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Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
[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 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 (ntohl(p->id.spi) >= 0x10000))
186
187 goto out;
188 break;
189
190 case IPPROTO_ESP:
191 if (attrs[XFRMA_ALG_COMP])
192 goto out;
193 if (!attrs[XFRMA_ALG_AUTH] &&
194 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
195 !attrs[XFRMA_ALG_CRYPT] &&
196 !attrs[XFRMA_ALG_AEAD])
197 goto out;
198 if ((attrs[XFRMA_ALG_AUTH] ||
199 attrs[XFRMA_ALG_AUTH_TRUNC] ||
200 attrs[XFRMA_ALG_CRYPT]) &&
201 attrs[XFRMA_ALG_AEAD])
202 goto out;
203 if (attrs[XFRMA_TFCPAD] &&
204 p->mode != XFRM_MODE_TUNNEL)
205 goto out;
206 break;
207
208 case IPPROTO_COMP:
209 if (!attrs[XFRMA_ALG_COMP] ||
210 attrs[XFRMA_ALG_AEAD] ||
211 attrs[XFRMA_ALG_AUTH] ||
212 attrs[XFRMA_ALG_AUTH_TRUNC] ||
213 attrs[XFRMA_ALG_CRYPT] ||
214 attrs[XFRMA_TFCPAD])
215 goto out;
216 break;
217
218 #if IS_ENABLED(CONFIG_IPV6)
219 case IPPROTO_DSTOPTS:
220 case IPPROTO_ROUTING:
221 if (attrs[XFRMA_ALG_COMP] ||
222 attrs[XFRMA_ALG_AUTH] ||
223 attrs[XFRMA_ALG_AUTH_TRUNC] ||
224 attrs[XFRMA_ALG_AEAD] ||
225 attrs[XFRMA_ALG_CRYPT] ||
226 attrs[XFRMA_ENCAP] ||
227 attrs[XFRMA_SEC_CTX] ||
228 attrs[XFRMA_TFCPAD] ||
229 !attrs[XFRMA_COADDR])
230 goto out;
231 break;
232 #endif
233
234 default:
235 goto out;
236 }
237
238 if ((err = verify_aead(attrs)))
239 goto out;
240 if ((err = verify_auth_trunc(attrs)))
241 goto out;
242 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
243 goto out;
244 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
245 goto out;
246 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
247 goto out;
248 if ((err = verify_sec_ctx_len(attrs)))
249 goto out;
250 if ((err = verify_replay(p, attrs)))
251 goto out;
252
253 err = -EINVAL;
254 switch (p->mode) {
255 case XFRM_MODE_TRANSPORT:
256 case XFRM_MODE_TUNNEL:
257 case XFRM_MODE_ROUTEOPTIMIZATION:
258 case XFRM_MODE_BEET:
259 break;
260
261 default:
262 goto out;
263 }
264
265 err = 0;
266
267 out:
268 return err;
269 }
270
271 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
272 struct xfrm_algo_desc *(*get_byname)(const char *, int),
273 struct nlattr *rta)
274 {
275 struct xfrm_algo *p, *ualg;
276 struct xfrm_algo_desc *algo;
277
278 if (!rta)
279 return 0;
280
281 ualg = nla_data(rta);
282
283 algo = get_byname(ualg->alg_name, 1);
284 if (!algo)
285 return -ENOSYS;
286 *props = algo->desc.sadb_alg_id;
287
288 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
289 if (!p)
290 return -ENOMEM;
291
292 strcpy(p->alg_name, algo->name);
293 *algpp = p;
294 return 0;
295 }
296
297 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
298 struct nlattr *rta)
299 {
300 struct xfrm_algo *ualg;
301 struct xfrm_algo_auth *p;
302 struct xfrm_algo_desc *algo;
303
304 if (!rta)
305 return 0;
306
307 ualg = nla_data(rta);
308
309 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
310 if (!algo)
311 return -ENOSYS;
312 *props = algo->desc.sadb_alg_id;
313
314 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
315 if (!p)
316 return -ENOMEM;
317
318 strcpy(p->alg_name, algo->name);
319 p->alg_key_len = ualg->alg_key_len;
320 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
321 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
322
323 *algpp = p;
324 return 0;
325 }
326
327 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
328 struct nlattr *rta)
329 {
330 struct xfrm_algo_auth *p, *ualg;
331 struct xfrm_algo_desc *algo;
332
333 if (!rta)
334 return 0;
335
336 ualg = nla_data(rta);
337
338 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
339 if (!algo)
340 return -ENOSYS;
341 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
342 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
343 return -EINVAL;
344 *props = algo->desc.sadb_alg_id;
345
346 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
347 if (!p)
348 return -ENOMEM;
349
350 strcpy(p->alg_name, algo->name);
351 if (!p->alg_trunc_len)
352 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
353
354 *algpp = p;
355 return 0;
356 }
357
358 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
359 struct nlattr *rta)
360 {
361 struct xfrm_algo_aead *p, *ualg;
362 struct xfrm_algo_desc *algo;
363
364 if (!rta)
365 return 0;
366
367 ualg = nla_data(rta);
368
369 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
370 if (!algo)
371 return -ENOSYS;
372 *props = algo->desc.sadb_alg_id;
373
374 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
375 if (!p)
376 return -ENOMEM;
377
378 strcpy(p->alg_name, algo->name);
379 *algpp = p;
380 return 0;
381 }
382
383 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
384 struct nlattr *rp)
385 {
386 struct xfrm_replay_state_esn *up;
387 int ulen;
388
389 if (!replay_esn || !rp)
390 return 0;
391
392 up = nla_data(rp);
393 ulen = xfrm_replay_state_esn_len(up);
394
395 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
396 return -EINVAL;
397
398 return 0;
399 }
400
401 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
402 struct xfrm_replay_state_esn **preplay_esn,
403 struct nlattr *rta)
404 {
405 struct xfrm_replay_state_esn *p, *pp, *up;
406 int klen, ulen;
407
408 if (!rta)
409 return 0;
410
411 up = nla_data(rta);
412 klen = xfrm_replay_state_esn_len(up);
413 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
414
415 p = kzalloc(klen, GFP_KERNEL);
416 if (!p)
417 return -ENOMEM;
418
419 pp = kzalloc(klen, GFP_KERNEL);
420 if (!pp) {
421 kfree(p);
422 return -ENOMEM;
423 }
424
425 memcpy(p, up, ulen);
426 memcpy(pp, up, ulen);
427
428 *replay_esn = p;
429 *preplay_esn = pp;
430
431 return 0;
432 }
433
434 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
435 {
436 int len = 0;
437
438 if (xfrm_ctx) {
439 len += sizeof(struct xfrm_user_sec_ctx);
440 len += xfrm_ctx->ctx_len;
441 }
442 return len;
443 }
444
445 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
446 {
447 memcpy(&x->id, &p->id, sizeof(x->id));
448 memcpy(&x->sel, &p->sel, sizeof(x->sel));
449 memcpy(&x->lft, &p->lft, sizeof(x->lft));
450 x->props.mode = p->mode;
451 x->props.replay_window = min_t(unsigned int, p->replay_window,
452 sizeof(x->replay.bitmap) * 8);
453 x->props.reqid = p->reqid;
454 x->props.family = p->family;
455 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
456 x->props.flags = p->flags;
457
458 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
459 x->sel.family = p->family;
460 }
461
462 /*
463 * someday when pfkey also has support, we could have the code
464 * somehow made shareable and move it to xfrm_state.c - JHS
465 *
466 */
467 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
468 int update_esn)
469 {
470 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
471 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
472 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
473 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
474 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
475
476 if (re) {
477 struct xfrm_replay_state_esn *replay_esn;
478 replay_esn = nla_data(re);
479 memcpy(x->replay_esn, replay_esn,
480 xfrm_replay_state_esn_len(replay_esn));
481 memcpy(x->preplay_esn, replay_esn,
482 xfrm_replay_state_esn_len(replay_esn));
483 }
484
485 if (rp) {
486 struct xfrm_replay_state *replay;
487 replay = nla_data(rp);
488 memcpy(&x->replay, replay, sizeof(*replay));
489 memcpy(&x->preplay, replay, sizeof(*replay));
490 }
491
492 if (lt) {
493 struct xfrm_lifetime_cur *ltime;
494 ltime = nla_data(lt);
495 x->curlft.bytes = ltime->bytes;
496 x->curlft.packets = ltime->packets;
497 x->curlft.add_time = ltime->add_time;
498 x->curlft.use_time = ltime->use_time;
499 }
500
501 if (et)
502 x->replay_maxage = nla_get_u32(et);
503
504 if (rt)
505 x->replay_maxdiff = nla_get_u32(rt);
506 }
507
508 static struct xfrm_state *xfrm_state_construct(struct net *net,
509 struct xfrm_usersa_info *p,
510 struct nlattr **attrs,
511 int *errp)
512 {
513 struct xfrm_state *x = xfrm_state_alloc(net);
514 int err = -ENOMEM;
515
516 if (!x)
517 goto error_no_put;
518
519 copy_from_user_state(x, p);
520
521 if (attrs[XFRMA_SA_EXTRA_FLAGS])
522 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
523
524 if ((err = attach_aead(&x->aead, &x->props.ealgo,
525 attrs[XFRMA_ALG_AEAD])))
526 goto error;
527 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
528 attrs[XFRMA_ALG_AUTH_TRUNC])))
529 goto error;
530 if (!x->props.aalgo) {
531 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
532 attrs[XFRMA_ALG_AUTH])))
533 goto error;
534 }
535 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
536 xfrm_ealg_get_byname,
537 attrs[XFRMA_ALG_CRYPT])))
538 goto error;
539 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
540 xfrm_calg_get_byname,
541 attrs[XFRMA_ALG_COMP])))
542 goto error;
543
544 if (attrs[XFRMA_ENCAP]) {
545 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
546 sizeof(*x->encap), GFP_KERNEL);
547 if (x->encap == NULL)
548 goto error;
549 }
550
551 if (attrs[XFRMA_TFCPAD])
552 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
553
554 if (attrs[XFRMA_COADDR]) {
555 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
556 sizeof(*x->coaddr), GFP_KERNEL);
557 if (x->coaddr == NULL)
558 goto error;
559 }
560
561 xfrm_mark_get(attrs, &x->mark);
562
563 err = __xfrm_init_state(x, false);
564 if (err)
565 goto error;
566
567 if (attrs[XFRMA_SEC_CTX] &&
568 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
569 goto error;
570
571 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
572 attrs[XFRMA_REPLAY_ESN_VAL])))
573 goto error;
574
575 x->km.seq = p->seq;
576 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
577 /* sysctl_xfrm_aevent_etime is in 100ms units */
578 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
579
580 if ((err = xfrm_init_replay(x)))
581 goto error;
582
583 /* override default values from above */
584 xfrm_update_ae_params(x, attrs, 0);
585
586 return x;
587
588 error:
589 x->km.state = XFRM_STATE_DEAD;
590 xfrm_state_put(x);
591 error_no_put:
592 *errp = err;
593 return NULL;
594 }
595
596 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
597 struct nlattr **attrs)
598 {
599 struct net *net = sock_net(skb->sk);
600 struct xfrm_usersa_info *p = nlmsg_data(nlh);
601 struct xfrm_state *x;
602 int err;
603 struct km_event c;
604 kuid_t loginuid = audit_get_loginuid(current);
605 unsigned int sessionid = audit_get_sessionid(current);
606 u32 sid;
607
608 err = verify_newsa_info(p, attrs);
609 if (err)
610 return err;
611
612 x = xfrm_state_construct(net, p, attrs, &err);
613 if (!x)
614 return err;
615
616 xfrm_state_hold(x);
617 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
618 err = xfrm_state_add(x);
619 else
620 err = xfrm_state_update(x);
621
622 security_task_getsecid(current, &sid);
623 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
624
625 if (err < 0) {
626 x->km.state = XFRM_STATE_DEAD;
627 __xfrm_state_put(x);
628 goto out;
629 }
630
631 c.seq = nlh->nlmsg_seq;
632 c.portid = nlh->nlmsg_pid;
633 c.event = nlh->nlmsg_type;
634
635 km_state_notify(x, &c);
636 out:
637 xfrm_state_put(x);
638 return err;
639 }
640
641 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
642 struct xfrm_usersa_id *p,
643 struct nlattr **attrs,
644 int *errp)
645 {
646 struct xfrm_state *x = NULL;
647 struct xfrm_mark m;
648 int err;
649 u32 mark = xfrm_mark_get(attrs, &m);
650
651 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
652 err = -ESRCH;
653 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
654 } else {
655 xfrm_address_t *saddr = NULL;
656
657 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
658 if (!saddr) {
659 err = -EINVAL;
660 goto out;
661 }
662
663 err = -ESRCH;
664 x = xfrm_state_lookup_byaddr(net, mark,
665 &p->daddr, saddr,
666 p->proto, p->family);
667 }
668
669 out:
670 if (!x && errp)
671 *errp = err;
672 return x;
673 }
674
675 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
676 struct nlattr **attrs)
677 {
678 struct net *net = sock_net(skb->sk);
679 struct xfrm_state *x;
680 int err = -ESRCH;
681 struct km_event c;
682 struct xfrm_usersa_id *p = nlmsg_data(nlh);
683 kuid_t loginuid = audit_get_loginuid(current);
684 unsigned int sessionid = audit_get_sessionid(current);
685 u32 sid;
686
687 x = xfrm_user_state_lookup(net, p, attrs, &err);
688 if (x == NULL)
689 return err;
690
691 if ((err = security_xfrm_state_delete(x)) != 0)
692 goto out;
693
694 if (xfrm_state_kern(x)) {
695 err = -EPERM;
696 goto out;
697 }
698
699 err = xfrm_state_delete(x);
700
701 if (err < 0)
702 goto out;
703
704 c.seq = nlh->nlmsg_seq;
705 c.portid = nlh->nlmsg_pid;
706 c.event = nlh->nlmsg_type;
707 km_state_notify(x, &c);
708
709 out:
710 security_task_getsecid(current, &sid);
711 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
712 xfrm_state_put(x);
713 return err;
714 }
715
716 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
717 {
718 memset(p, 0, sizeof(*p));
719 memcpy(&p->id, &x->id, sizeof(p->id));
720 memcpy(&p->sel, &x->sel, sizeof(p->sel));
721 memcpy(&p->lft, &x->lft, sizeof(p->lft));
722 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
723 memcpy(&p->stats, &x->stats, sizeof(p->stats));
724 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
725 p->mode = x->props.mode;
726 p->replay_window = x->props.replay_window;
727 p->reqid = x->props.reqid;
728 p->family = x->props.family;
729 p->flags = x->props.flags;
730 p->seq = x->km.seq;
731 }
732
733 struct xfrm_dump_info {
734 struct sk_buff *in_skb;
735 struct sk_buff *out_skb;
736 u32 nlmsg_seq;
737 u16 nlmsg_flags;
738 };
739
740 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
741 {
742 struct xfrm_user_sec_ctx *uctx;
743 struct nlattr *attr;
744 int ctx_size = sizeof(*uctx) + s->ctx_len;
745
746 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
747 if (attr == NULL)
748 return -EMSGSIZE;
749
750 uctx = nla_data(attr);
751 uctx->exttype = XFRMA_SEC_CTX;
752 uctx->len = ctx_size;
753 uctx->ctx_doi = s->ctx_doi;
754 uctx->ctx_alg = s->ctx_alg;
755 uctx->ctx_len = s->ctx_len;
756 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
757
758 return 0;
759 }
760
761 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
762 {
763 struct xfrm_algo *algo;
764 struct nlattr *nla;
765
766 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
767 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
768 if (!nla)
769 return -EMSGSIZE;
770
771 algo = nla_data(nla);
772 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
773 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
774 algo->alg_key_len = auth->alg_key_len;
775
776 return 0;
777 }
778
779 /* Don't change this without updating xfrm_sa_len! */
780 static int copy_to_user_state_extra(struct xfrm_state *x,
781 struct xfrm_usersa_info *p,
782 struct sk_buff *skb)
783 {
784 int ret = 0;
785
786 copy_to_user_state(x, p);
787
788 if (x->props.extra_flags) {
789 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
790 x->props.extra_flags);
791 if (ret)
792 goto out;
793 }
794
795 if (x->coaddr) {
796 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
797 if (ret)
798 goto out;
799 }
800 if (x->lastused) {
801 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
802 if (ret)
803 goto out;
804 }
805 if (x->aead) {
806 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
807 if (ret)
808 goto out;
809 }
810 if (x->aalg) {
811 ret = copy_to_user_auth(x->aalg, skb);
812 if (!ret)
813 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
814 xfrm_alg_auth_len(x->aalg), x->aalg);
815 if (ret)
816 goto out;
817 }
818 if (x->ealg) {
819 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
820 if (ret)
821 goto out;
822 }
823 if (x->calg) {
824 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
825 if (ret)
826 goto out;
827 }
828 if (x->encap) {
829 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
830 if (ret)
831 goto out;
832 }
833 if (x->tfcpad) {
834 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
835 if (ret)
836 goto out;
837 }
838 ret = xfrm_mark_put(skb, &x->mark);
839 if (ret)
840 goto out;
841 if (x->replay_esn) {
842 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
843 xfrm_replay_state_esn_len(x->replay_esn),
844 x->replay_esn);
845 if (ret)
846 goto out;
847 }
848 if (x->security)
849 ret = copy_sec_ctx(x->security, skb);
850 out:
851 return ret;
852 }
853
854 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
855 {
856 struct xfrm_dump_info *sp = ptr;
857 struct sk_buff *in_skb = sp->in_skb;
858 struct sk_buff *skb = sp->out_skb;
859 struct xfrm_usersa_info *p;
860 struct nlmsghdr *nlh;
861 int err;
862
863 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
864 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
865 if (nlh == NULL)
866 return -EMSGSIZE;
867
868 p = nlmsg_data(nlh);
869
870 err = copy_to_user_state_extra(x, p, skb);
871 if (err) {
872 nlmsg_cancel(skb, nlh);
873 return err;
874 }
875 nlmsg_end(skb, nlh);
876 return 0;
877 }
878
879 static int xfrm_dump_sa_done(struct netlink_callback *cb)
880 {
881 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
882 struct sock *sk = cb->skb->sk;
883 struct net *net = sock_net(sk);
884
885 xfrm_state_walk_done(walk, net);
886 return 0;
887 }
888
889 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
890 {
891 struct net *net = sock_net(skb->sk);
892 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
893 struct xfrm_dump_info info;
894
895 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
896 sizeof(cb->args) - sizeof(cb->args[0]));
897
898 info.in_skb = cb->skb;
899 info.out_skb = skb;
900 info.nlmsg_seq = cb->nlh->nlmsg_seq;
901 info.nlmsg_flags = NLM_F_MULTI;
902
903 if (!cb->args[0]) {
904 cb->args[0] = 1;
905 xfrm_state_walk_init(walk, 0);
906 }
907
908 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
909
910 return skb->len;
911 }
912
913 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
914 struct xfrm_state *x, u32 seq)
915 {
916 struct xfrm_dump_info info;
917 struct sk_buff *skb;
918 int err;
919
920 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
921 if (!skb)
922 return ERR_PTR(-ENOMEM);
923
924 info.in_skb = in_skb;
925 info.out_skb = skb;
926 info.nlmsg_seq = seq;
927 info.nlmsg_flags = 0;
928
929 err = dump_one_state(x, 0, &info);
930 if (err) {
931 kfree_skb(skb);
932 return ERR_PTR(err);
933 }
934
935 return skb;
936 }
937
938 static inline size_t xfrm_spdinfo_msgsize(void)
939 {
940 return NLMSG_ALIGN(4)
941 + nla_total_size(sizeof(struct xfrmu_spdinfo))
942 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
943 }
944
945 static int build_spdinfo(struct sk_buff *skb, struct net *net,
946 u32 portid, u32 seq, u32 flags)
947 {
948 struct xfrmk_spdinfo si;
949 struct xfrmu_spdinfo spc;
950 struct xfrmu_spdhinfo sph;
951 struct nlmsghdr *nlh;
952 int err;
953 u32 *f;
954
955 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
956 if (nlh == NULL) /* shouldn't really happen ... */
957 return -EMSGSIZE;
958
959 f = nlmsg_data(nlh);
960 *f = flags;
961 xfrm_spd_getinfo(net, &si);
962 spc.incnt = si.incnt;
963 spc.outcnt = si.outcnt;
964 spc.fwdcnt = si.fwdcnt;
965 spc.inscnt = si.inscnt;
966 spc.outscnt = si.outscnt;
967 spc.fwdscnt = si.fwdscnt;
968 sph.spdhcnt = si.spdhcnt;
969 sph.spdhmcnt = si.spdhmcnt;
970
971 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
972 if (!err)
973 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
974 if (err) {
975 nlmsg_cancel(skb, nlh);
976 return err;
977 }
978
979 return nlmsg_end(skb, nlh);
980 }
981
982 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
983 struct nlattr **attrs)
984 {
985 struct net *net = sock_net(skb->sk);
986 struct sk_buff *r_skb;
987 u32 *flags = nlmsg_data(nlh);
988 u32 sportid = NETLINK_CB(skb).portid;
989 u32 seq = nlh->nlmsg_seq;
990
991 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
992 if (r_skb == NULL)
993 return -ENOMEM;
994
995 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
996 BUG();
997
998 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
999 }
1000
1001 static inline size_t xfrm_sadinfo_msgsize(void)
1002 {
1003 return NLMSG_ALIGN(4)
1004 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1005 + nla_total_size(4); /* XFRMA_SAD_CNT */
1006 }
1007
1008 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1009 u32 portid, u32 seq, u32 flags)
1010 {
1011 struct xfrmk_sadinfo si;
1012 struct xfrmu_sadhinfo sh;
1013 struct nlmsghdr *nlh;
1014 int err;
1015 u32 *f;
1016
1017 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1018 if (nlh == NULL) /* shouldn't really happen ... */
1019 return -EMSGSIZE;
1020
1021 f = nlmsg_data(nlh);
1022 *f = flags;
1023 xfrm_sad_getinfo(net, &si);
1024
1025 sh.sadhmcnt = si.sadhmcnt;
1026 sh.sadhcnt = si.sadhcnt;
1027
1028 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1029 if (!err)
1030 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1031 if (err) {
1032 nlmsg_cancel(skb, nlh);
1033 return err;
1034 }
1035
1036 return nlmsg_end(skb, nlh);
1037 }
1038
1039 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1040 struct nlattr **attrs)
1041 {
1042 struct net *net = sock_net(skb->sk);
1043 struct sk_buff *r_skb;
1044 u32 *flags = nlmsg_data(nlh);
1045 u32 sportid = NETLINK_CB(skb).portid;
1046 u32 seq = nlh->nlmsg_seq;
1047
1048 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1049 if (r_skb == NULL)
1050 return -ENOMEM;
1051
1052 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1053 BUG();
1054
1055 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1056 }
1057
1058 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1059 struct nlattr **attrs)
1060 {
1061 struct net *net = sock_net(skb->sk);
1062 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1063 struct xfrm_state *x;
1064 struct sk_buff *resp_skb;
1065 int err = -ESRCH;
1066
1067 x = xfrm_user_state_lookup(net, p, attrs, &err);
1068 if (x == NULL)
1069 goto out_noput;
1070
1071 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1072 if (IS_ERR(resp_skb)) {
1073 err = PTR_ERR(resp_skb);
1074 } else {
1075 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1076 }
1077 xfrm_state_put(x);
1078 out_noput:
1079 return err;
1080 }
1081
1082 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1083 struct nlattr **attrs)
1084 {
1085 struct net *net = sock_net(skb->sk);
1086 struct xfrm_state *x;
1087 struct xfrm_userspi_info *p;
1088 struct sk_buff *resp_skb;
1089 xfrm_address_t *daddr;
1090 int family;
1091 int err;
1092 u32 mark;
1093 struct xfrm_mark m;
1094
1095 p = nlmsg_data(nlh);
1096 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1097 if (err)
1098 goto out_noput;
1099
1100 family = p->info.family;
1101 daddr = &p->info.id.daddr;
1102
1103 x = NULL;
1104
1105 mark = xfrm_mark_get(attrs, &m);
1106 if (p->info.seq) {
1107 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1108 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1109 xfrm_state_put(x);
1110 x = NULL;
1111 }
1112 }
1113
1114 if (!x)
1115 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1116 p->info.id.proto, daddr,
1117 &p->info.saddr, 1,
1118 family);
1119 err = -ENOENT;
1120 if (x == NULL)
1121 goto out_noput;
1122
1123 err = xfrm_alloc_spi(x, p->min, p->max);
1124 if (err)
1125 goto out;
1126
1127 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1128 if (IS_ERR(resp_skb)) {
1129 err = PTR_ERR(resp_skb);
1130 goto out;
1131 }
1132
1133 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1134
1135 out:
1136 xfrm_state_put(x);
1137 out_noput:
1138 return err;
1139 }
1140
1141 static int verify_policy_dir(u8 dir)
1142 {
1143 switch (dir) {
1144 case XFRM_POLICY_IN:
1145 case XFRM_POLICY_OUT:
1146 case XFRM_POLICY_FWD:
1147 break;
1148
1149 default:
1150 return -EINVAL;
1151 }
1152
1153 return 0;
1154 }
1155
1156 static int verify_policy_type(u8 type)
1157 {
1158 switch (type) {
1159 case XFRM_POLICY_TYPE_MAIN:
1160 #ifdef CONFIG_XFRM_SUB_POLICY
1161 case XFRM_POLICY_TYPE_SUB:
1162 #endif
1163 break;
1164
1165 default:
1166 return -EINVAL;
1167 }
1168
1169 return 0;
1170 }
1171
1172 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1173 {
1174 int ret;
1175
1176 switch (p->share) {
1177 case XFRM_SHARE_ANY:
1178 case XFRM_SHARE_SESSION:
1179 case XFRM_SHARE_USER:
1180 case XFRM_SHARE_UNIQUE:
1181 break;
1182
1183 default:
1184 return -EINVAL;
1185 }
1186
1187 switch (p->action) {
1188 case XFRM_POLICY_ALLOW:
1189 case XFRM_POLICY_BLOCK:
1190 break;
1191
1192 default:
1193 return -EINVAL;
1194 }
1195
1196 switch (p->sel.family) {
1197 case AF_INET:
1198 break;
1199
1200 case AF_INET6:
1201 #if IS_ENABLED(CONFIG_IPV6)
1202 break;
1203 #else
1204 return -EAFNOSUPPORT;
1205 #endif
1206
1207 default:
1208 return -EINVAL;
1209 }
1210
1211 ret = verify_policy_dir(p->dir);
1212 if (ret)
1213 return ret;
1214 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1215 return -EINVAL;
1216
1217 return 0;
1218 }
1219
1220 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1221 {
1222 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1223 struct xfrm_user_sec_ctx *uctx;
1224
1225 if (!rt)
1226 return 0;
1227
1228 uctx = nla_data(rt);
1229 return security_xfrm_policy_alloc(&pol->security, uctx);
1230 }
1231
1232 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1233 int nr)
1234 {
1235 int i;
1236
1237 xp->xfrm_nr = nr;
1238 for (i = 0; i < nr; i++, ut++) {
1239 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1240
1241 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1242 memcpy(&t->saddr, &ut->saddr,
1243 sizeof(xfrm_address_t));
1244 t->reqid = ut->reqid;
1245 t->mode = ut->mode;
1246 t->share = ut->share;
1247 t->optional = ut->optional;
1248 t->aalgos = ut->aalgos;
1249 t->ealgos = ut->ealgos;
1250 t->calgos = ut->calgos;
1251 /* If all masks are ~0, then we allow all algorithms. */
1252 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1253 t->encap_family = ut->family;
1254 }
1255 }
1256
1257 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1258 {
1259 int i;
1260
1261 if (nr > XFRM_MAX_DEPTH)
1262 return -EINVAL;
1263
1264 for (i = 0; i < nr; i++) {
1265 /* We never validated the ut->family value, so many
1266 * applications simply leave it at zero. The check was
1267 * never made and ut->family was ignored because all
1268 * templates could be assumed to have the same family as
1269 * the policy itself. Now that we will have ipv4-in-ipv6
1270 * and ipv6-in-ipv4 tunnels, this is no longer true.
1271 */
1272 if (!ut[i].family)
1273 ut[i].family = family;
1274
1275 switch (ut[i].family) {
1276 case AF_INET:
1277 break;
1278 #if IS_ENABLED(CONFIG_IPV6)
1279 case AF_INET6:
1280 break;
1281 #endif
1282 default:
1283 return -EINVAL;
1284 }
1285 }
1286
1287 return 0;
1288 }
1289
1290 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1291 {
1292 struct nlattr *rt = attrs[XFRMA_TMPL];
1293
1294 if (!rt) {
1295 pol->xfrm_nr = 0;
1296 } else {
1297 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1298 int nr = nla_len(rt) / sizeof(*utmpl);
1299 int err;
1300
1301 err = validate_tmpl(nr, utmpl, pol->family);
1302 if (err)
1303 return err;
1304
1305 copy_templates(pol, utmpl, nr);
1306 }
1307 return 0;
1308 }
1309
1310 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1311 {
1312 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1313 struct xfrm_userpolicy_type *upt;
1314 u8 type = XFRM_POLICY_TYPE_MAIN;
1315 int err;
1316
1317 if (rt) {
1318 upt = nla_data(rt);
1319 type = upt->type;
1320 }
1321
1322 err = verify_policy_type(type);
1323 if (err)
1324 return err;
1325
1326 *tp = type;
1327 return 0;
1328 }
1329
1330 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1331 {
1332 xp->priority = p->priority;
1333 xp->index = p->index;
1334 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1335 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1336 xp->action = p->action;
1337 xp->flags = p->flags;
1338 xp->family = p->sel.family;
1339 /* XXX xp->share = p->share; */
1340 }
1341
1342 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1343 {
1344 memset(p, 0, sizeof(*p));
1345 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1346 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1347 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1348 p->priority = xp->priority;
1349 p->index = xp->index;
1350 p->sel.family = xp->family;
1351 p->dir = dir;
1352 p->action = xp->action;
1353 p->flags = xp->flags;
1354 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1355 }
1356
1357 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1358 {
1359 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1360 int err;
1361
1362 if (!xp) {
1363 *errp = -ENOMEM;
1364 return NULL;
1365 }
1366
1367 copy_from_user_policy(xp, p);
1368
1369 err = copy_from_user_policy_type(&xp->type, attrs);
1370 if (err)
1371 goto error;
1372
1373 if (!(err = copy_from_user_tmpl(xp, attrs)))
1374 err = copy_from_user_sec_ctx(xp, attrs);
1375 if (err)
1376 goto error;
1377
1378 xfrm_mark_get(attrs, &xp->mark);
1379
1380 return xp;
1381 error:
1382 *errp = err;
1383 xp->walk.dead = 1;
1384 xfrm_policy_destroy(xp);
1385 return NULL;
1386 }
1387
1388 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1389 struct nlattr **attrs)
1390 {
1391 struct net *net = sock_net(skb->sk);
1392 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1393 struct xfrm_policy *xp;
1394 struct km_event c;
1395 int err;
1396 int excl;
1397 kuid_t loginuid = audit_get_loginuid(current);
1398 unsigned int sessionid = audit_get_sessionid(current);
1399 u32 sid;
1400
1401 err = verify_newpolicy_info(p);
1402 if (err)
1403 return err;
1404 err = verify_sec_ctx_len(attrs);
1405 if (err)
1406 return err;
1407
1408 xp = xfrm_policy_construct(net, p, attrs, &err);
1409 if (!xp)
1410 return err;
1411
1412 /* shouldn't excl be based on nlh flags??
1413 * Aha! this is anti-netlink really i.e more pfkey derived
1414 * in netlink excl is a flag and you wouldnt need
1415 * a type XFRM_MSG_UPDPOLICY - JHS */
1416 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1417 err = xfrm_policy_insert(p->dir, xp, excl);
1418 security_task_getsecid(current, &sid);
1419 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1420
1421 if (err) {
1422 security_xfrm_policy_free(xp->security);
1423 kfree(xp);
1424 return err;
1425 }
1426
1427 c.event = nlh->nlmsg_type;
1428 c.seq = nlh->nlmsg_seq;
1429 c.portid = nlh->nlmsg_pid;
1430 km_policy_notify(xp, p->dir, &c);
1431
1432 xfrm_pol_put(xp);
1433
1434 return 0;
1435 }
1436
1437 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1438 {
1439 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1440 int i;
1441
1442 if (xp->xfrm_nr == 0)
1443 return 0;
1444
1445 for (i = 0; i < xp->xfrm_nr; i++) {
1446 struct xfrm_user_tmpl *up = &vec[i];
1447 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1448
1449 memset(up, 0, sizeof(*up));
1450 memcpy(&up->id, &kp->id, sizeof(up->id));
1451 up->family = kp->encap_family;
1452 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1453 up->reqid = kp->reqid;
1454 up->mode = kp->mode;
1455 up->share = kp->share;
1456 up->optional = kp->optional;
1457 up->aalgos = kp->aalgos;
1458 up->ealgos = kp->ealgos;
1459 up->calgos = kp->calgos;
1460 }
1461
1462 return nla_put(skb, XFRMA_TMPL,
1463 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1464 }
1465
1466 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1467 {
1468 if (x->security) {
1469 return copy_sec_ctx(x->security, skb);
1470 }
1471 return 0;
1472 }
1473
1474 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1475 {
1476 if (xp->security)
1477 return copy_sec_ctx(xp->security, skb);
1478 return 0;
1479 }
1480 static inline size_t userpolicy_type_attrsize(void)
1481 {
1482 #ifdef CONFIG_XFRM_SUB_POLICY
1483 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1484 #else
1485 return 0;
1486 #endif
1487 }
1488
1489 #ifdef CONFIG_XFRM_SUB_POLICY
1490 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1491 {
1492 struct xfrm_userpolicy_type upt = {
1493 .type = type,
1494 };
1495
1496 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1497 }
1498
1499 #else
1500 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1501 {
1502 return 0;
1503 }
1504 #endif
1505
1506 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1507 {
1508 struct xfrm_dump_info *sp = ptr;
1509 struct xfrm_userpolicy_info *p;
1510 struct sk_buff *in_skb = sp->in_skb;
1511 struct sk_buff *skb = sp->out_skb;
1512 struct nlmsghdr *nlh;
1513 int err;
1514
1515 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1516 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1517 if (nlh == NULL)
1518 return -EMSGSIZE;
1519
1520 p = nlmsg_data(nlh);
1521 copy_to_user_policy(xp, p, dir);
1522 err = copy_to_user_tmpl(xp, skb);
1523 if (!err)
1524 err = copy_to_user_sec_ctx(xp, skb);
1525 if (!err)
1526 err = copy_to_user_policy_type(xp->type, skb);
1527 if (!err)
1528 err = xfrm_mark_put(skb, &xp->mark);
1529 if (err) {
1530 nlmsg_cancel(skb, nlh);
1531 return err;
1532 }
1533 nlmsg_end(skb, nlh);
1534 return 0;
1535 }
1536
1537 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1538 {
1539 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1540 struct net *net = sock_net(cb->skb->sk);
1541
1542 xfrm_policy_walk_done(walk, net);
1543 return 0;
1544 }
1545
1546 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1547 {
1548 struct net *net = sock_net(skb->sk);
1549 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1550 struct xfrm_dump_info info;
1551
1552 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1553 sizeof(cb->args) - sizeof(cb->args[0]));
1554
1555 info.in_skb = cb->skb;
1556 info.out_skb = skb;
1557 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1558 info.nlmsg_flags = NLM_F_MULTI;
1559
1560 if (!cb->args[0]) {
1561 cb->args[0] = 1;
1562 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1563 }
1564
1565 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1566
1567 return skb->len;
1568 }
1569
1570 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1571 struct xfrm_policy *xp,
1572 int dir, u32 seq)
1573 {
1574 struct xfrm_dump_info info;
1575 struct sk_buff *skb;
1576 int err;
1577
1578 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1579 if (!skb)
1580 return ERR_PTR(-ENOMEM);
1581
1582 info.in_skb = in_skb;
1583 info.out_skb = skb;
1584 info.nlmsg_seq = seq;
1585 info.nlmsg_flags = 0;
1586
1587 err = dump_one_policy(xp, dir, 0, &info);
1588 if (err) {
1589 kfree_skb(skb);
1590 return ERR_PTR(err);
1591 }
1592
1593 return skb;
1594 }
1595
1596 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1597 struct nlattr **attrs)
1598 {
1599 struct net *net = sock_net(skb->sk);
1600 struct xfrm_policy *xp;
1601 struct xfrm_userpolicy_id *p;
1602 u8 type = XFRM_POLICY_TYPE_MAIN;
1603 int err;
1604 struct km_event c;
1605 int delete;
1606 struct xfrm_mark m;
1607 u32 mark = xfrm_mark_get(attrs, &m);
1608
1609 p = nlmsg_data(nlh);
1610 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1611
1612 err = copy_from_user_policy_type(&type, attrs);
1613 if (err)
1614 return err;
1615
1616 err = verify_policy_dir(p->dir);
1617 if (err)
1618 return err;
1619
1620 if (p->index)
1621 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1622 else {
1623 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1624 struct xfrm_sec_ctx *ctx;
1625
1626 err = verify_sec_ctx_len(attrs);
1627 if (err)
1628 return err;
1629
1630 ctx = NULL;
1631 if (rt) {
1632 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1633
1634 err = security_xfrm_policy_alloc(&ctx, uctx);
1635 if (err)
1636 return err;
1637 }
1638 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1639 ctx, delete, &err);
1640 security_xfrm_policy_free(ctx);
1641 }
1642 if (xp == NULL)
1643 return -ENOENT;
1644
1645 if (!delete) {
1646 struct sk_buff *resp_skb;
1647
1648 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1649 if (IS_ERR(resp_skb)) {
1650 err = PTR_ERR(resp_skb);
1651 } else {
1652 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1653 NETLINK_CB(skb).portid);
1654 }
1655 } else {
1656 kuid_t loginuid = audit_get_loginuid(current);
1657 unsigned int sessionid = audit_get_sessionid(current);
1658 u32 sid;
1659
1660 security_task_getsecid(current, &sid);
1661 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1662 sid);
1663
1664 if (err != 0)
1665 goto out;
1666
1667 c.data.byid = p->index;
1668 c.event = nlh->nlmsg_type;
1669 c.seq = nlh->nlmsg_seq;
1670 c.portid = nlh->nlmsg_pid;
1671 km_policy_notify(xp, p->dir, &c);
1672 }
1673
1674 out:
1675 xfrm_pol_put(xp);
1676 if (delete && err == 0)
1677 xfrm_garbage_collect(net);
1678 return err;
1679 }
1680
1681 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1682 struct nlattr **attrs)
1683 {
1684 struct net *net = sock_net(skb->sk);
1685 struct km_event c;
1686 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1687 struct xfrm_audit audit_info;
1688 int err;
1689
1690 audit_info.loginuid = audit_get_loginuid(current);
1691 audit_info.sessionid = audit_get_sessionid(current);
1692 security_task_getsecid(current, &audit_info.secid);
1693 err = xfrm_state_flush(net, p->proto, &audit_info);
1694 if (err) {
1695 if (err == -ESRCH) /* empty table */
1696 return 0;
1697 return err;
1698 }
1699 c.data.proto = p->proto;
1700 c.event = nlh->nlmsg_type;
1701 c.seq = nlh->nlmsg_seq;
1702 c.portid = nlh->nlmsg_pid;
1703 c.net = net;
1704 km_state_notify(NULL, &c);
1705
1706 return 0;
1707 }
1708
1709 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1710 {
1711 size_t replay_size = x->replay_esn ?
1712 xfrm_replay_state_esn_len(x->replay_esn) :
1713 sizeof(struct xfrm_replay_state);
1714
1715 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1716 + nla_total_size(replay_size)
1717 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1718 + nla_total_size(sizeof(struct xfrm_mark))
1719 + nla_total_size(4) /* XFRM_AE_RTHR */
1720 + nla_total_size(4); /* XFRM_AE_ETHR */
1721 }
1722
1723 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1724 {
1725 struct xfrm_aevent_id *id;
1726 struct nlmsghdr *nlh;
1727 int err;
1728
1729 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1730 if (nlh == NULL)
1731 return -EMSGSIZE;
1732
1733 id = nlmsg_data(nlh);
1734 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1735 id->sa_id.spi = x->id.spi;
1736 id->sa_id.family = x->props.family;
1737 id->sa_id.proto = x->id.proto;
1738 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1739 id->reqid = x->props.reqid;
1740 id->flags = c->data.aevent;
1741
1742 if (x->replay_esn) {
1743 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1744 xfrm_replay_state_esn_len(x->replay_esn),
1745 x->replay_esn);
1746 } else {
1747 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1748 &x->replay);
1749 }
1750 if (err)
1751 goto out_cancel;
1752 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1753 if (err)
1754 goto out_cancel;
1755
1756 if (id->flags & XFRM_AE_RTHR) {
1757 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1758 if (err)
1759 goto out_cancel;
1760 }
1761 if (id->flags & XFRM_AE_ETHR) {
1762 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1763 x->replay_maxage * 10 / HZ);
1764 if (err)
1765 goto out_cancel;
1766 }
1767 err = xfrm_mark_put(skb, &x->mark);
1768 if (err)
1769 goto out_cancel;
1770
1771 return nlmsg_end(skb, nlh);
1772
1773 out_cancel:
1774 nlmsg_cancel(skb, nlh);
1775 return err;
1776 }
1777
1778 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1779 struct nlattr **attrs)
1780 {
1781 struct net *net = sock_net(skb->sk);
1782 struct xfrm_state *x;
1783 struct sk_buff *r_skb;
1784 int err;
1785 struct km_event c;
1786 u32 mark;
1787 struct xfrm_mark m;
1788 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1789 struct xfrm_usersa_id *id = &p->sa_id;
1790
1791 mark = xfrm_mark_get(attrs, &m);
1792
1793 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1794 if (x == NULL)
1795 return -ESRCH;
1796
1797 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1798 if (r_skb == NULL) {
1799 xfrm_state_put(x);
1800 return -ENOMEM;
1801 }
1802
1803 /*
1804 * XXX: is this lock really needed - none of the other
1805 * gets lock (the concern is things getting updated
1806 * while we are still reading) - jhs
1807 */
1808 spin_lock_bh(&x->lock);
1809 c.data.aevent = p->flags;
1810 c.seq = nlh->nlmsg_seq;
1811 c.portid = nlh->nlmsg_pid;
1812
1813 if (build_aevent(r_skb, x, &c) < 0)
1814 BUG();
1815 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1816 spin_unlock_bh(&x->lock);
1817 xfrm_state_put(x);
1818 return err;
1819 }
1820
1821 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1822 struct nlattr **attrs)
1823 {
1824 struct net *net = sock_net(skb->sk);
1825 struct xfrm_state *x;
1826 struct km_event c;
1827 int err = -EINVAL;
1828 u32 mark = 0;
1829 struct xfrm_mark m;
1830 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1831 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1832 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1833 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1834
1835 if (!lt && !rp && !re)
1836 return err;
1837
1838 /* pedantic mode - thou shalt sayeth replaceth */
1839 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1840 return err;
1841
1842 mark = xfrm_mark_get(attrs, &m);
1843
1844 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1845 if (x == NULL)
1846 return -ESRCH;
1847
1848 if (x->km.state != XFRM_STATE_VALID)
1849 goto out;
1850
1851 err = xfrm_replay_verify_len(x->replay_esn, re);
1852 if (err)
1853 goto out;
1854
1855 spin_lock_bh(&x->lock);
1856 xfrm_update_ae_params(x, attrs, 1);
1857 spin_unlock_bh(&x->lock);
1858
1859 c.event = nlh->nlmsg_type;
1860 c.seq = nlh->nlmsg_seq;
1861 c.portid = nlh->nlmsg_pid;
1862 c.data.aevent = XFRM_AE_CU;
1863 km_state_notify(x, &c);
1864 err = 0;
1865 out:
1866 xfrm_state_put(x);
1867 return err;
1868 }
1869
1870 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1871 struct nlattr **attrs)
1872 {
1873 struct net *net = sock_net(skb->sk);
1874 struct km_event c;
1875 u8 type = XFRM_POLICY_TYPE_MAIN;
1876 int err;
1877 struct xfrm_audit audit_info;
1878
1879 err = copy_from_user_policy_type(&type, attrs);
1880 if (err)
1881 return err;
1882
1883 audit_info.loginuid = audit_get_loginuid(current);
1884 audit_info.sessionid = audit_get_sessionid(current);
1885 security_task_getsecid(current, &audit_info.secid);
1886 err = xfrm_policy_flush(net, type, &audit_info);
1887 if (err) {
1888 if (err == -ESRCH) /* empty table */
1889 return 0;
1890 return err;
1891 }
1892
1893 c.data.type = type;
1894 c.event = nlh->nlmsg_type;
1895 c.seq = nlh->nlmsg_seq;
1896 c.portid = nlh->nlmsg_pid;
1897 c.net = net;
1898 km_policy_notify(NULL, 0, &c);
1899 return 0;
1900 }
1901
1902 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1903 struct nlattr **attrs)
1904 {
1905 struct net *net = sock_net(skb->sk);
1906 struct xfrm_policy *xp;
1907 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1908 struct xfrm_userpolicy_info *p = &up->pol;
1909 u8 type = XFRM_POLICY_TYPE_MAIN;
1910 int err = -ENOENT;
1911 struct xfrm_mark m;
1912 u32 mark = xfrm_mark_get(attrs, &m);
1913
1914 err = copy_from_user_policy_type(&type, attrs);
1915 if (err)
1916 return err;
1917
1918 err = verify_policy_dir(p->dir);
1919 if (err)
1920 return err;
1921
1922 if (p->index)
1923 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1924 else {
1925 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1926 struct xfrm_sec_ctx *ctx;
1927
1928 err = verify_sec_ctx_len(attrs);
1929 if (err)
1930 return err;
1931
1932 ctx = NULL;
1933 if (rt) {
1934 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1935
1936 err = security_xfrm_policy_alloc(&ctx, uctx);
1937 if (err)
1938 return err;
1939 }
1940 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1941 &p->sel, ctx, 0, &err);
1942 security_xfrm_policy_free(ctx);
1943 }
1944 if (xp == NULL)
1945 return -ENOENT;
1946
1947 if (unlikely(xp->walk.dead))
1948 goto out;
1949
1950 err = 0;
1951 if (up->hard) {
1952 kuid_t loginuid = audit_get_loginuid(current);
1953 unsigned int sessionid = audit_get_sessionid(current);
1954 u32 sid;
1955
1956 security_task_getsecid(current, &sid);
1957 xfrm_policy_delete(xp, p->dir);
1958 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1959
1960 } else {
1961 // reset the timers here?
1962 WARN(1, "Dont know what to do with soft policy expire\n");
1963 }
1964 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1965
1966 out:
1967 xfrm_pol_put(xp);
1968 return err;
1969 }
1970
1971 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1972 struct nlattr **attrs)
1973 {
1974 struct net *net = sock_net(skb->sk);
1975 struct xfrm_state *x;
1976 int err;
1977 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1978 struct xfrm_usersa_info *p = &ue->state;
1979 struct xfrm_mark m;
1980 u32 mark = xfrm_mark_get(attrs, &m);
1981
1982 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1983
1984 err = -ENOENT;
1985 if (x == NULL)
1986 return err;
1987
1988 spin_lock_bh(&x->lock);
1989 err = -EINVAL;
1990 if (x->km.state != XFRM_STATE_VALID)
1991 goto out;
1992 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
1993
1994 if (ue->hard) {
1995 kuid_t loginuid = audit_get_loginuid(current);
1996 unsigned int sessionid = audit_get_sessionid(current);
1997 u32 sid;
1998
1999 security_task_getsecid(current, &sid);
2000 __xfrm_state_delete(x);
2001 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
2002 }
2003 err = 0;
2004 out:
2005 spin_unlock_bh(&x->lock);
2006 xfrm_state_put(x);
2007 return err;
2008 }
2009
2010 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2011 struct nlattr **attrs)
2012 {
2013 struct net *net = sock_net(skb->sk);
2014 struct xfrm_policy *xp;
2015 struct xfrm_user_tmpl *ut;
2016 int i;
2017 struct nlattr *rt = attrs[XFRMA_TMPL];
2018 struct xfrm_mark mark;
2019
2020 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2021 struct xfrm_state *x = xfrm_state_alloc(net);
2022 int err = -ENOMEM;
2023
2024 if (!x)
2025 goto nomem;
2026
2027 xfrm_mark_get(attrs, &mark);
2028
2029 err = verify_newpolicy_info(&ua->policy);
2030 if (err)
2031 goto bad_policy;
2032
2033 /* build an XP */
2034 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2035 if (!xp)
2036 goto free_state;
2037
2038 memcpy(&x->id, &ua->id, sizeof(ua->id));
2039 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2040 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2041 xp->mark.m = x->mark.m = mark.m;
2042 xp->mark.v = x->mark.v = mark.v;
2043 ut = nla_data(rt);
2044 /* extract the templates and for each call km_key */
2045 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2046 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2047 memcpy(&x->id, &t->id, sizeof(x->id));
2048 x->props.mode = t->mode;
2049 x->props.reqid = t->reqid;
2050 x->props.family = ut->family;
2051 t->aalgos = ua->aalgos;
2052 t->ealgos = ua->ealgos;
2053 t->calgos = ua->calgos;
2054 err = km_query(x, t, xp);
2055
2056 }
2057
2058 kfree(x);
2059 kfree(xp);
2060
2061 return 0;
2062
2063 bad_policy:
2064 WARN(1, "BAD policy passed\n");
2065 free_state:
2066 kfree(x);
2067 nomem:
2068 return err;
2069 }
2070
2071 #ifdef CONFIG_XFRM_MIGRATE
2072 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2073 struct xfrm_kmaddress *k,
2074 struct nlattr **attrs, int *num)
2075 {
2076 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2077 struct xfrm_user_migrate *um;
2078 int i, num_migrate;
2079
2080 if (k != NULL) {
2081 struct xfrm_user_kmaddress *uk;
2082
2083 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2084 memcpy(&k->local, &uk->local, sizeof(k->local));
2085 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2086 k->family = uk->family;
2087 k->reserved = uk->reserved;
2088 }
2089
2090 um = nla_data(rt);
2091 num_migrate = nla_len(rt) / sizeof(*um);
2092
2093 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2094 return -EINVAL;
2095
2096 for (i = 0; i < num_migrate; i++, um++, ma++) {
2097 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2098 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2099 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2100 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2101
2102 ma->proto = um->proto;
2103 ma->mode = um->mode;
2104 ma->reqid = um->reqid;
2105
2106 ma->old_family = um->old_family;
2107 ma->new_family = um->new_family;
2108 }
2109
2110 *num = i;
2111 return 0;
2112 }
2113
2114 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2115 struct nlattr **attrs)
2116 {
2117 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2118 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2119 struct xfrm_kmaddress km, *kmp;
2120 u8 type;
2121 int err;
2122 int n = 0;
2123 struct net *net = sock_net(skb->sk);
2124
2125 if (attrs[XFRMA_MIGRATE] == NULL)
2126 return -EINVAL;
2127
2128 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2129
2130 err = copy_from_user_policy_type(&type, attrs);
2131 if (err)
2132 return err;
2133
2134 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2135 if (err)
2136 return err;
2137
2138 if (!n)
2139 return 0;
2140
2141 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2142
2143 return 0;
2144 }
2145 #else
2146 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2147 struct nlattr **attrs)
2148 {
2149 return -ENOPROTOOPT;
2150 }
2151 #endif
2152
2153 #ifdef CONFIG_XFRM_MIGRATE
2154 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2155 {
2156 struct xfrm_user_migrate um;
2157
2158 memset(&um, 0, sizeof(um));
2159 um.proto = m->proto;
2160 um.mode = m->mode;
2161 um.reqid = m->reqid;
2162 um.old_family = m->old_family;
2163 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2164 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2165 um.new_family = m->new_family;
2166 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2167 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2168
2169 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2170 }
2171
2172 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2173 {
2174 struct xfrm_user_kmaddress uk;
2175
2176 memset(&uk, 0, sizeof(uk));
2177 uk.family = k->family;
2178 uk.reserved = k->reserved;
2179 memcpy(&uk.local, &k->local, sizeof(uk.local));
2180 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2181
2182 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2183 }
2184
2185 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2186 {
2187 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2188 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2189 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2190 + userpolicy_type_attrsize();
2191 }
2192
2193 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2194 int num_migrate, const struct xfrm_kmaddress *k,
2195 const struct xfrm_selector *sel, u8 dir, u8 type)
2196 {
2197 const struct xfrm_migrate *mp;
2198 struct xfrm_userpolicy_id *pol_id;
2199 struct nlmsghdr *nlh;
2200 int i, err;
2201
2202 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2203 if (nlh == NULL)
2204 return -EMSGSIZE;
2205
2206 pol_id = nlmsg_data(nlh);
2207 /* copy data from selector, dir, and type to the pol_id */
2208 memset(pol_id, 0, sizeof(*pol_id));
2209 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2210 pol_id->dir = dir;
2211
2212 if (k != NULL) {
2213 err = copy_to_user_kmaddress(k, skb);
2214 if (err)
2215 goto out_cancel;
2216 }
2217 err = copy_to_user_policy_type(type, skb);
2218 if (err)
2219 goto out_cancel;
2220 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2221 err = copy_to_user_migrate(mp, skb);
2222 if (err)
2223 goto out_cancel;
2224 }
2225
2226 return nlmsg_end(skb, nlh);
2227
2228 out_cancel:
2229 nlmsg_cancel(skb, nlh);
2230 return err;
2231 }
2232
2233 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2234 const struct xfrm_migrate *m, int num_migrate,
2235 const struct xfrm_kmaddress *k)
2236 {
2237 struct net *net = &init_net;
2238 struct sk_buff *skb;
2239
2240 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2241 if (skb == NULL)
2242 return -ENOMEM;
2243
2244 /* build migrate */
2245 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2246 BUG();
2247
2248 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2249 }
2250 #else
2251 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2252 const struct xfrm_migrate *m, int num_migrate,
2253 const struct xfrm_kmaddress *k)
2254 {
2255 return -ENOPROTOOPT;
2256 }
2257 #endif
2258
2259 #define XMSGSIZE(type) sizeof(struct type)
2260
2261 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2262 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2263 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2264 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2265 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2266 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2267 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2268 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2269 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2270 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2271 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2272 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2273 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2274 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2275 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2276 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2277 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2278 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2279 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2280 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2281 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2282 };
2283
2284 #undef XMSGSIZE
2285
2286 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2287 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2288 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2289 [XFRMA_LASTUSED] = { .type = NLA_U64},
2290 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2291 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2292 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2293 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2294 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2295 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2296 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2297 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2298 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2299 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2300 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2301 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2302 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2303 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2304 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2305 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2306 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2307 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2308 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2309 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2310 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2311 };
2312
2313 static const struct xfrm_link {
2314 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2315 int (*dump)(struct sk_buff *, struct netlink_callback *);
2316 int (*done)(struct netlink_callback *);
2317 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2318 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2319 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2320 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2321 .dump = xfrm_dump_sa,
2322 .done = xfrm_dump_sa_done },
2323 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2324 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2325 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2326 .dump = xfrm_dump_policy,
2327 .done = xfrm_dump_policy_done },
2328 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2329 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2330 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2331 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2332 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2333 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2334 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2335 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2336 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2337 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2338 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2339 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2340 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2341 };
2342
2343 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2344 {
2345 struct net *net = sock_net(skb->sk);
2346 struct nlattr *attrs[XFRMA_MAX+1];
2347 const struct xfrm_link *link;
2348 int type, err;
2349
2350 type = nlh->nlmsg_type;
2351 if (type > XFRM_MSG_MAX)
2352 return -EINVAL;
2353
2354 type -= XFRM_MSG_BASE;
2355 link = &xfrm_dispatch[type];
2356
2357 /* All operations require privileges, even GET */
2358 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2359 return -EPERM;
2360
2361 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2362 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2363 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2364 if (link->dump == NULL)
2365 return -EINVAL;
2366
2367 {
2368 struct netlink_dump_control c = {
2369 .dump = link->dump,
2370 .done = link->done,
2371 };
2372 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2373 }
2374 }
2375
2376 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2377 xfrma_policy);
2378 if (err < 0)
2379 return err;
2380
2381 if (link->doit == NULL)
2382 return -EINVAL;
2383
2384 return link->doit(skb, nlh, attrs);
2385 }
2386
2387 static void xfrm_netlink_rcv(struct sk_buff *skb)
2388 {
2389 struct net *net = sock_net(skb->sk);
2390
2391 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2392 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2393 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2394 }
2395
2396 static inline size_t xfrm_expire_msgsize(void)
2397 {
2398 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2399 + nla_total_size(sizeof(struct xfrm_mark));
2400 }
2401
2402 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2403 {
2404 struct xfrm_user_expire *ue;
2405 struct nlmsghdr *nlh;
2406 int err;
2407
2408 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2409 if (nlh == NULL)
2410 return -EMSGSIZE;
2411
2412 ue = nlmsg_data(nlh);
2413 copy_to_user_state(x, &ue->state);
2414 ue->hard = (c->data.hard != 0) ? 1 : 0;
2415
2416 err = xfrm_mark_put(skb, &x->mark);
2417 if (err)
2418 return err;
2419
2420 return nlmsg_end(skb, nlh);
2421 }
2422
2423 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2424 {
2425 struct net *net = xs_net(x);
2426 struct sk_buff *skb;
2427
2428 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2429 if (skb == NULL)
2430 return -ENOMEM;
2431
2432 if (build_expire(skb, x, c) < 0) {
2433 kfree_skb(skb);
2434 return -EMSGSIZE;
2435 }
2436
2437 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2438 }
2439
2440 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2441 {
2442 struct net *net = xs_net(x);
2443 struct sk_buff *skb;
2444
2445 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2446 if (skb == NULL)
2447 return -ENOMEM;
2448
2449 if (build_aevent(skb, x, c) < 0)
2450 BUG();
2451
2452 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2453 }
2454
2455 static int xfrm_notify_sa_flush(const struct km_event *c)
2456 {
2457 struct net *net = c->net;
2458 struct xfrm_usersa_flush *p;
2459 struct nlmsghdr *nlh;
2460 struct sk_buff *skb;
2461 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2462
2463 skb = nlmsg_new(len, GFP_ATOMIC);
2464 if (skb == NULL)
2465 return -ENOMEM;
2466
2467 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2468 if (nlh == NULL) {
2469 kfree_skb(skb);
2470 return -EMSGSIZE;
2471 }
2472
2473 p = nlmsg_data(nlh);
2474 p->proto = c->data.proto;
2475
2476 nlmsg_end(skb, nlh);
2477
2478 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2479 }
2480
2481 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2482 {
2483 size_t l = 0;
2484 if (x->aead)
2485 l += nla_total_size(aead_len(x->aead));
2486 if (x->aalg) {
2487 l += nla_total_size(sizeof(struct xfrm_algo) +
2488 (x->aalg->alg_key_len + 7) / 8);
2489 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2490 }
2491 if (x->ealg)
2492 l += nla_total_size(xfrm_alg_len(x->ealg));
2493 if (x->calg)
2494 l += nla_total_size(sizeof(*x->calg));
2495 if (x->encap)
2496 l += nla_total_size(sizeof(*x->encap));
2497 if (x->tfcpad)
2498 l += nla_total_size(sizeof(x->tfcpad));
2499 if (x->replay_esn)
2500 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2501 if (x->security)
2502 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2503 x->security->ctx_len);
2504 if (x->coaddr)
2505 l += nla_total_size(sizeof(*x->coaddr));
2506 if (x->props.extra_flags)
2507 l += nla_total_size(sizeof(x->props.extra_flags));
2508
2509 /* Must count x->lastused as it may become non-zero behind our back. */
2510 l += nla_total_size(sizeof(u64));
2511
2512 return l;
2513 }
2514
2515 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2516 {
2517 struct net *net = xs_net(x);
2518 struct xfrm_usersa_info *p;
2519 struct xfrm_usersa_id *id;
2520 struct nlmsghdr *nlh;
2521 struct sk_buff *skb;
2522 int len = xfrm_sa_len(x);
2523 int headlen, err;
2524
2525 headlen = sizeof(*p);
2526 if (c->event == XFRM_MSG_DELSA) {
2527 len += nla_total_size(headlen);
2528 headlen = sizeof(*id);
2529 len += nla_total_size(sizeof(struct xfrm_mark));
2530 }
2531 len += NLMSG_ALIGN(headlen);
2532
2533 skb = nlmsg_new(len, GFP_ATOMIC);
2534 if (skb == NULL)
2535 return -ENOMEM;
2536
2537 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2538 err = -EMSGSIZE;
2539 if (nlh == NULL)
2540 goto out_free_skb;
2541
2542 p = nlmsg_data(nlh);
2543 if (c->event == XFRM_MSG_DELSA) {
2544 struct nlattr *attr;
2545
2546 id = nlmsg_data(nlh);
2547 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2548 id->spi = x->id.spi;
2549 id->family = x->props.family;
2550 id->proto = x->id.proto;
2551
2552 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2553 err = -EMSGSIZE;
2554 if (attr == NULL)
2555 goto out_free_skb;
2556
2557 p = nla_data(attr);
2558 }
2559 err = copy_to_user_state_extra(x, p, skb);
2560 if (err)
2561 goto out_free_skb;
2562
2563 nlmsg_end(skb, nlh);
2564
2565 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2566
2567 out_free_skb:
2568 kfree_skb(skb);
2569 return err;
2570 }
2571
2572 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2573 {
2574
2575 switch (c->event) {
2576 case XFRM_MSG_EXPIRE:
2577 return xfrm_exp_state_notify(x, c);
2578 case XFRM_MSG_NEWAE:
2579 return xfrm_aevent_state_notify(x, c);
2580 case XFRM_MSG_DELSA:
2581 case XFRM_MSG_UPDSA:
2582 case XFRM_MSG_NEWSA:
2583 return xfrm_notify_sa(x, c);
2584 case XFRM_MSG_FLUSHSA:
2585 return xfrm_notify_sa_flush(c);
2586 default:
2587 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2588 c->event);
2589 break;
2590 }
2591
2592 return 0;
2593
2594 }
2595
2596 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2597 struct xfrm_policy *xp)
2598 {
2599 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2600 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2601 + nla_total_size(sizeof(struct xfrm_mark))
2602 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2603 + userpolicy_type_attrsize();
2604 }
2605
2606 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2607 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2608 {
2609 __u32 seq = xfrm_get_acqseq();
2610 struct xfrm_user_acquire *ua;
2611 struct nlmsghdr *nlh;
2612 int err;
2613
2614 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2615 if (nlh == NULL)
2616 return -EMSGSIZE;
2617
2618 ua = nlmsg_data(nlh);
2619 memcpy(&ua->id, &x->id, sizeof(ua->id));
2620 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2621 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2622 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2623 ua->aalgos = xt->aalgos;
2624 ua->ealgos = xt->ealgos;
2625 ua->calgos = xt->calgos;
2626 ua->seq = x->km.seq = seq;
2627
2628 err = copy_to_user_tmpl(xp, skb);
2629 if (!err)
2630 err = copy_to_user_state_sec_ctx(x, skb);
2631 if (!err)
2632 err = copy_to_user_policy_type(xp->type, skb);
2633 if (!err)
2634 err = xfrm_mark_put(skb, &xp->mark);
2635 if (err) {
2636 nlmsg_cancel(skb, nlh);
2637 return err;
2638 }
2639
2640 return nlmsg_end(skb, nlh);
2641 }
2642
2643 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2644 struct xfrm_policy *xp)
2645 {
2646 struct net *net = xs_net(x);
2647 struct sk_buff *skb;
2648
2649 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2650 if (skb == NULL)
2651 return -ENOMEM;
2652
2653 if (build_acquire(skb, x, xt, xp) < 0)
2654 BUG();
2655
2656 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2657 }
2658
2659 /* User gives us xfrm_user_policy_info followed by an array of 0
2660 * or more templates.
2661 */
2662 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2663 u8 *data, int len, int *dir)
2664 {
2665 struct net *net = sock_net(sk);
2666 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2667 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2668 struct xfrm_policy *xp;
2669 int nr;
2670
2671 switch (sk->sk_family) {
2672 case AF_INET:
2673 if (opt != IP_XFRM_POLICY) {
2674 *dir = -EOPNOTSUPP;
2675 return NULL;
2676 }
2677 break;
2678 #if IS_ENABLED(CONFIG_IPV6)
2679 case AF_INET6:
2680 if (opt != IPV6_XFRM_POLICY) {
2681 *dir = -EOPNOTSUPP;
2682 return NULL;
2683 }
2684 break;
2685 #endif
2686 default:
2687 *dir = -EINVAL;
2688 return NULL;
2689 }
2690
2691 *dir = -EINVAL;
2692
2693 if (len < sizeof(*p) ||
2694 verify_newpolicy_info(p))
2695 return NULL;
2696
2697 nr = ((len - sizeof(*p)) / sizeof(*ut));
2698 if (validate_tmpl(nr, ut, p->sel.family))
2699 return NULL;
2700
2701 if (p->dir > XFRM_POLICY_OUT)
2702 return NULL;
2703
2704 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2705 if (xp == NULL) {
2706 *dir = -ENOBUFS;
2707 return NULL;
2708 }
2709
2710 copy_from_user_policy(xp, p);
2711 xp->type = XFRM_POLICY_TYPE_MAIN;
2712 copy_templates(xp, ut, nr);
2713
2714 *dir = p->dir;
2715
2716 return xp;
2717 }
2718
2719 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2720 {
2721 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2722 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2723 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2724 + nla_total_size(sizeof(struct xfrm_mark))
2725 + userpolicy_type_attrsize();
2726 }
2727
2728 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2729 int dir, const struct km_event *c)
2730 {
2731 struct xfrm_user_polexpire *upe;
2732 int hard = c->data.hard;
2733 struct nlmsghdr *nlh;
2734 int err;
2735
2736 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2737 if (nlh == NULL)
2738 return -EMSGSIZE;
2739
2740 upe = nlmsg_data(nlh);
2741 copy_to_user_policy(xp, &upe->pol, dir);
2742 err = copy_to_user_tmpl(xp, skb);
2743 if (!err)
2744 err = copy_to_user_sec_ctx(xp, skb);
2745 if (!err)
2746 err = copy_to_user_policy_type(xp->type, skb);
2747 if (!err)
2748 err = xfrm_mark_put(skb, &xp->mark);
2749 if (err) {
2750 nlmsg_cancel(skb, nlh);
2751 return err;
2752 }
2753 upe->hard = !!hard;
2754
2755 return nlmsg_end(skb, nlh);
2756 }
2757
2758 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2759 {
2760 struct net *net = xp_net(xp);
2761 struct sk_buff *skb;
2762
2763 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2764 if (skb == NULL)
2765 return -ENOMEM;
2766
2767 if (build_polexpire(skb, xp, dir, c) < 0)
2768 BUG();
2769
2770 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2771 }
2772
2773 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2774 {
2775 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2776 struct net *net = xp_net(xp);
2777 struct xfrm_userpolicy_info *p;
2778 struct xfrm_userpolicy_id *id;
2779 struct nlmsghdr *nlh;
2780 struct sk_buff *skb;
2781 int headlen, err;
2782
2783 headlen = sizeof(*p);
2784 if (c->event == XFRM_MSG_DELPOLICY) {
2785 len += nla_total_size(headlen);
2786 headlen = sizeof(*id);
2787 }
2788 len += userpolicy_type_attrsize();
2789 len += nla_total_size(sizeof(struct xfrm_mark));
2790 len += NLMSG_ALIGN(headlen);
2791
2792 skb = nlmsg_new(len, GFP_ATOMIC);
2793 if (skb == NULL)
2794 return -ENOMEM;
2795
2796 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2797 err = -EMSGSIZE;
2798 if (nlh == NULL)
2799 goto out_free_skb;
2800
2801 p = nlmsg_data(nlh);
2802 if (c->event == XFRM_MSG_DELPOLICY) {
2803 struct nlattr *attr;
2804
2805 id = nlmsg_data(nlh);
2806 memset(id, 0, sizeof(*id));
2807 id->dir = dir;
2808 if (c->data.byid)
2809 id->index = xp->index;
2810 else
2811 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2812
2813 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2814 err = -EMSGSIZE;
2815 if (attr == NULL)
2816 goto out_free_skb;
2817
2818 p = nla_data(attr);
2819 }
2820
2821 copy_to_user_policy(xp, p, dir);
2822 err = copy_to_user_tmpl(xp, skb);
2823 if (!err)
2824 err = copy_to_user_policy_type(xp->type, skb);
2825 if (!err)
2826 err = xfrm_mark_put(skb, &xp->mark);
2827 if (err)
2828 goto out_free_skb;
2829
2830 nlmsg_end(skb, nlh);
2831
2832 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2833
2834 out_free_skb:
2835 kfree_skb(skb);
2836 return err;
2837 }
2838
2839 static int xfrm_notify_policy_flush(const struct km_event *c)
2840 {
2841 struct net *net = c->net;
2842 struct nlmsghdr *nlh;
2843 struct sk_buff *skb;
2844 int err;
2845
2846 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2847 if (skb == NULL)
2848 return -ENOMEM;
2849
2850 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2851 err = -EMSGSIZE;
2852 if (nlh == NULL)
2853 goto out_free_skb;
2854 err = copy_to_user_policy_type(c->data.type, skb);
2855 if (err)
2856 goto out_free_skb;
2857
2858 nlmsg_end(skb, nlh);
2859
2860 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2861
2862 out_free_skb:
2863 kfree_skb(skb);
2864 return err;
2865 }
2866
2867 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2868 {
2869
2870 switch (c->event) {
2871 case XFRM_MSG_NEWPOLICY:
2872 case XFRM_MSG_UPDPOLICY:
2873 case XFRM_MSG_DELPOLICY:
2874 return xfrm_notify_policy(xp, dir, c);
2875 case XFRM_MSG_FLUSHPOLICY:
2876 return xfrm_notify_policy_flush(c);
2877 case XFRM_MSG_POLEXPIRE:
2878 return xfrm_exp_policy_notify(xp, dir, c);
2879 default:
2880 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2881 c->event);
2882 }
2883
2884 return 0;
2885
2886 }
2887
2888 static inline size_t xfrm_report_msgsize(void)
2889 {
2890 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2891 }
2892
2893 static int build_report(struct sk_buff *skb, u8 proto,
2894 struct xfrm_selector *sel, xfrm_address_t *addr)
2895 {
2896 struct xfrm_user_report *ur;
2897 struct nlmsghdr *nlh;
2898
2899 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2900 if (nlh == NULL)
2901 return -EMSGSIZE;
2902
2903 ur = nlmsg_data(nlh);
2904 ur->proto = proto;
2905 memcpy(&ur->sel, sel, sizeof(ur->sel));
2906
2907 if (addr) {
2908 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2909 if (err) {
2910 nlmsg_cancel(skb, nlh);
2911 return err;
2912 }
2913 }
2914 return nlmsg_end(skb, nlh);
2915 }
2916
2917 static int xfrm_send_report(struct net *net, u8 proto,
2918 struct xfrm_selector *sel, xfrm_address_t *addr)
2919 {
2920 struct sk_buff *skb;
2921
2922 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2923 if (skb == NULL)
2924 return -ENOMEM;
2925
2926 if (build_report(skb, proto, sel, addr) < 0)
2927 BUG();
2928
2929 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2930 }
2931
2932 static inline size_t xfrm_mapping_msgsize(void)
2933 {
2934 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2935 }
2936
2937 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2938 xfrm_address_t *new_saddr, __be16 new_sport)
2939 {
2940 struct xfrm_user_mapping *um;
2941 struct nlmsghdr *nlh;
2942
2943 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2944 if (nlh == NULL)
2945 return -EMSGSIZE;
2946
2947 um = nlmsg_data(nlh);
2948
2949 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2950 um->id.spi = x->id.spi;
2951 um->id.family = x->props.family;
2952 um->id.proto = x->id.proto;
2953 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2954 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2955 um->new_sport = new_sport;
2956 um->old_sport = x->encap->encap_sport;
2957 um->reqid = x->props.reqid;
2958
2959 return nlmsg_end(skb, nlh);
2960 }
2961
2962 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2963 __be16 sport)
2964 {
2965 struct net *net = xs_net(x);
2966 struct sk_buff *skb;
2967
2968 if (x->id.proto != IPPROTO_ESP)
2969 return -EINVAL;
2970
2971 if (!x->encap)
2972 return -EINVAL;
2973
2974 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2975 if (skb == NULL)
2976 return -ENOMEM;
2977
2978 if (build_mapping(skb, x, ipaddr, sport) < 0)
2979 BUG();
2980
2981 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2982 }
2983
2984 static struct xfrm_mgr netlink_mgr = {
2985 .id = "netlink",
2986 .notify = xfrm_send_state_notify,
2987 .acquire = xfrm_send_acquire,
2988 .compile_policy = xfrm_compile_policy,
2989 .notify_policy = xfrm_send_policy_notify,
2990 .report = xfrm_send_report,
2991 .migrate = xfrm_send_migrate,
2992 .new_mapping = xfrm_send_mapping,
2993 };
2994
2995 static int __net_init xfrm_user_net_init(struct net *net)
2996 {
2997 struct sock *nlsk;
2998 struct netlink_kernel_cfg cfg = {
2999 .groups = XFRMNLGRP_MAX,
3000 .input = xfrm_netlink_rcv,
3001 };
3002
3003 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3004 if (nlsk == NULL)
3005 return -ENOMEM;
3006 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3007 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3008 return 0;
3009 }
3010
3011 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3012 {
3013 struct net *net;
3014 list_for_each_entry(net, net_exit_list, exit_list)
3015 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3016 synchronize_net();
3017 list_for_each_entry(net, net_exit_list, exit_list)
3018 netlink_kernel_release(net->xfrm.nlsk_stash);
3019 }
3020
3021 static struct pernet_operations xfrm_user_net_ops = {
3022 .init = xfrm_user_net_init,
3023 .exit_batch = xfrm_user_net_exit,
3024 };
3025
3026 static int __init xfrm_user_init(void)
3027 {
3028 int rv;
3029
3030 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3031
3032 rv = register_pernet_subsys(&xfrm_user_net_ops);
3033 if (rv < 0)
3034 return rv;
3035 rv = xfrm_register_km(&netlink_mgr);
3036 if (rv < 0)
3037 unregister_pernet_subsys(&xfrm_user_net_ops);
3038 return rv;
3039 }
3040
3041 static void __exit xfrm_user_exit(void)
3042 {
3043 xfrm_unregister_km(&netlink_mgr);
3044 unregister_pernet_subsys(&xfrm_user_net_ops);
3045 }
3046
3047 module_init(xfrm_user_init);
3048 module_exit(xfrm_user_exit);
3049 MODULE_LICENSE("GPL");
3050 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3051
Linux kernel - Deliverables
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