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xfrm: rename struct xfrm_filter
[deliverable/linux.git] / net / xfrm / xfrm_user.c
CommitLineData
1da177e4
LT		 1/* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
df71837d 10 *
1da177e4
LT		 11 */
12
9409f38a 13#include <linux/crypto.h>
1da177e4
LT		 14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/net.h>
21#include <linux/skbuff.h>
1da177e4
LT		 22#include <linux/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
88fc2c84 28#include <net/netlink.h>
fa6dd8a2 29#include <net/ah.h>
1da177e4 30#include <asm/uaccess.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 32#include <linux/in6.h>
33#endif
1da177e4 34
1a6509d9
HX		 35static inline int aead_len(struct xfrm_algo_aead *alg)
36{
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38}
39
5424f32e 40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 41{
5424f32e 42 struct nlattr *rt = attrs[type];
1da177e4
LT		 43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
5424f32e 48 algp = nla_data(rt);
0f99be0d 49 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 50 return -EINVAL;
51
1da177e4
LT		 52 switch (type) {
53 case XFRMA_ALG_AUTH:
1da177e4 54 case XFRMA_ALG_CRYPT:
1da177e4 55 case XFRMA_ALG_COMP:
1da177e4
LT		 56 break;
57
58 default:
59 return -EINVAL;
3ff50b79 60 }
1da177e4
LT		 61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64}
65
4447bb33
MW		 66static int verify_auth_trunc(struct nlattr **attrs)
67{
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80}
81
1a6509d9
HX		 82static int verify_aead(struct nlattr **attrs)
83{
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96}
97
5424f32e 98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 99 xfrm_address_t **addrp)
100{
5424f32e 101 struct nlattr *rt = attrs[type];
eb2971b6 102
cf5cb79f 103 if (rt && addrp)
5424f32e 104 *addrp = nla_data(rt);
eb2971b6 105}
df71837d 106
5424f32e 107static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 108{
5424f32e 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 110 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 111
112 if (!rt)
113 return 0;
114
5424f32e 115 uctx = nla_data(rt);
cf5cb79f 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 117 return -EINVAL;
118
119 return 0;
120}
121
d8647b79
SK		 122static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124{
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
ecd79187 126 struct xfrm_replay_state_esn *rs;
d8647b79 127
ecd79187
MK		 128 if (p->flags & XFRM_STATE_ESN) {
129 if (!rt)
130 return -EINVAL;
131
132 rs = nla_data(rt);
133
134 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
135 return -EINVAL;
136
137 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
138 nla_len(rt) != sizeof(*rs))
139 return -EINVAL;
140 }
7833aa05 141
d8647b79
SK		 142 if (!rt)
143 return 0;
144
01714109
FD		 145 /* As only ESP and AH support ESN feature. */
146 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
02aadf72
SK		 147 return -EINVAL;
148
d8647b79
SK		 149 if (p->replay_window != 0)
150 return -EINVAL;
151
152 return 0;
153}
df71837d 154
1da177e4 155static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 156 struct nlattr **attrs)
1da177e4
LT		 157{
158 int err;
159
160 err = -EINVAL;
161 switch (p->family) {
162 case AF_INET:
163 break;
164
165 case AF_INET6:
dfd56b8b 166#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 167 break;
168#else
169 err = -EAFNOSUPPORT;
170 goto out;
171#endif
172
173 default:
174 goto out;
3ff50b79 175 }
1da177e4
LT		 176
177 err = -EINVAL;
178 switch (p->id.proto) {
179 case IPPROTO_AH:
4447bb33
MW		 180 if ((!attrs[XFRMA_ALG_AUTH] &&
181 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 182 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 183 attrs[XFRMA_ALG_CRYPT] ||
35d2856b 184 attrs[XFRMA_ALG_COMP] ||
ea9884b3
FD		 185 attrs[XFRMA_TFCPAD] ||
186 (ntohl(p->id.spi) >= 0x10000))
187
1da177e4
LT		 188 goto out;
189 break;
190
191 case IPPROTO_ESP:
1a6509d9
HX		 192 if (attrs[XFRMA_ALG_COMP])
193 goto out;
194 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 195 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 196 !attrs[XFRMA_ALG_CRYPT] &&
197 !attrs[XFRMA_ALG_AEAD])
198 goto out;
199 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 200 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 201 attrs[XFRMA_ALG_CRYPT]) &&
202 attrs[XFRMA_ALG_AEAD])
1da177e4 203 goto out;
35d2856b
MW		 204 if (attrs[XFRMA_TFCPAD] &&
205 p->mode != XFRM_MODE_TUNNEL)
206 goto out;
1da177e4
LT		 207 break;
208
209 case IPPROTO_COMP:
35a7aa08 210 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 211 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 212 attrs[XFRMA_ALG_AUTH] ||
4447bb33 213 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b
MW		 214 attrs[XFRMA_ALG_CRYPT] ||
215 attrs[XFRMA_TFCPAD])
1da177e4
LT		 216 goto out;
217 break;
218
dfd56b8b 219#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 220 case IPPROTO_DSTOPTS:
221 case IPPROTO_ROUTING:
35a7aa08
TG		 222 if (attrs[XFRMA_ALG_COMP] ||
223 attrs[XFRMA_ALG_AUTH] ||
4447bb33 224 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9 225 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 226 attrs[XFRMA_ALG_CRYPT] ||
227 attrs[XFRMA_ENCAP] ||
228 attrs[XFRMA_SEC_CTX] ||
35d2856b 229 attrs[XFRMA_TFCPAD] ||
35a7aa08 230 !attrs[XFRMA_COADDR])
e23c7194
MN		 231 goto out;
232 break;
233#endif
234
1da177e4
LT		 235 default:
236 goto out;
3ff50b79 237 }
1da177e4 238
1a6509d9
HX		 239 if ((err = verify_aead(attrs)))
240 goto out;
4447bb33
MW		 241 if ((err = verify_auth_trunc(attrs)))
242 goto out;
35a7aa08 243 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 244 goto out;
35a7aa08 245 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 246 goto out;
35a7aa08 247 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 248 goto out;
35a7aa08 249 if ((err = verify_sec_ctx_len(attrs)))
df71837d 250 goto out;
d8647b79
SK		 251 if ((err = verify_replay(p, attrs)))
252 goto out;
1da177e4
LT		 253
254 err = -EINVAL;
255 switch (p->mode) {
7e49e6de
MN		 256 case XFRM_MODE_TRANSPORT:
257 case XFRM_MODE_TUNNEL:
060f02a3 258 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 259 case XFRM_MODE_BEET:
1da177e4
LT		 260 break;
261
262 default:
263 goto out;
3ff50b79 264 }
1da177e4
LT		 265
266 err = 0;
267
268out:
269 return err;
270}
271
272static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
6f2f19ed 273 struct xfrm_algo_desc *(*get_byname)(const char *, int),
5424f32e 274 struct nlattr *rta)
1da177e4 275{
1da177e4
LT		 276 struct xfrm_algo *p, *ualg;
277 struct xfrm_algo_desc *algo;
278
279 if (!rta)
280 return 0;
281
5424f32e 282 ualg = nla_data(rta);
1da177e4
LT		 283
284 algo = get_byname(ualg->alg_name, 1);
285 if (!algo)
286 return -ENOSYS;
287 *props = algo->desc.sadb_alg_id;
288
0f99be0d 289 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 290 if (!p)
291 return -ENOMEM;
292
04ff1260 293 strcpy(p->alg_name, algo->name);
1da177e4
LT		 294 *algpp = p;
295 return 0;
296}
297
4447bb33
MW		 298static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
299 struct nlattr *rta)
300{
301 struct xfrm_algo *ualg;
302 struct xfrm_algo_auth *p;
303 struct xfrm_algo_desc *algo;
304
305 if (!rta)
306 return 0;
307
308 ualg = nla_data(rta);
309
310 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
311 if (!algo)
312 return -ENOSYS;
313 *props = algo->desc.sadb_alg_id;
314
315 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
316 if (!p)
317 return -ENOMEM;
318
319 strcpy(p->alg_name, algo->name);
320 p->alg_key_len = ualg->alg_key_len;
321 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
322 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
323
324 *algpp = p;
325 return 0;
326}
327
328static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
329 struct nlattr *rta)
330{
331 struct xfrm_algo_auth *p, *ualg;
332 struct xfrm_algo_desc *algo;
333
334 if (!rta)
335 return 0;
336
337 ualg = nla_data(rta);
338
339 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
340 if (!algo)
341 return -ENOSYS;
fa6dd8a2
ND		 342 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
343 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 344 return -EINVAL;
345 *props = algo->desc.sadb_alg_id;
346
347 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
348 if (!p)
349 return -ENOMEM;
350
351 strcpy(p->alg_name, algo->name);
352 if (!p->alg_trunc_len)
353 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
354
355 *algpp = p;
356 return 0;
357}
358
1a6509d9
HX		 359static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
360 struct nlattr *rta)
361{
362 struct xfrm_algo_aead *p, *ualg;
363 struct xfrm_algo_desc *algo;
364
365 if (!rta)
366 return 0;
367
368 ualg = nla_data(rta);
369
370 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
371 if (!algo)
372 return -ENOSYS;
373 *props = algo->desc.sadb_alg_id;
374
375 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
376 if (!p)
377 return -ENOMEM;
378
379 strcpy(p->alg_name, algo->name);
380 *algpp = p;
381 return 0;
382}
383
e2b19125
SK		 384static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
385 struct nlattr *rp)
386{
387 struct xfrm_replay_state_esn *up;
ecd79187 388 int ulen;
e2b19125
SK		 389
390 if (!replay_esn || !rp)
391 return 0;
392
393 up = nla_data(rp);
ecd79187 394 ulen = xfrm_replay_state_esn_len(up);
e2b19125 395
ecd79187 396 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
e2b19125
SK		 397 return -EINVAL;
398
399 return 0;
400}
401
d8647b79
SK		 402static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
403 struct xfrm_replay_state_esn **preplay_esn,
404 struct nlattr *rta)
405{
406 struct xfrm_replay_state_esn *p, *pp, *up;
ecd79187 407 int klen, ulen;
d8647b79
SK		 408
409 if (!rta)
410 return 0;
411
412 up = nla_data(rta);
ecd79187
MK		 413 klen = xfrm_replay_state_esn_len(up);
414 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
d8647b79 415
ecd79187 416 p = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 417 if (!p)
418 return -ENOMEM;
419
ecd79187 420 pp = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 421 if (!pp) {
422 kfree(p);
423 return -ENOMEM;
424 }
425
ecd79187
MK		 426 memcpy(p, up, ulen);
427 memcpy(pp, up, ulen);
428
d8647b79
SK		 429 *replay_esn = p;
430 *preplay_esn = pp;
431
432 return 0;
433}
434
661697f7 435static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 436{
df71837d
TJ		 437 int len = 0;
438
439 if (xfrm_ctx) {
440 len += sizeof(struct xfrm_user_sec_ctx);
441 len += xfrm_ctx->ctx_len;
442 }
443 return len;
444}
445
1da177e4
LT		 446static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
447{
448 memcpy(&x->id, &p->id, sizeof(x->id));
449 memcpy(&x->sel, &p->sel, sizeof(x->sel));
450 memcpy(&x->lft, &p->lft, sizeof(x->lft));
451 x->props.mode = p->mode;
33fce60d
FD		 452 x->props.replay_window = min_t(unsigned int, p->replay_window,
453 sizeof(x->replay.bitmap) * 8);
1da177e4
LT		 454 x->props.reqid = p->reqid;
455 x->props.family = p->family;
54489c14 456 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 457 x->props.flags = p->flags;
196b0036 458
ccf9b3b8 459 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 460 x->sel.family = p->family;
1da177e4
LT		 461}
462
d51d081d
JHS		 463/*
464 * someday when pfkey also has support, we could have the code
465 * somehow made shareable and move it to xfrm_state.c - JHS
466 *
467*/
e3ac104d
MK		 468static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
469 int update_esn)
d51d081d 470{
5424f32e 471 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
e3ac104d 472 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
5424f32e
TG		 473 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
474 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
475 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 476
d8647b79
SK		 477 if (re) {
478 struct xfrm_replay_state_esn *replay_esn;
479 replay_esn = nla_data(re);
480 memcpy(x->replay_esn, replay_esn,
481 xfrm_replay_state_esn_len(replay_esn));
482 memcpy(x->preplay_esn, replay_esn,
483 xfrm_replay_state_esn_len(replay_esn));
484 }
485
d51d081d
JHS		 486 if (rp) {
487 struct xfrm_replay_state *replay;
5424f32e 488 replay = nla_data(rp);
d51d081d
JHS		 489 memcpy(&x->replay, replay, sizeof(*replay));
490 memcpy(&x->preplay, replay, sizeof(*replay));
491 }
492
493 if (lt) {
494 struct xfrm_lifetime_cur *ltime;
5424f32e 495 ltime = nla_data(lt);
d51d081d
JHS		 496 x->curlft.bytes = ltime->bytes;
497 x->curlft.packets = ltime->packets;
498 x->curlft.add_time = ltime->add_time;
499 x->curlft.use_time = ltime->use_time;
500 }
501
cf5cb79f 502 if (et)
5424f32e 503 x->replay_maxage = nla_get_u32(et);
d51d081d 504
cf5cb79f 505 if (rt)
5424f32e 506 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 507}
508
fc34acd3
AD		 509static struct xfrm_state *xfrm_state_construct(struct net *net,
510 struct xfrm_usersa_info *p,
5424f32e 511 struct nlattr **attrs,
1da177e4
LT		 512 int *errp)
513{
fc34acd3 514 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 515 int err = -ENOMEM;
516
517 if (!x)
518 goto error_no_put;
519
520 copy_from_user_state(x, p);
521
a947b0a9
ND		 522 if (attrs[XFRMA_SA_EXTRA_FLAGS])
523 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
524
1a6509d9
HX		 525 if ((err = attach_aead(&x->aead, &x->props.ealgo,
526 attrs[XFRMA_ALG_AEAD])))
527 goto error;
4447bb33
MW		 528 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
529 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 530 goto error;
4447bb33
MW		 531 if (!x->props.aalgo) {
532 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
533 attrs[XFRMA_ALG_AUTH])))
534 goto error;
535 }
1da177e4
LT		 536 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
537 xfrm_ealg_get_byname,
35a7aa08 538 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 539 goto error;
540 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
541 xfrm_calg_get_byname,
35a7aa08 542 attrs[XFRMA_ALG_COMP])))
1da177e4 543 goto error;
fd21150a
TG		 544
545 if (attrs[XFRMA_ENCAP]) {
546 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
547 sizeof(*x->encap), GFP_KERNEL);
548 if (x->encap == NULL)
549 goto error;
550 }
551
35d2856b
MW		 552 if (attrs[XFRMA_TFCPAD])
553 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
554
fd21150a
TG		 555 if (attrs[XFRMA_COADDR]) {
556 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
557 sizeof(*x->coaddr), GFP_KERNEL);
558 if (x->coaddr == NULL)
559 goto error;
560 }
561
6f26b61e
JHS		 562 xfrm_mark_get(attrs, &x->mark);
563
a454f0cc 564 err = __xfrm_init_state(x, false);
1da177e4
LT		 565 if (err)
566 goto error;
567
fd21150a
TG		 568 if (attrs[XFRMA_SEC_CTX] &&
569 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 570 goto error;
571
d8647b79
SK		 572 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
573 attrs[XFRMA_REPLAY_ESN_VAL])))
574 goto error;
575
1da177e4 576 x->km.seq = p->seq;
b27aeadb 577 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 578 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 579 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 580
9fdc4883
SK		 581 if ((err = xfrm_init_replay(x)))
582 goto error;
d51d081d 583
9fdc4883 584 /* override default values from above */
e3ac104d 585 xfrm_update_ae_params(x, attrs, 0);
1da177e4
LT		 586
587 return x;
588
589error:
590 x->km.state = XFRM_STATE_DEAD;
591 xfrm_state_put(x);
592error_no_put:
593 *errp = err;
594 return NULL;
595}
596
22e70050 597static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 598 struct nlattr **attrs)
1da177e4 599{
fc34acd3 600 struct net *net = sock_net(skb->sk);
7b67c857 601 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 602 struct xfrm_state *x;
603 int err;
26b15dad 604 struct km_event c;
e1760bd5 605 kuid_t loginuid = audit_get_loginuid(current);
4440e854 606 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed 607 u32 sid;
1da177e4 608
35a7aa08 609 err = verify_newsa_info(p, attrs);
1da177e4
LT		 610 if (err)
611 return err;
612
fc34acd3 613 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 614 if (!x)
615 return err;
616
26b15dad 617 xfrm_state_hold(x);
1da177e4
LT		 618 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
619 err = xfrm_state_add(x);
620 else
621 err = xfrm_state_update(x);
622
c53fa1ed 623 security_task_getsecid(current, &sid);
2532386f 624 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 625
1da177e4
LT		 626 if (err < 0) {
627 x->km.state = XFRM_STATE_DEAD;
21380b81 628 __xfrm_state_put(x);
7d6dfe1f 629 goto out;
1da177e4
LT		 630 }
631
26b15dad 632 c.seq = nlh->nlmsg_seq;
15e47304 633 c.portid = nlh->nlmsg_pid;
f60f6b8f 634 c.event = nlh->nlmsg_type;
26b15dad
JHS		 635
636 km_state_notify(x, &c);
7d6dfe1f 637out:
26b15dad 638 xfrm_state_put(x);
1da177e4
LT		 639 return err;
640}
641
fc34acd3
AD		 642static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
643 struct xfrm_usersa_id *p,
5424f32e 644 struct nlattr **attrs,
eb2971b6
MN		 645 int *errp)
646{
647 struct xfrm_state *x = NULL;
6f26b61e 648 struct xfrm_mark m;
eb2971b6 649 int err;
6f26b61e 650 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 651
652 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
653 err = -ESRCH;
6f26b61e 654 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 655 } else {
656 xfrm_address_t *saddr = NULL;
657
35a7aa08 658 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 659 if (!saddr) {
660 err = -EINVAL;
661 goto out;
662 }
663
9abbffee 664 err = -ESRCH;
6f26b61e
JHS		 665 x = xfrm_state_lookup_byaddr(net, mark,
666 &p->daddr, saddr,
221df1ed 667 p->proto, p->family);
eb2971b6
MN		 668 }
669
670 out:
671 if (!x && errp)
672 *errp = err;
673 return x;
674}
675
22e70050 676static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 677 struct nlattr **attrs)
1da177e4 678{
fc34acd3 679 struct net *net = sock_net(skb->sk);
1da177e4 680 struct xfrm_state *x;
eb2971b6 681 int err = -ESRCH;
26b15dad 682 struct km_event c;
7b67c857 683 struct xfrm_usersa_id *p = nlmsg_data(nlh);
e1760bd5 684 kuid_t loginuid = audit_get_loginuid(current);
4440e854 685 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed 686 u32 sid;
1da177e4 687
fc34acd3 688 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 689 if (x == NULL)
eb2971b6 690 return err;
1da177e4 691
6f68dc37 692 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 693 goto out;
694
1da177e4 695 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 696 err = -EPERM;
697 goto out;
1da177e4
LT		 698 }
699
26b15dad 700 err = xfrm_state_delete(x);
161a09e7 701
c8c05a8e
CZ		 702 if (err < 0)
703 goto out;
26b15dad
JHS		 704
705 c.seq = nlh->nlmsg_seq;
15e47304 706 c.portid = nlh->nlmsg_pid;
f60f6b8f 707 c.event = nlh->nlmsg_type;
26b15dad 708 km_state_notify(x, &c);
1da177e4 709
c8c05a8e 710out:
c53fa1ed 711 security_task_getsecid(current, &sid);
2532386f 712 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
c8c05a8e 713 xfrm_state_put(x);
26b15dad 714 return err;
1da177e4
LT		 715}
716
717static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
718{
f778a636 719 memset(p, 0, sizeof(*p));
1da177e4
LT		 720 memcpy(&p->id, &x->id, sizeof(p->id));
721 memcpy(&p->sel, &x->sel, sizeof(p->sel));
722 memcpy(&p->lft, &x->lft, sizeof(p->lft));
723 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
724 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 725 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 726 p->mode = x->props.mode;
727 p->replay_window = x->props.replay_window;
728 p->reqid = x->props.reqid;
729 p->family = x->props.family;
730 p->flags = x->props.flags;
731 p->seq = x->km.seq;
732}
733
734struct xfrm_dump_info {
735 struct sk_buff *in_skb;
736 struct sk_buff *out_skb;
737 u32 nlmsg_seq;
738 u16 nlmsg_flags;
1da177e4
LT		 739};
740
c0144bea
TG		 741static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
742{
c0144bea
TG		 743 struct xfrm_user_sec_ctx *uctx;
744 struct nlattr *attr;
68325d3b 745 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 746
747 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
748 if (attr == NULL)
749 return -EMSGSIZE;
750
751 uctx = nla_data(attr);
752 uctx->exttype = XFRMA_SEC_CTX;
753 uctx->len = ctx_size;
754 uctx->ctx_doi = s->ctx_doi;
755 uctx->ctx_alg = s->ctx_alg;
756 uctx->ctx_len = s->ctx_len;
757 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
758
759 return 0;
760}
761
4447bb33
MW		 762static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
763{
764 struct xfrm_algo *algo;
765 struct nlattr *nla;
766
767 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
768 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
769 if (!nla)
770 return -EMSGSIZE;
771
772 algo = nla_data(nla);
4c87308b 773 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 774 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
775 algo->alg_key_len = auth->alg_key_len;
776
777 return 0;
778}
779
68325d3b
HX		 780/* Don't change this without updating xfrm_sa_len! */
781static int copy_to_user_state_extra(struct xfrm_state *x,
782 struct xfrm_usersa_info *p,
783 struct sk_buff *skb)
1da177e4 784{
1d1e34dd 785 int ret = 0;
d0fde795 786
1d1e34dd 787 copy_to_user_state(x, p);
68325d3b 788
a947b0a9
ND		 789 if (x->props.extra_flags) {
790 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
791 x->props.extra_flags);
792 if (ret)
793 goto out;
794 }
795
1d1e34dd
DM		 796 if (x->coaddr) {
797 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
798 if (ret)
799 goto out;
800 }
801 if (x->lastused) {
802 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
803 if (ret)
804 goto out;
805 }
806 if (x->aead) {
807 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
808 if (ret)
809 goto out;
810 }
811 if (x->aalg) {
812 ret = copy_to_user_auth(x->aalg, skb);
813 if (!ret)
814 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
815 xfrm_alg_auth_len(x->aalg), x->aalg);
816 if (ret)
817 goto out;
818 }
819 if (x->ealg) {
820 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
821 if (ret)
822 goto out;
823 }
824 if (x->calg) {
825 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
826 if (ret)
827 goto out;
828 }
829 if (x->encap) {
830 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
831 if (ret)
832 goto out;
833 }
834 if (x->tfcpad) {
835 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
836 if (ret)
837 goto out;
838 }
839 ret = xfrm_mark_put(skb, &x->mark);
840 if (ret)
841 goto out;
842 if (x->replay_esn) {
843 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
844 xfrm_replay_state_esn_len(x->replay_esn),
845 x->replay_esn);
846 if (ret)
847 goto out;
848 }
849 if (x->security)
850 ret = copy_sec_ctx(x->security, skb);
851out:
852 return ret;
68325d3b
HX		 853}
854
855static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
856{
857 struct xfrm_dump_info *sp = ptr;
858 struct sk_buff *in_skb = sp->in_skb;
859 struct sk_buff *skb = sp->out_skb;
860 struct xfrm_usersa_info *p;
861 struct nlmsghdr *nlh;
862 int err;
863
15e47304 864 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
68325d3b
HX		 865 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
866 if (nlh == NULL)
867 return -EMSGSIZE;
868
869 p = nlmsg_data(nlh);
870
871 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 872 if (err) {
873 nlmsg_cancel(skb, nlh);
874 return err;
875 }
9825069d 876 nlmsg_end(skb, nlh);
1da177e4 877 return 0;
1da177e4
LT		 878}
879
4c563f76
TT		 880static int xfrm_dump_sa_done(struct netlink_callback *cb)
881{
882 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
283bc9f3
FD		 883 struct sock *sk = cb->skb->sk;
884 struct net *net = sock_net(sk);
885
886 xfrm_state_walk_done(walk, net);
4c563f76
TT		 887 return 0;
888}
889
d3623099 890static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1da177e4
LT		 891static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
892{
fc34acd3 893 struct net *net = sock_net(skb->sk);
4c563f76 894 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 895 struct xfrm_dump_info info;
896
4c563f76
TT		 897 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
898 sizeof(cb->args) - sizeof(cb->args[0]));
899
1da177e4
LT		 900 info.in_skb = cb->skb;
901 info.out_skb = skb;
902 info.nlmsg_seq = cb->nlh->nlmsg_seq;
903 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 904
905 if (!cb->args[0]) {
d3623099 906 struct nlattr *attrs[XFRMA_MAX+1];
870a2df4 907 struct xfrm_address_filter *filter = NULL;
d3623099
ND		 908 u8 proto = 0;
909 int err;
910
4c563f76 911 cb->args[0] = 1;
d3623099
ND		 912
913 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
914 xfrma_policy);
915 if (err < 0)
916 return err;
917
870a2df4 918 if (attrs[XFRMA_ADDRESS_FILTER]) {
d3623099
ND		 919 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
920 if (filter == NULL)
921 return -ENOMEM;
922
870a2df4 923 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
d3623099
ND		 924 sizeof(*filter));
925 }
926
927 if (attrs[XFRMA_PROTO])
928 proto = nla_get_u8(attrs[XFRMA_PROTO]);
929
930 xfrm_state_walk_init(walk, proto, filter);
4c563f76
TT		 931 }
932
fc34acd3 933 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 934
935 return skb->len;
936}
937
938static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
939 struct xfrm_state *x, u32 seq)
940{
941 struct xfrm_dump_info info;
942 struct sk_buff *skb;
864745d2 943 int err;
1da177e4 944
7deb2264 945 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 946 if (!skb)
947 return ERR_PTR(-ENOMEM);
948
1da177e4
LT		 949 info.in_skb = in_skb;
950 info.out_skb = skb;
951 info.nlmsg_seq = seq;
952 info.nlmsg_flags = 0;
1da177e4 953
864745d2
MK		 954 err = dump_one_state(x, 0, &info);
955 if (err) {
1da177e4 956 kfree_skb(skb);
864745d2 957 return ERR_PTR(err);
1da177e4
LT		 958 }
959
960 return skb;
961}
962
7deb2264
TG		 963static inline size_t xfrm_spdinfo_msgsize(void)
964{
965 return NLMSG_ALIGN(4)
966 + nla_total_size(sizeof(struct xfrmu_spdinfo))
967 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
968}
969
e071041b 970static int build_spdinfo(struct sk_buff *skb, struct net *net,
15e47304 971 u32 portid, u32 seq, u32 flags)
ecfd6b18 972{
5a6d3416
JHS		 973 struct xfrmk_spdinfo si;
974 struct xfrmu_spdinfo spc;
975 struct xfrmu_spdhinfo sph;
ecfd6b18 976 struct nlmsghdr *nlh;
1d1e34dd 977 int err;
ecfd6b18
JHS		 978 u32 *f;
979
15e47304 980 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 981 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 982 return -EMSGSIZE;
983
984 f = nlmsg_data(nlh);
985 *f = flags;
e071041b 986 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 987 spc.incnt = si.incnt;
988 spc.outcnt = si.outcnt;
989 spc.fwdcnt = si.fwdcnt;
990 spc.inscnt = si.inscnt;
991 spc.outscnt = si.outscnt;
992 spc.fwdscnt = si.fwdscnt;
993 sph.spdhcnt = si.spdhcnt;
994 sph.spdhmcnt = si.spdhmcnt;
995
1d1e34dd
DM		 996 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
997 if (!err)
998 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
999 if (err) {
1000 nlmsg_cancel(skb, nlh);
1001 return err;
1002 }
ecfd6b18
JHS		 1003
1004 return nlmsg_end(skb, nlh);
ecfd6b18
JHS		 1005}
1006
1007static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1008 struct nlattr **attrs)
ecfd6b18 1009{
a6483b79 1010 struct net *net = sock_net(skb->sk);
ecfd6b18 1011 struct sk_buff *r_skb;
7b67c857 1012 u32 *flags = nlmsg_data(nlh);
15e47304 1013 u32 sportid = NETLINK_CB(skb).portid;
ecfd6b18 1014 u32 seq = nlh->nlmsg_seq;
ecfd6b18 1015
7deb2264 1016 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 1017 if (r_skb == NULL)
1018 return -ENOMEM;
1019
15e47304 1020 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
ecfd6b18
JHS		 1021 BUG();
1022
15e47304 1023 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
ecfd6b18
JHS		 1024}
1025
7deb2264
TG		 1026static inline size_t xfrm_sadinfo_msgsize(void)
1027{
1028 return NLMSG_ALIGN(4)
1029 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1030 + nla_total_size(4); /* XFRMA_SAD_CNT */
1031}
1032
e071041b 1033static int build_sadinfo(struct sk_buff *skb, struct net *net,
15e47304 1034 u32 portid, u32 seq, u32 flags)
28d8909b 1035{
af11e316
JHS		 1036 struct xfrmk_sadinfo si;
1037 struct xfrmu_sadhinfo sh;
28d8909b 1038 struct nlmsghdr *nlh;
1d1e34dd 1039 int err;
28d8909b
JHS		 1040 u32 *f;
1041
15e47304 1042 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 1043 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 1044 return -EMSGSIZE;
1045
1046 f = nlmsg_data(nlh);
1047 *f = flags;
e071041b 1048 xfrm_sad_getinfo(net, &si);
28d8909b 1049
af11e316
JHS		 1050 sh.sadhmcnt = si.sadhmcnt;
1051 sh.sadhcnt = si.sadhcnt;
1052
1d1e34dd
DM		 1053 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1054 if (!err)
1055 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1056 if (err) {
1057 nlmsg_cancel(skb, nlh);
1058 return err;
1059 }
28d8909b
JHS		 1060
1061 return nlmsg_end(skb, nlh);
28d8909b
JHS		 1062}
1063
1064static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1065 struct nlattr **attrs)
28d8909b 1066{
a6483b79 1067 struct net *net = sock_net(skb->sk);
28d8909b 1068 struct sk_buff *r_skb;
7b67c857 1069 u32 *flags = nlmsg_data(nlh);
15e47304 1070 u32 sportid = NETLINK_CB(skb).portid;
28d8909b 1071 u32 seq = nlh->nlmsg_seq;
28d8909b 1072
7deb2264 1073 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1074 if (r_skb == NULL)
1075 return -ENOMEM;
1076
15e47304 1077 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
28d8909b
JHS		 1078 BUG();
1079
15e47304 1080 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
28d8909b
JHS		 1081}
1082
22e70050 1083static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1084 struct nlattr **attrs)
1da177e4 1085{
fc34acd3 1086 struct net *net = sock_net(skb->sk);
7b67c857 1087 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1088 struct xfrm_state *x;
1089 struct sk_buff *resp_skb;
eb2971b6 1090 int err = -ESRCH;
1da177e4 1091
fc34acd3 1092 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1093 if (x == NULL)
1094 goto out_noput;
1095
1096 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1097 if (IS_ERR(resp_skb)) {
1098 err = PTR_ERR(resp_skb);
1099 } else {
15e47304 1100 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1101 }
1102 xfrm_state_put(x);
1103out_noput:
1104 return err;
1105}
1106
22e70050 1107static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1108 struct nlattr **attrs)
1da177e4 1109{
fc34acd3 1110 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1111 struct xfrm_state *x;
1112 struct xfrm_userspi_info *p;
1113 struct sk_buff *resp_skb;
1114 xfrm_address_t *daddr;
1115 int family;
1116 int err;
6f26b61e
JHS		 1117 u32 mark;
1118 struct xfrm_mark m;
1da177e4 1119
7b67c857 1120 p = nlmsg_data(nlh);
776e9dd9 1121 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1da177e4
LT		 1122 if (err)
1123 goto out_noput;
1124
1125 family = p->info.family;
1126 daddr = &p->info.id.daddr;
1127
1128 x = NULL;
6f26b61e
JHS		 1129
1130 mark = xfrm_mark_get(attrs, &m);
1da177e4 1131 if (p->info.seq) {
6f26b61e 1132 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
70e94e66 1133 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1da177e4
LT		 1134 xfrm_state_put(x);
1135 x = NULL;
1136 }
1137 }
1138
1139 if (!x)
6f26b61e 1140 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1141 p->info.id.proto, daddr,
1142 &p->info.saddr, 1,
1143 family);
1144 err = -ENOENT;
1145 if (x == NULL)
1146 goto out_noput;
1147
658b219e
HX		 1148 err = xfrm_alloc_spi(x, p->min, p->max);
1149 if (err)
1150 goto out;
1da177e4 1151
658b219e 1152 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1153 if (IS_ERR(resp_skb)) {
1154 err = PTR_ERR(resp_skb);
1155 goto out;
1156 }
1157
15e47304 1158 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1159
1160out:
1161 xfrm_state_put(x);
1162out_noput:
1163 return err;
1164}
1165
b798a9ed 1166static int verify_policy_dir(u8 dir)
1da177e4
LT		 1167{
1168 switch (dir) {
1169 case XFRM_POLICY_IN:
1170 case XFRM_POLICY_OUT:
1171 case XFRM_POLICY_FWD:
1172 break;
1173
1174 default:
1175 return -EINVAL;
3ff50b79 1176 }
1da177e4
LT		 1177
1178 return 0;
1179}
1180
b798a9ed 1181static int verify_policy_type(u8 type)
f7b6983f
MN		 1182{
1183 switch (type) {
1184 case XFRM_POLICY_TYPE_MAIN:
1185#ifdef CONFIG_XFRM_SUB_POLICY
1186 case XFRM_POLICY_TYPE_SUB:
1187#endif
1188 break;
1189
1190 default:
1191 return -EINVAL;
3ff50b79 1192 }
f7b6983f
MN		 1193
1194 return 0;
1195}
1196
1da177e4
LT		 1197static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1198{
e682adf0
FD		 1199 int ret;
1200
1da177e4
LT		 1201 switch (p->share) {
1202 case XFRM_SHARE_ANY:
1203 case XFRM_SHARE_SESSION:
1204 case XFRM_SHARE_USER:
1205 case XFRM_SHARE_UNIQUE:
1206 break;
1207
1208 default:
1209 return -EINVAL;
3ff50b79 1210 }
1da177e4
LT		 1211
1212 switch (p->action) {
1213 case XFRM_POLICY_ALLOW:
1214 case XFRM_POLICY_BLOCK:
1215 break;
1216
1217 default:
1218 return -EINVAL;
3ff50b79 1219 }
1da177e4
LT		 1220
1221 switch (p->sel.family) {
1222 case AF_INET:
1223 break;
1224
1225 case AF_INET6:
dfd56b8b 1226#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1227 break;
1228#else
1229 return -EAFNOSUPPORT;
1230#endif
1231
1232 default:
1233 return -EINVAL;
3ff50b79 1234 }
1da177e4 1235
e682adf0
FD		 1236 ret = verify_policy_dir(p->dir);
1237 if (ret)
1238 return ret;
1239 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1240 return -EINVAL;
1241
1242 return 0;
1da177e4
LT		 1243}
1244
5424f32e 1245static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1246{
5424f32e 1247 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1248 struct xfrm_user_sec_ctx *uctx;
1249
1250 if (!rt)
1251 return 0;
1252
5424f32e 1253 uctx = nla_data(rt);
03e1ad7b 1254 return security_xfrm_policy_alloc(&pol->security, uctx);
df71837d
TJ		 1255}
1256
1da177e4
LT		 1257static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1258 int nr)
1259{
1260 int i;
1261
1262 xp->xfrm_nr = nr;
1263 for (i = 0; i < nr; i++, ut++) {
1264 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1265
1266 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1267 memcpy(&t->saddr, &ut->saddr,
1268 sizeof(xfrm_address_t));
1269 t->reqid = ut->reqid;
1270 t->mode = ut->mode;
1271 t->share = ut->share;
1272 t->optional = ut->optional;
1273 t->aalgos = ut->aalgos;
1274 t->ealgos = ut->ealgos;
1275 t->calgos = ut->calgos;
c5d18e98
HX		 1276 /* If all masks are ~0, then we allow all algorithms. */
1277 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1278 t->encap_family = ut->family;
1da177e4
LT		 1279 }
1280}
1281
b4ad86bf
DM		 1282static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1283{
1284 int i;
1285
1286 if (nr > XFRM_MAX_DEPTH)
1287 return -EINVAL;
1288
1289 for (i = 0; i < nr; i++) {
1290 /* We never validated the ut->family value, so many
1291 * applications simply leave it at zero. The check was
1292 * never made and ut->family was ignored because all
1293 * templates could be assumed to have the same family as
1294 * the policy itself. Now that we will have ipv4-in-ipv6
1295 * and ipv6-in-ipv4 tunnels, this is no longer true.
1296 */
1297 if (!ut[i].family)
1298 ut[i].family = family;
1299
1300 switch (ut[i].family) {
1301 case AF_INET:
1302 break;
dfd56b8b 1303#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1304 case AF_INET6:
1305 break;
1306#endif
1307 default:
1308 return -EINVAL;
3ff50b79 1309 }
b4ad86bf
DM		 1310 }
1311
1312 return 0;
1313}
1314
5424f32e 1315static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1316{
5424f32e 1317 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1318
1319 if (!rt) {
1320 pol->xfrm_nr = 0;
1321 } else {
5424f32e
TG		 1322 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1323 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1324 int err;
1da177e4 1325
b4ad86bf
DM		 1326 err = validate_tmpl(nr, utmpl, pol->family);
1327 if (err)
1328 return err;
1da177e4 1329
5424f32e 1330 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1331 }
1332 return 0;
1333}
1334
5424f32e 1335static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1336{
5424f32e 1337 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1338 struct xfrm_userpolicy_type *upt;
b798a9ed 1339 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1340 int err;
1341
1342 if (rt) {
5424f32e 1343 upt = nla_data(rt);
f7b6983f
MN		 1344 type = upt->type;
1345 }
1346
1347 err = verify_policy_type(type);
1348 if (err)
1349 return err;
1350
1351 *tp = type;
1352 return 0;
1353}
1354
1da177e4
LT		 1355static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1356{
1357 xp->priority = p->priority;
1358 xp->index = p->index;
1359 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1360 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1361 xp->action = p->action;
1362 xp->flags = p->flags;
1363 xp->family = p->sel.family;
1364 /* XXX xp->share = p->share; */
1365}
1366
1367static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1368{
7b789836 1369 memset(p, 0, sizeof(*p));
1da177e4
LT		 1370 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1371 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1372 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1373 p->priority = xp->priority;
1374 p->index = xp->index;
1375 p->sel.family = xp->family;
1376 p->dir = dir;
1377 p->action = xp->action;
1378 p->flags = xp->flags;
1379 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1380}
1381
fc34acd3 1382static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1383{
fc34acd3 1384 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1385 int err;
1386
1387 if (!xp) {
1388 *errp = -ENOMEM;
1389 return NULL;
1390 }
1391
1392 copy_from_user_policy(xp, p);
df71837d 1393
35a7aa08 1394 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1395 if (err)
1396 goto error;
1397
35a7aa08
TG		 1398 if (!(err = copy_from_user_tmpl(xp, attrs)))
1399 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1400 if (err)
1401 goto error;
1da177e4 1402
295fae56
JHS		 1403 xfrm_mark_get(attrs, &xp->mark);
1404
1da177e4 1405 return xp;
f7b6983f
MN		 1406 error:
1407 *errp = err;
12a169e7 1408 xp->walk.dead = 1;
64c31b3f 1409 xfrm_policy_destroy(xp);
f7b6983f 1410 return NULL;
1da177e4
LT		 1411}
1412
22e70050 1413static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1414 struct nlattr **attrs)
1da177e4 1415{
fc34acd3 1416 struct net *net = sock_net(skb->sk);
7b67c857 1417 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1418 struct xfrm_policy *xp;
26b15dad 1419 struct km_event c;
1da177e4
LT		 1420 int err;
1421 int excl;
e1760bd5 1422 kuid_t loginuid = audit_get_loginuid(current);
4440e854 1423 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed 1424 u32 sid;
1da177e4
LT		 1425
1426 err = verify_newpolicy_info(p);
df71837d
TJ		 1427 if (err)
1428 return err;
35a7aa08 1429 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1430 if (err)
1431 return err;
1432
fc34acd3 1433 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1434 if (!xp)
1435 return err;
1436
25985edc 1437 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1438 * Aha! this is anti-netlink really i.e more pfkey derived
1439 * in netlink excl is a flag and you wouldnt need
1440 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1441 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1442 err = xfrm_policy_insert(p->dir, xp, excl);
c53fa1ed 1443 security_task_getsecid(current, &sid);
2532386f 1444 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 1445
1da177e4 1446 if (err) {
03e1ad7b 1447 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1448 kfree(xp);
1449 return err;
1450 }
1451
f60f6b8f 1452 c.event = nlh->nlmsg_type;
26b15dad 1453 c.seq = nlh->nlmsg_seq;
15e47304 1454 c.portid = nlh->nlmsg_pid;
26b15dad
JHS		 1455 km_policy_notify(xp, p->dir, &c);
1456
1da177e4
LT		 1457 xfrm_pol_put(xp);
1458
1459 return 0;
1460}
1461
1462static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1463{
1464 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1465 int i;
1466
1467 if (xp->xfrm_nr == 0)
1468 return 0;
1469
1470 for (i = 0; i < xp->xfrm_nr; i++) {
1471 struct xfrm_user_tmpl *up = &vec[i];
1472 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1473
1f86840f 1474 memset(up, 0, sizeof(*up));
1da177e4 1475 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1476 up->family = kp->encap_family;
1da177e4
LT		 1477 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1478 up->reqid = kp->reqid;
1479 up->mode = kp->mode;
1480 up->share = kp->share;
1481 up->optional = kp->optional;
1482 up->aalgos = kp->aalgos;
1483 up->ealgos = kp->ealgos;
1484 up->calgos = kp->calgos;
1485 }
df71837d 1486
c0144bea
TG		 1487 return nla_put(skb, XFRMA_TMPL,
1488 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1489}
1490
1491static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1492{
1493 if (x->security) {
1494 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1495 }
1496 return 0;
0d681623 1497}
df71837d 1498
0d681623
SH		 1499static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1500{
1d1e34dd 1501 if (xp->security)
0d681623 1502 return copy_sec_ctx(xp->security, skb);
0d681623 1503 return 0;
df71837d 1504}
cfbfd45a
TG		 1505static inline size_t userpolicy_type_attrsize(void)
1506{
1507#ifdef CONFIG_XFRM_SUB_POLICY
1508 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1509#else
1510 return 0;
1511#endif
1512}
df71837d 1513
f7b6983f 1514#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1515static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1516{
c0144bea
TG		 1517 struct xfrm_userpolicy_type upt = {
1518 .type = type,
1519 };
f7b6983f 1520
c0144bea 1521 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1522}
1523
1524#else
b798a9ed 1525static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1526{
1527 return 0;
1528}
1529#endif
1530
1da177e4
LT		 1531static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1532{
1533 struct xfrm_dump_info *sp = ptr;
1534 struct xfrm_userpolicy_info *p;
1535 struct sk_buff *in_skb = sp->in_skb;
1536 struct sk_buff *skb = sp->out_skb;
1537 struct nlmsghdr *nlh;
1d1e34dd 1538 int err;
1da177e4 1539
15e47304 1540 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
79b8b7f4
TG		 1541 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1542 if (nlh == NULL)
1543 return -EMSGSIZE;
1da177e4 1544
7b67c857 1545 p = nlmsg_data(nlh);
1da177e4 1546 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1547 err = copy_to_user_tmpl(xp, skb);
1548 if (!err)
1549 err = copy_to_user_sec_ctx(xp, skb);
1550 if (!err)
1551 err = copy_to_user_policy_type(xp->type, skb);
1552 if (!err)
1553 err = xfrm_mark_put(skb, &xp->mark);
1554 if (err) {
1555 nlmsg_cancel(skb, nlh);
1556 return err;
1557 }
9825069d 1558 nlmsg_end(skb, nlh);
1da177e4 1559 return 0;
1da177e4
LT		 1560}
1561
4c563f76
TT		 1562static int xfrm_dump_policy_done(struct netlink_callback *cb)
1563{
1564 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
283bc9f3 1565 struct net *net = sock_net(cb->skb->sk);
4c563f76 1566
283bc9f3 1567 xfrm_policy_walk_done(walk, net);
4c563f76
TT		 1568 return 0;
1569}
1570
1da177e4
LT		 1571static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1572{
fc34acd3 1573 struct net *net = sock_net(skb->sk);
4c563f76 1574 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1575 struct xfrm_dump_info info;
1576
4c563f76
TT		 1577 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1578 sizeof(cb->args) - sizeof(cb->args[0]));
1579
1da177e4
LT		 1580 info.in_skb = cb->skb;
1581 info.out_skb = skb;
1582 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1583 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1584
1585 if (!cb->args[0]) {
1586 cb->args[0] = 1;
1587 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1588 }
1589
fc34acd3 1590 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1591
1592 return skb->len;
1593}
1594
1595static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1596 struct xfrm_policy *xp,
1597 int dir, u32 seq)
1598{
1599 struct xfrm_dump_info info;
1600 struct sk_buff *skb;
c2546372 1601 int err;
1da177e4 1602
7deb2264 1603 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1604 if (!skb)
1605 return ERR_PTR(-ENOMEM);
1606
1da177e4
LT		 1607 info.in_skb = in_skb;
1608 info.out_skb = skb;
1609 info.nlmsg_seq = seq;
1610 info.nlmsg_flags = 0;
1da177e4 1611
c2546372
MK		 1612 err = dump_one_policy(xp, dir, 0, &info);
1613 if (err) {
1da177e4 1614 kfree_skb(skb);
c2546372 1615 return ERR_PTR(err);
1da177e4
LT		 1616 }
1617
1618 return skb;
1619}
1620
22e70050 1621static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1622 struct nlattr **attrs)
1da177e4 1623{
fc34acd3 1624 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1625 struct xfrm_policy *xp;
1626 struct xfrm_userpolicy_id *p;
b798a9ed 1627 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1628 int err;
26b15dad 1629 struct km_event c;
1da177e4 1630 int delete;
295fae56
JHS		 1631 struct xfrm_mark m;
1632 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1633
7b67c857 1634 p = nlmsg_data(nlh);
1da177e4
LT		 1635 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1636
35a7aa08 1637 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1638 if (err)
1639 return err;
1640
1da177e4
LT		 1641 err = verify_policy_dir(p->dir);
1642 if (err)
1643 return err;
1644
1645 if (p->index)
295fae56 1646 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1647 else {
5424f32e 1648 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1649 struct xfrm_sec_ctx *ctx;
df71837d 1650
35a7aa08 1651 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1652 if (err)
1653 return err;
1654
2c8dd116 1655 ctx = NULL;
df71837d 1656 if (rt) {
5424f32e 1657 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1658
03e1ad7b
PM		 1659 err = security_xfrm_policy_alloc(&ctx, uctx);
1660 if (err)
df71837d 1661 return err;
2c8dd116 1662 }
295fae56 1663 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1664 ctx, delete, &err);
03e1ad7b 1665 security_xfrm_policy_free(ctx);
df71837d 1666 }
1da177e4
LT		 1667 if (xp == NULL)
1668 return -ENOENT;
1669
1670 if (!delete) {
1671 struct sk_buff *resp_skb;
1672
1673 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1674 if (IS_ERR(resp_skb)) {
1675 err = PTR_ERR(resp_skb);
1676 } else {
a6483b79 1677 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
15e47304 1678 NETLINK_CB(skb).portid);
1da177e4 1679 }
26b15dad 1680 } else {
e1760bd5 1681 kuid_t loginuid = audit_get_loginuid(current);
4440e854 1682 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed 1683 u32 sid;
2532386f 1684
c53fa1ed 1685 security_task_getsecid(current, &sid);
2532386f
EP		 1686 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1687 sid);
13fcfbb0
DM		 1688
1689 if (err != 0)
c8c05a8e 1690 goto out;
13fcfbb0 1691
e7443892 1692 c.data.byid = p->index;
f60f6b8f 1693 c.event = nlh->nlmsg_type;
26b15dad 1694 c.seq = nlh->nlmsg_seq;
15e47304 1695 c.portid = nlh->nlmsg_pid;
26b15dad 1696 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1697 }
1698
c8c05a8e 1699out:
ef41aaa0 1700 xfrm_pol_put(xp);
e4c17216
PM		 1701 if (delete && err == 0)
1702 xfrm_garbage_collect(net);
1da177e4
LT		 1703 return err;
1704}
1705
22e70050 1706static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1707 struct nlattr **attrs)
1da177e4 1708{
fc34acd3 1709 struct net *net = sock_net(skb->sk);
26b15dad 1710 struct km_event c;
7b67c857 1711 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
161a09e7 1712 struct xfrm_audit audit_info;
4aa2e62c 1713 int err;
1da177e4 1714
c53fa1ed
PM		 1715 audit_info.loginuid = audit_get_loginuid(current);
1716 audit_info.sessionid = audit_get_sessionid(current);
1717 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1718 err = xfrm_state_flush(net, p->proto, &audit_info);
9e64cc95
JHS		 1719 if (err) {
1720 if (err == -ESRCH) /* empty table */
1721 return 0;
069c474e 1722 return err;
9e64cc95 1723 }
bf08867f 1724 c.data.proto = p->proto;
f60f6b8f 1725 c.event = nlh->nlmsg_type;
26b15dad 1726 c.seq = nlh->nlmsg_seq;
15e47304 1727 c.portid = nlh->nlmsg_pid;
7067802e 1728 c.net = net;
26b15dad
JHS		 1729 km_state_notify(NULL, &c);
1730
1da177e4
LT		 1731 return 0;
1732}
1733
d8647b79 1734static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1735{
d8647b79
SK		 1736 size_t replay_size = x->replay_esn ?
1737 xfrm_replay_state_esn_len(x->replay_esn) :
1738 sizeof(struct xfrm_replay_state);
1739
7deb2264 1740 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1741 + nla_total_size(replay_size)
7deb2264 1742 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1743 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1744 + nla_total_size(4) /* XFRM_AE_RTHR */
1745 + nla_total_size(4); /* XFRM_AE_ETHR */
1746}
d51d081d 1747
214e005b 1748static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1749{
1750 struct xfrm_aevent_id *id;
1751 struct nlmsghdr *nlh;
1d1e34dd 1752 int err;
d51d081d 1753
15e47304 1754 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
79b8b7f4
TG		 1755 if (nlh == NULL)
1756 return -EMSGSIZE;
d51d081d 1757
7b67c857 1758 id = nlmsg_data(nlh);
9b7a787d 1759 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
d51d081d
JHS		 1760 id->sa_id.spi = x->id.spi;
1761 id->sa_id.family = x->props.family;
1762 id->sa_id.proto = x->id.proto;
9b7a787d 1763 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2b5f6dcc 1764 id->reqid = x->props.reqid;
d51d081d
JHS		 1765 id->flags = c->data.aevent;
1766
d0fde795 1767 if (x->replay_esn) {
1d1e34dd
DM		 1768 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1769 xfrm_replay_state_esn_len(x->replay_esn),
1770 x->replay_esn);
d0fde795 1771 } else {
1d1e34dd
DM		 1772 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1773 &x->replay);
d0fde795 1774 }
1d1e34dd
DM		 1775 if (err)
1776 goto out_cancel;
1777 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1778 if (err)
1779 goto out_cancel;
d51d081d 1780
1d1e34dd
DM		 1781 if (id->flags & XFRM_AE_RTHR) {
1782 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1783 if (err)
1784 goto out_cancel;
1785 }
1786 if (id->flags & XFRM_AE_ETHR) {
1787 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1788 x->replay_maxage * 10 / HZ);
1789 if (err)
1790 goto out_cancel;
1791 }
1792 err = xfrm_mark_put(skb, &x->mark);
1793 if (err)
1794 goto out_cancel;
6f26b61e 1795
9825069d 1796 return nlmsg_end(skb, nlh);
d51d081d 1797
1d1e34dd 1798out_cancel:
9825069d 1799 nlmsg_cancel(skb, nlh);
1d1e34dd 1800 return err;
d51d081d
JHS		 1801}
1802
22e70050 1803static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1804 struct nlattr **attrs)
d51d081d 1805{
fc34acd3 1806 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1807 struct xfrm_state *x;
1808 struct sk_buff *r_skb;
1809 int err;
1810 struct km_event c;
6f26b61e
JHS		 1811 u32 mark;
1812 struct xfrm_mark m;
7b67c857 1813 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1814 struct xfrm_usersa_id *id = &p->sa_id;
1815
6f26b61e
JHS		 1816 mark = xfrm_mark_get(attrs, &m);
1817
1818 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1819 if (x == NULL)
d51d081d 1820 return -ESRCH;
d8647b79
SK		 1821
1822 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1823 if (r_skb == NULL) {
1824 xfrm_state_put(x);
1825 return -ENOMEM;
d51d081d
JHS		 1826 }
1827
1828 /*
1829 * XXX: is this lock really needed - none of the other
1830 * gets lock (the concern is things getting updated
1831 * while we are still reading) - jhs
1832 */
1833 spin_lock_bh(&x->lock);
1834 c.data.aevent = p->flags;
1835 c.seq = nlh->nlmsg_seq;
15e47304 1836 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1837
1838 if (build_aevent(r_skb, x, &c) < 0)
1839 BUG();
15e47304 1840 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
d51d081d
JHS		 1841 spin_unlock_bh(&x->lock);
1842 xfrm_state_put(x);
1843 return err;
1844}
1845
22e70050 1846static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1847 struct nlattr **attrs)
d51d081d 1848{
fc34acd3 1849 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1850 struct xfrm_state *x;
1851 struct km_event c;
02d0892f 1852 int err = -EINVAL;
6f26b61e
JHS		 1853 u32 mark = 0;
1854 struct xfrm_mark m;
7b67c857 1855 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1856 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1857 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1858 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1859
d8647b79 1860 if (!lt && !rp && !re)
d51d081d
JHS		 1861 return err;
1862
1863 /* pedantic mode - thou shalt sayeth replaceth */
1864 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1865 return err;
1866
6f26b61e
JHS		 1867 mark = xfrm_mark_get(attrs, &m);
1868
1869 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1870 if (x == NULL)
1871 return -ESRCH;
1872
1873 if (x->km.state != XFRM_STATE_VALID)
1874 goto out;
1875
4479ff76 1876 err = xfrm_replay_verify_len(x->replay_esn, re);
e2b19125
SK		 1877 if (err)
1878 goto out;
1879
d51d081d 1880 spin_lock_bh(&x->lock);
e3ac104d 1881 xfrm_update_ae_params(x, attrs, 1);
d51d081d 1882 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1883
1884 c.event = nlh->nlmsg_type;
1885 c.seq = nlh->nlmsg_seq;
15e47304 1886 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1887 c.data.aevent = XFRM_AE_CU;
1888 km_state_notify(x, &c);
1889 err = 0;
1890out:
1891 xfrm_state_put(x);
1892 return err;
1893}
1894
22e70050 1895static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1896 struct nlattr **attrs)
1da177e4 1897{
fc34acd3 1898 struct net *net = sock_net(skb->sk);
f7b6983f 1899 struct km_event c;
b798a9ed 1900 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1901 int err;
161a09e7 1902 struct xfrm_audit audit_info;
f7b6983f 1903
35a7aa08 1904 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1905 if (err)
1906 return err;
26b15dad 1907
c53fa1ed
PM		 1908 audit_info.loginuid = audit_get_loginuid(current);
1909 audit_info.sessionid = audit_get_sessionid(current);
1910 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1911 err = xfrm_policy_flush(net, type, &audit_info);
2f1eb65f
JHS		 1912 if (err) {
1913 if (err == -ESRCH) /* empty table */
1914 return 0;
069c474e 1915 return err;
2f1eb65f
JHS		 1916 }
1917
f7b6983f 1918 c.data.type = type;
f60f6b8f 1919 c.event = nlh->nlmsg_type;
26b15dad 1920 c.seq = nlh->nlmsg_seq;
15e47304 1921 c.portid = nlh->nlmsg_pid;
7067802e 1922 c.net = net;
26b15dad 1923 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1924 return 0;
1925}
1926
22e70050 1927static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1928 struct nlattr **attrs)
6c5c8ca7 1929{
fc34acd3 1930 struct net *net = sock_net(skb->sk);
6c5c8ca7 1931 struct xfrm_policy *xp;
7b67c857 1932 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1933 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1934 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1935 int err = -ENOENT;
295fae56
JHS		 1936 struct xfrm_mark m;
1937 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1938
35a7aa08 1939 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1940 if (err)
1941 return err;
1942
c8bf4d04
TT		 1943 err = verify_policy_dir(p->dir);
1944 if (err)
1945 return err;
1946
6c5c8ca7 1947 if (p->index)
295fae56 1948 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1949 else {
5424f32e 1950 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1951 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1952
35a7aa08 1953 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1954 if (err)
1955 return err;
1956
2c8dd116 1957 ctx = NULL;
6c5c8ca7 1958 if (rt) {
5424f32e 1959 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1960
03e1ad7b
PM		 1961 err = security_xfrm_policy_alloc(&ctx, uctx);
1962 if (err)
6c5c8ca7 1963 return err;
2c8dd116 1964 }
295fae56 1965 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 1966 &p->sel, ctx, 0, &err);
03e1ad7b 1967 security_xfrm_policy_free(ctx);
6c5c8ca7 1968 }
6c5c8ca7 1969 if (xp == NULL)
ef41aaa0 1970 return -ENOENT;
03e1ad7b 1971
ea2dea9d 1972 if (unlikely(xp->walk.dead))
6c5c8ca7 1973 goto out;
6c5c8ca7 1974
6c5c8ca7
JHS		 1975 err = 0;
1976 if (up->hard) {
e1760bd5 1977 kuid_t loginuid = audit_get_loginuid(current);
4440e854 1978 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed
PM		 1979 u32 sid;
1980
1981 security_task_getsecid(current, &sid);
6c5c8ca7 1982 xfrm_policy_delete(xp, p->dir);
2532386f 1983 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
161a09e7 1984
6c5c8ca7
JHS		 1985 } else {
1986 // reset the timers here?
62db5cfd 1987 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7 1988 }
c6bb8136 1989 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
6c5c8ca7
JHS		 1990
1991out:
1992 xfrm_pol_put(xp);
1993 return err;
1994}
1995
22e70050 1996static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1997 struct nlattr **attrs)
53bc6b4d 1998{
fc34acd3 1999 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 2000 struct xfrm_state *x;
2001 int err;
7b67c857 2002 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 2003 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 2004 struct xfrm_mark m;
928497f0 2005 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 2006
6f26b61e 2007 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 2008
3a765aa5 2009 err = -ENOENT;
53bc6b4d
JHS		 2010 if (x == NULL)
2011 return err;
2012
53bc6b4d 2013 spin_lock_bh(&x->lock);
3a765aa5 2014 err = -EINVAL;
53bc6b4d
JHS		 2015 if (x->km.state != XFRM_STATE_VALID)
2016 goto out;
c6bb8136 2017 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
53bc6b4d 2018
161a09e7 2019 if (ue->hard) {
e1760bd5 2020 kuid_t loginuid = audit_get_loginuid(current);
4440e854 2021 unsigned int sessionid = audit_get_sessionid(current);
c53fa1ed
PM		 2022 u32 sid;
2023
2024 security_task_getsecid(current, &sid);
53bc6b4d 2025 __xfrm_state_delete(x);
2532386f 2026 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
161a09e7 2027 }
3a765aa5 2028 err = 0;
53bc6b4d
JHS		 2029out:
2030 spin_unlock_bh(&x->lock);
2031 xfrm_state_put(x);
2032 return err;
2033}
2034
22e70050 2035static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2036 struct nlattr **attrs)
980ebd25 2037{
fc34acd3 2038 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 2039 struct xfrm_policy *xp;
2040 struct xfrm_user_tmpl *ut;
2041 int i;
5424f32e 2042 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 2043 struct xfrm_mark mark;
980ebd25 2044
7b67c857 2045 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 2046 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 2047 int err = -ENOMEM;
2048
2049 if (!x)
d8eb9307 2050 goto nomem;
980ebd25 2051
6f26b61e
JHS		 2052 xfrm_mark_get(attrs, &mark);
2053
980ebd25 2054 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 2055 if (err)
2056 goto bad_policy;
980ebd25
JHS		 2057
2058 /* build an XP */
fc34acd3 2059 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2060 if (!xp)
2061 goto free_state;
980ebd25
JHS		 2062
2063 memcpy(&x->id, &ua->id, sizeof(ua->id));
2064 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2065 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2066 xp->mark.m = x->mark.m = mark.m;
2067 xp->mark.v = x->mark.v = mark.v;
5424f32e 2068 ut = nla_data(rt);
980ebd25
JHS		 2069 /* extract the templates and for each call km_key */
2070 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2071 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2072 memcpy(&x->id, &t->id, sizeof(x->id));
2073 x->props.mode = t->mode;
2074 x->props.reqid = t->reqid;
2075 x->props.family = ut->family;
2076 t->aalgos = ua->aalgos;
2077 t->ealgos = ua->ealgos;
2078 t->calgos = ua->calgos;
2079 err = km_query(x, t, xp);
2080
2081 }
2082
2083 kfree(x);
2084 kfree(xp);
2085
2086 return 0;
d8eb9307
IJ		 2087
2088bad_policy:
62db5cfd 2089 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2090free_state:
2091 kfree(x);
2092nomem:
2093 return err;
980ebd25
JHS		 2094}
2095
5c79de6e 2096#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2097static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2098 struct xfrm_kmaddress *k,
5424f32e 2099 struct nlattr **attrs, int *num)
5c79de6e 2100{
5424f32e 2101 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2102 struct xfrm_user_migrate *um;
2103 int i, num_migrate;
2104
13c1d189
AE		 2105 if (k != NULL) {
2106 struct xfrm_user_kmaddress *uk;
2107
2108 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2109 memcpy(&k->local, &uk->local, sizeof(k->local));
2110 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2111 k->family = uk->family;
2112 k->reserved = uk->reserved;
2113 }
2114
5424f32e
TG		 2115 um = nla_data(rt);
2116 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2117
2118 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2119 return -EINVAL;
2120
2121 for (i = 0; i < num_migrate; i++, um++, ma++) {
2122 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2123 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2124 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2125 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2126
2127 ma->proto = um->proto;
2128 ma->mode = um->mode;
2129 ma->reqid = um->reqid;
2130
2131 ma->old_family = um->old_family;
2132 ma->new_family = um->new_family;
2133 }
2134
2135 *num = i;
2136 return 0;
2137}
2138
2139static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2140 struct nlattr **attrs)
5c79de6e 2141{
7b67c857 2142 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2143 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2144 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2145 u8 type;
2146 int err;
2147 int n = 0;
8d549c4f 2148 struct net *net = sock_net(skb->sk);
5c79de6e 2149
35a7aa08 2150 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2151 return -EINVAL;
5c79de6e 2152
13c1d189
AE		 2153 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2154
5424f32e 2155 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2156 if (err)
2157 return err;
2158
13c1d189 2159 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2160 if (err)
2161 return err;
2162
2163 if (!n)
2164 return 0;
2165
8d549c4f 2166 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
5c79de6e
SS		 2167
2168 return 0;
2169}
2170#else
2171static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2172 struct nlattr **attrs)
5c79de6e
SS		 2173{
2174 return -ENOPROTOOPT;
2175}
2176#endif
2177
2178#ifdef CONFIG_XFRM_MIGRATE
183cad12 2179static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2180{
2181 struct xfrm_user_migrate um;
2182
2183 memset(&um, 0, sizeof(um));
2184 um.proto = m->proto;
2185 um.mode = m->mode;
2186 um.reqid = m->reqid;
2187 um.old_family = m->old_family;
2188 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2189 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2190 um.new_family = m->new_family;
2191 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2192 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2193
c0144bea 2194 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2195}
2196
183cad12 2197static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2198{
2199 struct xfrm_user_kmaddress uk;
2200
2201 memset(&uk, 0, sizeof(uk));
2202 uk.family = k->family;
2203 uk.reserved = k->reserved;
2204 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2205 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2206
2207 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2208}
2209
2210static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2211{
2212 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2213 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2214 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2215 + userpolicy_type_attrsize();
7deb2264
TG		 2216}
2217
183cad12
DM		 2218static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2219 int num_migrate, const struct xfrm_kmaddress *k,
2220 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2221{
183cad12 2222 const struct xfrm_migrate *mp;
5c79de6e
SS		 2223 struct xfrm_userpolicy_id *pol_id;
2224 struct nlmsghdr *nlh;
1d1e34dd 2225 int i, err;
5c79de6e 2226
79b8b7f4
TG		 2227 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2228 if (nlh == NULL)
2229 return -EMSGSIZE;
5c79de6e 2230
7b67c857 2231 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2232 /* copy data from selector, dir, and type to the pol_id */
2233 memset(pol_id, 0, sizeof(*pol_id));
2234 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2235 pol_id->dir = dir;
2236
1d1e34dd
DM		 2237 if (k != NULL) {
2238 err = copy_to_user_kmaddress(k, skb);
2239 if (err)
2240 goto out_cancel;
2241 }
2242 err = copy_to_user_policy_type(type, skb);
2243 if (err)
2244 goto out_cancel;
5c79de6e 2245 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2246 err = copy_to_user_migrate(mp, skb);
2247 if (err)
2248 goto out_cancel;
5c79de6e
SS		 2249 }
2250
9825069d 2251 return nlmsg_end(skb, nlh);
1d1e34dd
DM		 2252
2253out_cancel:
9825069d 2254 nlmsg_cancel(skb, nlh);
1d1e34dd 2255 return err;
5c79de6e
SS		 2256}
2257
183cad12
DM		 2258static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2259 const struct xfrm_migrate *m, int num_migrate,
2260 const struct xfrm_kmaddress *k)
5c79de6e 2261{
a6483b79 2262 struct net *net = &init_net;
5c79de6e 2263 struct sk_buff *skb;
5c79de6e 2264
13c1d189 2265 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2266 if (skb == NULL)
2267 return -ENOMEM;
2268
2269 /* build migrate */
13c1d189 2270 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2271 BUG();
2272
a6483b79 2273 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
5c79de6e
SS		 2274}
2275#else
183cad12
DM		 2276static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2277 const struct xfrm_migrate *m, int num_migrate,
2278 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2279{
2280 return -ENOPROTOOPT;
2281}
2282#endif
d51d081d 2283
a7bd9a45 2284#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2285
2286static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2287 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2288 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2289 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2290 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2291 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2292 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2293 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2294 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2295 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2296 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2297 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2298 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2299 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2300 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2301 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2302 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2303 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2304 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 2305 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2306 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2307};
2308
492b558b
TG		 2309#undef XMSGSIZE
2310
cf5cb79f 2311static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2312 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2313 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2314 [XFRMA_LASTUSED] = { .type = NLA_U64},
2315 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2316 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2317 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2318 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2319 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2320 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2321 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2322 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2323 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2324 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2325 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2326 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2327 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2328 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2329 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2330 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2331 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2332 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2333 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2334 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
a947b0a9 2335 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
d3623099 2336 [XFRMA_PROTO] = { .type = NLA_U8 },
870a2df4 2337 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
cf5cb79f
TG		 2338};
2339
05600a79 2340static const struct xfrm_link {
5424f32e 2341 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2342 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2343 int (*done)(struct netlink_callback *);
492b558b
TG		 2344} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2345 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2346 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2347 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2348 .dump = xfrm_dump_sa,
2349 .done = xfrm_dump_sa_done },
492b558b
TG		 2350 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2351 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2352 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2353 .dump = xfrm_dump_policy,
2354 .done = xfrm_dump_policy_done },
492b558b 2355 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2356 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2357 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2358 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2359 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2360 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2361 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2362 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2363 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2364 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2365 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2366 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 2367 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2368};
2369
1d00a4eb 2370static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2371{
a6483b79 2372 struct net *net = sock_net(skb->sk);
35a7aa08 2373 struct nlattr *attrs[XFRMA_MAX+1];
05600a79 2374 const struct xfrm_link *link;
a7bd9a45 2375 int type, err;
1da177e4 2376
1da177e4 2377 type = nlh->nlmsg_type;
1da177e4 2378 if (type > XFRM_MSG_MAX)
1d00a4eb 2379 return -EINVAL;
1da177e4
LT		 2380
2381 type -= XFRM_MSG_BASE;
2382 link = &xfrm_dispatch[type];
2383
2384 /* All operations require privileges, even GET */
df008c91 2385 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1d00a4eb 2386 return -EPERM;
1da177e4 2387
492b558b
TG		 2388 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2389 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2390 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2391 if (link->dump == NULL)
1d00a4eb 2392 return -EINVAL;
88fc2c84 2393
80d326fa
PNA		 2394 {
2395 struct netlink_dump_control c = {
2396 .dump = link->dump,
2397 .done = link->done,
2398 };
2399 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2400 }
1da177e4
LT		 2401 }
2402
35a7aa08 2403 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 2404 xfrma_policy);
a7bd9a45
TG		 2405 if (err < 0)
2406 return err;
1da177e4
LT		 2407
2408 if (link->doit == NULL)
1d00a4eb 2409 return -EINVAL;
1da177e4 2410
5424f32e 2411 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2412}
2413
cd40b7d3 2414static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2415{
283bc9f3
FD		 2416 struct net *net = sock_net(skb->sk);
2417
2418 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
cd40b7d3 2419 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
283bc9f3 2420 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
1da177e4
LT		 2421}
2422
7deb2264
TG		 2423static inline size_t xfrm_expire_msgsize(void)
2424{
6f26b61e
JHS		 2425 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2426 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2427}
2428
214e005b 2429static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2430{
2431 struct xfrm_user_expire *ue;
2432 struct nlmsghdr *nlh;
1d1e34dd 2433 int err;
1da177e4 2434
15e47304 2435 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
79b8b7f4
TG		 2436 if (nlh == NULL)
2437 return -EMSGSIZE;
1da177e4 2438
7b67c857 2439 ue = nlmsg_data(nlh);
1da177e4 2440 copy_to_user_state(x, &ue->state);
d51d081d 2441 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2442
1d1e34dd
DM		 2443 err = xfrm_mark_put(skb, &x->mark);
2444 if (err)
2445 return err;
6f26b61e 2446
9825069d 2447 return nlmsg_end(skb, nlh);
1da177e4
LT		 2448}
2449
214e005b 2450static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2451{
fc34acd3 2452 struct net *net = xs_net(x);
1da177e4
LT		 2453 struct sk_buff *skb;
2454
7deb2264 2455 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2456 if (skb == NULL)
2457 return -ENOMEM;
2458
6f26b61e
JHS		 2459 if (build_expire(skb, x, c) < 0) {
2460 kfree_skb(skb);
2461 return -EMSGSIZE;
2462 }
1da177e4 2463
a6483b79 2464 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2465}
2466
214e005b 2467static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2468{
fc34acd3 2469 struct net *net = xs_net(x);
d51d081d 2470 struct sk_buff *skb;
d51d081d 2471
d8647b79 2472 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2473 if (skb == NULL)
2474 return -ENOMEM;
2475
2476 if (build_aevent(skb, x, c) < 0)
2477 BUG();
2478
a6483b79 2479 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
d51d081d
JHS		 2480}
2481
214e005b 2482static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2483{
7067802e 2484 struct net *net = c->net;
26b15dad
JHS		 2485 struct xfrm_usersa_flush *p;
2486 struct nlmsghdr *nlh;
2487 struct sk_buff *skb;
7deb2264 2488 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2489
7deb2264 2490 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2491 if (skb == NULL)
2492 return -ENOMEM;
26b15dad 2493
15e47304 2494 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
79b8b7f4
TG		 2495 if (nlh == NULL) {
2496 kfree_skb(skb);
2497 return -EMSGSIZE;
2498 }
26b15dad 2499
7b67c857 2500 p = nlmsg_data(nlh);
bf08867f 2501 p->proto = c->data.proto;
26b15dad 2502
9825069d 2503 nlmsg_end(skb, nlh);
26b15dad 2504
a6483b79 2505 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2506}
2507
7deb2264 2508static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2509{
7deb2264 2510 size_t l = 0;
1a6509d9
HX		 2511 if (x->aead)
2512 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2513 if (x->aalg) {
2514 l += nla_total_size(sizeof(struct xfrm_algo) +
2515 (x->aalg->alg_key_len + 7) / 8);
2516 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2517 }
26b15dad 2518 if (x->ealg)
0f99be0d 2519 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2520 if (x->calg)
7deb2264 2521 l += nla_total_size(sizeof(*x->calg));
26b15dad 2522 if (x->encap)
7deb2264 2523 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2524 if (x->tfcpad)
2525 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2526 if (x->replay_esn)
2527 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
68325d3b
HX		 2528 if (x->security)
2529 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2530 x->security->ctx_len);
2531 if (x->coaddr)
2532 l += nla_total_size(sizeof(*x->coaddr));
a947b0a9
ND		 2533 if (x->props.extra_flags)
2534 l += nla_total_size(sizeof(x->props.extra_flags));
68325d3b 2535
d26f3984
HX		 2536 /* Must count x->lastused as it may become non-zero behind our back. */
2537 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2538
2539 return l;
2540}
2541
214e005b 2542static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2543{
fc34acd3 2544 struct net *net = xs_net(x);
26b15dad 2545 struct xfrm_usersa_info *p;
0603eac0 2546 struct xfrm_usersa_id *id;
26b15dad
JHS		 2547 struct nlmsghdr *nlh;
2548 struct sk_buff *skb;
26b15dad 2549 int len = xfrm_sa_len(x);
1d1e34dd 2550 int headlen, err;
0603eac0
HX		 2551
2552 headlen = sizeof(*p);
2553 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2554 len += nla_total_size(headlen);
0603eac0 2555 headlen = sizeof(*id);
6f26b61e 2556 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2557 }
7deb2264 2558 len += NLMSG_ALIGN(headlen);
26b15dad 2559
7deb2264 2560 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2561 if (skb == NULL)
2562 return -ENOMEM;
26b15dad 2563
15e47304 2564 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2565 err = -EMSGSIZE;
79b8b7f4 2566 if (nlh == NULL)
1d1e34dd 2567 goto out_free_skb;
26b15dad 2568
7b67c857 2569 p = nlmsg_data(nlh);
0603eac0 2570 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2571 struct nlattr *attr;
2572
7b67c857 2573 id = nlmsg_data(nlh);
0603eac0
HX		 2574 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2575 id->spi = x->id.spi;
2576 id->family = x->props.family;
2577 id->proto = x->id.proto;
2578
c0144bea 2579 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2580 err = -EMSGSIZE;
c0144bea 2581 if (attr == NULL)
1d1e34dd 2582 goto out_free_skb;
c0144bea
TG		 2583
2584 p = nla_data(attr);
0603eac0 2585 }
1d1e34dd
DM		 2586 err = copy_to_user_state_extra(x, p, skb);
2587 if (err)
2588 goto out_free_skb;
26b15dad 2589
9825069d 2590 nlmsg_end(skb, nlh);
26b15dad 2591
a6483b79 2592 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad 2593
1d1e34dd 2594out_free_skb:
26b15dad 2595 kfree_skb(skb);
1d1e34dd 2596 return err;
26b15dad
JHS		 2597}
2598
214e005b 2599static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2600{
2601
2602 switch (c->event) {
f60f6b8f 2603 case XFRM_MSG_EXPIRE:
26b15dad 2604 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2605 case XFRM_MSG_NEWAE:
2606 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2607 case XFRM_MSG_DELSA:
2608 case XFRM_MSG_UPDSA:
2609 case XFRM_MSG_NEWSA:
26b15dad 2610 return xfrm_notify_sa(x, c);
f60f6b8f 2611 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2612 return xfrm_notify_sa_flush(c);
2613 default:
62db5cfd 2614 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2615 c->event);
2616 break;
26b15dad
JHS		 2617 }
2618
2619 return 0;
2620
2621}
2622
7deb2264
TG		 2623static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2624 struct xfrm_policy *xp)
2625{
2626 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2627 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2628 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2629 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2630 + userpolicy_type_attrsize();
2631}
2632
1da177e4 2633static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
65e0736b 2634 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
1da177e4 2635{
1d1e34dd 2636 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2637 struct xfrm_user_acquire *ua;
2638 struct nlmsghdr *nlh;
1d1e34dd 2639 int err;
1da177e4 2640
79b8b7f4
TG		 2641 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2642 if (nlh == NULL)
2643 return -EMSGSIZE;
1da177e4 2644
7b67c857 2645 ua = nlmsg_data(nlh);
1da177e4
LT		 2646 memcpy(&ua->id, &x->id, sizeof(ua->id));
2647 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2648 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
65e0736b 2649 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
1da177e4
LT		 2650 ua->aalgos = xt->aalgos;
2651 ua->ealgos = xt->ealgos;
2652 ua->calgos = xt->calgos;
2653 ua->seq = x->km.seq = seq;
2654
1d1e34dd
DM		 2655 err = copy_to_user_tmpl(xp, skb);
2656 if (!err)
2657 err = copy_to_user_state_sec_ctx(x, skb);
2658 if (!err)
2659 err = copy_to_user_policy_type(xp->type, skb);
2660 if (!err)
2661 err = xfrm_mark_put(skb, &xp->mark);
2662 if (err) {
2663 nlmsg_cancel(skb, nlh);
2664 return err;
2665 }
1da177e4 2666
9825069d 2667 return nlmsg_end(skb, nlh);
1da177e4
LT		 2668}
2669
2670static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
65e0736b 2671 struct xfrm_policy *xp)
1da177e4 2672{
a6483b79 2673 struct net *net = xs_net(x);
1da177e4 2674 struct sk_buff *skb;
1da177e4 2675
7deb2264 2676 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2677 if (skb == NULL)
2678 return -ENOMEM;
2679
65e0736b 2680 if (build_acquire(skb, x, xt, xp) < 0)
1da177e4
LT		 2681 BUG();
2682
a6483b79 2683 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2684}
2685
2686/* User gives us xfrm_user_policy_info followed by an array of 0
2687 * or more templates.
2688 */
cb969f07 2689static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2690 u8 *data, int len, int *dir)
2691{
fc34acd3 2692 struct net *net = sock_net(sk);
1da177e4
LT		 2693 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2694 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2695 struct xfrm_policy *xp;
2696 int nr;
2697
cb969f07 2698 switch (sk->sk_family) {
1da177e4
LT		 2699 case AF_INET:
2700 if (opt != IP_XFRM_POLICY) {
2701 *dir = -EOPNOTSUPP;
2702 return NULL;
2703 }
2704 break;
dfd56b8b 2705#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2706 case AF_INET6:
2707 if (opt != IPV6_XFRM_POLICY) {
2708 *dir = -EOPNOTSUPP;
2709 return NULL;
2710 }
2711 break;
2712#endif
2713 default:
2714 *dir = -EINVAL;
2715 return NULL;
2716 }
2717
2718 *dir = -EINVAL;
2719
2720 if (len < sizeof(*p) ||
2721 verify_newpolicy_info(p))
2722 return NULL;
2723
2724 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2725 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2726 return NULL;
2727
a4f1bac6
HX		 2728 if (p->dir > XFRM_POLICY_OUT)
2729 return NULL;
2730
2f09a4d5 2731 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2732 if (xp == NULL) {
2733 *dir = -ENOBUFS;
2734 return NULL;
2735 }
2736
2737 copy_from_user_policy(xp, p);
f7b6983f 2738 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2739 copy_templates(xp, ut, nr);
2740
2741 *dir = p->dir;
2742
2743 return xp;
2744}
2745
7deb2264
TG		 2746static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2747{
2748 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2749 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2750 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2751 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2752 + userpolicy_type_attrsize();
2753}
2754
1da177e4 2755static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2756 int dir, const struct km_event *c)
1da177e4
LT		 2757{
2758 struct xfrm_user_polexpire *upe;
d51d081d 2759 int hard = c->data.hard;
1d1e34dd
DM		 2760 struct nlmsghdr *nlh;
2761 int err;
1da177e4 2762
15e47304 2763 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
79b8b7f4
TG		 2764 if (nlh == NULL)
2765 return -EMSGSIZE;
1da177e4 2766
7b67c857 2767 upe = nlmsg_data(nlh);
1da177e4 2768 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2769 err = copy_to_user_tmpl(xp, skb);
2770 if (!err)
2771 err = copy_to_user_sec_ctx(xp, skb);
2772 if (!err)
2773 err = copy_to_user_policy_type(xp->type, skb);
2774 if (!err)
2775 err = xfrm_mark_put(skb, &xp->mark);
2776 if (err) {
2777 nlmsg_cancel(skb, nlh);
2778 return err;
2779 }
1da177e4
LT		 2780 upe->hard = !!hard;
2781
9825069d 2782 return nlmsg_end(skb, nlh);
1da177e4
LT		 2783}
2784
214e005b 2785static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2786{
fc34acd3 2787 struct net *net = xp_net(xp);
1da177e4 2788 struct sk_buff *skb;
1da177e4 2789
7deb2264 2790 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2791 if (skb == NULL)
2792 return -ENOMEM;
2793
d51d081d 2794 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2795 BUG();
2796
a6483b79 2797 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2798}
2799
214e005b 2800static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2801{
1d1e34dd 2802 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2803 struct net *net = xp_net(xp);
26b15dad 2804 struct xfrm_userpolicy_info *p;
0603eac0 2805 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2806 struct nlmsghdr *nlh;
2807 struct sk_buff *skb;
1d1e34dd 2808 int headlen, err;
0603eac0
HX		 2809
2810 headlen = sizeof(*p);
2811 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2812 len += nla_total_size(headlen);
0603eac0
HX		 2813 headlen = sizeof(*id);
2814 }
cfbfd45a 2815 len += userpolicy_type_attrsize();
295fae56 2816 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2817 len += NLMSG_ALIGN(headlen);
26b15dad 2818
7deb2264 2819 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2820 if (skb == NULL)
2821 return -ENOMEM;
26b15dad 2822
15e47304 2823 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2824 err = -EMSGSIZE;
79b8b7f4 2825 if (nlh == NULL)
1d1e34dd 2826 goto out_free_skb;
26b15dad 2827
7b67c857 2828 p = nlmsg_data(nlh);
0603eac0 2829 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2830 struct nlattr *attr;
2831
7b67c857 2832 id = nlmsg_data(nlh);
0603eac0
HX		 2833 memset(id, 0, sizeof(*id));
2834 id->dir = dir;
2835 if (c->data.byid)
2836 id->index = xp->index;
2837 else
2838 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2839
c0144bea 2840 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2841 err = -EMSGSIZE;
c0144bea 2842 if (attr == NULL)
1d1e34dd 2843 goto out_free_skb;
c0144bea
TG		 2844
2845 p = nla_data(attr);
0603eac0 2846 }
26b15dad 2847
26b15dad 2848 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2849 err = copy_to_user_tmpl(xp, skb);
2850 if (!err)
2851 err = copy_to_user_policy_type(xp->type, skb);
2852 if (!err)
2853 err = xfrm_mark_put(skb, &xp->mark);
2854 if (err)
2855 goto out_free_skb;
295fae56 2856
9825069d 2857 nlmsg_end(skb, nlh);
26b15dad 2858
a6483b79 2859 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2860
1d1e34dd 2861out_free_skb:
26b15dad 2862 kfree_skb(skb);
1d1e34dd 2863 return err;
26b15dad
JHS		 2864}
2865
214e005b 2866static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2867{
7067802e 2868 struct net *net = c->net;
26b15dad
JHS		 2869 struct nlmsghdr *nlh;
2870 struct sk_buff *skb;
1d1e34dd 2871 int err;
26b15dad 2872
7deb2264 2873 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2874 if (skb == NULL)
2875 return -ENOMEM;
26b15dad 2876
15e47304 2877 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2878 err = -EMSGSIZE;
79b8b7f4 2879 if (nlh == NULL)
1d1e34dd
DM		 2880 goto out_free_skb;
2881 err = copy_to_user_policy_type(c->data.type, skb);
2882 if (err)
2883 goto out_free_skb;
26b15dad 2884
9825069d 2885 nlmsg_end(skb, nlh);
26b15dad 2886
a6483b79 2887 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2888
1d1e34dd 2889out_free_skb:
26b15dad 2890 kfree_skb(skb);
1d1e34dd 2891 return err;
26b15dad
JHS		 2892}
2893
214e005b 2894static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2895{
2896
2897 switch (c->event) {
f60f6b8f
HX		 2898 case XFRM_MSG_NEWPOLICY:
2899 case XFRM_MSG_UPDPOLICY:
2900 case XFRM_MSG_DELPOLICY:
26b15dad 2901 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2902 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2903 return xfrm_notify_policy_flush(c);
f60f6b8f 2904 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2905 return xfrm_exp_policy_notify(xp, dir, c);
2906 default:
62db5cfd 2907 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2908 c->event);
26b15dad
JHS		 2909 }
2910
2911 return 0;
2912
2913}
2914
7deb2264
TG		 2915static inline size_t xfrm_report_msgsize(void)
2916{
2917 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2918}
2919
97a64b45
MN		 2920static int build_report(struct sk_buff *skb, u8 proto,
2921 struct xfrm_selector *sel, xfrm_address_t *addr)
2922{
2923 struct xfrm_user_report *ur;
2924 struct nlmsghdr *nlh;
97a64b45 2925
79b8b7f4
TG		 2926 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2927 if (nlh == NULL)
2928 return -EMSGSIZE;
97a64b45 2929
7b67c857 2930 ur = nlmsg_data(nlh);
97a64b45
MN		 2931 ur->proto = proto;
2932 memcpy(&ur->sel, sel, sizeof(ur->sel));
2933
1d1e34dd
DM		 2934 if (addr) {
2935 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2936 if (err) {
2937 nlmsg_cancel(skb, nlh);
2938 return err;
2939 }
2940 }
9825069d 2941 return nlmsg_end(skb, nlh);
97a64b45
MN		 2942}
2943
db983c11
AD		 2944static int xfrm_send_report(struct net *net, u8 proto,
2945 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2946{
2947 struct sk_buff *skb;
97a64b45 2948
7deb2264 2949 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2950 if (skb == NULL)
2951 return -ENOMEM;
2952
2953 if (build_report(skb, proto, sel, addr) < 0)
2954 BUG();
2955
a6483b79 2956 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
97a64b45
MN		 2957}
2958
3a2dfbe8
MW		 2959static inline size_t xfrm_mapping_msgsize(void)
2960{
2961 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2962}
2963
2964static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2965 xfrm_address_t *new_saddr, __be16 new_sport)
2966{
2967 struct xfrm_user_mapping *um;
2968 struct nlmsghdr *nlh;
2969
2970 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2971 if (nlh == NULL)
2972 return -EMSGSIZE;
2973
2974 um = nlmsg_data(nlh);
2975
2976 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2977 um->id.spi = x->id.spi;
2978 um->id.family = x->props.family;
2979 um->id.proto = x->id.proto;
2980 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2981 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2982 um->new_sport = new_sport;
2983 um->old_sport = x->encap->encap_sport;
2984 um->reqid = x->props.reqid;
2985
2986 return nlmsg_end(skb, nlh);
2987}
2988
2989static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2990 __be16 sport)
2991{
a6483b79 2992 struct net *net = xs_net(x);
3a2dfbe8
MW		 2993 struct sk_buff *skb;
2994
2995 if (x->id.proto != IPPROTO_ESP)
2996 return -EINVAL;
2997
2998 if (!x->encap)
2999 return -EINVAL;
3000
3001 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3002 if (skb == NULL)
3003 return -ENOMEM;
3004
3005 if (build_mapping(skb, x, ipaddr, sport) < 0)
3006 BUG();
3007
a6483b79 3008 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
3a2dfbe8
MW		 3009}
3010
0f24558e
HG		 3011static bool xfrm_is_alive(const struct km_event *c)
3012{
3013 return (bool)xfrm_acquire_is_on(c->net);
3014}
3015
1da177e4
LT		 3016static struct xfrm_mgr netlink_mgr = {
3017 .id = "netlink",
3018 .notify = xfrm_send_state_notify,
3019 .acquire = xfrm_send_acquire,
3020 .compile_policy = xfrm_compile_policy,
3021 .notify_policy = xfrm_send_policy_notify,
97a64b45 3022 .report = xfrm_send_report,
5c79de6e 3023 .migrate = xfrm_send_migrate,
3a2dfbe8 3024 .new_mapping = xfrm_send_mapping,
0f24558e 3025 .is_alive = xfrm_is_alive,
1da177e4
LT		 3026};
3027
a6483b79 3028static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 3029{
be33690d 3030 struct sock *nlsk;
a31f2d17
PNA		 3031 struct netlink_kernel_cfg cfg = {
3032 .groups = XFRMNLGRP_MAX,
3033 .input = xfrm_netlink_rcv,
3034 };
be33690d 3035
9f00d977 3036 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
be33690d 3037 if (nlsk == NULL)
1da177e4 3038 return -ENOMEM;
d79d792e 3039 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 3040 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 3041 return 0;
3042}
3043
d79d792e 3044static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 3045{
d79d792e
EB		 3046 struct net *net;
3047 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 3048 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 3049 synchronize_net();
3050 list_for_each_entry(net, net_exit_list, exit_list)
3051 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 3052}
3053
a6483b79 3054static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 3055 .init = xfrm_user_net_init,
3056 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 3057};
3058
3059static int __init xfrm_user_init(void)
3060{
3061 int rv;
3062
3063 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3064
3065 rv = register_pernet_subsys(&xfrm_user_net_ops);
3066 if (rv < 0)
3067 return rv;
3068 rv = xfrm_register_km(&netlink_mgr);
3069 if (rv < 0)
3070 unregister_pernet_subsys(&xfrm_user_net_ops);
3071 return rv;
3072}
3073
3074static void __exit xfrm_user_exit(void)
3075{
3076 xfrm_unregister_km(&netlink_mgr);
3077 unregister_pernet_subsys(&xfrm_user_net_ops);
3078}
3079
1da177e4
LT		 3080module_init(xfrm_user_init);
3081module_exit(xfrm_user_exit);
3082MODULE_LICENSE("GPL");
4fdb3bb7 3083MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3084
Linux kernel - Deliverables
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