977 xfrm_state_put(x);
1978 return err;
1979 }
1980
1981 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1982 struct nlattr **attrs)
1983 {
1984 struct net *net = sock_net(skb->sk);
1985 struct xfrm_policy *xp;
1986 struct xfrm_user_tmpl *ut;
1987 int i;
1988 struct nlattr *rt = attrs[XFRMA_TMPL];
1989 struct xfrm_mark mark;
1990
1991 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1992 struct xfrm_state *x = xfrm_state_alloc(net);
1993 int err = -ENOMEM;
1994
1995 if (!x)
1996 goto nomem;
1997
1998 xfrm_mark_get(attrs, &mark);
1999
2000 err = verify_newpolicy_info(&ua->policy);
2001 if (err)
2002 goto bad_policy;
2003
2004 /* build an XP */
2005 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2006 if (!xp)
2007 goto free_state;
2008
2009 memcpy(&x->id, &ua->id, sizeof(ua->id));
2010 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2011 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2012 xp->mark.m = x->mark.m = mark.m;
2013 xp->mark.v = x->mark.v = mark.v;
2014 ut = nla_data(rt);
2015 /* extract the templates and for each call km_key */
2016 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2017 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2018 memcpy(&x->id, &t->id, sizeof(x->id));
2019 x->props.mode = t->mode;
2020 x->props.reqid = t->reqid;
2021 x->props.family = ut->family;
2022 t->aalgos = ua->aalgos;
2023 t->ealgos = ua->ealgos;
2024 t->calgos = ua->calgos;
2025 err = km_query(x, t, xp);
2026
2027 }
2028
2029 kfree(x);
2030 kfree(xp);
2031
2032 return 0;
2033
2034 bad_policy:
2035 WARN(1, "BAD policy passed\n");
2036 free_state:
2037 kfree(x);
2038 nomem:
2039 return err;
2040 }
2041
2042 #ifdef CONFIG_XFRM_MIGRATE
2043 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2044 struct xfrm_kmaddress *k,
2045 struct nlattr **attrs, int *num)
2046 {
2047 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2048 struct xfrm_user_migrate *um;
2049 int i, num_migrate;
2050
2051 if (k != NULL) {
2052 struct xfrm_user_kmaddress *uk;
2053
2054 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2055 memcpy(&k->local, &uk->local, sizeof(k->local));
2056 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2057 k->family = uk->family;
2058 k->reserved = uk->reserved;
2059 }
2060
2061 um = nla_data(rt);
2062 num_migrate = nla_len(rt) / sizeof(*um);
2063
2064 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2065 return -EINVAL;
2066
2067 for (i = 0; i < num_migrate; i++, um++, ma++) {
2068 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2069 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2070 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2071 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2072
2073 ma->proto = um->proto;
2074 ma->mode = um->mode;
2075 ma->reqid = um->reqid;
2076
2077 ma->old_family = um->old_family;
2078 ma->new_family = um->new_family;
2079 }
2080
2081 *num = i;
2082 return 0;
2083 }
2084
2085 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2086 struct nlattr **attrs)
2087 {
2088 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2089 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2090 struct xfrm_kmaddress km, *kmp;
2091 u8 type;
2092 int err;
2093 int n = 0;
2094
2095 if (attrs[XFRMA_MIGRATE] == NULL)
2096 return -EINVAL;
2097
2098 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2099
2100 err = copy_from_user_policy_type(&type, attrs);
2101 if (err)
2102 return err;
2103
2104 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2105 if (err)
2106 return err;
2107
2108 if (!n)
2109 return 0;
2110
2111 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2112
2113 return 0;
2114 }
2115 #else
2116 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2117 struct nlattr **attrs)
2118 {
2119 return -ENOPROTOOPT;
2120 }
2121 #endif
2122
2123 #ifdef CONFIG_XFRM_MIGRATE
2124 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2125 {
2126 struct xfrm_user_migrate um;
2127
2128 memset(&um, 0, sizeof(um));
2129 um.proto = m->proto;
2130 um.mode = m->mode;
2131 um.reqid = m->reqid;
2132 um.old_family = m->old_family;
2133 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2134 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2135 um.new_family = m->new_family;
2136 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2137 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2138
2139 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2140 }
2141
2142 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2143 {
2144 struct xfrm_user_kmaddress uk;
2145
2146 memset(&uk, 0, sizeof(uk));
2147 uk.family = k->family;
2148 uk.reserved = k->reserved;
2149 memcpy(&uk.local, &k->local, sizeof(uk.local));
2150 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2151
2152 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2153 }
2154
2155 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2156 {
2157 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2158 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2159 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2160 + userpolicy_type_attrsize();
2161 }
2162
2163 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2164 int num_migrate, const struct xfrm_kmaddress *k,
2165 const struct xfrm_selector *sel, u8 dir, u8 type)
2166 {
2167 const struct xfrm_migrate *mp;
2168 struct xfrm_userpolicy_id *pol_id;
2169 struct nlmsghdr *nlh;
2170 int i, err;
2171
2172 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2173 if (nlh == NULL)
2174 return -EMSGSIZE;
2175
2176 pol_id = nlmsg_data(nlh);
2177 /* copy data from selector, dir, and type to the pol_id */
2178 memset(pol_id, 0, sizeof(*pol_id));
2179 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2180 pol_id->dir = dir;
2181
2182 if (k != NULL) {
2183 err = copy_to_user_kmaddress(k, skb);
2184 if (err)
2185 goto out_cancel;
2186 }
2187 err = copy_to_user_policy_type(type, skb);
2188 if (err)
2189 goto out_cancel;
2190 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2191 err = copy_to_user_migrate(mp, skb);
2192 if (err)
2193 goto out_cancel;
2194 }
2195
2196 return nlmsg_end(skb, nlh);
2197
2198 out_cancel:
2199 nlmsg_cancel(skb, nlh);
2200 return err;
2201 }
2202
2203 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2204 const struct xfrm_migrate *m, int num_migrate,
2205 const struct xfrm_kmaddress *k)
2206 {
2207 struct net *net = &init_net;
2208 struct sk_buff *skb;
2209
2210 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2211 if (skb == NULL)
2212 return -ENOMEM;
2213
2214 /* build migrate */
2215 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2216 BUG();
2217
2218 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2219 }
2220 #else
2221 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2222 const struct xfrm_migrate *m, int num_migrate,
2223 const struct xfrm_kmaddress *k)
2224 {
2225 return -ENOPROTOOPT;
2226 }
2227 #endif
2228
2229 #define XMSGSIZE(type) sizeof(struct type)
2230
2231 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2232 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2233 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2234 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2235 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2236 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2237 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2238 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2239 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2240 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2241 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2242 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2243 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2244 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2245 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2246 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2247 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2248 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2249 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2250 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2251 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2252 };
2253
2254 #undef XMSGSIZE
2255
2256 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2257 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2258 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2259 [XFRMA_LASTUSED] = { .type = NLA_U64},
2260 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2261 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2262 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2263 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2264 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2265 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2266 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2267 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2268 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2269 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2270 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2271 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2272 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2273 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2274 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2275 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2276 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2277 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2278 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2279 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2280 };
2281
2282 static struct xfrm_link {
2283 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2284 int (*dump)(struct sk_buff *, struct netlink_callback *);
2285 int (*done)(struct netlink_callback *);
2286 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2287 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2288 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2289 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2290 .dump = xfrm_dump_sa,
2291 .done = xfrm_dump_sa_done },
2292 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2293 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2294 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2295 .dump = xfrm_dump_policy,
2296 .done = xfrm_dump_policy_done },
2297 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2298 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2299 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2300 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2301 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2302 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2303 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2304 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2305 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2306 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2307 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2308 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2309 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2310 };
2311
2312 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2313 {
2314 struct net *net = sock_net(skb->sk);
2315 struct nlattr *attrs[XFRMA_MAX+1];
2316 struct xfrm_link *link;
2317 int type, err;
2318
2319 type = nlh->nlmsg_type;
2320 if (type > XFRM_MSG_MAX)
2321 return -EINVAL;
2322
2323 type -= XFRM_MSG_BASE;
2324 link = &xfrm_dispatch[type];
2325
2326 /* All operations require privileges, even GET */
2327 if (!capable(CAP_NET_ADMIN))
2328 return -EPERM;
2329
2330 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2331 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2332 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2333 if (link->dump == NULL)
2334 return -EINVAL;
2335
2336 {
2337 struct netlink_dump_control c = {
2338 .dump = link->dump,
2339 .done = link->done,
2340 };
2341 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2342 }
2343 }
2344
2345 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2346 xfrma_policy);
2347 if (err < 0)
2348 return err;
2349
2350 if (link->doit == NULL)
2351 return -EINVAL;
2352
2353 return link->doit(skb, nlh, attrs);
2354 }
2355
2356 static void xfrm_netlink_rcv(struct sk_buff *skb)
2357 {
2358 mutex_lock(&xfrm_cfg_mutex);
2359 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2360 mutex_unlock(&xfrm_cfg_mutex);
2361 }
2362
2363 static inline size_t xfrm_expire_msgsize(void)
2364 {
2365 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2366 + nla_total_size(sizeof(struct xfrm_mark));
2367 }
2368
2369 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2370 {
2371 struct xfrm_user_expire *ue;
2372 struct nlmsghdr *nlh;
2373 int err;
2374
2375 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2376 if (nlh == NULL)
2377 return -EMSGSIZE;
2378
2379 ue = nlmsg_data(nlh);
2380 copy_to_user_state(x, &ue->state);
2381 ue->hard = (c->data.hard != 0) ? 1 : 0;
2382
2383 err = xfrm_mark_put(skb, &x->mark);
2384 if (err)
2385 return err;
2386
2387 return nlmsg_end(skb, nlh);
2388 }
2389
2390 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2391 {
2392 struct net *net = xs_net(x);
2393 struct sk_buff *skb;
2394
2395 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2396 if (skb == NULL)
2397 return -ENOMEM;
2398
2399 if (build_expire(skb, x, c) < 0) {
2400 kfree_skb(skb);
2401 return -EMSGSIZE;
2402 }
2403
2404 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2405 }
2406
2407 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2408 {
2409 struct net *net = xs_net(x);
2410 struct sk_buff *skb;
2411
2412 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2413 if (skb == NULL)
2414 return -ENOMEM;
2415
2416 if (build_aevent(skb, x, c) < 0)
2417 BUG();
2418
2419 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2420 }
2421
2422 static int xfrm_notify_sa_flush(const struct km_event *c)
2423 {
2424 struct net *net = c->net;
2425 struct xfrm_usersa_flush *p;
2426 struct nlmsghdr *nlh;
2427 struct sk_buff *skb;
2428 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2429
2430 skb = nlmsg_new(len, GFP_ATOMIC);
2431 if (skb == NULL)
2432 return -ENOMEM;
2433
2434 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2435 if (nlh == NULL) {
2436 kfree_skb(skb);
2437 return -EMSGSIZE;
2438 }
2439
2440 p = nlmsg_data(nlh);
2441 p->proto = c->data.proto;
2442
2443 nlmsg_end(skb, nlh);
2444
2445 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2446 }
2447
2448 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2449 {
2450 size_t l = 0;
2451 if (x->aead)
2452 l += nla_total_size(aead_len(x->aead));
2453 if (x->aalg) {
2454 l += nla_total_size(sizeof(struct xfrm_algo) +
2455 (x->aalg->alg_key_len + 7) / 8);
2456 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2457 }
2458 if (x->ealg)
2459 l += nla_total_size(xfrm_alg_len(x->ealg));
2460 if (x->calg)
2461 l += nla_total_size(sizeof(*x->calg));
2462 if (x->encap)
2463 l += nla_total_size(sizeof(*x->encap));
2464 if (x->tfcpad)
2465 l += nla_total_size(sizeof(x->tfcpad));
2466 if (x->replay_esn)
2467 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2468 if (x->security)
2469 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2470 x->security->ctx_len);
2471 if (x->coaddr)
2472 l += nla_total_size(sizeof(*x->coaddr));
2473
2474 /* Must count x->lastused as it may become non-zero behind our back. */
2475 l += nla_total_size(sizeof(u64));
2476
2477 return l;
2478 }
2479
2480 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2481 {
2482 struct net *net = xs_net(x);
2483 struct xfrm_usersa_info *p;
2484 struct xfrm_usersa_id *id;
2485 struct nlmsghdr *nlh;
2486 struct sk_buff *skb;
2487 int len = xfrm_sa_len(x);
2488 int headlen, err;
2489
2490 headlen = sizeof(*p);
2491 if (c->event == XFRM_MSG_DELSA) {
2492 len += nla_total_size(headlen);
2493 headlen = sizeof(*id);
2494 len += nla_total_size(sizeof(struct xfrm_mark));
2495 }
2496 len += NLMSG_ALIGN(headlen);
2497
2498 skb = nlmsg_new(len, GFP_ATOMIC);
2499 if (skb == NULL)
2500 return -ENOMEM;
2501
2502 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2503 err = -EMSGSIZE;
2504 if (nlh == NULL)
2505 goto out_free_skb;
2506
2507 p = nlmsg_data(nlh);
2508 if (c->event == XFRM_MSG_DELSA) {
2509 struct nlattr *attr;
2510
2511 id = nlmsg_data(nlh);
2512 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2513 id->spi = x->id.spi;
2514 id->family = x->props.family;
2515 id->proto = x->id.proto;
2516
2517 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2518 err = -EMSGSIZE;
2519 if (attr == NULL)
2520 goto out_free_skb;
2521
2522 p = nla_data(attr);
2523 }
2524 err = copy_to_user_state_extra(x, p, skb);
2525 if (err)
2526 goto out_free_skb;
2527
2528 nlmsg_end(skb, nlh);
2529
2530 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2531
2532 out_free_skb:
2533 kfree_skb(skb);
2534 return err;
2535 }
2536
2537 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2538 {
2539
2540 switch (c->event) {
2541 case XFRM_MSG_EXPIRE:
2542 return xfrm_exp_state_notify(x, c);
2543 case XFRM_MSG_NEWAE:
2544 return xfrm_aevent_state_notify(x, c);
2545 case XFRM_MSG_DELSA:
2546 case XFRM_MSG_UPDSA:
2547 case XFRM_MSG_NEWSA:
2548 return xfrm_notify_sa(x, c);
2549 case XFRM_MSG_FLUSHSA:
2550 return xfrm_notify_sa_flush(c);
2551 default:
2552 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2553 c->event);
2554 break;
2555 }
2556
2557 return 0;
2558
2559 }
2560
2561 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2562 struct xfrm_policy *xp)
2563 {
2564 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2565 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2566 + nla_total_size(sizeof(struct xfrm_mark))
2567 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2568 + userpolicy_type_attrsize();
2569 }
2570
2571 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2572 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2573 int dir)
2574 {
2575 __u32 seq = xfrm_get_acqseq();
2576 struct xfrm_user_acquire *ua;
2577 struct nlmsghdr *nlh;
2578 int err;
2579
2580 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2581 if (nlh == NULL)
2582 return -EMSGSIZE;
2583
2584 ua = nlmsg_data(nlh);
2585 memcpy(&ua->id, &x->id, sizeof(ua->id));
2586 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2587 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2588 copy_to_user_policy(xp, &ua->policy, dir);
2589 ua->aalgos = xt->aalgos;
2590 ua->ealgos = xt->ealgos;
2591 ua->calgos = xt->calgos;
2592 ua->seq = x->km.seq = seq;
2593
2594 err = copy_to_user_tmpl(xp, skb);
2595 if (!err)
2596 err = copy_to_user_state_sec_ctx(x, skb);
2597 if (!err)
2598 err = copy_to_user_policy_type(xp->type, skb);
2599 if (!err)
2600 err = xfrm_mark_put(skb, &xp->mark);
2601 if (err) {
2602 nlmsg_cancel(skb, nlh);
2603 return err;
2604 }
2605
2606 return nlmsg_end(skb, nlh);
2607 }
2608
2609 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2610 struct xfrm_policy *xp, int dir)
2611 {
2612 struct net *net = xs_net(x);
2613 struct sk_buff *skb;
2614
2615 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2616 if (skb == NULL)
2617 return -ENOMEM;
2618
2619 if (build_acquire(skb, x, xt, xp, dir) < 0)
2620 BUG();
2621
2622 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2623 }
2624
2625 /* User gives us xfrm_user_policy_info followed by an array of 0
2626 * or more templates.
2627 */
2628 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2629 u8 *data, int len, int *dir)
2630 {
2631 struct net *net = sock_net(sk);
2632 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2633 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2634 struct xfrm_policy *xp;
2635 int nr;
2636
2637 switch (sk->sk_family) {
2638 case AF_INET:
2639 if (opt != IP_XFRM_POLICY) {
2640 *dir = -EOPNOTSUPP;
2641 return NULL;
2642 }
2643 break;
2644 #if IS_ENABLED(CONFIG_IPV6)
2645 case AF_INET6:
2646 if (opt != IPV6_XFRM_POLICY) {
2647 *dir = -EOPNOTSUPP;
2648 return NULL;
2649 }
2650 break;
2651 #endif
2652 default:
2653 *dir = -EINVAL;
2654 return NULL;
2655 }
2656
2657 *dir = -EINVAL;
2658
2659 if (len < sizeof(*p) ||
2660 verify_newpolicy_info(p))
2661 return NULL;
2662
2663 nr = ((len - sizeof(*p)) / sizeof(*ut));
2664 if (validate_tmpl(nr, ut, p->sel.family))
2665 return NULL;
2666
2667 if (p->dir > XFRM_POLICY_OUT)
2668 return NULL;
2669
2670 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2671 if (xp == NULL) {
2672 *dir = -ENOBUFS;
2673 return NULL;
2674 }
2675
2676 copy_from_user_policy(xp, p);
2677 xp->type = XFRM_POLICY_TYPE_MAIN;
2678 copy_templates(xp, ut, nr);
2679
2680 *dir = p->dir;
2681
2682 return xp;
2683 }
2684
2685 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2686 {
2687 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2688 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2689 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2690 + nla_total_size(sizeof(struct xfrm_mark))
2691 + userpolicy_type_attrsize();
2692 }
2693
2694 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2695 int dir, const struct km_event *c)
2696 {
2697 struct xfrm_user_polexpire *upe;
2698 int hard = c->data.hard;
2699 struct nlmsghdr *nlh;
2700 int err;
2701
2702 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2703 if (nlh == NULL)
2704 return -EMSGSIZE;
2705
2706 upe = nlmsg_data(nlh);
2707 copy_to_user_policy(xp, &upe->pol, dir);
2708 err = copy_to_user_tmpl(xp, skb);
2709 if (!err)
2710 err = copy_to_user_sec_ctx(xp, skb);
2711 if (!err)
2712 err = copy_to_user_policy_type(xp->type, skb);
2713 if (!err)
2714 err = xfrm_mark_put(skb, &xp->mark);
2715 if (err) {
2716 nlmsg_cancel(skb, nlh);
2717 return err;
2718 }
2719 upe->hard = !!hard;
2720
2721 return nlmsg_end(skb, nlh);
2722 }
2723
2724 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2725 {
2726 struct net *net = xp_net(xp);
2727 struct sk_buff *skb;
2728
2729 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2730 if (skb == NULL)
2731 return -ENOMEM;
2732
2733 if (build_polexpire(skb, xp, dir, c) < 0)
2734 BUG();
2735
2736 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2737 }
2738
2739 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2740 {
2741 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2742 struct net *net = xp_net(xp);
2743 struct xfrm_userpolicy_info *p;
2744 struct xfrm_userpolicy_id *id;
2745 struct nlmsghdr *nlh;
2746 struct sk_buff *skb;
2747 int headlen, err;
2748
2749 headlen = sizeof(*p);
2750 if (c->event == XFRM_MSG_DELPOLICY) {
2751 len += nla_total_size(headlen);
2752 headlen = sizeof(*id);
2753 }
2754 len += userpolicy_type_attrsize();
2755 len += nla_total_size(sizeof(struct xfrm_mark));
2756 len += NLMSG_ALIGN(headlen);
2757
2758 skb = nlmsg_new(len, GFP_ATOMIC);
2759 if (skb == NULL)
2760 return -ENOMEM;
2761
2762 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2763 err = -EMSGSIZE;
2764 if (nlh == NULL)
2765 goto out_free_skb;
2766
2767 p = nlmsg_data(nlh);
2768 if (c->event == XFRM_MSG_DELPOLICY) {
2769 struct nlattr *attr;
2770
2771 id = nlmsg_data(nlh);
2772 memset(id, 0, sizeof(*id));
2773 id->dir = dir;
2774 if (c->data.byid)
2775 id->index = xp->index;
2776 else
2777 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2778
2779 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2780 err = -EMSGSIZE;
2781 if (attr == NULL)
2782 goto out_free_skb;
2783
2784 p = nla_data(attr);
2785 }
2786
2787 copy_to_user_policy(xp, p, dir);
2788 err = copy_to_user_tmpl(xp, skb);
2789 if (!err)
2790 err = copy_to_user_policy_type(xp->type, skb);
2791 if (!err)
2792 err = xfrm_mark_put(skb, &xp->mark);
2793 if (err)
2794 goto out_free_skb;
2795
2796 nlmsg_end(skb, nlh);
2797
2798 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2799
2800 out_free_skb:
2801 kfree_skb(skb);
2802 return err;
2803 }
2804
2805 static int xfrm_notify_policy_flush(const struct km_event *c)
2806 {
2807 struct net *net = c->net;
2808 struct nlmsghdr *nlh;
2809 struct sk_buff *skb;
2810 int err;
2811
2812 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2813 if (skb == NULL)
2814 return -ENOMEM;
2815
2816 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2817 err = -EMSGSIZE;
2818 if (nlh == NULL)
2819 goto out_free_skb;
2820 err = copy_to_user_policy_type(c->data.type, skb);
2821 if (err)
2822 goto out_free_skb;
2823
2824 nlmsg_end(skb, nlh);
2825
2826 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2827
2828 out_free_skb:
2829 kfree_skb(skb);
2830 return err;
2831 }
2832
2833 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2834 {
2835
2836 switch (c->event) {
2837 case XFRM_MSG_NEWPOLICY:
2838 case XFRM_MSG_UPDPOLICY:
2839 case XFRM_MSG_DELPOLICY:
2840 return xfrm_notify_policy(xp, dir, c);
2841 case XFRM_MSG_FLUSHPOLICY:
2842 return xfrm_notify_policy_flush(c);
2843 case XFRM_MSG_POLEXPIRE:
2844 return xfrm_exp_policy_notify(xp, dir, c);
2845 default:
2846 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2847 c->event);
2848 }
2849
2850 return 0;
2851
2852 }
2853
2854 static inline size_t xfrm_report_msgsize(void)
2855 {
2856 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2857 }
2858
2859 static int build_report(struct sk_buff *skb, u8 proto,
2860 struct xfrm_selector *sel, xfrm_address_t *addr)
2861 {
2862 struct xfrm_user_report *ur;
2863 struct nlmsghdr *nlh;
2864
2865 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2866 if (nlh == NULL)
2867 return -EMSGSIZE;
2868
2869 ur = nlmsg_data(nlh);
2870 ur->proto = proto;
2871 memcpy(&ur->sel, sel, sizeof(ur->sel));
2872
2873 if (addr) {
2874 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2875 if (err) {
2876 nlmsg_cancel(skb, nlh);
2877 return err;
2878 }
2879 }
2880 return nlmsg_end(skb, nlh);
2881 }
2882
2883 static int xfrm_send_report(struct net *net, u8 proto,
2884 struct xfrm_selector *sel, xfrm_address_t *addr)
2885 {
2886 struct sk_buff *skb;
2887
2888 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2889 if (skb == NULL)
2890 return -ENOMEM;
2891
2892 if (build_report(skb, proto, sel, addr) < 0)
2893 BUG();
2894
2895 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2896 }
2897
2898 static inline size_t xfrm_mapping_msgsize(void)
2899 {
2900 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2901 }
2902
2903 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2904 xfrm_address_t *new_saddr, __be16 new_sport)
2905 {
2906 struct xfrm_user_mapping *um;
2907 struct nlmsghdr *nlh;
2908
2909 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2910 if (nlh == NULL)
2911 return -EMSGSIZE;
2912
2913 um = nlmsg_data(nlh);
2914
2915 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2916 um->id.spi = x->id.spi;
2917 um->id.family = x->props.family;
2918 um->id.proto = x->id.proto;
2919 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2920 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2921 um->new_sport = new_sport;
2922 um->old_sport = x->encap->encap_sport;
2923 um->reqid = x->props.reqid;
2924
2925 return nlmsg_end(skb, nlh);
2926 }
2927
2928 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2929 __be16 sport)
2930 {
2931 struct net *net = xs_net(x);
2932 struct sk_buff *skb;
2933
2934 if (x->id.proto != IPPROTO_ESP)
2935 return -EINVAL;
2936
2937 if (!x->encap)
2938 return -EINVAL;
2939
2940 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2941 if (skb == NULL)
2942 return -ENOMEM;
2943
2944 if (build_mapping(skb, x, ipaddr, sport) < 0)
2945 BUG();
2946
2947 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2948 }
2949
2950 static struct xfrm_mgr netlink_mgr = {
2951 .id = "netlink",
2952 .notify = xfrm_send_state_notify,
2953 .acquire = xfrm_send_acquire,
2954 .compile_policy = xfrm_compile_policy,
2955 .notify_policy = xfrm_send_policy_notify,
2956 .report = xfrm_send_report,
2957 .migrate = xfrm_send_migrate,
2958 .new_mapping = xfrm_send_mapping,
2959 };
2960
2961 static int __net_init xfrm_user_net_init(struct net *net)
2962 {
2963 struct sock *nlsk;
2964 struct netlink_kernel_cfg cfg = {
2965 .groups = XFRMNLGRP_MAX,
2966 .input = xfrm_netlink_rcv,
2967 };
2968
2969 nlsk = netlink_kernel_create(net, NETLINK_XFRM, THIS_MODULE, &cfg);
2970 if (nlsk == NULL)
2971 return -ENOMEM;
2972 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2973 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2974 return 0;
2975 }
2976
2977 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2978 {
2979 struct net *net;
2980 list_for_each_entry(net, net_exit_list, exit_list)
2981 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
2982 synchronize_net();
2983 list_for_each_entry(net, net_exit_list, exit_list)
2984 netlink_kernel_release(net->xfrm.nlsk_stash);
2985 }
2986
2987 static struct pernet_operations xfrm_user_net_ops = {
2988 .init = xfrm_user_net_init,
2989 .exit_batch = xfrm_user_net_exit,
2990 };
2991
2992 static int __init xfrm_user_init(void)
2993 {
2994 int rv;
2995
2996 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2997
2998 rv = register_pernet_subsys(&xfrm_user_net_ops);
2999 if (rv < 0)
3000 return rv;
3001 rv = xfrm_register_km(&netlink_mgr);
3002 if (rv < 0)
3003 unregister_pernet_subsys(&xfrm_user_net_ops);
3004 return rv;
3005 }
3006
3007 static void __exit xfrm_user_exit(void)
3008 {
3009 xfrm_unregister_km(&netlink_mgr);
3010 unregister_pernet_subsys(&xfrm_user_net_ops);
3011 }
3012
3013 module_init(xfrm_user_init);
3014 module_exit(xfrm_user_exit);
3015 MODULE_LICENSE("GPL");
3016 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3017
Linux kernel - Deliverables
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