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Merge branch 'for-3.15' of git://linux-nfs.org/~bfields/linux
[linux-2.6-block.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
5424f32e 35static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 36{
5424f32e 37 struct nlattr *rt = attrs[type];
1da177e4
LT		 38 struct xfrm_algo *algp;
39
40 if (!rt)
41 return 0;
42
5424f32e 43 algp = nla_data(rt);
0f99be0d 44 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 45 return -EINVAL;
46
1da177e4
LT		 47 switch (type) {
48 case XFRMA_ALG_AUTH:
1da177e4 49 case XFRMA_ALG_CRYPT:
1da177e4 50 case XFRMA_ALG_COMP:
1da177e4
LT		 51 break;
52
53 default:
54 return -EINVAL;
3ff50b79 55 }
1da177e4
LT		 56
57 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
58 return 0;
59}
60
4447bb33
MW		 61static int verify_auth_trunc(struct nlattr **attrs)
62{
63 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
64 struct xfrm_algo_auth *algp;
65
66 if (!rt)
67 return 0;
68
69 algp = nla_data(rt);
70 if (nla_len(rt) < xfrm_alg_auth_len(algp))
71 return -EINVAL;
72
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 return 0;
75}
76
1a6509d9
HX		 77static int verify_aead(struct nlattr **attrs)
78{
79 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
80 struct xfrm_algo_aead *algp;
81
82 if (!rt)
83 return 0;
84
85 algp = nla_data(rt);
86 if (nla_len(rt) < aead_len(algp))
87 return -EINVAL;
88
89 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
90 return 0;
91}
92
5424f32e 93static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 94 xfrm_address_t **addrp)
95{
5424f32e 96 struct nlattr *rt = attrs[type];
eb2971b6 97
cf5cb79f 98 if (rt && addrp)
5424f32e 99 *addrp = nla_data(rt);
eb2971b6 100}
df71837d 101
5424f32e 102static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 103{
5424f32e 104 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 105 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 106
107 if (!rt)
108 return 0;
109
5424f32e 110 uctx = nla_data(rt);
cf5cb79f 111 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 112 return -EINVAL;
113
114 return 0;
115}
116
d8647b79
SK		 117static inline int verify_replay(struct xfrm_usersa_info *p,
118 struct nlattr **attrs)
119{
120 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
ecd79187 121 struct xfrm_replay_state_esn *rs;
d8647b79 122
ecd79187
MK		 123 if (p->flags & XFRM_STATE_ESN) {
124 if (!rt)
125 return -EINVAL;
126
127 rs = nla_data(rt);
128
129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 return -EINVAL;
131
132 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133 nla_len(rt) != sizeof(*rs))
134 return -EINVAL;
135 }
7833aa05 136
d8647b79
SK		 137 if (!rt)
138 return 0;
139
01714109
FD		 140 /* As only ESP and AH support ESN feature. */
141 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
02aadf72
SK		 142 return -EINVAL;
143
d8647b79
SK		 144 if (p->replay_window != 0)
145 return -EINVAL;
146
147 return 0;
148}
df71837d 149
1da177e4 150static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 151 struct nlattr **attrs)
1da177e4
LT		 152{
153 int err;
154
155 err = -EINVAL;
156 switch (p->family) {
157 case AF_INET:
158 break;
159
160 case AF_INET6:
dfd56b8b 161#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 162 break;
163#else
164 err = -EAFNOSUPPORT;
165 goto out;
166#endif
167
168 default:
169 goto out;
3ff50b79 170 }
1da177e4
LT		 171
172 err = -EINVAL;
173 switch (p->id.proto) {
174 case IPPROTO_AH:
4447bb33
MW		 175 if ((!attrs[XFRMA_ALG_AUTH] &&
176 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 177 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 178 attrs[XFRMA_ALG_CRYPT] ||
35d2856b 179 attrs[XFRMA_ALG_COMP] ||
ea9884b3
FD		 180 attrs[XFRMA_TFCPAD] ||
181 (ntohl(p->id.spi) >= 0x10000))
182
1da177e4
LT		 183 goto out;
184 break;
185
186 case IPPROTO_ESP:
1a6509d9
HX		 187 if (attrs[XFRMA_ALG_COMP])
188 goto out;
189 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 190 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 191 !attrs[XFRMA_ALG_CRYPT] &&
192 !attrs[XFRMA_ALG_AEAD])
193 goto out;
194 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 195 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 196 attrs[XFRMA_ALG_CRYPT]) &&
197 attrs[XFRMA_ALG_AEAD])
1da177e4 198 goto out;
35d2856b
MW		 199 if (attrs[XFRMA_TFCPAD] &&
200 p->mode != XFRM_MODE_TUNNEL)
201 goto out;
1da177e4
LT		 202 break;
203
204 case IPPROTO_COMP:
35a7aa08 205 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 206 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 207 attrs[XFRMA_ALG_AUTH] ||
4447bb33 208 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b
MW		 209 attrs[XFRMA_ALG_CRYPT] ||
210 attrs[XFRMA_TFCPAD])
1da177e4
LT		 211 goto out;
212 break;
213
dfd56b8b 214#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 215 case IPPROTO_DSTOPTS:
216 case IPPROTO_ROUTING:
35a7aa08
TG		 217 if (attrs[XFRMA_ALG_COMP] ||
218 attrs[XFRMA_ALG_AUTH] ||
4447bb33 219 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9 220 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 221 attrs[XFRMA_ALG_CRYPT] ||
222 attrs[XFRMA_ENCAP] ||
223 attrs[XFRMA_SEC_CTX] ||
35d2856b 224 attrs[XFRMA_TFCPAD] ||
35a7aa08 225 !attrs[XFRMA_COADDR])
e23c7194
MN		 226 goto out;
227 break;
228#endif
229
1da177e4
LT		 230 default:
231 goto out;
3ff50b79 232 }
1da177e4 233
1a6509d9
HX		 234 if ((err = verify_aead(attrs)))
235 goto out;
4447bb33
MW		 236 if ((err = verify_auth_trunc(attrs)))
237 goto out;
35a7aa08 238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 239 goto out;
35a7aa08 240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 241 goto out;
35a7aa08 242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 243 goto out;
35a7aa08 244 if ((err = verify_sec_ctx_len(attrs)))
df71837d 245 goto out;
d8647b79
SK		 246 if ((err = verify_replay(p, attrs)))
247 goto out;
1da177e4
LT		 248
249 err = -EINVAL;
250 switch (p->mode) {
7e49e6de
MN		 251 case XFRM_MODE_TRANSPORT:
252 case XFRM_MODE_TUNNEL:
060f02a3 253 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 254 case XFRM_MODE_BEET:
1da177e4
LT		 255 break;
256
257 default:
258 goto out;
3ff50b79 259 }
1da177e4
LT		 260
261 err = 0;
262
263out:
264 return err;
265}
266
267static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
6f2f19ed 268 struct xfrm_algo_desc *(*get_byname)(const char *, int),
5424f32e 269 struct nlattr *rta)
1da177e4 270{
1da177e4
LT		 271 struct xfrm_algo *p, *ualg;
272 struct xfrm_algo_desc *algo;
273
274 if (!rta)
275 return 0;
276
5424f32e 277 ualg = nla_data(rta);
1da177e4
LT		 278
279 algo = get_byname(ualg->alg_name, 1);
280 if (!algo)
281 return -ENOSYS;
282 *props = algo->desc.sadb_alg_id;
283
0f99be0d 284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 285 if (!p)
286 return -ENOMEM;
287
04ff1260 288 strcpy(p->alg_name, algo->name);
1da177e4
LT		 289 *algpp = p;
290 return 0;
291}
292
4447bb33
MW		 293static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
294 struct nlattr *rta)
295{
296 struct xfrm_algo *ualg;
297 struct xfrm_algo_auth *p;
298 struct xfrm_algo_desc *algo;
299
300 if (!rta)
301 return 0;
302
303 ualg = nla_data(rta);
304
305 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
306 if (!algo)
307 return -ENOSYS;
308 *props = algo->desc.sadb_alg_id;
309
310 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
311 if (!p)
312 return -ENOMEM;
313
314 strcpy(p->alg_name, algo->name);
315 p->alg_key_len = ualg->alg_key_len;
316 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
317 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
318
319 *algpp = p;
320 return 0;
321}
322
323static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
324 struct nlattr *rta)
325{
326 struct xfrm_algo_auth *p, *ualg;
327 struct xfrm_algo_desc *algo;
328
329 if (!rta)
330 return 0;
331
332 ualg = nla_data(rta);
333
334 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
335 if (!algo)
336 return -ENOSYS;
fa6dd8a2
ND		 337 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
338 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 339 return -EINVAL;
340 *props = algo->desc.sadb_alg_id;
341
342 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
343 if (!p)
344 return -ENOMEM;
345
346 strcpy(p->alg_name, algo->name);
347 if (!p->alg_trunc_len)
348 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
349
350 *algpp = p;
351 return 0;
352}
353
1a6509d9
HX		 354static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
355 struct nlattr *rta)
356{
357 struct xfrm_algo_aead *p, *ualg;
358 struct xfrm_algo_desc *algo;
359
360 if (!rta)
361 return 0;
362
363 ualg = nla_data(rta);
364
365 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
366 if (!algo)
367 return -ENOSYS;
368 *props = algo->desc.sadb_alg_id;
369
370 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
371 if (!p)
372 return -ENOMEM;
373
374 strcpy(p->alg_name, algo->name);
375 *algpp = p;
376 return 0;
377}
378
e2b19125
SK		 379static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
380 struct nlattr *rp)
381{
382 struct xfrm_replay_state_esn *up;
ecd79187 383 int ulen;
e2b19125
SK		 384
385 if (!replay_esn || !rp)
386 return 0;
387
388 up = nla_data(rp);
ecd79187 389 ulen = xfrm_replay_state_esn_len(up);
e2b19125 390
ecd79187 391 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
e2b19125
SK		 392 return -EINVAL;
393
394 return 0;
395}
396
d8647b79
SK		 397static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
398 struct xfrm_replay_state_esn **preplay_esn,
399 struct nlattr *rta)
400{
401 struct xfrm_replay_state_esn *p, *pp, *up;
ecd79187 402 int klen, ulen;
d8647b79
SK		 403
404 if (!rta)
405 return 0;
406
407 up = nla_data(rta);
ecd79187
MK		 408 klen = xfrm_replay_state_esn_len(up);
409 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
d8647b79 410
ecd79187 411 p = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 412 if (!p)
413 return -ENOMEM;
414
ecd79187 415 pp = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 416 if (!pp) {
417 kfree(p);
418 return -ENOMEM;
419 }
420
ecd79187
MK		 421 memcpy(p, up, ulen);
422 memcpy(pp, up, ulen);
423
d8647b79
SK		 424 *replay_esn = p;
425 *preplay_esn = pp;
426
427 return 0;
428}
429
661697f7 430static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 431{
df71837d
TJ		 432 int len = 0;
433
434 if (xfrm_ctx) {
435 len += sizeof(struct xfrm_user_sec_ctx);
436 len += xfrm_ctx->ctx_len;
437 }
438 return len;
439}
440
1da177e4
LT		 441static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
442{
443 memcpy(&x->id, &p->id, sizeof(x->id));
444 memcpy(&x->sel, &p->sel, sizeof(x->sel));
445 memcpy(&x->lft, &p->lft, sizeof(x->lft));
446 x->props.mode = p->mode;
33fce60d
FD		 447 x->props.replay_window = min_t(unsigned int, p->replay_window,
448 sizeof(x->replay.bitmap) * 8);
1da177e4
LT		 449 x->props.reqid = p->reqid;
450 x->props.family = p->family;
54489c14 451 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 452 x->props.flags = p->flags;
196b0036 453
ccf9b3b8 454 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 455 x->sel.family = p->family;
1da177e4
LT		 456}
457
d51d081d
JHS		 458/*
459 * someday when pfkey also has support, we could have the code
460 * somehow made shareable and move it to xfrm_state.c - JHS
461 *
462*/
e3ac104d
MK		 463static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
464 int update_esn)
d51d081d 465{
5424f32e 466 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
e3ac104d 467 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
5424f32e
TG		 468 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
469 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
470 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 471
d8647b79
SK		 472 if (re) {
473 struct xfrm_replay_state_esn *replay_esn;
474 replay_esn = nla_data(re);
475 memcpy(x->replay_esn, replay_esn,
476 xfrm_replay_state_esn_len(replay_esn));
477 memcpy(x->preplay_esn, replay_esn,
478 xfrm_replay_state_esn_len(replay_esn));
479 }
480
d51d081d
JHS		 481 if (rp) {
482 struct xfrm_replay_state *replay;
5424f32e 483 replay = nla_data(rp);
d51d081d
JHS		 484 memcpy(&x->replay, replay, sizeof(*replay));
485 memcpy(&x->preplay, replay, sizeof(*replay));
486 }
487
488 if (lt) {
489 struct xfrm_lifetime_cur *ltime;
5424f32e 490 ltime = nla_data(lt);
d51d081d
JHS		 491 x->curlft.bytes = ltime->bytes;
492 x->curlft.packets = ltime->packets;
493 x->curlft.add_time = ltime->add_time;
494 x->curlft.use_time = ltime->use_time;
495 }
496
cf5cb79f 497 if (et)
5424f32e 498 x->replay_maxage = nla_get_u32(et);
d51d081d 499
cf5cb79f 500 if (rt)
5424f32e 501 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 502}
503
fc34acd3
AD		 504static struct xfrm_state *xfrm_state_construct(struct net *net,
505 struct xfrm_usersa_info *p,
5424f32e 506 struct nlattr **attrs,
1da177e4
LT		 507 int *errp)
508{
fc34acd3 509 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 510 int err = -ENOMEM;
511
512 if (!x)
513 goto error_no_put;
514
515 copy_from_user_state(x, p);
516
a947b0a9
ND		 517 if (attrs[XFRMA_SA_EXTRA_FLAGS])
518 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
519
1a6509d9
HX		 520 if ((err = attach_aead(&x->aead, &x->props.ealgo,
521 attrs[XFRMA_ALG_AEAD])))
522 goto error;
4447bb33
MW		 523 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
524 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 525 goto error;
4447bb33
MW		 526 if (!x->props.aalgo) {
527 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
528 attrs[XFRMA_ALG_AUTH])))
529 goto error;
530 }
1da177e4
LT		 531 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
532 xfrm_ealg_get_byname,
35a7aa08 533 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 534 goto error;
535 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
536 xfrm_calg_get_byname,
35a7aa08 537 attrs[XFRMA_ALG_COMP])))
1da177e4 538 goto error;
fd21150a
TG		 539
540 if (attrs[XFRMA_ENCAP]) {
541 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
542 sizeof(*x->encap), GFP_KERNEL);
543 if (x->encap == NULL)
544 goto error;
545 }
546
35d2856b
MW		 547 if (attrs[XFRMA_TFCPAD])
548 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
549
fd21150a
TG		 550 if (attrs[XFRMA_COADDR]) {
551 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
552 sizeof(*x->coaddr), GFP_KERNEL);
553 if (x->coaddr == NULL)
554 goto error;
555 }
556
6f26b61e
JHS		 557 xfrm_mark_get(attrs, &x->mark);
558
a454f0cc 559 err = __xfrm_init_state(x, false);
1da177e4
LT		 560 if (err)
561 goto error;
562
fd21150a
TG		 563 if (attrs[XFRMA_SEC_CTX] &&
564 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 565 goto error;
566
d8647b79
SK		 567 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
568 attrs[XFRMA_REPLAY_ESN_VAL])))
569 goto error;
570
1da177e4 571 x->km.seq = p->seq;
b27aeadb 572 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 573 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 574 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 575
9fdc4883
SK		 576 if ((err = xfrm_init_replay(x)))
577 goto error;
d51d081d 578
9fdc4883 579 /* override default values from above */
e3ac104d 580 xfrm_update_ae_params(x, attrs, 0);
1da177e4
LT		 581
582 return x;
583
584error:
585 x->km.state = XFRM_STATE_DEAD;
586 xfrm_state_put(x);
587error_no_put:
588 *errp = err;
589 return NULL;
590}
591
22e70050 592static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 593 struct nlattr **attrs)
1da177e4 594{
fc34acd3 595 struct net *net = sock_net(skb->sk);
7b67c857 596 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 597 struct xfrm_state *x;
598 int err;
26b15dad 599 struct km_event c;
e1760bd5 600 kuid_t loginuid = audit_get_loginuid(current);
4440e854 601 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed 602 u32 sid;
1da177e4 603
35a7aa08 604 err = verify_newsa_info(p, attrs);
1da177e4
LT		 605 if (err)
606 return err;
607
fc34acd3 608 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 609 if (!x)
610 return err;
611
26b15dad 612 xfrm_state_hold(x);
1da177e4
LT		 613 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
614 err = xfrm_state_add(x);
615 else
616 err = xfrm_state_update(x);
617
c53fa1ed 618 security_task_getsecid(current, &sid);
2532386f 619 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 620
1da177e4
LT		 621 if (err < 0) {
622 x->km.state = XFRM_STATE_DEAD;
21380b81 623 __xfrm_state_put(x);
7d6dfe1f 624 goto out;
1da177e4
LT		 625 }
626
26b15dad 627 c.seq = nlh->nlmsg_seq;
15e47304 628 c.portid = nlh->nlmsg_pid;
f60f6b8f 629 c.event = nlh->nlmsg_type;
26b15dad
JHS		 630
631 km_state_notify(x, &c);
7d6dfe1f 632out:
26b15dad 633 xfrm_state_put(x);
1da177e4
LT		 634 return err;
635}
636
fc34acd3
AD		 637static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
638 struct xfrm_usersa_id *p,
5424f32e 639 struct nlattr **attrs,
eb2971b6
MN		 640 int *errp)
641{
642 struct xfrm_state *x = NULL;
6f26b61e 643 struct xfrm_mark m;
eb2971b6 644 int err;
6f26b61e 645 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 646
647 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
648 err = -ESRCH;
6f26b61e 649 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 650 } else {
651 xfrm_address_t *saddr = NULL;
652
35a7aa08 653 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 654 if (!saddr) {
655 err = -EINVAL;
656 goto out;
657 }
658
9abbffee 659 err = -ESRCH;
6f26b61e
JHS		 660 x = xfrm_state_lookup_byaddr(net, mark,
661 &p->daddr, saddr,
221df1ed 662 p->proto, p->family);
eb2971b6
MN		 663 }
664
665 out:
666 if (!x && errp)
667 *errp = err;
668 return x;
669}
670
22e70050 671static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 672 struct nlattr **attrs)
1da177e4 673{
fc34acd3 674 struct net *net = sock_net(skb->sk);
1da177e4 675 struct xfrm_state *x;
eb2971b6 676 int err = -ESRCH;
26b15dad 677 struct km_event c;
7b67c857 678 struct xfrm_usersa_id *p = nlmsg_data(nlh);
e1760bd5 679 kuid_t loginuid = audit_get_loginuid(current);
4440e854 680 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed 681 u32 sid;
1da177e4 682
fc34acd3 683 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 684 if (x == NULL)
eb2971b6 685 return err;
1da177e4 686
6f68dc37 687 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 688 goto out;
689
1da177e4 690 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 691 err = -EPERM;
692 goto out;
1da177e4
LT		 693 }
694
26b15dad 695 err = xfrm_state_delete(x);
161a09e7 696
c8c05a8e
CZ		 697 if (err < 0)
698 goto out;
26b15dad
JHS		 699
700 c.seq = nlh->nlmsg_seq;
15e47304 701 c.portid = nlh->nlmsg_pid;
f60f6b8f 702 c.event = nlh->nlmsg_type;
26b15dad 703 km_state_notify(x, &c);
1da177e4 704
c8c05a8e 705out:
c53fa1ed 706 security_task_getsecid(current, &sid);
2532386f 707 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
c8c05a8e 708 xfrm_state_put(x);
26b15dad 709 return err;
1da177e4
LT		 710}
711
712static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
713{
f778a636 714 memset(p, 0, sizeof(*p));
1da177e4
LT		 715 memcpy(&p->id, &x->id, sizeof(p->id));
716 memcpy(&p->sel, &x->sel, sizeof(p->sel));
717 memcpy(&p->lft, &x->lft, sizeof(p->lft));
718 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
719 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 720 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 721 p->mode = x->props.mode;
722 p->replay_window = x->props.replay_window;
723 p->reqid = x->props.reqid;
724 p->family = x->props.family;
725 p->flags = x->props.flags;
726 p->seq = x->km.seq;
727}
728
729struct xfrm_dump_info {
730 struct sk_buff *in_skb;
731 struct sk_buff *out_skb;
732 u32 nlmsg_seq;
733 u16 nlmsg_flags;
1da177e4
LT		 734};
735
c0144bea
TG		 736static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
737{
c0144bea
TG		 738 struct xfrm_user_sec_ctx *uctx;
739 struct nlattr *attr;
68325d3b 740 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 741
742 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
743 if (attr == NULL)
744 return -EMSGSIZE;
745
746 uctx = nla_data(attr);
747 uctx->exttype = XFRMA_SEC_CTX;
748 uctx->len = ctx_size;
749 uctx->ctx_doi = s->ctx_doi;
750 uctx->ctx_alg = s->ctx_alg;
751 uctx->ctx_len = s->ctx_len;
752 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
753
754 return 0;
755}
756
4447bb33
MW		 757static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
758{
759 struct xfrm_algo *algo;
760 struct nlattr *nla;
761
762 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
763 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
764 if (!nla)
765 return -EMSGSIZE;
766
767 algo = nla_data(nla);
4c87308b 768 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 769 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
770 algo->alg_key_len = auth->alg_key_len;
771
772 return 0;
773}
774
68325d3b
HX		 775/* Don't change this without updating xfrm_sa_len! */
776static int copy_to_user_state_extra(struct xfrm_state *x,
777 struct xfrm_usersa_info *p,
778 struct sk_buff *skb)
1da177e4 779{
1d1e34dd 780 int ret = 0;
d0fde795 781
1d1e34dd 782 copy_to_user_state(x, p);
68325d3b 783
a947b0a9
ND		 784 if (x->props.extra_flags) {
785 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
786 x->props.extra_flags);
787 if (ret)
788 goto out;
789 }
790
1d1e34dd
DM		 791 if (x->coaddr) {
792 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
793 if (ret)
794 goto out;
795 }
796 if (x->lastused) {
797 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
798 if (ret)
799 goto out;
800 }
801 if (x->aead) {
802 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
803 if (ret)
804 goto out;
805 }
806 if (x->aalg) {
807 ret = copy_to_user_auth(x->aalg, skb);
808 if (!ret)
809 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
810 xfrm_alg_auth_len(x->aalg), x->aalg);
811 if (ret)
812 goto out;
813 }
814 if (x->ealg) {
815 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
816 if (ret)
817 goto out;
818 }
819 if (x->calg) {
820 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
821 if (ret)
822 goto out;
823 }
824 if (x->encap) {
825 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
826 if (ret)
827 goto out;
828 }
829 if (x->tfcpad) {
830 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
831 if (ret)
832 goto out;
833 }
834 ret = xfrm_mark_put(skb, &x->mark);
835 if (ret)
836 goto out;
837 if (x->replay_esn) {
838 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
839 xfrm_replay_state_esn_len(x->replay_esn),
840 x->replay_esn);
841 if (ret)
842 goto out;
843 }
844 if (x->security)
845 ret = copy_sec_ctx(x->security, skb);
846out:
847 return ret;
68325d3b
HX		 848}
849
850static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
851{
852 struct xfrm_dump_info *sp = ptr;
853 struct sk_buff *in_skb = sp->in_skb;
854 struct sk_buff *skb = sp->out_skb;
855 struct xfrm_usersa_info *p;
856 struct nlmsghdr *nlh;
857 int err;
858
15e47304 859 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
68325d3b
HX		 860 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
861 if (nlh == NULL)
862 return -EMSGSIZE;
863
864 p = nlmsg_data(nlh);
865
866 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 867 if (err) {
868 nlmsg_cancel(skb, nlh);
869 return err;
870 }
9825069d 871 nlmsg_end(skb, nlh);
1da177e4 872 return 0;
1da177e4
LT		 873}
874
4c563f76
TT		 875static int xfrm_dump_sa_done(struct netlink_callback *cb)
876{
877 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
283bc9f3
FD		 878 struct sock *sk = cb->skb->sk;
879 struct net *net = sock_net(sk);
880
881 xfrm_state_walk_done(walk, net);
4c563f76
TT		 882 return 0;
883}
884
d3623099 885static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1da177e4
LT		 886static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
887{
fc34acd3 888 struct net *net = sock_net(skb->sk);
4c563f76 889 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 890 struct xfrm_dump_info info;
891
4c563f76
TT		 892 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
893 sizeof(cb->args) - sizeof(cb->args[0]));
894
1da177e4
LT		 895 info.in_skb = cb->skb;
896 info.out_skb = skb;
897 info.nlmsg_seq = cb->nlh->nlmsg_seq;
898 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 899
900 if (!cb->args[0]) {
d3623099 901 struct nlattr *attrs[XFRMA_MAX+1];
870a2df4 902 struct xfrm_address_filter *filter = NULL;
d3623099
ND		 903 u8 proto = 0;
904 int err;
905
4c563f76 906 cb->args[0] = 1;
d3623099
ND		 907
908 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
909 xfrma_policy);
910 if (err < 0)
911 return err;
912
870a2df4 913 if (attrs[XFRMA_ADDRESS_FILTER]) {
d3623099
ND		 914 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
915 if (filter == NULL)
916 return -ENOMEM;
917
870a2df4 918 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
d3623099
ND		 919 sizeof(*filter));
920 }
921
922 if (attrs[XFRMA_PROTO])
923 proto = nla_get_u8(attrs[XFRMA_PROTO]);
924
925 xfrm_state_walk_init(walk, proto, filter);
4c563f76
TT		 926 }
927
fc34acd3 928 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 929
930 return skb->len;
931}
932
933static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
934 struct xfrm_state *x, u32 seq)
935{
936 struct xfrm_dump_info info;
937 struct sk_buff *skb;
864745d2 938 int err;
1da177e4 939
7deb2264 940 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 941 if (!skb)
942 return ERR_PTR(-ENOMEM);
943
1da177e4
LT		 944 info.in_skb = in_skb;
945 info.out_skb = skb;
946 info.nlmsg_seq = seq;
947 info.nlmsg_flags = 0;
1da177e4 948
864745d2
MK		 949 err = dump_one_state(x, 0, &info);
950 if (err) {
1da177e4 951 kfree_skb(skb);
864745d2 952 return ERR_PTR(err);
1da177e4
LT		 953 }
954
955 return skb;
956}
957
7deb2264
TG		 958static inline size_t xfrm_spdinfo_msgsize(void)
959{
960 return NLMSG_ALIGN(4)
961 + nla_total_size(sizeof(struct xfrmu_spdinfo))
962 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
963}
964
e071041b 965static int build_spdinfo(struct sk_buff *skb, struct net *net,
15e47304 966 u32 portid, u32 seq, u32 flags)
ecfd6b18 967{
5a6d3416
JHS		 968 struct xfrmk_spdinfo si;
969 struct xfrmu_spdinfo spc;
970 struct xfrmu_spdhinfo sph;
ecfd6b18 971 struct nlmsghdr *nlh;
1d1e34dd 972 int err;
ecfd6b18
JHS		 973 u32 *f;
974
15e47304 975 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 976 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 977 return -EMSGSIZE;
978
979 f = nlmsg_data(nlh);
980 *f = flags;
e071041b 981 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 982 spc.incnt = si.incnt;
983 spc.outcnt = si.outcnt;
984 spc.fwdcnt = si.fwdcnt;
985 spc.inscnt = si.inscnt;
986 spc.outscnt = si.outscnt;
987 spc.fwdscnt = si.fwdscnt;
988 sph.spdhcnt = si.spdhcnt;
989 sph.spdhmcnt = si.spdhmcnt;
990
1d1e34dd
DM		 991 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
992 if (!err)
993 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
994 if (err) {
995 nlmsg_cancel(skb, nlh);
996 return err;
997 }
ecfd6b18
JHS		 998
999 return nlmsg_end(skb, nlh);
ecfd6b18
JHS		 1000}
1001
1002static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1003 struct nlattr **attrs)
ecfd6b18 1004{
a6483b79 1005 struct net *net = sock_net(skb->sk);
ecfd6b18 1006 struct sk_buff *r_skb;
7b67c857 1007 u32 *flags = nlmsg_data(nlh);
15e47304 1008 u32 sportid = NETLINK_CB(skb).portid;
ecfd6b18 1009 u32 seq = nlh->nlmsg_seq;
ecfd6b18 1010
7deb2264 1011 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 1012 if (r_skb == NULL)
1013 return -ENOMEM;
1014
15e47304 1015 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
ecfd6b18
JHS		 1016 BUG();
1017
15e47304 1018 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
ecfd6b18
JHS		 1019}
1020
7deb2264
TG		 1021static inline size_t xfrm_sadinfo_msgsize(void)
1022{
1023 return NLMSG_ALIGN(4)
1024 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1025 + nla_total_size(4); /* XFRMA_SAD_CNT */
1026}
1027
e071041b 1028static int build_sadinfo(struct sk_buff *skb, struct net *net,
15e47304 1029 u32 portid, u32 seq, u32 flags)
28d8909b 1030{
af11e316
JHS		 1031 struct xfrmk_sadinfo si;
1032 struct xfrmu_sadhinfo sh;
28d8909b 1033 struct nlmsghdr *nlh;
1d1e34dd 1034 int err;
28d8909b
JHS		 1035 u32 *f;
1036
15e47304 1037 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 1038 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 1039 return -EMSGSIZE;
1040
1041 f = nlmsg_data(nlh);
1042 *f = flags;
e071041b 1043 xfrm_sad_getinfo(net, &si);
28d8909b 1044
af11e316
JHS		 1045 sh.sadhmcnt = si.sadhmcnt;
1046 sh.sadhcnt = si.sadhcnt;
1047
1d1e34dd
DM		 1048 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1049 if (!err)
1050 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1051 if (err) {
1052 nlmsg_cancel(skb, nlh);
1053 return err;
1054 }
28d8909b
JHS		 1055
1056 return nlmsg_end(skb, nlh);
28d8909b
JHS		 1057}
1058
1059static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1060 struct nlattr **attrs)
28d8909b 1061{
a6483b79 1062 struct net *net = sock_net(skb->sk);
28d8909b 1063 struct sk_buff *r_skb;
7b67c857 1064 u32 *flags = nlmsg_data(nlh);
15e47304 1065 u32 sportid = NETLINK_CB(skb).portid;
28d8909b 1066 u32 seq = nlh->nlmsg_seq;
28d8909b 1067
7deb2264 1068 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1069 if (r_skb == NULL)
1070 return -ENOMEM;
1071
15e47304 1072 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
28d8909b
JHS		 1073 BUG();
1074
15e47304 1075 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
28d8909b
JHS		 1076}
1077
22e70050 1078static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1079 struct nlattr **attrs)
1da177e4 1080{
fc34acd3 1081 struct net *net = sock_net(skb->sk);
7b67c857 1082 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1083 struct xfrm_state *x;
1084 struct sk_buff *resp_skb;
eb2971b6 1085 int err = -ESRCH;
1da177e4 1086
fc34acd3 1087 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1088 if (x == NULL)
1089 goto out_noput;
1090
1091 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1092 if (IS_ERR(resp_skb)) {
1093 err = PTR_ERR(resp_skb);
1094 } else {
15e47304 1095 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1096 }
1097 xfrm_state_put(x);
1098out_noput:
1099 return err;
1100}
1101
22e70050 1102static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1103 struct nlattr **attrs)
1da177e4 1104{
fc34acd3 1105 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1106 struct xfrm_state *x;
1107 struct xfrm_userspi_info *p;
1108 struct sk_buff *resp_skb;
1109 xfrm_address_t *daddr;
1110 int family;
1111 int err;
6f26b61e
JHS		 1112 u32 mark;
1113 struct xfrm_mark m;
1da177e4 1114
7b67c857 1115 p = nlmsg_data(nlh);
776e9dd9 1116 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1da177e4
LT		 1117 if (err)
1118 goto out_noput;
1119
1120 family = p->info.family;
1121 daddr = &p->info.id.daddr;
1122
1123 x = NULL;
6f26b61e
JHS		 1124
1125 mark = xfrm_mark_get(attrs, &m);
1da177e4 1126 if (p->info.seq) {
6f26b61e 1127 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
70e94e66 1128 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1da177e4
LT		 1129 xfrm_state_put(x);
1130 x = NULL;
1131 }
1132 }
1133
1134 if (!x)
6f26b61e 1135 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1136 p->info.id.proto, daddr,
1137 &p->info.saddr, 1,
1138 family);
1139 err = -ENOENT;
1140 if (x == NULL)
1141 goto out_noput;
1142
658b219e
HX		 1143 err = xfrm_alloc_spi(x, p->min, p->max);
1144 if (err)
1145 goto out;
1da177e4 1146
658b219e 1147 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1148 if (IS_ERR(resp_skb)) {
1149 err = PTR_ERR(resp_skb);
1150 goto out;
1151 }
1152
15e47304 1153 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1154
1155out:
1156 xfrm_state_put(x);
1157out_noput:
1158 return err;
1159}
1160
b798a9ed 1161static int verify_policy_dir(u8 dir)
1da177e4
LT		 1162{
1163 switch (dir) {
1164 case XFRM_POLICY_IN:
1165 case XFRM_POLICY_OUT:
1166 case XFRM_POLICY_FWD:
1167 break;
1168
1169 default:
1170 return -EINVAL;
3ff50b79 1171 }
1da177e4
LT		 1172
1173 return 0;
1174}
1175
b798a9ed 1176static int verify_policy_type(u8 type)
f7b6983f
MN		 1177{
1178 switch (type) {
1179 case XFRM_POLICY_TYPE_MAIN:
1180#ifdef CONFIG_XFRM_SUB_POLICY
1181 case XFRM_POLICY_TYPE_SUB:
1182#endif
1183 break;
1184
1185 default:
1186 return -EINVAL;
3ff50b79 1187 }
f7b6983f
MN		 1188
1189 return 0;
1190}
1191
1da177e4
LT		 1192static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1193{
e682adf0
FD		 1194 int ret;
1195
1da177e4
LT		 1196 switch (p->share) {
1197 case XFRM_SHARE_ANY:
1198 case XFRM_SHARE_SESSION:
1199 case XFRM_SHARE_USER:
1200 case XFRM_SHARE_UNIQUE:
1201 break;
1202
1203 default:
1204 return -EINVAL;
3ff50b79 1205 }
1da177e4
LT		 1206
1207 switch (p->action) {
1208 case XFRM_POLICY_ALLOW:
1209 case XFRM_POLICY_BLOCK:
1210 break;
1211
1212 default:
1213 return -EINVAL;
3ff50b79 1214 }
1da177e4
LT		 1215
1216 switch (p->sel.family) {
1217 case AF_INET:
1218 break;
1219
1220 case AF_INET6:
dfd56b8b 1221#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1222 break;
1223#else
1224 return -EAFNOSUPPORT;
1225#endif
1226
1227 default:
1228 return -EINVAL;
3ff50b79 1229 }
1da177e4 1230
e682adf0
FD		 1231 ret = verify_policy_dir(p->dir);
1232 if (ret)
1233 return ret;
1234 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1235 return -EINVAL;
1236
1237 return 0;
1da177e4
LT		 1238}
1239
5424f32e 1240static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1241{
5424f32e 1242 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1243 struct xfrm_user_sec_ctx *uctx;
1244
1245 if (!rt)
1246 return 0;
1247
5424f32e 1248 uctx = nla_data(rt);
52a4c640 1249 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
df71837d
TJ		 1250}
1251
1da177e4
LT		 1252static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1253 int nr)
1254{
1255 int i;
1256
1257 xp->xfrm_nr = nr;
1258 for (i = 0; i < nr; i++, ut++) {
1259 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1260
1261 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1262 memcpy(&t->saddr, &ut->saddr,
1263 sizeof(xfrm_address_t));
1264 t->reqid = ut->reqid;
1265 t->mode = ut->mode;
1266 t->share = ut->share;
1267 t->optional = ut->optional;
1268 t->aalgos = ut->aalgos;
1269 t->ealgos = ut->ealgos;
1270 t->calgos = ut->calgos;
c5d18e98
HX		 1271 /* If all masks are ~0, then we allow all algorithms. */
1272 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1273 t->encap_family = ut->family;
1da177e4
LT		 1274 }
1275}
1276
b4ad86bf
DM		 1277static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1278{
1279 int i;
1280
1281 if (nr > XFRM_MAX_DEPTH)
1282 return -EINVAL;
1283
1284 for (i = 0; i < nr; i++) {
1285 /* We never validated the ut->family value, so many
1286 * applications simply leave it at zero. The check was
1287 * never made and ut->family was ignored because all
1288 * templates could be assumed to have the same family as
1289 * the policy itself. Now that we will have ipv4-in-ipv6
1290 * and ipv6-in-ipv4 tunnels, this is no longer true.
1291 */
1292 if (!ut[i].family)
1293 ut[i].family = family;
1294
1295 switch (ut[i].family) {
1296 case AF_INET:
1297 break;
dfd56b8b 1298#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1299 case AF_INET6:
1300 break;
1301#endif
1302 default:
1303 return -EINVAL;
3ff50b79 1304 }
b4ad86bf
DM		 1305 }
1306
1307 return 0;
1308}
1309
5424f32e 1310static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1311{
5424f32e 1312 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1313
1314 if (!rt) {
1315 pol->xfrm_nr = 0;
1316 } else {
5424f32e
TG		 1317 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1318 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1319 int err;
1da177e4 1320
b4ad86bf
DM		 1321 err = validate_tmpl(nr, utmpl, pol->family);
1322 if (err)
1323 return err;
1da177e4 1324
5424f32e 1325 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1326 }
1327 return 0;
1328}
1329
5424f32e 1330static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1331{
5424f32e 1332 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1333 struct xfrm_userpolicy_type *upt;
b798a9ed 1334 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1335 int err;
1336
1337 if (rt) {
5424f32e 1338 upt = nla_data(rt);
f7b6983f
MN		 1339 type = upt->type;
1340 }
1341
1342 err = verify_policy_type(type);
1343 if (err)
1344 return err;
1345
1346 *tp = type;
1347 return 0;
1348}
1349
1da177e4
LT		 1350static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1351{
1352 xp->priority = p->priority;
1353 xp->index = p->index;
1354 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1355 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1356 xp->action = p->action;
1357 xp->flags = p->flags;
1358 xp->family = p->sel.family;
1359 /* XXX xp->share = p->share; */
1360}
1361
1362static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1363{
7b789836 1364 memset(p, 0, sizeof(*p));
1da177e4
LT		 1365 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1366 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1367 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1368 p->priority = xp->priority;
1369 p->index = xp->index;
1370 p->sel.family = xp->family;
1371 p->dir = dir;
1372 p->action = xp->action;
1373 p->flags = xp->flags;
1374 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1375}
1376
fc34acd3 1377static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1378{
fc34acd3 1379 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1380 int err;
1381
1382 if (!xp) {
1383 *errp = -ENOMEM;
1384 return NULL;
1385 }
1386
1387 copy_from_user_policy(xp, p);
df71837d 1388
35a7aa08 1389 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1390 if (err)
1391 goto error;
1392
35a7aa08
TG		 1393 if (!(err = copy_from_user_tmpl(xp, attrs)))
1394 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1395 if (err)
1396 goto error;
1da177e4 1397
295fae56
JHS		 1398 xfrm_mark_get(attrs, &xp->mark);
1399
1da177e4 1400 return xp;
f7b6983f
MN		 1401 error:
1402 *errp = err;
12a169e7 1403 xp->walk.dead = 1;
64c31b3f 1404 xfrm_policy_destroy(xp);
f7b6983f 1405 return NULL;
1da177e4
LT		 1406}
1407
22e70050 1408static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1409 struct nlattr **attrs)
1da177e4 1410{
fc34acd3 1411 struct net *net = sock_net(skb->sk);
7b67c857 1412 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1413 struct xfrm_policy *xp;
26b15dad 1414 struct km_event c;
1da177e4
LT		 1415 int err;
1416 int excl;
e1760bd5 1417 kuid_t loginuid = audit_get_loginuid(current);
4440e854 1418 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed 1419 u32 sid;
1da177e4
LT		 1420
1421 err = verify_newpolicy_info(p);
df71837d
TJ		 1422 if (err)
1423 return err;
35a7aa08 1424 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1425 if (err)
1426 return err;
1427
fc34acd3 1428 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1429 if (!xp)
1430 return err;
1431
25985edc 1432 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1433 * Aha! this is anti-netlink really i.e more pfkey derived
1434 * in netlink excl is a flag and you wouldnt need
1435 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1436 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1437 err = xfrm_policy_insert(p->dir, xp, excl);
c53fa1ed 1438 security_task_getsecid(current, &sid);
2532386f 1439 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 1440
1da177e4 1441 if (err) {
03e1ad7b 1442 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1443 kfree(xp);
1444 return err;
1445 }
1446
f60f6b8f 1447 c.event = nlh->nlmsg_type;
26b15dad 1448 c.seq = nlh->nlmsg_seq;
15e47304 1449 c.portid = nlh->nlmsg_pid;
26b15dad
JHS		 1450 km_policy_notify(xp, p->dir, &c);
1451
1da177e4
LT		 1452 xfrm_pol_put(xp);
1453
1454 return 0;
1455}
1456
1457static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1458{
1459 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1460 int i;
1461
1462 if (xp->xfrm_nr == 0)
1463 return 0;
1464
1465 for (i = 0; i < xp->xfrm_nr; i++) {
1466 struct xfrm_user_tmpl *up = &vec[i];
1467 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1468
1f86840f 1469 memset(up, 0, sizeof(*up));
1da177e4 1470 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1471 up->family = kp->encap_family;
1da177e4
LT		 1472 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1473 up->reqid = kp->reqid;
1474 up->mode = kp->mode;
1475 up->share = kp->share;
1476 up->optional = kp->optional;
1477 up->aalgos = kp->aalgos;
1478 up->ealgos = kp->ealgos;
1479 up->calgos = kp->calgos;
1480 }
df71837d 1481
c0144bea
TG		 1482 return nla_put(skb, XFRMA_TMPL,
1483 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1484}
1485
1486static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1487{
1488 if (x->security) {
1489 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1490 }
1491 return 0;
0d681623 1492}
df71837d 1493
0d681623
SH		 1494static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1495{
1d1e34dd 1496 if (xp->security)
0d681623 1497 return copy_sec_ctx(xp->security, skb);
0d681623 1498 return 0;
df71837d 1499}
cfbfd45a
TG		 1500static inline size_t userpolicy_type_attrsize(void)
1501{
1502#ifdef CONFIG_XFRM_SUB_POLICY
1503 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1504#else
1505 return 0;
1506#endif
1507}
df71837d 1508
f7b6983f 1509#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1510static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1511{
c0144bea
TG		 1512 struct xfrm_userpolicy_type upt = {
1513 .type = type,
1514 };
f7b6983f 1515
c0144bea 1516 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1517}
1518
1519#else
b798a9ed 1520static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1521{
1522 return 0;
1523}
1524#endif
1525
1da177e4
LT		 1526static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1527{
1528 struct xfrm_dump_info *sp = ptr;
1529 struct xfrm_userpolicy_info *p;
1530 struct sk_buff *in_skb = sp->in_skb;
1531 struct sk_buff *skb = sp->out_skb;
1532 struct nlmsghdr *nlh;
1d1e34dd 1533 int err;
1da177e4 1534
15e47304 1535 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
79b8b7f4
TG		 1536 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1537 if (nlh == NULL)
1538 return -EMSGSIZE;
1da177e4 1539
7b67c857 1540 p = nlmsg_data(nlh);
1da177e4 1541 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1542 err = copy_to_user_tmpl(xp, skb);
1543 if (!err)
1544 err = copy_to_user_sec_ctx(xp, skb);
1545 if (!err)
1546 err = copy_to_user_policy_type(xp->type, skb);
1547 if (!err)
1548 err = xfrm_mark_put(skb, &xp->mark);
1549 if (err) {
1550 nlmsg_cancel(skb, nlh);
1551 return err;
1552 }
9825069d 1553 nlmsg_end(skb, nlh);
1da177e4 1554 return 0;
1da177e4
LT		 1555}
1556
4c563f76
TT		 1557static int xfrm_dump_policy_done(struct netlink_callback *cb)
1558{
1559 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
283bc9f3 1560 struct net *net = sock_net(cb->skb->sk);
4c563f76 1561
283bc9f3 1562 xfrm_policy_walk_done(walk, net);
4c563f76
TT		 1563 return 0;
1564}
1565
1da177e4
LT		 1566static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1567{
fc34acd3 1568 struct net *net = sock_net(skb->sk);
4c563f76 1569 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1570 struct xfrm_dump_info info;
1571
4c563f76
TT		 1572 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1573 sizeof(cb->args) - sizeof(cb->args[0]));
1574
1da177e4
LT		 1575 info.in_skb = cb->skb;
1576 info.out_skb = skb;
1577 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1578 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1579
1580 if (!cb->args[0]) {
1581 cb->args[0] = 1;
1582 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1583 }
1584
fc34acd3 1585 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1586
1587 return skb->len;
1588}
1589
1590static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1591 struct xfrm_policy *xp,
1592 int dir, u32 seq)
1593{
1594 struct xfrm_dump_info info;
1595 struct sk_buff *skb;
c2546372 1596 int err;
1da177e4 1597
7deb2264 1598 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1599 if (!skb)
1600 return ERR_PTR(-ENOMEM);
1601
1da177e4
LT		 1602 info.in_skb = in_skb;
1603 info.out_skb = skb;
1604 info.nlmsg_seq = seq;
1605 info.nlmsg_flags = 0;
1da177e4 1606
c2546372
MK		 1607 err = dump_one_policy(xp, dir, 0, &info);
1608 if (err) {
1da177e4 1609 kfree_skb(skb);
c2546372 1610 return ERR_PTR(err);
1da177e4
LT		 1611 }
1612
1613 return skb;
1614}
1615
22e70050 1616static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1617 struct nlattr **attrs)
1da177e4 1618{
fc34acd3 1619 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1620 struct xfrm_policy *xp;
1621 struct xfrm_userpolicy_id *p;
b798a9ed 1622 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1623 int err;
26b15dad 1624 struct km_event c;
1da177e4 1625 int delete;
295fae56
JHS		 1626 struct xfrm_mark m;
1627 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1628
7b67c857 1629 p = nlmsg_data(nlh);
1da177e4
LT		 1630 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1631
35a7aa08 1632 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1633 if (err)
1634 return err;
1635
1da177e4
LT		 1636 err = verify_policy_dir(p->dir);
1637 if (err)
1638 return err;
1639
1640 if (p->index)
295fae56 1641 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1642 else {
5424f32e 1643 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1644 struct xfrm_sec_ctx *ctx;
df71837d 1645
35a7aa08 1646 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1647 if (err)
1648 return err;
1649
2c8dd116 1650 ctx = NULL;
df71837d 1651 if (rt) {
5424f32e 1652 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1653
52a4c640 1654 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 1655 if (err)
df71837d 1656 return err;
2c8dd116 1657 }
295fae56 1658 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1659 ctx, delete, &err);
03e1ad7b 1660 security_xfrm_policy_free(ctx);
df71837d 1661 }
1da177e4
LT		 1662 if (xp == NULL)
1663 return -ENOENT;
1664
1665 if (!delete) {
1666 struct sk_buff *resp_skb;
1667
1668 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1669 if (IS_ERR(resp_skb)) {
1670 err = PTR_ERR(resp_skb);
1671 } else {
a6483b79 1672 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
15e47304 1673 NETLINK_CB(skb).portid);
1da177e4 1674 }
26b15dad 1675 } else {
e1760bd5 1676 kuid_t loginuid = audit_get_loginuid(current);
4440e854 1677 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed 1678 u32 sid;
2532386f 1679
c53fa1ed 1680 security_task_getsecid(current, &sid);
2532386f
EP		 1681 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1682 sid);
13fcfbb0
DM		 1683
1684 if (err != 0)
c8c05a8e 1685 goto out;
13fcfbb0 1686
e7443892 1687 c.data.byid = p->index;
f60f6b8f 1688 c.event = nlh->nlmsg_type;
26b15dad 1689 c.seq = nlh->nlmsg_seq;
15e47304 1690 c.portid = nlh->nlmsg_pid;
26b15dad 1691 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1692 }
1693
c8c05a8e 1694out:
ef41aaa0 1695 xfrm_pol_put(xp);
e4c17216
PM		 1696 if (delete && err == 0)
1697 xfrm_garbage_collect(net);
1da177e4
LT		 1698 return err;
1699}
1700
22e70050 1701static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1702 struct nlattr **attrs)
1da177e4 1703{
fc34acd3 1704 struct net *net = sock_net(skb->sk);
26b15dad 1705 struct km_event c;
7b67c857 1706 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
161a09e7 1707 struct xfrm_audit audit_info;
4aa2e62c 1708 int err;
1da177e4 1709
c53fa1ed
PM		 1710 audit_info.loginuid = audit_get_loginuid(current);
1711 audit_info.sessionid = audit_get_sessionid(current);
1712 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1713 err = xfrm_state_flush(net, p->proto, &audit_info);
9e64cc95
JHS		 1714 if (err) {
1715 if (err == -ESRCH) /* empty table */
1716 return 0;
069c474e 1717 return err;
9e64cc95 1718 }
bf08867f 1719 c.data.proto = p->proto;
f60f6b8f 1720 c.event = nlh->nlmsg_type;
26b15dad 1721 c.seq = nlh->nlmsg_seq;
15e47304 1722 c.portid = nlh->nlmsg_pid;
7067802e 1723 c.net = net;
26b15dad
JHS		 1724 km_state_notify(NULL, &c);
1725
1da177e4
LT		 1726 return 0;
1727}
1728
d8647b79 1729static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1730{
d8647b79
SK		 1731 size_t replay_size = x->replay_esn ?
1732 xfrm_replay_state_esn_len(x->replay_esn) :
1733 sizeof(struct xfrm_replay_state);
1734
7deb2264 1735 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1736 + nla_total_size(replay_size)
7deb2264 1737 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1738 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1739 + nla_total_size(4) /* XFRM_AE_RTHR */
1740 + nla_total_size(4); /* XFRM_AE_ETHR */
1741}
d51d081d 1742
214e005b 1743static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1744{
1745 struct xfrm_aevent_id *id;
1746 struct nlmsghdr *nlh;
1d1e34dd 1747 int err;
d51d081d 1748
15e47304 1749 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
79b8b7f4
TG		 1750 if (nlh == NULL)
1751 return -EMSGSIZE;
d51d081d 1752
7b67c857 1753 id = nlmsg_data(nlh);
9b7a787d 1754 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
d51d081d
JHS		 1755 id->sa_id.spi = x->id.spi;
1756 id->sa_id.family = x->props.family;
1757 id->sa_id.proto = x->id.proto;
9b7a787d 1758 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2b5f6dcc 1759 id->reqid = x->props.reqid;
d51d081d
JHS		 1760 id->flags = c->data.aevent;
1761
d0fde795 1762 if (x->replay_esn) {
1d1e34dd
DM		 1763 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1764 xfrm_replay_state_esn_len(x->replay_esn),
1765 x->replay_esn);
d0fde795 1766 } else {
1d1e34dd
DM		 1767 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1768 &x->replay);
d0fde795 1769 }
1d1e34dd
DM		 1770 if (err)
1771 goto out_cancel;
1772 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1773 if (err)
1774 goto out_cancel;
d51d081d 1775
1d1e34dd
DM		 1776 if (id->flags & XFRM_AE_RTHR) {
1777 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1778 if (err)
1779 goto out_cancel;
1780 }
1781 if (id->flags & XFRM_AE_ETHR) {
1782 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1783 x->replay_maxage * 10 / HZ);
1784 if (err)
1785 goto out_cancel;
1786 }
1787 err = xfrm_mark_put(skb, &x->mark);
1788 if (err)
1789 goto out_cancel;
6f26b61e 1790
9825069d 1791 return nlmsg_end(skb, nlh);
d51d081d 1792
1d1e34dd 1793out_cancel:
9825069d 1794 nlmsg_cancel(skb, nlh);
1d1e34dd 1795 return err;
d51d081d
JHS		 1796}
1797
22e70050 1798static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1799 struct nlattr **attrs)
d51d081d 1800{
fc34acd3 1801 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1802 struct xfrm_state *x;
1803 struct sk_buff *r_skb;
1804 int err;
1805 struct km_event c;
6f26b61e
JHS		 1806 u32 mark;
1807 struct xfrm_mark m;
7b67c857 1808 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1809 struct xfrm_usersa_id *id = &p->sa_id;
1810
6f26b61e
JHS		 1811 mark = xfrm_mark_get(attrs, &m);
1812
1813 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1814 if (x == NULL)
d51d081d 1815 return -ESRCH;
d8647b79
SK		 1816
1817 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1818 if (r_skb == NULL) {
1819 xfrm_state_put(x);
1820 return -ENOMEM;
d51d081d
JHS		 1821 }
1822
1823 /*
1824 * XXX: is this lock really needed - none of the other
1825 * gets lock (the concern is things getting updated
1826 * while we are still reading) - jhs
1827 */
1828 spin_lock_bh(&x->lock);
1829 c.data.aevent = p->flags;
1830 c.seq = nlh->nlmsg_seq;
15e47304 1831 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1832
1833 if (build_aevent(r_skb, x, &c) < 0)
1834 BUG();
15e47304 1835 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
d51d081d
JHS		 1836 spin_unlock_bh(&x->lock);
1837 xfrm_state_put(x);
1838 return err;
1839}
1840
22e70050 1841static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1842 struct nlattr **attrs)
d51d081d 1843{
fc34acd3 1844 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1845 struct xfrm_state *x;
1846 struct km_event c;
02d0892f 1847 int err = -EINVAL;
6f26b61e
JHS		 1848 u32 mark = 0;
1849 struct xfrm_mark m;
7b67c857 1850 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1851 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1852 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1853 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1854
d8647b79 1855 if (!lt && !rp && !re)
d51d081d
JHS		 1856 return err;
1857
1858 /* pedantic mode - thou shalt sayeth replaceth */
1859 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1860 return err;
1861
6f26b61e
JHS		 1862 mark = xfrm_mark_get(attrs, &m);
1863
1864 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1865 if (x == NULL)
1866 return -ESRCH;
1867
1868 if (x->km.state != XFRM_STATE_VALID)
1869 goto out;
1870
4479ff76 1871 err = xfrm_replay_verify_len(x->replay_esn, re);
e2b19125
SK		 1872 if (err)
1873 goto out;
1874
d51d081d 1875 spin_lock_bh(&x->lock);
e3ac104d 1876 xfrm_update_ae_params(x, attrs, 1);
d51d081d 1877 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1878
1879 c.event = nlh->nlmsg_type;
1880 c.seq = nlh->nlmsg_seq;
15e47304 1881 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1882 c.data.aevent = XFRM_AE_CU;
1883 km_state_notify(x, &c);
1884 err = 0;
1885out:
1886 xfrm_state_put(x);
1887 return err;
1888}
1889
22e70050 1890static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1891 struct nlattr **attrs)
1da177e4 1892{
fc34acd3 1893 struct net *net = sock_net(skb->sk);
f7b6983f 1894 struct km_event c;
b798a9ed 1895 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1896 int err;
161a09e7 1897 struct xfrm_audit audit_info;
f7b6983f 1898
35a7aa08 1899 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1900 if (err)
1901 return err;
26b15dad 1902
c53fa1ed
PM		 1903 audit_info.loginuid = audit_get_loginuid(current);
1904 audit_info.sessionid = audit_get_sessionid(current);
1905 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1906 err = xfrm_policy_flush(net, type, &audit_info);
2f1eb65f
JHS		 1907 if (err) {
1908 if (err == -ESRCH) /* empty table */
1909 return 0;
069c474e 1910 return err;
2f1eb65f
JHS		 1911 }
1912
f7b6983f 1913 c.data.type = type;
f60f6b8f 1914 c.event = nlh->nlmsg_type;
26b15dad 1915 c.seq = nlh->nlmsg_seq;
15e47304 1916 c.portid = nlh->nlmsg_pid;
7067802e 1917 c.net = net;
26b15dad 1918 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1919 return 0;
1920}
1921
22e70050 1922static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1923 struct nlattr **attrs)
6c5c8ca7 1924{
fc34acd3 1925 struct net *net = sock_net(skb->sk);
6c5c8ca7 1926 struct xfrm_policy *xp;
7b67c857 1927 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1928 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1929 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1930 int err = -ENOENT;
295fae56
JHS		 1931 struct xfrm_mark m;
1932 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1933
35a7aa08 1934 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1935 if (err)
1936 return err;
1937
c8bf4d04
TT		 1938 err = verify_policy_dir(p->dir);
1939 if (err)
1940 return err;
1941
6c5c8ca7 1942 if (p->index)
295fae56 1943 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1944 else {
5424f32e 1945 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1946 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1947
35a7aa08 1948 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1949 if (err)
1950 return err;
1951
2c8dd116 1952 ctx = NULL;
6c5c8ca7 1953 if (rt) {
5424f32e 1954 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1955
52a4c640 1956 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 1957 if (err)
6c5c8ca7 1958 return err;
2c8dd116 1959 }
295fae56 1960 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 1961 &p->sel, ctx, 0, &err);
03e1ad7b 1962 security_xfrm_policy_free(ctx);
6c5c8ca7 1963 }
6c5c8ca7 1964 if (xp == NULL)
ef41aaa0 1965 return -ENOENT;
03e1ad7b 1966
ea2dea9d 1967 if (unlikely(xp->walk.dead))
6c5c8ca7 1968 goto out;
6c5c8ca7 1969
6c5c8ca7
JHS		 1970 err = 0;
1971 if (up->hard) {
e1760bd5 1972 kuid_t loginuid = audit_get_loginuid(current);
4440e854 1973 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed
PM		 1974 u32 sid;
1975
1976 security_task_getsecid(current, &sid);
6c5c8ca7 1977 xfrm_policy_delete(xp, p->dir);
2532386f 1978 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
161a09e7 1979
6c5c8ca7
JHS		 1980 } else {
1981 // reset the timers here?
62db5cfd 1982 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7 1983 }
c6bb8136 1984 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
6c5c8ca7
JHS		 1985
1986out:
1987 xfrm_pol_put(xp);
1988 return err;
1989}
1990
22e70050 1991static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1992 struct nlattr **attrs)
53bc6b4d 1993{
fc34acd3 1994 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 1995 struct xfrm_state *x;
1996 int err;
7b67c857 1997 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 1998 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 1999 struct xfrm_mark m;
928497f0 2000 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 2001
6f26b61e 2002 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 2003
3a765aa5 2004 err = -ENOENT;
53bc6b4d
JHS		 2005 if (x == NULL)
2006 return err;
2007
53bc6b4d 2008 spin_lock_bh(&x->lock);
3a765aa5 2009 err = -EINVAL;
53bc6b4d
JHS		 2010 if (x->km.state != XFRM_STATE_VALID)
2011 goto out;
c6bb8136 2012 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
53bc6b4d 2013
161a09e7 2014 if (ue->hard) {
e1760bd5 2015 kuid_t loginuid = audit_get_loginuid(current);
4440e854 2016 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed
PM		 2017 u32 sid;
2018
2019 security_task_getsecid(current, &sid);
53bc6b4d 2020 __xfrm_state_delete(x);
2532386f 2021 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
161a09e7 2022 }
3a765aa5 2023 err = 0;
53bc6b4d
JHS		 2024out:
2025 spin_unlock_bh(&x->lock);
2026 xfrm_state_put(x);
2027 return err;
2028}
2029
22e70050 2030static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2031 struct nlattr **attrs)
980ebd25 2032{
fc34acd3 2033 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 2034 struct xfrm_policy *xp;
2035 struct xfrm_user_tmpl *ut;
2036 int i;
5424f32e 2037 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 2038 struct xfrm_mark mark;
980ebd25 2039
7b67c857 2040 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 2041 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 2042 int err = -ENOMEM;
2043
2044 if (!x)
d8eb9307 2045 goto nomem;
980ebd25 2046
6f26b61e
JHS		 2047 xfrm_mark_get(attrs, &mark);
2048
980ebd25 2049 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 2050 if (err)
2051 goto bad_policy;
980ebd25
JHS		 2052
2053 /* build an XP */
fc34acd3 2054 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2055 if (!xp)
2056 goto free_state;
980ebd25
JHS		 2057
2058 memcpy(&x->id, &ua->id, sizeof(ua->id));
2059 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2060 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2061 xp->mark.m = x->mark.m = mark.m;
2062 xp->mark.v = x->mark.v = mark.v;
5424f32e 2063 ut = nla_data(rt);
980ebd25
JHS		 2064 /* extract the templates and for each call km_key */
2065 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2066 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2067 memcpy(&x->id, &t->id, sizeof(x->id));
2068 x->props.mode = t->mode;
2069 x->props.reqid = t->reqid;
2070 x->props.family = ut->family;
2071 t->aalgos = ua->aalgos;
2072 t->ealgos = ua->ealgos;
2073 t->calgos = ua->calgos;
2074 err = km_query(x, t, xp);
2075
2076 }
2077
2078 kfree(x);
2079 kfree(xp);
2080
2081 return 0;
d8eb9307
IJ		 2082
2083bad_policy:
62db5cfd 2084 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2085free_state:
2086 kfree(x);
2087nomem:
2088 return err;
980ebd25
JHS		 2089}
2090
5c79de6e 2091#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2092static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2093 struct xfrm_kmaddress *k,
5424f32e 2094 struct nlattr **attrs, int *num)
5c79de6e 2095{
5424f32e 2096 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2097 struct xfrm_user_migrate *um;
2098 int i, num_migrate;
2099
13c1d189
AE		 2100 if (k != NULL) {
2101 struct xfrm_user_kmaddress *uk;
2102
2103 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2104 memcpy(&k->local, &uk->local, sizeof(k->local));
2105 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2106 k->family = uk->family;
2107 k->reserved = uk->reserved;
2108 }
2109
5424f32e
TG		 2110 um = nla_data(rt);
2111 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2112
2113 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2114 return -EINVAL;
2115
2116 for (i = 0; i < num_migrate; i++, um++, ma++) {
2117 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2118 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2119 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2120 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2121
2122 ma->proto = um->proto;
2123 ma->mode = um->mode;
2124 ma->reqid = um->reqid;
2125
2126 ma->old_family = um->old_family;
2127 ma->new_family = um->new_family;
2128 }
2129
2130 *num = i;
2131 return 0;
2132}
2133
2134static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2135 struct nlattr **attrs)
5c79de6e 2136{
7b67c857 2137 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2138 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2139 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2140 u8 type;
2141 int err;
2142 int n = 0;
8d549c4f 2143 struct net *net = sock_net(skb->sk);
5c79de6e 2144
35a7aa08 2145 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2146 return -EINVAL;
5c79de6e 2147
13c1d189
AE		 2148 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2149
5424f32e 2150 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2151 if (err)
2152 return err;
2153
13c1d189 2154 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2155 if (err)
2156 return err;
2157
2158 if (!n)
2159 return 0;
2160
8d549c4f 2161 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
5c79de6e
SS		 2162
2163 return 0;
2164}
2165#else
2166static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2167 struct nlattr **attrs)
5c79de6e
SS		 2168{
2169 return -ENOPROTOOPT;
2170}
2171#endif
2172
2173#ifdef CONFIG_XFRM_MIGRATE
183cad12 2174static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2175{
2176 struct xfrm_user_migrate um;
2177
2178 memset(&um, 0, sizeof(um));
2179 um.proto = m->proto;
2180 um.mode = m->mode;
2181 um.reqid = m->reqid;
2182 um.old_family = m->old_family;
2183 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2184 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2185 um.new_family = m->new_family;
2186 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2187 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2188
c0144bea 2189 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2190}
2191
183cad12 2192static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2193{
2194 struct xfrm_user_kmaddress uk;
2195
2196 memset(&uk, 0, sizeof(uk));
2197 uk.family = k->family;
2198 uk.reserved = k->reserved;
2199 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2200 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2201
2202 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2203}
2204
2205static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2206{
2207 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2208 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2209 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2210 + userpolicy_type_attrsize();
7deb2264
TG		 2211}
2212
183cad12
DM		 2213static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2214 int num_migrate, const struct xfrm_kmaddress *k,
2215 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2216{
183cad12 2217 const struct xfrm_migrate *mp;
5c79de6e
SS		 2218 struct xfrm_userpolicy_id *pol_id;
2219 struct nlmsghdr *nlh;
1d1e34dd 2220 int i, err;
5c79de6e 2221
79b8b7f4
TG		 2222 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2223 if (nlh == NULL)
2224 return -EMSGSIZE;
5c79de6e 2225
7b67c857 2226 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2227 /* copy data from selector, dir, and type to the pol_id */
2228 memset(pol_id, 0, sizeof(*pol_id));
2229 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2230 pol_id->dir = dir;
2231
1d1e34dd
DM		 2232 if (k != NULL) {
2233 err = copy_to_user_kmaddress(k, skb);
2234 if (err)
2235 goto out_cancel;
2236 }
2237 err = copy_to_user_policy_type(type, skb);
2238 if (err)
2239 goto out_cancel;
5c79de6e 2240 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2241 err = copy_to_user_migrate(mp, skb);
2242 if (err)
2243 goto out_cancel;
5c79de6e
SS		 2244 }
2245
9825069d 2246 return nlmsg_end(skb, nlh);
1d1e34dd
DM		 2247
2248out_cancel:
9825069d 2249 nlmsg_cancel(skb, nlh);
1d1e34dd 2250 return err;
5c79de6e
SS		 2251}
2252
183cad12
DM		 2253static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2254 const struct xfrm_migrate *m, int num_migrate,
2255 const struct xfrm_kmaddress *k)
5c79de6e 2256{
a6483b79 2257 struct net *net = &init_net;
5c79de6e 2258 struct sk_buff *skb;
5c79de6e 2259
13c1d189 2260 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2261 if (skb == NULL)
2262 return -ENOMEM;
2263
2264 /* build migrate */
13c1d189 2265 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2266 BUG();
2267
a6483b79 2268 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
5c79de6e
SS		 2269}
2270#else
183cad12
DM		 2271static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2272 const struct xfrm_migrate *m, int num_migrate,
2273 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2274{
2275 return -ENOPROTOOPT;
2276}
2277#endif
d51d081d 2278
a7bd9a45 2279#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2280
2281static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2282 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2283 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2284 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2285 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2286 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2287 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2288 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2289 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2290 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2291 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2292 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2293 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2294 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2295 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2296 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2297 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2298 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2299 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 2300 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2301 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2302};
2303
492b558b
TG		 2304#undef XMSGSIZE
2305
cf5cb79f 2306static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2307 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2308 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2309 [XFRMA_LASTUSED] = { .type = NLA_U64},
2310 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2311 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2312 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2313 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2314 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2315 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2316 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2317 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2318 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2319 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2320 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2321 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2322 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2323 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2324 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2325 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2326 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2327 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2328 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2329 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
a947b0a9 2330 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
d3623099 2331 [XFRMA_PROTO] = { .type = NLA_U8 },
870a2df4 2332 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
cf5cb79f
TG		 2333};
2334
05600a79 2335static const struct xfrm_link {
5424f32e 2336 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2337 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2338 int (*done)(struct netlink_callback *);
492b558b
TG		 2339} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2340 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2341 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2342 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2343 .dump = xfrm_dump_sa,
2344 .done = xfrm_dump_sa_done },
492b558b
TG		 2345 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2346 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2347 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2348 .dump = xfrm_dump_policy,
2349 .done = xfrm_dump_policy_done },
492b558b 2350 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2351 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2352 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2353 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2354 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2355 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2356 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2357 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2358 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2359 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2360 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2361 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 2362 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2363};
2364
1d00a4eb 2365static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2366{
a6483b79 2367 struct net *net = sock_net(skb->sk);
35a7aa08 2368 struct nlattr *attrs[XFRMA_MAX+1];
05600a79 2369 const struct xfrm_link *link;
a7bd9a45 2370 int type, err;
1da177e4 2371
1da177e4 2372 type = nlh->nlmsg_type;
1da177e4 2373 if (type > XFRM_MSG_MAX)
1d00a4eb 2374 return -EINVAL;
1da177e4
LT		 2375
2376 type -= XFRM_MSG_BASE;
2377 link = &xfrm_dispatch[type];
2378
2379 /* All operations require privileges, even GET */
df008c91 2380 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1d00a4eb 2381 return -EPERM;
1da177e4 2382
492b558b
TG		 2383 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2384 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2385 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2386 if (link->dump == NULL)
1d00a4eb 2387 return -EINVAL;
88fc2c84 2388
80d326fa
PNA		 2389 {
2390 struct netlink_dump_control c = {
2391 .dump = link->dump,
2392 .done = link->done,
2393 };
2394 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2395 }
1da177e4
LT		 2396 }
2397
35a7aa08 2398 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 2399 xfrma_policy);
a7bd9a45
TG		 2400 if (err < 0)
2401 return err;
1da177e4
LT		 2402
2403 if (link->doit == NULL)
1d00a4eb 2404 return -EINVAL;
1da177e4 2405
5424f32e 2406 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2407}
2408
cd40b7d3 2409static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2410{
283bc9f3
FD		 2411 struct net *net = sock_net(skb->sk);
2412
2413 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
cd40b7d3 2414 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
283bc9f3 2415 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
1da177e4
LT		 2416}
2417
7deb2264
TG		 2418static inline size_t xfrm_expire_msgsize(void)
2419{
6f26b61e
JHS		 2420 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2421 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2422}
2423
214e005b 2424static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2425{
2426 struct xfrm_user_expire *ue;
2427 struct nlmsghdr *nlh;
1d1e34dd 2428 int err;
1da177e4 2429
15e47304 2430 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
79b8b7f4
TG		 2431 if (nlh == NULL)
2432 return -EMSGSIZE;
1da177e4 2433
7b67c857 2434 ue = nlmsg_data(nlh);
1da177e4 2435 copy_to_user_state(x, &ue->state);
d51d081d 2436 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2437
1d1e34dd
DM		 2438 err = xfrm_mark_put(skb, &x->mark);
2439 if (err)
2440 return err;
6f26b61e 2441
9825069d 2442 return nlmsg_end(skb, nlh);
1da177e4
LT		 2443}
2444
214e005b 2445static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2446{
fc34acd3 2447 struct net *net = xs_net(x);
1da177e4
LT		 2448 struct sk_buff *skb;
2449
7deb2264 2450 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2451 if (skb == NULL)
2452 return -ENOMEM;
2453
6f26b61e
JHS		 2454 if (build_expire(skb, x, c) < 0) {
2455 kfree_skb(skb);
2456 return -EMSGSIZE;
2457 }
1da177e4 2458
a6483b79 2459 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2460}
2461
214e005b 2462static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2463{
fc34acd3 2464 struct net *net = xs_net(x);
d51d081d 2465 struct sk_buff *skb;
d51d081d 2466
d8647b79 2467 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2468 if (skb == NULL)
2469 return -ENOMEM;
2470
2471 if (build_aevent(skb, x, c) < 0)
2472 BUG();
2473
a6483b79 2474 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
d51d081d
JHS		 2475}
2476
214e005b 2477static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2478{
7067802e 2479 struct net *net = c->net;
26b15dad
JHS		 2480 struct xfrm_usersa_flush *p;
2481 struct nlmsghdr *nlh;
2482 struct sk_buff *skb;
7deb2264 2483 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2484
7deb2264 2485 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2486 if (skb == NULL)
2487 return -ENOMEM;
26b15dad 2488
15e47304 2489 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
79b8b7f4
TG		 2490 if (nlh == NULL) {
2491 kfree_skb(skb);
2492 return -EMSGSIZE;
2493 }
26b15dad 2494
7b67c857 2495 p = nlmsg_data(nlh);
bf08867f 2496 p->proto = c->data.proto;
26b15dad 2497
9825069d 2498 nlmsg_end(skb, nlh);
26b15dad 2499
a6483b79 2500 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2501}
2502
7deb2264 2503static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2504{
7deb2264 2505 size_t l = 0;
1a6509d9
HX		 2506 if (x->aead)
2507 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2508 if (x->aalg) {
2509 l += nla_total_size(sizeof(struct xfrm_algo) +
2510 (x->aalg->alg_key_len + 7) / 8);
2511 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2512 }
26b15dad 2513 if (x->ealg)
0f99be0d 2514 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2515 if (x->calg)
7deb2264 2516 l += nla_total_size(sizeof(*x->calg));
26b15dad 2517 if (x->encap)
7deb2264 2518 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2519 if (x->tfcpad)
2520 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2521 if (x->replay_esn)
2522 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
68325d3b
HX		 2523 if (x->security)
2524 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2525 x->security->ctx_len);
2526 if (x->coaddr)
2527 l += nla_total_size(sizeof(*x->coaddr));
a947b0a9
ND		 2528 if (x->props.extra_flags)
2529 l += nla_total_size(sizeof(x->props.extra_flags));
68325d3b 2530
d26f3984
HX		 2531 /* Must count x->lastused as it may become non-zero behind our back. */
2532 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2533
2534 return l;
2535}
2536
214e005b 2537static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2538{
fc34acd3 2539 struct net *net = xs_net(x);
26b15dad 2540 struct xfrm_usersa_info *p;
0603eac0 2541 struct xfrm_usersa_id *id;
26b15dad
JHS		 2542 struct nlmsghdr *nlh;
2543 struct sk_buff *skb;
26b15dad 2544 int len = xfrm_sa_len(x);
1d1e34dd 2545 int headlen, err;
0603eac0
HX		 2546
2547 headlen = sizeof(*p);
2548 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2549 len += nla_total_size(headlen);
0603eac0 2550 headlen = sizeof(*id);
6f26b61e 2551 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2552 }
7deb2264 2553 len += NLMSG_ALIGN(headlen);
26b15dad 2554
7deb2264 2555 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2556 if (skb == NULL)
2557 return -ENOMEM;
26b15dad 2558
15e47304 2559 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2560 err = -EMSGSIZE;
79b8b7f4 2561 if (nlh == NULL)
1d1e34dd 2562 goto out_free_skb;
26b15dad 2563
7b67c857 2564 p = nlmsg_data(nlh);
0603eac0 2565 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2566 struct nlattr *attr;
2567
7b67c857 2568 id = nlmsg_data(nlh);
0603eac0
HX		 2569 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2570 id->spi = x->id.spi;
2571 id->family = x->props.family;
2572 id->proto = x->id.proto;
2573
c0144bea 2574 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2575 err = -EMSGSIZE;
c0144bea 2576 if (attr == NULL)
1d1e34dd 2577 goto out_free_skb;
c0144bea
TG		 2578
2579 p = nla_data(attr);
0603eac0 2580 }
1d1e34dd
DM		 2581 err = copy_to_user_state_extra(x, p, skb);
2582 if (err)
2583 goto out_free_skb;
26b15dad 2584
9825069d 2585 nlmsg_end(skb, nlh);
26b15dad 2586
a6483b79 2587 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad 2588
1d1e34dd 2589out_free_skb:
26b15dad 2590 kfree_skb(skb);
1d1e34dd 2591 return err;
26b15dad
JHS		 2592}
2593
214e005b 2594static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2595{
2596
2597 switch (c->event) {
f60f6b8f 2598 case XFRM_MSG_EXPIRE:
26b15dad 2599 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2600 case XFRM_MSG_NEWAE:
2601 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2602 case XFRM_MSG_DELSA:
2603 case XFRM_MSG_UPDSA:
2604 case XFRM_MSG_NEWSA:
26b15dad 2605 return xfrm_notify_sa(x, c);
f60f6b8f 2606 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2607 return xfrm_notify_sa_flush(c);
2608 default:
62db5cfd 2609 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2610 c->event);
2611 break;
26b15dad
JHS		 2612 }
2613
2614 return 0;
2615
2616}
2617
7deb2264
TG		 2618static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2619 struct xfrm_policy *xp)
2620{
2621 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2622 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2623 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2624 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2625 + userpolicy_type_attrsize();
2626}
2627
1da177e4 2628static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
65e0736b 2629 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
1da177e4 2630{
1d1e34dd 2631 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2632 struct xfrm_user_acquire *ua;
2633 struct nlmsghdr *nlh;
1d1e34dd 2634 int err;
1da177e4 2635
79b8b7f4
TG		 2636 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2637 if (nlh == NULL)
2638 return -EMSGSIZE;
1da177e4 2639
7b67c857 2640 ua = nlmsg_data(nlh);
1da177e4
LT		 2641 memcpy(&ua->id, &x->id, sizeof(ua->id));
2642 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2643 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
65e0736b 2644 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
1da177e4
LT		 2645 ua->aalgos = xt->aalgos;
2646 ua->ealgos = xt->ealgos;
2647 ua->calgos = xt->calgos;
2648 ua->seq = x->km.seq = seq;
2649
1d1e34dd
DM		 2650 err = copy_to_user_tmpl(xp, skb);
2651 if (!err)
2652 err = copy_to_user_state_sec_ctx(x, skb);
2653 if (!err)
2654 err = copy_to_user_policy_type(xp->type, skb);
2655 if (!err)
2656 err = xfrm_mark_put(skb, &xp->mark);
2657 if (err) {
2658 nlmsg_cancel(skb, nlh);
2659 return err;
2660 }
1da177e4 2661
9825069d 2662 return nlmsg_end(skb, nlh);
1da177e4
LT		 2663}
2664
2665static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
65e0736b 2666 struct xfrm_policy *xp)
1da177e4 2667{
a6483b79 2668 struct net *net = xs_net(x);
1da177e4 2669 struct sk_buff *skb;
1da177e4 2670
7deb2264 2671 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2672 if (skb == NULL)
2673 return -ENOMEM;
2674
65e0736b 2675 if (build_acquire(skb, x, xt, xp) < 0)
1da177e4
LT		 2676 BUG();
2677
a6483b79 2678 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2679}
2680
2681/* User gives us xfrm_user_policy_info followed by an array of 0
2682 * or more templates.
2683 */
cb969f07 2684static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2685 u8 *data, int len, int *dir)
2686{
fc34acd3 2687 struct net *net = sock_net(sk);
1da177e4
LT		 2688 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2689 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2690 struct xfrm_policy *xp;
2691 int nr;
2692
cb969f07 2693 switch (sk->sk_family) {
1da177e4
LT		 2694 case AF_INET:
2695 if (opt != IP_XFRM_POLICY) {
2696 *dir = -EOPNOTSUPP;
2697 return NULL;
2698 }
2699 break;
dfd56b8b 2700#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2701 case AF_INET6:
2702 if (opt != IPV6_XFRM_POLICY) {
2703 *dir = -EOPNOTSUPP;
2704 return NULL;
2705 }
2706 break;
2707#endif
2708 default:
2709 *dir = -EINVAL;
2710 return NULL;
2711 }
2712
2713 *dir = -EINVAL;
2714
2715 if (len < sizeof(*p) ||
2716 verify_newpolicy_info(p))
2717 return NULL;
2718
2719 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2720 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2721 return NULL;
2722
a4f1bac6
HX		 2723 if (p->dir > XFRM_POLICY_OUT)
2724 return NULL;
2725
2f09a4d5 2726 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2727 if (xp == NULL) {
2728 *dir = -ENOBUFS;
2729 return NULL;
2730 }
2731
2732 copy_from_user_policy(xp, p);
f7b6983f 2733 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2734 copy_templates(xp, ut, nr);
2735
2736 *dir = p->dir;
2737
2738 return xp;
2739}
2740
7deb2264
TG		 2741static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2742{
2743 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2744 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2745 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2746 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2747 + userpolicy_type_attrsize();
2748}
2749
1da177e4 2750static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2751 int dir, const struct km_event *c)
1da177e4
LT		 2752{
2753 struct xfrm_user_polexpire *upe;
d51d081d 2754 int hard = c->data.hard;
1d1e34dd
DM		 2755 struct nlmsghdr *nlh;
2756 int err;
1da177e4 2757
15e47304 2758 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
79b8b7f4
TG		 2759 if (nlh == NULL)
2760 return -EMSGSIZE;
1da177e4 2761
7b67c857 2762 upe = nlmsg_data(nlh);
1da177e4 2763 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2764 err = copy_to_user_tmpl(xp, skb);
2765 if (!err)
2766 err = copy_to_user_sec_ctx(xp, skb);
2767 if (!err)
2768 err = copy_to_user_policy_type(xp->type, skb);
2769 if (!err)
2770 err = xfrm_mark_put(skb, &xp->mark);
2771 if (err) {
2772 nlmsg_cancel(skb, nlh);
2773 return err;
2774 }
1da177e4
LT		 2775 upe->hard = !!hard;
2776
9825069d 2777 return nlmsg_end(skb, nlh);
1da177e4
LT		 2778}
2779
214e005b 2780static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2781{
fc34acd3 2782 struct net *net = xp_net(xp);
1da177e4 2783 struct sk_buff *skb;
1da177e4 2784
7deb2264 2785 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2786 if (skb == NULL)
2787 return -ENOMEM;
2788
d51d081d 2789 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2790 BUG();
2791
a6483b79 2792 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2793}
2794
214e005b 2795static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2796{
1d1e34dd 2797 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2798 struct net *net = xp_net(xp);
26b15dad 2799 struct xfrm_userpolicy_info *p;
0603eac0 2800 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2801 struct nlmsghdr *nlh;
2802 struct sk_buff *skb;
1d1e34dd 2803 int headlen, err;
0603eac0
HX		 2804
2805 headlen = sizeof(*p);
2806 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2807 len += nla_total_size(headlen);
0603eac0
HX		 2808 headlen = sizeof(*id);
2809 }
cfbfd45a 2810 len += userpolicy_type_attrsize();
295fae56 2811 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2812 len += NLMSG_ALIGN(headlen);
26b15dad 2813
7deb2264 2814 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2815 if (skb == NULL)
2816 return -ENOMEM;
26b15dad 2817
15e47304 2818 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2819 err = -EMSGSIZE;
79b8b7f4 2820 if (nlh == NULL)
1d1e34dd 2821 goto out_free_skb;
26b15dad 2822
7b67c857 2823 p = nlmsg_data(nlh);
0603eac0 2824 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2825 struct nlattr *attr;
2826
7b67c857 2827 id = nlmsg_data(nlh);
0603eac0
HX		 2828 memset(id, 0, sizeof(*id));
2829 id->dir = dir;
2830 if (c->data.byid)
2831 id->index = xp->index;
2832 else
2833 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2834
c0144bea 2835 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2836 err = -EMSGSIZE;
c0144bea 2837 if (attr == NULL)
1d1e34dd 2838 goto out_free_skb;
c0144bea
TG		 2839
2840 p = nla_data(attr);
0603eac0 2841 }
26b15dad 2842
26b15dad 2843 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2844 err = copy_to_user_tmpl(xp, skb);
2845 if (!err)
2846 err = copy_to_user_policy_type(xp->type, skb);
2847 if (!err)
2848 err = xfrm_mark_put(skb, &xp->mark);
2849 if (err)
2850 goto out_free_skb;
295fae56 2851
9825069d 2852 nlmsg_end(skb, nlh);
26b15dad 2853
a6483b79 2854 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2855
1d1e34dd 2856out_free_skb:
26b15dad 2857 kfree_skb(skb);
1d1e34dd 2858 return err;
26b15dad
JHS		 2859}
2860
214e005b 2861static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2862{
7067802e 2863 struct net *net = c->net;
26b15dad
JHS		 2864 struct nlmsghdr *nlh;
2865 struct sk_buff *skb;
1d1e34dd 2866 int err;
26b15dad 2867
7deb2264 2868 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2869 if (skb == NULL)
2870 return -ENOMEM;
26b15dad 2871
15e47304 2872 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2873 err = -EMSGSIZE;
79b8b7f4 2874 if (nlh == NULL)
1d1e34dd
DM		 2875 goto out_free_skb;
2876 err = copy_to_user_policy_type(c->data.type, skb);
2877 if (err)
2878 goto out_free_skb;
26b15dad 2879
9825069d 2880 nlmsg_end(skb, nlh);
26b15dad 2881
a6483b79 2882 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2883
1d1e34dd 2884out_free_skb:
26b15dad 2885 kfree_skb(skb);
1d1e34dd 2886 return err;
26b15dad
JHS		 2887}
2888
214e005b 2889static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2890{
2891
2892 switch (c->event) {
f60f6b8f
HX		 2893 case XFRM_MSG_NEWPOLICY:
2894 case XFRM_MSG_UPDPOLICY:
2895 case XFRM_MSG_DELPOLICY:
26b15dad 2896 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2897 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2898 return xfrm_notify_policy_flush(c);
f60f6b8f 2899 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2900 return xfrm_exp_policy_notify(xp, dir, c);
2901 default:
62db5cfd 2902 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2903 c->event);
26b15dad
JHS		 2904 }
2905
2906 return 0;
2907
2908}
2909
7deb2264
TG		 2910static inline size_t xfrm_report_msgsize(void)
2911{
2912 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2913}
2914
97a64b45
MN		 2915static int build_report(struct sk_buff *skb, u8 proto,
2916 struct xfrm_selector *sel, xfrm_address_t *addr)
2917{
2918 struct xfrm_user_report *ur;
2919 struct nlmsghdr *nlh;
97a64b45 2920
79b8b7f4
TG		 2921 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2922 if (nlh == NULL)
2923 return -EMSGSIZE;
97a64b45 2924
7b67c857 2925 ur = nlmsg_data(nlh);
97a64b45
MN		 2926 ur->proto = proto;
2927 memcpy(&ur->sel, sel, sizeof(ur->sel));
2928
1d1e34dd
DM		 2929 if (addr) {
2930 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2931 if (err) {
2932 nlmsg_cancel(skb, nlh);
2933 return err;
2934 }
2935 }
9825069d 2936 return nlmsg_end(skb, nlh);
97a64b45
MN		 2937}
2938
db983c11
AD		 2939static int xfrm_send_report(struct net *net, u8 proto,
2940 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2941{
2942 struct sk_buff *skb;
97a64b45 2943
7deb2264 2944 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2945 if (skb == NULL)
2946 return -ENOMEM;
2947
2948 if (build_report(skb, proto, sel, addr) < 0)
2949 BUG();
2950
a6483b79 2951 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
97a64b45
MN		 2952}
2953
3a2dfbe8
MW		 2954static inline size_t xfrm_mapping_msgsize(void)
2955{
2956 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2957}
2958
2959static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2960 xfrm_address_t *new_saddr, __be16 new_sport)
2961{
2962 struct xfrm_user_mapping *um;
2963 struct nlmsghdr *nlh;
2964
2965 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2966 if (nlh == NULL)
2967 return -EMSGSIZE;
2968
2969 um = nlmsg_data(nlh);
2970
2971 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2972 um->id.spi = x->id.spi;
2973 um->id.family = x->props.family;
2974 um->id.proto = x->id.proto;
2975 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2976 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2977 um->new_sport = new_sport;
2978 um->old_sport = x->encap->encap_sport;
2979 um->reqid = x->props.reqid;
2980
2981 return nlmsg_end(skb, nlh);
2982}
2983
2984static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2985 __be16 sport)
2986{
a6483b79 2987 struct net *net = xs_net(x);
3a2dfbe8
MW		 2988 struct sk_buff *skb;
2989
2990 if (x->id.proto != IPPROTO_ESP)
2991 return -EINVAL;
2992
2993 if (!x->encap)
2994 return -EINVAL;
2995
2996 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2997 if (skb == NULL)
2998 return -ENOMEM;
2999
3000 if (build_mapping(skb, x, ipaddr, sport) < 0)
3001 BUG();
3002
a6483b79 3003 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
3a2dfbe8
MW		 3004}
3005
0f24558e
HG		 3006static bool xfrm_is_alive(const struct km_event *c)
3007{
3008 return (bool)xfrm_acquire_is_on(c->net);
3009}
3010
1da177e4
LT		 3011static struct xfrm_mgr netlink_mgr = {
3012 .id = "netlink",
3013 .notify = xfrm_send_state_notify,
3014 .acquire = xfrm_send_acquire,
3015 .compile_policy = xfrm_compile_policy,
3016 .notify_policy = xfrm_send_policy_notify,
97a64b45 3017 .report = xfrm_send_report,
5c79de6e 3018 .migrate = xfrm_send_migrate,
3a2dfbe8 3019 .new_mapping = xfrm_send_mapping,
0f24558e 3020 .is_alive = xfrm_is_alive,
1da177e4
LT		 3021};
3022
a6483b79 3023static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 3024{
be33690d 3025 struct sock *nlsk;
a31f2d17
PNA		 3026 struct netlink_kernel_cfg cfg = {
3027 .groups = XFRMNLGRP_MAX,
3028 .input = xfrm_netlink_rcv,
3029 };
be33690d 3030
9f00d977 3031 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
be33690d 3032 if (nlsk == NULL)
1da177e4 3033 return -ENOMEM;
d79d792e 3034 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 3035 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 3036 return 0;
3037}
3038
d79d792e 3039static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 3040{
d79d792e
EB		 3041 struct net *net;
3042 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 3043 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 3044 synchronize_net();
3045 list_for_each_entry(net, net_exit_list, exit_list)
3046 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 3047}
3048
a6483b79 3049static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 3050 .init = xfrm_user_net_init,
3051 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 3052};
3053
3054static int __init xfrm_user_init(void)
3055{
3056 int rv;
3057
3058 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3059
3060 rv = register_pernet_subsys(&xfrm_user_net_ops);
3061 if (rv < 0)
3062 return rv;
3063 rv = xfrm_register_km(&netlink_mgr);
3064 if (rv < 0)
3065 unregister_pernet_subsys(&xfrm_user_net_ops);
3066 return rv;
3067}
3068
3069static void __exit xfrm_user_exit(void)
3070{
3071 xfrm_unregister_km(&netlink_mgr);
3072 unregister_pernet_subsys(&xfrm_user_net_ops);
3073}
3074
1da177e4
LT		 3075module_init(xfrm_user_init);
3076module_exit(xfrm_user_exit);
3077MODULE_LICENSE("GPL");
4fdb3bb7 3078MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3079
Linux 6.x block layer and io_uring tree(s)