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frv: Select GENERIC_HARDIRQS_NO_DEPRECATED
[cris-mirror.git] / net / xfrm / xfrm_user.c
blobfc152d28753c41df6bd7e26becee2b1657a3ace8
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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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 (!rt)
128 return 0;
129
130 if (p->replay_window != 0)
131 return -EINVAL;
132
133 return 0;
134 }
135
136 static int verify_newsa_info(struct xfrm_usersa_info *p,
137 struct nlattr **attrs)
138 {
139 int err;
140
141 err = -EINVAL;
142 switch (p->family) {
143 case AF_INET:
144 break;
145
146 case AF_INET6:
147 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
148 break;
149 #else
150 err = -EAFNOSUPPORT;
151 goto out;
152 #endif
153
154 default:
155 goto out;
156 }
157
158 err = -EINVAL;
159 switch (p->id.proto) {
160 case IPPROTO_AH:
161 if ((!attrs[XFRMA_ALG_AUTH] &&
162 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
163 attrs[XFRMA_ALG_AEAD] ||
164 attrs[XFRMA_ALG_CRYPT] ||
165 attrs[XFRMA_ALG_COMP] ||
166 attrs[XFRMA_TFCPAD])
167 goto out;
168 break;
169
170 case IPPROTO_ESP:
171 if (attrs[XFRMA_ALG_COMP])
172 goto out;
173 if (!attrs[XFRMA_ALG_AUTH] &&
174 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
175 !attrs[XFRMA_ALG_CRYPT] &&
176 !attrs[XFRMA_ALG_AEAD])
177 goto out;
178 if ((attrs[XFRMA_ALG_AUTH] ||
179 attrs[XFRMA_ALG_AUTH_TRUNC] ||
180 attrs[XFRMA_ALG_CRYPT]) &&
181 attrs[XFRMA_ALG_AEAD])
182 goto out;
183 if (attrs[XFRMA_TFCPAD] &&
184 p->mode != XFRM_MODE_TUNNEL)
185 goto out;
186 break;
187
188 case IPPROTO_COMP:
189 if (!attrs[XFRMA_ALG_COMP] ||
190 attrs[XFRMA_ALG_AEAD] ||
191 attrs[XFRMA_ALG_AUTH] ||
192 attrs[XFRMA_ALG_AUTH_TRUNC] ||
193 attrs[XFRMA_ALG_CRYPT] ||
194 attrs[XFRMA_TFCPAD])
195 goto out;
196 break;
197
198 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
199 case IPPROTO_DSTOPTS:
200 case IPPROTO_ROUTING:
201 if (attrs[XFRMA_ALG_COMP] ||
202 attrs[XFRMA_ALG_AUTH] ||
203 attrs[XFRMA_ALG_AUTH_TRUNC] ||
204 attrs[XFRMA_ALG_AEAD] ||
205 attrs[XFRMA_ALG_CRYPT] ||
206 attrs[XFRMA_ENCAP] ||
207 attrs[XFRMA_SEC_CTX] ||
208 attrs[XFRMA_TFCPAD] ||
209 !attrs[XFRMA_COADDR])
210 goto out;
211 break;
212 #endif
213
214 default:
215 goto out;
216 }
217
218 if ((err = verify_aead(attrs)))
219 goto out;
220 if ((err = verify_auth_trunc(attrs)))
221 goto out;
222 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
223 goto out;
224 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
225 goto out;
226 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
227 goto out;
228 if ((err = verify_sec_ctx_len(attrs)))
229 goto out;
230 if ((err = verify_replay(p, attrs)))
231 goto out;
232
233 err = -EINVAL;
234 switch (p->mode) {
235 case XFRM_MODE_TRANSPORT:
236 case XFRM_MODE_TUNNEL:
237 case XFRM_MODE_ROUTEOPTIMIZATION:
238 case XFRM_MODE_BEET:
239 break;
240
241 default:
242 goto out;
243 }
244
245 err = 0;
246
247 out:
248 return err;
249 }
250
251 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
252 struct xfrm_algo_desc *(*get_byname)(const char *, int),
253 struct nlattr *rta)
254 {
255 struct xfrm_algo *p, *ualg;
256 struct xfrm_algo_desc *algo;
257
258 if (!rta)
259 return 0;
260
261 ualg = nla_data(rta);
262
263 algo = get_byname(ualg->alg_name, 1);
264 if (!algo)
265 return -ENOSYS;
266 *props = algo->desc.sadb_alg_id;
267
268 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
269 if (!p)
270 return -ENOMEM;
271
272 strcpy(p->alg_name, algo->name);
273 *algpp = p;
274 return 0;
275 }
276
277 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
278 struct nlattr *rta)
279 {
280 struct xfrm_algo *ualg;
281 struct xfrm_algo_auth *p;
282 struct xfrm_algo_desc *algo;
283
284 if (!rta)
285 return 0;
286
287 ualg = nla_data(rta);
288
289 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
290 if (!algo)
291 return -ENOSYS;
292 *props = algo->desc.sadb_alg_id;
293
294 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
295 if (!p)
296 return -ENOMEM;
297
298 strcpy(p->alg_name, algo->name);
299 p->alg_key_len = ualg->alg_key_len;
300 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
301 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
302
303 *algpp = p;
304 return 0;
305 }
306
307 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
308 struct nlattr *rta)
309 {
310 struct xfrm_algo_auth *p, *ualg;
311 struct xfrm_algo_desc *algo;
312
313 if (!rta)
314 return 0;
315
316 ualg = nla_data(rta);
317
318 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
319 if (!algo)
320 return -ENOSYS;
321 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
322 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
323 return -EINVAL;
324 *props = algo->desc.sadb_alg_id;
325
326 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
327 if (!p)
328 return -ENOMEM;
329
330 strcpy(p->alg_name, algo->name);
331 if (!p->alg_trunc_len)
332 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
333
334 *algpp = p;
335 return 0;
336 }
337
338 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
339 struct nlattr *rta)
340 {
341 struct xfrm_algo_aead *p, *ualg;
342 struct xfrm_algo_desc *algo;
343
344 if (!rta)
345 return 0;
346
347 ualg = nla_data(rta);
348
349 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
350 if (!algo)
351 return -ENOSYS;
352 *props = algo->desc.sadb_alg_id;
353
354 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
355 if (!p)
356 return -ENOMEM;
357
358 strcpy(p->alg_name, algo->name);
359 *algpp = p;
360 return 0;
361 }
362
363 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
364 struct xfrm_replay_state_esn **preplay_esn,
365 struct nlattr *rta)
366 {
367 struct xfrm_replay_state_esn *p, *pp, *up;
368
369 if (!rta)
370 return 0;
371
372 up = nla_data(rta);
373
374 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
375 if (!p)
376 return -ENOMEM;
377
378 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
379 if (!pp) {
380 kfree(p);
381 return -ENOMEM;
382 }
383
384 *replay_esn = p;
385 *preplay_esn = pp;
386
387 return 0;
388 }
389
390 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
391 {
392 int len = 0;
393
394 if (xfrm_ctx) {
395 len += sizeof(struct xfrm_user_sec_ctx);
396 len += xfrm_ctx->ctx_len;
397 }
398 return len;
399 }
400
401 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
402 {
403 memcpy(&x->id, &p->id, sizeof(x->id));
404 memcpy(&x->sel, &p->sel, sizeof(x->sel));
405 memcpy(&x->lft, &p->lft, sizeof(x->lft));
406 x->props.mode = p->mode;
407 x->props.replay_window = p->replay_window;
408 x->props.reqid = p->reqid;
409 x->props.family = p->family;
410 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
411 x->props.flags = p->flags;
412
413 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
414 x->sel.family = p->family;
415 }
416
417 /*
418 * someday when pfkey also has support, we could have the code
419 * somehow made shareable and move it to xfrm_state.c - JHS
420 *
421 */
422 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
423 {
424 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
425 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
426 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
427 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
428 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
429
430 if (re) {
431 struct xfrm_replay_state_esn *replay_esn;
432 replay_esn = nla_data(re);
433 memcpy(x->replay_esn, replay_esn,
434 xfrm_replay_state_esn_len(replay_esn));
435 memcpy(x->preplay_esn, replay_esn,
436 xfrm_replay_state_esn_len(replay_esn));
437 }
438
439 if (rp) {
440 struct xfrm_replay_state *replay;
441 replay = nla_data(rp);
442 memcpy(&x->replay, replay, sizeof(*replay));
443 memcpy(&x->preplay, replay, sizeof(*replay));
444 }
445
446 if (lt) {
447 struct xfrm_lifetime_cur *ltime;
448 ltime = nla_data(lt);
449 x->curlft.bytes = ltime->bytes;
450 x->curlft.packets = ltime->packets;
451 x->curlft.add_time = ltime->add_time;
452 x->curlft.use_time = ltime->use_time;
453 }
454
455 if (et)
456 x->replay_maxage = nla_get_u32(et);
457
458 if (rt)
459 x->replay_maxdiff = nla_get_u32(rt);
460 }
461
462 static struct xfrm_state *xfrm_state_construct(struct net *net,
463 struct xfrm_usersa_info *p,
464 struct nlattr **attrs,
465 int *errp)
466 {
467 struct xfrm_state *x = xfrm_state_alloc(net);
468 int err = -ENOMEM;
469
470 if (!x)
471 goto error_no_put;
472
473 copy_from_user_state(x, p);
474
475 if ((err = attach_aead(&x->aead, &x->props.ealgo,
476 attrs[XFRMA_ALG_AEAD])))
477 goto error;
478 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
479 attrs[XFRMA_ALG_AUTH_TRUNC])))
480 goto error;
481 if (!x->props.aalgo) {
482 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
483 attrs[XFRMA_ALG_AUTH])))
484 goto error;
485 }
486 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
487 xfrm_ealg_get_byname,
488 attrs[XFRMA_ALG_CRYPT])))
489 goto error;
490 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
491 xfrm_calg_get_byname,
492 attrs[XFRMA_ALG_COMP])))
493 goto error;
494
495 if (attrs[XFRMA_ENCAP]) {
496 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
497 sizeof(*x->encap), GFP_KERNEL);
498 if (x->encap == NULL)
499 goto error;
500 }
501
502 if (attrs[XFRMA_TFCPAD])
503 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
504
505 if (attrs[XFRMA_COADDR]) {
506 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
507 sizeof(*x->coaddr), GFP_KERNEL);
508 if (x->coaddr == NULL)
509 goto error;
510 }
511
512 xfrm_mark_get(attrs, &x->mark);
513
514 err = __xfrm_init_state(x, false);
515 if (err)
516 goto error;
517
518 if (attrs[XFRMA_SEC_CTX] &&
519 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
520 goto error;
521
522 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
523 attrs[XFRMA_REPLAY_ESN_VAL])))
524 goto error;
525
526 x->km.seq = p->seq;
527 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
528 /* sysctl_xfrm_aevent_etime is in 100ms units */
529 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
530
531 if ((err = xfrm_init_replay(x)))
532 goto error;
533
534 /* override default values from above */
535 xfrm_update_ae_params(x, attrs);
536
537 return x;
538
539 error:
540 x->km.state = XFRM_STATE_DEAD;
541 xfrm_state_put(x);
542 error_no_put:
543 *errp = err;
544 return NULL;
545 }
546
547 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
548 struct nlattr **attrs)
549 {
550 struct net *net = sock_net(skb->sk);
551 struct xfrm_usersa_info *p = nlmsg_data(nlh);
552 struct xfrm_state *x;
553 int err;
554 struct km_event c;
555 uid_t loginuid = audit_get_loginuid(current);
556 u32 sessionid = audit_get_sessionid(current);
557 u32 sid;
558
559 err = verify_newsa_info(p, attrs);
560 if (err)
561 return err;
562
563 x = xfrm_state_construct(net, p, attrs, &err);
564 if (!x)
565 return err;
566
567 xfrm_state_hold(x);
568 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
569 err = xfrm_state_add(x);
570 else
571 err = xfrm_state_update(x);
572
573 security_task_getsecid(current, &sid);
574 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
575
576 if (err < 0) {
577 x->km.state = XFRM_STATE_DEAD;
578 __xfrm_state_put(x);
579 goto out;
580 }
581
582 c.seq = nlh->nlmsg_seq;
583 c.pid = nlh->nlmsg_pid;
584 c.event = nlh->nlmsg_type;
585
586 km_state_notify(x, &c);
587 out:
588 xfrm_state_put(x);
589 return err;
590 }
591
592 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
593 struct xfrm_usersa_id *p,
594 struct nlattr **attrs,
595 int *errp)
596 {
597 struct xfrm_state *x = NULL;
598 struct xfrm_mark m;
599 int err;
600 u32 mark = xfrm_mark_get(attrs, &m);
601
602 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
603 err = -ESRCH;
604 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
605 } else {
606 xfrm_address_t *saddr = NULL;
607
608 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
609 if (!saddr) {
610 err = -EINVAL;
611 goto out;
612 }
613
614 err = -ESRCH;
615 x = xfrm_state_lookup_byaddr(net, mark,
616 &p->daddr, saddr,
617 p->proto, p->family);
618 }
619
620 out:
621 if (!x && errp)
622 *errp = err;
623 return x;
624 }
625
626 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
627 struct nlattr **attrs)
628 {
629 struct net *net = sock_net(skb->sk);
630 struct xfrm_state *x;
631 int err = -ESRCH;
632 struct km_event c;
633 struct xfrm_usersa_id *p = nlmsg_data(nlh);
634 uid_t loginuid = audit_get_loginuid(current);
635 u32 sessionid = audit_get_sessionid(current);
636 u32 sid;
637
638 x = xfrm_user_state_lookup(net, p, attrs, &err);
639 if (x == NULL)
640 return err;
641
642 if ((err = security_xfrm_state_delete(x)) != 0)
643 goto out;
644
645 if (xfrm_state_kern(x)) {
646 err = -EPERM;
647 goto out;
648 }
649
650 err = xfrm_state_delete(x);
651
652 if (err < 0)
653 goto out;
654
655 c.seq = nlh->nlmsg_seq;
656 c.pid = nlh->nlmsg_pid;
657 c.event = nlh->nlmsg_type;
658 km_state_notify(x, &c);
659
660 out:
661 security_task_getsecid(current, &sid);
662 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
663 xfrm_state_put(x);
664 return err;
665 }
666
667 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
668 {
669 memcpy(&p->id, &x->id, sizeof(p->id));
670 memcpy(&p->sel, &x->sel, sizeof(p->sel));
671 memcpy(&p->lft, &x->lft, sizeof(p->lft));
672 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
673 memcpy(&p->stats, &x->stats, sizeof(p->stats));
674 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
675 p->mode = x->props.mode;
676 p->replay_window = x->props.replay_window;
677 p->reqid = x->props.reqid;
678 p->family = x->props.family;
679 p->flags = x->props.flags;
680 p->seq = x->km.seq;
681 }
682
683 struct xfrm_dump_info {
684 struct sk_buff *in_skb;
685 struct sk_buff *out_skb;
686 u32 nlmsg_seq;
687 u16 nlmsg_flags;
688 };
689
690 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
691 {
692 struct xfrm_user_sec_ctx *uctx;
693 struct nlattr *attr;
694 int ctx_size = sizeof(*uctx) + s->ctx_len;
695
696 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
697 if (attr == NULL)
698 return -EMSGSIZE;
699
700 uctx = nla_data(attr);
701 uctx->exttype = XFRMA_SEC_CTX;
702 uctx->len = ctx_size;
703 uctx->ctx_doi = s->ctx_doi;
704 uctx->ctx_alg = s->ctx_alg;
705 uctx->ctx_len = s->ctx_len;
706 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
707
708 return 0;
709 }
710
711 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
712 {
713 struct xfrm_algo *algo;
714 struct nlattr *nla;
715
716 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
717 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
718 if (!nla)
719 return -EMSGSIZE;
720
721 algo = nla_data(nla);
722 strcpy(algo->alg_name, auth->alg_name);
723 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
724 algo->alg_key_len = auth->alg_key_len;
725
726 return 0;
727 }
728
729 /* Don't change this without updating xfrm_sa_len! */
730 static int copy_to_user_state_extra(struct xfrm_state *x,
731 struct xfrm_usersa_info *p,
732 struct sk_buff *skb)
733 {
734 copy_to_user_state(x, p);
735
736 if (x->coaddr)
737 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
738
739 if (x->lastused)
740 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
741
742 if (x->aead)
743 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
744 if (x->aalg) {
745 if (copy_to_user_auth(x->aalg, skb))
746 goto nla_put_failure;
747
748 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC,
749 xfrm_alg_auth_len(x->aalg), x->aalg);
750 }
751 if (x->ealg)
752 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
753 if (x->calg)
754 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
755
756 if (x->encap)
757 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
758
759 if (x->tfcpad)
760 NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad);
761
762 if (xfrm_mark_put(skb, &x->mark))
763 goto nla_put_failure;
764
765 if (x->replay_esn)
766 NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
767 xfrm_replay_state_esn_len(x->replay_esn), x->replay_esn);
768
769 if (x->security && copy_sec_ctx(x->security, skb) < 0)
770 goto nla_put_failure;
771
772 return 0;
773
774 nla_put_failure:
775 return -EMSGSIZE;
776 }
777
778 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
779 {
780 struct xfrm_dump_info *sp = ptr;
781 struct sk_buff *in_skb = sp->in_skb;
782 struct sk_buff *skb = sp->out_skb;
783 struct xfrm_usersa_info *p;
784 struct nlmsghdr *nlh;
785 int err;
786
787 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
788 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
789 if (nlh == NULL)
790 return -EMSGSIZE;
791
792 p = nlmsg_data(nlh);
793
794 err = copy_to_user_state_extra(x, p, skb);
795 if (err)
796 goto nla_put_failure;
797
798 nlmsg_end(skb, nlh);
799 return 0;
800
801 nla_put_failure:
802 nlmsg_cancel(skb, nlh);
803 return err;
804 }
805
806 static int xfrm_dump_sa_done(struct netlink_callback *cb)
807 {
808 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
809 xfrm_state_walk_done(walk);
810 return 0;
811 }
812
813 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
814 {
815 struct net *net = sock_net(skb->sk);
816 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
817 struct xfrm_dump_info info;
818
819 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
820 sizeof(cb->args) - sizeof(cb->args[0]));
821
822 info.in_skb = cb->skb;
823 info.out_skb = skb;
824 info.nlmsg_seq = cb->nlh->nlmsg_seq;
825 info.nlmsg_flags = NLM_F_MULTI;
826
827 if (!cb->args[0]) {
828 cb->args[0] = 1;
829 xfrm_state_walk_init(walk, 0);
830 }
831
832 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
833
834 return skb->len;
835 }
836
837 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
838 struct xfrm_state *x, u32 seq)
839 {
840 struct xfrm_dump_info info;
841 struct sk_buff *skb;
842
843 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
844 if (!skb)
845 return ERR_PTR(-ENOMEM);
846
847 info.in_skb = in_skb;
848 info.out_skb = skb;
849 info.nlmsg_seq = seq;
850 info.nlmsg_flags = 0;
851
852 if (dump_one_state(x, 0, &info)) {
853 kfree_skb(skb);
854 return NULL;
855 }
856
857 return skb;
858 }
859
860 static inline size_t xfrm_spdinfo_msgsize(void)
861 {
862 return NLMSG_ALIGN(4)
863 + nla_total_size(sizeof(struct xfrmu_spdinfo))
864 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
865 }
866
867 static int build_spdinfo(struct sk_buff *skb, struct net *net,
868 u32 pid, u32 seq, u32 flags)
869 {
870 struct xfrmk_spdinfo si;
871 struct xfrmu_spdinfo spc;
872 struct xfrmu_spdhinfo sph;
873 struct nlmsghdr *nlh;
874 u32 *f;
875
876 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
877 if (nlh == NULL) /* shouldnt really happen ... */
878 return -EMSGSIZE;
879
880 f = nlmsg_data(nlh);
881 *f = flags;
882 xfrm_spd_getinfo(net, &si);
883 spc.incnt = si.incnt;
884 spc.outcnt = si.outcnt;
885 spc.fwdcnt = si.fwdcnt;
886 spc.inscnt = si.inscnt;
887 spc.outscnt = si.outscnt;
888 spc.fwdscnt = si.fwdscnt;
889 sph.spdhcnt = si.spdhcnt;
890 sph.spdhmcnt = si.spdhmcnt;
891
892 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
893 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
894
895 return nlmsg_end(skb, nlh);
896
897 nla_put_failure:
898 nlmsg_cancel(skb, nlh);
899 return -EMSGSIZE;
900 }
901
902 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
903 struct nlattr **attrs)
904 {
905 struct net *net = sock_net(skb->sk);
906 struct sk_buff *r_skb;
907 u32 *flags = nlmsg_data(nlh);
908 u32 spid = NETLINK_CB(skb).pid;
909 u32 seq = nlh->nlmsg_seq;
910
911 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
912 if (r_skb == NULL)
913 return -ENOMEM;
914
915 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
916 BUG();
917
918 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
919 }
920
921 static inline size_t xfrm_sadinfo_msgsize(void)
922 {
923 return NLMSG_ALIGN(4)
924 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
925 + nla_total_size(4); /* XFRMA_SAD_CNT */
926 }
927
928 static int build_sadinfo(struct sk_buff *skb, struct net *net,
929 u32 pid, u32 seq, u32 flags)
930 {
931 struct xfrmk_sadinfo si;
932 struct xfrmu_sadhinfo sh;
933 struct nlmsghdr *nlh;
934 u32 *f;
935
936 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
937 if (nlh == NULL) /* shouldnt really happen ... */
938 return -EMSGSIZE;
939
940 f = nlmsg_data(nlh);
941 *f = flags;
942 xfrm_sad_getinfo(net, &si);
943
944 sh.sadhmcnt = si.sadhmcnt;
945 sh.sadhcnt = si.sadhcnt;
946
947 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
948 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
949
950 return nlmsg_end(skb, nlh);
951
952 nla_put_failure:
953 nlmsg_cancel(skb, nlh);
954 return -EMSGSIZE;
955 }
956
957 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
958 struct nlattr **attrs)
959 {
960 struct net *net = sock_net(skb->sk);
961 struct sk_buff *r_skb;
962 u32 *flags = nlmsg_data(nlh);
963 u32 spid = NETLINK_CB(skb).pid;
964 u32 seq = nlh->nlmsg_seq;
965
966 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
967 if (r_skb == NULL)
968 return -ENOMEM;
969
970 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
971 BUG();
972
973 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
974 }
975
976 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
977 struct nlattr **attrs)
978 {
979 struct net *net = sock_net(skb->sk);
980 struct xfrm_usersa_id *p = nlmsg_data(nlh);
981 struct xfrm_state *x;
982 struct sk_buff *resp_skb;
983 int err = -ESRCH;
984
985 x = xfrm_user_state_lookup(net, p, attrs, &err);
986 if (x == NULL)
987 goto out_noput;
988
989 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
990 if (IS_ERR(resp_skb)) {
991 err = PTR_ERR(resp_skb);
992 } else {
993 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
994 }
995 xfrm_state_put(x);
996 out_noput:
997 return err;
998 }
999
1000 static int verify_userspi_info(struct xfrm_userspi_info *p)
1001 {
1002 switch (p->info.id.proto) {
1003 case IPPROTO_AH:
1004 case IPPROTO_ESP:
1005 break;
1006
1007 case IPPROTO_COMP:
1008 /* IPCOMP spi is 16-bits. */
1009 if (p->max >= 0x10000)
1010 return -EINVAL;
1011 break;
1012
1013 default:
1014 return -EINVAL;
1015 }
1016
1017 if (p->min > p->max)
1018 return -EINVAL;
1019
1020 return 0;
1021 }
1022
1023 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1024 struct nlattr **attrs)
1025 {
1026 struct net *net = sock_net(skb->sk);
1027 struct xfrm_state *x;
1028 struct xfrm_userspi_info *p;
1029 struct sk_buff *resp_skb;
1030 xfrm_address_t *daddr;
1031 int family;
1032 int err;
1033 u32 mark;
1034 struct xfrm_mark m;
1035
1036 p = nlmsg_data(nlh);
1037 err = verify_userspi_info(p);
1038 if (err)
1039 goto out_noput;
1040
1041 family = p->info.family;
1042 daddr = &p->info.id.daddr;
1043
1044 x = NULL;
1045
1046 mark = xfrm_mark_get(attrs, &m);
1047 if (p->info.seq) {
1048 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1049 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1050 xfrm_state_put(x);
1051 x = NULL;
1052 }
1053 }
1054
1055 if (!x)
1056 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1057 p->info.id.proto, daddr,
1058 &p->info.saddr, 1,
1059 family);
1060 err = -ENOENT;
1061 if (x == NULL)
1062 goto out_noput;
1063
1064 err = xfrm_alloc_spi(x, p->min, p->max);
1065 if (err)
1066 goto out;
1067
1068 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1069 if (IS_ERR(resp_skb)) {
1070 err = PTR_ERR(resp_skb);
1071 goto out;
1072 }
1073
1074 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1075
1076 out:
1077 xfrm_state_put(x);
1078 out_noput:
1079 return err;
1080 }
1081
1082 static int verify_policy_dir(u8 dir)
1083 {
1084 switch (dir) {
1085 case XFRM_POLICY_IN:
1086 case XFRM_POLICY_OUT:
1087 case XFRM_POLICY_FWD:
1088 break;
1089
1090 default:
1091 return -EINVAL;
1092 }
1093
1094 return 0;
1095 }
1096
1097 static int verify_policy_type(u8 type)
1098 {
1099 switch (type) {
1100 case XFRM_POLICY_TYPE_MAIN:
1101 #ifdef CONFIG_XFRM_SUB_POLICY
1102 case XFRM_POLICY_TYPE_SUB:
1103 #endif
1104 break;
1105
1106 default:
1107 return -EINVAL;
1108 }
1109
1110 return 0;
1111 }
1112
1113 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1114 {
1115 switch (p->share) {
1116 case XFRM_SHARE_ANY:
1117 case XFRM_SHARE_SESSION:
1118 case XFRM_SHARE_USER:
1119 case XFRM_SHARE_UNIQUE:
1120 break;
1121
1122 default:
1123 return -EINVAL;
1124 }
1125
1126 switch (p->action) {
1127 case XFRM_POLICY_ALLOW:
1128 case XFRM_POLICY_BLOCK:
1129 break;
1130
1131 default:
1132 return -EINVAL;
1133 }
1134
1135 switch (p->sel.family) {
1136 case AF_INET:
1137 break;
1138
1139 case AF_INET6:
1140 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1141 break;
1142 #else
1143 return -EAFNOSUPPORT;
1144 #endif
1145
1146 default:
1147 return -EINVAL;
1148 }
1149
1150 return verify_policy_dir(p->dir);
1151 }
1152
1153 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1154 {
1155 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1156 struct xfrm_user_sec_ctx *uctx;
1157
1158 if (!rt)
1159 return 0;
1160
1161 uctx = nla_data(rt);
1162 return security_xfrm_policy_alloc(&pol->security, uctx);
1163 }
1164
1165 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1166 int nr)
1167 {
1168 int i;
1169
1170 xp->xfrm_nr = nr;
1171 for (i = 0; i < nr; i++, ut++) {
1172 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1173
1174 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1175 memcpy(&t->saddr, &ut->saddr,
1176 sizeof(xfrm_address_t));
1177 t->reqid = ut->reqid;
1178 t->mode = ut->mode;
1179 t->share = ut->share;
1180 t->optional = ut->optional;
1181 t->aalgos = ut->aalgos;
1182 t->ealgos = ut->ealgos;
1183 t->calgos = ut->calgos;
1184 /* If all masks are ~0, then we allow all algorithms. */
1185 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1186 t->encap_family = ut->family;
1187 }
1188 }
1189
1190 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1191 {
1192 int i;
1193
1194 if (nr > XFRM_MAX_DEPTH)
1195 return -EINVAL;
1196
1197 for (i = 0; i < nr; i++) {
1198 /* We never validated the ut->family value, so many
1199 * applications simply leave it at zero. The check was
1200 * never made and ut->family was ignored because all
1201 * templates could be assumed to have the same family as
1202 * the policy itself. Now that we will have ipv4-in-ipv6
1203 * and ipv6-in-ipv4 tunnels, this is no longer true.
1204 */
1205 if (!ut[i].family)
1206 ut[i].family = family;
1207
1208 switch (ut[i].family) {
1209 case AF_INET:
1210 break;
1211 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1212 case AF_INET6:
1213 break;
1214 #endif
1215 default:
1216 return -EINVAL;
1217 }
1218 }
1219
1220 return 0;
1221 }
1222
1223 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1224 {
1225 struct nlattr *rt = attrs[XFRMA_TMPL];
1226
1227 if (!rt) {
1228 pol->xfrm_nr = 0;
1229 } else {
1230 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1231 int nr = nla_len(rt) / sizeof(*utmpl);
1232 int err;
1233
1234 err = validate_tmpl(nr, utmpl, pol->family);
1235 if (err)
1236 return err;
1237
1238 copy_templates(pol, utmpl, nr);
1239 }
1240 return 0;
1241 }
1242
1243 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1244 {
1245 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1246 struct xfrm_userpolicy_type *upt;
1247 u8 type = XFRM_POLICY_TYPE_MAIN;
1248 int err;
1249
1250 if (rt) {
1251 upt = nla_data(rt);
1252 type = upt->type;
1253 }
1254
1255 err = verify_policy_type(type);
1256 if (err)
1257 return err;
1258
1259 *tp = type;
1260 return 0;
1261 }
1262
1263 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1264 {
1265 xp->priority = p->priority;
1266 xp->index = p->index;
1267 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1268 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1269 xp->action = p->action;
1270 xp->flags = p->flags;
1271 xp->family = p->sel.family;
1272 /* XXX xp->share = p->share; */
1273 }
1274
1275 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1276 {
1277 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1278 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1279 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1280 p->priority = xp->priority;
1281 p->index = xp->index;
1282 p->sel.family = xp->family;
1283 p->dir = dir;
1284 p->action = xp->action;
1285 p->flags = xp->flags;
1286 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1287 }
1288
1289 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1290 {
1291 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1292 int err;
1293
1294 if (!xp) {
1295 *errp = -ENOMEM;
1296 return NULL;
1297 }
1298
1299 copy_from_user_policy(xp, p);
1300
1301 err = copy_from_user_policy_type(&xp->type, attrs);
1302 if (err)
1303 goto error;
1304
1305 if (!(err = copy_from_user_tmpl(xp, attrs)))
1306 err = copy_from_user_sec_ctx(xp, attrs);
1307 if (err)
1308 goto error;
1309
1310 xfrm_mark_get(attrs, &xp->mark);
1311
1312 return xp;
1313 error:
1314 *errp = err;
1315 xp->walk.dead = 1;
1316 xfrm_policy_destroy(xp);
1317 return NULL;
1318 }
1319
1320 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1321 struct nlattr **attrs)
1322 {
1323 struct net *net = sock_net(skb->sk);
1324 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1325 struct xfrm_policy *xp;
1326 struct km_event c;
1327 int err;
1328 int excl;
1329 uid_t loginuid = audit_get_loginuid(current);
1330 u32 sessionid = audit_get_sessionid(current);
1331 u32 sid;
1332
1333 err = verify_newpolicy_info(p);
1334 if (err)
1335 return err;
1336 err = verify_sec_ctx_len(attrs);
1337 if (err)
1338 return err;
1339
1340 xp = xfrm_policy_construct(net, p, attrs, &err);
1341 if (!xp)
1342 return err;
1343
1344 /* shouldnt excl be based on nlh flags??
1345 * Aha! this is anti-netlink really i.e more pfkey derived
1346 * in netlink excl is a flag and you wouldnt need
1347 * a type XFRM_MSG_UPDPOLICY - JHS */
1348 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1349 err = xfrm_policy_insert(p->dir, xp, excl);
1350 security_task_getsecid(current, &sid);
1351 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1352
1353 if (err) {
1354 security_xfrm_policy_free(xp->security);
1355 kfree(xp);
1356 return err;
1357 }
1358
1359 c.event = nlh->nlmsg_type;
1360 c.seq = nlh->nlmsg_seq;
1361 c.pid = nlh->nlmsg_pid;
1362 km_policy_notify(xp, p->dir, &c);
1363
1364 xfrm_pol_put(xp);
1365
1366 return 0;
1367 }
1368
1369 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1370 {
1371 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1372 int i;
1373
1374 if (xp->xfrm_nr == 0)
1375 return 0;
1376
1377 for (i = 0; i < xp->xfrm_nr; i++) {
1378 struct xfrm_user_tmpl *up = &vec[i];
1379 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1380
1381 memcpy(&up->id, &kp->id, sizeof(up->id));
1382 up->family = kp->encap_family;
1383 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1384 up->reqid = kp->reqid;
1385 up->mode = kp->mode;
1386 up->share = kp->share;
1387 up->optional = kp->optional;
1388 up->aalgos = kp->aalgos;
1389 up->ealgos = kp->ealgos;
1390 up->calgos = kp->calgos;
1391 }
1392
1393 return nla_put(skb, XFRMA_TMPL,
1394 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1395 }
1396
1397 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1398 {
1399 if (x->security) {
1400 return copy_sec_ctx(x->security, skb);
1401 }
1402 return 0;
1403 }
1404
1405 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1406 {
1407 if (xp->security) {
1408 return copy_sec_ctx(xp->security, skb);
1409 }
1410 return 0;
1411 }
1412 static inline size_t userpolicy_type_attrsize(void)
1413 {
1414 #ifdef CONFIG_XFRM_SUB_POLICY
1415 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1416 #else
1417 return 0;
1418 #endif
1419 }
1420
1421 #ifdef CONFIG_XFRM_SUB_POLICY
1422 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1423 {
1424 struct xfrm_userpolicy_type upt = {
1425 .type = type,
1426 };
1427
1428 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1429 }
1430
1431 #else
1432 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1433 {
1434 return 0;
1435 }
1436 #endif
1437
1438 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1439 {
1440 struct xfrm_dump_info *sp = ptr;
1441 struct xfrm_userpolicy_info *p;
1442 struct sk_buff *in_skb = sp->in_skb;
1443 struct sk_buff *skb = sp->out_skb;
1444 struct nlmsghdr *nlh;
1445
1446 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1447 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1448 if (nlh == NULL)
1449 return -EMSGSIZE;
1450
1451 p = nlmsg_data(nlh);
1452 copy_to_user_policy(xp, p, dir);
1453 if (copy_to_user_tmpl(xp, skb) < 0)
1454 goto nlmsg_failure;
1455 if (copy_to_user_sec_ctx(xp, skb))
1456 goto nlmsg_failure;
1457 if (copy_to_user_policy_type(xp->type, skb) < 0)
1458 goto nlmsg_failure;
1459 if (xfrm_mark_put(skb, &xp->mark))
1460 goto nla_put_failure;
1461
1462 nlmsg_end(skb, nlh);
1463 return 0;
1464
1465 nla_put_failure:
1466 nlmsg_failure:
1467 nlmsg_cancel(skb, nlh);
1468 return -EMSGSIZE;
1469 }
1470
1471 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1472 {
1473 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1474
1475 xfrm_policy_walk_done(walk);
1476 return 0;
1477 }
1478
1479 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1480 {
1481 struct net *net = sock_net(skb->sk);
1482 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1483 struct xfrm_dump_info info;
1484
1485 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1486 sizeof(cb->args) - sizeof(cb->args[0]));
1487
1488 info.in_skb = cb->skb;
1489 info.out_skb = skb;
1490 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1491 info.nlmsg_flags = NLM_F_MULTI;
1492
1493 if (!cb->args[0]) {
1494 cb->args[0] = 1;
1495 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1496 }
1497
1498 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1499
1500 return skb->len;
1501 }
1502
1503 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1504 struct xfrm_policy *xp,
1505 int dir, u32 seq)
1506 {
1507 struct xfrm_dump_info info;
1508 struct sk_buff *skb;
1509
1510 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1511 if (!skb)
1512 return ERR_PTR(-ENOMEM);
1513
1514 info.in_skb = in_skb;
1515 info.out_skb = skb;
1516 info.nlmsg_seq = seq;
1517 info.nlmsg_flags = 0;
1518
1519 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1520 kfree_skb(skb);
1521 return NULL;
1522 }
1523
1524 return skb;
1525 }
1526
1527 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1528 struct nlattr **attrs)
1529 {
1530 struct net *net = sock_net(skb->sk);
1531 struct xfrm_policy *xp;
1532 struct xfrm_userpolicy_id *p;
1533 u8 type = XFRM_POLICY_TYPE_MAIN;
1534 int err;
1535 struct km_event c;
1536 int delete;
1537 struct xfrm_mark m;
1538 u32 mark = xfrm_mark_get(attrs, &m);
1539
1540 p = nlmsg_data(nlh);
1541 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1542
1543 err = copy_from_user_policy_type(&type, attrs);
1544 if (err)
1545 return err;
1546
1547 err = verify_policy_dir(p->dir);
1548 if (err)
1549 return err;
1550
1551 if (p->index)
1552 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1553 else {
1554 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1555 struct xfrm_sec_ctx *ctx;
1556
1557 err = verify_sec_ctx_len(attrs);
1558 if (err)
1559 return err;
1560
1561 ctx = NULL;
1562 if (rt) {
1563 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1564
1565 err = security_xfrm_policy_alloc(&ctx, uctx);
1566 if (err)
1567 return err;
1568 }
1569 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1570 ctx, delete, &err);
1571 security_xfrm_policy_free(ctx);
1572 }
1573 if (xp == NULL)
1574 return -ENOENT;
1575
1576 if (!delete) {
1577 struct sk_buff *resp_skb;
1578
1579 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1580 if (IS_ERR(resp_skb)) {
1581 err = PTR_ERR(resp_skb);
1582 } else {
1583 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1584 NETLINK_CB(skb).pid);
1585 }
1586 } else {
1587 uid_t loginuid = audit_get_loginuid(current);
1588 u32 sessionid = audit_get_sessionid(current);
1589 u32 sid;
1590
1591 security_task_getsecid(current, &sid);
1592 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1593 sid);
1594
1595 if (err != 0)
1596 goto out;
1597
1598 c.data.byid = p->index;
1599 c.event = nlh->nlmsg_type;
1600 c.seq = nlh->nlmsg_seq;
1601 c.pid = nlh->nlmsg_pid;
1602 km_policy_notify(xp, p->dir, &c);
1603 }
1604
1605 out:
1606 xfrm_pol_put(xp);
1607 return err;
1608 }
1609
1610 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1611 struct nlattr **attrs)
1612 {
1613 struct net *net = sock_net(skb->sk);
1614 struct km_event c;
1615 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1616 struct xfrm_audit audit_info;
1617 int err;
1618
1619 audit_info.loginuid = audit_get_loginuid(current);
1620 audit_info.sessionid = audit_get_sessionid(current);
1621 security_task_getsecid(current, &audit_info.secid);
1622 err = xfrm_state_flush(net, p->proto, &audit_info);
1623 if (err) {
1624 if (err == -ESRCH) /* empty table */
1625 return 0;
1626 return err;
1627 }
1628 c.data.proto = p->proto;
1629 c.event = nlh->nlmsg_type;
1630 c.seq = nlh->nlmsg_seq;
1631 c.pid = nlh->nlmsg_pid;
1632 c.net = net;
1633 km_state_notify(NULL, &c);
1634
1635 return 0;
1636 }
1637
1638 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1639 {
1640 size_t replay_size = x->replay_esn ?
1641 xfrm_replay_state_esn_len(x->replay_esn) :
1642 sizeof(struct xfrm_replay_state);
1643
1644 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1645 + nla_total_size(replay_size)
1646 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1647 + nla_total_size(sizeof(struct xfrm_mark))
1648 + nla_total_size(4) /* XFRM_AE_RTHR */
1649 + nla_total_size(4); /* XFRM_AE_ETHR */
1650 }
1651
1652 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1653 {
1654 struct xfrm_aevent_id *id;
1655 struct nlmsghdr *nlh;
1656
1657 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1658 if (nlh == NULL)
1659 return -EMSGSIZE;
1660
1661 id = nlmsg_data(nlh);
1662 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1663 id->sa_id.spi = x->id.spi;
1664 id->sa_id.family = x->props.family;
1665 id->sa_id.proto = x->id.proto;
1666 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1667 id->reqid = x->props.reqid;
1668 id->flags = c->data.aevent;
1669
1670 if (x->replay_esn)
1671 NLA_PUT(skb, XFRMA_REPLAY_ESN_VAL,
1672 xfrm_replay_state_esn_len(x->replay_esn),
1673 x->replay_esn);
1674 else
1675 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1676
1677 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1678
1679 if (id->flags & XFRM_AE_RTHR)
1680 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1681
1682 if (id->flags & XFRM_AE_ETHR)
1683 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1684 x->replay_maxage * 10 / HZ);
1685
1686 if (xfrm_mark_put(skb, &x->mark))
1687 goto nla_put_failure;
1688
1689 return nlmsg_end(skb, nlh);
1690
1691 nla_put_failure:
1692 nlmsg_cancel(skb, nlh);
1693 return -EMSGSIZE;
1694 }
1695
1696 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1697 struct nlattr **attrs)
1698 {
1699 struct net *net = sock_net(skb->sk);
1700 struct xfrm_state *x;
1701 struct sk_buff *r_skb;
1702 int err;
1703 struct km_event c;
1704 u32 mark;
1705 struct xfrm_mark m;
1706 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1707 struct xfrm_usersa_id *id = &p->sa_id;
1708
1709 mark = xfrm_mark_get(attrs, &m);
1710
1711 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1712 if (x == NULL)
1713 return -ESRCH;
1714
1715 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1716 if (r_skb == NULL) {
1717 xfrm_state_put(x);
1718 return -ENOMEM;
1719 }
1720
1721 /*
1722 * XXX: is this lock really needed - none of the other
1723 * gets lock (the concern is things getting updated
1724 * while we are still reading) - jhs
1725 */
1726 spin_lock_bh(&x->lock);
1727 c.data.aevent = p->flags;
1728 c.seq = nlh->nlmsg_seq;
1729 c.pid = nlh->nlmsg_pid;
1730
1731 if (build_aevent(r_skb, x, &c) < 0)
1732 BUG();
1733 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1734 spin_unlock_bh(&x->lock);
1735 xfrm_state_put(x);
1736 return err;
1737 }
1738
1739 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1740 struct nlattr **attrs)
1741 {
1742 struct net *net = sock_net(skb->sk);
1743 struct xfrm_state *x;
1744 struct km_event c;
1745 int err = - EINVAL;
1746 u32 mark = 0;
1747 struct xfrm_mark m;
1748 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1749 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1750 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1751 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1752
1753 if (!lt && !rp && !re)
1754 return err;
1755
1756 /* pedantic mode - thou shalt sayeth replaceth */
1757 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1758 return err;
1759
1760 mark = xfrm_mark_get(attrs, &m);
1761
1762 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1763 if (x == NULL)
1764 return -ESRCH;
1765
1766 if (x->km.state != XFRM_STATE_VALID)
1767 goto out;
1768
1769 spin_lock_bh(&x->lock);
1770 xfrm_update_ae_params(x, attrs);
1771 spin_unlock_bh(&x->lock);
1772
1773 c.event = nlh->nlmsg_type;
1774 c.seq = nlh->nlmsg_seq;
1775 c.pid = nlh->nlmsg_pid;
1776 c.data.aevent = XFRM_AE_CU;
1777 km_state_notify(x, &c);
1778 err = 0;
1779 out:
1780 xfrm_state_put(x);
1781 return err;
1782 }
1783
1784 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1785 struct nlattr **attrs)
1786 {
1787 struct net *net = sock_net(skb->sk);
1788 struct km_event c;
1789 u8 type = XFRM_POLICY_TYPE_MAIN;
1790 int err;
1791 struct xfrm_audit audit_info;
1792
1793 err = copy_from_user_policy_type(&type, attrs);
1794 if (err)
1795 return err;
1796
1797 audit_info.loginuid = audit_get_loginuid(current);
1798 audit_info.sessionid = audit_get_sessionid(current);
1799 security_task_getsecid(current, &audit_info.secid);
1800 err = xfrm_policy_flush(net, type, &audit_info);
1801 if (err) {
1802 if (err == -ESRCH) /* empty table */
1803 return 0;
1804 return err;
1805 }
1806
1807 c.data.type = type;
1808 c.event = nlh->nlmsg_type;
1809 c.seq = nlh->nlmsg_seq;
1810 c.pid = nlh->nlmsg_pid;
1811 c.net = net;
1812 km_policy_notify(NULL, 0, &c);
1813 return 0;
1814 }
1815
1816 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1817 struct nlattr **attrs)
1818 {
1819 struct net *net = sock_net(skb->sk);
1820 struct xfrm_policy *xp;
1821 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1822 struct xfrm_userpolicy_info *p = &up->pol;
1823 u8 type = XFRM_POLICY_TYPE_MAIN;
1824 int err = -ENOENT;
1825 struct xfrm_mark m;
1826 u32 mark = xfrm_mark_get(attrs, &m);
1827
1828 err = copy_from_user_policy_type(&type, attrs);
1829 if (err)
1830 return err;
1831
1832 err = verify_policy_dir(p->dir);
1833 if (err)
1834 return err;
1835
1836 if (p->index)
1837 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1838 else {
1839 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1840 struct xfrm_sec_ctx *ctx;
1841
1842 err = verify_sec_ctx_len(attrs);
1843 if (err)
1844 return err;
1845
1846 ctx = NULL;
1847 if (rt) {
1848 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1849
1850 err = security_xfrm_policy_alloc(&ctx, uctx);
1851 if (err)
1852 return err;
1853 }
1854 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1855 &p->sel, ctx, 0, &err);
1856 security_xfrm_policy_free(ctx);
1857 }
1858 if (xp == NULL)
1859 return -ENOENT;
1860
1861 if (unlikely(xp->walk.dead))
1862 goto out;
1863
1864 err = 0;
1865 if (up->hard) {
1866 uid_t loginuid = audit_get_loginuid(current);
1867 u32 sessionid = audit_get_sessionid(current);
1868 u32 sid;
1869
1870 security_task_getsecid(current, &sid);
1871 xfrm_policy_delete(xp, p->dir);
1872 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1873
1874 } else {
1875 // reset the timers here?
1876 WARN(1, "Dont know what to do with soft policy expire\n");
1877 }
1878 km_policy_expired(xp, p->dir, up->hard, current->pid);
1879
1880 out:
1881 xfrm_pol_put(xp);
1882 return err;
1883 }
1884
1885 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1886 struct nlattr **attrs)
1887 {
1888 struct net *net = sock_net(skb->sk);
1889 struct xfrm_state *x;
1890 int err;
1891 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1892 struct xfrm_usersa_info *p = &ue->state;
1893 struct xfrm_mark m;
1894 u32 mark = xfrm_mark_get(attrs, &m);
1895
1896 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1897
1898 err = -ENOENT;
1899 if (x == NULL)
1900 return err;
1901
1902 spin_lock_bh(&x->lock);
1903 err = -EINVAL;
1904 if (x->km.state != XFRM_STATE_VALID)
1905 goto out;
1906 km_state_expired(x, ue->hard, current->pid);
1907
1908 if (ue->hard) {
1909 uid_t loginuid = audit_get_loginuid(current);
1910 u32 sessionid = audit_get_sessionid(current);
1911 u32 sid;
1912
1913 security_task_getsecid(current, &sid);
1914 __xfrm_state_delete(x);
1915 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1916 }
1917 err = 0;
1918 out:
1919 spin_unlock_bh(&x->lock);
1920 xfrm_state_put(x);
1921 return err;
1922 }
1923
1924 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1925 struct nlattr **attrs)
1926 {
1927 struct net *net = sock_net(skb->sk);
1928 struct xfrm_policy *xp;
1929 struct xfrm_user_tmpl *ut;
1930 int i;
1931 struct nlattr *rt = attrs[XFRMA_TMPL];
1932 struct xfrm_mark mark;
1933
1934 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1935 struct xfrm_state *x = xfrm_state_alloc(net);
1936 int err = -ENOMEM;
1937
1938 if (!x)
1939 goto nomem;
1940
1941 xfrm_mark_get(attrs, &mark);
1942
1943 err = verify_newpolicy_info(&ua->policy);
1944 if (err)
1945 goto bad_policy;
1946
1947 /* build an XP */
1948 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
1949 if (!xp)
1950 goto free_state;
1951
1952 memcpy(&x->id, &ua->id, sizeof(ua->id));
1953 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1954 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1955 xp->mark.m = x->mark.m = mark.m;
1956 xp->mark.v = x->mark.v = mark.v;
1957 ut = nla_data(rt);
1958 /* extract the templates and for each call km_key */
1959 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1960 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1961 memcpy(&x->id, &t->id, sizeof(x->id));
1962 x->props.mode = t->mode;
1963 x->props.reqid = t->reqid;
1964 x->props.family = ut->family;
1965 t->aalgos = ua->aalgos;
1966 t->ealgos = ua->ealgos;
1967 t->calgos = ua->calgos;
1968 err = km_query(x, t, xp);
1969
1970 }
1971
1972 kfree(x);
1973 kfree(xp);
1974
1975 return 0;
1976
1977 bad_policy:
1978 WARN(1, "BAD policy passed\n");
1979 free_state:
1980 kfree(x);
1981 nomem:
1982 return err;
1983 }
1984
1985 #ifdef CONFIG_XFRM_MIGRATE
1986 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1987 struct xfrm_kmaddress *k,
1988 struct nlattr **attrs, int *num)
1989 {
1990 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1991 struct xfrm_user_migrate *um;
1992 int i, num_migrate;
1993
1994 if (k != NULL) {
1995 struct xfrm_user_kmaddress *uk;
1996
1997 uk = nla_data(attrs[XFRMA_KMADDRESS]);
1998 memcpy(&k->local, &uk->local, sizeof(k->local));
1999 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2000 k->family = uk->family;
2001 k->reserved = uk->reserved;
2002 }
2003
2004 um = nla_data(rt);
2005 num_migrate = nla_len(rt) / sizeof(*um);
2006
2007 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2008 return -EINVAL;
2009
2010 for (i = 0; i < num_migrate; i++, um++, ma++) {
2011 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2012 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2013 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2014 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2015
2016 ma->proto = um->proto;
2017 ma->mode = um->mode;
2018 ma->reqid = um->reqid;
2019
2020 ma->old_family = um->old_family;
2021 ma->new_family = um->new_family;
2022 }
2023
2024 *num = i;
2025 return 0;
2026 }
2027
2028 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2029 struct nlattr **attrs)
2030 {
2031 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2032 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2033 struct xfrm_kmaddress km, *kmp;
2034 u8 type;
2035 int err;
2036 int n = 0;
2037
2038 if (attrs[XFRMA_MIGRATE] == NULL)
2039 return -EINVAL;
2040
2041 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2042
2043 err = copy_from_user_policy_type(&type, attrs);
2044 if (err)
2045 return err;
2046
2047 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2048 if (err)
2049 return err;
2050
2051 if (!n)
2052 return 0;
2053
2054 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2055
2056 return 0;
2057 }
2058 #else
2059 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2060 struct nlattr **attrs)
2061 {
2062 return -ENOPROTOOPT;
2063 }
2064 #endif
2065
2066 #ifdef CONFIG_XFRM_MIGRATE
2067 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2068 {
2069 struct xfrm_user_migrate um;
2070
2071 memset(&um, 0, sizeof(um));
2072 um.proto = m->proto;
2073 um.mode = m->mode;
2074 um.reqid = m->reqid;
2075 um.old_family = m->old_family;
2076 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2077 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2078 um.new_family = m->new_family;
2079 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2080 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2081
2082 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2083 }
2084
2085 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2086 {
2087 struct xfrm_user_kmaddress uk;
2088
2089 memset(&uk, 0, sizeof(uk));
2090 uk.family = k->family;
2091 uk.reserved = k->reserved;
2092 memcpy(&uk.local, &k->local, sizeof(uk.local));
2093 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2094
2095 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2096 }
2097
2098 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2099 {
2100 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2101 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2102 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2103 + userpolicy_type_attrsize();
2104 }
2105
2106 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2107 int num_migrate, const struct xfrm_kmaddress *k,
2108 const struct xfrm_selector *sel, u8 dir, u8 type)
2109 {
2110 const struct xfrm_migrate *mp;
2111 struct xfrm_userpolicy_id *pol_id;
2112 struct nlmsghdr *nlh;
2113 int i;
2114
2115 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2116 if (nlh == NULL)
2117 return -EMSGSIZE;
2118
2119 pol_id = nlmsg_data(nlh);
2120 /* copy data from selector, dir, and type to the pol_id */
2121 memset(pol_id, 0, sizeof(*pol_id));
2122 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2123 pol_id->dir = dir;
2124
2125 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
2126 goto nlmsg_failure;
2127
2128 if (copy_to_user_policy_type(type, skb) < 0)
2129 goto nlmsg_failure;
2130
2131 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2132 if (copy_to_user_migrate(mp, skb) < 0)
2133 goto nlmsg_failure;
2134 }
2135
2136 return nlmsg_end(skb, nlh);
2137 nlmsg_failure:
2138 nlmsg_cancel(skb, nlh);
2139 return -EMSGSIZE;
2140 }
2141
2142 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2143 const struct xfrm_migrate *m, int num_migrate,
2144 const struct xfrm_kmaddress *k)
2145 {
2146 struct net *net = &init_net;
2147 struct sk_buff *skb;
2148
2149 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2150 if (skb == NULL)
2151 return -ENOMEM;
2152
2153 /* build migrate */
2154 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2155 BUG();
2156
2157 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2158 }
2159 #else
2160 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2161 const struct xfrm_migrate *m, int num_migrate,
2162 const struct xfrm_kmaddress *k)
2163 {
2164 return -ENOPROTOOPT;
2165 }
2166 #endif
2167
2168 #define XMSGSIZE(type) sizeof(struct type)
2169
2170 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2171 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2172 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2173 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2174 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2175 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2176 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2177 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2178 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2179 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2180 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2181 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2182 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2183 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2184 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2185 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2186 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2187 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2188 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2189 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2190 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2191 };
2192
2193 #undef XMSGSIZE
2194
2195 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2196 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2197 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2198 [XFRMA_LASTUSED] = { .type = NLA_U64},
2199 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2200 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2201 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2202 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2203 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2204 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2205 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2206 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2207 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2208 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2209 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2210 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2211 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2212 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2213 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2214 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2215 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2216 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2217 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2218 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2219 };
2220
2221 static struct xfrm_link {
2222 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2223 int (*dump)(struct sk_buff *, struct netlink_callback *);
2224 int (*done)(struct netlink_callback *);
2225 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2226 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2227 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2228 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2229 .dump = xfrm_dump_sa,
2230 .done = xfrm_dump_sa_done },
2231 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2232 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2233 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2234 .dump = xfrm_dump_policy,
2235 .done = xfrm_dump_policy_done },
2236 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2237 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2238 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2239 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2240 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2241 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2242 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2243 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2244 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2245 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2246 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2247 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2248 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2249 };
2250
2251 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2252 {
2253 struct net *net = sock_net(skb->sk);
2254 struct nlattr *attrs[XFRMA_MAX+1];
2255 struct xfrm_link *link;
2256 int type, err;
2257
2258 type = nlh->nlmsg_type;
2259 if (type > XFRM_MSG_MAX)
2260 return -EINVAL;
2261
2262 type -= XFRM_MSG_BASE;
2263 link = &xfrm_dispatch[type];
2264
2265 /* All operations require privileges, even GET */
2266 if (security_netlink_recv(skb, CAP_NET_ADMIN))
2267 return -EPERM;
2268
2269 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2270 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2271 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2272 if (link->dump == NULL)
2273 return -EINVAL;
2274
2275 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done);
2276 }
2277
2278 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2279 xfrma_policy);
2280 if (err < 0)
2281 return err;
2282
2283 if (link->doit == NULL)
2284 return -EINVAL;
2285
2286 return link->doit(skb, nlh, attrs);
2287 }
2288
2289 static void xfrm_netlink_rcv(struct sk_buff *skb)
2290 {
2291 mutex_lock(&xfrm_cfg_mutex);
2292 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2293 mutex_unlock(&xfrm_cfg_mutex);
2294 }
2295
2296 static inline size_t xfrm_expire_msgsize(void)
2297 {
2298 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2299 + nla_total_size(sizeof(struct xfrm_mark));
2300 }
2301
2302 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2303 {
2304 struct xfrm_user_expire *ue;
2305 struct nlmsghdr *nlh;
2306
2307 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2308 if (nlh == NULL)
2309 return -EMSGSIZE;
2310
2311 ue = nlmsg_data(nlh);
2312 copy_to_user_state(x, &ue->state);
2313 ue->hard = (c->data.hard != 0) ? 1 : 0;
2314
2315 if (xfrm_mark_put(skb, &x->mark))
2316 goto nla_put_failure;
2317
2318 return nlmsg_end(skb, nlh);
2319
2320 nla_put_failure:
2321 return -EMSGSIZE;
2322 }
2323
2324 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2325 {
2326 struct net *net = xs_net(x);
2327 struct sk_buff *skb;
2328
2329 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2330 if (skb == NULL)
2331 return -ENOMEM;
2332
2333 if (build_expire(skb, x, c) < 0) {
2334 kfree_skb(skb);
2335 return -EMSGSIZE;
2336 }
2337
2338 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2339 }
2340
2341 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2342 {
2343 struct net *net = xs_net(x);
2344 struct sk_buff *skb;
2345
2346 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2347 if (skb == NULL)
2348 return -ENOMEM;
2349
2350 if (build_aevent(skb, x, c) < 0)
2351 BUG();
2352
2353 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2354 }
2355
2356 static int xfrm_notify_sa_flush(const struct km_event *c)
2357 {
2358 struct net *net = c->net;
2359 struct xfrm_usersa_flush *p;
2360 struct nlmsghdr *nlh;
2361 struct sk_buff *skb;
2362 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2363
2364 skb = nlmsg_new(len, GFP_ATOMIC);
2365 if (skb == NULL)
2366 return -ENOMEM;
2367
2368 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2369 if (nlh == NULL) {
2370 kfree_skb(skb);
2371 return -EMSGSIZE;
2372 }
2373
2374 p = nlmsg_data(nlh);
2375 p->proto = c->data.proto;
2376
2377 nlmsg_end(skb, nlh);
2378
2379 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2380 }
2381
2382 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2383 {
2384 size_t l = 0;
2385 if (x->aead)
2386 l += nla_total_size(aead_len(x->aead));
2387 if (x->aalg) {
2388 l += nla_total_size(sizeof(struct xfrm_algo) +
2389 (x->aalg->alg_key_len + 7) / 8);
2390 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2391 }
2392 if (x->ealg)
2393 l += nla_total_size(xfrm_alg_len(x->ealg));
2394 if (x->calg)
2395 l += nla_total_size(sizeof(*x->calg));
2396 if (x->encap)
2397 l += nla_total_size(sizeof(*x->encap));
2398 if (x->tfcpad)
2399 l += nla_total_size(sizeof(x->tfcpad));
2400 if (x->replay_esn)
2401 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2402 if (x->security)
2403 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2404 x->security->ctx_len);
2405 if (x->coaddr)
2406 l += nla_total_size(sizeof(*x->coaddr));
2407
2408 /* Must count x->lastused as it may become non-zero behind our back. */
2409 l += nla_total_size(sizeof(u64));
2410
2411 return l;
2412 }
2413
2414 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2415 {
2416 struct net *net = xs_net(x);
2417 struct xfrm_usersa_info *p;
2418 struct xfrm_usersa_id *id;
2419 struct nlmsghdr *nlh;
2420 struct sk_buff *skb;
2421 int len = xfrm_sa_len(x);
2422 int headlen;
2423
2424 headlen = sizeof(*p);
2425 if (c->event == XFRM_MSG_DELSA) {
2426 len += nla_total_size(headlen);
2427 headlen = sizeof(*id);
2428 len += nla_total_size(sizeof(struct xfrm_mark));
2429 }
2430 len += NLMSG_ALIGN(headlen);
2431
2432 skb = nlmsg_new(len, GFP_ATOMIC);
2433 if (skb == NULL)
2434 return -ENOMEM;
2435
2436 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2437 if (nlh == NULL)
2438 goto nla_put_failure;
2439
2440 p = nlmsg_data(nlh);
2441 if (c->event == XFRM_MSG_DELSA) {
2442 struct nlattr *attr;
2443
2444 id = nlmsg_data(nlh);
2445 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2446 id->spi = x->id.spi;
2447 id->family = x->props.family;
2448 id->proto = x->id.proto;
2449
2450 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2451 if (attr == NULL)
2452 goto nla_put_failure;
2453
2454 p = nla_data(attr);
2455 }
2456
2457 if (copy_to_user_state_extra(x, p, skb))
2458 goto nla_put_failure;
2459
2460 nlmsg_end(skb, nlh);
2461
2462 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2463
2464 nla_put_failure:
2465 /* Somebody screwed up with xfrm_sa_len! */
2466 WARN_ON(1);
2467 kfree_skb(skb);
2468 return -1;
2469 }
2470
2471 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2472 {
2473
2474 switch (c->event) {
2475 case XFRM_MSG_EXPIRE:
2476 return xfrm_exp_state_notify(x, c);
2477 case XFRM_MSG_NEWAE:
2478 return xfrm_aevent_state_notify(x, c);
2479 case XFRM_MSG_DELSA:
2480 case XFRM_MSG_UPDSA:
2481 case XFRM_MSG_NEWSA:
2482 return xfrm_notify_sa(x, c);
2483 case XFRM_MSG_FLUSHSA:
2484 return xfrm_notify_sa_flush(c);
2485 default:
2486 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2487 c->event);
2488 break;
2489 }
2490
2491 return 0;
2492
2493 }
2494
2495 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2496 struct xfrm_policy *xp)
2497 {
2498 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2499 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2500 + nla_total_size(sizeof(struct xfrm_mark))
2501 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2502 + userpolicy_type_attrsize();
2503 }
2504
2505 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2506 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2507 int dir)
2508 {
2509 struct xfrm_user_acquire *ua;
2510 struct nlmsghdr *nlh;
2511 __u32 seq = xfrm_get_acqseq();
2512
2513 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2514 if (nlh == NULL)
2515 return -EMSGSIZE;
2516
2517 ua = nlmsg_data(nlh);
2518 memcpy(&ua->id, &x->id, sizeof(ua->id));
2519 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2520 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2521 copy_to_user_policy(xp, &ua->policy, dir);
2522 ua->aalgos = xt->aalgos;
2523 ua->ealgos = xt->ealgos;
2524 ua->calgos = xt->calgos;
2525 ua->seq = x->km.seq = seq;
2526
2527 if (copy_to_user_tmpl(xp, skb) < 0)
2528 goto nlmsg_failure;
2529 if (copy_to_user_state_sec_ctx(x, skb))
2530 goto nlmsg_failure;
2531 if (copy_to_user_policy_type(xp->type, skb) < 0)
2532 goto nlmsg_failure;
2533 if (xfrm_mark_put(skb, &xp->mark))
2534 goto nla_put_failure;
2535
2536 return nlmsg_end(skb, nlh);
2537
2538 nla_put_failure:
2539 nlmsg_failure:
2540 nlmsg_cancel(skb, nlh);
2541 return -EMSGSIZE;
2542 }
2543
2544 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2545 struct xfrm_policy *xp, int dir)
2546 {
2547 struct net *net = xs_net(x);
2548 struct sk_buff *skb;
2549
2550 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2551 if (skb == NULL)
2552 return -ENOMEM;
2553
2554 if (build_acquire(skb, x, xt, xp, dir) < 0)
2555 BUG();
2556
2557 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2558 }
2559
2560 /* User gives us xfrm_user_policy_info followed by an array of 0
2561 * or more templates.
2562 */
2563 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2564 u8 *data, int len, int *dir)
2565 {
2566 struct net *net = sock_net(sk);
2567 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2568 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2569 struct xfrm_policy *xp;
2570 int nr;
2571
2572 switch (sk->sk_family) {
2573 case AF_INET:
2574 if (opt != IP_XFRM_POLICY) {
2575 *dir = -EOPNOTSUPP;
2576 return NULL;
2577 }
2578 break;
2579 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2580 case AF_INET6:
2581 if (opt != IPV6_XFRM_POLICY) {
2582 *dir = -EOPNOTSUPP;
2583 return NULL;
2584 }
2585 break;
2586 #endif
2587 default:
2588 *dir = -EINVAL;
2589 return NULL;
2590 }
2591
2592 *dir = -EINVAL;
2593
2594 if (len < sizeof(*p) ||
2595 verify_newpolicy_info(p))
2596 return NULL;
2597
2598 nr = ((len - sizeof(*p)) / sizeof(*ut));
2599 if (validate_tmpl(nr, ut, p->sel.family))
2600 return NULL;
2601
2602 if (p->dir > XFRM_POLICY_OUT)
2603 return NULL;
2604
2605 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2606 if (xp == NULL) {
2607 *dir = -ENOBUFS;
2608 return NULL;
2609 }
2610
2611 copy_from_user_policy(xp, p);
2612 xp->type = XFRM_POLICY_TYPE_MAIN;
2613 copy_templates(xp, ut, nr);
2614
2615 *dir = p->dir;
2616
2617 return xp;
2618 }
2619
2620 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2621 {
2622 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2623 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2624 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2625 + nla_total_size(sizeof(struct xfrm_mark))
2626 + userpolicy_type_attrsize();
2627 }
2628
2629 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2630 int dir, const struct km_event *c)
2631 {
2632 struct xfrm_user_polexpire *upe;
2633 struct nlmsghdr *nlh;
2634 int hard = c->data.hard;
2635
2636 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2637 if (nlh == NULL)
2638 return -EMSGSIZE;
2639
2640 upe = nlmsg_data(nlh);
2641 copy_to_user_policy(xp, &upe->pol, dir);
2642 if (copy_to_user_tmpl(xp, skb) < 0)
2643 goto nlmsg_failure;
2644 if (copy_to_user_sec_ctx(xp, skb))
2645 goto nlmsg_failure;
2646 if (copy_to_user_policy_type(xp->type, skb) < 0)
2647 goto nlmsg_failure;
2648 if (xfrm_mark_put(skb, &xp->mark))
2649 goto nla_put_failure;
2650 upe->hard = !!hard;
2651
2652 return nlmsg_end(skb, nlh);
2653
2654 nla_put_failure:
2655 nlmsg_failure:
2656 nlmsg_cancel(skb, nlh);
2657 return -EMSGSIZE;
2658 }
2659
2660 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2661 {
2662 struct net *net = xp_net(xp);
2663 struct sk_buff *skb;
2664
2665 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2666 if (skb == NULL)
2667 return -ENOMEM;
2668
2669 if (build_polexpire(skb, xp, dir, c) < 0)
2670 BUG();
2671
2672 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2673 }
2674
2675 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2676 {
2677 struct net *net = xp_net(xp);
2678 struct xfrm_userpolicy_info *p;
2679 struct xfrm_userpolicy_id *id;
2680 struct nlmsghdr *nlh;
2681 struct sk_buff *skb;
2682 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2683 int headlen;
2684
2685 headlen = sizeof(*p);
2686 if (c->event == XFRM_MSG_DELPOLICY) {
2687 len += nla_total_size(headlen);
2688 headlen = sizeof(*id);
2689 }
2690 len += userpolicy_type_attrsize();
2691 len += nla_total_size(sizeof(struct xfrm_mark));
2692 len += NLMSG_ALIGN(headlen);
2693
2694 skb = nlmsg_new(len, GFP_ATOMIC);
2695 if (skb == NULL)
2696 return -ENOMEM;
2697
2698 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2699 if (nlh == NULL)
2700 goto nlmsg_failure;
2701
2702 p = nlmsg_data(nlh);
2703 if (c->event == XFRM_MSG_DELPOLICY) {
2704 struct nlattr *attr;
2705
2706 id = nlmsg_data(nlh);
2707 memset(id, 0, sizeof(*id));
2708 id->dir = dir;
2709 if (c->data.byid)
2710 id->index = xp->index;
2711 else
2712 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2713
2714 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2715 if (attr == NULL)
2716 goto nlmsg_failure;
2717
2718 p = nla_data(attr);
2719 }
2720
2721 copy_to_user_policy(xp, p, dir);
2722 if (copy_to_user_tmpl(xp, skb) < 0)
2723 goto nlmsg_failure;
2724 if (copy_to_user_policy_type(xp->type, skb) < 0)
2725 goto nlmsg_failure;
2726
2727 if (xfrm_mark_put(skb, &xp->mark))
2728 goto nla_put_failure;
2729
2730 nlmsg_end(skb, nlh);
2731
2732 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2733
2734 nla_put_failure:
2735 nlmsg_failure:
2736 kfree_skb(skb);
2737 return -1;
2738 }
2739
2740 static int xfrm_notify_policy_flush(const struct km_event *c)
2741 {
2742 struct net *net = c->net;
2743 struct nlmsghdr *nlh;
2744 struct sk_buff *skb;
2745
2746 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2747 if (skb == NULL)
2748 return -ENOMEM;
2749
2750 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2751 if (nlh == NULL)
2752 goto nlmsg_failure;
2753 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2754 goto nlmsg_failure;
2755
2756 nlmsg_end(skb, nlh);
2757
2758 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2759
2760 nlmsg_failure:
2761 kfree_skb(skb);
2762 return -1;
2763 }
2764
2765 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2766 {
2767
2768 switch (c->event) {
2769 case XFRM_MSG_NEWPOLICY:
2770 case XFRM_MSG_UPDPOLICY:
2771 case XFRM_MSG_DELPOLICY:
2772 return xfrm_notify_policy(xp, dir, c);
2773 case XFRM_MSG_FLUSHPOLICY:
2774 return xfrm_notify_policy_flush(c);
2775 case XFRM_MSG_POLEXPIRE:
2776 return xfrm_exp_policy_notify(xp, dir, c);
2777 default:
2778 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2779 c->event);
2780 }
2781
2782 return 0;
2783
2784 }
2785
2786 static inline size_t xfrm_report_msgsize(void)
2787 {
2788 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2789 }
2790
2791 static int build_report(struct sk_buff *skb, u8 proto,
2792 struct xfrm_selector *sel, xfrm_address_t *addr)
2793 {
2794 struct xfrm_user_report *ur;
2795 struct nlmsghdr *nlh;
2796
2797 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2798 if (nlh == NULL)
2799 return -EMSGSIZE;
2800
2801 ur = nlmsg_data(nlh);
2802 ur->proto = proto;
2803 memcpy(&ur->sel, sel, sizeof(ur->sel));
2804
2805 if (addr)
2806 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2807
2808 return nlmsg_end(skb, nlh);
2809
2810 nla_put_failure:
2811 nlmsg_cancel(skb, nlh);
2812 return -EMSGSIZE;
2813 }
2814
2815 static int xfrm_send_report(struct net *net, u8 proto,
2816 struct xfrm_selector *sel, xfrm_address_t *addr)
2817 {
2818 struct sk_buff *skb;
2819
2820 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2821 if (skb == NULL)
2822 return -ENOMEM;
2823
2824 if (build_report(skb, proto, sel, addr) < 0)
2825 BUG();
2826
2827 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2828 }
2829
2830 static inline size_t xfrm_mapping_msgsize(void)
2831 {
2832 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2833 }
2834
2835 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2836 xfrm_address_t *new_saddr, __be16 new_sport)
2837 {
2838 struct xfrm_user_mapping *um;
2839 struct nlmsghdr *nlh;
2840
2841 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2842 if (nlh == NULL)
2843 return -EMSGSIZE;
2844
2845 um = nlmsg_data(nlh);
2846
2847 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2848 um->id.spi = x->id.spi;
2849 um->id.family = x->props.family;
2850 um->id.proto = x->id.proto;
2851 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2852 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2853 um->new_sport = new_sport;
2854 um->old_sport = x->encap->encap_sport;
2855 um->reqid = x->props.reqid;
2856
2857 return nlmsg_end(skb, nlh);
2858 }
2859
2860 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2861 __be16 sport)
2862 {
2863 struct net *net = xs_net(x);
2864 struct sk_buff *skb;
2865
2866 if (x->id.proto != IPPROTO_ESP)
2867 return -EINVAL;
2868
2869 if (!x->encap)
2870 return -EINVAL;
2871
2872 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2873 if (skb == NULL)
2874 return -ENOMEM;
2875
2876 if (build_mapping(skb, x, ipaddr, sport) < 0)
2877 BUG();
2878
2879 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2880 }
2881
2882 static struct xfrm_mgr netlink_mgr = {
2883 .id = "netlink",
2884 .notify = xfrm_send_state_notify,
2885 .acquire = xfrm_send_acquire,
2886 .compile_policy = xfrm_compile_policy,
2887 .notify_policy = xfrm_send_policy_notify,
2888 .report = xfrm_send_report,
2889 .migrate = xfrm_send_migrate,
2890 .new_mapping = xfrm_send_mapping,
2891 };
2892
2893 static int __net_init xfrm_user_net_init(struct net *net)
2894 {
2895 struct sock *nlsk;
2896
2897 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
2898 xfrm_netlink_rcv, NULL, THIS_MODULE);
2899 if (nlsk == NULL)
2900 return -ENOMEM;
2901 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2902 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2903 return 0;
2904 }
2905
2906 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2907 {
2908 struct net *net;
2909 list_for_each_entry(net, net_exit_list, exit_list)
2910 rcu_assign_pointer(net->xfrm.nlsk, NULL);
2911 synchronize_net();
2912 list_for_each_entry(net, net_exit_list, exit_list)
2913 netlink_kernel_release(net->xfrm.nlsk_stash);
2914 }
2915
2916 static struct pernet_operations xfrm_user_net_ops = {
2917 .init = xfrm_user_net_init,
2918 .exit_batch = xfrm_user_net_exit,
2919 };
2920
2921 static int __init xfrm_user_init(void)
2922 {
2923 int rv;
2924
2925 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2926
2927 rv = register_pernet_subsys(&xfrm_user_net_ops);
2928 if (rv < 0)
2929 return rv;
2930 rv = xfrm_register_km(&netlink_mgr);
2931 if (rv < 0)
2932 unregister_pernet_subsys(&xfrm_user_net_ops);
2933 return rv;
2934 }
2935
2936 static void __exit xfrm_user_exit(void)
2937 {
2938 xfrm_unregister_km(&netlink_mgr);
2939 unregister_pernet_subsys(&xfrm_user_net_ops);
2940 }
2941
2942 module_init(xfrm_user_init);
2943 module_exit(xfrm_user_exit);
2944 MODULE_LICENSE("GPL");
2945 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2946
CRIS linux kernel tree