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xfrm_user: ensure user supplied esn replay window is valid
[mirror_ubuntu-focal-kernel.git] / net / xfrm / xfrm_user.c
CommitLineData
1da177e4
LT		 1/* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
df71837d 10 *
1da177e4
LT		 11 */
12
9409f38a 13#include <linux/crypto.h>
1da177e4
LT		 14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/net.h>
21#include <linux/skbuff.h>
1da177e4
LT		 22#include <linux/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
88fc2c84 28#include <net/netlink.h>
fa6dd8a2 29#include <net/ah.h>
1da177e4 30#include <asm/uaccess.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 32#include <linux/in6.h>
33#endif
1da177e4 34
1a6509d9
HX		 35static inline int aead_len(struct xfrm_algo_aead *alg)
36{
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38}
39
5424f32e 40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 41{
5424f32e 42 struct nlattr *rt = attrs[type];
1da177e4
LT		 43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
5424f32e 48 algp = nla_data(rt);
0f99be0d 49 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 50 return -EINVAL;
51
1da177e4
LT		 52 switch (type) {
53 case XFRMA_ALG_AUTH:
1da177e4 54 case XFRMA_ALG_CRYPT:
1da177e4 55 case XFRMA_ALG_COMP:
1da177e4
LT		 56 break;
57
58 default:
59 return -EINVAL;
3ff50b79 60 }
1da177e4
LT		 61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64}
65
4447bb33
MW		 66static int verify_auth_trunc(struct nlattr **attrs)
67{
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80}
81
1a6509d9
HX		 82static int verify_aead(struct nlattr **attrs)
83{
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96}
97
5424f32e 98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 99 xfrm_address_t **addrp)
100{
5424f32e 101 struct nlattr *rt = attrs[type];
eb2971b6 102
cf5cb79f 103 if (rt && addrp)
5424f32e 104 *addrp = nla_data(rt);
eb2971b6 105}
df71837d 106
5424f32e 107static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 108{
5424f32e 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 110 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 111
112 if (!rt)
113 return 0;
114
5424f32e 115 uctx = nla_data(rt);
cf5cb79f 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 117 return -EINVAL;
118
119 return 0;
120}
121
d8647b79
SK		 122static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124{
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
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
02aadf72
SK		 145 if (p->id.proto != IPPROTO_ESP)
146 return -EINVAL;
147
d8647b79
SK		 148 if (p->replay_window != 0)
149 return -EINVAL;
150
151 return 0;
152}
df71837d 153
1da177e4 154static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 155 struct nlattr **attrs)
1da177e4
LT		 156{
157 int err;
158
159 err = -EINVAL;
160 switch (p->family) {
161 case AF_INET:
162 break;
163
164 case AF_INET6:
dfd56b8b 165#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 166 break;
167#else
168 err = -EAFNOSUPPORT;
169 goto out;
170#endif
171
172 default:
173 goto out;
3ff50b79 174 }
1da177e4
LT		 175
176 err = -EINVAL;
177 switch (p->id.proto) {
178 case IPPROTO_AH:
4447bb33
MW		 179 if ((!attrs[XFRMA_ALG_AUTH] &&
180 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 181 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 182 attrs[XFRMA_ALG_CRYPT] ||
35d2856b
MW		 183 attrs[XFRMA_ALG_COMP] ||
184 attrs[XFRMA_TFCPAD])
1da177e4
LT		 185 goto out;
186 break;
187
188 case IPPROTO_ESP:
1a6509d9
HX		 189 if (attrs[XFRMA_ALG_COMP])
190 goto out;
191 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 192 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 193 !attrs[XFRMA_ALG_CRYPT] &&
194 !attrs[XFRMA_ALG_AEAD])
195 goto out;
196 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 197 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 198 attrs[XFRMA_ALG_CRYPT]) &&
199 attrs[XFRMA_ALG_AEAD])
1da177e4 200 goto out;
35d2856b
MW		 201 if (attrs[XFRMA_TFCPAD] &&
202 p->mode != XFRM_MODE_TUNNEL)
203 goto out;
1da177e4
LT		 204 break;
205
206 case IPPROTO_COMP:
35a7aa08 207 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 208 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 209 attrs[XFRMA_ALG_AUTH] ||
4447bb33 210 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b
MW		 211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_TFCPAD])
1da177e4
LT		 213 goto out;
214 break;
215
dfd56b8b 216#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 217 case IPPROTO_DSTOPTS:
218 case IPPROTO_ROUTING:
35a7aa08
TG		 219 if (attrs[XFRMA_ALG_COMP] ||
220 attrs[XFRMA_ALG_AUTH] ||
4447bb33 221 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9 222 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 223 attrs[XFRMA_ALG_CRYPT] ||
224 attrs[XFRMA_ENCAP] ||
225 attrs[XFRMA_SEC_CTX] ||
35d2856b 226 attrs[XFRMA_TFCPAD] ||
35a7aa08 227 !attrs[XFRMA_COADDR])
e23c7194
MN		 228 goto out;
229 break;
230#endif
231
1da177e4
LT		 232 default:
233 goto out;
3ff50b79 234 }
1da177e4 235
1a6509d9
HX		 236 if ((err = verify_aead(attrs)))
237 goto out;
4447bb33
MW		 238 if ((err = verify_auth_trunc(attrs)))
239 goto out;
35a7aa08 240 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 241 goto out;
35a7aa08 242 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 243 goto out;
35a7aa08 244 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 245 goto out;
35a7aa08 246 if ((err = verify_sec_ctx_len(attrs)))
df71837d 247 goto out;
d8647b79
SK		 248 if ((err = verify_replay(p, attrs)))
249 goto out;
1da177e4
LT		 250
251 err = -EINVAL;
252 switch (p->mode) {
7e49e6de
MN		 253 case XFRM_MODE_TRANSPORT:
254 case XFRM_MODE_TUNNEL:
060f02a3 255 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 256 case XFRM_MODE_BEET:
1da177e4
LT		 257 break;
258
259 default:
260 goto out;
3ff50b79 261 }
1da177e4
LT		 262
263 err = 0;
264
265out:
266 return err;
267}
268
269static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
6f2f19ed 270 struct xfrm_algo_desc *(*get_byname)(const char *, int),
5424f32e 271 struct nlattr *rta)
1da177e4 272{
1da177e4
LT		 273 struct xfrm_algo *p, *ualg;
274 struct xfrm_algo_desc *algo;
275
276 if (!rta)
277 return 0;
278
5424f32e 279 ualg = nla_data(rta);
1da177e4
LT		 280
281 algo = get_byname(ualg->alg_name, 1);
282 if (!algo)
283 return -ENOSYS;
284 *props = algo->desc.sadb_alg_id;
285
0f99be0d 286 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 287 if (!p)
288 return -ENOMEM;
289
04ff1260 290 strcpy(p->alg_name, algo->name);
1da177e4
LT		 291 *algpp = p;
292 return 0;
293}
294
4447bb33
MW		 295static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
296 struct nlattr *rta)
297{
298 struct xfrm_algo *ualg;
299 struct xfrm_algo_auth *p;
300 struct xfrm_algo_desc *algo;
301
302 if (!rta)
303 return 0;
304
305 ualg = nla_data(rta);
306
307 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
308 if (!algo)
309 return -ENOSYS;
310 *props = algo->desc.sadb_alg_id;
311
312 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
313 if (!p)
314 return -ENOMEM;
315
316 strcpy(p->alg_name, algo->name);
317 p->alg_key_len = ualg->alg_key_len;
318 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
319 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
320
321 *algpp = p;
322 return 0;
323}
324
325static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
326 struct nlattr *rta)
327{
328 struct xfrm_algo_auth *p, *ualg;
329 struct xfrm_algo_desc *algo;
330
331 if (!rta)
332 return 0;
333
334 ualg = nla_data(rta);
335
336 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
337 if (!algo)
338 return -ENOSYS;
fa6dd8a2
ND		 339 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
340 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 341 return -EINVAL;
342 *props = algo->desc.sadb_alg_id;
343
344 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
345 if (!p)
346 return -ENOMEM;
347
348 strcpy(p->alg_name, algo->name);
349 if (!p->alg_trunc_len)
350 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
351
352 *algpp = p;
353 return 0;
354}
355
1a6509d9
HX		 356static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
357 struct nlattr *rta)
358{
359 struct xfrm_algo_aead *p, *ualg;
360 struct xfrm_algo_desc *algo;
361
362 if (!rta)
363 return 0;
364
365 ualg = nla_data(rta);
366
367 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
368 if (!algo)
369 return -ENOSYS;
370 *props = algo->desc.sadb_alg_id;
371
372 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
373 if (!p)
374 return -ENOMEM;
375
376 strcpy(p->alg_name, algo->name);
377 *algpp = p;
378 return 0;
379}
380
e2b19125
SK		 381static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
382 struct nlattr *rp)
383{
384 struct xfrm_replay_state_esn *up;
ecd79187 385 int ulen;
e2b19125
SK		 386
387 if (!replay_esn || !rp)
388 return 0;
389
390 up = nla_data(rp);
ecd79187 391 ulen = xfrm_replay_state_esn_len(up);
e2b19125 392
ecd79187 393 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
e2b19125
SK		 394 return -EINVAL;
395
396 return 0;
397}
398
d8647b79
SK		 399static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
400 struct xfrm_replay_state_esn **preplay_esn,
401 struct nlattr *rta)
402{
403 struct xfrm_replay_state_esn *p, *pp, *up;
ecd79187 404 int klen, ulen;
d8647b79
SK		 405
406 if (!rta)
407 return 0;
408
409 up = nla_data(rta);
ecd79187
MK		 410 klen = xfrm_replay_state_esn_len(up);
411 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
d8647b79 412
ecd79187 413 p = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 414 if (!p)
415 return -ENOMEM;
416
ecd79187 417 pp = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 418 if (!pp) {
419 kfree(p);
420 return -ENOMEM;
421 }
422
ecd79187
MK		 423 memcpy(p, up, ulen);
424 memcpy(pp, up, ulen);
425
d8647b79
SK		 426 *replay_esn = p;
427 *preplay_esn = pp;
428
429 return 0;
430}
431
661697f7 432static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 433{
df71837d
TJ		 434 int len = 0;
435
436 if (xfrm_ctx) {
437 len += sizeof(struct xfrm_user_sec_ctx);
438 len += xfrm_ctx->ctx_len;
439 }
440 return len;
441}
442
1da177e4
LT		 443static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
444{
445 memcpy(&x->id, &p->id, sizeof(x->id));
446 memcpy(&x->sel, &p->sel, sizeof(x->sel));
447 memcpy(&x->lft, &p->lft, sizeof(x->lft));
448 x->props.mode = p->mode;
449 x->props.replay_window = p->replay_window;
450 x->props.reqid = p->reqid;
451 x->props.family = p->family;
54489c14 452 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 453 x->props.flags = p->flags;
196b0036 454
ccf9b3b8 455 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 456 x->sel.family = p->family;
1da177e4
LT		 457}
458
d51d081d
JHS		 459/*
460 * someday when pfkey also has support, we could have the code
461 * somehow made shareable and move it to xfrm_state.c - JHS
462 *
463*/
5424f32e 464static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
d51d081d 465{
5424f32e 466 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 467 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e
TG		 468 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
469 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
470 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 471
d8647b79
SK		 472 if (re) {
473 struct xfrm_replay_state_esn *replay_esn;
474 replay_esn = nla_data(re);
475 memcpy(x->replay_esn, replay_esn,
476 xfrm_replay_state_esn_len(replay_esn));
477 memcpy(x->preplay_esn, replay_esn,
478 xfrm_replay_state_esn_len(replay_esn));
479 }
480
d51d081d
JHS		 481 if (rp) {
482 struct xfrm_replay_state *replay;
5424f32e 483 replay = nla_data(rp);
d51d081d
JHS		 484 memcpy(&x->replay, replay, sizeof(*replay));
485 memcpy(&x->preplay, replay, sizeof(*replay));
486 }
487
488 if (lt) {
489 struct xfrm_lifetime_cur *ltime;
5424f32e 490 ltime = nla_data(lt);
d51d081d
JHS		 491 x->curlft.bytes = ltime->bytes;
492 x->curlft.packets = ltime->packets;
493 x->curlft.add_time = ltime->add_time;
494 x->curlft.use_time = ltime->use_time;
495 }
496
cf5cb79f 497 if (et)
5424f32e 498 x->replay_maxage = nla_get_u32(et);
d51d081d 499
cf5cb79f 500 if (rt)
5424f32e 501 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 502}
503
fc34acd3
AD		 504static struct xfrm_state *xfrm_state_construct(struct net *net,
505 struct xfrm_usersa_info *p,
5424f32e 506 struct nlattr **attrs,
1da177e4
LT		 507 int *errp)
508{
fc34acd3 509 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 510 int err = -ENOMEM;
511
512 if (!x)
513 goto error_no_put;
514
515 copy_from_user_state(x, p);
516
1a6509d9
HX		 517 if ((err = attach_aead(&x->aead, &x->props.ealgo,
518 attrs[XFRMA_ALG_AEAD])))
519 goto error;
4447bb33
MW		 520 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
521 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 522 goto error;
4447bb33
MW		 523 if (!x->props.aalgo) {
524 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
525 attrs[XFRMA_ALG_AUTH])))
526 goto error;
527 }
1da177e4
LT		 528 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
529 xfrm_ealg_get_byname,
35a7aa08 530 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 531 goto error;
532 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
533 xfrm_calg_get_byname,
35a7aa08 534 attrs[XFRMA_ALG_COMP])))
1da177e4 535 goto error;
fd21150a
TG		 536
537 if (attrs[XFRMA_ENCAP]) {
538 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
539 sizeof(*x->encap), GFP_KERNEL);
540 if (x->encap == NULL)
541 goto error;
542 }
543
35d2856b
MW		 544 if (attrs[XFRMA_TFCPAD])
545 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
546
fd21150a
TG		 547 if (attrs[XFRMA_COADDR]) {
548 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
549 sizeof(*x->coaddr), GFP_KERNEL);
550 if (x->coaddr == NULL)
551 goto error;
552 }
553
6f26b61e
JHS		 554 xfrm_mark_get(attrs, &x->mark);
555
a454f0cc 556 err = __xfrm_init_state(x, false);
1da177e4
LT		 557 if (err)
558 goto error;
559
fd21150a
TG		 560 if (attrs[XFRMA_SEC_CTX] &&
561 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 562 goto error;
563
d8647b79
SK		 564 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
565 attrs[XFRMA_REPLAY_ESN_VAL])))
566 goto error;
567
1da177e4 568 x->km.seq = p->seq;
b27aeadb 569 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 570 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 571 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 572
9fdc4883
SK		 573 if ((err = xfrm_init_replay(x)))
574 goto error;
d51d081d 575
9fdc4883 576 /* override default values from above */
5424f32e 577 xfrm_update_ae_params(x, attrs);
1da177e4
LT		 578
579 return x;
580
581error:
582 x->km.state = XFRM_STATE_DEAD;
583 xfrm_state_put(x);
584error_no_put:
585 *errp = err;
586 return NULL;
587}
588
22e70050 589static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 590 struct nlattr **attrs)
1da177e4 591{
fc34acd3 592 struct net *net = sock_net(skb->sk);
7b67c857 593 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 594 struct xfrm_state *x;
595 int err;
26b15dad 596 struct km_event c;
c53fa1ed
PM		 597 uid_t loginuid = audit_get_loginuid(current);
598 u32 sessionid = audit_get_sessionid(current);
599 u32 sid;
1da177e4 600
35a7aa08 601 err = verify_newsa_info(p, attrs);
1da177e4
LT		 602 if (err)
603 return err;
604
fc34acd3 605 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 606 if (!x)
607 return err;
608
26b15dad 609 xfrm_state_hold(x);
1da177e4
LT		 610 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
611 err = xfrm_state_add(x);
612 else
613 err = xfrm_state_update(x);
614
c53fa1ed 615 security_task_getsecid(current, &sid);
2532386f 616 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 617
1da177e4
LT		 618 if (err < 0) {
619 x->km.state = XFRM_STATE_DEAD;
21380b81 620 __xfrm_state_put(x);
7d6dfe1f 621 goto out;
1da177e4
LT		 622 }
623
26b15dad
JHS		 624 c.seq = nlh->nlmsg_seq;
625 c.pid = nlh->nlmsg_pid;
f60f6b8f 626 c.event = nlh->nlmsg_type;
26b15dad
JHS		 627
628 km_state_notify(x, &c);
7d6dfe1f 629out:
26b15dad 630 xfrm_state_put(x);
1da177e4
LT		 631 return err;
632}
633
fc34acd3
AD		 634static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
635 struct xfrm_usersa_id *p,
5424f32e 636 struct nlattr **attrs,
eb2971b6
MN		 637 int *errp)
638{
639 struct xfrm_state *x = NULL;
6f26b61e 640 struct xfrm_mark m;
eb2971b6 641 int err;
6f26b61e 642 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 643
644 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
645 err = -ESRCH;
6f26b61e 646 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 647 } else {
648 xfrm_address_t *saddr = NULL;
649
35a7aa08 650 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 651 if (!saddr) {
652 err = -EINVAL;
653 goto out;
654 }
655
9abbffee 656 err = -ESRCH;
6f26b61e
JHS		 657 x = xfrm_state_lookup_byaddr(net, mark,
658 &p->daddr, saddr,
221df1ed 659 p->proto, p->family);
eb2971b6
MN		 660 }
661
662 out:
663 if (!x && errp)
664 *errp = err;
665 return x;
666}
667
22e70050 668static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 669 struct nlattr **attrs)
1da177e4 670{
fc34acd3 671 struct net *net = sock_net(skb->sk);
1da177e4 672 struct xfrm_state *x;
eb2971b6 673 int err = -ESRCH;
26b15dad 674 struct km_event c;
7b67c857 675 struct xfrm_usersa_id *p = nlmsg_data(nlh);
c53fa1ed
PM		 676 uid_t loginuid = audit_get_loginuid(current);
677 u32 sessionid = audit_get_sessionid(current);
678 u32 sid;
1da177e4 679
fc34acd3 680 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 681 if (x == NULL)
eb2971b6 682 return err;
1da177e4 683
6f68dc37 684 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 685 goto out;
686
1da177e4 687 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 688 err = -EPERM;
689 goto out;
1da177e4
LT		 690 }
691
26b15dad 692 err = xfrm_state_delete(x);
161a09e7 693
c8c05a8e
CZ		 694 if (err < 0)
695 goto out;
26b15dad
JHS		 696
697 c.seq = nlh->nlmsg_seq;
698 c.pid = nlh->nlmsg_pid;
f60f6b8f 699 c.event = nlh->nlmsg_type;
26b15dad 700 km_state_notify(x, &c);
1da177e4 701
c8c05a8e 702out:
c53fa1ed 703 security_task_getsecid(current, &sid);
2532386f 704 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
c8c05a8e 705 xfrm_state_put(x);
26b15dad 706 return err;
1da177e4
LT		 707}
708
709static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
710{
f778a636 711 memset(p, 0, sizeof(*p));
1da177e4
LT		 712 memcpy(&p->id, &x->id, sizeof(p->id));
713 memcpy(&p->sel, &x->sel, sizeof(p->sel));
714 memcpy(&p->lft, &x->lft, sizeof(p->lft));
715 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
716 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 717 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 718 p->mode = x->props.mode;
719 p->replay_window = x->props.replay_window;
720 p->reqid = x->props.reqid;
721 p->family = x->props.family;
722 p->flags = x->props.flags;
723 p->seq = x->km.seq;
724}
725
726struct xfrm_dump_info {
727 struct sk_buff *in_skb;
728 struct sk_buff *out_skb;
729 u32 nlmsg_seq;
730 u16 nlmsg_flags;
1da177e4
LT		 731};
732
c0144bea
TG		 733static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
734{
c0144bea
TG		 735 struct xfrm_user_sec_ctx *uctx;
736 struct nlattr *attr;
68325d3b 737 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 738
739 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
740 if (attr == NULL)
741 return -EMSGSIZE;
742
743 uctx = nla_data(attr);
744 uctx->exttype = XFRMA_SEC_CTX;
745 uctx->len = ctx_size;
746 uctx->ctx_doi = s->ctx_doi;
747 uctx->ctx_alg = s->ctx_alg;
748 uctx->ctx_len = s->ctx_len;
749 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
750
751 return 0;
752}
753
4447bb33
MW		 754static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
755{
756 struct xfrm_algo *algo;
757 struct nlattr *nla;
758
759 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
760 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
761 if (!nla)
762 return -EMSGSIZE;
763
764 algo = nla_data(nla);
4c87308b 765 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 766 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
767 algo->alg_key_len = auth->alg_key_len;
768
769 return 0;
770}
771
68325d3b
HX		 772/* Don't change this without updating xfrm_sa_len! */
773static int copy_to_user_state_extra(struct xfrm_state *x,
774 struct xfrm_usersa_info *p,
775 struct sk_buff *skb)
1da177e4 776{
1d1e34dd 777 int ret = 0;
d0fde795 778
1d1e34dd 779 copy_to_user_state(x, p);
68325d3b 780
1d1e34dd
DM		 781 if (x->coaddr) {
782 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
783 if (ret)
784 goto out;
785 }
786 if (x->lastused) {
787 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
788 if (ret)
789 goto out;
790 }
791 if (x->aead) {
792 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
793 if (ret)
794 goto out;
795 }
796 if (x->aalg) {
797 ret = copy_to_user_auth(x->aalg, skb);
798 if (!ret)
799 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
800 xfrm_alg_auth_len(x->aalg), x->aalg);
801 if (ret)
802 goto out;
803 }
804 if (x->ealg) {
805 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
806 if (ret)
807 goto out;
808 }
809 if (x->calg) {
810 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
811 if (ret)
812 goto out;
813 }
814 if (x->encap) {
815 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
816 if (ret)
817 goto out;
818 }
819 if (x->tfcpad) {
820 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
821 if (ret)
822 goto out;
823 }
824 ret = xfrm_mark_put(skb, &x->mark);
825 if (ret)
826 goto out;
827 if (x->replay_esn) {
828 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
829 xfrm_replay_state_esn_len(x->replay_esn),
830 x->replay_esn);
831 if (ret)
832 goto out;
833 }
834 if (x->security)
835 ret = copy_sec_ctx(x->security, skb);
836out:
837 return ret;
68325d3b
HX		 838}
839
840static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
841{
842 struct xfrm_dump_info *sp = ptr;
843 struct sk_buff *in_skb = sp->in_skb;
844 struct sk_buff *skb = sp->out_skb;
845 struct xfrm_usersa_info *p;
846 struct nlmsghdr *nlh;
847 int err;
848
68325d3b
HX		 849 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
850 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
851 if (nlh == NULL)
852 return -EMSGSIZE;
853
854 p = nlmsg_data(nlh);
855
856 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 857 if (err) {
858 nlmsg_cancel(skb, nlh);
859 return err;
860 }
9825069d 861 nlmsg_end(skb, nlh);
1da177e4 862 return 0;
1da177e4
LT		 863}
864
4c563f76
TT		 865static int xfrm_dump_sa_done(struct netlink_callback *cb)
866{
867 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
868 xfrm_state_walk_done(walk);
869 return 0;
870}
871
1da177e4
LT		 872static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
873{
fc34acd3 874 struct net *net = sock_net(skb->sk);
4c563f76 875 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 876 struct xfrm_dump_info info;
877
4c563f76
TT		 878 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
879 sizeof(cb->args) - sizeof(cb->args[0]));
880
1da177e4
LT		 881 info.in_skb = cb->skb;
882 info.out_skb = skb;
883 info.nlmsg_seq = cb->nlh->nlmsg_seq;
884 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 885
886 if (!cb->args[0]) {
887 cb->args[0] = 1;
888 xfrm_state_walk_init(walk, 0);
889 }
890
fc34acd3 891 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 892
893 return skb->len;
894}
895
896static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
897 struct xfrm_state *x, u32 seq)
898{
899 struct xfrm_dump_info info;
900 struct sk_buff *skb;
864745d2 901 int err;
1da177e4 902
7deb2264 903 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 904 if (!skb)
905 return ERR_PTR(-ENOMEM);
906
1da177e4
LT		 907 info.in_skb = in_skb;
908 info.out_skb = skb;
909 info.nlmsg_seq = seq;
910 info.nlmsg_flags = 0;
1da177e4 911
864745d2
MK		 912 err = dump_one_state(x, 0, &info);
913 if (err) {
1da177e4 914 kfree_skb(skb);
864745d2 915 return ERR_PTR(err);
1da177e4
LT		 916 }
917
918 return skb;
919}
920
7deb2264
TG		 921static inline size_t xfrm_spdinfo_msgsize(void)
922{
923 return NLMSG_ALIGN(4)
924 + nla_total_size(sizeof(struct xfrmu_spdinfo))
925 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
926}
927
e071041b
AD		 928static int build_spdinfo(struct sk_buff *skb, struct net *net,
929 u32 pid, u32 seq, u32 flags)
ecfd6b18 930{
5a6d3416
JHS		 931 struct xfrmk_spdinfo si;
932 struct xfrmu_spdinfo spc;
933 struct xfrmu_spdhinfo sph;
ecfd6b18 934 struct nlmsghdr *nlh;
1d1e34dd 935 int err;
ecfd6b18
JHS		 936 u32 *f;
937
938 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 939 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 940 return -EMSGSIZE;
941
942 f = nlmsg_data(nlh);
943 *f = flags;
e071041b 944 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 945 spc.incnt = si.incnt;
946 spc.outcnt = si.outcnt;
947 spc.fwdcnt = si.fwdcnt;
948 spc.inscnt = si.inscnt;
949 spc.outscnt = si.outscnt;
950 spc.fwdscnt = si.fwdscnt;
951 sph.spdhcnt = si.spdhcnt;
952 sph.spdhmcnt = si.spdhmcnt;
953
1d1e34dd
DM		 954 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
955 if (!err)
956 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
957 if (err) {
958 nlmsg_cancel(skb, nlh);
959 return err;
960 }
ecfd6b18
JHS		 961
962 return nlmsg_end(skb, nlh);
ecfd6b18
JHS		 963}
964
965static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 966 struct nlattr **attrs)
ecfd6b18 967{
a6483b79 968 struct net *net = sock_net(skb->sk);
ecfd6b18 969 struct sk_buff *r_skb;
7b67c857 970 u32 *flags = nlmsg_data(nlh);
ecfd6b18
JHS		 971 u32 spid = NETLINK_CB(skb).pid;
972 u32 seq = nlh->nlmsg_seq;
ecfd6b18 973
7deb2264 974 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 975 if (r_skb == NULL)
976 return -ENOMEM;
977
e071041b 978 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
ecfd6b18
JHS		 979 BUG();
980
a6483b79 981 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
ecfd6b18
JHS		 982}
983
7deb2264
TG		 984static inline size_t xfrm_sadinfo_msgsize(void)
985{
986 return NLMSG_ALIGN(4)
987 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
988 + nla_total_size(4); /* XFRMA_SAD_CNT */
989}
990
e071041b
AD		 991static int build_sadinfo(struct sk_buff *skb, struct net *net,
992 u32 pid, u32 seq, u32 flags)
28d8909b 993{
af11e316
JHS		 994 struct xfrmk_sadinfo si;
995 struct xfrmu_sadhinfo sh;
28d8909b 996 struct nlmsghdr *nlh;
1d1e34dd 997 int err;
28d8909b
JHS		 998 u32 *f;
999
1000 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 1001 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 1002 return -EMSGSIZE;
1003
1004 f = nlmsg_data(nlh);
1005 *f = flags;
e071041b 1006 xfrm_sad_getinfo(net, &si);
28d8909b 1007
af11e316
JHS		 1008 sh.sadhmcnt = si.sadhmcnt;
1009 sh.sadhcnt = si.sadhcnt;
1010
1d1e34dd
DM		 1011 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1012 if (!err)
1013 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1014 if (err) {
1015 nlmsg_cancel(skb, nlh);
1016 return err;
1017 }
28d8909b
JHS		 1018
1019 return nlmsg_end(skb, nlh);
28d8909b
JHS		 1020}
1021
1022static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1023 struct nlattr **attrs)
28d8909b 1024{
a6483b79 1025 struct net *net = sock_net(skb->sk);
28d8909b 1026 struct sk_buff *r_skb;
7b67c857 1027 u32 *flags = nlmsg_data(nlh);
28d8909b
JHS		 1028 u32 spid = NETLINK_CB(skb).pid;
1029 u32 seq = nlh->nlmsg_seq;
28d8909b 1030
7deb2264 1031 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1032 if (r_skb == NULL)
1033 return -ENOMEM;
1034
e071041b 1035 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
28d8909b
JHS		 1036 BUG();
1037
a6483b79 1038 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
28d8909b
JHS		 1039}
1040
22e70050 1041static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1042 struct nlattr **attrs)
1da177e4 1043{
fc34acd3 1044 struct net *net = sock_net(skb->sk);
7b67c857 1045 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1046 struct xfrm_state *x;
1047 struct sk_buff *resp_skb;
eb2971b6 1048 int err = -ESRCH;
1da177e4 1049
fc34acd3 1050 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1051 if (x == NULL)
1052 goto out_noput;
1053
1054 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1055 if (IS_ERR(resp_skb)) {
1056 err = PTR_ERR(resp_skb);
1057 } else {
a6483b79 1058 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 1059 }
1060 xfrm_state_put(x);
1061out_noput:
1062 return err;
1063}
1064
1065static int verify_userspi_info(struct xfrm_userspi_info *p)
1066{
1067 switch (p->info.id.proto) {
1068 case IPPROTO_AH:
1069 case IPPROTO_ESP:
1070 break;
1071
1072 case IPPROTO_COMP:
1073 /* IPCOMP spi is 16-bits. */
1074 if (p->max >= 0x10000)
1075 return -EINVAL;
1076 break;
1077
1078 default:
1079 return -EINVAL;
3ff50b79 1080 }
1da177e4
LT		 1081
1082 if (p->min > p->max)
1083 return -EINVAL;
1084
1085 return 0;
1086}
1087
22e70050 1088static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1089 struct nlattr **attrs)
1da177e4 1090{
fc34acd3 1091 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1092 struct xfrm_state *x;
1093 struct xfrm_userspi_info *p;
1094 struct sk_buff *resp_skb;
1095 xfrm_address_t *daddr;
1096 int family;
1097 int err;
6f26b61e
JHS		 1098 u32 mark;
1099 struct xfrm_mark m;
1da177e4 1100
7b67c857 1101 p = nlmsg_data(nlh);
1da177e4
LT		 1102 err = verify_userspi_info(p);
1103 if (err)
1104 goto out_noput;
1105
1106 family = p->info.family;
1107 daddr = &p->info.id.daddr;
1108
1109 x = NULL;
6f26b61e
JHS		 1110
1111 mark = xfrm_mark_get(attrs, &m);
1da177e4 1112 if (p->info.seq) {
6f26b61e 1113 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1da177e4
LT		 1114 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1115 xfrm_state_put(x);
1116 x = NULL;
1117 }
1118 }
1119
1120 if (!x)
6f26b61e 1121 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1122 p->info.id.proto, daddr,
1123 &p->info.saddr, 1,
1124 family);
1125 err = -ENOENT;
1126 if (x == NULL)
1127 goto out_noput;
1128
658b219e
HX		 1129 err = xfrm_alloc_spi(x, p->min, p->max);
1130 if (err)
1131 goto out;
1da177e4 1132
658b219e 1133 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1134 if (IS_ERR(resp_skb)) {
1135 err = PTR_ERR(resp_skb);
1136 goto out;
1137 }
1138
a6483b79 1139 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 1140
1141out:
1142 xfrm_state_put(x);
1143out_noput:
1144 return err;
1145}
1146
b798a9ed 1147static int verify_policy_dir(u8 dir)
1da177e4
LT		 1148{
1149 switch (dir) {
1150 case XFRM_POLICY_IN:
1151 case XFRM_POLICY_OUT:
1152 case XFRM_POLICY_FWD:
1153 break;
1154
1155 default:
1156 return -EINVAL;
3ff50b79 1157 }
1da177e4
LT		 1158
1159 return 0;
1160}
1161
b798a9ed 1162static int verify_policy_type(u8 type)
f7b6983f
MN		 1163{
1164 switch (type) {
1165 case XFRM_POLICY_TYPE_MAIN:
1166#ifdef CONFIG_XFRM_SUB_POLICY
1167 case XFRM_POLICY_TYPE_SUB:
1168#endif
1169 break;
1170
1171 default:
1172 return -EINVAL;
3ff50b79 1173 }
f7b6983f
MN		 1174
1175 return 0;
1176}
1177
1da177e4
LT		 1178static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1179{
1180 switch (p->share) {
1181 case XFRM_SHARE_ANY:
1182 case XFRM_SHARE_SESSION:
1183 case XFRM_SHARE_USER:
1184 case XFRM_SHARE_UNIQUE:
1185 break;
1186
1187 default:
1188 return -EINVAL;
3ff50b79 1189 }
1da177e4
LT		 1190
1191 switch (p->action) {
1192 case XFRM_POLICY_ALLOW:
1193 case XFRM_POLICY_BLOCK:
1194 break;
1195
1196 default:
1197 return -EINVAL;
3ff50b79 1198 }
1da177e4
LT		 1199
1200 switch (p->sel.family) {
1201 case AF_INET:
1202 break;
1203
1204 case AF_INET6:
dfd56b8b 1205#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1206 break;
1207#else
1208 return -EAFNOSUPPORT;
1209#endif
1210
1211 default:
1212 return -EINVAL;
3ff50b79 1213 }
1da177e4
LT		 1214
1215 return verify_policy_dir(p->dir);
1216}
1217
5424f32e 1218static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1219{
5424f32e 1220 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1221 struct xfrm_user_sec_ctx *uctx;
1222
1223 if (!rt)
1224 return 0;
1225
5424f32e 1226 uctx = nla_data(rt);
03e1ad7b 1227 return security_xfrm_policy_alloc(&pol->security, uctx);
df71837d
TJ		 1228}
1229
1da177e4
LT		 1230static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1231 int nr)
1232{
1233 int i;
1234
1235 xp->xfrm_nr = nr;
1236 for (i = 0; i < nr; i++, ut++) {
1237 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1238
1239 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1240 memcpy(&t->saddr, &ut->saddr,
1241 sizeof(xfrm_address_t));
1242 t->reqid = ut->reqid;
1243 t->mode = ut->mode;
1244 t->share = ut->share;
1245 t->optional = ut->optional;
1246 t->aalgos = ut->aalgos;
1247 t->ealgos = ut->ealgos;
1248 t->calgos = ut->calgos;
c5d18e98
HX		 1249 /* If all masks are ~0, then we allow all algorithms. */
1250 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1251 t->encap_family = ut->family;
1da177e4
LT		 1252 }
1253}
1254
b4ad86bf
DM		 1255static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1256{
1257 int i;
1258
1259 if (nr > XFRM_MAX_DEPTH)
1260 return -EINVAL;
1261
1262 for (i = 0; i < nr; i++) {
1263 /* We never validated the ut->family value, so many
1264 * applications simply leave it at zero. The check was
1265 * never made and ut->family was ignored because all
1266 * templates could be assumed to have the same family as
1267 * the policy itself. Now that we will have ipv4-in-ipv6
1268 * and ipv6-in-ipv4 tunnels, this is no longer true.
1269 */
1270 if (!ut[i].family)
1271 ut[i].family = family;
1272
1273 switch (ut[i].family) {
1274 case AF_INET:
1275 break;
dfd56b8b 1276#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1277 case AF_INET6:
1278 break;
1279#endif
1280 default:
1281 return -EINVAL;
3ff50b79 1282 }
b4ad86bf
DM		 1283 }
1284
1285 return 0;
1286}
1287
5424f32e 1288static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1289{
5424f32e 1290 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1291
1292 if (!rt) {
1293 pol->xfrm_nr = 0;
1294 } else {
5424f32e
TG		 1295 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1296 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1297 int err;
1da177e4 1298
b4ad86bf
DM		 1299 err = validate_tmpl(nr, utmpl, pol->family);
1300 if (err)
1301 return err;
1da177e4 1302
5424f32e 1303 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1304 }
1305 return 0;
1306}
1307
5424f32e 1308static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1309{
5424f32e 1310 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1311 struct xfrm_userpolicy_type *upt;
b798a9ed 1312 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1313 int err;
1314
1315 if (rt) {
5424f32e 1316 upt = nla_data(rt);
f7b6983f
MN		 1317 type = upt->type;
1318 }
1319
1320 err = verify_policy_type(type);
1321 if (err)
1322 return err;
1323
1324 *tp = type;
1325 return 0;
1326}
1327
1da177e4
LT		 1328static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1329{
1330 xp->priority = p->priority;
1331 xp->index = p->index;
1332 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1333 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1334 xp->action = p->action;
1335 xp->flags = p->flags;
1336 xp->family = p->sel.family;
1337 /* XXX xp->share = p->share; */
1338}
1339
1340static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1341{
7b789836 1342 memset(p, 0, sizeof(*p));
1da177e4
LT		 1343 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1344 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1345 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1346 p->priority = xp->priority;
1347 p->index = xp->index;
1348 p->sel.family = xp->family;
1349 p->dir = dir;
1350 p->action = xp->action;
1351 p->flags = xp->flags;
1352 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1353}
1354
fc34acd3 1355static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1356{
fc34acd3 1357 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1358 int err;
1359
1360 if (!xp) {
1361 *errp = -ENOMEM;
1362 return NULL;
1363 }
1364
1365 copy_from_user_policy(xp, p);
df71837d 1366
35a7aa08 1367 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1368 if (err)
1369 goto error;
1370
35a7aa08
TG		 1371 if (!(err = copy_from_user_tmpl(xp, attrs)))
1372 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1373 if (err)
1374 goto error;
1da177e4 1375
295fae56
JHS		 1376 xfrm_mark_get(attrs, &xp->mark);
1377
1da177e4 1378 return xp;
f7b6983f
MN		 1379 error:
1380 *errp = err;
12a169e7 1381 xp->walk.dead = 1;
64c31b3f 1382 xfrm_policy_destroy(xp);
f7b6983f 1383 return NULL;
1da177e4
LT		 1384}
1385
22e70050 1386static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1387 struct nlattr **attrs)
1da177e4 1388{
fc34acd3 1389 struct net *net = sock_net(skb->sk);
7b67c857 1390 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1391 struct xfrm_policy *xp;
26b15dad 1392 struct km_event c;
1da177e4
LT		 1393 int err;
1394 int excl;
c53fa1ed
PM		 1395 uid_t loginuid = audit_get_loginuid(current);
1396 u32 sessionid = audit_get_sessionid(current);
1397 u32 sid;
1da177e4
LT		 1398
1399 err = verify_newpolicy_info(p);
df71837d
TJ		 1400 if (err)
1401 return err;
35a7aa08 1402 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1403 if (err)
1404 return err;
1405
fc34acd3 1406 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1407 if (!xp)
1408 return err;
1409
25985edc 1410 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1411 * Aha! this is anti-netlink really i.e more pfkey derived
1412 * in netlink excl is a flag and you wouldnt need
1413 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1414 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1415 err = xfrm_policy_insert(p->dir, xp, excl);
c53fa1ed 1416 security_task_getsecid(current, &sid);
2532386f 1417 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 1418
1da177e4 1419 if (err) {
03e1ad7b 1420 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1421 kfree(xp);
1422 return err;
1423 }
1424
f60f6b8f 1425 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1426 c.seq = nlh->nlmsg_seq;
1427 c.pid = nlh->nlmsg_pid;
1428 km_policy_notify(xp, p->dir, &c);
1429
1da177e4
LT		 1430 xfrm_pol_put(xp);
1431
1432 return 0;
1433}
1434
1435static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1436{
1437 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1438 int i;
1439
1440 if (xp->xfrm_nr == 0)
1441 return 0;
1442
1443 for (i = 0; i < xp->xfrm_nr; i++) {
1444 struct xfrm_user_tmpl *up = &vec[i];
1445 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1446
1f86840f 1447 memset(up, 0, sizeof(*up));
1da177e4 1448 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1449 up->family = kp->encap_family;
1da177e4
LT		 1450 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1451 up->reqid = kp->reqid;
1452 up->mode = kp->mode;
1453 up->share = kp->share;
1454 up->optional = kp->optional;
1455 up->aalgos = kp->aalgos;
1456 up->ealgos = kp->ealgos;
1457 up->calgos = kp->calgos;
1458 }
df71837d 1459
c0144bea
TG		 1460 return nla_put(skb, XFRMA_TMPL,
1461 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1462}
1463
1464static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1465{
1466 if (x->security) {
1467 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1468 }
1469 return 0;
0d681623 1470}
df71837d 1471
0d681623
SH		 1472static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1473{
1d1e34dd 1474 if (xp->security)
0d681623 1475 return copy_sec_ctx(xp->security, skb);
0d681623 1476 return 0;
df71837d 1477}
cfbfd45a
TG		 1478static inline size_t userpolicy_type_attrsize(void)
1479{
1480#ifdef CONFIG_XFRM_SUB_POLICY
1481 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1482#else
1483 return 0;
1484#endif
1485}
df71837d 1486
f7b6983f 1487#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1488static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1489{
c0144bea
TG		 1490 struct xfrm_userpolicy_type upt = {
1491 .type = type,
1492 };
f7b6983f 1493
c0144bea 1494 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1495}
1496
1497#else
b798a9ed 1498static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1499{
1500 return 0;
1501}
1502#endif
1503
1da177e4
LT		 1504static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1505{
1506 struct xfrm_dump_info *sp = ptr;
1507 struct xfrm_userpolicy_info *p;
1508 struct sk_buff *in_skb = sp->in_skb;
1509 struct sk_buff *skb = sp->out_skb;
1510 struct nlmsghdr *nlh;
1d1e34dd 1511 int err;
1da177e4 1512
79b8b7f4
TG		 1513 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1514 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1515 if (nlh == NULL)
1516 return -EMSGSIZE;
1da177e4 1517
7b67c857 1518 p = nlmsg_data(nlh);
1da177e4 1519 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1520 err = copy_to_user_tmpl(xp, skb);
1521 if (!err)
1522 err = copy_to_user_sec_ctx(xp, skb);
1523 if (!err)
1524 err = copy_to_user_policy_type(xp->type, skb);
1525 if (!err)
1526 err = xfrm_mark_put(skb, &xp->mark);
1527 if (err) {
1528 nlmsg_cancel(skb, nlh);
1529 return err;
1530 }
9825069d 1531 nlmsg_end(skb, nlh);
1da177e4 1532 return 0;
1da177e4
LT		 1533}
1534
4c563f76
TT		 1535static int xfrm_dump_policy_done(struct netlink_callback *cb)
1536{
1537 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1538
1539 xfrm_policy_walk_done(walk);
1540 return 0;
1541}
1542
1da177e4
LT		 1543static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1544{
fc34acd3 1545 struct net *net = sock_net(skb->sk);
4c563f76 1546 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1547 struct xfrm_dump_info info;
1548
4c563f76
TT		 1549 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1550 sizeof(cb->args) - sizeof(cb->args[0]));
1551
1da177e4
LT		 1552 info.in_skb = cb->skb;
1553 info.out_skb = skb;
1554 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1555 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1556
1557 if (!cb->args[0]) {
1558 cb->args[0] = 1;
1559 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1560 }
1561
fc34acd3 1562 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1563
1564 return skb->len;
1565}
1566
1567static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1568 struct xfrm_policy *xp,
1569 int dir, u32 seq)
1570{
1571 struct xfrm_dump_info info;
1572 struct sk_buff *skb;
c2546372 1573 int err;
1da177e4 1574
7deb2264 1575 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1576 if (!skb)
1577 return ERR_PTR(-ENOMEM);
1578
1da177e4
LT		 1579 info.in_skb = in_skb;
1580 info.out_skb = skb;
1581 info.nlmsg_seq = seq;
1582 info.nlmsg_flags = 0;
1da177e4 1583
c2546372
MK		 1584 err = dump_one_policy(xp, dir, 0, &info);
1585 if (err) {
1da177e4 1586 kfree_skb(skb);
c2546372 1587 return ERR_PTR(err);
1da177e4
LT		 1588 }
1589
1590 return skb;
1591}
1592
22e70050 1593static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1594 struct nlattr **attrs)
1da177e4 1595{
fc34acd3 1596 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1597 struct xfrm_policy *xp;
1598 struct xfrm_userpolicy_id *p;
b798a9ed 1599 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1600 int err;
26b15dad 1601 struct km_event c;
1da177e4 1602 int delete;
295fae56
JHS		 1603 struct xfrm_mark m;
1604 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1605
7b67c857 1606 p = nlmsg_data(nlh);
1da177e4
LT		 1607 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1608
35a7aa08 1609 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1610 if (err)
1611 return err;
1612
1da177e4
LT		 1613 err = verify_policy_dir(p->dir);
1614 if (err)
1615 return err;
1616
1617 if (p->index)
295fae56 1618 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1619 else {
5424f32e 1620 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1621 struct xfrm_sec_ctx *ctx;
df71837d 1622
35a7aa08 1623 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1624 if (err)
1625 return err;
1626
2c8dd116 1627 ctx = NULL;
df71837d 1628 if (rt) {
5424f32e 1629 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1630
03e1ad7b
PM		 1631 err = security_xfrm_policy_alloc(&ctx, uctx);
1632 if (err)
df71837d 1633 return err;
2c8dd116 1634 }
295fae56 1635 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1636 ctx, delete, &err);
03e1ad7b 1637 security_xfrm_policy_free(ctx);
df71837d 1638 }
1da177e4
LT		 1639 if (xp == NULL)
1640 return -ENOENT;
1641
1642 if (!delete) {
1643 struct sk_buff *resp_skb;
1644
1645 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1646 if (IS_ERR(resp_skb)) {
1647 err = PTR_ERR(resp_skb);
1648 } else {
a6483b79 1649 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
082a1ad5 1650 NETLINK_CB(skb).pid);
1da177e4 1651 }
26b15dad 1652 } else {
c53fa1ed
PM		 1653 uid_t loginuid = audit_get_loginuid(current);
1654 u32 sessionid = audit_get_sessionid(current);
1655 u32 sid;
2532386f 1656
c53fa1ed 1657 security_task_getsecid(current, &sid);
2532386f
EP		 1658 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1659 sid);
13fcfbb0
DM		 1660
1661 if (err != 0)
c8c05a8e 1662 goto out;
13fcfbb0 1663
e7443892 1664 c.data.byid = p->index;
f60f6b8f 1665 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1666 c.seq = nlh->nlmsg_seq;
1667 c.pid = nlh->nlmsg_pid;
1668 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1669 }
1670
c8c05a8e 1671out:
ef41aaa0 1672 xfrm_pol_put(xp);
1da177e4
LT		 1673 return err;
1674}
1675
22e70050 1676static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1677 struct nlattr **attrs)
1da177e4 1678{
fc34acd3 1679 struct net *net = sock_net(skb->sk);
26b15dad 1680 struct km_event c;
7b67c857 1681 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
161a09e7 1682 struct xfrm_audit audit_info;
4aa2e62c 1683 int err;
1da177e4 1684
c53fa1ed
PM		 1685 audit_info.loginuid = audit_get_loginuid(current);
1686 audit_info.sessionid = audit_get_sessionid(current);
1687 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1688 err = xfrm_state_flush(net, p->proto, &audit_info);
9e64cc95
JHS		 1689 if (err) {
1690 if (err == -ESRCH) /* empty table */
1691 return 0;
069c474e 1692 return err;
9e64cc95 1693 }
bf08867f 1694 c.data.proto = p->proto;
f60f6b8f 1695 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1696 c.seq = nlh->nlmsg_seq;
1697 c.pid = nlh->nlmsg_pid;
7067802e 1698 c.net = net;
26b15dad
JHS		 1699 km_state_notify(NULL, &c);
1700
1da177e4
LT		 1701 return 0;
1702}
1703
d8647b79 1704static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1705{
d8647b79
SK		 1706 size_t replay_size = x->replay_esn ?
1707 xfrm_replay_state_esn_len(x->replay_esn) :
1708 sizeof(struct xfrm_replay_state);
1709
7deb2264 1710 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1711 + nla_total_size(replay_size)
7deb2264 1712 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1713 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1714 + nla_total_size(4) /* XFRM_AE_RTHR */
1715 + nla_total_size(4); /* XFRM_AE_ETHR */
1716}
d51d081d 1717
214e005b 1718static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1719{
1720 struct xfrm_aevent_id *id;
1721 struct nlmsghdr *nlh;
1d1e34dd 1722 int err;
d51d081d 1723
79b8b7f4
TG		 1724 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1725 if (nlh == NULL)
1726 return -EMSGSIZE;
d51d081d 1727
7b67c857 1728 id = nlmsg_data(nlh);
2b5f6dcc 1729 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
d51d081d
JHS		 1730 id->sa_id.spi = x->id.spi;
1731 id->sa_id.family = x->props.family;
1732 id->sa_id.proto = x->id.proto;
2b5f6dcc
JHS		 1733 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1734 id->reqid = x->props.reqid;
d51d081d
JHS		 1735 id->flags = c->data.aevent;
1736
d0fde795 1737 if (x->replay_esn) {
1d1e34dd
DM		 1738 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1739 xfrm_replay_state_esn_len(x->replay_esn),
1740 x->replay_esn);
d0fde795 1741 } else {
1d1e34dd
DM		 1742 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1743 &x->replay);
d0fde795 1744 }
1d1e34dd
DM		 1745 if (err)
1746 goto out_cancel;
1747 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1748 if (err)
1749 goto out_cancel;
d51d081d 1750
1d1e34dd
DM		 1751 if (id->flags & XFRM_AE_RTHR) {
1752 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1753 if (err)
1754 goto out_cancel;
1755 }
1756 if (id->flags & XFRM_AE_ETHR) {
1757 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1758 x->replay_maxage * 10 / HZ);
1759 if (err)
1760 goto out_cancel;
1761 }
1762 err = xfrm_mark_put(skb, &x->mark);
1763 if (err)
1764 goto out_cancel;
6f26b61e 1765
9825069d 1766 return nlmsg_end(skb, nlh);
d51d081d 1767
1d1e34dd 1768out_cancel:
9825069d 1769 nlmsg_cancel(skb, nlh);
1d1e34dd 1770 return err;
d51d081d
JHS		 1771}
1772
22e70050 1773static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1774 struct nlattr **attrs)
d51d081d 1775{
fc34acd3 1776 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1777 struct xfrm_state *x;
1778 struct sk_buff *r_skb;
1779 int err;
1780 struct km_event c;
6f26b61e
JHS		 1781 u32 mark;
1782 struct xfrm_mark m;
7b67c857 1783 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1784 struct xfrm_usersa_id *id = &p->sa_id;
1785
6f26b61e
JHS		 1786 mark = xfrm_mark_get(attrs, &m);
1787
1788 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1789 if (x == NULL)
d51d081d 1790 return -ESRCH;
d8647b79
SK		 1791
1792 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1793 if (r_skb == NULL) {
1794 xfrm_state_put(x);
1795 return -ENOMEM;
d51d081d
JHS		 1796 }
1797
1798 /*
1799 * XXX: is this lock really needed - none of the other
1800 * gets lock (the concern is things getting updated
1801 * while we are still reading) - jhs
1802 */
1803 spin_lock_bh(&x->lock);
1804 c.data.aevent = p->flags;
1805 c.seq = nlh->nlmsg_seq;
1806 c.pid = nlh->nlmsg_pid;
1807
1808 if (build_aevent(r_skb, x, &c) < 0)
1809 BUG();
a6483b79 1810 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
d51d081d
JHS		 1811 spin_unlock_bh(&x->lock);
1812 xfrm_state_put(x);
1813 return err;
1814}
1815
22e70050 1816static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1817 struct nlattr **attrs)
d51d081d 1818{
fc34acd3 1819 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1820 struct xfrm_state *x;
1821 struct km_event c;
1822 int err = - EINVAL;
6f26b61e
JHS		 1823 u32 mark = 0;
1824 struct xfrm_mark m;
7b67c857 1825 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1826 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1827 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1828 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1829
d8647b79 1830 if (!lt && !rp && !re)
d51d081d
JHS		 1831 return err;
1832
1833 /* pedantic mode - thou shalt sayeth replaceth */
1834 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1835 return err;
1836
6f26b61e
JHS		 1837 mark = xfrm_mark_get(attrs, &m);
1838
1839 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1840 if (x == NULL)
1841 return -ESRCH;
1842
1843 if (x->km.state != XFRM_STATE_VALID)
1844 goto out;
1845
e2b19125
SK		 1846 err = xfrm_replay_verify_len(x->replay_esn, rp);
1847 if (err)
1848 goto out;
1849
d51d081d 1850 spin_lock_bh(&x->lock);
35a7aa08 1851 xfrm_update_ae_params(x, attrs);
d51d081d 1852 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1853
1854 c.event = nlh->nlmsg_type;
1855 c.seq = nlh->nlmsg_seq;
1856 c.pid = nlh->nlmsg_pid;
1857 c.data.aevent = XFRM_AE_CU;
1858 km_state_notify(x, &c);
1859 err = 0;
1860out:
1861 xfrm_state_put(x);
1862 return err;
1863}
1864
22e70050 1865static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1866 struct nlattr **attrs)
1da177e4 1867{
fc34acd3 1868 struct net *net = sock_net(skb->sk);
f7b6983f 1869 struct km_event c;
b798a9ed 1870 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1871 int err;
161a09e7 1872 struct xfrm_audit audit_info;
f7b6983f 1873
35a7aa08 1874 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1875 if (err)
1876 return err;
26b15dad 1877
c53fa1ed
PM		 1878 audit_info.loginuid = audit_get_loginuid(current);
1879 audit_info.sessionid = audit_get_sessionid(current);
1880 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1881 err = xfrm_policy_flush(net, type, &audit_info);
2f1eb65f
JHS		 1882 if (err) {
1883 if (err == -ESRCH) /* empty table */
1884 return 0;
069c474e 1885 return err;
2f1eb65f
JHS		 1886 }
1887
f7b6983f 1888 c.data.type = type;
f60f6b8f 1889 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1890 c.seq = nlh->nlmsg_seq;
1891 c.pid = nlh->nlmsg_pid;
7067802e 1892 c.net = net;
26b15dad 1893 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1894 return 0;
1895}
1896
22e70050 1897static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1898 struct nlattr **attrs)
6c5c8ca7 1899{
fc34acd3 1900 struct net *net = sock_net(skb->sk);
6c5c8ca7 1901 struct xfrm_policy *xp;
7b67c857 1902 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1903 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1904 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1905 int err = -ENOENT;
295fae56
JHS		 1906 struct xfrm_mark m;
1907 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1908
35a7aa08 1909 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1910 if (err)
1911 return err;
1912
c8bf4d04
TT		 1913 err = verify_policy_dir(p->dir);
1914 if (err)
1915 return err;
1916
6c5c8ca7 1917 if (p->index)
295fae56 1918 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1919 else {
5424f32e 1920 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1921 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1922
35a7aa08 1923 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1924 if (err)
1925 return err;
1926
2c8dd116 1927 ctx = NULL;
6c5c8ca7 1928 if (rt) {
5424f32e 1929 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1930
03e1ad7b
PM		 1931 err = security_xfrm_policy_alloc(&ctx, uctx);
1932 if (err)
6c5c8ca7 1933 return err;
2c8dd116 1934 }
295fae56 1935 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 1936 &p->sel, ctx, 0, &err);
03e1ad7b 1937 security_xfrm_policy_free(ctx);
6c5c8ca7 1938 }
6c5c8ca7 1939 if (xp == NULL)
ef41aaa0 1940 return -ENOENT;
03e1ad7b 1941
ea2dea9d 1942 if (unlikely(xp->walk.dead))
6c5c8ca7 1943 goto out;
6c5c8ca7 1944
6c5c8ca7
JHS		 1945 err = 0;
1946 if (up->hard) {
c53fa1ed
PM		 1947 uid_t loginuid = audit_get_loginuid(current);
1948 u32 sessionid = audit_get_sessionid(current);
1949 u32 sid;
1950
1951 security_task_getsecid(current, &sid);
6c5c8ca7 1952 xfrm_policy_delete(xp, p->dir);
2532386f 1953 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
161a09e7 1954
6c5c8ca7
JHS		 1955 } else {
1956 // reset the timers here?
62db5cfd 1957 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7
JHS		 1958 }
1959 km_policy_expired(xp, p->dir, up->hard, current->pid);
1960
1961out:
1962 xfrm_pol_put(xp);
1963 return err;
1964}
1965
22e70050 1966static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1967 struct nlattr **attrs)
53bc6b4d 1968{
fc34acd3 1969 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 1970 struct xfrm_state *x;
1971 int err;
7b67c857 1972 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 1973 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 1974 struct xfrm_mark m;
928497f0 1975 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 1976
6f26b61e 1977 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 1978
3a765aa5 1979 err = -ENOENT;
53bc6b4d
JHS		 1980 if (x == NULL)
1981 return err;
1982
53bc6b4d 1983 spin_lock_bh(&x->lock);
3a765aa5 1984 err = -EINVAL;
53bc6b4d
JHS		 1985 if (x->km.state != XFRM_STATE_VALID)
1986 goto out;
1987 km_state_expired(x, ue->hard, current->pid);
1988
161a09e7 1989 if (ue->hard) {
c53fa1ed
PM		 1990 uid_t loginuid = audit_get_loginuid(current);
1991 u32 sessionid = audit_get_sessionid(current);
1992 u32 sid;
1993
1994 security_task_getsecid(current, &sid);
53bc6b4d 1995 __xfrm_state_delete(x);
2532386f 1996 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
161a09e7 1997 }
3a765aa5 1998 err = 0;
53bc6b4d
JHS		 1999out:
2000 spin_unlock_bh(&x->lock);
2001 xfrm_state_put(x);
2002 return err;
2003}
2004
22e70050 2005static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2006 struct nlattr **attrs)
980ebd25 2007{
fc34acd3 2008 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 2009 struct xfrm_policy *xp;
2010 struct xfrm_user_tmpl *ut;
2011 int i;
5424f32e 2012 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 2013 struct xfrm_mark mark;
980ebd25 2014
7b67c857 2015 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 2016 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 2017 int err = -ENOMEM;
2018
2019 if (!x)
d8eb9307 2020 goto nomem;
980ebd25 2021
6f26b61e
JHS		 2022 xfrm_mark_get(attrs, &mark);
2023
980ebd25 2024 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 2025 if (err)
2026 goto bad_policy;
980ebd25
JHS		 2027
2028 /* build an XP */
fc34acd3 2029 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2030 if (!xp)
2031 goto free_state;
980ebd25
JHS		 2032
2033 memcpy(&x->id, &ua->id, sizeof(ua->id));
2034 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2035 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2036 xp->mark.m = x->mark.m = mark.m;
2037 xp->mark.v = x->mark.v = mark.v;
5424f32e 2038 ut = nla_data(rt);
980ebd25
JHS		 2039 /* extract the templates and for each call km_key */
2040 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2041 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2042 memcpy(&x->id, &t->id, sizeof(x->id));
2043 x->props.mode = t->mode;
2044 x->props.reqid = t->reqid;
2045 x->props.family = ut->family;
2046 t->aalgos = ua->aalgos;
2047 t->ealgos = ua->ealgos;
2048 t->calgos = ua->calgos;
2049 err = km_query(x, t, xp);
2050
2051 }
2052
2053 kfree(x);
2054 kfree(xp);
2055
2056 return 0;
d8eb9307
IJ		 2057
2058bad_policy:
62db5cfd 2059 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2060free_state:
2061 kfree(x);
2062nomem:
2063 return err;
980ebd25
JHS		 2064}
2065
5c79de6e 2066#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2067static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2068 struct xfrm_kmaddress *k,
5424f32e 2069 struct nlattr **attrs, int *num)
5c79de6e 2070{
5424f32e 2071 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2072 struct xfrm_user_migrate *um;
2073 int i, num_migrate;
2074
13c1d189
AE		 2075 if (k != NULL) {
2076 struct xfrm_user_kmaddress *uk;
2077
2078 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2079 memcpy(&k->local, &uk->local, sizeof(k->local));
2080 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2081 k->family = uk->family;
2082 k->reserved = uk->reserved;
2083 }
2084
5424f32e
TG		 2085 um = nla_data(rt);
2086 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2087
2088 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2089 return -EINVAL;
2090
2091 for (i = 0; i < num_migrate; i++, um++, ma++) {
2092 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2093 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2094 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2095 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2096
2097 ma->proto = um->proto;
2098 ma->mode = um->mode;
2099 ma->reqid = um->reqid;
2100
2101 ma->old_family = um->old_family;
2102 ma->new_family = um->new_family;
2103 }
2104
2105 *num = i;
2106 return 0;
2107}
2108
2109static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2110 struct nlattr **attrs)
5c79de6e 2111{
7b67c857 2112 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2113 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2114 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2115 u8 type;
2116 int err;
2117 int n = 0;
2118
35a7aa08 2119 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2120 return -EINVAL;
5c79de6e 2121
13c1d189
AE		 2122 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2123
5424f32e 2124 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2125 if (err)
2126 return err;
2127
13c1d189 2128 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2129 if (err)
2130 return err;
2131
2132 if (!n)
2133 return 0;
2134
13c1d189 2135 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
5c79de6e
SS		 2136
2137 return 0;
2138}
2139#else
2140static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2141 struct nlattr **attrs)
5c79de6e
SS		 2142{
2143 return -ENOPROTOOPT;
2144}
2145#endif
2146
2147#ifdef CONFIG_XFRM_MIGRATE
183cad12 2148static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2149{
2150 struct xfrm_user_migrate um;
2151
2152 memset(&um, 0, sizeof(um));
2153 um.proto = m->proto;
2154 um.mode = m->mode;
2155 um.reqid = m->reqid;
2156 um.old_family = m->old_family;
2157 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2158 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2159 um.new_family = m->new_family;
2160 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2161 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2162
c0144bea 2163 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2164}
2165
183cad12 2166static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2167{
2168 struct xfrm_user_kmaddress uk;
2169
2170 memset(&uk, 0, sizeof(uk));
2171 uk.family = k->family;
2172 uk.reserved = k->reserved;
2173 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2174 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2175
2176 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2177}
2178
2179static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2180{
2181 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2182 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2183 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2184 + userpolicy_type_attrsize();
7deb2264
TG		 2185}
2186
183cad12
DM		 2187static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2188 int num_migrate, const struct xfrm_kmaddress *k,
2189 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2190{
183cad12 2191 const struct xfrm_migrate *mp;
5c79de6e
SS		 2192 struct xfrm_userpolicy_id *pol_id;
2193 struct nlmsghdr *nlh;
1d1e34dd 2194 int i, err;
5c79de6e 2195
79b8b7f4
TG		 2196 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2197 if (nlh == NULL)
2198 return -EMSGSIZE;
5c79de6e 2199
7b67c857 2200 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2201 /* copy data from selector, dir, and type to the pol_id */
2202 memset(pol_id, 0, sizeof(*pol_id));
2203 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2204 pol_id->dir = dir;
2205
1d1e34dd
DM		 2206 if (k != NULL) {
2207 err = copy_to_user_kmaddress(k, skb);
2208 if (err)
2209 goto out_cancel;
2210 }
2211 err = copy_to_user_policy_type(type, skb);
2212 if (err)
2213 goto out_cancel;
5c79de6e 2214 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2215 err = copy_to_user_migrate(mp, skb);
2216 if (err)
2217 goto out_cancel;
5c79de6e
SS		 2218 }
2219
9825069d 2220 return nlmsg_end(skb, nlh);
1d1e34dd
DM		 2221
2222out_cancel:
9825069d 2223 nlmsg_cancel(skb, nlh);
1d1e34dd 2224 return err;
5c79de6e
SS		 2225}
2226
183cad12
DM		 2227static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2228 const struct xfrm_migrate *m, int num_migrate,
2229 const struct xfrm_kmaddress *k)
5c79de6e 2230{
a6483b79 2231 struct net *net = &init_net;
5c79de6e 2232 struct sk_buff *skb;
5c79de6e 2233
13c1d189 2234 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2235 if (skb == NULL)
2236 return -ENOMEM;
2237
2238 /* build migrate */
13c1d189 2239 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2240 BUG();
2241
a6483b79 2242 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
5c79de6e
SS		 2243}
2244#else
183cad12
DM		 2245static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2246 const struct xfrm_migrate *m, int num_migrate,
2247 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2248{
2249 return -ENOPROTOOPT;
2250}
2251#endif
d51d081d 2252
a7bd9a45 2253#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2254
2255static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2256 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2257 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2258 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2259 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2260 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2261 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2262 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2263 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2264 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2265 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2266 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2267 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2268 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2269 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2270 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2271 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2272 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2273 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 2274 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2275 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2276};
2277
492b558b
TG		 2278#undef XMSGSIZE
2279
cf5cb79f 2280static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2281 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2282 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2283 [XFRMA_LASTUSED] = { .type = NLA_U64},
2284 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2285 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2286 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2287 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2288 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2289 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2290 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2291 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2292 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2293 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2294 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2295 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2296 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2297 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2298 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2299 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2300 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2301 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2302 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2303 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
cf5cb79f
TG		 2304};
2305
1da177e4 2306static struct xfrm_link {
5424f32e 2307 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2308 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2309 int (*done)(struct netlink_callback *);
492b558b
TG		 2310} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2311 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2312 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2313 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2314 .dump = xfrm_dump_sa,
2315 .done = xfrm_dump_sa_done },
492b558b
TG		 2316 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2317 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2318 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2319 .dump = xfrm_dump_policy,
2320 .done = xfrm_dump_policy_done },
492b558b 2321 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2322 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2323 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2324 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2325 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2326 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2327 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2328 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2329 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2330 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2331 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2332 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 2333 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2334};
2335
1d00a4eb 2336static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2337{
a6483b79 2338 struct net *net = sock_net(skb->sk);
35a7aa08 2339 struct nlattr *attrs[XFRMA_MAX+1];
1da177e4 2340 struct xfrm_link *link;
a7bd9a45 2341 int type, err;
1da177e4 2342
1da177e4 2343 type = nlh->nlmsg_type;
1da177e4 2344 if (type > XFRM_MSG_MAX)
1d00a4eb 2345 return -EINVAL;
1da177e4
LT		 2346
2347 type -= XFRM_MSG_BASE;
2348 link = &xfrm_dispatch[type];
2349
2350 /* All operations require privileges, even GET */
fd778461 2351 if (!capable(CAP_NET_ADMIN))
1d00a4eb 2352 return -EPERM;
1da177e4 2353
492b558b
TG		 2354 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2355 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2356 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2357 if (link->dump == NULL)
1d00a4eb 2358 return -EINVAL;
88fc2c84 2359
80d326fa
PNA		 2360 {
2361 struct netlink_dump_control c = {
2362 .dump = link->dump,
2363 .done = link->done,
2364 };
2365 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2366 }
1da177e4
LT		 2367 }
2368
35a7aa08 2369 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 2370 xfrma_policy);
a7bd9a45
TG		 2371 if (err < 0)
2372 return err;
1da177e4
LT		 2373
2374 if (link->doit == NULL)
1d00a4eb 2375 return -EINVAL;
1da177e4 2376
5424f32e 2377 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2378}
2379
cd40b7d3 2380static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2381{
cd40b7d3
DL		 2382 mutex_lock(&xfrm_cfg_mutex);
2383 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2384 mutex_unlock(&xfrm_cfg_mutex);
1da177e4
LT		 2385}
2386
7deb2264
TG		 2387static inline size_t xfrm_expire_msgsize(void)
2388{
6f26b61e
JHS		 2389 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2390 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2391}
2392
214e005b 2393static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2394{
2395 struct xfrm_user_expire *ue;
2396 struct nlmsghdr *nlh;
1d1e34dd 2397 int err;
1da177e4 2398
79b8b7f4
TG		 2399 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2400 if (nlh == NULL)
2401 return -EMSGSIZE;
1da177e4 2402
7b67c857 2403 ue = nlmsg_data(nlh);
1da177e4 2404 copy_to_user_state(x, &ue->state);
d51d081d 2405 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2406
1d1e34dd
DM		 2407 err = xfrm_mark_put(skb, &x->mark);
2408 if (err)
2409 return err;
6f26b61e 2410
9825069d 2411 return nlmsg_end(skb, nlh);
1da177e4
LT		 2412}
2413
214e005b 2414static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2415{
fc34acd3 2416 struct net *net = xs_net(x);
1da177e4
LT		 2417 struct sk_buff *skb;
2418
7deb2264 2419 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2420 if (skb == NULL)
2421 return -ENOMEM;
2422
6f26b61e
JHS		 2423 if (build_expire(skb, x, c) < 0) {
2424 kfree_skb(skb);
2425 return -EMSGSIZE;
2426 }
1da177e4 2427
a6483b79 2428 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2429}
2430
214e005b 2431static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2432{
fc34acd3 2433 struct net *net = xs_net(x);
d51d081d 2434 struct sk_buff *skb;
d51d081d 2435
d8647b79 2436 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2437 if (skb == NULL)
2438 return -ENOMEM;
2439
2440 if (build_aevent(skb, x, c) < 0)
2441 BUG();
2442
a6483b79 2443 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
d51d081d
JHS		 2444}
2445
214e005b 2446static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2447{
7067802e 2448 struct net *net = c->net;
26b15dad
JHS		 2449 struct xfrm_usersa_flush *p;
2450 struct nlmsghdr *nlh;
2451 struct sk_buff *skb;
7deb2264 2452 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2453
7deb2264 2454 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2455 if (skb == NULL)
2456 return -ENOMEM;
26b15dad 2457
79b8b7f4
TG		 2458 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2459 if (nlh == NULL) {
2460 kfree_skb(skb);
2461 return -EMSGSIZE;
2462 }
26b15dad 2463
7b67c857 2464 p = nlmsg_data(nlh);
bf08867f 2465 p->proto = c->data.proto;
26b15dad 2466
9825069d 2467 nlmsg_end(skb, nlh);
26b15dad 2468
a6483b79 2469 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2470}
2471
7deb2264 2472static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2473{
7deb2264 2474 size_t l = 0;
1a6509d9
HX		 2475 if (x->aead)
2476 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2477 if (x->aalg) {
2478 l += nla_total_size(sizeof(struct xfrm_algo) +
2479 (x->aalg->alg_key_len + 7) / 8);
2480 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2481 }
26b15dad 2482 if (x->ealg)
0f99be0d 2483 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2484 if (x->calg)
7deb2264 2485 l += nla_total_size(sizeof(*x->calg));
26b15dad 2486 if (x->encap)
7deb2264 2487 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2488 if (x->tfcpad)
2489 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2490 if (x->replay_esn)
2491 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
68325d3b
HX		 2492 if (x->security)
2493 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2494 x->security->ctx_len);
2495 if (x->coaddr)
2496 l += nla_total_size(sizeof(*x->coaddr));
2497
d26f3984
HX		 2498 /* Must count x->lastused as it may become non-zero behind our back. */
2499 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2500
2501 return l;
2502}
2503
214e005b 2504static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2505{
fc34acd3 2506 struct net *net = xs_net(x);
26b15dad 2507 struct xfrm_usersa_info *p;
0603eac0 2508 struct xfrm_usersa_id *id;
26b15dad
JHS		 2509 struct nlmsghdr *nlh;
2510 struct sk_buff *skb;
26b15dad 2511 int len = xfrm_sa_len(x);
1d1e34dd 2512 int headlen, err;
0603eac0
HX		 2513
2514 headlen = sizeof(*p);
2515 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2516 len += nla_total_size(headlen);
0603eac0 2517 headlen = sizeof(*id);
6f26b61e 2518 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2519 }
7deb2264 2520 len += NLMSG_ALIGN(headlen);
26b15dad 2521
7deb2264 2522 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2523 if (skb == NULL)
2524 return -ENOMEM;
26b15dad 2525
79b8b7f4 2526 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
1d1e34dd 2527 err = -EMSGSIZE;
79b8b7f4 2528 if (nlh == NULL)
1d1e34dd 2529 goto out_free_skb;
26b15dad 2530
7b67c857 2531 p = nlmsg_data(nlh);
0603eac0 2532 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2533 struct nlattr *attr;
2534
7b67c857 2535 id = nlmsg_data(nlh);
0603eac0
HX		 2536 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2537 id->spi = x->id.spi;
2538 id->family = x->props.family;
2539 id->proto = x->id.proto;
2540
c0144bea 2541 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2542 err = -EMSGSIZE;
c0144bea 2543 if (attr == NULL)
1d1e34dd 2544 goto out_free_skb;
c0144bea
TG		 2545
2546 p = nla_data(attr);
0603eac0 2547 }
1d1e34dd
DM		 2548 err = copy_to_user_state_extra(x, p, skb);
2549 if (err)
2550 goto out_free_skb;
26b15dad 2551
9825069d 2552 nlmsg_end(skb, nlh);
26b15dad 2553
a6483b79 2554 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad 2555
1d1e34dd 2556out_free_skb:
26b15dad 2557 kfree_skb(skb);
1d1e34dd 2558 return err;
26b15dad
JHS		 2559}
2560
214e005b 2561static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2562{
2563
2564 switch (c->event) {
f60f6b8f 2565 case XFRM_MSG_EXPIRE:
26b15dad 2566 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2567 case XFRM_MSG_NEWAE:
2568 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2569 case XFRM_MSG_DELSA:
2570 case XFRM_MSG_UPDSA:
2571 case XFRM_MSG_NEWSA:
26b15dad 2572 return xfrm_notify_sa(x, c);
f60f6b8f 2573 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2574 return xfrm_notify_sa_flush(c);
2575 default:
62db5cfd 2576 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2577 c->event);
2578 break;
26b15dad
JHS		 2579 }
2580
2581 return 0;
2582
2583}
2584
7deb2264
TG		 2585static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2586 struct xfrm_policy *xp)
2587{
2588 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2589 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2590 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2591 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2592 + userpolicy_type_attrsize();
2593}
2594
1da177e4
LT		 2595static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2596 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2597 int dir)
2598{
1d1e34dd 2599 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2600 struct xfrm_user_acquire *ua;
2601 struct nlmsghdr *nlh;
1d1e34dd 2602 int err;
1da177e4 2603
79b8b7f4
TG		 2604 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2605 if (nlh == NULL)
2606 return -EMSGSIZE;
1da177e4 2607
7b67c857 2608 ua = nlmsg_data(nlh);
1da177e4
LT		 2609 memcpy(&ua->id, &x->id, sizeof(ua->id));
2610 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2611 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2612 copy_to_user_policy(xp, &ua->policy, dir);
2613 ua->aalgos = xt->aalgos;
2614 ua->ealgos = xt->ealgos;
2615 ua->calgos = xt->calgos;
2616 ua->seq = x->km.seq = seq;
2617
1d1e34dd
DM		 2618 err = copy_to_user_tmpl(xp, skb);
2619 if (!err)
2620 err = copy_to_user_state_sec_ctx(x, skb);
2621 if (!err)
2622 err = copy_to_user_policy_type(xp->type, skb);
2623 if (!err)
2624 err = xfrm_mark_put(skb, &xp->mark);
2625 if (err) {
2626 nlmsg_cancel(skb, nlh);
2627 return err;
2628 }
1da177e4 2629
9825069d 2630 return nlmsg_end(skb, nlh);
1da177e4
LT		 2631}
2632
2633static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2634 struct xfrm_policy *xp, int dir)
2635{
a6483b79 2636 struct net *net = xs_net(x);
1da177e4 2637 struct sk_buff *skb;
1da177e4 2638
7deb2264 2639 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2640 if (skb == NULL)
2641 return -ENOMEM;
2642
2643 if (build_acquire(skb, x, xt, xp, dir) < 0)
2644 BUG();
2645
a6483b79 2646 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2647}
2648
2649/* User gives us xfrm_user_policy_info followed by an array of 0
2650 * or more templates.
2651 */
cb969f07 2652static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2653 u8 *data, int len, int *dir)
2654{
fc34acd3 2655 struct net *net = sock_net(sk);
1da177e4
LT		 2656 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2657 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2658 struct xfrm_policy *xp;
2659 int nr;
2660
cb969f07 2661 switch (sk->sk_family) {
1da177e4
LT		 2662 case AF_INET:
2663 if (opt != IP_XFRM_POLICY) {
2664 *dir = -EOPNOTSUPP;
2665 return NULL;
2666 }
2667 break;
dfd56b8b 2668#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2669 case AF_INET6:
2670 if (opt != IPV6_XFRM_POLICY) {
2671 *dir = -EOPNOTSUPP;
2672 return NULL;
2673 }
2674 break;
2675#endif
2676 default:
2677 *dir = -EINVAL;
2678 return NULL;
2679 }
2680
2681 *dir = -EINVAL;
2682
2683 if (len < sizeof(*p) ||
2684 verify_newpolicy_info(p))
2685 return NULL;
2686
2687 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2688 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2689 return NULL;
2690
a4f1bac6
HX		 2691 if (p->dir > XFRM_POLICY_OUT)
2692 return NULL;
2693
2f09a4d5 2694 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2695 if (xp == NULL) {
2696 *dir = -ENOBUFS;
2697 return NULL;
2698 }
2699
2700 copy_from_user_policy(xp, p);
f7b6983f 2701 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2702 copy_templates(xp, ut, nr);
2703
2704 *dir = p->dir;
2705
2706 return xp;
2707}
2708
7deb2264
TG		 2709static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2710{
2711 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2712 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2713 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2714 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2715 + userpolicy_type_attrsize();
2716}
2717
1da177e4 2718static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2719 int dir, const struct km_event *c)
1da177e4
LT		 2720{
2721 struct xfrm_user_polexpire *upe;
d51d081d 2722 int hard = c->data.hard;
1d1e34dd
DM		 2723 struct nlmsghdr *nlh;
2724 int err;
1da177e4 2725
79b8b7f4
TG		 2726 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2727 if (nlh == NULL)
2728 return -EMSGSIZE;
1da177e4 2729
7b67c857 2730 upe = nlmsg_data(nlh);
1da177e4 2731 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2732 err = copy_to_user_tmpl(xp, skb);
2733 if (!err)
2734 err = copy_to_user_sec_ctx(xp, skb);
2735 if (!err)
2736 err = copy_to_user_policy_type(xp->type, skb);
2737 if (!err)
2738 err = xfrm_mark_put(skb, &xp->mark);
2739 if (err) {
2740 nlmsg_cancel(skb, nlh);
2741 return err;
2742 }
1da177e4
LT		 2743 upe->hard = !!hard;
2744
9825069d 2745 return nlmsg_end(skb, nlh);
1da177e4
LT		 2746}
2747
214e005b 2748static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2749{
fc34acd3 2750 struct net *net = xp_net(xp);
1da177e4 2751 struct sk_buff *skb;
1da177e4 2752
7deb2264 2753 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2754 if (skb == NULL)
2755 return -ENOMEM;
2756
d51d081d 2757 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2758 BUG();
2759
a6483b79 2760 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2761}
2762
214e005b 2763static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2764{
1d1e34dd 2765 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2766 struct net *net = xp_net(xp);
26b15dad 2767 struct xfrm_userpolicy_info *p;
0603eac0 2768 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2769 struct nlmsghdr *nlh;
2770 struct sk_buff *skb;
1d1e34dd 2771 int headlen, err;
0603eac0
HX		 2772
2773 headlen = sizeof(*p);
2774 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2775 len += nla_total_size(headlen);
0603eac0
HX		 2776 headlen = sizeof(*id);
2777 }
cfbfd45a 2778 len += userpolicy_type_attrsize();
295fae56 2779 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2780 len += NLMSG_ALIGN(headlen);
26b15dad 2781
7deb2264 2782 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2783 if (skb == NULL)
2784 return -ENOMEM;
26b15dad 2785
79b8b7f4 2786 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
1d1e34dd 2787 err = -EMSGSIZE;
79b8b7f4 2788 if (nlh == NULL)
1d1e34dd 2789 goto out_free_skb;
26b15dad 2790
7b67c857 2791 p = nlmsg_data(nlh);
0603eac0 2792 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2793 struct nlattr *attr;
2794
7b67c857 2795 id = nlmsg_data(nlh);
0603eac0
HX		 2796 memset(id, 0, sizeof(*id));
2797 id->dir = dir;
2798 if (c->data.byid)
2799 id->index = xp->index;
2800 else
2801 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2802
c0144bea 2803 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2804 err = -EMSGSIZE;
c0144bea 2805 if (attr == NULL)
1d1e34dd 2806 goto out_free_skb;
c0144bea
TG		 2807
2808 p = nla_data(attr);
0603eac0 2809 }
26b15dad 2810
26b15dad 2811 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2812 err = copy_to_user_tmpl(xp, skb);
2813 if (!err)
2814 err = copy_to_user_policy_type(xp->type, skb);
2815 if (!err)
2816 err = xfrm_mark_put(skb, &xp->mark);
2817 if (err)
2818 goto out_free_skb;
295fae56 2819
9825069d 2820 nlmsg_end(skb, nlh);
26b15dad 2821
a6483b79 2822 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2823
1d1e34dd 2824out_free_skb:
26b15dad 2825 kfree_skb(skb);
1d1e34dd 2826 return err;
26b15dad
JHS		 2827}
2828
214e005b 2829static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2830{
7067802e 2831 struct net *net = c->net;
26b15dad
JHS		 2832 struct nlmsghdr *nlh;
2833 struct sk_buff *skb;
1d1e34dd 2834 int err;
26b15dad 2835
7deb2264 2836 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2837 if (skb == NULL)
2838 return -ENOMEM;
26b15dad 2839
79b8b7f4 2840 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2841 err = -EMSGSIZE;
79b8b7f4 2842 if (nlh == NULL)
1d1e34dd
DM		 2843 goto out_free_skb;
2844 err = copy_to_user_policy_type(c->data.type, skb);
2845 if (err)
2846 goto out_free_skb;
26b15dad 2847
9825069d 2848 nlmsg_end(skb, nlh);
26b15dad 2849
a6483b79 2850 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2851
1d1e34dd 2852out_free_skb:
26b15dad 2853 kfree_skb(skb);
1d1e34dd 2854 return err;
26b15dad
JHS		 2855}
2856
214e005b 2857static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2858{
2859
2860 switch (c->event) {
f60f6b8f
HX		 2861 case XFRM_MSG_NEWPOLICY:
2862 case XFRM_MSG_UPDPOLICY:
2863 case XFRM_MSG_DELPOLICY:
26b15dad 2864 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2865 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2866 return xfrm_notify_policy_flush(c);
f60f6b8f 2867 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2868 return xfrm_exp_policy_notify(xp, dir, c);
2869 default:
62db5cfd 2870 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2871 c->event);
26b15dad
JHS		 2872 }
2873
2874 return 0;
2875
2876}
2877
7deb2264
TG		 2878static inline size_t xfrm_report_msgsize(void)
2879{
2880 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2881}
2882
97a64b45
MN		 2883static int build_report(struct sk_buff *skb, u8 proto,
2884 struct xfrm_selector *sel, xfrm_address_t *addr)
2885{
2886 struct xfrm_user_report *ur;
2887 struct nlmsghdr *nlh;
97a64b45 2888
79b8b7f4
TG		 2889 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2890 if (nlh == NULL)
2891 return -EMSGSIZE;
97a64b45 2892
7b67c857 2893 ur = nlmsg_data(nlh);
97a64b45
MN		 2894 ur->proto = proto;
2895 memcpy(&ur->sel, sel, sizeof(ur->sel));
2896
1d1e34dd
DM		 2897 if (addr) {
2898 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2899 if (err) {
2900 nlmsg_cancel(skb, nlh);
2901 return err;
2902 }
2903 }
9825069d 2904 return nlmsg_end(skb, nlh);
97a64b45
MN		 2905}
2906
db983c11
AD		 2907static int xfrm_send_report(struct net *net, u8 proto,
2908 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2909{
2910 struct sk_buff *skb;
97a64b45 2911
7deb2264 2912 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2913 if (skb == NULL)
2914 return -ENOMEM;
2915
2916 if (build_report(skb, proto, sel, addr) < 0)
2917 BUG();
2918
a6483b79 2919 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
97a64b45
MN		 2920}
2921
3a2dfbe8
MW		 2922static inline size_t xfrm_mapping_msgsize(void)
2923{
2924 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2925}
2926
2927static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2928 xfrm_address_t *new_saddr, __be16 new_sport)
2929{
2930 struct xfrm_user_mapping *um;
2931 struct nlmsghdr *nlh;
2932
2933 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2934 if (nlh == NULL)
2935 return -EMSGSIZE;
2936
2937 um = nlmsg_data(nlh);
2938
2939 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2940 um->id.spi = x->id.spi;
2941 um->id.family = x->props.family;
2942 um->id.proto = x->id.proto;
2943 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2944 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2945 um->new_sport = new_sport;
2946 um->old_sport = x->encap->encap_sport;
2947 um->reqid = x->props.reqid;
2948
2949 return nlmsg_end(skb, nlh);
2950}
2951
2952static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2953 __be16 sport)
2954{
a6483b79 2955 struct net *net = xs_net(x);
3a2dfbe8
MW		 2956 struct sk_buff *skb;
2957
2958 if (x->id.proto != IPPROTO_ESP)
2959 return -EINVAL;
2960
2961 if (!x->encap)
2962 return -EINVAL;
2963
2964 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2965 if (skb == NULL)
2966 return -ENOMEM;
2967
2968 if (build_mapping(skb, x, ipaddr, sport) < 0)
2969 BUG();
2970
a6483b79 2971 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
3a2dfbe8
MW		 2972}
2973
1da177e4
LT		 2974static struct xfrm_mgr netlink_mgr = {
2975 .id = "netlink",
2976 .notify = xfrm_send_state_notify,
2977 .acquire = xfrm_send_acquire,
2978 .compile_policy = xfrm_compile_policy,
2979 .notify_policy = xfrm_send_policy_notify,
97a64b45 2980 .report = xfrm_send_report,
5c79de6e 2981 .migrate = xfrm_send_migrate,
3a2dfbe8 2982 .new_mapping = xfrm_send_mapping,
1da177e4
LT		 2983};
2984
a6483b79 2985static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 2986{
be33690d 2987 struct sock *nlsk;
a31f2d17
PNA		 2988 struct netlink_kernel_cfg cfg = {
2989 .groups = XFRMNLGRP_MAX,
2990 .input = xfrm_netlink_rcv,
2991 };
be33690d 2992
a31f2d17 2993 nlsk = netlink_kernel_create(net, NETLINK_XFRM, THIS_MODULE, &cfg);
be33690d 2994 if (nlsk == NULL)
1da177e4 2995 return -ENOMEM;
d79d792e 2996 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 2997 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 2998 return 0;
2999}
3000
d79d792e 3001static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 3002{
d79d792e
EB		 3003 struct net *net;
3004 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 3005 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 3006 synchronize_net();
3007 list_for_each_entry(net, net_exit_list, exit_list)
3008 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 3009}
3010
a6483b79 3011static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 3012 .init = xfrm_user_net_init,
3013 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 3014};
3015
3016static int __init xfrm_user_init(void)
3017{
3018 int rv;
3019
3020 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3021
3022 rv = register_pernet_subsys(&xfrm_user_net_ops);
3023 if (rv < 0)
3024 return rv;
3025 rv = xfrm_register_km(&netlink_mgr);
3026 if (rv < 0)
3027 unregister_pernet_subsys(&xfrm_user_net_ops);
3028 return rv;
3029}
3030
3031static void __exit xfrm_user_exit(void)
3032{
3033 xfrm_unregister_km(&netlink_mgr);
3034 unregister_pernet_subsys(&xfrm_user_net_ops);
3035}
3036
1da177e4
LT		 3037module_init(xfrm_user_init);
3038module_exit(xfrm_user_exit);
3039MODULE_LICENSE("GPL");
4fdb3bb7 3040MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3041
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