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[XFRM] STATE: Search by address using source address list.
[linux-2.6/openmoko-kernel/knife-kernel.git] / net / xfrm / xfrm_user.c
blobb5f8ab71aa549136d3bede51e21a119e49e40c53
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
32 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
33 {
34 struct rtattr *rt = xfrma[type - 1];
35 struct xfrm_algo *algp;
36 int len;
37
38 if (!rt)
39 return 0;
40
41 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
42 if (len < 0)
43 return -EINVAL;
44
45 algp = RTA_DATA(rt);
46
47 len -= (algp->alg_key_len + 7U) / 8;
48 if (len < 0)
49 return -EINVAL;
50
51 switch (type) {
52 case XFRMA_ALG_AUTH:
53 if (!algp->alg_key_len &&
54 strcmp(algp->alg_name, "digest_null") != 0)
55 return -EINVAL;
56 break;
57
58 case XFRMA_ALG_CRYPT:
59 if (!algp->alg_key_len &&
60 strcmp(algp->alg_name, "cipher_null") != 0)
61 return -EINVAL;
62 break;
63
64 case XFRMA_ALG_COMP:
65 /* Zero length keys are legal. */
66 break;
67
68 default:
69 return -EINVAL;
70 };
71
72 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
73 return 0;
74 }
75
76 static int verify_encap_tmpl(struct rtattr **xfrma)
77 {
78 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
79 struct xfrm_encap_tmpl *encap;
80
81 if (!rt)
82 return 0;
83
84 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
85 return -EINVAL;
86
87 return 0;
88 }
89
90 static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
91 xfrm_address_t **addrp)
92 {
93 struct rtattr *rt = xfrma[type - 1];
94
95 if (!rt)
96 return 0;
97
98 if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
99 return -EINVAL;
100
101 if (addrp)
102 *addrp = RTA_DATA(rt);
103
104 return 0;
105 }
106
107 static inline int verify_sec_ctx_len(struct rtattr **xfrma)
108 {
109 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
110 struct xfrm_user_sec_ctx *uctx;
111 int len = 0;
112
113 if (!rt)
114 return 0;
115
116 if (rt->rta_len < sizeof(*uctx))
117 return -EINVAL;
118
119 uctx = RTA_DATA(rt);
120
121 len += sizeof(struct xfrm_user_sec_ctx);
122 len += uctx->ctx_len;
123
124 if (uctx->len != len)
125 return -EINVAL;
126
127 return 0;
128 }
129
130
131 static int verify_newsa_info(struct xfrm_usersa_info *p,
132 struct rtattr **xfrma)
133 {
134 int err;
135
136 err = -EINVAL;
137 switch (p->family) {
138 case AF_INET:
139 break;
140
141 case AF_INET6:
142 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
143 break;
144 #else
145 err = -EAFNOSUPPORT;
146 goto out;
147 #endif
148
149 default:
150 goto out;
151 };
152
153 err = -EINVAL;
154 switch (p->id.proto) {
155 case IPPROTO_AH:
156 if (!xfrma[XFRMA_ALG_AUTH-1] ||
157 xfrma[XFRMA_ALG_CRYPT-1] ||
158 xfrma[XFRMA_ALG_COMP-1])
159 goto out;
160 break;
161
162 case IPPROTO_ESP:
163 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
164 !xfrma[XFRMA_ALG_CRYPT-1]) ||
165 xfrma[XFRMA_ALG_COMP-1])
166 goto out;
167 break;
168
169 case IPPROTO_COMP:
170 if (!xfrma[XFRMA_ALG_COMP-1] ||
171 xfrma[XFRMA_ALG_AUTH-1] ||
172 xfrma[XFRMA_ALG_CRYPT-1])
173 goto out;
174 break;
175
176 default:
177 goto out;
178 };
179
180 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
181 goto out;
182 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
183 goto out;
184 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
185 goto out;
186 if ((err = verify_encap_tmpl(xfrma)))
187 goto out;
188 if ((err = verify_sec_ctx_len(xfrma)))
189 goto out;
190
191 err = -EINVAL;
192 switch (p->mode) {
193 case XFRM_MODE_TRANSPORT:
194 case XFRM_MODE_TUNNEL:
195 break;
196
197 default:
198 goto out;
199 };
200
201 err = 0;
202
203 out:
204 return err;
205 }
206
207 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
208 struct xfrm_algo_desc *(*get_byname)(char *, int),
209 struct rtattr *u_arg)
210 {
211 struct rtattr *rta = u_arg;
212 struct xfrm_algo *p, *ualg;
213 struct xfrm_algo_desc *algo;
214 int len;
215
216 if (!rta)
217 return 0;
218
219 ualg = RTA_DATA(rta);
220
221 algo = get_byname(ualg->alg_name, 1);
222 if (!algo)
223 return -ENOSYS;
224 *props = algo->desc.sadb_alg_id;
225
226 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
227 p = kmalloc(len, GFP_KERNEL);
228 if (!p)
229 return -ENOMEM;
230
231 memcpy(p, ualg, len);
232 strcpy(p->alg_name, algo->name);
233 *algpp = p;
234 return 0;
235 }
236
237 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
238 {
239 struct rtattr *rta = u_arg;
240 struct xfrm_encap_tmpl *p, *uencap;
241
242 if (!rta)
243 return 0;
244
245 uencap = RTA_DATA(rta);
246 p = kmalloc(sizeof(*p), GFP_KERNEL);
247 if (!p)
248 return -ENOMEM;
249
250 memcpy(p, uencap, sizeof(*p));
251 *encapp = p;
252 return 0;
253 }
254
255
256 static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp)
257 {
258 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
259 int len = 0;
260
261 if (xfrm_ctx) {
262 len += sizeof(struct xfrm_user_sec_ctx);
263 len += xfrm_ctx->ctx_len;
264 }
265 return len;
266 }
267
268 static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
269 {
270 struct xfrm_user_sec_ctx *uctx;
271
272 if (!u_arg)
273 return 0;
274
275 uctx = RTA_DATA(u_arg);
276 return security_xfrm_state_alloc(x, uctx);
277 }
278
279 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
280 {
281 memcpy(&x->id, &p->id, sizeof(x->id));
282 memcpy(&x->sel, &p->sel, sizeof(x->sel));
283 memcpy(&x->lft, &p->lft, sizeof(x->lft));
284 x->props.mode = p->mode;
285 x->props.replay_window = p->replay_window;
286 x->props.reqid = p->reqid;
287 x->props.family = p->family;
288 x->props.saddr = p->saddr;
289 x->props.flags = p->flags;
290 }
291
292 /*
293 * someday when pfkey also has support, we could have the code
294 * somehow made shareable and move it to xfrm_state.c - JHS
295 *
296 */
297 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
298 {
299 int err = - EINVAL;
300 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
301 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
302 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
303 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
304
305 if (rp) {
306 struct xfrm_replay_state *replay;
307 if (RTA_PAYLOAD(rp) < sizeof(*replay))
308 goto error;
309 replay = RTA_DATA(rp);
310 memcpy(&x->replay, replay, sizeof(*replay));
311 memcpy(&x->preplay, replay, sizeof(*replay));
312 }
313
314 if (lt) {
315 struct xfrm_lifetime_cur *ltime;
316 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
317 goto error;
318 ltime = RTA_DATA(lt);
319 x->curlft.bytes = ltime->bytes;
320 x->curlft.packets = ltime->packets;
321 x->curlft.add_time = ltime->add_time;
322 x->curlft.use_time = ltime->use_time;
323 }
324
325 if (et) {
326 if (RTA_PAYLOAD(et) < sizeof(u32))
327 goto error;
328 x->replay_maxage = *(u32*)RTA_DATA(et);
329 }
330
331 if (rt) {
332 if (RTA_PAYLOAD(rt) < sizeof(u32))
333 goto error;
334 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
335 }
336
337 return 0;
338 error:
339 return err;
340 }
341
342 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
343 struct rtattr **xfrma,
344 int *errp)
345 {
346 struct xfrm_state *x = xfrm_state_alloc();
347 int err = -ENOMEM;
348
349 if (!x)
350 goto error_no_put;
351
352 copy_from_user_state(x, p);
353
354 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
355 xfrm_aalg_get_byname,
356 xfrma[XFRMA_ALG_AUTH-1])))
357 goto error;
358 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
359 xfrm_ealg_get_byname,
360 xfrma[XFRMA_ALG_CRYPT-1])))
361 goto error;
362 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
363 xfrm_calg_get_byname,
364 xfrma[XFRMA_ALG_COMP-1])))
365 goto error;
366 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
367 goto error;
368
369 err = xfrm_init_state(x);
370 if (err)
371 goto error;
372
373 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
374 goto error;
375
376 x->km.seq = p->seq;
377 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
378 /* sysctl_xfrm_aevent_etime is in 100ms units */
379 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
380 x->preplay.bitmap = 0;
381 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
382 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
383
384 /* override default values from above */
385
386 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
387 if (err < 0)
388 goto error;
389
390 return x;
391
392 error:
393 x->km.state = XFRM_STATE_DEAD;
394 xfrm_state_put(x);
395 error_no_put:
396 *errp = err;
397 return NULL;
398 }
399
400 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
401 {
402 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
403 struct xfrm_state *x;
404 int err;
405 struct km_event c;
406
407 err = verify_newsa_info(p, (struct rtattr **)xfrma);
408 if (err)
409 return err;
410
411 x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err);
412 if (!x)
413 return err;
414
415 xfrm_state_hold(x);
416 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
417 err = xfrm_state_add(x);
418 else
419 err = xfrm_state_update(x);
420
421 if (err < 0) {
422 x->km.state = XFRM_STATE_DEAD;
423 __xfrm_state_put(x);
424 goto out;
425 }
426
427 c.seq = nlh->nlmsg_seq;
428 c.pid = nlh->nlmsg_pid;
429 c.event = nlh->nlmsg_type;
430
431 km_state_notify(x, &c);
432 out:
433 xfrm_state_put(x);
434 return err;
435 }
436
437 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
438 struct rtattr **xfrma,
439 int *errp)
440 {
441 struct xfrm_state *x = NULL;
442 int err;
443
444 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
445 err = -ESRCH;
446 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
447 } else {
448 xfrm_address_t *saddr = NULL;
449
450 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
451 if (err)
452 goto out;
453
454 if (!saddr) {
455 err = -EINVAL;
456 goto out;
457 }
458
459 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
460 p->family);
461 }
462
463 out:
464 if (!x && errp)
465 *errp = err;
466 return x;
467 }
468
469 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
470 {
471 struct xfrm_state *x;
472 int err = -ESRCH;
473 struct km_event c;
474 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
475
476 x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
477 if (x == NULL)
478 return err;
479
480 if ((err = security_xfrm_state_delete(x)) != 0)
481 goto out;
482
483 if (xfrm_state_kern(x)) {
484 err = -EPERM;
485 goto out;
486 }
487
488 err = xfrm_state_delete(x);
489 if (err < 0)
490 goto out;
491
492 c.seq = nlh->nlmsg_seq;
493 c.pid = nlh->nlmsg_pid;
494 c.event = nlh->nlmsg_type;
495 km_state_notify(x, &c);
496
497 out:
498 xfrm_state_put(x);
499 return err;
500 }
501
502 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
503 {
504 memcpy(&p->id, &x->id, sizeof(p->id));
505 memcpy(&p->sel, &x->sel, sizeof(p->sel));
506 memcpy(&p->lft, &x->lft, sizeof(p->lft));
507 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
508 memcpy(&p->stats, &x->stats, sizeof(p->stats));
509 p->saddr = x->props.saddr;
510 p->mode = x->props.mode;
511 p->replay_window = x->props.replay_window;
512 p->reqid = x->props.reqid;
513 p->family = x->props.family;
514 p->flags = x->props.flags;
515 p->seq = x->km.seq;
516 }
517
518 struct xfrm_dump_info {
519 struct sk_buff *in_skb;
520 struct sk_buff *out_skb;
521 u32 nlmsg_seq;
522 u16 nlmsg_flags;
523 int start_idx;
524 int this_idx;
525 };
526
527 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
528 {
529 struct xfrm_dump_info *sp = ptr;
530 struct sk_buff *in_skb = sp->in_skb;
531 struct sk_buff *skb = sp->out_skb;
532 struct xfrm_usersa_info *p;
533 struct nlmsghdr *nlh;
534 unsigned char *b = skb->tail;
535
536 if (sp->this_idx < sp->start_idx)
537 goto out;
538
539 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
540 sp->nlmsg_seq,
541 XFRM_MSG_NEWSA, sizeof(*p));
542 nlh->nlmsg_flags = sp->nlmsg_flags;
543
544 p = NLMSG_DATA(nlh);
545 copy_to_user_state(x, p);
546
547 if (x->aalg)
548 RTA_PUT(skb, XFRMA_ALG_AUTH,
549 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
550 if (x->ealg)
551 RTA_PUT(skb, XFRMA_ALG_CRYPT,
552 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
553 if (x->calg)
554 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
555
556 if (x->encap)
557 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
558
559 if (x->security) {
560 int ctx_size = sizeof(struct xfrm_sec_ctx) +
561 x->security->ctx_len;
562 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
563 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
564
565 uctx->exttype = XFRMA_SEC_CTX;
566 uctx->len = ctx_size;
567 uctx->ctx_doi = x->security->ctx_doi;
568 uctx->ctx_alg = x->security->ctx_alg;
569 uctx->ctx_len = x->security->ctx_len;
570 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
571 }
572 nlh->nlmsg_len = skb->tail - b;
573 out:
574 sp->this_idx++;
575 return 0;
576
577 nlmsg_failure:
578 rtattr_failure:
579 skb_trim(skb, b - skb->data);
580 return -1;
581 }
582
583 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
584 {
585 struct xfrm_dump_info info;
586
587 info.in_skb = cb->skb;
588 info.out_skb = skb;
589 info.nlmsg_seq = cb->nlh->nlmsg_seq;
590 info.nlmsg_flags = NLM_F_MULTI;
591 info.this_idx = 0;
592 info.start_idx = cb->args[0];
593 (void) xfrm_state_walk(0, dump_one_state, &info);
594 cb->args[0] = info.this_idx;
595
596 return skb->len;
597 }
598
599 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
600 struct xfrm_state *x, u32 seq)
601 {
602 struct xfrm_dump_info info;
603 struct sk_buff *skb;
604
605 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
606 if (!skb)
607 return ERR_PTR(-ENOMEM);
608
609 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
610 info.in_skb = in_skb;
611 info.out_skb = skb;
612 info.nlmsg_seq = seq;
613 info.nlmsg_flags = 0;
614 info.this_idx = info.start_idx = 0;
615
616 if (dump_one_state(x, 0, &info)) {
617 kfree_skb(skb);
618 return NULL;
619 }
620
621 return skb;
622 }
623
624 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
625 {
626 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
627 struct xfrm_state *x;
628 struct sk_buff *resp_skb;
629 int err = -ESRCH;
630
631 x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
632 if (x == NULL)
633 goto out_noput;
634
635 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
636 if (IS_ERR(resp_skb)) {
637 err = PTR_ERR(resp_skb);
638 } else {
639 err = netlink_unicast(xfrm_nl, resp_skb,
640 NETLINK_CB(skb).pid, MSG_DONTWAIT);
641 }
642 xfrm_state_put(x);
643 out_noput:
644 return err;
645 }
646
647 static int verify_userspi_info(struct xfrm_userspi_info *p)
648 {
649 switch (p->info.id.proto) {
650 case IPPROTO_AH:
651 case IPPROTO_ESP:
652 break;
653
654 case IPPROTO_COMP:
655 /* IPCOMP spi is 16-bits. */
656 if (p->max >= 0x10000)
657 return -EINVAL;
658 break;
659
660 default:
661 return -EINVAL;
662 };
663
664 if (p->min > p->max)
665 return -EINVAL;
666
667 return 0;
668 }
669
670 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
671 {
672 struct xfrm_state *x;
673 struct xfrm_userspi_info *p;
674 struct sk_buff *resp_skb;
675 xfrm_address_t *daddr;
676 int family;
677 int err;
678
679 p = NLMSG_DATA(nlh);
680 err = verify_userspi_info(p);
681 if (err)
682 goto out_noput;
683
684 family = p->info.family;
685 daddr = &p->info.id.daddr;
686
687 x = NULL;
688 if (p->info.seq) {
689 x = xfrm_find_acq_byseq(p->info.seq);
690 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
691 xfrm_state_put(x);
692 x = NULL;
693 }
694 }
695
696 if (!x)
697 x = xfrm_find_acq(p->info.mode, p->info.reqid,
698 p->info.id.proto, daddr,
699 &p->info.saddr, 1,
700 family);
701 err = -ENOENT;
702 if (x == NULL)
703 goto out_noput;
704
705 resp_skb = ERR_PTR(-ENOENT);
706
707 spin_lock_bh(&x->lock);
708 if (x->km.state != XFRM_STATE_DEAD) {
709 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
710 if (x->id.spi)
711 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
712 }
713 spin_unlock_bh(&x->lock);
714
715 if (IS_ERR(resp_skb)) {
716 err = PTR_ERR(resp_skb);
717 goto out;
718 }
719
720 err = netlink_unicast(xfrm_nl, resp_skb,
721 NETLINK_CB(skb).pid, MSG_DONTWAIT);
722
723 out:
724 xfrm_state_put(x);
725 out_noput:
726 return err;
727 }
728
729 static int verify_policy_dir(__u8 dir)
730 {
731 switch (dir) {
732 case XFRM_POLICY_IN:
733 case XFRM_POLICY_OUT:
734 case XFRM_POLICY_FWD:
735 break;
736
737 default:
738 return -EINVAL;
739 };
740
741 return 0;
742 }
743
744 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
745 {
746 switch (p->share) {
747 case XFRM_SHARE_ANY:
748 case XFRM_SHARE_SESSION:
749 case XFRM_SHARE_USER:
750 case XFRM_SHARE_UNIQUE:
751 break;
752
753 default:
754 return -EINVAL;
755 };
756
757 switch (p->action) {
758 case XFRM_POLICY_ALLOW:
759 case XFRM_POLICY_BLOCK:
760 break;
761
762 default:
763 return -EINVAL;
764 };
765
766 switch (p->sel.family) {
767 case AF_INET:
768 break;
769
770 case AF_INET6:
771 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
772 break;
773 #else
774 return -EAFNOSUPPORT;
775 #endif
776
777 default:
778 return -EINVAL;
779 };
780
781 return verify_policy_dir(p->dir);
782 }
783
784 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
785 {
786 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
787 struct xfrm_user_sec_ctx *uctx;
788
789 if (!rt)
790 return 0;
791
792 uctx = RTA_DATA(rt);
793 return security_xfrm_policy_alloc(pol, uctx);
794 }
795
796 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
797 int nr)
798 {
799 int i;
800
801 xp->xfrm_nr = nr;
802 for (i = 0; i < nr; i++, ut++) {
803 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
804
805 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
806 memcpy(&t->saddr, &ut->saddr,
807 sizeof(xfrm_address_t));
808 t->reqid = ut->reqid;
809 t->mode = ut->mode;
810 t->share = ut->share;
811 t->optional = ut->optional;
812 t->aalgos = ut->aalgos;
813 t->ealgos = ut->ealgos;
814 t->calgos = ut->calgos;
815 }
816 }
817
818 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
819 {
820 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
821 struct xfrm_user_tmpl *utmpl;
822 int nr;
823
824 if (!rt) {
825 pol->xfrm_nr = 0;
826 } else {
827 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
828
829 if (nr > XFRM_MAX_DEPTH)
830 return -EINVAL;
831
832 copy_templates(pol, RTA_DATA(rt), nr);
833 }
834 return 0;
835 }
836
837 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
838 {
839 xp->priority = p->priority;
840 xp->index = p->index;
841 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
842 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
843 xp->action = p->action;
844 xp->flags = p->flags;
845 xp->family = p->sel.family;
846 /* XXX xp->share = p->share; */
847 }
848
849 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
850 {
851 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
852 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
853 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
854 p->priority = xp->priority;
855 p->index = xp->index;
856 p->sel.family = xp->family;
857 p->dir = dir;
858 p->action = xp->action;
859 p->flags = xp->flags;
860 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
861 }
862
863 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
864 {
865 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
866 int err;
867
868 if (!xp) {
869 *errp = -ENOMEM;
870 return NULL;
871 }
872
873 copy_from_user_policy(xp, p);
874
875 if (!(err = copy_from_user_tmpl(xp, xfrma)))
876 err = copy_from_user_sec_ctx(xp, xfrma);
877
878 if (err) {
879 *errp = err;
880 kfree(xp);
881 xp = NULL;
882 }
883
884 return xp;
885 }
886
887 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
888 {
889 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
890 struct xfrm_policy *xp;
891 struct km_event c;
892 int err;
893 int excl;
894
895 err = verify_newpolicy_info(p);
896 if (err)
897 return err;
898 err = verify_sec_ctx_len((struct rtattr **)xfrma);
899 if (err)
900 return err;
901
902 xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err);
903 if (!xp)
904 return err;
905
906 /* shouldnt excl be based on nlh flags??
907 * Aha! this is anti-netlink really i.e more pfkey derived
908 * in netlink excl is a flag and you wouldnt need
909 * a type XFRM_MSG_UPDPOLICY - JHS */
910 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
911 err = xfrm_policy_insert(p->dir, xp, excl);
912 if (err) {
913 security_xfrm_policy_free(xp);
914 kfree(xp);
915 return err;
916 }
917
918 c.event = nlh->nlmsg_type;
919 c.seq = nlh->nlmsg_seq;
920 c.pid = nlh->nlmsg_pid;
921 km_policy_notify(xp, p->dir, &c);
922
923 xfrm_pol_put(xp);
924
925 return 0;
926 }
927
928 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
929 {
930 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
931 int i;
932
933 if (xp->xfrm_nr == 0)
934 return 0;
935
936 for (i = 0; i < xp->xfrm_nr; i++) {
937 struct xfrm_user_tmpl *up = &vec[i];
938 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
939
940 memcpy(&up->id, &kp->id, sizeof(up->id));
941 up->family = xp->family;
942 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
943 up->reqid = kp->reqid;
944 up->mode = kp->mode;
945 up->share = kp->share;
946 up->optional = kp->optional;
947 up->aalgos = kp->aalgos;
948 up->ealgos = kp->ealgos;
949 up->calgos = kp->calgos;
950 }
951 RTA_PUT(skb, XFRMA_TMPL,
952 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
953 vec);
954
955 return 0;
956
957 rtattr_failure:
958 return -1;
959 }
960
961 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
962 {
963 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
964 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
965 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
966
967 uctx->exttype = XFRMA_SEC_CTX;
968 uctx->len = ctx_size;
969 uctx->ctx_doi = s->ctx_doi;
970 uctx->ctx_alg = s->ctx_alg;
971 uctx->ctx_len = s->ctx_len;
972 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
973 return 0;
974
975 rtattr_failure:
976 return -1;
977 }
978
979 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
980 {
981 if (x->security) {
982 return copy_sec_ctx(x->security, skb);
983 }
984 return 0;
985 }
986
987 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
988 {
989 if (xp->security) {
990 return copy_sec_ctx(xp->security, skb);
991 }
992 return 0;
993 }
994
995 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
996 {
997 struct xfrm_dump_info *sp = ptr;
998 struct xfrm_userpolicy_info *p;
999 struct sk_buff *in_skb = sp->in_skb;
1000 struct sk_buff *skb = sp->out_skb;
1001 struct nlmsghdr *nlh;
1002 unsigned char *b = skb->tail;
1003
1004 if (sp->this_idx < sp->start_idx)
1005 goto out;
1006
1007 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1008 sp->nlmsg_seq,
1009 XFRM_MSG_NEWPOLICY, sizeof(*p));
1010 p = NLMSG_DATA(nlh);
1011 nlh->nlmsg_flags = sp->nlmsg_flags;
1012
1013 copy_to_user_policy(xp, p, dir);
1014 if (copy_to_user_tmpl(xp, skb) < 0)
1015 goto nlmsg_failure;
1016 if (copy_to_user_sec_ctx(xp, skb))
1017 goto nlmsg_failure;
1018
1019 nlh->nlmsg_len = skb->tail - b;
1020 out:
1021 sp->this_idx++;
1022 return 0;
1023
1024 nlmsg_failure:
1025 skb_trim(skb, b - skb->data);
1026 return -1;
1027 }
1028
1029 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1030 {
1031 struct xfrm_dump_info info;
1032
1033 info.in_skb = cb->skb;
1034 info.out_skb = skb;
1035 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1036 info.nlmsg_flags = NLM_F_MULTI;
1037 info.this_idx = 0;
1038 info.start_idx = cb->args[0];
1039 (void) xfrm_policy_walk(dump_one_policy, &info);
1040 cb->args[0] = info.this_idx;
1041
1042 return skb->len;
1043 }
1044
1045 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1046 struct xfrm_policy *xp,
1047 int dir, u32 seq)
1048 {
1049 struct xfrm_dump_info info;
1050 struct sk_buff *skb;
1051
1052 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1053 if (!skb)
1054 return ERR_PTR(-ENOMEM);
1055
1056 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
1057 info.in_skb = in_skb;
1058 info.out_skb = skb;
1059 info.nlmsg_seq = seq;
1060 info.nlmsg_flags = 0;
1061 info.this_idx = info.start_idx = 0;
1062
1063 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1064 kfree_skb(skb);
1065 return NULL;
1066 }
1067
1068 return skb;
1069 }
1070
1071 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1072 {
1073 struct xfrm_policy *xp;
1074 struct xfrm_userpolicy_id *p;
1075 int err;
1076 struct km_event c;
1077 int delete;
1078
1079 p = NLMSG_DATA(nlh);
1080 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1081
1082 err = verify_policy_dir(p->dir);
1083 if (err)
1084 return err;
1085
1086 if (p->index)
1087 xp = xfrm_policy_byid(p->dir, p->index, delete);
1088 else {
1089 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1090 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1091 struct xfrm_policy tmp;
1092
1093 err = verify_sec_ctx_len(rtattrs);
1094 if (err)
1095 return err;
1096
1097 memset(&tmp, 0, sizeof(struct xfrm_policy));
1098 if (rt) {
1099 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1100
1101 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1102 return err;
1103 }
1104 xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete);
1105 security_xfrm_policy_free(&tmp);
1106 }
1107 if (xp == NULL)
1108 return -ENOENT;
1109
1110 if (!delete) {
1111 struct sk_buff *resp_skb;
1112
1113 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1114 if (IS_ERR(resp_skb)) {
1115 err = PTR_ERR(resp_skb);
1116 } else {
1117 err = netlink_unicast(xfrm_nl, resp_skb,
1118 NETLINK_CB(skb).pid,
1119 MSG_DONTWAIT);
1120 }
1121 } else {
1122 if ((err = security_xfrm_policy_delete(xp)) != 0)
1123 goto out;
1124 c.data.byid = p->index;
1125 c.event = nlh->nlmsg_type;
1126 c.seq = nlh->nlmsg_seq;
1127 c.pid = nlh->nlmsg_pid;
1128 km_policy_notify(xp, p->dir, &c);
1129 }
1130
1131 xfrm_pol_put(xp);
1132
1133 out:
1134 return err;
1135 }
1136
1137 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1138 {
1139 struct km_event c;
1140 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1141
1142 xfrm_state_flush(p->proto);
1143 c.data.proto = p->proto;
1144 c.event = nlh->nlmsg_type;
1145 c.seq = nlh->nlmsg_seq;
1146 c.pid = nlh->nlmsg_pid;
1147 km_state_notify(NULL, &c);
1148
1149 return 0;
1150 }
1151
1152
1153 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1154 {
1155 struct xfrm_aevent_id *id;
1156 struct nlmsghdr *nlh;
1157 struct xfrm_lifetime_cur ltime;
1158 unsigned char *b = skb->tail;
1159
1160 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1161 id = NLMSG_DATA(nlh);
1162 nlh->nlmsg_flags = 0;
1163
1164 id->sa_id.daddr = x->id.daddr;
1165 id->sa_id.spi = x->id.spi;
1166 id->sa_id.family = x->props.family;
1167 id->sa_id.proto = x->id.proto;
1168 id->flags = c->data.aevent;
1169
1170 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1171
1172 ltime.bytes = x->curlft.bytes;
1173 ltime.packets = x->curlft.packets;
1174 ltime.add_time = x->curlft.add_time;
1175 ltime.use_time = x->curlft.use_time;
1176
1177 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1178
1179 if (id->flags&XFRM_AE_RTHR) {
1180 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1181 }
1182
1183 if (id->flags&XFRM_AE_ETHR) {
1184 u32 etimer = x->replay_maxage*10/HZ;
1185 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1186 }
1187
1188 nlh->nlmsg_len = skb->tail - b;
1189 return skb->len;
1190
1191 rtattr_failure:
1192 nlmsg_failure:
1193 skb_trim(skb, b - skb->data);
1194 return -1;
1195 }
1196
1197 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1198 {
1199 struct xfrm_state *x;
1200 struct sk_buff *r_skb;
1201 int err;
1202 struct km_event c;
1203 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1204 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1205 struct xfrm_usersa_id *id = &p->sa_id;
1206
1207 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1208 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1209
1210 if (p->flags&XFRM_AE_RTHR)
1211 len+=RTA_SPACE(sizeof(u32));
1212
1213 if (p->flags&XFRM_AE_ETHR)
1214 len+=RTA_SPACE(sizeof(u32));
1215
1216 r_skb = alloc_skb(len, GFP_ATOMIC);
1217 if (r_skb == NULL)
1218 return -ENOMEM;
1219
1220 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1221 if (x == NULL) {
1222 kfree(r_skb);
1223 return -ESRCH;
1224 }
1225
1226 /*
1227 * XXX: is this lock really needed - none of the other
1228 * gets lock (the concern is things getting updated
1229 * while we are still reading) - jhs
1230 */
1231 spin_lock_bh(&x->lock);
1232 c.data.aevent = p->flags;
1233 c.seq = nlh->nlmsg_seq;
1234 c.pid = nlh->nlmsg_pid;
1235
1236 if (build_aevent(r_skb, x, &c) < 0)
1237 BUG();
1238 err = netlink_unicast(xfrm_nl, r_skb,
1239 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1240 spin_unlock_bh(&x->lock);
1241 xfrm_state_put(x);
1242 return err;
1243 }
1244
1245 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1246 {
1247 struct xfrm_state *x;
1248 struct km_event c;
1249 int err = - EINVAL;
1250 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1251 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1252 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1253
1254 if (!lt && !rp)
1255 return err;
1256
1257 /* pedantic mode - thou shalt sayeth replaceth */
1258 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1259 return err;
1260
1261 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1262 if (x == NULL)
1263 return -ESRCH;
1264
1265 if (x->km.state != XFRM_STATE_VALID)
1266 goto out;
1267
1268 spin_lock_bh(&x->lock);
1269 err = xfrm_update_ae_params(x,(struct rtattr **)xfrma);
1270 spin_unlock_bh(&x->lock);
1271 if (err < 0)
1272 goto out;
1273
1274 c.event = nlh->nlmsg_type;
1275 c.seq = nlh->nlmsg_seq;
1276 c.pid = nlh->nlmsg_pid;
1277 c.data.aevent = XFRM_AE_CU;
1278 km_state_notify(x, &c);
1279 err = 0;
1280 out:
1281 xfrm_state_put(x);
1282 return err;
1283 }
1284
1285 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1286 {
1287 struct km_event c;
1288
1289 xfrm_policy_flush();
1290 c.event = nlh->nlmsg_type;
1291 c.seq = nlh->nlmsg_seq;
1292 c.pid = nlh->nlmsg_pid;
1293 km_policy_notify(NULL, 0, &c);
1294 return 0;
1295 }
1296
1297 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1298 {
1299 struct xfrm_policy *xp;
1300 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1301 struct xfrm_userpolicy_info *p = &up->pol;
1302 int err = -ENOENT;
1303
1304 if (p->index)
1305 xp = xfrm_policy_byid(p->dir, p->index, 0);
1306 else {
1307 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1308 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1309 struct xfrm_policy tmp;
1310
1311 err = verify_sec_ctx_len(rtattrs);
1312 if (err)
1313 return err;
1314
1315 memset(&tmp, 0, sizeof(struct xfrm_policy));
1316 if (rt) {
1317 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1318
1319 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1320 return err;
1321 }
1322 xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0);
1323 security_xfrm_policy_free(&tmp);
1324 }
1325
1326 if (xp == NULL)
1327 return err;
1328 read_lock(&xp->lock);
1329 if (xp->dead) {
1330 read_unlock(&xp->lock);
1331 goto out;
1332 }
1333
1334 read_unlock(&xp->lock);
1335 err = 0;
1336 if (up->hard) {
1337 xfrm_policy_delete(xp, p->dir);
1338 } else {
1339 // reset the timers here?
1340 printk("Dont know what to do with soft policy expire\n");
1341 }
1342 km_policy_expired(xp, p->dir, up->hard, current->pid);
1343
1344 out:
1345 xfrm_pol_put(xp);
1346 return err;
1347 }
1348
1349 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1350 {
1351 struct xfrm_state *x;
1352 int err;
1353 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1354 struct xfrm_usersa_info *p = &ue->state;
1355
1356 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1357 err = -ENOENT;
1358
1359 if (x == NULL)
1360 return err;
1361
1362 err = -EINVAL;
1363
1364 spin_lock_bh(&x->lock);
1365 if (x->km.state != XFRM_STATE_VALID)
1366 goto out;
1367 km_state_expired(x, ue->hard, current->pid);
1368
1369 if (ue->hard)
1370 __xfrm_state_delete(x);
1371 out:
1372 spin_unlock_bh(&x->lock);
1373 xfrm_state_put(x);
1374 return err;
1375 }
1376
1377 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1378 {
1379 struct xfrm_policy *xp;
1380 struct xfrm_user_tmpl *ut;
1381 int i;
1382 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1383
1384 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1385 struct xfrm_state *x = xfrm_state_alloc();
1386 int err = -ENOMEM;
1387
1388 if (!x)
1389 return err;
1390
1391 err = verify_newpolicy_info(&ua->policy);
1392 if (err) {
1393 printk("BAD policy passed\n");
1394 kfree(x);
1395 return err;
1396 }
1397
1398 /* build an XP */
1399 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) {
1400 kfree(x);
1401 return err;
1402 }
1403
1404 memcpy(&x->id, &ua->id, sizeof(ua->id));
1405 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1406 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1407
1408 ut = RTA_DATA(rt);
1409 /* extract the templates and for each call km_key */
1410 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1411 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1412 memcpy(&x->id, &t->id, sizeof(x->id));
1413 x->props.mode = t->mode;
1414 x->props.reqid = t->reqid;
1415 x->props.family = ut->family;
1416 t->aalgos = ua->aalgos;
1417 t->ealgos = ua->ealgos;
1418 t->calgos = ua->calgos;
1419 err = km_query(x, t, xp);
1420
1421 }
1422
1423 kfree(x);
1424 kfree(xp);
1425
1426 return 0;
1427 }
1428
1429
1430 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1431
1432 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1433 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1434 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1435 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1436 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1437 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1438 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1439 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1440 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1441 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1442 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1443 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1444 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1445 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1446 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1447 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1448 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1449 };
1450
1451 #undef XMSGSIZE
1452
1453 static struct xfrm_link {
1454 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
1455 int (*dump)(struct sk_buff *, struct netlink_callback *);
1456 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1457 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1458 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1459 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1460 .dump = xfrm_dump_sa },
1461 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1462 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1463 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1464 .dump = xfrm_dump_policy },
1465 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1466 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1467 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1468 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1469 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1470 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1471 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1472 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1473 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1474 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1475 };
1476
1477 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
1478 {
1479 struct rtattr *xfrma[XFRMA_MAX];
1480 struct xfrm_link *link;
1481 int type, min_len;
1482
1483 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
1484 return 0;
1485
1486 type = nlh->nlmsg_type;
1487
1488 /* A control message: ignore them */
1489 if (type < XFRM_MSG_BASE)
1490 return 0;
1491
1492 /* Unknown message: reply with EINVAL */
1493 if (type > XFRM_MSG_MAX)
1494 goto err_einval;
1495
1496 type -= XFRM_MSG_BASE;
1497 link = &xfrm_dispatch[type];
1498
1499 /* All operations require privileges, even GET */
1500 if (security_netlink_recv(skb, CAP_NET_ADMIN)) {
1501 *errp = -EPERM;
1502 return -1;
1503 }
1504
1505 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1506 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1507 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1508 if (link->dump == NULL)
1509 goto err_einval;
1510
1511 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
1512 link->dump, NULL)) != 0) {
1513 return -1;
1514 }
1515
1516 netlink_queue_skip(nlh, skb);
1517 return -1;
1518 }
1519
1520 memset(xfrma, 0, sizeof(xfrma));
1521
1522 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1523 goto err_einval;
1524
1525 if (nlh->nlmsg_len > min_len) {
1526 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1527 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1528
1529 while (RTA_OK(attr, attrlen)) {
1530 unsigned short flavor = attr->rta_type;
1531 if (flavor) {
1532 if (flavor > XFRMA_MAX)
1533 goto err_einval;
1534 xfrma[flavor - 1] = attr;
1535 }
1536 attr = RTA_NEXT(attr, attrlen);
1537 }
1538 }
1539
1540 if (link->doit == NULL)
1541 goto err_einval;
1542 *errp = link->doit(skb, nlh, (void **) &xfrma);
1543
1544 return *errp;
1545
1546 err_einval:
1547 *errp = -EINVAL;
1548 return -1;
1549 }
1550
1551 static void xfrm_netlink_rcv(struct sock *sk, int len)
1552 {
1553 unsigned int qlen = 0;
1554
1555 do {
1556 mutex_lock(&xfrm_cfg_mutex);
1557 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
1558 mutex_unlock(&xfrm_cfg_mutex);
1559
1560 } while (qlen);
1561 }
1562
1563 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1564 {
1565 struct xfrm_user_expire *ue;
1566 struct nlmsghdr *nlh;
1567 unsigned char *b = skb->tail;
1568
1569 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1570 sizeof(*ue));
1571 ue = NLMSG_DATA(nlh);
1572 nlh->nlmsg_flags = 0;
1573
1574 copy_to_user_state(x, &ue->state);
1575 ue->hard = (c->data.hard != 0) ? 1 : 0;
1576
1577 nlh->nlmsg_len = skb->tail - b;
1578 return skb->len;
1579
1580 nlmsg_failure:
1581 skb_trim(skb, b - skb->data);
1582 return -1;
1583 }
1584
1585 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1586 {
1587 struct sk_buff *skb;
1588 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1589
1590 skb = alloc_skb(len, GFP_ATOMIC);
1591 if (skb == NULL)
1592 return -ENOMEM;
1593
1594 if (build_expire(skb, x, c) < 0)
1595 BUG();
1596
1597 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1598 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1599 }
1600
1601 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1602 {
1603 struct sk_buff *skb;
1604 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1605
1606 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1607 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1608 skb = alloc_skb(len, GFP_ATOMIC);
1609 if (skb == NULL)
1610 return -ENOMEM;
1611
1612 if (build_aevent(skb, x, c) < 0)
1613 BUG();
1614
1615 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
1616 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1617 }
1618
1619 static int xfrm_notify_sa_flush(struct km_event *c)
1620 {
1621 struct xfrm_usersa_flush *p;
1622 struct nlmsghdr *nlh;
1623 struct sk_buff *skb;
1624 unsigned char *b;
1625 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1626
1627 skb = alloc_skb(len, GFP_ATOMIC);
1628 if (skb == NULL)
1629 return -ENOMEM;
1630 b = skb->tail;
1631
1632 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1633 XFRM_MSG_FLUSHSA, sizeof(*p));
1634 nlh->nlmsg_flags = 0;
1635
1636 p = NLMSG_DATA(nlh);
1637 p->proto = c->data.proto;
1638
1639 nlh->nlmsg_len = skb->tail - b;
1640
1641 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1642 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1643
1644 nlmsg_failure:
1645 kfree_skb(skb);
1646 return -1;
1647 }
1648
1649 static int inline xfrm_sa_len(struct xfrm_state *x)
1650 {
1651 int l = 0;
1652 if (x->aalg)
1653 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1654 if (x->ealg)
1655 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1656 if (x->calg)
1657 l += RTA_SPACE(sizeof(*x->calg));
1658 if (x->encap)
1659 l += RTA_SPACE(sizeof(*x->encap));
1660
1661 return l;
1662 }
1663
1664 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1665 {
1666 struct xfrm_usersa_info *p;
1667 struct xfrm_usersa_id *id;
1668 struct nlmsghdr *nlh;
1669 struct sk_buff *skb;
1670 unsigned char *b;
1671 int len = xfrm_sa_len(x);
1672 int headlen;
1673
1674 headlen = sizeof(*p);
1675 if (c->event == XFRM_MSG_DELSA) {
1676 len += RTA_SPACE(headlen);
1677 headlen = sizeof(*id);
1678 }
1679 len += NLMSG_SPACE(headlen);
1680
1681 skb = alloc_skb(len, GFP_ATOMIC);
1682 if (skb == NULL)
1683 return -ENOMEM;
1684 b = skb->tail;
1685
1686 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1687 nlh->nlmsg_flags = 0;
1688
1689 p = NLMSG_DATA(nlh);
1690 if (c->event == XFRM_MSG_DELSA) {
1691 id = NLMSG_DATA(nlh);
1692 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1693 id->spi = x->id.spi;
1694 id->family = x->props.family;
1695 id->proto = x->id.proto;
1696
1697 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1698 }
1699
1700 copy_to_user_state(x, p);
1701
1702 if (x->aalg)
1703 RTA_PUT(skb, XFRMA_ALG_AUTH,
1704 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1705 if (x->ealg)
1706 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1707 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1708 if (x->calg)
1709 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1710
1711 if (x->encap)
1712 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1713
1714 nlh->nlmsg_len = skb->tail - b;
1715
1716 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1717 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1718
1719 nlmsg_failure:
1720 rtattr_failure:
1721 kfree_skb(skb);
1722 return -1;
1723 }
1724
1725 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1726 {
1727
1728 switch (c->event) {
1729 case XFRM_MSG_EXPIRE:
1730 return xfrm_exp_state_notify(x, c);
1731 case XFRM_MSG_NEWAE:
1732 return xfrm_aevent_state_notify(x, c);
1733 case XFRM_MSG_DELSA:
1734 case XFRM_MSG_UPDSA:
1735 case XFRM_MSG_NEWSA:
1736 return xfrm_notify_sa(x, c);
1737 case XFRM_MSG_FLUSHSA:
1738 return xfrm_notify_sa_flush(c);
1739 default:
1740 printk("xfrm_user: Unknown SA event %d\n", c->event);
1741 break;
1742 }
1743
1744 return 0;
1745
1746 }
1747
1748 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1749 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1750 int dir)
1751 {
1752 struct xfrm_user_acquire *ua;
1753 struct nlmsghdr *nlh;
1754 unsigned char *b = skb->tail;
1755 __u32 seq = xfrm_get_acqseq();
1756
1757 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1758 sizeof(*ua));
1759 ua = NLMSG_DATA(nlh);
1760 nlh->nlmsg_flags = 0;
1761
1762 memcpy(&ua->id, &x->id, sizeof(ua->id));
1763 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1764 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1765 copy_to_user_policy(xp, &ua->policy, dir);
1766 ua->aalgos = xt->aalgos;
1767 ua->ealgos = xt->ealgos;
1768 ua->calgos = xt->calgos;
1769 ua->seq = x->km.seq = seq;
1770
1771 if (copy_to_user_tmpl(xp, skb) < 0)
1772 goto nlmsg_failure;
1773 if (copy_to_user_state_sec_ctx(x, skb))
1774 goto nlmsg_failure;
1775
1776 nlh->nlmsg_len = skb->tail - b;
1777 return skb->len;
1778
1779 nlmsg_failure:
1780 skb_trim(skb, b - skb->data);
1781 return -1;
1782 }
1783
1784 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1785 struct xfrm_policy *xp, int dir)
1786 {
1787 struct sk_buff *skb;
1788 size_t len;
1789
1790 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1791 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1792 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
1793 skb = alloc_skb(len, GFP_ATOMIC);
1794 if (skb == NULL)
1795 return -ENOMEM;
1796
1797 if (build_acquire(skb, x, xt, xp, dir) < 0)
1798 BUG();
1799
1800 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
1801 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1802 }
1803
1804 /* User gives us xfrm_user_policy_info followed by an array of 0
1805 * or more templates.
1806 */
1807 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1808 u8 *data, int len, int *dir)
1809 {
1810 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1811 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1812 struct xfrm_policy *xp;
1813 int nr;
1814
1815 switch (sk->sk_family) {
1816 case AF_INET:
1817 if (opt != IP_XFRM_POLICY) {
1818 *dir = -EOPNOTSUPP;
1819 return NULL;
1820 }
1821 break;
1822 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1823 case AF_INET6:
1824 if (opt != IPV6_XFRM_POLICY) {
1825 *dir = -EOPNOTSUPP;
1826 return NULL;
1827 }
1828 break;
1829 #endif
1830 default:
1831 *dir = -EINVAL;
1832 return NULL;
1833 }
1834
1835 *dir = -EINVAL;
1836
1837 if (len < sizeof(*p) ||
1838 verify_newpolicy_info(p))
1839 return NULL;
1840
1841 nr = ((len - sizeof(*p)) / sizeof(*ut));
1842 if (nr > XFRM_MAX_DEPTH)
1843 return NULL;
1844
1845 if (p->dir > XFRM_POLICY_OUT)
1846 return NULL;
1847
1848 xp = xfrm_policy_alloc(GFP_KERNEL);
1849 if (xp == NULL) {
1850 *dir = -ENOBUFS;
1851 return NULL;
1852 }
1853
1854 copy_from_user_policy(xp, p);
1855 copy_templates(xp, ut, nr);
1856
1857 if (!xp->security) {
1858 int err = security_xfrm_sock_policy_alloc(xp, sk);
1859 if (err) {
1860 kfree(xp);
1861 *dir = err;
1862 return NULL;
1863 }
1864 }
1865
1866 *dir = p->dir;
1867
1868 return xp;
1869 }
1870
1871 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1872 int dir, struct km_event *c)
1873 {
1874 struct xfrm_user_polexpire *upe;
1875 struct nlmsghdr *nlh;
1876 int hard = c->data.hard;
1877 unsigned char *b = skb->tail;
1878
1879 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1880 upe = NLMSG_DATA(nlh);
1881 nlh->nlmsg_flags = 0;
1882
1883 copy_to_user_policy(xp, &upe->pol, dir);
1884 if (copy_to_user_tmpl(xp, skb) < 0)
1885 goto nlmsg_failure;
1886 if (copy_to_user_sec_ctx(xp, skb))
1887 goto nlmsg_failure;
1888 upe->hard = !!hard;
1889
1890 nlh->nlmsg_len = skb->tail - b;
1891 return skb->len;
1892
1893 nlmsg_failure:
1894 skb_trim(skb, b - skb->data);
1895 return -1;
1896 }
1897
1898 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1899 {
1900 struct sk_buff *skb;
1901 size_t len;
1902
1903 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1904 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1905 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
1906 skb = alloc_skb(len, GFP_ATOMIC);
1907 if (skb == NULL)
1908 return -ENOMEM;
1909
1910 if (build_polexpire(skb, xp, dir, c) < 0)
1911 BUG();
1912
1913 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1914 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1915 }
1916
1917 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1918 {
1919 struct xfrm_userpolicy_info *p;
1920 struct xfrm_userpolicy_id *id;
1921 struct nlmsghdr *nlh;
1922 struct sk_buff *skb;
1923 unsigned char *b;
1924 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1925 int headlen;
1926
1927 headlen = sizeof(*p);
1928 if (c->event == XFRM_MSG_DELPOLICY) {
1929 len += RTA_SPACE(headlen);
1930 headlen = sizeof(*id);
1931 }
1932 len += NLMSG_SPACE(headlen);
1933
1934 skb = alloc_skb(len, GFP_ATOMIC);
1935 if (skb == NULL)
1936 return -ENOMEM;
1937 b = skb->tail;
1938
1939 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1940
1941 p = NLMSG_DATA(nlh);
1942 if (c->event == XFRM_MSG_DELPOLICY) {
1943 id = NLMSG_DATA(nlh);
1944 memset(id, 0, sizeof(*id));
1945 id->dir = dir;
1946 if (c->data.byid)
1947 id->index = xp->index;
1948 else
1949 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
1950
1951 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
1952 }
1953
1954 nlh->nlmsg_flags = 0;
1955
1956 copy_to_user_policy(xp, p, dir);
1957 if (copy_to_user_tmpl(xp, skb) < 0)
1958 goto nlmsg_failure;
1959
1960 nlh->nlmsg_len = skb->tail - b;
1961
1962 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
1963 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
1964
1965 nlmsg_failure:
1966 rtattr_failure:
1967 kfree_skb(skb);
1968 return -1;
1969 }
1970
1971 static int xfrm_notify_policy_flush(struct km_event *c)
1972 {
1973 struct nlmsghdr *nlh;
1974 struct sk_buff *skb;
1975 unsigned char *b;
1976 int len = NLMSG_LENGTH(0);
1977
1978 skb = alloc_skb(len, GFP_ATOMIC);
1979 if (skb == NULL)
1980 return -ENOMEM;
1981 b = skb->tail;
1982
1983
1984 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
1985
1986 nlh->nlmsg_len = skb->tail - b;
1987
1988 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
1989 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
1990
1991 nlmsg_failure:
1992 kfree_skb(skb);
1993 return -1;
1994 }
1995
1996 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1997 {
1998
1999 switch (c->event) {
2000 case XFRM_MSG_NEWPOLICY:
2001 case XFRM_MSG_UPDPOLICY:
2002 case XFRM_MSG_DELPOLICY:
2003 return xfrm_notify_policy(xp, dir, c);
2004 case XFRM_MSG_FLUSHPOLICY:
2005 return xfrm_notify_policy_flush(c);
2006 case XFRM_MSG_POLEXPIRE:
2007 return xfrm_exp_policy_notify(xp, dir, c);
2008 default:
2009 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2010 }
2011
2012 return 0;
2013
2014 }
2015
2016 static struct xfrm_mgr netlink_mgr = {
2017 .id = "netlink",
2018 .notify = xfrm_send_state_notify,
2019 .acquire = xfrm_send_acquire,
2020 .compile_policy = xfrm_compile_policy,
2021 .notify_policy = xfrm_send_policy_notify,
2022 };
2023
2024 static int __init xfrm_user_init(void)
2025 {
2026 struct sock *nlsk;
2027
2028 printk(KERN_INFO "Initializing IPsec netlink socket\n");
2029
2030 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2031 xfrm_netlink_rcv, THIS_MODULE);
2032 if (nlsk == NULL)
2033 return -ENOMEM;
2034 rcu_assign_pointer(xfrm_nl, nlsk);
2035
2036 xfrm_register_km(&netlink_mgr);
2037
2038 return 0;
2039 }
2040
2041 static void __exit xfrm_user_exit(void)
2042 {
2043 struct sock *nlsk = xfrm_nl;
2044
2045 xfrm_unregister_km(&netlink_mgr);
2046 rcu_assign_pointer(xfrm_nl, NULL);
2047 synchronize_rcu();
2048 sock_release(nlsk->sk_socket);
2049 }
2050
2051 module_init(xfrm_user_init);
2052 module_exit(xfrm_user_exit);
2053 MODULE_LICENSE("GPL");
2054 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2055
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