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Merge git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[mirror_ubuntu-artful-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/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.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 <net/netlink.h>
30 #include <asm/uaccess.h>
31 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
32 #include <linux/in6.h>
33 #endif
34 #include <linux/audit.h>
35
36 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
37 {
38 struct rtattr *rt = xfrma[type - 1];
39 struct xfrm_algo *algp;
40 int len;
41
42 if (!rt)
43 return 0;
44
45 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
46 if (len < 0)
47 return -EINVAL;
48
49 algp = RTA_DATA(rt);
50
51 len -= (algp->alg_key_len + 7U) / 8;
52 if (len < 0)
53 return -EINVAL;
54
55 switch (type) {
56 case XFRMA_ALG_AUTH:
57 if (!algp->alg_key_len &&
58 strcmp(algp->alg_name, "digest_null") != 0)
59 return -EINVAL;
60 break;
61
62 case XFRMA_ALG_CRYPT:
63 if (!algp->alg_key_len &&
64 strcmp(algp->alg_name, "cipher_null") != 0)
65 return -EINVAL;
66 break;
67
68 case XFRMA_ALG_COMP:
69 /* Zero length keys are legal. */
70 break;
71
72 default:
73 return -EINVAL;
74 }
75
76 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
77 return 0;
78 }
79
80 static int verify_encap_tmpl(struct rtattr **xfrma)
81 {
82 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
83 struct xfrm_encap_tmpl *encap;
84
85 if (!rt)
86 return 0;
87
88 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
89 return -EINVAL;
90
91 return 0;
92 }
93
94 static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
95 xfrm_address_t **addrp)
96 {
97 struct rtattr *rt = xfrma[type - 1];
98
99 if (!rt)
100 return 0;
101
102 if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
103 return -EINVAL;
104
105 if (addrp)
106 *addrp = RTA_DATA(rt);
107
108 return 0;
109 }
110
111 static inline int verify_sec_ctx_len(struct rtattr **xfrma)
112 {
113 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
114 struct xfrm_user_sec_ctx *uctx;
115 int len = 0;
116
117 if (!rt)
118 return 0;
119
120 if (rt->rta_len < sizeof(*uctx))
121 return -EINVAL;
122
123 uctx = RTA_DATA(rt);
124
125 len += sizeof(struct xfrm_user_sec_ctx);
126 len += uctx->ctx_len;
127
128 if (uctx->len != len)
129 return -EINVAL;
130
131 return 0;
132 }
133
134
135 static int verify_newsa_info(struct xfrm_usersa_info *p,
136 struct rtattr **xfrma)
137 {
138 int err;
139
140 err = -EINVAL;
141 switch (p->family) {
142 case AF_INET:
143 break;
144
145 case AF_INET6:
146 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
147 break;
148 #else
149 err = -EAFNOSUPPORT;
150 goto out;
151 #endif
152
153 default:
154 goto out;
155 }
156
157 err = -EINVAL;
158 switch (p->id.proto) {
159 case IPPROTO_AH:
160 if (!xfrma[XFRMA_ALG_AUTH-1] ||
161 xfrma[XFRMA_ALG_CRYPT-1] ||
162 xfrma[XFRMA_ALG_COMP-1])
163 goto out;
164 break;
165
166 case IPPROTO_ESP:
167 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
168 !xfrma[XFRMA_ALG_CRYPT-1]) ||
169 xfrma[XFRMA_ALG_COMP-1])
170 goto out;
171 break;
172
173 case IPPROTO_COMP:
174 if (!xfrma[XFRMA_ALG_COMP-1] ||
175 xfrma[XFRMA_ALG_AUTH-1] ||
176 xfrma[XFRMA_ALG_CRYPT-1])
177 goto out;
178 break;
179
180 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
181 case IPPROTO_DSTOPTS:
182 case IPPROTO_ROUTING:
183 if (xfrma[XFRMA_ALG_COMP-1] ||
184 xfrma[XFRMA_ALG_AUTH-1] ||
185 xfrma[XFRMA_ALG_CRYPT-1] ||
186 xfrma[XFRMA_ENCAP-1] ||
187 xfrma[XFRMA_SEC_CTX-1] ||
188 !xfrma[XFRMA_COADDR-1])
189 goto out;
190 break;
191 #endif
192
193 default:
194 goto out;
195 }
196
197 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
198 goto out;
199 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
200 goto out;
201 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
202 goto out;
203 if ((err = verify_encap_tmpl(xfrma)))
204 goto out;
205 if ((err = verify_sec_ctx_len(xfrma)))
206 goto out;
207 if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
208 goto out;
209
210 err = -EINVAL;
211 switch (p->mode) {
212 case XFRM_MODE_TRANSPORT:
213 case XFRM_MODE_TUNNEL:
214 case XFRM_MODE_ROUTEOPTIMIZATION:
215 case XFRM_MODE_BEET:
216 break;
217
218 default:
219 goto out;
220 }
221
222 err = 0;
223
224 out:
225 return err;
226 }
227
228 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
229 struct xfrm_algo_desc *(*get_byname)(char *, int),
230 struct rtattr *u_arg)
231 {
232 struct rtattr *rta = u_arg;
233 struct xfrm_algo *p, *ualg;
234 struct xfrm_algo_desc *algo;
235 int len;
236
237 if (!rta)
238 return 0;
239
240 ualg = RTA_DATA(rta);
241
242 algo = get_byname(ualg->alg_name, 1);
243 if (!algo)
244 return -ENOSYS;
245 *props = algo->desc.sadb_alg_id;
246
247 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
248 p = kmemdup(ualg, len, GFP_KERNEL);
249 if (!p)
250 return -ENOMEM;
251
252 strcpy(p->alg_name, algo->name);
253 *algpp = p;
254 return 0;
255 }
256
257 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
258 {
259 struct rtattr *rta = u_arg;
260 struct xfrm_encap_tmpl *p, *uencap;
261
262 if (!rta)
263 return 0;
264
265 uencap = RTA_DATA(rta);
266 p = kmemdup(uencap, sizeof(*p), GFP_KERNEL);
267 if (!p)
268 return -ENOMEM;
269
270 *encapp = p;
271 return 0;
272 }
273
274
275 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
276 {
277 int len = 0;
278
279 if (xfrm_ctx) {
280 len += sizeof(struct xfrm_user_sec_ctx);
281 len += xfrm_ctx->ctx_len;
282 }
283 return len;
284 }
285
286 static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
287 {
288 struct xfrm_user_sec_ctx *uctx;
289
290 if (!u_arg)
291 return 0;
292
293 uctx = RTA_DATA(u_arg);
294 return security_xfrm_state_alloc(x, uctx);
295 }
296
297 static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
298 {
299 struct rtattr *rta = u_arg;
300 xfrm_address_t *p, *uaddrp;
301
302 if (!rta)
303 return 0;
304
305 uaddrp = RTA_DATA(rta);
306 p = kmemdup(uaddrp, sizeof(*p), GFP_KERNEL);
307 if (!p)
308 return -ENOMEM;
309
310 *addrpp = p;
311 return 0;
312 }
313
314 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
315 {
316 memcpy(&x->id, &p->id, sizeof(x->id));
317 memcpy(&x->sel, &p->sel, sizeof(x->sel));
318 memcpy(&x->lft, &p->lft, sizeof(x->lft));
319 x->props.mode = p->mode;
320 x->props.replay_window = p->replay_window;
321 x->props.reqid = p->reqid;
322 x->props.family = p->family;
323 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
324 x->props.flags = p->flags;
325 }
326
327 /*
328 * someday when pfkey also has support, we could have the code
329 * somehow made shareable and move it to xfrm_state.c - JHS
330 *
331 */
332 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
333 {
334 int err = - EINVAL;
335 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
336 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
337 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
338 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
339
340 if (rp) {
341 struct xfrm_replay_state *replay;
342 if (RTA_PAYLOAD(rp) < sizeof(*replay))
343 goto error;
344 replay = RTA_DATA(rp);
345 memcpy(&x->replay, replay, sizeof(*replay));
346 memcpy(&x->preplay, replay, sizeof(*replay));
347 }
348
349 if (lt) {
350 struct xfrm_lifetime_cur *ltime;
351 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
352 goto error;
353 ltime = RTA_DATA(lt);
354 x->curlft.bytes = ltime->bytes;
355 x->curlft.packets = ltime->packets;
356 x->curlft.add_time = ltime->add_time;
357 x->curlft.use_time = ltime->use_time;
358 }
359
360 if (et) {
361 if (RTA_PAYLOAD(et) < sizeof(u32))
362 goto error;
363 x->replay_maxage = *(u32*)RTA_DATA(et);
364 }
365
366 if (rt) {
367 if (RTA_PAYLOAD(rt) < sizeof(u32))
368 goto error;
369 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
370 }
371
372 return 0;
373 error:
374 return err;
375 }
376
377 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
378 struct rtattr **xfrma,
379 int *errp)
380 {
381 struct xfrm_state *x = xfrm_state_alloc();
382 int err = -ENOMEM;
383
384 if (!x)
385 goto error_no_put;
386
387 copy_from_user_state(x, p);
388
389 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
390 xfrm_aalg_get_byname,
391 xfrma[XFRMA_ALG_AUTH-1])))
392 goto error;
393 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
394 xfrm_ealg_get_byname,
395 xfrma[XFRMA_ALG_CRYPT-1])))
396 goto error;
397 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
398 xfrm_calg_get_byname,
399 xfrma[XFRMA_ALG_COMP-1])))
400 goto error;
401 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
402 goto error;
403 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
404 goto error;
405 err = xfrm_init_state(x);
406 if (err)
407 goto error;
408
409 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
410 goto error;
411
412 x->km.seq = p->seq;
413 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
414 /* sysctl_xfrm_aevent_etime is in 100ms units */
415 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
416 x->preplay.bitmap = 0;
417 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
418 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
419
420 /* override default values from above */
421
422 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
423 if (err < 0)
424 goto error;
425
426 return x;
427
428 error:
429 x->km.state = XFRM_STATE_DEAD;
430 xfrm_state_put(x);
431 error_no_put:
432 *errp = err;
433 return NULL;
434 }
435
436 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
437 struct rtattr **xfrma)
438 {
439 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
440 struct xfrm_state *x;
441 int err;
442 struct km_event c;
443
444 err = verify_newsa_info(p, xfrma);
445 if (err)
446 return err;
447
448 x = xfrm_state_construct(p, xfrma, &err);
449 if (!x)
450 return err;
451
452 xfrm_state_hold(x);
453 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
454 err = xfrm_state_add(x);
455 else
456 err = xfrm_state_update(x);
457
458 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
459 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
460
461 if (err < 0) {
462 x->km.state = XFRM_STATE_DEAD;
463 __xfrm_state_put(x);
464 goto out;
465 }
466
467 c.seq = nlh->nlmsg_seq;
468 c.pid = nlh->nlmsg_pid;
469 c.event = nlh->nlmsg_type;
470
471 km_state_notify(x, &c);
472 out:
473 xfrm_state_put(x);
474 return err;
475 }
476
477 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
478 struct rtattr **xfrma,
479 int *errp)
480 {
481 struct xfrm_state *x = NULL;
482 int err;
483
484 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
485 err = -ESRCH;
486 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
487 } else {
488 xfrm_address_t *saddr = NULL;
489
490 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
491 if (err)
492 goto out;
493
494 if (!saddr) {
495 err = -EINVAL;
496 goto out;
497 }
498
499 err = -ESRCH;
500 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
501 p->family);
502 }
503
504 out:
505 if (!x && errp)
506 *errp = err;
507 return x;
508 }
509
510 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
511 struct rtattr **xfrma)
512 {
513 struct xfrm_state *x;
514 int err = -ESRCH;
515 struct km_event c;
516 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
517
518 x = xfrm_user_state_lookup(p, xfrma, &err);
519 if (x == NULL)
520 return err;
521
522 if ((err = security_xfrm_state_delete(x)) != 0)
523 goto out;
524
525 if (xfrm_state_kern(x)) {
526 err = -EPERM;
527 goto out;
528 }
529
530 err = xfrm_state_delete(x);
531
532 if (err < 0)
533 goto out;
534
535 c.seq = nlh->nlmsg_seq;
536 c.pid = nlh->nlmsg_pid;
537 c.event = nlh->nlmsg_type;
538 km_state_notify(x, &c);
539
540 out:
541 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
542 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
543 xfrm_state_put(x);
544 return err;
545 }
546
547 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
548 {
549 memcpy(&p->id, &x->id, sizeof(p->id));
550 memcpy(&p->sel, &x->sel, sizeof(p->sel));
551 memcpy(&p->lft, &x->lft, sizeof(p->lft));
552 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
553 memcpy(&p->stats, &x->stats, sizeof(p->stats));
554 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
555 p->mode = x->props.mode;
556 p->replay_window = x->props.replay_window;
557 p->reqid = x->props.reqid;
558 p->family = x->props.family;
559 p->flags = x->props.flags;
560 p->seq = x->km.seq;
561 }
562
563 struct xfrm_dump_info {
564 struct sk_buff *in_skb;
565 struct sk_buff *out_skb;
566 u32 nlmsg_seq;
567 u16 nlmsg_flags;
568 int start_idx;
569 int this_idx;
570 };
571
572 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
573 {
574 struct xfrm_dump_info *sp = ptr;
575 struct sk_buff *in_skb = sp->in_skb;
576 struct sk_buff *skb = sp->out_skb;
577 struct xfrm_usersa_info *p;
578 struct nlmsghdr *nlh;
579 unsigned char *b = skb_tail_pointer(skb);
580
581 if (sp->this_idx < sp->start_idx)
582 goto out;
583
584 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
585 sp->nlmsg_seq,
586 XFRM_MSG_NEWSA, sizeof(*p));
587 nlh->nlmsg_flags = sp->nlmsg_flags;
588
589 p = NLMSG_DATA(nlh);
590 copy_to_user_state(x, p);
591
592 if (x->aalg)
593 RTA_PUT(skb, XFRMA_ALG_AUTH,
594 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
595 if (x->ealg)
596 RTA_PUT(skb, XFRMA_ALG_CRYPT,
597 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
598 if (x->calg)
599 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
600
601 if (x->encap)
602 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
603
604 if (x->security) {
605 int ctx_size = sizeof(struct xfrm_sec_ctx) +
606 x->security->ctx_len;
607 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
608 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
609
610 uctx->exttype = XFRMA_SEC_CTX;
611 uctx->len = ctx_size;
612 uctx->ctx_doi = x->security->ctx_doi;
613 uctx->ctx_alg = x->security->ctx_alg;
614 uctx->ctx_len = x->security->ctx_len;
615 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
616 }
617
618 if (x->coaddr)
619 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
620
621 if (x->lastused)
622 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
623
624 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
625 out:
626 sp->this_idx++;
627 return 0;
628
629 nlmsg_failure:
630 rtattr_failure:
631 nlmsg_trim(skb, b);
632 return -1;
633 }
634
635 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
636 {
637 struct xfrm_dump_info info;
638
639 info.in_skb = cb->skb;
640 info.out_skb = skb;
641 info.nlmsg_seq = cb->nlh->nlmsg_seq;
642 info.nlmsg_flags = NLM_F_MULTI;
643 info.this_idx = 0;
644 info.start_idx = cb->args[0];
645 (void) xfrm_state_walk(0, dump_one_state, &info);
646 cb->args[0] = info.this_idx;
647
648 return skb->len;
649 }
650
651 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
652 struct xfrm_state *x, u32 seq)
653 {
654 struct xfrm_dump_info info;
655 struct sk_buff *skb;
656
657 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
658 if (!skb)
659 return ERR_PTR(-ENOMEM);
660
661 info.in_skb = in_skb;
662 info.out_skb = skb;
663 info.nlmsg_seq = seq;
664 info.nlmsg_flags = 0;
665 info.this_idx = info.start_idx = 0;
666
667 if (dump_one_state(x, 0, &info)) {
668 kfree_skb(skb);
669 return NULL;
670 }
671
672 return skb;
673 }
674
675 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
676 {
677 struct xfrmk_spdinfo si;
678 struct xfrmu_spdinfo spc;
679 struct xfrmu_spdhinfo sph;
680 struct nlmsghdr *nlh;
681 u32 *f;
682
683 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
684 if (nlh == NULL) /* shouldnt really happen ... */
685 return -EMSGSIZE;
686
687 f = nlmsg_data(nlh);
688 *f = flags;
689 xfrm_spd_getinfo(&si);
690 spc.incnt = si.incnt;
691 spc.outcnt = si.outcnt;
692 spc.fwdcnt = si.fwdcnt;
693 spc.inscnt = si.inscnt;
694 spc.outscnt = si.outscnt;
695 spc.fwdscnt = si.fwdscnt;
696 sph.spdhcnt = si.spdhcnt;
697 sph.spdhmcnt = si.spdhmcnt;
698
699 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
700 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
701
702 return nlmsg_end(skb, nlh);
703
704 nla_put_failure:
705 nlmsg_cancel(skb, nlh);
706 return -EMSGSIZE;
707 }
708
709 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
710 struct rtattr **xfrma)
711 {
712 struct sk_buff *r_skb;
713 u32 *flags = NLMSG_DATA(nlh);
714 u32 spid = NETLINK_CB(skb).pid;
715 u32 seq = nlh->nlmsg_seq;
716 int len = NLMSG_LENGTH(sizeof(u32));
717
718 len += RTA_SPACE(sizeof(struct xfrmu_spdinfo));
719 len += RTA_SPACE(sizeof(struct xfrmu_spdhinfo));
720
721 r_skb = alloc_skb(len, GFP_ATOMIC);
722 if (r_skb == NULL)
723 return -ENOMEM;
724
725 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
726 BUG();
727
728 return nlmsg_unicast(xfrm_nl, r_skb, spid);
729 }
730
731 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
732 {
733 struct xfrmk_sadinfo si;
734 struct xfrmu_sadhinfo sh;
735 struct nlmsghdr *nlh;
736 u32 *f;
737
738 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
739 if (nlh == NULL) /* shouldnt really happen ... */
740 return -EMSGSIZE;
741
742 f = nlmsg_data(nlh);
743 *f = flags;
744 xfrm_sad_getinfo(&si);
745
746 sh.sadhmcnt = si.sadhmcnt;
747 sh.sadhcnt = si.sadhcnt;
748
749 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
750 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
751
752 return nlmsg_end(skb, nlh);
753
754 nla_put_failure:
755 nlmsg_cancel(skb, nlh);
756 return -EMSGSIZE;
757 }
758
759 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
760 struct rtattr **xfrma)
761 {
762 struct sk_buff *r_skb;
763 u32 *flags = NLMSG_DATA(nlh);
764 u32 spid = NETLINK_CB(skb).pid;
765 u32 seq = nlh->nlmsg_seq;
766 int len = NLMSG_LENGTH(sizeof(u32));
767
768 len += RTA_SPACE(sizeof(struct xfrmu_sadhinfo));
769 len += RTA_SPACE(sizeof(u32));
770
771 r_skb = alloc_skb(len, GFP_ATOMIC);
772
773 if (r_skb == NULL)
774 return -ENOMEM;
775
776 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
777 BUG();
778
779 return nlmsg_unicast(xfrm_nl, r_skb, spid);
780 }
781
782 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
783 struct rtattr **xfrma)
784 {
785 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
786 struct xfrm_state *x;
787 struct sk_buff *resp_skb;
788 int err = -ESRCH;
789
790 x = xfrm_user_state_lookup(p, xfrma, &err);
791 if (x == NULL)
792 goto out_noput;
793
794 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
795 if (IS_ERR(resp_skb)) {
796 err = PTR_ERR(resp_skb);
797 } else {
798 err = netlink_unicast(xfrm_nl, resp_skb,
799 NETLINK_CB(skb).pid, MSG_DONTWAIT);
800 }
801 xfrm_state_put(x);
802 out_noput:
803 return err;
804 }
805
806 static int verify_userspi_info(struct xfrm_userspi_info *p)
807 {
808 switch (p->info.id.proto) {
809 case IPPROTO_AH:
810 case IPPROTO_ESP:
811 break;
812
813 case IPPROTO_COMP:
814 /* IPCOMP spi is 16-bits. */
815 if (p->max >= 0x10000)
816 return -EINVAL;
817 break;
818
819 default:
820 return -EINVAL;
821 }
822
823 if (p->min > p->max)
824 return -EINVAL;
825
826 return 0;
827 }
828
829 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
830 struct rtattr **xfrma)
831 {
832 struct xfrm_state *x;
833 struct xfrm_userspi_info *p;
834 struct sk_buff *resp_skb;
835 xfrm_address_t *daddr;
836 int family;
837 int err;
838
839 p = NLMSG_DATA(nlh);
840 err = verify_userspi_info(p);
841 if (err)
842 goto out_noput;
843
844 family = p->info.family;
845 daddr = &p->info.id.daddr;
846
847 x = NULL;
848 if (p->info.seq) {
849 x = xfrm_find_acq_byseq(p->info.seq);
850 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
851 xfrm_state_put(x);
852 x = NULL;
853 }
854 }
855
856 if (!x)
857 x = xfrm_find_acq(p->info.mode, p->info.reqid,
858 p->info.id.proto, daddr,
859 &p->info.saddr, 1,
860 family);
861 err = -ENOENT;
862 if (x == NULL)
863 goto out_noput;
864
865 resp_skb = ERR_PTR(-ENOENT);
866
867 spin_lock_bh(&x->lock);
868 if (x->km.state != XFRM_STATE_DEAD) {
869 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
870 if (x->id.spi)
871 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
872 }
873 spin_unlock_bh(&x->lock);
874
875 if (IS_ERR(resp_skb)) {
876 err = PTR_ERR(resp_skb);
877 goto out;
878 }
879
880 err = netlink_unicast(xfrm_nl, resp_skb,
881 NETLINK_CB(skb).pid, MSG_DONTWAIT);
882
883 out:
884 xfrm_state_put(x);
885 out_noput:
886 return err;
887 }
888
889 static int verify_policy_dir(u8 dir)
890 {
891 switch (dir) {
892 case XFRM_POLICY_IN:
893 case XFRM_POLICY_OUT:
894 case XFRM_POLICY_FWD:
895 break;
896
897 default:
898 return -EINVAL;
899 }
900
901 return 0;
902 }
903
904 static int verify_policy_type(u8 type)
905 {
906 switch (type) {
907 case XFRM_POLICY_TYPE_MAIN:
908 #ifdef CONFIG_XFRM_SUB_POLICY
909 case XFRM_POLICY_TYPE_SUB:
910 #endif
911 break;
912
913 default:
914 return -EINVAL;
915 }
916
917 return 0;
918 }
919
920 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
921 {
922 switch (p->share) {
923 case XFRM_SHARE_ANY:
924 case XFRM_SHARE_SESSION:
925 case XFRM_SHARE_USER:
926 case XFRM_SHARE_UNIQUE:
927 break;
928
929 default:
930 return -EINVAL;
931 }
932
933 switch (p->action) {
934 case XFRM_POLICY_ALLOW:
935 case XFRM_POLICY_BLOCK:
936 break;
937
938 default:
939 return -EINVAL;
940 }
941
942 switch (p->sel.family) {
943 case AF_INET:
944 break;
945
946 case AF_INET6:
947 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
948 break;
949 #else
950 return -EAFNOSUPPORT;
951 #endif
952
953 default:
954 return -EINVAL;
955 }
956
957 return verify_policy_dir(p->dir);
958 }
959
960 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
961 {
962 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
963 struct xfrm_user_sec_ctx *uctx;
964
965 if (!rt)
966 return 0;
967
968 uctx = RTA_DATA(rt);
969 return security_xfrm_policy_alloc(pol, uctx);
970 }
971
972 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
973 int nr)
974 {
975 int i;
976
977 xp->xfrm_nr = nr;
978 for (i = 0; i < nr; i++, ut++) {
979 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
980
981 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
982 memcpy(&t->saddr, &ut->saddr,
983 sizeof(xfrm_address_t));
984 t->reqid = ut->reqid;
985 t->mode = ut->mode;
986 t->share = ut->share;
987 t->optional = ut->optional;
988 t->aalgos = ut->aalgos;
989 t->ealgos = ut->ealgos;
990 t->calgos = ut->calgos;
991 t->encap_family = ut->family;
992 }
993 }
994
995 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
996 {
997 int i;
998
999 if (nr > XFRM_MAX_DEPTH)
1000 return -EINVAL;
1001
1002 for (i = 0; i < nr; i++) {
1003 /* We never validated the ut->family value, so many
1004 * applications simply leave it at zero. The check was
1005 * never made and ut->family was ignored because all
1006 * templates could be assumed to have the same family as
1007 * the policy itself. Now that we will have ipv4-in-ipv6
1008 * and ipv6-in-ipv4 tunnels, this is no longer true.
1009 */
1010 if (!ut[i].family)
1011 ut[i].family = family;
1012
1013 switch (ut[i].family) {
1014 case AF_INET:
1015 break;
1016 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1017 case AF_INET6:
1018 break;
1019 #endif
1020 default:
1021 return -EINVAL;
1022 }
1023 }
1024
1025 return 0;
1026 }
1027
1028 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
1029 {
1030 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1031
1032 if (!rt) {
1033 pol->xfrm_nr = 0;
1034 } else {
1035 struct xfrm_user_tmpl *utmpl = RTA_DATA(rt);
1036 int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
1037 int err;
1038
1039 err = validate_tmpl(nr, utmpl, pol->family);
1040 if (err)
1041 return err;
1042
1043 copy_templates(pol, RTA_DATA(rt), nr);
1044 }
1045 return 0;
1046 }
1047
1048 static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
1049 {
1050 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
1051 struct xfrm_userpolicy_type *upt;
1052 u8 type = XFRM_POLICY_TYPE_MAIN;
1053 int err;
1054
1055 if (rt) {
1056 if (rt->rta_len < sizeof(*upt))
1057 return -EINVAL;
1058
1059 upt = RTA_DATA(rt);
1060 type = upt->type;
1061 }
1062
1063 err = verify_policy_type(type);
1064 if (err)
1065 return err;
1066
1067 *tp = type;
1068 return 0;
1069 }
1070
1071 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1072 {
1073 xp->priority = p->priority;
1074 xp->index = p->index;
1075 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1076 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1077 xp->action = p->action;
1078 xp->flags = p->flags;
1079 xp->family = p->sel.family;
1080 /* XXX xp->share = p->share; */
1081 }
1082
1083 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1084 {
1085 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1086 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1087 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1088 p->priority = xp->priority;
1089 p->index = xp->index;
1090 p->sel.family = xp->family;
1091 p->dir = dir;
1092 p->action = xp->action;
1093 p->flags = xp->flags;
1094 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1095 }
1096
1097 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
1098 {
1099 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1100 int err;
1101
1102 if (!xp) {
1103 *errp = -ENOMEM;
1104 return NULL;
1105 }
1106
1107 copy_from_user_policy(xp, p);
1108
1109 err = copy_from_user_policy_type(&xp->type, xfrma);
1110 if (err)
1111 goto error;
1112
1113 if (!(err = copy_from_user_tmpl(xp, xfrma)))
1114 err = copy_from_user_sec_ctx(xp, xfrma);
1115 if (err)
1116 goto error;
1117
1118 return xp;
1119 error:
1120 *errp = err;
1121 kfree(xp);
1122 return NULL;
1123 }
1124
1125 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1126 struct rtattr **xfrma)
1127 {
1128 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
1129 struct xfrm_policy *xp;
1130 struct km_event c;
1131 int err;
1132 int excl;
1133
1134 err = verify_newpolicy_info(p);
1135 if (err)
1136 return err;
1137 err = verify_sec_ctx_len(xfrma);
1138 if (err)
1139 return err;
1140
1141 xp = xfrm_policy_construct(p, xfrma, &err);
1142 if (!xp)
1143 return err;
1144
1145 /* shouldnt excl be based on nlh flags??
1146 * Aha! this is anti-netlink really i.e more pfkey derived
1147 * in netlink excl is a flag and you wouldnt need
1148 * a type XFRM_MSG_UPDPOLICY - JHS */
1149 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1150 err = xfrm_policy_insert(p->dir, xp, excl);
1151 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1152 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1153
1154 if (err) {
1155 security_xfrm_policy_free(xp);
1156 kfree(xp);
1157 return err;
1158 }
1159
1160 c.event = nlh->nlmsg_type;
1161 c.seq = nlh->nlmsg_seq;
1162 c.pid = nlh->nlmsg_pid;
1163 km_policy_notify(xp, p->dir, &c);
1164
1165 xfrm_pol_put(xp);
1166
1167 return 0;
1168 }
1169
1170 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1171 {
1172 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1173 int i;
1174
1175 if (xp->xfrm_nr == 0)
1176 return 0;
1177
1178 for (i = 0; i < xp->xfrm_nr; i++) {
1179 struct xfrm_user_tmpl *up = &vec[i];
1180 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1181
1182 memcpy(&up->id, &kp->id, sizeof(up->id));
1183 up->family = kp->encap_family;
1184 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1185 up->reqid = kp->reqid;
1186 up->mode = kp->mode;
1187 up->share = kp->share;
1188 up->optional = kp->optional;
1189 up->aalgos = kp->aalgos;
1190 up->ealgos = kp->ealgos;
1191 up->calgos = kp->calgos;
1192 }
1193 RTA_PUT(skb, XFRMA_TMPL,
1194 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1195 vec);
1196
1197 return 0;
1198
1199 rtattr_failure:
1200 return -1;
1201 }
1202
1203 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1204 {
1205 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1206 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1207 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1208
1209 uctx->exttype = XFRMA_SEC_CTX;
1210 uctx->len = ctx_size;
1211 uctx->ctx_doi = s->ctx_doi;
1212 uctx->ctx_alg = s->ctx_alg;
1213 uctx->ctx_len = s->ctx_len;
1214 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1215 return 0;
1216
1217 rtattr_failure:
1218 return -1;
1219 }
1220
1221 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1222 {
1223 if (x->security) {
1224 return copy_sec_ctx(x->security, skb);
1225 }
1226 return 0;
1227 }
1228
1229 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1230 {
1231 if (xp->security) {
1232 return copy_sec_ctx(xp->security, skb);
1233 }
1234 return 0;
1235 }
1236
1237 #ifdef CONFIG_XFRM_SUB_POLICY
1238 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1239 {
1240 struct xfrm_userpolicy_type upt;
1241
1242 memset(&upt, 0, sizeof(upt));
1243 upt.type = type;
1244
1245 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1246
1247 return 0;
1248
1249 rtattr_failure:
1250 return -1;
1251 }
1252
1253 #else
1254 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1255 {
1256 return 0;
1257 }
1258 #endif
1259
1260 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1261 {
1262 struct xfrm_dump_info *sp = ptr;
1263 struct xfrm_userpolicy_info *p;
1264 struct sk_buff *in_skb = sp->in_skb;
1265 struct sk_buff *skb = sp->out_skb;
1266 struct nlmsghdr *nlh;
1267 unsigned char *b = skb_tail_pointer(skb);
1268
1269 if (sp->this_idx < sp->start_idx)
1270 goto out;
1271
1272 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1273 sp->nlmsg_seq,
1274 XFRM_MSG_NEWPOLICY, sizeof(*p));
1275 p = NLMSG_DATA(nlh);
1276 nlh->nlmsg_flags = sp->nlmsg_flags;
1277
1278 copy_to_user_policy(xp, p, dir);
1279 if (copy_to_user_tmpl(xp, skb) < 0)
1280 goto nlmsg_failure;
1281 if (copy_to_user_sec_ctx(xp, skb))
1282 goto nlmsg_failure;
1283 if (copy_to_user_policy_type(xp->type, skb) < 0)
1284 goto nlmsg_failure;
1285
1286 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1287 out:
1288 sp->this_idx++;
1289 return 0;
1290
1291 nlmsg_failure:
1292 nlmsg_trim(skb, b);
1293 return -1;
1294 }
1295
1296 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1297 {
1298 struct xfrm_dump_info info;
1299
1300 info.in_skb = cb->skb;
1301 info.out_skb = skb;
1302 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1303 info.nlmsg_flags = NLM_F_MULTI;
1304 info.this_idx = 0;
1305 info.start_idx = cb->args[0];
1306 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1307 #ifdef CONFIG_XFRM_SUB_POLICY
1308 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1309 #endif
1310 cb->args[0] = info.this_idx;
1311
1312 return skb->len;
1313 }
1314
1315 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1316 struct xfrm_policy *xp,
1317 int dir, u32 seq)
1318 {
1319 struct xfrm_dump_info info;
1320 struct sk_buff *skb;
1321
1322 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1323 if (!skb)
1324 return ERR_PTR(-ENOMEM);
1325
1326 info.in_skb = in_skb;
1327 info.out_skb = skb;
1328 info.nlmsg_seq = seq;
1329 info.nlmsg_flags = 0;
1330 info.this_idx = info.start_idx = 0;
1331
1332 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1333 kfree_skb(skb);
1334 return NULL;
1335 }
1336
1337 return skb;
1338 }
1339
1340 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1341 struct rtattr **xfrma)
1342 {
1343 struct xfrm_policy *xp;
1344 struct xfrm_userpolicy_id *p;
1345 u8 type = XFRM_POLICY_TYPE_MAIN;
1346 int err;
1347 struct km_event c;
1348 int delete;
1349
1350 p = NLMSG_DATA(nlh);
1351 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1352
1353 err = copy_from_user_policy_type(&type, xfrma);
1354 if (err)
1355 return err;
1356
1357 err = verify_policy_dir(p->dir);
1358 if (err)
1359 return err;
1360
1361 if (p->index)
1362 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1363 else {
1364 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1365 struct xfrm_policy tmp;
1366
1367 err = verify_sec_ctx_len(xfrma);
1368 if (err)
1369 return err;
1370
1371 memset(&tmp, 0, sizeof(struct xfrm_policy));
1372 if (rt) {
1373 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1374
1375 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1376 return err;
1377 }
1378 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1379 delete, &err);
1380 security_xfrm_policy_free(&tmp);
1381 }
1382 if (xp == NULL)
1383 return -ENOENT;
1384
1385 if (!delete) {
1386 struct sk_buff *resp_skb;
1387
1388 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1389 if (IS_ERR(resp_skb)) {
1390 err = PTR_ERR(resp_skb);
1391 } else {
1392 err = netlink_unicast(xfrm_nl, resp_skb,
1393 NETLINK_CB(skb).pid,
1394 MSG_DONTWAIT);
1395 }
1396 } else {
1397 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1398 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1399
1400 if (err != 0)
1401 goto out;
1402
1403 c.data.byid = p->index;
1404 c.event = nlh->nlmsg_type;
1405 c.seq = nlh->nlmsg_seq;
1406 c.pid = nlh->nlmsg_pid;
1407 km_policy_notify(xp, p->dir, &c);
1408 }
1409
1410 out:
1411 xfrm_pol_put(xp);
1412 return err;
1413 }
1414
1415 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1416 struct rtattr **xfrma)
1417 {
1418 struct km_event c;
1419 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1420 struct xfrm_audit audit_info;
1421
1422 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1423 audit_info.secid = NETLINK_CB(skb).sid;
1424 xfrm_state_flush(p->proto, &audit_info);
1425 c.data.proto = p->proto;
1426 c.event = nlh->nlmsg_type;
1427 c.seq = nlh->nlmsg_seq;
1428 c.pid = nlh->nlmsg_pid;
1429 km_state_notify(NULL, &c);
1430
1431 return 0;
1432 }
1433
1434
1435 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1436 {
1437 struct xfrm_aevent_id *id;
1438 struct nlmsghdr *nlh;
1439 struct xfrm_lifetime_cur ltime;
1440 unsigned char *b = skb_tail_pointer(skb);
1441
1442 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1443 id = NLMSG_DATA(nlh);
1444 nlh->nlmsg_flags = 0;
1445
1446 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1447 id->sa_id.spi = x->id.spi;
1448 id->sa_id.family = x->props.family;
1449 id->sa_id.proto = x->id.proto;
1450 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1451 id->reqid = x->props.reqid;
1452 id->flags = c->data.aevent;
1453
1454 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1455
1456 ltime.bytes = x->curlft.bytes;
1457 ltime.packets = x->curlft.packets;
1458 ltime.add_time = x->curlft.add_time;
1459 ltime.use_time = x->curlft.use_time;
1460
1461 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1462
1463 if (id->flags&XFRM_AE_RTHR) {
1464 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1465 }
1466
1467 if (id->flags&XFRM_AE_ETHR) {
1468 u32 etimer = x->replay_maxage*10/HZ;
1469 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1470 }
1471
1472 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1473 return skb->len;
1474
1475 rtattr_failure:
1476 nlmsg_failure:
1477 nlmsg_trim(skb, b);
1478 return -1;
1479 }
1480
1481 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1482 struct rtattr **xfrma)
1483 {
1484 struct xfrm_state *x;
1485 struct sk_buff *r_skb;
1486 int err;
1487 struct km_event c;
1488 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1489 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1490 struct xfrm_usersa_id *id = &p->sa_id;
1491
1492 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1493 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1494
1495 if (p->flags&XFRM_AE_RTHR)
1496 len+=RTA_SPACE(sizeof(u32));
1497
1498 if (p->flags&XFRM_AE_ETHR)
1499 len+=RTA_SPACE(sizeof(u32));
1500
1501 r_skb = alloc_skb(len, GFP_ATOMIC);
1502 if (r_skb == NULL)
1503 return -ENOMEM;
1504
1505 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1506 if (x == NULL) {
1507 kfree_skb(r_skb);
1508 return -ESRCH;
1509 }
1510
1511 /*
1512 * XXX: is this lock really needed - none of the other
1513 * gets lock (the concern is things getting updated
1514 * while we are still reading) - jhs
1515 */
1516 spin_lock_bh(&x->lock);
1517 c.data.aevent = p->flags;
1518 c.seq = nlh->nlmsg_seq;
1519 c.pid = nlh->nlmsg_pid;
1520
1521 if (build_aevent(r_skb, x, &c) < 0)
1522 BUG();
1523 err = netlink_unicast(xfrm_nl, r_skb,
1524 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1525 spin_unlock_bh(&x->lock);
1526 xfrm_state_put(x);
1527 return err;
1528 }
1529
1530 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1531 struct rtattr **xfrma)
1532 {
1533 struct xfrm_state *x;
1534 struct km_event c;
1535 int err = - EINVAL;
1536 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1537 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1538 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1539
1540 if (!lt && !rp)
1541 return err;
1542
1543 /* pedantic mode - thou shalt sayeth replaceth */
1544 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1545 return err;
1546
1547 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1548 if (x == NULL)
1549 return -ESRCH;
1550
1551 if (x->km.state != XFRM_STATE_VALID)
1552 goto out;
1553
1554 spin_lock_bh(&x->lock);
1555 err = xfrm_update_ae_params(x, xfrma);
1556 spin_unlock_bh(&x->lock);
1557 if (err < 0)
1558 goto out;
1559
1560 c.event = nlh->nlmsg_type;
1561 c.seq = nlh->nlmsg_seq;
1562 c.pid = nlh->nlmsg_pid;
1563 c.data.aevent = XFRM_AE_CU;
1564 km_state_notify(x, &c);
1565 err = 0;
1566 out:
1567 xfrm_state_put(x);
1568 return err;
1569 }
1570
1571 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1572 struct rtattr **xfrma)
1573 {
1574 struct km_event c;
1575 u8 type = XFRM_POLICY_TYPE_MAIN;
1576 int err;
1577 struct xfrm_audit audit_info;
1578
1579 err = copy_from_user_policy_type(&type, xfrma);
1580 if (err)
1581 return err;
1582
1583 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1584 audit_info.secid = NETLINK_CB(skb).sid;
1585 xfrm_policy_flush(type, &audit_info);
1586 c.data.type = type;
1587 c.event = nlh->nlmsg_type;
1588 c.seq = nlh->nlmsg_seq;
1589 c.pid = nlh->nlmsg_pid;
1590 km_policy_notify(NULL, 0, &c);
1591 return 0;
1592 }
1593
1594 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1595 struct rtattr **xfrma)
1596 {
1597 struct xfrm_policy *xp;
1598 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1599 struct xfrm_userpolicy_info *p = &up->pol;
1600 u8 type = XFRM_POLICY_TYPE_MAIN;
1601 int err = -ENOENT;
1602
1603 err = copy_from_user_policy_type(&type, xfrma);
1604 if (err)
1605 return err;
1606
1607 if (p->index)
1608 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1609 else {
1610 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1611 struct xfrm_policy tmp;
1612
1613 err = verify_sec_ctx_len(xfrma);
1614 if (err)
1615 return err;
1616
1617 memset(&tmp, 0, sizeof(struct xfrm_policy));
1618 if (rt) {
1619 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1620
1621 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1622 return err;
1623 }
1624 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1625 0, &err);
1626 security_xfrm_policy_free(&tmp);
1627 }
1628
1629 if (xp == NULL)
1630 return -ENOENT;
1631 read_lock(&xp->lock);
1632 if (xp->dead) {
1633 read_unlock(&xp->lock);
1634 goto out;
1635 }
1636
1637 read_unlock(&xp->lock);
1638 err = 0;
1639 if (up->hard) {
1640 xfrm_policy_delete(xp, p->dir);
1641 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1642 AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);
1643
1644 } else {
1645 // reset the timers here?
1646 printk("Dont know what to do with soft policy expire\n");
1647 }
1648 km_policy_expired(xp, p->dir, up->hard, current->pid);
1649
1650 out:
1651 xfrm_pol_put(xp);
1652 return err;
1653 }
1654
1655 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1656 struct rtattr **xfrma)
1657 {
1658 struct xfrm_state *x;
1659 int err;
1660 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1661 struct xfrm_usersa_info *p = &ue->state;
1662
1663 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1664
1665 err = -ENOENT;
1666 if (x == NULL)
1667 return err;
1668
1669 spin_lock_bh(&x->lock);
1670 err = -EINVAL;
1671 if (x->km.state != XFRM_STATE_VALID)
1672 goto out;
1673 km_state_expired(x, ue->hard, current->pid);
1674
1675 if (ue->hard) {
1676 __xfrm_state_delete(x);
1677 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1678 AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
1679 }
1680 err = 0;
1681 out:
1682 spin_unlock_bh(&x->lock);
1683 xfrm_state_put(x);
1684 return err;
1685 }
1686
1687 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1688 struct rtattr **xfrma)
1689 {
1690 struct xfrm_policy *xp;
1691 struct xfrm_user_tmpl *ut;
1692 int i;
1693 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1694
1695 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1696 struct xfrm_state *x = xfrm_state_alloc();
1697 int err = -ENOMEM;
1698
1699 if (!x)
1700 return err;
1701
1702 err = verify_newpolicy_info(&ua->policy);
1703 if (err) {
1704 printk("BAD policy passed\n");
1705 kfree(x);
1706 return err;
1707 }
1708
1709 /* build an XP */
1710 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);
1711 if (!xp) {
1712 kfree(x);
1713 return err;
1714 }
1715
1716 memcpy(&x->id, &ua->id, sizeof(ua->id));
1717 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1718 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1719
1720 ut = RTA_DATA(rt);
1721 /* extract the templates and for each call km_key */
1722 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1723 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1724 memcpy(&x->id, &t->id, sizeof(x->id));
1725 x->props.mode = t->mode;
1726 x->props.reqid = t->reqid;
1727 x->props.family = ut->family;
1728 t->aalgos = ua->aalgos;
1729 t->ealgos = ua->ealgos;
1730 t->calgos = ua->calgos;
1731 err = km_query(x, t, xp);
1732
1733 }
1734
1735 kfree(x);
1736 kfree(xp);
1737
1738 return 0;
1739 }
1740
1741 #ifdef CONFIG_XFRM_MIGRATE
1742 static int verify_user_migrate(struct rtattr **xfrma)
1743 {
1744 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1745 struct xfrm_user_migrate *um;
1746
1747 if (!rt)
1748 return -EINVAL;
1749
1750 if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
1751 return -EINVAL;
1752
1753 return 0;
1754 }
1755
1756 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1757 struct rtattr **xfrma, int *num)
1758 {
1759 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1760 struct xfrm_user_migrate *um;
1761 int i, num_migrate;
1762
1763 um = RTA_DATA(rt);
1764 num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um);
1765
1766 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1767 return -EINVAL;
1768
1769 for (i = 0; i < num_migrate; i++, um++, ma++) {
1770 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1771 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1772 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1773 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1774
1775 ma->proto = um->proto;
1776 ma->mode = um->mode;
1777 ma->reqid = um->reqid;
1778
1779 ma->old_family = um->old_family;
1780 ma->new_family = um->new_family;
1781 }
1782
1783 *num = i;
1784 return 0;
1785 }
1786
1787 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1788 struct rtattr **xfrma)
1789 {
1790 struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh);
1791 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1792 u8 type;
1793 int err;
1794 int n = 0;
1795
1796 err = verify_user_migrate((struct rtattr **)xfrma);
1797 if (err)
1798 return err;
1799
1800 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1801 if (err)
1802 return err;
1803
1804 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1805 (struct rtattr **)xfrma, &n);
1806 if (err)
1807 return err;
1808
1809 if (!n)
1810 return 0;
1811
1812 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1813
1814 return 0;
1815 }
1816 #else
1817 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1818 struct rtattr **xfrma)
1819 {
1820 return -ENOPROTOOPT;
1821 }
1822 #endif
1823
1824 #ifdef CONFIG_XFRM_MIGRATE
1825 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1826 {
1827 struct xfrm_user_migrate um;
1828
1829 memset(&um, 0, sizeof(um));
1830 um.proto = m->proto;
1831 um.mode = m->mode;
1832 um.reqid = m->reqid;
1833 um.old_family = m->old_family;
1834 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1835 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1836 um.new_family = m->new_family;
1837 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1838 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1839
1840 RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
1841 return 0;
1842
1843 rtattr_failure:
1844 return -1;
1845 }
1846
1847 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1848 int num_migrate, struct xfrm_selector *sel,
1849 u8 dir, u8 type)
1850 {
1851 struct xfrm_migrate *mp;
1852 struct xfrm_userpolicy_id *pol_id;
1853 struct nlmsghdr *nlh;
1854 unsigned char *b = skb_tail_pointer(skb);
1855 int i;
1856
1857 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
1858 pol_id = NLMSG_DATA(nlh);
1859 nlh->nlmsg_flags = 0;
1860
1861 /* copy data from selector, dir, and type to the pol_id */
1862 memset(pol_id, 0, sizeof(*pol_id));
1863 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1864 pol_id->dir = dir;
1865
1866 if (copy_to_user_policy_type(type, skb) < 0)
1867 goto nlmsg_failure;
1868
1869 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1870 if (copy_to_user_migrate(mp, skb) < 0)
1871 goto nlmsg_failure;
1872 }
1873
1874 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1875 return skb->len;
1876 nlmsg_failure:
1877 nlmsg_trim(skb, b);
1878 return -1;
1879 }
1880
1881 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1882 struct xfrm_migrate *m, int num_migrate)
1883 {
1884 struct sk_buff *skb;
1885 size_t len;
1886
1887 len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
1888 len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
1889 #ifdef CONFIG_XFRM_SUB_POLICY
1890 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
1891 #endif
1892 skb = alloc_skb(len, GFP_ATOMIC);
1893 if (skb == NULL)
1894 return -ENOMEM;
1895
1896 /* build migrate */
1897 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1898 BUG();
1899
1900 NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
1901 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE,
1902 GFP_ATOMIC);
1903 }
1904 #else
1905 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1906 struct xfrm_migrate *m, int num_migrate)
1907 {
1908 return -ENOPROTOOPT;
1909 }
1910 #endif
1911
1912 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1913
1914 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1915 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1916 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1917 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1918 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1919 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1920 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1921 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1922 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1923 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1924 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1925 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1926 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1927 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1928 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1929 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1930 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1931 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1932 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1933 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
1934 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
1935 };
1936
1937 #undef XMSGSIZE
1938
1939 static struct xfrm_link {
1940 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
1941 int (*dump)(struct sk_buff *, struct netlink_callback *);
1942 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1943 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1944 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1945 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1946 .dump = xfrm_dump_sa },
1947 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1948 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1949 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1950 .dump = xfrm_dump_policy },
1951 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1952 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1953 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1954 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1955 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1956 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1957 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1958 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1959 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1960 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1961 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1962 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1963 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1964 };
1965
1966 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1967 {
1968 struct rtattr *xfrma[XFRMA_MAX];
1969 struct xfrm_link *link;
1970 int type, min_len;
1971
1972 type = nlh->nlmsg_type;
1973 if (type > XFRM_MSG_MAX)
1974 return -EINVAL;
1975
1976 type -= XFRM_MSG_BASE;
1977 link = &xfrm_dispatch[type];
1978
1979 /* All operations require privileges, even GET */
1980 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1981 return -EPERM;
1982
1983 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1984 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1985 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1986 if (link->dump == NULL)
1987 return -EINVAL;
1988
1989 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
1990 }
1991
1992 memset(xfrma, 0, sizeof(xfrma));
1993
1994 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1995 return -EINVAL;
1996
1997 if (nlh->nlmsg_len > min_len) {
1998 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1999 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
2000
2001 while (RTA_OK(attr, attrlen)) {
2002 unsigned short flavor = attr->rta_type;
2003 if (flavor) {
2004 if (flavor > XFRMA_MAX)
2005 return -EINVAL;
2006 xfrma[flavor - 1] = attr;
2007 }
2008 attr = RTA_NEXT(attr, attrlen);
2009 }
2010 }
2011
2012 if (link->doit == NULL)
2013 return -EINVAL;
2014
2015 return link->doit(skb, nlh, xfrma);
2016 }
2017
2018 static void xfrm_netlink_rcv(struct sock *sk, int len)
2019 {
2020 unsigned int qlen = 0;
2021
2022 do {
2023 mutex_lock(&xfrm_cfg_mutex);
2024 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
2025 mutex_unlock(&xfrm_cfg_mutex);
2026
2027 } while (qlen);
2028 }
2029
2030 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
2031 {
2032 struct xfrm_user_expire *ue;
2033 struct nlmsghdr *nlh;
2034 unsigned char *b = skb_tail_pointer(skb);
2035
2036 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
2037 sizeof(*ue));
2038 ue = NLMSG_DATA(nlh);
2039 nlh->nlmsg_flags = 0;
2040
2041 copy_to_user_state(x, &ue->state);
2042 ue->hard = (c->data.hard != 0) ? 1 : 0;
2043
2044 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2045 return skb->len;
2046
2047 nlmsg_failure:
2048 nlmsg_trim(skb, b);
2049 return -1;
2050 }
2051
2052 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
2053 {
2054 struct sk_buff *skb;
2055 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
2056
2057 skb = alloc_skb(len, GFP_ATOMIC);
2058 if (skb == NULL)
2059 return -ENOMEM;
2060
2061 if (build_expire(skb, x, c) < 0)
2062 BUG();
2063
2064 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2065 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2066 }
2067
2068 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2069 {
2070 struct sk_buff *skb;
2071 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
2072
2073 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
2074 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
2075 skb = alloc_skb(len, GFP_ATOMIC);
2076 if (skb == NULL)
2077 return -ENOMEM;
2078
2079 if (build_aevent(skb, x, c) < 0)
2080 BUG();
2081
2082 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
2083 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2084 }
2085
2086 static int xfrm_notify_sa_flush(struct km_event *c)
2087 {
2088 struct xfrm_usersa_flush *p;
2089 struct nlmsghdr *nlh;
2090 struct sk_buff *skb;
2091 sk_buff_data_t b;
2092 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
2093
2094 skb = alloc_skb(len, GFP_ATOMIC);
2095 if (skb == NULL)
2096 return -ENOMEM;
2097 b = skb->tail;
2098
2099 nlh = NLMSG_PUT(skb, c->pid, c->seq,
2100 XFRM_MSG_FLUSHSA, sizeof(*p));
2101 nlh->nlmsg_flags = 0;
2102
2103 p = NLMSG_DATA(nlh);
2104 p->proto = c->data.proto;
2105
2106 nlh->nlmsg_len = skb->tail - b;
2107
2108 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2109 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2110
2111 nlmsg_failure:
2112 kfree_skb(skb);
2113 return -1;
2114 }
2115
2116 static inline int xfrm_sa_len(struct xfrm_state *x)
2117 {
2118 int l = 0;
2119 if (x->aalg)
2120 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
2121 if (x->ealg)
2122 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
2123 if (x->calg)
2124 l += RTA_SPACE(sizeof(*x->calg));
2125 if (x->encap)
2126 l += RTA_SPACE(sizeof(*x->encap));
2127
2128 return l;
2129 }
2130
2131 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2132 {
2133 struct xfrm_usersa_info *p;
2134 struct xfrm_usersa_id *id;
2135 struct nlmsghdr *nlh;
2136 struct sk_buff *skb;
2137 sk_buff_data_t b;
2138 int len = xfrm_sa_len(x);
2139 int headlen;
2140
2141 headlen = sizeof(*p);
2142 if (c->event == XFRM_MSG_DELSA) {
2143 len += RTA_SPACE(headlen);
2144 headlen = sizeof(*id);
2145 }
2146 len += NLMSG_SPACE(headlen);
2147
2148 skb = alloc_skb(len, GFP_ATOMIC);
2149 if (skb == NULL)
2150 return -ENOMEM;
2151 b = skb->tail;
2152
2153 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2154 nlh->nlmsg_flags = 0;
2155
2156 p = NLMSG_DATA(nlh);
2157 if (c->event == XFRM_MSG_DELSA) {
2158 id = NLMSG_DATA(nlh);
2159 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2160 id->spi = x->id.spi;
2161 id->family = x->props.family;
2162 id->proto = x->id.proto;
2163
2164 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
2165 }
2166
2167 copy_to_user_state(x, p);
2168
2169 if (x->aalg)
2170 RTA_PUT(skb, XFRMA_ALG_AUTH,
2171 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
2172 if (x->ealg)
2173 RTA_PUT(skb, XFRMA_ALG_CRYPT,
2174 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
2175 if (x->calg)
2176 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
2177
2178 if (x->encap)
2179 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
2180
2181 nlh->nlmsg_len = skb->tail - b;
2182
2183 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2184 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2185
2186 nlmsg_failure:
2187 rtattr_failure:
2188 kfree_skb(skb);
2189 return -1;
2190 }
2191
2192 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2193 {
2194
2195 switch (c->event) {
2196 case XFRM_MSG_EXPIRE:
2197 return xfrm_exp_state_notify(x, c);
2198 case XFRM_MSG_NEWAE:
2199 return xfrm_aevent_state_notify(x, c);
2200 case XFRM_MSG_DELSA:
2201 case XFRM_MSG_UPDSA:
2202 case XFRM_MSG_NEWSA:
2203 return xfrm_notify_sa(x, c);
2204 case XFRM_MSG_FLUSHSA:
2205 return xfrm_notify_sa_flush(c);
2206 default:
2207 printk("xfrm_user: Unknown SA event %d\n", c->event);
2208 break;
2209 }
2210
2211 return 0;
2212
2213 }
2214
2215 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2216 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2217 int dir)
2218 {
2219 struct xfrm_user_acquire *ua;
2220 struct nlmsghdr *nlh;
2221 unsigned char *b = skb_tail_pointer(skb);
2222 __u32 seq = xfrm_get_acqseq();
2223
2224 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
2225 sizeof(*ua));
2226 ua = NLMSG_DATA(nlh);
2227 nlh->nlmsg_flags = 0;
2228
2229 memcpy(&ua->id, &x->id, sizeof(ua->id));
2230 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2231 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2232 copy_to_user_policy(xp, &ua->policy, dir);
2233 ua->aalgos = xt->aalgos;
2234 ua->ealgos = xt->ealgos;
2235 ua->calgos = xt->calgos;
2236 ua->seq = x->km.seq = seq;
2237
2238 if (copy_to_user_tmpl(xp, skb) < 0)
2239 goto nlmsg_failure;
2240 if (copy_to_user_state_sec_ctx(x, skb))
2241 goto nlmsg_failure;
2242 if (copy_to_user_policy_type(xp->type, skb) < 0)
2243 goto nlmsg_failure;
2244
2245 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2246 return skb->len;
2247
2248 nlmsg_failure:
2249 nlmsg_trim(skb, b);
2250 return -1;
2251 }
2252
2253 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2254 struct xfrm_policy *xp, int dir)
2255 {
2256 struct sk_buff *skb;
2257 size_t len;
2258
2259 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2260 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
2261 len += RTA_SPACE(xfrm_user_sec_ctx_size(x->security));
2262 #ifdef CONFIG_XFRM_SUB_POLICY
2263 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2264 #endif
2265 skb = alloc_skb(len, GFP_ATOMIC);
2266 if (skb == NULL)
2267 return -ENOMEM;
2268
2269 if (build_acquire(skb, x, xt, xp, dir) < 0)
2270 BUG();
2271
2272 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
2273 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2274 }
2275
2276 /* User gives us xfrm_user_policy_info followed by an array of 0
2277 * or more templates.
2278 */
2279 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2280 u8 *data, int len, int *dir)
2281 {
2282 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2283 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2284 struct xfrm_policy *xp;
2285 int nr;
2286
2287 switch (sk->sk_family) {
2288 case AF_INET:
2289 if (opt != IP_XFRM_POLICY) {
2290 *dir = -EOPNOTSUPP;
2291 return NULL;
2292 }
2293 break;
2294 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2295 case AF_INET6:
2296 if (opt != IPV6_XFRM_POLICY) {
2297 *dir = -EOPNOTSUPP;
2298 return NULL;
2299 }
2300 break;
2301 #endif
2302 default:
2303 *dir = -EINVAL;
2304 return NULL;
2305 }
2306
2307 *dir = -EINVAL;
2308
2309 if (len < sizeof(*p) ||
2310 verify_newpolicy_info(p))
2311 return NULL;
2312
2313 nr = ((len - sizeof(*p)) / sizeof(*ut));
2314 if (validate_tmpl(nr, ut, p->sel.family))
2315 return NULL;
2316
2317 if (p->dir > XFRM_POLICY_OUT)
2318 return NULL;
2319
2320 xp = xfrm_policy_alloc(GFP_KERNEL);
2321 if (xp == NULL) {
2322 *dir = -ENOBUFS;
2323 return NULL;
2324 }
2325
2326 copy_from_user_policy(xp, p);
2327 xp->type = XFRM_POLICY_TYPE_MAIN;
2328 copy_templates(xp, ut, nr);
2329
2330 *dir = p->dir;
2331
2332 return xp;
2333 }
2334
2335 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2336 int dir, struct km_event *c)
2337 {
2338 struct xfrm_user_polexpire *upe;
2339 struct nlmsghdr *nlh;
2340 int hard = c->data.hard;
2341 unsigned char *b = skb_tail_pointer(skb);
2342
2343 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
2344 upe = NLMSG_DATA(nlh);
2345 nlh->nlmsg_flags = 0;
2346
2347 copy_to_user_policy(xp, &upe->pol, dir);
2348 if (copy_to_user_tmpl(xp, skb) < 0)
2349 goto nlmsg_failure;
2350 if (copy_to_user_sec_ctx(xp, skb))
2351 goto nlmsg_failure;
2352 if (copy_to_user_policy_type(xp->type, skb) < 0)
2353 goto nlmsg_failure;
2354 upe->hard = !!hard;
2355
2356 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2357 return skb->len;
2358
2359 nlmsg_failure:
2360 nlmsg_trim(skb, b);
2361 return -1;
2362 }
2363
2364 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2365 {
2366 struct sk_buff *skb;
2367 size_t len;
2368
2369 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2370 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2371 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp->security));
2372 #ifdef CONFIG_XFRM_SUB_POLICY
2373 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2374 #endif
2375 skb = alloc_skb(len, GFP_ATOMIC);
2376 if (skb == NULL)
2377 return -ENOMEM;
2378
2379 if (build_polexpire(skb, xp, dir, c) < 0)
2380 BUG();
2381
2382 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2383 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2384 }
2385
2386 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2387 {
2388 struct xfrm_userpolicy_info *p;
2389 struct xfrm_userpolicy_id *id;
2390 struct nlmsghdr *nlh;
2391 struct sk_buff *skb;
2392 sk_buff_data_t b;
2393 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2394 int headlen;
2395
2396 headlen = sizeof(*p);
2397 if (c->event == XFRM_MSG_DELPOLICY) {
2398 len += RTA_SPACE(headlen);
2399 headlen = sizeof(*id);
2400 }
2401 #ifdef CONFIG_XFRM_SUB_POLICY
2402 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2403 #endif
2404 len += NLMSG_SPACE(headlen);
2405
2406 skb = alloc_skb(len, GFP_ATOMIC);
2407 if (skb == NULL)
2408 return -ENOMEM;
2409 b = skb->tail;
2410
2411 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2412
2413 p = NLMSG_DATA(nlh);
2414 if (c->event == XFRM_MSG_DELPOLICY) {
2415 id = NLMSG_DATA(nlh);
2416 memset(id, 0, sizeof(*id));
2417 id->dir = dir;
2418 if (c->data.byid)
2419 id->index = xp->index;
2420 else
2421 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2422
2423 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2424 }
2425
2426 nlh->nlmsg_flags = 0;
2427
2428 copy_to_user_policy(xp, p, dir);
2429 if (copy_to_user_tmpl(xp, skb) < 0)
2430 goto nlmsg_failure;
2431 if (copy_to_user_policy_type(xp->type, skb) < 0)
2432 goto nlmsg_failure;
2433
2434 nlh->nlmsg_len = skb->tail - b;
2435
2436 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2437 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2438
2439 nlmsg_failure:
2440 rtattr_failure:
2441 kfree_skb(skb);
2442 return -1;
2443 }
2444
2445 static int xfrm_notify_policy_flush(struct km_event *c)
2446 {
2447 struct nlmsghdr *nlh;
2448 struct sk_buff *skb;
2449 sk_buff_data_t b;
2450 int len = 0;
2451 #ifdef CONFIG_XFRM_SUB_POLICY
2452 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2453 #endif
2454 len += NLMSG_LENGTH(0);
2455
2456 skb = alloc_skb(len, GFP_ATOMIC);
2457 if (skb == NULL)
2458 return -ENOMEM;
2459 b = skb->tail;
2460
2461
2462 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2463 nlh->nlmsg_flags = 0;
2464 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2465 goto nlmsg_failure;
2466
2467 nlh->nlmsg_len = skb->tail - b;
2468
2469 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2470 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2471
2472 nlmsg_failure:
2473 kfree_skb(skb);
2474 return -1;
2475 }
2476
2477 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2478 {
2479
2480 switch (c->event) {
2481 case XFRM_MSG_NEWPOLICY:
2482 case XFRM_MSG_UPDPOLICY:
2483 case XFRM_MSG_DELPOLICY:
2484 return xfrm_notify_policy(xp, dir, c);
2485 case XFRM_MSG_FLUSHPOLICY:
2486 return xfrm_notify_policy_flush(c);
2487 case XFRM_MSG_POLEXPIRE:
2488 return xfrm_exp_policy_notify(xp, dir, c);
2489 default:
2490 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2491 }
2492
2493 return 0;
2494
2495 }
2496
2497 static int build_report(struct sk_buff *skb, u8 proto,
2498 struct xfrm_selector *sel, xfrm_address_t *addr)
2499 {
2500 struct xfrm_user_report *ur;
2501 struct nlmsghdr *nlh;
2502 unsigned char *b = skb_tail_pointer(skb);
2503
2504 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2505 ur = NLMSG_DATA(nlh);
2506 nlh->nlmsg_flags = 0;
2507
2508 ur->proto = proto;
2509 memcpy(&ur->sel, sel, sizeof(ur->sel));
2510
2511 if (addr)
2512 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2513
2514 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2515 return skb->len;
2516
2517 nlmsg_failure:
2518 rtattr_failure:
2519 nlmsg_trim(skb, b);
2520 return -1;
2521 }
2522
2523 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2524 xfrm_address_t *addr)
2525 {
2526 struct sk_buff *skb;
2527 size_t len;
2528
2529 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2530 skb = alloc_skb(len, GFP_ATOMIC);
2531 if (skb == NULL)
2532 return -ENOMEM;
2533
2534 if (build_report(skb, proto, sel, addr) < 0)
2535 BUG();
2536
2537 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2538 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2539 }
2540
2541 static struct xfrm_mgr netlink_mgr = {
2542 .id = "netlink",
2543 .notify = xfrm_send_state_notify,
2544 .acquire = xfrm_send_acquire,
2545 .compile_policy = xfrm_compile_policy,
2546 .notify_policy = xfrm_send_policy_notify,
2547 .report = xfrm_send_report,
2548 .migrate = xfrm_send_migrate,
2549 };
2550
2551 static int __init xfrm_user_init(void)
2552 {
2553 struct sock *nlsk;
2554
2555 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2556
2557 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2558 xfrm_netlink_rcv, NULL, THIS_MODULE);
2559 if (nlsk == NULL)
2560 return -ENOMEM;
2561 rcu_assign_pointer(xfrm_nl, nlsk);
2562
2563 xfrm_register_km(&netlink_mgr);
2564
2565 return 0;
2566 }
2567
2568 static void __exit xfrm_user_exit(void)
2569 {
2570 struct sock *nlsk = xfrm_nl;
2571
2572 xfrm_unregister_km(&netlink_mgr);
2573 rcu_assign_pointer(xfrm_nl, NULL);
2574 synchronize_rcu();
2575 sock_release(nlsk->sk_socket);
2576 }
2577
2578 module_init(xfrm_user_init);
2579 module_exit(xfrm_user_exit);
2580 MODULE_LICENSE("GPL");
2581 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2582
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