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[DCCP]: Initial implementation
[mirror_ubuntu-jammy-kernel.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 int len;
38
39 if (!rt)
40 return 0;
41
42 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
43 if (len < 0)
44 return -EINVAL;
45
46 algp = RTA_DATA(rt);
47
48 len -= (algp->alg_key_len + 7U) / 8;
49 if (len < 0)
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 if (!algp->alg_key_len &&
55 strcmp(algp->alg_name, "digest_null") != 0)
56 return -EINVAL;
57 break;
58
59 case XFRMA_ALG_CRYPT:
60 if (!algp->alg_key_len &&
61 strcmp(algp->alg_name, "cipher_null") != 0)
62 return -EINVAL;
63 break;
64
65 case XFRMA_ALG_COMP:
66 /* Zero length keys are legal. */
67 break;
68
69 default:
70 return -EINVAL;
71 };
72
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 return 0;
75 }
76
77 static int verify_encap_tmpl(struct rtattr **xfrma)
78 {
79 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
80 struct xfrm_encap_tmpl *encap;
81
82 if (!rt)
83 return 0;
84
85 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
86 return -EINVAL;
87
88 return 0;
89 }
90
91 static int verify_newsa_info(struct xfrm_usersa_info *p,
92 struct rtattr **xfrma)
93 {
94 int err;
95
96 err = -EINVAL;
97 switch (p->family) {
98 case AF_INET:
99 break;
100
101 case AF_INET6:
102 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
103 break;
104 #else
105 err = -EAFNOSUPPORT;
106 goto out;
107 #endif
108
109 default:
110 goto out;
111 };
112
113 err = -EINVAL;
114 switch (p->id.proto) {
115 case IPPROTO_AH:
116 if (!xfrma[XFRMA_ALG_AUTH-1] ||
117 xfrma[XFRMA_ALG_CRYPT-1] ||
118 xfrma[XFRMA_ALG_COMP-1])
119 goto out;
120 break;
121
122 case IPPROTO_ESP:
123 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
124 !xfrma[XFRMA_ALG_CRYPT-1]) ||
125 xfrma[XFRMA_ALG_COMP-1])
126 goto out;
127 break;
128
129 case IPPROTO_COMP:
130 if (!xfrma[XFRMA_ALG_COMP-1] ||
131 xfrma[XFRMA_ALG_AUTH-1] ||
132 xfrma[XFRMA_ALG_CRYPT-1])
133 goto out;
134 break;
135
136 default:
137 goto out;
138 };
139
140 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
141 goto out;
142 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
143 goto out;
144 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
145 goto out;
146 if ((err = verify_encap_tmpl(xfrma)))
147 goto out;
148
149 err = -EINVAL;
150 switch (p->mode) {
151 case 0:
152 case 1:
153 break;
154
155 default:
156 goto out;
157 };
158
159 err = 0;
160
161 out:
162 return err;
163 }
164
165 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
166 struct xfrm_algo_desc *(*get_byname)(char *, int),
167 struct rtattr *u_arg)
168 {
169 struct rtattr *rta = u_arg;
170 struct xfrm_algo *p, *ualg;
171 struct xfrm_algo_desc *algo;
172 int len;
173
174 if (!rta)
175 return 0;
176
177 ualg = RTA_DATA(rta);
178
179 algo = get_byname(ualg->alg_name, 1);
180 if (!algo)
181 return -ENOSYS;
182 *props = algo->desc.sadb_alg_id;
183
184 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
185 p = kmalloc(len, GFP_KERNEL);
186 if (!p)
187 return -ENOMEM;
188
189 memcpy(p, ualg, len);
190 *algpp = p;
191 return 0;
192 }
193
194 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
195 {
196 struct rtattr *rta = u_arg;
197 struct xfrm_encap_tmpl *p, *uencap;
198
199 if (!rta)
200 return 0;
201
202 uencap = RTA_DATA(rta);
203 p = kmalloc(sizeof(*p), GFP_KERNEL);
204 if (!p)
205 return -ENOMEM;
206
207 memcpy(p, uencap, sizeof(*p));
208 *encapp = p;
209 return 0;
210 }
211
212 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
213 {
214 memcpy(&x->id, &p->id, sizeof(x->id));
215 memcpy(&x->sel, &p->sel, sizeof(x->sel));
216 memcpy(&x->lft, &p->lft, sizeof(x->lft));
217 x->props.mode = p->mode;
218 x->props.replay_window = p->replay_window;
219 x->props.reqid = p->reqid;
220 x->props.family = p->family;
221 x->props.saddr = p->saddr;
222 x->props.flags = p->flags;
223 }
224
225 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
226 struct rtattr **xfrma,
227 int *errp)
228 {
229 struct xfrm_state *x = xfrm_state_alloc();
230 int err = -ENOMEM;
231
232 if (!x)
233 goto error_no_put;
234
235 copy_from_user_state(x, p);
236
237 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
238 xfrm_aalg_get_byname,
239 xfrma[XFRMA_ALG_AUTH-1])))
240 goto error;
241 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
242 xfrm_ealg_get_byname,
243 xfrma[XFRMA_ALG_CRYPT-1])))
244 goto error;
245 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
246 xfrm_calg_get_byname,
247 xfrma[XFRMA_ALG_COMP-1])))
248 goto error;
249 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
250 goto error;
251
252 err = xfrm_init_state(x);
253 if (err)
254 goto error;
255
256 x->km.seq = p->seq;
257
258 return x;
259
260 error:
261 x->km.state = XFRM_STATE_DEAD;
262 xfrm_state_put(x);
263 error_no_put:
264 *errp = err;
265 return NULL;
266 }
267
268 static 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;
273 struct km_event c;
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
283 xfrm_state_hold(x);
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);
292 goto out;
293 }
294
295 c.seq = nlh->nlmsg_seq;
296 c.pid = nlh->nlmsg_pid;
297 c.event = nlh->nlmsg_type;
298
299 km_state_notify(x, &c);
300 out:
301 xfrm_state_put(x);
302 return err;
303 }
304
305 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
306 {
307 struct xfrm_state *x;
308 int err;
309 struct km_event c;
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
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;
329 c.event = nlh->nlmsg_type;
330 km_state_notify(x, &c);
331 xfrm_state_put(x);
332
333 return err;
334 }
335
336 static 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
352 struct 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
361 static 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;
394 out:
395 sp->this_idx++;
396 return 0;
397
398 nlmsg_failure:
399 rtattr_failure:
400 skb_trim(skb, b - skb->data);
401 return -1;
402 }
403
404 static 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
420 static 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
445 static 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);
465 out_noput:
466 return err;
467 }
468
469 static 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
492 static 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
545 out:
546 xfrm_state_put(x);
547 out_noput:
548 return err;
549 }
550
551 static 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
566 static 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
606 static 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
628 static 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
647 static 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
659 static 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
673 static 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
694 static 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;
698 struct km_event c;
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
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 */
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
721 c.event = nlh->nlmsg_type;
722 c.seq = nlh->nlmsg_seq;
723 c.pid = nlh->nlmsg_pid;
724 km_policy_notify(xp, p->dir, &c);
725
726 xfrm_pol_put(xp);
727
728 return 0;
729 }
730
731 static 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
760 rtattr_failure:
761 return -1;
762 }
763
764 static 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;
787 out:
788 sp->this_idx++;
789 return 0;
790
791 nlmsg_failure:
792 skb_trim(skb, b - skb->data);
793 return -1;
794 }
795
796 static 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
812 static 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
838 static 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;
843 struct km_event c;
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 }
871 } else {
872 c.data.byid = p->index;
873 c.event = nlh->nlmsg_type;
874 c.seq = nlh->nlmsg_seq;
875 c.pid = nlh->nlmsg_pid;
876 km_policy_notify(xp, p->dir, &c);
877 }
878
879 xfrm_pol_put(xp);
880
881 return err;
882 }
883
884 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
885 {
886 struct km_event c;
887 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
888
889 xfrm_state_flush(p->proto);
890 c.data.proto = p->proto;
891 c.event = nlh->nlmsg_type;
892 c.seq = nlh->nlmsg_seq;
893 c.pid = nlh->nlmsg_pid;
894 km_state_notify(NULL, &c);
895
896 return 0;
897 }
898
899 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
900 {
901 struct km_event c;
902
903 xfrm_policy_flush();
904 c.event = nlh->nlmsg_type;
905 c.seq = nlh->nlmsg_seq;
906 c.pid = nlh->nlmsg_pid;
907 km_policy_notify(NULL, 0, &c);
908 return 0;
909 }
910
911 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
912
913 static 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),
928 };
929
930 #undef XMSGSIZE
931
932 static struct xfrm_link {
933 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
934 int (*dump)(struct sk_buff *, struct netlink_callback *);
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 },
949 };
950
951 static int xfrm_done(struct netlink_callback *cb)
952 {
953 return 0;
954 }
955
956 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
957 {
958 struct rtattr *xfrma[XFRMA_MAX];
959 struct xfrm_link *link;
960 int type, min_len;
961
962 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
963 return 0;
964
965 type = nlh->nlmsg_type;
966
967 /* A control message: ignore them */
968 if (type < XFRM_MSG_BASE)
969 return 0;
970
971 /* Unknown message: reply with EINVAL */
972 if (type > XFRM_MSG_MAX)
973 goto err_einval;
974
975 type -= XFRM_MSG_BASE;
976 link = &xfrm_dispatch[type];
977
978 /* All operations require privileges, even GET */
979 if (security_netlink_recv(skb)) {
980 *errp = -EPERM;
981 return -1;
982 }
983
984 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
985 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
986 (nlh->nlmsg_flags & NLM_F_DUMP)) {
987 u32 rlen;
988
989 if (link->dump == NULL)
990 goto err_einval;
991
992 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
993 link->dump,
994 xfrm_done)) != 0) {
995 return -1;
996 }
997 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
998 if (rlen > skb->len)
999 rlen = skb->len;
1000 skb_pull(skb, rlen);
1001 return -1;
1002 }
1003
1004 memset(xfrma, 0, sizeof(xfrma));
1005
1006 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1007 goto err_einval;
1008
1009 if (nlh->nlmsg_len > min_len) {
1010 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1011 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1012
1013 while (RTA_OK(attr, attrlen)) {
1014 unsigned short flavor = attr->rta_type;
1015 if (flavor) {
1016 if (flavor > XFRMA_MAX)
1017 goto err_einval;
1018 xfrma[flavor - 1] = attr;
1019 }
1020 attr = RTA_NEXT(attr, attrlen);
1021 }
1022 }
1023
1024 if (link->doit == NULL)
1025 goto err_einval;
1026 *errp = link->doit(skb, nlh, (void **) &xfrma);
1027
1028 return *errp;
1029
1030 err_einval:
1031 *errp = -EINVAL;
1032 return -1;
1033 }
1034
1035 static int xfrm_user_rcv_skb(struct sk_buff *skb)
1036 {
1037 int err;
1038 struct nlmsghdr *nlh;
1039
1040 while (skb->len >= NLMSG_SPACE(0)) {
1041 u32 rlen;
1042
1043 nlh = (struct nlmsghdr *) skb->data;
1044 if (nlh->nlmsg_len < sizeof(*nlh) ||
1045 skb->len < nlh->nlmsg_len)
1046 return 0;
1047 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1048 if (rlen > skb->len)
1049 rlen = skb->len;
1050 if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
1051 if (err == 0)
1052 return -1;
1053 netlink_ack(skb, nlh, err);
1054 } else if (nlh->nlmsg_flags & NLM_F_ACK)
1055 netlink_ack(skb, nlh, 0);
1056 skb_pull(skb, rlen);
1057 }
1058
1059 return 0;
1060 }
1061
1062 static void xfrm_netlink_rcv(struct sock *sk, int len)
1063 {
1064 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
1065
1066 do {
1067 struct sk_buff *skb;
1068
1069 down(&xfrm_cfg_sem);
1070
1071 if (qlen > skb_queue_len(&sk->sk_receive_queue))
1072 qlen = skb_queue_len(&sk->sk_receive_queue);
1073
1074 for (; qlen; qlen--) {
1075 skb = skb_dequeue(&sk->sk_receive_queue);
1076 if (xfrm_user_rcv_skb(skb)) {
1077 if (skb->len)
1078 skb_queue_head(&sk->sk_receive_queue,
1079 skb);
1080 else {
1081 kfree_skb(skb);
1082 qlen--;
1083 }
1084 break;
1085 }
1086 kfree_skb(skb);
1087 }
1088
1089 up(&xfrm_cfg_sem);
1090
1091 } while (qlen);
1092 }
1093
1094 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
1095 {
1096 struct xfrm_user_expire *ue;
1097 struct nlmsghdr *nlh;
1098 unsigned char *b = skb->tail;
1099
1100 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
1101 sizeof(*ue));
1102 ue = NLMSG_DATA(nlh);
1103 nlh->nlmsg_flags = 0;
1104
1105 copy_to_user_state(x, &ue->state);
1106 ue->hard = (hard != 0) ? 1 : 0;
1107
1108 nlh->nlmsg_len = skb->tail - b;
1109 return skb->len;
1110
1111 nlmsg_failure:
1112 skb_trim(skb, b - skb->data);
1113 return -1;
1114 }
1115
1116 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1117 {
1118 struct sk_buff *skb;
1119 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1120
1121 skb = alloc_skb(len, GFP_ATOMIC);
1122 if (skb == NULL)
1123 return -ENOMEM;
1124
1125 if (build_expire(skb, x, c->data.hard) < 0)
1126 BUG();
1127
1128 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1129
1130 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1131 }
1132
1133 static int xfrm_notify_sa_flush(struct km_event *c)
1134 {
1135 struct xfrm_usersa_flush *p;
1136 struct nlmsghdr *nlh;
1137 struct sk_buff *skb;
1138 unsigned char *b;
1139 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1140
1141 skb = alloc_skb(len, GFP_ATOMIC);
1142 if (skb == NULL)
1143 return -ENOMEM;
1144 b = skb->tail;
1145
1146 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1147 XFRM_MSG_FLUSHSA, sizeof(*p));
1148 nlh->nlmsg_flags = 0;
1149
1150 p = NLMSG_DATA(nlh);
1151 p->proto = c->data.proto;
1152
1153 nlh->nlmsg_len = skb->tail - b;
1154
1155 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_SA, GFP_ATOMIC);
1156
1157 nlmsg_failure:
1158 kfree_skb(skb);
1159 return -1;
1160 }
1161
1162 static int inline xfrm_sa_len(struct xfrm_state *x)
1163 {
1164 int l = 0;
1165 if (x->aalg)
1166 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1167 if (x->ealg)
1168 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1169 if (x->calg)
1170 l += RTA_SPACE(sizeof(*x->calg));
1171 if (x->encap)
1172 l += RTA_SPACE(sizeof(*x->encap));
1173
1174 return l;
1175 }
1176
1177 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1178 {
1179 struct xfrm_usersa_info *p;
1180 struct xfrm_usersa_id *id;
1181 struct nlmsghdr *nlh;
1182 struct sk_buff *skb;
1183 unsigned char *b;
1184 int len = xfrm_sa_len(x);
1185 int headlen;
1186
1187 headlen = sizeof(*p);
1188 if (c->event == XFRM_MSG_DELSA) {
1189 len += RTA_SPACE(headlen);
1190 headlen = sizeof(*id);
1191 }
1192 len += NLMSG_SPACE(headlen);
1193
1194 skb = alloc_skb(len, GFP_ATOMIC);
1195 if (skb == NULL)
1196 return -ENOMEM;
1197 b = skb->tail;
1198
1199 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1200 nlh->nlmsg_flags = 0;
1201
1202 p = NLMSG_DATA(nlh);
1203 if (c->event == XFRM_MSG_DELSA) {
1204 id = NLMSG_DATA(nlh);
1205 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1206 id->spi = x->id.spi;
1207 id->family = x->props.family;
1208 id->proto = x->id.proto;
1209
1210 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1211 }
1212
1213 copy_to_user_state(x, p);
1214
1215 if (x->aalg)
1216 RTA_PUT(skb, XFRMA_ALG_AUTH,
1217 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1218 if (x->ealg)
1219 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1220 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1221 if (x->calg)
1222 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1223
1224 if (x->encap)
1225 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1226
1227 nlh->nlmsg_len = skb->tail - b;
1228
1229 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_SA, GFP_ATOMIC);
1230
1231 nlmsg_failure:
1232 rtattr_failure:
1233 kfree_skb(skb);
1234 return -1;
1235 }
1236
1237 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1238 {
1239
1240 switch (c->event) {
1241 case XFRM_MSG_EXPIRE:
1242 return xfrm_exp_state_notify(x, c);
1243 case XFRM_MSG_DELSA:
1244 case XFRM_MSG_UPDSA:
1245 case XFRM_MSG_NEWSA:
1246 return xfrm_notify_sa(x, c);
1247 case XFRM_MSG_FLUSHSA:
1248 return xfrm_notify_sa_flush(c);
1249 default:
1250 printk("xfrm_user: Unknown SA event %d\n", c->event);
1251 break;
1252 }
1253
1254 return 0;
1255
1256 }
1257
1258 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1259 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1260 int dir)
1261 {
1262 struct xfrm_user_acquire *ua;
1263 struct nlmsghdr *nlh;
1264 unsigned char *b = skb->tail;
1265 __u32 seq = xfrm_get_acqseq();
1266
1267 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1268 sizeof(*ua));
1269 ua = NLMSG_DATA(nlh);
1270 nlh->nlmsg_flags = 0;
1271
1272 memcpy(&ua->id, &x->id, sizeof(ua->id));
1273 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1274 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1275 copy_to_user_policy(xp, &ua->policy, dir);
1276 ua->aalgos = xt->aalgos;
1277 ua->ealgos = xt->ealgos;
1278 ua->calgos = xt->calgos;
1279 ua->seq = x->km.seq = seq;
1280
1281 if (copy_to_user_tmpl(xp, skb) < 0)
1282 goto nlmsg_failure;
1283
1284 nlh->nlmsg_len = skb->tail - b;
1285 return skb->len;
1286
1287 nlmsg_failure:
1288 skb_trim(skb, b - skb->data);
1289 return -1;
1290 }
1291
1292 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1293 struct xfrm_policy *xp, int dir)
1294 {
1295 struct sk_buff *skb;
1296 size_t len;
1297
1298 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1299 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1300 skb = alloc_skb(len, GFP_ATOMIC);
1301 if (skb == NULL)
1302 return -ENOMEM;
1303
1304 if (build_acquire(skb, x, xt, xp, dir) < 0)
1305 BUG();
1306
1307 NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE;
1308
1309 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC);
1310 }
1311
1312 /* User gives us xfrm_user_policy_info followed by an array of 0
1313 * or more templates.
1314 */
1315 static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1316 u8 *data, int len, int *dir)
1317 {
1318 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1319 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1320 struct xfrm_policy *xp;
1321 int nr;
1322
1323 switch (family) {
1324 case AF_INET:
1325 if (opt != IP_XFRM_POLICY) {
1326 *dir = -EOPNOTSUPP;
1327 return NULL;
1328 }
1329 break;
1330 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1331 case AF_INET6:
1332 if (opt != IPV6_XFRM_POLICY) {
1333 *dir = -EOPNOTSUPP;
1334 return NULL;
1335 }
1336 break;
1337 #endif
1338 default:
1339 *dir = -EINVAL;
1340 return NULL;
1341 }
1342
1343 *dir = -EINVAL;
1344
1345 if (len < sizeof(*p) ||
1346 verify_newpolicy_info(p))
1347 return NULL;
1348
1349 nr = ((len - sizeof(*p)) / sizeof(*ut));
1350 if (nr > XFRM_MAX_DEPTH)
1351 return NULL;
1352
1353 if (p->dir > XFRM_POLICY_OUT)
1354 return NULL;
1355
1356 xp = xfrm_policy_alloc(GFP_KERNEL);
1357 if (xp == NULL) {
1358 *dir = -ENOBUFS;
1359 return NULL;
1360 }
1361
1362 copy_from_user_policy(xp, p);
1363 copy_templates(xp, ut, nr);
1364
1365 *dir = p->dir;
1366
1367 return xp;
1368 }
1369
1370 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1371 int dir, int hard)
1372 {
1373 struct xfrm_user_polexpire *upe;
1374 struct nlmsghdr *nlh;
1375 unsigned char *b = skb->tail;
1376
1377 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1378 upe = NLMSG_DATA(nlh);
1379 nlh->nlmsg_flags = 0;
1380
1381 copy_to_user_policy(xp, &upe->pol, dir);
1382 if (copy_to_user_tmpl(xp, skb) < 0)
1383 goto nlmsg_failure;
1384 upe->hard = !!hard;
1385
1386 nlh->nlmsg_len = skb->tail - b;
1387 return skb->len;
1388
1389 nlmsg_failure:
1390 skb_trim(skb, b - skb->data);
1391 return -1;
1392 }
1393
1394 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1395 {
1396 struct sk_buff *skb;
1397 size_t len;
1398
1399 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1400 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1401 skb = alloc_skb(len, GFP_ATOMIC);
1402 if (skb == NULL)
1403 return -ENOMEM;
1404
1405 if (build_polexpire(skb, xp, dir, c->data.hard) < 0)
1406 BUG();
1407
1408 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1409
1410 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1411 }
1412
1413 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1414 {
1415 struct xfrm_userpolicy_info *p;
1416 struct xfrm_userpolicy_id *id;
1417 struct nlmsghdr *nlh;
1418 struct sk_buff *skb;
1419 unsigned char *b;
1420 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1421 int headlen;
1422
1423 headlen = sizeof(*p);
1424 if (c->event == XFRM_MSG_DELPOLICY) {
1425 len += RTA_SPACE(headlen);
1426 headlen = sizeof(*id);
1427 }
1428 len += NLMSG_SPACE(headlen);
1429
1430 skb = alloc_skb(len, GFP_ATOMIC);
1431 if (skb == NULL)
1432 return -ENOMEM;
1433 b = skb->tail;
1434
1435 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1436
1437 p = NLMSG_DATA(nlh);
1438 if (c->event == XFRM_MSG_DELPOLICY) {
1439 id = NLMSG_DATA(nlh);
1440 memset(id, 0, sizeof(*id));
1441 id->dir = dir;
1442 if (c->data.byid)
1443 id->index = xp->index;
1444 else
1445 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
1446
1447 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
1448 }
1449
1450 nlh->nlmsg_flags = 0;
1451
1452 copy_to_user_policy(xp, p, dir);
1453 if (copy_to_user_tmpl(xp, skb) < 0)
1454 goto nlmsg_failure;
1455
1456 nlh->nlmsg_len = skb->tail - b;
1457
1458 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC);
1459
1460 nlmsg_failure:
1461 rtattr_failure:
1462 kfree_skb(skb);
1463 return -1;
1464 }
1465
1466 static int xfrm_notify_policy_flush(struct km_event *c)
1467 {
1468 struct nlmsghdr *nlh;
1469 struct sk_buff *skb;
1470 unsigned char *b;
1471 int len = NLMSG_LENGTH(0);
1472
1473 skb = alloc_skb(len, GFP_ATOMIC);
1474 if (skb == NULL)
1475 return -ENOMEM;
1476 b = skb->tail;
1477
1478
1479 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
1480
1481 nlh->nlmsg_len = skb->tail - b;
1482
1483 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC);
1484
1485 nlmsg_failure:
1486 kfree_skb(skb);
1487 return -1;
1488 }
1489
1490 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1491 {
1492
1493 switch (c->event) {
1494 case XFRM_MSG_NEWPOLICY:
1495 case XFRM_MSG_UPDPOLICY:
1496 case XFRM_MSG_DELPOLICY:
1497 return xfrm_notify_policy(xp, dir, c);
1498 case XFRM_MSG_FLUSHPOLICY:
1499 return xfrm_notify_policy_flush(c);
1500 case XFRM_MSG_POLEXPIRE:
1501 return xfrm_exp_policy_notify(xp, dir, c);
1502 default:
1503 printk("xfrm_user: Unknown Policy event %d\n", c->event);
1504 }
1505
1506 return 0;
1507
1508 }
1509
1510 static struct xfrm_mgr netlink_mgr = {
1511 .id = "netlink",
1512 .notify = xfrm_send_state_notify,
1513 .acquire = xfrm_send_acquire,
1514 .compile_policy = xfrm_compile_policy,
1515 .notify_policy = xfrm_send_policy_notify,
1516 };
1517
1518 static int __init xfrm_user_init(void)
1519 {
1520 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1521
1522 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv,
1523 THIS_MODULE);
1524 if (xfrm_nl == NULL)
1525 return -ENOMEM;
1526
1527 xfrm_register_km(&netlink_mgr);
1528
1529 return 0;
1530 }
1531
1532 static void __exit xfrm_user_exit(void)
1533 {
1534 xfrm_unregister_km(&netlink_mgr);
1535 sock_release(xfrm_nl->sk_socket);
1536 }
1537
1538 module_init(xfrm_user_init);
1539 module_exit(xfrm_user_exit);
1540 MODULE_LICENSE("GPL");
1541 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
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