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