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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
fd21150a
TG		 584 if (attrs[XFRMA_SEC_CTX] &&
585 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 586 goto error;
587
d8647b79
SK		 588 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
589 attrs[XFRMA_REPLAY_ESN_VAL])))
590 goto error;
591
1da177e4 592 x->km.seq = p->seq;
b27aeadb 593 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 594 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 595 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 596
9fdc4883
SK		 597 if ((err = xfrm_init_replay(x)))
598 goto error;
d51d081d 599
9fdc4883 600 /* override default values from above */
e3ac104d 601 xfrm_update_ae_params(x, attrs, 0);
1da177e4
LT		 602
603 return x;
604
605error:
606 x->km.state = XFRM_STATE_DEAD;
607 xfrm_state_put(x);
608error_no_put:
609 *errp = err;
610 return NULL;
611}
612
22e70050 613static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 614 struct nlattr **attrs)
1da177e4 615{
fc34acd3 616 struct net *net = sock_net(skb->sk);
7b67c857 617 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 618 struct xfrm_state *x;
619 int err;
26b15dad 620 struct km_event c;
1da177e4 621
35a7aa08 622 err = verify_newsa_info(p, attrs);
1da177e4
LT		 623 if (err)
624 return err;
625
fc34acd3 626 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 627 if (!x)
628 return err;
629
26b15dad 630 xfrm_state_hold(x);
1da177e4
LT		 631 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
632 err = xfrm_state_add(x);
633 else
634 err = xfrm_state_update(x);
635
2e71029e 636 xfrm_audit_state_add(x, err ? 0 : 1, true);
161a09e7 637
1da177e4
LT		 638 if (err < 0) {
639 x->km.state = XFRM_STATE_DEAD;
21380b81 640 __xfrm_state_put(x);
7d6dfe1f 641 goto out;
1da177e4
LT		 642 }
643
26b15dad 644 c.seq = nlh->nlmsg_seq;
15e47304 645 c.portid = nlh->nlmsg_pid;
f60f6b8f 646 c.event = nlh->nlmsg_type;
26b15dad
JHS		 647
648 km_state_notify(x, &c);
7d6dfe1f 649out:
26b15dad 650 xfrm_state_put(x);
1da177e4
LT		 651 return err;
652}
653
fc34acd3
AD		 654static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
655 struct xfrm_usersa_id *p,
5424f32e 656 struct nlattr **attrs,
eb2971b6
MN		 657 int *errp)
658{
659 struct xfrm_state *x = NULL;
6f26b61e 660 struct xfrm_mark m;
eb2971b6 661 int err;
6f26b61e 662 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 663
664 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
665 err = -ESRCH;
6f26b61e 666 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 667 } else {
668 xfrm_address_t *saddr = NULL;
669
35a7aa08 670 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 671 if (!saddr) {
672 err = -EINVAL;
673 goto out;
674 }
675
9abbffee 676 err = -ESRCH;
6f26b61e
JHS		 677 x = xfrm_state_lookup_byaddr(net, mark,
678 &p->daddr, saddr,
221df1ed 679 p->proto, p->family);
eb2971b6
MN		 680 }
681
682 out:
683 if (!x && errp)
684 *errp = err;
685 return x;
686}
687
22e70050 688static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 689 struct nlattr **attrs)
1da177e4 690{
fc34acd3 691 struct net *net = sock_net(skb->sk);
1da177e4 692 struct xfrm_state *x;
eb2971b6 693 int err = -ESRCH;
26b15dad 694 struct km_event c;
7b67c857 695 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4 696
fc34acd3 697 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 698 if (x == NULL)
eb2971b6 699 return err;
1da177e4 700
6f68dc37 701 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 702 goto out;
703
1da177e4 704 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 705 err = -EPERM;
706 goto out;
1da177e4
LT		 707 }
708
26b15dad 709 err = xfrm_state_delete(x);
161a09e7 710
c8c05a8e
CZ		 711 if (err < 0)
712 goto out;
26b15dad
JHS		 713
714 c.seq = nlh->nlmsg_seq;
15e47304 715 c.portid = nlh->nlmsg_pid;
f60f6b8f 716 c.event = nlh->nlmsg_type;
26b15dad 717 km_state_notify(x, &c);
1da177e4 718
c8c05a8e 719out:
2e71029e 720 xfrm_audit_state_delete(x, err ? 0 : 1, true);
c8c05a8e 721 xfrm_state_put(x);
26b15dad 722 return err;
1da177e4
LT		 723}
724
725static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
726{
f778a636 727 memset(p, 0, sizeof(*p));
1da177e4
LT		 728 memcpy(&p->id, &x->id, sizeof(p->id));
729 memcpy(&p->sel, &x->sel, sizeof(p->sel));
730 memcpy(&p->lft, &x->lft, sizeof(p->lft));
731 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
e33d4f13
SV		 732 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
733 put_unaligned(x->stats.replay, &p->stats.replay);
734 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
54489c14 735 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 736 p->mode = x->props.mode;
737 p->replay_window = x->props.replay_window;
738 p->reqid = x->props.reqid;
739 p->family = x->props.family;
740 p->flags = x->props.flags;
741 p->seq = x->km.seq;
742}
743
744struct xfrm_dump_info {
745 struct sk_buff *in_skb;
746 struct sk_buff *out_skb;
747 u32 nlmsg_seq;
748 u16 nlmsg_flags;
1da177e4
LT		 749};
750
c0144bea
TG		 751static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
752{
c0144bea
TG		 753 struct xfrm_user_sec_ctx *uctx;
754 struct nlattr *attr;
68325d3b 755 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 756
757 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
758 if (attr == NULL)
759 return -EMSGSIZE;
760
761 uctx = nla_data(attr);
762 uctx->exttype = XFRMA_SEC_CTX;
763 uctx->len = ctx_size;
764 uctx->ctx_doi = s->ctx_doi;
765 uctx->ctx_alg = s->ctx_alg;
766 uctx->ctx_len = s->ctx_len;
767 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
768
769 return 0;
770}
771
4447bb33
MW		 772static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
773{
774 struct xfrm_algo *algo;
775 struct nlattr *nla;
776
777 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
778 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
779 if (!nla)
780 return -EMSGSIZE;
781
782 algo = nla_data(nla);
4c87308b 783 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 784 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
785 algo->alg_key_len = auth->alg_key_len;
786
787 return 0;
788}
789
68325d3b
HX		 790/* Don't change this without updating xfrm_sa_len! */
791static int copy_to_user_state_extra(struct xfrm_state *x,
792 struct xfrm_usersa_info *p,
793 struct sk_buff *skb)
1da177e4 794{
1d1e34dd 795 int ret = 0;
d0fde795 796
1d1e34dd 797 copy_to_user_state(x, p);
68325d3b 798
a947b0a9
ND		 799 if (x->props.extra_flags) {
800 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
801 x->props.extra_flags);
802 if (ret)
803 goto out;
804 }
805
1d1e34dd
DM		 806 if (x->coaddr) {
807 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
808 if (ret)
809 goto out;
810 }
811 if (x->lastused) {
de95c4a4
ND		 812 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
813 XFRMA_PAD);
1d1e34dd
DM		 814 if (ret)
815 goto out;
816 }
817 if (x->aead) {
818 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
819 if (ret)
820 goto out;
821 }
822 if (x->aalg) {
823 ret = copy_to_user_auth(x->aalg, skb);
824 if (!ret)
825 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
826 xfrm_alg_auth_len(x->aalg), x->aalg);
827 if (ret)
828 goto out;
829 }
830 if (x->ealg) {
831 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
832 if (ret)
833 goto out;
834 }
835 if (x->calg) {
836 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
837 if (ret)
838 goto out;
839 }
840 if (x->encap) {
841 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
842 if (ret)
843 goto out;
844 }
845 if (x->tfcpad) {
846 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
847 if (ret)
848 goto out;
849 }
850 ret = xfrm_mark_put(skb, &x->mark);
851 if (ret)
852 goto out;
f293a5e3 853 if (x->replay_esn)
1d1e34dd
DM		 854 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
855 xfrm_replay_state_esn_len(x->replay_esn),
856 x->replay_esn);
f293a5e3 857 else
858 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
859 &x->replay);
860 if (ret)
861 goto out;
1d1e34dd
DM		 862 if (x->security)
863 ret = copy_sec_ctx(x->security, skb);
864out:
865 return ret;
68325d3b
HX		 866}
867
868static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
869{
870 struct xfrm_dump_info *sp = ptr;
871 struct sk_buff *in_skb = sp->in_skb;
872 struct sk_buff *skb = sp->out_skb;
873 struct xfrm_usersa_info *p;
874 struct nlmsghdr *nlh;
875 int err;
876
15e47304 877 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
68325d3b
HX		 878 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
879 if (nlh == NULL)
880 return -EMSGSIZE;
881
882 p = nlmsg_data(nlh);
883
884 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 885 if (err) {
886 nlmsg_cancel(skb, nlh);
887 return err;
888 }
9825069d 889 nlmsg_end(skb, nlh);
1da177e4 890 return 0;
1da177e4
LT		 891}
892
4c563f76
TT		 893static int xfrm_dump_sa_done(struct netlink_callback *cb)
894{
895 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
283bc9f3
FD		 896 struct sock *sk = cb->skb->sk;
897 struct net *net = sock_net(sk);
898
899 xfrm_state_walk_done(walk, net);
4c563f76
TT		 900 return 0;
901}
902
d3623099 903static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1da177e4
LT		 904static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
905{
fc34acd3 906 struct net *net = sock_net(skb->sk);
4c563f76 907 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 908 struct xfrm_dump_info info;
909
4c563f76
TT		 910 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
911 sizeof(cb->args) - sizeof(cb->args[0]));
912
1da177e4
LT		 913 info.in_skb = cb->skb;
914 info.out_skb = skb;
915 info.nlmsg_seq = cb->nlh->nlmsg_seq;
916 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 917
918 if (!cb->args[0]) {
d3623099 919 struct nlattr *attrs[XFRMA_MAX+1];
870a2df4 920 struct xfrm_address_filter *filter = NULL;
d3623099
ND		 921 u8 proto = 0;
922 int err;
923
4c563f76 924 cb->args[0] = 1;
d3623099
ND		 925
926 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
927 xfrma_policy);
928 if (err < 0)
929 return err;
930
870a2df4 931 if (attrs[XFRMA_ADDRESS_FILTER]) {
df367561
AH		 932 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
933 sizeof(*filter), GFP_KERNEL);
d3623099
ND		 934 if (filter == NULL)
935 return -ENOMEM;
d3623099
ND		 936 }
937
938 if (attrs[XFRMA_PROTO])
939 proto = nla_get_u8(attrs[XFRMA_PROTO]);
940
941 xfrm_state_walk_init(walk, proto, filter);
4c563f76
TT		 942 }
943
fc34acd3 944 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 945
946 return skb->len;
947}
948
949static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
950 struct xfrm_state *x, u32 seq)
951{
952 struct xfrm_dump_info info;
953 struct sk_buff *skb;
864745d2 954 int err;
1da177e4 955
7deb2264 956 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 957 if (!skb)
958 return ERR_PTR(-ENOMEM);
959
1da177e4
LT		 960 info.in_skb = in_skb;
961 info.out_skb = skb;
962 info.nlmsg_seq = seq;
963 info.nlmsg_flags = 0;
1da177e4 964
864745d2
MK		 965 err = dump_one_state(x, 0, &info);
966 if (err) {
1da177e4 967 kfree_skb(skb);
864745d2 968 return ERR_PTR(err);
1da177e4
LT		 969 }
970
971 return skb;
972}
973
21ee543e
MK		 974/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
975 * Must be called with RCU read lock.
976 */
977static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
978 u32 pid, unsigned int group)
979{
980 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
981
982 if (nlsk)
983 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
984 else
985 return -1;
986}
987
7deb2264
TG		 988static inline size_t xfrm_spdinfo_msgsize(void)
989{
990 return NLMSG_ALIGN(4)
991 + nla_total_size(sizeof(struct xfrmu_spdinfo))
880a6fab
CG		 992 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
993 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
994 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
7deb2264
TG		 995}
996
e071041b 997static int build_spdinfo(struct sk_buff *skb, struct net *net,
15e47304 998 u32 portid, u32 seq, u32 flags)
ecfd6b18 999{
5a6d3416
JHS		 1000 struct xfrmk_spdinfo si;
1001 struct xfrmu_spdinfo spc;
1002 struct xfrmu_spdhinfo sph;
880a6fab 1003 struct xfrmu_spdhthresh spt4, spt6;
ecfd6b18 1004 struct nlmsghdr *nlh;
1d1e34dd 1005 int err;
ecfd6b18 1006 u32 *f;
880a6fab 1007 unsigned lseq;
ecfd6b18 1008
15e47304 1009 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 1010 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 1011 return -EMSGSIZE;
1012
1013 f = nlmsg_data(nlh);
1014 *f = flags;
e071041b 1015 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 1016 spc.incnt = si.incnt;
1017 spc.outcnt = si.outcnt;
1018 spc.fwdcnt = si.fwdcnt;
1019 spc.inscnt = si.inscnt;
1020 spc.outscnt = si.outscnt;
1021 spc.fwdscnt = si.fwdscnt;
1022 sph.spdhcnt = si.spdhcnt;
1023 sph.spdhmcnt = si.spdhmcnt;
1024
880a6fab
CG		 1025 do {
1026 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1027
1028 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1029 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1030 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1031 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1032 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1033
1d1e34dd
DM		 1034 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1035 if (!err)
1036 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
880a6fab
CG		 1037 if (!err)
1038 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1039 if (!err)
1040 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1d1e34dd
DM		 1041 if (err) {
1042 nlmsg_cancel(skb, nlh);
1043 return err;
1044 }
ecfd6b18 1045
053c095a
JB		 1046 nlmsg_end(skb, nlh);
1047 return 0;
ecfd6b18
JHS		 1048}
1049
880a6fab
CG		 1050static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1051 struct nlattr **attrs)
1052{
1053 struct net *net = sock_net(skb->sk);
1054 struct xfrmu_spdhthresh *thresh4 = NULL;
1055 struct xfrmu_spdhthresh *thresh6 = NULL;
1056
1057 /* selector prefixlen thresholds to hash policies */
1058 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1059 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1060
1061 if (nla_len(rta) < sizeof(*thresh4))
1062 return -EINVAL;
1063 thresh4 = nla_data(rta);
1064 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1065 return -EINVAL;
1066 }
1067 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1068 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1069
1070 if (nla_len(rta) < sizeof(*thresh6))
1071 return -EINVAL;
1072 thresh6 = nla_data(rta);
1073 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1074 return -EINVAL;
1075 }
1076
1077 if (thresh4 || thresh6) {
1078 write_seqlock(&net->xfrm.policy_hthresh.lock);
1079 if (thresh4) {
1080 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1081 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1082 }
1083 if (thresh6) {
1084 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1085 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1086 }
1087 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1088
1089 xfrm_policy_hash_rebuild(net);
1090 }
1091
1092 return 0;
1093}
1094
ecfd6b18 1095static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1096 struct nlattr **attrs)
ecfd6b18 1097{
a6483b79 1098 struct net *net = sock_net(skb->sk);
ecfd6b18 1099 struct sk_buff *r_skb;
7b67c857 1100 u32 *flags = nlmsg_data(nlh);
15e47304 1101 u32 sportid = NETLINK_CB(skb).portid;
ecfd6b18 1102 u32 seq = nlh->nlmsg_seq;
ecfd6b18 1103
7deb2264 1104 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 1105 if (r_skb == NULL)
1106 return -ENOMEM;
1107
15e47304 1108 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
ecfd6b18
JHS		 1109 BUG();
1110
15e47304 1111 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
ecfd6b18
JHS		 1112}
1113
7deb2264
TG		 1114static inline size_t xfrm_sadinfo_msgsize(void)
1115{
1116 return NLMSG_ALIGN(4)
1117 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1118 + nla_total_size(4); /* XFRMA_SAD_CNT */
1119}
1120
e071041b 1121static int build_sadinfo(struct sk_buff *skb, struct net *net,
15e47304 1122 u32 portid, u32 seq, u32 flags)
28d8909b 1123{
af11e316
JHS		 1124 struct xfrmk_sadinfo si;
1125 struct xfrmu_sadhinfo sh;
28d8909b 1126 struct nlmsghdr *nlh;
1d1e34dd 1127 int err;
28d8909b
JHS		 1128 u32 *f;
1129
15e47304 1130 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 1131 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 1132 return -EMSGSIZE;
1133
1134 f = nlmsg_data(nlh);
1135 *f = flags;
e071041b 1136 xfrm_sad_getinfo(net, &si);
28d8909b 1137
af11e316
JHS		 1138 sh.sadhmcnt = si.sadhmcnt;
1139 sh.sadhcnt = si.sadhcnt;
1140
1d1e34dd
DM		 1141 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1142 if (!err)
1143 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1144 if (err) {
1145 nlmsg_cancel(skb, nlh);
1146 return err;
1147 }
28d8909b 1148
053c095a
JB		 1149 nlmsg_end(skb, nlh);
1150 return 0;
28d8909b
JHS		 1151}
1152
1153static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1154 struct nlattr **attrs)
28d8909b 1155{
a6483b79 1156 struct net *net = sock_net(skb->sk);
28d8909b 1157 struct sk_buff *r_skb;
7b67c857 1158 u32 *flags = nlmsg_data(nlh);
15e47304 1159 u32 sportid = NETLINK_CB(skb).portid;
28d8909b 1160 u32 seq = nlh->nlmsg_seq;
28d8909b 1161
7deb2264 1162 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1163 if (r_skb == NULL)
1164 return -ENOMEM;
1165
15e47304 1166 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
28d8909b
JHS		 1167 BUG();
1168
15e47304 1169 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
28d8909b
JHS		 1170}
1171
22e70050 1172static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1173 struct nlattr **attrs)
1da177e4 1174{
fc34acd3 1175 struct net *net = sock_net(skb->sk);
7b67c857 1176 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1177 struct xfrm_state *x;
1178 struct sk_buff *resp_skb;
eb2971b6 1179 int err = -ESRCH;
1da177e4 1180
fc34acd3 1181 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1182 if (x == NULL)
1183 goto out_noput;
1184
1185 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1186 if (IS_ERR(resp_skb)) {
1187 err = PTR_ERR(resp_skb);
1188 } else {
15e47304 1189 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1190 }
1191 xfrm_state_put(x);
1192out_noput:
1193 return err;
1194}
1195
22e70050 1196static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1197 struct nlattr **attrs)
1da177e4 1198{
fc34acd3 1199 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1200 struct xfrm_state *x;
1201 struct xfrm_userspi_info *p;
1202 struct sk_buff *resp_skb;
1203 xfrm_address_t *daddr;
1204 int family;
1205 int err;
6f26b61e
JHS		 1206 u32 mark;
1207 struct xfrm_mark m;
1da177e4 1208
7b67c857 1209 p = nlmsg_data(nlh);
776e9dd9 1210 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1da177e4
LT		 1211 if (err)
1212 goto out_noput;
1213
1214 family = p->info.family;
1215 daddr = &p->info.id.daddr;
1216
1217 x = NULL;
6f26b61e
JHS		 1218
1219 mark = xfrm_mark_get(attrs, &m);
1da177e4 1220 if (p->info.seq) {
6f26b61e 1221 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
70e94e66 1222 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1da177e4
LT		 1223 xfrm_state_put(x);
1224 x = NULL;
1225 }
1226 }
1227
1228 if (!x)
6f26b61e 1229 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1230 p->info.id.proto, daddr,
1231 &p->info.saddr, 1,
1232 family);
1233 err = -ENOENT;
1234 if (x == NULL)
1235 goto out_noput;
1236
658b219e
HX		 1237 err = xfrm_alloc_spi(x, p->min, p->max);
1238 if (err)
1239 goto out;
1da177e4 1240
658b219e 1241 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1242 if (IS_ERR(resp_skb)) {
1243 err = PTR_ERR(resp_skb);
1244 goto out;
1245 }
1246
15e47304 1247 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1248
1249out:
1250 xfrm_state_put(x);
1251out_noput:
1252 return err;
1253}
1254
b798a9ed 1255static int verify_policy_dir(u8 dir)
1da177e4
LT		 1256{
1257 switch (dir) {
1258 case XFRM_POLICY_IN:
1259 case XFRM_POLICY_OUT:
1260 case XFRM_POLICY_FWD:
1261 break;
1262
1263 default:
1264 return -EINVAL;
3ff50b79 1265 }
1da177e4
LT		 1266
1267 return 0;
1268}
1269
b798a9ed 1270static int verify_policy_type(u8 type)
f7b6983f
MN		 1271{
1272 switch (type) {
1273 case XFRM_POLICY_TYPE_MAIN:
1274#ifdef CONFIG_XFRM_SUB_POLICY
1275 case XFRM_POLICY_TYPE_SUB:
1276#endif
1277 break;
1278
1279 default:
1280 return -EINVAL;
3ff50b79 1281 }
f7b6983f
MN		 1282
1283 return 0;
1284}
1285
1da177e4
LT		 1286static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1287{
e682adf0
FD		 1288 int ret;
1289
1da177e4
LT		 1290 switch (p->share) {
1291 case XFRM_SHARE_ANY:
1292 case XFRM_SHARE_SESSION:
1293 case XFRM_SHARE_USER:
1294 case XFRM_SHARE_UNIQUE:
1295 break;
1296
1297 default:
1298 return -EINVAL;
3ff50b79 1299 }
1da177e4
LT		 1300
1301 switch (p->action) {
1302 case XFRM_POLICY_ALLOW:
1303 case XFRM_POLICY_BLOCK:
1304 break;
1305
1306 default:
1307 return -EINVAL;
3ff50b79 1308 }
1da177e4
LT		 1309
1310 switch (p->sel.family) {
1311 case AF_INET:
1312 break;
1313
1314 case AF_INET6:
dfd56b8b 1315#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1316 break;
1317#else
1318 return -EAFNOSUPPORT;
1319#endif
1320
1321 default:
1322 return -EINVAL;
3ff50b79 1323 }
1da177e4 1324
e682adf0
FD		 1325 ret = verify_policy_dir(p->dir);
1326 if (ret)
1327 return ret;
1328 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1329 return -EINVAL;
1330
1331 return 0;
1da177e4
LT		 1332}
1333
5424f32e 1334static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1335{
5424f32e 1336 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1337 struct xfrm_user_sec_ctx *uctx;
1338
1339 if (!rt)
1340 return 0;
1341
5424f32e 1342 uctx = nla_data(rt);
52a4c640 1343 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
df71837d
TJ		 1344}
1345
1da177e4
LT		 1346static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1347 int nr)
1348{
1349 int i;
1350
1351 xp->xfrm_nr = nr;
1352 for (i = 0; i < nr; i++, ut++) {
1353 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1354
1355 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1356 memcpy(&t->saddr, &ut->saddr,
1357 sizeof(xfrm_address_t));
1358 t->reqid = ut->reqid;
1359 t->mode = ut->mode;
1360 t->share = ut->share;
1361 t->optional = ut->optional;
1362 t->aalgos = ut->aalgos;
1363 t->ealgos = ut->ealgos;
1364 t->calgos = ut->calgos;
c5d18e98
HX		 1365 /* If all masks are ~0, then we allow all algorithms. */
1366 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1367 t->encap_family = ut->family;
1da177e4
LT		 1368 }
1369}
1370
b4ad86bf
DM		 1371static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1372{
1373 int i;
1374
1375 if (nr > XFRM_MAX_DEPTH)
1376 return -EINVAL;
1377
1378 for (i = 0; i < nr; i++) {
1379 /* We never validated the ut->family value, so many
1380 * applications simply leave it at zero. The check was
1381 * never made and ut->family was ignored because all
1382 * templates could be assumed to have the same family as
1383 * the policy itself. Now that we will have ipv4-in-ipv6
1384 * and ipv6-in-ipv4 tunnels, this is no longer true.
1385 */
1386 if (!ut[i].family)
1387 ut[i].family = family;
1388
1389 switch (ut[i].family) {
1390 case AF_INET:
1391 break;
dfd56b8b 1392#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1393 case AF_INET6:
1394 break;
1395#endif
1396 default:
1397 return -EINVAL;
3ff50b79 1398 }
b4ad86bf
DM		 1399 }
1400
1401 return 0;
1402}
1403
5424f32e 1404static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1405{
5424f32e 1406 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1407
1408 if (!rt) {
1409 pol->xfrm_nr = 0;
1410 } else {
5424f32e
TG		 1411 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1412 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1413 int err;
1da177e4 1414
b4ad86bf
DM		 1415 err = validate_tmpl(nr, utmpl, pol->family);
1416 if (err)
1417 return err;
1da177e4 1418
5424f32e 1419 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1420 }
1421 return 0;
1422}
1423
5424f32e 1424static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1425{
5424f32e 1426 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1427 struct xfrm_userpolicy_type *upt;
b798a9ed 1428 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1429 int err;
1430
1431 if (rt) {
5424f32e 1432 upt = nla_data(rt);
f7b6983f
MN		 1433 type = upt->type;
1434 }
1435
1436 err = verify_policy_type(type);
1437 if (err)
1438 return err;
1439
1440 *tp = type;
1441 return 0;
1442}
1443
1da177e4
LT		 1444static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1445{
1446 xp->priority = p->priority;
1447 xp->index = p->index;
1448 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1449 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1450 xp->action = p->action;
1451 xp->flags = p->flags;
1452 xp->family = p->sel.family;
1453 /* XXX xp->share = p->share; */
1454}
1455
1456static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1457{
7b789836 1458 memset(p, 0, sizeof(*p));
1da177e4
LT		 1459 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1460 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1461 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1462 p->priority = xp->priority;
1463 p->index = xp->index;
1464 p->sel.family = xp->family;
1465 p->dir = dir;
1466 p->action = xp->action;
1467 p->flags = xp->flags;
1468 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1469}
1470
fc34acd3 1471static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1472{
fc34acd3 1473 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1474 int err;
1475
1476 if (!xp) {
1477 *errp = -ENOMEM;
1478 return NULL;
1479 }
1480
1481 copy_from_user_policy(xp, p);
df71837d 1482
35a7aa08 1483 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1484 if (err)
1485 goto error;
1486
35a7aa08
TG		 1487 if (!(err = copy_from_user_tmpl(xp, attrs)))
1488 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1489 if (err)
1490 goto error;
1da177e4 1491
295fae56
JHS		 1492 xfrm_mark_get(attrs, &xp->mark);
1493
1da177e4 1494 return xp;
f7b6983f
MN		 1495 error:
1496 *errp = err;
12a169e7 1497 xp->walk.dead = 1;
64c31b3f 1498 xfrm_policy_destroy(xp);
f7b6983f 1499 return NULL;
1da177e4
LT		 1500}
1501
22e70050 1502static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1503 struct nlattr **attrs)
1da177e4 1504{
fc34acd3 1505 struct net *net = sock_net(skb->sk);
7b67c857 1506 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1507 struct xfrm_policy *xp;
26b15dad 1508 struct km_event c;
1da177e4
LT		 1509 int err;
1510 int excl;
1511
1512 err = verify_newpolicy_info(p);
df71837d
TJ		 1513 if (err)
1514 return err;
35a7aa08 1515 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1516 if (err)
1517 return err;
1518
fc34acd3 1519 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1520 if (!xp)
1521 return err;
1522
25985edc 1523 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1524 * Aha! this is anti-netlink really i.e more pfkey derived
1525 * in netlink excl is a flag and you wouldnt need
1526 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1527 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1528 err = xfrm_policy_insert(p->dir, xp, excl);
2e71029e 1529 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
161a09e7 1530
1da177e4 1531 if (err) {
03e1ad7b 1532 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1533 kfree(xp);
1534 return err;
1535 }
1536
f60f6b8f 1537 c.event = nlh->nlmsg_type;
26b15dad 1538 c.seq = nlh->nlmsg_seq;
15e47304 1539 c.portid = nlh->nlmsg_pid;
26b15dad
JHS		 1540 km_policy_notify(xp, p->dir, &c);
1541
1da177e4
LT		 1542 xfrm_pol_put(xp);
1543
1544 return 0;
1545}
1546
1547static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1548{
1549 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1550 int i;
1551
1552 if (xp->xfrm_nr == 0)
1553 return 0;
1554
1555 for (i = 0; i < xp->xfrm_nr; i++) {
1556 struct xfrm_user_tmpl *up = &vec[i];
1557 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1558
1f86840f 1559 memset(up, 0, sizeof(*up));
1da177e4 1560 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1561 up->family = kp->encap_family;
1da177e4
LT		 1562 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1563 up->reqid = kp->reqid;
1564 up->mode = kp->mode;
1565 up->share = kp->share;
1566 up->optional = kp->optional;
1567 up->aalgos = kp->aalgos;
1568 up->ealgos = kp->ealgos;
1569 up->calgos = kp->calgos;
1570 }
df71837d 1571
c0144bea
TG		 1572 return nla_put(skb, XFRMA_TMPL,
1573 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1574}
1575
1576static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1577{
1578 if (x->security) {
1579 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1580 }
1581 return 0;
0d681623 1582}
df71837d 1583
0d681623
SH		 1584static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1585{
1d1e34dd 1586 if (xp->security)
0d681623 1587 return copy_sec_ctx(xp->security, skb);
0d681623 1588 return 0;
df71837d 1589}
cfbfd45a
TG		 1590static inline size_t userpolicy_type_attrsize(void)
1591{
1592#ifdef CONFIG_XFRM_SUB_POLICY
1593 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1594#else
1595 return 0;
1596#endif
1597}
df71837d 1598
f7b6983f 1599#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1600static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1601{
c0144bea
TG		 1602 struct xfrm_userpolicy_type upt = {
1603 .type = type,
1604 };
f7b6983f 1605
c0144bea 1606 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1607}
1608
1609#else
b798a9ed 1610static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1611{
1612 return 0;
1613}
1614#endif
1615
1da177e4
LT		 1616static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1617{
1618 struct xfrm_dump_info *sp = ptr;
1619 struct xfrm_userpolicy_info *p;
1620 struct sk_buff *in_skb = sp->in_skb;
1621 struct sk_buff *skb = sp->out_skb;
1622 struct nlmsghdr *nlh;
1d1e34dd 1623 int err;
1da177e4 1624
15e47304 1625 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
79b8b7f4
TG		 1626 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1627 if (nlh == NULL)
1628 return -EMSGSIZE;
1da177e4 1629
7b67c857 1630 p = nlmsg_data(nlh);
1da177e4 1631 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1632 err = copy_to_user_tmpl(xp, skb);
1633 if (!err)
1634 err = copy_to_user_sec_ctx(xp, skb);
1635 if (!err)
1636 err = copy_to_user_policy_type(xp->type, skb);
1637 if (!err)
1638 err = xfrm_mark_put(skb, &xp->mark);
1639 if (err) {
1640 nlmsg_cancel(skb, nlh);
1641 return err;
1642 }
9825069d 1643 nlmsg_end(skb, nlh);
1da177e4 1644 return 0;
1da177e4
LT		 1645}
1646
4c563f76
TT		 1647static int xfrm_dump_policy_done(struct netlink_callback *cb)
1648{
1649 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
283bc9f3 1650 struct net *net = sock_net(cb->skb->sk);
4c563f76 1651
283bc9f3 1652 xfrm_policy_walk_done(walk, net);
4c563f76
TT		 1653 return 0;
1654}
1655
1da177e4
LT		 1656static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1657{
fc34acd3 1658 struct net *net = sock_net(skb->sk);
4c563f76 1659 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1660 struct xfrm_dump_info info;
1661
4c563f76
TT		 1662 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1663 sizeof(cb->args) - sizeof(cb->args[0]));
1664
1da177e4
LT		 1665 info.in_skb = cb->skb;
1666 info.out_skb = skb;
1667 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1668 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1669
1670 if (!cb->args[0]) {
1671 cb->args[0] = 1;
1672 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1673 }
1674
fc34acd3 1675 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1676
1677 return skb->len;
1678}
1679
1680static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1681 struct xfrm_policy *xp,
1682 int dir, u32 seq)
1683{
1684 struct xfrm_dump_info info;
1685 struct sk_buff *skb;
c2546372 1686 int err;
1da177e4 1687
7deb2264 1688 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1689 if (!skb)
1690 return ERR_PTR(-ENOMEM);
1691
1da177e4
LT		 1692 info.in_skb = in_skb;
1693 info.out_skb = skb;
1694 info.nlmsg_seq = seq;
1695 info.nlmsg_flags = 0;
1da177e4 1696
c2546372
MK		 1697 err = dump_one_policy(xp, dir, 0, &info);
1698 if (err) {
1da177e4 1699 kfree_skb(skb);
c2546372 1700 return ERR_PTR(err);
1da177e4
LT		 1701 }
1702
1703 return skb;
1704}
1705
22e70050 1706static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1707 struct nlattr **attrs)
1da177e4 1708{
fc34acd3 1709 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1710 struct xfrm_policy *xp;
1711 struct xfrm_userpolicy_id *p;
b798a9ed 1712 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1713 int err;
26b15dad 1714 struct km_event c;
1da177e4 1715 int delete;
295fae56
JHS		 1716 struct xfrm_mark m;
1717 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1718
7b67c857 1719 p = nlmsg_data(nlh);
1da177e4
LT		 1720 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1721
35a7aa08 1722 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1723 if (err)
1724 return err;
1725
1da177e4
LT		 1726 err = verify_policy_dir(p->dir);
1727 if (err)
1728 return err;
1729
1730 if (p->index)
295fae56 1731 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1732 else {
5424f32e 1733 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1734 struct xfrm_sec_ctx *ctx;
df71837d 1735
35a7aa08 1736 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1737 if (err)
1738 return err;
1739
2c8dd116 1740 ctx = NULL;
df71837d 1741 if (rt) {
5424f32e 1742 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1743
52a4c640 1744 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 1745 if (err)
df71837d 1746 return err;
2c8dd116 1747 }
295fae56 1748 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1749 ctx, delete, &err);
03e1ad7b 1750 security_xfrm_policy_free(ctx);
df71837d 1751 }
1da177e4
LT		 1752 if (xp == NULL)
1753 return -ENOENT;
1754
1755 if (!delete) {
1756 struct sk_buff *resp_skb;
1757
1758 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1759 if (IS_ERR(resp_skb)) {
1760 err = PTR_ERR(resp_skb);
1761 } else {
a6483b79 1762 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
15e47304 1763 NETLINK_CB(skb).portid);
1da177e4 1764 }
26b15dad 1765 } else {
2e71029e 1766 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
13fcfbb0
DM		 1767
1768 if (err != 0)
c8c05a8e 1769 goto out;
13fcfbb0 1770
e7443892 1771 c.data.byid = p->index;
f60f6b8f 1772 c.event = nlh->nlmsg_type;
26b15dad 1773 c.seq = nlh->nlmsg_seq;
15e47304 1774 c.portid = nlh->nlmsg_pid;
26b15dad 1775 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1776 }
1777
c8c05a8e 1778out:
ef41aaa0 1779 xfrm_pol_put(xp);
e4c17216
PM		 1780 if (delete && err == 0)
1781 xfrm_garbage_collect(net);
1da177e4
LT		 1782 return err;
1783}
1784
22e70050 1785static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1786 struct nlattr **attrs)
1da177e4 1787{
fc34acd3 1788 struct net *net = sock_net(skb->sk);
26b15dad 1789 struct km_event c;
7b67c857 1790 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
4aa2e62c 1791 int err;
1da177e4 1792
2e71029e 1793 err = xfrm_state_flush(net, p->proto, true);
9e64cc95
JHS		 1794 if (err) {
1795 if (err == -ESRCH) /* empty table */
1796 return 0;
069c474e 1797 return err;
9e64cc95 1798 }
bf08867f 1799 c.data.proto = p->proto;
f60f6b8f 1800 c.event = nlh->nlmsg_type;
26b15dad 1801 c.seq = nlh->nlmsg_seq;
15e47304 1802 c.portid = nlh->nlmsg_pid;
7067802e 1803 c.net = net;
26b15dad
JHS		 1804 km_state_notify(NULL, &c);
1805
1da177e4
LT		 1806 return 0;
1807}
1808
d8647b79 1809static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1810{
d8647b79
SK		 1811 size_t replay_size = x->replay_esn ?
1812 xfrm_replay_state_esn_len(x->replay_esn) :
1813 sizeof(struct xfrm_replay_state);
1814
7deb2264 1815 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1816 + nla_total_size(replay_size)
de95c4a4 1817 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1818 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1819 + nla_total_size(4) /* XFRM_AE_RTHR */
1820 + nla_total_size(4); /* XFRM_AE_ETHR */
1821}
d51d081d 1822
214e005b 1823static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1824{
1825 struct xfrm_aevent_id *id;
1826 struct nlmsghdr *nlh;
1d1e34dd 1827 int err;
d51d081d 1828
15e47304 1829 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
79b8b7f4
TG		 1830 if (nlh == NULL)
1831 return -EMSGSIZE;
d51d081d 1832
7b67c857 1833 id = nlmsg_data(nlh);
9b7a787d 1834 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
d51d081d
JHS		 1835 id->sa_id.spi = x->id.spi;
1836 id->sa_id.family = x->props.family;
1837 id->sa_id.proto = x->id.proto;
9b7a787d 1838 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2b5f6dcc 1839 id->reqid = x->props.reqid;
d51d081d
JHS		 1840 id->flags = c->data.aevent;
1841
d0fde795 1842 if (x->replay_esn) {
1d1e34dd
DM		 1843 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1844 xfrm_replay_state_esn_len(x->replay_esn),
1845 x->replay_esn);
d0fde795 1846 } else {
1d1e34dd
DM		 1847 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1848 &x->replay);
d0fde795 1849 }
1d1e34dd
DM		 1850 if (err)
1851 goto out_cancel;
de95c4a4
ND		 1852 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1853 XFRMA_PAD);
1d1e34dd
DM		 1854 if (err)
1855 goto out_cancel;
d51d081d 1856
1d1e34dd
DM		 1857 if (id->flags & XFRM_AE_RTHR) {
1858 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1859 if (err)
1860 goto out_cancel;
1861 }
1862 if (id->flags & XFRM_AE_ETHR) {
1863 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1864 x->replay_maxage * 10 / HZ);
1865 if (err)
1866 goto out_cancel;
1867 }
1868 err = xfrm_mark_put(skb, &x->mark);
1869 if (err)
1870 goto out_cancel;
6f26b61e 1871
053c095a
JB		 1872 nlmsg_end(skb, nlh);
1873 return 0;
d51d081d 1874
1d1e34dd 1875out_cancel:
9825069d 1876 nlmsg_cancel(skb, nlh);
1d1e34dd 1877 return err;
d51d081d
JHS		 1878}
1879
22e70050 1880static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1881 struct nlattr **attrs)
d51d081d 1882{
fc34acd3 1883 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1884 struct xfrm_state *x;
1885 struct sk_buff *r_skb;
1886 int err;
1887 struct km_event c;
6f26b61e
JHS		 1888 u32 mark;
1889 struct xfrm_mark m;
7b67c857 1890 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1891 struct xfrm_usersa_id *id = &p->sa_id;
1892
6f26b61e
JHS		 1893 mark = xfrm_mark_get(attrs, &m);
1894
1895 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1896 if (x == NULL)
d51d081d 1897 return -ESRCH;
d8647b79
SK		 1898
1899 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1900 if (r_skb == NULL) {
1901 xfrm_state_put(x);
1902 return -ENOMEM;
d51d081d
JHS		 1903 }
1904
1905 /*
1906 * XXX: is this lock really needed - none of the other
1907 * gets lock (the concern is things getting updated
1908 * while we are still reading) - jhs
1909 */
1910 spin_lock_bh(&x->lock);
1911 c.data.aevent = p->flags;
1912 c.seq = nlh->nlmsg_seq;
15e47304 1913 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1914
1915 if (build_aevent(r_skb, x, &c) < 0)
1916 BUG();
15e47304 1917 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
d51d081d
JHS		 1918 spin_unlock_bh(&x->lock);
1919 xfrm_state_put(x);
1920 return err;
1921}
1922
22e70050 1923static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1924 struct nlattr **attrs)
d51d081d 1925{
fc34acd3 1926 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1927 struct xfrm_state *x;
1928 struct km_event c;
02d0892f 1929 int err = -EINVAL;
6f26b61e
JHS		 1930 u32 mark = 0;
1931 struct xfrm_mark m;
7b67c857 1932 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1933 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1934 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1935 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
4e077237
MR		 1936 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1937 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 1938
4e077237 1939 if (!lt && !rp && !re && !et && !rt)
d51d081d
JHS		 1940 return err;
1941
1942 /* pedantic mode - thou shalt sayeth replaceth */
1943 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1944 return err;
1945
6f26b61e
JHS		 1946 mark = xfrm_mark_get(attrs, &m);
1947
1948 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1949 if (x == NULL)
1950 return -ESRCH;
1951
1952 if (x->km.state != XFRM_STATE_VALID)
1953 goto out;
1954
4479ff76 1955 err = xfrm_replay_verify_len(x->replay_esn, re);
e2b19125
SK		 1956 if (err)
1957 goto out;
1958
d51d081d 1959 spin_lock_bh(&x->lock);
e3ac104d 1960 xfrm_update_ae_params(x, attrs, 1);
d51d081d 1961 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1962
1963 c.event = nlh->nlmsg_type;
1964 c.seq = nlh->nlmsg_seq;
15e47304 1965 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1966 c.data.aevent = XFRM_AE_CU;
1967 km_state_notify(x, &c);
1968 err = 0;
1969out:
1970 xfrm_state_put(x);
1971 return err;
1972}
1973
22e70050 1974static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1975 struct nlattr **attrs)
1da177e4 1976{
fc34acd3 1977 struct net *net = sock_net(skb->sk);
f7b6983f 1978 struct km_event c;
b798a9ed 1979 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1980 int err;
1981
35a7aa08 1982 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1983 if (err)
1984 return err;
26b15dad 1985
2e71029e 1986 err = xfrm_policy_flush(net, type, true);
2f1eb65f
JHS		 1987 if (err) {
1988 if (err == -ESRCH) /* empty table */
1989 return 0;
069c474e 1990 return err;
2f1eb65f
JHS		 1991 }
1992
f7b6983f 1993 c.data.type = type;
f60f6b8f 1994 c.event = nlh->nlmsg_type;
26b15dad 1995 c.seq = nlh->nlmsg_seq;
15e47304 1996 c.portid = nlh->nlmsg_pid;
7067802e 1997 c.net = net;
26b15dad 1998 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1999 return 0;
2000}
2001
22e70050 2002static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2003 struct nlattr **attrs)
6c5c8ca7 2004{
fc34acd3 2005 struct net *net = sock_net(skb->sk);
6c5c8ca7 2006 struct xfrm_policy *xp;
7b67c857 2007 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 2008 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 2009 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 2010 int err = -ENOENT;
295fae56
JHS		 2011 struct xfrm_mark m;
2012 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 2013
35a7aa08 2014 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 2015 if (err)
2016 return err;
2017
c8bf4d04
TT		 2018 err = verify_policy_dir(p->dir);
2019 if (err)
2020 return err;
2021
6c5c8ca7 2022 if (p->index)
295fae56 2023 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 2024 else {
5424f32e 2025 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 2026 struct xfrm_sec_ctx *ctx;
6c5c8ca7 2027
35a7aa08 2028 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 2029 if (err)
2030 return err;
2031
2c8dd116 2032 ctx = NULL;
6c5c8ca7 2033 if (rt) {
5424f32e 2034 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 2035
52a4c640 2036 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 2037 if (err)
6c5c8ca7 2038 return err;
2c8dd116 2039 }
295fae56 2040 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 2041 &p->sel, ctx, 0, &err);
03e1ad7b 2042 security_xfrm_policy_free(ctx);
6c5c8ca7 2043 }
6c5c8ca7 2044 if (xp == NULL)
ef41aaa0 2045 return -ENOENT;
03e1ad7b 2046
ea2dea9d 2047 if (unlikely(xp->walk.dead))
6c5c8ca7 2048 goto out;
6c5c8ca7 2049
6c5c8ca7
JHS		 2050 err = 0;
2051 if (up->hard) {
2052 xfrm_policy_delete(xp, p->dir);
2e71029e 2053 xfrm_audit_policy_delete(xp, 1, true);
6c5c8ca7
JHS		 2054 } else {
2055 // reset the timers here?
0c199a90 2056 WARN(1, "Don't know what to do with soft policy expire\n");
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
IJ		 2119 if (err)
2120 goto bad_policy;
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
IJ		 2151
2152bad_policy:
62db5cfd 2153 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2154free_state:
2155 kfree(x);
2156nomem:
2157 return err;
980ebd25
JHS		 2158}
2159
5c79de6e 2160#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2161static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2162 struct xfrm_kmaddress *k,
5424f32e 2163 struct nlattr **attrs, int *num)
5c79de6e 2164{
5424f32e 2165 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2166 struct xfrm_user_migrate *um;
2167 int i, num_migrate;
2168
13c1d189
AE		 2169 if (k != NULL) {
2170 struct xfrm_user_kmaddress *uk;
2171
2172 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2173 memcpy(&k->local, &uk->local, sizeof(k->local));
2174 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2175 k->family = uk->family;
2176 k->reserved = uk->reserved;
2177 }
2178
5424f32e
TG		 2179 um = nla_data(rt);
2180 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2181
2182 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2183 return -EINVAL;
2184
2185 for (i = 0; i < num_migrate; i++, um++, ma++) {
2186 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2187 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2188 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2189 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2190
2191 ma->proto = um->proto;
2192 ma->mode = um->mode;
2193 ma->reqid = um->reqid;
2194
2195 ma->old_family = um->old_family;
2196 ma->new_family = um->new_family;
2197 }
2198
2199 *num = i;
2200 return 0;
2201}
2202
2203static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2204 struct nlattr **attrs)
5c79de6e 2205{
7b67c857 2206 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2207 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2208 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2209 u8 type;
2210 int err;
2211 int n = 0;
8d549c4f 2212 struct net *net = sock_net(skb->sk);
5c79de6e 2213
35a7aa08 2214 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2215 return -EINVAL;
5c79de6e 2216
13c1d189
AE		 2217 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2218
5424f32e 2219 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2220 if (err)
2221 return err;
2222
13c1d189 2223 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2224 if (err)
2225 return err;
2226
2227 if (!n)
2228 return 0;
2229
8d549c4f 2230 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
5c79de6e
SS		 2231
2232 return 0;
2233}
2234#else
2235static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2236 struct nlattr **attrs)
5c79de6e
SS		 2237{
2238 return -ENOPROTOOPT;
2239}
2240#endif
2241
2242#ifdef CONFIG_XFRM_MIGRATE
183cad12 2243static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2244{
2245 struct xfrm_user_migrate um;
2246
2247 memset(&um, 0, sizeof(um));
2248 um.proto = m->proto;
2249 um.mode = m->mode;
2250 um.reqid = m->reqid;
2251 um.old_family = m->old_family;
2252 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2253 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2254 um.new_family = m->new_family;
2255 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2256 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2257
c0144bea 2258 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2259}
2260
183cad12 2261static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2262{
2263 struct xfrm_user_kmaddress uk;
2264
2265 memset(&uk, 0, sizeof(uk));
2266 uk.family = k->family;
2267 uk.reserved = k->reserved;
2268 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2269 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2270
2271 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2272}
2273
2274static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2275{
2276 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2277 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2278 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2279 + userpolicy_type_attrsize();
7deb2264
TG		 2280}
2281
183cad12
DM		 2282static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2283 int num_migrate, const struct xfrm_kmaddress *k,
2284 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2285{
183cad12 2286 const struct xfrm_migrate *mp;
5c79de6e
SS		 2287 struct xfrm_userpolicy_id *pol_id;
2288 struct nlmsghdr *nlh;
1d1e34dd 2289 int i, err;
5c79de6e 2290
79b8b7f4
TG		 2291 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2292 if (nlh == NULL)
2293 return -EMSGSIZE;
5c79de6e 2294
7b67c857 2295 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2296 /* copy data from selector, dir, and type to the pol_id */
2297 memset(pol_id, 0, sizeof(*pol_id));
2298 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2299 pol_id->dir = dir;
2300
1d1e34dd
DM		 2301 if (k != NULL) {
2302 err = copy_to_user_kmaddress(k, skb);
2303 if (err)
2304 goto out_cancel;
2305 }
2306 err = copy_to_user_policy_type(type, skb);
2307 if (err)
2308 goto out_cancel;
5c79de6e 2309 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2310 err = copy_to_user_migrate(mp, skb);
2311 if (err)
2312 goto out_cancel;
5c79de6e
SS		 2313 }
2314
053c095a
JB		 2315 nlmsg_end(skb, nlh);
2316 return 0;
1d1e34dd
DM		 2317
2318out_cancel:
9825069d 2319 nlmsg_cancel(skb, nlh);
1d1e34dd 2320 return err;
5c79de6e
SS		 2321}
2322
183cad12
DM		 2323static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2324 const struct xfrm_migrate *m, int num_migrate,
2325 const struct xfrm_kmaddress *k)
5c79de6e 2326{
a6483b79 2327 struct net *net = &init_net;
5c79de6e 2328 struct sk_buff *skb;
5c79de6e 2329
13c1d189 2330 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2331 if (skb == NULL)
2332 return -ENOMEM;
2333
2334 /* build migrate */
13c1d189 2335 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2336 BUG();
2337
21ee543e 2338 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
5c79de6e
SS		 2339}
2340#else
183cad12
DM		 2341static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2342 const struct xfrm_migrate *m, int num_migrate,
2343 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2344{
2345 return -ENOPROTOOPT;
2346}
2347#endif
d51d081d 2348
a7bd9a45 2349#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2350
2351static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2352 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2353 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2354 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2355 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2356 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2357 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2358 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2359 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2360 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2361 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2362 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2363 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2364 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2365 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2366 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2367 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2368 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2369 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45 2370 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
880a6fab 2371 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
a7bd9a45 2372 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2373};
2374
492b558b
TG		 2375#undef XMSGSIZE
2376
cf5cb79f 2377static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2378 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2379 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2380 [XFRMA_LASTUSED] = { .type = NLA_U64},
2381 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2382 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2383 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2384 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2385 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2386 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2387 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2388 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2389 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2390 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2391 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2392 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2393 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2394 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2395 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2396 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2397 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2398 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2399 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2400 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
a947b0a9 2401 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
d3623099 2402 [XFRMA_PROTO] = { .type = NLA_U8 },
870a2df4 2403 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
cf5cb79f
TG		 2404};
2405
880a6fab
CG		 2406static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2407 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2408 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2409};
2410
05600a79 2411static const struct xfrm_link {
5424f32e 2412 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2413 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2414 int (*done)(struct netlink_callback *);
880a6fab
CG		 2415 const struct nla_policy *nla_pol;
2416 int nla_max;
492b558b
TG		 2417} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2418 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2419 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2420 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2421 .dump = xfrm_dump_sa,
2422 .done = xfrm_dump_sa_done },
492b558b
TG		 2423 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2424 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2425 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2426 .dump = xfrm_dump_policy,
2427 .done = xfrm_dump_policy_done },
492b558b 2428 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2429 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2430 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2431 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2432 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2433 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2434 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2435 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2436 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2437 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2438 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2439 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
880a6fab
CG		 2440 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2441 .nla_pol = xfrma_spd_policy,
2442 .nla_max = XFRMA_SPD_MAX },
ecfd6b18 2443 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2444};
2445
1d00a4eb 2446static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2447{
a6483b79 2448 struct net *net = sock_net(skb->sk);
35a7aa08 2449 struct nlattr *attrs[XFRMA_MAX+1];
05600a79 2450 const struct xfrm_link *link;
a7bd9a45 2451 int type, err;
1da177e4 2452
74005991 2453#ifdef CONFIG_COMPAT
2bf8c476 2454 if (in_compat_syscall())
74005991
FD		 2455 return -ENOTSUPP;
2456#endif
2457
1da177e4 2458 type = nlh->nlmsg_type;
1da177e4 2459 if (type > XFRM_MSG_MAX)
1d00a4eb 2460 return -EINVAL;
1da177e4
LT		 2461
2462 type -= XFRM_MSG_BASE;
2463 link = &xfrm_dispatch[type];
2464
2465 /* All operations require privileges, even GET */
90f62cf3 2466 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
1d00a4eb 2467 return -EPERM;
1da177e4 2468
492b558b
TG		 2469 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2470 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2471 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2472 if (link->dump == NULL)
1d00a4eb 2473 return -EINVAL;
88fc2c84 2474
80d326fa
PNA		 2475 {
2476 struct netlink_dump_control c = {
2477 .dump = link->dump,
2478 .done = link->done,
2479 };
2480 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2481 }
1da177e4
LT		 2482 }
2483
880a6fab
CG		 2484 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2485 link->nla_max ? : XFRMA_MAX,
2486 link->nla_pol ? : xfrma_policy);
a7bd9a45
TG		 2487 if (err < 0)
2488 return err;
1da177e4
LT		 2489
2490 if (link->doit == NULL)
1d00a4eb 2491 return -EINVAL;
1da177e4 2492
5424f32e 2493 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2494}
2495
cd40b7d3 2496static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2497{
283bc9f3
FD		 2498 struct net *net = sock_net(skb->sk);
2499
2500 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
cd40b7d3 2501 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
283bc9f3 2502 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
1da177e4
LT		 2503}
2504
7deb2264
TG		 2505static inline size_t xfrm_expire_msgsize(void)
2506{
6f26b61e
JHS		 2507 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2508 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2509}
2510
214e005b 2511static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2512{
2513 struct xfrm_user_expire *ue;
2514 struct nlmsghdr *nlh;
1d1e34dd 2515 int err;
1da177e4 2516
15e47304 2517 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
79b8b7f4
TG		 2518 if (nlh == NULL)
2519 return -EMSGSIZE;
1da177e4 2520
7b67c857 2521 ue = nlmsg_data(nlh);
1da177e4 2522 copy_to_user_state(x, &ue->state);
d51d081d 2523 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2524
1d1e34dd
DM		 2525 err = xfrm_mark_put(skb, &x->mark);
2526 if (err)
2527 return err;
6f26b61e 2528
053c095a
JB		 2529 nlmsg_end(skb, nlh);
2530 return 0;
1da177e4
LT		 2531}
2532
214e005b 2533static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2534{
fc34acd3 2535 struct net *net = xs_net(x);
1da177e4
LT		 2536 struct sk_buff *skb;
2537
7deb2264 2538 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2539 if (skb == NULL)
2540 return -ENOMEM;
2541
6f26b61e
JHS		 2542 if (build_expire(skb, x, c) < 0) {
2543 kfree_skb(skb);
2544 return -EMSGSIZE;
2545 }
1da177e4 2546
21ee543e 2547 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
1da177e4
LT		 2548}
2549
214e005b 2550static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2551{
fc34acd3 2552 struct net *net = xs_net(x);
d51d081d 2553 struct sk_buff *skb;
d51d081d 2554
d8647b79 2555 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2556 if (skb == NULL)
2557 return -ENOMEM;
2558
2559 if (build_aevent(skb, x, c) < 0)
2560 BUG();
2561
21ee543e 2562 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
d51d081d
JHS		 2563}
2564
214e005b 2565static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2566{
7067802e 2567 struct net *net = c->net;
26b15dad
JHS		 2568 struct xfrm_usersa_flush *p;
2569 struct nlmsghdr *nlh;
2570 struct sk_buff *skb;
7deb2264 2571 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2572
7deb2264 2573 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2574 if (skb == NULL)
2575 return -ENOMEM;
26b15dad 2576
15e47304 2577 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
79b8b7f4
TG		 2578 if (nlh == NULL) {
2579 kfree_skb(skb);
2580 return -EMSGSIZE;
2581 }
26b15dad 2582
7b67c857 2583 p = nlmsg_data(nlh);
bf08867f 2584 p->proto = c->data.proto;
26b15dad 2585
9825069d 2586 nlmsg_end(skb, nlh);
26b15dad 2587
21ee543e 2588 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
26b15dad
JHS		 2589}
2590
7deb2264 2591static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2592{
7deb2264 2593 size_t l = 0;
1a6509d9
HX		 2594 if (x->aead)
2595 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2596 if (x->aalg) {
2597 l += nla_total_size(sizeof(struct xfrm_algo) +
2598 (x->aalg->alg_key_len + 7) / 8);
2599 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2600 }
26b15dad 2601 if (x->ealg)
0f99be0d 2602 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2603 if (x->calg)
7deb2264 2604 l += nla_total_size(sizeof(*x->calg));
26b15dad 2605 if (x->encap)
7deb2264 2606 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2607 if (x->tfcpad)
2608 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2609 if (x->replay_esn)
2610 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
f293a5e3 2611 else
2612 l += nla_total_size(sizeof(struct xfrm_replay_state));
68325d3b
HX		 2613 if (x->security)
2614 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2615 x->security->ctx_len);
2616 if (x->coaddr)
2617 l += nla_total_size(sizeof(*x->coaddr));
a947b0a9
ND		 2618 if (x->props.extra_flags)
2619 l += nla_total_size(sizeof(x->props.extra_flags));
68325d3b 2620
d26f3984 2621 /* Must count x->lastused as it may become non-zero behind our back. */
de95c4a4 2622 l += nla_total_size_64bit(sizeof(u64));
26b15dad
JHS		 2623
2624 return l;
2625}
2626
214e005b 2627static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2628{
fc34acd3 2629 struct net *net = xs_net(x);
26b15dad 2630 struct xfrm_usersa_info *p;
0603eac0 2631 struct xfrm_usersa_id *id;
26b15dad
JHS		 2632 struct nlmsghdr *nlh;
2633 struct sk_buff *skb;
26b15dad 2634 int len = xfrm_sa_len(x);
1d1e34dd 2635 int headlen, err;
0603eac0
HX		 2636
2637 headlen = sizeof(*p);
2638 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2639 len += nla_total_size(headlen);
0603eac0 2640 headlen = sizeof(*id);
6f26b61e 2641 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2642 }
7deb2264 2643 len += NLMSG_ALIGN(headlen);
26b15dad 2644
7deb2264 2645 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2646 if (skb == NULL)
2647 return -ENOMEM;
26b15dad 2648
15e47304 2649 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2650 err = -EMSGSIZE;
79b8b7f4 2651 if (nlh == NULL)
1d1e34dd 2652 goto out_free_skb;
26b15dad 2653
7b67c857 2654 p = nlmsg_data(nlh);
0603eac0 2655 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2656 struct nlattr *attr;
2657
7b67c857 2658 id = nlmsg_data(nlh);
0603eac0
HX		 2659 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2660 id->spi = x->id.spi;
2661 id->family = x->props.family;
2662 id->proto = x->id.proto;
2663
c0144bea 2664 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2665 err = -EMSGSIZE;
c0144bea 2666 if (attr == NULL)
1d1e34dd 2667 goto out_free_skb;
c0144bea
TG		 2668
2669 p = nla_data(attr);
0603eac0 2670 }
1d1e34dd
DM		 2671 err = copy_to_user_state_extra(x, p, skb);
2672 if (err)
2673 goto out_free_skb;
26b15dad 2674
9825069d 2675 nlmsg_end(skb, nlh);
26b15dad 2676
21ee543e 2677 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
26b15dad 2678
1d1e34dd 2679out_free_skb:
26b15dad 2680 kfree_skb(skb);
1d1e34dd 2681 return err;
26b15dad
JHS		 2682}
2683
214e005b 2684static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2685{
2686
2687 switch (c->event) {
f60f6b8f 2688 case XFRM_MSG_EXPIRE:
26b15dad 2689 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2690 case XFRM_MSG_NEWAE:
2691 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2692 case XFRM_MSG_DELSA:
2693 case XFRM_MSG_UPDSA:
2694 case XFRM_MSG_NEWSA:
26b15dad 2695 return xfrm_notify_sa(x, c);
f60f6b8f 2696 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2697 return xfrm_notify_sa_flush(c);
2698 default:
62db5cfd 2699 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2700 c->event);
2701 break;
26b15dad
JHS		 2702 }
2703
2704 return 0;
2705
2706}
2707
7deb2264
TG		 2708static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2709 struct xfrm_policy *xp)
2710{
2711 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2712 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2713 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2714 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2715 + userpolicy_type_attrsize();
2716}
2717
1da177e4 2718static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
65e0736b 2719 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
1da177e4 2720{
1d1e34dd 2721 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2722 struct xfrm_user_acquire *ua;
2723 struct nlmsghdr *nlh;
1d1e34dd 2724 int err;
1da177e4 2725
79b8b7f4
TG		 2726 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2727 if (nlh == NULL)
2728 return -EMSGSIZE;
1da177e4 2729
7b67c857 2730 ua = nlmsg_data(nlh);
1da177e4
LT		 2731 memcpy(&ua->id, &x->id, sizeof(ua->id));
2732 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2733 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
65e0736b 2734 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
1da177e4
LT		 2735 ua->aalgos = xt->aalgos;
2736 ua->ealgos = xt->ealgos;
2737 ua->calgos = xt->calgos;
2738 ua->seq = x->km.seq = seq;
2739
1d1e34dd
DM		 2740 err = copy_to_user_tmpl(xp, skb);
2741 if (!err)
2742 err = copy_to_user_state_sec_ctx(x, skb);
2743 if (!err)
2744 err = copy_to_user_policy_type(xp->type, skb);
2745 if (!err)
2746 err = xfrm_mark_put(skb, &xp->mark);
2747 if (err) {
2748 nlmsg_cancel(skb, nlh);
2749 return err;
2750 }
1da177e4 2751
053c095a
JB		 2752 nlmsg_end(skb, nlh);
2753 return 0;
1da177e4
LT		 2754}
2755
2756static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
65e0736b 2757 struct xfrm_policy *xp)
1da177e4 2758{
a6483b79 2759 struct net *net = xs_net(x);
1da177e4 2760 struct sk_buff *skb;
1da177e4 2761
7deb2264 2762 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2763 if (skb == NULL)
2764 return -ENOMEM;
2765
65e0736b 2766 if (build_acquire(skb, x, xt, xp) < 0)
1da177e4
LT		 2767 BUG();
2768
21ee543e 2769 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
1da177e4
LT		 2770}
2771
2772/* User gives us xfrm_user_policy_info followed by an array of 0
2773 * or more templates.
2774 */
cb969f07 2775static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2776 u8 *data, int len, int *dir)
2777{
fc34acd3 2778 struct net *net = sock_net(sk);
1da177e4
LT		 2779 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2780 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2781 struct xfrm_policy *xp;
2782 int nr;
2783
cb969f07 2784 switch (sk->sk_family) {
1da177e4
LT		 2785 case AF_INET:
2786 if (opt != IP_XFRM_POLICY) {
2787 *dir = -EOPNOTSUPP;
2788 return NULL;
2789 }
2790 break;
dfd56b8b 2791#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2792 case AF_INET6:
2793 if (opt != IPV6_XFRM_POLICY) {
2794 *dir = -EOPNOTSUPP;
2795 return NULL;
2796 }
2797 break;
2798#endif
2799 default:
2800 *dir = -EINVAL;
2801 return NULL;
2802 }
2803
2804 *dir = -EINVAL;
2805
2806 if (len < sizeof(*p) ||
2807 verify_newpolicy_info(p))
2808 return NULL;
2809
2810 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2811 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2812 return NULL;
2813
a4f1bac6
HX		 2814 if (p->dir > XFRM_POLICY_OUT)
2815 return NULL;
2816
2f09a4d5 2817 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2818 if (xp == NULL) {
2819 *dir = -ENOBUFS;
2820 return NULL;
2821 }
2822
2823 copy_from_user_policy(xp, p);
f7b6983f 2824 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2825 copy_templates(xp, ut, nr);
2826
2827 *dir = p->dir;
2828
2829 return xp;
2830}
2831
7deb2264
TG		 2832static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2833{
2834 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2835 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2836 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2837 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2838 + userpolicy_type_attrsize();
2839}
2840
1da177e4 2841static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2842 int dir, const struct km_event *c)
1da177e4
LT		 2843{
2844 struct xfrm_user_polexpire *upe;
d51d081d 2845 int hard = c->data.hard;
1d1e34dd
DM		 2846 struct nlmsghdr *nlh;
2847 int err;
1da177e4 2848
15e47304 2849 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
79b8b7f4
TG		 2850 if (nlh == NULL)
2851 return -EMSGSIZE;
1da177e4 2852
7b67c857 2853 upe = nlmsg_data(nlh);
1da177e4 2854 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2855 err = copy_to_user_tmpl(xp, skb);
2856 if (!err)
2857 err = copy_to_user_sec_ctx(xp, skb);
2858 if (!err)
2859 err = copy_to_user_policy_type(xp->type, skb);
2860 if (!err)
2861 err = xfrm_mark_put(skb, &xp->mark);
2862 if (err) {
2863 nlmsg_cancel(skb, nlh);
2864 return err;
2865 }
1da177e4
LT		 2866 upe->hard = !!hard;
2867
053c095a
JB		 2868 nlmsg_end(skb, nlh);
2869 return 0;
1da177e4
LT		 2870}
2871
214e005b 2872static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2873{
fc34acd3 2874 struct net *net = xp_net(xp);
1da177e4 2875 struct sk_buff *skb;
1da177e4 2876
7deb2264 2877 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2878 if (skb == NULL)
2879 return -ENOMEM;
2880
d51d081d 2881 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2882 BUG();
2883
21ee543e 2884 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
1da177e4
LT		 2885}
2886
214e005b 2887static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2888{
1d1e34dd 2889 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2890 struct net *net = xp_net(xp);
26b15dad 2891 struct xfrm_userpolicy_info *p;
0603eac0 2892 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2893 struct nlmsghdr *nlh;
2894 struct sk_buff *skb;
1d1e34dd 2895 int headlen, err;
0603eac0
HX		 2896
2897 headlen = sizeof(*p);
2898 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2899 len += nla_total_size(headlen);
0603eac0
HX		 2900 headlen = sizeof(*id);
2901 }
cfbfd45a 2902 len += userpolicy_type_attrsize();
295fae56 2903 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2904 len += NLMSG_ALIGN(headlen);
26b15dad 2905
7deb2264 2906 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2907 if (skb == NULL)
2908 return -ENOMEM;
26b15dad 2909
15e47304 2910 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2911 err = -EMSGSIZE;
79b8b7f4 2912 if (nlh == NULL)
1d1e34dd 2913 goto out_free_skb;
26b15dad 2914
7b67c857 2915 p = nlmsg_data(nlh);
0603eac0 2916 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2917 struct nlattr *attr;
2918
7b67c857 2919 id = nlmsg_data(nlh);
0603eac0
HX		 2920 memset(id, 0, sizeof(*id));
2921 id->dir = dir;
2922 if (c->data.byid)
2923 id->index = xp->index;
2924 else
2925 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2926
c0144bea 2927 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2928 err = -EMSGSIZE;
c0144bea 2929 if (attr == NULL)
1d1e34dd 2930 goto out_free_skb;
c0144bea
TG		 2931
2932 p = nla_data(attr);
0603eac0 2933 }
26b15dad 2934
26b15dad 2935 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2936 err = copy_to_user_tmpl(xp, skb);
2937 if (!err)
2938 err = copy_to_user_policy_type(xp->type, skb);
2939 if (!err)
2940 err = xfrm_mark_put(skb, &xp->mark);
2941 if (err)
2942 goto out_free_skb;
295fae56 2943
9825069d 2944 nlmsg_end(skb, nlh);
26b15dad 2945
21ee543e 2946 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
26b15dad 2947
1d1e34dd 2948out_free_skb:
26b15dad 2949 kfree_skb(skb);
1d1e34dd 2950 return err;
26b15dad
JHS		 2951}
2952
214e005b 2953static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2954{
7067802e 2955 struct net *net = c->net;
26b15dad
JHS		 2956 struct nlmsghdr *nlh;
2957 struct sk_buff *skb;
1d1e34dd 2958 int err;
26b15dad 2959
7deb2264 2960 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2961 if (skb == NULL)
2962 return -ENOMEM;
26b15dad 2963
15e47304 2964 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2965 err = -EMSGSIZE;
79b8b7f4 2966 if (nlh == NULL)
1d1e34dd
DM		 2967 goto out_free_skb;
2968 err = copy_to_user_policy_type(c->data.type, skb);
2969 if (err)
2970 goto out_free_skb;
26b15dad 2971
9825069d 2972 nlmsg_end(skb, nlh);
26b15dad 2973
21ee543e 2974 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
26b15dad 2975
1d1e34dd 2976out_free_skb:
26b15dad 2977 kfree_skb(skb);
1d1e34dd 2978 return err;
26b15dad
JHS		 2979}
2980
214e005b 2981static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2982{
2983
2984 switch (c->event) {
f60f6b8f
HX		 2985 case XFRM_MSG_NEWPOLICY:
2986 case XFRM_MSG_UPDPOLICY:
2987 case XFRM_MSG_DELPOLICY:
26b15dad 2988 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2989 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2990 return xfrm_notify_policy_flush(c);
f60f6b8f 2991 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2992 return xfrm_exp_policy_notify(xp, dir, c);
2993 default:
62db5cfd 2994 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2995 c->event);
26b15dad
JHS		 2996 }
2997
2998 return 0;
2999
3000}
3001
7deb2264
TG		 3002static inline size_t xfrm_report_msgsize(void)
3003{
3004 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3005}
3006
97a64b45
MN		 3007static int build_report(struct sk_buff *skb, u8 proto,
3008 struct xfrm_selector *sel, xfrm_address_t *addr)
3009{
3010 struct xfrm_user_report *ur;
3011 struct nlmsghdr *nlh;
97a64b45 3012
79b8b7f4
TG		 3013 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3014 if (nlh == NULL)
3015 return -EMSGSIZE;
97a64b45 3016
7b67c857 3017 ur = nlmsg_data(nlh);
97a64b45
MN		 3018 ur->proto = proto;
3019 memcpy(&ur->sel, sel, sizeof(ur->sel));
3020
1d1e34dd
DM		 3021 if (addr) {
3022 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3023 if (err) {
3024 nlmsg_cancel(skb, nlh);
3025 return err;
3026 }
3027 }
053c095a
JB		 3028 nlmsg_end(skb, nlh);
3029 return 0;
97a64b45
MN		 3030}
3031
db983c11
AD		 3032static int xfrm_send_report(struct net *net, u8 proto,
3033 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 3034{
3035 struct sk_buff *skb;
97a64b45 3036
7deb2264 3037 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 3038 if (skb == NULL)
3039 return -ENOMEM;
3040
3041 if (build_report(skb, proto, sel, addr) < 0)
3042 BUG();
3043
21ee543e 3044 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
97a64b45
MN		 3045}
3046
3a2dfbe8
MW		 3047static inline size_t xfrm_mapping_msgsize(void)
3048{
3049 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3050}
3051
3052static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3053 xfrm_address_t *new_saddr, __be16 new_sport)
3054{
3055 struct xfrm_user_mapping *um;
3056 struct nlmsghdr *nlh;
3057
3058 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3059 if (nlh == NULL)
3060 return -EMSGSIZE;
3061
3062 um = nlmsg_data(nlh);
3063
3064 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3065 um->id.spi = x->id.spi;
3066 um->id.family = x->props.family;
3067 um->id.proto = x->id.proto;
3068 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3069 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3070 um->new_sport = new_sport;
3071 um->old_sport = x->encap->encap_sport;
3072 um->reqid = x->props.reqid;
3073
053c095a
JB		 3074 nlmsg_end(skb, nlh);
3075 return 0;
3a2dfbe8
MW		 3076}
3077
3078static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3079 __be16 sport)
3080{
a6483b79 3081 struct net *net = xs_net(x);
3a2dfbe8
MW		 3082 struct sk_buff *skb;
3083
3084 if (x->id.proto != IPPROTO_ESP)
3085 return -EINVAL;
3086
3087 if (!x->encap)
3088 return -EINVAL;
3089
3090 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3091 if (skb == NULL)
3092 return -ENOMEM;
3093
3094 if (build_mapping(skb, x, ipaddr, sport) < 0)
3095 BUG();
3096
21ee543e 3097 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3a2dfbe8
MW		 3098}
3099
0f24558e
HG		 3100static bool xfrm_is_alive(const struct km_event *c)
3101{
3102 return (bool)xfrm_acquire_is_on(c->net);
3103}
3104
1da177e4
LT		 3105static struct xfrm_mgr netlink_mgr = {
3106 .id = "netlink",
3107 .notify = xfrm_send_state_notify,
3108 .acquire = xfrm_send_acquire,
3109 .compile_policy = xfrm_compile_policy,
3110 .notify_policy = xfrm_send_policy_notify,
97a64b45 3111 .report = xfrm_send_report,
5c79de6e 3112 .migrate = xfrm_send_migrate,
3a2dfbe8 3113 .new_mapping = xfrm_send_mapping,
0f24558e 3114 .is_alive = xfrm_is_alive,
1da177e4
LT		 3115};
3116
a6483b79 3117static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 3118{
be33690d 3119 struct sock *nlsk;
a31f2d17
PNA		 3120 struct netlink_kernel_cfg cfg = {
3121 .groups = XFRMNLGRP_MAX,
3122 .input = xfrm_netlink_rcv,
3123 };
be33690d 3124
9f00d977 3125 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
be33690d 3126 if (nlsk == NULL)
1da177e4 3127 return -ENOMEM;
d79d792e 3128 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 3129 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 3130 return 0;
3131}
3132
d79d792e 3133static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 3134{
d79d792e
EB		 3135 struct net *net;
3136 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 3137 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 3138 synchronize_net();
3139 list_for_each_entry(net, net_exit_list, exit_list)
3140 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 3141}
3142
a6483b79 3143static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 3144 .init = xfrm_user_net_init,
3145 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 3146};
3147
3148static int __init xfrm_user_init(void)
3149{
3150 int rv;
3151
3152 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3153
3154 rv = register_pernet_subsys(&xfrm_user_net_ops);
3155 if (rv < 0)
3156 return rv;
3157 rv = xfrm_register_km(&netlink_mgr);
3158 if (rv < 0)
3159 unregister_pernet_subsys(&xfrm_user_net_ops);
3160 return rv;
3161}
3162
3163static void __exit xfrm_user_exit(void)
3164{
3165 xfrm_unregister_km(&netlink_mgr);
3166 unregister_pernet_subsys(&xfrm_user_net_ops);
3167}
3168
1da177e4
LT		 3169module_init(xfrm_user_init);
3170module_exit(xfrm_user_exit);
3171MODULE_LICENSE("GPL");
4fdb3bb7 3172MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3173
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