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[ALSA] soc - duplicate strcasecmp test for "rj-master" in mpc8610_hpcd_probe()
[linux-2.6/openmoko-kernel/knife-kernel.git] / net / xfrm / xfrm_user.c
blobf971ca5645f8283991f29e06fe2bdc888b66a499
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <asm/uaccess.h>
30 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
31 #include <linux/in6.h>
32 #endif
33
34 static inline int aead_len(struct xfrm_algo_aead *alg)
35 {
36 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
37 }
38
39 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
40 {
41 struct nlattr *rt = attrs[type];
42 struct xfrm_algo *algp;
43
44 if (!rt)
45 return 0;
46
47 algp = nla_data(rt);
48 if (nla_len(rt) < xfrm_alg_len(algp))
49 return -EINVAL;
50
51 switch (type) {
52 case XFRMA_ALG_AUTH:
53 if (!algp->alg_key_len &&
54 strcmp(algp->alg_name, "digest_null") != 0)
55 return -EINVAL;
56 break;
57
58 case XFRMA_ALG_CRYPT:
59 if (!algp->alg_key_len &&
60 strcmp(algp->alg_name, "cipher_null") != 0)
61 return -EINVAL;
62 break;
63
64 case XFRMA_ALG_COMP:
65 /* Zero length keys are legal. */
66 break;
67
68 default:
69 return -EINVAL;
70 }
71
72 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
73 return 0;
74 }
75
76 static int verify_aead(struct nlattr **attrs)
77 {
78 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
79 struct xfrm_algo_aead *algp;
80
81 if (!rt)
82 return 0;
83
84 algp = nla_data(rt);
85 if (nla_len(rt) < aead_len(algp))
86 return -EINVAL;
87
88 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
89 return 0;
90 }
91
92 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
93 xfrm_address_t **addrp)
94 {
95 struct nlattr *rt = attrs[type];
96
97 if (rt && addrp)
98 *addrp = nla_data(rt);
99 }
100
101 static inline int verify_sec_ctx_len(struct nlattr **attrs)
102 {
103 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
104 struct xfrm_user_sec_ctx *uctx;
105
106 if (!rt)
107 return 0;
108
109 uctx = nla_data(rt);
110 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
111 return -EINVAL;
112
113 return 0;
114 }
115
116
117 static int verify_newsa_info(struct xfrm_usersa_info *p,
118 struct nlattr **attrs)
119 {
120 int err;
121
122 err = -EINVAL;
123 switch (p->family) {
124 case AF_INET:
125 break;
126
127 case AF_INET6:
128 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
129 break;
130 #else
131 err = -EAFNOSUPPORT;
132 goto out;
133 #endif
134
135 default:
136 goto out;
137 }
138
139 err = -EINVAL;
140 switch (p->id.proto) {
141 case IPPROTO_AH:
142 if (!attrs[XFRMA_ALG_AUTH] ||
143 attrs[XFRMA_ALG_AEAD] ||
144 attrs[XFRMA_ALG_CRYPT] ||
145 attrs[XFRMA_ALG_COMP])
146 goto out;
147 break;
148
149 case IPPROTO_ESP:
150 if (attrs[XFRMA_ALG_COMP])
151 goto out;
152 if (!attrs[XFRMA_ALG_AUTH] &&
153 !attrs[XFRMA_ALG_CRYPT] &&
154 !attrs[XFRMA_ALG_AEAD])
155 goto out;
156 if ((attrs[XFRMA_ALG_AUTH] ||
157 attrs[XFRMA_ALG_CRYPT]) &&
158 attrs[XFRMA_ALG_AEAD])
159 goto out;
160 break;
161
162 case IPPROTO_COMP:
163 if (!attrs[XFRMA_ALG_COMP] ||
164 attrs[XFRMA_ALG_AEAD] ||
165 attrs[XFRMA_ALG_AUTH] ||
166 attrs[XFRMA_ALG_CRYPT])
167 goto out;
168 break;
169
170 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
171 case IPPROTO_DSTOPTS:
172 case IPPROTO_ROUTING:
173 if (attrs[XFRMA_ALG_COMP] ||
174 attrs[XFRMA_ALG_AUTH] ||
175 attrs[XFRMA_ALG_AEAD] ||
176 attrs[XFRMA_ALG_CRYPT] ||
177 attrs[XFRMA_ENCAP] ||
178 attrs[XFRMA_SEC_CTX] ||
179 !attrs[XFRMA_COADDR])
180 goto out;
181 break;
182 #endif
183
184 default:
185 goto out;
186 }
187
188 if ((err = verify_aead(attrs)))
189 goto out;
190 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
191 goto out;
192 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
193 goto out;
194 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
195 goto out;
196 if ((err = verify_sec_ctx_len(attrs)))
197 goto out;
198
199 err = -EINVAL;
200 switch (p->mode) {
201 case XFRM_MODE_TRANSPORT:
202 case XFRM_MODE_TUNNEL:
203 case XFRM_MODE_ROUTEOPTIMIZATION:
204 case XFRM_MODE_BEET:
205 break;
206
207 default:
208 goto out;
209 }
210
211 err = 0;
212
213 out:
214 return err;
215 }
216
217 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
218 struct xfrm_algo_desc *(*get_byname)(char *, int),
219 struct nlattr *rta)
220 {
221 struct xfrm_algo *p, *ualg;
222 struct xfrm_algo_desc *algo;
223
224 if (!rta)
225 return 0;
226
227 ualg = nla_data(rta);
228
229 algo = get_byname(ualg->alg_name, 1);
230 if (!algo)
231 return -ENOSYS;
232 *props = algo->desc.sadb_alg_id;
233
234 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
235 if (!p)
236 return -ENOMEM;
237
238 strcpy(p->alg_name, algo->name);
239 *algpp = p;
240 return 0;
241 }
242
243 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
244 struct nlattr *rta)
245 {
246 struct xfrm_algo_aead *p, *ualg;
247 struct xfrm_algo_desc *algo;
248
249 if (!rta)
250 return 0;
251
252 ualg = nla_data(rta);
253
254 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
255 if (!algo)
256 return -ENOSYS;
257 *props = algo->desc.sadb_alg_id;
258
259 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
260 if (!p)
261 return -ENOMEM;
262
263 strcpy(p->alg_name, algo->name);
264 *algpp = p;
265 return 0;
266 }
267
268 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
269 {
270 int len = 0;
271
272 if (xfrm_ctx) {
273 len += sizeof(struct xfrm_user_sec_ctx);
274 len += xfrm_ctx->ctx_len;
275 }
276 return len;
277 }
278
279 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
280 {
281 memcpy(&x->id, &p->id, sizeof(x->id));
282 memcpy(&x->sel, &p->sel, sizeof(x->sel));
283 memcpy(&x->lft, &p->lft, sizeof(x->lft));
284 x->props.mode = p->mode;
285 x->props.replay_window = p->replay_window;
286 x->props.reqid = p->reqid;
287 x->props.family = p->family;
288 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
289 x->props.flags = p->flags;
290
291 /*
292 * Set inner address family if the KM left it as zero.
293 * See comment in validate_tmpl.
294 */
295 if (!x->sel.family)
296 x->sel.family = p->family;
297 }
298
299 /*
300 * someday when pfkey also has support, we could have the code
301 * somehow made shareable and move it to xfrm_state.c - JHS
302 *
303 */
304 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
305 {
306 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
307 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
308 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
309 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
310
311 if (rp) {
312 struct xfrm_replay_state *replay;
313 replay = nla_data(rp);
314 memcpy(&x->replay, replay, sizeof(*replay));
315 memcpy(&x->preplay, replay, sizeof(*replay));
316 }
317
318 if (lt) {
319 struct xfrm_lifetime_cur *ltime;
320 ltime = nla_data(lt);
321 x->curlft.bytes = ltime->bytes;
322 x->curlft.packets = ltime->packets;
323 x->curlft.add_time = ltime->add_time;
324 x->curlft.use_time = ltime->use_time;
325 }
326
327 if (et)
328 x->replay_maxage = nla_get_u32(et);
329
330 if (rt)
331 x->replay_maxdiff = nla_get_u32(rt);
332 }
333
334 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
335 struct nlattr **attrs,
336 int *errp)
337 {
338 struct xfrm_state *x = xfrm_state_alloc();
339 int err = -ENOMEM;
340
341 if (!x)
342 goto error_no_put;
343
344 copy_from_user_state(x, p);
345
346 if ((err = attach_aead(&x->aead, &x->props.ealgo,
347 attrs[XFRMA_ALG_AEAD])))
348 goto error;
349 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
350 xfrm_aalg_get_byname,
351 attrs[XFRMA_ALG_AUTH])))
352 goto error;
353 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
354 xfrm_ealg_get_byname,
355 attrs[XFRMA_ALG_CRYPT])))
356 goto error;
357 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
358 xfrm_calg_get_byname,
359 attrs[XFRMA_ALG_COMP])))
360 goto error;
361
362 if (attrs[XFRMA_ENCAP]) {
363 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
364 sizeof(*x->encap), GFP_KERNEL);
365 if (x->encap == NULL)
366 goto error;
367 }
368
369 if (attrs[XFRMA_COADDR]) {
370 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
371 sizeof(*x->coaddr), GFP_KERNEL);
372 if (x->coaddr == NULL)
373 goto error;
374 }
375
376 err = xfrm_init_state(x);
377 if (err)
378 goto error;
379
380 if (attrs[XFRMA_SEC_CTX] &&
381 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
382 goto error;
383
384 x->km.seq = p->seq;
385 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
386 /* sysctl_xfrm_aevent_etime is in 100ms units */
387 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
388 x->preplay.bitmap = 0;
389 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
390 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
391
392 /* override default values from above */
393
394 xfrm_update_ae_params(x, attrs);
395
396 return x;
397
398 error:
399 x->km.state = XFRM_STATE_DEAD;
400 xfrm_state_put(x);
401 error_no_put:
402 *errp = err;
403 return NULL;
404 }
405
406 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
407 struct nlattr **attrs)
408 {
409 struct xfrm_usersa_info *p = nlmsg_data(nlh);
410 struct xfrm_state *x;
411 int err;
412 struct km_event c;
413
414 err = verify_newsa_info(p, attrs);
415 if (err)
416 return err;
417
418 x = xfrm_state_construct(p, attrs, &err);
419 if (!x)
420 return err;
421
422 xfrm_state_hold(x);
423 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
424 err = xfrm_state_add(x);
425 else
426 err = xfrm_state_update(x);
427
428 xfrm_audit_state_add(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
429 NETLINK_CB(skb).sid);
430
431 if (err < 0) {
432 x->km.state = XFRM_STATE_DEAD;
433 __xfrm_state_put(x);
434 goto out;
435 }
436
437 c.seq = nlh->nlmsg_seq;
438 c.pid = nlh->nlmsg_pid;
439 c.event = nlh->nlmsg_type;
440
441 km_state_notify(x, &c);
442 out:
443 xfrm_state_put(x);
444 return err;
445 }
446
447 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
448 struct nlattr **attrs,
449 int *errp)
450 {
451 struct xfrm_state *x = NULL;
452 int err;
453
454 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
455 err = -ESRCH;
456 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
457 } else {
458 xfrm_address_t *saddr = NULL;
459
460 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
461 if (!saddr) {
462 err = -EINVAL;
463 goto out;
464 }
465
466 err = -ESRCH;
467 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
468 p->family);
469 }
470
471 out:
472 if (!x && errp)
473 *errp = err;
474 return x;
475 }
476
477 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
478 struct nlattr **attrs)
479 {
480 struct xfrm_state *x;
481 int err = -ESRCH;
482 struct km_event c;
483 struct xfrm_usersa_id *p = nlmsg_data(nlh);
484
485 x = xfrm_user_state_lookup(p, attrs, &err);
486 if (x == NULL)
487 return err;
488
489 if ((err = security_xfrm_state_delete(x)) != 0)
490 goto out;
491
492 if (xfrm_state_kern(x)) {
493 err = -EPERM;
494 goto out;
495 }
496
497 err = xfrm_state_delete(x);
498
499 if (err < 0)
500 goto out;
501
502 c.seq = nlh->nlmsg_seq;
503 c.pid = nlh->nlmsg_pid;
504 c.event = nlh->nlmsg_type;
505 km_state_notify(x, &c);
506
507 out:
508 xfrm_audit_state_delete(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
509 NETLINK_CB(skb).sid);
510 xfrm_state_put(x);
511 return err;
512 }
513
514 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
515 {
516 memcpy(&p->id, &x->id, sizeof(p->id));
517 memcpy(&p->sel, &x->sel, sizeof(p->sel));
518 memcpy(&p->lft, &x->lft, sizeof(p->lft));
519 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
520 memcpy(&p->stats, &x->stats, sizeof(p->stats));
521 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
522 p->mode = x->props.mode;
523 p->replay_window = x->props.replay_window;
524 p->reqid = x->props.reqid;
525 p->family = x->props.family;
526 p->flags = x->props.flags;
527 p->seq = x->km.seq;
528 }
529
530 struct xfrm_dump_info {
531 struct sk_buff *in_skb;
532 struct sk_buff *out_skb;
533 u32 nlmsg_seq;
534 u16 nlmsg_flags;
535 int start_idx;
536 int this_idx;
537 };
538
539 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
540 {
541 struct xfrm_user_sec_ctx *uctx;
542 struct nlattr *attr;
543 int ctx_size = sizeof(*uctx) + s->ctx_len;
544
545 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
546 if (attr == NULL)
547 return -EMSGSIZE;
548
549 uctx = nla_data(attr);
550 uctx->exttype = XFRMA_SEC_CTX;
551 uctx->len = ctx_size;
552 uctx->ctx_doi = s->ctx_doi;
553 uctx->ctx_alg = s->ctx_alg;
554 uctx->ctx_len = s->ctx_len;
555 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
556
557 return 0;
558 }
559
560 /* Don't change this without updating xfrm_sa_len! */
561 static int copy_to_user_state_extra(struct xfrm_state *x,
562 struct xfrm_usersa_info *p,
563 struct sk_buff *skb)
564 {
565 copy_to_user_state(x, p);
566
567 if (x->coaddr)
568 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
569
570 if (x->lastused)
571 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
572
573 if (x->aead)
574 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
575 if (x->aalg)
576 NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
577 if (x->ealg)
578 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
579 if (x->calg)
580 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
581
582 if (x->encap)
583 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
584
585 if (x->security && copy_sec_ctx(x->security, skb) < 0)
586 goto nla_put_failure;
587
588 return 0;
589
590 nla_put_failure:
591 return -EMSGSIZE;
592 }
593
594 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
595 {
596 struct xfrm_dump_info *sp = ptr;
597 struct sk_buff *in_skb = sp->in_skb;
598 struct sk_buff *skb = sp->out_skb;
599 struct xfrm_usersa_info *p;
600 struct nlmsghdr *nlh;
601 int err;
602
603 if (sp->this_idx < sp->start_idx)
604 goto out;
605
606 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
607 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
608 if (nlh == NULL)
609 return -EMSGSIZE;
610
611 p = nlmsg_data(nlh);
612
613 err = copy_to_user_state_extra(x, p, skb);
614 if (err)
615 goto nla_put_failure;
616
617 nlmsg_end(skb, nlh);
618 out:
619 sp->this_idx++;
620 return 0;
621
622 nla_put_failure:
623 nlmsg_cancel(skb, nlh);
624 return err;
625 }
626
627 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
628 {
629 struct xfrm_dump_info info;
630
631 info.in_skb = cb->skb;
632 info.out_skb = skb;
633 info.nlmsg_seq = cb->nlh->nlmsg_seq;
634 info.nlmsg_flags = NLM_F_MULTI;
635 info.this_idx = 0;
636 info.start_idx = cb->args[0];
637 (void) xfrm_state_walk(0, dump_one_state, &info);
638 cb->args[0] = info.this_idx;
639
640 return skb->len;
641 }
642
643 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
644 struct xfrm_state *x, u32 seq)
645 {
646 struct xfrm_dump_info info;
647 struct sk_buff *skb;
648
649 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
650 if (!skb)
651 return ERR_PTR(-ENOMEM);
652
653 info.in_skb = in_skb;
654 info.out_skb = skb;
655 info.nlmsg_seq = seq;
656 info.nlmsg_flags = 0;
657 info.this_idx = info.start_idx = 0;
658
659 if (dump_one_state(x, 0, &info)) {
660 kfree_skb(skb);
661 return NULL;
662 }
663
664 return skb;
665 }
666
667 static inline size_t xfrm_spdinfo_msgsize(void)
668 {
669 return NLMSG_ALIGN(4)
670 + nla_total_size(sizeof(struct xfrmu_spdinfo))
671 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
672 }
673
674 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
675 {
676 struct xfrmk_spdinfo si;
677 struct xfrmu_spdinfo spc;
678 struct xfrmu_spdhinfo sph;
679 struct nlmsghdr *nlh;
680 u32 *f;
681
682 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
683 if (nlh == NULL) /* shouldnt really happen ... */
684 return -EMSGSIZE;
685
686 f = nlmsg_data(nlh);
687 *f = flags;
688 xfrm_spd_getinfo(&si);
689 spc.incnt = si.incnt;
690 spc.outcnt = si.outcnt;
691 spc.fwdcnt = si.fwdcnt;
692 spc.inscnt = si.inscnt;
693 spc.outscnt = si.outscnt;
694 spc.fwdscnt = si.fwdscnt;
695 sph.spdhcnt = si.spdhcnt;
696 sph.spdhmcnt = si.spdhmcnt;
697
698 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
699 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
700
701 return nlmsg_end(skb, nlh);
702
703 nla_put_failure:
704 nlmsg_cancel(skb, nlh);
705 return -EMSGSIZE;
706 }
707
708 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
709 struct nlattr **attrs)
710 {
711 struct sk_buff *r_skb;
712 u32 *flags = nlmsg_data(nlh);
713 u32 spid = NETLINK_CB(skb).pid;
714 u32 seq = nlh->nlmsg_seq;
715
716 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
717 if (r_skb == NULL)
718 return -ENOMEM;
719
720 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
721 BUG();
722
723 return nlmsg_unicast(xfrm_nl, r_skb, spid);
724 }
725
726 static inline size_t xfrm_sadinfo_msgsize(void)
727 {
728 return NLMSG_ALIGN(4)
729 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
730 + nla_total_size(4); /* XFRMA_SAD_CNT */
731 }
732
733 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
734 {
735 struct xfrmk_sadinfo si;
736 struct xfrmu_sadhinfo sh;
737 struct nlmsghdr *nlh;
738 u32 *f;
739
740 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
741 if (nlh == NULL) /* shouldnt really happen ... */
742 return -EMSGSIZE;
743
744 f = nlmsg_data(nlh);
745 *f = flags;
746 xfrm_sad_getinfo(&si);
747
748 sh.sadhmcnt = si.sadhmcnt;
749 sh.sadhcnt = si.sadhcnt;
750
751 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
752 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
753
754 return nlmsg_end(skb, nlh);
755
756 nla_put_failure:
757 nlmsg_cancel(skb, nlh);
758 return -EMSGSIZE;
759 }
760
761 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
762 struct nlattr **attrs)
763 {
764 struct sk_buff *r_skb;
765 u32 *flags = nlmsg_data(nlh);
766 u32 spid = NETLINK_CB(skb).pid;
767 u32 seq = nlh->nlmsg_seq;
768
769 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
770 if (r_skb == NULL)
771 return -ENOMEM;
772
773 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
774 BUG();
775
776 return nlmsg_unicast(xfrm_nl, r_skb, spid);
777 }
778
779 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
780 struct nlattr **attrs)
781 {
782 struct xfrm_usersa_id *p = nlmsg_data(nlh);
783 struct xfrm_state *x;
784 struct sk_buff *resp_skb;
785 int err = -ESRCH;
786
787 x = xfrm_user_state_lookup(p, attrs, &err);
788 if (x == NULL)
789 goto out_noput;
790
791 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
792 if (IS_ERR(resp_skb)) {
793 err = PTR_ERR(resp_skb);
794 } else {
795 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
796 }
797 xfrm_state_put(x);
798 out_noput:
799 return err;
800 }
801
802 static int verify_userspi_info(struct xfrm_userspi_info *p)
803 {
804 switch (p->info.id.proto) {
805 case IPPROTO_AH:
806 case IPPROTO_ESP:
807 break;
808
809 case IPPROTO_COMP:
810 /* IPCOMP spi is 16-bits. */
811 if (p->max >= 0x10000)
812 return -EINVAL;
813 break;
814
815 default:
816 return -EINVAL;
817 }
818
819 if (p->min > p->max)
820 return -EINVAL;
821
822 return 0;
823 }
824
825 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
826 struct nlattr **attrs)
827 {
828 struct xfrm_state *x;
829 struct xfrm_userspi_info *p;
830 struct sk_buff *resp_skb;
831 xfrm_address_t *daddr;
832 int family;
833 int err;
834
835 p = nlmsg_data(nlh);
836 err = verify_userspi_info(p);
837 if (err)
838 goto out_noput;
839
840 family = p->info.family;
841 daddr = &p->info.id.daddr;
842
843 x = NULL;
844 if (p->info.seq) {
845 x = xfrm_find_acq_byseq(p->info.seq);
846 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
847 xfrm_state_put(x);
848 x = NULL;
849 }
850 }
851
852 if (!x)
853 x = xfrm_find_acq(p->info.mode, p->info.reqid,
854 p->info.id.proto, daddr,
855 &p->info.saddr, 1,
856 family);
857 err = -ENOENT;
858 if (x == NULL)
859 goto out_noput;
860
861 err = xfrm_alloc_spi(x, p->min, p->max);
862 if (err)
863 goto out;
864
865 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
866 if (IS_ERR(resp_skb)) {
867 err = PTR_ERR(resp_skb);
868 goto out;
869 }
870
871 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
872
873 out:
874 xfrm_state_put(x);
875 out_noput:
876 return err;
877 }
878
879 static int verify_policy_dir(u8 dir)
880 {
881 switch (dir) {
882 case XFRM_POLICY_IN:
883 case XFRM_POLICY_OUT:
884 case XFRM_POLICY_FWD:
885 break;
886
887 default:
888 return -EINVAL;
889 }
890
891 return 0;
892 }
893
894 static int verify_policy_type(u8 type)
895 {
896 switch (type) {
897 case XFRM_POLICY_TYPE_MAIN:
898 #ifdef CONFIG_XFRM_SUB_POLICY
899 case XFRM_POLICY_TYPE_SUB:
900 #endif
901 break;
902
903 default:
904 return -EINVAL;
905 }
906
907 return 0;
908 }
909
910 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
911 {
912 switch (p->share) {
913 case XFRM_SHARE_ANY:
914 case XFRM_SHARE_SESSION:
915 case XFRM_SHARE_USER:
916 case XFRM_SHARE_UNIQUE:
917 break;
918
919 default:
920 return -EINVAL;
921 }
922
923 switch (p->action) {
924 case XFRM_POLICY_ALLOW:
925 case XFRM_POLICY_BLOCK:
926 break;
927
928 default:
929 return -EINVAL;
930 }
931
932 switch (p->sel.family) {
933 case AF_INET:
934 break;
935
936 case AF_INET6:
937 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
938 break;
939 #else
940 return -EAFNOSUPPORT;
941 #endif
942
943 default:
944 return -EINVAL;
945 }
946
947 return verify_policy_dir(p->dir);
948 }
949
950 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
951 {
952 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
953 struct xfrm_user_sec_ctx *uctx;
954
955 if (!rt)
956 return 0;
957
958 uctx = nla_data(rt);
959 return security_xfrm_policy_alloc(pol, uctx);
960 }
961
962 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
963 int nr)
964 {
965 int i;
966
967 xp->xfrm_nr = nr;
968 for (i = 0; i < nr; i++, ut++) {
969 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
970
971 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
972 memcpy(&t->saddr, &ut->saddr,
973 sizeof(xfrm_address_t));
974 t->reqid = ut->reqid;
975 t->mode = ut->mode;
976 t->share = ut->share;
977 t->optional = ut->optional;
978 t->aalgos = ut->aalgos;
979 t->ealgos = ut->ealgos;
980 t->calgos = ut->calgos;
981 t->encap_family = ut->family;
982 }
983 }
984
985 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
986 {
987 int i;
988
989 if (nr > XFRM_MAX_DEPTH)
990 return -EINVAL;
991
992 for (i = 0; i < nr; i++) {
993 /* We never validated the ut->family value, so many
994 * applications simply leave it at zero. The check was
995 * never made and ut->family was ignored because all
996 * templates could be assumed to have the same family as
997 * the policy itself. Now that we will have ipv4-in-ipv6
998 * and ipv6-in-ipv4 tunnels, this is no longer true.
999 */
1000 if (!ut[i].family)
1001 ut[i].family = family;
1002
1003 switch (ut[i].family) {
1004 case AF_INET:
1005 break;
1006 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1007 case AF_INET6:
1008 break;
1009 #endif
1010 default:
1011 return -EINVAL;
1012 }
1013 }
1014
1015 return 0;
1016 }
1017
1018 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1019 {
1020 struct nlattr *rt = attrs[XFRMA_TMPL];
1021
1022 if (!rt) {
1023 pol->xfrm_nr = 0;
1024 } else {
1025 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1026 int nr = nla_len(rt) / sizeof(*utmpl);
1027 int err;
1028
1029 err = validate_tmpl(nr, utmpl, pol->family);
1030 if (err)
1031 return err;
1032
1033 copy_templates(pol, utmpl, nr);
1034 }
1035 return 0;
1036 }
1037
1038 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1039 {
1040 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1041 struct xfrm_userpolicy_type *upt;
1042 u8 type = XFRM_POLICY_TYPE_MAIN;
1043 int err;
1044
1045 if (rt) {
1046 upt = nla_data(rt);
1047 type = upt->type;
1048 }
1049
1050 err = verify_policy_type(type);
1051 if (err)
1052 return err;
1053
1054 *tp = type;
1055 return 0;
1056 }
1057
1058 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1059 {
1060 xp->priority = p->priority;
1061 xp->index = p->index;
1062 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1063 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1064 xp->action = p->action;
1065 xp->flags = p->flags;
1066 xp->family = p->sel.family;
1067 /* XXX xp->share = p->share; */
1068 }
1069
1070 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1071 {
1072 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1073 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1074 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1075 p->priority = xp->priority;
1076 p->index = xp->index;
1077 p->sel.family = xp->family;
1078 p->dir = dir;
1079 p->action = xp->action;
1080 p->flags = xp->flags;
1081 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1082 }
1083
1084 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1085 {
1086 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1087 int err;
1088
1089 if (!xp) {
1090 *errp = -ENOMEM;
1091 return NULL;
1092 }
1093
1094 copy_from_user_policy(xp, p);
1095
1096 err = copy_from_user_policy_type(&xp->type, attrs);
1097 if (err)
1098 goto error;
1099
1100 if (!(err = copy_from_user_tmpl(xp, attrs)))
1101 err = copy_from_user_sec_ctx(xp, attrs);
1102 if (err)
1103 goto error;
1104
1105 return xp;
1106 error:
1107 *errp = err;
1108 xp->dead = 1;
1109 xfrm_policy_destroy(xp);
1110 return NULL;
1111 }
1112
1113 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1114 struct nlattr **attrs)
1115 {
1116 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1117 struct xfrm_policy *xp;
1118 struct km_event c;
1119 int err;
1120 int excl;
1121
1122 err = verify_newpolicy_info(p);
1123 if (err)
1124 return err;
1125 err = verify_sec_ctx_len(attrs);
1126 if (err)
1127 return err;
1128
1129 xp = xfrm_policy_construct(p, attrs, &err);
1130 if (!xp)
1131 return err;
1132
1133 /* shouldnt excl be based on nlh flags??
1134 * Aha! this is anti-netlink really i.e more pfkey derived
1135 * in netlink excl is a flag and you wouldnt need
1136 * a type XFRM_MSG_UPDPOLICY - JHS */
1137 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1138 err = xfrm_policy_insert(p->dir, xp, excl);
1139 xfrm_audit_policy_add(xp, err ? 0 : 1, NETLINK_CB(skb).loginuid,
1140 NETLINK_CB(skb).sid);
1141
1142 if (err) {
1143 security_xfrm_policy_free(xp);
1144 kfree(xp);
1145 return err;
1146 }
1147
1148 c.event = nlh->nlmsg_type;
1149 c.seq = nlh->nlmsg_seq;
1150 c.pid = nlh->nlmsg_pid;
1151 km_policy_notify(xp, p->dir, &c);
1152
1153 xfrm_pol_put(xp);
1154
1155 return 0;
1156 }
1157
1158 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1159 {
1160 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1161 int i;
1162
1163 if (xp->xfrm_nr == 0)
1164 return 0;
1165
1166 for (i = 0; i < xp->xfrm_nr; i++) {
1167 struct xfrm_user_tmpl *up = &vec[i];
1168 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1169
1170 memcpy(&up->id, &kp->id, sizeof(up->id));
1171 up->family = kp->encap_family;
1172 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1173 up->reqid = kp->reqid;
1174 up->mode = kp->mode;
1175 up->share = kp->share;
1176 up->optional = kp->optional;
1177 up->aalgos = kp->aalgos;
1178 up->ealgos = kp->ealgos;
1179 up->calgos = kp->calgos;
1180 }
1181
1182 return nla_put(skb, XFRMA_TMPL,
1183 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1184 }
1185
1186 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1187 {
1188 if (x->security) {
1189 return copy_sec_ctx(x->security, skb);
1190 }
1191 return 0;
1192 }
1193
1194 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1195 {
1196 if (xp->security) {
1197 return copy_sec_ctx(xp->security, skb);
1198 }
1199 return 0;
1200 }
1201 static inline size_t userpolicy_type_attrsize(void)
1202 {
1203 #ifdef CONFIG_XFRM_SUB_POLICY
1204 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1205 #else
1206 return 0;
1207 #endif
1208 }
1209
1210 #ifdef CONFIG_XFRM_SUB_POLICY
1211 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1212 {
1213 struct xfrm_userpolicy_type upt = {
1214 .type = type,
1215 };
1216
1217 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1218 }
1219
1220 #else
1221 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1222 {
1223 return 0;
1224 }
1225 #endif
1226
1227 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1228 {
1229 struct xfrm_dump_info *sp = ptr;
1230 struct xfrm_userpolicy_info *p;
1231 struct sk_buff *in_skb = sp->in_skb;
1232 struct sk_buff *skb = sp->out_skb;
1233 struct nlmsghdr *nlh;
1234
1235 if (sp->this_idx < sp->start_idx)
1236 goto out;
1237
1238 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1239 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1240 if (nlh == NULL)
1241 return -EMSGSIZE;
1242
1243 p = nlmsg_data(nlh);
1244 copy_to_user_policy(xp, p, dir);
1245 if (copy_to_user_tmpl(xp, skb) < 0)
1246 goto nlmsg_failure;
1247 if (copy_to_user_sec_ctx(xp, skb))
1248 goto nlmsg_failure;
1249 if (copy_to_user_policy_type(xp->type, skb) < 0)
1250 goto nlmsg_failure;
1251
1252 nlmsg_end(skb, nlh);
1253 out:
1254 sp->this_idx++;
1255 return 0;
1256
1257 nlmsg_failure:
1258 nlmsg_cancel(skb, nlh);
1259 return -EMSGSIZE;
1260 }
1261
1262 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1263 {
1264 struct xfrm_dump_info info;
1265
1266 info.in_skb = cb->skb;
1267 info.out_skb = skb;
1268 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1269 info.nlmsg_flags = NLM_F_MULTI;
1270 info.this_idx = 0;
1271 info.start_idx = cb->args[0];
1272 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1273 #ifdef CONFIG_XFRM_SUB_POLICY
1274 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1275 #endif
1276 cb->args[0] = info.this_idx;
1277
1278 return skb->len;
1279 }
1280
1281 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1282 struct xfrm_policy *xp,
1283 int dir, u32 seq)
1284 {
1285 struct xfrm_dump_info info;
1286 struct sk_buff *skb;
1287
1288 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1289 if (!skb)
1290 return ERR_PTR(-ENOMEM);
1291
1292 info.in_skb = in_skb;
1293 info.out_skb = skb;
1294 info.nlmsg_seq = seq;
1295 info.nlmsg_flags = 0;
1296 info.this_idx = info.start_idx = 0;
1297
1298 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1299 kfree_skb(skb);
1300 return NULL;
1301 }
1302
1303 return skb;
1304 }
1305
1306 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1307 struct nlattr **attrs)
1308 {
1309 struct xfrm_policy *xp;
1310 struct xfrm_userpolicy_id *p;
1311 u8 type = XFRM_POLICY_TYPE_MAIN;
1312 int err;
1313 struct km_event c;
1314 int delete;
1315
1316 p = nlmsg_data(nlh);
1317 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1318
1319 err = copy_from_user_policy_type(&type, attrs);
1320 if (err)
1321 return err;
1322
1323 err = verify_policy_dir(p->dir);
1324 if (err)
1325 return err;
1326
1327 if (p->index)
1328 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1329 else {
1330 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1331 struct xfrm_policy tmp;
1332
1333 err = verify_sec_ctx_len(attrs);
1334 if (err)
1335 return err;
1336
1337 memset(&tmp, 0, sizeof(struct xfrm_policy));
1338 if (rt) {
1339 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1340
1341 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1342 return err;
1343 }
1344 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1345 delete, &err);
1346 security_xfrm_policy_free(&tmp);
1347 }
1348 if (xp == NULL)
1349 return -ENOENT;
1350
1351 if (!delete) {
1352 struct sk_buff *resp_skb;
1353
1354 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1355 if (IS_ERR(resp_skb)) {
1356 err = PTR_ERR(resp_skb);
1357 } else {
1358 err = nlmsg_unicast(xfrm_nl, resp_skb,
1359 NETLINK_CB(skb).pid);
1360 }
1361 } else {
1362 xfrm_audit_policy_delete(xp, err ? 0 : 1,
1363 NETLINK_CB(skb).loginuid,
1364 NETLINK_CB(skb).sid);
1365
1366 if (err != 0)
1367 goto out;
1368
1369 c.data.byid = p->index;
1370 c.event = nlh->nlmsg_type;
1371 c.seq = nlh->nlmsg_seq;
1372 c.pid = nlh->nlmsg_pid;
1373 km_policy_notify(xp, p->dir, &c);
1374 }
1375
1376 out:
1377 xfrm_pol_put(xp);
1378 return err;
1379 }
1380
1381 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1382 struct nlattr **attrs)
1383 {
1384 struct km_event c;
1385 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1386 struct xfrm_audit audit_info;
1387 int err;
1388
1389 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1390 audit_info.secid = NETLINK_CB(skb).sid;
1391 err = xfrm_state_flush(p->proto, &audit_info);
1392 if (err)
1393 return err;
1394 c.data.proto = p->proto;
1395 c.event = nlh->nlmsg_type;
1396 c.seq = nlh->nlmsg_seq;
1397 c.pid = nlh->nlmsg_pid;
1398 km_state_notify(NULL, &c);
1399
1400 return 0;
1401 }
1402
1403 static inline size_t xfrm_aevent_msgsize(void)
1404 {
1405 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1406 + nla_total_size(sizeof(struct xfrm_replay_state))
1407 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1408 + nla_total_size(4) /* XFRM_AE_RTHR */
1409 + nla_total_size(4); /* XFRM_AE_ETHR */
1410 }
1411
1412 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1413 {
1414 struct xfrm_aevent_id *id;
1415 struct nlmsghdr *nlh;
1416
1417 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1418 if (nlh == NULL)
1419 return -EMSGSIZE;
1420
1421 id = nlmsg_data(nlh);
1422 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1423 id->sa_id.spi = x->id.spi;
1424 id->sa_id.family = x->props.family;
1425 id->sa_id.proto = x->id.proto;
1426 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1427 id->reqid = x->props.reqid;
1428 id->flags = c->data.aevent;
1429
1430 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1431 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1432
1433 if (id->flags & XFRM_AE_RTHR)
1434 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1435
1436 if (id->flags & XFRM_AE_ETHR)
1437 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1438 x->replay_maxage * 10 / HZ);
1439
1440 return nlmsg_end(skb, nlh);
1441
1442 nla_put_failure:
1443 nlmsg_cancel(skb, nlh);
1444 return -EMSGSIZE;
1445 }
1446
1447 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1448 struct nlattr **attrs)
1449 {
1450 struct xfrm_state *x;
1451 struct sk_buff *r_skb;
1452 int err;
1453 struct km_event c;
1454 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1455 struct xfrm_usersa_id *id = &p->sa_id;
1456
1457 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1458 if (r_skb == NULL)
1459 return -ENOMEM;
1460
1461 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1462 if (x == NULL) {
1463 kfree_skb(r_skb);
1464 return -ESRCH;
1465 }
1466
1467 /*
1468 * XXX: is this lock really needed - none of the other
1469 * gets lock (the concern is things getting updated
1470 * while we are still reading) - jhs
1471 */
1472 spin_lock_bh(&x->lock);
1473 c.data.aevent = p->flags;
1474 c.seq = nlh->nlmsg_seq;
1475 c.pid = nlh->nlmsg_pid;
1476
1477 if (build_aevent(r_skb, x, &c) < 0)
1478 BUG();
1479 err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
1480 spin_unlock_bh(&x->lock);
1481 xfrm_state_put(x);
1482 return err;
1483 }
1484
1485 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1486 struct nlattr **attrs)
1487 {
1488 struct xfrm_state *x;
1489 struct km_event c;
1490 int err = - EINVAL;
1491 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1492 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1493 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1494
1495 if (!lt && !rp)
1496 return err;
1497
1498 /* pedantic mode - thou shalt sayeth replaceth */
1499 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1500 return err;
1501
1502 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1503 if (x == NULL)
1504 return -ESRCH;
1505
1506 if (x->km.state != XFRM_STATE_VALID)
1507 goto out;
1508
1509 spin_lock_bh(&x->lock);
1510 xfrm_update_ae_params(x, attrs);
1511 spin_unlock_bh(&x->lock);
1512
1513 c.event = nlh->nlmsg_type;
1514 c.seq = nlh->nlmsg_seq;
1515 c.pid = nlh->nlmsg_pid;
1516 c.data.aevent = XFRM_AE_CU;
1517 km_state_notify(x, &c);
1518 err = 0;
1519 out:
1520 xfrm_state_put(x);
1521 return err;
1522 }
1523
1524 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1525 struct nlattr **attrs)
1526 {
1527 struct km_event c;
1528 u8 type = XFRM_POLICY_TYPE_MAIN;
1529 int err;
1530 struct xfrm_audit audit_info;
1531
1532 err = copy_from_user_policy_type(&type, attrs);
1533 if (err)
1534 return err;
1535
1536 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1537 audit_info.secid = NETLINK_CB(skb).sid;
1538 err = xfrm_policy_flush(type, &audit_info);
1539 if (err)
1540 return err;
1541 c.data.type = type;
1542 c.event = nlh->nlmsg_type;
1543 c.seq = nlh->nlmsg_seq;
1544 c.pid = nlh->nlmsg_pid;
1545 km_policy_notify(NULL, 0, &c);
1546 return 0;
1547 }
1548
1549 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1550 struct nlattr **attrs)
1551 {
1552 struct xfrm_policy *xp;
1553 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1554 struct xfrm_userpolicy_info *p = &up->pol;
1555 u8 type = XFRM_POLICY_TYPE_MAIN;
1556 int err = -ENOENT;
1557
1558 err = copy_from_user_policy_type(&type, attrs);
1559 if (err)
1560 return err;
1561
1562 if (p->index)
1563 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1564 else {
1565 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1566 struct xfrm_policy tmp;
1567
1568 err = verify_sec_ctx_len(attrs);
1569 if (err)
1570 return err;
1571
1572 memset(&tmp, 0, sizeof(struct xfrm_policy));
1573 if (rt) {
1574 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1575
1576 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1577 return err;
1578 }
1579 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1580 0, &err);
1581 security_xfrm_policy_free(&tmp);
1582 }
1583
1584 if (xp == NULL)
1585 return -ENOENT;
1586 read_lock(&xp->lock);
1587 if (xp->dead) {
1588 read_unlock(&xp->lock);
1589 goto out;
1590 }
1591
1592 read_unlock(&xp->lock);
1593 err = 0;
1594 if (up->hard) {
1595 xfrm_policy_delete(xp, p->dir);
1596 xfrm_audit_policy_delete(xp, 1, NETLINK_CB(skb).loginuid,
1597 NETLINK_CB(skb).sid);
1598
1599 } else {
1600 // reset the timers here?
1601 printk("Dont know what to do with soft policy expire\n");
1602 }
1603 km_policy_expired(xp, p->dir, up->hard, current->pid);
1604
1605 out:
1606 xfrm_pol_put(xp);
1607 return err;
1608 }
1609
1610 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1611 struct nlattr **attrs)
1612 {
1613 struct xfrm_state *x;
1614 int err;
1615 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1616 struct xfrm_usersa_info *p = &ue->state;
1617
1618 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1619
1620 err = -ENOENT;
1621 if (x == NULL)
1622 return err;
1623
1624 spin_lock_bh(&x->lock);
1625 err = -EINVAL;
1626 if (x->km.state != XFRM_STATE_VALID)
1627 goto out;
1628 km_state_expired(x, ue->hard, current->pid);
1629
1630 if (ue->hard) {
1631 __xfrm_state_delete(x);
1632 xfrm_audit_state_delete(x, 1, NETLINK_CB(skb).loginuid,
1633 NETLINK_CB(skb).sid);
1634 }
1635 err = 0;
1636 out:
1637 spin_unlock_bh(&x->lock);
1638 xfrm_state_put(x);
1639 return err;
1640 }
1641
1642 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1643 struct nlattr **attrs)
1644 {
1645 struct xfrm_policy *xp;
1646 struct xfrm_user_tmpl *ut;
1647 int i;
1648 struct nlattr *rt = attrs[XFRMA_TMPL];
1649
1650 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1651 struct xfrm_state *x = xfrm_state_alloc();
1652 int err = -ENOMEM;
1653
1654 if (!x)
1655 return err;
1656
1657 err = verify_newpolicy_info(&ua->policy);
1658 if (err) {
1659 printk("BAD policy passed\n");
1660 kfree(x);
1661 return err;
1662 }
1663
1664 /* build an XP */
1665 xp = xfrm_policy_construct(&ua->policy, attrs, &err);
1666 if (!xp) {
1667 kfree(x);
1668 return err;
1669 }
1670
1671 memcpy(&x->id, &ua->id, sizeof(ua->id));
1672 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1673 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1674
1675 ut = nla_data(rt);
1676 /* extract the templates and for each call km_key */
1677 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1678 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1679 memcpy(&x->id, &t->id, sizeof(x->id));
1680 x->props.mode = t->mode;
1681 x->props.reqid = t->reqid;
1682 x->props.family = ut->family;
1683 t->aalgos = ua->aalgos;
1684 t->ealgos = ua->ealgos;
1685 t->calgos = ua->calgos;
1686 err = km_query(x, t, xp);
1687
1688 }
1689
1690 kfree(x);
1691 kfree(xp);
1692
1693 return 0;
1694 }
1695
1696 #ifdef CONFIG_XFRM_MIGRATE
1697 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1698 struct nlattr **attrs, int *num)
1699 {
1700 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1701 struct xfrm_user_migrate *um;
1702 int i, num_migrate;
1703
1704 um = nla_data(rt);
1705 num_migrate = nla_len(rt) / sizeof(*um);
1706
1707 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1708 return -EINVAL;
1709
1710 for (i = 0; i < num_migrate; i++, um++, ma++) {
1711 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1712 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1713 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1714 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1715
1716 ma->proto = um->proto;
1717 ma->mode = um->mode;
1718 ma->reqid = um->reqid;
1719
1720 ma->old_family = um->old_family;
1721 ma->new_family = um->new_family;
1722 }
1723
1724 *num = i;
1725 return 0;
1726 }
1727
1728 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1729 struct nlattr **attrs)
1730 {
1731 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1732 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1733 u8 type;
1734 int err;
1735 int n = 0;
1736
1737 if (attrs[XFRMA_MIGRATE] == NULL)
1738 return -EINVAL;
1739
1740 err = copy_from_user_policy_type(&type, attrs);
1741 if (err)
1742 return err;
1743
1744 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1745 attrs, &n);
1746 if (err)
1747 return err;
1748
1749 if (!n)
1750 return 0;
1751
1752 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1753
1754 return 0;
1755 }
1756 #else
1757 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1758 struct nlattr **attrs)
1759 {
1760 return -ENOPROTOOPT;
1761 }
1762 #endif
1763
1764 #ifdef CONFIG_XFRM_MIGRATE
1765 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1766 {
1767 struct xfrm_user_migrate um;
1768
1769 memset(&um, 0, sizeof(um));
1770 um.proto = m->proto;
1771 um.mode = m->mode;
1772 um.reqid = m->reqid;
1773 um.old_family = m->old_family;
1774 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1775 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1776 um.new_family = m->new_family;
1777 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1778 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1779
1780 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1781 }
1782
1783 static inline size_t xfrm_migrate_msgsize(int num_migrate)
1784 {
1785 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1786 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1787 + userpolicy_type_attrsize();
1788 }
1789
1790 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1791 int num_migrate, struct xfrm_selector *sel,
1792 u8 dir, u8 type)
1793 {
1794 struct xfrm_migrate *mp;
1795 struct xfrm_userpolicy_id *pol_id;
1796 struct nlmsghdr *nlh;
1797 int i;
1798
1799 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1800 if (nlh == NULL)
1801 return -EMSGSIZE;
1802
1803 pol_id = nlmsg_data(nlh);
1804 /* copy data from selector, dir, and type to the pol_id */
1805 memset(pol_id, 0, sizeof(*pol_id));
1806 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1807 pol_id->dir = dir;
1808
1809 if (copy_to_user_policy_type(type, skb) < 0)
1810 goto nlmsg_failure;
1811
1812 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1813 if (copy_to_user_migrate(mp, skb) < 0)
1814 goto nlmsg_failure;
1815 }
1816
1817 return nlmsg_end(skb, nlh);
1818 nlmsg_failure:
1819 nlmsg_cancel(skb, nlh);
1820 return -EMSGSIZE;
1821 }
1822
1823 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1824 struct xfrm_migrate *m, int num_migrate)
1825 {
1826 struct sk_buff *skb;
1827
1828 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
1829 if (skb == NULL)
1830 return -ENOMEM;
1831
1832 /* build migrate */
1833 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1834 BUG();
1835
1836 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
1837 }
1838 #else
1839 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1840 struct xfrm_migrate *m, int num_migrate)
1841 {
1842 return -ENOPROTOOPT;
1843 }
1844 #endif
1845
1846 #define XMSGSIZE(type) sizeof(struct type)
1847
1848 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1849 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1850 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1851 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1852 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1853 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1854 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1855 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1856 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1857 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1858 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1859 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1860 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1861 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1862 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
1863 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1864 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1865 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1866 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1867 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
1868 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1869 };
1870
1871 #undef XMSGSIZE
1872
1873 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1874 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
1875 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
1876 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
1877 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
1878 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
1879 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
1880 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
1881 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
1882 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
1883 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
1884 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
1885 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
1886 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
1887 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
1888 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
1889 };
1890
1891 static struct xfrm_link {
1892 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1893 int (*dump)(struct sk_buff *, struct netlink_callback *);
1894 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1895 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1896 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1897 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1898 .dump = xfrm_dump_sa },
1899 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1900 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1901 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1902 .dump = xfrm_dump_policy },
1903 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1904 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1905 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1906 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1907 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1908 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1909 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1910 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1911 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1912 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1913 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1914 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1915 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1916 };
1917
1918 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1919 {
1920 struct nlattr *attrs[XFRMA_MAX+1];
1921 struct xfrm_link *link;
1922 int type, err;
1923
1924 type = nlh->nlmsg_type;
1925 if (type > XFRM_MSG_MAX)
1926 return -EINVAL;
1927
1928 type -= XFRM_MSG_BASE;
1929 link = &xfrm_dispatch[type];
1930
1931 /* All operations require privileges, even GET */
1932 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1933 return -EPERM;
1934
1935 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1936 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1937 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1938 if (link->dump == NULL)
1939 return -EINVAL;
1940
1941 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
1942 }
1943
1944 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
1945 xfrma_policy);
1946 if (err < 0)
1947 return err;
1948
1949 if (link->doit == NULL)
1950 return -EINVAL;
1951
1952 return link->doit(skb, nlh, attrs);
1953 }
1954
1955 static void xfrm_netlink_rcv(struct sk_buff *skb)
1956 {
1957 mutex_lock(&xfrm_cfg_mutex);
1958 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
1959 mutex_unlock(&xfrm_cfg_mutex);
1960 }
1961
1962 static inline size_t xfrm_expire_msgsize(void)
1963 {
1964 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
1965 }
1966
1967 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1968 {
1969 struct xfrm_user_expire *ue;
1970 struct nlmsghdr *nlh;
1971
1972 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
1973 if (nlh == NULL)
1974 return -EMSGSIZE;
1975
1976 ue = nlmsg_data(nlh);
1977 copy_to_user_state(x, &ue->state);
1978 ue->hard = (c->data.hard != 0) ? 1 : 0;
1979
1980 return nlmsg_end(skb, nlh);
1981 }
1982
1983 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1984 {
1985 struct sk_buff *skb;
1986
1987 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1988 if (skb == NULL)
1989 return -ENOMEM;
1990
1991 if (build_expire(skb, x, c) < 0)
1992 BUG();
1993
1994 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1995 }
1996
1997 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1998 {
1999 struct sk_buff *skb;
2000
2001 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2002 if (skb == NULL)
2003 return -ENOMEM;
2004
2005 if (build_aevent(skb, x, c) < 0)
2006 BUG();
2007
2008 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2009 }
2010
2011 static int xfrm_notify_sa_flush(struct km_event *c)
2012 {
2013 struct xfrm_usersa_flush *p;
2014 struct nlmsghdr *nlh;
2015 struct sk_buff *skb;
2016 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2017
2018 skb = nlmsg_new(len, GFP_ATOMIC);
2019 if (skb == NULL)
2020 return -ENOMEM;
2021
2022 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2023 if (nlh == NULL) {
2024 kfree_skb(skb);
2025 return -EMSGSIZE;
2026 }
2027
2028 p = nlmsg_data(nlh);
2029 p->proto = c->data.proto;
2030
2031 nlmsg_end(skb, nlh);
2032
2033 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2034 }
2035
2036 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2037 {
2038 size_t l = 0;
2039 if (x->aead)
2040 l += nla_total_size(aead_len(x->aead));
2041 if (x->aalg)
2042 l += nla_total_size(xfrm_alg_len(x->aalg));
2043 if (x->ealg)
2044 l += nla_total_size(xfrm_alg_len(x->ealg));
2045 if (x->calg)
2046 l += nla_total_size(sizeof(*x->calg));
2047 if (x->encap)
2048 l += nla_total_size(sizeof(*x->encap));
2049 if (x->security)
2050 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2051 x->security->ctx_len);
2052 if (x->coaddr)
2053 l += nla_total_size(sizeof(*x->coaddr));
2054
2055 /* Must count x->lastused as it may become non-zero behind our back. */
2056 l += nla_total_size(sizeof(u64));
2057
2058 return l;
2059 }
2060
2061 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2062 {
2063 struct xfrm_usersa_info *p;
2064 struct xfrm_usersa_id *id;
2065 struct nlmsghdr *nlh;
2066 struct sk_buff *skb;
2067 int len = xfrm_sa_len(x);
2068 int headlen;
2069
2070 headlen = sizeof(*p);
2071 if (c->event == XFRM_MSG_DELSA) {
2072 len += nla_total_size(headlen);
2073 headlen = sizeof(*id);
2074 }
2075 len += NLMSG_ALIGN(headlen);
2076
2077 skb = nlmsg_new(len, GFP_ATOMIC);
2078 if (skb == NULL)
2079 return -ENOMEM;
2080
2081 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2082 if (nlh == NULL)
2083 goto nla_put_failure;
2084
2085 p = nlmsg_data(nlh);
2086 if (c->event == XFRM_MSG_DELSA) {
2087 struct nlattr *attr;
2088
2089 id = nlmsg_data(nlh);
2090 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2091 id->spi = x->id.spi;
2092 id->family = x->props.family;
2093 id->proto = x->id.proto;
2094
2095 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2096 if (attr == NULL)
2097 goto nla_put_failure;
2098
2099 p = nla_data(attr);
2100 }
2101
2102 if (copy_to_user_state_extra(x, p, skb))
2103 goto nla_put_failure;
2104
2105 nlmsg_end(skb, nlh);
2106
2107 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2108
2109 nla_put_failure:
2110 /* Somebody screwed up with xfrm_sa_len! */
2111 WARN_ON(1);
2112 kfree_skb(skb);
2113 return -1;
2114 }
2115
2116 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2117 {
2118
2119 switch (c->event) {
2120 case XFRM_MSG_EXPIRE:
2121 return xfrm_exp_state_notify(x, c);
2122 case XFRM_MSG_NEWAE:
2123 return xfrm_aevent_state_notify(x, c);
2124 case XFRM_MSG_DELSA:
2125 case XFRM_MSG_UPDSA:
2126 case XFRM_MSG_NEWSA:
2127 return xfrm_notify_sa(x, c);
2128 case XFRM_MSG_FLUSHSA:
2129 return xfrm_notify_sa_flush(c);
2130 default:
2131 printk("xfrm_user: Unknown SA event %d\n", c->event);
2132 break;
2133 }
2134
2135 return 0;
2136
2137 }
2138
2139 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2140 struct xfrm_policy *xp)
2141 {
2142 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2143 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2144 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2145 + userpolicy_type_attrsize();
2146 }
2147
2148 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2149 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2150 int dir)
2151 {
2152 struct xfrm_user_acquire *ua;
2153 struct nlmsghdr *nlh;
2154 __u32 seq = xfrm_get_acqseq();
2155
2156 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2157 if (nlh == NULL)
2158 return -EMSGSIZE;
2159
2160 ua = nlmsg_data(nlh);
2161 memcpy(&ua->id, &x->id, sizeof(ua->id));
2162 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2163 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2164 copy_to_user_policy(xp, &ua->policy, dir);
2165 ua->aalgos = xt->aalgos;
2166 ua->ealgos = xt->ealgos;
2167 ua->calgos = xt->calgos;
2168 ua->seq = x->km.seq = seq;
2169
2170 if (copy_to_user_tmpl(xp, skb) < 0)
2171 goto nlmsg_failure;
2172 if (copy_to_user_state_sec_ctx(x, skb))
2173 goto nlmsg_failure;
2174 if (copy_to_user_policy_type(xp->type, skb) < 0)
2175 goto nlmsg_failure;
2176
2177 return nlmsg_end(skb, nlh);
2178
2179 nlmsg_failure:
2180 nlmsg_cancel(skb, nlh);
2181 return -EMSGSIZE;
2182 }
2183
2184 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2185 struct xfrm_policy *xp, int dir)
2186 {
2187 struct sk_buff *skb;
2188
2189 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2190 if (skb == NULL)
2191 return -ENOMEM;
2192
2193 if (build_acquire(skb, x, xt, xp, dir) < 0)
2194 BUG();
2195
2196 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2197 }
2198
2199 /* User gives us xfrm_user_policy_info followed by an array of 0
2200 * or more templates.
2201 */
2202 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2203 u8 *data, int len, int *dir)
2204 {
2205 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2206 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2207 struct xfrm_policy *xp;
2208 int nr;
2209
2210 switch (sk->sk_family) {
2211 case AF_INET:
2212 if (opt != IP_XFRM_POLICY) {
2213 *dir = -EOPNOTSUPP;
2214 return NULL;
2215 }
2216 break;
2217 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2218 case AF_INET6:
2219 if (opt != IPV6_XFRM_POLICY) {
2220 *dir = -EOPNOTSUPP;
2221 return NULL;
2222 }
2223 break;
2224 #endif
2225 default:
2226 *dir = -EINVAL;
2227 return NULL;
2228 }
2229
2230 *dir = -EINVAL;
2231
2232 if (len < sizeof(*p) ||
2233 verify_newpolicy_info(p))
2234 return NULL;
2235
2236 nr = ((len - sizeof(*p)) / sizeof(*ut));
2237 if (validate_tmpl(nr, ut, p->sel.family))
2238 return NULL;
2239
2240 if (p->dir > XFRM_POLICY_OUT)
2241 return NULL;
2242
2243 xp = xfrm_policy_alloc(GFP_KERNEL);
2244 if (xp == NULL) {
2245 *dir = -ENOBUFS;
2246 return NULL;
2247 }
2248
2249 copy_from_user_policy(xp, p);
2250 xp->type = XFRM_POLICY_TYPE_MAIN;
2251 copy_templates(xp, ut, nr);
2252
2253 *dir = p->dir;
2254
2255 return xp;
2256 }
2257
2258 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2259 {
2260 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2261 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2262 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2263 + userpolicy_type_attrsize();
2264 }
2265
2266 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2267 int dir, struct km_event *c)
2268 {
2269 struct xfrm_user_polexpire *upe;
2270 struct nlmsghdr *nlh;
2271 int hard = c->data.hard;
2272
2273 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2274 if (nlh == NULL)
2275 return -EMSGSIZE;
2276
2277 upe = nlmsg_data(nlh);
2278 copy_to_user_policy(xp, &upe->pol, dir);
2279 if (copy_to_user_tmpl(xp, skb) < 0)
2280 goto nlmsg_failure;
2281 if (copy_to_user_sec_ctx(xp, skb))
2282 goto nlmsg_failure;
2283 if (copy_to_user_policy_type(xp->type, skb) < 0)
2284 goto nlmsg_failure;
2285 upe->hard = !!hard;
2286
2287 return nlmsg_end(skb, nlh);
2288
2289 nlmsg_failure:
2290 nlmsg_cancel(skb, nlh);
2291 return -EMSGSIZE;
2292 }
2293
2294 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2295 {
2296 struct sk_buff *skb;
2297
2298 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2299 if (skb == NULL)
2300 return -ENOMEM;
2301
2302 if (build_polexpire(skb, xp, dir, c) < 0)
2303 BUG();
2304
2305 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2306 }
2307
2308 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2309 {
2310 struct xfrm_userpolicy_info *p;
2311 struct xfrm_userpolicy_id *id;
2312 struct nlmsghdr *nlh;
2313 struct sk_buff *skb;
2314 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2315 int headlen;
2316
2317 headlen = sizeof(*p);
2318 if (c->event == XFRM_MSG_DELPOLICY) {
2319 len += nla_total_size(headlen);
2320 headlen = sizeof(*id);
2321 }
2322 len += userpolicy_type_attrsize();
2323 len += NLMSG_ALIGN(headlen);
2324
2325 skb = nlmsg_new(len, GFP_ATOMIC);
2326 if (skb == NULL)
2327 return -ENOMEM;
2328
2329 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2330 if (nlh == NULL)
2331 goto nlmsg_failure;
2332
2333 p = nlmsg_data(nlh);
2334 if (c->event == XFRM_MSG_DELPOLICY) {
2335 struct nlattr *attr;
2336
2337 id = nlmsg_data(nlh);
2338 memset(id, 0, sizeof(*id));
2339 id->dir = dir;
2340 if (c->data.byid)
2341 id->index = xp->index;
2342 else
2343 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2344
2345 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2346 if (attr == NULL)
2347 goto nlmsg_failure;
2348
2349 p = nla_data(attr);
2350 }
2351
2352 copy_to_user_policy(xp, p, dir);
2353 if (copy_to_user_tmpl(xp, skb) < 0)
2354 goto nlmsg_failure;
2355 if (copy_to_user_policy_type(xp->type, skb) < 0)
2356 goto nlmsg_failure;
2357
2358 nlmsg_end(skb, nlh);
2359
2360 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2361
2362 nlmsg_failure:
2363 kfree_skb(skb);
2364 return -1;
2365 }
2366
2367 static int xfrm_notify_policy_flush(struct km_event *c)
2368 {
2369 struct nlmsghdr *nlh;
2370 struct sk_buff *skb;
2371
2372 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2373 if (skb == NULL)
2374 return -ENOMEM;
2375
2376 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2377 if (nlh == NULL)
2378 goto nlmsg_failure;
2379 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2380 goto nlmsg_failure;
2381
2382 nlmsg_end(skb, nlh);
2383
2384 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2385
2386 nlmsg_failure:
2387 kfree_skb(skb);
2388 return -1;
2389 }
2390
2391 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2392 {
2393
2394 switch (c->event) {
2395 case XFRM_MSG_NEWPOLICY:
2396 case XFRM_MSG_UPDPOLICY:
2397 case XFRM_MSG_DELPOLICY:
2398 return xfrm_notify_policy(xp, dir, c);
2399 case XFRM_MSG_FLUSHPOLICY:
2400 return xfrm_notify_policy_flush(c);
2401 case XFRM_MSG_POLEXPIRE:
2402 return xfrm_exp_policy_notify(xp, dir, c);
2403 default:
2404 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2405 }
2406
2407 return 0;
2408
2409 }
2410
2411 static inline size_t xfrm_report_msgsize(void)
2412 {
2413 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2414 }
2415
2416 static int build_report(struct sk_buff *skb, u8 proto,
2417 struct xfrm_selector *sel, xfrm_address_t *addr)
2418 {
2419 struct xfrm_user_report *ur;
2420 struct nlmsghdr *nlh;
2421
2422 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2423 if (nlh == NULL)
2424 return -EMSGSIZE;
2425
2426 ur = nlmsg_data(nlh);
2427 ur->proto = proto;
2428 memcpy(&ur->sel, sel, sizeof(ur->sel));
2429
2430 if (addr)
2431 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2432
2433 return nlmsg_end(skb, nlh);
2434
2435 nla_put_failure:
2436 nlmsg_cancel(skb, nlh);
2437 return -EMSGSIZE;
2438 }
2439
2440 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2441 xfrm_address_t *addr)
2442 {
2443 struct sk_buff *skb;
2444
2445 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2446 if (skb == NULL)
2447 return -ENOMEM;
2448
2449 if (build_report(skb, proto, sel, addr) < 0)
2450 BUG();
2451
2452 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2453 }
2454
2455 static struct xfrm_mgr netlink_mgr = {
2456 .id = "netlink",
2457 .notify = xfrm_send_state_notify,
2458 .acquire = xfrm_send_acquire,
2459 .compile_policy = xfrm_compile_policy,
2460 .notify_policy = xfrm_send_policy_notify,
2461 .report = xfrm_send_report,
2462 .migrate = xfrm_send_migrate,
2463 };
2464
2465 static int __init xfrm_user_init(void)
2466 {
2467 struct sock *nlsk;
2468
2469 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2470
2471 nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
2472 xfrm_netlink_rcv, NULL, THIS_MODULE);
2473 if (nlsk == NULL)
2474 return -ENOMEM;
2475 rcu_assign_pointer(xfrm_nl, nlsk);
2476
2477 xfrm_register_km(&netlink_mgr);
2478
2479 return 0;
2480 }
2481
2482 static void __exit xfrm_user_exit(void)
2483 {
2484 struct sock *nlsk = xfrm_nl;
2485
2486 xfrm_unregister_km(&netlink_mgr);
2487 rcu_assign_pointer(xfrm_nl, NULL);
2488 synchronize_rcu();
2489 netlink_kernel_release(nlsk);
2490 }
2491
2492 module_init(xfrm_user_init);
2493 module_exit(xfrm_user_exit);
2494 MODULE_LICENSE("GPL");
2495 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2496
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