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[NETNS]: Create tcp control socket in the each namespace.
[linux-2.6/mini2440.git] / net / xfrm / xfrm_user.c
blob5578c909fcf6ba632cab8c38c3ad5058f1f0a075
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 if (x->props.mode == XFRM_MODE_TRANSPORT)
292 x->sel.family = p->family;
293
294 }
295
296 /*
297 * someday when pfkey also has support, we could have the code
298 * somehow made shareable and move it to xfrm_state.c - JHS
299 *
300 */
301 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
302 {
303 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
304 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
305 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
306 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
307
308 if (rp) {
309 struct xfrm_replay_state *replay;
310 replay = nla_data(rp);
311 memcpy(&x->replay, replay, sizeof(*replay));
312 memcpy(&x->preplay, replay, sizeof(*replay));
313 }
314
315 if (lt) {
316 struct xfrm_lifetime_cur *ltime;
317 ltime = nla_data(lt);
318 x->curlft.bytes = ltime->bytes;
319 x->curlft.packets = ltime->packets;
320 x->curlft.add_time = ltime->add_time;
321 x->curlft.use_time = ltime->use_time;
322 }
323
324 if (et)
325 x->replay_maxage = nla_get_u32(et);
326
327 if (rt)
328 x->replay_maxdiff = nla_get_u32(rt);
329 }
330
331 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
332 struct nlattr **attrs,
333 int *errp)
334 {
335 struct xfrm_state *x = xfrm_state_alloc();
336 int err = -ENOMEM;
337
338 if (!x)
339 goto error_no_put;
340
341 copy_from_user_state(x, p);
342
343 if ((err = attach_aead(&x->aead, &x->props.ealgo,
344 attrs[XFRMA_ALG_AEAD])))
345 goto error;
346 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
347 xfrm_aalg_get_byname,
348 attrs[XFRMA_ALG_AUTH])))
349 goto error;
350 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
351 xfrm_ealg_get_byname,
352 attrs[XFRMA_ALG_CRYPT])))
353 goto error;
354 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
355 xfrm_calg_get_byname,
356 attrs[XFRMA_ALG_COMP])))
357 goto error;
358
359 if (attrs[XFRMA_ENCAP]) {
360 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
361 sizeof(*x->encap), GFP_KERNEL);
362 if (x->encap == NULL)
363 goto error;
364 }
365
366 if (attrs[XFRMA_COADDR]) {
367 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
368 sizeof(*x->coaddr), GFP_KERNEL);
369 if (x->coaddr == NULL)
370 goto error;
371 }
372
373 err = xfrm_init_state(x);
374 if (err)
375 goto error;
376
377 if (attrs[XFRMA_SEC_CTX] &&
378 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
379 goto error;
380
381 x->km.seq = p->seq;
382 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
383 /* sysctl_xfrm_aevent_etime is in 100ms units */
384 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
385 x->preplay.bitmap = 0;
386 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
387 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
388
389 /* override default values from above */
390
391 xfrm_update_ae_params(x, attrs);
392
393 return x;
394
395 error:
396 x->km.state = XFRM_STATE_DEAD;
397 xfrm_state_put(x);
398 error_no_put:
399 *errp = err;
400 return NULL;
401 }
402
403 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
404 struct nlattr **attrs)
405 {
406 struct xfrm_usersa_info *p = nlmsg_data(nlh);
407 struct xfrm_state *x;
408 int err;
409 struct km_event c;
410
411 err = verify_newsa_info(p, attrs);
412 if (err)
413 return err;
414
415 x = xfrm_state_construct(p, attrs, &err);
416 if (!x)
417 return err;
418
419 xfrm_state_hold(x);
420 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
421 err = xfrm_state_add(x);
422 else
423 err = xfrm_state_update(x);
424
425 xfrm_audit_state_add(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
426 NETLINK_CB(skb).sid);
427
428 if (err < 0) {
429 x->km.state = XFRM_STATE_DEAD;
430 __xfrm_state_put(x);
431 goto out;
432 }
433
434 c.seq = nlh->nlmsg_seq;
435 c.pid = nlh->nlmsg_pid;
436 c.event = nlh->nlmsg_type;
437
438 km_state_notify(x, &c);
439 out:
440 xfrm_state_put(x);
441 return err;
442 }
443
444 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
445 struct nlattr **attrs,
446 int *errp)
447 {
448 struct xfrm_state *x = NULL;
449 int err;
450
451 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
452 err = -ESRCH;
453 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
454 } else {
455 xfrm_address_t *saddr = NULL;
456
457 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
458 if (!saddr) {
459 err = -EINVAL;
460 goto out;
461 }
462
463 err = -ESRCH;
464 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
465 p->family);
466 }
467
468 out:
469 if (!x && errp)
470 *errp = err;
471 return x;
472 }
473
474 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
475 struct nlattr **attrs)
476 {
477 struct xfrm_state *x;
478 int err = -ESRCH;
479 struct km_event c;
480 struct xfrm_usersa_id *p = nlmsg_data(nlh);
481
482 x = xfrm_user_state_lookup(p, attrs, &err);
483 if (x == NULL)
484 return err;
485
486 if ((err = security_xfrm_state_delete(x)) != 0)
487 goto out;
488
489 if (xfrm_state_kern(x)) {
490 err = -EPERM;
491 goto out;
492 }
493
494 err = xfrm_state_delete(x);
495
496 if (err < 0)
497 goto out;
498
499 c.seq = nlh->nlmsg_seq;
500 c.pid = nlh->nlmsg_pid;
501 c.event = nlh->nlmsg_type;
502 km_state_notify(x, &c);
503
504 out:
505 xfrm_audit_state_delete(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
506 NETLINK_CB(skb).sid);
507 xfrm_state_put(x);
508 return err;
509 }
510
511 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
512 {
513 memcpy(&p->id, &x->id, sizeof(p->id));
514 memcpy(&p->sel, &x->sel, sizeof(p->sel));
515 memcpy(&p->lft, &x->lft, sizeof(p->lft));
516 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
517 memcpy(&p->stats, &x->stats, sizeof(p->stats));
518 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
519 p->mode = x->props.mode;
520 p->replay_window = x->props.replay_window;
521 p->reqid = x->props.reqid;
522 p->family = x->props.family;
523 p->flags = x->props.flags;
524 p->seq = x->km.seq;
525 }
526
527 struct xfrm_dump_info {
528 struct sk_buff *in_skb;
529 struct sk_buff *out_skb;
530 u32 nlmsg_seq;
531 u16 nlmsg_flags;
532 };
533
534 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
535 {
536 struct xfrm_user_sec_ctx *uctx;
537 struct nlattr *attr;
538 int ctx_size = sizeof(*uctx) + s->ctx_len;
539
540 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
541 if (attr == NULL)
542 return -EMSGSIZE;
543
544 uctx = nla_data(attr);
545 uctx->exttype = XFRMA_SEC_CTX;
546 uctx->len = ctx_size;
547 uctx->ctx_doi = s->ctx_doi;
548 uctx->ctx_alg = s->ctx_alg;
549 uctx->ctx_len = s->ctx_len;
550 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
551
552 return 0;
553 }
554
555 /* Don't change this without updating xfrm_sa_len! */
556 static int copy_to_user_state_extra(struct xfrm_state *x,
557 struct xfrm_usersa_info *p,
558 struct sk_buff *skb)
559 {
560 copy_to_user_state(x, p);
561
562 if (x->coaddr)
563 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
564
565 if (x->lastused)
566 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
567
568 if (x->aead)
569 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
570 if (x->aalg)
571 NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
572 if (x->ealg)
573 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
574 if (x->calg)
575 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
576
577 if (x->encap)
578 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
579
580 if (x->security && copy_sec_ctx(x->security, skb) < 0)
581 goto nla_put_failure;
582
583 return 0;
584
585 nla_put_failure:
586 return -EMSGSIZE;
587 }
588
589 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
590 {
591 struct xfrm_dump_info *sp = ptr;
592 struct sk_buff *in_skb = sp->in_skb;
593 struct sk_buff *skb = sp->out_skb;
594 struct xfrm_usersa_info *p;
595 struct nlmsghdr *nlh;
596 int err;
597
598 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
599 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
600 if (nlh == NULL)
601 return -EMSGSIZE;
602
603 p = nlmsg_data(nlh);
604
605 err = copy_to_user_state_extra(x, p, skb);
606 if (err)
607 goto nla_put_failure;
608
609 nlmsg_end(skb, nlh);
610 return 0;
611
612 nla_put_failure:
613 nlmsg_cancel(skb, nlh);
614 return err;
615 }
616
617 static int xfrm_dump_sa_done(struct netlink_callback *cb)
618 {
619 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
620 xfrm_state_walk_done(walk);
621 return 0;
622 }
623
624 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
625 {
626 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
627 struct xfrm_dump_info info;
628
629 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
630 sizeof(cb->args) - sizeof(cb->args[0]));
631
632 info.in_skb = cb->skb;
633 info.out_skb = skb;
634 info.nlmsg_seq = cb->nlh->nlmsg_seq;
635 info.nlmsg_flags = NLM_F_MULTI;
636
637 if (!cb->args[0]) {
638 cb->args[0] = 1;
639 xfrm_state_walk_init(walk, 0);
640 }
641
642 (void) xfrm_state_walk(walk, dump_one_state, &info);
643
644 return skb->len;
645 }
646
647 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
648 struct xfrm_state *x, u32 seq)
649 {
650 struct xfrm_dump_info info;
651 struct sk_buff *skb;
652
653 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
654 if (!skb)
655 return ERR_PTR(-ENOMEM);
656
657 info.in_skb = in_skb;
658 info.out_skb = skb;
659 info.nlmsg_seq = seq;
660 info.nlmsg_flags = 0;
661
662 if (dump_one_state(x, 0, &info)) {
663 kfree_skb(skb);
664 return NULL;
665 }
666
667 return skb;
668 }
669
670 static inline size_t xfrm_spdinfo_msgsize(void)
671 {
672 return NLMSG_ALIGN(4)
673 + nla_total_size(sizeof(struct xfrmu_spdinfo))
674 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
675 }
676
677 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
678 {
679 struct xfrmk_spdinfo si;
680 struct xfrmu_spdinfo spc;
681 struct xfrmu_spdhinfo sph;
682 struct nlmsghdr *nlh;
683 u32 *f;
684
685 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
686 if (nlh == NULL) /* shouldnt really happen ... */
687 return -EMSGSIZE;
688
689 f = nlmsg_data(nlh);
690 *f = flags;
691 xfrm_spd_getinfo(&si);
692 spc.incnt = si.incnt;
693 spc.outcnt = si.outcnt;
694 spc.fwdcnt = si.fwdcnt;
695 spc.inscnt = si.inscnt;
696 spc.outscnt = si.outscnt;
697 spc.fwdscnt = si.fwdscnt;
698 sph.spdhcnt = si.spdhcnt;
699 sph.spdhmcnt = si.spdhmcnt;
700
701 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
702 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
703
704 return nlmsg_end(skb, nlh);
705
706 nla_put_failure:
707 nlmsg_cancel(skb, nlh);
708 return -EMSGSIZE;
709 }
710
711 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
712 struct nlattr **attrs)
713 {
714 struct sk_buff *r_skb;
715 u32 *flags = nlmsg_data(nlh);
716 u32 spid = NETLINK_CB(skb).pid;
717 u32 seq = nlh->nlmsg_seq;
718
719 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
720 if (r_skb == NULL)
721 return -ENOMEM;
722
723 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
724 BUG();
725
726 return nlmsg_unicast(xfrm_nl, r_skb, spid);
727 }
728
729 static inline size_t xfrm_sadinfo_msgsize(void)
730 {
731 return NLMSG_ALIGN(4)
732 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
733 + nla_total_size(4); /* XFRMA_SAD_CNT */
734 }
735
736 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
737 {
738 struct xfrmk_sadinfo si;
739 struct xfrmu_sadhinfo sh;
740 struct nlmsghdr *nlh;
741 u32 *f;
742
743 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
744 if (nlh == NULL) /* shouldnt really happen ... */
745 return -EMSGSIZE;
746
747 f = nlmsg_data(nlh);
748 *f = flags;
749 xfrm_sad_getinfo(&si);
750
751 sh.sadhmcnt = si.sadhmcnt;
752 sh.sadhcnt = si.sadhcnt;
753
754 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
755 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
756
757 return nlmsg_end(skb, nlh);
758
759 nla_put_failure:
760 nlmsg_cancel(skb, nlh);
761 return -EMSGSIZE;
762 }
763
764 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
765 struct nlattr **attrs)
766 {
767 struct sk_buff *r_skb;
768 u32 *flags = nlmsg_data(nlh);
769 u32 spid = NETLINK_CB(skb).pid;
770 u32 seq = nlh->nlmsg_seq;
771
772 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
773 if (r_skb == NULL)
774 return -ENOMEM;
775
776 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
777 BUG();
778
779 return nlmsg_unicast(xfrm_nl, r_skb, spid);
780 }
781
782 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
783 struct nlattr **attrs)
784 {
785 struct xfrm_usersa_id *p = nlmsg_data(nlh);
786 struct xfrm_state *x;
787 struct sk_buff *resp_skb;
788 int err = -ESRCH;
789
790 x = xfrm_user_state_lookup(p, attrs, &err);
791 if (x == NULL)
792 goto out_noput;
793
794 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
795 if (IS_ERR(resp_skb)) {
796 err = PTR_ERR(resp_skb);
797 } else {
798 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
799 }
800 xfrm_state_put(x);
801 out_noput:
802 return err;
803 }
804
805 static int verify_userspi_info(struct xfrm_userspi_info *p)
806 {
807 switch (p->info.id.proto) {
808 case IPPROTO_AH:
809 case IPPROTO_ESP:
810 break;
811
812 case IPPROTO_COMP:
813 /* IPCOMP spi is 16-bits. */
814 if (p->max >= 0x10000)
815 return -EINVAL;
816 break;
817
818 default:
819 return -EINVAL;
820 }
821
822 if (p->min > p->max)
823 return -EINVAL;
824
825 return 0;
826 }
827
828 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
829 struct nlattr **attrs)
830 {
831 struct xfrm_state *x;
832 struct xfrm_userspi_info *p;
833 struct sk_buff *resp_skb;
834 xfrm_address_t *daddr;
835 int family;
836 int err;
837
838 p = nlmsg_data(nlh);
839 err = verify_userspi_info(p);
840 if (err)
841 goto out_noput;
842
843 family = p->info.family;
844 daddr = &p->info.id.daddr;
845
846 x = NULL;
847 if (p->info.seq) {
848 x = xfrm_find_acq_byseq(p->info.seq);
849 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
850 xfrm_state_put(x);
851 x = NULL;
852 }
853 }
854
855 if (!x)
856 x = xfrm_find_acq(p->info.mode, p->info.reqid,
857 p->info.id.proto, daddr,
858 &p->info.saddr, 1,
859 family);
860 err = -ENOENT;
861 if (x == NULL)
862 goto out_noput;
863
864 err = xfrm_alloc_spi(x, p->min, p->max);
865 if (err)
866 goto out;
867
868 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
869 if (IS_ERR(resp_skb)) {
870 err = PTR_ERR(resp_skb);
871 goto out;
872 }
873
874 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
875
876 out:
877 xfrm_state_put(x);
878 out_noput:
879 return err;
880 }
881
882 static int verify_policy_dir(u8 dir)
883 {
884 switch (dir) {
885 case XFRM_POLICY_IN:
886 case XFRM_POLICY_OUT:
887 case XFRM_POLICY_FWD:
888 break;
889
890 default:
891 return -EINVAL;
892 }
893
894 return 0;
895 }
896
897 static int verify_policy_type(u8 type)
898 {
899 switch (type) {
900 case XFRM_POLICY_TYPE_MAIN:
901 #ifdef CONFIG_XFRM_SUB_POLICY
902 case XFRM_POLICY_TYPE_SUB:
903 #endif
904 break;
905
906 default:
907 return -EINVAL;
908 }
909
910 return 0;
911 }
912
913 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
914 {
915 switch (p->share) {
916 case XFRM_SHARE_ANY:
917 case XFRM_SHARE_SESSION:
918 case XFRM_SHARE_USER:
919 case XFRM_SHARE_UNIQUE:
920 break;
921
922 default:
923 return -EINVAL;
924 }
925
926 switch (p->action) {
927 case XFRM_POLICY_ALLOW:
928 case XFRM_POLICY_BLOCK:
929 break;
930
931 default:
932 return -EINVAL;
933 }
934
935 switch (p->sel.family) {
936 case AF_INET:
937 break;
938
939 case AF_INET6:
940 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
941 break;
942 #else
943 return -EAFNOSUPPORT;
944 #endif
945
946 default:
947 return -EINVAL;
948 }
949
950 return verify_policy_dir(p->dir);
951 }
952
953 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
954 {
955 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
956 struct xfrm_user_sec_ctx *uctx;
957
958 if (!rt)
959 return 0;
960
961 uctx = nla_data(rt);
962 return security_xfrm_policy_alloc(pol, uctx);
963 }
964
965 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
966 int nr)
967 {
968 int i;
969
970 xp->xfrm_nr = nr;
971 for (i = 0; i < nr; i++, ut++) {
972 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
973
974 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
975 memcpy(&t->saddr, &ut->saddr,
976 sizeof(xfrm_address_t));
977 t->reqid = ut->reqid;
978 t->mode = ut->mode;
979 t->share = ut->share;
980 t->optional = ut->optional;
981 t->aalgos = ut->aalgos;
982 t->ealgos = ut->ealgos;
983 t->calgos = ut->calgos;
984 t->encap_family = ut->family;
985 }
986 }
987
988 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
989 {
990 int i;
991
992 if (nr > XFRM_MAX_DEPTH)
993 return -EINVAL;
994
995 for (i = 0; i < nr; i++) {
996 /* We never validated the ut->family value, so many
997 * applications simply leave it at zero. The check was
998 * never made and ut->family was ignored because all
999 * templates could be assumed to have the same family as
1000 * the policy itself. Now that we will have ipv4-in-ipv6
1001 * and ipv6-in-ipv4 tunnels, this is no longer true.
1002 */
1003 if (!ut[i].family)
1004 ut[i].family = family;
1005
1006 switch (ut[i].family) {
1007 case AF_INET:
1008 break;
1009 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1010 case AF_INET6:
1011 break;
1012 #endif
1013 default:
1014 return -EINVAL;
1015 }
1016 }
1017
1018 return 0;
1019 }
1020
1021 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1022 {
1023 struct nlattr *rt = attrs[XFRMA_TMPL];
1024
1025 if (!rt) {
1026 pol->xfrm_nr = 0;
1027 } else {
1028 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1029 int nr = nla_len(rt) / sizeof(*utmpl);
1030 int err;
1031
1032 err = validate_tmpl(nr, utmpl, pol->family);
1033 if (err)
1034 return err;
1035
1036 copy_templates(pol, utmpl, nr);
1037 }
1038 return 0;
1039 }
1040
1041 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1042 {
1043 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1044 struct xfrm_userpolicy_type *upt;
1045 u8 type = XFRM_POLICY_TYPE_MAIN;
1046 int err;
1047
1048 if (rt) {
1049 upt = nla_data(rt);
1050 type = upt->type;
1051 }
1052
1053 err = verify_policy_type(type);
1054 if (err)
1055 return err;
1056
1057 *tp = type;
1058 return 0;
1059 }
1060
1061 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1062 {
1063 xp->priority = p->priority;
1064 xp->index = p->index;
1065 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1066 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1067 xp->action = p->action;
1068 xp->flags = p->flags;
1069 xp->family = p->sel.family;
1070 /* XXX xp->share = p->share; */
1071 }
1072
1073 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1074 {
1075 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1076 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1077 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1078 p->priority = xp->priority;
1079 p->index = xp->index;
1080 p->sel.family = xp->family;
1081 p->dir = dir;
1082 p->action = xp->action;
1083 p->flags = xp->flags;
1084 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1085 }
1086
1087 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1088 {
1089 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1090 int err;
1091
1092 if (!xp) {
1093 *errp = -ENOMEM;
1094 return NULL;
1095 }
1096
1097 copy_from_user_policy(xp, p);
1098
1099 err = copy_from_user_policy_type(&xp->type, attrs);
1100 if (err)
1101 goto error;
1102
1103 if (!(err = copy_from_user_tmpl(xp, attrs)))
1104 err = copy_from_user_sec_ctx(xp, attrs);
1105 if (err)
1106 goto error;
1107
1108 return xp;
1109 error:
1110 *errp = err;
1111 xp->dead = 1;
1112 xfrm_policy_destroy(xp);
1113 return NULL;
1114 }
1115
1116 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1117 struct nlattr **attrs)
1118 {
1119 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1120 struct xfrm_policy *xp;
1121 struct km_event c;
1122 int err;
1123 int excl;
1124
1125 err = verify_newpolicy_info(p);
1126 if (err)
1127 return err;
1128 err = verify_sec_ctx_len(attrs);
1129 if (err)
1130 return err;
1131
1132 xp = xfrm_policy_construct(p, attrs, &err);
1133 if (!xp)
1134 return err;
1135
1136 /* shouldnt excl be based on nlh flags??
1137 * Aha! this is anti-netlink really i.e more pfkey derived
1138 * in netlink excl is a flag and you wouldnt need
1139 * a type XFRM_MSG_UPDPOLICY - JHS */
1140 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1141 err = xfrm_policy_insert(p->dir, xp, excl);
1142 xfrm_audit_policy_add(xp, err ? 0 : 1, NETLINK_CB(skb).loginuid,
1143 NETLINK_CB(skb).sid);
1144
1145 if (err) {
1146 security_xfrm_policy_free(xp);
1147 kfree(xp);
1148 return err;
1149 }
1150
1151 c.event = nlh->nlmsg_type;
1152 c.seq = nlh->nlmsg_seq;
1153 c.pid = nlh->nlmsg_pid;
1154 km_policy_notify(xp, p->dir, &c);
1155
1156 xfrm_pol_put(xp);
1157
1158 return 0;
1159 }
1160
1161 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1162 {
1163 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1164 int i;
1165
1166 if (xp->xfrm_nr == 0)
1167 return 0;
1168
1169 for (i = 0; i < xp->xfrm_nr; i++) {
1170 struct xfrm_user_tmpl *up = &vec[i];
1171 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1172
1173 memcpy(&up->id, &kp->id, sizeof(up->id));
1174 up->family = kp->encap_family;
1175 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1176 up->reqid = kp->reqid;
1177 up->mode = kp->mode;
1178 up->share = kp->share;
1179 up->optional = kp->optional;
1180 up->aalgos = kp->aalgos;
1181 up->ealgos = kp->ealgos;
1182 up->calgos = kp->calgos;
1183 }
1184
1185 return nla_put(skb, XFRMA_TMPL,
1186 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1187 }
1188
1189 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1190 {
1191 if (x->security) {
1192 return copy_sec_ctx(x->security, skb);
1193 }
1194 return 0;
1195 }
1196
1197 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1198 {
1199 if (xp->security) {
1200 return copy_sec_ctx(xp->security, skb);
1201 }
1202 return 0;
1203 }
1204 static inline size_t userpolicy_type_attrsize(void)
1205 {
1206 #ifdef CONFIG_XFRM_SUB_POLICY
1207 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1208 #else
1209 return 0;
1210 #endif
1211 }
1212
1213 #ifdef CONFIG_XFRM_SUB_POLICY
1214 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1215 {
1216 struct xfrm_userpolicy_type upt = {
1217 .type = type,
1218 };
1219
1220 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1221 }
1222
1223 #else
1224 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1225 {
1226 return 0;
1227 }
1228 #endif
1229
1230 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1231 {
1232 struct xfrm_dump_info *sp = ptr;
1233 struct xfrm_userpolicy_info *p;
1234 struct sk_buff *in_skb = sp->in_skb;
1235 struct sk_buff *skb = sp->out_skb;
1236 struct nlmsghdr *nlh;
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 return 0;
1254
1255 nlmsg_failure:
1256 nlmsg_cancel(skb, nlh);
1257 return -EMSGSIZE;
1258 }
1259
1260 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1261 {
1262 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1263
1264 xfrm_policy_walk_done(walk);
1265 return 0;
1266 }
1267
1268 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1269 {
1270 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1271 struct xfrm_dump_info info;
1272
1273 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1274 sizeof(cb->args) - sizeof(cb->args[0]));
1275
1276 info.in_skb = cb->skb;
1277 info.out_skb = skb;
1278 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1279 info.nlmsg_flags = NLM_F_MULTI;
1280
1281 if (!cb->args[0]) {
1282 cb->args[0] = 1;
1283 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1284 }
1285
1286 (void) xfrm_policy_walk(walk, dump_one_policy, &info);
1287
1288 return skb->len;
1289 }
1290
1291 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1292 struct xfrm_policy *xp,
1293 int dir, u32 seq)
1294 {
1295 struct xfrm_dump_info info;
1296 struct sk_buff *skb;
1297
1298 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1299 if (!skb)
1300 return ERR_PTR(-ENOMEM);
1301
1302 info.in_skb = in_skb;
1303 info.out_skb = skb;
1304 info.nlmsg_seq = seq;
1305 info.nlmsg_flags = 0;
1306
1307 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1308 kfree_skb(skb);
1309 return NULL;
1310 }
1311
1312 return skb;
1313 }
1314
1315 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1316 struct nlattr **attrs)
1317 {
1318 struct xfrm_policy *xp;
1319 struct xfrm_userpolicy_id *p;
1320 u8 type = XFRM_POLICY_TYPE_MAIN;
1321 int err;
1322 struct km_event c;
1323 int delete;
1324
1325 p = nlmsg_data(nlh);
1326 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1327
1328 err = copy_from_user_policy_type(&type, attrs);
1329 if (err)
1330 return err;
1331
1332 err = verify_policy_dir(p->dir);
1333 if (err)
1334 return err;
1335
1336 if (p->index)
1337 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1338 else {
1339 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1340 struct xfrm_policy tmp;
1341
1342 err = verify_sec_ctx_len(attrs);
1343 if (err)
1344 return err;
1345
1346 memset(&tmp, 0, sizeof(struct xfrm_policy));
1347 if (rt) {
1348 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1349
1350 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1351 return err;
1352 }
1353 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1354 delete, &err);
1355 security_xfrm_policy_free(&tmp);
1356 }
1357 if (xp == NULL)
1358 return -ENOENT;
1359
1360 if (!delete) {
1361 struct sk_buff *resp_skb;
1362
1363 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1364 if (IS_ERR(resp_skb)) {
1365 err = PTR_ERR(resp_skb);
1366 } else {
1367 err = nlmsg_unicast(xfrm_nl, resp_skb,
1368 NETLINK_CB(skb).pid);
1369 }
1370 } else {
1371 xfrm_audit_policy_delete(xp, err ? 0 : 1,
1372 NETLINK_CB(skb).loginuid,
1373 NETLINK_CB(skb).sid);
1374
1375 if (err != 0)
1376 goto out;
1377
1378 c.data.byid = p->index;
1379 c.event = nlh->nlmsg_type;
1380 c.seq = nlh->nlmsg_seq;
1381 c.pid = nlh->nlmsg_pid;
1382 km_policy_notify(xp, p->dir, &c);
1383 }
1384
1385 out:
1386 xfrm_pol_put(xp);
1387 return err;
1388 }
1389
1390 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1391 struct nlattr **attrs)
1392 {
1393 struct km_event c;
1394 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1395 struct xfrm_audit audit_info;
1396 int err;
1397
1398 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1399 audit_info.secid = NETLINK_CB(skb).sid;
1400 err = xfrm_state_flush(p->proto, &audit_info);
1401 if (err)
1402 return err;
1403 c.data.proto = p->proto;
1404 c.event = nlh->nlmsg_type;
1405 c.seq = nlh->nlmsg_seq;
1406 c.pid = nlh->nlmsg_pid;
1407 km_state_notify(NULL, &c);
1408
1409 return 0;
1410 }
1411
1412 static inline size_t xfrm_aevent_msgsize(void)
1413 {
1414 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1415 + nla_total_size(sizeof(struct xfrm_replay_state))
1416 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1417 + nla_total_size(4) /* XFRM_AE_RTHR */
1418 + nla_total_size(4); /* XFRM_AE_ETHR */
1419 }
1420
1421 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1422 {
1423 struct xfrm_aevent_id *id;
1424 struct nlmsghdr *nlh;
1425
1426 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1427 if (nlh == NULL)
1428 return -EMSGSIZE;
1429
1430 id = nlmsg_data(nlh);
1431 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1432 id->sa_id.spi = x->id.spi;
1433 id->sa_id.family = x->props.family;
1434 id->sa_id.proto = x->id.proto;
1435 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1436 id->reqid = x->props.reqid;
1437 id->flags = c->data.aevent;
1438
1439 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1440 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1441
1442 if (id->flags & XFRM_AE_RTHR)
1443 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1444
1445 if (id->flags & XFRM_AE_ETHR)
1446 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1447 x->replay_maxage * 10 / HZ);
1448
1449 return nlmsg_end(skb, nlh);
1450
1451 nla_put_failure:
1452 nlmsg_cancel(skb, nlh);
1453 return -EMSGSIZE;
1454 }
1455
1456 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1457 struct nlattr **attrs)
1458 {
1459 struct xfrm_state *x;
1460 struct sk_buff *r_skb;
1461 int err;
1462 struct km_event c;
1463 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1464 struct xfrm_usersa_id *id = &p->sa_id;
1465
1466 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1467 if (r_skb == NULL)
1468 return -ENOMEM;
1469
1470 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1471 if (x == NULL) {
1472 kfree_skb(r_skb);
1473 return -ESRCH;
1474 }
1475
1476 /*
1477 * XXX: is this lock really needed - none of the other
1478 * gets lock (the concern is things getting updated
1479 * while we are still reading) - jhs
1480 */
1481 spin_lock_bh(&x->lock);
1482 c.data.aevent = p->flags;
1483 c.seq = nlh->nlmsg_seq;
1484 c.pid = nlh->nlmsg_pid;
1485
1486 if (build_aevent(r_skb, x, &c) < 0)
1487 BUG();
1488 err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
1489 spin_unlock_bh(&x->lock);
1490 xfrm_state_put(x);
1491 return err;
1492 }
1493
1494 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1495 struct nlattr **attrs)
1496 {
1497 struct xfrm_state *x;
1498 struct km_event c;
1499 int err = - EINVAL;
1500 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1501 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1502 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1503
1504 if (!lt && !rp)
1505 return err;
1506
1507 /* pedantic mode - thou shalt sayeth replaceth */
1508 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1509 return err;
1510
1511 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1512 if (x == NULL)
1513 return -ESRCH;
1514
1515 if (x->km.state != XFRM_STATE_VALID)
1516 goto out;
1517
1518 spin_lock_bh(&x->lock);
1519 xfrm_update_ae_params(x, attrs);
1520 spin_unlock_bh(&x->lock);
1521
1522 c.event = nlh->nlmsg_type;
1523 c.seq = nlh->nlmsg_seq;
1524 c.pid = nlh->nlmsg_pid;
1525 c.data.aevent = XFRM_AE_CU;
1526 km_state_notify(x, &c);
1527 err = 0;
1528 out:
1529 xfrm_state_put(x);
1530 return err;
1531 }
1532
1533 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1534 struct nlattr **attrs)
1535 {
1536 struct km_event c;
1537 u8 type = XFRM_POLICY_TYPE_MAIN;
1538 int err;
1539 struct xfrm_audit audit_info;
1540
1541 err = copy_from_user_policy_type(&type, attrs);
1542 if (err)
1543 return err;
1544
1545 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1546 audit_info.secid = NETLINK_CB(skb).sid;
1547 err = xfrm_policy_flush(type, &audit_info);
1548 if (err)
1549 return err;
1550 c.data.type = type;
1551 c.event = nlh->nlmsg_type;
1552 c.seq = nlh->nlmsg_seq;
1553 c.pid = nlh->nlmsg_pid;
1554 km_policy_notify(NULL, 0, &c);
1555 return 0;
1556 }
1557
1558 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1559 struct nlattr **attrs)
1560 {
1561 struct xfrm_policy *xp;
1562 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1563 struct xfrm_userpolicy_info *p = &up->pol;
1564 u8 type = XFRM_POLICY_TYPE_MAIN;
1565 int err = -ENOENT;
1566
1567 err = copy_from_user_policy_type(&type, attrs);
1568 if (err)
1569 return err;
1570
1571 if (p->index)
1572 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1573 else {
1574 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1575 struct xfrm_policy tmp;
1576
1577 err = verify_sec_ctx_len(attrs);
1578 if (err)
1579 return err;
1580
1581 memset(&tmp, 0, sizeof(struct xfrm_policy));
1582 if (rt) {
1583 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1584
1585 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1586 return err;
1587 }
1588 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1589 0, &err);
1590 security_xfrm_policy_free(&tmp);
1591 }
1592
1593 if (xp == NULL)
1594 return -ENOENT;
1595 read_lock(&xp->lock);
1596 if (xp->dead) {
1597 read_unlock(&xp->lock);
1598 goto out;
1599 }
1600
1601 read_unlock(&xp->lock);
1602 err = 0;
1603 if (up->hard) {
1604 xfrm_policy_delete(xp, p->dir);
1605 xfrm_audit_policy_delete(xp, 1, NETLINK_CB(skb).loginuid,
1606 NETLINK_CB(skb).sid);
1607
1608 } else {
1609 // reset the timers here?
1610 printk("Dont know what to do with soft policy expire\n");
1611 }
1612 km_policy_expired(xp, p->dir, up->hard, current->pid);
1613
1614 out:
1615 xfrm_pol_put(xp);
1616 return err;
1617 }
1618
1619 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1620 struct nlattr **attrs)
1621 {
1622 struct xfrm_state *x;
1623 int err;
1624 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1625 struct xfrm_usersa_info *p = &ue->state;
1626
1627 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1628
1629 err = -ENOENT;
1630 if (x == NULL)
1631 return err;
1632
1633 spin_lock_bh(&x->lock);
1634 err = -EINVAL;
1635 if (x->km.state != XFRM_STATE_VALID)
1636 goto out;
1637 km_state_expired(x, ue->hard, current->pid);
1638
1639 if (ue->hard) {
1640 __xfrm_state_delete(x);
1641 xfrm_audit_state_delete(x, 1, NETLINK_CB(skb).loginuid,
1642 NETLINK_CB(skb).sid);
1643 }
1644 err = 0;
1645 out:
1646 spin_unlock_bh(&x->lock);
1647 xfrm_state_put(x);
1648 return err;
1649 }
1650
1651 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1652 struct nlattr **attrs)
1653 {
1654 struct xfrm_policy *xp;
1655 struct xfrm_user_tmpl *ut;
1656 int i;
1657 struct nlattr *rt = attrs[XFRMA_TMPL];
1658
1659 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1660 struct xfrm_state *x = xfrm_state_alloc();
1661 int err = -ENOMEM;
1662
1663 if (!x)
1664 return err;
1665
1666 err = verify_newpolicy_info(&ua->policy);
1667 if (err) {
1668 printk("BAD policy passed\n");
1669 kfree(x);
1670 return err;
1671 }
1672
1673 /* build an XP */
1674 xp = xfrm_policy_construct(&ua->policy, attrs, &err);
1675 if (!xp) {
1676 kfree(x);
1677 return err;
1678 }
1679
1680 memcpy(&x->id, &ua->id, sizeof(ua->id));
1681 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1682 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1683
1684 ut = nla_data(rt);
1685 /* extract the templates and for each call km_key */
1686 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1687 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1688 memcpy(&x->id, &t->id, sizeof(x->id));
1689 x->props.mode = t->mode;
1690 x->props.reqid = t->reqid;
1691 x->props.family = ut->family;
1692 t->aalgos = ua->aalgos;
1693 t->ealgos = ua->ealgos;
1694 t->calgos = ua->calgos;
1695 err = km_query(x, t, xp);
1696
1697 }
1698
1699 kfree(x);
1700 kfree(xp);
1701
1702 return 0;
1703 }
1704
1705 #ifdef CONFIG_XFRM_MIGRATE
1706 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1707 struct nlattr **attrs, int *num)
1708 {
1709 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1710 struct xfrm_user_migrate *um;
1711 int i, num_migrate;
1712
1713 um = nla_data(rt);
1714 num_migrate = nla_len(rt) / sizeof(*um);
1715
1716 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1717 return -EINVAL;
1718
1719 for (i = 0; i < num_migrate; i++, um++, ma++) {
1720 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1721 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1722 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1723 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1724
1725 ma->proto = um->proto;
1726 ma->mode = um->mode;
1727 ma->reqid = um->reqid;
1728
1729 ma->old_family = um->old_family;
1730 ma->new_family = um->new_family;
1731 }
1732
1733 *num = i;
1734 return 0;
1735 }
1736
1737 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1738 struct nlattr **attrs)
1739 {
1740 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1741 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1742 u8 type;
1743 int err;
1744 int n = 0;
1745
1746 if (attrs[XFRMA_MIGRATE] == NULL)
1747 return -EINVAL;
1748
1749 err = copy_from_user_policy_type(&type, attrs);
1750 if (err)
1751 return err;
1752
1753 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1754 attrs, &n);
1755 if (err)
1756 return err;
1757
1758 if (!n)
1759 return 0;
1760
1761 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1762
1763 return 0;
1764 }
1765 #else
1766 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1767 struct nlattr **attrs)
1768 {
1769 return -ENOPROTOOPT;
1770 }
1771 #endif
1772
1773 #ifdef CONFIG_XFRM_MIGRATE
1774 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1775 {
1776 struct xfrm_user_migrate um;
1777
1778 memset(&um, 0, sizeof(um));
1779 um.proto = m->proto;
1780 um.mode = m->mode;
1781 um.reqid = m->reqid;
1782 um.old_family = m->old_family;
1783 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1784 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1785 um.new_family = m->new_family;
1786 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1787 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1788
1789 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1790 }
1791
1792 static inline size_t xfrm_migrate_msgsize(int num_migrate)
1793 {
1794 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1795 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1796 + userpolicy_type_attrsize();
1797 }
1798
1799 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1800 int num_migrate, struct xfrm_selector *sel,
1801 u8 dir, u8 type)
1802 {
1803 struct xfrm_migrate *mp;
1804 struct xfrm_userpolicy_id *pol_id;
1805 struct nlmsghdr *nlh;
1806 int i;
1807
1808 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1809 if (nlh == NULL)
1810 return -EMSGSIZE;
1811
1812 pol_id = nlmsg_data(nlh);
1813 /* copy data from selector, dir, and type to the pol_id */
1814 memset(pol_id, 0, sizeof(*pol_id));
1815 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1816 pol_id->dir = dir;
1817
1818 if (copy_to_user_policy_type(type, skb) < 0)
1819 goto nlmsg_failure;
1820
1821 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1822 if (copy_to_user_migrate(mp, skb) < 0)
1823 goto nlmsg_failure;
1824 }
1825
1826 return nlmsg_end(skb, nlh);
1827 nlmsg_failure:
1828 nlmsg_cancel(skb, nlh);
1829 return -EMSGSIZE;
1830 }
1831
1832 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1833 struct xfrm_migrate *m, int num_migrate)
1834 {
1835 struct sk_buff *skb;
1836
1837 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
1838 if (skb == NULL)
1839 return -ENOMEM;
1840
1841 /* build migrate */
1842 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1843 BUG();
1844
1845 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
1846 }
1847 #else
1848 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1849 struct xfrm_migrate *m, int num_migrate)
1850 {
1851 return -ENOPROTOOPT;
1852 }
1853 #endif
1854
1855 #define XMSGSIZE(type) sizeof(struct type)
1856
1857 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1858 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1859 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1860 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1861 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1862 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1863 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1864 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1865 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1866 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1867 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1868 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1869 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1870 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1871 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
1872 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1873 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1874 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1875 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1876 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
1877 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1878 };
1879
1880 #undef XMSGSIZE
1881
1882 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1883 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
1884 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
1885 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
1886 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
1887 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
1888 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
1889 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
1890 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
1891 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
1892 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
1893 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
1894 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
1895 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
1896 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
1897 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
1898 };
1899
1900 static struct xfrm_link {
1901 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1902 int (*dump)(struct sk_buff *, struct netlink_callback *);
1903 int (*done)(struct netlink_callback *);
1904 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1905 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1906 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1907 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1908 .dump = xfrm_dump_sa,
1909 .done = xfrm_dump_sa_done },
1910 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1911 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1912 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1913 .dump = xfrm_dump_policy,
1914 .done = xfrm_dump_policy_done },
1915 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1916 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1917 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1918 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1919 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1920 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1921 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1922 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1923 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1924 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1925 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1926 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1927 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1928 };
1929
1930 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1931 {
1932 struct nlattr *attrs[XFRMA_MAX+1];
1933 struct xfrm_link *link;
1934 int type, err;
1935
1936 type = nlh->nlmsg_type;
1937 if (type > XFRM_MSG_MAX)
1938 return -EINVAL;
1939
1940 type -= XFRM_MSG_BASE;
1941 link = &xfrm_dispatch[type];
1942
1943 /* All operations require privileges, even GET */
1944 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1945 return -EPERM;
1946
1947 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1948 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1949 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1950 if (link->dump == NULL)
1951 return -EINVAL;
1952
1953 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, link->done);
1954 }
1955
1956 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
1957 xfrma_policy);
1958 if (err < 0)
1959 return err;
1960
1961 if (link->doit == NULL)
1962 return -EINVAL;
1963
1964 return link->doit(skb, nlh, attrs);
1965 }
1966
1967 static void xfrm_netlink_rcv(struct sk_buff *skb)
1968 {
1969 mutex_lock(&xfrm_cfg_mutex);
1970 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
1971 mutex_unlock(&xfrm_cfg_mutex);
1972 }
1973
1974 static inline size_t xfrm_expire_msgsize(void)
1975 {
1976 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
1977 }
1978
1979 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1980 {
1981 struct xfrm_user_expire *ue;
1982 struct nlmsghdr *nlh;
1983
1984 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
1985 if (nlh == NULL)
1986 return -EMSGSIZE;
1987
1988 ue = nlmsg_data(nlh);
1989 copy_to_user_state(x, &ue->state);
1990 ue->hard = (c->data.hard != 0) ? 1 : 0;
1991
1992 return nlmsg_end(skb, nlh);
1993 }
1994
1995 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1996 {
1997 struct sk_buff *skb;
1998
1999 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2000 if (skb == NULL)
2001 return -ENOMEM;
2002
2003 if (build_expire(skb, x, c) < 0)
2004 BUG();
2005
2006 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2007 }
2008
2009 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2010 {
2011 struct sk_buff *skb;
2012
2013 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2014 if (skb == NULL)
2015 return -ENOMEM;
2016
2017 if (build_aevent(skb, x, c) < 0)
2018 BUG();
2019
2020 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2021 }
2022
2023 static int xfrm_notify_sa_flush(struct km_event *c)
2024 {
2025 struct xfrm_usersa_flush *p;
2026 struct nlmsghdr *nlh;
2027 struct sk_buff *skb;
2028 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2029
2030 skb = nlmsg_new(len, GFP_ATOMIC);
2031 if (skb == NULL)
2032 return -ENOMEM;
2033
2034 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2035 if (nlh == NULL) {
2036 kfree_skb(skb);
2037 return -EMSGSIZE;
2038 }
2039
2040 p = nlmsg_data(nlh);
2041 p->proto = c->data.proto;
2042
2043 nlmsg_end(skb, nlh);
2044
2045 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2046 }
2047
2048 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2049 {
2050 size_t l = 0;
2051 if (x->aead)
2052 l += nla_total_size(aead_len(x->aead));
2053 if (x->aalg)
2054 l += nla_total_size(xfrm_alg_len(x->aalg));
2055 if (x->ealg)
2056 l += nla_total_size(xfrm_alg_len(x->ealg));
2057 if (x->calg)
2058 l += nla_total_size(sizeof(*x->calg));
2059 if (x->encap)
2060 l += nla_total_size(sizeof(*x->encap));
2061 if (x->security)
2062 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2063 x->security->ctx_len);
2064 if (x->coaddr)
2065 l += nla_total_size(sizeof(*x->coaddr));
2066
2067 /* Must count x->lastused as it may become non-zero behind our back. */
2068 l += nla_total_size(sizeof(u64));
2069
2070 return l;
2071 }
2072
2073 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2074 {
2075 struct xfrm_usersa_info *p;
2076 struct xfrm_usersa_id *id;
2077 struct nlmsghdr *nlh;
2078 struct sk_buff *skb;
2079 int len = xfrm_sa_len(x);
2080 int headlen;
2081
2082 headlen = sizeof(*p);
2083 if (c->event == XFRM_MSG_DELSA) {
2084 len += nla_total_size(headlen);
2085 headlen = sizeof(*id);
2086 }
2087 len += NLMSG_ALIGN(headlen);
2088
2089 skb = nlmsg_new(len, GFP_ATOMIC);
2090 if (skb == NULL)
2091 return -ENOMEM;
2092
2093 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2094 if (nlh == NULL)
2095 goto nla_put_failure;
2096
2097 p = nlmsg_data(nlh);
2098 if (c->event == XFRM_MSG_DELSA) {
2099 struct nlattr *attr;
2100
2101 id = nlmsg_data(nlh);
2102 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2103 id->spi = x->id.spi;
2104 id->family = x->props.family;
2105 id->proto = x->id.proto;
2106
2107 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2108 if (attr == NULL)
2109 goto nla_put_failure;
2110
2111 p = nla_data(attr);
2112 }
2113
2114 if (copy_to_user_state_extra(x, p, skb))
2115 goto nla_put_failure;
2116
2117 nlmsg_end(skb, nlh);
2118
2119 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2120
2121 nla_put_failure:
2122 /* Somebody screwed up with xfrm_sa_len! */
2123 WARN_ON(1);
2124 kfree_skb(skb);
2125 return -1;
2126 }
2127
2128 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2129 {
2130
2131 switch (c->event) {
2132 case XFRM_MSG_EXPIRE:
2133 return xfrm_exp_state_notify(x, c);
2134 case XFRM_MSG_NEWAE:
2135 return xfrm_aevent_state_notify(x, c);
2136 case XFRM_MSG_DELSA:
2137 case XFRM_MSG_UPDSA:
2138 case XFRM_MSG_NEWSA:
2139 return xfrm_notify_sa(x, c);
2140 case XFRM_MSG_FLUSHSA:
2141 return xfrm_notify_sa_flush(c);
2142 default:
2143 printk("xfrm_user: Unknown SA event %d\n", c->event);
2144 break;
2145 }
2146
2147 return 0;
2148
2149 }
2150
2151 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2152 struct xfrm_policy *xp)
2153 {
2154 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2155 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2156 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2157 + userpolicy_type_attrsize();
2158 }
2159
2160 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2161 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2162 int dir)
2163 {
2164 struct xfrm_user_acquire *ua;
2165 struct nlmsghdr *nlh;
2166 __u32 seq = xfrm_get_acqseq();
2167
2168 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2169 if (nlh == NULL)
2170 return -EMSGSIZE;
2171
2172 ua = nlmsg_data(nlh);
2173 memcpy(&ua->id, &x->id, sizeof(ua->id));
2174 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2175 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2176 copy_to_user_policy(xp, &ua->policy, dir);
2177 ua->aalgos = xt->aalgos;
2178 ua->ealgos = xt->ealgos;
2179 ua->calgos = xt->calgos;
2180 ua->seq = x->km.seq = seq;
2181
2182 if (copy_to_user_tmpl(xp, skb) < 0)
2183 goto nlmsg_failure;
2184 if (copy_to_user_state_sec_ctx(x, skb))
2185 goto nlmsg_failure;
2186 if (copy_to_user_policy_type(xp->type, skb) < 0)
2187 goto nlmsg_failure;
2188
2189 return nlmsg_end(skb, nlh);
2190
2191 nlmsg_failure:
2192 nlmsg_cancel(skb, nlh);
2193 return -EMSGSIZE;
2194 }
2195
2196 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2197 struct xfrm_policy *xp, int dir)
2198 {
2199 struct sk_buff *skb;
2200
2201 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2202 if (skb == NULL)
2203 return -ENOMEM;
2204
2205 if (build_acquire(skb, x, xt, xp, dir) < 0)
2206 BUG();
2207
2208 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2209 }
2210
2211 /* User gives us xfrm_user_policy_info followed by an array of 0
2212 * or more templates.
2213 */
2214 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2215 u8 *data, int len, int *dir)
2216 {
2217 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2218 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2219 struct xfrm_policy *xp;
2220 int nr;
2221
2222 switch (sk->sk_family) {
2223 case AF_INET:
2224 if (opt != IP_XFRM_POLICY) {
2225 *dir = -EOPNOTSUPP;
2226 return NULL;
2227 }
2228 break;
2229 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2230 case AF_INET6:
2231 if (opt != IPV6_XFRM_POLICY) {
2232 *dir = -EOPNOTSUPP;
2233 return NULL;
2234 }
2235 break;
2236 #endif
2237 default:
2238 *dir = -EINVAL;
2239 return NULL;
2240 }
2241
2242 *dir = -EINVAL;
2243
2244 if (len < sizeof(*p) ||
2245 verify_newpolicy_info(p))
2246 return NULL;
2247
2248 nr = ((len - sizeof(*p)) / sizeof(*ut));
2249 if (validate_tmpl(nr, ut, p->sel.family))
2250 return NULL;
2251
2252 if (p->dir > XFRM_POLICY_OUT)
2253 return NULL;
2254
2255 xp = xfrm_policy_alloc(GFP_KERNEL);
2256 if (xp == NULL) {
2257 *dir = -ENOBUFS;
2258 return NULL;
2259 }
2260
2261 copy_from_user_policy(xp, p);
2262 xp->type = XFRM_POLICY_TYPE_MAIN;
2263 copy_templates(xp, ut, nr);
2264
2265 *dir = p->dir;
2266
2267 return xp;
2268 }
2269
2270 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2271 {
2272 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2273 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2274 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2275 + userpolicy_type_attrsize();
2276 }
2277
2278 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2279 int dir, struct km_event *c)
2280 {
2281 struct xfrm_user_polexpire *upe;
2282 struct nlmsghdr *nlh;
2283 int hard = c->data.hard;
2284
2285 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2286 if (nlh == NULL)
2287 return -EMSGSIZE;
2288
2289 upe = nlmsg_data(nlh);
2290 copy_to_user_policy(xp, &upe->pol, dir);
2291 if (copy_to_user_tmpl(xp, skb) < 0)
2292 goto nlmsg_failure;
2293 if (copy_to_user_sec_ctx(xp, skb))
2294 goto nlmsg_failure;
2295 if (copy_to_user_policy_type(xp->type, skb) < 0)
2296 goto nlmsg_failure;
2297 upe->hard = !!hard;
2298
2299 return nlmsg_end(skb, nlh);
2300
2301 nlmsg_failure:
2302 nlmsg_cancel(skb, nlh);
2303 return -EMSGSIZE;
2304 }
2305
2306 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2307 {
2308 struct sk_buff *skb;
2309
2310 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2311 if (skb == NULL)
2312 return -ENOMEM;
2313
2314 if (build_polexpire(skb, xp, dir, c) < 0)
2315 BUG();
2316
2317 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2318 }
2319
2320 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2321 {
2322 struct xfrm_userpolicy_info *p;
2323 struct xfrm_userpolicy_id *id;
2324 struct nlmsghdr *nlh;
2325 struct sk_buff *skb;
2326 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2327 int headlen;
2328
2329 headlen = sizeof(*p);
2330 if (c->event == XFRM_MSG_DELPOLICY) {
2331 len += nla_total_size(headlen);
2332 headlen = sizeof(*id);
2333 }
2334 len += userpolicy_type_attrsize();
2335 len += NLMSG_ALIGN(headlen);
2336
2337 skb = nlmsg_new(len, GFP_ATOMIC);
2338 if (skb == NULL)
2339 return -ENOMEM;
2340
2341 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2342 if (nlh == NULL)
2343 goto nlmsg_failure;
2344
2345 p = nlmsg_data(nlh);
2346 if (c->event == XFRM_MSG_DELPOLICY) {
2347 struct nlattr *attr;
2348
2349 id = nlmsg_data(nlh);
2350 memset(id, 0, sizeof(*id));
2351 id->dir = dir;
2352 if (c->data.byid)
2353 id->index = xp->index;
2354 else
2355 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2356
2357 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2358 if (attr == NULL)
2359 goto nlmsg_failure;
2360
2361 p = nla_data(attr);
2362 }
2363
2364 copy_to_user_policy(xp, p, dir);
2365 if (copy_to_user_tmpl(xp, skb) < 0)
2366 goto nlmsg_failure;
2367 if (copy_to_user_policy_type(xp->type, skb) < 0)
2368 goto nlmsg_failure;
2369
2370 nlmsg_end(skb, nlh);
2371
2372 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2373
2374 nlmsg_failure:
2375 kfree_skb(skb);
2376 return -1;
2377 }
2378
2379 static int xfrm_notify_policy_flush(struct km_event *c)
2380 {
2381 struct nlmsghdr *nlh;
2382 struct sk_buff *skb;
2383
2384 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2385 if (skb == NULL)
2386 return -ENOMEM;
2387
2388 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2389 if (nlh == NULL)
2390 goto nlmsg_failure;
2391 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2392 goto nlmsg_failure;
2393
2394 nlmsg_end(skb, nlh);
2395
2396 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2397
2398 nlmsg_failure:
2399 kfree_skb(skb);
2400 return -1;
2401 }
2402
2403 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2404 {
2405
2406 switch (c->event) {
2407 case XFRM_MSG_NEWPOLICY:
2408 case XFRM_MSG_UPDPOLICY:
2409 case XFRM_MSG_DELPOLICY:
2410 return xfrm_notify_policy(xp, dir, c);
2411 case XFRM_MSG_FLUSHPOLICY:
2412 return xfrm_notify_policy_flush(c);
2413 case XFRM_MSG_POLEXPIRE:
2414 return xfrm_exp_policy_notify(xp, dir, c);
2415 default:
2416 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2417 }
2418
2419 return 0;
2420
2421 }
2422
2423 static inline size_t xfrm_report_msgsize(void)
2424 {
2425 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2426 }
2427
2428 static int build_report(struct sk_buff *skb, u8 proto,
2429 struct xfrm_selector *sel, xfrm_address_t *addr)
2430 {
2431 struct xfrm_user_report *ur;
2432 struct nlmsghdr *nlh;
2433
2434 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2435 if (nlh == NULL)
2436 return -EMSGSIZE;
2437
2438 ur = nlmsg_data(nlh);
2439 ur->proto = proto;
2440 memcpy(&ur->sel, sel, sizeof(ur->sel));
2441
2442 if (addr)
2443 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2444
2445 return nlmsg_end(skb, nlh);
2446
2447 nla_put_failure:
2448 nlmsg_cancel(skb, nlh);
2449 return -EMSGSIZE;
2450 }
2451
2452 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2453 xfrm_address_t *addr)
2454 {
2455 struct sk_buff *skb;
2456
2457 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2458 if (skb == NULL)
2459 return -ENOMEM;
2460
2461 if (build_report(skb, proto, sel, addr) < 0)
2462 BUG();
2463
2464 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2465 }
2466
2467 static struct xfrm_mgr netlink_mgr = {
2468 .id = "netlink",
2469 .notify = xfrm_send_state_notify,
2470 .acquire = xfrm_send_acquire,
2471 .compile_policy = xfrm_compile_policy,
2472 .notify_policy = xfrm_send_policy_notify,
2473 .report = xfrm_send_report,
2474 .migrate = xfrm_send_migrate,
2475 };
2476
2477 static int __init xfrm_user_init(void)
2478 {
2479 struct sock *nlsk;
2480
2481 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2482
2483 nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
2484 xfrm_netlink_rcv, NULL, THIS_MODULE);
2485 if (nlsk == NULL)
2486 return -ENOMEM;
2487 rcu_assign_pointer(xfrm_nl, nlsk);
2488
2489 xfrm_register_km(&netlink_mgr);
2490
2491 return 0;
2492 }
2493
2494 static void __exit xfrm_user_exit(void)
2495 {
2496 struct sock *nlsk = xfrm_nl;
2497
2498 xfrm_unregister_km(&netlink_mgr);
2499 rcu_assign_pointer(xfrm_nl, NULL);
2500 synchronize_rcu();
2501 netlink_kernel_release(nlsk);
2502 }
2503
2504 module_init(xfrm_user_init);
2505 module_exit(xfrm_user_exit);
2506 MODULE_LICENSE("GPL");
2507 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2508
Support for the Chinese Samsung S3C2440 based development boards