1 // SPDX-License-Identifier: GPL-2.0-only
2 /* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
14 #include <linux/crypto.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/socket.h>
20 #include <linux/string.h>
21 #include <linux/net.h>
22 #include <linux/skbuff.h>
23 #include <linux/pfkeyv2.h>
24 #include <linux/ipsec.h>
25 #include <linux/init.h>
26 #include <linux/security.h>
27 #include <net/sock.h>
28 #include <net/xfrm.h>
29 #include <net/netlink.h>
30 #include <net/ah.h>
31 #include <linux/uaccess.h>
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <linux/in6.h>
34 #endif
35 #include <asm/unaligned.h>
36
verify_one_alg(struct nlattr ** attrs,enum xfrm_attr_type_t type)37 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
38 {
39 struct nlattr *rt = attrs[type];
40 struct xfrm_algo *algp;
41
42 if (!rt)
43 return 0;
44
45 algp = nla_data(rt);
46 if (nla_len(rt) < (int)xfrm_alg_len(algp))
47 return -EINVAL;
48
49 switch (type) {
50 case XFRMA_ALG_AUTH:
51 case XFRMA_ALG_CRYPT:
52 case XFRMA_ALG_COMP:
53 break;
54
55 default:
56 return -EINVAL;
57 }
58
59 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
60 return 0;
61 }
62
verify_auth_trunc(struct nlattr ** attrs)63 static int verify_auth_trunc(struct nlattr **attrs)
64 {
65 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
66 struct xfrm_algo_auth *algp;
67
68 if (!rt)
69 return 0;
70
71 algp = nla_data(rt);
72 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
73 return -EINVAL;
74
75 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
76 return 0;
77 }
78
verify_aead(struct nlattr ** attrs)79 static int verify_aead(struct nlattr **attrs)
80 {
81 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
82 struct xfrm_algo_aead *algp;
83
84 if (!rt)
85 return 0;
86
87 algp = nla_data(rt);
88 if (nla_len(rt) < (int)aead_len(algp))
89 return -EINVAL;
90
91 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
92 return 0;
93 }
94
verify_one_addr(struct nlattr ** attrs,enum xfrm_attr_type_t type,xfrm_address_t ** addrp)95 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
96 xfrm_address_t **addrp)
97 {
98 struct nlattr *rt = attrs[type];
99
100 if (rt && addrp)
101 *addrp = nla_data(rt);
102 }
103
verify_sec_ctx_len(struct nlattr ** attrs)104 static inline int verify_sec_ctx_len(struct nlattr **attrs)
105 {
106 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
107 struct xfrm_user_sec_ctx *uctx;
108
109 if (!rt)
110 return 0;
111
112 uctx = nla_data(rt);
113 if (uctx->len > nla_len(rt) ||
114 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
115 return -EINVAL;
116
117 return 0;
118 }
119
verify_replay(struct xfrm_usersa_info * p,struct nlattr ** attrs)120 static inline int verify_replay(struct xfrm_usersa_info *p,
121 struct nlattr **attrs)
122 {
123 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
124 struct xfrm_replay_state_esn *rs;
125
126 if (!rt)
127 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
128
129 rs = nla_data(rt);
130
131 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
132 return -EINVAL;
133
134 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
135 nla_len(rt) != sizeof(*rs))
136 return -EINVAL;
137
138 /* As only ESP and AH support ESN feature. */
139 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
140 return -EINVAL;
141
142 if (p->replay_window != 0)
143 return -EINVAL;
144
145 return 0;
146 }
147
verify_newsa_info(struct xfrm_usersa_info * p,struct nlattr ** attrs)148 static int verify_newsa_info(struct xfrm_usersa_info *p,
149 struct nlattr **attrs)
150 {
151 int err;
152
153 err = -EINVAL;
154 switch (p->family) {
155 case AF_INET:
156 break;
157
158 case AF_INET6:
159 #if IS_ENABLED(CONFIG_IPV6)
160 break;
161 #else
162 err = -EAFNOSUPPORT;
163 goto out;
164 #endif
165
166 default:
167 goto out;
168 }
169
170 switch (p->sel.family) {
171 case AF_UNSPEC:
172 break;
173
174 case AF_INET:
175 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
176 goto out;
177
178 break;
179
180 case AF_INET6:
181 #if IS_ENABLED(CONFIG_IPV6)
182 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
183 goto out;
184
185 break;
186 #else
187 err = -EAFNOSUPPORT;
188 goto out;
189 #endif
190
191 default:
192 goto out;
193 }
194
195 err = -EINVAL;
196 switch (p->id.proto) {
197 case IPPROTO_AH:
198 if ((!attrs[XFRMA_ALG_AUTH] &&
199 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
200 attrs[XFRMA_ALG_AEAD] ||
201 attrs[XFRMA_ALG_CRYPT] ||
202 attrs[XFRMA_ALG_COMP] ||
203 attrs[XFRMA_TFCPAD])
204 goto out;
205 break;
206
207 case IPPROTO_ESP:
208 if (attrs[XFRMA_ALG_COMP])
209 goto out;
210 if (!attrs[XFRMA_ALG_AUTH] &&
211 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
212 !attrs[XFRMA_ALG_CRYPT] &&
213 !attrs[XFRMA_ALG_AEAD])
214 goto out;
215 if ((attrs[XFRMA_ALG_AUTH] ||
216 attrs[XFRMA_ALG_AUTH_TRUNC] ||
217 attrs[XFRMA_ALG_CRYPT]) &&
218 attrs[XFRMA_ALG_AEAD])
219 goto out;
220 if (attrs[XFRMA_TFCPAD] &&
221 p->mode != XFRM_MODE_TUNNEL)
222 goto out;
223 break;
224
225 case IPPROTO_COMP:
226 if (!attrs[XFRMA_ALG_COMP] ||
227 attrs[XFRMA_ALG_AEAD] ||
228 attrs[XFRMA_ALG_AUTH] ||
229 attrs[XFRMA_ALG_AUTH_TRUNC] ||
230 attrs[XFRMA_ALG_CRYPT] ||
231 attrs[XFRMA_TFCPAD] ||
232 (ntohl(p->id.spi) >= 0x10000))
233 goto out;
234 break;
235
236 #if IS_ENABLED(CONFIG_IPV6)
237 case IPPROTO_DSTOPTS:
238 case IPPROTO_ROUTING:
239 if (attrs[XFRMA_ALG_COMP] ||
240 attrs[XFRMA_ALG_AUTH] ||
241 attrs[XFRMA_ALG_AUTH_TRUNC] ||
242 attrs[XFRMA_ALG_AEAD] ||
243 attrs[XFRMA_ALG_CRYPT] ||
244 attrs[XFRMA_ENCAP] ||
245 attrs[XFRMA_SEC_CTX] ||
246 attrs[XFRMA_TFCPAD] ||
247 !attrs[XFRMA_COADDR])
248 goto out;
249 break;
250 #endif
251
252 default:
253 goto out;
254 }
255
256 if ((err = verify_aead(attrs)))
257 goto out;
258 if ((err = verify_auth_trunc(attrs)))
259 goto out;
260 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
261 goto out;
262 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
263 goto out;
264 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
265 goto out;
266 if ((err = verify_sec_ctx_len(attrs)))
267 goto out;
268 if ((err = verify_replay(p, attrs)))
269 goto out;
270
271 err = -EINVAL;
272 switch (p->mode) {
273 case XFRM_MODE_TRANSPORT:
274 case XFRM_MODE_TUNNEL:
275 case XFRM_MODE_ROUTEOPTIMIZATION:
276 case XFRM_MODE_BEET:
277 break;
278
279 default:
280 goto out;
281 }
282
283 err = 0;
284
285 out:
286 return err;
287 }
288
attach_one_algo(struct xfrm_algo ** algpp,u8 * props,struct xfrm_algo_desc * (* get_byname)(const char *,int),struct nlattr * rta)289 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
290 struct xfrm_algo_desc *(*get_byname)(const char *, int),
291 struct nlattr *rta)
292 {
293 struct xfrm_algo *p, *ualg;
294 struct xfrm_algo_desc *algo;
295
296 if (!rta)
297 return 0;
298
299 ualg = nla_data(rta);
300
301 algo = get_byname(ualg->alg_name, 1);
302 if (!algo)
303 return -ENOSYS;
304 *props = algo->desc.sadb_alg_id;
305
306 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
307 if (!p)
308 return -ENOMEM;
309
310 strcpy(p->alg_name, algo->name);
311 *algpp = p;
312 return 0;
313 }
314
attach_crypt(struct xfrm_state * x,struct nlattr * rta)315 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
316 {
317 struct xfrm_algo *p, *ualg;
318 struct xfrm_algo_desc *algo;
319
320 if (!rta)
321 return 0;
322
323 ualg = nla_data(rta);
324
325 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
326 if (!algo)
327 return -ENOSYS;
328 x->props.ealgo = algo->desc.sadb_alg_id;
329
330 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
331 if (!p)
332 return -ENOMEM;
333
334 strcpy(p->alg_name, algo->name);
335 x->ealg = p;
336 x->geniv = algo->uinfo.encr.geniv;
337 return 0;
338 }
339
attach_auth(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta)340 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
341 struct nlattr *rta)
342 {
343 struct xfrm_algo *ualg;
344 struct xfrm_algo_auth *p;
345 struct xfrm_algo_desc *algo;
346
347 if (!rta)
348 return 0;
349
350 ualg = nla_data(rta);
351
352 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
353 if (!algo)
354 return -ENOSYS;
355 *props = algo->desc.sadb_alg_id;
356
357 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
358 if (!p)
359 return -ENOMEM;
360
361 strcpy(p->alg_name, algo->name);
362 p->alg_key_len = ualg->alg_key_len;
363 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
364 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
365
366 *algpp = p;
367 return 0;
368 }
369
attach_auth_trunc(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta)370 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
371 struct nlattr *rta)
372 {
373 struct xfrm_algo_auth *p, *ualg;
374 struct xfrm_algo_desc *algo;
375
376 if (!rta)
377 return 0;
378
379 ualg = nla_data(rta);
380
381 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
382 if (!algo)
383 return -ENOSYS;
384 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
385 return -EINVAL;
386 *props = algo->desc.sadb_alg_id;
387
388 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
389 if (!p)
390 return -ENOMEM;
391
392 strcpy(p->alg_name, algo->name);
393 if (!p->alg_trunc_len)
394 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
395
396 *algpp = p;
397 return 0;
398 }
399
attach_aead(struct xfrm_state * x,struct nlattr * rta)400 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
401 {
402 struct xfrm_algo_aead *p, *ualg;
403 struct xfrm_algo_desc *algo;
404
405 if (!rta)
406 return 0;
407
408 ualg = nla_data(rta);
409
410 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
411 if (!algo)
412 return -ENOSYS;
413 x->props.ealgo = algo->desc.sadb_alg_id;
414
415 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
416 if (!p)
417 return -ENOMEM;
418
419 strcpy(p->alg_name, algo->name);
420 x->aead = p;
421 x->geniv = algo->uinfo.aead.geniv;
422 return 0;
423 }
424
xfrm_replay_verify_len(struct xfrm_replay_state_esn * replay_esn,struct nlattr * rp)425 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
426 struct nlattr *rp)
427 {
428 struct xfrm_replay_state_esn *up;
429 unsigned int ulen;
430
431 if (!replay_esn || !rp)
432 return 0;
433
434 up = nla_data(rp);
435 ulen = xfrm_replay_state_esn_len(up);
436
437 /* Check the overall length and the internal bitmap length to avoid
438 * potential overflow. */
439 if (nla_len(rp) < (int)ulen ||
440 xfrm_replay_state_esn_len(replay_esn) != ulen ||
441 replay_esn->bmp_len != up->bmp_len)
442 return -EINVAL;
443
444 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
445 return -EINVAL;
446
447 return 0;
448 }
449
xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn ** replay_esn,struct xfrm_replay_state_esn ** preplay_esn,struct nlattr * rta)450 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
451 struct xfrm_replay_state_esn **preplay_esn,
452 struct nlattr *rta)
453 {
454 struct xfrm_replay_state_esn *p, *pp, *up;
455 unsigned int klen, ulen;
456
457 if (!rta)
458 return 0;
459
460 up = nla_data(rta);
461 klen = xfrm_replay_state_esn_len(up);
462 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
463
464 p = kzalloc(klen, GFP_KERNEL);
465 if (!p)
466 return -ENOMEM;
467
468 pp = kzalloc(klen, GFP_KERNEL);
469 if (!pp) {
470 kfree(p);
471 return -ENOMEM;
472 }
473
474 memcpy(p, up, ulen);
475 memcpy(pp, up, ulen);
476
477 *replay_esn = p;
478 *preplay_esn = pp;
479
480 return 0;
481 }
482
xfrm_user_sec_ctx_size(struct xfrm_sec_ctx * xfrm_ctx)483 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
484 {
485 unsigned int len = 0;
486
487 if (xfrm_ctx) {
488 len += sizeof(struct xfrm_user_sec_ctx);
489 len += xfrm_ctx->ctx_len;
490 }
491 return len;
492 }
493
copy_from_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)494 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
495 {
496 memcpy(&x->id, &p->id, sizeof(x->id));
497 memcpy(&x->sel, &p->sel, sizeof(x->sel));
498 memcpy(&x->lft, &p->lft, sizeof(x->lft));
499 x->props.mode = p->mode;
500 x->props.replay_window = min_t(unsigned int, p->replay_window,
501 sizeof(x->replay.bitmap) * 8);
502 x->props.reqid = p->reqid;
503 x->props.family = p->family;
504 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
505 x->props.flags = p->flags;
506
507 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
508 x->sel.family = p->family;
509 }
510
511 /*
512 * someday when pfkey also has support, we could have the code
513 * somehow made shareable and move it to xfrm_state.c - JHS
514 *
515 */
xfrm_update_ae_params(struct xfrm_state * x,struct nlattr ** attrs,int update_esn)516 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
517 int update_esn)
518 {
519 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
520 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
521 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
522 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
523 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
524
525 if (re) {
526 struct xfrm_replay_state_esn *replay_esn;
527 replay_esn = nla_data(re);
528 memcpy(x->replay_esn, replay_esn,
529 xfrm_replay_state_esn_len(replay_esn));
530 memcpy(x->preplay_esn, replay_esn,
531 xfrm_replay_state_esn_len(replay_esn));
532 }
533
534 if (rp) {
535 struct xfrm_replay_state *replay;
536 replay = nla_data(rp);
537 memcpy(&x->replay, replay, sizeof(*replay));
538 memcpy(&x->preplay, replay, sizeof(*replay));
539 }
540
541 if (lt) {
542 struct xfrm_lifetime_cur *ltime;
543 ltime = nla_data(lt);
544 x->curlft.bytes = ltime->bytes;
545 x->curlft.packets = ltime->packets;
546 x->curlft.add_time = ltime->add_time;
547 x->curlft.use_time = ltime->use_time;
548 }
549
550 if (et)
551 x->replay_maxage = nla_get_u32(et);
552
553 if (rt)
554 x->replay_maxdiff = nla_get_u32(rt);
555 }
556
xfrm_smark_init(struct nlattr ** attrs,struct xfrm_mark * m)557 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
558 {
559 if (attrs[XFRMA_SET_MARK]) {
560 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
561 if (attrs[XFRMA_SET_MARK_MASK])
562 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
563 else
564 m->m = 0xffffffff;
565 } else {
566 m->v = m->m = 0;
567 }
568 }
569
xfrm_state_construct(struct net * net,struct xfrm_usersa_info * p,struct nlattr ** attrs,int * errp)570 static struct xfrm_state *xfrm_state_construct(struct net *net,
571 struct xfrm_usersa_info *p,
572 struct nlattr **attrs,
573 int *errp)
574 {
575 struct xfrm_state *x = xfrm_state_alloc(net);
576 int err = -ENOMEM;
577
578 if (!x)
579 goto error_no_put;
580
581 copy_from_user_state(x, p);
582
583 if (attrs[XFRMA_ENCAP]) {
584 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
585 sizeof(*x->encap), GFP_KERNEL);
586 if (x->encap == NULL)
587 goto error;
588 }
589
590 if (attrs[XFRMA_COADDR]) {
591 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
592 sizeof(*x->coaddr), GFP_KERNEL);
593 if (x->coaddr == NULL)
594 goto error;
595 }
596
597 if (attrs[XFRMA_SA_EXTRA_FLAGS])
598 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
599
600 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
601 goto error;
602 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
603 attrs[XFRMA_ALG_AUTH_TRUNC])))
604 goto error;
605 if (!x->props.aalgo) {
606 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
607 attrs[XFRMA_ALG_AUTH])))
608 goto error;
609 }
610 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
611 goto error;
612 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
613 xfrm_calg_get_byname,
614 attrs[XFRMA_ALG_COMP])))
615 goto error;
616
617 if (attrs[XFRMA_TFCPAD])
618 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
619
620 xfrm_mark_get(attrs, &x->mark);
621
622 xfrm_smark_init(attrs, &x->props.smark);
623
624 if (attrs[XFRMA_IF_ID])
625 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
626
627 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
628 if (err)
629 goto error;
630
631 if (attrs[XFRMA_SEC_CTX]) {
632 err = security_xfrm_state_alloc(x,
633 nla_data(attrs[XFRMA_SEC_CTX]));
634 if (err)
635 goto error;
636 }
637
638 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
639 attrs[XFRMA_REPLAY_ESN_VAL])))
640 goto error;
641
642 x->km.seq = p->seq;
643 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
644 /* sysctl_xfrm_aevent_etime is in 100ms units */
645 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
646
647 if ((err = xfrm_init_replay(x)))
648 goto error;
649
650 /* override default values from above */
651 xfrm_update_ae_params(x, attrs, 0);
652
653 /* configure the hardware if offload is requested */
654 if (attrs[XFRMA_OFFLOAD_DEV]) {
655 err = xfrm_dev_state_add(net, x,
656 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
657 if (err)
658 goto error;
659 }
660
661 return x;
662
663 error:
664 x->km.state = XFRM_STATE_DEAD;
665 xfrm_state_put(x);
666 error_no_put:
667 *errp = err;
668 return NULL;
669 }
670
xfrm_add_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)671 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
672 struct nlattr **attrs)
673 {
674 struct net *net = sock_net(skb->sk);
675 struct xfrm_usersa_info *p = nlmsg_data(nlh);
676 struct xfrm_state *x;
677 int err;
678 struct km_event c;
679
680 err = verify_newsa_info(p, attrs);
681 if (err)
682 return err;
683
684 x = xfrm_state_construct(net, p, attrs, &err);
685 if (!x)
686 return err;
687
688 xfrm_state_hold(x);
689 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
690 err = xfrm_state_add(x);
691 else
692 err = xfrm_state_update(x);
693
694 xfrm_audit_state_add(x, err ? 0 : 1, true);
695
696 if (err < 0) {
697 x->km.state = XFRM_STATE_DEAD;
698 xfrm_dev_state_delete(x);
699 __xfrm_state_put(x);
700 goto out;
701 }
702
703 if (x->km.state == XFRM_STATE_VOID)
704 x->km.state = XFRM_STATE_VALID;
705
706 c.seq = nlh->nlmsg_seq;
707 c.portid = nlh->nlmsg_pid;
708 c.event = nlh->nlmsg_type;
709
710 km_state_notify(x, &c);
711 out:
712 xfrm_state_put(x);
713 return err;
714 }
715
xfrm_user_state_lookup(struct net * net,struct xfrm_usersa_id * p,struct nlattr ** attrs,int * errp)716 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
717 struct xfrm_usersa_id *p,
718 struct nlattr **attrs,
719 int *errp)
720 {
721 struct xfrm_state *x = NULL;
722 struct xfrm_mark m;
723 int err;
724 u32 mark = xfrm_mark_get(attrs, &m);
725
726 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
727 err = -ESRCH;
728 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
729 } else {
730 xfrm_address_t *saddr = NULL;
731
732 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
733 if (!saddr) {
734 err = -EINVAL;
735 goto out;
736 }
737
738 err = -ESRCH;
739 x = xfrm_state_lookup_byaddr(net, mark,
740 &p->daddr, saddr,
741 p->proto, p->family);
742 }
743
744 out:
745 if (!x && errp)
746 *errp = err;
747 return x;
748 }
749
xfrm_del_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)750 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
751 struct nlattr **attrs)
752 {
753 struct net *net = sock_net(skb->sk);
754 struct xfrm_state *x;
755 int err = -ESRCH;
756 struct km_event c;
757 struct xfrm_usersa_id *p = nlmsg_data(nlh);
758
759 x = xfrm_user_state_lookup(net, p, attrs, &err);
760 if (x == NULL)
761 return err;
762
763 if ((err = security_xfrm_state_delete(x)) != 0)
764 goto out;
765
766 if (xfrm_state_kern(x)) {
767 err = -EPERM;
768 goto out;
769 }
770
771 err = xfrm_state_delete(x);
772
773 if (err < 0)
774 goto out;
775
776 c.seq = nlh->nlmsg_seq;
777 c.portid = nlh->nlmsg_pid;
778 c.event = nlh->nlmsg_type;
779 km_state_notify(x, &c);
780
781 out:
782 xfrm_audit_state_delete(x, err ? 0 : 1, true);
783 xfrm_state_put(x);
784 return err;
785 }
786
copy_to_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)787 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
788 {
789 memset(p, 0, sizeof(*p));
790 memcpy(&p->id, &x->id, sizeof(p->id));
791 memcpy(&p->sel, &x->sel, sizeof(p->sel));
792 memcpy(&p->lft, &x->lft, sizeof(p->lft));
793 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
794 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
795 put_unaligned(x->stats.replay, &p->stats.replay);
796 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
797 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
798 p->mode = x->props.mode;
799 p->replay_window = x->props.replay_window;
800 p->reqid = x->props.reqid;
801 p->family = x->props.family;
802 p->flags = x->props.flags;
803 p->seq = x->km.seq;
804 }
805
806 struct xfrm_dump_info {
807 struct sk_buff *in_skb;
808 struct sk_buff *out_skb;
809 u32 nlmsg_seq;
810 u16 nlmsg_flags;
811 };
812
copy_sec_ctx(struct xfrm_sec_ctx * s,struct sk_buff * skb)813 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
814 {
815 struct xfrm_user_sec_ctx *uctx;
816 struct nlattr *attr;
817 int ctx_size = sizeof(*uctx) + s->ctx_len;
818
819 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
820 if (attr == NULL)
821 return -EMSGSIZE;
822
823 uctx = nla_data(attr);
824 uctx->exttype = XFRMA_SEC_CTX;
825 uctx->len = ctx_size;
826 uctx->ctx_doi = s->ctx_doi;
827 uctx->ctx_alg = s->ctx_alg;
828 uctx->ctx_len = s->ctx_len;
829 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
830
831 return 0;
832 }
833
copy_user_offload(struct xfrm_state_offload * xso,struct sk_buff * skb)834 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
835 {
836 struct xfrm_user_offload *xuo;
837 struct nlattr *attr;
838
839 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
840 if (attr == NULL)
841 return -EMSGSIZE;
842
843 xuo = nla_data(attr);
844 memset(xuo, 0, sizeof(*xuo));
845 xuo->ifindex = xso->dev->ifindex;
846 xuo->flags = xso->flags;
847
848 return 0;
849 }
850
xfrm_redact(void)851 static bool xfrm_redact(void)
852 {
853 return IS_ENABLED(CONFIG_SECURITY) &&
854 security_locked_down(LOCKDOWN_XFRM_SECRET);
855 }
856
copy_to_user_auth(struct xfrm_algo_auth * auth,struct sk_buff * skb)857 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
858 {
859 struct xfrm_algo *algo;
860 struct xfrm_algo_auth *ap;
861 struct nlattr *nla;
862 bool redact_secret = xfrm_redact();
863
864 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
865 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
866 if (!nla)
867 return -EMSGSIZE;
868 algo = nla_data(nla);
869 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
870
871 if (redact_secret && auth->alg_key_len)
872 memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8);
873 else
874 memcpy(algo->alg_key, auth->alg_key,
875 (auth->alg_key_len + 7) / 8);
876 algo->alg_key_len = auth->alg_key_len;
877
878 nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth));
879 if (!nla)
880 return -EMSGSIZE;
881 ap = nla_data(nla);
882 memcpy(ap, auth, sizeof(struct xfrm_algo_auth));
883 if (redact_secret && auth->alg_key_len)
884 memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8);
885 else
886 memcpy(ap->alg_key, auth->alg_key,
887 (auth->alg_key_len + 7) / 8);
888 return 0;
889 }
890
copy_to_user_aead(struct xfrm_algo_aead * aead,struct sk_buff * skb)891 static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb)
892 {
893 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead));
894 struct xfrm_algo_aead *ap;
895 bool redact_secret = xfrm_redact();
896
897 if (!nla)
898 return -EMSGSIZE;
899
900 ap = nla_data(nla);
901 memcpy(ap, aead, sizeof(*aead));
902
903 if (redact_secret && aead->alg_key_len)
904 memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8);
905 else
906 memcpy(ap->alg_key, aead->alg_key,
907 (aead->alg_key_len + 7) / 8);
908 return 0;
909 }
910
copy_to_user_ealg(struct xfrm_algo * ealg,struct sk_buff * skb)911 static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb)
912 {
913 struct xfrm_algo *ap;
914 bool redact_secret = xfrm_redact();
915 struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT,
916 xfrm_alg_len(ealg));
917 if (!nla)
918 return -EMSGSIZE;
919
920 ap = nla_data(nla);
921 memcpy(ap, ealg, sizeof(*ealg));
922
923 if (redact_secret && ealg->alg_key_len)
924 memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8);
925 else
926 memcpy(ap->alg_key, ealg->alg_key,
927 (ealg->alg_key_len + 7) / 8);
928
929 return 0;
930 }
931
xfrm_smark_put(struct sk_buff * skb,struct xfrm_mark * m)932 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
933 {
934 int ret = 0;
935
936 if (m->v | m->m) {
937 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
938 if (!ret)
939 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
940 }
941 return ret;
942 }
943
944 /* 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)945 static int copy_to_user_state_extra(struct xfrm_state *x,
946 struct xfrm_usersa_info *p,
947 struct sk_buff *skb)
948 {
949 int ret = 0;
950
951 copy_to_user_state(x, p);
952
953 if (x->props.extra_flags) {
954 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
955 x->props.extra_flags);
956 if (ret)
957 goto out;
958 }
959
960 if (x->coaddr) {
961 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
962 if (ret)
963 goto out;
964 }
965 if (x->lastused) {
966 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
967 XFRMA_PAD);
968 if (ret)
969 goto out;
970 }
971 if (x->aead) {
972 ret = copy_to_user_aead(x->aead, skb);
973 if (ret)
974 goto out;
975 }
976 if (x->aalg) {
977 ret = copy_to_user_auth(x->aalg, skb);
978 if (ret)
979 goto out;
980 }
981 if (x->ealg) {
982 ret = copy_to_user_ealg(x->ealg, skb);
983 if (ret)
984 goto out;
985 }
986 if (x->calg) {
987 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
988 if (ret)
989 goto out;
990 }
991 if (x->encap) {
992 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
993 if (ret)
994 goto out;
995 }
996 if (x->tfcpad) {
997 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
998 if (ret)
999 goto out;
1000 }
1001 ret = xfrm_mark_put(skb, &x->mark);
1002 if (ret)
1003 goto out;
1004
1005 ret = xfrm_smark_put(skb, &x->props.smark);
1006 if (ret)
1007 goto out;
1008
1009 if (x->replay_esn)
1010 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1011 xfrm_replay_state_esn_len(x->replay_esn),
1012 x->replay_esn);
1013 else
1014 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1015 &x->replay);
1016 if (ret)
1017 goto out;
1018 if(x->xso.dev)
1019 ret = copy_user_offload(&x->xso, skb);
1020 if (ret)
1021 goto out;
1022 if (x->if_id) {
1023 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
1024 if (ret)
1025 goto out;
1026 }
1027 if (x->security)
1028 ret = copy_sec_ctx(x->security, skb);
1029 out:
1030 return ret;
1031 }
1032
dump_one_state(struct xfrm_state * x,int count,void * ptr)1033 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
1034 {
1035 struct xfrm_dump_info *sp = ptr;
1036 struct sk_buff *in_skb = sp->in_skb;
1037 struct sk_buff *skb = sp->out_skb;
1038 struct xfrm_translator *xtr;
1039 struct xfrm_usersa_info *p;
1040 struct nlmsghdr *nlh;
1041 int err;
1042
1043 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1044 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
1045 if (nlh == NULL)
1046 return -EMSGSIZE;
1047
1048 p = nlmsg_data(nlh);
1049
1050 err = copy_to_user_state_extra(x, p, skb);
1051 if (err) {
1052 nlmsg_cancel(skb, nlh);
1053 return err;
1054 }
1055 nlmsg_end(skb, nlh);
1056
1057 xtr = xfrm_get_translator();
1058 if (xtr) {
1059 err = xtr->alloc_compat(skb, nlh);
1060
1061 xfrm_put_translator(xtr);
1062 if (err) {
1063 nlmsg_cancel(skb, nlh);
1064 return err;
1065 }
1066 }
1067
1068 return 0;
1069 }
1070
xfrm_dump_sa_done(struct netlink_callback * cb)1071 static int xfrm_dump_sa_done(struct netlink_callback *cb)
1072 {
1073 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1074 struct sock *sk = cb->skb->sk;
1075 struct net *net = sock_net(sk);
1076
1077 if (cb->args[0])
1078 xfrm_state_walk_done(walk, net);
1079 return 0;
1080 }
1081
xfrm_dump_sa(struct sk_buff * skb,struct netlink_callback * cb)1082 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1083 {
1084 struct net *net = sock_net(skb->sk);
1085 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1086 struct xfrm_dump_info info;
1087
1088 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1089 sizeof(cb->args) - sizeof(cb->args[0]));
1090
1091 info.in_skb = cb->skb;
1092 info.out_skb = skb;
1093 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1094 info.nlmsg_flags = NLM_F_MULTI;
1095
1096 if (!cb->args[0]) {
1097 struct nlattr *attrs[XFRMA_MAX+1];
1098 struct xfrm_address_filter *filter = NULL;
1099 u8 proto = 0;
1100 int err;
1101
1102 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1103 xfrma_policy, cb->extack);
1104 if (err < 0)
1105 return err;
1106
1107 if (attrs[XFRMA_ADDRESS_FILTER]) {
1108 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1109 sizeof(*filter), GFP_KERNEL);
1110 if (filter == NULL)
1111 return -ENOMEM;
1112 }
1113
1114 if (attrs[XFRMA_PROTO])
1115 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1116
1117 xfrm_state_walk_init(walk, proto, filter);
1118 cb->args[0] = 1;
1119 }
1120
1121 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1122
1123 return skb->len;
1124 }
1125
xfrm_state_netlink(struct sk_buff * in_skb,struct xfrm_state * x,u32 seq)1126 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1127 struct xfrm_state *x, u32 seq)
1128 {
1129 struct xfrm_dump_info info;
1130 struct sk_buff *skb;
1131 int err;
1132
1133 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1134 if (!skb)
1135 return ERR_PTR(-ENOMEM);
1136
1137 info.in_skb = in_skb;
1138 info.out_skb = skb;
1139 info.nlmsg_seq = seq;
1140 info.nlmsg_flags = 0;
1141
1142 err = dump_one_state(x, 0, &info);
1143 if (err) {
1144 kfree_skb(skb);
1145 return ERR_PTR(err);
1146 }
1147
1148 return skb;
1149 }
1150
1151 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1152 * Must be called with RCU read lock.
1153 */
xfrm_nlmsg_multicast(struct net * net,struct sk_buff * skb,u32 pid,unsigned int group)1154 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1155 u32 pid, unsigned int group)
1156 {
1157 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1158 struct xfrm_translator *xtr;
1159
1160 if (!nlsk) {
1161 kfree_skb(skb);
1162 return -EPIPE;
1163 }
1164
1165 xtr = xfrm_get_translator();
1166 if (xtr) {
1167 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1168
1169 xfrm_put_translator(xtr);
1170 if (err) {
1171 kfree_skb(skb);
1172 return err;
1173 }
1174 }
1175
1176 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1177 }
1178
xfrm_spdinfo_msgsize(void)1179 static inline unsigned int xfrm_spdinfo_msgsize(void)
1180 {
1181 return NLMSG_ALIGN(4)
1182 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1183 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1184 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1185 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1186 }
1187
build_spdinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1188 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1189 u32 portid, u32 seq, u32 flags)
1190 {
1191 struct xfrmk_spdinfo si;
1192 struct xfrmu_spdinfo spc;
1193 struct xfrmu_spdhinfo sph;
1194 struct xfrmu_spdhthresh spt4, spt6;
1195 struct nlmsghdr *nlh;
1196 int err;
1197 u32 *f;
1198 unsigned lseq;
1199
1200 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1201 if (nlh == NULL) /* shouldn't really happen ... */
1202 return -EMSGSIZE;
1203
1204 f = nlmsg_data(nlh);
1205 *f = flags;
1206 xfrm_spd_getinfo(net, &si);
1207 spc.incnt = si.incnt;
1208 spc.outcnt = si.outcnt;
1209 spc.fwdcnt = si.fwdcnt;
1210 spc.inscnt = si.inscnt;
1211 spc.outscnt = si.outscnt;
1212 spc.fwdscnt = si.fwdscnt;
1213 sph.spdhcnt = si.spdhcnt;
1214 sph.spdhmcnt = si.spdhmcnt;
1215
1216 do {
1217 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1218
1219 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1220 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1221 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1222 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1223 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1224
1225 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1226 if (!err)
1227 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1228 if (!err)
1229 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1230 if (!err)
1231 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1232 if (err) {
1233 nlmsg_cancel(skb, nlh);
1234 return err;
1235 }
1236
1237 nlmsg_end(skb, nlh);
1238 return 0;
1239 }
1240
xfrm_set_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1241 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1242 struct nlattr **attrs)
1243 {
1244 struct net *net = sock_net(skb->sk);
1245 struct xfrmu_spdhthresh *thresh4 = NULL;
1246 struct xfrmu_spdhthresh *thresh6 = NULL;
1247
1248 /* selector prefixlen thresholds to hash policies */
1249 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1250 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1251
1252 if (nla_len(rta) < sizeof(*thresh4))
1253 return -EINVAL;
1254 thresh4 = nla_data(rta);
1255 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1256 return -EINVAL;
1257 }
1258 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1259 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1260
1261 if (nla_len(rta) < sizeof(*thresh6))
1262 return -EINVAL;
1263 thresh6 = nla_data(rta);
1264 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1265 return -EINVAL;
1266 }
1267
1268 if (thresh4 || thresh6) {
1269 write_seqlock(&net->xfrm.policy_hthresh.lock);
1270 if (thresh4) {
1271 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1272 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1273 }
1274 if (thresh6) {
1275 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1276 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1277 }
1278 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1279
1280 xfrm_policy_hash_rebuild(net);
1281 }
1282
1283 return 0;
1284 }
1285
xfrm_get_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1286 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1287 struct nlattr **attrs)
1288 {
1289 struct net *net = sock_net(skb->sk);
1290 struct sk_buff *r_skb;
1291 u32 *flags = nlmsg_data(nlh);
1292 u32 sportid = NETLINK_CB(skb).portid;
1293 u32 seq = nlh->nlmsg_seq;
1294 int err;
1295
1296 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1297 if (r_skb == NULL)
1298 return -ENOMEM;
1299
1300 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1301 BUG_ON(err < 0);
1302
1303 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1304 }
1305
xfrm_sadinfo_msgsize(void)1306 static inline unsigned int xfrm_sadinfo_msgsize(void)
1307 {
1308 return NLMSG_ALIGN(4)
1309 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1310 + nla_total_size(4); /* XFRMA_SAD_CNT */
1311 }
1312
build_sadinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1313 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1314 u32 portid, u32 seq, u32 flags)
1315 {
1316 struct xfrmk_sadinfo si;
1317 struct xfrmu_sadhinfo sh;
1318 struct nlmsghdr *nlh;
1319 int err;
1320 u32 *f;
1321
1322 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1323 if (nlh == NULL) /* shouldn't really happen ... */
1324 return -EMSGSIZE;
1325
1326 f = nlmsg_data(nlh);
1327 *f = flags;
1328 xfrm_sad_getinfo(net, &si);
1329
1330 sh.sadhmcnt = si.sadhmcnt;
1331 sh.sadhcnt = si.sadhcnt;
1332
1333 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1334 if (!err)
1335 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1336 if (err) {
1337 nlmsg_cancel(skb, nlh);
1338 return err;
1339 }
1340
1341 nlmsg_end(skb, nlh);
1342 return 0;
1343 }
1344
xfrm_get_sadinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1345 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1346 struct nlattr **attrs)
1347 {
1348 struct net *net = sock_net(skb->sk);
1349 struct sk_buff *r_skb;
1350 u32 *flags = nlmsg_data(nlh);
1351 u32 sportid = NETLINK_CB(skb).portid;
1352 u32 seq = nlh->nlmsg_seq;
1353 int err;
1354
1355 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1356 if (r_skb == NULL)
1357 return -ENOMEM;
1358
1359 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1360 BUG_ON(err < 0);
1361
1362 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1363 }
1364
xfrm_get_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1365 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1366 struct nlattr **attrs)
1367 {
1368 struct net *net = sock_net(skb->sk);
1369 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1370 struct xfrm_state *x;
1371 struct sk_buff *resp_skb;
1372 int err = -ESRCH;
1373
1374 x = xfrm_user_state_lookup(net, p, attrs, &err);
1375 if (x == NULL)
1376 goto out_noput;
1377
1378 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1379 if (IS_ERR(resp_skb)) {
1380 err = PTR_ERR(resp_skb);
1381 } else {
1382 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1383 }
1384 xfrm_state_put(x);
1385 out_noput:
1386 return err;
1387 }
1388
xfrm_alloc_userspi(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1389 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1390 struct nlattr **attrs)
1391 {
1392 struct net *net = sock_net(skb->sk);
1393 struct xfrm_state *x;
1394 struct xfrm_userspi_info *p;
1395 struct xfrm_translator *xtr;
1396 struct sk_buff *resp_skb;
1397 xfrm_address_t *daddr;
1398 int family;
1399 int err;
1400 u32 mark;
1401 struct xfrm_mark m;
1402 u32 if_id = 0;
1403
1404 p = nlmsg_data(nlh);
1405 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1406 if (err)
1407 goto out_noput;
1408
1409 family = p->info.family;
1410 daddr = &p->info.id.daddr;
1411
1412 x = NULL;
1413
1414 mark = xfrm_mark_get(attrs, &m);
1415
1416 if (attrs[XFRMA_IF_ID])
1417 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1418
1419 if (p->info.seq) {
1420 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1421 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1422 xfrm_state_put(x);
1423 x = NULL;
1424 }
1425 }
1426
1427 if (!x)
1428 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1429 if_id, p->info.id.proto, daddr,
1430 &p->info.saddr, 1,
1431 family);
1432 err = -ENOENT;
1433 if (x == NULL)
1434 goto out_noput;
1435
1436 err = xfrm_alloc_spi(x, p->min, p->max);
1437 if (err)
1438 goto out;
1439
1440 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1441 if (IS_ERR(resp_skb)) {
1442 err = PTR_ERR(resp_skb);
1443 goto out;
1444 }
1445
1446 xtr = xfrm_get_translator();
1447 if (xtr) {
1448 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1449
1450 xfrm_put_translator(xtr);
1451 if (err) {
1452 kfree_skb(resp_skb);
1453 goto out;
1454 }
1455 }
1456
1457 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1458
1459 out:
1460 xfrm_state_put(x);
1461 out_noput:
1462 return err;
1463 }
1464
verify_policy_dir(u8 dir)1465 static int verify_policy_dir(u8 dir)
1466 {
1467 switch (dir) {
1468 case XFRM_POLICY_IN:
1469 case XFRM_POLICY_OUT:
1470 case XFRM_POLICY_FWD:
1471 break;
1472
1473 default:
1474 return -EINVAL;
1475 }
1476
1477 return 0;
1478 }
1479
verify_policy_type(u8 type)1480 static int verify_policy_type(u8 type)
1481 {
1482 switch (type) {
1483 case XFRM_POLICY_TYPE_MAIN:
1484 #ifdef CONFIG_XFRM_SUB_POLICY
1485 case XFRM_POLICY_TYPE_SUB:
1486 #endif
1487 break;
1488
1489 default:
1490 return -EINVAL;
1491 }
1492
1493 return 0;
1494 }
1495
verify_newpolicy_info(struct xfrm_userpolicy_info * p)1496 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1497 {
1498 int ret;
1499
1500 switch (p->share) {
1501 case XFRM_SHARE_ANY:
1502 case XFRM_SHARE_SESSION:
1503 case XFRM_SHARE_USER:
1504 case XFRM_SHARE_UNIQUE:
1505 break;
1506
1507 default:
1508 return -EINVAL;
1509 }
1510
1511 switch (p->action) {
1512 case XFRM_POLICY_ALLOW:
1513 case XFRM_POLICY_BLOCK:
1514 break;
1515
1516 default:
1517 return -EINVAL;
1518 }
1519
1520 switch (p->sel.family) {
1521 case AF_INET:
1522 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1523 return -EINVAL;
1524
1525 break;
1526
1527 case AF_INET6:
1528 #if IS_ENABLED(CONFIG_IPV6)
1529 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1530 return -EINVAL;
1531
1532 break;
1533 #else
1534 return -EAFNOSUPPORT;
1535 #endif
1536
1537 default:
1538 return -EINVAL;
1539 }
1540
1541 ret = verify_policy_dir(p->dir);
1542 if (ret)
1543 return ret;
1544 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1545 return -EINVAL;
1546
1547 return 0;
1548 }
1549
copy_from_user_sec_ctx(struct xfrm_policy * pol,struct nlattr ** attrs)1550 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1551 {
1552 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1553 struct xfrm_user_sec_ctx *uctx;
1554
1555 if (!rt)
1556 return 0;
1557
1558 uctx = nla_data(rt);
1559 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1560 }
1561
copy_templates(struct xfrm_policy * xp,struct xfrm_user_tmpl * ut,int nr)1562 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1563 int nr)
1564 {
1565 int i;
1566
1567 xp->xfrm_nr = nr;
1568 for (i = 0; i < nr; i++, ut++) {
1569 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1570
1571 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1572 memcpy(&t->saddr, &ut->saddr,
1573 sizeof(xfrm_address_t));
1574 t->reqid = ut->reqid;
1575 t->mode = ut->mode;
1576 t->share = ut->share;
1577 t->optional = ut->optional;
1578 t->aalgos = ut->aalgos;
1579 t->ealgos = ut->ealgos;
1580 t->calgos = ut->calgos;
1581 /* If all masks are ~0, then we allow all algorithms. */
1582 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1583 t->encap_family = ut->family;
1584 }
1585 }
1586
validate_tmpl(int nr,struct xfrm_user_tmpl * ut,u16 family)1587 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1588 {
1589 u16 prev_family;
1590 int i;
1591
1592 if (nr > XFRM_MAX_DEPTH)
1593 return -EINVAL;
1594
1595 prev_family = family;
1596
1597 for (i = 0; i < nr; i++) {
1598 /* We never validated the ut->family value, so many
1599 * applications simply leave it at zero. The check was
1600 * never made and ut->family was ignored because all
1601 * templates could be assumed to have the same family as
1602 * the policy itself. Now that we will have ipv4-in-ipv6
1603 * and ipv6-in-ipv4 tunnels, this is no longer true.
1604 */
1605 if (!ut[i].family)
1606 ut[i].family = family;
1607
1608 switch (ut[i].mode) {
1609 case XFRM_MODE_TUNNEL:
1610 case XFRM_MODE_BEET:
1611 break;
1612 default:
1613 if (ut[i].family != prev_family)
1614 return -EINVAL;
1615 break;
1616 }
1617 if (ut[i].mode >= XFRM_MODE_MAX)
1618 return -EINVAL;
1619
1620 prev_family = ut[i].family;
1621
1622 switch (ut[i].family) {
1623 case AF_INET:
1624 break;
1625 #if IS_ENABLED(CONFIG_IPV6)
1626 case AF_INET6:
1627 break;
1628 #endif
1629 default:
1630 return -EINVAL;
1631 }
1632
1633 if (!xfrm_id_proto_valid(ut[i].id.proto))
1634 return -EINVAL;
1635 }
1636
1637 return 0;
1638 }
1639
copy_from_user_tmpl(struct xfrm_policy * pol,struct nlattr ** attrs)1640 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1641 {
1642 struct nlattr *rt = attrs[XFRMA_TMPL];
1643
1644 if (!rt) {
1645 pol->xfrm_nr = 0;
1646 } else {
1647 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1648 int nr = nla_len(rt) / sizeof(*utmpl);
1649 int err;
1650
1651 err = validate_tmpl(nr, utmpl, pol->family);
1652 if (err)
1653 return err;
1654
1655 copy_templates(pol, utmpl, nr);
1656 }
1657 return 0;
1658 }
1659
copy_from_user_policy_type(u8 * tp,struct nlattr ** attrs)1660 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1661 {
1662 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1663 struct xfrm_userpolicy_type *upt;
1664 u8 type = XFRM_POLICY_TYPE_MAIN;
1665 int err;
1666
1667 if (rt) {
1668 upt = nla_data(rt);
1669 type = upt->type;
1670 }
1671
1672 err = verify_policy_type(type);
1673 if (err)
1674 return err;
1675
1676 *tp = type;
1677 return 0;
1678 }
1679
copy_from_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p)1680 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1681 {
1682 xp->priority = p->priority;
1683 xp->index = p->index;
1684 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1685 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1686 xp->action = p->action;
1687 xp->flags = p->flags;
1688 xp->family = p->sel.family;
1689 /* XXX xp->share = p->share; */
1690 }
1691
copy_to_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p,int dir)1692 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1693 {
1694 memset(p, 0, sizeof(*p));
1695 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1696 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1697 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1698 p->priority = xp->priority;
1699 p->index = xp->index;
1700 p->sel.family = xp->family;
1701 p->dir = dir;
1702 p->action = xp->action;
1703 p->flags = xp->flags;
1704 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1705 }
1706
xfrm_policy_construct(struct net * net,struct xfrm_userpolicy_info * p,struct nlattr ** attrs,int * errp)1707 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1708 {
1709 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1710 int err;
1711
1712 if (!xp) {
1713 *errp = -ENOMEM;
1714 return NULL;
1715 }
1716
1717 copy_from_user_policy(xp, p);
1718
1719 err = copy_from_user_policy_type(&xp->type, attrs);
1720 if (err)
1721 goto error;
1722
1723 if (!(err = copy_from_user_tmpl(xp, attrs)))
1724 err = copy_from_user_sec_ctx(xp, attrs);
1725 if (err)
1726 goto error;
1727
1728 xfrm_mark_get(attrs, &xp->mark);
1729
1730 if (attrs[XFRMA_IF_ID])
1731 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1732
1733 return xp;
1734 error:
1735 *errp = err;
1736 xp->walk.dead = 1;
1737 xfrm_policy_destroy(xp);
1738 return NULL;
1739 }
1740
xfrm_add_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1741 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1742 struct nlattr **attrs)
1743 {
1744 struct net *net = sock_net(skb->sk);
1745 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1746 struct xfrm_policy *xp;
1747 struct km_event c;
1748 int err;
1749 int excl;
1750
1751 err = verify_newpolicy_info(p);
1752 if (err)
1753 return err;
1754 err = verify_sec_ctx_len(attrs);
1755 if (err)
1756 return err;
1757
1758 xp = xfrm_policy_construct(net, p, attrs, &err);
1759 if (!xp)
1760 return err;
1761
1762 /* shouldn't excl be based on nlh flags??
1763 * Aha! this is anti-netlink really i.e more pfkey derived
1764 * in netlink excl is a flag and you wouldn't need
1765 * a type XFRM_MSG_UPDPOLICY - JHS */
1766 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1767 err = xfrm_policy_insert(p->dir, xp, excl);
1768 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1769
1770 if (err) {
1771 security_xfrm_policy_free(xp->security);
1772 kfree(xp);
1773 return err;
1774 }
1775
1776 c.event = nlh->nlmsg_type;
1777 c.seq = nlh->nlmsg_seq;
1778 c.portid = nlh->nlmsg_pid;
1779 km_policy_notify(xp, p->dir, &c);
1780
1781 xfrm_pol_put(xp);
1782
1783 return 0;
1784 }
1785
copy_to_user_tmpl(struct xfrm_policy * xp,struct sk_buff * skb)1786 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1787 {
1788 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1789 int i;
1790
1791 if (xp->xfrm_nr == 0)
1792 return 0;
1793
1794 for (i = 0; i < xp->xfrm_nr; i++) {
1795 struct xfrm_user_tmpl *up = &vec[i];
1796 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1797
1798 memset(up, 0, sizeof(*up));
1799 memcpy(&up->id, &kp->id, sizeof(up->id));
1800 up->family = kp->encap_family;
1801 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1802 up->reqid = kp->reqid;
1803 up->mode = kp->mode;
1804 up->share = kp->share;
1805 up->optional = kp->optional;
1806 up->aalgos = kp->aalgos;
1807 up->ealgos = kp->ealgos;
1808 up->calgos = kp->calgos;
1809 }
1810
1811 return nla_put(skb, XFRMA_TMPL,
1812 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1813 }
1814
copy_to_user_state_sec_ctx(struct xfrm_state * x,struct sk_buff * skb)1815 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1816 {
1817 if (x->security) {
1818 return copy_sec_ctx(x->security, skb);
1819 }
1820 return 0;
1821 }
1822
copy_to_user_sec_ctx(struct xfrm_policy * xp,struct sk_buff * skb)1823 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1824 {
1825 if (xp->security)
1826 return copy_sec_ctx(xp->security, skb);
1827 return 0;
1828 }
userpolicy_type_attrsize(void)1829 static inline unsigned int userpolicy_type_attrsize(void)
1830 {
1831 #ifdef CONFIG_XFRM_SUB_POLICY
1832 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1833 #else
1834 return 0;
1835 #endif
1836 }
1837
1838 #ifdef CONFIG_XFRM_SUB_POLICY
copy_to_user_policy_type(u8 type,struct sk_buff * skb)1839 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1840 {
1841 struct xfrm_userpolicy_type upt;
1842
1843 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1844 memset(&upt, 0, sizeof(upt));
1845 upt.type = type;
1846
1847 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1848 }
1849
1850 #else
copy_to_user_policy_type(u8 type,struct sk_buff * skb)1851 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1852 {
1853 return 0;
1854 }
1855 #endif
1856
dump_one_policy(struct xfrm_policy * xp,int dir,int count,void * ptr)1857 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1858 {
1859 struct xfrm_dump_info *sp = ptr;
1860 struct xfrm_userpolicy_info *p;
1861 struct sk_buff *in_skb = sp->in_skb;
1862 struct sk_buff *skb = sp->out_skb;
1863 struct xfrm_translator *xtr;
1864 struct nlmsghdr *nlh;
1865 int err;
1866
1867 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1868 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1869 if (nlh == NULL)
1870 return -EMSGSIZE;
1871
1872 p = nlmsg_data(nlh);
1873 copy_to_user_policy(xp, p, dir);
1874 err = copy_to_user_tmpl(xp, skb);
1875 if (!err)
1876 err = copy_to_user_sec_ctx(xp, skb);
1877 if (!err)
1878 err = copy_to_user_policy_type(xp->type, skb);
1879 if (!err)
1880 err = xfrm_mark_put(skb, &xp->mark);
1881 if (!err)
1882 err = xfrm_if_id_put(skb, xp->if_id);
1883 if (err) {
1884 nlmsg_cancel(skb, nlh);
1885 return err;
1886 }
1887 nlmsg_end(skb, nlh);
1888
1889 xtr = xfrm_get_translator();
1890 if (xtr) {
1891 err = xtr->alloc_compat(skb, nlh);
1892
1893 xfrm_put_translator(xtr);
1894 if (err) {
1895 nlmsg_cancel(skb, nlh);
1896 return err;
1897 }
1898 }
1899
1900 return 0;
1901 }
1902
xfrm_dump_policy_done(struct netlink_callback * cb)1903 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1904 {
1905 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1906 struct net *net = sock_net(cb->skb->sk);
1907
1908 xfrm_policy_walk_done(walk, net);
1909 return 0;
1910 }
1911
xfrm_dump_policy_start(struct netlink_callback * cb)1912 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1913 {
1914 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1915
1916 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1917
1918 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1919 return 0;
1920 }
1921
xfrm_dump_policy(struct sk_buff * skb,struct netlink_callback * cb)1922 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1923 {
1924 struct net *net = sock_net(skb->sk);
1925 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1926 struct xfrm_dump_info info;
1927
1928 info.in_skb = cb->skb;
1929 info.out_skb = skb;
1930 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1931 info.nlmsg_flags = NLM_F_MULTI;
1932
1933 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1934
1935 return skb->len;
1936 }
1937
xfrm_policy_netlink(struct sk_buff * in_skb,struct xfrm_policy * xp,int dir,u32 seq)1938 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1939 struct xfrm_policy *xp,
1940 int dir, u32 seq)
1941 {
1942 struct xfrm_dump_info info;
1943 struct sk_buff *skb;
1944 int err;
1945
1946 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1947 if (!skb)
1948 return ERR_PTR(-ENOMEM);
1949
1950 info.in_skb = in_skb;
1951 info.out_skb = skb;
1952 info.nlmsg_seq = seq;
1953 info.nlmsg_flags = 0;
1954
1955 err = dump_one_policy(xp, dir, 0, &info);
1956 if (err) {
1957 kfree_skb(skb);
1958 return ERR_PTR(err);
1959 }
1960
1961 return skb;
1962 }
1963
xfrm_notify_userpolicy(struct net * net)1964 static int xfrm_notify_userpolicy(struct net *net)
1965 {
1966 struct xfrm_userpolicy_default *up;
1967 int len = NLMSG_ALIGN(sizeof(*up));
1968 struct nlmsghdr *nlh;
1969 struct sk_buff *skb;
1970 int err;
1971
1972 skb = nlmsg_new(len, GFP_ATOMIC);
1973 if (skb == NULL)
1974 return -ENOMEM;
1975
1976 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0);
1977 if (nlh == NULL) {
1978 kfree_skb(skb);
1979 return -EMSGSIZE;
1980 }
1981
1982 up = nlmsg_data(nlh);
1983 up->in = net->xfrm.policy_default & XFRM_POL_DEFAULT_IN ?
1984 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT;
1985 up->fwd = net->xfrm.policy_default & XFRM_POL_DEFAULT_FWD ?
1986 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT;
1987 up->out = net->xfrm.policy_default & XFRM_POL_DEFAULT_OUT ?
1988 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT;
1989
1990 nlmsg_end(skb, nlh);
1991
1992 rcu_read_lock();
1993 err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
1994 rcu_read_unlock();
1995
1996 return err;
1997 }
1998
xfrm_set_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1999 static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2000 struct nlattr **attrs)
2001 {
2002 struct net *net = sock_net(skb->sk);
2003 struct xfrm_userpolicy_default *up = nlmsg_data(nlh);
2004
2005 if (up->in == XFRM_USERPOLICY_BLOCK)
2006 net->xfrm.policy_default |= XFRM_POL_DEFAULT_IN;
2007 else if (up->in == XFRM_USERPOLICY_ACCEPT)
2008 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_IN;
2009
2010 if (up->fwd == XFRM_USERPOLICY_BLOCK)
2011 net->xfrm.policy_default |= XFRM_POL_DEFAULT_FWD;
2012 else if (up->fwd == XFRM_USERPOLICY_ACCEPT)
2013 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_FWD;
2014
2015 if (up->out == XFRM_USERPOLICY_BLOCK)
2016 net->xfrm.policy_default |= XFRM_POL_DEFAULT_OUT;
2017 else if (up->out == XFRM_USERPOLICY_ACCEPT)
2018 net->xfrm.policy_default &= ~XFRM_POL_DEFAULT_OUT;
2019
2020 rt_genid_bump_all(net);
2021
2022 xfrm_notify_userpolicy(net);
2023 return 0;
2024 }
2025
xfrm_get_default(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2026 static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh,
2027 struct nlattr **attrs)
2028 {
2029 struct sk_buff *r_skb;
2030 struct nlmsghdr *r_nlh;
2031 struct net *net = sock_net(skb->sk);
2032 struct xfrm_userpolicy_default *r_up;
2033 int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default));
2034 u32 portid = NETLINK_CB(skb).portid;
2035 u32 seq = nlh->nlmsg_seq;
2036
2037 r_skb = nlmsg_new(len, GFP_ATOMIC);
2038 if (!r_skb)
2039 return -ENOMEM;
2040
2041 r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0);
2042 if (!r_nlh) {
2043 kfree_skb(r_skb);
2044 return -EMSGSIZE;
2045 }
2046
2047 r_up = nlmsg_data(r_nlh);
2048
2049 r_up->in = net->xfrm.policy_default & XFRM_POL_DEFAULT_IN ?
2050 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT;
2051 r_up->fwd = net->xfrm.policy_default & XFRM_POL_DEFAULT_FWD ?
2052 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT;
2053 r_up->out = net->xfrm.policy_default & XFRM_POL_DEFAULT_OUT ?
2054 XFRM_USERPOLICY_BLOCK : XFRM_USERPOLICY_ACCEPT;
2055 nlmsg_end(r_skb, r_nlh);
2056
2057 return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid);
2058 }
2059
xfrm_get_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2060 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2061 struct nlattr **attrs)
2062 {
2063 struct net *net = sock_net(skb->sk);
2064 struct xfrm_policy *xp;
2065 struct xfrm_userpolicy_id *p;
2066 u8 type = XFRM_POLICY_TYPE_MAIN;
2067 int err;
2068 struct km_event c;
2069 int delete;
2070 struct xfrm_mark m;
2071 u32 if_id = 0;
2072
2073 p = nlmsg_data(nlh);
2074 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
2075
2076 err = copy_from_user_policy_type(&type, attrs);
2077 if (err)
2078 return err;
2079
2080 err = verify_policy_dir(p->dir);
2081 if (err)
2082 return err;
2083
2084 if (attrs[XFRMA_IF_ID])
2085 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2086
2087 xfrm_mark_get(attrs, &m);
2088
2089 if (p->index)
2090 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
2091 p->index, delete, &err);
2092 else {
2093 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2094 struct xfrm_sec_ctx *ctx;
2095
2096 err = verify_sec_ctx_len(attrs);
2097 if (err)
2098 return err;
2099
2100 ctx = NULL;
2101 if (rt) {
2102 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2103
2104 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2105 if (err)
2106 return err;
2107 }
2108 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2109 &p->sel, ctx, delete, &err);
2110 security_xfrm_policy_free(ctx);
2111 }
2112 if (xp == NULL)
2113 return -ENOENT;
2114
2115 if (!delete) {
2116 struct sk_buff *resp_skb;
2117
2118 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
2119 if (IS_ERR(resp_skb)) {
2120 err = PTR_ERR(resp_skb);
2121 } else {
2122 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
2123 NETLINK_CB(skb).portid);
2124 }
2125 } else {
2126 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2127
2128 if (err != 0)
2129 goto out;
2130
2131 c.data.byid = p->index;
2132 c.event = nlh->nlmsg_type;
2133 c.seq = nlh->nlmsg_seq;
2134 c.portid = nlh->nlmsg_pid;
2135 km_policy_notify(xp, p->dir, &c);
2136 }
2137
2138 out:
2139 xfrm_pol_put(xp);
2140 return err;
2141 }
2142
xfrm_flush_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2143 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2144 struct nlattr **attrs)
2145 {
2146 struct net *net = sock_net(skb->sk);
2147 struct km_event c;
2148 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2149 int err;
2150
2151 err = xfrm_state_flush(net, p->proto, true, false);
2152 if (err) {
2153 if (err == -ESRCH) /* empty table */
2154 return 0;
2155 return err;
2156 }
2157 c.data.proto = p->proto;
2158 c.event = nlh->nlmsg_type;
2159 c.seq = nlh->nlmsg_seq;
2160 c.portid = nlh->nlmsg_pid;
2161 c.net = net;
2162 km_state_notify(NULL, &c);
2163
2164 return 0;
2165 }
2166
xfrm_aevent_msgsize(struct xfrm_state * x)2167 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2168 {
2169 unsigned int replay_size = x->replay_esn ?
2170 xfrm_replay_state_esn_len(x->replay_esn) :
2171 sizeof(struct xfrm_replay_state);
2172
2173 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2174 + nla_total_size(replay_size)
2175 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2176 + nla_total_size(sizeof(struct xfrm_mark))
2177 + nla_total_size(4) /* XFRM_AE_RTHR */
2178 + nla_total_size(4); /* XFRM_AE_ETHR */
2179 }
2180
build_aevent(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2181 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2182 {
2183 struct xfrm_aevent_id *id;
2184 struct nlmsghdr *nlh;
2185 int err;
2186
2187 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2188 if (nlh == NULL)
2189 return -EMSGSIZE;
2190
2191 id = nlmsg_data(nlh);
2192 memset(&id->sa_id, 0, sizeof(id->sa_id));
2193 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2194 id->sa_id.spi = x->id.spi;
2195 id->sa_id.family = x->props.family;
2196 id->sa_id.proto = x->id.proto;
2197 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2198 id->reqid = x->props.reqid;
2199 id->flags = c->data.aevent;
2200
2201 if (x->replay_esn) {
2202 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2203 xfrm_replay_state_esn_len(x->replay_esn),
2204 x->replay_esn);
2205 } else {
2206 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2207 &x->replay);
2208 }
2209 if (err)
2210 goto out_cancel;
2211 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2212 XFRMA_PAD);
2213 if (err)
2214 goto out_cancel;
2215
2216 if (id->flags & XFRM_AE_RTHR) {
2217 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2218 if (err)
2219 goto out_cancel;
2220 }
2221 if (id->flags & XFRM_AE_ETHR) {
2222 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2223 x->replay_maxage * 10 / HZ);
2224 if (err)
2225 goto out_cancel;
2226 }
2227 err = xfrm_mark_put(skb, &x->mark);
2228 if (err)
2229 goto out_cancel;
2230
2231 err = xfrm_if_id_put(skb, x->if_id);
2232 if (err)
2233 goto out_cancel;
2234
2235 nlmsg_end(skb, nlh);
2236 return 0;
2237
2238 out_cancel:
2239 nlmsg_cancel(skb, nlh);
2240 return err;
2241 }
2242
xfrm_get_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2243 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2244 struct nlattr **attrs)
2245 {
2246 struct net *net = sock_net(skb->sk);
2247 struct xfrm_state *x;
2248 struct sk_buff *r_skb;
2249 int err;
2250 struct km_event c;
2251 u32 mark;
2252 struct xfrm_mark m;
2253 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2254 struct xfrm_usersa_id *id = &p->sa_id;
2255
2256 mark = xfrm_mark_get(attrs, &m);
2257
2258 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2259 if (x == NULL)
2260 return -ESRCH;
2261
2262 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2263 if (r_skb == NULL) {
2264 xfrm_state_put(x);
2265 return -ENOMEM;
2266 }
2267
2268 /*
2269 * XXX: is this lock really needed - none of the other
2270 * gets lock (the concern is things getting updated
2271 * while we are still reading) - jhs
2272 */
2273 spin_lock_bh(&x->lock);
2274 c.data.aevent = p->flags;
2275 c.seq = nlh->nlmsg_seq;
2276 c.portid = nlh->nlmsg_pid;
2277
2278 err = build_aevent(r_skb, x, &c);
2279 BUG_ON(err < 0);
2280
2281 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2282 spin_unlock_bh(&x->lock);
2283 xfrm_state_put(x);
2284 return err;
2285 }
2286
xfrm_new_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2287 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2288 struct nlattr **attrs)
2289 {
2290 struct net *net = sock_net(skb->sk);
2291 struct xfrm_state *x;
2292 struct km_event c;
2293 int err = -EINVAL;
2294 u32 mark = 0;
2295 struct xfrm_mark m;
2296 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2297 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2298 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2299 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2300 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2301 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2302
2303 if (!lt && !rp && !re && !et && !rt)
2304 return err;
2305
2306 /* pedantic mode - thou shalt sayeth replaceth */
2307 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2308 return err;
2309
2310 mark = xfrm_mark_get(attrs, &m);
2311
2312 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2313 if (x == NULL)
2314 return -ESRCH;
2315
2316 if (x->km.state != XFRM_STATE_VALID)
2317 goto out;
2318
2319 err = xfrm_replay_verify_len(x->replay_esn, re);
2320 if (err)
2321 goto out;
2322
2323 spin_lock_bh(&x->lock);
2324 xfrm_update_ae_params(x, attrs, 1);
2325 spin_unlock_bh(&x->lock);
2326
2327 c.event = nlh->nlmsg_type;
2328 c.seq = nlh->nlmsg_seq;
2329 c.portid = nlh->nlmsg_pid;
2330 c.data.aevent = XFRM_AE_CU;
2331 km_state_notify(x, &c);
2332 err = 0;
2333 out:
2334 xfrm_state_put(x);
2335 return err;
2336 }
2337
xfrm_flush_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2338 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2339 struct nlattr **attrs)
2340 {
2341 struct net *net = sock_net(skb->sk);
2342 struct km_event c;
2343 u8 type = XFRM_POLICY_TYPE_MAIN;
2344 int err;
2345
2346 err = copy_from_user_policy_type(&type, attrs);
2347 if (err)
2348 return err;
2349
2350 err = xfrm_policy_flush(net, type, true);
2351 if (err) {
2352 if (err == -ESRCH) /* empty table */
2353 return 0;
2354 return err;
2355 }
2356
2357 c.data.type = type;
2358 c.event = nlh->nlmsg_type;
2359 c.seq = nlh->nlmsg_seq;
2360 c.portid = nlh->nlmsg_pid;
2361 c.net = net;
2362 km_policy_notify(NULL, 0, &c);
2363 return 0;
2364 }
2365
xfrm_add_pol_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2366 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2367 struct nlattr **attrs)
2368 {
2369 struct net *net = sock_net(skb->sk);
2370 struct xfrm_policy *xp;
2371 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2372 struct xfrm_userpolicy_info *p = &up->pol;
2373 u8 type = XFRM_POLICY_TYPE_MAIN;
2374 int err = -ENOENT;
2375 struct xfrm_mark m;
2376 u32 if_id = 0;
2377
2378 err = copy_from_user_policy_type(&type, attrs);
2379 if (err)
2380 return err;
2381
2382 err = verify_policy_dir(p->dir);
2383 if (err)
2384 return err;
2385
2386 if (attrs[XFRMA_IF_ID])
2387 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2388
2389 xfrm_mark_get(attrs, &m);
2390
2391 if (p->index)
2392 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2393 0, &err);
2394 else {
2395 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2396 struct xfrm_sec_ctx *ctx;
2397
2398 err = verify_sec_ctx_len(attrs);
2399 if (err)
2400 return err;
2401
2402 ctx = NULL;
2403 if (rt) {
2404 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2405
2406 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2407 if (err)
2408 return err;
2409 }
2410 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2411 &p->sel, ctx, 0, &err);
2412 security_xfrm_policy_free(ctx);
2413 }
2414 if (xp == NULL)
2415 return -ENOENT;
2416
2417 if (unlikely(xp->walk.dead))
2418 goto out;
2419
2420 err = 0;
2421 if (up->hard) {
2422 xfrm_policy_delete(xp, p->dir);
2423 xfrm_audit_policy_delete(xp, 1, true);
2424 }
2425 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2426
2427 out:
2428 xfrm_pol_put(xp);
2429 return err;
2430 }
2431
xfrm_add_sa_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2432 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2433 struct nlattr **attrs)
2434 {
2435 struct net *net = sock_net(skb->sk);
2436 struct xfrm_state *x;
2437 int err;
2438 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2439 struct xfrm_usersa_info *p = &ue->state;
2440 struct xfrm_mark m;
2441 u32 mark = xfrm_mark_get(attrs, &m);
2442
2443 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2444
2445 err = -ENOENT;
2446 if (x == NULL)
2447 return err;
2448
2449 spin_lock_bh(&x->lock);
2450 err = -EINVAL;
2451 if (x->km.state != XFRM_STATE_VALID)
2452 goto out;
2453 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2454
2455 if (ue->hard) {
2456 __xfrm_state_delete(x);
2457 xfrm_audit_state_delete(x, 1, true);
2458 }
2459 err = 0;
2460 out:
2461 spin_unlock_bh(&x->lock);
2462 xfrm_state_put(x);
2463 return err;
2464 }
2465
xfrm_add_acquire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2466 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2467 struct nlattr **attrs)
2468 {
2469 struct net *net = sock_net(skb->sk);
2470 struct xfrm_policy *xp;
2471 struct xfrm_user_tmpl *ut;
2472 int i;
2473 struct nlattr *rt = attrs[XFRMA_TMPL];
2474 struct xfrm_mark mark;
2475
2476 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2477 struct xfrm_state *x = xfrm_state_alloc(net);
2478 int err = -ENOMEM;
2479
2480 if (!x)
2481 goto nomem;
2482
2483 xfrm_mark_get(attrs, &mark);
2484
2485 err = verify_newpolicy_info(&ua->policy);
2486 if (err)
2487 goto free_state;
2488 err = verify_sec_ctx_len(attrs);
2489 if (err)
2490 goto free_state;
2491
2492 /* build an XP */
2493 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2494 if (!xp)
2495 goto free_state;
2496
2497 memcpy(&x->id, &ua->id, sizeof(ua->id));
2498 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2499 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2500 xp->mark.m = x->mark.m = mark.m;
2501 xp->mark.v = x->mark.v = mark.v;
2502 ut = nla_data(rt);
2503 /* extract the templates and for each call km_key */
2504 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2505 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2506 memcpy(&x->id, &t->id, sizeof(x->id));
2507 x->props.mode = t->mode;
2508 x->props.reqid = t->reqid;
2509 x->props.family = ut->family;
2510 t->aalgos = ua->aalgos;
2511 t->ealgos = ua->ealgos;
2512 t->calgos = ua->calgos;
2513 err = km_query(x, t, xp);
2514
2515 }
2516
2517 xfrm_state_free(x);
2518 kfree(xp);
2519
2520 return 0;
2521
2522 free_state:
2523 xfrm_state_free(x);
2524 nomem:
2525 return err;
2526 }
2527
2528 #ifdef CONFIG_XFRM_MIGRATE
copy_from_user_migrate(struct xfrm_migrate * ma,struct xfrm_kmaddress * k,struct nlattr ** attrs,int * num)2529 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2530 struct xfrm_kmaddress *k,
2531 struct nlattr **attrs, int *num)
2532 {
2533 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2534 struct xfrm_user_migrate *um;
2535 int i, num_migrate;
2536
2537 if (k != NULL) {
2538 struct xfrm_user_kmaddress *uk;
2539
2540 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2541 memcpy(&k->local, &uk->local, sizeof(k->local));
2542 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2543 k->family = uk->family;
2544 k->reserved = uk->reserved;
2545 }
2546
2547 um = nla_data(rt);
2548 num_migrate = nla_len(rt) / sizeof(*um);
2549
2550 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2551 return -EINVAL;
2552
2553 for (i = 0; i < num_migrate; i++, um++, ma++) {
2554 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2555 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2556 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2557 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2558
2559 ma->proto = um->proto;
2560 ma->mode = um->mode;
2561 ma->reqid = um->reqid;
2562
2563 ma->old_family = um->old_family;
2564 ma->new_family = um->new_family;
2565 }
2566
2567 *num = i;
2568 return 0;
2569 }
2570
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2571 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2572 struct nlattr **attrs)
2573 {
2574 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2575 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2576 struct xfrm_kmaddress km, *kmp;
2577 u8 type;
2578 int err;
2579 int n = 0;
2580 struct net *net = sock_net(skb->sk);
2581 struct xfrm_encap_tmpl *encap = NULL;
2582
2583 if (attrs[XFRMA_MIGRATE] == NULL)
2584 return -EINVAL;
2585
2586 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2587
2588 err = copy_from_user_policy_type(&type, attrs);
2589 if (err)
2590 return err;
2591
2592 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2593 if (err)
2594 return err;
2595
2596 if (!n)
2597 return 0;
2598
2599 if (attrs[XFRMA_ENCAP]) {
2600 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2601 sizeof(*encap), GFP_KERNEL);
2602 if (!encap)
2603 return -ENOMEM;
2604 }
2605
2606 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2607
2608 kfree(encap);
2609
2610 return err;
2611 }
2612 #else
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2613 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2614 struct nlattr **attrs)
2615 {
2616 return -ENOPROTOOPT;
2617 }
2618 #endif
2619
2620 #ifdef CONFIG_XFRM_MIGRATE
copy_to_user_migrate(const struct xfrm_migrate * m,struct sk_buff * skb)2621 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2622 {
2623 struct xfrm_user_migrate um;
2624
2625 memset(&um, 0, sizeof(um));
2626 um.proto = m->proto;
2627 um.mode = m->mode;
2628 um.reqid = m->reqid;
2629 um.old_family = m->old_family;
2630 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2631 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2632 um.new_family = m->new_family;
2633 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2634 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2635
2636 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2637 }
2638
copy_to_user_kmaddress(const struct xfrm_kmaddress * k,struct sk_buff * skb)2639 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2640 {
2641 struct xfrm_user_kmaddress uk;
2642
2643 memset(&uk, 0, sizeof(uk));
2644 uk.family = k->family;
2645 uk.reserved = k->reserved;
2646 memcpy(&uk.local, &k->local, sizeof(uk.local));
2647 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2648
2649 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2650 }
2651
xfrm_migrate_msgsize(int num_migrate,int with_kma,int with_encp)2652 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2653 int with_encp)
2654 {
2655 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2656 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2657 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2658 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2659 + userpolicy_type_attrsize();
2660 }
2661
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)2662 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2663 int num_migrate, const struct xfrm_kmaddress *k,
2664 const struct xfrm_selector *sel,
2665 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2666 {
2667 const struct xfrm_migrate *mp;
2668 struct xfrm_userpolicy_id *pol_id;
2669 struct nlmsghdr *nlh;
2670 int i, err;
2671
2672 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2673 if (nlh == NULL)
2674 return -EMSGSIZE;
2675
2676 pol_id = nlmsg_data(nlh);
2677 /* copy data from selector, dir, and type to the pol_id */
2678 memset(pol_id, 0, sizeof(*pol_id));
2679 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2680 pol_id->dir = dir;
2681
2682 if (k != NULL) {
2683 err = copy_to_user_kmaddress(k, skb);
2684 if (err)
2685 goto out_cancel;
2686 }
2687 if (encap) {
2688 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2689 if (err)
2690 goto out_cancel;
2691 }
2692 err = copy_to_user_policy_type(type, skb);
2693 if (err)
2694 goto out_cancel;
2695 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2696 err = copy_to_user_migrate(mp, skb);
2697 if (err)
2698 goto out_cancel;
2699 }
2700
2701 nlmsg_end(skb, nlh);
2702 return 0;
2703
2704 out_cancel:
2705 nlmsg_cancel(skb, nlh);
2706 return err;
2707 }
2708
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)2709 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2710 const struct xfrm_migrate *m, int num_migrate,
2711 const struct xfrm_kmaddress *k,
2712 const struct xfrm_encap_tmpl *encap)
2713 {
2714 struct net *net = &init_net;
2715 struct sk_buff *skb;
2716 int err;
2717
2718 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2719 GFP_ATOMIC);
2720 if (skb == NULL)
2721 return -ENOMEM;
2722
2723 /* build migrate */
2724 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2725 BUG_ON(err < 0);
2726
2727 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2728 }
2729 #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)2730 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2731 const struct xfrm_migrate *m, int num_migrate,
2732 const struct xfrm_kmaddress *k,
2733 const struct xfrm_encap_tmpl *encap)
2734 {
2735 return -ENOPROTOOPT;
2736 }
2737 #endif
2738
2739 #define XMSGSIZE(type) sizeof(struct type)
2740
2741 const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2742 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2743 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2744 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2745 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2746 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2747 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2748 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2749 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2750 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2751 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2752 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2753 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2754 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2755 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2756 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2757 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2758 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2759 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2760 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2761 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2762 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2763 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
2764 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default),
2765 };
2766 EXPORT_SYMBOL_GPL(xfrm_msg_min);
2767
2768 #undef XMSGSIZE
2769
2770 const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2771 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2772 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2773 [XFRMA_LASTUSED] = { .type = NLA_U64},
2774 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2775 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2776 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2777 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2778 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2779 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2780 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2781 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2782 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2783 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2784 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2785 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2786 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2787 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2788 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2789 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2790 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2791 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2792 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2793 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2794 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2795 [XFRMA_PROTO] = { .type = NLA_U8 },
2796 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2797 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2798 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2799 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2800 [XFRMA_IF_ID] = { .type = NLA_U32 },
2801 };
2802 EXPORT_SYMBOL_GPL(xfrma_policy);
2803
2804 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2805 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2806 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2807 };
2808
2809 static const struct xfrm_link {
2810 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2811 int (*start)(struct netlink_callback *);
2812 int (*dump)(struct sk_buff *, struct netlink_callback *);
2813 int (*done)(struct netlink_callback *);
2814 const struct nla_policy *nla_pol;
2815 int nla_max;
2816 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2817 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2818 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2819 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2820 .dump = xfrm_dump_sa,
2821 .done = xfrm_dump_sa_done },
2822 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2823 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2824 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2825 .start = xfrm_dump_policy_start,
2826 .dump = xfrm_dump_policy,
2827 .done = xfrm_dump_policy_done },
2828 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2829 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2830 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2831 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2832 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2833 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2834 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2835 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2836 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2837 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2838 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2839 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2840 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2841 .nla_pol = xfrma_spd_policy,
2842 .nla_max = XFRMA_SPD_MAX },
2843 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2844 [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default },
2845 [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
2846 };
2847
xfrm_user_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)2848 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2849 struct netlink_ext_ack *extack)
2850 {
2851 struct net *net = sock_net(skb->sk);
2852 struct nlattr *attrs[XFRMA_MAX+1];
2853 const struct xfrm_link *link;
2854 struct nlmsghdr *nlh64 = NULL;
2855 int type, err;
2856
2857 type = nlh->nlmsg_type;
2858 if (type > XFRM_MSG_MAX)
2859 return -EINVAL;
2860
2861 type -= XFRM_MSG_BASE;
2862 link = &xfrm_dispatch[type];
2863
2864 /* All operations require privileges, even GET */
2865 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2866 return -EPERM;
2867
2868 if (in_compat_syscall()) {
2869 struct xfrm_translator *xtr = xfrm_get_translator();
2870
2871 if (!xtr)
2872 return -EOPNOTSUPP;
2873
2874 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
2875 link->nla_pol, extack);
2876 xfrm_put_translator(xtr);
2877 if (IS_ERR(nlh64))
2878 return PTR_ERR(nlh64);
2879 if (nlh64)
2880 nlh = nlh64;
2881 }
2882
2883 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2884 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2885 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2886 struct netlink_dump_control c = {
2887 .start = link->start,
2888 .dump = link->dump,
2889 .done = link->done,
2890 };
2891
2892 if (link->dump == NULL) {
2893 err = -EINVAL;
2894 goto err;
2895 }
2896
2897 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2898 goto err;
2899 }
2900
2901 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2902 link->nla_max ? : XFRMA_MAX,
2903 link->nla_pol ? : xfrma_policy, extack);
2904 if (err < 0)
2905 goto err;
2906
2907 if (link->doit == NULL) {
2908 err = -EINVAL;
2909 goto err;
2910 }
2911
2912 err = link->doit(skb, nlh, attrs);
2913
2914 /* We need to free skb allocated in xfrm_alloc_compat() before
2915 * returning from this function, because consume_skb() won't take
2916 * care of frag_list since netlink destructor sets
2917 * sbk->head to NULL. (see netlink_skb_destructor())
2918 */
2919 if (skb_has_frag_list(skb)) {
2920 kfree_skb(skb_shinfo(skb)->frag_list);
2921 skb_shinfo(skb)->frag_list = NULL;
2922 }
2923
2924 err:
2925 kvfree(nlh64);
2926 return err;
2927 }
2928
xfrm_netlink_rcv(struct sk_buff * skb)2929 static void xfrm_netlink_rcv(struct sk_buff *skb)
2930 {
2931 struct net *net = sock_net(skb->sk);
2932
2933 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2934 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2935 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2936 }
2937
xfrm_expire_msgsize(void)2938 static inline unsigned int xfrm_expire_msgsize(void)
2939 {
2940 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2941 + nla_total_size(sizeof(struct xfrm_mark));
2942 }
2943
build_expire(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2944 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2945 {
2946 struct xfrm_user_expire *ue;
2947 struct nlmsghdr *nlh;
2948 int err;
2949
2950 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2951 if (nlh == NULL)
2952 return -EMSGSIZE;
2953
2954 ue = nlmsg_data(nlh);
2955 copy_to_user_state(x, &ue->state);
2956 ue->hard = (c->data.hard != 0) ? 1 : 0;
2957 /* clear the padding bytes */
2958 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2959
2960 err = xfrm_mark_put(skb, &x->mark);
2961 if (err)
2962 return err;
2963
2964 err = xfrm_if_id_put(skb, x->if_id);
2965 if (err)
2966 return err;
2967
2968 nlmsg_end(skb, nlh);
2969 return 0;
2970 }
2971
xfrm_exp_state_notify(struct xfrm_state * x,const struct km_event * c)2972 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2973 {
2974 struct net *net = xs_net(x);
2975 struct sk_buff *skb;
2976
2977 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2978 if (skb == NULL)
2979 return -ENOMEM;
2980
2981 if (build_expire(skb, x, c) < 0) {
2982 kfree_skb(skb);
2983 return -EMSGSIZE;
2984 }
2985
2986 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2987 }
2988
xfrm_aevent_state_notify(struct xfrm_state * x,const struct km_event * c)2989 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2990 {
2991 struct net *net = xs_net(x);
2992 struct sk_buff *skb;
2993 int err;
2994
2995 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2996 if (skb == NULL)
2997 return -ENOMEM;
2998
2999 err = build_aevent(skb, x, c);
3000 BUG_ON(err < 0);
3001
3002 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
3003 }
3004
xfrm_notify_sa_flush(const struct km_event * c)3005 static int xfrm_notify_sa_flush(const struct km_event *c)
3006 {
3007 struct net *net = c->net;
3008 struct xfrm_usersa_flush *p;
3009 struct nlmsghdr *nlh;
3010 struct sk_buff *skb;
3011 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
3012
3013 skb = nlmsg_new(len, GFP_ATOMIC);
3014 if (skb == NULL)
3015 return -ENOMEM;
3016
3017 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
3018 if (nlh == NULL) {
3019 kfree_skb(skb);
3020 return -EMSGSIZE;
3021 }
3022
3023 p = nlmsg_data(nlh);
3024 p->proto = c->data.proto;
3025
3026 nlmsg_end(skb, nlh);
3027
3028 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3029 }
3030
xfrm_sa_len(struct xfrm_state * x)3031 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
3032 {
3033 unsigned int l = 0;
3034 if (x->aead)
3035 l += nla_total_size(aead_len(x->aead));
3036 if (x->aalg) {
3037 l += nla_total_size(sizeof(struct xfrm_algo) +
3038 (x->aalg->alg_key_len + 7) / 8);
3039 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
3040 }
3041 if (x->ealg)
3042 l += nla_total_size(xfrm_alg_len(x->ealg));
3043 if (x->calg)
3044 l += nla_total_size(sizeof(*x->calg));
3045 if (x->encap)
3046 l += nla_total_size(sizeof(*x->encap));
3047 if (x->tfcpad)
3048 l += nla_total_size(sizeof(x->tfcpad));
3049 if (x->replay_esn)
3050 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
3051 else
3052 l += nla_total_size(sizeof(struct xfrm_replay_state));
3053 if (x->security)
3054 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
3055 x->security->ctx_len);
3056 if (x->coaddr)
3057 l += nla_total_size(sizeof(*x->coaddr));
3058 if (x->props.extra_flags)
3059 l += nla_total_size(sizeof(x->props.extra_flags));
3060 if (x->xso.dev)
3061 l += nla_total_size(sizeof(x->xso));
3062 if (x->props.smark.v | x->props.smark.m) {
3063 l += nla_total_size(sizeof(x->props.smark.v));
3064 l += nla_total_size(sizeof(x->props.smark.m));
3065 }
3066 if (x->if_id)
3067 l += nla_total_size(sizeof(x->if_id));
3068
3069 /* Must count x->lastused as it may become non-zero behind our back. */
3070 l += nla_total_size_64bit(sizeof(u64));
3071
3072 return l;
3073 }
3074
xfrm_notify_sa(struct xfrm_state * x,const struct km_event * c)3075 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
3076 {
3077 struct net *net = xs_net(x);
3078 struct xfrm_usersa_info *p;
3079 struct xfrm_usersa_id *id;
3080 struct nlmsghdr *nlh;
3081 struct sk_buff *skb;
3082 unsigned int len = xfrm_sa_len(x);
3083 unsigned int headlen;
3084 int err;
3085
3086 headlen = sizeof(*p);
3087 if (c->event == XFRM_MSG_DELSA) {
3088 len += nla_total_size(headlen);
3089 headlen = sizeof(*id);
3090 len += nla_total_size(sizeof(struct xfrm_mark));
3091 }
3092 len += NLMSG_ALIGN(headlen);
3093
3094 skb = nlmsg_new(len, GFP_ATOMIC);
3095 if (skb == NULL)
3096 return -ENOMEM;
3097
3098 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3099 err = -EMSGSIZE;
3100 if (nlh == NULL)
3101 goto out_free_skb;
3102
3103 p = nlmsg_data(nlh);
3104 if (c->event == XFRM_MSG_DELSA) {
3105 struct nlattr *attr;
3106
3107 id = nlmsg_data(nlh);
3108 memset(id, 0, sizeof(*id));
3109 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
3110 id->spi = x->id.spi;
3111 id->family = x->props.family;
3112 id->proto = x->id.proto;
3113
3114 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
3115 err = -EMSGSIZE;
3116 if (attr == NULL)
3117 goto out_free_skb;
3118
3119 p = nla_data(attr);
3120 }
3121 err = copy_to_user_state_extra(x, p, skb);
3122 if (err)
3123 goto out_free_skb;
3124
3125 nlmsg_end(skb, nlh);
3126
3127 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
3128
3129 out_free_skb:
3130 kfree_skb(skb);
3131 return err;
3132 }
3133
xfrm_send_state_notify(struct xfrm_state * x,const struct km_event * c)3134 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
3135 {
3136
3137 switch (c->event) {
3138 case XFRM_MSG_EXPIRE:
3139 return xfrm_exp_state_notify(x, c);
3140 case XFRM_MSG_NEWAE:
3141 return xfrm_aevent_state_notify(x, c);
3142 case XFRM_MSG_DELSA:
3143 case XFRM_MSG_UPDSA:
3144 case XFRM_MSG_NEWSA:
3145 return xfrm_notify_sa(x, c);
3146 case XFRM_MSG_FLUSHSA:
3147 return xfrm_notify_sa_flush(c);
3148 default:
3149 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3150 c->event);
3151 break;
3152 }
3153
3154 return 0;
3155
3156 }
3157
xfrm_acquire_msgsize(struct xfrm_state * x,struct xfrm_policy * xp)3158 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3159 struct xfrm_policy *xp)
3160 {
3161 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3162 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3163 + nla_total_size(sizeof(struct xfrm_mark))
3164 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3165 + userpolicy_type_attrsize();
3166 }
3167
build_acquire(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3168 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3169 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3170 {
3171 __u32 seq = xfrm_get_acqseq();
3172 struct xfrm_user_acquire *ua;
3173 struct nlmsghdr *nlh;
3174 int err;
3175
3176 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3177 if (nlh == NULL)
3178 return -EMSGSIZE;
3179
3180 ua = nlmsg_data(nlh);
3181 memcpy(&ua->id, &x->id, sizeof(ua->id));
3182 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3183 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3184 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3185 ua->aalgos = xt->aalgos;
3186 ua->ealgos = xt->ealgos;
3187 ua->calgos = xt->calgos;
3188 ua->seq = x->km.seq = seq;
3189
3190 err = copy_to_user_tmpl(xp, skb);
3191 if (!err)
3192 err = copy_to_user_state_sec_ctx(x, skb);
3193 if (!err)
3194 err = copy_to_user_policy_type(xp->type, skb);
3195 if (!err)
3196 err = xfrm_mark_put(skb, &xp->mark);
3197 if (!err)
3198 err = xfrm_if_id_put(skb, xp->if_id);
3199 if (err) {
3200 nlmsg_cancel(skb, nlh);
3201 return err;
3202 }
3203
3204 nlmsg_end(skb, nlh);
3205 return 0;
3206 }
3207
xfrm_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)3208 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3209 struct xfrm_policy *xp)
3210 {
3211 struct net *net = xs_net(x);
3212 struct sk_buff *skb;
3213 int err;
3214
3215 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3216 if (skb == NULL)
3217 return -ENOMEM;
3218
3219 err = build_acquire(skb, x, xt, xp);
3220 BUG_ON(err < 0);
3221
3222 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3223 }
3224
3225 /* User gives us xfrm_user_policy_info followed by an array of 0
3226 * or more templates.
3227 */
xfrm_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)3228 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3229 u8 *data, int len, int *dir)
3230 {
3231 struct net *net = sock_net(sk);
3232 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3233 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3234 struct xfrm_policy *xp;
3235 int nr;
3236
3237 switch (sk->sk_family) {
3238 case AF_INET:
3239 if (opt != IP_XFRM_POLICY) {
3240 *dir = -EOPNOTSUPP;
3241 return NULL;
3242 }
3243 break;
3244 #if IS_ENABLED(CONFIG_IPV6)
3245 case AF_INET6:
3246 if (opt != IPV6_XFRM_POLICY) {
3247 *dir = -EOPNOTSUPP;
3248 return NULL;
3249 }
3250 break;
3251 #endif
3252 default:
3253 *dir = -EINVAL;
3254 return NULL;
3255 }
3256
3257 *dir = -EINVAL;
3258
3259 if (len < sizeof(*p) ||
3260 verify_newpolicy_info(p))
3261 return NULL;
3262
3263 nr = ((len - sizeof(*p)) / sizeof(*ut));
3264 if (validate_tmpl(nr, ut, p->sel.family))
3265 return NULL;
3266
3267 if (p->dir > XFRM_POLICY_OUT)
3268 return NULL;
3269
3270 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3271 if (xp == NULL) {
3272 *dir = -ENOBUFS;
3273 return NULL;
3274 }
3275
3276 copy_from_user_policy(xp, p);
3277 xp->type = XFRM_POLICY_TYPE_MAIN;
3278 copy_templates(xp, ut, nr);
3279
3280 *dir = p->dir;
3281
3282 return xp;
3283 }
3284
xfrm_polexpire_msgsize(struct xfrm_policy * xp)3285 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3286 {
3287 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3288 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3289 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3290 + nla_total_size(sizeof(struct xfrm_mark))
3291 + userpolicy_type_attrsize();
3292 }
3293
build_polexpire(struct sk_buff * skb,struct xfrm_policy * xp,int dir,const struct km_event * c)3294 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3295 int dir, const struct km_event *c)
3296 {
3297 struct xfrm_user_polexpire *upe;
3298 int hard = c->data.hard;
3299 struct nlmsghdr *nlh;
3300 int err;
3301
3302 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3303 if (nlh == NULL)
3304 return -EMSGSIZE;
3305
3306 upe = nlmsg_data(nlh);
3307 copy_to_user_policy(xp, &upe->pol, dir);
3308 err = copy_to_user_tmpl(xp, skb);
3309 if (!err)
3310 err = copy_to_user_sec_ctx(xp, skb);
3311 if (!err)
3312 err = copy_to_user_policy_type(xp->type, skb);
3313 if (!err)
3314 err = xfrm_mark_put(skb, &xp->mark);
3315 if (!err)
3316 err = xfrm_if_id_put(skb, xp->if_id);
3317 if (err) {
3318 nlmsg_cancel(skb, nlh);
3319 return err;
3320 }
3321 upe->hard = !!hard;
3322
3323 nlmsg_end(skb, nlh);
3324 return 0;
3325 }
3326
xfrm_exp_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3327 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3328 {
3329 struct net *net = xp_net(xp);
3330 struct sk_buff *skb;
3331 int err;
3332
3333 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3334 if (skb == NULL)
3335 return -ENOMEM;
3336
3337 err = build_polexpire(skb, xp, dir, c);
3338 BUG_ON(err < 0);
3339
3340 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3341 }
3342
xfrm_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)3343 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3344 {
3345 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3346 struct net *net = xp_net(xp);
3347 struct xfrm_userpolicy_info *p;
3348 struct xfrm_userpolicy_id *id;
3349 struct nlmsghdr *nlh;
3350 struct sk_buff *skb;
3351 unsigned int headlen;
3352 int err;
3353
3354 headlen = sizeof(*p);
3355 if (c->event == XFRM_MSG_DELPOLICY) {
3356 len += nla_total_size(headlen);
3357 headlen = sizeof(*id);
3358 }
3359 len += userpolicy_type_attrsize();
3360 len += nla_total_size(sizeof(struct xfrm_mark));
3361 len += NLMSG_ALIGN(headlen);
3362
3363 skb = nlmsg_new(len, GFP_ATOMIC);
3364 if (skb == NULL)
3365 return -ENOMEM;
3366
3367 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3368 err = -EMSGSIZE;
3369 if (nlh == NULL)
3370 goto out_free_skb;
3371
3372 p = nlmsg_data(nlh);
3373 if (c->event == XFRM_MSG_DELPOLICY) {
3374 struct nlattr *attr;
3375
3376 id = nlmsg_data(nlh);
3377 memset(id, 0, sizeof(*id));
3378 id->dir = dir;
3379 if (c->data.byid)
3380 id->index = xp->index;
3381 else
3382 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3383
3384 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3385 err = -EMSGSIZE;
3386 if (attr == NULL)
3387 goto out_free_skb;
3388
3389 p = nla_data(attr);
3390 }
3391
3392 copy_to_user_policy(xp, p, dir);
3393 err = copy_to_user_tmpl(xp, skb);
3394 if (!err)
3395 err = copy_to_user_policy_type(xp->type, skb);
3396 if (!err)
3397 err = xfrm_mark_put(skb, &xp->mark);
3398 if (!err)
3399 err = xfrm_if_id_put(skb, xp->if_id);
3400 if (err)
3401 goto out_free_skb;
3402
3403 nlmsg_end(skb, nlh);
3404
3405 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3406
3407 out_free_skb:
3408 kfree_skb(skb);
3409 return err;
3410 }
3411
xfrm_notify_policy_flush(const struct km_event * c)3412 static int xfrm_notify_policy_flush(const struct km_event *c)
3413 {
3414 struct net *net = c->net;
3415 struct nlmsghdr *nlh;
3416 struct sk_buff *skb;
3417 int err;
3418
3419 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3420 if (skb == NULL)
3421 return -ENOMEM;
3422
3423 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3424 err = -EMSGSIZE;
3425 if (nlh == NULL)
3426 goto out_free_skb;
3427 err = copy_to_user_policy_type(c->data.type, skb);
3428 if (err)
3429 goto out_free_skb;
3430
3431 nlmsg_end(skb, nlh);
3432
3433 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3434
3435 out_free_skb:
3436 kfree_skb(skb);
3437 return err;
3438 }
3439
xfrm_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)3440 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3441 {
3442
3443 switch (c->event) {
3444 case XFRM_MSG_NEWPOLICY:
3445 case XFRM_MSG_UPDPOLICY:
3446 case XFRM_MSG_DELPOLICY:
3447 return xfrm_notify_policy(xp, dir, c);
3448 case XFRM_MSG_FLUSHPOLICY:
3449 return xfrm_notify_policy_flush(c);
3450 case XFRM_MSG_POLEXPIRE:
3451 return xfrm_exp_policy_notify(xp, dir, c);
3452 default:
3453 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3454 c->event);
3455 }
3456
3457 return 0;
3458
3459 }
3460
xfrm_report_msgsize(void)3461 static inline unsigned int xfrm_report_msgsize(void)
3462 {
3463 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3464 }
3465
build_report(struct sk_buff * skb,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3466 static int build_report(struct sk_buff *skb, u8 proto,
3467 struct xfrm_selector *sel, xfrm_address_t *addr)
3468 {
3469 struct xfrm_user_report *ur;
3470 struct nlmsghdr *nlh;
3471
3472 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3473 if (nlh == NULL)
3474 return -EMSGSIZE;
3475
3476 ur = nlmsg_data(nlh);
3477 ur->proto = proto;
3478 memcpy(&ur->sel, sel, sizeof(ur->sel));
3479
3480 if (addr) {
3481 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3482 if (err) {
3483 nlmsg_cancel(skb, nlh);
3484 return err;
3485 }
3486 }
3487 nlmsg_end(skb, nlh);
3488 return 0;
3489 }
3490
xfrm_send_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3491 static int xfrm_send_report(struct net *net, u8 proto,
3492 struct xfrm_selector *sel, xfrm_address_t *addr)
3493 {
3494 struct sk_buff *skb;
3495 int err;
3496
3497 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3498 if (skb == NULL)
3499 return -ENOMEM;
3500
3501 err = build_report(skb, proto, sel, addr);
3502 BUG_ON(err < 0);
3503
3504 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3505 }
3506
xfrm_mapping_msgsize(void)3507 static inline unsigned int xfrm_mapping_msgsize(void)
3508 {
3509 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3510 }
3511
build_mapping(struct sk_buff * skb,struct xfrm_state * x,xfrm_address_t * new_saddr,__be16 new_sport)3512 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3513 xfrm_address_t *new_saddr, __be16 new_sport)
3514 {
3515 struct xfrm_user_mapping *um;
3516 struct nlmsghdr *nlh;
3517
3518 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3519 if (nlh == NULL)
3520 return -EMSGSIZE;
3521
3522 um = nlmsg_data(nlh);
3523
3524 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3525 um->id.spi = x->id.spi;
3526 um->id.family = x->props.family;
3527 um->id.proto = x->id.proto;
3528 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3529 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3530 um->new_sport = new_sport;
3531 um->old_sport = x->encap->encap_sport;
3532 um->reqid = x->props.reqid;
3533
3534 nlmsg_end(skb, nlh);
3535 return 0;
3536 }
3537
xfrm_send_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)3538 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3539 __be16 sport)
3540 {
3541 struct net *net = xs_net(x);
3542 struct sk_buff *skb;
3543 int err;
3544
3545 if (x->id.proto != IPPROTO_ESP)
3546 return -EINVAL;
3547
3548 if (!x->encap)
3549 return -EINVAL;
3550
3551 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3552 if (skb == NULL)
3553 return -ENOMEM;
3554
3555 err = build_mapping(skb, x, ipaddr, sport);
3556 BUG_ON(err < 0);
3557
3558 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3559 }
3560
xfrm_is_alive(const struct km_event * c)3561 static bool xfrm_is_alive(const struct km_event *c)
3562 {
3563 return (bool)xfrm_acquire_is_on(c->net);
3564 }
3565
3566 static struct xfrm_mgr netlink_mgr = {
3567 .notify = xfrm_send_state_notify,
3568 .acquire = xfrm_send_acquire,
3569 .compile_policy = xfrm_compile_policy,
3570 .notify_policy = xfrm_send_policy_notify,
3571 .report = xfrm_send_report,
3572 .migrate = xfrm_send_migrate,
3573 .new_mapping = xfrm_send_mapping,
3574 .is_alive = xfrm_is_alive,
3575 };
3576
xfrm_user_net_init(struct net * net)3577 static int __net_init xfrm_user_net_init(struct net *net)
3578 {
3579 struct sock *nlsk;
3580 struct netlink_kernel_cfg cfg = {
3581 .groups = XFRMNLGRP_MAX,
3582 .input = xfrm_netlink_rcv,
3583 };
3584
3585 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3586 if (nlsk == NULL)
3587 return -ENOMEM;
3588 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3589 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3590 return 0;
3591 }
3592
xfrm_user_net_pre_exit(struct net * net)3593 static void __net_exit xfrm_user_net_pre_exit(struct net *net)
3594 {
3595 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3596 }
3597
xfrm_user_net_exit(struct list_head * net_exit_list)3598 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3599 {
3600 struct net *net;
3601
3602 list_for_each_entry(net, net_exit_list, exit_list)
3603 netlink_kernel_release(net->xfrm.nlsk_stash);
3604 }
3605
3606 static struct pernet_operations xfrm_user_net_ops = {
3607 .init = xfrm_user_net_init,
3608 .pre_exit = xfrm_user_net_pre_exit,
3609 .exit_batch = xfrm_user_net_exit,
3610 };
3611
xfrm_user_init(void)3612 static int __init xfrm_user_init(void)
3613 {
3614 int rv;
3615
3616 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3617
3618 rv = register_pernet_subsys(&xfrm_user_net_ops);
3619 if (rv < 0)
3620 return rv;
3621 rv = xfrm_register_km(&netlink_mgr);
3622 if (rv < 0)
3623 unregister_pernet_subsys(&xfrm_user_net_ops);
3624 return rv;
3625 }
3626
xfrm_user_exit(void)3627 static void __exit xfrm_user_exit(void)
3628 {
3629 xfrm_unregister_km(&netlink_mgr);
3630 unregister_pernet_subsys(&xfrm_user_net_ops);
3631 }
3632
3633 module_init(xfrm_user_init);
3634 module_exit(xfrm_user_exit);
3635 MODULE_LICENSE("GPL");
3636 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3637
