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