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[XFRM/RTNETLINK]: Decrement qlen properly in {xfrm_,rt}netlink_rcv().
[deliverable/linux.git] / net / xfrm / xfrm_user.c
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/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
38 if (!rt)
39 return 0;
40
41 if ((rt->rta_len - sizeof(*rt)) < sizeof(*algp))
42 return -EINVAL;
43
44 algp = RTA_DATA(rt);
45 switch (type) {
46 case XFRMA_ALG_AUTH:
47 if (!algp->alg_key_len &&
48 strcmp(algp->alg_name, "digest_null") != 0)
49 return -EINVAL;
50 break;
51
52 case XFRMA_ALG_CRYPT:
53 if (!algp->alg_key_len &&
54 strcmp(algp->alg_name, "cipher_null") != 0)
55 return -EINVAL;
56 break;
57
58 case XFRMA_ALG_COMP:
59 /* Zero length keys are legal. */
60 break;
61
62 default:
63 return -EINVAL;
64 };
65
66 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
67 return 0;
68 }
69
70 static int verify_encap_tmpl(struct rtattr **xfrma)
71 {
72 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
73 struct xfrm_encap_tmpl *encap;
74
75 if (!rt)
76 return 0;
77
78 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
79 return -EINVAL;
80
81 return 0;
82 }
83
84 static int verify_newsa_info(struct xfrm_usersa_info *p,
85 struct rtattr **xfrma)
86 {
87 int err;
88
89 err = -EINVAL;
90 switch (p->family) {
91 case AF_INET:
92 break;
93
94 case AF_INET6:
95 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
96 break;
97 #else
98 err = -EAFNOSUPPORT;
99 goto out;
100 #endif
101
102 default:
103 goto out;
104 };
105
106 err = -EINVAL;
107 switch (p->id.proto) {
108 case IPPROTO_AH:
109 if (!xfrma[XFRMA_ALG_AUTH-1] ||
110 xfrma[XFRMA_ALG_CRYPT-1] ||
111 xfrma[XFRMA_ALG_COMP-1])
112 goto out;
113 break;
114
115 case IPPROTO_ESP:
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_COMP:
123 if (!xfrma[XFRMA_ALG_COMP-1] ||
124 xfrma[XFRMA_ALG_AUTH-1] ||
125 xfrma[XFRMA_ALG_CRYPT-1])
126 goto out;
127 break;
128
129 default:
130 goto out;
131 };
132
133 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
134 goto out;
135 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
136 goto out;
137 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
138 goto out;
139 if ((err = verify_encap_tmpl(xfrma)))
140 goto out;
141
142 err = -EINVAL;
143 switch (p->mode) {
144 case 0:
145 case 1:
146 break;
147
148 default:
149 goto out;
150 };
151
152 err = 0;
153
154 out:
155 return err;
156 }
157
158 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
159 struct xfrm_algo_desc *(*get_byname)(char *, int),
160 struct rtattr *u_arg)
161 {
162 struct rtattr *rta = u_arg;
163 struct xfrm_algo *p, *ualg;
164 struct xfrm_algo_desc *algo;
165
166 if (!rta)
167 return 0;
168
169 ualg = RTA_DATA(rta);
170
171 algo = get_byname(ualg->alg_name, 1);
172 if (!algo)
173 return -ENOSYS;
174 *props = algo->desc.sadb_alg_id;
175
176 p = kmalloc(sizeof(*ualg) + ualg->alg_key_len, GFP_KERNEL);
177 if (!p)
178 return -ENOMEM;
179
180 memcpy(p, ualg, sizeof(*ualg) + ualg->alg_key_len);
181 *algpp = p;
182 return 0;
183 }
184
185 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
186 {
187 struct rtattr *rta = u_arg;
188 struct xfrm_encap_tmpl *p, *uencap;
189
190 if (!rta)
191 return 0;
192
193 uencap = RTA_DATA(rta);
194 p = kmalloc(sizeof(*p), GFP_KERNEL);
195 if (!p)
196 return -ENOMEM;
197
198 memcpy(p, uencap, sizeof(*p));
199 *encapp = p;
200 return 0;
201 }
202
203 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
204 {
205 memcpy(&x->id, &p->id, sizeof(x->id));
206 memcpy(&x->sel, &p->sel, sizeof(x->sel));
207 memcpy(&x->lft, &p->lft, sizeof(x->lft));
208 x->props.mode = p->mode;
209 x->props.replay_window = p->replay_window;
210 x->props.reqid = p->reqid;
211 x->props.family = p->family;
212 x->props.saddr = p->saddr;
213 x->props.flags = p->flags;
214 }
215
216 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
217 struct rtattr **xfrma,
218 int *errp)
219 {
220 struct xfrm_state *x = xfrm_state_alloc();
221 int err = -ENOMEM;
222
223 if (!x)
224 goto error_no_put;
225
226 copy_from_user_state(x, p);
227
228 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
229 xfrm_aalg_get_byname,
230 xfrma[XFRMA_ALG_AUTH-1])))
231 goto error;
232 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
233 xfrm_ealg_get_byname,
234 xfrma[XFRMA_ALG_CRYPT-1])))
235 goto error;
236 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
237 xfrm_calg_get_byname,
238 xfrma[XFRMA_ALG_COMP-1])))
239 goto error;
240 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
241 goto error;
242
243 err = -ENOENT;
244 x->type = xfrm_get_type(x->id.proto, x->props.family);
245 if (x->type == NULL)
246 goto error;
247
248 err = x->type->init_state(x, NULL);
249 if (err)
250 goto error;
251
252 x->curlft.add_time = (unsigned long) xtime.tv_sec;
253 x->km.state = XFRM_STATE_VALID;
254 x->km.seq = p->seq;
255
256 return x;
257
258 error:
259 x->km.state = XFRM_STATE_DEAD;
260 xfrm_state_put(x);
261 error_no_put:
262 *errp = err;
263 return NULL;
264 }
265
266 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
267 {
268 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
269 struct xfrm_state *x;
270 int err;
271
272 err = verify_newsa_info(p, (struct rtattr **) xfrma);
273 if (err)
274 return err;
275
276 x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
277 if (!x)
278 return err;
279
280 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
281 err = xfrm_state_add(x);
282 else
283 err = xfrm_state_update(x);
284
285 if (err < 0) {
286 x->km.state = XFRM_STATE_DEAD;
287 xfrm_state_put(x);
288 }
289
290 return err;
291 }
292
293 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
294 {
295 struct xfrm_state *x;
296 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
297
298 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
299 if (x == NULL)
300 return -ESRCH;
301
302 if (xfrm_state_kern(x)) {
303 xfrm_state_put(x);
304 return -EPERM;
305 }
306
307 xfrm_state_delete(x);
308 xfrm_state_put(x);
309
310 return 0;
311 }
312
313 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
314 {
315 memcpy(&p->id, &x->id, sizeof(p->id));
316 memcpy(&p->sel, &x->sel, sizeof(p->sel));
317 memcpy(&p->lft, &x->lft, sizeof(p->lft));
318 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
319 memcpy(&p->stats, &x->stats, sizeof(p->stats));
320 p->saddr = x->props.saddr;
321 p->mode = x->props.mode;
322 p->replay_window = x->props.replay_window;
323 p->reqid = x->props.reqid;
324 p->family = x->props.family;
325 p->flags = x->props.flags;
326 p->seq = x->km.seq;
327 }
328
329 struct xfrm_dump_info {
330 struct sk_buff *in_skb;
331 struct sk_buff *out_skb;
332 u32 nlmsg_seq;
333 u16 nlmsg_flags;
334 int start_idx;
335 int this_idx;
336 };
337
338 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
339 {
340 struct xfrm_dump_info *sp = ptr;
341 struct sk_buff *in_skb = sp->in_skb;
342 struct sk_buff *skb = sp->out_skb;
343 struct xfrm_usersa_info *p;
344 struct nlmsghdr *nlh;
345 unsigned char *b = skb->tail;
346
347 if (sp->this_idx < sp->start_idx)
348 goto out;
349
350 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
351 sp->nlmsg_seq,
352 XFRM_MSG_NEWSA, sizeof(*p));
353 nlh->nlmsg_flags = sp->nlmsg_flags;
354
355 p = NLMSG_DATA(nlh);
356 copy_to_user_state(x, p);
357
358 if (x->aalg)
359 RTA_PUT(skb, XFRMA_ALG_AUTH,
360 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
361 if (x->ealg)
362 RTA_PUT(skb, XFRMA_ALG_CRYPT,
363 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
364 if (x->calg)
365 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
366
367 if (x->encap)
368 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
369
370 nlh->nlmsg_len = skb->tail - b;
371 out:
372 sp->this_idx++;
373 return 0;
374
375 nlmsg_failure:
376 rtattr_failure:
377 skb_trim(skb, b - skb->data);
378 return -1;
379 }
380
381 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
382 {
383 struct xfrm_dump_info info;
384
385 info.in_skb = cb->skb;
386 info.out_skb = skb;
387 info.nlmsg_seq = cb->nlh->nlmsg_seq;
388 info.nlmsg_flags = NLM_F_MULTI;
389 info.this_idx = 0;
390 info.start_idx = cb->args[0];
391 (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
392 cb->args[0] = info.this_idx;
393
394 return skb->len;
395 }
396
397 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
398 struct xfrm_state *x, u32 seq)
399 {
400 struct xfrm_dump_info info;
401 struct sk_buff *skb;
402
403 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
404 if (!skb)
405 return ERR_PTR(-ENOMEM);
406
407 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
408 info.in_skb = in_skb;
409 info.out_skb = skb;
410 info.nlmsg_seq = seq;
411 info.nlmsg_flags = 0;
412 info.this_idx = info.start_idx = 0;
413
414 if (dump_one_state(x, 0, &info)) {
415 kfree_skb(skb);
416 return NULL;
417 }
418
419 return skb;
420 }
421
422 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
423 {
424 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
425 struct xfrm_state *x;
426 struct sk_buff *resp_skb;
427 int err;
428
429 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
430 err = -ESRCH;
431 if (x == NULL)
432 goto out_noput;
433
434 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
435 if (IS_ERR(resp_skb)) {
436 err = PTR_ERR(resp_skb);
437 } else {
438 err = netlink_unicast(xfrm_nl, resp_skb,
439 NETLINK_CB(skb).pid, MSG_DONTWAIT);
440 }
441 xfrm_state_put(x);
442 out_noput:
443 return err;
444 }
445
446 static int verify_userspi_info(struct xfrm_userspi_info *p)
447 {
448 switch (p->info.id.proto) {
449 case IPPROTO_AH:
450 case IPPROTO_ESP:
451 break;
452
453 case IPPROTO_COMP:
454 /* IPCOMP spi is 16-bits. */
455 if (p->max >= 0x10000)
456 return -EINVAL;
457 break;
458
459 default:
460 return -EINVAL;
461 };
462
463 if (p->min > p->max)
464 return -EINVAL;
465
466 return 0;
467 }
468
469 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
470 {
471 struct xfrm_state *x;
472 struct xfrm_userspi_info *p;
473 struct sk_buff *resp_skb;
474 xfrm_address_t *daddr;
475 int family;
476 int err;
477
478 p = NLMSG_DATA(nlh);
479 err = verify_userspi_info(p);
480 if (err)
481 goto out_noput;
482
483 family = p->info.family;
484 daddr = &p->info.id.daddr;
485
486 x = NULL;
487 if (p->info.seq) {
488 x = xfrm_find_acq_byseq(p->info.seq);
489 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
490 xfrm_state_put(x);
491 x = NULL;
492 }
493 }
494
495 if (!x)
496 x = xfrm_find_acq(p->info.mode, p->info.reqid,
497 p->info.id.proto, daddr,
498 &p->info.saddr, 1,
499 family);
500 err = -ENOENT;
501 if (x == NULL)
502 goto out_noput;
503
504 resp_skb = ERR_PTR(-ENOENT);
505
506 spin_lock_bh(&x->lock);
507 if (x->km.state != XFRM_STATE_DEAD) {
508 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
509 if (x->id.spi)
510 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
511 }
512 spin_unlock_bh(&x->lock);
513
514 if (IS_ERR(resp_skb)) {
515 err = PTR_ERR(resp_skb);
516 goto out;
517 }
518
519 err = netlink_unicast(xfrm_nl, resp_skb,
520 NETLINK_CB(skb).pid, MSG_DONTWAIT);
521
522 out:
523 xfrm_state_put(x);
524 out_noput:
525 return err;
526 }
527
528 static int verify_policy_dir(__u8 dir)
529 {
530 switch (dir) {
531 case XFRM_POLICY_IN:
532 case XFRM_POLICY_OUT:
533 case XFRM_POLICY_FWD:
534 break;
535
536 default:
537 return -EINVAL;
538 };
539
540 return 0;
541 }
542
543 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
544 {
545 switch (p->share) {
546 case XFRM_SHARE_ANY:
547 case XFRM_SHARE_SESSION:
548 case XFRM_SHARE_USER:
549 case XFRM_SHARE_UNIQUE:
550 break;
551
552 default:
553 return -EINVAL;
554 };
555
556 switch (p->action) {
557 case XFRM_POLICY_ALLOW:
558 case XFRM_POLICY_BLOCK:
559 break;
560
561 default:
562 return -EINVAL;
563 };
564
565 switch (p->sel.family) {
566 case AF_INET:
567 break;
568
569 case AF_INET6:
570 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
571 break;
572 #else
573 return -EAFNOSUPPORT;
574 #endif
575
576 default:
577 return -EINVAL;
578 };
579
580 return verify_policy_dir(p->dir);
581 }
582
583 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
584 int nr)
585 {
586 int i;
587
588 xp->xfrm_nr = nr;
589 for (i = 0; i < nr; i++, ut++) {
590 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
591
592 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
593 memcpy(&t->saddr, &ut->saddr,
594 sizeof(xfrm_address_t));
595 t->reqid = ut->reqid;
596 t->mode = ut->mode;
597 t->share = ut->share;
598 t->optional = ut->optional;
599 t->aalgos = ut->aalgos;
600 t->ealgos = ut->ealgos;
601 t->calgos = ut->calgos;
602 }
603 }
604
605 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
606 {
607 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
608 struct xfrm_user_tmpl *utmpl;
609 int nr;
610
611 if (!rt) {
612 pol->xfrm_nr = 0;
613 } else {
614 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
615
616 if (nr > XFRM_MAX_DEPTH)
617 return -EINVAL;
618
619 copy_templates(pol, RTA_DATA(rt), nr);
620 }
621 return 0;
622 }
623
624 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
625 {
626 xp->priority = p->priority;
627 xp->index = p->index;
628 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
629 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
630 xp->action = p->action;
631 xp->flags = p->flags;
632 xp->family = p->sel.family;
633 /* XXX xp->share = p->share; */
634 }
635
636 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
637 {
638 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
639 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
640 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
641 p->priority = xp->priority;
642 p->index = xp->index;
643 p->sel.family = xp->family;
644 p->dir = dir;
645 p->action = xp->action;
646 p->flags = xp->flags;
647 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
648 }
649
650 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
651 {
652 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
653 int err;
654
655 if (!xp) {
656 *errp = -ENOMEM;
657 return NULL;
658 }
659
660 copy_from_user_policy(xp, p);
661 err = copy_from_user_tmpl(xp, xfrma);
662 if (err) {
663 *errp = err;
664 kfree(xp);
665 xp = NULL;
666 }
667
668 return xp;
669 }
670
671 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
672 {
673 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
674 struct xfrm_policy *xp;
675 int err;
676 int excl;
677
678 err = verify_newpolicy_info(p);
679 if (err)
680 return err;
681
682 xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
683 if (!xp)
684 return err;
685
686 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
687 err = xfrm_policy_insert(p->dir, xp, excl);
688 if (err) {
689 kfree(xp);
690 return err;
691 }
692
693 xfrm_pol_put(xp);
694
695 return 0;
696 }
697
698 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
699 {
700 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
701 int i;
702
703 if (xp->xfrm_nr == 0)
704 return 0;
705
706 for (i = 0; i < xp->xfrm_nr; i++) {
707 struct xfrm_user_tmpl *up = &vec[i];
708 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
709
710 memcpy(&up->id, &kp->id, sizeof(up->id));
711 up->family = xp->family;
712 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
713 up->reqid = kp->reqid;
714 up->mode = kp->mode;
715 up->share = kp->share;
716 up->optional = kp->optional;
717 up->aalgos = kp->aalgos;
718 up->ealgos = kp->ealgos;
719 up->calgos = kp->calgos;
720 }
721 RTA_PUT(skb, XFRMA_TMPL,
722 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
723 vec);
724
725 return 0;
726
727 rtattr_failure:
728 return -1;
729 }
730
731 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
732 {
733 struct xfrm_dump_info *sp = ptr;
734 struct xfrm_userpolicy_info *p;
735 struct sk_buff *in_skb = sp->in_skb;
736 struct sk_buff *skb = sp->out_skb;
737 struct nlmsghdr *nlh;
738 unsigned char *b = skb->tail;
739
740 if (sp->this_idx < sp->start_idx)
741 goto out;
742
743 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
744 sp->nlmsg_seq,
745 XFRM_MSG_NEWPOLICY, sizeof(*p));
746 p = NLMSG_DATA(nlh);
747 nlh->nlmsg_flags = sp->nlmsg_flags;
748
749 copy_to_user_policy(xp, p, dir);
750 if (copy_to_user_tmpl(xp, skb) < 0)
751 goto nlmsg_failure;
752
753 nlh->nlmsg_len = skb->tail - b;
754 out:
755 sp->this_idx++;
756 return 0;
757
758 nlmsg_failure:
759 skb_trim(skb, b - skb->data);
760 return -1;
761 }
762
763 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
764 {
765 struct xfrm_dump_info info;
766
767 info.in_skb = cb->skb;
768 info.out_skb = skb;
769 info.nlmsg_seq = cb->nlh->nlmsg_seq;
770 info.nlmsg_flags = NLM_F_MULTI;
771 info.this_idx = 0;
772 info.start_idx = cb->args[0];
773 (void) xfrm_policy_walk(dump_one_policy, &info);
774 cb->args[0] = info.this_idx;
775
776 return skb->len;
777 }
778
779 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
780 struct xfrm_policy *xp,
781 int dir, u32 seq)
782 {
783 struct xfrm_dump_info info;
784 struct sk_buff *skb;
785
786 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
787 if (!skb)
788 return ERR_PTR(-ENOMEM);
789
790 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
791 info.in_skb = in_skb;
792 info.out_skb = skb;
793 info.nlmsg_seq = seq;
794 info.nlmsg_flags = 0;
795 info.this_idx = info.start_idx = 0;
796
797 if (dump_one_policy(xp, dir, 0, &info) < 0) {
798 kfree_skb(skb);
799 return NULL;
800 }
801
802 return skb;
803 }
804
805 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
806 {
807 struct xfrm_policy *xp;
808 struct xfrm_userpolicy_id *p;
809 int err;
810 int delete;
811
812 p = NLMSG_DATA(nlh);
813 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
814
815 err = verify_policy_dir(p->dir);
816 if (err)
817 return err;
818
819 if (p->index)
820 xp = xfrm_policy_byid(p->dir, p->index, delete);
821 else
822 xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
823 if (xp == NULL)
824 return -ENOENT;
825
826 if (!delete) {
827 struct sk_buff *resp_skb;
828
829 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
830 if (IS_ERR(resp_skb)) {
831 err = PTR_ERR(resp_skb);
832 } else {
833 err = netlink_unicast(xfrm_nl, resp_skb,
834 NETLINK_CB(skb).pid,
835 MSG_DONTWAIT);
836 }
837 }
838
839 xfrm_pol_put(xp);
840
841 return err;
842 }
843
844 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
845 {
846 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
847
848 xfrm_state_flush(p->proto);
849 return 0;
850 }
851
852 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
853 {
854 xfrm_policy_flush();
855 return 0;
856 }
857
858 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
859
860 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
861 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
862 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
863 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
864 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
865 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
866 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
867 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
868 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
869 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
870 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
871 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
872 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
873 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
874 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
875 };
876
877 #undef XMSGSIZE
878
879 static struct xfrm_link {
880 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
881 int (*dump)(struct sk_buff *, struct netlink_callback *);
882 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
883 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
884 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
885 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
886 .dump = xfrm_dump_sa },
887 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
888 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
889 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
890 .dump = xfrm_dump_policy },
891 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
892 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
893 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
894 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
895 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
896 };
897
898 static int xfrm_done(struct netlink_callback *cb)
899 {
900 return 0;
901 }
902
903 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
904 {
905 struct rtattr *xfrma[XFRMA_MAX];
906 struct xfrm_link *link;
907 int type, min_len;
908
909 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
910 return 0;
911
912 type = nlh->nlmsg_type;
913
914 /* A control message: ignore them */
915 if (type < XFRM_MSG_BASE)
916 return 0;
917
918 /* Unknown message: reply with EINVAL */
919 if (type > XFRM_MSG_MAX)
920 goto err_einval;
921
922 type -= XFRM_MSG_BASE;
923 link = &xfrm_dispatch[type];
924
925 /* All operations require privileges, even GET */
926 if (security_netlink_recv(skb)) {
927 *errp = -EPERM;
928 return -1;
929 }
930
931 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
932 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
933 (nlh->nlmsg_flags & NLM_F_DUMP)) {
934 u32 rlen;
935
936 if (link->dump == NULL)
937 goto err_einval;
938
939 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
940 link->dump,
941 xfrm_done)) != 0) {
942 return -1;
943 }
944 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
945 if (rlen > skb->len)
946 rlen = skb->len;
947 skb_pull(skb, rlen);
948 return -1;
949 }
950
951 memset(xfrma, 0, sizeof(xfrma));
952
953 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
954 goto err_einval;
955
956 if (nlh->nlmsg_len > min_len) {
957 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
958 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
959
960 while (RTA_OK(attr, attrlen)) {
961 unsigned short flavor = attr->rta_type;
962 if (flavor) {
963 if (flavor > XFRMA_MAX)
964 goto err_einval;
965 xfrma[flavor - 1] = attr;
966 }
967 attr = RTA_NEXT(attr, attrlen);
968 }
969 }
970
971 if (link->doit == NULL)
972 goto err_einval;
973 *errp = link->doit(skb, nlh, (void **) &xfrma);
974
975 return *errp;
976
977 err_einval:
978 *errp = -EINVAL;
979 return -1;
980 }
981
982 static int xfrm_user_rcv_skb(struct sk_buff *skb)
983 {
984 int err;
985 struct nlmsghdr *nlh;
986
987 while (skb->len >= NLMSG_SPACE(0)) {
988 u32 rlen;
989
990 nlh = (struct nlmsghdr *) skb->data;
991 if (nlh->nlmsg_len < sizeof(*nlh) ||
992 skb->len < nlh->nlmsg_len)
993 return 0;
994 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
995 if (rlen > skb->len)
996 rlen = skb->len;
997 if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
998 if (err == 0)
999 return -1;
1000 netlink_ack(skb, nlh, err);
1001 } else if (nlh->nlmsg_flags & NLM_F_ACK)
1002 netlink_ack(skb, nlh, 0);
1003 skb_pull(skb, rlen);
1004 }
1005
1006 return 0;
1007 }
1008
1009 static void xfrm_netlink_rcv(struct sock *sk, int len)
1010 {
1011 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
1012
1013 do {
1014 struct sk_buff *skb;
1015
1016 down(&xfrm_cfg_sem);
1017
1018 if (qlen > skb_queue_len(&sk->sk_receive_queue))
1019 qlen = skb_queue_len(&sk->sk_receive_queue);
1020
1021 for (; qlen; qlen--) {
1022 skb = skb_dequeue(&sk->sk_receive_queue);
1023 if (xfrm_user_rcv_skb(skb)) {
1024 if (skb->len)
1025 skb_queue_head(&sk->sk_receive_queue,
1026 skb);
1027 else {
1028 kfree_skb(skb);
1029 qlen--;
1030 }
1031 break;
1032 }
1033 kfree_skb(skb);
1034 }
1035
1036 up(&xfrm_cfg_sem);
1037
1038 } while (qlen);
1039 }
1040
1041 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
1042 {
1043 struct xfrm_user_expire *ue;
1044 struct nlmsghdr *nlh;
1045 unsigned char *b = skb->tail;
1046
1047 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
1048 sizeof(*ue));
1049 ue = NLMSG_DATA(nlh);
1050 nlh->nlmsg_flags = 0;
1051
1052 copy_to_user_state(x, &ue->state);
1053 ue->hard = (hard != 0) ? 1 : 0;
1054
1055 nlh->nlmsg_len = skb->tail - b;
1056 return skb->len;
1057
1058 nlmsg_failure:
1059 skb_trim(skb, b - skb->data);
1060 return -1;
1061 }
1062
1063 static int xfrm_send_state_notify(struct xfrm_state *x, int hard)
1064 {
1065 struct sk_buff *skb;
1066
1067 skb = alloc_skb(sizeof(struct xfrm_user_expire) + 16, GFP_ATOMIC);
1068 if (skb == NULL)
1069 return -ENOMEM;
1070
1071 if (build_expire(skb, x, hard) < 0)
1072 BUG();
1073
1074 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1075
1076 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1077 }
1078
1079 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1080 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1081 int dir)
1082 {
1083 struct xfrm_user_acquire *ua;
1084 struct nlmsghdr *nlh;
1085 unsigned char *b = skb->tail;
1086 __u32 seq = xfrm_get_acqseq();
1087
1088 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1089 sizeof(*ua));
1090 ua = NLMSG_DATA(nlh);
1091 nlh->nlmsg_flags = 0;
1092
1093 memcpy(&ua->id, &x->id, sizeof(ua->id));
1094 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1095 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1096 copy_to_user_policy(xp, &ua->policy, dir);
1097 ua->aalgos = xt->aalgos;
1098 ua->ealgos = xt->ealgos;
1099 ua->calgos = xt->calgos;
1100 ua->seq = x->km.seq = seq;
1101
1102 if (copy_to_user_tmpl(xp, skb) < 0)
1103 goto nlmsg_failure;
1104
1105 nlh->nlmsg_len = skb->tail - b;
1106 return skb->len;
1107
1108 nlmsg_failure:
1109 skb_trim(skb, b - skb->data);
1110 return -1;
1111 }
1112
1113 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1114 struct xfrm_policy *xp, int dir)
1115 {
1116 struct sk_buff *skb;
1117 size_t len;
1118
1119 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1120 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1121 skb = alloc_skb(len, GFP_ATOMIC);
1122 if (skb == NULL)
1123 return -ENOMEM;
1124
1125 if (build_acquire(skb, x, xt, xp, dir) < 0)
1126 BUG();
1127
1128 NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE;
1129
1130 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC);
1131 }
1132
1133 /* User gives us xfrm_user_policy_info followed by an array of 0
1134 * or more templates.
1135 */
1136 static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1137 u8 *data, int len, int *dir)
1138 {
1139 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1140 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1141 struct xfrm_policy *xp;
1142 int nr;
1143
1144 switch (family) {
1145 case AF_INET:
1146 if (opt != IP_XFRM_POLICY) {
1147 *dir = -EOPNOTSUPP;
1148 return NULL;
1149 }
1150 break;
1151 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1152 case AF_INET6:
1153 if (opt != IPV6_XFRM_POLICY) {
1154 *dir = -EOPNOTSUPP;
1155 return NULL;
1156 }
1157 break;
1158 #endif
1159 default:
1160 *dir = -EINVAL;
1161 return NULL;
1162 }
1163
1164 *dir = -EINVAL;
1165
1166 if (len < sizeof(*p) ||
1167 verify_newpolicy_info(p))
1168 return NULL;
1169
1170 nr = ((len - sizeof(*p)) / sizeof(*ut));
1171 if (nr > XFRM_MAX_DEPTH)
1172 return NULL;
1173
1174 xp = xfrm_policy_alloc(GFP_KERNEL);
1175 if (xp == NULL) {
1176 *dir = -ENOBUFS;
1177 return NULL;
1178 }
1179
1180 copy_from_user_policy(xp, p);
1181 copy_templates(xp, ut, nr);
1182
1183 *dir = p->dir;
1184
1185 return xp;
1186 }
1187
1188 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1189 int dir, int hard)
1190 {
1191 struct xfrm_user_polexpire *upe;
1192 struct nlmsghdr *nlh;
1193 unsigned char *b = skb->tail;
1194
1195 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1196 upe = NLMSG_DATA(nlh);
1197 nlh->nlmsg_flags = 0;
1198
1199 copy_to_user_policy(xp, &upe->pol, dir);
1200 if (copy_to_user_tmpl(xp, skb) < 0)
1201 goto nlmsg_failure;
1202 upe->hard = !!hard;
1203
1204 nlh->nlmsg_len = skb->tail - b;
1205 return skb->len;
1206
1207 nlmsg_failure:
1208 skb_trim(skb, b - skb->data);
1209 return -1;
1210 }
1211
1212 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, int hard)
1213 {
1214 struct sk_buff *skb;
1215 size_t len;
1216
1217 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1218 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1219 skb = alloc_skb(len, GFP_ATOMIC);
1220 if (skb == NULL)
1221 return -ENOMEM;
1222
1223 if (build_polexpire(skb, xp, dir, hard) < 0)
1224 BUG();
1225
1226 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1227
1228 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1229 }
1230
1231 static struct xfrm_mgr netlink_mgr = {
1232 .id = "netlink",
1233 .notify = xfrm_send_state_notify,
1234 .acquire = xfrm_send_acquire,
1235 .compile_policy = xfrm_compile_policy,
1236 .notify_policy = xfrm_send_policy_notify,
1237 };
1238
1239 static int __init xfrm_user_init(void)
1240 {
1241 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1242
1243 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv);
1244 if (xfrm_nl == NULL)
1245 return -ENOMEM;
1246
1247 xfrm_register_km(&netlink_mgr);
1248
1249 return 0;
1250 }
1251
1252 static void __exit xfrm_user_exit(void)
1253 {
1254 xfrm_unregister_km(&netlink_mgr);
1255 sock_release(xfrm_nl->sk_socket);
1256 }
1257
1258 module_init(xfrm_user_init);
1259 module_exit(xfrm_user_exit);
1260 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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