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[NETLINK]: Generic netlink receive queue processor
[mirror_ubuntu-zesty-kernel.git] / net / xfrm / xfrm_user.c
CommitLineData
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;
31c26852 37 int len;
1da177e4
LT		 38
39 if (!rt)
40 return 0;
41
31c26852
HX		 42 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
43 if (len < 0)
1da177e4
LT		 44 return -EINVAL;
45
46 algp = RTA_DATA(rt);
31c26852
HX		 47
48 len -= (algp->alg_key_len + 7U) / 8;
49 if (len < 0)
50 return -EINVAL;
51
1da177e4
LT		 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
77static 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
91static 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
161out:
162 return err;
163}
164
165static 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;
b9e9dead 172 int len;
1da177e4
LT		 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
b9e9dead
HX		 184 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
185 p = kmalloc(len, GFP_KERNEL);
1da177e4
LT		 186 if (!p)
187 return -ENOMEM;
188
b9e9dead 189 memcpy(p, ualg, len);
1da177e4
LT		 190 *algpp = p;
191 return 0;
192}
193
194static 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
212static 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
225static 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
72cb6962 252 err = xfrm_init_state(x);
1da177e4
LT		 253 if (err)
254 goto error;
255
1da177e4
LT		 256 x->km.seq = p->seq;
257
258 return x;
259
260error:
261 x->km.state = XFRM_STATE_DEAD;
262 xfrm_state_put(x);
263error_no_put:
264 *errp = err;
265 return NULL;
266}
267
268static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
269{
270 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
271 struct xfrm_state *x;
272 int err;
26b15dad 273 struct km_event c;
1da177e4
LT		 274
275 err = verify_newsa_info(p, (struct rtattr **) xfrma);
276 if (err)
277 return err;
278
279 x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
280 if (!x)
281 return err;
282
26b15dad 283 xfrm_state_hold(x);
1da177e4
LT		 284 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
285 err = xfrm_state_add(x);
286 else
287 err = xfrm_state_update(x);
288
289 if (err < 0) {
290 x->km.state = XFRM_STATE_DEAD;
291 xfrm_state_put(x);
7d6dfe1f 292 goto out;
1da177e4
LT		 293 }
294
26b15dad
JHS		 295 c.seq = nlh->nlmsg_seq;
296 c.pid = nlh->nlmsg_pid;
f60f6b8f 297 c.event = nlh->nlmsg_type;
26b15dad
JHS		 298
299 km_state_notify(x, &c);
7d6dfe1f 300out:
26b15dad 301 xfrm_state_put(x);
1da177e4
LT		 302 return err;
303}
304
305static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
306{
307 struct xfrm_state *x;
26b15dad
JHS		 308 int err;
309 struct km_event c;
1da177e4
LT		 310 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
311
312 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
313 if (x == NULL)
314 return -ESRCH;
315
316 if (xfrm_state_kern(x)) {
317 xfrm_state_put(x);
318 return -EPERM;
319 }
320
26b15dad
JHS		 321 err = xfrm_state_delete(x);
322 if (err < 0) {
323 xfrm_state_put(x);
324 return err;
325 }
326
327 c.seq = nlh->nlmsg_seq;
328 c.pid = nlh->nlmsg_pid;
f60f6b8f 329 c.event = nlh->nlmsg_type;
26b15dad 330 km_state_notify(x, &c);
1da177e4
LT		 331 xfrm_state_put(x);
332
26b15dad 333 return err;
1da177e4
LT		 334}
335
336static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
337{
338 memcpy(&p->id, &x->id, sizeof(p->id));
339 memcpy(&p->sel, &x->sel, sizeof(p->sel));
340 memcpy(&p->lft, &x->lft, sizeof(p->lft));
341 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
342 memcpy(&p->stats, &x->stats, sizeof(p->stats));
343 p->saddr = x->props.saddr;
344 p->mode = x->props.mode;
345 p->replay_window = x->props.replay_window;
346 p->reqid = x->props.reqid;
347 p->family = x->props.family;
348 p->flags = x->props.flags;
349 p->seq = x->km.seq;
350}
351
352struct xfrm_dump_info {
353 struct sk_buff *in_skb;
354 struct sk_buff *out_skb;
355 u32 nlmsg_seq;
356 u16 nlmsg_flags;
357 int start_idx;
358 int this_idx;
359};
360
361static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
362{
363 struct xfrm_dump_info *sp = ptr;
364 struct sk_buff *in_skb = sp->in_skb;
365 struct sk_buff *skb = sp->out_skb;
366 struct xfrm_usersa_info *p;
367 struct nlmsghdr *nlh;
368 unsigned char *b = skb->tail;
369
370 if (sp->this_idx < sp->start_idx)
371 goto out;
372
373 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
374 sp->nlmsg_seq,
375 XFRM_MSG_NEWSA, sizeof(*p));
376 nlh->nlmsg_flags = sp->nlmsg_flags;
377
378 p = NLMSG_DATA(nlh);
379 copy_to_user_state(x, p);
380
381 if (x->aalg)
382 RTA_PUT(skb, XFRMA_ALG_AUTH,
383 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
384 if (x->ealg)
385 RTA_PUT(skb, XFRMA_ALG_CRYPT,
386 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
387 if (x->calg)
388 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
389
390 if (x->encap)
391 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
392
393 nlh->nlmsg_len = skb->tail - b;
394out:
395 sp->this_idx++;
396 return 0;
397
398nlmsg_failure:
399rtattr_failure:
400 skb_trim(skb, b - skb->data);
401 return -1;
402}
403
404static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
405{
406 struct xfrm_dump_info info;
407
408 info.in_skb = cb->skb;
409 info.out_skb = skb;
410 info.nlmsg_seq = cb->nlh->nlmsg_seq;
411 info.nlmsg_flags = NLM_F_MULTI;
412 info.this_idx = 0;
413 info.start_idx = cb->args[0];
414 (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
415 cb->args[0] = info.this_idx;
416
417 return skb->len;
418}
419
420static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
421 struct xfrm_state *x, u32 seq)
422{
423 struct xfrm_dump_info info;
424 struct sk_buff *skb;
425
426 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
427 if (!skb)
428 return ERR_PTR(-ENOMEM);
429
430 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
431 info.in_skb = in_skb;
432 info.out_skb = skb;
433 info.nlmsg_seq = seq;
434 info.nlmsg_flags = 0;
435 info.this_idx = info.start_idx = 0;
436
437 if (dump_one_state(x, 0, &info)) {
438 kfree_skb(skb);
439 return NULL;
440 }
441
442 return skb;
443}
444
445static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
446{
447 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
448 struct xfrm_state *x;
449 struct sk_buff *resp_skb;
450 int err;
451
452 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
453 err = -ESRCH;
454 if (x == NULL)
455 goto out_noput;
456
457 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
458 if (IS_ERR(resp_skb)) {
459 err = PTR_ERR(resp_skb);
460 } else {
461 err = netlink_unicast(xfrm_nl, resp_skb,
462 NETLINK_CB(skb).pid, MSG_DONTWAIT);
463 }
464 xfrm_state_put(x);
465out_noput:
466 return err;
467}
468
469static int verify_userspi_info(struct xfrm_userspi_info *p)
470{
471 switch (p->info.id.proto) {
472 case IPPROTO_AH:
473 case IPPROTO_ESP:
474 break;
475
476 case IPPROTO_COMP:
477 /* IPCOMP spi is 16-bits. */
478 if (p->max >= 0x10000)
479 return -EINVAL;
480 break;
481
482 default:
483 return -EINVAL;
484 };
485
486 if (p->min > p->max)
487 return -EINVAL;
488
489 return 0;
490}
491
492static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
493{
494 struct xfrm_state *x;
495 struct xfrm_userspi_info *p;
496 struct sk_buff *resp_skb;
497 xfrm_address_t *daddr;
498 int family;
499 int err;
500
501 p = NLMSG_DATA(nlh);
502 err = verify_userspi_info(p);
503 if (err)
504 goto out_noput;
505
506 family = p->info.family;
507 daddr = &p->info.id.daddr;
508
509 x = NULL;
510 if (p->info.seq) {
511 x = xfrm_find_acq_byseq(p->info.seq);
512 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
513 xfrm_state_put(x);
514 x = NULL;
515 }
516 }
517
518 if (!x)
519 x = xfrm_find_acq(p->info.mode, p->info.reqid,
520 p->info.id.proto, daddr,
521 &p->info.saddr, 1,
522 family);
523 err = -ENOENT;
524 if (x == NULL)
525 goto out_noput;
526
527 resp_skb = ERR_PTR(-ENOENT);
528
529 spin_lock_bh(&x->lock);
530 if (x->km.state != XFRM_STATE_DEAD) {
531 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
532 if (x->id.spi)
533 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
534 }
535 spin_unlock_bh(&x->lock);
536
537 if (IS_ERR(resp_skb)) {
538 err = PTR_ERR(resp_skb);
539 goto out;
540 }
541
542 err = netlink_unicast(xfrm_nl, resp_skb,
543 NETLINK_CB(skb).pid, MSG_DONTWAIT);
544
545out:
546 xfrm_state_put(x);
547out_noput:
548 return err;
549}
550
551static int verify_policy_dir(__u8 dir)
552{
553 switch (dir) {
554 case XFRM_POLICY_IN:
555 case XFRM_POLICY_OUT:
556 case XFRM_POLICY_FWD:
557 break;
558
559 default:
560 return -EINVAL;
561 };
562
563 return 0;
564}
565
566static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
567{
568 switch (p->share) {
569 case XFRM_SHARE_ANY:
570 case XFRM_SHARE_SESSION:
571 case XFRM_SHARE_USER:
572 case XFRM_SHARE_UNIQUE:
573 break;
574
575 default:
576 return -EINVAL;
577 };
578
579 switch (p->action) {
580 case XFRM_POLICY_ALLOW:
581 case XFRM_POLICY_BLOCK:
582 break;
583
584 default:
585 return -EINVAL;
586 };
587
588 switch (p->sel.family) {
589 case AF_INET:
590 break;
591
592 case AF_INET6:
593#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
594 break;
595#else
596 return -EAFNOSUPPORT;
597#endif
598
599 default:
600 return -EINVAL;
601 };
602
603 return verify_policy_dir(p->dir);
604}
605
606static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
607 int nr)
608{
609 int i;
610
611 xp->xfrm_nr = nr;
612 for (i = 0; i < nr; i++, ut++) {
613 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
614
615 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
616 memcpy(&t->saddr, &ut->saddr,
617 sizeof(xfrm_address_t));
618 t->reqid = ut->reqid;
619 t->mode = ut->mode;
620 t->share = ut->share;
621 t->optional = ut->optional;
622 t->aalgos = ut->aalgos;
623 t->ealgos = ut->ealgos;
624 t->calgos = ut->calgos;
625 }
626}
627
628static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
629{
630 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
631 struct xfrm_user_tmpl *utmpl;
632 int nr;
633
634 if (!rt) {
635 pol->xfrm_nr = 0;
636 } else {
637 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
638
639 if (nr > XFRM_MAX_DEPTH)
640 return -EINVAL;
641
642 copy_templates(pol, RTA_DATA(rt), nr);
643 }
644 return 0;
645}
646
647static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
648{
649 xp->priority = p->priority;
650 xp->index = p->index;
651 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
652 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
653 xp->action = p->action;
654 xp->flags = p->flags;
655 xp->family = p->sel.family;
656 /* XXX xp->share = p->share; */
657}
658
659static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
660{
661 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
662 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
663 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
664 p->priority = xp->priority;
665 p->index = xp->index;
666 p->sel.family = xp->family;
667 p->dir = dir;
668 p->action = xp->action;
669 p->flags = xp->flags;
670 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
671}
672
673static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
674{
675 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
676 int err;
677
678 if (!xp) {
679 *errp = -ENOMEM;
680 return NULL;
681 }
682
683 copy_from_user_policy(xp, p);
684 err = copy_from_user_tmpl(xp, xfrma);
685 if (err) {
686 *errp = err;
687 kfree(xp);
688 xp = NULL;
689 }
690
691 return xp;
692}
693
694static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
695{
696 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
697 struct xfrm_policy *xp;
26b15dad 698 struct km_event c;
1da177e4
LT		 699 int err;
700 int excl;
701
702 err = verify_newpolicy_info(p);
703 if (err)
704 return err;
705
706 xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
707 if (!xp)
708 return err;
709
26b15dad
JHS		 710 /* shouldnt excl be based on nlh flags??
711 * Aha! this is anti-netlink really i.e more pfkey derived
712 * in netlink excl is a flag and you wouldnt need
713 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 714 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
715 err = xfrm_policy_insert(p->dir, xp, excl);
716 if (err) {
717 kfree(xp);
718 return err;
719 }
720
f60f6b8f 721 c.event = nlh->nlmsg_type;
26b15dad
JHS		 722 c.seq = nlh->nlmsg_seq;
723 c.pid = nlh->nlmsg_pid;
724 km_policy_notify(xp, p->dir, &c);
725
1da177e4
LT		 726 xfrm_pol_put(xp);
727
728 return 0;
729}
730
731static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
732{
733 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
734 int i;
735
736 if (xp->xfrm_nr == 0)
737 return 0;
738
739 for (i = 0; i < xp->xfrm_nr; i++) {
740 struct xfrm_user_tmpl *up = &vec[i];
741 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
742
743 memcpy(&up->id, &kp->id, sizeof(up->id));
744 up->family = xp->family;
745 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
746 up->reqid = kp->reqid;
747 up->mode = kp->mode;
748 up->share = kp->share;
749 up->optional = kp->optional;
750 up->aalgos = kp->aalgos;
751 up->ealgos = kp->ealgos;
752 up->calgos = kp->calgos;
753 }
754 RTA_PUT(skb, XFRMA_TMPL,
755 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
756 vec);
757
758 return 0;
759
760rtattr_failure:
761 return -1;
762}
763
764static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
765{
766 struct xfrm_dump_info *sp = ptr;
767 struct xfrm_userpolicy_info *p;
768 struct sk_buff *in_skb = sp->in_skb;
769 struct sk_buff *skb = sp->out_skb;
770 struct nlmsghdr *nlh;
771 unsigned char *b = skb->tail;
772
773 if (sp->this_idx < sp->start_idx)
774 goto out;
775
776 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
777 sp->nlmsg_seq,
778 XFRM_MSG_NEWPOLICY, sizeof(*p));
779 p = NLMSG_DATA(nlh);
780 nlh->nlmsg_flags = sp->nlmsg_flags;
781
782 copy_to_user_policy(xp, p, dir);
783 if (copy_to_user_tmpl(xp, skb) < 0)
784 goto nlmsg_failure;
785
786 nlh->nlmsg_len = skb->tail - b;
787out:
788 sp->this_idx++;
789 return 0;
790
791nlmsg_failure:
792 skb_trim(skb, b - skb->data);
793 return -1;
794}
795
796static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
797{
798 struct xfrm_dump_info info;
799
800 info.in_skb = cb->skb;
801 info.out_skb = skb;
802 info.nlmsg_seq = cb->nlh->nlmsg_seq;
803 info.nlmsg_flags = NLM_F_MULTI;
804 info.this_idx = 0;
805 info.start_idx = cb->args[0];
806 (void) xfrm_policy_walk(dump_one_policy, &info);
807 cb->args[0] = info.this_idx;
808
809 return skb->len;
810}
811
812static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
813 struct xfrm_policy *xp,
814 int dir, u32 seq)
815{
816 struct xfrm_dump_info info;
817 struct sk_buff *skb;
818
819 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
820 if (!skb)
821 return ERR_PTR(-ENOMEM);
822
823 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
824 info.in_skb = in_skb;
825 info.out_skb = skb;
826 info.nlmsg_seq = seq;
827 info.nlmsg_flags = 0;
828 info.this_idx = info.start_idx = 0;
829
830 if (dump_one_policy(xp, dir, 0, &info) < 0) {
831 kfree_skb(skb);
832 return NULL;
833 }
834
835 return skb;
836}
837
838static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
839{
840 struct xfrm_policy *xp;
841 struct xfrm_userpolicy_id *p;
842 int err;
26b15dad 843 struct km_event c;
1da177e4
LT		 844 int delete;
845
846 p = NLMSG_DATA(nlh);
847 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
848
849 err = verify_policy_dir(p->dir);
850 if (err)
851 return err;
852
853 if (p->index)
854 xp = xfrm_policy_byid(p->dir, p->index, delete);
855 else
856 xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
857 if (xp == NULL)
858 return -ENOENT;
859
860 if (!delete) {
861 struct sk_buff *resp_skb;
862
863 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
864 if (IS_ERR(resp_skb)) {
865 err = PTR_ERR(resp_skb);
866 } else {
867 err = netlink_unicast(xfrm_nl, resp_skb,
868 NETLINK_CB(skb).pid,
869 MSG_DONTWAIT);
870 }
26b15dad 871 } else {
e7443892 872 c.data.byid = p->index;
f60f6b8f 873 c.event = nlh->nlmsg_type;
26b15dad
JHS		 874 c.seq = nlh->nlmsg_seq;
875 c.pid = nlh->nlmsg_pid;
876 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 877 }
878
879 xfrm_pol_put(xp);
880
881 return err;
882}
883
884static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
885{
26b15dad 886 struct km_event c;
1da177e4
LT		 887 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
888
889 xfrm_state_flush(p->proto);
bf08867f 890 c.data.proto = p->proto;
f60f6b8f 891 c.event = nlh->nlmsg_type;
26b15dad
JHS		 892 c.seq = nlh->nlmsg_seq;
893 c.pid = nlh->nlmsg_pid;
894 km_state_notify(NULL, &c);
895
1da177e4
LT		 896 return 0;
897}
898
899static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
900{
26b15dad
JHS		 901 struct km_event c;
902
1da177e4 903 xfrm_policy_flush();
f60f6b8f 904 c.event = nlh->nlmsg_type;
26b15dad
JHS		 905 c.seq = nlh->nlmsg_seq;
906 c.pid = nlh->nlmsg_pid;
907 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 908 return 0;
909}
910
492b558b
TG		 911#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
912
913static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
914 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
915 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
916 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
917 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
918 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
919 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
920 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
921 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
922 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
923 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
924 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
925 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
926 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
927 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1da177e4
LT		 928};
929
492b558b
TG		 930#undef XMSGSIZE
931
1da177e4
LT		 932static struct xfrm_link {
933 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
934 int (*dump)(struct sk_buff *, struct netlink_callback *);
492b558b
TG		 935} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
936 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
937 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
938 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
939 .dump = xfrm_dump_sa },
940 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
941 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
942 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
943 .dump = xfrm_dump_policy },
944 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
945 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
946 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
947 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
948 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1da177e4
LT		 949};
950
1da177e4
LT		 951static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
952{
953 struct rtattr *xfrma[XFRMA_MAX];
954 struct xfrm_link *link;
955 int type, min_len;
956
957 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
958 return 0;
959
960 type = nlh->nlmsg_type;
961
962 /* A control message: ignore them */
963 if (type < XFRM_MSG_BASE)
964 return 0;
965
966 /* Unknown message: reply with EINVAL */
967 if (type > XFRM_MSG_MAX)
968 goto err_einval;
969
970 type -= XFRM_MSG_BASE;
971 link = &xfrm_dispatch[type];
972
973 /* All operations require privileges, even GET */
974 if (security_netlink_recv(skb)) {
975 *errp = -EPERM;
976 return -1;
977 }
978
492b558b
TG		 979 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
980 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
981 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4
LT		 982 u32 rlen;
983
984 if (link->dump == NULL)
985 goto err_einval;
986
987 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
a8f74b22 988 link->dump, NULL)) != 0) {
1da177e4
LT		 989 return -1;
990 }
991 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
992 if (rlen > skb->len)
993 rlen = skb->len;
994 skb_pull(skb, rlen);
995 return -1;
996 }
997
998 memset(xfrma, 0, sizeof(xfrma));
999
1000 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1001 goto err_einval;
1002
1003 if (nlh->nlmsg_len > min_len) {
1004 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1005 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1006
1007 while (RTA_OK(attr, attrlen)) {
1008 unsigned short flavor = attr->rta_type;
1009 if (flavor) {
1010 if (flavor > XFRMA_MAX)
1011 goto err_einval;
1012 xfrma[flavor - 1] = attr;
1013 }
1014 attr = RTA_NEXT(attr, attrlen);
1015 }
1016 }
1017
1018 if (link->doit == NULL)
1019 goto err_einval;
1020 *errp = link->doit(skb, nlh, (void **) &xfrma);
1021
1022 return *errp;
1023
1024err_einval:
1025 *errp = -EINVAL;
1026 return -1;
1027}
1028
1029static int xfrm_user_rcv_skb(struct sk_buff *skb)
1030{
1031 int err;
1032 struct nlmsghdr *nlh;
1033
1034 while (skb->len >= NLMSG_SPACE(0)) {
1035 u32 rlen;
1036
1037 nlh = (struct nlmsghdr *) skb->data;
1038 if (nlh->nlmsg_len < sizeof(*nlh) ||
1039 skb->len < nlh->nlmsg_len)
1040 return 0;
1041 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1042 if (rlen > skb->len)
1043 rlen = skb->len;
1044 if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
1045 if (err == 0)
1046 return -1;
1047 netlink_ack(skb, nlh, err);
1048 } else if (nlh->nlmsg_flags & NLM_F_ACK)
1049 netlink_ack(skb, nlh, 0);
1050 skb_pull(skb, rlen);
1051 }
1052
1053 return 0;
1054}
1055
1056static void xfrm_netlink_rcv(struct sock *sk, int len)
1057{
2a0a6ebe
HX		 1058 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
1059
1da177e4
LT		 1060 do {
1061 struct sk_buff *skb;
1062
1063 down(&xfrm_cfg_sem);
1064
2a0a6ebe
HX		 1065 if (qlen > skb_queue_len(&sk->sk_receive_queue))
1066 qlen = skb_queue_len(&sk->sk_receive_queue);
1067
09e14305 1068 for (; qlen; qlen--) {
2a0a6ebe 1069 skb = skb_dequeue(&sk->sk_receive_queue);
1da177e4 1070 if (xfrm_user_rcv_skb(skb)) {
09e14305 1071 if (skb->len)
1da177e4
LT		 1072 skb_queue_head(&sk->sk_receive_queue,
1073 skb);
0f4821e7 1074 else {
1da177e4 1075 kfree_skb(skb);
0f4821e7
DM		 1076 qlen--;
1077 }
1da177e4
LT		 1078 break;
1079 }
1080 kfree_skb(skb);
1081 }
1082
1083 up(&xfrm_cfg_sem);
1084
2a0a6ebe 1085 } while (qlen);
1da177e4
LT		 1086}
1087
1088static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
1089{
1090 struct xfrm_user_expire *ue;
1091 struct nlmsghdr *nlh;
1092 unsigned char *b = skb->tail;
1093
1094 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
1095 sizeof(*ue));
1096 ue = NLMSG_DATA(nlh);
1097 nlh->nlmsg_flags = 0;
1098
1099 copy_to_user_state(x, &ue->state);
1100 ue->hard = (hard != 0) ? 1 : 0;
1101
1102 nlh->nlmsg_len = skb->tail - b;
1103 return skb->len;
1104
1105nlmsg_failure:
1106 skb_trim(skb, b - skb->data);
1107 return -1;
1108}
1109
26b15dad 1110static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 1111{
1112 struct sk_buff *skb;
ee57eef9 1113 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1da177e4 1114
ee57eef9 1115 skb = alloc_skb(len, GFP_ATOMIC);
1da177e4
LT		 1116 if (skb == NULL)
1117 return -ENOMEM;
1118
bf08867f 1119 if (build_expire(skb, x, c->data.hard) < 0)
1da177e4
LT		 1120 BUG();
1121
ac6d439d
PM		 1122 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1123 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 1124}
1125
26b15dad
JHS		 1126static int xfrm_notify_sa_flush(struct km_event *c)
1127{
1128 struct xfrm_usersa_flush *p;
1129 struct nlmsghdr *nlh;
1130 struct sk_buff *skb;
1131 unsigned char *b;
1132 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1133
1134 skb = alloc_skb(len, GFP_ATOMIC);
1135 if (skb == NULL)
1136 return -ENOMEM;
1137 b = skb->tail;
1138
1139 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1140 XFRM_MSG_FLUSHSA, sizeof(*p));
1141 nlh->nlmsg_flags = 0;
1142
1143 p = NLMSG_DATA(nlh);
bf08867f 1144 p->proto = c->data.proto;
26b15dad
JHS		 1145
1146 nlh->nlmsg_len = skb->tail - b;
1147
ac6d439d
PM		 1148 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1149 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 1150
1151nlmsg_failure:
1152 kfree_skb(skb);
1153 return -1;
1154}
1155
1156static int inline xfrm_sa_len(struct xfrm_state *x)
1157{
0603eac0 1158 int l = 0;
26b15dad
JHS		 1159 if (x->aalg)
1160 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1161 if (x->ealg)
1162 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1163 if (x->calg)
1164 l += RTA_SPACE(sizeof(*x->calg));
1165 if (x->encap)
1166 l += RTA_SPACE(sizeof(*x->encap));
1167
1168 return l;
1169}
1170
1171static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1172{
1173 struct xfrm_usersa_info *p;
0603eac0 1174 struct xfrm_usersa_id *id;
26b15dad
JHS		 1175 struct nlmsghdr *nlh;
1176 struct sk_buff *skb;
26b15dad
JHS		 1177 unsigned char *b;
1178 int len = xfrm_sa_len(x);
0603eac0
HX		 1179 int headlen;
1180
1181 headlen = sizeof(*p);
1182 if (c->event == XFRM_MSG_DELSA) {
1183 len += RTA_SPACE(headlen);
1184 headlen = sizeof(*id);
1185 }
1186 len += NLMSG_SPACE(headlen);
26b15dad
JHS		 1187
1188 skb = alloc_skb(len, GFP_ATOMIC);
1189 if (skb == NULL)
1190 return -ENOMEM;
1191 b = skb->tail;
1192
0603eac0 1193 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
26b15dad
JHS		 1194 nlh->nlmsg_flags = 0;
1195
1196 p = NLMSG_DATA(nlh);
0603eac0
HX		 1197 if (c->event == XFRM_MSG_DELSA) {
1198 id = NLMSG_DATA(nlh);
1199 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1200 id->spi = x->id.spi;
1201 id->family = x->props.family;
1202 id->proto = x->id.proto;
1203
1204 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1205 }
1206
26b15dad
JHS		 1207 copy_to_user_state(x, p);
1208
1209 if (x->aalg)
1210 RTA_PUT(skb, XFRMA_ALG_AUTH,
1211 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1212 if (x->ealg)
1213 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1214 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1215 if (x->calg)
1216 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1217
1218 if (x->encap)
1219 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1220
1221 nlh->nlmsg_len = skb->tail - b;
1222
ac6d439d
PM		 1223 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1224 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 1225
1226nlmsg_failure:
1227rtattr_failure:
1228 kfree_skb(skb);
1229 return -1;
1230}
1231
1232static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1233{
1234
1235 switch (c->event) {
f60f6b8f 1236 case XFRM_MSG_EXPIRE:
26b15dad 1237 return xfrm_exp_state_notify(x, c);
f60f6b8f
HX		 1238 case XFRM_MSG_DELSA:
1239 case XFRM_MSG_UPDSA:
1240 case XFRM_MSG_NEWSA:
26b15dad 1241 return xfrm_notify_sa(x, c);
f60f6b8f 1242 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 1243 return xfrm_notify_sa_flush(c);
1244 default:
1245 printk("xfrm_user: Unknown SA event %d\n", c->event);
1246 break;
1247 }
1248
1249 return 0;
1250
1251}
1252
1da177e4
LT		 1253static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1254 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1255 int dir)
1256{
1257 struct xfrm_user_acquire *ua;
1258 struct nlmsghdr *nlh;
1259 unsigned char *b = skb->tail;
1260 __u32 seq = xfrm_get_acqseq();
1261
1262 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1263 sizeof(*ua));
1264 ua = NLMSG_DATA(nlh);
1265 nlh->nlmsg_flags = 0;
1266
1267 memcpy(&ua->id, &x->id, sizeof(ua->id));
1268 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1269 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1270 copy_to_user_policy(xp, &ua->policy, dir);
1271 ua->aalgos = xt->aalgos;
1272 ua->ealgos = xt->ealgos;
1273 ua->calgos = xt->calgos;
1274 ua->seq = x->km.seq = seq;
1275
1276 if (copy_to_user_tmpl(xp, skb) < 0)
1277 goto nlmsg_failure;
1278
1279 nlh->nlmsg_len = skb->tail - b;
1280 return skb->len;
1281
1282nlmsg_failure:
1283 skb_trim(skb, b - skb->data);
1284 return -1;
1285}
1286
1287static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1288 struct xfrm_policy *xp, int dir)
1289{
1290 struct sk_buff *skb;
1291 size_t len;
1292
1293 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1294 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1295 skb = alloc_skb(len, GFP_ATOMIC);
1296 if (skb == NULL)
1297 return -ENOMEM;
1298
1299 if (build_acquire(skb, x, xt, xp, dir) < 0)
1300 BUG();
1301
ac6d439d
PM		 1302 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
1303 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 1304}
1305
1306/* User gives us xfrm_user_policy_info followed by an array of 0
1307 * or more templates.
1308 */
1309static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1310 u8 *data, int len, int *dir)
1311{
1312 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1313 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1314 struct xfrm_policy *xp;
1315 int nr;
1316
1317 switch (family) {
1318 case AF_INET:
1319 if (opt != IP_XFRM_POLICY) {
1320 *dir = -EOPNOTSUPP;
1321 return NULL;
1322 }
1323 break;
1324#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1325 case AF_INET6:
1326 if (opt != IPV6_XFRM_POLICY) {
1327 *dir = -EOPNOTSUPP;
1328 return NULL;
1329 }
1330 break;
1331#endif
1332 default:
1333 *dir = -EINVAL;
1334 return NULL;
1335 }
1336
1337 *dir = -EINVAL;
1338
1339 if (len < sizeof(*p) ||
1340 verify_newpolicy_info(p))
1341 return NULL;
1342
1343 nr = ((len - sizeof(*p)) / sizeof(*ut));
1344 if (nr > XFRM_MAX_DEPTH)
1345 return NULL;
1346
a4f1bac6
HX		 1347 if (p->dir > XFRM_POLICY_OUT)
1348 return NULL;
1349
1da177e4
LT		 1350 xp = xfrm_policy_alloc(GFP_KERNEL);
1351 if (xp == NULL) {
1352 *dir = -ENOBUFS;
1353 return NULL;
1354 }
1355
1356 copy_from_user_policy(xp, p);
1357 copy_templates(xp, ut, nr);
1358
1359 *dir = p->dir;
1360
1361 return xp;
1362}
1363
1364static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1365 int dir, int hard)
1366{
1367 struct xfrm_user_polexpire *upe;
1368 struct nlmsghdr *nlh;
1369 unsigned char *b = skb->tail;
1370
1371 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1372 upe = NLMSG_DATA(nlh);
1373 nlh->nlmsg_flags = 0;
1374
1375 copy_to_user_policy(xp, &upe->pol, dir);
1376 if (copy_to_user_tmpl(xp, skb) < 0)
1377 goto nlmsg_failure;
1378 upe->hard = !!hard;
1379
1380 nlh->nlmsg_len = skb->tail - b;
1381 return skb->len;
1382
1383nlmsg_failure:
1384 skb_trim(skb, b - skb->data);
1385 return -1;
1386}
1387
26b15dad 1388static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1da177e4
LT		 1389{
1390 struct sk_buff *skb;
1391 size_t len;
1392
1393 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1394 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1395 skb = alloc_skb(len, GFP_ATOMIC);
1396 if (skb == NULL)
1397 return -ENOMEM;
1398
bf08867f 1399 if (build_polexpire(skb, xp, dir, c->data.hard) < 0)
1da177e4
LT		 1400 BUG();
1401
ac6d439d
PM		 1402 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1403 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 1404}
1405
26b15dad
JHS		 1406static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1407{
1408 struct xfrm_userpolicy_info *p;
0603eac0 1409 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 1410 struct nlmsghdr *nlh;
1411 struct sk_buff *skb;
26b15dad
JHS		 1412 unsigned char *b;
1413 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
0603eac0
HX		 1414 int headlen;
1415
1416 headlen = sizeof(*p);
1417 if (c->event == XFRM_MSG_DELPOLICY) {
1418 len += RTA_SPACE(headlen);
1419 headlen = sizeof(*id);
1420 }
1421 len += NLMSG_SPACE(headlen);
26b15dad
JHS		 1422
1423 skb = alloc_skb(len, GFP_ATOMIC);
1424 if (skb == NULL)
1425 return -ENOMEM;
1426 b = skb->tail;
1427
0603eac0 1428 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
26b15dad
JHS		 1429
1430 p = NLMSG_DATA(nlh);
0603eac0
HX		 1431 if (c->event == XFRM_MSG_DELPOLICY) {
1432 id = NLMSG_DATA(nlh);
1433 memset(id, 0, sizeof(*id));
1434 id->dir = dir;
1435 if (c->data.byid)
1436 id->index = xp->index;
1437 else
1438 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
1439
1440 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
1441 }
26b15dad
JHS		 1442
1443 nlh->nlmsg_flags = 0;
1444
1445 copy_to_user_policy(xp, p, dir);
1446 if (copy_to_user_tmpl(xp, skb) < 0)
1447 goto nlmsg_failure;
1448
1449 nlh->nlmsg_len = skb->tail - b;
1450
ac6d439d
PM		 1451 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
1452 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 1453
1454nlmsg_failure:
0603eac0 1455rtattr_failure:
26b15dad
JHS		 1456 kfree_skb(skb);
1457 return -1;
1458}
1459
1460static int xfrm_notify_policy_flush(struct km_event *c)
1461{
1462 struct nlmsghdr *nlh;
1463 struct sk_buff *skb;
1464 unsigned char *b;
1465 int len = NLMSG_LENGTH(0);
1466
1467 skb = alloc_skb(len, GFP_ATOMIC);
1468 if (skb == NULL)
1469 return -ENOMEM;
1470 b = skb->tail;
1471
1472
1473 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
1474
1475 nlh->nlmsg_len = skb->tail - b;
1476
ac6d439d
PM		 1477 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
1478 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 1479
1480nlmsg_failure:
1481 kfree_skb(skb);
1482 return -1;
1483}
1484
1485static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1486{
1487
1488 switch (c->event) {
f60f6b8f
HX		 1489 case XFRM_MSG_NEWPOLICY:
1490 case XFRM_MSG_UPDPOLICY:
1491 case XFRM_MSG_DELPOLICY:
26b15dad 1492 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 1493 case XFRM_MSG_FLUSHPOLICY:
26b15dad 1494 return xfrm_notify_policy_flush(c);
f60f6b8f 1495 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 1496 return xfrm_exp_policy_notify(xp, dir, c);
1497 default:
1498 printk("xfrm_user: Unknown Policy event %d\n", c->event);
1499 }
1500
1501 return 0;
1502
1503}
1504
1da177e4
LT		 1505static struct xfrm_mgr netlink_mgr = {
1506 .id = "netlink",
1507 .notify = xfrm_send_state_notify,
1508 .acquire = xfrm_send_acquire,
1509 .compile_policy = xfrm_compile_policy,
1510 .notify_policy = xfrm_send_policy_notify,
1511};
1512
1513static int __init xfrm_user_init(void)
1514{
1515 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1516
06628607
PM		 1517 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
1518 xfrm_netlink_rcv, THIS_MODULE);
1da177e4
LT		 1519 if (xfrm_nl == NULL)
1520 return -ENOMEM;
1521
1522 xfrm_register_km(&netlink_mgr);
1523
1524 return 0;
1525}
1526
1527static void __exit xfrm_user_exit(void)
1528{
1529 xfrm_unregister_km(&netlink_mgr);
1530 sock_release(xfrm_nl->sk_socket);
1531}
1532
1533module_init(xfrm_user_init);
1534module_exit(xfrm_user_exit);
1535MODULE_LICENSE("GPL");
4fdb3bb7 1536MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
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