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e1000: Add device IDs of blade version of the 82571 quad port
[pv_ops_mirror.git] / net / xfrm / xfrm_user.c
blob61339e17a0f5dd52bb3ba69f24b47366833d5dc4
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 * Set inner address family if the KM left it as zero.
328 * See comment in validate_tmpl.
329 */
330 if (!x->sel.family)
331 x->sel.family = p->family;
332 }
333
334 /*
335 * someday when pfkey also has support, we could have the code
336 * somehow made shareable and move it to xfrm_state.c - JHS
337 *
338 */
339 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
340 {
341 int err = - EINVAL;
342 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
343 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
344 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
345 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
346
347 if (rp) {
348 struct xfrm_replay_state *replay;
349 if (RTA_PAYLOAD(rp) < sizeof(*replay))
350 goto error;
351 replay = RTA_DATA(rp);
352 memcpy(&x->replay, replay, sizeof(*replay));
353 memcpy(&x->preplay, replay, sizeof(*replay));
354 }
355
356 if (lt) {
357 struct xfrm_lifetime_cur *ltime;
358 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
359 goto error;
360 ltime = RTA_DATA(lt);
361 x->curlft.bytes = ltime->bytes;
362 x->curlft.packets = ltime->packets;
363 x->curlft.add_time = ltime->add_time;
364 x->curlft.use_time = ltime->use_time;
365 }
366
367 if (et) {
368 if (RTA_PAYLOAD(et) < sizeof(u32))
369 goto error;
370 x->replay_maxage = *(u32*)RTA_DATA(et);
371 }
372
373 if (rt) {
374 if (RTA_PAYLOAD(rt) < sizeof(u32))
375 goto error;
376 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
377 }
378
379 return 0;
380 error:
381 return err;
382 }
383
384 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
385 struct rtattr **xfrma,
386 int *errp)
387 {
388 struct xfrm_state *x = xfrm_state_alloc();
389 int err = -ENOMEM;
390
391 if (!x)
392 goto error_no_put;
393
394 copy_from_user_state(x, p);
395
396 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
397 xfrm_aalg_get_byname,
398 xfrma[XFRMA_ALG_AUTH-1])))
399 goto error;
400 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
401 xfrm_ealg_get_byname,
402 xfrma[XFRMA_ALG_CRYPT-1])))
403 goto error;
404 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
405 xfrm_calg_get_byname,
406 xfrma[XFRMA_ALG_COMP-1])))
407 goto error;
408 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
409 goto error;
410 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
411 goto error;
412 err = xfrm_init_state(x);
413 if (err)
414 goto error;
415
416 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
417 goto error;
418
419 x->km.seq = p->seq;
420 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
421 /* sysctl_xfrm_aevent_etime is in 100ms units */
422 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
423 x->preplay.bitmap = 0;
424 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
425 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
426
427 /* override default values from above */
428
429 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
430 if (err < 0)
431 goto error;
432
433 return x;
434
435 error:
436 x->km.state = XFRM_STATE_DEAD;
437 xfrm_state_put(x);
438 error_no_put:
439 *errp = err;
440 return NULL;
441 }
442
443 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
444 struct rtattr **xfrma)
445 {
446 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
447 struct xfrm_state *x;
448 int err;
449 struct km_event c;
450
451 err = verify_newsa_info(p, xfrma);
452 if (err)
453 return err;
454
455 x = xfrm_state_construct(p, xfrma, &err);
456 if (!x)
457 return err;
458
459 xfrm_state_hold(x);
460 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
461 err = xfrm_state_add(x);
462 else
463 err = xfrm_state_update(x);
464
465 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
466 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
467
468 if (err < 0) {
469 x->km.state = XFRM_STATE_DEAD;
470 __xfrm_state_put(x);
471 goto out;
472 }
473
474 c.seq = nlh->nlmsg_seq;
475 c.pid = nlh->nlmsg_pid;
476 c.event = nlh->nlmsg_type;
477
478 km_state_notify(x, &c);
479 out:
480 xfrm_state_put(x);
481 return err;
482 }
483
484 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
485 struct rtattr **xfrma,
486 int *errp)
487 {
488 struct xfrm_state *x = NULL;
489 int err;
490
491 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
492 err = -ESRCH;
493 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
494 } else {
495 xfrm_address_t *saddr = NULL;
496
497 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
498 if (err)
499 goto out;
500
501 if (!saddr) {
502 err = -EINVAL;
503 goto out;
504 }
505
506 err = -ESRCH;
507 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
508 p->family);
509 }
510
511 out:
512 if (!x && errp)
513 *errp = err;
514 return x;
515 }
516
517 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
518 struct rtattr **xfrma)
519 {
520 struct xfrm_state *x;
521 int err = -ESRCH;
522 struct km_event c;
523 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
524
525 x = xfrm_user_state_lookup(p, xfrma, &err);
526 if (x == NULL)
527 return err;
528
529 if ((err = security_xfrm_state_delete(x)) != 0)
530 goto out;
531
532 if (xfrm_state_kern(x)) {
533 err = -EPERM;
534 goto out;
535 }
536
537 err = xfrm_state_delete(x);
538
539 if (err < 0)
540 goto out;
541
542 c.seq = nlh->nlmsg_seq;
543 c.pid = nlh->nlmsg_pid;
544 c.event = nlh->nlmsg_type;
545 km_state_notify(x, &c);
546
547 out:
548 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
549 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
550 xfrm_state_put(x);
551 return err;
552 }
553
554 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
555 {
556 memcpy(&p->id, &x->id, sizeof(p->id));
557 memcpy(&p->sel, &x->sel, sizeof(p->sel));
558 memcpy(&p->lft, &x->lft, sizeof(p->lft));
559 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
560 memcpy(&p->stats, &x->stats, sizeof(p->stats));
561 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
562 p->mode = x->props.mode;
563 p->replay_window = x->props.replay_window;
564 p->reqid = x->props.reqid;
565 p->family = x->props.family;
566 p->flags = x->props.flags;
567 p->seq = x->km.seq;
568 }
569
570 struct xfrm_dump_info {
571 struct sk_buff *in_skb;
572 struct sk_buff *out_skb;
573 u32 nlmsg_seq;
574 u16 nlmsg_flags;
575 int start_idx;
576 int this_idx;
577 };
578
579 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
580 {
581 struct xfrm_dump_info *sp = ptr;
582 struct sk_buff *in_skb = sp->in_skb;
583 struct sk_buff *skb = sp->out_skb;
584 struct xfrm_usersa_info *p;
585 struct nlmsghdr *nlh;
586 unsigned char *b = skb_tail_pointer(skb);
587
588 if (sp->this_idx < sp->start_idx)
589 goto out;
590
591 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
592 sp->nlmsg_seq,
593 XFRM_MSG_NEWSA, sizeof(*p));
594 nlh->nlmsg_flags = sp->nlmsg_flags;
595
596 p = NLMSG_DATA(nlh);
597 copy_to_user_state(x, p);
598
599 if (x->aalg)
600 RTA_PUT(skb, XFRMA_ALG_AUTH,
601 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
602 if (x->ealg)
603 RTA_PUT(skb, XFRMA_ALG_CRYPT,
604 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
605 if (x->calg)
606 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
607
608 if (x->encap)
609 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
610
611 if (x->security) {
612 int ctx_size = sizeof(struct xfrm_sec_ctx) +
613 x->security->ctx_len;
614 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
615 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
616
617 uctx->exttype = XFRMA_SEC_CTX;
618 uctx->len = ctx_size;
619 uctx->ctx_doi = x->security->ctx_doi;
620 uctx->ctx_alg = x->security->ctx_alg;
621 uctx->ctx_len = x->security->ctx_len;
622 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
623 }
624
625 if (x->coaddr)
626 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
627
628 if (x->lastused)
629 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
630
631 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
632 out:
633 sp->this_idx++;
634 return 0;
635
636 nlmsg_failure:
637 rtattr_failure:
638 nlmsg_trim(skb, b);
639 return -1;
640 }
641
642 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
643 {
644 struct xfrm_dump_info info;
645
646 info.in_skb = cb->skb;
647 info.out_skb = skb;
648 info.nlmsg_seq = cb->nlh->nlmsg_seq;
649 info.nlmsg_flags = NLM_F_MULTI;
650 info.this_idx = 0;
651 info.start_idx = cb->args[0];
652 (void) xfrm_state_walk(0, dump_one_state, &info);
653 cb->args[0] = info.this_idx;
654
655 return skb->len;
656 }
657
658 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
659 struct xfrm_state *x, u32 seq)
660 {
661 struct xfrm_dump_info info;
662 struct sk_buff *skb;
663
664 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
665 if (!skb)
666 return ERR_PTR(-ENOMEM);
667
668 info.in_skb = in_skb;
669 info.out_skb = skb;
670 info.nlmsg_seq = seq;
671 info.nlmsg_flags = 0;
672 info.this_idx = info.start_idx = 0;
673
674 if (dump_one_state(x, 0, &info)) {
675 kfree_skb(skb);
676 return NULL;
677 }
678
679 return skb;
680 }
681
682 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
683 {
684 struct xfrmk_spdinfo si;
685 struct xfrmu_spdinfo spc;
686 struct xfrmu_spdhinfo sph;
687 struct nlmsghdr *nlh;
688 u32 *f;
689
690 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
691 if (nlh == NULL) /* shouldnt really happen ... */
692 return -EMSGSIZE;
693
694 f = nlmsg_data(nlh);
695 *f = flags;
696 xfrm_spd_getinfo(&si);
697 spc.incnt = si.incnt;
698 spc.outcnt = si.outcnt;
699 spc.fwdcnt = si.fwdcnt;
700 spc.inscnt = si.inscnt;
701 spc.outscnt = si.outscnt;
702 spc.fwdscnt = si.fwdscnt;
703 sph.spdhcnt = si.spdhcnt;
704 sph.spdhmcnt = si.spdhmcnt;
705
706 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
707 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
708
709 return nlmsg_end(skb, nlh);
710
711 nla_put_failure:
712 nlmsg_cancel(skb, nlh);
713 return -EMSGSIZE;
714 }
715
716 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
717 struct rtattr **xfrma)
718 {
719 struct sk_buff *r_skb;
720 u32 *flags = NLMSG_DATA(nlh);
721 u32 spid = NETLINK_CB(skb).pid;
722 u32 seq = nlh->nlmsg_seq;
723 int len = NLMSG_LENGTH(sizeof(u32));
724
725 len += RTA_SPACE(sizeof(struct xfrmu_spdinfo));
726 len += RTA_SPACE(sizeof(struct xfrmu_spdhinfo));
727
728 r_skb = alloc_skb(len, GFP_ATOMIC);
729 if (r_skb == NULL)
730 return -ENOMEM;
731
732 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
733 BUG();
734
735 return nlmsg_unicast(xfrm_nl, r_skb, spid);
736 }
737
738 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
739 {
740 struct xfrmk_sadinfo si;
741 struct xfrmu_sadhinfo sh;
742 struct nlmsghdr *nlh;
743 u32 *f;
744
745 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
746 if (nlh == NULL) /* shouldnt really happen ... */
747 return -EMSGSIZE;
748
749 f = nlmsg_data(nlh);
750 *f = flags;
751 xfrm_sad_getinfo(&si);
752
753 sh.sadhmcnt = si.sadhmcnt;
754 sh.sadhcnt = si.sadhcnt;
755
756 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
757 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
758
759 return nlmsg_end(skb, nlh);
760
761 nla_put_failure:
762 nlmsg_cancel(skb, nlh);
763 return -EMSGSIZE;
764 }
765
766 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
767 struct rtattr **xfrma)
768 {
769 struct sk_buff *r_skb;
770 u32 *flags = NLMSG_DATA(nlh);
771 u32 spid = NETLINK_CB(skb).pid;
772 u32 seq = nlh->nlmsg_seq;
773 int len = NLMSG_LENGTH(sizeof(u32));
774
775 len += RTA_SPACE(sizeof(struct xfrmu_sadhinfo));
776 len += RTA_SPACE(sizeof(u32));
777
778 r_skb = alloc_skb(len, GFP_ATOMIC);
779
780 if (r_skb == NULL)
781 return -ENOMEM;
782
783 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
784 BUG();
785
786 return nlmsg_unicast(xfrm_nl, r_skb, spid);
787 }
788
789 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
790 struct rtattr **xfrma)
791 {
792 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
793 struct xfrm_state *x;
794 struct sk_buff *resp_skb;
795 int err = -ESRCH;
796
797 x = xfrm_user_state_lookup(p, xfrma, &err);
798 if (x == NULL)
799 goto out_noput;
800
801 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
802 if (IS_ERR(resp_skb)) {
803 err = PTR_ERR(resp_skb);
804 } else {
805 err = netlink_unicast(xfrm_nl, resp_skb,
806 NETLINK_CB(skb).pid, MSG_DONTWAIT);
807 }
808 xfrm_state_put(x);
809 out_noput:
810 return err;
811 }
812
813 static int verify_userspi_info(struct xfrm_userspi_info *p)
814 {
815 switch (p->info.id.proto) {
816 case IPPROTO_AH:
817 case IPPROTO_ESP:
818 break;
819
820 case IPPROTO_COMP:
821 /* IPCOMP spi is 16-bits. */
822 if (p->max >= 0x10000)
823 return -EINVAL;
824 break;
825
826 default:
827 return -EINVAL;
828 }
829
830 if (p->min > p->max)
831 return -EINVAL;
832
833 return 0;
834 }
835
836 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
837 struct rtattr **xfrma)
838 {
839 struct xfrm_state *x;
840 struct xfrm_userspi_info *p;
841 struct sk_buff *resp_skb;
842 xfrm_address_t *daddr;
843 int family;
844 int err;
845
846 p = NLMSG_DATA(nlh);
847 err = verify_userspi_info(p);
848 if (err)
849 goto out_noput;
850
851 family = p->info.family;
852 daddr = &p->info.id.daddr;
853
854 x = NULL;
855 if (p->info.seq) {
856 x = xfrm_find_acq_byseq(p->info.seq);
857 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
858 xfrm_state_put(x);
859 x = NULL;
860 }
861 }
862
863 if (!x)
864 x = xfrm_find_acq(p->info.mode, p->info.reqid,
865 p->info.id.proto, daddr,
866 &p->info.saddr, 1,
867 family);
868 err = -ENOENT;
869 if (x == NULL)
870 goto out_noput;
871
872 resp_skb = ERR_PTR(-ENOENT);
873
874 spin_lock_bh(&x->lock);
875 if (x->km.state != XFRM_STATE_DEAD) {
876 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
877 if (x->id.spi)
878 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
879 }
880 spin_unlock_bh(&x->lock);
881
882 if (IS_ERR(resp_skb)) {
883 err = PTR_ERR(resp_skb);
884 goto out;
885 }
886
887 err = netlink_unicast(xfrm_nl, resp_skb,
888 NETLINK_CB(skb).pid, MSG_DONTWAIT);
889
890 out:
891 xfrm_state_put(x);
892 out_noput:
893 return err;
894 }
895
896 static int verify_policy_dir(u8 dir)
897 {
898 switch (dir) {
899 case XFRM_POLICY_IN:
900 case XFRM_POLICY_OUT:
901 case XFRM_POLICY_FWD:
902 break;
903
904 default:
905 return -EINVAL;
906 }
907
908 return 0;
909 }
910
911 static int verify_policy_type(u8 type)
912 {
913 switch (type) {
914 case XFRM_POLICY_TYPE_MAIN:
915 #ifdef CONFIG_XFRM_SUB_POLICY
916 case XFRM_POLICY_TYPE_SUB:
917 #endif
918 break;
919
920 default:
921 return -EINVAL;
922 }
923
924 return 0;
925 }
926
927 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
928 {
929 switch (p->share) {
930 case XFRM_SHARE_ANY:
931 case XFRM_SHARE_SESSION:
932 case XFRM_SHARE_USER:
933 case XFRM_SHARE_UNIQUE:
934 break;
935
936 default:
937 return -EINVAL;
938 }
939
940 switch (p->action) {
941 case XFRM_POLICY_ALLOW:
942 case XFRM_POLICY_BLOCK:
943 break;
944
945 default:
946 return -EINVAL;
947 }
948
949 switch (p->sel.family) {
950 case AF_INET:
951 break;
952
953 case AF_INET6:
954 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
955 break;
956 #else
957 return -EAFNOSUPPORT;
958 #endif
959
960 default:
961 return -EINVAL;
962 }
963
964 return verify_policy_dir(p->dir);
965 }
966
967 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
968 {
969 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
970 struct xfrm_user_sec_ctx *uctx;
971
972 if (!rt)
973 return 0;
974
975 uctx = RTA_DATA(rt);
976 return security_xfrm_policy_alloc(pol, uctx);
977 }
978
979 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
980 int nr)
981 {
982 int i;
983
984 xp->xfrm_nr = nr;
985 for (i = 0; i < nr; i++, ut++) {
986 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
987
988 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
989 memcpy(&t->saddr, &ut->saddr,
990 sizeof(xfrm_address_t));
991 t->reqid = ut->reqid;
992 t->mode = ut->mode;
993 t->share = ut->share;
994 t->optional = ut->optional;
995 t->aalgos = ut->aalgos;
996 t->ealgos = ut->ealgos;
997 t->calgos = ut->calgos;
998 t->encap_family = ut->family;
999 }
1000 }
1001
1002 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1003 {
1004 int i;
1005
1006 if (nr > XFRM_MAX_DEPTH)
1007 return -EINVAL;
1008
1009 for (i = 0; i < nr; i++) {
1010 /* We never validated the ut->family value, so many
1011 * applications simply leave it at zero. The check was
1012 * never made and ut->family was ignored because all
1013 * templates could be assumed to have the same family as
1014 * the policy itself. Now that we will have ipv4-in-ipv6
1015 * and ipv6-in-ipv4 tunnels, this is no longer true.
1016 */
1017 if (!ut[i].family)
1018 ut[i].family = family;
1019
1020 switch (ut[i].family) {
1021 case AF_INET:
1022 break;
1023 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1024 case AF_INET6:
1025 break;
1026 #endif
1027 default:
1028 return -EINVAL;
1029 }
1030 }
1031
1032 return 0;
1033 }
1034
1035 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
1036 {
1037 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1038
1039 if (!rt) {
1040 pol->xfrm_nr = 0;
1041 } else {
1042 struct xfrm_user_tmpl *utmpl = RTA_DATA(rt);
1043 int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
1044 int err;
1045
1046 err = validate_tmpl(nr, utmpl, pol->family);
1047 if (err)
1048 return err;
1049
1050 copy_templates(pol, RTA_DATA(rt), nr);
1051 }
1052 return 0;
1053 }
1054
1055 static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
1056 {
1057 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
1058 struct xfrm_userpolicy_type *upt;
1059 u8 type = XFRM_POLICY_TYPE_MAIN;
1060 int err;
1061
1062 if (rt) {
1063 if (rt->rta_len < sizeof(*upt))
1064 return -EINVAL;
1065
1066 upt = RTA_DATA(rt);
1067 type = upt->type;
1068 }
1069
1070 err = verify_policy_type(type);
1071 if (err)
1072 return err;
1073
1074 *tp = type;
1075 return 0;
1076 }
1077
1078 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1079 {
1080 xp->priority = p->priority;
1081 xp->index = p->index;
1082 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1083 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1084 xp->action = p->action;
1085 xp->flags = p->flags;
1086 xp->family = p->sel.family;
1087 /* XXX xp->share = p->share; */
1088 }
1089
1090 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1091 {
1092 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1093 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1094 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1095 p->priority = xp->priority;
1096 p->index = xp->index;
1097 p->sel.family = xp->family;
1098 p->dir = dir;
1099 p->action = xp->action;
1100 p->flags = xp->flags;
1101 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1102 }
1103
1104 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
1105 {
1106 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1107 int err;
1108
1109 if (!xp) {
1110 *errp = -ENOMEM;
1111 return NULL;
1112 }
1113
1114 copy_from_user_policy(xp, p);
1115
1116 err = copy_from_user_policy_type(&xp->type, xfrma);
1117 if (err)
1118 goto error;
1119
1120 if (!(err = copy_from_user_tmpl(xp, xfrma)))
1121 err = copy_from_user_sec_ctx(xp, xfrma);
1122 if (err)
1123 goto error;
1124
1125 return xp;
1126 error:
1127 *errp = err;
1128 kfree(xp);
1129 return NULL;
1130 }
1131
1132 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1133 struct rtattr **xfrma)
1134 {
1135 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
1136 struct xfrm_policy *xp;
1137 struct km_event c;
1138 int err;
1139 int excl;
1140
1141 err = verify_newpolicy_info(p);
1142 if (err)
1143 return err;
1144 err = verify_sec_ctx_len(xfrma);
1145 if (err)
1146 return err;
1147
1148 xp = xfrm_policy_construct(p, xfrma, &err);
1149 if (!xp)
1150 return err;
1151
1152 /* shouldnt excl be based on nlh flags??
1153 * Aha! this is anti-netlink really i.e more pfkey derived
1154 * in netlink excl is a flag and you wouldnt need
1155 * a type XFRM_MSG_UPDPOLICY - JHS */
1156 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1157 err = xfrm_policy_insert(p->dir, xp, excl);
1158 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1159 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1160
1161 if (err) {
1162 security_xfrm_policy_free(xp);
1163 kfree(xp);
1164 return err;
1165 }
1166
1167 c.event = nlh->nlmsg_type;
1168 c.seq = nlh->nlmsg_seq;
1169 c.pid = nlh->nlmsg_pid;
1170 km_policy_notify(xp, p->dir, &c);
1171
1172 xfrm_pol_put(xp);
1173
1174 return 0;
1175 }
1176
1177 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1178 {
1179 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1180 int i;
1181
1182 if (xp->xfrm_nr == 0)
1183 return 0;
1184
1185 for (i = 0; i < xp->xfrm_nr; i++) {
1186 struct xfrm_user_tmpl *up = &vec[i];
1187 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1188
1189 memcpy(&up->id, &kp->id, sizeof(up->id));
1190 up->family = kp->encap_family;
1191 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1192 up->reqid = kp->reqid;
1193 up->mode = kp->mode;
1194 up->share = kp->share;
1195 up->optional = kp->optional;
1196 up->aalgos = kp->aalgos;
1197 up->ealgos = kp->ealgos;
1198 up->calgos = kp->calgos;
1199 }
1200 RTA_PUT(skb, XFRMA_TMPL,
1201 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1202 vec);
1203
1204 return 0;
1205
1206 rtattr_failure:
1207 return -1;
1208 }
1209
1210 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1211 {
1212 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1213 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1214 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1215
1216 uctx->exttype = XFRMA_SEC_CTX;
1217 uctx->len = ctx_size;
1218 uctx->ctx_doi = s->ctx_doi;
1219 uctx->ctx_alg = s->ctx_alg;
1220 uctx->ctx_len = s->ctx_len;
1221 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1222 return 0;
1223
1224 rtattr_failure:
1225 return -1;
1226 }
1227
1228 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1229 {
1230 if (x->security) {
1231 return copy_sec_ctx(x->security, skb);
1232 }
1233 return 0;
1234 }
1235
1236 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1237 {
1238 if (xp->security) {
1239 return copy_sec_ctx(xp->security, skb);
1240 }
1241 return 0;
1242 }
1243
1244 #ifdef CONFIG_XFRM_SUB_POLICY
1245 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1246 {
1247 struct xfrm_userpolicy_type upt;
1248
1249 memset(&upt, 0, sizeof(upt));
1250 upt.type = type;
1251
1252 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1253
1254 return 0;
1255
1256 rtattr_failure:
1257 return -1;
1258 }
1259
1260 #else
1261 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1262 {
1263 return 0;
1264 }
1265 #endif
1266
1267 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1268 {
1269 struct xfrm_dump_info *sp = ptr;
1270 struct xfrm_userpolicy_info *p;
1271 struct sk_buff *in_skb = sp->in_skb;
1272 struct sk_buff *skb = sp->out_skb;
1273 struct nlmsghdr *nlh;
1274 unsigned char *b = skb_tail_pointer(skb);
1275
1276 if (sp->this_idx < sp->start_idx)
1277 goto out;
1278
1279 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1280 sp->nlmsg_seq,
1281 XFRM_MSG_NEWPOLICY, sizeof(*p));
1282 p = NLMSG_DATA(nlh);
1283 nlh->nlmsg_flags = sp->nlmsg_flags;
1284
1285 copy_to_user_policy(xp, p, dir);
1286 if (copy_to_user_tmpl(xp, skb) < 0)
1287 goto nlmsg_failure;
1288 if (copy_to_user_sec_ctx(xp, skb))
1289 goto nlmsg_failure;
1290 if (copy_to_user_policy_type(xp->type, skb) < 0)
1291 goto nlmsg_failure;
1292
1293 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1294 out:
1295 sp->this_idx++;
1296 return 0;
1297
1298 nlmsg_failure:
1299 nlmsg_trim(skb, b);
1300 return -1;
1301 }
1302
1303 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1304 {
1305 struct xfrm_dump_info info;
1306
1307 info.in_skb = cb->skb;
1308 info.out_skb = skb;
1309 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1310 info.nlmsg_flags = NLM_F_MULTI;
1311 info.this_idx = 0;
1312 info.start_idx = cb->args[0];
1313 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1314 #ifdef CONFIG_XFRM_SUB_POLICY
1315 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1316 #endif
1317 cb->args[0] = info.this_idx;
1318
1319 return skb->len;
1320 }
1321
1322 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1323 struct xfrm_policy *xp,
1324 int dir, u32 seq)
1325 {
1326 struct xfrm_dump_info info;
1327 struct sk_buff *skb;
1328
1329 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1330 if (!skb)
1331 return ERR_PTR(-ENOMEM);
1332
1333 info.in_skb = in_skb;
1334 info.out_skb = skb;
1335 info.nlmsg_seq = seq;
1336 info.nlmsg_flags = 0;
1337 info.this_idx = info.start_idx = 0;
1338
1339 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1340 kfree_skb(skb);
1341 return NULL;
1342 }
1343
1344 return skb;
1345 }
1346
1347 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1348 struct rtattr **xfrma)
1349 {
1350 struct xfrm_policy *xp;
1351 struct xfrm_userpolicy_id *p;
1352 u8 type = XFRM_POLICY_TYPE_MAIN;
1353 int err;
1354 struct km_event c;
1355 int delete;
1356
1357 p = NLMSG_DATA(nlh);
1358 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1359
1360 err = copy_from_user_policy_type(&type, xfrma);
1361 if (err)
1362 return err;
1363
1364 err = verify_policy_dir(p->dir);
1365 if (err)
1366 return err;
1367
1368 if (p->index)
1369 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1370 else {
1371 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1372 struct xfrm_policy tmp;
1373
1374 err = verify_sec_ctx_len(xfrma);
1375 if (err)
1376 return err;
1377
1378 memset(&tmp, 0, sizeof(struct xfrm_policy));
1379 if (rt) {
1380 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1381
1382 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1383 return err;
1384 }
1385 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1386 delete, &err);
1387 security_xfrm_policy_free(&tmp);
1388 }
1389 if (xp == NULL)
1390 return -ENOENT;
1391
1392 if (!delete) {
1393 struct sk_buff *resp_skb;
1394
1395 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1396 if (IS_ERR(resp_skb)) {
1397 err = PTR_ERR(resp_skb);
1398 } else {
1399 err = netlink_unicast(xfrm_nl, resp_skb,
1400 NETLINK_CB(skb).pid,
1401 MSG_DONTWAIT);
1402 }
1403 } else {
1404 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1405 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1406
1407 if (err != 0)
1408 goto out;
1409
1410 c.data.byid = p->index;
1411 c.event = nlh->nlmsg_type;
1412 c.seq = nlh->nlmsg_seq;
1413 c.pid = nlh->nlmsg_pid;
1414 km_policy_notify(xp, p->dir, &c);
1415 }
1416
1417 out:
1418 xfrm_pol_put(xp);
1419 return err;
1420 }
1421
1422 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1423 struct rtattr **xfrma)
1424 {
1425 struct km_event c;
1426 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1427 struct xfrm_audit audit_info;
1428 int err;
1429
1430 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1431 audit_info.secid = NETLINK_CB(skb).sid;
1432 err = xfrm_state_flush(p->proto, &audit_info);
1433 if (err)
1434 return err;
1435 c.data.proto = p->proto;
1436 c.event = nlh->nlmsg_type;
1437 c.seq = nlh->nlmsg_seq;
1438 c.pid = nlh->nlmsg_pid;
1439 km_state_notify(NULL, &c);
1440
1441 return 0;
1442 }
1443
1444
1445 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1446 {
1447 struct xfrm_aevent_id *id;
1448 struct nlmsghdr *nlh;
1449 struct xfrm_lifetime_cur ltime;
1450 unsigned char *b = skb_tail_pointer(skb);
1451
1452 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1453 id = NLMSG_DATA(nlh);
1454 nlh->nlmsg_flags = 0;
1455
1456 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1457 id->sa_id.spi = x->id.spi;
1458 id->sa_id.family = x->props.family;
1459 id->sa_id.proto = x->id.proto;
1460 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1461 id->reqid = x->props.reqid;
1462 id->flags = c->data.aevent;
1463
1464 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1465
1466 ltime.bytes = x->curlft.bytes;
1467 ltime.packets = x->curlft.packets;
1468 ltime.add_time = x->curlft.add_time;
1469 ltime.use_time = x->curlft.use_time;
1470
1471 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1472
1473 if (id->flags&XFRM_AE_RTHR) {
1474 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1475 }
1476
1477 if (id->flags&XFRM_AE_ETHR) {
1478 u32 etimer = x->replay_maxage*10/HZ;
1479 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1480 }
1481
1482 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1483 return skb->len;
1484
1485 rtattr_failure:
1486 nlmsg_failure:
1487 nlmsg_trim(skb, b);
1488 return -1;
1489 }
1490
1491 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1492 struct rtattr **xfrma)
1493 {
1494 struct xfrm_state *x;
1495 struct sk_buff *r_skb;
1496 int err;
1497 struct km_event c;
1498 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1499 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1500 struct xfrm_usersa_id *id = &p->sa_id;
1501
1502 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1503 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1504
1505 if (p->flags&XFRM_AE_RTHR)
1506 len+=RTA_SPACE(sizeof(u32));
1507
1508 if (p->flags&XFRM_AE_ETHR)
1509 len+=RTA_SPACE(sizeof(u32));
1510
1511 r_skb = alloc_skb(len, GFP_ATOMIC);
1512 if (r_skb == NULL)
1513 return -ENOMEM;
1514
1515 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1516 if (x == NULL) {
1517 kfree_skb(r_skb);
1518 return -ESRCH;
1519 }
1520
1521 /*
1522 * XXX: is this lock really needed - none of the other
1523 * gets lock (the concern is things getting updated
1524 * while we are still reading) - jhs
1525 */
1526 spin_lock_bh(&x->lock);
1527 c.data.aevent = p->flags;
1528 c.seq = nlh->nlmsg_seq;
1529 c.pid = nlh->nlmsg_pid;
1530
1531 if (build_aevent(r_skb, x, &c) < 0)
1532 BUG();
1533 err = netlink_unicast(xfrm_nl, r_skb,
1534 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1535 spin_unlock_bh(&x->lock);
1536 xfrm_state_put(x);
1537 return err;
1538 }
1539
1540 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1541 struct rtattr **xfrma)
1542 {
1543 struct xfrm_state *x;
1544 struct km_event c;
1545 int err = - EINVAL;
1546 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1547 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1548 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1549
1550 if (!lt && !rp)
1551 return err;
1552
1553 /* pedantic mode - thou shalt sayeth replaceth */
1554 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1555 return err;
1556
1557 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1558 if (x == NULL)
1559 return -ESRCH;
1560
1561 if (x->km.state != XFRM_STATE_VALID)
1562 goto out;
1563
1564 spin_lock_bh(&x->lock);
1565 err = xfrm_update_ae_params(x, xfrma);
1566 spin_unlock_bh(&x->lock);
1567 if (err < 0)
1568 goto out;
1569
1570 c.event = nlh->nlmsg_type;
1571 c.seq = nlh->nlmsg_seq;
1572 c.pid = nlh->nlmsg_pid;
1573 c.data.aevent = XFRM_AE_CU;
1574 km_state_notify(x, &c);
1575 err = 0;
1576 out:
1577 xfrm_state_put(x);
1578 return err;
1579 }
1580
1581 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1582 struct rtattr **xfrma)
1583 {
1584 struct km_event c;
1585 u8 type = XFRM_POLICY_TYPE_MAIN;
1586 int err;
1587 struct xfrm_audit audit_info;
1588
1589 err = copy_from_user_policy_type(&type, xfrma);
1590 if (err)
1591 return err;
1592
1593 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1594 audit_info.secid = NETLINK_CB(skb).sid;
1595 err = xfrm_policy_flush(type, &audit_info);
1596 if (err)
1597 return err;
1598 c.data.type = type;
1599 c.event = nlh->nlmsg_type;
1600 c.seq = nlh->nlmsg_seq;
1601 c.pid = nlh->nlmsg_pid;
1602 km_policy_notify(NULL, 0, &c);
1603 return 0;
1604 }
1605
1606 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1607 struct rtattr **xfrma)
1608 {
1609 struct xfrm_policy *xp;
1610 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1611 struct xfrm_userpolicy_info *p = &up->pol;
1612 u8 type = XFRM_POLICY_TYPE_MAIN;
1613 int err = -ENOENT;
1614
1615 err = copy_from_user_policy_type(&type, xfrma);
1616 if (err)
1617 return err;
1618
1619 if (p->index)
1620 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1621 else {
1622 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1623 struct xfrm_policy tmp;
1624
1625 err = verify_sec_ctx_len(xfrma);
1626 if (err)
1627 return err;
1628
1629 memset(&tmp, 0, sizeof(struct xfrm_policy));
1630 if (rt) {
1631 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1632
1633 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1634 return err;
1635 }
1636 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1637 0, &err);
1638 security_xfrm_policy_free(&tmp);
1639 }
1640
1641 if (xp == NULL)
1642 return -ENOENT;
1643 read_lock(&xp->lock);
1644 if (xp->dead) {
1645 read_unlock(&xp->lock);
1646 goto out;
1647 }
1648
1649 read_unlock(&xp->lock);
1650 err = 0;
1651 if (up->hard) {
1652 xfrm_policy_delete(xp, p->dir);
1653 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1654 AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);
1655
1656 } else {
1657 // reset the timers here?
1658 printk("Dont know what to do with soft policy expire\n");
1659 }
1660 km_policy_expired(xp, p->dir, up->hard, current->pid);
1661
1662 out:
1663 xfrm_pol_put(xp);
1664 return err;
1665 }
1666
1667 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1668 struct rtattr **xfrma)
1669 {
1670 struct xfrm_state *x;
1671 int err;
1672 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1673 struct xfrm_usersa_info *p = &ue->state;
1674
1675 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1676
1677 err = -ENOENT;
1678 if (x == NULL)
1679 return err;
1680
1681 spin_lock_bh(&x->lock);
1682 err = -EINVAL;
1683 if (x->km.state != XFRM_STATE_VALID)
1684 goto out;
1685 km_state_expired(x, ue->hard, current->pid);
1686
1687 if (ue->hard) {
1688 __xfrm_state_delete(x);
1689 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1690 AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
1691 }
1692 err = 0;
1693 out:
1694 spin_unlock_bh(&x->lock);
1695 xfrm_state_put(x);
1696 return err;
1697 }
1698
1699 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1700 struct rtattr **xfrma)
1701 {
1702 struct xfrm_policy *xp;
1703 struct xfrm_user_tmpl *ut;
1704 int i;
1705 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1706
1707 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1708 struct xfrm_state *x = xfrm_state_alloc();
1709 int err = -ENOMEM;
1710
1711 if (!x)
1712 return err;
1713
1714 err = verify_newpolicy_info(&ua->policy);
1715 if (err) {
1716 printk("BAD policy passed\n");
1717 kfree(x);
1718 return err;
1719 }
1720
1721 /* build an XP */
1722 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);
1723 if (!xp) {
1724 kfree(x);
1725 return err;
1726 }
1727
1728 memcpy(&x->id, &ua->id, sizeof(ua->id));
1729 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1730 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1731
1732 ut = RTA_DATA(rt);
1733 /* extract the templates and for each call km_key */
1734 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1735 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1736 memcpy(&x->id, &t->id, sizeof(x->id));
1737 x->props.mode = t->mode;
1738 x->props.reqid = t->reqid;
1739 x->props.family = ut->family;
1740 t->aalgos = ua->aalgos;
1741 t->ealgos = ua->ealgos;
1742 t->calgos = ua->calgos;
1743 err = km_query(x, t, xp);
1744
1745 }
1746
1747 kfree(x);
1748 kfree(xp);
1749
1750 return 0;
1751 }
1752
1753 #ifdef CONFIG_XFRM_MIGRATE
1754 static int verify_user_migrate(struct rtattr **xfrma)
1755 {
1756 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1757 struct xfrm_user_migrate *um;
1758
1759 if (!rt)
1760 return -EINVAL;
1761
1762 if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
1763 return -EINVAL;
1764
1765 return 0;
1766 }
1767
1768 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1769 struct rtattr **xfrma, int *num)
1770 {
1771 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1772 struct xfrm_user_migrate *um;
1773 int i, num_migrate;
1774
1775 um = RTA_DATA(rt);
1776 num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um);
1777
1778 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1779 return -EINVAL;
1780
1781 for (i = 0; i < num_migrate; i++, um++, ma++) {
1782 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1783 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1784 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1785 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1786
1787 ma->proto = um->proto;
1788 ma->mode = um->mode;
1789 ma->reqid = um->reqid;
1790
1791 ma->old_family = um->old_family;
1792 ma->new_family = um->new_family;
1793 }
1794
1795 *num = i;
1796 return 0;
1797 }
1798
1799 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1800 struct rtattr **xfrma)
1801 {
1802 struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh);
1803 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1804 u8 type;
1805 int err;
1806 int n = 0;
1807
1808 err = verify_user_migrate((struct rtattr **)xfrma);
1809 if (err)
1810 return err;
1811
1812 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1813 if (err)
1814 return err;
1815
1816 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1817 (struct rtattr **)xfrma, &n);
1818 if (err)
1819 return err;
1820
1821 if (!n)
1822 return 0;
1823
1824 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1825
1826 return 0;
1827 }
1828 #else
1829 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1830 struct rtattr **xfrma)
1831 {
1832 return -ENOPROTOOPT;
1833 }
1834 #endif
1835
1836 #ifdef CONFIG_XFRM_MIGRATE
1837 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1838 {
1839 struct xfrm_user_migrate um;
1840
1841 memset(&um, 0, sizeof(um));
1842 um.proto = m->proto;
1843 um.mode = m->mode;
1844 um.reqid = m->reqid;
1845 um.old_family = m->old_family;
1846 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1847 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1848 um.new_family = m->new_family;
1849 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1850 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1851
1852 RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
1853 return 0;
1854
1855 rtattr_failure:
1856 return -1;
1857 }
1858
1859 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1860 int num_migrate, struct xfrm_selector *sel,
1861 u8 dir, u8 type)
1862 {
1863 struct xfrm_migrate *mp;
1864 struct xfrm_userpolicy_id *pol_id;
1865 struct nlmsghdr *nlh;
1866 unsigned char *b = skb_tail_pointer(skb);
1867 int i;
1868
1869 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
1870 pol_id = NLMSG_DATA(nlh);
1871 nlh->nlmsg_flags = 0;
1872
1873 /* copy data from selector, dir, and type to the pol_id */
1874 memset(pol_id, 0, sizeof(*pol_id));
1875 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1876 pol_id->dir = dir;
1877
1878 if (copy_to_user_policy_type(type, skb) < 0)
1879 goto nlmsg_failure;
1880
1881 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1882 if (copy_to_user_migrate(mp, skb) < 0)
1883 goto nlmsg_failure;
1884 }
1885
1886 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1887 return skb->len;
1888 nlmsg_failure:
1889 nlmsg_trim(skb, b);
1890 return -1;
1891 }
1892
1893 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1894 struct xfrm_migrate *m, int num_migrate)
1895 {
1896 struct sk_buff *skb;
1897 size_t len;
1898
1899 len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
1900 len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
1901 #ifdef CONFIG_XFRM_SUB_POLICY
1902 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
1903 #endif
1904 skb = alloc_skb(len, GFP_ATOMIC);
1905 if (skb == NULL)
1906 return -ENOMEM;
1907
1908 /* build migrate */
1909 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1910 BUG();
1911
1912 NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
1913 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE,
1914 GFP_ATOMIC);
1915 }
1916 #else
1917 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1918 struct xfrm_migrate *m, int num_migrate)
1919 {
1920 return -ENOPROTOOPT;
1921 }
1922 #endif
1923
1924 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1925
1926 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1927 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1928 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1929 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1930 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1931 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1932 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1933 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1934 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1935 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1936 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1937 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1938 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1939 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1940 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1941 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1942 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1943 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1944 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1945 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
1946 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
1947 };
1948
1949 #undef XMSGSIZE
1950
1951 static struct xfrm_link {
1952 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
1953 int (*dump)(struct sk_buff *, struct netlink_callback *);
1954 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1955 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1956 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1957 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1958 .dump = xfrm_dump_sa },
1959 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1960 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1961 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1962 .dump = xfrm_dump_policy },
1963 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1964 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1965 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1966 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1967 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1968 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1969 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1970 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1971 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1972 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1973 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1974 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1975 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1976 };
1977
1978 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1979 {
1980 struct rtattr *xfrma[XFRMA_MAX];
1981 struct xfrm_link *link;
1982 int type, min_len;
1983
1984 type = nlh->nlmsg_type;
1985 if (type > XFRM_MSG_MAX)
1986 return -EINVAL;
1987
1988 type -= XFRM_MSG_BASE;
1989 link = &xfrm_dispatch[type];
1990
1991 /* All operations require privileges, even GET */
1992 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1993 return -EPERM;
1994
1995 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1996 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1997 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1998 if (link->dump == NULL)
1999 return -EINVAL;
2000
2001 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
2002 }
2003
2004 memset(xfrma, 0, sizeof(xfrma));
2005
2006 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
2007 return -EINVAL;
2008
2009 if (nlh->nlmsg_len > min_len) {
2010 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
2011 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
2012
2013 while (RTA_OK(attr, attrlen)) {
2014 unsigned short flavor = attr->rta_type;
2015 if (flavor) {
2016 if (flavor > XFRMA_MAX)
2017 return -EINVAL;
2018 xfrma[flavor - 1] = attr;
2019 }
2020 attr = RTA_NEXT(attr, attrlen);
2021 }
2022 }
2023
2024 if (link->doit == NULL)
2025 return -EINVAL;
2026
2027 return link->doit(skb, nlh, xfrma);
2028 }
2029
2030 static void xfrm_netlink_rcv(struct sock *sk, int len)
2031 {
2032 unsigned int qlen = 0;
2033
2034 do {
2035 mutex_lock(&xfrm_cfg_mutex);
2036 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
2037 mutex_unlock(&xfrm_cfg_mutex);
2038
2039 } while (qlen);
2040 }
2041
2042 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
2043 {
2044 struct xfrm_user_expire *ue;
2045 struct nlmsghdr *nlh;
2046 unsigned char *b = skb_tail_pointer(skb);
2047
2048 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
2049 sizeof(*ue));
2050 ue = NLMSG_DATA(nlh);
2051 nlh->nlmsg_flags = 0;
2052
2053 copy_to_user_state(x, &ue->state);
2054 ue->hard = (c->data.hard != 0) ? 1 : 0;
2055
2056 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2057 return skb->len;
2058
2059 nlmsg_failure:
2060 nlmsg_trim(skb, b);
2061 return -1;
2062 }
2063
2064 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
2065 {
2066 struct sk_buff *skb;
2067 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
2068
2069 skb = alloc_skb(len, GFP_ATOMIC);
2070 if (skb == NULL)
2071 return -ENOMEM;
2072
2073 if (build_expire(skb, x, c) < 0)
2074 BUG();
2075
2076 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2077 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2078 }
2079
2080 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2081 {
2082 struct sk_buff *skb;
2083 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
2084
2085 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
2086 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
2087 skb = alloc_skb(len, GFP_ATOMIC);
2088 if (skb == NULL)
2089 return -ENOMEM;
2090
2091 if (build_aevent(skb, x, c) < 0)
2092 BUG();
2093
2094 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
2095 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2096 }
2097
2098 static int xfrm_notify_sa_flush(struct km_event *c)
2099 {
2100 struct xfrm_usersa_flush *p;
2101 struct nlmsghdr *nlh;
2102 struct sk_buff *skb;
2103 sk_buff_data_t b;
2104 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
2105
2106 skb = alloc_skb(len, GFP_ATOMIC);
2107 if (skb == NULL)
2108 return -ENOMEM;
2109 b = skb->tail;
2110
2111 nlh = NLMSG_PUT(skb, c->pid, c->seq,
2112 XFRM_MSG_FLUSHSA, sizeof(*p));
2113 nlh->nlmsg_flags = 0;
2114
2115 p = NLMSG_DATA(nlh);
2116 p->proto = c->data.proto;
2117
2118 nlh->nlmsg_len = skb->tail - b;
2119
2120 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2121 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2122
2123 nlmsg_failure:
2124 kfree_skb(skb);
2125 return -1;
2126 }
2127
2128 static inline int xfrm_sa_len(struct xfrm_state *x)
2129 {
2130 int l = 0;
2131 if (x->aalg)
2132 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
2133 if (x->ealg)
2134 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
2135 if (x->calg)
2136 l += RTA_SPACE(sizeof(*x->calg));
2137 if (x->encap)
2138 l += RTA_SPACE(sizeof(*x->encap));
2139
2140 return l;
2141 }
2142
2143 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2144 {
2145 struct xfrm_usersa_info *p;
2146 struct xfrm_usersa_id *id;
2147 struct nlmsghdr *nlh;
2148 struct sk_buff *skb;
2149 sk_buff_data_t b;
2150 int len = xfrm_sa_len(x);
2151 int headlen;
2152
2153 headlen = sizeof(*p);
2154 if (c->event == XFRM_MSG_DELSA) {
2155 len += RTA_SPACE(headlen);
2156 headlen = sizeof(*id);
2157 }
2158 len += NLMSG_SPACE(headlen);
2159
2160 skb = alloc_skb(len, GFP_ATOMIC);
2161 if (skb == NULL)
2162 return -ENOMEM;
2163 b = skb->tail;
2164
2165 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2166 nlh->nlmsg_flags = 0;
2167
2168 p = NLMSG_DATA(nlh);
2169 if (c->event == XFRM_MSG_DELSA) {
2170 id = NLMSG_DATA(nlh);
2171 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2172 id->spi = x->id.spi;
2173 id->family = x->props.family;
2174 id->proto = x->id.proto;
2175
2176 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
2177 }
2178
2179 copy_to_user_state(x, p);
2180
2181 if (x->aalg)
2182 RTA_PUT(skb, XFRMA_ALG_AUTH,
2183 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
2184 if (x->ealg)
2185 RTA_PUT(skb, XFRMA_ALG_CRYPT,
2186 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
2187 if (x->calg)
2188 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
2189
2190 if (x->encap)
2191 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
2192
2193 nlh->nlmsg_len = skb->tail - b;
2194
2195 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2196 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2197
2198 nlmsg_failure:
2199 rtattr_failure:
2200 kfree_skb(skb);
2201 return -1;
2202 }
2203
2204 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2205 {
2206
2207 switch (c->event) {
2208 case XFRM_MSG_EXPIRE:
2209 return xfrm_exp_state_notify(x, c);
2210 case XFRM_MSG_NEWAE:
2211 return xfrm_aevent_state_notify(x, c);
2212 case XFRM_MSG_DELSA:
2213 case XFRM_MSG_UPDSA:
2214 case XFRM_MSG_NEWSA:
2215 return xfrm_notify_sa(x, c);
2216 case XFRM_MSG_FLUSHSA:
2217 return xfrm_notify_sa_flush(c);
2218 default:
2219 printk("xfrm_user: Unknown SA event %d\n", c->event);
2220 break;
2221 }
2222
2223 return 0;
2224
2225 }
2226
2227 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2228 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2229 int dir)
2230 {
2231 struct xfrm_user_acquire *ua;
2232 struct nlmsghdr *nlh;
2233 unsigned char *b = skb_tail_pointer(skb);
2234 __u32 seq = xfrm_get_acqseq();
2235
2236 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
2237 sizeof(*ua));
2238 ua = NLMSG_DATA(nlh);
2239 nlh->nlmsg_flags = 0;
2240
2241 memcpy(&ua->id, &x->id, sizeof(ua->id));
2242 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2243 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2244 copy_to_user_policy(xp, &ua->policy, dir);
2245 ua->aalgos = xt->aalgos;
2246 ua->ealgos = xt->ealgos;
2247 ua->calgos = xt->calgos;
2248 ua->seq = x->km.seq = seq;
2249
2250 if (copy_to_user_tmpl(xp, skb) < 0)
2251 goto nlmsg_failure;
2252 if (copy_to_user_state_sec_ctx(x, skb))
2253 goto nlmsg_failure;
2254 if (copy_to_user_policy_type(xp->type, skb) < 0)
2255 goto nlmsg_failure;
2256
2257 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2258 return skb->len;
2259
2260 nlmsg_failure:
2261 nlmsg_trim(skb, b);
2262 return -1;
2263 }
2264
2265 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2266 struct xfrm_policy *xp, int dir)
2267 {
2268 struct sk_buff *skb;
2269 size_t len;
2270
2271 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2272 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
2273 len += RTA_SPACE(xfrm_user_sec_ctx_size(x->security));
2274 #ifdef CONFIG_XFRM_SUB_POLICY
2275 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2276 #endif
2277 skb = alloc_skb(len, GFP_ATOMIC);
2278 if (skb == NULL)
2279 return -ENOMEM;
2280
2281 if (build_acquire(skb, x, xt, xp, dir) < 0)
2282 BUG();
2283
2284 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
2285 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2286 }
2287
2288 /* User gives us xfrm_user_policy_info followed by an array of 0
2289 * or more templates.
2290 */
2291 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2292 u8 *data, int len, int *dir)
2293 {
2294 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2295 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2296 struct xfrm_policy *xp;
2297 int nr;
2298
2299 switch (sk->sk_family) {
2300 case AF_INET:
2301 if (opt != IP_XFRM_POLICY) {
2302 *dir = -EOPNOTSUPP;
2303 return NULL;
2304 }
2305 break;
2306 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2307 case AF_INET6:
2308 if (opt != IPV6_XFRM_POLICY) {
2309 *dir = -EOPNOTSUPP;
2310 return NULL;
2311 }
2312 break;
2313 #endif
2314 default:
2315 *dir = -EINVAL;
2316 return NULL;
2317 }
2318
2319 *dir = -EINVAL;
2320
2321 if (len < sizeof(*p) ||
2322 verify_newpolicy_info(p))
2323 return NULL;
2324
2325 nr = ((len - sizeof(*p)) / sizeof(*ut));
2326 if (validate_tmpl(nr, ut, p->sel.family))
2327 return NULL;
2328
2329 if (p->dir > XFRM_POLICY_OUT)
2330 return NULL;
2331
2332 xp = xfrm_policy_alloc(GFP_KERNEL);
2333 if (xp == NULL) {
2334 *dir = -ENOBUFS;
2335 return NULL;
2336 }
2337
2338 copy_from_user_policy(xp, p);
2339 xp->type = XFRM_POLICY_TYPE_MAIN;
2340 copy_templates(xp, ut, nr);
2341
2342 *dir = p->dir;
2343
2344 return xp;
2345 }
2346
2347 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2348 int dir, struct km_event *c)
2349 {
2350 struct xfrm_user_polexpire *upe;
2351 struct nlmsghdr *nlh;
2352 int hard = c->data.hard;
2353 unsigned char *b = skb_tail_pointer(skb);
2354
2355 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
2356 upe = NLMSG_DATA(nlh);
2357 nlh->nlmsg_flags = 0;
2358
2359 copy_to_user_policy(xp, &upe->pol, dir);
2360 if (copy_to_user_tmpl(xp, skb) < 0)
2361 goto nlmsg_failure;
2362 if (copy_to_user_sec_ctx(xp, skb))
2363 goto nlmsg_failure;
2364 if (copy_to_user_policy_type(xp->type, skb) < 0)
2365 goto nlmsg_failure;
2366 upe->hard = !!hard;
2367
2368 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2369 return skb->len;
2370
2371 nlmsg_failure:
2372 nlmsg_trim(skb, b);
2373 return -1;
2374 }
2375
2376 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2377 {
2378 struct sk_buff *skb;
2379 size_t len;
2380
2381 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2382 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2383 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp->security));
2384 #ifdef CONFIG_XFRM_SUB_POLICY
2385 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2386 #endif
2387 skb = alloc_skb(len, GFP_ATOMIC);
2388 if (skb == NULL)
2389 return -ENOMEM;
2390
2391 if (build_polexpire(skb, xp, dir, c) < 0)
2392 BUG();
2393
2394 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2395 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2396 }
2397
2398 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2399 {
2400 struct xfrm_userpolicy_info *p;
2401 struct xfrm_userpolicy_id *id;
2402 struct nlmsghdr *nlh;
2403 struct sk_buff *skb;
2404 sk_buff_data_t b;
2405 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2406 int headlen;
2407
2408 headlen = sizeof(*p);
2409 if (c->event == XFRM_MSG_DELPOLICY) {
2410 len += RTA_SPACE(headlen);
2411 headlen = sizeof(*id);
2412 }
2413 #ifdef CONFIG_XFRM_SUB_POLICY
2414 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2415 #endif
2416 len += NLMSG_SPACE(headlen);
2417
2418 skb = alloc_skb(len, GFP_ATOMIC);
2419 if (skb == NULL)
2420 return -ENOMEM;
2421 b = skb->tail;
2422
2423 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2424
2425 p = NLMSG_DATA(nlh);
2426 if (c->event == XFRM_MSG_DELPOLICY) {
2427 id = NLMSG_DATA(nlh);
2428 memset(id, 0, sizeof(*id));
2429 id->dir = dir;
2430 if (c->data.byid)
2431 id->index = xp->index;
2432 else
2433 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2434
2435 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2436 }
2437
2438 nlh->nlmsg_flags = 0;
2439
2440 copy_to_user_policy(xp, p, dir);
2441 if (copy_to_user_tmpl(xp, skb) < 0)
2442 goto nlmsg_failure;
2443 if (copy_to_user_policy_type(xp->type, skb) < 0)
2444 goto nlmsg_failure;
2445
2446 nlh->nlmsg_len = skb->tail - b;
2447
2448 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2449 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2450
2451 nlmsg_failure:
2452 rtattr_failure:
2453 kfree_skb(skb);
2454 return -1;
2455 }
2456
2457 static int xfrm_notify_policy_flush(struct km_event *c)
2458 {
2459 struct nlmsghdr *nlh;
2460 struct sk_buff *skb;
2461 sk_buff_data_t b;
2462 int len = 0;
2463 #ifdef CONFIG_XFRM_SUB_POLICY
2464 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2465 #endif
2466 len += NLMSG_LENGTH(0);
2467
2468 skb = alloc_skb(len, GFP_ATOMIC);
2469 if (skb == NULL)
2470 return -ENOMEM;
2471 b = skb->tail;
2472
2473
2474 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2475 nlh->nlmsg_flags = 0;
2476 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2477 goto nlmsg_failure;
2478
2479 nlh->nlmsg_len = skb->tail - b;
2480
2481 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2482 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2483
2484 nlmsg_failure:
2485 kfree_skb(skb);
2486 return -1;
2487 }
2488
2489 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2490 {
2491
2492 switch (c->event) {
2493 case XFRM_MSG_NEWPOLICY:
2494 case XFRM_MSG_UPDPOLICY:
2495 case XFRM_MSG_DELPOLICY:
2496 return xfrm_notify_policy(xp, dir, c);
2497 case XFRM_MSG_FLUSHPOLICY:
2498 return xfrm_notify_policy_flush(c);
2499 case XFRM_MSG_POLEXPIRE:
2500 return xfrm_exp_policy_notify(xp, dir, c);
2501 default:
2502 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2503 }
2504
2505 return 0;
2506
2507 }
2508
2509 static int build_report(struct sk_buff *skb, u8 proto,
2510 struct xfrm_selector *sel, xfrm_address_t *addr)
2511 {
2512 struct xfrm_user_report *ur;
2513 struct nlmsghdr *nlh;
2514 unsigned char *b = skb_tail_pointer(skb);
2515
2516 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2517 ur = NLMSG_DATA(nlh);
2518 nlh->nlmsg_flags = 0;
2519
2520 ur->proto = proto;
2521 memcpy(&ur->sel, sel, sizeof(ur->sel));
2522
2523 if (addr)
2524 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2525
2526 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2527 return skb->len;
2528
2529 nlmsg_failure:
2530 rtattr_failure:
2531 nlmsg_trim(skb, b);
2532 return -1;
2533 }
2534
2535 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2536 xfrm_address_t *addr)
2537 {
2538 struct sk_buff *skb;
2539 size_t len;
2540
2541 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2542 skb = alloc_skb(len, GFP_ATOMIC);
2543 if (skb == NULL)
2544 return -ENOMEM;
2545
2546 if (build_report(skb, proto, sel, addr) < 0)
2547 BUG();
2548
2549 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2550 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2551 }
2552
2553 static struct xfrm_mgr netlink_mgr = {
2554 .id = "netlink",
2555 .notify = xfrm_send_state_notify,
2556 .acquire = xfrm_send_acquire,
2557 .compile_policy = xfrm_compile_policy,
2558 .notify_policy = xfrm_send_policy_notify,
2559 .report = xfrm_send_report,
2560 .migrate = xfrm_send_migrate,
2561 };
2562
2563 static int __init xfrm_user_init(void)
2564 {
2565 struct sock *nlsk;
2566
2567 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2568
2569 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2570 xfrm_netlink_rcv, NULL, THIS_MODULE);
2571 if (nlsk == NULL)
2572 return -ENOMEM;
2573 rcu_assign_pointer(xfrm_nl, nlsk);
2574
2575 xfrm_register_km(&netlink_mgr);
2576
2577 return 0;
2578 }
2579
2580 static void __exit xfrm_user_exit(void)
2581 {
2582 struct sock *nlsk = xfrm_nl;
2583
2584 xfrm_unregister_km(&netlink_mgr);
2585 rcu_assign_pointer(xfrm_nl, NULL);
2586 synchronize_rcu();
2587 sock_release(nlsk->sk_socket);
2588 }
2589
2590 module_init(xfrm_user_init);
2591 module_exit(xfrm_user_exit);
2592 MODULE_LICENSE("GPL");
2593 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2594
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