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[POWERPC] Fix iseries/smp.c for irq breakage
[linux-2.6/mini2440.git] / net / xfrm / xfrm_user.c
blobd54b3a70d5dfb6cda89a8661a0ee380c078d791d
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
35 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
36 {
37 struct rtattr *rt = xfrma[type - 1];
38 struct xfrm_algo *algp;
39 int len;
40
41 if (!rt)
42 return 0;
43
44 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
45 if (len < 0)
46 return -EINVAL;
47
48 algp = RTA_DATA(rt);
49
50 len -= (algp->alg_key_len + 7U) / 8;
51 if (len < 0)
52 return -EINVAL;
53
54 switch (type) {
55 case XFRMA_ALG_AUTH:
56 if (!algp->alg_key_len &&
57 strcmp(algp->alg_name, "digest_null") != 0)
58 return -EINVAL;
59 break;
60
61 case XFRMA_ALG_CRYPT:
62 if (!algp->alg_key_len &&
63 strcmp(algp->alg_name, "cipher_null") != 0)
64 return -EINVAL;
65 break;
66
67 case XFRMA_ALG_COMP:
68 /* Zero length keys are legal. */
69 break;
70
71 default:
72 return -EINVAL;
73 };
74
75 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
76 return 0;
77 }
78
79 static int verify_encap_tmpl(struct rtattr **xfrma)
80 {
81 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
82 struct xfrm_encap_tmpl *encap;
83
84 if (!rt)
85 return 0;
86
87 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
88 return -EINVAL;
89
90 return 0;
91 }
92
93 static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
94 xfrm_address_t **addrp)
95 {
96 struct rtattr *rt = xfrma[type - 1];
97
98 if (!rt)
99 return 0;
100
101 if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
102 return -EINVAL;
103
104 if (addrp)
105 *addrp = RTA_DATA(rt);
106
107 return 0;
108 }
109
110 static inline int verify_sec_ctx_len(struct rtattr **xfrma)
111 {
112 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
113 struct xfrm_user_sec_ctx *uctx;
114 int len = 0;
115
116 if (!rt)
117 return 0;
118
119 if (rt->rta_len < sizeof(*uctx))
120 return -EINVAL;
121
122 uctx = RTA_DATA(rt);
123
124 len += sizeof(struct xfrm_user_sec_ctx);
125 len += uctx->ctx_len;
126
127 if (uctx->len != len)
128 return -EINVAL;
129
130 return 0;
131 }
132
133
134 static int verify_newsa_info(struct xfrm_usersa_info *p,
135 struct rtattr **xfrma)
136 {
137 int err;
138
139 err = -EINVAL;
140 switch (p->family) {
141 case AF_INET:
142 break;
143
144 case AF_INET6:
145 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
146 break;
147 #else
148 err = -EAFNOSUPPORT;
149 goto out;
150 #endif
151
152 default:
153 goto out;
154 };
155
156 err = -EINVAL;
157 switch (p->id.proto) {
158 case IPPROTO_AH:
159 if (!xfrma[XFRMA_ALG_AUTH-1] ||
160 xfrma[XFRMA_ALG_CRYPT-1] ||
161 xfrma[XFRMA_ALG_COMP-1])
162 goto out;
163 break;
164
165 case IPPROTO_ESP:
166 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
167 !xfrma[XFRMA_ALG_CRYPT-1]) ||
168 xfrma[XFRMA_ALG_COMP-1])
169 goto out;
170 break;
171
172 case IPPROTO_COMP:
173 if (!xfrma[XFRMA_ALG_COMP-1] ||
174 xfrma[XFRMA_ALG_AUTH-1] ||
175 xfrma[XFRMA_ALG_CRYPT-1])
176 goto out;
177 break;
178
179 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
180 case IPPROTO_DSTOPTS:
181 case IPPROTO_ROUTING:
182 if (xfrma[XFRMA_ALG_COMP-1] ||
183 xfrma[XFRMA_ALG_AUTH-1] ||
184 xfrma[XFRMA_ALG_CRYPT-1] ||
185 xfrma[XFRMA_ENCAP-1] ||
186 xfrma[XFRMA_SEC_CTX-1] ||
187 !xfrma[XFRMA_COADDR-1])
188 goto out;
189 break;
190 #endif
191
192 default:
193 goto out;
194 };
195
196 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
197 goto out;
198 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
199 goto out;
200 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
201 goto out;
202 if ((err = verify_encap_tmpl(xfrma)))
203 goto out;
204 if ((err = verify_sec_ctx_len(xfrma)))
205 goto out;
206 if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
207 goto out;
208
209 err = -EINVAL;
210 switch (p->mode) {
211 case XFRM_MODE_TRANSPORT:
212 case XFRM_MODE_TUNNEL:
213 case XFRM_MODE_ROUTEOPTIMIZATION:
214 case XFRM_MODE_BEET:
215 break;
216
217 default:
218 goto out;
219 };
220
221 err = 0;
222
223 out:
224 return err;
225 }
226
227 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
228 struct xfrm_algo_desc *(*get_byname)(char *, int),
229 struct rtattr *u_arg)
230 {
231 struct rtattr *rta = u_arg;
232 struct xfrm_algo *p, *ualg;
233 struct xfrm_algo_desc *algo;
234 int len;
235
236 if (!rta)
237 return 0;
238
239 ualg = RTA_DATA(rta);
240
241 algo = get_byname(ualg->alg_name, 1);
242 if (!algo)
243 return -ENOSYS;
244 *props = algo->desc.sadb_alg_id;
245
246 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
247 p = kmalloc(len, GFP_KERNEL);
248 if (!p)
249 return -ENOMEM;
250
251 memcpy(p, ualg, len);
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 = kmalloc(sizeof(*p), GFP_KERNEL);
267 if (!p)
268 return -ENOMEM;
269
270 memcpy(p, uencap, sizeof(*p));
271 *encapp = p;
272 return 0;
273 }
274
275
276 static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp)
277 {
278 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
279 int len = 0;
280
281 if (xfrm_ctx) {
282 len += sizeof(struct xfrm_user_sec_ctx);
283 len += xfrm_ctx->ctx_len;
284 }
285 return len;
286 }
287
288 static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
289 {
290 struct xfrm_user_sec_ctx *uctx;
291
292 if (!u_arg)
293 return 0;
294
295 uctx = RTA_DATA(u_arg);
296 return security_xfrm_state_alloc(x, uctx);
297 }
298
299 static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
300 {
301 struct rtattr *rta = u_arg;
302 xfrm_address_t *p, *uaddrp;
303
304 if (!rta)
305 return 0;
306
307 uaddrp = RTA_DATA(rta);
308 p = kmalloc(sizeof(*p), GFP_KERNEL);
309 if (!p)
310 return -ENOMEM;
311
312 memcpy(p, uaddrp, sizeof(*p));
313 *addrpp = p;
314 return 0;
315 }
316
317 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
318 {
319 memcpy(&x->id, &p->id, sizeof(x->id));
320 memcpy(&x->sel, &p->sel, sizeof(x->sel));
321 memcpy(&x->lft, &p->lft, sizeof(x->lft));
322 x->props.mode = p->mode;
323 x->props.replay_window = p->replay_window;
324 x->props.reqid = p->reqid;
325 x->props.family = p->family;
326 x->props.saddr = p->saddr;
327 x->props.flags = p->flags;
328 }
329
330 /*
331 * someday when pfkey also has support, we could have the code
332 * somehow made shareable and move it to xfrm_state.c - JHS
333 *
334 */
335 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
336 {
337 int err = - EINVAL;
338 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
339 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
340 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
341 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
342
343 if (rp) {
344 struct xfrm_replay_state *replay;
345 if (RTA_PAYLOAD(rp) < sizeof(*replay))
346 goto error;
347 replay = RTA_DATA(rp);
348 memcpy(&x->replay, replay, sizeof(*replay));
349 memcpy(&x->preplay, replay, sizeof(*replay));
350 }
351
352 if (lt) {
353 struct xfrm_lifetime_cur *ltime;
354 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
355 goto error;
356 ltime = RTA_DATA(lt);
357 x->curlft.bytes = ltime->bytes;
358 x->curlft.packets = ltime->packets;
359 x->curlft.add_time = ltime->add_time;
360 x->curlft.use_time = ltime->use_time;
361 }
362
363 if (et) {
364 if (RTA_PAYLOAD(et) < sizeof(u32))
365 goto error;
366 x->replay_maxage = *(u32*)RTA_DATA(et);
367 }
368
369 if (rt) {
370 if (RTA_PAYLOAD(rt) < sizeof(u32))
371 goto error;
372 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
373 }
374
375 return 0;
376 error:
377 return err;
378 }
379
380 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
381 struct rtattr **xfrma,
382 int *errp)
383 {
384 struct xfrm_state *x = xfrm_state_alloc();
385 int err = -ENOMEM;
386
387 if (!x)
388 goto error_no_put;
389
390 copy_from_user_state(x, p);
391
392 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
393 xfrm_aalg_get_byname,
394 xfrma[XFRMA_ALG_AUTH-1])))
395 goto error;
396 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
397 xfrm_ealg_get_byname,
398 xfrma[XFRMA_ALG_CRYPT-1])))
399 goto error;
400 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
401 xfrm_calg_get_byname,
402 xfrma[XFRMA_ALG_COMP-1])))
403 goto error;
404 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
405 goto error;
406 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
407 goto error;
408 err = xfrm_init_state(x);
409 if (err)
410 goto error;
411
412 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
413 goto error;
414
415 x->km.seq = p->seq;
416 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
417 /* sysctl_xfrm_aevent_etime is in 100ms units */
418 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
419 x->preplay.bitmap = 0;
420 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
421 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
422
423 /* override default values from above */
424
425 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
426 if (err < 0)
427 goto error;
428
429 return x;
430
431 error:
432 x->km.state = XFRM_STATE_DEAD;
433 xfrm_state_put(x);
434 error_no_put:
435 *errp = err;
436 return NULL;
437 }
438
439 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
440 {
441 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
442 struct xfrm_state *x;
443 int err;
444 struct km_event c;
445
446 err = verify_newsa_info(p, (struct rtattr **)xfrma);
447 if (err)
448 return err;
449
450 x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err);
451 if (!x)
452 return err;
453
454 xfrm_state_hold(x);
455 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
456 err = xfrm_state_add(x);
457 else
458 err = xfrm_state_update(x);
459
460 if (err < 0) {
461 x->km.state = XFRM_STATE_DEAD;
462 __xfrm_state_put(x);
463 goto out;
464 }
465
466 c.seq = nlh->nlmsg_seq;
467 c.pid = nlh->nlmsg_pid;
468 c.event = nlh->nlmsg_type;
469
470 km_state_notify(x, &c);
471 out:
472 xfrm_state_put(x);
473 return err;
474 }
475
476 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
477 struct rtattr **xfrma,
478 int *errp)
479 {
480 struct xfrm_state *x = NULL;
481 int err;
482
483 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
484 err = -ESRCH;
485 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
486 } else {
487 xfrm_address_t *saddr = NULL;
488
489 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
490 if (err)
491 goto out;
492
493 if (!saddr) {
494 err = -EINVAL;
495 goto out;
496 }
497
498 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
499 p->family);
500 }
501
502 out:
503 if (!x && errp)
504 *errp = err;
505 return x;
506 }
507
508 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
509 {
510 struct xfrm_state *x;
511 int err = -ESRCH;
512 struct km_event c;
513 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
514
515 x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
516 if (x == NULL)
517 return err;
518
519 if ((err = security_xfrm_state_delete(x)) != 0)
520 goto out;
521
522 if (xfrm_state_kern(x)) {
523 err = -EPERM;
524 goto out;
525 }
526
527 err = xfrm_state_delete(x);
528 if (err < 0)
529 goto out;
530
531 c.seq = nlh->nlmsg_seq;
532 c.pid = nlh->nlmsg_pid;
533 c.event = nlh->nlmsg_type;
534 km_state_notify(x, &c);
535
536 out:
537 xfrm_state_put(x);
538 return err;
539 }
540
541 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
542 {
543 memcpy(&p->id, &x->id, sizeof(p->id));
544 memcpy(&p->sel, &x->sel, sizeof(p->sel));
545 memcpy(&p->lft, &x->lft, sizeof(p->lft));
546 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
547 memcpy(&p->stats, &x->stats, sizeof(p->stats));
548 p->saddr = x->props.saddr;
549 p->mode = x->props.mode;
550 p->replay_window = x->props.replay_window;
551 p->reqid = x->props.reqid;
552 p->family = x->props.family;
553 p->flags = x->props.flags;
554 p->seq = x->km.seq;
555 }
556
557 struct xfrm_dump_info {
558 struct sk_buff *in_skb;
559 struct sk_buff *out_skb;
560 u32 nlmsg_seq;
561 u16 nlmsg_flags;
562 int start_idx;
563 int this_idx;
564 };
565
566 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
567 {
568 struct xfrm_dump_info *sp = ptr;
569 struct sk_buff *in_skb = sp->in_skb;
570 struct sk_buff *skb = sp->out_skb;
571 struct xfrm_usersa_info *p;
572 struct nlmsghdr *nlh;
573 unsigned char *b = skb->tail;
574
575 if (sp->this_idx < sp->start_idx)
576 goto out;
577
578 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
579 sp->nlmsg_seq,
580 XFRM_MSG_NEWSA, sizeof(*p));
581 nlh->nlmsg_flags = sp->nlmsg_flags;
582
583 p = NLMSG_DATA(nlh);
584 copy_to_user_state(x, p);
585
586 if (x->aalg)
587 RTA_PUT(skb, XFRMA_ALG_AUTH,
588 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
589 if (x->ealg)
590 RTA_PUT(skb, XFRMA_ALG_CRYPT,
591 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
592 if (x->calg)
593 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
594
595 if (x->encap)
596 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
597
598 if (x->security) {
599 int ctx_size = sizeof(struct xfrm_sec_ctx) +
600 x->security->ctx_len;
601 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
602 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
603
604 uctx->exttype = XFRMA_SEC_CTX;
605 uctx->len = ctx_size;
606 uctx->ctx_doi = x->security->ctx_doi;
607 uctx->ctx_alg = x->security->ctx_alg;
608 uctx->ctx_len = x->security->ctx_len;
609 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
610 }
611
612 if (x->coaddr)
613 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
614
615 if (x->lastused)
616 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
617
618 nlh->nlmsg_len = skb->tail - b;
619 out:
620 sp->this_idx++;
621 return 0;
622
623 nlmsg_failure:
624 rtattr_failure:
625 skb_trim(skb, b - skb->data);
626 return -1;
627 }
628
629 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
630 {
631 struct xfrm_dump_info info;
632
633 info.in_skb = cb->skb;
634 info.out_skb = skb;
635 info.nlmsg_seq = cb->nlh->nlmsg_seq;
636 info.nlmsg_flags = NLM_F_MULTI;
637 info.this_idx = 0;
638 info.start_idx = cb->args[0];
639 (void) xfrm_state_walk(0, dump_one_state, &info);
640 cb->args[0] = info.this_idx;
641
642 return skb->len;
643 }
644
645 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
646 struct xfrm_state *x, u32 seq)
647 {
648 struct xfrm_dump_info info;
649 struct sk_buff *skb;
650
651 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
652 if (!skb)
653 return ERR_PTR(-ENOMEM);
654
655 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
656 info.in_skb = in_skb;
657 info.out_skb = skb;
658 info.nlmsg_seq = seq;
659 info.nlmsg_flags = 0;
660 info.this_idx = info.start_idx = 0;
661
662 if (dump_one_state(x, 0, &info)) {
663 kfree_skb(skb);
664 return NULL;
665 }
666
667 return skb;
668 }
669
670 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
671 {
672 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
673 struct xfrm_state *x;
674 struct sk_buff *resp_skb;
675 int err = -ESRCH;
676
677 x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
678 if (x == NULL)
679 goto out_noput;
680
681 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
682 if (IS_ERR(resp_skb)) {
683 err = PTR_ERR(resp_skb);
684 } else {
685 err = netlink_unicast(xfrm_nl, resp_skb,
686 NETLINK_CB(skb).pid, MSG_DONTWAIT);
687 }
688 xfrm_state_put(x);
689 out_noput:
690 return err;
691 }
692
693 static int verify_userspi_info(struct xfrm_userspi_info *p)
694 {
695 switch (p->info.id.proto) {
696 case IPPROTO_AH:
697 case IPPROTO_ESP:
698 break;
699
700 case IPPROTO_COMP:
701 /* IPCOMP spi is 16-bits. */
702 if (p->max >= 0x10000)
703 return -EINVAL;
704 break;
705
706 default:
707 return -EINVAL;
708 };
709
710 if (p->min > p->max)
711 return -EINVAL;
712
713 return 0;
714 }
715
716 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
717 {
718 struct xfrm_state *x;
719 struct xfrm_userspi_info *p;
720 struct sk_buff *resp_skb;
721 xfrm_address_t *daddr;
722 int family;
723 int err;
724
725 p = NLMSG_DATA(nlh);
726 err = verify_userspi_info(p);
727 if (err)
728 goto out_noput;
729
730 family = p->info.family;
731 daddr = &p->info.id.daddr;
732
733 x = NULL;
734 if (p->info.seq) {
735 x = xfrm_find_acq_byseq(p->info.seq);
736 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
737 xfrm_state_put(x);
738 x = NULL;
739 }
740 }
741
742 if (!x)
743 x = xfrm_find_acq(p->info.mode, p->info.reqid,
744 p->info.id.proto, daddr,
745 &p->info.saddr, 1,
746 family);
747 err = -ENOENT;
748 if (x == NULL)
749 goto out_noput;
750
751 resp_skb = ERR_PTR(-ENOENT);
752
753 spin_lock_bh(&x->lock);
754 if (x->km.state != XFRM_STATE_DEAD) {
755 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
756 if (x->id.spi)
757 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
758 }
759 spin_unlock_bh(&x->lock);
760
761 if (IS_ERR(resp_skb)) {
762 err = PTR_ERR(resp_skb);
763 goto out;
764 }
765
766 err = netlink_unicast(xfrm_nl, resp_skb,
767 NETLINK_CB(skb).pid, MSG_DONTWAIT);
768
769 out:
770 xfrm_state_put(x);
771 out_noput:
772 return err;
773 }
774
775 static int verify_policy_dir(__u8 dir)
776 {
777 switch (dir) {
778 case XFRM_POLICY_IN:
779 case XFRM_POLICY_OUT:
780 case XFRM_POLICY_FWD:
781 break;
782
783 default:
784 return -EINVAL;
785 };
786
787 return 0;
788 }
789
790 static int verify_policy_type(__u8 type)
791 {
792 switch (type) {
793 case XFRM_POLICY_TYPE_MAIN:
794 #ifdef CONFIG_XFRM_SUB_POLICY
795 case XFRM_POLICY_TYPE_SUB:
796 #endif
797 break;
798
799 default:
800 return -EINVAL;
801 };
802
803 return 0;
804 }
805
806 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
807 {
808 switch (p->share) {
809 case XFRM_SHARE_ANY:
810 case XFRM_SHARE_SESSION:
811 case XFRM_SHARE_USER:
812 case XFRM_SHARE_UNIQUE:
813 break;
814
815 default:
816 return -EINVAL;
817 };
818
819 switch (p->action) {
820 case XFRM_POLICY_ALLOW:
821 case XFRM_POLICY_BLOCK:
822 break;
823
824 default:
825 return -EINVAL;
826 };
827
828 switch (p->sel.family) {
829 case AF_INET:
830 break;
831
832 case AF_INET6:
833 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
834 break;
835 #else
836 return -EAFNOSUPPORT;
837 #endif
838
839 default:
840 return -EINVAL;
841 };
842
843 return verify_policy_dir(p->dir);
844 }
845
846 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
847 {
848 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
849 struct xfrm_user_sec_ctx *uctx;
850
851 if (!rt)
852 return 0;
853
854 uctx = RTA_DATA(rt);
855 return security_xfrm_policy_alloc(pol, uctx);
856 }
857
858 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
859 int nr)
860 {
861 int i;
862
863 xp->xfrm_nr = nr;
864 for (i = 0; i < nr; i++, ut++) {
865 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
866
867 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
868 memcpy(&t->saddr, &ut->saddr,
869 sizeof(xfrm_address_t));
870 t->reqid = ut->reqid;
871 t->mode = ut->mode;
872 t->share = ut->share;
873 t->optional = ut->optional;
874 t->aalgos = ut->aalgos;
875 t->ealgos = ut->ealgos;
876 t->calgos = ut->calgos;
877 }
878 }
879
880 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
881 {
882 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
883 struct xfrm_user_tmpl *utmpl;
884 int nr;
885
886 if (!rt) {
887 pol->xfrm_nr = 0;
888 } else {
889 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
890
891 if (nr > XFRM_MAX_DEPTH)
892 return -EINVAL;
893
894 copy_templates(pol, RTA_DATA(rt), nr);
895 }
896 return 0;
897 }
898
899 static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
900 {
901 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
902 struct xfrm_userpolicy_type *upt;
903 __u8 type = XFRM_POLICY_TYPE_MAIN;
904 int err;
905
906 if (rt) {
907 if (rt->rta_len < sizeof(*upt))
908 return -EINVAL;
909
910 upt = RTA_DATA(rt);
911 type = upt->type;
912 }
913
914 err = verify_policy_type(type);
915 if (err)
916 return err;
917
918 *tp = type;
919 return 0;
920 }
921
922 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
923 {
924 xp->priority = p->priority;
925 xp->index = p->index;
926 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
927 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
928 xp->action = p->action;
929 xp->flags = p->flags;
930 xp->family = p->sel.family;
931 /* XXX xp->share = p->share; */
932 }
933
934 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
935 {
936 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
937 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
938 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
939 p->priority = xp->priority;
940 p->index = xp->index;
941 p->sel.family = xp->family;
942 p->dir = dir;
943 p->action = xp->action;
944 p->flags = xp->flags;
945 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
946 }
947
948 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
949 {
950 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
951 int err;
952
953 if (!xp) {
954 *errp = -ENOMEM;
955 return NULL;
956 }
957
958 copy_from_user_policy(xp, p);
959
960 err = copy_from_user_policy_type(&xp->type, xfrma);
961 if (err)
962 goto error;
963
964 if (!(err = copy_from_user_tmpl(xp, xfrma)))
965 err = copy_from_user_sec_ctx(xp, xfrma);
966 if (err)
967 goto error;
968
969 return xp;
970 error:
971 *errp = err;
972 kfree(xp);
973 return NULL;
974 }
975
976 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
977 {
978 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
979 struct xfrm_policy *xp;
980 struct km_event c;
981 int err;
982 int excl;
983
984 err = verify_newpolicy_info(p);
985 if (err)
986 return err;
987 err = verify_sec_ctx_len((struct rtattr **)xfrma);
988 if (err)
989 return err;
990
991 xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err);
992 if (!xp)
993 return err;
994
995 /* shouldnt excl be based on nlh flags??
996 * Aha! this is anti-netlink really i.e more pfkey derived
997 * in netlink excl is a flag and you wouldnt need
998 * a type XFRM_MSG_UPDPOLICY - JHS */
999 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1000 err = xfrm_policy_insert(p->dir, xp, excl);
1001 if (err) {
1002 security_xfrm_policy_free(xp);
1003 kfree(xp);
1004 return err;
1005 }
1006
1007 c.event = nlh->nlmsg_type;
1008 c.seq = nlh->nlmsg_seq;
1009 c.pid = nlh->nlmsg_pid;
1010 km_policy_notify(xp, p->dir, &c);
1011
1012 xfrm_pol_put(xp);
1013
1014 return 0;
1015 }
1016
1017 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1018 {
1019 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1020 int i;
1021
1022 if (xp->xfrm_nr == 0)
1023 return 0;
1024
1025 for (i = 0; i < xp->xfrm_nr; i++) {
1026 struct xfrm_user_tmpl *up = &vec[i];
1027 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1028
1029 memcpy(&up->id, &kp->id, sizeof(up->id));
1030 up->family = xp->family;
1031 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1032 up->reqid = kp->reqid;
1033 up->mode = kp->mode;
1034 up->share = kp->share;
1035 up->optional = kp->optional;
1036 up->aalgos = kp->aalgos;
1037 up->ealgos = kp->ealgos;
1038 up->calgos = kp->calgos;
1039 }
1040 RTA_PUT(skb, XFRMA_TMPL,
1041 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1042 vec);
1043
1044 return 0;
1045
1046 rtattr_failure:
1047 return -1;
1048 }
1049
1050 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1051 {
1052 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1053 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1054 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1055
1056 uctx->exttype = XFRMA_SEC_CTX;
1057 uctx->len = ctx_size;
1058 uctx->ctx_doi = s->ctx_doi;
1059 uctx->ctx_alg = s->ctx_alg;
1060 uctx->ctx_len = s->ctx_len;
1061 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1062 return 0;
1063
1064 rtattr_failure:
1065 return -1;
1066 }
1067
1068 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1069 {
1070 if (x->security) {
1071 return copy_sec_ctx(x->security, skb);
1072 }
1073 return 0;
1074 }
1075
1076 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1077 {
1078 if (xp->security) {
1079 return copy_sec_ctx(xp->security, skb);
1080 }
1081 return 0;
1082 }
1083
1084 #ifdef CONFIG_XFRM_SUB_POLICY
1085 static int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
1086 {
1087 struct xfrm_userpolicy_type upt;
1088
1089 memset(&upt, 0, sizeof(upt));
1090 upt.type = xp->type;
1091
1092 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1093
1094 return 0;
1095
1096 rtattr_failure:
1097 return -1;
1098 }
1099
1100 #else
1101 static inline int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
1102 {
1103 return 0;
1104 }
1105 #endif
1106
1107 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1108 {
1109 struct xfrm_dump_info *sp = ptr;
1110 struct xfrm_userpolicy_info *p;
1111 struct sk_buff *in_skb = sp->in_skb;
1112 struct sk_buff *skb = sp->out_skb;
1113 struct nlmsghdr *nlh;
1114 unsigned char *b = skb->tail;
1115
1116 if (sp->this_idx < sp->start_idx)
1117 goto out;
1118
1119 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1120 sp->nlmsg_seq,
1121 XFRM_MSG_NEWPOLICY, sizeof(*p));
1122 p = NLMSG_DATA(nlh);
1123 nlh->nlmsg_flags = sp->nlmsg_flags;
1124
1125 copy_to_user_policy(xp, p, dir);
1126 if (copy_to_user_tmpl(xp, skb) < 0)
1127 goto nlmsg_failure;
1128 if (copy_to_user_sec_ctx(xp, skb))
1129 goto nlmsg_failure;
1130 if (copy_to_user_policy_type(xp, skb) < 0)
1131 goto nlmsg_failure;
1132
1133 nlh->nlmsg_len = skb->tail - b;
1134 out:
1135 sp->this_idx++;
1136 return 0;
1137
1138 nlmsg_failure:
1139 skb_trim(skb, b - skb->data);
1140 return -1;
1141 }
1142
1143 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1144 {
1145 struct xfrm_dump_info info;
1146
1147 info.in_skb = cb->skb;
1148 info.out_skb = skb;
1149 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1150 info.nlmsg_flags = NLM_F_MULTI;
1151 info.this_idx = 0;
1152 info.start_idx = cb->args[0];
1153 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1154 #ifdef CONFIG_XFRM_SUB_POLICY
1155 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1156 #endif
1157 cb->args[0] = info.this_idx;
1158
1159 return skb->len;
1160 }
1161
1162 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1163 struct xfrm_policy *xp,
1164 int dir, u32 seq)
1165 {
1166 struct xfrm_dump_info info;
1167 struct sk_buff *skb;
1168
1169 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1170 if (!skb)
1171 return ERR_PTR(-ENOMEM);
1172
1173 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
1174 info.in_skb = in_skb;
1175 info.out_skb = skb;
1176 info.nlmsg_seq = seq;
1177 info.nlmsg_flags = 0;
1178 info.this_idx = info.start_idx = 0;
1179
1180 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1181 kfree_skb(skb);
1182 return NULL;
1183 }
1184
1185 return skb;
1186 }
1187
1188 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1189 {
1190 struct xfrm_policy *xp;
1191 struct xfrm_userpolicy_id *p;
1192 __u8 type = XFRM_POLICY_TYPE_MAIN;
1193 int err;
1194 struct km_event c;
1195 int delete;
1196
1197 p = NLMSG_DATA(nlh);
1198 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1199
1200 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1201 if (err)
1202 return err;
1203
1204 err = verify_policy_dir(p->dir);
1205 if (err)
1206 return err;
1207
1208 if (p->index)
1209 xp = xfrm_policy_byid(type, p->dir, p->index, delete);
1210 else {
1211 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1212 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1213 struct xfrm_policy tmp;
1214
1215 err = verify_sec_ctx_len(rtattrs);
1216 if (err)
1217 return err;
1218
1219 memset(&tmp, 0, sizeof(struct xfrm_policy));
1220 if (rt) {
1221 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1222
1223 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1224 return err;
1225 }
1226 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
1227 security_xfrm_policy_free(&tmp);
1228 }
1229 if (xp == NULL)
1230 return -ENOENT;
1231
1232 if (!delete) {
1233 struct sk_buff *resp_skb;
1234
1235 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1236 if (IS_ERR(resp_skb)) {
1237 err = PTR_ERR(resp_skb);
1238 } else {
1239 err = netlink_unicast(xfrm_nl, resp_skb,
1240 NETLINK_CB(skb).pid,
1241 MSG_DONTWAIT);
1242 }
1243 } else {
1244 if ((err = security_xfrm_policy_delete(xp)) != 0)
1245 goto out;
1246 c.data.byid = p->index;
1247 c.event = nlh->nlmsg_type;
1248 c.seq = nlh->nlmsg_seq;
1249 c.pid = nlh->nlmsg_pid;
1250 km_policy_notify(xp, p->dir, &c);
1251 }
1252
1253 xfrm_pol_put(xp);
1254
1255 out:
1256 return err;
1257 }
1258
1259 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1260 {
1261 struct km_event c;
1262 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1263
1264 xfrm_state_flush(p->proto);
1265 c.data.proto = p->proto;
1266 c.event = nlh->nlmsg_type;
1267 c.seq = nlh->nlmsg_seq;
1268 c.pid = nlh->nlmsg_pid;
1269 km_state_notify(NULL, &c);
1270
1271 return 0;
1272 }
1273
1274
1275 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1276 {
1277 struct xfrm_aevent_id *id;
1278 struct nlmsghdr *nlh;
1279 struct xfrm_lifetime_cur ltime;
1280 unsigned char *b = skb->tail;
1281
1282 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1283 id = NLMSG_DATA(nlh);
1284 nlh->nlmsg_flags = 0;
1285
1286 id->sa_id.daddr = x->id.daddr;
1287 id->sa_id.spi = x->id.spi;
1288 id->sa_id.family = x->props.family;
1289 id->sa_id.proto = x->id.proto;
1290 id->flags = c->data.aevent;
1291
1292 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1293
1294 ltime.bytes = x->curlft.bytes;
1295 ltime.packets = x->curlft.packets;
1296 ltime.add_time = x->curlft.add_time;
1297 ltime.use_time = x->curlft.use_time;
1298
1299 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1300
1301 if (id->flags&XFRM_AE_RTHR) {
1302 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1303 }
1304
1305 if (id->flags&XFRM_AE_ETHR) {
1306 u32 etimer = x->replay_maxage*10/HZ;
1307 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1308 }
1309
1310 nlh->nlmsg_len = skb->tail - b;
1311 return skb->len;
1312
1313 rtattr_failure:
1314 nlmsg_failure:
1315 skb_trim(skb, b - skb->data);
1316 return -1;
1317 }
1318
1319 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1320 {
1321 struct xfrm_state *x;
1322 struct sk_buff *r_skb;
1323 int err;
1324 struct km_event c;
1325 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1326 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1327 struct xfrm_usersa_id *id = &p->sa_id;
1328
1329 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1330 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1331
1332 if (p->flags&XFRM_AE_RTHR)
1333 len+=RTA_SPACE(sizeof(u32));
1334
1335 if (p->flags&XFRM_AE_ETHR)
1336 len+=RTA_SPACE(sizeof(u32));
1337
1338 r_skb = alloc_skb(len, GFP_ATOMIC);
1339 if (r_skb == NULL)
1340 return -ENOMEM;
1341
1342 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1343 if (x == NULL) {
1344 kfree(r_skb);
1345 return -ESRCH;
1346 }
1347
1348 /*
1349 * XXX: is this lock really needed - none of the other
1350 * gets lock (the concern is things getting updated
1351 * while we are still reading) - jhs
1352 */
1353 spin_lock_bh(&x->lock);
1354 c.data.aevent = p->flags;
1355 c.seq = nlh->nlmsg_seq;
1356 c.pid = nlh->nlmsg_pid;
1357
1358 if (build_aevent(r_skb, x, &c) < 0)
1359 BUG();
1360 err = netlink_unicast(xfrm_nl, r_skb,
1361 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1362 spin_unlock_bh(&x->lock);
1363 xfrm_state_put(x);
1364 return err;
1365 }
1366
1367 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1368 {
1369 struct xfrm_state *x;
1370 struct km_event c;
1371 int err = - EINVAL;
1372 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1373 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1374 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1375
1376 if (!lt && !rp)
1377 return err;
1378
1379 /* pedantic mode - thou shalt sayeth replaceth */
1380 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1381 return err;
1382
1383 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1384 if (x == NULL)
1385 return -ESRCH;
1386
1387 if (x->km.state != XFRM_STATE_VALID)
1388 goto out;
1389
1390 spin_lock_bh(&x->lock);
1391 err = xfrm_update_ae_params(x,(struct rtattr **)xfrma);
1392 spin_unlock_bh(&x->lock);
1393 if (err < 0)
1394 goto out;
1395
1396 c.event = nlh->nlmsg_type;
1397 c.seq = nlh->nlmsg_seq;
1398 c.pid = nlh->nlmsg_pid;
1399 c.data.aevent = XFRM_AE_CU;
1400 km_state_notify(x, &c);
1401 err = 0;
1402 out:
1403 xfrm_state_put(x);
1404 return err;
1405 }
1406
1407 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1408 {
1409 struct km_event c;
1410 __u8 type = XFRM_POLICY_TYPE_MAIN;
1411 int err;
1412
1413 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1414 if (err)
1415 return err;
1416
1417 xfrm_policy_flush(type);
1418 c.data.type = type;
1419 c.event = nlh->nlmsg_type;
1420 c.seq = nlh->nlmsg_seq;
1421 c.pid = nlh->nlmsg_pid;
1422 km_policy_notify(NULL, 0, &c);
1423 return 0;
1424 }
1425
1426 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1427 {
1428 struct xfrm_policy *xp;
1429 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1430 struct xfrm_userpolicy_info *p = &up->pol;
1431 __u8 type = XFRM_POLICY_TYPE_MAIN;
1432 int err = -ENOENT;
1433
1434 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1435 if (err)
1436 return err;
1437
1438 if (p->index)
1439 xp = xfrm_policy_byid(type, p->dir, p->index, 0);
1440 else {
1441 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1442 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1443 struct xfrm_policy tmp;
1444
1445 err = verify_sec_ctx_len(rtattrs);
1446 if (err)
1447 return err;
1448
1449 memset(&tmp, 0, sizeof(struct xfrm_policy));
1450 if (rt) {
1451 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1452
1453 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1454 return err;
1455 }
1456 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0);
1457 security_xfrm_policy_free(&tmp);
1458 }
1459
1460 if (xp == NULL)
1461 return err;
1462 read_lock(&xp->lock);
1463 if (xp->dead) {
1464 read_unlock(&xp->lock);
1465 goto out;
1466 }
1467
1468 read_unlock(&xp->lock);
1469 err = 0;
1470 if (up->hard) {
1471 xfrm_policy_delete(xp, p->dir);
1472 } else {
1473 // reset the timers here?
1474 printk("Dont know what to do with soft policy expire\n");
1475 }
1476 km_policy_expired(xp, p->dir, up->hard, current->pid);
1477
1478 out:
1479 xfrm_pol_put(xp);
1480 return err;
1481 }
1482
1483 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1484 {
1485 struct xfrm_state *x;
1486 int err;
1487 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1488 struct xfrm_usersa_info *p = &ue->state;
1489
1490 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1491 err = -ENOENT;
1492
1493 if (x == NULL)
1494 return err;
1495
1496 err = -EINVAL;
1497
1498 spin_lock_bh(&x->lock);
1499 if (x->km.state != XFRM_STATE_VALID)
1500 goto out;
1501 km_state_expired(x, ue->hard, current->pid);
1502
1503 if (ue->hard)
1504 __xfrm_state_delete(x);
1505 out:
1506 spin_unlock_bh(&x->lock);
1507 xfrm_state_put(x);
1508 return err;
1509 }
1510
1511 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1512 {
1513 struct xfrm_policy *xp;
1514 struct xfrm_user_tmpl *ut;
1515 int i;
1516 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1517
1518 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1519 struct xfrm_state *x = xfrm_state_alloc();
1520 int err = -ENOMEM;
1521
1522 if (!x)
1523 return err;
1524
1525 err = verify_newpolicy_info(&ua->policy);
1526 if (err) {
1527 printk("BAD policy passed\n");
1528 kfree(x);
1529 return err;
1530 }
1531
1532 /* build an XP */
1533 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) {
1534 kfree(x);
1535 return err;
1536 }
1537
1538 memcpy(&x->id, &ua->id, sizeof(ua->id));
1539 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1540 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1541
1542 ut = RTA_DATA(rt);
1543 /* extract the templates and for each call km_key */
1544 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1545 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1546 memcpy(&x->id, &t->id, sizeof(x->id));
1547 x->props.mode = t->mode;
1548 x->props.reqid = t->reqid;
1549 x->props.family = ut->family;
1550 t->aalgos = ua->aalgos;
1551 t->ealgos = ua->ealgos;
1552 t->calgos = ua->calgos;
1553 err = km_query(x, t, xp);
1554
1555 }
1556
1557 kfree(x);
1558 kfree(xp);
1559
1560 return 0;
1561 }
1562
1563
1564 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1565
1566 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1567 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1568 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1569 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1570 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1571 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1572 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1573 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1574 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1575 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1576 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1577 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1578 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1579 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1580 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1581 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1582 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1583 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1584 };
1585
1586 #undef XMSGSIZE
1587
1588 static struct xfrm_link {
1589 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
1590 int (*dump)(struct sk_buff *, struct netlink_callback *);
1591 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1592 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1593 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1594 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1595 .dump = xfrm_dump_sa },
1596 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1597 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1598 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1599 .dump = xfrm_dump_policy },
1600 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1601 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1602 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1603 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1604 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1605 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1606 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1607 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1608 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1609 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1610 };
1611
1612 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
1613 {
1614 struct rtattr *xfrma[XFRMA_MAX];
1615 struct xfrm_link *link;
1616 int type, min_len;
1617
1618 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
1619 return 0;
1620
1621 type = nlh->nlmsg_type;
1622
1623 /* A control message: ignore them */
1624 if (type < XFRM_MSG_BASE)
1625 return 0;
1626
1627 /* Unknown message: reply with EINVAL */
1628 if (type > XFRM_MSG_MAX)
1629 goto err_einval;
1630
1631 type -= XFRM_MSG_BASE;
1632 link = &xfrm_dispatch[type];
1633
1634 /* All operations require privileges, even GET */
1635 if (security_netlink_recv(skb, CAP_NET_ADMIN)) {
1636 *errp = -EPERM;
1637 return -1;
1638 }
1639
1640 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1641 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1642 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1643 if (link->dump == NULL)
1644 goto err_einval;
1645
1646 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
1647 link->dump, NULL)) != 0) {
1648 return -1;
1649 }
1650
1651 netlink_queue_skip(nlh, skb);
1652 return -1;
1653 }
1654
1655 memset(xfrma, 0, sizeof(xfrma));
1656
1657 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1658 goto err_einval;
1659
1660 if (nlh->nlmsg_len > min_len) {
1661 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1662 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1663
1664 while (RTA_OK(attr, attrlen)) {
1665 unsigned short flavor = attr->rta_type;
1666 if (flavor) {
1667 if (flavor > XFRMA_MAX)
1668 goto err_einval;
1669 xfrma[flavor - 1] = attr;
1670 }
1671 attr = RTA_NEXT(attr, attrlen);
1672 }
1673 }
1674
1675 if (link->doit == NULL)
1676 goto err_einval;
1677 *errp = link->doit(skb, nlh, (void **) &xfrma);
1678
1679 return *errp;
1680
1681 err_einval:
1682 *errp = -EINVAL;
1683 return -1;
1684 }
1685
1686 static void xfrm_netlink_rcv(struct sock *sk, int len)
1687 {
1688 unsigned int qlen = 0;
1689
1690 do {
1691 mutex_lock(&xfrm_cfg_mutex);
1692 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
1693 mutex_unlock(&xfrm_cfg_mutex);
1694
1695 } while (qlen);
1696 }
1697
1698 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1699 {
1700 struct xfrm_user_expire *ue;
1701 struct nlmsghdr *nlh;
1702 unsigned char *b = skb->tail;
1703
1704 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1705 sizeof(*ue));
1706 ue = NLMSG_DATA(nlh);
1707 nlh->nlmsg_flags = 0;
1708
1709 copy_to_user_state(x, &ue->state);
1710 ue->hard = (c->data.hard != 0) ? 1 : 0;
1711
1712 nlh->nlmsg_len = skb->tail - b;
1713 return skb->len;
1714
1715 nlmsg_failure:
1716 skb_trim(skb, b - skb->data);
1717 return -1;
1718 }
1719
1720 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1721 {
1722 struct sk_buff *skb;
1723 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1724
1725 skb = alloc_skb(len, GFP_ATOMIC);
1726 if (skb == NULL)
1727 return -ENOMEM;
1728
1729 if (build_expire(skb, x, c) < 0)
1730 BUG();
1731
1732 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1733 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1734 }
1735
1736 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1737 {
1738 struct sk_buff *skb;
1739 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1740
1741 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1742 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1743 skb = alloc_skb(len, GFP_ATOMIC);
1744 if (skb == NULL)
1745 return -ENOMEM;
1746
1747 if (build_aevent(skb, x, c) < 0)
1748 BUG();
1749
1750 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
1751 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1752 }
1753
1754 static int xfrm_notify_sa_flush(struct km_event *c)
1755 {
1756 struct xfrm_usersa_flush *p;
1757 struct nlmsghdr *nlh;
1758 struct sk_buff *skb;
1759 unsigned char *b;
1760 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1761
1762 skb = alloc_skb(len, GFP_ATOMIC);
1763 if (skb == NULL)
1764 return -ENOMEM;
1765 b = skb->tail;
1766
1767 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1768 XFRM_MSG_FLUSHSA, sizeof(*p));
1769 nlh->nlmsg_flags = 0;
1770
1771 p = NLMSG_DATA(nlh);
1772 p->proto = c->data.proto;
1773
1774 nlh->nlmsg_len = skb->tail - b;
1775
1776 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1777 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1778
1779 nlmsg_failure:
1780 kfree_skb(skb);
1781 return -1;
1782 }
1783
1784 static int inline xfrm_sa_len(struct xfrm_state *x)
1785 {
1786 int l = 0;
1787 if (x->aalg)
1788 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1789 if (x->ealg)
1790 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1791 if (x->calg)
1792 l += RTA_SPACE(sizeof(*x->calg));
1793 if (x->encap)
1794 l += RTA_SPACE(sizeof(*x->encap));
1795
1796 return l;
1797 }
1798
1799 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1800 {
1801 struct xfrm_usersa_info *p;
1802 struct xfrm_usersa_id *id;
1803 struct nlmsghdr *nlh;
1804 struct sk_buff *skb;
1805 unsigned char *b;
1806 int len = xfrm_sa_len(x);
1807 int headlen;
1808
1809 headlen = sizeof(*p);
1810 if (c->event == XFRM_MSG_DELSA) {
1811 len += RTA_SPACE(headlen);
1812 headlen = sizeof(*id);
1813 }
1814 len += NLMSG_SPACE(headlen);
1815
1816 skb = alloc_skb(len, GFP_ATOMIC);
1817 if (skb == NULL)
1818 return -ENOMEM;
1819 b = skb->tail;
1820
1821 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1822 nlh->nlmsg_flags = 0;
1823
1824 p = NLMSG_DATA(nlh);
1825 if (c->event == XFRM_MSG_DELSA) {
1826 id = NLMSG_DATA(nlh);
1827 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1828 id->spi = x->id.spi;
1829 id->family = x->props.family;
1830 id->proto = x->id.proto;
1831
1832 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1833 }
1834
1835 copy_to_user_state(x, p);
1836
1837 if (x->aalg)
1838 RTA_PUT(skb, XFRMA_ALG_AUTH,
1839 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1840 if (x->ealg)
1841 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1842 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1843 if (x->calg)
1844 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1845
1846 if (x->encap)
1847 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1848
1849 nlh->nlmsg_len = skb->tail - b;
1850
1851 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1852 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1853
1854 nlmsg_failure:
1855 rtattr_failure:
1856 kfree_skb(skb);
1857 return -1;
1858 }
1859
1860 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1861 {
1862
1863 switch (c->event) {
1864 case XFRM_MSG_EXPIRE:
1865 return xfrm_exp_state_notify(x, c);
1866 case XFRM_MSG_NEWAE:
1867 return xfrm_aevent_state_notify(x, c);
1868 case XFRM_MSG_DELSA:
1869 case XFRM_MSG_UPDSA:
1870 case XFRM_MSG_NEWSA:
1871 return xfrm_notify_sa(x, c);
1872 case XFRM_MSG_FLUSHSA:
1873 return xfrm_notify_sa_flush(c);
1874 default:
1875 printk("xfrm_user: Unknown SA event %d\n", c->event);
1876 break;
1877 }
1878
1879 return 0;
1880
1881 }
1882
1883 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1884 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1885 int dir)
1886 {
1887 struct xfrm_user_acquire *ua;
1888 struct nlmsghdr *nlh;
1889 unsigned char *b = skb->tail;
1890 __u32 seq = xfrm_get_acqseq();
1891
1892 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1893 sizeof(*ua));
1894 ua = NLMSG_DATA(nlh);
1895 nlh->nlmsg_flags = 0;
1896
1897 memcpy(&ua->id, &x->id, sizeof(ua->id));
1898 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1899 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1900 copy_to_user_policy(xp, &ua->policy, dir);
1901 ua->aalgos = xt->aalgos;
1902 ua->ealgos = xt->ealgos;
1903 ua->calgos = xt->calgos;
1904 ua->seq = x->km.seq = seq;
1905
1906 if (copy_to_user_tmpl(xp, skb) < 0)
1907 goto nlmsg_failure;
1908 if (copy_to_user_state_sec_ctx(x, skb))
1909 goto nlmsg_failure;
1910 if (copy_to_user_policy_type(xp, skb) < 0)
1911 goto nlmsg_failure;
1912
1913 nlh->nlmsg_len = skb->tail - b;
1914 return skb->len;
1915
1916 nlmsg_failure:
1917 skb_trim(skb, b - skb->data);
1918 return -1;
1919 }
1920
1921 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1922 struct xfrm_policy *xp, int dir)
1923 {
1924 struct sk_buff *skb;
1925 size_t len;
1926
1927 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1928 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1929 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
1930 skb = alloc_skb(len, GFP_ATOMIC);
1931 if (skb == NULL)
1932 return -ENOMEM;
1933
1934 if (build_acquire(skb, x, xt, xp, dir) < 0)
1935 BUG();
1936
1937 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
1938 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1939 }
1940
1941 /* User gives us xfrm_user_policy_info followed by an array of 0
1942 * or more templates.
1943 */
1944 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1945 u8 *data, int len, int *dir)
1946 {
1947 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1948 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1949 struct xfrm_policy *xp;
1950 int nr;
1951
1952 switch (sk->sk_family) {
1953 case AF_INET:
1954 if (opt != IP_XFRM_POLICY) {
1955 *dir = -EOPNOTSUPP;
1956 return NULL;
1957 }
1958 break;
1959 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1960 case AF_INET6:
1961 if (opt != IPV6_XFRM_POLICY) {
1962 *dir = -EOPNOTSUPP;
1963 return NULL;
1964 }
1965 break;
1966 #endif
1967 default:
1968 *dir = -EINVAL;
1969 return NULL;
1970 }
1971
1972 *dir = -EINVAL;
1973
1974 if (len < sizeof(*p) ||
1975 verify_newpolicy_info(p))
1976 return NULL;
1977
1978 nr = ((len - sizeof(*p)) / sizeof(*ut));
1979 if (nr > XFRM_MAX_DEPTH)
1980 return NULL;
1981
1982 if (p->dir > XFRM_POLICY_OUT)
1983 return NULL;
1984
1985 xp = xfrm_policy_alloc(GFP_KERNEL);
1986 if (xp == NULL) {
1987 *dir = -ENOBUFS;
1988 return NULL;
1989 }
1990
1991 copy_from_user_policy(xp, p);
1992 xp->type = XFRM_POLICY_TYPE_MAIN;
1993 copy_templates(xp, ut, nr);
1994
1995 if (!xp->security) {
1996 int err = security_xfrm_sock_policy_alloc(xp, sk);
1997 if (err) {
1998 kfree(xp);
1999 *dir = err;
2000 return NULL;
2001 }
2002 }
2003
2004 *dir = p->dir;
2005
2006 return xp;
2007 }
2008
2009 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2010 int dir, struct km_event *c)
2011 {
2012 struct xfrm_user_polexpire *upe;
2013 struct nlmsghdr *nlh;
2014 int hard = c->data.hard;
2015 unsigned char *b = skb->tail;
2016
2017 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
2018 upe = NLMSG_DATA(nlh);
2019 nlh->nlmsg_flags = 0;
2020
2021 copy_to_user_policy(xp, &upe->pol, dir);
2022 if (copy_to_user_tmpl(xp, skb) < 0)
2023 goto nlmsg_failure;
2024 if (copy_to_user_sec_ctx(xp, skb))
2025 goto nlmsg_failure;
2026 if (copy_to_user_policy_type(xp, skb) < 0)
2027 goto nlmsg_failure;
2028 upe->hard = !!hard;
2029
2030 nlh->nlmsg_len = skb->tail - b;
2031 return skb->len;
2032
2033 nlmsg_failure:
2034 skb_trim(skb, b - skb->data);
2035 return -1;
2036 }
2037
2038 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2039 {
2040 struct sk_buff *skb;
2041 size_t len;
2042
2043 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2044 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2045 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
2046 skb = alloc_skb(len, GFP_ATOMIC);
2047 if (skb == NULL)
2048 return -ENOMEM;
2049
2050 if (build_polexpire(skb, xp, dir, c) < 0)
2051 BUG();
2052
2053 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2054 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2055 }
2056
2057 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2058 {
2059 struct xfrm_userpolicy_info *p;
2060 struct xfrm_userpolicy_id *id;
2061 struct nlmsghdr *nlh;
2062 struct sk_buff *skb;
2063 unsigned char *b;
2064 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2065 int headlen;
2066
2067 headlen = sizeof(*p);
2068 if (c->event == XFRM_MSG_DELPOLICY) {
2069 len += RTA_SPACE(headlen);
2070 headlen = sizeof(*id);
2071 }
2072 len += NLMSG_SPACE(headlen);
2073
2074 skb = alloc_skb(len, GFP_ATOMIC);
2075 if (skb == NULL)
2076 return -ENOMEM;
2077 b = skb->tail;
2078
2079 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2080
2081 p = NLMSG_DATA(nlh);
2082 if (c->event == XFRM_MSG_DELPOLICY) {
2083 id = NLMSG_DATA(nlh);
2084 memset(id, 0, sizeof(*id));
2085 id->dir = dir;
2086 if (c->data.byid)
2087 id->index = xp->index;
2088 else
2089 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2090
2091 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2092 }
2093
2094 nlh->nlmsg_flags = 0;
2095
2096 copy_to_user_policy(xp, p, dir);
2097 if (copy_to_user_tmpl(xp, skb) < 0)
2098 goto nlmsg_failure;
2099 if (copy_to_user_policy_type(xp, skb) < 0)
2100 goto nlmsg_failure;
2101
2102 nlh->nlmsg_len = skb->tail - b;
2103
2104 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2105 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2106
2107 nlmsg_failure:
2108 rtattr_failure:
2109 kfree_skb(skb);
2110 return -1;
2111 }
2112
2113 static int xfrm_notify_policy_flush(struct km_event *c)
2114 {
2115 struct nlmsghdr *nlh;
2116 struct sk_buff *skb;
2117 unsigned char *b;
2118 #ifdef CONFIG_XFRM_SUB_POLICY
2119 struct xfrm_userpolicy_type upt;
2120 #endif
2121 int len = NLMSG_LENGTH(0);
2122
2123 skb = alloc_skb(len, GFP_ATOMIC);
2124 if (skb == NULL)
2125 return -ENOMEM;
2126 b = skb->tail;
2127
2128
2129 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2130 nlh->nlmsg_flags = 0;
2131
2132 #ifdef CONFIG_XFRM_SUB_POLICY
2133 memset(&upt, 0, sizeof(upt));
2134 upt.type = c->data.type;
2135 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2136 #endif
2137
2138 nlh->nlmsg_len = skb->tail - b;
2139
2140 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2141 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2142
2143 nlmsg_failure:
2144 #ifdef CONFIG_XFRM_SUB_POLICY
2145 rtattr_failure:
2146 #endif
2147 kfree_skb(skb);
2148 return -1;
2149 }
2150
2151 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2152 {
2153
2154 switch (c->event) {
2155 case XFRM_MSG_NEWPOLICY:
2156 case XFRM_MSG_UPDPOLICY:
2157 case XFRM_MSG_DELPOLICY:
2158 return xfrm_notify_policy(xp, dir, c);
2159 case XFRM_MSG_FLUSHPOLICY:
2160 return xfrm_notify_policy_flush(c);
2161 case XFRM_MSG_POLEXPIRE:
2162 return xfrm_exp_policy_notify(xp, dir, c);
2163 default:
2164 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2165 }
2166
2167 return 0;
2168
2169 }
2170
2171 static int build_report(struct sk_buff *skb, u8 proto,
2172 struct xfrm_selector *sel, xfrm_address_t *addr)
2173 {
2174 struct xfrm_user_report *ur;
2175 struct nlmsghdr *nlh;
2176 unsigned char *b = skb->tail;
2177
2178 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2179 ur = NLMSG_DATA(nlh);
2180 nlh->nlmsg_flags = 0;
2181
2182 ur->proto = proto;
2183 memcpy(&ur->sel, sel, sizeof(ur->sel));
2184
2185 if (addr)
2186 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2187
2188 nlh->nlmsg_len = skb->tail - b;
2189 return skb->len;
2190
2191 nlmsg_failure:
2192 rtattr_failure:
2193 skb_trim(skb, b - skb->data);
2194 return -1;
2195 }
2196
2197 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2198 xfrm_address_t *addr)
2199 {
2200 struct sk_buff *skb;
2201 size_t len;
2202
2203 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2204 skb = alloc_skb(len, GFP_ATOMIC);
2205 if (skb == NULL)
2206 return -ENOMEM;
2207
2208 if (build_report(skb, proto, sel, addr) < 0)
2209 BUG();
2210
2211 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2212 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2213 }
2214
2215 static struct xfrm_mgr netlink_mgr = {
2216 .id = "netlink",
2217 .notify = xfrm_send_state_notify,
2218 .acquire = xfrm_send_acquire,
2219 .compile_policy = xfrm_compile_policy,
2220 .notify_policy = xfrm_send_policy_notify,
2221 .report = xfrm_send_report,
2222 };
2223
2224 static int __init xfrm_user_init(void)
2225 {
2226 struct sock *nlsk;
2227
2228 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2229
2230 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2231 xfrm_netlink_rcv, THIS_MODULE);
2232 if (nlsk == NULL)
2233 return -ENOMEM;
2234 rcu_assign_pointer(xfrm_nl, nlsk);
2235
2236 xfrm_register_km(&netlink_mgr);
2237
2238 return 0;
2239 }
2240
2241 static void __exit xfrm_user_exit(void)
2242 {
2243 struct sock *nlsk = xfrm_nl;
2244
2245 xfrm_unregister_km(&netlink_mgr);
2246 rcu_assign_pointer(xfrm_nl, NULL);
2247 synchronize_rcu();
2248 sock_release(nlsk->sk_socket);
2249 }
2250
2251 module_init(xfrm_user_init);
2252 module_exit(xfrm_user_exit);
2253 MODULE_LICENSE("GPL");
2254 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2255
Support for the Chinese Samsung S3C2440 based development boards