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[IPV6]: Track device renames in snmp6.
[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
9409f38a 13#include <linux/crypto.h>
1da177e4
LT		 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>
1da177e4
LT		 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>
88fc2c84 29#include <net/netlink.h>
1da177e4 30#include <asm/uaccess.h>
e23c7194
MN		 31#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
32#include <linux/in6.h>
33#endif
161a09e7 34#include <linux/audit.h>
1da177e4 35
1da177e4
LT		 36static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
37{
38 struct rtattr *rt = xfrma[type - 1];
39 struct xfrm_algo *algp;
31c26852 40 int len;
1da177e4
LT		 41
42 if (!rt)
43 return 0;
44
31c26852
HX		 45 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
46 if (len < 0)
1da177e4
LT		 47 return -EINVAL;
48
49 algp = RTA_DATA(rt);
31c26852 50
a716c119 51 len -= (algp->alg_key_len + 7U) / 8;
31c26852
HX		 52 if (len < 0)
53 return -EINVAL;
54
1da177e4
LT		 55 switch (type) {
56 case XFRMA_ALG_AUTH:
57 if (!algp->alg_key_len &&
58 strcmp(algp->alg_name, "digest_null") != 0)
59 return -EINVAL;
60 break;
61
62 case XFRMA_ALG_CRYPT:
63 if (!algp->alg_key_len &&
64 strcmp(algp->alg_name, "cipher_null") != 0)
65 return -EINVAL;
66 break;
67
68 case XFRMA_ALG_COMP:
69 /* Zero length keys are legal. */
70 break;
71
72 default:
73 return -EINVAL;
3ff50b79 74 }
1da177e4
LT		 75
76 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
77 return 0;
78}
79
80static int verify_encap_tmpl(struct rtattr **xfrma)
81{
82 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
83 struct xfrm_encap_tmpl *encap;
84
85 if (!rt)
86 return 0;
87
88 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
89 return -EINVAL;
90
91 return 0;
92}
93
eb2971b6
MN		 94static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
95 xfrm_address_t **addrp)
96{
97 struct rtattr *rt = xfrma[type - 1];
98
99 if (!rt)
100 return 0;
101
102 if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
103 return -EINVAL;
104
105 if (addrp)
106 *addrp = RTA_DATA(rt);
107
108 return 0;
109}
df71837d
TJ		 110
111static inline int verify_sec_ctx_len(struct rtattr **xfrma)
112{
113 struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
114 struct xfrm_user_sec_ctx *uctx;
115 int len = 0;
116
117 if (!rt)
118 return 0;
119
120 if (rt->rta_len < sizeof(*uctx))
121 return -EINVAL;
122
123 uctx = RTA_DATA(rt);
124
df71837d
TJ		 125 len += sizeof(struct xfrm_user_sec_ctx);
126 len += uctx->ctx_len;
127
128 if (uctx->len != len)
129 return -EINVAL;
130
131 return 0;
132}
133
134
1da177e4
LT		 135static int verify_newsa_info(struct xfrm_usersa_info *p,
136 struct rtattr **xfrma)
137{
138 int err;
139
140 err = -EINVAL;
141 switch (p->family) {
142 case AF_INET:
143 break;
144
145 case AF_INET6:
146#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
147 break;
148#else
149 err = -EAFNOSUPPORT;
150 goto out;
151#endif
152
153 default:
154 goto out;
3ff50b79 155 }
1da177e4
LT		 156
157 err = -EINVAL;
158 switch (p->id.proto) {
159 case IPPROTO_AH:
160 if (!xfrma[XFRMA_ALG_AUTH-1] ||
161 xfrma[XFRMA_ALG_CRYPT-1] ||
162 xfrma[XFRMA_ALG_COMP-1])
163 goto out;
164 break;
165
166 case IPPROTO_ESP:
167 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
168 !xfrma[XFRMA_ALG_CRYPT-1]) ||
169 xfrma[XFRMA_ALG_COMP-1])
170 goto out;
171 break;
172
173 case IPPROTO_COMP:
174 if (!xfrma[XFRMA_ALG_COMP-1] ||
175 xfrma[XFRMA_ALG_AUTH-1] ||
176 xfrma[XFRMA_ALG_CRYPT-1])
177 goto out;
178 break;
179
e23c7194
MN		 180#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
181 case IPPROTO_DSTOPTS:
182 case IPPROTO_ROUTING:
183 if (xfrma[XFRMA_ALG_COMP-1] ||
184 xfrma[XFRMA_ALG_AUTH-1] ||
185 xfrma[XFRMA_ALG_CRYPT-1] ||
186 xfrma[XFRMA_ENCAP-1] ||
187 xfrma[XFRMA_SEC_CTX-1] ||
188 !xfrma[XFRMA_COADDR-1])
189 goto out;
190 break;
191#endif
192
1da177e4
LT		 193 default:
194 goto out;
3ff50b79 195 }
1da177e4
LT		 196
197 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
198 goto out;
199 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
200 goto out;
201 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
202 goto out;
203 if ((err = verify_encap_tmpl(xfrma)))
204 goto out;
df71837d
TJ		 205 if ((err = verify_sec_ctx_len(xfrma)))
206 goto out;
060f02a3
NT		 207 if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
208 goto out;
1da177e4
LT		 209
210 err = -EINVAL;
211 switch (p->mode) {
7e49e6de
MN		 212 case XFRM_MODE_TRANSPORT:
213 case XFRM_MODE_TUNNEL:
060f02a3 214 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 215 case XFRM_MODE_BEET:
1da177e4
LT		 216 break;
217
218 default:
219 goto out;
3ff50b79 220 }
1da177e4
LT		 221
222 err = 0;
223
224out:
225 return err;
226}
227
228static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
229 struct xfrm_algo_desc *(*get_byname)(char *, int),
230 struct rtattr *u_arg)
231{
232 struct rtattr *rta = u_arg;
233 struct xfrm_algo *p, *ualg;
234 struct xfrm_algo_desc *algo;
b9e9dead 235 int len;
1da177e4
LT		 236
237 if (!rta)
238 return 0;
239
240 ualg = RTA_DATA(rta);
241
242 algo = get_byname(ualg->alg_name, 1);
243 if (!algo)
244 return -ENOSYS;
245 *props = algo->desc.sadb_alg_id;
246
b9e9dead 247 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
cdbc6dae 248 p = kmemdup(ualg, len, GFP_KERNEL);
1da177e4
LT		 249 if (!p)
250 return -ENOMEM;
251
04ff1260 252 strcpy(p->alg_name, algo->name);
1da177e4
LT		 253 *algpp = p;
254 return 0;
255}
256
257static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
258{
259 struct rtattr *rta = u_arg;
260 struct xfrm_encap_tmpl *p, *uencap;
261
262 if (!rta)
263 return 0;
264
265 uencap = RTA_DATA(rta);
cdbc6dae 266 p = kmemdup(uencap, sizeof(*p), GFP_KERNEL);
1da177e4
LT		 267 if (!p)
268 return -ENOMEM;
269
1da177e4
LT		 270 *encapp = p;
271 return 0;
272}
273
df71837d 274
661697f7 275static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 276{
df71837d
TJ		 277 int len = 0;
278
279 if (xfrm_ctx) {
280 len += sizeof(struct xfrm_user_sec_ctx);
281 len += xfrm_ctx->ctx_len;
282 }
283 return len;
284}
285
286static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
287{
288 struct xfrm_user_sec_ctx *uctx;
289
290 if (!u_arg)
291 return 0;
292
293 uctx = RTA_DATA(u_arg);
294 return security_xfrm_state_alloc(x, uctx);
295}
296
060f02a3
NT		 297static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
298{
299 struct rtattr *rta = u_arg;
300 xfrm_address_t *p, *uaddrp;
301
302 if (!rta)
303 return 0;
304
305 uaddrp = RTA_DATA(rta);
cdbc6dae 306 p = kmemdup(uaddrp, sizeof(*p), GFP_KERNEL);
060f02a3
NT		 307 if (!p)
308 return -ENOMEM;
309
060f02a3
NT		 310 *addrpp = p;
311 return 0;
312}
313
1da177e4
LT		 314static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
315{
316 memcpy(&x->id, &p->id, sizeof(x->id));
317 memcpy(&x->sel, &p->sel, sizeof(x->sel));
318 memcpy(&x->lft, &p->lft, sizeof(x->lft));
319 x->props.mode = p->mode;
320 x->props.replay_window = p->replay_window;
321 x->props.reqid = p->reqid;
322 x->props.family = p->family;
54489c14 323 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4
LT		 324 x->props.flags = p->flags;
325}
326
d51d081d
JHS		 327/*
328 * someday when pfkey also has support, we could have the code
329 * somehow made shareable and move it to xfrm_state.c - JHS
330 *
331*/
332static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
333{
334 int err = - EINVAL;
335 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
336 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
337 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
338 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
339
340 if (rp) {
341 struct xfrm_replay_state *replay;
342 if (RTA_PAYLOAD(rp) < sizeof(*replay))
343 goto error;
344 replay = RTA_DATA(rp);
345 memcpy(&x->replay, replay, sizeof(*replay));
346 memcpy(&x->preplay, replay, sizeof(*replay));
347 }
348
349 if (lt) {
350 struct xfrm_lifetime_cur *ltime;
351 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
352 goto error;
353 ltime = RTA_DATA(lt);
354 x->curlft.bytes = ltime->bytes;
355 x->curlft.packets = ltime->packets;
356 x->curlft.add_time = ltime->add_time;
357 x->curlft.use_time = ltime->use_time;
358 }
359
360 if (et) {
361 if (RTA_PAYLOAD(et) < sizeof(u32))
362 goto error;
363 x->replay_maxage = *(u32*)RTA_DATA(et);
364 }
365
366 if (rt) {
367 if (RTA_PAYLOAD(rt) < sizeof(u32))
368 goto error;
369 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
370 }
371
372 return 0;
373error:
374 return err;
375}
376
1da177e4
LT		 377static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
378 struct rtattr **xfrma,
379 int *errp)
380{
381 struct xfrm_state *x = xfrm_state_alloc();
382 int err = -ENOMEM;
383
384 if (!x)
385 goto error_no_put;
386
387 copy_from_user_state(x, p);
388
389 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
390 xfrm_aalg_get_byname,
391 xfrma[XFRMA_ALG_AUTH-1])))
392 goto error;
393 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
394 xfrm_ealg_get_byname,
395 xfrma[XFRMA_ALG_CRYPT-1])))
396 goto error;
397 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
398 xfrm_calg_get_byname,
399 xfrma[XFRMA_ALG_COMP-1])))
400 goto error;
401 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
402 goto error;
060f02a3
NT		 403 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
404 goto error;
72cb6962 405 err = xfrm_init_state(x);
1da177e4
LT		 406 if (err)
407 goto error;
408
df71837d
TJ		 409 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
410 goto error;
411
1da177e4 412 x->km.seq = p->seq;
d51d081d
JHS		 413 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
414 /* sysctl_xfrm_aevent_etime is in 100ms units */
415 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
416 x->preplay.bitmap = 0;
417 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
418 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
419
420 /* override default values from above */
421
422 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
423 if (err < 0)
424 goto error;
1da177e4
LT		 425
426 return x;
427
428error:
429 x->km.state = XFRM_STATE_DEAD;
430 xfrm_state_put(x);
431error_no_put:
432 *errp = err;
433 return NULL;
434}
435
22e70050
CH		 436static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
437 struct rtattr **xfrma)
1da177e4
LT		 438{
439 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
440 struct xfrm_state *x;
441 int err;
26b15dad 442 struct km_event c;
1da177e4 443
22e70050 444 err = verify_newsa_info(p, xfrma);
1da177e4
LT		 445 if (err)
446 return err;
447
22e70050 448 x = xfrm_state_construct(p, xfrma, &err);
1da177e4
LT		 449 if (!x)
450 return err;
451
26b15dad 452 xfrm_state_hold(x);
1da177e4
LT		 453 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
454 err = xfrm_state_add(x);
455 else
456 err = xfrm_state_update(x);
457
161a09e7
JL		 458 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
459 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
460
1da177e4
LT		 461 if (err < 0) {
462 x->km.state = XFRM_STATE_DEAD;
21380b81 463 __xfrm_state_put(x);
7d6dfe1f 464 goto out;
1da177e4
LT		 465 }
466
26b15dad
JHS		 467 c.seq = nlh->nlmsg_seq;
468 c.pid = nlh->nlmsg_pid;
f60f6b8f 469 c.event = nlh->nlmsg_type;
26b15dad
JHS		 470
471 km_state_notify(x, &c);
7d6dfe1f 472out:
26b15dad 473 xfrm_state_put(x);
1da177e4
LT		 474 return err;
475}
476
eb2971b6
MN		 477static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
478 struct rtattr **xfrma,
479 int *errp)
480{
481 struct xfrm_state *x = NULL;
482 int err;
483
484 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
485 err = -ESRCH;
486 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
487 } else {
488 xfrm_address_t *saddr = NULL;
489
490 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
491 if (err)
492 goto out;
493
494 if (!saddr) {
495 err = -EINVAL;
496 goto out;
497 }
498
9abbffee 499 err = -ESRCH;
eb2971b6
MN		 500 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
501 p->family);
502 }
503
504 out:
505 if (!x && errp)
506 *errp = err;
507 return x;
508}
509
22e70050
CH		 510static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
511 struct rtattr **xfrma)
1da177e4
LT		 512{
513 struct xfrm_state *x;
eb2971b6 514 int err = -ESRCH;
26b15dad 515 struct km_event c;
1da177e4
LT		 516 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
517
22e70050 518 x = xfrm_user_state_lookup(p, xfrma, &err);
1da177e4 519 if (x == NULL)
eb2971b6 520 return err;
1da177e4 521
6f68dc37 522 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 523 goto out;
524
1da177e4 525 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 526 err = -EPERM;
527 goto out;
1da177e4
LT		 528 }
529
26b15dad 530 err = xfrm_state_delete(x);
161a09e7 531
c8c05a8e
CZ		 532 if (err < 0)
533 goto out;
26b15dad
JHS		 534
535 c.seq = nlh->nlmsg_seq;
536 c.pid = nlh->nlmsg_pid;
f60f6b8f 537 c.event = nlh->nlmsg_type;
26b15dad 538 km_state_notify(x, &c);
1da177e4 539
c8c05a8e 540out:
16bec31d
EP		 541 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
542 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
c8c05a8e 543 xfrm_state_put(x);
26b15dad 544 return err;
1da177e4
LT		 545}
546
547static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
548{
549 memcpy(&p->id, &x->id, sizeof(p->id));
550 memcpy(&p->sel, &x->sel, sizeof(p->sel));
551 memcpy(&p->lft, &x->lft, sizeof(p->lft));
552 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
553 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 554 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 555 p->mode = x->props.mode;
556 p->replay_window = x->props.replay_window;
557 p->reqid = x->props.reqid;
558 p->family = x->props.family;
559 p->flags = x->props.flags;
560 p->seq = x->km.seq;
561}
562
563struct xfrm_dump_info {
564 struct sk_buff *in_skb;
565 struct sk_buff *out_skb;
566 u32 nlmsg_seq;
567 u16 nlmsg_flags;
568 int start_idx;
569 int this_idx;
570};
571
572static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
573{
574 struct xfrm_dump_info *sp = ptr;
575 struct sk_buff *in_skb = sp->in_skb;
576 struct sk_buff *skb = sp->out_skb;
577 struct xfrm_usersa_info *p;
578 struct nlmsghdr *nlh;
27a884dc 579 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 580
581 if (sp->this_idx < sp->start_idx)
582 goto out;
583
584 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
585 sp->nlmsg_seq,
586 XFRM_MSG_NEWSA, sizeof(*p));
587 nlh->nlmsg_flags = sp->nlmsg_flags;
588
589 p = NLMSG_DATA(nlh);
590 copy_to_user_state(x, p);
591
592 if (x->aalg)
593 RTA_PUT(skb, XFRMA_ALG_AUTH,
594 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
595 if (x->ealg)
596 RTA_PUT(skb, XFRMA_ALG_CRYPT,
597 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
598 if (x->calg)
599 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
600
601 if (x->encap)
602 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
603
df71837d
TJ		 604 if (x->security) {
605 int ctx_size = sizeof(struct xfrm_sec_ctx) +
606 x->security->ctx_len;
607 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
608 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
609
610 uctx->exttype = XFRMA_SEC_CTX;
611 uctx->len = ctx_size;
612 uctx->ctx_doi = x->security->ctx_doi;
613 uctx->ctx_alg = x->security->ctx_alg;
614 uctx->ctx_len = x->security->ctx_len;
615 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
616 }
060f02a3
NT		 617
618 if (x->coaddr)
619 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
620
9afaca05
MN		 621 if (x->lastused)
622 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
623
27a884dc 624 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1da177e4
LT		 625out:
626 sp->this_idx++;
627 return 0;
628
629nlmsg_failure:
630rtattr_failure:
dc5fc579 631 nlmsg_trim(skb, b);
1da177e4
LT		 632 return -1;
633}
634
635static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
636{
637 struct xfrm_dump_info info;
638
639 info.in_skb = cb->skb;
640 info.out_skb = skb;
641 info.nlmsg_seq = cb->nlh->nlmsg_seq;
642 info.nlmsg_flags = NLM_F_MULTI;
643 info.this_idx = 0;
644 info.start_idx = cb->args[0];
dc00a525 645 (void) xfrm_state_walk(0, dump_one_state, &info);
1da177e4
LT		 646 cb->args[0] = info.this_idx;
647
648 return skb->len;
649}
650
651static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
652 struct xfrm_state *x, u32 seq)
653{
654 struct xfrm_dump_info info;
655 struct sk_buff *skb;
656
657 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
658 if (!skb)
659 return ERR_PTR(-ENOMEM);
660
1da177e4
LT		 661 info.in_skb = in_skb;
662 info.out_skb = skb;
663 info.nlmsg_seq = seq;
664 info.nlmsg_flags = 0;
665 info.this_idx = info.start_idx = 0;
666
667 if (dump_one_state(x, 0, &info)) {
668 kfree_skb(skb);
669 return NULL;
670 }
671
672 return skb;
673}
674
28d8909b
JHS		 675static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
676{
677 struct xfrm_sadinfo si;
678 struct nlmsghdr *nlh;
679 u32 *f;
680
681 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
682 if (nlh == NULL) /* shouldnt really happen ... */
683 return -EMSGSIZE;
684
685 f = nlmsg_data(nlh);
686 *f = flags;
687 xfrm_sad_getinfo(&si);
688
689 if (flags & XFRM_SAD_HMASK)
690 NLA_PUT_U32(skb, XFRMA_SADHMASK, si.sadhcnt);
691 if (flags & XFRM_SAD_HMAX)
692 NLA_PUT_U32(skb, XFRMA_SADHMAX, si.sadhmcnt);
693 if (flags & XFRM_SAD_CNT)
694 NLA_PUT_U32(skb, XFRMA_SADCNT, si.sadcnt);
695
696 return nlmsg_end(skb, nlh);
697
698nla_put_failure:
699 nlmsg_cancel(skb, nlh);
700 return -EMSGSIZE;
701}
702
703static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
704 struct rtattr **xfrma)
705{
706 struct sk_buff *r_skb;
707 u32 *flags = NLMSG_DATA(nlh);
708 u32 spid = NETLINK_CB(skb).pid;
709 u32 seq = nlh->nlmsg_seq;
710 int len = NLMSG_LENGTH(sizeof(u32));
711
712 if (*flags & XFRM_SAD_HMASK)
713 len += RTA_SPACE(sizeof(u32));
714 if (*flags & XFRM_SAD_HMAX)
715 len += RTA_SPACE(sizeof(u32));
716 if (*flags & XFRM_SAD_CNT)
717 len += RTA_SPACE(sizeof(u32));
718
719 r_skb = alloc_skb(len, GFP_ATOMIC);
720
721 if (r_skb == NULL)
722 return -ENOMEM;
723
724 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
725 BUG();
726
727 return nlmsg_unicast(xfrm_nl, r_skb, spid);
728}
729
22e70050
CH		 730static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
731 struct rtattr **xfrma)
1da177e4
LT		 732{
733 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
734 struct xfrm_state *x;
735 struct sk_buff *resp_skb;
eb2971b6 736 int err = -ESRCH;
1da177e4 737
22e70050 738 x = xfrm_user_state_lookup(p, xfrma, &err);
1da177e4
LT		 739 if (x == NULL)
740 goto out_noput;
741
742 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
743 if (IS_ERR(resp_skb)) {
744 err = PTR_ERR(resp_skb);
745 } else {
746 err = netlink_unicast(xfrm_nl, resp_skb,
747 NETLINK_CB(skb).pid, MSG_DONTWAIT);
748 }
749 xfrm_state_put(x);
750out_noput:
751 return err;
752}
753
754static int verify_userspi_info(struct xfrm_userspi_info *p)
755{
756 switch (p->info.id.proto) {
757 case IPPROTO_AH:
758 case IPPROTO_ESP:
759 break;
760
761 case IPPROTO_COMP:
762 /* IPCOMP spi is 16-bits. */
763 if (p->max >= 0x10000)
764 return -EINVAL;
765 break;
766
767 default:
768 return -EINVAL;
3ff50b79 769 }
1da177e4
LT		 770
771 if (p->min > p->max)
772 return -EINVAL;
773
774 return 0;
775}
776
22e70050
CH		 777static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
778 struct rtattr **xfrma)
1da177e4
LT		 779{
780 struct xfrm_state *x;
781 struct xfrm_userspi_info *p;
782 struct sk_buff *resp_skb;
783 xfrm_address_t *daddr;
784 int family;
785 int err;
786
787 p = NLMSG_DATA(nlh);
788 err = verify_userspi_info(p);
789 if (err)
790 goto out_noput;
791
792 family = p->info.family;
793 daddr = &p->info.id.daddr;
794
795 x = NULL;
796 if (p->info.seq) {
797 x = xfrm_find_acq_byseq(p->info.seq);
798 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
799 xfrm_state_put(x);
800 x = NULL;
801 }
802 }
803
804 if (!x)
805 x = xfrm_find_acq(p->info.mode, p->info.reqid,
806 p->info.id.proto, daddr,
807 &p->info.saddr, 1,
808 family);
809 err = -ENOENT;
810 if (x == NULL)
811 goto out_noput;
812
813 resp_skb = ERR_PTR(-ENOENT);
814
815 spin_lock_bh(&x->lock);
816 if (x->km.state != XFRM_STATE_DEAD) {
817 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
818 if (x->id.spi)
819 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
820 }
821 spin_unlock_bh(&x->lock);
822
823 if (IS_ERR(resp_skb)) {
824 err = PTR_ERR(resp_skb);
825 goto out;
826 }
827
828 err = netlink_unicast(xfrm_nl, resp_skb,
829 NETLINK_CB(skb).pid, MSG_DONTWAIT);
830
831out:
832 xfrm_state_put(x);
833out_noput:
834 return err;
835}
836
b798a9ed 837static int verify_policy_dir(u8 dir)
1da177e4
LT		 838{
839 switch (dir) {
840 case XFRM_POLICY_IN:
841 case XFRM_POLICY_OUT:
842 case XFRM_POLICY_FWD:
843 break;
844
845 default:
846 return -EINVAL;
3ff50b79 847 }
1da177e4
LT		 848
849 return 0;
850}
851
b798a9ed 852static int verify_policy_type(u8 type)
f7b6983f
MN		 853{
854 switch (type) {
855 case XFRM_POLICY_TYPE_MAIN:
856#ifdef CONFIG_XFRM_SUB_POLICY
857 case XFRM_POLICY_TYPE_SUB:
858#endif
859 break;
860
861 default:
862 return -EINVAL;
3ff50b79 863 }
f7b6983f
MN		 864
865 return 0;
866}
867
1da177e4
LT		 868static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
869{
870 switch (p->share) {
871 case XFRM_SHARE_ANY:
872 case XFRM_SHARE_SESSION:
873 case XFRM_SHARE_USER:
874 case XFRM_SHARE_UNIQUE:
875 break;
876
877 default:
878 return -EINVAL;
3ff50b79 879 }
1da177e4
LT		 880
881 switch (p->action) {
882 case XFRM_POLICY_ALLOW:
883 case XFRM_POLICY_BLOCK:
884 break;
885
886 default:
887 return -EINVAL;
3ff50b79 888 }
1da177e4
LT		 889
890 switch (p->sel.family) {
891 case AF_INET:
892 break;
893
894 case AF_INET6:
895#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
896 break;
897#else
898 return -EAFNOSUPPORT;
899#endif
900
901 default:
902 return -EINVAL;
3ff50b79 903 }
1da177e4
LT		 904
905 return verify_policy_dir(p->dir);
906}
907
df71837d
TJ		 908static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
909{
910 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
911 struct xfrm_user_sec_ctx *uctx;
912
913 if (!rt)
914 return 0;
915
916 uctx = RTA_DATA(rt);
917 return security_xfrm_policy_alloc(pol, uctx);
918}
919
1da177e4
LT		 920static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
921 int nr)
922{
923 int i;
924
925 xp->xfrm_nr = nr;
926 for (i = 0; i < nr; i++, ut++) {
927 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
928
929 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
930 memcpy(&t->saddr, &ut->saddr,
931 sizeof(xfrm_address_t));
932 t->reqid = ut->reqid;
933 t->mode = ut->mode;
934 t->share = ut->share;
935 t->optional = ut->optional;
936 t->aalgos = ut->aalgos;
937 t->ealgos = ut->ealgos;
938 t->calgos = ut->calgos;
8511d01d 939 t->encap_family = ut->family;
1da177e4
LT		 940 }
941}
942
b4ad86bf
DM		 943static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
944{
945 int i;
946
947 if (nr > XFRM_MAX_DEPTH)
948 return -EINVAL;
949
950 for (i = 0; i < nr; i++) {
951 /* We never validated the ut->family value, so many
952 * applications simply leave it at zero. The check was
953 * never made and ut->family was ignored because all
954 * templates could be assumed to have the same family as
955 * the policy itself. Now that we will have ipv4-in-ipv6
956 * and ipv6-in-ipv4 tunnels, this is no longer true.
957 */
958 if (!ut[i].family)
959 ut[i].family = family;
960
961 switch (ut[i].family) {
962 case AF_INET:
963 break;
964#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
965 case AF_INET6:
966 break;
967#endif
968 default:
969 return -EINVAL;
3ff50b79 970 }
b4ad86bf
DM		 971 }
972
973 return 0;
974}
975
1da177e4
LT		 976static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
977{
978 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1da177e4
LT		 979
980 if (!rt) {
981 pol->xfrm_nr = 0;
982 } else {
b4ad86bf
DM		 983 struct xfrm_user_tmpl *utmpl = RTA_DATA(rt);
984 int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
985 int err;
1da177e4 986
b4ad86bf
DM		 987 err = validate_tmpl(nr, utmpl, pol->family);
988 if (err)
989 return err;
1da177e4
LT		 990
991 copy_templates(pol, RTA_DATA(rt), nr);
992 }
993 return 0;
994}
995
f7b6983f
MN		 996static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
997{
998 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
999 struct xfrm_userpolicy_type *upt;
b798a9ed 1000 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1001 int err;
1002
1003 if (rt) {
1004 if (rt->rta_len < sizeof(*upt))
1005 return -EINVAL;
1006
1007 upt = RTA_DATA(rt);
1008 type = upt->type;
1009 }
1010
1011 err = verify_policy_type(type);
1012 if (err)
1013 return err;
1014
1015 *tp = type;
1016 return 0;
1017}
1018
1da177e4
LT		 1019static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1020{
1021 xp->priority = p->priority;
1022 xp->index = p->index;
1023 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1024 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1025 xp->action = p->action;
1026 xp->flags = p->flags;
1027 xp->family = p->sel.family;
1028 /* XXX xp->share = p->share; */
1029}
1030
1031static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1032{
1033 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1034 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1035 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1036 p->priority = xp->priority;
1037 p->index = xp->index;
1038 p->sel.family = xp->family;
1039 p->dir = dir;
1040 p->action = xp->action;
1041 p->flags = xp->flags;
1042 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1043}
1044
1045static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
1046{
1047 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1048 int err;
1049
1050 if (!xp) {
1051 *errp = -ENOMEM;
1052 return NULL;
1053 }
1054
1055 copy_from_user_policy(xp, p);
df71837d 1056
f7b6983f
MN		 1057 err = copy_from_user_policy_type(&xp->type, xfrma);
1058 if (err)
1059 goto error;
1060
df71837d
TJ		 1061 if (!(err = copy_from_user_tmpl(xp, xfrma)))
1062 err = copy_from_user_sec_ctx(xp, xfrma);
f7b6983f
MN		 1063 if (err)
1064 goto error;
1da177e4
LT		 1065
1066 return xp;
f7b6983f
MN		 1067 error:
1068 *errp = err;
1069 kfree(xp);
1070 return NULL;
1da177e4
LT		 1071}
1072
22e70050
CH		 1073static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1074 struct rtattr **xfrma)
1da177e4
LT		 1075{
1076 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
1077 struct xfrm_policy *xp;
26b15dad 1078 struct km_event c;
1da177e4
LT		 1079 int err;
1080 int excl;
1081
1082 err = verify_newpolicy_info(p);
df71837d
TJ		 1083 if (err)
1084 return err;
22e70050 1085 err = verify_sec_ctx_len(xfrma);
1da177e4
LT		 1086 if (err)
1087 return err;
1088
22e70050 1089 xp = xfrm_policy_construct(p, xfrma, &err);
1da177e4
LT		 1090 if (!xp)
1091 return err;
1092
26b15dad
JHS		 1093 /* shouldnt excl be based on nlh flags??
1094 * Aha! this is anti-netlink really i.e more pfkey derived
1095 * in netlink excl is a flag and you wouldnt need
1096 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1097 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1098 err = xfrm_policy_insert(p->dir, xp, excl);
161a09e7
JL		 1099 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1100 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1101
1da177e4 1102 if (err) {
5f8ac64b 1103 security_xfrm_policy_free(xp);
1da177e4
LT		 1104 kfree(xp);
1105 return err;
1106 }
1107
f60f6b8f 1108 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1109 c.seq = nlh->nlmsg_seq;
1110 c.pid = nlh->nlmsg_pid;
1111 km_policy_notify(xp, p->dir, &c);
1112
1da177e4
LT		 1113 xfrm_pol_put(xp);
1114
1115 return 0;
1116}
1117
1118static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1119{
1120 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1121 int i;
1122
1123 if (xp->xfrm_nr == 0)
1124 return 0;
1125
1126 for (i = 0; i < xp->xfrm_nr; i++) {
1127 struct xfrm_user_tmpl *up = &vec[i];
1128 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1129
1130 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1131 up->family = kp->encap_family;
1da177e4
LT		 1132 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1133 up->reqid = kp->reqid;
1134 up->mode = kp->mode;
1135 up->share = kp->share;
1136 up->optional = kp->optional;
1137 up->aalgos = kp->aalgos;
1138 up->ealgos = kp->ealgos;
1139 up->calgos = kp->calgos;
1140 }
1141 RTA_PUT(skb, XFRMA_TMPL,
1142 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1143 vec);
1144
1145 return 0;
1146
1147rtattr_failure:
1148 return -1;
1149}
1150
0d681623 1151static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
df71837d 1152{
0d681623
SH		 1153 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1154 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1155 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1156
1157 uctx->exttype = XFRMA_SEC_CTX;
1158 uctx->len = ctx_size;
1159 uctx->ctx_doi = s->ctx_doi;
1160 uctx->ctx_alg = s->ctx_alg;
1161 uctx->ctx_len = s->ctx_len;
1162 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
a716c119 1163 return 0;
df71837d 1164
0d681623
SH		 1165 rtattr_failure:
1166 return -1;
1167}
1168
1169static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1170{
1171 if (x->security) {
1172 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1173 }
1174 return 0;
0d681623 1175}
df71837d 1176
0d681623
SH		 1177static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1178{
1179 if (xp->security) {
1180 return copy_sec_ctx(xp->security, skb);
1181 }
1182 return 0;
df71837d
TJ		 1183}
1184
f7b6983f 1185#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1186static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1187{
1188 struct xfrm_userpolicy_type upt;
1189
1190 memset(&upt, 0, sizeof(upt));
1459bb36 1191 upt.type = type;
f7b6983f
MN		 1192
1193 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1194
1195 return 0;
1196
1197rtattr_failure:
1198 return -1;
1199}
1200
1201#else
b798a9ed 1202static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1203{
1204 return 0;
1205}
1206#endif
1207
1da177e4
LT		 1208static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1209{
1210 struct xfrm_dump_info *sp = ptr;
1211 struct xfrm_userpolicy_info *p;
1212 struct sk_buff *in_skb = sp->in_skb;
1213 struct sk_buff *skb = sp->out_skb;
1214 struct nlmsghdr *nlh;
27a884dc 1215 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 1216
1217 if (sp->this_idx < sp->start_idx)
1218 goto out;
1219
1220 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1221 sp->nlmsg_seq,
1222 XFRM_MSG_NEWPOLICY, sizeof(*p));
1223 p = NLMSG_DATA(nlh);
1224 nlh->nlmsg_flags = sp->nlmsg_flags;
1225
1226 copy_to_user_policy(xp, p, dir);
1227 if (copy_to_user_tmpl(xp, skb) < 0)
1228 goto nlmsg_failure;
df71837d
TJ		 1229 if (copy_to_user_sec_ctx(xp, skb))
1230 goto nlmsg_failure;
1459bb36 1231 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 1232 goto nlmsg_failure;
1da177e4 1233
27a884dc 1234 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1da177e4
LT		 1235out:
1236 sp->this_idx++;
1237 return 0;
1238
1239nlmsg_failure:
dc5fc579 1240 nlmsg_trim(skb, b);
1da177e4
LT		 1241 return -1;
1242}
1243
1244static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1245{
1246 struct xfrm_dump_info info;
1247
1248 info.in_skb = cb->skb;
1249 info.out_skb = skb;
1250 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1251 info.nlmsg_flags = NLM_F_MULTI;
1252 info.this_idx = 0;
1253 info.start_idx = cb->args[0];
f7b6983f
MN		 1254 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1255#ifdef CONFIG_XFRM_SUB_POLICY
1256 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1257#endif
1da177e4
LT		 1258 cb->args[0] = info.this_idx;
1259
1260 return skb->len;
1261}
1262
1263static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1264 struct xfrm_policy *xp,
1265 int dir, u32 seq)
1266{
1267 struct xfrm_dump_info info;
1268 struct sk_buff *skb;
1269
1270 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1271 if (!skb)
1272 return ERR_PTR(-ENOMEM);
1273
1da177e4
LT		 1274 info.in_skb = in_skb;
1275 info.out_skb = skb;
1276 info.nlmsg_seq = seq;
1277 info.nlmsg_flags = 0;
1278 info.this_idx = info.start_idx = 0;
1279
1280 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1281 kfree_skb(skb);
1282 return NULL;
1283 }
1284
1285 return skb;
1286}
1287
22e70050
CH		 1288static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1289 struct rtattr **xfrma)
1da177e4
LT		 1290{
1291 struct xfrm_policy *xp;
1292 struct xfrm_userpolicy_id *p;
b798a9ed 1293 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1294 int err;
26b15dad 1295 struct km_event c;
1da177e4
LT		 1296 int delete;
1297
1298 p = NLMSG_DATA(nlh);
1299 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1300
22e70050 1301 err = copy_from_user_policy_type(&type, xfrma);
f7b6983f
MN		 1302 if (err)
1303 return err;
1304
1da177e4
LT		 1305 err = verify_policy_dir(p->dir);
1306 if (err)
1307 return err;
1308
1309 if (p->index)
ef41aaa0 1310 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
df71837d 1311 else {
22e70050 1312 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
df71837d
TJ		 1313 struct xfrm_policy tmp;
1314
22e70050 1315 err = verify_sec_ctx_len(xfrma);
df71837d
TJ		 1316 if (err)
1317 return err;
1318
1319 memset(&tmp, 0, sizeof(struct xfrm_policy));
1320 if (rt) {
1321 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1322
1323 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1324 return err;
1325 }
ef41aaa0
EP		 1326 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1327 delete, &err);
df71837d
TJ		 1328 security_xfrm_policy_free(&tmp);
1329 }
1da177e4
LT		 1330 if (xp == NULL)
1331 return -ENOENT;
1332
1333 if (!delete) {
1334 struct sk_buff *resp_skb;
1335
1336 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1337 if (IS_ERR(resp_skb)) {
1338 err = PTR_ERR(resp_skb);
1339 } else {
1340 err = netlink_unicast(xfrm_nl, resp_skb,
1341 NETLINK_CB(skb).pid,
1342 MSG_DONTWAIT);
1343 }
26b15dad 1344 } else {
13fcfbb0
DM		 1345 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1346 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1347
1348 if (err != 0)
c8c05a8e 1349 goto out;
13fcfbb0 1350
e7443892 1351 c.data.byid = p->index;
f60f6b8f 1352 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1353 c.seq = nlh->nlmsg_seq;
1354 c.pid = nlh->nlmsg_pid;
1355 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1356 }
1357
c8c05a8e 1358out:
ef41aaa0 1359 xfrm_pol_put(xp);
1da177e4
LT		 1360 return err;
1361}
1362
22e70050
CH		 1363static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1364 struct rtattr **xfrma)
1da177e4 1365{
26b15dad 1366 struct km_event c;
1da177e4 1367 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
161a09e7 1368 struct xfrm_audit audit_info;
1da177e4 1369
161a09e7
JL		 1370 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1371 audit_info.secid = NETLINK_CB(skb).sid;
1372 xfrm_state_flush(p->proto, &audit_info);
bf08867f 1373 c.data.proto = p->proto;
f60f6b8f 1374 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1375 c.seq = nlh->nlmsg_seq;
1376 c.pid = nlh->nlmsg_pid;
1377 km_state_notify(NULL, &c);
1378
1da177e4
LT		 1379 return 0;
1380}
1381
d51d081d
JHS		 1382
1383static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1384{
1385 struct xfrm_aevent_id *id;
1386 struct nlmsghdr *nlh;
1387 struct xfrm_lifetime_cur ltime;
27a884dc 1388 unsigned char *b = skb_tail_pointer(skb);
d51d081d
JHS		 1389
1390 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1391 id = NLMSG_DATA(nlh);
1392 nlh->nlmsg_flags = 0;
1393
2b5f6dcc 1394 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
d51d081d
JHS		 1395 id->sa_id.spi = x->id.spi;
1396 id->sa_id.family = x->props.family;
1397 id->sa_id.proto = x->id.proto;
2b5f6dcc
JHS		 1398 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1399 id->reqid = x->props.reqid;
d51d081d
JHS		 1400 id->flags = c->data.aevent;
1401
1402 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1403
1404 ltime.bytes = x->curlft.bytes;
1405 ltime.packets = x->curlft.packets;
1406 ltime.add_time = x->curlft.add_time;
1407 ltime.use_time = x->curlft.use_time;
1408
1409 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1410
1411 if (id->flags&XFRM_AE_RTHR) {
1412 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1413 }
1414
1415 if (id->flags&XFRM_AE_ETHR) {
1416 u32 etimer = x->replay_maxage*10/HZ;
1417 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1418 }
1419
27a884dc 1420 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
d51d081d
JHS		 1421 return skb->len;
1422
1423rtattr_failure:
1424nlmsg_failure:
dc5fc579 1425 nlmsg_trim(skb, b);
d51d081d
JHS		 1426 return -1;
1427}
1428
22e70050
CH		 1429static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1430 struct rtattr **xfrma)
d51d081d
JHS		 1431{
1432 struct xfrm_state *x;
1433 struct sk_buff *r_skb;
1434 int err;
1435 struct km_event c;
1436 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1437 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1438 struct xfrm_usersa_id *id = &p->sa_id;
1439
1440 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1441 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1442
1443 if (p->flags&XFRM_AE_RTHR)
1444 len+=RTA_SPACE(sizeof(u32));
1445
1446 if (p->flags&XFRM_AE_ETHR)
1447 len+=RTA_SPACE(sizeof(u32));
1448
1449 r_skb = alloc_skb(len, GFP_ATOMIC);
1450 if (r_skb == NULL)
1451 return -ENOMEM;
1452
1453 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1454 if (x == NULL) {
b08d5840 1455 kfree_skb(r_skb);
d51d081d
JHS		 1456 return -ESRCH;
1457 }
1458
1459 /*
1460 * XXX: is this lock really needed - none of the other
1461 * gets lock (the concern is things getting updated
1462 * while we are still reading) - jhs
1463 */
1464 spin_lock_bh(&x->lock);
1465 c.data.aevent = p->flags;
1466 c.seq = nlh->nlmsg_seq;
1467 c.pid = nlh->nlmsg_pid;
1468
1469 if (build_aevent(r_skb, x, &c) < 0)
1470 BUG();
1471 err = netlink_unicast(xfrm_nl, r_skb,
1472 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1473 spin_unlock_bh(&x->lock);
1474 xfrm_state_put(x);
1475 return err;
1476}
1477
22e70050
CH		 1478static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1479 struct rtattr **xfrma)
d51d081d
JHS		 1480{
1481 struct xfrm_state *x;
1482 struct km_event c;
1483 int err = - EINVAL;
1484 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1485 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1486 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1487
1488 if (!lt && !rp)
1489 return err;
1490
1491 /* pedantic mode - thou shalt sayeth replaceth */
1492 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1493 return err;
1494
1495 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1496 if (x == NULL)
1497 return -ESRCH;
1498
1499 if (x->km.state != XFRM_STATE_VALID)
1500 goto out;
1501
1502 spin_lock_bh(&x->lock);
22e70050 1503 err = xfrm_update_ae_params(x, xfrma);
d51d081d
JHS		 1504 spin_unlock_bh(&x->lock);
1505 if (err < 0)
1506 goto out;
1507
1508 c.event = nlh->nlmsg_type;
1509 c.seq = nlh->nlmsg_seq;
1510 c.pid = nlh->nlmsg_pid;
1511 c.data.aevent = XFRM_AE_CU;
1512 km_state_notify(x, &c);
1513 err = 0;
1514out:
1515 xfrm_state_put(x);
1516 return err;
1517}
1518
22e70050
CH		 1519static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1520 struct rtattr **xfrma)
1da177e4 1521{
f7b6983f 1522 struct km_event c;
b798a9ed 1523 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1524 int err;
161a09e7 1525 struct xfrm_audit audit_info;
f7b6983f 1526
22e70050 1527 err = copy_from_user_policy_type(&type, xfrma);
f7b6983f
MN		 1528 if (err)
1529 return err;
26b15dad 1530
161a09e7
JL		 1531 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1532 audit_info.secid = NETLINK_CB(skb).sid;
1533 xfrm_policy_flush(type, &audit_info);
f7b6983f 1534 c.data.type = type;
f60f6b8f 1535 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1536 c.seq = nlh->nlmsg_seq;
1537 c.pid = nlh->nlmsg_pid;
1538 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1539 return 0;
1540}
1541
22e70050
CH		 1542static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1543 struct rtattr **xfrma)
6c5c8ca7
JHS		 1544{
1545 struct xfrm_policy *xp;
1546 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1547 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1548 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7
JHS		 1549 int err = -ENOENT;
1550
22e70050 1551 err = copy_from_user_policy_type(&type, xfrma);
f7b6983f
MN		 1552 if (err)
1553 return err;
1554
6c5c8ca7 1555 if (p->index)
ef41aaa0 1556 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
6c5c8ca7 1557 else {
22e70050 1558 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
6c5c8ca7
JHS		 1559 struct xfrm_policy tmp;
1560
22e70050 1561 err = verify_sec_ctx_len(xfrma);
6c5c8ca7
JHS		 1562 if (err)
1563 return err;
1564
1565 memset(&tmp, 0, sizeof(struct xfrm_policy));
1566 if (rt) {
1567 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1568
1569 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1570 return err;
1571 }
ef41aaa0
EP		 1572 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1573 0, &err);
6c5c8ca7
JHS		 1574 security_xfrm_policy_free(&tmp);
1575 }
1576
1577 if (xp == NULL)
ef41aaa0
EP		 1578 return -ENOENT;
1579 read_lock(&xp->lock);
6c5c8ca7
JHS		 1580 if (xp->dead) {
1581 read_unlock(&xp->lock);
1582 goto out;
1583 }
1584
1585 read_unlock(&xp->lock);
1586 err = 0;
1587 if (up->hard) {
1588 xfrm_policy_delete(xp, p->dir);
161a09e7
JL		 1589 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1590 AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);
1591
6c5c8ca7
JHS		 1592 } else {
1593 // reset the timers here?
1594 printk("Dont know what to do with soft policy expire\n");
1595 }
1596 km_policy_expired(xp, p->dir, up->hard, current->pid);
1597
1598out:
1599 xfrm_pol_put(xp);
1600 return err;
1601}
1602
22e70050
CH		 1603static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1604 struct rtattr **xfrma)
53bc6b4d
JHS		 1605{
1606 struct xfrm_state *x;
1607 int err;
1608 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1609 struct xfrm_usersa_info *p = &ue->state;
1610
1611 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 1612
3a765aa5 1613 err = -ENOENT;
53bc6b4d
JHS		 1614 if (x == NULL)
1615 return err;
1616
53bc6b4d 1617 spin_lock_bh(&x->lock);
3a765aa5 1618 err = -EINVAL;
53bc6b4d
JHS		 1619 if (x->km.state != XFRM_STATE_VALID)
1620 goto out;
1621 km_state_expired(x, ue->hard, current->pid);
1622
161a09e7 1623 if (ue->hard) {
53bc6b4d 1624 __xfrm_state_delete(x);
161a09e7
JL		 1625 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1626 AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
1627 }
3a765aa5 1628 err = 0;
53bc6b4d
JHS		 1629out:
1630 spin_unlock_bh(&x->lock);
1631 xfrm_state_put(x);
1632 return err;
1633}
1634
22e70050
CH		 1635static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1636 struct rtattr **xfrma)
980ebd25
JHS		 1637{
1638 struct xfrm_policy *xp;
1639 struct xfrm_user_tmpl *ut;
1640 int i;
1641 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1642
1643 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1644 struct xfrm_state *x = xfrm_state_alloc();
1645 int err = -ENOMEM;
1646
1647 if (!x)
1648 return err;
1649
1650 err = verify_newpolicy_info(&ua->policy);
1651 if (err) {
1652 printk("BAD policy passed\n");
1653 kfree(x);
1654 return err;
1655 }
1656
1657 /* build an XP */
b4ad86bf
DM		 1658 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);
1659 if (!xp) {
980ebd25
JHS		 1660 kfree(x);
1661 return err;
1662 }
1663
1664 memcpy(&x->id, &ua->id, sizeof(ua->id));
1665 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1666 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1667
1668 ut = RTA_DATA(rt);
1669 /* extract the templates and for each call km_key */
1670 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1671 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1672 memcpy(&x->id, &t->id, sizeof(x->id));
1673 x->props.mode = t->mode;
1674 x->props.reqid = t->reqid;
1675 x->props.family = ut->family;
1676 t->aalgos = ua->aalgos;
1677 t->ealgos = ua->ealgos;
1678 t->calgos = ua->calgos;
1679 err = km_query(x, t, xp);
1680
1681 }
1682
1683 kfree(x);
1684 kfree(xp);
1685
1686 return 0;
1687}
1688
5c79de6e
SS		 1689#ifdef CONFIG_XFRM_MIGRATE
1690static int verify_user_migrate(struct rtattr **xfrma)
1691{
1692 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1693 struct xfrm_user_migrate *um;
1694
1695 if (!rt)
1696 return -EINVAL;
1697
1698 if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
1699 return -EINVAL;
1700
1701 return 0;
1702}
1703
1704static int copy_from_user_migrate(struct xfrm_migrate *ma,
1705 struct rtattr **xfrma, int *num)
1706{
1707 struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
1708 struct xfrm_user_migrate *um;
1709 int i, num_migrate;
1710
1711 um = RTA_DATA(rt);
1712 num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um);
1713
1714 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1715 return -EINVAL;
1716
1717 for (i = 0; i < num_migrate; i++, um++, ma++) {
1718 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1719 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1720 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1721 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1722
1723 ma->proto = um->proto;
1724 ma->mode = um->mode;
1725 ma->reqid = um->reqid;
1726
1727 ma->old_family = um->old_family;
1728 ma->new_family = um->new_family;
1729 }
1730
1731 *num = i;
1732 return 0;
1733}
1734
1735static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1736 struct rtattr **xfrma)
1737{
1738 struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh);
1739 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1740 u8 type;
1741 int err;
1742 int n = 0;
1743
1744 err = verify_user_migrate((struct rtattr **)xfrma);
1745 if (err)
1746 return err;
1747
1748 err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
1749 if (err)
1750 return err;
1751
1752 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1753 (struct rtattr **)xfrma, &n);
1754 if (err)
1755 return err;
1756
1757 if (!n)
1758 return 0;
1759
1760 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1761
1762 return 0;
1763}
1764#else
1765static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1766 struct rtattr **xfrma)
1767{
1768 return -ENOPROTOOPT;
1769}
1770#endif
1771
1772#ifdef CONFIG_XFRM_MIGRATE
1773static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1774{
1775 struct xfrm_user_migrate um;
1776
1777 memset(&um, 0, sizeof(um));
1778 um.proto = m->proto;
1779 um.mode = m->mode;
1780 um.reqid = m->reqid;
1781 um.old_family = m->old_family;
1782 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1783 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1784 um.new_family = m->new_family;
1785 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1786 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1787
1788 RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
1789 return 0;
1790
1791rtattr_failure:
1792 return -1;
1793}
1794
1795static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1796 int num_migrate, struct xfrm_selector *sel,
1797 u8 dir, u8 type)
1798{
1799 struct xfrm_migrate *mp;
1800 struct xfrm_userpolicy_id *pol_id;
1801 struct nlmsghdr *nlh;
27a884dc 1802 unsigned char *b = skb_tail_pointer(skb);
5c79de6e
SS		 1803 int i;
1804
1805 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
1806 pol_id = NLMSG_DATA(nlh);
1807 nlh->nlmsg_flags = 0;
1808
1809 /* copy data from selector, dir, and type to the pol_id */
1810 memset(pol_id, 0, sizeof(*pol_id));
1811 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1812 pol_id->dir = dir;
1813
1814 if (copy_to_user_policy_type(type, skb) < 0)
1815 goto nlmsg_failure;
1816
1817 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1818 if (copy_to_user_migrate(mp, skb) < 0)
1819 goto nlmsg_failure;
1820 }
1821
27a884dc 1822 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
5c79de6e
SS		 1823 return skb->len;
1824nlmsg_failure:
dc5fc579 1825 nlmsg_trim(skb, b);
5c79de6e
SS		 1826 return -1;
1827}
1828
1829static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1830 struct xfrm_migrate *m, int num_migrate)
1831{
1832 struct sk_buff *skb;
1833 size_t len;
1834
1835 len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
1836 len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
1837#ifdef CONFIG_XFRM_SUB_POLICY
1838 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
1839#endif
1840 skb = alloc_skb(len, GFP_ATOMIC);
1841 if (skb == NULL)
1842 return -ENOMEM;
1843
1844 /* build migrate */
1845 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1846 BUG();
1847
1848 NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
1849 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE,
1850 GFP_ATOMIC);
1851}
1852#else
1853static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1854 struct xfrm_migrate *m, int num_migrate)
1855{
1856 return -ENOPROTOOPT;
1857}
1858#endif
d51d081d 1859
492b558b
TG		 1860#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1861
1862static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1863 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1864 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1865 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1866 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1867 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1868 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1869 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 1870 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 1871 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b
TG		 1872 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1873 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 1874 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b
TG		 1875 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1876 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
d51d081d
JHS		 1877 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1878 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 1879 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 1880 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
566ec034 1881 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
1da177e4
LT		 1882};
1883
492b558b
TG		 1884#undef XMSGSIZE
1885
1da177e4 1886static struct xfrm_link {
22e70050 1887 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
1da177e4 1888 int (*dump)(struct sk_buff *, struct netlink_callback *);
492b558b
TG		 1889} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1890 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1891 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1892 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1893 .dump = xfrm_dump_sa },
1894 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1895 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1896 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1897 .dump = xfrm_dump_policy },
1898 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 1899 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 1900 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 1901 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1902 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 1903 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 1904 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1905 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 1906 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1907 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 1908 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 1909 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1da177e4
LT		 1910};
1911
1d00a4eb 1912static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4
LT		 1913{
1914 struct rtattr *xfrma[XFRMA_MAX];
1915 struct xfrm_link *link;
c702e804 1916 int type, min_len;
1da177e4 1917
1da177e4 1918 type = nlh->nlmsg_type;
1da177e4 1919 if (type > XFRM_MSG_MAX)
1d00a4eb 1920 return -EINVAL;
1da177e4
LT		 1921
1922 type -= XFRM_MSG_BASE;
1923 link = &xfrm_dispatch[type];
1924
1925 /* All operations require privileges, even GET */
1d00a4eb
TG		 1926 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1927 return -EPERM;
1da177e4 1928
492b558b
TG		 1929 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1930 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1931 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 1932 if (link->dump == NULL)
1d00a4eb 1933 return -EINVAL;
88fc2c84 1934
c702e804 1935 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
1da177e4
LT		 1936 }
1937
1938 memset(xfrma, 0, sizeof(xfrma));
1939
1940 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1d00a4eb 1941 return -EINVAL;
1da177e4
LT		 1942
1943 if (nlh->nlmsg_len > min_len) {
1944 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1945 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1946
1947 while (RTA_OK(attr, attrlen)) {
1948 unsigned short flavor = attr->rta_type;
1949 if (flavor) {
1950 if (flavor > XFRMA_MAX)
1d00a4eb 1951 return -EINVAL;
1da177e4
LT		 1952 xfrma[flavor - 1] = attr;
1953 }
1954 attr = RTA_NEXT(attr, attrlen);
1955 }
1956 }
1957
1958 if (link->doit == NULL)
1d00a4eb 1959 return -EINVAL;
1da177e4 1960
1d00a4eb 1961 return link->doit(skb, nlh, xfrma);
1da177e4
LT		 1962}
1963
1da177e4
LT		 1964static void xfrm_netlink_rcv(struct sock *sk, int len)
1965{
88fc2c84 1966 unsigned int qlen = 0;
2a0a6ebe 1967
1da177e4 1968 do {
4a3e2f71 1969 mutex_lock(&xfrm_cfg_mutex);
88fc2c84 1970 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
4a3e2f71 1971 mutex_unlock(&xfrm_cfg_mutex);
1da177e4 1972
2a0a6ebe 1973 } while (qlen);
1da177e4
LT		 1974}
1975
d51d081d 1976static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 1977{
1978 struct xfrm_user_expire *ue;
1979 struct nlmsghdr *nlh;
27a884dc 1980 unsigned char *b = skb_tail_pointer(skb);
1da177e4 1981
d51d081d 1982 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1da177e4
LT		 1983 sizeof(*ue));
1984 ue = NLMSG_DATA(nlh);
1985 nlh->nlmsg_flags = 0;
1986
1987 copy_to_user_state(x, &ue->state);
d51d081d 1988 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 1989
27a884dc 1990 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1da177e4
LT		 1991 return skb->len;
1992
1993nlmsg_failure:
dc5fc579 1994 nlmsg_trim(skb, b);
1da177e4
LT		 1995 return -1;
1996}
1997
26b15dad 1998static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 1999{
2000 struct sk_buff *skb;
ee57eef9 2001 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1da177e4 2002
ee57eef9 2003 skb = alloc_skb(len, GFP_ATOMIC);
1da177e4
LT		 2004 if (skb == NULL)
2005 return -ENOMEM;
2006
d51d081d 2007 if (build_expire(skb, x, c) < 0)
1da177e4
LT		 2008 BUG();
2009
ac6d439d
PM		 2010 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2011 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2012}
2013
d51d081d
JHS		 2014static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
2015{
2016 struct sk_buff *skb;
2017 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
2018
2019 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
2020 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
2021 skb = alloc_skb(len, GFP_ATOMIC);
2022 if (skb == NULL)
2023 return -ENOMEM;
2024
2025 if (build_aevent(skb, x, c) < 0)
2026 BUG();
2027
2028 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
2029 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2030}
2031
26b15dad
JHS		 2032static int xfrm_notify_sa_flush(struct km_event *c)
2033{
2034 struct xfrm_usersa_flush *p;
2035 struct nlmsghdr *nlh;
2036 struct sk_buff *skb;
27a884dc 2037 sk_buff_data_t b;
26b15dad
JHS		 2038 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
2039
2040 skb = alloc_skb(len, GFP_ATOMIC);
2041 if (skb == NULL)
2042 return -ENOMEM;
2043 b = skb->tail;
2044
2045 nlh = NLMSG_PUT(skb, c->pid, c->seq,
2046 XFRM_MSG_FLUSHSA, sizeof(*p));
2047 nlh->nlmsg_flags = 0;
2048
2049 p = NLMSG_DATA(nlh);
bf08867f 2050 p->proto = c->data.proto;
26b15dad
JHS		 2051
2052 nlh->nlmsg_len = skb->tail - b;
2053
ac6d439d
PM		 2054 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2055 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2056
2057nlmsg_failure:
2058 kfree_skb(skb);
2059 return -1;
2060}
2061
b6f99a21 2062static inline int xfrm_sa_len(struct xfrm_state *x)
26b15dad 2063{
0603eac0 2064 int l = 0;
26b15dad
JHS		 2065 if (x->aalg)
2066 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
2067 if (x->ealg)
2068 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
2069 if (x->calg)
2070 l += RTA_SPACE(sizeof(*x->calg));
2071 if (x->encap)
2072 l += RTA_SPACE(sizeof(*x->encap));
2073
2074 return l;
2075}
2076
2077static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
2078{
2079 struct xfrm_usersa_info *p;
0603eac0 2080 struct xfrm_usersa_id *id;
26b15dad
JHS		 2081 struct nlmsghdr *nlh;
2082 struct sk_buff *skb;
27a884dc 2083 sk_buff_data_t b;
26b15dad 2084 int len = xfrm_sa_len(x);
0603eac0
HX		 2085 int headlen;
2086
2087 headlen = sizeof(*p);
2088 if (c->event == XFRM_MSG_DELSA) {
2089 len += RTA_SPACE(headlen);
2090 headlen = sizeof(*id);
2091 }
2092 len += NLMSG_SPACE(headlen);
26b15dad
JHS		 2093
2094 skb = alloc_skb(len, GFP_ATOMIC);
2095 if (skb == NULL)
2096 return -ENOMEM;
2097 b = skb->tail;
2098
0603eac0 2099 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
26b15dad
JHS		 2100 nlh->nlmsg_flags = 0;
2101
2102 p = NLMSG_DATA(nlh);
0603eac0
HX		 2103 if (c->event == XFRM_MSG_DELSA) {
2104 id = NLMSG_DATA(nlh);
2105 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2106 id->spi = x->id.spi;
2107 id->family = x->props.family;
2108 id->proto = x->id.proto;
2109
2110 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
2111 }
2112
26b15dad
JHS		 2113 copy_to_user_state(x, p);
2114
2115 if (x->aalg)
2116 RTA_PUT(skb, XFRMA_ALG_AUTH,
2117 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
2118 if (x->ealg)
2119 RTA_PUT(skb, XFRMA_ALG_CRYPT,
2120 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
2121 if (x->calg)
2122 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
2123
2124 if (x->encap)
2125 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
2126
2127 nlh->nlmsg_len = skb->tail - b;
2128
ac6d439d
PM		 2129 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
2130 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2131
2132nlmsg_failure:
2133rtattr_failure:
2134 kfree_skb(skb);
2135 return -1;
2136}
2137
2138static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2139{
2140
2141 switch (c->event) {
f60f6b8f 2142 case XFRM_MSG_EXPIRE:
26b15dad 2143 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2144 case XFRM_MSG_NEWAE:
2145 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2146 case XFRM_MSG_DELSA:
2147 case XFRM_MSG_UPDSA:
2148 case XFRM_MSG_NEWSA:
26b15dad 2149 return xfrm_notify_sa(x, c);
f60f6b8f 2150 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2151 return xfrm_notify_sa_flush(c);
2152 default:
2153 printk("xfrm_user: Unknown SA event %d\n", c->event);
2154 break;
2155 }
2156
2157 return 0;
2158
2159}
2160
1da177e4
LT		 2161static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2162 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2163 int dir)
2164{
2165 struct xfrm_user_acquire *ua;
2166 struct nlmsghdr *nlh;
27a884dc 2167 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 2168 __u32 seq = xfrm_get_acqseq();
2169
2170 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
2171 sizeof(*ua));
2172 ua = NLMSG_DATA(nlh);
2173 nlh->nlmsg_flags = 0;
2174
2175 memcpy(&ua->id, &x->id, sizeof(ua->id));
2176 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2177 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2178 copy_to_user_policy(xp, &ua->policy, dir);
2179 ua->aalgos = xt->aalgos;
2180 ua->ealgos = xt->ealgos;
2181 ua->calgos = xt->calgos;
2182 ua->seq = x->km.seq = seq;
2183
2184 if (copy_to_user_tmpl(xp, skb) < 0)
2185 goto nlmsg_failure;
0d681623 2186 if (copy_to_user_state_sec_ctx(x, skb))
df71837d 2187 goto nlmsg_failure;
1459bb36 2188 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2189 goto nlmsg_failure;
1da177e4 2190
27a884dc 2191 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1da177e4
LT		 2192 return skb->len;
2193
2194nlmsg_failure:
dc5fc579 2195 nlmsg_trim(skb, b);
1da177e4
LT		 2196 return -1;
2197}
2198
2199static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2200 struct xfrm_policy *xp, int dir)
2201{
2202 struct sk_buff *skb;
2203 size_t len;
2204
2205 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2206 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
661697f7 2207 len += RTA_SPACE(xfrm_user_sec_ctx_size(x->security));
785fd8b8
JHS		 2208#ifdef CONFIG_XFRM_SUB_POLICY
2209 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2210#endif
1da177e4
LT		 2211 skb = alloc_skb(len, GFP_ATOMIC);
2212 if (skb == NULL)
2213 return -ENOMEM;
2214
2215 if (build_acquire(skb, x, xt, xp, dir) < 0)
2216 BUG();
2217
ac6d439d
PM		 2218 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
2219 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2220}
2221
2222/* User gives us xfrm_user_policy_info followed by an array of 0
2223 * or more templates.
2224 */
cb969f07 2225static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2226 u8 *data, int len, int *dir)
2227{
2228 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2229 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2230 struct xfrm_policy *xp;
2231 int nr;
2232
cb969f07 2233 switch (sk->sk_family) {
1da177e4
LT		 2234 case AF_INET:
2235 if (opt != IP_XFRM_POLICY) {
2236 *dir = -EOPNOTSUPP;
2237 return NULL;
2238 }
2239 break;
2240#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2241 case AF_INET6:
2242 if (opt != IPV6_XFRM_POLICY) {
2243 *dir = -EOPNOTSUPP;
2244 return NULL;
2245 }
2246 break;
2247#endif
2248 default:
2249 *dir = -EINVAL;
2250 return NULL;
2251 }
2252
2253 *dir = -EINVAL;
2254
2255 if (len < sizeof(*p) ||
2256 verify_newpolicy_info(p))
2257 return NULL;
2258
2259 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2260 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2261 return NULL;
2262
a4f1bac6
HX		 2263 if (p->dir > XFRM_POLICY_OUT)
2264 return NULL;
2265
1da177e4
LT		 2266 xp = xfrm_policy_alloc(GFP_KERNEL);
2267 if (xp == NULL) {
2268 *dir = -ENOBUFS;
2269 return NULL;
2270 }
2271
2272 copy_from_user_policy(xp, p);
f7b6983f 2273 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2274 copy_templates(xp, ut, nr);
2275
2276 *dir = p->dir;
2277
2278 return xp;
2279}
2280
2281static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
d51d081d 2282 int dir, struct km_event *c)
1da177e4
LT		 2283{
2284 struct xfrm_user_polexpire *upe;
2285 struct nlmsghdr *nlh;
d51d081d 2286 int hard = c->data.hard;
27a884dc 2287 unsigned char *b = skb_tail_pointer(skb);
1da177e4 2288
d51d081d 2289 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1da177e4
LT		 2290 upe = NLMSG_DATA(nlh);
2291 nlh->nlmsg_flags = 0;
2292
2293 copy_to_user_policy(xp, &upe->pol, dir);
2294 if (copy_to_user_tmpl(xp, skb) < 0)
2295 goto nlmsg_failure;
df71837d
TJ		 2296 if (copy_to_user_sec_ctx(xp, skb))
2297 goto nlmsg_failure;
1459bb36 2298 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2299 goto nlmsg_failure;
1da177e4
LT		 2300 upe->hard = !!hard;
2301
27a884dc 2302 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1da177e4
LT		 2303 return skb->len;
2304
2305nlmsg_failure:
dc5fc579 2306 nlmsg_trim(skb, b);
1da177e4
LT		 2307 return -1;
2308}
2309
26b15dad 2310static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1da177e4
LT		 2311{
2312 struct sk_buff *skb;
2313 size_t len;
2314
2315 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2316 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
661697f7 2317 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp->security));
785fd8b8
JHS		 2318#ifdef CONFIG_XFRM_SUB_POLICY
2319 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2320#endif
1da177e4
LT		 2321 skb = alloc_skb(len, GFP_ATOMIC);
2322 if (skb == NULL)
2323 return -ENOMEM;
2324
d51d081d 2325 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2326 BUG();
2327
ac6d439d
PM		 2328 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2329 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2330}
2331
26b15dad
JHS		 2332static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2333{
2334 struct xfrm_userpolicy_info *p;
0603eac0 2335 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2336 struct nlmsghdr *nlh;
2337 struct sk_buff *skb;
27a884dc 2338 sk_buff_data_t b;
26b15dad 2339 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
0603eac0
HX		 2340 int headlen;
2341
2342 headlen = sizeof(*p);
2343 if (c->event == XFRM_MSG_DELPOLICY) {
2344 len += RTA_SPACE(headlen);
2345 headlen = sizeof(*id);
2346 }
334f3d45
JHS		 2347#ifdef CONFIG_XFRM_SUB_POLICY
2348 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2349#endif
0603eac0 2350 len += NLMSG_SPACE(headlen);
26b15dad
JHS		 2351
2352 skb = alloc_skb(len, GFP_ATOMIC);
2353 if (skb == NULL)
2354 return -ENOMEM;
2355 b = skb->tail;
2356
0603eac0 2357 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
26b15dad
JHS		 2358
2359 p = NLMSG_DATA(nlh);
0603eac0
HX		 2360 if (c->event == XFRM_MSG_DELPOLICY) {
2361 id = NLMSG_DATA(nlh);
2362 memset(id, 0, sizeof(*id));
2363 id->dir = dir;
2364 if (c->data.byid)
2365 id->index = xp->index;
2366 else
2367 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2368
2369 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2370 }
26b15dad
JHS		 2371
2372 nlh->nlmsg_flags = 0;
2373
2374 copy_to_user_policy(xp, p, dir);
2375 if (copy_to_user_tmpl(xp, skb) < 0)
2376 goto nlmsg_failure;
1459bb36 2377 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2378 goto nlmsg_failure;
26b15dad
JHS		 2379
2380 nlh->nlmsg_len = skb->tail - b;
2381
ac6d439d
PM		 2382 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2383 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 2384
2385nlmsg_failure:
0603eac0 2386rtattr_failure:
26b15dad
JHS		 2387 kfree_skb(skb);
2388 return -1;
2389}
2390
2391static int xfrm_notify_policy_flush(struct km_event *c)
2392{
2393 struct nlmsghdr *nlh;
2394 struct sk_buff *skb;
27a884dc 2395 sk_buff_data_t b;
785fd8b8 2396 int len = 0;
f7b6983f 2397#ifdef CONFIG_XFRM_SUB_POLICY
785fd8b8 2398 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
f7b6983f 2399#endif
785fd8b8 2400 len += NLMSG_LENGTH(0);
26b15dad
JHS		 2401
2402 skb = alloc_skb(len, GFP_ATOMIC);
2403 if (skb == NULL)
2404 return -ENOMEM;
2405 b = skb->tail;
2406
2407
2408 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
f7b6983f 2409 nlh->nlmsg_flags = 0;
0c51f53c
JHS		 2410 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2411 goto nlmsg_failure;
26b15dad
JHS		 2412
2413 nlh->nlmsg_len = skb->tail - b;
2414
ac6d439d
PM		 2415 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2416 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 2417
2418nlmsg_failure:
2419 kfree_skb(skb);
2420 return -1;
2421}
2422
2423static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2424{
2425
2426 switch (c->event) {
f60f6b8f
HX		 2427 case XFRM_MSG_NEWPOLICY:
2428 case XFRM_MSG_UPDPOLICY:
2429 case XFRM_MSG_DELPOLICY:
26b15dad 2430 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2431 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2432 return xfrm_notify_policy_flush(c);
f60f6b8f 2433 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2434 return xfrm_exp_policy_notify(xp, dir, c);
2435 default:
2436 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2437 }
2438
2439 return 0;
2440
2441}
2442
97a64b45
MN		 2443static int build_report(struct sk_buff *skb, u8 proto,
2444 struct xfrm_selector *sel, xfrm_address_t *addr)
2445{
2446 struct xfrm_user_report *ur;
2447 struct nlmsghdr *nlh;
27a884dc 2448 unsigned char *b = skb_tail_pointer(skb);
97a64b45
MN		 2449
2450 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2451 ur = NLMSG_DATA(nlh);
2452 nlh->nlmsg_flags = 0;
2453
2454 ur->proto = proto;
2455 memcpy(&ur->sel, sel, sizeof(ur->sel));
2456
2457 if (addr)
2458 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2459
27a884dc 2460 nlh->nlmsg_len = skb_tail_pointer(skb) - b;
97a64b45
MN		 2461 return skb->len;
2462
2463nlmsg_failure:
2464rtattr_failure:
dc5fc579 2465 nlmsg_trim(skb, b);
97a64b45
MN		 2466 return -1;
2467}
2468
2469static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2470 xfrm_address_t *addr)
2471{
2472 struct sk_buff *skb;
2473 size_t len;
2474
2475 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2476 skb = alloc_skb(len, GFP_ATOMIC);
2477 if (skb == NULL)
2478 return -ENOMEM;
2479
2480 if (build_report(skb, proto, sel, addr) < 0)
2481 BUG();
2482
2483 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2484 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2485}
2486
1da177e4
LT		 2487static struct xfrm_mgr netlink_mgr = {
2488 .id = "netlink",
2489 .notify = xfrm_send_state_notify,
2490 .acquire = xfrm_send_acquire,
2491 .compile_policy = xfrm_compile_policy,
2492 .notify_policy = xfrm_send_policy_notify,
97a64b45 2493 .report = xfrm_send_report,
5c79de6e 2494 .migrate = xfrm_send_migrate,
1da177e4
LT		 2495};
2496
2497static int __init xfrm_user_init(void)
2498{
be33690d
PM		 2499 struct sock *nlsk;
2500
654b32c6 2501 printk(KERN_INFO "Initializing XFRM netlink socket\n");
1da177e4 2502
be33690d 2503 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
af65bdfc 2504 xfrm_netlink_rcv, NULL, THIS_MODULE);
be33690d 2505 if (nlsk == NULL)
1da177e4 2506 return -ENOMEM;
be33690d 2507 rcu_assign_pointer(xfrm_nl, nlsk);
1da177e4
LT		 2508
2509 xfrm_register_km(&netlink_mgr);
2510
2511 return 0;
2512}
2513
2514static void __exit xfrm_user_exit(void)
2515{
be33690d
PM		 2516 struct sock *nlsk = xfrm_nl;
2517
1da177e4 2518 xfrm_unregister_km(&netlink_mgr);
be33690d
PM		 2519 rcu_assign_pointer(xfrm_nl, NULL);
2520 synchronize_rcu();
2521 sock_release(nlsk->sk_socket);
1da177e4
LT		 2522}
2523
2524module_init(xfrm_user_init);
2525module_exit(xfrm_user_exit);
2526MODULE_LICENSE("GPL");
4fdb3bb7 2527MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 2528
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