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[NETLINK]: Remove error pointer from netlink message handler
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / xfrm / xfrm_user.c
blob5e52d6275badda6075b2642f2774dc90b30801ee
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/pfkeyv2.h>
24 #include <linux/ipsec.h>
25 #include <linux/init.h>
26 #include <linux/security.h>
27 #include <net/sock.h>
28 #include <net/xfrm.h>
29 #include <net/netlink.h>
30 #include <asm/uaccess.h>
31 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
32 #include <linux/in6.h>
33 #endif
34 #include <linux/audit.h>
35
36 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
37 {
38 struct rtattr *rt = xfrma[type - 1];
39 struct xfrm_algo *algp;
40 int len;
41
42 if (!rt)
43 return 0;
44
45 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
46 if (len < 0)
47 return -EINVAL;
48
49 algp = RTA_DATA(rt);
50
51 len -= (algp->alg_key_len + 7U) / 8;
52 if (len < 0)
53 return -EINVAL;
54
55 switch (type) {
56 case XFRMA_ALG_AUTH:
57 if (!algp->alg_key_len &&
58 strcmp(algp->alg_name, "digest_null") != 0)
59 return -EINVAL;
60 break;
61
62 case XFRMA_ALG_CRYPT:
63 if (!algp->alg_key_len &&
64 strcmp(algp->alg_name, "cipher_null") != 0)
65 return -EINVAL;
66 break;
67
68 case XFRMA_ALG_COMP:
69 /* Zero length keys are legal. */
70 break;
71
72 default:
73 return -EINVAL;
74 };
75
76 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
77 return 0;
78 }
79
80 static int verify_encap_tmpl(struct rtattr **xfrma)
81 {
82 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
83 struct xfrm_encap_tmpl *encap;
84
85 if (!rt)
86 return 0;
87
88 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
89 return -EINVAL;
90
91 return 0;
92 }
93
94 static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
95 xfrm_address_t **addrp)
96 {
97 struct rtattr *rt = xfrma[type - 1];
98
99 if (!rt)
100 return 0;
101
102 if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
103 return -EINVAL;
104
105 if (addrp)
106 *addrp = RTA_DATA(rt);
107
108 return 0;
109 }
110
111 static inline int verify_sec_ctx_len(struct rtattr **xfrma)
112 {
113 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
114 struct xfrm_user_sec_ctx *uctx;
115 int len = 0;
116
117 if (!rt)
118 return 0;
119
120 if (rt->rta_len < sizeof(*uctx))
121 return -EINVAL;
122
123 uctx = RTA_DATA(rt);
124
125 len += sizeof(struct xfrm_user_sec_ctx);
126 len += uctx->ctx_len;
127
128 if (uctx->len != len)
129 return -EINVAL;
130
131 return 0;
132 }
133
134
135 static int verify_newsa_info(struct xfrm_usersa_info *p,
136 struct rtattr **xfrma)
137 {
138 int err;
139
140 err = -EINVAL;
141 switch (p->family) {
142 case AF_INET:
143 break;
144
145 case AF_INET6:
146 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
147 break;
148 #else
149 err = -EAFNOSUPPORT;
150 goto out;
151 #endif
152
153 default:
154 goto out;
155 };
156
157 err = -EINVAL;
158 switch (p->id.proto) {
159 case IPPROTO_AH:
160 if (!xfrma[XFRMA_ALG_AUTH-1] ||
161 xfrma[XFRMA_ALG_CRYPT-1] ||
162 xfrma[XFRMA_ALG_COMP-1])
163 goto out;
164 break;
165
166 case IPPROTO_ESP:
167 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
168 !xfrma[XFRMA_ALG_CRYPT-1]) ||
169 xfrma[XFRMA_ALG_COMP-1])
170 goto out;
171 break;
172
173 case IPPROTO_COMP:
174 if (!xfrma[XFRMA_ALG_COMP-1] ||
175 xfrma[XFRMA_ALG_AUTH-1] ||
176 xfrma[XFRMA_ALG_CRYPT-1])
177 goto out;
178 break;
179
180 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
181 case IPPROTO_DSTOPTS:
182 case IPPROTO_ROUTING:
183 if (xfrma[XFRMA_ALG_COMP-1] ||
184 xfrma[XFRMA_ALG_AUTH-1] ||
185 xfrma[XFRMA_ALG_CRYPT-1] ||
186 xfrma[XFRMA_ENCAP-1] ||
187 xfrma[XFRMA_SEC_CTX-1] ||
188 !xfrma[XFRMA_COADDR-1])
189 goto out;
190 break;
191 #endif
192
193 default:
194 goto out;
195 };
196
197 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
198 goto out;
199 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
200 goto out;
201 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
202 goto out;
203 if ((err = verify_encap_tmpl(xfrma)))
204 goto out;
205 if ((err = verify_sec_ctx_len(xfrma)))
206 goto out;
207 if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
208 goto out;
209
210 err = -EINVAL;
211 switch (p->mode) {
212 case XFRM_MODE_TRANSPORT:
213 case XFRM_MODE_TUNNEL:
214 case XFRM_MODE_ROUTEOPTIMIZATION:
215 case XFRM_MODE_BEET:
216 break;
217
218 default:
219 goto out;
220 };
221
222 err = 0;
223
224 out:
225 return err;
226 }
227
228 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
229 struct xfrm_algo_desc *(*get_byname)(char *, int),
230 struct rtattr *u_arg)
231 {
232 struct rtattr *rta = u_arg;
233 struct xfrm_algo *p, *ualg;
234 struct xfrm_algo_desc *algo;
235 int len;
236
237 if (!rta)
238 return 0;
239
240 ualg = RTA_DATA(rta);
241
242 algo = get_byname(ualg->alg_name, 1);
243 if (!algo)
244 return -ENOSYS;
245 *props = algo->desc.sadb_alg_id;
246
247 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
248 p = kmemdup(ualg, len, GFP_KERNEL);
249 if (!p)
250 return -ENOMEM;
251
252 strcpy(p->alg_name, algo->name);
253 *algpp = p;
254 return 0;
255 }
256
257 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
258 {
259 struct rtattr *rta = u_arg;
260 struct xfrm_encap_tmpl *p, *uencap;
261
262 if (!rta)
263 return 0;
264
265 uencap = RTA_DATA(rta);
266 p = kmemdup(uencap, sizeof(*p), GFP_KERNEL);
267 if (!p)
268 return -ENOMEM;
269
270 *encapp = p;
271 return 0;
272 }
273
274
275 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
276 {
277 int len = 0;
278
279 if (xfrm_ctx) {
280 len += sizeof(struct xfrm_user_sec_ctx);
281 len += xfrm_ctx->ctx_len;
282 }
283 return len;
284 }
285
286 static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
287 {
288 struct xfrm_user_sec_ctx *uctx;
289
290 if (!u_arg)
291 return 0;
292
293 uctx = RTA_DATA(u_arg);
294 return security_xfrm_state_alloc(x, uctx);
295 }
296
297 static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
298 {
299 struct rtattr *rta = u_arg;
300 xfrm_address_t *p, *uaddrp;
301
302 if (!rta)
303 return 0;
304
305 uaddrp = RTA_DATA(rta);
306 p = kmemdup(uaddrp, sizeof(*p), GFP_KERNEL);
307 if (!p)
308 return -ENOMEM;
309
310 *addrpp = p;
311 return 0;
312 }
313
314 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
315 {
316 memcpy(&x->id, &p->id, sizeof(x->id));
317 memcpy(&x->sel, &p->sel, sizeof(x->sel));
318 memcpy(&x->lft, &p->lft, sizeof(x->lft));
319 x->props.mode = p->mode;
320 x->props.replay_window = p->replay_window;
321 x->props.reqid = p->reqid;
322 x->props.family = p->family;
323 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
324 x->props.flags = p->flags;
325 }
326
327 /*
328 * someday when pfkey also has support, we could have the code
329 * somehow made shareable and move it to xfrm_state.c - JHS
330 *
331 */
332 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
333 {
334 int err = - EINVAL;
335 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
336 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
337 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
338 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
339
340 if (rp) {
341 struct xfrm_replay_state *replay;
342 if (RTA_PAYLOAD(rp) < sizeof(*replay))
343 goto error;
344 replay = RTA_DATA(rp);
345 memcpy(&x->replay, replay, sizeof(*replay));
346 memcpy(&x->preplay, replay, sizeof(*replay));
347 }
348
349 if (lt) {
350 struct xfrm_lifetime_cur *ltime;
351 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
352 goto error;
353 ltime = RTA_DATA(lt);
354 x->curlft.bytes = ltime->bytes;
355 x->curlft.packets = ltime->packets;
356 x->curlft.add_time = ltime->add_time;
357 x->curlft.use_time = ltime->use_time;
358 }
359
360 if (et) {
361 if (RTA_PAYLOAD(et) < sizeof(u32))
362 goto error;
363 x->replay_maxage = *(u32*)RTA_DATA(et);
364 }
365
366 if (rt) {
367 if (RTA_PAYLOAD(rt) < sizeof(u32))
368 goto error;
369 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
370 }
371
372 return 0;
373 error:
374 return err;
375 }
376
377 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
378 struct rtattr **xfrma,
379 int *errp)
380 {
381 struct xfrm_state *x = xfrm_state_alloc();
382 int err = -ENOMEM;
383
384 if (!x)
385 goto error_no_put;
386
387 copy_from_user_state(x, p);
388
389 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
390 xfrm_aalg_get_byname,
391 xfrma[XFRMA_ALG_AUTH-1])))
392 goto error;
393 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
394 xfrm_ealg_get_byname,
395 xfrma[XFRMA_ALG_CRYPT-1])))
396 goto error;
397 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
398 xfrm_calg_get_byname,
399 xfrma[XFRMA_ALG_COMP-1])))
400 goto error;
401 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
402 goto error;
403 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
404 goto error;
405 err = xfrm_init_state(x);
406 if (err)
407 goto error;
408
409 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
410 goto error;
411
412 x->km.seq = p->seq;
413 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
414 /* sysctl_xfrm_aevent_etime is in 100ms units */
415 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
416 x->preplay.bitmap = 0;
417 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
418 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
419
420 /* override default values from above */
421
422 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
423 if (err < 0)
424 goto error;
425
426 return x;
427
428 error:
429 x->km.state = XFRM_STATE_DEAD;
430 xfrm_state_put(x);
431 error_no_put:
432 *errp = err;
433 return NULL;
434 }
435
436 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
437 struct rtattr **xfrma)
438 {
439 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
440 struct xfrm_state *x;
441 int err;
442 struct km_event c;
443
444 err = verify_newsa_info(p, xfrma);
445 if (err)
446 return err;
447
448 x = xfrm_state_construct(p, xfrma, &err);
449 if (!x)
450 return err;
451
452 xfrm_state_hold(x);
453 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
454 err = xfrm_state_add(x);
455 else
456 err = xfrm_state_update(x);
457
458 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
459 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
460
461 if (err < 0) {
462 x->km.state = XFRM_STATE_DEAD;
463 __xfrm_state_put(x);
464 goto out;
465 }
466
467 c.seq = nlh->nlmsg_seq;
468 c.pid = nlh->nlmsg_pid;
469 c.event = nlh->nlmsg_type;
470
471 km_state_notify(x, &c);
472 out:
473 xfrm_state_put(x);
474 return err;
475 }
476
477 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
478 struct rtattr **xfrma,
479 int *errp)
480 {
481 struct xfrm_state *x = NULL;
482 int err;
483
484 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
485 err = -ESRCH;
486 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
487 } else {
488 xfrm_address_t *saddr = NULL;
489
490 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
491 if (err)
492 goto out;
493
494 if (!saddr) {
495 err = -EINVAL;
496 goto out;
497 }
498
499 err = -ESRCH;
500 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
501 p->family);
502 }
503
504 out:
505 if (!x && errp)
506 *errp = err;
507 return x;
508 }
509
510 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
511 struct rtattr **xfrma)
512 {
513 struct xfrm_state *x;
514 int err = -ESRCH;
515 struct km_event c;
516 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
517
518 x = xfrm_user_state_lookup(p, xfrma, &err);
519 if (x == NULL)
520 return err;
521
522 if ((err = security_xfrm_state_delete(x)) != 0)
523 goto out;
524
525 if (xfrm_state_kern(x)) {
526 err = -EPERM;
527 goto out;
528 }
529
530 err = xfrm_state_delete(x);
531
532 if (err < 0)
533 goto out;
534
535 c.seq = nlh->nlmsg_seq;
536 c.pid = nlh->nlmsg_pid;
537 c.event = nlh->nlmsg_type;
538 km_state_notify(x, &c);
539
540 out:
541 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
542 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
543 xfrm_state_put(x);
544 return err;
545 }
546
547 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
548 {
549 memcpy(&p->id, &x->id, sizeof(p->id));
550 memcpy(&p->sel, &x->sel, sizeof(p->sel));
551 memcpy(&p->lft, &x->lft, sizeof(p->lft));
552 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
553 memcpy(&p->stats, &x->stats, sizeof(p->stats));
554 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
555 p->mode = x->props.mode;
556 p->replay_window = x->props.replay_window;
557 p->reqid = x->props.reqid;
558 p->family = x->props.family;
559 p->flags = x->props.flags;
560 p->seq = x->km.seq;
561 }
562
563 struct xfrm_dump_info {
564 struct sk_buff *in_skb;
565 struct sk_buff *out_skb;
566 u32 nlmsg_seq;
567 u16 nlmsg_flags;
568 int start_idx;
569 int this_idx;
570 };
571
572 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
573 {
574 struct xfrm_dump_info *sp = ptr;
575 struct sk_buff *in_skb = sp->in_skb;
576 struct sk_buff *skb = sp->out_skb;
577 struct xfrm_usersa_info *p;
578 struct nlmsghdr *nlh;
579 unsigned char *b = skb_tail_pointer(skb);
580
581 if (sp->this_idx < sp->start_idx)
582 goto out;
583
584 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
585 sp->nlmsg_seq,
586 XFRM_MSG_NEWSA, sizeof(*p));
587 nlh->nlmsg_flags = sp->nlmsg_flags;
588
589 p = NLMSG_DATA(nlh);
590 copy_to_user_state(x, p);
591
592 if (x->aalg)
593 RTA_PUT(skb, XFRMA_ALG_AUTH,
594 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
595 if (x->ealg)
596 RTA_PUT(skb, XFRMA_ALG_CRYPT,
597 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
598 if (x->calg)
599 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
600
601 if (x->encap)
602 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
603
604 if (x->security) {
605 int ctx_size = sizeof(struct xfrm_sec_ctx) +
606 x->security->ctx_len;
607 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
608 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
609
610 uctx->exttype = XFRMA_SEC_CTX;
611 uctx->len = ctx_size;
612 uctx->ctx_doi = x->security->ctx_doi;
613 uctx->ctx_alg = x->security->ctx_alg;
614 uctx->ctx_len = x->security->ctx_len;
615 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
616 }
617
618 if (x->coaddr)
619 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
620
621 if (x->lastused)
622 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
623
624 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
625 out:
626 sp->this_idx++;
627 return 0;
628
629 nlmsg_failure:
630 rtattr_failure:
631 nlmsg_trim(skb, b);
632 return -1;
633 }
634
635 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
636 {
637 struct xfrm_dump_info info;
638
639 info.in_skb = cb->skb;
640 info.out_skb = skb;
641 info.nlmsg_seq = cb->nlh->nlmsg_seq;
642 info.nlmsg_flags = NLM_F_MULTI;
643 info.this_idx = 0;
644 info.start_idx = cb->args[0];
645 (void) xfrm_state_walk(0, dump_one_state, &info);
646 cb->args[0] = info.this_idx;
647
648 return skb->len;
649 }
650
651 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
652 struct xfrm_state *x, u32 seq)
653 {
654 struct xfrm_dump_info info;
655 struct sk_buff *skb;
656
657 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
658 if (!skb)
659 return ERR_PTR(-ENOMEM);
660
661 info.in_skb = in_skb;
662 info.out_skb = skb;
663 info.nlmsg_seq = seq;
664 info.nlmsg_flags = 0;
665 info.this_idx = info.start_idx = 0;
666
667 if (dump_one_state(x, 0, &info)) {
668 kfree_skb(skb);
669 return NULL;
670 }
671
672 return skb;
673 }
674
675 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
676 struct rtattr **xfrma)
677 {
678 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
679 struct xfrm_state *x;
680 struct sk_buff *resp_skb;
681 int err = -ESRCH;
682
683 x = xfrm_user_state_lookup(p, xfrma, &err);
684 if (x == NULL)
685 goto out_noput;
686
687 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
688 if (IS_ERR(resp_skb)) {
689 err = PTR_ERR(resp_skb);
690 } else {
691 err = netlink_unicast(xfrm_nl, resp_skb,
692 NETLINK_CB(skb).pid, MSG_DONTWAIT);
693 }
694 xfrm_state_put(x);
695 out_noput:
696 return err;
697 }
698
699 static int verify_userspi_info(struct xfrm_userspi_info *p)
700 {
701 switch (p->info.id.proto) {
702 case IPPROTO_AH:
703 case IPPROTO_ESP:
704 break;
705
706 case IPPROTO_COMP:
707 /* IPCOMP spi is 16-bits. */
708 if (p->max >= 0x10000)
709 return -EINVAL;
710 break;
711
712 default:
713 return -EINVAL;
714 };
715
716 if (p->min > p->max)
717 return -EINVAL;
718
719 return 0;
720 }
721
722 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
723 struct rtattr **xfrma)
724 {
725 struct xfrm_state *x;
726 struct xfrm_userspi_info *p;
727 struct sk_buff *resp_skb;
728 xfrm_address_t *daddr;
729 int family;
730 int err;
731
732 p = NLMSG_DATA(nlh);
733 err = verify_userspi_info(p);
734 if (err)
735 goto out_noput;
736
737 family = p->info.family;
738 daddr = &p->info.id.daddr;
739
740 x = NULL;
741 if (p->info.seq) {
742 x = xfrm_find_acq_byseq(p->info.seq);
743 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
744 xfrm_state_put(x);
745 x = NULL;
746 }
747 }
748
749 if (!x)
750 x = xfrm_find_acq(p->info.mode, p->info.reqid,
751 p->info.id.proto, daddr,
752 &p->info.saddr, 1,
753 family);
754 err = -ENOENT;
755 if (x == NULL)
756 goto out_noput;
757
758 resp_skb = ERR_PTR(-ENOENT);
759
760 spin_lock_bh(&x->lock);
761 if (x->km.state != XFRM_STATE_DEAD) {
762 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
763 if (x->id.spi)
764 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
765 }
766 spin_unlock_bh(&x->lock);
767
768 if (IS_ERR(resp_skb)) {
769 err = PTR_ERR(resp_skb);
770 goto out;
771 }
772
773 err = netlink_unicast(xfrm_nl, resp_skb,
774 NETLINK_CB(skb).pid, MSG_DONTWAIT);
775
776 out:
777 xfrm_state_put(x);
778 out_noput:
779 return err;
780 }
781
782 static int verify_policy_dir(u8 dir)
783 {
784 switch (dir) {
785 case XFRM_POLICY_IN:
786 case XFRM_POLICY_OUT:
787 case XFRM_POLICY_FWD:
788 break;
789
790 default:
791 return -EINVAL;
792 };
793
794 return 0;
795 }
796
797 static int verify_policy_type(u8 type)
798 {
799 switch (type) {
800 case XFRM_POLICY_TYPE_MAIN:
801 #ifdef CONFIG_XFRM_SUB_POLICY
802 case XFRM_POLICY_TYPE_SUB:
803 #endif
804 break;
805
806 default:
807 return -EINVAL;
808 };
809
810 return 0;
811 }
812
813 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
814 {
815 switch (p->share) {
816 case XFRM_SHARE_ANY:
817 case XFRM_SHARE_SESSION:
818 case XFRM_SHARE_USER:
819 case XFRM_SHARE_UNIQUE:
820 break;
821
822 default:
823 return -EINVAL;
824 };
825
826 switch (p->action) {
827 case XFRM_POLICY_ALLOW:
828 case XFRM_POLICY_BLOCK:
829 break;
830
831 default:
832 return -EINVAL;
833 };
834
835 switch (p->sel.family) {
836 case AF_INET:
837 break;
838
839 case AF_INET6:
840 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
841 break;
842 #else
843 return -EAFNOSUPPORT;
844 #endif
845
846 default:
847 return -EINVAL;
848 };
849
850 return verify_policy_dir(p->dir);
851 }
852
853 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
854 {
855 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
856 struct xfrm_user_sec_ctx *uctx;
857
858 if (!rt)
859 return 0;
860
861 uctx = RTA_DATA(rt);
862 return security_xfrm_policy_alloc(pol, uctx);
863 }
864
865 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
866 int nr)
867 {
868 int i;
869
870 xp->xfrm_nr = nr;
871 for (i = 0; i < nr; i++, ut++) {
872 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
873
874 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
875 memcpy(&t->saddr, &ut->saddr,
876 sizeof(xfrm_address_t));
877 t->reqid = ut->reqid;
878 t->mode = ut->mode;
879 t->share = ut->share;
880 t->optional = ut->optional;
881 t->aalgos = ut->aalgos;
882 t->ealgos = ut->ealgos;
883 t->calgos = ut->calgos;
884 t->encap_family = ut->family;
885 }
886 }
887
888 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
889 {
890 int i;
891
892 if (nr > XFRM_MAX_DEPTH)
893 return -EINVAL;
894
895 for (i = 0; i < nr; i++) {
896 /* We never validated the ut->family value, so many
897 * applications simply leave it at zero. The check was
898 * never made and ut->family was ignored because all
899 * templates could be assumed to have the same family as
900 * the policy itself. Now that we will have ipv4-in-ipv6
901 * and ipv6-in-ipv4 tunnels, this is no longer true.
902 */
903 if (!ut[i].family)
904 ut[i].family = family;
905
906 switch (ut[i].family) {
907 case AF_INET:
908 break;
909 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
910 case AF_INET6:
911 break;
912 #endif
913 default:
914 return -EINVAL;
915 };
916 }
917
918 return 0;
919 }
920
921 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
922 {
923 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
924
925 if (!rt) {
926 pol->xfrm_nr = 0;
927 } else {
928 struct xfrm_user_tmpl *utmpl = RTA_DATA(rt);
929 int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
930 int err;
931
932 err = validate_tmpl(nr, utmpl, pol->family);
933 if (err)
934 return err;
935
936 copy_templates(pol, RTA_DATA(rt), nr);
937 }
938 return 0;
939 }
940
941 static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
942 {
943 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
944 struct xfrm_userpolicy_type *upt;
945 u8 type = XFRM_POLICY_TYPE_MAIN;
946 int err;
947
948 if (rt) {
949 if (rt->rta_len < sizeof(*upt))
950 return -EINVAL;
951
952 upt = RTA_DATA(rt);
953 type = upt->type;
954 }
955
956 err = verify_policy_type(type);
957 if (err)
958 return err;
959
960 *tp = type;
961 return 0;
962 }
963
964 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
965 {
966 xp->priority = p->priority;
967 xp->index = p->index;
968 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
969 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
970 xp->action = p->action;
971 xp->flags = p->flags;
972 xp->family = p->sel.family;
973 /* XXX xp->share = p->share; */
974 }
975
976 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
977 {
978 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
979 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
980 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
981 p->priority = xp->priority;
982 p->index = xp->index;
983 p->sel.family = xp->family;
984 p->dir = dir;
985 p->action = xp->action;
986 p->flags = xp->flags;
987 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
988 }
989
990 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
991 {
992 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
993 int err;
994
995 if (!xp) {
996 *errp = -ENOMEM;
997 return NULL;
998 }
999
1000 copy_from_user_policy(xp, p);
1001
1002 err = copy_from_user_policy_type(&xp->type, xfrma);
1003 if (err)
1004 goto error;
1005
1006 if (!(err = copy_from_user_tmpl(xp, xfrma)))
1007 err = copy_from_user_sec_ctx(xp, xfrma);
1008 if (err)
1009 goto error;
1010
1011 return xp;
1012 error:
1013 *errp = err;
1014 kfree(xp);
1015 return NULL;
1016 }
1017
1018 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1019 struct rtattr **xfrma)
1020 {
1021 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
1022 struct xfrm_policy *xp;
1023 struct km_event c;
1024 int err;
1025 int excl;
1026
1027 err = verify_newpolicy_info(p);
1028 if (err)
1029 return err;
1030 err = verify_sec_ctx_len(xfrma);
1031 if (err)
1032 return err;
1033
1034 xp = xfrm_policy_construct(p, xfrma, &err);
1035 if (!xp)
1036 return err;
1037
1038 /* shouldnt excl be based on nlh flags??
1039 * Aha! this is anti-netlink really i.e more pfkey derived
1040 * in netlink excl is a flag and you wouldnt need
1041 * a type XFRM_MSG_UPDPOLICY - JHS */
1042 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1043 err = xfrm_policy_insert(p->dir, xp, excl);
1044 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1045 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1046
1047 if (err) {
1048 security_xfrm_policy_free(xp);
1049 kfree(xp);
1050 return err;
1051 }
1052
1053 c.event = nlh->nlmsg_type;
1054 c.seq = nlh->nlmsg_seq;
1055 c.pid = nlh->nlmsg_pid;
1056 km_policy_notify(xp, p->dir, &c);
1057
1058 xfrm_pol_put(xp);
1059
1060 return 0;
1061 }
1062
1063 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1064 {
1065 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1066 int i;
1067
1068 if (xp->xfrm_nr == 0)
1069 return 0;
1070
1071 for (i = 0; i < xp->xfrm_nr; i++) {
1072 struct xfrm_user_tmpl *up = &vec[i];
1073 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1074
1075 memcpy(&up->id, &kp->id, sizeof(up->id));
1076 up->family = kp->encap_family;
1077 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1078 up->reqid = kp->reqid;
1079 up->mode = kp->mode;
1080 up->share = kp->share;
1081 up->optional = kp->optional;
1082 up->aalgos = kp->aalgos;
1083 up->ealgos = kp->ealgos;
1084 up->calgos = kp->calgos;
1085 }
1086 RTA_PUT(skb, XFRMA_TMPL,
1087 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1088 vec);
1089
1090 return 0;
1091
1092 rtattr_failure:
1093 return -1;
1094 }
1095
1096 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1097 {
1098 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1099 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1100 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1101
1102 uctx->exttype = XFRMA_SEC_CTX;
1103 uctx->len = ctx_size;
1104 uctx->ctx_doi = s->ctx_doi;
1105 uctx->ctx_alg = s->ctx_alg;
1106 uctx->ctx_len = s->ctx_len;
1107 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1108 return 0;
1109
1110 rtattr_failure:
1111 return -1;
1112 }
1113
1114 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1115 {
1116 if (x->security) {
1117 return copy_sec_ctx(x->security, skb);
1118 }
1119 return 0;
1120 }
1121
1122 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1123 {
1124 if (xp->security) {
1125 return copy_sec_ctx(xp->security, skb);
1126 }
1127 return 0;
1128 }
1129
1130 #ifdef CONFIG_XFRM_SUB_POLICY
1131 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1132 {
1133 struct xfrm_userpolicy_type upt;
1134
1135 memset(&upt, 0, sizeof(upt));
1136 upt.type = type;
1137
1138 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1139
1140 return 0;
1141
1142 rtattr_failure:
1143 return -1;
1144 }
1145
1146 #else
1147 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1148 {
1149 return 0;
1150 }
1151 #endif
1152
1153 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1154 {
1155 struct xfrm_dump_info *sp = ptr;
1156 struct xfrm_userpolicy_info *p;
1157 struct sk_buff *in_skb = sp->in_skb;
1158 struct sk_buff *skb = sp->out_skb;
1159 struct nlmsghdr *nlh;
1160 unsigned char *b = skb_tail_pointer(skb);
1161
1162 if (sp->this_idx < sp->start_idx)
1163 goto out;
1164
1165 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1166 sp->nlmsg_seq,
1167 XFRM_MSG_NEWPOLICY, sizeof(*p));
1168 p = NLMSG_DATA(nlh);
1169 nlh->nlmsg_flags = sp->nlmsg_flags;
1170
1171 copy_to_user_policy(xp, p, dir);
1172 if (copy_to_user_tmpl(xp, skb) < 0)
1173 goto nlmsg_failure;
1174 if (copy_to_user_sec_ctx(xp, skb))
1175 goto nlmsg_failure;
1176 if (copy_to_user_policy_type(xp->type, skb) < 0)
1177 goto nlmsg_failure;
1178
1179 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1180 out:
1181 sp->this_idx++;
1182 return 0;
1183
1184 nlmsg_failure:
1185 nlmsg_trim(skb, b);
1186 return -1;
1187 }
1188
1189 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1190 {
1191 struct xfrm_dump_info info;
1192
1193 info.in_skb = cb->skb;
1194 info.out_skb = skb;
1195 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1196 info.nlmsg_flags = NLM_F_MULTI;
1197 info.this_idx = 0;
1198 info.start_idx = cb->args[0];
1199 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1200 #ifdef CONFIG_XFRM_SUB_POLICY
1201 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1202 #endif
1203 cb->args[0] = info.this_idx;
1204
1205 return skb->len;
1206 }
1207
1208 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1209 struct xfrm_policy *xp,
1210 int dir, u32 seq)
1211 {
1212 struct xfrm_dump_info info;
1213 struct sk_buff *skb;
1214
1215 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1216 if (!skb)
1217 return ERR_PTR(-ENOMEM);
1218
1219 info.in_skb = in_skb;
1220 info.out_skb = skb;
1221 info.nlmsg_seq = seq;
1222 info.nlmsg_flags = 0;
1223 info.this_idx = info.start_idx = 0;
1224
1225 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1226 kfree_skb(skb);
1227 return NULL;
1228 }
1229
1230 return skb;
1231 }
1232
1233 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1234 struct rtattr **xfrma)
1235 {
1236 struct xfrm_policy *xp;
1237 struct xfrm_userpolicy_id *p;
1238 u8 type = XFRM_POLICY_TYPE_MAIN;
1239 int err;
1240 struct km_event c;
1241 int delete;
1242
1243 p = NLMSG_DATA(nlh);
1244 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1245
1246 err = copy_from_user_policy_type(&type, xfrma);
1247 if (err)
1248 return err;
1249
1250 err = verify_policy_dir(p->dir);
1251 if (err)
1252 return err;
1253
1254 if (p->index)
1255 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1256 else {
1257 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1258 struct xfrm_policy tmp;
1259
1260 err = verify_sec_ctx_len(xfrma);
1261 if (err)
1262 return err;
1263
1264 memset(&tmp, 0, sizeof(struct xfrm_policy));
1265 if (rt) {
1266 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1267
1268 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1269 return err;
1270 }
1271 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1272 delete, &err);
1273 security_xfrm_policy_free(&tmp);
1274 }
1275 if (xp == NULL)
1276 return -ENOENT;
1277
1278 if (!delete) {
1279 struct sk_buff *resp_skb;
1280
1281 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1282 if (IS_ERR(resp_skb)) {
1283 err = PTR_ERR(resp_skb);
1284 } else {
1285 err = netlink_unicast(xfrm_nl, resp_skb,
1286 NETLINK_CB(skb).pid,
1287 MSG_DONTWAIT);
1288 }
1289 } else {
1290 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1291 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1292
1293 if (err != 0)
1294 goto out;
1295
1296 c.data.byid = p->index;
1297 c.event = nlh->nlmsg_type;
1298 c.seq = nlh->nlmsg_seq;
1299 c.pid = nlh->nlmsg_pid;
1300 km_policy_notify(xp, p->dir, &c);
1301 }
1302
1303 out:
1304 xfrm_pol_put(xp);
1305 return err;
1306 }
1307
1308 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1309 struct rtattr **xfrma)
1310 {
1311 struct km_event c;
1312 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1313 struct xfrm_audit audit_info;
1314
1315 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1316 audit_info.secid = NETLINK_CB(skb).sid;
1317 xfrm_state_flush(p->proto, &audit_info);
1318 c.data.proto = p->proto;
1319 c.event = nlh->nlmsg_type;
1320 c.seq = nlh->nlmsg_seq;
1321 c.pid = nlh->nlmsg_pid;
1322 km_state_notify(NULL, &c);
1323
1324 return 0;
1325 }
1326
1327
1328 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1329 {
1330 struct xfrm_aevent_id *id;
1331 struct nlmsghdr *nlh;
1332 struct xfrm_lifetime_cur ltime;
1333 unsigned char *b = skb_tail_pointer(skb);
1334
1335 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1336 id = NLMSG_DATA(nlh);
1337 nlh->nlmsg_flags = 0;
1338
1339 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1340 id->sa_id.spi = x->id.spi;
1341 id->sa_id.family = x->props.family;
1342 id->sa_id.proto = x->id.proto;
1343 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1344 id->reqid = x->props.reqid;
1345 id->flags = c->data.aevent;
1346
1347 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1348
1349 ltime.bytes = x->curlft.bytes;
1350 ltime.packets = x->curlft.packets;
1351 ltime.add_time = x->curlft.add_time;
1352 ltime.use_time = x->curlft.use_time;
1353
1354 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1355
1356 if (id->flags&XFRM_AE_RTHR) {
1357 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1358 }
1359
1360 if (id->flags&XFRM_AE_ETHR) {
1361 u32 etimer = x->replay_maxage*10/HZ;
1362 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1363 }
1364
1365 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1366 return skb->len;
1367
1368 rtattr_failure:
1369 nlmsg_failure:
1370 nlmsg_trim(skb, b);
1371 return -1;
1372 }
1373
1374 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1375 struct rtattr **xfrma)
1376 {
1377 struct xfrm_state *x;
1378 struct sk_buff *r_skb;
1379 int err;
1380 struct km_event c;
1381 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1382 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1383 struct xfrm_usersa_id *id = &p->sa_id;
1384
1385 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1386 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1387
1388 if (p->flags&XFRM_AE_RTHR)
1389 len+=RTA_SPACE(sizeof(u32));
1390
1391 if (p->flags&XFRM_AE_ETHR)
1392 len+=RTA_SPACE(sizeof(u32));
1393
1394 r_skb = alloc_skb(len, GFP_ATOMIC);
1395 if (r_skb == NULL)
1396 return -ENOMEM;
1397
1398 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1399 if (x == NULL) {
1400 kfree_skb(r_skb);
1401 return -ESRCH;
1402 }
1403
1404 /*
1405 * XXX: is this lock really needed - none of the other
1406 * gets lock (the concern is things getting updated
1407 * while we are still reading) - jhs
1408 */
1409 spin_lock_bh(&x->lock);
1410 c.data.aevent = p->flags;
1411 c.seq = nlh->nlmsg_seq;
1412 c.pid = nlh->nlmsg_pid;
1413
1414 if (build_aevent(r_skb, x, &c) < 0)
1415 BUG();
1416 err = netlink_unicast(xfrm_nl, r_skb,
1417 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1418 spin_unlock_bh(&x->lock);
1419 xfrm_state_put(x);
1420 return err;
1421 }
1422
1423 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1424 struct rtattr **xfrma)
1425 {
1426 struct xfrm_state *x;
1427 struct km_event c;
1428 int err = - EINVAL;
1429 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1430 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1431 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1432
1433 if (!lt && !rp)
1434 return err;
1435
1436 /* pedantic mode - thou shalt sayeth replaceth */
1437 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1438 return err;
1439
1440 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1441 if (x == NULL)
1442 return -ESRCH;
1443
1444 if (x->km.state != XFRM_STATE_VALID)
1445 goto out;
1446
1447 spin_lock_bh(&x->lock);
1448 err = xfrm_update_ae_params(x, xfrma);
1449 spin_unlock_bh(&x->lock);
1450 if (err < 0)
1451 goto out;
1452
1453 c.event = nlh->nlmsg_type;
1454 c.seq = nlh->nlmsg_seq;
1455 c.pid = nlh->nlmsg_pid;
1456 c.data.aevent = XFRM_AE_CU;
1457 km_state_notify(x, &c);
1458 err = 0;
1459 out:
1460 xfrm_state_put(x);
1461 return err;
1462 }
1463
1464 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1465 struct rtattr **xfrma)
1466 {
1467 struct km_event c;
1468 u8 type = XFRM_POLICY_TYPE_MAIN;
1469 int err;
1470 struct xfrm_audit audit_info;
1471
1472 err = copy_from_user_policy_type(&type, xfrma);
1473 if (err)
1474 return err;
1475
1476 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1477 audit_info.secid = NETLINK_CB(skb).sid;
1478 xfrm_policy_flush(type, &audit_info);
1479 c.data.type = type;
1480 c.event = nlh->nlmsg_type;
1481 c.seq = nlh->nlmsg_seq;
1482 c.pid = nlh->nlmsg_pid;
1483 km_policy_notify(NULL, 0, &c);
1484 return 0;
1485 }
1486
1487 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1488 struct rtattr **xfrma)
1489 {
1490 struct xfrm_policy *xp;
1491 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1492 struct xfrm_userpolicy_info *p = &up->pol;
1493 u8 type = XFRM_POLICY_TYPE_MAIN;
1494 int err = -ENOENT;
1495
1496 err = copy_from_user_policy_type(&type, xfrma);
1497 if (err)
1498 return err;
1499
1500 if (p->index)
1501 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1502 else {
1503 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1504 struct xfrm_policy tmp;
1505
1506 err = verify_sec_ctx_len(xfrma);
1507 if (err)
1508 return err;
1509
1510 memset(&tmp, 0, sizeof(struct xfrm_policy));
1511 if (rt) {
1512 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1513
1514 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1515 return err;
1516 }
1517 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1518 0, &err);
1519 security_xfrm_policy_free(&tmp);
1520 }
1521
1522 if (xp == NULL)
1523 return -ENOENT;
1524 read_lock(&xp->lock);
1525 if (xp->dead) {
1526 read_unlock(&xp->lock);
1527 goto out;
1528 }
1529
1530 read_unlock(&xp->lock);
1531 err = 0;
1532 if (up->hard) {
1533 xfrm_policy_delete(xp, p->dir);
1534 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1535 AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);
1536
1537 } else {
1538 // reset the timers here?
1539 printk("Dont know what to do with soft policy expire\n");
1540 }
1541 km_policy_expired(xp, p->dir, up->hard, current->pid);
1542
1543 out:
1544 xfrm_pol_put(xp);
1545 return err;
1546 }
1547
1548 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1549 struct rtattr **xfrma)
1550 {
1551 struct xfrm_state *x;
1552 int err;
1553 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1554 struct xfrm_usersa_info *p = &ue->state;
1555
1556 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1557
1558 err = -ENOENT;
1559 if (x == NULL)
1560 return err;
1561
1562 spin_lock_bh(&x->lock);
1563 err = -EINVAL;
1564 if (x->km.state != XFRM_STATE_VALID)
1565 goto out;
1566 km_state_expired(x, ue->hard, current->pid);
1567
1568 if (ue->hard) {
1569 __xfrm_state_delete(x);
1570 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1571 AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
1572 }
1573 err = 0;
1574 out:
1575 spin_unlock_bh(&x->lock);
1576 xfrm_state_put(x);
1577 return err;
1578 }
1579
1580 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1581 struct rtattr **xfrma)
1582 {
1583 struct xfrm_policy *xp;
1584 struct xfrm_user_tmpl *ut;
1585 int i;
1586 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1587
1588 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1589 struct xfrm_state *x = xfrm_state_alloc();
1590 int err = -ENOMEM;
1591
1592 if (!x)
1593 return err;
1594
1595 err = verify_newpolicy_info(&ua->policy);
1596 if (err) {
1597 printk("BAD policy passed\n");
1598 kfree(x);
1599 return err;
1600 }
1601
1602 /* build an XP */
1603 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);
1604 if (!xp) {
1605 kfree(x);
1606 return err;
1607 }
1608
1609 memcpy(&x->id, &ua->id, sizeof(ua->id));
1610 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1611 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1612
1613 ut = RTA_DATA(rt);
1614 /* extract the templates and for each call km_key */
1615 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1616 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1617 memcpy(&x->id, &t->id, sizeof(x->id));
1618 x->props.mode = t->mode;
1619 x->props.reqid = t->reqid;
1620 x->props.family = ut->family;
1621 t->aalgos = ua->aalgos;
1622 t->ealgos = ua->ealgos;
1623 t->calgos = ua->calgos;
1624 err = km_query(x, t, xp);
1625
1626 }
1627
1628 kfree(x);
1629 kfree(xp);
1630
1631 return 0;
1632 }
1633
1634 #ifdef CONFIG_XFRM_MIGRATE
1635 static int verify_user_migrate(struct rtattr **xfrma)
1636 {
1637 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1638 struct xfrm_user_migrate *um;
1639
1640 if (!rt)
1641 return -EINVAL;
1642
1643 if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
1644 return -EINVAL;
1645
1646 return 0;
1647 }
1648
1649 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1650 struct rtattr **xfrma, int *num)
1651 {
1652 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1653 struct xfrm_user_migrate *um;
1654 int i, num_migrate;
1655
1656 um = RTA_DATA(rt);
1657 num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um);
1658
1659 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1660 return -EINVAL;
1661
1662 for (i = 0; i < num_migrate; i++, um++, ma++) {
1663 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1664 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1665 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1666 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1667
1668 ma->proto = um->proto;
1669 ma->mode = um->mode;
1670 ma->reqid = um->reqid;
1671
1672 ma->old_family = um->old_family;
1673 ma->new_family = um->new_family;
1674 }
1675
1676 *num = i;
1677 return 0;
1678 }
1679
1680 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1681 struct rtattr **xfrma)
1682 {
1683 struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh);
1684 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1685 u8 type;
1686 int err;
1687 int n = 0;
1688
1689 err = verify_user_migrate((struct rtattr **)xfrma);
1690 if (err)
1691 return err;
1692
1693 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1694 if (err)
1695 return err;
1696
1697 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1698 (struct rtattr **)xfrma, &n);
1699 if (err)
1700 return err;
1701
1702 if (!n)
1703 return 0;
1704
1705 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1706
1707 return 0;
1708 }
1709 #else
1710 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1711 struct rtattr **xfrma)
1712 {
1713 return -ENOPROTOOPT;
1714 }
1715 #endif
1716
1717 #ifdef CONFIG_XFRM_MIGRATE
1718 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1719 {
1720 struct xfrm_user_migrate um;
1721
1722 memset(&um, 0, sizeof(um));
1723 um.proto = m->proto;
1724 um.mode = m->mode;
1725 um.reqid = m->reqid;
1726 um.old_family = m->old_family;
1727 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1728 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1729 um.new_family = m->new_family;
1730 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1731 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1732
1733 RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
1734 return 0;
1735
1736 rtattr_failure:
1737 return -1;
1738 }
1739
1740 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1741 int num_migrate, struct xfrm_selector *sel,
1742 u8 dir, u8 type)
1743 {
1744 struct xfrm_migrate *mp;
1745 struct xfrm_userpolicy_id *pol_id;
1746 struct nlmsghdr *nlh;
1747 unsigned char *b = skb_tail_pointer(skb);
1748 int i;
1749
1750 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
1751 pol_id = NLMSG_DATA(nlh);
1752 nlh->nlmsg_flags = 0;
1753
1754 /* copy data from selector, dir, and type to the pol_id */
1755 memset(pol_id, 0, sizeof(*pol_id));
1756 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1757 pol_id->dir = dir;
1758
1759 if (copy_to_user_policy_type(type, skb) < 0)
1760 goto nlmsg_failure;
1761
1762 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1763 if (copy_to_user_migrate(mp, skb) < 0)
1764 goto nlmsg_failure;
1765 }
1766
1767 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1768 return skb->len;
1769 nlmsg_failure:
1770 nlmsg_trim(skb, b);
1771 return -1;
1772 }
1773
1774 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1775 struct xfrm_migrate *m, int num_migrate)
1776 {
1777 struct sk_buff *skb;
1778 size_t len;
1779
1780 len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
1781 len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
1782 #ifdef CONFIG_XFRM_SUB_POLICY
1783 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
1784 #endif
1785 skb = alloc_skb(len, GFP_ATOMIC);
1786 if (skb == NULL)
1787 return -ENOMEM;
1788
1789 /* build migrate */
1790 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1791 BUG();
1792
1793 NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
1794 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE,
1795 GFP_ATOMIC);
1796 }
1797 #else
1798 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1799 struct xfrm_migrate *m, int num_migrate)
1800 {
1801 return -ENOPROTOOPT;
1802 }
1803 #endif
1804
1805 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1806
1807 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1808 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1809 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1810 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1811 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1812 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1813 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1814 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1815 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1816 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1817 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1818 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1819 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1820 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1821 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1822 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1823 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1824 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1825 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1826 };
1827
1828 #undef XMSGSIZE
1829
1830 static struct xfrm_link {
1831 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
1832 int (*dump)(struct sk_buff *, struct netlink_callback *);
1833 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1834 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1835 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1836 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1837 .dump = xfrm_dump_sa },
1838 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1839 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1840 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1841 .dump = xfrm_dump_policy },
1842 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1843 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1844 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1845 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1846 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1847 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1848 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1849 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1850 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1851 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1852 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1853 };
1854
1855 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1856 {
1857 struct rtattr *xfrma[XFRMA_MAX];
1858 struct xfrm_link *link;
1859 int type, min_len, err;
1860
1861 type = nlh->nlmsg_type;
1862 if (type > XFRM_MSG_MAX)
1863 return -EINVAL;
1864
1865 type -= XFRM_MSG_BASE;
1866 link = &xfrm_dispatch[type];
1867
1868 /* All operations require privileges, even GET */
1869 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1870 return -EPERM;
1871
1872 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1873 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1874 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1875 if (link->dump == NULL)
1876 return -EINVAL;
1877
1878 err = netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
1879 if (err == 0)
1880 err = -EINTR;
1881 return err;
1882 }
1883
1884 memset(xfrma, 0, sizeof(xfrma));
1885
1886 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1887 return -EINVAL;
1888
1889 if (nlh->nlmsg_len > min_len) {
1890 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1891 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1892
1893 while (RTA_OK(attr, attrlen)) {
1894 unsigned short flavor = attr->rta_type;
1895 if (flavor) {
1896 if (flavor > XFRMA_MAX)
1897 return -EINVAL;
1898 xfrma[flavor - 1] = attr;
1899 }
1900 attr = RTA_NEXT(attr, attrlen);
1901 }
1902 }
1903
1904 if (link->doit == NULL)
1905 return -EINVAL;
1906
1907 return link->doit(skb, nlh, xfrma);
1908 }
1909
1910 static void xfrm_netlink_rcv(struct sock *sk, int len)
1911 {
1912 unsigned int qlen = 0;
1913
1914 do {
1915 mutex_lock(&xfrm_cfg_mutex);
1916 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
1917 mutex_unlock(&xfrm_cfg_mutex);
1918
1919 } while (qlen);
1920 }
1921
1922 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1923 {
1924 struct xfrm_user_expire *ue;
1925 struct nlmsghdr *nlh;
1926 unsigned char *b = skb_tail_pointer(skb);
1927
1928 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1929 sizeof(*ue));
1930 ue = NLMSG_DATA(nlh);
1931 nlh->nlmsg_flags = 0;
1932
1933 copy_to_user_state(x, &ue->state);
1934 ue->hard = (c->data.hard != 0) ? 1 : 0;
1935
1936 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1937 return skb->len;
1938
1939 nlmsg_failure:
1940 nlmsg_trim(skb, b);
1941 return -1;
1942 }
1943
1944 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1945 {
1946 struct sk_buff *skb;
1947 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1948
1949 skb = alloc_skb(len, GFP_ATOMIC);
1950 if (skb == NULL)
1951 return -ENOMEM;
1952
1953 if (build_expire(skb, x, c) < 0)
1954 BUG();
1955
1956 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1957 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1958 }
1959
1960 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1961 {
1962 struct sk_buff *skb;
1963 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1964
1965 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1966 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1967 skb = alloc_skb(len, GFP_ATOMIC);
1968 if (skb == NULL)
1969 return -ENOMEM;
1970
1971 if (build_aevent(skb, x, c) < 0)
1972 BUG();
1973
1974 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
1975 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1976 }
1977
1978 static int xfrm_notify_sa_flush(struct km_event *c)
1979 {
1980 struct xfrm_usersa_flush *p;
1981 struct nlmsghdr *nlh;
1982 struct sk_buff *skb;
1983 sk_buff_data_t b;
1984 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1985
1986 skb = alloc_skb(len, GFP_ATOMIC);
1987 if (skb == NULL)
1988 return -ENOMEM;
1989 b = skb->tail;
1990
1991 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1992 XFRM_MSG_FLUSHSA, sizeof(*p));
1993 nlh->nlmsg_flags = 0;
1994
1995 p = NLMSG_DATA(nlh);
1996 p->proto = c->data.proto;
1997
1998 nlh->nlmsg_len = skb->tail - b;
1999
2000 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2001 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2002
2003 nlmsg_failure:
2004 kfree_skb(skb);
2005 return -1;
2006 }
2007
2008 static inline int xfrm_sa_len(struct xfrm_state *x)
2009 {
2010 int l = 0;
2011 if (x->aalg)
2012 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
2013 if (x->ealg)
2014 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
2015 if (x->calg)
2016 l += RTA_SPACE(sizeof(*x->calg));
2017 if (x->encap)
2018 l += RTA_SPACE(sizeof(*x->encap));
2019
2020 return l;
2021 }
2022
2023 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2024 {
2025 struct xfrm_usersa_info *p;
2026 struct xfrm_usersa_id *id;
2027 struct nlmsghdr *nlh;
2028 struct sk_buff *skb;
2029 sk_buff_data_t b;
2030 int len = xfrm_sa_len(x);
2031 int headlen;
2032
2033 headlen = sizeof(*p);
2034 if (c->event == XFRM_MSG_DELSA) {
2035 len += RTA_SPACE(headlen);
2036 headlen = sizeof(*id);
2037 }
2038 len += NLMSG_SPACE(headlen);
2039
2040 skb = alloc_skb(len, GFP_ATOMIC);
2041 if (skb == NULL)
2042 return -ENOMEM;
2043 b = skb->tail;
2044
2045 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2046 nlh->nlmsg_flags = 0;
2047
2048 p = NLMSG_DATA(nlh);
2049 if (c->event == XFRM_MSG_DELSA) {
2050 id = NLMSG_DATA(nlh);
2051 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2052 id->spi = x->id.spi;
2053 id->family = x->props.family;
2054 id->proto = x->id.proto;
2055
2056 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
2057 }
2058
2059 copy_to_user_state(x, p);
2060
2061 if (x->aalg)
2062 RTA_PUT(skb, XFRMA_ALG_AUTH,
2063 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
2064 if (x->ealg)
2065 RTA_PUT(skb, XFRMA_ALG_CRYPT,
2066 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
2067 if (x->calg)
2068 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
2069
2070 if (x->encap)
2071 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
2072
2073 nlh->nlmsg_len = skb->tail - b;
2074
2075 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2076 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2077
2078 nlmsg_failure:
2079 rtattr_failure:
2080 kfree_skb(skb);
2081 return -1;
2082 }
2083
2084 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2085 {
2086
2087 switch (c->event) {
2088 case XFRM_MSG_EXPIRE:
2089 return xfrm_exp_state_notify(x, c);
2090 case XFRM_MSG_NEWAE:
2091 return xfrm_aevent_state_notify(x, c);
2092 case XFRM_MSG_DELSA:
2093 case XFRM_MSG_UPDSA:
2094 case XFRM_MSG_NEWSA:
2095 return xfrm_notify_sa(x, c);
2096 case XFRM_MSG_FLUSHSA:
2097 return xfrm_notify_sa_flush(c);
2098 default:
2099 printk("xfrm_user: Unknown SA event %d\n", c->event);
2100 break;
2101 }
2102
2103 return 0;
2104
2105 }
2106
2107 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2108 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2109 int dir)
2110 {
2111 struct xfrm_user_acquire *ua;
2112 struct nlmsghdr *nlh;
2113 unsigned char *b = skb_tail_pointer(skb);
2114 __u32 seq = xfrm_get_acqseq();
2115
2116 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
2117 sizeof(*ua));
2118 ua = NLMSG_DATA(nlh);
2119 nlh->nlmsg_flags = 0;
2120
2121 memcpy(&ua->id, &x->id, sizeof(ua->id));
2122 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2123 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2124 copy_to_user_policy(xp, &ua->policy, dir);
2125 ua->aalgos = xt->aalgos;
2126 ua->ealgos = xt->ealgos;
2127 ua->calgos = xt->calgos;
2128 ua->seq = x->km.seq = seq;
2129
2130 if (copy_to_user_tmpl(xp, skb) < 0)
2131 goto nlmsg_failure;
2132 if (copy_to_user_state_sec_ctx(x, skb))
2133 goto nlmsg_failure;
2134 if (copy_to_user_policy_type(xp->type, skb) < 0)
2135 goto nlmsg_failure;
2136
2137 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2138 return skb->len;
2139
2140 nlmsg_failure:
2141 nlmsg_trim(skb, b);
2142 return -1;
2143 }
2144
2145 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2146 struct xfrm_policy *xp, int dir)
2147 {
2148 struct sk_buff *skb;
2149 size_t len;
2150
2151 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2152 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
2153 len += RTA_SPACE(xfrm_user_sec_ctx_size(x->security));
2154 #ifdef CONFIG_XFRM_SUB_POLICY
2155 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2156 #endif
2157 skb = alloc_skb(len, GFP_ATOMIC);
2158 if (skb == NULL)
2159 return -ENOMEM;
2160
2161 if (build_acquire(skb, x, xt, xp, dir) < 0)
2162 BUG();
2163
2164 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
2165 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2166 }
2167
2168 /* User gives us xfrm_user_policy_info followed by an array of 0
2169 * or more templates.
2170 */
2171 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2172 u8 *data, int len, int *dir)
2173 {
2174 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2175 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2176 struct xfrm_policy *xp;
2177 int nr;
2178
2179 switch (sk->sk_family) {
2180 case AF_INET:
2181 if (opt != IP_XFRM_POLICY) {
2182 *dir = -EOPNOTSUPP;
2183 return NULL;
2184 }
2185 break;
2186 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2187 case AF_INET6:
2188 if (opt != IPV6_XFRM_POLICY) {
2189 *dir = -EOPNOTSUPP;
2190 return NULL;
2191 }
2192 break;
2193 #endif
2194 default:
2195 *dir = -EINVAL;
2196 return NULL;
2197 }
2198
2199 *dir = -EINVAL;
2200
2201 if (len < sizeof(*p) ||
2202 verify_newpolicy_info(p))
2203 return NULL;
2204
2205 nr = ((len - sizeof(*p)) / sizeof(*ut));
2206 if (validate_tmpl(nr, ut, p->sel.family))
2207 return NULL;
2208
2209 if (p->dir > XFRM_POLICY_OUT)
2210 return NULL;
2211
2212 xp = xfrm_policy_alloc(GFP_KERNEL);
2213 if (xp == NULL) {
2214 *dir = -ENOBUFS;
2215 return NULL;
2216 }
2217
2218 copy_from_user_policy(xp, p);
2219 xp->type = XFRM_POLICY_TYPE_MAIN;
2220 copy_templates(xp, ut, nr);
2221
2222 *dir = p->dir;
2223
2224 return xp;
2225 }
2226
2227 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2228 int dir, struct km_event *c)
2229 {
2230 struct xfrm_user_polexpire *upe;
2231 struct nlmsghdr *nlh;
2232 int hard = c->data.hard;
2233 unsigned char *b = skb_tail_pointer(skb);
2234
2235 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
2236 upe = NLMSG_DATA(nlh);
2237 nlh->nlmsg_flags = 0;
2238
2239 copy_to_user_policy(xp, &upe->pol, dir);
2240 if (copy_to_user_tmpl(xp, skb) < 0)
2241 goto nlmsg_failure;
2242 if (copy_to_user_sec_ctx(xp, skb))
2243 goto nlmsg_failure;
2244 if (copy_to_user_policy_type(xp->type, skb) < 0)
2245 goto nlmsg_failure;
2246 upe->hard = !!hard;
2247
2248 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2249 return skb->len;
2250
2251 nlmsg_failure:
2252 nlmsg_trim(skb, b);
2253 return -1;
2254 }
2255
2256 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2257 {
2258 struct sk_buff *skb;
2259 size_t len;
2260
2261 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2262 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2263 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp->security));
2264 #ifdef CONFIG_XFRM_SUB_POLICY
2265 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2266 #endif
2267 skb = alloc_skb(len, GFP_ATOMIC);
2268 if (skb == NULL)
2269 return -ENOMEM;
2270
2271 if (build_polexpire(skb, xp, dir, c) < 0)
2272 BUG();
2273
2274 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2275 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2276 }
2277
2278 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2279 {
2280 struct xfrm_userpolicy_info *p;
2281 struct xfrm_userpolicy_id *id;
2282 struct nlmsghdr *nlh;
2283 struct sk_buff *skb;
2284 sk_buff_data_t b;
2285 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2286 int headlen;
2287
2288 headlen = sizeof(*p);
2289 if (c->event == XFRM_MSG_DELPOLICY) {
2290 len += RTA_SPACE(headlen);
2291 headlen = sizeof(*id);
2292 }
2293 #ifdef CONFIG_XFRM_SUB_POLICY
2294 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2295 #endif
2296 len += NLMSG_SPACE(headlen);
2297
2298 skb = alloc_skb(len, GFP_ATOMIC);
2299 if (skb == NULL)
2300 return -ENOMEM;
2301 b = skb->tail;
2302
2303 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2304
2305 p = NLMSG_DATA(nlh);
2306 if (c->event == XFRM_MSG_DELPOLICY) {
2307 id = NLMSG_DATA(nlh);
2308 memset(id, 0, sizeof(*id));
2309 id->dir = dir;
2310 if (c->data.byid)
2311 id->index = xp->index;
2312 else
2313 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2314
2315 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2316 }
2317
2318 nlh->nlmsg_flags = 0;
2319
2320 copy_to_user_policy(xp, p, dir);
2321 if (copy_to_user_tmpl(xp, skb) < 0)
2322 goto nlmsg_failure;
2323 if (copy_to_user_policy_type(xp->type, skb) < 0)
2324 goto nlmsg_failure;
2325
2326 nlh->nlmsg_len = skb->tail - b;
2327
2328 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2329 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2330
2331 nlmsg_failure:
2332 rtattr_failure:
2333 kfree_skb(skb);
2334 return -1;
2335 }
2336
2337 static int xfrm_notify_policy_flush(struct km_event *c)
2338 {
2339 struct nlmsghdr *nlh;
2340 struct sk_buff *skb;
2341 sk_buff_data_t b;
2342 int len = 0;
2343 #ifdef CONFIG_XFRM_SUB_POLICY
2344 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2345 #endif
2346 len += NLMSG_LENGTH(0);
2347
2348 skb = alloc_skb(len, GFP_ATOMIC);
2349 if (skb == NULL)
2350 return -ENOMEM;
2351 b = skb->tail;
2352
2353
2354 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2355 nlh->nlmsg_flags = 0;
2356 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2357 goto nlmsg_failure;
2358
2359 nlh->nlmsg_len = skb->tail - b;
2360
2361 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2362 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2363
2364 nlmsg_failure:
2365 kfree_skb(skb);
2366 return -1;
2367 }
2368
2369 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2370 {
2371
2372 switch (c->event) {
2373 case XFRM_MSG_NEWPOLICY:
2374 case XFRM_MSG_UPDPOLICY:
2375 case XFRM_MSG_DELPOLICY:
2376 return xfrm_notify_policy(xp, dir, c);
2377 case XFRM_MSG_FLUSHPOLICY:
2378 return xfrm_notify_policy_flush(c);
2379 case XFRM_MSG_POLEXPIRE:
2380 return xfrm_exp_policy_notify(xp, dir, c);
2381 default:
2382 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2383 }
2384
2385 return 0;
2386
2387 }
2388
2389 static int build_report(struct sk_buff *skb, u8 proto,
2390 struct xfrm_selector *sel, xfrm_address_t *addr)
2391 {
2392 struct xfrm_user_report *ur;
2393 struct nlmsghdr *nlh;
2394 unsigned char *b = skb_tail_pointer(skb);
2395
2396 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2397 ur = NLMSG_DATA(nlh);
2398 nlh->nlmsg_flags = 0;
2399
2400 ur->proto = proto;
2401 memcpy(&ur->sel, sel, sizeof(ur->sel));
2402
2403 if (addr)
2404 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2405
2406 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2407 return skb->len;
2408
2409 nlmsg_failure:
2410 rtattr_failure:
2411 nlmsg_trim(skb, b);
2412 return -1;
2413 }
2414
2415 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2416 xfrm_address_t *addr)
2417 {
2418 struct sk_buff *skb;
2419 size_t len;
2420
2421 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2422 skb = alloc_skb(len, GFP_ATOMIC);
2423 if (skb == NULL)
2424 return -ENOMEM;
2425
2426 if (build_report(skb, proto, sel, addr) < 0)
2427 BUG();
2428
2429 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2430 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2431 }
2432
2433 static struct xfrm_mgr netlink_mgr = {
2434 .id = "netlink",
2435 .notify = xfrm_send_state_notify,
2436 .acquire = xfrm_send_acquire,
2437 .compile_policy = xfrm_compile_policy,
2438 .notify_policy = xfrm_send_policy_notify,
2439 .report = xfrm_send_report,
2440 .migrate = xfrm_send_migrate,
2441 };
2442
2443 static int __init xfrm_user_init(void)
2444 {
2445 struct sock *nlsk;
2446
2447 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2448
2449 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2450 xfrm_netlink_rcv, THIS_MODULE);
2451 if (nlsk == NULL)
2452 return -ENOMEM;
2453 rcu_assign_pointer(xfrm_nl, nlsk);
2454
2455 xfrm_register_km(&netlink_mgr);
2456
2457 return 0;
2458 }
2459
2460 static void __exit xfrm_user_exit(void)
2461 {
2462 struct sock *nlsk = xfrm_nl;
2463
2464 xfrm_unregister_km(&netlink_mgr);
2465 rcu_assign_pointer(xfrm_nl, NULL);
2466 synchronize_rcu();
2467 sock_release(nlsk->sk_socket);
2468 }
2469
2470 module_init(xfrm_user_init);
2471 module_exit(xfrm_user_exit);
2472 MODULE_LICENSE("GPL");
2473 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2474
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree