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[PATCH] aic7xxx_osm build fix
[cris-mirror.git] / net / xfrm / xfrm_user.c
blob97509011c274c7c0f1c698acc24fed817f861a2d
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/module.h>
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/socket.h>
18 #include <linux/string.h>
19 #include <linux/net.h>
20 #include <linux/skbuff.h>
21 #include <linux/netlink.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/pfkeyv2.h>
24 #include <linux/ipsec.h>
25 #include <linux/init.h>
26 #include <linux/security.h>
27 #include <net/sock.h>
28 #include <net/xfrm.h>
29 #include <asm/uaccess.h>
30
31 static struct sock *xfrm_nl;
32
33 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
34 {
35 struct rtattr *rt = xfrma[type - 1];
36 struct xfrm_algo *algp;
37 int len;
38
39 if (!rt)
40 return 0;
41
42 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
43 if (len < 0)
44 return -EINVAL;
45
46 algp = RTA_DATA(rt);
47
48 len -= (algp->alg_key_len + 7U) / 8;
49 if (len < 0)
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 if (!algp->alg_key_len &&
55 strcmp(algp->alg_name, "digest_null") != 0)
56 return -EINVAL;
57 break;
58
59 case XFRMA_ALG_CRYPT:
60 if (!algp->alg_key_len &&
61 strcmp(algp->alg_name, "cipher_null") != 0)
62 return -EINVAL;
63 break;
64
65 case XFRMA_ALG_COMP:
66 /* Zero length keys are legal. */
67 break;
68
69 default:
70 return -EINVAL;
71 };
72
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 return 0;
75 }
76
77 static int verify_encap_tmpl(struct rtattr **xfrma)
78 {
79 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
80 struct xfrm_encap_tmpl *encap;
81
82 if (!rt)
83 return 0;
84
85 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
86 return -EINVAL;
87
88 return 0;
89 }
90
91 static int verify_newsa_info(struct xfrm_usersa_info *p,
92 struct rtattr **xfrma)
93 {
94 int err;
95
96 err = -EINVAL;
97 switch (p->family) {
98 case AF_INET:
99 break;
100
101 case AF_INET6:
102 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
103 break;
104 #else
105 err = -EAFNOSUPPORT;
106 goto out;
107 #endif
108
109 default:
110 goto out;
111 };
112
113 err = -EINVAL;
114 switch (p->id.proto) {
115 case IPPROTO_AH:
116 if (!xfrma[XFRMA_ALG_AUTH-1] ||
117 xfrma[XFRMA_ALG_CRYPT-1] ||
118 xfrma[XFRMA_ALG_COMP-1])
119 goto out;
120 break;
121
122 case IPPROTO_ESP:
123 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
124 !xfrma[XFRMA_ALG_CRYPT-1]) ||
125 xfrma[XFRMA_ALG_COMP-1])
126 goto out;
127 break;
128
129 case IPPROTO_COMP:
130 if (!xfrma[XFRMA_ALG_COMP-1] ||
131 xfrma[XFRMA_ALG_AUTH-1] ||
132 xfrma[XFRMA_ALG_CRYPT-1])
133 goto out;
134 break;
135
136 default:
137 goto out;
138 };
139
140 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
141 goto out;
142 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
143 goto out;
144 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
145 goto out;
146 if ((err = verify_encap_tmpl(xfrma)))
147 goto out;
148
149 err = -EINVAL;
150 switch (p->mode) {
151 case 0:
152 case 1:
153 break;
154
155 default:
156 goto out;
157 };
158
159 err = 0;
160
161 out:
162 return err;
163 }
164
165 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
166 struct xfrm_algo_desc *(*get_byname)(char *, int),
167 struct rtattr *u_arg)
168 {
169 struct rtattr *rta = u_arg;
170 struct xfrm_algo *p, *ualg;
171 struct xfrm_algo_desc *algo;
172 int len;
173
174 if (!rta)
175 return 0;
176
177 ualg = RTA_DATA(rta);
178
179 algo = get_byname(ualg->alg_name, 1);
180 if (!algo)
181 return -ENOSYS;
182 *props = algo->desc.sadb_alg_id;
183
184 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
185 p = kmalloc(len, GFP_KERNEL);
186 if (!p)
187 return -ENOMEM;
188
189 memcpy(p, ualg, len);
190 *algpp = p;
191 return 0;
192 }
193
194 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
195 {
196 struct rtattr *rta = u_arg;
197 struct xfrm_encap_tmpl *p, *uencap;
198
199 if (!rta)
200 return 0;
201
202 uencap = RTA_DATA(rta);
203 p = kmalloc(sizeof(*p), GFP_KERNEL);
204 if (!p)
205 return -ENOMEM;
206
207 memcpy(p, uencap, sizeof(*p));
208 *encapp = p;
209 return 0;
210 }
211
212 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
213 {
214 memcpy(&x->id, &p->id, sizeof(x->id));
215 memcpy(&x->sel, &p->sel, sizeof(x->sel));
216 memcpy(&x->lft, &p->lft, sizeof(x->lft));
217 x->props.mode = p->mode;
218 x->props.replay_window = p->replay_window;
219 x->props.reqid = p->reqid;
220 x->props.family = p->family;
221 x->props.saddr = p->saddr;
222 x->props.flags = p->flags;
223 }
224
225 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
226 struct rtattr **xfrma,
227 int *errp)
228 {
229 struct xfrm_state *x = xfrm_state_alloc();
230 int err = -ENOMEM;
231
232 if (!x)
233 goto error_no_put;
234
235 copy_from_user_state(x, p);
236
237 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
238 xfrm_aalg_get_byname,
239 xfrma[XFRMA_ALG_AUTH-1])))
240 goto error;
241 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
242 xfrm_ealg_get_byname,
243 xfrma[XFRMA_ALG_CRYPT-1])))
244 goto error;
245 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
246 xfrm_calg_get_byname,
247 xfrma[XFRMA_ALG_COMP-1])))
248 goto error;
249 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
250 goto error;
251
252 err = -ENOENT;
253 x->type = xfrm_get_type(x->id.proto, x->props.family);
254 if (x->type == NULL)
255 goto error;
256
257 err = x->type->init_state(x, NULL);
258 if (err)
259 goto error;
260
261 x->curlft.add_time = (unsigned long) xtime.tv_sec;
262 x->km.state = XFRM_STATE_VALID;
263 x->km.seq = p->seq;
264
265 return x;
266
267 error:
268 x->km.state = XFRM_STATE_DEAD;
269 xfrm_state_put(x);
270 error_no_put:
271 *errp = err;
272 return NULL;
273 }
274
275 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
276 {
277 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
278 struct xfrm_state *x;
279 int err;
280
281 err = verify_newsa_info(p, (struct rtattr **) xfrma);
282 if (err)
283 return err;
284
285 x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
286 if (!x)
287 return err;
288
289 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
290 err = xfrm_state_add(x);
291 else
292 err = xfrm_state_update(x);
293
294 if (err < 0) {
295 x->km.state = XFRM_STATE_DEAD;
296 xfrm_state_put(x);
297 }
298
299 return err;
300 }
301
302 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
303 {
304 struct xfrm_state *x;
305 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
306
307 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
308 if (x == NULL)
309 return -ESRCH;
310
311 if (xfrm_state_kern(x)) {
312 xfrm_state_put(x);
313 return -EPERM;
314 }
315
316 xfrm_state_delete(x);
317 xfrm_state_put(x);
318
319 return 0;
320 }
321
322 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
323 {
324 memcpy(&p->id, &x->id, sizeof(p->id));
325 memcpy(&p->sel, &x->sel, sizeof(p->sel));
326 memcpy(&p->lft, &x->lft, sizeof(p->lft));
327 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
328 memcpy(&p->stats, &x->stats, sizeof(p->stats));
329 p->saddr = x->props.saddr;
330 p->mode = x->props.mode;
331 p->replay_window = x->props.replay_window;
332 p->reqid = x->props.reqid;
333 p->family = x->props.family;
334 p->flags = x->props.flags;
335 p->seq = x->km.seq;
336 }
337
338 struct xfrm_dump_info {
339 struct sk_buff *in_skb;
340 struct sk_buff *out_skb;
341 u32 nlmsg_seq;
342 u16 nlmsg_flags;
343 int start_idx;
344 int this_idx;
345 };
346
347 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
348 {
349 struct xfrm_dump_info *sp = ptr;
350 struct sk_buff *in_skb = sp->in_skb;
351 struct sk_buff *skb = sp->out_skb;
352 struct xfrm_usersa_info *p;
353 struct nlmsghdr *nlh;
354 unsigned char *b = skb->tail;
355
356 if (sp->this_idx < sp->start_idx)
357 goto out;
358
359 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
360 sp->nlmsg_seq,
361 XFRM_MSG_NEWSA, sizeof(*p));
362 nlh->nlmsg_flags = sp->nlmsg_flags;
363
364 p = NLMSG_DATA(nlh);
365 copy_to_user_state(x, p);
366
367 if (x->aalg)
368 RTA_PUT(skb, XFRMA_ALG_AUTH,
369 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
370 if (x->ealg)
371 RTA_PUT(skb, XFRMA_ALG_CRYPT,
372 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
373 if (x->calg)
374 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
375
376 if (x->encap)
377 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
378
379 nlh->nlmsg_len = skb->tail - b;
380 out:
381 sp->this_idx++;
382 return 0;
383
384 nlmsg_failure:
385 rtattr_failure:
386 skb_trim(skb, b - skb->data);
387 return -1;
388 }
389
390 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
391 {
392 struct xfrm_dump_info info;
393
394 info.in_skb = cb->skb;
395 info.out_skb = skb;
396 info.nlmsg_seq = cb->nlh->nlmsg_seq;
397 info.nlmsg_flags = NLM_F_MULTI;
398 info.this_idx = 0;
399 info.start_idx = cb->args[0];
400 (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
401 cb->args[0] = info.this_idx;
402
403 return skb->len;
404 }
405
406 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
407 struct xfrm_state *x, u32 seq)
408 {
409 struct xfrm_dump_info info;
410 struct sk_buff *skb;
411
412 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
413 if (!skb)
414 return ERR_PTR(-ENOMEM);
415
416 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
417 info.in_skb = in_skb;
418 info.out_skb = skb;
419 info.nlmsg_seq = seq;
420 info.nlmsg_flags = 0;
421 info.this_idx = info.start_idx = 0;
422
423 if (dump_one_state(x, 0, &info)) {
424 kfree_skb(skb);
425 return NULL;
426 }
427
428 return skb;
429 }
430
431 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
432 {
433 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
434 struct xfrm_state *x;
435 struct sk_buff *resp_skb;
436 int err;
437
438 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
439 err = -ESRCH;
440 if (x == NULL)
441 goto out_noput;
442
443 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
444 if (IS_ERR(resp_skb)) {
445 err = PTR_ERR(resp_skb);
446 } else {
447 err = netlink_unicast(xfrm_nl, resp_skb,
448 NETLINK_CB(skb).pid, MSG_DONTWAIT);
449 }
450 xfrm_state_put(x);
451 out_noput:
452 return err;
453 }
454
455 static int verify_userspi_info(struct xfrm_userspi_info *p)
456 {
457 switch (p->info.id.proto) {
458 case IPPROTO_AH:
459 case IPPROTO_ESP:
460 break;
461
462 case IPPROTO_COMP:
463 /* IPCOMP spi is 16-bits. */
464 if (p->max >= 0x10000)
465 return -EINVAL;
466 break;
467
468 default:
469 return -EINVAL;
470 };
471
472 if (p->min > p->max)
473 return -EINVAL;
474
475 return 0;
476 }
477
478 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
479 {
480 struct xfrm_state *x;
481 struct xfrm_userspi_info *p;
482 struct sk_buff *resp_skb;
483 xfrm_address_t *daddr;
484 int family;
485 int err;
486
487 p = NLMSG_DATA(nlh);
488 err = verify_userspi_info(p);
489 if (err)
490 goto out_noput;
491
492 family = p->info.family;
493 daddr = &p->info.id.daddr;
494
495 x = NULL;
496 if (p->info.seq) {
497 x = xfrm_find_acq_byseq(p->info.seq);
498 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
499 xfrm_state_put(x);
500 x = NULL;
501 }
502 }
503
504 if (!x)
505 x = xfrm_find_acq(p->info.mode, p->info.reqid,
506 p->info.id.proto, daddr,
507 &p->info.saddr, 1,
508 family);
509 err = -ENOENT;
510 if (x == NULL)
511 goto out_noput;
512
513 resp_skb = ERR_PTR(-ENOENT);
514
515 spin_lock_bh(&x->lock);
516 if (x->km.state != XFRM_STATE_DEAD) {
517 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
518 if (x->id.spi)
519 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
520 }
521 spin_unlock_bh(&x->lock);
522
523 if (IS_ERR(resp_skb)) {
524 err = PTR_ERR(resp_skb);
525 goto out;
526 }
527
528 err = netlink_unicast(xfrm_nl, resp_skb,
529 NETLINK_CB(skb).pid, MSG_DONTWAIT);
530
531 out:
532 xfrm_state_put(x);
533 out_noput:
534 return err;
535 }
536
537 static int verify_policy_dir(__u8 dir)
538 {
539 switch (dir) {
540 case XFRM_POLICY_IN:
541 case XFRM_POLICY_OUT:
542 case XFRM_POLICY_FWD:
543 break;
544
545 default:
546 return -EINVAL;
547 };
548
549 return 0;
550 }
551
552 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
553 {
554 switch (p->share) {
555 case XFRM_SHARE_ANY:
556 case XFRM_SHARE_SESSION:
557 case XFRM_SHARE_USER:
558 case XFRM_SHARE_UNIQUE:
559 break;
560
561 default:
562 return -EINVAL;
563 };
564
565 switch (p->action) {
566 case XFRM_POLICY_ALLOW:
567 case XFRM_POLICY_BLOCK:
568 break;
569
570 default:
571 return -EINVAL;
572 };
573
574 switch (p->sel.family) {
575 case AF_INET:
576 break;
577
578 case AF_INET6:
579 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
580 break;
581 #else
582 return -EAFNOSUPPORT;
583 #endif
584
585 default:
586 return -EINVAL;
587 };
588
589 return verify_policy_dir(p->dir);
590 }
591
592 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
593 int nr)
594 {
595 int i;
596
597 xp->xfrm_nr = nr;
598 for (i = 0; i < nr; i++, ut++) {
599 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
600
601 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
602 memcpy(&t->saddr, &ut->saddr,
603 sizeof(xfrm_address_t));
604 t->reqid = ut->reqid;
605 t->mode = ut->mode;
606 t->share = ut->share;
607 t->optional = ut->optional;
608 t->aalgos = ut->aalgos;
609 t->ealgos = ut->ealgos;
610 t->calgos = ut->calgos;
611 }
612 }
613
614 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
615 {
616 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
617 struct xfrm_user_tmpl *utmpl;
618 int nr;
619
620 if (!rt) {
621 pol->xfrm_nr = 0;
622 } else {
623 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
624
625 if (nr > XFRM_MAX_DEPTH)
626 return -EINVAL;
627
628 copy_templates(pol, RTA_DATA(rt), nr);
629 }
630 return 0;
631 }
632
633 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
634 {
635 xp->priority = p->priority;
636 xp->index = p->index;
637 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
638 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
639 xp->action = p->action;
640 xp->flags = p->flags;
641 xp->family = p->sel.family;
642 /* XXX xp->share = p->share; */
643 }
644
645 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
646 {
647 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
648 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
649 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
650 p->priority = xp->priority;
651 p->index = xp->index;
652 p->sel.family = xp->family;
653 p->dir = dir;
654 p->action = xp->action;
655 p->flags = xp->flags;
656 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
657 }
658
659 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
660 {
661 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
662 int err;
663
664 if (!xp) {
665 *errp = -ENOMEM;
666 return NULL;
667 }
668
669 copy_from_user_policy(xp, p);
670 err = copy_from_user_tmpl(xp, xfrma);
671 if (err) {
672 *errp = err;
673 kfree(xp);
674 xp = NULL;
675 }
676
677 return xp;
678 }
679
680 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
681 {
682 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
683 struct xfrm_policy *xp;
684 int err;
685 int excl;
686
687 err = verify_newpolicy_info(p);
688 if (err)
689 return err;
690
691 xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
692 if (!xp)
693 return err;
694
695 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
696 err = xfrm_policy_insert(p->dir, xp, excl);
697 if (err) {
698 kfree(xp);
699 return err;
700 }
701
702 xfrm_pol_put(xp);
703
704 return 0;
705 }
706
707 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
708 {
709 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
710 int i;
711
712 if (xp->xfrm_nr == 0)
713 return 0;
714
715 for (i = 0; i < xp->xfrm_nr; i++) {
716 struct xfrm_user_tmpl *up = &vec[i];
717 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
718
719 memcpy(&up->id, &kp->id, sizeof(up->id));
720 up->family = xp->family;
721 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
722 up->reqid = kp->reqid;
723 up->mode = kp->mode;
724 up->share = kp->share;
725 up->optional = kp->optional;
726 up->aalgos = kp->aalgos;
727 up->ealgos = kp->ealgos;
728 up->calgos = kp->calgos;
729 }
730 RTA_PUT(skb, XFRMA_TMPL,
731 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
732 vec);
733
734 return 0;
735
736 rtattr_failure:
737 return -1;
738 }
739
740 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
741 {
742 struct xfrm_dump_info *sp = ptr;
743 struct xfrm_userpolicy_info *p;
744 struct sk_buff *in_skb = sp->in_skb;
745 struct sk_buff *skb = sp->out_skb;
746 struct nlmsghdr *nlh;
747 unsigned char *b = skb->tail;
748
749 if (sp->this_idx < sp->start_idx)
750 goto out;
751
752 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
753 sp->nlmsg_seq,
754 XFRM_MSG_NEWPOLICY, sizeof(*p));
755 p = NLMSG_DATA(nlh);
756 nlh->nlmsg_flags = sp->nlmsg_flags;
757
758 copy_to_user_policy(xp, p, dir);
759 if (copy_to_user_tmpl(xp, skb) < 0)
760 goto nlmsg_failure;
761
762 nlh->nlmsg_len = skb->tail - b;
763 out:
764 sp->this_idx++;
765 return 0;
766
767 nlmsg_failure:
768 skb_trim(skb, b - skb->data);
769 return -1;
770 }
771
772 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
773 {
774 struct xfrm_dump_info info;
775
776 info.in_skb = cb->skb;
777 info.out_skb = skb;
778 info.nlmsg_seq = cb->nlh->nlmsg_seq;
779 info.nlmsg_flags = NLM_F_MULTI;
780 info.this_idx = 0;
781 info.start_idx = cb->args[0];
782 (void) xfrm_policy_walk(dump_one_policy, &info);
783 cb->args[0] = info.this_idx;
784
785 return skb->len;
786 }
787
788 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
789 struct xfrm_policy *xp,
790 int dir, u32 seq)
791 {
792 struct xfrm_dump_info info;
793 struct sk_buff *skb;
794
795 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
796 if (!skb)
797 return ERR_PTR(-ENOMEM);
798
799 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
800 info.in_skb = in_skb;
801 info.out_skb = skb;
802 info.nlmsg_seq = seq;
803 info.nlmsg_flags = 0;
804 info.this_idx = info.start_idx = 0;
805
806 if (dump_one_policy(xp, dir, 0, &info) < 0) {
807 kfree_skb(skb);
808 return NULL;
809 }
810
811 return skb;
812 }
813
814 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
815 {
816 struct xfrm_policy *xp;
817 struct xfrm_userpolicy_id *p;
818 int err;
819 int delete;
820
821 p = NLMSG_DATA(nlh);
822 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
823
824 err = verify_policy_dir(p->dir);
825 if (err)
826 return err;
827
828 if (p->index)
829 xp = xfrm_policy_byid(p->dir, p->index, delete);
830 else
831 xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
832 if (xp == NULL)
833 return -ENOENT;
834
835 if (!delete) {
836 struct sk_buff *resp_skb;
837
838 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
839 if (IS_ERR(resp_skb)) {
840 err = PTR_ERR(resp_skb);
841 } else {
842 err = netlink_unicast(xfrm_nl, resp_skb,
843 NETLINK_CB(skb).pid,
844 MSG_DONTWAIT);
845 }
846 }
847
848 xfrm_pol_put(xp);
849
850 return err;
851 }
852
853 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
854 {
855 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
856
857 xfrm_state_flush(p->proto);
858 return 0;
859 }
860
861 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
862 {
863 xfrm_policy_flush();
864 return 0;
865 }
866
867 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
868
869 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
870 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
871 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
872 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
873 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
874 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
875 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
876 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
877 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
878 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
879 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
880 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
881 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
882 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
883 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
884 };
885
886 #undef XMSGSIZE
887
888 static struct xfrm_link {
889 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
890 int (*dump)(struct sk_buff *, struct netlink_callback *);
891 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
892 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
893 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
894 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
895 .dump = xfrm_dump_sa },
896 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
897 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
898 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
899 .dump = xfrm_dump_policy },
900 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
901 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
902 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
903 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
904 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
905 };
906
907 static int xfrm_done(struct netlink_callback *cb)
908 {
909 return 0;
910 }
911
912 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
913 {
914 struct rtattr *xfrma[XFRMA_MAX];
915 struct xfrm_link *link;
916 int type, min_len;
917
918 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
919 return 0;
920
921 type = nlh->nlmsg_type;
922
923 /* A control message: ignore them */
924 if (type < XFRM_MSG_BASE)
925 return 0;
926
927 /* Unknown message: reply with EINVAL */
928 if (type > XFRM_MSG_MAX)
929 goto err_einval;
930
931 type -= XFRM_MSG_BASE;
932 link = &xfrm_dispatch[type];
933
934 /* All operations require privileges, even GET */
935 if (security_netlink_recv(skb)) {
936 *errp = -EPERM;
937 return -1;
938 }
939
940 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
941 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
942 (nlh->nlmsg_flags & NLM_F_DUMP)) {
943 u32 rlen;
944
945 if (link->dump == NULL)
946 goto err_einval;
947
948 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
949 link->dump,
950 xfrm_done)) != 0) {
951 return -1;
952 }
953 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
954 if (rlen > skb->len)
955 rlen = skb->len;
956 skb_pull(skb, rlen);
957 return -1;
958 }
959
960 memset(xfrma, 0, sizeof(xfrma));
961
962 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
963 goto err_einval;
964
965 if (nlh->nlmsg_len > min_len) {
966 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
967 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
968
969 while (RTA_OK(attr, attrlen)) {
970 unsigned short flavor = attr->rta_type;
971 if (flavor) {
972 if (flavor > XFRMA_MAX)
973 goto err_einval;
974 xfrma[flavor - 1] = attr;
975 }
976 attr = RTA_NEXT(attr, attrlen);
977 }
978 }
979
980 if (link->doit == NULL)
981 goto err_einval;
982 *errp = link->doit(skb, nlh, (void **) &xfrma);
983
984 return *errp;
985
986 err_einval:
987 *errp = -EINVAL;
988 return -1;
989 }
990
991 static int xfrm_user_rcv_skb(struct sk_buff *skb)
992 {
993 int err;
994 struct nlmsghdr *nlh;
995
996 while (skb->len >= NLMSG_SPACE(0)) {
997 u32 rlen;
998
999 nlh = (struct nlmsghdr *) skb->data;
1000 if (nlh->nlmsg_len < sizeof(*nlh) ||
1001 skb->len < nlh->nlmsg_len)
1002 return 0;
1003 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1004 if (rlen > skb->len)
1005 rlen = skb->len;
1006 if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
1007 if (err == 0)
1008 return -1;
1009 netlink_ack(skb, nlh, err);
1010 } else if (nlh->nlmsg_flags & NLM_F_ACK)
1011 netlink_ack(skb, nlh, 0);
1012 skb_pull(skb, rlen);
1013 }
1014
1015 return 0;
1016 }
1017
1018 static void xfrm_netlink_rcv(struct sock *sk, int len)
1019 {
1020 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
1021
1022 do {
1023 struct sk_buff *skb;
1024
1025 down(&xfrm_cfg_sem);
1026
1027 if (qlen > skb_queue_len(&sk->sk_receive_queue))
1028 qlen = skb_queue_len(&sk->sk_receive_queue);
1029
1030 for (; qlen; qlen--) {
1031 skb = skb_dequeue(&sk->sk_receive_queue);
1032 if (xfrm_user_rcv_skb(skb)) {
1033 if (skb->len)
1034 skb_queue_head(&sk->sk_receive_queue,
1035 skb);
1036 else {
1037 kfree_skb(skb);
1038 qlen--;
1039 }
1040 break;
1041 }
1042 kfree_skb(skb);
1043 }
1044
1045 up(&xfrm_cfg_sem);
1046
1047 } while (qlen);
1048 }
1049
1050 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
1051 {
1052 struct xfrm_user_expire *ue;
1053 struct nlmsghdr *nlh;
1054 unsigned char *b = skb->tail;
1055
1056 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
1057 sizeof(*ue));
1058 ue = NLMSG_DATA(nlh);
1059 nlh->nlmsg_flags = 0;
1060
1061 copy_to_user_state(x, &ue->state);
1062 ue->hard = (hard != 0) ? 1 : 0;
1063
1064 nlh->nlmsg_len = skb->tail - b;
1065 return skb->len;
1066
1067 nlmsg_failure:
1068 skb_trim(skb, b - skb->data);
1069 return -1;
1070 }
1071
1072 static int xfrm_send_state_notify(struct xfrm_state *x, int hard)
1073 {
1074 struct sk_buff *skb;
1075
1076 skb = alloc_skb(sizeof(struct xfrm_user_expire) + 16, GFP_ATOMIC);
1077 if (skb == NULL)
1078 return -ENOMEM;
1079
1080 if (build_expire(skb, x, hard) < 0)
1081 BUG();
1082
1083 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1084
1085 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1086 }
1087
1088 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1089 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1090 int dir)
1091 {
1092 struct xfrm_user_acquire *ua;
1093 struct nlmsghdr *nlh;
1094 unsigned char *b = skb->tail;
1095 __u32 seq = xfrm_get_acqseq();
1096
1097 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1098 sizeof(*ua));
1099 ua = NLMSG_DATA(nlh);
1100 nlh->nlmsg_flags = 0;
1101
1102 memcpy(&ua->id, &x->id, sizeof(ua->id));
1103 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1104 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1105 copy_to_user_policy(xp, &ua->policy, dir);
1106 ua->aalgos = xt->aalgos;
1107 ua->ealgos = xt->ealgos;
1108 ua->calgos = xt->calgos;
1109 ua->seq = x->km.seq = seq;
1110
1111 if (copy_to_user_tmpl(xp, skb) < 0)
1112 goto nlmsg_failure;
1113
1114 nlh->nlmsg_len = skb->tail - b;
1115 return skb->len;
1116
1117 nlmsg_failure:
1118 skb_trim(skb, b - skb->data);
1119 return -1;
1120 }
1121
1122 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1123 struct xfrm_policy *xp, int dir)
1124 {
1125 struct sk_buff *skb;
1126 size_t len;
1127
1128 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1129 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1130 skb = alloc_skb(len, GFP_ATOMIC);
1131 if (skb == NULL)
1132 return -ENOMEM;
1133
1134 if (build_acquire(skb, x, xt, xp, dir) < 0)
1135 BUG();
1136
1137 NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE;
1138
1139 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC);
1140 }
1141
1142 /* User gives us xfrm_user_policy_info followed by an array of 0
1143 * or more templates.
1144 */
1145 static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1146 u8 *data, int len, int *dir)
1147 {
1148 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1149 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1150 struct xfrm_policy *xp;
1151 int nr;
1152
1153 switch (family) {
1154 case AF_INET:
1155 if (opt != IP_XFRM_POLICY) {
1156 *dir = -EOPNOTSUPP;
1157 return NULL;
1158 }
1159 break;
1160 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1161 case AF_INET6:
1162 if (opt != IPV6_XFRM_POLICY) {
1163 *dir = -EOPNOTSUPP;
1164 return NULL;
1165 }
1166 break;
1167 #endif
1168 default:
1169 *dir = -EINVAL;
1170 return NULL;
1171 }
1172
1173 *dir = -EINVAL;
1174
1175 if (len < sizeof(*p) ||
1176 verify_newpolicy_info(p))
1177 return NULL;
1178
1179 nr = ((len - sizeof(*p)) / sizeof(*ut));
1180 if (nr > XFRM_MAX_DEPTH)
1181 return NULL;
1182
1183 xp = xfrm_policy_alloc(GFP_KERNEL);
1184 if (xp == NULL) {
1185 *dir = -ENOBUFS;
1186 return NULL;
1187 }
1188
1189 copy_from_user_policy(xp, p);
1190 copy_templates(xp, ut, nr);
1191
1192 *dir = p->dir;
1193
1194 return xp;
1195 }
1196
1197 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1198 int dir, int hard)
1199 {
1200 struct xfrm_user_polexpire *upe;
1201 struct nlmsghdr *nlh;
1202 unsigned char *b = skb->tail;
1203
1204 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1205 upe = NLMSG_DATA(nlh);
1206 nlh->nlmsg_flags = 0;
1207
1208 copy_to_user_policy(xp, &upe->pol, dir);
1209 if (copy_to_user_tmpl(xp, skb) < 0)
1210 goto nlmsg_failure;
1211 upe->hard = !!hard;
1212
1213 nlh->nlmsg_len = skb->tail - b;
1214 return skb->len;
1215
1216 nlmsg_failure:
1217 skb_trim(skb, b - skb->data);
1218 return -1;
1219 }
1220
1221 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, int hard)
1222 {
1223 struct sk_buff *skb;
1224 size_t len;
1225
1226 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1227 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1228 skb = alloc_skb(len, GFP_ATOMIC);
1229 if (skb == NULL)
1230 return -ENOMEM;
1231
1232 if (build_polexpire(skb, xp, dir, hard) < 0)
1233 BUG();
1234
1235 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1236
1237 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1238 }
1239
1240 static struct xfrm_mgr netlink_mgr = {
1241 .id = "netlink",
1242 .notify = xfrm_send_state_notify,
1243 .acquire = xfrm_send_acquire,
1244 .compile_policy = xfrm_compile_policy,
1245 .notify_policy = xfrm_send_policy_notify,
1246 };
1247
1248 static int __init xfrm_user_init(void)
1249 {
1250 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1251
1252 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv);
1253 if (xfrm_nl == NULL)
1254 return -ENOMEM;
1255
1256 xfrm_register_km(&netlink_mgr);
1257
1258 return 0;
1259 }
1260
1261 static void __exit xfrm_user_exit(void)
1262 {
1263 xfrm_unregister_km(&netlink_mgr);
1264 sock_release(xfrm_nl->sk_socket);
1265 }
1266
1267 module_init(xfrm_user_init);
1268 module_exit(xfrm_user_exit);
1269 MODULE_LICENSE("GPL");
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