?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[NETFILTER]: ipt_TCPMSS: reformat
[hh.org.git] / net / xfrm / xfrm_user.c
blobc59a78d2923a5baf23061e8f693d3114b8120109
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/pfkeyv2.h>
24 #include <linux/ipsec.h>
25 #include <linux/init.h>
26 #include <linux/security.h>
27 #include <net/sock.h>
28 #include <net/xfrm.h>
29 #include <net/netlink.h>
30 #include <asm/uaccess.h>
31 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
32 #include <linux/in6.h>
33 #endif
34
35 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
36 {
37 struct rtattr *rt = xfrma[type - 1];
38 struct xfrm_algo *algp;
39 int len;
40
41 if (!rt)
42 return 0;
43
44 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
45 if (len < 0)
46 return -EINVAL;
47
48 algp = RTA_DATA(rt);
49
50 len -= (algp->alg_key_len + 7U) / 8;
51 if (len < 0)
52 return -EINVAL;
53
54 switch (type) {
55 case XFRMA_ALG_AUTH:
56 if (!algp->alg_key_len &&
57 strcmp(algp->alg_name, "digest_null") != 0)
58 return -EINVAL;
59 break;
60
61 case XFRMA_ALG_CRYPT:
62 if (!algp->alg_key_len &&
63 strcmp(algp->alg_name, "cipher_null") != 0)
64 return -EINVAL;
65 break;
66
67 case XFRMA_ALG_COMP:
68 /* Zero length keys are legal. */
69 break;
70
71 default:
72 return -EINVAL;
73 };
74
75 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
76 return 0;
77 }
78
79 static int verify_encap_tmpl(struct rtattr **xfrma)
80 {
81 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
82 struct xfrm_encap_tmpl *encap;
83
84 if (!rt)
85 return 0;
86
87 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
88 return -EINVAL;
89
90 return 0;
91 }
92
93 static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
94 xfrm_address_t **addrp)
95 {
96 struct rtattr *rt = xfrma[type - 1];
97
98 if (!rt)
99 return 0;
100
101 if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
102 return -EINVAL;
103
104 if (addrp)
105 *addrp = RTA_DATA(rt);
106
107 return 0;
108 }
109
110 static inline int verify_sec_ctx_len(struct rtattr **xfrma)
111 {
112 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
113 struct xfrm_user_sec_ctx *uctx;
114 int len = 0;
115
116 if (!rt)
117 return 0;
118
119 if (rt->rta_len < sizeof(*uctx))
120 return -EINVAL;
121
122 uctx = RTA_DATA(rt);
123
124 len += sizeof(struct xfrm_user_sec_ctx);
125 len += uctx->ctx_len;
126
127 if (uctx->len != len)
128 return -EINVAL;
129
130 return 0;
131 }
132
133
134 static int verify_newsa_info(struct xfrm_usersa_info *p,
135 struct rtattr **xfrma)
136 {
137 int err;
138
139 err = -EINVAL;
140 switch (p->family) {
141 case AF_INET:
142 break;
143
144 case AF_INET6:
145 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
146 break;
147 #else
148 err = -EAFNOSUPPORT;
149 goto out;
150 #endif
151
152 default:
153 goto out;
154 };
155
156 err = -EINVAL;
157 switch (p->id.proto) {
158 case IPPROTO_AH:
159 if (!xfrma[XFRMA_ALG_AUTH-1] ||
160 xfrma[XFRMA_ALG_CRYPT-1] ||
161 xfrma[XFRMA_ALG_COMP-1])
162 goto out;
163 break;
164
165 case IPPROTO_ESP:
166 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
167 !xfrma[XFRMA_ALG_CRYPT-1]) ||
168 xfrma[XFRMA_ALG_COMP-1])
169 goto out;
170 break;
171
172 case IPPROTO_COMP:
173 if (!xfrma[XFRMA_ALG_COMP-1] ||
174 xfrma[XFRMA_ALG_AUTH-1] ||
175 xfrma[XFRMA_ALG_CRYPT-1])
176 goto out;
177 break;
178
179 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
180 case IPPROTO_DSTOPTS:
181 case IPPROTO_ROUTING:
182 if (xfrma[XFRMA_ALG_COMP-1] ||
183 xfrma[XFRMA_ALG_AUTH-1] ||
184 xfrma[XFRMA_ALG_CRYPT-1] ||
185 xfrma[XFRMA_ENCAP-1] ||
186 xfrma[XFRMA_SEC_CTX-1] ||
187 !xfrma[XFRMA_COADDR-1])
188 goto out;
189 break;
190 #endif
191
192 default:
193 goto out;
194 };
195
196 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
197 goto out;
198 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
199 goto out;
200 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
201 goto out;
202 if ((err = verify_encap_tmpl(xfrma)))
203 goto out;
204 if ((err = verify_sec_ctx_len(xfrma)))
205 goto out;
206 if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
207 goto out;
208
209 err = -EINVAL;
210 switch (p->mode) {
211 case XFRM_MODE_TRANSPORT:
212 case XFRM_MODE_TUNNEL:
213 case XFRM_MODE_ROUTEOPTIMIZATION:
214 break;
215
216 default:
217 goto out;
218 };
219
220 err = 0;
221
222 out:
223 return err;
224 }
225
226 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
227 struct xfrm_algo_desc *(*get_byname)(char *, int),
228 struct rtattr *u_arg)
229 {
230 struct rtattr *rta = u_arg;
231 struct xfrm_algo *p, *ualg;
232 struct xfrm_algo_desc *algo;
233 int len;
234
235 if (!rta)
236 return 0;
237
238 ualg = RTA_DATA(rta);
239
240 algo = get_byname(ualg->alg_name, 1);
241 if (!algo)
242 return -ENOSYS;
243 *props = algo->desc.sadb_alg_id;
244
245 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
246 p = kmalloc(len, GFP_KERNEL);
247 if (!p)
248 return -ENOMEM;
249
250 memcpy(p, ualg, len);
251 strcpy(p->alg_name, algo->name);
252 *algpp = p;
253 return 0;
254 }
255
256 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
257 {
258 struct rtattr *rta = u_arg;
259 struct xfrm_encap_tmpl *p, *uencap;
260
261 if (!rta)
262 return 0;
263
264 uencap = RTA_DATA(rta);
265 p = kmalloc(sizeof(*p), GFP_KERNEL);
266 if (!p)
267 return -ENOMEM;
268
269 memcpy(p, uencap, sizeof(*p));
270 *encapp = p;
271 return 0;
272 }
273
274
275 static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp)
276 {
277 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
278 int len = 0;
279
280 if (xfrm_ctx) {
281 len += sizeof(struct xfrm_user_sec_ctx);
282 len += xfrm_ctx->ctx_len;
283 }
284 return len;
285 }
286
287 static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
288 {
289 struct xfrm_user_sec_ctx *uctx;
290
291 if (!u_arg)
292 return 0;
293
294 uctx = RTA_DATA(u_arg);
295 return security_xfrm_state_alloc(x, uctx);
296 }
297
298 static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
299 {
300 struct rtattr *rta = u_arg;
301 xfrm_address_t *p, *uaddrp;
302
303 if (!rta)
304 return 0;
305
306 uaddrp = RTA_DATA(rta);
307 p = kmalloc(sizeof(*p), GFP_KERNEL);
308 if (!p)
309 return -ENOMEM;
310
311 memcpy(p, uaddrp, sizeof(*p));
312 *addrpp = p;
313 return 0;
314 }
315
316 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
317 {
318 memcpy(&x->id, &p->id, sizeof(x->id));
319 memcpy(&x->sel, &p->sel, sizeof(x->sel));
320 memcpy(&x->lft, &p->lft, sizeof(x->lft));
321 x->props.mode = p->mode;
322 x->props.replay_window = p->replay_window;
323 x->props.reqid = p->reqid;
324 x->props.family = p->family;
325 x->props.saddr = p->saddr;
326 x->props.flags = p->flags;
327 }
328
329 /*
330 * someday when pfkey also has support, we could have the code
331 * somehow made shareable and move it to xfrm_state.c - JHS
332 *
333 */
334 static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
335 {
336 int err = - EINVAL;
337 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
338 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
339 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
340 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
341
342 if (rp) {
343 struct xfrm_replay_state *replay;
344 if (RTA_PAYLOAD(rp) < sizeof(*replay))
345 goto error;
346 replay = RTA_DATA(rp);
347 memcpy(&x->replay, replay, sizeof(*replay));
348 memcpy(&x->preplay, replay, sizeof(*replay));
349 }
350
351 if (lt) {
352 struct xfrm_lifetime_cur *ltime;
353 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
354 goto error;
355 ltime = RTA_DATA(lt);
356 x->curlft.bytes = ltime->bytes;
357 x->curlft.packets = ltime->packets;
358 x->curlft.add_time = ltime->add_time;
359 x->curlft.use_time = ltime->use_time;
360 }
361
362 if (et) {
363 if (RTA_PAYLOAD(et) < sizeof(u32))
364 goto error;
365 x->replay_maxage = *(u32*)RTA_DATA(et);
366 }
367
368 if (rt) {
369 if (RTA_PAYLOAD(rt) < sizeof(u32))
370 goto error;
371 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
372 }
373
374 return 0;
375 error:
376 return err;
377 }
378
379 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
380 struct rtattr **xfrma,
381 int *errp)
382 {
383 struct xfrm_state *x = xfrm_state_alloc();
384 int err = -ENOMEM;
385
386 if (!x)
387 goto error_no_put;
388
389 copy_from_user_state(x, p);
390
391 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
392 xfrm_aalg_get_byname,
393 xfrma[XFRMA_ALG_AUTH-1])))
394 goto error;
395 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
396 xfrm_ealg_get_byname,
397 xfrma[XFRMA_ALG_CRYPT-1])))
398 goto error;
399 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
400 xfrm_calg_get_byname,
401 xfrma[XFRMA_ALG_COMP-1])))
402 goto error;
403 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
404 goto error;
405 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
406 goto error;
407 err = xfrm_init_state(x);
408 if (err)
409 goto error;
410
411 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
412 goto error;
413
414 x->km.seq = p->seq;
415 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
416 /* sysctl_xfrm_aevent_etime is in 100ms units */
417 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
418 x->preplay.bitmap = 0;
419 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
420 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
421
422 /* override default values from above */
423
424 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
425 if (err < 0)
426 goto error;
427
428 return x;
429
430 error:
431 x->km.state = XFRM_STATE_DEAD;
432 xfrm_state_put(x);
433 error_no_put:
434 *errp = err;
435 return NULL;
436 }
437
438 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
439 {
440 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
441 struct xfrm_state *x;
442 int err;
443 struct km_event c;
444
445 err = verify_newsa_info(p, (struct rtattr **)xfrma);
446 if (err)
447 return err;
448
449 x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err);
450 if (!x)
451 return err;
452
453 xfrm_state_hold(x);
454 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
455 err = xfrm_state_add(x);
456 else
457 err = xfrm_state_update(x);
458
459 if (err < 0) {
460 x->km.state = XFRM_STATE_DEAD;
461 __xfrm_state_put(x);
462 goto out;
463 }
464
465 c.seq = nlh->nlmsg_seq;
466 c.pid = nlh->nlmsg_pid;
467 c.event = nlh->nlmsg_type;
468
469 km_state_notify(x, &c);
470 out:
471 xfrm_state_put(x);
472 return err;
473 }
474
475 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
476 struct rtattr **xfrma,
477 int *errp)
478 {
479 struct xfrm_state *x = NULL;
480 int err;
481
482 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
483 err = -ESRCH;
484 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
485 } else {
486 xfrm_address_t *saddr = NULL;
487
488 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
489 if (err)
490 goto out;
491
492 if (!saddr) {
493 err = -EINVAL;
494 goto out;
495 }
496
497 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
498 p->family);
499 }
500
501 out:
502 if (!x && errp)
503 *errp = err;
504 return x;
505 }
506
507 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
508 {
509 struct xfrm_state *x;
510 int err = -ESRCH;
511 struct km_event c;
512 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
513
514 x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
515 if (x == NULL)
516 return err;
517
518 if ((err = security_xfrm_state_delete(x)) != 0)
519 goto out;
520
521 if (xfrm_state_kern(x)) {
522 err = -EPERM;
523 goto out;
524 }
525
526 err = xfrm_state_delete(x);
527 if (err < 0)
528 goto out;
529
530 c.seq = nlh->nlmsg_seq;
531 c.pid = nlh->nlmsg_pid;
532 c.event = nlh->nlmsg_type;
533 km_state_notify(x, &c);
534
535 out:
536 xfrm_state_put(x);
537 return err;
538 }
539
540 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
541 {
542 memcpy(&p->id, &x->id, sizeof(p->id));
543 memcpy(&p->sel, &x->sel, sizeof(p->sel));
544 memcpy(&p->lft, &x->lft, sizeof(p->lft));
545 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
546 memcpy(&p->stats, &x->stats, sizeof(p->stats));
547 p->saddr = x->props.saddr;
548 p->mode = x->props.mode;
549 p->replay_window = x->props.replay_window;
550 p->reqid = x->props.reqid;
551 p->family = x->props.family;
552 p->flags = x->props.flags;
553 p->seq = x->km.seq;
554 }
555
556 struct xfrm_dump_info {
557 struct sk_buff *in_skb;
558 struct sk_buff *out_skb;
559 u32 nlmsg_seq;
560 u16 nlmsg_flags;
561 int start_idx;
562 int this_idx;
563 };
564
565 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
566 {
567 struct xfrm_dump_info *sp = ptr;
568 struct sk_buff *in_skb = sp->in_skb;
569 struct sk_buff *skb = sp->out_skb;
570 struct xfrm_usersa_info *p;
571 struct nlmsghdr *nlh;
572 unsigned char *b = skb->tail;
573
574 if (sp->this_idx < sp->start_idx)
575 goto out;
576
577 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
578 sp->nlmsg_seq,
579 XFRM_MSG_NEWSA, sizeof(*p));
580 nlh->nlmsg_flags = sp->nlmsg_flags;
581
582 p = NLMSG_DATA(nlh);
583 copy_to_user_state(x, p);
584
585 if (x->aalg)
586 RTA_PUT(skb, XFRMA_ALG_AUTH,
587 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
588 if (x->ealg)
589 RTA_PUT(skb, XFRMA_ALG_CRYPT,
590 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
591 if (x->calg)
592 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
593
594 if (x->encap)
595 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
596
597 if (x->security) {
598 int ctx_size = sizeof(struct xfrm_sec_ctx) +
599 x->security->ctx_len;
600 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
601 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
602
603 uctx->exttype = XFRMA_SEC_CTX;
604 uctx->len = ctx_size;
605 uctx->ctx_doi = x->security->ctx_doi;
606 uctx->ctx_alg = x->security->ctx_alg;
607 uctx->ctx_len = x->security->ctx_len;
608 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
609 }
610
611 if (x->coaddr)
612 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
613
614 if (x->lastused)
615 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
616
617 nlh->nlmsg_len = skb->tail - b;
618 out:
619 sp->this_idx++;
620 return 0;
621
622 nlmsg_failure:
623 rtattr_failure:
624 skb_trim(skb, b - skb->data);
625 return -1;
626 }
627
628 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
629 {
630 struct xfrm_dump_info info;
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 info.this_idx = 0;
637 info.start_idx = cb->args[0];
638 (void) xfrm_state_walk(0, dump_one_state, &info);
639 cb->args[0] = info.this_idx;
640
641 return skb->len;
642 }
643
644 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
645 struct xfrm_state *x, u32 seq)
646 {
647 struct xfrm_dump_info info;
648 struct sk_buff *skb;
649
650 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
651 if (!skb)
652 return ERR_PTR(-ENOMEM);
653
654 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
655 info.in_skb = in_skb;
656 info.out_skb = skb;
657 info.nlmsg_seq = seq;
658 info.nlmsg_flags = 0;
659 info.this_idx = info.start_idx = 0;
660
661 if (dump_one_state(x, 0, &info)) {
662 kfree_skb(skb);
663 return NULL;
664 }
665
666 return skb;
667 }
668
669 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
670 {
671 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
672 struct xfrm_state *x;
673 struct sk_buff *resp_skb;
674 int err = -ESRCH;
675
676 x = xfrm_user_state_lookup(p, (struct rtattr **)xfrma, &err);
677 if (x == NULL)
678 goto out_noput;
679
680 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
681 if (IS_ERR(resp_skb)) {
682 err = PTR_ERR(resp_skb);
683 } else {
684 err = netlink_unicast(xfrm_nl, resp_skb,
685 NETLINK_CB(skb).pid, MSG_DONTWAIT);
686 }
687 xfrm_state_put(x);
688 out_noput:
689 return err;
690 }
691
692 static int verify_userspi_info(struct xfrm_userspi_info *p)
693 {
694 switch (p->info.id.proto) {
695 case IPPROTO_AH:
696 case IPPROTO_ESP:
697 break;
698
699 case IPPROTO_COMP:
700 /* IPCOMP spi is 16-bits. */
701 if (p->max >= 0x10000)
702 return -EINVAL;
703 break;
704
705 default:
706 return -EINVAL;
707 };
708
709 if (p->min > p->max)
710 return -EINVAL;
711
712 return 0;
713 }
714
715 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
716 {
717 struct xfrm_state *x;
718 struct xfrm_userspi_info *p;
719 struct sk_buff *resp_skb;
720 xfrm_address_t *daddr;
721 int family;
722 int err;
723
724 p = NLMSG_DATA(nlh);
725 err = verify_userspi_info(p);
726 if (err)
727 goto out_noput;
728
729 family = p->info.family;
730 daddr = &p->info.id.daddr;
731
732 x = NULL;
733 if (p->info.seq) {
734 x = xfrm_find_acq_byseq(p->info.seq);
735 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
736 xfrm_state_put(x);
737 x = NULL;
738 }
739 }
740
741 if (!x)
742 x = xfrm_find_acq(p->info.mode, p->info.reqid,
743 p->info.id.proto, daddr,
744 &p->info.saddr, 1,
745 family);
746 err = -ENOENT;
747 if (x == NULL)
748 goto out_noput;
749
750 resp_skb = ERR_PTR(-ENOENT);
751
752 spin_lock_bh(&x->lock);
753 if (x->km.state != XFRM_STATE_DEAD) {
754 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
755 if (x->id.spi)
756 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
757 }
758 spin_unlock_bh(&x->lock);
759
760 if (IS_ERR(resp_skb)) {
761 err = PTR_ERR(resp_skb);
762 goto out;
763 }
764
765 err = netlink_unicast(xfrm_nl, resp_skb,
766 NETLINK_CB(skb).pid, MSG_DONTWAIT);
767
768 out:
769 xfrm_state_put(x);
770 out_noput:
771 return err;
772 }
773
774 static int verify_policy_dir(__u8 dir)
775 {
776 switch (dir) {
777 case XFRM_POLICY_IN:
778 case XFRM_POLICY_OUT:
779 case XFRM_POLICY_FWD:
780 break;
781
782 default:
783 return -EINVAL;
784 };
785
786 return 0;
787 }
788
789 static int verify_policy_type(__u8 type)
790 {
791 switch (type) {
792 case XFRM_POLICY_TYPE_MAIN:
793 #ifdef CONFIG_XFRM_SUB_POLICY
794 case XFRM_POLICY_TYPE_SUB:
795 #endif
796 break;
797
798 default:
799 return -EINVAL;
800 };
801
802 return 0;
803 }
804
805 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
806 {
807 switch (p->share) {
808 case XFRM_SHARE_ANY:
809 case XFRM_SHARE_SESSION:
810 case XFRM_SHARE_USER:
811 case XFRM_SHARE_UNIQUE:
812 break;
813
814 default:
815 return -EINVAL;
816 };
817
818 switch (p->action) {
819 case XFRM_POLICY_ALLOW:
820 case XFRM_POLICY_BLOCK:
821 break;
822
823 default:
824 return -EINVAL;
825 };
826
827 switch (p->sel.family) {
828 case AF_INET:
829 break;
830
831 case AF_INET6:
832 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
833 break;
834 #else
835 return -EAFNOSUPPORT;
836 #endif
837
838 default:
839 return -EINVAL;
840 };
841
842 return verify_policy_dir(p->dir);
843 }
844
845 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
846 {
847 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
848 struct xfrm_user_sec_ctx *uctx;
849
850 if (!rt)
851 return 0;
852
853 uctx = RTA_DATA(rt);
854 return security_xfrm_policy_alloc(pol, uctx);
855 }
856
857 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
858 int nr)
859 {
860 int i;
861
862 xp->xfrm_nr = nr;
863 for (i = 0; i < nr; i++, ut++) {
864 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
865
866 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
867 memcpy(&t->saddr, &ut->saddr,
868 sizeof(xfrm_address_t));
869 t->reqid = ut->reqid;
870 t->mode = ut->mode;
871 t->share = ut->share;
872 t->optional = ut->optional;
873 t->aalgos = ut->aalgos;
874 t->ealgos = ut->ealgos;
875 t->calgos = ut->calgos;
876 }
877 }
878
879 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
880 {
881 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
882 struct xfrm_user_tmpl *utmpl;
883 int nr;
884
885 if (!rt) {
886 pol->xfrm_nr = 0;
887 } else {
888 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
889
890 if (nr > XFRM_MAX_DEPTH)
891 return -EINVAL;
892
893 copy_templates(pol, RTA_DATA(rt), nr);
894 }
895 return 0;
896 }
897
898 static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
899 {
900 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
901 struct xfrm_userpolicy_type *upt;
902 __u8 type = XFRM_POLICY_TYPE_MAIN;
903 int err;
904
905 if (rt) {
906 if (rt->rta_len < sizeof(*upt))
907 return -EINVAL;
908
909 upt = RTA_DATA(rt);
910 type = upt->type;
911 }
912
913 err = verify_policy_type(type);
914 if (err)
915 return err;
916
917 *tp = type;
918 return 0;
919 }
920
921 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
922 {
923 xp->priority = p->priority;
924 xp->index = p->index;
925 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
926 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
927 xp->action = p->action;
928 xp->flags = p->flags;
929 xp->family = p->sel.family;
930 /* XXX xp->share = p->share; */
931 }
932
933 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
934 {
935 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
936 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
937 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
938 p->priority = xp->priority;
939 p->index = xp->index;
940 p->sel.family = xp->family;
941 p->dir = dir;
942 p->action = xp->action;
943 p->flags = xp->flags;
944 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
945 }
946
947 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
948 {
949 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
950 int err;
951
952 if (!xp) {
953 *errp = -ENOMEM;
954 return NULL;
955 }
956
957 copy_from_user_policy(xp, p);
958
959 err = copy_from_user_policy_type(&xp->type, xfrma);
960 if (err)
961 goto error;
962
963 if (!(err = copy_from_user_tmpl(xp, xfrma)))
964 err = copy_from_user_sec_ctx(xp, xfrma);
965 if (err)
966 goto error;
967
968 return xp;
969 error:
970 *errp = err;
971 kfree(xp);
972 return NULL;
973 }
974
975 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
976 {
977 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
978 struct xfrm_policy *xp;
979 struct km_event c;
980 int err;
981 int excl;
982
983 err = verify_newpolicy_info(p);
984 if (err)
985 return err;
986 err = verify_sec_ctx_len((struct rtattr **)xfrma);
987 if (err)
988 return err;
989
990 xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err);
991 if (!xp)
992 return err;
993
994 /* shouldnt excl be based on nlh flags??
995 * Aha! this is anti-netlink really i.e more pfkey derived
996 * in netlink excl is a flag and you wouldnt need
997 * a type XFRM_MSG_UPDPOLICY - JHS */
998 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
999 err = xfrm_policy_insert(p->dir, xp, excl);
1000 if (err) {
1001 security_xfrm_policy_free(xp);
1002 kfree(xp);
1003 return err;
1004 }
1005
1006 c.event = nlh->nlmsg_type;
1007 c.seq = nlh->nlmsg_seq;
1008 c.pid = nlh->nlmsg_pid;
1009 km_policy_notify(xp, p->dir, &c);
1010
1011 xfrm_pol_put(xp);
1012
1013 return 0;
1014 }
1015
1016 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1017 {
1018 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1019 int i;
1020
1021 if (xp->xfrm_nr == 0)
1022 return 0;
1023
1024 for (i = 0; i < xp->xfrm_nr; i++) {
1025 struct xfrm_user_tmpl *up = &vec[i];
1026 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1027
1028 memcpy(&up->id, &kp->id, sizeof(up->id));
1029 up->family = xp->family;
1030 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1031 up->reqid = kp->reqid;
1032 up->mode = kp->mode;
1033 up->share = kp->share;
1034 up->optional = kp->optional;
1035 up->aalgos = kp->aalgos;
1036 up->ealgos = kp->ealgos;
1037 up->calgos = kp->calgos;
1038 }
1039 RTA_PUT(skb, XFRMA_TMPL,
1040 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1041 vec);
1042
1043 return 0;
1044
1045 rtattr_failure:
1046 return -1;
1047 }
1048
1049 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1050 {
1051 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1052 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1053 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1054
1055 uctx->exttype = XFRMA_SEC_CTX;
1056 uctx->len = ctx_size;
1057 uctx->ctx_doi = s->ctx_doi;
1058 uctx->ctx_alg = s->ctx_alg;
1059 uctx->ctx_len = s->ctx_len;
1060 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1061 return 0;
1062
1063 rtattr_failure:
1064 return -1;
1065 }
1066
1067 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1068 {
1069 if (x->security) {
1070 return copy_sec_ctx(x->security, skb);
1071 }
1072 return 0;
1073 }
1074
1075 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1076 {
1077 if (xp->security) {
1078 return copy_sec_ctx(xp->security, skb);
1079 }
1080 return 0;
1081 }
1082
1083 #ifdef CONFIG_XFRM_SUB_POLICY
1084 static int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
1085 {
1086 struct xfrm_userpolicy_type upt;
1087
1088 memset(&upt, 0, sizeof(upt));
1089 upt.type = xp->type;
1090
1091 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1092
1093 return 0;
1094
1095 rtattr_failure:
1096 return -1;
1097 }
1098
1099 #else
1100 static inline int copy_to_user_policy_type(struct xfrm_policy *xp, struct sk_buff *skb)
1101 {
1102 return 0;
1103 }
1104 #endif
1105
1106 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1107 {
1108 struct xfrm_dump_info *sp = ptr;
1109 struct xfrm_userpolicy_info *p;
1110 struct sk_buff *in_skb = sp->in_skb;
1111 struct sk_buff *skb = sp->out_skb;
1112 struct nlmsghdr *nlh;
1113 unsigned char *b = skb->tail;
1114
1115 if (sp->this_idx < sp->start_idx)
1116 goto out;
1117
1118 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1119 sp->nlmsg_seq,
1120 XFRM_MSG_NEWPOLICY, sizeof(*p));
1121 p = NLMSG_DATA(nlh);
1122 nlh->nlmsg_flags = sp->nlmsg_flags;
1123
1124 copy_to_user_policy(xp, p, dir);
1125 if (copy_to_user_tmpl(xp, skb) < 0)
1126 goto nlmsg_failure;
1127 if (copy_to_user_sec_ctx(xp, skb))
1128 goto nlmsg_failure;
1129 if (copy_to_user_policy_type(xp, skb) < 0)
1130 goto nlmsg_failure;
1131
1132 nlh->nlmsg_len = skb->tail - b;
1133 out:
1134 sp->this_idx++;
1135 return 0;
1136
1137 nlmsg_failure:
1138 skb_trim(skb, b - skb->data);
1139 return -1;
1140 }
1141
1142 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1143 {
1144 struct xfrm_dump_info info;
1145
1146 info.in_skb = cb->skb;
1147 info.out_skb = skb;
1148 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1149 info.nlmsg_flags = NLM_F_MULTI;
1150 info.this_idx = 0;
1151 info.start_idx = cb->args[0];
1152 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1153 #ifdef CONFIG_XFRM_SUB_POLICY
1154 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1155 #endif
1156 cb->args[0] = info.this_idx;
1157
1158 return skb->len;
1159 }
1160
1161 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1162 struct xfrm_policy *xp,
1163 int dir, u32 seq)
1164 {
1165 struct xfrm_dump_info info;
1166 struct sk_buff *skb;
1167
1168 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1169 if (!skb)
1170 return ERR_PTR(-ENOMEM);
1171
1172 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
1173 info.in_skb = in_skb;
1174 info.out_skb = skb;
1175 info.nlmsg_seq = seq;
1176 info.nlmsg_flags = 0;
1177 info.this_idx = info.start_idx = 0;
1178
1179 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1180 kfree_skb(skb);
1181 return NULL;
1182 }
1183
1184 return skb;
1185 }
1186
1187 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1188 {
1189 struct xfrm_policy *xp;
1190 struct xfrm_userpolicy_id *p;
1191 __u8 type = XFRM_POLICY_TYPE_MAIN;
1192 int err;
1193 struct km_event c;
1194 int delete;
1195
1196 p = NLMSG_DATA(nlh);
1197 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1198
1199 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1200 if (err)
1201 return err;
1202
1203 err = verify_policy_dir(p->dir);
1204 if (err)
1205 return err;
1206
1207 if (p->index)
1208 xp = xfrm_policy_byid(type, p->dir, p->index, delete);
1209 else {
1210 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1211 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1212 struct xfrm_policy tmp;
1213
1214 err = verify_sec_ctx_len(rtattrs);
1215 if (err)
1216 return err;
1217
1218 memset(&tmp, 0, sizeof(struct xfrm_policy));
1219 if (rt) {
1220 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1221
1222 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1223 return err;
1224 }
1225 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
1226 security_xfrm_policy_free(&tmp);
1227 }
1228 if (xp == NULL)
1229 return -ENOENT;
1230
1231 if (!delete) {
1232 struct sk_buff *resp_skb;
1233
1234 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1235 if (IS_ERR(resp_skb)) {
1236 err = PTR_ERR(resp_skb);
1237 } else {
1238 err = netlink_unicast(xfrm_nl, resp_skb,
1239 NETLINK_CB(skb).pid,
1240 MSG_DONTWAIT);
1241 }
1242 } else {
1243 if ((err = security_xfrm_policy_delete(xp)) != 0)
1244 goto out;
1245 c.data.byid = p->index;
1246 c.event = nlh->nlmsg_type;
1247 c.seq = nlh->nlmsg_seq;
1248 c.pid = nlh->nlmsg_pid;
1249 km_policy_notify(xp, p->dir, &c);
1250 }
1251
1252 xfrm_pol_put(xp);
1253
1254 out:
1255 return err;
1256 }
1257
1258 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1259 {
1260 struct km_event c;
1261 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1262
1263 xfrm_state_flush(p->proto);
1264 c.data.proto = p->proto;
1265 c.event = nlh->nlmsg_type;
1266 c.seq = nlh->nlmsg_seq;
1267 c.pid = nlh->nlmsg_pid;
1268 km_state_notify(NULL, &c);
1269
1270 return 0;
1271 }
1272
1273
1274 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1275 {
1276 struct xfrm_aevent_id *id;
1277 struct nlmsghdr *nlh;
1278 struct xfrm_lifetime_cur ltime;
1279 unsigned char *b = skb->tail;
1280
1281 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1282 id = NLMSG_DATA(nlh);
1283 nlh->nlmsg_flags = 0;
1284
1285 id->sa_id.daddr = x->id.daddr;
1286 id->sa_id.spi = x->id.spi;
1287 id->sa_id.family = x->props.family;
1288 id->sa_id.proto = x->id.proto;
1289 id->flags = c->data.aevent;
1290
1291 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1292
1293 ltime.bytes = x->curlft.bytes;
1294 ltime.packets = x->curlft.packets;
1295 ltime.add_time = x->curlft.add_time;
1296 ltime.use_time = x->curlft.use_time;
1297
1298 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1299
1300 if (id->flags&XFRM_AE_RTHR) {
1301 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1302 }
1303
1304 if (id->flags&XFRM_AE_ETHR) {
1305 u32 etimer = x->replay_maxage*10/HZ;
1306 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1307 }
1308
1309 nlh->nlmsg_len = skb->tail - b;
1310 return skb->len;
1311
1312 rtattr_failure:
1313 nlmsg_failure:
1314 skb_trim(skb, b - skb->data);
1315 return -1;
1316 }
1317
1318 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1319 {
1320 struct xfrm_state *x;
1321 struct sk_buff *r_skb;
1322 int err;
1323 struct km_event c;
1324 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1325 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1326 struct xfrm_usersa_id *id = &p->sa_id;
1327
1328 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1329 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1330
1331 if (p->flags&XFRM_AE_RTHR)
1332 len+=RTA_SPACE(sizeof(u32));
1333
1334 if (p->flags&XFRM_AE_ETHR)
1335 len+=RTA_SPACE(sizeof(u32));
1336
1337 r_skb = alloc_skb(len, GFP_ATOMIC);
1338 if (r_skb == NULL)
1339 return -ENOMEM;
1340
1341 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1342 if (x == NULL) {
1343 kfree(r_skb);
1344 return -ESRCH;
1345 }
1346
1347 /*
1348 * XXX: is this lock really needed - none of the other
1349 * gets lock (the concern is things getting updated
1350 * while we are still reading) - jhs
1351 */
1352 spin_lock_bh(&x->lock);
1353 c.data.aevent = p->flags;
1354 c.seq = nlh->nlmsg_seq;
1355 c.pid = nlh->nlmsg_pid;
1356
1357 if (build_aevent(r_skb, x, &c) < 0)
1358 BUG();
1359 err = netlink_unicast(xfrm_nl, r_skb,
1360 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1361 spin_unlock_bh(&x->lock);
1362 xfrm_state_put(x);
1363 return err;
1364 }
1365
1366 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1367 {
1368 struct xfrm_state *x;
1369 struct km_event c;
1370 int err = - EINVAL;
1371 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1372 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1373 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1374
1375 if (!lt && !rp)
1376 return err;
1377
1378 /* pedantic mode - thou shalt sayeth replaceth */
1379 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1380 return err;
1381
1382 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1383 if (x == NULL)
1384 return -ESRCH;
1385
1386 if (x->km.state != XFRM_STATE_VALID)
1387 goto out;
1388
1389 spin_lock_bh(&x->lock);
1390 err = xfrm_update_ae_params(x,(struct rtattr **)xfrma);
1391 spin_unlock_bh(&x->lock);
1392 if (err < 0)
1393 goto out;
1394
1395 c.event = nlh->nlmsg_type;
1396 c.seq = nlh->nlmsg_seq;
1397 c.pid = nlh->nlmsg_pid;
1398 c.data.aevent = XFRM_AE_CU;
1399 km_state_notify(x, &c);
1400 err = 0;
1401 out:
1402 xfrm_state_put(x);
1403 return err;
1404 }
1405
1406 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1407 {
1408 struct km_event c;
1409 __u8 type = XFRM_POLICY_TYPE_MAIN;
1410 int err;
1411
1412 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1413 if (err)
1414 return err;
1415
1416 xfrm_policy_flush(type);
1417 c.data.type = type;
1418 c.event = nlh->nlmsg_type;
1419 c.seq = nlh->nlmsg_seq;
1420 c.pid = nlh->nlmsg_pid;
1421 km_policy_notify(NULL, 0, &c);
1422 return 0;
1423 }
1424
1425 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1426 {
1427 struct xfrm_policy *xp;
1428 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1429 struct xfrm_userpolicy_info *p = &up->pol;
1430 __u8 type = XFRM_POLICY_TYPE_MAIN;
1431 int err = -ENOENT;
1432
1433 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1434 if (err)
1435 return err;
1436
1437 if (p->index)
1438 xp = xfrm_policy_byid(type, p->dir, p->index, 0);
1439 else {
1440 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1441 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1442 struct xfrm_policy tmp;
1443
1444 err = verify_sec_ctx_len(rtattrs);
1445 if (err)
1446 return err;
1447
1448 memset(&tmp, 0, sizeof(struct xfrm_policy));
1449 if (rt) {
1450 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1451
1452 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1453 return err;
1454 }
1455 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0);
1456 security_xfrm_policy_free(&tmp);
1457 }
1458
1459 if (xp == NULL)
1460 return err;
1461 read_lock(&xp->lock);
1462 if (xp->dead) {
1463 read_unlock(&xp->lock);
1464 goto out;
1465 }
1466
1467 read_unlock(&xp->lock);
1468 err = 0;
1469 if (up->hard) {
1470 xfrm_policy_delete(xp, p->dir);
1471 } else {
1472 // reset the timers here?
1473 printk("Dont know what to do with soft policy expire\n");
1474 }
1475 km_policy_expired(xp, p->dir, up->hard, current->pid);
1476
1477 out:
1478 xfrm_pol_put(xp);
1479 return err;
1480 }
1481
1482 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1483 {
1484 struct xfrm_state *x;
1485 int err;
1486 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1487 struct xfrm_usersa_info *p = &ue->state;
1488
1489 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1490 err = -ENOENT;
1491
1492 if (x == NULL)
1493 return err;
1494
1495 err = -EINVAL;
1496
1497 spin_lock_bh(&x->lock);
1498 if (x->km.state != XFRM_STATE_VALID)
1499 goto out;
1500 km_state_expired(x, ue->hard, current->pid);
1501
1502 if (ue->hard)
1503 __xfrm_state_delete(x);
1504 out:
1505 spin_unlock_bh(&x->lock);
1506 xfrm_state_put(x);
1507 return err;
1508 }
1509
1510 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1511 {
1512 struct xfrm_policy *xp;
1513 struct xfrm_user_tmpl *ut;
1514 int i;
1515 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1516
1517 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1518 struct xfrm_state *x = xfrm_state_alloc();
1519 int err = -ENOMEM;
1520
1521 if (!x)
1522 return err;
1523
1524 err = verify_newpolicy_info(&ua->policy);
1525 if (err) {
1526 printk("BAD policy passed\n");
1527 kfree(x);
1528 return err;
1529 }
1530
1531 /* build an XP */
1532 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) {
1533 kfree(x);
1534 return err;
1535 }
1536
1537 memcpy(&x->id, &ua->id, sizeof(ua->id));
1538 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1539 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1540
1541 ut = RTA_DATA(rt);
1542 /* extract the templates and for each call km_key */
1543 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1544 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1545 memcpy(&x->id, &t->id, sizeof(x->id));
1546 x->props.mode = t->mode;
1547 x->props.reqid = t->reqid;
1548 x->props.family = ut->family;
1549 t->aalgos = ua->aalgos;
1550 t->ealgos = ua->ealgos;
1551 t->calgos = ua->calgos;
1552 err = km_query(x, t, xp);
1553
1554 }
1555
1556 kfree(x);
1557 kfree(xp);
1558
1559 return 0;
1560 }
1561
1562
1563 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1564
1565 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1566 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1567 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1568 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1569 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1570 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1571 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1572 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1573 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1574 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1575 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1576 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1577 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1578 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1579 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
1580 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1581 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1582 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1583 };
1584
1585 #undef XMSGSIZE
1586
1587 static struct xfrm_link {
1588 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
1589 int (*dump)(struct sk_buff *, struct netlink_callback *);
1590 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1591 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1592 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1593 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1594 .dump = xfrm_dump_sa },
1595 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1596 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1597 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1598 .dump = xfrm_dump_policy },
1599 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1600 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1601 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1602 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1603 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1604 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1605 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1606 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1607 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1608 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1609 };
1610
1611 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
1612 {
1613 struct rtattr *xfrma[XFRMA_MAX];
1614 struct xfrm_link *link;
1615 int type, min_len;
1616
1617 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
1618 return 0;
1619
1620 type = nlh->nlmsg_type;
1621
1622 /* A control message: ignore them */
1623 if (type < XFRM_MSG_BASE)
1624 return 0;
1625
1626 /* Unknown message: reply with EINVAL */
1627 if (type > XFRM_MSG_MAX)
1628 goto err_einval;
1629
1630 type -= XFRM_MSG_BASE;
1631 link = &xfrm_dispatch[type];
1632
1633 /* All operations require privileges, even GET */
1634 if (security_netlink_recv(skb, CAP_NET_ADMIN)) {
1635 *errp = -EPERM;
1636 return -1;
1637 }
1638
1639 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1640 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1641 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1642 if (link->dump == NULL)
1643 goto err_einval;
1644
1645 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
1646 link->dump, NULL)) != 0) {
1647 return -1;
1648 }
1649
1650 netlink_queue_skip(nlh, skb);
1651 return -1;
1652 }
1653
1654 memset(xfrma, 0, sizeof(xfrma));
1655
1656 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1657 goto err_einval;
1658
1659 if (nlh->nlmsg_len > min_len) {
1660 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1661 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1662
1663 while (RTA_OK(attr, attrlen)) {
1664 unsigned short flavor = attr->rta_type;
1665 if (flavor) {
1666 if (flavor > XFRMA_MAX)
1667 goto err_einval;
1668 xfrma[flavor - 1] = attr;
1669 }
1670 attr = RTA_NEXT(attr, attrlen);
1671 }
1672 }
1673
1674 if (link->doit == NULL)
1675 goto err_einval;
1676 *errp = link->doit(skb, nlh, (void **) &xfrma);
1677
1678 return *errp;
1679
1680 err_einval:
1681 *errp = -EINVAL;
1682 return -1;
1683 }
1684
1685 static void xfrm_netlink_rcv(struct sock *sk, int len)
1686 {
1687 unsigned int qlen = 0;
1688
1689 do {
1690 mutex_lock(&xfrm_cfg_mutex);
1691 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
1692 mutex_unlock(&xfrm_cfg_mutex);
1693
1694 } while (qlen);
1695 }
1696
1697 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1698 {
1699 struct xfrm_user_expire *ue;
1700 struct nlmsghdr *nlh;
1701 unsigned char *b = skb->tail;
1702
1703 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1704 sizeof(*ue));
1705 ue = NLMSG_DATA(nlh);
1706 nlh->nlmsg_flags = 0;
1707
1708 copy_to_user_state(x, &ue->state);
1709 ue->hard = (c->data.hard != 0) ? 1 : 0;
1710
1711 nlh->nlmsg_len = skb->tail - b;
1712 return skb->len;
1713
1714 nlmsg_failure:
1715 skb_trim(skb, b - skb->data);
1716 return -1;
1717 }
1718
1719 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1720 {
1721 struct sk_buff *skb;
1722 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1723
1724 skb = alloc_skb(len, GFP_ATOMIC);
1725 if (skb == NULL)
1726 return -ENOMEM;
1727
1728 if (build_expire(skb, x, c) < 0)
1729 BUG();
1730
1731 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1732 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1733 }
1734
1735 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1736 {
1737 struct sk_buff *skb;
1738 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1739
1740 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1741 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1742 skb = alloc_skb(len, GFP_ATOMIC);
1743 if (skb == NULL)
1744 return -ENOMEM;
1745
1746 if (build_aevent(skb, x, c) < 0)
1747 BUG();
1748
1749 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
1750 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1751 }
1752
1753 static int xfrm_notify_sa_flush(struct km_event *c)
1754 {
1755 struct xfrm_usersa_flush *p;
1756 struct nlmsghdr *nlh;
1757 struct sk_buff *skb;
1758 unsigned char *b;
1759 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1760
1761 skb = alloc_skb(len, GFP_ATOMIC);
1762 if (skb == NULL)
1763 return -ENOMEM;
1764 b = skb->tail;
1765
1766 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1767 XFRM_MSG_FLUSHSA, sizeof(*p));
1768 nlh->nlmsg_flags = 0;
1769
1770 p = NLMSG_DATA(nlh);
1771 p->proto = c->data.proto;
1772
1773 nlh->nlmsg_len = skb->tail - b;
1774
1775 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1776 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1777
1778 nlmsg_failure:
1779 kfree_skb(skb);
1780 return -1;
1781 }
1782
1783 static int inline xfrm_sa_len(struct xfrm_state *x)
1784 {
1785 int l = 0;
1786 if (x->aalg)
1787 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1788 if (x->ealg)
1789 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1790 if (x->calg)
1791 l += RTA_SPACE(sizeof(*x->calg));
1792 if (x->encap)
1793 l += RTA_SPACE(sizeof(*x->encap));
1794
1795 return l;
1796 }
1797
1798 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1799 {
1800 struct xfrm_usersa_info *p;
1801 struct xfrm_usersa_id *id;
1802 struct nlmsghdr *nlh;
1803 struct sk_buff *skb;
1804 unsigned char *b;
1805 int len = xfrm_sa_len(x);
1806 int headlen;
1807
1808 headlen = sizeof(*p);
1809 if (c->event == XFRM_MSG_DELSA) {
1810 len += RTA_SPACE(headlen);
1811 headlen = sizeof(*id);
1812 }
1813 len += NLMSG_SPACE(headlen);
1814
1815 skb = alloc_skb(len, GFP_ATOMIC);
1816 if (skb == NULL)
1817 return -ENOMEM;
1818 b = skb->tail;
1819
1820 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1821 nlh->nlmsg_flags = 0;
1822
1823 p = NLMSG_DATA(nlh);
1824 if (c->event == XFRM_MSG_DELSA) {
1825 id = NLMSG_DATA(nlh);
1826 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1827 id->spi = x->id.spi;
1828 id->family = x->props.family;
1829 id->proto = x->id.proto;
1830
1831 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1832 }
1833
1834 copy_to_user_state(x, p);
1835
1836 if (x->aalg)
1837 RTA_PUT(skb, XFRMA_ALG_AUTH,
1838 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1839 if (x->ealg)
1840 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1841 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1842 if (x->calg)
1843 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1844
1845 if (x->encap)
1846 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1847
1848 nlh->nlmsg_len = skb->tail - b;
1849
1850 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1851 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1852
1853 nlmsg_failure:
1854 rtattr_failure:
1855 kfree_skb(skb);
1856 return -1;
1857 }
1858
1859 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1860 {
1861
1862 switch (c->event) {
1863 case XFRM_MSG_EXPIRE:
1864 return xfrm_exp_state_notify(x, c);
1865 case XFRM_MSG_NEWAE:
1866 return xfrm_aevent_state_notify(x, c);
1867 case XFRM_MSG_DELSA:
1868 case XFRM_MSG_UPDSA:
1869 case XFRM_MSG_NEWSA:
1870 return xfrm_notify_sa(x, c);
1871 case XFRM_MSG_FLUSHSA:
1872 return xfrm_notify_sa_flush(c);
1873 default:
1874 printk("xfrm_user: Unknown SA event %d\n", c->event);
1875 break;
1876 }
1877
1878 return 0;
1879
1880 }
1881
1882 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1883 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1884 int dir)
1885 {
1886 struct xfrm_user_acquire *ua;
1887 struct nlmsghdr *nlh;
1888 unsigned char *b = skb->tail;
1889 __u32 seq = xfrm_get_acqseq();
1890
1891 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1892 sizeof(*ua));
1893 ua = NLMSG_DATA(nlh);
1894 nlh->nlmsg_flags = 0;
1895
1896 memcpy(&ua->id, &x->id, sizeof(ua->id));
1897 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1898 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1899 copy_to_user_policy(xp, &ua->policy, dir);
1900 ua->aalgos = xt->aalgos;
1901 ua->ealgos = xt->ealgos;
1902 ua->calgos = xt->calgos;
1903 ua->seq = x->km.seq = seq;
1904
1905 if (copy_to_user_tmpl(xp, skb) < 0)
1906 goto nlmsg_failure;
1907 if (copy_to_user_state_sec_ctx(x, skb))
1908 goto nlmsg_failure;
1909 if (copy_to_user_policy_type(xp, skb) < 0)
1910 goto nlmsg_failure;
1911
1912 nlh->nlmsg_len = skb->tail - b;
1913 return skb->len;
1914
1915 nlmsg_failure:
1916 skb_trim(skb, b - skb->data);
1917 return -1;
1918 }
1919
1920 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1921 struct xfrm_policy *xp, int dir)
1922 {
1923 struct sk_buff *skb;
1924 size_t len;
1925
1926 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1927 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1928 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
1929 skb = alloc_skb(len, GFP_ATOMIC);
1930 if (skb == NULL)
1931 return -ENOMEM;
1932
1933 if (build_acquire(skb, x, xt, xp, dir) < 0)
1934 BUG();
1935
1936 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
1937 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1938 }
1939
1940 /* User gives us xfrm_user_policy_info followed by an array of 0
1941 * or more templates.
1942 */
1943 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1944 u8 *data, int len, int *dir)
1945 {
1946 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1947 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1948 struct xfrm_policy *xp;
1949 int nr;
1950
1951 switch (sk->sk_family) {
1952 case AF_INET:
1953 if (opt != IP_XFRM_POLICY) {
1954 *dir = -EOPNOTSUPP;
1955 return NULL;
1956 }
1957 break;
1958 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1959 case AF_INET6:
1960 if (opt != IPV6_XFRM_POLICY) {
1961 *dir = -EOPNOTSUPP;
1962 return NULL;
1963 }
1964 break;
1965 #endif
1966 default:
1967 *dir = -EINVAL;
1968 return NULL;
1969 }
1970
1971 *dir = -EINVAL;
1972
1973 if (len < sizeof(*p) ||
1974 verify_newpolicy_info(p))
1975 return NULL;
1976
1977 nr = ((len - sizeof(*p)) / sizeof(*ut));
1978 if (nr > XFRM_MAX_DEPTH)
1979 return NULL;
1980
1981 if (p->dir > XFRM_POLICY_OUT)
1982 return NULL;
1983
1984 xp = xfrm_policy_alloc(GFP_KERNEL);
1985 if (xp == NULL) {
1986 *dir = -ENOBUFS;
1987 return NULL;
1988 }
1989
1990 copy_from_user_policy(xp, p);
1991 xp->type = XFRM_POLICY_TYPE_MAIN;
1992 copy_templates(xp, ut, nr);
1993
1994 if (!xp->security) {
1995 int err = security_xfrm_sock_policy_alloc(xp, sk);
1996 if (err) {
1997 kfree(xp);
1998 *dir = err;
1999 return NULL;
2000 }
2001 }
2002
2003 *dir = p->dir;
2004
2005 return xp;
2006 }
2007
2008 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2009 int dir, struct km_event *c)
2010 {
2011 struct xfrm_user_polexpire *upe;
2012 struct nlmsghdr *nlh;
2013 int hard = c->data.hard;
2014 unsigned char *b = skb->tail;
2015
2016 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
2017 upe = NLMSG_DATA(nlh);
2018 nlh->nlmsg_flags = 0;
2019
2020 copy_to_user_policy(xp, &upe->pol, dir);
2021 if (copy_to_user_tmpl(xp, skb) < 0)
2022 goto nlmsg_failure;
2023 if (copy_to_user_sec_ctx(xp, skb))
2024 goto nlmsg_failure;
2025 if (copy_to_user_policy_type(xp, skb) < 0)
2026 goto nlmsg_failure;
2027 upe->hard = !!hard;
2028
2029 nlh->nlmsg_len = skb->tail - b;
2030 return skb->len;
2031
2032 nlmsg_failure:
2033 skb_trim(skb, b - skb->data);
2034 return -1;
2035 }
2036
2037 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2038 {
2039 struct sk_buff *skb;
2040 size_t len;
2041
2042 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2043 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2044 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
2045 skb = alloc_skb(len, GFP_ATOMIC);
2046 if (skb == NULL)
2047 return -ENOMEM;
2048
2049 if (build_polexpire(skb, xp, dir, c) < 0)
2050 BUG();
2051
2052 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2053 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2054 }
2055
2056 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2057 {
2058 struct xfrm_userpolicy_info *p;
2059 struct xfrm_userpolicy_id *id;
2060 struct nlmsghdr *nlh;
2061 struct sk_buff *skb;
2062 unsigned char *b;
2063 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2064 int headlen;
2065
2066 headlen = sizeof(*p);
2067 if (c->event == XFRM_MSG_DELPOLICY) {
2068 len += RTA_SPACE(headlen);
2069 headlen = sizeof(*id);
2070 }
2071 len += NLMSG_SPACE(headlen);
2072
2073 skb = alloc_skb(len, GFP_ATOMIC);
2074 if (skb == NULL)
2075 return -ENOMEM;
2076 b = skb->tail;
2077
2078 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2079
2080 p = NLMSG_DATA(nlh);
2081 if (c->event == XFRM_MSG_DELPOLICY) {
2082 id = NLMSG_DATA(nlh);
2083 memset(id, 0, sizeof(*id));
2084 id->dir = dir;
2085 if (c->data.byid)
2086 id->index = xp->index;
2087 else
2088 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2089
2090 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2091 }
2092
2093 nlh->nlmsg_flags = 0;
2094
2095 copy_to_user_policy(xp, p, dir);
2096 if (copy_to_user_tmpl(xp, skb) < 0)
2097 goto nlmsg_failure;
2098 if (copy_to_user_policy_type(xp, skb) < 0)
2099 goto nlmsg_failure;
2100
2101 nlh->nlmsg_len = skb->tail - b;
2102
2103 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2104 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2105
2106 nlmsg_failure:
2107 rtattr_failure:
2108 kfree_skb(skb);
2109 return -1;
2110 }
2111
2112 static int xfrm_notify_policy_flush(struct km_event *c)
2113 {
2114 struct nlmsghdr *nlh;
2115 struct sk_buff *skb;
2116 unsigned char *b;
2117 #ifdef CONFIG_XFRM_SUB_POLICY
2118 struct xfrm_userpolicy_type upt;
2119 #endif
2120 int len = NLMSG_LENGTH(0);
2121
2122 skb = alloc_skb(len, GFP_ATOMIC);
2123 if (skb == NULL)
2124 return -ENOMEM;
2125 b = skb->tail;
2126
2127
2128 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2129 nlh->nlmsg_flags = 0;
2130
2131 #ifdef CONFIG_XFRM_SUB_POLICY
2132 memset(&upt, 0, sizeof(upt));
2133 upt.type = c->data.type;
2134 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
2135 #endif
2136
2137 nlh->nlmsg_len = skb->tail - b;
2138
2139 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2140 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2141
2142 nlmsg_failure:
2143 #ifdef CONFIG_XFRM_SUB_POLICY
2144 rtattr_failure:
2145 #endif
2146 kfree_skb(skb);
2147 return -1;
2148 }
2149
2150 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2151 {
2152
2153 switch (c->event) {
2154 case XFRM_MSG_NEWPOLICY:
2155 case XFRM_MSG_UPDPOLICY:
2156 case XFRM_MSG_DELPOLICY:
2157 return xfrm_notify_policy(xp, dir, c);
2158 case XFRM_MSG_FLUSHPOLICY:
2159 return xfrm_notify_policy_flush(c);
2160 case XFRM_MSG_POLEXPIRE:
2161 return xfrm_exp_policy_notify(xp, dir, c);
2162 default:
2163 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2164 }
2165
2166 return 0;
2167
2168 }
2169
2170 static int build_report(struct sk_buff *skb, u8 proto,
2171 struct xfrm_selector *sel, xfrm_address_t *addr)
2172 {
2173 struct xfrm_user_report *ur;
2174 struct nlmsghdr *nlh;
2175 unsigned char *b = skb->tail;
2176
2177 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2178 ur = NLMSG_DATA(nlh);
2179 nlh->nlmsg_flags = 0;
2180
2181 ur->proto = proto;
2182 memcpy(&ur->sel, sel, sizeof(ur->sel));
2183
2184 if (addr)
2185 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2186
2187 nlh->nlmsg_len = skb->tail - b;
2188 return skb->len;
2189
2190 nlmsg_failure:
2191 rtattr_failure:
2192 skb_trim(skb, b - skb->data);
2193 return -1;
2194 }
2195
2196 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2197 xfrm_address_t *addr)
2198 {
2199 struct sk_buff *skb;
2200 size_t len;
2201
2202 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2203 skb = alloc_skb(len, GFP_ATOMIC);
2204 if (skb == NULL)
2205 return -ENOMEM;
2206
2207 if (build_report(skb, proto, sel, addr) < 0)
2208 BUG();
2209
2210 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2211 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2212 }
2213
2214 static struct xfrm_mgr netlink_mgr = {
2215 .id = "netlink",
2216 .notify = xfrm_send_state_notify,
2217 .acquire = xfrm_send_acquire,
2218 .compile_policy = xfrm_compile_policy,
2219 .notify_policy = xfrm_send_policy_notify,
2220 .report = xfrm_send_report,
2221 };
2222
2223 static int __init xfrm_user_init(void)
2224 {
2225 struct sock *nlsk;
2226
2227 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2228
2229 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2230 xfrm_netlink_rcv, THIS_MODULE);
2231 if (nlsk == NULL)
2232 return -ENOMEM;
2233 rcu_assign_pointer(xfrm_nl, nlsk);
2234
2235 xfrm_register_km(&netlink_mgr);
2236
2237 return 0;
2238 }
2239
2240 static void __exit xfrm_user_exit(void)
2241 {
2242 struct sock *nlsk = xfrm_nl;
2243
2244 xfrm_unregister_km(&netlink_mgr);
2245 rcu_assign_pointer(xfrm_nl, NULL);
2246 synchronize_rcu();
2247 sock_release(nlsk->sk_socket);
2248 }
2249
2250 module_init(xfrm_user_init);
2251 module_exit(xfrm_user_exit);
2252 MODULE_LICENSE("GPL");
2253 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2254
hh.org GIT migration