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powerpc: Fix missing 'blr' in _tlbia()
[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 case XFRMA_ALG_CRYPT:
54 case XFRMA_ALG_COMP:
55 break;
56
57 default:
58 return -EINVAL;
59 }
60
61 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
62 return 0;
63 }
64
65 static int verify_aead(struct nlattr **attrs)
66 {
67 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
68 struct xfrm_algo_aead *algp;
69
70 if (!rt)
71 return 0;
72
73 algp = nla_data(rt);
74 if (nla_len(rt) < aead_len(algp))
75 return -EINVAL;
76
77 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
78 return 0;
79 }
80
81 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
82 xfrm_address_t **addrp)
83 {
84 struct nlattr *rt = attrs[type];
85
86 if (rt && addrp)
87 *addrp = nla_data(rt);
88 }
89
90 static inline int verify_sec_ctx_len(struct nlattr **attrs)
91 {
92 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
93 struct xfrm_user_sec_ctx *uctx;
94
95 if (!rt)
96 return 0;
97
98 uctx = nla_data(rt);
99 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
100 return -EINVAL;
101
102 return 0;
103 }
104
105
106 static int verify_newsa_info(struct xfrm_usersa_info *p,
107 struct nlattr **attrs)
108 {
109 int err;
110
111 err = -EINVAL;
112 switch (p->family) {
113 case AF_INET:
114 break;
115
116 case AF_INET6:
117 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
118 break;
119 #else
120 err = -EAFNOSUPPORT;
121 goto out;
122 #endif
123
124 default:
125 goto out;
126 }
127
128 err = -EINVAL;
129 switch (p->id.proto) {
130 case IPPROTO_AH:
131 if (!attrs[XFRMA_ALG_AUTH] ||
132 attrs[XFRMA_ALG_AEAD] ||
133 attrs[XFRMA_ALG_CRYPT] ||
134 attrs[XFRMA_ALG_COMP])
135 goto out;
136 break;
137
138 case IPPROTO_ESP:
139 if (attrs[XFRMA_ALG_COMP])
140 goto out;
141 if (!attrs[XFRMA_ALG_AUTH] &&
142 !attrs[XFRMA_ALG_CRYPT] &&
143 !attrs[XFRMA_ALG_AEAD])
144 goto out;
145 if ((attrs[XFRMA_ALG_AUTH] ||
146 attrs[XFRMA_ALG_CRYPT]) &&
147 attrs[XFRMA_ALG_AEAD])
148 goto out;
149 break;
150
151 case IPPROTO_COMP:
152 if (!attrs[XFRMA_ALG_COMP] ||
153 attrs[XFRMA_ALG_AEAD] ||
154 attrs[XFRMA_ALG_AUTH] ||
155 attrs[XFRMA_ALG_CRYPT])
156 goto out;
157 break;
158
159 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
160 case IPPROTO_DSTOPTS:
161 case IPPROTO_ROUTING:
162 if (attrs[XFRMA_ALG_COMP] ||
163 attrs[XFRMA_ALG_AUTH] ||
164 attrs[XFRMA_ALG_AEAD] ||
165 attrs[XFRMA_ALG_CRYPT] ||
166 attrs[XFRMA_ENCAP] ||
167 attrs[XFRMA_SEC_CTX] ||
168 !attrs[XFRMA_COADDR])
169 goto out;
170 break;
171 #endif
172
173 default:
174 goto out;
175 }
176
177 if ((err = verify_aead(attrs)))
178 goto out;
179 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
180 goto out;
181 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
182 goto out;
183 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
184 goto out;
185 if ((err = verify_sec_ctx_len(attrs)))
186 goto out;
187
188 err = -EINVAL;
189 switch (p->mode) {
190 case XFRM_MODE_TRANSPORT:
191 case XFRM_MODE_TUNNEL:
192 case XFRM_MODE_ROUTEOPTIMIZATION:
193 case XFRM_MODE_BEET:
194 break;
195
196 default:
197 goto out;
198 }
199
200 err = 0;
201
202 out:
203 return err;
204 }
205
206 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
207 struct xfrm_algo_desc *(*get_byname)(char *, int),
208 struct nlattr *rta)
209 {
210 struct xfrm_algo *p, *ualg;
211 struct xfrm_algo_desc *algo;
212
213 if (!rta)
214 return 0;
215
216 ualg = nla_data(rta);
217
218 algo = get_byname(ualg->alg_name, 1);
219 if (!algo)
220 return -ENOSYS;
221 *props = algo->desc.sadb_alg_id;
222
223 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
224 if (!p)
225 return -ENOMEM;
226
227 strcpy(p->alg_name, algo->name);
228 *algpp = p;
229 return 0;
230 }
231
232 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
233 struct nlattr *rta)
234 {
235 struct xfrm_algo_aead *p, *ualg;
236 struct xfrm_algo_desc *algo;
237
238 if (!rta)
239 return 0;
240
241 ualg = nla_data(rta);
242
243 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
244 if (!algo)
245 return -ENOSYS;
246 *props = algo->desc.sadb_alg_id;
247
248 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
249 if (!p)
250 return -ENOMEM;
251
252 strcpy(p->alg_name, algo->name);
253 *algpp = p;
254 return 0;
255 }
256
257 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
258 {
259 int len = 0;
260
261 if (xfrm_ctx) {
262 len += sizeof(struct xfrm_user_sec_ctx);
263 len += xfrm_ctx->ctx_len;
264 }
265 return len;
266 }
267
268 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
269 {
270 memcpy(&x->id, &p->id, sizeof(x->id));
271 memcpy(&x->sel, &p->sel, sizeof(x->sel));
272 memcpy(&x->lft, &p->lft, sizeof(x->lft));
273 x->props.mode = p->mode;
274 x->props.replay_window = p->replay_window;
275 x->props.reqid = p->reqid;
276 x->props.family = p->family;
277 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
278 x->props.flags = p->flags;
279
280 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
281 x->sel.family = p->family;
282 }
283
284 /*
285 * someday when pfkey also has support, we could have the code
286 * somehow made shareable and move it to xfrm_state.c - JHS
287 *
288 */
289 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
290 {
291 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
292 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
293 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
294 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
295
296 if (rp) {
297 struct xfrm_replay_state *replay;
298 replay = nla_data(rp);
299 memcpy(&x->replay, replay, sizeof(*replay));
300 memcpy(&x->preplay, replay, sizeof(*replay));
301 }
302
303 if (lt) {
304 struct xfrm_lifetime_cur *ltime;
305 ltime = nla_data(lt);
306 x->curlft.bytes = ltime->bytes;
307 x->curlft.packets = ltime->packets;
308 x->curlft.add_time = ltime->add_time;
309 x->curlft.use_time = ltime->use_time;
310 }
311
312 if (et)
313 x->replay_maxage = nla_get_u32(et);
314
315 if (rt)
316 x->replay_maxdiff = nla_get_u32(rt);
317 }
318
319 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
320 struct nlattr **attrs,
321 int *errp)
322 {
323 struct xfrm_state *x = xfrm_state_alloc();
324 int err = -ENOMEM;
325
326 if (!x)
327 goto error_no_put;
328
329 copy_from_user_state(x, p);
330
331 if ((err = attach_aead(&x->aead, &x->props.ealgo,
332 attrs[XFRMA_ALG_AEAD])))
333 goto error;
334 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
335 xfrm_aalg_get_byname,
336 attrs[XFRMA_ALG_AUTH])))
337 goto error;
338 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
339 xfrm_ealg_get_byname,
340 attrs[XFRMA_ALG_CRYPT])))
341 goto error;
342 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
343 xfrm_calg_get_byname,
344 attrs[XFRMA_ALG_COMP])))
345 goto error;
346
347 if (attrs[XFRMA_ENCAP]) {
348 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
349 sizeof(*x->encap), GFP_KERNEL);
350 if (x->encap == NULL)
351 goto error;
352 }
353
354 if (attrs[XFRMA_COADDR]) {
355 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
356 sizeof(*x->coaddr), GFP_KERNEL);
357 if (x->coaddr == NULL)
358 goto error;
359 }
360
361 err = xfrm_init_state(x);
362 if (err)
363 goto error;
364
365 if (attrs[XFRMA_SEC_CTX] &&
366 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
367 goto error;
368
369 x->km.seq = p->seq;
370 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
371 /* sysctl_xfrm_aevent_etime is in 100ms units */
372 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
373 x->preplay.bitmap = 0;
374 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
375 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
376
377 /* override default values from above */
378
379 xfrm_update_ae_params(x, attrs);
380
381 return x;
382
383 error:
384 x->km.state = XFRM_STATE_DEAD;
385 xfrm_state_put(x);
386 error_no_put:
387 *errp = err;
388 return NULL;
389 }
390
391 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
392 struct nlattr **attrs)
393 {
394 struct xfrm_usersa_info *p = nlmsg_data(nlh);
395 struct xfrm_state *x;
396 int err;
397 struct km_event c;
398 uid_t loginuid = NETLINK_CB(skb).loginuid;
399 u32 sessionid = NETLINK_CB(skb).sessionid;
400 u32 sid = NETLINK_CB(skb).sid;
401
402 err = verify_newsa_info(p, attrs);
403 if (err)
404 return err;
405
406 x = xfrm_state_construct(p, attrs, &err);
407 if (!x)
408 return err;
409
410 xfrm_state_hold(x);
411 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
412 err = xfrm_state_add(x);
413 else
414 err = xfrm_state_update(x);
415
416 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
417
418 if (err < 0) {
419 x->km.state = XFRM_STATE_DEAD;
420 __xfrm_state_put(x);
421 goto out;
422 }
423
424 c.seq = nlh->nlmsg_seq;
425 c.pid = nlh->nlmsg_pid;
426 c.event = nlh->nlmsg_type;
427
428 km_state_notify(x, &c);
429 out:
430 xfrm_state_put(x);
431 return err;
432 }
433
434 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
435 struct nlattr **attrs,
436 int *errp)
437 {
438 struct xfrm_state *x = NULL;
439 int err;
440
441 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
442 err = -ESRCH;
443 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
444 } else {
445 xfrm_address_t *saddr = NULL;
446
447 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
448 if (!saddr) {
449 err = -EINVAL;
450 goto out;
451 }
452
453 err = -ESRCH;
454 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
455 p->family);
456 }
457
458 out:
459 if (!x && errp)
460 *errp = err;
461 return x;
462 }
463
464 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
465 struct nlattr **attrs)
466 {
467 struct xfrm_state *x;
468 int err = -ESRCH;
469 struct km_event c;
470 struct xfrm_usersa_id *p = nlmsg_data(nlh);
471 uid_t loginuid = NETLINK_CB(skb).loginuid;
472 u32 sessionid = NETLINK_CB(skb).sessionid;
473 u32 sid = NETLINK_CB(skb).sid;
474
475 x = xfrm_user_state_lookup(p, attrs, &err);
476 if (x == NULL)
477 return err;
478
479 if ((err = security_xfrm_state_delete(x)) != 0)
480 goto out;
481
482 if (xfrm_state_kern(x)) {
483 err = -EPERM;
484 goto out;
485 }
486
487 err = xfrm_state_delete(x);
488
489 if (err < 0)
490 goto out;
491
492 c.seq = nlh->nlmsg_seq;
493 c.pid = nlh->nlmsg_pid;
494 c.event = nlh->nlmsg_type;
495 km_state_notify(x, &c);
496
497 out:
498 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
499 xfrm_state_put(x);
500 return err;
501 }
502
503 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
504 {
505 memcpy(&p->id, &x->id, sizeof(p->id));
506 memcpy(&p->sel, &x->sel, sizeof(p->sel));
507 memcpy(&p->lft, &x->lft, sizeof(p->lft));
508 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
509 memcpy(&p->stats, &x->stats, sizeof(p->stats));
510 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
511 p->mode = x->props.mode;
512 p->replay_window = x->props.replay_window;
513 p->reqid = x->props.reqid;
514 p->family = x->props.family;
515 p->flags = x->props.flags;
516 p->seq = x->km.seq;
517 }
518
519 struct xfrm_dump_info {
520 struct sk_buff *in_skb;
521 struct sk_buff *out_skb;
522 u32 nlmsg_seq;
523 u16 nlmsg_flags;
524 };
525
526 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
527 {
528 struct xfrm_user_sec_ctx *uctx;
529 struct nlattr *attr;
530 int ctx_size = sizeof(*uctx) + s->ctx_len;
531
532 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
533 if (attr == NULL)
534 return -EMSGSIZE;
535
536 uctx = nla_data(attr);
537 uctx->exttype = XFRMA_SEC_CTX;
538 uctx->len = ctx_size;
539 uctx->ctx_doi = s->ctx_doi;
540 uctx->ctx_alg = s->ctx_alg;
541 uctx->ctx_len = s->ctx_len;
542 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
543
544 return 0;
545 }
546
547 /* Don't change this without updating xfrm_sa_len! */
548 static int copy_to_user_state_extra(struct xfrm_state *x,
549 struct xfrm_usersa_info *p,
550 struct sk_buff *skb)
551 {
552 copy_to_user_state(x, p);
553
554 if (x->coaddr)
555 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
556
557 if (x->lastused)
558 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
559
560 if (x->aead)
561 NLA_PUT(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
562 if (x->aalg)
563 NLA_PUT(skb, XFRMA_ALG_AUTH, xfrm_alg_len(x->aalg), x->aalg);
564 if (x->ealg)
565 NLA_PUT(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
566 if (x->calg)
567 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
568
569 if (x->encap)
570 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
571
572 if (x->security && copy_sec_ctx(x->security, skb) < 0)
573 goto nla_put_failure;
574
575 return 0;
576
577 nla_put_failure:
578 return -EMSGSIZE;
579 }
580
581 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
582 {
583 struct xfrm_dump_info *sp = ptr;
584 struct sk_buff *in_skb = sp->in_skb;
585 struct sk_buff *skb = sp->out_skb;
586 struct xfrm_usersa_info *p;
587 struct nlmsghdr *nlh;
588 int err;
589
590 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
591 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
592 if (nlh == NULL)
593 return -EMSGSIZE;
594
595 p = nlmsg_data(nlh);
596
597 err = copy_to_user_state_extra(x, p, skb);
598 if (err)
599 goto nla_put_failure;
600
601 nlmsg_end(skb, nlh);
602 return 0;
603
604 nla_put_failure:
605 nlmsg_cancel(skb, nlh);
606 return err;
607 }
608
609 static int xfrm_dump_sa_done(struct netlink_callback *cb)
610 {
611 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
612 xfrm_state_walk_done(walk);
613 return 0;
614 }
615
616 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
617 {
618 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
619 struct xfrm_dump_info info;
620
621 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
622 sizeof(cb->args) - sizeof(cb->args[0]));
623
624 info.in_skb = cb->skb;
625 info.out_skb = skb;
626 info.nlmsg_seq = cb->nlh->nlmsg_seq;
627 info.nlmsg_flags = NLM_F_MULTI;
628
629 if (!cb->args[0]) {
630 cb->args[0] = 1;
631 xfrm_state_walk_init(walk, 0);
632 }
633
634 (void) xfrm_state_walk(walk, dump_one_state, &info);
635
636 return skb->len;
637 }
638
639 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
640 struct xfrm_state *x, u32 seq)
641 {
642 struct xfrm_dump_info info;
643 struct sk_buff *skb;
644
645 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
646 if (!skb)
647 return ERR_PTR(-ENOMEM);
648
649 info.in_skb = in_skb;
650 info.out_skb = skb;
651 info.nlmsg_seq = seq;
652 info.nlmsg_flags = 0;
653
654 if (dump_one_state(x, 0, &info)) {
655 kfree_skb(skb);
656 return NULL;
657 }
658
659 return skb;
660 }
661
662 static inline size_t xfrm_spdinfo_msgsize(void)
663 {
664 return NLMSG_ALIGN(4)
665 + nla_total_size(sizeof(struct xfrmu_spdinfo))
666 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
667 }
668
669 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
670 {
671 struct xfrmk_spdinfo si;
672 struct xfrmu_spdinfo spc;
673 struct xfrmu_spdhinfo sph;
674 struct nlmsghdr *nlh;
675 u32 *f;
676
677 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
678 if (nlh == NULL) /* shouldnt really happen ... */
679 return -EMSGSIZE;
680
681 f = nlmsg_data(nlh);
682 *f = flags;
683 xfrm_spd_getinfo(&si);
684 spc.incnt = si.incnt;
685 spc.outcnt = si.outcnt;
686 spc.fwdcnt = si.fwdcnt;
687 spc.inscnt = si.inscnt;
688 spc.outscnt = si.outscnt;
689 spc.fwdscnt = si.fwdscnt;
690 sph.spdhcnt = si.spdhcnt;
691 sph.spdhmcnt = si.spdhmcnt;
692
693 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
694 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
695
696 return nlmsg_end(skb, nlh);
697
698 nla_put_failure:
699 nlmsg_cancel(skb, nlh);
700 return -EMSGSIZE;
701 }
702
703 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
704 struct nlattr **attrs)
705 {
706 struct sk_buff *r_skb;
707 u32 *flags = nlmsg_data(nlh);
708 u32 spid = NETLINK_CB(skb).pid;
709 u32 seq = nlh->nlmsg_seq;
710
711 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
712 if (r_skb == NULL)
713 return -ENOMEM;
714
715 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
716 BUG();
717
718 return nlmsg_unicast(xfrm_nl, r_skb, spid);
719 }
720
721 static inline size_t xfrm_sadinfo_msgsize(void)
722 {
723 return NLMSG_ALIGN(4)
724 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
725 + nla_total_size(4); /* XFRMA_SAD_CNT */
726 }
727
728 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
729 {
730 struct xfrmk_sadinfo si;
731 struct xfrmu_sadhinfo sh;
732 struct nlmsghdr *nlh;
733 u32 *f;
734
735 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
736 if (nlh == NULL) /* shouldnt really happen ... */
737 return -EMSGSIZE;
738
739 f = nlmsg_data(nlh);
740 *f = flags;
741 xfrm_sad_getinfo(&si);
742
743 sh.sadhmcnt = si.sadhmcnt;
744 sh.sadhcnt = si.sadhcnt;
745
746 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
747 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
748
749 return nlmsg_end(skb, nlh);
750
751 nla_put_failure:
752 nlmsg_cancel(skb, nlh);
753 return -EMSGSIZE;
754 }
755
756 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
757 struct nlattr **attrs)
758 {
759 struct sk_buff *r_skb;
760 u32 *flags = nlmsg_data(nlh);
761 u32 spid = NETLINK_CB(skb).pid;
762 u32 seq = nlh->nlmsg_seq;
763
764 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
765 if (r_skb == NULL)
766 return -ENOMEM;
767
768 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
769 BUG();
770
771 return nlmsg_unicast(xfrm_nl, r_skb, spid);
772 }
773
774 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
775 struct nlattr **attrs)
776 {
777 struct xfrm_usersa_id *p = nlmsg_data(nlh);
778 struct xfrm_state *x;
779 struct sk_buff *resp_skb;
780 int err = -ESRCH;
781
782 x = xfrm_user_state_lookup(p, attrs, &err);
783 if (x == NULL)
784 goto out_noput;
785
786 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
787 if (IS_ERR(resp_skb)) {
788 err = PTR_ERR(resp_skb);
789 } else {
790 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
791 }
792 xfrm_state_put(x);
793 out_noput:
794 return err;
795 }
796
797 static int verify_userspi_info(struct xfrm_userspi_info *p)
798 {
799 switch (p->info.id.proto) {
800 case IPPROTO_AH:
801 case IPPROTO_ESP:
802 break;
803
804 case IPPROTO_COMP:
805 /* IPCOMP spi is 16-bits. */
806 if (p->max >= 0x10000)
807 return -EINVAL;
808 break;
809
810 default:
811 return -EINVAL;
812 }
813
814 if (p->min > p->max)
815 return -EINVAL;
816
817 return 0;
818 }
819
820 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
821 struct nlattr **attrs)
822 {
823 struct xfrm_state *x;
824 struct xfrm_userspi_info *p;
825 struct sk_buff *resp_skb;
826 xfrm_address_t *daddr;
827 int family;
828 int err;
829
830 p = nlmsg_data(nlh);
831 err = verify_userspi_info(p);
832 if (err)
833 goto out_noput;
834
835 family = p->info.family;
836 daddr = &p->info.id.daddr;
837
838 x = NULL;
839 if (p->info.seq) {
840 x = xfrm_find_acq_byseq(p->info.seq);
841 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
842 xfrm_state_put(x);
843 x = NULL;
844 }
845 }
846
847 if (!x)
848 x = xfrm_find_acq(p->info.mode, p->info.reqid,
849 p->info.id.proto, daddr,
850 &p->info.saddr, 1,
851 family);
852 err = -ENOENT;
853 if (x == NULL)
854 goto out_noput;
855
856 err = xfrm_alloc_spi(x, p->min, p->max);
857 if (err)
858 goto out;
859
860 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
861 if (IS_ERR(resp_skb)) {
862 err = PTR_ERR(resp_skb);
863 goto out;
864 }
865
866 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
867
868 out:
869 xfrm_state_put(x);
870 out_noput:
871 return err;
872 }
873
874 static int verify_policy_dir(u8 dir)
875 {
876 switch (dir) {
877 case XFRM_POLICY_IN:
878 case XFRM_POLICY_OUT:
879 case XFRM_POLICY_FWD:
880 break;
881
882 default:
883 return -EINVAL;
884 }
885
886 return 0;
887 }
888
889 static int verify_policy_type(u8 type)
890 {
891 switch (type) {
892 case XFRM_POLICY_TYPE_MAIN:
893 #ifdef CONFIG_XFRM_SUB_POLICY
894 case XFRM_POLICY_TYPE_SUB:
895 #endif
896 break;
897
898 default:
899 return -EINVAL;
900 }
901
902 return 0;
903 }
904
905 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
906 {
907 switch (p->share) {
908 case XFRM_SHARE_ANY:
909 case XFRM_SHARE_SESSION:
910 case XFRM_SHARE_USER:
911 case XFRM_SHARE_UNIQUE:
912 break;
913
914 default:
915 return -EINVAL;
916 }
917
918 switch (p->action) {
919 case XFRM_POLICY_ALLOW:
920 case XFRM_POLICY_BLOCK:
921 break;
922
923 default:
924 return -EINVAL;
925 }
926
927 switch (p->sel.family) {
928 case AF_INET:
929 break;
930
931 case AF_INET6:
932 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
933 break;
934 #else
935 return -EAFNOSUPPORT;
936 #endif
937
938 default:
939 return -EINVAL;
940 }
941
942 return verify_policy_dir(p->dir);
943 }
944
945 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
946 {
947 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
948 struct xfrm_user_sec_ctx *uctx;
949
950 if (!rt)
951 return 0;
952
953 uctx = nla_data(rt);
954 return security_xfrm_policy_alloc(&pol->security, uctx);
955 }
956
957 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
958 int nr)
959 {
960 int i;
961
962 xp->xfrm_nr = nr;
963 for (i = 0; i < nr; i++, ut++) {
964 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
965
966 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
967 memcpy(&t->saddr, &ut->saddr,
968 sizeof(xfrm_address_t));
969 t->reqid = ut->reqid;
970 t->mode = ut->mode;
971 t->share = ut->share;
972 t->optional = ut->optional;
973 t->aalgos = ut->aalgos;
974 t->ealgos = ut->ealgos;
975 t->calgos = ut->calgos;
976 /* If all masks are ~0, then we allow all algorithms. */
977 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
978 t->encap_family = ut->family;
979 }
980 }
981
982 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
983 {
984 int i;
985
986 if (nr > XFRM_MAX_DEPTH)
987 return -EINVAL;
988
989 for (i = 0; i < nr; i++) {
990 /* We never validated the ut->family value, so many
991 * applications simply leave it at zero. The check was
992 * never made and ut->family was ignored because all
993 * templates could be assumed to have the same family as
994 * the policy itself. Now that we will have ipv4-in-ipv6
995 * and ipv6-in-ipv4 tunnels, this is no longer true.
996 */
997 if (!ut[i].family)
998 ut[i].family = family;
999
1000 switch (ut[i].family) {
1001 case AF_INET:
1002 break;
1003 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1004 case AF_INET6:
1005 break;
1006 #endif
1007 default:
1008 return -EINVAL;
1009 }
1010 }
1011
1012 return 0;
1013 }
1014
1015 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1016 {
1017 struct nlattr *rt = attrs[XFRMA_TMPL];
1018
1019 if (!rt) {
1020 pol->xfrm_nr = 0;
1021 } else {
1022 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1023 int nr = nla_len(rt) / sizeof(*utmpl);
1024 int err;
1025
1026 err = validate_tmpl(nr, utmpl, pol->family);
1027 if (err)
1028 return err;
1029
1030 copy_templates(pol, utmpl, nr);
1031 }
1032 return 0;
1033 }
1034
1035 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1036 {
1037 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1038 struct xfrm_userpolicy_type *upt;
1039 u8 type = XFRM_POLICY_TYPE_MAIN;
1040 int err;
1041
1042 if (rt) {
1043 upt = nla_data(rt);
1044 type = upt->type;
1045 }
1046
1047 err = verify_policy_type(type);
1048 if (err)
1049 return err;
1050
1051 *tp = type;
1052 return 0;
1053 }
1054
1055 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1056 {
1057 xp->priority = p->priority;
1058 xp->index = p->index;
1059 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1060 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1061 xp->action = p->action;
1062 xp->flags = p->flags;
1063 xp->family = p->sel.family;
1064 /* XXX xp->share = p->share; */
1065 }
1066
1067 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1068 {
1069 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1070 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1071 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1072 p->priority = xp->priority;
1073 p->index = xp->index;
1074 p->sel.family = xp->family;
1075 p->dir = dir;
1076 p->action = xp->action;
1077 p->flags = xp->flags;
1078 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1079 }
1080
1081 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1082 {
1083 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1084 int err;
1085
1086 if (!xp) {
1087 *errp = -ENOMEM;
1088 return NULL;
1089 }
1090
1091 copy_from_user_policy(xp, p);
1092
1093 err = copy_from_user_policy_type(&xp->type, attrs);
1094 if (err)
1095 goto error;
1096
1097 if (!(err = copy_from_user_tmpl(xp, attrs)))
1098 err = copy_from_user_sec_ctx(xp, attrs);
1099 if (err)
1100 goto error;
1101
1102 return xp;
1103 error:
1104 *errp = err;
1105 xp->walk.dead = 1;
1106 xfrm_policy_destroy(xp);
1107 return NULL;
1108 }
1109
1110 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1111 struct nlattr **attrs)
1112 {
1113 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1114 struct xfrm_policy *xp;
1115 struct km_event c;
1116 int err;
1117 int excl;
1118 uid_t loginuid = NETLINK_CB(skb).loginuid;
1119 u32 sessionid = NETLINK_CB(skb).sessionid;
1120 u32 sid = NETLINK_CB(skb).sid;
1121
1122 err = verify_newpolicy_info(p);
1123 if (err)
1124 return err;
1125 err = verify_sec_ctx_len(attrs);
1126 if (err)
1127 return err;
1128
1129 xp = xfrm_policy_construct(p, attrs, &err);
1130 if (!xp)
1131 return err;
1132
1133 /* shouldnt excl be based on nlh flags??
1134 * Aha! this is anti-netlink really i.e more pfkey derived
1135 * in netlink excl is a flag and you wouldnt need
1136 * a type XFRM_MSG_UPDPOLICY - JHS */
1137 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1138 err = xfrm_policy_insert(p->dir, xp, excl);
1139 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1140
1141 if (err) {
1142 security_xfrm_policy_free(xp->security);
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 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1235 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1236 if (nlh == NULL)
1237 return -EMSGSIZE;
1238
1239 p = nlmsg_data(nlh);
1240 copy_to_user_policy(xp, p, dir);
1241 if (copy_to_user_tmpl(xp, skb) < 0)
1242 goto nlmsg_failure;
1243 if (copy_to_user_sec_ctx(xp, skb))
1244 goto nlmsg_failure;
1245 if (copy_to_user_policy_type(xp->type, skb) < 0)
1246 goto nlmsg_failure;
1247
1248 nlmsg_end(skb, nlh);
1249 return 0;
1250
1251 nlmsg_failure:
1252 nlmsg_cancel(skb, nlh);
1253 return -EMSGSIZE;
1254 }
1255
1256 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1257 {
1258 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1259
1260 xfrm_policy_walk_done(walk);
1261 return 0;
1262 }
1263
1264 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1265 {
1266 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1267 struct xfrm_dump_info info;
1268
1269 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1270 sizeof(cb->args) - sizeof(cb->args[0]));
1271
1272 info.in_skb = cb->skb;
1273 info.out_skb = skb;
1274 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1275 info.nlmsg_flags = NLM_F_MULTI;
1276
1277 if (!cb->args[0]) {
1278 cb->args[0] = 1;
1279 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1280 }
1281
1282 (void) xfrm_policy_walk(walk, dump_one_policy, &info);
1283
1284 return skb->len;
1285 }
1286
1287 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1288 struct xfrm_policy *xp,
1289 int dir, u32 seq)
1290 {
1291 struct xfrm_dump_info info;
1292 struct sk_buff *skb;
1293
1294 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1295 if (!skb)
1296 return ERR_PTR(-ENOMEM);
1297
1298 info.in_skb = in_skb;
1299 info.out_skb = skb;
1300 info.nlmsg_seq = seq;
1301 info.nlmsg_flags = 0;
1302
1303 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1304 kfree_skb(skb);
1305 return NULL;
1306 }
1307
1308 return skb;
1309 }
1310
1311 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1312 struct nlattr **attrs)
1313 {
1314 struct xfrm_policy *xp;
1315 struct xfrm_userpolicy_id *p;
1316 u8 type = XFRM_POLICY_TYPE_MAIN;
1317 int err;
1318 struct km_event c;
1319 int delete;
1320
1321 p = nlmsg_data(nlh);
1322 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1323
1324 err = copy_from_user_policy_type(&type, attrs);
1325 if (err)
1326 return err;
1327
1328 err = verify_policy_dir(p->dir);
1329 if (err)
1330 return err;
1331
1332 if (p->index)
1333 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1334 else {
1335 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1336 struct xfrm_sec_ctx *ctx;
1337
1338 err = verify_sec_ctx_len(attrs);
1339 if (err)
1340 return err;
1341
1342 ctx = NULL;
1343 if (rt) {
1344 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1345
1346 err = security_xfrm_policy_alloc(&ctx, uctx);
1347 if (err)
1348 return err;
1349 }
1350 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx,
1351 delete, &err);
1352 security_xfrm_policy_free(ctx);
1353 }
1354 if (xp == NULL)
1355 return -ENOENT;
1356
1357 if (!delete) {
1358 struct sk_buff *resp_skb;
1359
1360 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1361 if (IS_ERR(resp_skb)) {
1362 err = PTR_ERR(resp_skb);
1363 } else {
1364 err = nlmsg_unicast(xfrm_nl, resp_skb,
1365 NETLINK_CB(skb).pid);
1366 }
1367 } else {
1368 uid_t loginuid = NETLINK_CB(skb).loginuid;
1369 u32 sessionid = NETLINK_CB(skb).sessionid;
1370 u32 sid = NETLINK_CB(skb).sid;
1371
1372 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1373 sid);
1374
1375 if (err != 0)
1376 goto out;
1377
1378 c.data.byid = p->index;
1379 c.event = nlh->nlmsg_type;
1380 c.seq = nlh->nlmsg_seq;
1381 c.pid = nlh->nlmsg_pid;
1382 km_policy_notify(xp, p->dir, &c);
1383 }
1384
1385 out:
1386 xfrm_pol_put(xp);
1387 return err;
1388 }
1389
1390 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1391 struct nlattr **attrs)
1392 {
1393 struct km_event c;
1394 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1395 struct xfrm_audit audit_info;
1396 int err;
1397
1398 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1399 audit_info.sessionid = NETLINK_CB(skb).sessionid;
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.sessionid = NETLINK_CB(skb).sessionid;
1548 audit_info.secid = NETLINK_CB(skb).sid;
1549 err = xfrm_policy_flush(type, &audit_info);
1550 if (err)
1551 return err;
1552 c.data.type = type;
1553 c.event = nlh->nlmsg_type;
1554 c.seq = nlh->nlmsg_seq;
1555 c.pid = nlh->nlmsg_pid;
1556 km_policy_notify(NULL, 0, &c);
1557 return 0;
1558 }
1559
1560 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1561 struct nlattr **attrs)
1562 {
1563 struct xfrm_policy *xp;
1564 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1565 struct xfrm_userpolicy_info *p = &up->pol;
1566 u8 type = XFRM_POLICY_TYPE_MAIN;
1567 int err = -ENOENT;
1568
1569 err = copy_from_user_policy_type(&type, attrs);
1570 if (err)
1571 return err;
1572
1573 if (p->index)
1574 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1575 else {
1576 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1577 struct xfrm_sec_ctx *ctx;
1578
1579 err = verify_sec_ctx_len(attrs);
1580 if (err)
1581 return err;
1582
1583 ctx = NULL;
1584 if (rt) {
1585 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1586
1587 err = security_xfrm_policy_alloc(&ctx, uctx);
1588 if (err)
1589 return err;
1590 }
1591 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, ctx, 0, &err);
1592 security_xfrm_policy_free(ctx);
1593 }
1594 if (xp == NULL)
1595 return -ENOENT;
1596
1597 read_lock(&xp->lock);
1598 if (xp->walk.dead) {
1599 read_unlock(&xp->lock);
1600 goto out;
1601 }
1602
1603 read_unlock(&xp->lock);
1604 err = 0;
1605 if (up->hard) {
1606 uid_t loginuid = NETLINK_CB(skb).loginuid;
1607 uid_t sessionid = NETLINK_CB(skb).sessionid;
1608 u32 sid = NETLINK_CB(skb).sid;
1609 xfrm_policy_delete(xp, p->dir);
1610 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1611
1612 } else {
1613 // reset the timers here?
1614 printk("Dont know what to do with soft policy expire\n");
1615 }
1616 km_policy_expired(xp, p->dir, up->hard, current->pid);
1617
1618 out:
1619 xfrm_pol_put(xp);
1620 return err;
1621 }
1622
1623 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1624 struct nlattr **attrs)
1625 {
1626 struct xfrm_state *x;
1627 int err;
1628 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1629 struct xfrm_usersa_info *p = &ue->state;
1630
1631 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1632
1633 err = -ENOENT;
1634 if (x == NULL)
1635 return err;
1636
1637 spin_lock_bh(&x->lock);
1638 err = -EINVAL;
1639 if (x->km.state != XFRM_STATE_VALID)
1640 goto out;
1641 km_state_expired(x, ue->hard, current->pid);
1642
1643 if (ue->hard) {
1644 uid_t loginuid = NETLINK_CB(skb).loginuid;
1645 uid_t sessionid = NETLINK_CB(skb).sessionid;
1646 u32 sid = NETLINK_CB(skb).sid;
1647 __xfrm_state_delete(x);
1648 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1649 }
1650 err = 0;
1651 out:
1652 spin_unlock_bh(&x->lock);
1653 xfrm_state_put(x);
1654 return err;
1655 }
1656
1657 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1658 struct nlattr **attrs)
1659 {
1660 struct xfrm_policy *xp;
1661 struct xfrm_user_tmpl *ut;
1662 int i;
1663 struct nlattr *rt = attrs[XFRMA_TMPL];
1664
1665 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1666 struct xfrm_state *x = xfrm_state_alloc();
1667 int err = -ENOMEM;
1668
1669 if (!x)
1670 return err;
1671
1672 err = verify_newpolicy_info(&ua->policy);
1673 if (err) {
1674 printk("BAD policy passed\n");
1675 kfree(x);
1676 return err;
1677 }
1678
1679 /* build an XP */
1680 xp = xfrm_policy_construct(&ua->policy, attrs, &err);
1681 if (!xp) {
1682 kfree(x);
1683 return err;
1684 }
1685
1686 memcpy(&x->id, &ua->id, sizeof(ua->id));
1687 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1688 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1689
1690 ut = nla_data(rt);
1691 /* extract the templates and for each call km_key */
1692 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1693 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1694 memcpy(&x->id, &t->id, sizeof(x->id));
1695 x->props.mode = t->mode;
1696 x->props.reqid = t->reqid;
1697 x->props.family = ut->family;
1698 t->aalgos = ua->aalgos;
1699 t->ealgos = ua->ealgos;
1700 t->calgos = ua->calgos;
1701 err = km_query(x, t, xp);
1702
1703 }
1704
1705 kfree(x);
1706 kfree(xp);
1707
1708 return 0;
1709 }
1710
1711 #ifdef CONFIG_XFRM_MIGRATE
1712 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1713 struct xfrm_kmaddress *k,
1714 struct nlattr **attrs, int *num)
1715 {
1716 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1717 struct xfrm_user_migrate *um;
1718 int i, num_migrate;
1719
1720 if (k != NULL) {
1721 struct xfrm_user_kmaddress *uk;
1722
1723 uk = nla_data(attrs[XFRMA_KMADDRESS]);
1724 memcpy(&k->local, &uk->local, sizeof(k->local));
1725 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
1726 k->family = uk->family;
1727 k->reserved = uk->reserved;
1728 }
1729
1730 um = nla_data(rt);
1731 num_migrate = nla_len(rt) / sizeof(*um);
1732
1733 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1734 return -EINVAL;
1735
1736 for (i = 0; i < num_migrate; i++, um++, ma++) {
1737 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1738 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1739 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1740 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1741
1742 ma->proto = um->proto;
1743 ma->mode = um->mode;
1744 ma->reqid = um->reqid;
1745
1746 ma->old_family = um->old_family;
1747 ma->new_family = um->new_family;
1748 }
1749
1750 *num = i;
1751 return 0;
1752 }
1753
1754 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1755 struct nlattr **attrs)
1756 {
1757 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1758 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1759 struct xfrm_kmaddress km, *kmp;
1760 u8 type;
1761 int err;
1762 int n = 0;
1763
1764 if (attrs[XFRMA_MIGRATE] == NULL)
1765 return -EINVAL;
1766
1767 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
1768
1769 err = copy_from_user_policy_type(&type, attrs);
1770 if (err)
1771 return err;
1772
1773 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
1774 if (err)
1775 return err;
1776
1777 if (!n)
1778 return 0;
1779
1780 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
1781
1782 return 0;
1783 }
1784 #else
1785 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1786 struct nlattr **attrs)
1787 {
1788 return -ENOPROTOOPT;
1789 }
1790 #endif
1791
1792 #ifdef CONFIG_XFRM_MIGRATE
1793 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1794 {
1795 struct xfrm_user_migrate um;
1796
1797 memset(&um, 0, sizeof(um));
1798 um.proto = m->proto;
1799 um.mode = m->mode;
1800 um.reqid = m->reqid;
1801 um.old_family = m->old_family;
1802 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1803 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1804 um.new_family = m->new_family;
1805 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1806 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1807
1808 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1809 }
1810
1811 static int copy_to_user_kmaddress(struct xfrm_kmaddress *k, struct sk_buff *skb)
1812 {
1813 struct xfrm_user_kmaddress uk;
1814
1815 memset(&uk, 0, sizeof(uk));
1816 uk.family = k->family;
1817 uk.reserved = k->reserved;
1818 memcpy(&uk.local, &k->local, sizeof(uk.local));
1819 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
1820
1821 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
1822 }
1823
1824 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
1825 {
1826 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1827 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
1828 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1829 + userpolicy_type_attrsize();
1830 }
1831
1832 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1833 int num_migrate, struct xfrm_kmaddress *k,
1834 struct xfrm_selector *sel, u8 dir, u8 type)
1835 {
1836 struct xfrm_migrate *mp;
1837 struct xfrm_userpolicy_id *pol_id;
1838 struct nlmsghdr *nlh;
1839 int i;
1840
1841 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1842 if (nlh == NULL)
1843 return -EMSGSIZE;
1844
1845 pol_id = nlmsg_data(nlh);
1846 /* copy data from selector, dir, and type to the pol_id */
1847 memset(pol_id, 0, sizeof(*pol_id));
1848 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1849 pol_id->dir = dir;
1850
1851 if (k != NULL && (copy_to_user_kmaddress(k, skb) < 0))
1852 goto nlmsg_failure;
1853
1854 if (copy_to_user_policy_type(type, skb) < 0)
1855 goto nlmsg_failure;
1856
1857 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1858 if (copy_to_user_migrate(mp, skb) < 0)
1859 goto nlmsg_failure;
1860 }
1861
1862 return nlmsg_end(skb, nlh);
1863 nlmsg_failure:
1864 nlmsg_cancel(skb, nlh);
1865 return -EMSGSIZE;
1866 }
1867
1868 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1869 struct xfrm_migrate *m, int num_migrate,
1870 struct xfrm_kmaddress *k)
1871 {
1872 struct sk_buff *skb;
1873
1874 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
1875 if (skb == NULL)
1876 return -ENOMEM;
1877
1878 /* build migrate */
1879 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
1880 BUG();
1881
1882 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
1883 }
1884 #else
1885 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1886 struct xfrm_migrate *m, int num_migrate,
1887 struct xfrm_kmaddress *k)
1888 {
1889 return -ENOPROTOOPT;
1890 }
1891 #endif
1892
1893 #define XMSGSIZE(type) sizeof(struct type)
1894
1895 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1896 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1897 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1898 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1899 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1900 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1901 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1902 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1903 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1904 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1905 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1906 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1907 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1908 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1909 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
1910 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1911 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1912 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1913 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1914 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
1915 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1916 };
1917
1918 #undef XMSGSIZE
1919
1920 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1921 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
1922 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
1923 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
1924 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
1925 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
1926 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
1927 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
1928 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
1929 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
1930 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
1931 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
1932 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
1933 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
1934 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
1935 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
1936 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
1937 };
1938
1939 static struct xfrm_link {
1940 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1941 int (*dump)(struct sk_buff *, struct netlink_callback *);
1942 int (*done)(struct netlink_callback *);
1943 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1944 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1945 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1946 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1947 .dump = xfrm_dump_sa,
1948 .done = xfrm_dump_sa_done },
1949 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1950 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1951 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1952 .dump = xfrm_dump_policy,
1953 .done = xfrm_dump_policy_done },
1954 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1955 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1956 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1957 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1958 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1959 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1960 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1961 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1962 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1963 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1964 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1965 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1966 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1967 };
1968
1969 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1970 {
1971 struct nlattr *attrs[XFRMA_MAX+1];
1972 struct xfrm_link *link;
1973 int type, err;
1974
1975 type = nlh->nlmsg_type;
1976 if (type > XFRM_MSG_MAX)
1977 return -EINVAL;
1978
1979 type -= XFRM_MSG_BASE;
1980 link = &xfrm_dispatch[type];
1981
1982 /* All operations require privileges, even GET */
1983 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1984 return -EPERM;
1985
1986 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1987 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1988 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1989 if (link->dump == NULL)
1990 return -EINVAL;
1991
1992 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, link->done);
1993 }
1994
1995 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
1996 xfrma_policy);
1997 if (err < 0)
1998 return err;
1999
2000 if (link->doit == NULL)
2001 return -EINVAL;
2002
2003 return link->doit(skb, nlh, attrs);
2004 }
2005
2006 static void xfrm_netlink_rcv(struct sk_buff *skb)
2007 {
2008 mutex_lock(&xfrm_cfg_mutex);
2009 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2010 mutex_unlock(&xfrm_cfg_mutex);
2011 }
2012
2013 static inline size_t xfrm_expire_msgsize(void)
2014 {
2015 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
2016 }
2017
2018 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
2019 {
2020 struct xfrm_user_expire *ue;
2021 struct nlmsghdr *nlh;
2022
2023 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2024 if (nlh == NULL)
2025 return -EMSGSIZE;
2026
2027 ue = nlmsg_data(nlh);
2028 copy_to_user_state(x, &ue->state);
2029 ue->hard = (c->data.hard != 0) ? 1 : 0;
2030
2031 return nlmsg_end(skb, nlh);
2032 }
2033
2034 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
2035 {
2036 struct sk_buff *skb;
2037
2038 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2039 if (skb == NULL)
2040 return -ENOMEM;
2041
2042 if (build_expire(skb, x, c) < 0)
2043 BUG();
2044
2045 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2046 }
2047
2048 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2049 {
2050 struct sk_buff *skb;
2051
2052 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
2053 if (skb == NULL)
2054 return -ENOMEM;
2055
2056 if (build_aevent(skb, x, c) < 0)
2057 BUG();
2058
2059 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2060 }
2061
2062 static int xfrm_notify_sa_flush(struct km_event *c)
2063 {
2064 struct xfrm_usersa_flush *p;
2065 struct nlmsghdr *nlh;
2066 struct sk_buff *skb;
2067 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2068
2069 skb = nlmsg_new(len, GFP_ATOMIC);
2070 if (skb == NULL)
2071 return -ENOMEM;
2072
2073 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2074 if (nlh == NULL) {
2075 kfree_skb(skb);
2076 return -EMSGSIZE;
2077 }
2078
2079 p = nlmsg_data(nlh);
2080 p->proto = c->data.proto;
2081
2082 nlmsg_end(skb, nlh);
2083
2084 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2085 }
2086
2087 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2088 {
2089 size_t l = 0;
2090 if (x->aead)
2091 l += nla_total_size(aead_len(x->aead));
2092 if (x->aalg)
2093 l += nla_total_size(xfrm_alg_len(x->aalg));
2094 if (x->ealg)
2095 l += nla_total_size(xfrm_alg_len(x->ealg));
2096 if (x->calg)
2097 l += nla_total_size(sizeof(*x->calg));
2098 if (x->encap)
2099 l += nla_total_size(sizeof(*x->encap));
2100 if (x->security)
2101 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2102 x->security->ctx_len);
2103 if (x->coaddr)
2104 l += nla_total_size(sizeof(*x->coaddr));
2105
2106 /* Must count x->lastused as it may become non-zero behind our back. */
2107 l += nla_total_size(sizeof(u64));
2108
2109 return l;
2110 }
2111
2112 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2113 {
2114 struct xfrm_usersa_info *p;
2115 struct xfrm_usersa_id *id;
2116 struct nlmsghdr *nlh;
2117 struct sk_buff *skb;
2118 int len = xfrm_sa_len(x);
2119 int headlen;
2120
2121 headlen = sizeof(*p);
2122 if (c->event == XFRM_MSG_DELSA) {
2123 len += nla_total_size(headlen);
2124 headlen = sizeof(*id);
2125 }
2126 len += NLMSG_ALIGN(headlen);
2127
2128 skb = nlmsg_new(len, GFP_ATOMIC);
2129 if (skb == NULL)
2130 return -ENOMEM;
2131
2132 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2133 if (nlh == NULL)
2134 goto nla_put_failure;
2135
2136 p = nlmsg_data(nlh);
2137 if (c->event == XFRM_MSG_DELSA) {
2138 struct nlattr *attr;
2139
2140 id = nlmsg_data(nlh);
2141 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2142 id->spi = x->id.spi;
2143 id->family = x->props.family;
2144 id->proto = x->id.proto;
2145
2146 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2147 if (attr == NULL)
2148 goto nla_put_failure;
2149
2150 p = nla_data(attr);
2151 }
2152
2153 if (copy_to_user_state_extra(x, p, skb))
2154 goto nla_put_failure;
2155
2156 nlmsg_end(skb, nlh);
2157
2158 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2159
2160 nla_put_failure:
2161 /* Somebody screwed up with xfrm_sa_len! */
2162 WARN_ON(1);
2163 kfree_skb(skb);
2164 return -1;
2165 }
2166
2167 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2168 {
2169
2170 switch (c->event) {
2171 case XFRM_MSG_EXPIRE:
2172 return xfrm_exp_state_notify(x, c);
2173 case XFRM_MSG_NEWAE:
2174 return xfrm_aevent_state_notify(x, c);
2175 case XFRM_MSG_DELSA:
2176 case XFRM_MSG_UPDSA:
2177 case XFRM_MSG_NEWSA:
2178 return xfrm_notify_sa(x, c);
2179 case XFRM_MSG_FLUSHSA:
2180 return xfrm_notify_sa_flush(c);
2181 default:
2182 printk("xfrm_user: Unknown SA event %d\n", c->event);
2183 break;
2184 }
2185
2186 return 0;
2187
2188 }
2189
2190 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2191 struct xfrm_policy *xp)
2192 {
2193 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2194 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2195 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2196 + userpolicy_type_attrsize();
2197 }
2198
2199 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2200 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2201 int dir)
2202 {
2203 struct xfrm_user_acquire *ua;
2204 struct nlmsghdr *nlh;
2205 __u32 seq = xfrm_get_acqseq();
2206
2207 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2208 if (nlh == NULL)
2209 return -EMSGSIZE;
2210
2211 ua = nlmsg_data(nlh);
2212 memcpy(&ua->id, &x->id, sizeof(ua->id));
2213 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2214 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2215 copy_to_user_policy(xp, &ua->policy, dir);
2216 ua->aalgos = xt->aalgos;
2217 ua->ealgos = xt->ealgos;
2218 ua->calgos = xt->calgos;
2219 ua->seq = x->km.seq = seq;
2220
2221 if (copy_to_user_tmpl(xp, skb) < 0)
2222 goto nlmsg_failure;
2223 if (copy_to_user_state_sec_ctx(x, skb))
2224 goto nlmsg_failure;
2225 if (copy_to_user_policy_type(xp->type, skb) < 0)
2226 goto nlmsg_failure;
2227
2228 return nlmsg_end(skb, nlh);
2229
2230 nlmsg_failure:
2231 nlmsg_cancel(skb, nlh);
2232 return -EMSGSIZE;
2233 }
2234
2235 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2236 struct xfrm_policy *xp, int dir)
2237 {
2238 struct sk_buff *skb;
2239
2240 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2241 if (skb == NULL)
2242 return -ENOMEM;
2243
2244 if (build_acquire(skb, x, xt, xp, dir) < 0)
2245 BUG();
2246
2247 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2248 }
2249
2250 /* User gives us xfrm_user_policy_info followed by an array of 0
2251 * or more templates.
2252 */
2253 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2254 u8 *data, int len, int *dir)
2255 {
2256 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2257 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2258 struct xfrm_policy *xp;
2259 int nr;
2260
2261 switch (sk->sk_family) {
2262 case AF_INET:
2263 if (opt != IP_XFRM_POLICY) {
2264 *dir = -EOPNOTSUPP;
2265 return NULL;
2266 }
2267 break;
2268 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2269 case AF_INET6:
2270 if (opt != IPV6_XFRM_POLICY) {
2271 *dir = -EOPNOTSUPP;
2272 return NULL;
2273 }
2274 break;
2275 #endif
2276 default:
2277 *dir = -EINVAL;
2278 return NULL;
2279 }
2280
2281 *dir = -EINVAL;
2282
2283 if (len < sizeof(*p) ||
2284 verify_newpolicy_info(p))
2285 return NULL;
2286
2287 nr = ((len - sizeof(*p)) / sizeof(*ut));
2288 if (validate_tmpl(nr, ut, p->sel.family))
2289 return NULL;
2290
2291 if (p->dir > XFRM_POLICY_OUT)
2292 return NULL;
2293
2294 xp = xfrm_policy_alloc(GFP_KERNEL);
2295 if (xp == NULL) {
2296 *dir = -ENOBUFS;
2297 return NULL;
2298 }
2299
2300 copy_from_user_policy(xp, p);
2301 xp->type = XFRM_POLICY_TYPE_MAIN;
2302 copy_templates(xp, ut, nr);
2303
2304 *dir = p->dir;
2305
2306 return xp;
2307 }
2308
2309 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2310 {
2311 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2312 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2313 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2314 + userpolicy_type_attrsize();
2315 }
2316
2317 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2318 int dir, struct km_event *c)
2319 {
2320 struct xfrm_user_polexpire *upe;
2321 struct nlmsghdr *nlh;
2322 int hard = c->data.hard;
2323
2324 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2325 if (nlh == NULL)
2326 return -EMSGSIZE;
2327
2328 upe = nlmsg_data(nlh);
2329 copy_to_user_policy(xp, &upe->pol, dir);
2330 if (copy_to_user_tmpl(xp, skb) < 0)
2331 goto nlmsg_failure;
2332 if (copy_to_user_sec_ctx(xp, skb))
2333 goto nlmsg_failure;
2334 if (copy_to_user_policy_type(xp->type, skb) < 0)
2335 goto nlmsg_failure;
2336 upe->hard = !!hard;
2337
2338 return nlmsg_end(skb, nlh);
2339
2340 nlmsg_failure:
2341 nlmsg_cancel(skb, nlh);
2342 return -EMSGSIZE;
2343 }
2344
2345 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2346 {
2347 struct sk_buff *skb;
2348
2349 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2350 if (skb == NULL)
2351 return -ENOMEM;
2352
2353 if (build_polexpire(skb, xp, dir, c) < 0)
2354 BUG();
2355
2356 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2357 }
2358
2359 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2360 {
2361 struct xfrm_userpolicy_info *p;
2362 struct xfrm_userpolicy_id *id;
2363 struct nlmsghdr *nlh;
2364 struct sk_buff *skb;
2365 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2366 int headlen;
2367
2368 headlen = sizeof(*p);
2369 if (c->event == XFRM_MSG_DELPOLICY) {
2370 len += nla_total_size(headlen);
2371 headlen = sizeof(*id);
2372 }
2373 len += userpolicy_type_attrsize();
2374 len += NLMSG_ALIGN(headlen);
2375
2376 skb = nlmsg_new(len, GFP_ATOMIC);
2377 if (skb == NULL)
2378 return -ENOMEM;
2379
2380 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2381 if (nlh == NULL)
2382 goto nlmsg_failure;
2383
2384 p = nlmsg_data(nlh);
2385 if (c->event == XFRM_MSG_DELPOLICY) {
2386 struct nlattr *attr;
2387
2388 id = nlmsg_data(nlh);
2389 memset(id, 0, sizeof(*id));
2390 id->dir = dir;
2391 if (c->data.byid)
2392 id->index = xp->index;
2393 else
2394 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2395
2396 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2397 if (attr == NULL)
2398 goto nlmsg_failure;
2399
2400 p = nla_data(attr);
2401 }
2402
2403 copy_to_user_policy(xp, p, dir);
2404 if (copy_to_user_tmpl(xp, skb) < 0)
2405 goto nlmsg_failure;
2406 if (copy_to_user_policy_type(xp->type, skb) < 0)
2407 goto nlmsg_failure;
2408
2409 nlmsg_end(skb, nlh);
2410
2411 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2412
2413 nlmsg_failure:
2414 kfree_skb(skb);
2415 return -1;
2416 }
2417
2418 static int xfrm_notify_policy_flush(struct km_event *c)
2419 {
2420 struct nlmsghdr *nlh;
2421 struct sk_buff *skb;
2422
2423 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2424 if (skb == NULL)
2425 return -ENOMEM;
2426
2427 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2428 if (nlh == NULL)
2429 goto nlmsg_failure;
2430 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2431 goto nlmsg_failure;
2432
2433 nlmsg_end(skb, nlh);
2434
2435 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2436
2437 nlmsg_failure:
2438 kfree_skb(skb);
2439 return -1;
2440 }
2441
2442 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2443 {
2444
2445 switch (c->event) {
2446 case XFRM_MSG_NEWPOLICY:
2447 case XFRM_MSG_UPDPOLICY:
2448 case XFRM_MSG_DELPOLICY:
2449 return xfrm_notify_policy(xp, dir, c);
2450 case XFRM_MSG_FLUSHPOLICY:
2451 return xfrm_notify_policy_flush(c);
2452 case XFRM_MSG_POLEXPIRE:
2453 return xfrm_exp_policy_notify(xp, dir, c);
2454 default:
2455 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2456 }
2457
2458 return 0;
2459
2460 }
2461
2462 static inline size_t xfrm_report_msgsize(void)
2463 {
2464 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2465 }
2466
2467 static int build_report(struct sk_buff *skb, u8 proto,
2468 struct xfrm_selector *sel, xfrm_address_t *addr)
2469 {
2470 struct xfrm_user_report *ur;
2471 struct nlmsghdr *nlh;
2472
2473 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2474 if (nlh == NULL)
2475 return -EMSGSIZE;
2476
2477 ur = nlmsg_data(nlh);
2478 ur->proto = proto;
2479 memcpy(&ur->sel, sel, sizeof(ur->sel));
2480
2481 if (addr)
2482 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2483
2484 return nlmsg_end(skb, nlh);
2485
2486 nla_put_failure:
2487 nlmsg_cancel(skb, nlh);
2488 return -EMSGSIZE;
2489 }
2490
2491 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2492 xfrm_address_t *addr)
2493 {
2494 struct sk_buff *skb;
2495
2496 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2497 if (skb == NULL)
2498 return -ENOMEM;
2499
2500 if (build_report(skb, proto, sel, addr) < 0)
2501 BUG();
2502
2503 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2504 }
2505
2506 static struct xfrm_mgr netlink_mgr = {
2507 .id = "netlink",
2508 .notify = xfrm_send_state_notify,
2509 .acquire = xfrm_send_acquire,
2510 .compile_policy = xfrm_compile_policy,
2511 .notify_policy = xfrm_send_policy_notify,
2512 .report = xfrm_send_report,
2513 .migrate = xfrm_send_migrate,
2514 };
2515
2516 static int __init xfrm_user_init(void)
2517 {
2518 struct sock *nlsk;
2519
2520 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2521
2522 nlsk = netlink_kernel_create(&init_net, NETLINK_XFRM, XFRMNLGRP_MAX,
2523 xfrm_netlink_rcv, NULL, THIS_MODULE);
2524 if (nlsk == NULL)
2525 return -ENOMEM;
2526 rcu_assign_pointer(xfrm_nl, nlsk);
2527
2528 xfrm_register_km(&netlink_mgr);
2529
2530 return 0;
2531 }
2532
2533 static void __exit xfrm_user_exit(void)
2534 {
2535 struct sock *nlsk = xfrm_nl;
2536
2537 xfrm_unregister_km(&netlink_mgr);
2538 rcu_assign_pointer(xfrm_nl, NULL);
2539 synchronize_rcu();
2540 netlink_kernel_release(nlsk);
2541 }
2542
2543 module_init(xfrm_user_init);
2544 module_exit(xfrm_user_exit);
2545 MODULE_LICENSE("GPL");
2546 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2547
Linux kernel - Deliverables
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