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 u16 family = p->sel.family;
153
154 err = -EINVAL;
155 switch (p->family) {
156 case AF_INET:
157 break;
158
159 case AF_INET6:
160 #if IS_ENABLED(CONFIG_IPV6)
161 break;
162 #else
163 err = -EAFNOSUPPORT;
164 goto out;
165 #endif
166
167 default:
168 goto out;
169 }
170
171 if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
172 family = p->family;
173
174 switch (family) {
175 case AF_UNSPEC:
176 break;
177
178 case AF_INET:
179 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
180 goto out;
181
182 break;
183
184 case AF_INET6:
185 #if IS_ENABLED(CONFIG_IPV6)
186 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
187 goto out;
188
189 break;
190 #else
191 err = -EAFNOSUPPORT;
192 goto out;
193 #endif
194
195 default:
196 goto out;
197 }
198
199 err = -EINVAL;
200 switch (p->id.proto) {
201 case IPPROTO_AH:
202 if ((!attrs[XFRMA_ALG_AUTH] &&
203 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
204 attrs[XFRMA_ALG_AEAD] ||
205 attrs[XFRMA_ALG_CRYPT] ||
206 attrs[XFRMA_ALG_COMP] ||
207 attrs[XFRMA_TFCPAD])
208 goto out;
209 break;
210
211 case IPPROTO_ESP:
212 if (attrs[XFRMA_ALG_COMP])
213 goto out;
214 if (!attrs[XFRMA_ALG_AUTH] &&
215 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
216 !attrs[XFRMA_ALG_CRYPT] &&
217 !attrs[XFRMA_ALG_AEAD])
218 goto out;
219 if ((attrs[XFRMA_ALG_AUTH] ||
220 attrs[XFRMA_ALG_AUTH_TRUNC] ||
221 attrs[XFRMA_ALG_CRYPT]) &&
222 attrs[XFRMA_ALG_AEAD])
223 goto out;
224 if (attrs[XFRMA_TFCPAD] &&
225 p->mode != XFRM_MODE_TUNNEL)
226 goto out;
227 break;
228
229 case IPPROTO_COMP:
230 if (!attrs[XFRMA_ALG_COMP] ||
231 attrs[XFRMA_ALG_AEAD] ||
232 attrs[XFRMA_ALG_AUTH] ||
233 attrs[XFRMA_ALG_AUTH_TRUNC] ||
234 attrs[XFRMA_ALG_CRYPT] ||
235 attrs[XFRMA_TFCPAD] ||
236 (ntohl(p->id.spi) >= 0x10000))
237 goto out;
238 break;
239
240 #if IS_ENABLED(CONFIG_IPV6)
241 case IPPROTO_DSTOPTS:
242 case IPPROTO_ROUTING:
243 if (attrs[XFRMA_ALG_COMP] ||
244 attrs[XFRMA_ALG_AUTH] ||
245 attrs[XFRMA_ALG_AUTH_TRUNC] ||
246 attrs[XFRMA_ALG_AEAD] ||
247 attrs[XFRMA_ALG_CRYPT] ||
248 attrs[XFRMA_ENCAP] ||
249 attrs[XFRMA_SEC_CTX] ||
250 attrs[XFRMA_TFCPAD] ||
251 !attrs[XFRMA_COADDR])
252 goto out;
253 break;
254 #endif
255
256 default:
257 goto out;
258 }
259
260 if ((err = verify_aead(attrs)))
261 goto out;
262 if ((err = verify_auth_trunc(attrs)))
263 goto out;
264 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
265 goto out;
266 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
267 goto out;
268 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
269 goto out;
270 if ((err = verify_sec_ctx_len(attrs)))
271 goto out;
272 if ((err = verify_replay(p, attrs)))
273 goto out;
274
275 err = -EINVAL;
276 switch (p->mode) {
277 case XFRM_MODE_TRANSPORT:
278 case XFRM_MODE_TUNNEL:
279 case XFRM_MODE_ROUTEOPTIMIZATION:
280 case XFRM_MODE_BEET:
281 break;
282
283 default:
284 goto out;
285 }
286
287 err = 0;
288
289 if (attrs[XFRMA_MTIMER_THRESH])
290 if (!attrs[XFRMA_ENCAP])
291 err = -EINVAL;
292
293 out:
294 return err;
295 }
296
attach_one_algo(struct xfrm_algo ** algpp,u8 * props,struct xfrm_algo_desc * (* get_byname)(const char *,int),struct nlattr * rta)297 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
298 struct xfrm_algo_desc *(*get_byname)(const char *, int),
299 struct nlattr *rta)
300 {
301 struct xfrm_algo *p, *ualg;
302 struct xfrm_algo_desc *algo;
303
304 if (!rta)
305 return 0;
306
307 ualg = nla_data(rta);
308
309 algo = get_byname(ualg->alg_name, 1);
310 if (!algo)
311 return -ENOSYS;
312 *props = algo->desc.sadb_alg_id;
313
314 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
315 if (!p)
316 return -ENOMEM;
317
318 strcpy(p->alg_name, algo->name);
319 *algpp = p;
320 return 0;
321 }
322
attach_crypt(struct xfrm_state * x,struct nlattr * rta)323 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
324 {
325 struct xfrm_algo *p, *ualg;
326 struct xfrm_algo_desc *algo;
327
328 if (!rta)
329 return 0;
330
331 ualg = nla_data(rta);
332
333 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
334 if (!algo)
335 return -ENOSYS;
336 x->props.ealgo = algo->desc.sadb_alg_id;
337
338 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
339 if (!p)
340 return -ENOMEM;
341
342 strcpy(p->alg_name, algo->name);
343 x->ealg = p;
344 x->geniv = algo->uinfo.encr.geniv;
345 return 0;
346 }
347
attach_auth(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta)348 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
349 struct nlattr *rta)
350 {
351 struct xfrm_algo *ualg;
352 struct xfrm_algo_auth *p;
353 struct xfrm_algo_desc *algo;
354
355 if (!rta)
356 return 0;
357
358 ualg = nla_data(rta);
359
360 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
361 if (!algo)
362 return -ENOSYS;
363 *props = algo->desc.sadb_alg_id;
364
365 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
366 if (!p)
367 return -ENOMEM;
368
369 strcpy(p->alg_name, algo->name);
370 p->alg_key_len = ualg->alg_key_len;
371 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
372 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
373
374 *algpp = p;
375 return 0;
376 }
377
attach_auth_trunc(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta)378 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
379 struct nlattr *rta)
380 {
381 struct xfrm_algo_auth *p, *ualg;
382 struct xfrm_algo_desc *algo;
383
384 if (!rta)
385 return 0;
386
387 ualg = nla_data(rta);
388
389 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
390 if (!algo)
391 return -ENOSYS;
392 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
393 return -EINVAL;
394 *props = algo->desc.sadb_alg_id;
395
396 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
397 if (!p)
398 return -ENOMEM;
399
400 strcpy(p->alg_name, algo->name);
401 if (!p->alg_trunc_len)
402 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
403
404 *algpp = p;
405 return 0;
406 }
407
attach_aead(struct xfrm_state * x,struct nlattr * rta)408 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
409 {
410 struct xfrm_algo_aead *p, *ualg;
411 struct xfrm_algo_desc *algo;
412
413 if (!rta)
414 return 0;
415
416 ualg = nla_data(rta);
417
418 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
419 if (!algo)
420 return -ENOSYS;
421 x->props.ealgo = algo->desc.sadb_alg_id;
422
423 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
424 if (!p)
425 return -ENOMEM;
426
427 strcpy(p->alg_name, algo->name);
428 x->aead = p;
429 x->geniv = algo->uinfo.aead.geniv;
430 return 0;
431 }
432
xfrm_replay_verify_len(struct xfrm_replay_state_esn * replay_esn,struct nlattr * rp)433 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
434 struct nlattr *rp)
435 {
436 struct xfrm_replay_state_esn *up;
437 unsigned int ulen;
438
439 if (!replay_esn || !rp)
440 return 0;
441
442 up = nla_data(rp);
443 ulen = xfrm_replay_state_esn_len(up);
444
445 /* Check the overall length and the internal bitmap length to avoid
446 * potential overflow. */
447 if (nla_len(rp) < (int)ulen ||
448 xfrm_replay_state_esn_len(replay_esn) != ulen ||
449 replay_esn->bmp_len != up->bmp_len)
450 return -EINVAL;
451
452 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
453 return -EINVAL;
454
455 return 0;
456 }
457
xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn ** replay_esn,struct xfrm_replay_state_esn ** preplay_esn,struct nlattr * rta)458 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
459 struct xfrm_replay_state_esn **preplay_esn,
460 struct nlattr *rta)
461 {
462 struct xfrm_replay_state_esn *p, *pp, *up;
463 unsigned int klen, ulen;
464
465 if (!rta)
466 return 0;
467
468 up = nla_data(rta);
469 klen = xfrm_replay_state_esn_len(up);
470 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
471
472 p = kzalloc(klen, GFP_KERNEL);
473 if (!p)
474 return -ENOMEM;
475
476 pp = kzalloc(klen, GFP_KERNEL);
477 if (!pp) {
478 kfree(p);
479 return -ENOMEM;
480 }
481
482 memcpy(p, up, ulen);
483 memcpy(pp, up, ulen);
484
485 *replay_esn = p;
486 *preplay_esn = pp;
487
488 return 0;
489 }
490
xfrm_user_sec_ctx_size(struct xfrm_sec_ctx * xfrm_ctx)491 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
492 {
493 unsigned int len = 0;
494
495 if (xfrm_ctx) {
496 len += sizeof(struct xfrm_user_sec_ctx);
497 len += xfrm_ctx->ctx_len;
498 }
499 return len;
500 }
501
copy_from_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)502 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
503 {
504 memcpy(&x->id, &p->id, sizeof(x->id));
505 memcpy(&x->sel, &p->sel, sizeof(x->sel));
506 memcpy(&x->lft, &p->lft, sizeof(x->lft));
507 x->props.mode = p->mode;
508 x->props.replay_window = min_t(unsigned int, p->replay_window,
509 sizeof(x->replay.bitmap) * 8);
510 x->props.reqid = p->reqid;
511 x->props.family = p->family;
512 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
513 x->props.flags = p->flags;
514
515 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
516 x->sel.family = p->family;
517 }
518
519 /*
520 * someday when pfkey also has support, we could have the code
521 * somehow made shareable and move it to xfrm_state.c - JHS
522 *
523 */
xfrm_update_ae_params(struct xfrm_state * x,struct nlattr ** attrs,int update_esn)524 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
525 int update_esn)
526 {
527 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
528 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
529 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
530 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
531 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
532 struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH];
533
534 if (re && x->replay_esn && x->preplay_esn) {
535 struct xfrm_replay_state_esn *replay_esn;
536 replay_esn = nla_data(re);
537 memcpy(x->replay_esn, replay_esn,
538 xfrm_replay_state_esn_len(replay_esn));
539 memcpy(x->preplay_esn, replay_esn,
540 xfrm_replay_state_esn_len(replay_esn));
541 }
542
543 if (rp) {
544 struct xfrm_replay_state *replay;
545 replay = nla_data(rp);
546 memcpy(&x->replay, replay, sizeof(*replay));
547 memcpy(&x->preplay, replay, sizeof(*replay));
548 }
549
550 if (lt) {
551 struct xfrm_lifetime_cur *ltime;
552 ltime = nla_data(lt);
553 x->curlft.bytes = ltime->bytes;
554 x->curlft.packets = ltime->packets;
555 x->curlft.add_time = ltime->add_time;
556 x->curlft.use_time = ltime->use_time;
557 }
558
559 if (et)
560 x->replay_maxage = nla_get_u32(et);
561
562 if (rt)
563 x->replay_maxdiff = nla_get_u32(rt);
564
565 if (mt)
566 x->mapping_maxage = nla_get_u32(mt);
567 }
568
xfrm_smark_init(struct nlattr ** attrs,struct xfrm_mark * m)569 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
570 {
571 if (attrs[XFRMA_SET_MARK]) {
572 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
573 if (attrs[XFRMA_SET_MARK_MASK])
574 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
575 else
576 m->m = 0xffffffff;
577 } else {
578 m->v = m->m = 0;
579 }
580 }
581
xfrm_state_construct(struct net * net,struct xfrm_usersa_info * p,struct nlattr ** attrs,int * errp)582 static struct xfrm_state *xfrm_state_construct(struct net *net,
583 struct xfrm_usersa_info *p,
584 struct nlattr **attrs,
585 int *errp)
586 {
587 struct xfrm_state *x = xfrm_state_alloc(net);
588 int err = -ENOMEM;
589
590 if (!x)
591 goto error_no_put;
592
593 copy_from_user_state(x, p);
594
595 if (attrs[XFRMA_ENCAP]) {
596 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
597 sizeof(*x->encap), GFP_KERNEL);
598 if (x->encap == NULL)
599 goto error;
600 }
601
602 if (attrs[XFRMA_COADDR]) {
603 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
604 sizeof(*x->coaddr), GFP_KERNEL);
605 if (x->coaddr == NULL)
606 goto error;
607 }
608
609 if (attrs[XFRMA_SA_EXTRA_FLAGS])
610 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
611
612 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
613 goto error;
614 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
615 attrs[XFRMA_ALG_AUTH_TRUNC])))
616 goto error;
617 if (!x->props.aalgo) {
618 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
619 attrs[XFRMA_ALG_AUTH])))
620 goto error;
621 }
622 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
623 goto error;
624 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
625 xfrm_calg_get_byname,
626 attrs[XFRMA_ALG_COMP])))
627 goto error;
628
629 if (attrs[XFRMA_TFCPAD])
630 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
631
632 xfrm_mark_get(attrs, &x->mark);
633
634 xfrm_smark_init(attrs, &x->props.smark);
635
636 if (attrs[XFRMA_IF_ID])
637 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
638
639 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
640 if (err)
641 goto error;
642
643 if (attrs[XFRMA_SEC_CTX]) {
644 err = security_xfrm_state_alloc(x,
645 nla_data(attrs[XFRMA_SEC_CTX]));
646 if (err)
647 goto error;
648 }
649
650 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
651 attrs[XFRMA_REPLAY_ESN_VAL])))
652 goto error;
653
654 x->km.seq = p->seq;
655 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
656 /* sysctl_xfrm_aevent_etime is in 100ms units */
657 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
658
659 if ((err = xfrm_init_replay(x)))
660 goto error;
661
662 /* override default values from above */
663 xfrm_update_ae_params(x, attrs, 0);
664
665 /* configure the hardware if offload is requested */
666 if (attrs[XFRMA_OFFLOAD_DEV]) {
667 err = xfrm_dev_state_add(net, x,
668 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
669 if (err)
670 goto error;
671 }
672
673 return x;
674
675 error:
676 x->km.state = XFRM_STATE_DEAD;
677 xfrm_state_put(x);
678 error_no_put:
679 *errp = err;
680 return NULL;
681 }
682
xfrm_add_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)683 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
684 struct nlattr **attrs)
685 {
686 struct net *net = sock_net(skb->sk);
687 struct xfrm_usersa_info *p = nlmsg_data(nlh);
688 struct xfrm_state *x;
689 int err;
690 struct km_event c;
691
692 err = verify_newsa_info(p, attrs);
693 if (err)
694 return err;
695
696 x = xfrm_state_construct(net, p, attrs, &err);
697 if (!x)
698 return err;
699
700 xfrm_state_hold(x);
701 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
702 err = xfrm_state_add(x);
703 else
704 err = xfrm_state_update(x);
705
706 xfrm_audit_state_add(x, err ? 0 : 1, true);
707
708 if (err < 0) {
709 x->km.state = XFRM_STATE_DEAD;
710 xfrm_dev_state_delete(x);
711 __xfrm_state_put(x);
712 goto out;
713 }
714
715 if (x->km.state == XFRM_STATE_VOID)
716 x->km.state = XFRM_STATE_VALID;
717
718 c.seq = nlh->nlmsg_seq;
719 c.portid = nlh->nlmsg_pid;
720 c.event = nlh->nlmsg_type;
721
722 km_state_notify(x, &c);
723 out:
724 xfrm_state_put(x);
725 return err;
726 }
727
xfrm_user_state_lookup(struct net * net,struct xfrm_usersa_id * p,struct nlattr ** attrs,int * errp)728 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
729 struct xfrm_usersa_id *p,
730 struct nlattr **attrs,
731 int *errp)
732 {
733 struct xfrm_state *x = NULL;
734 struct xfrm_mark m;
735 int err;
736 u32 mark = xfrm_mark_get(attrs, &m);
737
738 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
739 err = -ESRCH;
740 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
741 } else {
742 xfrm_address_t *saddr = NULL;
743
744 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
745 if (!saddr) {
746 err = -EINVAL;
747 goto out;
748 }
749
750 err = -ESRCH;
751 x = xfrm_state_lookup_byaddr(net, mark,
752 &p->daddr, saddr,
753 p->proto, p->family);
754 }
755
756 out:
757 if (!x && errp)
758 *errp = err;
759 return x;
760 }
761
xfrm_del_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)762 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
763 struct nlattr **attrs)
764 {
765 struct net *net = sock_net(skb->sk);
766 struct xfrm_state *x;
767 int err = -ESRCH;
768 struct km_event c;
769 struct xfrm_usersa_id *p = nlmsg_data(nlh);
770
771 x = xfrm_user_state_lookup(net, p, attrs, &err);
772 if (x == NULL)
773 return err;
774
775 if ((err = security_xfrm_state_delete(x)) != 0)
776 goto out;
777
778 if (xfrm_state_kern(x)) {
779 err = -EPERM;
780 goto out;
781 }
782
783 err = xfrm_state_delete(x);
784
785 if (err < 0)
786 goto out;
787
788 c.seq = nlh->nlmsg_seq;
789 c.portid = nlh->nlmsg_pid;
790 c.event = nlh->nlmsg_type;
791 km_state_notify(x, &c);
792
793 out:
794 xfrm_audit_state_delete(x, err ? 0 : 1, true);
795 xfrm_state_put(x);
796 return err;
797 }
798
copy_to_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)799 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
800 {
801 memset(p, 0, sizeof(*p));
802 memcpy(&p->id, &x->id, sizeof(p->id));
803 memcpy(&p->sel, &x->sel, sizeof(p->sel));
804 memcpy(&p->lft, &x->lft, sizeof(p->lft));
805 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
806 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
807 put_unaligned(x->stats.replay, &p->stats.replay);
808 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
809 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
810 p->mode = x->props.mode;
811 p->replay_window = x->props.replay_window;
812 p->reqid = x->props.reqid;
813 p->family = x->props.family;
814 p->flags = x->props.flags;
815 p->seq = x->km.seq;
816 }
817
818 struct xfrm_dump_info {
819 struct sk_buff *in_skb;
820 struct sk_buff *out_skb;
821 u32 nlmsg_seq;
822 u16 nlmsg_flags;
823 };
824
copy_sec_ctx(struct xfrm_sec_ctx * s,struct sk_buff * skb)825 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
826 {
827 struct xfrm_user_sec_ctx *uctx;
828 struct nlattr *attr;
829 int ctx_size = sizeof(*uctx) + s->ctx_len;
830
831 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
832 if (attr == NULL)
833 return -EMSGSIZE;
834
835 uctx = nla_data(attr);
836 uctx->exttype = XFRMA_SEC_CTX;
837 uctx->len = ctx_size;
838 uctx->ctx_doi = s->ctx_doi;
839 uctx->ctx_alg = s->ctx_alg;
840 uctx->ctx_len = s->ctx_len;
841 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
842
843 return 0;
844 }
845
copy_user_offload(struct xfrm_state_offload * xso,struct sk_buff * skb)846 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
847 {
848 struct xfrm_user_offload *xuo;
849 struct nlattr *attr;
850
851 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
852 if (attr == NULL)
853 return -EMSGSIZE;
854
855 xuo = nla_data(attr);
856 memset(xuo, 0, sizeof(*xuo));
857 xuo->ifindex = xso->dev->ifindex;
858 xuo->flags = xso->flags;
859
860 return 0;
861 }
862
copy_to_user_auth(struct xfrm_algo_auth * auth,struct sk_buff * skb)863 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
864 {
865 struct xfrm_algo *algo;
866 struct nlattr *nla;
867
868 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
869 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
870 if (!nla)
871 return -EMSGSIZE;
872
873 algo = nla_data(nla);
874 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
875 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
876 algo->alg_key_len = auth->alg_key_len;
877
878 return 0;
879 }
880
xfrm_smark_put(struct sk_buff * skb,struct xfrm_mark * m)881 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
882 {
883 int ret = 0;
884
885 if (m->v | m->m) {
886 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
887 if (!ret)
888 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
889 }
890 return ret;
891 }
892
893 /* 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)894 static int copy_to_user_state_extra(struct xfrm_state *x,
895 struct xfrm_usersa_info *p,
896 struct sk_buff *skb)
897 {
898 int ret = 0;
899
900 copy_to_user_state(x, p);
901
902 if (x->props.extra_flags) {
903 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
904 x->props.extra_flags);
905 if (ret)
906 goto out;
907 }
908
909 if (x->coaddr) {
910 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
911 if (ret)
912 goto out;
913 }
914 if (x->lastused) {
915 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
916 XFRMA_PAD);
917 if (ret)
918 goto out;
919 }
920 if (x->aead) {
921 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
922 if (ret)
923 goto out;
924 }
925 if (x->aalg) {
926 ret = copy_to_user_auth(x->aalg, skb);
927 if (!ret)
928 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
929 xfrm_alg_auth_len(x->aalg), x->aalg);
930 if (ret)
931 goto out;
932 }
933 if (x->ealg) {
934 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
935 if (ret)
936 goto out;
937 }
938 if (x->calg) {
939 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
940 if (ret)
941 goto out;
942 }
943 if (x->encap) {
944 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
945 if (ret)
946 goto out;
947 }
948 if (x->tfcpad) {
949 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
950 if (ret)
951 goto out;
952 }
953 ret = xfrm_mark_put(skb, &x->mark);
954 if (ret)
955 goto out;
956
957 ret = xfrm_smark_put(skb, &x->props.smark);
958 if (ret)
959 goto out;
960
961 if (x->replay_esn)
962 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
963 xfrm_replay_state_esn_len(x->replay_esn),
964 x->replay_esn);
965 else
966 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
967 &x->replay);
968 if (ret)
969 goto out;
970 if(x->xso.dev)
971 ret = copy_user_offload(&x->xso, skb);
972 if (ret)
973 goto out;
974 if (x->if_id) {
975 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
976 if (ret)
977 goto out;
978 }
979 if (x->security) {
980 ret = copy_sec_ctx(x->security, skb);
981 if (ret)
982 goto out;
983 }
984 if (x->mapping_maxage)
985 ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage);
986 out:
987 return ret;
988 }
989
dump_one_state(struct xfrm_state * x,int count,void * ptr)990 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
991 {
992 struct xfrm_dump_info *sp = ptr;
993 struct sk_buff *in_skb = sp->in_skb;
994 struct sk_buff *skb = sp->out_skb;
995 struct xfrm_translator *xtr;
996 struct xfrm_usersa_info *p;
997 struct nlmsghdr *nlh;
998 int err;
999
1000 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1001 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1002 if (nlh == NULL)
1003 return -EMSGSIZE;
1004
1005 p = nlmsg_data(nlh);
1006
1007 err = copy_to_user_state_extra(x, p, skb);
1008 if (err) {
1009 nlmsg_cancel(skb, nlh);
1010 return err;
1011 }
1012 nlmsg_end(skb, nlh);
1013
1014 xtr = xfrm_get_translator();
1015 if (xtr) {
1016 err = xtr->alloc_compat(skb, nlh);
1017
1018 xfrm_put_translator(xtr);
1019 if (err) {
1020 nlmsg_cancel(skb, nlh);
1021 return err;
1022 }
1023 }
1024
1025 return 0;
1026 }
1027
xfrm_dump_sa_done(struct netlink_callback * cb)1028 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1029 {
1030 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1031 struct sock *sk = cb->skb->sk;
1032 struct net *net = sock_net(sk);
1033
1034 if (cb->args[0])
1035 xfrm_state_walk_done(walk, net);
1036 return 0;
1037 }
1038
xfrm_dump_sa(struct sk_buff * skb,struct netlink_callback * cb)1039 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1040 {
1041 struct net *net = sock_net(skb->sk);
1042 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1043 struct xfrm_dump_info info;
1044
1045 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1046 sizeof(cb->args) - sizeof(cb->args[0]));
1047
1048 info.in_skb = cb->skb;
1049 info.out_skb = skb;
1050 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1051 info.nlmsg_flags = NLM_F_MULTI;
1052
1053 if (!cb->args[0]) {
1054 struct nlattr *attrs[XFRMA_MAX+1];
1055 struct xfrm_address_filter *filter = NULL;
1056 u8 proto = 0;
1057 int err;
1058
1059 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1060 xfrma_policy, cb->extack);
1061 if (err < 0)
1062 return err;
1063
1064 if (attrs[XFRMA_ADDRESS_FILTER]) {
1065 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1066 sizeof(*filter), GFP_KERNEL);
1067 if (filter == NULL)
1068 return -ENOMEM;
1069
1070 /* see addr_match(), (prefix length >> 5) << 2
1071 * will be used to compare xfrm_address_t
1072 */
1073 if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1074 filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1075 kfree(filter);
1076 return -EINVAL;
1077 }
1078 }
1079
1080 if (attrs[XFRMA_PROTO])
1081 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1082
1083 xfrm_state_walk_init(walk, proto, filter);
1084 cb->args[0] = 1;
1085 }
1086
1087 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1088
1089 return skb->len;
1090 }
1091
xfrm_state_netlink(struct sk_buff * in_skb,struct xfrm_state * x,u32 seq)1092 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1093 struct xfrm_state *x, u32 seq)
1094 {
1095 struct xfrm_dump_info info;
1096 struct sk_buff *skb;
1097 int err;
1098
1099 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1100 if (!skb)
1101 return ERR_PTR(-ENOMEM);
1102
1103 info.in_skb = in_skb;
1104 info.out_skb = skb;
1105 info.nlmsg_seq = seq;
1106 info.nlmsg_flags = 0;
1107
1108 err = dump_one_state(x, 0, &info);
1109 if (err) {
1110 kfree_skb(skb);
1111 return ERR_PTR(err);
1112 }
1113
1114 return skb;
1115 }
1116
1117 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1118 * Must be called with RCU read lock.
1119 */
xfrm_nlmsg_multicast(struct net * net,struct sk_buff * skb,u32 pid,unsigned int group)1120 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1121 u32 pid, unsigned int group)
1122 {
1123 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1124 struct xfrm_translator *xtr;
1125
1126 if (!nlsk) {
1127 kfree_skb(skb);
1128 return -EPIPE;
1129 }
1130
1131 xtr = xfrm_get_translator();
1132 if (xtr) {
1133 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1134
1135 xfrm_put_translator(xtr);
1136 if (err) {
1137 kfree_skb(skb);
1138 return err;
1139 }
1140 }
1141
1142 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1143 }
1144
xfrm_spdinfo_msgsize(void)1145 static inline unsigned int xfrm_spdinfo_msgsize(void)
1146 {
1147 return NLMSG_ALIGN(4)
1148 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1149 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1150 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1151 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1152 }
1153
build_spdinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1154 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1155 u32 portid, u32 seq, u32 flags)
1156 {
1157 struct xfrmk_spdinfo si;
1158 struct xfrmu_spdinfo spc;
1159 struct xfrmu_spdhinfo sph;
1160 struct xfrmu_spdhthresh spt4, spt6;
1161 struct nlmsghdr *nlh;
1162 int err;
1163 u32 *f;
1164 unsigned lseq;
1165
1166 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1167 if (nlh == NULL) /* shouldn't really happen ... */
1168 return -EMSGSIZE;
1169
1170 f = nlmsg_data(nlh);
1171 *f = flags;
1172 xfrm_spd_getinfo(net, &si);
1173 spc.incnt = si.incnt;
1174 spc.outcnt = si.outcnt;
1175 spc.fwdcnt = si.fwdcnt;
1176 spc.inscnt = si.inscnt;
1177 spc.outscnt = si.outscnt;
1178 spc.fwdscnt = si.fwdscnt;
1179 sph.spdhcnt = si.spdhcnt;
1180 sph.spdhmcnt = si.spdhmcnt;
1181
1182 do {
1183 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1184
1185 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1186 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1187 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1188 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1189 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1190
1191 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1192 if (!err)
1193 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1194 if (!err)
1195 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1196 if (!err)
1197 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1198 if (err) {
1199 nlmsg_cancel(skb, nlh);
1200 return err;
1201 }
1202
1203 nlmsg_end(skb, nlh);
1204 return 0;
1205 }
1206
xfrm_set_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1207 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1208 struct nlattr **attrs)
1209 {
1210 struct net *net = sock_net(skb->sk);
1211 struct xfrmu_spdhthresh *thresh4 = NULL;
1212 struct xfrmu_spdhthresh *thresh6 = NULL;
1213
1214 /* selector prefixlen thresholds to hash policies */
1215 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1216 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1217
1218 if (nla_len(rta) < sizeof(*thresh4))
1219 return -EINVAL;
1220 thresh4 = nla_data(rta);
1221 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1222 return -EINVAL;
1223 }
1224 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1225 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1226
1227 if (nla_len(rta) < sizeof(*thresh6))
1228 return -EINVAL;
1229 thresh6 = nla_data(rta);
1230 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1231 return -EINVAL;
1232 }
1233
1234 if (thresh4 || thresh6) {
1235 write_seqlock(&net->xfrm.policy_hthresh.lock);
1236 if (thresh4) {
1237 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1238 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1239 }
1240 if (thresh6) {
1241 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1242 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1243 }
1244 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1245
1246 xfrm_policy_hash_rebuild(net);
1247 }
1248
1249 return 0;
1250 }
1251
xfrm_get_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1252 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1253 struct nlattr **attrs)
1254 {
1255 struct net *net = sock_net(skb->sk);
1256 struct sk_buff *r_skb;
1257 u32 *flags = nlmsg_data(nlh);
1258 u32 sportid = NETLINK_CB(skb).portid;
1259 u32 seq = nlh->nlmsg_seq;
1260 int err;
1261
1262 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1263 if (r_skb == NULL)
1264 return -ENOMEM;
1265
1266 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1267 BUG_ON(err < 0);
1268
1269 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1270 }
1271
xfrm_sadinfo_msgsize(void)1272 static inline unsigned int xfrm_sadinfo_msgsize(void)
1273 {
1274 return NLMSG_ALIGN(4)
1275 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1276 + nla_total_size(4); /* XFRMA_SAD_CNT */
1277 }
1278
build_sadinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1279 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1280 u32 portid, u32 seq, u32 flags)
1281 {
1282 struct xfrmk_sadinfo si;
1283 struct xfrmu_sadhinfo sh;
1284 struct nlmsghdr *nlh;
1285 int err;
1286 u32 *f;
1287
1288 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1289 if (nlh == NULL) /* shouldn't really happen ... */
1290 return -EMSGSIZE;
1291
1292 f = nlmsg_data(nlh);
1293 *f = flags;
1294 xfrm_sad_getinfo(net, &si);
1295
1296 sh.sadhmcnt = si.sadhmcnt;
1297 sh.sadhcnt = si.sadhcnt;
1298
1299 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1300 if (!err)
1301 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1302 if (err) {
1303 nlmsg_cancel(skb, nlh);
1304 return err;
1305 }
1306
1307 nlmsg_end(skb, nlh);
1308 return 0;
1309 }
1310
xfrm_get_sadinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1311 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1312 struct nlattr **attrs)
1313 {
1314 struct net *net = sock_net(skb->sk);
1315 struct sk_buff *r_skb;
1316 u32 *flags = nlmsg_data(nlh);
1317 u32 sportid = NETLINK_CB(skb).portid;
1318 u32 seq = nlh->nlmsg_seq;
1319 int err;
1320
1321 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1322 if (r_skb == NULL)
1323 return -ENOMEM;
1324
1325 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1326 BUG_ON(err < 0);
1327
1328 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1329 }
1330
xfrm_get_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1331 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1332 struct nlattr **attrs)
1333 {
1334 struct net *net = sock_net(skb->sk);
1335 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1336 struct xfrm_state *x;
1337 struct sk_buff *resp_skb;
1338 int err = -ESRCH;
1339
1340 x = xfrm_user_state_lookup(net, p, attrs, &err);
1341 if (x == NULL)
1342 goto out_noput;
1343
1344 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1345 if (IS_ERR(resp_skb)) {
1346 err = PTR_ERR(resp_skb);
1347 } else {
1348 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1349 }
1350 xfrm_state_put(x);
1351 out_noput:
1352 return err;
1353 }
1354
xfrm_alloc_userspi(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1355 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1356 struct nlattr **attrs)
1357 {
1358 struct net *net = sock_net(skb->sk);
1359 struct xfrm_state *x;
1360 struct xfrm_userspi_info *p;
1361 struct xfrm_translator *xtr;
1362 struct sk_buff *resp_skb;
1363 xfrm_address_t *daddr;
1364 int family;
1365 int err;
1366 u32 mark;
1367 struct xfrm_mark m;
1368 u32 if_id = 0;
1369
1370 p = nlmsg_data(nlh);
1371 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1372 if (err)
1373 goto out_noput;
1374
1375 family = p->info.family;
1376 daddr = &p->info.id.daddr;
1377
1378 x = NULL;
1379
1380 mark = xfrm_mark_get(attrs, &m);
1381
1382 if (attrs[XFRMA_IF_ID])
1383 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1384
1385 if (p->info.seq) {
1386 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1387 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1388 xfrm_state_put(x);
1389 x = NULL;
1390 }
1391 }
1392
1393 if (!x)
1394 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1395 if_id, p->info.id.proto, daddr,
1396 &p->info.saddr, 1,
1397 family);
1398 err = -ENOENT;
1399 if (x == NULL)
1400 goto out_noput;
1401
1402 err = xfrm_alloc_spi(x, p->min, p->max);
1403 if (err)
1404 goto out;
1405
1406 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1407 if (IS_ERR(resp_skb)) {
1408 err = PTR_ERR(resp_skb);
1409 goto out;
1410 }
1411
1412 xtr = xfrm_get_translator();
1413 if (xtr) {
1414 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1415
1416 xfrm_put_translator(xtr);
1417 if (err) {
1418 kfree_skb(resp_skb);
1419 goto out;
1420 }
1421 }
1422
1423 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1424
1425 out:
1426 xfrm_state_put(x);
1427 out_noput:
1428 return err;
1429 }
1430
verify_policy_dir(u8 dir)1431 static int verify_policy_dir(u8 dir)
1432 {
1433 switch (dir) {
1434 case XFRM_POLICY_IN:
1435 case XFRM_POLICY_OUT:
1436 case XFRM_POLICY_FWD:
1437 break;
1438
1439 default:
1440 return -EINVAL;
1441 }
1442
1443 return 0;
1444 }
1445
verify_policy_type(u8 type)1446 static int verify_policy_type(u8 type)
1447 {
1448 switch (type) {
1449 case XFRM_POLICY_TYPE_MAIN:
1450 #ifdef CONFIG_XFRM_SUB_POLICY
1451 case XFRM_POLICY_TYPE_SUB:
1452 #endif
1453 break;
1454
1455 default:
1456 return -EINVAL;
1457 }
1458
1459 return 0;
1460 }
1461
verify_newpolicy_info(struct xfrm_userpolicy_info * p)1462 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1463 {
1464 int ret;
1465
1466 switch (p->share) {
1467 case XFRM_SHARE_ANY:
1468 case XFRM_SHARE_SESSION:
1469 case XFRM_SHARE_USER:
1470 case XFRM_SHARE_UNIQUE:
1471 break;
1472
1473 default:
1474 return -EINVAL;
1475 }
1476
1477 switch (p->action) {
1478 case XFRM_POLICY_ALLOW:
1479 case XFRM_POLICY_BLOCK:
1480 break;
1481
1482 default:
1483 return -EINVAL;
1484 }
1485
1486 switch (p->sel.family) {
1487 case AF_INET:
1488 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1489 return -EINVAL;
1490
1491 break;
1492
1493 case AF_INET6:
1494 #if IS_ENABLED(CONFIG_IPV6)
1495 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1496 return -EINVAL;
1497
1498 break;
1499 #else
1500 return -EAFNOSUPPORT;
1501 #endif
1502
1503 default:
1504 return -EINVAL;
1505 }
1506
1507 ret = verify_policy_dir(p->dir);
1508 if (ret)
1509 return ret;
1510 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1511 return -EINVAL;
1512
1513 return 0;
1514 }
1515
copy_from_user_sec_ctx(struct xfrm_policy * pol,struct nlattr ** attrs)1516 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1517 {
1518 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1519 struct xfrm_user_sec_ctx *uctx;
1520
1521 if (!rt)
1522 return 0;
1523
1524 uctx = nla_data(rt);
1525 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1526 }
1527
copy_templates(struct xfrm_policy * xp,struct xfrm_user_tmpl * ut,int nr)1528 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1529 int nr)
1530 {
1531 int i;
1532
1533 xp->xfrm_nr = nr;
1534 for (i = 0; i < nr; i++, ut++) {
1535 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1536
1537 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1538 memcpy(&t->saddr, &ut->saddr,
1539 sizeof(xfrm_address_t));
1540 t->reqid = ut->reqid;
1541 t->mode = ut->mode;
1542 t->share = ut->share;
1543 t->optional = ut->optional;
1544 t->aalgos = ut->aalgos;
1545 t->ealgos = ut->ealgos;
1546 t->calgos = ut->calgos;
1547 /* If all masks are ~0, then we allow all algorithms. */
1548 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1549 t->encap_family = ut->family;
1550 }
1551 }
1552
validate_tmpl(int nr,struct xfrm_user_tmpl * ut,u16 family)1553 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1554 {
1555 u16 prev_family;
1556 int i;
1557
1558 if (nr > XFRM_MAX_DEPTH)
1559 return -EINVAL;
1560
1561 prev_family = family;
1562
1563 for (i = 0; i < nr; i++) {
1564 /* We never validated the ut->family value, so many
1565 * applications simply leave it at zero. The check was
1566 * never made and ut->family was ignored because all
1567 * templates could be assumed to have the same family as
1568 * the policy itself. Now that we will have ipv4-in-ipv6
1569 * and ipv6-in-ipv4 tunnels, this is no longer true.
1570 */
1571 if (!ut[i].family)
1572 ut[i].family = family;
1573
1574 switch (ut[i].mode) {
1575 case XFRM_MODE_TUNNEL:
1576 case XFRM_MODE_BEET:
1577 break;
1578 default:
1579 if (ut[i].family != prev_family)
1580 return -EINVAL;
1581 break;
1582 }
1583 if (ut[i].mode >= XFRM_MODE_MAX)
1584 return -EINVAL;
1585
1586 prev_family = ut[i].family;
1587
1588 switch (ut[i].family) {
1589 case AF_INET:
1590 break;
1591 #if IS_ENABLED(CONFIG_IPV6)
1592 case AF_INET6:
1593 break;
1594 #endif
1595 default:
1596 return -EINVAL;
1597 }
1598
1599 if (!xfrm_id_proto_valid(ut[i].id.proto))
1600 return -EINVAL;
1601 }
1602
1603 return 0;
1604 }
1605
copy_from_user_tmpl(struct xfrm_policy * pol,struct nlattr ** attrs)1606 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1607 {
1608 struct nlattr *rt = attrs[XFRMA_TMPL];
1609
1610 if (!rt) {
1611 pol->xfrm_nr = 0;
1612 } else {
1613 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1614 int nr = nla_len(rt) / sizeof(*utmpl);
1615 int err;
1616
1617 err = validate_tmpl(nr, utmpl, pol->family);
1618 if (err)
1619 return err;
1620
1621 copy_templates(pol, utmpl, nr);
1622 }
1623 return 0;
1624 }
1625
copy_from_user_policy_type(u8 * tp,struct nlattr ** attrs)1626 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1627 {
1628 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1629 struct xfrm_userpolicy_type *upt;
1630 u8 type = XFRM_POLICY_TYPE_MAIN;
1631 int err;
1632
1633 if (rt) {
1634 upt = nla_data(rt);
1635 type = upt->type;
1636 }
1637
1638 err = verify_policy_type(type);
1639 if (err)
1640 return err;
1641
1642 *tp = type;
1643 return 0;
1644 }
1645
copy_from_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p)1646 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1647 {
1648 xp->priority = p->priority;
1649 xp->index = p->index;
1650 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1651 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1652 xp->action = p->action;
1653 xp->flags = p->flags;
1654 xp->family = p->sel.family;
1655 /* XXX xp->share = p->share; */
1656 }
1657
copy_to_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p,int dir)1658 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1659 {
1660 memset(p, 0, sizeof(*p));
1661 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1662 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1663 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1664 p->priority = xp->priority;
1665 p->index = xp->index;
1666 p->sel.family = xp->family;
1667 p->dir = dir;
1668 p->action = xp->action;
1669 p->flags = xp->flags;
1670 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1671 }
1672
xfrm_policy_construct(struct net * net,struct xfrm_userpolicy_info * p,struct nlattr ** attrs,int * errp)1673 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1674 {
1675 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1676 int err;
1677
1678 if (!xp) {
1679 *errp = -ENOMEM;
1680 return NULL;
1681 }
1682
1683 copy_from_user_policy(xp, p);
1684
1685 err = copy_from_user_policy_type(&xp->type, attrs);
1686 if (err)
1687 goto error;
1688
1689 if (!(err = copy_from_user_tmpl(xp, attrs)))
1690 err = copy_from_user_sec_ctx(xp, attrs);
1691 if (err)
1692 goto error;
1693
1694 xfrm_mark_get(attrs, &xp->mark);
1695
1696 if (attrs[XFRMA_IF_ID])
1697 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1698
1699 return xp;
1700 error:
1701 *errp = err;
1702 xp->walk.dead = 1;
1703 xfrm_policy_destroy(xp);
1704 return NULL;
1705 }
1706
xfrm_add_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1707 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1708 struct nlattr **attrs)
1709 {
1710 struct net *net = sock_net(skb->sk);
1711 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1712 struct xfrm_policy *xp;
1713 struct km_event c;
1714 int err;
1715 int excl;
1716
1717 err = verify_newpolicy_info(p);
1718 if (err)
1719 return err;
1720 err = verify_sec_ctx_len(attrs);
1721 if (err)
1722 return err;
1723
1724 xp = xfrm_policy_construct(net, p, attrs, &err);
1725 if (!xp)
1726 return err;
1727
1728 /* shouldn't excl be based on nlh flags??
1729 * Aha! this is anti-netlink really i.e more pfkey derived
1730 * in netlink excl is a flag and you wouldnt need
1731 * a type XFRM_MSG_UPDPOLICY - JHS */
1732 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1733 err = xfrm_policy_insert(p->dir, xp, excl);
1734 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1735
1736 if (err) {
1737 security_xfrm_policy_free(xp->security);
1738 kfree(xp);
1739 return err;
1740 }
1741
1742 c.event = nlh->nlmsg_type;
1743 c.seq = nlh->nlmsg_seq;
1744 c.portid = nlh->nlmsg_pid;
1745 km_policy_notify(xp, p->dir, &c);
1746
1747 xfrm_pol_put(xp);
1748
1749 return 0;
1750 }
1751
copy_to_user_tmpl(struct xfrm_policy * xp,struct sk_buff * skb)1752 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1753 {
1754 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1755 int i;
1756
1757 if (xp->xfrm_nr == 0)
1758 return 0;
1759
1760 for (i = 0; i < xp->xfrm_nr; i++) {
1761 struct xfrm_user_tmpl *up = &vec[i];
1762 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1763
1764 memset(up, 0, sizeof(*up));
1765 memcpy(&up->id, &kp->id, sizeof(up->id));
1766 up->family = kp->encap_family;
1767 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1768 up->reqid = kp->reqid;
1769 up->mode = kp->mode;
1770 up->share = kp->share;
1771 up->optional = kp->optional;
1772 up->aalgos = kp->aalgos;
1773 up->ealgos = kp->ealgos;
1774 up->calgos = kp->calgos;
1775 }
1776
1777 return nla_put(skb, XFRMA_TMPL,
1778 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1779 }
1780
copy_to_user_state_sec_ctx(struct xfrm_state * x,struct sk_buff * skb)1781 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1782 {
1783 if (x->security) {
1784 return copy_sec_ctx(x->security, skb);
1785 }
1786 return 0;
1787 }
1788
copy_to_user_sec_ctx(struct xfrm_policy * xp,struct sk_buff * skb)1789 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1790 {
1791 if (xp->security)
1792 return copy_sec_ctx(xp->security, skb);
1793 return 0;
1794 }
userpolicy_type_attrsize(void)1795 static inline unsigned int userpolicy_type_attrsize(void)
1796 {
1797 #ifdef CONFIG_XFRM_SUB_POLICY
1798 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1799 #else
1800 return 0;
1801 #endif
1802 }
1803
1804 #ifdef CONFIG_XFRM_SUB_POLICY
copy_to_user_policy_type(u8 type,struct sk_buff * skb)1805 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1806 {
1807 struct xfrm_userpolicy_type upt;
1808
1809 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1810 memset(&upt, 0, sizeof(upt));
1811 upt.type = type;
1812
1813 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1814 }
1815
1816 #else
copy_to_user_policy_type(u8 type,struct sk_buff * skb)1817 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1818 {
1819 return 0;
1820 }
1821 #endif
1822
dump_one_policy(struct xfrm_policy * xp,int dir,int count,void * ptr)1823 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1824 {
1825 struct xfrm_dump_info *sp = ptr;
1826 struct xfrm_userpolicy_info *p;
1827 struct sk_buff *in_skb = sp->in_skb;
1828 struct sk_buff *skb = sp->out_skb;
1829 struct xfrm_translator *xtr;
1830 struct nlmsghdr *nlh;
1831 int err;
1832
1833 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1834 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1835 if (nlh == NULL)
1836 return -EMSGSIZE;
1837
1838 p = nlmsg_data(nlh);
1839 copy_to_user_policy(xp, p, dir);
1840 err = copy_to_user_tmpl(xp, skb);
1841 if (!err)
1842 err = copy_to_user_sec_ctx(xp, skb);
1843 if (!err)
1844 err = copy_to_user_policy_type(xp->type, skb);
1845 if (!err)
1846 err = xfrm_mark_put(skb, &xp->mark);
1847 if (!err)
1848 err = xfrm_if_id_put(skb, xp->if_id);
1849 if (err) {
1850 nlmsg_cancel(skb, nlh);
1851 return err;
1852 }
1853 nlmsg_end(skb, nlh);
1854
1855 xtr = xfrm_get_translator();
1856 if (xtr) {
1857 err = xtr->alloc_compat(skb, nlh);
1858
1859 xfrm_put_translator(xtr);
1860 if (err) {
1861 nlmsg_cancel(skb, nlh);
1862 return err;
1863 }
1864 }
1865
1866 return 0;
1867 }
1868
xfrm_dump_policy_done(struct netlink_callback * cb)1869 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1870 {
1871 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1872 struct net *net = sock_net(cb->skb->sk);
1873
1874 xfrm_policy_walk_done(walk, net);
1875 return 0;
1876 }
1877
xfrm_dump_policy_start(struct netlink_callback * cb)1878 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1879 {
1880 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1881
1882 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1883
1884 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1885 return 0;
1886 }
1887
xfrm_dump_policy(struct sk_buff * skb,struct netlink_callback * cb)1888 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1889 {
1890 struct net *net = sock_net(skb->sk);
1891 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1892 struct xfrm_dump_info info;
1893
1894 info.in_skb = cb->skb;
1895 info.out_skb = skb;
1896 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1897 info.nlmsg_flags = NLM_F_MULTI;
1898
1899 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1900
1901 return skb->len;
1902 }
1903
xfrm_policy_netlink(struct sk_buff * in_skb,struct xfrm_policy * xp,int dir,u32 seq)1904 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1905 struct xfrm_policy *xp,
1906 int dir, u32 seq)
1907 {
1908 struct xfrm_dump_info info;
1909 struct sk_buff *skb;
1910 int err;
1911
1912 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1913 if (!skb)
1914 return ERR_PTR(-ENOMEM);
1915
1916 info.in_skb = in_skb;
1917 info.out_skb = skb;
1918 info.nlmsg_seq = seq;
1919 info.nlmsg_flags = 0;
1920
1921 err = dump_one_policy(xp, dir, 0, &info);
1922 if (err) {
1923 kfree_skb(skb);
1924 return ERR_PTR(err);
1925 }
1926
1927 return skb;
1928 }
1929
xfrm_notify_userpolicy(struct net * net)1930 static int xfrm_notify_userpolicy(struct net *net)
1931 {
1932 struct xfrm_userpolicy_default *up;
1933 int len = NLMSG_ALIGN(sizeof(*up));
1934 struct nlmsghdr *nlh;
1935 struct sk_buff *skb;
1936 int err;
1937
1938 skb = nlmsg_new(len, GFP_ATOMIC);
1939 if (skb == NULL)
1940 return -ENOMEM;
1941
1942 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
1943 if (nlh == NULL) {
1944 kfree_skb(skb);
1945 return -EMSGSIZE;
1946 }
1947
1948 up = nlmsg_data(nlh);
1949 up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
1950 up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
1951 up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
1952
1953 nlmsg_end(skb, nlh);
1954
1955 rcu_read_lock();
1956 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
1957 rcu_read_unlock();
1958
1959 return err;
1960 }
1961
xfrm_userpolicy_is_valid(__u8 policy)1962 static bool xfrm_userpolicy_is_valid(__u8 policy)
1963 {
1964 return policy == XFRM_USERPOLICY_BLOCK ||
1965 policy == XFRM_USERPOLICY_ACCEPT;
1966 }
1967
xfrm_set_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1968 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
1969 struct nlattr **attrs)
1970 {
1971 struct net *net = sock_net(skb->sk);
1972 struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
1973
1974 if (xfrm_userpolicy_is_valid(up->in))
1975 net->xfrm.policy_default[XFRM_POLICY_IN] = up->in;
1976
1977 if (xfrm_userpolicy_is_valid(up->fwd))
1978 net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd;
1979
1980 if (xfrm_userpolicy_is_valid(up->out))
1981 net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out;
1982
1983 rt_genid_bump_all(net);
1984
1985 xfrm_notify_userpolicy(net);
1986 return 0;
1987 }
1988
xfrm_get_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1989 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
1990 struct nlattr **attrs)
1991 {
1992 struct sk_buff *r_skb;
1993 struct nlmsghdr *r_nlh;
1994 struct net *net = sock_net(skb->sk);
1995 struct xfrm_userpolicy_default *r_up;
1996 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
1997 u32 portid = NETLINK_CB(skb).portid;
1998 u32 seq = nlh->nlmsg_seq;
1999
2000 r_skb = nlmsg_new(len, GFP_ATOMIC);
2001 if (!r_skb)
2002 return -ENOMEM;
2003
2004 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2005 if (!r_nlh) {
2006 kfree_skb(r_skb);
2007 return -EMSGSIZE;
2008 }
2009
2010 r_up = nlmsg_data(r_nlh);
2011 r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN];
2012 r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD];
2013 r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT];
2014 nlmsg_end(r_skb, r_nlh);
2015
2016 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2017 }
2018
xfrm_get_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2019 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2020 struct nlattr **attrs)
2021 {
2022 struct net *net = sock_net(skb->sk);
2023 struct xfrm_policy *xp;
2024 struct xfrm_userpolicy_id *p;
2025 u8 type = XFRM_POLICY_TYPE_MAIN;
2026 int err;
2027 struct km_event c;
2028 int delete;
2029 struct xfrm_mark m;
2030 u32 if_id = 0;
2031
2032 p = nlmsg_data(nlh);
2033 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2034
2035 err = copy_from_user_policy_type(&type, attrs);
2036 if (err)
2037 return err;
2038
2039 err = verify_policy_dir(p->dir);
2040 if (err)
2041 return err;
2042
2043 if (attrs[XFRMA_IF_ID])
2044 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2045
2046 xfrm_mark_get(attrs, &m);
2047
2048 if (p->index)
2049 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2050 p->index, delete, &err);
2051 else {
2052 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2053 struct xfrm_sec_ctx *ctx;
2054
2055 err = verify_sec_ctx_len(attrs);
2056 if (err)
2057 return err;
2058
2059 ctx = NULL;
2060 if (rt) {
2061 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2062
2063 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2064 if (err)
2065 return err;
2066 }
2067 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2068 &p->sel, ctx, delete, &err);
2069 security_xfrm_policy_free(ctx);
2070 }
2071 if (xp == NULL)
2072 return -ENOENT;
2073
2074 if (!delete) {
2075 struct sk_buff *resp_skb;
2076
2077 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2078 if (IS_ERR(resp_skb)) {
2079 err = PTR_ERR(resp_skb);
2080 } else {
2081 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2082 NETLINK_CB(skb).portid);
2083 }
2084 } else {
2085 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2086
2087 if (err != 0)
2088 goto out;
2089
2090 c.data.byid = p->index;
2091 c.event = nlh->nlmsg_type;
2092 c.seq = nlh->nlmsg_seq;
2093 c.portid = nlh->nlmsg_pid;
2094 km_policy_notify(xp, p->dir, &c);
2095 }
2096
2097 out:
2098 xfrm_pol_put(xp);
2099 return err;
2100 }
2101
xfrm_flush_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2102 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2103 struct nlattr **attrs)
2104 {
2105 struct net *net = sock_net(skb->sk);
2106 struct km_event c;
2107 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2108 int err;
2109
2110 err = xfrm_state_flush(net, p->proto, true, false);
2111 if (err) {
2112 if (err == -ESRCH) /* empty table */
2113 return 0;
2114 return err;
2115 }
2116 c.data.proto = p->proto;
2117 c.event = nlh->nlmsg_type;
2118 c.seq = nlh->nlmsg_seq;
2119 c.portid = nlh->nlmsg_pid;
2120 c.net = net;
2121 km_state_notify(NULL, &c);
2122
2123 return 0;
2124 }
2125
xfrm_aevent_msgsize(struct xfrm_state * x)2126 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2127 {
2128 unsigned int replay_size = x->replay_esn ?
2129 xfrm_replay_state_esn_len(x->replay_esn) :
2130 sizeof(struct xfrm_replay_state);
2131
2132 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2133 + nla_total_size(replay_size)
2134 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2135 + nla_total_size(sizeof(struct xfrm_mark))
2136 + nla_total_size(4) /* XFRM_AE_RTHR */
2137 + nla_total_size(4); /* XFRM_AE_ETHR */
2138 }
2139
build_aevent(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2140 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2141 {
2142 struct xfrm_aevent_id *id;
2143 struct nlmsghdr *nlh;
2144 int err;
2145
2146 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2147 if (nlh == NULL)
2148 return -EMSGSIZE;
2149
2150 id = nlmsg_data(nlh);
2151 memset(&id->sa_id, 0, sizeof(id->sa_id));
2152 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2153 id->sa_id.spi = x->id.spi;
2154 id->sa_id.family = x->props.family;
2155 id->sa_id.proto = x->id.proto;
2156 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2157 id->reqid = x->props.reqid;
2158 id->flags = c->data.aevent;
2159
2160 if (x->replay_esn) {
2161 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2162 xfrm_replay_state_esn_len(x->replay_esn),
2163 x->replay_esn);
2164 } else {
2165 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2166 &x->replay);
2167 }
2168 if (err)
2169 goto out_cancel;
2170 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2171 XFRMA_PAD);
2172 if (err)
2173 goto out_cancel;
2174
2175 if (id->flags & XFRM_AE_RTHR) {
2176 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2177 if (err)
2178 goto out_cancel;
2179 }
2180 if (id->flags & XFRM_AE_ETHR) {
2181 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2182 x->replay_maxage * 10 / HZ);
2183 if (err)
2184 goto out_cancel;
2185 }
2186 err = xfrm_mark_put(skb, &x->mark);
2187 if (err)
2188 goto out_cancel;
2189
2190 err = xfrm_if_id_put(skb, x->if_id);
2191 if (err)
2192 goto out_cancel;
2193
2194 nlmsg_end(skb, nlh);
2195 return 0;
2196
2197 out_cancel:
2198 nlmsg_cancel(skb, nlh);
2199 return err;
2200 }
2201
xfrm_get_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2202 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2203 struct nlattr **attrs)
2204 {
2205 struct net *net = sock_net(skb->sk);
2206 struct xfrm_state *x;
2207 struct sk_buff *r_skb;
2208 int err;
2209 struct km_event c;
2210 u32 mark;
2211 struct xfrm_mark m;
2212 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2213 struct xfrm_usersa_id *id = &p->sa_id;
2214
2215 mark = xfrm_mark_get(attrs, &m);
2216
2217 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2218 if (x == NULL)
2219 return -ESRCH;
2220
2221 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2222 if (r_skb == NULL) {
2223 xfrm_state_put(x);
2224 return -ENOMEM;
2225 }
2226
2227 /*
2228 * XXX: is this lock really needed - none of the other
2229 * gets lock (the concern is things getting updated
2230 * while we are still reading) - jhs
2231 */
2232 spin_lock_bh(&x->lock);
2233 c.data.aevent = p->flags;
2234 c.seq = nlh->nlmsg_seq;
2235 c.portid = nlh->nlmsg_pid;
2236
2237 err = build_aevent(r_skb, x, &c);
2238 BUG_ON(err < 0);
2239
2240 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2241 spin_unlock_bh(&x->lock);
2242 xfrm_state_put(x);
2243 return err;
2244 }
2245
xfrm_new_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2246 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2247 struct nlattr **attrs)
2248 {
2249 struct net *net = sock_net(skb->sk);
2250 struct xfrm_state *x;
2251 struct km_event c;
2252 int err = -EINVAL;
2253 u32 mark = 0;
2254 struct xfrm_mark m;
2255 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2256 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2257 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2258 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2259 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2260 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2261
2262 if (!lt && !rp && !re && !et && !rt)
2263 return err;
2264
2265 /* pedantic mode - thou shalt sayeth replaceth */
2266 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2267 return err;
2268
2269 mark = xfrm_mark_get(attrs, &m);
2270
2271 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2272 if (x == NULL)
2273 return -ESRCH;
2274
2275 if (x->km.state != XFRM_STATE_VALID)
2276 goto out;
2277
2278 err = xfrm_replay_verify_len(x->replay_esn, re);
2279 if (err)
2280 goto out;
2281
2282 spin_lock_bh(&x->lock);
2283 xfrm_update_ae_params(x, attrs, 1);
2284 spin_unlock_bh(&x->lock);
2285
2286 c.event = nlh->nlmsg_type;
2287 c.seq = nlh->nlmsg_seq;
2288 c.portid = nlh->nlmsg_pid;
2289 c.data.aevent = XFRM_AE_CU;
2290 km_state_notify(x, &c);
2291 err = 0;
2292 out:
2293 xfrm_state_put(x);
2294 return err;
2295 }
2296
xfrm_flush_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2297 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2298 struct nlattr **attrs)
2299 {
2300 struct net *net = sock_net(skb->sk);
2301 struct km_event c;
2302 u8 type = XFRM_POLICY_TYPE_MAIN;
2303 int err;
2304
2305 err = copy_from_user_policy_type(&type, attrs);
2306 if (err)
2307 return err;
2308
2309 err = xfrm_policy_flush(net, type, true);
2310 if (err) {
2311 if (err == -ESRCH) /* empty table */
2312 return 0;
2313 return err;
2314 }
2315
2316 c.data.type = type;
2317 c.event = nlh->nlmsg_type;
2318 c.seq = nlh->nlmsg_seq;
2319 c.portid = nlh->nlmsg_pid;
2320 c.net = net;
2321 km_policy_notify(NULL, 0, &c);
2322 return 0;
2323 }
2324
xfrm_add_pol_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2325 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2326 struct nlattr **attrs)
2327 {
2328 struct net *net = sock_net(skb->sk);
2329 struct xfrm_policy *xp;
2330 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2331 struct xfrm_userpolicy_info *p = &up->pol;
2332 u8 type = XFRM_POLICY_TYPE_MAIN;
2333 int err = -ENOENT;
2334 struct xfrm_mark m;
2335 u32 if_id = 0;
2336
2337 err = copy_from_user_policy_type(&type, attrs);
2338 if (err)
2339 return err;
2340
2341 err = verify_policy_dir(p->dir);
2342 if (err)
2343 return err;
2344
2345 if (attrs[XFRMA_IF_ID])
2346 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2347
2348 xfrm_mark_get(attrs, &m);
2349
2350 if (p->index)
2351 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2352 0, &err);
2353 else {
2354 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2355 struct xfrm_sec_ctx *ctx;
2356
2357 err = verify_sec_ctx_len(attrs);
2358 if (err)
2359 return err;
2360
2361 ctx = NULL;
2362 if (rt) {
2363 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2364
2365 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2366 if (err)
2367 return err;
2368 }
2369 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2370 &p->sel, ctx, 0, &err);
2371 security_xfrm_policy_free(ctx);
2372 }
2373 if (xp == NULL)
2374 return -ENOENT;
2375
2376 if (unlikely(xp->walk.dead))
2377 goto out;
2378
2379 err = 0;
2380 if (up->hard) {
2381 xfrm_policy_delete(xp, p->dir);
2382 xfrm_audit_policy_delete(xp, 1, true);
2383 }
2384 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2385
2386 out:
2387 xfrm_pol_put(xp);
2388 return err;
2389 }
2390
xfrm_add_sa_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2391 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2392 struct nlattr **attrs)
2393 {
2394 struct net *net = sock_net(skb->sk);
2395 struct xfrm_state *x;
2396 int err;
2397 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2398 struct xfrm_usersa_info *p = &ue->state;
2399 struct xfrm_mark m;
2400 u32 mark = xfrm_mark_get(attrs, &m);
2401
2402 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2403
2404 err = -ENOENT;
2405 if (x == NULL)
2406 return err;
2407
2408 spin_lock_bh(&x->lock);
2409 err = -EINVAL;
2410 if (x->km.state != XFRM_STATE_VALID)
2411 goto out;
2412 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2413
2414 if (ue->hard) {
2415 __xfrm_state_delete(x);
2416 xfrm_audit_state_delete(x, 1, true);
2417 }
2418 err = 0;
2419 out:
2420 spin_unlock_bh(&x->lock);
2421 xfrm_state_put(x);
2422 return err;
2423 }
2424
xfrm_add_acquire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2425 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2426 struct nlattr **attrs)
2427 {
2428 struct net *net = sock_net(skb->sk);
2429 struct xfrm_policy *xp;
2430 struct xfrm_user_tmpl *ut;
2431 int i;
2432 struct nlattr *rt = attrs[XFRMA_TMPL];
2433 struct xfrm_mark mark;
2434
2435 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2436 struct xfrm_state *x = xfrm_state_alloc(net);
2437 int err = -ENOMEM;
2438
2439 if (!x)
2440 goto nomem;
2441
2442 xfrm_mark_get(attrs, &mark);
2443
2444 err = verify_newpolicy_info(&ua->policy);
2445 if (err)
2446 goto free_state;
2447 err = verify_sec_ctx_len(attrs);
2448 if (err)
2449 goto free_state;
2450
2451 /* build an XP */
2452 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2453 if (!xp)
2454 goto free_state;
2455
2456 memcpy(&x->id, &ua->id, sizeof(ua->id));
2457 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2458 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2459 xp->mark.m = x->mark.m = mark.m;
2460 xp->mark.v = x->mark.v = mark.v;
2461 ut = nla_data(rt);
2462 /* extract the templates and for each call km_key */
2463 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2464 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2465 memcpy(&x->id, &t->id, sizeof(x->id));
2466 x->props.mode = t->mode;
2467 x->props.reqid = t->reqid;
2468 x->props.family = ut->family;
2469 t->aalgos = ua->aalgos;
2470 t->ealgos = ua->ealgos;
2471 t->calgos = ua->calgos;
2472 err = km_query(x, t, xp);
2473
2474 }
2475
2476 xfrm_state_free(x);
2477 kfree(xp);
2478
2479 return 0;
2480
2481 free_state:
2482 xfrm_state_free(x);
2483 nomem:
2484 return err;
2485 }
2486
2487 #ifdef CONFIG_XFRM_MIGRATE
copy_from_user_migrate(struct xfrm_migrate * ma,struct xfrm_kmaddress * k,struct nlattr ** attrs,int * num)2488 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2489 struct xfrm_kmaddress *k,
2490 struct nlattr **attrs, int *num)
2491 {
2492 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2493 struct xfrm_user_migrate *um;
2494 int i, num_migrate;
2495
2496 if (k != NULL) {
2497 struct xfrm_user_kmaddress *uk;
2498
2499 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2500 memcpy(&k->local, &uk->local, sizeof(k->local));
2501 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2502 k->family = uk->family;
2503 k->reserved = uk->reserved;
2504 }
2505
2506 um = nla_data(rt);
2507 num_migrate = nla_len(rt) / sizeof(*um);
2508
2509 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2510 return -EINVAL;
2511
2512 for (i = 0; i < num_migrate; i++, um++, ma++) {
2513 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2514 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2515 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2516 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2517
2518 ma->proto = um->proto;
2519 ma->mode = um->mode;
2520 ma->reqid = um->reqid;
2521
2522 ma->old_family = um->old_family;
2523 ma->new_family = um->new_family;
2524 }
2525
2526 *num = i;
2527 return 0;
2528 }
2529
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2530 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2531 struct nlattr **attrs)
2532 {
2533 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2534 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2535 struct xfrm_kmaddress km, *kmp;
2536 u8 type;
2537 int err;
2538 int n = 0;
2539 struct net *net = sock_net(skb->sk);
2540 struct xfrm_encap_tmpl *encap = NULL;
2541 u32 if_id = 0;
2542
2543 if (attrs[XFRMA_MIGRATE] == NULL)
2544 return -EINVAL;
2545
2546 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2547
2548 err = copy_from_user_policy_type(&type, attrs);
2549 if (err)
2550 return err;
2551
2552 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2553 if (err)
2554 return err;
2555
2556 if (!n)
2557 return 0;
2558
2559 if (attrs[XFRMA_ENCAP]) {
2560 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2561 sizeof(*encap), GFP_KERNEL);
2562 if (!encap)
2563 return 0;
2564 }
2565
2566 if (attrs[XFRMA_IF_ID])
2567 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2568
2569 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, if_id);
2570
2571 kfree(encap);
2572
2573 return err;
2574 }
2575 #else
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2576 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2577 struct nlattr **attrs)
2578 {
2579 return -ENOPROTOOPT;
2580 }
2581 #endif
2582
2583 #ifdef CONFIG_XFRM_MIGRATE
copy_to_user_migrate(const struct xfrm_migrate * m,struct sk_buff * skb)2584 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2585 {
2586 struct xfrm_user_migrate um;
2587
2588 memset(&um, 0, sizeof(um));
2589 um.proto = m->proto;
2590 um.mode = m->mode;
2591 um.reqid = m->reqid;
2592 um.old_family = m->old_family;
2593 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2594 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2595 um.new_family = m->new_family;
2596 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2597 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2598
2599 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2600 }
2601
copy_to_user_kmaddress(const struct xfrm_kmaddress * k,struct sk_buff * skb)2602 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2603 {
2604 struct xfrm_user_kmaddress uk;
2605
2606 memset(&uk, 0, sizeof(uk));
2607 uk.family = k->family;
2608 uk.reserved = k->reserved;
2609 memcpy(&uk.local, &k->local, sizeof(uk.local));
2610 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2611
2612 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2613 }
2614
xfrm_migrate_msgsize(int num_migrate,int with_kma,int with_encp)2615 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2616 int with_encp)
2617 {
2618 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2619 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2620 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2621 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2622 + userpolicy_type_attrsize();
2623 }
2624
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)2625 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2626 int num_migrate, const struct xfrm_kmaddress *k,
2627 const struct xfrm_selector *sel,
2628 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2629 {
2630 const struct xfrm_migrate *mp;
2631 struct xfrm_userpolicy_id *pol_id;
2632 struct nlmsghdr *nlh;
2633 int i, err;
2634
2635 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2636 if (nlh == NULL)
2637 return -EMSGSIZE;
2638
2639 pol_id = nlmsg_data(nlh);
2640 /* copy data from selector, dir, and type to the pol_id */
2641 memset(pol_id, 0, sizeof(*pol_id));
2642 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2643 pol_id->dir = dir;
2644
2645 if (k != NULL) {
2646 err = copy_to_user_kmaddress(k, skb);
2647 if (err)
2648 goto out_cancel;
2649 }
2650 if (encap) {
2651 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2652 if (err)
2653 goto out_cancel;
2654 }
2655 err = copy_to_user_policy_type(type, skb);
2656 if (err)
2657 goto out_cancel;
2658 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2659 err = copy_to_user_migrate(mp, skb);
2660 if (err)
2661 goto out_cancel;
2662 }
2663
2664 nlmsg_end(skb, nlh);
2665 return 0;
2666
2667 out_cancel:
2668 nlmsg_cancel(skb, nlh);
2669 return err;
2670 }
2671
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)2672 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2673 const struct xfrm_migrate *m, int num_migrate,
2674 const struct xfrm_kmaddress *k,
2675 const struct xfrm_encap_tmpl *encap)
2676 {
2677 struct net *net = &init_net;
2678 struct sk_buff *skb;
2679 int err;
2680
2681 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2682 GFP_ATOMIC);
2683 if (skb == NULL)
2684 return -ENOMEM;
2685
2686 /* build migrate */
2687 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2688 BUG_ON(err < 0);
2689
2690 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2691 }
2692 #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)2693 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2694 const struct xfrm_migrate *m, int num_migrate,
2695 const struct xfrm_kmaddress *k,
2696 const struct xfrm_encap_tmpl *encap)
2697 {
2698 return -ENOPROTOOPT;
2699 }
2700 #endif
2701
2702 #define XMSGSIZE(type) sizeof(struct type)
2703
2704 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2705 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2706 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2707 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2708 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2709 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2710 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2711 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2712 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2713 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2714 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2715 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2716 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2717 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2718 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2719 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2720 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2721 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2722 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2723 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2724 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2725 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2726 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
2727 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
2728 };
2729 EXPORT_SYMBOL_GPL(xfrm_msg_min);
2730
2731 #undef XMSGSIZE
2732
2733 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2734 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2735 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2736 [XFRMA_LASTUSED] = { .type = NLA_U64},
2737 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2738 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2739 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2740 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2741 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2742 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2743 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2744 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
2745 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2746 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2747 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2748 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2749 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2750 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2751 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2752 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2753 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2754 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2755 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2756 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2757 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2758 [XFRMA_PROTO] = { .type = NLA_U8 },
2759 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2760 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2761 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2762 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2763 [XFRMA_IF_ID] = { .type = NLA_U32 },
2764 [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
2765 };
2766 EXPORT_SYMBOL_GPL(xfrma_policy);
2767
2768 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2769 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2770 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2771 };
2772
2773 static const struct xfrm_link {
2774 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2775 int (*start)(struct netlink_callback *);
2776 int (*dump)(struct sk_buff *, struct netlink_callback *);
2777 int (*done)(struct netlink_callback *);
2778 const struct nla_policy *nla_pol;
2779 int nla_max;
2780 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2781 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2782 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2783 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2784 .dump = xfrm_dump_sa,
2785 .done = xfrm_dump_sa_done },
2786 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2787 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2788 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2789 .start = xfrm_dump_policy_start,
2790 .dump = xfrm_dump_policy,
2791 .done = xfrm_dump_policy_done },
2792 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2793 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2794 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2795 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2796 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2797 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2798 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2799 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2800 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2801 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2802 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2803 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2804 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2805 .nla_pol = xfrma_spd_policy,
2806 .nla_max = XFRMA_SPD_MAX },
2807 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2808 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
2809 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
2810 };
2811
xfrm_user_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)2812 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2813 struct netlink_ext_ack *extack)
2814 {
2815 struct net *net = sock_net(skb->sk);
2816 struct nlattr *attrs[XFRMA_MAX+1];
2817 const struct xfrm_link *link;
2818 struct nlmsghdr *nlh64 = NULL;
2819 int type, err;
2820
2821 type = nlh->nlmsg_type;
2822 if (type > XFRM_MSG_MAX)
2823 return -EINVAL;
2824
2825 type -= XFRM_MSG_BASE;
2826 link = &xfrm_dispatch[type];
2827
2828 /* All operations require privileges, even GET */
2829 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2830 return -EPERM;
2831
2832 if (in_compat_syscall()) {
2833 struct xfrm_translator *xtr = xfrm_get_translator();
2834
2835 if (!xtr)
2836 return -EOPNOTSUPP;
2837
2838 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
2839 link->nla_pol, extack);
2840 xfrm_put_translator(xtr);
2841 if (IS_ERR(nlh64))
2842 return PTR_ERR(nlh64);
2843 if (nlh64)
2844 nlh = nlh64;
2845 }
2846
2847 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2848 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2849 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2850 struct netlink_dump_control c = {
2851 .start = link->start,
2852 .dump = link->dump,
2853 .done = link->done,
2854 };
2855
2856 if (link->dump == NULL) {
2857 err = -EINVAL;
2858 goto err;
2859 }
2860
2861 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2862 goto err;
2863 }
2864
2865 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2866 link->nla_max ? : XFRMA_MAX,
2867 link->nla_pol ? : xfrma_policy, extack);
2868 if (err < 0)
2869 goto err;
2870
2871 if (link->doit == NULL) {
2872 err = -EINVAL;
2873 goto err;
2874 }
2875
2876 err = link->doit(skb, nlh, attrs);
2877
2878 /* We need to free skb allocated in xfrm_alloc_compat() before
2879 * returning from this function, because consume_skb() won't take
2880 * care of frag_list since netlink destructor sets
2881 * sbk->head to NULL. (see netlink_skb_destructor())
2882 */
2883 if (skb_has_frag_list(skb)) {
2884 kfree_skb(skb_shinfo(skb)->frag_list);
2885 skb_shinfo(skb)->frag_list = NULL;
2886 }
2887
2888 err:
2889 kvfree(nlh64);
2890 return err;
2891 }
2892
xfrm_netlink_rcv(struct sk_buff * skb)2893 static void xfrm_netlink_rcv(struct sk_buff *skb)
2894 {
2895 struct net *net = sock_net(skb->sk);
2896
2897 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2898 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2899 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2900 }
2901
xfrm_expire_msgsize(void)2902 static inline unsigned int xfrm_expire_msgsize(void)
2903 {
2904 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2905 + nla_total_size(sizeof(struct xfrm_mark));
2906 }
2907
build_expire(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2908 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2909 {
2910 struct xfrm_user_expire *ue;
2911 struct nlmsghdr *nlh;
2912 int err;
2913
2914 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2915 if (nlh == NULL)
2916 return -EMSGSIZE;
2917
2918 ue = nlmsg_data(nlh);
2919 copy_to_user_state(x, &ue->state);
2920 ue->hard = (c->data.hard != 0) ? 1 : 0;
2921 /* clear the padding bytes */
2922 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2923
2924 err = xfrm_mark_put(skb, &x->mark);
2925 if (err)
2926 return err;
2927
2928 err = xfrm_if_id_put(skb, x->if_id);
2929 if (err)
2930 return err;
2931
2932 nlmsg_end(skb, nlh);
2933 return 0;
2934 }
2935
xfrm_exp_state_notify(struct xfrm_state * x,const struct km_event * c)2936 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2937 {
2938 struct net *net = xs_net(x);
2939 struct sk_buff *skb;
2940
2941 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2942 if (skb == NULL)
2943 return -ENOMEM;
2944
2945 if (build_expire(skb, x, c) < 0) {
2946 kfree_skb(skb);
2947 return -EMSGSIZE;
2948 }
2949
2950 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2951 }
2952
xfrm_aevent_state_notify(struct xfrm_state * x,const struct km_event * c)2953 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2954 {
2955 struct net *net = xs_net(x);
2956 struct sk_buff *skb;
2957 int err;
2958
2959 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2960 if (skb == NULL)
2961 return -ENOMEM;
2962
2963 err = build_aevent(skb, x, c);
2964 BUG_ON(err < 0);
2965
2966 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2967 }
2968
xfrm_notify_sa_flush(const struct km_event * c)2969 static int xfrm_notify_sa_flush(const struct km_event *c)
2970 {
2971 struct net *net = c->net;
2972 struct xfrm_usersa_flush *p;
2973 struct nlmsghdr *nlh;
2974 struct sk_buff *skb;
2975 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2976
2977 skb = nlmsg_new(len, GFP_ATOMIC);
2978 if (skb == NULL)
2979 return -ENOMEM;
2980
2981 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2982 if (nlh == NULL) {
2983 kfree_skb(skb);
2984 return -EMSGSIZE;
2985 }
2986
2987 p = nlmsg_data(nlh);
2988 p->proto = c->data.proto;
2989
2990 nlmsg_end(skb, nlh);
2991
2992 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2993 }
2994
xfrm_sa_len(struct xfrm_state * x)2995 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2996 {
2997 unsigned int l = 0;
2998 if (x->aead)
2999 l += nla_total_size(aead_len(x->aead));
3000 if (x->aalg) {
3001 l += nla_total_size(sizeof(struct xfrm_algo) +
3002 (x->aalg->alg_key_len + 7) / 8);
3003 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3004 }
3005 if (x->ealg)
3006 l += nla_total_size(xfrm_alg_len(x->ealg));
3007 if (x->calg)
3008 l += nla_total_size(sizeof(*x->calg));
3009 if (x->encap)
3010 l += nla_total_size(sizeof(*x->encap));
3011 if (x->tfcpad)
3012 l += nla_total_size(sizeof(x->tfcpad));
3013 if (x->replay_esn)
3014 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3015 else
3016 l += nla_total_size(sizeof(struct xfrm_replay_state));
3017 if (x->security)
3018 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3019 x->security->ctx_len);
3020 if (x->coaddr)
3021 l += nla_total_size(sizeof(*x->coaddr));
3022 if (x->props.extra_flags)
3023 l += nla_total_size(sizeof(x->props.extra_flags));
3024 if (x->xso.dev)
3025 l += nla_total_size(sizeof(struct xfrm_user_offload));
3026 if (x->props.smark.v | x->props.smark.m) {
3027 l += nla_total_size(sizeof(x->props.smark.v));
3028 l += nla_total_size(sizeof(x->props.smark.m));
3029 }
3030 if (x->if_id)
3031 l += nla_total_size(sizeof(x->if_id));
3032
3033 /* Must count x->lastused as it may become non-zero behind our back. */
3034 l += nla_total_size_64bit(sizeof(u64));
3035
3036 if (x->mapping_maxage)
3037 l += nla_total_size(sizeof(x->mapping_maxage));
3038
3039 return l;
3040 }
3041
xfrm_notify_sa(struct xfrm_state * x,const struct km_event * c)3042 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3043 {
3044 struct net *net = xs_net(x);
3045 struct xfrm_usersa_info *p;
3046 struct xfrm_usersa_id *id;
3047 struct nlmsghdr *nlh;
3048 struct sk_buff *skb;
3049 unsigned int len = xfrm_sa_len(x);
3050 unsigned int headlen;
3051 int err;
3052
3053 headlen = sizeof(*p);
3054 if (c->event == XFRM_MSG_DELSA) {
3055 len += nla_total_size(headlen);
3056 headlen = sizeof(*id);
3057 len += nla_total_size(sizeof(struct xfrm_mark));
3058 }
3059 len += NLMSG_ALIGN(headlen);
3060
3061 skb = nlmsg_new(len, GFP_ATOMIC);
3062 if (skb == NULL)
3063 return -ENOMEM;
3064
3065 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3066 err = -EMSGSIZE;
3067 if (nlh == NULL)
3068 goto out_free_skb;
3069
3070 p = nlmsg_data(nlh);
3071 if (c->event == XFRM_MSG_DELSA) {
3072 struct nlattr *attr;
3073
3074 id = nlmsg_data(nlh);
3075 memset(id, 0, sizeof(*id));
3076 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3077 id->spi = x->id.spi;
3078 id->family = x->props.family;
3079 id->proto = x->id.proto;
3080
3081 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3082 err = -EMSGSIZE;
3083 if (attr == NULL)
3084 goto out_free_skb;
3085
3086 p = nla_data(attr);
3087 }
3088 err = copy_to_user_state_extra(x, p, skb);
3089 if (err)
3090 goto out_free_skb;
3091
3092 nlmsg_end(skb, nlh);
3093
3094 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3095
3096 out_free_skb:
3097 kfree_skb(skb);
3098 return err;
3099 }
3100
xfrm_send_state_notify(struct xfrm_state * x,const struct km_event * c)3101 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3102 {
3103
3104 switch (c->event) {
3105 case XFRM_MSG_EXPIRE:
3106 return xfrm_exp_state_notify(x, c);
3107 case XFRM_MSG_NEWAE:
3108 return xfrm_aevent_state_notify(x, c);
3109 case XFRM_MSG_DELSA:
3110 case XFRM_MSG_UPDSA:
3111 case XFRM_MSG_NEWSA:
3112 return xfrm_notify_sa(x, c);
3113 case XFRM_MSG_FLUSHSA:
3114 return xfrm_notify_sa_flush(c);
3115 default:
3116 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3117 c->event);
3118 break;
3119 }
3120
3121 return 0;
3122
3123 }
3124
xfrm_acquire_msgsize(struct xfrm_state * x,struct xfrm_policy * xp)3125 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3126 struct xfrm_policy *xp)
3127 {
3128 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3129 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3130 + nla_total_size(sizeof(struct xfrm_mark))
3131 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3132 + userpolicy_type_attrsize();
3133 }
3134
build_acquire(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3135 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3136 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3137 {
3138 __u32 seq = xfrm_get_acqseq();
3139 struct xfrm_user_acquire *ua;
3140 struct nlmsghdr *nlh;
3141 int err;
3142
3143 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3144 if (nlh == NULL)
3145 return -EMSGSIZE;
3146
3147 ua = nlmsg_data(nlh);
3148 memcpy(&ua->id, &x->id, sizeof(ua->id));
3149 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3150 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3151 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3152 ua->aalgos = xt->aalgos;
3153 ua->ealgos = xt->ealgos;
3154 ua->calgos = xt->calgos;
3155 ua->seq = x->km.seq = seq;
3156
3157 err = copy_to_user_tmpl(xp, skb);
3158 if (!err)
3159 err = copy_to_user_state_sec_ctx(x, skb);
3160 if (!err)
3161 err = copy_to_user_policy_type(xp->type, skb);
3162 if (!err)
3163 err = xfrm_mark_put(skb, &xp->mark);
3164 if (!err)
3165 err = xfrm_if_id_put(skb, xp->if_id);
3166 if (err) {
3167 nlmsg_cancel(skb, nlh);
3168 return err;
3169 }
3170
3171 nlmsg_end(skb, nlh);
3172 return 0;
3173 }
3174
xfrm_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3175 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3176 struct xfrm_policy *xp)
3177 {
3178 struct net *net = xs_net(x);
3179 struct sk_buff *skb;
3180 int err;
3181
3182 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3183 if (skb == NULL)
3184 return -ENOMEM;
3185
3186 err = build_acquire(skb, x, xt, xp);
3187 BUG_ON(err < 0);
3188
3189 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3190 }
3191
3192 /* User gives us xfrm_user_policy_info followed by an array of 0
3193 * or more templates.
3194 */
xfrm_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3195 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3196 u8 *data, int len, int *dir)
3197 {
3198 struct net *net = sock_net(sk);
3199 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3200 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3201 struct xfrm_policy *xp;
3202 int nr;
3203
3204 switch (sk->sk_family) {
3205 case AF_INET:
3206 if (opt != IP_XFRM_POLICY) {
3207 *dir = -EOPNOTSUPP;
3208 return NULL;
3209 }
3210 break;
3211 #if IS_ENABLED(CONFIG_IPV6)
3212 case AF_INET6:
3213 if (opt != IPV6_XFRM_POLICY) {
3214 *dir = -EOPNOTSUPP;
3215 return NULL;
3216 }
3217 break;
3218 #endif
3219 default:
3220 *dir = -EINVAL;
3221 return NULL;
3222 }
3223
3224 *dir = -EINVAL;
3225
3226 if (len < sizeof(*p) ||
3227 verify_newpolicy_info(p))
3228 return NULL;
3229
3230 nr = ((len - sizeof(*p)) / sizeof(*ut));
3231 if (validate_tmpl(nr, ut, p->sel.family))
3232 return NULL;
3233
3234 if (p->dir > XFRM_POLICY_OUT)
3235 return NULL;
3236
3237 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3238 if (xp == NULL) {
3239 *dir = -ENOBUFS;
3240 return NULL;
3241 }
3242
3243 copy_from_user_policy(xp, p);
3244 xp->type = XFRM_POLICY_TYPE_MAIN;
3245 copy_templates(xp, ut, nr);
3246
3247 *dir = p->dir;
3248
3249 return xp;
3250 }
3251
xfrm_polexpire_msgsize(struct xfrm_policy * xp)3252 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3253 {
3254 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3255 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3256 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3257 + nla_total_size(sizeof(struct xfrm_mark))
3258 + userpolicy_type_attrsize();
3259 }
3260
build_polexpire(struct sk_buff * skb,struct xfrm_policy * xp,int dir,const struct km_event * c)3261 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3262 int dir, const struct km_event *c)
3263 {
3264 struct xfrm_user_polexpire *upe;
3265 int hard = c->data.hard;
3266 struct nlmsghdr *nlh;
3267 int err;
3268
3269 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3270 if (nlh == NULL)
3271 return -EMSGSIZE;
3272
3273 upe = nlmsg_data(nlh);
3274 copy_to_user_policy(xp, &upe->pol, dir);
3275 err = copy_to_user_tmpl(xp, skb);
3276 if (!err)
3277 err = copy_to_user_sec_ctx(xp, skb);
3278 if (!err)
3279 err = copy_to_user_policy_type(xp->type, skb);
3280 if (!err)
3281 err = xfrm_mark_put(skb, &xp->mark);
3282 if (!err)
3283 err = xfrm_if_id_put(skb, xp->if_id);
3284 if (err) {
3285 nlmsg_cancel(skb, nlh);
3286 return err;
3287 }
3288 upe->hard = !!hard;
3289
3290 nlmsg_end(skb, nlh);
3291 return 0;
3292 }
3293
xfrm_exp_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3294 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3295 {
3296 struct net *net = xp_net(xp);
3297 struct sk_buff *skb;
3298 int err;
3299
3300 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3301 if (skb == NULL)
3302 return -ENOMEM;
3303
3304 err = build_polexpire(skb, xp, dir, c);
3305 BUG_ON(err < 0);
3306
3307 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3308 }
3309
xfrm_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)3310 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3311 {
3312 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3313 struct net *net = xp_net(xp);
3314 struct xfrm_userpolicy_info *p;
3315 struct xfrm_userpolicy_id *id;
3316 struct nlmsghdr *nlh;
3317 struct sk_buff *skb;
3318 unsigned int headlen;
3319 int err;
3320
3321 headlen = sizeof(*p);
3322 if (c->event == XFRM_MSG_DELPOLICY) {
3323 len += nla_total_size(headlen);
3324 headlen = sizeof(*id);
3325 }
3326 len += userpolicy_type_attrsize();
3327 len += nla_total_size(sizeof(struct xfrm_mark));
3328 len += NLMSG_ALIGN(headlen);
3329
3330 skb = nlmsg_new(len, GFP_ATOMIC);
3331 if (skb == NULL)
3332 return -ENOMEM;
3333
3334 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3335 err = -EMSGSIZE;
3336 if (nlh == NULL)
3337 goto out_free_skb;
3338
3339 p = nlmsg_data(nlh);
3340 if (c->event == XFRM_MSG_DELPOLICY) {
3341 struct nlattr *attr;
3342
3343 id = nlmsg_data(nlh);
3344 memset(id, 0, sizeof(*id));
3345 id->dir = dir;
3346 if (c->data.byid)
3347 id->index = xp->index;
3348 else
3349 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3350
3351 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3352 err = -EMSGSIZE;
3353 if (attr == NULL)
3354 goto out_free_skb;
3355
3356 p = nla_data(attr);
3357 }
3358
3359 copy_to_user_policy(xp, p, dir);
3360 err = copy_to_user_tmpl(xp, skb);
3361 if (!err)
3362 err = copy_to_user_policy_type(xp->type, skb);
3363 if (!err)
3364 err = xfrm_mark_put(skb, &xp->mark);
3365 if (!err)
3366 err = xfrm_if_id_put(skb, xp->if_id);
3367 if (err)
3368 goto out_free_skb;
3369
3370 nlmsg_end(skb, nlh);
3371
3372 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3373
3374 out_free_skb:
3375 kfree_skb(skb);
3376 return err;
3377 }
3378
xfrm_notify_policy_flush(const struct km_event * c)3379 static int xfrm_notify_policy_flush(const struct km_event *c)
3380 {
3381 struct net *net = c->net;
3382 struct nlmsghdr *nlh;
3383 struct sk_buff *skb;
3384 int err;
3385
3386 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3387 if (skb == NULL)
3388 return -ENOMEM;
3389
3390 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3391 err = -EMSGSIZE;
3392 if (nlh == NULL)
3393 goto out_free_skb;
3394 err = copy_to_user_policy_type(c->data.type, skb);
3395 if (err)
3396 goto out_free_skb;
3397
3398 nlmsg_end(skb, nlh);
3399
3400 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3401
3402 out_free_skb:
3403 kfree_skb(skb);
3404 return err;
3405 }
3406
xfrm_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3407 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3408 {
3409
3410 switch (c->event) {
3411 case XFRM_MSG_NEWPOLICY:
3412 case XFRM_MSG_UPDPOLICY:
3413 case XFRM_MSG_DELPOLICY:
3414 return xfrm_notify_policy(xp, dir, c);
3415 case XFRM_MSG_FLUSHPOLICY:
3416 return xfrm_notify_policy_flush(c);
3417 case XFRM_MSG_POLEXPIRE:
3418 return xfrm_exp_policy_notify(xp, dir, c);
3419 default:
3420 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3421 c->event);
3422 }
3423
3424 return 0;
3425
3426 }
3427
xfrm_report_msgsize(void)3428 static inline unsigned int xfrm_report_msgsize(void)
3429 {
3430 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3431 }
3432
build_report(struct sk_buff * skb,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3433 static int build_report(struct sk_buff *skb, u8 proto,
3434 struct xfrm_selector *sel, xfrm_address_t *addr)
3435 {
3436 struct xfrm_user_report *ur;
3437 struct nlmsghdr *nlh;
3438
3439 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3440 if (nlh == NULL)
3441 return -EMSGSIZE;
3442
3443 ur = nlmsg_data(nlh);
3444 ur->proto = proto;
3445 memcpy(&ur->sel, sel, sizeof(ur->sel));
3446
3447 if (addr) {
3448 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3449 if (err) {
3450 nlmsg_cancel(skb, nlh);
3451 return err;
3452 }
3453 }
3454 nlmsg_end(skb, nlh);
3455 return 0;
3456 }
3457
xfrm_send_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3458 static int xfrm_send_report(struct net *net, u8 proto,
3459 struct xfrm_selector *sel, xfrm_address_t *addr)
3460 {
3461 struct sk_buff *skb;
3462 int err;
3463
3464 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3465 if (skb == NULL)
3466 return -ENOMEM;
3467
3468 err = build_report(skb, proto, sel, addr);
3469 BUG_ON(err < 0);
3470
3471 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3472 }
3473
xfrm_mapping_msgsize(void)3474 static inline unsigned int xfrm_mapping_msgsize(void)
3475 {
3476 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3477 }
3478
build_mapping(struct sk_buff * skb,struct xfrm_state * x,xfrm_address_t * new_saddr,__be16 new_sport)3479 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3480 xfrm_address_t *new_saddr, __be16 new_sport)
3481 {
3482 struct xfrm_user_mapping *um;
3483 struct nlmsghdr *nlh;
3484
3485 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3486 if (nlh == NULL)
3487 return -EMSGSIZE;
3488
3489 um = nlmsg_data(nlh);
3490
3491 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3492 um->id.spi = x->id.spi;
3493 um->id.family = x->props.family;
3494 um->id.proto = x->id.proto;
3495 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3496 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3497 um->new_sport = new_sport;
3498 um->old_sport = x->encap->encap_sport;
3499 um->reqid = x->props.reqid;
3500
3501 nlmsg_end(skb, nlh);
3502 return 0;
3503 }
3504
xfrm_send_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)3505 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3506 __be16 sport)
3507 {
3508 struct net *net = xs_net(x);
3509 struct sk_buff *skb;
3510 int err;
3511
3512 if (x->id.proto != IPPROTO_ESP)
3513 return -EINVAL;
3514
3515 if (!x->encap)
3516 return -EINVAL;
3517
3518 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3519 if (skb == NULL)
3520 return -ENOMEM;
3521
3522 err = build_mapping(skb, x, ipaddr, sport);
3523 BUG_ON(err < 0);
3524
3525 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3526 }
3527
xfrm_is_alive(const struct km_event * c)3528 static bool xfrm_is_alive(const struct km_event *c)
3529 {
3530 return (bool)xfrm_acquire_is_on(c->net);
3531 }
3532
3533 static struct xfrm_mgr netlink_mgr = {
3534 .notify = xfrm_send_state_notify,
3535 .acquire = xfrm_send_acquire,
3536 .compile_policy = xfrm_compile_policy,
3537 .notify_policy = xfrm_send_policy_notify,
3538 .report = xfrm_send_report,
3539 .migrate = xfrm_send_migrate,
3540 .new_mapping = xfrm_send_mapping,
3541 .is_alive = xfrm_is_alive,
3542 };
3543
xfrm_user_net_init(struct net * net)3544 static int __net_init xfrm_user_net_init(struct net *net)
3545 {
3546 struct sock *nlsk;
3547 struct netlink_kernel_cfg cfg = {
3548 .groups = XFRMNLGRP_MAX,
3549 .input = xfrm_netlink_rcv,
3550 };
3551
3552 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3553 if (nlsk == NULL)
3554 return -ENOMEM;
3555 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3556 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3557 return 0;
3558 }
3559
xfrm_user_net_exit(struct list_head * net_exit_list)3560 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3561 {
3562 struct net *net;
3563 list_for_each_entry(net, net_exit_list, exit_list)
3564 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3565 synchronize_net();
3566 list_for_each_entry(net, net_exit_list, exit_list)
3567 netlink_kernel_release(net->xfrm.nlsk_stash);
3568 }
3569
3570 static struct pernet_operations xfrm_user_net_ops = {
3571 .init = xfrm_user_net_init,
3572 .exit_batch = xfrm_user_net_exit,
3573 };
3574
xfrm_user_init(void)3575 static int __init xfrm_user_init(void)
3576 {
3577 int rv;
3578
3579 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3580
3581 rv = register_pernet_subsys(&xfrm_user_net_ops);
3582 if (rv < 0)
3583 return rv;
3584 rv = xfrm_register_km(&netlink_mgr);
3585 if (rv < 0)
3586 unregister_pernet_subsys(&xfrm_user_net_ops);
3587 return rv;
3588 }
3589
xfrm_user_exit(void)3590 static void __exit xfrm_user_exit(void)
3591 {
3592 xfrm_unregister_km(&netlink_mgr);
3593 unregister_pernet_subsys(&xfrm_user_net_ops);
3594 }
3595
3596 module_init(xfrm_user_init);
3597 module_exit(xfrm_user_exit);
3598 MODULE_LICENSE("GPL");
3599 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3600