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