1 // SPDX-License-Identifier: GPL-2.0-only
2 /* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
14 #include <linux/crypto.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/socket.h>
20 #include <linux/string.h>
21 #include <linux/net.h>
22 #include <linux/skbuff.h>
23 #include <linux/pfkeyv2.h>
24 #include <linux/ipsec.h>
25 #include <linux/init.h>
26 #include <linux/security.h>
27 #include <net/sock.h>
28 #include <net/xfrm.h>
29 #include <net/netlink.h>
30 #include <net/ah.h>
31 #include <linux/uaccess.h>
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <linux/in6.h>
34 #endif
35 #include <asm/unaligned.h>
36
verify_one_alg(struct nlattr ** attrs,enum xfrm_attr_type_t type)37 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
38 {
39 struct nlattr *rt = attrs[type];
40 struct xfrm_algo *algp;
41
42 if (!rt)
43 return 0;
44
45 algp = nla_data(rt);
46 if (nla_len(rt) < (int)xfrm_alg_len(algp))
47 return -EINVAL;
48
49 switch (type) {
50 case XFRMA_ALG_AUTH:
51 case XFRMA_ALG_CRYPT:
52 case XFRMA_ALG_COMP:
53 break;
54
55 default:
56 return -EINVAL;
57 }
58
59 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
60 return 0;
61 }
62
verify_auth_trunc(struct nlattr ** attrs)63 static int verify_auth_trunc(struct nlattr **attrs)
64 {
65 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
66 struct xfrm_algo_auth *algp;
67
68 if (!rt)
69 return 0;
70
71 algp = nla_data(rt);
72 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
73 return -EINVAL;
74
75 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
76 return 0;
77 }
78
verify_aead(struct nlattr ** attrs)79 static int verify_aead(struct nlattr **attrs)
80 {
81 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
82 struct xfrm_algo_aead *algp;
83
84 if (!rt)
85 return 0;
86
87 algp = nla_data(rt);
88 if (nla_len(rt) < (int)aead_len(algp))
89 return -EINVAL;
90
91 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
92 return 0;
93 }
94
verify_one_addr(struct nlattr ** attrs,enum xfrm_attr_type_t type,xfrm_address_t ** addrp)95 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
96 xfrm_address_t **addrp)
97 {
98 struct nlattr *rt = attrs[type];
99
100 if (rt && addrp)
101 *addrp = nla_data(rt);
102 }
103
verify_sec_ctx_len(struct nlattr ** attrs)104 static inline int verify_sec_ctx_len(struct nlattr **attrs)
105 {
106 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
107 struct xfrm_user_sec_ctx *uctx;
108
109 if (!rt)
110 return 0;
111
112 uctx = nla_data(rt);
113 if (uctx->len > nla_len(rt) ||
114 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
115 return -EINVAL;
116
117 return 0;
118 }
119
verify_replay(struct xfrm_usersa_info * p,struct nlattr ** attrs)120 static inline int verify_replay(struct xfrm_usersa_info *p,
121 struct nlattr **attrs)
122 {
123 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
124 struct xfrm_replay_state_esn *rs;
125
126 if (!rt)
127 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
128
129 rs = nla_data(rt);
130
131 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
132 return -EINVAL;
133
134 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
135 nla_len(rt) != sizeof(*rs))
136 return -EINVAL;
137
138 /* As only ESP and AH support ESN feature. */
139 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
140 return -EINVAL;
141
142 if (p->replay_window != 0)
143 return -EINVAL;
144
145 return 0;
146 }
147
verify_newsa_info(struct xfrm_usersa_info * p,struct nlattr ** attrs)148 static int verify_newsa_info(struct xfrm_usersa_info *p,
149 struct nlattr **attrs)
150 {
151 int err;
152
153 err = -EINVAL;
154 switch (p->family) {
155 case AF_INET:
156 break;
157
158 case AF_INET6:
159 #if IS_ENABLED(CONFIG_IPV6)
160 break;
161 #else
162 err = -EAFNOSUPPORT;
163 goto out;
164 #endif
165
166 default:
167 goto out;
168 }
169
170 switch (p->sel.family) {
171 case AF_UNSPEC:
172 break;
173
174 case AF_INET:
175 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
176 goto out;
177
178 break;
179
180 case AF_INET6:
181 #if IS_ENABLED(CONFIG_IPV6)
182 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
183 goto out;
184
185 break;
186 #else
187 err = -EAFNOSUPPORT;
188 goto out;
189 #endif
190
191 default:
192 goto out;
193 }
194
195 err = -EINVAL;
196 switch (p->id.proto) {
197 case IPPROTO_AH:
198 if ((!attrs[XFRMA_ALG_AUTH] &&
199 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
200 attrs[XFRMA_ALG_AEAD] ||
201 attrs[XFRMA_ALG_CRYPT] ||
202 attrs[XFRMA_ALG_COMP] ||
203 attrs[XFRMA_TFCPAD])
204 goto out;
205 break;
206
207 case IPPROTO_ESP:
208 if (attrs[XFRMA_ALG_COMP])
209 goto out;
210 if (!attrs[XFRMA_ALG_AUTH] &&
211 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
212 !attrs[XFRMA_ALG_CRYPT] &&
213 !attrs[XFRMA_ALG_AEAD])
214 goto out;
215 if ((attrs[XFRMA_ALG_AUTH] ||
216 attrs[XFRMA_ALG_AUTH_TRUNC] ||
217 attrs[XFRMA_ALG_CRYPT]) &&
218 attrs[XFRMA_ALG_AEAD])
219 goto out;
220 if (attrs[XFRMA_TFCPAD] &&
221 p->mode != XFRM_MODE_TUNNEL)
222 goto out;
223 break;
224
225 case IPPROTO_COMP:
226 if (!attrs[XFRMA_ALG_COMP] ||
227 attrs[XFRMA_ALG_AEAD] ||
228 attrs[XFRMA_ALG_AUTH] ||
229 attrs[XFRMA_ALG_AUTH_TRUNC] ||
230 attrs[XFRMA_ALG_CRYPT] ||
231 attrs[XFRMA_TFCPAD] ||
232 (ntohl(p->id.spi) >= 0x10000))
233 goto out;
234 break;
235
236 #if IS_ENABLED(CONFIG_IPV6)
237 case IPPROTO_DSTOPTS:
238 case IPPROTO_ROUTING:
239 if (attrs[XFRMA_ALG_COMP] ||
240 attrs[XFRMA_ALG_AUTH] ||
241 attrs[XFRMA_ALG_AUTH_TRUNC] ||
242 attrs[XFRMA_ALG_AEAD] ||
243 attrs[XFRMA_ALG_CRYPT] ||
244 attrs[XFRMA_ENCAP] ||
245 attrs[XFRMA_SEC_CTX] ||
246 attrs[XFRMA_TFCPAD] ||
247 !attrs[XFRMA_COADDR])
248 goto out;
249 break;
250 #endif
251
252 default:
253 goto out;
254 }
255
256 if ((err = verify_aead(attrs)))
257 goto out;
258 if ((err = verify_auth_trunc(attrs)))
259 goto out;
260 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
261 goto out;
262 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
263 goto out;
264 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
265 goto out;
266 if ((err = verify_sec_ctx_len(attrs)))
267 goto out;
268 if ((err = verify_replay(p, attrs)))
269 goto out;
270
271 err = -EINVAL;
272 switch (p->mode) {
273 case XFRM_MODE_TRANSPORT:
274 case XFRM_MODE_TUNNEL:
275 case XFRM_MODE_ROUTEOPTIMIZATION:
276 case XFRM_MODE_BEET:
277 break;
278
279 default:
280 goto out;
281 }
282
283 err = 0;
284
285 out:
286 return err;
287 }
288
attach_one_algo(struct xfrm_algo ** algpp,u8 * props,struct xfrm_algo_desc * (* get_byname)(const char *,int),struct nlattr * rta)289 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
290 struct xfrm_algo_desc *(*get_byname)(const char *, int),
291 struct nlattr *rta)
292 {
293 struct xfrm_algo *p, *ualg;
294 struct xfrm_algo_desc *algo;
295
296 if (!rta)
297 return 0;
298
299 ualg = nla_data(rta);
300
301 algo = get_byname(ualg->alg_name, 1);
302 if (!algo)
303 return -ENOSYS;
304 *props = algo->desc.sadb_alg_id;
305
306 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
307 if (!p)
308 return -ENOMEM;
309
310 strcpy(p->alg_name, algo->name);
311 *algpp = p;
312 return 0;
313 }
314
attach_crypt(struct xfrm_state * x,struct nlattr * rta)315 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
316 {
317 struct xfrm_algo *p, *ualg;
318 struct xfrm_algo_desc *algo;
319
320 if (!rta)
321 return 0;
322
323 ualg = nla_data(rta);
324
325 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
326 if (!algo)
327 return -ENOSYS;
328 x->props.ealgo = algo->desc.sadb_alg_id;
329
330 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
331 if (!p)
332 return -ENOMEM;
333
334 strcpy(p->alg_name, algo->name);
335 x->ealg = p;
336 x->geniv = algo->uinfo.encr.geniv;
337 return 0;
338 }
339
attach_auth(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta)340 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
341 struct nlattr *rta)
342 {
343 struct xfrm_algo *ualg;
344 struct xfrm_algo_auth *p;
345 struct xfrm_algo_desc *algo;
346
347 if (!rta)
348 return 0;
349
350 ualg = nla_data(rta);
351
352 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
353 if (!algo)
354 return -ENOSYS;
355 *props = algo->desc.sadb_alg_id;
356
357 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
358 if (!p)
359 return -ENOMEM;
360
361 strcpy(p->alg_name, algo->name);
362 p->alg_key_len = ualg->alg_key_len;
363 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
364 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
365
366 *algpp = p;
367 return 0;
368 }
369
attach_auth_trunc(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta)370 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
371 struct nlattr *rta)
372 {
373 struct xfrm_algo_auth *p, *ualg;
374 struct xfrm_algo_desc *algo;
375
376 if (!rta)
377 return 0;
378
379 ualg = nla_data(rta);
380
381 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
382 if (!algo)
383 return -ENOSYS;
384 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
385 return -EINVAL;
386 *props = algo->desc.sadb_alg_id;
387
388 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
389 if (!p)
390 return -ENOMEM;
391
392 strcpy(p->alg_name, algo->name);
393 if (!p->alg_trunc_len)
394 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
395
396 *algpp = p;
397 return 0;
398 }
399
attach_aead(struct xfrm_state * x,struct nlattr * rta)400 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
401 {
402 struct xfrm_algo_aead *p, *ualg;
403 struct xfrm_algo_desc *algo;
404
405 if (!rta)
406 return 0;
407
408 ualg = nla_data(rta);
409
410 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
411 if (!algo)
412 return -ENOSYS;
413 x->props.ealgo = algo->desc.sadb_alg_id;
414
415 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
416 if (!p)
417 return -ENOMEM;
418
419 strcpy(p->alg_name, algo->name);
420 x->aead = p;
421 x->geniv = algo->uinfo.aead.geniv;
422 return 0;
423 }
424
xfrm_replay_verify_len(struct xfrm_replay_state_esn * replay_esn,struct nlattr * rp)425 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
426 struct nlattr *rp)
427 {
428 struct xfrm_replay_state_esn *up;
429 unsigned int ulen;
430
431 if (!replay_esn || !rp)
432 return 0;
433
434 up = nla_data(rp);
435 ulen = xfrm_replay_state_esn_len(up);
436
437 /* Check the overall length and the internal bitmap length to avoid
438 * potential overflow. */
439 if (nla_len(rp) < (int)ulen ||
440 xfrm_replay_state_esn_len(replay_esn) != ulen ||
441 replay_esn->bmp_len != up->bmp_len)
442 return -EINVAL;
443
444 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
445 return -EINVAL;
446
447 return 0;
448 }
449
xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn ** replay_esn,struct xfrm_replay_state_esn ** preplay_esn,struct nlattr * rta)450 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
451 struct xfrm_replay_state_esn **preplay_esn,
452 struct nlattr *rta)
453 {
454 struct xfrm_replay_state_esn *p, *pp, *up;
455 unsigned int klen, ulen;
456
457 if (!rta)
458 return 0;
459
460 up = nla_data(rta);
461 klen = xfrm_replay_state_esn_len(up);
462 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
463
464 p = kzalloc(klen, GFP_KERNEL);
465 if (!p)
466 return -ENOMEM;
467
468 pp = kzalloc(klen, GFP_KERNEL);
469 if (!pp) {
470 kfree(p);
471 return -ENOMEM;
472 }
473
474 memcpy(p, up, ulen);
475 memcpy(pp, up, ulen);
476
477 *replay_esn = p;
478 *preplay_esn = pp;
479
480 return 0;
481 }
482
xfrm_user_sec_ctx_size(struct xfrm_sec_ctx * xfrm_ctx)483 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
484 {
485 unsigned int len = 0;
486
487 if (xfrm_ctx) {
488 len += sizeof(struct xfrm_user_sec_ctx);
489 len += xfrm_ctx->ctx_len;
490 }
491 return len;
492 }
493
copy_from_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)494 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
495 {
496 memcpy(&x->id, &p->id, sizeof(x->id));
497 memcpy(&x->sel, &p->sel, sizeof(x->sel));
498 memcpy(&x->lft, &p->lft, sizeof(x->lft));
499 x->props.mode = p->mode;
500 x->props.replay_window = min_t(unsigned int, p->replay_window,
501 sizeof(x->replay.bitmap) * 8);
502 x->props.reqid = p->reqid;
503 x->props.family = p->family;
504 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
505 x->props.flags = p->flags;
506
507 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
508 x->sel.family = p->family;
509 }
510
511 /*
512 * someday when pfkey also has support, we could have the code
513 * somehow made shareable and move it to xfrm_state.c - JHS
514 *
515 */
xfrm_update_ae_params(struct xfrm_state * x,struct nlattr ** attrs,int update_esn)516 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
517 int update_esn)
518 {
519 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
520 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
521 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
522 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
523 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
524
525 if (re) {
526 struct xfrm_replay_state_esn *replay_esn;
527 replay_esn = nla_data(re);
528 memcpy(x->replay_esn, replay_esn,
529 xfrm_replay_state_esn_len(replay_esn));
530 memcpy(x->preplay_esn, replay_esn,
531 xfrm_replay_state_esn_len(replay_esn));
532 }
533
534 if (rp) {
535 struct xfrm_replay_state *replay;
536 replay = nla_data(rp);
537 memcpy(&x->replay, replay, sizeof(*replay));
538 memcpy(&x->preplay, replay, sizeof(*replay));
539 }
540
541 if (lt) {
542 struct xfrm_lifetime_cur *ltime;
543 ltime = nla_data(lt);
544 x->curlft.bytes = ltime->bytes;
545 x->curlft.packets = ltime->packets;
546 x->curlft.add_time = ltime->add_time;
547 x->curlft.use_time = ltime->use_time;
548 }
549
550 if (et)
551 x->replay_maxage = nla_get_u32(et);
552
553 if (rt)
554 x->replay_maxdiff = nla_get_u32(rt);
555 }
556
xfrm_smark_init(struct nlattr ** attrs,struct xfrm_mark * m)557 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
558 {
559 if (attrs[XFRMA_SET_MARK]) {
560 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
561 if (attrs[XFRMA_SET_MARK_MASK])
562 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
563 else
564 m->m = 0xffffffff;
565 } else {
566 m->v = m->m = 0;
567 }
568 }
569
xfrm_state_construct(struct net * net,struct xfrm_usersa_info * p,struct nlattr ** attrs,int * errp)570 static struct xfrm_state *xfrm_state_construct(struct net *net,
571 struct xfrm_usersa_info *p,
572 struct nlattr **attrs,
573 int *errp)
574 {
575 struct xfrm_state *x = xfrm_state_alloc(net);
576 int err = -ENOMEM;
577
578 if (!x)
579 goto error_no_put;
580
581 copy_from_user_state(x, p);
582
583 if (attrs[XFRMA_SA_EXTRA_FLAGS])
584 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
585
586 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
587 goto error;
588 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
589 attrs[XFRMA_ALG_AUTH_TRUNC])))
590 goto error;
591 if (!x->props.aalgo) {
592 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
593 attrs[XFRMA_ALG_AUTH])))
594 goto error;
595 }
596 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
597 goto error;
598 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
599 xfrm_calg_get_byname,
600 attrs[XFRMA_ALG_COMP])))
601 goto error;
602
603 if (attrs[XFRMA_ENCAP]) {
604 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
605 sizeof(*x->encap), GFP_KERNEL);
606 if (x->encap == NULL)
607 goto error;
608 }
609
610 if (attrs[XFRMA_TFCPAD])
611 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
612
613 if (attrs[XFRMA_COADDR]) {
614 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
615 sizeof(*x->coaddr), GFP_KERNEL);
616 if (x->coaddr == NULL)
617 goto error;
618 }
619
620 xfrm_mark_get(attrs, &x->mark);
621
622 xfrm_smark_init(attrs, &x->props.smark);
623
624 if (attrs[XFRMA_IF_ID])
625 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
626
627 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
628 if (err)
629 goto error;
630
631 if (attrs[XFRMA_SEC_CTX]) {
632 err = security_xfrm_state_alloc(x,
633 nla_data(attrs[XFRMA_SEC_CTX]));
634 if (err)
635 goto error;
636 }
637
638 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
639 attrs[XFRMA_REPLAY_ESN_VAL])))
640 goto error;
641
642 x->km.seq = p->seq;
643 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
644 /* sysctl_xfrm_aevent_etime is in 100ms units */
645 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
646
647 if ((err = xfrm_init_replay(x)))
648 goto error;
649
650 /* override default values from above */
651 xfrm_update_ae_params(x, attrs, 0);
652
653 /* configure the hardware if offload is requested */
654 if (attrs[XFRMA_OFFLOAD_DEV]) {
655 err = xfrm_dev_state_add(net, x,
656 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
657 if (err)
658 goto error;
659 }
660
661 return x;
662
663 error:
664 x->km.state = XFRM_STATE_DEAD;
665 xfrm_state_put(x);
666 error_no_put:
667 *errp = err;
668 return NULL;
669 }
670
xfrm_add_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)671 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
672 struct nlattr **attrs)
673 {
674 struct net *net = sock_net(skb->sk);
675 struct xfrm_usersa_info *p = nlmsg_data(nlh);
676 struct xfrm_state *x;
677 int err;
678 struct km_event c;
679
680 err = verify_newsa_info(p, attrs);
681 if (err)
682 return err;
683
684 x = xfrm_state_construct(net, p, attrs, &err);
685 if (!x)
686 return err;
687
688 xfrm_state_hold(x);
689 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
690 err = xfrm_state_add(x);
691 else
692 err = xfrm_state_update(x);
693
694 xfrm_audit_state_add(x, err ? 0 : 1, true);
695
696 if (err < 0) {
697 x->km.state = XFRM_STATE_DEAD;
698 xfrm_dev_state_delete(x);
699 __xfrm_state_put(x);
700 goto out;
701 }
702
703 if (x->km.state == XFRM_STATE_VOID)
704 x->km.state = XFRM_STATE_VALID;
705
706 c.seq = nlh->nlmsg_seq;
707 c.portid = nlh->nlmsg_pid;
708 c.event = nlh->nlmsg_type;
709
710 km_state_notify(x, &c);
711 out:
712 xfrm_state_put(x);
713 return err;
714 }
715
xfrm_user_state_lookup(struct net * net,struct xfrm_usersa_id * p,struct nlattr ** attrs,int * errp)716 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
717 struct xfrm_usersa_id *p,
718 struct nlattr **attrs,
719 int *errp)
720 {
721 struct xfrm_state *x = NULL;
722 struct xfrm_mark m;
723 int err;
724 u32 mark = xfrm_mark_get(attrs, &m);
725
726 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
727 err = -ESRCH;
728 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
729 } else {
730 xfrm_address_t *saddr = NULL;
731
732 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
733 if (!saddr) {
734 err = -EINVAL;
735 goto out;
736 }
737
738 err = -ESRCH;
739 x = xfrm_state_lookup_byaddr(net, mark,
740 &p->daddr, saddr,
741 p->proto, p->family);
742 }
743
744 out:
745 if (!x && errp)
746 *errp = err;
747 return x;
748 }
749
xfrm_del_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)750 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
751 struct nlattr **attrs)
752 {
753 struct net *net = sock_net(skb->sk);
754 struct xfrm_state *x;
755 int err = -ESRCH;
756 struct km_event c;
757 struct xfrm_usersa_id *p = nlmsg_data(nlh);
758
759 x = xfrm_user_state_lookup(net, p, attrs, &err);
760 if (x == NULL)
761 return err;
762
763 if ((err = security_xfrm_state_delete(x)) != 0)
764 goto out;
765
766 if (xfrm_state_kern(x)) {
767 err = -EPERM;
768 goto out;
769 }
770
771 err = xfrm_state_delete(x);
772
773 if (err < 0)
774 goto out;
775
776 c.seq = nlh->nlmsg_seq;
777 c.portid = nlh->nlmsg_pid;
778 c.event = nlh->nlmsg_type;
779 km_state_notify(x, &c);
780
781 out:
782 xfrm_audit_state_delete(x, err ? 0 : 1, true);
783 xfrm_state_put(x);
784 return err;
785 }
786
copy_to_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)787 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
788 {
789 memset(p, 0, sizeof(*p));
790 memcpy(&p->id, &x->id, sizeof(p->id));
791 memcpy(&p->sel, &x->sel, sizeof(p->sel));
792 memcpy(&p->lft, &x->lft, sizeof(p->lft));
793 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
794 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
795 put_unaligned(x->stats.replay, &p->stats.replay);
796 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
797 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
798 p->mode = x->props.mode;
799 p->replay_window = x->props.replay_window;
800 p->reqid = x->props.reqid;
801 p->family = x->props.family;
802 p->flags = x->props.flags;
803 p->seq = x->km.seq;
804 }
805
806 struct xfrm_dump_info {
807 struct sk_buff *in_skb;
808 struct sk_buff *out_skb;
809 u32 nlmsg_seq;
810 u16 nlmsg_flags;
811 };
812
copy_sec_ctx(struct xfrm_sec_ctx * s,struct sk_buff * skb)813 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
814 {
815 struct xfrm_user_sec_ctx *uctx;
816 struct nlattr *attr;
817 int ctx_size = sizeof(*uctx) + s->ctx_len;
818
819 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
820 if (attr == NULL)
821 return -EMSGSIZE;
822
823 uctx = nla_data(attr);
824 uctx->exttype = XFRMA_SEC_CTX;
825 uctx->len = ctx_size;
826 uctx->ctx_doi = s->ctx_doi;
827 uctx->ctx_alg = s->ctx_alg;
828 uctx->ctx_len = s->ctx_len;
829 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
830
831 return 0;
832 }
833
copy_user_offload(struct xfrm_state_offload * xso,struct sk_buff * skb)834 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
835 {
836 struct xfrm_user_offload *xuo;
837 struct nlattr *attr;
838
839 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
840 if (attr == NULL)
841 return -EMSGSIZE;
842
843 xuo = nla_data(attr);
844 memset(xuo, 0, sizeof(*xuo));
845 xuo->ifindex = xso->dev->ifindex;
846 xuo->flags = xso->flags;
847
848 return 0;
849 }
850
copy_to_user_auth(struct xfrm_algo_auth * auth,struct sk_buff * skb)851 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
852 {
853 struct xfrm_algo *algo;
854 struct nlattr *nla;
855
856 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
857 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
858 if (!nla)
859 return -EMSGSIZE;
860
861 algo = nla_data(nla);
862 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
863 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
864 algo->alg_key_len = auth->alg_key_len;
865
866 return 0;
867 }
868
xfrm_smark_put(struct sk_buff * skb,struct xfrm_mark * m)869 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
870 {
871 int ret = 0;
872
873 if (m->v | m->m) {
874 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
875 if (!ret)
876 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
877 }
878 return ret;
879 }
880
881 /* Don't change this without updating xfrm_sa_len! */
copy_to_user_state_extra(struct xfrm_state * x,struct xfrm_usersa_info * p,struct sk_buff * skb)882 static int copy_to_user_state_extra(struct xfrm_state *x,
883 struct xfrm_usersa_info *p,
884 struct sk_buff *skb)
885 {
886 int ret = 0;
887
888 copy_to_user_state(x, p);
889
890 if (x->props.extra_flags) {
891 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
892 x->props.extra_flags);
893 if (ret)
894 goto out;
895 }
896
897 if (x->coaddr) {
898 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
899 if (ret)
900 goto out;
901 }
902 if (x->lastused) {
903 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
904 XFRMA_PAD);
905 if (ret)
906 goto out;
907 }
908 if (x->aead) {
909 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
910 if (ret)
911 goto out;
912 }
913 if (x->aalg) {
914 ret = copy_to_user_auth(x->aalg, skb);
915 if (!ret)
916 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
917 xfrm_alg_auth_len(x->aalg), x->aalg);
918 if (ret)
919 goto out;
920 }
921 if (x->ealg) {
922 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
923 if (ret)
924 goto out;
925 }
926 if (x->calg) {
927 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
928 if (ret)
929 goto out;
930 }
931 if (x->encap) {
932 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
933 if (ret)
934 goto out;
935 }
936 if (x->tfcpad) {
937 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
938 if (ret)
939 goto out;
940 }
941 ret = xfrm_mark_put(skb, &x->mark);
942 if (ret)
943 goto out;
944
945 ret = xfrm_smark_put(skb, &x->props.smark);
946 if (ret)
947 goto out;
948
949 if (x->replay_esn)
950 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
951 xfrm_replay_state_esn_len(x->replay_esn),
952 x->replay_esn);
953 else
954 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
955 &x->replay);
956 if (ret)
957 goto out;
958 if(x->xso.dev)
959 ret = copy_user_offload(&x->xso, skb);
960 if (ret)
961 goto out;
962 if (x->if_id) {
963 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
964 if (ret)
965 goto out;
966 }
967 if (x->security)
968 ret = copy_sec_ctx(x->security, skb);
969 out:
970 return ret;
971 }
972
dump_one_state(struct xfrm_state * x,int count,void * ptr)973 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
974 {
975 struct xfrm_dump_info *sp = ptr;
976 struct sk_buff *in_skb = sp->in_skb;
977 struct sk_buff *skb = sp->out_skb;
978 struct xfrm_translator *xtr;
979 struct xfrm_usersa_info *p;
980 struct nlmsghdr *nlh;
981 int err;
982
983 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
984 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
985 if (nlh == NULL)
986 return -EMSGSIZE;
987
988 p = nlmsg_data(nlh);
989
990 err = copy_to_user_state_extra(x, p, skb);
991 if (err) {
992 nlmsg_cancel(skb, nlh);
993 return err;
994 }
995 nlmsg_end(skb, nlh);
996
997 xtr = xfrm_get_translator();
998 if (xtr) {
999 err = xtr->alloc_compat(skb, nlh);
1000
1001 xfrm_put_translator(xtr);
1002 if (err) {
1003 nlmsg_cancel(skb, nlh);
1004 return err;
1005 }
1006 }
1007
1008 return 0;
1009 }
1010
xfrm_dump_sa_done(struct netlink_callback * cb)1011 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1012 {
1013 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1014 struct sock *sk = cb->skb->sk;
1015 struct net *net = sock_net(sk);
1016
1017 if (cb->args[0])
1018 xfrm_state_walk_done(walk, net);
1019 return 0;
1020 }
1021
xfrm_dump_sa(struct sk_buff * skb,struct netlink_callback * cb)1022 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1023 {
1024 struct net *net = sock_net(skb->sk);
1025 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1026 struct xfrm_dump_info info;
1027
1028 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1029 sizeof(cb->args) - sizeof(cb->args[0]));
1030
1031 info.in_skb = cb->skb;
1032 info.out_skb = skb;
1033 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1034 info.nlmsg_flags = NLM_F_MULTI;
1035
1036 if (!cb->args[0]) {
1037 struct nlattr *attrs[XFRMA_MAX+1];
1038 struct xfrm_address_filter *filter = NULL;
1039 u8 proto = 0;
1040 int err;
1041
1042 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1043 xfrma_policy, cb->extack);
1044 if (err < 0)
1045 return err;
1046
1047 if (attrs[XFRMA_ADDRESS_FILTER]) {
1048 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1049 sizeof(*filter), GFP_KERNEL);
1050 if (filter == NULL)
1051 return -ENOMEM;
1052 }
1053
1054 if (attrs[XFRMA_PROTO])
1055 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1056
1057 xfrm_state_walk_init(walk, proto, filter);
1058 cb->args[0] = 1;
1059 }
1060
1061 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1062
1063 return skb->len;
1064 }
1065
xfrm_state_netlink(struct sk_buff * in_skb,struct xfrm_state * x,u32 seq)1066 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1067 struct xfrm_state *x, u32 seq)
1068 {
1069 struct xfrm_dump_info info;
1070 struct sk_buff *skb;
1071 int err;
1072
1073 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1074 if (!skb)
1075 return ERR_PTR(-ENOMEM);
1076
1077 info.in_skb = in_skb;
1078 info.out_skb = skb;
1079 info.nlmsg_seq = seq;
1080 info.nlmsg_flags = 0;
1081
1082 err = dump_one_state(x, 0, &info);
1083 if (err) {
1084 kfree_skb(skb);
1085 return ERR_PTR(err);
1086 }
1087
1088 return skb;
1089 }
1090
1091 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1092 * Must be called with RCU read lock.
1093 */
xfrm_nlmsg_multicast(struct net * net,struct sk_buff * skb,u32 pid,unsigned int group)1094 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1095 u32 pid, unsigned int group)
1096 {
1097 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1098 struct xfrm_translator *xtr;
1099
1100 if (!nlsk) {
1101 kfree_skb(skb);
1102 return -EPIPE;
1103 }
1104
1105 xtr = xfrm_get_translator();
1106 if (xtr) {
1107 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1108
1109 xfrm_put_translator(xtr);
1110 if (err) {
1111 kfree_skb(skb);
1112 return err;
1113 }
1114 }
1115
1116 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1117 }
1118
xfrm_spdinfo_msgsize(void)1119 static inline unsigned int xfrm_spdinfo_msgsize(void)
1120 {
1121 return NLMSG_ALIGN(4)
1122 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1123 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1124 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1125 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1126 }
1127
build_spdinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1128 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1129 u32 portid, u32 seq, u32 flags)
1130 {
1131 struct xfrmk_spdinfo si;
1132 struct xfrmu_spdinfo spc;
1133 struct xfrmu_spdhinfo sph;
1134 struct xfrmu_spdhthresh spt4, spt6;
1135 struct nlmsghdr *nlh;
1136 int err;
1137 u32 *f;
1138 unsigned lseq;
1139
1140 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1141 if (nlh == NULL) /* shouldn't really happen ... */
1142 return -EMSGSIZE;
1143
1144 f = nlmsg_data(nlh);
1145 *f = flags;
1146 xfrm_spd_getinfo(net, &si);
1147 spc.incnt = si.incnt;
1148 spc.outcnt = si.outcnt;
1149 spc.fwdcnt = si.fwdcnt;
1150 spc.inscnt = si.inscnt;
1151 spc.outscnt = si.outscnt;
1152 spc.fwdscnt = si.fwdscnt;
1153 sph.spdhcnt = si.spdhcnt;
1154 sph.spdhmcnt = si.spdhmcnt;
1155
1156 do {
1157 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1158
1159 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1160 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1161 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1162 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1163 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1164
1165 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1166 if (!err)
1167 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1168 if (!err)
1169 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1170 if (!err)
1171 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1172 if (err) {
1173 nlmsg_cancel(skb, nlh);
1174 return err;
1175 }
1176
1177 nlmsg_end(skb, nlh);
1178 return 0;
1179 }
1180
xfrm_set_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1181 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1182 struct nlattr **attrs)
1183 {
1184 struct net *net = sock_net(skb->sk);
1185 struct xfrmu_spdhthresh *thresh4 = NULL;
1186 struct xfrmu_spdhthresh *thresh6 = NULL;
1187
1188 /* selector prefixlen thresholds to hash policies */
1189 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1190 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1191
1192 if (nla_len(rta) < sizeof(*thresh4))
1193 return -EINVAL;
1194 thresh4 = nla_data(rta);
1195 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1196 return -EINVAL;
1197 }
1198 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1199 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1200
1201 if (nla_len(rta) < sizeof(*thresh6))
1202 return -EINVAL;
1203 thresh6 = nla_data(rta);
1204 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1205 return -EINVAL;
1206 }
1207
1208 if (thresh4 || thresh6) {
1209 write_seqlock(&net->xfrm.policy_hthresh.lock);
1210 if (thresh4) {
1211 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1212 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1213 }
1214 if (thresh6) {
1215 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1216 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1217 }
1218 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1219
1220 xfrm_policy_hash_rebuild(net);
1221 }
1222
1223 return 0;
1224 }
1225
xfrm_get_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1226 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1227 struct nlattr **attrs)
1228 {
1229 struct net *net = sock_net(skb->sk);
1230 struct sk_buff *r_skb;
1231 u32 *flags = nlmsg_data(nlh);
1232 u32 sportid = NETLINK_CB(skb).portid;
1233 u32 seq = nlh->nlmsg_seq;
1234 int err;
1235
1236 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1237 if (r_skb == NULL)
1238 return -ENOMEM;
1239
1240 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1241 BUG_ON(err < 0);
1242
1243 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1244 }
1245
xfrm_sadinfo_msgsize(void)1246 static inline unsigned int xfrm_sadinfo_msgsize(void)
1247 {
1248 return NLMSG_ALIGN(4)
1249 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1250 + nla_total_size(4); /* XFRMA_SAD_CNT */
1251 }
1252
build_sadinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1253 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1254 u32 portid, u32 seq, u32 flags)
1255 {
1256 struct xfrmk_sadinfo si;
1257 struct xfrmu_sadhinfo sh;
1258 struct nlmsghdr *nlh;
1259 int err;
1260 u32 *f;
1261
1262 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1263 if (nlh == NULL) /* shouldn't really happen ... */
1264 return -EMSGSIZE;
1265
1266 f = nlmsg_data(nlh);
1267 *f = flags;
1268 xfrm_sad_getinfo(net, &si);
1269
1270 sh.sadhmcnt = si.sadhmcnt;
1271 sh.sadhcnt = si.sadhcnt;
1272
1273 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1274 if (!err)
1275 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1276 if (err) {
1277 nlmsg_cancel(skb, nlh);
1278 return err;
1279 }
1280
1281 nlmsg_end(skb, nlh);
1282 return 0;
1283 }
1284
xfrm_get_sadinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1285 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1286 struct nlattr **attrs)
1287 {
1288 struct net *net = sock_net(skb->sk);
1289 struct sk_buff *r_skb;
1290 u32 *flags = nlmsg_data(nlh);
1291 u32 sportid = NETLINK_CB(skb).portid;
1292 u32 seq = nlh->nlmsg_seq;
1293 int err;
1294
1295 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1296 if (r_skb == NULL)
1297 return -ENOMEM;
1298
1299 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1300 BUG_ON(err < 0);
1301
1302 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1303 }
1304
xfrm_get_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1305 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1306 struct nlattr **attrs)
1307 {
1308 struct net *net = sock_net(skb->sk);
1309 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1310 struct xfrm_state *x;
1311 struct sk_buff *resp_skb;
1312 int err = -ESRCH;
1313
1314 x = xfrm_user_state_lookup(net, p, attrs, &err);
1315 if (x == NULL)
1316 goto out_noput;
1317
1318 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1319 if (IS_ERR(resp_skb)) {
1320 err = PTR_ERR(resp_skb);
1321 } else {
1322 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1323 }
1324 xfrm_state_put(x);
1325 out_noput:
1326 return err;
1327 }
1328
xfrm_alloc_userspi(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1329 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1330 struct nlattr **attrs)
1331 {
1332 struct net *net = sock_net(skb->sk);
1333 struct xfrm_state *x;
1334 struct xfrm_userspi_info *p;
1335 struct xfrm_translator *xtr;
1336 struct sk_buff *resp_skb;
1337 xfrm_address_t *daddr;
1338 int family;
1339 int err;
1340 u32 mark;
1341 struct xfrm_mark m;
1342 u32 if_id = 0;
1343
1344 p = nlmsg_data(nlh);
1345 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1346 if (err)
1347 goto out_noput;
1348
1349 family = p->info.family;
1350 daddr = &p->info.id.daddr;
1351
1352 x = NULL;
1353
1354 mark = xfrm_mark_get(attrs, &m);
1355
1356 if (attrs[XFRMA_IF_ID])
1357 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1358
1359 if (p->info.seq) {
1360 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1361 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1362 xfrm_state_put(x);
1363 x = NULL;
1364 }
1365 }
1366
1367 if (!x)
1368 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1369 if_id, p->info.id.proto, daddr,
1370 &p->info.saddr, 1,
1371 family);
1372 err = -ENOENT;
1373 if (x == NULL)
1374 goto out_noput;
1375
1376 err = xfrm_alloc_spi(x, p->min, p->max);
1377 if (err)
1378 goto out;
1379
1380 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1381 if (IS_ERR(resp_skb)) {
1382 err = PTR_ERR(resp_skb);
1383 goto out;
1384 }
1385
1386 xtr = xfrm_get_translator();
1387 if (xtr) {
1388 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1389
1390 xfrm_put_translator(xtr);
1391 if (err) {
1392 kfree_skb(resp_skb);
1393 goto out;
1394 }
1395 }
1396
1397 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1398
1399 out:
1400 xfrm_state_put(x);
1401 out_noput:
1402 return err;
1403 }
1404
verify_policy_dir(u8 dir)1405 static int verify_policy_dir(u8 dir)
1406 {
1407 switch (dir) {
1408 case XFRM_POLICY_IN:
1409 case XFRM_POLICY_OUT:
1410 case XFRM_POLICY_FWD:
1411 break;
1412
1413 default:
1414 return -EINVAL;
1415 }
1416
1417 return 0;
1418 }
1419
verify_policy_type(u8 type)1420 static int verify_policy_type(u8 type)
1421 {
1422 switch (type) {
1423 case XFRM_POLICY_TYPE_MAIN:
1424 #ifdef CONFIG_XFRM_SUB_POLICY
1425 case XFRM_POLICY_TYPE_SUB:
1426 #endif
1427 break;
1428
1429 default:
1430 return -EINVAL;
1431 }
1432
1433 return 0;
1434 }
1435
verify_newpolicy_info(struct xfrm_userpolicy_info * p)1436 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1437 {
1438 int ret;
1439
1440 switch (p->share) {
1441 case XFRM_SHARE_ANY:
1442 case XFRM_SHARE_SESSION:
1443 case XFRM_SHARE_USER:
1444 case XFRM_SHARE_UNIQUE:
1445 break;
1446
1447 default:
1448 return -EINVAL;
1449 }
1450
1451 switch (p->action) {
1452 case XFRM_POLICY_ALLOW:
1453 case XFRM_POLICY_BLOCK:
1454 break;
1455
1456 default:
1457 return -EINVAL;
1458 }
1459
1460 switch (p->sel.family) {
1461 case AF_INET:
1462 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1463 return -EINVAL;
1464
1465 break;
1466
1467 case AF_INET6:
1468 #if IS_ENABLED(CONFIG_IPV6)
1469 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1470 return -EINVAL;
1471
1472 break;
1473 #else
1474 return -EAFNOSUPPORT;
1475 #endif
1476
1477 default:
1478 return -EINVAL;
1479 }
1480
1481 ret = verify_policy_dir(p->dir);
1482 if (ret)
1483 return ret;
1484 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1485 return -EINVAL;
1486
1487 return 0;
1488 }
1489
copy_from_user_sec_ctx(struct xfrm_policy * pol,struct nlattr ** attrs)1490 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1491 {
1492 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1493 struct xfrm_user_sec_ctx *uctx;
1494
1495 if (!rt)
1496 return 0;
1497
1498 uctx = nla_data(rt);
1499 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1500 }
1501
copy_templates(struct xfrm_policy * xp,struct xfrm_user_tmpl * ut,int nr)1502 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1503 int nr)
1504 {
1505 int i;
1506
1507 xp->xfrm_nr = nr;
1508 for (i = 0; i < nr; i++, ut++) {
1509 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1510
1511 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1512 memcpy(&t->saddr, &ut->saddr,
1513 sizeof(xfrm_address_t));
1514 t->reqid = ut->reqid;
1515 t->mode = ut->mode;
1516 t->share = ut->share;
1517 t->optional = ut->optional;
1518 t->aalgos = ut->aalgos;
1519 t->ealgos = ut->ealgos;
1520 t->calgos = ut->calgos;
1521 /* If all masks are ~0, then we allow all algorithms. */
1522 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1523 t->encap_family = ut->family;
1524 }
1525 }
1526
validate_tmpl(int nr,struct xfrm_user_tmpl * ut,u16 family)1527 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1528 {
1529 u16 prev_family;
1530 int i;
1531
1532 if (nr > XFRM_MAX_DEPTH)
1533 return -EINVAL;
1534
1535 prev_family = family;
1536
1537 for (i = 0; i < nr; i++) {
1538 /* We never validated the ut->family value, so many
1539 * applications simply leave it at zero. The check was
1540 * never made and ut->family was ignored because all
1541 * templates could be assumed to have the same family as
1542 * the policy itself. Now that we will have ipv4-in-ipv6
1543 * and ipv6-in-ipv4 tunnels, this is no longer true.
1544 */
1545 if (!ut[i].family)
1546 ut[i].family = family;
1547
1548 switch (ut[i].mode) {
1549 case XFRM_MODE_TUNNEL:
1550 case XFRM_MODE_BEET:
1551 break;
1552 default:
1553 if (ut[i].family != prev_family)
1554 return -EINVAL;
1555 break;
1556 }
1557 if (ut[i].mode >= XFRM_MODE_MAX)
1558 return -EINVAL;
1559
1560 prev_family = ut[i].family;
1561
1562 switch (ut[i].family) {
1563 case AF_INET:
1564 break;
1565 #if IS_ENABLED(CONFIG_IPV6)
1566 case AF_INET6:
1567 break;
1568 #endif
1569 default:
1570 return -EINVAL;
1571 }
1572
1573 if (!xfrm_id_proto_valid(ut[i].id.proto))
1574 return -EINVAL;
1575 }
1576
1577 return 0;
1578 }
1579
copy_from_user_tmpl(struct xfrm_policy * pol,struct nlattr ** attrs)1580 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1581 {
1582 struct nlattr *rt = attrs[XFRMA_TMPL];
1583
1584 if (!rt) {
1585 pol->xfrm_nr = 0;
1586 } else {
1587 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1588 int nr = nla_len(rt) / sizeof(*utmpl);
1589 int err;
1590
1591 err = validate_tmpl(nr, utmpl, pol->family);
1592 if (err)
1593 return err;
1594
1595 copy_templates(pol, utmpl, nr);
1596 }
1597 return 0;
1598 }
1599
copy_from_user_policy_type(u8 * tp,struct nlattr ** attrs)1600 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1601 {
1602 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1603 struct xfrm_userpolicy_type *upt;
1604 u8 type = XFRM_POLICY_TYPE_MAIN;
1605 int err;
1606
1607 if (rt) {
1608 upt = nla_data(rt);
1609 type = upt->type;
1610 }
1611
1612 err = verify_policy_type(type);
1613 if (err)
1614 return err;
1615
1616 *tp = type;
1617 return 0;
1618 }
1619
copy_from_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p)1620 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1621 {
1622 xp->priority = p->priority;
1623 xp->index = p->index;
1624 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1625 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1626 xp->action = p->action;
1627 xp->flags = p->flags;
1628 xp->family = p->sel.family;
1629 /* XXX xp->share = p->share; */
1630 }
1631
copy_to_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p,int dir)1632 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1633 {
1634 memset(p, 0, sizeof(*p));
1635 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1636 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1637 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1638 p->priority = xp->priority;
1639 p->index = xp->index;
1640 p->sel.family = xp->family;
1641 p->dir = dir;
1642 p->action = xp->action;
1643 p->flags = xp->flags;
1644 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1645 }
1646
xfrm_policy_construct(struct net * net,struct xfrm_userpolicy_info * p,struct nlattr ** attrs,int * errp)1647 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1648 {
1649 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1650 int err;
1651
1652 if (!xp) {
1653 *errp = -ENOMEM;
1654 return NULL;
1655 }
1656
1657 copy_from_user_policy(xp, p);
1658
1659 err = copy_from_user_policy_type(&xp->type, attrs);
1660 if (err)
1661 goto error;
1662
1663 if (!(err = copy_from_user_tmpl(xp, attrs)))
1664 err = copy_from_user_sec_ctx(xp, attrs);
1665 if (err)
1666 goto error;
1667
1668 xfrm_mark_get(attrs, &xp->mark);
1669
1670 if (attrs[XFRMA_IF_ID])
1671 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1672
1673 return xp;
1674 error:
1675 *errp = err;
1676 xp->walk.dead = 1;
1677 xfrm_policy_destroy(xp);
1678 return NULL;
1679 }
1680
xfrm_add_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1681 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1682 struct nlattr **attrs)
1683 {
1684 struct net *net = sock_net(skb->sk);
1685 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1686 struct xfrm_policy *xp;
1687 struct km_event c;
1688 int err;
1689 int excl;
1690
1691 err = verify_newpolicy_info(p);
1692 if (err)
1693 return err;
1694 err = verify_sec_ctx_len(attrs);
1695 if (err)
1696 return err;
1697
1698 xp = xfrm_policy_construct(net, p, attrs, &err);
1699 if (!xp)
1700 return err;
1701
1702 /* shouldn't excl be based on nlh flags??
1703 * Aha! this is anti-netlink really i.e more pfkey derived
1704 * in netlink excl is a flag and you wouldnt need
1705 * a type XFRM_MSG_UPDPOLICY - JHS */
1706 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1707 err = xfrm_policy_insert(p->dir, xp, excl);
1708 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1709
1710 if (err) {
1711 security_xfrm_policy_free(xp->security);
1712 kfree(xp);
1713 return err;
1714 }
1715
1716 c.event = nlh->nlmsg_type;
1717 c.seq = nlh->nlmsg_seq;
1718 c.portid = nlh->nlmsg_pid;
1719 km_policy_notify(xp, p->dir, &c);
1720
1721 xfrm_pol_put(xp);
1722
1723 return 0;
1724 }
1725
copy_to_user_tmpl(struct xfrm_policy * xp,struct sk_buff * skb)1726 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1727 {
1728 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1729 int i;
1730
1731 if (xp->xfrm_nr == 0)
1732 return 0;
1733
1734 for (i = 0; i < xp->xfrm_nr; i++) {
1735 struct xfrm_user_tmpl *up = &vec[i];
1736 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1737
1738 memset(up, 0, sizeof(*up));
1739 memcpy(&up->id, &kp->id, sizeof(up->id));
1740 up->family = kp->encap_family;
1741 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1742 up->reqid = kp->reqid;
1743 up->mode = kp->mode;
1744 up->share = kp->share;
1745 up->optional = kp->optional;
1746 up->aalgos = kp->aalgos;
1747 up->ealgos = kp->ealgos;
1748 up->calgos = kp->calgos;
1749 }
1750
1751 return nla_put(skb, XFRMA_TMPL,
1752 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1753 }
1754
copy_to_user_state_sec_ctx(struct xfrm_state * x,struct sk_buff * skb)1755 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1756 {
1757 if (x->security) {
1758 return copy_sec_ctx(x->security, skb);
1759 }
1760 return 0;
1761 }
1762
copy_to_user_sec_ctx(struct xfrm_policy * xp,struct sk_buff * skb)1763 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1764 {
1765 if (xp->security)
1766 return copy_sec_ctx(xp->security, skb);
1767 return 0;
1768 }
userpolicy_type_attrsize(void)1769 static inline unsigned int userpolicy_type_attrsize(void)
1770 {
1771 #ifdef CONFIG_XFRM_SUB_POLICY
1772 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1773 #else
1774 return 0;
1775 #endif
1776 }
1777
1778 #ifdef CONFIG_XFRM_SUB_POLICY
copy_to_user_policy_type(u8 type,struct sk_buff * skb)1779 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1780 {
1781 struct xfrm_userpolicy_type upt;
1782
1783 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1784 memset(&upt, 0, sizeof(upt));
1785 upt.type = type;
1786
1787 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1788 }
1789
1790 #else
copy_to_user_policy_type(u8 type,struct sk_buff * skb)1791 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1792 {
1793 return 0;
1794 }
1795 #endif
1796
dump_one_policy(struct xfrm_policy * xp,int dir,int count,void * ptr)1797 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1798 {
1799 struct xfrm_dump_info *sp = ptr;
1800 struct xfrm_userpolicy_info *p;
1801 struct sk_buff *in_skb = sp->in_skb;
1802 struct sk_buff *skb = sp->out_skb;
1803 struct xfrm_translator *xtr;
1804 struct nlmsghdr *nlh;
1805 int err;
1806
1807 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1808 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1809 if (nlh == NULL)
1810 return -EMSGSIZE;
1811
1812 p = nlmsg_data(nlh);
1813 copy_to_user_policy(xp, p, dir);
1814 err = copy_to_user_tmpl(xp, skb);
1815 if (!err)
1816 err = copy_to_user_sec_ctx(xp, skb);
1817 if (!err)
1818 err = copy_to_user_policy_type(xp->type, skb);
1819 if (!err)
1820 err = xfrm_mark_put(skb, &xp->mark);
1821 if (!err)
1822 err = xfrm_if_id_put(skb, xp->if_id);
1823 if (err) {
1824 nlmsg_cancel(skb, nlh);
1825 return err;
1826 }
1827 nlmsg_end(skb, nlh);
1828
1829 xtr = xfrm_get_translator();
1830 if (xtr) {
1831 err = xtr->alloc_compat(skb, nlh);
1832
1833 xfrm_put_translator(xtr);
1834 if (err) {
1835 nlmsg_cancel(skb, nlh);
1836 return err;
1837 }
1838 }
1839
1840 return 0;
1841 }
1842
xfrm_dump_policy_done(struct netlink_callback * cb)1843 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1844 {
1845 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1846 struct net *net = sock_net(cb->skb->sk);
1847
1848 xfrm_policy_walk_done(walk, net);
1849 return 0;
1850 }
1851
xfrm_dump_policy_start(struct netlink_callback * cb)1852 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1853 {
1854 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1855
1856 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1857
1858 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1859 return 0;
1860 }
1861
xfrm_dump_policy(struct sk_buff * skb,struct netlink_callback * cb)1862 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1863 {
1864 struct net *net = sock_net(skb->sk);
1865 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1866 struct xfrm_dump_info info;
1867
1868 info.in_skb = cb->skb;
1869 info.out_skb = skb;
1870 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1871 info.nlmsg_flags = NLM_F_MULTI;
1872
1873 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1874
1875 return skb->len;
1876 }
1877
xfrm_policy_netlink(struct sk_buff * in_skb,struct xfrm_policy * xp,int dir,u32 seq)1878 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1879 struct xfrm_policy *xp,
1880 int dir, u32 seq)
1881 {
1882 struct xfrm_dump_info info;
1883 struct sk_buff *skb;
1884 int err;
1885
1886 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1887 if (!skb)
1888 return ERR_PTR(-ENOMEM);
1889
1890 info.in_skb = in_skb;
1891 info.out_skb = skb;
1892 info.nlmsg_seq = seq;
1893 info.nlmsg_flags = 0;
1894
1895 err = dump_one_policy(xp, dir, 0, &info);
1896 if (err) {
1897 kfree_skb(skb);
1898 return ERR_PTR(err);
1899 }
1900
1901 return skb;
1902 }
1903
xfrm_get_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1904 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1905 struct nlattr **attrs)
1906 {
1907 struct net *net = sock_net(skb->sk);
1908 struct xfrm_policy *xp;
1909 struct xfrm_userpolicy_id *p;
1910 u8 type = XFRM_POLICY_TYPE_MAIN;
1911 int err;
1912 struct km_event c;
1913 int delete;
1914 struct xfrm_mark m;
1915 u32 if_id = 0;
1916
1917 p = nlmsg_data(nlh);
1918 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1919
1920 err = copy_from_user_policy_type(&type, attrs);
1921 if (err)
1922 return err;
1923
1924 err = verify_policy_dir(p->dir);
1925 if (err)
1926 return err;
1927
1928 if (attrs[XFRMA_IF_ID])
1929 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1930
1931 xfrm_mark_get(attrs, &m);
1932
1933 if (p->index)
1934 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
1935 p->index, delete, &err);
1936 else {
1937 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1938 struct xfrm_sec_ctx *ctx;
1939
1940 err = verify_sec_ctx_len(attrs);
1941 if (err)
1942 return err;
1943
1944 ctx = NULL;
1945 if (rt) {
1946 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1947
1948 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1949 if (err)
1950 return err;
1951 }
1952 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
1953 &p->sel, ctx, delete, &err);
1954 security_xfrm_policy_free(ctx);
1955 }
1956 if (xp == NULL)
1957 return -ENOENT;
1958
1959 if (!delete) {
1960 struct sk_buff *resp_skb;
1961
1962 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1963 if (IS_ERR(resp_skb)) {
1964 err = PTR_ERR(resp_skb);
1965 } else {
1966 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1967 NETLINK_CB(skb).portid);
1968 }
1969 } else {
1970 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1971
1972 if (err != 0)
1973 goto out;
1974
1975 c.data.byid = p->index;
1976 c.event = nlh->nlmsg_type;
1977 c.seq = nlh->nlmsg_seq;
1978 c.portid = nlh->nlmsg_pid;
1979 km_policy_notify(xp, p->dir, &c);
1980 }
1981
1982 out:
1983 xfrm_pol_put(xp);
1984 return err;
1985 }
1986
xfrm_flush_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1987 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1988 struct nlattr **attrs)
1989 {
1990 struct net *net = sock_net(skb->sk);
1991 struct km_event c;
1992 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1993 int err;
1994
1995 err = xfrm_state_flush(net, p->proto, true, false);
1996 if (err) {
1997 if (err == -ESRCH) /* empty table */
1998 return 0;
1999 return err;
2000 }
2001 c.data.proto = p->proto;
2002 c.event = nlh->nlmsg_type;
2003 c.seq = nlh->nlmsg_seq;
2004 c.portid = nlh->nlmsg_pid;
2005 c.net = net;
2006 km_state_notify(NULL, &c);
2007
2008 return 0;
2009 }
2010
xfrm_aevent_msgsize(struct xfrm_state * x)2011 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2012 {
2013 unsigned int replay_size = x->replay_esn ?
2014 xfrm_replay_state_esn_len(x->replay_esn) :
2015 sizeof(struct xfrm_replay_state);
2016
2017 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2018 + nla_total_size(replay_size)
2019 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2020 + nla_total_size(sizeof(struct xfrm_mark))
2021 + nla_total_size(4) /* XFRM_AE_RTHR */
2022 + nla_total_size(4); /* XFRM_AE_ETHR */
2023 }
2024
build_aevent(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2025 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2026 {
2027 struct xfrm_aevent_id *id;
2028 struct nlmsghdr *nlh;
2029 int err;
2030
2031 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2032 if (nlh == NULL)
2033 return -EMSGSIZE;
2034
2035 id = nlmsg_data(nlh);
2036 memset(&id->sa_id, 0, sizeof(id->sa_id));
2037 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2038 id->sa_id.spi = x->id.spi;
2039 id->sa_id.family = x->props.family;
2040 id->sa_id.proto = x->id.proto;
2041 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2042 id->reqid = x->props.reqid;
2043 id->flags = c->data.aevent;
2044
2045 if (x->replay_esn) {
2046 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2047 xfrm_replay_state_esn_len(x->replay_esn),
2048 x->replay_esn);
2049 } else {
2050 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2051 &x->replay);
2052 }
2053 if (err)
2054 goto out_cancel;
2055 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2056 XFRMA_PAD);
2057 if (err)
2058 goto out_cancel;
2059
2060 if (id->flags & XFRM_AE_RTHR) {
2061 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2062 if (err)
2063 goto out_cancel;
2064 }
2065 if (id->flags & XFRM_AE_ETHR) {
2066 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2067 x->replay_maxage * 10 / HZ);
2068 if (err)
2069 goto out_cancel;
2070 }
2071 err = xfrm_mark_put(skb, &x->mark);
2072 if (err)
2073 goto out_cancel;
2074
2075 err = xfrm_if_id_put(skb, x->if_id);
2076 if (err)
2077 goto out_cancel;
2078
2079 nlmsg_end(skb, nlh);
2080 return 0;
2081
2082 out_cancel:
2083 nlmsg_cancel(skb, nlh);
2084 return err;
2085 }
2086
xfrm_get_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2087 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2088 struct nlattr **attrs)
2089 {
2090 struct net *net = sock_net(skb->sk);
2091 struct xfrm_state *x;
2092 struct sk_buff *r_skb;
2093 int err;
2094 struct km_event c;
2095 u32 mark;
2096 struct xfrm_mark m;
2097 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2098 struct xfrm_usersa_id *id = &p->sa_id;
2099
2100 mark = xfrm_mark_get(attrs, &m);
2101
2102 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2103 if (x == NULL)
2104 return -ESRCH;
2105
2106 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2107 if (r_skb == NULL) {
2108 xfrm_state_put(x);
2109 return -ENOMEM;
2110 }
2111
2112 /*
2113 * XXX: is this lock really needed - none of the other
2114 * gets lock (the concern is things getting updated
2115 * while we are still reading) - jhs
2116 */
2117 spin_lock_bh(&x->lock);
2118 c.data.aevent = p->flags;
2119 c.seq = nlh->nlmsg_seq;
2120 c.portid = nlh->nlmsg_pid;
2121
2122 err = build_aevent(r_skb, x, &c);
2123 BUG_ON(err < 0);
2124
2125 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2126 spin_unlock_bh(&x->lock);
2127 xfrm_state_put(x);
2128 return err;
2129 }
2130
xfrm_new_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2131 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2132 struct nlattr **attrs)
2133 {
2134 struct net *net = sock_net(skb->sk);
2135 struct xfrm_state *x;
2136 struct km_event c;
2137 int err = -EINVAL;
2138 u32 mark = 0;
2139 struct xfrm_mark m;
2140 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2141 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2142 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2143 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2144 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2145 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2146
2147 if (!lt && !rp && !re && !et && !rt)
2148 return err;
2149
2150 /* pedantic mode - thou shalt sayeth replaceth */
2151 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2152 return err;
2153
2154 mark = xfrm_mark_get(attrs, &m);
2155
2156 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2157 if (x == NULL)
2158 return -ESRCH;
2159
2160 if (x->km.state != XFRM_STATE_VALID)
2161 goto out;
2162
2163 err = xfrm_replay_verify_len(x->replay_esn, re);
2164 if (err)
2165 goto out;
2166
2167 spin_lock_bh(&x->lock);
2168 xfrm_update_ae_params(x, attrs, 1);
2169 spin_unlock_bh(&x->lock);
2170
2171 c.event = nlh->nlmsg_type;
2172 c.seq = nlh->nlmsg_seq;
2173 c.portid = nlh->nlmsg_pid;
2174 c.data.aevent = XFRM_AE_CU;
2175 km_state_notify(x, &c);
2176 err = 0;
2177 out:
2178 xfrm_state_put(x);
2179 return err;
2180 }
2181
xfrm_flush_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2182 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2183 struct nlattr **attrs)
2184 {
2185 struct net *net = sock_net(skb->sk);
2186 struct km_event c;
2187 u8 type = XFRM_POLICY_TYPE_MAIN;
2188 int err;
2189
2190 err = copy_from_user_policy_type(&type, attrs);
2191 if (err)
2192 return err;
2193
2194 err = xfrm_policy_flush(net, type, true);
2195 if (err) {
2196 if (err == -ESRCH) /* empty table */
2197 return 0;
2198 return err;
2199 }
2200
2201 c.data.type = type;
2202 c.event = nlh->nlmsg_type;
2203 c.seq = nlh->nlmsg_seq;
2204 c.portid = nlh->nlmsg_pid;
2205 c.net = net;
2206 km_policy_notify(NULL, 0, &c);
2207 return 0;
2208 }
2209
xfrm_add_pol_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2210 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2211 struct nlattr **attrs)
2212 {
2213 struct net *net = sock_net(skb->sk);
2214 struct xfrm_policy *xp;
2215 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2216 struct xfrm_userpolicy_info *p = &up->pol;
2217 u8 type = XFRM_POLICY_TYPE_MAIN;
2218 int err = -ENOENT;
2219 struct xfrm_mark m;
2220 u32 if_id = 0;
2221
2222 err = copy_from_user_policy_type(&type, attrs);
2223 if (err)
2224 return err;
2225
2226 err = verify_policy_dir(p->dir);
2227 if (err)
2228 return err;
2229
2230 if (attrs[XFRMA_IF_ID])
2231 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2232
2233 xfrm_mark_get(attrs, &m);
2234
2235 if (p->index)
2236 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2237 0, &err);
2238 else {
2239 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2240 struct xfrm_sec_ctx *ctx;
2241
2242 err = verify_sec_ctx_len(attrs);
2243 if (err)
2244 return err;
2245
2246 ctx = NULL;
2247 if (rt) {
2248 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2249
2250 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2251 if (err)
2252 return err;
2253 }
2254 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2255 &p->sel, ctx, 0, &err);
2256 security_xfrm_policy_free(ctx);
2257 }
2258 if (xp == NULL)
2259 return -ENOENT;
2260
2261 if (unlikely(xp->walk.dead))
2262 goto out;
2263
2264 err = 0;
2265 if (up->hard) {
2266 xfrm_policy_delete(xp, p->dir);
2267 xfrm_audit_policy_delete(xp, 1, true);
2268 }
2269 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2270
2271 out:
2272 xfrm_pol_put(xp);
2273 return err;
2274 }
2275
xfrm_add_sa_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2276 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2277 struct nlattr **attrs)
2278 {
2279 struct net *net = sock_net(skb->sk);
2280 struct xfrm_state *x;
2281 int err;
2282 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2283 struct xfrm_usersa_info *p = &ue->state;
2284 struct xfrm_mark m;
2285 u32 mark = xfrm_mark_get(attrs, &m);
2286
2287 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2288
2289 err = -ENOENT;
2290 if (x == NULL)
2291 return err;
2292
2293 spin_lock_bh(&x->lock);
2294 err = -EINVAL;
2295 if (x->km.state != XFRM_STATE_VALID)
2296 goto out;
2297 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2298
2299 if (ue->hard) {
2300 __xfrm_state_delete(x);
2301 xfrm_audit_state_delete(x, 1, true);
2302 }
2303 err = 0;
2304 out:
2305 spin_unlock_bh(&x->lock);
2306 xfrm_state_put(x);
2307 return err;
2308 }
2309
xfrm_add_acquire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2310 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2311 struct nlattr **attrs)
2312 {
2313 struct net *net = sock_net(skb->sk);
2314 struct xfrm_policy *xp;
2315 struct xfrm_user_tmpl *ut;
2316 int i;
2317 struct nlattr *rt = attrs[XFRMA_TMPL];
2318 struct xfrm_mark mark;
2319
2320 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2321 struct xfrm_state *x = xfrm_state_alloc(net);
2322 int err = -ENOMEM;
2323
2324 if (!x)
2325 goto nomem;
2326
2327 xfrm_mark_get(attrs, &mark);
2328
2329 err = verify_newpolicy_info(&ua->policy);
2330 if (err)
2331 goto free_state;
2332 err = verify_sec_ctx_len(attrs);
2333 if (err)
2334 goto free_state;
2335
2336 /* build an XP */
2337 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2338 if (!xp)
2339 goto free_state;
2340
2341 memcpy(&x->id, &ua->id, sizeof(ua->id));
2342 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2343 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2344 xp->mark.m = x->mark.m = mark.m;
2345 xp->mark.v = x->mark.v = mark.v;
2346 ut = nla_data(rt);
2347 /* extract the templates and for each call km_key */
2348 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2349 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2350 memcpy(&x->id, &t->id, sizeof(x->id));
2351 x->props.mode = t->mode;
2352 x->props.reqid = t->reqid;
2353 x->props.family = ut->family;
2354 t->aalgos = ua->aalgos;
2355 t->ealgos = ua->ealgos;
2356 t->calgos = ua->calgos;
2357 err = km_query(x, t, xp);
2358
2359 }
2360
2361 xfrm_state_free(x);
2362 kfree(xp);
2363
2364 return 0;
2365
2366 free_state:
2367 xfrm_state_free(x);
2368 nomem:
2369 return err;
2370 }
2371
2372 #ifdef CONFIG_XFRM_MIGRATE
copy_from_user_migrate(struct xfrm_migrate * ma,struct xfrm_kmaddress * k,struct nlattr ** attrs,int * num)2373 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2374 struct xfrm_kmaddress *k,
2375 struct nlattr **attrs, int *num)
2376 {
2377 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2378 struct xfrm_user_migrate *um;
2379 int i, num_migrate;
2380
2381 if (k != NULL) {
2382 struct xfrm_user_kmaddress *uk;
2383
2384 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2385 memcpy(&k->local, &uk->local, sizeof(k->local));
2386 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2387 k->family = uk->family;
2388 k->reserved = uk->reserved;
2389 }
2390
2391 um = nla_data(rt);
2392 num_migrate = nla_len(rt) / sizeof(*um);
2393
2394 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2395 return -EINVAL;
2396
2397 for (i = 0; i < num_migrate; i++, um++, ma++) {
2398 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2399 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2400 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2401 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2402
2403 ma->proto = um->proto;
2404 ma->mode = um->mode;
2405 ma->reqid = um->reqid;
2406
2407 ma->old_family = um->old_family;
2408 ma->new_family = um->new_family;
2409 }
2410
2411 *num = i;
2412 return 0;
2413 }
2414
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2415 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2416 struct nlattr **attrs)
2417 {
2418 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2419 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2420 struct xfrm_kmaddress km, *kmp;
2421 u8 type;
2422 int err;
2423 int n = 0;
2424 struct net *net = sock_net(skb->sk);
2425 struct xfrm_encap_tmpl *encap = NULL;
2426
2427 if (attrs[XFRMA_MIGRATE] == NULL)
2428 return -EINVAL;
2429
2430 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2431
2432 err = copy_from_user_policy_type(&type, attrs);
2433 if (err)
2434 return err;
2435
2436 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2437 if (err)
2438 return err;
2439
2440 if (!n)
2441 return 0;
2442
2443 if (attrs[XFRMA_ENCAP]) {
2444 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2445 sizeof(*encap), GFP_KERNEL);
2446 if (!encap)
2447 return 0;
2448 }
2449
2450 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2451
2452 kfree(encap);
2453
2454 return err;
2455 }
2456 #else
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2457 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2458 struct nlattr **attrs)
2459 {
2460 return -ENOPROTOOPT;
2461 }
2462 #endif
2463
2464 #ifdef CONFIG_XFRM_MIGRATE
copy_to_user_migrate(const struct xfrm_migrate * m,struct sk_buff * skb)2465 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2466 {
2467 struct xfrm_user_migrate um;
2468
2469 memset(&um, 0, sizeof(um));
2470 um.proto = m->proto;
2471 um.mode = m->mode;
2472 um.reqid = m->reqid;
2473 um.old_family = m->old_family;
2474 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2475 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2476 um.new_family = m->new_family;
2477 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2478 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2479
2480 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2481 }
2482
copy_to_user_kmaddress(const struct xfrm_kmaddress * k,struct sk_buff * skb)2483 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2484 {
2485 struct xfrm_user_kmaddress uk;
2486
2487 memset(&uk, 0, sizeof(uk));
2488 uk.family = k->family;
2489 uk.reserved = k->reserved;
2490 memcpy(&uk.local, &k->local, sizeof(uk.local));
2491 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2492
2493 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2494 }
2495
xfrm_migrate_msgsize(int num_migrate,int with_kma,int with_encp)2496 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2497 int with_encp)
2498 {
2499 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2500 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2501 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2502 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2503 + userpolicy_type_attrsize();
2504 }
2505
build_migrate(struct sk_buff * skb,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_selector * sel,const struct xfrm_encap_tmpl * encap,u8 dir,u8 type)2506 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2507 int num_migrate, const struct xfrm_kmaddress *k,
2508 const struct xfrm_selector *sel,
2509 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2510 {
2511 const struct xfrm_migrate *mp;
2512 struct xfrm_userpolicy_id *pol_id;
2513 struct nlmsghdr *nlh;
2514 int i, err;
2515
2516 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2517 if (nlh == NULL)
2518 return -EMSGSIZE;
2519
2520 pol_id = nlmsg_data(nlh);
2521 /* copy data from selector, dir, and type to the pol_id */
2522 memset(pol_id, 0, sizeof(*pol_id));
2523 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2524 pol_id->dir = dir;
2525
2526 if (k != NULL) {
2527 err = copy_to_user_kmaddress(k, skb);
2528 if (err)
2529 goto out_cancel;
2530 }
2531 if (encap) {
2532 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2533 if (err)
2534 goto out_cancel;
2535 }
2536 err = copy_to_user_policy_type(type, skb);
2537 if (err)
2538 goto out_cancel;
2539 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2540 err = copy_to_user_migrate(mp, skb);
2541 if (err)
2542 goto out_cancel;
2543 }
2544
2545 nlmsg_end(skb, nlh);
2546 return 0;
2547
2548 out_cancel:
2549 nlmsg_cancel(skb, nlh);
2550 return err;
2551 }
2552
xfrm_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)2553 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2554 const struct xfrm_migrate *m, int num_migrate,
2555 const struct xfrm_kmaddress *k,
2556 const struct xfrm_encap_tmpl *encap)
2557 {
2558 struct net *net = &init_net;
2559 struct sk_buff *skb;
2560 int err;
2561
2562 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2563 GFP_ATOMIC);
2564 if (skb == NULL)
2565 return -ENOMEM;
2566
2567 /* build migrate */
2568 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2569 BUG_ON(err < 0);
2570
2571 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2572 }
2573 #else
xfrm_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_encap_tmpl * encap)2574 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2575 const struct xfrm_migrate *m, int num_migrate,
2576 const struct xfrm_kmaddress *k,
2577 const struct xfrm_encap_tmpl *encap)
2578 {
2579 return -ENOPROTOOPT;
2580 }
2581 #endif
2582
2583 #define XMSGSIZE(type) sizeof(struct type)
2584
2585 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2586 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2587 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2588 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2589 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2590 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2591 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2592 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2593 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2594 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2595 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2596 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2597 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2598 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2599 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2600 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2601 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2602 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2603 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2604 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2605 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2606 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2607 };
2608 EXPORT_SYMBOL_GPL(xfrm_msg_min);
2609
2610 #undef XMSGSIZE
2611
2612 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2613 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2614 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2615 [XFRMA_LASTUSED] = { .type = NLA_U64},
2616 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2617 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2618 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2619 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2620 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2621 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2622 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2623 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2624 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2625 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2626 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2627 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2628 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2629 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2630 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2631 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2632 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2633 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2634 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2635 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2636 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2637 [XFRMA_PROTO] = { .type = NLA_U8 },
2638 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2639 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2640 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2641 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2642 [XFRMA_IF_ID] = { .type = NLA_U32 },
2643 };
2644 EXPORT_SYMBOL_GPL(xfrma_policy);
2645
2646 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2647 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2648 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2649 };
2650
2651 static const struct xfrm_link {
2652 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2653 int (*start)(struct netlink_callback *);
2654 int (*dump)(struct sk_buff *, struct netlink_callback *);
2655 int (*done)(struct netlink_callback *);
2656 const struct nla_policy *nla_pol;
2657 int nla_max;
2658 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2659 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2660 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2661 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2662 .dump = xfrm_dump_sa,
2663 .done = xfrm_dump_sa_done },
2664 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2665 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2666 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2667 .start = xfrm_dump_policy_start,
2668 .dump = xfrm_dump_policy,
2669 .done = xfrm_dump_policy_done },
2670 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2671 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2672 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2673 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2674 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2675 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2676 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2677 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2678 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2679 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2680 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2681 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2682 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2683 .nla_pol = xfrma_spd_policy,
2684 .nla_max = XFRMA_SPD_MAX },
2685 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2686 };
2687
xfrm_user_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)2688 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2689 struct netlink_ext_ack *extack)
2690 {
2691 struct net *net = sock_net(skb->sk);
2692 struct nlattr *attrs[XFRMA_MAX+1];
2693 const struct xfrm_link *link;
2694 struct nlmsghdr *nlh64 = NULL;
2695 int type, err;
2696
2697 type = nlh->nlmsg_type;
2698 if (type > XFRM_MSG_MAX)
2699 return -EINVAL;
2700
2701 type -= XFRM_MSG_BASE;
2702 link = &xfrm_dispatch[type];
2703
2704 /* All operations require privileges, even GET */
2705 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2706 return -EPERM;
2707
2708 if (in_compat_syscall()) {
2709 struct xfrm_translator *xtr = xfrm_get_translator();
2710
2711 if (!xtr)
2712 return -EOPNOTSUPP;
2713
2714 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
2715 link->nla_pol, extack);
2716 xfrm_put_translator(xtr);
2717 if (IS_ERR(nlh64))
2718 return PTR_ERR(nlh64);
2719 if (nlh64)
2720 nlh = nlh64;
2721 }
2722
2723 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2724 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2725 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2726 struct netlink_dump_control c = {
2727 .start = link->start,
2728 .dump = link->dump,
2729 .done = link->done,
2730 };
2731
2732 if (link->dump == NULL) {
2733 err = -EINVAL;
2734 goto err;
2735 }
2736
2737 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2738 goto err;
2739 }
2740
2741 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2742 link->nla_max ? : XFRMA_MAX,
2743 link->nla_pol ? : xfrma_policy, extack);
2744 if (err < 0)
2745 goto err;
2746
2747 if (link->doit == NULL) {
2748 err = -EINVAL;
2749 goto err;
2750 }
2751
2752 err = link->doit(skb, nlh, attrs);
2753
2754 err:
2755 kvfree(nlh64);
2756 return err;
2757 }
2758
xfrm_netlink_rcv(struct sk_buff * skb)2759 static void xfrm_netlink_rcv(struct sk_buff *skb)
2760 {
2761 struct net *net = sock_net(skb->sk);
2762
2763 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2764 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2765 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2766 }
2767
xfrm_expire_msgsize(void)2768 static inline unsigned int xfrm_expire_msgsize(void)
2769 {
2770 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2771 + nla_total_size(sizeof(struct xfrm_mark));
2772 }
2773
build_expire(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2774 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2775 {
2776 struct xfrm_user_expire *ue;
2777 struct nlmsghdr *nlh;
2778 int err;
2779
2780 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2781 if (nlh == NULL)
2782 return -EMSGSIZE;
2783
2784 ue = nlmsg_data(nlh);
2785 copy_to_user_state(x, &ue->state);
2786 ue->hard = (c->data.hard != 0) ? 1 : 0;
2787 /* clear the padding bytes */
2788 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2789
2790 err = xfrm_mark_put(skb, &x->mark);
2791 if (err)
2792 return err;
2793
2794 err = xfrm_if_id_put(skb, x->if_id);
2795 if (err)
2796 return err;
2797
2798 nlmsg_end(skb, nlh);
2799 return 0;
2800 }
2801
xfrm_exp_state_notify(struct xfrm_state * x,const struct km_event * c)2802 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2803 {
2804 struct net *net = xs_net(x);
2805 struct sk_buff *skb;
2806
2807 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2808 if (skb == NULL)
2809 return -ENOMEM;
2810
2811 if (build_expire(skb, x, c) < 0) {
2812 kfree_skb(skb);
2813 return -EMSGSIZE;
2814 }
2815
2816 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2817 }
2818
xfrm_aevent_state_notify(struct xfrm_state * x,const struct km_event * c)2819 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2820 {
2821 struct net *net = xs_net(x);
2822 struct sk_buff *skb;
2823 int err;
2824
2825 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2826 if (skb == NULL)
2827 return -ENOMEM;
2828
2829 err = build_aevent(skb, x, c);
2830 BUG_ON(err < 0);
2831
2832 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2833 }
2834
xfrm_notify_sa_flush(const struct km_event * c)2835 static int xfrm_notify_sa_flush(const struct km_event *c)
2836 {
2837 struct net *net = c->net;
2838 struct xfrm_usersa_flush *p;
2839 struct nlmsghdr *nlh;
2840 struct sk_buff *skb;
2841 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2842
2843 skb = nlmsg_new(len, GFP_ATOMIC);
2844 if (skb == NULL)
2845 return -ENOMEM;
2846
2847 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2848 if (nlh == NULL) {
2849 kfree_skb(skb);
2850 return -EMSGSIZE;
2851 }
2852
2853 p = nlmsg_data(nlh);
2854 p->proto = c->data.proto;
2855
2856 nlmsg_end(skb, nlh);
2857
2858 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2859 }
2860
xfrm_sa_len(struct xfrm_state * x)2861 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2862 {
2863 unsigned int l = 0;
2864 if (x->aead)
2865 l += nla_total_size(aead_len(x->aead));
2866 if (x->aalg) {
2867 l += nla_total_size(sizeof(struct xfrm_algo) +
2868 (x->aalg->alg_key_len + 7) / 8);
2869 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2870 }
2871 if (x->ealg)
2872 l += nla_total_size(xfrm_alg_len(x->ealg));
2873 if (x->calg)
2874 l += nla_total_size(sizeof(*x->calg));
2875 if (x->encap)
2876 l += nla_total_size(sizeof(*x->encap));
2877 if (x->tfcpad)
2878 l += nla_total_size(sizeof(x->tfcpad));
2879 if (x->replay_esn)
2880 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2881 else
2882 l += nla_total_size(sizeof(struct xfrm_replay_state));
2883 if (x->security)
2884 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2885 x->security->ctx_len);
2886 if (x->coaddr)
2887 l += nla_total_size(sizeof(*x->coaddr));
2888 if (x->props.extra_flags)
2889 l += nla_total_size(sizeof(x->props.extra_flags));
2890 if (x->xso.dev)
2891 l += nla_total_size(sizeof(x->xso));
2892 if (x->props.smark.v | x->props.smark.m) {
2893 l += nla_total_size(sizeof(x->props.smark.v));
2894 l += nla_total_size(sizeof(x->props.smark.m));
2895 }
2896 if (x->if_id)
2897 l += nla_total_size(sizeof(x->if_id));
2898
2899 /* Must count x->lastused as it may become non-zero behind our back. */
2900 l += nla_total_size_64bit(sizeof(u64));
2901
2902 return l;
2903 }
2904
xfrm_notify_sa(struct xfrm_state * x,const struct km_event * c)2905 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2906 {
2907 struct net *net = xs_net(x);
2908 struct xfrm_usersa_info *p;
2909 struct xfrm_usersa_id *id;
2910 struct nlmsghdr *nlh;
2911 struct sk_buff *skb;
2912 unsigned int len = xfrm_sa_len(x);
2913 unsigned int headlen;
2914 int err;
2915
2916 headlen = sizeof(*p);
2917 if (c->event == XFRM_MSG_DELSA) {
2918 len += nla_total_size(headlen);
2919 headlen = sizeof(*id);
2920 len += nla_total_size(sizeof(struct xfrm_mark));
2921 }
2922 len += NLMSG_ALIGN(headlen);
2923
2924 skb = nlmsg_new(len, GFP_ATOMIC);
2925 if (skb == NULL)
2926 return -ENOMEM;
2927
2928 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2929 err = -EMSGSIZE;
2930 if (nlh == NULL)
2931 goto out_free_skb;
2932
2933 p = nlmsg_data(nlh);
2934 if (c->event == XFRM_MSG_DELSA) {
2935 struct nlattr *attr;
2936
2937 id = nlmsg_data(nlh);
2938 memset(id, 0, sizeof(*id));
2939 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2940 id->spi = x->id.spi;
2941 id->family = x->props.family;
2942 id->proto = x->id.proto;
2943
2944 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2945 err = -EMSGSIZE;
2946 if (attr == NULL)
2947 goto out_free_skb;
2948
2949 p = nla_data(attr);
2950 }
2951 err = copy_to_user_state_extra(x, p, skb);
2952 if (err)
2953 goto out_free_skb;
2954
2955 nlmsg_end(skb, nlh);
2956
2957 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2958
2959 out_free_skb:
2960 kfree_skb(skb);
2961 return err;
2962 }
2963
xfrm_send_state_notify(struct xfrm_state * x,const struct km_event * c)2964 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2965 {
2966
2967 switch (c->event) {
2968 case XFRM_MSG_EXPIRE:
2969 return xfrm_exp_state_notify(x, c);
2970 case XFRM_MSG_NEWAE:
2971 return xfrm_aevent_state_notify(x, c);
2972 case XFRM_MSG_DELSA:
2973 case XFRM_MSG_UPDSA:
2974 case XFRM_MSG_NEWSA:
2975 return xfrm_notify_sa(x, c);
2976 case XFRM_MSG_FLUSHSA:
2977 return xfrm_notify_sa_flush(c);
2978 default:
2979 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2980 c->event);
2981 break;
2982 }
2983
2984 return 0;
2985
2986 }
2987
xfrm_acquire_msgsize(struct xfrm_state * x,struct xfrm_policy * xp)2988 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2989 struct xfrm_policy *xp)
2990 {
2991 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2992 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2993 + nla_total_size(sizeof(struct xfrm_mark))
2994 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2995 + userpolicy_type_attrsize();
2996 }
2997
build_acquire(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)2998 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2999 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3000 {
3001 __u32 seq = xfrm_get_acqseq();
3002 struct xfrm_user_acquire *ua;
3003 struct nlmsghdr *nlh;
3004 int err;
3005
3006 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3007 if (nlh == NULL)
3008 return -EMSGSIZE;
3009
3010 ua = nlmsg_data(nlh);
3011 memcpy(&ua->id, &x->id, sizeof(ua->id));
3012 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3013 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3014 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3015 ua->aalgos = xt->aalgos;
3016 ua->ealgos = xt->ealgos;
3017 ua->calgos = xt->calgos;
3018 ua->seq = x->km.seq = seq;
3019
3020 err = copy_to_user_tmpl(xp, skb);
3021 if (!err)
3022 err = copy_to_user_state_sec_ctx(x, skb);
3023 if (!err)
3024 err = copy_to_user_policy_type(xp->type, skb);
3025 if (!err)
3026 err = xfrm_mark_put(skb, &xp->mark);
3027 if (!err)
3028 err = xfrm_if_id_put(skb, xp->if_id);
3029 if (err) {
3030 nlmsg_cancel(skb, nlh);
3031 return err;
3032 }
3033
3034 nlmsg_end(skb, nlh);
3035 return 0;
3036 }
3037
xfrm_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3038 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3039 struct xfrm_policy *xp)
3040 {
3041 struct net *net = xs_net(x);
3042 struct sk_buff *skb;
3043 int err;
3044
3045 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3046 if (skb == NULL)
3047 return -ENOMEM;
3048
3049 err = build_acquire(skb, x, xt, xp);
3050 BUG_ON(err < 0);
3051
3052 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3053 }
3054
3055 /* User gives us xfrm_user_policy_info followed by an array of 0
3056 * or more templates.
3057 */
xfrm_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3058 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3059 u8 *data, int len, int *dir)
3060 {
3061 struct net *net = sock_net(sk);
3062 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3063 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3064 struct xfrm_policy *xp;
3065 int nr;
3066
3067 switch (sk->sk_family) {
3068 case AF_INET:
3069 if (opt != IP_XFRM_POLICY) {
3070 *dir = -EOPNOTSUPP;
3071 return NULL;
3072 }
3073 break;
3074 #if IS_ENABLED(CONFIG_IPV6)
3075 case AF_INET6:
3076 if (opt != IPV6_XFRM_POLICY) {
3077 *dir = -EOPNOTSUPP;
3078 return NULL;
3079 }
3080 break;
3081 #endif
3082 default:
3083 *dir = -EINVAL;
3084 return NULL;
3085 }
3086
3087 *dir = -EINVAL;
3088
3089 if (len < sizeof(*p) ||
3090 verify_newpolicy_info(p))
3091 return NULL;
3092
3093 nr = ((len - sizeof(*p)) / sizeof(*ut));
3094 if (validate_tmpl(nr, ut, p->sel.family))
3095 return NULL;
3096
3097 if (p->dir > XFRM_POLICY_OUT)
3098 return NULL;
3099
3100 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3101 if (xp == NULL) {
3102 *dir = -ENOBUFS;
3103 return NULL;
3104 }
3105
3106 copy_from_user_policy(xp, p);
3107 xp->type = XFRM_POLICY_TYPE_MAIN;
3108 copy_templates(xp, ut, nr);
3109
3110 *dir = p->dir;
3111
3112 return xp;
3113 }
3114
xfrm_polexpire_msgsize(struct xfrm_policy * xp)3115 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3116 {
3117 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3118 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3119 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3120 + nla_total_size(sizeof(struct xfrm_mark))
3121 + userpolicy_type_attrsize();
3122 }
3123
build_polexpire(struct sk_buff * skb,struct xfrm_policy * xp,int dir,const struct km_event * c)3124 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3125 int dir, const struct km_event *c)
3126 {
3127 struct xfrm_user_polexpire *upe;
3128 int hard = c->data.hard;
3129 struct nlmsghdr *nlh;
3130 int err;
3131
3132 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3133 if (nlh == NULL)
3134 return -EMSGSIZE;
3135
3136 upe = nlmsg_data(nlh);
3137 copy_to_user_policy(xp, &upe->pol, dir);
3138 err = copy_to_user_tmpl(xp, skb);
3139 if (!err)
3140 err = copy_to_user_sec_ctx(xp, skb);
3141 if (!err)
3142 err = copy_to_user_policy_type(xp->type, skb);
3143 if (!err)
3144 err = xfrm_mark_put(skb, &xp->mark);
3145 if (!err)
3146 err = xfrm_if_id_put(skb, xp->if_id);
3147 if (err) {
3148 nlmsg_cancel(skb, nlh);
3149 return err;
3150 }
3151 upe->hard = !!hard;
3152
3153 nlmsg_end(skb, nlh);
3154 return 0;
3155 }
3156
xfrm_exp_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3157 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3158 {
3159 struct net *net = xp_net(xp);
3160 struct sk_buff *skb;
3161 int err;
3162
3163 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3164 if (skb == NULL)
3165 return -ENOMEM;
3166
3167 err = build_polexpire(skb, xp, dir, c);
3168 BUG_ON(err < 0);
3169
3170 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3171 }
3172
xfrm_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)3173 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3174 {
3175 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3176 struct net *net = xp_net(xp);
3177 struct xfrm_userpolicy_info *p;
3178 struct xfrm_userpolicy_id *id;
3179 struct nlmsghdr *nlh;
3180 struct sk_buff *skb;
3181 unsigned int headlen;
3182 int err;
3183
3184 headlen = sizeof(*p);
3185 if (c->event == XFRM_MSG_DELPOLICY) {
3186 len += nla_total_size(headlen);
3187 headlen = sizeof(*id);
3188 }
3189 len += userpolicy_type_attrsize();
3190 len += nla_total_size(sizeof(struct xfrm_mark));
3191 len += NLMSG_ALIGN(headlen);
3192
3193 skb = nlmsg_new(len, GFP_ATOMIC);
3194 if (skb == NULL)
3195 return -ENOMEM;
3196
3197 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3198 err = -EMSGSIZE;
3199 if (nlh == NULL)
3200 goto out_free_skb;
3201
3202 p = nlmsg_data(nlh);
3203 if (c->event == XFRM_MSG_DELPOLICY) {
3204 struct nlattr *attr;
3205
3206 id = nlmsg_data(nlh);
3207 memset(id, 0, sizeof(*id));
3208 id->dir = dir;
3209 if (c->data.byid)
3210 id->index = xp->index;
3211 else
3212 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3213
3214 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3215 err = -EMSGSIZE;
3216 if (attr == NULL)
3217 goto out_free_skb;
3218
3219 p = nla_data(attr);
3220 }
3221
3222 copy_to_user_policy(xp, p, dir);
3223 err = copy_to_user_tmpl(xp, skb);
3224 if (!err)
3225 err = copy_to_user_policy_type(xp->type, skb);
3226 if (!err)
3227 err = xfrm_mark_put(skb, &xp->mark);
3228 if (!err)
3229 err = xfrm_if_id_put(skb, xp->if_id);
3230 if (err)
3231 goto out_free_skb;
3232
3233 nlmsg_end(skb, nlh);
3234
3235 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3236
3237 out_free_skb:
3238 kfree_skb(skb);
3239 return err;
3240 }
3241
xfrm_notify_policy_flush(const struct km_event * c)3242 static int xfrm_notify_policy_flush(const struct km_event *c)
3243 {
3244 struct net *net = c->net;
3245 struct nlmsghdr *nlh;
3246 struct sk_buff *skb;
3247 int err;
3248
3249 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3250 if (skb == NULL)
3251 return -ENOMEM;
3252
3253 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3254 err = -EMSGSIZE;
3255 if (nlh == NULL)
3256 goto out_free_skb;
3257 err = copy_to_user_policy_type(c->data.type, skb);
3258 if (err)
3259 goto out_free_skb;
3260
3261 nlmsg_end(skb, nlh);
3262
3263 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3264
3265 out_free_skb:
3266 kfree_skb(skb);
3267 return err;
3268 }
3269
xfrm_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3270 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3271 {
3272
3273 switch (c->event) {
3274 case XFRM_MSG_NEWPOLICY:
3275 case XFRM_MSG_UPDPOLICY:
3276 case XFRM_MSG_DELPOLICY:
3277 return xfrm_notify_policy(xp, dir, c);
3278 case XFRM_MSG_FLUSHPOLICY:
3279 return xfrm_notify_policy_flush(c);
3280 case XFRM_MSG_POLEXPIRE:
3281 return xfrm_exp_policy_notify(xp, dir, c);
3282 default:
3283 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3284 c->event);
3285 }
3286
3287 return 0;
3288
3289 }
3290
xfrm_report_msgsize(void)3291 static inline unsigned int xfrm_report_msgsize(void)
3292 {
3293 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3294 }
3295
build_report(struct sk_buff * skb,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3296 static int build_report(struct sk_buff *skb, u8 proto,
3297 struct xfrm_selector *sel, xfrm_address_t *addr)
3298 {
3299 struct xfrm_user_report *ur;
3300 struct nlmsghdr *nlh;
3301
3302 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3303 if (nlh == NULL)
3304 return -EMSGSIZE;
3305
3306 ur = nlmsg_data(nlh);
3307 ur->proto = proto;
3308 memcpy(&ur->sel, sel, sizeof(ur->sel));
3309
3310 if (addr) {
3311 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3312 if (err) {
3313 nlmsg_cancel(skb, nlh);
3314 return err;
3315 }
3316 }
3317 nlmsg_end(skb, nlh);
3318 return 0;
3319 }
3320
xfrm_send_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3321 static int xfrm_send_report(struct net *net, u8 proto,
3322 struct xfrm_selector *sel, xfrm_address_t *addr)
3323 {
3324 struct sk_buff *skb;
3325 int err;
3326
3327 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3328 if (skb == NULL)
3329 return -ENOMEM;
3330
3331 err = build_report(skb, proto, sel, addr);
3332 BUG_ON(err < 0);
3333
3334 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3335 }
3336
xfrm_mapping_msgsize(void)3337 static inline unsigned int xfrm_mapping_msgsize(void)
3338 {
3339 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3340 }
3341
build_mapping(struct sk_buff * skb,struct xfrm_state * x,xfrm_address_t * new_saddr,__be16 new_sport)3342 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3343 xfrm_address_t *new_saddr, __be16 new_sport)
3344 {
3345 struct xfrm_user_mapping *um;
3346 struct nlmsghdr *nlh;
3347
3348 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3349 if (nlh == NULL)
3350 return -EMSGSIZE;
3351
3352 um = nlmsg_data(nlh);
3353
3354 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3355 um->id.spi = x->id.spi;
3356 um->id.family = x->props.family;
3357 um->id.proto = x->id.proto;
3358 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3359 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3360 um->new_sport = new_sport;
3361 um->old_sport = x->encap->encap_sport;
3362 um->reqid = x->props.reqid;
3363
3364 nlmsg_end(skb, nlh);
3365 return 0;
3366 }
3367
xfrm_send_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)3368 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3369 __be16 sport)
3370 {
3371 struct net *net = xs_net(x);
3372 struct sk_buff *skb;
3373 int err;
3374
3375 if (x->id.proto != IPPROTO_ESP)
3376 return -EINVAL;
3377
3378 if (!x->encap)
3379 return -EINVAL;
3380
3381 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3382 if (skb == NULL)
3383 return -ENOMEM;
3384
3385 err = build_mapping(skb, x, ipaddr, sport);
3386 BUG_ON(err < 0);
3387
3388 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3389 }
3390
xfrm_is_alive(const struct km_event * c)3391 static bool xfrm_is_alive(const struct km_event *c)
3392 {
3393 return (bool)xfrm_acquire_is_on(c->net);
3394 }
3395
3396 static struct xfrm_mgr netlink_mgr = {
3397 .notify = xfrm_send_state_notify,
3398 .acquire = xfrm_send_acquire,
3399 .compile_policy = xfrm_compile_policy,
3400 .notify_policy = xfrm_send_policy_notify,
3401 .report = xfrm_send_report,
3402 .migrate = xfrm_send_migrate,
3403 .new_mapping = xfrm_send_mapping,
3404 .is_alive = xfrm_is_alive,
3405 };
3406
xfrm_user_net_init(struct net * net)3407 static int __net_init xfrm_user_net_init(struct net *net)
3408 {
3409 struct sock *nlsk;
3410 struct netlink_kernel_cfg cfg = {
3411 .groups = XFRMNLGRP_MAX,
3412 .input = xfrm_netlink_rcv,
3413 };
3414
3415 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3416 if (nlsk == NULL)
3417 return -ENOMEM;
3418 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3419 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3420 return 0;
3421 }
3422
xfrm_user_net_exit(struct list_head * net_exit_list)3423 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3424 {
3425 struct net *net;
3426 list_for_each_entry(net, net_exit_list, exit_list)
3427 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3428 synchronize_net();
3429 list_for_each_entry(net, net_exit_list, exit_list)
3430 netlink_kernel_release(net->xfrm.nlsk_stash);
3431 }
3432
3433 static struct pernet_operations xfrm_user_net_ops = {
3434 .init = xfrm_user_net_init,
3435 .exit_batch = xfrm_user_net_exit,
3436 };
3437
xfrm_user_init(void)3438 static int __init xfrm_user_init(void)
3439 {
3440 int rv;
3441
3442 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3443
3444 rv = register_pernet_subsys(&xfrm_user_net_ops);
3445 if (rv < 0)
3446 return rv;
3447 rv = xfrm_register_km(&netlink_mgr);
3448 if (rv < 0)
3449 unregister_pernet_subsys(&xfrm_user_net_ops);
3450 return rv;
3451 }
3452
xfrm_user_exit(void)3453 static void __exit xfrm_user_exit(void)
3454 {
3455 xfrm_unregister_km(&netlink_mgr);
3456 unregister_pernet_subsys(&xfrm_user_net_ops);
3457 }
3458
3459 module_init(xfrm_user_init);
3460 module_exit(xfrm_user_exit);
3461 MODULE_LICENSE("GPL");
3462 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3463