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Merge branch 'neigh_cleanups'
[mirror_ubuntu-hirsute-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
5424f32e 35static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 36{
5424f32e 37 struct nlattr *rt = attrs[type];
1da177e4
LT		 38 struct xfrm_algo *algp;
39
40 if (!rt)
41 return 0;
42
5424f32e 43 algp = nla_data(rt);
0f99be0d 44 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 45 return -EINVAL;
46
1da177e4
LT		 47 switch (type) {
48 case XFRMA_ALG_AUTH:
1da177e4 49 case XFRMA_ALG_CRYPT:
1da177e4 50 case XFRMA_ALG_COMP:
1da177e4
LT		 51 break;
52
53 default:
54 return -EINVAL;
3ff50b79 55 }
1da177e4
LT		 56
57 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
58 return 0;
59}
60
4447bb33
MW		 61static int verify_auth_trunc(struct nlattr **attrs)
62{
63 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
64 struct xfrm_algo_auth *algp;
65
66 if (!rt)
67 return 0;
68
69 algp = nla_data(rt);
70 if (nla_len(rt) < xfrm_alg_auth_len(algp))
71 return -EINVAL;
72
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 return 0;
75}
76
1a6509d9
HX		 77static int verify_aead(struct nlattr **attrs)
78{
79 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
80 struct xfrm_algo_aead *algp;
81
82 if (!rt)
83 return 0;
84
85 algp = nla_data(rt);
86 if (nla_len(rt) < aead_len(algp))
87 return -EINVAL;
88
89 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
90 return 0;
91}
92
5424f32e 93static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 94 xfrm_address_t **addrp)
95{
5424f32e 96 struct nlattr *rt = attrs[type];
eb2971b6 97
cf5cb79f 98 if (rt && addrp)
5424f32e 99 *addrp = nla_data(rt);
eb2971b6 100}
df71837d 101
5424f32e 102static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 103{
5424f32e 104 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 105 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 106
107 if (!rt)
108 return 0;
109
5424f32e 110 uctx = nla_data(rt);
cf5cb79f 111 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 112 return -EINVAL;
113
114 return 0;
115}
116
d8647b79
SK		 117static inline int verify_replay(struct xfrm_usersa_info *p,
118 struct nlattr **attrs)
119{
120 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
ecd79187 121 struct xfrm_replay_state_esn *rs;
d8647b79 122
ecd79187
MK		 123 if (p->flags & XFRM_STATE_ESN) {
124 if (!rt)
125 return -EINVAL;
126
127 rs = nla_data(rt);
128
129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 return -EINVAL;
131
132 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133 nla_len(rt) != sizeof(*rs))
134 return -EINVAL;
135 }
7833aa05 136
d8647b79
SK		 137 if (!rt)
138 return 0;
139
01714109
FD		 140 /* As only ESP and AH support ESN feature. */
141 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
02aadf72
SK		 142 return -EINVAL;
143
d8647b79
SK		 144 if (p->replay_window != 0)
145 return -EINVAL;
146
147 return 0;
148}
df71837d 149
1da177e4 150static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 151 struct nlattr **attrs)
1da177e4
LT		 152{
153 int err;
154
155 err = -EINVAL;
156 switch (p->family) {
157 case AF_INET:
158 break;
159
160 case AF_INET6:
dfd56b8b 161#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 162 break;
163#else
164 err = -EAFNOSUPPORT;
165 goto out;
166#endif
167
168 default:
169 goto out;
3ff50b79 170 }
1da177e4
LT		 171
172 err = -EINVAL;
173 switch (p->id.proto) {
174 case IPPROTO_AH:
4447bb33
MW		 175 if ((!attrs[XFRMA_ALG_AUTH] &&
176 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 177 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 178 attrs[XFRMA_ALG_CRYPT] ||
35d2856b 179 attrs[XFRMA_ALG_COMP] ||
a0e5ef53 180 attrs[XFRMA_TFCPAD])
1da177e4
LT		 181 goto out;
182 break;
183
184 case IPPROTO_ESP:
1a6509d9
HX		 185 if (attrs[XFRMA_ALG_COMP])
186 goto out;
187 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 188 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 189 !attrs[XFRMA_ALG_CRYPT] &&
190 !attrs[XFRMA_ALG_AEAD])
191 goto out;
192 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 193 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 194 attrs[XFRMA_ALG_CRYPT]) &&
195 attrs[XFRMA_ALG_AEAD])
1da177e4 196 goto out;
35d2856b
MW		 197 if (attrs[XFRMA_TFCPAD] &&
198 p->mode != XFRM_MODE_TUNNEL)
199 goto out;
1da177e4
LT		 200 break;
201
202 case IPPROTO_COMP:
35a7aa08 203 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 204 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 205 attrs[XFRMA_ALG_AUTH] ||
4447bb33 206 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b 207 attrs[XFRMA_ALG_CRYPT] ||
a0e5ef53
TB		 208 attrs[XFRMA_TFCPAD] ||
209 (ntohl(p->id.spi) >= 0x10000))
1da177e4
LT		 210 goto out;
211 break;
212
dfd56b8b 213#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 214 case IPPROTO_DSTOPTS:
215 case IPPROTO_ROUTING:
35a7aa08
TG		 216 if (attrs[XFRMA_ALG_COMP] ||
217 attrs[XFRMA_ALG_AUTH] ||
4447bb33 218 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9 219 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 220 attrs[XFRMA_ALG_CRYPT] ||
221 attrs[XFRMA_ENCAP] ||
222 attrs[XFRMA_SEC_CTX] ||
35d2856b 223 attrs[XFRMA_TFCPAD] ||
35a7aa08 224 !attrs[XFRMA_COADDR])
e23c7194
MN		 225 goto out;
226 break;
227#endif
228
1da177e4
LT		 229 default:
230 goto out;
3ff50b79 231 }
1da177e4 232
1a6509d9
HX		 233 if ((err = verify_aead(attrs)))
234 goto out;
4447bb33
MW		 235 if ((err = verify_auth_trunc(attrs)))
236 goto out;
35a7aa08 237 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 238 goto out;
35a7aa08 239 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 240 goto out;
35a7aa08 241 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 242 goto out;
35a7aa08 243 if ((err = verify_sec_ctx_len(attrs)))
df71837d 244 goto out;
d8647b79
SK		 245 if ((err = verify_replay(p, attrs)))
246 goto out;
1da177e4
LT		 247
248 err = -EINVAL;
249 switch (p->mode) {
7e49e6de
MN		 250 case XFRM_MODE_TRANSPORT:
251 case XFRM_MODE_TUNNEL:
060f02a3 252 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 253 case XFRM_MODE_BEET:
1da177e4
LT		 254 break;
255
256 default:
257 goto out;
3ff50b79 258 }
1da177e4
LT		 259
260 err = 0;
261
262out:
263 return err;
264}
265
266static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
6f2f19ed 267 struct xfrm_algo_desc *(*get_byname)(const char *, int),
5424f32e 268 struct nlattr *rta)
1da177e4 269{
1da177e4
LT		 270 struct xfrm_algo *p, *ualg;
271 struct xfrm_algo_desc *algo;
272
273 if (!rta)
274 return 0;
275
5424f32e 276 ualg = nla_data(rta);
1da177e4
LT		 277
278 algo = get_byname(ualg->alg_name, 1);
279 if (!algo)
280 return -ENOSYS;
281 *props = algo->desc.sadb_alg_id;
282
0f99be0d 283 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 284 if (!p)
285 return -ENOMEM;
286
04ff1260 287 strcpy(p->alg_name, algo->name);
1da177e4
LT		 288 *algpp = p;
289 return 0;
290}
291
4447bb33
MW		 292static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
293 struct nlattr *rta)
294{
295 struct xfrm_algo *ualg;
296 struct xfrm_algo_auth *p;
297 struct xfrm_algo_desc *algo;
298
299 if (!rta)
300 return 0;
301
302 ualg = nla_data(rta);
303
304 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
305 if (!algo)
306 return -ENOSYS;
307 *props = algo->desc.sadb_alg_id;
308
309 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
310 if (!p)
311 return -ENOMEM;
312
313 strcpy(p->alg_name, algo->name);
314 p->alg_key_len = ualg->alg_key_len;
315 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
316 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
317
318 *algpp = p;
319 return 0;
320}
321
322static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
323 struct nlattr *rta)
324{
325 struct xfrm_algo_auth *p, *ualg;
326 struct xfrm_algo_desc *algo;
327
328 if (!rta)
329 return 0;
330
331 ualg = nla_data(rta);
332
333 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
334 if (!algo)
335 return -ENOSYS;
689f1c9d 336 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 337 return -EINVAL;
338 *props = algo->desc.sadb_alg_id;
339
340 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
341 if (!p)
342 return -ENOMEM;
343
344 strcpy(p->alg_name, algo->name);
345 if (!p->alg_trunc_len)
346 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
347
348 *algpp = p;
349 return 0;
350}
351
1a6509d9
HX		 352static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
353 struct nlattr *rta)
354{
355 struct xfrm_algo_aead *p, *ualg;
356 struct xfrm_algo_desc *algo;
357
358 if (!rta)
359 return 0;
360
361 ualg = nla_data(rta);
362
363 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
364 if (!algo)
365 return -ENOSYS;
366 *props = algo->desc.sadb_alg_id;
367
368 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
369 if (!p)
370 return -ENOMEM;
371
372 strcpy(p->alg_name, algo->name);
373 *algpp = p;
374 return 0;
375}
376
e2b19125
SK		 377static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
378 struct nlattr *rp)
379{
380 struct xfrm_replay_state_esn *up;
ecd79187 381 int ulen;
e2b19125
SK		 382
383 if (!replay_esn || !rp)
384 return 0;
385
386 up = nla_data(rp);
ecd79187 387 ulen = xfrm_replay_state_esn_len(up);
e2b19125 388
ecd79187 389 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
e2b19125
SK		 390 return -EINVAL;
391
392 return 0;
393}
394
d8647b79
SK		 395static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
396 struct xfrm_replay_state_esn **preplay_esn,
397 struct nlattr *rta)
398{
399 struct xfrm_replay_state_esn *p, *pp, *up;
ecd79187 400 int klen, ulen;
d8647b79
SK		 401
402 if (!rta)
403 return 0;
404
405 up = nla_data(rta);
ecd79187
MK		 406 klen = xfrm_replay_state_esn_len(up);
407 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
d8647b79 408
ecd79187 409 p = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 410 if (!p)
411 return -ENOMEM;
412
ecd79187 413 pp = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 414 if (!pp) {
415 kfree(p);
416 return -ENOMEM;
417 }
418
ecd79187
MK		 419 memcpy(p, up, ulen);
420 memcpy(pp, up, ulen);
421
d8647b79
SK		 422 *replay_esn = p;
423 *preplay_esn = pp;
424
425 return 0;
426}
427
661697f7 428static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 429{
df71837d
TJ		 430 int len = 0;
431
432 if (xfrm_ctx) {
433 len += sizeof(struct xfrm_user_sec_ctx);
434 len += xfrm_ctx->ctx_len;
435 }
436 return len;
437}
438
1da177e4
LT		 439static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
440{
441 memcpy(&x->id, &p->id, sizeof(x->id));
442 memcpy(&x->sel, &p->sel, sizeof(x->sel));
443 memcpy(&x->lft, &p->lft, sizeof(x->lft));
444 x->props.mode = p->mode;
33fce60d
FD		 445 x->props.replay_window = min_t(unsigned int, p->replay_window,
446 sizeof(x->replay.bitmap) * 8);
1da177e4
LT		 447 x->props.reqid = p->reqid;
448 x->props.family = p->family;
54489c14 449 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 450 x->props.flags = p->flags;
196b0036 451
ccf9b3b8 452 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 453 x->sel.family = p->family;
1da177e4
LT		 454}
455
d51d081d
JHS		 456/*
457 * someday when pfkey also has support, we could have the code
458 * somehow made shareable and move it to xfrm_state.c - JHS
459 *
460*/
e3ac104d
MK		 461static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
462 int update_esn)
d51d081d 463{
5424f32e 464 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
e3ac104d 465 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
5424f32e
TG		 466 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
467 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
468 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 469
d8647b79
SK		 470 if (re) {
471 struct xfrm_replay_state_esn *replay_esn;
472 replay_esn = nla_data(re);
473 memcpy(x->replay_esn, replay_esn,
474 xfrm_replay_state_esn_len(replay_esn));
475 memcpy(x->preplay_esn, replay_esn,
476 xfrm_replay_state_esn_len(replay_esn));
477 }
478
d51d081d
JHS		 479 if (rp) {
480 struct xfrm_replay_state *replay;
5424f32e 481 replay = nla_data(rp);
d51d081d
JHS		 482 memcpy(&x->replay, replay, sizeof(*replay));
483 memcpy(&x->preplay, replay, sizeof(*replay));
484 }
485
486 if (lt) {
487 struct xfrm_lifetime_cur *ltime;
5424f32e 488 ltime = nla_data(lt);
d51d081d
JHS		 489 x->curlft.bytes = ltime->bytes;
490 x->curlft.packets = ltime->packets;
491 x->curlft.add_time = ltime->add_time;
492 x->curlft.use_time = ltime->use_time;
493 }
494
cf5cb79f 495 if (et)
5424f32e 496 x->replay_maxage = nla_get_u32(et);
d51d081d 497
cf5cb79f 498 if (rt)
5424f32e 499 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 500}
501
fc34acd3
AD		 502static struct xfrm_state *xfrm_state_construct(struct net *net,
503 struct xfrm_usersa_info *p,
5424f32e 504 struct nlattr **attrs,
1da177e4
LT		 505 int *errp)
506{
fc34acd3 507 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 508 int err = -ENOMEM;
509
510 if (!x)
511 goto error_no_put;
512
513 copy_from_user_state(x, p);
514
a947b0a9
ND		 515 if (attrs[XFRMA_SA_EXTRA_FLAGS])
516 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
517
1a6509d9
HX		 518 if ((err = attach_aead(&x->aead, &x->props.ealgo,
519 attrs[XFRMA_ALG_AEAD])))
520 goto error;
4447bb33
MW		 521 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
522 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 523 goto error;
4447bb33
MW		 524 if (!x->props.aalgo) {
525 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
526 attrs[XFRMA_ALG_AUTH])))
527 goto error;
528 }
1da177e4
LT		 529 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
530 xfrm_ealg_get_byname,
35a7aa08 531 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 532 goto error;
533 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
534 xfrm_calg_get_byname,
35a7aa08 535 attrs[XFRMA_ALG_COMP])))
1da177e4 536 goto error;
fd21150a
TG		 537
538 if (attrs[XFRMA_ENCAP]) {
539 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
540 sizeof(*x->encap), GFP_KERNEL);
541 if (x->encap == NULL)
542 goto error;
543 }
544
35d2856b
MW		 545 if (attrs[XFRMA_TFCPAD])
546 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
547
fd21150a
TG		 548 if (attrs[XFRMA_COADDR]) {
549 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
550 sizeof(*x->coaddr), GFP_KERNEL);
551 if (x->coaddr == NULL)
552 goto error;
553 }
554
6f26b61e
JHS		 555 xfrm_mark_get(attrs, &x->mark);
556
a454f0cc 557 err = __xfrm_init_state(x, false);
1da177e4
LT		 558 if (err)
559 goto error;
560
fd21150a
TG		 561 if (attrs[XFRMA_SEC_CTX] &&
562 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 563 goto error;
564
d8647b79
SK		 565 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
566 attrs[XFRMA_REPLAY_ESN_VAL])))
567 goto error;
568
1da177e4 569 x->km.seq = p->seq;
b27aeadb 570 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 571 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 572 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 573
9fdc4883
SK		 574 if ((err = xfrm_init_replay(x)))
575 goto error;
d51d081d 576
9fdc4883 577 /* override default values from above */
e3ac104d 578 xfrm_update_ae_params(x, attrs, 0);
1da177e4
LT		 579
580 return x;
581
582error:
583 x->km.state = XFRM_STATE_DEAD;
584 xfrm_state_put(x);
585error_no_put:
586 *errp = err;
587 return NULL;
588}
589
22e70050 590static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 591 struct nlattr **attrs)
1da177e4 592{
fc34acd3 593 struct net *net = sock_net(skb->sk);
7b67c857 594 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 595 struct xfrm_state *x;
596 int err;
26b15dad 597 struct km_event c;
1da177e4 598
35a7aa08 599 err = verify_newsa_info(p, attrs);
1da177e4
LT		 600 if (err)
601 return err;
602
fc34acd3 603 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 604 if (!x)
605 return err;
606
26b15dad 607 xfrm_state_hold(x);
1da177e4
LT		 608 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
609 err = xfrm_state_add(x);
610 else
611 err = xfrm_state_update(x);
612
2e71029e 613 xfrm_audit_state_add(x, err ? 0 : 1, true);
161a09e7 614
1da177e4
LT		 615 if (err < 0) {
616 x->km.state = XFRM_STATE_DEAD;
21380b81 617 __xfrm_state_put(x);
7d6dfe1f 618 goto out;
1da177e4
LT		 619 }
620
26b15dad 621 c.seq = nlh->nlmsg_seq;
15e47304 622 c.portid = nlh->nlmsg_pid;
f60f6b8f 623 c.event = nlh->nlmsg_type;
26b15dad
JHS		 624
625 km_state_notify(x, &c);
7d6dfe1f 626out:
26b15dad 627 xfrm_state_put(x);
1da177e4
LT		 628 return err;
629}
630
fc34acd3
AD		 631static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
632 struct xfrm_usersa_id *p,
5424f32e 633 struct nlattr **attrs,
eb2971b6
MN		 634 int *errp)
635{
636 struct xfrm_state *x = NULL;
6f26b61e 637 struct xfrm_mark m;
eb2971b6 638 int err;
6f26b61e 639 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 640
641 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
642 err = -ESRCH;
6f26b61e 643 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 644 } else {
645 xfrm_address_t *saddr = NULL;
646
35a7aa08 647 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 648 if (!saddr) {
649 err = -EINVAL;
650 goto out;
651 }
652
9abbffee 653 err = -ESRCH;
6f26b61e
JHS		 654 x = xfrm_state_lookup_byaddr(net, mark,
655 &p->daddr, saddr,
221df1ed 656 p->proto, p->family);
eb2971b6
MN		 657 }
658
659 out:
660 if (!x && errp)
661 *errp = err;
662 return x;
663}
664
22e70050 665static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 666 struct nlattr **attrs)
1da177e4 667{
fc34acd3 668 struct net *net = sock_net(skb->sk);
1da177e4 669 struct xfrm_state *x;
eb2971b6 670 int err = -ESRCH;
26b15dad 671 struct km_event c;
7b67c857 672 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4 673
fc34acd3 674 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 675 if (x == NULL)
eb2971b6 676 return err;
1da177e4 677
6f68dc37 678 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 679 goto out;
680
1da177e4 681 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 682 err = -EPERM;
683 goto out;
1da177e4
LT		 684 }
685
26b15dad 686 err = xfrm_state_delete(x);
161a09e7 687
c8c05a8e
CZ		 688 if (err < 0)
689 goto out;
26b15dad
JHS		 690
691 c.seq = nlh->nlmsg_seq;
15e47304 692 c.portid = nlh->nlmsg_pid;
f60f6b8f 693 c.event = nlh->nlmsg_type;
26b15dad 694 km_state_notify(x, &c);
1da177e4 695
c8c05a8e 696out:
2e71029e 697 xfrm_audit_state_delete(x, err ? 0 : 1, true);
c8c05a8e 698 xfrm_state_put(x);
26b15dad 699 return err;
1da177e4
LT		 700}
701
702static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
703{
f778a636 704 memset(p, 0, sizeof(*p));
1da177e4
LT		 705 memcpy(&p->id, &x->id, sizeof(p->id));
706 memcpy(&p->sel, &x->sel, sizeof(p->sel));
707 memcpy(&p->lft, &x->lft, sizeof(p->lft));
708 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
709 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 710 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 711 p->mode = x->props.mode;
712 p->replay_window = x->props.replay_window;
713 p->reqid = x->props.reqid;
714 p->family = x->props.family;
715 p->flags = x->props.flags;
716 p->seq = x->km.seq;
717}
718
719struct xfrm_dump_info {
720 struct sk_buff *in_skb;
721 struct sk_buff *out_skb;
722 u32 nlmsg_seq;
723 u16 nlmsg_flags;
1da177e4
LT		 724};
725
c0144bea
TG		 726static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
727{
c0144bea
TG		 728 struct xfrm_user_sec_ctx *uctx;
729 struct nlattr *attr;
68325d3b 730 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 731
732 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
733 if (attr == NULL)
734 return -EMSGSIZE;
735
736 uctx = nla_data(attr);
737 uctx->exttype = XFRMA_SEC_CTX;
738 uctx->len = ctx_size;
739 uctx->ctx_doi = s->ctx_doi;
740 uctx->ctx_alg = s->ctx_alg;
741 uctx->ctx_len = s->ctx_len;
742 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
743
744 return 0;
745}
746
4447bb33
MW		 747static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
748{
749 struct xfrm_algo *algo;
750 struct nlattr *nla;
751
752 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
753 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
754 if (!nla)
755 return -EMSGSIZE;
756
757 algo = nla_data(nla);
4c87308b 758 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 759 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
760 algo->alg_key_len = auth->alg_key_len;
761
762 return 0;
763}
764
68325d3b
HX		 765/* Don't change this without updating xfrm_sa_len! */
766static int copy_to_user_state_extra(struct xfrm_state *x,
767 struct xfrm_usersa_info *p,
768 struct sk_buff *skb)
1da177e4 769{
1d1e34dd 770 int ret = 0;
d0fde795 771
1d1e34dd 772 copy_to_user_state(x, p);
68325d3b 773
a947b0a9
ND		 774 if (x->props.extra_flags) {
775 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
776 x->props.extra_flags);
777 if (ret)
778 goto out;
779 }
780
1d1e34dd
DM		 781 if (x->coaddr) {
782 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
783 if (ret)
784 goto out;
785 }
786 if (x->lastused) {
787 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
788 if (ret)
789 goto out;
790 }
791 if (x->aead) {
792 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
793 if (ret)
794 goto out;
795 }
796 if (x->aalg) {
797 ret = copy_to_user_auth(x->aalg, skb);
798 if (!ret)
799 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
800 xfrm_alg_auth_len(x->aalg), x->aalg);
801 if (ret)
802 goto out;
803 }
804 if (x->ealg) {
805 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
806 if (ret)
807 goto out;
808 }
809 if (x->calg) {
810 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
811 if (ret)
812 goto out;
813 }
814 if (x->encap) {
815 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
816 if (ret)
817 goto out;
818 }
819 if (x->tfcpad) {
820 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
821 if (ret)
822 goto out;
823 }
824 ret = xfrm_mark_put(skb, &x->mark);
825 if (ret)
826 goto out;
f293a5e3 827 if (x->replay_esn)
1d1e34dd
DM		 828 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
829 xfrm_replay_state_esn_len(x->replay_esn),
830 x->replay_esn);
f293a5e3 831 else
832 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
833 &x->replay);
834 if (ret)
835 goto out;
1d1e34dd
DM		 836 if (x->security)
837 ret = copy_sec_ctx(x->security, skb);
838out:
839 return ret;
68325d3b
HX		 840}
841
842static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
843{
844 struct xfrm_dump_info *sp = ptr;
845 struct sk_buff *in_skb = sp->in_skb;
846 struct sk_buff *skb = sp->out_skb;
847 struct xfrm_usersa_info *p;
848 struct nlmsghdr *nlh;
849 int err;
850
15e47304 851 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
68325d3b
HX		 852 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
853 if (nlh == NULL)
854 return -EMSGSIZE;
855
856 p = nlmsg_data(nlh);
857
858 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 859 if (err) {
860 nlmsg_cancel(skb, nlh);
861 return err;
862 }
9825069d 863 nlmsg_end(skb, nlh);
1da177e4 864 return 0;
1da177e4
LT		 865}
866
4c563f76
TT		 867static int xfrm_dump_sa_done(struct netlink_callback *cb)
868{
869 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
283bc9f3
FD		 870 struct sock *sk = cb->skb->sk;
871 struct net *net = sock_net(sk);
872
873 xfrm_state_walk_done(walk, net);
4c563f76
TT		 874 return 0;
875}
876
d3623099 877static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1da177e4
LT		 878static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
879{
fc34acd3 880 struct net *net = sock_net(skb->sk);
4c563f76 881 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 882 struct xfrm_dump_info info;
883
4c563f76
TT		 884 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
885 sizeof(cb->args) - sizeof(cb->args[0]));
886
1da177e4
LT		 887 info.in_skb = cb->skb;
888 info.out_skb = skb;
889 info.nlmsg_seq = cb->nlh->nlmsg_seq;
890 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 891
892 if (!cb->args[0]) {
d3623099 893 struct nlattr *attrs[XFRMA_MAX+1];
870a2df4 894 struct xfrm_address_filter *filter = NULL;
d3623099
ND		 895 u8 proto = 0;
896 int err;
897
4c563f76 898 cb->args[0] = 1;
d3623099
ND		 899
900 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
901 xfrma_policy);
902 if (err < 0)
903 return err;
904
870a2df4 905 if (attrs[XFRMA_ADDRESS_FILTER]) {
d3623099
ND		 906 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
907 if (filter == NULL)
908 return -ENOMEM;
909
870a2df4 910 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
d3623099
ND		 911 sizeof(*filter));
912 }
913
914 if (attrs[XFRMA_PROTO])
915 proto = nla_get_u8(attrs[XFRMA_PROTO]);
916
917 xfrm_state_walk_init(walk, proto, filter);
4c563f76
TT		 918 }
919
fc34acd3 920 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 921
922 return skb->len;
923}
924
925static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
926 struct xfrm_state *x, u32 seq)
927{
928 struct xfrm_dump_info info;
929 struct sk_buff *skb;
864745d2 930 int err;
1da177e4 931
7deb2264 932 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 933 if (!skb)
934 return ERR_PTR(-ENOMEM);
935
1da177e4
LT		 936 info.in_skb = in_skb;
937 info.out_skb = skb;
938 info.nlmsg_seq = seq;
939 info.nlmsg_flags = 0;
1da177e4 940
864745d2
MK		 941 err = dump_one_state(x, 0, &info);
942 if (err) {
1da177e4 943 kfree_skb(skb);
864745d2 944 return ERR_PTR(err);
1da177e4
LT		 945 }
946
947 return skb;
948}
949
21ee543e
MK		 950/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
951 * Must be called with RCU read lock.
952 */
953static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
954 u32 pid, unsigned int group)
955{
956 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
957
958 if (nlsk)
959 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
960 else
961 return -1;
962}
963
7deb2264
TG		 964static inline size_t xfrm_spdinfo_msgsize(void)
965{
966 return NLMSG_ALIGN(4)
967 + nla_total_size(sizeof(struct xfrmu_spdinfo))
880a6fab
CG		 968 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
969 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
970 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
7deb2264
TG		 971}
972
e071041b 973static int build_spdinfo(struct sk_buff *skb, struct net *net,
15e47304 974 u32 portid, u32 seq, u32 flags)
ecfd6b18 975{
5a6d3416
JHS		 976 struct xfrmk_spdinfo si;
977 struct xfrmu_spdinfo spc;
978 struct xfrmu_spdhinfo sph;
880a6fab 979 struct xfrmu_spdhthresh spt4, spt6;
ecfd6b18 980 struct nlmsghdr *nlh;
1d1e34dd 981 int err;
ecfd6b18 982 u32 *f;
880a6fab 983 unsigned lseq;
ecfd6b18 984
15e47304 985 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 986 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 987 return -EMSGSIZE;
988
989 f = nlmsg_data(nlh);
990 *f = flags;
e071041b 991 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 992 spc.incnt = si.incnt;
993 spc.outcnt = si.outcnt;
994 spc.fwdcnt = si.fwdcnt;
995 spc.inscnt = si.inscnt;
996 spc.outscnt = si.outscnt;
997 spc.fwdscnt = si.fwdscnt;
998 sph.spdhcnt = si.spdhcnt;
999 sph.spdhmcnt = si.spdhmcnt;
1000
880a6fab
CG		 1001 do {
1002 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1003
1004 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1005 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1006 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1007 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1008 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1009
1d1e34dd
DM		 1010 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1011 if (!err)
1012 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
880a6fab
CG		 1013 if (!err)
1014 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1015 if (!err)
1016 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1d1e34dd
DM		 1017 if (err) {
1018 nlmsg_cancel(skb, nlh);
1019 return err;
1020 }
ecfd6b18 1021
053c095a
JB		 1022 nlmsg_end(skb, nlh);
1023 return 0;
ecfd6b18
JHS		 1024}
1025
880a6fab
CG		 1026static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1027 struct nlattr **attrs)
1028{
1029 struct net *net = sock_net(skb->sk);
1030 struct xfrmu_spdhthresh *thresh4 = NULL;
1031 struct xfrmu_spdhthresh *thresh6 = NULL;
1032
1033 /* selector prefixlen thresholds to hash policies */
1034 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1035 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1036
1037 if (nla_len(rta) < sizeof(*thresh4))
1038 return -EINVAL;
1039 thresh4 = nla_data(rta);
1040 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1041 return -EINVAL;
1042 }
1043 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1044 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1045
1046 if (nla_len(rta) < sizeof(*thresh6))
1047 return -EINVAL;
1048 thresh6 = nla_data(rta);
1049 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1050 return -EINVAL;
1051 }
1052
1053 if (thresh4 || thresh6) {
1054 write_seqlock(&net->xfrm.policy_hthresh.lock);
1055 if (thresh4) {
1056 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1057 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1058 }
1059 if (thresh6) {
1060 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1061 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1062 }
1063 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1064
1065 xfrm_policy_hash_rebuild(net);
1066 }
1067
1068 return 0;
1069}
1070
ecfd6b18 1071static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1072 struct nlattr **attrs)
ecfd6b18 1073{
a6483b79 1074 struct net *net = sock_net(skb->sk);
ecfd6b18 1075 struct sk_buff *r_skb;
7b67c857 1076 u32 *flags = nlmsg_data(nlh);
15e47304 1077 u32 sportid = NETLINK_CB(skb).portid;
ecfd6b18 1078 u32 seq = nlh->nlmsg_seq;
ecfd6b18 1079
7deb2264 1080 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 1081 if (r_skb == NULL)
1082 return -ENOMEM;
1083
15e47304 1084 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
ecfd6b18
JHS		 1085 BUG();
1086
15e47304 1087 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
ecfd6b18
JHS		 1088}
1089
7deb2264
TG		 1090static inline size_t xfrm_sadinfo_msgsize(void)
1091{
1092 return NLMSG_ALIGN(4)
1093 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1094 + nla_total_size(4); /* XFRMA_SAD_CNT */
1095}
1096
e071041b 1097static int build_sadinfo(struct sk_buff *skb, struct net *net,
15e47304 1098 u32 portid, u32 seq, u32 flags)
28d8909b 1099{
af11e316
JHS		 1100 struct xfrmk_sadinfo si;
1101 struct xfrmu_sadhinfo sh;
28d8909b 1102 struct nlmsghdr *nlh;
1d1e34dd 1103 int err;
28d8909b
JHS		 1104 u32 *f;
1105
15e47304 1106 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 1107 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 1108 return -EMSGSIZE;
1109
1110 f = nlmsg_data(nlh);
1111 *f = flags;
e071041b 1112 xfrm_sad_getinfo(net, &si);
28d8909b 1113
af11e316
JHS		 1114 sh.sadhmcnt = si.sadhmcnt;
1115 sh.sadhcnt = si.sadhcnt;
1116
1d1e34dd
DM		 1117 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1118 if (!err)
1119 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1120 if (err) {
1121 nlmsg_cancel(skb, nlh);
1122 return err;
1123 }
28d8909b 1124
053c095a
JB		 1125 nlmsg_end(skb, nlh);
1126 return 0;
28d8909b
JHS		 1127}
1128
1129static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1130 struct nlattr **attrs)
28d8909b 1131{
a6483b79 1132 struct net *net = sock_net(skb->sk);
28d8909b 1133 struct sk_buff *r_skb;
7b67c857 1134 u32 *flags = nlmsg_data(nlh);
15e47304 1135 u32 sportid = NETLINK_CB(skb).portid;
28d8909b 1136 u32 seq = nlh->nlmsg_seq;
28d8909b 1137
7deb2264 1138 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1139 if (r_skb == NULL)
1140 return -ENOMEM;
1141
15e47304 1142 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
28d8909b
JHS		 1143 BUG();
1144
15e47304 1145 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
28d8909b
JHS		 1146}
1147
22e70050 1148static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1149 struct nlattr **attrs)
1da177e4 1150{
fc34acd3 1151 struct net *net = sock_net(skb->sk);
7b67c857 1152 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1153 struct xfrm_state *x;
1154 struct sk_buff *resp_skb;
eb2971b6 1155 int err = -ESRCH;
1da177e4 1156
fc34acd3 1157 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1158 if (x == NULL)
1159 goto out_noput;
1160
1161 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1162 if (IS_ERR(resp_skb)) {
1163 err = PTR_ERR(resp_skb);
1164 } else {
15e47304 1165 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1166 }
1167 xfrm_state_put(x);
1168out_noput:
1169 return err;
1170}
1171
22e70050 1172static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1173 struct nlattr **attrs)
1da177e4 1174{
fc34acd3 1175 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1176 struct xfrm_state *x;
1177 struct xfrm_userspi_info *p;
1178 struct sk_buff *resp_skb;
1179 xfrm_address_t *daddr;
1180 int family;
1181 int err;
6f26b61e
JHS		 1182 u32 mark;
1183 struct xfrm_mark m;
1da177e4 1184
7b67c857 1185 p = nlmsg_data(nlh);
776e9dd9 1186 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1da177e4
LT		 1187 if (err)
1188 goto out_noput;
1189
1190 family = p->info.family;
1191 daddr = &p->info.id.daddr;
1192
1193 x = NULL;
6f26b61e
JHS		 1194
1195 mark = xfrm_mark_get(attrs, &m);
1da177e4 1196 if (p->info.seq) {
6f26b61e 1197 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
70e94e66 1198 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1da177e4
LT		 1199 xfrm_state_put(x);
1200 x = NULL;
1201 }
1202 }
1203
1204 if (!x)
6f26b61e 1205 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1206 p->info.id.proto, daddr,
1207 &p->info.saddr, 1,
1208 family);
1209 err = -ENOENT;
1210 if (x == NULL)
1211 goto out_noput;
1212
658b219e
HX		 1213 err = xfrm_alloc_spi(x, p->min, p->max);
1214 if (err)
1215 goto out;
1da177e4 1216
658b219e 1217 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1218 if (IS_ERR(resp_skb)) {
1219 err = PTR_ERR(resp_skb);
1220 goto out;
1221 }
1222
15e47304 1223 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1224
1225out:
1226 xfrm_state_put(x);
1227out_noput:
1228 return err;
1229}
1230
b798a9ed 1231static int verify_policy_dir(u8 dir)
1da177e4
LT		 1232{
1233 switch (dir) {
1234 case XFRM_POLICY_IN:
1235 case XFRM_POLICY_OUT:
1236 case XFRM_POLICY_FWD:
1237 break;
1238
1239 default:
1240 return -EINVAL;
3ff50b79 1241 }
1da177e4
LT		 1242
1243 return 0;
1244}
1245
b798a9ed 1246static int verify_policy_type(u8 type)
f7b6983f
MN		 1247{
1248 switch (type) {
1249 case XFRM_POLICY_TYPE_MAIN:
1250#ifdef CONFIG_XFRM_SUB_POLICY
1251 case XFRM_POLICY_TYPE_SUB:
1252#endif
1253 break;
1254
1255 default:
1256 return -EINVAL;
3ff50b79 1257 }
f7b6983f
MN		 1258
1259 return 0;
1260}
1261
1da177e4
LT		 1262static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1263{
e682adf0
FD		 1264 int ret;
1265
1da177e4
LT		 1266 switch (p->share) {
1267 case XFRM_SHARE_ANY:
1268 case XFRM_SHARE_SESSION:
1269 case XFRM_SHARE_USER:
1270 case XFRM_SHARE_UNIQUE:
1271 break;
1272
1273 default:
1274 return -EINVAL;
3ff50b79 1275 }
1da177e4
LT		 1276
1277 switch (p->action) {
1278 case XFRM_POLICY_ALLOW:
1279 case XFRM_POLICY_BLOCK:
1280 break;
1281
1282 default:
1283 return -EINVAL;
3ff50b79 1284 }
1da177e4
LT		 1285
1286 switch (p->sel.family) {
1287 case AF_INET:
1288 break;
1289
1290 case AF_INET6:
dfd56b8b 1291#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1292 break;
1293#else
1294 return -EAFNOSUPPORT;
1295#endif
1296
1297 default:
1298 return -EINVAL;
3ff50b79 1299 }
1da177e4 1300
e682adf0
FD		 1301 ret = verify_policy_dir(p->dir);
1302 if (ret)
1303 return ret;
1304 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1305 return -EINVAL;
1306
1307 return 0;
1da177e4
LT		 1308}
1309
5424f32e 1310static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1311{
5424f32e 1312 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1313 struct xfrm_user_sec_ctx *uctx;
1314
1315 if (!rt)
1316 return 0;
1317
5424f32e 1318 uctx = nla_data(rt);
52a4c640 1319 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
df71837d
TJ		 1320}
1321
1da177e4
LT		 1322static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1323 int nr)
1324{
1325 int i;
1326
1327 xp->xfrm_nr = nr;
1328 for (i = 0; i < nr; i++, ut++) {
1329 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1330
1331 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1332 memcpy(&t->saddr, &ut->saddr,
1333 sizeof(xfrm_address_t));
1334 t->reqid = ut->reqid;
1335 t->mode = ut->mode;
1336 t->share = ut->share;
1337 t->optional = ut->optional;
1338 t->aalgos = ut->aalgos;
1339 t->ealgos = ut->ealgos;
1340 t->calgos = ut->calgos;
c5d18e98
HX		 1341 /* If all masks are ~0, then we allow all algorithms. */
1342 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1343 t->encap_family = ut->family;
1da177e4
LT		 1344 }
1345}
1346
b4ad86bf
DM		 1347static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1348{
1349 int i;
1350
1351 if (nr > XFRM_MAX_DEPTH)
1352 return -EINVAL;
1353
1354 for (i = 0; i < nr; i++) {
1355 /* We never validated the ut->family value, so many
1356 * applications simply leave it at zero. The check was
1357 * never made and ut->family was ignored because all
1358 * templates could be assumed to have the same family as
1359 * the policy itself. Now that we will have ipv4-in-ipv6
1360 * and ipv6-in-ipv4 tunnels, this is no longer true.
1361 */
1362 if (!ut[i].family)
1363 ut[i].family = family;
1364
1365 switch (ut[i].family) {
1366 case AF_INET:
1367 break;
dfd56b8b 1368#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1369 case AF_INET6:
1370 break;
1371#endif
1372 default:
1373 return -EINVAL;
3ff50b79 1374 }
b4ad86bf
DM		 1375 }
1376
1377 return 0;
1378}
1379
5424f32e 1380static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1381{
5424f32e 1382 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1383
1384 if (!rt) {
1385 pol->xfrm_nr = 0;
1386 } else {
5424f32e
TG		 1387 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1388 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1389 int err;
1da177e4 1390
b4ad86bf
DM		 1391 err = validate_tmpl(nr, utmpl, pol->family);
1392 if (err)
1393 return err;
1da177e4 1394
5424f32e 1395 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1396 }
1397 return 0;
1398}
1399
5424f32e 1400static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1401{
5424f32e 1402 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1403 struct xfrm_userpolicy_type *upt;
b798a9ed 1404 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1405 int err;
1406
1407 if (rt) {
5424f32e 1408 upt = nla_data(rt);
f7b6983f
MN		 1409 type = upt->type;
1410 }
1411
1412 err = verify_policy_type(type);
1413 if (err)
1414 return err;
1415
1416 *tp = type;
1417 return 0;
1418}
1419
1da177e4
LT		 1420static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1421{
1422 xp->priority = p->priority;
1423 xp->index = p->index;
1424 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1425 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1426 xp->action = p->action;
1427 xp->flags = p->flags;
1428 xp->family = p->sel.family;
1429 /* XXX xp->share = p->share; */
1430}
1431
1432static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1433{
7b789836 1434 memset(p, 0, sizeof(*p));
1da177e4
LT		 1435 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1436 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1437 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1438 p->priority = xp->priority;
1439 p->index = xp->index;
1440 p->sel.family = xp->family;
1441 p->dir = dir;
1442 p->action = xp->action;
1443 p->flags = xp->flags;
1444 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1445}
1446
fc34acd3 1447static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1448{
fc34acd3 1449 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1450 int err;
1451
1452 if (!xp) {
1453 *errp = -ENOMEM;
1454 return NULL;
1455 }
1456
1457 copy_from_user_policy(xp, p);
df71837d 1458
35a7aa08 1459 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1460 if (err)
1461 goto error;
1462
35a7aa08
TG		 1463 if (!(err = copy_from_user_tmpl(xp, attrs)))
1464 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1465 if (err)
1466 goto error;
1da177e4 1467
295fae56
JHS		 1468 xfrm_mark_get(attrs, &xp->mark);
1469
1da177e4 1470 return xp;
f7b6983f
MN		 1471 error:
1472 *errp = err;
12a169e7 1473 xp->walk.dead = 1;
64c31b3f 1474 xfrm_policy_destroy(xp);
f7b6983f 1475 return NULL;
1da177e4
LT		 1476}
1477
22e70050 1478static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1479 struct nlattr **attrs)
1da177e4 1480{
fc34acd3 1481 struct net *net = sock_net(skb->sk);
7b67c857 1482 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1483 struct xfrm_policy *xp;
26b15dad 1484 struct km_event c;
1da177e4
LT		 1485 int err;
1486 int excl;
1487
1488 err = verify_newpolicy_info(p);
df71837d
TJ		 1489 if (err)
1490 return err;
35a7aa08 1491 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1492 if (err)
1493 return err;
1494
fc34acd3 1495 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1496 if (!xp)
1497 return err;
1498
25985edc 1499 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1500 * Aha! this is anti-netlink really i.e more pfkey derived
1501 * in netlink excl is a flag and you wouldnt need
1502 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1503 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1504 err = xfrm_policy_insert(p->dir, xp, excl);
2e71029e 1505 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
161a09e7 1506
1da177e4 1507 if (err) {
03e1ad7b 1508 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1509 kfree(xp);
1510 return err;
1511 }
1512
f60f6b8f 1513 c.event = nlh->nlmsg_type;
26b15dad 1514 c.seq = nlh->nlmsg_seq;
15e47304 1515 c.portid = nlh->nlmsg_pid;
26b15dad
JHS		 1516 km_policy_notify(xp, p->dir, &c);
1517
1da177e4
LT		 1518 xfrm_pol_put(xp);
1519
1520 return 0;
1521}
1522
1523static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1524{
1525 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1526 int i;
1527
1528 if (xp->xfrm_nr == 0)
1529 return 0;
1530
1531 for (i = 0; i < xp->xfrm_nr; i++) {
1532 struct xfrm_user_tmpl *up = &vec[i];
1533 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1534
1f86840f 1535 memset(up, 0, sizeof(*up));
1da177e4 1536 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1537 up->family = kp->encap_family;
1da177e4
LT		 1538 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1539 up->reqid = kp->reqid;
1540 up->mode = kp->mode;
1541 up->share = kp->share;
1542 up->optional = kp->optional;
1543 up->aalgos = kp->aalgos;
1544 up->ealgos = kp->ealgos;
1545 up->calgos = kp->calgos;
1546 }
df71837d 1547
c0144bea
TG		 1548 return nla_put(skb, XFRMA_TMPL,
1549 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1550}
1551
1552static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1553{
1554 if (x->security) {
1555 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1556 }
1557 return 0;
0d681623 1558}
df71837d 1559
0d681623
SH		 1560static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1561{
1d1e34dd 1562 if (xp->security)
0d681623 1563 return copy_sec_ctx(xp->security, skb);
0d681623 1564 return 0;
df71837d 1565}
cfbfd45a
TG		 1566static inline size_t userpolicy_type_attrsize(void)
1567{
1568#ifdef CONFIG_XFRM_SUB_POLICY
1569 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1570#else
1571 return 0;
1572#endif
1573}
df71837d 1574
f7b6983f 1575#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1576static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1577{
c0144bea
TG		 1578 struct xfrm_userpolicy_type upt = {
1579 .type = type,
1580 };
f7b6983f 1581
c0144bea 1582 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1583}
1584
1585#else
b798a9ed 1586static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1587{
1588 return 0;
1589}
1590#endif
1591
1da177e4
LT		 1592static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1593{
1594 struct xfrm_dump_info *sp = ptr;
1595 struct xfrm_userpolicy_info *p;
1596 struct sk_buff *in_skb = sp->in_skb;
1597 struct sk_buff *skb = sp->out_skb;
1598 struct nlmsghdr *nlh;
1d1e34dd 1599 int err;
1da177e4 1600
15e47304 1601 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
79b8b7f4
TG		 1602 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1603 if (nlh == NULL)
1604 return -EMSGSIZE;
1da177e4 1605
7b67c857 1606 p = nlmsg_data(nlh);
1da177e4 1607 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1608 err = copy_to_user_tmpl(xp, skb);
1609 if (!err)
1610 err = copy_to_user_sec_ctx(xp, skb);
1611 if (!err)
1612 err = copy_to_user_policy_type(xp->type, skb);
1613 if (!err)
1614 err = xfrm_mark_put(skb, &xp->mark);
1615 if (err) {
1616 nlmsg_cancel(skb, nlh);
1617 return err;
1618 }
9825069d 1619 nlmsg_end(skb, nlh);
1da177e4 1620 return 0;
1da177e4
LT		 1621}
1622
4c563f76
TT		 1623static int xfrm_dump_policy_done(struct netlink_callback *cb)
1624{
1625 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
283bc9f3 1626 struct net *net = sock_net(cb->skb->sk);
4c563f76 1627
283bc9f3 1628 xfrm_policy_walk_done(walk, net);
4c563f76
TT		 1629 return 0;
1630}
1631
1da177e4
LT		 1632static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1633{
fc34acd3 1634 struct net *net = sock_net(skb->sk);
4c563f76 1635 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1636 struct xfrm_dump_info info;
1637
4c563f76
TT		 1638 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1639 sizeof(cb->args) - sizeof(cb->args[0]));
1640
1da177e4
LT		 1641 info.in_skb = cb->skb;
1642 info.out_skb = skb;
1643 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1644 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1645
1646 if (!cb->args[0]) {
1647 cb->args[0] = 1;
1648 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1649 }
1650
fc34acd3 1651 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1652
1653 return skb->len;
1654}
1655
1656static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1657 struct xfrm_policy *xp,
1658 int dir, u32 seq)
1659{
1660 struct xfrm_dump_info info;
1661 struct sk_buff *skb;
c2546372 1662 int err;
1da177e4 1663
7deb2264 1664 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1665 if (!skb)
1666 return ERR_PTR(-ENOMEM);
1667
1da177e4
LT		 1668 info.in_skb = in_skb;
1669 info.out_skb = skb;
1670 info.nlmsg_seq = seq;
1671 info.nlmsg_flags = 0;
1da177e4 1672
c2546372
MK		 1673 err = dump_one_policy(xp, dir, 0, &info);
1674 if (err) {
1da177e4 1675 kfree_skb(skb);
c2546372 1676 return ERR_PTR(err);
1da177e4
LT		 1677 }
1678
1679 return skb;
1680}
1681
22e70050 1682static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1683 struct nlattr **attrs)
1da177e4 1684{
fc34acd3 1685 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1686 struct xfrm_policy *xp;
1687 struct xfrm_userpolicy_id *p;
b798a9ed 1688 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1689 int err;
26b15dad 1690 struct km_event c;
1da177e4 1691 int delete;
295fae56
JHS		 1692 struct xfrm_mark m;
1693 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1694
7b67c857 1695 p = nlmsg_data(nlh);
1da177e4
LT		 1696 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1697
35a7aa08 1698 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1699 if (err)
1700 return err;
1701
1da177e4
LT		 1702 err = verify_policy_dir(p->dir);
1703 if (err)
1704 return err;
1705
1706 if (p->index)
295fae56 1707 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1708 else {
5424f32e 1709 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1710 struct xfrm_sec_ctx *ctx;
df71837d 1711
35a7aa08 1712 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1713 if (err)
1714 return err;
1715
2c8dd116 1716 ctx = NULL;
df71837d 1717 if (rt) {
5424f32e 1718 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1719
52a4c640 1720 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 1721 if (err)
df71837d 1722 return err;
2c8dd116 1723 }
295fae56 1724 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1725 ctx, delete, &err);
03e1ad7b 1726 security_xfrm_policy_free(ctx);
df71837d 1727 }
1da177e4
LT		 1728 if (xp == NULL)
1729 return -ENOENT;
1730
1731 if (!delete) {
1732 struct sk_buff *resp_skb;
1733
1734 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1735 if (IS_ERR(resp_skb)) {
1736 err = PTR_ERR(resp_skb);
1737 } else {
a6483b79 1738 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
15e47304 1739 NETLINK_CB(skb).portid);
1da177e4 1740 }
26b15dad 1741 } else {
2e71029e 1742 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
13fcfbb0
DM		 1743
1744 if (err != 0)
c8c05a8e 1745 goto out;
13fcfbb0 1746
e7443892 1747 c.data.byid = p->index;
f60f6b8f 1748 c.event = nlh->nlmsg_type;
26b15dad 1749 c.seq = nlh->nlmsg_seq;
15e47304 1750 c.portid = nlh->nlmsg_pid;
26b15dad 1751 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1752 }
1753
c8c05a8e 1754out:
ef41aaa0 1755 xfrm_pol_put(xp);
e4c17216
PM		 1756 if (delete && err == 0)
1757 xfrm_garbage_collect(net);
1da177e4
LT		 1758 return err;
1759}
1760
22e70050 1761static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1762 struct nlattr **attrs)
1da177e4 1763{
fc34acd3 1764 struct net *net = sock_net(skb->sk);
26b15dad 1765 struct km_event c;
7b67c857 1766 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
4aa2e62c 1767 int err;
1da177e4 1768
2e71029e 1769 err = xfrm_state_flush(net, p->proto, true);
9e64cc95
JHS		 1770 if (err) {
1771 if (err == -ESRCH) /* empty table */
1772 return 0;
069c474e 1773 return err;
9e64cc95 1774 }
bf08867f 1775 c.data.proto = p->proto;
f60f6b8f 1776 c.event = nlh->nlmsg_type;
26b15dad 1777 c.seq = nlh->nlmsg_seq;
15e47304 1778 c.portid = nlh->nlmsg_pid;
7067802e 1779 c.net = net;
26b15dad
JHS		 1780 km_state_notify(NULL, &c);
1781
1da177e4
LT		 1782 return 0;
1783}
1784
d8647b79 1785static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1786{
d8647b79
SK		 1787 size_t replay_size = x->replay_esn ?
1788 xfrm_replay_state_esn_len(x->replay_esn) :
1789 sizeof(struct xfrm_replay_state);
1790
7deb2264 1791 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1792 + nla_total_size(replay_size)
7deb2264 1793 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1794 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1795 + nla_total_size(4) /* XFRM_AE_RTHR */
1796 + nla_total_size(4); /* XFRM_AE_ETHR */
1797}
d51d081d 1798
214e005b 1799static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1800{
1801 struct xfrm_aevent_id *id;
1802 struct nlmsghdr *nlh;
1d1e34dd 1803 int err;
d51d081d 1804
15e47304 1805 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
79b8b7f4
TG		 1806 if (nlh == NULL)
1807 return -EMSGSIZE;
d51d081d 1808
7b67c857 1809 id = nlmsg_data(nlh);
9b7a787d 1810 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
d51d081d
JHS		 1811 id->sa_id.spi = x->id.spi;
1812 id->sa_id.family = x->props.family;
1813 id->sa_id.proto = x->id.proto;
9b7a787d 1814 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2b5f6dcc 1815 id->reqid = x->props.reqid;
d51d081d
JHS		 1816 id->flags = c->data.aevent;
1817
d0fde795 1818 if (x->replay_esn) {
1d1e34dd
DM		 1819 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1820 xfrm_replay_state_esn_len(x->replay_esn),
1821 x->replay_esn);
d0fde795 1822 } else {
1d1e34dd
DM		 1823 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1824 &x->replay);
d0fde795 1825 }
1d1e34dd
DM		 1826 if (err)
1827 goto out_cancel;
1828 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1829 if (err)
1830 goto out_cancel;
d51d081d 1831
1d1e34dd
DM		 1832 if (id->flags & XFRM_AE_RTHR) {
1833 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1834 if (err)
1835 goto out_cancel;
1836 }
1837 if (id->flags & XFRM_AE_ETHR) {
1838 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1839 x->replay_maxage * 10 / HZ);
1840 if (err)
1841 goto out_cancel;
1842 }
1843 err = xfrm_mark_put(skb, &x->mark);
1844 if (err)
1845 goto out_cancel;
6f26b61e 1846
053c095a
JB		 1847 nlmsg_end(skb, nlh);
1848 return 0;
d51d081d 1849
1d1e34dd 1850out_cancel:
9825069d 1851 nlmsg_cancel(skb, nlh);
1d1e34dd 1852 return err;
d51d081d
JHS		 1853}
1854
22e70050 1855static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1856 struct nlattr **attrs)
d51d081d 1857{
fc34acd3 1858 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1859 struct xfrm_state *x;
1860 struct sk_buff *r_skb;
1861 int err;
1862 struct km_event c;
6f26b61e
JHS		 1863 u32 mark;
1864 struct xfrm_mark m;
7b67c857 1865 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1866 struct xfrm_usersa_id *id = &p->sa_id;
1867
6f26b61e
JHS		 1868 mark = xfrm_mark_get(attrs, &m);
1869
1870 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1871 if (x == NULL)
d51d081d 1872 return -ESRCH;
d8647b79
SK		 1873
1874 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1875 if (r_skb == NULL) {
1876 xfrm_state_put(x);
1877 return -ENOMEM;
d51d081d
JHS		 1878 }
1879
1880 /*
1881 * XXX: is this lock really needed - none of the other
1882 * gets lock (the concern is things getting updated
1883 * while we are still reading) - jhs
1884 */
1885 spin_lock_bh(&x->lock);
1886 c.data.aevent = p->flags;
1887 c.seq = nlh->nlmsg_seq;
15e47304 1888 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1889
1890 if (build_aevent(r_skb, x, &c) < 0)
1891 BUG();
15e47304 1892 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
d51d081d
JHS		 1893 spin_unlock_bh(&x->lock);
1894 xfrm_state_put(x);
1895 return err;
1896}
1897
22e70050 1898static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1899 struct nlattr **attrs)
d51d081d 1900{
fc34acd3 1901 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1902 struct xfrm_state *x;
1903 struct km_event c;
02d0892f 1904 int err = -EINVAL;
6f26b61e
JHS		 1905 u32 mark = 0;
1906 struct xfrm_mark m;
7b67c857 1907 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1908 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1909 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1910 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1911
d8647b79 1912 if (!lt && !rp && !re)
d51d081d
JHS		 1913 return err;
1914
1915 /* pedantic mode - thou shalt sayeth replaceth */
1916 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1917 return err;
1918
6f26b61e
JHS		 1919 mark = xfrm_mark_get(attrs, &m);
1920
1921 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1922 if (x == NULL)
1923 return -ESRCH;
1924
1925 if (x->km.state != XFRM_STATE_VALID)
1926 goto out;
1927
4479ff76 1928 err = xfrm_replay_verify_len(x->replay_esn, re);
e2b19125
SK		 1929 if (err)
1930 goto out;
1931
d51d081d 1932 spin_lock_bh(&x->lock);
e3ac104d 1933 xfrm_update_ae_params(x, attrs, 1);
d51d081d 1934 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1935
1936 c.event = nlh->nlmsg_type;
1937 c.seq = nlh->nlmsg_seq;
15e47304 1938 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1939 c.data.aevent = XFRM_AE_CU;
1940 km_state_notify(x, &c);
1941 err = 0;
1942out:
1943 xfrm_state_put(x);
1944 return err;
1945}
1946
22e70050 1947static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1948 struct nlattr **attrs)
1da177e4 1949{
fc34acd3 1950 struct net *net = sock_net(skb->sk);
f7b6983f 1951 struct km_event c;
b798a9ed 1952 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1953 int err;
1954
35a7aa08 1955 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1956 if (err)
1957 return err;
26b15dad 1958
2e71029e 1959 err = xfrm_policy_flush(net, type, true);
2f1eb65f
JHS		 1960 if (err) {
1961 if (err == -ESRCH) /* empty table */
1962 return 0;
069c474e 1963 return err;
2f1eb65f
JHS		 1964 }
1965
f7b6983f 1966 c.data.type = type;
f60f6b8f 1967 c.event = nlh->nlmsg_type;
26b15dad 1968 c.seq = nlh->nlmsg_seq;
15e47304 1969 c.portid = nlh->nlmsg_pid;
7067802e 1970 c.net = net;
26b15dad 1971 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1972 return 0;
1973}
1974
22e70050 1975static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1976 struct nlattr **attrs)
6c5c8ca7 1977{
fc34acd3 1978 struct net *net = sock_net(skb->sk);
6c5c8ca7 1979 struct xfrm_policy *xp;
7b67c857 1980 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1981 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1982 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1983 int err = -ENOENT;
295fae56
JHS		 1984 struct xfrm_mark m;
1985 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1986
35a7aa08 1987 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1988 if (err)
1989 return err;
1990
c8bf4d04
TT		 1991 err = verify_policy_dir(p->dir);
1992 if (err)
1993 return err;
1994
6c5c8ca7 1995 if (p->index)
295fae56 1996 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1997 else {
5424f32e 1998 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1999 struct xfrm_sec_ctx *ctx;
6c5c8ca7 2000
35a7aa08 2001 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 2002 if (err)
2003 return err;
2004
2c8dd116 2005 ctx = NULL;
6c5c8ca7 2006 if (rt) {
5424f32e 2007 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 2008
52a4c640 2009 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 2010 if (err)
6c5c8ca7 2011 return err;
2c8dd116 2012 }
295fae56 2013 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 2014 &p->sel, ctx, 0, &err);
03e1ad7b 2015 security_xfrm_policy_free(ctx);
6c5c8ca7 2016 }
6c5c8ca7 2017 if (xp == NULL)
ef41aaa0 2018 return -ENOENT;
03e1ad7b 2019
ea2dea9d 2020 if (unlikely(xp->walk.dead))
6c5c8ca7 2021 goto out;
6c5c8ca7 2022
6c5c8ca7
JHS		 2023 err = 0;
2024 if (up->hard) {
2025 xfrm_policy_delete(xp, p->dir);
2e71029e 2026 xfrm_audit_policy_delete(xp, 1, true);
6c5c8ca7
JHS		 2027 } else {
2028 // reset the timers here?
62db5cfd 2029 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7 2030 }
c6bb8136 2031 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
6c5c8ca7
JHS		 2032
2033out:
2034 xfrm_pol_put(xp);
2035 return err;
2036}
2037
22e70050 2038static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2039 struct nlattr **attrs)
53bc6b4d 2040{
fc34acd3 2041 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 2042 struct xfrm_state *x;
2043 int err;
7b67c857 2044 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 2045 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 2046 struct xfrm_mark m;
928497f0 2047 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 2048
6f26b61e 2049 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 2050
3a765aa5 2051 err = -ENOENT;
53bc6b4d
JHS		 2052 if (x == NULL)
2053 return err;
2054
53bc6b4d 2055 spin_lock_bh(&x->lock);
3a765aa5 2056 err = -EINVAL;
53bc6b4d
JHS		 2057 if (x->km.state != XFRM_STATE_VALID)
2058 goto out;
c6bb8136 2059 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
53bc6b4d 2060
161a09e7 2061 if (ue->hard) {
53bc6b4d 2062 __xfrm_state_delete(x);
2e71029e 2063 xfrm_audit_state_delete(x, 1, true);
161a09e7 2064 }
3a765aa5 2065 err = 0;
53bc6b4d
JHS		 2066out:
2067 spin_unlock_bh(&x->lock);
2068 xfrm_state_put(x);
2069 return err;
2070}
2071
22e70050 2072static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2073 struct nlattr **attrs)
980ebd25 2074{
fc34acd3 2075 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 2076 struct xfrm_policy *xp;
2077 struct xfrm_user_tmpl *ut;
2078 int i;
5424f32e 2079 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 2080 struct xfrm_mark mark;
980ebd25 2081
7b67c857 2082 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 2083 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 2084 int err = -ENOMEM;
2085
2086 if (!x)
d8eb9307 2087 goto nomem;
980ebd25 2088
6f26b61e
JHS		 2089 xfrm_mark_get(attrs, &mark);
2090
980ebd25 2091 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 2092 if (err)
2093 goto bad_policy;
980ebd25
JHS		 2094
2095 /* build an XP */
fc34acd3 2096 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2097 if (!xp)
2098 goto free_state;
980ebd25
JHS		 2099
2100 memcpy(&x->id, &ua->id, sizeof(ua->id));
2101 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2102 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2103 xp->mark.m = x->mark.m = mark.m;
2104 xp->mark.v = x->mark.v = mark.v;
5424f32e 2105 ut = nla_data(rt);
980ebd25
JHS		 2106 /* extract the templates and for each call km_key */
2107 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2108 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2109 memcpy(&x->id, &t->id, sizeof(x->id));
2110 x->props.mode = t->mode;
2111 x->props.reqid = t->reqid;
2112 x->props.family = ut->family;
2113 t->aalgos = ua->aalgos;
2114 t->ealgos = ua->ealgos;
2115 t->calgos = ua->calgos;
2116 err = km_query(x, t, xp);
2117
2118 }
2119
2120 kfree(x);
2121 kfree(xp);
2122
2123 return 0;
d8eb9307
IJ		 2124
2125bad_policy:
62db5cfd 2126 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2127free_state:
2128 kfree(x);
2129nomem:
2130 return err;
980ebd25
JHS		 2131}
2132
5c79de6e 2133#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2134static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2135 struct xfrm_kmaddress *k,
5424f32e 2136 struct nlattr **attrs, int *num)
5c79de6e 2137{
5424f32e 2138 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2139 struct xfrm_user_migrate *um;
2140 int i, num_migrate;
2141
13c1d189
AE		 2142 if (k != NULL) {
2143 struct xfrm_user_kmaddress *uk;
2144
2145 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2146 memcpy(&k->local, &uk->local, sizeof(k->local));
2147 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2148 k->family = uk->family;
2149 k->reserved = uk->reserved;
2150 }
2151
5424f32e
TG		 2152 um = nla_data(rt);
2153 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2154
2155 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2156 return -EINVAL;
2157
2158 for (i = 0; i < num_migrate; i++, um++, ma++) {
2159 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2160 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2161 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2162 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2163
2164 ma->proto = um->proto;
2165 ma->mode = um->mode;
2166 ma->reqid = um->reqid;
2167
2168 ma->old_family = um->old_family;
2169 ma->new_family = um->new_family;
2170 }
2171
2172 *num = i;
2173 return 0;
2174}
2175
2176static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2177 struct nlattr **attrs)
5c79de6e 2178{
7b67c857 2179 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2180 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2181 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2182 u8 type;
2183 int err;
2184 int n = 0;
8d549c4f 2185 struct net *net = sock_net(skb->sk);
5c79de6e 2186
35a7aa08 2187 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2188 return -EINVAL;
5c79de6e 2189
13c1d189
AE		 2190 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2191
5424f32e 2192 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2193 if (err)
2194 return err;
2195
13c1d189 2196 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2197 if (err)
2198 return err;
2199
2200 if (!n)
2201 return 0;
2202
8d549c4f 2203 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
5c79de6e
SS		 2204
2205 return 0;
2206}
2207#else
2208static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2209 struct nlattr **attrs)
5c79de6e
SS		 2210{
2211 return -ENOPROTOOPT;
2212}
2213#endif
2214
2215#ifdef CONFIG_XFRM_MIGRATE
183cad12 2216static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2217{
2218 struct xfrm_user_migrate um;
2219
2220 memset(&um, 0, sizeof(um));
2221 um.proto = m->proto;
2222 um.mode = m->mode;
2223 um.reqid = m->reqid;
2224 um.old_family = m->old_family;
2225 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2226 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2227 um.new_family = m->new_family;
2228 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2229 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2230
c0144bea 2231 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2232}
2233
183cad12 2234static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2235{
2236 struct xfrm_user_kmaddress uk;
2237
2238 memset(&uk, 0, sizeof(uk));
2239 uk.family = k->family;
2240 uk.reserved = k->reserved;
2241 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2242 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2243
2244 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2245}
2246
2247static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2248{
2249 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2250 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2251 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2252 + userpolicy_type_attrsize();
7deb2264
TG		 2253}
2254
183cad12
DM		 2255static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2256 int num_migrate, const struct xfrm_kmaddress *k,
2257 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2258{
183cad12 2259 const struct xfrm_migrate *mp;
5c79de6e
SS		 2260 struct xfrm_userpolicy_id *pol_id;
2261 struct nlmsghdr *nlh;
1d1e34dd 2262 int i, err;
5c79de6e 2263
79b8b7f4
TG		 2264 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2265 if (nlh == NULL)
2266 return -EMSGSIZE;
5c79de6e 2267
7b67c857 2268 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2269 /* copy data from selector, dir, and type to the pol_id */
2270 memset(pol_id, 0, sizeof(*pol_id));
2271 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2272 pol_id->dir = dir;
2273
1d1e34dd
DM		 2274 if (k != NULL) {
2275 err = copy_to_user_kmaddress(k, skb);
2276 if (err)
2277 goto out_cancel;
2278 }
2279 err = copy_to_user_policy_type(type, skb);
2280 if (err)
2281 goto out_cancel;
5c79de6e 2282 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2283 err = copy_to_user_migrate(mp, skb);
2284 if (err)
2285 goto out_cancel;
5c79de6e
SS		 2286 }
2287
053c095a
JB		 2288 nlmsg_end(skb, nlh);
2289 return 0;
1d1e34dd
DM		 2290
2291out_cancel:
9825069d 2292 nlmsg_cancel(skb, nlh);
1d1e34dd 2293 return err;
5c79de6e
SS		 2294}
2295
183cad12
DM		 2296static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2297 const struct xfrm_migrate *m, int num_migrate,
2298 const struct xfrm_kmaddress *k)
5c79de6e 2299{
a6483b79 2300 struct net *net = &init_net;
5c79de6e 2301 struct sk_buff *skb;
5c79de6e 2302
13c1d189 2303 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2304 if (skb == NULL)
2305 return -ENOMEM;
2306
2307 /* build migrate */
13c1d189 2308 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2309 BUG();
2310
21ee543e 2311 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
5c79de6e
SS		 2312}
2313#else
183cad12
DM		 2314static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2315 const struct xfrm_migrate *m, int num_migrate,
2316 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2317{
2318 return -ENOPROTOOPT;
2319}
2320#endif
d51d081d 2321
a7bd9a45 2322#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2323
2324static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2325 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2326 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2327 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2328 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2329 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2330 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2331 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2332 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2333 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2334 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2335 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2336 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2337 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2338 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2339 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2340 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2341 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2342 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45 2343 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
880a6fab 2344 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
a7bd9a45 2345 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2346};
2347
492b558b
TG		 2348#undef XMSGSIZE
2349
cf5cb79f 2350static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2351 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2352 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2353 [XFRMA_LASTUSED] = { .type = NLA_U64},
2354 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2355 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2356 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2357 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2358 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2359 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2360 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2361 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2362 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2363 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2364 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2365 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2366 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2367 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2368 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2369 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2370 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2371 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2372 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2373 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
a947b0a9 2374 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
d3623099 2375 [XFRMA_PROTO] = { .type = NLA_U8 },
870a2df4 2376 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
cf5cb79f
TG		 2377};
2378
880a6fab
CG		 2379static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2380 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2381 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2382};
2383
05600a79 2384static const struct xfrm_link {
5424f32e 2385 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2386 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2387 int (*done)(struct netlink_callback *);
880a6fab
CG		 2388 const struct nla_policy *nla_pol;
2389 int nla_max;
492b558b
TG		 2390} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2391 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2392 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2393 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2394 .dump = xfrm_dump_sa,
2395 .done = xfrm_dump_sa_done },
492b558b
TG		 2396 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2397 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2398 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2399 .dump = xfrm_dump_policy,
2400 .done = xfrm_dump_policy_done },
492b558b 2401 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2402 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2403 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2404 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2405 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2406 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2407 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2408 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2409 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2410 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2411 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2412 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
880a6fab
CG		 2413 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2414 .nla_pol = xfrma_spd_policy,
2415 .nla_max = XFRMA_SPD_MAX },
ecfd6b18 2416 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2417};
2418
1d00a4eb 2419static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2420{
a6483b79 2421 struct net *net = sock_net(skb->sk);
35a7aa08 2422 struct nlattr *attrs[XFRMA_MAX+1];
05600a79 2423 const struct xfrm_link *link;
a7bd9a45 2424 int type, err;
1da177e4 2425
1da177e4 2426 type = nlh->nlmsg_type;
1da177e4 2427 if (type > XFRM_MSG_MAX)
1d00a4eb 2428 return -EINVAL;
1da177e4
LT		 2429
2430 type -= XFRM_MSG_BASE;
2431 link = &xfrm_dispatch[type];
2432
2433 /* All operations require privileges, even GET */
90f62cf3 2434 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
1d00a4eb 2435 return -EPERM;
1da177e4 2436
492b558b
TG		 2437 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2438 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2439 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2440 if (link->dump == NULL)
1d00a4eb 2441 return -EINVAL;
88fc2c84 2442
80d326fa
PNA		 2443 {
2444 struct netlink_dump_control c = {
2445 .dump = link->dump,
2446 .done = link->done,
2447 };
2448 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2449 }
1da177e4
LT		 2450 }
2451
880a6fab
CG		 2452 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2453 link->nla_max ? : XFRMA_MAX,
2454 link->nla_pol ? : xfrma_policy);
a7bd9a45
TG		 2455 if (err < 0)
2456 return err;
1da177e4
LT		 2457
2458 if (link->doit == NULL)
1d00a4eb 2459 return -EINVAL;
1da177e4 2460
5424f32e 2461 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2462}
2463
cd40b7d3 2464static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2465{
283bc9f3
FD		 2466 struct net *net = sock_net(skb->sk);
2467
2468 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
cd40b7d3 2469 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
283bc9f3 2470 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
1da177e4
LT		 2471}
2472
7deb2264
TG		 2473static inline size_t xfrm_expire_msgsize(void)
2474{
6f26b61e
JHS		 2475 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2476 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2477}
2478
214e005b 2479static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2480{
2481 struct xfrm_user_expire *ue;
2482 struct nlmsghdr *nlh;
1d1e34dd 2483 int err;
1da177e4 2484
15e47304 2485 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
79b8b7f4
TG		 2486 if (nlh == NULL)
2487 return -EMSGSIZE;
1da177e4 2488
7b67c857 2489 ue = nlmsg_data(nlh);
1da177e4 2490 copy_to_user_state(x, &ue->state);
d51d081d 2491 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2492
1d1e34dd
DM		 2493 err = xfrm_mark_put(skb, &x->mark);
2494 if (err)
2495 return err;
6f26b61e 2496
053c095a
JB		 2497 nlmsg_end(skb, nlh);
2498 return 0;
1da177e4
LT		 2499}
2500
214e005b 2501static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2502{
fc34acd3 2503 struct net *net = xs_net(x);
1da177e4
LT		 2504 struct sk_buff *skb;
2505
7deb2264 2506 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2507 if (skb == NULL)
2508 return -ENOMEM;
2509
6f26b61e
JHS		 2510 if (build_expire(skb, x, c) < 0) {
2511 kfree_skb(skb);
2512 return -EMSGSIZE;
2513 }
1da177e4 2514
21ee543e 2515 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
1da177e4
LT		 2516}
2517
214e005b 2518static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2519{
fc34acd3 2520 struct net *net = xs_net(x);
d51d081d 2521 struct sk_buff *skb;
d51d081d 2522
d8647b79 2523 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2524 if (skb == NULL)
2525 return -ENOMEM;
2526
2527 if (build_aevent(skb, x, c) < 0)
2528 BUG();
2529
21ee543e 2530 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
d51d081d
JHS		 2531}
2532
214e005b 2533static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2534{
7067802e 2535 struct net *net = c->net;
26b15dad
JHS		 2536 struct xfrm_usersa_flush *p;
2537 struct nlmsghdr *nlh;
2538 struct sk_buff *skb;
7deb2264 2539 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2540
7deb2264 2541 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2542 if (skb == NULL)
2543 return -ENOMEM;
26b15dad 2544
15e47304 2545 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
79b8b7f4
TG		 2546 if (nlh == NULL) {
2547 kfree_skb(skb);
2548 return -EMSGSIZE;
2549 }
26b15dad 2550
7b67c857 2551 p = nlmsg_data(nlh);
bf08867f 2552 p->proto = c->data.proto;
26b15dad 2553
9825069d 2554 nlmsg_end(skb, nlh);
26b15dad 2555
21ee543e 2556 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
26b15dad
JHS		 2557}
2558
7deb2264 2559static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2560{
7deb2264 2561 size_t l = 0;
1a6509d9
HX		 2562 if (x->aead)
2563 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2564 if (x->aalg) {
2565 l += nla_total_size(sizeof(struct xfrm_algo) +
2566 (x->aalg->alg_key_len + 7) / 8);
2567 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2568 }
26b15dad 2569 if (x->ealg)
0f99be0d 2570 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2571 if (x->calg)
7deb2264 2572 l += nla_total_size(sizeof(*x->calg));
26b15dad 2573 if (x->encap)
7deb2264 2574 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2575 if (x->tfcpad)
2576 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2577 if (x->replay_esn)
2578 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
f293a5e3 2579 else
2580 l += nla_total_size(sizeof(struct xfrm_replay_state));
68325d3b
HX		 2581 if (x->security)
2582 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2583 x->security->ctx_len);
2584 if (x->coaddr)
2585 l += nla_total_size(sizeof(*x->coaddr));
a947b0a9
ND		 2586 if (x->props.extra_flags)
2587 l += nla_total_size(sizeof(x->props.extra_flags));
68325d3b 2588
d26f3984
HX		 2589 /* Must count x->lastused as it may become non-zero behind our back. */
2590 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2591
2592 return l;
2593}
2594
214e005b 2595static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2596{
fc34acd3 2597 struct net *net = xs_net(x);
26b15dad 2598 struct xfrm_usersa_info *p;
0603eac0 2599 struct xfrm_usersa_id *id;
26b15dad
JHS		 2600 struct nlmsghdr *nlh;
2601 struct sk_buff *skb;
26b15dad 2602 int len = xfrm_sa_len(x);
1d1e34dd 2603 int headlen, err;
0603eac0
HX		 2604
2605 headlen = sizeof(*p);
2606 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2607 len += nla_total_size(headlen);
0603eac0 2608 headlen = sizeof(*id);
6f26b61e 2609 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2610 }
7deb2264 2611 len += NLMSG_ALIGN(headlen);
26b15dad 2612
7deb2264 2613 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2614 if (skb == NULL)
2615 return -ENOMEM;
26b15dad 2616
15e47304 2617 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2618 err = -EMSGSIZE;
79b8b7f4 2619 if (nlh == NULL)
1d1e34dd 2620 goto out_free_skb;
26b15dad 2621
7b67c857 2622 p = nlmsg_data(nlh);
0603eac0 2623 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2624 struct nlattr *attr;
2625
7b67c857 2626 id = nlmsg_data(nlh);
0603eac0
HX		 2627 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2628 id->spi = x->id.spi;
2629 id->family = x->props.family;
2630 id->proto = x->id.proto;
2631
c0144bea 2632 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2633 err = -EMSGSIZE;
c0144bea 2634 if (attr == NULL)
1d1e34dd 2635 goto out_free_skb;
c0144bea
TG		 2636
2637 p = nla_data(attr);
0603eac0 2638 }
1d1e34dd
DM		 2639 err = copy_to_user_state_extra(x, p, skb);
2640 if (err)
2641 goto out_free_skb;
26b15dad 2642
9825069d 2643 nlmsg_end(skb, nlh);
26b15dad 2644
21ee543e 2645 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
26b15dad 2646
1d1e34dd 2647out_free_skb:
26b15dad 2648 kfree_skb(skb);
1d1e34dd 2649 return err;
26b15dad
JHS		 2650}
2651
214e005b 2652static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2653{
2654
2655 switch (c->event) {
f60f6b8f 2656 case XFRM_MSG_EXPIRE:
26b15dad 2657 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2658 case XFRM_MSG_NEWAE:
2659 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2660 case XFRM_MSG_DELSA:
2661 case XFRM_MSG_UPDSA:
2662 case XFRM_MSG_NEWSA:
26b15dad 2663 return xfrm_notify_sa(x, c);
f60f6b8f 2664 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2665 return xfrm_notify_sa_flush(c);
2666 default:
62db5cfd 2667 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2668 c->event);
2669 break;
26b15dad
JHS		 2670 }
2671
2672 return 0;
2673
2674}
2675
7deb2264
TG		 2676static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2677 struct xfrm_policy *xp)
2678{
2679 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2680 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2681 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2682 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2683 + userpolicy_type_attrsize();
2684}
2685
1da177e4 2686static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
65e0736b 2687 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
1da177e4 2688{
1d1e34dd 2689 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2690 struct xfrm_user_acquire *ua;
2691 struct nlmsghdr *nlh;
1d1e34dd 2692 int err;
1da177e4 2693
79b8b7f4
TG		 2694 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2695 if (nlh == NULL)
2696 return -EMSGSIZE;
1da177e4 2697
7b67c857 2698 ua = nlmsg_data(nlh);
1da177e4
LT		 2699 memcpy(&ua->id, &x->id, sizeof(ua->id));
2700 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2701 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
65e0736b 2702 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
1da177e4
LT		 2703 ua->aalgos = xt->aalgos;
2704 ua->ealgos = xt->ealgos;
2705 ua->calgos = xt->calgos;
2706 ua->seq = x->km.seq = seq;
2707
1d1e34dd
DM		 2708 err = copy_to_user_tmpl(xp, skb);
2709 if (!err)
2710 err = copy_to_user_state_sec_ctx(x, skb);
2711 if (!err)
2712 err = copy_to_user_policy_type(xp->type, skb);
2713 if (!err)
2714 err = xfrm_mark_put(skb, &xp->mark);
2715 if (err) {
2716 nlmsg_cancel(skb, nlh);
2717 return err;
2718 }
1da177e4 2719
053c095a
JB		 2720 nlmsg_end(skb, nlh);
2721 return 0;
1da177e4
LT		 2722}
2723
2724static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
65e0736b 2725 struct xfrm_policy *xp)
1da177e4 2726{
a6483b79 2727 struct net *net = xs_net(x);
1da177e4 2728 struct sk_buff *skb;
1da177e4 2729
7deb2264 2730 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2731 if (skb == NULL)
2732 return -ENOMEM;
2733
65e0736b 2734 if (build_acquire(skb, x, xt, xp) < 0)
1da177e4
LT		 2735 BUG();
2736
21ee543e 2737 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
1da177e4
LT		 2738}
2739
2740/* User gives us xfrm_user_policy_info followed by an array of 0
2741 * or more templates.
2742 */
cb969f07 2743static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2744 u8 *data, int len, int *dir)
2745{
fc34acd3 2746 struct net *net = sock_net(sk);
1da177e4
LT		 2747 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2748 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2749 struct xfrm_policy *xp;
2750 int nr;
2751
cb969f07 2752 switch (sk->sk_family) {
1da177e4
LT		 2753 case AF_INET:
2754 if (opt != IP_XFRM_POLICY) {
2755 *dir = -EOPNOTSUPP;
2756 return NULL;
2757 }
2758 break;
dfd56b8b 2759#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2760 case AF_INET6:
2761 if (opt != IPV6_XFRM_POLICY) {
2762 *dir = -EOPNOTSUPP;
2763 return NULL;
2764 }
2765 break;
2766#endif
2767 default:
2768 *dir = -EINVAL;
2769 return NULL;
2770 }
2771
2772 *dir = -EINVAL;
2773
2774 if (len < sizeof(*p) ||
2775 verify_newpolicy_info(p))
2776 return NULL;
2777
2778 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2779 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2780 return NULL;
2781
a4f1bac6
HX		 2782 if (p->dir > XFRM_POLICY_OUT)
2783 return NULL;
2784
2f09a4d5 2785 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2786 if (xp == NULL) {
2787 *dir = -ENOBUFS;
2788 return NULL;
2789 }
2790
2791 copy_from_user_policy(xp, p);
f7b6983f 2792 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2793 copy_templates(xp, ut, nr);
2794
2795 *dir = p->dir;
2796
2797 return xp;
2798}
2799
7deb2264
TG		 2800static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2801{
2802 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2803 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2804 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2805 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2806 + userpolicy_type_attrsize();
2807}
2808
1da177e4 2809static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2810 int dir, const struct km_event *c)
1da177e4
LT		 2811{
2812 struct xfrm_user_polexpire *upe;
d51d081d 2813 int hard = c->data.hard;
1d1e34dd
DM		 2814 struct nlmsghdr *nlh;
2815 int err;
1da177e4 2816
15e47304 2817 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
79b8b7f4
TG		 2818 if (nlh == NULL)
2819 return -EMSGSIZE;
1da177e4 2820
7b67c857 2821 upe = nlmsg_data(nlh);
1da177e4 2822 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2823 err = copy_to_user_tmpl(xp, skb);
2824 if (!err)
2825 err = copy_to_user_sec_ctx(xp, skb);
2826 if (!err)
2827 err = copy_to_user_policy_type(xp->type, skb);
2828 if (!err)
2829 err = xfrm_mark_put(skb, &xp->mark);
2830 if (err) {
2831 nlmsg_cancel(skb, nlh);
2832 return err;
2833 }
1da177e4
LT		 2834 upe->hard = !!hard;
2835
053c095a
JB		 2836 nlmsg_end(skb, nlh);
2837 return 0;
1da177e4
LT		 2838}
2839
214e005b 2840static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2841{
fc34acd3 2842 struct net *net = xp_net(xp);
1da177e4 2843 struct sk_buff *skb;
1da177e4 2844
7deb2264 2845 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2846 if (skb == NULL)
2847 return -ENOMEM;
2848
d51d081d 2849 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2850 BUG();
2851
21ee543e 2852 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
1da177e4
LT		 2853}
2854
214e005b 2855static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2856{
1d1e34dd 2857 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2858 struct net *net = xp_net(xp);
26b15dad 2859 struct xfrm_userpolicy_info *p;
0603eac0 2860 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2861 struct nlmsghdr *nlh;
2862 struct sk_buff *skb;
1d1e34dd 2863 int headlen, err;
0603eac0
HX		 2864
2865 headlen = sizeof(*p);
2866 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2867 len += nla_total_size(headlen);
0603eac0
HX		 2868 headlen = sizeof(*id);
2869 }
cfbfd45a 2870 len += userpolicy_type_attrsize();
295fae56 2871 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2872 len += NLMSG_ALIGN(headlen);
26b15dad 2873
7deb2264 2874 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2875 if (skb == NULL)
2876 return -ENOMEM;
26b15dad 2877
15e47304 2878 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2879 err = -EMSGSIZE;
79b8b7f4 2880 if (nlh == NULL)
1d1e34dd 2881 goto out_free_skb;
26b15dad 2882
7b67c857 2883 p = nlmsg_data(nlh);
0603eac0 2884 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2885 struct nlattr *attr;
2886
7b67c857 2887 id = nlmsg_data(nlh);
0603eac0
HX		 2888 memset(id, 0, sizeof(*id));
2889 id->dir = dir;
2890 if (c->data.byid)
2891 id->index = xp->index;
2892 else
2893 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2894
c0144bea 2895 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2896 err = -EMSGSIZE;
c0144bea 2897 if (attr == NULL)
1d1e34dd 2898 goto out_free_skb;
c0144bea
TG		 2899
2900 p = nla_data(attr);
0603eac0 2901 }
26b15dad 2902
26b15dad 2903 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2904 err = copy_to_user_tmpl(xp, skb);
2905 if (!err)
2906 err = copy_to_user_policy_type(xp->type, skb);
2907 if (!err)
2908 err = xfrm_mark_put(skb, &xp->mark);
2909 if (err)
2910 goto out_free_skb;
295fae56 2911
9825069d 2912 nlmsg_end(skb, nlh);
26b15dad 2913
21ee543e 2914 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
26b15dad 2915
1d1e34dd 2916out_free_skb:
26b15dad 2917 kfree_skb(skb);
1d1e34dd 2918 return err;
26b15dad
JHS		 2919}
2920
214e005b 2921static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2922{
7067802e 2923 struct net *net = c->net;
26b15dad
JHS		 2924 struct nlmsghdr *nlh;
2925 struct sk_buff *skb;
1d1e34dd 2926 int err;
26b15dad 2927
7deb2264 2928 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2929 if (skb == NULL)
2930 return -ENOMEM;
26b15dad 2931
15e47304 2932 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2933 err = -EMSGSIZE;
79b8b7f4 2934 if (nlh == NULL)
1d1e34dd
DM		 2935 goto out_free_skb;
2936 err = copy_to_user_policy_type(c->data.type, skb);
2937 if (err)
2938 goto out_free_skb;
26b15dad 2939
9825069d 2940 nlmsg_end(skb, nlh);
26b15dad 2941
21ee543e 2942 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
26b15dad 2943
1d1e34dd 2944out_free_skb:
26b15dad 2945 kfree_skb(skb);
1d1e34dd 2946 return err;
26b15dad
JHS		 2947}
2948
214e005b 2949static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2950{
2951
2952 switch (c->event) {
f60f6b8f
HX		 2953 case XFRM_MSG_NEWPOLICY:
2954 case XFRM_MSG_UPDPOLICY:
2955 case XFRM_MSG_DELPOLICY:
26b15dad 2956 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2957 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2958 return xfrm_notify_policy_flush(c);
f60f6b8f 2959 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2960 return xfrm_exp_policy_notify(xp, dir, c);
2961 default:
62db5cfd 2962 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2963 c->event);
26b15dad
JHS		 2964 }
2965
2966 return 0;
2967
2968}
2969
7deb2264
TG		 2970static inline size_t xfrm_report_msgsize(void)
2971{
2972 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2973}
2974
97a64b45
MN		 2975static int build_report(struct sk_buff *skb, u8 proto,
2976 struct xfrm_selector *sel, xfrm_address_t *addr)
2977{
2978 struct xfrm_user_report *ur;
2979 struct nlmsghdr *nlh;
97a64b45 2980
79b8b7f4
TG		 2981 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2982 if (nlh == NULL)
2983 return -EMSGSIZE;
97a64b45 2984
7b67c857 2985 ur = nlmsg_data(nlh);
97a64b45
MN		 2986 ur->proto = proto;
2987 memcpy(&ur->sel, sel, sizeof(ur->sel));
2988
1d1e34dd
DM		 2989 if (addr) {
2990 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2991 if (err) {
2992 nlmsg_cancel(skb, nlh);
2993 return err;
2994 }
2995 }
053c095a
JB		 2996 nlmsg_end(skb, nlh);
2997 return 0;
97a64b45
MN		 2998}
2999
db983c11
AD		 3000static int xfrm_send_report(struct net *net, u8 proto,
3001 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 3002{
3003 struct sk_buff *skb;
97a64b45 3004
7deb2264 3005 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 3006 if (skb == NULL)
3007 return -ENOMEM;
3008
3009 if (build_report(skb, proto, sel, addr) < 0)
3010 BUG();
3011
21ee543e 3012 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
97a64b45
MN		 3013}
3014
3a2dfbe8
MW		 3015static inline size_t xfrm_mapping_msgsize(void)
3016{
3017 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3018}
3019
3020static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3021 xfrm_address_t *new_saddr, __be16 new_sport)
3022{
3023 struct xfrm_user_mapping *um;
3024 struct nlmsghdr *nlh;
3025
3026 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3027 if (nlh == NULL)
3028 return -EMSGSIZE;
3029
3030 um = nlmsg_data(nlh);
3031
3032 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3033 um->id.spi = x->id.spi;
3034 um->id.family = x->props.family;
3035 um->id.proto = x->id.proto;
3036 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3037 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3038 um->new_sport = new_sport;
3039 um->old_sport = x->encap->encap_sport;
3040 um->reqid = x->props.reqid;
3041
053c095a
JB		 3042 nlmsg_end(skb, nlh);
3043 return 0;
3a2dfbe8
MW		 3044}
3045
3046static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3047 __be16 sport)
3048{
a6483b79 3049 struct net *net = xs_net(x);
3a2dfbe8
MW		 3050 struct sk_buff *skb;
3051
3052 if (x->id.proto != IPPROTO_ESP)
3053 return -EINVAL;
3054
3055 if (!x->encap)
3056 return -EINVAL;
3057
3058 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3059 if (skb == NULL)
3060 return -ENOMEM;
3061
3062 if (build_mapping(skb, x, ipaddr, sport) < 0)
3063 BUG();
3064
21ee543e 3065 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3a2dfbe8
MW		 3066}
3067
0f24558e
HG		 3068static bool xfrm_is_alive(const struct km_event *c)
3069{
3070 return (bool)xfrm_acquire_is_on(c->net);
3071}
3072
1da177e4
LT		 3073static struct xfrm_mgr netlink_mgr = {
3074 .id = "netlink",
3075 .notify = xfrm_send_state_notify,
3076 .acquire = xfrm_send_acquire,
3077 .compile_policy = xfrm_compile_policy,
3078 .notify_policy = xfrm_send_policy_notify,
97a64b45 3079 .report = xfrm_send_report,
5c79de6e 3080 .migrate = xfrm_send_migrate,
3a2dfbe8 3081 .new_mapping = xfrm_send_mapping,
0f24558e 3082 .is_alive = xfrm_is_alive,
1da177e4
LT		 3083};
3084
a6483b79 3085static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 3086{
be33690d 3087 struct sock *nlsk;
a31f2d17
PNA		 3088 struct netlink_kernel_cfg cfg = {
3089 .groups = XFRMNLGRP_MAX,
3090 .input = xfrm_netlink_rcv,
3091 };
be33690d 3092
9f00d977 3093 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
be33690d 3094 if (nlsk == NULL)
1da177e4 3095 return -ENOMEM;
d79d792e 3096 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 3097 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 3098 return 0;
3099}
3100
d79d792e 3101static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 3102{
d79d792e
EB		 3103 struct net *net;
3104 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 3105 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 3106 synchronize_net();
3107 list_for_each_entry(net, net_exit_list, exit_list)
3108 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 3109}
3110
a6483b79 3111static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 3112 .init = xfrm_user_net_init,
3113 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 3114};
3115
3116static int __init xfrm_user_init(void)
3117{
3118 int rv;
3119
3120 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3121
3122 rv = register_pernet_subsys(&xfrm_user_net_ops);
3123 if (rv < 0)
3124 return rv;
3125 rv = xfrm_register_km(&netlink_mgr);
3126 if (rv < 0)
3127 unregister_pernet_subsys(&xfrm_user_net_ops);
3128 return rv;
3129}
3130
3131static void __exit xfrm_user_exit(void)
3132{
3133 xfrm_unregister_km(&netlink_mgr);
3134 unregister_pernet_subsys(&xfrm_user_net_ops);
3135}
3136
1da177e4
LT		 3137module_init(xfrm_user_init);
3138module_exit(xfrm_user_exit);
3139MODULE_LICENSE("GPL");
4fdb3bb7 3140MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3141
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