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xfrm: SA lookups signature with mark
[pohmelfs.git] / net / xfrm / xfrm_user.c
blob331ae731080ab1bbd23d42606b3a371bbd0cf651
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 #define DUMMY_MARK 0
35 static struct xfrm_mark dummy_mark = {0, 0};
36
37 static inline int aead_len(struct xfrm_algo_aead *alg)
38 {
39 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
40 }
41
42 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
43 {
44 struct nlattr *rt = attrs[type];
45 struct xfrm_algo *algp;
46
47 if (!rt)
48 return 0;
49
50 algp = nla_data(rt);
51 if (nla_len(rt) < xfrm_alg_len(algp))
52 return -EINVAL;
53
54 switch (type) {
55 case XFRMA_ALG_AUTH:
56 case XFRMA_ALG_CRYPT:
57 case XFRMA_ALG_COMP:
58 break;
59
60 default:
61 return -EINVAL;
62 }
63
64 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
65 return 0;
66 }
67
68 static int verify_auth_trunc(struct nlattr **attrs)
69 {
70 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
71 struct xfrm_algo_auth *algp;
72
73 if (!rt)
74 return 0;
75
76 algp = nla_data(rt);
77 if (nla_len(rt) < xfrm_alg_auth_len(algp))
78 return -EINVAL;
79
80 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
81 return 0;
82 }
83
84 static int verify_aead(struct nlattr **attrs)
85 {
86 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
87 struct xfrm_algo_aead *algp;
88
89 if (!rt)
90 return 0;
91
92 algp = nla_data(rt);
93 if (nla_len(rt) < aead_len(algp))
94 return -EINVAL;
95
96 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
97 return 0;
98 }
99
100 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
101 xfrm_address_t **addrp)
102 {
103 struct nlattr *rt = attrs[type];
104
105 if (rt && addrp)
106 *addrp = nla_data(rt);
107 }
108
109 static inline int verify_sec_ctx_len(struct nlattr **attrs)
110 {
111 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
112 struct xfrm_user_sec_ctx *uctx;
113
114 if (!rt)
115 return 0;
116
117 uctx = nla_data(rt);
118 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
119 return -EINVAL;
120
121 return 0;
122 }
123
124
125 static int verify_newsa_info(struct xfrm_usersa_info *p,
126 struct nlattr **attrs)
127 {
128 int err;
129
130 err = -EINVAL;
131 switch (p->family) {
132 case AF_INET:
133 break;
134
135 case AF_INET6:
136 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
137 break;
138 #else
139 err = -EAFNOSUPPORT;
140 goto out;
141 #endif
142
143 default:
144 goto out;
145 }
146
147 err = -EINVAL;
148 switch (p->id.proto) {
149 case IPPROTO_AH:
150 if ((!attrs[XFRMA_ALG_AUTH] &&
151 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
152 attrs[XFRMA_ALG_AEAD] ||
153 attrs[XFRMA_ALG_CRYPT] ||
154 attrs[XFRMA_ALG_COMP])
155 goto out;
156 break;
157
158 case IPPROTO_ESP:
159 if (attrs[XFRMA_ALG_COMP])
160 goto out;
161 if (!attrs[XFRMA_ALG_AUTH] &&
162 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
163 !attrs[XFRMA_ALG_CRYPT] &&
164 !attrs[XFRMA_ALG_AEAD])
165 goto out;
166 if ((attrs[XFRMA_ALG_AUTH] ||
167 attrs[XFRMA_ALG_AUTH_TRUNC] ||
168 attrs[XFRMA_ALG_CRYPT]) &&
169 attrs[XFRMA_ALG_AEAD])
170 goto out;
171 break;
172
173 case IPPROTO_COMP:
174 if (!attrs[XFRMA_ALG_COMP] ||
175 attrs[XFRMA_ALG_AEAD] ||
176 attrs[XFRMA_ALG_AUTH] ||
177 attrs[XFRMA_ALG_AUTH_TRUNC] ||
178 attrs[XFRMA_ALG_CRYPT])
179 goto out;
180 break;
181
182 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
183 case IPPROTO_DSTOPTS:
184 case IPPROTO_ROUTING:
185 if (attrs[XFRMA_ALG_COMP] ||
186 attrs[XFRMA_ALG_AUTH] ||
187 attrs[XFRMA_ALG_AUTH_TRUNC] ||
188 attrs[XFRMA_ALG_AEAD] ||
189 attrs[XFRMA_ALG_CRYPT] ||
190 attrs[XFRMA_ENCAP] ||
191 attrs[XFRMA_SEC_CTX] ||
192 !attrs[XFRMA_COADDR])
193 goto out;
194 break;
195 #endif
196
197 default:
198 goto out;
199 }
200
201 if ((err = verify_aead(attrs)))
202 goto out;
203 if ((err = verify_auth_trunc(attrs)))
204 goto out;
205 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
206 goto out;
207 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
208 goto out;
209 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
210 goto out;
211 if ((err = verify_sec_ctx_len(attrs)))
212 goto out;
213
214 err = -EINVAL;
215 switch (p->mode) {
216 case XFRM_MODE_TRANSPORT:
217 case XFRM_MODE_TUNNEL:
218 case XFRM_MODE_ROUTEOPTIMIZATION:
219 case XFRM_MODE_BEET:
220 break;
221
222 default:
223 goto out;
224 }
225
226 err = 0;
227
228 out:
229 return err;
230 }
231
232 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
233 struct xfrm_algo_desc *(*get_byname)(char *, int),
234 struct nlattr *rta)
235 {
236 struct xfrm_algo *p, *ualg;
237 struct xfrm_algo_desc *algo;
238
239 if (!rta)
240 return 0;
241
242 ualg = nla_data(rta);
243
244 algo = get_byname(ualg->alg_name, 1);
245 if (!algo)
246 return -ENOSYS;
247 *props = algo->desc.sadb_alg_id;
248
249 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
250 if (!p)
251 return -ENOMEM;
252
253 strcpy(p->alg_name, algo->name);
254 *algpp = p;
255 return 0;
256 }
257
258 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
259 struct nlattr *rta)
260 {
261 struct xfrm_algo *ualg;
262 struct xfrm_algo_auth *p;
263 struct xfrm_algo_desc *algo;
264
265 if (!rta)
266 return 0;
267
268 ualg = nla_data(rta);
269
270 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
271 if (!algo)
272 return -ENOSYS;
273 *props = algo->desc.sadb_alg_id;
274
275 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
276 if (!p)
277 return -ENOMEM;
278
279 strcpy(p->alg_name, algo->name);
280 p->alg_key_len = ualg->alg_key_len;
281 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
282 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
283
284 *algpp = p;
285 return 0;
286 }
287
288 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
289 struct nlattr *rta)
290 {
291 struct xfrm_algo_auth *p, *ualg;
292 struct xfrm_algo_desc *algo;
293
294 if (!rta)
295 return 0;
296
297 ualg = nla_data(rta);
298
299 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
300 if (!algo)
301 return -ENOSYS;
302 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
303 return -EINVAL;
304 *props = algo->desc.sadb_alg_id;
305
306 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
307 if (!p)
308 return -ENOMEM;
309
310 strcpy(p->alg_name, algo->name);
311 if (!p->alg_trunc_len)
312 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
313
314 *algpp = p;
315 return 0;
316 }
317
318 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
319 struct nlattr *rta)
320 {
321 struct xfrm_algo_aead *p, *ualg;
322 struct xfrm_algo_desc *algo;
323
324 if (!rta)
325 return 0;
326
327 ualg = nla_data(rta);
328
329 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
330 if (!algo)
331 return -ENOSYS;
332 *props = algo->desc.sadb_alg_id;
333
334 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
335 if (!p)
336 return -ENOMEM;
337
338 strcpy(p->alg_name, algo->name);
339 *algpp = p;
340 return 0;
341 }
342
343 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
344 {
345 int len = 0;
346
347 if (xfrm_ctx) {
348 len += sizeof(struct xfrm_user_sec_ctx);
349 len += xfrm_ctx->ctx_len;
350 }
351 return len;
352 }
353
354 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
355 {
356 memcpy(&x->id, &p->id, sizeof(x->id));
357 memcpy(&x->sel, &p->sel, sizeof(x->sel));
358 memcpy(&x->lft, &p->lft, sizeof(x->lft));
359 x->props.mode = p->mode;
360 x->props.replay_window = p->replay_window;
361 x->props.reqid = p->reqid;
362 x->props.family = p->family;
363 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
364 x->props.flags = p->flags;
365
366 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
367 x->sel.family = p->family;
368 }
369
370 /*
371 * someday when pfkey also has support, we could have the code
372 * somehow made shareable and move it to xfrm_state.c - JHS
373 *
374 */
375 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
376 {
377 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
378 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
379 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
380 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
381
382 if (rp) {
383 struct xfrm_replay_state *replay;
384 replay = nla_data(rp);
385 memcpy(&x->replay, replay, sizeof(*replay));
386 memcpy(&x->preplay, replay, sizeof(*replay));
387 }
388
389 if (lt) {
390 struct xfrm_lifetime_cur *ltime;
391 ltime = nla_data(lt);
392 x->curlft.bytes = ltime->bytes;
393 x->curlft.packets = ltime->packets;
394 x->curlft.add_time = ltime->add_time;
395 x->curlft.use_time = ltime->use_time;
396 }
397
398 if (et)
399 x->replay_maxage = nla_get_u32(et);
400
401 if (rt)
402 x->replay_maxdiff = nla_get_u32(rt);
403 }
404
405 static struct xfrm_state *xfrm_state_construct(struct net *net,
406 struct xfrm_usersa_info *p,
407 struct nlattr **attrs,
408 int *errp)
409 {
410 struct xfrm_state *x = xfrm_state_alloc(net);
411 int err = -ENOMEM;
412
413 if (!x)
414 goto error_no_put;
415
416 copy_from_user_state(x, p);
417
418 if ((err = attach_aead(&x->aead, &x->props.ealgo,
419 attrs[XFRMA_ALG_AEAD])))
420 goto error;
421 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
422 attrs[XFRMA_ALG_AUTH_TRUNC])))
423 goto error;
424 if (!x->props.aalgo) {
425 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
426 attrs[XFRMA_ALG_AUTH])))
427 goto error;
428 }
429 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
430 xfrm_ealg_get_byname,
431 attrs[XFRMA_ALG_CRYPT])))
432 goto error;
433 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
434 xfrm_calg_get_byname,
435 attrs[XFRMA_ALG_COMP])))
436 goto error;
437
438 if (attrs[XFRMA_ENCAP]) {
439 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
440 sizeof(*x->encap), GFP_KERNEL);
441 if (x->encap == NULL)
442 goto error;
443 }
444
445 if (attrs[XFRMA_COADDR]) {
446 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
447 sizeof(*x->coaddr), GFP_KERNEL);
448 if (x->coaddr == NULL)
449 goto error;
450 }
451
452 err = xfrm_init_state(x);
453 if (err)
454 goto error;
455
456 if (attrs[XFRMA_SEC_CTX] &&
457 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
458 goto error;
459
460 x->km.seq = p->seq;
461 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
462 /* sysctl_xfrm_aevent_etime is in 100ms units */
463 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
464 x->preplay.bitmap = 0;
465 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
466 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
467
468 /* override default values from above */
469
470 xfrm_update_ae_params(x, attrs);
471
472 return x;
473
474 error:
475 x->km.state = XFRM_STATE_DEAD;
476 xfrm_state_put(x);
477 error_no_put:
478 *errp = err;
479 return NULL;
480 }
481
482 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
483 struct nlattr **attrs)
484 {
485 struct net *net = sock_net(skb->sk);
486 struct xfrm_usersa_info *p = nlmsg_data(nlh);
487 struct xfrm_state *x;
488 int err;
489 struct km_event c;
490 uid_t loginuid = NETLINK_CB(skb).loginuid;
491 u32 sessionid = NETLINK_CB(skb).sessionid;
492 u32 sid = NETLINK_CB(skb).sid;
493
494 err = verify_newsa_info(p, attrs);
495 if (err)
496 return err;
497
498 x = xfrm_state_construct(net, p, attrs, &err);
499 if (!x)
500 return err;
501
502 xfrm_state_hold(x);
503 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
504 err = xfrm_state_add(x);
505 else
506 err = xfrm_state_update(x);
507
508 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
509
510 if (err < 0) {
511 x->km.state = XFRM_STATE_DEAD;
512 __xfrm_state_put(x);
513 goto out;
514 }
515
516 c.seq = nlh->nlmsg_seq;
517 c.pid = nlh->nlmsg_pid;
518 c.event = nlh->nlmsg_type;
519
520 km_state_notify(x, &c);
521 out:
522 xfrm_state_put(x);
523 return err;
524 }
525
526 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
527 struct xfrm_usersa_id *p,
528 struct nlattr **attrs,
529 int *errp)
530 {
531 struct xfrm_state *x = NULL;
532 int err;
533
534 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
535 err = -ESRCH;
536 x = xfrm_state_lookup(net, DUMMY_MARK, &p->daddr, p->spi, p->proto, p->family);
537 } else {
538 xfrm_address_t *saddr = NULL;
539
540 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
541 if (!saddr) {
542 err = -EINVAL;
543 goto out;
544 }
545
546 err = -ESRCH;
547 x = xfrm_state_lookup_byaddr(net, DUMMY_MARK, &p->daddr, saddr,
548 p->proto, p->family);
549 }
550
551 out:
552 if (!x && errp)
553 *errp = err;
554 return x;
555 }
556
557 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
558 struct nlattr **attrs)
559 {
560 struct net *net = sock_net(skb->sk);
561 struct xfrm_state *x;
562 int err = -ESRCH;
563 struct km_event c;
564 struct xfrm_usersa_id *p = nlmsg_data(nlh);
565 uid_t loginuid = NETLINK_CB(skb).loginuid;
566 u32 sessionid = NETLINK_CB(skb).sessionid;
567 u32 sid = NETLINK_CB(skb).sid;
568
569 x = xfrm_user_state_lookup(net, p, attrs, &err);
570 if (x == NULL)
571 return err;
572
573 if ((err = security_xfrm_state_delete(x)) != 0)
574 goto out;
575
576 if (xfrm_state_kern(x)) {
577 err = -EPERM;
578 goto out;
579 }
580
581 err = xfrm_state_delete(x);
582
583 if (err < 0)
584 goto out;
585
586 c.seq = nlh->nlmsg_seq;
587 c.pid = nlh->nlmsg_pid;
588 c.event = nlh->nlmsg_type;
589 km_state_notify(x, &c);
590
591 out:
592 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
593 xfrm_state_put(x);
594 return err;
595 }
596
597 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
598 {
599 memcpy(&p->id, &x->id, sizeof(p->id));
600 memcpy(&p->sel, &x->sel, sizeof(p->sel));
601 memcpy(&p->lft, &x->lft, sizeof(p->lft));
602 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
603 memcpy(&p->stats, &x->stats, sizeof(p->stats));
604 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
605 p->mode = x->props.mode;
606 p->replay_window = x->props.replay_window;
607 p->reqid = x->props.reqid;
608 p->family = x->props.family;
609 p->flags = x->props.flags;
610 p->seq = x->km.seq;
611 }
612
613 struct xfrm_dump_info {
614 struct sk_buff *in_skb;
615 struct sk_buff *out_skb;
616 u32 nlmsg_seq;
617 u16 nlmsg_flags;
618 };
619
620 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
621 {
622 struct xfrm_user_sec_ctx *uctx;
623 struct nlattr *attr;
624 int ctx_size = sizeof(*uctx) + s->ctx_len;
625
626 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
627 if (attr == NULL)
628 return -EMSGSIZE;
629
630 uctx = nla_data(attr);
631 uctx->exttype = XFRMA_SEC_CTX;
632 uctx->len = ctx_size;
633 uctx->ctx_doi = s->ctx_doi;
634 uctx->ctx_alg = s->ctx_alg;
635 uctx->ctx_len = s->ctx_len;
636 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
637
638 return 0;
639 }
640
641 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
642 {
643 struct xfrm_algo *algo;
644 struct nlattr *nla;
645
646 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
647 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
648 if (!nla)
649 return -EMSGSIZE;
650
651 algo = nla_data(nla);
652 strcpy(algo->alg_name, auth->alg_name);
653 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
654 algo->alg_key_len = auth->alg_key_len;
655
656 return 0;
657 }
658
659 /* Don't change this without updating xfrm_sa_len! */
660 static int copy_to_user_state_extra(struct xfrm_state *x,
661 struct xfrm_usersa_info *p,
662 struct sk_buff *skb)
663 {
664 copy_to_user_state(x, p);
665
666 if (x->coaddr)
667 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
668
669 if (x->lastused)
670 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
671
672 if (x->aead)
673 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
674 if (x->aalg) {
675 if (copy_to_user_auth(x->aalg, skb))
676 goto nla_put_failure;
677
678 NLA_PUT(skb, XFRMA_ALG_AUTH_TRUNC,
679 xfrm_alg_auth_len(x->aalg), x->aalg);
680 }
681 if (x->ealg)
682 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
683 if (x->calg)
684 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
685
686 if (x->encap)
687 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
688
689 if (x->security && copy_sec_ctx(x->security, skb) < 0)
690 goto nla_put_failure;
691
692 return 0;
693
694 nla_put_failure:
695 return -EMSGSIZE;
696 }
697
698 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
699 {
700 struct xfrm_dump_info *sp = ptr;
701 struct sk_buff *in_skb = sp->in_skb;
702 struct sk_buff *skb = sp->out_skb;
703 struct xfrm_usersa_info *p;
704 struct nlmsghdr *nlh;
705 int err;
706
707 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
708 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
709 if (nlh == NULL)
710 return -EMSGSIZE;
711
712 p = nlmsg_data(nlh);
713
714 err = copy_to_user_state_extra(x, p, skb);
715 if (err)
716 goto nla_put_failure;
717
718 nlmsg_end(skb, nlh);
719 return 0;
720
721 nla_put_failure:
722 nlmsg_cancel(skb, nlh);
723 return err;
724 }
725
726 static int xfrm_dump_sa_done(struct netlink_callback *cb)
727 {
728 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
729 xfrm_state_walk_done(walk);
730 return 0;
731 }
732
733 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
734 {
735 struct net *net = sock_net(skb->sk);
736 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
737 struct xfrm_dump_info info;
738
739 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
740 sizeof(cb->args) - sizeof(cb->args[0]));
741
742 info.in_skb = cb->skb;
743 info.out_skb = skb;
744 info.nlmsg_seq = cb->nlh->nlmsg_seq;
745 info.nlmsg_flags = NLM_F_MULTI;
746
747 if (!cb->args[0]) {
748 cb->args[0] = 1;
749 xfrm_state_walk_init(walk, 0);
750 }
751
752 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
753
754 return skb->len;
755 }
756
757 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
758 struct xfrm_state *x, u32 seq)
759 {
760 struct xfrm_dump_info info;
761 struct sk_buff *skb;
762
763 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
764 if (!skb)
765 return ERR_PTR(-ENOMEM);
766
767 info.in_skb = in_skb;
768 info.out_skb = skb;
769 info.nlmsg_seq = seq;
770 info.nlmsg_flags = 0;
771
772 if (dump_one_state(x, 0, &info)) {
773 kfree_skb(skb);
774 return NULL;
775 }
776
777 return skb;
778 }
779
780 static inline size_t xfrm_spdinfo_msgsize(void)
781 {
782 return NLMSG_ALIGN(4)
783 + nla_total_size(sizeof(struct xfrmu_spdinfo))
784 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
785 }
786
787 static int build_spdinfo(struct sk_buff *skb, struct net *net,
788 u32 pid, u32 seq, u32 flags)
789 {
790 struct xfrmk_spdinfo si;
791 struct xfrmu_spdinfo spc;
792 struct xfrmu_spdhinfo sph;
793 struct nlmsghdr *nlh;
794 u32 *f;
795
796 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
797 if (nlh == NULL) /* shouldnt really happen ... */
798 return -EMSGSIZE;
799
800 f = nlmsg_data(nlh);
801 *f = flags;
802 xfrm_spd_getinfo(net, &si);
803 spc.incnt = si.incnt;
804 spc.outcnt = si.outcnt;
805 spc.fwdcnt = si.fwdcnt;
806 spc.inscnt = si.inscnt;
807 spc.outscnt = si.outscnt;
808 spc.fwdscnt = si.fwdscnt;
809 sph.spdhcnt = si.spdhcnt;
810 sph.spdhmcnt = si.spdhmcnt;
811
812 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
813 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
814
815 return nlmsg_end(skb, nlh);
816
817 nla_put_failure:
818 nlmsg_cancel(skb, nlh);
819 return -EMSGSIZE;
820 }
821
822 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
823 struct nlattr **attrs)
824 {
825 struct net *net = sock_net(skb->sk);
826 struct sk_buff *r_skb;
827 u32 *flags = nlmsg_data(nlh);
828 u32 spid = NETLINK_CB(skb).pid;
829 u32 seq = nlh->nlmsg_seq;
830
831 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
832 if (r_skb == NULL)
833 return -ENOMEM;
834
835 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
836 BUG();
837
838 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
839 }
840
841 static inline size_t xfrm_sadinfo_msgsize(void)
842 {
843 return NLMSG_ALIGN(4)
844 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
845 + nla_total_size(4); /* XFRMA_SAD_CNT */
846 }
847
848 static int build_sadinfo(struct sk_buff *skb, struct net *net,
849 u32 pid, u32 seq, u32 flags)
850 {
851 struct xfrmk_sadinfo si;
852 struct xfrmu_sadhinfo sh;
853 struct nlmsghdr *nlh;
854 u32 *f;
855
856 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
857 if (nlh == NULL) /* shouldnt really happen ... */
858 return -EMSGSIZE;
859
860 f = nlmsg_data(nlh);
861 *f = flags;
862 xfrm_sad_getinfo(net, &si);
863
864 sh.sadhmcnt = si.sadhmcnt;
865 sh.sadhcnt = si.sadhcnt;
866
867 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
868 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
869
870 return nlmsg_end(skb, nlh);
871
872 nla_put_failure:
873 nlmsg_cancel(skb, nlh);
874 return -EMSGSIZE;
875 }
876
877 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
878 struct nlattr **attrs)
879 {
880 struct net *net = sock_net(skb->sk);
881 struct sk_buff *r_skb;
882 u32 *flags = nlmsg_data(nlh);
883 u32 spid = NETLINK_CB(skb).pid;
884 u32 seq = nlh->nlmsg_seq;
885
886 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
887 if (r_skb == NULL)
888 return -ENOMEM;
889
890 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
891 BUG();
892
893 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
894 }
895
896 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
897 struct nlattr **attrs)
898 {
899 struct net *net = sock_net(skb->sk);
900 struct xfrm_usersa_id *p = nlmsg_data(nlh);
901 struct xfrm_state *x;
902 struct sk_buff *resp_skb;
903 int err = -ESRCH;
904
905 x = xfrm_user_state_lookup(net, p, attrs, &err);
906 if (x == NULL)
907 goto out_noput;
908
909 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
910 if (IS_ERR(resp_skb)) {
911 err = PTR_ERR(resp_skb);
912 } else {
913 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
914 }
915 xfrm_state_put(x);
916 out_noput:
917 return err;
918 }
919
920 static int verify_userspi_info(struct xfrm_userspi_info *p)
921 {
922 switch (p->info.id.proto) {
923 case IPPROTO_AH:
924 case IPPROTO_ESP:
925 break;
926
927 case IPPROTO_COMP:
928 /* IPCOMP spi is 16-bits. */
929 if (p->max >= 0x10000)
930 return -EINVAL;
931 break;
932
933 default:
934 return -EINVAL;
935 }
936
937 if (p->min > p->max)
938 return -EINVAL;
939
940 return 0;
941 }
942
943 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
944 struct nlattr **attrs)
945 {
946 struct net *net = sock_net(skb->sk);
947 struct xfrm_state *x;
948 struct xfrm_userspi_info *p;
949 struct sk_buff *resp_skb;
950 xfrm_address_t *daddr;
951 int family;
952 int err;
953
954 p = nlmsg_data(nlh);
955 err = verify_userspi_info(p);
956 if (err)
957 goto out_noput;
958
959 family = p->info.family;
960 daddr = &p->info.id.daddr;
961
962 x = NULL;
963 if (p->info.seq) {
964 x = xfrm_find_acq_byseq(net, DUMMY_MARK, p->info.seq);
965 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
966 xfrm_state_put(x);
967 x = NULL;
968 }
969 }
970
971 if (!x)
972 x = xfrm_find_acq(net, &dummy_mark, p->info.mode, p->info.reqid,
973 p->info.id.proto, daddr,
974 &p->info.saddr, 1,
975 family);
976 err = -ENOENT;
977 if (x == NULL)
978 goto out_noput;
979
980 err = xfrm_alloc_spi(x, p->min, p->max);
981 if (err)
982 goto out;
983
984 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
985 if (IS_ERR(resp_skb)) {
986 err = PTR_ERR(resp_skb);
987 goto out;
988 }
989
990 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
991
992 out:
993 xfrm_state_put(x);
994 out_noput:
995 return err;
996 }
997
998 static int verify_policy_dir(u8 dir)
999 {
1000 switch (dir) {
1001 case XFRM_POLICY_IN:
1002 case XFRM_POLICY_OUT:
1003 case XFRM_POLICY_FWD:
1004 break;
1005
1006 default:
1007 return -EINVAL;
1008 }
1009
1010 return 0;
1011 }
1012
1013 static int verify_policy_type(u8 type)
1014 {
1015 switch (type) {
1016 case XFRM_POLICY_TYPE_MAIN:
1017 #ifdef CONFIG_XFRM_SUB_POLICY
1018 case XFRM_POLICY_TYPE_SUB:
1019 #endif
1020 break;
1021
1022 default:
1023 return -EINVAL;
1024 }
1025
1026 return 0;
1027 }
1028
1029 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1030 {
1031 switch (p->share) {
1032 case XFRM_SHARE_ANY:
1033 case XFRM_SHARE_SESSION:
1034 case XFRM_SHARE_USER:
1035 case XFRM_SHARE_UNIQUE:
1036 break;
1037
1038 default:
1039 return -EINVAL;
1040 }
1041
1042 switch (p->action) {
1043 case XFRM_POLICY_ALLOW:
1044 case XFRM_POLICY_BLOCK:
1045 break;
1046
1047 default:
1048 return -EINVAL;
1049 }
1050
1051 switch (p->sel.family) {
1052 case AF_INET:
1053 break;
1054
1055 case AF_INET6:
1056 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1057 break;
1058 #else
1059 return -EAFNOSUPPORT;
1060 #endif
1061
1062 default:
1063 return -EINVAL;
1064 }
1065
1066 return verify_policy_dir(p->dir);
1067 }
1068
1069 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1070 {
1071 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1072 struct xfrm_user_sec_ctx *uctx;
1073
1074 if (!rt)
1075 return 0;
1076
1077 uctx = nla_data(rt);
1078 return security_xfrm_policy_alloc(&pol->security, uctx);
1079 }
1080
1081 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1082 int nr)
1083 {
1084 int i;
1085
1086 xp->xfrm_nr = nr;
1087 for (i = 0; i < nr; i++, ut++) {
1088 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1089
1090 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1091 memcpy(&t->saddr, &ut->saddr,
1092 sizeof(xfrm_address_t));
1093 t->reqid = ut->reqid;
1094 t->mode = ut->mode;
1095 t->share = ut->share;
1096 t->optional = ut->optional;
1097 t->aalgos = ut->aalgos;
1098 t->ealgos = ut->ealgos;
1099 t->calgos = ut->calgos;
1100 /* If all masks are ~0, then we allow all algorithms. */
1101 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1102 t->encap_family = ut->family;
1103 }
1104 }
1105
1106 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1107 {
1108 int i;
1109
1110 if (nr > XFRM_MAX_DEPTH)
1111 return -EINVAL;
1112
1113 for (i = 0; i < nr; i++) {
1114 /* We never validated the ut->family value, so many
1115 * applications simply leave it at zero. The check was
1116 * never made and ut->family was ignored because all
1117 * templates could be assumed to have the same family as
1118 * the policy itself. Now that we will have ipv4-in-ipv6
1119 * and ipv6-in-ipv4 tunnels, this is no longer true.
1120 */
1121 if (!ut[i].family)
1122 ut[i].family = family;
1123
1124 switch (ut[i].family) {
1125 case AF_INET:
1126 break;
1127 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1128 case AF_INET6:
1129 break;
1130 #endif
1131 default:
1132 return -EINVAL;
1133 }
1134 }
1135
1136 return 0;
1137 }
1138
1139 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1140 {
1141 struct nlattr *rt = attrs[XFRMA_TMPL];
1142
1143 if (!rt) {
1144 pol->xfrm_nr = 0;
1145 } else {
1146 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1147 int nr = nla_len(rt) / sizeof(*utmpl);
1148 int err;
1149
1150 err = validate_tmpl(nr, utmpl, pol->family);
1151 if (err)
1152 return err;
1153
1154 copy_templates(pol, utmpl, nr);
1155 }
1156 return 0;
1157 }
1158
1159 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1160 {
1161 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1162 struct xfrm_userpolicy_type *upt;
1163 u8 type = XFRM_POLICY_TYPE_MAIN;
1164 int err;
1165
1166 if (rt) {
1167 upt = nla_data(rt);
1168 type = upt->type;
1169 }
1170
1171 err = verify_policy_type(type);
1172 if (err)
1173 return err;
1174
1175 *tp = type;
1176 return 0;
1177 }
1178
1179 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1180 {
1181 xp->priority = p->priority;
1182 xp->index = p->index;
1183 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1184 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1185 xp->action = p->action;
1186 xp->flags = p->flags;
1187 xp->family = p->sel.family;
1188 /* XXX xp->share = p->share; */
1189 }
1190
1191 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1192 {
1193 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1194 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1195 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1196 p->priority = xp->priority;
1197 p->index = xp->index;
1198 p->sel.family = xp->family;
1199 p->dir = dir;
1200 p->action = xp->action;
1201 p->flags = xp->flags;
1202 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1203 }
1204
1205 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1206 {
1207 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1208 int err;
1209
1210 if (!xp) {
1211 *errp = -ENOMEM;
1212 return NULL;
1213 }
1214
1215 copy_from_user_policy(xp, p);
1216
1217 err = copy_from_user_policy_type(&xp->type, attrs);
1218 if (err)
1219 goto error;
1220
1221 if (!(err = copy_from_user_tmpl(xp, attrs)))
1222 err = copy_from_user_sec_ctx(xp, attrs);
1223 if (err)
1224 goto error;
1225
1226 return xp;
1227 error:
1228 *errp = err;
1229 xp->walk.dead = 1;
1230 xfrm_policy_destroy(xp);
1231 return NULL;
1232 }
1233
1234 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1235 struct nlattr **attrs)
1236 {
1237 struct net *net = sock_net(skb->sk);
1238 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1239 struct xfrm_policy *xp;
1240 struct km_event c;
1241 int err;
1242 int excl;
1243 uid_t loginuid = NETLINK_CB(skb).loginuid;
1244 u32 sessionid = NETLINK_CB(skb).sessionid;
1245 u32 sid = NETLINK_CB(skb).sid;
1246
1247 err = verify_newpolicy_info(p);
1248 if (err)
1249 return err;
1250 err = verify_sec_ctx_len(attrs);
1251 if (err)
1252 return err;
1253
1254 xp = xfrm_policy_construct(net, p, attrs, &err);
1255 if (!xp)
1256 return err;
1257
1258 /* shouldnt excl be based on nlh flags??
1259 * Aha! this is anti-netlink really i.e more pfkey derived
1260 * in netlink excl is a flag and you wouldnt need
1261 * a type XFRM_MSG_UPDPOLICY - JHS */
1262 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1263 err = xfrm_policy_insert(p->dir, xp, excl);
1264 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1265
1266 if (err) {
1267 security_xfrm_policy_free(xp->security);
1268 kfree(xp);
1269 return err;
1270 }
1271
1272 c.event = nlh->nlmsg_type;
1273 c.seq = nlh->nlmsg_seq;
1274 c.pid = nlh->nlmsg_pid;
1275 km_policy_notify(xp, p->dir, &c);
1276
1277 xfrm_pol_put(xp);
1278
1279 return 0;
1280 }
1281
1282 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1283 {
1284 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1285 int i;
1286
1287 if (xp->xfrm_nr == 0)
1288 return 0;
1289
1290 for (i = 0; i < xp->xfrm_nr; i++) {
1291 struct xfrm_user_tmpl *up = &vec[i];
1292 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1293
1294 memcpy(&up->id, &kp->id, sizeof(up->id));
1295 up->family = kp->encap_family;
1296 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1297 up->reqid = kp->reqid;
1298 up->mode = kp->mode;
1299 up->share = kp->share;
1300 up->optional = kp->optional;
1301 up->aalgos = kp->aalgos;
1302 up->ealgos = kp->ealgos;
1303 up->calgos = kp->calgos;
1304 }
1305
1306 return nla_put(skb, XFRMA_TMPL,
1307 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1308 }
1309
1310 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1311 {
1312 if (x->security) {
1313 return copy_sec_ctx(x->security, skb);
1314 }
1315 return 0;
1316 }
1317
1318 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1319 {
1320 if (xp->security) {
1321 return copy_sec_ctx(xp->security, skb);
1322 }
1323 return 0;
1324 }
1325 static inline size_t userpolicy_type_attrsize(void)
1326 {
1327 #ifdef CONFIG_XFRM_SUB_POLICY
1328 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1329 #else
1330 return 0;
1331 #endif
1332 }
1333
1334 #ifdef CONFIG_XFRM_SUB_POLICY
1335 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1336 {
1337 struct xfrm_userpolicy_type upt = {
1338 .type = type,
1339 };
1340
1341 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1342 }
1343
1344 #else
1345 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1346 {
1347 return 0;
1348 }
1349 #endif
1350
1351 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1352 {
1353 struct xfrm_dump_info *sp = ptr;
1354 struct xfrm_userpolicy_info *p;
1355 struct sk_buff *in_skb = sp->in_skb;
1356 struct sk_buff *skb = sp->out_skb;
1357 struct nlmsghdr *nlh;
1358
1359 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1360 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1361 if (nlh == NULL)
1362 return -EMSGSIZE;
1363
1364 p = nlmsg_data(nlh);
1365 copy_to_user_policy(xp, p, dir);
1366 if (copy_to_user_tmpl(xp, skb) < 0)
1367 goto nlmsg_failure;
1368 if (copy_to_user_sec_ctx(xp, skb))
1369 goto nlmsg_failure;
1370 if (copy_to_user_policy_type(xp->type, skb) < 0)
1371 goto nlmsg_failure;
1372
1373 nlmsg_end(skb, nlh);
1374 return 0;
1375
1376 nlmsg_failure:
1377 nlmsg_cancel(skb, nlh);
1378 return -EMSGSIZE;
1379 }
1380
1381 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1382 {
1383 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1384
1385 xfrm_policy_walk_done(walk);
1386 return 0;
1387 }
1388
1389 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1390 {
1391 struct net *net = sock_net(skb->sk);
1392 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1393 struct xfrm_dump_info info;
1394
1395 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1396 sizeof(cb->args) - sizeof(cb->args[0]));
1397
1398 info.in_skb = cb->skb;
1399 info.out_skb = skb;
1400 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1401 info.nlmsg_flags = NLM_F_MULTI;
1402
1403 if (!cb->args[0]) {
1404 cb->args[0] = 1;
1405 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1406 }
1407
1408 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1409
1410 return skb->len;
1411 }
1412
1413 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1414 struct xfrm_policy *xp,
1415 int dir, u32 seq)
1416 {
1417 struct xfrm_dump_info info;
1418 struct sk_buff *skb;
1419
1420 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1421 if (!skb)
1422 return ERR_PTR(-ENOMEM);
1423
1424 info.in_skb = in_skb;
1425 info.out_skb = skb;
1426 info.nlmsg_seq = seq;
1427 info.nlmsg_flags = 0;
1428
1429 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1430 kfree_skb(skb);
1431 return NULL;
1432 }
1433
1434 return skb;
1435 }
1436
1437 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1438 struct nlattr **attrs)
1439 {
1440 struct net *net = sock_net(skb->sk);
1441 struct xfrm_policy *xp;
1442 struct xfrm_userpolicy_id *p;
1443 u8 type = XFRM_POLICY_TYPE_MAIN;
1444 int err;
1445 struct km_event c;
1446 int delete;
1447
1448 p = nlmsg_data(nlh);
1449 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1450
1451 err = copy_from_user_policy_type(&type, attrs);
1452 if (err)
1453 return err;
1454
1455 err = verify_policy_dir(p->dir);
1456 if (err)
1457 return err;
1458
1459 if (p->index)
1460 xp = xfrm_policy_byid(net, type, p->dir, p->index, delete, &err);
1461 else {
1462 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1463 struct xfrm_sec_ctx *ctx;
1464
1465 err = verify_sec_ctx_len(attrs);
1466 if (err)
1467 return err;
1468
1469 ctx = NULL;
1470 if (rt) {
1471 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1472
1473 err = security_xfrm_policy_alloc(&ctx, uctx);
1474 if (err)
1475 return err;
1476 }
1477 xp = xfrm_policy_bysel_ctx(net, type, p->dir, &p->sel, ctx,
1478 delete, &err);
1479 security_xfrm_policy_free(ctx);
1480 }
1481 if (xp == NULL)
1482 return -ENOENT;
1483
1484 if (!delete) {
1485 struct sk_buff *resp_skb;
1486
1487 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1488 if (IS_ERR(resp_skb)) {
1489 err = PTR_ERR(resp_skb);
1490 } else {
1491 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1492 NETLINK_CB(skb).pid);
1493 }
1494 } else {
1495 uid_t loginuid = NETLINK_CB(skb).loginuid;
1496 u32 sessionid = NETLINK_CB(skb).sessionid;
1497 u32 sid = NETLINK_CB(skb).sid;
1498
1499 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1500 sid);
1501
1502 if (err != 0)
1503 goto out;
1504
1505 c.data.byid = p->index;
1506 c.event = nlh->nlmsg_type;
1507 c.seq = nlh->nlmsg_seq;
1508 c.pid = nlh->nlmsg_pid;
1509 km_policy_notify(xp, p->dir, &c);
1510 }
1511
1512 out:
1513 xfrm_pol_put(xp);
1514 return err;
1515 }
1516
1517 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1518 struct nlattr **attrs)
1519 {
1520 struct net *net = sock_net(skb->sk);
1521 struct km_event c;
1522 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1523 struct xfrm_audit audit_info;
1524 int err;
1525
1526 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1527 audit_info.sessionid = NETLINK_CB(skb).sessionid;
1528 audit_info.secid = NETLINK_CB(skb).sid;
1529 err = xfrm_state_flush(net, p->proto, &audit_info);
1530 if (err) {
1531 if (err == -ESRCH) /* empty table */
1532 return 0;
1533 return err;
1534 }
1535 c.data.proto = p->proto;
1536 c.event = nlh->nlmsg_type;
1537 c.seq = nlh->nlmsg_seq;
1538 c.pid = nlh->nlmsg_pid;
1539 c.net = net;
1540 km_state_notify(NULL, &c);
1541
1542 return 0;
1543 }
1544
1545 static inline size_t xfrm_aevent_msgsize(void)
1546 {
1547 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1548 + nla_total_size(sizeof(struct xfrm_replay_state))
1549 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1550 + nla_total_size(4) /* XFRM_AE_RTHR */
1551 + nla_total_size(4); /* XFRM_AE_ETHR */
1552 }
1553
1554 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1555 {
1556 struct xfrm_aevent_id *id;
1557 struct nlmsghdr *nlh;
1558
1559 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1560 if (nlh == NULL)
1561 return -EMSGSIZE;
1562
1563 id = nlmsg_data(nlh);
1564 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1565 id->sa_id.spi = x->id.spi;
1566 id->sa_id.family = x->props.family;
1567 id->sa_id.proto = x->id.proto;
1568 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1569 id->reqid = x->props.reqid;
1570 id->flags = c->data.aevent;
1571
1572 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1573 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1574
1575 if (id->flags & XFRM_AE_RTHR)
1576 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1577
1578 if (id->flags & XFRM_AE_ETHR)
1579 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1580 x->replay_maxage * 10 / HZ);
1581
1582 return nlmsg_end(skb, nlh);
1583
1584 nla_put_failure:
1585 nlmsg_cancel(skb, nlh);
1586 return -EMSGSIZE;
1587 }
1588
1589 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1590 struct nlattr **attrs)
1591 {
1592 struct net *net = sock_net(skb->sk);
1593 struct xfrm_state *x;
1594 struct sk_buff *r_skb;
1595 int err;
1596 struct km_event c;
1597 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1598 struct xfrm_usersa_id *id = &p->sa_id;
1599
1600 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1601 if (r_skb == NULL)
1602 return -ENOMEM;
1603
1604 x = xfrm_state_lookup(net, DUMMY_MARK, &id->daddr, id->spi, id->proto, id->family);
1605 if (x == NULL) {
1606 kfree_skb(r_skb);
1607 return -ESRCH;
1608 }
1609
1610 /*
1611 * XXX: is this lock really needed - none of the other
1612 * gets lock (the concern is things getting updated
1613 * while we are still reading) - jhs
1614 */
1615 spin_lock_bh(&x->lock);
1616 c.data.aevent = p->flags;
1617 c.seq = nlh->nlmsg_seq;
1618 c.pid = nlh->nlmsg_pid;
1619
1620 if (build_aevent(r_skb, x, &c) < 0)
1621 BUG();
1622 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
1623 spin_unlock_bh(&x->lock);
1624 xfrm_state_put(x);
1625 return err;
1626 }
1627
1628 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1629 struct nlattr **attrs)
1630 {
1631 struct net *net = sock_net(skb->sk);
1632 struct xfrm_state *x;
1633 struct km_event c;
1634 int err = - EINVAL;
1635 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1636 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1637 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1638
1639 if (!lt && !rp)
1640 return err;
1641
1642 /* pedantic mode - thou shalt sayeth replaceth */
1643 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1644 return err;
1645
1646 x = xfrm_state_lookup(net, DUMMY_MARK, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1647 if (x == NULL)
1648 return -ESRCH;
1649
1650 if (x->km.state != XFRM_STATE_VALID)
1651 goto out;
1652
1653 spin_lock_bh(&x->lock);
1654 xfrm_update_ae_params(x, attrs);
1655 spin_unlock_bh(&x->lock);
1656
1657 c.event = nlh->nlmsg_type;
1658 c.seq = nlh->nlmsg_seq;
1659 c.pid = nlh->nlmsg_pid;
1660 c.data.aevent = XFRM_AE_CU;
1661 km_state_notify(x, &c);
1662 err = 0;
1663 out:
1664 xfrm_state_put(x);
1665 return err;
1666 }
1667
1668 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1669 struct nlattr **attrs)
1670 {
1671 struct net *net = sock_net(skb->sk);
1672 struct km_event c;
1673 u8 type = XFRM_POLICY_TYPE_MAIN;
1674 int err;
1675 struct xfrm_audit audit_info;
1676
1677 err = copy_from_user_policy_type(&type, attrs);
1678 if (err)
1679 return err;
1680
1681 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1682 audit_info.sessionid = NETLINK_CB(skb).sessionid;
1683 audit_info.secid = NETLINK_CB(skb).sid;
1684 err = xfrm_policy_flush(net, type, &audit_info);
1685 if (err) {
1686 if (err == -ESRCH) /* empty table */
1687 return 0;
1688 return err;
1689 }
1690
1691 c.data.type = type;
1692 c.event = nlh->nlmsg_type;
1693 c.seq = nlh->nlmsg_seq;
1694 c.pid = nlh->nlmsg_pid;
1695 c.net = net;
1696 km_policy_notify(NULL, 0, &c);
1697 return 0;
1698 }
1699
1700 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1701 struct nlattr **attrs)
1702 {
1703 struct net *net = sock_net(skb->sk);
1704 struct xfrm_policy *xp;
1705 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1706 struct xfrm_userpolicy_info *p = &up->pol;
1707 u8 type = XFRM_POLICY_TYPE_MAIN;
1708 int err = -ENOENT;
1709
1710 err = copy_from_user_policy_type(&type, attrs);
1711 if (err)
1712 return err;
1713
1714 if (p->index)
1715 xp = xfrm_policy_byid(net, type, p->dir, p->index, 0, &err);
1716 else {
1717 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1718 struct xfrm_sec_ctx *ctx;
1719
1720 err = verify_sec_ctx_len(attrs);
1721 if (err)
1722 return err;
1723
1724 ctx = NULL;
1725 if (rt) {
1726 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1727
1728 err = security_xfrm_policy_alloc(&ctx, uctx);
1729 if (err)
1730 return err;
1731 }
1732 xp = xfrm_policy_bysel_ctx(net, type, p->dir, &p->sel, ctx, 0, &err);
1733 security_xfrm_policy_free(ctx);
1734 }
1735 if (xp == NULL)
1736 return -ENOENT;
1737
1738 read_lock(&xp->lock);
1739 if (xp->walk.dead) {
1740 read_unlock(&xp->lock);
1741 goto out;
1742 }
1743
1744 read_unlock(&xp->lock);
1745 err = 0;
1746 if (up->hard) {
1747 uid_t loginuid = NETLINK_CB(skb).loginuid;
1748 uid_t sessionid = NETLINK_CB(skb).sessionid;
1749 u32 sid = NETLINK_CB(skb).sid;
1750 xfrm_policy_delete(xp, p->dir);
1751 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1752
1753 } else {
1754 // reset the timers here?
1755 printk("Dont know what to do with soft policy expire\n");
1756 }
1757 km_policy_expired(xp, p->dir, up->hard, current->pid);
1758
1759 out:
1760 xfrm_pol_put(xp);
1761 return err;
1762 }
1763
1764 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1765 struct nlattr **attrs)
1766 {
1767 struct net *net = sock_net(skb->sk);
1768 struct xfrm_state *x;
1769 int err;
1770 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1771 struct xfrm_usersa_info *p = &ue->state;
1772
1773 x = xfrm_state_lookup(net, DUMMY_MARK, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1774
1775 err = -ENOENT;
1776 if (x == NULL)
1777 return err;
1778
1779 spin_lock_bh(&x->lock);
1780 err = -EINVAL;
1781 if (x->km.state != XFRM_STATE_VALID)
1782 goto out;
1783 km_state_expired(x, ue->hard, current->pid);
1784
1785 if (ue->hard) {
1786 uid_t loginuid = NETLINK_CB(skb).loginuid;
1787 uid_t sessionid = NETLINK_CB(skb).sessionid;
1788 u32 sid = NETLINK_CB(skb).sid;
1789 __xfrm_state_delete(x);
1790 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1791 }
1792 err = 0;
1793 out:
1794 spin_unlock_bh(&x->lock);
1795 xfrm_state_put(x);
1796 return err;
1797 }
1798
1799 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1800 struct nlattr **attrs)
1801 {
1802 struct net *net = sock_net(skb->sk);
1803 struct xfrm_policy *xp;
1804 struct xfrm_user_tmpl *ut;
1805 int i;
1806 struct nlattr *rt = attrs[XFRMA_TMPL];
1807
1808 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1809 struct xfrm_state *x = xfrm_state_alloc(net);
1810 int err = -ENOMEM;
1811
1812 if (!x)
1813 goto nomem;
1814
1815 err = verify_newpolicy_info(&ua->policy);
1816 if (err)
1817 goto bad_policy;
1818
1819 /* build an XP */
1820 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
1821 if (!xp)
1822 goto free_state;
1823
1824 memcpy(&x->id, &ua->id, sizeof(ua->id));
1825 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1826 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1827
1828 ut = nla_data(rt);
1829 /* extract the templates and for each call km_key */
1830 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1831 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1832 memcpy(&x->id, &t->id, sizeof(x->id));
1833 x->props.mode = t->mode;
1834 x->props.reqid = t->reqid;
1835 x->props.family = ut->family;
1836 t->aalgos = ua->aalgos;
1837 t->ealgos = ua->ealgos;
1838 t->calgos = ua->calgos;
1839 err = km_query(x, t, xp);
1840
1841 }
1842
1843 kfree(x);
1844 kfree(xp);
1845
1846 return 0;
1847
1848 bad_policy:
1849 printk("BAD policy passed\n");
1850 free_state:
1851 kfree(x);
1852 nomem:
1853 return err;
1854 }
1855
1856 #ifdef CONFIG_XFRM_MIGRATE
1857 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1858 struct xfrm_kmaddress *k,
1859 struct nlattr **attrs, int *num)
1860 {
1861 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1862 struct xfrm_user_migrate *um;
1863 int i, num_migrate;
1864
1865 if (k != NULL) {
1866 struct xfrm_user_kmaddress *uk;
1867
1868 uk = nla_data(attrs[XFRMA_KMADDRESS]);
1869 memcpy(&k->local, &uk->local, sizeof(k->local));
1870 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
1871 k->family = uk->family;
1872 k->reserved = uk->reserved;
1873 }
1874
1875 um = nla_data(rt);
1876 num_migrate = nla_len(rt) / sizeof(*um);
1877
1878 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1879 return -EINVAL;
1880
1881 for (i = 0; i < num_migrate; i++, um++, ma++) {
1882 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1883 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1884 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1885 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1886
1887 ma->proto = um->proto;
1888 ma->mode = um->mode;
1889 ma->reqid = um->reqid;
1890
1891 ma->old_family = um->old_family;
1892 ma->new_family = um->new_family;
1893 }
1894
1895 *num = i;
1896 return 0;
1897 }
1898
1899 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1900 struct nlattr **attrs)
1901 {
1902 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1903 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1904 struct xfrm_kmaddress km, *kmp;
1905 u8 type;
1906 int err;
1907 int n = 0;
1908
1909 if (attrs[XFRMA_MIGRATE] == NULL)
1910 return -EINVAL;
1911
1912 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
1913
1914 err = copy_from_user_policy_type(&type, attrs);
1915 if (err)
1916 return err;
1917
1918 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
1919 if (err)
1920 return err;
1921
1922 if (!n)
1923 return 0;
1924
1925 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
1926
1927 return 0;
1928 }
1929 #else
1930 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1931 struct nlattr **attrs)
1932 {
1933 return -ENOPROTOOPT;
1934 }
1935 #endif
1936
1937 #ifdef CONFIG_XFRM_MIGRATE
1938 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1939 {
1940 struct xfrm_user_migrate um;
1941
1942 memset(&um, 0, sizeof(um));
1943 um.proto = m->proto;
1944 um.mode = m->mode;
1945 um.reqid = m->reqid;
1946 um.old_family = m->old_family;
1947 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1948 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1949 um.new_family = m->new_family;
1950 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1951 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1952
1953 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1954 }
1955
1956 static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
1957 {
1958 struct xfrm_user_kmaddress uk;
1959
1960 memset(&uk, 0, sizeof(uk));
1961 uk.family = k->family;
1962 uk.reserved = k->reserved;
1963 memcpy(&uk.local, &k->local, sizeof(uk.local));
1964 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
1965
1966 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
1967 }
1968
1969 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
1970 {
1971 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1972 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
1973 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1974 + userpolicy_type_attrsize();
1975 }
1976
1977 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1978 int num_migrate, struct xfrm_kmaddress *k,
1979 struct xfrm_selector *sel, u8 dir, u8 type)
1980 {
1981 struct xfrm_migrate *mp;
1982 struct xfrm_userpolicy_id *pol_id;
1983 struct nlmsghdr *nlh;
1984 int i;
1985
1986 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1987 if (nlh == NULL)
1988 return -EMSGSIZE;
1989
1990 pol_id = nlmsg_data(nlh);
1991 /* copy data from selector, dir, and type to the pol_id */
1992 memset(pol_id, 0, sizeof(*pol_id));
1993 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1994 pol_id->dir = dir;
1995
1996 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
1997 goto nlmsg_failure;
1998
1999 if (copy_to_user_policy_type(type, skb) < 0)
2000 goto nlmsg_failure;
2001
2002 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2003 if (copy_to_user_migrate(mp, skb) < 0)
2004 goto nlmsg_failure;
2005 }
2006
2007 return nlmsg_end(skb, nlh);
2008 nlmsg_failure:
2009 nlmsg_cancel(skb, nlh);
2010 return -EMSGSIZE;
2011 }
2012
2013 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2014 struct xfrm_migrate *m, int num_migrate,
2015 struct xfrm_kmaddress *k)
2016 {
2017 struct net *net = &init_net;
2018 struct sk_buff *skb;
2019
2020 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2021 if (skb == NULL)
2022 return -ENOMEM;
2023
2024 /* build migrate */
2025 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2026 BUG();
2027
2028 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2029 }
2030 #else
2031 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2032 struct xfrm_migrate *m, int num_migrate,
2033 struct xfrm_kmaddress *k)
2034 {
2035 return -ENOPROTOOPT;
2036 }
2037 #endif
2038
2039 #define XMSGSIZE(type) sizeof(struct type)
2040
2041 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2042 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2043 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2044 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2045 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2046 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2047 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2048 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2049 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2050 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2051 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2052 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2053 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2054 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2055 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2056 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2057 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2058 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2059 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2060 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2061 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2062 };
2063
2064 #undef XMSGSIZE
2065
2066 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2067 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2068 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2069 [XFRMA_LASTUSED] = { .type = NLA_U64},
2070 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2071 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2072 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2073 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2074 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2075 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2076 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2077 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2078 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2079 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2080 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2081 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2082 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2083 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2084 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2085 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2086 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2087 };
2088
2089 static struct xfrm_link {
2090 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2091 int (*dump)(struct sk_buff *, struct netlink_callback *);
2092 int (*done)(struct netlink_callback *);
2093 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2094 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2095 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2096 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2097 .dump = xfrm_dump_sa,
2098 .done = xfrm_dump_sa_done },
2099 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2100 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2101 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2102 .dump = xfrm_dump_policy,
2103 .done = xfrm_dump_policy_done },
2104 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2105 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2106 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2107 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2108 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2109 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2110 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2111 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2112 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2113 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2114 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2115 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2116 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2117 };
2118
2119 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2120 {
2121 struct net *net = sock_net(skb->sk);
2122 struct nlattr *attrs[XFRMA_MAX+1];
2123 struct xfrm_link *link;
2124 int type, err;
2125
2126 type = nlh->nlmsg_type;
2127 if (type > XFRM_MSG_MAX)
2128 return -EINVAL;
2129
2130 type -= XFRM_MSG_BASE;
2131 link = &xfrm_dispatch[type];
2132
2133 /* All operations require privileges, even GET */
2134 if (security_netlink_recv(skb, CAP_NET_ADMIN))
2135 return -EPERM;
2136
2137 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2138 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2139 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2140 if (link->dump == NULL)
2141 return -EINVAL;
2142
2143 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done);
2144 }
2145
2146 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2147 xfrma_policy);
2148 if (err < 0)
2149 return err;
2150
2151 if (link->doit == NULL)
2152 return -EINVAL;
2153
2154 return link->doit(skb, nlh, attrs);
2155 }
2156
2157 static void xfrm_netlink_rcv(struct sk_buff *skb)
2158 {
2159 mutex_lock(&xfrm_cfg_mutex);
2160 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2161 mutex_unlock(&xfrm_cfg_mutex);
2162 }
2163
2164 static inline size_t xfrm_expire_msgsize(void)
2165 {
2166 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
2167 }
2168
2169 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
2170 {
2171 struct xfrm_user_expire *ue;
2172 struct nlmsghdr *nlh;
2173
2174 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2175 if (nlh == NULL)
2176 return -EMSGSIZE;
2177
2178 ue = nlmsg_data(nlh);
2179 copy_to_user_state(x, &ue->state);
2180 ue->hard = (c->data.hard != 0) ? 1 : 0;
2181
2182 return nlmsg_end(skb, nlh);
2183 }
2184
2185 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
2186 {
2187 struct net *net = xs_net(x);
2188 struct sk_buff *skb;
2189
2190 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2191 if (skb == NULL)
2192 return -ENOMEM;
2193
2194 if (build_expire(skb, x, c) < 0)
2195 BUG();
2196
2197 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2198 }
2199
2200 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2201 {
2202 struct net *net = xs_net(x);
2203 struct sk_buff *skb;
2204
2205 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2206 if (skb == NULL)
2207 return -ENOMEM;
2208
2209 if (build_aevent(skb, x, c) < 0)
2210 BUG();
2211
2212 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2213 }
2214
2215 static int xfrm_notify_sa_flush(struct km_event *c)
2216 {
2217 struct net *net = c->net;
2218 struct xfrm_usersa_flush *p;
2219 struct nlmsghdr *nlh;
2220 struct sk_buff *skb;
2221 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2222
2223 skb = nlmsg_new(len, GFP_ATOMIC);
2224 if (skb == NULL)
2225 return -ENOMEM;
2226
2227 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2228 if (nlh == NULL) {
2229 kfree_skb(skb);
2230 return -EMSGSIZE;
2231 }
2232
2233 p = nlmsg_data(nlh);
2234 p->proto = c->data.proto;
2235
2236 nlmsg_end(skb, nlh);
2237
2238 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2239 }
2240
2241 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2242 {
2243 size_t l = 0;
2244 if (x->aead)
2245 l += nla_total_size(aead_len(x->aead));
2246 if (x->aalg) {
2247 l += nla_total_size(sizeof(struct xfrm_algo) +
2248 (x->aalg->alg_key_len + 7) / 8);
2249 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2250 }
2251 if (x->ealg)
2252 l += nla_total_size(xfrm_alg_len(x->ealg));
2253 if (x->calg)
2254 l += nla_total_size(sizeof(*x->calg));
2255 if (x->encap)
2256 l += nla_total_size(sizeof(*x->encap));
2257 if (x->security)
2258 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2259 x->security->ctx_len);
2260 if (x->coaddr)
2261 l += nla_total_size(sizeof(*x->coaddr));
2262
2263 /* Must count x->lastused as it may become non-zero behind our back. */
2264 l += nla_total_size(sizeof(u64));
2265
2266 return l;
2267 }
2268
2269 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2270 {
2271 struct net *net = xs_net(x);
2272 struct xfrm_usersa_info *p;
2273 struct xfrm_usersa_id *id;
2274 struct nlmsghdr *nlh;
2275 struct sk_buff *skb;
2276 int len = xfrm_sa_len(x);
2277 int headlen;
2278
2279 headlen = sizeof(*p);
2280 if (c->event == XFRM_MSG_DELSA) {
2281 len += nla_total_size(headlen);
2282 headlen = sizeof(*id);
2283 }
2284 len += NLMSG_ALIGN(headlen);
2285
2286 skb = nlmsg_new(len, GFP_ATOMIC);
2287 if (skb == NULL)
2288 return -ENOMEM;
2289
2290 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2291 if (nlh == NULL)
2292 goto nla_put_failure;
2293
2294 p = nlmsg_data(nlh);
2295 if (c->event == XFRM_MSG_DELSA) {
2296 struct nlattr *attr;
2297
2298 id = nlmsg_data(nlh);
2299 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2300 id->spi = x->id.spi;
2301 id->family = x->props.family;
2302 id->proto = x->id.proto;
2303
2304 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2305 if (attr == NULL)
2306 goto nla_put_failure;
2307
2308 p = nla_data(attr);
2309 }
2310
2311 if (copy_to_user_state_extra(x, p, skb))
2312 goto nla_put_failure;
2313
2314 nlmsg_end(skb, nlh);
2315
2316 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2317
2318 nla_put_failure:
2319 /* Somebody screwed up with xfrm_sa_len! */
2320 WARN_ON(1);
2321 kfree_skb(skb);
2322 return -1;
2323 }
2324
2325 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2326 {
2327
2328 switch (c->event) {
2329 case XFRM_MSG_EXPIRE:
2330 return xfrm_exp_state_notify(x, c);
2331 case XFRM_MSG_NEWAE:
2332 return xfrm_aevent_state_notify(x, c);
2333 case XFRM_MSG_DELSA:
2334 case XFRM_MSG_UPDSA:
2335 case XFRM_MSG_NEWSA:
2336 return xfrm_notify_sa(x, c);
2337 case XFRM_MSG_FLUSHSA:
2338 return xfrm_notify_sa_flush(c);
2339 default:
2340 printk("xfrm_user: Unknown SA event %d\n", c->event);
2341 break;
2342 }
2343
2344 return 0;
2345
2346 }
2347
2348 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2349 struct xfrm_policy *xp)
2350 {
2351 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2352 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2353 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2354 + userpolicy_type_attrsize();
2355 }
2356
2357 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2358 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2359 int dir)
2360 {
2361 struct xfrm_user_acquire *ua;
2362 struct nlmsghdr *nlh;
2363 __u32 seq = xfrm_get_acqseq();
2364
2365 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2366 if (nlh == NULL)
2367 return -EMSGSIZE;
2368
2369 ua = nlmsg_data(nlh);
2370 memcpy(&ua->id, &x->id, sizeof(ua->id));
2371 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2372 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2373 copy_to_user_policy(xp, &ua->policy, dir);
2374 ua->aalgos = xt->aalgos;
2375 ua->ealgos = xt->ealgos;
2376 ua->calgos = xt->calgos;
2377 ua->seq = x->km.seq = seq;
2378
2379 if (copy_to_user_tmpl(xp, skb) < 0)
2380 goto nlmsg_failure;
2381 if (copy_to_user_state_sec_ctx(x, skb))
2382 goto nlmsg_failure;
2383 if (copy_to_user_policy_type(xp->type, skb) < 0)
2384 goto nlmsg_failure;
2385
2386 return nlmsg_end(skb, nlh);
2387
2388 nlmsg_failure:
2389 nlmsg_cancel(skb, nlh);
2390 return -EMSGSIZE;
2391 }
2392
2393 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2394 struct xfrm_policy *xp, int dir)
2395 {
2396 struct net *net = xs_net(x);
2397 struct sk_buff *skb;
2398
2399 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2400 if (skb == NULL)
2401 return -ENOMEM;
2402
2403 if (build_acquire(skb, x, xt, xp, dir) < 0)
2404 BUG();
2405
2406 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2407 }
2408
2409 /* User gives us xfrm_user_policy_info followed by an array of 0
2410 * or more templates.
2411 */
2412 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2413 u8 *data, int len, int *dir)
2414 {
2415 struct net *net = sock_net(sk);
2416 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2417 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2418 struct xfrm_policy *xp;
2419 int nr;
2420
2421 switch (sk->sk_family) {
2422 case AF_INET:
2423 if (opt != IP_XFRM_POLICY) {
2424 *dir = -EOPNOTSUPP;
2425 return NULL;
2426 }
2427 break;
2428 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2429 case AF_INET6:
2430 if (opt != IPV6_XFRM_POLICY) {
2431 *dir = -EOPNOTSUPP;
2432 return NULL;
2433 }
2434 break;
2435 #endif
2436 default:
2437 *dir = -EINVAL;
2438 return NULL;
2439 }
2440
2441 *dir = -EINVAL;
2442
2443 if (len < sizeof(*p) ||
2444 verify_newpolicy_info(p))
2445 return NULL;
2446
2447 nr = ((len - sizeof(*p)) / sizeof(*ut));
2448 if (validate_tmpl(nr, ut, p->sel.family))
2449 return NULL;
2450
2451 if (p->dir > XFRM_POLICY_OUT)
2452 return NULL;
2453
2454 xp = xfrm_policy_alloc(net, GFP_KERNEL);
2455 if (xp == NULL) {
2456 *dir = -ENOBUFS;
2457 return NULL;
2458 }
2459
2460 copy_from_user_policy(xp, p);
2461 xp->type = XFRM_POLICY_TYPE_MAIN;
2462 copy_templates(xp, ut, nr);
2463
2464 *dir = p->dir;
2465
2466 return xp;
2467 }
2468
2469 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2470 {
2471 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2472 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2473 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2474 + userpolicy_type_attrsize();
2475 }
2476
2477 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2478 int dir, struct km_event *c)
2479 {
2480 struct xfrm_user_polexpire *upe;
2481 struct nlmsghdr *nlh;
2482 int hard = c->data.hard;
2483
2484 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2485 if (nlh == NULL)
2486 return -EMSGSIZE;
2487
2488 upe = nlmsg_data(nlh);
2489 copy_to_user_policy(xp, &upe->pol, dir);
2490 if (copy_to_user_tmpl(xp, skb) < 0)
2491 goto nlmsg_failure;
2492 if (copy_to_user_sec_ctx(xp, skb))
2493 goto nlmsg_failure;
2494 if (copy_to_user_policy_type(xp->type, skb) < 0)
2495 goto nlmsg_failure;
2496 upe->hard = !!hard;
2497
2498 return nlmsg_end(skb, nlh);
2499
2500 nlmsg_failure:
2501 nlmsg_cancel(skb, nlh);
2502 return -EMSGSIZE;
2503 }
2504
2505 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2506 {
2507 struct net *net = xp_net(xp);
2508 struct sk_buff *skb;
2509
2510 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2511 if (skb == NULL)
2512 return -ENOMEM;
2513
2514 if (build_polexpire(skb, xp, dir, c) < 0)
2515 BUG();
2516
2517 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2518 }
2519
2520 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2521 {
2522 struct net *net = xp_net(xp);
2523 struct xfrm_userpolicy_info *p;
2524 struct xfrm_userpolicy_id *id;
2525 struct nlmsghdr *nlh;
2526 struct sk_buff *skb;
2527 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2528 int headlen;
2529
2530 headlen = sizeof(*p);
2531 if (c->event == XFRM_MSG_DELPOLICY) {
2532 len += nla_total_size(headlen);
2533 headlen = sizeof(*id);
2534 }
2535 len += userpolicy_type_attrsize();
2536 len += NLMSG_ALIGN(headlen);
2537
2538 skb = nlmsg_new(len, GFP_ATOMIC);
2539 if (skb == NULL)
2540 return -ENOMEM;
2541
2542 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2543 if (nlh == NULL)
2544 goto nlmsg_failure;
2545
2546 p = nlmsg_data(nlh);
2547 if (c->event == XFRM_MSG_DELPOLICY) {
2548 struct nlattr *attr;
2549
2550 id = nlmsg_data(nlh);
2551 memset(id, 0, sizeof(*id));
2552 id->dir = dir;
2553 if (c->data.byid)
2554 id->index = xp->index;
2555 else
2556 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2557
2558 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2559 if (attr == NULL)
2560 goto nlmsg_failure;
2561
2562 p = nla_data(attr);
2563 }
2564
2565 copy_to_user_policy(xp, p, dir);
2566 if (copy_to_user_tmpl(xp, skb) < 0)
2567 goto nlmsg_failure;
2568 if (copy_to_user_policy_type(xp->type, skb) < 0)
2569 goto nlmsg_failure;
2570
2571 nlmsg_end(skb, nlh);
2572
2573 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2574
2575 nlmsg_failure:
2576 kfree_skb(skb);
2577 return -1;
2578 }
2579
2580 static int xfrm_notify_policy_flush(struct km_event *c)
2581 {
2582 struct net *net = c->net;
2583 struct nlmsghdr *nlh;
2584 struct sk_buff *skb;
2585
2586 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2587 if (skb == NULL)
2588 return -ENOMEM;
2589
2590 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2591 if (nlh == NULL)
2592 goto nlmsg_failure;
2593 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2594 goto nlmsg_failure;
2595
2596 nlmsg_end(skb, nlh);
2597
2598 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2599
2600 nlmsg_failure:
2601 kfree_skb(skb);
2602 return -1;
2603 }
2604
2605 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2606 {
2607
2608 switch (c->event) {
2609 case XFRM_MSG_NEWPOLICY:
2610 case XFRM_MSG_UPDPOLICY:
2611 case XFRM_MSG_DELPOLICY:
2612 return xfrm_notify_policy(xp, dir, c);
2613 case XFRM_MSG_FLUSHPOLICY:
2614 return xfrm_notify_policy_flush(c);
2615 case XFRM_MSG_POLEXPIRE:
2616 return xfrm_exp_policy_notify(xp, dir, c);
2617 default:
2618 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2619 }
2620
2621 return 0;
2622
2623 }
2624
2625 static inline size_t xfrm_report_msgsize(void)
2626 {
2627 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2628 }
2629
2630 static int build_report(struct sk_buff *skb, u8 proto,
2631 struct xfrm_selector *sel, xfrm_address_t *addr)
2632 {
2633 struct xfrm_user_report *ur;
2634 struct nlmsghdr *nlh;
2635
2636 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2637 if (nlh == NULL)
2638 return -EMSGSIZE;
2639
2640 ur = nlmsg_data(nlh);
2641 ur->proto = proto;
2642 memcpy(&ur->sel, sel, sizeof(ur->sel));
2643
2644 if (addr)
2645 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2646
2647 return nlmsg_end(skb, nlh);
2648
2649 nla_put_failure:
2650 nlmsg_cancel(skb, nlh);
2651 return -EMSGSIZE;
2652 }
2653
2654 static int xfrm_send_report(struct net *net, u8 proto,
2655 struct xfrm_selector *sel, xfrm_address_t *addr)
2656 {
2657 struct sk_buff *skb;
2658
2659 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2660 if (skb == NULL)
2661 return -ENOMEM;
2662
2663 if (build_report(skb, proto, sel, addr) < 0)
2664 BUG();
2665
2666 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2667 }
2668
2669 static inline size_t xfrm_mapping_msgsize(void)
2670 {
2671 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2672 }
2673
2674 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2675 xfrm_address_t *new_saddr, __be16 new_sport)
2676 {
2677 struct xfrm_user_mapping *um;
2678 struct nlmsghdr *nlh;
2679
2680 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2681 if (nlh == NULL)
2682 return -EMSGSIZE;
2683
2684 um = nlmsg_data(nlh);
2685
2686 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2687 um->id.spi = x->id.spi;
2688 um->id.family = x->props.family;
2689 um->id.proto = x->id.proto;
2690 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2691 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2692 um->new_sport = new_sport;
2693 um->old_sport = x->encap->encap_sport;
2694 um->reqid = x->props.reqid;
2695
2696 return nlmsg_end(skb, nlh);
2697 }
2698
2699 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2700 __be16 sport)
2701 {
2702 struct net *net = xs_net(x);
2703 struct sk_buff *skb;
2704
2705 if (x->id.proto != IPPROTO_ESP)
2706 return -EINVAL;
2707
2708 if (!x->encap)
2709 return -EINVAL;
2710
2711 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2712 if (skb == NULL)
2713 return -ENOMEM;
2714
2715 if (build_mapping(skb, x, ipaddr, sport) < 0)
2716 BUG();
2717
2718 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2719 }
2720
2721 static struct xfrm_mgr netlink_mgr = {
2722 .id = "netlink",
2723 .notify = xfrm_send_state_notify,
2724 .acquire = xfrm_send_acquire,
2725 .compile_policy = xfrm_compile_policy,
2726 .notify_policy = xfrm_send_policy_notify,
2727 .report = xfrm_send_report,
2728 .migrate = xfrm_send_migrate,
2729 .new_mapping = xfrm_send_mapping,
2730 };
2731
2732 static int __net_init xfrm_user_net_init(struct net *net)
2733 {
2734 struct sock *nlsk;
2735
2736 nlsk = netlink_kernel_create(net, NETLINK_XFRM, XFRMNLGRP_MAX,
2737 xfrm_netlink_rcv, NULL, THIS_MODULE);
2738 if (nlsk == NULL)
2739 return -ENOMEM;
2740 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2741 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2742 return 0;
2743 }
2744
2745 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2746 {
2747 struct net *net;
2748 list_for_each_entry(net, net_exit_list, exit_list)
2749 rcu_assign_pointer(net->xfrm.nlsk, NULL);
2750 synchronize_net();
2751 list_for_each_entry(net, net_exit_list, exit_list)
2752 netlink_kernel_release(net->xfrm.nlsk_stash);
2753 }
2754
2755 static struct pernet_operations xfrm_user_net_ops = {
2756 .init = xfrm_user_net_init,
2757 .exit_batch = xfrm_user_net_exit,
2758 };
2759
2760 static int __init xfrm_user_init(void)
2761 {
2762 int rv;
2763
2764 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2765
2766 rv = register_pernet_subsys(&xfrm_user_net_ops);
2767 if (rv < 0)
2768 return rv;
2769 rv = xfrm_register_km(&netlink_mgr);
2770 if (rv < 0)
2771 unregister_pernet_subsys(&xfrm_user_net_ops);
2772 return rv;
2773 }
2774
2775 static void __exit xfrm_user_exit(void)
2776 {
2777 xfrm_unregister_km(&netlink_mgr);
2778 unregister_pernet_subsys(&xfrm_user_net_ops);
2779 }
2780
2781 module_init(xfrm_user_init);
2782 module_exit(xfrm_user_exit);
2783 MODULE_LICENSE("GPL");
2784 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2785