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[XFRM]: Extension for dynamic update of endpoint address(es)
[mirror_ubuntu-artful-kernel.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
HX		 50
51 len -= (algp->alg_key_len + 7U) / 8;
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;
74 };
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;
155 };
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;
195 };
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;
220 };
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
TJ		 274
275static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp)
276{
277 struct xfrm_sec_ctx *xfrm_ctx = xp->security;
278 int len = 0;
279
280 if (xfrm_ctx) {
281 len += sizeof(struct xfrm_user_sec_ctx);
282 len += xfrm_ctx->ctx_len;
283 }
284 return len;
285}
286
287static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
288{
289 struct xfrm_user_sec_ctx *uctx;
290
291 if (!u_arg)
292 return 0;
293
294 uctx = RTA_DATA(u_arg);
295 return security_xfrm_state_alloc(x, uctx);
296}
297
060f02a3
NT		 298static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
299{
300 struct rtattr *rta = u_arg;
301 xfrm_address_t *p, *uaddrp;
302
303 if (!rta)
304 return 0;
305
306 uaddrp = RTA_DATA(rta);
cdbc6dae 307 p = kmemdup(uaddrp, sizeof(*p), GFP_KERNEL);
060f02a3
NT		 308 if (!p)
309 return -ENOMEM;
310
060f02a3
NT		 311 *addrpp = p;
312 return 0;
313}
314
1da177e4
LT		 315static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
316{
317 memcpy(&x->id, &p->id, sizeof(x->id));
318 memcpy(&x->sel, &p->sel, sizeof(x->sel));
319 memcpy(&x->lft, &p->lft, sizeof(x->lft));
320 x->props.mode = p->mode;
321 x->props.replay_window = p->replay_window;
322 x->props.reqid = p->reqid;
323 x->props.family = p->family;
54489c14 324 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4
LT		 325 x->props.flags = p->flags;
326}
327
d51d081d
JHS		 328/*
329 * someday when pfkey also has support, we could have the code
330 * somehow made shareable and move it to xfrm_state.c - JHS
331 *
332*/
333static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
334{
335 int err = - EINVAL;
336 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
337 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
338 struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
339 struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
340
341 if (rp) {
342 struct xfrm_replay_state *replay;
343 if (RTA_PAYLOAD(rp) < sizeof(*replay))
344 goto error;
345 replay = RTA_DATA(rp);
346 memcpy(&x->replay, replay, sizeof(*replay));
347 memcpy(&x->preplay, replay, sizeof(*replay));
348 }
349
350 if (lt) {
351 struct xfrm_lifetime_cur *ltime;
352 if (RTA_PAYLOAD(lt) < sizeof(*ltime))
353 goto error;
354 ltime = RTA_DATA(lt);
355 x->curlft.bytes = ltime->bytes;
356 x->curlft.packets = ltime->packets;
357 x->curlft.add_time = ltime->add_time;
358 x->curlft.use_time = ltime->use_time;
359 }
360
361 if (et) {
362 if (RTA_PAYLOAD(et) < sizeof(u32))
363 goto error;
364 x->replay_maxage = *(u32*)RTA_DATA(et);
365 }
366
367 if (rt) {
368 if (RTA_PAYLOAD(rt) < sizeof(u32))
369 goto error;
370 x->replay_maxdiff = *(u32*)RTA_DATA(rt);
371 }
372
373 return 0;
374error:
375 return err;
376}
377
1da177e4
LT		 378static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
379 struct rtattr **xfrma,
380 int *errp)
381{
382 struct xfrm_state *x = xfrm_state_alloc();
383 int err = -ENOMEM;
384
385 if (!x)
386 goto error_no_put;
387
388 copy_from_user_state(x, p);
389
390 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
391 xfrm_aalg_get_byname,
392 xfrma[XFRMA_ALG_AUTH-1])))
393 goto error;
394 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
395 xfrm_ealg_get_byname,
396 xfrma[XFRMA_ALG_CRYPT-1])))
397 goto error;
398 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
399 xfrm_calg_get_byname,
400 xfrma[XFRMA_ALG_COMP-1])))
401 goto error;
402 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
403 goto error;
060f02a3
NT		 404 if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
405 goto error;
72cb6962 406 err = xfrm_init_state(x);
1da177e4
LT		 407 if (err)
408 goto error;
409
df71837d
TJ		 410 if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
411 goto error;
412
1da177e4 413 x->km.seq = p->seq;
d51d081d
JHS		 414 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
415 /* sysctl_xfrm_aevent_etime is in 100ms units */
416 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
417 x->preplay.bitmap = 0;
418 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
419 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
420
421 /* override default values from above */
422
423 err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
424 if (err < 0)
425 goto error;
1da177e4
LT		 426
427 return x;
428
429error:
430 x->km.state = XFRM_STATE_DEAD;
431 xfrm_state_put(x);
432error_no_put:
433 *errp = err;
434 return NULL;
435}
436
22e70050
CH		 437static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
438 struct rtattr **xfrma)
1da177e4
LT		 439{
440 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
441 struct xfrm_state *x;
442 int err;
26b15dad 443 struct km_event c;
1da177e4 444
22e70050 445 err = verify_newsa_info(p, xfrma);
1da177e4
LT		 446 if (err)
447 return err;
448
22e70050 449 x = xfrm_state_construct(p, xfrma, &err);
1da177e4
LT		 450 if (!x)
451 return err;
452
26b15dad 453 xfrm_state_hold(x);
1da177e4
LT		 454 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
455 err = xfrm_state_add(x);
456 else
457 err = xfrm_state_update(x);
458
161a09e7
JL		 459 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
460 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
461
1da177e4
LT		 462 if (err < 0) {
463 x->km.state = XFRM_STATE_DEAD;
21380b81 464 __xfrm_state_put(x);
7d6dfe1f 465 goto out;
1da177e4
LT		 466 }
467
26b15dad
JHS		 468 c.seq = nlh->nlmsg_seq;
469 c.pid = nlh->nlmsg_pid;
f60f6b8f 470 c.event = nlh->nlmsg_type;
26b15dad
JHS		 471
472 km_state_notify(x, &c);
7d6dfe1f 473out:
26b15dad 474 xfrm_state_put(x);
1da177e4
LT		 475 return err;
476}
477
eb2971b6
MN		 478static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
479 struct rtattr **xfrma,
480 int *errp)
481{
482 struct xfrm_state *x = NULL;
483 int err;
484
485 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
486 err = -ESRCH;
487 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
488 } else {
489 xfrm_address_t *saddr = NULL;
490
491 err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
492 if (err)
493 goto out;
494
495 if (!saddr) {
496 err = -EINVAL;
497 goto out;
498 }
499
9abbffee 500 err = -ESRCH;
eb2971b6
MN		 501 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
502 p->family);
503 }
504
505 out:
506 if (!x && errp)
507 *errp = err;
508 return x;
509}
510
22e70050
CH		 511static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
512 struct rtattr **xfrma)
1da177e4
LT		 513{
514 struct xfrm_state *x;
eb2971b6 515 int err = -ESRCH;
26b15dad 516 struct km_event c;
1da177e4
LT		 517 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
518
22e70050 519 x = xfrm_user_state_lookup(p, xfrma, &err);
1da177e4 520 if (x == NULL)
eb2971b6 521 return err;
1da177e4 522
6f68dc37 523 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 524 goto out;
525
1da177e4 526 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 527 err = -EPERM;
528 goto out;
1da177e4
LT		 529 }
530
26b15dad 531 err = xfrm_state_delete(x);
161a09e7
JL		 532
533 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
534 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
535
c8c05a8e
CZ		 536 if (err < 0)
537 goto out;
26b15dad
JHS		 538
539 c.seq = nlh->nlmsg_seq;
540 c.pid = nlh->nlmsg_pid;
f60f6b8f 541 c.event = nlh->nlmsg_type;
26b15dad 542 km_state_notify(x, &c);
1da177e4 543
c8c05a8e
CZ		 544out:
545 xfrm_state_put(x);
26b15dad 546 return err;
1da177e4
LT		 547}
548
549static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
550{
551 memcpy(&p->id, &x->id, sizeof(p->id));
552 memcpy(&p->sel, &x->sel, sizeof(p->sel));
553 memcpy(&p->lft, &x->lft, sizeof(p->lft));
554 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
555 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 556 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 557 p->mode = x->props.mode;
558 p->replay_window = x->props.replay_window;
559 p->reqid = x->props.reqid;
560 p->family = x->props.family;
561 p->flags = x->props.flags;
562 p->seq = x->km.seq;
563}
564
565struct xfrm_dump_info {
566 struct sk_buff *in_skb;
567 struct sk_buff *out_skb;
568 u32 nlmsg_seq;
569 u16 nlmsg_flags;
570 int start_idx;
571 int this_idx;
572};
573
574static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
575{
576 struct xfrm_dump_info *sp = ptr;
577 struct sk_buff *in_skb = sp->in_skb;
578 struct sk_buff *skb = sp->out_skb;
579 struct xfrm_usersa_info *p;
580 struct nlmsghdr *nlh;
581 unsigned char *b = skb->tail;
582
583 if (sp->this_idx < sp->start_idx)
584 goto out;
585
586 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
587 sp->nlmsg_seq,
588 XFRM_MSG_NEWSA, sizeof(*p));
589 nlh->nlmsg_flags = sp->nlmsg_flags;
590
591 p = NLMSG_DATA(nlh);
592 copy_to_user_state(x, p);
593
594 if (x->aalg)
595 RTA_PUT(skb, XFRMA_ALG_AUTH,
596 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
597 if (x->ealg)
598 RTA_PUT(skb, XFRMA_ALG_CRYPT,
599 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
600 if (x->calg)
601 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
602
603 if (x->encap)
604 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
605
df71837d
TJ		 606 if (x->security) {
607 int ctx_size = sizeof(struct xfrm_sec_ctx) +
608 x->security->ctx_len;
609 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
610 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
611
612 uctx->exttype = XFRMA_SEC_CTX;
613 uctx->len = ctx_size;
614 uctx->ctx_doi = x->security->ctx_doi;
615 uctx->ctx_alg = x->security->ctx_alg;
616 uctx->ctx_len = x->security->ctx_len;
617 memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
618 }
060f02a3
NT		 619
620 if (x->coaddr)
621 RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
622
9afaca05
MN		 623 if (x->lastused)
624 RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);
625
1da177e4
LT		 626 nlh->nlmsg_len = skb->tail - b;
627out:
628 sp->this_idx++;
629 return 0;
630
631nlmsg_failure:
632rtattr_failure:
633 skb_trim(skb, b - skb->data);
634 return -1;
635}
636
637static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
638{
639 struct xfrm_dump_info info;
640
641 info.in_skb = cb->skb;
642 info.out_skb = skb;
643 info.nlmsg_seq = cb->nlh->nlmsg_seq;
644 info.nlmsg_flags = NLM_F_MULTI;
645 info.this_idx = 0;
646 info.start_idx = cb->args[0];
dc00a525 647 (void) xfrm_state_walk(0, dump_one_state, &info);
1da177e4
LT		 648 cb->args[0] = info.this_idx;
649
650 return skb->len;
651}
652
653static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
654 struct xfrm_state *x, u32 seq)
655{
656 struct xfrm_dump_info info;
657 struct sk_buff *skb;
658
659 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
660 if (!skb)
661 return ERR_PTR(-ENOMEM);
662
1da177e4
LT		 663 info.in_skb = in_skb;
664 info.out_skb = skb;
665 info.nlmsg_seq = seq;
666 info.nlmsg_flags = 0;
667 info.this_idx = info.start_idx = 0;
668
669 if (dump_one_state(x, 0, &info)) {
670 kfree_skb(skb);
671 return NULL;
672 }
673
674 return skb;
675}
676
22e70050
CH		 677static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
678 struct rtattr **xfrma)
1da177e4
LT		 679{
680 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
681 struct xfrm_state *x;
682 struct sk_buff *resp_skb;
eb2971b6 683 int err = -ESRCH;
1da177e4 684
22e70050 685 x = xfrm_user_state_lookup(p, xfrma, &err);
1da177e4
LT		 686 if (x == NULL)
687 goto out_noput;
688
689 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
690 if (IS_ERR(resp_skb)) {
691 err = PTR_ERR(resp_skb);
692 } else {
693 err = netlink_unicast(xfrm_nl, resp_skb,
694 NETLINK_CB(skb).pid, MSG_DONTWAIT);
695 }
696 xfrm_state_put(x);
697out_noput:
698 return err;
699}
700
701static int verify_userspi_info(struct xfrm_userspi_info *p)
702{
703 switch (p->info.id.proto) {
704 case IPPROTO_AH:
705 case IPPROTO_ESP:
706 break;
707
708 case IPPROTO_COMP:
709 /* IPCOMP spi is 16-bits. */
710 if (p->max >= 0x10000)
711 return -EINVAL;
712 break;
713
714 default:
715 return -EINVAL;
716 };
717
718 if (p->min > p->max)
719 return -EINVAL;
720
721 return 0;
722}
723
22e70050
CH		 724static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
725 struct rtattr **xfrma)
1da177e4
LT		 726{
727 struct xfrm_state *x;
728 struct xfrm_userspi_info *p;
729 struct sk_buff *resp_skb;
730 xfrm_address_t *daddr;
731 int family;
732 int err;
733
734 p = NLMSG_DATA(nlh);
735 err = verify_userspi_info(p);
736 if (err)
737 goto out_noput;
738
739 family = p->info.family;
740 daddr = &p->info.id.daddr;
741
742 x = NULL;
743 if (p->info.seq) {
744 x = xfrm_find_acq_byseq(p->info.seq);
745 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
746 xfrm_state_put(x);
747 x = NULL;
748 }
749 }
750
751 if (!x)
752 x = xfrm_find_acq(p->info.mode, p->info.reqid,
753 p->info.id.proto, daddr,
754 &p->info.saddr, 1,
755 family);
756 err = -ENOENT;
757 if (x == NULL)
758 goto out_noput;
759
760 resp_skb = ERR_PTR(-ENOENT);
761
762 spin_lock_bh(&x->lock);
763 if (x->km.state != XFRM_STATE_DEAD) {
764 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
765 if (x->id.spi)
766 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
767 }
768 spin_unlock_bh(&x->lock);
769
770 if (IS_ERR(resp_skb)) {
771 err = PTR_ERR(resp_skb);
772 goto out;
773 }
774
775 err = netlink_unicast(xfrm_nl, resp_skb,
776 NETLINK_CB(skb).pid, MSG_DONTWAIT);
777
778out:
779 xfrm_state_put(x);
780out_noput:
781 return err;
782}
783
b798a9ed 784static int verify_policy_dir(u8 dir)
1da177e4
LT		 785{
786 switch (dir) {
787 case XFRM_POLICY_IN:
788 case XFRM_POLICY_OUT:
789 case XFRM_POLICY_FWD:
790 break;
791
792 default:
793 return -EINVAL;
794 };
795
796 return 0;
797}
798
b798a9ed 799static int verify_policy_type(u8 type)
f7b6983f
MN		 800{
801 switch (type) {
802 case XFRM_POLICY_TYPE_MAIN:
803#ifdef CONFIG_XFRM_SUB_POLICY
804 case XFRM_POLICY_TYPE_SUB:
805#endif
806 break;
807
808 default:
809 return -EINVAL;
810 };
811
812 return 0;
813}
814
1da177e4
LT		 815static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
816{
817 switch (p->share) {
818 case XFRM_SHARE_ANY:
819 case XFRM_SHARE_SESSION:
820 case XFRM_SHARE_USER:
821 case XFRM_SHARE_UNIQUE:
822 break;
823
824 default:
825 return -EINVAL;
826 };
827
828 switch (p->action) {
829 case XFRM_POLICY_ALLOW:
830 case XFRM_POLICY_BLOCK:
831 break;
832
833 default:
834 return -EINVAL;
835 };
836
837 switch (p->sel.family) {
838 case AF_INET:
839 break;
840
841 case AF_INET6:
842#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
843 break;
844#else
845 return -EAFNOSUPPORT;
846#endif
847
848 default:
849 return -EINVAL;
850 };
851
852 return verify_policy_dir(p->dir);
853}
854
df71837d
TJ		 855static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
856{
857 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
858 struct xfrm_user_sec_ctx *uctx;
859
860 if (!rt)
861 return 0;
862
863 uctx = RTA_DATA(rt);
864 return security_xfrm_policy_alloc(pol, uctx);
865}
866
1da177e4
LT		 867static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
868 int nr)
869{
870 int i;
871
872 xp->xfrm_nr = nr;
873 for (i = 0; i < nr; i++, ut++) {
874 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
875
876 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
877 memcpy(&t->saddr, &ut->saddr,
878 sizeof(xfrm_address_t));
879 t->reqid = ut->reqid;
880 t->mode = ut->mode;
881 t->share = ut->share;
882 t->optional = ut->optional;
883 t->aalgos = ut->aalgos;
884 t->ealgos = ut->ealgos;
885 t->calgos = ut->calgos;
8511d01d 886 t->encap_family = ut->family;
1da177e4
LT		 887 }
888}
889
b4ad86bf
DM		 890static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
891{
892 int i;
893
894 if (nr > XFRM_MAX_DEPTH)
895 return -EINVAL;
896
897 for (i = 0; i < nr; i++) {
898 /* We never validated the ut->family value, so many
899 * applications simply leave it at zero. The check was
900 * never made and ut->family was ignored because all
901 * templates could be assumed to have the same family as
902 * the policy itself. Now that we will have ipv4-in-ipv6
903 * and ipv6-in-ipv4 tunnels, this is no longer true.
904 */
905 if (!ut[i].family)
906 ut[i].family = family;
907
908 switch (ut[i].family) {
909 case AF_INET:
910 break;
911#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
912 case AF_INET6:
913 break;
914#endif
915 default:
916 return -EINVAL;
917 };
918 }
919
920 return 0;
921}
922
1da177e4
LT		 923static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
924{
925 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1da177e4
LT		 926
927 if (!rt) {
928 pol->xfrm_nr = 0;
929 } else {
b4ad86bf
DM		 930 struct xfrm_user_tmpl *utmpl = RTA_DATA(rt);
931 int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
932 int err;
1da177e4 933
b4ad86bf
DM		 934 err = validate_tmpl(nr, utmpl, pol->family);
935 if (err)
936 return err;
1da177e4
LT		 937
938 copy_templates(pol, RTA_DATA(rt), nr);
939 }
940 return 0;
941}
942
f7b6983f
MN		 943static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
944{
945 struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
946 struct xfrm_userpolicy_type *upt;
b798a9ed 947 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 948 int err;
949
950 if (rt) {
951 if (rt->rta_len < sizeof(*upt))
952 return -EINVAL;
953
954 upt = RTA_DATA(rt);
955 type = upt->type;
956 }
957
958 err = verify_policy_type(type);
959 if (err)
960 return err;
961
962 *tp = type;
963 return 0;
964}
965
1da177e4
LT		 966static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
967{
968 xp->priority = p->priority;
969 xp->index = p->index;
970 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
971 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
972 xp->action = p->action;
973 xp->flags = p->flags;
974 xp->family = p->sel.family;
975 /* XXX xp->share = p->share; */
976}
977
978static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
979{
980 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
981 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
982 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
983 p->priority = xp->priority;
984 p->index = xp->index;
985 p->sel.family = xp->family;
986 p->dir = dir;
987 p->action = xp->action;
988 p->flags = xp->flags;
989 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
990}
991
992static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
993{
994 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
995 int err;
996
997 if (!xp) {
998 *errp = -ENOMEM;
999 return NULL;
1000 }
1001
1002 copy_from_user_policy(xp, p);
df71837d 1003
f7b6983f
MN		 1004 err = copy_from_user_policy_type(&xp->type, xfrma);
1005 if (err)
1006 goto error;
1007
df71837d
TJ		 1008 if (!(err = copy_from_user_tmpl(xp, xfrma)))
1009 err = copy_from_user_sec_ctx(xp, xfrma);
f7b6983f
MN		 1010 if (err)
1011 goto error;
1da177e4
LT		 1012
1013 return xp;
f7b6983f
MN		 1014 error:
1015 *errp = err;
1016 kfree(xp);
1017 return NULL;
1da177e4
LT		 1018}
1019
22e70050
CH		 1020static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1021 struct rtattr **xfrma)
1da177e4
LT		 1022{
1023 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
1024 struct xfrm_policy *xp;
26b15dad 1025 struct km_event c;
1da177e4
LT		 1026 int err;
1027 int excl;
1028
1029 err = verify_newpolicy_info(p);
df71837d
TJ		 1030 if (err)
1031 return err;
22e70050 1032 err = verify_sec_ctx_len(xfrma);
1da177e4
LT		 1033 if (err)
1034 return err;
1035
22e70050 1036 xp = xfrm_policy_construct(p, xfrma, &err);
1da177e4
LT		 1037 if (!xp)
1038 return err;
1039
26b15dad
JHS		 1040 /* shouldnt excl be based on nlh flags??
1041 * Aha! this is anti-netlink really i.e more pfkey derived
1042 * in netlink excl is a flag and you wouldnt need
1043 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1044 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1045 err = xfrm_policy_insert(p->dir, xp, excl);
161a09e7
JL		 1046 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1047 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1048
1da177e4 1049 if (err) {
5f8ac64b 1050 security_xfrm_policy_free(xp);
1da177e4
LT		 1051 kfree(xp);
1052 return err;
1053 }
1054
f60f6b8f 1055 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1056 c.seq = nlh->nlmsg_seq;
1057 c.pid = nlh->nlmsg_pid;
1058 km_policy_notify(xp, p->dir, &c);
1059
1da177e4
LT		 1060 xfrm_pol_put(xp);
1061
1062 return 0;
1063}
1064
1065static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1066{
1067 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1068 int i;
1069
1070 if (xp->xfrm_nr == 0)
1071 return 0;
1072
1073 for (i = 0; i < xp->xfrm_nr; i++) {
1074 struct xfrm_user_tmpl *up = &vec[i];
1075 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1076
1077 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1078 up->family = kp->encap_family;
1da177e4
LT		 1079 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1080 up->reqid = kp->reqid;
1081 up->mode = kp->mode;
1082 up->share = kp->share;
1083 up->optional = kp->optional;
1084 up->aalgos = kp->aalgos;
1085 up->ealgos = kp->ealgos;
1086 up->calgos = kp->calgos;
1087 }
1088 RTA_PUT(skb, XFRMA_TMPL,
1089 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
1090 vec);
1091
1092 return 0;
1093
1094rtattr_failure:
1095 return -1;
1096}
1097
0d681623 1098static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
df71837d 1099{
0d681623
SH		 1100 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
1101 struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
1102 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1103
1104 uctx->exttype = XFRMA_SEC_CTX;
1105 uctx->len = ctx_size;
1106 uctx->ctx_doi = s->ctx_doi;
1107 uctx->ctx_alg = s->ctx_alg;
1108 uctx->ctx_len = s->ctx_len;
1109 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1110 return 0;
df71837d 1111
0d681623
SH		 1112 rtattr_failure:
1113 return -1;
1114}
1115
1116static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1117{
1118 if (x->security) {
1119 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1120 }
1121 return 0;
0d681623 1122}
df71837d 1123
0d681623
SH		 1124static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1125{
1126 if (xp->security) {
1127 return copy_sec_ctx(xp->security, skb);
1128 }
1129 return 0;
df71837d
TJ		 1130}
1131
f7b6983f 1132#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1133static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1134{
1135 struct xfrm_userpolicy_type upt;
1136
1137 memset(&upt, 0, sizeof(upt));
1459bb36 1138 upt.type = type;
f7b6983f
MN		 1139
1140 RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1141
1142 return 0;
1143
1144rtattr_failure:
1145 return -1;
1146}
1147
1148#else
b798a9ed 1149static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1150{
1151 return 0;
1152}
1153#endif
1154
1da177e4
LT		 1155static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1156{
1157 struct xfrm_dump_info *sp = ptr;
1158 struct xfrm_userpolicy_info *p;
1159 struct sk_buff *in_skb = sp->in_skb;
1160 struct sk_buff *skb = sp->out_skb;
1161 struct nlmsghdr *nlh;
1162 unsigned char *b = skb->tail;
1163
1164 if (sp->this_idx < sp->start_idx)
1165 goto out;
1166
1167 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
1168 sp->nlmsg_seq,
1169 XFRM_MSG_NEWPOLICY, sizeof(*p));
1170 p = NLMSG_DATA(nlh);
1171 nlh->nlmsg_flags = sp->nlmsg_flags;
1172
1173 copy_to_user_policy(xp, p, dir);
1174 if (copy_to_user_tmpl(xp, skb) < 0)
1175 goto nlmsg_failure;
df71837d
TJ		 1176 if (copy_to_user_sec_ctx(xp, skb))
1177 goto nlmsg_failure;
1459bb36 1178 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 1179 goto nlmsg_failure;
1da177e4
LT		 1180
1181 nlh->nlmsg_len = skb->tail - b;
1182out:
1183 sp->this_idx++;
1184 return 0;
1185
1186nlmsg_failure:
1187 skb_trim(skb, b - skb->data);
1188 return -1;
1189}
1190
1191static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1192{
1193 struct xfrm_dump_info info;
1194
1195 info.in_skb = cb->skb;
1196 info.out_skb = skb;
1197 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1198 info.nlmsg_flags = NLM_F_MULTI;
1199 info.this_idx = 0;
1200 info.start_idx = cb->args[0];
f7b6983f
MN		 1201 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1202#ifdef CONFIG_XFRM_SUB_POLICY
1203 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1204#endif
1da177e4
LT		 1205 cb->args[0] = info.this_idx;
1206
1207 return skb->len;
1208}
1209
1210static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1211 struct xfrm_policy *xp,
1212 int dir, u32 seq)
1213{
1214 struct xfrm_dump_info info;
1215 struct sk_buff *skb;
1216
1217 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1218 if (!skb)
1219 return ERR_PTR(-ENOMEM);
1220
1da177e4
LT		 1221 info.in_skb = in_skb;
1222 info.out_skb = skb;
1223 info.nlmsg_seq = seq;
1224 info.nlmsg_flags = 0;
1225 info.this_idx = info.start_idx = 0;
1226
1227 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1228 kfree_skb(skb);
1229 return NULL;
1230 }
1231
1232 return skb;
1233}
1234
22e70050
CH		 1235static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1236 struct rtattr **xfrma)
1da177e4
LT		 1237{
1238 struct xfrm_policy *xp;
1239 struct xfrm_userpolicy_id *p;
b798a9ed 1240 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1241 int err;
26b15dad 1242 struct km_event c;
1da177e4
LT		 1243 int delete;
1244
1245 p = NLMSG_DATA(nlh);
1246 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1247
22e70050 1248 err = copy_from_user_policy_type(&type, xfrma);
f7b6983f
MN		 1249 if (err)
1250 return err;
1251
1da177e4
LT		 1252 err = verify_policy_dir(p->dir);
1253 if (err)
1254 return err;
1255
1256 if (p->index)
f7b6983f 1257 xp = xfrm_policy_byid(type, p->dir, p->index, delete);
df71837d 1258 else {
22e70050 1259 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
df71837d
TJ		 1260 struct xfrm_policy tmp;
1261
22e70050 1262 err = verify_sec_ctx_len(xfrma);
df71837d
TJ		 1263 if (err)
1264 return err;
1265
1266 memset(&tmp, 0, sizeof(struct xfrm_policy));
1267 if (rt) {
1268 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1269
1270 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1271 return err;
1272 }
f7b6983f 1273 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
df71837d
TJ		 1274 security_xfrm_policy_free(&tmp);
1275 }
161a09e7
JL		 1276 if (delete)
1277 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1278 AUDIT_MAC_IPSEC_DELSPD, (xp) ? 1 : 0, xp, NULL);
1279
1da177e4
LT		 1280 if (xp == NULL)
1281 return -ENOENT;
1282
1283 if (!delete) {
1284 struct sk_buff *resp_skb;
1285
1286 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1287 if (IS_ERR(resp_skb)) {
1288 err = PTR_ERR(resp_skb);
1289 } else {
1290 err = netlink_unicast(xfrm_nl, resp_skb,
1291 NETLINK_CB(skb).pid,
1292 MSG_DONTWAIT);
1293 }
26b15dad 1294 } else {
6f68dc37 1295 if ((err = security_xfrm_policy_delete(xp)) != 0)
c8c05a8e 1296 goto out;
e7443892 1297 c.data.byid = p->index;
f60f6b8f 1298 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1299 c.seq = nlh->nlmsg_seq;
1300 c.pid = nlh->nlmsg_pid;
1301 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1302 }
1303
1304 xfrm_pol_put(xp);
1305
c8c05a8e 1306out:
1da177e4
LT		 1307 return err;
1308}
1309
22e70050
CH		 1310static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1311 struct rtattr **xfrma)
1da177e4 1312{
26b15dad 1313 struct km_event c;
1da177e4 1314 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
161a09e7 1315 struct xfrm_audit audit_info;
1da177e4 1316
161a09e7
JL		 1317 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1318 audit_info.secid = NETLINK_CB(skb).sid;
1319 xfrm_state_flush(p->proto, &audit_info);
bf08867f 1320 c.data.proto = p->proto;
f60f6b8f 1321 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1322 c.seq = nlh->nlmsg_seq;
1323 c.pid = nlh->nlmsg_pid;
1324 km_state_notify(NULL, &c);
1325
1da177e4
LT		 1326 return 0;
1327}
1328
d51d081d
JHS		 1329
1330static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1331{
1332 struct xfrm_aevent_id *id;
1333 struct nlmsghdr *nlh;
1334 struct xfrm_lifetime_cur ltime;
1335 unsigned char *b = skb->tail;
1336
1337 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
1338 id = NLMSG_DATA(nlh);
1339 nlh->nlmsg_flags = 0;
1340
2b5f6dcc 1341 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
d51d081d
JHS		 1342 id->sa_id.spi = x->id.spi;
1343 id->sa_id.family = x->props.family;
1344 id->sa_id.proto = x->id.proto;
2b5f6dcc
JHS		 1345 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1346 id->reqid = x->props.reqid;
d51d081d
JHS		 1347 id->flags = c->data.aevent;
1348
1349 RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1350
1351 ltime.bytes = x->curlft.bytes;
1352 ltime.packets = x->curlft.packets;
1353 ltime.add_time = x->curlft.add_time;
1354 ltime.use_time = x->curlft.use_time;
1355
1356 RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
1357
1358 if (id->flags&XFRM_AE_RTHR) {
1359 RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
1360 }
1361
1362 if (id->flags&XFRM_AE_ETHR) {
1363 u32 etimer = x->replay_maxage*10/HZ;
1364 RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
1365 }
1366
1367 nlh->nlmsg_len = skb->tail - b;
1368 return skb->len;
1369
1370rtattr_failure:
1371nlmsg_failure:
1372 skb_trim(skb, b - skb->data);
1373 return -1;
1374}
1375
22e70050
CH		 1376static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1377 struct rtattr **xfrma)
d51d081d
JHS		 1378{
1379 struct xfrm_state *x;
1380 struct sk_buff *r_skb;
1381 int err;
1382 struct km_event c;
1383 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1384 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1385 struct xfrm_usersa_id *id = &p->sa_id;
1386
1387 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1388 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1389
1390 if (p->flags&XFRM_AE_RTHR)
1391 len+=RTA_SPACE(sizeof(u32));
1392
1393 if (p->flags&XFRM_AE_ETHR)
1394 len+=RTA_SPACE(sizeof(u32));
1395
1396 r_skb = alloc_skb(len, GFP_ATOMIC);
1397 if (r_skb == NULL)
1398 return -ENOMEM;
1399
1400 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1401 if (x == NULL) {
1402 kfree(r_skb);
1403 return -ESRCH;
1404 }
1405
1406 /*
1407 * XXX: is this lock really needed - none of the other
1408 * gets lock (the concern is things getting updated
1409 * while we are still reading) - jhs
1410 */
1411 spin_lock_bh(&x->lock);
1412 c.data.aevent = p->flags;
1413 c.seq = nlh->nlmsg_seq;
1414 c.pid = nlh->nlmsg_pid;
1415
1416 if (build_aevent(r_skb, x, &c) < 0)
1417 BUG();
1418 err = netlink_unicast(xfrm_nl, r_skb,
1419 NETLINK_CB(skb).pid, MSG_DONTWAIT);
1420 spin_unlock_bh(&x->lock);
1421 xfrm_state_put(x);
1422 return err;
1423}
1424
22e70050
CH		 1425static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1426 struct rtattr **xfrma)
d51d081d
JHS		 1427{
1428 struct xfrm_state *x;
1429 struct km_event c;
1430 int err = - EINVAL;
1431 struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
1432 struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
1433 struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
1434
1435 if (!lt && !rp)
1436 return err;
1437
1438 /* pedantic mode - thou shalt sayeth replaceth */
1439 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1440 return err;
1441
1442 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1443 if (x == NULL)
1444 return -ESRCH;
1445
1446 if (x->km.state != XFRM_STATE_VALID)
1447 goto out;
1448
1449 spin_lock_bh(&x->lock);
22e70050 1450 err = xfrm_update_ae_params(x, xfrma);
d51d081d
JHS		 1451 spin_unlock_bh(&x->lock);
1452 if (err < 0)
1453 goto out;
1454
1455 c.event = nlh->nlmsg_type;
1456 c.seq = nlh->nlmsg_seq;
1457 c.pid = nlh->nlmsg_pid;
1458 c.data.aevent = XFRM_AE_CU;
1459 km_state_notify(x, &c);
1460 err = 0;
1461out:
1462 xfrm_state_put(x);
1463 return err;
1464}
1465
22e70050
CH		 1466static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1467 struct rtattr **xfrma)
1da177e4 1468{
f7b6983f 1469 struct km_event c;
b798a9ed 1470 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1471 int err;
161a09e7 1472 struct xfrm_audit audit_info;
f7b6983f 1473
22e70050 1474 err = copy_from_user_policy_type(&type, xfrma);
f7b6983f
MN		 1475 if (err)
1476 return err;
26b15dad 1477
161a09e7
JL		 1478 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1479 audit_info.secid = NETLINK_CB(skb).sid;
1480 xfrm_policy_flush(type, &audit_info);
f7b6983f 1481 c.data.type = type;
f60f6b8f 1482 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1483 c.seq = nlh->nlmsg_seq;
1484 c.pid = nlh->nlmsg_pid;
1485 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1486 return 0;
1487}
1488
22e70050
CH		 1489static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1490 struct rtattr **xfrma)
6c5c8ca7
JHS		 1491{
1492 struct xfrm_policy *xp;
1493 struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
1494 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1495 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7
JHS		 1496 int err = -ENOENT;
1497
22e70050 1498 err = copy_from_user_policy_type(&type, xfrma);
f7b6983f
MN		 1499 if (err)
1500 return err;
1501
6c5c8ca7 1502 if (p->index)
f7b6983f 1503 xp = xfrm_policy_byid(type, p->dir, p->index, 0);
6c5c8ca7 1504 else {
22e70050 1505 struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
6c5c8ca7
JHS		 1506 struct xfrm_policy tmp;
1507
22e70050 1508 err = verify_sec_ctx_len(xfrma);
6c5c8ca7
JHS		 1509 if (err)
1510 return err;
1511
1512 memset(&tmp, 0, sizeof(struct xfrm_policy));
1513 if (rt) {
1514 struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
1515
1516 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1517 return err;
1518 }
f7b6983f 1519 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, 0);
6c5c8ca7
JHS		 1520 security_xfrm_policy_free(&tmp);
1521 }
1522
1523 if (xp == NULL)
1524 return err;
1525 read_lock(&xp->lock);
1526 if (xp->dead) {
1527 read_unlock(&xp->lock);
1528 goto out;
1529 }
1530
1531 read_unlock(&xp->lock);
1532 err = 0;
1533 if (up->hard) {
1534 xfrm_policy_delete(xp, p->dir);
161a09e7
JL		 1535 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1536 AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);
1537
6c5c8ca7
JHS		 1538 } else {
1539 // reset the timers here?
1540 printk("Dont know what to do with soft policy expire\n");
1541 }
1542 km_policy_expired(xp, p->dir, up->hard, current->pid);
1543
1544out:
1545 xfrm_pol_put(xp);
1546 return err;
1547}
1548
22e70050
CH		 1549static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1550 struct rtattr **xfrma)
53bc6b4d
JHS		 1551{
1552 struct xfrm_state *x;
1553 int err;
1554 struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
1555 struct xfrm_usersa_info *p = &ue->state;
1556
1557 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1558 err = -ENOENT;
1559
1560 if (x == NULL)
1561 return err;
1562
1563 err = -EINVAL;
1564
1565 spin_lock_bh(&x->lock);
1566 if (x->km.state != XFRM_STATE_VALID)
1567 goto out;
1568 km_state_expired(x, ue->hard, current->pid);
1569
161a09e7 1570 if (ue->hard) {
53bc6b4d 1571 __xfrm_state_delete(x);
161a09e7
JL		 1572 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1573 AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
1574 }
53bc6b4d
JHS		 1575out:
1576 spin_unlock_bh(&x->lock);
1577 xfrm_state_put(x);
1578 return err;
1579}
1580
22e70050
CH		 1581static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1582 struct rtattr **xfrma)
980ebd25
JHS		 1583{
1584 struct xfrm_policy *xp;
1585 struct xfrm_user_tmpl *ut;
1586 int i;
1587 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
1588
1589 struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
1590 struct xfrm_state *x = xfrm_state_alloc();
1591 int err = -ENOMEM;
1592
1593 if (!x)
1594 return err;
1595
1596 err = verify_newpolicy_info(&ua->policy);
1597 if (err) {
1598 printk("BAD policy passed\n");
1599 kfree(x);
1600 return err;
1601 }
1602
1603 /* build an XP */
b4ad86bf
DM		 1604 xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);
1605 if (!xp) {
980ebd25
JHS		 1606 kfree(x);
1607 return err;
1608 }
1609
1610 memcpy(&x->id, &ua->id, sizeof(ua->id));
1611 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1612 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1613
1614 ut = RTA_DATA(rt);
1615 /* extract the templates and for each call km_key */
1616 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1617 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1618 memcpy(&x->id, &t->id, sizeof(x->id));
1619 x->props.mode = t->mode;
1620 x->props.reqid = t->reqid;
1621 x->props.family = ut->family;
1622 t->aalgos = ua->aalgos;
1623 t->ealgos = ua->ealgos;
1624 t->calgos = ua->calgos;
1625 err = km_query(x, t, xp);
1626
1627 }
1628
1629 kfree(x);
1630 kfree(xp);
1631
1632 return 0;
1633}
1634
d51d081d 1635
492b558b
TG		 1636#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
1637
1638static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1639 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1640 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1641 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1642 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1643 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1644 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1645 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 1646 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 1647 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b
TG		 1648 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1649 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 1650 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b
TG		 1651 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1652 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
d51d081d
JHS		 1653 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1654 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 1655 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1da177e4
LT		 1656};
1657
492b558b
TG		 1658#undef XMSGSIZE
1659
1da177e4 1660static struct xfrm_link {
22e70050 1661 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
1da177e4 1662 int (*dump)(struct sk_buff *, struct netlink_callback *);
492b558b
TG		 1663} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1664 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1665 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1666 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1667 .dump = xfrm_dump_sa },
1668 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1669 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1670 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1671 .dump = xfrm_dump_policy },
1672 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 1673 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 1674 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 1675 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1676 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 1677 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 1678 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1679 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 1680 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1681 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1da177e4
LT		 1682};
1683
1da177e4
LT		 1684static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
1685{
1686 struct rtattr *xfrma[XFRMA_MAX];
1687 struct xfrm_link *link;
1688 int type, min_len;
1689
1690 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
1691 return 0;
1692
1693 type = nlh->nlmsg_type;
1694
1695 /* A control message: ignore them */
1696 if (type < XFRM_MSG_BASE)
1697 return 0;
1698
1699 /* Unknown message: reply with EINVAL */
1700 if (type > XFRM_MSG_MAX)
1701 goto err_einval;
1702
1703 type -= XFRM_MSG_BASE;
1704 link = &xfrm_dispatch[type];
1705
1706 /* All operations require privileges, even GET */
c7bdb545 1707 if (security_netlink_recv(skb, CAP_NET_ADMIN)) {
1da177e4
LT		 1708 *errp = -EPERM;
1709 return -1;
1710 }
1711
492b558b
TG		 1712 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1713 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1714 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4
LT		 1715 if (link->dump == NULL)
1716 goto err_einval;
1717
1718 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
a8f74b22 1719 link->dump, NULL)) != 0) {
1da177e4
LT		 1720 return -1;
1721 }
88fc2c84
TG		 1722
1723 netlink_queue_skip(nlh, skb);
1da177e4
LT		 1724 return -1;
1725 }
1726
1727 memset(xfrma, 0, sizeof(xfrma));
1728
1729 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1730 goto err_einval;
1731
1732 if (nlh->nlmsg_len > min_len) {
1733 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1734 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1735
1736 while (RTA_OK(attr, attrlen)) {
1737 unsigned short flavor = attr->rta_type;
1738 if (flavor) {
1739 if (flavor > XFRMA_MAX)
1740 goto err_einval;
1741 xfrma[flavor - 1] = attr;
1742 }
1743 attr = RTA_NEXT(attr, attrlen);
1744 }
1745 }
1746
1747 if (link->doit == NULL)
1748 goto err_einval;
22e70050 1749 *errp = link->doit(skb, nlh, xfrma);
1da177e4
LT		 1750
1751 return *errp;
1752
1753err_einval:
1754 *errp = -EINVAL;
1755 return -1;
1756}
1757
1da177e4
LT		 1758static void xfrm_netlink_rcv(struct sock *sk, int len)
1759{
88fc2c84 1760 unsigned int qlen = 0;
2a0a6ebe 1761
1da177e4 1762 do {
4a3e2f71 1763 mutex_lock(&xfrm_cfg_mutex);
88fc2c84 1764 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
4a3e2f71 1765 mutex_unlock(&xfrm_cfg_mutex);
1da177e4 1766
2a0a6ebe 1767 } while (qlen);
1da177e4
LT		 1768}
1769
d51d081d 1770static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 1771{
1772 struct xfrm_user_expire *ue;
1773 struct nlmsghdr *nlh;
1774 unsigned char *b = skb->tail;
1775
d51d081d 1776 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
1da177e4
LT		 1777 sizeof(*ue));
1778 ue = NLMSG_DATA(nlh);
1779 nlh->nlmsg_flags = 0;
1780
1781 copy_to_user_state(x, &ue->state);
d51d081d 1782 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4
LT		 1783
1784 nlh->nlmsg_len = skb->tail - b;
1785 return skb->len;
1786
1787nlmsg_failure:
1788 skb_trim(skb, b - skb->data);
1789 return -1;
1790}
1791
26b15dad 1792static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1da177e4
LT		 1793{
1794 struct sk_buff *skb;
ee57eef9 1795 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1da177e4 1796
ee57eef9 1797 skb = alloc_skb(len, GFP_ATOMIC);
1da177e4
LT		 1798 if (skb == NULL)
1799 return -ENOMEM;
1800
d51d081d 1801 if (build_expire(skb, x, c) < 0)
1da177e4
LT		 1802 BUG();
1803
ac6d439d
PM		 1804 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
1805 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 1806}
1807
d51d081d
JHS		 1808static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1809{
1810 struct sk_buff *skb;
1811 int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
1812
1813 len += RTA_SPACE(sizeof(struct xfrm_replay_state));
1814 len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
1815 skb = alloc_skb(len, GFP_ATOMIC);
1816 if (skb == NULL)
1817 return -ENOMEM;
1818
1819 if (build_aevent(skb, x, c) < 0)
1820 BUG();
1821
1822 NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
1823 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1824}
1825
26b15dad
JHS		 1826static int xfrm_notify_sa_flush(struct km_event *c)
1827{
1828 struct xfrm_usersa_flush *p;
1829 struct nlmsghdr *nlh;
1830 struct sk_buff *skb;
1831 unsigned char *b;
1832 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1833
1834 skb = alloc_skb(len, GFP_ATOMIC);
1835 if (skb == NULL)
1836 return -ENOMEM;
1837 b = skb->tail;
1838
1839 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1840 XFRM_MSG_FLUSHSA, sizeof(*p));
1841 nlh->nlmsg_flags = 0;
1842
1843 p = NLMSG_DATA(nlh);
bf08867f 1844 p->proto = c->data.proto;
26b15dad
JHS		 1845
1846 nlh->nlmsg_len = skb->tail - b;
1847
ac6d439d
PM		 1848 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1849 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 1850
1851nlmsg_failure:
1852 kfree_skb(skb);
1853 return -1;
1854}
1855
1856static int inline xfrm_sa_len(struct xfrm_state *x)
1857{
0603eac0 1858 int l = 0;
26b15dad
JHS		 1859 if (x->aalg)
1860 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1861 if (x->ealg)
1862 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1863 if (x->calg)
1864 l += RTA_SPACE(sizeof(*x->calg));
1865 if (x->encap)
1866 l += RTA_SPACE(sizeof(*x->encap));
1867
1868 return l;
1869}
1870
1871static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1872{
1873 struct xfrm_usersa_info *p;
0603eac0 1874 struct xfrm_usersa_id *id;
26b15dad
JHS		 1875 struct nlmsghdr *nlh;
1876 struct sk_buff *skb;
26b15dad
JHS		 1877 unsigned char *b;
1878 int len = xfrm_sa_len(x);
0603eac0
HX		 1879 int headlen;
1880
1881 headlen = sizeof(*p);
1882 if (c->event == XFRM_MSG_DELSA) {
1883 len += RTA_SPACE(headlen);
1884 headlen = sizeof(*id);
1885 }
1886 len += NLMSG_SPACE(headlen);
26b15dad
JHS		 1887
1888 skb = alloc_skb(len, GFP_ATOMIC);
1889 if (skb == NULL)
1890 return -ENOMEM;
1891 b = skb->tail;
1892
0603eac0 1893 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
26b15dad
JHS		 1894 nlh->nlmsg_flags = 0;
1895
1896 p = NLMSG_DATA(nlh);
0603eac0
HX		 1897 if (c->event == XFRM_MSG_DELSA) {
1898 id = NLMSG_DATA(nlh);
1899 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1900 id->spi = x->id.spi;
1901 id->family = x->props.family;
1902 id->proto = x->id.proto;
1903
1904 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1905 }
1906
26b15dad
JHS		 1907 copy_to_user_state(x, p);
1908
1909 if (x->aalg)
1910 RTA_PUT(skb, XFRMA_ALG_AUTH,
1911 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1912 if (x->ealg)
1913 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1914 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1915 if (x->calg)
1916 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1917
1918 if (x->encap)
1919 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1920
1921 nlh->nlmsg_len = skb->tail - b;
1922
ac6d439d
PM		 1923 NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
1924 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 1925
1926nlmsg_failure:
1927rtattr_failure:
1928 kfree_skb(skb);
1929 return -1;
1930}
1931
1932static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1933{
1934
1935 switch (c->event) {
f60f6b8f 1936 case XFRM_MSG_EXPIRE:
26b15dad 1937 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 1938 case XFRM_MSG_NEWAE:
1939 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 1940 case XFRM_MSG_DELSA:
1941 case XFRM_MSG_UPDSA:
1942 case XFRM_MSG_NEWSA:
26b15dad 1943 return xfrm_notify_sa(x, c);
f60f6b8f 1944 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 1945 return xfrm_notify_sa_flush(c);
1946 default:
1947 printk("xfrm_user: Unknown SA event %d\n", c->event);
1948 break;
1949 }
1950
1951 return 0;
1952
1953}
1954
1da177e4
LT		 1955static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1956 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1957 int dir)
1958{
1959 struct xfrm_user_acquire *ua;
1960 struct nlmsghdr *nlh;
1961 unsigned char *b = skb->tail;
1962 __u32 seq = xfrm_get_acqseq();
1963
1964 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1965 sizeof(*ua));
1966 ua = NLMSG_DATA(nlh);
1967 nlh->nlmsg_flags = 0;
1968
1969 memcpy(&ua->id, &x->id, sizeof(ua->id));
1970 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1971 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1972 copy_to_user_policy(xp, &ua->policy, dir);
1973 ua->aalgos = xt->aalgos;
1974 ua->ealgos = xt->ealgos;
1975 ua->calgos = xt->calgos;
1976 ua->seq = x->km.seq = seq;
1977
1978 if (copy_to_user_tmpl(xp, skb) < 0)
1979 goto nlmsg_failure;
0d681623 1980 if (copy_to_user_state_sec_ctx(x, skb))
df71837d 1981 goto nlmsg_failure;
1459bb36 1982 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 1983 goto nlmsg_failure;
1da177e4
LT		 1984
1985 nlh->nlmsg_len = skb->tail - b;
1986 return skb->len;
1987
1988nlmsg_failure:
1989 skb_trim(skb, b - skb->data);
1990 return -1;
1991}
1992
1993static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1994 struct xfrm_policy *xp, int dir)
1995{
1996 struct sk_buff *skb;
1997 size_t len;
1998
1999 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2000 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
df71837d 2001 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
785fd8b8
JHS		 2002#ifdef CONFIG_XFRM_SUB_POLICY
2003 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2004#endif
1da177e4
LT		 2005 skb = alloc_skb(len, GFP_ATOMIC);
2006 if (skb == NULL)
2007 return -ENOMEM;
2008
2009 if (build_acquire(skb, x, xt, xp, dir) < 0)
2010 BUG();
2011
ac6d439d
PM		 2012 NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
2013 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2014}
2015
2016/* User gives us xfrm_user_policy_info followed by an array of 0
2017 * or more templates.
2018 */
cb969f07 2019static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2020 u8 *data, int len, int *dir)
2021{
2022 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2023 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2024 struct xfrm_policy *xp;
2025 int nr;
2026
cb969f07 2027 switch (sk->sk_family) {
1da177e4
LT		 2028 case AF_INET:
2029 if (opt != IP_XFRM_POLICY) {
2030 *dir = -EOPNOTSUPP;
2031 return NULL;
2032 }
2033 break;
2034#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2035 case AF_INET6:
2036 if (opt != IPV6_XFRM_POLICY) {
2037 *dir = -EOPNOTSUPP;
2038 return NULL;
2039 }
2040 break;
2041#endif
2042 default:
2043 *dir = -EINVAL;
2044 return NULL;
2045 }
2046
2047 *dir = -EINVAL;
2048
2049 if (len < sizeof(*p) ||
2050 verify_newpolicy_info(p))
2051 return NULL;
2052
2053 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2054 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2055 return NULL;
2056
a4f1bac6
HX		 2057 if (p->dir > XFRM_POLICY_OUT)
2058 return NULL;
2059
1da177e4
LT		 2060 xp = xfrm_policy_alloc(GFP_KERNEL);
2061 if (xp == NULL) {
2062 *dir = -ENOBUFS;
2063 return NULL;
2064 }
2065
2066 copy_from_user_policy(xp, p);
f7b6983f 2067 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2068 copy_templates(xp, ut, nr);
2069
2070 *dir = p->dir;
2071
2072 return xp;
2073}
2074
2075static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
d51d081d 2076 int dir, struct km_event *c)
1da177e4
LT		 2077{
2078 struct xfrm_user_polexpire *upe;
2079 struct nlmsghdr *nlh;
d51d081d 2080 int hard = c->data.hard;
1da177e4
LT		 2081 unsigned char *b = skb->tail;
2082
d51d081d 2083 nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1da177e4
LT		 2084 upe = NLMSG_DATA(nlh);
2085 nlh->nlmsg_flags = 0;
2086
2087 copy_to_user_policy(xp, &upe->pol, dir);
2088 if (copy_to_user_tmpl(xp, skb) < 0)
2089 goto nlmsg_failure;
df71837d
TJ		 2090 if (copy_to_user_sec_ctx(xp, skb))
2091 goto nlmsg_failure;
1459bb36 2092 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2093 goto nlmsg_failure;
1da177e4
LT		 2094 upe->hard = !!hard;
2095
2096 nlh->nlmsg_len = skb->tail - b;
2097 return skb->len;
2098
2099nlmsg_failure:
2100 skb_trim(skb, b - skb->data);
2101 return -1;
2102}
2103
26b15dad 2104static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1da177e4
LT		 2105{
2106 struct sk_buff *skb;
2107 size_t len;
2108
2109 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2110 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
df71837d 2111 len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
785fd8b8
JHS		 2112#ifdef CONFIG_XFRM_SUB_POLICY
2113 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2114#endif
1da177e4
LT		 2115 skb = alloc_skb(len, GFP_ATOMIC);
2116 if (skb == NULL)
2117 return -ENOMEM;
2118
d51d081d 2119 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2120 BUG();
2121
ac6d439d
PM		 2122 NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
2123 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2124}
2125
26b15dad
JHS		 2126static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2127{
2128 struct xfrm_userpolicy_info *p;
0603eac0 2129 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2130 struct nlmsghdr *nlh;
2131 struct sk_buff *skb;
26b15dad
JHS		 2132 unsigned char *b;
2133 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
0603eac0
HX		 2134 int headlen;
2135
2136 headlen = sizeof(*p);
2137 if (c->event == XFRM_MSG_DELPOLICY) {
2138 len += RTA_SPACE(headlen);
2139 headlen = sizeof(*id);
2140 }
334f3d45
JHS		 2141#ifdef CONFIG_XFRM_SUB_POLICY
2142 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2143#endif
0603eac0 2144 len += NLMSG_SPACE(headlen);
26b15dad
JHS		 2145
2146 skb = alloc_skb(len, GFP_ATOMIC);
2147 if (skb == NULL)
2148 return -ENOMEM;
2149 b = skb->tail;
2150
0603eac0 2151 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
26b15dad
JHS		 2152
2153 p = NLMSG_DATA(nlh);
0603eac0
HX		 2154 if (c->event == XFRM_MSG_DELPOLICY) {
2155 id = NLMSG_DATA(nlh);
2156 memset(id, 0, sizeof(*id));
2157 id->dir = dir;
2158 if (c->data.byid)
2159 id->index = xp->index;
2160 else
2161 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2162
2163 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
2164 }
26b15dad
JHS		 2165
2166 nlh->nlmsg_flags = 0;
2167
2168 copy_to_user_policy(xp, p, dir);
2169 if (copy_to_user_tmpl(xp, skb) < 0)
2170 goto nlmsg_failure;
1459bb36 2171 if (copy_to_user_policy_type(xp->type, skb) < 0)
f7b6983f 2172 goto nlmsg_failure;
26b15dad
JHS		 2173
2174 nlh->nlmsg_len = skb->tail - b;
2175
ac6d439d
PM		 2176 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2177 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 2178
2179nlmsg_failure:
0603eac0 2180rtattr_failure:
26b15dad
JHS		 2181 kfree_skb(skb);
2182 return -1;
2183}
2184
2185static int xfrm_notify_policy_flush(struct km_event *c)
2186{
2187 struct nlmsghdr *nlh;
2188 struct sk_buff *skb;
2189 unsigned char *b;
785fd8b8 2190 int len = 0;
f7b6983f 2191#ifdef CONFIG_XFRM_SUB_POLICY
785fd8b8 2192 len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
f7b6983f 2193#endif
785fd8b8 2194 len += NLMSG_LENGTH(0);
26b15dad
JHS		 2195
2196 skb = alloc_skb(len, GFP_ATOMIC);
2197 if (skb == NULL)
2198 return -ENOMEM;
2199 b = skb->tail;
2200
2201
2202 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
f7b6983f 2203 nlh->nlmsg_flags = 0;
0c51f53c
JHS		 2204 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2205 goto nlmsg_failure;
26b15dad
JHS		 2206
2207 nlh->nlmsg_len = skb->tail - b;
2208
ac6d439d
PM		 2209 NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
2210 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad
JHS		 2211
2212nlmsg_failure:
2213 kfree_skb(skb);
2214 return -1;
2215}
2216
2217static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2218{
2219
2220 switch (c->event) {
f60f6b8f
HX		 2221 case XFRM_MSG_NEWPOLICY:
2222 case XFRM_MSG_UPDPOLICY:
2223 case XFRM_MSG_DELPOLICY:
26b15dad 2224 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2225 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2226 return xfrm_notify_policy_flush(c);
f60f6b8f 2227 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2228 return xfrm_exp_policy_notify(xp, dir, c);
2229 default:
2230 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2231 }
2232
2233 return 0;
2234
2235}
2236
97a64b45
MN		 2237static int build_report(struct sk_buff *skb, u8 proto,
2238 struct xfrm_selector *sel, xfrm_address_t *addr)
2239{
2240 struct xfrm_user_report *ur;
2241 struct nlmsghdr *nlh;
2242 unsigned char *b = skb->tail;
2243
2244 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
2245 ur = NLMSG_DATA(nlh);
2246 nlh->nlmsg_flags = 0;
2247
2248 ur->proto = proto;
2249 memcpy(&ur->sel, sel, sizeof(ur->sel));
2250
2251 if (addr)
2252 RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2253
2254 nlh->nlmsg_len = skb->tail - b;
2255 return skb->len;
2256
2257nlmsg_failure:
2258rtattr_failure:
2259 skb_trim(skb, b - skb->data);
2260 return -1;
2261}
2262
2263static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2264 xfrm_address_t *addr)
2265{
2266 struct sk_buff *skb;
2267 size_t len;
2268
2269 len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
2270 skb = alloc_skb(len, GFP_ATOMIC);
2271 if (skb == NULL)
2272 return -ENOMEM;
2273
2274 if (build_report(skb, proto, sel, addr) < 0)
2275 BUG();
2276
2277 NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
2278 return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2279}
2280
1da177e4
LT		 2281static struct xfrm_mgr netlink_mgr = {
2282 .id = "netlink",
2283 .notify = xfrm_send_state_notify,
2284 .acquire = xfrm_send_acquire,
2285 .compile_policy = xfrm_compile_policy,
2286 .notify_policy = xfrm_send_policy_notify,
97a64b45 2287 .report = xfrm_send_report,
1da177e4
LT		 2288};
2289
2290static int __init xfrm_user_init(void)
2291{
be33690d
PM		 2292 struct sock *nlsk;
2293
654b32c6 2294 printk(KERN_INFO "Initializing XFRM netlink socket\n");
1da177e4 2295
be33690d
PM		 2296 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2297 xfrm_netlink_rcv, THIS_MODULE);
2298 if (nlsk == NULL)
1da177e4 2299 return -ENOMEM;
be33690d 2300 rcu_assign_pointer(xfrm_nl, nlsk);
1da177e4
LT		 2301
2302 xfrm_register_km(&netlink_mgr);
2303
2304 return 0;
2305}
2306
2307static void __exit xfrm_user_exit(void)
2308{
be33690d
PM		 2309 struct sock *nlsk = xfrm_nl;
2310
1da177e4 2311 xfrm_unregister_km(&netlink_mgr);
be33690d
PM		 2312 rcu_assign_pointer(xfrm_nl, NULL);
2313 synchronize_rcu();
2314 sock_release(nlsk->sk_socket);
1da177e4
LT		 2315}
2316
2317module_init(xfrm_user_init);
2318module_exit(xfrm_user_exit);
2319MODULE_LICENSE("GPL");
4fdb3bb7 2320MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 2321
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