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[MIPS] VPE: Sprinkle device model code into code to make udev happier.
[linux-2.6/verdex.git] / net / xfrm / xfrm_user.c
blob079a5d3157592842847b6f4a823fcf9c7e477ffb
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_policy *xp)
276 {
277 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
278 int len = 0;
279
280 if (xfrm_ctx) {
281 len += sizeof(struct xfrm_user_sec_ctx);
282 len += xfrm_ctx->ctx_len;
283 }
284 return len;
285 }
286
287 static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
288 {
289 struct xfrm_user_sec_ctx *uctx;
290
291 if (!u_arg)
292 return 0;
293
294 uctx = RTA_DATA(u_arg);
295 return security_xfrm_state_alloc(x, uctx);
296 }
297
298 static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
299 {
300 struct rtattr *rta = u_arg;
301 xfrm_address_t *p, *uaddrp;
302
303 if (!rta)
304 return 0;
305
306 uaddrp = RTA_DATA(rta);
307 p = kmemdup(uaddrp, sizeof(*p), GFP_KERNEL);
308 if (!p)
309 return -ENOMEM;
310
311 *addrpp = p;
312 return 0;
313 }
314
315 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
316 {
317 memcpy(&x->id, &p->id, sizeof(x->id));
318 memcpy(&x->sel, &p->sel, sizeof(x->sel));
319 memcpy(&x->lft, &p->lft, sizeof(x->lft));
320 x->props.mode = p->mode;
321 x->props.replay_window = p->replay_window;
322 x->props.reqid = p->reqid;
323 x->props.family = p->family;
324 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
325 x->props.flags = p->flags;
326 }
327
328 /*
329 * someday when pfkey also has support, we could have the code
330 * somehow made shareable and move it to xfrm_state.c - JHS
331 *
332 */
333 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
334 {
335 int err = - EINVAL;
336 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
337 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
338 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
339 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
340
341 if (rp) {
342 struct xfrm_replay_state *replay;
343 if (RTA_PAYLOAD(rp) < sizeof(*replay))
344 goto error;
345 replay = RTA_DATA(rp);
346 memcpy(&x->replay, replay, sizeof(*replay));
347 memcpy(&x->preplay, replay, sizeof(*replay));
348 }
349
350 if (lt) {
351 struct xfrm_lifetime_cur *ltime;
352 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
353 goto error;
354 ltime = RTA_DATA(lt);
355 x->curlft.bytes = ltime->bytes;
356 x->curlft.packets = ltime->packets;
357 x->curlft.add_time = ltime->add_time;
358 x->curlft.use_time = ltime->use_time;
359 }
360
361 if (et) {
362 if (RTA_PAYLOAD(et) < sizeof(u32))
363 goto error;
364 x->replay_maxage = *(u32*)RTA_DATA(et);
365 }
366
367 if (rt) {
368 if (RTA_PAYLOAD(rt) < sizeof(u32))
369 goto error;
370 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
371 }
372
373 return 0;
374 error:
375 return err;
376 }
377
378 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
379 struct rtattr **xfrma,
380 int *errp)
381 {
382 struct xfrm_state *x = xfrm_state_alloc();
383 int err = -ENOMEM;
384
385 if (!x)
386 goto error_no_put;
387
388 copy_from_user_state(x, p);
389
390 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
391 xfrm_aalg_get_byname,
392 xfrma[XFRMA_ALG_AUTH-1])))
393 goto error;
394 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
395 xfrm_ealg_get_byname,
396 xfrma[XFRMA_ALG_CRYPT-1])))
397 goto error;
398 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
399 xfrm_calg_get_byname,
400 xfrma[XFRMA_ALG_COMP-1])))
401 goto error;
402 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
403 goto error;
404 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
405 goto error;
406 err = xfrm_init_state(x);
407 if (err)
408 goto error;
409
410 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
411 goto error;
412
413 x->km.seq = p->seq;
414 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
415 /* sysctl_xfrm_aevent_etime is in 100ms units */
416 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
417 x->preplay.bitmap = 0;
418 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
419 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
420
421 /* override default values from above */
422
423 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
424 if (err < 0)
425 goto error;
426
427 return x;
428
429 error:
430 x->km.state = XFRM_STATE_DEAD;
431 xfrm_state_put(x);
432 error_no_put:
433 *errp = err;
434 return NULL;
435 }
436
437 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
438 struct rtattr **xfrma)
439 {
440 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
441 struct xfrm_state *x;
442 int err;
443 struct km_event c;
444
445 err = verify_newsa_info(p, xfrma);
446 if (err)
447 return err;
448
449 x = xfrm_state_construct(p, xfrma, &err);
450 if (!x)
451 return err;
452
453 xfrm_state_hold(x);
454 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
455 err = xfrm_state_add(x);
456 else
457 err = xfrm_state_update(x);
458
459 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
460 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
461
462 if (err < 0) {
463 x->km.state = XFRM_STATE_DEAD;
464 __xfrm_state_put(x);
465 goto out;
466 }
467
468 c.seq = nlh->nlmsg_seq;
469 c.pid = nlh->nlmsg_pid;
470 c.event = nlh->nlmsg_type;
471
472 km_state_notify(x, &c);
473 out:
474 xfrm_state_put(x);
475 return err;
476 }
477
478 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
479 struct rtattr **xfrma,
480 int *errp)
481 {
482 struct xfrm_state *x = NULL;
483 int err;
484
485 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
486 err = -ESRCH;
487 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
488 } else {
489 xfrm_address_t *saddr = NULL;
490
491 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
492 if (err)
493 goto out;
494
495 if (!saddr) {
496 err = -EINVAL;
497 goto out;
498 }
499
500 err = -ESRCH;
501 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
502 p->family);
503 }
504
505 out:
506 if (!x && errp)
507 *errp = err;
508 return x;
509 }
510
511 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
512 struct rtattr **xfrma)
513 {
514 struct xfrm_state *x;
515 int err = -ESRCH;
516 struct km_event c;
517 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
518
519 x = xfrm_user_state_lookup(p, xfrma, &err);
520 if (x == NULL)
521 return err;
522
523 if ((err = security_xfrm_state_delete(x)) != 0)
524 goto out;
525
526 if (xfrm_state_kern(x)) {
527 err = -EPERM;
528 goto out;
529 }
530
531 err = xfrm_state_delete(x);
532
533 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
534 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
535
536 if (err < 0)
537 goto out;
538
539 c.seq = nlh->nlmsg_seq;
540 c.pid = nlh->nlmsg_pid;
541 c.event = nlh->nlmsg_type;
542 km_state_notify(x, &c);
543
544 out:
545 xfrm_state_put(x);
546 return err;
547 }
548
549 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
550 {
551 memcpy(&p->id, &x->id, sizeof(p->id));
552 memcpy(&p->sel, &x->sel, sizeof(p->sel));
553 memcpy(&p->lft, &x->lft, sizeof(p->lft));
554 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
555 memcpy(&p->stats, &x->stats, sizeof(p->stats));
556 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
557 p->mode = x->props.mode;
558 p->replay_window = x->props.replay_window;
559 p->reqid = x->props.reqid;
560 p->family = x->props.family;
561 p->flags = x->props.flags;
562 p->seq = x->km.seq;
563 }
564
565 struct xfrm_dump_info {
566 struct sk_buff *in_skb;
567 struct sk_buff *out_skb;
568 u32 nlmsg_seq;
569 u16 nlmsg_flags;
570 int start_idx;
571 int this_idx;
572 };
573
574 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
575 {
576 struct xfrm_dump_info *sp = ptr;
577 struct sk_buff *in_skb = sp->in_skb;
578 struct sk_buff *skb = sp->out_skb;
579 struct xfrm_usersa_info *p;
580 struct nlmsghdr *nlh;
581 unsigned char *b = skb->tail;
582
583 if (sp->this_idx < sp->start_idx)
584 goto out;
585
586 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
587 sp->nlmsg_seq,
588 XFRM_MSG_NEWSA, sizeof(*p));
589 nlh->nlmsg_flags = sp->nlmsg_flags;
590
591 p = NLMSG_DATA(nlh);
592 copy_to_user_state(x, p);
593
594 if (x->aalg)
595 RTA_PUT(skb, XFRMA_ALG_AUTH,
596 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
597 if (x->ealg)
598 RTA_PUT(skb, XFRMA_ALG_CRYPT,
599 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
600 if (x->calg)
601 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
602
603 if (x->encap)
604 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
605
606 if (x->security) {
607 int ctx_size = sizeof(struct xfrm_sec_ctx) +
608 x->security->ctx_len;
609 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
610 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
611
612 uctx->exttype = XFRMA_SEC_CTX;
613 uctx->len = ctx_size;
614 uctx->ctx_doi = x->security->ctx_doi;
615 uctx->ctx_alg = x->security->ctx_alg;
616 uctx->ctx_len = x->security->ctx_len;
617 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
618 }
619
620 if (x->coaddr)
621 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
622
623 if (x->lastused)
624 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
625
626 nlh->nlmsg_len = skb->tail - b;
627 out:
628 sp->this_idx++;
629 return 0;
630
631 nlmsg_failure:
632 rtattr_failure:
633 skb_trim(skb, b - skb->data);
634 return -1;
635 }
636
637 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
638 {
639 struct xfrm_dump_info info;
640
641 info.in_skb = cb->skb;
642 info.out_skb = skb;
643 info.nlmsg_seq = cb->nlh->nlmsg_seq;
644 info.nlmsg_flags = NLM_F_MULTI;
645 info.this_idx = 0;
646 info.start_idx = cb->args[0];
647 (void) xfrm_state_walk(0, dump_one_state, &info);
648 cb->args[0] = info.this_idx;
649
650 return skb->len;
651 }
652
653 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
654 struct xfrm_state *x, u32 seq)
655 {
656 struct xfrm_dump_info info;
657 struct sk_buff *skb;
658
659 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
660 if (!skb)
661 return ERR_PTR(-ENOMEM);
662
663 info.in_skb = in_skb;
664 info.out_skb = skb;
665 info.nlmsg_seq = seq;
666 info.nlmsg_flags = 0;
667 info.this_idx = info.start_idx = 0;
668
669 if (dump_one_state(x, 0, &info)) {
670 kfree_skb(skb);
671 return NULL;
672 }
673
674 return skb;
675 }
676
677 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
678 struct rtattr **xfrma)
679 {
680 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
681 struct xfrm_state *x;
682 struct sk_buff *resp_skb;
683 int err = -ESRCH;
684
685 x = xfrm_user_state_lookup(p, xfrma, &err);
686 if (x == NULL)
687 goto out_noput;
688
689 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
690 if (IS_ERR(resp_skb)) {
691 err = PTR_ERR(resp_skb);
692 } else {
693 err = netlink_unicast(xfrm_nl, resp_skb,
694 NETLINK_CB(skb).pid, MSG_DONTWAIT);
695 }
696 xfrm_state_put(x);
697 out_noput:
698 return err;
699 }
700
701 static int verify_userspi_info(struct xfrm_userspi_info *p)
702 {
703 switch (p->info.id.proto) {
704 case IPPROTO_AH:
705 case IPPROTO_ESP:
706 break;
707
708 case IPPROTO_COMP:
709 /* IPCOMP spi is 16-bits. */
710 if (p->max >= 0x10000)
711 return -EINVAL;
712 break;
713
714 default:
715 return -EINVAL;
716 };
717
718 if (p->min > p->max)
719 return -EINVAL;
720
721 return 0;
722 }
723
724 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
725 struct rtattr **xfrma)
726 {
727 struct xfrm_state *x;
728 struct xfrm_userspi_info *p;
729 struct sk_buff *resp_skb;
730 xfrm_address_t *daddr;
731 int family;
732 int err;
733
734 p = NLMSG_DATA(nlh);
735 err = verify_userspi_info(p);
736 if (err)
737 goto out_noput;
738
739 family = p->info.family;
740 daddr = &p->info.id.daddr;
741
742 x = NULL;
743 if (p->info.seq) {
744 x = xfrm_find_acq_byseq(p->info.seq);
745 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
746 xfrm_state_put(x);
747 x = NULL;
748 }
749 }
750
751 if (!x)
752 x = xfrm_find_acq(p->info.mode, p->info.reqid,
753 p->info.id.proto, daddr,
754 &p->info.saddr, 1,
755 family);
756 err = -ENOENT;
757 if (x == NULL)
758 goto out_noput;
759
760 resp_skb = ERR_PTR(-ENOENT);
761
762 spin_lock_bh(&x->lock);
763 if (x->km.state != XFRM_STATE_DEAD) {
764 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
765 if (x->id.spi)
766 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
767 }
768 spin_unlock_bh(&x->lock);
769
770 if (IS_ERR(resp_skb)) {
771 err = PTR_ERR(resp_skb);
772 goto out;
773 }
774
775 err = netlink_unicast(xfrm_nl, resp_skb,
776 NETLINK_CB(skb).pid, MSG_DONTWAIT);
777
778 out:
779 xfrm_state_put(x);
780 out_noput:
781 return err;
782 }
783
784 static int verify_policy_dir(u8 dir)
785 {
786 switch (dir) {
787 case XFRM_POLICY_IN:
788 case XFRM_POLICY_OUT:
789 case XFRM_POLICY_FWD:
790 break;
791
792 default:
793 return -EINVAL;
794 };
795
796 return 0;
797 }
798
799 static int verify_policy_type(u8 type)
800 {
801 switch (type) {
802 case XFRM_POLICY_TYPE_MAIN:
803 #ifdef CONFIG_XFRM_SUB_POLICY
804 case XFRM_POLICY_TYPE_SUB:
805 #endif
806 break;
807
808 default:
809 return -EINVAL;
810 };
811
812 return 0;
813 }
814
815 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
816 {
817 switch (p->share) {
818 case XFRM_SHARE_ANY:
819 case XFRM_SHARE_SESSION:
820 case XFRM_SHARE_USER:
821 case XFRM_SHARE_UNIQUE:
822 break;
823
824 default:
825 return -EINVAL;
826 };
827
828 switch (p->action) {
829 case XFRM_POLICY_ALLOW:
830 case XFRM_POLICY_BLOCK:
831 break;
832
833 default:
834 return -EINVAL;
835 };
836
837 switch (p->sel.family) {
838 case AF_INET:
839 break;
840
841 case AF_INET6:
842 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
843 break;
844 #else
845 return -EAFNOSUPPORT;
846 #endif
847
848 default:
849 return -EINVAL;
850 };
851
852 return verify_policy_dir(p->dir);
853 }
854
855 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
856 {
857 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
858 struct xfrm_user_sec_ctx *uctx;
859
860 if (!rt)
861 return 0;
862
863 uctx = RTA_DATA(rt);
864 return security_xfrm_policy_alloc(pol, uctx);
865 }
866
867 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
868 int nr)
869 {
870 int i;
871
872 xp->xfrm_nr = nr;
873 for (i = 0; i < nr; i++, ut++) {
874 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
875
876 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
877 memcpy(&t->saddr, &ut->saddr,
878 sizeof(xfrm_address_t));
879 t->reqid = ut->reqid;
880 t->mode = ut->mode;
881 t->share = ut->share;
882 t->optional = ut->optional;
883 t->aalgos = ut->aalgos;
884 t->ealgos = ut->ealgos;
885 t->calgos = ut->calgos;
886 t->encap_family = ut->family;
887 }
888 }
889
890 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
891 {
892 int i;
893
894 if (nr > XFRM_MAX_DEPTH)
895 return -EINVAL;
896
897 for (i = 0; i < nr; i++) {
898 /* We never validated the ut->family value, so many
899 * applications simply leave it at zero. The check was
900 * never made and ut->family was ignored because all
901 * templates could be assumed to have the same family as
902 * the policy itself. Now that we will have ipv4-in-ipv6
903 * and ipv6-in-ipv4 tunnels, this is no longer true.
904 */
905 if (!ut[i].family)
906 ut[i].family = family;
907
908 switch (ut[i].family) {
909 case AF_INET:
910 break;
911 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
912 case AF_INET6:
913 break;
914 #endif
915 default:
916 return -EINVAL;
917 };
918 }
919
920 return 0;
921 }
922
923 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
924 {
925 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
926
927 if (!rt) {
928 pol->xfrm_nr = 0;
929 } else {
930 struct xfrm_user_tmpl *utmpl = RTA_DATA(rt);
931 int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
932 int err;
933
934 err = validate_tmpl(nr, utmpl, pol->family);
935 if (err)
936 return err;
937
938 copy_templates(pol, RTA_DATA(rt), nr);
939 }
940 return 0;
941 }
942
943 static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
944 {
945 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
946 struct xfrm_userpolicy_type *upt;
947 u8 type = XFRM_POLICY_TYPE_MAIN;
948 int err;
949
950 if (rt) {
951 if (rt->rta_len < sizeof(*upt))
952 return -EINVAL;
953
954 upt = RTA_DATA(rt);
955 type = upt->type;
956 }
957
958 err = verify_policy_type(type);
959 if (err)
960 return err;
961
962 *tp = type;
963 return 0;
964 }
965
966 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
967 {
968 xp->priority = p->priority;
969 xp->index = p->index;
970 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
971 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
972 xp->action = p->action;
973 xp->flags = p->flags;
974 xp->family = p->sel.family;
975 /* XXX xp->share = p->share; */
976 }
977
978 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
979 {
980 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
981 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
982 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
983 p->priority = xp->priority;
984 p->index = xp->index;
985 p->sel.family = xp->family;
986 p->dir = dir;
987 p->action = xp->action;
988 p->flags = xp->flags;
989 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
990 }
991
992 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
993 {
994 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
995 int err;
996
997 if (!xp) {
998 *errp = -ENOMEM;
999 return NULL;
1000 }
1001
1002 copy_from_user_policy(xp, p);
1003
1004 err = copy_from_user_policy_type(&xp->type, xfrma);
1005 if (err)
1006 goto error;
1007
1008 if (!(err = copy_from_user_tmpl(xp, xfrma)))
1009 err = copy_from_user_sec_ctx(xp, xfrma);
1010 if (err)
1011 goto error;
1012
1013 return xp;
1014 error:
1015 *errp = err;
1016 kfree(xp);
1017 return NULL;
1018 }
1019
1020 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1021 struct rtattr **xfrma)
1022 {
1023 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
1024 struct xfrm_policy *xp;
1025 struct km_event c;
1026 int err;
1027 int excl;
1028
1029 err = verify_newpolicy_info(p);
1030 if (err)
1031 return err;
1032 err = verify_sec_ctx_len(xfrma);
1033 if (err)
1034 return err;
1035
1036 xp = xfrm_policy_construct(p, xfrma, &err);
1037 if (!xp)
1038 return err;
1039
1040 /* shouldnt excl be based on nlh flags??
1041 * Aha! this is anti-netlink really i.e more pfkey derived
1042 * in netlink excl is a flag and you wouldnt need
1043 * a type XFRM_MSG_UPDPOLICY - JHS */
1044 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1045 err = xfrm_policy_insert(p->dir, xp, excl);
1046 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1047 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1048
1049 if (err) {
1050 security_xfrm_policy_free(xp);
1051 kfree(xp);
1052 return err;
1053 }
1054
1055 c.event = nlh->nlmsg_type;
1056 c.seq = nlh->nlmsg_seq;
1057 c.pid = nlh->nlmsg_pid;
1058 km_policy_notify(xp, p->dir, &c);
1059
1060 xfrm_pol_put(xp);
1061
1062 return 0;
1063 }
1064
1065 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1066 {
1067 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1068 int i;
1069
1070 if (xp->xfrm_nr == 0)
1071 return 0;
1072
1073 for (i = 0; i < xp->xfrm_nr; i++) {
1074 struct xfrm_user_tmpl *up = &vec[i];
1075 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1076
1077 memcpy(&up->id, &kp->id, sizeof(up->id));
1078 up->family = kp->encap_family;
1079 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1080 up->reqid = kp->reqid;
1081 up->mode = kp->mode;
1082 up->share = kp->share;
1083 up->optional = kp->optional;
1084 up->aalgos = kp->aalgos;
1085 up->ealgos = kp->ealgos;
1086 up->calgos = kp->calgos;
1087 }
1088 RTA_PUT(skb, XFRMA_TMPL,
1089 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1090 vec);
1091
1092 return 0;
1093
1094 rtattr_failure:
1095 return -1;
1096 }
1097
1098 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1099 {
1100 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1101 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1102 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1103
1104 uctx->exttype = XFRMA_SEC_CTX;
1105 uctx->len = ctx_size;
1106 uctx->ctx_doi = s->ctx_doi;
1107 uctx->ctx_alg = s->ctx_alg;
1108 uctx->ctx_len = s->ctx_len;
1109 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1110 return 0;
1111
1112 rtattr_failure:
1113 return -1;
1114 }
1115
1116 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1117 {
1118 if (x->security) {
1119 return copy_sec_ctx(x->security, skb);
1120 }
1121 return 0;
1122 }
1123
1124 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1125 {
1126 if (xp->security) {
1127 return copy_sec_ctx(xp->security, skb);
1128 }
1129 return 0;
1130 }
1131
1132 #ifdef CONFIG_XFRM_SUB_POLICY
1133 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1134 {
1135 struct xfrm_userpolicy_type upt;
1136
1137 memset(&upt, 0, sizeof(upt));
1138 upt.type = type;
1139
1140 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1141
1142 return 0;
1143
1144 rtattr_failure:
1145 return -1;
1146 }
1147
1148 #else
1149 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1150 {
1151 return 0;
1152 }
1153 #endif
1154
1155 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1156 {
1157 struct xfrm_dump_info *sp = ptr;
1158 struct xfrm_userpolicy_info *p;
1159 struct sk_buff *in_skb = sp->in_skb;
1160 struct sk_buff *skb = sp->out_skb;
1161 struct nlmsghdr *nlh;
1162 unsigned char *b = skb->tail;
1163
1164 if (sp->this_idx < sp->start_idx)
1165 goto out;
1166
1167 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1168 sp->nlmsg_seq,
1169 XFRM_MSG_NEWPOLICY, sizeof(*p));
1170 p = NLMSG_DATA(nlh);
1171 nlh->nlmsg_flags = sp->nlmsg_flags;
1172
1173 copy_to_user_policy(xp, p, dir);
1174 if (copy_to_user_tmpl(xp, skb) < 0)
1175 goto nlmsg_failure;
1176 if (copy_to_user_sec_ctx(xp, skb))
1177 goto nlmsg_failure;
1178 if (copy_to_user_policy_type(xp->type, skb) < 0)
1179 goto nlmsg_failure;
1180
1181 nlh->nlmsg_len = skb->tail - b;
1182 out:
1183 sp->this_idx++;
1184 return 0;
1185
1186 nlmsg_failure:
1187 skb_trim(skb, b - skb->data);
1188 return -1;
1189 }
1190
1191 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1192 {
1193 struct xfrm_dump_info info;
1194
1195 info.in_skb = cb->skb;
1196 info.out_skb = skb;
1197 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1198 info.nlmsg_flags = NLM_F_MULTI;
1199 info.this_idx = 0;
1200 info.start_idx = cb->args[0];
1201 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1202 #ifdef CONFIG_XFRM_SUB_POLICY
1203 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1204 #endif
1205 cb->args[0] = info.this_idx;
1206
1207 return skb->len;
1208 }
1209
1210 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1211 struct xfrm_policy *xp,
1212 int dir, u32 seq)
1213 {
1214 struct xfrm_dump_info info;
1215 struct sk_buff *skb;
1216
1217 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1218 if (!skb)
1219 return ERR_PTR(-ENOMEM);
1220
1221 info.in_skb = in_skb;
1222 info.out_skb = skb;
1223 info.nlmsg_seq = seq;
1224 info.nlmsg_flags = 0;
1225 info.this_idx = info.start_idx = 0;
1226
1227 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1228 kfree_skb(skb);
1229 return NULL;
1230 }
1231
1232 return skb;
1233 }
1234
1235 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1236 struct rtattr **xfrma)
1237 {
1238 struct xfrm_policy *xp;
1239 struct xfrm_userpolicy_id *p;
1240 u8 type = XFRM_POLICY_TYPE_MAIN;
1241 int err;
1242 struct km_event c;
1243 int delete;
1244
1245 p = NLMSG_DATA(nlh);
1246 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1247
1248 err = copy_from_user_policy_type(&type, xfrma);
1249 if (err)
1250 return err;
1251
1252 err = verify_policy_dir(p->dir);
1253 if (err)
1254 return err;
1255
1256 if (p->index)
1257 xp = xfrm_policy_byid(type, p->dir, p->index, delete);
1258 else {
1259 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1260 struct xfrm_policy tmp;
1261
1262 err = verify_sec_ctx_len(xfrma);
1263 if (err)
1264 return err;
1265
1266 memset(&tmp, 0, sizeof(struct xfrm_policy));
1267 if (rt) {
1268 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1269
1270 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1271 return err;
1272 }
1273 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
1274 security_xfrm_policy_free(&tmp);
1275 }
1276 if (delete)
1277 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1278 AUDIT_MAC_IPSEC_DELSPD, (xp) ? 1 : 0, xp, NULL);
1279
1280 if (xp == NULL)
1281 return -ENOENT;
1282
1283 if (!delete) {
1284 struct sk_buff *resp_skb;
1285
1286 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1287 if (IS_ERR(resp_skb)) {
1288 err = PTR_ERR(resp_skb);
1289 } else {
1290 err = netlink_unicast(xfrm_nl, resp_skb,
1291 NETLINK_CB(skb).pid,
1292 MSG_DONTWAIT);
1293 }
1294 } else {
1295 if ((err = security_xfrm_policy_delete(xp)) != 0)
1296 goto out;
1297 c.data.byid = p->index;
1298 c.event = nlh->nlmsg_type;
1299 c.seq = nlh->nlmsg_seq;
1300 c.pid = nlh->nlmsg_pid;
1301 km_policy_notify(xp, p->dir, &c);
1302 }
1303
1304 xfrm_pol_put(xp);
1305
1306 out:
1307 return err;
1308 }
1309
1310 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1311 struct rtattr **xfrma)
1312 {
1313 struct km_event c;
1314 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1315 struct xfrm_audit audit_info;
1316
1317 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1318 audit_info.secid = NETLINK_CB(skb).sid;
1319 xfrm_state_flush(p->proto, &audit_info);
1320 c.data.proto = p->proto;
1321 c.event = nlh->nlmsg_type;
1322 c.seq = nlh->nlmsg_seq;
1323 c.pid = nlh->nlmsg_pid;
1324 km_state_notify(NULL, &c);
1325
1326 return 0;
1327 }
1328
1329
1330 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1331 {
1332 struct xfrm_aevent_id *id;
1333 struct nlmsghdr *nlh;
1334 struct xfrm_lifetime_cur ltime;
1335 unsigned char *b = skb->tail;
1336
1337 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1338 id = NLMSG_DATA(nlh);
1339 nlh->nlmsg_flags = 0;
1340
1341 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1342 id->sa_id.spi = x->id.spi;
1343 id->sa_id.family = x->props.family;
1344 id->sa_id.proto = x->id.proto;
1345 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1346 id->reqid = x->props.reqid;
1347 id->flags = c->data.aevent;
1348
1349 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1350
1351 ltime.bytes = x->curlft.bytes;
1352 ltime.packets = x->curlft.packets;
1353 ltime.add_time = x->curlft.add_time;
1354 ltime.use_time = x->curlft.use_time;
1355
1356 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1357
1358 if (id->flags&XFRM_AE_RTHR) {
1359 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1360 }
1361
1362 if (id->flags&XFRM_AE_ETHR) {
1363 u32 etimer = x->replay_maxage*10/HZ;
1364 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1365 }
1366
1367 nlh->nlmsg_len = skb->tail - b;
1368 return skb->len;
1369
1370 rtattr_failure:
1371 nlmsg_failure:
1372 skb_trim(skb, b - skb->data);
1373 return -1;
1374 }
1375
1376 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1377 struct rtattr **xfrma)
1378 {
1379 struct xfrm_state *x;
1380 struct sk_buff *r_skb;
1381 int err;
1382 struct km_event c;
1383 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1384 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1385 struct xfrm_usersa_id *id = &p->sa_id;
1386
1387 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1388 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1389
1390 if (p->flags&XFRM_AE_RTHR)
1391 len+=RTA_SPACE(sizeof(u32));
1392
1393 if (p->flags&XFRM_AE_ETHR)
1394 len+=RTA_SPACE(sizeof(u32));
1395
1396 r_skb = alloc_skb(len, GFP_ATOMIC);
1397 if (r_skb == NULL)
1398 return -ENOMEM;
1399
1400 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1401 if (x == NULL) {
1402 kfree(r_skb);
1403 return -ESRCH;
1404 }
1405
1406 /*
1407 * XXX: is this lock really needed - none of the other
1408 * gets lock (the concern is things getting updated
1409 * while we are still reading) - jhs
1410 */
1411 spin_lock_bh(&x->lock);
1412 c.data.aevent = p->flags;
1413 c.seq = nlh->nlmsg_seq;
1414 c.pid = nlh->nlmsg_pid;
1415
1416 if (build_aevent(r_skb, x, &c) < 0)
1417 BUG();
1418 err = netlink_unicast(xfrm_nl, r_skb,
1419 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1420 spin_unlock_bh(&x->lock);
1421 xfrm_state_put(x);
1422 return err;
1423 }
1424
1425 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1426 struct rtattr **xfrma)
1427 {
1428 struct xfrm_state *x;
1429 struct km_event c;
1430 int err = - EINVAL;
1431 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1432 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1433 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1434
1435 if (!lt && !rp)
1436 return err;
1437
1438 /* pedantic mode - thou shalt sayeth replaceth */
1439 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1440 return err;
1441
1442 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1443 if (x == NULL)
1444 return -ESRCH;
1445
1446 if (x->km.state != XFRM_STATE_VALID)
1447 goto out;
1448
1449 spin_lock_bh(&x->lock);
1450 err = xfrm_update_ae_params(x, xfrma);
1451 spin_unlock_bh(&x->lock);
1452 if (err < 0)
1453 goto out;
1454
1455 c.event = nlh->nlmsg_type;
1456 c.seq = nlh->nlmsg_seq;
1457 c.pid = nlh->nlmsg_pid;
1458 c.data.aevent = XFRM_AE_CU;
1459 km_state_notify(x, &c);
1460 err = 0;
1461 out:
1462 xfrm_state_put(x);
1463 return err;
1464 }
1465
1466 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1467 struct rtattr **xfrma)
1468 {
1469 struct km_event c;
1470 u8 type = XFRM_POLICY_TYPE_MAIN;
1471 int err;
1472 struct xfrm_audit audit_info;
1473
1474 err = copy_from_user_policy_type(&type, xfrma);
1475 if (err)
1476 return err;
1477
1478 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1479 audit_info.secid = NETLINK_CB(skb).sid;
1480 xfrm_policy_flush(type, &audit_info);
1481 c.data.type = type;
1482 c.event = nlh->nlmsg_type;
1483 c.seq = nlh->nlmsg_seq;
1484 c.pid = nlh->nlmsg_pid;
1485 km_policy_notify(NULL, 0, &c);
1486 return 0;
1487 }
1488
1489 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1490 struct rtattr **xfrma)
1491 {
1492 struct xfrm_policy *xp;
1493 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1494 struct xfrm_userpolicy_info *p = &up->pol;
1495 u8 type = XFRM_POLICY_TYPE_MAIN;
1496 int err = -ENOENT;
1497
1498 err = copy_from_user_policy_type(&type, xfrma);
1499 if (err)
1500 return err;
1501
1502 if (p->index)
1503 xp = xfrm_policy_byid(type, p->dir, p->index, 0);
1504 else {
1505 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1506 struct xfrm_policy tmp;
1507
1508 err = verify_sec_ctx_len(xfrma);
1509 if (err)
1510 return err;
1511
1512 memset(&tmp, 0, sizeof(struct xfrm_policy));
1513 if (rt) {
1514 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1515
1516 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1517 return err;
1518 }
1519 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0);
1520 security_xfrm_policy_free(&tmp);
1521 }
1522
1523 if (xp == NULL)
1524 return err;
1525 read_lock(&xp->lock);
1526 if (xp->dead) {
1527 read_unlock(&xp->lock);
1528 goto out;
1529 }
1530
1531 read_unlock(&xp->lock);
1532 err = 0;
1533 if (up->hard) {
1534 xfrm_policy_delete(xp, p->dir);
1535 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1536 AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);
1537
1538 } else {
1539 // reset the timers here?
1540 printk("Dont know what to do with soft policy expire\n");
1541 }
1542 km_policy_expired(xp, p->dir, up->hard, current->pid);
1543
1544 out:
1545 xfrm_pol_put(xp);
1546 return err;
1547 }
1548
1549 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1550 struct rtattr **xfrma)
1551 {
1552 struct xfrm_state *x;
1553 int err;
1554 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1555 struct xfrm_usersa_info *p = &ue->state;
1556
1557 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1558 err = -ENOENT;
1559
1560 if (x == NULL)
1561 return err;
1562
1563 err = -EINVAL;
1564
1565 spin_lock_bh(&x->lock);
1566 if (x->km.state != XFRM_STATE_VALID)
1567 goto out;
1568 km_state_expired(x, ue->hard, current->pid);
1569
1570 if (ue->hard) {
1571 __xfrm_state_delete(x);
1572 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1573 AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
1574 }
1575 out:
1576 spin_unlock_bh(&x->lock);
1577 xfrm_state_put(x);
1578 return err;
1579 }
1580
1581 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1582 struct rtattr **xfrma)
1583 {
1584 struct xfrm_policy *xp;
1585 struct xfrm_user_tmpl *ut;
1586 int i;
1587 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1588
1589 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1590 struct xfrm_state *x = xfrm_state_alloc();
1591 int err = -ENOMEM;
1592
1593 if (!x)
1594 return err;
1595
1596 err = verify_newpolicy_info(&ua->policy);
1597 if (err) {
1598 printk("BAD policy passed\n");
1599 kfree(x);
1600 return err;
1601 }
1602
1603 /* build an XP */
1604 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);
1605 if (!xp) {
1606 kfree(x);
1607 return err;
1608 }
1609
1610 memcpy(&x->id, &ua->id, sizeof(ua->id));
1611 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1612 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1613
1614 ut = RTA_DATA(rt);
1615 /* extract the templates and for each call km_key */
1616 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1617 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1618 memcpy(&x->id, &t->id, sizeof(x->id));
1619 x->props.mode = t->mode;
1620 x->props.reqid = t->reqid;
1621 x->props.family = ut->family;
1622 t->aalgos = ua->aalgos;
1623 t->ealgos = ua->ealgos;
1624 t->calgos = ua->calgos;
1625 err = km_query(x, t, xp);
1626
1627 }
1628
1629 kfree(x);
1630 kfree(xp);
1631
1632 return 0;
1633 }
1634
1635 #ifdef CONFIG_XFRM_MIGRATE
1636 static int verify_user_migrate(struct rtattr **xfrma)
1637 {
1638 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1639 struct xfrm_user_migrate *um;
1640
1641 if (!rt)
1642 return -EINVAL;
1643
1644 if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
1645 return -EINVAL;
1646
1647 return 0;
1648 }
1649
1650 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1651 struct rtattr **xfrma, int *num)
1652 {
1653 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1654 struct xfrm_user_migrate *um;
1655 int i, num_migrate;
1656
1657 um = RTA_DATA(rt);
1658 num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um);
1659
1660 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1661 return -EINVAL;
1662
1663 for (i = 0; i < num_migrate; i++, um++, ma++) {
1664 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1665 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1666 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1667 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1668
1669 ma->proto = um->proto;
1670 ma->mode = um->mode;
1671 ma->reqid = um->reqid;
1672
1673 ma->old_family = um->old_family;
1674 ma->new_family = um->new_family;
1675 }
1676
1677 *num = i;
1678 return 0;
1679 }
1680
1681 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1682 struct rtattr **xfrma)
1683 {
1684 struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh);
1685 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1686 u8 type;
1687 int err;
1688 int n = 0;
1689
1690 err = verify_user_migrate((struct rtattr **)xfrma);
1691 if (err)
1692 return err;
1693
1694 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1695 if (err)
1696 return err;
1697
1698 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1699 (struct rtattr **)xfrma, &n);
1700 if (err)
1701 return err;
1702
1703 if (!n)
1704 return 0;
1705
1706 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1707
1708 return 0;
1709 }
1710 #else
1711 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1712 struct rtattr **xfrma)
1713 {
1714 return -ENOPROTOOPT;
1715 }
1716 #endif
1717
1718 #ifdef CONFIG_XFRM_MIGRATE
1719 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1720 {
1721 struct xfrm_user_migrate um;
1722
1723 memset(&um, 0, sizeof(um));
1724 um.proto = m->proto;
1725 um.mode = m->mode;
1726 um.reqid = m->reqid;
1727 um.old_family = m->old_family;
1728 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1729 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1730 um.new_family = m->new_family;
1731 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1732 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1733
1734 RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
1735 return 0;
1736
1737 rtattr_failure:
1738 return -1;
1739 }
1740
1741 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1742 int num_migrate, struct xfrm_selector *sel,
1743 u8 dir, u8 type)
1744 {
1745 struct xfrm_migrate *mp;
1746 struct xfrm_userpolicy_id *pol_id;
1747 struct nlmsghdr *nlh;
1748 unsigned char *b = skb->tail;
1749 int i;
1750
1751 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
1752 pol_id = NLMSG_DATA(nlh);
1753 nlh->nlmsg_flags = 0;
1754
1755 /* copy data from selector, dir, and type to the pol_id */
1756 memset(pol_id, 0, sizeof(*pol_id));
1757 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1758 pol_id->dir = dir;
1759
1760 if (copy_to_user_policy_type(type, skb) < 0)
1761 goto nlmsg_failure;
1762
1763 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1764 if (copy_to_user_migrate(mp, skb) < 0)
1765 goto nlmsg_failure;
1766 }
1767
1768 nlh->nlmsg_len = skb->tail - b;
1769 return skb->len;
1770 nlmsg_failure:
1771 skb_trim(skb, b - skb->data);
1772 return -1;
1773 }
1774
1775 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1776 struct xfrm_migrate *m, int num_migrate)
1777 {
1778 struct sk_buff *skb;
1779 size_t len;
1780
1781 len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
1782 len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
1783 #ifdef CONFIG_XFRM_SUB_POLICY
1784 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
1785 #endif
1786 skb = alloc_skb(len, GFP_ATOMIC);
1787 if (skb == NULL)
1788 return -ENOMEM;
1789
1790 /* build migrate */
1791 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1792 BUG();
1793
1794 NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
1795 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE,
1796 GFP_ATOMIC);
1797 }
1798 #else
1799 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1800 struct xfrm_migrate *m, int num_migrate)
1801 {
1802 return -ENOPROTOOPT;
1803 }
1804 #endif
1805
1806 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1807
1808 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1809 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1810 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1811 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1812 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1813 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1814 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1815 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1816 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1817 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1818 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1819 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1820 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1821 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1822 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1823 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1824 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1825 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1826 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1827 };
1828
1829 #undef XMSGSIZE
1830
1831 static struct xfrm_link {
1832 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
1833 int (*dump)(struct sk_buff *, struct netlink_callback *);
1834 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1835 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1836 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1837 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1838 .dump = xfrm_dump_sa },
1839 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1840 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1841 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1842 .dump = xfrm_dump_policy },
1843 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1844 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1845 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1846 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1847 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1848 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1849 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1850 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1851 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1852 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1853 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1854 };
1855
1856 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
1857 {
1858 struct rtattr *xfrma[XFRMA_MAX];
1859 struct xfrm_link *link;
1860 int type, min_len;
1861
1862 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
1863 return 0;
1864
1865 type = nlh->nlmsg_type;
1866
1867 /* A control message: ignore them */
1868 if (type < XFRM_MSG_BASE)
1869 return 0;
1870
1871 /* Unknown message: reply with EINVAL */
1872 if (type > XFRM_MSG_MAX)
1873 goto err_einval;
1874
1875 type -= XFRM_MSG_BASE;
1876 link = &xfrm_dispatch[type];
1877
1878 /* All operations require privileges, even GET */
1879 if (security_netlink_recv(skb, CAP_NET_ADMIN)) {
1880 *errp = -EPERM;
1881 return -1;
1882 }
1883
1884 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1885 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1886 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1887 if (link->dump == NULL)
1888 goto err_einval;
1889
1890 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
1891 link->dump, NULL)) != 0) {
1892 return -1;
1893 }
1894
1895 netlink_queue_skip(nlh, skb);
1896 return -1;
1897 }
1898
1899 memset(xfrma, 0, sizeof(xfrma));
1900
1901 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1902 goto err_einval;
1903
1904 if (nlh->nlmsg_len > min_len) {
1905 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1906 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1907
1908 while (RTA_OK(attr, attrlen)) {
1909 unsigned short flavor = attr->rta_type;
1910 if (flavor) {
1911 if (flavor > XFRMA_MAX)
1912 goto err_einval;
1913 xfrma[flavor - 1] = attr;
1914 }
1915 attr = RTA_NEXT(attr, attrlen);
1916 }
1917 }
1918
1919 if (link->doit == NULL)
1920 goto err_einval;
1921 *errp = link->doit(skb, nlh, xfrma);
1922
1923 return *errp;
1924
1925 err_einval:
1926 *errp = -EINVAL;
1927 return -1;
1928 }
1929
1930 static void xfrm_netlink_rcv(struct sock *sk, int len)
1931 {
1932 unsigned int qlen = 0;
1933
1934 do {
1935 mutex_lock(&xfrm_cfg_mutex);
1936 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
1937 mutex_unlock(&xfrm_cfg_mutex);
1938
1939 } while (qlen);
1940 }
1941
1942 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1943 {
1944 struct xfrm_user_expire *ue;
1945 struct nlmsghdr *nlh;
1946 unsigned char *b = skb->tail;
1947
1948 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1949 sizeof(*ue));
1950 ue = NLMSG_DATA(nlh);
1951 nlh->nlmsg_flags = 0;
1952
1953 copy_to_user_state(x, &ue->state);
1954 ue->hard = (c->data.hard != 0) ? 1 : 0;
1955
1956 nlh->nlmsg_len = skb->tail - b;
1957 return skb->len;
1958
1959 nlmsg_failure:
1960 skb_trim(skb, b - skb->data);
1961 return -1;
1962 }
1963
1964 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1965 {
1966 struct sk_buff *skb;
1967 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1968
1969 skb = alloc_skb(len, GFP_ATOMIC);
1970 if (skb == NULL)
1971 return -ENOMEM;
1972
1973 if (build_expire(skb, x, c) < 0)
1974 BUG();
1975
1976 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1977 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1978 }
1979
1980 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1981 {
1982 struct sk_buff *skb;
1983 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1984
1985 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1986 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1987 skb = alloc_skb(len, GFP_ATOMIC);
1988 if (skb == NULL)
1989 return -ENOMEM;
1990
1991 if (build_aevent(skb, x, c) < 0)
1992 BUG();
1993
1994 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
1995 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1996 }
1997
1998 static int xfrm_notify_sa_flush(struct km_event *c)
1999 {
2000 struct xfrm_usersa_flush *p;
2001 struct nlmsghdr *nlh;
2002 struct sk_buff *skb;
2003 unsigned char *b;
2004 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
2005
2006 skb = alloc_skb(len, GFP_ATOMIC);
2007 if (skb == NULL)
2008 return -ENOMEM;
2009 b = skb->tail;
2010
2011 nlh = NLMSG_PUT(skb, c->pid, c->seq,
2012 XFRM_MSG_FLUSHSA, sizeof(*p));
2013 nlh->nlmsg_flags = 0;
2014
2015 p = NLMSG_DATA(nlh);
2016 p->proto = c->data.proto;
2017
2018 nlh->nlmsg_len = skb->tail - b;
2019
2020 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2021 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2022
2023 nlmsg_failure:
2024 kfree_skb(skb);
2025 return -1;
2026 }
2027
2028 static int inline xfrm_sa_len(struct xfrm_state *x)
2029 {
2030 int l = 0;
2031 if (x->aalg)
2032 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
2033 if (x->ealg)
2034 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
2035 if (x->calg)
2036 l += RTA_SPACE(sizeof(*x->calg));
2037 if (x->encap)
2038 l += RTA_SPACE(sizeof(*x->encap));
2039
2040 return l;
2041 }
2042
2043 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2044 {
2045 struct xfrm_usersa_info *p;
2046 struct xfrm_usersa_id *id;
2047 struct nlmsghdr *nlh;
2048 struct sk_buff *skb;
2049 unsigned char *b;
2050 int len = xfrm_sa_len(x);
2051 int headlen;
2052
2053 headlen = sizeof(*p);
2054 if (c->event == XFRM_MSG_DELSA) {
2055 len += RTA_SPACE(headlen);
2056 headlen = sizeof(*id);
2057 }
2058 len += NLMSG_SPACE(headlen);
2059
2060 skb = alloc_skb(len, GFP_ATOMIC);
2061 if (skb == NULL)
2062 return -ENOMEM;
2063 b = skb->tail;
2064
2065 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2066 nlh->nlmsg_flags = 0;
2067
2068 p = NLMSG_DATA(nlh);
2069 if (c->event == XFRM_MSG_DELSA) {
2070 id = NLMSG_DATA(nlh);
2071 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2072 id->spi = x->id.spi;
2073 id->family = x->props.family;
2074 id->proto = x->id.proto;
2075
2076 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
2077 }
2078
2079 copy_to_user_state(x, p);
2080
2081 if (x->aalg)
2082 RTA_PUT(skb, XFRMA_ALG_AUTH,
2083 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
2084 if (x->ealg)
2085 RTA_PUT(skb, XFRMA_ALG_CRYPT,
2086 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
2087 if (x->calg)
2088 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
2089
2090 if (x->encap)
2091 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
2092
2093 nlh->nlmsg_len = skb->tail - b;
2094
2095 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2096 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2097
2098 nlmsg_failure:
2099 rtattr_failure:
2100 kfree_skb(skb);
2101 return -1;
2102 }
2103
2104 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2105 {
2106
2107 switch (c->event) {
2108 case XFRM_MSG_EXPIRE:
2109 return xfrm_exp_state_notify(x, c);
2110 case XFRM_MSG_NEWAE:
2111 return xfrm_aevent_state_notify(x, c);
2112 case XFRM_MSG_DELSA:
2113 case XFRM_MSG_UPDSA:
2114 case XFRM_MSG_NEWSA:
2115 return xfrm_notify_sa(x, c);
2116 case XFRM_MSG_FLUSHSA:
2117 return xfrm_notify_sa_flush(c);
2118 default:
2119 printk("xfrm_user: Unknown SA event %d\n", c->event);
2120 break;
2121 }
2122
2123 return 0;
2124
2125 }
2126
2127 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2128 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2129 int dir)
2130 {
2131 struct xfrm_user_acquire *ua;
2132 struct nlmsghdr *nlh;
2133 unsigned char *b = skb->tail;
2134 __u32 seq = xfrm_get_acqseq();
2135
2136 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
2137 sizeof(*ua));
2138 ua = NLMSG_DATA(nlh);
2139 nlh->nlmsg_flags = 0;
2140
2141 memcpy(&ua->id, &x->id, sizeof(ua->id));
2142 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2143 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2144 copy_to_user_policy(xp, &ua->policy, dir);
2145 ua->aalgos = xt->aalgos;
2146 ua->ealgos = xt->ealgos;
2147 ua->calgos = xt->calgos;
2148 ua->seq = x->km.seq = seq;
2149
2150 if (copy_to_user_tmpl(xp, skb) < 0)
2151 goto nlmsg_failure;
2152 if (copy_to_user_state_sec_ctx(x, skb))
2153 goto nlmsg_failure;
2154 if (copy_to_user_policy_type(xp->type, skb) < 0)
2155 goto nlmsg_failure;
2156
2157 nlh->nlmsg_len = skb->tail - b;
2158 return skb->len;
2159
2160 nlmsg_failure:
2161 skb_trim(skb, b - skb->data);
2162 return -1;
2163 }
2164
2165 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2166 struct xfrm_policy *xp, int dir)
2167 {
2168 struct sk_buff *skb;
2169 size_t len;
2170
2171 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2172 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
2173 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
2174 #ifdef CONFIG_XFRM_SUB_POLICY
2175 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2176 #endif
2177 skb = alloc_skb(len, GFP_ATOMIC);
2178 if (skb == NULL)
2179 return -ENOMEM;
2180
2181 if (build_acquire(skb, x, xt, xp, dir) < 0)
2182 BUG();
2183
2184 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
2185 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2186 }
2187
2188 /* User gives us xfrm_user_policy_info followed by an array of 0
2189 * or more templates.
2190 */
2191 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2192 u8 *data, int len, int *dir)
2193 {
2194 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2195 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2196 struct xfrm_policy *xp;
2197 int nr;
2198
2199 switch (sk->sk_family) {
2200 case AF_INET:
2201 if (opt != IP_XFRM_POLICY) {
2202 *dir = -EOPNOTSUPP;
2203 return NULL;
2204 }
2205 break;
2206 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2207 case AF_INET6:
2208 if (opt != IPV6_XFRM_POLICY) {
2209 *dir = -EOPNOTSUPP;
2210 return NULL;
2211 }
2212 break;
2213 #endif
2214 default:
2215 *dir = -EINVAL;
2216 return NULL;
2217 }
2218
2219 *dir = -EINVAL;
2220
2221 if (len < sizeof(*p) ||
2222 verify_newpolicy_info(p))
2223 return NULL;
2224
2225 nr = ((len - sizeof(*p)) / sizeof(*ut));
2226 if (validate_tmpl(nr, ut, p->sel.family))
2227 return NULL;
2228
2229 if (p->dir > XFRM_POLICY_OUT)
2230 return NULL;
2231
2232 xp = xfrm_policy_alloc(GFP_KERNEL);
2233 if (xp == NULL) {
2234 *dir = -ENOBUFS;
2235 return NULL;
2236 }
2237
2238 copy_from_user_policy(xp, p);
2239 xp->type = XFRM_POLICY_TYPE_MAIN;
2240 copy_templates(xp, ut, nr);
2241
2242 *dir = p->dir;
2243
2244 return xp;
2245 }
2246
2247 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2248 int dir, struct km_event *c)
2249 {
2250 struct xfrm_user_polexpire *upe;
2251 struct nlmsghdr *nlh;
2252 int hard = c->data.hard;
2253 unsigned char *b = skb->tail;
2254
2255 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
2256 upe = NLMSG_DATA(nlh);
2257 nlh->nlmsg_flags = 0;
2258
2259 copy_to_user_policy(xp, &upe->pol, dir);
2260 if (copy_to_user_tmpl(xp, skb) < 0)
2261 goto nlmsg_failure;
2262 if (copy_to_user_sec_ctx(xp, skb))
2263 goto nlmsg_failure;
2264 if (copy_to_user_policy_type(xp->type, skb) < 0)
2265 goto nlmsg_failure;
2266 upe->hard = !!hard;
2267
2268 nlh->nlmsg_len = skb->tail - b;
2269 return skb->len;
2270
2271 nlmsg_failure:
2272 skb_trim(skb, b - skb->data);
2273 return -1;
2274 }
2275
2276 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2277 {
2278 struct sk_buff *skb;
2279 size_t len;
2280
2281 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2282 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2283 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
2284 #ifdef CONFIG_XFRM_SUB_POLICY
2285 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2286 #endif
2287 skb = alloc_skb(len, GFP_ATOMIC);
2288 if (skb == NULL)
2289 return -ENOMEM;
2290
2291 if (build_polexpire(skb, xp, dir, c) < 0)
2292 BUG();
2293
2294 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2295 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2296 }
2297
2298 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2299 {
2300 struct xfrm_userpolicy_info *p;
2301 struct xfrm_userpolicy_id *id;
2302 struct nlmsghdr *nlh;
2303 struct sk_buff *skb;
2304 unsigned char *b;
2305 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2306 int headlen;
2307
2308 headlen = sizeof(*p);
2309 if (c->event == XFRM_MSG_DELPOLICY) {
2310 len += RTA_SPACE(headlen);
2311 headlen = sizeof(*id);
2312 }
2313 #ifdef CONFIG_XFRM_SUB_POLICY
2314 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2315 #endif
2316 len += NLMSG_SPACE(headlen);
2317
2318 skb = alloc_skb(len, GFP_ATOMIC);
2319 if (skb == NULL)
2320 return -ENOMEM;
2321 b = skb->tail;
2322
2323 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2324
2325 p = NLMSG_DATA(nlh);
2326 if (c->event == XFRM_MSG_DELPOLICY) {
2327 id = NLMSG_DATA(nlh);
2328 memset(id, 0, sizeof(*id));
2329 id->dir = dir;
2330 if (c->data.byid)
2331 id->index = xp->index;
2332 else
2333 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2334
2335 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2336 }
2337
2338 nlh->nlmsg_flags = 0;
2339
2340 copy_to_user_policy(xp, p, dir);
2341 if (copy_to_user_tmpl(xp, skb) < 0)
2342 goto nlmsg_failure;
2343 if (copy_to_user_policy_type(xp->type, skb) < 0)
2344 goto nlmsg_failure;
2345
2346 nlh->nlmsg_len = skb->tail - b;
2347
2348 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2349 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2350
2351 nlmsg_failure:
2352 rtattr_failure:
2353 kfree_skb(skb);
2354 return -1;
2355 }
2356
2357 static int xfrm_notify_policy_flush(struct km_event *c)
2358 {
2359 struct nlmsghdr *nlh;
2360 struct sk_buff *skb;
2361 unsigned char *b;
2362 int len = 0;
2363 #ifdef CONFIG_XFRM_SUB_POLICY
2364 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2365 #endif
2366 len += NLMSG_LENGTH(0);
2367
2368 skb = alloc_skb(len, GFP_ATOMIC);
2369 if (skb == NULL)
2370 return -ENOMEM;
2371 b = skb->tail;
2372
2373
2374 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2375 nlh->nlmsg_flags = 0;
2376 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2377 goto nlmsg_failure;
2378
2379 nlh->nlmsg_len = skb->tail - b;
2380
2381 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2382 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2383
2384 nlmsg_failure:
2385 kfree_skb(skb);
2386 return -1;
2387 }
2388
2389 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2390 {
2391
2392 switch (c->event) {
2393 case XFRM_MSG_NEWPOLICY:
2394 case XFRM_MSG_UPDPOLICY:
2395 case XFRM_MSG_DELPOLICY:
2396 return xfrm_notify_policy(xp, dir, c);
2397 case XFRM_MSG_FLUSHPOLICY:
2398 return xfrm_notify_policy_flush(c);
2399 case XFRM_MSG_POLEXPIRE:
2400 return xfrm_exp_policy_notify(xp, dir, c);
2401 default:
2402 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2403 }
2404
2405 return 0;
2406
2407 }
2408
2409 static int build_report(struct sk_buff *skb, u8 proto,
2410 struct xfrm_selector *sel, xfrm_address_t *addr)
2411 {
2412 struct xfrm_user_report *ur;
2413 struct nlmsghdr *nlh;
2414 unsigned char *b = skb->tail;
2415
2416 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2417 ur = NLMSG_DATA(nlh);
2418 nlh->nlmsg_flags = 0;
2419
2420 ur->proto = proto;
2421 memcpy(&ur->sel, sel, sizeof(ur->sel));
2422
2423 if (addr)
2424 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2425
2426 nlh->nlmsg_len = skb->tail - b;
2427 return skb->len;
2428
2429 nlmsg_failure:
2430 rtattr_failure:
2431 skb_trim(skb, b - skb->data);
2432 return -1;
2433 }
2434
2435 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2436 xfrm_address_t *addr)
2437 {
2438 struct sk_buff *skb;
2439 size_t len;
2440
2441 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2442 skb = alloc_skb(len, GFP_ATOMIC);
2443 if (skb == NULL)
2444 return -ENOMEM;
2445
2446 if (build_report(skb, proto, sel, addr) < 0)
2447 BUG();
2448
2449 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2450 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2451 }
2452
2453 static struct xfrm_mgr netlink_mgr = {
2454 .id = "netlink",
2455 .notify = xfrm_send_state_notify,
2456 .acquire = xfrm_send_acquire,
2457 .compile_policy = xfrm_compile_policy,
2458 .notify_policy = xfrm_send_policy_notify,
2459 .report = xfrm_send_report,
2460 .migrate = xfrm_send_migrate,
2461 };
2462
2463 static int __init xfrm_user_init(void)
2464 {
2465 struct sock *nlsk;
2466
2467 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2468
2469 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2470 xfrm_netlink_rcv, THIS_MODULE);
2471 if (nlsk == NULL)
2472 return -ENOMEM;
2473 rcu_assign_pointer(xfrm_nl, nlsk);
2474
2475 xfrm_register_km(&netlink_mgr);
2476
2477 return 0;
2478 }
2479
2480 static void __exit xfrm_user_exit(void)
2481 {
2482 struct sock *nlsk = xfrm_nl;
2483
2484 xfrm_unregister_km(&netlink_mgr);
2485 rcu_assign_pointer(xfrm_nl, NULL);
2486 synchronize_rcu();
2487 sock_release(nlsk->sk_socket);
2488 }
2489
2490 module_init(xfrm_user_init);
2491 module_exit(xfrm_user_exit);
2492 MODULE_LICENSE("GPL");
2493 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2494
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