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[TCP]: sysctl to allow TCP window > 32767 sans wscale
[net-next-2.6.git] / net / xfrm / xfrm_user.c
CommitLineData
1da177e4
LT		 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
df71837d 10 *
1da177e4
LT		 11 */
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/types.h>
16#include <linux/slab.h>
17#include <linux/socket.h>
18#include <linux/string.h>
19#include <linux/net.h>
20#include <linux/skbuff.h>
1da177e4
LT		 21#include <linux/rtnetlink.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>
88fc2c84 28#include <net/netlink.h>
1da177e4
LT		 29#include <asm/uaccess.h>
30
1da177e4
LT		 31static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
32{
33 struct rtattr *rt = xfrma[type - 1];
34 struct xfrm_algo *algp;
31c26852 35 int len;
1da177e4
LT		 36
37 if (!rt)
38 return 0;
39
31c26852
HX		 40 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
41 if (len < 0)
1da177e4
LT		 42 return -EINVAL;
43
44 algp = RTA_DATA(rt);
31c26852
HX		 45
46 len -= (algp->alg_key_len + 7U) / 8;
47 if (len < 0)
48 return -EINVAL;
49
1da177e4
LT		 50 switch (type) {
51 case XFRMA_ALG_AUTH:
52 if (!algp->alg_key_len &&
53 strcmp(algp->alg_name, "digest_null") != 0)
54 return -EINVAL;
55 break;
56
57 case XFRMA_ALG_CRYPT:
58 if (!algp->alg_key_len &&
59 strcmp(algp->alg_name, "cipher_null") != 0)
60 return -EINVAL;
61 break;
62
63 case XFRMA_ALG_COMP:
64 /* Zero length keys are legal. */
65 break;
66
67 default:
68 return -EINVAL;
69 };
70
71 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
72 return 0;
73}
74
75static int verify_encap_tmpl(struct rtattr **xfrma)
76{
77 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
78 struct xfrm_encap_tmpl *encap;
79
80 if (!rt)
81 return 0;
82
83 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
84 return -EINVAL;
85
86 return 0;
87}
88
df71837d
TJ		 89
90static inline int verify_sec_ctx_len(struct rtattr **xfrma)
91{
92 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
93 struct xfrm_user_sec_ctx *uctx;
94 int len = 0;
95
96 if (!rt)
97 return 0;
98
99 if (rt->rta_len < sizeof(*uctx))
100 return -EINVAL;
101
102 uctx = RTA_DATA(rt);
103
df71837d
TJ		 104 len += sizeof(struct xfrm_user_sec_ctx);
105 len += uctx->ctx_len;
106
107 if (uctx->len != len)
108 return -EINVAL;
109
110 return 0;
111}
112
113
1da177e4
LT		 114static int verify_newsa_info(struct xfrm_usersa_info *p,
115 struct rtattr **xfrma)
116{
117 int err;
118
119 err = -EINVAL;
120 switch (p->family) {
121 case AF_INET:
122 break;
123
124 case AF_INET6:
125#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
126 break;
127#else
128 err = -EAFNOSUPPORT;
129 goto out;
130#endif
131
132 default:
133 goto out;
134 };
135
136 err = -EINVAL;
137 switch (p->id.proto) {
138 case IPPROTO_AH:
139 if (!xfrma[XFRMA_ALG_AUTH-1] ||
140 xfrma[XFRMA_ALG_CRYPT-1] ||
141 xfrma[XFRMA_ALG_COMP-1])
142 goto out;
143 break;
144
145 case IPPROTO_ESP:
146 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
147 !xfrma[XFRMA_ALG_CRYPT-1]) ||
148 xfrma[XFRMA_ALG_COMP-1])
149 goto out;
150 break;
151
152 case IPPROTO_COMP:
153 if (!xfrma[XFRMA_ALG_COMP-1] ||
154 xfrma[XFRMA_ALG_AUTH-1] ||
155 xfrma[XFRMA_ALG_CRYPT-1])
156 goto out;
157 break;
158
159 default:
160 goto out;
161 };
162
163 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
164 goto out;
165 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
166 goto out;
167 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
168 goto out;
169 if ((err = verify_encap_tmpl(xfrma)))
170 goto out;
df71837d
TJ		 171 if ((err = verify_sec_ctx_len(xfrma)))
172 goto out;
1da177e4
LT		 173
174 err = -EINVAL;
175 switch (p->mode) {
176 case 0:
177 case 1:
178 break;
179
180 default:
181 goto out;
182 };
183
184 err = 0;
185
186out:
187 return err;
188}
189
190static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
191 struct xfrm_algo_desc *(*get_byname)(char *, int),
192 struct rtattr *u_arg)
193{
194 struct rtattr *rta = u_arg;
195 struct xfrm_algo *p, *ualg;
196 struct xfrm_algo_desc *algo;
b9e9dead 197 int len;
1da177e4
LT		 198
199 if (!rta)
200 return 0;
201
202 ualg = RTA_DATA(rta);
203
204 algo = get_byname(ualg->alg_name, 1);
205 if (!algo)
206 return -ENOSYS;
207 *props = algo->desc.sadb_alg_id;
208
b9e9dead
HX		 209 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
210 p = kmalloc(len, GFP_KERNEL);
1da177e4
LT		 211 if (!p)
212 return -ENOMEM;
213
b9e9dead 214 memcpy(p, ualg, len);
1da177e4
LT		 215 *algpp = p;
216 return 0;
217}
218
219static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
220{
221 struct rtattr *rta = u_arg;
222 struct xfrm_encap_tmpl *p, *uencap;
223
224 if (!rta)
225 return 0;
226
227 uencap = RTA_DATA(rta);
228 p = kmalloc(sizeof(*p), GFP_KERNEL);
229 if (!p)
230 return -ENOMEM;
231
232 memcpy(p, uencap, sizeof(*p));
233 *encapp = p;
234 return 0;
235}
236
df71837d
TJ		 237
238static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp)
239{
240 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
241 int len = 0;
242
243 if (xfrm_ctx) {
244 len += sizeof(struct xfrm_user_sec_ctx);
245 len += xfrm_ctx->ctx_len;
246 }
247 return len;
248}
249
250static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
251{
252 struct xfrm_user_sec_ctx *uctx;
253
254 if (!u_arg)
255 return 0;
256
257 uctx = RTA_DATA(u_arg);
258 return security_xfrm_state_alloc(x, uctx);
259}
260
1da177e4
LT		 261static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
262{
263 memcpy(&x->id, &p->id, sizeof(x->id));
264 memcpy(&x->sel, &p->sel, sizeof(x->sel));
265 memcpy(&x->lft, &p->lft, sizeof(x->lft));
266 x->props.mode = p->mode;
267 x->props.replay_window = p->replay_window;
268 x->props.reqid = p->reqid;
269 x->props.family = p->family;
270 x->props.saddr = p->saddr;
271 x->props.flags = p->flags;
272}
273
d51d081d
JHS		 274/*
275 * someday when pfkey also has support, we could have the code
276 * somehow made shareable and move it to xfrm_state.c - JHS
277 *
278*/
279static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
280{
281 int err = - EINVAL;
282 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
283 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
284 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
285 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
286
287 if (rp) {
288 struct xfrm_replay_state *replay;
289 if (RTA_PAYLOAD(rp) < sizeof(*replay))
290 goto error;
291 replay = RTA_DATA(rp);
292 memcpy(&x->replay, replay, sizeof(*replay));
293 memcpy(&x->preplay, replay, sizeof(*replay));
294 }
295
296 if (lt) {
297 struct xfrm_lifetime_cur *ltime;
298 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
299 goto error;
300 ltime = RTA_DATA(lt);
301 x->curlft.bytes = ltime->bytes;
302 x->curlft.packets = ltime->packets;
303 x->curlft.add_time = ltime->add_time;
304 x->curlft.use_time = ltime->use_time;
305 }
306
307 if (et) {
308 if (RTA_PAYLOAD(et) < sizeof(u32))
309 goto error;
310 x->replay_maxage = *(u32*)RTA_DATA(et);
311 }
312
313 if (rt) {
314 if (RTA_PAYLOAD(rt) < sizeof(u32))
315 goto error;
316 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
317 }
318
319 return 0;
320error:
321 return err;
322}
323
1da177e4
LT		 324static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
325 struct rtattr **xfrma,
326 int *errp)
327{
328 struct xfrm_state *x = xfrm_state_alloc();
329 int err = -ENOMEM;
330
331 if (!x)
332 goto error_no_put;
333
334 copy_from_user_state(x, p);
335
336 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
337 xfrm_aalg_get_byname,
338 xfrma[XFRMA_ALG_AUTH-1])))
339 goto error;
340 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
341 xfrm_ealg_get_byname,
342 xfrma[XFRMA_ALG_CRYPT-1])))
343 goto error;
344 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
345 xfrm_calg_get_byname,
346 xfrma[XFRMA_ALG_COMP-1])))
347 goto error;
348 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
349 goto error;
350
72cb6962 351 err = xfrm_init_state(x);
1da177e4
LT		 352 if (err)
353 goto error;
354
df71837d
TJ		 355 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
356 goto error;
357
1da177e4 358 x->km.seq = p->seq;
d51d081d
JHS		 359 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
360 /* sysctl_xfrm_aevent_etime is in 100ms units */
361 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
362 x->preplay.bitmap = 0;
363 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
364 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
365
366 /* override default values from above */
367
368 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
369 if (err < 0)
370 goto error;
1da177e4
LT		 371
372 return x;
373
374error:
375 x->km.state = XFRM_STATE_DEAD;
376 xfrm_state_put(x);
377error_no_put:
378 *errp = err;
379 return NULL;
380}
381
382static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
383{
384 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
385 struct xfrm_state *x;
386 int err;
26b15dad 387 struct km_event c;
1da177e4 388
df71837d 389 err = verify_newsa_info(p, (struct rtattr **)xfrma);
1da177e4
LT		 390 if (err)
391 return err;
392
df71837d 393 x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err);
1da177e4
LT		 394 if (!x)
395 return err;
396
26b15dad 397 xfrm_state_hold(x);
1da177e4
LT		 398 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
399 err = xfrm_state_add(x);
400 else
401 err = xfrm_state_update(x);
402
403 if (err < 0) {
404 x->km.state = XFRM_STATE_DEAD;
21380b81 405 __xfrm_state_put(x);
7d6dfe1f 406 goto out;
1da177e4
LT		 407 }
408
26b15dad
JHS		 409 c.seq = nlh->nlmsg_seq;
410 c.pid = nlh->nlmsg_pid;
f60f6b8f 411 c.event = nlh->nlmsg_type;
26b15dad
JHS		 412
413 km_state_notify(x, &c);
7d6dfe1f 414out:
26b15dad 415 xfrm_state_put(x);
1da177e4
LT		 416 return err;
417}
418
419static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
420{
421 struct xfrm_state *x;
26b15dad
JHS		 422 int err;
423 struct km_event c;
1da177e4
LT		 424 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
425
426 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
427 if (x == NULL)
428 return -ESRCH;
429
430 if (xfrm_state_kern(x)) {
431 xfrm_state_put(x);
432 return -EPERM;
433 }
434
26b15dad
JHS		 435 err = xfrm_state_delete(x);
436 if (err < 0) {
437 xfrm_state_put(x);
438 return err;
439 }
440
441 c.seq = nlh->nlmsg_seq;
442 c.pid = nlh->nlmsg_pid;
f60f6b8f 443 c.event = nlh->nlmsg_type;
26b15dad 444 km_state_notify(x, &c);
1da177e4
LT		 445 xfrm_state_put(x);
446
26b15dad 447 return err;
1da177e4
LT		 448}
449
450static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
451{
452 memcpy(&p->id, &x->id, sizeof(p->id));
453 memcpy(&p->sel, &x->sel, sizeof(p->sel));
454 memcpy(&p->lft, &x->lft, sizeof(p->lft));
455 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
456 memcpy(&p->stats, &x->stats, sizeof(p->stats));
457 p->saddr = x->props.saddr;
458 p->mode = x->props.mode;
459 p->replay_window = x->props.replay_window;
460 p->reqid = x->props.reqid;
461 p->family = x->props.family;
462 p->flags = x->props.flags;
463 p->seq = x->km.seq;
464}
465
466struct xfrm_dump_info {
467 struct sk_buff *in_skb;
468 struct sk_buff *out_skb;
469 u32 nlmsg_seq;
470 u16 nlmsg_flags;
471 int start_idx;
472 int this_idx;
473};
474
475static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
476{
477 struct xfrm_dump_info *sp = ptr;
478 struct sk_buff *in_skb = sp->in_skb;
479 struct sk_buff *skb = sp->out_skb;
480 struct xfrm_usersa_info *p;
481 struct nlmsghdr *nlh;
482 unsigned char *b = skb->tail;
483
484 if (sp->this_idx < sp->start_idx)
485 goto out;
486
487 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
488 sp->nlmsg_seq,
489 XFRM_MSG_NEWSA, sizeof(*p));
490 nlh->nlmsg_flags = sp->nlmsg_flags;
491
492 p = NLMSG_DATA(nlh);
493 copy_to_user_state(x, p);
494
495 if (x->aalg)
496 RTA_PUT(skb, XFRMA_ALG_AUTH,
497 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
498 if (x->ealg)
499 RTA_PUT(skb, XFRMA_ALG_CRYPT,
500 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
501 if (x->calg)
502 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
503
504 if (x->encap)
505 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
506
df71837d
TJ		 507 if (x->security) {
508 int ctx_size = sizeof(struct xfrm_sec_ctx) +
509 x->security->ctx_len;
510 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
511 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
512
513 uctx->exttype = XFRMA_SEC_CTX;
514 uctx->len = ctx_size;
515 uctx->ctx_doi = x->security->ctx_doi;
516 uctx->ctx_alg = x->security->ctx_alg;
517 uctx->ctx_len = x->security->ctx_len;
518 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
519 }
1da177e4
LT		 520 nlh->nlmsg_len = skb->tail - b;
521out:
522 sp->this_idx++;
523 return 0;
524
525nlmsg_failure:
526rtattr_failure:
527 skb_trim(skb, b - skb->data);
528 return -1;
529}
530
531static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
532{
533 struct xfrm_dump_info info;
534
535 info.in_skb = cb->skb;
536 info.out_skb = skb;
537 info.nlmsg_seq = cb->nlh->nlmsg_seq;
538 info.nlmsg_flags = NLM_F_MULTI;
539 info.this_idx = 0;
540 info.start_idx = cb->args[0];
541 (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
542 cb->args[0] = info.this_idx;
543
544 return skb->len;
545}
546
547static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
548 struct xfrm_state *x, u32 seq)
549{
550 struct xfrm_dump_info info;
551 struct sk_buff *skb;
552
553 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
554 if (!skb)
555 return ERR_PTR(-ENOMEM);
556
557 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
558 info.in_skb = in_skb;
559 info.out_skb = skb;
560 info.nlmsg_seq = seq;
561 info.nlmsg_flags = 0;
562 info.this_idx = info.start_idx = 0;
563
564 if (dump_one_state(x, 0, &info)) {
565 kfree_skb(skb);
566 return NULL;
567 }
568
569 return skb;
570}
571
572static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
573{
574 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
575 struct xfrm_state *x;
576 struct sk_buff *resp_skb;
577 int err;
578
579 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
580 err = -ESRCH;
581 if (x == NULL)
582 goto out_noput;
583
584 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
585 if (IS_ERR(resp_skb)) {
586 err = PTR_ERR(resp_skb);
587 } else {
588 err = netlink_unicast(xfrm_nl, resp_skb,
589 NETLINK_CB(skb).pid, MSG_DONTWAIT);
590 }
591 xfrm_state_put(x);
592out_noput:
593 return err;
594}
595
596static int verify_userspi_info(struct xfrm_userspi_info *p)
597{
598 switch (p->info.id.proto) {
599 case IPPROTO_AH:
600 case IPPROTO_ESP:
601 break;
602
603 case IPPROTO_COMP:
604 /* IPCOMP spi is 16-bits. */
605 if (p->max >= 0x10000)
606 return -EINVAL;
607 break;
608
609 default:
610 return -EINVAL;
611 };
612
613 if (p->min > p->max)
614 return -EINVAL;
615
616 return 0;
617}
618
619static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
620{
621 struct xfrm_state *x;
622 struct xfrm_userspi_info *p;
623 struct sk_buff *resp_skb;
624 xfrm_address_t *daddr;
625 int family;
626 int err;
627
628 p = NLMSG_DATA(nlh);
629 err = verify_userspi_info(p);
630 if (err)
631 goto out_noput;
632
633 family = p->info.family;
634 daddr = &p->info.id.daddr;
635
636 x = NULL;
637 if (p->info.seq) {
638 x = xfrm_find_acq_byseq(p->info.seq);
639 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
640 xfrm_state_put(x);
641 x = NULL;
642 }
643 }
644
645 if (!x)
646 x = xfrm_find_acq(p->info.mode, p->info.reqid,
647 p->info.id.proto, daddr,
648 &p->info.saddr, 1,
649 family);
650 err = -ENOENT;
651 if (x == NULL)
652 goto out_noput;
653
654 resp_skb = ERR_PTR(-ENOENT);
655
656 spin_lock_bh(&x->lock);
657 if (x->km.state != XFRM_STATE_DEAD) {
658 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
659 if (x->id.spi)
660 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
661 }
662 spin_unlock_bh(&x->lock);
663
664 if (IS_ERR(resp_skb)) {
665 err = PTR_ERR(resp_skb);
666 goto out;
667 }
668
669 err = netlink_unicast(xfrm_nl, resp_skb,
670 NETLINK_CB(skb).pid, MSG_DONTWAIT);
671
672out:
673 xfrm_state_put(x);
674out_noput:
675 return err;
676}
677
678static int verify_policy_dir(__u8 dir)
679{
680 switch (dir) {
681 case XFRM_POLICY_IN:
682 case XFRM_POLICY_OUT:
683 case XFRM_POLICY_FWD:
684 break;
685
686 default:
687 return -EINVAL;
688 };
689
690 return 0;
691}
692
693static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
694{
695 switch (p->share) {
696 case XFRM_SHARE_ANY:
697 case XFRM_SHARE_SESSION:
698 case XFRM_SHARE_USER:
699 case XFRM_SHARE_UNIQUE:
700 break;
701
702 default:
703 return -EINVAL;
704 };
705
706 switch (p->action) {
707 case XFRM_POLICY_ALLOW:
708 case XFRM_POLICY_BLOCK:
709 break;
710
711 default:
712 return -EINVAL;
713 };
714
715 switch (p->sel.family) {
716 case AF_INET:
717 break;
718
719 case AF_INET6:
720#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
721 break;
722#else
723 return -EAFNOSUPPORT;
724#endif
725
726 default:
727 return -EINVAL;
728 };
729
730 return verify_policy_dir(p->dir);
731}
732
df71837d
TJ		 733static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
734{
735 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
736 struct xfrm_user_sec_ctx *uctx;
737
738 if (!rt)
739 return 0;
740
741 uctx = RTA_DATA(rt);
742 return security_xfrm_policy_alloc(pol, uctx);
743}
744
1da177e4
LT		 745static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
746 int nr)
747{
748 int i;
749
750 xp->xfrm_nr = nr;
751 for (i = 0; i < nr; i++, ut++) {
752 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
753
754 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
755 memcpy(&t->saddr, &ut->saddr,
756 sizeof(xfrm_address_t));
757 t->reqid = ut->reqid;
758 t->mode = ut->mode;
759 t->share = ut->share;
760 t->optional = ut->optional;
761 t->aalgos = ut->aalgos;
762 t->ealgos = ut->ealgos;
763 t->calgos = ut->calgos;
764 }
765}
766
767static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
768{
769 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
770 struct xfrm_user_tmpl *utmpl;
771 int nr;
772
773 if (!rt) {
774 pol->xfrm_nr = 0;
775 } else {
776 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
777
778 if (nr > XFRM_MAX_DEPTH)
779 return -EINVAL;
780
781 copy_templates(pol, RTA_DATA(rt), nr);
782 }
783 return 0;
784}
785
786static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
787{
788 xp->priority = p->priority;
789 xp->index = p->index;
790 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
791 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
792 xp->action = p->action;
793 xp->flags = p->flags;
794 xp->family = p->sel.family;
795 /* XXX xp->share = p->share; */
796}
797
798static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
799{
800 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
801 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
802 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
803 p->priority = xp->priority;
804 p->index = xp->index;
805 p->sel.family = xp->family;
806 p->dir = dir;
807 p->action = xp->action;
808 p->flags = xp->flags;
809 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
810}
811
812static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
813{
814 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
815 int err;
816
817 if (!xp) {
818 *errp = -ENOMEM;
819 return NULL;
820 }
821
822 copy_from_user_policy(xp, p);
df71837d
TJ		 823
824 if (!(err = copy_from_user_tmpl(xp, xfrma)))
825 err = copy_from_user_sec_ctx(xp, xfrma);
826
1da177e4
LT		 827 if (err) {
828 *errp = err;
829 kfree(xp);
830 xp = NULL;
831 }
832
833 return xp;
834}
835
836static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
837{
838 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
839 struct xfrm_policy *xp;
26b15dad 840 struct km_event c;
1da177e4
LT		 841 int err;
842 int excl;
843
844 err = verify_newpolicy_info(p);
df71837d
TJ		 845 if (err)
846 return err;
847 err = verify_sec_ctx_len((struct rtattr **)xfrma);
1da177e4
LT		 848 if (err)
849 return err;
850
df71837d 851 xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err);
1da177e4
LT		 852 if (!xp)
853 return err;
854
26b15dad
JHS		 855 /* shouldnt excl be based on nlh flags??
856 * Aha! this is anti-netlink really i.e more pfkey derived
857 * in netlink excl is a flag and you wouldnt need
858 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 859 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
860 err = xfrm_policy_insert(p->dir, xp, excl);
861 if (err) {
5f8ac64b 862 security_xfrm_policy_free(xp);
1da177e4
LT		 863 kfree(xp);
864 return err;
865 }
866
f60f6b8f 867 c.event = nlh->nlmsg_type;
26b15dad
JHS		 868 c.seq = nlh->nlmsg_seq;
869 c.pid = nlh->nlmsg_pid;
870 km_policy_notify(xp, p->dir, &c);
871
1da177e4
LT		 872 xfrm_pol_put(xp);
873
874 return 0;
875}
876
877static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
878{
879 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
880 int i;
881
882 if (xp->xfrm_nr == 0)
883 return 0;
884
885 for (i = 0; i < xp->xfrm_nr; i++) {
886 struct xfrm_user_tmpl *up = &vec[i];
887 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
888
889 memcpy(&up->id, &kp->id, sizeof(up->id));
890 up->family = xp->family;
891 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
892 up->reqid = kp->reqid;
893 up->mode = kp->mode;
894 up->share = kp->share;
895 up->optional = kp->optional;
896 up->aalgos = kp->aalgos;
897 up->ealgos = kp->ealgos;
898 up->calgos = kp->calgos;
899 }
900 RTA_PUT(skb, XFRMA_TMPL,
901 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
902 vec);
903
904 return 0;
905
906rtattr_failure:
907 return -1;
908}
909
df71837d
TJ		 910static int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
911{
912 if (xp->security) {
913 int ctx_size = sizeof(struct xfrm_sec_ctx) +
914 xp->security->ctx_len;
915 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
916 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
917
918 uctx->exttype = XFRMA_SEC_CTX;
919 uctx->len = ctx_size;
920 uctx->ctx_doi = xp->security->ctx_doi;
921 uctx->ctx_alg = xp->security->ctx_alg;
922 uctx->ctx_len = xp->security->ctx_len;
923 memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len);
924 }
925 return 0;
926
927 rtattr_failure:
928 return -1;
929}
930
1da177e4
LT		 931static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
932{
933 struct xfrm_dump_info *sp = ptr;
934 struct xfrm_userpolicy_info *p;
935 struct sk_buff *in_skb = sp->in_skb;
936 struct sk_buff *skb = sp->out_skb;
937 struct nlmsghdr *nlh;
938 unsigned char *b = skb->tail;
939
940 if (sp->this_idx < sp->start_idx)
941 goto out;
942
943 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
944 sp->nlmsg_seq,
945 XFRM_MSG_NEWPOLICY, sizeof(*p));
946 p = NLMSG_DATA(nlh);
947 nlh->nlmsg_flags = sp->nlmsg_flags;
948
949 copy_to_user_policy(xp, p, dir);
950 if (copy_to_user_tmpl(xp, skb) < 0)
951 goto nlmsg_failure;
df71837d
TJ		 952 if (copy_to_user_sec_ctx(xp, skb))
953 goto nlmsg_failure;
1da177e4
LT		 954
955 nlh->nlmsg_len = skb->tail - b;
956out:
957 sp->this_idx++;
958 return 0;
959
960nlmsg_failure:
961 skb_trim(skb, b - skb->data);
962 return -1;
963}
964
965static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
966{
967 struct xfrm_dump_info info;
968
969 info.in_skb = cb->skb;
970 info.out_skb = skb;
971 info.nlmsg_seq = cb->nlh->nlmsg_seq;
972 info.nlmsg_flags = NLM_F_MULTI;
973 info.this_idx = 0;
974 info.start_idx = cb->args[0];
975 (void) xfrm_policy_walk(dump_one_policy, &info);
976 cb->args[0] = info.this_idx;
977
978 return skb->len;
979}
980
981static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
982 struct xfrm_policy *xp,
983 int dir, u32 seq)
984{
985 struct xfrm_dump_info info;
986 struct sk_buff *skb;
987
988 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
989 if (!skb)
990 return ERR_PTR(-ENOMEM);
991
992 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
993 info.in_skb = in_skb;
994 info.out_skb = skb;
995 info.nlmsg_seq = seq;
996 info.nlmsg_flags = 0;
997 info.this_idx = info.start_idx = 0;
998
999 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1000 kfree_skb(skb);
1001 return NULL;
1002 }
1003
1004 return skb;
1005}
1006
1007static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1008{
1009 struct xfrm_policy *xp;
1010 struct xfrm_userpolicy_id *p;
1011 int err;
26b15dad 1012 struct km_event c;
1da177e4
LT		 1013 int delete;
1014
1015 p = NLMSG_DATA(nlh);
1016 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1017
1018 err = verify_policy_dir(p->dir);
1019 if (err)
1020 return err;
1021
1022 if (p->index)
1023 xp = xfrm_policy_byid(p->dir, p->index, delete);
df71837d
TJ		 1024 else {
1025 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1026 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1027 struct xfrm_policy tmp;
1028
1029 err = verify_sec_ctx_len(rtattrs);
1030 if (err)
1031 return err;
1032
1033 memset(&tmp, 0, sizeof(struct xfrm_policy));
1034 if (rt) {
1035 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1036
1037 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1038 return err;
1039 }
1040 xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete);
1041 security_xfrm_policy_free(&tmp);
1042 }
1da177e4
LT		 1043 if (xp == NULL)
1044 return -ENOENT;
1045
1046 if (!delete) {
1047 struct sk_buff *resp_skb;
1048
1049 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1050 if (IS_ERR(resp_skb)) {
1051 err = PTR_ERR(resp_skb);
1052 } else {
1053 err = netlink_unicast(xfrm_nl, resp_skb,
1054 NETLINK_CB(skb).pid,
1055 MSG_DONTWAIT);
1056 }
26b15dad 1057 } else {
e7443892 1058 c.data.byid = p->index;
f60f6b8f 1059 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1060 c.seq = nlh->nlmsg_seq;
1061 c.pid = nlh->nlmsg_pid;
1062 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1063 }
1064
1065 xfrm_pol_put(xp);
1066
1067 return err;
1068}
1069
1070static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1071{
26b15dad 1072 struct km_event c;
1da177e4
LT		 1073 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
1074
1075 xfrm_state_flush(p->proto);
bf08867f 1076 c.data.proto = p->proto;
f60f6b8f 1077 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1078 c.seq = nlh->nlmsg_seq;
1079 c.pid = nlh->nlmsg_pid;
1080 km_state_notify(NULL, &c);
1081
1da177e4
LT		 1082 return 0;
1083}
1084
d51d081d
JHS		 1085
1086static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1087{
1088 struct xfrm_aevent_id *id;
1089 struct nlmsghdr *nlh;
1090 struct xfrm_lifetime_cur ltime;
1091 unsigned char *b = skb->tail;
1092
1093 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1094 id = NLMSG_DATA(nlh);
1095 nlh->nlmsg_flags = 0;
1096
1097 id->sa_id.daddr = x->id.daddr;
1098 id->sa_id.spi = x->id.spi;
1099 id->sa_id.family = x->props.family;
1100 id->sa_id.proto = x->id.proto;
1101 id->flags = c->data.aevent;
1102
1103 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1104
1105 ltime.bytes = x->curlft.bytes;
1106 ltime.packets = x->curlft.packets;
1107 ltime.add_time = x->curlft.add_time;
1108 ltime.use_time = x->curlft.use_time;
1109
1110 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1111
1112 if (id->flags&XFRM_AE_RTHR) {
1113 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1114 }
1115
1116 if (id->flags&XFRM_AE_ETHR) {
1117 u32 etimer = x->replay_maxage*10/HZ;
1118 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1119 }
1120
1121 nlh->nlmsg_len = skb->tail - b;
1122 return skb->len;
1123
1124rtattr_failure:
1125nlmsg_failure:
1126 skb_trim(skb, b - skb->data);
1127 return -1;
1128}
1129
1130static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1131{
1132 struct xfrm_state *x;
1133 struct sk_buff *r_skb;
1134 int err;
1135 struct km_event c;
1136 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1137 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1138 struct xfrm_usersa_id *id = &p->sa_id;
1139
1140 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1141 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1142
1143 if (p->flags&XFRM_AE_RTHR)
1144 len+=RTA_SPACE(sizeof(u32));
1145
1146 if (p->flags&XFRM_AE_ETHR)
1147 len+=RTA_SPACE(sizeof(u32));
1148
1149 r_skb = alloc_skb(len, GFP_ATOMIC);
1150 if (r_skb == NULL)
1151 return -ENOMEM;
1152
1153 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1154 if (x == NULL) {
1155 kfree(r_skb);
1156 return -ESRCH;
1157 }
1158
1159 /*
1160 * XXX: is this lock really needed - none of the other
1161 * gets lock (the concern is things getting updated
1162 * while we are still reading) - jhs
1163 */
1164 spin_lock_bh(&x->lock);
1165 c.data.aevent = p->flags;
1166 c.seq = nlh->nlmsg_seq;
1167 c.pid = nlh->nlmsg_pid;
1168
1169 if (build_aevent(r_skb, x, &c) < 0)
1170 BUG();
1171 err = netlink_unicast(xfrm_nl, r_skb,
1172 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1173 spin_unlock_bh(&x->lock);
1174 xfrm_state_put(x);
1175 return err;
1176}
1177
1178static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1179{
1180 struct xfrm_state *x;
1181 struct km_event c;
1182 int err = - EINVAL;
1183 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1184 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1185 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1186
1187 if (!lt && !rp)
1188 return err;
1189
1190 /* pedantic mode - thou shalt sayeth replaceth */
1191 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1192 return err;
1193
1194 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1195 if (x == NULL)
1196 return -ESRCH;
1197
1198 if (x->km.state != XFRM_STATE_VALID)
1199 goto out;
1200
1201 spin_lock_bh(&x->lock);
1202 err = xfrm_update_ae_params(x,(struct rtattr **)xfrma);
1203 spin_unlock_bh(&x->lock);
1204 if (err < 0)
1205 goto out;
1206
1207 c.event = nlh->nlmsg_type;
1208 c.seq = nlh->nlmsg_seq;
1209 c.pid = nlh->nlmsg_pid;
1210 c.data.aevent = XFRM_AE_CU;
1211 km_state_notify(x, &c);
1212 err = 0;
1213out:
1214 xfrm_state_put(x);
1215 return err;
1216}
1217
1da177e4
LT		 1218static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1219{
6c5c8ca7 1220struct km_event c;
26b15dad 1221
1da177e4 1222 xfrm_policy_flush();
f60f6b8f 1223 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1224 c.seq = nlh->nlmsg_seq;
1225 c.pid = nlh->nlmsg_pid;
1226 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1227 return 0;
1228}
1229
6c5c8ca7
JHS		 1230static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1231{
1232 struct xfrm_policy *xp;
1233 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1234 struct xfrm_userpolicy_info *p = &up->pol;
1235 int err = -ENOENT;
1236
1237 if (p->index)
1238 xp = xfrm_policy_byid(p->dir, p->index, 0);
1239 else {
1240 struct rtattr **rtattrs = (struct rtattr **)xfrma;
1241 struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
1242 struct xfrm_policy tmp;
1243
1244 err = verify_sec_ctx_len(rtattrs);
1245 if (err)
1246 return err;
1247
1248 memset(&tmp, 0, sizeof(struct xfrm_policy));
1249 if (rt) {
1250 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1251
1252 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1253 return err;
1254 }
1255 xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0);
1256 security_xfrm_policy_free(&tmp);
1257 }
1258
1259 if (xp == NULL)
1260 return err;
1261 read_lock(&xp->lock);
1262 if (xp->dead) {
1263 read_unlock(&xp->lock);
1264 goto out;
1265 }
1266
1267 read_unlock(&xp->lock);
1268 err = 0;
1269 if (up->hard) {
1270 xfrm_policy_delete(xp, p->dir);
1271 } else {
1272 // reset the timers here?
1273 printk("Dont know what to do with soft policy expire\n");
1274 }
1275 km_policy_expired(xp, p->dir, up->hard, current->pid);
1276
1277out:
1278 xfrm_pol_put(xp);
1279 return err;
1280}
1281
53bc6b4d
JHS		 1282static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1283{
1284 struct xfrm_state *x;
1285 int err;
1286 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1287 struct xfrm_usersa_info *p = &ue->state;
1288
1289 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1290 err = -ENOENT;
1291
1292 if (x == NULL)
1293 return err;
1294
1295 err = -EINVAL;
1296
1297 spin_lock_bh(&x->lock);
1298 if (x->km.state != XFRM_STATE_VALID)
1299 goto out;
1300 km_state_expired(x, ue->hard, current->pid);
1301
1302 if (ue->hard)
1303 __xfrm_state_delete(x);
1304out:
1305 spin_unlock_bh(&x->lock);
1306 xfrm_state_put(x);
1307 return err;
1308}
1309
980ebd25
JHS		 1310static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
1311{
1312 struct xfrm_policy *xp;
1313 struct xfrm_user_tmpl *ut;
1314 int i;
1315 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1316
1317 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1318 struct xfrm_state *x = xfrm_state_alloc();
1319 int err = -ENOMEM;
1320
1321 if (!x)
1322 return err;
1323
1324 err = verify_newpolicy_info(&ua->policy);
1325 if (err) {
1326 printk("BAD policy passed\n");
1327 kfree(x);
1328 return err;
1329 }
1330
1331 /* build an XP */
1332 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err); if (!xp) {
1333 kfree(x);
1334 return err;
1335 }
1336
1337 memcpy(&x->id, &ua->id, sizeof(ua->id));
1338 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1339 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1340
1341 ut = RTA_DATA(rt);
1342 /* extract the templates and for each call km_key */
1343 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1344 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1345 memcpy(&x->id, &t->id, sizeof(x->id));
1346 x->props.mode = t->mode;
1347 x->props.reqid = t->reqid;
1348 x->props.family = ut->family;
1349 t->aalgos = ua->aalgos;
1350 t->ealgos = ua->ealgos;
1351 t->calgos = ua->calgos;
1352 err = km_query(x, t, xp);
1353
1354 }
1355
1356 kfree(x);
1357 kfree(xp);
1358
1359 return 0;
1360}
1361
d51d081d 1362
492b558b
TG		 1363#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1364
1365static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1366 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1367 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1368 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1369 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1370 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1371 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1372 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 1373 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 1374 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b
TG		 1375 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1376 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 1377 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b
TG		 1378 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1379 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
d51d081d
JHS		 1380 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1381 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1da177e4
LT		 1382};
1383
492b558b
TG		 1384#undef XMSGSIZE
1385
1da177e4
LT		 1386static struct xfrm_link {
1387 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
1388 int (*dump)(struct sk_buff *, struct netlink_callback *);
492b558b
TG		 1389} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1390 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1391 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1392 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1393 .dump = xfrm_dump_sa },
1394 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1395 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1396 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1397 .dump = xfrm_dump_policy },
1398 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 1399 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 1400 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 1401 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1402 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 1403 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 1404 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1405 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 1406 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1407 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1da177e4
LT		 1408};
1409
1da177e4
LT		 1410static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
1411{
1412 struct rtattr *xfrma[XFRMA_MAX];
1413 struct xfrm_link *link;
1414 int type, min_len;
1415
1416 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
1417 return 0;
1418
1419 type = nlh->nlmsg_type;
1420
1421 /* A control message: ignore them */
1422 if (type < XFRM_MSG_BASE)
1423 return 0;
1424
1425 /* Unknown message: reply with EINVAL */
1426 if (type > XFRM_MSG_MAX)
1427 goto err_einval;
1428
1429 type -= XFRM_MSG_BASE;
1430 link = &xfrm_dispatch[type];
1431
1432 /* All operations require privileges, even GET */
1433 if (security_netlink_recv(skb)) {
1434 *errp = -EPERM;
1435 return -1;
1436 }
1437
492b558b
TG		 1438 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1439 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1440 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4
LT		 1441 if (link->dump == NULL)
1442 goto err_einval;
1443
1444 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
a8f74b22 1445 link->dump, NULL)) != 0) {
1da177e4
LT		 1446 return -1;
1447 }
88fc2c84
TG		 1448
1449 netlink_queue_skip(nlh, skb);
1da177e4
LT		 1450 return -1;
1451 }
1452
1453 memset(xfrma, 0, sizeof(xfrma));
1454
1455 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1456 goto err_einval;
1457
1458 if (nlh->nlmsg_len > min_len) {
1459 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1460 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1461
1462 while (RTA_OK(attr, attrlen)) {
1463 unsigned short flavor = attr->rta_type;
1464 if (flavor) {
1465 if (flavor > XFRMA_MAX)
1466 goto err_einval;
1467 xfrma[flavor - 1] = attr;
1468 }
1469 attr = RTA_NEXT(attr, attrlen);
1470 }
1471 }
1472
1473 if (link->doit == NULL)
1474 goto err_einval;
1475 *errp = link->doit(skb, nlh, (void **) &xfrma);
1476
1477 return *errp;
1478
1479err_einval:
1480 *errp = -EINVAL;
1481 return -1;
1482}
1483
1da177e4
LT		 1484static void xfrm_netlink_rcv(struct sock *sk, int len)
1485{
88fc2c84 1486 unsigned int qlen = 0;
2a0a6ebe 1487
1da177e4 1488 do {
4a3e2f71 1489 mutex_lock(&xfrm_cfg_mutex);
88fc2c84 1490 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
4a3e2f71 1491 mutex_unlock(&xfrm_cfg_mutex);
1da177e4 1492
2a0a6ebe 1493 } while (qlen);
1da177e4
LT		 1494}
1495
d51d081d 1496static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 1497{
1498 struct xfrm_user_expire *ue;
1499 struct nlmsghdr *nlh;
1500 unsigned char *b = skb->tail;
1501
d51d081d 1502 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1da177e4
LT		 1503 sizeof(*ue));
1504 ue = NLMSG_DATA(nlh);
1505 nlh->nlmsg_flags = 0;
1506
1507 copy_to_user_state(x, &ue->state);
d51d081d 1508 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4
LT		 1509
1510 nlh->nlmsg_len = skb->tail - b;
1511 return skb->len;
1512
1513nlmsg_failure:
1514 skb_trim(skb, b - skb->data);
1515 return -1;
1516}
1517
26b15dad 1518static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 1519{
1520 struct sk_buff *skb;
ee57eef9 1521 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1da177e4 1522
ee57eef9 1523 skb = alloc_skb(len, GFP_ATOMIC);
1da177e4
LT		 1524 if (skb == NULL)
1525 return -ENOMEM;
1526
d51d081d 1527 if (build_expire(skb, x, c) < 0)
1da177e4
LT		 1528 BUG();
1529
ac6d439d
PM		 1530 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1531 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 1532}
1533
d51d081d
JHS		 1534static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1535{
1536 struct sk_buff *skb;
1537 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1538
1539 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1540 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1541 skb = alloc_skb(len, GFP_ATOMIC);
1542 if (skb == NULL)
1543 return -ENOMEM;
1544
1545 if (build_aevent(skb, x, c) < 0)
1546 BUG();
1547
1548 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
1549 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1550}
1551
26b15dad
JHS		 1552static int xfrm_notify_sa_flush(struct km_event *c)
1553{
1554 struct xfrm_usersa_flush *p;
1555 struct nlmsghdr *nlh;
1556 struct sk_buff *skb;
1557 unsigned char *b;
1558 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1559
1560 skb = alloc_skb(len, GFP_ATOMIC);
1561 if (skb == NULL)
1562 return -ENOMEM;
1563 b = skb->tail;
1564
1565 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1566 XFRM_MSG_FLUSHSA, sizeof(*p));
1567 nlh->nlmsg_flags = 0;
1568
1569 p = NLMSG_DATA(nlh);
bf08867f 1570 p->proto = c->data.proto;
26b15dad
JHS		 1571
1572 nlh->nlmsg_len = skb->tail - b;
1573
ac6d439d
PM		 1574 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1575 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 1576
1577nlmsg_failure:
1578 kfree_skb(skb);
1579 return -1;
1580}
1581
1582static int inline xfrm_sa_len(struct xfrm_state *x)
1583{
0603eac0 1584 int l = 0;
26b15dad
JHS		 1585 if (x->aalg)
1586 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1587 if (x->ealg)
1588 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1589 if (x->calg)
1590 l += RTA_SPACE(sizeof(*x->calg));
1591 if (x->encap)
1592 l += RTA_SPACE(sizeof(*x->encap));
1593
1594 return l;
1595}
1596
1597static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1598{
1599 struct xfrm_usersa_info *p;
0603eac0 1600 struct xfrm_usersa_id *id;
26b15dad
JHS		 1601 struct nlmsghdr *nlh;
1602 struct sk_buff *skb;
26b15dad
JHS		 1603 unsigned char *b;
1604 int len = xfrm_sa_len(x);
0603eac0
HX		 1605 int headlen;
1606
1607 headlen = sizeof(*p);
1608 if (c->event == XFRM_MSG_DELSA) {
1609 len += RTA_SPACE(headlen);
1610 headlen = sizeof(*id);
1611 }
1612 len += NLMSG_SPACE(headlen);
26b15dad
JHS		 1613
1614 skb = alloc_skb(len, GFP_ATOMIC);
1615 if (skb == NULL)
1616 return -ENOMEM;
1617 b = skb->tail;
1618
0603eac0 1619 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
26b15dad
JHS		 1620 nlh->nlmsg_flags = 0;
1621
1622 p = NLMSG_DATA(nlh);
0603eac0
HX		 1623 if (c->event == XFRM_MSG_DELSA) {
1624 id = NLMSG_DATA(nlh);
1625 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1626 id->spi = x->id.spi;
1627 id->family = x->props.family;
1628 id->proto = x->id.proto;
1629
1630 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1631 }
1632
26b15dad
JHS		 1633 copy_to_user_state(x, p);
1634
1635 if (x->aalg)
1636 RTA_PUT(skb, XFRMA_ALG_AUTH,
1637 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1638 if (x->ealg)
1639 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1640 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1641 if (x->calg)
1642 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1643
1644 if (x->encap)
1645 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1646
1647 nlh->nlmsg_len = skb->tail - b;
1648
ac6d439d
PM		 1649 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1650 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 1651
1652nlmsg_failure:
1653rtattr_failure:
1654 kfree_skb(skb);
1655 return -1;
1656}
1657
1658static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1659{
1660
1661 switch (c->event) {
f60f6b8f 1662 case XFRM_MSG_EXPIRE:
26b15dad 1663 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 1664 case XFRM_MSG_NEWAE:
1665 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 1666 case XFRM_MSG_DELSA:
1667 case XFRM_MSG_UPDSA:
1668 case XFRM_MSG_NEWSA:
26b15dad 1669 return xfrm_notify_sa(x, c);
f60f6b8f 1670 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 1671 return xfrm_notify_sa_flush(c);
1672 default:
1673 printk("xfrm_user: Unknown SA event %d\n", c->event);
1674 break;
1675 }
1676
1677 return 0;
1678
1679}
1680
1da177e4
LT		 1681static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1682 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1683 int dir)
1684{
1685 struct xfrm_user_acquire *ua;
1686 struct nlmsghdr *nlh;
1687 unsigned char *b = skb->tail;
1688 __u32 seq = xfrm_get_acqseq();
1689
1690 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1691 sizeof(*ua));
1692 ua = NLMSG_DATA(nlh);
1693 nlh->nlmsg_flags = 0;
1694
1695 memcpy(&ua->id, &x->id, sizeof(ua->id));
1696 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1697 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1698 copy_to_user_policy(xp, &ua->policy, dir);
1699 ua->aalgos = xt->aalgos;
1700 ua->ealgos = xt->ealgos;
1701 ua->calgos = xt->calgos;
1702 ua->seq = x->km.seq = seq;
1703
1704 if (copy_to_user_tmpl(xp, skb) < 0)
1705 goto nlmsg_failure;
df71837d
TJ		 1706 if (copy_to_user_sec_ctx(xp, skb))
1707 goto nlmsg_failure;
1da177e4
LT		 1708
1709 nlh->nlmsg_len = skb->tail - b;
1710 return skb->len;
1711
1712nlmsg_failure:
1713 skb_trim(skb, b - skb->data);
1714 return -1;
1715}
1716
1717static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1718 struct xfrm_policy *xp, int dir)
1719{
1720 struct sk_buff *skb;
1721 size_t len;
1722
1723 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1724 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
df71837d 1725 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
1da177e4
LT		 1726 skb = alloc_skb(len, GFP_ATOMIC);
1727 if (skb == NULL)
1728 return -ENOMEM;
1729
1730 if (build_acquire(skb, x, xt, xp, dir) < 0)
1731 BUG();
1732
ac6d439d
PM		 1733 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
1734 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 1735}
1736
1737/* User gives us xfrm_user_policy_info followed by an array of 0
1738 * or more templates.
1739 */
1740static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1741 u8 *data, int len, int *dir)
1742{
1743 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1744 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1745 struct xfrm_policy *xp;
1746 int nr;
1747
1748 switch (family) {
1749 case AF_INET:
1750 if (opt != IP_XFRM_POLICY) {
1751 *dir = -EOPNOTSUPP;
1752 return NULL;
1753 }
1754 break;
1755#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1756 case AF_INET6:
1757 if (opt != IPV6_XFRM_POLICY) {
1758 *dir = -EOPNOTSUPP;
1759 return NULL;
1760 }
1761 break;
1762#endif
1763 default:
1764 *dir = -EINVAL;
1765 return NULL;
1766 }
1767
1768 *dir = -EINVAL;
1769
1770 if (len < sizeof(*p) ||
1771 verify_newpolicy_info(p))
1772 return NULL;
1773
1774 nr = ((len - sizeof(*p)) / sizeof(*ut));
1775 if (nr > XFRM_MAX_DEPTH)
1776 return NULL;
1777
a4f1bac6
HX		 1778 if (p->dir > XFRM_POLICY_OUT)
1779 return NULL;
1780
1da177e4
LT		 1781 xp = xfrm_policy_alloc(GFP_KERNEL);
1782 if (xp == NULL) {
1783 *dir = -ENOBUFS;
1784 return NULL;
1785 }
1786
1787 copy_from_user_policy(xp, p);
1788 copy_templates(xp, ut, nr);
1789
1790 *dir = p->dir;
1791
1792 return xp;
1793}
1794
1795static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
d51d081d 1796 int dir, struct km_event *c)
1da177e4
LT		 1797{
1798 struct xfrm_user_polexpire *upe;
1799 struct nlmsghdr *nlh;
d51d081d 1800 int hard = c->data.hard;
1da177e4
LT		 1801 unsigned char *b = skb->tail;
1802
d51d081d 1803 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1da177e4
LT		 1804 upe = NLMSG_DATA(nlh);
1805 nlh->nlmsg_flags = 0;
1806
1807 copy_to_user_policy(xp, &upe->pol, dir);
1808 if (copy_to_user_tmpl(xp, skb) < 0)
1809 goto nlmsg_failure;
df71837d
TJ		 1810 if (copy_to_user_sec_ctx(xp, skb))
1811 goto nlmsg_failure;
1da177e4
LT		 1812 upe->hard = !!hard;
1813
1814 nlh->nlmsg_len = skb->tail - b;
1815 return skb->len;
1816
1817nlmsg_failure:
1818 skb_trim(skb, b - skb->data);
1819 return -1;
1820}
1821
26b15dad 1822static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1da177e4
LT		 1823{
1824 struct sk_buff *skb;
1825 size_t len;
1826
1827 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1828 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
df71837d 1829 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
1da177e4
LT		 1830 skb = alloc_skb(len, GFP_ATOMIC);
1831 if (skb == NULL)
1832 return -ENOMEM;
1833
d51d081d 1834 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 1835 BUG();
1836
ac6d439d
PM		 1837 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1838 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 1839}
1840
26b15dad
JHS		 1841static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1842{
1843 struct xfrm_userpolicy_info *p;
0603eac0 1844 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 1845 struct nlmsghdr *nlh;
1846 struct sk_buff *skb;
26b15dad
JHS		 1847 unsigned char *b;
1848 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
0603eac0
HX		 1849 int headlen;
1850
1851 headlen = sizeof(*p);
1852 if (c->event == XFRM_MSG_DELPOLICY) {
1853 len += RTA_SPACE(headlen);
1854 headlen = sizeof(*id);
1855 }
1856 len += NLMSG_SPACE(headlen);
26b15dad
JHS		 1857
1858 skb = alloc_skb(len, GFP_ATOMIC);
1859 if (skb == NULL)
1860 return -ENOMEM;
1861 b = skb->tail;
1862
0603eac0 1863 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
26b15dad
JHS		 1864
1865 p = NLMSG_DATA(nlh);
0603eac0
HX		 1866 if (c->event == XFRM_MSG_DELPOLICY) {
1867 id = NLMSG_DATA(nlh);
1868 memset(id, 0, sizeof(*id));
1869 id->dir = dir;
1870 if (c->data.byid)
1871 id->index = xp->index;
1872 else
1873 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
1874
1875 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
1876 }
26b15dad
JHS		 1877
1878 nlh->nlmsg_flags = 0;
1879
1880 copy_to_user_policy(xp, p, dir);
1881 if (copy_to_user_tmpl(xp, skb) < 0)
1882 goto nlmsg_failure;
1883
1884 nlh->nlmsg_len = skb->tail - b;
1885
ac6d439d
PM		 1886 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
1887 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 1888
1889nlmsg_failure:
0603eac0 1890rtattr_failure:
26b15dad
JHS		 1891 kfree_skb(skb);
1892 return -1;
1893}
1894
1895static int xfrm_notify_policy_flush(struct km_event *c)
1896{
1897 struct nlmsghdr *nlh;
1898 struct sk_buff *skb;
1899 unsigned char *b;
1900 int len = NLMSG_LENGTH(0);
1901
1902 skb = alloc_skb(len, GFP_ATOMIC);
1903 if (skb == NULL)
1904 return -ENOMEM;
1905 b = skb->tail;
1906
1907
1908 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
1909
1910 nlh->nlmsg_len = skb->tail - b;
1911
ac6d439d
PM		 1912 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
1913 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 1914
1915nlmsg_failure:
1916 kfree_skb(skb);
1917 return -1;
1918}
1919
1920static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1921{
1922
1923 switch (c->event) {
f60f6b8f
HX		 1924 case XFRM_MSG_NEWPOLICY:
1925 case XFRM_MSG_UPDPOLICY:
1926 case XFRM_MSG_DELPOLICY:
26b15dad 1927 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 1928 case XFRM_MSG_FLUSHPOLICY:
26b15dad 1929 return xfrm_notify_policy_flush(c);
f60f6b8f 1930 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 1931 return xfrm_exp_policy_notify(xp, dir, c);
1932 default:
1933 printk("xfrm_user: Unknown Policy event %d\n", c->event);
1934 }
1935
1936 return 0;
1937
1938}
1939
1da177e4
LT		 1940static struct xfrm_mgr netlink_mgr = {
1941 .id = "netlink",
1942 .notify = xfrm_send_state_notify,
1943 .acquire = xfrm_send_acquire,
1944 .compile_policy = xfrm_compile_policy,
1945 .notify_policy = xfrm_send_policy_notify,
1946};
1947
1948static int __init xfrm_user_init(void)
1949{
1950 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1951
06628607
PM		 1952 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
1953 xfrm_netlink_rcv, THIS_MODULE);
1da177e4
LT		 1954 if (xfrm_nl == NULL)
1955 return -ENOMEM;
1956
1957 xfrm_register_km(&netlink_mgr);
1958
1959 return 0;
1960}
1961
1962static void __exit xfrm_user_exit(void)
1963{
1964 xfrm_unregister_km(&netlink_mgr);
1965 sock_release(xfrm_nl->sk_socket);
1966}
1967
1968module_init(xfrm_user_init);
1969module_exit(xfrm_user_exit);
1970MODULE_LICENSE("GPL");
4fdb3bb7 1971MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 1972
Clone of davem's net-next-2.6 tree