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xen mmu: fix a race window causing leave_mm BUG()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / xfrm / xfrm_user.c
blob61291965c5f60a0354ee499f664df340845bc9e7
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 <net/ah.h>
30 #include <asm/uaccess.h>
31 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
32 #include <linux/in6.h>
33 #endif
34
35 static inline int aead_len(struct xfrm_algo_aead *alg)
36 {
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38 }
39
40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
41 {
42 struct nlattr *rt = attrs[type];
43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
48 algp = nla_data(rt);
49 if (nla_len(rt) < xfrm_alg_len(algp))
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 case XFRMA_ALG_CRYPT:
55 case XFRMA_ALG_COMP:
56 break;
57
58 default:
59 return -EINVAL;
60 }
61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64 }
65
66 static int verify_auth_trunc(struct nlattr **attrs)
67 {
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80 }
81
82 static int verify_aead(struct nlattr **attrs)
83 {
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96 }
97
98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
99 xfrm_address_t **addrp)
100 {
101 struct nlattr *rt = attrs[type];
102
103 if (rt && addrp)
104 *addrp = nla_data(rt);
105 }
106
107 static inline int verify_sec_ctx_len(struct nlattr **attrs)
108 {
109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
110 struct xfrm_user_sec_ctx *uctx;
111
112 if (!rt)
113 return 0;
114
115 uctx = nla_data(rt);
116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
117 return -EINVAL;
118
119 return 0;
120 }
121
122
123 static int verify_newsa_info(struct xfrm_usersa_info *p,
124 struct nlattr **attrs)
125 {
126 int err;
127
128 err = -EINVAL;
129 switch (p->family) {
130 case AF_INET:
131 break;
132
133 case AF_INET6:
134 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
135 break;
136 #else
137 err = -EAFNOSUPPORT;
138 goto out;
139 #endif
140
141 default:
142 goto out;
143 }
144
145 err = -EINVAL;
146 switch (p->id.proto) {
147 case IPPROTO_AH:
148 if ((!attrs[XFRMA_ALG_AUTH] &&
149 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
150 attrs[XFRMA_ALG_AEAD] ||
151 attrs[XFRMA_ALG_CRYPT] ||
152 attrs[XFRMA_ALG_COMP] ||
153 attrs[XFRMA_TFCPAD])
154 goto out;
155 break;
156
157 case IPPROTO_ESP:
158 if (attrs[XFRMA_ALG_COMP])
159 goto out;
160 if (!attrs[XFRMA_ALG_AUTH] &&
161 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
162 !attrs[XFRMA_ALG_CRYPT] &&
163 !attrs[XFRMA_ALG_AEAD])
164 goto out;
165 if ((attrs[XFRMA_ALG_AUTH] ||
166 attrs[XFRMA_ALG_AUTH_TRUNC] ||
167 attrs[XFRMA_ALG_CRYPT]) &&
168 attrs[XFRMA_ALG_AEAD])
169 goto out;
170 if (attrs[XFRMA_TFCPAD] &&
171 p->mode != XFRM_MODE_TUNNEL)
172 goto out;
173 break;
174
175 case IPPROTO_COMP:
176 if (!attrs[XFRMA_ALG_COMP] ||
177 attrs[XFRMA_ALG_AEAD] ||
178 attrs[XFRMA_ALG_AUTH] ||
179 attrs[XFRMA_ALG_AUTH_TRUNC] ||
180 attrs[XFRMA_ALG_CRYPT] ||
181 attrs[XFRMA_TFCPAD])
182 goto out;
183 break;
184
185 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
186 case IPPROTO_DSTOPTS:
187 case IPPROTO_ROUTING:
188 if (attrs[XFRMA_ALG_COMP] ||
189 attrs[XFRMA_ALG_AUTH] ||
190 attrs[XFRMA_ALG_AUTH_TRUNC] ||
191 attrs[XFRMA_ALG_AEAD] ||
192 attrs[XFRMA_ALG_CRYPT] ||
193 attrs[XFRMA_ENCAP] ||
194 attrs[XFRMA_SEC_CTX] ||
195 attrs[XFRMA_TFCPAD] ||
196 !attrs[XFRMA_COADDR])
197 goto out;
198 break;
199 #endif
200
201 default:
202 goto out;
203 }
204
205 if ((err = verify_aead(attrs)))
206 goto out;
207 if ((err = verify_auth_trunc(attrs)))
208 goto out;
209 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
210 goto out;
211 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
212 goto out;
213 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
214 goto out;
215 if ((err = verify_sec_ctx_len(attrs)))
216 goto out;
217
218 err = -EINVAL;
219 switch (p->mode) {
220 case XFRM_MODE_TRANSPORT:
221 case XFRM_MODE_TUNNEL:
222 case XFRM_MODE_ROUTEOPTIMIZATION:
223 case XFRM_MODE_BEET:
224 break;
225
226 default:
227 goto out;
228 }
229
230 err = 0;
231
232 out:
233 return err;
234 }
235
236 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
237 struct xfrm_algo_desc *(*get_byname)(char *, int),
238 struct nlattr *rta)
239 {
240 struct xfrm_algo *p, *ualg;
241 struct xfrm_algo_desc *algo;
242
243 if (!rta)
244 return 0;
245
246 ualg = nla_data(rta);
247
248 algo = get_byname(ualg->alg_name, 1);
249 if (!algo)
250 return -ENOSYS;
251 *props = algo->desc.sadb_alg_id;
252
253 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
254 if (!p)
255 return -ENOMEM;
256
257 strcpy(p->alg_name, algo->name);
258 *algpp = p;
259 return 0;
260 }
261
262 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
263 struct nlattr *rta)
264 {
265 struct xfrm_algo *ualg;
266 struct xfrm_algo_auth *p;
267 struct xfrm_algo_desc *algo;
268
269 if (!rta)
270 return 0;
271
272 ualg = nla_data(rta);
273
274 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
275 if (!algo)
276 return -ENOSYS;
277 *props = algo->desc.sadb_alg_id;
278
279 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
280 if (!p)
281 return -ENOMEM;
282
283 strcpy(p->alg_name, algo->name);
284 p->alg_key_len = ualg->alg_key_len;
285 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
286 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
287
288 *algpp = p;
289 return 0;
290 }
291
292 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
293 struct nlattr *rta)
294 {
295 struct xfrm_algo_auth *p, *ualg;
296 struct xfrm_algo_desc *algo;
297
298 if (!rta)
299 return 0;
300
301 ualg = nla_data(rta);
302
303 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
304 if (!algo)
305 return -ENOSYS;
306 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
307 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
308 return -EINVAL;
309 *props = algo->desc.sadb_alg_id;
310
311 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
312 if (!p)
313 return -ENOMEM;
314
315 strcpy(p->alg_name, algo->name);
316 if (!p->alg_trunc_len)
317 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
318
319 *algpp = p;
320 return 0;
321 }
322
323 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
324 struct nlattr *rta)
325 {
326 struct xfrm_algo_aead *p, *ualg;
327 struct xfrm_algo_desc *algo;
328
329 if (!rta)
330 return 0;
331
332 ualg = nla_data(rta);
333
334 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
335 if (!algo)
336 return -ENOSYS;
337 *props = algo->desc.sadb_alg_id;
338
339 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
340 if (!p)
341 return -ENOMEM;
342
343 strcpy(p->alg_name, algo->name);
344 *algpp = p;
345 return 0;
346 }
347
348 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
349 {
350 int len = 0;
351
352 if (xfrm_ctx) {
353 len += sizeof(struct xfrm_user_sec_ctx);
354 len += xfrm_ctx->ctx_len;
355 }
356 return len;
357 }
358
359 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
360 {
361 memcpy(&x->id, &p->id, sizeof(x->id));
362 memcpy(&x->sel, &p->sel, sizeof(x->sel));
363 memcpy(&x->lft, &p->lft, sizeof(x->lft));
364 x->props.mode = p->mode;
365 x->props.replay_window = p->replay_window;
366 x->props.reqid = p->reqid;
367 x->props.family = p->family;
368 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
369 x->props.flags = p->flags;
370
371 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
372 x->sel.family = p->family;
373 }
374
375 /*
376 * someday when pfkey also has support, we could have the code
377 * somehow made shareable and move it to xfrm_state.c - JHS
378 *
379 */
380 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
381 {
382 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
383 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
384 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
385 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
386
387 if (rp) {
388 struct xfrm_replay_state *replay;
389 replay = nla_data(rp);
390 memcpy(&x->replay, replay, sizeof(*replay));
391 memcpy(&x->preplay, replay, sizeof(*replay));
392 }
393
394 if (lt) {
395 struct xfrm_lifetime_cur *ltime;
396 ltime = nla_data(lt);
397 x->curlft.bytes = ltime->bytes;
398 x->curlft.packets = ltime->packets;
399 x->curlft.add_time = ltime->add_time;
400 x->curlft.use_time = ltime->use_time;
401 }
402
403 if (et)
404 x->replay_maxage = nla_get_u32(et);
405
406 if (rt)
407 x->replay_maxdiff = nla_get_u32(rt);
408 }
409
410 static struct xfrm_state *xfrm_state_construct(struct net *net,
411 struct xfrm_usersa_info *p,
412 struct nlattr **attrs,
413 int *errp)
414 {
415 struct xfrm_state *x = xfrm_state_alloc(net);
416 int err = -ENOMEM;
417
418 if (!x)
419 goto error_no_put;
420
421 copy_from_user_state(x, p);
422
423 if ((err = attach_aead(&x->aead, &x->props.ealgo,
424 attrs[XFRMA_ALG_AEAD])))
425 goto error;
426 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
427 attrs[XFRMA_ALG_AUTH_TRUNC])))
428 goto error;
429 if (!x->props.aalgo) {
430 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
431 attrs[XFRMA_ALG_AUTH])))
432 goto error;
433 }
434 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
435 xfrm_ealg_get_byname,
436 attrs[XFRMA_ALG_CRYPT])))
437 goto error;
438 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
439 xfrm_calg_get_byname,
440 attrs[XFRMA_ALG_COMP])))
441 goto error;
442
443 if (attrs[XFRMA_ENCAP]) {
444 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
445 sizeof(*x->encap), GFP_KERNEL);
446 if (x->encap == NULL)
447 goto error;
448 }
449
450 if (attrs[XFRMA_TFCPAD])
451 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
452
453 if (attrs[XFRMA_COADDR]) {
454 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
455 sizeof(*x->coaddr), GFP_KERNEL);
456 if (x->coaddr == NULL)
457 goto error;
458 }
459
460 xfrm_mark_get(attrs, &x->mark);
461
462 err = xfrm_init_state(x);
463 if (err)
464 goto error;
465
466 if (attrs[XFRMA_SEC_CTX] &&
467 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
468 goto error;
469
470 x->km.seq = p->seq;
471 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
472 /* sysctl_xfrm_aevent_etime is in 100ms units */
473 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
474 x->preplay.bitmap = 0;
475 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
476 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
477
478 /* override default values from above */
479
480 xfrm_update_ae_params(x, attrs);
481
482 return x;
483
484 error:
485 x->km.state = XFRM_STATE_DEAD;
486 xfrm_state_put(x);
487 error_no_put:
488 *errp = err;
489 return NULL;
490 }
491
492 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
493 struct nlattr **attrs)
494 {
495 struct net *net = sock_net(skb->sk);
496 struct xfrm_usersa_info *p = nlmsg_data(nlh);
497 struct xfrm_state *x;
498 int err;
499 struct km_event c;
500 uid_t loginuid = NETLINK_CB(skb).loginuid;
501 u32 sessionid = NETLINK_CB(skb).sessionid;
502 u32 sid = NETLINK_CB(skb).sid;
503
504 err = verify_newsa_info(p, attrs);
505 if (err)
506 return err;
507
508 x = xfrm_state_construct(net, p, attrs, &err);
509 if (!x)
510 return err;
511
512 xfrm_state_hold(x);
513 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
514 err = xfrm_state_add(x);
515 else
516 err = xfrm_state_update(x);
517
518 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
519
520 if (err < 0) {
521 x->km.state = XFRM_STATE_DEAD;
522 __xfrm_state_put(x);
523 goto out;
524 }
525
526 c.seq = nlh->nlmsg_seq;
527 c.pid = nlh->nlmsg_pid;
528 c.event = nlh->nlmsg_type;
529
530 km_state_notify(x, &c);
531 out:
532 xfrm_state_put(x);
533 return err;
534 }
535
536 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
537 struct xfrm_usersa_id *p,
538 struct nlattr **attrs,
539 int *errp)
540 {
541 struct xfrm_state *x = NULL;
542 struct xfrm_mark m;
543 int err;
544 u32 mark = xfrm_mark_get(attrs, &m);
545
546 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
547 err = -ESRCH;
548 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
549 } else {
550 xfrm_address_t *saddr = NULL;
551
552 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
553 if (!saddr) {
554 err = -EINVAL;
555 goto out;
556 }
557
558 err = -ESRCH;
559 x = xfrm_state_lookup_byaddr(net, mark,
560 &p->daddr, saddr,
561 p->proto, p->family);
562 }
563
564 out:
565 if (!x && errp)
566 *errp = err;
567 return x;
568 }
569
570 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
571 struct nlattr **attrs)
572 {
573 struct net *net = sock_net(skb->sk);
574 struct xfrm_state *x;
575 int err = -ESRCH;
576 struct km_event c;
577 struct xfrm_usersa_id *p = nlmsg_data(nlh);
578 uid_t loginuid = NETLINK_CB(skb).loginuid;
579 u32 sessionid = NETLINK_CB(skb).sessionid;
580 u32 sid = NETLINK_CB(skb).sid;
581
582 x = xfrm_user_state_lookup(net, p, attrs, &err);
583 if (x == NULL)
584 return err;
585
586 if ((err = security_xfrm_state_delete(x)) != 0)
587 goto out;
588
589 if (xfrm_state_kern(x)) {
590 err = -EPERM;
591 goto out;
592 }
593
594 err = xfrm_state_delete(x);
595
596 if (err < 0)
597 goto out;
598
599 c.seq = nlh->nlmsg_seq;
600 c.pid = nlh->nlmsg_pid;
601 c.event = nlh->nlmsg_type;
602 km_state_notify(x, &c);
603
604 out:
605 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
606 xfrm_state_put(x);
607 return err;
608 }
609
610 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
611 {
612 memcpy(&p->id, &x->id, sizeof(p->id));
613 memcpy(&p->sel, &x->sel, sizeof(p->sel));
614 memcpy(&p->lft, &x->lft, sizeof(p->lft));
615 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
616 memcpy(&p->stats, &x->stats, sizeof(p->stats));
617 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
618 p->mode = x->props.mode;
619 p->replay_window = x->props.replay_window;
620 p->reqid = x->props.reqid;
621 p->family = x->props.family;
622 p->flags = x->props.flags;
623 p->seq = x->km.seq;
624 }
625
626 struct xfrm_dump_info {
627 struct sk_buff *in_skb;
628 struct sk_buff *out_skb;
629 u32 nlmsg_seq;
630 u16 nlmsg_flags;
631 };
632
633 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
634 {
635 struct xfrm_user_sec_ctx *uctx;
636 struct nlattr *attr;
637 int ctx_size = sizeof(*uctx) + s->ctx_len;
638
639 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
640 if (attr == NULL)
641 return -EMSGSIZE;
642
643 uctx = nla_data(attr);
644 uctx->exttype = XFRMA_SEC_CTX;
645 uctx->len = ctx_size;
646 uctx->ctx_doi = s->ctx_doi;
647 uctx->ctx_alg = s->ctx_alg;
648 uctx->ctx_len = s->ctx_len;
649 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
650
651 return 0;
652 }
653
654 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
655 {
656 struct xfrm_algo *algo;
657 struct nlattr *nla;
658
659 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
660 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
661 if (!nla)
662 return -EMSGSIZE;
663
664 algo = nla_data(nla);
665 strcpy(algo->alg_name, auth->alg_name);
666 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
667 algo->alg_key_len = auth->alg_key_len;
668
669 return 0;
670 }
671
672 /* Don't change this without updating xfrm_sa_len! */
673 static int copy_to_user_state_extra(struct xfrm_state *x,
674 struct xfrm_usersa_info *p,
675 struct sk_buff *skb)
676 {
677 copy_to_user_state(x, p);
678
679 if (x->coaddr)
680 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
681
682 if (x->lastused)
683 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
684
685 if (x->aead)
686 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
687 if (x->aalg) {
688 if (copy_to_user_auth(x->aalg, skb))
689 goto nla_put_failure;
690
691 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC,
692 xfrm_alg_auth_len(x->aalg), x->aalg);
693 }
694 if (x->ealg)
695 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
696 if (x->calg)
697 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
698
699 if (x->encap)
700 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
701
702 if (x->tfcpad)
703 NLA_PUT_U32(skb, XFRMA_TFCPAD, x->tfcpad);
704
705 if (xfrm_mark_put(skb, &x->mark))
706 goto nla_put_failure;
707
708 if (x->security && copy_sec_ctx(x->security, skb) < 0)
709 goto nla_put_failure;
710
711 return 0;
712
713 nla_put_failure:
714 return -EMSGSIZE;
715 }
716
717 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
718 {
719 struct xfrm_dump_info *sp = ptr;
720 struct sk_buff *in_skb = sp->in_skb;
721 struct sk_buff *skb = sp->out_skb;
722 struct xfrm_usersa_info *p;
723 struct nlmsghdr *nlh;
724 int err;
725
726 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
727 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
728 if (nlh == NULL)
729 return -EMSGSIZE;
730
731 p = nlmsg_data(nlh);
732
733 err = copy_to_user_state_extra(x, p, skb);
734 if (err)
735 goto nla_put_failure;
736
737 nlmsg_end(skb, nlh);
738 return 0;
739
740 nla_put_failure:
741 nlmsg_cancel(skb, nlh);
742 return err;
743 }
744
745 static int xfrm_dump_sa_done(struct netlink_callback *cb)
746 {
747 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
748 xfrm_state_walk_done(walk);
749 return 0;
750 }
751
752 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
753 {
754 struct net *net = sock_net(skb->sk);
755 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
756 struct xfrm_dump_info info;
757
758 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
759 sizeof(cb->args) - sizeof(cb->args[0]));
760
761 info.in_skb = cb->skb;
762 info.out_skb = skb;
763 info.nlmsg_seq = cb->nlh->nlmsg_seq;
764 info.nlmsg_flags = NLM_F_MULTI;
765
766 if (!cb->args[0]) {
767 cb->args[0] = 1;
768 xfrm_state_walk_init(walk, 0);
769 }
770
771 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
772
773 return skb->len;
774 }
775
776 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
777 struct xfrm_state *x, u32 seq)
778 {
779 struct xfrm_dump_info info;
780 struct sk_buff *skb;
781
782 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
783 if (!skb)
784 return ERR_PTR(-ENOMEM);
785
786 info.in_skb = in_skb;
787 info.out_skb = skb;
788 info.nlmsg_seq = seq;
789 info.nlmsg_flags = 0;
790
791 if (dump_one_state(x, 0, &info)) {
792 kfree_skb(skb);
793 return NULL;
794 }
795
796 return skb;
797 }
798
799 static inline size_t xfrm_spdinfo_msgsize(void)
800 {
801 return NLMSG_ALIGN(4)
802 + nla_total_size(sizeof(struct xfrmu_spdinfo))
803 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
804 }
805
806 static int build_spdinfo(struct sk_buff *skb, struct net *net,
807 u32 pid, u32 seq, u32 flags)
808 {
809 struct xfrmk_spdinfo si;
810 struct xfrmu_spdinfo spc;
811 struct xfrmu_spdhinfo sph;
812 struct nlmsghdr *nlh;
813 u32 *f;
814
815 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
816 if (nlh == NULL) /* shouldnt really happen ... */
817 return -EMSGSIZE;
818
819 f = nlmsg_data(nlh);
820 *f = flags;
821 xfrm_spd_getinfo(net, &si);
822 spc.incnt = si.incnt;
823 spc.outcnt = si.outcnt;
824 spc.fwdcnt = si.fwdcnt;
825 spc.inscnt = si.inscnt;
826 spc.outscnt = si.outscnt;
827 spc.fwdscnt = si.fwdscnt;
828 sph.spdhcnt = si.spdhcnt;
829 sph.spdhmcnt = si.spdhmcnt;
830
831 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
832 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
833
834 return nlmsg_end(skb, nlh);
835
836 nla_put_failure:
837 nlmsg_cancel(skb, nlh);
838 return -EMSGSIZE;
839 }
840
841 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
842 struct nlattr **attrs)
843 {
844 struct net *net = sock_net(skb->sk);
845 struct sk_buff *r_skb;
846 u32 *flags = nlmsg_data(nlh);
847 u32 spid = NETLINK_CB(skb).pid;
848 u32 seq = nlh->nlmsg_seq;
849
850 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
851 if (r_skb == NULL)
852 return -ENOMEM;
853
854 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
855 BUG();
856
857 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
858 }
859
860 static inline size_t xfrm_sadinfo_msgsize(void)
861 {
862 return NLMSG_ALIGN(4)
863 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
864 + nla_total_size(4); /* XFRMA_SAD_CNT */
865 }
866
867 static int build_sadinfo(struct sk_buff *skb, struct net *net,
868 u32 pid, u32 seq, u32 flags)
869 {
870 struct xfrmk_sadinfo si;
871 struct xfrmu_sadhinfo sh;
872 struct nlmsghdr *nlh;
873 u32 *f;
874
875 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
876 if (nlh == NULL) /* shouldnt really happen ... */
877 return -EMSGSIZE;
878
879 f = nlmsg_data(nlh);
880 *f = flags;
881 xfrm_sad_getinfo(net, &si);
882
883 sh.sadhmcnt = si.sadhmcnt;
884 sh.sadhcnt = si.sadhcnt;
885
886 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
887 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
888
889 return nlmsg_end(skb, nlh);
890
891 nla_put_failure:
892 nlmsg_cancel(skb, nlh);
893 return -EMSGSIZE;
894 }
895
896 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
897 struct nlattr **attrs)
898 {
899 struct net *net = sock_net(skb->sk);
900 struct sk_buff *r_skb;
901 u32 *flags = nlmsg_data(nlh);
902 u32 spid = NETLINK_CB(skb).pid;
903 u32 seq = nlh->nlmsg_seq;
904
905 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
906 if (r_skb == NULL)
907 return -ENOMEM;
908
909 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
910 BUG();
911
912 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
913 }
914
915 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
916 struct nlattr **attrs)
917 {
918 struct net *net = sock_net(skb->sk);
919 struct xfrm_usersa_id *p = nlmsg_data(nlh);
920 struct xfrm_state *x;
921 struct sk_buff *resp_skb;
922 int err = -ESRCH;
923
924 x = xfrm_user_state_lookup(net, p, attrs, &err);
925 if (x == NULL)
926 goto out_noput;
927
928 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
929 if (IS_ERR(resp_skb)) {
930 err = PTR_ERR(resp_skb);
931 } else {
932 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
933 }
934 xfrm_state_put(x);
935 out_noput:
936 return err;
937 }
938
939 static int verify_userspi_info(struct xfrm_userspi_info *p)
940 {
941 switch (p->info.id.proto) {
942 case IPPROTO_AH:
943 case IPPROTO_ESP:
944 break;
945
946 case IPPROTO_COMP:
947 /* IPCOMP spi is 16-bits. */
948 if (p->max >= 0x10000)
949 return -EINVAL;
950 break;
951
952 default:
953 return -EINVAL;
954 }
955
956 if (p->min > p->max)
957 return -EINVAL;
958
959 return 0;
960 }
961
962 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
963 struct nlattr **attrs)
964 {
965 struct net *net = sock_net(skb->sk);
966 struct xfrm_state *x;
967 struct xfrm_userspi_info *p;
968 struct sk_buff *resp_skb;
969 xfrm_address_t *daddr;
970 int family;
971 int err;
972 u32 mark;
973 struct xfrm_mark m;
974
975 p = nlmsg_data(nlh);
976 err = verify_userspi_info(p);
977 if (err)
978 goto out_noput;
979
980 family = p->info.family;
981 daddr = &p->info.id.daddr;
982
983 x = NULL;
984
985 mark = xfrm_mark_get(attrs, &m);
986 if (p->info.seq) {
987 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
988 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
989 xfrm_state_put(x);
990 x = NULL;
991 }
992 }
993
994 if (!x)
995 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
996 p->info.id.proto, daddr,
997 &p->info.saddr, 1,
998 family);
999 err = -ENOENT;
1000 if (x == NULL)
1001 goto out_noput;
1002
1003 err = xfrm_alloc_spi(x, p->min, p->max);
1004 if (err)
1005 goto out;
1006
1007 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1008 if (IS_ERR(resp_skb)) {
1009 err = PTR_ERR(resp_skb);
1010 goto out;
1011 }
1012
1013 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1014
1015 out:
1016 xfrm_state_put(x);
1017 out_noput:
1018 return err;
1019 }
1020
1021 static int verify_policy_dir(u8 dir)
1022 {
1023 switch (dir) {
1024 case XFRM_POLICY_IN:
1025 case XFRM_POLICY_OUT:
1026 case XFRM_POLICY_FWD:
1027 break;
1028
1029 default:
1030 return -EINVAL;
1031 }
1032
1033 return 0;
1034 }
1035
1036 static int verify_policy_type(u8 type)
1037 {
1038 switch (type) {
1039 case XFRM_POLICY_TYPE_MAIN:
1040 #ifdef CONFIG_XFRM_SUB_POLICY
1041 case XFRM_POLICY_TYPE_SUB:
1042 #endif
1043 break;
1044
1045 default:
1046 return -EINVAL;
1047 }
1048
1049 return 0;
1050 }
1051
1052 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1053 {
1054 switch (p->share) {
1055 case XFRM_SHARE_ANY:
1056 case XFRM_SHARE_SESSION:
1057 case XFRM_SHARE_USER:
1058 case XFRM_SHARE_UNIQUE:
1059 break;
1060
1061 default:
1062 return -EINVAL;
1063 }
1064
1065 switch (p->action) {
1066 case XFRM_POLICY_ALLOW:
1067 case XFRM_POLICY_BLOCK:
1068 break;
1069
1070 default:
1071 return -EINVAL;
1072 }
1073
1074 switch (p->sel.family) {
1075 case AF_INET:
1076 break;
1077
1078 case AF_INET6:
1079 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1080 break;
1081 #else
1082 return -EAFNOSUPPORT;
1083 #endif
1084
1085 default:
1086 return -EINVAL;
1087 }
1088
1089 return verify_policy_dir(p->dir);
1090 }
1091
1092 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1093 {
1094 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1095 struct xfrm_user_sec_ctx *uctx;
1096
1097 if (!rt)
1098 return 0;
1099
1100 uctx = nla_data(rt);
1101 return security_xfrm_policy_alloc(&pol->security, uctx);
1102 }
1103
1104 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1105 int nr)
1106 {
1107 int i;
1108
1109 xp->xfrm_nr = nr;
1110 for (i = 0; i < nr; i++, ut++) {
1111 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1112
1113 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1114 memcpy(&t->saddr, &ut->saddr,
1115 sizeof(xfrm_address_t));
1116 t->reqid = ut->reqid;
1117 t->mode = ut->mode;
1118 t->share = ut->share;
1119 t->optional = ut->optional;
1120 t->aalgos = ut->aalgos;
1121 t->ealgos = ut->ealgos;
1122 t->calgos = ut->calgos;
1123 /* If all masks are ~0, then we allow all algorithms. */
1124 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1125 t->encap_family = ut->family;
1126 }
1127 }
1128
1129 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1130 {
1131 int i;
1132
1133 if (nr > XFRM_MAX_DEPTH)
1134 return -EINVAL;
1135
1136 for (i = 0; i < nr; i++) {
1137 /* We never validated the ut->family value, so many
1138 * applications simply leave it at zero. The check was
1139 * never made and ut->family was ignored because all
1140 * templates could be assumed to have the same family as
1141 * the policy itself. Now that we will have ipv4-in-ipv6
1142 * and ipv6-in-ipv4 tunnels, this is no longer true.
1143 */
1144 if (!ut[i].family)
1145 ut[i].family = family;
1146
1147 switch (ut[i].family) {
1148 case AF_INET:
1149 break;
1150 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1151 case AF_INET6:
1152 break;
1153 #endif
1154 default:
1155 return -EINVAL;
1156 }
1157 }
1158
1159 return 0;
1160 }
1161
1162 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1163 {
1164 struct nlattr *rt = attrs[XFRMA_TMPL];
1165
1166 if (!rt) {
1167 pol->xfrm_nr = 0;
1168 } else {
1169 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1170 int nr = nla_len(rt) / sizeof(*utmpl);
1171 int err;
1172
1173 err = validate_tmpl(nr, utmpl, pol->family);
1174 if (err)
1175 return err;
1176
1177 copy_templates(pol, utmpl, nr);
1178 }
1179 return 0;
1180 }
1181
1182 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1183 {
1184 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1185 struct xfrm_userpolicy_type *upt;
1186 u8 type = XFRM_POLICY_TYPE_MAIN;
1187 int err;
1188
1189 if (rt) {
1190 upt = nla_data(rt);
1191 type = upt->type;
1192 }
1193
1194 err = verify_policy_type(type);
1195 if (err)
1196 return err;
1197
1198 *tp = type;
1199 return 0;
1200 }
1201
1202 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1203 {
1204 xp->priority = p->priority;
1205 xp->index = p->index;
1206 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1207 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1208 xp->action = p->action;
1209 xp->flags = p->flags;
1210 xp->family = p->sel.family;
1211 /* XXX xp->share = p->share; */
1212 }
1213
1214 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1215 {
1216 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1217 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1218 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1219 p->priority = xp->priority;
1220 p->index = xp->index;
1221 p->sel.family = xp->family;
1222 p->dir = dir;
1223 p->action = xp->action;
1224 p->flags = xp->flags;
1225 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1226 }
1227
1228 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1229 {
1230 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1231 int err;
1232
1233 if (!xp) {
1234 *errp = -ENOMEM;
1235 return NULL;
1236 }
1237
1238 copy_from_user_policy(xp, p);
1239
1240 err = copy_from_user_policy_type(&xp->type, attrs);
1241 if (err)
1242 goto error;
1243
1244 if (!(err = copy_from_user_tmpl(xp, attrs)))
1245 err = copy_from_user_sec_ctx(xp, attrs);
1246 if (err)
1247 goto error;
1248
1249 xfrm_mark_get(attrs, &xp->mark);
1250
1251 return xp;
1252 error:
1253 *errp = err;
1254 xp->walk.dead = 1;
1255 xfrm_policy_destroy(xp);
1256 return NULL;
1257 }
1258
1259 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1260 struct nlattr **attrs)
1261 {
1262 struct net *net = sock_net(skb->sk);
1263 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1264 struct xfrm_policy *xp;
1265 struct km_event c;
1266 int err;
1267 int excl;
1268 uid_t loginuid = NETLINK_CB(skb).loginuid;
1269 u32 sessionid = NETLINK_CB(skb).sessionid;
1270 u32 sid = NETLINK_CB(skb).sid;
1271
1272 err = verify_newpolicy_info(p);
1273 if (err)
1274 return err;
1275 err = verify_sec_ctx_len(attrs);
1276 if (err)
1277 return err;
1278
1279 xp = xfrm_policy_construct(net, p, attrs, &err);
1280 if (!xp)
1281 return err;
1282
1283 /* shouldnt excl be based on nlh flags??
1284 * Aha! this is anti-netlink really i.e more pfkey derived
1285 * in netlink excl is a flag and you wouldnt need
1286 * a type XFRM_MSG_UPDPOLICY - JHS */
1287 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1288 err = xfrm_policy_insert(p->dir, xp, excl);
1289 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1290
1291 if (err) {
1292 security_xfrm_policy_free(xp->security);
1293 kfree(xp);
1294 return err;
1295 }
1296
1297 c.event = nlh->nlmsg_type;
1298 c.seq = nlh->nlmsg_seq;
1299 c.pid = nlh->nlmsg_pid;
1300 km_policy_notify(xp, p->dir, &c);
1301
1302 xfrm_pol_put(xp);
1303
1304 return 0;
1305 }
1306
1307 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1308 {
1309 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1310 int i;
1311
1312 if (xp->xfrm_nr == 0)
1313 return 0;
1314
1315 for (i = 0; i < xp->xfrm_nr; i++) {
1316 struct xfrm_user_tmpl *up = &vec[i];
1317 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1318
1319 memcpy(&up->id, &kp->id, sizeof(up->id));
1320 up->family = kp->encap_family;
1321 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1322 up->reqid = kp->reqid;
1323 up->mode = kp->mode;
1324 up->share = kp->share;
1325 up->optional = kp->optional;
1326 up->aalgos = kp->aalgos;
1327 up->ealgos = kp->ealgos;
1328 up->calgos = kp->calgos;
1329 }
1330
1331 return nla_put(skb, XFRMA_TMPL,
1332 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1333 }
1334
1335 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1336 {
1337 if (x->security) {
1338 return copy_sec_ctx(x->security, skb);
1339 }
1340 return 0;
1341 }
1342
1343 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1344 {
1345 if (xp->security) {
1346 return copy_sec_ctx(xp->security, skb);
1347 }
1348 return 0;
1349 }
1350 static inline size_t userpolicy_type_attrsize(void)
1351 {
1352 #ifdef CONFIG_XFRM_SUB_POLICY
1353 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1354 #else
1355 return 0;
1356 #endif
1357 }
1358
1359 #ifdef CONFIG_XFRM_SUB_POLICY
1360 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1361 {
1362 struct xfrm_userpolicy_type upt = {
1363 .type = type,
1364 };
1365
1366 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1367 }
1368
1369 #else
1370 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1371 {
1372 return 0;
1373 }
1374 #endif
1375
1376 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1377 {
1378 struct xfrm_dump_info *sp = ptr;
1379 struct xfrm_userpolicy_info *p;
1380 struct sk_buff *in_skb = sp->in_skb;
1381 struct sk_buff *skb = sp->out_skb;
1382 struct nlmsghdr *nlh;
1383
1384 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1385 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1386 if (nlh == NULL)
1387 return -EMSGSIZE;
1388
1389 p = nlmsg_data(nlh);
1390 copy_to_user_policy(xp, p, dir);
1391 if (copy_to_user_tmpl(xp, skb) < 0)
1392 goto nlmsg_failure;
1393 if (copy_to_user_sec_ctx(xp, skb))
1394 goto nlmsg_failure;
1395 if (copy_to_user_policy_type(xp->type, skb) < 0)
1396 goto nlmsg_failure;
1397 if (xfrm_mark_put(skb, &xp->mark))
1398 goto nla_put_failure;
1399
1400 nlmsg_end(skb, nlh);
1401 return 0;
1402
1403 nla_put_failure:
1404 nlmsg_failure:
1405 nlmsg_cancel(skb, nlh);
1406 return -EMSGSIZE;
1407 }
1408
1409 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1410 {
1411 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1412
1413 xfrm_policy_walk_done(walk);
1414 return 0;
1415 }
1416
1417 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1418 {
1419 struct net *net = sock_net(skb->sk);
1420 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1421 struct xfrm_dump_info info;
1422
1423 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1424 sizeof(cb->args) - sizeof(cb->args[0]));
1425
1426 info.in_skb = cb->skb;
1427 info.out_skb = skb;
1428 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1429 info.nlmsg_flags = NLM_F_MULTI;
1430
1431 if (!cb->args[0]) {
1432 cb->args[0] = 1;
1433 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1434 }
1435
1436 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1437
1438 return skb->len;
1439 }
1440
1441 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1442 struct xfrm_policy *xp,
1443 int dir, u32 seq)
1444 {
1445 struct xfrm_dump_info info;
1446 struct sk_buff *skb;
1447
1448 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1449 if (!skb)
1450 return ERR_PTR(-ENOMEM);
1451
1452 info.in_skb = in_skb;
1453 info.out_skb = skb;
1454 info.nlmsg_seq = seq;
1455 info.nlmsg_flags = 0;
1456
1457 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1458 kfree_skb(skb);
1459 return NULL;
1460 }
1461
1462 return skb;
1463 }
1464
1465 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1466 struct nlattr **attrs)
1467 {
1468 struct net *net = sock_net(skb->sk);
1469 struct xfrm_policy *xp;
1470 struct xfrm_userpolicy_id *p;
1471 u8 type = XFRM_POLICY_TYPE_MAIN;
1472 int err;
1473 struct km_event c;
1474 int delete;
1475 struct xfrm_mark m;
1476 u32 mark = xfrm_mark_get(attrs, &m);
1477
1478 p = nlmsg_data(nlh);
1479 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1480
1481 err = copy_from_user_policy_type(&type, attrs);
1482 if (err)
1483 return err;
1484
1485 err = verify_policy_dir(p->dir);
1486 if (err)
1487 return err;
1488
1489 if (p->index)
1490 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1491 else {
1492 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1493 struct xfrm_sec_ctx *ctx;
1494
1495 err = verify_sec_ctx_len(attrs);
1496 if (err)
1497 return err;
1498
1499 ctx = NULL;
1500 if (rt) {
1501 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1502
1503 err = security_xfrm_policy_alloc(&ctx, uctx);
1504 if (err)
1505 return err;
1506 }
1507 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1508 ctx, delete, &err);
1509 security_xfrm_policy_free(ctx);
1510 }
1511 if (xp == NULL)
1512 return -ENOENT;
1513
1514 if (!delete) {
1515 struct sk_buff *resp_skb;
1516
1517 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1518 if (IS_ERR(resp_skb)) {
1519 err = PTR_ERR(resp_skb);
1520 } else {
1521 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1522 NETLINK_CB(skb).pid);
1523 }
1524 } else {
1525 uid_t loginuid = NETLINK_CB(skb).loginuid;
1526 u32 sessionid = NETLINK_CB(skb).sessionid;
1527 u32 sid = NETLINK_CB(skb).sid;
1528
1529 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1530 sid);
1531
1532 if (err != 0)
1533 goto out;
1534
1535 c.data.byid = p->index;
1536 c.event = nlh->nlmsg_type;
1537 c.seq = nlh->nlmsg_seq;
1538 c.pid = nlh->nlmsg_pid;
1539 km_policy_notify(xp, p->dir, &c);
1540 }
1541
1542 out:
1543 xfrm_pol_put(xp);
1544 return err;
1545 }
1546
1547 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1548 struct nlattr **attrs)
1549 {
1550 struct net *net = sock_net(skb->sk);
1551 struct km_event c;
1552 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1553 struct xfrm_audit audit_info;
1554 int err;
1555
1556 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1557 audit_info.sessionid = NETLINK_CB(skb).sessionid;
1558 audit_info.secid = NETLINK_CB(skb).sid;
1559 err = xfrm_state_flush(net, p->proto, &audit_info);
1560 if (err) {
1561 if (err == -ESRCH) /* empty table */
1562 return 0;
1563 return err;
1564 }
1565 c.data.proto = p->proto;
1566 c.event = nlh->nlmsg_type;
1567 c.seq = nlh->nlmsg_seq;
1568 c.pid = nlh->nlmsg_pid;
1569 c.net = net;
1570 km_state_notify(NULL, &c);
1571
1572 return 0;
1573 }
1574
1575 static inline size_t xfrm_aevent_msgsize(void)
1576 {
1577 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1578 + nla_total_size(sizeof(struct xfrm_replay_state))
1579 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1580 + nla_total_size(sizeof(struct xfrm_mark))
1581 + nla_total_size(4) /* XFRM_AE_RTHR */
1582 + nla_total_size(4); /* XFRM_AE_ETHR */
1583 }
1584
1585 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1586 {
1587 struct xfrm_aevent_id *id;
1588 struct nlmsghdr *nlh;
1589
1590 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1591 if (nlh == NULL)
1592 return -EMSGSIZE;
1593
1594 id = nlmsg_data(nlh);
1595 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1596 id->sa_id.spi = x->id.spi;
1597 id->sa_id.family = x->props.family;
1598 id->sa_id.proto = x->id.proto;
1599 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1600 id->reqid = x->props.reqid;
1601 id->flags = c->data.aevent;
1602
1603 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1604 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1605
1606 if (id->flags & XFRM_AE_RTHR)
1607 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1608
1609 if (id->flags & XFRM_AE_ETHR)
1610 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1611 x->replay_maxage * 10 / HZ);
1612
1613 if (xfrm_mark_put(skb, &x->mark))
1614 goto nla_put_failure;
1615
1616 return nlmsg_end(skb, nlh);
1617
1618 nla_put_failure:
1619 nlmsg_cancel(skb, nlh);
1620 return -EMSGSIZE;
1621 }
1622
1623 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1624 struct nlattr **attrs)
1625 {
1626 struct net *net = sock_net(skb->sk);
1627 struct xfrm_state *x;
1628 struct sk_buff *r_skb;
1629 int err;
1630 struct km_event c;
1631 u32 mark;
1632 struct xfrm_mark m;
1633 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1634 struct xfrm_usersa_id *id = &p->sa_id;
1635
1636 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1637 if (r_skb == NULL)
1638 return -ENOMEM;
1639
1640 mark = xfrm_mark_get(attrs, &m);
1641
1642 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1643 if (x == NULL) {
1644 kfree_skb(r_skb);
1645 return -ESRCH;
1646 }
1647
1648 /*
1649 * XXX: is this lock really needed - none of the other
1650 * gets lock (the concern is things getting updated
1651 * while we are still reading) - jhs
1652 */
1653 spin_lock_bh(&x->lock);
1654 c.data.aevent = p->flags;
1655 c.seq = nlh->nlmsg_seq;
1656 c.pid = nlh->nlmsg_pid;
1657
1658 if (build_aevent(r_skb, x, &c) < 0)
1659 BUG();
1660 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1661 spin_unlock_bh(&x->lock);
1662 xfrm_state_put(x);
1663 return err;
1664 }
1665
1666 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1667 struct nlattr **attrs)
1668 {
1669 struct net *net = sock_net(skb->sk);
1670 struct xfrm_state *x;
1671 struct km_event c;
1672 int err = - EINVAL;
1673 u32 mark = 0;
1674 struct xfrm_mark m;
1675 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1676 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1677 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1678
1679 if (!lt && !rp)
1680 return err;
1681
1682 /* pedantic mode - thou shalt sayeth replaceth */
1683 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1684 return err;
1685
1686 mark = xfrm_mark_get(attrs, &m);
1687
1688 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1689 if (x == NULL)
1690 return -ESRCH;
1691
1692 if (x->km.state != XFRM_STATE_VALID)
1693 goto out;
1694
1695 spin_lock_bh(&x->lock);
1696 xfrm_update_ae_params(x, attrs);
1697 spin_unlock_bh(&x->lock);
1698
1699 c.event = nlh->nlmsg_type;
1700 c.seq = nlh->nlmsg_seq;
1701 c.pid = nlh->nlmsg_pid;
1702 c.data.aevent = XFRM_AE_CU;
1703 km_state_notify(x, &c);
1704 err = 0;
1705 out:
1706 xfrm_state_put(x);
1707 return err;
1708 }
1709
1710 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1711 struct nlattr **attrs)
1712 {
1713 struct net *net = sock_net(skb->sk);
1714 struct km_event c;
1715 u8 type = XFRM_POLICY_TYPE_MAIN;
1716 int err;
1717 struct xfrm_audit audit_info;
1718
1719 err = copy_from_user_policy_type(&type, attrs);
1720 if (err)
1721 return err;
1722
1723 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1724 audit_info.sessionid = NETLINK_CB(skb).sessionid;
1725 audit_info.secid = NETLINK_CB(skb).sid;
1726 err = xfrm_policy_flush(net, type, &audit_info);
1727 if (err) {
1728 if (err == -ESRCH) /* empty table */
1729 return 0;
1730 return err;
1731 }
1732
1733 c.data.type = type;
1734 c.event = nlh->nlmsg_type;
1735 c.seq = nlh->nlmsg_seq;
1736 c.pid = nlh->nlmsg_pid;
1737 c.net = net;
1738 km_policy_notify(NULL, 0, &c);
1739 return 0;
1740 }
1741
1742 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1743 struct nlattr **attrs)
1744 {
1745 struct net *net = sock_net(skb->sk);
1746 struct xfrm_policy *xp;
1747 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1748 struct xfrm_userpolicy_info *p = &up->pol;
1749 u8 type = XFRM_POLICY_TYPE_MAIN;
1750 int err = -ENOENT;
1751 struct xfrm_mark m;
1752 u32 mark = xfrm_mark_get(attrs, &m);
1753
1754 err = copy_from_user_policy_type(&type, attrs);
1755 if (err)
1756 return err;
1757
1758 err = verify_policy_dir(p->dir);
1759 if (err)
1760 return err;
1761
1762 if (p->index)
1763 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1764 else {
1765 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1766 struct xfrm_sec_ctx *ctx;
1767
1768 err = verify_sec_ctx_len(attrs);
1769 if (err)
1770 return err;
1771
1772 ctx = NULL;
1773 if (rt) {
1774 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1775
1776 err = security_xfrm_policy_alloc(&ctx, uctx);
1777 if (err)
1778 return err;
1779 }
1780 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1781 &p->sel, ctx, 0, &err);
1782 security_xfrm_policy_free(ctx);
1783 }
1784 if (xp == NULL)
1785 return -ENOENT;
1786
1787 if (unlikely(xp->walk.dead))
1788 goto out;
1789
1790 err = 0;
1791 if (up->hard) {
1792 uid_t loginuid = NETLINK_CB(skb).loginuid;
1793 uid_t sessionid = NETLINK_CB(skb).sessionid;
1794 u32 sid = NETLINK_CB(skb).sid;
1795 xfrm_policy_delete(xp, p->dir);
1796 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1797
1798 } else {
1799 // reset the timers here?
1800 WARN(1, "Dont know what to do with soft policy expire\n");
1801 }
1802 km_policy_expired(xp, p->dir, up->hard, current->pid);
1803
1804 out:
1805 xfrm_pol_put(xp);
1806 return err;
1807 }
1808
1809 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1810 struct nlattr **attrs)
1811 {
1812 struct net *net = sock_net(skb->sk);
1813 struct xfrm_state *x;
1814 int err;
1815 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1816 struct xfrm_usersa_info *p = &ue->state;
1817 struct xfrm_mark m;
1818 u32 mark = xfrm_mark_get(attrs, &m);
1819
1820 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1821
1822 err = -ENOENT;
1823 if (x == NULL)
1824 return err;
1825
1826 spin_lock_bh(&x->lock);
1827 err = -EINVAL;
1828 if (x->km.state != XFRM_STATE_VALID)
1829 goto out;
1830 km_state_expired(x, ue->hard, current->pid);
1831
1832 if (ue->hard) {
1833 uid_t loginuid = NETLINK_CB(skb).loginuid;
1834 uid_t sessionid = NETLINK_CB(skb).sessionid;
1835 u32 sid = NETLINK_CB(skb).sid;
1836 __xfrm_state_delete(x);
1837 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1838 }
1839 err = 0;
1840 out:
1841 spin_unlock_bh(&x->lock);
1842 xfrm_state_put(x);
1843 return err;
1844 }
1845
1846 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1847 struct nlattr **attrs)
1848 {
1849 struct net *net = sock_net(skb->sk);
1850 struct xfrm_policy *xp;
1851 struct xfrm_user_tmpl *ut;
1852 int i;
1853 struct nlattr *rt = attrs[XFRMA_TMPL];
1854 struct xfrm_mark mark;
1855
1856 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1857 struct xfrm_state *x = xfrm_state_alloc(net);
1858 int err = -ENOMEM;
1859
1860 if (!x)
1861 goto nomem;
1862
1863 xfrm_mark_get(attrs, &mark);
1864
1865 err = verify_newpolicy_info(&ua->policy);
1866 if (err)
1867 goto bad_policy;
1868
1869 /* build an XP */
1870 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
1871 if (!xp)
1872 goto free_state;
1873
1874 memcpy(&x->id, &ua->id, sizeof(ua->id));
1875 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1876 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1877 xp->mark.m = x->mark.m = mark.m;
1878 xp->mark.v = x->mark.v = mark.v;
1879 ut = nla_data(rt);
1880 /* extract the templates and for each call km_key */
1881 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1882 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1883 memcpy(&x->id, &t->id, sizeof(x->id));
1884 x->props.mode = t->mode;
1885 x->props.reqid = t->reqid;
1886 x->props.family = ut->family;
1887 t->aalgos = ua->aalgos;
1888 t->ealgos = ua->ealgos;
1889 t->calgos = ua->calgos;
1890 err = km_query(x, t, xp);
1891
1892 }
1893
1894 kfree(x);
1895 kfree(xp);
1896
1897 return 0;
1898
1899 bad_policy:
1900 WARN(1, "BAD policy passed\n");
1901 free_state:
1902 kfree(x);
1903 nomem:
1904 return err;
1905 }
1906
1907 #ifdef CONFIG_XFRM_MIGRATE
1908 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1909 struct xfrm_kmaddress *k,
1910 struct nlattr **attrs, int *num)
1911 {
1912 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1913 struct xfrm_user_migrate *um;
1914 int i, num_migrate;
1915
1916 if (k != NULL) {
1917 struct xfrm_user_kmaddress *uk;
1918
1919 uk = nla_data(attrs[XFRMA_KMADDRESS]);
1920 memcpy(&k->local, &uk->local, sizeof(k->local));
1921 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
1922 k->family = uk->family;
1923 k->reserved = uk->reserved;
1924 }
1925
1926 um = nla_data(rt);
1927 num_migrate = nla_len(rt) / sizeof(*um);
1928
1929 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1930 return -EINVAL;
1931
1932 for (i = 0; i < num_migrate; i++, um++, ma++) {
1933 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1934 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1935 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1936 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1937
1938 ma->proto = um->proto;
1939 ma->mode = um->mode;
1940 ma->reqid = um->reqid;
1941
1942 ma->old_family = um->old_family;
1943 ma->new_family = um->new_family;
1944 }
1945
1946 *num = i;
1947 return 0;
1948 }
1949
1950 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1951 struct nlattr **attrs)
1952 {
1953 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1954 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1955 struct xfrm_kmaddress km, *kmp;
1956 u8 type;
1957 int err;
1958 int n = 0;
1959
1960 if (attrs[XFRMA_MIGRATE] == NULL)
1961 return -EINVAL;
1962
1963 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
1964
1965 err = copy_from_user_policy_type(&type, attrs);
1966 if (err)
1967 return err;
1968
1969 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
1970 if (err)
1971 return err;
1972
1973 if (!n)
1974 return 0;
1975
1976 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
1977
1978 return 0;
1979 }
1980 #else
1981 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1982 struct nlattr **attrs)
1983 {
1984 return -ENOPROTOOPT;
1985 }
1986 #endif
1987
1988 #ifdef CONFIG_XFRM_MIGRATE
1989 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1990 {
1991 struct xfrm_user_migrate um;
1992
1993 memset(&um, 0, sizeof(um));
1994 um.proto = m->proto;
1995 um.mode = m->mode;
1996 um.reqid = m->reqid;
1997 um.old_family = m->old_family;
1998 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1999 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2000 um.new_family = m->new_family;
2001 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2002 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2003
2004 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2005 }
2006
2007 static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
2008 {
2009 struct xfrm_user_kmaddress uk;
2010
2011 memset(&uk, 0, sizeof(uk));
2012 uk.family = k->family;
2013 uk.reserved = k->reserved;
2014 memcpy(&uk.local, &k->local, sizeof(uk.local));
2015 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2016
2017 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2018 }
2019
2020 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2021 {
2022 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2023 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2024 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2025 + userpolicy_type_attrsize();
2026 }
2027
2028 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
2029 int num_migrate, struct xfrm_kmaddress *k,
2030 struct xfrm_selector *sel, u8 dir, u8 type)
2031 {
2032 struct xfrm_migrate *mp;
2033 struct xfrm_userpolicy_id *pol_id;
2034 struct nlmsghdr *nlh;
2035 int i;
2036
2037 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2038 if (nlh == NULL)
2039 return -EMSGSIZE;
2040
2041 pol_id = nlmsg_data(nlh);
2042 /* copy data from selector, dir, and type to the pol_id */
2043 memset(pol_id, 0, sizeof(*pol_id));
2044 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2045 pol_id->dir = dir;
2046
2047 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
2048 goto nlmsg_failure;
2049
2050 if (copy_to_user_policy_type(type, skb) < 0)
2051 goto nlmsg_failure;
2052
2053 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2054 if (copy_to_user_migrate(mp, skb) < 0)
2055 goto nlmsg_failure;
2056 }
2057
2058 return nlmsg_end(skb, nlh);
2059 nlmsg_failure:
2060 nlmsg_cancel(skb, nlh);
2061 return -EMSGSIZE;
2062 }
2063
2064 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2065 struct xfrm_migrate *m, int num_migrate,
2066 struct xfrm_kmaddress *k)
2067 {
2068 struct net *net = &init_net;
2069 struct sk_buff *skb;
2070
2071 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2072 if (skb == NULL)
2073 return -ENOMEM;
2074
2075 /* build migrate */
2076 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2077 BUG();
2078
2079 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2080 }
2081 #else
2082 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2083 struct xfrm_migrate *m, int num_migrate,
2084 struct xfrm_kmaddress *k)
2085 {
2086 return -ENOPROTOOPT;
2087 }
2088 #endif
2089
2090 #define XMSGSIZE(type) sizeof(struct type)
2091
2092 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2093 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2094 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2095 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2096 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2097 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2098 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2099 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2100 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2101 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2102 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2103 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2104 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2105 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2106 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2107 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2108 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2109 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2110 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2111 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2112 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2113 };
2114
2115 #undef XMSGSIZE
2116
2117 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2118 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2119 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2120 [XFRMA_LASTUSED] = { .type = NLA_U64},
2121 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2122 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2123 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2124 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2125 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2126 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2127 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2128 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2129 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2130 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2131 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2132 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2133 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2134 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2135 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2136 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2137 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2138 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2139 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2140 };
2141
2142 static struct xfrm_link {
2143 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2144 int (*dump)(struct sk_buff *, struct netlink_callback *);
2145 int (*done)(struct netlink_callback *);
2146 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2147 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2148 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2149 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2150 .dump = xfrm_dump_sa,
2151 .done = xfrm_dump_sa_done },
2152 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2153 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2154 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2155 .dump = xfrm_dump_policy,
2156 .done = xfrm_dump_policy_done },
2157 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2158 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2159 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2160 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2161 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2162 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2163 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2164 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2165 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2166 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2167 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2168 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2169 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2170 };
2171
2172 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2173 {
2174 struct net *net = sock_net(skb->sk);
2175 struct nlattr *attrs[XFRMA_MAX+1];
2176 struct xfrm_link *link;
2177 int type, err;
2178
2179 type = nlh->nlmsg_type;
2180 if (type > XFRM_MSG_MAX)
2181 return -EINVAL;
2182
2183 type -= XFRM_MSG_BASE;
2184 link = &xfrm_dispatch[type];
2185
2186 /* All operations require privileges, even GET */
2187 if (security_netlink_recv(skb, CAP_NET_ADMIN))
2188 return -EPERM;
2189
2190 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2191 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2192 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2193 if (link->dump == NULL)
2194 return -EINVAL;
2195
2196 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done);
2197 }
2198
2199 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2200 xfrma_policy);
2201 if (err < 0)
2202 return err;
2203
2204 if (link->doit == NULL)
2205 return -EINVAL;
2206
2207 return link->doit(skb, nlh, attrs);
2208 }
2209
2210 static void xfrm_netlink_rcv(struct sk_buff *skb)
2211 {
2212 mutex_lock(&xfrm_cfg_mutex);
2213 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2214 mutex_unlock(&xfrm_cfg_mutex);
2215 }
2216
2217 static inline size_t xfrm_expire_msgsize(void)
2218 {
2219 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2220 + nla_total_size(sizeof(struct xfrm_mark));
2221 }
2222
2223 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
2224 {
2225 struct xfrm_user_expire *ue;
2226 struct nlmsghdr *nlh;
2227
2228 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2229 if (nlh == NULL)
2230 return -EMSGSIZE;
2231
2232 ue = nlmsg_data(nlh);
2233 copy_to_user_state(x, &ue->state);
2234 ue->hard = (c->data.hard != 0) ? 1 : 0;
2235
2236 if (xfrm_mark_put(skb, &x->mark))
2237 goto nla_put_failure;
2238
2239 return nlmsg_end(skb, nlh);
2240
2241 nla_put_failure:
2242 return -EMSGSIZE;
2243 }
2244
2245 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
2246 {
2247 struct net *net = xs_net(x);
2248 struct sk_buff *skb;
2249
2250 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2251 if (skb == NULL)
2252 return -ENOMEM;
2253
2254 if (build_expire(skb, x, c) < 0) {
2255 kfree_skb(skb);
2256 return -EMSGSIZE;
2257 }
2258
2259 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2260 }
2261
2262 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2263 {
2264 struct net *net = xs_net(x);
2265 struct sk_buff *skb;
2266
2267 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2268 if (skb == NULL)
2269 return -ENOMEM;
2270
2271 if (build_aevent(skb, x, c) < 0)
2272 BUG();
2273
2274 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2275 }
2276
2277 static int xfrm_notify_sa_flush(struct km_event *c)
2278 {
2279 struct net *net = c->net;
2280 struct xfrm_usersa_flush *p;
2281 struct nlmsghdr *nlh;
2282 struct sk_buff *skb;
2283 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2284
2285 skb = nlmsg_new(len, GFP_ATOMIC);
2286 if (skb == NULL)
2287 return -ENOMEM;
2288
2289 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2290 if (nlh == NULL) {
2291 kfree_skb(skb);
2292 return -EMSGSIZE;
2293 }
2294
2295 p = nlmsg_data(nlh);
2296 p->proto = c->data.proto;
2297
2298 nlmsg_end(skb, nlh);
2299
2300 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2301 }
2302
2303 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2304 {
2305 size_t l = 0;
2306 if (x->aead)
2307 l += nla_total_size(aead_len(x->aead));
2308 if (x->aalg) {
2309 l += nla_total_size(sizeof(struct xfrm_algo) +
2310 (x->aalg->alg_key_len + 7) / 8);
2311 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2312 }
2313 if (x->ealg)
2314 l += nla_total_size(xfrm_alg_len(x->ealg));
2315 if (x->calg)
2316 l += nla_total_size(sizeof(*x->calg));
2317 if (x->encap)
2318 l += nla_total_size(sizeof(*x->encap));
2319 if (x->tfcpad)
2320 l += nla_total_size(sizeof(x->tfcpad));
2321 if (x->security)
2322 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2323 x->security->ctx_len);
2324 if (x->coaddr)
2325 l += nla_total_size(sizeof(*x->coaddr));
2326
2327 /* Must count x->lastused as it may become non-zero behind our back. */
2328 l += nla_total_size(sizeof(u64));
2329
2330 return l;
2331 }
2332
2333 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2334 {
2335 struct net *net = xs_net(x);
2336 struct xfrm_usersa_info *p;
2337 struct xfrm_usersa_id *id;
2338 struct nlmsghdr *nlh;
2339 struct sk_buff *skb;
2340 int len = xfrm_sa_len(x);
2341 int headlen;
2342
2343 headlen = sizeof(*p);
2344 if (c->event == XFRM_MSG_DELSA) {
2345 len += nla_total_size(headlen);
2346 headlen = sizeof(*id);
2347 len += nla_total_size(sizeof(struct xfrm_mark));
2348 }
2349 len += NLMSG_ALIGN(headlen);
2350
2351 skb = nlmsg_new(len, GFP_ATOMIC);
2352 if (skb == NULL)
2353 return -ENOMEM;
2354
2355 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2356 if (nlh == NULL)
2357 goto nla_put_failure;
2358
2359 p = nlmsg_data(nlh);
2360 if (c->event == XFRM_MSG_DELSA) {
2361 struct nlattr *attr;
2362
2363 id = nlmsg_data(nlh);
2364 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2365 id->spi = x->id.spi;
2366 id->family = x->props.family;
2367 id->proto = x->id.proto;
2368
2369 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2370 if (attr == NULL)
2371 goto nla_put_failure;
2372
2373 p = nla_data(attr);
2374 }
2375
2376 if (copy_to_user_state_extra(x, p, skb))
2377 goto nla_put_failure;
2378
2379 nlmsg_end(skb, nlh);
2380
2381 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2382
2383 nla_put_failure:
2384 /* Somebody screwed up with xfrm_sa_len! */
2385 WARN_ON(1);
2386 kfree_skb(skb);
2387 return -1;
2388 }
2389
2390 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2391 {
2392
2393 switch (c->event) {
2394 case XFRM_MSG_EXPIRE:
2395 return xfrm_exp_state_notify(x, c);
2396 case XFRM_MSG_NEWAE:
2397 return xfrm_aevent_state_notify(x, c);
2398 case XFRM_MSG_DELSA:
2399 case XFRM_MSG_UPDSA:
2400 case XFRM_MSG_NEWSA:
2401 return xfrm_notify_sa(x, c);
2402 case XFRM_MSG_FLUSHSA:
2403 return xfrm_notify_sa_flush(c);
2404 default:
2405 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2406 c->event);
2407 break;
2408 }
2409
2410 return 0;
2411
2412 }
2413
2414 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2415 struct xfrm_policy *xp)
2416 {
2417 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2418 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2419 + nla_total_size(sizeof(struct xfrm_mark))
2420 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2421 + userpolicy_type_attrsize();
2422 }
2423
2424 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2425 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2426 int dir)
2427 {
2428 struct xfrm_user_acquire *ua;
2429 struct nlmsghdr *nlh;
2430 __u32 seq = xfrm_get_acqseq();
2431
2432 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2433 if (nlh == NULL)
2434 return -EMSGSIZE;
2435
2436 ua = nlmsg_data(nlh);
2437 memcpy(&ua->id, &x->id, sizeof(ua->id));
2438 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2439 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2440 copy_to_user_policy(xp, &ua->policy, dir);
2441 ua->aalgos = xt->aalgos;
2442 ua->ealgos = xt->ealgos;
2443 ua->calgos = xt->calgos;
2444 ua->seq = x->km.seq = seq;
2445
2446 if (copy_to_user_tmpl(xp, skb) < 0)
2447 goto nlmsg_failure;
2448 if (copy_to_user_state_sec_ctx(x, skb))
2449 goto nlmsg_failure;
2450 if (copy_to_user_policy_type(xp->type, skb) < 0)
2451 goto nlmsg_failure;
2452 if (xfrm_mark_put(skb, &xp->mark))
2453 goto nla_put_failure;
2454
2455 return nlmsg_end(skb, nlh);
2456
2457 nla_put_failure:
2458 nlmsg_failure:
2459 nlmsg_cancel(skb, nlh);
2460 return -EMSGSIZE;
2461 }
2462
2463 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2464 struct xfrm_policy *xp, int dir)
2465 {
2466 struct net *net = xs_net(x);
2467 struct sk_buff *skb;
2468
2469 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2470 if (skb == NULL)
2471 return -ENOMEM;
2472
2473 if (build_acquire(skb, x, xt, xp, dir) < 0)
2474 BUG();
2475
2476 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2477 }
2478
2479 /* User gives us xfrm_user_policy_info followed by an array of 0
2480 * or more templates.
2481 */
2482 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2483 u8 *data, int len, int *dir)
2484 {
2485 struct net *net = sock_net(sk);
2486 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2487 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2488 struct xfrm_policy *xp;
2489 int nr;
2490
2491 switch (sk->sk_family) {
2492 case AF_INET:
2493 if (opt != IP_XFRM_POLICY) {
2494 *dir = -EOPNOTSUPP;
2495 return NULL;
2496 }
2497 break;
2498 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2499 case AF_INET6:
2500 if (opt != IPV6_XFRM_POLICY) {
2501 *dir = -EOPNOTSUPP;
2502 return NULL;
2503 }
2504 break;
2505 #endif
2506 default:
2507 *dir = -EINVAL;
2508 return NULL;
2509 }
2510
2511 *dir = -EINVAL;
2512
2513 if (len < sizeof(*p) ||
2514 verify_newpolicy_info(p))
2515 return NULL;
2516
2517 nr = ((len - sizeof(*p)) / sizeof(*ut));
2518 if (validate_tmpl(nr, ut, p->sel.family))
2519 return NULL;
2520
2521 if (p->dir > XFRM_POLICY_OUT)
2522 return NULL;
2523
2524 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2525 if (xp == NULL) {
2526 *dir = -ENOBUFS;
2527 return NULL;
2528 }
2529
2530 copy_from_user_policy(xp, p);
2531 xp->type = XFRM_POLICY_TYPE_MAIN;
2532 copy_templates(xp, ut, nr);
2533
2534 *dir = p->dir;
2535
2536 return xp;
2537 }
2538
2539 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2540 {
2541 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2542 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2543 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2544 + nla_total_size(sizeof(struct xfrm_mark))
2545 + userpolicy_type_attrsize();
2546 }
2547
2548 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2549 int dir, struct km_event *c)
2550 {
2551 struct xfrm_user_polexpire *upe;
2552 struct nlmsghdr *nlh;
2553 int hard = c->data.hard;
2554
2555 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2556 if (nlh == NULL)
2557 return -EMSGSIZE;
2558
2559 upe = nlmsg_data(nlh);
2560 copy_to_user_policy(xp, &upe->pol, dir);
2561 if (copy_to_user_tmpl(xp, skb) < 0)
2562 goto nlmsg_failure;
2563 if (copy_to_user_sec_ctx(xp, skb))
2564 goto nlmsg_failure;
2565 if (copy_to_user_policy_type(xp->type, skb) < 0)
2566 goto nlmsg_failure;
2567 if (xfrm_mark_put(skb, &xp->mark))
2568 goto nla_put_failure;
2569 upe->hard = !!hard;
2570
2571 return nlmsg_end(skb, nlh);
2572
2573 nla_put_failure:
2574 nlmsg_failure:
2575 nlmsg_cancel(skb, nlh);
2576 return -EMSGSIZE;
2577 }
2578
2579 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2580 {
2581 struct net *net = xp_net(xp);
2582 struct sk_buff *skb;
2583
2584 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2585 if (skb == NULL)
2586 return -ENOMEM;
2587
2588 if (build_polexpire(skb, xp, dir, c) < 0)
2589 BUG();
2590
2591 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2592 }
2593
2594 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2595 {
2596 struct net *net = xp_net(xp);
2597 struct xfrm_userpolicy_info *p;
2598 struct xfrm_userpolicy_id *id;
2599 struct nlmsghdr *nlh;
2600 struct sk_buff *skb;
2601 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2602 int headlen;
2603
2604 headlen = sizeof(*p);
2605 if (c->event == XFRM_MSG_DELPOLICY) {
2606 len += nla_total_size(headlen);
2607 headlen = sizeof(*id);
2608 }
2609 len += userpolicy_type_attrsize();
2610 len += nla_total_size(sizeof(struct xfrm_mark));
2611 len += NLMSG_ALIGN(headlen);
2612
2613 skb = nlmsg_new(len, GFP_ATOMIC);
2614 if (skb == NULL)
2615 return -ENOMEM;
2616
2617 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2618 if (nlh == NULL)
2619 goto nlmsg_failure;
2620
2621 p = nlmsg_data(nlh);
2622 if (c->event == XFRM_MSG_DELPOLICY) {
2623 struct nlattr *attr;
2624
2625 id = nlmsg_data(nlh);
2626 memset(id, 0, sizeof(*id));
2627 id->dir = dir;
2628 if (c->data.byid)
2629 id->index = xp->index;
2630 else
2631 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2632
2633 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2634 if (attr == NULL)
2635 goto nlmsg_failure;
2636
2637 p = nla_data(attr);
2638 }
2639
2640 copy_to_user_policy(xp, p, dir);
2641 if (copy_to_user_tmpl(xp, skb) < 0)
2642 goto nlmsg_failure;
2643 if (copy_to_user_policy_type(xp->type, skb) < 0)
2644 goto nlmsg_failure;
2645
2646 if (xfrm_mark_put(skb, &xp->mark))
2647 goto nla_put_failure;
2648
2649 nlmsg_end(skb, nlh);
2650
2651 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2652
2653 nla_put_failure:
2654 nlmsg_failure:
2655 kfree_skb(skb);
2656 return -1;
2657 }
2658
2659 static int xfrm_notify_policy_flush(struct km_event *c)
2660 {
2661 struct net *net = c->net;
2662 struct nlmsghdr *nlh;
2663 struct sk_buff *skb;
2664
2665 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2666 if (skb == NULL)
2667 return -ENOMEM;
2668
2669 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2670 if (nlh == NULL)
2671 goto nlmsg_failure;
2672 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2673 goto nlmsg_failure;
2674
2675 nlmsg_end(skb, nlh);
2676
2677 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2678
2679 nlmsg_failure:
2680 kfree_skb(skb);
2681 return -1;
2682 }
2683
2684 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2685 {
2686
2687 switch (c->event) {
2688 case XFRM_MSG_NEWPOLICY:
2689 case XFRM_MSG_UPDPOLICY:
2690 case XFRM_MSG_DELPOLICY:
2691 return xfrm_notify_policy(xp, dir, c);
2692 case XFRM_MSG_FLUSHPOLICY:
2693 return xfrm_notify_policy_flush(c);
2694 case XFRM_MSG_POLEXPIRE:
2695 return xfrm_exp_policy_notify(xp, dir, c);
2696 default:
2697 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2698 c->event);
2699 }
2700
2701 return 0;
2702
2703 }
2704
2705 static inline size_t xfrm_report_msgsize(void)
2706 {
2707 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2708 }
2709
2710 static int build_report(struct sk_buff *skb, u8 proto,
2711 struct xfrm_selector *sel, xfrm_address_t *addr)
2712 {
2713 struct xfrm_user_report *ur;
2714 struct nlmsghdr *nlh;
2715
2716 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2717 if (nlh == NULL)
2718 return -EMSGSIZE;
2719
2720 ur = nlmsg_data(nlh);
2721 ur->proto = proto;
2722 memcpy(&ur->sel, sel, sizeof(ur->sel));
2723
2724 if (addr)
2725 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2726
2727 return nlmsg_end(skb, nlh);
2728
2729 nla_put_failure:
2730 nlmsg_cancel(skb, nlh);
2731 return -EMSGSIZE;
2732 }
2733
2734 static int xfrm_send_report(struct net *net, u8 proto,
2735 struct xfrm_selector *sel, xfrm_address_t *addr)
2736 {
2737 struct sk_buff *skb;
2738
2739 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2740 if (skb == NULL)
2741 return -ENOMEM;
2742
2743 if (build_report(skb, proto, sel, addr) < 0)
2744 BUG();
2745
2746 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2747 }
2748
2749 static inline size_t xfrm_mapping_msgsize(void)
2750 {
2751 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2752 }
2753
2754 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2755 xfrm_address_t *new_saddr, __be16 new_sport)
2756 {
2757 struct xfrm_user_mapping *um;
2758 struct nlmsghdr *nlh;
2759
2760 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2761 if (nlh == NULL)
2762 return -EMSGSIZE;
2763
2764 um = nlmsg_data(nlh);
2765
2766 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2767 um->id.spi = x->id.spi;
2768 um->id.family = x->props.family;
2769 um->id.proto = x->id.proto;
2770 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2771 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2772 um->new_sport = new_sport;
2773 um->old_sport = x->encap->encap_sport;
2774 um->reqid = x->props.reqid;
2775
2776 return nlmsg_end(skb, nlh);
2777 }
2778
2779 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2780 __be16 sport)
2781 {
2782 struct net *net = xs_net(x);
2783 struct sk_buff *skb;
2784
2785 if (x->id.proto != IPPROTO_ESP)
2786 return -EINVAL;
2787
2788 if (!x->encap)
2789 return -EINVAL;
2790
2791 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2792 if (skb == NULL)
2793 return -ENOMEM;
2794
2795 if (build_mapping(skb, x, ipaddr, sport) < 0)
2796 BUG();
2797
2798 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2799 }
2800
2801 static struct xfrm_mgr netlink_mgr = {
2802 .id = "netlink",
2803 .notify = xfrm_send_state_notify,
2804 .acquire = xfrm_send_acquire,
2805 .compile_policy = xfrm_compile_policy,
2806 .notify_policy = xfrm_send_policy_notify,
2807 .report = xfrm_send_report,
2808 .migrate = xfrm_send_migrate,
2809 .new_mapping = xfrm_send_mapping,
2810 };
2811
2812 static int __net_init xfrm_user_net_init(struct net *net)
2813 {
2814 struct sock *nlsk;
2815
2816 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
2817 xfrm_netlink_rcv, NULL, THIS_MODULE);
2818 if (nlsk == NULL)
2819 return -ENOMEM;
2820 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2821 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2822 return 0;
2823 }
2824
2825 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2826 {
2827 struct net *net;
2828 list_for_each_entry(net, net_exit_list, exit_list)
2829 rcu_assign_pointer(net->xfrm.nlsk, NULL);
2830 synchronize_net();
2831 list_for_each_entry(net, net_exit_list, exit_list)
2832 netlink_kernel_release(net->xfrm.nlsk_stash);
2833 }
2834
2835 static struct pernet_operations xfrm_user_net_ops = {
2836 .init = xfrm_user_net_init,
2837 .exit_batch = xfrm_user_net_exit,
2838 };
2839
2840 static int __init xfrm_user_init(void)
2841 {
2842 int rv;
2843
2844 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2845
2846 rv = register_pernet_subsys(&xfrm_user_net_ops);
2847 if (rv < 0)
2848 return rv;
2849 rv = xfrm_register_km(&netlink_mgr);
2850 if (rv < 0)
2851 unregister_pernet_subsys(&xfrm_user_net_ops);
2852 return rv;
2853 }
2854
2855 static void __exit xfrm_user_exit(void)
2856 {
2857 xfrm_unregister_km(&netlink_mgr);
2858 unregister_pernet_subsys(&xfrm_user_net_ops);
2859 }
2860
2861 module_init(xfrm_user_init);
2862 module_exit(xfrm_user_exit);
2863 MODULE_LICENSE("GPL");
2864 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2865
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree