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[SIT]: Use proper net in hash-lookup functions.
[deliverable/linux.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/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 };
533
534 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
535 {
536 struct xfrm_user_sec_ctx *uctx;
537 struct nlattr *attr;
538 int ctx_size = sizeof(*uctx) + s->ctx_len;
539
540 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
541 if (attr == NULL)
542 return -EMSGSIZE;
543
544 uctx = nla_data(attr);
545 uctx->exttype = XFRMA_SEC_CTX;
546 uctx->len = ctx_size;
547 uctx->ctx_doi = s->ctx_doi;
548 uctx->ctx_alg = s->ctx_alg;
549 uctx->ctx_len = s->ctx_len;
550 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
551
552 return 0;
553 }
554
555 /* Don't change this without updating xfrm_sa_len! */
556 static int copy_to_user_state_extra(struct xfrm_state *x,
557 struct xfrm_usersa_info *p,
558 struct sk_buff *skb)
559 {
560 copy_to_user_state(x, p);
561
562 if (x->coaddr)
563 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
564
565 if (x->lastused)
566 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
567
568 if (x->aead)
569 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
570 if (x->aalg)
571 NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
572 if (x->ealg)
573 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
574 if (x->calg)
575 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
576
577 if (x->encap)
578 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
579
580 if (x->security && copy_sec_ctx(x->security, skb) < 0)
581 goto nla_put_failure;
582
583 return 0;
584
585 nla_put_failure:
586 return -EMSGSIZE;
587 }
588
589 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
590 {
591 struct xfrm_dump_info *sp = ptr;
592 struct sk_buff *in_skb = sp->in_skb;
593 struct sk_buff *skb = sp->out_skb;
594 struct xfrm_usersa_info *p;
595 struct nlmsghdr *nlh;
596 int err;
597
598 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
599 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
600 if (nlh == NULL)
601 return -EMSGSIZE;
602
603 p = nlmsg_data(nlh);
604
605 err = copy_to_user_state_extra(x, p, skb);
606 if (err)
607 goto nla_put_failure;
608
609 nlmsg_end(skb, nlh);
610 return 0;
611
612 nla_put_failure:
613 nlmsg_cancel(skb, nlh);
614 return err;
615 }
616
617 static int xfrm_dump_sa_done(struct netlink_callback *cb)
618 {
619 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
620 xfrm_state_walk_done(walk);
621 return 0;
622 }
623
624 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
625 {
626 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
627 struct xfrm_dump_info info;
628
629 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
630 sizeof(cb->args) - sizeof(cb->args[0]));
631
632 info.in_skb = cb->skb;
633 info.out_skb = skb;
634 info.nlmsg_seq = cb->nlh->nlmsg_seq;
635 info.nlmsg_flags = NLM_F_MULTI;
636
637 if (!cb->args[0]) {
638 cb->args[0] = 1;
639 xfrm_state_walk_init(walk, 0);
640 }
641
642 (void) xfrm_state_walk(walk, dump_one_state, &info);
643
644 return skb->len;
645 }
646
647 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
648 struct xfrm_state *x, u32 seq)
649 {
650 struct xfrm_dump_info info;
651 struct sk_buff *skb;
652
653 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
654 if (!skb)
655 return ERR_PTR(-ENOMEM);
656
657 info.in_skb = in_skb;
658 info.out_skb = skb;
659 info.nlmsg_seq = seq;
660 info.nlmsg_flags = 0;
661
662 if (dump_one_state(x, 0, &info)) {
663 kfree_skb(skb);
664 return NULL;
665 }
666
667 return skb;
668 }
669
670 static inline size_t xfrm_spdinfo_msgsize(void)
671 {
672 return NLMSG_ALIGN(4)
673 + nla_total_size(sizeof(struct xfrmu_spdinfo))
674 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
675 }
676
677 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
678 {
679 struct xfrmk_spdinfo si;
680 struct xfrmu_spdinfo spc;
681 struct xfrmu_spdhinfo sph;
682 struct nlmsghdr *nlh;
683 u32 *f;
684
685 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
686 if (nlh == NULL) /* shouldnt really happen ... */
687 return -EMSGSIZE;
688
689 f = nlmsg_data(nlh);
690 *f = flags;
691 xfrm_spd_getinfo(&si);
692 spc.incnt = si.incnt;
693 spc.outcnt = si.outcnt;
694 spc.fwdcnt = si.fwdcnt;
695 spc.inscnt = si.inscnt;
696 spc.outscnt = si.outscnt;
697 spc.fwdscnt = si.fwdscnt;
698 sph.spdhcnt = si.spdhcnt;
699 sph.spdhmcnt = si.spdhmcnt;
700
701 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
702 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
703
704 return nlmsg_end(skb, nlh);
705
706 nla_put_failure:
707 nlmsg_cancel(skb, nlh);
708 return -EMSGSIZE;
709 }
710
711 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
712 struct nlattr **attrs)
713 {
714 struct sk_buff *r_skb;
715 u32 *flags = nlmsg_data(nlh);
716 u32 spid = NETLINK_CB(skb).pid;
717 u32 seq = nlh->nlmsg_seq;
718
719 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
720 if (r_skb == NULL)
721 return -ENOMEM;
722
723 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
724 BUG();
725
726 return nlmsg_unicast(xfrm_nl, r_skb, spid);
727 }
728
729 static inline size_t xfrm_sadinfo_msgsize(void)
730 {
731 return NLMSG_ALIGN(4)
732 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
733 + nla_total_size(4); /* XFRMA_SAD_CNT */
734 }
735
736 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
737 {
738 struct xfrmk_sadinfo si;
739 struct xfrmu_sadhinfo sh;
740 struct nlmsghdr *nlh;
741 u32 *f;
742
743 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
744 if (nlh == NULL) /* shouldnt really happen ... */
745 return -EMSGSIZE;
746
747 f = nlmsg_data(nlh);
748 *f = flags;
749 xfrm_sad_getinfo(&si);
750
751 sh.sadhmcnt = si.sadhmcnt;
752 sh.sadhcnt = si.sadhcnt;
753
754 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
755 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
756
757 return nlmsg_end(skb, nlh);
758
759 nla_put_failure:
760 nlmsg_cancel(skb, nlh);
761 return -EMSGSIZE;
762 }
763
764 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
765 struct nlattr **attrs)
766 {
767 struct sk_buff *r_skb;
768 u32 *flags = nlmsg_data(nlh);
769 u32 spid = NETLINK_CB(skb).pid;
770 u32 seq = nlh->nlmsg_seq;
771
772 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
773 if (r_skb == NULL)
774 return -ENOMEM;
775
776 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
777 BUG();
778
779 return nlmsg_unicast(xfrm_nl, r_skb, spid);
780 }
781
782 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
783 struct nlattr **attrs)
784 {
785 struct xfrm_usersa_id *p = nlmsg_data(nlh);
786 struct xfrm_state *x;
787 struct sk_buff *resp_skb;
788 int err = -ESRCH;
789
790 x = xfrm_user_state_lookup(p, attrs, &err);
791 if (x == NULL)
792 goto out_noput;
793
794 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
795 if (IS_ERR(resp_skb)) {
796 err = PTR_ERR(resp_skb);
797 } else {
798 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
799 }
800 xfrm_state_put(x);
801 out_noput:
802 return err;
803 }
804
805 static int verify_userspi_info(struct xfrm_userspi_info *p)
806 {
807 switch (p->info.id.proto) {
808 case IPPROTO_AH:
809 case IPPROTO_ESP:
810 break;
811
812 case IPPROTO_COMP:
813 /* IPCOMP spi is 16-bits. */
814 if (p->max >= 0x10000)
815 return -EINVAL;
816 break;
817
818 default:
819 return -EINVAL;
820 }
821
822 if (p->min > p->max)
823 return -EINVAL;
824
825 return 0;
826 }
827
828 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
829 struct nlattr **attrs)
830 {
831 struct xfrm_state *x;
832 struct xfrm_userspi_info *p;
833 struct sk_buff *resp_skb;
834 xfrm_address_t *daddr;
835 int family;
836 int err;
837
838 p = nlmsg_data(nlh);
839 err = verify_userspi_info(p);
840 if (err)
841 goto out_noput;
842
843 family = p->info.family;
844 daddr = &p->info.id.daddr;
845
846 x = NULL;
847 if (p->info.seq) {
848 x = xfrm_find_acq_byseq(p->info.seq);
849 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
850 xfrm_state_put(x);
851 x = NULL;
852 }
853 }
854
855 if (!x)
856 x = xfrm_find_acq(p->info.mode, p->info.reqid,
857 p->info.id.proto, daddr,
858 &p->info.saddr, 1,
859 family);
860 err = -ENOENT;
861 if (x == NULL)
862 goto out_noput;
863
864 err = xfrm_alloc_spi(x, p->min, p->max);
865 if (err)
866 goto out;
867
868 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
869 if (IS_ERR(resp_skb)) {
870 err = PTR_ERR(resp_skb);
871 goto out;
872 }
873
874 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
875
876 out:
877 xfrm_state_put(x);
878 out_noput:
879 return err;
880 }
881
882 static int verify_policy_dir(u8 dir)
883 {
884 switch (dir) {
885 case XFRM_POLICY_IN:
886 case XFRM_POLICY_OUT:
887 case XFRM_POLICY_FWD:
888 break;
889
890 default:
891 return -EINVAL;
892 }
893
894 return 0;
895 }
896
897 static int verify_policy_type(u8 type)
898 {
899 switch (type) {
900 case XFRM_POLICY_TYPE_MAIN:
901 #ifdef CONFIG_XFRM_SUB_POLICY
902 case XFRM_POLICY_TYPE_SUB:
903 #endif
904 break;
905
906 default:
907 return -EINVAL;
908 }
909
910 return 0;
911 }
912
913 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
914 {
915 switch (p->share) {
916 case XFRM_SHARE_ANY:
917 case XFRM_SHARE_SESSION:
918 case XFRM_SHARE_USER:
919 case XFRM_SHARE_UNIQUE:
920 break;
921
922 default:
923 return -EINVAL;
924 }
925
926 switch (p->action) {
927 case XFRM_POLICY_ALLOW:
928 case XFRM_POLICY_BLOCK:
929 break;
930
931 default:
932 return -EINVAL;
933 }
934
935 switch (p->sel.family) {
936 case AF_INET:
937 break;
938
939 case AF_INET6:
940 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
941 break;
942 #else
943 return -EAFNOSUPPORT;
944 #endif
945
946 default:
947 return -EINVAL;
948 }
949
950 return verify_policy_dir(p->dir);
951 }
952
953 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
954 {
955 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
956 struct xfrm_user_sec_ctx *uctx;
957
958 if (!rt)
959 return 0;
960
961 uctx = nla_data(rt);
962 return security_xfrm_policy_alloc(&pol->security, uctx);
963 }
964
965 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
966 int nr)
967 {
968 int i;
969
970 xp->xfrm_nr = nr;
971 for (i = 0; i < nr; i++, ut++) {
972 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
973
974 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
975 memcpy(&t->saddr, &ut->saddr,
976 sizeof(xfrm_address_t));
977 t->reqid = ut->reqid;
978 t->mode = ut->mode;
979 t->share = ut->share;
980 t->optional = ut->optional;
981 t->aalgos = ut->aalgos;
982 t->ealgos = ut->ealgos;
983 t->calgos = ut->calgos;
984 t->encap_family = ut->family;
985 }
986 }
987
988 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
989 {
990 int i;
991
992 if (nr > XFRM_MAX_DEPTH)
993 return -EINVAL;
994
995 for (i = 0; i < nr; i++) {
996 /* We never validated the ut->family value, so many
997 * applications simply leave it at zero. The check was
998 * never made and ut->family was ignored because all
999 * templates could be assumed to have the same family as
1000 * the policy itself. Now that we will have ipv4-in-ipv6
1001 * and ipv6-in-ipv4 tunnels, this is no longer true.
1002 */
1003 if (!ut[i].family)
1004 ut[i].family = family;
1005
1006 switch (ut[i].family) {
1007 case AF_INET:
1008 break;
1009 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1010 case AF_INET6:
1011 break;
1012 #endif
1013 default:
1014 return -EINVAL;
1015 }
1016 }
1017
1018 return 0;
1019 }
1020
1021 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1022 {
1023 struct nlattr *rt = attrs[XFRMA_TMPL];
1024
1025 if (!rt) {
1026 pol->xfrm_nr = 0;
1027 } else {
1028 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1029 int nr = nla_len(rt) / sizeof(*utmpl);
1030 int err;
1031
1032 err = validate_tmpl(nr, utmpl, pol->family);
1033 if (err)
1034 return err;
1035
1036 copy_templates(pol, utmpl, nr);
1037 }
1038 return 0;
1039 }
1040
1041 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1042 {
1043 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1044 struct xfrm_userpolicy_type *upt;
1045 u8 type = XFRM_POLICY_TYPE_MAIN;
1046 int err;
1047
1048 if (rt) {
1049 upt = nla_data(rt);
1050 type = upt->type;
1051 }
1052
1053 err = verify_policy_type(type);
1054 if (err)
1055 return err;
1056
1057 *tp = type;
1058 return 0;
1059 }
1060
1061 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1062 {
1063 xp->priority = p->priority;
1064 xp->index = p->index;
1065 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1066 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1067 xp->action = p->action;
1068 xp->flags = p->flags;
1069 xp->family = p->sel.family;
1070 /* XXX xp->share = p->share; */
1071 }
1072
1073 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1074 {
1075 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1076 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1077 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1078 p->priority = xp->priority;
1079 p->index = xp->index;
1080 p->sel.family = xp->family;
1081 p->dir = dir;
1082 p->action = xp->action;
1083 p->flags = xp->flags;
1084 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1085 }
1086
1087 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1088 {
1089 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1090 int err;
1091
1092 if (!xp) {
1093 *errp = -ENOMEM;
1094 return NULL;
1095 }
1096
1097 copy_from_user_policy(xp, p);
1098
1099 err = copy_from_user_policy_type(&xp->type, attrs);
1100 if (err)
1101 goto error;
1102
1103 if (!(err = copy_from_user_tmpl(xp, attrs)))
1104 err = copy_from_user_sec_ctx(xp, attrs);
1105 if (err)
1106 goto error;
1107
1108 return xp;
1109 error:
1110 *errp = err;
1111 xp->dead = 1;
1112 xfrm_policy_destroy(xp);
1113 return NULL;
1114 }
1115
1116 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1117 struct nlattr **attrs)
1118 {
1119 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1120 struct xfrm_policy *xp;
1121 struct km_event c;
1122 int err;
1123 int excl;
1124
1125 err = verify_newpolicy_info(p);
1126 if (err)
1127 return err;
1128 err = verify_sec_ctx_len(attrs);
1129 if (err)
1130 return err;
1131
1132 xp = xfrm_policy_construct(p, attrs, &err);
1133 if (!xp)
1134 return err;
1135
1136 /* shouldnt excl be based on nlh flags??
1137 * Aha! this is anti-netlink really i.e more pfkey derived
1138 * in netlink excl is a flag and you wouldnt need
1139 * a type XFRM_MSG_UPDPOLICY - JHS */
1140 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1141 err = xfrm_policy_insert(p->dir, xp, excl);
1142 xfrm_audit_policy_add(xp, err ? 0 : 1, NETLINK_CB(skb).loginuid,
1143 NETLINK_CB(skb).sid);
1144
1145 if (err) {
1146 security_xfrm_policy_free(xp->security);
1147 kfree(xp);
1148 return err;
1149 }
1150
1151 c.event = nlh->nlmsg_type;
1152 c.seq = nlh->nlmsg_seq;
1153 c.pid = nlh->nlmsg_pid;
1154 km_policy_notify(xp, p->dir, &c);
1155
1156 xfrm_pol_put(xp);
1157
1158 return 0;
1159 }
1160
1161 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1162 {
1163 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1164 int i;
1165
1166 if (xp->xfrm_nr == 0)
1167 return 0;
1168
1169 for (i = 0; i < xp->xfrm_nr; i++) {
1170 struct xfrm_user_tmpl *up = &vec[i];
1171 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1172
1173 memcpy(&up->id, &kp->id, sizeof(up->id));
1174 up->family = kp->encap_family;
1175 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1176 up->reqid = kp->reqid;
1177 up->mode = kp->mode;
1178 up->share = kp->share;
1179 up->optional = kp->optional;
1180 up->aalgos = kp->aalgos;
1181 up->ealgos = kp->ealgos;
1182 up->calgos = kp->calgos;
1183 }
1184
1185 return nla_put(skb, XFRMA_TMPL,
1186 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1187 }
1188
1189 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1190 {
1191 if (x->security) {
1192 return copy_sec_ctx(x->security, skb);
1193 }
1194 return 0;
1195 }
1196
1197 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1198 {
1199 if (xp->security) {
1200 return copy_sec_ctx(xp->security, skb);
1201 }
1202 return 0;
1203 }
1204 static inline size_t userpolicy_type_attrsize(void)
1205 {
1206 #ifdef CONFIG_XFRM_SUB_POLICY
1207 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1208 #else
1209 return 0;
1210 #endif
1211 }
1212
1213 #ifdef CONFIG_XFRM_SUB_POLICY
1214 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1215 {
1216 struct xfrm_userpolicy_type upt = {
1217 .type = type,
1218 };
1219
1220 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1221 }
1222
1223 #else
1224 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1225 {
1226 return 0;
1227 }
1228 #endif
1229
1230 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1231 {
1232 struct xfrm_dump_info *sp = ptr;
1233 struct xfrm_userpolicy_info *p;
1234 struct sk_buff *in_skb = sp->in_skb;
1235 struct sk_buff *skb = sp->out_skb;
1236 struct nlmsghdr *nlh;
1237
1238 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1239 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1240 if (nlh == NULL)
1241 return -EMSGSIZE;
1242
1243 p = nlmsg_data(nlh);
1244 copy_to_user_policy(xp, p, dir);
1245 if (copy_to_user_tmpl(xp, skb) < 0)
1246 goto nlmsg_failure;
1247 if (copy_to_user_sec_ctx(xp, skb))
1248 goto nlmsg_failure;
1249 if (copy_to_user_policy_type(xp->type, skb) < 0)
1250 goto nlmsg_failure;
1251
1252 nlmsg_end(skb, nlh);
1253 return 0;
1254
1255 nlmsg_failure:
1256 nlmsg_cancel(skb, nlh);
1257 return -EMSGSIZE;
1258 }
1259
1260 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1261 {
1262 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1263
1264 xfrm_policy_walk_done(walk);
1265 return 0;
1266 }
1267
1268 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1269 {
1270 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1271 struct xfrm_dump_info info;
1272
1273 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1274 sizeof(cb->args) - sizeof(cb->args[0]));
1275
1276 info.in_skb = cb->skb;
1277 info.out_skb = skb;
1278 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1279 info.nlmsg_flags = NLM_F_MULTI;
1280
1281 if (!cb->args[0]) {
1282 cb->args[0] = 1;
1283 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1284 }
1285
1286 (void) xfrm_policy_walk(walk, dump_one_policy, &info);
1287
1288 return skb->len;
1289 }
1290
1291 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1292 struct xfrm_policy *xp,
1293 int dir, u32 seq)
1294 {
1295 struct xfrm_dump_info info;
1296 struct sk_buff *skb;
1297
1298 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1299 if (!skb)
1300 return ERR_PTR(-ENOMEM);
1301
1302 info.in_skb = in_skb;
1303 info.out_skb = skb;
1304 info.nlmsg_seq = seq;
1305 info.nlmsg_flags = 0;
1306
1307 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1308 kfree_skb(skb);
1309 return NULL;
1310 }
1311
1312 return skb;
1313 }
1314
1315 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1316 struct nlattr **attrs)
1317 {
1318 struct xfrm_policy *xp;
1319 struct xfrm_userpolicy_id *p;
1320 u8 type = XFRM_POLICY_TYPE_MAIN;
1321 int err;
1322 struct km_event c;
1323 int delete;
1324
1325 p = nlmsg_data(nlh);
1326 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1327
1328 err = copy_from_user_policy_type(&type, attrs);
1329 if (err)
1330 return err;
1331
1332 err = verify_policy_dir(p->dir);
1333 if (err)
1334 return err;
1335
1336 if (p->index)
1337 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1338 else {
1339 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1340 struct xfrm_sec_ctx *ctx;
1341
1342 err = verify_sec_ctx_len(attrs);
1343 if (err)
1344 return err;
1345
1346 ctx = NULL;
1347 if (rt) {
1348 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1349
1350 err = security_xfrm_policy_alloc(&ctx, uctx);
1351 if (err)
1352 return err;
1353 }
1354 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx,
1355 delete, &err);
1356 security_xfrm_policy_free(ctx);
1357 }
1358 if (xp == NULL)
1359 return -ENOENT;
1360
1361 if (!delete) {
1362 struct sk_buff *resp_skb;
1363
1364 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1365 if (IS_ERR(resp_skb)) {
1366 err = PTR_ERR(resp_skb);
1367 } else {
1368 err = nlmsg_unicast(xfrm_nl, resp_skb,
1369 NETLINK_CB(skb).pid);
1370 }
1371 } else {
1372 xfrm_audit_policy_delete(xp, err ? 0 : 1,
1373 NETLINK_CB(skb).loginuid,
1374 NETLINK_CB(skb).sid);
1375
1376 if (err != 0)
1377 goto out;
1378
1379 c.data.byid = p->index;
1380 c.event = nlh->nlmsg_type;
1381 c.seq = nlh->nlmsg_seq;
1382 c.pid = nlh->nlmsg_pid;
1383 km_policy_notify(xp, p->dir, &c);
1384 }
1385
1386 out:
1387 xfrm_pol_put(xp);
1388 return err;
1389 }
1390
1391 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1392 struct nlattr **attrs)
1393 {
1394 struct km_event c;
1395 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1396 struct xfrm_audit audit_info;
1397 int err;
1398
1399 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1400 audit_info.secid = NETLINK_CB(skb).sid;
1401 err = xfrm_state_flush(p->proto, &audit_info);
1402 if (err)
1403 return err;
1404 c.data.proto = p->proto;
1405 c.event = nlh->nlmsg_type;
1406 c.seq = nlh->nlmsg_seq;
1407 c.pid = nlh->nlmsg_pid;
1408 km_state_notify(NULL, &c);
1409
1410 return 0;
1411 }
1412
1413 static inline size_t xfrm_aevent_msgsize(void)
1414 {
1415 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1416 + nla_total_size(sizeof(struct xfrm_replay_state))
1417 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1418 + nla_total_size(4) /* XFRM_AE_RTHR */
1419 + nla_total_size(4); /* XFRM_AE_ETHR */
1420 }
1421
1422 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1423 {
1424 struct xfrm_aevent_id *id;
1425 struct nlmsghdr *nlh;
1426
1427 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1428 if (nlh == NULL)
1429 return -EMSGSIZE;
1430
1431 id = nlmsg_data(nlh);
1432 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1433 id->sa_id.spi = x->id.spi;
1434 id->sa_id.family = x->props.family;
1435 id->sa_id.proto = x->id.proto;
1436 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1437 id->reqid = x->props.reqid;
1438 id->flags = c->data.aevent;
1439
1440 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1441 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1442
1443 if (id->flags & XFRM_AE_RTHR)
1444 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1445
1446 if (id->flags & XFRM_AE_ETHR)
1447 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1448 x->replay_maxage * 10 / HZ);
1449
1450 return nlmsg_end(skb, nlh);
1451
1452 nla_put_failure:
1453 nlmsg_cancel(skb, nlh);
1454 return -EMSGSIZE;
1455 }
1456
1457 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1458 struct nlattr **attrs)
1459 {
1460 struct xfrm_state *x;
1461 struct sk_buff *r_skb;
1462 int err;
1463 struct km_event c;
1464 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1465 struct xfrm_usersa_id *id = &p->sa_id;
1466
1467 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1468 if (r_skb == NULL)
1469 return -ENOMEM;
1470
1471 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1472 if (x == NULL) {
1473 kfree_skb(r_skb);
1474 return -ESRCH;
1475 }
1476
1477 /*
1478 * XXX: is this lock really needed - none of the other
1479 * gets lock (the concern is things getting updated
1480 * while we are still reading) - jhs
1481 */
1482 spin_lock_bh(&x->lock);
1483 c.data.aevent = p->flags;
1484 c.seq = nlh->nlmsg_seq;
1485 c.pid = nlh->nlmsg_pid;
1486
1487 if (build_aevent(r_skb, x, &c) < 0)
1488 BUG();
1489 err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
1490 spin_unlock_bh(&x->lock);
1491 xfrm_state_put(x);
1492 return err;
1493 }
1494
1495 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1496 struct nlattr **attrs)
1497 {
1498 struct xfrm_state *x;
1499 struct km_event c;
1500 int err = - EINVAL;
1501 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1502 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1503 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1504
1505 if (!lt && !rp)
1506 return err;
1507
1508 /* pedantic mode - thou shalt sayeth replaceth */
1509 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1510 return err;
1511
1512 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1513 if (x == NULL)
1514 return -ESRCH;
1515
1516 if (x->km.state != XFRM_STATE_VALID)
1517 goto out;
1518
1519 spin_lock_bh(&x->lock);
1520 xfrm_update_ae_params(x, attrs);
1521 spin_unlock_bh(&x->lock);
1522
1523 c.event = nlh->nlmsg_type;
1524 c.seq = nlh->nlmsg_seq;
1525 c.pid = nlh->nlmsg_pid;
1526 c.data.aevent = XFRM_AE_CU;
1527 km_state_notify(x, &c);
1528 err = 0;
1529 out:
1530 xfrm_state_put(x);
1531 return err;
1532 }
1533
1534 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1535 struct nlattr **attrs)
1536 {
1537 struct km_event c;
1538 u8 type = XFRM_POLICY_TYPE_MAIN;
1539 int err;
1540 struct xfrm_audit audit_info;
1541
1542 err = copy_from_user_policy_type(&type, attrs);
1543 if (err)
1544 return err;
1545
1546 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1547 audit_info.secid = NETLINK_CB(skb).sid;
1548 err = xfrm_policy_flush(type, &audit_info);
1549 if (err)
1550 return err;
1551 c.data.type = type;
1552 c.event = nlh->nlmsg_type;
1553 c.seq = nlh->nlmsg_seq;
1554 c.pid = nlh->nlmsg_pid;
1555 km_policy_notify(NULL, 0, &c);
1556 return 0;
1557 }
1558
1559 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1560 struct nlattr **attrs)
1561 {
1562 struct xfrm_policy *xp;
1563 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1564 struct xfrm_userpolicy_info *p = &up->pol;
1565 u8 type = XFRM_POLICY_TYPE_MAIN;
1566 int err = -ENOENT;
1567
1568 err = copy_from_user_policy_type(&type, attrs);
1569 if (err)
1570 return err;
1571
1572 if (p->index)
1573 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1574 else {
1575 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1576 struct xfrm_sec_ctx *ctx;
1577
1578 err = verify_sec_ctx_len(attrs);
1579 if (err)
1580 return err;
1581
1582 ctx = NULL;
1583 if (rt) {
1584 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1585
1586 err = security_xfrm_policy_alloc(&ctx, uctx);
1587 if (err)
1588 return err;
1589 }
1590 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx, 0, &err);
1591 security_xfrm_policy_free(ctx);
1592 }
1593 if (xp == NULL)
1594 return -ENOENT;
1595
1596 read_lock(&xp->lock);
1597 if (xp->dead) {
1598 read_unlock(&xp->lock);
1599 goto out;
1600 }
1601
1602 read_unlock(&xp->lock);
1603 err = 0;
1604 if (up->hard) {
1605 xfrm_policy_delete(xp, p->dir);
1606 xfrm_audit_policy_delete(xp, 1, NETLINK_CB(skb).loginuid,
1607 NETLINK_CB(skb).sid);
1608
1609 } else {
1610 // reset the timers here?
1611 printk("Dont know what to do with soft policy expire\n");
1612 }
1613 km_policy_expired(xp, p->dir, up->hard, current->pid);
1614
1615 out:
1616 xfrm_pol_put(xp);
1617 return err;
1618 }
1619
1620 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1621 struct nlattr **attrs)
1622 {
1623 struct xfrm_state *x;
1624 int err;
1625 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1626 struct xfrm_usersa_info *p = &ue->state;
1627
1628 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1629
1630 err = -ENOENT;
1631 if (x == NULL)
1632 return err;
1633
1634 spin_lock_bh(&x->lock);
1635 err = -EINVAL;
1636 if (x->km.state != XFRM_STATE_VALID)
1637 goto out;
1638 km_state_expired(x, ue->hard, current->pid);
1639
1640 if (ue->hard) {
1641 __xfrm_state_delete(x);
1642 xfrm_audit_state_delete(x, 1, NETLINK_CB(skb).loginuid,
1643 NETLINK_CB(skb).sid);
1644 }
1645 err = 0;
1646 out:
1647 spin_unlock_bh(&x->lock);
1648 xfrm_state_put(x);
1649 return err;
1650 }
1651
1652 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1653 struct nlattr **attrs)
1654 {
1655 struct xfrm_policy *xp;
1656 struct xfrm_user_tmpl *ut;
1657 int i;
1658 struct nlattr *rt = attrs[XFRMA_TMPL];
1659
1660 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1661 struct xfrm_state *x = xfrm_state_alloc();
1662 int err = -ENOMEM;
1663
1664 if (!x)
1665 return err;
1666
1667 err = verify_newpolicy_info(&ua->policy);
1668 if (err) {
1669 printk("BAD policy passed\n");
1670 kfree(x);
1671 return err;
1672 }
1673
1674 /* build an XP */
1675 xp = xfrm_policy_construct(&ua->policy, attrs, &err);
1676 if (!xp) {
1677 kfree(x);
1678 return err;
1679 }
1680
1681 memcpy(&x->id, &ua->id, sizeof(ua->id));
1682 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1683 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1684
1685 ut = nla_data(rt);
1686 /* extract the templates and for each call km_key */
1687 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1688 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1689 memcpy(&x->id, &t->id, sizeof(x->id));
1690 x->props.mode = t->mode;
1691 x->props.reqid = t->reqid;
1692 x->props.family = ut->family;
1693 t->aalgos = ua->aalgos;
1694 t->ealgos = ua->ealgos;
1695 t->calgos = ua->calgos;
1696 err = km_query(x, t, xp);
1697
1698 }
1699
1700 kfree(x);
1701 kfree(xp);
1702
1703 return 0;
1704 }
1705
1706 #ifdef CONFIG_XFRM_MIGRATE
1707 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1708 struct nlattr **attrs, int *num)
1709 {
1710 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1711 struct xfrm_user_migrate *um;
1712 int i, num_migrate;
1713
1714 um = nla_data(rt);
1715 num_migrate = nla_len(rt) / sizeof(*um);
1716
1717 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1718 return -EINVAL;
1719
1720 for (i = 0; i < num_migrate; i++, um++, ma++) {
1721 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1722 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1723 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1724 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1725
1726 ma->proto = um->proto;
1727 ma->mode = um->mode;
1728 ma->reqid = um->reqid;
1729
1730 ma->old_family = um->old_family;
1731 ma->new_family = um->new_family;
1732 }
1733
1734 *num = i;
1735 return 0;
1736 }
1737
1738 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1739 struct nlattr **attrs)
1740 {
1741 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1742 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1743 u8 type;
1744 int err;
1745 int n = 0;
1746
1747 if (attrs[XFRMA_MIGRATE] == NULL)
1748 return -EINVAL;
1749
1750 err = copy_from_user_policy_type(&type, attrs);
1751 if (err)
1752 return err;
1753
1754 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1755 attrs, &n);
1756 if (err)
1757 return err;
1758
1759 if (!n)
1760 return 0;
1761
1762 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1763
1764 return 0;
1765 }
1766 #else
1767 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1768 struct nlattr **attrs)
1769 {
1770 return -ENOPROTOOPT;
1771 }
1772 #endif
1773
1774 #ifdef CONFIG_XFRM_MIGRATE
1775 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1776 {
1777 struct xfrm_user_migrate um;
1778
1779 memset(&um, 0, sizeof(um));
1780 um.proto = m->proto;
1781 um.mode = m->mode;
1782 um.reqid = m->reqid;
1783 um.old_family = m->old_family;
1784 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1785 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1786 um.new_family = m->new_family;
1787 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1788 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1789
1790 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1791 }
1792
1793 static inline size_t xfrm_migrate_msgsize(int num_migrate)
1794 {
1795 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1796 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1797 + userpolicy_type_attrsize();
1798 }
1799
1800 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1801 int num_migrate, struct xfrm_selector *sel,
1802 u8 dir, u8 type)
1803 {
1804 struct xfrm_migrate *mp;
1805 struct xfrm_userpolicy_id *pol_id;
1806 struct nlmsghdr *nlh;
1807 int i;
1808
1809 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1810 if (nlh == NULL)
1811 return -EMSGSIZE;
1812
1813 pol_id = nlmsg_data(nlh);
1814 /* copy data from selector, dir, and type to the pol_id */
1815 memset(pol_id, 0, sizeof(*pol_id));
1816 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1817 pol_id->dir = dir;
1818
1819 if (copy_to_user_policy_type(type, skb) < 0)
1820 goto nlmsg_failure;
1821
1822 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1823 if (copy_to_user_migrate(mp, skb) < 0)
1824 goto nlmsg_failure;
1825 }
1826
1827 return nlmsg_end(skb, nlh);
1828 nlmsg_failure:
1829 nlmsg_cancel(skb, nlh);
1830 return -EMSGSIZE;
1831 }
1832
1833 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1834 struct xfrm_migrate *m, int num_migrate)
1835 {
1836 struct sk_buff *skb;
1837
1838 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
1839 if (skb == NULL)
1840 return -ENOMEM;
1841
1842 /* build migrate */
1843 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1844 BUG();
1845
1846 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
1847 }
1848 #else
1849 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1850 struct xfrm_migrate *m, int num_migrate)
1851 {
1852 return -ENOPROTOOPT;
1853 }
1854 #endif
1855
1856 #define XMSGSIZE(type) sizeof(struct type)
1857
1858 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1859 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1860 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1861 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1862 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1863 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1864 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1865 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1866 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1867 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1868 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1869 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1870 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1871 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1872 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
1873 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1874 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1875 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1876 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1877 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
1878 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1879 };
1880
1881 #undef XMSGSIZE
1882
1883 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1884 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
1885 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
1886 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
1887 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
1888 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
1889 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
1890 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
1891 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
1892 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
1893 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
1894 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
1895 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
1896 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
1897 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
1898 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
1899 };
1900
1901 static struct xfrm_link {
1902 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1903 int (*dump)(struct sk_buff *, struct netlink_callback *);
1904 int (*done)(struct netlink_callback *);
1905 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1906 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1907 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1908 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1909 .dump = xfrm_dump_sa,
1910 .done = xfrm_dump_sa_done },
1911 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1912 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1913 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1914 .dump = xfrm_dump_policy,
1915 .done = xfrm_dump_policy_done },
1916 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1917 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1918 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1919 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1920 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1921 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1922 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1923 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1924 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1925 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1926 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1927 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1928 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1929 };
1930
1931 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1932 {
1933 struct nlattr *attrs[XFRMA_MAX+1];
1934 struct xfrm_link *link;
1935 int type, err;
1936
1937 type = nlh->nlmsg_type;
1938 if (type > XFRM_MSG_MAX)
1939 return -EINVAL;
1940
1941 type -= XFRM_MSG_BASE;
1942 link = &xfrm_dispatch[type];
1943
1944 /* All operations require privileges, even GET */
1945 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1946 return -EPERM;
1947
1948 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1949 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1950 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1951 if (link->dump == NULL)
1952 return -EINVAL;
1953
1954 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, link->done);
1955 }
1956
1957 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
1958 xfrma_policy);
1959 if (err < 0)
1960 return err;
1961
1962 if (link->doit == NULL)
1963 return -EINVAL;
1964
1965 return link->doit(skb, nlh, attrs);
1966 }
1967
1968 static void xfrm_netlink_rcv(struct sk_buff *skb)
1969 {
1970 mutex_lock(&xfrm_cfg_mutex);
1971 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
1972 mutex_unlock(&xfrm_cfg_mutex);
1973 }
1974
1975 static inline size_t xfrm_expire_msgsize(void)
1976 {
1977 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
1978 }
1979
1980 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1981 {
1982 struct xfrm_user_expire *ue;
1983 struct nlmsghdr *nlh;
1984
1985 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
1986 if (nlh == NULL)
1987 return -EMSGSIZE;
1988
1989 ue = nlmsg_data(nlh);
1990 copy_to_user_state(x, &ue->state);
1991 ue->hard = (c->data.hard != 0) ? 1 : 0;
1992
1993 return nlmsg_end(skb, nlh);
1994 }
1995
1996 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1997 {
1998 struct sk_buff *skb;
1999
2000 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2001 if (skb == NULL)
2002 return -ENOMEM;
2003
2004 if (build_expire(skb, x, c) < 0)
2005 BUG();
2006
2007 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2008 }
2009
2010 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2011 {
2012 struct sk_buff *skb;
2013
2014 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2015 if (skb == NULL)
2016 return -ENOMEM;
2017
2018 if (build_aevent(skb, x, c) < 0)
2019 BUG();
2020
2021 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2022 }
2023
2024 static int xfrm_notify_sa_flush(struct km_event *c)
2025 {
2026 struct xfrm_usersa_flush *p;
2027 struct nlmsghdr *nlh;
2028 struct sk_buff *skb;
2029 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2030
2031 skb = nlmsg_new(len, GFP_ATOMIC);
2032 if (skb == NULL)
2033 return -ENOMEM;
2034
2035 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2036 if (nlh == NULL) {
2037 kfree_skb(skb);
2038 return -EMSGSIZE;
2039 }
2040
2041 p = nlmsg_data(nlh);
2042 p->proto = c->data.proto;
2043
2044 nlmsg_end(skb, nlh);
2045
2046 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2047 }
2048
2049 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2050 {
2051 size_t l = 0;
2052 if (x->aead)
2053 l += nla_total_size(aead_len(x->aead));
2054 if (x->aalg)
2055 l += nla_total_size(xfrm_alg_len(x->aalg));
2056 if (x->ealg)
2057 l += nla_total_size(xfrm_alg_len(x->ealg));
2058 if (x->calg)
2059 l += nla_total_size(sizeof(*x->calg));
2060 if (x->encap)
2061 l += nla_total_size(sizeof(*x->encap));
2062 if (x->security)
2063 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2064 x->security->ctx_len);
2065 if (x->coaddr)
2066 l += nla_total_size(sizeof(*x->coaddr));
2067
2068 /* Must count x->lastused as it may become non-zero behind our back. */
2069 l += nla_total_size(sizeof(u64));
2070
2071 return l;
2072 }
2073
2074 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2075 {
2076 struct xfrm_usersa_info *p;
2077 struct xfrm_usersa_id *id;
2078 struct nlmsghdr *nlh;
2079 struct sk_buff *skb;
2080 int len = xfrm_sa_len(x);
2081 int headlen;
2082
2083 headlen = sizeof(*p);
2084 if (c->event == XFRM_MSG_DELSA) {
2085 len += nla_total_size(headlen);
2086 headlen = sizeof(*id);
2087 }
2088 len += NLMSG_ALIGN(headlen);
2089
2090 skb = nlmsg_new(len, GFP_ATOMIC);
2091 if (skb == NULL)
2092 return -ENOMEM;
2093
2094 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2095 if (nlh == NULL)
2096 goto nla_put_failure;
2097
2098 p = nlmsg_data(nlh);
2099 if (c->event == XFRM_MSG_DELSA) {
2100 struct nlattr *attr;
2101
2102 id = nlmsg_data(nlh);
2103 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2104 id->spi = x->id.spi;
2105 id->family = x->props.family;
2106 id->proto = x->id.proto;
2107
2108 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2109 if (attr == NULL)
2110 goto nla_put_failure;
2111
2112 p = nla_data(attr);
2113 }
2114
2115 if (copy_to_user_state_extra(x, p, skb))
2116 goto nla_put_failure;
2117
2118 nlmsg_end(skb, nlh);
2119
2120 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2121
2122 nla_put_failure:
2123 /* Somebody screwed up with xfrm_sa_len! */
2124 WARN_ON(1);
2125 kfree_skb(skb);
2126 return -1;
2127 }
2128
2129 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2130 {
2131
2132 switch (c->event) {
2133 case XFRM_MSG_EXPIRE:
2134 return xfrm_exp_state_notify(x, c);
2135 case XFRM_MSG_NEWAE:
2136 return xfrm_aevent_state_notify(x, c);
2137 case XFRM_MSG_DELSA:
2138 case XFRM_MSG_UPDSA:
2139 case XFRM_MSG_NEWSA:
2140 return xfrm_notify_sa(x, c);
2141 case XFRM_MSG_FLUSHSA:
2142 return xfrm_notify_sa_flush(c);
2143 default:
2144 printk("xfrm_user: Unknown SA event %d\n", c->event);
2145 break;
2146 }
2147
2148 return 0;
2149
2150 }
2151
2152 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2153 struct xfrm_policy *xp)
2154 {
2155 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2156 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2157 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2158 + userpolicy_type_attrsize();
2159 }
2160
2161 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2162 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2163 int dir)
2164 {
2165 struct xfrm_user_acquire *ua;
2166 struct nlmsghdr *nlh;
2167 __u32 seq = xfrm_get_acqseq();
2168
2169 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2170 if (nlh == NULL)
2171 return -EMSGSIZE;
2172
2173 ua = nlmsg_data(nlh);
2174 memcpy(&ua->id, &x->id, sizeof(ua->id));
2175 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2176 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2177 copy_to_user_policy(xp, &ua->policy, dir);
2178 ua->aalgos = xt->aalgos;
2179 ua->ealgos = xt->ealgos;
2180 ua->calgos = xt->calgos;
2181 ua->seq = x->km.seq = seq;
2182
2183 if (copy_to_user_tmpl(xp, skb) < 0)
2184 goto nlmsg_failure;
2185 if (copy_to_user_state_sec_ctx(x, skb))
2186 goto nlmsg_failure;
2187 if (copy_to_user_policy_type(xp->type, skb) < 0)
2188 goto nlmsg_failure;
2189
2190 return nlmsg_end(skb, nlh);
2191
2192 nlmsg_failure:
2193 nlmsg_cancel(skb, nlh);
2194 return -EMSGSIZE;
2195 }
2196
2197 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2198 struct xfrm_policy *xp, int dir)
2199 {
2200 struct sk_buff *skb;
2201
2202 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2203 if (skb == NULL)
2204 return -ENOMEM;
2205
2206 if (build_acquire(skb, x, xt, xp, dir) < 0)
2207 BUG();
2208
2209 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2210 }
2211
2212 /* User gives us xfrm_user_policy_info followed by an array of 0
2213 * or more templates.
2214 */
2215 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2216 u8 *data, int len, int *dir)
2217 {
2218 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2219 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2220 struct xfrm_policy *xp;
2221 int nr;
2222
2223 switch (sk->sk_family) {
2224 case AF_INET:
2225 if (opt != IP_XFRM_POLICY) {
2226 *dir = -EOPNOTSUPP;
2227 return NULL;
2228 }
2229 break;
2230 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2231 case AF_INET6:
2232 if (opt != IPV6_XFRM_POLICY) {
2233 *dir = -EOPNOTSUPP;
2234 return NULL;
2235 }
2236 break;
2237 #endif
2238 default:
2239 *dir = -EINVAL;
2240 return NULL;
2241 }
2242
2243 *dir = -EINVAL;
2244
2245 if (len < sizeof(*p) ||
2246 verify_newpolicy_info(p))
2247 return NULL;
2248
2249 nr = ((len - sizeof(*p)) / sizeof(*ut));
2250 if (validate_tmpl(nr, ut, p->sel.family))
2251 return NULL;
2252
2253 if (p->dir > XFRM_POLICY_OUT)
2254 return NULL;
2255
2256 xp = xfrm_policy_alloc(GFP_KERNEL);
2257 if (xp == NULL) {
2258 *dir = -ENOBUFS;
2259 return NULL;
2260 }
2261
2262 copy_from_user_policy(xp, p);
2263 xp->type = XFRM_POLICY_TYPE_MAIN;
2264 copy_templates(xp, ut, nr);
2265
2266 *dir = p->dir;
2267
2268 return xp;
2269 }
2270
2271 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2272 {
2273 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2274 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2275 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2276 + userpolicy_type_attrsize();
2277 }
2278
2279 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2280 int dir, struct km_event *c)
2281 {
2282 struct xfrm_user_polexpire *upe;
2283 struct nlmsghdr *nlh;
2284 int hard = c->data.hard;
2285
2286 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2287 if (nlh == NULL)
2288 return -EMSGSIZE;
2289
2290 upe = nlmsg_data(nlh);
2291 copy_to_user_policy(xp, &upe->pol, dir);
2292 if (copy_to_user_tmpl(xp, skb) < 0)
2293 goto nlmsg_failure;
2294 if (copy_to_user_sec_ctx(xp, skb))
2295 goto nlmsg_failure;
2296 if (copy_to_user_policy_type(xp->type, skb) < 0)
2297 goto nlmsg_failure;
2298 upe->hard = !!hard;
2299
2300 return nlmsg_end(skb, nlh);
2301
2302 nlmsg_failure:
2303 nlmsg_cancel(skb, nlh);
2304 return -EMSGSIZE;
2305 }
2306
2307 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2308 {
2309 struct sk_buff *skb;
2310
2311 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2312 if (skb == NULL)
2313 return -ENOMEM;
2314
2315 if (build_polexpire(skb, xp, dir, c) < 0)
2316 BUG();
2317
2318 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2319 }
2320
2321 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2322 {
2323 struct xfrm_userpolicy_info *p;
2324 struct xfrm_userpolicy_id *id;
2325 struct nlmsghdr *nlh;
2326 struct sk_buff *skb;
2327 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2328 int headlen;
2329
2330 headlen = sizeof(*p);
2331 if (c->event == XFRM_MSG_DELPOLICY) {
2332 len += nla_total_size(headlen);
2333 headlen = sizeof(*id);
2334 }
2335 len += userpolicy_type_attrsize();
2336 len += NLMSG_ALIGN(headlen);
2337
2338 skb = nlmsg_new(len, GFP_ATOMIC);
2339 if (skb == NULL)
2340 return -ENOMEM;
2341
2342 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2343 if (nlh == NULL)
2344 goto nlmsg_failure;
2345
2346 p = nlmsg_data(nlh);
2347 if (c->event == XFRM_MSG_DELPOLICY) {
2348 struct nlattr *attr;
2349
2350 id = nlmsg_data(nlh);
2351 memset(id, 0, sizeof(*id));
2352 id->dir = dir;
2353 if (c->data.byid)
2354 id->index = xp->index;
2355 else
2356 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2357
2358 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2359 if (attr == NULL)
2360 goto nlmsg_failure;
2361
2362 p = nla_data(attr);
2363 }
2364
2365 copy_to_user_policy(xp, p, dir);
2366 if (copy_to_user_tmpl(xp, skb) < 0)
2367 goto nlmsg_failure;
2368 if (copy_to_user_policy_type(xp->type, skb) < 0)
2369 goto nlmsg_failure;
2370
2371 nlmsg_end(skb, nlh);
2372
2373 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2374
2375 nlmsg_failure:
2376 kfree_skb(skb);
2377 return -1;
2378 }
2379
2380 static int xfrm_notify_policy_flush(struct km_event *c)
2381 {
2382 struct nlmsghdr *nlh;
2383 struct sk_buff *skb;
2384
2385 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2386 if (skb == NULL)
2387 return -ENOMEM;
2388
2389 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2390 if (nlh == NULL)
2391 goto nlmsg_failure;
2392 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2393 goto nlmsg_failure;
2394
2395 nlmsg_end(skb, nlh);
2396
2397 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2398
2399 nlmsg_failure:
2400 kfree_skb(skb);
2401 return -1;
2402 }
2403
2404 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2405 {
2406
2407 switch (c->event) {
2408 case XFRM_MSG_NEWPOLICY:
2409 case XFRM_MSG_UPDPOLICY:
2410 case XFRM_MSG_DELPOLICY:
2411 return xfrm_notify_policy(xp, dir, c);
2412 case XFRM_MSG_FLUSHPOLICY:
2413 return xfrm_notify_policy_flush(c);
2414 case XFRM_MSG_POLEXPIRE:
2415 return xfrm_exp_policy_notify(xp, dir, c);
2416 default:
2417 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2418 }
2419
2420 return 0;
2421
2422 }
2423
2424 static inline size_t xfrm_report_msgsize(void)
2425 {
2426 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2427 }
2428
2429 static int build_report(struct sk_buff *skb, u8 proto,
2430 struct xfrm_selector *sel, xfrm_address_t *addr)
2431 {
2432 struct xfrm_user_report *ur;
2433 struct nlmsghdr *nlh;
2434
2435 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2436 if (nlh == NULL)
2437 return -EMSGSIZE;
2438
2439 ur = nlmsg_data(nlh);
2440 ur->proto = proto;
2441 memcpy(&ur->sel, sel, sizeof(ur->sel));
2442
2443 if (addr)
2444 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2445
2446 return nlmsg_end(skb, nlh);
2447
2448 nla_put_failure:
2449 nlmsg_cancel(skb, nlh);
2450 return -EMSGSIZE;
2451 }
2452
2453 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2454 xfrm_address_t *addr)
2455 {
2456 struct sk_buff *skb;
2457
2458 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2459 if (skb == NULL)
2460 return -ENOMEM;
2461
2462 if (build_report(skb, proto, sel, addr) < 0)
2463 BUG();
2464
2465 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2466 }
2467
2468 static struct xfrm_mgr netlink_mgr = {
2469 .id = "netlink",
2470 .notify = xfrm_send_state_notify,
2471 .acquire = xfrm_send_acquire,
2472 .compile_policy = xfrm_compile_policy,
2473 .notify_policy = xfrm_send_policy_notify,
2474 .report = xfrm_send_report,
2475 .migrate = xfrm_send_migrate,
2476 };
2477
2478 static int __init xfrm_user_init(void)
2479 {
2480 struct sock *nlsk;
2481
2482 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2483
2484 nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
2485 xfrm_netlink_rcv, NULL, THIS_MODULE);
2486 if (nlsk == NULL)
2487 return -ENOMEM;
2488 rcu_assign_pointer(xfrm_nl, nlsk);
2489
2490 xfrm_register_km(&netlink_mgr);
2491
2492 return 0;
2493 }
2494
2495 static void __exit xfrm_user_exit(void)
2496 {
2497 struct sock *nlsk = xfrm_nl;
2498
2499 xfrm_unregister_km(&netlink_mgr);
2500 rcu_assign_pointer(xfrm_nl, NULL);
2501 synchronize_rcu();
2502 netlink_kernel_release(nlsk);
2503 }
2504
2505 module_init(xfrm_user_init);
2506 module_exit(xfrm_user_exit);
2507 MODULE_LICENSE("GPL");
2508 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2509
Linux kernel - Deliverables
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