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Merge tag 'irqchip-core-3.18' of git://git.infradead.org/users/jcooper/linux into...
[deliverable/linux.git] / net / xfrm / xfrm_user.c
CommitLineData
1da177e4
LT		 1/* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
df71837d 10 *
1da177e4
LT		 11 */
12
9409f38a 13#include <linux/crypto.h>
1da177e4
LT		 14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/net.h>
21#include <linux/skbuff.h>
1da177e4
LT		 22#include <linux/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
88fc2c84 28#include <net/netlink.h>
fa6dd8a2 29#include <net/ah.h>
1da177e4 30#include <asm/uaccess.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 32#include <linux/in6.h>
33#endif
1da177e4 34
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;
fa6dd8a2
ND		 336 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
337 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 338 return -EINVAL;
339 *props = algo->desc.sadb_alg_id;
340
341 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
342 if (!p)
343 return -ENOMEM;
344
345 strcpy(p->alg_name, algo->name);
346 if (!p->alg_trunc_len)
347 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
348
349 *algpp = p;
350 return 0;
351}
352
1a6509d9
HX		 353static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
354 struct nlattr *rta)
355{
356 struct xfrm_algo_aead *p, *ualg;
357 struct xfrm_algo_desc *algo;
358
359 if (!rta)
360 return 0;
361
362 ualg = nla_data(rta);
363
364 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
365 if (!algo)
366 return -ENOSYS;
367 *props = algo->desc.sadb_alg_id;
368
369 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
370 if (!p)
371 return -ENOMEM;
372
373 strcpy(p->alg_name, algo->name);
374 *algpp = p;
375 return 0;
376}
377
e2b19125
SK		 378static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
379 struct nlattr *rp)
380{
381 struct xfrm_replay_state_esn *up;
ecd79187 382 int ulen;
e2b19125
SK		 383
384 if (!replay_esn || !rp)
385 return 0;
386
387 up = nla_data(rp);
ecd79187 388 ulen = xfrm_replay_state_esn_len(up);
e2b19125 389
ecd79187 390 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
e2b19125
SK		 391 return -EINVAL;
392
393 return 0;
394}
395
d8647b79
SK		 396static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
397 struct xfrm_replay_state_esn **preplay_esn,
398 struct nlattr *rta)
399{
400 struct xfrm_replay_state_esn *p, *pp, *up;
ecd79187 401 int klen, ulen;
d8647b79
SK		 402
403 if (!rta)
404 return 0;
405
406 up = nla_data(rta);
ecd79187
MK		 407 klen = xfrm_replay_state_esn_len(up);
408 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
d8647b79 409
ecd79187 410 p = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 411 if (!p)
412 return -ENOMEM;
413
ecd79187 414 pp = kzalloc(klen, GFP_KERNEL);
d8647b79
SK		 415 if (!pp) {
416 kfree(p);
417 return -ENOMEM;
418 }
419
ecd79187
MK		 420 memcpy(p, up, ulen);
421 memcpy(pp, up, ulen);
422
d8647b79
SK		 423 *replay_esn = p;
424 *preplay_esn = pp;
425
426 return 0;
427}
428
661697f7 429static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 430{
df71837d
TJ		 431 int len = 0;
432
433 if (xfrm_ctx) {
434 len += sizeof(struct xfrm_user_sec_ctx);
435 len += xfrm_ctx->ctx_len;
436 }
437 return len;
438}
439
1da177e4
LT		 440static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
441{
442 memcpy(&x->id, &p->id, sizeof(x->id));
443 memcpy(&x->sel, &p->sel, sizeof(x->sel));
444 memcpy(&x->lft, &p->lft, sizeof(x->lft));
445 x->props.mode = p->mode;
33fce60d
FD		 446 x->props.replay_window = min_t(unsigned int, p->replay_window,
447 sizeof(x->replay.bitmap) * 8);
1da177e4
LT		 448 x->props.reqid = p->reqid;
449 x->props.family = p->family;
54489c14 450 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 451 x->props.flags = p->flags;
196b0036 452
ccf9b3b8 453 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 454 x->sel.family = p->family;
1da177e4
LT		 455}
456
d51d081d
JHS		 457/*
458 * someday when pfkey also has support, we could have the code
459 * somehow made shareable and move it to xfrm_state.c - JHS
460 *
461*/
e3ac104d
MK		 462static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
463 int update_esn)
d51d081d 464{
5424f32e 465 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
e3ac104d 466 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
5424f32e
TG		 467 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
468 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
469 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 470
d8647b79
SK		 471 if (re) {
472 struct xfrm_replay_state_esn *replay_esn;
473 replay_esn = nla_data(re);
474 memcpy(x->replay_esn, replay_esn,
475 xfrm_replay_state_esn_len(replay_esn));
476 memcpy(x->preplay_esn, replay_esn,
477 xfrm_replay_state_esn_len(replay_esn));
478 }
479
d51d081d
JHS		 480 if (rp) {
481 struct xfrm_replay_state *replay;
5424f32e 482 replay = nla_data(rp);
d51d081d
JHS		 483 memcpy(&x->replay, replay, sizeof(*replay));
484 memcpy(&x->preplay, replay, sizeof(*replay));
485 }
486
487 if (lt) {
488 struct xfrm_lifetime_cur *ltime;
5424f32e 489 ltime = nla_data(lt);
d51d081d
JHS		 490 x->curlft.bytes = ltime->bytes;
491 x->curlft.packets = ltime->packets;
492 x->curlft.add_time = ltime->add_time;
493 x->curlft.use_time = ltime->use_time;
494 }
495
cf5cb79f 496 if (et)
5424f32e 497 x->replay_maxage = nla_get_u32(et);
d51d081d 498
cf5cb79f 499 if (rt)
5424f32e 500 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 501}
502
fc34acd3
AD		 503static struct xfrm_state *xfrm_state_construct(struct net *net,
504 struct xfrm_usersa_info *p,
5424f32e 505 struct nlattr **attrs,
1da177e4
LT		 506 int *errp)
507{
fc34acd3 508 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 509 int err = -ENOMEM;
510
511 if (!x)
512 goto error_no_put;
513
514 copy_from_user_state(x, p);
515
a947b0a9
ND		 516 if (attrs[XFRMA_SA_EXTRA_FLAGS])
517 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
518
1a6509d9
HX		 519 if ((err = attach_aead(&x->aead, &x->props.ealgo,
520 attrs[XFRMA_ALG_AEAD])))
521 goto error;
4447bb33
MW		 522 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
523 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 524 goto error;
4447bb33
MW		 525 if (!x->props.aalgo) {
526 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
527 attrs[XFRMA_ALG_AUTH])))
528 goto error;
529 }
1da177e4
LT		 530 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
531 xfrm_ealg_get_byname,
35a7aa08 532 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 533 goto error;
534 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
535 xfrm_calg_get_byname,
35a7aa08 536 attrs[XFRMA_ALG_COMP])))
1da177e4 537 goto error;
fd21150a
TG		 538
539 if (attrs[XFRMA_ENCAP]) {
540 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
541 sizeof(*x->encap), GFP_KERNEL);
542 if (x->encap == NULL)
543 goto error;
544 }
545
35d2856b
MW		 546 if (attrs[XFRMA_TFCPAD])
547 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
548
fd21150a
TG		 549 if (attrs[XFRMA_COADDR]) {
550 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
551 sizeof(*x->coaddr), GFP_KERNEL);
552 if (x->coaddr == NULL)
553 goto error;
554 }
555
6f26b61e
JHS		 556 xfrm_mark_get(attrs, &x->mark);
557
a454f0cc 558 err = __xfrm_init_state(x, false);
1da177e4
LT		 559 if (err)
560 goto error;
561
fd21150a
TG		 562 if (attrs[XFRMA_SEC_CTX] &&
563 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 564 goto error;
565
d8647b79
SK		 566 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
567 attrs[XFRMA_REPLAY_ESN_VAL])))
568 goto error;
569
1da177e4 570 x->km.seq = p->seq;
b27aeadb 571 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 572 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 573 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 574
9fdc4883
SK		 575 if ((err = xfrm_init_replay(x)))
576 goto error;
d51d081d 577
9fdc4883 578 /* override default values from above */
e3ac104d 579 xfrm_update_ae_params(x, attrs, 0);
1da177e4
LT		 580
581 return x;
582
583error:
584 x->km.state = XFRM_STATE_DEAD;
585 xfrm_state_put(x);
586error_no_put:
587 *errp = err;
588 return NULL;
589}
590
22e70050 591static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 592 struct nlattr **attrs)
1da177e4 593{
fc34acd3 594 struct net *net = sock_net(skb->sk);
7b67c857 595 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 596 struct xfrm_state *x;
597 int err;
26b15dad 598 struct km_event c;
1da177e4 599
35a7aa08 600 err = verify_newsa_info(p, attrs);
1da177e4
LT		 601 if (err)
602 return err;
603
fc34acd3 604 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 605 if (!x)
606 return err;
607
26b15dad 608 xfrm_state_hold(x);
1da177e4
LT		 609 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
610 err = xfrm_state_add(x);
611 else
612 err = xfrm_state_update(x);
613
2e71029e 614 xfrm_audit_state_add(x, err ? 0 : 1, true);
161a09e7 615
1da177e4
LT		 616 if (err < 0) {
617 x->km.state = XFRM_STATE_DEAD;
21380b81 618 __xfrm_state_put(x);
7d6dfe1f 619 goto out;
1da177e4
LT		 620 }
621
26b15dad 622 c.seq = nlh->nlmsg_seq;
15e47304 623 c.portid = nlh->nlmsg_pid;
f60f6b8f 624 c.event = nlh->nlmsg_type;
26b15dad
JHS		 625
626 km_state_notify(x, &c);
7d6dfe1f 627out:
26b15dad 628 xfrm_state_put(x);
1da177e4
LT		 629 return err;
630}
631
fc34acd3
AD		 632static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
633 struct xfrm_usersa_id *p,
5424f32e 634 struct nlattr **attrs,
eb2971b6
MN		 635 int *errp)
636{
637 struct xfrm_state *x = NULL;
6f26b61e 638 struct xfrm_mark m;
eb2971b6 639 int err;
6f26b61e 640 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 641
642 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
643 err = -ESRCH;
6f26b61e 644 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 645 } else {
646 xfrm_address_t *saddr = NULL;
647
35a7aa08 648 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 649 if (!saddr) {
650 err = -EINVAL;
651 goto out;
652 }
653
9abbffee 654 err = -ESRCH;
6f26b61e
JHS		 655 x = xfrm_state_lookup_byaddr(net, mark,
656 &p->daddr, saddr,
221df1ed 657 p->proto, p->family);
eb2971b6
MN		 658 }
659
660 out:
661 if (!x && errp)
662 *errp = err;
663 return x;
664}
665
22e70050 666static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 667 struct nlattr **attrs)
1da177e4 668{
fc34acd3 669 struct net *net = sock_net(skb->sk);
1da177e4 670 struct xfrm_state *x;
eb2971b6 671 int err = -ESRCH;
26b15dad 672 struct km_event c;
7b67c857 673 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4 674
fc34acd3 675 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 676 if (x == NULL)
eb2971b6 677 return err;
1da177e4 678
6f68dc37 679 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 680 goto out;
681
1da177e4 682 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 683 err = -EPERM;
684 goto out;
1da177e4
LT		 685 }
686
26b15dad 687 err = xfrm_state_delete(x);
161a09e7 688
c8c05a8e
CZ		 689 if (err < 0)
690 goto out;
26b15dad
JHS		 691
692 c.seq = nlh->nlmsg_seq;
15e47304 693 c.portid = nlh->nlmsg_pid;
f60f6b8f 694 c.event = nlh->nlmsg_type;
26b15dad 695 km_state_notify(x, &c);
1da177e4 696
c8c05a8e 697out:
2e71029e 698 xfrm_audit_state_delete(x, err ? 0 : 1, true);
c8c05a8e 699 xfrm_state_put(x);
26b15dad 700 return err;
1da177e4
LT		 701}
702
703static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
704{
f778a636 705 memset(p, 0, sizeof(*p));
1da177e4
LT		 706 memcpy(&p->id, &x->id, sizeof(p->id));
707 memcpy(&p->sel, &x->sel, sizeof(p->sel));
708 memcpy(&p->lft, &x->lft, sizeof(p->lft));
709 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
710 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 711 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 712 p->mode = x->props.mode;
713 p->replay_window = x->props.replay_window;
714 p->reqid = x->props.reqid;
715 p->family = x->props.family;
716 p->flags = x->props.flags;
717 p->seq = x->km.seq;
718}
719
720struct xfrm_dump_info {
721 struct sk_buff *in_skb;
722 struct sk_buff *out_skb;
723 u32 nlmsg_seq;
724 u16 nlmsg_flags;
1da177e4
LT		 725};
726
c0144bea
TG		 727static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
728{
c0144bea
TG		 729 struct xfrm_user_sec_ctx *uctx;
730 struct nlattr *attr;
68325d3b 731 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 732
733 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
734 if (attr == NULL)
735 return -EMSGSIZE;
736
737 uctx = nla_data(attr);
738 uctx->exttype = XFRMA_SEC_CTX;
739 uctx->len = ctx_size;
740 uctx->ctx_doi = s->ctx_doi;
741 uctx->ctx_alg = s->ctx_alg;
742 uctx->ctx_len = s->ctx_len;
743 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
744
745 return 0;
746}
747
4447bb33
MW		 748static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
749{
750 struct xfrm_algo *algo;
751 struct nlattr *nla;
752
753 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
754 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
755 if (!nla)
756 return -EMSGSIZE;
757
758 algo = nla_data(nla);
4c87308b 759 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 760 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
761 algo->alg_key_len = auth->alg_key_len;
762
763 return 0;
764}
765
68325d3b
HX		 766/* Don't change this without updating xfrm_sa_len! */
767static int copy_to_user_state_extra(struct xfrm_state *x,
768 struct xfrm_usersa_info *p,
769 struct sk_buff *skb)
1da177e4 770{
1d1e34dd 771 int ret = 0;
d0fde795 772
1d1e34dd 773 copy_to_user_state(x, p);
68325d3b 774
a947b0a9
ND		 775 if (x->props.extra_flags) {
776 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
777 x->props.extra_flags);
778 if (ret)
779 goto out;
780 }
781
1d1e34dd
DM		 782 if (x->coaddr) {
783 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
784 if (ret)
785 goto out;
786 }
787 if (x->lastused) {
788 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
789 if (ret)
790 goto out;
791 }
792 if (x->aead) {
793 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
794 if (ret)
795 goto out;
796 }
797 if (x->aalg) {
798 ret = copy_to_user_auth(x->aalg, skb);
799 if (!ret)
800 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
801 xfrm_alg_auth_len(x->aalg), x->aalg);
802 if (ret)
803 goto out;
804 }
805 if (x->ealg) {
806 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
807 if (ret)
808 goto out;
809 }
810 if (x->calg) {
811 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
812 if (ret)
813 goto out;
814 }
815 if (x->encap) {
816 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
817 if (ret)
818 goto out;
819 }
820 if (x->tfcpad) {
821 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
822 if (ret)
823 goto out;
824 }
825 ret = xfrm_mark_put(skb, &x->mark);
826 if (ret)
827 goto out;
828 if (x->replay_esn) {
829 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
830 xfrm_replay_state_esn_len(x->replay_esn),
831 x->replay_esn);
832 if (ret)
833 goto out;
834 }
835 if (x->security)
836 ret = copy_sec_ctx(x->security, skb);
837out:
838 return ret;
68325d3b
HX		 839}
840
841static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
842{
843 struct xfrm_dump_info *sp = ptr;
844 struct sk_buff *in_skb = sp->in_skb;
845 struct sk_buff *skb = sp->out_skb;
846 struct xfrm_usersa_info *p;
847 struct nlmsghdr *nlh;
848 int err;
849
15e47304 850 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
68325d3b
HX		 851 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
852 if (nlh == NULL)
853 return -EMSGSIZE;
854
855 p = nlmsg_data(nlh);
856
857 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 858 if (err) {
859 nlmsg_cancel(skb, nlh);
860 return err;
861 }
9825069d 862 nlmsg_end(skb, nlh);
1da177e4 863 return 0;
1da177e4
LT		 864}
865
4c563f76
TT		 866static int xfrm_dump_sa_done(struct netlink_callback *cb)
867{
868 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
283bc9f3
FD		 869 struct sock *sk = cb->skb->sk;
870 struct net *net = sock_net(sk);
871
872 xfrm_state_walk_done(walk, net);
4c563f76
TT		 873 return 0;
874}
875
d3623099 876static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
1da177e4
LT		 877static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
878{
fc34acd3 879 struct net *net = sock_net(skb->sk);
4c563f76 880 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 881 struct xfrm_dump_info info;
882
4c563f76
TT		 883 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
884 sizeof(cb->args) - sizeof(cb->args[0]));
885
1da177e4
LT		 886 info.in_skb = cb->skb;
887 info.out_skb = skb;
888 info.nlmsg_seq = cb->nlh->nlmsg_seq;
889 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 890
891 if (!cb->args[0]) {
d3623099 892 struct nlattr *attrs[XFRMA_MAX+1];
870a2df4 893 struct xfrm_address_filter *filter = NULL;
d3623099
ND		 894 u8 proto = 0;
895 int err;
896
4c563f76 897 cb->args[0] = 1;
d3623099
ND		 898
899 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
900 xfrma_policy);
901 if (err < 0)
902 return err;
903
870a2df4 904 if (attrs[XFRMA_ADDRESS_FILTER]) {
d3623099
ND		 905 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
906 if (filter == NULL)
907 return -ENOMEM;
908
870a2df4 909 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
d3623099
ND		 910 sizeof(*filter));
911 }
912
913 if (attrs[XFRMA_PROTO])
914 proto = nla_get_u8(attrs[XFRMA_PROTO]);
915
916 xfrm_state_walk_init(walk, proto, filter);
4c563f76
TT		 917 }
918
fc34acd3 919 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 920
921 return skb->len;
922}
923
924static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
925 struct xfrm_state *x, u32 seq)
926{
927 struct xfrm_dump_info info;
928 struct sk_buff *skb;
864745d2 929 int err;
1da177e4 930
7deb2264 931 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 932 if (!skb)
933 return ERR_PTR(-ENOMEM);
934
1da177e4
LT		 935 info.in_skb = in_skb;
936 info.out_skb = skb;
937 info.nlmsg_seq = seq;
938 info.nlmsg_flags = 0;
1da177e4 939
864745d2
MK		 940 err = dump_one_state(x, 0, &info);
941 if (err) {
1da177e4 942 kfree_skb(skb);
864745d2 943 return ERR_PTR(err);
1da177e4
LT		 944 }
945
946 return skb;
947}
948
21ee543e
MK		 949/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
950 * Must be called with RCU read lock.
951 */
952static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
953 u32 pid, unsigned int group)
954{
955 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
956
957 if (nlsk)
958 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
959 else
960 return -1;
961}
962
7deb2264
TG		 963static inline size_t xfrm_spdinfo_msgsize(void)
964{
965 return NLMSG_ALIGN(4)
966 + nla_total_size(sizeof(struct xfrmu_spdinfo))
967 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
968}
969
e071041b 970static int build_spdinfo(struct sk_buff *skb, struct net *net,
15e47304 971 u32 portid, u32 seq, u32 flags)
ecfd6b18 972{
5a6d3416
JHS		 973 struct xfrmk_spdinfo si;
974 struct xfrmu_spdinfo spc;
975 struct xfrmu_spdhinfo sph;
ecfd6b18 976 struct nlmsghdr *nlh;
1d1e34dd 977 int err;
ecfd6b18
JHS		 978 u32 *f;
979
15e47304 980 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 981 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 982 return -EMSGSIZE;
983
984 f = nlmsg_data(nlh);
985 *f = flags;
e071041b 986 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 987 spc.incnt = si.incnt;
988 spc.outcnt = si.outcnt;
989 spc.fwdcnt = si.fwdcnt;
990 spc.inscnt = si.inscnt;
991 spc.outscnt = si.outscnt;
992 spc.fwdscnt = si.fwdscnt;
993 sph.spdhcnt = si.spdhcnt;
994 sph.spdhmcnt = si.spdhmcnt;
995
1d1e34dd
DM		 996 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
997 if (!err)
998 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
999 if (err) {
1000 nlmsg_cancel(skb, nlh);
1001 return err;
1002 }
ecfd6b18
JHS		 1003
1004 return nlmsg_end(skb, nlh);
ecfd6b18
JHS		 1005}
1006
1007static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1008 struct nlattr **attrs)
ecfd6b18 1009{
a6483b79 1010 struct net *net = sock_net(skb->sk);
ecfd6b18 1011 struct sk_buff *r_skb;
7b67c857 1012 u32 *flags = nlmsg_data(nlh);
15e47304 1013 u32 sportid = NETLINK_CB(skb).portid;
ecfd6b18 1014 u32 seq = nlh->nlmsg_seq;
ecfd6b18 1015
7deb2264 1016 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 1017 if (r_skb == NULL)
1018 return -ENOMEM;
1019
15e47304 1020 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
ecfd6b18
JHS		 1021 BUG();
1022
15e47304 1023 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
ecfd6b18
JHS		 1024}
1025
7deb2264
TG		 1026static inline size_t xfrm_sadinfo_msgsize(void)
1027{
1028 return NLMSG_ALIGN(4)
1029 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1030 + nla_total_size(4); /* XFRMA_SAD_CNT */
1031}
1032
e071041b 1033static int build_sadinfo(struct sk_buff *skb, struct net *net,
15e47304 1034 u32 portid, u32 seq, u32 flags)
28d8909b 1035{
af11e316
JHS		 1036 struct xfrmk_sadinfo si;
1037 struct xfrmu_sadhinfo sh;
28d8909b 1038 struct nlmsghdr *nlh;
1d1e34dd 1039 int err;
28d8909b
JHS		 1040 u32 *f;
1041
15e47304 1042 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 1043 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 1044 return -EMSGSIZE;
1045
1046 f = nlmsg_data(nlh);
1047 *f = flags;
e071041b 1048 xfrm_sad_getinfo(net, &si);
28d8909b 1049
af11e316
JHS		 1050 sh.sadhmcnt = si.sadhmcnt;
1051 sh.sadhcnt = si.sadhcnt;
1052
1d1e34dd
DM		 1053 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1054 if (!err)
1055 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1056 if (err) {
1057 nlmsg_cancel(skb, nlh);
1058 return err;
1059 }
28d8909b
JHS		 1060
1061 return nlmsg_end(skb, nlh);
28d8909b
JHS		 1062}
1063
1064static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1065 struct nlattr **attrs)
28d8909b 1066{
a6483b79 1067 struct net *net = sock_net(skb->sk);
28d8909b 1068 struct sk_buff *r_skb;
7b67c857 1069 u32 *flags = nlmsg_data(nlh);
15e47304 1070 u32 sportid = NETLINK_CB(skb).portid;
28d8909b 1071 u32 seq = nlh->nlmsg_seq;
28d8909b 1072
7deb2264 1073 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1074 if (r_skb == NULL)
1075 return -ENOMEM;
1076
15e47304 1077 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
28d8909b
JHS		 1078 BUG();
1079
15e47304 1080 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
28d8909b
JHS		 1081}
1082
22e70050 1083static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1084 struct nlattr **attrs)
1da177e4 1085{
fc34acd3 1086 struct net *net = sock_net(skb->sk);
7b67c857 1087 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1088 struct xfrm_state *x;
1089 struct sk_buff *resp_skb;
eb2971b6 1090 int err = -ESRCH;
1da177e4 1091
fc34acd3 1092 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1093 if (x == NULL)
1094 goto out_noput;
1095
1096 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1097 if (IS_ERR(resp_skb)) {
1098 err = PTR_ERR(resp_skb);
1099 } else {
15e47304 1100 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1101 }
1102 xfrm_state_put(x);
1103out_noput:
1104 return err;
1105}
1106
22e70050 1107static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1108 struct nlattr **attrs)
1da177e4 1109{
fc34acd3 1110 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1111 struct xfrm_state *x;
1112 struct xfrm_userspi_info *p;
1113 struct sk_buff *resp_skb;
1114 xfrm_address_t *daddr;
1115 int family;
1116 int err;
6f26b61e
JHS		 1117 u32 mark;
1118 struct xfrm_mark m;
1da177e4 1119
7b67c857 1120 p = nlmsg_data(nlh);
776e9dd9 1121 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1da177e4
LT		 1122 if (err)
1123 goto out_noput;
1124
1125 family = p->info.family;
1126 daddr = &p->info.id.daddr;
1127
1128 x = NULL;
6f26b61e
JHS		 1129
1130 mark = xfrm_mark_get(attrs, &m);
1da177e4 1131 if (p->info.seq) {
6f26b61e 1132 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
70e94e66 1133 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1da177e4
LT		 1134 xfrm_state_put(x);
1135 x = NULL;
1136 }
1137 }
1138
1139 if (!x)
6f26b61e 1140 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1141 p->info.id.proto, daddr,
1142 &p->info.saddr, 1,
1143 family);
1144 err = -ENOENT;
1145 if (x == NULL)
1146 goto out_noput;
1147
658b219e
HX		 1148 err = xfrm_alloc_spi(x, p->min, p->max);
1149 if (err)
1150 goto out;
1da177e4 1151
658b219e 1152 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1153 if (IS_ERR(resp_skb)) {
1154 err = PTR_ERR(resp_skb);
1155 goto out;
1156 }
1157
15e47304 1158 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1da177e4
LT		 1159
1160out:
1161 xfrm_state_put(x);
1162out_noput:
1163 return err;
1164}
1165
b798a9ed 1166static int verify_policy_dir(u8 dir)
1da177e4
LT		 1167{
1168 switch (dir) {
1169 case XFRM_POLICY_IN:
1170 case XFRM_POLICY_OUT:
1171 case XFRM_POLICY_FWD:
1172 break;
1173
1174 default:
1175 return -EINVAL;
3ff50b79 1176 }
1da177e4
LT		 1177
1178 return 0;
1179}
1180
b798a9ed 1181static int verify_policy_type(u8 type)
f7b6983f
MN		 1182{
1183 switch (type) {
1184 case XFRM_POLICY_TYPE_MAIN:
1185#ifdef CONFIG_XFRM_SUB_POLICY
1186 case XFRM_POLICY_TYPE_SUB:
1187#endif
1188 break;
1189
1190 default:
1191 return -EINVAL;
3ff50b79 1192 }
f7b6983f
MN		 1193
1194 return 0;
1195}
1196
1da177e4
LT		 1197static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1198{
e682adf0
FD		 1199 int ret;
1200
1da177e4
LT		 1201 switch (p->share) {
1202 case XFRM_SHARE_ANY:
1203 case XFRM_SHARE_SESSION:
1204 case XFRM_SHARE_USER:
1205 case XFRM_SHARE_UNIQUE:
1206 break;
1207
1208 default:
1209 return -EINVAL;
3ff50b79 1210 }
1da177e4
LT		 1211
1212 switch (p->action) {
1213 case XFRM_POLICY_ALLOW:
1214 case XFRM_POLICY_BLOCK:
1215 break;
1216
1217 default:
1218 return -EINVAL;
3ff50b79 1219 }
1da177e4
LT		 1220
1221 switch (p->sel.family) {
1222 case AF_INET:
1223 break;
1224
1225 case AF_INET6:
dfd56b8b 1226#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1227 break;
1228#else
1229 return -EAFNOSUPPORT;
1230#endif
1231
1232 default:
1233 return -EINVAL;
3ff50b79 1234 }
1da177e4 1235
e682adf0
FD		 1236 ret = verify_policy_dir(p->dir);
1237 if (ret)
1238 return ret;
1239 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1240 return -EINVAL;
1241
1242 return 0;
1da177e4
LT		 1243}
1244
5424f32e 1245static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1246{
5424f32e 1247 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1248 struct xfrm_user_sec_ctx *uctx;
1249
1250 if (!rt)
1251 return 0;
1252
5424f32e 1253 uctx = nla_data(rt);
52a4c640 1254 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
df71837d
TJ		 1255}
1256
1da177e4
LT		 1257static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1258 int nr)
1259{
1260 int i;
1261
1262 xp->xfrm_nr = nr;
1263 for (i = 0; i < nr; i++, ut++) {
1264 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1265
1266 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1267 memcpy(&t->saddr, &ut->saddr,
1268 sizeof(xfrm_address_t));
1269 t->reqid = ut->reqid;
1270 t->mode = ut->mode;
1271 t->share = ut->share;
1272 t->optional = ut->optional;
1273 t->aalgos = ut->aalgos;
1274 t->ealgos = ut->ealgos;
1275 t->calgos = ut->calgos;
c5d18e98
HX		 1276 /* If all masks are ~0, then we allow all algorithms. */
1277 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1278 t->encap_family = ut->family;
1da177e4
LT		 1279 }
1280}
1281
b4ad86bf
DM		 1282static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1283{
1284 int i;
1285
1286 if (nr > XFRM_MAX_DEPTH)
1287 return -EINVAL;
1288
1289 for (i = 0; i < nr; i++) {
1290 /* We never validated the ut->family value, so many
1291 * applications simply leave it at zero. The check was
1292 * never made and ut->family was ignored because all
1293 * templates could be assumed to have the same family as
1294 * the policy itself. Now that we will have ipv4-in-ipv6
1295 * and ipv6-in-ipv4 tunnels, this is no longer true.
1296 */
1297 if (!ut[i].family)
1298 ut[i].family = family;
1299
1300 switch (ut[i].family) {
1301 case AF_INET:
1302 break;
dfd56b8b 1303#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1304 case AF_INET6:
1305 break;
1306#endif
1307 default:
1308 return -EINVAL;
3ff50b79 1309 }
b4ad86bf
DM		 1310 }
1311
1312 return 0;
1313}
1314
5424f32e 1315static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1316{
5424f32e 1317 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1318
1319 if (!rt) {
1320 pol->xfrm_nr = 0;
1321 } else {
5424f32e
TG		 1322 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1323 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1324 int err;
1da177e4 1325
b4ad86bf
DM		 1326 err = validate_tmpl(nr, utmpl, pol->family);
1327 if (err)
1328 return err;
1da177e4 1329
5424f32e 1330 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1331 }
1332 return 0;
1333}
1334
5424f32e 1335static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1336{
5424f32e 1337 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1338 struct xfrm_userpolicy_type *upt;
b798a9ed 1339 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1340 int err;
1341
1342 if (rt) {
5424f32e 1343 upt = nla_data(rt);
f7b6983f
MN		 1344 type = upt->type;
1345 }
1346
1347 err = verify_policy_type(type);
1348 if (err)
1349 return err;
1350
1351 *tp = type;
1352 return 0;
1353}
1354
1da177e4
LT		 1355static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1356{
1357 xp->priority = p->priority;
1358 xp->index = p->index;
1359 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1360 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1361 xp->action = p->action;
1362 xp->flags = p->flags;
1363 xp->family = p->sel.family;
1364 /* XXX xp->share = p->share; */
1365}
1366
1367static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1368{
7b789836 1369 memset(p, 0, sizeof(*p));
1da177e4
LT		 1370 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1371 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1372 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1373 p->priority = xp->priority;
1374 p->index = xp->index;
1375 p->sel.family = xp->family;
1376 p->dir = dir;
1377 p->action = xp->action;
1378 p->flags = xp->flags;
1379 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1380}
1381
fc34acd3 1382static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1383{
fc34acd3 1384 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1385 int err;
1386
1387 if (!xp) {
1388 *errp = -ENOMEM;
1389 return NULL;
1390 }
1391
1392 copy_from_user_policy(xp, p);
df71837d 1393
35a7aa08 1394 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1395 if (err)
1396 goto error;
1397
35a7aa08
TG		 1398 if (!(err = copy_from_user_tmpl(xp, attrs)))
1399 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1400 if (err)
1401 goto error;
1da177e4 1402
295fae56
JHS		 1403 xfrm_mark_get(attrs, &xp->mark);
1404
1da177e4 1405 return xp;
f7b6983f
MN		 1406 error:
1407 *errp = err;
12a169e7 1408 xp->walk.dead = 1;
64c31b3f 1409 xfrm_policy_destroy(xp);
f7b6983f 1410 return NULL;
1da177e4
LT		 1411}
1412
22e70050 1413static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1414 struct nlattr **attrs)
1da177e4 1415{
fc34acd3 1416 struct net *net = sock_net(skb->sk);
7b67c857 1417 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1418 struct xfrm_policy *xp;
26b15dad 1419 struct km_event c;
1da177e4
LT		 1420 int err;
1421 int excl;
1422
1423 err = verify_newpolicy_info(p);
df71837d
TJ		 1424 if (err)
1425 return err;
35a7aa08 1426 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1427 if (err)
1428 return err;
1429
fc34acd3 1430 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1431 if (!xp)
1432 return err;
1433
25985edc 1434 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1435 * Aha! this is anti-netlink really i.e more pfkey derived
1436 * in netlink excl is a flag and you wouldnt need
1437 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1438 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1439 err = xfrm_policy_insert(p->dir, xp, excl);
2e71029e 1440 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
161a09e7 1441
1da177e4 1442 if (err) {
03e1ad7b 1443 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1444 kfree(xp);
1445 return err;
1446 }
1447
f60f6b8f 1448 c.event = nlh->nlmsg_type;
26b15dad 1449 c.seq = nlh->nlmsg_seq;
15e47304 1450 c.portid = nlh->nlmsg_pid;
26b15dad
JHS		 1451 km_policy_notify(xp, p->dir, &c);
1452
1da177e4
LT		 1453 xfrm_pol_put(xp);
1454
1455 return 0;
1456}
1457
1458static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1459{
1460 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1461 int i;
1462
1463 if (xp->xfrm_nr == 0)
1464 return 0;
1465
1466 for (i = 0; i < xp->xfrm_nr; i++) {
1467 struct xfrm_user_tmpl *up = &vec[i];
1468 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1469
1f86840f 1470 memset(up, 0, sizeof(*up));
1da177e4 1471 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1472 up->family = kp->encap_family;
1da177e4
LT		 1473 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1474 up->reqid = kp->reqid;
1475 up->mode = kp->mode;
1476 up->share = kp->share;
1477 up->optional = kp->optional;
1478 up->aalgos = kp->aalgos;
1479 up->ealgos = kp->ealgos;
1480 up->calgos = kp->calgos;
1481 }
df71837d 1482
c0144bea
TG		 1483 return nla_put(skb, XFRMA_TMPL,
1484 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1485}
1486
1487static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1488{
1489 if (x->security) {
1490 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1491 }
1492 return 0;
0d681623 1493}
df71837d 1494
0d681623
SH		 1495static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1496{
1d1e34dd 1497 if (xp->security)
0d681623 1498 return copy_sec_ctx(xp->security, skb);
0d681623 1499 return 0;
df71837d 1500}
cfbfd45a
TG		 1501static inline size_t userpolicy_type_attrsize(void)
1502{
1503#ifdef CONFIG_XFRM_SUB_POLICY
1504 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1505#else
1506 return 0;
1507#endif
1508}
df71837d 1509
f7b6983f 1510#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1511static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1512{
c0144bea
TG		 1513 struct xfrm_userpolicy_type upt = {
1514 .type = type,
1515 };
f7b6983f 1516
c0144bea 1517 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1518}
1519
1520#else
b798a9ed 1521static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1522{
1523 return 0;
1524}
1525#endif
1526
1da177e4
LT		 1527static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1528{
1529 struct xfrm_dump_info *sp = ptr;
1530 struct xfrm_userpolicy_info *p;
1531 struct sk_buff *in_skb = sp->in_skb;
1532 struct sk_buff *skb = sp->out_skb;
1533 struct nlmsghdr *nlh;
1d1e34dd 1534 int err;
1da177e4 1535
15e47304 1536 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
79b8b7f4
TG		 1537 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1538 if (nlh == NULL)
1539 return -EMSGSIZE;
1da177e4 1540
7b67c857 1541 p = nlmsg_data(nlh);
1da177e4 1542 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1543 err = copy_to_user_tmpl(xp, skb);
1544 if (!err)
1545 err = copy_to_user_sec_ctx(xp, skb);
1546 if (!err)
1547 err = copy_to_user_policy_type(xp->type, skb);
1548 if (!err)
1549 err = xfrm_mark_put(skb, &xp->mark);
1550 if (err) {
1551 nlmsg_cancel(skb, nlh);
1552 return err;
1553 }
9825069d 1554 nlmsg_end(skb, nlh);
1da177e4 1555 return 0;
1da177e4
LT		 1556}
1557
4c563f76
TT		 1558static int xfrm_dump_policy_done(struct netlink_callback *cb)
1559{
1560 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
283bc9f3 1561 struct net *net = sock_net(cb->skb->sk);
4c563f76 1562
283bc9f3 1563 xfrm_policy_walk_done(walk, net);
4c563f76
TT		 1564 return 0;
1565}
1566
1da177e4
LT		 1567static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1568{
fc34acd3 1569 struct net *net = sock_net(skb->sk);
4c563f76 1570 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1571 struct xfrm_dump_info info;
1572
4c563f76
TT		 1573 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1574 sizeof(cb->args) - sizeof(cb->args[0]));
1575
1da177e4
LT		 1576 info.in_skb = cb->skb;
1577 info.out_skb = skb;
1578 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1579 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1580
1581 if (!cb->args[0]) {
1582 cb->args[0] = 1;
1583 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1584 }
1585
fc34acd3 1586 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1587
1588 return skb->len;
1589}
1590
1591static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1592 struct xfrm_policy *xp,
1593 int dir, u32 seq)
1594{
1595 struct xfrm_dump_info info;
1596 struct sk_buff *skb;
c2546372 1597 int err;
1da177e4 1598
7deb2264 1599 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1600 if (!skb)
1601 return ERR_PTR(-ENOMEM);
1602
1da177e4
LT		 1603 info.in_skb = in_skb;
1604 info.out_skb = skb;
1605 info.nlmsg_seq = seq;
1606 info.nlmsg_flags = 0;
1da177e4 1607
c2546372
MK		 1608 err = dump_one_policy(xp, dir, 0, &info);
1609 if (err) {
1da177e4 1610 kfree_skb(skb);
c2546372 1611 return ERR_PTR(err);
1da177e4
LT		 1612 }
1613
1614 return skb;
1615}
1616
22e70050 1617static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1618 struct nlattr **attrs)
1da177e4 1619{
fc34acd3 1620 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1621 struct xfrm_policy *xp;
1622 struct xfrm_userpolicy_id *p;
b798a9ed 1623 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1624 int err;
26b15dad 1625 struct km_event c;
1da177e4 1626 int delete;
295fae56
JHS		 1627 struct xfrm_mark m;
1628 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1629
7b67c857 1630 p = nlmsg_data(nlh);
1da177e4
LT		 1631 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1632
35a7aa08 1633 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1634 if (err)
1635 return err;
1636
1da177e4
LT		 1637 err = verify_policy_dir(p->dir);
1638 if (err)
1639 return err;
1640
1641 if (p->index)
295fae56 1642 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1643 else {
5424f32e 1644 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1645 struct xfrm_sec_ctx *ctx;
df71837d 1646
35a7aa08 1647 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1648 if (err)
1649 return err;
1650
2c8dd116 1651 ctx = NULL;
df71837d 1652 if (rt) {
5424f32e 1653 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1654
52a4c640 1655 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 1656 if (err)
df71837d 1657 return err;
2c8dd116 1658 }
295fae56 1659 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1660 ctx, delete, &err);
03e1ad7b 1661 security_xfrm_policy_free(ctx);
df71837d 1662 }
1da177e4
LT		 1663 if (xp == NULL)
1664 return -ENOENT;
1665
1666 if (!delete) {
1667 struct sk_buff *resp_skb;
1668
1669 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1670 if (IS_ERR(resp_skb)) {
1671 err = PTR_ERR(resp_skb);
1672 } else {
a6483b79 1673 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
15e47304 1674 NETLINK_CB(skb).portid);
1da177e4 1675 }
26b15dad 1676 } else {
2e71029e 1677 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
13fcfbb0
DM		 1678
1679 if (err != 0)
c8c05a8e 1680 goto out;
13fcfbb0 1681
e7443892 1682 c.data.byid = p->index;
f60f6b8f 1683 c.event = nlh->nlmsg_type;
26b15dad 1684 c.seq = nlh->nlmsg_seq;
15e47304 1685 c.portid = nlh->nlmsg_pid;
26b15dad 1686 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1687 }
1688
c8c05a8e 1689out:
ef41aaa0 1690 xfrm_pol_put(xp);
e4c17216
PM		 1691 if (delete && err == 0)
1692 xfrm_garbage_collect(net);
1da177e4
LT		 1693 return err;
1694}
1695
22e70050 1696static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1697 struct nlattr **attrs)
1da177e4 1698{
fc34acd3 1699 struct net *net = sock_net(skb->sk);
26b15dad 1700 struct km_event c;
7b67c857 1701 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
4aa2e62c 1702 int err;
1da177e4 1703
2e71029e 1704 err = xfrm_state_flush(net, p->proto, true);
9e64cc95
JHS		 1705 if (err) {
1706 if (err == -ESRCH) /* empty table */
1707 return 0;
069c474e 1708 return err;
9e64cc95 1709 }
bf08867f 1710 c.data.proto = p->proto;
f60f6b8f 1711 c.event = nlh->nlmsg_type;
26b15dad 1712 c.seq = nlh->nlmsg_seq;
15e47304 1713 c.portid = nlh->nlmsg_pid;
7067802e 1714 c.net = net;
26b15dad
JHS		 1715 km_state_notify(NULL, &c);
1716
1da177e4
LT		 1717 return 0;
1718}
1719
d8647b79 1720static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1721{
d8647b79
SK		 1722 size_t replay_size = x->replay_esn ?
1723 xfrm_replay_state_esn_len(x->replay_esn) :
1724 sizeof(struct xfrm_replay_state);
1725
7deb2264 1726 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1727 + nla_total_size(replay_size)
7deb2264 1728 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1729 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1730 + nla_total_size(4) /* XFRM_AE_RTHR */
1731 + nla_total_size(4); /* XFRM_AE_ETHR */
1732}
d51d081d 1733
214e005b 1734static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1735{
1736 struct xfrm_aevent_id *id;
1737 struct nlmsghdr *nlh;
1d1e34dd 1738 int err;
d51d081d 1739
15e47304 1740 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
79b8b7f4
TG		 1741 if (nlh == NULL)
1742 return -EMSGSIZE;
d51d081d 1743
7b67c857 1744 id = nlmsg_data(nlh);
9b7a787d 1745 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
d51d081d
JHS		 1746 id->sa_id.spi = x->id.spi;
1747 id->sa_id.family = x->props.family;
1748 id->sa_id.proto = x->id.proto;
9b7a787d 1749 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2b5f6dcc 1750 id->reqid = x->props.reqid;
d51d081d
JHS		 1751 id->flags = c->data.aevent;
1752
d0fde795 1753 if (x->replay_esn) {
1d1e34dd
DM		 1754 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1755 xfrm_replay_state_esn_len(x->replay_esn),
1756 x->replay_esn);
d0fde795 1757 } else {
1d1e34dd
DM		 1758 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1759 &x->replay);
d0fde795 1760 }
1d1e34dd
DM		 1761 if (err)
1762 goto out_cancel;
1763 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1764 if (err)
1765 goto out_cancel;
d51d081d 1766
1d1e34dd
DM		 1767 if (id->flags & XFRM_AE_RTHR) {
1768 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1769 if (err)
1770 goto out_cancel;
1771 }
1772 if (id->flags & XFRM_AE_ETHR) {
1773 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1774 x->replay_maxage * 10 / HZ);
1775 if (err)
1776 goto out_cancel;
1777 }
1778 err = xfrm_mark_put(skb, &x->mark);
1779 if (err)
1780 goto out_cancel;
6f26b61e 1781
9825069d 1782 return nlmsg_end(skb, nlh);
d51d081d 1783
1d1e34dd 1784out_cancel:
9825069d 1785 nlmsg_cancel(skb, nlh);
1d1e34dd 1786 return err;
d51d081d
JHS		 1787}
1788
22e70050 1789static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1790 struct nlattr **attrs)
d51d081d 1791{
fc34acd3 1792 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1793 struct xfrm_state *x;
1794 struct sk_buff *r_skb;
1795 int err;
1796 struct km_event c;
6f26b61e
JHS		 1797 u32 mark;
1798 struct xfrm_mark m;
7b67c857 1799 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1800 struct xfrm_usersa_id *id = &p->sa_id;
1801
6f26b61e
JHS		 1802 mark = xfrm_mark_get(attrs, &m);
1803
1804 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1805 if (x == NULL)
d51d081d 1806 return -ESRCH;
d8647b79
SK		 1807
1808 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1809 if (r_skb == NULL) {
1810 xfrm_state_put(x);
1811 return -ENOMEM;
d51d081d
JHS		 1812 }
1813
1814 /*
1815 * XXX: is this lock really needed - none of the other
1816 * gets lock (the concern is things getting updated
1817 * while we are still reading) - jhs
1818 */
1819 spin_lock_bh(&x->lock);
1820 c.data.aevent = p->flags;
1821 c.seq = nlh->nlmsg_seq;
15e47304 1822 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1823
1824 if (build_aevent(r_skb, x, &c) < 0)
1825 BUG();
15e47304 1826 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
d51d081d
JHS		 1827 spin_unlock_bh(&x->lock);
1828 xfrm_state_put(x);
1829 return err;
1830}
1831
22e70050 1832static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1833 struct nlattr **attrs)
d51d081d 1834{
fc34acd3 1835 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1836 struct xfrm_state *x;
1837 struct km_event c;
02d0892f 1838 int err = -EINVAL;
6f26b61e
JHS		 1839 u32 mark = 0;
1840 struct xfrm_mark m;
7b67c857 1841 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1842 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1843 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1844 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1845
d8647b79 1846 if (!lt && !rp && !re)
d51d081d
JHS		 1847 return err;
1848
1849 /* pedantic mode - thou shalt sayeth replaceth */
1850 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1851 return err;
1852
6f26b61e
JHS		 1853 mark = xfrm_mark_get(attrs, &m);
1854
1855 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1856 if (x == NULL)
1857 return -ESRCH;
1858
1859 if (x->km.state != XFRM_STATE_VALID)
1860 goto out;
1861
4479ff76 1862 err = xfrm_replay_verify_len(x->replay_esn, re);
e2b19125
SK		 1863 if (err)
1864 goto out;
1865
d51d081d 1866 spin_lock_bh(&x->lock);
e3ac104d 1867 xfrm_update_ae_params(x, attrs, 1);
d51d081d 1868 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1869
1870 c.event = nlh->nlmsg_type;
1871 c.seq = nlh->nlmsg_seq;
15e47304 1872 c.portid = nlh->nlmsg_pid;
d51d081d
JHS		 1873 c.data.aevent = XFRM_AE_CU;
1874 km_state_notify(x, &c);
1875 err = 0;
1876out:
1877 xfrm_state_put(x);
1878 return err;
1879}
1880
22e70050 1881static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1882 struct nlattr **attrs)
1da177e4 1883{
fc34acd3 1884 struct net *net = sock_net(skb->sk);
f7b6983f 1885 struct km_event c;
b798a9ed 1886 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1887 int err;
1888
35a7aa08 1889 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1890 if (err)
1891 return err;
26b15dad 1892
2e71029e 1893 err = xfrm_policy_flush(net, type, true);
2f1eb65f
JHS		 1894 if (err) {
1895 if (err == -ESRCH) /* empty table */
1896 return 0;
069c474e 1897 return err;
2f1eb65f
JHS		 1898 }
1899
f7b6983f 1900 c.data.type = type;
f60f6b8f 1901 c.event = nlh->nlmsg_type;
26b15dad 1902 c.seq = nlh->nlmsg_seq;
15e47304 1903 c.portid = nlh->nlmsg_pid;
7067802e 1904 c.net = net;
26b15dad 1905 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1906 return 0;
1907}
1908
22e70050 1909static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1910 struct nlattr **attrs)
6c5c8ca7 1911{
fc34acd3 1912 struct net *net = sock_net(skb->sk);
6c5c8ca7 1913 struct xfrm_policy *xp;
7b67c857 1914 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1915 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1916 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1917 int err = -ENOENT;
295fae56
JHS		 1918 struct xfrm_mark m;
1919 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1920
35a7aa08 1921 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1922 if (err)
1923 return err;
1924
c8bf4d04
TT		 1925 err = verify_policy_dir(p->dir);
1926 if (err)
1927 return err;
1928
6c5c8ca7 1929 if (p->index)
295fae56 1930 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1931 else {
5424f32e 1932 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1933 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1934
35a7aa08 1935 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1936 if (err)
1937 return err;
1938
2c8dd116 1939 ctx = NULL;
6c5c8ca7 1940 if (rt) {
5424f32e 1941 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1942
52a4c640 1943 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
03e1ad7b 1944 if (err)
6c5c8ca7 1945 return err;
2c8dd116 1946 }
295fae56 1947 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 1948 &p->sel, ctx, 0, &err);
03e1ad7b 1949 security_xfrm_policy_free(ctx);
6c5c8ca7 1950 }
6c5c8ca7 1951 if (xp == NULL)
ef41aaa0 1952 return -ENOENT;
03e1ad7b 1953
ea2dea9d 1954 if (unlikely(xp->walk.dead))
6c5c8ca7 1955 goto out;
6c5c8ca7 1956
6c5c8ca7
JHS		 1957 err = 0;
1958 if (up->hard) {
1959 xfrm_policy_delete(xp, p->dir);
2e71029e 1960 xfrm_audit_policy_delete(xp, 1, true);
6c5c8ca7
JHS		 1961 } else {
1962 // reset the timers here?
62db5cfd 1963 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7 1964 }
c6bb8136 1965 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
6c5c8ca7
JHS		 1966
1967out:
1968 xfrm_pol_put(xp);
1969 return err;
1970}
1971
22e70050 1972static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1973 struct nlattr **attrs)
53bc6b4d 1974{
fc34acd3 1975 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 1976 struct xfrm_state *x;
1977 int err;
7b67c857 1978 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 1979 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 1980 struct xfrm_mark m;
928497f0 1981 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 1982
6f26b61e 1983 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 1984
3a765aa5 1985 err = -ENOENT;
53bc6b4d
JHS		 1986 if (x == NULL)
1987 return err;
1988
53bc6b4d 1989 spin_lock_bh(&x->lock);
3a765aa5 1990 err = -EINVAL;
53bc6b4d
JHS		 1991 if (x->km.state != XFRM_STATE_VALID)
1992 goto out;
c6bb8136 1993 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
53bc6b4d 1994
161a09e7 1995 if (ue->hard) {
53bc6b4d 1996 __xfrm_state_delete(x);
2e71029e 1997 xfrm_audit_state_delete(x, 1, true);
161a09e7 1998 }
3a765aa5 1999 err = 0;
53bc6b4d
JHS		 2000out:
2001 spin_unlock_bh(&x->lock);
2002 xfrm_state_put(x);
2003 return err;
2004}
2005
22e70050 2006static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2007 struct nlattr **attrs)
980ebd25 2008{
fc34acd3 2009 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 2010 struct xfrm_policy *xp;
2011 struct xfrm_user_tmpl *ut;
2012 int i;
5424f32e 2013 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 2014 struct xfrm_mark mark;
980ebd25 2015
7b67c857 2016 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 2017 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 2018 int err = -ENOMEM;
2019
2020 if (!x)
d8eb9307 2021 goto nomem;
980ebd25 2022
6f26b61e
JHS		 2023 xfrm_mark_get(attrs, &mark);
2024
980ebd25 2025 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 2026 if (err)
2027 goto bad_policy;
980ebd25
JHS		 2028
2029 /* build an XP */
fc34acd3 2030 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2031 if (!xp)
2032 goto free_state;
980ebd25
JHS		 2033
2034 memcpy(&x->id, &ua->id, sizeof(ua->id));
2035 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2036 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2037 xp->mark.m = x->mark.m = mark.m;
2038 xp->mark.v = x->mark.v = mark.v;
5424f32e 2039 ut = nla_data(rt);
980ebd25
JHS		 2040 /* extract the templates and for each call km_key */
2041 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2042 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2043 memcpy(&x->id, &t->id, sizeof(x->id));
2044 x->props.mode = t->mode;
2045 x->props.reqid = t->reqid;
2046 x->props.family = ut->family;
2047 t->aalgos = ua->aalgos;
2048 t->ealgos = ua->ealgos;
2049 t->calgos = ua->calgos;
2050 err = km_query(x, t, xp);
2051
2052 }
2053
2054 kfree(x);
2055 kfree(xp);
2056
2057 return 0;
d8eb9307
IJ		 2058
2059bad_policy:
62db5cfd 2060 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2061free_state:
2062 kfree(x);
2063nomem:
2064 return err;
980ebd25
JHS		 2065}
2066
5c79de6e 2067#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2068static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2069 struct xfrm_kmaddress *k,
5424f32e 2070 struct nlattr **attrs, int *num)
5c79de6e 2071{
5424f32e 2072 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2073 struct xfrm_user_migrate *um;
2074 int i, num_migrate;
2075
13c1d189
AE		 2076 if (k != NULL) {
2077 struct xfrm_user_kmaddress *uk;
2078
2079 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2080 memcpy(&k->local, &uk->local, sizeof(k->local));
2081 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2082 k->family = uk->family;
2083 k->reserved = uk->reserved;
2084 }
2085
5424f32e
TG		 2086 um = nla_data(rt);
2087 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2088
2089 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2090 return -EINVAL;
2091
2092 for (i = 0; i < num_migrate; i++, um++, ma++) {
2093 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2094 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2095 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2096 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2097
2098 ma->proto = um->proto;
2099 ma->mode = um->mode;
2100 ma->reqid = um->reqid;
2101
2102 ma->old_family = um->old_family;
2103 ma->new_family = um->new_family;
2104 }
2105
2106 *num = i;
2107 return 0;
2108}
2109
2110static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2111 struct nlattr **attrs)
5c79de6e 2112{
7b67c857 2113 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2114 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2115 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2116 u8 type;
2117 int err;
2118 int n = 0;
8d549c4f 2119 struct net *net = sock_net(skb->sk);
5c79de6e 2120
35a7aa08 2121 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2122 return -EINVAL;
5c79de6e 2123
13c1d189
AE		 2124 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2125
5424f32e 2126 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2127 if (err)
2128 return err;
2129
13c1d189 2130 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2131 if (err)
2132 return err;
2133
2134 if (!n)
2135 return 0;
2136
8d549c4f 2137 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
5c79de6e
SS		 2138
2139 return 0;
2140}
2141#else
2142static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2143 struct nlattr **attrs)
5c79de6e
SS		 2144{
2145 return -ENOPROTOOPT;
2146}
2147#endif
2148
2149#ifdef CONFIG_XFRM_MIGRATE
183cad12 2150static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2151{
2152 struct xfrm_user_migrate um;
2153
2154 memset(&um, 0, sizeof(um));
2155 um.proto = m->proto;
2156 um.mode = m->mode;
2157 um.reqid = m->reqid;
2158 um.old_family = m->old_family;
2159 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2160 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2161 um.new_family = m->new_family;
2162 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2163 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2164
c0144bea 2165 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2166}
2167
183cad12 2168static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2169{
2170 struct xfrm_user_kmaddress uk;
2171
2172 memset(&uk, 0, sizeof(uk));
2173 uk.family = k->family;
2174 uk.reserved = k->reserved;
2175 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2176 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2177
2178 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2179}
2180
2181static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2182{
2183 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2184 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2185 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2186 + userpolicy_type_attrsize();
7deb2264
TG		 2187}
2188
183cad12
DM		 2189static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2190 int num_migrate, const struct xfrm_kmaddress *k,
2191 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2192{
183cad12 2193 const struct xfrm_migrate *mp;
5c79de6e
SS		 2194 struct xfrm_userpolicy_id *pol_id;
2195 struct nlmsghdr *nlh;
1d1e34dd 2196 int i, err;
5c79de6e 2197
79b8b7f4
TG		 2198 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2199 if (nlh == NULL)
2200 return -EMSGSIZE;
5c79de6e 2201
7b67c857 2202 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2203 /* copy data from selector, dir, and type to the pol_id */
2204 memset(pol_id, 0, sizeof(*pol_id));
2205 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2206 pol_id->dir = dir;
2207
1d1e34dd
DM		 2208 if (k != NULL) {
2209 err = copy_to_user_kmaddress(k, skb);
2210 if (err)
2211 goto out_cancel;
2212 }
2213 err = copy_to_user_policy_type(type, skb);
2214 if (err)
2215 goto out_cancel;
5c79de6e 2216 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2217 err = copy_to_user_migrate(mp, skb);
2218 if (err)
2219 goto out_cancel;
5c79de6e
SS		 2220 }
2221
9825069d 2222 return nlmsg_end(skb, nlh);
1d1e34dd
DM		 2223
2224out_cancel:
9825069d 2225 nlmsg_cancel(skb, nlh);
1d1e34dd 2226 return err;
5c79de6e
SS		 2227}
2228
183cad12
DM		 2229static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2230 const struct xfrm_migrate *m, int num_migrate,
2231 const struct xfrm_kmaddress *k)
5c79de6e 2232{
a6483b79 2233 struct net *net = &init_net;
5c79de6e 2234 struct sk_buff *skb;
5c79de6e 2235
13c1d189 2236 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2237 if (skb == NULL)
2238 return -ENOMEM;
2239
2240 /* build migrate */
13c1d189 2241 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2242 BUG();
2243
21ee543e 2244 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
5c79de6e
SS		 2245}
2246#else
183cad12
DM		 2247static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2248 const struct xfrm_migrate *m, int num_migrate,
2249 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2250{
2251 return -ENOPROTOOPT;
2252}
2253#endif
d51d081d 2254
a7bd9a45 2255#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2256
2257static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2258 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2259 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2260 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2261 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2262 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2263 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2264 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2265 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2266 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2267 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2268 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2269 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2270 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2271 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2272 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2273 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2274 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2275 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 2276 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2277 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2278};
2279
492b558b
TG		 2280#undef XMSGSIZE
2281
cf5cb79f 2282static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2283 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2284 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2285 [XFRMA_LASTUSED] = { .type = NLA_U64},
2286 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2287 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2288 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2289 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2290 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2291 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2292 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2293 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2294 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2295 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2296 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2297 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2298 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2299 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2300 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2301 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2302 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2303 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2304 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2305 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
a947b0a9 2306 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
d3623099 2307 [XFRMA_PROTO] = { .type = NLA_U8 },
870a2df4 2308 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
cf5cb79f
TG		 2309};
2310
05600a79 2311static const struct xfrm_link {
5424f32e 2312 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2313 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2314 int (*done)(struct netlink_callback *);
492b558b
TG		 2315} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2316 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2317 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2318 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2319 .dump = xfrm_dump_sa,
2320 .done = xfrm_dump_sa_done },
492b558b
TG		 2321 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2322 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2323 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2324 .dump = xfrm_dump_policy,
2325 .done = xfrm_dump_policy_done },
492b558b 2326 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2327 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2328 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2329 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2330 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2331 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2332 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2333 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2334 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2335 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2336 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2337 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 2338 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2339};
2340
1d00a4eb 2341static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2342{
a6483b79 2343 struct net *net = sock_net(skb->sk);
35a7aa08 2344 struct nlattr *attrs[XFRMA_MAX+1];
05600a79 2345 const struct xfrm_link *link;
a7bd9a45 2346 int type, err;
1da177e4 2347
1da177e4 2348 type = nlh->nlmsg_type;
1da177e4 2349 if (type > XFRM_MSG_MAX)
1d00a4eb 2350 return -EINVAL;
1da177e4
LT		 2351
2352 type -= XFRM_MSG_BASE;
2353 link = &xfrm_dispatch[type];
2354
2355 /* All operations require privileges, even GET */
90f62cf3 2356 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
1d00a4eb 2357 return -EPERM;
1da177e4 2358
492b558b
TG		 2359 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2360 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2361 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2362 if (link->dump == NULL)
1d00a4eb 2363 return -EINVAL;
88fc2c84 2364
80d326fa
PNA		 2365 {
2366 struct netlink_dump_control c = {
2367 .dump = link->dump,
2368 .done = link->done,
2369 };
2370 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2371 }
1da177e4
LT		 2372 }
2373
35a7aa08 2374 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 2375 xfrma_policy);
a7bd9a45
TG		 2376 if (err < 0)
2377 return err;
1da177e4
LT		 2378
2379 if (link->doit == NULL)
1d00a4eb 2380 return -EINVAL;
1da177e4 2381
5424f32e 2382 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2383}
2384
cd40b7d3 2385static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2386{
283bc9f3
FD		 2387 struct net *net = sock_net(skb->sk);
2388
2389 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
cd40b7d3 2390 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
283bc9f3 2391 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
1da177e4
LT		 2392}
2393
7deb2264
TG		 2394static inline size_t xfrm_expire_msgsize(void)
2395{
6f26b61e
JHS		 2396 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2397 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2398}
2399
214e005b 2400static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2401{
2402 struct xfrm_user_expire *ue;
2403 struct nlmsghdr *nlh;
1d1e34dd 2404 int err;
1da177e4 2405
15e47304 2406 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
79b8b7f4
TG		 2407 if (nlh == NULL)
2408 return -EMSGSIZE;
1da177e4 2409
7b67c857 2410 ue = nlmsg_data(nlh);
1da177e4 2411 copy_to_user_state(x, &ue->state);
d51d081d 2412 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2413
1d1e34dd
DM		 2414 err = xfrm_mark_put(skb, &x->mark);
2415 if (err)
2416 return err;
6f26b61e 2417
9825069d 2418 return nlmsg_end(skb, nlh);
1da177e4
LT		 2419}
2420
214e005b 2421static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2422{
fc34acd3 2423 struct net *net = xs_net(x);
1da177e4
LT		 2424 struct sk_buff *skb;
2425
7deb2264 2426 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2427 if (skb == NULL)
2428 return -ENOMEM;
2429
6f26b61e
JHS		 2430 if (build_expire(skb, x, c) < 0) {
2431 kfree_skb(skb);
2432 return -EMSGSIZE;
2433 }
1da177e4 2434
21ee543e 2435 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
1da177e4
LT		 2436}
2437
214e005b 2438static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2439{
fc34acd3 2440 struct net *net = xs_net(x);
d51d081d 2441 struct sk_buff *skb;
d51d081d 2442
d8647b79 2443 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2444 if (skb == NULL)
2445 return -ENOMEM;
2446
2447 if (build_aevent(skb, x, c) < 0)
2448 BUG();
2449
21ee543e 2450 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
d51d081d
JHS		 2451}
2452
214e005b 2453static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2454{
7067802e 2455 struct net *net = c->net;
26b15dad
JHS		 2456 struct xfrm_usersa_flush *p;
2457 struct nlmsghdr *nlh;
2458 struct sk_buff *skb;
7deb2264 2459 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2460
7deb2264 2461 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2462 if (skb == NULL)
2463 return -ENOMEM;
26b15dad 2464
15e47304 2465 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
79b8b7f4
TG		 2466 if (nlh == NULL) {
2467 kfree_skb(skb);
2468 return -EMSGSIZE;
2469 }
26b15dad 2470
7b67c857 2471 p = nlmsg_data(nlh);
bf08867f 2472 p->proto = c->data.proto;
26b15dad 2473
9825069d 2474 nlmsg_end(skb, nlh);
26b15dad 2475
21ee543e 2476 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
26b15dad
JHS		 2477}
2478
7deb2264 2479static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2480{
7deb2264 2481 size_t l = 0;
1a6509d9
HX		 2482 if (x->aead)
2483 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2484 if (x->aalg) {
2485 l += nla_total_size(sizeof(struct xfrm_algo) +
2486 (x->aalg->alg_key_len + 7) / 8);
2487 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2488 }
26b15dad 2489 if (x->ealg)
0f99be0d 2490 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2491 if (x->calg)
7deb2264 2492 l += nla_total_size(sizeof(*x->calg));
26b15dad 2493 if (x->encap)
7deb2264 2494 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2495 if (x->tfcpad)
2496 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2497 if (x->replay_esn)
2498 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
68325d3b
HX		 2499 if (x->security)
2500 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2501 x->security->ctx_len);
2502 if (x->coaddr)
2503 l += nla_total_size(sizeof(*x->coaddr));
a947b0a9
ND		 2504 if (x->props.extra_flags)
2505 l += nla_total_size(sizeof(x->props.extra_flags));
68325d3b 2506
d26f3984
HX		 2507 /* Must count x->lastused as it may become non-zero behind our back. */
2508 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2509
2510 return l;
2511}
2512
214e005b 2513static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2514{
fc34acd3 2515 struct net *net = xs_net(x);
26b15dad 2516 struct xfrm_usersa_info *p;
0603eac0 2517 struct xfrm_usersa_id *id;
26b15dad
JHS		 2518 struct nlmsghdr *nlh;
2519 struct sk_buff *skb;
26b15dad 2520 int len = xfrm_sa_len(x);
1d1e34dd 2521 int headlen, err;
0603eac0
HX		 2522
2523 headlen = sizeof(*p);
2524 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2525 len += nla_total_size(headlen);
0603eac0 2526 headlen = sizeof(*id);
6f26b61e 2527 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2528 }
7deb2264 2529 len += NLMSG_ALIGN(headlen);
26b15dad 2530
7deb2264 2531 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2532 if (skb == NULL)
2533 return -ENOMEM;
26b15dad 2534
15e47304 2535 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2536 err = -EMSGSIZE;
79b8b7f4 2537 if (nlh == NULL)
1d1e34dd 2538 goto out_free_skb;
26b15dad 2539
7b67c857 2540 p = nlmsg_data(nlh);
0603eac0 2541 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2542 struct nlattr *attr;
2543
7b67c857 2544 id = nlmsg_data(nlh);
0603eac0
HX		 2545 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2546 id->spi = x->id.spi;
2547 id->family = x->props.family;
2548 id->proto = x->id.proto;
2549
c0144bea 2550 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2551 err = -EMSGSIZE;
c0144bea 2552 if (attr == NULL)
1d1e34dd 2553 goto out_free_skb;
c0144bea
TG		 2554
2555 p = nla_data(attr);
0603eac0 2556 }
1d1e34dd
DM		 2557 err = copy_to_user_state_extra(x, p, skb);
2558 if (err)
2559 goto out_free_skb;
26b15dad 2560
9825069d 2561 nlmsg_end(skb, nlh);
26b15dad 2562
21ee543e 2563 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
26b15dad 2564
1d1e34dd 2565out_free_skb:
26b15dad 2566 kfree_skb(skb);
1d1e34dd 2567 return err;
26b15dad
JHS		 2568}
2569
214e005b 2570static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2571{
2572
2573 switch (c->event) {
f60f6b8f 2574 case XFRM_MSG_EXPIRE:
26b15dad 2575 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2576 case XFRM_MSG_NEWAE:
2577 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2578 case XFRM_MSG_DELSA:
2579 case XFRM_MSG_UPDSA:
2580 case XFRM_MSG_NEWSA:
26b15dad 2581 return xfrm_notify_sa(x, c);
f60f6b8f 2582 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2583 return xfrm_notify_sa_flush(c);
2584 default:
62db5cfd 2585 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2586 c->event);
2587 break;
26b15dad
JHS		 2588 }
2589
2590 return 0;
2591
2592}
2593
7deb2264
TG		 2594static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2595 struct xfrm_policy *xp)
2596{
2597 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2598 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2599 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2600 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2601 + userpolicy_type_attrsize();
2602}
2603
1da177e4 2604static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
65e0736b 2605 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
1da177e4 2606{
1d1e34dd 2607 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2608 struct xfrm_user_acquire *ua;
2609 struct nlmsghdr *nlh;
1d1e34dd 2610 int err;
1da177e4 2611
79b8b7f4
TG		 2612 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2613 if (nlh == NULL)
2614 return -EMSGSIZE;
1da177e4 2615
7b67c857 2616 ua = nlmsg_data(nlh);
1da177e4
LT		 2617 memcpy(&ua->id, &x->id, sizeof(ua->id));
2618 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2619 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
65e0736b 2620 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
1da177e4
LT		 2621 ua->aalgos = xt->aalgos;
2622 ua->ealgos = xt->ealgos;
2623 ua->calgos = xt->calgos;
2624 ua->seq = x->km.seq = seq;
2625
1d1e34dd
DM		 2626 err = copy_to_user_tmpl(xp, skb);
2627 if (!err)
2628 err = copy_to_user_state_sec_ctx(x, skb);
2629 if (!err)
2630 err = copy_to_user_policy_type(xp->type, skb);
2631 if (!err)
2632 err = xfrm_mark_put(skb, &xp->mark);
2633 if (err) {
2634 nlmsg_cancel(skb, nlh);
2635 return err;
2636 }
1da177e4 2637
9825069d 2638 return nlmsg_end(skb, nlh);
1da177e4
LT		 2639}
2640
2641static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
65e0736b 2642 struct xfrm_policy *xp)
1da177e4 2643{
a6483b79 2644 struct net *net = xs_net(x);
1da177e4 2645 struct sk_buff *skb;
1da177e4 2646
7deb2264 2647 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2648 if (skb == NULL)
2649 return -ENOMEM;
2650
65e0736b 2651 if (build_acquire(skb, x, xt, xp) < 0)
1da177e4
LT		 2652 BUG();
2653
21ee543e 2654 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
1da177e4
LT		 2655}
2656
2657/* User gives us xfrm_user_policy_info followed by an array of 0
2658 * or more templates.
2659 */
cb969f07 2660static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2661 u8 *data, int len, int *dir)
2662{
fc34acd3 2663 struct net *net = sock_net(sk);
1da177e4
LT		 2664 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2665 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2666 struct xfrm_policy *xp;
2667 int nr;
2668
cb969f07 2669 switch (sk->sk_family) {
1da177e4
LT		 2670 case AF_INET:
2671 if (opt != IP_XFRM_POLICY) {
2672 *dir = -EOPNOTSUPP;
2673 return NULL;
2674 }
2675 break;
dfd56b8b 2676#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2677 case AF_INET6:
2678 if (opt != IPV6_XFRM_POLICY) {
2679 *dir = -EOPNOTSUPP;
2680 return NULL;
2681 }
2682 break;
2683#endif
2684 default:
2685 *dir = -EINVAL;
2686 return NULL;
2687 }
2688
2689 *dir = -EINVAL;
2690
2691 if (len < sizeof(*p) ||
2692 verify_newpolicy_info(p))
2693 return NULL;
2694
2695 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2696 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2697 return NULL;
2698
a4f1bac6
HX		 2699 if (p->dir > XFRM_POLICY_OUT)
2700 return NULL;
2701
2f09a4d5 2702 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2703 if (xp == NULL) {
2704 *dir = -ENOBUFS;
2705 return NULL;
2706 }
2707
2708 copy_from_user_policy(xp, p);
f7b6983f 2709 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2710 copy_templates(xp, ut, nr);
2711
2712 *dir = p->dir;
2713
2714 return xp;
2715}
2716
7deb2264
TG		 2717static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2718{
2719 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2720 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2721 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2722 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2723 + userpolicy_type_attrsize();
2724}
2725
1da177e4 2726static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2727 int dir, const struct km_event *c)
1da177e4
LT		 2728{
2729 struct xfrm_user_polexpire *upe;
d51d081d 2730 int hard = c->data.hard;
1d1e34dd
DM		 2731 struct nlmsghdr *nlh;
2732 int err;
1da177e4 2733
15e47304 2734 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
79b8b7f4
TG		 2735 if (nlh == NULL)
2736 return -EMSGSIZE;
1da177e4 2737
7b67c857 2738 upe = nlmsg_data(nlh);
1da177e4 2739 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2740 err = copy_to_user_tmpl(xp, skb);
2741 if (!err)
2742 err = copy_to_user_sec_ctx(xp, skb);
2743 if (!err)
2744 err = copy_to_user_policy_type(xp->type, skb);
2745 if (!err)
2746 err = xfrm_mark_put(skb, &xp->mark);
2747 if (err) {
2748 nlmsg_cancel(skb, nlh);
2749 return err;
2750 }
1da177e4
LT		 2751 upe->hard = !!hard;
2752
9825069d 2753 return nlmsg_end(skb, nlh);
1da177e4
LT		 2754}
2755
214e005b 2756static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2757{
fc34acd3 2758 struct net *net = xp_net(xp);
1da177e4 2759 struct sk_buff *skb;
1da177e4 2760
7deb2264 2761 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2762 if (skb == NULL)
2763 return -ENOMEM;
2764
d51d081d 2765 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2766 BUG();
2767
21ee543e 2768 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
1da177e4
LT		 2769}
2770
214e005b 2771static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2772{
1d1e34dd 2773 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2774 struct net *net = xp_net(xp);
26b15dad 2775 struct xfrm_userpolicy_info *p;
0603eac0 2776 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2777 struct nlmsghdr *nlh;
2778 struct sk_buff *skb;
1d1e34dd 2779 int headlen, err;
0603eac0
HX		 2780
2781 headlen = sizeof(*p);
2782 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2783 len += nla_total_size(headlen);
0603eac0
HX		 2784 headlen = sizeof(*id);
2785 }
cfbfd45a 2786 len += userpolicy_type_attrsize();
295fae56 2787 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2788 len += NLMSG_ALIGN(headlen);
26b15dad 2789
7deb2264 2790 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2791 if (skb == NULL)
2792 return -ENOMEM;
26b15dad 2793
15e47304 2794 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
1d1e34dd 2795 err = -EMSGSIZE;
79b8b7f4 2796 if (nlh == NULL)
1d1e34dd 2797 goto out_free_skb;
26b15dad 2798
7b67c857 2799 p = nlmsg_data(nlh);
0603eac0 2800 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2801 struct nlattr *attr;
2802
7b67c857 2803 id = nlmsg_data(nlh);
0603eac0
HX		 2804 memset(id, 0, sizeof(*id));
2805 id->dir = dir;
2806 if (c->data.byid)
2807 id->index = xp->index;
2808 else
2809 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2810
c0144bea 2811 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2812 err = -EMSGSIZE;
c0144bea 2813 if (attr == NULL)
1d1e34dd 2814 goto out_free_skb;
c0144bea
TG		 2815
2816 p = nla_data(attr);
0603eac0 2817 }
26b15dad 2818
26b15dad 2819 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2820 err = copy_to_user_tmpl(xp, skb);
2821 if (!err)
2822 err = copy_to_user_policy_type(xp->type, skb);
2823 if (!err)
2824 err = xfrm_mark_put(skb, &xp->mark);
2825 if (err)
2826 goto out_free_skb;
295fae56 2827
9825069d 2828 nlmsg_end(skb, nlh);
26b15dad 2829
21ee543e 2830 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
26b15dad 2831
1d1e34dd 2832out_free_skb:
26b15dad 2833 kfree_skb(skb);
1d1e34dd 2834 return err;
26b15dad
JHS		 2835}
2836
214e005b 2837static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2838{
7067802e 2839 struct net *net = c->net;
26b15dad
JHS		 2840 struct nlmsghdr *nlh;
2841 struct sk_buff *skb;
1d1e34dd 2842 int err;
26b15dad 2843
7deb2264 2844 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2845 if (skb == NULL)
2846 return -ENOMEM;
26b15dad 2847
15e47304 2848 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2849 err = -EMSGSIZE;
79b8b7f4 2850 if (nlh == NULL)
1d1e34dd
DM		 2851 goto out_free_skb;
2852 err = copy_to_user_policy_type(c->data.type, skb);
2853 if (err)
2854 goto out_free_skb;
26b15dad 2855
9825069d 2856 nlmsg_end(skb, nlh);
26b15dad 2857
21ee543e 2858 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
26b15dad 2859
1d1e34dd 2860out_free_skb:
26b15dad 2861 kfree_skb(skb);
1d1e34dd 2862 return err;
26b15dad
JHS		 2863}
2864
214e005b 2865static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2866{
2867
2868 switch (c->event) {
f60f6b8f
HX		 2869 case XFRM_MSG_NEWPOLICY:
2870 case XFRM_MSG_UPDPOLICY:
2871 case XFRM_MSG_DELPOLICY:
26b15dad 2872 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2873 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2874 return xfrm_notify_policy_flush(c);
f60f6b8f 2875 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2876 return xfrm_exp_policy_notify(xp, dir, c);
2877 default:
62db5cfd 2878 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2879 c->event);
26b15dad
JHS		 2880 }
2881
2882 return 0;
2883
2884}
2885
7deb2264
TG		 2886static inline size_t xfrm_report_msgsize(void)
2887{
2888 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2889}
2890
97a64b45
MN		 2891static int build_report(struct sk_buff *skb, u8 proto,
2892 struct xfrm_selector *sel, xfrm_address_t *addr)
2893{
2894 struct xfrm_user_report *ur;
2895 struct nlmsghdr *nlh;
97a64b45 2896
79b8b7f4
TG		 2897 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2898 if (nlh == NULL)
2899 return -EMSGSIZE;
97a64b45 2900
7b67c857 2901 ur = nlmsg_data(nlh);
97a64b45
MN		 2902 ur->proto = proto;
2903 memcpy(&ur->sel, sel, sizeof(ur->sel));
2904
1d1e34dd
DM		 2905 if (addr) {
2906 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2907 if (err) {
2908 nlmsg_cancel(skb, nlh);
2909 return err;
2910 }
2911 }
9825069d 2912 return nlmsg_end(skb, nlh);
97a64b45
MN		 2913}
2914
db983c11
AD		 2915static int xfrm_send_report(struct net *net, u8 proto,
2916 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2917{
2918 struct sk_buff *skb;
97a64b45 2919
7deb2264 2920 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2921 if (skb == NULL)
2922 return -ENOMEM;
2923
2924 if (build_report(skb, proto, sel, addr) < 0)
2925 BUG();
2926
21ee543e 2927 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
97a64b45
MN		 2928}
2929
3a2dfbe8
MW		 2930static inline size_t xfrm_mapping_msgsize(void)
2931{
2932 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2933}
2934
2935static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2936 xfrm_address_t *new_saddr, __be16 new_sport)
2937{
2938 struct xfrm_user_mapping *um;
2939 struct nlmsghdr *nlh;
2940
2941 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2942 if (nlh == NULL)
2943 return -EMSGSIZE;
2944
2945 um = nlmsg_data(nlh);
2946
2947 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2948 um->id.spi = x->id.spi;
2949 um->id.family = x->props.family;
2950 um->id.proto = x->id.proto;
2951 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2952 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2953 um->new_sport = new_sport;
2954 um->old_sport = x->encap->encap_sport;
2955 um->reqid = x->props.reqid;
2956
2957 return nlmsg_end(skb, nlh);
2958}
2959
2960static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2961 __be16 sport)
2962{
a6483b79 2963 struct net *net = xs_net(x);
3a2dfbe8
MW		 2964 struct sk_buff *skb;
2965
2966 if (x->id.proto != IPPROTO_ESP)
2967 return -EINVAL;
2968
2969 if (!x->encap)
2970 return -EINVAL;
2971
2972 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2973 if (skb == NULL)
2974 return -ENOMEM;
2975
2976 if (build_mapping(skb, x, ipaddr, sport) < 0)
2977 BUG();
2978
21ee543e 2979 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3a2dfbe8
MW		 2980}
2981
0f24558e
HG		 2982static bool xfrm_is_alive(const struct km_event *c)
2983{
2984 return (bool)xfrm_acquire_is_on(c->net);
2985}
2986
1da177e4
LT		 2987static struct xfrm_mgr netlink_mgr = {
2988 .id = "netlink",
2989 .notify = xfrm_send_state_notify,
2990 .acquire = xfrm_send_acquire,
2991 .compile_policy = xfrm_compile_policy,
2992 .notify_policy = xfrm_send_policy_notify,
97a64b45 2993 .report = xfrm_send_report,
5c79de6e 2994 .migrate = xfrm_send_migrate,
3a2dfbe8 2995 .new_mapping = xfrm_send_mapping,
0f24558e 2996 .is_alive = xfrm_is_alive,
1da177e4
LT		 2997};
2998
a6483b79 2999static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 3000{
be33690d 3001 struct sock *nlsk;
a31f2d17
PNA		 3002 struct netlink_kernel_cfg cfg = {
3003 .groups = XFRMNLGRP_MAX,
3004 .input = xfrm_netlink_rcv,
3005 };
be33690d 3006
9f00d977 3007 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
be33690d 3008 if (nlsk == NULL)
1da177e4 3009 return -ENOMEM;
d79d792e 3010 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 3011 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 3012 return 0;
3013}
3014
d79d792e 3015static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 3016{
d79d792e
EB		 3017 struct net *net;
3018 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 3019 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 3020 synchronize_net();
3021 list_for_each_entry(net, net_exit_list, exit_list)
3022 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 3023}
3024
a6483b79 3025static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 3026 .init = xfrm_user_net_init,
3027 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 3028};
3029
3030static int __init xfrm_user_init(void)
3031{
3032 int rv;
3033
3034 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3035
3036 rv = register_pernet_subsys(&xfrm_user_net_ops);
3037 if (rv < 0)
3038 return rv;
3039 rv = xfrm_register_km(&netlink_mgr);
3040 if (rv < 0)
3041 unregister_pernet_subsys(&xfrm_user_net_ops);
3042 return rv;
3043}
3044
3045static void __exit xfrm_user_exit(void)
3046{
3047 xfrm_unregister_km(&netlink_mgr);
3048 unregister_pernet_subsys(&xfrm_user_net_ops);
3049}
3050
1da177e4
LT		 3051module_init(xfrm_user_init);
3052module_exit(xfrm_user_exit);
3053MODULE_LICENSE("GPL");
4fdb3bb7 3054MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3055
Linux kernel - Deliverables
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