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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / net / xfrm / xfrm_user.c
blobca7a207b81a9587c942dd8763e4444cc5675f1ee
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <linux/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34 #include <asm/unaligned.h>
35
36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
37 {
38 struct nlattr *rt = attrs[type];
39 struct xfrm_algo *algp;
40
41 if (!rt)
42 return 0;
43
44 algp = nla_data(rt);
45 if (nla_len(rt) < (int)xfrm_alg_len(algp))
46 return -EINVAL;
47
48 switch (type) {
49 case XFRMA_ALG_AUTH:
50 case XFRMA_ALG_CRYPT:
51 case XFRMA_ALG_COMP:
52 break;
53
54 default:
55 return -EINVAL;
56 }
57
58 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
59 return 0;
60 }
61
62 static int verify_auth_trunc(struct nlattr **attrs)
63 {
64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
65 struct xfrm_algo_auth *algp;
66
67 if (!rt)
68 return 0;
69
70 algp = nla_data(rt);
71 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
72 return -EINVAL;
73
74 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
75 return 0;
76 }
77
78 static int verify_aead(struct nlattr **attrs)
79 {
80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
81 struct xfrm_algo_aead *algp;
82
83 if (!rt)
84 return 0;
85
86 algp = nla_data(rt);
87 if (nla_len(rt) < (int)aead_len(algp))
88 return -EINVAL;
89
90 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
91 return 0;
92 }
93
94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
95 xfrm_address_t **addrp)
96 {
97 struct nlattr *rt = attrs[type];
98
99 if (rt && addrp)
100 *addrp = nla_data(rt);
101 }
102
103 static inline int verify_sec_ctx_len(struct nlattr **attrs)
104 {
105 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
106 struct xfrm_user_sec_ctx *uctx;
107
108 if (!rt)
109 return 0;
110
111 uctx = nla_data(rt);
112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
113 return -EINVAL;
114
115 return 0;
116 }
117
118 static inline int verify_replay(struct xfrm_usersa_info *p,
119 struct nlattr **attrs)
120 {
121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
122 struct xfrm_replay_state_esn *rs;
123
124 if (!rt)
125 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
126
127 rs = nla_data(rt);
128
129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 return -EINVAL;
131
132 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
133 nla_len(rt) != sizeof(*rs))
134 return -EINVAL;
135
136 /* As only ESP and AH support ESN feature. */
137 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
138 return -EINVAL;
139
140 if (p->replay_window != 0)
141 return -EINVAL;
142
143 return 0;
144 }
145
146 static int verify_newsa_info(struct xfrm_usersa_info *p,
147 struct nlattr **attrs)
148 {
149 int err;
150
151 err = -EINVAL;
152 switch (p->family) {
153 case AF_INET:
154 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
155 goto out;
156
157 break;
158
159 case AF_INET6:
160 #if IS_ENABLED(CONFIG_IPV6)
161 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
162 goto out;
163
164 break;
165 #else
166 err = -EAFNOSUPPORT;
167 goto out;
168 #endif
169
170 default:
171 goto out;
172 }
173
174 err = -EINVAL;
175 switch (p->id.proto) {
176 case IPPROTO_AH:
177 if ((!attrs[XFRMA_ALG_AUTH] &&
178 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
179 attrs[XFRMA_ALG_AEAD] ||
180 attrs[XFRMA_ALG_CRYPT] ||
181 attrs[XFRMA_ALG_COMP] ||
182 attrs[XFRMA_TFCPAD])
183 goto out;
184 break;
185
186 case IPPROTO_ESP:
187 if (attrs[XFRMA_ALG_COMP])
188 goto out;
189 if (!attrs[XFRMA_ALG_AUTH] &&
190 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
191 !attrs[XFRMA_ALG_CRYPT] &&
192 !attrs[XFRMA_ALG_AEAD])
193 goto out;
194 if ((attrs[XFRMA_ALG_AUTH] ||
195 attrs[XFRMA_ALG_AUTH_TRUNC] ||
196 attrs[XFRMA_ALG_CRYPT]) &&
197 attrs[XFRMA_ALG_AEAD])
198 goto out;
199 if (attrs[XFRMA_TFCPAD] &&
200 p->mode != XFRM_MODE_TUNNEL)
201 goto out;
202 break;
203
204 case IPPROTO_COMP:
205 if (!attrs[XFRMA_ALG_COMP] ||
206 attrs[XFRMA_ALG_AEAD] ||
207 attrs[XFRMA_ALG_AUTH] ||
208 attrs[XFRMA_ALG_AUTH_TRUNC] ||
209 attrs[XFRMA_ALG_CRYPT] ||
210 attrs[XFRMA_TFCPAD] ||
211 (ntohl(p->id.spi) >= 0x10000))
212 goto out;
213 break;
214
215 #if IS_ENABLED(CONFIG_IPV6)
216 case IPPROTO_DSTOPTS:
217 case IPPROTO_ROUTING:
218 if (attrs[XFRMA_ALG_COMP] ||
219 attrs[XFRMA_ALG_AUTH] ||
220 attrs[XFRMA_ALG_AUTH_TRUNC] ||
221 attrs[XFRMA_ALG_AEAD] ||
222 attrs[XFRMA_ALG_CRYPT] ||
223 attrs[XFRMA_ENCAP] ||
224 attrs[XFRMA_SEC_CTX] ||
225 attrs[XFRMA_TFCPAD] ||
226 !attrs[XFRMA_COADDR])
227 goto out;
228 break;
229 #endif
230
231 default:
232 goto out;
233 }
234
235 if ((err = verify_aead(attrs)))
236 goto out;
237 if ((err = verify_auth_trunc(attrs)))
238 goto out;
239 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
240 goto out;
241 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
242 goto out;
243 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
244 goto out;
245 if ((err = verify_sec_ctx_len(attrs)))
246 goto out;
247 if ((err = verify_replay(p, attrs)))
248 goto out;
249
250 err = -EINVAL;
251 switch (p->mode) {
252 case XFRM_MODE_TRANSPORT:
253 case XFRM_MODE_TUNNEL:
254 case XFRM_MODE_ROUTEOPTIMIZATION:
255 case XFRM_MODE_BEET:
256 break;
257
258 default:
259 goto out;
260 }
261
262 err = 0;
263
264 out:
265 return err;
266 }
267
268 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
269 struct xfrm_algo_desc *(*get_byname)(const char *, int),
270 struct nlattr *rta)
271 {
272 struct xfrm_algo *p, *ualg;
273 struct xfrm_algo_desc *algo;
274
275 if (!rta)
276 return 0;
277
278 ualg = nla_data(rta);
279
280 algo = get_byname(ualg->alg_name, 1);
281 if (!algo)
282 return -ENOSYS;
283 *props = algo->desc.sadb_alg_id;
284
285 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
286 if (!p)
287 return -ENOMEM;
288
289 strcpy(p->alg_name, algo->name);
290 *algpp = p;
291 return 0;
292 }
293
294 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
295 {
296 struct xfrm_algo *p, *ualg;
297 struct xfrm_algo_desc *algo;
298
299 if (!rta)
300 return 0;
301
302 ualg = nla_data(rta);
303
304 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
305 if (!algo)
306 return -ENOSYS;
307 x->props.ealgo = algo->desc.sadb_alg_id;
308
309 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
310 if (!p)
311 return -ENOMEM;
312
313 strcpy(p->alg_name, algo->name);
314 x->ealg = p;
315 x->geniv = algo->uinfo.encr.geniv;
316 return 0;
317 }
318
319 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
320 struct nlattr *rta)
321 {
322 struct xfrm_algo *ualg;
323 struct xfrm_algo_auth *p;
324 struct xfrm_algo_desc *algo;
325
326 if (!rta)
327 return 0;
328
329 ualg = nla_data(rta);
330
331 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
332 if (!algo)
333 return -ENOSYS;
334 *props = algo->desc.sadb_alg_id;
335
336 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
337 if (!p)
338 return -ENOMEM;
339
340 strcpy(p->alg_name, algo->name);
341 p->alg_key_len = ualg->alg_key_len;
342 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
343 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
344
345 *algpp = p;
346 return 0;
347 }
348
349 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
350 struct nlattr *rta)
351 {
352 struct xfrm_algo_auth *p, *ualg;
353 struct xfrm_algo_desc *algo;
354
355 if (!rta)
356 return 0;
357
358 ualg = nla_data(rta);
359
360 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
361 if (!algo)
362 return -ENOSYS;
363 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
364 return -EINVAL;
365 *props = algo->desc.sadb_alg_id;
366
367 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
368 if (!p)
369 return -ENOMEM;
370
371 strcpy(p->alg_name, algo->name);
372 if (!p->alg_trunc_len)
373 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
374
375 *algpp = p;
376 return 0;
377 }
378
379 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
380 {
381 struct xfrm_algo_aead *p, *ualg;
382 struct xfrm_algo_desc *algo;
383
384 if (!rta)
385 return 0;
386
387 ualg = nla_data(rta);
388
389 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
390 if (!algo)
391 return -ENOSYS;
392 x->props.ealgo = algo->desc.sadb_alg_id;
393
394 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
395 if (!p)
396 return -ENOMEM;
397
398 strcpy(p->alg_name, algo->name);
399 x->aead = p;
400 x->geniv = algo->uinfo.aead.geniv;
401 return 0;
402 }
403
404 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
405 struct nlattr *rp)
406 {
407 struct xfrm_replay_state_esn *up;
408 unsigned int ulen;
409
410 if (!replay_esn || !rp)
411 return 0;
412
413 up = nla_data(rp);
414 ulen = xfrm_replay_state_esn_len(up);
415
416 /* Check the overall length and the internal bitmap length to avoid
417 * potential overflow. */
418 if (nla_len(rp) < (int)ulen ||
419 xfrm_replay_state_esn_len(replay_esn) != ulen ||
420 replay_esn->bmp_len != up->bmp_len)
421 return -EINVAL;
422
423 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
424 return -EINVAL;
425
426 return 0;
427 }
428
429 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
430 struct xfrm_replay_state_esn **preplay_esn,
431 struct nlattr *rta)
432 {
433 struct xfrm_replay_state_esn *p, *pp, *up;
434 unsigned int klen, ulen;
435
436 if (!rta)
437 return 0;
438
439 up = nla_data(rta);
440 klen = xfrm_replay_state_esn_len(up);
441 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
442
443 p = kzalloc(klen, GFP_KERNEL);
444 if (!p)
445 return -ENOMEM;
446
447 pp = kzalloc(klen, GFP_KERNEL);
448 if (!pp) {
449 kfree(p);
450 return -ENOMEM;
451 }
452
453 memcpy(p, up, ulen);
454 memcpy(pp, up, ulen);
455
456 *replay_esn = p;
457 *preplay_esn = pp;
458
459 return 0;
460 }
461
462 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
463 {
464 unsigned int len = 0;
465
466 if (xfrm_ctx) {
467 len += sizeof(struct xfrm_user_sec_ctx);
468 len += xfrm_ctx->ctx_len;
469 }
470 return len;
471 }
472
473 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
474 {
475 memcpy(&x->id, &p->id, sizeof(x->id));
476 memcpy(&x->sel, &p->sel, sizeof(x->sel));
477 memcpy(&x->lft, &p->lft, sizeof(x->lft));
478 x->props.mode = p->mode;
479 x->props.replay_window = min_t(unsigned int, p->replay_window,
480 sizeof(x->replay.bitmap) * 8);
481 x->props.reqid = p->reqid;
482 x->props.family = p->family;
483 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
484 x->props.flags = p->flags;
485
486 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
487 x->sel.family = p->family;
488 }
489
490 /*
491 * someday when pfkey also has support, we could have the code
492 * somehow made shareable and move it to xfrm_state.c - JHS
493 *
494 */
495 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
496 int update_esn)
497 {
498 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
499 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
500 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
501 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
502 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
503
504 if (re) {
505 struct xfrm_replay_state_esn *replay_esn;
506 replay_esn = nla_data(re);
507 memcpy(x->replay_esn, replay_esn,
508 xfrm_replay_state_esn_len(replay_esn));
509 memcpy(x->preplay_esn, replay_esn,
510 xfrm_replay_state_esn_len(replay_esn));
511 }
512
513 if (rp) {
514 struct xfrm_replay_state *replay;
515 replay = nla_data(rp);
516 memcpy(&x->replay, replay, sizeof(*replay));
517 memcpy(&x->preplay, replay, sizeof(*replay));
518 }
519
520 if (lt) {
521 struct xfrm_lifetime_cur *ltime;
522 ltime = nla_data(lt);
523 x->curlft.bytes = ltime->bytes;
524 x->curlft.packets = ltime->packets;
525 x->curlft.add_time = ltime->add_time;
526 x->curlft.use_time = ltime->use_time;
527 }
528
529 if (et)
530 x->replay_maxage = nla_get_u32(et);
531
532 if (rt)
533 x->replay_maxdiff = nla_get_u32(rt);
534 }
535
536 static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
537 {
538 if (attrs[XFRMA_SET_MARK]) {
539 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
540 if (attrs[XFRMA_SET_MARK_MASK])
541 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
542 else
543 m->m = 0xffffffff;
544 } else {
545 m->v = m->m = 0;
546 }
547 }
548
549 static struct xfrm_state *xfrm_state_construct(struct net *net,
550 struct xfrm_usersa_info *p,
551 struct nlattr **attrs,
552 int *errp)
553 {
554 struct xfrm_state *x = xfrm_state_alloc(net);
555 int err = -ENOMEM;
556
557 if (!x)
558 goto error_no_put;
559
560 copy_from_user_state(x, p);
561
562 if (attrs[XFRMA_SA_EXTRA_FLAGS])
563 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
564
565 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
566 goto error;
567 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
568 attrs[XFRMA_ALG_AUTH_TRUNC])))
569 goto error;
570 if (!x->props.aalgo) {
571 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
572 attrs[XFRMA_ALG_AUTH])))
573 goto error;
574 }
575 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
576 goto error;
577 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
578 xfrm_calg_get_byname,
579 attrs[XFRMA_ALG_COMP])))
580 goto error;
581
582 if (attrs[XFRMA_ENCAP]) {
583 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
584 sizeof(*x->encap), GFP_KERNEL);
585 if (x->encap == NULL)
586 goto error;
587 }
588
589 if (attrs[XFRMA_TFCPAD])
590 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
591
592 if (attrs[XFRMA_COADDR]) {
593 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
594 sizeof(*x->coaddr), GFP_KERNEL);
595 if (x->coaddr == NULL)
596 goto error;
597 }
598
599 xfrm_mark_get(attrs, &x->mark);
600
601 xfrm_smark_init(attrs, &x->props.smark);
602
603 if (attrs[XFRMA_IF_ID])
604 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
605
606 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
607 if (err)
608 goto error;
609
610 if (attrs[XFRMA_SEC_CTX]) {
611 err = security_xfrm_state_alloc(x,
612 nla_data(attrs[XFRMA_SEC_CTX]));
613 if (err)
614 goto error;
615 }
616
617 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
618 attrs[XFRMA_REPLAY_ESN_VAL])))
619 goto error;
620
621 x->km.seq = p->seq;
622 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
623 /* sysctl_xfrm_aevent_etime is in 100ms units */
624 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
625
626 if ((err = xfrm_init_replay(x)))
627 goto error;
628
629 /* override default values from above */
630 xfrm_update_ae_params(x, attrs, 0);
631
632 /* configure the hardware if offload is requested */
633 if (attrs[XFRMA_OFFLOAD_DEV]) {
634 err = xfrm_dev_state_add(net, x,
635 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
636 if (err)
637 goto error;
638 }
639
640 return x;
641
642 error:
643 x->km.state = XFRM_STATE_DEAD;
644 xfrm_state_put(x);
645 error_no_put:
646 *errp = err;
647 return NULL;
648 }
649
650 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
651 struct nlattr **attrs)
652 {
653 struct net *net = sock_net(skb->sk);
654 struct xfrm_usersa_info *p = nlmsg_data(nlh);
655 struct xfrm_state *x;
656 int err;
657 struct km_event c;
658
659 err = verify_newsa_info(p, attrs);
660 if (err)
661 return err;
662
663 x = xfrm_state_construct(net, p, attrs, &err);
664 if (!x)
665 return err;
666
667 xfrm_state_hold(x);
668 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
669 err = xfrm_state_add(x);
670 else
671 err = xfrm_state_update(x);
672
673 xfrm_audit_state_add(x, err ? 0 : 1, true);
674
675 if (err < 0) {
676 x->km.state = XFRM_STATE_DEAD;
677 xfrm_dev_state_delete(x);
678 __xfrm_state_put(x);
679 goto out;
680 }
681
682 if (x->km.state == XFRM_STATE_VOID)
683 x->km.state = XFRM_STATE_VALID;
684
685 c.seq = nlh->nlmsg_seq;
686 c.portid = nlh->nlmsg_pid;
687 c.event = nlh->nlmsg_type;
688
689 km_state_notify(x, &c);
690 out:
691 xfrm_state_put(x);
692 return err;
693 }
694
695 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
696 struct xfrm_usersa_id *p,
697 struct nlattr **attrs,
698 int *errp)
699 {
700 struct xfrm_state *x = NULL;
701 struct xfrm_mark m;
702 int err;
703 u32 mark = xfrm_mark_get(attrs, &m);
704
705 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
706 err = -ESRCH;
707 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
708 } else {
709 xfrm_address_t *saddr = NULL;
710
711 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
712 if (!saddr) {
713 err = -EINVAL;
714 goto out;
715 }
716
717 err = -ESRCH;
718 x = xfrm_state_lookup_byaddr(net, mark,
719 &p->daddr, saddr,
720 p->proto, p->family);
721 }
722
723 out:
724 if (!x && errp)
725 *errp = err;
726 return x;
727 }
728
729 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
730 struct nlattr **attrs)
731 {
732 struct net *net = sock_net(skb->sk);
733 struct xfrm_state *x;
734 int err = -ESRCH;
735 struct km_event c;
736 struct xfrm_usersa_id *p = nlmsg_data(nlh);
737
738 x = xfrm_user_state_lookup(net, p, attrs, &err);
739 if (x == NULL)
740 return err;
741
742 if ((err = security_xfrm_state_delete(x)) != 0)
743 goto out;
744
745 if (xfrm_state_kern(x)) {
746 err = -EPERM;
747 goto out;
748 }
749
750 err = xfrm_state_delete(x);
751
752 if (err < 0)
753 goto out;
754
755 c.seq = nlh->nlmsg_seq;
756 c.portid = nlh->nlmsg_pid;
757 c.event = nlh->nlmsg_type;
758 km_state_notify(x, &c);
759
760 out:
761 xfrm_audit_state_delete(x, err ? 0 : 1, true);
762 xfrm_state_put(x);
763 return err;
764 }
765
766 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
767 {
768 memset(p, 0, sizeof(*p));
769 memcpy(&p->id, &x->id, sizeof(p->id));
770 memcpy(&p->sel, &x->sel, sizeof(p->sel));
771 memcpy(&p->lft, &x->lft, sizeof(p->lft));
772 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
773 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
774 put_unaligned(x->stats.replay, &p->stats.replay);
775 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
776 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
777 p->mode = x->props.mode;
778 p->replay_window = x->props.replay_window;
779 p->reqid = x->props.reqid;
780 p->family = x->props.family;
781 p->flags = x->props.flags;
782 p->seq = x->km.seq;
783 }
784
785 struct xfrm_dump_info {
786 struct sk_buff *in_skb;
787 struct sk_buff *out_skb;
788 u32 nlmsg_seq;
789 u16 nlmsg_flags;
790 };
791
792 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
793 {
794 struct xfrm_user_sec_ctx *uctx;
795 struct nlattr *attr;
796 int ctx_size = sizeof(*uctx) + s->ctx_len;
797
798 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
799 if (attr == NULL)
800 return -EMSGSIZE;
801
802 uctx = nla_data(attr);
803 uctx->exttype = XFRMA_SEC_CTX;
804 uctx->len = ctx_size;
805 uctx->ctx_doi = s->ctx_doi;
806 uctx->ctx_alg = s->ctx_alg;
807 uctx->ctx_len = s->ctx_len;
808 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
809
810 return 0;
811 }
812
813 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
814 {
815 struct xfrm_user_offload *xuo;
816 struct nlattr *attr;
817
818 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
819 if (attr == NULL)
820 return -EMSGSIZE;
821
822 xuo = nla_data(attr);
823 memset(xuo, 0, sizeof(*xuo));
824 xuo->ifindex = xso->dev->ifindex;
825 xuo->flags = xso->flags;
826
827 return 0;
828 }
829
830 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
831 {
832 struct xfrm_algo *algo;
833 struct nlattr *nla;
834
835 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
836 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
837 if (!nla)
838 return -EMSGSIZE;
839
840 algo = nla_data(nla);
841 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
842 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
843 algo->alg_key_len = auth->alg_key_len;
844
845 return 0;
846 }
847
848 static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
849 {
850 int ret = 0;
851
852 if (m->v | m->m) {
853 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
854 if (!ret)
855 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
856 }
857 return ret;
858 }
859
860 /* Don't change this without updating xfrm_sa_len! */
861 static int copy_to_user_state_extra(struct xfrm_state *x,
862 struct xfrm_usersa_info *p,
863 struct sk_buff *skb)
864 {
865 int ret = 0;
866
867 copy_to_user_state(x, p);
868
869 if (x->props.extra_flags) {
870 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
871 x->props.extra_flags);
872 if (ret)
873 goto out;
874 }
875
876 if (x->coaddr) {
877 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
878 if (ret)
879 goto out;
880 }
881 if (x->lastused) {
882 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
883 XFRMA_PAD);
884 if (ret)
885 goto out;
886 }
887 if (x->aead) {
888 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
889 if (ret)
890 goto out;
891 }
892 if (x->aalg) {
893 ret = copy_to_user_auth(x->aalg, skb);
894 if (!ret)
895 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
896 xfrm_alg_auth_len(x->aalg), x->aalg);
897 if (ret)
898 goto out;
899 }
900 if (x->ealg) {
901 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
902 if (ret)
903 goto out;
904 }
905 if (x->calg) {
906 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
907 if (ret)
908 goto out;
909 }
910 if (x->encap) {
911 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
912 if (ret)
913 goto out;
914 }
915 if (x->tfcpad) {
916 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
917 if (ret)
918 goto out;
919 }
920 ret = xfrm_mark_put(skb, &x->mark);
921 if (ret)
922 goto out;
923
924 ret = xfrm_smark_put(skb, &x->props.smark);
925 if (ret)
926 goto out;
927
928 if (x->replay_esn)
929 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
930 xfrm_replay_state_esn_len(x->replay_esn),
931 x->replay_esn);
932 else
933 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
934 &x->replay);
935 if (ret)
936 goto out;
937 if(x->xso.dev)
938 ret = copy_user_offload(&x->xso, skb);
939 if (ret)
940 goto out;
941 if (x->if_id) {
942 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
943 if (ret)
944 goto out;
945 }
946 if (x->security)
947 ret = copy_sec_ctx(x->security, skb);
948 out:
949 return ret;
950 }
951
952 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
953 {
954 struct xfrm_dump_info *sp = ptr;
955 struct sk_buff *in_skb = sp->in_skb;
956 struct sk_buff *skb = sp->out_skb;
957 struct xfrm_usersa_info *p;
958 struct nlmsghdr *nlh;
959 int err;
960
961 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
962 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
963 if (nlh == NULL)
964 return -EMSGSIZE;
965
966 p = nlmsg_data(nlh);
967
968 err = copy_to_user_state_extra(x, p, skb);
969 if (err) {
970 nlmsg_cancel(skb, nlh);
971 return err;
972 }
973 nlmsg_end(skb, nlh);
974 return 0;
975 }
976
977 static int xfrm_dump_sa_done(struct netlink_callback *cb)
978 {
979 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
980 struct sock *sk = cb->skb->sk;
981 struct net *net = sock_net(sk);
982
983 if (cb->args[0])
984 xfrm_state_walk_done(walk, net);
985 return 0;
986 }
987
988 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
989 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
990 {
991 struct net *net = sock_net(skb->sk);
992 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
993 struct xfrm_dump_info info;
994
995 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
996 sizeof(cb->args) - sizeof(cb->args[0]));
997
998 info.in_skb = cb->skb;
999 info.out_skb = skb;
1000 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1001 info.nlmsg_flags = NLM_F_MULTI;
1002
1003 if (!cb->args[0]) {
1004 struct nlattr *attrs[XFRMA_MAX+1];
1005 struct xfrm_address_filter *filter = NULL;
1006 u8 proto = 0;
1007 int err;
1008
1009 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
1010 cb->extack);
1011 if (err < 0)
1012 return err;
1013
1014 if (attrs[XFRMA_ADDRESS_FILTER]) {
1015 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1016 sizeof(*filter), GFP_KERNEL);
1017 if (filter == NULL)
1018 return -ENOMEM;
1019 }
1020
1021 if (attrs[XFRMA_PROTO])
1022 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1023
1024 xfrm_state_walk_init(walk, proto, filter);
1025 cb->args[0] = 1;
1026 }
1027
1028 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1029
1030 return skb->len;
1031 }
1032
1033 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1034 struct xfrm_state *x, u32 seq)
1035 {
1036 struct xfrm_dump_info info;
1037 struct sk_buff *skb;
1038 int err;
1039
1040 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1041 if (!skb)
1042 return ERR_PTR(-ENOMEM);
1043
1044 info.in_skb = in_skb;
1045 info.out_skb = skb;
1046 info.nlmsg_seq = seq;
1047 info.nlmsg_flags = 0;
1048
1049 err = dump_one_state(x, 0, &info);
1050 if (err) {
1051 kfree_skb(skb);
1052 return ERR_PTR(err);
1053 }
1054
1055 return skb;
1056 }
1057
1058 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1059 * Must be called with RCU read lock.
1060 */
1061 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1062 u32 pid, unsigned int group)
1063 {
1064 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1065
1066 if (!nlsk) {
1067 kfree_skb(skb);
1068 return -EPIPE;
1069 }
1070
1071 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1072 }
1073
1074 static inline unsigned int xfrm_spdinfo_msgsize(void)
1075 {
1076 return NLMSG_ALIGN(4)
1077 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1078 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1079 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1080 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1081 }
1082
1083 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1084 u32 portid, u32 seq, u32 flags)
1085 {
1086 struct xfrmk_spdinfo si;
1087 struct xfrmu_spdinfo spc;
1088 struct xfrmu_spdhinfo sph;
1089 struct xfrmu_spdhthresh spt4, spt6;
1090 struct nlmsghdr *nlh;
1091 int err;
1092 u32 *f;
1093 unsigned lseq;
1094
1095 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1096 if (nlh == NULL) /* shouldn't really happen ... */
1097 return -EMSGSIZE;
1098
1099 f = nlmsg_data(nlh);
1100 *f = flags;
1101 xfrm_spd_getinfo(net, &si);
1102 spc.incnt = si.incnt;
1103 spc.outcnt = si.outcnt;
1104 spc.fwdcnt = si.fwdcnt;
1105 spc.inscnt = si.inscnt;
1106 spc.outscnt = si.outscnt;
1107 spc.fwdscnt = si.fwdscnt;
1108 sph.spdhcnt = si.spdhcnt;
1109 sph.spdhmcnt = si.spdhmcnt;
1110
1111 do {
1112 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1113
1114 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1115 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1116 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1117 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1118 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1119
1120 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1121 if (!err)
1122 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1123 if (!err)
1124 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1125 if (!err)
1126 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1127 if (err) {
1128 nlmsg_cancel(skb, nlh);
1129 return err;
1130 }
1131
1132 nlmsg_end(skb, nlh);
1133 return 0;
1134 }
1135
1136 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1137 struct nlattr **attrs)
1138 {
1139 struct net *net = sock_net(skb->sk);
1140 struct xfrmu_spdhthresh *thresh4 = NULL;
1141 struct xfrmu_spdhthresh *thresh6 = NULL;
1142
1143 /* selector prefixlen thresholds to hash policies */
1144 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1145 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1146
1147 if (nla_len(rta) < sizeof(*thresh4))
1148 return -EINVAL;
1149 thresh4 = nla_data(rta);
1150 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1151 return -EINVAL;
1152 }
1153 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1154 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1155
1156 if (nla_len(rta) < sizeof(*thresh6))
1157 return -EINVAL;
1158 thresh6 = nla_data(rta);
1159 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1160 return -EINVAL;
1161 }
1162
1163 if (thresh4 || thresh6) {
1164 write_seqlock(&net->xfrm.policy_hthresh.lock);
1165 if (thresh4) {
1166 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1167 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1168 }
1169 if (thresh6) {
1170 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1171 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1172 }
1173 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1174
1175 xfrm_policy_hash_rebuild(net);
1176 }
1177
1178 return 0;
1179 }
1180
1181 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1182 struct nlattr **attrs)
1183 {
1184 struct net *net = sock_net(skb->sk);
1185 struct sk_buff *r_skb;
1186 u32 *flags = nlmsg_data(nlh);
1187 u32 sportid = NETLINK_CB(skb).portid;
1188 u32 seq = nlh->nlmsg_seq;
1189 int err;
1190
1191 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1192 if (r_skb == NULL)
1193 return -ENOMEM;
1194
1195 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1196 BUG_ON(err < 0);
1197
1198 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1199 }
1200
1201 static inline unsigned int xfrm_sadinfo_msgsize(void)
1202 {
1203 return NLMSG_ALIGN(4)
1204 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1205 + nla_total_size(4); /* XFRMA_SAD_CNT */
1206 }
1207
1208 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1209 u32 portid, u32 seq, u32 flags)
1210 {
1211 struct xfrmk_sadinfo si;
1212 struct xfrmu_sadhinfo sh;
1213 struct nlmsghdr *nlh;
1214 int err;
1215 u32 *f;
1216
1217 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1218 if (nlh == NULL) /* shouldn't really happen ... */
1219 return -EMSGSIZE;
1220
1221 f = nlmsg_data(nlh);
1222 *f = flags;
1223 xfrm_sad_getinfo(net, &si);
1224
1225 sh.sadhmcnt = si.sadhmcnt;
1226 sh.sadhcnt = si.sadhcnt;
1227
1228 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1229 if (!err)
1230 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1231 if (err) {
1232 nlmsg_cancel(skb, nlh);
1233 return err;
1234 }
1235
1236 nlmsg_end(skb, nlh);
1237 return 0;
1238 }
1239
1240 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1241 struct nlattr **attrs)
1242 {
1243 struct net *net = sock_net(skb->sk);
1244 struct sk_buff *r_skb;
1245 u32 *flags = nlmsg_data(nlh);
1246 u32 sportid = NETLINK_CB(skb).portid;
1247 u32 seq = nlh->nlmsg_seq;
1248 int err;
1249
1250 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1251 if (r_skb == NULL)
1252 return -ENOMEM;
1253
1254 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1255 BUG_ON(err < 0);
1256
1257 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1258 }
1259
1260 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1261 struct nlattr **attrs)
1262 {
1263 struct net *net = sock_net(skb->sk);
1264 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1265 struct xfrm_state *x;
1266 struct sk_buff *resp_skb;
1267 int err = -ESRCH;
1268
1269 x = xfrm_user_state_lookup(net, p, attrs, &err);
1270 if (x == NULL)
1271 goto out_noput;
1272
1273 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1274 if (IS_ERR(resp_skb)) {
1275 err = PTR_ERR(resp_skb);
1276 } else {
1277 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1278 }
1279 xfrm_state_put(x);
1280 out_noput:
1281 return err;
1282 }
1283
1284 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1285 struct nlattr **attrs)
1286 {
1287 struct net *net = sock_net(skb->sk);
1288 struct xfrm_state *x;
1289 struct xfrm_userspi_info *p;
1290 struct sk_buff *resp_skb;
1291 xfrm_address_t *daddr;
1292 int family;
1293 int err;
1294 u32 mark;
1295 struct xfrm_mark m;
1296 u32 if_id = 0;
1297
1298 p = nlmsg_data(nlh);
1299 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1300 if (err)
1301 goto out_noput;
1302
1303 family = p->info.family;
1304 daddr = &p->info.id.daddr;
1305
1306 x = NULL;
1307
1308 mark = xfrm_mark_get(attrs, &m);
1309
1310 if (attrs[XFRMA_IF_ID])
1311 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1312
1313 if (p->info.seq) {
1314 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1315 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1316 xfrm_state_put(x);
1317 x = NULL;
1318 }
1319 }
1320
1321 if (!x)
1322 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1323 if_id, p->info.id.proto, daddr,
1324 &p->info.saddr, 1,
1325 family);
1326 err = -ENOENT;
1327 if (x == NULL)
1328 goto out_noput;
1329
1330 err = xfrm_alloc_spi(x, p->min, p->max);
1331 if (err)
1332 goto out;
1333
1334 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1335 if (IS_ERR(resp_skb)) {
1336 err = PTR_ERR(resp_skb);
1337 goto out;
1338 }
1339
1340 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1341
1342 out:
1343 xfrm_state_put(x);
1344 out_noput:
1345 return err;
1346 }
1347
1348 static int verify_policy_dir(u8 dir)
1349 {
1350 switch (dir) {
1351 case XFRM_POLICY_IN:
1352 case XFRM_POLICY_OUT:
1353 case XFRM_POLICY_FWD:
1354 break;
1355
1356 default:
1357 return -EINVAL;
1358 }
1359
1360 return 0;
1361 }
1362
1363 static int verify_policy_type(u8 type)
1364 {
1365 switch (type) {
1366 case XFRM_POLICY_TYPE_MAIN:
1367 #ifdef CONFIG_XFRM_SUB_POLICY
1368 case XFRM_POLICY_TYPE_SUB:
1369 #endif
1370 break;
1371
1372 default:
1373 return -EINVAL;
1374 }
1375
1376 return 0;
1377 }
1378
1379 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1380 {
1381 int ret;
1382
1383 switch (p->share) {
1384 case XFRM_SHARE_ANY:
1385 case XFRM_SHARE_SESSION:
1386 case XFRM_SHARE_USER:
1387 case XFRM_SHARE_UNIQUE:
1388 break;
1389
1390 default:
1391 return -EINVAL;
1392 }
1393
1394 switch (p->action) {
1395 case XFRM_POLICY_ALLOW:
1396 case XFRM_POLICY_BLOCK:
1397 break;
1398
1399 default:
1400 return -EINVAL;
1401 }
1402
1403 switch (p->sel.family) {
1404 case AF_INET:
1405 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1406 return -EINVAL;
1407
1408 break;
1409
1410 case AF_INET6:
1411 #if IS_ENABLED(CONFIG_IPV6)
1412 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1413 return -EINVAL;
1414
1415 break;
1416 #else
1417 return -EAFNOSUPPORT;
1418 #endif
1419
1420 default:
1421 return -EINVAL;
1422 }
1423
1424 ret = verify_policy_dir(p->dir);
1425 if (ret)
1426 return ret;
1427 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1428 return -EINVAL;
1429
1430 return 0;
1431 }
1432
1433 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1434 {
1435 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1436 struct xfrm_user_sec_ctx *uctx;
1437
1438 if (!rt)
1439 return 0;
1440
1441 uctx = nla_data(rt);
1442 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1443 }
1444
1445 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1446 int nr)
1447 {
1448 int i;
1449
1450 xp->xfrm_nr = nr;
1451 for (i = 0; i < nr; i++, ut++) {
1452 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1453
1454 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1455 memcpy(&t->saddr, &ut->saddr,
1456 sizeof(xfrm_address_t));
1457 t->reqid = ut->reqid;
1458 t->mode = ut->mode;
1459 t->share = ut->share;
1460 t->optional = ut->optional;
1461 t->aalgos = ut->aalgos;
1462 t->ealgos = ut->ealgos;
1463 t->calgos = ut->calgos;
1464 /* If all masks are ~0, then we allow all algorithms. */
1465 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1466 t->encap_family = ut->family;
1467 }
1468 }
1469
1470 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1471 {
1472 u16 prev_family;
1473 int i;
1474
1475 if (nr > XFRM_MAX_DEPTH)
1476 return -EINVAL;
1477
1478 prev_family = family;
1479
1480 for (i = 0; i < nr; i++) {
1481 /* We never validated the ut->family value, so many
1482 * applications simply leave it at zero. The check was
1483 * never made and ut->family was ignored because all
1484 * templates could be assumed to have the same family as
1485 * the policy itself. Now that we will have ipv4-in-ipv6
1486 * and ipv6-in-ipv4 tunnels, this is no longer true.
1487 */
1488 if (!ut[i].family)
1489 ut[i].family = family;
1490
1491 if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
1492 (ut[i].family != prev_family))
1493 return -EINVAL;
1494
1495 if (ut[i].mode >= XFRM_MODE_MAX)
1496 return -EINVAL;
1497
1498 prev_family = ut[i].family;
1499
1500 switch (ut[i].family) {
1501 case AF_INET:
1502 break;
1503 #if IS_ENABLED(CONFIG_IPV6)
1504 case AF_INET6:
1505 break;
1506 #endif
1507 default:
1508 return -EINVAL;
1509 }
1510
1511 switch (ut[i].id.proto) {
1512 case IPPROTO_AH:
1513 case IPPROTO_ESP:
1514 case IPPROTO_COMP:
1515 #if IS_ENABLED(CONFIG_IPV6)
1516 case IPPROTO_ROUTING:
1517 case IPPROTO_DSTOPTS:
1518 #endif
1519 case IPSEC_PROTO_ANY:
1520 break;
1521 default:
1522 return -EINVAL;
1523 }
1524
1525 }
1526
1527 return 0;
1528 }
1529
1530 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1531 {
1532 struct nlattr *rt = attrs[XFRMA_TMPL];
1533
1534 if (!rt) {
1535 pol->xfrm_nr = 0;
1536 } else {
1537 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1538 int nr = nla_len(rt) / sizeof(*utmpl);
1539 int err;
1540
1541 err = validate_tmpl(nr, utmpl, pol->family);
1542 if (err)
1543 return err;
1544
1545 copy_templates(pol, utmpl, nr);
1546 }
1547 return 0;
1548 }
1549
1550 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1551 {
1552 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1553 struct xfrm_userpolicy_type *upt;
1554 u8 type = XFRM_POLICY_TYPE_MAIN;
1555 int err;
1556
1557 if (rt) {
1558 upt = nla_data(rt);
1559 type = upt->type;
1560 }
1561
1562 err = verify_policy_type(type);
1563 if (err)
1564 return err;
1565
1566 *tp = type;
1567 return 0;
1568 }
1569
1570 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1571 {
1572 xp->priority = p->priority;
1573 xp->index = p->index;
1574 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1575 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1576 xp->action = p->action;
1577 xp->flags = p->flags;
1578 xp->family = p->sel.family;
1579 /* XXX xp->share = p->share; */
1580 }
1581
1582 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1583 {
1584 memset(p, 0, sizeof(*p));
1585 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1586 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1587 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1588 p->priority = xp->priority;
1589 p->index = xp->index;
1590 p->sel.family = xp->family;
1591 p->dir = dir;
1592 p->action = xp->action;
1593 p->flags = xp->flags;
1594 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1595 }
1596
1597 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1598 {
1599 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1600 int err;
1601
1602 if (!xp) {
1603 *errp = -ENOMEM;
1604 return NULL;
1605 }
1606
1607 copy_from_user_policy(xp, p);
1608
1609 err = copy_from_user_policy_type(&xp->type, attrs);
1610 if (err)
1611 goto error;
1612
1613 if (!(err = copy_from_user_tmpl(xp, attrs)))
1614 err = copy_from_user_sec_ctx(xp, attrs);
1615 if (err)
1616 goto error;
1617
1618 xfrm_mark_get(attrs, &xp->mark);
1619
1620 if (attrs[XFRMA_IF_ID])
1621 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1622
1623 return xp;
1624 error:
1625 *errp = err;
1626 xp->walk.dead = 1;
1627 xfrm_policy_destroy(xp);
1628 return NULL;
1629 }
1630
1631 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1632 struct nlattr **attrs)
1633 {
1634 struct net *net = sock_net(skb->sk);
1635 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1636 struct xfrm_policy *xp;
1637 struct km_event c;
1638 int err;
1639 int excl;
1640
1641 err = verify_newpolicy_info(p);
1642 if (err)
1643 return err;
1644 err = verify_sec_ctx_len(attrs);
1645 if (err)
1646 return err;
1647
1648 xp = xfrm_policy_construct(net, p, attrs, &err);
1649 if (!xp)
1650 return err;
1651
1652 /* shouldn't excl be based on nlh flags??
1653 * Aha! this is anti-netlink really i.e more pfkey derived
1654 * in netlink excl is a flag and you wouldnt need
1655 * a type XFRM_MSG_UPDPOLICY - JHS */
1656 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1657 err = xfrm_policy_insert(p->dir, xp, excl);
1658 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1659
1660 if (err) {
1661 security_xfrm_policy_free(xp->security);
1662 kfree(xp);
1663 return err;
1664 }
1665
1666 c.event = nlh->nlmsg_type;
1667 c.seq = nlh->nlmsg_seq;
1668 c.portid = nlh->nlmsg_pid;
1669 km_policy_notify(xp, p->dir, &c);
1670
1671 xfrm_pol_put(xp);
1672
1673 return 0;
1674 }
1675
1676 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1677 {
1678 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1679 int i;
1680
1681 if (xp->xfrm_nr == 0)
1682 return 0;
1683
1684 for (i = 0; i < xp->xfrm_nr; i++) {
1685 struct xfrm_user_tmpl *up = &vec[i];
1686 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1687
1688 memset(up, 0, sizeof(*up));
1689 memcpy(&up->id, &kp->id, sizeof(up->id));
1690 up->family = kp->encap_family;
1691 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1692 up->reqid = kp->reqid;
1693 up->mode = kp->mode;
1694 up->share = kp->share;
1695 up->optional = kp->optional;
1696 up->aalgos = kp->aalgos;
1697 up->ealgos = kp->ealgos;
1698 up->calgos = kp->calgos;
1699 }
1700
1701 return nla_put(skb, XFRMA_TMPL,
1702 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1703 }
1704
1705 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1706 {
1707 if (x->security) {
1708 return copy_sec_ctx(x->security, skb);
1709 }
1710 return 0;
1711 }
1712
1713 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1714 {
1715 if (xp->security)
1716 return copy_sec_ctx(xp->security, skb);
1717 return 0;
1718 }
1719 static inline unsigned int userpolicy_type_attrsize(void)
1720 {
1721 #ifdef CONFIG_XFRM_SUB_POLICY
1722 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1723 #else
1724 return 0;
1725 #endif
1726 }
1727
1728 #ifdef CONFIG_XFRM_SUB_POLICY
1729 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1730 {
1731 struct xfrm_userpolicy_type upt;
1732
1733 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1734 memset(&upt, 0, sizeof(upt));
1735 upt.type = type;
1736
1737 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1738 }
1739
1740 #else
1741 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1742 {
1743 return 0;
1744 }
1745 #endif
1746
1747 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1748 {
1749 struct xfrm_dump_info *sp = ptr;
1750 struct xfrm_userpolicy_info *p;
1751 struct sk_buff *in_skb = sp->in_skb;
1752 struct sk_buff *skb = sp->out_skb;
1753 struct nlmsghdr *nlh;
1754 int err;
1755
1756 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1757 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1758 if (nlh == NULL)
1759 return -EMSGSIZE;
1760
1761 p = nlmsg_data(nlh);
1762 copy_to_user_policy(xp, p, dir);
1763 err = copy_to_user_tmpl(xp, skb);
1764 if (!err)
1765 err = copy_to_user_sec_ctx(xp, skb);
1766 if (!err)
1767 err = copy_to_user_policy_type(xp->type, skb);
1768 if (!err)
1769 err = xfrm_mark_put(skb, &xp->mark);
1770 if (!err)
1771 err = xfrm_if_id_put(skb, xp->if_id);
1772 if (err) {
1773 nlmsg_cancel(skb, nlh);
1774 return err;
1775 }
1776 nlmsg_end(skb, nlh);
1777 return 0;
1778 }
1779
1780 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1781 {
1782 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1783 struct net *net = sock_net(cb->skb->sk);
1784
1785 xfrm_policy_walk_done(walk, net);
1786 return 0;
1787 }
1788
1789 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1790 {
1791 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1792
1793 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1794
1795 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1796 return 0;
1797 }
1798
1799 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1800 {
1801 struct net *net = sock_net(skb->sk);
1802 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1803 struct xfrm_dump_info info;
1804
1805 info.in_skb = cb->skb;
1806 info.out_skb = skb;
1807 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1808 info.nlmsg_flags = NLM_F_MULTI;
1809
1810 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1811
1812 return skb->len;
1813 }
1814
1815 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1816 struct xfrm_policy *xp,
1817 int dir, u32 seq)
1818 {
1819 struct xfrm_dump_info info;
1820 struct sk_buff *skb;
1821 int err;
1822
1823 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1824 if (!skb)
1825 return ERR_PTR(-ENOMEM);
1826
1827 info.in_skb = in_skb;
1828 info.out_skb = skb;
1829 info.nlmsg_seq = seq;
1830 info.nlmsg_flags = 0;
1831
1832 err = dump_one_policy(xp, dir, 0, &info);
1833 if (err) {
1834 kfree_skb(skb);
1835 return ERR_PTR(err);
1836 }
1837
1838 return skb;
1839 }
1840
1841 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1842 struct nlattr **attrs)
1843 {
1844 struct net *net = sock_net(skb->sk);
1845 struct xfrm_policy *xp;
1846 struct xfrm_userpolicy_id *p;
1847 u8 type = XFRM_POLICY_TYPE_MAIN;
1848 int err;
1849 struct km_event c;
1850 int delete;
1851 struct xfrm_mark m;
1852 u32 mark = xfrm_mark_get(attrs, &m);
1853 u32 if_id = 0;
1854
1855 p = nlmsg_data(nlh);
1856 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1857
1858 err = copy_from_user_policy_type(&type, attrs);
1859 if (err)
1860 return err;
1861
1862 err = verify_policy_dir(p->dir);
1863 if (err)
1864 return err;
1865
1866 if (attrs[XFRMA_IF_ID])
1867 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1868
1869 if (p->index)
1870 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, delete, &err);
1871 else {
1872 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1873 struct xfrm_sec_ctx *ctx;
1874
1875 err = verify_sec_ctx_len(attrs);
1876 if (err)
1877 return err;
1878
1879 ctx = NULL;
1880 if (rt) {
1881 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1882
1883 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1884 if (err)
1885 return err;
1886 }
1887 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir, &p->sel,
1888 ctx, delete, &err);
1889 security_xfrm_policy_free(ctx);
1890 }
1891 if (xp == NULL)
1892 return -ENOENT;
1893
1894 if (!delete) {
1895 struct sk_buff *resp_skb;
1896
1897 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1898 if (IS_ERR(resp_skb)) {
1899 err = PTR_ERR(resp_skb);
1900 } else {
1901 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1902 NETLINK_CB(skb).portid);
1903 }
1904 } else {
1905 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1906
1907 if (err != 0)
1908 goto out;
1909
1910 c.data.byid = p->index;
1911 c.event = nlh->nlmsg_type;
1912 c.seq = nlh->nlmsg_seq;
1913 c.portid = nlh->nlmsg_pid;
1914 km_policy_notify(xp, p->dir, &c);
1915 }
1916
1917 out:
1918 xfrm_pol_put(xp);
1919 return err;
1920 }
1921
1922 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1923 struct nlattr **attrs)
1924 {
1925 struct net *net = sock_net(skb->sk);
1926 struct km_event c;
1927 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1928 int err;
1929
1930 err = xfrm_state_flush(net, p->proto, true);
1931 if (err) {
1932 if (err == -ESRCH) /* empty table */
1933 return 0;
1934 return err;
1935 }
1936 c.data.proto = p->proto;
1937 c.event = nlh->nlmsg_type;
1938 c.seq = nlh->nlmsg_seq;
1939 c.portid = nlh->nlmsg_pid;
1940 c.net = net;
1941 km_state_notify(NULL, &c);
1942
1943 return 0;
1944 }
1945
1946 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1947 {
1948 unsigned int replay_size = x->replay_esn ?
1949 xfrm_replay_state_esn_len(x->replay_esn) :
1950 sizeof(struct xfrm_replay_state);
1951
1952 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1953 + nla_total_size(replay_size)
1954 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1955 + nla_total_size(sizeof(struct xfrm_mark))
1956 + nla_total_size(4) /* XFRM_AE_RTHR */
1957 + nla_total_size(4); /* XFRM_AE_ETHR */
1958 }
1959
1960 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1961 {
1962 struct xfrm_aevent_id *id;
1963 struct nlmsghdr *nlh;
1964 int err;
1965
1966 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1967 if (nlh == NULL)
1968 return -EMSGSIZE;
1969
1970 id = nlmsg_data(nlh);
1971 memset(&id->sa_id, 0, sizeof(id->sa_id));
1972 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1973 id->sa_id.spi = x->id.spi;
1974 id->sa_id.family = x->props.family;
1975 id->sa_id.proto = x->id.proto;
1976 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1977 id->reqid = x->props.reqid;
1978 id->flags = c->data.aevent;
1979
1980 if (x->replay_esn) {
1981 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1982 xfrm_replay_state_esn_len(x->replay_esn),
1983 x->replay_esn);
1984 } else {
1985 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1986 &x->replay);
1987 }
1988 if (err)
1989 goto out_cancel;
1990 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1991 XFRMA_PAD);
1992 if (err)
1993 goto out_cancel;
1994
1995 if (id->flags & XFRM_AE_RTHR) {
1996 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1997 if (err)
1998 goto out_cancel;
1999 }
2000 if (id->flags & XFRM_AE_ETHR) {
2001 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2002 x->replay_maxage * 10 / HZ);
2003 if (err)
2004 goto out_cancel;
2005 }
2006 err = xfrm_mark_put(skb, &x->mark);
2007 if (err)
2008 goto out_cancel;
2009
2010 err = xfrm_if_id_put(skb, x->if_id);
2011 if (err)
2012 goto out_cancel;
2013
2014 nlmsg_end(skb, nlh);
2015 return 0;
2016
2017 out_cancel:
2018 nlmsg_cancel(skb, nlh);
2019 return err;
2020 }
2021
2022 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2023 struct nlattr **attrs)
2024 {
2025 struct net *net = sock_net(skb->sk);
2026 struct xfrm_state *x;
2027 struct sk_buff *r_skb;
2028 int err;
2029 struct km_event c;
2030 u32 mark;
2031 struct xfrm_mark m;
2032 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2033 struct xfrm_usersa_id *id = &p->sa_id;
2034
2035 mark = xfrm_mark_get(attrs, &m);
2036
2037 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2038 if (x == NULL)
2039 return -ESRCH;
2040
2041 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2042 if (r_skb == NULL) {
2043 xfrm_state_put(x);
2044 return -ENOMEM;
2045 }
2046
2047 /*
2048 * XXX: is this lock really needed - none of the other
2049 * gets lock (the concern is things getting updated
2050 * while we are still reading) - jhs
2051 */
2052 spin_lock_bh(&x->lock);
2053 c.data.aevent = p->flags;
2054 c.seq = nlh->nlmsg_seq;
2055 c.portid = nlh->nlmsg_pid;
2056
2057 err = build_aevent(r_skb, x, &c);
2058 BUG_ON(err < 0);
2059
2060 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2061 spin_unlock_bh(&x->lock);
2062 xfrm_state_put(x);
2063 return err;
2064 }
2065
2066 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2067 struct nlattr **attrs)
2068 {
2069 struct net *net = sock_net(skb->sk);
2070 struct xfrm_state *x;
2071 struct km_event c;
2072 int err = -EINVAL;
2073 u32 mark = 0;
2074 struct xfrm_mark m;
2075 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2076 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2077 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2078 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2079 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2080 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2081
2082 if (!lt && !rp && !re && !et && !rt)
2083 return err;
2084
2085 /* pedantic mode - thou shalt sayeth replaceth */
2086 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2087 return err;
2088
2089 mark = xfrm_mark_get(attrs, &m);
2090
2091 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2092 if (x == NULL)
2093 return -ESRCH;
2094
2095 if (x->km.state != XFRM_STATE_VALID)
2096 goto out;
2097
2098 err = xfrm_replay_verify_len(x->replay_esn, re);
2099 if (err)
2100 goto out;
2101
2102 spin_lock_bh(&x->lock);
2103 xfrm_update_ae_params(x, attrs, 1);
2104 spin_unlock_bh(&x->lock);
2105
2106 c.event = nlh->nlmsg_type;
2107 c.seq = nlh->nlmsg_seq;
2108 c.portid = nlh->nlmsg_pid;
2109 c.data.aevent = XFRM_AE_CU;
2110 km_state_notify(x, &c);
2111 err = 0;
2112 out:
2113 xfrm_state_put(x);
2114 return err;
2115 }
2116
2117 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2118 struct nlattr **attrs)
2119 {
2120 struct net *net = sock_net(skb->sk);
2121 struct km_event c;
2122 u8 type = XFRM_POLICY_TYPE_MAIN;
2123 int err;
2124
2125 err = copy_from_user_policy_type(&type, attrs);
2126 if (err)
2127 return err;
2128
2129 err = xfrm_policy_flush(net, type, true);
2130 if (err) {
2131 if (err == -ESRCH) /* empty table */
2132 return 0;
2133 return err;
2134 }
2135
2136 c.data.type = type;
2137 c.event = nlh->nlmsg_type;
2138 c.seq = nlh->nlmsg_seq;
2139 c.portid = nlh->nlmsg_pid;
2140 c.net = net;
2141 km_policy_notify(NULL, 0, &c);
2142 return 0;
2143 }
2144
2145 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2146 struct nlattr **attrs)
2147 {
2148 struct net *net = sock_net(skb->sk);
2149 struct xfrm_policy *xp;
2150 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2151 struct xfrm_userpolicy_info *p = &up->pol;
2152 u8 type = XFRM_POLICY_TYPE_MAIN;
2153 int err = -ENOENT;
2154 struct xfrm_mark m;
2155 u32 mark = xfrm_mark_get(attrs, &m);
2156 u32 if_id = 0;
2157
2158 err = copy_from_user_policy_type(&type, attrs);
2159 if (err)
2160 return err;
2161
2162 err = verify_policy_dir(p->dir);
2163 if (err)
2164 return err;
2165
2166 if (attrs[XFRMA_IF_ID])
2167 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2168
2169 if (p->index)
2170 xp = xfrm_policy_byid(net, mark, if_id, type, p->dir, p->index, 0, &err);
2171 else {
2172 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2173 struct xfrm_sec_ctx *ctx;
2174
2175 err = verify_sec_ctx_len(attrs);
2176 if (err)
2177 return err;
2178
2179 ctx = NULL;
2180 if (rt) {
2181 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2182
2183 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2184 if (err)
2185 return err;
2186 }
2187 xp = xfrm_policy_bysel_ctx(net, mark, if_id, type, p->dir,
2188 &p->sel, ctx, 0, &err);
2189 security_xfrm_policy_free(ctx);
2190 }
2191 if (xp == NULL)
2192 return -ENOENT;
2193
2194 if (unlikely(xp->walk.dead))
2195 goto out;
2196
2197 err = 0;
2198 if (up->hard) {
2199 xfrm_policy_delete(xp, p->dir);
2200 xfrm_audit_policy_delete(xp, 1, true);
2201 }
2202 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2203
2204 out:
2205 xfrm_pol_put(xp);
2206 return err;
2207 }
2208
2209 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2210 struct nlattr **attrs)
2211 {
2212 struct net *net = sock_net(skb->sk);
2213 struct xfrm_state *x;
2214 int err;
2215 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2216 struct xfrm_usersa_info *p = &ue->state;
2217 struct xfrm_mark m;
2218 u32 mark = xfrm_mark_get(attrs, &m);
2219
2220 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2221
2222 err = -ENOENT;
2223 if (x == NULL)
2224 return err;
2225
2226 spin_lock_bh(&x->lock);
2227 err = -EINVAL;
2228 if (x->km.state != XFRM_STATE_VALID)
2229 goto out;
2230 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2231
2232 if (ue->hard) {
2233 __xfrm_state_delete(x);
2234 xfrm_audit_state_delete(x, 1, true);
2235 }
2236 err = 0;
2237 out:
2238 spin_unlock_bh(&x->lock);
2239 xfrm_state_put(x);
2240 return err;
2241 }
2242
2243 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2244 struct nlattr **attrs)
2245 {
2246 struct net *net = sock_net(skb->sk);
2247 struct xfrm_policy *xp;
2248 struct xfrm_user_tmpl *ut;
2249 int i;
2250 struct nlattr *rt = attrs[XFRMA_TMPL];
2251 struct xfrm_mark mark;
2252
2253 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2254 struct xfrm_state *x = xfrm_state_alloc(net);
2255 int err = -ENOMEM;
2256
2257 if (!x)
2258 goto nomem;
2259
2260 xfrm_mark_get(attrs, &mark);
2261
2262 err = verify_newpolicy_info(&ua->policy);
2263 if (err)
2264 goto free_state;
2265
2266 /* build an XP */
2267 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2268 if (!xp)
2269 goto free_state;
2270
2271 memcpy(&x->id, &ua->id, sizeof(ua->id));
2272 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2273 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2274 xp->mark.m = x->mark.m = mark.m;
2275 xp->mark.v = x->mark.v = mark.v;
2276 ut = nla_data(rt);
2277 /* extract the templates and for each call km_key */
2278 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2279 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2280 memcpy(&x->id, &t->id, sizeof(x->id));
2281 x->props.mode = t->mode;
2282 x->props.reqid = t->reqid;
2283 x->props.family = ut->family;
2284 t->aalgos = ua->aalgos;
2285 t->ealgos = ua->ealgos;
2286 t->calgos = ua->calgos;
2287 err = km_query(x, t, xp);
2288
2289 }
2290
2291 kfree(x);
2292 kfree(xp);
2293
2294 return 0;
2295
2296 free_state:
2297 kfree(x);
2298 nomem:
2299 return err;
2300 }
2301
2302 #ifdef CONFIG_XFRM_MIGRATE
2303 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2304 struct xfrm_kmaddress *k,
2305 struct nlattr **attrs, int *num)
2306 {
2307 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2308 struct xfrm_user_migrate *um;
2309 int i, num_migrate;
2310
2311 if (k != NULL) {
2312 struct xfrm_user_kmaddress *uk;
2313
2314 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2315 memcpy(&k->local, &uk->local, sizeof(k->local));
2316 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2317 k->family = uk->family;
2318 k->reserved = uk->reserved;
2319 }
2320
2321 um = nla_data(rt);
2322 num_migrate = nla_len(rt) / sizeof(*um);
2323
2324 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2325 return -EINVAL;
2326
2327 for (i = 0; i < num_migrate; i++, um++, ma++) {
2328 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2329 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2330 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2331 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2332
2333 ma->proto = um->proto;
2334 ma->mode = um->mode;
2335 ma->reqid = um->reqid;
2336
2337 ma->old_family = um->old_family;
2338 ma->new_family = um->new_family;
2339 }
2340
2341 *num = i;
2342 return 0;
2343 }
2344
2345 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2346 struct nlattr **attrs)
2347 {
2348 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2349 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2350 struct xfrm_kmaddress km, *kmp;
2351 u8 type;
2352 int err;
2353 int n = 0;
2354 struct net *net = sock_net(skb->sk);
2355 struct xfrm_encap_tmpl *encap = NULL;
2356
2357 if (attrs[XFRMA_MIGRATE] == NULL)
2358 return -EINVAL;
2359
2360 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2361
2362 err = copy_from_user_policy_type(&type, attrs);
2363 if (err)
2364 return err;
2365
2366 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2367 if (err)
2368 return err;
2369
2370 if (!n)
2371 return 0;
2372
2373 if (attrs[XFRMA_ENCAP]) {
2374 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2375 sizeof(*encap), GFP_KERNEL);
2376 if (!encap)
2377 return 0;
2378 }
2379
2380 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2381
2382 kfree(encap);
2383
2384 return err;
2385 }
2386 #else
2387 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2388 struct nlattr **attrs)
2389 {
2390 return -ENOPROTOOPT;
2391 }
2392 #endif
2393
2394 #ifdef CONFIG_XFRM_MIGRATE
2395 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2396 {
2397 struct xfrm_user_migrate um;
2398
2399 memset(&um, 0, sizeof(um));
2400 um.proto = m->proto;
2401 um.mode = m->mode;
2402 um.reqid = m->reqid;
2403 um.old_family = m->old_family;
2404 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2405 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2406 um.new_family = m->new_family;
2407 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2408 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2409
2410 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2411 }
2412
2413 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2414 {
2415 struct xfrm_user_kmaddress uk;
2416
2417 memset(&uk, 0, sizeof(uk));
2418 uk.family = k->family;
2419 uk.reserved = k->reserved;
2420 memcpy(&uk.local, &k->local, sizeof(uk.local));
2421 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2422
2423 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2424 }
2425
2426 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2427 int with_encp)
2428 {
2429 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2430 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2431 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2432 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2433 + userpolicy_type_attrsize();
2434 }
2435
2436 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2437 int num_migrate, const struct xfrm_kmaddress *k,
2438 const struct xfrm_selector *sel,
2439 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2440 {
2441 const struct xfrm_migrate *mp;
2442 struct xfrm_userpolicy_id *pol_id;
2443 struct nlmsghdr *nlh;
2444 int i, err;
2445
2446 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2447 if (nlh == NULL)
2448 return -EMSGSIZE;
2449
2450 pol_id = nlmsg_data(nlh);
2451 /* copy data from selector, dir, and type to the pol_id */
2452 memset(pol_id, 0, sizeof(*pol_id));
2453 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2454 pol_id->dir = dir;
2455
2456 if (k != NULL) {
2457 err = copy_to_user_kmaddress(k, skb);
2458 if (err)
2459 goto out_cancel;
2460 }
2461 if (encap) {
2462 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2463 if (err)
2464 goto out_cancel;
2465 }
2466 err = copy_to_user_policy_type(type, skb);
2467 if (err)
2468 goto out_cancel;
2469 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2470 err = copy_to_user_migrate(mp, skb);
2471 if (err)
2472 goto out_cancel;
2473 }
2474
2475 nlmsg_end(skb, nlh);
2476 return 0;
2477
2478 out_cancel:
2479 nlmsg_cancel(skb, nlh);
2480 return err;
2481 }
2482
2483 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2484 const struct xfrm_migrate *m, int num_migrate,
2485 const struct xfrm_kmaddress *k,
2486 const struct xfrm_encap_tmpl *encap)
2487 {
2488 struct net *net = &init_net;
2489 struct sk_buff *skb;
2490 int err;
2491
2492 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2493 GFP_ATOMIC);
2494 if (skb == NULL)
2495 return -ENOMEM;
2496
2497 /* build migrate */
2498 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2499 BUG_ON(err < 0);
2500
2501 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2502 }
2503 #else
2504 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2505 const struct xfrm_migrate *m, int num_migrate,
2506 const struct xfrm_kmaddress *k,
2507 const struct xfrm_encap_tmpl *encap)
2508 {
2509 return -ENOPROTOOPT;
2510 }
2511 #endif
2512
2513 #define XMSGSIZE(type) sizeof(struct type)
2514
2515 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2516 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2517 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2518 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2519 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2520 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2521 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2522 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2523 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2524 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2525 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2526 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2527 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2528 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2529 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2530 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2531 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2532 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2533 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2534 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2535 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2536 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2537 };
2538
2539 #undef XMSGSIZE
2540
2541 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2542 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2543 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2544 [XFRMA_LASTUSED] = { .type = NLA_U64},
2545 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2546 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2547 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2548 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2549 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2550 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2551 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2552 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2553 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2554 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2555 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2556 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2557 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2558 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2559 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2560 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2561 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2562 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2563 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2564 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2565 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2566 [XFRMA_PROTO] = { .type = NLA_U8 },
2567 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2568 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2569 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2570 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2571 [XFRMA_IF_ID] = { .type = NLA_U32 },
2572 };
2573
2574 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2575 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2576 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2577 };
2578
2579 static const struct xfrm_link {
2580 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2581 int (*start)(struct netlink_callback *);
2582 int (*dump)(struct sk_buff *, struct netlink_callback *);
2583 int (*done)(struct netlink_callback *);
2584 const struct nla_policy *nla_pol;
2585 int nla_max;
2586 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2587 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2588 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2589 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2590 .dump = xfrm_dump_sa,
2591 .done = xfrm_dump_sa_done },
2592 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2593 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2594 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2595 .start = xfrm_dump_policy_start,
2596 .dump = xfrm_dump_policy,
2597 .done = xfrm_dump_policy_done },
2598 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2599 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2600 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2601 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2602 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2603 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2604 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2605 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2606 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2607 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2608 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2609 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2610 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2611 .nla_pol = xfrma_spd_policy,
2612 .nla_max = XFRMA_SPD_MAX },
2613 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2614 };
2615
2616 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2617 struct netlink_ext_ack *extack)
2618 {
2619 struct net *net = sock_net(skb->sk);
2620 struct nlattr *attrs[XFRMA_MAX+1];
2621 const struct xfrm_link *link;
2622 int type, err;
2623
2624 #ifdef CONFIG_COMPAT
2625 if (in_compat_syscall())
2626 return -EOPNOTSUPP;
2627 #endif
2628
2629 type = nlh->nlmsg_type;
2630 if (type > XFRM_MSG_MAX)
2631 return -EINVAL;
2632
2633 type -= XFRM_MSG_BASE;
2634 link = &xfrm_dispatch[type];
2635
2636 /* All operations require privileges, even GET */
2637 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2638 return -EPERM;
2639
2640 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2641 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2642 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2643 if (link->dump == NULL)
2644 return -EINVAL;
2645
2646 {
2647 struct netlink_dump_control c = {
2648 .start = link->start,
2649 .dump = link->dump,
2650 .done = link->done,
2651 };
2652 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2653 }
2654 }
2655
2656 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2657 link->nla_max ? : XFRMA_MAX,
2658 link->nla_pol ? : xfrma_policy, extack);
2659 if (err < 0)
2660 return err;
2661
2662 if (link->doit == NULL)
2663 return -EINVAL;
2664
2665 return link->doit(skb, nlh, attrs);
2666 }
2667
2668 static void xfrm_netlink_rcv(struct sk_buff *skb)
2669 {
2670 struct net *net = sock_net(skb->sk);
2671
2672 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2673 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2674 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2675 }
2676
2677 static inline unsigned int xfrm_expire_msgsize(void)
2678 {
2679 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2680 + nla_total_size(sizeof(struct xfrm_mark));
2681 }
2682
2683 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2684 {
2685 struct xfrm_user_expire *ue;
2686 struct nlmsghdr *nlh;
2687 int err;
2688
2689 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2690 if (nlh == NULL)
2691 return -EMSGSIZE;
2692
2693 ue = nlmsg_data(nlh);
2694 copy_to_user_state(x, &ue->state);
2695 ue->hard = (c->data.hard != 0) ? 1 : 0;
2696 /* clear the padding bytes */
2697 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2698
2699 err = xfrm_mark_put(skb, &x->mark);
2700 if (err)
2701 return err;
2702
2703 err = xfrm_if_id_put(skb, x->if_id);
2704 if (err)
2705 return err;
2706
2707 nlmsg_end(skb, nlh);
2708 return 0;
2709 }
2710
2711 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2712 {
2713 struct net *net = xs_net(x);
2714 struct sk_buff *skb;
2715
2716 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2717 if (skb == NULL)
2718 return -ENOMEM;
2719
2720 if (build_expire(skb, x, c) < 0) {
2721 kfree_skb(skb);
2722 return -EMSGSIZE;
2723 }
2724
2725 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2726 }
2727
2728 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2729 {
2730 struct net *net = xs_net(x);
2731 struct sk_buff *skb;
2732 int err;
2733
2734 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2735 if (skb == NULL)
2736 return -ENOMEM;
2737
2738 err = build_aevent(skb, x, c);
2739 BUG_ON(err < 0);
2740
2741 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2742 }
2743
2744 static int xfrm_notify_sa_flush(const struct km_event *c)
2745 {
2746 struct net *net = c->net;
2747 struct xfrm_usersa_flush *p;
2748 struct nlmsghdr *nlh;
2749 struct sk_buff *skb;
2750 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2751
2752 skb = nlmsg_new(len, GFP_ATOMIC);
2753 if (skb == NULL)
2754 return -ENOMEM;
2755
2756 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2757 if (nlh == NULL) {
2758 kfree_skb(skb);
2759 return -EMSGSIZE;
2760 }
2761
2762 p = nlmsg_data(nlh);
2763 p->proto = c->data.proto;
2764
2765 nlmsg_end(skb, nlh);
2766
2767 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2768 }
2769
2770 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2771 {
2772 unsigned int l = 0;
2773 if (x->aead)
2774 l += nla_total_size(aead_len(x->aead));
2775 if (x->aalg) {
2776 l += nla_total_size(sizeof(struct xfrm_algo) +
2777 (x->aalg->alg_key_len + 7) / 8);
2778 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2779 }
2780 if (x->ealg)
2781 l += nla_total_size(xfrm_alg_len(x->ealg));
2782 if (x->calg)
2783 l += nla_total_size(sizeof(*x->calg));
2784 if (x->encap)
2785 l += nla_total_size(sizeof(*x->encap));
2786 if (x->tfcpad)
2787 l += nla_total_size(sizeof(x->tfcpad));
2788 if (x->replay_esn)
2789 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2790 else
2791 l += nla_total_size(sizeof(struct xfrm_replay_state));
2792 if (x->security)
2793 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2794 x->security->ctx_len);
2795 if (x->coaddr)
2796 l += nla_total_size(sizeof(*x->coaddr));
2797 if (x->props.extra_flags)
2798 l += nla_total_size(sizeof(x->props.extra_flags));
2799 if (x->xso.dev)
2800 l += nla_total_size(sizeof(x->xso));
2801 if (x->props.smark.v | x->props.smark.m) {
2802 l += nla_total_size(sizeof(x->props.smark.v));
2803 l += nla_total_size(sizeof(x->props.smark.m));
2804 }
2805 if (x->if_id)
2806 l += nla_total_size(sizeof(x->if_id));
2807
2808 /* Must count x->lastused as it may become non-zero behind our back. */
2809 l += nla_total_size_64bit(sizeof(u64));
2810
2811 return l;
2812 }
2813
2814 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2815 {
2816 struct net *net = xs_net(x);
2817 struct xfrm_usersa_info *p;
2818 struct xfrm_usersa_id *id;
2819 struct nlmsghdr *nlh;
2820 struct sk_buff *skb;
2821 unsigned int len = xfrm_sa_len(x);
2822 unsigned int headlen;
2823 int err;
2824
2825 headlen = sizeof(*p);
2826 if (c->event == XFRM_MSG_DELSA) {
2827 len += nla_total_size(headlen);
2828 headlen = sizeof(*id);
2829 len += nla_total_size(sizeof(struct xfrm_mark));
2830 }
2831 len += NLMSG_ALIGN(headlen);
2832
2833 skb = nlmsg_new(len, GFP_ATOMIC);
2834 if (skb == NULL)
2835 return -ENOMEM;
2836
2837 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2838 err = -EMSGSIZE;
2839 if (nlh == NULL)
2840 goto out_free_skb;
2841
2842 p = nlmsg_data(nlh);
2843 if (c->event == XFRM_MSG_DELSA) {
2844 struct nlattr *attr;
2845
2846 id = nlmsg_data(nlh);
2847 memset(id, 0, sizeof(*id));
2848 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2849 id->spi = x->id.spi;
2850 id->family = x->props.family;
2851 id->proto = x->id.proto;
2852
2853 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2854 err = -EMSGSIZE;
2855 if (attr == NULL)
2856 goto out_free_skb;
2857
2858 p = nla_data(attr);
2859 }
2860 err = copy_to_user_state_extra(x, p, skb);
2861 if (err)
2862 goto out_free_skb;
2863
2864 nlmsg_end(skb, nlh);
2865
2866 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2867
2868 out_free_skb:
2869 kfree_skb(skb);
2870 return err;
2871 }
2872
2873 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2874 {
2875
2876 switch (c->event) {
2877 case XFRM_MSG_EXPIRE:
2878 return xfrm_exp_state_notify(x, c);
2879 case XFRM_MSG_NEWAE:
2880 return xfrm_aevent_state_notify(x, c);
2881 case XFRM_MSG_DELSA:
2882 case XFRM_MSG_UPDSA:
2883 case XFRM_MSG_NEWSA:
2884 return xfrm_notify_sa(x, c);
2885 case XFRM_MSG_FLUSHSA:
2886 return xfrm_notify_sa_flush(c);
2887 default:
2888 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2889 c->event);
2890 break;
2891 }
2892
2893 return 0;
2894
2895 }
2896
2897 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2898 struct xfrm_policy *xp)
2899 {
2900 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2901 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2902 + nla_total_size(sizeof(struct xfrm_mark))
2903 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2904 + userpolicy_type_attrsize();
2905 }
2906
2907 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2908 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2909 {
2910 __u32 seq = xfrm_get_acqseq();
2911 struct xfrm_user_acquire *ua;
2912 struct nlmsghdr *nlh;
2913 int err;
2914
2915 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2916 if (nlh == NULL)
2917 return -EMSGSIZE;
2918
2919 ua = nlmsg_data(nlh);
2920 memcpy(&ua->id, &x->id, sizeof(ua->id));
2921 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2922 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2923 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2924 ua->aalgos = xt->aalgos;
2925 ua->ealgos = xt->ealgos;
2926 ua->calgos = xt->calgos;
2927 ua->seq = x->km.seq = seq;
2928
2929 err = copy_to_user_tmpl(xp, skb);
2930 if (!err)
2931 err = copy_to_user_state_sec_ctx(x, skb);
2932 if (!err)
2933 err = copy_to_user_policy_type(xp->type, skb);
2934 if (!err)
2935 err = xfrm_mark_put(skb, &xp->mark);
2936 if (!err)
2937 err = xfrm_if_id_put(skb, xp->if_id);
2938 if (err) {
2939 nlmsg_cancel(skb, nlh);
2940 return err;
2941 }
2942
2943 nlmsg_end(skb, nlh);
2944 return 0;
2945 }
2946
2947 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2948 struct xfrm_policy *xp)
2949 {
2950 struct net *net = xs_net(x);
2951 struct sk_buff *skb;
2952 int err;
2953
2954 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2955 if (skb == NULL)
2956 return -ENOMEM;
2957
2958 err = build_acquire(skb, x, xt, xp);
2959 BUG_ON(err < 0);
2960
2961 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2962 }
2963
2964 /* User gives us xfrm_user_policy_info followed by an array of 0
2965 * or more templates.
2966 */
2967 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2968 u8 *data, int len, int *dir)
2969 {
2970 struct net *net = sock_net(sk);
2971 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2972 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2973 struct xfrm_policy *xp;
2974 int nr;
2975
2976 switch (sk->sk_family) {
2977 case AF_INET:
2978 if (opt != IP_XFRM_POLICY) {
2979 *dir = -EOPNOTSUPP;
2980 return NULL;
2981 }
2982 break;
2983 #if IS_ENABLED(CONFIG_IPV6)
2984 case AF_INET6:
2985 if (opt != IPV6_XFRM_POLICY) {
2986 *dir = -EOPNOTSUPP;
2987 return NULL;
2988 }
2989 break;
2990 #endif
2991 default:
2992 *dir = -EINVAL;
2993 return NULL;
2994 }
2995
2996 *dir = -EINVAL;
2997
2998 if (len < sizeof(*p) ||
2999 verify_newpolicy_info(p))
3000 return NULL;
3001
3002 nr = ((len - sizeof(*p)) / sizeof(*ut));
3003 if (validate_tmpl(nr, ut, p->sel.family))
3004 return NULL;
3005
3006 if (p->dir > XFRM_POLICY_OUT)
3007 return NULL;
3008
3009 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3010 if (xp == NULL) {
3011 *dir = -ENOBUFS;
3012 return NULL;
3013 }
3014
3015 copy_from_user_policy(xp, p);
3016 xp->type = XFRM_POLICY_TYPE_MAIN;
3017 copy_templates(xp, ut, nr);
3018
3019 *dir = p->dir;
3020
3021 return xp;
3022 }
3023
3024 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3025 {
3026 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3027 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3028 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3029 + nla_total_size(sizeof(struct xfrm_mark))
3030 + userpolicy_type_attrsize();
3031 }
3032
3033 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3034 int dir, const struct km_event *c)
3035 {
3036 struct xfrm_user_polexpire *upe;
3037 int hard = c->data.hard;
3038 struct nlmsghdr *nlh;
3039 int err;
3040
3041 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3042 if (nlh == NULL)
3043 return -EMSGSIZE;
3044
3045 upe = nlmsg_data(nlh);
3046 copy_to_user_policy(xp, &upe->pol, dir);
3047 err = copy_to_user_tmpl(xp, skb);
3048 if (!err)
3049 err = copy_to_user_sec_ctx(xp, skb);
3050 if (!err)
3051 err = copy_to_user_policy_type(xp->type, skb);
3052 if (!err)
3053 err = xfrm_mark_put(skb, &xp->mark);
3054 if (!err)
3055 err = xfrm_if_id_put(skb, xp->if_id);
3056 if (err) {
3057 nlmsg_cancel(skb, nlh);
3058 return err;
3059 }
3060 upe->hard = !!hard;
3061
3062 nlmsg_end(skb, nlh);
3063 return 0;
3064 }
3065
3066 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3067 {
3068 struct net *net = xp_net(xp);
3069 struct sk_buff *skb;
3070 int err;
3071
3072 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3073 if (skb == NULL)
3074 return -ENOMEM;
3075
3076 err = build_polexpire(skb, xp, dir, c);
3077 BUG_ON(err < 0);
3078
3079 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3080 }
3081
3082 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3083 {
3084 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3085 struct net *net = xp_net(xp);
3086 struct xfrm_userpolicy_info *p;
3087 struct xfrm_userpolicy_id *id;
3088 struct nlmsghdr *nlh;
3089 struct sk_buff *skb;
3090 unsigned int headlen;
3091 int err;
3092
3093 headlen = sizeof(*p);
3094 if (c->event == XFRM_MSG_DELPOLICY) {
3095 len += nla_total_size(headlen);
3096 headlen = sizeof(*id);
3097 }
3098 len += userpolicy_type_attrsize();
3099 len += nla_total_size(sizeof(struct xfrm_mark));
3100 len += NLMSG_ALIGN(headlen);
3101
3102 skb = nlmsg_new(len, GFP_ATOMIC);
3103 if (skb == NULL)
3104 return -ENOMEM;
3105
3106 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3107 err = -EMSGSIZE;
3108 if (nlh == NULL)
3109 goto out_free_skb;
3110
3111 p = nlmsg_data(nlh);
3112 if (c->event == XFRM_MSG_DELPOLICY) {
3113 struct nlattr *attr;
3114
3115 id = nlmsg_data(nlh);
3116 memset(id, 0, sizeof(*id));
3117 id->dir = dir;
3118 if (c->data.byid)
3119 id->index = xp->index;
3120 else
3121 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3122
3123 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3124 err = -EMSGSIZE;
3125 if (attr == NULL)
3126 goto out_free_skb;
3127
3128 p = nla_data(attr);
3129 }
3130
3131 copy_to_user_policy(xp, p, dir);
3132 err = copy_to_user_tmpl(xp, skb);
3133 if (!err)
3134 err = copy_to_user_policy_type(xp->type, skb);
3135 if (!err)
3136 err = xfrm_mark_put(skb, &xp->mark);
3137 if (!err)
3138 err = xfrm_if_id_put(skb, xp->if_id);
3139 if (err)
3140 goto out_free_skb;
3141
3142 nlmsg_end(skb, nlh);
3143
3144 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3145
3146 out_free_skb:
3147 kfree_skb(skb);
3148 return err;
3149 }
3150
3151 static int xfrm_notify_policy_flush(const struct km_event *c)
3152 {
3153 struct net *net = c->net;
3154 struct nlmsghdr *nlh;
3155 struct sk_buff *skb;
3156 int err;
3157
3158 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3159 if (skb == NULL)
3160 return -ENOMEM;
3161
3162 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3163 err = -EMSGSIZE;
3164 if (nlh == NULL)
3165 goto out_free_skb;
3166 err = copy_to_user_policy_type(c->data.type, skb);
3167 if (err)
3168 goto out_free_skb;
3169
3170 nlmsg_end(skb, nlh);
3171
3172 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3173
3174 out_free_skb:
3175 kfree_skb(skb);
3176 return err;
3177 }
3178
3179 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3180 {
3181
3182 switch (c->event) {
3183 case XFRM_MSG_NEWPOLICY:
3184 case XFRM_MSG_UPDPOLICY:
3185 case XFRM_MSG_DELPOLICY:
3186 return xfrm_notify_policy(xp, dir, c);
3187 case XFRM_MSG_FLUSHPOLICY:
3188 return xfrm_notify_policy_flush(c);
3189 case XFRM_MSG_POLEXPIRE:
3190 return xfrm_exp_policy_notify(xp, dir, c);
3191 default:
3192 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3193 c->event);
3194 }
3195
3196 return 0;
3197
3198 }
3199
3200 static inline unsigned int xfrm_report_msgsize(void)
3201 {
3202 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3203 }
3204
3205 static int build_report(struct sk_buff *skb, u8 proto,
3206 struct xfrm_selector *sel, xfrm_address_t *addr)
3207 {
3208 struct xfrm_user_report *ur;
3209 struct nlmsghdr *nlh;
3210
3211 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3212 if (nlh == NULL)
3213 return -EMSGSIZE;
3214
3215 ur = nlmsg_data(nlh);
3216 ur->proto = proto;
3217 memcpy(&ur->sel, sel, sizeof(ur->sel));
3218
3219 if (addr) {
3220 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3221 if (err) {
3222 nlmsg_cancel(skb, nlh);
3223 return err;
3224 }
3225 }
3226 nlmsg_end(skb, nlh);
3227 return 0;
3228 }
3229
3230 static int xfrm_send_report(struct net *net, u8 proto,
3231 struct xfrm_selector *sel, xfrm_address_t *addr)
3232 {
3233 struct sk_buff *skb;
3234 int err;
3235
3236 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3237 if (skb == NULL)
3238 return -ENOMEM;
3239
3240 err = build_report(skb, proto, sel, addr);
3241 BUG_ON(err < 0);
3242
3243 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3244 }
3245
3246 static inline unsigned int xfrm_mapping_msgsize(void)
3247 {
3248 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3249 }
3250
3251 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3252 xfrm_address_t *new_saddr, __be16 new_sport)
3253 {
3254 struct xfrm_user_mapping *um;
3255 struct nlmsghdr *nlh;
3256
3257 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3258 if (nlh == NULL)
3259 return -EMSGSIZE;
3260
3261 um = nlmsg_data(nlh);
3262
3263 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3264 um->id.spi = x->id.spi;
3265 um->id.family = x->props.family;
3266 um->id.proto = x->id.proto;
3267 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3268 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3269 um->new_sport = new_sport;
3270 um->old_sport = x->encap->encap_sport;
3271 um->reqid = x->props.reqid;
3272
3273 nlmsg_end(skb, nlh);
3274 return 0;
3275 }
3276
3277 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3278 __be16 sport)
3279 {
3280 struct net *net = xs_net(x);
3281 struct sk_buff *skb;
3282 int err;
3283
3284 if (x->id.proto != IPPROTO_ESP)
3285 return -EINVAL;
3286
3287 if (!x->encap)
3288 return -EINVAL;
3289
3290 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3291 if (skb == NULL)
3292 return -ENOMEM;
3293
3294 err = build_mapping(skb, x, ipaddr, sport);
3295 BUG_ON(err < 0);
3296
3297 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3298 }
3299
3300 static bool xfrm_is_alive(const struct km_event *c)
3301 {
3302 return (bool)xfrm_acquire_is_on(c->net);
3303 }
3304
3305 static struct xfrm_mgr netlink_mgr = {
3306 .notify = xfrm_send_state_notify,
3307 .acquire = xfrm_send_acquire,
3308 .compile_policy = xfrm_compile_policy,
3309 .notify_policy = xfrm_send_policy_notify,
3310 .report = xfrm_send_report,
3311 .migrate = xfrm_send_migrate,
3312 .new_mapping = xfrm_send_mapping,
3313 .is_alive = xfrm_is_alive,
3314 };
3315
3316 static int __net_init xfrm_user_net_init(struct net *net)
3317 {
3318 struct sock *nlsk;
3319 struct netlink_kernel_cfg cfg = {
3320 .groups = XFRMNLGRP_MAX,
3321 .input = xfrm_netlink_rcv,
3322 };
3323
3324 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3325 if (nlsk == NULL)
3326 return -ENOMEM;
3327 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3328 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3329 return 0;
3330 }
3331
3332 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3333 {
3334 struct net *net;
3335 list_for_each_entry(net, net_exit_list, exit_list)
3336 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3337 synchronize_net();
3338 list_for_each_entry(net, net_exit_list, exit_list)
3339 netlink_kernel_release(net->xfrm.nlsk_stash);
3340 }
3341
3342 static struct pernet_operations xfrm_user_net_ops = {
3343 .init = xfrm_user_net_init,
3344 .exit_batch = xfrm_user_net_exit,
3345 };
3346
3347 static int __init xfrm_user_init(void)
3348 {
3349 int rv;
3350
3351 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3352
3353 rv = register_pernet_subsys(&xfrm_user_net_ops);
3354 if (rv < 0)
3355 return rv;
3356 rv = xfrm_register_km(&netlink_mgr);
3357 if (rv < 0)
3358 unregister_pernet_subsys(&xfrm_user_net_ops);
3359 return rv;
3360 }
3361
3362 static void __exit xfrm_user_exit(void)
3363 {
3364 xfrm_unregister_km(&netlink_mgr);
3365 unregister_pernet_subsys(&xfrm_user_net_ops);
3366 }
3367
3368 module_init(xfrm_user_init);
3369 module_exit(xfrm_user_exit);
3370 MODULE_LICENSE("GPL");
3371 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
Linux with added FPC-III support