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[net-next-2.6.git] / net / xfrm / xfrm_user.c
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1da177e4
LT		 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
31static struct sock *xfrm_nl;
32
33static 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
70static 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
84static 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
154out:
155 return err;
156}
157
158static 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
185static 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
203static 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
216static 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
258error:
259 x->km.state = XFRM_STATE_DEAD;
260 xfrm_state_put(x);
261error_no_put:
262 *errp = err;
263 return NULL;
264}
265
266static 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
293static 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
313static 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
329struct 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
338static 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;
371out:
372 sp->this_idx++;
373 return 0;
374
375nlmsg_failure:
376rtattr_failure:
377 skb_trim(skb, b - skb->data);
378 return -1;
379}
380
381static 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
397static 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
422static 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);
442out_noput:
443 return err;
444}
445
446static 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
469static 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
522out:
523 xfrm_state_put(x);
524out_noput:
525 return err;
526}
527
528static 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
543static 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
583static 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
605static 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
624static 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
636static 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
650static 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
671static 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
698static 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
727rtattr_failure:
728 return -1;
729}
730
731static 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;
754out:
755 sp->this_idx++;
756 return 0;
757
758nlmsg_failure:
759 skb_trim(skb, b - skb->data);
760 return -1;
761}
762
763static 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
779static 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
805static 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
844static 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
852static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
853{
854 xfrm_policy_flush();
855 return 0;
856}
857
492b558b
TG		 858#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
859
860static 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),
1da177e4
LT		 875};
876
492b558b
TG		 877#undef XMSGSIZE
878
1da177e4
LT		 879static struct xfrm_link {
880 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
881 int (*dump)(struct sk_buff *, struct netlink_callback *);
492b558b
TG		 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 },
1da177e4
LT		 896};
897
898static int xfrm_done(struct netlink_callback *cb)
899{
900 return 0;
901}
902
903static 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
492b558b
TG		 931 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
932 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
933 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4
LT		 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
977err_einval:
978 *errp = -EINVAL;
979 return -1;
980}
981
982static 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
1009static void xfrm_netlink_rcv(struct sock *sk, int len)
1010{
1011 do {
1012 struct sk_buff *skb;
1013
1014 down(&xfrm_cfg_sem);
1015
1016 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
1017 if (xfrm_user_rcv_skb(skb)) {
1018 if (skb->len)
1019 skb_queue_head(&sk->sk_receive_queue,
1020 skb);
1021 else
1022 kfree_skb(skb);
1023 break;
1024 }
1025 kfree_skb(skb);
1026 }
1027
1028 up(&xfrm_cfg_sem);
1029
1030 } while (xfrm_nl && xfrm_nl->sk_receive_queue.qlen);
1031}
1032
1033static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
1034{
1035 struct xfrm_user_expire *ue;
1036 struct nlmsghdr *nlh;
1037 unsigned char *b = skb->tail;
1038
1039 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
1040 sizeof(*ue));
1041 ue = NLMSG_DATA(nlh);
1042 nlh->nlmsg_flags = 0;
1043
1044 copy_to_user_state(x, &ue->state);
1045 ue->hard = (hard != 0) ? 1 : 0;
1046
1047 nlh->nlmsg_len = skb->tail - b;
1048 return skb->len;
1049
1050nlmsg_failure:
1051 skb_trim(skb, b - skb->data);
1052 return -1;
1053}
1054
1055static int xfrm_send_state_notify(struct xfrm_state *x, int hard)
1056{
1057 struct sk_buff *skb;
1058
1059 skb = alloc_skb(sizeof(struct xfrm_user_expire) + 16, GFP_ATOMIC);
1060 if (skb == NULL)
1061 return -ENOMEM;
1062
1063 if (build_expire(skb, x, hard) < 0)
1064 BUG();
1065
1066 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1067
1068 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1069}
1070
1071static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1072 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1073 int dir)
1074{
1075 struct xfrm_user_acquire *ua;
1076 struct nlmsghdr *nlh;
1077 unsigned char *b = skb->tail;
1078 __u32 seq = xfrm_get_acqseq();
1079
1080 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1081 sizeof(*ua));
1082 ua = NLMSG_DATA(nlh);
1083 nlh->nlmsg_flags = 0;
1084
1085 memcpy(&ua->id, &x->id, sizeof(ua->id));
1086 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1087 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1088 copy_to_user_policy(xp, &ua->policy, dir);
1089 ua->aalgos = xt->aalgos;
1090 ua->ealgos = xt->ealgos;
1091 ua->calgos = xt->calgos;
1092 ua->seq = x->km.seq = seq;
1093
1094 if (copy_to_user_tmpl(xp, skb) < 0)
1095 goto nlmsg_failure;
1096
1097 nlh->nlmsg_len = skb->tail - b;
1098 return skb->len;
1099
1100nlmsg_failure:
1101 skb_trim(skb, b - skb->data);
1102 return -1;
1103}
1104
1105static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1106 struct xfrm_policy *xp, int dir)
1107{
1108 struct sk_buff *skb;
1109 size_t len;
1110
1111 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1112 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1113 skb = alloc_skb(len, GFP_ATOMIC);
1114 if (skb == NULL)
1115 return -ENOMEM;
1116
1117 if (build_acquire(skb, x, xt, xp, dir) < 0)
1118 BUG();
1119
1120 NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE;
1121
1122 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC);
1123}
1124
1125/* User gives us xfrm_user_policy_info followed by an array of 0
1126 * or more templates.
1127 */
1128static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1129 u8 *data, int len, int *dir)
1130{
1131 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1132 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1133 struct xfrm_policy *xp;
1134 int nr;
1135
1136 switch (family) {
1137 case AF_INET:
1138 if (opt != IP_XFRM_POLICY) {
1139 *dir = -EOPNOTSUPP;
1140 return NULL;
1141 }
1142 break;
1143#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1144 case AF_INET6:
1145 if (opt != IPV6_XFRM_POLICY) {
1146 *dir = -EOPNOTSUPP;
1147 return NULL;
1148 }
1149 break;
1150#endif
1151 default:
1152 *dir = -EINVAL;
1153 return NULL;
1154 }
1155
1156 *dir = -EINVAL;
1157
1158 if (len < sizeof(*p) ||
1159 verify_newpolicy_info(p))
1160 return NULL;
1161
1162 nr = ((len - sizeof(*p)) / sizeof(*ut));
1163 if (nr > XFRM_MAX_DEPTH)
1164 return NULL;
1165
1166 xp = xfrm_policy_alloc(GFP_KERNEL);
1167 if (xp == NULL) {
1168 *dir = -ENOBUFS;
1169 return NULL;
1170 }
1171
1172 copy_from_user_policy(xp, p);
1173 copy_templates(xp, ut, nr);
1174
1175 *dir = p->dir;
1176
1177 return xp;
1178}
1179
1180static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1181 int dir, int hard)
1182{
1183 struct xfrm_user_polexpire *upe;
1184 struct nlmsghdr *nlh;
1185 unsigned char *b = skb->tail;
1186
1187 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1188 upe = NLMSG_DATA(nlh);
1189 nlh->nlmsg_flags = 0;
1190
1191 copy_to_user_policy(xp, &upe->pol, dir);
1192 if (copy_to_user_tmpl(xp, skb) < 0)
1193 goto nlmsg_failure;
1194 upe->hard = !!hard;
1195
1196 nlh->nlmsg_len = skb->tail - b;
1197 return skb->len;
1198
1199nlmsg_failure:
1200 skb_trim(skb, b - skb->data);
1201 return -1;
1202}
1203
1204static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, int hard)
1205{
1206 struct sk_buff *skb;
1207 size_t len;
1208
1209 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1210 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1211 skb = alloc_skb(len, GFP_ATOMIC);
1212 if (skb == NULL)
1213 return -ENOMEM;
1214
1215 if (build_polexpire(skb, xp, dir, hard) < 0)
1216 BUG();
1217
1218 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1219
1220 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1221}
1222
1223static struct xfrm_mgr netlink_mgr = {
1224 .id = "netlink",
1225 .notify = xfrm_send_state_notify,
1226 .acquire = xfrm_send_acquire,
1227 .compile_policy = xfrm_compile_policy,
1228 .notify_policy = xfrm_send_policy_notify,
1229};
1230
1231static int __init xfrm_user_init(void)
1232{
1233 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1234
1235 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv);
1236 if (xfrm_nl == NULL)
1237 return -ENOMEM;
1238
1239 xfrm_register_km(&netlink_mgr);
1240
1241 return 0;
1242}
1243
1244static void __exit xfrm_user_exit(void)
1245{
1246 xfrm_unregister_km(&netlink_mgr);
1247 sock_release(xfrm_nl->sk_socket);
1248}
1249
1250module_init(xfrm_user_init);
1251module_exit(xfrm_user_exit);
1252MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree