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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / xfrm / xfrm_user.c
blob12f19be9495981bd70636cd3b0b6d1104dec482c
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->sel.family)
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 int start_idx;
533 int this_idx;
534 };
535
536 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
537 {
538 struct xfrm_user_sec_ctx *uctx;
539 struct nlattr *attr;
540 int ctx_size = sizeof(*uctx) + s->ctx_len;
541
542 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
543 if (attr == NULL)
544 return -EMSGSIZE;
545
546 uctx = nla_data(attr);
547 uctx->exttype = XFRMA_SEC_CTX;
548 uctx->len = ctx_size;
549 uctx->ctx_doi = s->ctx_doi;
550 uctx->ctx_alg = s->ctx_alg;
551 uctx->ctx_len = s->ctx_len;
552 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
553
554 return 0;
555 }
556
557 /* Don't change this without updating xfrm_sa_len! */
558 static int copy_to_user_state_extra(struct xfrm_state *x,
559 struct xfrm_usersa_info *p,
560 struct sk_buff *skb)
561 {
562 copy_to_user_state(x, p);
563
564 if (x->coaddr)
565 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
566
567 if (x->lastused)
568 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
569
570 if (x->aead)
571 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
572 if (x->aalg)
573 NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
574 if (x->ealg)
575 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
576 if (x->calg)
577 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
578
579 if (x->encap)
580 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
581
582 if (x->security && copy_sec_ctx(x->security, skb) < 0)
583 goto nla_put_failure;
584
585 return 0;
586
587 nla_put_failure:
588 return -EMSGSIZE;
589 }
590
591 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
592 {
593 struct xfrm_dump_info *sp = ptr;
594 struct sk_buff *in_skb = sp->in_skb;
595 struct sk_buff *skb = sp->out_skb;
596 struct xfrm_usersa_info *p;
597 struct nlmsghdr *nlh;
598 int err;
599
600 if (sp->this_idx < sp->start_idx)
601 goto out;
602
603 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
604 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
605 if (nlh == NULL)
606 return -EMSGSIZE;
607
608 p = nlmsg_data(nlh);
609
610 err = copy_to_user_state_extra(x, p, skb);
611 if (err)
612 goto nla_put_failure;
613
614 nlmsg_end(skb, nlh);
615 out:
616 sp->this_idx++;
617 return 0;
618
619 nla_put_failure:
620 nlmsg_cancel(skb, nlh);
621 return err;
622 }
623
624 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
625 {
626 struct xfrm_dump_info info;
627
628 info.in_skb = cb->skb;
629 info.out_skb = skb;
630 info.nlmsg_seq = cb->nlh->nlmsg_seq;
631 info.nlmsg_flags = NLM_F_MULTI;
632 info.this_idx = 0;
633 info.start_idx = cb->args[0];
634 (void) xfrm_state_walk(0, dump_one_state, &info);
635 cb->args[0] = info.this_idx;
636
637 return skb->len;
638 }
639
640 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
641 struct xfrm_state *x, u32 seq)
642 {
643 struct xfrm_dump_info info;
644 struct sk_buff *skb;
645
646 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
647 if (!skb)
648 return ERR_PTR(-ENOMEM);
649
650 info.in_skb = in_skb;
651 info.out_skb = skb;
652 info.nlmsg_seq = seq;
653 info.nlmsg_flags = 0;
654 info.this_idx = info.start_idx = 0;
655
656 if (dump_one_state(x, 0, &info)) {
657 kfree_skb(skb);
658 return NULL;
659 }
660
661 return skb;
662 }
663
664 static inline size_t xfrm_spdinfo_msgsize(void)
665 {
666 return NLMSG_ALIGN(4)
667 + nla_total_size(sizeof(struct xfrmu_spdinfo))
668 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
669 }
670
671 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
672 {
673 struct xfrmk_spdinfo si;
674 struct xfrmu_spdinfo spc;
675 struct xfrmu_spdhinfo sph;
676 struct nlmsghdr *nlh;
677 u32 *f;
678
679 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
680 if (nlh == NULL) /* shouldnt really happen ... */
681 return -EMSGSIZE;
682
683 f = nlmsg_data(nlh);
684 *f = flags;
685 xfrm_spd_getinfo(&si);
686 spc.incnt = si.incnt;
687 spc.outcnt = si.outcnt;
688 spc.fwdcnt = si.fwdcnt;
689 spc.inscnt = si.inscnt;
690 spc.outscnt = si.outscnt;
691 spc.fwdscnt = si.fwdscnt;
692 sph.spdhcnt = si.spdhcnt;
693 sph.spdhmcnt = si.spdhmcnt;
694
695 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
696 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
697
698 return nlmsg_end(skb, nlh);
699
700 nla_put_failure:
701 nlmsg_cancel(skb, nlh);
702 return -EMSGSIZE;
703 }
704
705 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
706 struct nlattr **attrs)
707 {
708 struct sk_buff *r_skb;
709 u32 *flags = nlmsg_data(nlh);
710 u32 spid = NETLINK_CB(skb).pid;
711 u32 seq = nlh->nlmsg_seq;
712
713 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
714 if (r_skb == NULL)
715 return -ENOMEM;
716
717 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
718 BUG();
719
720 return nlmsg_unicast(xfrm_nl, r_skb, spid);
721 }
722
723 static inline size_t xfrm_sadinfo_msgsize(void)
724 {
725 return NLMSG_ALIGN(4)
726 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
727 + nla_total_size(4); /* XFRMA_SAD_CNT */
728 }
729
730 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
731 {
732 struct xfrmk_sadinfo si;
733 struct xfrmu_sadhinfo sh;
734 struct nlmsghdr *nlh;
735 u32 *f;
736
737 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
738 if (nlh == NULL) /* shouldnt really happen ... */
739 return -EMSGSIZE;
740
741 f = nlmsg_data(nlh);
742 *f = flags;
743 xfrm_sad_getinfo(&si);
744
745 sh.sadhmcnt = si.sadhmcnt;
746 sh.sadhcnt = si.sadhcnt;
747
748 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
749 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
750
751 return nlmsg_end(skb, nlh);
752
753 nla_put_failure:
754 nlmsg_cancel(skb, nlh);
755 return -EMSGSIZE;
756 }
757
758 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
759 struct nlattr **attrs)
760 {
761 struct sk_buff *r_skb;
762 u32 *flags = nlmsg_data(nlh);
763 u32 spid = NETLINK_CB(skb).pid;
764 u32 seq = nlh->nlmsg_seq;
765
766 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
767 if (r_skb == NULL)
768 return -ENOMEM;
769
770 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
771 BUG();
772
773 return nlmsg_unicast(xfrm_nl, r_skb, spid);
774 }
775
776 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
777 struct nlattr **attrs)
778 {
779 struct xfrm_usersa_id *p = nlmsg_data(nlh);
780 struct xfrm_state *x;
781 struct sk_buff *resp_skb;
782 int err = -ESRCH;
783
784 x = xfrm_user_state_lookup(p, attrs, &err);
785 if (x == NULL)
786 goto out_noput;
787
788 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
789 if (IS_ERR(resp_skb)) {
790 err = PTR_ERR(resp_skb);
791 } else {
792 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
793 }
794 xfrm_state_put(x);
795 out_noput:
796 return err;
797 }
798
799 static int verify_userspi_info(struct xfrm_userspi_info *p)
800 {
801 switch (p->info.id.proto) {
802 case IPPROTO_AH:
803 case IPPROTO_ESP:
804 break;
805
806 case IPPROTO_COMP:
807 /* IPCOMP spi is 16-bits. */
808 if (p->max >= 0x10000)
809 return -EINVAL;
810 break;
811
812 default:
813 return -EINVAL;
814 }
815
816 if (p->min > p->max)
817 return -EINVAL;
818
819 return 0;
820 }
821
822 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
823 struct nlattr **attrs)
824 {
825 struct xfrm_state *x;
826 struct xfrm_userspi_info *p;
827 struct sk_buff *resp_skb;
828 xfrm_address_t *daddr;
829 int family;
830 int err;
831
832 p = nlmsg_data(nlh);
833 err = verify_userspi_info(p);
834 if (err)
835 goto out_noput;
836
837 family = p->info.family;
838 daddr = &p->info.id.daddr;
839
840 x = NULL;
841 if (p->info.seq) {
842 x = xfrm_find_acq_byseq(p->info.seq);
843 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
844 xfrm_state_put(x);
845 x = NULL;
846 }
847 }
848
849 if (!x)
850 x = xfrm_find_acq(p->info.mode, p->info.reqid,
851 p->info.id.proto, daddr,
852 &p->info.saddr, 1,
853 family);
854 err = -ENOENT;
855 if (x == NULL)
856 goto out_noput;
857
858 err = xfrm_alloc_spi(x, p->min, p->max);
859 if (err)
860 goto out;
861
862 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
863 if (IS_ERR(resp_skb)) {
864 err = PTR_ERR(resp_skb);
865 goto out;
866 }
867
868 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
869
870 out:
871 xfrm_state_put(x);
872 out_noput:
873 return err;
874 }
875
876 static int verify_policy_dir(u8 dir)
877 {
878 switch (dir) {
879 case XFRM_POLICY_IN:
880 case XFRM_POLICY_OUT:
881 case XFRM_POLICY_FWD:
882 break;
883
884 default:
885 return -EINVAL;
886 }
887
888 return 0;
889 }
890
891 static int verify_policy_type(u8 type)
892 {
893 switch (type) {
894 case XFRM_POLICY_TYPE_MAIN:
895 #ifdef CONFIG_XFRM_SUB_POLICY
896 case XFRM_POLICY_TYPE_SUB:
897 #endif
898 break;
899
900 default:
901 return -EINVAL;
902 }
903
904 return 0;
905 }
906
907 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
908 {
909 switch (p->share) {
910 case XFRM_SHARE_ANY:
911 case XFRM_SHARE_SESSION:
912 case XFRM_SHARE_USER:
913 case XFRM_SHARE_UNIQUE:
914 break;
915
916 default:
917 return -EINVAL;
918 }
919
920 switch (p->action) {
921 case XFRM_POLICY_ALLOW:
922 case XFRM_POLICY_BLOCK:
923 break;
924
925 default:
926 return -EINVAL;
927 }
928
929 switch (p->sel.family) {
930 case AF_INET:
931 break;
932
933 case AF_INET6:
934 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
935 break;
936 #else
937 return -EAFNOSUPPORT;
938 #endif
939
940 default:
941 return -EINVAL;
942 }
943
944 return verify_policy_dir(p->dir);
945 }
946
947 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
948 {
949 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
950 struct xfrm_user_sec_ctx *uctx;
951
952 if (!rt)
953 return 0;
954
955 uctx = nla_data(rt);
956 return security_xfrm_policy_alloc(pol, uctx);
957 }
958
959 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
960 int nr)
961 {
962 int i;
963
964 xp->xfrm_nr = nr;
965 for (i = 0; i < nr; i++, ut++) {
966 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
967
968 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
969 memcpy(&t->saddr, &ut->saddr,
970 sizeof(xfrm_address_t));
971 t->reqid = ut->reqid;
972 t->mode = ut->mode;
973 t->share = ut->share;
974 t->optional = ut->optional;
975 t->aalgos = ut->aalgos;
976 t->ealgos = ut->ealgos;
977 t->calgos = ut->calgos;
978 /* If all masks are ~0, then we allow all algorithms. */
979 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
980 t->encap_family = ut->family;
981 }
982 }
983
984 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
985 {
986 int i;
987
988 if (nr > XFRM_MAX_DEPTH)
989 return -EINVAL;
990
991 for (i = 0; i < nr; i++) {
992 /* We never validated the ut->family value, so many
993 * applications simply leave it at zero. The check was
994 * never made and ut->family was ignored because all
995 * templates could be assumed to have the same family as
996 * the policy itself. Now that we will have ipv4-in-ipv6
997 * and ipv6-in-ipv4 tunnels, this is no longer true.
998 */
999 if (!ut[i].family)
1000 ut[i].family = family;
1001
1002 switch (ut[i].family) {
1003 case AF_INET:
1004 break;
1005 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1006 case AF_INET6:
1007 break;
1008 #endif
1009 default:
1010 return -EINVAL;
1011 }
1012 }
1013
1014 return 0;
1015 }
1016
1017 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1018 {
1019 struct nlattr *rt = attrs[XFRMA_TMPL];
1020
1021 if (!rt) {
1022 pol->xfrm_nr = 0;
1023 } else {
1024 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1025 int nr = nla_len(rt) / sizeof(*utmpl);
1026 int err;
1027
1028 err = validate_tmpl(nr, utmpl, pol->family);
1029 if (err)
1030 return err;
1031
1032 copy_templates(pol, utmpl, nr);
1033 }
1034 return 0;
1035 }
1036
1037 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1038 {
1039 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1040 struct xfrm_userpolicy_type *upt;
1041 u8 type = XFRM_POLICY_TYPE_MAIN;
1042 int err;
1043
1044 if (rt) {
1045 upt = nla_data(rt);
1046 type = upt->type;
1047 }
1048
1049 err = verify_policy_type(type);
1050 if (err)
1051 return err;
1052
1053 *tp = type;
1054 return 0;
1055 }
1056
1057 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1058 {
1059 xp->priority = p->priority;
1060 xp->index = p->index;
1061 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1062 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1063 xp->action = p->action;
1064 xp->flags = p->flags;
1065 xp->family = p->sel.family;
1066 /* XXX xp->share = p->share; */
1067 }
1068
1069 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1070 {
1071 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1072 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1073 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1074 p->priority = xp->priority;
1075 p->index = xp->index;
1076 p->sel.family = xp->family;
1077 p->dir = dir;
1078 p->action = xp->action;
1079 p->flags = xp->flags;
1080 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1081 }
1082
1083 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1084 {
1085 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1086 int err;
1087
1088 if (!xp) {
1089 *errp = -ENOMEM;
1090 return NULL;
1091 }
1092
1093 copy_from_user_policy(xp, p);
1094
1095 err = copy_from_user_policy_type(&xp->type, attrs);
1096 if (err)
1097 goto error;
1098
1099 if (!(err = copy_from_user_tmpl(xp, attrs)))
1100 err = copy_from_user_sec_ctx(xp, attrs);
1101 if (err)
1102 goto error;
1103
1104 return xp;
1105 error:
1106 *errp = err;
1107 xp->dead = 1;
1108 xfrm_policy_destroy(xp);
1109 return NULL;
1110 }
1111
1112 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1113 struct nlattr **attrs)
1114 {
1115 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1116 struct xfrm_policy *xp;
1117 struct km_event c;
1118 int err;
1119 int excl;
1120
1121 err = verify_newpolicy_info(p);
1122 if (err)
1123 return err;
1124 err = verify_sec_ctx_len(attrs);
1125 if (err)
1126 return err;
1127
1128 xp = xfrm_policy_construct(p, attrs, &err);
1129 if (!xp)
1130 return err;
1131
1132 /* shouldnt excl be based on nlh flags??
1133 * Aha! this is anti-netlink really i.e more pfkey derived
1134 * in netlink excl is a flag and you wouldnt need
1135 * a type XFRM_MSG_UPDPOLICY - JHS */
1136 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1137 err = xfrm_policy_insert(p->dir, xp, excl);
1138 xfrm_audit_policy_add(xp, err ? 0 : 1, NETLINK_CB(skb).loginuid,
1139 NETLINK_CB(skb).sid);
1140
1141 if (err) {
1142 security_xfrm_policy_free(xp);
1143 kfree(xp);
1144 return err;
1145 }
1146
1147 c.event = nlh->nlmsg_type;
1148 c.seq = nlh->nlmsg_seq;
1149 c.pid = nlh->nlmsg_pid;
1150 km_policy_notify(xp, p->dir, &c);
1151
1152 xfrm_pol_put(xp);
1153
1154 return 0;
1155 }
1156
1157 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1158 {
1159 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1160 int i;
1161
1162 if (xp->xfrm_nr == 0)
1163 return 0;
1164
1165 for (i = 0; i < xp->xfrm_nr; i++) {
1166 struct xfrm_user_tmpl *up = &vec[i];
1167 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1168
1169 memcpy(&up->id, &kp->id, sizeof(up->id));
1170 up->family = kp->encap_family;
1171 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1172 up->reqid = kp->reqid;
1173 up->mode = kp->mode;
1174 up->share = kp->share;
1175 up->optional = kp->optional;
1176 up->aalgos = kp->aalgos;
1177 up->ealgos = kp->ealgos;
1178 up->calgos = kp->calgos;
1179 }
1180
1181 return nla_put(skb, XFRMA_TMPL,
1182 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1183 }
1184
1185 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1186 {
1187 if (x->security) {
1188 return copy_sec_ctx(x->security, skb);
1189 }
1190 return 0;
1191 }
1192
1193 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1194 {
1195 if (xp->security) {
1196 return copy_sec_ctx(xp->security, skb);
1197 }
1198 return 0;
1199 }
1200 static inline size_t userpolicy_type_attrsize(void)
1201 {
1202 #ifdef CONFIG_XFRM_SUB_POLICY
1203 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1204 #else
1205 return 0;
1206 #endif
1207 }
1208
1209 #ifdef CONFIG_XFRM_SUB_POLICY
1210 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1211 {
1212 struct xfrm_userpolicy_type upt = {
1213 .type = type,
1214 };
1215
1216 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1217 }
1218
1219 #else
1220 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1221 {
1222 return 0;
1223 }
1224 #endif
1225
1226 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1227 {
1228 struct xfrm_dump_info *sp = ptr;
1229 struct xfrm_userpolicy_info *p;
1230 struct sk_buff *in_skb = sp->in_skb;
1231 struct sk_buff *skb = sp->out_skb;
1232 struct nlmsghdr *nlh;
1233
1234 if (sp->this_idx < sp->start_idx)
1235 goto out;
1236
1237 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1238 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1239 if (nlh == NULL)
1240 return -EMSGSIZE;
1241
1242 p = nlmsg_data(nlh);
1243 copy_to_user_policy(xp, p, dir);
1244 if (copy_to_user_tmpl(xp, skb) < 0)
1245 goto nlmsg_failure;
1246 if (copy_to_user_sec_ctx(xp, skb))
1247 goto nlmsg_failure;
1248 if (copy_to_user_policy_type(xp->type, skb) < 0)
1249 goto nlmsg_failure;
1250
1251 nlmsg_end(skb, nlh);
1252 out:
1253 sp->this_idx++;
1254 return 0;
1255
1256 nlmsg_failure:
1257 nlmsg_cancel(skb, nlh);
1258 return -EMSGSIZE;
1259 }
1260
1261 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1262 {
1263 struct xfrm_dump_info info;
1264
1265 info.in_skb = cb->skb;
1266 info.out_skb = skb;
1267 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1268 info.nlmsg_flags = NLM_F_MULTI;
1269 info.this_idx = 0;
1270 info.start_idx = cb->args[0];
1271 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1272 #ifdef CONFIG_XFRM_SUB_POLICY
1273 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1274 #endif
1275 cb->args[0] = info.this_idx;
1276
1277 return skb->len;
1278 }
1279
1280 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1281 struct xfrm_policy *xp,
1282 int dir, u32 seq)
1283 {
1284 struct xfrm_dump_info info;
1285 struct sk_buff *skb;
1286
1287 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1288 if (!skb)
1289 return ERR_PTR(-ENOMEM);
1290
1291 info.in_skb = in_skb;
1292 info.out_skb = skb;
1293 info.nlmsg_seq = seq;
1294 info.nlmsg_flags = 0;
1295 info.this_idx = info.start_idx = 0;
1296
1297 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1298 kfree_skb(skb);
1299 return NULL;
1300 }
1301
1302 return skb;
1303 }
1304
1305 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1306 struct nlattr **attrs)
1307 {
1308 struct xfrm_policy *xp;
1309 struct xfrm_userpolicy_id *p;
1310 u8 type = XFRM_POLICY_TYPE_MAIN;
1311 int err;
1312 struct km_event c;
1313 int delete;
1314
1315 p = nlmsg_data(nlh);
1316 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1317
1318 err = copy_from_user_policy_type(&type, attrs);
1319 if (err)
1320 return err;
1321
1322 err = verify_policy_dir(p->dir);
1323 if (err)
1324 return err;
1325
1326 if (p->index)
1327 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1328 else {
1329 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1330 struct xfrm_policy tmp;
1331
1332 err = verify_sec_ctx_len(attrs);
1333 if (err)
1334 return err;
1335
1336 memset(&tmp, 0, sizeof(struct xfrm_policy));
1337 if (rt) {
1338 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1339
1340 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1341 return err;
1342 }
1343 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1344 delete, &err);
1345 security_xfrm_policy_free(&tmp);
1346 }
1347 if (xp == NULL)
1348 return -ENOENT;
1349
1350 if (!delete) {
1351 struct sk_buff *resp_skb;
1352
1353 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1354 if (IS_ERR(resp_skb)) {
1355 err = PTR_ERR(resp_skb);
1356 } else {
1357 err = nlmsg_unicast(xfrm_nl, resp_skb,
1358 NETLINK_CB(skb).pid);
1359 }
1360 } else {
1361 xfrm_audit_policy_delete(xp, err ? 0 : 1,
1362 NETLINK_CB(skb).loginuid,
1363 NETLINK_CB(skb).sid);
1364
1365 if (err != 0)
1366 goto out;
1367
1368 c.data.byid = p->index;
1369 c.event = nlh->nlmsg_type;
1370 c.seq = nlh->nlmsg_seq;
1371 c.pid = nlh->nlmsg_pid;
1372 km_policy_notify(xp, p->dir, &c);
1373 }
1374
1375 out:
1376 xfrm_pol_put(xp);
1377 return err;
1378 }
1379
1380 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1381 struct nlattr **attrs)
1382 {
1383 struct km_event c;
1384 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1385 struct xfrm_audit audit_info;
1386 int err;
1387
1388 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1389 audit_info.secid = NETLINK_CB(skb).sid;
1390 err = xfrm_state_flush(p->proto, &audit_info);
1391 if (err)
1392 return err;
1393 c.data.proto = p->proto;
1394 c.event = nlh->nlmsg_type;
1395 c.seq = nlh->nlmsg_seq;
1396 c.pid = nlh->nlmsg_pid;
1397 km_state_notify(NULL, &c);
1398
1399 return 0;
1400 }
1401
1402 static inline size_t xfrm_aevent_msgsize(void)
1403 {
1404 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1405 + nla_total_size(sizeof(struct xfrm_replay_state))
1406 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1407 + nla_total_size(4) /* XFRM_AE_RTHR */
1408 + nla_total_size(4); /* XFRM_AE_ETHR */
1409 }
1410
1411 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1412 {
1413 struct xfrm_aevent_id *id;
1414 struct nlmsghdr *nlh;
1415
1416 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1417 if (nlh == NULL)
1418 return -EMSGSIZE;
1419
1420 id = nlmsg_data(nlh);
1421 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1422 id->sa_id.spi = x->id.spi;
1423 id->sa_id.family = x->props.family;
1424 id->sa_id.proto = x->id.proto;
1425 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1426 id->reqid = x->props.reqid;
1427 id->flags = c->data.aevent;
1428
1429 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1430 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1431
1432 if (id->flags & XFRM_AE_RTHR)
1433 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1434
1435 if (id->flags & XFRM_AE_ETHR)
1436 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1437 x->replay_maxage * 10 / HZ);
1438
1439 return nlmsg_end(skb, nlh);
1440
1441 nla_put_failure:
1442 nlmsg_cancel(skb, nlh);
1443 return -EMSGSIZE;
1444 }
1445
1446 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1447 struct nlattr **attrs)
1448 {
1449 struct xfrm_state *x;
1450 struct sk_buff *r_skb;
1451 int err;
1452 struct km_event c;
1453 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1454 struct xfrm_usersa_id *id = &p->sa_id;
1455
1456 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1457 if (r_skb == NULL)
1458 return -ENOMEM;
1459
1460 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1461 if (x == NULL) {
1462 kfree_skb(r_skb);
1463 return -ESRCH;
1464 }
1465
1466 /*
1467 * XXX: is this lock really needed - none of the other
1468 * gets lock (the concern is things getting updated
1469 * while we are still reading) - jhs
1470 */
1471 spin_lock_bh(&x->lock);
1472 c.data.aevent = p->flags;
1473 c.seq = nlh->nlmsg_seq;
1474 c.pid = nlh->nlmsg_pid;
1475
1476 if (build_aevent(r_skb, x, &c) < 0)
1477 BUG();
1478 err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
1479 spin_unlock_bh(&x->lock);
1480 xfrm_state_put(x);
1481 return err;
1482 }
1483
1484 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1485 struct nlattr **attrs)
1486 {
1487 struct xfrm_state *x;
1488 struct km_event c;
1489 int err = - EINVAL;
1490 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1491 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1492 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1493
1494 if (!lt && !rp)
1495 return err;
1496
1497 /* pedantic mode - thou shalt sayeth replaceth */
1498 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1499 return err;
1500
1501 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1502 if (x == NULL)
1503 return -ESRCH;
1504
1505 if (x->km.state != XFRM_STATE_VALID)
1506 goto out;
1507
1508 spin_lock_bh(&x->lock);
1509 xfrm_update_ae_params(x, attrs);
1510 spin_unlock_bh(&x->lock);
1511
1512 c.event = nlh->nlmsg_type;
1513 c.seq = nlh->nlmsg_seq;
1514 c.pid = nlh->nlmsg_pid;
1515 c.data.aevent = XFRM_AE_CU;
1516 km_state_notify(x, &c);
1517 err = 0;
1518 out:
1519 xfrm_state_put(x);
1520 return err;
1521 }
1522
1523 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1524 struct nlattr **attrs)
1525 {
1526 struct km_event c;
1527 u8 type = XFRM_POLICY_TYPE_MAIN;
1528 int err;
1529 struct xfrm_audit audit_info;
1530
1531 err = copy_from_user_policy_type(&type, attrs);
1532 if (err)
1533 return err;
1534
1535 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1536 audit_info.secid = NETLINK_CB(skb).sid;
1537 err = xfrm_policy_flush(type, &audit_info);
1538 if (err)
1539 return err;
1540 c.data.type = type;
1541 c.event = nlh->nlmsg_type;
1542 c.seq = nlh->nlmsg_seq;
1543 c.pid = nlh->nlmsg_pid;
1544 km_policy_notify(NULL, 0, &c);
1545 return 0;
1546 }
1547
1548 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1549 struct nlattr **attrs)
1550 {
1551 struct xfrm_policy *xp;
1552 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1553 struct xfrm_userpolicy_info *p = &up->pol;
1554 u8 type = XFRM_POLICY_TYPE_MAIN;
1555 int err = -ENOENT;
1556
1557 err = copy_from_user_policy_type(&type, attrs);
1558 if (err)
1559 return err;
1560
1561 if (p->index)
1562 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1563 else {
1564 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1565 struct xfrm_policy tmp;
1566
1567 err = verify_sec_ctx_len(attrs);
1568 if (err)
1569 return err;
1570
1571 memset(&tmp, 0, sizeof(struct xfrm_policy));
1572 if (rt) {
1573 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1574
1575 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1576 return err;
1577 }
1578 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1579 0, &err);
1580 security_xfrm_policy_free(&tmp);
1581 }
1582
1583 if (xp == NULL)
1584 return -ENOENT;
1585 read_lock(&xp->lock);
1586 if (xp->dead) {
1587 read_unlock(&xp->lock);
1588 goto out;
1589 }
1590
1591 read_unlock(&xp->lock);
1592 err = 0;
1593 if (up->hard) {
1594 xfrm_policy_delete(xp, p->dir);
1595 xfrm_audit_policy_delete(xp, 1, NETLINK_CB(skb).loginuid,
1596 NETLINK_CB(skb).sid);
1597
1598 } else {
1599 // reset the timers here?
1600 printk("Dont know what to do with soft policy expire\n");
1601 }
1602 km_policy_expired(xp, p->dir, up->hard, current->pid);
1603
1604 out:
1605 xfrm_pol_put(xp);
1606 return err;
1607 }
1608
1609 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1610 struct nlattr **attrs)
1611 {
1612 struct xfrm_state *x;
1613 int err;
1614 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1615 struct xfrm_usersa_info *p = &ue->state;
1616
1617 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1618
1619 err = -ENOENT;
1620 if (x == NULL)
1621 return err;
1622
1623 spin_lock_bh(&x->lock);
1624 err = -EINVAL;
1625 if (x->km.state != XFRM_STATE_VALID)
1626 goto out;
1627 km_state_expired(x, ue->hard, current->pid);
1628
1629 if (ue->hard) {
1630 __xfrm_state_delete(x);
1631 xfrm_audit_state_delete(x, 1, NETLINK_CB(skb).loginuid,
1632 NETLINK_CB(skb).sid);
1633 }
1634 err = 0;
1635 out:
1636 spin_unlock_bh(&x->lock);
1637 xfrm_state_put(x);
1638 return err;
1639 }
1640
1641 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1642 struct nlattr **attrs)
1643 {
1644 struct xfrm_policy *xp;
1645 struct xfrm_user_tmpl *ut;
1646 int i;
1647 struct nlattr *rt = attrs[XFRMA_TMPL];
1648
1649 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1650 struct xfrm_state *x = xfrm_state_alloc();
1651 int err = -ENOMEM;
1652
1653 if (!x)
1654 return err;
1655
1656 err = verify_newpolicy_info(&ua->policy);
1657 if (err) {
1658 printk("BAD policy passed\n");
1659 kfree(x);
1660 return err;
1661 }
1662
1663 /* build an XP */
1664 xp = xfrm_policy_construct(&ua->policy, attrs, &err);
1665 if (!xp) {
1666 kfree(x);
1667 return err;
1668 }
1669
1670 memcpy(&x->id, &ua->id, sizeof(ua->id));
1671 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1672 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1673
1674 ut = nla_data(rt);
1675 /* extract the templates and for each call km_key */
1676 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1677 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1678 memcpy(&x->id, &t->id, sizeof(x->id));
1679 x->props.mode = t->mode;
1680 x->props.reqid = t->reqid;
1681 x->props.family = ut->family;
1682 t->aalgos = ua->aalgos;
1683 t->ealgos = ua->ealgos;
1684 t->calgos = ua->calgos;
1685 err = km_query(x, t, xp);
1686
1687 }
1688
1689 kfree(x);
1690 kfree(xp);
1691
1692 return 0;
1693 }
1694
1695 #ifdef CONFIG_XFRM_MIGRATE
1696 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1697 struct nlattr **attrs, int *num)
1698 {
1699 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1700 struct xfrm_user_migrate *um;
1701 int i, num_migrate;
1702
1703 um = nla_data(rt);
1704 num_migrate = nla_len(rt) / sizeof(*um);
1705
1706 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1707 return -EINVAL;
1708
1709 for (i = 0; i < num_migrate; i++, um++, ma++) {
1710 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1711 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1712 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1713 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1714
1715 ma->proto = um->proto;
1716 ma->mode = um->mode;
1717 ma->reqid = um->reqid;
1718
1719 ma->old_family = um->old_family;
1720 ma->new_family = um->new_family;
1721 }
1722
1723 *num = i;
1724 return 0;
1725 }
1726
1727 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1728 struct nlattr **attrs)
1729 {
1730 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1731 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1732 u8 type;
1733 int err;
1734 int n = 0;
1735
1736 if (attrs[XFRMA_MIGRATE] == NULL)
1737 return -EINVAL;
1738
1739 err = copy_from_user_policy_type(&type, attrs);
1740 if (err)
1741 return err;
1742
1743 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1744 attrs, &n);
1745 if (err)
1746 return err;
1747
1748 if (!n)
1749 return 0;
1750
1751 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1752
1753 return 0;
1754 }
1755 #else
1756 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1757 struct nlattr **attrs)
1758 {
1759 return -ENOPROTOOPT;
1760 }
1761 #endif
1762
1763 #ifdef CONFIG_XFRM_MIGRATE
1764 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1765 {
1766 struct xfrm_user_migrate um;
1767
1768 memset(&um, 0, sizeof(um));
1769 um.proto = m->proto;
1770 um.mode = m->mode;
1771 um.reqid = m->reqid;
1772 um.old_family = m->old_family;
1773 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1774 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1775 um.new_family = m->new_family;
1776 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1777 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1778
1779 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1780 }
1781
1782 static inline size_t xfrm_migrate_msgsize(int num_migrate)
1783 {
1784 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1785 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1786 + userpolicy_type_attrsize();
1787 }
1788
1789 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1790 int num_migrate, struct xfrm_selector *sel,
1791 u8 dir, u8 type)
1792 {
1793 struct xfrm_migrate *mp;
1794 struct xfrm_userpolicy_id *pol_id;
1795 struct nlmsghdr *nlh;
1796 int i;
1797
1798 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1799 if (nlh == NULL)
1800 return -EMSGSIZE;
1801
1802 pol_id = nlmsg_data(nlh);
1803 /* copy data from selector, dir, and type to the pol_id */
1804 memset(pol_id, 0, sizeof(*pol_id));
1805 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1806 pol_id->dir = dir;
1807
1808 if (copy_to_user_policy_type(type, skb) < 0)
1809 goto nlmsg_failure;
1810
1811 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1812 if (copy_to_user_migrate(mp, skb) < 0)
1813 goto nlmsg_failure;
1814 }
1815
1816 return nlmsg_end(skb, nlh);
1817 nlmsg_failure:
1818 nlmsg_cancel(skb, nlh);
1819 return -EMSGSIZE;
1820 }
1821
1822 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1823 struct xfrm_migrate *m, int num_migrate)
1824 {
1825 struct sk_buff *skb;
1826
1827 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
1828 if (skb == NULL)
1829 return -ENOMEM;
1830
1831 /* build migrate */
1832 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1833 BUG();
1834
1835 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
1836 }
1837 #else
1838 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1839 struct xfrm_migrate *m, int num_migrate)
1840 {
1841 return -ENOPROTOOPT;
1842 }
1843 #endif
1844
1845 #define XMSGSIZE(type) sizeof(struct type)
1846
1847 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1848 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1849 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1850 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1851 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1852 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1853 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1854 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1855 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1856 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1857 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1858 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1859 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1860 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1861 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
1862 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1863 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1864 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1865 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1866 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
1867 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1868 };
1869
1870 #undef XMSGSIZE
1871
1872 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1873 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
1874 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
1875 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
1876 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
1877 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
1878 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
1879 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
1880 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
1881 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
1882 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
1883 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
1884 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
1885 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
1886 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
1887 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
1888 };
1889
1890 static struct xfrm_link {
1891 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1892 int (*dump)(struct sk_buff *, struct netlink_callback *);
1893 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1894 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1895 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1896 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1897 .dump = xfrm_dump_sa },
1898 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1899 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1900 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1901 .dump = xfrm_dump_policy },
1902 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1903 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1904 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1905 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1906 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1907 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1908 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1909 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1910 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1911 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1912 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1913 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1914 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1915 };
1916
1917 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1918 {
1919 struct nlattr *attrs[XFRMA_MAX+1];
1920 struct xfrm_link *link;
1921 int type, err;
1922
1923 type = nlh->nlmsg_type;
1924 if (type > XFRM_MSG_MAX)
1925 return -EINVAL;
1926
1927 type -= XFRM_MSG_BASE;
1928 link = &xfrm_dispatch[type];
1929
1930 /* All operations require privileges, even GET */
1931 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1932 return -EPERM;
1933
1934 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1935 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1936 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1937 if (link->dump == NULL)
1938 return -EINVAL;
1939
1940 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
1941 }
1942
1943 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
1944 xfrma_policy);
1945 if (err < 0)
1946 return err;
1947
1948 if (link->doit == NULL)
1949 return -EINVAL;
1950
1951 return link->doit(skb, nlh, attrs);
1952 }
1953
1954 static void xfrm_netlink_rcv(struct sk_buff *skb)
1955 {
1956 mutex_lock(&xfrm_cfg_mutex);
1957 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
1958 mutex_unlock(&xfrm_cfg_mutex);
1959 }
1960
1961 static inline size_t xfrm_expire_msgsize(void)
1962 {
1963 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
1964 }
1965
1966 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1967 {
1968 struct xfrm_user_expire *ue;
1969 struct nlmsghdr *nlh;
1970
1971 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
1972 if (nlh == NULL)
1973 return -EMSGSIZE;
1974
1975 ue = nlmsg_data(nlh);
1976 copy_to_user_state(x, &ue->state);
1977 ue->hard = (c->data.hard != 0) ? 1 : 0;
1978
1979 return nlmsg_end(skb, nlh);
1980 }
1981
1982 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1983 {
1984 struct sk_buff *skb;
1985
1986 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1987 if (skb == NULL)
1988 return -ENOMEM;
1989
1990 if (build_expire(skb, x, c) < 0)
1991 BUG();
1992
1993 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1994 }
1995
1996 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1997 {
1998 struct sk_buff *skb;
1999
2000 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2001 if (skb == NULL)
2002 return -ENOMEM;
2003
2004 if (build_aevent(skb, x, c) < 0)
2005 BUG();
2006
2007 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2008 }
2009
2010 static int xfrm_notify_sa_flush(struct km_event *c)
2011 {
2012 struct xfrm_usersa_flush *p;
2013 struct nlmsghdr *nlh;
2014 struct sk_buff *skb;
2015 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2016
2017 skb = nlmsg_new(len, GFP_ATOMIC);
2018 if (skb == NULL)
2019 return -ENOMEM;
2020
2021 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2022 if (nlh == NULL) {
2023 kfree_skb(skb);
2024 return -EMSGSIZE;
2025 }
2026
2027 p = nlmsg_data(nlh);
2028 p->proto = c->data.proto;
2029
2030 nlmsg_end(skb, nlh);
2031
2032 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2033 }
2034
2035 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2036 {
2037 size_t l = 0;
2038 if (x->aead)
2039 l += nla_total_size(aead_len(x->aead));
2040 if (x->aalg)
2041 l += nla_total_size(xfrm_alg_len(x->aalg));
2042 if (x->ealg)
2043 l += nla_total_size(xfrm_alg_len(x->ealg));
2044 if (x->calg)
2045 l += nla_total_size(sizeof(*x->calg));
2046 if (x->encap)
2047 l += nla_total_size(sizeof(*x->encap));
2048 if (x->security)
2049 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2050 x->security->ctx_len);
2051 if (x->coaddr)
2052 l += nla_total_size(sizeof(*x->coaddr));
2053
2054 /* Must count x->lastused as it may become non-zero behind our back. */
2055 l += nla_total_size(sizeof(u64));
2056
2057 return l;
2058 }
2059
2060 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2061 {
2062 struct xfrm_usersa_info *p;
2063 struct xfrm_usersa_id *id;
2064 struct nlmsghdr *nlh;
2065 struct sk_buff *skb;
2066 int len = xfrm_sa_len(x);
2067 int headlen;
2068
2069 headlen = sizeof(*p);
2070 if (c->event == XFRM_MSG_DELSA) {
2071 len += nla_total_size(headlen);
2072 headlen = sizeof(*id);
2073 }
2074 len += NLMSG_ALIGN(headlen);
2075
2076 skb = nlmsg_new(len, GFP_ATOMIC);
2077 if (skb == NULL)
2078 return -ENOMEM;
2079
2080 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2081 if (nlh == NULL)
2082 goto nla_put_failure;
2083
2084 p = nlmsg_data(nlh);
2085 if (c->event == XFRM_MSG_DELSA) {
2086 struct nlattr *attr;
2087
2088 id = nlmsg_data(nlh);
2089 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2090 id->spi = x->id.spi;
2091 id->family = x->props.family;
2092 id->proto = x->id.proto;
2093
2094 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2095 if (attr == NULL)
2096 goto nla_put_failure;
2097
2098 p = nla_data(attr);
2099 }
2100
2101 if (copy_to_user_state_extra(x, p, skb))
2102 goto nla_put_failure;
2103
2104 nlmsg_end(skb, nlh);
2105
2106 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2107
2108 nla_put_failure:
2109 /* Somebody screwed up with xfrm_sa_len! */
2110 WARN_ON(1);
2111 kfree_skb(skb);
2112 return -1;
2113 }
2114
2115 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2116 {
2117
2118 switch (c->event) {
2119 case XFRM_MSG_EXPIRE:
2120 return xfrm_exp_state_notify(x, c);
2121 case XFRM_MSG_NEWAE:
2122 return xfrm_aevent_state_notify(x, c);
2123 case XFRM_MSG_DELSA:
2124 case XFRM_MSG_UPDSA:
2125 case XFRM_MSG_NEWSA:
2126 return xfrm_notify_sa(x, c);
2127 case XFRM_MSG_FLUSHSA:
2128 return xfrm_notify_sa_flush(c);
2129 default:
2130 printk("xfrm_user: Unknown SA event %d\n", c->event);
2131 break;
2132 }
2133
2134 return 0;
2135
2136 }
2137
2138 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2139 struct xfrm_policy *xp)
2140 {
2141 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2142 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2143 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2144 + userpolicy_type_attrsize();
2145 }
2146
2147 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2148 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2149 int dir)
2150 {
2151 struct xfrm_user_acquire *ua;
2152 struct nlmsghdr *nlh;
2153 __u32 seq = xfrm_get_acqseq();
2154
2155 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2156 if (nlh == NULL)
2157 return -EMSGSIZE;
2158
2159 ua = nlmsg_data(nlh);
2160 memcpy(&ua->id, &x->id, sizeof(ua->id));
2161 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2162 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2163 copy_to_user_policy(xp, &ua->policy, dir);
2164 ua->aalgos = xt->aalgos;
2165 ua->ealgos = xt->ealgos;
2166 ua->calgos = xt->calgos;
2167 ua->seq = x->km.seq = seq;
2168
2169 if (copy_to_user_tmpl(xp, skb) < 0)
2170 goto nlmsg_failure;
2171 if (copy_to_user_state_sec_ctx(x, skb))
2172 goto nlmsg_failure;
2173 if (copy_to_user_policy_type(xp->type, skb) < 0)
2174 goto nlmsg_failure;
2175
2176 return nlmsg_end(skb, nlh);
2177
2178 nlmsg_failure:
2179 nlmsg_cancel(skb, nlh);
2180 return -EMSGSIZE;
2181 }
2182
2183 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2184 struct xfrm_policy *xp, int dir)
2185 {
2186 struct sk_buff *skb;
2187
2188 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2189 if (skb == NULL)
2190 return -ENOMEM;
2191
2192 if (build_acquire(skb, x, xt, xp, dir) < 0)
2193 BUG();
2194
2195 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2196 }
2197
2198 /* User gives us xfrm_user_policy_info followed by an array of 0
2199 * or more templates.
2200 */
2201 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2202 u8 *data, int len, int *dir)
2203 {
2204 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2205 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2206 struct xfrm_policy *xp;
2207 int nr;
2208
2209 switch (sk->sk_family) {
2210 case AF_INET:
2211 if (opt != IP_XFRM_POLICY) {
2212 *dir = -EOPNOTSUPP;
2213 return NULL;
2214 }
2215 break;
2216 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2217 case AF_INET6:
2218 if (opt != IPV6_XFRM_POLICY) {
2219 *dir = -EOPNOTSUPP;
2220 return NULL;
2221 }
2222 break;
2223 #endif
2224 default:
2225 *dir = -EINVAL;
2226 return NULL;
2227 }
2228
2229 *dir = -EINVAL;
2230
2231 if (len < sizeof(*p) ||
2232 verify_newpolicy_info(p))
2233 return NULL;
2234
2235 nr = ((len - sizeof(*p)) / sizeof(*ut));
2236 if (validate_tmpl(nr, ut, p->sel.family))
2237 return NULL;
2238
2239 if (p->dir > XFRM_POLICY_OUT)
2240 return NULL;
2241
2242 xp = xfrm_policy_alloc(GFP_KERNEL);
2243 if (xp == NULL) {
2244 *dir = -ENOBUFS;
2245 return NULL;
2246 }
2247
2248 copy_from_user_policy(xp, p);
2249 xp->type = XFRM_POLICY_TYPE_MAIN;
2250 copy_templates(xp, ut, nr);
2251
2252 *dir = p->dir;
2253
2254 return xp;
2255 }
2256
2257 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2258 {
2259 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2260 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2261 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2262 + userpolicy_type_attrsize();
2263 }
2264
2265 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2266 int dir, struct km_event *c)
2267 {
2268 struct xfrm_user_polexpire *upe;
2269 struct nlmsghdr *nlh;
2270 int hard = c->data.hard;
2271
2272 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2273 if (nlh == NULL)
2274 return -EMSGSIZE;
2275
2276 upe = nlmsg_data(nlh);
2277 copy_to_user_policy(xp, &upe->pol, dir);
2278 if (copy_to_user_tmpl(xp, skb) < 0)
2279 goto nlmsg_failure;
2280 if (copy_to_user_sec_ctx(xp, skb))
2281 goto nlmsg_failure;
2282 if (copy_to_user_policy_type(xp->type, skb) < 0)
2283 goto nlmsg_failure;
2284 upe->hard = !!hard;
2285
2286 return nlmsg_end(skb, nlh);
2287
2288 nlmsg_failure:
2289 nlmsg_cancel(skb, nlh);
2290 return -EMSGSIZE;
2291 }
2292
2293 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2294 {
2295 struct sk_buff *skb;
2296
2297 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2298 if (skb == NULL)
2299 return -ENOMEM;
2300
2301 if (build_polexpire(skb, xp, dir, c) < 0)
2302 BUG();
2303
2304 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2305 }
2306
2307 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2308 {
2309 struct xfrm_userpolicy_info *p;
2310 struct xfrm_userpolicy_id *id;
2311 struct nlmsghdr *nlh;
2312 struct sk_buff *skb;
2313 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2314 int headlen;
2315
2316 headlen = sizeof(*p);
2317 if (c->event == XFRM_MSG_DELPOLICY) {
2318 len += nla_total_size(headlen);
2319 headlen = sizeof(*id);
2320 }
2321 len += userpolicy_type_attrsize();
2322 len += NLMSG_ALIGN(headlen);
2323
2324 skb = nlmsg_new(len, GFP_ATOMIC);
2325 if (skb == NULL)
2326 return -ENOMEM;
2327
2328 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2329 if (nlh == NULL)
2330 goto nlmsg_failure;
2331
2332 p = nlmsg_data(nlh);
2333 if (c->event == XFRM_MSG_DELPOLICY) {
2334 struct nlattr *attr;
2335
2336 id = nlmsg_data(nlh);
2337 memset(id, 0, sizeof(*id));
2338 id->dir = dir;
2339 if (c->data.byid)
2340 id->index = xp->index;
2341 else
2342 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2343
2344 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2345 if (attr == NULL)
2346 goto nlmsg_failure;
2347
2348 p = nla_data(attr);
2349 }
2350
2351 copy_to_user_policy(xp, p, dir);
2352 if (copy_to_user_tmpl(xp, skb) < 0)
2353 goto nlmsg_failure;
2354 if (copy_to_user_policy_type(xp->type, skb) < 0)
2355 goto nlmsg_failure;
2356
2357 nlmsg_end(skb, nlh);
2358
2359 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2360
2361 nlmsg_failure:
2362 kfree_skb(skb);
2363 return -1;
2364 }
2365
2366 static int xfrm_notify_policy_flush(struct km_event *c)
2367 {
2368 struct nlmsghdr *nlh;
2369 struct sk_buff *skb;
2370
2371 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2372 if (skb == NULL)
2373 return -ENOMEM;
2374
2375 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2376 if (nlh == NULL)
2377 goto nlmsg_failure;
2378 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2379 goto nlmsg_failure;
2380
2381 nlmsg_end(skb, nlh);
2382
2383 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2384
2385 nlmsg_failure:
2386 kfree_skb(skb);
2387 return -1;
2388 }
2389
2390 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2391 {
2392
2393 switch (c->event) {
2394 case XFRM_MSG_NEWPOLICY:
2395 case XFRM_MSG_UPDPOLICY:
2396 case XFRM_MSG_DELPOLICY:
2397 return xfrm_notify_policy(xp, dir, c);
2398 case XFRM_MSG_FLUSHPOLICY:
2399 return xfrm_notify_policy_flush(c);
2400 case XFRM_MSG_POLEXPIRE:
2401 return xfrm_exp_policy_notify(xp, dir, c);
2402 default:
2403 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2404 }
2405
2406 return 0;
2407
2408 }
2409
2410 static inline size_t xfrm_report_msgsize(void)
2411 {
2412 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2413 }
2414
2415 static int build_report(struct sk_buff *skb, u8 proto,
2416 struct xfrm_selector *sel, xfrm_address_t *addr)
2417 {
2418 struct xfrm_user_report *ur;
2419 struct nlmsghdr *nlh;
2420
2421 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2422 if (nlh == NULL)
2423 return -EMSGSIZE;
2424
2425 ur = nlmsg_data(nlh);
2426 ur->proto = proto;
2427 memcpy(&ur->sel, sel, sizeof(ur->sel));
2428
2429 if (addr)
2430 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2431
2432 return nlmsg_end(skb, nlh);
2433
2434 nla_put_failure:
2435 nlmsg_cancel(skb, nlh);
2436 return -EMSGSIZE;
2437 }
2438
2439 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2440 xfrm_address_t *addr)
2441 {
2442 struct sk_buff *skb;
2443
2444 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2445 if (skb == NULL)
2446 return -ENOMEM;
2447
2448 if (build_report(skb, proto, sel, addr) < 0)
2449 BUG();
2450
2451 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2452 }
2453
2454 static struct xfrm_mgr netlink_mgr = {
2455 .id = "netlink",
2456 .notify = xfrm_send_state_notify,
2457 .acquire = xfrm_send_acquire,
2458 .compile_policy = xfrm_compile_policy,
2459 .notify_policy = xfrm_send_policy_notify,
2460 .report = xfrm_send_report,
2461 .migrate = xfrm_send_migrate,
2462 };
2463
2464 static int __init xfrm_user_init(void)
2465 {
2466 struct sock *nlsk;
2467
2468 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2469
2470 nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
2471 xfrm_netlink_rcv, NULL, THIS_MODULE);
2472 if (nlsk == NULL)
2473 return -ENOMEM;
2474 rcu_assign_pointer(xfrm_nl, nlsk);
2475
2476 xfrm_register_km(&netlink_mgr);
2477
2478 return 0;
2479 }
2480
2481 static void __exit xfrm_user_exit(void)
2482 {
2483 struct sock *nlsk = xfrm_nl;
2484
2485 xfrm_unregister_km(&netlink_mgr);
2486 rcu_assign_pointer(xfrm_nl, NULL);
2487 synchronize_rcu();
2488 netlink_kernel_release(nlsk);
2489 }
2490
2491 module_init(xfrm_user_init);
2492 module_exit(xfrm_user_exit);
2493 MODULE_LICENSE("GPL");
2494 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2495
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