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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / xfrm / xfrm_user.c
blobba59983aaffee6e3d7f7a0afb241f92d787b152d
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/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <asm/uaccess.h>
30 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
31 #include <linux/in6.h>
32 #endif
33
34 static inline int aead_len(struct xfrm_algo_aead *alg)
35 {
36 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
37 }
38
39 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
40 {
41 struct nlattr *rt = attrs[type];
42 struct xfrm_algo *algp;
43
44 if (!rt)
45 return 0;
46
47 algp = nla_data(rt);
48 if (nla_len(rt) < xfrm_alg_len(algp))
49 return -EINVAL;
50
51 switch (type) {
52 case XFRMA_ALG_AUTH:
53 case XFRMA_ALG_CRYPT:
54 case XFRMA_ALG_COMP:
55 break;
56
57 default:
58 return -EINVAL;
59 }
60
61 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
62 return 0;
63 }
64
65 static int verify_auth_trunc(struct nlattr **attrs)
66 {
67 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
68 struct xfrm_algo_auth *algp;
69
70 if (!rt)
71 return 0;
72
73 algp = nla_data(rt);
74 if (nla_len(rt) < xfrm_alg_auth_len(algp))
75 return -EINVAL;
76
77 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
78 return 0;
79 }
80
81 static int verify_aead(struct nlattr **attrs)
82 {
83 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
84 struct xfrm_algo_aead *algp;
85
86 if (!rt)
87 return 0;
88
89 algp = nla_data(rt);
90 if (nla_len(rt) < aead_len(algp))
91 return -EINVAL;
92
93 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
94 return 0;
95 }
96
97 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
98 xfrm_address_t **addrp)
99 {
100 struct nlattr *rt = attrs[type];
101
102 if (rt && addrp)
103 *addrp = nla_data(rt);
104 }
105
106 static inline int verify_sec_ctx_len(struct nlattr **attrs)
107 {
108 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
109 struct xfrm_user_sec_ctx *uctx;
110
111 if (!rt)
112 return 0;
113
114 uctx = nla_data(rt);
115 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
116 return -EINVAL;
117
118 return 0;
119 }
120
121
122 static int verify_newsa_info(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124 {
125 int err;
126
127 err = -EINVAL;
128 switch (p->family) {
129 case AF_INET:
130 break;
131
132 case AF_INET6:
133 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
134 break;
135 #else
136 err = -EAFNOSUPPORT;
137 goto out;
138 #endif
139
140 default:
141 goto out;
142 }
143
144 err = -EINVAL;
145 switch (p->id.proto) {
146 case IPPROTO_AH:
147 if ((!attrs[XFRMA_ALG_AUTH] &&
148 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
149 attrs[XFRMA_ALG_AEAD] ||
150 attrs[XFRMA_ALG_CRYPT] ||
151 attrs[XFRMA_ALG_COMP])
152 goto out;
153 break;
154
155 case IPPROTO_ESP:
156 if (attrs[XFRMA_ALG_COMP])
157 goto out;
158 if (!attrs[XFRMA_ALG_AUTH] &&
159 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
160 !attrs[XFRMA_ALG_CRYPT] &&
161 !attrs[XFRMA_ALG_AEAD])
162 goto out;
163 if ((attrs[XFRMA_ALG_AUTH] ||
164 attrs[XFRMA_ALG_AUTH_TRUNC] ||
165 attrs[XFRMA_ALG_CRYPT]) &&
166 attrs[XFRMA_ALG_AEAD])
167 goto out;
168 break;
169
170 case IPPROTO_COMP:
171 if (!attrs[XFRMA_ALG_COMP] ||
172 attrs[XFRMA_ALG_AEAD] ||
173 attrs[XFRMA_ALG_AUTH] ||
174 attrs[XFRMA_ALG_AUTH_TRUNC] ||
175 attrs[XFRMA_ALG_CRYPT])
176 goto out;
177 break;
178
179 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
180 case IPPROTO_DSTOPTS:
181 case IPPROTO_ROUTING:
182 if (attrs[XFRMA_ALG_COMP] ||
183 attrs[XFRMA_ALG_AUTH] ||
184 attrs[XFRMA_ALG_AUTH_TRUNC] ||
185 attrs[XFRMA_ALG_AEAD] ||
186 attrs[XFRMA_ALG_CRYPT] ||
187 attrs[XFRMA_ENCAP] ||
188 attrs[XFRMA_SEC_CTX] ||
189 !attrs[XFRMA_COADDR])
190 goto out;
191 break;
192 #endif
193
194 default:
195 goto out;
196 }
197
198 if ((err = verify_aead(attrs)))
199 goto out;
200 if ((err = verify_auth_trunc(attrs)))
201 goto out;
202 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
203 goto out;
204 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
205 goto out;
206 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
207 goto out;
208 if ((err = verify_sec_ctx_len(attrs)))
209 goto out;
210
211 err = -EINVAL;
212 switch (p->mode) {
213 case XFRM_MODE_TRANSPORT:
214 case XFRM_MODE_TUNNEL:
215 case XFRM_MODE_ROUTEOPTIMIZATION:
216 case XFRM_MODE_BEET:
217 break;
218
219 default:
220 goto out;
221 }
222
223 err = 0;
224
225 out:
226 return err;
227 }
228
229 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
230 struct xfrm_algo_desc *(*get_byname)(char *, int),
231 struct nlattr *rta)
232 {
233 struct xfrm_algo *p, *ualg;
234 struct xfrm_algo_desc *algo;
235
236 if (!rta)
237 return 0;
238
239 ualg = nla_data(rta);
240
241 algo = get_byname(ualg->alg_name, 1);
242 if (!algo)
243 return -ENOSYS;
244 *props = algo->desc.sadb_alg_id;
245
246 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
247 if (!p)
248 return -ENOMEM;
249
250 strcpy(p->alg_name, algo->name);
251 *algpp = p;
252 return 0;
253 }
254
255 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
256 struct nlattr *rta)
257 {
258 struct xfrm_algo *ualg;
259 struct xfrm_algo_auth *p;
260 struct xfrm_algo_desc *algo;
261
262 if (!rta)
263 return 0;
264
265 ualg = nla_data(rta);
266
267 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
268 if (!algo)
269 return -ENOSYS;
270 *props = algo->desc.sadb_alg_id;
271
272 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
273 if (!p)
274 return -ENOMEM;
275
276 strcpy(p->alg_name, algo->name);
277 p->alg_key_len = ualg->alg_key_len;
278 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
279 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
280
281 *algpp = p;
282 return 0;
283 }
284
285 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
286 struct nlattr *rta)
287 {
288 struct xfrm_algo_auth *p, *ualg;
289 struct xfrm_algo_desc *algo;
290
291 if (!rta)
292 return 0;
293
294 ualg = nla_data(rta);
295
296 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
297 if (!algo)
298 return -ENOSYS;
299 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
300 return -EINVAL;
301 *props = algo->desc.sadb_alg_id;
302
303 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
304 if (!p)
305 return -ENOMEM;
306
307 strcpy(p->alg_name, algo->name);
308 if (!p->alg_trunc_len)
309 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
310
311 *algpp = p;
312 return 0;
313 }
314
315 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
316 struct nlattr *rta)
317 {
318 struct xfrm_algo_aead *p, *ualg;
319 struct xfrm_algo_desc *algo;
320
321 if (!rta)
322 return 0;
323
324 ualg = nla_data(rta);
325
326 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
327 if (!algo)
328 return -ENOSYS;
329 *props = algo->desc.sadb_alg_id;
330
331 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
332 if (!p)
333 return -ENOMEM;
334
335 strcpy(p->alg_name, algo->name);
336 *algpp = p;
337 return 0;
338 }
339
340 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
341 {
342 int len = 0;
343
344 if (xfrm_ctx) {
345 len += sizeof(struct xfrm_user_sec_ctx);
346 len += xfrm_ctx->ctx_len;
347 }
348 return len;
349 }
350
351 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
352 {
353 memcpy(&x->id, &p->id, sizeof(x->id));
354 memcpy(&x->sel, &p->sel, sizeof(x->sel));
355 memcpy(&x->lft, &p->lft, sizeof(x->lft));
356 x->props.mode = p->mode;
357 x->props.replay_window = p->replay_window;
358 x->props.reqid = p->reqid;
359 x->props.family = p->family;
360 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
361 x->props.flags = p->flags;
362
363 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
364 x->sel.family = p->family;
365 }
366
367 /*
368 * someday when pfkey also has support, we could have the code
369 * somehow made shareable and move it to xfrm_state.c - JHS
370 *
371 */
372 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
373 {
374 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
375 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
376 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
377 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
378
379 if (rp) {
380 struct xfrm_replay_state *replay;
381 replay = nla_data(rp);
382 memcpy(&x->replay, replay, sizeof(*replay));
383 memcpy(&x->preplay, replay, sizeof(*replay));
384 }
385
386 if (lt) {
387 struct xfrm_lifetime_cur *ltime;
388 ltime = nla_data(lt);
389 x->curlft.bytes = ltime->bytes;
390 x->curlft.packets = ltime->packets;
391 x->curlft.add_time = ltime->add_time;
392 x->curlft.use_time = ltime->use_time;
393 }
394
395 if (et)
396 x->replay_maxage = nla_get_u32(et);
397
398 if (rt)
399 x->replay_maxdiff = nla_get_u32(rt);
400 }
401
402 static struct xfrm_state *xfrm_state_construct(struct net *net,
403 struct xfrm_usersa_info *p,
404 struct nlattr **attrs,
405 int *errp)
406 {
407 struct xfrm_state *x = xfrm_state_alloc(net);
408 int err = -ENOMEM;
409
410 if (!x)
411 goto error_no_put;
412
413 copy_from_user_state(x, p);
414
415 if ((err = attach_aead(&x->aead, &x->props.ealgo,
416 attrs[XFRMA_ALG_AEAD])))
417 goto error;
418 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
419 attrs[XFRMA_ALG_AUTH_TRUNC])))
420 goto error;
421 if (!x->props.aalgo) {
422 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
423 attrs[XFRMA_ALG_AUTH])))
424 goto error;
425 }
426 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
427 xfrm_ealg_get_byname,
428 attrs[XFRMA_ALG_CRYPT])))
429 goto error;
430 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
431 xfrm_calg_get_byname,
432 attrs[XFRMA_ALG_COMP])))
433 goto error;
434
435 if (attrs[XFRMA_ENCAP]) {
436 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
437 sizeof(*x->encap), GFP_KERNEL);
438 if (x->encap == NULL)
439 goto error;
440 }
441
442 if (attrs[XFRMA_COADDR]) {
443 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
444 sizeof(*x->coaddr), GFP_KERNEL);
445 if (x->coaddr == NULL)
446 goto error;
447 }
448
449 xfrm_mark_get(attrs, &x->mark);
450
451 err = xfrm_init_state(x);
452 if (err)
453 goto error;
454
455 if (attrs[XFRMA_SEC_CTX] &&
456 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
457 goto error;
458
459 x->km.seq = p->seq;
460 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
461 /* sysctl_xfrm_aevent_etime is in 100ms units */
462 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
463 x->preplay.bitmap = 0;
464 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
465 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
466
467 /* override default values from above */
468
469 xfrm_update_ae_params(x, attrs);
470
471 return x;
472
473 error:
474 x->km.state = XFRM_STATE_DEAD;
475 xfrm_state_put(x);
476 error_no_put:
477 *errp = err;
478 return NULL;
479 }
480
481 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
482 struct nlattr **attrs)
483 {
484 struct net *net = sock_net(skb->sk);
485 struct xfrm_usersa_info *p = nlmsg_data(nlh);
486 struct xfrm_state *x;
487 int err;
488 struct km_event c;
489 uid_t loginuid = NETLINK_CB(skb).loginuid;
490 u32 sessionid = NETLINK_CB(skb).sessionid;
491 u32 sid = NETLINK_CB(skb).sid;
492
493 err = verify_newsa_info(p, attrs);
494 if (err)
495 return err;
496
497 x = xfrm_state_construct(net, p, attrs, &err);
498 if (!x)
499 return err;
500
501 xfrm_state_hold(x);
502 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
503 err = xfrm_state_add(x);
504 else
505 err = xfrm_state_update(x);
506
507 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
508
509 if (err < 0) {
510 x->km.state = XFRM_STATE_DEAD;
511 __xfrm_state_put(x);
512 goto out;
513 }
514
515 c.seq = nlh->nlmsg_seq;
516 c.pid = nlh->nlmsg_pid;
517 c.event = nlh->nlmsg_type;
518
519 km_state_notify(x, &c);
520 out:
521 xfrm_state_put(x);
522 return err;
523 }
524
525 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
526 struct xfrm_usersa_id *p,
527 struct nlattr **attrs,
528 int *errp)
529 {
530 struct xfrm_state *x = NULL;
531 struct xfrm_mark m;
532 int err;
533 u32 mark = xfrm_mark_get(attrs, &m);
534
535 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
536 err = -ESRCH;
537 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
538 } else {
539 xfrm_address_t *saddr = NULL;
540
541 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
542 if (!saddr) {
543 err = -EINVAL;
544 goto out;
545 }
546
547 err = -ESRCH;
548 x = xfrm_state_lookup_byaddr(net, mark,
549 &p->daddr, saddr,
550 p->proto, p->family);
551 }
552
553 out:
554 if (!x && errp)
555 *errp = err;
556 return x;
557 }
558
559 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
560 struct nlattr **attrs)
561 {
562 struct net *net = sock_net(skb->sk);
563 struct xfrm_state *x;
564 int err = -ESRCH;
565 struct km_event c;
566 struct xfrm_usersa_id *p = nlmsg_data(nlh);
567 uid_t loginuid = NETLINK_CB(skb).loginuid;
568 u32 sessionid = NETLINK_CB(skb).sessionid;
569 u32 sid = NETLINK_CB(skb).sid;
570
571 x = xfrm_user_state_lookup(net, p, attrs, &err);
572 if (x == NULL)
573 return err;
574
575 if ((err = security_xfrm_state_delete(x)) != 0)
576 goto out;
577
578 if (xfrm_state_kern(x)) {
579 err = -EPERM;
580 goto out;
581 }
582
583 err = xfrm_state_delete(x);
584
585 if (err < 0)
586 goto out;
587
588 c.seq = nlh->nlmsg_seq;
589 c.pid = nlh->nlmsg_pid;
590 c.event = nlh->nlmsg_type;
591 km_state_notify(x, &c);
592
593 out:
594 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
595 xfrm_state_put(x);
596 return err;
597 }
598
599 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
600 {
601 memcpy(&p->id, &x->id, sizeof(p->id));
602 memcpy(&p->sel, &x->sel, sizeof(p->sel));
603 memcpy(&p->lft, &x->lft, sizeof(p->lft));
604 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
605 memcpy(&p->stats, &x->stats, sizeof(p->stats));
606 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
607 p->mode = x->props.mode;
608 p->replay_window = x->props.replay_window;
609 p->reqid = x->props.reqid;
610 p->family = x->props.family;
611 p->flags = x->props.flags;
612 p->seq = x->km.seq;
613 }
614
615 struct xfrm_dump_info {
616 struct sk_buff *in_skb;
617 struct sk_buff *out_skb;
618 u32 nlmsg_seq;
619 u16 nlmsg_flags;
620 };
621
622 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
623 {
624 struct xfrm_user_sec_ctx *uctx;
625 struct nlattr *attr;
626 int ctx_size = sizeof(*uctx) + s->ctx_len;
627
628 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
629 if (attr == NULL)
630 return -EMSGSIZE;
631
632 uctx = nla_data(attr);
633 uctx->exttype = XFRMA_SEC_CTX;
634 uctx->len = ctx_size;
635 uctx->ctx_doi = s->ctx_doi;
636 uctx->ctx_alg = s->ctx_alg;
637 uctx->ctx_len = s->ctx_len;
638 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
639
640 return 0;
641 }
642
643 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
644 {
645 struct xfrm_algo *algo;
646 struct nlattr *nla;
647
648 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
649 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
650 if (!nla)
651 return -EMSGSIZE;
652
653 algo = nla_data(nla);
654 strcpy(algo->alg_name, auth->alg_name);
655 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
656 algo->alg_key_len = auth->alg_key_len;
657
658 return 0;
659 }
660
661 /* Don't change this without updating xfrm_sa_len! */
662 static int copy_to_user_state_extra(struct xfrm_state *x,
663 struct xfrm_usersa_info *p,
664 struct sk_buff *skb)
665 {
666 copy_to_user_state(x, p);
667
668 if (x->coaddr)
669 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
670
671 if (x->lastused)
672 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
673
674 if (x->aead)
675 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
676 if (x->aalg) {
677 if (copy_to_user_auth(x->aalg, skb))
678 goto nla_put_failure;
679
680 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC,
681 xfrm_alg_auth_len(x->aalg), x->aalg);
682 }
683 if (x->ealg)
684 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
685 if (x->calg)
686 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
687
688 if (x->encap)
689 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
690
691 if (xfrm_mark_put(skb, &x->mark))
692 goto nla_put_failure;
693
694 if (x->security && copy_sec_ctx(x->security, skb) < 0)
695 goto nla_put_failure;
696
697 return 0;
698
699 nla_put_failure:
700 return -EMSGSIZE;
701 }
702
703 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
704 {
705 struct xfrm_dump_info *sp = ptr;
706 struct sk_buff *in_skb = sp->in_skb;
707 struct sk_buff *skb = sp->out_skb;
708 struct xfrm_usersa_info *p;
709 struct nlmsghdr *nlh;
710 int err;
711
712 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
713 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
714 if (nlh == NULL)
715 return -EMSGSIZE;
716
717 p = nlmsg_data(nlh);
718
719 err = copy_to_user_state_extra(x, p, skb);
720 if (err)
721 goto nla_put_failure;
722
723 nlmsg_end(skb, nlh);
724 return 0;
725
726 nla_put_failure:
727 nlmsg_cancel(skb, nlh);
728 return err;
729 }
730
731 static int xfrm_dump_sa_done(struct netlink_callback *cb)
732 {
733 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
734 xfrm_state_walk_done(walk);
735 return 0;
736 }
737
738 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
739 {
740 struct net *net = sock_net(skb->sk);
741 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
742 struct xfrm_dump_info info;
743
744 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
745 sizeof(cb->args) - sizeof(cb->args[0]));
746
747 info.in_skb = cb->skb;
748 info.out_skb = skb;
749 info.nlmsg_seq = cb->nlh->nlmsg_seq;
750 info.nlmsg_flags = NLM_F_MULTI;
751
752 if (!cb->args[0]) {
753 cb->args[0] = 1;
754 xfrm_state_walk_init(walk, 0);
755 }
756
757 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
758
759 return skb->len;
760 }
761
762 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
763 struct xfrm_state *x, u32 seq)
764 {
765 struct xfrm_dump_info info;
766 struct sk_buff *skb;
767
768 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
769 if (!skb)
770 return ERR_PTR(-ENOMEM);
771
772 info.in_skb = in_skb;
773 info.out_skb = skb;
774 info.nlmsg_seq = seq;
775 info.nlmsg_flags = 0;
776
777 if (dump_one_state(x, 0, &info)) {
778 kfree_skb(skb);
779 return NULL;
780 }
781
782 return skb;
783 }
784
785 static inline size_t xfrm_spdinfo_msgsize(void)
786 {
787 return NLMSG_ALIGN(4)
788 + nla_total_size(sizeof(struct xfrmu_spdinfo))
789 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
790 }
791
792 static int build_spdinfo(struct sk_buff *skb, struct net *net,
793 u32 pid, u32 seq, u32 flags)
794 {
795 struct xfrmk_spdinfo si;
796 struct xfrmu_spdinfo spc;
797 struct xfrmu_spdhinfo sph;
798 struct nlmsghdr *nlh;
799 u32 *f;
800
801 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
802 if (nlh == NULL) /* shouldnt really happen ... */
803 return -EMSGSIZE;
804
805 f = nlmsg_data(nlh);
806 *f = flags;
807 xfrm_spd_getinfo(net, &si);
808 spc.incnt = si.incnt;
809 spc.outcnt = si.outcnt;
810 spc.fwdcnt = si.fwdcnt;
811 spc.inscnt = si.inscnt;
812 spc.outscnt = si.outscnt;
813 spc.fwdscnt = si.fwdscnt;
814 sph.spdhcnt = si.spdhcnt;
815 sph.spdhmcnt = si.spdhmcnt;
816
817 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
818 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
819
820 return nlmsg_end(skb, nlh);
821
822 nla_put_failure:
823 nlmsg_cancel(skb, nlh);
824 return -EMSGSIZE;
825 }
826
827 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
828 struct nlattr **attrs)
829 {
830 struct net *net = sock_net(skb->sk);
831 struct sk_buff *r_skb;
832 u32 *flags = nlmsg_data(nlh);
833 u32 spid = NETLINK_CB(skb).pid;
834 u32 seq = nlh->nlmsg_seq;
835
836 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
837 if (r_skb == NULL)
838 return -ENOMEM;
839
840 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
841 BUG();
842
843 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
844 }
845
846 static inline size_t xfrm_sadinfo_msgsize(void)
847 {
848 return NLMSG_ALIGN(4)
849 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
850 + nla_total_size(4); /* XFRMA_SAD_CNT */
851 }
852
853 static int build_sadinfo(struct sk_buff *skb, struct net *net,
854 u32 pid, u32 seq, u32 flags)
855 {
856 struct xfrmk_sadinfo si;
857 struct xfrmu_sadhinfo sh;
858 struct nlmsghdr *nlh;
859 u32 *f;
860
861 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
862 if (nlh == NULL) /* shouldnt really happen ... */
863 return -EMSGSIZE;
864
865 f = nlmsg_data(nlh);
866 *f = flags;
867 xfrm_sad_getinfo(net, &si);
868
869 sh.sadhmcnt = si.sadhmcnt;
870 sh.sadhcnt = si.sadhcnt;
871
872 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
873 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
874
875 return nlmsg_end(skb, nlh);
876
877 nla_put_failure:
878 nlmsg_cancel(skb, nlh);
879 return -EMSGSIZE;
880 }
881
882 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
883 struct nlattr **attrs)
884 {
885 struct net *net = sock_net(skb->sk);
886 struct sk_buff *r_skb;
887 u32 *flags = nlmsg_data(nlh);
888 u32 spid = NETLINK_CB(skb).pid;
889 u32 seq = nlh->nlmsg_seq;
890
891 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
892 if (r_skb == NULL)
893 return -ENOMEM;
894
895 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
896 BUG();
897
898 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
899 }
900
901 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
902 struct nlattr **attrs)
903 {
904 struct net *net = sock_net(skb->sk);
905 struct xfrm_usersa_id *p = nlmsg_data(nlh);
906 struct xfrm_state *x;
907 struct sk_buff *resp_skb;
908 int err = -ESRCH;
909
910 x = xfrm_user_state_lookup(net, p, attrs, &err);
911 if (x == NULL)
912 goto out_noput;
913
914 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
915 if (IS_ERR(resp_skb)) {
916 err = PTR_ERR(resp_skb);
917 } else {
918 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
919 }
920 xfrm_state_put(x);
921 out_noput:
922 return err;
923 }
924
925 static int verify_userspi_info(struct xfrm_userspi_info *p)
926 {
927 switch (p->info.id.proto) {
928 case IPPROTO_AH:
929 case IPPROTO_ESP:
930 break;
931
932 case IPPROTO_COMP:
933 /* IPCOMP spi is 16-bits. */
934 if (p->max >= 0x10000)
935 return -EINVAL;
936 break;
937
938 default:
939 return -EINVAL;
940 }
941
942 if (p->min > p->max)
943 return -EINVAL;
944
945 return 0;
946 }
947
948 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
949 struct nlattr **attrs)
950 {
951 struct net *net = sock_net(skb->sk);
952 struct xfrm_state *x;
953 struct xfrm_userspi_info *p;
954 struct sk_buff *resp_skb;
955 xfrm_address_t *daddr;
956 int family;
957 int err;
958 u32 mark;
959 struct xfrm_mark m;
960
961 p = nlmsg_data(nlh);
962 err = verify_userspi_info(p);
963 if (err)
964 goto out_noput;
965
966 family = p->info.family;
967 daddr = &p->info.id.daddr;
968
969 x = NULL;
970
971 mark = xfrm_mark_get(attrs, &m);
972 if (p->info.seq) {
973 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
974 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
975 xfrm_state_put(x);
976 x = NULL;
977 }
978 }
979
980 if (!x)
981 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
982 p->info.id.proto, daddr,
983 &p->info.saddr, 1,
984 family);
985 err = -ENOENT;
986 if (x == NULL)
987 goto out_noput;
988
989 err = xfrm_alloc_spi(x, p->min, p->max);
990 if (err)
991 goto out;
992
993 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
994 if (IS_ERR(resp_skb)) {
995 err = PTR_ERR(resp_skb);
996 goto out;
997 }
998
999 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1000
1001 out:
1002 xfrm_state_put(x);
1003 out_noput:
1004 return err;
1005 }
1006
1007 static int verify_policy_dir(u8 dir)
1008 {
1009 switch (dir) {
1010 case XFRM_POLICY_IN:
1011 case XFRM_POLICY_OUT:
1012 case XFRM_POLICY_FWD:
1013 break;
1014
1015 default:
1016 return -EINVAL;
1017 }
1018
1019 return 0;
1020 }
1021
1022 static int verify_policy_type(u8 type)
1023 {
1024 switch (type) {
1025 case XFRM_POLICY_TYPE_MAIN:
1026 #ifdef CONFIG_XFRM_SUB_POLICY
1027 case XFRM_POLICY_TYPE_SUB:
1028 #endif
1029 break;
1030
1031 default:
1032 return -EINVAL;
1033 }
1034
1035 return 0;
1036 }
1037
1038 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1039 {
1040 switch (p->share) {
1041 case XFRM_SHARE_ANY:
1042 case XFRM_SHARE_SESSION:
1043 case XFRM_SHARE_USER:
1044 case XFRM_SHARE_UNIQUE:
1045 break;
1046
1047 default:
1048 return -EINVAL;
1049 }
1050
1051 switch (p->action) {
1052 case XFRM_POLICY_ALLOW:
1053 case XFRM_POLICY_BLOCK:
1054 break;
1055
1056 default:
1057 return -EINVAL;
1058 }
1059
1060 switch (p->sel.family) {
1061 case AF_INET:
1062 break;
1063
1064 case AF_INET6:
1065 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1066 break;
1067 #else
1068 return -EAFNOSUPPORT;
1069 #endif
1070
1071 default:
1072 return -EINVAL;
1073 }
1074
1075 return verify_policy_dir(p->dir);
1076 }
1077
1078 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1079 {
1080 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1081 struct xfrm_user_sec_ctx *uctx;
1082
1083 if (!rt)
1084 return 0;
1085
1086 uctx = nla_data(rt);
1087 return security_xfrm_policy_alloc(&pol->security, uctx);
1088 }
1089
1090 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1091 int nr)
1092 {
1093 int i;
1094
1095 xp->xfrm_nr = nr;
1096 for (i = 0; i < nr; i++, ut++) {
1097 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1098
1099 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1100 memcpy(&t->saddr, &ut->saddr,
1101 sizeof(xfrm_address_t));
1102 t->reqid = ut->reqid;
1103 t->mode = ut->mode;
1104 t->share = ut->share;
1105 t->optional = ut->optional;
1106 t->aalgos = ut->aalgos;
1107 t->ealgos = ut->ealgos;
1108 t->calgos = ut->calgos;
1109 /* If all masks are ~0, then we allow all algorithms. */
1110 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1111 t->encap_family = ut->family;
1112 }
1113 }
1114
1115 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1116 {
1117 int i;
1118
1119 if (nr > XFRM_MAX_DEPTH)
1120 return -EINVAL;
1121
1122 for (i = 0; i < nr; i++) {
1123 /* We never validated the ut->family value, so many
1124 * applications simply leave it at zero. The check was
1125 * never made and ut->family was ignored because all
1126 * templates could be assumed to have the same family as
1127 * the policy itself. Now that we will have ipv4-in-ipv6
1128 * and ipv6-in-ipv4 tunnels, this is no longer true.
1129 */
1130 if (!ut[i].family)
1131 ut[i].family = family;
1132
1133 switch (ut[i].family) {
1134 case AF_INET:
1135 break;
1136 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1137 case AF_INET6:
1138 break;
1139 #endif
1140 default:
1141 return -EINVAL;
1142 }
1143 }
1144
1145 return 0;
1146 }
1147
1148 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1149 {
1150 struct nlattr *rt = attrs[XFRMA_TMPL];
1151
1152 if (!rt) {
1153 pol->xfrm_nr = 0;
1154 } else {
1155 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1156 int nr = nla_len(rt) / sizeof(*utmpl);
1157 int err;
1158
1159 err = validate_tmpl(nr, utmpl, pol->family);
1160 if (err)
1161 return err;
1162
1163 copy_templates(pol, utmpl, nr);
1164 }
1165 return 0;
1166 }
1167
1168 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1169 {
1170 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1171 struct xfrm_userpolicy_type *upt;
1172 u8 type = XFRM_POLICY_TYPE_MAIN;
1173 int err;
1174
1175 if (rt) {
1176 upt = nla_data(rt);
1177 type = upt->type;
1178 }
1179
1180 err = verify_policy_type(type);
1181 if (err)
1182 return err;
1183
1184 *tp = type;
1185 return 0;
1186 }
1187
1188 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1189 {
1190 xp->priority = p->priority;
1191 xp->index = p->index;
1192 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1193 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1194 xp->action = p->action;
1195 xp->flags = p->flags;
1196 xp->family = p->sel.family;
1197 /* XXX xp->share = p->share; */
1198 }
1199
1200 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1201 {
1202 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1203 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1204 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1205 p->priority = xp->priority;
1206 p->index = xp->index;
1207 p->sel.family = xp->family;
1208 p->dir = dir;
1209 p->action = xp->action;
1210 p->flags = xp->flags;
1211 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1212 }
1213
1214 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1215 {
1216 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1217 int err;
1218
1219 if (!xp) {
1220 *errp = -ENOMEM;
1221 return NULL;
1222 }
1223
1224 copy_from_user_policy(xp, p);
1225
1226 err = copy_from_user_policy_type(&xp->type, attrs);
1227 if (err)
1228 goto error;
1229
1230 if (!(err = copy_from_user_tmpl(xp, attrs)))
1231 err = copy_from_user_sec_ctx(xp, attrs);
1232 if (err)
1233 goto error;
1234
1235 xfrm_mark_get(attrs, &xp->mark);
1236
1237 return xp;
1238 error:
1239 *errp = err;
1240 xp->walk.dead = 1;
1241 xfrm_policy_destroy(xp);
1242 return NULL;
1243 }
1244
1245 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1246 struct nlattr **attrs)
1247 {
1248 struct net *net = sock_net(skb->sk);
1249 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1250 struct xfrm_policy *xp;
1251 struct km_event c;
1252 int err;
1253 int excl;
1254 uid_t loginuid = NETLINK_CB(skb).loginuid;
1255 u32 sessionid = NETLINK_CB(skb).sessionid;
1256 u32 sid = NETLINK_CB(skb).sid;
1257
1258 err = verify_newpolicy_info(p);
1259 if (err)
1260 return err;
1261 err = verify_sec_ctx_len(attrs);
1262 if (err)
1263 return err;
1264
1265 xp = xfrm_policy_construct(net, p, attrs, &err);
1266 if (!xp)
1267 return err;
1268
1269 /* shouldnt excl be based on nlh flags??
1270 * Aha! this is anti-netlink really i.e more pfkey derived
1271 * in netlink excl is a flag and you wouldnt need
1272 * a type XFRM_MSG_UPDPOLICY - JHS */
1273 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1274 err = xfrm_policy_insert(p->dir, xp, excl);
1275 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1276
1277 if (err) {
1278 security_xfrm_policy_free(xp->security);
1279 kfree(xp);
1280 return err;
1281 }
1282
1283 c.event = nlh->nlmsg_type;
1284 c.seq = nlh->nlmsg_seq;
1285 c.pid = nlh->nlmsg_pid;
1286 km_policy_notify(xp, p->dir, &c);
1287
1288 xfrm_pol_put(xp);
1289
1290 return 0;
1291 }
1292
1293 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1294 {
1295 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1296 int i;
1297
1298 if (xp->xfrm_nr == 0)
1299 return 0;
1300
1301 for (i = 0; i < xp->xfrm_nr; i++) {
1302 struct xfrm_user_tmpl *up = &vec[i];
1303 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1304
1305 memcpy(&up->id, &kp->id, sizeof(up->id));
1306 up->family = kp->encap_family;
1307 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1308 up->reqid = kp->reqid;
1309 up->mode = kp->mode;
1310 up->share = kp->share;
1311 up->optional = kp->optional;
1312 up->aalgos = kp->aalgos;
1313 up->ealgos = kp->ealgos;
1314 up->calgos = kp->calgos;
1315 }
1316
1317 return nla_put(skb, XFRMA_TMPL,
1318 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1319 }
1320
1321 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1322 {
1323 if (x->security) {
1324 return copy_sec_ctx(x->security, skb);
1325 }
1326 return 0;
1327 }
1328
1329 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1330 {
1331 if (xp->security) {
1332 return copy_sec_ctx(xp->security, skb);
1333 }
1334 return 0;
1335 }
1336 static inline size_t userpolicy_type_attrsize(void)
1337 {
1338 #ifdef CONFIG_XFRM_SUB_POLICY
1339 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1340 #else
1341 return 0;
1342 #endif
1343 }
1344
1345 #ifdef CONFIG_XFRM_SUB_POLICY
1346 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1347 {
1348 struct xfrm_userpolicy_type upt = {
1349 .type = type,
1350 };
1351
1352 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1353 }
1354
1355 #else
1356 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1357 {
1358 return 0;
1359 }
1360 #endif
1361
1362 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1363 {
1364 struct xfrm_dump_info *sp = ptr;
1365 struct xfrm_userpolicy_info *p;
1366 struct sk_buff *in_skb = sp->in_skb;
1367 struct sk_buff *skb = sp->out_skb;
1368 struct nlmsghdr *nlh;
1369
1370 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1371 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1372 if (nlh == NULL)
1373 return -EMSGSIZE;
1374
1375 p = nlmsg_data(nlh);
1376 copy_to_user_policy(xp, p, dir);
1377 if (copy_to_user_tmpl(xp, skb) < 0)
1378 goto nlmsg_failure;
1379 if (copy_to_user_sec_ctx(xp, skb))
1380 goto nlmsg_failure;
1381 if (copy_to_user_policy_type(xp->type, skb) < 0)
1382 goto nlmsg_failure;
1383 if (xfrm_mark_put(skb, &xp->mark))
1384 goto nla_put_failure;
1385
1386 nlmsg_end(skb, nlh);
1387 return 0;
1388
1389 nla_put_failure:
1390 nlmsg_failure:
1391 nlmsg_cancel(skb, nlh);
1392 return -EMSGSIZE;
1393 }
1394
1395 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1396 {
1397 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1398
1399 xfrm_policy_walk_done(walk);
1400 return 0;
1401 }
1402
1403 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1404 {
1405 struct net *net = sock_net(skb->sk);
1406 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1407 struct xfrm_dump_info info;
1408
1409 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1410 sizeof(cb->args) - sizeof(cb->args[0]));
1411
1412 info.in_skb = cb->skb;
1413 info.out_skb = skb;
1414 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1415 info.nlmsg_flags = NLM_F_MULTI;
1416
1417 if (!cb->args[0]) {
1418 cb->args[0] = 1;
1419 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1420 }
1421
1422 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1423
1424 return skb->len;
1425 }
1426
1427 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1428 struct xfrm_policy *xp,
1429 int dir, u32 seq)
1430 {
1431 struct xfrm_dump_info info;
1432 struct sk_buff *skb;
1433
1434 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1435 if (!skb)
1436 return ERR_PTR(-ENOMEM);
1437
1438 info.in_skb = in_skb;
1439 info.out_skb = skb;
1440 info.nlmsg_seq = seq;
1441 info.nlmsg_flags = 0;
1442
1443 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1444 kfree_skb(skb);
1445 return NULL;
1446 }
1447
1448 return skb;
1449 }
1450
1451 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1452 struct nlattr **attrs)
1453 {
1454 struct net *net = sock_net(skb->sk);
1455 struct xfrm_policy *xp;
1456 struct xfrm_userpolicy_id *p;
1457 u8 type = XFRM_POLICY_TYPE_MAIN;
1458 int err;
1459 struct km_event c;
1460 int delete;
1461 struct xfrm_mark m;
1462 u32 mark = xfrm_mark_get(attrs, &m);
1463
1464 p = nlmsg_data(nlh);
1465 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1466
1467 err = copy_from_user_policy_type(&type, attrs);
1468 if (err)
1469 return err;
1470
1471 err = verify_policy_dir(p->dir);
1472 if (err)
1473 return err;
1474
1475 if (p->index)
1476 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1477 else {
1478 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1479 struct xfrm_sec_ctx *ctx;
1480
1481 err = verify_sec_ctx_len(attrs);
1482 if (err)
1483 return err;
1484
1485 ctx = NULL;
1486 if (rt) {
1487 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1488
1489 err = security_xfrm_policy_alloc(&ctx, uctx);
1490 if (err)
1491 return err;
1492 }
1493 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1494 ctx, delete, &err);
1495 security_xfrm_policy_free(ctx);
1496 }
1497 if (xp == NULL)
1498 return -ENOENT;
1499
1500 if (!delete) {
1501 struct sk_buff *resp_skb;
1502
1503 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1504 if (IS_ERR(resp_skb)) {
1505 err = PTR_ERR(resp_skb);
1506 } else {
1507 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1508 NETLINK_CB(skb).pid);
1509 }
1510 } else {
1511 uid_t loginuid = NETLINK_CB(skb).loginuid;
1512 u32 sessionid = NETLINK_CB(skb).sessionid;
1513 u32 sid = NETLINK_CB(skb).sid;
1514
1515 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1516 sid);
1517
1518 if (err != 0)
1519 goto out;
1520
1521 c.data.byid = p->index;
1522 c.event = nlh->nlmsg_type;
1523 c.seq = nlh->nlmsg_seq;
1524 c.pid = nlh->nlmsg_pid;
1525 km_policy_notify(xp, p->dir, &c);
1526 }
1527
1528 out:
1529 xfrm_pol_put(xp);
1530 return err;
1531 }
1532
1533 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1534 struct nlattr **attrs)
1535 {
1536 struct net *net = sock_net(skb->sk);
1537 struct km_event c;
1538 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1539 struct xfrm_audit audit_info;
1540 int err;
1541
1542 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1543 audit_info.sessionid = NETLINK_CB(skb).sessionid;
1544 audit_info.secid = NETLINK_CB(skb).sid;
1545 err = xfrm_state_flush(net, p->proto, &audit_info);
1546 if (err) {
1547 if (err == -ESRCH) /* empty table */
1548 return 0;
1549 return err;
1550 }
1551 c.data.proto = p->proto;
1552 c.event = nlh->nlmsg_type;
1553 c.seq = nlh->nlmsg_seq;
1554 c.pid = nlh->nlmsg_pid;
1555 c.net = net;
1556 km_state_notify(NULL, &c);
1557
1558 return 0;
1559 }
1560
1561 static inline size_t xfrm_aevent_msgsize(void)
1562 {
1563 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1564 + nla_total_size(sizeof(struct xfrm_replay_state))
1565 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1566 + nla_total_size(sizeof(struct xfrm_mark))
1567 + nla_total_size(4) /* XFRM_AE_RTHR */
1568 + nla_total_size(4); /* XFRM_AE_ETHR */
1569 }
1570
1571 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1572 {
1573 struct xfrm_aevent_id *id;
1574 struct nlmsghdr *nlh;
1575
1576 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1577 if (nlh == NULL)
1578 return -EMSGSIZE;
1579
1580 id = nlmsg_data(nlh);
1581 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1582 id->sa_id.spi = x->id.spi;
1583 id->sa_id.family = x->props.family;
1584 id->sa_id.proto = x->id.proto;
1585 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1586 id->reqid = x->props.reqid;
1587 id->flags = c->data.aevent;
1588
1589 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1590 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1591
1592 if (id->flags & XFRM_AE_RTHR)
1593 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1594
1595 if (id->flags & XFRM_AE_ETHR)
1596 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1597 x->replay_maxage * 10 / HZ);
1598
1599 if (xfrm_mark_put(skb, &x->mark))
1600 goto nla_put_failure;
1601
1602 return nlmsg_end(skb, nlh);
1603
1604 nla_put_failure:
1605 nlmsg_cancel(skb, nlh);
1606 return -EMSGSIZE;
1607 }
1608
1609 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1610 struct nlattr **attrs)
1611 {
1612 struct net *net = sock_net(skb->sk);
1613 struct xfrm_state *x;
1614 struct sk_buff *r_skb;
1615 int err;
1616 struct km_event c;
1617 u32 mark;
1618 struct xfrm_mark m;
1619 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1620 struct xfrm_usersa_id *id = &p->sa_id;
1621
1622 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1623 if (r_skb == NULL)
1624 return -ENOMEM;
1625
1626 mark = xfrm_mark_get(attrs, &m);
1627
1628 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1629 if (x == NULL) {
1630 kfree_skb(r_skb);
1631 return -ESRCH;
1632 }
1633
1634 /*
1635 * XXX: is this lock really needed - none of the other
1636 * gets lock (the concern is things getting updated
1637 * while we are still reading) - jhs
1638 */
1639 spin_lock_bh(&x->lock);
1640 c.data.aevent = p->flags;
1641 c.seq = nlh->nlmsg_seq;
1642 c.pid = nlh->nlmsg_pid;
1643
1644 if (build_aevent(r_skb, x, &c) < 0)
1645 BUG();
1646 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1647 spin_unlock_bh(&x->lock);
1648 xfrm_state_put(x);
1649 return err;
1650 }
1651
1652 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1653 struct nlattr **attrs)
1654 {
1655 struct net *net = sock_net(skb->sk);
1656 struct xfrm_state *x;
1657 struct km_event c;
1658 int err = - EINVAL;
1659 u32 mark = 0;
1660 struct xfrm_mark m;
1661 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1662 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1663 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1664
1665 if (!lt && !rp)
1666 return err;
1667
1668 /* pedantic mode - thou shalt sayeth replaceth */
1669 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1670 return err;
1671
1672 mark = xfrm_mark_get(attrs, &m);
1673
1674 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1675 if (x == NULL)
1676 return -ESRCH;
1677
1678 if (x->km.state != XFRM_STATE_VALID)
1679 goto out;
1680
1681 spin_lock_bh(&x->lock);
1682 xfrm_update_ae_params(x, attrs);
1683 spin_unlock_bh(&x->lock);
1684
1685 c.event = nlh->nlmsg_type;
1686 c.seq = nlh->nlmsg_seq;
1687 c.pid = nlh->nlmsg_pid;
1688 c.data.aevent = XFRM_AE_CU;
1689 km_state_notify(x, &c);
1690 err = 0;
1691 out:
1692 xfrm_state_put(x);
1693 return err;
1694 }
1695
1696 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1697 struct nlattr **attrs)
1698 {
1699 struct net *net = sock_net(skb->sk);
1700 struct km_event c;
1701 u8 type = XFRM_POLICY_TYPE_MAIN;
1702 int err;
1703 struct xfrm_audit audit_info;
1704
1705 err = copy_from_user_policy_type(&type, attrs);
1706 if (err)
1707 return err;
1708
1709 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1710 audit_info.sessionid = NETLINK_CB(skb).sessionid;
1711 audit_info.secid = NETLINK_CB(skb).sid;
1712 err = xfrm_policy_flush(net, type, &audit_info);
1713 if (err) {
1714 if (err == -ESRCH) /* empty table */
1715 return 0;
1716 return err;
1717 }
1718
1719 c.data.type = type;
1720 c.event = nlh->nlmsg_type;
1721 c.seq = nlh->nlmsg_seq;
1722 c.pid = nlh->nlmsg_pid;
1723 c.net = net;
1724 km_policy_notify(NULL, 0, &c);
1725 return 0;
1726 }
1727
1728 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1729 struct nlattr **attrs)
1730 {
1731 struct net *net = sock_net(skb->sk);
1732 struct xfrm_policy *xp;
1733 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1734 struct xfrm_userpolicy_info *p = &up->pol;
1735 u8 type = XFRM_POLICY_TYPE_MAIN;
1736 int err = -ENOENT;
1737 struct xfrm_mark m;
1738 u32 mark = xfrm_mark_get(attrs, &m);
1739
1740 err = copy_from_user_policy_type(&type, attrs);
1741 if (err)
1742 return err;
1743
1744 err = verify_policy_dir(p->dir);
1745 if (err)
1746 return err;
1747
1748 if (p->index)
1749 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1750 else {
1751 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1752 struct xfrm_sec_ctx *ctx;
1753
1754 err = verify_sec_ctx_len(attrs);
1755 if (err)
1756 return err;
1757
1758 ctx = NULL;
1759 if (rt) {
1760 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1761
1762 err = security_xfrm_policy_alloc(&ctx, uctx);
1763 if (err)
1764 return err;
1765 }
1766 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1767 &p->sel, ctx, 0, &err);
1768 security_xfrm_policy_free(ctx);
1769 }
1770 if (xp == NULL)
1771 return -ENOENT;
1772
1773 if (unlikely(xp->walk.dead))
1774 goto out;
1775
1776 err = 0;
1777 if (up->hard) {
1778 uid_t loginuid = NETLINK_CB(skb).loginuid;
1779 uid_t sessionid = NETLINK_CB(skb).sessionid;
1780 u32 sid = NETLINK_CB(skb).sid;
1781 xfrm_policy_delete(xp, p->dir);
1782 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1783
1784 } else {
1785 // reset the timers here?
1786 WARN(1, "Dont know what to do with soft policy expire\n");
1787 }
1788 km_policy_expired(xp, p->dir, up->hard, current->pid);
1789
1790 out:
1791 xfrm_pol_put(xp);
1792 return err;
1793 }
1794
1795 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1796 struct nlattr **attrs)
1797 {
1798 struct net *net = sock_net(skb->sk);
1799 struct xfrm_state *x;
1800 int err;
1801 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1802 struct xfrm_usersa_info *p = &ue->state;
1803 struct xfrm_mark m;
1804 u32 mark = xfrm_mark_get(attrs, &m);;
1805
1806 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1807
1808 err = -ENOENT;
1809 if (x == NULL)
1810 return err;
1811
1812 spin_lock_bh(&x->lock);
1813 err = -EINVAL;
1814 if (x->km.state != XFRM_STATE_VALID)
1815 goto out;
1816 km_state_expired(x, ue->hard, current->pid);
1817
1818 if (ue->hard) {
1819 uid_t loginuid = NETLINK_CB(skb).loginuid;
1820 uid_t sessionid = NETLINK_CB(skb).sessionid;
1821 u32 sid = NETLINK_CB(skb).sid;
1822 __xfrm_state_delete(x);
1823 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1824 }
1825 err = 0;
1826 out:
1827 spin_unlock_bh(&x->lock);
1828 xfrm_state_put(x);
1829 return err;
1830 }
1831
1832 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1833 struct nlattr **attrs)
1834 {
1835 struct net *net = sock_net(skb->sk);
1836 struct xfrm_policy *xp;
1837 struct xfrm_user_tmpl *ut;
1838 int i;
1839 struct nlattr *rt = attrs[XFRMA_TMPL];
1840 struct xfrm_mark mark;
1841
1842 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1843 struct xfrm_state *x = xfrm_state_alloc(net);
1844 int err = -ENOMEM;
1845
1846 if (!x)
1847 goto nomem;
1848
1849 xfrm_mark_get(attrs, &mark);
1850
1851 err = verify_newpolicy_info(&ua->policy);
1852 if (err)
1853 goto bad_policy;
1854
1855 /* build an XP */
1856 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
1857 if (!xp)
1858 goto free_state;
1859
1860 memcpy(&x->id, &ua->id, sizeof(ua->id));
1861 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1862 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1863 xp->mark.m = x->mark.m = mark.m;
1864 xp->mark.v = x->mark.v = mark.v;
1865 ut = nla_data(rt);
1866 /* extract the templates and for each call km_key */
1867 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1868 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1869 memcpy(&x->id, &t->id, sizeof(x->id));
1870 x->props.mode = t->mode;
1871 x->props.reqid = t->reqid;
1872 x->props.family = ut->family;
1873 t->aalgos = ua->aalgos;
1874 t->ealgos = ua->ealgos;
1875 t->calgos = ua->calgos;
1876 err = km_query(x, t, xp);
1877
1878 }
1879
1880 kfree(x);
1881 kfree(xp);
1882
1883 return 0;
1884
1885 bad_policy:
1886 WARN(1, "BAD policy passed\n");
1887 free_state:
1888 kfree(x);
1889 nomem:
1890 return err;
1891 }
1892
1893 #ifdef CONFIG_XFRM_MIGRATE
1894 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1895 struct xfrm_kmaddress *k,
1896 struct nlattr **attrs, int *num)
1897 {
1898 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1899 struct xfrm_user_migrate *um;
1900 int i, num_migrate;
1901
1902 if (k != NULL) {
1903 struct xfrm_user_kmaddress *uk;
1904
1905 uk = nla_data(attrs[XFRMA_KMADDRESS]);
1906 memcpy(&k->local, &uk->local, sizeof(k->local));
1907 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
1908 k->family = uk->family;
1909 k->reserved = uk->reserved;
1910 }
1911
1912 um = nla_data(rt);
1913 num_migrate = nla_len(rt) / sizeof(*um);
1914
1915 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1916 return -EINVAL;
1917
1918 for (i = 0; i < num_migrate; i++, um++, ma++) {
1919 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1920 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1921 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1922 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1923
1924 ma->proto = um->proto;
1925 ma->mode = um->mode;
1926 ma->reqid = um->reqid;
1927
1928 ma->old_family = um->old_family;
1929 ma->new_family = um->new_family;
1930 }
1931
1932 *num = i;
1933 return 0;
1934 }
1935
1936 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1937 struct nlattr **attrs)
1938 {
1939 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1940 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1941 struct xfrm_kmaddress km, *kmp;
1942 u8 type;
1943 int err;
1944 int n = 0;
1945
1946 if (attrs[XFRMA_MIGRATE] == NULL)
1947 return -EINVAL;
1948
1949 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
1950
1951 err = copy_from_user_policy_type(&type, attrs);
1952 if (err)
1953 return err;
1954
1955 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
1956 if (err)
1957 return err;
1958
1959 if (!n)
1960 return 0;
1961
1962 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
1963
1964 return 0;
1965 }
1966 #else
1967 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1968 struct nlattr **attrs)
1969 {
1970 return -ENOPROTOOPT;
1971 }
1972 #endif
1973
1974 #ifdef CONFIG_XFRM_MIGRATE
1975 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1976 {
1977 struct xfrm_user_migrate um;
1978
1979 memset(&um, 0, sizeof(um));
1980 um.proto = m->proto;
1981 um.mode = m->mode;
1982 um.reqid = m->reqid;
1983 um.old_family = m->old_family;
1984 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1985 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1986 um.new_family = m->new_family;
1987 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1988 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1989
1990 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1991 }
1992
1993 static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
1994 {
1995 struct xfrm_user_kmaddress uk;
1996
1997 memset(&uk, 0, sizeof(uk));
1998 uk.family = k->family;
1999 uk.reserved = k->reserved;
2000 memcpy(&uk.local, &k->local, sizeof(uk.local));
2001 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2002
2003 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2004 }
2005
2006 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2007 {
2008 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2009 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2010 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2011 + userpolicy_type_attrsize();
2012 }
2013
2014 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
2015 int num_migrate, struct xfrm_kmaddress *k,
2016 struct xfrm_selector *sel, u8 dir, u8 type)
2017 {
2018 struct xfrm_migrate *mp;
2019 struct xfrm_userpolicy_id *pol_id;
2020 struct nlmsghdr *nlh;
2021 int i;
2022
2023 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2024 if (nlh == NULL)
2025 return -EMSGSIZE;
2026
2027 pol_id = nlmsg_data(nlh);
2028 /* copy data from selector, dir, and type to the pol_id */
2029 memset(pol_id, 0, sizeof(*pol_id));
2030 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2031 pol_id->dir = dir;
2032
2033 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
2034 goto nlmsg_failure;
2035
2036 if (copy_to_user_policy_type(type, skb) < 0)
2037 goto nlmsg_failure;
2038
2039 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2040 if (copy_to_user_migrate(mp, skb) < 0)
2041 goto nlmsg_failure;
2042 }
2043
2044 return nlmsg_end(skb, nlh);
2045 nlmsg_failure:
2046 nlmsg_cancel(skb, nlh);
2047 return -EMSGSIZE;
2048 }
2049
2050 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2051 struct xfrm_migrate *m, int num_migrate,
2052 struct xfrm_kmaddress *k)
2053 {
2054 struct net *net = &init_net;
2055 struct sk_buff *skb;
2056
2057 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2058 if (skb == NULL)
2059 return -ENOMEM;
2060
2061 /* build migrate */
2062 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2063 BUG();
2064
2065 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2066 }
2067 #else
2068 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2069 struct xfrm_migrate *m, int num_migrate,
2070 struct xfrm_kmaddress *k)
2071 {
2072 return -ENOPROTOOPT;
2073 }
2074 #endif
2075
2076 #define XMSGSIZE(type) sizeof(struct type)
2077
2078 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2079 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2080 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2081 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2082 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2083 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2084 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2085 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2086 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2087 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2088 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2089 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2090 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2091 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2092 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2093 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2094 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2095 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2096 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2097 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2098 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2099 };
2100
2101 #undef XMSGSIZE
2102
2103 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2104 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2105 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2106 [XFRMA_LASTUSED] = { .type = NLA_U64},
2107 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2108 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2109 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2110 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2111 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2112 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2113 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2114 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2115 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2116 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2117 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2118 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2119 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2120 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2121 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2122 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2123 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2124 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2125 };
2126
2127 static struct xfrm_link {
2128 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2129 int (*dump)(struct sk_buff *, struct netlink_callback *);
2130 int (*done)(struct netlink_callback *);
2131 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2132 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2133 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2134 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2135 .dump = xfrm_dump_sa,
2136 .done = xfrm_dump_sa_done },
2137 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2138 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2139 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2140 .dump = xfrm_dump_policy,
2141 .done = xfrm_dump_policy_done },
2142 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2143 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2144 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2145 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2146 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2147 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2148 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2149 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2150 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2151 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2152 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2153 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2154 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2155 };
2156
2157 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2158 {
2159 struct net *net = sock_net(skb->sk);
2160 struct nlattr *attrs[XFRMA_MAX+1];
2161 struct xfrm_link *link;
2162 int type, err;
2163
2164 type = nlh->nlmsg_type;
2165 if (type > XFRM_MSG_MAX)
2166 return -EINVAL;
2167
2168 type -= XFRM_MSG_BASE;
2169 link = &xfrm_dispatch[type];
2170
2171 /* All operations require privileges, even GET */
2172 if (security_netlink_recv(skb, CAP_NET_ADMIN))
2173 return -EPERM;
2174
2175 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2176 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2177 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2178 if (link->dump == NULL)
2179 return -EINVAL;
2180
2181 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done);
2182 }
2183
2184 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2185 xfrma_policy);
2186 if (err < 0)
2187 return err;
2188
2189 if (link->doit == NULL)
2190 return -EINVAL;
2191
2192 return link->doit(skb, nlh, attrs);
2193 }
2194
2195 static void xfrm_netlink_rcv(struct sk_buff *skb)
2196 {
2197 mutex_lock(&xfrm_cfg_mutex);
2198 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2199 mutex_unlock(&xfrm_cfg_mutex);
2200 }
2201
2202 static inline size_t xfrm_expire_msgsize(void)
2203 {
2204 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2205 + nla_total_size(sizeof(struct xfrm_mark));
2206 }
2207
2208 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
2209 {
2210 struct xfrm_user_expire *ue;
2211 struct nlmsghdr *nlh;
2212
2213 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2214 if (nlh == NULL)
2215 return -EMSGSIZE;
2216
2217 ue = nlmsg_data(nlh);
2218 copy_to_user_state(x, &ue->state);
2219 ue->hard = (c->data.hard != 0) ? 1 : 0;
2220
2221 if (xfrm_mark_put(skb, &x->mark))
2222 goto nla_put_failure;
2223
2224 return nlmsg_end(skb, nlh);
2225
2226 nla_put_failure:
2227 return -EMSGSIZE;
2228 }
2229
2230 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
2231 {
2232 struct net *net = xs_net(x);
2233 struct sk_buff *skb;
2234
2235 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2236 if (skb == NULL)
2237 return -ENOMEM;
2238
2239 if (build_expire(skb, x, c) < 0) {
2240 kfree_skb(skb);
2241 return -EMSGSIZE;
2242 }
2243
2244 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2245 }
2246
2247 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2248 {
2249 struct net *net = xs_net(x);
2250 struct sk_buff *skb;
2251
2252 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2253 if (skb == NULL)
2254 return -ENOMEM;
2255
2256 if (build_aevent(skb, x, c) < 0)
2257 BUG();
2258
2259 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2260 }
2261
2262 static int xfrm_notify_sa_flush(struct km_event *c)
2263 {
2264 struct net *net = c->net;
2265 struct xfrm_usersa_flush *p;
2266 struct nlmsghdr *nlh;
2267 struct sk_buff *skb;
2268 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2269
2270 skb = nlmsg_new(len, GFP_ATOMIC);
2271 if (skb == NULL)
2272 return -ENOMEM;
2273
2274 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2275 if (nlh == NULL) {
2276 kfree_skb(skb);
2277 return -EMSGSIZE;
2278 }
2279
2280 p = nlmsg_data(nlh);
2281 p->proto = c->data.proto;
2282
2283 nlmsg_end(skb, nlh);
2284
2285 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2286 }
2287
2288 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2289 {
2290 size_t l = 0;
2291 if (x->aead)
2292 l += nla_total_size(aead_len(x->aead));
2293 if (x->aalg) {
2294 l += nla_total_size(sizeof(struct xfrm_algo) +
2295 (x->aalg->alg_key_len + 7) / 8);
2296 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2297 }
2298 if (x->ealg)
2299 l += nla_total_size(xfrm_alg_len(x->ealg));
2300 if (x->calg)
2301 l += nla_total_size(sizeof(*x->calg));
2302 if (x->encap)
2303 l += nla_total_size(sizeof(*x->encap));
2304 if (x->security)
2305 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2306 x->security->ctx_len);
2307 if (x->coaddr)
2308 l += nla_total_size(sizeof(*x->coaddr));
2309
2310 /* Must count x->lastused as it may become non-zero behind our back. */
2311 l += nla_total_size(sizeof(u64));
2312
2313 return l;
2314 }
2315
2316 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2317 {
2318 struct net *net = xs_net(x);
2319 struct xfrm_usersa_info *p;
2320 struct xfrm_usersa_id *id;
2321 struct nlmsghdr *nlh;
2322 struct sk_buff *skb;
2323 int len = xfrm_sa_len(x);
2324 int headlen;
2325
2326 headlen = sizeof(*p);
2327 if (c->event == XFRM_MSG_DELSA) {
2328 len += nla_total_size(headlen);
2329 headlen = sizeof(*id);
2330 len += nla_total_size(sizeof(struct xfrm_mark));
2331 }
2332 len += NLMSG_ALIGN(headlen);
2333
2334 skb = nlmsg_new(len, GFP_ATOMIC);
2335 if (skb == NULL)
2336 return -ENOMEM;
2337
2338 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2339 if (nlh == NULL)
2340 goto nla_put_failure;
2341
2342 p = nlmsg_data(nlh);
2343 if (c->event == XFRM_MSG_DELSA) {
2344 struct nlattr *attr;
2345
2346 id = nlmsg_data(nlh);
2347 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2348 id->spi = x->id.spi;
2349 id->family = x->props.family;
2350 id->proto = x->id.proto;
2351
2352 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2353 if (attr == NULL)
2354 goto nla_put_failure;
2355
2356 p = nla_data(attr);
2357 }
2358
2359 if (copy_to_user_state_extra(x, p, skb))
2360 goto nla_put_failure;
2361
2362 nlmsg_end(skb, nlh);
2363
2364 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2365
2366 nla_put_failure:
2367 /* Somebody screwed up with xfrm_sa_len! */
2368 WARN_ON(1);
2369 kfree_skb(skb);
2370 return -1;
2371 }
2372
2373 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2374 {
2375
2376 switch (c->event) {
2377 case XFRM_MSG_EXPIRE:
2378 return xfrm_exp_state_notify(x, c);
2379 case XFRM_MSG_NEWAE:
2380 return xfrm_aevent_state_notify(x, c);
2381 case XFRM_MSG_DELSA:
2382 case XFRM_MSG_UPDSA:
2383 case XFRM_MSG_NEWSA:
2384 return xfrm_notify_sa(x, c);
2385 case XFRM_MSG_FLUSHSA:
2386 return xfrm_notify_sa_flush(c);
2387 default:
2388 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2389 c->event);
2390 break;
2391 }
2392
2393 return 0;
2394
2395 }
2396
2397 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2398 struct xfrm_policy *xp)
2399 {
2400 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2401 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2402 + nla_total_size(sizeof(struct xfrm_mark))
2403 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2404 + userpolicy_type_attrsize();
2405 }
2406
2407 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2408 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2409 int dir)
2410 {
2411 struct xfrm_user_acquire *ua;
2412 struct nlmsghdr *nlh;
2413 __u32 seq = xfrm_get_acqseq();
2414
2415 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2416 if (nlh == NULL)
2417 return -EMSGSIZE;
2418
2419 ua = nlmsg_data(nlh);
2420 memcpy(&ua->id, &x->id, sizeof(ua->id));
2421 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2422 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2423 copy_to_user_policy(xp, &ua->policy, dir);
2424 ua->aalgos = xt->aalgos;
2425 ua->ealgos = xt->ealgos;
2426 ua->calgos = xt->calgos;
2427 ua->seq = x->km.seq = seq;
2428
2429 if (copy_to_user_tmpl(xp, skb) < 0)
2430 goto nlmsg_failure;
2431 if (copy_to_user_state_sec_ctx(x, skb))
2432 goto nlmsg_failure;
2433 if (copy_to_user_policy_type(xp->type, skb) < 0)
2434 goto nlmsg_failure;
2435 if (xfrm_mark_put(skb, &xp->mark))
2436 goto nla_put_failure;
2437
2438 return nlmsg_end(skb, nlh);
2439
2440 nla_put_failure:
2441 nlmsg_failure:
2442 nlmsg_cancel(skb, nlh);
2443 return -EMSGSIZE;
2444 }
2445
2446 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2447 struct xfrm_policy *xp, int dir)
2448 {
2449 struct net *net = xs_net(x);
2450 struct sk_buff *skb;
2451
2452 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2453 if (skb == NULL)
2454 return -ENOMEM;
2455
2456 if (build_acquire(skb, x, xt, xp, dir) < 0)
2457 BUG();
2458
2459 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2460 }
2461
2462 /* User gives us xfrm_user_policy_info followed by an array of 0
2463 * or more templates.
2464 */
2465 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2466 u8 *data, int len, int *dir)
2467 {
2468 struct net *net = sock_net(sk);
2469 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2470 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2471 struct xfrm_policy *xp;
2472 int nr;
2473
2474 switch (sk->sk_family) {
2475 case AF_INET:
2476 if (opt != IP_XFRM_POLICY) {
2477 *dir = -EOPNOTSUPP;
2478 return NULL;
2479 }
2480 break;
2481 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2482 case AF_INET6:
2483 if (opt != IPV6_XFRM_POLICY) {
2484 *dir = -EOPNOTSUPP;
2485 return NULL;
2486 }
2487 break;
2488 #endif
2489 default:
2490 *dir = -EINVAL;
2491 return NULL;
2492 }
2493
2494 *dir = -EINVAL;
2495
2496 if (len < sizeof(*p) ||
2497 verify_newpolicy_info(p))
2498 return NULL;
2499
2500 nr = ((len - sizeof(*p)) / sizeof(*ut));
2501 if (validate_tmpl(nr, ut, p->sel.family))
2502 return NULL;
2503
2504 if (p->dir > XFRM_POLICY_OUT)
2505 return NULL;
2506
2507 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2508 if (xp == NULL) {
2509 *dir = -ENOBUFS;
2510 return NULL;
2511 }
2512
2513 copy_from_user_policy(xp, p);
2514 xp->type = XFRM_POLICY_TYPE_MAIN;
2515 copy_templates(xp, ut, nr);
2516
2517 *dir = p->dir;
2518
2519 return xp;
2520 }
2521
2522 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2523 {
2524 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2525 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2526 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2527 + nla_total_size(sizeof(struct xfrm_mark))
2528 + userpolicy_type_attrsize();
2529 }
2530
2531 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2532 int dir, struct km_event *c)
2533 {
2534 struct xfrm_user_polexpire *upe;
2535 struct nlmsghdr *nlh;
2536 int hard = c->data.hard;
2537
2538 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2539 if (nlh == NULL)
2540 return -EMSGSIZE;
2541
2542 upe = nlmsg_data(nlh);
2543 copy_to_user_policy(xp, &upe->pol, dir);
2544 if (copy_to_user_tmpl(xp, skb) < 0)
2545 goto nlmsg_failure;
2546 if (copy_to_user_sec_ctx(xp, skb))
2547 goto nlmsg_failure;
2548 if (copy_to_user_policy_type(xp->type, skb) < 0)
2549 goto nlmsg_failure;
2550 if (xfrm_mark_put(skb, &xp->mark))
2551 goto nla_put_failure;
2552 upe->hard = !!hard;
2553
2554 return nlmsg_end(skb, nlh);
2555
2556 nla_put_failure:
2557 nlmsg_failure:
2558 nlmsg_cancel(skb, nlh);
2559 return -EMSGSIZE;
2560 }
2561
2562 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2563 {
2564 struct net *net = xp_net(xp);
2565 struct sk_buff *skb;
2566
2567 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2568 if (skb == NULL)
2569 return -ENOMEM;
2570
2571 if (build_polexpire(skb, xp, dir, c) < 0)
2572 BUG();
2573
2574 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2575 }
2576
2577 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2578 {
2579 struct net *net = xp_net(xp);
2580 struct xfrm_userpolicy_info *p;
2581 struct xfrm_userpolicy_id *id;
2582 struct nlmsghdr *nlh;
2583 struct sk_buff *skb;
2584 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2585 int headlen;
2586
2587 headlen = sizeof(*p);
2588 if (c->event == XFRM_MSG_DELPOLICY) {
2589 len += nla_total_size(headlen);
2590 headlen = sizeof(*id);
2591 }
2592 len += userpolicy_type_attrsize();
2593 len += nla_total_size(sizeof(struct xfrm_mark));
2594 len += NLMSG_ALIGN(headlen);
2595
2596 skb = nlmsg_new(len, GFP_ATOMIC);
2597 if (skb == NULL)
2598 return -ENOMEM;
2599
2600 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2601 if (nlh == NULL)
2602 goto nlmsg_failure;
2603
2604 p = nlmsg_data(nlh);
2605 if (c->event == XFRM_MSG_DELPOLICY) {
2606 struct nlattr *attr;
2607
2608 id = nlmsg_data(nlh);
2609 memset(id, 0, sizeof(*id));
2610 id->dir = dir;
2611 if (c->data.byid)
2612 id->index = xp->index;
2613 else
2614 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2615
2616 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2617 if (attr == NULL)
2618 goto nlmsg_failure;
2619
2620 p = nla_data(attr);
2621 }
2622
2623 copy_to_user_policy(xp, p, dir);
2624 if (copy_to_user_tmpl(xp, skb) < 0)
2625 goto nlmsg_failure;
2626 if (copy_to_user_policy_type(xp->type, skb) < 0)
2627 goto nlmsg_failure;
2628
2629 if (xfrm_mark_put(skb, &xp->mark))
2630 goto nla_put_failure;
2631
2632 nlmsg_end(skb, nlh);
2633
2634 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2635
2636 nla_put_failure:
2637 nlmsg_failure:
2638 kfree_skb(skb);
2639 return -1;
2640 }
2641
2642 static int xfrm_notify_policy_flush(struct km_event *c)
2643 {
2644 struct net *net = c->net;
2645 struct nlmsghdr *nlh;
2646 struct sk_buff *skb;
2647
2648 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2649 if (skb == NULL)
2650 return -ENOMEM;
2651
2652 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2653 if (nlh == NULL)
2654 goto nlmsg_failure;
2655 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2656 goto nlmsg_failure;
2657
2658 nlmsg_end(skb, nlh);
2659
2660 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2661
2662 nlmsg_failure:
2663 kfree_skb(skb);
2664 return -1;
2665 }
2666
2667 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2668 {
2669
2670 switch (c->event) {
2671 case XFRM_MSG_NEWPOLICY:
2672 case XFRM_MSG_UPDPOLICY:
2673 case XFRM_MSG_DELPOLICY:
2674 return xfrm_notify_policy(xp, dir, c);
2675 case XFRM_MSG_FLUSHPOLICY:
2676 return xfrm_notify_policy_flush(c);
2677 case XFRM_MSG_POLEXPIRE:
2678 return xfrm_exp_policy_notify(xp, dir, c);
2679 default:
2680 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2681 c->event);
2682 }
2683
2684 return 0;
2685
2686 }
2687
2688 static inline size_t xfrm_report_msgsize(void)
2689 {
2690 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2691 }
2692
2693 static int build_report(struct sk_buff *skb, u8 proto,
2694 struct xfrm_selector *sel, xfrm_address_t *addr)
2695 {
2696 struct xfrm_user_report *ur;
2697 struct nlmsghdr *nlh;
2698
2699 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2700 if (nlh == NULL)
2701 return -EMSGSIZE;
2702
2703 ur = nlmsg_data(nlh);
2704 ur->proto = proto;
2705 memcpy(&ur->sel, sel, sizeof(ur->sel));
2706
2707 if (addr)
2708 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2709
2710 return nlmsg_end(skb, nlh);
2711
2712 nla_put_failure:
2713 nlmsg_cancel(skb, nlh);
2714 return -EMSGSIZE;
2715 }
2716
2717 static int xfrm_send_report(struct net *net, u8 proto,
2718 struct xfrm_selector *sel, xfrm_address_t *addr)
2719 {
2720 struct sk_buff *skb;
2721
2722 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2723 if (skb == NULL)
2724 return -ENOMEM;
2725
2726 if (build_report(skb, proto, sel, addr) < 0)
2727 BUG();
2728
2729 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2730 }
2731
2732 static inline size_t xfrm_mapping_msgsize(void)
2733 {
2734 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2735 }
2736
2737 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2738 xfrm_address_t *new_saddr, __be16 new_sport)
2739 {
2740 struct xfrm_user_mapping *um;
2741 struct nlmsghdr *nlh;
2742
2743 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2744 if (nlh == NULL)
2745 return -EMSGSIZE;
2746
2747 um = nlmsg_data(nlh);
2748
2749 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2750 um->id.spi = x->id.spi;
2751 um->id.family = x->props.family;
2752 um->id.proto = x->id.proto;
2753 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2754 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2755 um->new_sport = new_sport;
2756 um->old_sport = x->encap->encap_sport;
2757 um->reqid = x->props.reqid;
2758
2759 return nlmsg_end(skb, nlh);
2760 }
2761
2762 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2763 __be16 sport)
2764 {
2765 struct net *net = xs_net(x);
2766 struct sk_buff *skb;
2767
2768 if (x->id.proto != IPPROTO_ESP)
2769 return -EINVAL;
2770
2771 if (!x->encap)
2772 return -EINVAL;
2773
2774 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2775 if (skb == NULL)
2776 return -ENOMEM;
2777
2778 if (build_mapping(skb, x, ipaddr, sport) < 0)
2779 BUG();
2780
2781 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2782 }
2783
2784 static struct xfrm_mgr netlink_mgr = {
2785 .id = "netlink",
2786 .notify = xfrm_send_state_notify,
2787 .acquire = xfrm_send_acquire,
2788 .compile_policy = xfrm_compile_policy,
2789 .notify_policy = xfrm_send_policy_notify,
2790 .report = xfrm_send_report,
2791 .migrate = xfrm_send_migrate,
2792 .new_mapping = xfrm_send_mapping,
2793 };
2794
2795 static int __net_init xfrm_user_net_init(struct net *net)
2796 {
2797 struct sock *nlsk;
2798
2799 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
2800 xfrm_netlink_rcv, NULL, THIS_MODULE);
2801 if (nlsk == NULL)
2802 return -ENOMEM;
2803 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2804 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2805 return 0;
2806 }
2807
2808 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2809 {
2810 struct net *net;
2811 list_for_each_entry(net, net_exit_list, exit_list)
2812 rcu_assign_pointer(net->xfrm.nlsk, NULL);
2813 synchronize_net();
2814 list_for_each_entry(net, net_exit_list, exit_list)
2815 netlink_kernel_release(net->xfrm.nlsk_stash);
2816 }
2817
2818 static struct pernet_operations xfrm_user_net_ops = {
2819 .init = xfrm_user_net_init,
2820 .exit_batch = xfrm_user_net_exit,
2821 };
2822
2823 static int __init xfrm_user_init(void)
2824 {
2825 int rv;
2826
2827 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2828
2829 rv = register_pernet_subsys(&xfrm_user_net_ops);
2830 if (rv < 0)
2831 return rv;
2832 rv = xfrm_register_km(&netlink_mgr);
2833 if (rv < 0)
2834 unregister_pernet_subsys(&xfrm_user_net_ops);
2835 return rv;
2836 }
2837
2838 static void __exit xfrm_user_exit(void)
2839 {
2840 xfrm_unregister_km(&netlink_mgr);
2841 unregister_pernet_subsys(&xfrm_user_net_ops);
2842 }
2843
2844 module_init(xfrm_user_init);
2845 module_exit(xfrm_user_exit);
2846 MODULE_LICENSE("GPL");
2847 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2848
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