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USB core: fix compiler warning about usb_autosuspend_work
[linux-2.6/mini2440.git] / net / xfrm / xfrm_user.c
blob2ee14f8a1908ee6c7d54fa4e74f31a5ef89a23ca
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 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.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 err = -ESRCH;
499 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
500 p->family);
501 }
502
503 out:
504 if (!x && errp)
505 *errp = err;
506 return x;
507 }
508
509 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
510 {
511 struct xfrm_state *x;
512 int err = -ESRCH;
513 struct km_event c;
514 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
515
516 x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
517 if (x == NULL)
518 return err;
519
520 if ((err = security_xfrm_state_delete(x)) != 0)
521 goto out;
522
523 if (xfrm_state_kern(x)) {
524 err = -EPERM;
525 goto out;
526 }
527
528 err = xfrm_state_delete(x);
529 if (err < 0)
530 goto out;
531
532 c.seq = nlh->nlmsg_seq;
533 c.pid = nlh->nlmsg_pid;
534 c.event = nlh->nlmsg_type;
535 km_state_notify(x, &c);
536
537 out:
538 xfrm_state_put(x);
539 return err;
540 }
541
542 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
543 {
544 memcpy(&p->id, &x->id, sizeof(p->id));
545 memcpy(&p->sel, &x->sel, sizeof(p->sel));
546 memcpy(&p->lft, &x->lft, sizeof(p->lft));
547 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
548 memcpy(&p->stats, &x->stats, sizeof(p->stats));
549 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
550 p->mode = x->props.mode;
551 p->replay_window = x->props.replay_window;
552 p->reqid = x->props.reqid;
553 p->family = x->props.family;
554 p->flags = x->props.flags;
555 p->seq = x->km.seq;
556 }
557
558 struct xfrm_dump_info {
559 struct sk_buff *in_skb;
560 struct sk_buff *out_skb;
561 u32 nlmsg_seq;
562 u16 nlmsg_flags;
563 int start_idx;
564 int this_idx;
565 };
566
567 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
568 {
569 struct xfrm_dump_info *sp = ptr;
570 struct sk_buff *in_skb = sp->in_skb;
571 struct sk_buff *skb = sp->out_skb;
572 struct xfrm_usersa_info *p;
573 struct nlmsghdr *nlh;
574 unsigned char *b = skb->tail;
575
576 if (sp->this_idx < sp->start_idx)
577 goto out;
578
579 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
580 sp->nlmsg_seq,
581 XFRM_MSG_NEWSA, sizeof(*p));
582 nlh->nlmsg_flags = sp->nlmsg_flags;
583
584 p = NLMSG_DATA(nlh);
585 copy_to_user_state(x, p);
586
587 if (x->aalg)
588 RTA_PUT(skb, XFRMA_ALG_AUTH,
589 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
590 if (x->ealg)
591 RTA_PUT(skb, XFRMA_ALG_CRYPT,
592 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
593 if (x->calg)
594 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
595
596 if (x->encap)
597 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
598
599 if (x->security) {
600 int ctx_size = sizeof(struct xfrm_sec_ctx) +
601 x->security->ctx_len;
602 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
603 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
604
605 uctx->exttype = XFRMA_SEC_CTX;
606 uctx->len = ctx_size;
607 uctx->ctx_doi = x->security->ctx_doi;
608 uctx->ctx_alg = x->security->ctx_alg;
609 uctx->ctx_len = x->security->ctx_len;
610 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
611 }
612
613 if (x->coaddr)
614 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
615
616 if (x->lastused)
617 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
618
619 nlh->nlmsg_len = skb->tail - b;
620 out:
621 sp->this_idx++;
622 return 0;
623
624 nlmsg_failure:
625 rtattr_failure:
626 skb_trim(skb, b - skb->data);
627 return -1;
628 }
629
630 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
631 {
632 struct xfrm_dump_info info;
633
634 info.in_skb = cb->skb;
635 info.out_skb = skb;
636 info.nlmsg_seq = cb->nlh->nlmsg_seq;
637 info.nlmsg_flags = NLM_F_MULTI;
638 info.this_idx = 0;
639 info.start_idx = cb->args[0];
640 (void) xfrm_state_walk(0, dump_one_state, &info);
641 cb->args[0] = info.this_idx;
642
643 return skb->len;
644 }
645
646 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
647 struct xfrm_state *x, u32 seq)
648 {
649 struct xfrm_dump_info info;
650 struct sk_buff *skb;
651
652 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
653 if (!skb)
654 return ERR_PTR(-ENOMEM);
655
656 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
657 info.in_skb = in_skb;
658 info.out_skb = skb;
659 info.nlmsg_seq = seq;
660 info.nlmsg_flags = 0;
661 info.this_idx = info.start_idx = 0;
662
663 if (dump_one_state(x, 0, &info)) {
664 kfree_skb(skb);
665 return NULL;
666 }
667
668 return skb;
669 }
670
671 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
672 {
673 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
674 struct xfrm_state *x;
675 struct sk_buff *resp_skb;
676 int err = -ESRCH;
677
678 x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
679 if (x == NULL)
680 goto out_noput;
681
682 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
683 if (IS_ERR(resp_skb)) {
684 err = PTR_ERR(resp_skb);
685 } else {
686 err = netlink_unicast(xfrm_nl, resp_skb,
687 NETLINK_CB(skb).pid, MSG_DONTWAIT);
688 }
689 xfrm_state_put(x);
690 out_noput:
691 return err;
692 }
693
694 static int verify_userspi_info(struct xfrm_userspi_info *p)
695 {
696 switch (p->info.id.proto) {
697 case IPPROTO_AH:
698 case IPPROTO_ESP:
699 break;
700
701 case IPPROTO_COMP:
702 /* IPCOMP spi is 16-bits. */
703 if (p->max >= 0x10000)
704 return -EINVAL;
705 break;
706
707 default:
708 return -EINVAL;
709 };
710
711 if (p->min > p->max)
712 return -EINVAL;
713
714 return 0;
715 }
716
717 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
718 {
719 struct xfrm_state *x;
720 struct xfrm_userspi_info *p;
721 struct sk_buff *resp_skb;
722 xfrm_address_t *daddr;
723 int family;
724 int err;
725
726 p = NLMSG_DATA(nlh);
727 err = verify_userspi_info(p);
728 if (err)
729 goto out_noput;
730
731 family = p->info.family;
732 daddr = &p->info.id.daddr;
733
734 x = NULL;
735 if (p->info.seq) {
736 x = xfrm_find_acq_byseq(p->info.seq);
737 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
738 xfrm_state_put(x);
739 x = NULL;
740 }
741 }
742
743 if (!x)
744 x = xfrm_find_acq(p->info.mode, p->info.reqid,
745 p->info.id.proto, daddr,
746 &p->info.saddr, 1,
747 family);
748 err = -ENOENT;
749 if (x == NULL)
750 goto out_noput;
751
752 resp_skb = ERR_PTR(-ENOENT);
753
754 spin_lock_bh(&x->lock);
755 if (x->km.state != XFRM_STATE_DEAD) {
756 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
757 if (x->id.spi)
758 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
759 }
760 spin_unlock_bh(&x->lock);
761
762 if (IS_ERR(resp_skb)) {
763 err = PTR_ERR(resp_skb);
764 goto out;
765 }
766
767 err = netlink_unicast(xfrm_nl, resp_skb,
768 NETLINK_CB(skb).pid, MSG_DONTWAIT);
769
770 out:
771 xfrm_state_put(x);
772 out_noput:
773 return err;
774 }
775
776 static int verify_policy_dir(__u8 dir)
777 {
778 switch (dir) {
779 case XFRM_POLICY_IN:
780 case XFRM_POLICY_OUT:
781 case XFRM_POLICY_FWD:
782 break;
783
784 default:
785 return -EINVAL;
786 };
787
788 return 0;
789 }
790
791 static int verify_policy_type(__u8 type)
792 {
793 switch (type) {
794 case XFRM_POLICY_TYPE_MAIN:
795 #ifdef CONFIG_XFRM_SUB_POLICY
796 case XFRM_POLICY_TYPE_SUB:
797 #endif
798 break;
799
800 default:
801 return -EINVAL;
802 };
803
804 return 0;
805 }
806
807 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
808 {
809 switch (p->share) {
810 case XFRM_SHARE_ANY:
811 case XFRM_SHARE_SESSION:
812 case XFRM_SHARE_USER:
813 case XFRM_SHARE_UNIQUE:
814 break;
815
816 default:
817 return -EINVAL;
818 };
819
820 switch (p->action) {
821 case XFRM_POLICY_ALLOW:
822 case XFRM_POLICY_BLOCK:
823 break;
824
825 default:
826 return -EINVAL;
827 };
828
829 switch (p->sel.family) {
830 case AF_INET:
831 break;
832
833 case AF_INET6:
834 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
835 break;
836 #else
837 return -EAFNOSUPPORT;
838 #endif
839
840 default:
841 return -EINVAL;
842 };
843
844 return verify_policy_dir(p->dir);
845 }
846
847 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
848 {
849 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
850 struct xfrm_user_sec_ctx *uctx;
851
852 if (!rt)
853 return 0;
854
855 uctx = RTA_DATA(rt);
856 return security_xfrm_policy_alloc(pol, uctx);
857 }
858
859 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
860 int nr)
861 {
862 int i;
863
864 xp->xfrm_nr = nr;
865 for (i = 0; i < nr; i++, ut++) {
866 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
867
868 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
869 memcpy(&t->saddr, &ut->saddr,
870 sizeof(xfrm_address_t));
871 t->reqid = ut->reqid;
872 t->mode = ut->mode;
873 t->share = ut->share;
874 t->optional = ut->optional;
875 t->aalgos = ut->aalgos;
876 t->ealgos = ut->ealgos;
877 t->calgos = ut->calgos;
878 }
879 }
880
881 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
882 {
883 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
884 struct xfrm_user_tmpl *utmpl;
885 int nr;
886
887 if (!rt) {
888 pol->xfrm_nr = 0;
889 } else {
890 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
891
892 if (nr > XFRM_MAX_DEPTH)
893 return -EINVAL;
894
895 copy_templates(pol, RTA_DATA(rt), nr);
896 }
897 return 0;
898 }
899
900 static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
901 {
902 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
903 struct xfrm_userpolicy_type *upt;
904 __u8 type = XFRM_POLICY_TYPE_MAIN;
905 int err;
906
907 if (rt) {
908 if (rt->rta_len < sizeof(*upt))
909 return -EINVAL;
910
911 upt = RTA_DATA(rt);
912 type = upt->type;
913 }
914
915 err = verify_policy_type(type);
916 if (err)
917 return err;
918
919 *tp = type;
920 return 0;
921 }
922
923 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
924 {
925 xp->priority = p->priority;
926 xp->index = p->index;
927 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
928 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
929 xp->action = p->action;
930 xp->flags = p->flags;
931 xp->family = p->sel.family;
932 /* XXX xp->share = p->share; */
933 }
934
935 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
936 {
937 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
938 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
939 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
940 p->priority = xp->priority;
941 p->index = xp->index;
942 p->sel.family = xp->family;
943 p->dir = dir;
944 p->action = xp->action;
945 p->flags = xp->flags;
946 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
947 }
948
949 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
950 {
951 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
952 int err;
953
954 if (!xp) {
955 *errp = -ENOMEM;
956 return NULL;
957 }
958
959 copy_from_user_policy(xp, p);
960
961 err = copy_from_user_policy_type(&xp->type, xfrma);
962 if (err)
963 goto error;
964
965 if (!(err = copy_from_user_tmpl(xp, xfrma)))
966 err = copy_from_user_sec_ctx(xp, xfrma);
967 if (err)
968 goto error;
969
970 return xp;
971 error:
972 *errp = err;
973 kfree(xp);
974 return NULL;
975 }
976
977 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
978 {
979 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
980 struct xfrm_policy *xp;
981 struct km_event c;
982 int err;
983 int excl;
984
985 err = verify_newpolicy_info(p);
986 if (err)
987 return err;
988 err = verify_sec_ctx_len((struct rtattr **)xfrma);
989 if (err)
990 return err;
991
992 xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err);
993 if (!xp)
994 return err;
995
996 /* shouldnt excl be based on nlh flags??
997 * Aha! this is anti-netlink really i.e more pfkey derived
998 * in netlink excl is a flag and you wouldnt need
999 * a type XFRM_MSG_UPDPOLICY - JHS */
1000 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1001 err = xfrm_policy_insert(p->dir, xp, excl);
1002 if (err) {
1003 security_xfrm_policy_free(xp);
1004 kfree(xp);
1005 return err;
1006 }
1007
1008 c.event = nlh->nlmsg_type;
1009 c.seq = nlh->nlmsg_seq;
1010 c.pid = nlh->nlmsg_pid;
1011 km_policy_notify(xp, p->dir, &c);
1012
1013 xfrm_pol_put(xp);
1014
1015 return 0;
1016 }
1017
1018 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1019 {
1020 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1021 int i;
1022
1023 if (xp->xfrm_nr == 0)
1024 return 0;
1025
1026 for (i = 0; i < xp->xfrm_nr; i++) {
1027 struct xfrm_user_tmpl *up = &vec[i];
1028 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1029
1030 memcpy(&up->id, &kp->id, sizeof(up->id));
1031 up->family = xp->family;
1032 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1033 up->reqid = kp->reqid;
1034 up->mode = kp->mode;
1035 up->share = kp->share;
1036 up->optional = kp->optional;
1037 up->aalgos = kp->aalgos;
1038 up->ealgos = kp->ealgos;
1039 up->calgos = kp->calgos;
1040 }
1041 RTA_PUT(skb, XFRMA_TMPL,
1042 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1043 vec);
1044
1045 return 0;
1046
1047 rtattr_failure:
1048 return -1;
1049 }
1050
1051 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1052 {
1053 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1054 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1055 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1056
1057 uctx->exttype = XFRMA_SEC_CTX;
1058 uctx->len = ctx_size;
1059 uctx->ctx_doi = s->ctx_doi;
1060 uctx->ctx_alg = s->ctx_alg;
1061 uctx->ctx_len = s->ctx_len;
1062 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1063 return 0;
1064
1065 rtattr_failure:
1066 return -1;
1067 }
1068
1069 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1070 {
1071 if (x->security) {
1072 return copy_sec_ctx(x->security, skb);
1073 }
1074 return 0;
1075 }
1076
1077 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1078 {
1079 if (xp->security) {
1080 return copy_sec_ctx(xp->security, skb);
1081 }
1082 return 0;
1083 }
1084
1085 #ifdef CONFIG_XFRM_SUB_POLICY
1086 static int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
1087 {
1088 struct xfrm_userpolicy_type upt;
1089
1090 memset(&upt, 0, sizeof(upt));
1091 upt.type = xp->type;
1092
1093 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1094
1095 return 0;
1096
1097 rtattr_failure:
1098 return -1;
1099 }
1100
1101 #else
1102 static inline int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
1103 {
1104 return 0;
1105 }
1106 #endif
1107
1108 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1109 {
1110 struct xfrm_dump_info *sp = ptr;
1111 struct xfrm_userpolicy_info *p;
1112 struct sk_buff *in_skb = sp->in_skb;
1113 struct sk_buff *skb = sp->out_skb;
1114 struct nlmsghdr *nlh;
1115 unsigned char *b = skb->tail;
1116
1117 if (sp->this_idx < sp->start_idx)
1118 goto out;
1119
1120 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1121 sp->nlmsg_seq,
1122 XFRM_MSG_NEWPOLICY, sizeof(*p));
1123 p = NLMSG_DATA(nlh);
1124 nlh->nlmsg_flags = sp->nlmsg_flags;
1125
1126 copy_to_user_policy(xp, p, dir);
1127 if (copy_to_user_tmpl(xp, skb) < 0)
1128 goto nlmsg_failure;
1129 if (copy_to_user_sec_ctx(xp, skb))
1130 goto nlmsg_failure;
1131 if (copy_to_user_policy_type(xp, skb) < 0)
1132 goto nlmsg_failure;
1133
1134 nlh->nlmsg_len = skb->tail - b;
1135 out:
1136 sp->this_idx++;
1137 return 0;
1138
1139 nlmsg_failure:
1140 skb_trim(skb, b - skb->data);
1141 return -1;
1142 }
1143
1144 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1145 {
1146 struct xfrm_dump_info info;
1147
1148 info.in_skb = cb->skb;
1149 info.out_skb = skb;
1150 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1151 info.nlmsg_flags = NLM_F_MULTI;
1152 info.this_idx = 0;
1153 info.start_idx = cb->args[0];
1154 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1155 #ifdef CONFIG_XFRM_SUB_POLICY
1156 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1157 #endif
1158 cb->args[0] = info.this_idx;
1159
1160 return skb->len;
1161 }
1162
1163 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1164 struct xfrm_policy *xp,
1165 int dir, u32 seq)
1166 {
1167 struct xfrm_dump_info info;
1168 struct sk_buff *skb;
1169
1170 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1171 if (!skb)
1172 return ERR_PTR(-ENOMEM);
1173
1174 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
1175 info.in_skb = in_skb;
1176 info.out_skb = skb;
1177 info.nlmsg_seq = seq;
1178 info.nlmsg_flags = 0;
1179 info.this_idx = info.start_idx = 0;
1180
1181 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1182 kfree_skb(skb);
1183 return NULL;
1184 }
1185
1186 return skb;
1187 }
1188
1189 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1190 {
1191 struct xfrm_policy *xp;
1192 struct xfrm_userpolicy_id *p;
1193 __u8 type = XFRM_POLICY_TYPE_MAIN;
1194 int err;
1195 struct km_event c;
1196 int delete;
1197
1198 p = NLMSG_DATA(nlh);
1199 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1200
1201 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1202 if (err)
1203 return err;
1204
1205 err = verify_policy_dir(p->dir);
1206 if (err)
1207 return err;
1208
1209 if (p->index)
1210 xp = xfrm_policy_byid(type, p->dir, p->index, delete);
1211 else {
1212 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1213 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1214 struct xfrm_policy tmp;
1215
1216 err = verify_sec_ctx_len(rtattrs);
1217 if (err)
1218 return err;
1219
1220 memset(&tmp, 0, sizeof(struct xfrm_policy));
1221 if (rt) {
1222 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1223
1224 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1225 return err;
1226 }
1227 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
1228 security_xfrm_policy_free(&tmp);
1229 }
1230 if (xp == NULL)
1231 return -ENOENT;
1232
1233 if (!delete) {
1234 struct sk_buff *resp_skb;
1235
1236 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1237 if (IS_ERR(resp_skb)) {
1238 err = PTR_ERR(resp_skb);
1239 } else {
1240 err = netlink_unicast(xfrm_nl, resp_skb,
1241 NETLINK_CB(skb).pid,
1242 MSG_DONTWAIT);
1243 }
1244 } else {
1245 if ((err = security_xfrm_policy_delete(xp)) != 0)
1246 goto out;
1247 c.data.byid = p->index;
1248 c.event = nlh->nlmsg_type;
1249 c.seq = nlh->nlmsg_seq;
1250 c.pid = nlh->nlmsg_pid;
1251 km_policy_notify(xp, p->dir, &c);
1252 }
1253
1254 xfrm_pol_put(xp);
1255
1256 out:
1257 return err;
1258 }
1259
1260 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1261 {
1262 struct km_event c;
1263 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1264
1265 xfrm_state_flush(p->proto);
1266 c.data.proto = p->proto;
1267 c.event = nlh->nlmsg_type;
1268 c.seq = nlh->nlmsg_seq;
1269 c.pid = nlh->nlmsg_pid;
1270 km_state_notify(NULL, &c);
1271
1272 return 0;
1273 }
1274
1275
1276 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1277 {
1278 struct xfrm_aevent_id *id;
1279 struct nlmsghdr *nlh;
1280 struct xfrm_lifetime_cur ltime;
1281 unsigned char *b = skb->tail;
1282
1283 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1284 id = NLMSG_DATA(nlh);
1285 nlh->nlmsg_flags = 0;
1286
1287 id->sa_id.daddr = x->id.daddr;
1288 id->sa_id.spi = x->id.spi;
1289 id->sa_id.family = x->props.family;
1290 id->sa_id.proto = x->id.proto;
1291 id->flags = c->data.aevent;
1292
1293 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1294
1295 ltime.bytes = x->curlft.bytes;
1296 ltime.packets = x->curlft.packets;
1297 ltime.add_time = x->curlft.add_time;
1298 ltime.use_time = x->curlft.use_time;
1299
1300 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1301
1302 if (id->flags&XFRM_AE_RTHR) {
1303 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1304 }
1305
1306 if (id->flags&XFRM_AE_ETHR) {
1307 u32 etimer = x->replay_maxage*10/HZ;
1308 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1309 }
1310
1311 nlh->nlmsg_len = skb->tail - b;
1312 return skb->len;
1313
1314 rtattr_failure:
1315 nlmsg_failure:
1316 skb_trim(skb, b - skb->data);
1317 return -1;
1318 }
1319
1320 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1321 {
1322 struct xfrm_state *x;
1323 struct sk_buff *r_skb;
1324 int err;
1325 struct km_event c;
1326 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1327 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1328 struct xfrm_usersa_id *id = &p->sa_id;
1329
1330 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1331 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1332
1333 if (p->flags&XFRM_AE_RTHR)
1334 len+=RTA_SPACE(sizeof(u32));
1335
1336 if (p->flags&XFRM_AE_ETHR)
1337 len+=RTA_SPACE(sizeof(u32));
1338
1339 r_skb = alloc_skb(len, GFP_ATOMIC);
1340 if (r_skb == NULL)
1341 return -ENOMEM;
1342
1343 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1344 if (x == NULL) {
1345 kfree(r_skb);
1346 return -ESRCH;
1347 }
1348
1349 /*
1350 * XXX: is this lock really needed - none of the other
1351 * gets lock (the concern is things getting updated
1352 * while we are still reading) - jhs
1353 */
1354 spin_lock_bh(&x->lock);
1355 c.data.aevent = p->flags;
1356 c.seq = nlh->nlmsg_seq;
1357 c.pid = nlh->nlmsg_pid;
1358
1359 if (build_aevent(r_skb, x, &c) < 0)
1360 BUG();
1361 err = netlink_unicast(xfrm_nl, r_skb,
1362 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1363 spin_unlock_bh(&x->lock);
1364 xfrm_state_put(x);
1365 return err;
1366 }
1367
1368 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1369 {
1370 struct xfrm_state *x;
1371 struct km_event c;
1372 int err = - EINVAL;
1373 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1374 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1375 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1376
1377 if (!lt && !rp)
1378 return err;
1379
1380 /* pedantic mode - thou shalt sayeth replaceth */
1381 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1382 return err;
1383
1384 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1385 if (x == NULL)
1386 return -ESRCH;
1387
1388 if (x->km.state != XFRM_STATE_VALID)
1389 goto out;
1390
1391 spin_lock_bh(&x->lock);
1392 err = xfrm_update_ae_params(x,(struct rtattr **)xfrma);
1393 spin_unlock_bh(&x->lock);
1394 if (err < 0)
1395 goto out;
1396
1397 c.event = nlh->nlmsg_type;
1398 c.seq = nlh->nlmsg_seq;
1399 c.pid = nlh->nlmsg_pid;
1400 c.data.aevent = XFRM_AE_CU;
1401 km_state_notify(x, &c);
1402 err = 0;
1403 out:
1404 xfrm_state_put(x);
1405 return err;
1406 }
1407
1408 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1409 {
1410 struct km_event c;
1411 __u8 type = XFRM_POLICY_TYPE_MAIN;
1412 int err;
1413
1414 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1415 if (err)
1416 return err;
1417
1418 xfrm_policy_flush(type);
1419 c.data.type = type;
1420 c.event = nlh->nlmsg_type;
1421 c.seq = nlh->nlmsg_seq;
1422 c.pid = nlh->nlmsg_pid;
1423 km_policy_notify(NULL, 0, &c);
1424 return 0;
1425 }
1426
1427 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1428 {
1429 struct xfrm_policy *xp;
1430 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1431 struct xfrm_userpolicy_info *p = &up->pol;
1432 __u8 type = XFRM_POLICY_TYPE_MAIN;
1433 int err = -ENOENT;
1434
1435 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1436 if (err)
1437 return err;
1438
1439 if (p->index)
1440 xp = xfrm_policy_byid(type, p->dir, p->index, 0);
1441 else {
1442 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1443 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1444 struct xfrm_policy tmp;
1445
1446 err = verify_sec_ctx_len(rtattrs);
1447 if (err)
1448 return err;
1449
1450 memset(&tmp, 0, sizeof(struct xfrm_policy));
1451 if (rt) {
1452 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1453
1454 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1455 return err;
1456 }
1457 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0);
1458 security_xfrm_policy_free(&tmp);
1459 }
1460
1461 if (xp == NULL)
1462 return err;
1463 read_lock(&xp->lock);
1464 if (xp->dead) {
1465 read_unlock(&xp->lock);
1466 goto out;
1467 }
1468
1469 read_unlock(&xp->lock);
1470 err = 0;
1471 if (up->hard) {
1472 xfrm_policy_delete(xp, p->dir);
1473 } else {
1474 // reset the timers here?
1475 printk("Dont know what to do with soft policy expire\n");
1476 }
1477 km_policy_expired(xp, p->dir, up->hard, current->pid);
1478
1479 out:
1480 xfrm_pol_put(xp);
1481 return err;
1482 }
1483
1484 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1485 {
1486 struct xfrm_state *x;
1487 int err;
1488 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1489 struct xfrm_usersa_info *p = &ue->state;
1490
1491 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1492 err = -ENOENT;
1493
1494 if (x == NULL)
1495 return err;
1496
1497 err = -EINVAL;
1498
1499 spin_lock_bh(&x->lock);
1500 if (x->km.state != XFRM_STATE_VALID)
1501 goto out;
1502 km_state_expired(x, ue->hard, current->pid);
1503
1504 if (ue->hard)
1505 __xfrm_state_delete(x);
1506 out:
1507 spin_unlock_bh(&x->lock);
1508 xfrm_state_put(x);
1509 return err;
1510 }
1511
1512 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1513 {
1514 struct xfrm_policy *xp;
1515 struct xfrm_user_tmpl *ut;
1516 int i;
1517 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1518
1519 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1520 struct xfrm_state *x = xfrm_state_alloc();
1521 int err = -ENOMEM;
1522
1523 if (!x)
1524 return err;
1525
1526 err = verify_newpolicy_info(&ua->policy);
1527 if (err) {
1528 printk("BAD policy passed\n");
1529 kfree(x);
1530 return err;
1531 }
1532
1533 /* build an XP */
1534 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) {
1535 kfree(x);
1536 return err;
1537 }
1538
1539 memcpy(&x->id, &ua->id, sizeof(ua->id));
1540 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1541 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1542
1543 ut = RTA_DATA(rt);
1544 /* extract the templates and for each call km_key */
1545 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1546 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1547 memcpy(&x->id, &t->id, sizeof(x->id));
1548 x->props.mode = t->mode;
1549 x->props.reqid = t->reqid;
1550 x->props.family = ut->family;
1551 t->aalgos = ua->aalgos;
1552 t->ealgos = ua->ealgos;
1553 t->calgos = ua->calgos;
1554 err = km_query(x, t, xp);
1555
1556 }
1557
1558 kfree(x);
1559 kfree(xp);
1560
1561 return 0;
1562 }
1563
1564
1565 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1566
1567 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1568 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1569 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1570 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1571 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1572 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1573 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1574 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1575 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1576 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1577 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1578 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1579 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1580 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1581 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1582 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1583 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1584 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1585 };
1586
1587 #undef XMSGSIZE
1588
1589 static struct xfrm_link {
1590 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
1591 int (*dump)(struct sk_buff *, struct netlink_callback *);
1592 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1593 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1594 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1595 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1596 .dump = xfrm_dump_sa },
1597 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1598 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1599 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1600 .dump = xfrm_dump_policy },
1601 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1602 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1603 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1604 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1605 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1606 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1607 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1608 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1609 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1610 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1611 };
1612
1613 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
1614 {
1615 struct rtattr *xfrma[XFRMA_MAX];
1616 struct xfrm_link *link;
1617 int type, min_len;
1618
1619 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
1620 return 0;
1621
1622 type = nlh->nlmsg_type;
1623
1624 /* A control message: ignore them */
1625 if (type < XFRM_MSG_BASE)
1626 return 0;
1627
1628 /* Unknown message: reply with EINVAL */
1629 if (type > XFRM_MSG_MAX)
1630 goto err_einval;
1631
1632 type -= XFRM_MSG_BASE;
1633 link = &xfrm_dispatch[type];
1634
1635 /* All operations require privileges, even GET */
1636 if (security_netlink_recv(skb, CAP_NET_ADMIN)) {
1637 *errp = -EPERM;
1638 return -1;
1639 }
1640
1641 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1642 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1643 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1644 if (link->dump == NULL)
1645 goto err_einval;
1646
1647 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
1648 link->dump, NULL)) != 0) {
1649 return -1;
1650 }
1651
1652 netlink_queue_skip(nlh, skb);
1653 return -1;
1654 }
1655
1656 memset(xfrma, 0, sizeof(xfrma));
1657
1658 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1659 goto err_einval;
1660
1661 if (nlh->nlmsg_len > min_len) {
1662 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1663 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1664
1665 while (RTA_OK(attr, attrlen)) {
1666 unsigned short flavor = attr->rta_type;
1667 if (flavor) {
1668 if (flavor > XFRMA_MAX)
1669 goto err_einval;
1670 xfrma[flavor - 1] = attr;
1671 }
1672 attr = RTA_NEXT(attr, attrlen);
1673 }
1674 }
1675
1676 if (link->doit == NULL)
1677 goto err_einval;
1678 *errp = link->doit(skb, nlh, (void **) &xfrma);
1679
1680 return *errp;
1681
1682 err_einval:
1683 *errp = -EINVAL;
1684 return -1;
1685 }
1686
1687 static void xfrm_netlink_rcv(struct sock *sk, int len)
1688 {
1689 unsigned int qlen = 0;
1690
1691 do {
1692 mutex_lock(&xfrm_cfg_mutex);
1693 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
1694 mutex_unlock(&xfrm_cfg_mutex);
1695
1696 } while (qlen);
1697 }
1698
1699 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1700 {
1701 struct xfrm_user_expire *ue;
1702 struct nlmsghdr *nlh;
1703 unsigned char *b = skb->tail;
1704
1705 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1706 sizeof(*ue));
1707 ue = NLMSG_DATA(nlh);
1708 nlh->nlmsg_flags = 0;
1709
1710 copy_to_user_state(x, &ue->state);
1711 ue->hard = (c->data.hard != 0) ? 1 : 0;
1712
1713 nlh->nlmsg_len = skb->tail - b;
1714 return skb->len;
1715
1716 nlmsg_failure:
1717 skb_trim(skb, b - skb->data);
1718 return -1;
1719 }
1720
1721 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1722 {
1723 struct sk_buff *skb;
1724 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1725
1726 skb = alloc_skb(len, GFP_ATOMIC);
1727 if (skb == NULL)
1728 return -ENOMEM;
1729
1730 if (build_expire(skb, x, c) < 0)
1731 BUG();
1732
1733 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1734 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1735 }
1736
1737 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1738 {
1739 struct sk_buff *skb;
1740 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1741
1742 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1743 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1744 skb = alloc_skb(len, GFP_ATOMIC);
1745 if (skb == NULL)
1746 return -ENOMEM;
1747
1748 if (build_aevent(skb, x, c) < 0)
1749 BUG();
1750
1751 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
1752 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1753 }
1754
1755 static int xfrm_notify_sa_flush(struct km_event *c)
1756 {
1757 struct xfrm_usersa_flush *p;
1758 struct nlmsghdr *nlh;
1759 struct sk_buff *skb;
1760 unsigned char *b;
1761 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1762
1763 skb = alloc_skb(len, GFP_ATOMIC);
1764 if (skb == NULL)
1765 return -ENOMEM;
1766 b = skb->tail;
1767
1768 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1769 XFRM_MSG_FLUSHSA, sizeof(*p));
1770 nlh->nlmsg_flags = 0;
1771
1772 p = NLMSG_DATA(nlh);
1773 p->proto = c->data.proto;
1774
1775 nlh->nlmsg_len = skb->tail - b;
1776
1777 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1778 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1779
1780 nlmsg_failure:
1781 kfree_skb(skb);
1782 return -1;
1783 }
1784
1785 static int inline xfrm_sa_len(struct xfrm_state *x)
1786 {
1787 int l = 0;
1788 if (x->aalg)
1789 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1790 if (x->ealg)
1791 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1792 if (x->calg)
1793 l += RTA_SPACE(sizeof(*x->calg));
1794 if (x->encap)
1795 l += RTA_SPACE(sizeof(*x->encap));
1796
1797 return l;
1798 }
1799
1800 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1801 {
1802 struct xfrm_usersa_info *p;
1803 struct xfrm_usersa_id *id;
1804 struct nlmsghdr *nlh;
1805 struct sk_buff *skb;
1806 unsigned char *b;
1807 int len = xfrm_sa_len(x);
1808 int headlen;
1809
1810 headlen = sizeof(*p);
1811 if (c->event == XFRM_MSG_DELSA) {
1812 len += RTA_SPACE(headlen);
1813 headlen = sizeof(*id);
1814 }
1815 len += NLMSG_SPACE(headlen);
1816
1817 skb = alloc_skb(len, GFP_ATOMIC);
1818 if (skb == NULL)
1819 return -ENOMEM;
1820 b = skb->tail;
1821
1822 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1823 nlh->nlmsg_flags = 0;
1824
1825 p = NLMSG_DATA(nlh);
1826 if (c->event == XFRM_MSG_DELSA) {
1827 id = NLMSG_DATA(nlh);
1828 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1829 id->spi = x->id.spi;
1830 id->family = x->props.family;
1831 id->proto = x->id.proto;
1832
1833 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1834 }
1835
1836 copy_to_user_state(x, p);
1837
1838 if (x->aalg)
1839 RTA_PUT(skb, XFRMA_ALG_AUTH,
1840 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1841 if (x->ealg)
1842 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1843 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1844 if (x->calg)
1845 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1846
1847 if (x->encap)
1848 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1849
1850 nlh->nlmsg_len = skb->tail - b;
1851
1852 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1853 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1854
1855 nlmsg_failure:
1856 rtattr_failure:
1857 kfree_skb(skb);
1858 return -1;
1859 }
1860
1861 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1862 {
1863
1864 switch (c->event) {
1865 case XFRM_MSG_EXPIRE:
1866 return xfrm_exp_state_notify(x, c);
1867 case XFRM_MSG_NEWAE:
1868 return xfrm_aevent_state_notify(x, c);
1869 case XFRM_MSG_DELSA:
1870 case XFRM_MSG_UPDSA:
1871 case XFRM_MSG_NEWSA:
1872 return xfrm_notify_sa(x, c);
1873 case XFRM_MSG_FLUSHSA:
1874 return xfrm_notify_sa_flush(c);
1875 default:
1876 printk("xfrm_user: Unknown SA event %d\n", c->event);
1877 break;
1878 }
1879
1880 return 0;
1881
1882 }
1883
1884 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1885 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1886 int dir)
1887 {
1888 struct xfrm_user_acquire *ua;
1889 struct nlmsghdr *nlh;
1890 unsigned char *b = skb->tail;
1891 __u32 seq = xfrm_get_acqseq();
1892
1893 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1894 sizeof(*ua));
1895 ua = NLMSG_DATA(nlh);
1896 nlh->nlmsg_flags = 0;
1897
1898 memcpy(&ua->id, &x->id, sizeof(ua->id));
1899 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1900 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1901 copy_to_user_policy(xp, &ua->policy, dir);
1902 ua->aalgos = xt->aalgos;
1903 ua->ealgos = xt->ealgos;
1904 ua->calgos = xt->calgos;
1905 ua->seq = x->km.seq = seq;
1906
1907 if (copy_to_user_tmpl(xp, skb) < 0)
1908 goto nlmsg_failure;
1909 if (copy_to_user_state_sec_ctx(x, skb))
1910 goto nlmsg_failure;
1911 if (copy_to_user_policy_type(xp, skb) < 0)
1912 goto nlmsg_failure;
1913
1914 nlh->nlmsg_len = skb->tail - b;
1915 return skb->len;
1916
1917 nlmsg_failure:
1918 skb_trim(skb, b - skb->data);
1919 return -1;
1920 }
1921
1922 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1923 struct xfrm_policy *xp, int dir)
1924 {
1925 struct sk_buff *skb;
1926 size_t len;
1927
1928 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1929 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1930 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
1931 #ifdef CONFIG_XFRM_SUB_POLICY
1932 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
1933 #endif
1934 skb = alloc_skb(len, GFP_ATOMIC);
1935 if (skb == NULL)
1936 return -ENOMEM;
1937
1938 if (build_acquire(skb, x, xt, xp, dir) < 0)
1939 BUG();
1940
1941 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
1942 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1943 }
1944
1945 /* User gives us xfrm_user_policy_info followed by an array of 0
1946 * or more templates.
1947 */
1948 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1949 u8 *data, int len, int *dir)
1950 {
1951 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1952 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1953 struct xfrm_policy *xp;
1954 int nr;
1955
1956 switch (sk->sk_family) {
1957 case AF_INET:
1958 if (opt != IP_XFRM_POLICY) {
1959 *dir = -EOPNOTSUPP;
1960 return NULL;
1961 }
1962 break;
1963 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1964 case AF_INET6:
1965 if (opt != IPV6_XFRM_POLICY) {
1966 *dir = -EOPNOTSUPP;
1967 return NULL;
1968 }
1969 break;
1970 #endif
1971 default:
1972 *dir = -EINVAL;
1973 return NULL;
1974 }
1975
1976 *dir = -EINVAL;
1977
1978 if (len < sizeof(*p) ||
1979 verify_newpolicy_info(p))
1980 return NULL;
1981
1982 nr = ((len - sizeof(*p)) / sizeof(*ut));
1983 if (nr > XFRM_MAX_DEPTH)
1984 return NULL;
1985
1986 if (p->dir > XFRM_POLICY_OUT)
1987 return NULL;
1988
1989 xp = xfrm_policy_alloc(GFP_KERNEL);
1990 if (xp == NULL) {
1991 *dir = -ENOBUFS;
1992 return NULL;
1993 }
1994
1995 copy_from_user_policy(xp, p);
1996 xp->type = XFRM_POLICY_TYPE_MAIN;
1997 copy_templates(xp, ut, nr);
1998
1999 *dir = p->dir;
2000
2001 return xp;
2002 }
2003
2004 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2005 int dir, struct km_event *c)
2006 {
2007 struct xfrm_user_polexpire *upe;
2008 struct nlmsghdr *nlh;
2009 int hard = c->data.hard;
2010 unsigned char *b = skb->tail;
2011
2012 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
2013 upe = NLMSG_DATA(nlh);
2014 nlh->nlmsg_flags = 0;
2015
2016 copy_to_user_policy(xp, &upe->pol, dir);
2017 if (copy_to_user_tmpl(xp, skb) < 0)
2018 goto nlmsg_failure;
2019 if (copy_to_user_sec_ctx(xp, skb))
2020 goto nlmsg_failure;
2021 if (copy_to_user_policy_type(xp, skb) < 0)
2022 goto nlmsg_failure;
2023 upe->hard = !!hard;
2024
2025 nlh->nlmsg_len = skb->tail - b;
2026 return skb->len;
2027
2028 nlmsg_failure:
2029 skb_trim(skb, b - skb->data);
2030 return -1;
2031 }
2032
2033 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2034 {
2035 struct sk_buff *skb;
2036 size_t len;
2037
2038 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2039 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2040 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
2041 #ifdef CONFIG_XFRM_SUB_POLICY
2042 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2043 #endif
2044 skb = alloc_skb(len, GFP_ATOMIC);
2045 if (skb == NULL)
2046 return -ENOMEM;
2047
2048 if (build_polexpire(skb, xp, dir, c) < 0)
2049 BUG();
2050
2051 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2052 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2053 }
2054
2055 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2056 {
2057 struct xfrm_userpolicy_info *p;
2058 struct xfrm_userpolicy_id *id;
2059 struct nlmsghdr *nlh;
2060 struct sk_buff *skb;
2061 unsigned char *b;
2062 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2063 int headlen;
2064
2065 headlen = sizeof(*p);
2066 if (c->event == XFRM_MSG_DELPOLICY) {
2067 len += RTA_SPACE(headlen);
2068 headlen = sizeof(*id);
2069 }
2070 #ifdef CONFIG_XFRM_SUB_POLICY
2071 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2072 #endif
2073 len += NLMSG_SPACE(headlen);
2074
2075 skb = alloc_skb(len, GFP_ATOMIC);
2076 if (skb == NULL)
2077 return -ENOMEM;
2078 b = skb->tail;
2079
2080 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2081
2082 p = NLMSG_DATA(nlh);
2083 if (c->event == XFRM_MSG_DELPOLICY) {
2084 id = NLMSG_DATA(nlh);
2085 memset(id, 0, sizeof(*id));
2086 id->dir = dir;
2087 if (c->data.byid)
2088 id->index = xp->index;
2089 else
2090 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2091
2092 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2093 }
2094
2095 nlh->nlmsg_flags = 0;
2096
2097 copy_to_user_policy(xp, p, dir);
2098 if (copy_to_user_tmpl(xp, skb) < 0)
2099 goto nlmsg_failure;
2100 if (copy_to_user_policy_type(xp, skb) < 0)
2101 goto nlmsg_failure;
2102
2103 nlh->nlmsg_len = skb->tail - b;
2104
2105 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2106 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2107
2108 nlmsg_failure:
2109 rtattr_failure:
2110 kfree_skb(skb);
2111 return -1;
2112 }
2113
2114 static int xfrm_notify_policy_flush(struct km_event *c)
2115 {
2116 struct nlmsghdr *nlh;
2117 struct sk_buff *skb;
2118 unsigned char *b;
2119 int len = 0;
2120 #ifdef CONFIG_XFRM_SUB_POLICY
2121 struct xfrm_userpolicy_type upt;
2122 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2123 #endif
2124 len += NLMSG_LENGTH(0);
2125
2126 skb = alloc_skb(len, GFP_ATOMIC);
2127 if (skb == NULL)
2128 return -ENOMEM;
2129 b = skb->tail;
2130
2131
2132 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2133 nlh->nlmsg_flags = 0;
2134
2135 #ifdef CONFIG_XFRM_SUB_POLICY
2136 memset(&upt, 0, sizeof(upt));
2137 upt.type = c->data.type;
2138 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2139 #endif
2140
2141 nlh->nlmsg_len = skb->tail - b;
2142
2143 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2144 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2145
2146 nlmsg_failure:
2147 #ifdef CONFIG_XFRM_SUB_POLICY
2148 rtattr_failure:
2149 #endif
2150 kfree_skb(skb);
2151 return -1;
2152 }
2153
2154 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2155 {
2156
2157 switch (c->event) {
2158 case XFRM_MSG_NEWPOLICY:
2159 case XFRM_MSG_UPDPOLICY:
2160 case XFRM_MSG_DELPOLICY:
2161 return xfrm_notify_policy(xp, dir, c);
2162 case XFRM_MSG_FLUSHPOLICY:
2163 return xfrm_notify_policy_flush(c);
2164 case XFRM_MSG_POLEXPIRE:
2165 return xfrm_exp_policy_notify(xp, dir, c);
2166 default:
2167 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2168 }
2169
2170 return 0;
2171
2172 }
2173
2174 static int build_report(struct sk_buff *skb, u8 proto,
2175 struct xfrm_selector *sel, xfrm_address_t *addr)
2176 {
2177 struct xfrm_user_report *ur;
2178 struct nlmsghdr *nlh;
2179 unsigned char *b = skb->tail;
2180
2181 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2182 ur = NLMSG_DATA(nlh);
2183 nlh->nlmsg_flags = 0;
2184
2185 ur->proto = proto;
2186 memcpy(&ur->sel, sel, sizeof(ur->sel));
2187
2188 if (addr)
2189 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2190
2191 nlh->nlmsg_len = skb->tail - b;
2192 return skb->len;
2193
2194 nlmsg_failure:
2195 rtattr_failure:
2196 skb_trim(skb, b - skb->data);
2197 return -1;
2198 }
2199
2200 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2201 xfrm_address_t *addr)
2202 {
2203 struct sk_buff *skb;
2204 size_t len;
2205
2206 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2207 skb = alloc_skb(len, GFP_ATOMIC);
2208 if (skb == NULL)
2209 return -ENOMEM;
2210
2211 if (build_report(skb, proto, sel, addr) < 0)
2212 BUG();
2213
2214 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2215 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2216 }
2217
2218 static struct xfrm_mgr netlink_mgr = {
2219 .id = "netlink",
2220 .notify = xfrm_send_state_notify,
2221 .acquire = xfrm_send_acquire,
2222 .compile_policy = xfrm_compile_policy,
2223 .notify_policy = xfrm_send_policy_notify,
2224 .report = xfrm_send_report,
2225 };
2226
2227 static int __init xfrm_user_init(void)
2228 {
2229 struct sock *nlsk;
2230
2231 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2232
2233 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2234 xfrm_netlink_rcv, THIS_MODULE);
2235 if (nlsk == NULL)
2236 return -ENOMEM;
2237 rcu_assign_pointer(xfrm_nl, nlsk);
2238
2239 xfrm_register_km(&netlink_mgr);
2240
2241 return 0;
2242 }
2243
2244 static void __exit xfrm_user_exit(void)
2245 {
2246 struct sock *nlsk = xfrm_nl;
2247
2248 xfrm_unregister_km(&netlink_mgr);
2249 rcu_assign_pointer(xfrm_nl, NULL);
2250 synchronize_rcu();
2251 sock_release(nlsk->sk_socket);
2252 }
2253
2254 module_init(xfrm_user_init);
2255 module_exit(xfrm_user_exit);
2256 MODULE_LICENSE("GPL");
2257 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2258
Support for the Chinese Samsung S3C2440 based development boards