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IB/mlx4: fix sprintf format warning
[linux/fpc-iii.git] / net / xfrm / xfrm_user.c
blob2bfbd9121e3b21b0eb793d2d3a685bd4cebde22b
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) < 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) < 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) < 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 (p->flags & XFRM_STATE_ESN) {
125 if (!rt)
126 return -EINVAL;
127
128 rs = nla_data(rt);
129
130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
131 return -EINVAL;
132
133 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
134 nla_len(rt) != sizeof(*rs))
135 return -EINVAL;
136 }
137
138 if (!rt)
139 return 0;
140
141 /* As only ESP and AH support ESN feature. */
142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
143 return -EINVAL;
144
145 if (p->replay_window != 0)
146 return -EINVAL;
147
148 return 0;
149 }
150
151 static int verify_newsa_info(struct xfrm_usersa_info *p,
152 struct nlattr **attrs)
153 {
154 int err;
155
156 err = -EINVAL;
157 switch (p->family) {
158 case AF_INET:
159 break;
160
161 case AF_INET6:
162 #if IS_ENABLED(CONFIG_IPV6)
163 break;
164 #else
165 err = -EAFNOSUPPORT;
166 goto out;
167 #endif
168
169 default:
170 goto out;
171 }
172
173 err = -EINVAL;
174 switch (p->id.proto) {
175 case IPPROTO_AH:
176 if ((!attrs[XFRMA_ALG_AUTH] &&
177 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
178 attrs[XFRMA_ALG_AEAD] ||
179 attrs[XFRMA_ALG_CRYPT] ||
180 attrs[XFRMA_ALG_COMP] ||
181 attrs[XFRMA_TFCPAD])
182 goto out;
183 break;
184
185 case IPPROTO_ESP:
186 if (attrs[XFRMA_ALG_COMP])
187 goto out;
188 if (!attrs[XFRMA_ALG_AUTH] &&
189 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
190 !attrs[XFRMA_ALG_CRYPT] &&
191 !attrs[XFRMA_ALG_AEAD])
192 goto out;
193 if ((attrs[XFRMA_ALG_AUTH] ||
194 attrs[XFRMA_ALG_AUTH_TRUNC] ||
195 attrs[XFRMA_ALG_CRYPT]) &&
196 attrs[XFRMA_ALG_AEAD])
197 goto out;
198 if (attrs[XFRMA_TFCPAD] &&
199 p->mode != XFRM_MODE_TUNNEL)
200 goto out;
201 break;
202
203 case IPPROTO_COMP:
204 if (!attrs[XFRMA_ALG_COMP] ||
205 attrs[XFRMA_ALG_AEAD] ||
206 attrs[XFRMA_ALG_AUTH] ||
207 attrs[XFRMA_ALG_AUTH_TRUNC] ||
208 attrs[XFRMA_ALG_CRYPT] ||
209 attrs[XFRMA_TFCPAD] ||
210 (ntohl(p->id.spi) >= 0x10000))
211 goto out;
212 break;
213
214 #if IS_ENABLED(CONFIG_IPV6)
215 case IPPROTO_DSTOPTS:
216 case IPPROTO_ROUTING:
217 if (attrs[XFRMA_ALG_COMP] ||
218 attrs[XFRMA_ALG_AUTH] ||
219 attrs[XFRMA_ALG_AUTH_TRUNC] ||
220 attrs[XFRMA_ALG_AEAD] ||
221 attrs[XFRMA_ALG_CRYPT] ||
222 attrs[XFRMA_ENCAP] ||
223 attrs[XFRMA_SEC_CTX] ||
224 attrs[XFRMA_TFCPAD] ||
225 !attrs[XFRMA_COADDR])
226 goto out;
227 break;
228 #endif
229
230 default:
231 goto out;
232 }
233
234 if ((err = verify_aead(attrs)))
235 goto out;
236 if ((err = verify_auth_trunc(attrs)))
237 goto out;
238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
239 goto out;
240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
241 goto out;
242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
243 goto out;
244 if ((err = verify_sec_ctx_len(attrs)))
245 goto out;
246 if ((err = verify_replay(p, attrs)))
247 goto out;
248
249 err = -EINVAL;
250 switch (p->mode) {
251 case XFRM_MODE_TRANSPORT:
252 case XFRM_MODE_TUNNEL:
253 case XFRM_MODE_ROUTEOPTIMIZATION:
254 case XFRM_MODE_BEET:
255 break;
256
257 default:
258 goto out;
259 }
260
261 err = 0;
262
263 out:
264 return err;
265 }
266
267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
268 struct xfrm_algo_desc *(*get_byname)(const char *, int),
269 struct nlattr *rta)
270 {
271 struct xfrm_algo *p, *ualg;
272 struct xfrm_algo_desc *algo;
273
274 if (!rta)
275 return 0;
276
277 ualg = nla_data(rta);
278
279 algo = get_byname(ualg->alg_name, 1);
280 if (!algo)
281 return -ENOSYS;
282 *props = algo->desc.sadb_alg_id;
283
284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
285 if (!p)
286 return -ENOMEM;
287
288 strcpy(p->alg_name, algo->name);
289 *algpp = p;
290 return 0;
291 }
292
293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
294 {
295 struct xfrm_algo *p, *ualg;
296 struct xfrm_algo_desc *algo;
297
298 if (!rta)
299 return 0;
300
301 ualg = nla_data(rta);
302
303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
304 if (!algo)
305 return -ENOSYS;
306 x->props.ealgo = algo->desc.sadb_alg_id;
307
308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
309 if (!p)
310 return -ENOMEM;
311
312 strcpy(p->alg_name, algo->name);
313 x->ealg = p;
314 x->geniv = algo->uinfo.encr.geniv;
315 return 0;
316 }
317
318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
319 struct nlattr *rta)
320 {
321 struct xfrm_algo *ualg;
322 struct xfrm_algo_auth *p;
323 struct xfrm_algo_desc *algo;
324
325 if (!rta)
326 return 0;
327
328 ualg = nla_data(rta);
329
330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
331 if (!algo)
332 return -ENOSYS;
333 *props = algo->desc.sadb_alg_id;
334
335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
336 if (!p)
337 return -ENOMEM;
338
339 strcpy(p->alg_name, algo->name);
340 p->alg_key_len = ualg->alg_key_len;
341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
343
344 *algpp = p;
345 return 0;
346 }
347
348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
349 struct nlattr *rta)
350 {
351 struct xfrm_algo_auth *p, *ualg;
352 struct xfrm_algo_desc *algo;
353
354 if (!rta)
355 return 0;
356
357 ualg = nla_data(rta);
358
359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
360 if (!algo)
361 return -ENOSYS;
362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
363 return -EINVAL;
364 *props = algo->desc.sadb_alg_id;
365
366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
367 if (!p)
368 return -ENOMEM;
369
370 strcpy(p->alg_name, algo->name);
371 if (!p->alg_trunc_len)
372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
373
374 *algpp = p;
375 return 0;
376 }
377
378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
379 {
380 struct xfrm_algo_aead *p, *ualg;
381 struct xfrm_algo_desc *algo;
382
383 if (!rta)
384 return 0;
385
386 ualg = nla_data(rta);
387
388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
389 if (!algo)
390 return -ENOSYS;
391 x->props.ealgo = algo->desc.sadb_alg_id;
392
393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
394 if (!p)
395 return -ENOMEM;
396
397 strcpy(p->alg_name, algo->name);
398 x->aead = p;
399 x->geniv = algo->uinfo.aead.geniv;
400 return 0;
401 }
402
403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
404 struct nlattr *rp)
405 {
406 struct xfrm_replay_state_esn *up;
407 int ulen;
408
409 if (!replay_esn || !rp)
410 return 0;
411
412 up = nla_data(rp);
413 ulen = xfrm_replay_state_esn_len(up);
414
415 /* Check the overall length and the internal bitmap length to avoid
416 * potential overflow. */
417 if (nla_len(rp) < ulen ||
418 xfrm_replay_state_esn_len(replay_esn) != ulen ||
419 replay_esn->bmp_len != up->bmp_len)
420 return -EINVAL;
421
422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
423 return -EINVAL;
424
425 return 0;
426 }
427
428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
429 struct xfrm_replay_state_esn **preplay_esn,
430 struct nlattr *rta)
431 {
432 struct xfrm_replay_state_esn *p, *pp, *up;
433 int klen, ulen;
434
435 if (!rta)
436 return 0;
437
438 up = nla_data(rta);
439 klen = xfrm_replay_state_esn_len(up);
440 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
441
442 p = kzalloc(klen, GFP_KERNEL);
443 if (!p)
444 return -ENOMEM;
445
446 pp = kzalloc(klen, GFP_KERNEL);
447 if (!pp) {
448 kfree(p);
449 return -ENOMEM;
450 }
451
452 memcpy(p, up, ulen);
453 memcpy(pp, up, ulen);
454
455 *replay_esn = p;
456 *preplay_esn = pp;
457
458 return 0;
459 }
460
461 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
462 {
463 int len = 0;
464
465 if (xfrm_ctx) {
466 len += sizeof(struct xfrm_user_sec_ctx);
467 len += xfrm_ctx->ctx_len;
468 }
469 return len;
470 }
471
472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
473 {
474 memcpy(&x->id, &p->id, sizeof(x->id));
475 memcpy(&x->sel, &p->sel, sizeof(x->sel));
476 memcpy(&x->lft, &p->lft, sizeof(x->lft));
477 x->props.mode = p->mode;
478 x->props.replay_window = min_t(unsigned int, p->replay_window,
479 sizeof(x->replay.bitmap) * 8);
480 x->props.reqid = p->reqid;
481 x->props.family = p->family;
482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
483 x->props.flags = p->flags;
484
485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
486 x->sel.family = p->family;
487 }
488
489 /*
490 * someday when pfkey also has support, we could have the code
491 * somehow made shareable and move it to xfrm_state.c - JHS
492 *
493 */
494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
495 int update_esn)
496 {
497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
502
503 if (re) {
504 struct xfrm_replay_state_esn *replay_esn;
505 replay_esn = nla_data(re);
506 memcpy(x->replay_esn, replay_esn,
507 xfrm_replay_state_esn_len(replay_esn));
508 memcpy(x->preplay_esn, replay_esn,
509 xfrm_replay_state_esn_len(replay_esn));
510 }
511
512 if (rp) {
513 struct xfrm_replay_state *replay;
514 replay = nla_data(rp);
515 memcpy(&x->replay, replay, sizeof(*replay));
516 memcpy(&x->preplay, replay, sizeof(*replay));
517 }
518
519 if (lt) {
520 struct xfrm_lifetime_cur *ltime;
521 ltime = nla_data(lt);
522 x->curlft.bytes = ltime->bytes;
523 x->curlft.packets = ltime->packets;
524 x->curlft.add_time = ltime->add_time;
525 x->curlft.use_time = ltime->use_time;
526 }
527
528 if (et)
529 x->replay_maxage = nla_get_u32(et);
530
531 if (rt)
532 x->replay_maxdiff = nla_get_u32(rt);
533 }
534
535 static struct xfrm_state *xfrm_state_construct(struct net *net,
536 struct xfrm_usersa_info *p,
537 struct nlattr **attrs,
538 int *errp)
539 {
540 struct xfrm_state *x = xfrm_state_alloc(net);
541 int err = -ENOMEM;
542
543 if (!x)
544 goto error_no_put;
545
546 copy_from_user_state(x, p);
547
548 if (attrs[XFRMA_SA_EXTRA_FLAGS])
549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
550
551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
552 goto error;
553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
554 attrs[XFRMA_ALG_AUTH_TRUNC])))
555 goto error;
556 if (!x->props.aalgo) {
557 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
558 attrs[XFRMA_ALG_AUTH])))
559 goto error;
560 }
561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
562 goto error;
563 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
564 xfrm_calg_get_byname,
565 attrs[XFRMA_ALG_COMP])))
566 goto error;
567
568 if (attrs[XFRMA_ENCAP]) {
569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
570 sizeof(*x->encap), GFP_KERNEL);
571 if (x->encap == NULL)
572 goto error;
573 }
574
575 if (attrs[XFRMA_TFCPAD])
576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
577
578 if (attrs[XFRMA_COADDR]) {
579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
580 sizeof(*x->coaddr), GFP_KERNEL);
581 if (x->coaddr == NULL)
582 goto error;
583 }
584
585 xfrm_mark_get(attrs, &x->mark);
586
587 if (attrs[XFRMA_OUTPUT_MARK])
588 x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]);
589
590 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
591 if (err)
592 goto error;
593
594 if (attrs[XFRMA_SEC_CTX]) {
595 err = security_xfrm_state_alloc(x,
596 nla_data(attrs[XFRMA_SEC_CTX]));
597 if (err)
598 goto error;
599 }
600
601 if (attrs[XFRMA_OFFLOAD_DEV]) {
602 err = xfrm_dev_state_add(net, x,
603 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
604 if (err)
605 goto error;
606 }
607
608 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
609 attrs[XFRMA_REPLAY_ESN_VAL])))
610 goto error;
611
612 x->km.seq = p->seq;
613 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
614 /* sysctl_xfrm_aevent_etime is in 100ms units */
615 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
616
617 if ((err = xfrm_init_replay(x)))
618 goto error;
619
620 /* override default values from above */
621 xfrm_update_ae_params(x, attrs, 0);
622
623 return x;
624
625 error:
626 x->km.state = XFRM_STATE_DEAD;
627 xfrm_state_put(x);
628 error_no_put:
629 *errp = err;
630 return NULL;
631 }
632
633 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
634 struct nlattr **attrs)
635 {
636 struct net *net = sock_net(skb->sk);
637 struct xfrm_usersa_info *p = nlmsg_data(nlh);
638 struct xfrm_state *x;
639 int err;
640 struct km_event c;
641
642 err = verify_newsa_info(p, attrs);
643 if (err)
644 return err;
645
646 x = xfrm_state_construct(net, p, attrs, &err);
647 if (!x)
648 return err;
649
650 xfrm_state_hold(x);
651 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
652 err = xfrm_state_add(x);
653 else
654 err = xfrm_state_update(x);
655
656 xfrm_audit_state_add(x, err ? 0 : 1, true);
657
658 if (err < 0) {
659 x->km.state = XFRM_STATE_DEAD;
660 __xfrm_state_put(x);
661 goto out;
662 }
663
664 c.seq = nlh->nlmsg_seq;
665 c.portid = nlh->nlmsg_pid;
666 c.event = nlh->nlmsg_type;
667
668 km_state_notify(x, &c);
669 out:
670 xfrm_state_put(x);
671 return err;
672 }
673
674 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
675 struct xfrm_usersa_id *p,
676 struct nlattr **attrs,
677 int *errp)
678 {
679 struct xfrm_state *x = NULL;
680 struct xfrm_mark m;
681 int err;
682 u32 mark = xfrm_mark_get(attrs, &m);
683
684 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
685 err = -ESRCH;
686 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
687 } else {
688 xfrm_address_t *saddr = NULL;
689
690 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
691 if (!saddr) {
692 err = -EINVAL;
693 goto out;
694 }
695
696 err = -ESRCH;
697 x = xfrm_state_lookup_byaddr(net, mark,
698 &p->daddr, saddr,
699 p->proto, p->family);
700 }
701
702 out:
703 if (!x && errp)
704 *errp = err;
705 return x;
706 }
707
708 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
709 struct nlattr **attrs)
710 {
711 struct net *net = sock_net(skb->sk);
712 struct xfrm_state *x;
713 int err = -ESRCH;
714 struct km_event c;
715 struct xfrm_usersa_id *p = nlmsg_data(nlh);
716
717 x = xfrm_user_state_lookup(net, p, attrs, &err);
718 if (x == NULL)
719 return err;
720
721 if ((err = security_xfrm_state_delete(x)) != 0)
722 goto out;
723
724 if (xfrm_state_kern(x)) {
725 err = -EPERM;
726 goto out;
727 }
728
729 err = xfrm_state_delete(x);
730
731 if (err < 0)
732 goto out;
733
734 c.seq = nlh->nlmsg_seq;
735 c.portid = nlh->nlmsg_pid;
736 c.event = nlh->nlmsg_type;
737 km_state_notify(x, &c);
738
739 out:
740 xfrm_audit_state_delete(x, err ? 0 : 1, true);
741 xfrm_state_put(x);
742 return err;
743 }
744
745 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
746 {
747 memset(p, 0, sizeof(*p));
748 memcpy(&p->id, &x->id, sizeof(p->id));
749 memcpy(&p->sel, &x->sel, sizeof(p->sel));
750 memcpy(&p->lft, &x->lft, sizeof(p->lft));
751 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
752 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
753 put_unaligned(x->stats.replay, &p->stats.replay);
754 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
755 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
756 p->mode = x->props.mode;
757 p->replay_window = x->props.replay_window;
758 p->reqid = x->props.reqid;
759 p->family = x->props.family;
760 p->flags = x->props.flags;
761 p->seq = x->km.seq;
762 }
763
764 struct xfrm_dump_info {
765 struct sk_buff *in_skb;
766 struct sk_buff *out_skb;
767 u32 nlmsg_seq;
768 u16 nlmsg_flags;
769 };
770
771 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
772 {
773 struct xfrm_user_sec_ctx *uctx;
774 struct nlattr *attr;
775 int ctx_size = sizeof(*uctx) + s->ctx_len;
776
777 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
778 if (attr == NULL)
779 return -EMSGSIZE;
780
781 uctx = nla_data(attr);
782 uctx->exttype = XFRMA_SEC_CTX;
783 uctx->len = ctx_size;
784 uctx->ctx_doi = s->ctx_doi;
785 uctx->ctx_alg = s->ctx_alg;
786 uctx->ctx_len = s->ctx_len;
787 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
788
789 return 0;
790 }
791
792 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
793 {
794 struct xfrm_user_offload *xuo;
795 struct nlattr *attr;
796
797 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
798 if (attr == NULL)
799 return -EMSGSIZE;
800
801 xuo = nla_data(attr);
802 memset(xuo, 0, sizeof(*xuo));
803 xuo->ifindex = xso->dev->ifindex;
804 xuo->flags = xso->flags;
805
806 return 0;
807 }
808
809 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
810 {
811 struct xfrm_algo *algo;
812 struct nlattr *nla;
813
814 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
815 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
816 if (!nla)
817 return -EMSGSIZE;
818
819 algo = nla_data(nla);
820 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
821 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
822 algo->alg_key_len = auth->alg_key_len;
823
824 return 0;
825 }
826
827 /* Don't change this without updating xfrm_sa_len! */
828 static int copy_to_user_state_extra(struct xfrm_state *x,
829 struct xfrm_usersa_info *p,
830 struct sk_buff *skb)
831 {
832 int ret = 0;
833
834 copy_to_user_state(x, p);
835
836 if (x->props.extra_flags) {
837 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
838 x->props.extra_flags);
839 if (ret)
840 goto out;
841 }
842
843 if (x->coaddr) {
844 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
845 if (ret)
846 goto out;
847 }
848 if (x->lastused) {
849 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
850 XFRMA_PAD);
851 if (ret)
852 goto out;
853 }
854 if (x->aead) {
855 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
856 if (ret)
857 goto out;
858 }
859 if (x->aalg) {
860 ret = copy_to_user_auth(x->aalg, skb);
861 if (!ret)
862 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
863 xfrm_alg_auth_len(x->aalg), x->aalg);
864 if (ret)
865 goto out;
866 }
867 if (x->ealg) {
868 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
869 if (ret)
870 goto out;
871 }
872 if (x->calg) {
873 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
874 if (ret)
875 goto out;
876 }
877 if (x->encap) {
878 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
879 if (ret)
880 goto out;
881 }
882 if (x->tfcpad) {
883 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
884 if (ret)
885 goto out;
886 }
887 ret = xfrm_mark_put(skb, &x->mark);
888 if (ret)
889 goto out;
890 if (x->replay_esn)
891 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
892 xfrm_replay_state_esn_len(x->replay_esn),
893 x->replay_esn);
894 else
895 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
896 &x->replay);
897 if (ret)
898 goto out;
899 if(x->xso.dev)
900 ret = copy_user_offload(&x->xso, skb);
901 if (ret)
902 goto out;
903 if (x->props.output_mark) {
904 ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
905 if (ret)
906 goto out;
907 }
908 if (x->security)
909 ret = copy_sec_ctx(x->security, skb);
910 out:
911 return ret;
912 }
913
914 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
915 {
916 struct xfrm_dump_info *sp = ptr;
917 struct sk_buff *in_skb = sp->in_skb;
918 struct sk_buff *skb = sp->out_skb;
919 struct xfrm_usersa_info *p;
920 struct nlmsghdr *nlh;
921 int err;
922
923 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
924 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
925 if (nlh == NULL)
926 return -EMSGSIZE;
927
928 p = nlmsg_data(nlh);
929
930 err = copy_to_user_state_extra(x, p, skb);
931 if (err) {
932 nlmsg_cancel(skb, nlh);
933 return err;
934 }
935 nlmsg_end(skb, nlh);
936 return 0;
937 }
938
939 static int xfrm_dump_sa_done(struct netlink_callback *cb)
940 {
941 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
942 struct sock *sk = cb->skb->sk;
943 struct net *net = sock_net(sk);
944
945 if (cb->args[0])
946 xfrm_state_walk_done(walk, net);
947 return 0;
948 }
949
950 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
951 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
952 {
953 struct net *net = sock_net(skb->sk);
954 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
955 struct xfrm_dump_info info;
956
957 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
958 sizeof(cb->args) - sizeof(cb->args[0]));
959
960 info.in_skb = cb->skb;
961 info.out_skb = skb;
962 info.nlmsg_seq = cb->nlh->nlmsg_seq;
963 info.nlmsg_flags = NLM_F_MULTI;
964
965 if (!cb->args[0]) {
966 struct nlattr *attrs[XFRMA_MAX+1];
967 struct xfrm_address_filter *filter = NULL;
968 u8 proto = 0;
969 int err;
970
971 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
972 NULL);
973 if (err < 0)
974 return err;
975
976 if (attrs[XFRMA_ADDRESS_FILTER]) {
977 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
978 sizeof(*filter), GFP_KERNEL);
979 if (filter == NULL)
980 return -ENOMEM;
981 }
982
983 if (attrs[XFRMA_PROTO])
984 proto = nla_get_u8(attrs[XFRMA_PROTO]);
985
986 xfrm_state_walk_init(walk, proto, filter);
987 cb->args[0] = 1;
988 }
989
990 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
991
992 return skb->len;
993 }
994
995 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
996 struct xfrm_state *x, u32 seq)
997 {
998 struct xfrm_dump_info info;
999 struct sk_buff *skb;
1000 int err;
1001
1002 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1003 if (!skb)
1004 return ERR_PTR(-ENOMEM);
1005
1006 info.in_skb = in_skb;
1007 info.out_skb = skb;
1008 info.nlmsg_seq = seq;
1009 info.nlmsg_flags = 0;
1010
1011 err = dump_one_state(x, 0, &info);
1012 if (err) {
1013 kfree_skb(skb);
1014 return ERR_PTR(err);
1015 }
1016
1017 return skb;
1018 }
1019
1020 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1021 * Must be called with RCU read lock.
1022 */
1023 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1024 u32 pid, unsigned int group)
1025 {
1026 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1027
1028 if (nlsk)
1029 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1030 else
1031 return -1;
1032 }
1033
1034 static inline size_t xfrm_spdinfo_msgsize(void)
1035 {
1036 return NLMSG_ALIGN(4)
1037 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1038 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1039 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1040 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1041 }
1042
1043 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1044 u32 portid, u32 seq, u32 flags)
1045 {
1046 struct xfrmk_spdinfo si;
1047 struct xfrmu_spdinfo spc;
1048 struct xfrmu_spdhinfo sph;
1049 struct xfrmu_spdhthresh spt4, spt6;
1050 struct nlmsghdr *nlh;
1051 int err;
1052 u32 *f;
1053 unsigned lseq;
1054
1055 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1056 if (nlh == NULL) /* shouldn't really happen ... */
1057 return -EMSGSIZE;
1058
1059 f = nlmsg_data(nlh);
1060 *f = flags;
1061 xfrm_spd_getinfo(net, &si);
1062 spc.incnt = si.incnt;
1063 spc.outcnt = si.outcnt;
1064 spc.fwdcnt = si.fwdcnt;
1065 spc.inscnt = si.inscnt;
1066 spc.outscnt = si.outscnt;
1067 spc.fwdscnt = si.fwdscnt;
1068 sph.spdhcnt = si.spdhcnt;
1069 sph.spdhmcnt = si.spdhmcnt;
1070
1071 do {
1072 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1073
1074 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1075 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1076 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1077 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1078 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1079
1080 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1081 if (!err)
1082 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1083 if (!err)
1084 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1085 if (!err)
1086 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1087 if (err) {
1088 nlmsg_cancel(skb, nlh);
1089 return err;
1090 }
1091
1092 nlmsg_end(skb, nlh);
1093 return 0;
1094 }
1095
1096 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1097 struct nlattr **attrs)
1098 {
1099 struct net *net = sock_net(skb->sk);
1100 struct xfrmu_spdhthresh *thresh4 = NULL;
1101 struct xfrmu_spdhthresh *thresh6 = NULL;
1102
1103 /* selector prefixlen thresholds to hash policies */
1104 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1105 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1106
1107 if (nla_len(rta) < sizeof(*thresh4))
1108 return -EINVAL;
1109 thresh4 = nla_data(rta);
1110 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1111 return -EINVAL;
1112 }
1113 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1114 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1115
1116 if (nla_len(rta) < sizeof(*thresh6))
1117 return -EINVAL;
1118 thresh6 = nla_data(rta);
1119 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1120 return -EINVAL;
1121 }
1122
1123 if (thresh4 || thresh6) {
1124 write_seqlock(&net->xfrm.policy_hthresh.lock);
1125 if (thresh4) {
1126 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1127 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1128 }
1129 if (thresh6) {
1130 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1131 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1132 }
1133 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1134
1135 xfrm_policy_hash_rebuild(net);
1136 }
1137
1138 return 0;
1139 }
1140
1141 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1142 struct nlattr **attrs)
1143 {
1144 struct net *net = sock_net(skb->sk);
1145 struct sk_buff *r_skb;
1146 u32 *flags = nlmsg_data(nlh);
1147 u32 sportid = NETLINK_CB(skb).portid;
1148 u32 seq = nlh->nlmsg_seq;
1149
1150 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1151 if (r_skb == NULL)
1152 return -ENOMEM;
1153
1154 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1155 BUG();
1156
1157 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1158 }
1159
1160 static inline size_t xfrm_sadinfo_msgsize(void)
1161 {
1162 return NLMSG_ALIGN(4)
1163 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1164 + nla_total_size(4); /* XFRMA_SAD_CNT */
1165 }
1166
1167 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1168 u32 portid, u32 seq, u32 flags)
1169 {
1170 struct xfrmk_sadinfo si;
1171 struct xfrmu_sadhinfo sh;
1172 struct nlmsghdr *nlh;
1173 int err;
1174 u32 *f;
1175
1176 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1177 if (nlh == NULL) /* shouldn't really happen ... */
1178 return -EMSGSIZE;
1179
1180 f = nlmsg_data(nlh);
1181 *f = flags;
1182 xfrm_sad_getinfo(net, &si);
1183
1184 sh.sadhmcnt = si.sadhmcnt;
1185 sh.sadhcnt = si.sadhcnt;
1186
1187 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1188 if (!err)
1189 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1190 if (err) {
1191 nlmsg_cancel(skb, nlh);
1192 return err;
1193 }
1194
1195 nlmsg_end(skb, nlh);
1196 return 0;
1197 }
1198
1199 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1200 struct nlattr **attrs)
1201 {
1202 struct net *net = sock_net(skb->sk);
1203 struct sk_buff *r_skb;
1204 u32 *flags = nlmsg_data(nlh);
1205 u32 sportid = NETLINK_CB(skb).portid;
1206 u32 seq = nlh->nlmsg_seq;
1207
1208 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1209 if (r_skb == NULL)
1210 return -ENOMEM;
1211
1212 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1213 BUG();
1214
1215 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1216 }
1217
1218 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1219 struct nlattr **attrs)
1220 {
1221 struct net *net = sock_net(skb->sk);
1222 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1223 struct xfrm_state *x;
1224 struct sk_buff *resp_skb;
1225 int err = -ESRCH;
1226
1227 x = xfrm_user_state_lookup(net, p, attrs, &err);
1228 if (x == NULL)
1229 goto out_noput;
1230
1231 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1232 if (IS_ERR(resp_skb)) {
1233 err = PTR_ERR(resp_skb);
1234 } else {
1235 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1236 }
1237 xfrm_state_put(x);
1238 out_noput:
1239 return err;
1240 }
1241
1242 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1243 struct nlattr **attrs)
1244 {
1245 struct net *net = sock_net(skb->sk);
1246 struct xfrm_state *x;
1247 struct xfrm_userspi_info *p;
1248 struct sk_buff *resp_skb;
1249 xfrm_address_t *daddr;
1250 int family;
1251 int err;
1252 u32 mark;
1253 struct xfrm_mark m;
1254
1255 p = nlmsg_data(nlh);
1256 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1257 if (err)
1258 goto out_noput;
1259
1260 family = p->info.family;
1261 daddr = &p->info.id.daddr;
1262
1263 x = NULL;
1264
1265 mark = xfrm_mark_get(attrs, &m);
1266 if (p->info.seq) {
1267 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1268 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1269 xfrm_state_put(x);
1270 x = NULL;
1271 }
1272 }
1273
1274 if (!x)
1275 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1276 p->info.id.proto, daddr,
1277 &p->info.saddr, 1,
1278 family);
1279 err = -ENOENT;
1280 if (x == NULL)
1281 goto out_noput;
1282
1283 err = xfrm_alloc_spi(x, p->min, p->max);
1284 if (err)
1285 goto out;
1286
1287 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1288 if (IS_ERR(resp_skb)) {
1289 err = PTR_ERR(resp_skb);
1290 goto out;
1291 }
1292
1293 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1294
1295 out:
1296 xfrm_state_put(x);
1297 out_noput:
1298 return err;
1299 }
1300
1301 static int verify_policy_dir(u8 dir)
1302 {
1303 switch (dir) {
1304 case XFRM_POLICY_IN:
1305 case XFRM_POLICY_OUT:
1306 case XFRM_POLICY_FWD:
1307 break;
1308
1309 default:
1310 return -EINVAL;
1311 }
1312
1313 return 0;
1314 }
1315
1316 static int verify_policy_type(u8 type)
1317 {
1318 switch (type) {
1319 case XFRM_POLICY_TYPE_MAIN:
1320 #ifdef CONFIG_XFRM_SUB_POLICY
1321 case XFRM_POLICY_TYPE_SUB:
1322 #endif
1323 break;
1324
1325 default:
1326 return -EINVAL;
1327 }
1328
1329 return 0;
1330 }
1331
1332 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1333 {
1334 int ret;
1335
1336 switch (p->share) {
1337 case XFRM_SHARE_ANY:
1338 case XFRM_SHARE_SESSION:
1339 case XFRM_SHARE_USER:
1340 case XFRM_SHARE_UNIQUE:
1341 break;
1342
1343 default:
1344 return -EINVAL;
1345 }
1346
1347 switch (p->action) {
1348 case XFRM_POLICY_ALLOW:
1349 case XFRM_POLICY_BLOCK:
1350 break;
1351
1352 default:
1353 return -EINVAL;
1354 }
1355
1356 switch (p->sel.family) {
1357 case AF_INET:
1358 break;
1359
1360 case AF_INET6:
1361 #if IS_ENABLED(CONFIG_IPV6)
1362 break;
1363 #else
1364 return -EAFNOSUPPORT;
1365 #endif
1366
1367 default:
1368 return -EINVAL;
1369 }
1370
1371 ret = verify_policy_dir(p->dir);
1372 if (ret)
1373 return ret;
1374 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1375 return -EINVAL;
1376
1377 return 0;
1378 }
1379
1380 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1381 {
1382 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1383 struct xfrm_user_sec_ctx *uctx;
1384
1385 if (!rt)
1386 return 0;
1387
1388 uctx = nla_data(rt);
1389 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1390 }
1391
1392 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1393 int nr)
1394 {
1395 int i;
1396
1397 xp->xfrm_nr = nr;
1398 for (i = 0; i < nr; i++, ut++) {
1399 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1400
1401 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1402 memcpy(&t->saddr, &ut->saddr,
1403 sizeof(xfrm_address_t));
1404 t->reqid = ut->reqid;
1405 t->mode = ut->mode;
1406 t->share = ut->share;
1407 t->optional = ut->optional;
1408 t->aalgos = ut->aalgos;
1409 t->ealgos = ut->ealgos;
1410 t->calgos = ut->calgos;
1411 /* If all masks are ~0, then we allow all algorithms. */
1412 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1413 t->encap_family = ut->family;
1414 }
1415 }
1416
1417 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1418 {
1419 int i;
1420
1421 if (nr > XFRM_MAX_DEPTH)
1422 return -EINVAL;
1423
1424 for (i = 0; i < nr; i++) {
1425 /* We never validated the ut->family value, so many
1426 * applications simply leave it at zero. The check was
1427 * never made and ut->family was ignored because all
1428 * templates could be assumed to have the same family as
1429 * the policy itself. Now that we will have ipv4-in-ipv6
1430 * and ipv6-in-ipv4 tunnels, this is no longer true.
1431 */
1432 if (!ut[i].family)
1433 ut[i].family = family;
1434
1435 switch (ut[i].family) {
1436 case AF_INET:
1437 break;
1438 #if IS_ENABLED(CONFIG_IPV6)
1439 case AF_INET6:
1440 break;
1441 #endif
1442 default:
1443 return -EINVAL;
1444 }
1445 }
1446
1447 return 0;
1448 }
1449
1450 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1451 {
1452 struct nlattr *rt = attrs[XFRMA_TMPL];
1453
1454 if (!rt) {
1455 pol->xfrm_nr = 0;
1456 } else {
1457 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1458 int nr = nla_len(rt) / sizeof(*utmpl);
1459 int err;
1460
1461 err = validate_tmpl(nr, utmpl, pol->family);
1462 if (err)
1463 return err;
1464
1465 copy_templates(pol, utmpl, nr);
1466 }
1467 return 0;
1468 }
1469
1470 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1471 {
1472 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1473 struct xfrm_userpolicy_type *upt;
1474 u8 type = XFRM_POLICY_TYPE_MAIN;
1475 int err;
1476
1477 if (rt) {
1478 upt = nla_data(rt);
1479 type = upt->type;
1480 }
1481
1482 err = verify_policy_type(type);
1483 if (err)
1484 return err;
1485
1486 *tp = type;
1487 return 0;
1488 }
1489
1490 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1491 {
1492 xp->priority = p->priority;
1493 xp->index = p->index;
1494 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1495 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1496 xp->action = p->action;
1497 xp->flags = p->flags;
1498 xp->family = p->sel.family;
1499 /* XXX xp->share = p->share; */
1500 }
1501
1502 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1503 {
1504 memset(p, 0, sizeof(*p));
1505 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1506 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1507 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1508 p->priority = xp->priority;
1509 p->index = xp->index;
1510 p->sel.family = xp->family;
1511 p->dir = dir;
1512 p->action = xp->action;
1513 p->flags = xp->flags;
1514 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1515 }
1516
1517 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1518 {
1519 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1520 int err;
1521
1522 if (!xp) {
1523 *errp = -ENOMEM;
1524 return NULL;
1525 }
1526
1527 copy_from_user_policy(xp, p);
1528
1529 err = copy_from_user_policy_type(&xp->type, attrs);
1530 if (err)
1531 goto error;
1532
1533 if (!(err = copy_from_user_tmpl(xp, attrs)))
1534 err = copy_from_user_sec_ctx(xp, attrs);
1535 if (err)
1536 goto error;
1537
1538 xfrm_mark_get(attrs, &xp->mark);
1539
1540 return xp;
1541 error:
1542 *errp = err;
1543 xp->walk.dead = 1;
1544 xfrm_policy_destroy(xp);
1545 return NULL;
1546 }
1547
1548 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1549 struct nlattr **attrs)
1550 {
1551 struct net *net = sock_net(skb->sk);
1552 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1553 struct xfrm_policy *xp;
1554 struct km_event c;
1555 int err;
1556 int excl;
1557
1558 err = verify_newpolicy_info(p);
1559 if (err)
1560 return err;
1561 err = verify_sec_ctx_len(attrs);
1562 if (err)
1563 return err;
1564
1565 xp = xfrm_policy_construct(net, p, attrs, &err);
1566 if (!xp)
1567 return err;
1568
1569 /* shouldn't excl be based on nlh flags??
1570 * Aha! this is anti-netlink really i.e more pfkey derived
1571 * in netlink excl is a flag and you wouldnt need
1572 * a type XFRM_MSG_UPDPOLICY - JHS */
1573 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1574 err = xfrm_policy_insert(p->dir, xp, excl);
1575 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1576
1577 if (err) {
1578 security_xfrm_policy_free(xp->security);
1579 kfree(xp);
1580 return err;
1581 }
1582
1583 c.event = nlh->nlmsg_type;
1584 c.seq = nlh->nlmsg_seq;
1585 c.portid = nlh->nlmsg_pid;
1586 km_policy_notify(xp, p->dir, &c);
1587
1588 xfrm_pol_put(xp);
1589
1590 return 0;
1591 }
1592
1593 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1594 {
1595 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1596 int i;
1597
1598 if (xp->xfrm_nr == 0)
1599 return 0;
1600
1601 for (i = 0; i < xp->xfrm_nr; i++) {
1602 struct xfrm_user_tmpl *up = &vec[i];
1603 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1604
1605 memset(up, 0, sizeof(*up));
1606 memcpy(&up->id, &kp->id, sizeof(up->id));
1607 up->family = kp->encap_family;
1608 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1609 up->reqid = kp->reqid;
1610 up->mode = kp->mode;
1611 up->share = kp->share;
1612 up->optional = kp->optional;
1613 up->aalgos = kp->aalgos;
1614 up->ealgos = kp->ealgos;
1615 up->calgos = kp->calgos;
1616 }
1617
1618 return nla_put(skb, XFRMA_TMPL,
1619 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1620 }
1621
1622 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1623 {
1624 if (x->security) {
1625 return copy_sec_ctx(x->security, skb);
1626 }
1627 return 0;
1628 }
1629
1630 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1631 {
1632 if (xp->security)
1633 return copy_sec_ctx(xp->security, skb);
1634 return 0;
1635 }
1636 static inline size_t userpolicy_type_attrsize(void)
1637 {
1638 #ifdef CONFIG_XFRM_SUB_POLICY
1639 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1640 #else
1641 return 0;
1642 #endif
1643 }
1644
1645 #ifdef CONFIG_XFRM_SUB_POLICY
1646 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1647 {
1648 struct xfrm_userpolicy_type upt = {
1649 .type = type,
1650 };
1651
1652 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1653 }
1654
1655 #else
1656 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1657 {
1658 return 0;
1659 }
1660 #endif
1661
1662 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1663 {
1664 struct xfrm_dump_info *sp = ptr;
1665 struct xfrm_userpolicy_info *p;
1666 struct sk_buff *in_skb = sp->in_skb;
1667 struct sk_buff *skb = sp->out_skb;
1668 struct nlmsghdr *nlh;
1669 int err;
1670
1671 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1672 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1673 if (nlh == NULL)
1674 return -EMSGSIZE;
1675
1676 p = nlmsg_data(nlh);
1677 copy_to_user_policy(xp, p, dir);
1678 err = copy_to_user_tmpl(xp, skb);
1679 if (!err)
1680 err = copy_to_user_sec_ctx(xp, skb);
1681 if (!err)
1682 err = copy_to_user_policy_type(xp->type, skb);
1683 if (!err)
1684 err = xfrm_mark_put(skb, &xp->mark);
1685 if (err) {
1686 nlmsg_cancel(skb, nlh);
1687 return err;
1688 }
1689 nlmsg_end(skb, nlh);
1690 return 0;
1691 }
1692
1693 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1694 {
1695 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1696 struct net *net = sock_net(cb->skb->sk);
1697
1698 xfrm_policy_walk_done(walk, net);
1699 return 0;
1700 }
1701
1702 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1703 {
1704 struct net *net = sock_net(skb->sk);
1705 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1706 struct xfrm_dump_info info;
1707
1708 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1709 sizeof(cb->args) - sizeof(cb->args[0]));
1710
1711 info.in_skb = cb->skb;
1712 info.out_skb = skb;
1713 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1714 info.nlmsg_flags = NLM_F_MULTI;
1715
1716 if (!cb->args[0]) {
1717 cb->args[0] = 1;
1718 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1719 }
1720
1721 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1722
1723 return skb->len;
1724 }
1725
1726 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1727 struct xfrm_policy *xp,
1728 int dir, u32 seq)
1729 {
1730 struct xfrm_dump_info info;
1731 struct sk_buff *skb;
1732 int err;
1733
1734 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1735 if (!skb)
1736 return ERR_PTR(-ENOMEM);
1737
1738 info.in_skb = in_skb;
1739 info.out_skb = skb;
1740 info.nlmsg_seq = seq;
1741 info.nlmsg_flags = 0;
1742
1743 err = dump_one_policy(xp, dir, 0, &info);
1744 if (err) {
1745 kfree_skb(skb);
1746 return ERR_PTR(err);
1747 }
1748
1749 return skb;
1750 }
1751
1752 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1753 struct nlattr **attrs)
1754 {
1755 struct net *net = sock_net(skb->sk);
1756 struct xfrm_policy *xp;
1757 struct xfrm_userpolicy_id *p;
1758 u8 type = XFRM_POLICY_TYPE_MAIN;
1759 int err;
1760 struct km_event c;
1761 int delete;
1762 struct xfrm_mark m;
1763 u32 mark = xfrm_mark_get(attrs, &m);
1764
1765 p = nlmsg_data(nlh);
1766 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1767
1768 err = copy_from_user_policy_type(&type, attrs);
1769 if (err)
1770 return err;
1771
1772 err = verify_policy_dir(p->dir);
1773 if (err)
1774 return err;
1775
1776 if (p->index)
1777 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1778 else {
1779 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1780 struct xfrm_sec_ctx *ctx;
1781
1782 err = verify_sec_ctx_len(attrs);
1783 if (err)
1784 return err;
1785
1786 ctx = NULL;
1787 if (rt) {
1788 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1789
1790 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1791 if (err)
1792 return err;
1793 }
1794 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1795 ctx, delete, &err);
1796 security_xfrm_policy_free(ctx);
1797 }
1798 if (xp == NULL)
1799 return -ENOENT;
1800
1801 if (!delete) {
1802 struct sk_buff *resp_skb;
1803
1804 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1805 if (IS_ERR(resp_skb)) {
1806 err = PTR_ERR(resp_skb);
1807 } else {
1808 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1809 NETLINK_CB(skb).portid);
1810 }
1811 } else {
1812 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1813
1814 if (err != 0)
1815 goto out;
1816
1817 c.data.byid = p->index;
1818 c.event = nlh->nlmsg_type;
1819 c.seq = nlh->nlmsg_seq;
1820 c.portid = nlh->nlmsg_pid;
1821 km_policy_notify(xp, p->dir, &c);
1822 }
1823
1824 out:
1825 xfrm_pol_put(xp);
1826 return err;
1827 }
1828
1829 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1830 struct nlattr **attrs)
1831 {
1832 struct net *net = sock_net(skb->sk);
1833 struct km_event c;
1834 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1835 int err;
1836
1837 err = xfrm_state_flush(net, p->proto, true);
1838 if (err) {
1839 if (err == -ESRCH) /* empty table */
1840 return 0;
1841 return err;
1842 }
1843 c.data.proto = p->proto;
1844 c.event = nlh->nlmsg_type;
1845 c.seq = nlh->nlmsg_seq;
1846 c.portid = nlh->nlmsg_pid;
1847 c.net = net;
1848 km_state_notify(NULL, &c);
1849
1850 return 0;
1851 }
1852
1853 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1854 {
1855 size_t replay_size = x->replay_esn ?
1856 xfrm_replay_state_esn_len(x->replay_esn) :
1857 sizeof(struct xfrm_replay_state);
1858
1859 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1860 + nla_total_size(replay_size)
1861 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1862 + nla_total_size(sizeof(struct xfrm_mark))
1863 + nla_total_size(4) /* XFRM_AE_RTHR */
1864 + nla_total_size(4); /* XFRM_AE_ETHR */
1865 }
1866
1867 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1868 {
1869 struct xfrm_aevent_id *id;
1870 struct nlmsghdr *nlh;
1871 int err;
1872
1873 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1874 if (nlh == NULL)
1875 return -EMSGSIZE;
1876
1877 id = nlmsg_data(nlh);
1878 memset(&id->sa_id, 0, sizeof(id->sa_id));
1879 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1880 id->sa_id.spi = x->id.spi;
1881 id->sa_id.family = x->props.family;
1882 id->sa_id.proto = x->id.proto;
1883 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1884 id->reqid = x->props.reqid;
1885 id->flags = c->data.aevent;
1886
1887 if (x->replay_esn) {
1888 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1889 xfrm_replay_state_esn_len(x->replay_esn),
1890 x->replay_esn);
1891 } else {
1892 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1893 &x->replay);
1894 }
1895 if (err)
1896 goto out_cancel;
1897 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1898 XFRMA_PAD);
1899 if (err)
1900 goto out_cancel;
1901
1902 if (id->flags & XFRM_AE_RTHR) {
1903 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1904 if (err)
1905 goto out_cancel;
1906 }
1907 if (id->flags & XFRM_AE_ETHR) {
1908 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1909 x->replay_maxage * 10 / HZ);
1910 if (err)
1911 goto out_cancel;
1912 }
1913 err = xfrm_mark_put(skb, &x->mark);
1914 if (err)
1915 goto out_cancel;
1916
1917 nlmsg_end(skb, nlh);
1918 return 0;
1919
1920 out_cancel:
1921 nlmsg_cancel(skb, nlh);
1922 return err;
1923 }
1924
1925 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1926 struct nlattr **attrs)
1927 {
1928 struct net *net = sock_net(skb->sk);
1929 struct xfrm_state *x;
1930 struct sk_buff *r_skb;
1931 int err;
1932 struct km_event c;
1933 u32 mark;
1934 struct xfrm_mark m;
1935 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1936 struct xfrm_usersa_id *id = &p->sa_id;
1937
1938 mark = xfrm_mark_get(attrs, &m);
1939
1940 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1941 if (x == NULL)
1942 return -ESRCH;
1943
1944 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1945 if (r_skb == NULL) {
1946 xfrm_state_put(x);
1947 return -ENOMEM;
1948 }
1949
1950 /*
1951 * XXX: is this lock really needed - none of the other
1952 * gets lock (the concern is things getting updated
1953 * while we are still reading) - jhs
1954 */
1955 spin_lock_bh(&x->lock);
1956 c.data.aevent = p->flags;
1957 c.seq = nlh->nlmsg_seq;
1958 c.portid = nlh->nlmsg_pid;
1959
1960 if (build_aevent(r_skb, x, &c) < 0)
1961 BUG();
1962 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1963 spin_unlock_bh(&x->lock);
1964 xfrm_state_put(x);
1965 return err;
1966 }
1967
1968 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1969 struct nlattr **attrs)
1970 {
1971 struct net *net = sock_net(skb->sk);
1972 struct xfrm_state *x;
1973 struct km_event c;
1974 int err = -EINVAL;
1975 u32 mark = 0;
1976 struct xfrm_mark m;
1977 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1978 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1979 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1980 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1981 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1982 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
1983
1984 if (!lt && !rp && !re && !et && !rt)
1985 return err;
1986
1987 /* pedantic mode - thou shalt sayeth replaceth */
1988 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1989 return err;
1990
1991 mark = xfrm_mark_get(attrs, &m);
1992
1993 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1994 if (x == NULL)
1995 return -ESRCH;
1996
1997 if (x->km.state != XFRM_STATE_VALID)
1998 goto out;
1999
2000 err = xfrm_replay_verify_len(x->replay_esn, re);
2001 if (err)
2002 goto out;
2003
2004 spin_lock_bh(&x->lock);
2005 xfrm_update_ae_params(x, attrs, 1);
2006 spin_unlock_bh(&x->lock);
2007
2008 c.event = nlh->nlmsg_type;
2009 c.seq = nlh->nlmsg_seq;
2010 c.portid = nlh->nlmsg_pid;
2011 c.data.aevent = XFRM_AE_CU;
2012 km_state_notify(x, &c);
2013 err = 0;
2014 out:
2015 xfrm_state_put(x);
2016 return err;
2017 }
2018
2019 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2020 struct nlattr **attrs)
2021 {
2022 struct net *net = sock_net(skb->sk);
2023 struct km_event c;
2024 u8 type = XFRM_POLICY_TYPE_MAIN;
2025 int err;
2026
2027 err = copy_from_user_policy_type(&type, attrs);
2028 if (err)
2029 return err;
2030
2031 err = xfrm_policy_flush(net, type, true);
2032 if (err) {
2033 if (err == -ESRCH) /* empty table */
2034 return 0;
2035 return err;
2036 }
2037
2038 c.data.type = type;
2039 c.event = nlh->nlmsg_type;
2040 c.seq = nlh->nlmsg_seq;
2041 c.portid = nlh->nlmsg_pid;
2042 c.net = net;
2043 km_policy_notify(NULL, 0, &c);
2044 return 0;
2045 }
2046
2047 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2048 struct nlattr **attrs)
2049 {
2050 struct net *net = sock_net(skb->sk);
2051 struct xfrm_policy *xp;
2052 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2053 struct xfrm_userpolicy_info *p = &up->pol;
2054 u8 type = XFRM_POLICY_TYPE_MAIN;
2055 int err = -ENOENT;
2056 struct xfrm_mark m;
2057 u32 mark = xfrm_mark_get(attrs, &m);
2058
2059 err = copy_from_user_policy_type(&type, attrs);
2060 if (err)
2061 return err;
2062
2063 err = verify_policy_dir(p->dir);
2064 if (err)
2065 return err;
2066
2067 if (p->index)
2068 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2069 else {
2070 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2071 struct xfrm_sec_ctx *ctx;
2072
2073 err = verify_sec_ctx_len(attrs);
2074 if (err)
2075 return err;
2076
2077 ctx = NULL;
2078 if (rt) {
2079 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2080
2081 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2082 if (err)
2083 return err;
2084 }
2085 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2086 &p->sel, ctx, 0, &err);
2087 security_xfrm_policy_free(ctx);
2088 }
2089 if (xp == NULL)
2090 return -ENOENT;
2091
2092 if (unlikely(xp->walk.dead))
2093 goto out;
2094
2095 err = 0;
2096 if (up->hard) {
2097 xfrm_policy_delete(xp, p->dir);
2098 xfrm_audit_policy_delete(xp, 1, true);
2099 }
2100 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2101
2102 out:
2103 xfrm_pol_put(xp);
2104 return err;
2105 }
2106
2107 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2108 struct nlattr **attrs)
2109 {
2110 struct net *net = sock_net(skb->sk);
2111 struct xfrm_state *x;
2112 int err;
2113 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2114 struct xfrm_usersa_info *p = &ue->state;
2115 struct xfrm_mark m;
2116 u32 mark = xfrm_mark_get(attrs, &m);
2117
2118 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2119
2120 err = -ENOENT;
2121 if (x == NULL)
2122 return err;
2123
2124 spin_lock_bh(&x->lock);
2125 err = -EINVAL;
2126 if (x->km.state != XFRM_STATE_VALID)
2127 goto out;
2128 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2129
2130 if (ue->hard) {
2131 __xfrm_state_delete(x);
2132 xfrm_audit_state_delete(x, 1, true);
2133 }
2134 err = 0;
2135 out:
2136 spin_unlock_bh(&x->lock);
2137 xfrm_state_put(x);
2138 return err;
2139 }
2140
2141 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2142 struct nlattr **attrs)
2143 {
2144 struct net *net = sock_net(skb->sk);
2145 struct xfrm_policy *xp;
2146 struct xfrm_user_tmpl *ut;
2147 int i;
2148 struct nlattr *rt = attrs[XFRMA_TMPL];
2149 struct xfrm_mark mark;
2150
2151 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2152 struct xfrm_state *x = xfrm_state_alloc(net);
2153 int err = -ENOMEM;
2154
2155 if (!x)
2156 goto nomem;
2157
2158 xfrm_mark_get(attrs, &mark);
2159
2160 err = verify_newpolicy_info(&ua->policy);
2161 if (err)
2162 goto free_state;
2163
2164 /* build an XP */
2165 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2166 if (!xp)
2167 goto free_state;
2168
2169 memcpy(&x->id, &ua->id, sizeof(ua->id));
2170 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2171 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2172 xp->mark.m = x->mark.m = mark.m;
2173 xp->mark.v = x->mark.v = mark.v;
2174 ut = nla_data(rt);
2175 /* extract the templates and for each call km_key */
2176 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2177 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2178 memcpy(&x->id, &t->id, sizeof(x->id));
2179 x->props.mode = t->mode;
2180 x->props.reqid = t->reqid;
2181 x->props.family = ut->family;
2182 t->aalgos = ua->aalgos;
2183 t->ealgos = ua->ealgos;
2184 t->calgos = ua->calgos;
2185 err = km_query(x, t, xp);
2186
2187 }
2188
2189 kfree(x);
2190 kfree(xp);
2191
2192 return 0;
2193
2194 free_state:
2195 kfree(x);
2196 nomem:
2197 return err;
2198 }
2199
2200 #ifdef CONFIG_XFRM_MIGRATE
2201 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2202 struct xfrm_kmaddress *k,
2203 struct nlattr **attrs, int *num)
2204 {
2205 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2206 struct xfrm_user_migrate *um;
2207 int i, num_migrate;
2208
2209 if (k != NULL) {
2210 struct xfrm_user_kmaddress *uk;
2211
2212 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2213 memcpy(&k->local, &uk->local, sizeof(k->local));
2214 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2215 k->family = uk->family;
2216 k->reserved = uk->reserved;
2217 }
2218
2219 um = nla_data(rt);
2220 num_migrate = nla_len(rt) / sizeof(*um);
2221
2222 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2223 return -EINVAL;
2224
2225 for (i = 0; i < num_migrate; i++, um++, ma++) {
2226 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2227 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2228 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2229 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2230
2231 ma->proto = um->proto;
2232 ma->mode = um->mode;
2233 ma->reqid = um->reqid;
2234
2235 ma->old_family = um->old_family;
2236 ma->new_family = um->new_family;
2237 }
2238
2239 *num = i;
2240 return 0;
2241 }
2242
2243 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2244 struct nlattr **attrs)
2245 {
2246 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2247 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2248 struct xfrm_kmaddress km, *kmp;
2249 u8 type;
2250 int err;
2251 int n = 0;
2252 struct net *net = sock_net(skb->sk);
2253 struct xfrm_encap_tmpl *encap = NULL;
2254
2255 if (attrs[XFRMA_MIGRATE] == NULL)
2256 return -EINVAL;
2257
2258 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2259
2260 err = copy_from_user_policy_type(&type, attrs);
2261 if (err)
2262 return err;
2263
2264 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2265 if (err)
2266 return err;
2267
2268 if (!n)
2269 return 0;
2270
2271 if (attrs[XFRMA_ENCAP]) {
2272 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2273 sizeof(*encap), GFP_KERNEL);
2274 if (!encap)
2275 return 0;
2276 }
2277
2278 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2279
2280 kfree(encap);
2281
2282 return err;
2283 }
2284 #else
2285 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2286 struct nlattr **attrs)
2287 {
2288 return -ENOPROTOOPT;
2289 }
2290 #endif
2291
2292 #ifdef CONFIG_XFRM_MIGRATE
2293 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2294 {
2295 struct xfrm_user_migrate um;
2296
2297 memset(&um, 0, sizeof(um));
2298 um.proto = m->proto;
2299 um.mode = m->mode;
2300 um.reqid = m->reqid;
2301 um.old_family = m->old_family;
2302 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2303 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2304 um.new_family = m->new_family;
2305 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2306 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2307
2308 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2309 }
2310
2311 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2312 {
2313 struct xfrm_user_kmaddress uk;
2314
2315 memset(&uk, 0, sizeof(uk));
2316 uk.family = k->family;
2317 uk.reserved = k->reserved;
2318 memcpy(&uk.local, &k->local, sizeof(uk.local));
2319 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2320
2321 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2322 }
2323
2324 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma,
2325 int with_encp)
2326 {
2327 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2328 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2329 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2330 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2331 + userpolicy_type_attrsize();
2332 }
2333
2334 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2335 int num_migrate, const struct xfrm_kmaddress *k,
2336 const struct xfrm_selector *sel,
2337 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2338 {
2339 const struct xfrm_migrate *mp;
2340 struct xfrm_userpolicy_id *pol_id;
2341 struct nlmsghdr *nlh;
2342 int i, err;
2343
2344 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2345 if (nlh == NULL)
2346 return -EMSGSIZE;
2347
2348 pol_id = nlmsg_data(nlh);
2349 /* copy data from selector, dir, and type to the pol_id */
2350 memset(pol_id, 0, sizeof(*pol_id));
2351 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2352 pol_id->dir = dir;
2353
2354 if (k != NULL) {
2355 err = copy_to_user_kmaddress(k, skb);
2356 if (err)
2357 goto out_cancel;
2358 }
2359 if (encap) {
2360 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2361 if (err)
2362 goto out_cancel;
2363 }
2364 err = copy_to_user_policy_type(type, skb);
2365 if (err)
2366 goto out_cancel;
2367 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2368 err = copy_to_user_migrate(mp, skb);
2369 if (err)
2370 goto out_cancel;
2371 }
2372
2373 nlmsg_end(skb, nlh);
2374 return 0;
2375
2376 out_cancel:
2377 nlmsg_cancel(skb, nlh);
2378 return err;
2379 }
2380
2381 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2382 const struct xfrm_migrate *m, int num_migrate,
2383 const struct xfrm_kmaddress *k,
2384 const struct xfrm_encap_tmpl *encap)
2385 {
2386 struct net *net = &init_net;
2387 struct sk_buff *skb;
2388
2389 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2390 GFP_ATOMIC);
2391 if (skb == NULL)
2392 return -ENOMEM;
2393
2394 /* build migrate */
2395 if (build_migrate(skb, m, num_migrate, k, sel, encap, dir, type) < 0)
2396 BUG();
2397
2398 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2399 }
2400 #else
2401 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2402 const struct xfrm_migrate *m, int num_migrate,
2403 const struct xfrm_kmaddress *k,
2404 const struct xfrm_encap_tmpl *encap)
2405 {
2406 return -ENOPROTOOPT;
2407 }
2408 #endif
2409
2410 #define XMSGSIZE(type) sizeof(struct type)
2411
2412 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2413 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2414 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2415 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2416 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2417 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2418 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2419 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2420 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2421 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2422 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2423 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2424 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2425 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2426 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2427 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2428 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2429 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2430 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2431 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2432 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2433 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2434 };
2435
2436 #undef XMSGSIZE
2437
2438 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2439 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2440 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2441 [XFRMA_LASTUSED] = { .type = NLA_U64},
2442 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2443 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2444 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2445 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2446 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2447 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2448 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2449 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2450 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2451 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2452 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2453 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2454 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2455 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2456 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2457 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2458 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2459 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2460 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2461 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2462 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2463 [XFRMA_PROTO] = { .type = NLA_U8 },
2464 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2465 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2466 [XFRMA_OUTPUT_MARK] = { .len = NLA_U32 },
2467 };
2468
2469 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2470 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2471 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2472 };
2473
2474 static const struct xfrm_link {
2475 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2476 int (*dump)(struct sk_buff *, struct netlink_callback *);
2477 int (*done)(struct netlink_callback *);
2478 const struct nla_policy *nla_pol;
2479 int nla_max;
2480 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2481 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2482 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2483 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2484 .dump = xfrm_dump_sa,
2485 .done = xfrm_dump_sa_done },
2486 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2487 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2488 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2489 .dump = xfrm_dump_policy,
2490 .done = xfrm_dump_policy_done },
2491 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2492 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2493 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2494 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2495 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2496 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2497 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2498 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2499 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2500 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2501 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2502 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2503 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2504 .nla_pol = xfrma_spd_policy,
2505 .nla_max = XFRMA_SPD_MAX },
2506 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2507 };
2508
2509 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2510 struct netlink_ext_ack *extack)
2511 {
2512 struct net *net = sock_net(skb->sk);
2513 struct nlattr *attrs[XFRMA_MAX+1];
2514 const struct xfrm_link *link;
2515 int type, err;
2516
2517 #ifdef CONFIG_COMPAT
2518 if (in_compat_syscall())
2519 return -EOPNOTSUPP;
2520 #endif
2521
2522 type = nlh->nlmsg_type;
2523 if (type > XFRM_MSG_MAX)
2524 return -EINVAL;
2525
2526 type -= XFRM_MSG_BASE;
2527 link = &xfrm_dispatch[type];
2528
2529 /* All operations require privileges, even GET */
2530 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2531 return -EPERM;
2532
2533 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2534 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2535 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2536 if (link->dump == NULL)
2537 return -EINVAL;
2538
2539 {
2540 struct netlink_dump_control c = {
2541 .dump = link->dump,
2542 .done = link->done,
2543 };
2544 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2545 }
2546 }
2547
2548 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2549 link->nla_max ? : XFRMA_MAX,
2550 link->nla_pol ? : xfrma_policy, extack);
2551 if (err < 0)
2552 return err;
2553
2554 if (link->doit == NULL)
2555 return -EINVAL;
2556
2557 return link->doit(skb, nlh, attrs);
2558 }
2559
2560 static void xfrm_netlink_rcv(struct sk_buff *skb)
2561 {
2562 struct net *net = sock_net(skb->sk);
2563
2564 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2565 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2566 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2567 }
2568
2569 static inline size_t xfrm_expire_msgsize(void)
2570 {
2571 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2572 + nla_total_size(sizeof(struct xfrm_mark));
2573 }
2574
2575 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2576 {
2577 struct xfrm_user_expire *ue;
2578 struct nlmsghdr *nlh;
2579 int err;
2580
2581 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2582 if (nlh == NULL)
2583 return -EMSGSIZE;
2584
2585 ue = nlmsg_data(nlh);
2586 copy_to_user_state(x, &ue->state);
2587 ue->hard = (c->data.hard != 0) ? 1 : 0;
2588 /* clear the padding bytes */
2589 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2590
2591 err = xfrm_mark_put(skb, &x->mark);
2592 if (err)
2593 return err;
2594
2595 nlmsg_end(skb, nlh);
2596 return 0;
2597 }
2598
2599 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2600 {
2601 struct net *net = xs_net(x);
2602 struct sk_buff *skb;
2603
2604 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2605 if (skb == NULL)
2606 return -ENOMEM;
2607
2608 if (build_expire(skb, x, c) < 0) {
2609 kfree_skb(skb);
2610 return -EMSGSIZE;
2611 }
2612
2613 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2614 }
2615
2616 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2617 {
2618 struct net *net = xs_net(x);
2619 struct sk_buff *skb;
2620
2621 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2622 if (skb == NULL)
2623 return -ENOMEM;
2624
2625 if (build_aevent(skb, x, c) < 0)
2626 BUG();
2627
2628 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2629 }
2630
2631 static int xfrm_notify_sa_flush(const struct km_event *c)
2632 {
2633 struct net *net = c->net;
2634 struct xfrm_usersa_flush *p;
2635 struct nlmsghdr *nlh;
2636 struct sk_buff *skb;
2637 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2638
2639 skb = nlmsg_new(len, GFP_ATOMIC);
2640 if (skb == NULL)
2641 return -ENOMEM;
2642
2643 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2644 if (nlh == NULL) {
2645 kfree_skb(skb);
2646 return -EMSGSIZE;
2647 }
2648
2649 p = nlmsg_data(nlh);
2650 p->proto = c->data.proto;
2651
2652 nlmsg_end(skb, nlh);
2653
2654 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2655 }
2656
2657 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2658 {
2659 size_t l = 0;
2660 if (x->aead)
2661 l += nla_total_size(aead_len(x->aead));
2662 if (x->aalg) {
2663 l += nla_total_size(sizeof(struct xfrm_algo) +
2664 (x->aalg->alg_key_len + 7) / 8);
2665 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2666 }
2667 if (x->ealg)
2668 l += nla_total_size(xfrm_alg_len(x->ealg));
2669 if (x->calg)
2670 l += nla_total_size(sizeof(*x->calg));
2671 if (x->encap)
2672 l += nla_total_size(sizeof(*x->encap));
2673 if (x->tfcpad)
2674 l += nla_total_size(sizeof(x->tfcpad));
2675 if (x->replay_esn)
2676 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2677 else
2678 l += nla_total_size(sizeof(struct xfrm_replay_state));
2679 if (x->security)
2680 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2681 x->security->ctx_len);
2682 if (x->coaddr)
2683 l += nla_total_size(sizeof(*x->coaddr));
2684 if (x->props.extra_flags)
2685 l += nla_total_size(sizeof(x->props.extra_flags));
2686 if (x->xso.dev)
2687 l += nla_total_size(sizeof(x->xso));
2688 if (x->props.output_mark)
2689 l += nla_total_size(sizeof(x->props.output_mark));
2690
2691 /* Must count x->lastused as it may become non-zero behind our back. */
2692 l += nla_total_size_64bit(sizeof(u64));
2693
2694 return l;
2695 }
2696
2697 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2698 {
2699 struct net *net = xs_net(x);
2700 struct xfrm_usersa_info *p;
2701 struct xfrm_usersa_id *id;
2702 struct nlmsghdr *nlh;
2703 struct sk_buff *skb;
2704 int len = xfrm_sa_len(x);
2705 int headlen, err;
2706
2707 headlen = sizeof(*p);
2708 if (c->event == XFRM_MSG_DELSA) {
2709 len += nla_total_size(headlen);
2710 headlen = sizeof(*id);
2711 len += nla_total_size(sizeof(struct xfrm_mark));
2712 }
2713 len += NLMSG_ALIGN(headlen);
2714
2715 skb = nlmsg_new(len, GFP_ATOMIC);
2716 if (skb == NULL)
2717 return -ENOMEM;
2718
2719 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2720 err = -EMSGSIZE;
2721 if (nlh == NULL)
2722 goto out_free_skb;
2723
2724 p = nlmsg_data(nlh);
2725 if (c->event == XFRM_MSG_DELSA) {
2726 struct nlattr *attr;
2727
2728 id = nlmsg_data(nlh);
2729 memset(id, 0, sizeof(*id));
2730 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2731 id->spi = x->id.spi;
2732 id->family = x->props.family;
2733 id->proto = x->id.proto;
2734
2735 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2736 err = -EMSGSIZE;
2737 if (attr == NULL)
2738 goto out_free_skb;
2739
2740 p = nla_data(attr);
2741 }
2742 err = copy_to_user_state_extra(x, p, skb);
2743 if (err)
2744 goto out_free_skb;
2745
2746 nlmsg_end(skb, nlh);
2747
2748 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2749
2750 out_free_skb:
2751 kfree_skb(skb);
2752 return err;
2753 }
2754
2755 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2756 {
2757
2758 switch (c->event) {
2759 case XFRM_MSG_EXPIRE:
2760 return xfrm_exp_state_notify(x, c);
2761 case XFRM_MSG_NEWAE:
2762 return xfrm_aevent_state_notify(x, c);
2763 case XFRM_MSG_DELSA:
2764 case XFRM_MSG_UPDSA:
2765 case XFRM_MSG_NEWSA:
2766 return xfrm_notify_sa(x, c);
2767 case XFRM_MSG_FLUSHSA:
2768 return xfrm_notify_sa_flush(c);
2769 default:
2770 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2771 c->event);
2772 break;
2773 }
2774
2775 return 0;
2776
2777 }
2778
2779 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2780 struct xfrm_policy *xp)
2781 {
2782 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2783 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2784 + nla_total_size(sizeof(struct xfrm_mark))
2785 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2786 + userpolicy_type_attrsize();
2787 }
2788
2789 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2790 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2791 {
2792 __u32 seq = xfrm_get_acqseq();
2793 struct xfrm_user_acquire *ua;
2794 struct nlmsghdr *nlh;
2795 int err;
2796
2797 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2798 if (nlh == NULL)
2799 return -EMSGSIZE;
2800
2801 ua = nlmsg_data(nlh);
2802 memcpy(&ua->id, &x->id, sizeof(ua->id));
2803 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2804 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2805 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2806 ua->aalgos = xt->aalgos;
2807 ua->ealgos = xt->ealgos;
2808 ua->calgos = xt->calgos;
2809 ua->seq = x->km.seq = seq;
2810
2811 err = copy_to_user_tmpl(xp, skb);
2812 if (!err)
2813 err = copy_to_user_state_sec_ctx(x, skb);
2814 if (!err)
2815 err = copy_to_user_policy_type(xp->type, skb);
2816 if (!err)
2817 err = xfrm_mark_put(skb, &xp->mark);
2818 if (err) {
2819 nlmsg_cancel(skb, nlh);
2820 return err;
2821 }
2822
2823 nlmsg_end(skb, nlh);
2824 return 0;
2825 }
2826
2827 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2828 struct xfrm_policy *xp)
2829 {
2830 struct net *net = xs_net(x);
2831 struct sk_buff *skb;
2832
2833 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2834 if (skb == NULL)
2835 return -ENOMEM;
2836
2837 if (build_acquire(skb, x, xt, xp) < 0)
2838 BUG();
2839
2840 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2841 }
2842
2843 /* User gives us xfrm_user_policy_info followed by an array of 0
2844 * or more templates.
2845 */
2846 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2847 u8 *data, int len, int *dir)
2848 {
2849 struct net *net = sock_net(sk);
2850 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2851 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2852 struct xfrm_policy *xp;
2853 int nr;
2854
2855 switch (sk->sk_family) {
2856 case AF_INET:
2857 if (opt != IP_XFRM_POLICY) {
2858 *dir = -EOPNOTSUPP;
2859 return NULL;
2860 }
2861 break;
2862 #if IS_ENABLED(CONFIG_IPV6)
2863 case AF_INET6:
2864 if (opt != IPV6_XFRM_POLICY) {
2865 *dir = -EOPNOTSUPP;
2866 return NULL;
2867 }
2868 break;
2869 #endif
2870 default:
2871 *dir = -EINVAL;
2872 return NULL;
2873 }
2874
2875 *dir = -EINVAL;
2876
2877 if (len < sizeof(*p) ||
2878 verify_newpolicy_info(p))
2879 return NULL;
2880
2881 nr = ((len - sizeof(*p)) / sizeof(*ut));
2882 if (validate_tmpl(nr, ut, p->sel.family))
2883 return NULL;
2884
2885 if (p->dir > XFRM_POLICY_OUT)
2886 return NULL;
2887
2888 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2889 if (xp == NULL) {
2890 *dir = -ENOBUFS;
2891 return NULL;
2892 }
2893
2894 copy_from_user_policy(xp, p);
2895 xp->type = XFRM_POLICY_TYPE_MAIN;
2896 copy_templates(xp, ut, nr);
2897
2898 *dir = p->dir;
2899
2900 return xp;
2901 }
2902
2903 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2904 {
2905 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2906 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2907 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2908 + nla_total_size(sizeof(struct xfrm_mark))
2909 + userpolicy_type_attrsize();
2910 }
2911
2912 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2913 int dir, const struct km_event *c)
2914 {
2915 struct xfrm_user_polexpire *upe;
2916 int hard = c->data.hard;
2917 struct nlmsghdr *nlh;
2918 int err;
2919
2920 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2921 if (nlh == NULL)
2922 return -EMSGSIZE;
2923
2924 upe = nlmsg_data(nlh);
2925 copy_to_user_policy(xp, &upe->pol, dir);
2926 err = copy_to_user_tmpl(xp, skb);
2927 if (!err)
2928 err = copy_to_user_sec_ctx(xp, skb);
2929 if (!err)
2930 err = copy_to_user_policy_type(xp->type, skb);
2931 if (!err)
2932 err = xfrm_mark_put(skb, &xp->mark);
2933 if (err) {
2934 nlmsg_cancel(skb, nlh);
2935 return err;
2936 }
2937 upe->hard = !!hard;
2938
2939 nlmsg_end(skb, nlh);
2940 return 0;
2941 }
2942
2943 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2944 {
2945 struct net *net = xp_net(xp);
2946 struct sk_buff *skb;
2947
2948 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2949 if (skb == NULL)
2950 return -ENOMEM;
2951
2952 if (build_polexpire(skb, xp, dir, c) < 0)
2953 BUG();
2954
2955 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2956 }
2957
2958 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2959 {
2960 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2961 struct net *net = xp_net(xp);
2962 struct xfrm_userpolicy_info *p;
2963 struct xfrm_userpolicy_id *id;
2964 struct nlmsghdr *nlh;
2965 struct sk_buff *skb;
2966 int headlen, err;
2967
2968 headlen = sizeof(*p);
2969 if (c->event == XFRM_MSG_DELPOLICY) {
2970 len += nla_total_size(headlen);
2971 headlen = sizeof(*id);
2972 }
2973 len += userpolicy_type_attrsize();
2974 len += nla_total_size(sizeof(struct xfrm_mark));
2975 len += NLMSG_ALIGN(headlen);
2976
2977 skb = nlmsg_new(len, GFP_ATOMIC);
2978 if (skb == NULL)
2979 return -ENOMEM;
2980
2981 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2982 err = -EMSGSIZE;
2983 if (nlh == NULL)
2984 goto out_free_skb;
2985
2986 p = nlmsg_data(nlh);
2987 if (c->event == XFRM_MSG_DELPOLICY) {
2988 struct nlattr *attr;
2989
2990 id = nlmsg_data(nlh);
2991 memset(id, 0, sizeof(*id));
2992 id->dir = dir;
2993 if (c->data.byid)
2994 id->index = xp->index;
2995 else
2996 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2997
2998 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2999 err = -EMSGSIZE;
3000 if (attr == NULL)
3001 goto out_free_skb;
3002
3003 p = nla_data(attr);
3004 }
3005
3006 copy_to_user_policy(xp, p, dir);
3007 err = copy_to_user_tmpl(xp, skb);
3008 if (!err)
3009 err = copy_to_user_policy_type(xp->type, skb);
3010 if (!err)
3011 err = xfrm_mark_put(skb, &xp->mark);
3012 if (err)
3013 goto out_free_skb;
3014
3015 nlmsg_end(skb, nlh);
3016
3017 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3018
3019 out_free_skb:
3020 kfree_skb(skb);
3021 return err;
3022 }
3023
3024 static int xfrm_notify_policy_flush(const struct km_event *c)
3025 {
3026 struct net *net = c->net;
3027 struct nlmsghdr *nlh;
3028 struct sk_buff *skb;
3029 int err;
3030
3031 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3032 if (skb == NULL)
3033 return -ENOMEM;
3034
3035 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3036 err = -EMSGSIZE;
3037 if (nlh == NULL)
3038 goto out_free_skb;
3039 err = copy_to_user_policy_type(c->data.type, skb);
3040 if (err)
3041 goto out_free_skb;
3042
3043 nlmsg_end(skb, nlh);
3044
3045 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3046
3047 out_free_skb:
3048 kfree_skb(skb);
3049 return err;
3050 }
3051
3052 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3053 {
3054
3055 switch (c->event) {
3056 case XFRM_MSG_NEWPOLICY:
3057 case XFRM_MSG_UPDPOLICY:
3058 case XFRM_MSG_DELPOLICY:
3059 return xfrm_notify_policy(xp, dir, c);
3060 case XFRM_MSG_FLUSHPOLICY:
3061 return xfrm_notify_policy_flush(c);
3062 case XFRM_MSG_POLEXPIRE:
3063 return xfrm_exp_policy_notify(xp, dir, c);
3064 default:
3065 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3066 c->event);
3067 }
3068
3069 return 0;
3070
3071 }
3072
3073 static inline size_t xfrm_report_msgsize(void)
3074 {
3075 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3076 }
3077
3078 static int build_report(struct sk_buff *skb, u8 proto,
3079 struct xfrm_selector *sel, xfrm_address_t *addr)
3080 {
3081 struct xfrm_user_report *ur;
3082 struct nlmsghdr *nlh;
3083
3084 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3085 if (nlh == NULL)
3086 return -EMSGSIZE;
3087
3088 ur = nlmsg_data(nlh);
3089 ur->proto = proto;
3090 memcpy(&ur->sel, sel, sizeof(ur->sel));
3091
3092 if (addr) {
3093 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3094 if (err) {
3095 nlmsg_cancel(skb, nlh);
3096 return err;
3097 }
3098 }
3099 nlmsg_end(skb, nlh);
3100 return 0;
3101 }
3102
3103 static int xfrm_send_report(struct net *net, u8 proto,
3104 struct xfrm_selector *sel, xfrm_address_t *addr)
3105 {
3106 struct sk_buff *skb;
3107
3108 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3109 if (skb == NULL)
3110 return -ENOMEM;
3111
3112 if (build_report(skb, proto, sel, addr) < 0)
3113 BUG();
3114
3115 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3116 }
3117
3118 static inline size_t xfrm_mapping_msgsize(void)
3119 {
3120 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3121 }
3122
3123 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3124 xfrm_address_t *new_saddr, __be16 new_sport)
3125 {
3126 struct xfrm_user_mapping *um;
3127 struct nlmsghdr *nlh;
3128
3129 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3130 if (nlh == NULL)
3131 return -EMSGSIZE;
3132
3133 um = nlmsg_data(nlh);
3134
3135 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3136 um->id.spi = x->id.spi;
3137 um->id.family = x->props.family;
3138 um->id.proto = x->id.proto;
3139 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3140 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3141 um->new_sport = new_sport;
3142 um->old_sport = x->encap->encap_sport;
3143 um->reqid = x->props.reqid;
3144
3145 nlmsg_end(skb, nlh);
3146 return 0;
3147 }
3148
3149 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3150 __be16 sport)
3151 {
3152 struct net *net = xs_net(x);
3153 struct sk_buff *skb;
3154
3155 if (x->id.proto != IPPROTO_ESP)
3156 return -EINVAL;
3157
3158 if (!x->encap)
3159 return -EINVAL;
3160
3161 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3162 if (skb == NULL)
3163 return -ENOMEM;
3164
3165 if (build_mapping(skb, x, ipaddr, sport) < 0)
3166 BUG();
3167
3168 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3169 }
3170
3171 static bool xfrm_is_alive(const struct km_event *c)
3172 {
3173 return (bool)xfrm_acquire_is_on(c->net);
3174 }
3175
3176 static struct xfrm_mgr netlink_mgr = {
3177 .notify = xfrm_send_state_notify,
3178 .acquire = xfrm_send_acquire,
3179 .compile_policy = xfrm_compile_policy,
3180 .notify_policy = xfrm_send_policy_notify,
3181 .report = xfrm_send_report,
3182 .migrate = xfrm_send_migrate,
3183 .new_mapping = xfrm_send_mapping,
3184 .is_alive = xfrm_is_alive,
3185 };
3186
3187 static int __net_init xfrm_user_net_init(struct net *net)
3188 {
3189 struct sock *nlsk;
3190 struct netlink_kernel_cfg cfg = {
3191 .groups = XFRMNLGRP_MAX,
3192 .input = xfrm_netlink_rcv,
3193 };
3194
3195 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3196 if (nlsk == NULL)
3197 return -ENOMEM;
3198 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3199 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3200 return 0;
3201 }
3202
3203 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3204 {
3205 struct net *net;
3206 list_for_each_entry(net, net_exit_list, exit_list)
3207 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3208 synchronize_net();
3209 list_for_each_entry(net, net_exit_list, exit_list)
3210 netlink_kernel_release(net->xfrm.nlsk_stash);
3211 }
3212
3213 static struct pernet_operations xfrm_user_net_ops = {
3214 .init = xfrm_user_net_init,
3215 .exit_batch = xfrm_user_net_exit,
3216 };
3217
3218 static int __init xfrm_user_init(void)
3219 {
3220 int rv;
3221
3222 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3223
3224 rv = register_pernet_subsys(&xfrm_user_net_ops);
3225 if (rv < 0)
3226 return rv;
3227 rv = xfrm_register_km(&netlink_mgr);
3228 if (rv < 0)
3229 unregister_pernet_subsys(&xfrm_user_net_ops);
3230 return rv;
3231 }
3232
3233 static void __exit xfrm_user_exit(void)
3234 {
3235 xfrm_unregister_km(&netlink_mgr);
3236 unregister_pernet_subsys(&xfrm_user_net_ops);
3237 }
3238
3239 module_init(xfrm_user_init);
3240 module_exit(xfrm_user_exit);
3241 MODULE_LICENSE("GPL");
3242 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3243
Linux with added FPC-III support