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[IPSEC] Use XFRM_MSG_* instead of XFRM_SAP_*
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / xfrm / xfrm_user.c
blobbc4fd74568738041b5501d6f0de847f36b23f36d
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/socket.h>
18 #include <linux/string.h>
19 #include <linux/net.h>
20 #include <linux/skbuff.h>
21 #include <linux/netlink.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/pfkeyv2.h>
24 #include <linux/ipsec.h>
25 #include <linux/init.h>
26 #include <linux/security.h>
27 #include <net/sock.h>
28 #include <net/xfrm.h>
29 #include <asm/uaccess.h>
30
31 static struct sock *xfrm_nl;
32
33 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
34 {
35 struct rtattr *rt = xfrma[type - 1];
36 struct xfrm_algo *algp;
37 int len;
38
39 if (!rt)
40 return 0;
41
42 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
43 if (len < 0)
44 return -EINVAL;
45
46 algp = RTA_DATA(rt);
47
48 len -= (algp->alg_key_len + 7U) / 8;
49 if (len < 0)
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 if (!algp->alg_key_len &&
55 strcmp(algp->alg_name, "digest_null") != 0)
56 return -EINVAL;
57 break;
58
59 case XFRMA_ALG_CRYPT:
60 if (!algp->alg_key_len &&
61 strcmp(algp->alg_name, "cipher_null") != 0)
62 return -EINVAL;
63 break;
64
65 case XFRMA_ALG_COMP:
66 /* Zero length keys are legal. */
67 break;
68
69 default:
70 return -EINVAL;
71 };
72
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 return 0;
75 }
76
77 static int verify_encap_tmpl(struct rtattr **xfrma)
78 {
79 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
80 struct xfrm_encap_tmpl *encap;
81
82 if (!rt)
83 return 0;
84
85 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
86 return -EINVAL;
87
88 return 0;
89 }
90
91 static int verify_newsa_info(struct xfrm_usersa_info *p,
92 struct rtattr **xfrma)
93 {
94 int err;
95
96 err = -EINVAL;
97 switch (p->family) {
98 case AF_INET:
99 break;
100
101 case AF_INET6:
102 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
103 break;
104 #else
105 err = -EAFNOSUPPORT;
106 goto out;
107 #endif
108
109 default:
110 goto out;
111 };
112
113 err = -EINVAL;
114 switch (p->id.proto) {
115 case IPPROTO_AH:
116 if (!xfrma[XFRMA_ALG_AUTH-1] ||
117 xfrma[XFRMA_ALG_CRYPT-1] ||
118 xfrma[XFRMA_ALG_COMP-1])
119 goto out;
120 break;
121
122 case IPPROTO_ESP:
123 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
124 !xfrma[XFRMA_ALG_CRYPT-1]) ||
125 xfrma[XFRMA_ALG_COMP-1])
126 goto out;
127 break;
128
129 case IPPROTO_COMP:
130 if (!xfrma[XFRMA_ALG_COMP-1] ||
131 xfrma[XFRMA_ALG_AUTH-1] ||
132 xfrma[XFRMA_ALG_CRYPT-1])
133 goto out;
134 break;
135
136 default:
137 goto out;
138 };
139
140 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
141 goto out;
142 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
143 goto out;
144 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
145 goto out;
146 if ((err = verify_encap_tmpl(xfrma)))
147 goto out;
148
149 err = -EINVAL;
150 switch (p->mode) {
151 case 0:
152 case 1:
153 break;
154
155 default:
156 goto out;
157 };
158
159 err = 0;
160
161 out:
162 return err;
163 }
164
165 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
166 struct xfrm_algo_desc *(*get_byname)(char *, int),
167 struct rtattr *u_arg)
168 {
169 struct rtattr *rta = u_arg;
170 struct xfrm_algo *p, *ualg;
171 struct xfrm_algo_desc *algo;
172 int len;
173
174 if (!rta)
175 return 0;
176
177 ualg = RTA_DATA(rta);
178
179 algo = get_byname(ualg->alg_name, 1);
180 if (!algo)
181 return -ENOSYS;
182 *props = algo->desc.sadb_alg_id;
183
184 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
185 p = kmalloc(len, GFP_KERNEL);
186 if (!p)
187 return -ENOMEM;
188
189 memcpy(p, ualg, len);
190 *algpp = p;
191 return 0;
192 }
193
194 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
195 {
196 struct rtattr *rta = u_arg;
197 struct xfrm_encap_tmpl *p, *uencap;
198
199 if (!rta)
200 return 0;
201
202 uencap = RTA_DATA(rta);
203 p = kmalloc(sizeof(*p), GFP_KERNEL);
204 if (!p)
205 return -ENOMEM;
206
207 memcpy(p, uencap, sizeof(*p));
208 *encapp = p;
209 return 0;
210 }
211
212 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
213 {
214 memcpy(&x->id, &p->id, sizeof(x->id));
215 memcpy(&x->sel, &p->sel, sizeof(x->sel));
216 memcpy(&x->lft, &p->lft, sizeof(x->lft));
217 x->props.mode = p->mode;
218 x->props.replay_window = p->replay_window;
219 x->props.reqid = p->reqid;
220 x->props.family = p->family;
221 x->props.saddr = p->saddr;
222 x->props.flags = p->flags;
223 }
224
225 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
226 struct rtattr **xfrma,
227 int *errp)
228 {
229 struct xfrm_state *x = xfrm_state_alloc();
230 int err = -ENOMEM;
231
232 if (!x)
233 goto error_no_put;
234
235 copy_from_user_state(x, p);
236
237 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
238 xfrm_aalg_get_byname,
239 xfrma[XFRMA_ALG_AUTH-1])))
240 goto error;
241 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
242 xfrm_ealg_get_byname,
243 xfrma[XFRMA_ALG_CRYPT-1])))
244 goto error;
245 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
246 xfrm_calg_get_byname,
247 xfrma[XFRMA_ALG_COMP-1])))
248 goto error;
249 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
250 goto error;
251
252 err = -ENOENT;
253 x->type = xfrm_get_type(x->id.proto, x->props.family);
254 if (x->type == NULL)
255 goto error;
256
257 err = x->type->init_state(x, NULL);
258 if (err)
259 goto error;
260
261 x->curlft.add_time = (unsigned long) xtime.tv_sec;
262 x->km.state = XFRM_STATE_VALID;
263 x->km.seq = p->seq;
264
265 return x;
266
267 error:
268 x->km.state = XFRM_STATE_DEAD;
269 xfrm_state_put(x);
270 error_no_put:
271 *errp = err;
272 return NULL;
273 }
274
275 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
276 {
277 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
278 struct xfrm_state *x;
279 int err;
280 struct km_event c;
281
282 err = verify_newsa_info(p, (struct rtattr **) xfrma);
283 if (err)
284 return err;
285
286 x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
287 if (!x)
288 return err;
289
290 xfrm_state_hold(x);
291 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
292 err = xfrm_state_add(x);
293 else
294 err = xfrm_state_update(x);
295
296 if (err < 0) {
297 x->km.state = XFRM_STATE_DEAD;
298 xfrm_state_put(x);
299 return err;
300 }
301
302 c.seq = nlh->nlmsg_seq;
303 c.pid = nlh->nlmsg_pid;
304 c.event = nlh->nlmsg_type;
305
306 km_state_notify(x, &c);
307 xfrm_state_put(x);
308
309 return err;
310 }
311
312 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
313 {
314 struct xfrm_state *x;
315 int err;
316 struct km_event c;
317 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
318
319 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
320 if (x == NULL)
321 return -ESRCH;
322
323 if (xfrm_state_kern(x)) {
324 xfrm_state_put(x);
325 return -EPERM;
326 }
327
328 err = xfrm_state_delete(x);
329 if (err < 0) {
330 xfrm_state_put(x);
331 return err;
332 }
333
334 c.seq = nlh->nlmsg_seq;
335 c.pid = nlh->nlmsg_pid;
336 c.event = nlh->nlmsg_type;
337 km_state_notify(x, &c);
338 xfrm_state_put(x);
339
340 return err;
341 }
342
343 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
344 {
345 memcpy(&p->id, &x->id, sizeof(p->id));
346 memcpy(&p->sel, &x->sel, sizeof(p->sel));
347 memcpy(&p->lft, &x->lft, sizeof(p->lft));
348 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
349 memcpy(&p->stats, &x->stats, sizeof(p->stats));
350 p->saddr = x->props.saddr;
351 p->mode = x->props.mode;
352 p->replay_window = x->props.replay_window;
353 p->reqid = x->props.reqid;
354 p->family = x->props.family;
355 p->flags = x->props.flags;
356 p->seq = x->km.seq;
357 }
358
359 struct xfrm_dump_info {
360 struct sk_buff *in_skb;
361 struct sk_buff *out_skb;
362 u32 nlmsg_seq;
363 u16 nlmsg_flags;
364 int start_idx;
365 int this_idx;
366 };
367
368 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
369 {
370 struct xfrm_dump_info *sp = ptr;
371 struct sk_buff *in_skb = sp->in_skb;
372 struct sk_buff *skb = sp->out_skb;
373 struct xfrm_usersa_info *p;
374 struct nlmsghdr *nlh;
375 unsigned char *b = skb->tail;
376
377 if (sp->this_idx < sp->start_idx)
378 goto out;
379
380 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
381 sp->nlmsg_seq,
382 XFRM_MSG_NEWSA, sizeof(*p));
383 nlh->nlmsg_flags = sp->nlmsg_flags;
384
385 p = NLMSG_DATA(nlh);
386 copy_to_user_state(x, p);
387
388 if (x->aalg)
389 RTA_PUT(skb, XFRMA_ALG_AUTH,
390 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
391 if (x->ealg)
392 RTA_PUT(skb, XFRMA_ALG_CRYPT,
393 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
394 if (x->calg)
395 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
396
397 if (x->encap)
398 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
399
400 nlh->nlmsg_len = skb->tail - b;
401 out:
402 sp->this_idx++;
403 return 0;
404
405 nlmsg_failure:
406 rtattr_failure:
407 skb_trim(skb, b - skb->data);
408 return -1;
409 }
410
411 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
412 {
413 struct xfrm_dump_info info;
414
415 info.in_skb = cb->skb;
416 info.out_skb = skb;
417 info.nlmsg_seq = cb->nlh->nlmsg_seq;
418 info.nlmsg_flags = NLM_F_MULTI;
419 info.this_idx = 0;
420 info.start_idx = cb->args[0];
421 (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
422 cb->args[0] = info.this_idx;
423
424 return skb->len;
425 }
426
427 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
428 struct xfrm_state *x, u32 seq)
429 {
430 struct xfrm_dump_info info;
431 struct sk_buff *skb;
432
433 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
434 if (!skb)
435 return ERR_PTR(-ENOMEM);
436
437 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
438 info.in_skb = in_skb;
439 info.out_skb = skb;
440 info.nlmsg_seq = seq;
441 info.nlmsg_flags = 0;
442 info.this_idx = info.start_idx = 0;
443
444 if (dump_one_state(x, 0, &info)) {
445 kfree_skb(skb);
446 return NULL;
447 }
448
449 return skb;
450 }
451
452 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
453 {
454 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
455 struct xfrm_state *x;
456 struct sk_buff *resp_skb;
457 int err;
458
459 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
460 err = -ESRCH;
461 if (x == NULL)
462 goto out_noput;
463
464 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
465 if (IS_ERR(resp_skb)) {
466 err = PTR_ERR(resp_skb);
467 } else {
468 err = netlink_unicast(xfrm_nl, resp_skb,
469 NETLINK_CB(skb).pid, MSG_DONTWAIT);
470 }
471 xfrm_state_put(x);
472 out_noput:
473 return err;
474 }
475
476 static int verify_userspi_info(struct xfrm_userspi_info *p)
477 {
478 switch (p->info.id.proto) {
479 case IPPROTO_AH:
480 case IPPROTO_ESP:
481 break;
482
483 case IPPROTO_COMP:
484 /* IPCOMP spi is 16-bits. */
485 if (p->max >= 0x10000)
486 return -EINVAL;
487 break;
488
489 default:
490 return -EINVAL;
491 };
492
493 if (p->min > p->max)
494 return -EINVAL;
495
496 return 0;
497 }
498
499 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
500 {
501 struct xfrm_state *x;
502 struct xfrm_userspi_info *p;
503 struct sk_buff *resp_skb;
504 xfrm_address_t *daddr;
505 int family;
506 int err;
507
508 p = NLMSG_DATA(nlh);
509 err = verify_userspi_info(p);
510 if (err)
511 goto out_noput;
512
513 family = p->info.family;
514 daddr = &p->info.id.daddr;
515
516 x = NULL;
517 if (p->info.seq) {
518 x = xfrm_find_acq_byseq(p->info.seq);
519 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
520 xfrm_state_put(x);
521 x = NULL;
522 }
523 }
524
525 if (!x)
526 x = xfrm_find_acq(p->info.mode, p->info.reqid,
527 p->info.id.proto, daddr,
528 &p->info.saddr, 1,
529 family);
530 err = -ENOENT;
531 if (x == NULL)
532 goto out_noput;
533
534 resp_skb = ERR_PTR(-ENOENT);
535
536 spin_lock_bh(&x->lock);
537 if (x->km.state != XFRM_STATE_DEAD) {
538 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
539 if (x->id.spi)
540 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
541 }
542 spin_unlock_bh(&x->lock);
543
544 if (IS_ERR(resp_skb)) {
545 err = PTR_ERR(resp_skb);
546 goto out;
547 }
548
549 err = netlink_unicast(xfrm_nl, resp_skb,
550 NETLINK_CB(skb).pid, MSG_DONTWAIT);
551
552 out:
553 xfrm_state_put(x);
554 out_noput:
555 return err;
556 }
557
558 static int verify_policy_dir(__u8 dir)
559 {
560 switch (dir) {
561 case XFRM_POLICY_IN:
562 case XFRM_POLICY_OUT:
563 case XFRM_POLICY_FWD:
564 break;
565
566 default:
567 return -EINVAL;
568 };
569
570 return 0;
571 }
572
573 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
574 {
575 switch (p->share) {
576 case XFRM_SHARE_ANY:
577 case XFRM_SHARE_SESSION:
578 case XFRM_SHARE_USER:
579 case XFRM_SHARE_UNIQUE:
580 break;
581
582 default:
583 return -EINVAL;
584 };
585
586 switch (p->action) {
587 case XFRM_POLICY_ALLOW:
588 case XFRM_POLICY_BLOCK:
589 break;
590
591 default:
592 return -EINVAL;
593 };
594
595 switch (p->sel.family) {
596 case AF_INET:
597 break;
598
599 case AF_INET6:
600 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
601 break;
602 #else
603 return -EAFNOSUPPORT;
604 #endif
605
606 default:
607 return -EINVAL;
608 };
609
610 return verify_policy_dir(p->dir);
611 }
612
613 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
614 int nr)
615 {
616 int i;
617
618 xp->xfrm_nr = nr;
619 for (i = 0; i < nr; i++, ut++) {
620 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
621
622 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
623 memcpy(&t->saddr, &ut->saddr,
624 sizeof(xfrm_address_t));
625 t->reqid = ut->reqid;
626 t->mode = ut->mode;
627 t->share = ut->share;
628 t->optional = ut->optional;
629 t->aalgos = ut->aalgos;
630 t->ealgos = ut->ealgos;
631 t->calgos = ut->calgos;
632 }
633 }
634
635 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
636 {
637 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
638 struct xfrm_user_tmpl *utmpl;
639 int nr;
640
641 if (!rt) {
642 pol->xfrm_nr = 0;
643 } else {
644 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
645
646 if (nr > XFRM_MAX_DEPTH)
647 return -EINVAL;
648
649 copy_templates(pol, RTA_DATA(rt), nr);
650 }
651 return 0;
652 }
653
654 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
655 {
656 xp->priority = p->priority;
657 xp->index = p->index;
658 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
659 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
660 xp->action = p->action;
661 xp->flags = p->flags;
662 xp->family = p->sel.family;
663 /* XXX xp->share = p->share; */
664 }
665
666 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
667 {
668 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
669 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
670 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
671 p->priority = xp->priority;
672 p->index = xp->index;
673 p->sel.family = xp->family;
674 p->dir = dir;
675 p->action = xp->action;
676 p->flags = xp->flags;
677 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
678 }
679
680 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
681 {
682 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
683 int err;
684
685 if (!xp) {
686 *errp = -ENOMEM;
687 return NULL;
688 }
689
690 copy_from_user_policy(xp, p);
691 err = copy_from_user_tmpl(xp, xfrma);
692 if (err) {
693 *errp = err;
694 kfree(xp);
695 xp = NULL;
696 }
697
698 return xp;
699 }
700
701 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
702 {
703 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
704 struct xfrm_policy *xp;
705 struct km_event c;
706 int err;
707 int excl;
708
709 err = verify_newpolicy_info(p);
710 if (err)
711 return err;
712
713 xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
714 if (!xp)
715 return err;
716
717 /* shouldnt excl be based on nlh flags??
718 * Aha! this is anti-netlink really i.e more pfkey derived
719 * in netlink excl is a flag and you wouldnt need
720 * a type XFRM_MSG_UPDPOLICY - JHS */
721 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
722 err = xfrm_policy_insert(p->dir, xp, excl);
723 if (err) {
724 kfree(xp);
725 return err;
726 }
727
728 c.event = nlh->nlmsg_type;
729 c.seq = nlh->nlmsg_seq;
730 c.pid = nlh->nlmsg_pid;
731 km_policy_notify(xp, p->dir, &c);
732
733 xfrm_pol_put(xp);
734
735 return 0;
736 }
737
738 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
739 {
740 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
741 int i;
742
743 if (xp->xfrm_nr == 0)
744 return 0;
745
746 for (i = 0; i < xp->xfrm_nr; i++) {
747 struct xfrm_user_tmpl *up = &vec[i];
748 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
749
750 memcpy(&up->id, &kp->id, sizeof(up->id));
751 up->family = xp->family;
752 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
753 up->reqid = kp->reqid;
754 up->mode = kp->mode;
755 up->share = kp->share;
756 up->optional = kp->optional;
757 up->aalgos = kp->aalgos;
758 up->ealgos = kp->ealgos;
759 up->calgos = kp->calgos;
760 }
761 RTA_PUT(skb, XFRMA_TMPL,
762 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
763 vec);
764
765 return 0;
766
767 rtattr_failure:
768 return -1;
769 }
770
771 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
772 {
773 struct xfrm_dump_info *sp = ptr;
774 struct xfrm_userpolicy_info *p;
775 struct sk_buff *in_skb = sp->in_skb;
776 struct sk_buff *skb = sp->out_skb;
777 struct nlmsghdr *nlh;
778 unsigned char *b = skb->tail;
779
780 if (sp->this_idx < sp->start_idx)
781 goto out;
782
783 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
784 sp->nlmsg_seq,
785 XFRM_MSG_NEWPOLICY, sizeof(*p));
786 p = NLMSG_DATA(nlh);
787 nlh->nlmsg_flags = sp->nlmsg_flags;
788
789 copy_to_user_policy(xp, p, dir);
790 if (copy_to_user_tmpl(xp, skb) < 0)
791 goto nlmsg_failure;
792
793 nlh->nlmsg_len = skb->tail - b;
794 out:
795 sp->this_idx++;
796 return 0;
797
798 nlmsg_failure:
799 skb_trim(skb, b - skb->data);
800 return -1;
801 }
802
803 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
804 {
805 struct xfrm_dump_info info;
806
807 info.in_skb = cb->skb;
808 info.out_skb = skb;
809 info.nlmsg_seq = cb->nlh->nlmsg_seq;
810 info.nlmsg_flags = NLM_F_MULTI;
811 info.this_idx = 0;
812 info.start_idx = cb->args[0];
813 (void) xfrm_policy_walk(dump_one_policy, &info);
814 cb->args[0] = info.this_idx;
815
816 return skb->len;
817 }
818
819 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
820 struct xfrm_policy *xp,
821 int dir, u32 seq)
822 {
823 struct xfrm_dump_info info;
824 struct sk_buff *skb;
825
826 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
827 if (!skb)
828 return ERR_PTR(-ENOMEM);
829
830 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
831 info.in_skb = in_skb;
832 info.out_skb = skb;
833 info.nlmsg_seq = seq;
834 info.nlmsg_flags = 0;
835 info.this_idx = info.start_idx = 0;
836
837 if (dump_one_policy(xp, dir, 0, &info) < 0) {
838 kfree_skb(skb);
839 return NULL;
840 }
841
842 return skb;
843 }
844
845 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
846 {
847 struct xfrm_policy *xp;
848 struct xfrm_userpolicy_id *p;
849 int err;
850 struct km_event c;
851 int delete;
852
853 p = NLMSG_DATA(nlh);
854 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
855
856 err = verify_policy_dir(p->dir);
857 if (err)
858 return err;
859
860 if (p->index)
861 xp = xfrm_policy_byid(p->dir, p->index, delete);
862 else
863 xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
864 if (xp == NULL)
865 return -ENOENT;
866
867 if (!delete) {
868 struct sk_buff *resp_skb;
869
870 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
871 if (IS_ERR(resp_skb)) {
872 err = PTR_ERR(resp_skb);
873 } else {
874 err = netlink_unicast(xfrm_nl, resp_skb,
875 NETLINK_CB(skb).pid,
876 MSG_DONTWAIT);
877 }
878 } else {
879 c.data.byid = p->index;
880 c.event = nlh->nlmsg_type;
881 c.seq = nlh->nlmsg_seq;
882 c.pid = nlh->nlmsg_pid;
883 km_policy_notify(xp, p->dir, &c);
884 }
885
886 xfrm_pol_put(xp);
887
888 return err;
889 }
890
891 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
892 {
893 struct km_event c;
894 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
895
896 xfrm_state_flush(p->proto);
897 c.data.proto = p->proto;
898 c.event = nlh->nlmsg_type;
899 c.seq = nlh->nlmsg_seq;
900 c.pid = nlh->nlmsg_pid;
901 km_state_notify(NULL, &c);
902
903 return 0;
904 }
905
906 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
907 {
908 struct km_event c;
909
910 xfrm_policy_flush();
911 c.event = nlh->nlmsg_type;
912 c.seq = nlh->nlmsg_seq;
913 c.pid = nlh->nlmsg_pid;
914 km_policy_notify(NULL, 0, &c);
915 return 0;
916 }
917
918 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
919
920 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
921 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
922 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
923 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
924 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
925 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
926 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
927 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
928 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
929 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
930 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
931 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
932 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
933 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
934 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
935 };
936
937 #undef XMSGSIZE
938
939 static struct xfrm_link {
940 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
941 int (*dump)(struct sk_buff *, struct netlink_callback *);
942 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
943 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
944 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
945 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
946 .dump = xfrm_dump_sa },
947 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
948 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
949 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
950 .dump = xfrm_dump_policy },
951 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
952 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
953 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
954 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
955 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
956 };
957
958 static int xfrm_done(struct netlink_callback *cb)
959 {
960 return 0;
961 }
962
963 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
964 {
965 struct rtattr *xfrma[XFRMA_MAX];
966 struct xfrm_link *link;
967 int type, min_len;
968
969 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
970 return 0;
971
972 type = nlh->nlmsg_type;
973
974 /* A control message: ignore them */
975 if (type < XFRM_MSG_BASE)
976 return 0;
977
978 /* Unknown message: reply with EINVAL */
979 if (type > XFRM_MSG_MAX)
980 goto err_einval;
981
982 type -= XFRM_MSG_BASE;
983 link = &xfrm_dispatch[type];
984
985 /* All operations require privileges, even GET */
986 if (security_netlink_recv(skb)) {
987 *errp = -EPERM;
988 return -1;
989 }
990
991 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
992 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
993 (nlh->nlmsg_flags & NLM_F_DUMP)) {
994 u32 rlen;
995
996 if (link->dump == NULL)
997 goto err_einval;
998
999 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
1000 link->dump,
1001 xfrm_done)) != 0) {
1002 return -1;
1003 }
1004 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1005 if (rlen > skb->len)
1006 rlen = skb->len;
1007 skb_pull(skb, rlen);
1008 return -1;
1009 }
1010
1011 memset(xfrma, 0, sizeof(xfrma));
1012
1013 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1014 goto err_einval;
1015
1016 if (nlh->nlmsg_len > min_len) {
1017 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1018 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1019
1020 while (RTA_OK(attr, attrlen)) {
1021 unsigned short flavor = attr->rta_type;
1022 if (flavor) {
1023 if (flavor > XFRMA_MAX)
1024 goto err_einval;
1025 xfrma[flavor - 1] = attr;
1026 }
1027 attr = RTA_NEXT(attr, attrlen);
1028 }
1029 }
1030
1031 if (link->doit == NULL)
1032 goto err_einval;
1033 *errp = link->doit(skb, nlh, (void **) &xfrma);
1034
1035 return *errp;
1036
1037 err_einval:
1038 *errp = -EINVAL;
1039 return -1;
1040 }
1041
1042 static int xfrm_user_rcv_skb(struct sk_buff *skb)
1043 {
1044 int err;
1045 struct nlmsghdr *nlh;
1046
1047 while (skb->len >= NLMSG_SPACE(0)) {
1048 u32 rlen;
1049
1050 nlh = (struct nlmsghdr *) skb->data;
1051 if (nlh->nlmsg_len < sizeof(*nlh) ||
1052 skb->len < nlh->nlmsg_len)
1053 return 0;
1054 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1055 if (rlen > skb->len)
1056 rlen = skb->len;
1057 if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
1058 if (err == 0)
1059 return -1;
1060 netlink_ack(skb, nlh, err);
1061 } else if (nlh->nlmsg_flags & NLM_F_ACK)
1062 netlink_ack(skb, nlh, 0);
1063 skb_pull(skb, rlen);
1064 }
1065
1066 return 0;
1067 }
1068
1069 static void xfrm_netlink_rcv(struct sock *sk, int len)
1070 {
1071 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
1072
1073 do {
1074 struct sk_buff *skb;
1075
1076 down(&xfrm_cfg_sem);
1077
1078 if (qlen > skb_queue_len(&sk->sk_receive_queue))
1079 qlen = skb_queue_len(&sk->sk_receive_queue);
1080
1081 for (; qlen; qlen--) {
1082 skb = skb_dequeue(&sk->sk_receive_queue);
1083 if (xfrm_user_rcv_skb(skb)) {
1084 if (skb->len)
1085 skb_queue_head(&sk->sk_receive_queue,
1086 skb);
1087 else {
1088 kfree_skb(skb);
1089 qlen--;
1090 }
1091 break;
1092 }
1093 kfree_skb(skb);
1094 }
1095
1096 up(&xfrm_cfg_sem);
1097
1098 } while (qlen);
1099 }
1100
1101 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
1102 {
1103 struct xfrm_user_expire *ue;
1104 struct nlmsghdr *nlh;
1105 unsigned char *b = skb->tail;
1106
1107 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
1108 sizeof(*ue));
1109 ue = NLMSG_DATA(nlh);
1110 nlh->nlmsg_flags = 0;
1111
1112 copy_to_user_state(x, &ue->state);
1113 ue->hard = (hard != 0) ? 1 : 0;
1114
1115 nlh->nlmsg_len = skb->tail - b;
1116 return skb->len;
1117
1118 nlmsg_failure:
1119 skb_trim(skb, b - skb->data);
1120 return -1;
1121 }
1122
1123 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1124 {
1125 struct sk_buff *skb;
1126
1127 /* fix to do alloc using NLM macros */
1128 skb = alloc_skb(sizeof(struct xfrm_user_expire) + 16, GFP_ATOMIC);
1129 if (skb == NULL)
1130 return -ENOMEM;
1131
1132 if (build_expire(skb, x, c->data.hard) < 0)
1133 BUG();
1134
1135 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1136
1137 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1138 }
1139
1140 static int xfrm_notify_sa_flush(struct km_event *c)
1141 {
1142 struct xfrm_usersa_flush *p;
1143 struct nlmsghdr *nlh;
1144 struct sk_buff *skb;
1145 unsigned char *b;
1146 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1147
1148 skb = alloc_skb(len, GFP_ATOMIC);
1149 if (skb == NULL)
1150 return -ENOMEM;
1151 b = skb->tail;
1152
1153 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1154 XFRM_MSG_FLUSHSA, sizeof(*p));
1155 nlh->nlmsg_flags = 0;
1156
1157 p = NLMSG_DATA(nlh);
1158 p->proto = c->data.proto;
1159
1160 nlh->nlmsg_len = skb->tail - b;
1161
1162 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_SA, GFP_ATOMIC);
1163
1164 nlmsg_failure:
1165 kfree_skb(skb);
1166 return -1;
1167 }
1168
1169 static int inline xfrm_sa_len(struct xfrm_state *x)
1170 {
1171 int l = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
1172 if (x->aalg)
1173 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1174 if (x->ealg)
1175 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1176 if (x->calg)
1177 l += RTA_SPACE(sizeof(*x->calg));
1178 if (x->encap)
1179 l += RTA_SPACE(sizeof(*x->encap));
1180
1181 return l;
1182 }
1183
1184 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1185 {
1186 struct xfrm_usersa_info *p;
1187 struct nlmsghdr *nlh;
1188 struct sk_buff *skb;
1189 unsigned char *b;
1190 int len = xfrm_sa_len(x);
1191
1192 skb = alloc_skb(len, GFP_ATOMIC);
1193 if (skb == NULL)
1194 return -ENOMEM;
1195 b = skb->tail;
1196
1197 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, sizeof(*p));
1198 nlh->nlmsg_flags = 0;
1199
1200 p = NLMSG_DATA(nlh);
1201 copy_to_user_state(x, p);
1202
1203 if (x->aalg)
1204 RTA_PUT(skb, XFRMA_ALG_AUTH,
1205 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1206 if (x->ealg)
1207 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1208 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1209 if (x->calg)
1210 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1211
1212 if (x->encap)
1213 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1214
1215 nlh->nlmsg_len = skb->tail - b;
1216
1217 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_SA, GFP_ATOMIC);
1218
1219 nlmsg_failure:
1220 rtattr_failure:
1221 kfree_skb(skb);
1222 return -1;
1223 }
1224
1225 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1226 {
1227
1228 switch (c->event) {
1229 case XFRM_MSG_EXPIRE:
1230 return xfrm_exp_state_notify(x, c);
1231 case XFRM_MSG_DELSA:
1232 case XFRM_MSG_UPDSA:
1233 case XFRM_MSG_NEWSA:
1234 return xfrm_notify_sa(x, c);
1235 case XFRM_MSG_FLUSHSA:
1236 return xfrm_notify_sa_flush(c);
1237 default:
1238 printk("xfrm_user: Unknown SA event %d\n", c->event);
1239 break;
1240 }
1241
1242 return 0;
1243
1244 }
1245
1246 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1247 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1248 int dir)
1249 {
1250 struct xfrm_user_acquire *ua;
1251 struct nlmsghdr *nlh;
1252 unsigned char *b = skb->tail;
1253 __u32 seq = xfrm_get_acqseq();
1254
1255 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1256 sizeof(*ua));
1257 ua = NLMSG_DATA(nlh);
1258 nlh->nlmsg_flags = 0;
1259
1260 memcpy(&ua->id, &x->id, sizeof(ua->id));
1261 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1262 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1263 copy_to_user_policy(xp, &ua->policy, dir);
1264 ua->aalgos = xt->aalgos;
1265 ua->ealgos = xt->ealgos;
1266 ua->calgos = xt->calgos;
1267 ua->seq = x->km.seq = seq;
1268
1269 if (copy_to_user_tmpl(xp, skb) < 0)
1270 goto nlmsg_failure;
1271
1272 nlh->nlmsg_len = skb->tail - b;
1273 return skb->len;
1274
1275 nlmsg_failure:
1276 skb_trim(skb, b - skb->data);
1277 return -1;
1278 }
1279
1280 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1281 struct xfrm_policy *xp, int dir)
1282 {
1283 struct sk_buff *skb;
1284 size_t len;
1285
1286 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1287 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1288 skb = alloc_skb(len, GFP_ATOMIC);
1289 if (skb == NULL)
1290 return -ENOMEM;
1291
1292 if (build_acquire(skb, x, xt, xp, dir) < 0)
1293 BUG();
1294
1295 NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE;
1296
1297 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC);
1298 }
1299
1300 /* User gives us xfrm_user_policy_info followed by an array of 0
1301 * or more templates.
1302 */
1303 static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1304 u8 *data, int len, int *dir)
1305 {
1306 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1307 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1308 struct xfrm_policy *xp;
1309 int nr;
1310
1311 switch (family) {
1312 case AF_INET:
1313 if (opt != IP_XFRM_POLICY) {
1314 *dir = -EOPNOTSUPP;
1315 return NULL;
1316 }
1317 break;
1318 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1319 case AF_INET6:
1320 if (opt != IPV6_XFRM_POLICY) {
1321 *dir = -EOPNOTSUPP;
1322 return NULL;
1323 }
1324 break;
1325 #endif
1326 default:
1327 *dir = -EINVAL;
1328 return NULL;
1329 }
1330
1331 *dir = -EINVAL;
1332
1333 if (len < sizeof(*p) ||
1334 verify_newpolicy_info(p))
1335 return NULL;
1336
1337 nr = ((len - sizeof(*p)) / sizeof(*ut));
1338 if (nr > XFRM_MAX_DEPTH)
1339 return NULL;
1340
1341 xp = xfrm_policy_alloc(GFP_KERNEL);
1342 if (xp == NULL) {
1343 *dir = -ENOBUFS;
1344 return NULL;
1345 }
1346
1347 copy_from_user_policy(xp, p);
1348 copy_templates(xp, ut, nr);
1349
1350 *dir = p->dir;
1351
1352 return xp;
1353 }
1354
1355 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1356 int dir, int hard)
1357 {
1358 struct xfrm_user_polexpire *upe;
1359 struct nlmsghdr *nlh;
1360 unsigned char *b = skb->tail;
1361
1362 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1363 upe = NLMSG_DATA(nlh);
1364 nlh->nlmsg_flags = 0;
1365
1366 copy_to_user_policy(xp, &upe->pol, dir);
1367 if (copy_to_user_tmpl(xp, skb) < 0)
1368 goto nlmsg_failure;
1369 upe->hard = !!hard;
1370
1371 nlh->nlmsg_len = skb->tail - b;
1372 return skb->len;
1373
1374 nlmsg_failure:
1375 skb_trim(skb, b - skb->data);
1376 return -1;
1377 }
1378
1379 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1380 {
1381 struct sk_buff *skb;
1382 size_t len;
1383
1384 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1385 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1386 skb = alloc_skb(len, GFP_ATOMIC);
1387 if (skb == NULL)
1388 return -ENOMEM;
1389
1390 if (build_polexpire(skb, xp, dir, c->data.hard) < 0)
1391 BUG();
1392
1393 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1394
1395 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1396 }
1397
1398 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1399 {
1400 struct xfrm_userpolicy_info *p;
1401 struct nlmsghdr *nlh;
1402 struct sk_buff *skb;
1403 unsigned char *b;
1404 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1405 len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_info));
1406
1407 skb = alloc_skb(len, GFP_ATOMIC);
1408 if (skb == NULL)
1409 return -ENOMEM;
1410 b = skb->tail;
1411
1412 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, sizeof(*p));
1413
1414 p = NLMSG_DATA(nlh);
1415
1416 nlh->nlmsg_flags = 0;
1417
1418 copy_to_user_policy(xp, p, dir);
1419 if (copy_to_user_tmpl(xp, skb) < 0)
1420 goto nlmsg_failure;
1421
1422 nlh->nlmsg_len = skb->tail - b;
1423
1424 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC);
1425
1426 nlmsg_failure:
1427 kfree_skb(skb);
1428 return -1;
1429 }
1430
1431 static int xfrm_notify_policy_flush(struct km_event *c)
1432 {
1433 struct nlmsghdr *nlh;
1434 struct sk_buff *skb;
1435 unsigned char *b;
1436 int len = NLMSG_LENGTH(0);
1437
1438 skb = alloc_skb(len, GFP_ATOMIC);
1439 if (skb == NULL)
1440 return -ENOMEM;
1441 b = skb->tail;
1442
1443
1444 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
1445
1446 nlh->nlmsg_len = skb->tail - b;
1447
1448 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC);
1449
1450 nlmsg_failure:
1451 kfree_skb(skb);
1452 return -1;
1453 }
1454
1455 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1456 {
1457
1458 switch (c->event) {
1459 case XFRM_MSG_NEWPOLICY:
1460 case XFRM_MSG_UPDPOLICY:
1461 case XFRM_MSG_DELPOLICY:
1462 return xfrm_notify_policy(xp, dir, c);
1463 case XFRM_MSG_FLUSHPOLICY:
1464 return xfrm_notify_policy_flush(c);
1465 case XFRM_MSG_POLEXPIRE:
1466 return xfrm_exp_policy_notify(xp, dir, c);
1467 default:
1468 printk("xfrm_user: Unknown Policy event %d\n", c->event);
1469 }
1470
1471 return 0;
1472
1473 }
1474
1475 static struct xfrm_mgr netlink_mgr = {
1476 .id = "netlink",
1477 .notify = xfrm_send_state_notify,
1478 .acquire = xfrm_send_acquire,
1479 .compile_policy = xfrm_compile_policy,
1480 .notify_policy = xfrm_send_policy_notify,
1481 };
1482
1483 static int __init xfrm_user_init(void)
1484 {
1485 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1486
1487 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv);
1488 if (xfrm_nl == NULL)
1489 return -ENOMEM;
1490
1491 xfrm_register_km(&netlink_mgr);
1492
1493 return 0;
1494 }
1495
1496 static void __exit xfrm_user_exit(void)
1497 {
1498 xfrm_unregister_km(&netlink_mgr);
1499 sock_release(xfrm_nl->sk_socket);
1500 }
1501
1502 module_init(xfrm_user_init);
1503 module_exit(xfrm_user_exit);
1504 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree