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xfrm_user: fix info leak in copy_to_user_tmpl()
[mirror_ubuntu-zesty-kernel.git] / net / xfrm / xfrm_user.c
CommitLineData
1da177e4
LT		 1/* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
df71837d 10 *
1da177e4
LT		 11 */
12
9409f38a 13#include <linux/crypto.h>
1da177e4
LT		 14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/socket.h>
19#include <linux/string.h>
20#include <linux/net.h>
21#include <linux/skbuff.h>
1da177e4
LT		 22#include <linux/pfkeyv2.h>
23#include <linux/ipsec.h>
24#include <linux/init.h>
25#include <linux/security.h>
26#include <net/sock.h>
27#include <net/xfrm.h>
88fc2c84 28#include <net/netlink.h>
fa6dd8a2 29#include <net/ah.h>
1da177e4 30#include <asm/uaccess.h>
dfd56b8b 31#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 32#include <linux/in6.h>
33#endif
1da177e4 34
1a6509d9
HX		 35static inline int aead_len(struct xfrm_algo_aead *alg)
36{
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38}
39
5424f32e 40static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
1da177e4 41{
5424f32e 42 struct nlattr *rt = attrs[type];
1da177e4
LT		 43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
5424f32e 48 algp = nla_data(rt);
0f99be0d 49 if (nla_len(rt) < xfrm_alg_len(algp))
31c26852
HX		 50 return -EINVAL;
51
1da177e4
LT		 52 switch (type) {
53 case XFRMA_ALG_AUTH:
1da177e4 54 case XFRMA_ALG_CRYPT:
1da177e4 55 case XFRMA_ALG_COMP:
1da177e4
LT		 56 break;
57
58 default:
59 return -EINVAL;
3ff50b79 60 }
1da177e4
LT		 61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64}
65
4447bb33
MW		 66static int verify_auth_trunc(struct nlattr **attrs)
67{
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80}
81
1a6509d9
HX		 82static int verify_aead(struct nlattr **attrs)
83{
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96}
97
5424f32e 98static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
eb2971b6
MN		 99 xfrm_address_t **addrp)
100{
5424f32e 101 struct nlattr *rt = attrs[type];
eb2971b6 102
cf5cb79f 103 if (rt && addrp)
5424f32e 104 *addrp = nla_data(rt);
eb2971b6 105}
df71837d 106
5424f32e 107static inline int verify_sec_ctx_len(struct nlattr **attrs)
df71837d 108{
5424f32e 109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d 110 struct xfrm_user_sec_ctx *uctx;
df71837d
TJ		 111
112 if (!rt)
113 return 0;
114
5424f32e 115 uctx = nla_data(rt);
cf5cb79f 116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
df71837d
TJ		 117 return -EINVAL;
118
119 return 0;
120}
121
d8647b79
SK		 122static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124{
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126
7833aa05
SK		 127 if ((p->flags & XFRM_STATE_ESN) && !rt)
128 return -EINVAL;
129
d8647b79
SK		 130 if (!rt)
131 return 0;
132
02aadf72
SK		 133 if (p->id.proto != IPPROTO_ESP)
134 return -EINVAL;
135
d8647b79
SK		 136 if (p->replay_window != 0)
137 return -EINVAL;
138
139 return 0;
140}
df71837d 141
1da177e4 142static int verify_newsa_info(struct xfrm_usersa_info *p,
5424f32e 143 struct nlattr **attrs)
1da177e4
LT		 144{
145 int err;
146
147 err = -EINVAL;
148 switch (p->family) {
149 case AF_INET:
150 break;
151
152 case AF_INET6:
dfd56b8b 153#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 154 break;
155#else
156 err = -EAFNOSUPPORT;
157 goto out;
158#endif
159
160 default:
161 goto out;
3ff50b79 162 }
1da177e4
LT		 163
164 err = -EINVAL;
165 switch (p->id.proto) {
166 case IPPROTO_AH:
4447bb33
MW		 167 if ((!attrs[XFRMA_ALG_AUTH] &&
168 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
1a6509d9 169 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 170 attrs[XFRMA_ALG_CRYPT] ||
35d2856b
MW		 171 attrs[XFRMA_ALG_COMP] ||
172 attrs[XFRMA_TFCPAD])
1da177e4
LT		 173 goto out;
174 break;
175
176 case IPPROTO_ESP:
1a6509d9
HX		 177 if (attrs[XFRMA_ALG_COMP])
178 goto out;
179 if (!attrs[XFRMA_ALG_AUTH] &&
4447bb33 180 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
1a6509d9
HX		 181 !attrs[XFRMA_ALG_CRYPT] &&
182 !attrs[XFRMA_ALG_AEAD])
183 goto out;
184 if ((attrs[XFRMA_ALG_AUTH] ||
4447bb33 185 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9
HX		 186 attrs[XFRMA_ALG_CRYPT]) &&
187 attrs[XFRMA_ALG_AEAD])
1da177e4 188 goto out;
35d2856b
MW		 189 if (attrs[XFRMA_TFCPAD] &&
190 p->mode != XFRM_MODE_TUNNEL)
191 goto out;
1da177e4
LT		 192 break;
193
194 case IPPROTO_COMP:
35a7aa08 195 if (!attrs[XFRMA_ALG_COMP] ||
1a6509d9 196 attrs[XFRMA_ALG_AEAD] ||
35a7aa08 197 attrs[XFRMA_ALG_AUTH] ||
4447bb33 198 attrs[XFRMA_ALG_AUTH_TRUNC] ||
35d2856b
MW		 199 attrs[XFRMA_ALG_CRYPT] ||
200 attrs[XFRMA_TFCPAD])
1da177e4
LT		 201 goto out;
202 break;
203
dfd56b8b 204#if IS_ENABLED(CONFIG_IPV6)
e23c7194
MN		 205 case IPPROTO_DSTOPTS:
206 case IPPROTO_ROUTING:
35a7aa08
TG		 207 if (attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AUTH] ||
4447bb33 209 attrs[XFRMA_ALG_AUTH_TRUNC] ||
1a6509d9 210 attrs[XFRMA_ALG_AEAD] ||
35a7aa08
TG		 211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_ENCAP] ||
213 attrs[XFRMA_SEC_CTX] ||
35d2856b 214 attrs[XFRMA_TFCPAD] ||
35a7aa08 215 !attrs[XFRMA_COADDR])
e23c7194
MN		 216 goto out;
217 break;
218#endif
219
1da177e4
LT		 220 default:
221 goto out;
3ff50b79 222 }
1da177e4 223
1a6509d9
HX		 224 if ((err = verify_aead(attrs)))
225 goto out;
4447bb33
MW		 226 if ((err = verify_auth_trunc(attrs)))
227 goto out;
35a7aa08 228 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
1da177e4 229 goto out;
35a7aa08 230 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
1da177e4 231 goto out;
35a7aa08 232 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
1da177e4 233 goto out;
35a7aa08 234 if ((err = verify_sec_ctx_len(attrs)))
df71837d 235 goto out;
d8647b79
SK		 236 if ((err = verify_replay(p, attrs)))
237 goto out;
1da177e4
LT		 238
239 err = -EINVAL;
240 switch (p->mode) {
7e49e6de
MN		 241 case XFRM_MODE_TRANSPORT:
242 case XFRM_MODE_TUNNEL:
060f02a3 243 case XFRM_MODE_ROUTEOPTIMIZATION:
0a69452c 244 case XFRM_MODE_BEET:
1da177e4
LT		 245 break;
246
247 default:
248 goto out;
3ff50b79 249 }
1da177e4
LT		 250
251 err = 0;
252
253out:
254 return err;
255}
256
257static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
6f2f19ed 258 struct xfrm_algo_desc *(*get_byname)(const char *, int),
5424f32e 259 struct nlattr *rta)
1da177e4 260{
1da177e4
LT		 261 struct xfrm_algo *p, *ualg;
262 struct xfrm_algo_desc *algo;
263
264 if (!rta)
265 return 0;
266
5424f32e 267 ualg = nla_data(rta);
1da177e4
LT		 268
269 algo = get_byname(ualg->alg_name, 1);
270 if (!algo)
271 return -ENOSYS;
272 *props = algo->desc.sadb_alg_id;
273
0f99be0d 274 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
1da177e4
LT		 275 if (!p)
276 return -ENOMEM;
277
04ff1260 278 strcpy(p->alg_name, algo->name);
1da177e4
LT		 279 *algpp = p;
280 return 0;
281}
282
4447bb33
MW		 283static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
284 struct nlattr *rta)
285{
286 struct xfrm_algo *ualg;
287 struct xfrm_algo_auth *p;
288 struct xfrm_algo_desc *algo;
289
290 if (!rta)
291 return 0;
292
293 ualg = nla_data(rta);
294
295 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
296 if (!algo)
297 return -ENOSYS;
298 *props = algo->desc.sadb_alg_id;
299
300 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
301 if (!p)
302 return -ENOMEM;
303
304 strcpy(p->alg_name, algo->name);
305 p->alg_key_len = ualg->alg_key_len;
306 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
307 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
308
309 *algpp = p;
310 return 0;
311}
312
313static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315{
316 struct xfrm_algo_auth *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
fa6dd8a2
ND		 327 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
328 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
4447bb33
MW		 329 return -EINVAL;
330 *props = algo->desc.sadb_alg_id;
331
332 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
333 if (!p)
334 return -ENOMEM;
335
336 strcpy(p->alg_name, algo->name);
337 if (!p->alg_trunc_len)
338 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
339
340 *algpp = p;
341 return 0;
342}
343
1a6509d9
HX		 344static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
345 struct nlattr *rta)
346{
347 struct xfrm_algo_aead *p, *ualg;
348 struct xfrm_algo_desc *algo;
349
350 if (!rta)
351 return 0;
352
353 ualg = nla_data(rta);
354
355 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
356 if (!algo)
357 return -ENOSYS;
358 *props = algo->desc.sadb_alg_id;
359
360 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
361 if (!p)
362 return -ENOMEM;
363
364 strcpy(p->alg_name, algo->name);
365 *algpp = p;
366 return 0;
367}
368
e2b19125
SK		 369static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
370 struct nlattr *rp)
371{
372 struct xfrm_replay_state_esn *up;
373
374 if (!replay_esn || !rp)
375 return 0;
376
377 up = nla_data(rp);
378
379 if (xfrm_replay_state_esn_len(replay_esn) !=
380 xfrm_replay_state_esn_len(up))
381 return -EINVAL;
382
383 return 0;
384}
385
d8647b79
SK		 386static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
387 struct xfrm_replay_state_esn **preplay_esn,
388 struct nlattr *rta)
389{
390 struct xfrm_replay_state_esn *p, *pp, *up;
391
392 if (!rta)
393 return 0;
394
395 up = nla_data(rta);
396
397 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
398 if (!p)
399 return -ENOMEM;
400
401 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
402 if (!pp) {
403 kfree(p);
404 return -ENOMEM;
405 }
406
407 *replay_esn = p;
408 *preplay_esn = pp;
409
410 return 0;
411}
412
661697f7 413static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
df71837d 414{
df71837d
TJ		 415 int len = 0;
416
417 if (xfrm_ctx) {
418 len += sizeof(struct xfrm_user_sec_ctx);
419 len += xfrm_ctx->ctx_len;
420 }
421 return len;
422}
423
1da177e4
LT		 424static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
425{
426 memcpy(&x->id, &p->id, sizeof(x->id));
427 memcpy(&x->sel, &p->sel, sizeof(x->sel));
428 memcpy(&x->lft, &p->lft, sizeof(x->lft));
429 x->props.mode = p->mode;
430 x->props.replay_window = p->replay_window;
431 x->props.reqid = p->reqid;
432 x->props.family = p->family;
54489c14 433 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
1da177e4 434 x->props.flags = p->flags;
196b0036 435
ccf9b3b8 436 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
196b0036 437 x->sel.family = p->family;
1da177e4
LT		 438}
439
d51d081d
JHS		 440/*
441 * someday when pfkey also has support, we could have the code
442 * somehow made shareable and move it to xfrm_state.c - JHS
443 *
444*/
5424f32e 445static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
d51d081d 446{
5424f32e 447 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 448 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e
TG		 449 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
450 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
451 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
d51d081d 452
d8647b79
SK		 453 if (re) {
454 struct xfrm_replay_state_esn *replay_esn;
455 replay_esn = nla_data(re);
456 memcpy(x->replay_esn, replay_esn,
457 xfrm_replay_state_esn_len(replay_esn));
458 memcpy(x->preplay_esn, replay_esn,
459 xfrm_replay_state_esn_len(replay_esn));
460 }
461
d51d081d
JHS		 462 if (rp) {
463 struct xfrm_replay_state *replay;
5424f32e 464 replay = nla_data(rp);
d51d081d
JHS		 465 memcpy(&x->replay, replay, sizeof(*replay));
466 memcpy(&x->preplay, replay, sizeof(*replay));
467 }
468
469 if (lt) {
470 struct xfrm_lifetime_cur *ltime;
5424f32e 471 ltime = nla_data(lt);
d51d081d
JHS		 472 x->curlft.bytes = ltime->bytes;
473 x->curlft.packets = ltime->packets;
474 x->curlft.add_time = ltime->add_time;
475 x->curlft.use_time = ltime->use_time;
476 }
477
cf5cb79f 478 if (et)
5424f32e 479 x->replay_maxage = nla_get_u32(et);
d51d081d 480
cf5cb79f 481 if (rt)
5424f32e 482 x->replay_maxdiff = nla_get_u32(rt);
d51d081d
JHS		 483}
484
fc34acd3
AD		 485static struct xfrm_state *xfrm_state_construct(struct net *net,
486 struct xfrm_usersa_info *p,
5424f32e 487 struct nlattr **attrs,
1da177e4
LT		 488 int *errp)
489{
fc34acd3 490 struct xfrm_state *x = xfrm_state_alloc(net);
1da177e4
LT		 491 int err = -ENOMEM;
492
493 if (!x)
494 goto error_no_put;
495
496 copy_from_user_state(x, p);
497
1a6509d9
HX		 498 if ((err = attach_aead(&x->aead, &x->props.ealgo,
499 attrs[XFRMA_ALG_AEAD])))
500 goto error;
4447bb33
MW		 501 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
502 attrs[XFRMA_ALG_AUTH_TRUNC])))
1da177e4 503 goto error;
4447bb33
MW		 504 if (!x->props.aalgo) {
505 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
506 attrs[XFRMA_ALG_AUTH])))
507 goto error;
508 }
1da177e4
LT		 509 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
510 xfrm_ealg_get_byname,
35a7aa08 511 attrs[XFRMA_ALG_CRYPT])))
1da177e4
LT		 512 goto error;
513 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
514 xfrm_calg_get_byname,
35a7aa08 515 attrs[XFRMA_ALG_COMP])))
1da177e4 516 goto error;
fd21150a
TG		 517
518 if (attrs[XFRMA_ENCAP]) {
519 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
520 sizeof(*x->encap), GFP_KERNEL);
521 if (x->encap == NULL)
522 goto error;
523 }
524
35d2856b
MW		 525 if (attrs[XFRMA_TFCPAD])
526 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
527
fd21150a
TG		 528 if (attrs[XFRMA_COADDR]) {
529 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
530 sizeof(*x->coaddr), GFP_KERNEL);
531 if (x->coaddr == NULL)
532 goto error;
533 }
534
6f26b61e
JHS		 535 xfrm_mark_get(attrs, &x->mark);
536
a454f0cc 537 err = __xfrm_init_state(x, false);
1da177e4
LT		 538 if (err)
539 goto error;
540
fd21150a
TG		 541 if (attrs[XFRMA_SEC_CTX] &&
542 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
df71837d
TJ		 543 goto error;
544
d8647b79
SK		 545 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
546 attrs[XFRMA_REPLAY_ESN_VAL])))
547 goto error;
548
1da177e4 549 x->km.seq = p->seq;
b27aeadb 550 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
d51d081d 551 /* sysctl_xfrm_aevent_etime is in 100ms units */
b27aeadb 552 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
d51d081d 553
9fdc4883
SK		 554 if ((err = xfrm_init_replay(x)))
555 goto error;
d51d081d 556
9fdc4883 557 /* override default values from above */
5424f32e 558 xfrm_update_ae_params(x, attrs);
1da177e4
LT		 559
560 return x;
561
562error:
563 x->km.state = XFRM_STATE_DEAD;
564 xfrm_state_put(x);
565error_no_put:
566 *errp = err;
567 return NULL;
568}
569
22e70050 570static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 571 struct nlattr **attrs)
1da177e4 572{
fc34acd3 573 struct net *net = sock_net(skb->sk);
7b67c857 574 struct xfrm_usersa_info *p = nlmsg_data(nlh);
1da177e4
LT		 575 struct xfrm_state *x;
576 int err;
26b15dad 577 struct km_event c;
c53fa1ed
PM		 578 uid_t loginuid = audit_get_loginuid(current);
579 u32 sessionid = audit_get_sessionid(current);
580 u32 sid;
1da177e4 581
35a7aa08 582 err = verify_newsa_info(p, attrs);
1da177e4
LT		 583 if (err)
584 return err;
585
fc34acd3 586 x = xfrm_state_construct(net, p, attrs, &err);
1da177e4
LT		 587 if (!x)
588 return err;
589
26b15dad 590 xfrm_state_hold(x);
1da177e4
LT		 591 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
592 err = xfrm_state_add(x);
593 else
594 err = xfrm_state_update(x);
595
c53fa1ed 596 security_task_getsecid(current, &sid);
2532386f 597 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 598
1da177e4
LT		 599 if (err < 0) {
600 x->km.state = XFRM_STATE_DEAD;
21380b81 601 __xfrm_state_put(x);
7d6dfe1f 602 goto out;
1da177e4
LT		 603 }
604
26b15dad
JHS		 605 c.seq = nlh->nlmsg_seq;
606 c.pid = nlh->nlmsg_pid;
f60f6b8f 607 c.event = nlh->nlmsg_type;
26b15dad
JHS		 608
609 km_state_notify(x, &c);
7d6dfe1f 610out:
26b15dad 611 xfrm_state_put(x);
1da177e4
LT		 612 return err;
613}
614
fc34acd3
AD		 615static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
616 struct xfrm_usersa_id *p,
5424f32e 617 struct nlattr **attrs,
eb2971b6
MN		 618 int *errp)
619{
620 struct xfrm_state *x = NULL;
6f26b61e 621 struct xfrm_mark m;
eb2971b6 622 int err;
6f26b61e 623 u32 mark = xfrm_mark_get(attrs, &m);
eb2971b6
MN		 624
625 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
626 err = -ESRCH;
6f26b61e 627 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
eb2971b6
MN		 628 } else {
629 xfrm_address_t *saddr = NULL;
630
35a7aa08 631 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
eb2971b6
MN		 632 if (!saddr) {
633 err = -EINVAL;
634 goto out;
635 }
636
9abbffee 637 err = -ESRCH;
6f26b61e
JHS		 638 x = xfrm_state_lookup_byaddr(net, mark,
639 &p->daddr, saddr,
221df1ed 640 p->proto, p->family);
eb2971b6
MN		 641 }
642
643 out:
644 if (!x && errp)
645 *errp = err;
646 return x;
647}
648
22e70050 649static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 650 struct nlattr **attrs)
1da177e4 651{
fc34acd3 652 struct net *net = sock_net(skb->sk);
1da177e4 653 struct xfrm_state *x;
eb2971b6 654 int err = -ESRCH;
26b15dad 655 struct km_event c;
7b67c857 656 struct xfrm_usersa_id *p = nlmsg_data(nlh);
c53fa1ed
PM		 657 uid_t loginuid = audit_get_loginuid(current);
658 u32 sessionid = audit_get_sessionid(current);
659 u32 sid;
1da177e4 660
fc34acd3 661 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4 662 if (x == NULL)
eb2971b6 663 return err;
1da177e4 664
6f68dc37 665 if ((err = security_xfrm_state_delete(x)) != 0)
c8c05a8e
CZ		 666 goto out;
667
1da177e4 668 if (xfrm_state_kern(x)) {
c8c05a8e
CZ		 669 err = -EPERM;
670 goto out;
1da177e4
LT		 671 }
672
26b15dad 673 err = xfrm_state_delete(x);
161a09e7 674
c8c05a8e
CZ		 675 if (err < 0)
676 goto out;
26b15dad
JHS		 677
678 c.seq = nlh->nlmsg_seq;
679 c.pid = nlh->nlmsg_pid;
f60f6b8f 680 c.event = nlh->nlmsg_type;
26b15dad 681 km_state_notify(x, &c);
1da177e4 682
c8c05a8e 683out:
c53fa1ed 684 security_task_getsecid(current, &sid);
2532386f 685 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
c8c05a8e 686 xfrm_state_put(x);
26b15dad 687 return err;
1da177e4
LT		 688}
689
690static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
691{
f778a636 692 memset(p, 0, sizeof(*p));
1da177e4
LT		 693 memcpy(&p->id, &x->id, sizeof(p->id));
694 memcpy(&p->sel, &x->sel, sizeof(p->sel));
695 memcpy(&p->lft, &x->lft, sizeof(p->lft));
696 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
697 memcpy(&p->stats, &x->stats, sizeof(p->stats));
54489c14 698 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
1da177e4
LT		 699 p->mode = x->props.mode;
700 p->replay_window = x->props.replay_window;
701 p->reqid = x->props.reqid;
702 p->family = x->props.family;
703 p->flags = x->props.flags;
704 p->seq = x->km.seq;
705}
706
707struct xfrm_dump_info {
708 struct sk_buff *in_skb;
709 struct sk_buff *out_skb;
710 u32 nlmsg_seq;
711 u16 nlmsg_flags;
1da177e4
LT		 712};
713
c0144bea
TG		 714static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
715{
c0144bea
TG		 716 struct xfrm_user_sec_ctx *uctx;
717 struct nlattr *attr;
68325d3b 718 int ctx_size = sizeof(*uctx) + s->ctx_len;
c0144bea
TG		 719
720 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
721 if (attr == NULL)
722 return -EMSGSIZE;
723
724 uctx = nla_data(attr);
725 uctx->exttype = XFRMA_SEC_CTX;
726 uctx->len = ctx_size;
727 uctx->ctx_doi = s->ctx_doi;
728 uctx->ctx_alg = s->ctx_alg;
729 uctx->ctx_len = s->ctx_len;
730 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
731
732 return 0;
733}
734
4447bb33
MW		 735static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
736{
737 struct xfrm_algo *algo;
738 struct nlattr *nla;
739
740 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
741 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
742 if (!nla)
743 return -EMSGSIZE;
744
745 algo = nla_data(nla);
4c87308b 746 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
4447bb33
MW		 747 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
748 algo->alg_key_len = auth->alg_key_len;
749
750 return 0;
751}
752
68325d3b
HX		 753/* Don't change this without updating xfrm_sa_len! */
754static int copy_to_user_state_extra(struct xfrm_state *x,
755 struct xfrm_usersa_info *p,
756 struct sk_buff *skb)
1da177e4 757{
1d1e34dd 758 int ret = 0;
d0fde795 759
1d1e34dd 760 copy_to_user_state(x, p);
68325d3b 761
1d1e34dd
DM		 762 if (x->coaddr) {
763 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
764 if (ret)
765 goto out;
766 }
767 if (x->lastused) {
768 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
769 if (ret)
770 goto out;
771 }
772 if (x->aead) {
773 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
774 if (ret)
775 goto out;
776 }
777 if (x->aalg) {
778 ret = copy_to_user_auth(x->aalg, skb);
779 if (!ret)
780 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
781 xfrm_alg_auth_len(x->aalg), x->aalg);
782 if (ret)
783 goto out;
784 }
785 if (x->ealg) {
786 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
787 if (ret)
788 goto out;
789 }
790 if (x->calg) {
791 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
792 if (ret)
793 goto out;
794 }
795 if (x->encap) {
796 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
797 if (ret)
798 goto out;
799 }
800 if (x->tfcpad) {
801 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
802 if (ret)
803 goto out;
804 }
805 ret = xfrm_mark_put(skb, &x->mark);
806 if (ret)
807 goto out;
808 if (x->replay_esn) {
809 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
810 xfrm_replay_state_esn_len(x->replay_esn),
811 x->replay_esn);
812 if (ret)
813 goto out;
814 }
815 if (x->security)
816 ret = copy_sec_ctx(x->security, skb);
817out:
818 return ret;
68325d3b
HX		 819}
820
821static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
822{
823 struct xfrm_dump_info *sp = ptr;
824 struct sk_buff *in_skb = sp->in_skb;
825 struct sk_buff *skb = sp->out_skb;
826 struct xfrm_usersa_info *p;
827 struct nlmsghdr *nlh;
828 int err;
829
68325d3b
HX		 830 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
831 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
832 if (nlh == NULL)
833 return -EMSGSIZE;
834
835 p = nlmsg_data(nlh);
836
837 err = copy_to_user_state_extra(x, p, skb);
1d1e34dd
DM		 838 if (err) {
839 nlmsg_cancel(skb, nlh);
840 return err;
841 }
9825069d 842 nlmsg_end(skb, nlh);
1da177e4 843 return 0;
1da177e4
LT		 844}
845
4c563f76
TT		 846static int xfrm_dump_sa_done(struct netlink_callback *cb)
847{
848 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
849 xfrm_state_walk_done(walk);
850 return 0;
851}
852
1da177e4
LT		 853static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
854{
fc34acd3 855 struct net *net = sock_net(skb->sk);
4c563f76 856 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1da177e4
LT		 857 struct xfrm_dump_info info;
858
4c563f76
TT		 859 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
860 sizeof(cb->args) - sizeof(cb->args[0]));
861
1da177e4
LT		 862 info.in_skb = cb->skb;
863 info.out_skb = skb;
864 info.nlmsg_seq = cb->nlh->nlmsg_seq;
865 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 866
867 if (!cb->args[0]) {
868 cb->args[0] = 1;
869 xfrm_state_walk_init(walk, 0);
870 }
871
fc34acd3 872 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1da177e4
LT		 873
874 return skb->len;
875}
876
877static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
878 struct xfrm_state *x, u32 seq)
879{
880 struct xfrm_dump_info info;
881 struct sk_buff *skb;
864745d2 882 int err;
1da177e4 883
7deb2264 884 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1da177e4
LT		 885 if (!skb)
886 return ERR_PTR(-ENOMEM);
887
1da177e4
LT		 888 info.in_skb = in_skb;
889 info.out_skb = skb;
890 info.nlmsg_seq = seq;
891 info.nlmsg_flags = 0;
1da177e4 892
864745d2
MK		 893 err = dump_one_state(x, 0, &info);
894 if (err) {
1da177e4 895 kfree_skb(skb);
864745d2 896 return ERR_PTR(err);
1da177e4
LT		 897 }
898
899 return skb;
900}
901
7deb2264
TG		 902static inline size_t xfrm_spdinfo_msgsize(void)
903{
904 return NLMSG_ALIGN(4)
905 + nla_total_size(sizeof(struct xfrmu_spdinfo))
906 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
907}
908
e071041b
AD		 909static int build_spdinfo(struct sk_buff *skb, struct net *net,
910 u32 pid, u32 seq, u32 flags)
ecfd6b18 911{
5a6d3416
JHS		 912 struct xfrmk_spdinfo si;
913 struct xfrmu_spdinfo spc;
914 struct xfrmu_spdhinfo sph;
ecfd6b18 915 struct nlmsghdr *nlh;
1d1e34dd 916 int err;
ecfd6b18
JHS		 917 u32 *f;
918
919 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
25985edc 920 if (nlh == NULL) /* shouldn't really happen ... */
ecfd6b18
JHS		 921 return -EMSGSIZE;
922
923 f = nlmsg_data(nlh);
924 *f = flags;
e071041b 925 xfrm_spd_getinfo(net, &si);
5a6d3416
JHS		 926 spc.incnt = si.incnt;
927 spc.outcnt = si.outcnt;
928 spc.fwdcnt = si.fwdcnt;
929 spc.inscnt = si.inscnt;
930 spc.outscnt = si.outscnt;
931 spc.fwdscnt = si.fwdscnt;
932 sph.spdhcnt = si.spdhcnt;
933 sph.spdhmcnt = si.spdhmcnt;
934
1d1e34dd
DM		 935 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
936 if (!err)
937 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
938 if (err) {
939 nlmsg_cancel(skb, nlh);
940 return err;
941 }
ecfd6b18
JHS		 942
943 return nlmsg_end(skb, nlh);
ecfd6b18
JHS		 944}
945
946static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 947 struct nlattr **attrs)
ecfd6b18 948{
a6483b79 949 struct net *net = sock_net(skb->sk);
ecfd6b18 950 struct sk_buff *r_skb;
7b67c857 951 u32 *flags = nlmsg_data(nlh);
ecfd6b18
JHS		 952 u32 spid = NETLINK_CB(skb).pid;
953 u32 seq = nlh->nlmsg_seq;
ecfd6b18 954
7deb2264 955 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
ecfd6b18
JHS		 956 if (r_skb == NULL)
957 return -ENOMEM;
958
e071041b 959 if (build_spdinfo(r_skb, net, spid, seq, *flags) < 0)
ecfd6b18
JHS		 960 BUG();
961
a6483b79 962 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
ecfd6b18
JHS		 963}
964
7deb2264
TG		 965static inline size_t xfrm_sadinfo_msgsize(void)
966{
967 return NLMSG_ALIGN(4)
968 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
969 + nla_total_size(4); /* XFRMA_SAD_CNT */
970}
971
e071041b
AD		 972static int build_sadinfo(struct sk_buff *skb, struct net *net,
973 u32 pid, u32 seq, u32 flags)
28d8909b 974{
af11e316
JHS		 975 struct xfrmk_sadinfo si;
976 struct xfrmu_sadhinfo sh;
28d8909b 977 struct nlmsghdr *nlh;
1d1e34dd 978 int err;
28d8909b
JHS		 979 u32 *f;
980
981 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
25985edc 982 if (nlh == NULL) /* shouldn't really happen ... */
28d8909b
JHS		 983 return -EMSGSIZE;
984
985 f = nlmsg_data(nlh);
986 *f = flags;
e071041b 987 xfrm_sad_getinfo(net, &si);
28d8909b 988
af11e316
JHS		 989 sh.sadhmcnt = si.sadhmcnt;
990 sh.sadhcnt = si.sadhcnt;
991
1d1e34dd
DM		 992 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
993 if (!err)
994 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
995 if (err) {
996 nlmsg_cancel(skb, nlh);
997 return err;
998 }
28d8909b
JHS		 999
1000 return nlmsg_end(skb, nlh);
28d8909b
JHS		 1001}
1002
1003static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1004 struct nlattr **attrs)
28d8909b 1005{
a6483b79 1006 struct net *net = sock_net(skb->sk);
28d8909b 1007 struct sk_buff *r_skb;
7b67c857 1008 u32 *flags = nlmsg_data(nlh);
28d8909b
JHS		 1009 u32 spid = NETLINK_CB(skb).pid;
1010 u32 seq = nlh->nlmsg_seq;
28d8909b 1011
7deb2264 1012 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
28d8909b
JHS		 1013 if (r_skb == NULL)
1014 return -ENOMEM;
1015
e071041b 1016 if (build_sadinfo(r_skb, net, spid, seq, *flags) < 0)
28d8909b
JHS		 1017 BUG();
1018
a6483b79 1019 return nlmsg_unicast(net->xfrm.nlsk, r_skb, spid);
28d8909b
JHS		 1020}
1021
22e70050 1022static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1023 struct nlattr **attrs)
1da177e4 1024{
fc34acd3 1025 struct net *net = sock_net(skb->sk);
7b67c857 1026 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1da177e4
LT		 1027 struct xfrm_state *x;
1028 struct sk_buff *resp_skb;
eb2971b6 1029 int err = -ESRCH;
1da177e4 1030
fc34acd3 1031 x = xfrm_user_state_lookup(net, p, attrs, &err);
1da177e4
LT		 1032 if (x == NULL)
1033 goto out_noput;
1034
1035 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1036 if (IS_ERR(resp_skb)) {
1037 err = PTR_ERR(resp_skb);
1038 } else {
a6483b79 1039 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 1040 }
1041 xfrm_state_put(x);
1042out_noput:
1043 return err;
1044}
1045
1046static int verify_userspi_info(struct xfrm_userspi_info *p)
1047{
1048 switch (p->info.id.proto) {
1049 case IPPROTO_AH:
1050 case IPPROTO_ESP:
1051 break;
1052
1053 case IPPROTO_COMP:
1054 /* IPCOMP spi is 16-bits. */
1055 if (p->max >= 0x10000)
1056 return -EINVAL;
1057 break;
1058
1059 default:
1060 return -EINVAL;
3ff50b79 1061 }
1da177e4
LT		 1062
1063 if (p->min > p->max)
1064 return -EINVAL;
1065
1066 return 0;
1067}
1068
22e70050 1069static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1070 struct nlattr **attrs)
1da177e4 1071{
fc34acd3 1072 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1073 struct xfrm_state *x;
1074 struct xfrm_userspi_info *p;
1075 struct sk_buff *resp_skb;
1076 xfrm_address_t *daddr;
1077 int family;
1078 int err;
6f26b61e
JHS		 1079 u32 mark;
1080 struct xfrm_mark m;
1da177e4 1081
7b67c857 1082 p = nlmsg_data(nlh);
1da177e4
LT		 1083 err = verify_userspi_info(p);
1084 if (err)
1085 goto out_noput;
1086
1087 family = p->info.family;
1088 daddr = &p->info.id.daddr;
1089
1090 x = NULL;
6f26b61e
JHS		 1091
1092 mark = xfrm_mark_get(attrs, &m);
1da177e4 1093 if (p->info.seq) {
6f26b61e 1094 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1da177e4
LT		 1095 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1096 xfrm_state_put(x);
1097 x = NULL;
1098 }
1099 }
1100
1101 if (!x)
6f26b61e 1102 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1da177e4
LT		 1103 p->info.id.proto, daddr,
1104 &p->info.saddr, 1,
1105 family);
1106 err = -ENOENT;
1107 if (x == NULL)
1108 goto out_noput;
1109
658b219e
HX		 1110 err = xfrm_alloc_spi(x, p->min, p->max);
1111 if (err)
1112 goto out;
1da177e4 1113
658b219e 1114 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1da177e4
LT		 1115 if (IS_ERR(resp_skb)) {
1116 err = PTR_ERR(resp_skb);
1117 goto out;
1118 }
1119
a6483b79 1120 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).pid);
1da177e4
LT		 1121
1122out:
1123 xfrm_state_put(x);
1124out_noput:
1125 return err;
1126}
1127
b798a9ed 1128static int verify_policy_dir(u8 dir)
1da177e4
LT		 1129{
1130 switch (dir) {
1131 case XFRM_POLICY_IN:
1132 case XFRM_POLICY_OUT:
1133 case XFRM_POLICY_FWD:
1134 break;
1135
1136 default:
1137 return -EINVAL;
3ff50b79 1138 }
1da177e4
LT		 1139
1140 return 0;
1141}
1142
b798a9ed 1143static int verify_policy_type(u8 type)
f7b6983f
MN		 1144{
1145 switch (type) {
1146 case XFRM_POLICY_TYPE_MAIN:
1147#ifdef CONFIG_XFRM_SUB_POLICY
1148 case XFRM_POLICY_TYPE_SUB:
1149#endif
1150 break;
1151
1152 default:
1153 return -EINVAL;
3ff50b79 1154 }
f7b6983f
MN		 1155
1156 return 0;
1157}
1158
1da177e4
LT		 1159static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1160{
1161 switch (p->share) {
1162 case XFRM_SHARE_ANY:
1163 case XFRM_SHARE_SESSION:
1164 case XFRM_SHARE_USER:
1165 case XFRM_SHARE_UNIQUE:
1166 break;
1167
1168 default:
1169 return -EINVAL;
3ff50b79 1170 }
1da177e4
LT		 1171
1172 switch (p->action) {
1173 case XFRM_POLICY_ALLOW:
1174 case XFRM_POLICY_BLOCK:
1175 break;
1176
1177 default:
1178 return -EINVAL;
3ff50b79 1179 }
1da177e4
LT		 1180
1181 switch (p->sel.family) {
1182 case AF_INET:
1183 break;
1184
1185 case AF_INET6:
dfd56b8b 1186#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 1187 break;
1188#else
1189 return -EAFNOSUPPORT;
1190#endif
1191
1192 default:
1193 return -EINVAL;
3ff50b79 1194 }
1da177e4
LT		 1195
1196 return verify_policy_dir(p->dir);
1197}
1198
5424f32e 1199static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
df71837d 1200{
5424f32e 1201 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
df71837d
TJ		 1202 struct xfrm_user_sec_ctx *uctx;
1203
1204 if (!rt)
1205 return 0;
1206
5424f32e 1207 uctx = nla_data(rt);
03e1ad7b 1208 return security_xfrm_policy_alloc(&pol->security, uctx);
df71837d
TJ		 1209}
1210
1da177e4
LT		 1211static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1212 int nr)
1213{
1214 int i;
1215
1216 xp->xfrm_nr = nr;
1217 for (i = 0; i < nr; i++, ut++) {
1218 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1219
1220 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1221 memcpy(&t->saddr, &ut->saddr,
1222 sizeof(xfrm_address_t));
1223 t->reqid = ut->reqid;
1224 t->mode = ut->mode;
1225 t->share = ut->share;
1226 t->optional = ut->optional;
1227 t->aalgos = ut->aalgos;
1228 t->ealgos = ut->ealgos;
1229 t->calgos = ut->calgos;
c5d18e98
HX		 1230 /* If all masks are ~0, then we allow all algorithms. */
1231 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
8511d01d 1232 t->encap_family = ut->family;
1da177e4
LT		 1233 }
1234}
1235
b4ad86bf
DM		 1236static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1237{
1238 int i;
1239
1240 if (nr > XFRM_MAX_DEPTH)
1241 return -EINVAL;
1242
1243 for (i = 0; i < nr; i++) {
1244 /* We never validated the ut->family value, so many
1245 * applications simply leave it at zero. The check was
1246 * never made and ut->family was ignored because all
1247 * templates could be assumed to have the same family as
1248 * the policy itself. Now that we will have ipv4-in-ipv6
1249 * and ipv6-in-ipv4 tunnels, this is no longer true.
1250 */
1251 if (!ut[i].family)
1252 ut[i].family = family;
1253
1254 switch (ut[i].family) {
1255 case AF_INET:
1256 break;
dfd56b8b 1257#if IS_ENABLED(CONFIG_IPV6)
b4ad86bf
DM		 1258 case AF_INET6:
1259 break;
1260#endif
1261 default:
1262 return -EINVAL;
3ff50b79 1263 }
b4ad86bf
DM		 1264 }
1265
1266 return 0;
1267}
1268
5424f32e 1269static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1da177e4 1270{
5424f32e 1271 struct nlattr *rt = attrs[XFRMA_TMPL];
1da177e4
LT		 1272
1273 if (!rt) {
1274 pol->xfrm_nr = 0;
1275 } else {
5424f32e
TG		 1276 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1277 int nr = nla_len(rt) / sizeof(*utmpl);
b4ad86bf 1278 int err;
1da177e4 1279
b4ad86bf
DM		 1280 err = validate_tmpl(nr, utmpl, pol->family);
1281 if (err)
1282 return err;
1da177e4 1283
5424f32e 1284 copy_templates(pol, utmpl, nr);
1da177e4
LT		 1285 }
1286 return 0;
1287}
1288
5424f32e 1289static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
f7b6983f 1290{
5424f32e 1291 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
f7b6983f 1292 struct xfrm_userpolicy_type *upt;
b798a9ed 1293 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f
MN		 1294 int err;
1295
1296 if (rt) {
5424f32e 1297 upt = nla_data(rt);
f7b6983f
MN		 1298 type = upt->type;
1299 }
1300
1301 err = verify_policy_type(type);
1302 if (err)
1303 return err;
1304
1305 *tp = type;
1306 return 0;
1307}
1308
1da177e4
LT		 1309static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1310{
1311 xp->priority = p->priority;
1312 xp->index = p->index;
1313 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1314 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1315 xp->action = p->action;
1316 xp->flags = p->flags;
1317 xp->family = p->sel.family;
1318 /* XXX xp->share = p->share; */
1319}
1320
1321static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1322{
7b789836 1323 memset(p, 0, sizeof(*p));
1da177e4
LT		 1324 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1325 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1326 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1327 p->priority = xp->priority;
1328 p->index = xp->index;
1329 p->sel.family = xp->family;
1330 p->dir = dir;
1331 p->action = xp->action;
1332 p->flags = xp->flags;
1333 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1334}
1335
fc34acd3 1336static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1da177e4 1337{
fc34acd3 1338 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1da177e4
LT		 1339 int err;
1340
1341 if (!xp) {
1342 *errp = -ENOMEM;
1343 return NULL;
1344 }
1345
1346 copy_from_user_policy(xp, p);
df71837d 1347
35a7aa08 1348 err = copy_from_user_policy_type(&xp->type, attrs);
f7b6983f
MN		 1349 if (err)
1350 goto error;
1351
35a7aa08
TG		 1352 if (!(err = copy_from_user_tmpl(xp, attrs)))
1353 err = copy_from_user_sec_ctx(xp, attrs);
f7b6983f
MN		 1354 if (err)
1355 goto error;
1da177e4 1356
295fae56
JHS		 1357 xfrm_mark_get(attrs, &xp->mark);
1358
1da177e4 1359 return xp;
f7b6983f
MN		 1360 error:
1361 *errp = err;
12a169e7 1362 xp->walk.dead = 1;
64c31b3f 1363 xfrm_policy_destroy(xp);
f7b6983f 1364 return NULL;
1da177e4
LT		 1365}
1366
22e70050 1367static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1368 struct nlattr **attrs)
1da177e4 1369{
fc34acd3 1370 struct net *net = sock_net(skb->sk);
7b67c857 1371 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1da177e4 1372 struct xfrm_policy *xp;
26b15dad 1373 struct km_event c;
1da177e4
LT		 1374 int err;
1375 int excl;
c53fa1ed
PM		 1376 uid_t loginuid = audit_get_loginuid(current);
1377 u32 sessionid = audit_get_sessionid(current);
1378 u32 sid;
1da177e4
LT		 1379
1380 err = verify_newpolicy_info(p);
df71837d
TJ		 1381 if (err)
1382 return err;
35a7aa08 1383 err = verify_sec_ctx_len(attrs);
1da177e4
LT		 1384 if (err)
1385 return err;
1386
fc34acd3 1387 xp = xfrm_policy_construct(net, p, attrs, &err);
1da177e4
LT		 1388 if (!xp)
1389 return err;
1390
25985edc 1391 /* shouldn't excl be based on nlh flags??
26b15dad
JHS		 1392 * Aha! this is anti-netlink really i.e more pfkey derived
1393 * in netlink excl is a flag and you wouldnt need
1394 * a type XFRM_MSG_UPDPOLICY - JHS */
1da177e4
LT		 1395 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1396 err = xfrm_policy_insert(p->dir, xp, excl);
c53fa1ed 1397 security_task_getsecid(current, &sid);
2532386f 1398 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
161a09e7 1399
1da177e4 1400 if (err) {
03e1ad7b 1401 security_xfrm_policy_free(xp->security);
1da177e4
LT		 1402 kfree(xp);
1403 return err;
1404 }
1405
f60f6b8f 1406 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1407 c.seq = nlh->nlmsg_seq;
1408 c.pid = nlh->nlmsg_pid;
1409 km_policy_notify(xp, p->dir, &c);
1410
1da177e4
LT		 1411 xfrm_pol_put(xp);
1412
1413 return 0;
1414}
1415
1416static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1417{
1418 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1419 int i;
1420
1421 if (xp->xfrm_nr == 0)
1422 return 0;
1423
1424 for (i = 0; i < xp->xfrm_nr; i++) {
1425 struct xfrm_user_tmpl *up = &vec[i];
1426 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1427
1f86840f 1428 memset(up, 0, sizeof(*up));
1da177e4 1429 memcpy(&up->id, &kp->id, sizeof(up->id));
8511d01d 1430 up->family = kp->encap_family;
1da177e4
LT		 1431 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1432 up->reqid = kp->reqid;
1433 up->mode = kp->mode;
1434 up->share = kp->share;
1435 up->optional = kp->optional;
1436 up->aalgos = kp->aalgos;
1437 up->ealgos = kp->ealgos;
1438 up->calgos = kp->calgos;
1439 }
df71837d 1440
c0144bea
TG		 1441 return nla_put(skb, XFRMA_TMPL,
1442 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
0d681623
SH		 1443}
1444
1445static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1446{
1447 if (x->security) {
1448 return copy_sec_ctx(x->security, skb);
df71837d
TJ		 1449 }
1450 return 0;
0d681623 1451}
df71837d 1452
0d681623
SH		 1453static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1454{
1d1e34dd 1455 if (xp->security)
0d681623 1456 return copy_sec_ctx(xp->security, skb);
0d681623 1457 return 0;
df71837d 1458}
cfbfd45a
TG		 1459static inline size_t userpolicy_type_attrsize(void)
1460{
1461#ifdef CONFIG_XFRM_SUB_POLICY
1462 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1463#else
1464 return 0;
1465#endif
1466}
df71837d 1467
f7b6983f 1468#ifdef CONFIG_XFRM_SUB_POLICY
b798a9ed 1469static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f 1470{
c0144bea
TG		 1471 struct xfrm_userpolicy_type upt = {
1472 .type = type,
1473 };
f7b6983f 1474
c0144bea 1475 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
f7b6983f
MN		 1476}
1477
1478#else
b798a9ed 1479static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
f7b6983f
MN		 1480{
1481 return 0;
1482}
1483#endif
1484
1da177e4
LT		 1485static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1486{
1487 struct xfrm_dump_info *sp = ptr;
1488 struct xfrm_userpolicy_info *p;
1489 struct sk_buff *in_skb = sp->in_skb;
1490 struct sk_buff *skb = sp->out_skb;
1491 struct nlmsghdr *nlh;
1d1e34dd 1492 int err;
1da177e4 1493
79b8b7f4
TG		 1494 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1495 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1496 if (nlh == NULL)
1497 return -EMSGSIZE;
1da177e4 1498
7b67c857 1499 p = nlmsg_data(nlh);
1da177e4 1500 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 1501 err = copy_to_user_tmpl(xp, skb);
1502 if (!err)
1503 err = copy_to_user_sec_ctx(xp, skb);
1504 if (!err)
1505 err = copy_to_user_policy_type(xp->type, skb);
1506 if (!err)
1507 err = xfrm_mark_put(skb, &xp->mark);
1508 if (err) {
1509 nlmsg_cancel(skb, nlh);
1510 return err;
1511 }
9825069d 1512 nlmsg_end(skb, nlh);
1da177e4 1513 return 0;
1da177e4
LT		 1514}
1515
4c563f76
TT		 1516static int xfrm_dump_policy_done(struct netlink_callback *cb)
1517{
1518 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1519
1520 xfrm_policy_walk_done(walk);
1521 return 0;
1522}
1523
1da177e4
LT		 1524static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1525{
fc34acd3 1526 struct net *net = sock_net(skb->sk);
4c563f76 1527 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1da177e4
LT		 1528 struct xfrm_dump_info info;
1529
4c563f76
TT		 1530 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1531 sizeof(cb->args) - sizeof(cb->args[0]));
1532
1da177e4
LT		 1533 info.in_skb = cb->skb;
1534 info.out_skb = skb;
1535 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1536 info.nlmsg_flags = NLM_F_MULTI;
4c563f76
TT		 1537
1538 if (!cb->args[0]) {
1539 cb->args[0] = 1;
1540 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1541 }
1542
fc34acd3 1543 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1da177e4
LT		 1544
1545 return skb->len;
1546}
1547
1548static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1549 struct xfrm_policy *xp,
1550 int dir, u32 seq)
1551{
1552 struct xfrm_dump_info info;
1553 struct sk_buff *skb;
c2546372 1554 int err;
1da177e4 1555
7deb2264 1556 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1da177e4
LT		 1557 if (!skb)
1558 return ERR_PTR(-ENOMEM);
1559
1da177e4
LT		 1560 info.in_skb = in_skb;
1561 info.out_skb = skb;
1562 info.nlmsg_seq = seq;
1563 info.nlmsg_flags = 0;
1da177e4 1564
c2546372
MK		 1565 err = dump_one_policy(xp, dir, 0, &info);
1566 if (err) {
1da177e4 1567 kfree_skb(skb);
c2546372 1568 return ERR_PTR(err);
1da177e4
LT		 1569 }
1570
1571 return skb;
1572}
1573
22e70050 1574static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1575 struct nlattr **attrs)
1da177e4 1576{
fc34acd3 1577 struct net *net = sock_net(skb->sk);
1da177e4
LT		 1578 struct xfrm_policy *xp;
1579 struct xfrm_userpolicy_id *p;
b798a9ed 1580 u8 type = XFRM_POLICY_TYPE_MAIN;
1da177e4 1581 int err;
26b15dad 1582 struct km_event c;
1da177e4 1583 int delete;
295fae56
JHS		 1584 struct xfrm_mark m;
1585 u32 mark = xfrm_mark_get(attrs, &m);
1da177e4 1586
7b67c857 1587 p = nlmsg_data(nlh);
1da177e4
LT		 1588 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1589
35a7aa08 1590 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1591 if (err)
1592 return err;
1593
1da177e4
LT		 1594 err = verify_policy_dir(p->dir);
1595 if (err)
1596 return err;
1597
1598 if (p->index)
295fae56 1599 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
df71837d 1600 else {
5424f32e 1601 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1602 struct xfrm_sec_ctx *ctx;
df71837d 1603
35a7aa08 1604 err = verify_sec_ctx_len(attrs);
df71837d
TJ		 1605 if (err)
1606 return err;
1607
2c8dd116 1608 ctx = NULL;
df71837d 1609 if (rt) {
5424f32e 1610 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
df71837d 1611
03e1ad7b
PM		 1612 err = security_xfrm_policy_alloc(&ctx, uctx);
1613 if (err)
df71837d 1614 return err;
2c8dd116 1615 }
295fae56 1616 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
6f26b61e 1617 ctx, delete, &err);
03e1ad7b 1618 security_xfrm_policy_free(ctx);
df71837d 1619 }
1da177e4
LT		 1620 if (xp == NULL)
1621 return -ENOENT;
1622
1623 if (!delete) {
1624 struct sk_buff *resp_skb;
1625
1626 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1627 if (IS_ERR(resp_skb)) {
1628 err = PTR_ERR(resp_skb);
1629 } else {
a6483b79 1630 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
082a1ad5 1631 NETLINK_CB(skb).pid);
1da177e4 1632 }
26b15dad 1633 } else {
c53fa1ed
PM		 1634 uid_t loginuid = audit_get_loginuid(current);
1635 u32 sessionid = audit_get_sessionid(current);
1636 u32 sid;
2532386f 1637
c53fa1ed 1638 security_task_getsecid(current, &sid);
2532386f
EP		 1639 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1640 sid);
13fcfbb0
DM		 1641
1642 if (err != 0)
c8c05a8e 1643 goto out;
13fcfbb0 1644
e7443892 1645 c.data.byid = p->index;
f60f6b8f 1646 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1647 c.seq = nlh->nlmsg_seq;
1648 c.pid = nlh->nlmsg_pid;
1649 km_policy_notify(xp, p->dir, &c);
1da177e4
LT		 1650 }
1651
c8c05a8e 1652out:
ef41aaa0 1653 xfrm_pol_put(xp);
1da177e4
LT		 1654 return err;
1655}
1656
22e70050 1657static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1658 struct nlattr **attrs)
1da177e4 1659{
fc34acd3 1660 struct net *net = sock_net(skb->sk);
26b15dad 1661 struct km_event c;
7b67c857 1662 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
161a09e7 1663 struct xfrm_audit audit_info;
4aa2e62c 1664 int err;
1da177e4 1665
c53fa1ed
PM		 1666 audit_info.loginuid = audit_get_loginuid(current);
1667 audit_info.sessionid = audit_get_sessionid(current);
1668 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1669 err = xfrm_state_flush(net, p->proto, &audit_info);
9e64cc95
JHS		 1670 if (err) {
1671 if (err == -ESRCH) /* empty table */
1672 return 0;
069c474e 1673 return err;
9e64cc95 1674 }
bf08867f 1675 c.data.proto = p->proto;
f60f6b8f 1676 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1677 c.seq = nlh->nlmsg_seq;
1678 c.pid = nlh->nlmsg_pid;
7067802e 1679 c.net = net;
26b15dad
JHS		 1680 km_state_notify(NULL, &c);
1681
1da177e4
LT		 1682 return 0;
1683}
1684
d8647b79 1685static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
7deb2264 1686{
d8647b79
SK		 1687 size_t replay_size = x->replay_esn ?
1688 xfrm_replay_state_esn_len(x->replay_esn) :
1689 sizeof(struct xfrm_replay_state);
1690
7deb2264 1691 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
d8647b79 1692 + nla_total_size(replay_size)
7deb2264 1693 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
6f26b61e 1694 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 1695 + nla_total_size(4) /* XFRM_AE_RTHR */
1696 + nla_total_size(4); /* XFRM_AE_ETHR */
1697}
d51d081d 1698
214e005b 1699static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
d51d081d
JHS		 1700{
1701 struct xfrm_aevent_id *id;
1702 struct nlmsghdr *nlh;
1d1e34dd 1703 int err;
d51d081d 1704
79b8b7f4
TG		 1705 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1706 if (nlh == NULL)
1707 return -EMSGSIZE;
d51d081d 1708
7b67c857 1709 id = nlmsg_data(nlh);
2b5f6dcc 1710 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
d51d081d
JHS		 1711 id->sa_id.spi = x->id.spi;
1712 id->sa_id.family = x->props.family;
1713 id->sa_id.proto = x->id.proto;
2b5f6dcc
JHS		 1714 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1715 id->reqid = x->props.reqid;
d51d081d
JHS		 1716 id->flags = c->data.aevent;
1717
d0fde795 1718 if (x->replay_esn) {
1d1e34dd
DM		 1719 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1720 xfrm_replay_state_esn_len(x->replay_esn),
1721 x->replay_esn);
d0fde795 1722 } else {
1d1e34dd
DM		 1723 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1724 &x->replay);
d0fde795 1725 }
1d1e34dd
DM		 1726 if (err)
1727 goto out_cancel;
1728 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1729 if (err)
1730 goto out_cancel;
d51d081d 1731
1d1e34dd
DM		 1732 if (id->flags & XFRM_AE_RTHR) {
1733 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1734 if (err)
1735 goto out_cancel;
1736 }
1737 if (id->flags & XFRM_AE_ETHR) {
1738 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1739 x->replay_maxage * 10 / HZ);
1740 if (err)
1741 goto out_cancel;
1742 }
1743 err = xfrm_mark_put(skb, &x->mark);
1744 if (err)
1745 goto out_cancel;
6f26b61e 1746
9825069d 1747 return nlmsg_end(skb, nlh);
d51d081d 1748
1d1e34dd 1749out_cancel:
9825069d 1750 nlmsg_cancel(skb, nlh);
1d1e34dd 1751 return err;
d51d081d
JHS		 1752}
1753
22e70050 1754static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1755 struct nlattr **attrs)
d51d081d 1756{
fc34acd3 1757 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1758 struct xfrm_state *x;
1759 struct sk_buff *r_skb;
1760 int err;
1761 struct km_event c;
6f26b61e
JHS		 1762 u32 mark;
1763 struct xfrm_mark m;
7b67c857 1764 struct xfrm_aevent_id *p = nlmsg_data(nlh);
d51d081d
JHS		 1765 struct xfrm_usersa_id *id = &p->sa_id;
1766
6f26b61e
JHS		 1767 mark = xfrm_mark_get(attrs, &m);
1768
1769 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
d8647b79 1770 if (x == NULL)
d51d081d 1771 return -ESRCH;
d8647b79
SK		 1772
1773 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1774 if (r_skb == NULL) {
1775 xfrm_state_put(x);
1776 return -ENOMEM;
d51d081d
JHS		 1777 }
1778
1779 /*
1780 * XXX: is this lock really needed - none of the other
1781 * gets lock (the concern is things getting updated
1782 * while we are still reading) - jhs
1783 */
1784 spin_lock_bh(&x->lock);
1785 c.data.aevent = p->flags;
1786 c.seq = nlh->nlmsg_seq;
1787 c.pid = nlh->nlmsg_pid;
1788
1789 if (build_aevent(r_skb, x, &c) < 0)
1790 BUG();
a6483b79 1791 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).pid);
d51d081d
JHS		 1792 spin_unlock_bh(&x->lock);
1793 xfrm_state_put(x);
1794 return err;
1795}
1796
22e70050 1797static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1798 struct nlattr **attrs)
d51d081d 1799{
fc34acd3 1800 struct net *net = sock_net(skb->sk);
d51d081d
JHS		 1801 struct xfrm_state *x;
1802 struct km_event c;
1803 int err = - EINVAL;
6f26b61e
JHS		 1804 u32 mark = 0;
1805 struct xfrm_mark m;
7b67c857 1806 struct xfrm_aevent_id *p = nlmsg_data(nlh);
5424f32e 1807 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
d8647b79 1808 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
5424f32e 1809 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
d51d081d 1810
d8647b79 1811 if (!lt && !rp && !re)
d51d081d
JHS		 1812 return err;
1813
1814 /* pedantic mode - thou shalt sayeth replaceth */
1815 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1816 return err;
1817
6f26b61e
JHS		 1818 mark = xfrm_mark_get(attrs, &m);
1819
1820 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
d51d081d
JHS		 1821 if (x == NULL)
1822 return -ESRCH;
1823
1824 if (x->km.state != XFRM_STATE_VALID)
1825 goto out;
1826
e2b19125
SK		 1827 err = xfrm_replay_verify_len(x->replay_esn, rp);
1828 if (err)
1829 goto out;
1830
d51d081d 1831 spin_lock_bh(&x->lock);
35a7aa08 1832 xfrm_update_ae_params(x, attrs);
d51d081d 1833 spin_unlock_bh(&x->lock);
d51d081d
JHS		 1834
1835 c.event = nlh->nlmsg_type;
1836 c.seq = nlh->nlmsg_seq;
1837 c.pid = nlh->nlmsg_pid;
1838 c.data.aevent = XFRM_AE_CU;
1839 km_state_notify(x, &c);
1840 err = 0;
1841out:
1842 xfrm_state_put(x);
1843 return err;
1844}
1845
22e70050 1846static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1847 struct nlattr **attrs)
1da177e4 1848{
fc34acd3 1849 struct net *net = sock_net(skb->sk);
f7b6983f 1850 struct km_event c;
b798a9ed 1851 u8 type = XFRM_POLICY_TYPE_MAIN;
f7b6983f 1852 int err;
161a09e7 1853 struct xfrm_audit audit_info;
f7b6983f 1854
35a7aa08 1855 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1856 if (err)
1857 return err;
26b15dad 1858
c53fa1ed
PM		 1859 audit_info.loginuid = audit_get_loginuid(current);
1860 audit_info.sessionid = audit_get_sessionid(current);
1861 security_task_getsecid(current, &audit_info.secid);
fc34acd3 1862 err = xfrm_policy_flush(net, type, &audit_info);
2f1eb65f
JHS		 1863 if (err) {
1864 if (err == -ESRCH) /* empty table */
1865 return 0;
069c474e 1866 return err;
2f1eb65f
JHS		 1867 }
1868
f7b6983f 1869 c.data.type = type;
f60f6b8f 1870 c.event = nlh->nlmsg_type;
26b15dad
JHS		 1871 c.seq = nlh->nlmsg_seq;
1872 c.pid = nlh->nlmsg_pid;
7067802e 1873 c.net = net;
26b15dad 1874 km_policy_notify(NULL, 0, &c);
1da177e4
LT		 1875 return 0;
1876}
1877
22e70050 1878static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1879 struct nlattr **attrs)
6c5c8ca7 1880{
fc34acd3 1881 struct net *net = sock_net(skb->sk);
6c5c8ca7 1882 struct xfrm_policy *xp;
7b67c857 1883 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
6c5c8ca7 1884 struct xfrm_userpolicy_info *p = &up->pol;
b798a9ed 1885 u8 type = XFRM_POLICY_TYPE_MAIN;
6c5c8ca7 1886 int err = -ENOENT;
295fae56
JHS		 1887 struct xfrm_mark m;
1888 u32 mark = xfrm_mark_get(attrs, &m);
6c5c8ca7 1889
35a7aa08 1890 err = copy_from_user_policy_type(&type, attrs);
f7b6983f
MN		 1891 if (err)
1892 return err;
1893
c8bf4d04
TT		 1894 err = verify_policy_dir(p->dir);
1895 if (err)
1896 return err;
1897
6c5c8ca7 1898 if (p->index)
295fae56 1899 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
6c5c8ca7 1900 else {
5424f32e 1901 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
03e1ad7b 1902 struct xfrm_sec_ctx *ctx;
6c5c8ca7 1903
35a7aa08 1904 err = verify_sec_ctx_len(attrs);
6c5c8ca7
JHS		 1905 if (err)
1906 return err;
1907
2c8dd116 1908 ctx = NULL;
6c5c8ca7 1909 if (rt) {
5424f32e 1910 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
6c5c8ca7 1911
03e1ad7b
PM		 1912 err = security_xfrm_policy_alloc(&ctx, uctx);
1913 if (err)
6c5c8ca7 1914 return err;
2c8dd116 1915 }
295fae56 1916 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
6f26b61e 1917 &p->sel, ctx, 0, &err);
03e1ad7b 1918 security_xfrm_policy_free(ctx);
6c5c8ca7 1919 }
6c5c8ca7 1920 if (xp == NULL)
ef41aaa0 1921 return -ENOENT;
03e1ad7b 1922
ea2dea9d 1923 if (unlikely(xp->walk.dead))
6c5c8ca7 1924 goto out;
6c5c8ca7 1925
6c5c8ca7
JHS		 1926 err = 0;
1927 if (up->hard) {
c53fa1ed
PM		 1928 uid_t loginuid = audit_get_loginuid(current);
1929 u32 sessionid = audit_get_sessionid(current);
1930 u32 sid;
1931
1932 security_task_getsecid(current, &sid);
6c5c8ca7 1933 xfrm_policy_delete(xp, p->dir);
2532386f 1934 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
161a09e7 1935
6c5c8ca7
JHS		 1936 } else {
1937 // reset the timers here?
62db5cfd 1938 WARN(1, "Dont know what to do with soft policy expire\n");
6c5c8ca7
JHS		 1939 }
1940 km_policy_expired(xp, p->dir, up->hard, current->pid);
1941
1942out:
1943 xfrm_pol_put(xp);
1944 return err;
1945}
1946
22e70050 1947static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1948 struct nlattr **attrs)
53bc6b4d 1949{
fc34acd3 1950 struct net *net = sock_net(skb->sk);
53bc6b4d
JHS		 1951 struct xfrm_state *x;
1952 int err;
7b67c857 1953 struct xfrm_user_expire *ue = nlmsg_data(nlh);
53bc6b4d 1954 struct xfrm_usersa_info *p = &ue->state;
6f26b61e 1955 struct xfrm_mark m;
928497f0 1956 u32 mark = xfrm_mark_get(attrs, &m);
53bc6b4d 1957
6f26b61e 1958 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
53bc6b4d 1959
3a765aa5 1960 err = -ENOENT;
53bc6b4d
JHS		 1961 if (x == NULL)
1962 return err;
1963
53bc6b4d 1964 spin_lock_bh(&x->lock);
3a765aa5 1965 err = -EINVAL;
53bc6b4d
JHS		 1966 if (x->km.state != XFRM_STATE_VALID)
1967 goto out;
1968 km_state_expired(x, ue->hard, current->pid);
1969
161a09e7 1970 if (ue->hard) {
c53fa1ed
PM		 1971 uid_t loginuid = audit_get_loginuid(current);
1972 u32 sessionid = audit_get_sessionid(current);
1973 u32 sid;
1974
1975 security_task_getsecid(current, &sid);
53bc6b4d 1976 __xfrm_state_delete(x);
2532386f 1977 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
161a09e7 1978 }
3a765aa5 1979 err = 0;
53bc6b4d
JHS		 1980out:
1981 spin_unlock_bh(&x->lock);
1982 xfrm_state_put(x);
1983 return err;
1984}
1985
22e70050 1986static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 1987 struct nlattr **attrs)
980ebd25 1988{
fc34acd3 1989 struct net *net = sock_net(skb->sk);
980ebd25
JHS		 1990 struct xfrm_policy *xp;
1991 struct xfrm_user_tmpl *ut;
1992 int i;
5424f32e 1993 struct nlattr *rt = attrs[XFRMA_TMPL];
6f26b61e 1994 struct xfrm_mark mark;
980ebd25 1995
7b67c857 1996 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
fc34acd3 1997 struct xfrm_state *x = xfrm_state_alloc(net);
980ebd25
JHS		 1998 int err = -ENOMEM;
1999
2000 if (!x)
d8eb9307 2001 goto nomem;
980ebd25 2002
6f26b61e
JHS		 2003 xfrm_mark_get(attrs, &mark);
2004
980ebd25 2005 err = verify_newpolicy_info(&ua->policy);
d8eb9307
IJ		 2006 if (err)
2007 goto bad_policy;
980ebd25
JHS		 2008
2009 /* build an XP */
fc34acd3 2010 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
d8eb9307
IJ		 2011 if (!xp)
2012 goto free_state;
980ebd25
JHS		 2013
2014 memcpy(&x->id, &ua->id, sizeof(ua->id));
2015 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2016 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
6f26b61e
JHS		 2017 xp->mark.m = x->mark.m = mark.m;
2018 xp->mark.v = x->mark.v = mark.v;
5424f32e 2019 ut = nla_data(rt);
980ebd25
JHS		 2020 /* extract the templates and for each call km_key */
2021 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2022 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2023 memcpy(&x->id, &t->id, sizeof(x->id));
2024 x->props.mode = t->mode;
2025 x->props.reqid = t->reqid;
2026 x->props.family = ut->family;
2027 t->aalgos = ua->aalgos;
2028 t->ealgos = ua->ealgos;
2029 t->calgos = ua->calgos;
2030 err = km_query(x, t, xp);
2031
2032 }
2033
2034 kfree(x);
2035 kfree(xp);
2036
2037 return 0;
d8eb9307
IJ		 2038
2039bad_policy:
62db5cfd 2040 WARN(1, "BAD policy passed\n");
d8eb9307
IJ		 2041free_state:
2042 kfree(x);
2043nomem:
2044 return err;
980ebd25
JHS		 2045}
2046
5c79de6e 2047#ifdef CONFIG_XFRM_MIGRATE
5c79de6e 2048static int copy_from_user_migrate(struct xfrm_migrate *ma,
13c1d189 2049 struct xfrm_kmaddress *k,
5424f32e 2050 struct nlattr **attrs, int *num)
5c79de6e 2051{
5424f32e 2052 struct nlattr *rt = attrs[XFRMA_MIGRATE];
5c79de6e
SS		 2053 struct xfrm_user_migrate *um;
2054 int i, num_migrate;
2055
13c1d189
AE		 2056 if (k != NULL) {
2057 struct xfrm_user_kmaddress *uk;
2058
2059 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2060 memcpy(&k->local, &uk->local, sizeof(k->local));
2061 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2062 k->family = uk->family;
2063 k->reserved = uk->reserved;
2064 }
2065
5424f32e
TG		 2066 um = nla_data(rt);
2067 num_migrate = nla_len(rt) / sizeof(*um);
5c79de6e
SS		 2068
2069 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2070 return -EINVAL;
2071
2072 for (i = 0; i < num_migrate; i++, um++, ma++) {
2073 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2074 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2075 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2076 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2077
2078 ma->proto = um->proto;
2079 ma->mode = um->mode;
2080 ma->reqid = um->reqid;
2081
2082 ma->old_family = um->old_family;
2083 ma->new_family = um->new_family;
2084 }
2085
2086 *num = i;
2087 return 0;
2088}
2089
2090static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2091 struct nlattr **attrs)
5c79de6e 2092{
7b67c857 2093 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
5c79de6e 2094 struct xfrm_migrate m[XFRM_MAX_DEPTH];
13c1d189 2095 struct xfrm_kmaddress km, *kmp;
5c79de6e
SS		 2096 u8 type;
2097 int err;
2098 int n = 0;
2099
35a7aa08 2100 if (attrs[XFRMA_MIGRATE] == NULL)
cf5cb79f 2101 return -EINVAL;
5c79de6e 2102
13c1d189
AE		 2103 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2104
5424f32e 2105 err = copy_from_user_policy_type(&type, attrs);
5c79de6e
SS		 2106 if (err)
2107 return err;
2108
13c1d189 2109 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
5c79de6e
SS		 2110 if (err)
2111 return err;
2112
2113 if (!n)
2114 return 0;
2115
13c1d189 2116 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
5c79de6e
SS		 2117
2118 return 0;
2119}
2120#else
2121static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
5424f32e 2122 struct nlattr **attrs)
5c79de6e
SS		 2123{
2124 return -ENOPROTOOPT;
2125}
2126#endif
2127
2128#ifdef CONFIG_XFRM_MIGRATE
183cad12 2129static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
5c79de6e
SS		 2130{
2131 struct xfrm_user_migrate um;
2132
2133 memset(&um, 0, sizeof(um));
2134 um.proto = m->proto;
2135 um.mode = m->mode;
2136 um.reqid = m->reqid;
2137 um.old_family = m->old_family;
2138 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2139 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2140 um.new_family = m->new_family;
2141 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2142 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2143
c0144bea 2144 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
5c79de6e
SS		 2145}
2146
183cad12 2147static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
13c1d189
AE		 2148{
2149 struct xfrm_user_kmaddress uk;
2150
2151 memset(&uk, 0, sizeof(uk));
2152 uk.family = k->family;
2153 uk.reserved = k->reserved;
2154 memcpy(&uk.local, &k->local, sizeof(uk.local));
a1caa322 2155 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
13c1d189
AE		 2156
2157 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2158}
2159
2160static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
7deb2264
TG		 2161{
2162 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
13c1d189
AE		 2163 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2164 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2165 + userpolicy_type_attrsize();
7deb2264
TG		 2166}
2167
183cad12
DM		 2168static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2169 int num_migrate, const struct xfrm_kmaddress *k,
2170 const struct xfrm_selector *sel, u8 dir, u8 type)
5c79de6e 2171{
183cad12 2172 const struct xfrm_migrate *mp;
5c79de6e
SS		 2173 struct xfrm_userpolicy_id *pol_id;
2174 struct nlmsghdr *nlh;
1d1e34dd 2175 int i, err;
5c79de6e 2176
79b8b7f4
TG		 2177 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2178 if (nlh == NULL)
2179 return -EMSGSIZE;
5c79de6e 2180
7b67c857 2181 pol_id = nlmsg_data(nlh);
5c79de6e
SS		 2182 /* copy data from selector, dir, and type to the pol_id */
2183 memset(pol_id, 0, sizeof(*pol_id));
2184 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2185 pol_id->dir = dir;
2186
1d1e34dd
DM		 2187 if (k != NULL) {
2188 err = copy_to_user_kmaddress(k, skb);
2189 if (err)
2190 goto out_cancel;
2191 }
2192 err = copy_to_user_policy_type(type, skb);
2193 if (err)
2194 goto out_cancel;
5c79de6e 2195 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1d1e34dd
DM		 2196 err = copy_to_user_migrate(mp, skb);
2197 if (err)
2198 goto out_cancel;
5c79de6e
SS		 2199 }
2200
9825069d 2201 return nlmsg_end(skb, nlh);
1d1e34dd
DM		 2202
2203out_cancel:
9825069d 2204 nlmsg_cancel(skb, nlh);
1d1e34dd 2205 return err;
5c79de6e
SS		 2206}
2207
183cad12
DM		 2208static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2209 const struct xfrm_migrate *m, int num_migrate,
2210 const struct xfrm_kmaddress *k)
5c79de6e 2211{
a6483b79 2212 struct net *net = &init_net;
5c79de6e 2213 struct sk_buff *skb;
5c79de6e 2214
13c1d189 2215 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
5c79de6e
SS		 2216 if (skb == NULL)
2217 return -ENOMEM;
2218
2219 /* build migrate */
13c1d189 2220 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
5c79de6e
SS		 2221 BUG();
2222
a6483b79 2223 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
5c79de6e
SS		 2224}
2225#else
183cad12
DM		 2226static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2227 const struct xfrm_migrate *m, int num_migrate,
2228 const struct xfrm_kmaddress *k)
5c79de6e
SS		 2229{
2230 return -ENOPROTOOPT;
2231}
2232#endif
d51d081d 2233
a7bd9a45 2234#define XMSGSIZE(type) sizeof(struct type)
492b558b
TG		 2235
2236static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
66f9a259 2237 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
492b558b
TG		 2238 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2239 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2240 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2241 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2242 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2243 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
980ebd25 2244 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
53bc6b4d 2245 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
492b558b 2246 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
66f9a259 2247 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
6c5c8ca7 2248 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
492b558b 2249 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
a7bd9a45 2250 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
d51d081d
JHS		 2251 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2252 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
97a64b45 2253 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
5c79de6e 2254 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
a7bd9a45
TG		 2255 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2256 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1da177e4
LT		 2257};
2258
492b558b
TG		 2259#undef XMSGSIZE
2260
cf5cb79f 2261static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
c28e9304 2262 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2263 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2264 [XFRMA_LASTUSED] = { .type = NLA_U64},
2265 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
1a6509d9 2266 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
cf5cb79f
TG		 2267 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2268 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2269 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2270 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2271 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2272 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2273 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2274 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2275 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2276 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2277 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2278 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2279 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2280 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
13c1d189 2281 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
6f26b61e 2282 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
35d2856b 2283 [XFRMA_TFCPAD] = { .type = NLA_U32 },
d8647b79 2284 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
cf5cb79f
TG		 2285};
2286
1da177e4 2287static struct xfrm_link {
5424f32e 2288 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1da177e4 2289 int (*dump)(struct sk_buff *, struct netlink_callback *);
4c563f76 2290 int (*done)(struct netlink_callback *);
492b558b
TG		 2291} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2292 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2293 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2294 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
4c563f76
TT		 2295 .dump = xfrm_dump_sa,
2296 .done = xfrm_dump_sa_done },
492b558b
TG		 2297 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2298 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2299 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
4c563f76
TT		 2300 .dump = xfrm_dump_policy,
2301 .done = xfrm_dump_policy_done },
492b558b 2302 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
980ebd25 2303 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
53bc6b4d 2304 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
492b558b
TG		 2305 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2306 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
6c5c8ca7 2307 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
492b558b
TG		 2308 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2309 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
d51d081d
JHS		 2310 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2311 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
5c79de6e 2312 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
566ec034 2313 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
ecfd6b18 2314 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1da177e4
LT		 2315};
2316
1d00a4eb 2317static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2318{
a6483b79 2319 struct net *net = sock_net(skb->sk);
35a7aa08 2320 struct nlattr *attrs[XFRMA_MAX+1];
1da177e4 2321 struct xfrm_link *link;
a7bd9a45 2322 int type, err;
1da177e4 2323
1da177e4 2324 type = nlh->nlmsg_type;
1da177e4 2325 if (type > XFRM_MSG_MAX)
1d00a4eb 2326 return -EINVAL;
1da177e4
LT		 2327
2328 type -= XFRM_MSG_BASE;
2329 link = &xfrm_dispatch[type];
2330
2331 /* All operations require privileges, even GET */
fd778461 2332 if (!capable(CAP_NET_ADMIN))
1d00a4eb 2333 return -EPERM;
1da177e4 2334
492b558b
TG		 2335 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2336 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
b8f3ab42 2337 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1da177e4 2338 if (link->dump == NULL)
1d00a4eb 2339 return -EINVAL;
88fc2c84 2340
80d326fa
PNA		 2341 {
2342 struct netlink_dump_control c = {
2343 .dump = link->dump,
2344 .done = link->done,
2345 };
2346 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2347 }
1da177e4
LT		 2348 }
2349
35a7aa08 2350 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
cf5cb79f 2351 xfrma_policy);
a7bd9a45
TG		 2352 if (err < 0)
2353 return err;
1da177e4
LT		 2354
2355 if (link->doit == NULL)
1d00a4eb 2356 return -EINVAL;
1da177e4 2357
5424f32e 2358 return link->doit(skb, nlh, attrs);
1da177e4
LT		 2359}
2360
cd40b7d3 2361static void xfrm_netlink_rcv(struct sk_buff *skb)
1da177e4 2362{
cd40b7d3
DL		 2363 mutex_lock(&xfrm_cfg_mutex);
2364 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2365 mutex_unlock(&xfrm_cfg_mutex);
1da177e4
LT		 2366}
2367
7deb2264
TG		 2368static inline size_t xfrm_expire_msgsize(void)
2369{
6f26b61e
JHS		 2370 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2371 + nla_total_size(sizeof(struct xfrm_mark));
7deb2264
TG		 2372}
2373
214e005b 2374static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1da177e4
LT		 2375{
2376 struct xfrm_user_expire *ue;
2377 struct nlmsghdr *nlh;
1d1e34dd 2378 int err;
1da177e4 2379
79b8b7f4
TG		 2380 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2381 if (nlh == NULL)
2382 return -EMSGSIZE;
1da177e4 2383
7b67c857 2384 ue = nlmsg_data(nlh);
1da177e4 2385 copy_to_user_state(x, &ue->state);
d51d081d 2386 ue->hard = (c->data.hard != 0) ? 1 : 0;
1da177e4 2387
1d1e34dd
DM		 2388 err = xfrm_mark_put(skb, &x->mark);
2389 if (err)
2390 return err;
6f26b61e 2391
9825069d 2392 return nlmsg_end(skb, nlh);
1da177e4
LT		 2393}
2394
214e005b 2395static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
1da177e4 2396{
fc34acd3 2397 struct net *net = xs_net(x);
1da177e4
LT		 2398 struct sk_buff *skb;
2399
7deb2264 2400 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1da177e4
LT		 2401 if (skb == NULL)
2402 return -ENOMEM;
2403
6f26b61e
JHS		 2404 if (build_expire(skb, x, c) < 0) {
2405 kfree_skb(skb);
2406 return -EMSGSIZE;
2407 }
1da177e4 2408
a6483b79 2409 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2410}
2411
214e005b 2412static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
d51d081d 2413{
fc34acd3 2414 struct net *net = xs_net(x);
d51d081d 2415 struct sk_buff *skb;
d51d081d 2416
d8647b79 2417 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
d51d081d
JHS		 2418 if (skb == NULL)
2419 return -ENOMEM;
2420
2421 if (build_aevent(skb, x, c) < 0)
2422 BUG();
2423
a6483b79 2424 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
d51d081d
JHS		 2425}
2426
214e005b 2427static int xfrm_notify_sa_flush(const struct km_event *c)
26b15dad 2428{
7067802e 2429 struct net *net = c->net;
26b15dad
JHS		 2430 struct xfrm_usersa_flush *p;
2431 struct nlmsghdr *nlh;
2432 struct sk_buff *skb;
7deb2264 2433 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
26b15dad 2434
7deb2264 2435 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2436 if (skb == NULL)
2437 return -ENOMEM;
26b15dad 2438
79b8b7f4
TG		 2439 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2440 if (nlh == NULL) {
2441 kfree_skb(skb);
2442 return -EMSGSIZE;
2443 }
26b15dad 2444
7b67c857 2445 p = nlmsg_data(nlh);
bf08867f 2446 p->proto = c->data.proto;
26b15dad 2447
9825069d 2448 nlmsg_end(skb, nlh);
26b15dad 2449
a6483b79 2450 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad
JHS		 2451}
2452
7deb2264 2453static inline size_t xfrm_sa_len(struct xfrm_state *x)
26b15dad 2454{
7deb2264 2455 size_t l = 0;
1a6509d9
HX		 2456 if (x->aead)
2457 l += nla_total_size(aead_len(x->aead));
4447bb33
MW		 2458 if (x->aalg) {
2459 l += nla_total_size(sizeof(struct xfrm_algo) +
2460 (x->aalg->alg_key_len + 7) / 8);
2461 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2462 }
26b15dad 2463 if (x->ealg)
0f99be0d 2464 l += nla_total_size(xfrm_alg_len(x->ealg));
26b15dad 2465 if (x->calg)
7deb2264 2466 l += nla_total_size(sizeof(*x->calg));
26b15dad 2467 if (x->encap)
7deb2264 2468 l += nla_total_size(sizeof(*x->encap));
35d2856b
MW		 2469 if (x->tfcpad)
2470 l += nla_total_size(sizeof(x->tfcpad));
d8647b79
SK		 2471 if (x->replay_esn)
2472 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
68325d3b
HX		 2473 if (x->security)
2474 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2475 x->security->ctx_len);
2476 if (x->coaddr)
2477 l += nla_total_size(sizeof(*x->coaddr));
2478
d26f3984
HX		 2479 /* Must count x->lastused as it may become non-zero behind our back. */
2480 l += nla_total_size(sizeof(u64));
26b15dad
JHS		 2481
2482 return l;
2483}
2484
214e005b 2485static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
26b15dad 2486{
fc34acd3 2487 struct net *net = xs_net(x);
26b15dad 2488 struct xfrm_usersa_info *p;
0603eac0 2489 struct xfrm_usersa_id *id;
26b15dad
JHS		 2490 struct nlmsghdr *nlh;
2491 struct sk_buff *skb;
26b15dad 2492 int len = xfrm_sa_len(x);
1d1e34dd 2493 int headlen, err;
0603eac0
HX		 2494
2495 headlen = sizeof(*p);
2496 if (c->event == XFRM_MSG_DELSA) {
7deb2264 2497 len += nla_total_size(headlen);
0603eac0 2498 headlen = sizeof(*id);
6f26b61e 2499 len += nla_total_size(sizeof(struct xfrm_mark));
0603eac0 2500 }
7deb2264 2501 len += NLMSG_ALIGN(headlen);
26b15dad 2502
7deb2264 2503 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2504 if (skb == NULL)
2505 return -ENOMEM;
26b15dad 2506
79b8b7f4 2507 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
1d1e34dd 2508 err = -EMSGSIZE;
79b8b7f4 2509 if (nlh == NULL)
1d1e34dd 2510 goto out_free_skb;
26b15dad 2511
7b67c857 2512 p = nlmsg_data(nlh);
0603eac0 2513 if (c->event == XFRM_MSG_DELSA) {
c0144bea
TG		 2514 struct nlattr *attr;
2515
7b67c857 2516 id = nlmsg_data(nlh);
0603eac0
HX		 2517 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2518 id->spi = x->id.spi;
2519 id->family = x->props.family;
2520 id->proto = x->id.proto;
2521
c0144bea 2522 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
1d1e34dd 2523 err = -EMSGSIZE;
c0144bea 2524 if (attr == NULL)
1d1e34dd 2525 goto out_free_skb;
c0144bea
TG		 2526
2527 p = nla_data(attr);
0603eac0 2528 }
1d1e34dd
DM		 2529 err = copy_to_user_state_extra(x, p, skb);
2530 if (err)
2531 goto out_free_skb;
26b15dad 2532
9825069d 2533 nlmsg_end(skb, nlh);
26b15dad 2534
a6483b79 2535 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
26b15dad 2536
1d1e34dd 2537out_free_skb:
26b15dad 2538 kfree_skb(skb);
1d1e34dd 2539 return err;
26b15dad
JHS		 2540}
2541
214e005b 2542static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
26b15dad
JHS		 2543{
2544
2545 switch (c->event) {
f60f6b8f 2546 case XFRM_MSG_EXPIRE:
26b15dad 2547 return xfrm_exp_state_notify(x, c);
d51d081d
JHS		 2548 case XFRM_MSG_NEWAE:
2549 return xfrm_aevent_state_notify(x, c);
f60f6b8f
HX		 2550 case XFRM_MSG_DELSA:
2551 case XFRM_MSG_UPDSA:
2552 case XFRM_MSG_NEWSA:
26b15dad 2553 return xfrm_notify_sa(x, c);
f60f6b8f 2554 case XFRM_MSG_FLUSHSA:
26b15dad
JHS		 2555 return xfrm_notify_sa_flush(c);
2556 default:
62db5cfd 2557 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2558 c->event);
2559 break;
26b15dad
JHS		 2560 }
2561
2562 return 0;
2563
2564}
2565
7deb2264
TG		 2566static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2567 struct xfrm_policy *xp)
2568{
2569 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2570 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
6f26b61e 2571 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2572 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2573 + userpolicy_type_attrsize();
2574}
2575
1da177e4
LT		 2576static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2577 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2578 int dir)
2579{
1d1e34dd 2580 __u32 seq = xfrm_get_acqseq();
1da177e4
LT		 2581 struct xfrm_user_acquire *ua;
2582 struct nlmsghdr *nlh;
1d1e34dd 2583 int err;
1da177e4 2584
79b8b7f4
TG		 2585 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2586 if (nlh == NULL)
2587 return -EMSGSIZE;
1da177e4 2588
7b67c857 2589 ua = nlmsg_data(nlh);
1da177e4
LT		 2590 memcpy(&ua->id, &x->id, sizeof(ua->id));
2591 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2592 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2593 copy_to_user_policy(xp, &ua->policy, dir);
2594 ua->aalgos = xt->aalgos;
2595 ua->ealgos = xt->ealgos;
2596 ua->calgos = xt->calgos;
2597 ua->seq = x->km.seq = seq;
2598
1d1e34dd
DM		 2599 err = copy_to_user_tmpl(xp, skb);
2600 if (!err)
2601 err = copy_to_user_state_sec_ctx(x, skb);
2602 if (!err)
2603 err = copy_to_user_policy_type(xp->type, skb);
2604 if (!err)
2605 err = xfrm_mark_put(skb, &xp->mark);
2606 if (err) {
2607 nlmsg_cancel(skb, nlh);
2608 return err;
2609 }
1da177e4 2610
9825069d 2611 return nlmsg_end(skb, nlh);
1da177e4
LT		 2612}
2613
2614static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2615 struct xfrm_policy *xp, int dir)
2616{
a6483b79 2617 struct net *net = xs_net(x);
1da177e4 2618 struct sk_buff *skb;
1da177e4 2619
7deb2264 2620 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
1da177e4
LT		 2621 if (skb == NULL)
2622 return -ENOMEM;
2623
2624 if (build_acquire(skb, x, xt, xp, dir) < 0)
2625 BUG();
2626
a6483b79 2627 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
1da177e4
LT		 2628}
2629
2630/* User gives us xfrm_user_policy_info followed by an array of 0
2631 * or more templates.
2632 */
cb969f07 2633static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
1da177e4
LT		 2634 u8 *data, int len, int *dir)
2635{
fc34acd3 2636 struct net *net = sock_net(sk);
1da177e4
LT		 2637 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2638 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2639 struct xfrm_policy *xp;
2640 int nr;
2641
cb969f07 2642 switch (sk->sk_family) {
1da177e4
LT		 2643 case AF_INET:
2644 if (opt != IP_XFRM_POLICY) {
2645 *dir = -EOPNOTSUPP;
2646 return NULL;
2647 }
2648 break;
dfd56b8b 2649#if IS_ENABLED(CONFIG_IPV6)
1da177e4
LT		 2650 case AF_INET6:
2651 if (opt != IPV6_XFRM_POLICY) {
2652 *dir = -EOPNOTSUPP;
2653 return NULL;
2654 }
2655 break;
2656#endif
2657 default:
2658 *dir = -EINVAL;
2659 return NULL;
2660 }
2661
2662 *dir = -EINVAL;
2663
2664 if (len < sizeof(*p) ||
2665 verify_newpolicy_info(p))
2666 return NULL;
2667
2668 nr = ((len - sizeof(*p)) / sizeof(*ut));
b4ad86bf 2669 if (validate_tmpl(nr, ut, p->sel.family))
1da177e4
LT		 2670 return NULL;
2671
a4f1bac6
HX		 2672 if (p->dir > XFRM_POLICY_OUT)
2673 return NULL;
2674
2f09a4d5 2675 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
1da177e4
LT		 2676 if (xp == NULL) {
2677 *dir = -ENOBUFS;
2678 return NULL;
2679 }
2680
2681 copy_from_user_policy(xp, p);
f7b6983f 2682 xp->type = XFRM_POLICY_TYPE_MAIN;
1da177e4
LT		 2683 copy_templates(xp, ut, nr);
2684
2685 *dir = p->dir;
2686
2687 return xp;
2688}
2689
7deb2264
TG		 2690static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2691{
2692 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2693 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2694 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
295fae56 2695 + nla_total_size(sizeof(struct xfrm_mark))
7deb2264
TG		 2696 + userpolicy_type_attrsize();
2697}
2698
1da177e4 2699static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
214e005b 2700 int dir, const struct km_event *c)
1da177e4
LT		 2701{
2702 struct xfrm_user_polexpire *upe;
d51d081d 2703 int hard = c->data.hard;
1d1e34dd
DM		 2704 struct nlmsghdr *nlh;
2705 int err;
1da177e4 2706
79b8b7f4
TG		 2707 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2708 if (nlh == NULL)
2709 return -EMSGSIZE;
1da177e4 2710
7b67c857 2711 upe = nlmsg_data(nlh);
1da177e4 2712 copy_to_user_policy(xp, &upe->pol, dir);
1d1e34dd
DM		 2713 err = copy_to_user_tmpl(xp, skb);
2714 if (!err)
2715 err = copy_to_user_sec_ctx(xp, skb);
2716 if (!err)
2717 err = copy_to_user_policy_type(xp->type, skb);
2718 if (!err)
2719 err = xfrm_mark_put(skb, &xp->mark);
2720 if (err) {
2721 nlmsg_cancel(skb, nlh);
2722 return err;
2723 }
1da177e4
LT		 2724 upe->hard = !!hard;
2725
9825069d 2726 return nlmsg_end(skb, nlh);
1da177e4
LT		 2727}
2728
214e005b 2729static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1da177e4 2730{
fc34acd3 2731 struct net *net = xp_net(xp);
1da177e4 2732 struct sk_buff *skb;
1da177e4 2733
7deb2264 2734 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
1da177e4
LT		 2735 if (skb == NULL)
2736 return -ENOMEM;
2737
d51d081d 2738 if (build_polexpire(skb, xp, dir, c) < 0)
1da177e4
LT		 2739 BUG();
2740
a6483b79 2741 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1da177e4
LT		 2742}
2743
214e005b 2744static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad 2745{
1d1e34dd 2746 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
fc34acd3 2747 struct net *net = xp_net(xp);
26b15dad 2748 struct xfrm_userpolicy_info *p;
0603eac0 2749 struct xfrm_userpolicy_id *id;
26b15dad
JHS		 2750 struct nlmsghdr *nlh;
2751 struct sk_buff *skb;
1d1e34dd 2752 int headlen, err;
0603eac0
HX		 2753
2754 headlen = sizeof(*p);
2755 if (c->event == XFRM_MSG_DELPOLICY) {
7deb2264 2756 len += nla_total_size(headlen);
0603eac0
HX		 2757 headlen = sizeof(*id);
2758 }
cfbfd45a 2759 len += userpolicy_type_attrsize();
295fae56 2760 len += nla_total_size(sizeof(struct xfrm_mark));
7deb2264 2761 len += NLMSG_ALIGN(headlen);
26b15dad 2762
7deb2264 2763 skb = nlmsg_new(len, GFP_ATOMIC);
26b15dad
JHS		 2764 if (skb == NULL)
2765 return -ENOMEM;
26b15dad 2766
79b8b7f4 2767 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
1d1e34dd 2768 err = -EMSGSIZE;
79b8b7f4 2769 if (nlh == NULL)
1d1e34dd 2770 goto out_free_skb;
26b15dad 2771
7b67c857 2772 p = nlmsg_data(nlh);
0603eac0 2773 if (c->event == XFRM_MSG_DELPOLICY) {
c0144bea
TG		 2774 struct nlattr *attr;
2775
7b67c857 2776 id = nlmsg_data(nlh);
0603eac0
HX		 2777 memset(id, 0, sizeof(*id));
2778 id->dir = dir;
2779 if (c->data.byid)
2780 id->index = xp->index;
2781 else
2782 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2783
c0144bea 2784 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
1d1e34dd 2785 err = -EMSGSIZE;
c0144bea 2786 if (attr == NULL)
1d1e34dd 2787 goto out_free_skb;
c0144bea
TG		 2788
2789 p = nla_data(attr);
0603eac0 2790 }
26b15dad 2791
26b15dad 2792 copy_to_user_policy(xp, p, dir);
1d1e34dd
DM		 2793 err = copy_to_user_tmpl(xp, skb);
2794 if (!err)
2795 err = copy_to_user_policy_type(xp->type, skb);
2796 if (!err)
2797 err = xfrm_mark_put(skb, &xp->mark);
2798 if (err)
2799 goto out_free_skb;
295fae56 2800
9825069d 2801 nlmsg_end(skb, nlh);
26b15dad 2802
a6483b79 2803 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2804
1d1e34dd 2805out_free_skb:
26b15dad 2806 kfree_skb(skb);
1d1e34dd 2807 return err;
26b15dad
JHS		 2808}
2809
214e005b 2810static int xfrm_notify_policy_flush(const struct km_event *c)
26b15dad 2811{
7067802e 2812 struct net *net = c->net;
26b15dad
JHS		 2813 struct nlmsghdr *nlh;
2814 struct sk_buff *skb;
1d1e34dd 2815 int err;
26b15dad 2816
7deb2264 2817 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
26b15dad
JHS		 2818 if (skb == NULL)
2819 return -ENOMEM;
26b15dad 2820
79b8b7f4 2821 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
1d1e34dd 2822 err = -EMSGSIZE;
79b8b7f4 2823 if (nlh == NULL)
1d1e34dd
DM		 2824 goto out_free_skb;
2825 err = copy_to_user_policy_type(c->data.type, skb);
2826 if (err)
2827 goto out_free_skb;
26b15dad 2828
9825069d 2829 nlmsg_end(skb, nlh);
26b15dad 2830
a6483b79 2831 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
26b15dad 2832
1d1e34dd 2833out_free_skb:
26b15dad 2834 kfree_skb(skb);
1d1e34dd 2835 return err;
26b15dad
JHS		 2836}
2837
214e005b 2838static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
26b15dad
JHS		 2839{
2840
2841 switch (c->event) {
f60f6b8f
HX		 2842 case XFRM_MSG_NEWPOLICY:
2843 case XFRM_MSG_UPDPOLICY:
2844 case XFRM_MSG_DELPOLICY:
26b15dad 2845 return xfrm_notify_policy(xp, dir, c);
f60f6b8f 2846 case XFRM_MSG_FLUSHPOLICY:
26b15dad 2847 return xfrm_notify_policy_flush(c);
f60f6b8f 2848 case XFRM_MSG_POLEXPIRE:
26b15dad
JHS		 2849 return xfrm_exp_policy_notify(xp, dir, c);
2850 default:
62db5cfd 2851 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2852 c->event);
26b15dad
JHS		 2853 }
2854
2855 return 0;
2856
2857}
2858
7deb2264
TG		 2859static inline size_t xfrm_report_msgsize(void)
2860{
2861 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2862}
2863
97a64b45
MN		 2864static int build_report(struct sk_buff *skb, u8 proto,
2865 struct xfrm_selector *sel, xfrm_address_t *addr)
2866{
2867 struct xfrm_user_report *ur;
2868 struct nlmsghdr *nlh;
97a64b45 2869
79b8b7f4
TG		 2870 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2871 if (nlh == NULL)
2872 return -EMSGSIZE;
97a64b45 2873
7b67c857 2874 ur = nlmsg_data(nlh);
97a64b45
MN		 2875 ur->proto = proto;
2876 memcpy(&ur->sel, sel, sizeof(ur->sel));
2877
1d1e34dd
DM		 2878 if (addr) {
2879 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2880 if (err) {
2881 nlmsg_cancel(skb, nlh);
2882 return err;
2883 }
2884 }
9825069d 2885 return nlmsg_end(skb, nlh);
97a64b45
MN		 2886}
2887
db983c11
AD		 2888static int xfrm_send_report(struct net *net, u8 proto,
2889 struct xfrm_selector *sel, xfrm_address_t *addr)
97a64b45
MN		 2890{
2891 struct sk_buff *skb;
97a64b45 2892
7deb2264 2893 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
97a64b45
MN		 2894 if (skb == NULL)
2895 return -ENOMEM;
2896
2897 if (build_report(skb, proto, sel, addr) < 0)
2898 BUG();
2899
a6483b79 2900 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
97a64b45
MN		 2901}
2902
3a2dfbe8
MW		 2903static inline size_t xfrm_mapping_msgsize(void)
2904{
2905 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2906}
2907
2908static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2909 xfrm_address_t *new_saddr, __be16 new_sport)
2910{
2911 struct xfrm_user_mapping *um;
2912 struct nlmsghdr *nlh;
2913
2914 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2915 if (nlh == NULL)
2916 return -EMSGSIZE;
2917
2918 um = nlmsg_data(nlh);
2919
2920 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2921 um->id.spi = x->id.spi;
2922 um->id.family = x->props.family;
2923 um->id.proto = x->id.proto;
2924 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2925 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2926 um->new_sport = new_sport;
2927 um->old_sport = x->encap->encap_sport;
2928 um->reqid = x->props.reqid;
2929
2930 return nlmsg_end(skb, nlh);
2931}
2932
2933static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2934 __be16 sport)
2935{
a6483b79 2936 struct net *net = xs_net(x);
3a2dfbe8
MW		 2937 struct sk_buff *skb;
2938
2939 if (x->id.proto != IPPROTO_ESP)
2940 return -EINVAL;
2941
2942 if (!x->encap)
2943 return -EINVAL;
2944
2945 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2946 if (skb == NULL)
2947 return -ENOMEM;
2948
2949 if (build_mapping(skb, x, ipaddr, sport) < 0)
2950 BUG();
2951
a6483b79 2952 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
3a2dfbe8
MW		 2953}
2954
1da177e4
LT		 2955static struct xfrm_mgr netlink_mgr = {
2956 .id = "netlink",
2957 .notify = xfrm_send_state_notify,
2958 .acquire = xfrm_send_acquire,
2959 .compile_policy = xfrm_compile_policy,
2960 .notify_policy = xfrm_send_policy_notify,
97a64b45 2961 .report = xfrm_send_report,
5c79de6e 2962 .migrate = xfrm_send_migrate,
3a2dfbe8 2963 .new_mapping = xfrm_send_mapping,
1da177e4
LT		 2964};
2965
a6483b79 2966static int __net_init xfrm_user_net_init(struct net *net)
1da177e4 2967{
be33690d 2968 struct sock *nlsk;
a31f2d17
PNA		 2969 struct netlink_kernel_cfg cfg = {
2970 .groups = XFRMNLGRP_MAX,
2971 .input = xfrm_netlink_rcv,
2972 };
be33690d 2973
a31f2d17 2974 nlsk = netlink_kernel_create(net, NETLINK_XFRM, THIS_MODULE, &cfg);
be33690d 2975 if (nlsk == NULL)
1da177e4 2976 return -ENOMEM;
d79d792e 2977 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
cf778b00 2978 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
1da177e4
LT		 2979 return 0;
2980}
2981
d79d792e 2982static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
1da177e4 2983{
d79d792e
EB		 2984 struct net *net;
2985 list_for_each_entry(net, net_exit_list, exit_list)
a9b3cd7f 2986 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
d79d792e
EB		 2987 synchronize_net();
2988 list_for_each_entry(net, net_exit_list, exit_list)
2989 netlink_kernel_release(net->xfrm.nlsk_stash);
1da177e4
LT		 2990}
2991
a6483b79 2992static struct pernet_operations xfrm_user_net_ops = {
d79d792e
EB		 2993 .init = xfrm_user_net_init,
2994 .exit_batch = xfrm_user_net_exit,
a6483b79
AD		 2995};
2996
2997static int __init xfrm_user_init(void)
2998{
2999 int rv;
3000
3001 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3002
3003 rv = register_pernet_subsys(&xfrm_user_net_ops);
3004 if (rv < 0)
3005 return rv;
3006 rv = xfrm_register_km(&netlink_mgr);
3007 if (rv < 0)
3008 unregister_pernet_subsys(&xfrm_user_net_ops);
3009 return rv;
3010}
3011
3012static void __exit xfrm_user_exit(void)
3013{
3014 xfrm_unregister_km(&netlink_mgr);
3015 unregister_pernet_subsys(&xfrm_user_net_ops);
3016}
3017
1da177e4
LT		 3018module_init(xfrm_user_init);
3019module_exit(xfrm_user_exit);
3020MODULE_LICENSE("GPL");
4fdb3bb7 3021MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
f8cd5488 3022
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