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xfrm_user: fix info leak in copy_to_user_auth()
[mirror_ubuntu-hirsute-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/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
88fc2c84 28#include <net/netlink.h>
fa6dd8a2 29#include <net/ah.h>
1da177e4 30#include <asm/uaccess.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 32#include <linux/in6.h>
33#endif
1da177e4 34
1a6509d9
HX		 35static inline int aead_len(struct xfrm_algo_aead *alg)
36{
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38}
39
5424f32e 40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 41{
5424f32e 42 struct nlattr *rt = attrs[type];
1da177e4
LT		 43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
5424f32e 48 algp = nla_data(rt);
0f99be0d 49 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 50 return -EINVAL;
51
1da177e4
LT		 52 switch (type) {
53 case XFRMA_ALG_AUTH:
1da177e4 54 case XFRMA_ALG_CRYPT:
1da177e4 55 case XFRMA_ALG_COMP:
1da177e4
LT		 56 break;
57
58 default:
59 return -EINVAL;
3ff50b79 60 }
1da177e4
LT		 61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64}
65
4447bb33
MW		 66static int verify_auth_trunc(struct nlattr **attrs)
67{
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80}
81
1a6509d9
HX		 82static int verify_aead(struct nlattr **attrs)
83{
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96}
97
5424f32e 98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 99 xfrm_address_t **addrp)
100{
5424f32e 101 struct nlattr *rt = attrs[type];
eb2971b6 102
cf5cb79f 103 if (rt && addrp)
5424f32e 104 *addrp = nla_data(rt);
eb2971b6 105}
df71837d 106
5424f32e 107static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 108{
5424f32e 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 110 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 111
112 if (!rt)
113 return 0;
114
5424f32e 115 uctx = nla_data(rt);
cf5cb79f 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 117 return -EINVAL;
118
119 return 0;
120}
121
d8647b79
SK		 122static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124{
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126
7833aa05
SK		 127 if ((p->flags & XFRM_STATE_ESN) && !rt)
128 return -EINVAL;
129
d8647b79
SK		 130 if (!rt)
131 return 0;
132
02aadf72
SK		 133 if (p->id.proto != IPPROTO_ESP)
134 return -EINVAL;
135
d8647b79
SK		 136 if (p->replay_window != 0)
137 return -EINVAL;
138
139 return 0;
140}
df71837d 141
1da177e4 142static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 143 struct nlattr **attrs)
1da177e4
LT		 144{
145 int err;
146
147 err = -EINVAL;
148 switch (p->family) {
149 case AF_INET:
150 break;
151
152 case AF_INET6:
dfd56b8b 153#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 154 break;
155#else
156 err = -EAFNOSUPPORT;
157 goto out;
158#endif
159
160 default:
161 goto out;
3ff50b79 162 }
1da177e4
LT		 163
164 err = -EINVAL;
165 switch (p->id.proto) {
166 case IPPROTO_AH:
4447bb33
MW		 167 if ((!attrs[XFRMA_ALG_AUTH] &&
168 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 169 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 170 attrs[XFRMA_ALG_CRYPT] ||
35d2856b
MW		 171 attrs[XFRMA_ALG_COMP] ||
172 attrs[XFRMA_TFCPAD])
1da177e4
LT		 173 goto out;
174 break;
175
176 case IPPROTO_ESP:
1a6509d9
HX		 177 if (attrs[XFRMA_ALG_COMP])
178 goto out;
179 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 180 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 181 !attrs[XFRMA_ALG_CRYPT] &&
182 !attrs[XFRMA_ALG_AEAD])
183 goto out;
184 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 185 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 186 attrs[XFRMA_ALG_CRYPT]) &&
187 attrs[XFRMA_ALG_AEAD])
1da177e4 188 goto out;
35d2856b
MW		 189 if (attrs[XFRMA_TFCPAD] &&
190 p->mode != XFRM_MODE_TUNNEL)
191 goto out;
1da177e4
LT		 192 break;
193
194 case IPPROTO_COMP:
35a7aa08 195 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 196 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 197 attrs[XFRMA_ALG_AUTH] ||
4447bb33 198 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b
MW		 199 attrs[XFRMA_ALG_CRYPT] ||
200 attrs[XFRMA_TFCPAD])
1da177e4
LT		 201 goto out;
202 break;
203
dfd56b8b 204#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 205 case IPPROTO_DSTOPTS:
206 case IPPROTO_ROUTING:
35a7aa08
TG		 207 if (attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AUTH] ||
4447bb33 209 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9 210 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_ENCAP] ||
213 attrs[XFRMA_SEC_CTX] ||
35d2856b 214 attrs[XFRMA_TFCPAD] ||
35a7aa08 215 !attrs[XFRMA_COADDR])
e23c7194
MN		 216 goto out;
217 break;
218#endif
219
1da177e4
LT		 220 default:
221 goto out;
3ff50b79 222 }
1da177e4 223
1a6509d9
HX		 224 if ((err = verify_aead(attrs)))
225 goto out;
4447bb33
MW		 226 if ((err = verify_auth_trunc(attrs)))
227 goto out;
35a7aa08 228 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 229 goto out;
35a7aa08 230 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 231 goto out;
35a7aa08 232 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 233 goto out;
35a7aa08 234 if ((err = verify_sec_ctx_len(attrs)))
df71837d 235 goto out;
d8647b79
SK		 236 if ((err = verify_replay(p, attrs)))
237 goto out;
1da177e4
LT		 238
239 err = -EINVAL;
240 switch (p->mode) {
7e49e6de
MN		 241 case XFRM_MODE_TRANSPORT:
242 case XFRM_MODE_TUNNEL:
060f02a3 243 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 244 case XFRM_MODE_BEET:
1da177e4
LT		 245 break;
246
247 default:
248 goto out;
3ff50b79 249 }
1da177e4
LT		 250
251 err = 0;
252
253out:
254 return err;
255}
256
257static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
6f2f19ed 258 struct xfrm_algo_desc *(*get_byname)(const char *, int),
5424f32e 259 struct nlattr *rta)
1da177e4 260{
1da177e4
LT		 261 struct xfrm_algo *p, *ualg;
262 struct xfrm_algo_desc *algo;
263
264 if (!rta)
265 return 0;
266
5424f32e 267 ualg = nla_data(rta);
1da177e4
LT		 268
269 algo = get_byname(ualg->alg_name, 1);
270 if (!algo)
271 return -ENOSYS;
272 *props = algo->desc.sadb_alg_id;
273
0f99be0d 274 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 275 if (!p)
276 return -ENOMEM;
277
04ff1260 278 strcpy(p->alg_name, algo->name);
1da177e4
LT		 279 *algpp = p;
280 return 0;
281}
282
4447bb33
MW		 283static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
284 struct nlattr *rta)
285{
286 struct xfrm_algo *ualg;
287 struct xfrm_algo_auth *p;
288 struct xfrm_algo_desc *algo;
289
290 if (!rta)
291 return 0;
292
293 ualg = nla_data(rta);
294
295 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
296 if (!algo)
297 return -ENOSYS;
298 *props = algo->desc.sadb_alg_id;
299
300 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
301 if (!p)
302 return -ENOMEM;
303
304 strcpy(p->alg_name, algo->name);
305 p->alg_key_len = ualg->alg_key_len;
306 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
307 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
308
309 *algpp = p;
310 return 0;
311}
312
313static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315{
316 struct xfrm_algo_auth *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
fa6dd8a2
ND		 327 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
328 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 329 return -EINVAL;
330 *props = algo->desc.sadb_alg_id;
331
332 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
333 if (!p)
334 return -ENOMEM;
335
336 strcpy(p->alg_name, algo->name);
337 if (!p->alg_trunc_len)
338 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
339
340 *algpp = p;
341 return 0;
342}
343
1a6509d9
HX		 344static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
345 struct nlattr *rta)
346{
347 struct xfrm_algo_aead *p, *ualg;
348 struct xfrm_algo_desc *algo;
349
350 if (!rta)
351 return 0;
352
353 ualg = nla_data(rta);
354
355 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
356 if (!algo)
357 return -ENOSYS;
358 *props = algo->desc.sadb_alg_id;
359
360 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
361 if (!p)
362 return -ENOMEM;
363
364 strcpy(p->alg_name, algo->name);
365 *algpp = p;
366 return 0;
367}
368
e2b19125
SK		 369static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
370 struct nlattr *rp)
371{
372 struct xfrm_replay_state_esn *up;
373
374 if (!replay_esn || !rp)
375 return 0;
376
377 up = nla_data(rp);
378
379 if (xfrm_replay_state_esn_len(replay_esn) !=
380 xfrm_replay_state_esn_len(up))
381 return -EINVAL;
382
383 return 0;
384}
385
d8647b79
SK		 386static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
387 struct xfrm_replay_state_esn **preplay_esn,
388 struct nlattr *rta)
389{
390 struct xfrm_replay_state_esn *p, *pp, *up;
391
392 if (!rta)
393 return 0;
394
395 up = nla_data(rta);
396
397 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
398 if (!p)
399 return -ENOMEM;
400
401 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
402 if (!pp) {
403 kfree(p);
404 return -ENOMEM;
405 }
406
407 *replay_esn = p;
408 *preplay_esn = pp;
409
410 return 0;
411}
412
661697f7 413static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 414{
df71837d
TJ		 415 int len = 0;
416
417 if (xfrm_ctx) {
418 len += sizeof(struct xfrm_user_sec_ctx);
419 len += xfrm_ctx->ctx_len;
420 }
421 return len;
422}
423
1da177e4
LT		 424static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
425{
426 memcpy(&x->id, &p->id, sizeof(x->id));
427 memcpy(&x->sel, &p->sel, sizeof(x->sel));
428 memcpy(&x->lft, &p->lft, sizeof(x->lft));
429 x->props.mode = p->mode;
430 x->props.replay_window = p->replay_window;
431 x->props.reqid = p->reqid;
432 x->props.family = p->family;
54489c14 433 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 434 x->props.flags = p->flags;
196b0036 435
ccf9b3b8 436 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 437 x->sel.family = p->family;
1da177e4
LT		 438}
439
d51d081d
JHS		 440/*
441 * someday when pfkey also has support, we could have the code
442 * somehow made shareable and move it to xfrm_state.c - JHS
443 *
444*/
5424f32e 445static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
d51d081d 446{
5424f32e 447 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 448 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e
TG		 449 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
450 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
451 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 452
d8647b79
SK		 453 if (re) {
454 struct xfrm_replay_state_esn *replay_esn;
455 replay_esn = nla_data(re);
456 memcpy(x->replay_esn, replay_esn,
457 xfrm_replay_state_esn_len(replay_esn));
458 memcpy(x->preplay_esn, replay_esn,
459 xfrm_replay_state_esn_len(replay_esn));
460 }
461
d51d081d
JHS		 462 if (rp) {
463 struct xfrm_replay_state *replay;
5424f32e 464 replay = nla_data(rp);
d51d081d
JHS		 465 memcpy(&x->replay, replay, sizeof(*replay));
466 memcpy(&x->preplay, replay, sizeof(*replay));
467 }
468
469 if (lt) {
470 struct xfrm_lifetime_cur *ltime;
5424f32e 471 ltime = nla_data(lt);
d51d081d
JHS		 472 x->curlft.bytes = ltime->bytes;
473 x->curlft.packets = ltime->packets;
474 x->curlft.add_time = ltime->add_time;
475 x->curlft.use_time = ltime->use_time;
476 }
477
cf5cb79f 478 if (et)
5424f32e 479 x->replay_maxage = nla_get_u32(et);
d51d081d 480
cf5cb79f 481 if (rt)
5424f32e 482 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 483}
484
fc34acd3
AD		 485static struct xfrm_state *xfrm_state_construct(struct net *net,
486 struct xfrm_usersa_info *p,
5424f32e 487 struct nlattr **attrs,
1da177e4
LT		 488 int *errp)
489{
fc34acd3 490 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 491 int err = -ENOMEM;
492
493 if (!x)
494 goto error_no_put;
495
496 copy_from_user_state(x, p);
497
1a6509d9
HX		 498 if ((err = attach_aead(&x->aead, &x->props.ealgo,
499 attrs[XFRMA_ALG_AEAD])))
500 goto error;
4447bb33
MW		 501 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
502 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 503 goto error;
4447bb33
MW		 504 if (!x->props.aalgo) {
505 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
506 attrs[XFRMA_ALG_AUTH])))
507 goto error;
508 }
1da177e4
LT		 509 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
510 xfrm_ealg_get_byname,
35a7aa08 511 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 512 goto error;
513 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
514 xfrm_calg_get_byname,
35a7aa08 515 attrs[XFRMA_ALG_COMP])))
1da177e4 516 goto error;
fd21150a
TG		 517
518 if (attrs[XFRMA_ENCAP]) {
519 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
520 sizeof(*x->encap), GFP_KERNEL);
521 if (x->encap == NULL)
522 goto error;
523 }
524
35d2856b
MW		 525 if (attrs[XFRMA_TFCPAD])
526 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
527
fd21150a
TG		 528 if (attrs[XFRMA_COADDR]) {
529 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
530 sizeof(*x->coaddr), GFP_KERNEL);
531 if (x->coaddr == NULL)
532 goto error;
533 }
534
6f26b61e
JHS		 535 xfrm_mark_get(attrs, &x->mark);
536
a454f0cc 537 err = __xfrm_init_state(x, false);
1da177e4
LT		 538 if (err)
539 goto error;
540
fd21150a
TG		 541 if (attrs[XFRMA_SEC_CTX] &&
542 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 543 goto error;
544
d8647b79
SK		 545 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
546 attrs[XFRMA_REPLAY_ESN_VAL])))
547 goto error;
548
1da177e4 549 x->km.seq = p->seq;
b27aeadb 550 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 551 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 552 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 553
9fdc4883
SK		 554 if ((err = xfrm_init_replay(x)))
555 goto error;
d51d081d 556
9fdc4883 557 /* override default values from above */
5424f32e 558 xfrm_update_ae_params(x, attrs);
1da177e4
LT		 559
560 return x;
561
562error:
563 x->km.state = XFRM_STATE_DEAD;
564 xfrm_state_put(x);
565error_no_put:
566 *errp = err;
567 return NULL;
568}
569
22e70050 570static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 571 struct nlattr **attrs)
1da177e4 572{
fc34acd3 573 struct net *net = sock_net(skb->sk);
7b67c857 574 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 575 struct xfrm_state *x;
576 int err;
26b15dad 577 struct km_event c;
c53fa1ed
PM		 578 uid_t loginuid = audit_get_loginuid(current);
579 u32 sessionid = audit_get_sessionid(current);
580 u32 sid;
1da177e4 581
35a7aa08 582 err = verify_newsa_info(p, attrs);
1da177e4
LT		 583 if (err)
584 return err;
585
fc34acd3 586 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 587 if (!x)
588 return err;
589
26b15dad 590 xfrm_state_hold(x);
1da177e4
LT		 591 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
592 err = xfrm_state_add(x);
593 else
594 err = xfrm_state_update(x);
595
c53fa1ed 596 security_task_getsecid(current, &sid);
2532386f 597 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 598
1da177e4
LT		 599 if (err < 0) {
600 x->km.state = XFRM_STATE_DEAD;
21380b81 601 __xfrm_state_put(x);
7d6dfe1f 602 goto out;
1da177e4
LT		 603 }
604
26b15dad
JHS		 605 c.seq = nlh->nlmsg_seq;
606 c.pid = nlh->nlmsg_pid;
f60f6b8f 607 c.event = nlh->nlmsg_type;
26b15dad
JHS		 608
609 km_state_notify(x, &c);
7d6dfe1f 610out:
26b15dad 611 xfrm_state_put(x);
1da177e4
LT		 612 return err;
613}
614
fc34acd3
AD		 615static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
616 struct xfrm_usersa_id *p,
5424f32e 617 struct nlattr **attrs,
eb2971b6
MN		 618 int *errp)
619{
620 struct xfrm_state *x = NULL;
6f26b61e 621 struct xfrm_mark m;
eb2971b6 622 int err;
6f26b61e 623 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 624
625 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
626 err = -ESRCH;
6f26b61e 627 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 628 } else {
629 xfrm_address_t *saddr = NULL;
630
35a7aa08 631 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 632 if (!saddr) {
633 err = -EINVAL;
634 goto out;
635 }
636
9abbffee 637 err = -ESRCH;
6f26b61e
JHS		 638 x = xfrm_state_lookup_byaddr(net, mark,
639 &p->daddr, saddr,
221df1ed 640 p->proto, p->family);
eb2971b6
MN		 641 }
642
643 out:
644 if (!x && errp)
645 *errp = err;
646 return x;
647}
648
22e70050 649static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 650 struct nlattr **attrs)
1da177e4 651{
fc34acd3 652 struct net *net = sock_net(skb->sk);
1da177e4 653 struct xfrm_state *x;
eb2971b6 654 int err = -ESRCH;
26b15dad 655 struct km_event c;
7b67c857 656 struct xfrm_usersa_id *p = nlmsg_data(nlh);
c53fa1ed
PM		 657 uid_t loginuid = audit_get_loginuid(current);
658 u32 sessionid = audit_get_sessionid(current);
659 u32 sid;
1da177e4 660
fc34acd3 661 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 662 if (x == NULL)
eb2971b6 663 return err;
1da177e4 664
6f68dc37 665 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 666 goto out;
667
1da177e4 668 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 669 err = -EPERM;
670 goto out;
1da177e4
LT		 671 }
672
26b15dad 673 err = xfrm_state_delete(x);
161a09e7 674
c8c05a8e
CZ		 675 if (err < 0)
676 goto out;
26b15dad
JHS		 677
678 c.seq = nlh->nlmsg_seq;
679 c.pid = nlh->nlmsg_pid;
f60f6b8f 680 c.event = nlh->nlmsg_type;
26b15dad 681 km_state_notify(x, &c);
1da177e4 682
c8c05a8e 683out:
c53fa1ed 684 security_task_getsecid(current, &sid);
2532386f 685 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
c8c05a8e 686 xfrm_state_put(x);
26b15dad 687 return err;
1da177e4
LT		 688}
689
690static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
691{
692 memcpy(&p->id, &x->id, sizeof(p->id));
693 memcpy(&p->sel, &x->sel, sizeof(p->sel));
694 memcpy(&p->lft, &x->lft, sizeof(p->lft));
695 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
696 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 697 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 698 p->mode = x->props.mode;
699 p->replay_window = x->props.replay_window;
700 p->reqid = x->props.reqid;
701 p->family = x->props.family;
702 p->flags = x->props.flags;
703 p->seq = x->km.seq;
704}
705
706struct xfrm_dump_info {
707 struct sk_buff *in_skb;
708 struct sk_buff *out_skb;
709 u32 nlmsg_seq;
710 u16 nlmsg_flags;
1da177e4
LT		 711};
712
c0144bea
TG		 713static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
714{
c0144bea
TG		 715 struct xfrm_user_sec_ctx *uctx;
716 struct nlattr *attr;
68325d3b 717 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 718
719 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
720 if (attr == NULL)
721 return -EMSGSIZE;
722
723 uctx = nla_data(attr);
724 uctx->exttype = XFRMA_SEC_CTX;
725 uctx->len = ctx_size;
726 uctx->ctx_doi = s->ctx_doi;
727 uctx->ctx_alg = s->ctx_alg;
728 uctx->ctx_len = s->ctx_len;
729 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
730
731 return 0;
732}
733
4447bb33
MW		 734static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
735{
736 struct xfrm_algo *algo;
737 struct nlattr *nla;
738
739 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
740 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
741 if (!nla)
742 return -EMSGSIZE;
743
744 algo = nla_data(nla);
4c87308b 745 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 746 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
747 algo->alg_key_len = auth->alg_key_len;
748
749 return 0;
750}
751
68325d3b
HX		 752/* Don't change this without updating xfrm_sa_len! */
753static int copy_to_user_state_extra(struct xfrm_state *x,
754 struct xfrm_usersa_info *p,
755 struct sk_buff *skb)
1da177e4 756{
1d1e34dd 757 int ret = 0;
d0fde795 758
1d1e34dd 759 copy_to_user_state(x, p);
68325d3b 760
1d1e34dd
DM		 761 if (x->coaddr) {
762 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
763 if (ret)
764 goto out;
765 }
766 if (x->lastused) {
767 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
768 if (ret)
769 goto out;
770 }
771 if (x->aead) {
772 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
773 if (ret)
774 goto out;
775 }
776 if (x->aalg) {
777 ret = copy_to_user_auth(x->aalg, skb);
778 if (!ret)
779 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
780 xfrm_alg_auth_len(x->aalg), x->aalg);
781 if (ret)
782 goto out;
783 }
784 if (x->ealg) {
785 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
786 if (ret)
787 goto out;
788 }
789 if (x->calg) {
790 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
791 if (ret)
792 goto out;
793 }
794 if (x->encap) {
795 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
796 if (ret)
797 goto out;
798 }
799 if (x->tfcpad) {
800 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
801 if (ret)
802 goto out;
803 }
804 ret = xfrm_mark_put(skb, &x->mark);
805 if (ret)
806 goto out;
807 if (x->replay_esn) {
808 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
809 xfrm_replay_state_esn_len(x->replay_esn),
810 x->replay_esn);
811 if (ret)
812 goto out;
813 }
814 if (x->security)
815 ret = copy_sec_ctx(x->security, skb);
816out:
817 return ret;
68325d3b
HX		 818}
819
820static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
821{
822 struct xfrm_dump_info *sp = ptr;
823 struct sk_buff *in_skb = sp->in_skb;
824 struct sk_buff *skb = sp->out_skb;
825 struct xfrm_usersa_info *p;
826 struct nlmsghdr *nlh;
827 int err;
828
68325d3b
HX		 829 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
830 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
831 if (nlh == NULL)
832 return -EMSGSIZE;
833
834 p = nlmsg_data(nlh);
835
836 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 837 if (err) {
838 nlmsg_cancel(skb, nlh);
839 return err;
840 }
9825069d 841 nlmsg_end(skb, nlh);
1da177e4 842 return 0;
1da177e4
LT		 843}
844
4c563f76
TT		 845static int xfrm_dump_sa_done(struct netlink_callback *cb)
846{
847 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
848 xfrm_state_walk_done(walk);
849 return 0;
850}
851
1da177e4
LT		 852static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
853{
fc34acd3 854 struct net *net = sock_net(skb->sk);
4c563f76 855 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 856 struct xfrm_dump_info info;
857
4c563f76
TT		 858 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
859 sizeof(cb->args) - sizeof(cb->args[0]));
860
1da177e4
LT		 861 info.in_skb = cb->skb;
862 info.out_skb = skb;
863 info.nlmsg_seq = cb->nlh->nlmsg_seq;
864 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 865
866 if (!cb->args[0]) {
867 cb->args[0] = 1;
868 xfrm_state_walk_init(walk, 0);
869 }
870
fc34acd3 871 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 872
873 return skb->len;
874}
875
876static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
877 struct xfrm_state *x, u32 seq)
878{
879 struct xfrm_dump_info info;
880 struct sk_buff *skb;
864745d2 881 int err;
1da177e4 882
7deb2264 883 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 884 if (!skb)
885 return ERR_PTR(-ENOMEM);
886
1da177e4
LT		 887 info.in_skb = in_skb;
888 info.out_skb = skb;
889 info.nlmsg_seq = seq;
890 info.nlmsg_flags = 0;
1da177e4 891
864745d2
MK		 892 err = dump_one_state(x, 0, &info);
893 if (err) {
1da177e4 894 kfree_skb(skb);
864745d2 895 return ERR_PTR(err);
1da177e4
LT		 896 }
897
898 return skb;
899}
900
7deb2264
TG		 901static inline size_t xfrm_spdinfo_msgsize(void)
902{
903 return NLMSG_ALIGN(4)
904 + nla_total_size(sizeof(struct xfrmu_spdinfo))
905 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
906}
907
e071041b
AD		 908static int build_spdinfo(struct sk_buff *skb, struct net *net,
909 u32 pid, u32 seq, u32 flags)
ecfd6b18 910{
5a6d3416
JHS		 911 struct xfrmk_spdinfo si;
912 struct xfrmu_spdinfo spc;
913 struct xfrmu_spdhinfo sph;
ecfd6b18 914 struct nlmsghdr *nlh;
1d1e34dd 915 int err;
ecfd6b18
JHS		 916 u32 *f;
917
918 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 919 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 920 return -EMSGSIZE;
921
922 f = nlmsg_data(nlh);
923 *f = flags;
e071041b 924 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 925 spc.incnt = si.incnt;
926 spc.outcnt = si.outcnt;
927 spc.fwdcnt = si.fwdcnt;
928 spc.inscnt = si.inscnt;
929 spc.outscnt = si.outscnt;
930 spc.fwdscnt = si.fwdscnt;
931 sph.spdhcnt = si.spdhcnt;
932 sph.spdhmcnt = si.spdhmcnt;
933
1d1e34dd
DM		 934 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
935 if (!err)
936 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
937 if (err) {
938 nlmsg_cancel(skb, nlh);
939 return err;
940 }
ecfd6b18
JHS		 941
942 return nlmsg_end(skb, nlh);
ecfd6b18
JHS		 943}
944
945static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 946 struct nlattr **attrs)
ecfd6b18 947{
a6483b79 948 struct net *net = sock_net(skb->sk);
ecfd6b18 949 struct sk_buff *r_skb;
7b67c857 950 u32 *flags = nlmsg_data(nlh);
ecfd6b18
JHS		 951 u32 spid = NETLINK_CB(skb).pid;
952 u32 seq = nlh->nlmsg_seq;
ecfd6b18 953
7deb2264 954 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 955 if (r_skb == NULL)
956 return -ENOMEM;
957
e071041b 958 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
ecfd6b18
JHS		 959 BUG();
960
a6483b79 961 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
ecfd6b18
JHS		 962}
963
7deb2264
TG		 964static inline size_t xfrm_sadinfo_msgsize(void)
965{
966 return NLMSG_ALIGN(4)
967 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
968 + nla_total_size(4); /* XFRMA_SAD_CNT */
969}
970
e071041b
AD		 971static int build_sadinfo(struct sk_buff *skb, struct net *net,
972 u32 pid, u32 seq, u32 flags)
28d8909b 973{
af11e316
JHS		 974 struct xfrmk_sadinfo si;
975 struct xfrmu_sadhinfo sh;
28d8909b 976 struct nlmsghdr *nlh;
1d1e34dd 977 int err;
28d8909b
JHS		 978 u32 *f;
979
980 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 981 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 982 return -EMSGSIZE;
983
984 f = nlmsg_data(nlh);
985 *f = flags;
e071041b 986 xfrm_sad_getinfo(net, &si);
28d8909b 987
af11e316
JHS		 988 sh.sadhmcnt = si.sadhmcnt;
989 sh.sadhcnt = si.sadhcnt;
990
1d1e34dd
DM		 991 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
992 if (!err)
993 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
994 if (err) {
995 nlmsg_cancel(skb, nlh);
996 return err;
997 }
28d8909b
JHS		 998
999 return nlmsg_end(skb, nlh);
28d8909b
JHS		 1000}
1001
1002static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1003 struct nlattr **attrs)
28d8909b 1004{
a6483b79 1005 struct net *net = sock_net(skb->sk);
28d8909b 1006 struct sk_buff *r_skb;
7b67c857 1007 u32 *flags = nlmsg_data(nlh);
28d8909b
JHS		 1008 u32 spid = NETLINK_CB(skb).pid;
1009 u32 seq = nlh->nlmsg_seq;
28d8909b 1010
7deb2264 1011 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1012 if (r_skb == NULL)
1013 return -ENOMEM;
1014
e071041b 1015 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
28d8909b
JHS		 1016 BUG();
1017
a6483b79 1018 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
28d8909b
JHS		 1019}
1020
22e70050 1021static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1022 struct nlattr **attrs)
1da177e4 1023{
fc34acd3 1024 struct net *net = sock_net(skb->sk);
7b67c857 1025 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1026 struct xfrm_state *x;
1027 struct sk_buff *resp_skb;
eb2971b6 1028 int err = -ESRCH;
1da177e4 1029
fc34acd3 1030 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1031 if (x == NULL)
1032 goto out_noput;
1033
1034 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1035 if (IS_ERR(resp_skb)) {
1036 err = PTR_ERR(resp_skb);
1037 } else {
a6483b79 1038 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 1039 }
1040 xfrm_state_put(x);
1041out_noput:
1042 return err;
1043}
1044
1045static int verify_userspi_info(struct xfrm_userspi_info *p)
1046{
1047 switch (p->info.id.proto) {
1048 case IPPROTO_AH:
1049 case IPPROTO_ESP:
1050 break;
1051
1052 case IPPROTO_COMP:
1053 /* IPCOMP spi is 16-bits. */
1054 if (p->max >= 0x10000)
1055 return -EINVAL;
1056 break;
1057
1058 default:
1059 return -EINVAL;
3ff50b79 1060 }
1da177e4
LT		 1061
1062 if (p->min > p->max)
1063 return -EINVAL;
1064
1065 return 0;
1066}
1067
22e70050 1068static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1069 struct nlattr **attrs)
1da177e4 1070{
fc34acd3 1071 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1072 struct xfrm_state *x;
1073 struct xfrm_userspi_info *p;
1074 struct sk_buff *resp_skb;
1075 xfrm_address_t *daddr;
1076 int family;
1077 int err;
6f26b61e
JHS		 1078 u32 mark;
1079 struct xfrm_mark m;
1da177e4 1080
7b67c857 1081 p = nlmsg_data(nlh);
1da177e4
LT		 1082 err = verify_userspi_info(p);
1083 if (err)
1084 goto out_noput;
1085
1086 family = p->info.family;
1087 daddr = &p->info.id.daddr;
1088
1089 x = NULL;
6f26b61e
JHS		 1090
1091 mark = xfrm_mark_get(attrs, &m);
1da177e4 1092 if (p->info.seq) {
6f26b61e 1093 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1da177e4
LT		 1094 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1095 xfrm_state_put(x);
1096 x = NULL;
1097 }
1098 }
1099
1100 if (!x)
6f26b61e 1101 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1102 p->info.id.proto, daddr,
1103 &p->info.saddr, 1,
1104 family);
1105 err = -ENOENT;
1106 if (x == NULL)
1107 goto out_noput;
1108
658b219e
HX		 1109 err = xfrm_alloc_spi(x, p->min, p->max);
1110 if (err)
1111 goto out;
1da177e4 1112
658b219e 1113 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1114 if (IS_ERR(resp_skb)) {
1115 err = PTR_ERR(resp_skb);
1116 goto out;
1117 }
1118
a6483b79 1119 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 1120
1121out:
1122 xfrm_state_put(x);
1123out_noput:
1124 return err;
1125}
1126
b798a9ed 1127static int verify_policy_dir(u8 dir)
1da177e4
LT		 1128{
1129 switch (dir) {
1130 case XFRM_POLICY_IN:
1131 case XFRM_POLICY_OUT:
1132 case XFRM_POLICY_FWD:
1133 break;
1134
1135 default:
1136 return -EINVAL;
3ff50b79 1137 }
1da177e4
LT		 1138
1139 return 0;
1140}
1141
b798a9ed 1142static int verify_policy_type(u8 type)
f7b6983f
MN		 1143{
1144 switch (type) {
1145 case XFRM_POLICY_TYPE_MAIN:
1146#ifdef CONFIG_XFRM_SUB_POLICY
1147 case XFRM_POLICY_TYPE_SUB:
1148#endif
1149 break;
1150
1151 default:
1152 return -EINVAL;
3ff50b79 1153 }
f7b6983f
MN		 1154
1155 return 0;
1156}
1157
1da177e4
LT		 1158static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1159{
1160 switch (p->share) {
1161 case XFRM_SHARE_ANY:
1162 case XFRM_SHARE_SESSION:
1163 case XFRM_SHARE_USER:
1164 case XFRM_SHARE_UNIQUE:
1165 break;
1166
1167 default:
1168 return -EINVAL;
3ff50b79 1169 }
1da177e4
LT		 1170
1171 switch (p->action) {
1172 case XFRM_POLICY_ALLOW:
1173 case XFRM_POLICY_BLOCK:
1174 break;
1175
1176 default:
1177 return -EINVAL;
3ff50b79 1178 }
1da177e4
LT		 1179
1180 switch (p->sel.family) {
1181 case AF_INET:
1182 break;
1183
1184 case AF_INET6:
dfd56b8b 1185#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1186 break;
1187#else
1188 return -EAFNOSUPPORT;
1189#endif
1190
1191 default:
1192 return -EINVAL;
3ff50b79 1193 }
1da177e4
LT		 1194
1195 return verify_policy_dir(p->dir);
1196}
1197
5424f32e 1198static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1199{
5424f32e 1200 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1201 struct xfrm_user_sec_ctx *uctx;
1202
1203 if (!rt)
1204 return 0;
1205
5424f32e 1206 uctx = nla_data(rt);
03e1ad7b 1207 return security_xfrm_policy_alloc(&pol->security, uctx);
df71837d
TJ		 1208}
1209
1da177e4
LT		 1210static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1211 int nr)
1212{
1213 int i;
1214
1215 xp->xfrm_nr = nr;
1216 for (i = 0; i < nr; i++, ut++) {
1217 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1218
1219 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1220 memcpy(&t->saddr, &ut->saddr,
1221 sizeof(xfrm_address_t));
1222 t->reqid = ut->reqid;
1223 t->mode = ut->mode;
1224 t->share = ut->share;
1225 t->optional = ut->optional;
1226 t->aalgos = ut->aalgos;
1227 t->ealgos = ut->ealgos;
1228 t->calgos = ut->calgos;
c5d18e98
HX		 1229 /* If all masks are ~0, then we allow all algorithms. */
1230 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1231 t->encap_family = ut->family;
1da177e4
LT		 1232 }
1233}
1234
b4ad86bf
DM		 1235static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1236{
1237 int i;
1238
1239 if (nr > XFRM_MAX_DEPTH)
1240 return -EINVAL;
1241
1242 for (i = 0; i < nr; i++) {
1243 /* We never validated the ut->family value, so many
1244 * applications simply leave it at zero. The check was
1245 * never made and ut->family was ignored because all
1246 * templates could be assumed to have the same family as
1247 * the policy itself. Now that we will have ipv4-in-ipv6
1248 * and ipv6-in-ipv4 tunnels, this is no longer true.
1249 */
1250 if (!ut[i].family)
1251 ut[i].family = family;
1252
1253 switch (ut[i].family) {
1254 case AF_INET:
1255 break;
dfd56b8b 1256#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1257 case AF_INET6:
1258 break;
1259#endif
1260 default:
1261 return -EINVAL;
3ff50b79 1262 }
b4ad86bf
DM		 1263 }
1264
1265 return 0;
1266}
1267
5424f32e 1268static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1269{
5424f32e 1270 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1271
1272 if (!rt) {
1273 pol->xfrm_nr = 0;
1274 } else {
5424f32e
TG		 1275 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1276 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1277 int err;
1da177e4 1278
b4ad86bf
DM		 1279 err = validate_tmpl(nr, utmpl, pol->family);
1280 if (err)
1281 return err;
1da177e4 1282
5424f32e 1283 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1284 }
1285 return 0;
1286}
1287
5424f32e 1288static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1289{
5424f32e 1290 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1291 struct xfrm_userpolicy_type *upt;
b798a9ed 1292 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1293 int err;
1294
1295 if (rt) {
5424f32e 1296 upt = nla_data(rt);
f7b6983f
MN		 1297 type = upt->type;
1298 }
1299
1300 err = verify_policy_type(type);
1301 if (err)
1302 return err;
1303
1304 *tp = type;
1305 return 0;
1306}
1307
1da177e4
LT		 1308static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1309{
1310 xp->priority = p->priority;
1311 xp->index = p->index;
1312 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1313 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1314 xp->action = p->action;
1315 xp->flags = p->flags;
1316 xp->family = p->sel.family;
1317 /* XXX xp->share = p->share; */
1318}
1319
1320static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1321{
1322 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1323 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1324 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1325 p->priority = xp->priority;
1326 p->index = xp->index;
1327 p->sel.family = xp->family;
1328 p->dir = dir;
1329 p->action = xp->action;
1330 p->flags = xp->flags;
1331 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1332}
1333
fc34acd3 1334static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1335{
fc34acd3 1336 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1337 int err;
1338
1339 if (!xp) {
1340 *errp = -ENOMEM;
1341 return NULL;
1342 }
1343
1344 copy_from_user_policy(xp, p);
df71837d 1345
35a7aa08 1346 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1347 if (err)
1348 goto error;
1349
35a7aa08
TG		 1350 if (!(err = copy_from_user_tmpl(xp, attrs)))
1351 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1352 if (err)
1353 goto error;
1da177e4 1354
295fae56
JHS		 1355 xfrm_mark_get(attrs, &xp->mark);
1356
1da177e4 1357 return xp;
f7b6983f
MN		 1358 error:
1359 *errp = err;
12a169e7 1360 xp->walk.dead = 1;
64c31b3f 1361 xfrm_policy_destroy(xp);
f7b6983f 1362 return NULL;
1da177e4
LT		 1363}
1364
22e70050 1365static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1366 struct nlattr **attrs)
1da177e4 1367{
fc34acd3 1368 struct net *net = sock_net(skb->sk);
7b67c857 1369 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1370 struct xfrm_policy *xp;
26b15dad 1371 struct km_event c;
1da177e4
LT		 1372 int err;
1373 int excl;
c53fa1ed
PM		 1374 uid_t loginuid = audit_get_loginuid(current);
1375 u32 sessionid = audit_get_sessionid(current);
1376 u32 sid;
1da177e4
LT		 1377
1378 err = verify_newpolicy_info(p);
df71837d
TJ		 1379 if (err)
1380 return err;
35a7aa08 1381 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1382 if (err)
1383 return err;
1384
fc34acd3 1385 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1386 if (!xp)
1387 return err;
1388
25985edc 1389 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1390 * Aha! this is anti-netlink really i.e more pfkey derived
1391 * in netlink excl is a flag and you wouldnt need
1392 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1393 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1394 err = xfrm_policy_insert(p->dir, xp, excl);
c53fa1ed 1395 security_task_getsecid(current, &sid);
2532386f 1396 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 1397
1da177e4 1398 if (err) {
03e1ad7b 1399 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1400 kfree(xp);
1401 return err;
1402 }
1403
f60f6b8f 1404 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1405 c.seq = nlh->nlmsg_seq;
1406 c.pid = nlh->nlmsg_pid;
1407 km_policy_notify(xp, p->dir, &c);
1408
1da177e4
LT		 1409 xfrm_pol_put(xp);
1410
1411 return 0;
1412}
1413
1414static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1415{
1416 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1417 int i;
1418
1419 if (xp->xfrm_nr == 0)
1420 return 0;
1421
1422 for (i = 0; i < xp->xfrm_nr; i++) {
1423 struct xfrm_user_tmpl *up = &vec[i];
1424 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1425
1426 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1427 up->family = kp->encap_family;
1da177e4
LT		 1428 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1429 up->reqid = kp->reqid;
1430 up->mode = kp->mode;
1431 up->share = kp->share;
1432 up->optional = kp->optional;
1433 up->aalgos = kp->aalgos;
1434 up->ealgos = kp->ealgos;
1435 up->calgos = kp->calgos;
1436 }
df71837d 1437
c0144bea
TG		 1438 return nla_put(skb, XFRMA_TMPL,
1439 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1440}
1441
1442static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1443{
1444 if (x->security) {
1445 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1446 }
1447 return 0;
0d681623 1448}
df71837d 1449
0d681623
SH		 1450static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1451{
1d1e34dd 1452 if (xp->security)
0d681623 1453 return copy_sec_ctx(xp->security, skb);
0d681623 1454 return 0;
df71837d 1455}
cfbfd45a
TG		 1456static inline size_t userpolicy_type_attrsize(void)
1457{
1458#ifdef CONFIG_XFRM_SUB_POLICY
1459 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1460#else
1461 return 0;
1462#endif
1463}
df71837d 1464
f7b6983f 1465#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1466static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1467{
c0144bea
TG		 1468 struct xfrm_userpolicy_type upt = {
1469 .type = type,
1470 };
f7b6983f 1471
c0144bea 1472 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1473}
1474
1475#else
b798a9ed 1476static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1477{
1478 return 0;
1479}
1480#endif
1481
1da177e4
LT		 1482static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1483{
1484 struct xfrm_dump_info *sp = ptr;
1485 struct xfrm_userpolicy_info *p;
1486 struct sk_buff *in_skb = sp->in_skb;
1487 struct sk_buff *skb = sp->out_skb;
1488 struct nlmsghdr *nlh;
1d1e34dd 1489 int err;
1da177e4 1490
79b8b7f4
TG		 1491 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1492 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1493 if (nlh == NULL)
1494 return -EMSGSIZE;
1da177e4 1495
7b67c857 1496 p = nlmsg_data(nlh);
1da177e4 1497 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1498 err = copy_to_user_tmpl(xp, skb);
1499 if (!err)
1500 err = copy_to_user_sec_ctx(xp, skb);
1501 if (!err)
1502 err = copy_to_user_policy_type(xp->type, skb);
1503 if (!err)
1504 err = xfrm_mark_put(skb, &xp->mark);
1505 if (err) {
1506 nlmsg_cancel(skb, nlh);
1507 return err;
1508 }
9825069d 1509 nlmsg_end(skb, nlh);
1da177e4 1510 return 0;
1da177e4
LT		 1511}
1512
4c563f76
TT		 1513static int xfrm_dump_policy_done(struct netlink_callback *cb)
1514{
1515 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1516
1517 xfrm_policy_walk_done(walk);
1518 return 0;
1519}
1520
1da177e4
LT		 1521static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1522{
fc34acd3 1523 struct net *net = sock_net(skb->sk);
4c563f76 1524 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1525 struct xfrm_dump_info info;
1526
4c563f76
TT		 1527 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1528 sizeof(cb->args) - sizeof(cb->args[0]));
1529
1da177e4
LT		 1530 info.in_skb = cb->skb;
1531 info.out_skb = skb;
1532 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1533 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1534
1535 if (!cb->args[0]) {
1536 cb->args[0] = 1;
1537 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1538 }
1539
fc34acd3 1540 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1541
1542 return skb->len;
1543}
1544
1545static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1546 struct xfrm_policy *xp,
1547 int dir, u32 seq)
1548{
1549 struct xfrm_dump_info info;
1550 struct sk_buff *skb;
c2546372 1551 int err;
1da177e4 1552
7deb2264 1553 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1554 if (!skb)
1555 return ERR_PTR(-ENOMEM);
1556
1da177e4
LT		 1557 info.in_skb = in_skb;
1558 info.out_skb = skb;
1559 info.nlmsg_seq = seq;
1560 info.nlmsg_flags = 0;
1da177e4 1561
c2546372
MK		 1562 err = dump_one_policy(xp, dir, 0, &info);
1563 if (err) {
1da177e4 1564 kfree_skb(skb);
c2546372 1565 return ERR_PTR(err);
1da177e4
LT		 1566 }
1567
1568 return skb;
1569}
1570
22e70050 1571static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1572 struct nlattr **attrs)
1da177e4 1573{
fc34acd3 1574 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1575 struct xfrm_policy *xp;
1576 struct xfrm_userpolicy_id *p;
b798a9ed 1577 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1578 int err;
26b15dad 1579 struct km_event c;
1da177e4 1580 int delete;
295fae56
JHS		 1581 struct xfrm_mark m;
1582 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1583
7b67c857 1584 p = nlmsg_data(nlh);
1da177e4
LT		 1585 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1586
35a7aa08 1587 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1588 if (err)
1589 return err;
1590
1da177e4
LT		 1591 err = verify_policy_dir(p->dir);
1592 if (err)
1593 return err;
1594
1595 if (p->index)
295fae56 1596 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1597 else {
5424f32e 1598 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1599 struct xfrm_sec_ctx *ctx;
df71837d 1600
35a7aa08 1601 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1602 if (err)
1603 return err;
1604
2c8dd116 1605 ctx = NULL;
df71837d 1606 if (rt) {
5424f32e 1607 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1608
03e1ad7b
PM		 1609 err = security_xfrm_policy_alloc(&ctx, uctx);
1610 if (err)
df71837d 1611 return err;
2c8dd116 1612 }
295fae56 1613 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1614 ctx, delete, &err);
03e1ad7b 1615 security_xfrm_policy_free(ctx);
df71837d 1616 }
1da177e4
LT		 1617 if (xp == NULL)
1618 return -ENOENT;
1619
1620 if (!delete) {
1621 struct sk_buff *resp_skb;
1622
1623 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1624 if (IS_ERR(resp_skb)) {
1625 err = PTR_ERR(resp_skb);
1626 } else {
a6483b79 1627 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
082a1ad5 1628 NETLINK_CB(skb).pid);
1da177e4 1629 }
26b15dad 1630 } else {
c53fa1ed
PM		 1631 uid_t loginuid = audit_get_loginuid(current);
1632 u32 sessionid = audit_get_sessionid(current);
1633 u32 sid;
2532386f 1634
c53fa1ed 1635 security_task_getsecid(current, &sid);
2532386f
EP		 1636 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1637 sid);
13fcfbb0
DM		 1638
1639 if (err != 0)
c8c05a8e 1640 goto out;
13fcfbb0 1641
e7443892 1642 c.data.byid = p->index;
f60f6b8f 1643 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1644 c.seq = nlh->nlmsg_seq;
1645 c.pid = nlh->nlmsg_pid;
1646 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1647 }
1648
c8c05a8e 1649out:
ef41aaa0 1650 xfrm_pol_put(xp);
1da177e4
LT		 1651 return err;
1652}
1653
22e70050 1654static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1655 struct nlattr **attrs)
1da177e4 1656{
fc34acd3 1657 struct net *net = sock_net(skb->sk);
26b15dad 1658 struct km_event c;
7b67c857 1659 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
161a09e7 1660 struct xfrm_audit audit_info;
4aa2e62c 1661 int err;
1da177e4 1662
c53fa1ed
PM		 1663 audit_info.loginuid = audit_get_loginuid(current);
1664 audit_info.sessionid = audit_get_sessionid(current);
1665 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1666 err = xfrm_state_flush(net, p->proto, &audit_info);
9e64cc95
JHS		 1667 if (err) {
1668 if (err == -ESRCH) /* empty table */
1669 return 0;
069c474e 1670 return err;
9e64cc95 1671 }
bf08867f 1672 c.data.proto = p->proto;
f60f6b8f 1673 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1674 c.seq = nlh->nlmsg_seq;
1675 c.pid = nlh->nlmsg_pid;
7067802e 1676 c.net = net;
26b15dad
JHS		 1677 km_state_notify(NULL, &c);
1678
1da177e4
LT		 1679 return 0;
1680}
1681
d8647b79 1682static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1683{
d8647b79
SK		 1684 size_t replay_size = x->replay_esn ?
1685 xfrm_replay_state_esn_len(x->replay_esn) :
1686 sizeof(struct xfrm_replay_state);
1687
7deb2264 1688 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1689 + nla_total_size(replay_size)
7deb2264 1690 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1691 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1692 + nla_total_size(4) /* XFRM_AE_RTHR */
1693 + nla_total_size(4); /* XFRM_AE_ETHR */
1694}
d51d081d 1695
214e005b 1696static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1697{
1698 struct xfrm_aevent_id *id;
1699 struct nlmsghdr *nlh;
1d1e34dd 1700 int err;
d51d081d 1701
79b8b7f4
TG		 1702 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1703 if (nlh == NULL)
1704 return -EMSGSIZE;
d51d081d 1705
7b67c857 1706 id = nlmsg_data(nlh);
2b5f6dcc 1707 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
d51d081d
JHS		 1708 id->sa_id.spi = x->id.spi;
1709 id->sa_id.family = x->props.family;
1710 id->sa_id.proto = x->id.proto;
2b5f6dcc
JHS		 1711 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1712 id->reqid = x->props.reqid;
d51d081d
JHS		 1713 id->flags = c->data.aevent;
1714
d0fde795 1715 if (x->replay_esn) {
1d1e34dd
DM		 1716 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1717 xfrm_replay_state_esn_len(x->replay_esn),
1718 x->replay_esn);
d0fde795 1719 } else {
1d1e34dd
DM		 1720 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1721 &x->replay);
d0fde795 1722 }
1d1e34dd
DM		 1723 if (err)
1724 goto out_cancel;
1725 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1726 if (err)
1727 goto out_cancel;
d51d081d 1728
1d1e34dd
DM		 1729 if (id->flags & XFRM_AE_RTHR) {
1730 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1731 if (err)
1732 goto out_cancel;
1733 }
1734 if (id->flags & XFRM_AE_ETHR) {
1735 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1736 x->replay_maxage * 10 / HZ);
1737 if (err)
1738 goto out_cancel;
1739 }
1740 err = xfrm_mark_put(skb, &x->mark);
1741 if (err)
1742 goto out_cancel;
6f26b61e 1743
9825069d 1744 return nlmsg_end(skb, nlh);
d51d081d 1745
1d1e34dd 1746out_cancel:
9825069d 1747 nlmsg_cancel(skb, nlh);
1d1e34dd 1748 return err;
d51d081d
JHS		 1749}
1750
22e70050 1751static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1752 struct nlattr **attrs)
d51d081d 1753{
fc34acd3 1754 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1755 struct xfrm_state *x;
1756 struct sk_buff *r_skb;
1757 int err;
1758 struct km_event c;
6f26b61e
JHS		 1759 u32 mark;
1760 struct xfrm_mark m;
7b67c857 1761 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1762 struct xfrm_usersa_id *id = &p->sa_id;
1763
6f26b61e
JHS		 1764 mark = xfrm_mark_get(attrs, &m);
1765
1766 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1767 if (x == NULL)
d51d081d 1768 return -ESRCH;
d8647b79
SK		 1769
1770 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1771 if (r_skb == NULL) {
1772 xfrm_state_put(x);
1773 return -ENOMEM;
d51d081d
JHS		 1774 }
1775
1776 /*
1777 * XXX: is this lock really needed - none of the other
1778 * gets lock (the concern is things getting updated
1779 * while we are still reading) - jhs
1780 */
1781 spin_lock_bh(&x->lock);
1782 c.data.aevent = p->flags;
1783 c.seq = nlh->nlmsg_seq;
1784 c.pid = nlh->nlmsg_pid;
1785
1786 if (build_aevent(r_skb, x, &c) < 0)
1787 BUG();
a6483b79 1788 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
d51d081d
JHS		 1789 spin_unlock_bh(&x->lock);
1790 xfrm_state_put(x);
1791 return err;
1792}
1793
22e70050 1794static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1795 struct nlattr **attrs)
d51d081d 1796{
fc34acd3 1797 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1798 struct xfrm_state *x;
1799 struct km_event c;
1800 int err = - EINVAL;
6f26b61e
JHS		 1801 u32 mark = 0;
1802 struct xfrm_mark m;
7b67c857 1803 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1804 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1805 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1806 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1807
d8647b79 1808 if (!lt && !rp && !re)
d51d081d
JHS		 1809 return err;
1810
1811 /* pedantic mode - thou shalt sayeth replaceth */
1812 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1813 return err;
1814
6f26b61e
JHS		 1815 mark = xfrm_mark_get(attrs, &m);
1816
1817 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1818 if (x == NULL)
1819 return -ESRCH;
1820
1821 if (x->km.state != XFRM_STATE_VALID)
1822 goto out;
1823
e2b19125
SK		 1824 err = xfrm_replay_verify_len(x->replay_esn, rp);
1825 if (err)
1826 goto out;
1827
d51d081d 1828 spin_lock_bh(&x->lock);
35a7aa08 1829 xfrm_update_ae_params(x, attrs);
d51d081d 1830 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1831
1832 c.event = nlh->nlmsg_type;
1833 c.seq = nlh->nlmsg_seq;
1834 c.pid = nlh->nlmsg_pid;
1835 c.data.aevent = XFRM_AE_CU;
1836 km_state_notify(x, &c);
1837 err = 0;
1838out:
1839 xfrm_state_put(x);
1840 return err;
1841}
1842
22e70050 1843static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1844 struct nlattr **attrs)
1da177e4 1845{
fc34acd3 1846 struct net *net = sock_net(skb->sk);
f7b6983f 1847 struct km_event c;
b798a9ed 1848 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1849 int err;
161a09e7 1850 struct xfrm_audit audit_info;
f7b6983f 1851
35a7aa08 1852 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1853 if (err)
1854 return err;
26b15dad 1855
c53fa1ed
PM		 1856 audit_info.loginuid = audit_get_loginuid(current);
1857 audit_info.sessionid = audit_get_sessionid(current);
1858 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1859 err = xfrm_policy_flush(net, type, &audit_info);
2f1eb65f
JHS		 1860 if (err) {
1861 if (err == -ESRCH) /* empty table */
1862 return 0;
069c474e 1863 return err;
2f1eb65f
JHS		 1864 }
1865
f7b6983f 1866 c.data.type = type;
f60f6b8f 1867 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1868 c.seq = nlh->nlmsg_seq;
1869 c.pid = nlh->nlmsg_pid;
7067802e 1870 c.net = net;
26b15dad 1871 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1872 return 0;
1873}
1874
22e70050 1875static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1876 struct nlattr **attrs)
6c5c8ca7 1877{
fc34acd3 1878 struct net *net = sock_net(skb->sk);
6c5c8ca7 1879 struct xfrm_policy *xp;
7b67c857 1880 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1881 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1882 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1883 int err = -ENOENT;
295fae56
JHS		 1884 struct xfrm_mark m;
1885 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1886
35a7aa08 1887 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1888 if (err)
1889 return err;
1890
c8bf4d04
TT		 1891 err = verify_policy_dir(p->dir);
1892 if (err)
1893 return err;
1894
6c5c8ca7 1895 if (p->index)
295fae56 1896 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1897 else {
5424f32e 1898 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1899 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1900
35a7aa08 1901 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1902 if (err)
1903 return err;
1904
2c8dd116 1905 ctx = NULL;
6c5c8ca7 1906 if (rt) {
5424f32e 1907 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1908
03e1ad7b
PM		 1909 err = security_xfrm_policy_alloc(&ctx, uctx);
1910 if (err)
6c5c8ca7 1911 return err;
2c8dd116 1912 }
295fae56 1913 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 1914 &p->sel, ctx, 0, &err);
03e1ad7b 1915 security_xfrm_policy_free(ctx);
6c5c8ca7 1916 }
6c5c8ca7 1917 if (xp == NULL)
ef41aaa0 1918 return -ENOENT;
03e1ad7b 1919
ea2dea9d 1920 if (unlikely(xp->walk.dead))
6c5c8ca7 1921 goto out;
6c5c8ca7 1922
6c5c8ca7
JHS		 1923 err = 0;
1924 if (up->hard) {
c53fa1ed
PM		 1925 uid_t loginuid = audit_get_loginuid(current);
1926 u32 sessionid = audit_get_sessionid(current);
1927 u32 sid;
1928
1929 security_task_getsecid(current, &sid);
6c5c8ca7 1930 xfrm_policy_delete(xp, p->dir);
2532386f 1931 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
161a09e7 1932
6c5c8ca7
JHS		 1933 } else {
1934 // reset the timers here?
62db5cfd 1935 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7
JHS		 1936 }
1937 km_policy_expired(xp, p->dir, up->hard, current->pid);
1938
1939out:
1940 xfrm_pol_put(xp);
1941 return err;
1942}
1943
22e70050 1944static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1945 struct nlattr **attrs)
53bc6b4d 1946{
fc34acd3 1947 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 1948 struct xfrm_state *x;
1949 int err;
7b67c857 1950 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 1951 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 1952 struct xfrm_mark m;
928497f0 1953 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 1954
6f26b61e 1955 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 1956
3a765aa5 1957 err = -ENOENT;
53bc6b4d
JHS		 1958 if (x == NULL)
1959 return err;
1960
53bc6b4d 1961 spin_lock_bh(&x->lock);
3a765aa5 1962 err = -EINVAL;
53bc6b4d
JHS		 1963 if (x->km.state != XFRM_STATE_VALID)
1964 goto out;
1965 km_state_expired(x, ue->hard, current->pid);
1966
161a09e7 1967 if (ue->hard) {
c53fa1ed
PM		 1968 uid_t loginuid = audit_get_loginuid(current);
1969 u32 sessionid = audit_get_sessionid(current);
1970 u32 sid;
1971
1972 security_task_getsecid(current, &sid);
53bc6b4d 1973 __xfrm_state_delete(x);
2532386f 1974 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
161a09e7 1975 }
3a765aa5 1976 err = 0;
53bc6b4d
JHS		 1977out:
1978 spin_unlock_bh(&x->lock);
1979 xfrm_state_put(x);
1980 return err;
1981}
1982
22e70050 1983static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1984 struct nlattr **attrs)
980ebd25 1985{
fc34acd3 1986 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 1987 struct xfrm_policy *xp;
1988 struct xfrm_user_tmpl *ut;
1989 int i;
5424f32e 1990 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 1991 struct xfrm_mark mark;
980ebd25 1992
7b67c857 1993 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 1994 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 1995 int err = -ENOMEM;
1996
1997 if (!x)
d8eb9307 1998 goto nomem;
980ebd25 1999
6f26b61e
JHS		 2000 xfrm_mark_get(attrs, &mark);
2001
980ebd25 2002 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 2003 if (err)
2004 goto bad_policy;
980ebd25
JHS		 2005
2006 /* build an XP */
fc34acd3 2007 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2008 if (!xp)
2009 goto free_state;
980ebd25
JHS		 2010
2011 memcpy(&x->id, &ua->id, sizeof(ua->id));
2012 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2013 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2014 xp->mark.m = x->mark.m = mark.m;
2015 xp->mark.v = x->mark.v = mark.v;
5424f32e 2016 ut = nla_data(rt);
980ebd25
JHS		 2017 /* extract the templates and for each call km_key */
2018 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2019 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2020 memcpy(&x->id, &t->id, sizeof(x->id));
2021 x->props.mode = t->mode;
2022 x->props.reqid = t->reqid;
2023 x->props.family = ut->family;
2024 t->aalgos = ua->aalgos;
2025 t->ealgos = ua->ealgos;
2026 t->calgos = ua->calgos;
2027 err = km_query(x, t, xp);
2028
2029 }
2030
2031 kfree(x);
2032 kfree(xp);
2033
2034 return 0;
d8eb9307
IJ		 2035
2036bad_policy:
62db5cfd 2037 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2038free_state:
2039 kfree(x);
2040nomem:
2041 return err;
980ebd25
JHS		 2042}
2043
5c79de6e 2044#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2045static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2046 struct xfrm_kmaddress *k,
5424f32e 2047 struct nlattr **attrs, int *num)
5c79de6e 2048{
5424f32e 2049 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2050 struct xfrm_user_migrate *um;
2051 int i, num_migrate;
2052
13c1d189
AE		 2053 if (k != NULL) {
2054 struct xfrm_user_kmaddress *uk;
2055
2056 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2057 memcpy(&k->local, &uk->local, sizeof(k->local));
2058 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2059 k->family = uk->family;
2060 k->reserved = uk->reserved;
2061 }
2062
5424f32e
TG		 2063 um = nla_data(rt);
2064 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2065
2066 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2067 return -EINVAL;
2068
2069 for (i = 0; i < num_migrate; i++, um++, ma++) {
2070 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2071 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2072 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2073 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2074
2075 ma->proto = um->proto;
2076 ma->mode = um->mode;
2077 ma->reqid = um->reqid;
2078
2079 ma->old_family = um->old_family;
2080 ma->new_family = um->new_family;
2081 }
2082
2083 *num = i;
2084 return 0;
2085}
2086
2087static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2088 struct nlattr **attrs)
5c79de6e 2089{
7b67c857 2090 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2091 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2092 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2093 u8 type;
2094 int err;
2095 int n = 0;
2096
35a7aa08 2097 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2098 return -EINVAL;
5c79de6e 2099
13c1d189
AE		 2100 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2101
5424f32e 2102 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2103 if (err)
2104 return err;
2105
13c1d189 2106 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2107 if (err)
2108 return err;
2109
2110 if (!n)
2111 return 0;
2112
13c1d189 2113 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
5c79de6e
SS		 2114
2115 return 0;
2116}
2117#else
2118static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2119 struct nlattr **attrs)
5c79de6e
SS		 2120{
2121 return -ENOPROTOOPT;
2122}
2123#endif
2124
2125#ifdef CONFIG_XFRM_MIGRATE
183cad12 2126static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2127{
2128 struct xfrm_user_migrate um;
2129
2130 memset(&um, 0, sizeof(um));
2131 um.proto = m->proto;
2132 um.mode = m->mode;
2133 um.reqid = m->reqid;
2134 um.old_family = m->old_family;
2135 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2136 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2137 um.new_family = m->new_family;
2138 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2139 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2140
c0144bea 2141 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2142}
2143
183cad12 2144static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2145{
2146 struct xfrm_user_kmaddress uk;
2147
2148 memset(&uk, 0, sizeof(uk));
2149 uk.family = k->family;
2150 uk.reserved = k->reserved;
2151 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2152 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2153
2154 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2155}
2156
2157static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2158{
2159 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2160 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2161 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2162 + userpolicy_type_attrsize();
7deb2264
TG		 2163}
2164
183cad12
DM		 2165static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2166 int num_migrate, const struct xfrm_kmaddress *k,
2167 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2168{
183cad12 2169 const struct xfrm_migrate *mp;
5c79de6e
SS		 2170 struct xfrm_userpolicy_id *pol_id;
2171 struct nlmsghdr *nlh;
1d1e34dd 2172 int i, err;
5c79de6e 2173
79b8b7f4
TG		 2174 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2175 if (nlh == NULL)
2176 return -EMSGSIZE;
5c79de6e 2177
7b67c857 2178 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2179 /* copy data from selector, dir, and type to the pol_id */
2180 memset(pol_id, 0, sizeof(*pol_id));
2181 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2182 pol_id->dir = dir;
2183
1d1e34dd
DM		 2184 if (k != NULL) {
2185 err = copy_to_user_kmaddress(k, skb);
2186 if (err)
2187 goto out_cancel;
2188 }
2189 err = copy_to_user_policy_type(type, skb);
2190 if (err)
2191 goto out_cancel;
5c79de6e 2192 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2193 err = copy_to_user_migrate(mp, skb);
2194 if (err)
2195 goto out_cancel;
5c79de6e
SS		 2196 }
2197
9825069d 2198 return nlmsg_end(skb, nlh);
1d1e34dd
DM		 2199
2200out_cancel:
9825069d 2201 nlmsg_cancel(skb, nlh);
1d1e34dd 2202 return err;
5c79de6e
SS		 2203}
2204
183cad12
DM		 2205static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2206 const struct xfrm_migrate *m, int num_migrate,
2207 const struct xfrm_kmaddress *k)
5c79de6e 2208{
a6483b79 2209 struct net *net = &init_net;
5c79de6e 2210 struct sk_buff *skb;
5c79de6e 2211
13c1d189 2212 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2213 if (skb == NULL)
2214 return -ENOMEM;
2215
2216 /* build migrate */
13c1d189 2217 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2218 BUG();
2219
a6483b79 2220 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
5c79de6e
SS		 2221}
2222#else
183cad12
DM		 2223static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2224 const struct xfrm_migrate *m, int num_migrate,
2225 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2226{
2227 return -ENOPROTOOPT;
2228}
2229#endif
d51d081d 2230
a7bd9a45 2231#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2232
2233static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2234 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2235 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2236 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2237 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2238 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2239 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2240 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2241 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2242 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2243 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2244 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2245 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2246 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2247 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2248 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2249 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2250 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2251 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 2252 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2253 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2254};
2255
492b558b
TG		 2256#undef XMSGSIZE
2257
cf5cb79f 2258static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2259 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2260 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2261 [XFRMA_LASTUSED] = { .type = NLA_U64},
2262 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2263 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2264 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2265 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2266 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2267 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2268 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2269 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2270 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2271 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2272 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2273 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2274 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2275 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2276 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2277 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2278 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2279 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2280 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2281 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
cf5cb79f
TG		 2282};
2283
1da177e4 2284static struct xfrm_link {
5424f32e 2285 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2286 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2287 int (*done)(struct netlink_callback *);
492b558b
TG		 2288} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2289 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2290 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2291 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2292 .dump = xfrm_dump_sa,
2293 .done = xfrm_dump_sa_done },
492b558b
TG		 2294 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2295 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2296 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2297 .dump = xfrm_dump_policy,
2298 .done = xfrm_dump_policy_done },
492b558b 2299 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2300 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2301 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2302 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2303 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2304 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2305 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2306 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2307 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2308 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2309 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2310 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 2311 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2312};
2313
1d00a4eb 2314static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2315{
a6483b79 2316 struct net *net = sock_net(skb->sk);
35a7aa08 2317 struct nlattr *attrs[XFRMA_MAX+1];
1da177e4 2318 struct xfrm_link *link;
a7bd9a45 2319 int type, err;
1da177e4 2320
1da177e4 2321 type = nlh->nlmsg_type;
1da177e4 2322 if (type > XFRM_MSG_MAX)
1d00a4eb 2323 return -EINVAL;
1da177e4
LT		 2324
2325 type -= XFRM_MSG_BASE;
2326 link = &xfrm_dispatch[type];
2327
2328 /* All operations require privileges, even GET */
fd778461 2329 if (!capable(CAP_NET_ADMIN))
1d00a4eb 2330 return -EPERM;
1da177e4 2331
492b558b
TG		 2332 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2333 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2334 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2335 if (link->dump == NULL)
1d00a4eb 2336 return -EINVAL;
88fc2c84 2337
80d326fa
PNA		 2338 {
2339 struct netlink_dump_control c = {
2340 .dump = link->dump,
2341 .done = link->done,
2342 };
2343 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2344 }
1da177e4
LT		 2345 }
2346
35a7aa08 2347 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 2348 xfrma_policy);
a7bd9a45
TG		 2349 if (err < 0)
2350 return err;
1da177e4
LT		 2351
2352 if (link->doit == NULL)
1d00a4eb 2353 return -EINVAL;
1da177e4 2354
5424f32e 2355 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2356}
2357
cd40b7d3 2358static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2359{
cd40b7d3
DL		 2360 mutex_lock(&xfrm_cfg_mutex);
2361 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2362 mutex_unlock(&xfrm_cfg_mutex);
1da177e4
LT		 2363}
2364
7deb2264
TG		 2365static inline size_t xfrm_expire_msgsize(void)
2366{
6f26b61e
JHS		 2367 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2368 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2369}
2370
214e005b 2371static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2372{
2373 struct xfrm_user_expire *ue;
2374 struct nlmsghdr *nlh;
1d1e34dd 2375 int err;
1da177e4 2376
79b8b7f4
TG		 2377 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2378 if (nlh == NULL)
2379 return -EMSGSIZE;
1da177e4 2380
7b67c857 2381 ue = nlmsg_data(nlh);
1da177e4 2382 copy_to_user_state(x, &ue->state);
d51d081d 2383 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2384
1d1e34dd
DM		 2385 err = xfrm_mark_put(skb, &x->mark);
2386 if (err)
2387 return err;
6f26b61e 2388
9825069d 2389 return nlmsg_end(skb, nlh);
1da177e4
LT		 2390}
2391
214e005b 2392static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2393{
fc34acd3 2394 struct net *net = xs_net(x);
1da177e4
LT		 2395 struct sk_buff *skb;
2396
7deb2264 2397 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2398 if (skb == NULL)
2399 return -ENOMEM;
2400
6f26b61e
JHS		 2401 if (build_expire(skb, x, c) < 0) {
2402 kfree_skb(skb);
2403 return -EMSGSIZE;
2404 }
1da177e4 2405
a6483b79 2406 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2407}
2408
214e005b 2409static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2410{
fc34acd3 2411 struct net *net = xs_net(x);
d51d081d 2412 struct sk_buff *skb;
d51d081d 2413
d8647b79 2414 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2415 if (skb == NULL)
2416 return -ENOMEM;
2417
2418 if (build_aevent(skb, x, c) < 0)
2419 BUG();
2420
a6483b79 2421 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
d51d081d
JHS		 2422}
2423
214e005b 2424static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2425{
7067802e 2426 struct net *net = c->net;
26b15dad
JHS		 2427 struct xfrm_usersa_flush *p;
2428 struct nlmsghdr *nlh;
2429 struct sk_buff *skb;
7deb2264 2430 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2431
7deb2264 2432 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2433 if (skb == NULL)
2434 return -ENOMEM;
26b15dad 2435
79b8b7f4
TG		 2436 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2437 if (nlh == NULL) {
2438 kfree_skb(skb);
2439 return -EMSGSIZE;
2440 }
26b15dad 2441
7b67c857 2442 p = nlmsg_data(nlh);
bf08867f 2443 p->proto = c->data.proto;
26b15dad 2444
9825069d 2445 nlmsg_end(skb, nlh);
26b15dad 2446
a6483b79 2447 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2448}
2449
7deb2264 2450static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2451{
7deb2264 2452 size_t l = 0;
1a6509d9
HX		 2453 if (x->aead)
2454 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2455 if (x->aalg) {
2456 l += nla_total_size(sizeof(struct xfrm_algo) +
2457 (x->aalg->alg_key_len + 7) / 8);
2458 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2459 }
26b15dad 2460 if (x->ealg)
0f99be0d 2461 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2462 if (x->calg)
7deb2264 2463 l += nla_total_size(sizeof(*x->calg));
26b15dad 2464 if (x->encap)
7deb2264 2465 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2466 if (x->tfcpad)
2467 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2468 if (x->replay_esn)
2469 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
68325d3b
HX		 2470 if (x->security)
2471 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2472 x->security->ctx_len);
2473 if (x->coaddr)
2474 l += nla_total_size(sizeof(*x->coaddr));
2475
d26f3984
HX		 2476 /* Must count x->lastused as it may become non-zero behind our back. */
2477 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2478
2479 return l;
2480}
2481
214e005b 2482static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2483{
fc34acd3 2484 struct net *net = xs_net(x);
26b15dad 2485 struct xfrm_usersa_info *p;
0603eac0 2486 struct xfrm_usersa_id *id;
26b15dad
JHS		 2487 struct nlmsghdr *nlh;
2488 struct sk_buff *skb;
26b15dad 2489 int len = xfrm_sa_len(x);
1d1e34dd 2490 int headlen, err;
0603eac0
HX		 2491
2492 headlen = sizeof(*p);
2493 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2494 len += nla_total_size(headlen);
0603eac0 2495 headlen = sizeof(*id);
6f26b61e 2496 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2497 }
7deb2264 2498 len += NLMSG_ALIGN(headlen);
26b15dad 2499
7deb2264 2500 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2501 if (skb == NULL)
2502 return -ENOMEM;
26b15dad 2503
79b8b7f4 2504 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
1d1e34dd 2505 err = -EMSGSIZE;
79b8b7f4 2506 if (nlh == NULL)
1d1e34dd 2507 goto out_free_skb;
26b15dad 2508
7b67c857 2509 p = nlmsg_data(nlh);
0603eac0 2510 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2511 struct nlattr *attr;
2512
7b67c857 2513 id = nlmsg_data(nlh);
0603eac0
HX		 2514 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2515 id->spi = x->id.spi;
2516 id->family = x->props.family;
2517 id->proto = x->id.proto;
2518
c0144bea 2519 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2520 err = -EMSGSIZE;
c0144bea 2521 if (attr == NULL)
1d1e34dd 2522 goto out_free_skb;
c0144bea
TG		 2523
2524 p = nla_data(attr);
0603eac0 2525 }
1d1e34dd
DM		 2526 err = copy_to_user_state_extra(x, p, skb);
2527 if (err)
2528 goto out_free_skb;
26b15dad 2529
9825069d 2530 nlmsg_end(skb, nlh);
26b15dad 2531
a6483b79 2532 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad 2533
1d1e34dd 2534out_free_skb:
26b15dad 2535 kfree_skb(skb);
1d1e34dd 2536 return err;
26b15dad
JHS		 2537}
2538
214e005b 2539static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2540{
2541
2542 switch (c->event) {
f60f6b8f 2543 case XFRM_MSG_EXPIRE:
26b15dad 2544 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2545 case XFRM_MSG_NEWAE:
2546 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2547 case XFRM_MSG_DELSA:
2548 case XFRM_MSG_UPDSA:
2549 case XFRM_MSG_NEWSA:
26b15dad 2550 return xfrm_notify_sa(x, c);
f60f6b8f 2551 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2552 return xfrm_notify_sa_flush(c);
2553 default:
62db5cfd 2554 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2555 c->event);
2556 break;
26b15dad
JHS		 2557 }
2558
2559 return 0;
2560
2561}
2562
7deb2264
TG		 2563static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2564 struct xfrm_policy *xp)
2565{
2566 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2567 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2568 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2569 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2570 + userpolicy_type_attrsize();
2571}
2572
1da177e4
LT		 2573static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2574 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2575 int dir)
2576{
1d1e34dd 2577 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2578 struct xfrm_user_acquire *ua;
2579 struct nlmsghdr *nlh;
1d1e34dd 2580 int err;
1da177e4 2581
79b8b7f4
TG		 2582 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2583 if (nlh == NULL)
2584 return -EMSGSIZE;
1da177e4 2585
7b67c857 2586 ua = nlmsg_data(nlh);
1da177e4
LT		 2587 memcpy(&ua->id, &x->id, sizeof(ua->id));
2588 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2589 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2590 copy_to_user_policy(xp, &ua->policy, dir);
2591 ua->aalgos = xt->aalgos;
2592 ua->ealgos = xt->ealgos;
2593 ua->calgos = xt->calgos;
2594 ua->seq = x->km.seq = seq;
2595
1d1e34dd
DM		 2596 err = copy_to_user_tmpl(xp, skb);
2597 if (!err)
2598 err = copy_to_user_state_sec_ctx(x, skb);
2599 if (!err)
2600 err = copy_to_user_policy_type(xp->type, skb);
2601 if (!err)
2602 err = xfrm_mark_put(skb, &xp->mark);
2603 if (err) {
2604 nlmsg_cancel(skb, nlh);
2605 return err;
2606 }
1da177e4 2607
9825069d 2608 return nlmsg_end(skb, nlh);
1da177e4
LT		 2609}
2610
2611static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2612 struct xfrm_policy *xp, int dir)
2613{
a6483b79 2614 struct net *net = xs_net(x);
1da177e4 2615 struct sk_buff *skb;
1da177e4 2616
7deb2264 2617 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2618 if (skb == NULL)
2619 return -ENOMEM;
2620
2621 if (build_acquire(skb, x, xt, xp, dir) < 0)
2622 BUG();
2623
a6483b79 2624 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2625}
2626
2627/* User gives us xfrm_user_policy_info followed by an array of 0
2628 * or more templates.
2629 */
cb969f07 2630static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2631 u8 *data, int len, int *dir)
2632{
fc34acd3 2633 struct net *net = sock_net(sk);
1da177e4
LT		 2634 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2635 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2636 struct xfrm_policy *xp;
2637 int nr;
2638
cb969f07 2639 switch (sk->sk_family) {
1da177e4
LT		 2640 case AF_INET:
2641 if (opt != IP_XFRM_POLICY) {
2642 *dir = -EOPNOTSUPP;
2643 return NULL;
2644 }
2645 break;
dfd56b8b 2646#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2647 case AF_INET6:
2648 if (opt != IPV6_XFRM_POLICY) {
2649 *dir = -EOPNOTSUPP;
2650 return NULL;
2651 }
2652 break;
2653#endif
2654 default:
2655 *dir = -EINVAL;
2656 return NULL;
2657 }
2658
2659 *dir = -EINVAL;
2660
2661 if (len < sizeof(*p) ||
2662 verify_newpolicy_info(p))
2663 return NULL;
2664
2665 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2666 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2667 return NULL;
2668
a4f1bac6
HX		 2669 if (p->dir > XFRM_POLICY_OUT)
2670 return NULL;
2671
2f09a4d5 2672 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2673 if (xp == NULL) {
2674 *dir = -ENOBUFS;
2675 return NULL;
2676 }
2677
2678 copy_from_user_policy(xp, p);
f7b6983f 2679 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2680 copy_templates(xp, ut, nr);
2681
2682 *dir = p->dir;
2683
2684 return xp;
2685}
2686
7deb2264
TG		 2687static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2688{
2689 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2690 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2691 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2692 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2693 + userpolicy_type_attrsize();
2694}
2695
1da177e4 2696static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2697 int dir, const struct km_event *c)
1da177e4
LT		 2698{
2699 struct xfrm_user_polexpire *upe;
d51d081d 2700 int hard = c->data.hard;
1d1e34dd
DM		 2701 struct nlmsghdr *nlh;
2702 int err;
1da177e4 2703
79b8b7f4
TG		 2704 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2705 if (nlh == NULL)
2706 return -EMSGSIZE;
1da177e4 2707
7b67c857 2708 upe = nlmsg_data(nlh);
1da177e4 2709 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2710 err = copy_to_user_tmpl(xp, skb);
2711 if (!err)
2712 err = copy_to_user_sec_ctx(xp, skb);
2713 if (!err)
2714 err = copy_to_user_policy_type(xp->type, skb);
2715 if (!err)
2716 err = xfrm_mark_put(skb, &xp->mark);
2717 if (err) {
2718 nlmsg_cancel(skb, nlh);
2719 return err;
2720 }
1da177e4
LT		 2721 upe->hard = !!hard;
2722
9825069d 2723 return nlmsg_end(skb, nlh);
1da177e4
LT		 2724}
2725
214e005b 2726static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2727{
fc34acd3 2728 struct net *net = xp_net(xp);
1da177e4 2729 struct sk_buff *skb;
1da177e4 2730
7deb2264 2731 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2732 if (skb == NULL)
2733 return -ENOMEM;
2734
d51d081d 2735 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2736 BUG();
2737
a6483b79 2738 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2739}
2740
214e005b 2741static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2742{
1d1e34dd 2743 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2744 struct net *net = xp_net(xp);
26b15dad 2745 struct xfrm_userpolicy_info *p;
0603eac0 2746 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2747 struct nlmsghdr *nlh;
2748 struct sk_buff *skb;
1d1e34dd 2749 int headlen, err;
0603eac0
HX		 2750
2751 headlen = sizeof(*p);
2752 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2753 len += nla_total_size(headlen);
0603eac0
HX		 2754 headlen = sizeof(*id);
2755 }
cfbfd45a 2756 len += userpolicy_type_attrsize();
295fae56 2757 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2758 len += NLMSG_ALIGN(headlen);
26b15dad 2759
7deb2264 2760 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2761 if (skb == NULL)
2762 return -ENOMEM;
26b15dad 2763
79b8b7f4 2764 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
1d1e34dd 2765 err = -EMSGSIZE;
79b8b7f4 2766 if (nlh == NULL)
1d1e34dd 2767 goto out_free_skb;
26b15dad 2768
7b67c857 2769 p = nlmsg_data(nlh);
0603eac0 2770 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2771 struct nlattr *attr;
2772
7b67c857 2773 id = nlmsg_data(nlh);
0603eac0
HX		 2774 memset(id, 0, sizeof(*id));
2775 id->dir = dir;
2776 if (c->data.byid)
2777 id->index = xp->index;
2778 else
2779 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2780
c0144bea 2781 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2782 err = -EMSGSIZE;
c0144bea 2783 if (attr == NULL)
1d1e34dd 2784 goto out_free_skb;
c0144bea
TG		 2785
2786 p = nla_data(attr);
0603eac0 2787 }
26b15dad 2788
26b15dad 2789 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2790 err = copy_to_user_tmpl(xp, skb);
2791 if (!err)
2792 err = copy_to_user_policy_type(xp->type, skb);
2793 if (!err)
2794 err = xfrm_mark_put(skb, &xp->mark);
2795 if (err)
2796 goto out_free_skb;
295fae56 2797
9825069d 2798 nlmsg_end(skb, nlh);
26b15dad 2799
a6483b79 2800 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2801
1d1e34dd 2802out_free_skb:
26b15dad 2803 kfree_skb(skb);
1d1e34dd 2804 return err;
26b15dad
JHS		 2805}
2806
214e005b 2807static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2808{
7067802e 2809 struct net *net = c->net;
26b15dad
JHS		 2810 struct nlmsghdr *nlh;
2811 struct sk_buff *skb;
1d1e34dd 2812 int err;
26b15dad 2813
7deb2264 2814 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2815 if (skb == NULL)
2816 return -ENOMEM;
26b15dad 2817
79b8b7f4 2818 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2819 err = -EMSGSIZE;
79b8b7f4 2820 if (nlh == NULL)
1d1e34dd
DM		 2821 goto out_free_skb;
2822 err = copy_to_user_policy_type(c->data.type, skb);
2823 if (err)
2824 goto out_free_skb;
26b15dad 2825
9825069d 2826 nlmsg_end(skb, nlh);
26b15dad 2827
a6483b79 2828 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2829
1d1e34dd 2830out_free_skb:
26b15dad 2831 kfree_skb(skb);
1d1e34dd 2832 return err;
26b15dad
JHS		 2833}
2834
214e005b 2835static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2836{
2837
2838 switch (c->event) {
f60f6b8f
HX		 2839 case XFRM_MSG_NEWPOLICY:
2840 case XFRM_MSG_UPDPOLICY:
2841 case XFRM_MSG_DELPOLICY:
26b15dad 2842 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2843 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2844 return xfrm_notify_policy_flush(c);
f60f6b8f 2845 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2846 return xfrm_exp_policy_notify(xp, dir, c);
2847 default:
62db5cfd 2848 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2849 c->event);
26b15dad
JHS		 2850 }
2851
2852 return 0;
2853
2854}
2855
7deb2264
TG		 2856static inline size_t xfrm_report_msgsize(void)
2857{
2858 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2859}
2860
97a64b45
MN		 2861static int build_report(struct sk_buff *skb, u8 proto,
2862 struct xfrm_selector *sel, xfrm_address_t *addr)
2863{
2864 struct xfrm_user_report *ur;
2865 struct nlmsghdr *nlh;
97a64b45 2866
79b8b7f4
TG		 2867 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2868 if (nlh == NULL)
2869 return -EMSGSIZE;
97a64b45 2870
7b67c857 2871 ur = nlmsg_data(nlh);
97a64b45
MN		 2872 ur->proto = proto;
2873 memcpy(&ur->sel, sel, sizeof(ur->sel));
2874
1d1e34dd
DM		 2875 if (addr) {
2876 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2877 if (err) {
2878 nlmsg_cancel(skb, nlh);
2879 return err;
2880 }
2881 }
9825069d 2882 return nlmsg_end(skb, nlh);
97a64b45
MN		 2883}
2884
db983c11
AD		 2885static int xfrm_send_report(struct net *net, u8 proto,
2886 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2887{
2888 struct sk_buff *skb;
97a64b45 2889
7deb2264 2890 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2891 if (skb == NULL)
2892 return -ENOMEM;
2893
2894 if (build_report(skb, proto, sel, addr) < 0)
2895 BUG();
2896
a6483b79 2897 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
97a64b45
MN		 2898}
2899
3a2dfbe8
MW		 2900static inline size_t xfrm_mapping_msgsize(void)
2901{
2902 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2903}
2904
2905static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2906 xfrm_address_t *new_saddr, __be16 new_sport)
2907{
2908 struct xfrm_user_mapping *um;
2909 struct nlmsghdr *nlh;
2910
2911 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2912 if (nlh == NULL)
2913 return -EMSGSIZE;
2914
2915 um = nlmsg_data(nlh);
2916
2917 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2918 um->id.spi = x->id.spi;
2919 um->id.family = x->props.family;
2920 um->id.proto = x->id.proto;
2921 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2922 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2923 um->new_sport = new_sport;
2924 um->old_sport = x->encap->encap_sport;
2925 um->reqid = x->props.reqid;
2926
2927 return nlmsg_end(skb, nlh);
2928}
2929
2930static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2931 __be16 sport)
2932{
a6483b79 2933 struct net *net = xs_net(x);
3a2dfbe8
MW		 2934 struct sk_buff *skb;
2935
2936 if (x->id.proto != IPPROTO_ESP)
2937 return -EINVAL;
2938
2939 if (!x->encap)
2940 return -EINVAL;
2941
2942 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2943 if (skb == NULL)
2944 return -ENOMEM;
2945
2946 if (build_mapping(skb, x, ipaddr, sport) < 0)
2947 BUG();
2948
a6483b79 2949 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
3a2dfbe8
MW		 2950}
2951
1da177e4
LT		 2952static struct xfrm_mgr netlink_mgr = {
2953 .id = "netlink",
2954 .notify = xfrm_send_state_notify,
2955 .acquire = xfrm_send_acquire,
2956 .compile_policy = xfrm_compile_policy,
2957 .notify_policy = xfrm_send_policy_notify,
97a64b45 2958 .report = xfrm_send_report,
5c79de6e 2959 .migrate = xfrm_send_migrate,
3a2dfbe8 2960 .new_mapping = xfrm_send_mapping,
1da177e4
LT		 2961};
2962
a6483b79 2963static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 2964{
be33690d 2965 struct sock *nlsk;
a31f2d17
PNA		 2966 struct netlink_kernel_cfg cfg = {
2967 .groups = XFRMNLGRP_MAX,
2968 .input = xfrm_netlink_rcv,
2969 };
be33690d 2970
a31f2d17 2971 nlsk = netlink_kernel_create(net, NETLINK_XFRM, THIS_MODULE, &cfg);
be33690d 2972 if (nlsk == NULL)
1da177e4 2973 return -ENOMEM;
d79d792e 2974 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 2975 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 2976 return 0;
2977}
2978
d79d792e 2979static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 2980{
d79d792e
EB		 2981 struct net *net;
2982 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 2983 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 2984 synchronize_net();
2985 list_for_each_entry(net, net_exit_list, exit_list)
2986 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 2987}
2988
a6483b79 2989static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 2990 .init = xfrm_user_net_init,
2991 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 2992};
2993
2994static int __init xfrm_user_init(void)
2995{
2996 int rv;
2997
2998 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2999
3000 rv = register_pernet_subsys(&xfrm_user_net_ops);
3001 if (rv < 0)
3002 return rv;
3003 rv = xfrm_register_km(&netlink_mgr);
3004 if (rv < 0)
3005 unregister_pernet_subsys(&xfrm_user_net_ops);
3006 return rv;
3007}
3008
3009static void __exit xfrm_user_exit(void)
3010{
3011 xfrm_unregister_km(&netlink_mgr);
3012 unregister_pernet_subsys(&xfrm_user_net_ops);
3013}
3014
1da177e4
LT		 3015module_init(xfrm_user_init);
3016module_exit(xfrm_user_exit);
3017MODULE_LICENSE("GPL");
4fdb3bb7 3018MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3019
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