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[mirror_ubuntu-bionic-kernel.git] / net / xfrm / xfrm_user.c
CommitLineData
1da177e4
LT		 1/* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
df71837d 10 *
1da177e4
LT		 11 */
12
9409f38a 13#include <linux/crypto.h>
1da177e4
LT		 14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/net.h>
21#include <linux/skbuff.h>
1da177e4
LT		 22#include <linux/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
88fc2c84 28#include <net/netlink.h>
fa6dd8a2 29#include <net/ah.h>
1da177e4 30#include <asm/uaccess.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 32#include <linux/in6.h>
33#endif
e33d4f13 34#include <asm/unaligned.h>
1da177e4 35
5424f32e 36static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 37{
5424f32e 38 struct nlattr *rt = attrs[type];
1da177e4
LT		 39 struct xfrm_algo *algp;
40
41 if (!rt)
42 return 0;
43
5424f32e 44 algp = nla_data(rt);
0f99be0d 45 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 46 return -EINVAL;
47
1da177e4
LT		 48 switch (type) {
49 case XFRMA_ALG_AUTH:
1da177e4 50 case XFRMA_ALG_CRYPT:
1da177e4 51 case XFRMA_ALG_COMP:
1da177e4
LT		 52 break;
53
54 default:
55 return -EINVAL;
3ff50b79 56 }
1da177e4
LT		 57
58 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
59 return 0;
60}
61
4447bb33
MW		 62static int verify_auth_trunc(struct nlattr **attrs)
63{
64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
65 struct xfrm_algo_auth *algp;
66
67 if (!rt)
68 return 0;
69
70 algp = nla_data(rt);
71 if (nla_len(rt) < xfrm_alg_auth_len(algp))
72 return -EINVAL;
73
74 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
75 return 0;
76}
77
1a6509d9
HX		 78static int verify_aead(struct nlattr **attrs)
79{
80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
81 struct xfrm_algo_aead *algp;
82
83 if (!rt)
84 return 0;
85
86 algp = nla_data(rt);
87 if (nla_len(rt) < aead_len(algp))
88 return -EINVAL;
89
90 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
91 return 0;
92}
93
5424f32e 94static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 95 xfrm_address_t **addrp)
96{
5424f32e 97 struct nlattr *rt = attrs[type];
eb2971b6 98
cf5cb79f 99 if (rt && addrp)
5424f32e 100 *addrp = nla_data(rt);
eb2971b6 101}
df71837d 102
5424f32e 103static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 104{
5424f32e 105 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 106 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 107
108 if (!rt)
109 return 0;
110
5424f32e 111 uctx = nla_data(rt);
cf5cb79f 112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 113 return -EINVAL;
114
115 return 0;
116}
117
d8647b79
SK		 118static inline int verify_replay(struct xfrm_usersa_info *p,
119 struct nlattr **attrs)
120{
121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
ecd79187 122 struct xfrm_replay_state_esn *rs;
d8647b79 123
ecd79187
MK		 124 if (p->flags & XFRM_STATE_ESN) {
125 if (!rt)
126 return -EINVAL;
127
128 rs = nla_data(rt);
129
130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
131 return -EINVAL;
132
133 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
134 nla_len(rt) != sizeof(*rs))
135 return -EINVAL;
136 }
7833aa05 137
d8647b79
SK		 138 if (!rt)
139 return 0;
140
01714109
FD		 141 /* As only ESP and AH support ESN feature. */
142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
02aadf72
SK		 143 return -EINVAL;
144
d8647b79
SK		 145 if (p->replay_window != 0)
146 return -EINVAL;
147
148 return 0;
149}
df71837d 150
1da177e4 151static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 152 struct nlattr **attrs)
1da177e4
LT		 153{
154 int err;
155
156 err = -EINVAL;
157 switch (p->family) {
158 case AF_INET:
159 break;
160
161 case AF_INET6:
dfd56b8b 162#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 163 break;
164#else
165 err = -EAFNOSUPPORT;
166 goto out;
167#endif
168
169 default:
170 goto out;
3ff50b79 171 }
1da177e4
LT		 172
173 err = -EINVAL;
174 switch (p->id.proto) {
175 case IPPROTO_AH:
4447bb33
MW		 176 if ((!attrs[XFRMA_ALG_AUTH] &&
177 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 178 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 179 attrs[XFRMA_ALG_CRYPT] ||
35d2856b 180 attrs[XFRMA_ALG_COMP] ||
a0e5ef53 181 attrs[XFRMA_TFCPAD])
1da177e4
LT		 182 goto out;
183 break;
184
185 case IPPROTO_ESP:
1a6509d9
HX		 186 if (attrs[XFRMA_ALG_COMP])
187 goto out;
188 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 189 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 190 !attrs[XFRMA_ALG_CRYPT] &&
191 !attrs[XFRMA_ALG_AEAD])
192 goto out;
193 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 194 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 195 attrs[XFRMA_ALG_CRYPT]) &&
196 attrs[XFRMA_ALG_AEAD])
1da177e4 197 goto out;
35d2856b
MW		 198 if (attrs[XFRMA_TFCPAD] &&
199 p->mode != XFRM_MODE_TUNNEL)
200 goto out;
1da177e4
LT		 201 break;
202
203 case IPPROTO_COMP:
35a7aa08 204 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 205 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 206 attrs[XFRMA_ALG_AUTH] ||
4447bb33 207 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b 208 attrs[XFRMA_ALG_CRYPT] ||
a0e5ef53
TB		 209 attrs[XFRMA_TFCPAD] ||
210 (ntohl(p->id.spi) >= 0x10000))
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
69b0137f
HX		 293static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
294{
295 struct xfrm_algo *p, *ualg;
296 struct xfrm_algo_desc *algo;
297
298 if (!rta)
299 return 0;
300
301 ualg = nla_data(rta);
302
303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
304 if (!algo)
305 return -ENOSYS;
306 x->props.ealgo = algo->desc.sadb_alg_id;
307
308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
309 if (!p)
310 return -ENOMEM;
311
312 strcpy(p->alg_name, algo->name);
313 x->ealg = p;
314 x->geniv = algo->uinfo.encr.geniv;
315 return 0;
316}
317
4447bb33
MW		 318static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
319 struct nlattr *rta)
320{
321 struct xfrm_algo *ualg;
322 struct xfrm_algo_auth *p;
323 struct xfrm_algo_desc *algo;
324
325 if (!rta)
326 return 0;
327
328 ualg = nla_data(rta);
329
330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
331 if (!algo)
332 return -ENOSYS;
333 *props = algo->desc.sadb_alg_id;
334
335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
336 if (!p)
337 return -ENOMEM;
338
339 strcpy(p->alg_name, algo->name);
340 p->alg_key_len = ualg->alg_key_len;
341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
343
344 *algpp = p;
345 return 0;
346}
347
348static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
349 struct nlattr *rta)
350{
351 struct xfrm_algo_auth *p, *ualg;
352 struct xfrm_algo_desc *algo;
353
354 if (!rta)
355 return 0;
356
357 ualg = nla_data(rta);
358
359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
360 if (!algo)
361 return -ENOSYS;
689f1c9d 362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 363 return -EINVAL;
364 *props = algo->desc.sadb_alg_id;
365
366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
367 if (!p)
368 return -ENOMEM;
369
370 strcpy(p->alg_name, algo->name);
371 if (!p->alg_trunc_len)
372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
373
374 *algpp = p;
375 return 0;
376}
377
69b0137f 378static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
1a6509d9
HX		 379{
380 struct xfrm_algo_aead *p, *ualg;
381 struct xfrm_algo_desc *algo;
382
383 if (!rta)
384 return 0;
385
386 ualg = nla_data(rta);
387
388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
389 if (!algo)
390 return -ENOSYS;
69b0137f 391 x->props.ealgo = algo->desc.sadb_alg_id;
1a6509d9
HX		 392
393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
394 if (!p)
395 return -ENOMEM;
396
397 strcpy(p->alg_name, algo->name);
69b0137f
HX		 398 x->aead = p;
399 x->geniv = algo->uinfo.aead.geniv;
1a6509d9
HX		 400 return 0;
401}
402
e2b19125
SK		 403static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
404 struct nlattr *rp)
405{
406 struct xfrm_replay_state_esn *up;
ecd79187 407 int ulen;
e2b19125
SK		 408
409 if (!replay_esn || !rp)
410 return 0;
411
412 up = nla_data(rp);
ecd79187 413 ulen = xfrm_replay_state_esn_len(up);
e2b19125 414
ecd79187 415 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
e2b19125
SK		 416 return -EINVAL;
417
418 return 0;
419}
420
d8647b79
SK		 421static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
422 struct xfrm_replay_state_esn **preplay_esn,
423 struct nlattr *rta)
424{
425 struct xfrm_replay_state_esn *p, *pp, *up;
ecd79187 426 int klen, ulen;
d8647b79
SK		 427
428 if (!rta)
429 return 0;
430
431 up = nla_data(rta);
ecd79187
MK		 432 klen = xfrm_replay_state_esn_len(up);
433 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
d8647b79 434
ecd79187 435 p = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 436 if (!p)
437 return -ENOMEM;
438
ecd79187 439 pp = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 440 if (!pp) {
441 kfree(p);
442 return -ENOMEM;
443 }
444
ecd79187
MK		 445 memcpy(p, up, ulen);
446 memcpy(pp, up, ulen);
447
d8647b79
SK		 448 *replay_esn = p;
449 *preplay_esn = pp;
450
451 return 0;
452}
453
661697f7 454static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 455{
df71837d
TJ		 456 int len = 0;
457
458 if (xfrm_ctx) {
459 len += sizeof(struct xfrm_user_sec_ctx);
460 len += xfrm_ctx->ctx_len;
461 }
462 return len;
463}
464
1da177e4
LT		 465static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
466{
467 memcpy(&x->id, &p->id, sizeof(x->id));
468 memcpy(&x->sel, &p->sel, sizeof(x->sel));
469 memcpy(&x->lft, &p->lft, sizeof(x->lft));
470 x->props.mode = p->mode;
33fce60d
FD		 471 x->props.replay_window = min_t(unsigned int, p->replay_window,
472 sizeof(x->replay.bitmap) * 8);
1da177e4
LT		 473 x->props.reqid = p->reqid;
474 x->props.family = p->family;
54489c14 475 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 476 x->props.flags = p->flags;
196b0036 477
ccf9b3b8 478 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 479 x->sel.family = p->family;
1da177e4
LT		 480}
481
d51d081d
JHS		 482/*
483 * someday when pfkey also has support, we could have the code
484 * somehow made shareable and move it to xfrm_state.c - JHS
485 *
486*/
e3ac104d
MK		 487static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
488 int update_esn)
d51d081d 489{
5424f32e 490 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
e3ac104d 491 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
5424f32e
TG		 492 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
493 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
494 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 495
d8647b79
SK		 496 if (re) {
497 struct xfrm_replay_state_esn *replay_esn;
498 replay_esn = nla_data(re);
499 memcpy(x->replay_esn, replay_esn,
500 xfrm_replay_state_esn_len(replay_esn));
501 memcpy(x->preplay_esn, replay_esn,
502 xfrm_replay_state_esn_len(replay_esn));
503 }
504
d51d081d
JHS		 505 if (rp) {
506 struct xfrm_replay_state *replay;
5424f32e 507 replay = nla_data(rp);
d51d081d
JHS		 508 memcpy(&x->replay, replay, sizeof(*replay));
509 memcpy(&x->preplay, replay, sizeof(*replay));
510 }
511
512 if (lt) {
513 struct xfrm_lifetime_cur *ltime;
5424f32e 514 ltime = nla_data(lt);
d51d081d
JHS		 515 x->curlft.bytes = ltime->bytes;
516 x->curlft.packets = ltime->packets;
517 x->curlft.add_time = ltime->add_time;
518 x->curlft.use_time = ltime->use_time;
519 }
520
cf5cb79f 521 if (et)
5424f32e 522 x->replay_maxage = nla_get_u32(et);
d51d081d 523
cf5cb79f 524 if (rt)
5424f32e 525 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 526}
527
fc34acd3
AD		 528static struct xfrm_state *xfrm_state_construct(struct net *net,
529 struct xfrm_usersa_info *p,
5424f32e 530 struct nlattr **attrs,
1da177e4
LT		 531 int *errp)
532{
fc34acd3 533 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 534 int err = -ENOMEM;
535
536 if (!x)
537 goto error_no_put;
538
539 copy_from_user_state(x, p);
540
a947b0a9
ND		 541 if (attrs[XFRMA_SA_EXTRA_FLAGS])
542 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
543
69b0137f 544 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
1a6509d9 545 goto error;
4447bb33
MW		 546 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
547 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 548 goto error;
4447bb33
MW		 549 if (!x->props.aalgo) {
550 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
551 attrs[XFRMA_ALG_AUTH])))
552 goto error;
553 }
69b0137f 554 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 555 goto error;
556 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
557 xfrm_calg_get_byname,
35a7aa08 558 attrs[XFRMA_ALG_COMP])))
1da177e4 559 goto error;
fd21150a
TG		 560
561 if (attrs[XFRMA_ENCAP]) {
562 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
563 sizeof(*x->encap), GFP_KERNEL);
564 if (x->encap == NULL)
565 goto error;
566 }
567
35d2856b
MW		 568 if (attrs[XFRMA_TFCPAD])
569 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
570
fd21150a
TG		 571 if (attrs[XFRMA_COADDR]) {
572 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
573 sizeof(*x->coaddr), GFP_KERNEL);
574 if (x->coaddr == NULL)
575 goto error;
576 }
577
6f26b61e
JHS		 578 xfrm_mark_get(attrs, &x->mark);
579
a454f0cc 580 err = __xfrm_init_state(x, false);
1da177e4
LT		 581 if (err)
582 goto error;
583
2f30ea50
MK		 584 if (attrs[XFRMA_SEC_CTX]) {
585 err = security_xfrm_state_alloc(x,
586 nla_data(attrs[XFRMA_SEC_CTX]));
587 if (err)
588 goto error;
589 }
df71837d 590
d8647b79
SK		 591 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
592 attrs[XFRMA_REPLAY_ESN_VAL])))
593 goto error;
594
1da177e4 595 x->km.seq = p->seq;
b27aeadb 596 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 597 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 598 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 599
9fdc4883
SK		 600 if ((err = xfrm_init_replay(x)))
601 goto error;
d51d081d 602
9fdc4883 603 /* override default values from above */
e3ac104d 604 xfrm_update_ae_params(x, attrs, 0);
1da177e4
LT		 605
606 return x;
607
608error:
609 x->km.state = XFRM_STATE_DEAD;
610 xfrm_state_put(x);
611error_no_put:
612 *errp = err;
613 return NULL;
614}
615
22e70050 616static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 617 struct nlattr **attrs)
1da177e4 618{
fc34acd3 619 struct net *net = sock_net(skb->sk);
7b67c857 620 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 621 struct xfrm_state *x;
622 int err;
26b15dad 623 struct km_event c;
1da177e4 624
35a7aa08 625 err = verify_newsa_info(p, attrs);
1da177e4
LT		 626 if (err)
627 return err;
628
fc34acd3 629 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 630 if (!x)
631 return err;
632
26b15dad 633 xfrm_state_hold(x);
1da177e4
LT		 634 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
635 err = xfrm_state_add(x);
636 else
637 err = xfrm_state_update(x);
638
2e71029e 639 xfrm_audit_state_add(x, err ? 0 : 1, true);
161a09e7 640
1da177e4
LT		 641 if (err < 0) {
642 x->km.state = XFRM_STATE_DEAD;
21380b81 643 __xfrm_state_put(x);
7d6dfe1f 644 goto out;
1da177e4
LT		 645 }
646
26b15dad 647 c.seq = nlh->nlmsg_seq;
15e47304 648 c.portid = nlh->nlmsg_pid;
f60f6b8f 649 c.event = nlh->nlmsg_type;
26b15dad
JHS		 650
651 km_state_notify(x, &c);
7d6dfe1f 652out:
26b15dad 653 xfrm_state_put(x);
1da177e4
LT		 654 return err;
655}
656
fc34acd3
AD		 657static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
658 struct xfrm_usersa_id *p,
5424f32e 659 struct nlattr **attrs,
eb2971b6
MN		 660 int *errp)
661{
662 struct xfrm_state *x = NULL;
6f26b61e 663 struct xfrm_mark m;
eb2971b6 664 int err;
6f26b61e 665 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 666
667 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
668 err = -ESRCH;
6f26b61e 669 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 670 } else {
671 xfrm_address_t *saddr = NULL;
672
35a7aa08 673 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 674 if (!saddr) {
675 err = -EINVAL;
676 goto out;
677 }
678
9abbffee 679 err = -ESRCH;
6f26b61e
JHS		 680 x = xfrm_state_lookup_byaddr(net, mark,
681 &p->daddr, saddr,
221df1ed 682 p->proto, p->family);
eb2971b6
MN		 683 }
684
685 out:
686 if (!x && errp)
687 *errp = err;
688 return x;
689}
690
22e70050 691static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 692 struct nlattr **attrs)
1da177e4 693{
fc34acd3 694 struct net *net = sock_net(skb->sk);
1da177e4 695 struct xfrm_state *x;
eb2971b6 696 int err = -ESRCH;
26b15dad 697 struct km_event c;
7b67c857 698 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4 699
fc34acd3 700 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 701 if (x == NULL)
eb2971b6 702 return err;
1da177e4 703
6f68dc37 704 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 705 goto out;
706
1da177e4 707 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 708 err = -EPERM;
709 goto out;
1da177e4
LT		 710 }
711
26b15dad 712 err = xfrm_state_delete(x);
161a09e7 713
c8c05a8e
CZ		 714 if (err < 0)
715 goto out;
26b15dad
JHS		 716
717 c.seq = nlh->nlmsg_seq;
15e47304 718 c.portid = nlh->nlmsg_pid;
f60f6b8f 719 c.event = nlh->nlmsg_type;
26b15dad 720 km_state_notify(x, &c);
1da177e4 721
c8c05a8e 722out:
2e71029e 723 xfrm_audit_state_delete(x, err ? 0 : 1, true);
c8c05a8e 724 xfrm_state_put(x);
26b15dad 725 return err;
1da177e4
LT		 726}
727
728static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
729{
f778a636 730 memset(p, 0, sizeof(*p));
1da177e4
LT		 731 memcpy(&p->id, &x->id, sizeof(p->id));
732 memcpy(&p->sel, &x->sel, sizeof(p->sel));
733 memcpy(&p->lft, &x->lft, sizeof(p->lft));
734 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
e33d4f13
SV		 735 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
736 put_unaligned(x->stats.replay, &p->stats.replay);
737 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
54489c14 738 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 739 p->mode = x->props.mode;
740 p->replay_window = x->props.replay_window;
741 p->reqid = x->props.reqid;
742 p->family = x->props.family;
743 p->flags = x->props.flags;
744 p->seq = x->km.seq;
745}
746
747struct xfrm_dump_info {
748 struct sk_buff *in_skb;
749 struct sk_buff *out_skb;
750 u32 nlmsg_seq;
751 u16 nlmsg_flags;
1da177e4
LT		 752};
753
c0144bea
TG		 754static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
755{
c0144bea
TG		 756 struct xfrm_user_sec_ctx *uctx;
757 struct nlattr *attr;
68325d3b 758 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 759
760 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
761 if (attr == NULL)
762 return -EMSGSIZE;
763
764 uctx = nla_data(attr);
765 uctx->exttype = XFRMA_SEC_CTX;
766 uctx->len = ctx_size;
767 uctx->ctx_doi = s->ctx_doi;
768 uctx->ctx_alg = s->ctx_alg;
769 uctx->ctx_len = s->ctx_len;
770 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
771
772 return 0;
773}
774
4447bb33
MW		 775static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
776{
777 struct xfrm_algo *algo;
778 struct nlattr *nla;
779
780 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
781 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
782 if (!nla)
783 return -EMSGSIZE;
784
785 algo = nla_data(nla);
4c87308b 786 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 787 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
788 algo->alg_key_len = auth->alg_key_len;
789
790 return 0;
791}
792
68325d3b
HX		 793/* Don't change this without updating xfrm_sa_len! */
794static int copy_to_user_state_extra(struct xfrm_state *x,
795 struct xfrm_usersa_info *p,
796 struct sk_buff *skb)
1da177e4 797{
1d1e34dd 798 int ret = 0;
d0fde795 799
1d1e34dd 800 copy_to_user_state(x, p);
68325d3b 801
a947b0a9
ND		 802 if (x->props.extra_flags) {
803 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
804 x->props.extra_flags);
805 if (ret)
806 goto out;
807 }
808
1d1e34dd
DM		 809 if (x->coaddr) {
810 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
811 if (ret)
812 goto out;
813 }
814 if (x->lastused) {
de95c4a4
ND		 815 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
816 XFRMA_PAD);
1d1e34dd
DM		 817 if (ret)
818 goto out;
819 }
820 if (x->aead) {
821 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
822 if (ret)
823 goto out;
824 }
825 if (x->aalg) {
826 ret = copy_to_user_auth(x->aalg, skb);
827 if (!ret)
828 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
829 xfrm_alg_auth_len(x->aalg), x->aalg);
830 if (ret)
831 goto out;
832 }
833 if (x->ealg) {
834 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
835 if (ret)
836 goto out;
837 }
838 if (x->calg) {
839 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
840 if (ret)
841 goto out;
842 }
843 if (x->encap) {
844 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
845 if (ret)
846 goto out;
847 }
848 if (x->tfcpad) {
849 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
850 if (ret)
851 goto out;
852 }
853 ret = xfrm_mark_put(skb, &x->mark);
854 if (ret)
855 goto out;
f293a5e3 856 if (x->replay_esn)
1d1e34dd
DM		 857 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
858 xfrm_replay_state_esn_len(x->replay_esn),
859 x->replay_esn);
f293a5e3 860 else
861 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
862 &x->replay);
863 if (ret)
864 goto out;
1d1e34dd
DM		 865 if (x->security)
866 ret = copy_sec_ctx(x->security, skb);
867out:
868 return ret;
68325d3b
HX		 869}
870
871static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
872{
873 struct xfrm_dump_info *sp = ptr;
874 struct sk_buff *in_skb = sp->in_skb;
875 struct sk_buff *skb = sp->out_skb;
876 struct xfrm_usersa_info *p;
877 struct nlmsghdr *nlh;
878 int err;
879
15e47304 880 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
68325d3b
HX		 881 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
882 if (nlh == NULL)
883 return -EMSGSIZE;
884
885 p = nlmsg_data(nlh);
886
887 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 888 if (err) {
889 nlmsg_cancel(skb, nlh);
890 return err;
891 }
9825069d 892 nlmsg_end(skb, nlh);
1da177e4 893 return 0;
1da177e4
LT		 894}
895
4c563f76
TT		 896static int xfrm_dump_sa_done(struct netlink_callback *cb)
897{
898 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
283bc9f3
FD		 899 struct sock *sk = cb->skb->sk;
900 struct net *net = sock_net(sk);
901
1ba5bf99
VN		 902 if (cb->args[0])
903 xfrm_state_walk_done(walk, net);
4c563f76
TT		 904 return 0;
905}
906
d3623099 907static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1da177e4
LT		 908static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
909{
fc34acd3 910 struct net *net = sock_net(skb->sk);
4c563f76 911 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 912 struct xfrm_dump_info info;
913
4c563f76
TT		 914 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
915 sizeof(cb->args) - sizeof(cb->args[0]));
916
1da177e4
LT		 917 info.in_skb = cb->skb;
918 info.out_skb = skb;
919 info.nlmsg_seq = cb->nlh->nlmsg_seq;
920 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 921
922 if (!cb->args[0]) {
d3623099 923 struct nlattr *attrs[XFRMA_MAX+1];
870a2df4 924 struct xfrm_address_filter *filter = NULL;
d3623099
ND		 925 u8 proto = 0;
926 int err;
927
d3623099
ND		 928 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
929 xfrma_policy);
930 if (err < 0)
931 return err;
932
870a2df4 933 if (attrs[XFRMA_ADDRESS_FILTER]) {
df367561
AH		 934 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
935 sizeof(*filter), GFP_KERNEL);
d3623099
ND		 936 if (filter == NULL)
937 return -ENOMEM;
d3623099
ND		 938 }
939
940 if (attrs[XFRMA_PROTO])
941 proto = nla_get_u8(attrs[XFRMA_PROTO]);
942
943 xfrm_state_walk_init(walk, proto, filter);
1ba5bf99 944 cb->args[0] = 1;
4c563f76
TT		 945 }
946
fc34acd3 947 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 948
949 return skb->len;
950}
951
952static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
953 struct xfrm_state *x, u32 seq)
954{
955 struct xfrm_dump_info info;
956 struct sk_buff *skb;
864745d2 957 int err;
1da177e4 958
7deb2264 959 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 960 if (!skb)
961 return ERR_PTR(-ENOMEM);
962
1da177e4
LT		 963 info.in_skb = in_skb;
964 info.out_skb = skb;
965 info.nlmsg_seq = seq;
966 info.nlmsg_flags = 0;
1da177e4 967
864745d2
MK		 968 err = dump_one_state(x, 0, &info);
969 if (err) {
1da177e4 970 kfree_skb(skb);
864745d2 971 return ERR_PTR(err);
1da177e4
LT		 972 }
973
974 return skb;
975}
976
21ee543e
MK		 977/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
978 * Must be called with RCU read lock.
979 */
980static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
981 u32 pid, unsigned int group)
982{
983 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
984
985 if (nlsk)
986 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
987 else
988 return -1;
989}
990
7deb2264
TG		 991static inline size_t xfrm_spdinfo_msgsize(void)
992{
993 return NLMSG_ALIGN(4)
994 + nla_total_size(sizeof(struct xfrmu_spdinfo))
880a6fab
CG		 995 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
996 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
997 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
7deb2264
TG		 998}
999
e071041b 1000static int build_spdinfo(struct sk_buff *skb, struct net *net,
15e47304 1001 u32 portid, u32 seq, u32 flags)
ecfd6b18 1002{
5a6d3416
JHS		 1003 struct xfrmk_spdinfo si;
1004 struct xfrmu_spdinfo spc;
1005 struct xfrmu_spdhinfo sph;
880a6fab 1006 struct xfrmu_spdhthresh spt4, spt6;
ecfd6b18 1007 struct nlmsghdr *nlh;
1d1e34dd 1008 int err;
ecfd6b18 1009 u32 *f;
880a6fab 1010 unsigned lseq;
ecfd6b18 1011
15e47304 1012 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 1013 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 1014 return -EMSGSIZE;
1015
1016 f = nlmsg_data(nlh);
1017 *f = flags;
e071041b 1018 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 1019 spc.incnt = si.incnt;
1020 spc.outcnt = si.outcnt;
1021 spc.fwdcnt = si.fwdcnt;
1022 spc.inscnt = si.inscnt;
1023 spc.outscnt = si.outscnt;
1024 spc.fwdscnt = si.fwdscnt;
1025 sph.spdhcnt = si.spdhcnt;
1026 sph.spdhmcnt = si.spdhmcnt;
1027
880a6fab
CG		 1028 do {
1029 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1030
1031 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1032 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1033 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1034 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1035 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1036
1d1e34dd
DM		 1037 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1038 if (!err)
1039 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
880a6fab
CG		 1040 if (!err)
1041 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1042 if (!err)
1043 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1d1e34dd
DM		 1044 if (err) {
1045 nlmsg_cancel(skb, nlh);
1046 return err;
1047 }
ecfd6b18 1048
053c095a
JB		 1049 nlmsg_end(skb, nlh);
1050 return 0;
ecfd6b18
JHS		 1051}
1052
880a6fab
CG		 1053static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1054 struct nlattr **attrs)
1055{
1056 struct net *net = sock_net(skb->sk);
1057 struct xfrmu_spdhthresh *thresh4 = NULL;
1058 struct xfrmu_spdhthresh *thresh6 = NULL;
1059
1060 /* selector prefixlen thresholds to hash policies */
1061 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1062 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1063
1064 if (nla_len(rta) < sizeof(*thresh4))
1065 return -EINVAL;
1066 thresh4 = nla_data(rta);
1067 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1068 return -EINVAL;
1069 }
1070 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1071 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1072
1073 if (nla_len(rta) < sizeof(*thresh6))
1074 return -EINVAL;
1075 thresh6 = nla_data(rta);
1076 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1077 return -EINVAL;
1078 }
1079
1080 if (thresh4 || thresh6) {
1081 write_seqlock(&net->xfrm.policy_hthresh.lock);
1082 if (thresh4) {
1083 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1084 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1085 }
1086 if (thresh6) {
1087 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1088 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1089 }
1090 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1091
1092 xfrm_policy_hash_rebuild(net);
1093 }
1094
1095 return 0;
1096}
1097
ecfd6b18 1098static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1099 struct nlattr **attrs)
ecfd6b18 1100{
a6483b79 1101 struct net *net = sock_net(skb->sk);
ecfd6b18 1102 struct sk_buff *r_skb;
7b67c857 1103 u32 *flags = nlmsg_data(nlh);
15e47304 1104 u32 sportid = NETLINK_CB(skb).portid;
ecfd6b18 1105 u32 seq = nlh->nlmsg_seq;
ecfd6b18 1106
7deb2264 1107 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 1108 if (r_skb == NULL)
1109 return -ENOMEM;
1110
15e47304 1111 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
ecfd6b18
JHS		 1112 BUG();
1113
15e47304 1114 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
ecfd6b18
JHS		 1115}
1116
7deb2264
TG		 1117static inline size_t xfrm_sadinfo_msgsize(void)
1118{
1119 return NLMSG_ALIGN(4)
1120 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1121 + nla_total_size(4); /* XFRMA_SAD_CNT */
1122}
1123
e071041b 1124static int build_sadinfo(struct sk_buff *skb, struct net *net,
15e47304 1125 u32 portid, u32 seq, u32 flags)
28d8909b 1126{
af11e316
JHS		 1127 struct xfrmk_sadinfo si;
1128 struct xfrmu_sadhinfo sh;
28d8909b 1129 struct nlmsghdr *nlh;
1d1e34dd 1130 int err;
28d8909b
JHS		 1131 u32 *f;
1132
15e47304 1133 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 1134 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 1135 return -EMSGSIZE;
1136
1137 f = nlmsg_data(nlh);
1138 *f = flags;
e071041b 1139 xfrm_sad_getinfo(net, &si);
28d8909b 1140
af11e316
JHS		 1141 sh.sadhmcnt = si.sadhmcnt;
1142 sh.sadhcnt = si.sadhcnt;
1143
1d1e34dd
DM		 1144 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1145 if (!err)
1146 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1147 if (err) {
1148 nlmsg_cancel(skb, nlh);
1149 return err;
1150 }
28d8909b 1151
053c095a
JB		 1152 nlmsg_end(skb, nlh);
1153 return 0;
28d8909b
JHS		 1154}
1155
1156static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1157 struct nlattr **attrs)
28d8909b 1158{
a6483b79 1159 struct net *net = sock_net(skb->sk);
28d8909b 1160 struct sk_buff *r_skb;
7b67c857 1161 u32 *flags = nlmsg_data(nlh);
15e47304 1162 u32 sportid = NETLINK_CB(skb).portid;
28d8909b 1163 u32 seq = nlh->nlmsg_seq;
28d8909b 1164
7deb2264 1165 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1166 if (r_skb == NULL)
1167 return -ENOMEM;
1168
15e47304 1169 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
28d8909b
JHS		 1170 BUG();
1171
15e47304 1172 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
28d8909b
JHS		 1173}
1174
22e70050 1175static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1176 struct nlattr **attrs)
1da177e4 1177{
fc34acd3 1178 struct net *net = sock_net(skb->sk);
7b67c857 1179 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1180 struct xfrm_state *x;
1181 struct sk_buff *resp_skb;
eb2971b6 1182 int err = -ESRCH;
1da177e4 1183
fc34acd3 1184 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1185 if (x == NULL)
1186 goto out_noput;
1187
1188 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1189 if (IS_ERR(resp_skb)) {
1190 err = PTR_ERR(resp_skb);
1191 } else {
15e47304 1192 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1193 }
1194 xfrm_state_put(x);
1195out_noput:
1196 return err;
1197}
1198
22e70050 1199static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1200 struct nlattr **attrs)
1da177e4 1201{
fc34acd3 1202 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1203 struct xfrm_state *x;
1204 struct xfrm_userspi_info *p;
1205 struct sk_buff *resp_skb;
1206 xfrm_address_t *daddr;
1207 int family;
1208 int err;
6f26b61e
JHS		 1209 u32 mark;
1210 struct xfrm_mark m;
1da177e4 1211
7b67c857 1212 p = nlmsg_data(nlh);
776e9dd9 1213 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1da177e4
LT		 1214 if (err)
1215 goto out_noput;
1216
1217 family = p->info.family;
1218 daddr = &p->info.id.daddr;
1219
1220 x = NULL;
6f26b61e
JHS		 1221
1222 mark = xfrm_mark_get(attrs, &m);
1da177e4 1223 if (p->info.seq) {
6f26b61e 1224 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
70e94e66 1225 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1da177e4
LT		 1226 xfrm_state_put(x);
1227 x = NULL;
1228 }
1229 }
1230
1231 if (!x)
6f26b61e 1232 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1233 p->info.id.proto, daddr,
1234 &p->info.saddr, 1,
1235 family);
1236 err = -ENOENT;
1237 if (x == NULL)
1238 goto out_noput;
1239
658b219e
HX		 1240 err = xfrm_alloc_spi(x, p->min, p->max);
1241 if (err)
1242 goto out;
1da177e4 1243
658b219e 1244 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1245 if (IS_ERR(resp_skb)) {
1246 err = PTR_ERR(resp_skb);
1247 goto out;
1248 }
1249
15e47304 1250 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1251
1252out:
1253 xfrm_state_put(x);
1254out_noput:
1255 return err;
1256}
1257
b798a9ed 1258static int verify_policy_dir(u8 dir)
1da177e4
LT		 1259{
1260 switch (dir) {
1261 case XFRM_POLICY_IN:
1262 case XFRM_POLICY_OUT:
1263 case XFRM_POLICY_FWD:
1264 break;
1265
1266 default:
1267 return -EINVAL;
3ff50b79 1268 }
1da177e4
LT		 1269
1270 return 0;
1271}
1272
b798a9ed 1273static int verify_policy_type(u8 type)
f7b6983f
MN		 1274{
1275 switch (type) {
1276 case XFRM_POLICY_TYPE_MAIN:
1277#ifdef CONFIG_XFRM_SUB_POLICY
1278 case XFRM_POLICY_TYPE_SUB:
1279#endif
1280 break;
1281
1282 default:
1283 return -EINVAL;
3ff50b79 1284 }
f7b6983f
MN		 1285
1286 return 0;
1287}
1288
1da177e4
LT		 1289static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1290{
e682adf0
FD		 1291 int ret;
1292
1da177e4
LT		 1293 switch (p->share) {
1294 case XFRM_SHARE_ANY:
1295 case XFRM_SHARE_SESSION:
1296 case XFRM_SHARE_USER:
1297 case XFRM_SHARE_UNIQUE:
1298 break;
1299
1300 default:
1301 return -EINVAL;
3ff50b79 1302 }
1da177e4
LT		 1303
1304 switch (p->action) {
1305 case XFRM_POLICY_ALLOW:
1306 case XFRM_POLICY_BLOCK:
1307 break;
1308
1309 default:
1310 return -EINVAL;
3ff50b79 1311 }
1da177e4
LT		 1312
1313 switch (p->sel.family) {
1314 case AF_INET:
1315 break;
1316
1317 case AF_INET6:
dfd56b8b 1318#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1319 break;
1320#else
1321 return -EAFNOSUPPORT;
1322#endif
1323
1324 default:
1325 return -EINVAL;
3ff50b79 1326 }
1da177e4 1327
e682adf0
FD		 1328 ret = verify_policy_dir(p->dir);
1329 if (ret)
1330 return ret;
1331 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1332 return -EINVAL;
1333
1334 return 0;
1da177e4
LT		 1335}
1336
5424f32e 1337static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1338{
5424f32e 1339 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1340 struct xfrm_user_sec_ctx *uctx;
1341
1342 if (!rt)
1343 return 0;
1344
5424f32e 1345 uctx = nla_data(rt);
52a4c640 1346 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
df71837d
TJ		 1347}
1348
1da177e4
LT		 1349static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1350 int nr)
1351{
1352 int i;
1353
1354 xp->xfrm_nr = nr;
1355 for (i = 0; i < nr; i++, ut++) {
1356 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1357
1358 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1359 memcpy(&t->saddr, &ut->saddr,
1360 sizeof(xfrm_address_t));
1361 t->reqid = ut->reqid;
1362 t->mode = ut->mode;
1363 t->share = ut->share;
1364 t->optional = ut->optional;
1365 t->aalgos = ut->aalgos;
1366 t->ealgos = ut->ealgos;
1367 t->calgos = ut->calgos;
c5d18e98
HX		 1368 /* If all masks are ~0, then we allow all algorithms. */
1369 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1370 t->encap_family = ut->family;
1da177e4
LT		 1371 }
1372}
1373
b4ad86bf
DM		 1374static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1375{
1376 int i;
1377
1378 if (nr > XFRM_MAX_DEPTH)
1379 return -EINVAL;
1380
1381 for (i = 0; i < nr; i++) {
1382 /* We never validated the ut->family value, so many
1383 * applications simply leave it at zero. The check was
1384 * never made and ut->family was ignored because all
1385 * templates could be assumed to have the same family as
1386 * the policy itself. Now that we will have ipv4-in-ipv6
1387 * and ipv6-in-ipv4 tunnels, this is no longer true.
1388 */
1389 if (!ut[i].family)
1390 ut[i].family = family;
1391
1392 switch (ut[i].family) {
1393 case AF_INET:
1394 break;
dfd56b8b 1395#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1396 case AF_INET6:
1397 break;
1398#endif
1399 default:
1400 return -EINVAL;
3ff50b79 1401 }
b4ad86bf
DM		 1402 }
1403
1404 return 0;
1405}
1406
5424f32e 1407static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1408{
5424f32e 1409 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1410
1411 if (!rt) {
1412 pol->xfrm_nr = 0;
1413 } else {
5424f32e
TG		 1414 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1415 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1416 int err;
1da177e4 1417
b4ad86bf
DM		 1418 err = validate_tmpl(nr, utmpl, pol->family);
1419 if (err)
1420 return err;
1da177e4 1421
5424f32e 1422 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1423 }
1424 return 0;
1425}
1426
5424f32e 1427static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1428{
5424f32e 1429 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1430 struct xfrm_userpolicy_type *upt;
b798a9ed 1431 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1432 int err;
1433
1434 if (rt) {
5424f32e 1435 upt = nla_data(rt);
f7b6983f
MN		 1436 type = upt->type;
1437 }
1438
1439 err = verify_policy_type(type);
1440 if (err)
1441 return err;
1442
1443 *tp = type;
1444 return 0;
1445}
1446
1da177e4
LT		 1447static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1448{
1449 xp->priority = p->priority;
1450 xp->index = p->index;
1451 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1452 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1453 xp->action = p->action;
1454 xp->flags = p->flags;
1455 xp->family = p->sel.family;
1456 /* XXX xp->share = p->share; */
1457}
1458
1459static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1460{
7b789836 1461 memset(p, 0, sizeof(*p));
1da177e4
LT		 1462 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1463 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1464 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1465 p->priority = xp->priority;
1466 p->index = xp->index;
1467 p->sel.family = xp->family;
1468 p->dir = dir;
1469 p->action = xp->action;
1470 p->flags = xp->flags;
1471 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1472}
1473
fc34acd3 1474static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1475{
fc34acd3 1476 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1477 int err;
1478
1479 if (!xp) {
1480 *errp = -ENOMEM;
1481 return NULL;
1482 }
1483
1484 copy_from_user_policy(xp, p);
df71837d 1485
35a7aa08 1486 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1487 if (err)
1488 goto error;
1489
35a7aa08
TG		 1490 if (!(err = copy_from_user_tmpl(xp, attrs)))
1491 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1492 if (err)
1493 goto error;
1da177e4 1494
295fae56
JHS		 1495 xfrm_mark_get(attrs, &xp->mark);
1496
1da177e4 1497 return xp;
f7b6983f
MN		 1498 error:
1499 *errp = err;
12a169e7 1500 xp->walk.dead = 1;
64c31b3f 1501 xfrm_policy_destroy(xp);
f7b6983f 1502 return NULL;
1da177e4
LT		 1503}
1504
22e70050 1505static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1506 struct nlattr **attrs)
1da177e4 1507{
fc34acd3 1508 struct net *net = sock_net(skb->sk);
7b67c857 1509 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1510 struct xfrm_policy *xp;
26b15dad 1511 struct km_event c;
1da177e4
LT		 1512 int err;
1513 int excl;
1514
1515 err = verify_newpolicy_info(p);
df71837d
TJ		 1516 if (err)
1517 return err;
35a7aa08 1518 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1519 if (err)
1520 return err;
1521
fc34acd3 1522 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1523 if (!xp)
1524 return err;
1525
25985edc 1526 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1527 * Aha! this is anti-netlink really i.e more pfkey derived
1528 * in netlink excl is a flag and you wouldnt need
1529 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1530 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1531 err = xfrm_policy_insert(p->dir, xp, excl);
2e71029e 1532 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
161a09e7 1533
1da177e4 1534 if (err) {
03e1ad7b 1535 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1536 kfree(xp);
1537 return err;
1538 }
1539
f60f6b8f 1540 c.event = nlh->nlmsg_type;
26b15dad 1541 c.seq = nlh->nlmsg_seq;
15e47304 1542 c.portid = nlh->nlmsg_pid;
26b15dad
JHS		 1543 km_policy_notify(xp, p->dir, &c);
1544
1da177e4
LT		 1545 xfrm_pol_put(xp);
1546
1547 return 0;
1548}
1549
1550static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1551{
1552 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1553 int i;
1554
1555 if (xp->xfrm_nr == 0)
1556 return 0;
1557
1558 for (i = 0; i < xp->xfrm_nr; i++) {
1559 struct xfrm_user_tmpl *up = &vec[i];
1560 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1561
1f86840f 1562 memset(up, 0, sizeof(*up));
1da177e4 1563 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1564 up->family = kp->encap_family;
1da177e4
LT		 1565 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1566 up->reqid = kp->reqid;
1567 up->mode = kp->mode;
1568 up->share = kp->share;
1569 up->optional = kp->optional;
1570 up->aalgos = kp->aalgos;
1571 up->ealgos = kp->ealgos;
1572 up->calgos = kp->calgos;
1573 }
df71837d 1574
c0144bea
TG		 1575 return nla_put(skb, XFRMA_TMPL,
1576 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1577}
1578
1579static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1580{
1581 if (x->security) {
1582 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1583 }
1584 return 0;
0d681623 1585}
df71837d 1586
0d681623
SH		 1587static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1588{
1d1e34dd 1589 if (xp->security)
0d681623 1590 return copy_sec_ctx(xp->security, skb);
0d681623 1591 return 0;
df71837d 1592}
cfbfd45a
TG		 1593static inline size_t userpolicy_type_attrsize(void)
1594{
1595#ifdef CONFIG_XFRM_SUB_POLICY
1596 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1597#else
1598 return 0;
1599#endif
1600}
df71837d 1601
f7b6983f 1602#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1603static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1604{
c0144bea
TG		 1605 struct xfrm_userpolicy_type upt = {
1606 .type = type,
1607 };
f7b6983f 1608
c0144bea 1609 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1610}
1611
1612#else
b798a9ed 1613static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1614{
1615 return 0;
1616}
1617#endif
1618
1da177e4
LT		 1619static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1620{
1621 struct xfrm_dump_info *sp = ptr;
1622 struct xfrm_userpolicy_info *p;
1623 struct sk_buff *in_skb = sp->in_skb;
1624 struct sk_buff *skb = sp->out_skb;
1625 struct nlmsghdr *nlh;
1d1e34dd 1626 int err;
1da177e4 1627
15e47304 1628 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
79b8b7f4
TG		 1629 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1630 if (nlh == NULL)
1631 return -EMSGSIZE;
1da177e4 1632
7b67c857 1633 p = nlmsg_data(nlh);
1da177e4 1634 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1635 err = copy_to_user_tmpl(xp, skb);
1636 if (!err)
1637 err = copy_to_user_sec_ctx(xp, skb);
1638 if (!err)
1639 err = copy_to_user_policy_type(xp->type, skb);
1640 if (!err)
1641 err = xfrm_mark_put(skb, &xp->mark);
1642 if (err) {
1643 nlmsg_cancel(skb, nlh);
1644 return err;
1645 }
9825069d 1646 nlmsg_end(skb, nlh);
1da177e4 1647 return 0;
1da177e4
LT		 1648}
1649
4c563f76
TT		 1650static int xfrm_dump_policy_done(struct netlink_callback *cb)
1651{
1652 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
283bc9f3 1653 struct net *net = sock_net(cb->skb->sk);
4c563f76 1654
283bc9f3 1655 xfrm_policy_walk_done(walk, net);
4c563f76
TT		 1656 return 0;
1657}
1658
1da177e4
LT		 1659static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1660{
fc34acd3 1661 struct net *net = sock_net(skb->sk);
4c563f76 1662 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1663 struct xfrm_dump_info info;
1664
4c563f76
TT		 1665 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1666 sizeof(cb->args) - sizeof(cb->args[0]));
1667
1da177e4
LT		 1668 info.in_skb = cb->skb;
1669 info.out_skb = skb;
1670 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1671 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1672
1673 if (!cb->args[0]) {
1674 cb->args[0] = 1;
1675 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1676 }
1677
fc34acd3 1678 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1679
1680 return skb->len;
1681}
1682
1683static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1684 struct xfrm_policy *xp,
1685 int dir, u32 seq)
1686{
1687 struct xfrm_dump_info info;
1688 struct sk_buff *skb;
c2546372 1689 int err;
1da177e4 1690
7deb2264 1691 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1692 if (!skb)
1693 return ERR_PTR(-ENOMEM);
1694
1da177e4
LT		 1695 info.in_skb = in_skb;
1696 info.out_skb = skb;
1697 info.nlmsg_seq = seq;
1698 info.nlmsg_flags = 0;
1da177e4 1699
c2546372
MK		 1700 err = dump_one_policy(xp, dir, 0, &info);
1701 if (err) {
1da177e4 1702 kfree_skb(skb);
c2546372 1703 return ERR_PTR(err);
1da177e4
LT		 1704 }
1705
1706 return skb;
1707}
1708
22e70050 1709static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1710 struct nlattr **attrs)
1da177e4 1711{
fc34acd3 1712 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1713 struct xfrm_policy *xp;
1714 struct xfrm_userpolicy_id *p;
b798a9ed 1715 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1716 int err;
26b15dad 1717 struct km_event c;
1da177e4 1718 int delete;
295fae56
JHS		 1719 struct xfrm_mark m;
1720 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1721
7b67c857 1722 p = nlmsg_data(nlh);
1da177e4
LT		 1723 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1724
35a7aa08 1725 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1726 if (err)
1727 return err;
1728
1da177e4
LT		 1729 err = verify_policy_dir(p->dir);
1730 if (err)
1731 return err;
1732
1733 if (p->index)
295fae56 1734 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1735 else {
5424f32e 1736 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1737 struct xfrm_sec_ctx *ctx;
df71837d 1738
35a7aa08 1739 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1740 if (err)
1741 return err;
1742
2c8dd116 1743 ctx = NULL;
df71837d 1744 if (rt) {
5424f32e 1745 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1746
52a4c640 1747 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 1748 if (err)
df71837d 1749 return err;
2c8dd116 1750 }
295fae56 1751 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1752 ctx, delete, &err);
03e1ad7b 1753 security_xfrm_policy_free(ctx);
df71837d 1754 }
1da177e4
LT		 1755 if (xp == NULL)
1756 return -ENOENT;
1757
1758 if (!delete) {
1759 struct sk_buff *resp_skb;
1760
1761 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1762 if (IS_ERR(resp_skb)) {
1763 err = PTR_ERR(resp_skb);
1764 } else {
a6483b79 1765 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
15e47304 1766 NETLINK_CB(skb).portid);
1da177e4 1767 }
26b15dad 1768 } else {
2e71029e 1769 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
13fcfbb0
DM		 1770
1771 if (err != 0)
c8c05a8e 1772 goto out;
13fcfbb0 1773
e7443892 1774 c.data.byid = p->index;
f60f6b8f 1775 c.event = nlh->nlmsg_type;
26b15dad 1776 c.seq = nlh->nlmsg_seq;
15e47304 1777 c.portid = nlh->nlmsg_pid;
26b15dad 1778 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1779 }
1780
c8c05a8e 1781out:
ef41aaa0 1782 xfrm_pol_put(xp);
e4c17216
PM		 1783 if (delete && err == 0)
1784 xfrm_garbage_collect(net);
1da177e4
LT		 1785 return err;
1786}
1787
22e70050 1788static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1789 struct nlattr **attrs)
1da177e4 1790{
fc34acd3 1791 struct net *net = sock_net(skb->sk);
26b15dad 1792 struct km_event c;
7b67c857 1793 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
4aa2e62c 1794 int err;
1da177e4 1795
2e71029e 1796 err = xfrm_state_flush(net, p->proto, true);
9e64cc95
JHS		 1797 if (err) {
1798 if (err == -ESRCH) /* empty table */
1799 return 0;
069c474e 1800 return err;
9e64cc95 1801 }
bf08867f 1802 c.data.proto = p->proto;
f60f6b8f 1803 c.event = nlh->nlmsg_type;
26b15dad 1804 c.seq = nlh->nlmsg_seq;
15e47304 1805 c.portid = nlh->nlmsg_pid;
7067802e 1806 c.net = net;
26b15dad
JHS		 1807 km_state_notify(NULL, &c);
1808
1da177e4
LT		 1809 return 0;
1810}
1811
d8647b79 1812static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1813{
d8647b79
SK		 1814 size_t replay_size = x->replay_esn ?
1815 xfrm_replay_state_esn_len(x->replay_esn) :
1816 sizeof(struct xfrm_replay_state);
1817
7deb2264 1818 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1819 + nla_total_size(replay_size)
de95c4a4 1820 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1821 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1822 + nla_total_size(4) /* XFRM_AE_RTHR */
1823 + nla_total_size(4); /* XFRM_AE_ETHR */
1824}
d51d081d 1825
214e005b 1826static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1827{
1828 struct xfrm_aevent_id *id;
1829 struct nlmsghdr *nlh;
1d1e34dd 1830 int err;
d51d081d 1831
15e47304 1832 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
79b8b7f4
TG		 1833 if (nlh == NULL)
1834 return -EMSGSIZE;
d51d081d 1835
7b67c857 1836 id = nlmsg_data(nlh);
9b7a787d 1837 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
d51d081d
JHS		 1838 id->sa_id.spi = x->id.spi;
1839 id->sa_id.family = x->props.family;
1840 id->sa_id.proto = x->id.proto;
9b7a787d 1841 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2b5f6dcc 1842 id->reqid = x->props.reqid;
d51d081d
JHS		 1843 id->flags = c->data.aevent;
1844
d0fde795 1845 if (x->replay_esn) {
1d1e34dd
DM		 1846 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1847 xfrm_replay_state_esn_len(x->replay_esn),
1848 x->replay_esn);
d0fde795 1849 } else {
1d1e34dd
DM		 1850 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1851 &x->replay);
d0fde795 1852 }
1d1e34dd
DM		 1853 if (err)
1854 goto out_cancel;
de95c4a4
ND		 1855 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1856 XFRMA_PAD);
1d1e34dd
DM		 1857 if (err)
1858 goto out_cancel;
d51d081d 1859
1d1e34dd
DM		 1860 if (id->flags & XFRM_AE_RTHR) {
1861 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1862 if (err)
1863 goto out_cancel;
1864 }
1865 if (id->flags & XFRM_AE_ETHR) {
1866 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1867 x->replay_maxage * 10 / HZ);
1868 if (err)
1869 goto out_cancel;
1870 }
1871 err = xfrm_mark_put(skb, &x->mark);
1872 if (err)
1873 goto out_cancel;
6f26b61e 1874
053c095a
JB		 1875 nlmsg_end(skb, nlh);
1876 return 0;
d51d081d 1877
1d1e34dd 1878out_cancel:
9825069d 1879 nlmsg_cancel(skb, nlh);
1d1e34dd 1880 return err;
d51d081d
JHS		 1881}
1882
22e70050 1883static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1884 struct nlattr **attrs)
d51d081d 1885{
fc34acd3 1886 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1887 struct xfrm_state *x;
1888 struct sk_buff *r_skb;
1889 int err;
1890 struct km_event c;
6f26b61e
JHS		 1891 u32 mark;
1892 struct xfrm_mark m;
7b67c857 1893 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1894 struct xfrm_usersa_id *id = &p->sa_id;
1895
6f26b61e
JHS		 1896 mark = xfrm_mark_get(attrs, &m);
1897
1898 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1899 if (x == NULL)
d51d081d 1900 return -ESRCH;
d8647b79
SK		 1901
1902 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1903 if (r_skb == NULL) {
1904 xfrm_state_put(x);
1905 return -ENOMEM;
d51d081d
JHS		 1906 }
1907
1908 /*
1909 * XXX: is this lock really needed - none of the other
1910 * gets lock (the concern is things getting updated
1911 * while we are still reading) - jhs
1912 */
1913 spin_lock_bh(&x->lock);
1914 c.data.aevent = p->flags;
1915 c.seq = nlh->nlmsg_seq;
15e47304 1916 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1917
1918 if (build_aevent(r_skb, x, &c) < 0)
1919 BUG();
15e47304 1920 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
d51d081d
JHS		 1921 spin_unlock_bh(&x->lock);
1922 xfrm_state_put(x);
1923 return err;
1924}
1925
22e70050 1926static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1927 struct nlattr **attrs)
d51d081d 1928{
fc34acd3 1929 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1930 struct xfrm_state *x;
1931 struct km_event c;
02d0892f 1932 int err = -EINVAL;
6f26b61e
JHS		 1933 u32 mark = 0;
1934 struct xfrm_mark m;
7b67c857 1935 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1936 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1937 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1938 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
4e077237
MR		 1939 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1940 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 1941
4e077237 1942 if (!lt && !rp && !re && !et && !rt)
d51d081d
JHS		 1943 return err;
1944
1945 /* pedantic mode - thou shalt sayeth replaceth */
1946 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1947 return err;
1948
6f26b61e
JHS		 1949 mark = xfrm_mark_get(attrs, &m);
1950
1951 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1952 if (x == NULL)
1953 return -ESRCH;
1954
1955 if (x->km.state != XFRM_STATE_VALID)
1956 goto out;
1957
4479ff76 1958 err = xfrm_replay_verify_len(x->replay_esn, re);
e2b19125
SK		 1959 if (err)
1960 goto out;
1961
d51d081d 1962 spin_lock_bh(&x->lock);
e3ac104d 1963 xfrm_update_ae_params(x, attrs, 1);
d51d081d 1964 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1965
1966 c.event = nlh->nlmsg_type;
1967 c.seq = nlh->nlmsg_seq;
15e47304 1968 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1969 c.data.aevent = XFRM_AE_CU;
1970 km_state_notify(x, &c);
1971 err = 0;
1972out:
1973 xfrm_state_put(x);
1974 return err;
1975}
1976
22e70050 1977static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1978 struct nlattr **attrs)
1da177e4 1979{
fc34acd3 1980 struct net *net = sock_net(skb->sk);
f7b6983f 1981 struct km_event c;
b798a9ed 1982 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1983 int err;
1984
35a7aa08 1985 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1986 if (err)
1987 return err;
26b15dad 1988
2e71029e 1989 err = xfrm_policy_flush(net, type, true);
2f1eb65f
JHS		 1990 if (err) {
1991 if (err == -ESRCH) /* empty table */
1992 return 0;
069c474e 1993 return err;
2f1eb65f
JHS		 1994 }
1995
f7b6983f 1996 c.data.type = type;
f60f6b8f 1997 c.event = nlh->nlmsg_type;
26b15dad 1998 c.seq = nlh->nlmsg_seq;
15e47304 1999 c.portid = nlh->nlmsg_pid;
7067802e 2000 c.net = net;
26b15dad 2001 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 2002 return 0;
2003}
2004
22e70050 2005static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2006 struct nlattr **attrs)
6c5c8ca7 2007{
fc34acd3 2008 struct net *net = sock_net(skb->sk);
6c5c8ca7 2009 struct xfrm_policy *xp;
7b67c857 2010 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 2011 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 2012 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 2013 int err = -ENOENT;
295fae56
JHS		 2014 struct xfrm_mark m;
2015 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 2016
35a7aa08 2017 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 2018 if (err)
2019 return err;
2020
c8bf4d04
TT		 2021 err = verify_policy_dir(p->dir);
2022 if (err)
2023 return err;
2024
6c5c8ca7 2025 if (p->index)
295fae56 2026 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 2027 else {
5424f32e 2028 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 2029 struct xfrm_sec_ctx *ctx;
6c5c8ca7 2030
35a7aa08 2031 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 2032 if (err)
2033 return err;
2034
2c8dd116 2035 ctx = NULL;
6c5c8ca7 2036 if (rt) {
5424f32e 2037 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 2038
52a4c640 2039 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 2040 if (err)
6c5c8ca7 2041 return err;
2c8dd116 2042 }
295fae56 2043 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 2044 &p->sel, ctx, 0, &err);
03e1ad7b 2045 security_xfrm_policy_free(ctx);
6c5c8ca7 2046 }
6c5c8ca7 2047 if (xp == NULL)
ef41aaa0 2048 return -ENOENT;
03e1ad7b 2049
ea2dea9d 2050 if (unlikely(xp->walk.dead))
6c5c8ca7 2051 goto out;
6c5c8ca7 2052
6c5c8ca7
JHS		 2053 err = 0;
2054 if (up->hard) {
2055 xfrm_policy_delete(xp, p->dir);
2e71029e 2056 xfrm_audit_policy_delete(xp, 1, true);
6c5c8ca7 2057 }
c6bb8136 2058 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
6c5c8ca7
JHS		 2059
2060out:
2061 xfrm_pol_put(xp);
2062 return err;
2063}
2064
22e70050 2065static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2066 struct nlattr **attrs)
53bc6b4d 2067{
fc34acd3 2068 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 2069 struct xfrm_state *x;
2070 int err;
7b67c857 2071 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 2072 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 2073 struct xfrm_mark m;
928497f0 2074 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 2075
6f26b61e 2076 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 2077
3a765aa5 2078 err = -ENOENT;
53bc6b4d
JHS		 2079 if (x == NULL)
2080 return err;
2081
53bc6b4d 2082 spin_lock_bh(&x->lock);
3a765aa5 2083 err = -EINVAL;
53bc6b4d
JHS		 2084 if (x->km.state != XFRM_STATE_VALID)
2085 goto out;
c6bb8136 2086 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
53bc6b4d 2087
161a09e7 2088 if (ue->hard) {
53bc6b4d 2089 __xfrm_state_delete(x);
2e71029e 2090 xfrm_audit_state_delete(x, 1, true);
161a09e7 2091 }
3a765aa5 2092 err = 0;
53bc6b4d
JHS		 2093out:
2094 spin_unlock_bh(&x->lock);
2095 xfrm_state_put(x);
2096 return err;
2097}
2098
22e70050 2099static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2100 struct nlattr **attrs)
980ebd25 2101{
fc34acd3 2102 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 2103 struct xfrm_policy *xp;
2104 struct xfrm_user_tmpl *ut;
2105 int i;
5424f32e 2106 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 2107 struct xfrm_mark mark;
980ebd25 2108
7b67c857 2109 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 2110 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 2111 int err = -ENOMEM;
2112
2113 if (!x)
d8eb9307 2114 goto nomem;
980ebd25 2115
6f26b61e
JHS		 2116 xfrm_mark_get(attrs, &mark);
2117
980ebd25 2118 err = verify_newpolicy_info(&ua->policy);
d8eb9307 2119 if (err)
73efc324 2120 goto free_state;
980ebd25
JHS		 2121
2122 /* build an XP */
fc34acd3 2123 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2124 if (!xp)
2125 goto free_state;
980ebd25
JHS		 2126
2127 memcpy(&x->id, &ua->id, sizeof(ua->id));
2128 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2129 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2130 xp->mark.m = x->mark.m = mark.m;
2131 xp->mark.v = x->mark.v = mark.v;
5424f32e 2132 ut = nla_data(rt);
980ebd25
JHS		 2133 /* extract the templates and for each call km_key */
2134 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2135 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2136 memcpy(&x->id, &t->id, sizeof(x->id));
2137 x->props.mode = t->mode;
2138 x->props.reqid = t->reqid;
2139 x->props.family = ut->family;
2140 t->aalgos = ua->aalgos;
2141 t->ealgos = ua->ealgos;
2142 t->calgos = ua->calgos;
2143 err = km_query(x, t, xp);
2144
2145 }
2146
2147 kfree(x);
2148 kfree(xp);
2149
2150 return 0;
d8eb9307 2151
d8eb9307
IJ		 2152free_state:
2153 kfree(x);
2154nomem:
2155 return err;
980ebd25
JHS		 2156}
2157
5c79de6e 2158#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2159static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2160 struct xfrm_kmaddress *k,
5424f32e 2161 struct nlattr **attrs, int *num)
5c79de6e 2162{
5424f32e 2163 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2164 struct xfrm_user_migrate *um;
2165 int i, num_migrate;
2166
13c1d189
AE		 2167 if (k != NULL) {
2168 struct xfrm_user_kmaddress *uk;
2169
2170 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2171 memcpy(&k->local, &uk->local, sizeof(k->local));
2172 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2173 k->family = uk->family;
2174 k->reserved = uk->reserved;
2175 }
2176
5424f32e
TG		 2177 um = nla_data(rt);
2178 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2179
2180 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2181 return -EINVAL;
2182
2183 for (i = 0; i < num_migrate; i++, um++, ma++) {
2184 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2185 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2186 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2187 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2188
2189 ma->proto = um->proto;
2190 ma->mode = um->mode;
2191 ma->reqid = um->reqid;
2192
2193 ma->old_family = um->old_family;
2194 ma->new_family = um->new_family;
2195 }
2196
2197 *num = i;
2198 return 0;
2199}
2200
2201static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2202 struct nlattr **attrs)
5c79de6e 2203{
7b67c857 2204 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2205 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2206 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2207 u8 type;
2208 int err;
2209 int n = 0;
8d549c4f 2210 struct net *net = sock_net(skb->sk);
5c79de6e 2211
35a7aa08 2212 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2213 return -EINVAL;
5c79de6e 2214
13c1d189
AE		 2215 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2216
5424f32e 2217 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2218 if (err)
2219 return err;
2220
13c1d189 2221 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2222 if (err)
2223 return err;
2224
2225 if (!n)
2226 return 0;
2227
8d549c4f 2228 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
5c79de6e
SS		 2229
2230 return 0;
2231}
2232#else
2233static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2234 struct nlattr **attrs)
5c79de6e
SS		 2235{
2236 return -ENOPROTOOPT;
2237}
2238#endif
2239
2240#ifdef CONFIG_XFRM_MIGRATE
183cad12 2241static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2242{
2243 struct xfrm_user_migrate um;
2244
2245 memset(&um, 0, sizeof(um));
2246 um.proto = m->proto;
2247 um.mode = m->mode;
2248 um.reqid = m->reqid;
2249 um.old_family = m->old_family;
2250 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2251 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2252 um.new_family = m->new_family;
2253 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2254 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2255
c0144bea 2256 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2257}
2258
183cad12 2259static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2260{
2261 struct xfrm_user_kmaddress uk;
2262
2263 memset(&uk, 0, sizeof(uk));
2264 uk.family = k->family;
2265 uk.reserved = k->reserved;
2266 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2267 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2268
2269 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2270}
2271
2272static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2273{
2274 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2275 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2276 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2277 + userpolicy_type_attrsize();
7deb2264
TG		 2278}
2279
183cad12
DM		 2280static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2281 int num_migrate, const struct xfrm_kmaddress *k,
2282 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2283{
183cad12 2284 const struct xfrm_migrate *mp;
5c79de6e
SS		 2285 struct xfrm_userpolicy_id *pol_id;
2286 struct nlmsghdr *nlh;
1d1e34dd 2287 int i, err;
5c79de6e 2288
79b8b7f4
TG		 2289 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2290 if (nlh == NULL)
2291 return -EMSGSIZE;
5c79de6e 2292
7b67c857 2293 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2294 /* copy data from selector, dir, and type to the pol_id */
2295 memset(pol_id, 0, sizeof(*pol_id));
2296 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2297 pol_id->dir = dir;
2298
1d1e34dd
DM		 2299 if (k != NULL) {
2300 err = copy_to_user_kmaddress(k, skb);
2301 if (err)
2302 goto out_cancel;
2303 }
2304 err = copy_to_user_policy_type(type, skb);
2305 if (err)
2306 goto out_cancel;
5c79de6e 2307 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2308 err = copy_to_user_migrate(mp, skb);
2309 if (err)
2310 goto out_cancel;
5c79de6e
SS		 2311 }
2312
053c095a
JB		 2313 nlmsg_end(skb, nlh);
2314 return 0;
1d1e34dd
DM		 2315
2316out_cancel:
9825069d 2317 nlmsg_cancel(skb, nlh);
1d1e34dd 2318 return err;
5c79de6e
SS		 2319}
2320
183cad12
DM		 2321static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2322 const struct xfrm_migrate *m, int num_migrate,
2323 const struct xfrm_kmaddress *k)
5c79de6e 2324{
a6483b79 2325 struct net *net = &init_net;
5c79de6e 2326 struct sk_buff *skb;
5c79de6e 2327
13c1d189 2328 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2329 if (skb == NULL)
2330 return -ENOMEM;
2331
2332 /* build migrate */
13c1d189 2333 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2334 BUG();
2335
21ee543e 2336 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
5c79de6e
SS		 2337}
2338#else
183cad12
DM		 2339static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2340 const struct xfrm_migrate *m, int num_migrate,
2341 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2342{
2343 return -ENOPROTOOPT;
2344}
2345#endif
d51d081d 2346
a7bd9a45 2347#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2348
2349static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2350 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2351 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2352 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2353 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2354 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2355 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2356 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2357 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2358 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2359 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2360 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2361 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2362 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2363 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2364 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2365 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2366 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2367 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45 2368 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
880a6fab 2369 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
a7bd9a45 2370 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2371};
2372
492b558b
TG		 2373#undef XMSGSIZE
2374
cf5cb79f 2375static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2376 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2377 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2378 [XFRMA_LASTUSED] = { .type = NLA_U64},
2379 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2380 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2381 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2382 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2383 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2384 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2385 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2386 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2387 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2388 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2389 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2390 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2391 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2392 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2393 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2394 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2395 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2396 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2397 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2398 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
a947b0a9 2399 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
d3623099 2400 [XFRMA_PROTO] = { .type = NLA_U8 },
870a2df4 2401 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
cf5cb79f
TG		 2402};
2403
880a6fab
CG		 2404static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2405 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2406 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2407};
2408
05600a79 2409static const struct xfrm_link {
5424f32e 2410 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2411 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2412 int (*done)(struct netlink_callback *);
880a6fab
CG		 2413 const struct nla_policy *nla_pol;
2414 int nla_max;
492b558b
TG		 2415} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2416 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2417 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2418 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2419 .dump = xfrm_dump_sa,
2420 .done = xfrm_dump_sa_done },
492b558b
TG		 2421 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2422 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2423 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2424 .dump = xfrm_dump_policy,
2425 .done = xfrm_dump_policy_done },
492b558b 2426 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2427 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2428 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2429 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2430 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2431 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2432 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2433 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2434 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2435 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2436 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2437 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
880a6fab
CG		 2438 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2439 .nla_pol = xfrma_spd_policy,
2440 .nla_max = XFRMA_SPD_MAX },
ecfd6b18 2441 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2442};
2443
1d00a4eb 2444static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2445{
a6483b79 2446 struct net *net = sock_net(skb->sk);
35a7aa08 2447 struct nlattr *attrs[XFRMA_MAX+1];
05600a79 2448 const struct xfrm_link *link;
a7bd9a45 2449 int type, err;
1da177e4 2450
74005991 2451#ifdef CONFIG_COMPAT
2bf8c476 2452 if (in_compat_syscall())
83e2d058 2453 return -EOPNOTSUPP;
74005991
FD		 2454#endif
2455
1da177e4 2456 type = nlh->nlmsg_type;
1da177e4 2457 if (type > XFRM_MSG_MAX)
1d00a4eb 2458 return -EINVAL;
1da177e4
LT		 2459
2460 type -= XFRM_MSG_BASE;
2461 link = &xfrm_dispatch[type];
2462
2463 /* All operations require privileges, even GET */
90f62cf3 2464 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
1d00a4eb 2465 return -EPERM;
1da177e4 2466
492b558b
TG		 2467 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2468 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2469 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2470 if (link->dump == NULL)
1d00a4eb 2471 return -EINVAL;
88fc2c84 2472
80d326fa
PNA		 2473 {
2474 struct netlink_dump_control c = {
2475 .dump = link->dump,
2476 .done = link->done,
2477 };
2478 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2479 }
1da177e4
LT		 2480 }
2481
880a6fab
CG		 2482 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2483 link->nla_max ? : XFRMA_MAX,
2484 link->nla_pol ? : xfrma_policy);
a7bd9a45
TG		 2485 if (err < 0)
2486 return err;
1da177e4
LT		 2487
2488 if (link->doit == NULL)
1d00a4eb 2489 return -EINVAL;
1da177e4 2490
5424f32e 2491 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2492}
2493
cd40b7d3 2494static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2495{
283bc9f3
FD		 2496 struct net *net = sock_net(skb->sk);
2497
2498 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
cd40b7d3 2499 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
283bc9f3 2500 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
1da177e4
LT		 2501}
2502
7deb2264
TG		 2503static inline size_t xfrm_expire_msgsize(void)
2504{
6f26b61e
JHS		 2505 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2506 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2507}
2508
214e005b 2509static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2510{
2511 struct xfrm_user_expire *ue;
2512 struct nlmsghdr *nlh;
1d1e34dd 2513 int err;
1da177e4 2514
15e47304 2515 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
79b8b7f4
TG		 2516 if (nlh == NULL)
2517 return -EMSGSIZE;
1da177e4 2518
7b67c857 2519 ue = nlmsg_data(nlh);
1da177e4 2520 copy_to_user_state(x, &ue->state);
d51d081d 2521 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2522
1d1e34dd
DM		 2523 err = xfrm_mark_put(skb, &x->mark);
2524 if (err)
2525 return err;
6f26b61e 2526
053c095a
JB		 2527 nlmsg_end(skb, nlh);
2528 return 0;
1da177e4
LT		 2529}
2530
214e005b 2531static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2532{
fc34acd3 2533 struct net *net = xs_net(x);
1da177e4
LT		 2534 struct sk_buff *skb;
2535
7deb2264 2536 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2537 if (skb == NULL)
2538 return -ENOMEM;
2539
6f26b61e
JHS		 2540 if (build_expire(skb, x, c) < 0) {
2541 kfree_skb(skb);
2542 return -EMSGSIZE;
2543 }
1da177e4 2544
21ee543e 2545 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
1da177e4
LT		 2546}
2547
214e005b 2548static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2549{
fc34acd3 2550 struct net *net = xs_net(x);
d51d081d 2551 struct sk_buff *skb;
d51d081d 2552
d8647b79 2553 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2554 if (skb == NULL)
2555 return -ENOMEM;
2556
2557 if (build_aevent(skb, x, c) < 0)
2558 BUG();
2559
21ee543e 2560 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
d51d081d
JHS		 2561}
2562
214e005b 2563static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2564{
7067802e 2565 struct net *net = c->net;
26b15dad
JHS		 2566 struct xfrm_usersa_flush *p;
2567 struct nlmsghdr *nlh;
2568 struct sk_buff *skb;
7deb2264 2569 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2570
7deb2264 2571 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2572 if (skb == NULL)
2573 return -ENOMEM;
26b15dad 2574
15e47304 2575 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
79b8b7f4
TG		 2576 if (nlh == NULL) {
2577 kfree_skb(skb);
2578 return -EMSGSIZE;
2579 }
26b15dad 2580
7b67c857 2581 p = nlmsg_data(nlh);
bf08867f 2582 p->proto = c->data.proto;
26b15dad 2583
9825069d 2584 nlmsg_end(skb, nlh);
26b15dad 2585
21ee543e 2586 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
26b15dad
JHS		 2587}
2588
7deb2264 2589static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2590{
7deb2264 2591 size_t l = 0;
1a6509d9
HX		 2592 if (x->aead)
2593 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2594 if (x->aalg) {
2595 l += nla_total_size(sizeof(struct xfrm_algo) +
2596 (x->aalg->alg_key_len + 7) / 8);
2597 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2598 }
26b15dad 2599 if (x->ealg)
0f99be0d 2600 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2601 if (x->calg)
7deb2264 2602 l += nla_total_size(sizeof(*x->calg));
26b15dad 2603 if (x->encap)
7deb2264 2604 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2605 if (x->tfcpad)
2606 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2607 if (x->replay_esn)
2608 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
f293a5e3 2609 else
2610 l += nla_total_size(sizeof(struct xfrm_replay_state));
68325d3b
HX		 2611 if (x->security)
2612 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2613 x->security->ctx_len);
2614 if (x->coaddr)
2615 l += nla_total_size(sizeof(*x->coaddr));
a947b0a9
ND		 2616 if (x->props.extra_flags)
2617 l += nla_total_size(sizeof(x->props.extra_flags));
68325d3b 2618
d26f3984 2619 /* Must count x->lastused as it may become non-zero behind our back. */
de95c4a4 2620 l += nla_total_size_64bit(sizeof(u64));
26b15dad
JHS		 2621
2622 return l;
2623}
2624
214e005b 2625static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2626{
fc34acd3 2627 struct net *net = xs_net(x);
26b15dad 2628 struct xfrm_usersa_info *p;
0603eac0 2629 struct xfrm_usersa_id *id;
26b15dad
JHS		 2630 struct nlmsghdr *nlh;
2631 struct sk_buff *skb;
26b15dad 2632 int len = xfrm_sa_len(x);
1d1e34dd 2633 int headlen, err;
0603eac0
HX		 2634
2635 headlen = sizeof(*p);
2636 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2637 len += nla_total_size(headlen);
0603eac0 2638 headlen = sizeof(*id);
6f26b61e 2639 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2640 }
7deb2264 2641 len += NLMSG_ALIGN(headlen);
26b15dad 2642
7deb2264 2643 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2644 if (skb == NULL)
2645 return -ENOMEM;
26b15dad 2646
15e47304 2647 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2648 err = -EMSGSIZE;
79b8b7f4 2649 if (nlh == NULL)
1d1e34dd 2650 goto out_free_skb;
26b15dad 2651
7b67c857 2652 p = nlmsg_data(nlh);
0603eac0 2653 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2654 struct nlattr *attr;
2655
7b67c857 2656 id = nlmsg_data(nlh);
0603eac0
HX		 2657 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2658 id->spi = x->id.spi;
2659 id->family = x->props.family;
2660 id->proto = x->id.proto;
2661
c0144bea 2662 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2663 err = -EMSGSIZE;
c0144bea 2664 if (attr == NULL)
1d1e34dd 2665 goto out_free_skb;
c0144bea
TG		 2666
2667 p = nla_data(attr);
0603eac0 2668 }
1d1e34dd
DM		 2669 err = copy_to_user_state_extra(x, p, skb);
2670 if (err)
2671 goto out_free_skb;
26b15dad 2672
9825069d 2673 nlmsg_end(skb, nlh);
26b15dad 2674
21ee543e 2675 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
26b15dad 2676
1d1e34dd 2677out_free_skb:
26b15dad 2678 kfree_skb(skb);
1d1e34dd 2679 return err;
26b15dad
JHS		 2680}
2681
214e005b 2682static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2683{
2684
2685 switch (c->event) {
f60f6b8f 2686 case XFRM_MSG_EXPIRE:
26b15dad 2687 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2688 case XFRM_MSG_NEWAE:
2689 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2690 case XFRM_MSG_DELSA:
2691 case XFRM_MSG_UPDSA:
2692 case XFRM_MSG_NEWSA:
26b15dad 2693 return xfrm_notify_sa(x, c);
f60f6b8f 2694 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2695 return xfrm_notify_sa_flush(c);
2696 default:
62db5cfd 2697 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2698 c->event);
2699 break;
26b15dad
JHS		 2700 }
2701
2702 return 0;
2703
2704}
2705
7deb2264
TG		 2706static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2707 struct xfrm_policy *xp)
2708{
2709 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2710 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2711 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2712 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2713 + userpolicy_type_attrsize();
2714}
2715
1da177e4 2716static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
65e0736b 2717 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
1da177e4 2718{
1d1e34dd 2719 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2720 struct xfrm_user_acquire *ua;
2721 struct nlmsghdr *nlh;
1d1e34dd 2722 int err;
1da177e4 2723
79b8b7f4
TG		 2724 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2725 if (nlh == NULL)
2726 return -EMSGSIZE;
1da177e4 2727
7b67c857 2728 ua = nlmsg_data(nlh);
1da177e4
LT		 2729 memcpy(&ua->id, &x->id, sizeof(ua->id));
2730 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2731 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
65e0736b 2732 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
1da177e4
LT		 2733 ua->aalgos = xt->aalgos;
2734 ua->ealgos = xt->ealgos;
2735 ua->calgos = xt->calgos;
2736 ua->seq = x->km.seq = seq;
2737
1d1e34dd
DM		 2738 err = copy_to_user_tmpl(xp, skb);
2739 if (!err)
2740 err = copy_to_user_state_sec_ctx(x, skb);
2741 if (!err)
2742 err = copy_to_user_policy_type(xp->type, skb);
2743 if (!err)
2744 err = xfrm_mark_put(skb, &xp->mark);
2745 if (err) {
2746 nlmsg_cancel(skb, nlh);
2747 return err;
2748 }
1da177e4 2749
053c095a
JB		 2750 nlmsg_end(skb, nlh);
2751 return 0;
1da177e4
LT		 2752}
2753
2754static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
65e0736b 2755 struct xfrm_policy *xp)
1da177e4 2756{
a6483b79 2757 struct net *net = xs_net(x);
1da177e4 2758 struct sk_buff *skb;
1da177e4 2759
7deb2264 2760 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2761 if (skb == NULL)
2762 return -ENOMEM;
2763
65e0736b 2764 if (build_acquire(skb, x, xt, xp) < 0)
1da177e4
LT		 2765 BUG();
2766
21ee543e 2767 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
1da177e4
LT		 2768}
2769
2770/* User gives us xfrm_user_policy_info followed by an array of 0
2771 * or more templates.
2772 */
cb969f07 2773static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2774 u8 *data, int len, int *dir)
2775{
fc34acd3 2776 struct net *net = sock_net(sk);
1da177e4
LT		 2777 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2778 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2779 struct xfrm_policy *xp;
2780 int nr;
2781
cb969f07 2782 switch (sk->sk_family) {
1da177e4
LT		 2783 case AF_INET:
2784 if (opt != IP_XFRM_POLICY) {
2785 *dir = -EOPNOTSUPP;
2786 return NULL;
2787 }
2788 break;
dfd56b8b 2789#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2790 case AF_INET6:
2791 if (opt != IPV6_XFRM_POLICY) {
2792 *dir = -EOPNOTSUPP;
2793 return NULL;
2794 }
2795 break;
2796#endif
2797 default:
2798 *dir = -EINVAL;
2799 return NULL;
2800 }
2801
2802 *dir = -EINVAL;
2803
2804 if (len < sizeof(*p) ||
2805 verify_newpolicy_info(p))
2806 return NULL;
2807
2808 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2809 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2810 return NULL;
2811
a4f1bac6
HX		 2812 if (p->dir > XFRM_POLICY_OUT)
2813 return NULL;
2814
2f09a4d5 2815 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2816 if (xp == NULL) {
2817 *dir = -ENOBUFS;
2818 return NULL;
2819 }
2820
2821 copy_from_user_policy(xp, p);
f7b6983f 2822 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2823 copy_templates(xp, ut, nr);
2824
2825 *dir = p->dir;
2826
2827 return xp;
2828}
2829
7deb2264
TG		 2830static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2831{
2832 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2833 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2834 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2835 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2836 + userpolicy_type_attrsize();
2837}
2838
1da177e4 2839static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2840 int dir, const struct km_event *c)
1da177e4
LT		 2841{
2842 struct xfrm_user_polexpire *upe;
d51d081d 2843 int hard = c->data.hard;
1d1e34dd
DM		 2844 struct nlmsghdr *nlh;
2845 int err;
1da177e4 2846
15e47304 2847 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
79b8b7f4
TG		 2848 if (nlh == NULL)
2849 return -EMSGSIZE;
1da177e4 2850
7b67c857 2851 upe = nlmsg_data(nlh);
1da177e4 2852 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2853 err = copy_to_user_tmpl(xp, skb);
2854 if (!err)
2855 err = copy_to_user_sec_ctx(xp, skb);
2856 if (!err)
2857 err = copy_to_user_policy_type(xp->type, skb);
2858 if (!err)
2859 err = xfrm_mark_put(skb, &xp->mark);
2860 if (err) {
2861 nlmsg_cancel(skb, nlh);
2862 return err;
2863 }
1da177e4
LT		 2864 upe->hard = !!hard;
2865
053c095a
JB		 2866 nlmsg_end(skb, nlh);
2867 return 0;
1da177e4
LT		 2868}
2869
214e005b 2870static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2871{
fc34acd3 2872 struct net *net = xp_net(xp);
1da177e4 2873 struct sk_buff *skb;
1da177e4 2874
7deb2264 2875 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2876 if (skb == NULL)
2877 return -ENOMEM;
2878
d51d081d 2879 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2880 BUG();
2881
21ee543e 2882 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
1da177e4
LT		 2883}
2884
214e005b 2885static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2886{
1d1e34dd 2887 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2888 struct net *net = xp_net(xp);
26b15dad 2889 struct xfrm_userpolicy_info *p;
0603eac0 2890 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2891 struct nlmsghdr *nlh;
2892 struct sk_buff *skb;
1d1e34dd 2893 int headlen, err;
0603eac0
HX		 2894
2895 headlen = sizeof(*p);
2896 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2897 len += nla_total_size(headlen);
0603eac0
HX		 2898 headlen = sizeof(*id);
2899 }
cfbfd45a 2900 len += userpolicy_type_attrsize();
295fae56 2901 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2902 len += NLMSG_ALIGN(headlen);
26b15dad 2903
7deb2264 2904 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2905 if (skb == NULL)
2906 return -ENOMEM;
26b15dad 2907
15e47304 2908 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2909 err = -EMSGSIZE;
79b8b7f4 2910 if (nlh == NULL)
1d1e34dd 2911 goto out_free_skb;
26b15dad 2912
7b67c857 2913 p = nlmsg_data(nlh);
0603eac0 2914 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2915 struct nlattr *attr;
2916
7b67c857 2917 id = nlmsg_data(nlh);
0603eac0
HX		 2918 memset(id, 0, sizeof(*id));
2919 id->dir = dir;
2920 if (c->data.byid)
2921 id->index = xp->index;
2922 else
2923 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2924
c0144bea 2925 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2926 err = -EMSGSIZE;
c0144bea 2927 if (attr == NULL)
1d1e34dd 2928 goto out_free_skb;
c0144bea
TG		 2929
2930 p = nla_data(attr);
0603eac0 2931 }
26b15dad 2932
26b15dad 2933 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2934 err = copy_to_user_tmpl(xp, skb);
2935 if (!err)
2936 err = copy_to_user_policy_type(xp->type, skb);
2937 if (!err)
2938 err = xfrm_mark_put(skb, &xp->mark);
2939 if (err)
2940 goto out_free_skb;
295fae56 2941
9825069d 2942 nlmsg_end(skb, nlh);
26b15dad 2943
21ee543e 2944 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
26b15dad 2945
1d1e34dd 2946out_free_skb:
26b15dad 2947 kfree_skb(skb);
1d1e34dd 2948 return err;
26b15dad
JHS		 2949}
2950
214e005b 2951static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2952{
7067802e 2953 struct net *net = c->net;
26b15dad
JHS		 2954 struct nlmsghdr *nlh;
2955 struct sk_buff *skb;
1d1e34dd 2956 int err;
26b15dad 2957
7deb2264 2958 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2959 if (skb == NULL)
2960 return -ENOMEM;
26b15dad 2961
15e47304 2962 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2963 err = -EMSGSIZE;
79b8b7f4 2964 if (nlh == NULL)
1d1e34dd
DM		 2965 goto out_free_skb;
2966 err = copy_to_user_policy_type(c->data.type, skb);
2967 if (err)
2968 goto out_free_skb;
26b15dad 2969
9825069d 2970 nlmsg_end(skb, nlh);
26b15dad 2971
21ee543e 2972 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
26b15dad 2973
1d1e34dd 2974out_free_skb:
26b15dad 2975 kfree_skb(skb);
1d1e34dd 2976 return err;
26b15dad
JHS		 2977}
2978
214e005b 2979static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2980{
2981
2982 switch (c->event) {
f60f6b8f
HX		 2983 case XFRM_MSG_NEWPOLICY:
2984 case XFRM_MSG_UPDPOLICY:
2985 case XFRM_MSG_DELPOLICY:
26b15dad 2986 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2987 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2988 return xfrm_notify_policy_flush(c);
f60f6b8f 2989 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2990 return xfrm_exp_policy_notify(xp, dir, c);
2991 default:
62db5cfd 2992 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2993 c->event);
26b15dad
JHS		 2994 }
2995
2996 return 0;
2997
2998}
2999
7deb2264
TG		 3000static inline size_t xfrm_report_msgsize(void)
3001{
3002 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3003}
3004
97a64b45
MN		 3005static int build_report(struct sk_buff *skb, u8 proto,
3006 struct xfrm_selector *sel, xfrm_address_t *addr)
3007{
3008 struct xfrm_user_report *ur;
3009 struct nlmsghdr *nlh;
97a64b45 3010
79b8b7f4
TG		 3011 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3012 if (nlh == NULL)
3013 return -EMSGSIZE;
97a64b45 3014
7b67c857 3015 ur = nlmsg_data(nlh);
97a64b45
MN		 3016 ur->proto = proto;
3017 memcpy(&ur->sel, sel, sizeof(ur->sel));
3018
1d1e34dd
DM		 3019 if (addr) {
3020 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3021 if (err) {
3022 nlmsg_cancel(skb, nlh);
3023 return err;
3024 }
3025 }
053c095a
JB		 3026 nlmsg_end(skb, nlh);
3027 return 0;
97a64b45
MN		 3028}
3029
db983c11
AD		 3030static int xfrm_send_report(struct net *net, u8 proto,
3031 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 3032{
3033 struct sk_buff *skb;
97a64b45 3034
7deb2264 3035 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 3036 if (skb == NULL)
3037 return -ENOMEM;
3038
3039 if (build_report(skb, proto, sel, addr) < 0)
3040 BUG();
3041
21ee543e 3042 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
97a64b45
MN		 3043}
3044
3a2dfbe8
MW		 3045static inline size_t xfrm_mapping_msgsize(void)
3046{
3047 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3048}
3049
3050static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3051 xfrm_address_t *new_saddr, __be16 new_sport)
3052{
3053 struct xfrm_user_mapping *um;
3054 struct nlmsghdr *nlh;
3055
3056 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3057 if (nlh == NULL)
3058 return -EMSGSIZE;
3059
3060 um = nlmsg_data(nlh);
3061
3062 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3063 um->id.spi = x->id.spi;
3064 um->id.family = x->props.family;
3065 um->id.proto = x->id.proto;
3066 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3067 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3068 um->new_sport = new_sport;
3069 um->old_sport = x->encap->encap_sport;
3070 um->reqid = x->props.reqid;
3071
053c095a
JB		 3072 nlmsg_end(skb, nlh);
3073 return 0;
3a2dfbe8
MW		 3074}
3075
3076static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3077 __be16 sport)
3078{
a6483b79 3079 struct net *net = xs_net(x);
3a2dfbe8
MW		 3080 struct sk_buff *skb;
3081
3082 if (x->id.proto != IPPROTO_ESP)
3083 return -EINVAL;
3084
3085 if (!x->encap)
3086 return -EINVAL;
3087
3088 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3089 if (skb == NULL)
3090 return -ENOMEM;
3091
3092 if (build_mapping(skb, x, ipaddr, sport) < 0)
3093 BUG();
3094
21ee543e 3095 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3a2dfbe8
MW		 3096}
3097
0f24558e
HG		 3098static bool xfrm_is_alive(const struct km_event *c)
3099{
3100 return (bool)xfrm_acquire_is_on(c->net);
3101}
3102
1da177e4
LT		 3103static struct xfrm_mgr netlink_mgr = {
3104 .id = "netlink",
3105 .notify = xfrm_send_state_notify,
3106 .acquire = xfrm_send_acquire,
3107 .compile_policy = xfrm_compile_policy,
3108 .notify_policy = xfrm_send_policy_notify,
97a64b45 3109 .report = xfrm_send_report,
5c79de6e 3110 .migrate = xfrm_send_migrate,
3a2dfbe8 3111 .new_mapping = xfrm_send_mapping,
0f24558e 3112 .is_alive = xfrm_is_alive,
1da177e4
LT		 3113};
3114
a6483b79 3115static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 3116{
be33690d 3117 struct sock *nlsk;
a31f2d17
PNA		 3118 struct netlink_kernel_cfg cfg = {
3119 .groups = XFRMNLGRP_MAX,
3120 .input = xfrm_netlink_rcv,
3121 };
be33690d 3122
9f00d977 3123 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
be33690d 3124 if (nlsk == NULL)
1da177e4 3125 return -ENOMEM;
d79d792e 3126 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 3127 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 3128 return 0;
3129}
3130
d79d792e 3131static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 3132{
d79d792e
EB		 3133 struct net *net;
3134 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 3135 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 3136 synchronize_net();
3137 list_for_each_entry(net, net_exit_list, exit_list)
3138 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 3139}
3140
a6483b79 3141static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 3142 .init = xfrm_user_net_init,
3143 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 3144};
3145
3146static int __init xfrm_user_init(void)
3147{
3148 int rv;
3149
3150 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3151
3152 rv = register_pernet_subsys(&xfrm_user_net_ops);
3153 if (rv < 0)
3154 return rv;
3155 rv = xfrm_register_km(&netlink_mgr);
3156 if (rv < 0)
3157 unregister_pernet_subsys(&xfrm_user_net_ops);
3158 return rv;
3159}
3160
3161static void __exit xfrm_user_exit(void)
3162{
3163 xfrm_unregister_km(&netlink_mgr);
3164 unregister_pernet_subsys(&xfrm_user_net_ops);
3165}
3166
1da177e4
LT		 3167module_init(xfrm_user_init);
3168module_exit(xfrm_user_exit);
3169MODULE_LICENSE("GPL");
4fdb3bb7 3170MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3171
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