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192.168.1.100 / T108 / 50f43abd51b98a89a2ec2d51cd2725a28869fae6 / . / marvell / linux / net / xfrm / xfrm_user.c
blob: fdc0c9021728d9fb25c5cac96e0eac3bbf60265b [file] [log] [blame]
b.liue9582032025-04-17 19:18:16 +0800[diff] [blame]1// SPDX-License-Identifier: GPL-2.0-only
2/* xfrm_user.c: User interface to configure xfrm engine.
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 *
6 * Changes:
7 * Mitsuru KANDA @USAGI
8 * Kazunori MIYAZAWA @USAGI
9 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * IPv6 support
11 *
12 */
13
14#include <linux/crypto.h>
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/socket.h>
20#include <linux/string.h>
21#include <linux/net.h>
22#include <linux/skbuff.h>
23#include <linux/pfkeyv2.h>
24#include <linux/ipsec.h>
25#include <linux/init.h>
26#include <linux/security.h>
27#include <net/sock.h>
28#include <net/xfrm.h>
29#include <net/netlink.h>
30#include <net/ah.h>
31#include <linux/uaccess.h>
32#if IS_ENABLED(CONFIG_IPV6)
33#include <linux/in6.h>
34#endif
35#include <asm/unaligned.h>
36
37static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
38{
39 struct nlattr *rt = attrs[type];
40 struct xfrm_algo *algp;
41
42 if (!rt)
43 return 0;
44
45 algp = nla_data(rt);
46 if (nla_len(rt) < (int)xfrm_alg_len(algp))
47 return -EINVAL;
48
49 switch (type) {
50 case XFRMA_ALG_AUTH:
51 case XFRMA_ALG_CRYPT:
52 case XFRMA_ALG_COMP:
53 break;
54
55 default:
56 return -EINVAL;
57 }
58
59 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
60 return 0;
61}
62
63static int verify_auth_trunc(struct nlattr **attrs)
64{
65 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
66 struct xfrm_algo_auth *algp;
67
68 if (!rt)
69 return 0;
70
71 algp = nla_data(rt);
72 if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
73 return -EINVAL;
74
75 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
76 return 0;
77}
78
79static int verify_aead(struct nlattr **attrs)
80{
81 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
82 struct xfrm_algo_aead *algp;
83
84 if (!rt)
85 return 0;
86
87 algp = nla_data(rt);
88 if (nla_len(rt) < (int)aead_len(algp))
89 return -EINVAL;
90
91 algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';
92 return 0;
93}
94
95static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
96 xfrm_address_t **addrp)
97{
98 struct nlattr *rt = attrs[type];
99
100 if (rt && addrp)
101 *addrp = nla_data(rt);
102}
103
104static inline int verify_sec_ctx_len(struct nlattr **attrs)
105{
106 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
107 struct xfrm_user_sec_ctx *uctx;
108
109 if (!rt)
110 return 0;
111
112 uctx = nla_data(rt);
113 if (uctx->len > nla_len(rt) ||
114 uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
115 return -EINVAL;
116
117 return 0;
118}
119
120static inline int verify_replay(struct xfrm_usersa_info *p,
121 struct nlattr **attrs)
122{
123 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
124 struct xfrm_replay_state_esn *rs;
125
126 if (!rt)
127 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
128
129 rs = nla_data(rt);
130
131 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
132 return -EINVAL;
133
134 if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
135 nla_len(rt) != sizeof(*rs))
136 return -EINVAL;
137
138 /* As only ESP and AH support ESN feature. */
139 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
140 return -EINVAL;
141
142 if (p->replay_window != 0)
143 return -EINVAL;
144
145 return 0;
146}
147
148static int verify_newsa_info(struct xfrm_usersa_info *p,
149 struct nlattr **attrs)
150{
151 int err;
152 u16 family = p->sel.family;
153
154 err = -EINVAL;
155 switch (p->family) {
156 case AF_INET:
157 break;
158
159 case AF_INET6:
160#if IS_ENABLED(CONFIG_IPV6)
161 break;
162#else
163 err = -EAFNOSUPPORT;
164 goto out;
165#endif
166
167 default:
168 goto out;
169 }
170
171 if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
172 family = p->family;
173
174 switch (family) {
175 case AF_UNSPEC:
176 break;
177
178 case AF_INET:
179 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
180 goto out;
181
182 break;
183
184 case AF_INET6:
185#if IS_ENABLED(CONFIG_IPV6)
186 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
187 goto out;
188
189 break;
190#else
191 err = -EAFNOSUPPORT;
192 goto out;
193#endif
194
195 default:
196 goto out;
197 }
198
199 err = -EINVAL;
200 switch (p->id.proto) {
201 case IPPROTO_AH:
202 if ((!attrs[XFRMA_ALG_AUTH] &&
203 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
204 attrs[XFRMA_ALG_AEAD] ||
205 attrs[XFRMA_ALG_CRYPT] ||
206 attrs[XFRMA_ALG_COMP] ||
207 attrs[XFRMA_TFCPAD])
208 goto out;
209 break;
210
211 case IPPROTO_ESP:
212 if (attrs[XFRMA_ALG_COMP])
213 goto out;
214 if (!attrs[XFRMA_ALG_AUTH] &&
215 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
216 !attrs[XFRMA_ALG_CRYPT] &&
217 !attrs[XFRMA_ALG_AEAD])
218 goto out;
219 if ((attrs[XFRMA_ALG_AUTH] ||
220 attrs[XFRMA_ALG_AUTH_TRUNC] ||
221 attrs[XFRMA_ALG_CRYPT]) &&
222 attrs[XFRMA_ALG_AEAD])
223 goto out;
224 if (attrs[XFRMA_TFCPAD] &&
225 p->mode != XFRM_MODE_TUNNEL)
226 goto out;
227 break;
228
229 case IPPROTO_COMP:
230 if (!attrs[XFRMA_ALG_COMP] ||
231 attrs[XFRMA_ALG_AEAD] ||
232 attrs[XFRMA_ALG_AUTH] ||
233 attrs[XFRMA_ALG_AUTH_TRUNC] ||
234 attrs[XFRMA_ALG_CRYPT] ||
235 attrs[XFRMA_TFCPAD] ||
236 (ntohl(p->id.spi) >= 0x10000))
237 goto out;
238 break;
239
240#if IS_ENABLED(CONFIG_IPV6)
241 case IPPROTO_DSTOPTS:
242 case IPPROTO_ROUTING:
243 if (attrs[XFRMA_ALG_COMP] ||
244 attrs[XFRMA_ALG_AUTH] ||
245 attrs[XFRMA_ALG_AUTH_TRUNC] ||
246 attrs[XFRMA_ALG_AEAD] ||
247 attrs[XFRMA_ALG_CRYPT] ||
248 attrs[XFRMA_ENCAP] ||
249 attrs[XFRMA_SEC_CTX] ||
250 attrs[XFRMA_TFCPAD] ||
251 !attrs[XFRMA_COADDR])
252 goto out;
253 break;
254#endif
255
256 default:
257 goto out;
258 }
259
260 if ((err = verify_aead(attrs)))
261 goto out;
262 if ((err = verify_auth_trunc(attrs)))
263 goto out;
264 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
265 goto out;
266 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
267 goto out;
268 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
269 goto out;
270 if ((err = verify_sec_ctx_len(attrs)))
271 goto out;
272 if ((err = verify_replay(p, attrs)))
273 goto out;
274
275 err = -EINVAL;
276 switch (p->mode) {
277 case XFRM_MODE_TRANSPORT:
278 case XFRM_MODE_TUNNEL:
279 case XFRM_MODE_ROUTEOPTIMIZATION:
280 case XFRM_MODE_BEET:
281 break;
282
283 default:
284 goto out;
285 }
286
287 err = 0;
288
289out:
290 return err;
291}
292
293static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
294 struct xfrm_algo_desc *(*get_byname)(const char *, int),
295 struct nlattr *rta)
296{
297 struct xfrm_algo *p, *ualg;
298 struct xfrm_algo_desc *algo;
299
300 if (!rta)
301 return 0;
302
303 ualg = nla_data(rta);
304
305 algo = get_byname(ualg->alg_name, 1);
306 if (!algo)
307 return -ENOSYS;
308 *props = algo->desc.sadb_alg_id;
309
310 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
311 if (!p)
312 return -ENOMEM;
313
314 strcpy(p->alg_name, algo->name);
315 *algpp = p;
316 return 0;
317}
318
319static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
320{
321 struct xfrm_algo *p, *ualg;
322 struct xfrm_algo_desc *algo;
323
324 if (!rta)
325 return 0;
326
327 ualg = nla_data(rta);
328
329 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
330 if (!algo)
331 return -ENOSYS;
332 x->props.ealgo = algo->desc.sadb_alg_id;
333
334 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
335 if (!p)
336 return -ENOMEM;
337
338 strcpy(p->alg_name, algo->name);
339 x->ealg = p;
340 x->geniv = algo->uinfo.encr.geniv;
341 return 0;
342}
343
344static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
345 struct nlattr *rta)
346{
347 struct xfrm_algo *ualg;
348 struct xfrm_algo_auth *p;
349 struct xfrm_algo_desc *algo;
350
351 if (!rta)
352 return 0;
353
354 ualg = nla_data(rta);
355
356 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
357 if (!algo)
358 return -ENOSYS;
359 *props = algo->desc.sadb_alg_id;
360
361 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
362 if (!p)
363 return -ENOMEM;
364
365 strcpy(p->alg_name, algo->name);
366 p->alg_key_len = ualg->alg_key_len;
367 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
368 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
369
370 *algpp = p;
371 return 0;
372}
373
374static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
375 struct nlattr *rta)
376{
377 struct xfrm_algo_auth *p, *ualg;
378 struct xfrm_algo_desc *algo;
379
380 if (!rta)
381 return 0;
382
383 ualg = nla_data(rta);
384
385 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
386 if (!algo)
387 return -ENOSYS;
388 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
389 return -EINVAL;
390 *props = algo->desc.sadb_alg_id;
391
392 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
393 if (!p)
394 return -ENOMEM;
395
396 strcpy(p->alg_name, algo->name);
397 if (!p->alg_trunc_len)
398 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
399
400 *algpp = p;
401 return 0;
402}
403
404static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
405{
406 struct xfrm_algo_aead *p, *ualg;
407 struct xfrm_algo_desc *algo;
408
409 if (!rta)
410 return 0;
411
412 ualg = nla_data(rta);
413
414 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
415 if (!algo)
416 return -ENOSYS;
417 x->props.ealgo = algo->desc.sadb_alg_id;
418
419 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
420 if (!p)
421 return -ENOMEM;
422
423 strcpy(p->alg_name, algo->name);
424 x->aead = p;
425 x->geniv = algo->uinfo.aead.geniv;
426 return 0;
427}
428
429static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
430 struct nlattr *rp)
431{
432 struct xfrm_replay_state_esn *up;
433 unsigned int ulen;
434
435 if (!replay_esn || !rp)
436 return 0;
437
438 up = nla_data(rp);
439 ulen = xfrm_replay_state_esn_len(up);
440
441 /* Check the overall length and the internal bitmap length to avoid
442 * potential overflow. */
443 if (nla_len(rp) < (int)ulen ||
444 xfrm_replay_state_esn_len(replay_esn) != ulen ||
445 replay_esn->bmp_len != up->bmp_len)
446 return -EINVAL;
447
448 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
449 return -EINVAL;
450
451 return 0;
452}
453
454static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
455 struct xfrm_replay_state_esn **preplay_esn,
456 struct nlattr *rta)
457{
458 struct xfrm_replay_state_esn *p, *pp, *up;
459 unsigned int klen, ulen;
460
461 if (!rta)
462 return 0;
463
464 up = nla_data(rta);
465 klen = xfrm_replay_state_esn_len(up);
466 ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
467
468 p = kzalloc(klen, GFP_KERNEL);
469 if (!p)
470 return -ENOMEM;
471
472 pp = kzalloc(klen, GFP_KERNEL);
473 if (!pp) {
474 kfree(p);
475 return -ENOMEM;
476 }
477
478 memcpy(p, up, ulen);
479 memcpy(pp, up, ulen);
480
481 *replay_esn = p;
482 *preplay_esn = pp;
483
484 return 0;
485}
486
487static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
488{
489 unsigned int len = 0;
490
491 if (xfrm_ctx) {
492 len += sizeof(struct xfrm_user_sec_ctx);
493 len += xfrm_ctx->ctx_len;
494 }
495 return len;
496}
497
498static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
499{
500 memcpy(&x->id, &p->id, sizeof(x->id));
501 memcpy(&x->sel, &p->sel, sizeof(x->sel));
502 memcpy(&x->lft, &p->lft, sizeof(x->lft));
503 x->props.mode = p->mode;
504 x->props.replay_window = min_t(unsigned int, p->replay_window,
505 sizeof(x->replay.bitmap) * 8);
506 x->props.reqid = p->reqid;
507 x->props.family = p->family;
508 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
509 x->props.flags = p->flags;
510
511 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
512 x->sel.family = p->family;
513}
514
515/*
516 * someday when pfkey also has support, we could have the code
517 * somehow made shareable and move it to xfrm_state.c - JHS
518 *
519*/
520static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
521 int update_esn)
522{
523 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
524 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
525 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
526 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
527 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
528
529 if (re && x->replay_esn && x->preplay_esn) {
530 struct xfrm_replay_state_esn *replay_esn;
531 replay_esn = nla_data(re);
532 memcpy(x->replay_esn, replay_esn,
533 xfrm_replay_state_esn_len(replay_esn));
534 memcpy(x->preplay_esn, replay_esn,
535 xfrm_replay_state_esn_len(replay_esn));
536 }
537
538 if (rp) {
539 struct xfrm_replay_state *replay;
540 replay = nla_data(rp);
541 memcpy(&x->replay, replay, sizeof(*replay));
542 memcpy(&x->preplay, replay, sizeof(*replay));
543 }
544
545 if (lt) {
546 struct xfrm_lifetime_cur *ltime;
547 ltime = nla_data(lt);
548 x->curlft.bytes = ltime->bytes;
549 x->curlft.packets = ltime->packets;
550 x->curlft.add_time = ltime->add_time;
551 x->curlft.use_time = ltime->use_time;
552 }
553
554 if (et)
555 x->replay_maxage = nla_get_u32(et);
556
557 if (rt)
558 x->replay_maxdiff = nla_get_u32(rt);
559}
560
561static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m)
562{
563 if (attrs[XFRMA_SET_MARK]) {
564 m->v = nla_get_u32(attrs[XFRMA_SET_MARK]);
565 if (attrs[XFRMA_SET_MARK_MASK])
566 m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]);
567 else
568 m->m = 0xffffffff;
569 } else {
570 m->v = m->m = 0;
571 }
572}
573
574static struct xfrm_state *xfrm_state_construct(struct net *net,
575 struct xfrm_usersa_info *p,
576 struct nlattr **attrs,
577 int *errp)
578{
579 struct xfrm_state *x = xfrm_state_alloc(net);
580 int err = -ENOMEM;
581
582 if (!x)
583 goto error_no_put;
584
585 copy_from_user_state(x, p);
586
587 if (attrs[XFRMA_ENCAP]) {
588 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
589 sizeof(*x->encap), GFP_KERNEL);
590 if (x->encap == NULL)
591 goto error;
592 }
593
594 if (attrs[XFRMA_COADDR]) {
595 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
596 sizeof(*x->coaddr), GFP_KERNEL);
597 if (x->coaddr == NULL)
598 goto error;
599 }
600
601 if (attrs[XFRMA_SA_EXTRA_FLAGS])
602 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
603
604 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
605 goto error;
606 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
607 attrs[XFRMA_ALG_AUTH_TRUNC])))
608 goto error;
609 if (!x->props.aalgo) {
610 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
611 attrs[XFRMA_ALG_AUTH])))
612 goto error;
613 }
614 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
615 goto error;
616 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
617 xfrm_calg_get_byname,
618 attrs[XFRMA_ALG_COMP])))
619 goto error;
620
621 if (attrs[XFRMA_TFCPAD])
622 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
623
624 xfrm_mark_get(attrs, &x->mark);
625
626 xfrm_smark_init(attrs, &x->props.smark);
627
628 if (attrs[XFRMA_IF_ID])
629 x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
630
631 err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
632 if (err)
633 goto error;
634
635 if (attrs[XFRMA_SEC_CTX]) {
636 err = security_xfrm_state_alloc(x,
637 nla_data(attrs[XFRMA_SEC_CTX]));
638 if (err)
639 goto error;
640 }
641
642 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
643 attrs[XFRMA_REPLAY_ESN_VAL])))
644 goto error;
645
646 x->km.seq = p->seq;
647 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
648 /* sysctl_xfrm_aevent_etime is in 100ms units */
649 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
650
651 if ((err = xfrm_init_replay(x)))
652 goto error;
653
654 /* override default values from above */
655 xfrm_update_ae_params(x, attrs, 0);
656
657 /* configure the hardware if offload is requested */
658 if (attrs[XFRMA_OFFLOAD_DEV]) {
659 err = xfrm_dev_state_add(net, x,
660 nla_data(attrs[XFRMA_OFFLOAD_DEV]));
661 if (err)
662 goto error;
663 }
664
665 return x;
666
667error:
668 x->km.state = XFRM_STATE_DEAD;
669 xfrm_state_put(x);
670error_no_put:
671 *errp = err;
672 return NULL;
673}
674
675static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
676 struct nlattr **attrs)
677{
678 struct net *net = sock_net(skb->sk);
679 struct xfrm_usersa_info *p = nlmsg_data(nlh);
680 struct xfrm_state *x;
681 int err;
682 struct km_event c;
683
684 err = verify_newsa_info(p, attrs);
685 if (err)
686 return err;
687
688 x = xfrm_state_construct(net, p, attrs, &err);
689 if (!x)
690 return err;
691
692 xfrm_state_hold(x);
693 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
694 err = xfrm_state_add(x);
695 else
696 err = xfrm_state_update(x);
697
698 xfrm_audit_state_add(x, err ? 0 : 1, true);
699
700 if (err < 0) {
701 x->km.state = XFRM_STATE_DEAD;
702 xfrm_dev_state_delete(x);
703 __xfrm_state_put(x);
704 goto out;
705 }
706
707 if (x->km.state == XFRM_STATE_VOID)
708 x->km.state = XFRM_STATE_VALID;
709
710 c.seq = nlh->nlmsg_seq;
711 c.portid = nlh->nlmsg_pid;
712 c.event = nlh->nlmsg_type;
713
714 km_state_notify(x, &c);
715out:
716 xfrm_state_put(x);
717 return err;
718}
719
720static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
721 struct xfrm_usersa_id *p,
722 struct nlattr **attrs,
723 int *errp)
724{
725 struct xfrm_state *x = NULL;
726 struct xfrm_mark m;
727 int err;
728 u32 mark = xfrm_mark_get(attrs, &m);
729
730 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
731 err = -ESRCH;
732 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
733 } else {
734 xfrm_address_t *saddr = NULL;
735
736 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
737 if (!saddr) {
738 err = -EINVAL;
739 goto out;
740 }
741
742 err = -ESRCH;
743 x = xfrm_state_lookup_byaddr(net, mark,
744 &p->daddr, saddr,
745 p->proto, p->family);
746 }
747
748 out:
749 if (!x && errp)
750 *errp = err;
751 return x;
752}
753
754static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
755 struct nlattr **attrs)
756{
757 struct net *net = sock_net(skb->sk);
758 struct xfrm_state *x;
759 int err = -ESRCH;
760 struct km_event c;
761 struct xfrm_usersa_id *p = nlmsg_data(nlh);
762
763 x = xfrm_user_state_lookup(net, p, attrs, &err);
764 if (x == NULL)
765 return err;
766
767 if ((err = security_xfrm_state_delete(x)) != 0)
768 goto out;
769
770 if (xfrm_state_kern(x)) {
771 err = -EPERM;
772 goto out;
773 }
774
775 err = xfrm_state_delete(x);
776
777 if (err < 0)
778 goto out;
779
780 c.seq = nlh->nlmsg_seq;
781 c.portid = nlh->nlmsg_pid;
782 c.event = nlh->nlmsg_type;
783 km_state_notify(x, &c);
784
785out:
786 xfrm_audit_state_delete(x, err ? 0 : 1, true);
787 xfrm_state_put(x);
788 return err;
789}
790
791static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
792{
793 memset(p, 0, sizeof(*p));
794 memcpy(&p->id, &x->id, sizeof(p->id));
795 memcpy(&p->sel, &x->sel, sizeof(p->sel));
796 memcpy(&p->lft, &x->lft, sizeof(p->lft));
797 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
798 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
799 put_unaligned(x->stats.replay, &p->stats.replay);
800 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
801 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
802 p->mode = x->props.mode;
803 p->replay_window = x->props.replay_window;
804 p->reqid = x->props.reqid;
805 p->family = x->props.family;
806 p->flags = x->props.flags;
807 p->seq = x->km.seq;
808}
809
810struct xfrm_dump_info {
811 struct sk_buff *in_skb;
812 struct sk_buff *out_skb;
813 u32 nlmsg_seq;
814 u16 nlmsg_flags;
815};
816
817static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
818{
819 struct xfrm_user_sec_ctx *uctx;
820 struct nlattr *attr;
821 int ctx_size = sizeof(*uctx) + s->ctx_len;
822
823 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
824 if (attr == NULL)
825 return -EMSGSIZE;
826
827 uctx = nla_data(attr);
828 uctx->exttype = XFRMA_SEC_CTX;
829 uctx->len = ctx_size;
830 uctx->ctx_doi = s->ctx_doi;
831 uctx->ctx_alg = s->ctx_alg;
832 uctx->ctx_len = s->ctx_len;
833 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
834
835 return 0;
836}
837
838static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
839{
840 struct xfrm_user_offload *xuo;
841 struct nlattr *attr;
842
843 attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
844 if (attr == NULL)
845 return -EMSGSIZE;
846
847 xuo = nla_data(attr);
848 memset(xuo, 0, sizeof(*xuo));
849 xuo->ifindex = xso->dev->ifindex;
850 xuo->flags = xso->flags;
851
852 return 0;
853}
854
855static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
856{
857 struct xfrm_algo *algo;
858 struct nlattr *nla;
859
860 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
861 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
862 if (!nla)
863 return -EMSGSIZE;
864
865 algo = nla_data(nla);
866 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
867 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
868 algo->alg_key_len = auth->alg_key_len;
869
870 return 0;
871}
872
873static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m)
874{
875 int ret = 0;
876
877 if (m->v | m->m) {
878 ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v);
879 if (!ret)
880 ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m);
881 }
882 return ret;
883}
884
885/* Don't change this without updating xfrm_sa_len! */
886static int copy_to_user_state_extra(struct xfrm_state *x,
887 struct xfrm_usersa_info *p,
888 struct sk_buff *skb)
889{
890 int ret = 0;
891
892 copy_to_user_state(x, p);
893
894 if (x->props.extra_flags) {
895 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
896 x->props.extra_flags);
897 if (ret)
898 goto out;
899 }
900
901 if (x->coaddr) {
902 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
903 if (ret)
904 goto out;
905 }
906 if (x->lastused) {
907 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
908 XFRMA_PAD);
909 if (ret)
910 goto out;
911 }
912 if (x->aead) {
913 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
914 if (ret)
915 goto out;
916 }
917 if (x->aalg) {
918 ret = copy_to_user_auth(x->aalg, skb);
919 if (!ret)
920 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
921 xfrm_alg_auth_len(x->aalg), x->aalg);
922 if (ret)
923 goto out;
924 }
925 if (x->ealg) {
926 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
927 if (ret)
928 goto out;
929 }
930 if (x->calg) {
931 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
932 if (ret)
933 goto out;
934 }
935 if (x->encap) {
936 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
937 if (ret)
938 goto out;
939 }
940 if (x->tfcpad) {
941 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
942 if (ret)
943 goto out;
944 }
945 ret = xfrm_mark_put(skb, &x->mark);
946 if (ret)
947 goto out;
948
949 ret = xfrm_smark_put(skb, &x->props.smark);
950 if (ret)
951 goto out;
952
953 if (x->replay_esn)
954 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
955 xfrm_replay_state_esn_len(x->replay_esn),
956 x->replay_esn);
957 else
958 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
959 &x->replay);
960 if (ret)
961 goto out;
962 if(x->xso.dev)
963 ret = copy_user_offload(&x->xso, skb);
964 if (ret)
965 goto out;
966 if (x->if_id) {
967 ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id);
968 if (ret)
969 goto out;
970 }
971 if (x->security)
972 ret = copy_sec_ctx(x->security, skb);
973out:
974 return ret;
975}
976
977static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
978{
979 struct xfrm_dump_info *sp = ptr;
980 struct sk_buff *in_skb = sp->in_skb;
981 struct sk_buff *skb = sp->out_skb;
982 struct xfrm_translator *xtr;
983 struct xfrm_usersa_info *p;
984 struct nlmsghdr *nlh;
985 int err;
986
987 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
988 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
989 if (nlh == NULL)
990 return -EMSGSIZE;
991
992 p = nlmsg_data(nlh);
993
994 err = copy_to_user_state_extra(x, p, skb);
995 if (err) {
996 nlmsg_cancel(skb, nlh);
997 return err;
998 }
999 nlmsg_end(skb, nlh);
1000
1001 xtr = xfrm_get_translator();
1002 if (xtr) {
1003 err = xtr->alloc_compat(skb, nlh);
1004
1005 xfrm_put_translator(xtr);
1006 if (err) {
1007 nlmsg_cancel(skb, nlh);
1008 return err;
1009 }
1010 }
1011
1012 return 0;
1013}
1014
1015static int xfrm_dump_sa_done(struct netlink_callback *cb)
1016{
1017 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1018 struct sock *sk = cb->skb->sk;
1019 struct net *net = sock_net(sk);
1020
1021 if (cb->args[0])
1022 xfrm_state_walk_done(walk, net);
1023 return 0;
1024}
1025
1026static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
1027{
1028 struct net *net = sock_net(skb->sk);
1029 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
1030 struct xfrm_dump_info info;
1031
1032 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
1033 sizeof(cb->args) - sizeof(cb->args[0]));
1034
1035 info.in_skb = cb->skb;
1036 info.out_skb = skb;
1037 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1038 info.nlmsg_flags = NLM_F_MULTI;
1039
1040 if (!cb->args[0]) {
1041 struct nlattr *attrs[XFRMA_MAX+1];
1042 struct xfrm_address_filter *filter = NULL;
1043 u8 proto = 0;
1044 int err;
1045
1046 err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX,
1047 xfrma_policy, cb->extack);
1048 if (err < 0)
1049 return err;
1050
1051 if (attrs[XFRMA_ADDRESS_FILTER]) {
1052 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
1053 sizeof(*filter), GFP_KERNEL);
1054 if (filter == NULL)
1055 return -ENOMEM;
1056
1057 /* see addr_match(), (prefix length >> 5) << 2
1058 * will be used to compare xfrm_address_t
1059 */
1060 if (filter->splen > (sizeof(xfrm_address_t) << 3) ||
1061 filter->dplen > (sizeof(xfrm_address_t) << 3)) {
1062 kfree(filter);
1063 return -EINVAL;
1064 }
1065 }
1066
1067 if (attrs[XFRMA_PROTO])
1068 proto = nla_get_u8(attrs[XFRMA_PROTO]);
1069
1070 xfrm_state_walk_init(walk, proto, filter);
1071 cb->args[0] = 1;
1072 }
1073
1074 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
1075
1076 return skb->len;
1077}
1078
1079static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
1080 struct xfrm_state *x, u32 seq)
1081{
1082 struct xfrm_dump_info info;
1083 struct sk_buff *skb;
1084 int err;
1085
1086 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1087 if (!skb)
1088 return ERR_PTR(-ENOMEM);
1089
1090 info.in_skb = in_skb;
1091 info.out_skb = skb;
1092 info.nlmsg_seq = seq;
1093 info.nlmsg_flags = 0;
1094
1095 err = dump_one_state(x, 0, &info);
1096 if (err) {
1097 kfree_skb(skb);
1098 return ERR_PTR(err);
1099 }
1100
1101 return skb;
1102}
1103
1104/* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1105 * Must be called with RCU read lock.
1106 */
1107static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1108 u32 pid, unsigned int group)
1109{
1110 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1111 struct xfrm_translator *xtr;
1112
1113 if (!nlsk) {
1114 kfree_skb(skb);
1115 return -EPIPE;
1116 }
1117
1118 xtr = xfrm_get_translator();
1119 if (xtr) {
1120 int err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1121
1122 xfrm_put_translator(xtr);
1123 if (err) {
1124 kfree_skb(skb);
1125 return err;
1126 }
1127 }
1128
1129 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1130}
1131
1132static inline unsigned int xfrm_spdinfo_msgsize(void)
1133{
1134 return NLMSG_ALIGN(4)
1135 + nla_total_size(sizeof(struct xfrmu_spdinfo))
1136 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1137 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1138 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1139}
1140
1141static int build_spdinfo(struct sk_buff *skb, struct net *net,
1142 u32 portid, u32 seq, u32 flags)
1143{
1144 struct xfrmk_spdinfo si;
1145 struct xfrmu_spdinfo spc;
1146 struct xfrmu_spdhinfo sph;
1147 struct xfrmu_spdhthresh spt4, spt6;
1148 struct nlmsghdr *nlh;
1149 int err;
1150 u32 *f;
1151 unsigned lseq;
1152
1153 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1154 if (nlh == NULL) /* shouldn't really happen ... */
1155 return -EMSGSIZE;
1156
1157 f = nlmsg_data(nlh);
1158 *f = flags;
1159 xfrm_spd_getinfo(net, &si);
1160 spc.incnt = si.incnt;
1161 spc.outcnt = si.outcnt;
1162 spc.fwdcnt = si.fwdcnt;
1163 spc.inscnt = si.inscnt;
1164 spc.outscnt = si.outscnt;
1165 spc.fwdscnt = si.fwdscnt;
1166 sph.spdhcnt = si.spdhcnt;
1167 sph.spdhmcnt = si.spdhmcnt;
1168
1169 do {
1170 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1171
1172 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1173 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1174 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1175 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1176 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1177
1178 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1179 if (!err)
1180 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1181 if (!err)
1182 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1183 if (!err)
1184 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1185 if (err) {
1186 nlmsg_cancel(skb, nlh);
1187 return err;
1188 }
1189
1190 nlmsg_end(skb, nlh);
1191 return 0;
1192}
1193
1194static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1195 struct nlattr **attrs)
1196{
1197 struct net *net = sock_net(skb->sk);
1198 struct xfrmu_spdhthresh *thresh4 = NULL;
1199 struct xfrmu_spdhthresh *thresh6 = NULL;
1200
1201 /* selector prefixlen thresholds to hash policies */
1202 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1203 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1204
1205 if (nla_len(rta) < sizeof(*thresh4))
1206 return -EINVAL;
1207 thresh4 = nla_data(rta);
1208 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1209 return -EINVAL;
1210 }
1211 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1212 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1213
1214 if (nla_len(rta) < sizeof(*thresh6))
1215 return -EINVAL;
1216 thresh6 = nla_data(rta);
1217 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1218 return -EINVAL;
1219 }
1220
1221 if (thresh4 || thresh6) {
1222 write_seqlock(&net->xfrm.policy_hthresh.lock);
1223 if (thresh4) {
1224 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1225 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1226 }
1227 if (thresh6) {
1228 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1229 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1230 }
1231 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1232
1233 xfrm_policy_hash_rebuild(net);
1234 }
1235
1236 return 0;
1237}
1238
1239static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1240 struct nlattr **attrs)
1241{
1242 struct net *net = sock_net(skb->sk);
1243 struct sk_buff *r_skb;
1244 u32 *flags = nlmsg_data(nlh);
1245 u32 sportid = NETLINK_CB(skb).portid;
1246 u32 seq = nlh->nlmsg_seq;
1247 int err;
1248
1249 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1250 if (r_skb == NULL)
1251 return -ENOMEM;
1252
1253 err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1254 BUG_ON(err < 0);
1255
1256 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1257}
1258
1259static inline unsigned int xfrm_sadinfo_msgsize(void)
1260{
1261 return NLMSG_ALIGN(4)
1262 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1263 + nla_total_size(4); /* XFRMA_SAD_CNT */
1264}
1265
1266static int build_sadinfo(struct sk_buff *skb, struct net *net,
1267 u32 portid, u32 seq, u32 flags)
1268{
1269 struct xfrmk_sadinfo si;
1270 struct xfrmu_sadhinfo sh;
1271 struct nlmsghdr *nlh;
1272 int err;
1273 u32 *f;
1274
1275 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1276 if (nlh == NULL) /* shouldn't really happen ... */
1277 return -EMSGSIZE;
1278
1279 f = nlmsg_data(nlh);
1280 *f = flags;
1281 xfrm_sad_getinfo(net, &si);
1282
1283 sh.sadhmcnt = si.sadhmcnt;
1284 sh.sadhcnt = si.sadhcnt;
1285
1286 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1287 if (!err)
1288 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1289 if (err) {
1290 nlmsg_cancel(skb, nlh);
1291 return err;
1292 }
1293
1294 nlmsg_end(skb, nlh);
1295 return 0;
1296}
1297
1298static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1299 struct nlattr **attrs)
1300{
1301 struct net *net = sock_net(skb->sk);
1302 struct sk_buff *r_skb;
1303 u32 *flags = nlmsg_data(nlh);
1304 u32 sportid = NETLINK_CB(skb).portid;
1305 u32 seq = nlh->nlmsg_seq;
1306 int err;
1307
1308 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1309 if (r_skb == NULL)
1310 return -ENOMEM;
1311
1312 err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1313 BUG_ON(err < 0);
1314
1315 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1316}
1317
1318static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1319 struct nlattr **attrs)
1320{
1321 struct net *net = sock_net(skb->sk);
1322 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1323 struct xfrm_state *x;
1324 struct sk_buff *resp_skb;
1325 int err = -ESRCH;
1326
1327 x = xfrm_user_state_lookup(net, p, attrs, &err);
1328 if (x == NULL)
1329 goto out_noput;
1330
1331 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1332 if (IS_ERR(resp_skb)) {
1333 err = PTR_ERR(resp_skb);
1334 } else {
1335 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1336 }
1337 xfrm_state_put(x);
1338out_noput:
1339 return err;
1340}
1341
1342static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1343 struct nlattr **attrs)
1344{
1345 struct net *net = sock_net(skb->sk);
1346 struct xfrm_state *x;
1347 struct xfrm_userspi_info *p;
1348 struct xfrm_translator *xtr;
1349 struct sk_buff *resp_skb;
1350 xfrm_address_t *daddr;
1351 int family;
1352 int err;
1353 u32 mark;
1354 struct xfrm_mark m;
1355 u32 if_id = 0;
1356
1357 p = nlmsg_data(nlh);
1358 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1359 if (err)
1360 goto out_noput;
1361
1362 family = p->info.family;
1363 daddr = &p->info.id.daddr;
1364
1365 x = NULL;
1366
1367 mark = xfrm_mark_get(attrs, &m);
1368
1369 if (attrs[XFRMA_IF_ID])
1370 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1371
1372 if (p->info.seq) {
1373 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1374 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1375 xfrm_state_put(x);
1376 x = NULL;
1377 }
1378 }
1379
1380 if (!x)
1381 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1382 if_id, p->info.id.proto, daddr,
1383 &p->info.saddr, 1,
1384 family);
1385 err = -ENOENT;
1386 if (x == NULL)
1387 goto out_noput;
1388
1389 err = xfrm_alloc_spi(x, p->min, p->max);
1390 if (err)
1391 goto out;
1392
1393 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1394 if (IS_ERR(resp_skb)) {
1395 err = PTR_ERR(resp_skb);
1396 goto out;
1397 }
1398
1399 xtr = xfrm_get_translator();
1400 if (xtr) {
1401 err = xtr->alloc_compat(skb, nlmsg_hdr(skb));
1402
1403 xfrm_put_translator(xtr);
1404 if (err) {
1405 kfree_skb(resp_skb);
1406 goto out;
1407 }
1408 }
1409
1410 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1411
1412out:
1413 xfrm_state_put(x);
1414out_noput:
1415 return err;
1416}
1417
1418static int verify_policy_dir(u8 dir)
1419{
1420 switch (dir) {
1421 case XFRM_POLICY_IN:
1422 case XFRM_POLICY_OUT:
1423 case XFRM_POLICY_FWD:
1424 break;
1425
1426 default:
1427 return -EINVAL;
1428 }
1429
1430 return 0;
1431}
1432
1433static int verify_policy_type(u8 type)
1434{
1435 switch (type) {
1436 case XFRM_POLICY_TYPE_MAIN:
1437#ifdef CONFIG_XFRM_SUB_POLICY
1438 case XFRM_POLICY_TYPE_SUB:
1439#endif
1440 break;
1441
1442 default:
1443 return -EINVAL;
1444 }
1445
1446 return 0;
1447}
1448
1449static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1450{
1451 int ret;
1452
1453 switch (p->share) {
1454 case XFRM_SHARE_ANY:
1455 case XFRM_SHARE_SESSION:
1456 case XFRM_SHARE_USER:
1457 case XFRM_SHARE_UNIQUE:
1458 break;
1459
1460 default:
1461 return -EINVAL;
1462 }
1463
1464 switch (p->action) {
1465 case XFRM_POLICY_ALLOW:
1466 case XFRM_POLICY_BLOCK:
1467 break;
1468
1469 default:
1470 return -EINVAL;
1471 }
1472
1473 switch (p->sel.family) {
1474 case AF_INET:
1475 if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
1476 return -EINVAL;
1477
1478 break;
1479
1480 case AF_INET6:
1481#if IS_ENABLED(CONFIG_IPV6)
1482 if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
1483 return -EINVAL;
1484
1485 break;
1486#else
1487 return -EAFNOSUPPORT;
1488#endif
1489
1490 default:
1491 return -EINVAL;
1492 }
1493
1494 ret = verify_policy_dir(p->dir);
1495 if (ret)
1496 return ret;
1497 if (p->index && (xfrm_policy_id2dir(p->index) != p->dir))
1498 return -EINVAL;
1499
1500 return 0;
1501}
1502
1503static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1504{
1505 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1506 struct xfrm_user_sec_ctx *uctx;
1507
1508 if (!rt)
1509 return 0;
1510
1511 uctx = nla_data(rt);
1512 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1513}
1514
1515static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1516 int nr)
1517{
1518 int i;
1519
1520 xp->xfrm_nr = nr;
1521 for (i = 0; i < nr; i++, ut++) {
1522 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1523
1524 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1525 memcpy(&t->saddr, &ut->saddr,
1526 sizeof(xfrm_address_t));
1527 t->reqid = ut->reqid;
1528 t->mode = ut->mode;
1529 t->share = ut->share;
1530 t->optional = ut->optional;
1531 t->aalgos = ut->aalgos;
1532 t->ealgos = ut->ealgos;
1533 t->calgos = ut->calgos;
1534 /* If all masks are ~0, then we allow all algorithms. */
1535 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1536 t->encap_family = ut->family;
1537 }
1538}
1539
1540static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1541{
1542 u16 prev_family;
1543 int i;
1544
1545 if (nr > XFRM_MAX_DEPTH)
1546 return -EINVAL;
1547
1548 prev_family = family;
1549
1550 for (i = 0; i < nr; i++) {
1551 /* We never validated the ut->family value, so many
1552 * applications simply leave it at zero. The check was
1553 * never made and ut->family was ignored because all
1554 * templates could be assumed to have the same family as
1555 * the policy itself. Now that we will have ipv4-in-ipv6
1556 * and ipv6-in-ipv4 tunnels, this is no longer true.
1557 */
1558 if (!ut[i].family)
1559 ut[i].family = family;
1560
1561 switch (ut[i].mode) {
1562 case XFRM_MODE_TUNNEL:
1563 case XFRM_MODE_BEET:
1564 break;
1565 default:
1566 if (ut[i].family != prev_family)
1567 return -EINVAL;
1568 break;
1569 }
1570 if (ut[i].mode >= XFRM_MODE_MAX)
1571 return -EINVAL;
1572
1573 prev_family = ut[i].family;
1574
1575 switch (ut[i].family) {
1576 case AF_INET:
1577 break;
1578#if IS_ENABLED(CONFIG_IPV6)
1579 case AF_INET6:
1580 break;
1581#endif
1582 default:
1583 return -EINVAL;
1584 }
1585
1586 if (!xfrm_id_proto_valid(ut[i].id.proto))
1587 return -EINVAL;
1588 }
1589
1590 return 0;
1591}
1592
1593static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1594{
1595 struct nlattr *rt = attrs[XFRMA_TMPL];
1596
1597 if (!rt) {
1598 pol->xfrm_nr = 0;
1599 } else {
1600 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1601 int nr = nla_len(rt) / sizeof(*utmpl);
1602 int err;
1603
1604 err = validate_tmpl(nr, utmpl, pol->family);
1605 if (err)
1606 return err;
1607
1608 copy_templates(pol, utmpl, nr);
1609 }
1610 return 0;
1611}
1612
1613static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1614{
1615 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1616 struct xfrm_userpolicy_type *upt;
1617 u8 type = XFRM_POLICY_TYPE_MAIN;
1618 int err;
1619
1620 if (rt) {
1621 upt = nla_data(rt);
1622 type = upt->type;
1623 }
1624
1625 err = verify_policy_type(type);
1626 if (err)
1627 return err;
1628
1629 *tp = type;
1630 return 0;
1631}
1632
1633static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1634{
1635 xp->priority = p->priority;
1636 xp->index = p->index;
1637 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1638 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1639 xp->action = p->action;
1640 xp->flags = p->flags;
1641 xp->family = p->sel.family;
1642 /* XXX xp->share = p->share; */
1643}
1644
1645static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1646{
1647 memset(p, 0, sizeof(*p));
1648 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1649 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1650 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1651 p->priority = xp->priority;
1652 p->index = xp->index;
1653 p->sel.family = xp->family;
1654 p->dir = dir;
1655 p->action = xp->action;
1656 p->flags = xp->flags;
1657 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1658}
1659
1660static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1661{
1662 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1663 int err;
1664
1665 if (!xp) {
1666 *errp = -ENOMEM;
1667 return NULL;
1668 }
1669
1670 copy_from_user_policy(xp, p);
1671
1672 err = copy_from_user_policy_type(&xp->type, attrs);
1673 if (err)
1674 goto error;
1675
1676 if (!(err = copy_from_user_tmpl(xp, attrs)))
1677 err = copy_from_user_sec_ctx(xp, attrs);
1678 if (err)
1679 goto error;
1680
1681 xfrm_mark_get(attrs, &xp->mark);
1682
1683 if (attrs[XFRMA_IF_ID])
1684 xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1685
1686 return xp;
1687 error:
1688 *errp = err;
1689 xp->walk.dead = 1;
1690 xfrm_policy_destroy(xp);
1691 return NULL;
1692}
1693
1694static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1695 struct nlattr **attrs)
1696{
1697 struct net *net = sock_net(skb->sk);
1698 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1699 struct xfrm_policy *xp;
1700 struct km_event c;
1701 int err;
1702 int excl;
1703
1704 err = verify_newpolicy_info(p);
1705 if (err)
1706 return err;
1707 err = verify_sec_ctx_len(attrs);
1708 if (err)
1709 return err;
1710
1711 xp = xfrm_policy_construct(net, p, attrs, &err);
1712 if (!xp)
1713 return err;
1714
1715 /* shouldn't excl be based on nlh flags??
1716 * Aha! this is anti-netlink really i.e more pfkey derived
1717 * in netlink excl is a flag and you wouldnt need
1718 * a type XFRM_MSG_UPDPOLICY - JHS */
1719 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1720 err = xfrm_policy_insert(p->dir, xp, excl);
1721 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1722
1723 if (err) {
1724 security_xfrm_policy_free(xp->security);
1725 kfree(xp);
1726 return err;
1727 }
1728
1729 c.event = nlh->nlmsg_type;
1730 c.seq = nlh->nlmsg_seq;
1731 c.portid = nlh->nlmsg_pid;
1732 km_policy_notify(xp, p->dir, &c);
1733
1734 xfrm_pol_put(xp);
1735
1736 return 0;
1737}
1738
1739static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1740{
1741 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1742 int i;
1743
1744 if (xp->xfrm_nr == 0)
1745 return 0;
1746
1747 if (xp->xfrm_nr > XFRM_MAX_DEPTH)
1748 return -ENOBUFS;
1749
1750 for (i = 0; i < xp->xfrm_nr; i++) {
1751 struct xfrm_user_tmpl *up = &vec[i];
1752 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1753
1754 memset(up, 0, sizeof(*up));
1755 memcpy(&up->id, &kp->id, sizeof(up->id));
1756 up->family = kp->encap_family;
1757 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1758 up->reqid = kp->reqid;
1759 up->mode = kp->mode;
1760 up->share = kp->share;
1761 up->optional = kp->optional;
1762 up->aalgos = kp->aalgos;
1763 up->ealgos = kp->ealgos;
1764 up->calgos = kp->calgos;
1765 }
1766
1767 return nla_put(skb, XFRMA_TMPL,
1768 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1769}
1770
1771static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1772{
1773 if (x->security) {
1774 return copy_sec_ctx(x->security, skb);
1775 }
1776 return 0;
1777}
1778
1779static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1780{
1781 if (xp->security)
1782 return copy_sec_ctx(xp->security, skb);
1783 return 0;
1784}
1785static inline unsigned int userpolicy_type_attrsize(void)
1786{
1787#ifdef CONFIG_XFRM_SUB_POLICY
1788 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1789#else
1790 return 0;
1791#endif
1792}
1793
1794#ifdef CONFIG_XFRM_SUB_POLICY
1795static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1796{
1797 struct xfrm_userpolicy_type upt;
1798
1799 /* Sadly there are two holes in struct xfrm_userpolicy_type */
1800 memset(&upt, 0, sizeof(upt));
1801 upt.type = type;
1802
1803 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1804}
1805
1806#else
1807static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1808{
1809 return 0;
1810}
1811#endif
1812
1813static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1814{
1815 struct xfrm_dump_info *sp = ptr;
1816 struct xfrm_userpolicy_info *p;
1817 struct sk_buff *in_skb = sp->in_skb;
1818 struct sk_buff *skb = sp->out_skb;
1819 struct xfrm_translator *xtr;
1820 struct nlmsghdr *nlh;
1821 int err;
1822
1823 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1824 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1825 if (nlh == NULL)
1826 return -EMSGSIZE;
1827
1828 p = nlmsg_data(nlh);
1829 copy_to_user_policy(xp, p, dir);
1830 err = copy_to_user_tmpl(xp, skb);
1831 if (!err)
1832 err = copy_to_user_sec_ctx(xp, skb);
1833 if (!err)
1834 err = copy_to_user_policy_type(xp->type, skb);
1835 if (!err)
1836 err = xfrm_mark_put(skb, &xp->mark);
1837 if (!err)
1838 err = xfrm_if_id_put(skb, xp->if_id);
1839 if (err) {
1840 nlmsg_cancel(skb, nlh);
1841 return err;
1842 }
1843 nlmsg_end(skb, nlh);
1844
1845 xtr = xfrm_get_translator();
1846 if (xtr) {
1847 err = xtr->alloc_compat(skb, nlh);
1848
1849 xfrm_put_translator(xtr);
1850 if (err) {
1851 nlmsg_cancel(skb, nlh);
1852 return err;
1853 }
1854 }
1855
1856 return 0;
1857}
1858
1859static int xfrm_dump_policy_done(struct netlink_callback *cb)
1860{
1861 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1862 struct net *net = sock_net(cb->skb->sk);
1863
1864 xfrm_policy_walk_done(walk, net);
1865 return 0;
1866}
1867
1868static int xfrm_dump_policy_start(struct netlink_callback *cb)
1869{
1870 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1871
1872 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1873
1874 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1875 return 0;
1876}
1877
1878static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1879{
1880 struct net *net = sock_net(skb->sk);
1881 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1882 struct xfrm_dump_info info;
1883
1884 info.in_skb = cb->skb;
1885 info.out_skb = skb;
1886 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1887 info.nlmsg_flags = NLM_F_MULTI;
1888
1889 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1890
1891 return skb->len;
1892}
1893
1894static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1895 struct xfrm_policy *xp,
1896 int dir, u32 seq)
1897{
1898 struct xfrm_dump_info info;
1899 struct sk_buff *skb;
1900 int err;
1901
1902 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1903 if (!skb)
1904 return ERR_PTR(-ENOMEM);
1905
1906 info.in_skb = in_skb;
1907 info.out_skb = skb;
1908 info.nlmsg_seq = seq;
1909 info.nlmsg_flags = 0;
1910
1911 err = dump_one_policy(xp, dir, 0, &info);
1912 if (err) {
1913 kfree_skb(skb);
1914 return ERR_PTR(err);
1915 }
1916
1917 return skb;
1918}
1919
1920static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1921 struct nlattr **attrs)
1922{
1923 struct net *net = sock_net(skb->sk);
1924 struct xfrm_policy *xp;
1925 struct xfrm_userpolicy_id *p;
1926 u8 type = XFRM_POLICY_TYPE_MAIN;
1927 int err;
1928 struct km_event c;
1929 int delete;
1930 struct xfrm_mark m;
1931 u32 if_id = 0;
1932
1933 p = nlmsg_data(nlh);
1934 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1935
1936 err = copy_from_user_policy_type(&type, attrs);
1937 if (err)
1938 return err;
1939
1940 err = verify_policy_dir(p->dir);
1941 if (err)
1942 return err;
1943
1944 if (attrs[XFRMA_IF_ID])
1945 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
1946
1947 xfrm_mark_get(attrs, &m);
1948
1949 if (p->index)
1950 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir,
1951 p->index, delete, &err);
1952 else {
1953 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1954 struct xfrm_sec_ctx *ctx;
1955
1956 err = verify_sec_ctx_len(attrs);
1957 if (err)
1958 return err;
1959
1960 ctx = NULL;
1961 if (rt) {
1962 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1963
1964 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1965 if (err)
1966 return err;
1967 }
1968 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
1969 &p->sel, ctx, delete, &err);
1970 security_xfrm_policy_free(ctx);
1971 }
1972 if (xp == NULL)
1973 return -ENOENT;
1974
1975 if (!delete) {
1976 struct sk_buff *resp_skb;
1977
1978 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1979 if (IS_ERR(resp_skb)) {
1980 err = PTR_ERR(resp_skb);
1981 } else {
1982 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1983 NETLINK_CB(skb).portid);
1984 }
1985 } else {
1986 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1987
1988 if (err != 0)
1989 goto out;
1990
1991 c.data.byid = p->index;
1992 c.event = nlh->nlmsg_type;
1993 c.seq = nlh->nlmsg_seq;
1994 c.portid = nlh->nlmsg_pid;
1995 km_policy_notify(xp, p->dir, &c);
1996 }
1997
1998out:
1999 xfrm_pol_put(xp);
2000 return err;
2001}
2002
2003static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
2004 struct nlattr **attrs)
2005{
2006 struct net *net = sock_net(skb->sk);
2007 struct km_event c;
2008 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
2009 int err;
2010
2011 err = xfrm_state_flush(net, p->proto, true, false);
2012 if (err) {
2013 if (err == -ESRCH) /* empty table */
2014 return 0;
2015 return err;
2016 }
2017 c.data.proto = p->proto;
2018 c.event = nlh->nlmsg_type;
2019 c.seq = nlh->nlmsg_seq;
2020 c.portid = nlh->nlmsg_pid;
2021 c.net = net;
2022 km_state_notify(NULL, &c);
2023
2024 return 0;
2025}
2026
2027static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
2028{
2029 unsigned int replay_size = x->replay_esn ?
2030 xfrm_replay_state_esn_len(x->replay_esn) :
2031 sizeof(struct xfrm_replay_state);
2032
2033 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
2034 + nla_total_size(replay_size)
2035 + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
2036 + nla_total_size(sizeof(struct xfrm_mark))
2037 + nla_total_size(4) /* XFRM_AE_RTHR */
2038 + nla_total_size(4); /* XFRM_AE_ETHR */
2039}
2040
2041static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2042{
2043 struct xfrm_aevent_id *id;
2044 struct nlmsghdr *nlh;
2045 int err;
2046
2047 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
2048 if (nlh == NULL)
2049 return -EMSGSIZE;
2050
2051 id = nlmsg_data(nlh);
2052 memset(&id->sa_id, 0, sizeof(id->sa_id));
2053 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
2054 id->sa_id.spi = x->id.spi;
2055 id->sa_id.family = x->props.family;
2056 id->sa_id.proto = x->id.proto;
2057 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
2058 id->reqid = x->props.reqid;
2059 id->flags = c->data.aevent;
2060
2061 if (x->replay_esn) {
2062 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
2063 xfrm_replay_state_esn_len(x->replay_esn),
2064 x->replay_esn);
2065 } else {
2066 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
2067 &x->replay);
2068 }
2069 if (err)
2070 goto out_cancel;
2071 err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
2072 XFRMA_PAD);
2073 if (err)
2074 goto out_cancel;
2075
2076 if (id->flags & XFRM_AE_RTHR) {
2077 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
2078 if (err)
2079 goto out_cancel;
2080 }
2081 if (id->flags & XFRM_AE_ETHR) {
2082 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
2083 x->replay_maxage * 10 / HZ);
2084 if (err)
2085 goto out_cancel;
2086 }
2087 err = xfrm_mark_put(skb, &x->mark);
2088 if (err)
2089 goto out_cancel;
2090
2091 err = xfrm_if_id_put(skb, x->if_id);
2092 if (err)
2093 goto out_cancel;
2094
2095 nlmsg_end(skb, nlh);
2096 return 0;
2097
2098out_cancel:
2099 nlmsg_cancel(skb, nlh);
2100 return err;
2101}
2102
2103static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2104 struct nlattr **attrs)
2105{
2106 struct net *net = sock_net(skb->sk);
2107 struct xfrm_state *x;
2108 struct sk_buff *r_skb;
2109 int err;
2110 struct km_event c;
2111 u32 mark;
2112 struct xfrm_mark m;
2113 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2114 struct xfrm_usersa_id *id = &p->sa_id;
2115
2116 mark = xfrm_mark_get(attrs, &m);
2117
2118 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
2119 if (x == NULL)
2120 return -ESRCH;
2121
2122 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2123 if (r_skb == NULL) {
2124 xfrm_state_put(x);
2125 return -ENOMEM;
2126 }
2127
2128 /*
2129 * XXX: is this lock really needed - none of the other
2130 * gets lock (the concern is things getting updated
2131 * while we are still reading) - jhs
2132 */
2133 spin_lock_bh(&x->lock);
2134 c.data.aevent = p->flags;
2135 c.seq = nlh->nlmsg_seq;
2136 c.portid = nlh->nlmsg_pid;
2137
2138 err = build_aevent(r_skb, x, &c);
2139 BUG_ON(err < 0);
2140
2141 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
2142 spin_unlock_bh(&x->lock);
2143 xfrm_state_put(x);
2144 return err;
2145}
2146
2147static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
2148 struct nlattr **attrs)
2149{
2150 struct net *net = sock_net(skb->sk);
2151 struct xfrm_state *x;
2152 struct km_event c;
2153 int err = -EINVAL;
2154 u32 mark = 0;
2155 struct xfrm_mark m;
2156 struct xfrm_aevent_id *p = nlmsg_data(nlh);
2157 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2158 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2159 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2160 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2161 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2162
2163 if (!lt && !rp && !re && !et && !rt)
2164 return err;
2165
2166 /* pedantic mode - thou shalt sayeth replaceth */
2167 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2168 return err;
2169
2170 mark = xfrm_mark_get(attrs, &m);
2171
2172 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2173 if (x == NULL)
2174 return -ESRCH;
2175
2176 if (x->km.state != XFRM_STATE_VALID)
2177 goto out;
2178
2179 err = xfrm_replay_verify_len(x->replay_esn, re);
2180 if (err)
2181 goto out;
2182
2183 spin_lock_bh(&x->lock);
2184 xfrm_update_ae_params(x, attrs, 1);
2185 spin_unlock_bh(&x->lock);
2186
2187 c.event = nlh->nlmsg_type;
2188 c.seq = nlh->nlmsg_seq;
2189 c.portid = nlh->nlmsg_pid;
2190 c.data.aevent = XFRM_AE_CU;
2191 km_state_notify(x, &c);
2192 err = 0;
2193out:
2194 xfrm_state_put(x);
2195 return err;
2196}
2197
2198static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2199 struct nlattr **attrs)
2200{
2201 struct net *net = sock_net(skb->sk);
2202 struct km_event c;
2203 u8 type = XFRM_POLICY_TYPE_MAIN;
2204 int err;
2205
2206 err = copy_from_user_policy_type(&type, attrs);
2207 if (err)
2208 return err;
2209
2210 err = xfrm_policy_flush(net, type, true);
2211 if (err) {
2212 if (err == -ESRCH) /* empty table */
2213 return 0;
2214 return err;
2215 }
2216
2217 c.data.type = type;
2218 c.event = nlh->nlmsg_type;
2219 c.seq = nlh->nlmsg_seq;
2220 c.portid = nlh->nlmsg_pid;
2221 c.net = net;
2222 km_policy_notify(NULL, 0, &c);
2223 return 0;
2224}
2225
2226static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2227 struct nlattr **attrs)
2228{
2229 struct net *net = sock_net(skb->sk);
2230 struct xfrm_policy *xp;
2231 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2232 struct xfrm_userpolicy_info *p = &up->pol;
2233 u8 type = XFRM_POLICY_TYPE_MAIN;
2234 int err = -ENOENT;
2235 struct xfrm_mark m;
2236 u32 if_id = 0;
2237
2238 err = copy_from_user_policy_type(&type, attrs);
2239 if (err)
2240 return err;
2241
2242 err = verify_policy_dir(p->dir);
2243 if (err)
2244 return err;
2245
2246 if (attrs[XFRMA_IF_ID])
2247 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2248
2249 xfrm_mark_get(attrs, &m);
2250
2251 if (p->index)
2252 xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index,
2253 0, &err);
2254 else {
2255 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2256 struct xfrm_sec_ctx *ctx;
2257
2258 err = verify_sec_ctx_len(attrs);
2259 if (err)
2260 return err;
2261
2262 ctx = NULL;
2263 if (rt) {
2264 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2265
2266 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2267 if (err)
2268 return err;
2269 }
2270 xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir,
2271 &p->sel, ctx, 0, &err);
2272 security_xfrm_policy_free(ctx);
2273 }
2274 if (xp == NULL)
2275 return -ENOENT;
2276
2277 if (unlikely(xp->walk.dead))
2278 goto out;
2279
2280 err = 0;
2281 if (up->hard) {
2282 xfrm_policy_delete(xp, p->dir);
2283 xfrm_audit_policy_delete(xp, 1, true);
2284 }
2285 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2286
2287out:
2288 xfrm_pol_put(xp);
2289 return err;
2290}
2291
2292static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2293 struct nlattr **attrs)
2294{
2295 struct net *net = sock_net(skb->sk);
2296 struct xfrm_state *x;
2297 int err;
2298 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2299 struct xfrm_usersa_info *p = &ue->state;
2300 struct xfrm_mark m;
2301 u32 mark = xfrm_mark_get(attrs, &m);
2302
2303 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2304
2305 err = -ENOENT;
2306 if (x == NULL)
2307 return err;
2308
2309 spin_lock_bh(&x->lock);
2310 err = -EINVAL;
2311 if (x->km.state != XFRM_STATE_VALID)
2312 goto out;
2313 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2314
2315 if (ue->hard) {
2316 __xfrm_state_delete(x);
2317 xfrm_audit_state_delete(x, 1, true);
2318 }
2319 err = 0;
2320out:
2321 spin_unlock_bh(&x->lock);
2322 xfrm_state_put(x);
2323 return err;
2324}
2325
2326static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2327 struct nlattr **attrs)
2328{
2329 struct net *net = sock_net(skb->sk);
2330 struct xfrm_policy *xp;
2331 struct xfrm_user_tmpl *ut;
2332 int i;
2333 struct nlattr *rt = attrs[XFRMA_TMPL];
2334 struct xfrm_mark mark;
2335
2336 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2337 struct xfrm_state *x = xfrm_state_alloc(net);
2338 int err = -ENOMEM;
2339
2340 if (!x)
2341 goto nomem;
2342
2343 xfrm_mark_get(attrs, &mark);
2344
2345 err = verify_newpolicy_info(&ua->policy);
2346 if (err)
2347 goto free_state;
2348 err = verify_sec_ctx_len(attrs);
2349 if (err)
2350 goto free_state;
2351
2352 /* build an XP */
2353 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2354 if (!xp)
2355 goto free_state;
2356
2357 memcpy(&x->id, &ua->id, sizeof(ua->id));
2358 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2359 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2360 xp->mark.m = x->mark.m = mark.m;
2361 xp->mark.v = x->mark.v = mark.v;
2362 ut = nla_data(rt);
2363 /* extract the templates and for each call km_key */
2364 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2365 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2366 memcpy(&x->id, &t->id, sizeof(x->id));
2367 x->props.mode = t->mode;
2368 x->props.reqid = t->reqid;
2369 x->props.family = ut->family;
2370 t->aalgos = ua->aalgos;
2371 t->ealgos = ua->ealgos;
2372 t->calgos = ua->calgos;
2373 err = km_query(x, t, xp);
2374
2375 }
2376
2377 xfrm_state_free(x);
2378 kfree(xp);
2379
2380 return 0;
2381
2382free_state:
2383 xfrm_state_free(x);
2384nomem:
2385 return err;
2386}
2387
2388#ifdef CONFIG_XFRM_MIGRATE
2389static int copy_from_user_migrate(struct xfrm_migrate *ma,
2390 struct xfrm_kmaddress *k,
2391 struct nlattr **attrs, int *num)
2392{
2393 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2394 struct xfrm_user_migrate *um;
2395 int i, num_migrate;
2396
2397 if (k != NULL) {
2398 struct xfrm_user_kmaddress *uk;
2399
2400 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2401 memcpy(&k->local, &uk->local, sizeof(k->local));
2402 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2403 k->family = uk->family;
2404 k->reserved = uk->reserved;
2405 }
2406
2407 um = nla_data(rt);
2408 num_migrate = nla_len(rt) / sizeof(*um);
2409
2410 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2411 return -EINVAL;
2412
2413 for (i = 0; i < num_migrate; i++, um++, ma++) {
2414 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2415 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2416 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2417 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2418
2419 ma->proto = um->proto;
2420 ma->mode = um->mode;
2421 ma->reqid = um->reqid;
2422
2423 ma->old_family = um->old_family;
2424 ma->new_family = um->new_family;
2425 }
2426
2427 *num = i;
2428 return 0;
2429}
2430
2431static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2432 struct nlattr **attrs)
2433{
2434 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2435 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2436 struct xfrm_kmaddress km, *kmp;
2437 u8 type;
2438 int err;
2439 int n = 0;
2440 struct net *net = sock_net(skb->sk);
2441 struct xfrm_encap_tmpl *encap = NULL;
2442 u32 if_id = 0;
2443
2444 if (attrs[XFRMA_MIGRATE] == NULL)
2445 return -EINVAL;
2446
2447 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2448
2449 err = copy_from_user_policy_type(&type, attrs);
2450 if (err)
2451 return err;
2452
2453 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2454 if (err)
2455 return err;
2456
2457 if (!n)
2458 return 0;
2459
2460 if (attrs[XFRMA_ENCAP]) {
2461 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2462 sizeof(*encap), GFP_KERNEL);
2463 if (!encap)
2464 return 0;
2465 }
2466
2467 if (attrs[XFRMA_IF_ID])
2468 if_id = nla_get_u32(attrs[XFRMA_IF_ID]);
2469
2470 err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, if_id);
2471
2472 kfree(encap);
2473
2474 return err;
2475}
2476#else
2477static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2478 struct nlattr **attrs)
2479{
2480 return -ENOPROTOOPT;
2481}
2482#endif
2483
2484#ifdef CONFIG_XFRM_MIGRATE
2485static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2486{
2487 struct xfrm_user_migrate um;
2488
2489 memset(&um, 0, sizeof(um));
2490 um.proto = m->proto;
2491 um.mode = m->mode;
2492 um.reqid = m->reqid;
2493 um.old_family = m->old_family;
2494 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2495 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2496 um.new_family = m->new_family;
2497 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2498 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2499
2500 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2501}
2502
2503static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2504{
2505 struct xfrm_user_kmaddress uk;
2506
2507 memset(&uk, 0, sizeof(uk));
2508 uk.family = k->family;
2509 uk.reserved = k->reserved;
2510 memcpy(&uk.local, &k->local, sizeof(uk.local));
2511 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2512
2513 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2514}
2515
2516static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2517 int with_encp)
2518{
2519 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2520 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2521 + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2522 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2523 + userpolicy_type_attrsize();
2524}
2525
2526static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2527 int num_migrate, const struct xfrm_kmaddress *k,
2528 const struct xfrm_selector *sel,
2529 const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2530{
2531 const struct xfrm_migrate *mp;
2532 struct xfrm_userpolicy_id *pol_id;
2533 struct nlmsghdr *nlh;
2534 int i, err;
2535
2536 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2537 if (nlh == NULL)
2538 return -EMSGSIZE;
2539
2540 pol_id = nlmsg_data(nlh);
2541 /* copy data from selector, dir, and type to the pol_id */
2542 memset(pol_id, 0, sizeof(*pol_id));
2543 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2544 pol_id->dir = dir;
2545
2546 if (k != NULL) {
2547 err = copy_to_user_kmaddress(k, skb);
2548 if (err)
2549 goto out_cancel;
2550 }
2551 if (encap) {
2552 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2553 if (err)
2554 goto out_cancel;
2555 }
2556 err = copy_to_user_policy_type(type, skb);
2557 if (err)
2558 goto out_cancel;
2559 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2560 err = copy_to_user_migrate(mp, skb);
2561 if (err)
2562 goto out_cancel;
2563 }
2564
2565 nlmsg_end(skb, nlh);
2566 return 0;
2567
2568out_cancel:
2569 nlmsg_cancel(skb, nlh);
2570 return err;
2571}
2572
2573static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2574 const struct xfrm_migrate *m, int num_migrate,
2575 const struct xfrm_kmaddress *k,
2576 const struct xfrm_encap_tmpl *encap)
2577{
2578 struct net *net = &init_net;
2579 struct sk_buff *skb;
2580 int err;
2581
2582 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2583 GFP_ATOMIC);
2584 if (skb == NULL)
2585 return -ENOMEM;
2586
2587 /* build migrate */
2588 err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2589 BUG_ON(err < 0);
2590
2591 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2592}
2593#else
2594static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2595 const struct xfrm_migrate *m, int num_migrate,
2596 const struct xfrm_kmaddress *k,
2597 const struct xfrm_encap_tmpl *encap)
2598{
2599 return -ENOPROTOOPT;
2600}
2601#endif
2602
2603#define XMSGSIZE(type) sizeof(struct type)
2604
2605const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2606 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2607 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2608 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2609 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2610 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2611 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2612 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2613 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2614 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2615 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2616 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2617 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2618 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2619 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2620 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2621 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2622 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2623 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2624 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2625 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2626 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2627};
2628EXPORT_SYMBOL_GPL(xfrm_msg_min);
2629
2630#undef XMSGSIZE
2631
2632const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2633 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2634 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2635 [XFRMA_LASTUSED] = { .type = NLA_U64},
2636 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2637 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2638 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2639 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2640 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2641 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2642 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2643 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) },
2644 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2645 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2646 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2647 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2648 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2649 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2650 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2651 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2652 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2653 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2654 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2655 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2656 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2657 [XFRMA_PROTO] = { .type = NLA_U8 },
2658 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2659 [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) },
2660 [XFRMA_SET_MARK] = { .type = NLA_U32 },
2661 [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
2662 [XFRMA_IF_ID] = { .type = NLA_U32 },
2663};
2664EXPORT_SYMBOL_GPL(xfrma_policy);
2665
2666static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2667 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2668 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2669};
2670
2671static const struct xfrm_link {
2672 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2673 int (*start)(struct netlink_callback *);
2674 int (*dump)(struct sk_buff *, struct netlink_callback *);
2675 int (*done)(struct netlink_callback *);
2676 const struct nla_policy *nla_pol;
2677 int nla_max;
2678} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2679 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2680 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2681 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2682 .dump = xfrm_dump_sa,
2683 .done = xfrm_dump_sa_done },
2684 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2685 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2686 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2687 .start = xfrm_dump_policy_start,
2688 .dump = xfrm_dump_policy,
2689 .done = xfrm_dump_policy_done },
2690 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2691 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2692 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2693 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2694 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2695 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2696 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2697 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2698 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2699 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2700 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2701 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2702 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2703 .nla_pol = xfrma_spd_policy,
2704 .nla_max = XFRMA_SPD_MAX },
2705 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2706};
2707
2708static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2709 struct netlink_ext_ack *extack)
2710{
2711 struct net *net = sock_net(skb->sk);
2712 struct nlattr *attrs[XFRMA_MAX+1];
2713 const struct xfrm_link *link;
2714 struct nlmsghdr *nlh64 = NULL;
2715 int type, err;
2716
2717 type = nlh->nlmsg_type;
2718 if (type > XFRM_MSG_MAX)
2719 return -EINVAL;
2720
2721 type -= XFRM_MSG_BASE;
2722 link = &xfrm_dispatch[type];
2723
2724 /* All operations require privileges, even GET */
2725 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2726 return -EPERM;
2727
2728 /* Use the 64-bit / untranslated format on Android, even for compat */
2729 if (!IS_ENABLED(CONFIG_ANDROID) || IS_ENABLED(CONFIG_XFRM_USER_COMPAT)) {
2730 if (in_compat_syscall()) {
2731 struct xfrm_translator *xtr = xfrm_get_translator();
2732
2733 if (!xtr)
2734 return -EOPNOTSUPP;
2735
2736 nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max,
2737 link->nla_pol, extack);
2738 xfrm_put_translator(xtr);
2739 if (IS_ERR(nlh64))
2740 return PTR_ERR(nlh64);
2741 if (nlh64)
2742 nlh = nlh64;
2743 }
2744 }
2745
2746 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2747 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2748 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2749 struct netlink_dump_control c = {
2750 .start = link->start,
2751 .dump = link->dump,
2752 .done = link->done,
2753 };
2754
2755 if (link->dump == NULL) {
2756 err = -EINVAL;
2757 goto err;
2758 }
2759
2760 err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2761 goto err;
2762 }
2763
2764 err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs,
2765 link->nla_max ? : XFRMA_MAX,
2766 link->nla_pol ? : xfrma_policy, extack);
2767 if (err < 0)
2768 goto err;
2769
2770 if (link->doit == NULL) {
2771 err = -EINVAL;
2772 goto err;
2773 }
2774
2775 err = link->doit(skb, nlh, attrs);
2776
2777 /* We need to free skb allocated in xfrm_alloc_compat() before
2778 * returning from this function, because consume_skb() won't take
2779 * care of frag_list since netlink destructor sets
2780 * sbk->head to NULL. (see netlink_skb_destructor())
2781 */
2782 if (skb_has_frag_list(skb)) {
2783 kfree_skb(skb_shinfo(skb)->frag_list);
2784 skb_shinfo(skb)->frag_list = NULL;
2785 }
2786
2787err:
2788 kvfree(nlh64);
2789 return err;
2790}
2791
2792static void xfrm_netlink_rcv(struct sk_buff *skb)
2793{
2794 struct net *net = sock_net(skb->sk);
2795
2796 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2797 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2798 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2799}
2800
2801static inline unsigned int xfrm_expire_msgsize(void)
2802{
2803 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2804 + nla_total_size(sizeof(struct xfrm_mark));
2805}
2806
2807static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2808{
2809 struct xfrm_user_expire *ue;
2810 struct nlmsghdr *nlh;
2811 int err;
2812
2813 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2814 if (nlh == NULL)
2815 return -EMSGSIZE;
2816
2817 ue = nlmsg_data(nlh);
2818 copy_to_user_state(x, &ue->state);
2819 ue->hard = (c->data.hard != 0) ? 1 : 0;
2820 /* clear the padding bytes */
2821 memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2822
2823 err = xfrm_mark_put(skb, &x->mark);
2824 if (err)
2825 return err;
2826
2827 err = xfrm_if_id_put(skb, x->if_id);
2828 if (err)
2829 return err;
2830
2831 nlmsg_end(skb, nlh);
2832 return 0;
2833}
2834
2835static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2836{
2837 struct net *net = xs_net(x);
2838 struct sk_buff *skb;
2839
2840 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2841 if (skb == NULL)
2842 return -ENOMEM;
2843
2844 if (build_expire(skb, x, c) < 0) {
2845 kfree_skb(skb);
2846 return -EMSGSIZE;
2847 }
2848
2849 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2850}
2851
2852static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2853{
2854 struct net *net = xs_net(x);
2855 struct sk_buff *skb;
2856 int err;
2857
2858 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2859 if (skb == NULL)
2860 return -ENOMEM;
2861
2862 err = build_aevent(skb, x, c);
2863 BUG_ON(err < 0);
2864
2865 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2866}
2867
2868static int xfrm_notify_sa_flush(const struct km_event *c)
2869{
2870 struct net *net = c->net;
2871 struct xfrm_usersa_flush *p;
2872 struct nlmsghdr *nlh;
2873 struct sk_buff *skb;
2874 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2875
2876 skb = nlmsg_new(len, GFP_ATOMIC);
2877 if (skb == NULL)
2878 return -ENOMEM;
2879
2880 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2881 if (nlh == NULL) {
2882 kfree_skb(skb);
2883 return -EMSGSIZE;
2884 }
2885
2886 p = nlmsg_data(nlh);
2887 p->proto = c->data.proto;
2888
2889 nlmsg_end(skb, nlh);
2890
2891 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2892}
2893
2894static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2895{
2896 unsigned int l = 0;
2897 if (x->aead)
2898 l += nla_total_size(aead_len(x->aead));
2899 if (x->aalg) {
2900 l += nla_total_size(sizeof(struct xfrm_algo) +
2901 (x->aalg->alg_key_len + 7) / 8);
2902 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2903 }
2904 if (x->ealg)
2905 l += nla_total_size(xfrm_alg_len(x->ealg));
2906 if (x->calg)
2907 l += nla_total_size(sizeof(*x->calg));
2908 if (x->encap)
2909 l += nla_total_size(sizeof(*x->encap));
2910 if (x->tfcpad)
2911 l += nla_total_size(sizeof(x->tfcpad));
2912 if (x->replay_esn)
2913 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2914 else
2915 l += nla_total_size(sizeof(struct xfrm_replay_state));
2916 if (x->security)
2917 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2918 x->security->ctx_len);
2919 if (x->coaddr)
2920 l += nla_total_size(sizeof(*x->coaddr));
2921 if (x->props.extra_flags)
2922 l += nla_total_size(sizeof(x->props.extra_flags));
2923 if (x->xso.dev)
2924 l += nla_total_size(sizeof(struct xfrm_user_offload));
2925 if (x->props.smark.v | x->props.smark.m) {
2926 l += nla_total_size(sizeof(x->props.smark.v));
2927 l += nla_total_size(sizeof(x->props.smark.m));
2928 }
2929 if (x->if_id)
2930 l += nla_total_size(sizeof(x->if_id));
2931
2932 /* Must count x->lastused as it may become non-zero behind our back. */
2933 l += nla_total_size_64bit(sizeof(u64));
2934
2935 return l;
2936}
2937
2938static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2939{
2940 struct net *net = xs_net(x);
2941 struct xfrm_usersa_info *p;
2942 struct xfrm_usersa_id *id;
2943 struct nlmsghdr *nlh;
2944 struct sk_buff *skb;
2945 unsigned int len = xfrm_sa_len(x);
2946 unsigned int headlen;
2947 int err;
2948
2949 headlen = sizeof(*p);
2950 if (c->event == XFRM_MSG_DELSA) {
2951 len += nla_total_size(headlen);
2952 headlen = sizeof(*id);
2953 len += nla_total_size(sizeof(struct xfrm_mark));
2954 }
2955 len += NLMSG_ALIGN(headlen);
2956
2957 skb = nlmsg_new(len, GFP_ATOMIC);
2958 if (skb == NULL)
2959 return -ENOMEM;
2960
2961 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2962 err = -EMSGSIZE;
2963 if (nlh == NULL)
2964 goto out_free_skb;
2965
2966 p = nlmsg_data(nlh);
2967 if (c->event == XFRM_MSG_DELSA) {
2968 struct nlattr *attr;
2969
2970 id = nlmsg_data(nlh);
2971 memset(id, 0, sizeof(*id));
2972 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2973 id->spi = x->id.spi;
2974 id->family = x->props.family;
2975 id->proto = x->id.proto;
2976
2977 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2978 err = -EMSGSIZE;
2979 if (attr == NULL)
2980 goto out_free_skb;
2981
2982 p = nla_data(attr);
2983 }
2984 err = copy_to_user_state_extra(x, p, skb);
2985 if (err)
2986 goto out_free_skb;
2987
2988 nlmsg_end(skb, nlh);
2989
2990 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2991
2992out_free_skb:
2993 kfree_skb(skb);
2994 return err;
2995}
2996
2997static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2998{
2999
3000 switch (c->event) {
3001 case XFRM_MSG_EXPIRE:
3002 return xfrm_exp_state_notify(x, c);
3003 case XFRM_MSG_NEWAE:
3004 return xfrm_aevent_state_notify(x, c);
3005 case XFRM_MSG_DELSA:
3006 case XFRM_MSG_UPDSA:
3007 case XFRM_MSG_NEWSA:
3008 return xfrm_notify_sa(x, c);
3009 case XFRM_MSG_FLUSHSA:
3010 return xfrm_notify_sa_flush(c);
3011 default:
3012 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
3013 c->event);
3014 break;
3015 }
3016
3017 return 0;
3018
3019}
3020
3021static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
3022 struct xfrm_policy *xp)
3023{
3024 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
3025 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3026 + nla_total_size(sizeof(struct xfrm_mark))
3027 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
3028 + userpolicy_type_attrsize();
3029}
3030
3031static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
3032 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
3033{
3034 __u32 seq = xfrm_get_acqseq();
3035 struct xfrm_user_acquire *ua;
3036 struct nlmsghdr *nlh;
3037 int err;
3038
3039 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
3040 if (nlh == NULL)
3041 return -EMSGSIZE;
3042
3043 ua = nlmsg_data(nlh);
3044 memcpy(&ua->id, &x->id, sizeof(ua->id));
3045 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
3046 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
3047 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
3048 ua->aalgos = xt->aalgos;
3049 ua->ealgos = xt->ealgos;
3050 ua->calgos = xt->calgos;
3051 ua->seq = x->km.seq = seq;
3052
3053 err = copy_to_user_tmpl(xp, skb);
3054 if (!err)
3055 err = copy_to_user_state_sec_ctx(x, skb);
3056 if (!err)
3057 err = copy_to_user_policy_type(xp->type, skb);
3058 if (!err)
3059 err = xfrm_mark_put(skb, &xp->mark);
3060 if (!err)
3061 err = xfrm_if_id_put(skb, xp->if_id);
3062 if (err) {
3063 nlmsg_cancel(skb, nlh);
3064 return err;
3065 }
3066
3067 nlmsg_end(skb, nlh);
3068 return 0;
3069}
3070
3071static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
3072 struct xfrm_policy *xp)
3073{
3074 struct net *net = xs_net(x);
3075 struct sk_buff *skb;
3076 int err;
3077
3078 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
3079 if (skb == NULL)
3080 return -ENOMEM;
3081
3082 err = build_acquire(skb, x, xt, xp);
3083 BUG_ON(err < 0);
3084
3085 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
3086}
3087
3088/* User gives us xfrm_user_policy_info followed by an array of 0
3089 * or more templates.
3090 */
3091static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
3092 u8 *data, int len, int *dir)
3093{
3094 struct net *net = sock_net(sk);
3095 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
3096 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
3097 struct xfrm_policy *xp;
3098 int nr;
3099
3100 switch (sk->sk_family) {
3101 case AF_INET:
3102 if (opt != IP_XFRM_POLICY) {
3103 *dir = -EOPNOTSUPP;
3104 return NULL;
3105 }
3106 break;
3107#if IS_ENABLED(CONFIG_IPV6)
3108 case AF_INET6:
3109 if (opt != IPV6_XFRM_POLICY) {
3110 *dir = -EOPNOTSUPP;
3111 return NULL;
3112 }
3113 break;
3114#endif
3115 default:
3116 *dir = -EINVAL;
3117 return NULL;
3118 }
3119
3120 *dir = -EINVAL;
3121
3122 if (len < sizeof(*p) ||
3123 verify_newpolicy_info(p))
3124 return NULL;
3125
3126 nr = ((len - sizeof(*p)) / sizeof(*ut));
3127 if (validate_tmpl(nr, ut, p->sel.family))
3128 return NULL;
3129
3130 if (p->dir > XFRM_POLICY_OUT)
3131 return NULL;
3132
3133 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3134 if (xp == NULL) {
3135 *dir = -ENOBUFS;
3136 return NULL;
3137 }
3138
3139 copy_from_user_policy(xp, p);
3140 xp->type = XFRM_POLICY_TYPE_MAIN;
3141 copy_templates(xp, ut, nr);
3142
3143 *dir = p->dir;
3144
3145 return xp;
3146}
3147
3148static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
3149{
3150 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
3151 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
3152 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
3153 + nla_total_size(sizeof(struct xfrm_mark))
3154 + userpolicy_type_attrsize();
3155}
3156
3157static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
3158 int dir, const struct km_event *c)
3159{
3160 struct xfrm_user_polexpire *upe;
3161 int hard = c->data.hard;
3162 struct nlmsghdr *nlh;
3163 int err;
3164
3165 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
3166 if (nlh == NULL)
3167 return -EMSGSIZE;
3168
3169 upe = nlmsg_data(nlh);
3170 copy_to_user_policy(xp, &upe->pol, dir);
3171 err = copy_to_user_tmpl(xp, skb);
3172 if (!err)
3173 err = copy_to_user_sec_ctx(xp, skb);
3174 if (!err)
3175 err = copy_to_user_policy_type(xp->type, skb);
3176 if (!err)
3177 err = xfrm_mark_put(skb, &xp->mark);
3178 if (!err)
3179 err = xfrm_if_id_put(skb, xp->if_id);
3180 if (err) {
3181 nlmsg_cancel(skb, nlh);
3182 return err;
3183 }
3184 upe->hard = !!hard;
3185
3186 nlmsg_end(skb, nlh);
3187 return 0;
3188}
3189
3190static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3191{
3192 struct net *net = xp_net(xp);
3193 struct sk_buff *skb;
3194 int err;
3195
3196 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
3197 if (skb == NULL)
3198 return -ENOMEM;
3199
3200 err = build_polexpire(skb, xp, dir, c);
3201 BUG_ON(err < 0);
3202
3203 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
3204}
3205
3206static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
3207{
3208 unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
3209 struct net *net = xp_net(xp);
3210 struct xfrm_userpolicy_info *p;
3211 struct xfrm_userpolicy_id *id;
3212 struct nlmsghdr *nlh;
3213 struct sk_buff *skb;
3214 unsigned int headlen;
3215 int err;
3216
3217 headlen = sizeof(*p);
3218 if (c->event == XFRM_MSG_DELPOLICY) {
3219 len += nla_total_size(headlen);
3220 headlen = sizeof(*id);
3221 }
3222 len += userpolicy_type_attrsize();
3223 len += nla_total_size(sizeof(struct xfrm_mark));
3224 len += NLMSG_ALIGN(headlen);
3225
3226 skb = nlmsg_new(len, GFP_ATOMIC);
3227 if (skb == NULL)
3228 return -ENOMEM;
3229
3230 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3231 err = -EMSGSIZE;
3232 if (nlh == NULL)
3233 goto out_free_skb;
3234
3235 p = nlmsg_data(nlh);
3236 if (c->event == XFRM_MSG_DELPOLICY) {
3237 struct nlattr *attr;
3238
3239 id = nlmsg_data(nlh);
3240 memset(id, 0, sizeof(*id));
3241 id->dir = dir;
3242 if (c->data.byid)
3243 id->index = xp->index;
3244 else
3245 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3246
3247 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3248 err = -EMSGSIZE;
3249 if (attr == NULL)
3250 goto out_free_skb;
3251
3252 p = nla_data(attr);
3253 }
3254
3255 copy_to_user_policy(xp, p, dir);
3256 err = copy_to_user_tmpl(xp, skb);
3257 if (!err)
3258 err = copy_to_user_policy_type(xp->type, skb);
3259 if (!err)
3260 err = xfrm_mark_put(skb, &xp->mark);
3261 if (!err)
3262 err = xfrm_if_id_put(skb, xp->if_id);
3263 if (err)
3264 goto out_free_skb;
3265
3266 nlmsg_end(skb, nlh);
3267
3268 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3269
3270out_free_skb:
3271 kfree_skb(skb);
3272 return err;
3273}
3274
3275static int xfrm_notify_policy_flush(const struct km_event *c)
3276{
3277 struct net *net = c->net;
3278 struct nlmsghdr *nlh;
3279 struct sk_buff *skb;
3280 int err;
3281
3282 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3283 if (skb == NULL)
3284 return -ENOMEM;
3285
3286 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3287 err = -EMSGSIZE;
3288 if (nlh == NULL)
3289 goto out_free_skb;
3290 err = copy_to_user_policy_type(c->data.type, skb);
3291 if (err)
3292 goto out_free_skb;
3293
3294 nlmsg_end(skb, nlh);
3295
3296 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3297
3298out_free_skb:
3299 kfree_skb(skb);
3300 return err;
3301}
3302
3303static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3304{
3305
3306 switch (c->event) {
3307 case XFRM_MSG_NEWPOLICY:
3308 case XFRM_MSG_UPDPOLICY:
3309 case XFRM_MSG_DELPOLICY:
3310 return xfrm_notify_policy(xp, dir, c);
3311 case XFRM_MSG_FLUSHPOLICY:
3312 return xfrm_notify_policy_flush(c);
3313 case XFRM_MSG_POLEXPIRE:
3314 return xfrm_exp_policy_notify(xp, dir, c);
3315 default:
3316 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3317 c->event);
3318 }
3319
3320 return 0;
3321
3322}
3323
3324static inline unsigned int xfrm_report_msgsize(void)
3325{
3326 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3327}
3328
3329static int build_report(struct sk_buff *skb, u8 proto,
3330 struct xfrm_selector *sel, xfrm_address_t *addr)
3331{
3332 struct xfrm_user_report *ur;
3333 struct nlmsghdr *nlh;
3334
3335 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3336 if (nlh == NULL)
3337 return -EMSGSIZE;
3338
3339 ur = nlmsg_data(nlh);
3340 ur->proto = proto;
3341 memcpy(&ur->sel, sel, sizeof(ur->sel));
3342
3343 if (addr) {
3344 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3345 if (err) {
3346 nlmsg_cancel(skb, nlh);
3347 return err;
3348 }
3349 }
3350 nlmsg_end(skb, nlh);
3351 return 0;
3352}
3353
3354static int xfrm_send_report(struct net *net, u8 proto,
3355 struct xfrm_selector *sel, xfrm_address_t *addr)
3356{
3357 struct sk_buff *skb;
3358 int err;
3359
3360 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3361 if (skb == NULL)
3362 return -ENOMEM;
3363
3364 err = build_report(skb, proto, sel, addr);
3365 BUG_ON(err < 0);
3366
3367 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3368}
3369
3370static inline unsigned int xfrm_mapping_msgsize(void)
3371{
3372 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3373}
3374
3375static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3376 xfrm_address_t *new_saddr, __be16 new_sport)
3377{
3378 struct xfrm_user_mapping *um;
3379 struct nlmsghdr *nlh;
3380
3381 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3382 if (nlh == NULL)
3383 return -EMSGSIZE;
3384
3385 um = nlmsg_data(nlh);
3386
3387 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3388 um->id.spi = x->id.spi;
3389 um->id.family = x->props.family;
3390 um->id.proto = x->id.proto;
3391 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3392 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3393 um->new_sport = new_sport;
3394 um->old_sport = x->encap->encap_sport;
3395 um->reqid = x->props.reqid;
3396
3397 nlmsg_end(skb, nlh);
3398 return 0;
3399}
3400
3401static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3402 __be16 sport)
3403{
3404 struct net *net = xs_net(x);
3405 struct sk_buff *skb;
3406 int err;
3407
3408 if (x->id.proto != IPPROTO_ESP)
3409 return -EINVAL;
3410
3411 if (!x->encap)
3412 return -EINVAL;
3413
3414 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3415 if (skb == NULL)
3416 return -ENOMEM;
3417
3418 err = build_mapping(skb, x, ipaddr, sport);
3419 BUG_ON(err < 0);
3420
3421 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3422}
3423
3424static bool xfrm_is_alive(const struct km_event *c)
3425{
3426 return (bool)xfrm_acquire_is_on(c->net);
3427}
3428
3429static struct xfrm_mgr netlink_mgr = {
3430 .notify = xfrm_send_state_notify,
3431 .acquire = xfrm_send_acquire,
3432 .compile_policy = xfrm_compile_policy,
3433 .notify_policy = xfrm_send_policy_notify,
3434 .report = xfrm_send_report,
3435 .migrate = xfrm_send_migrate,
3436 .new_mapping = xfrm_send_mapping,
3437 .is_alive = xfrm_is_alive,
3438};
3439
3440static int __net_init xfrm_user_net_init(struct net *net)
3441{
3442 struct sock *nlsk;
3443 struct netlink_kernel_cfg cfg = {
3444 .groups = XFRMNLGRP_MAX,
3445 .input = xfrm_netlink_rcv,
3446 };
3447
3448 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3449 if (nlsk == NULL)
3450 return -ENOMEM;
3451 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3452 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3453 return 0;
3454}
3455
3456static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3457{
3458 struct net *net;
3459 list_for_each_entry(net, net_exit_list, exit_list)
3460 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3461 synchronize_net();
3462 list_for_each_entry(net, net_exit_list, exit_list)
3463 netlink_kernel_release(net->xfrm.nlsk_stash);
3464}
3465
3466static struct pernet_operations xfrm_user_net_ops = {
3467 .init = xfrm_user_net_init,
3468 .exit_batch = xfrm_user_net_exit,
3469};
3470
3471static int __init xfrm_user_init(void)
3472{
3473 int rv;
3474
3475 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3476
3477 rv = register_pernet_subsys(&xfrm_user_net_ops);
3478 if (rv < 0)
3479 return rv;
3480 rv = xfrm_register_km(&netlink_mgr);
3481 if (rv < 0)
3482 unregister_pernet_subsys(&xfrm_user_net_ops);
3483 return rv;
3484}
3485
3486static void __exit xfrm_user_exit(void)
3487{
3488 xfrm_unregister_km(&netlink_mgr);
3489 unregister_pernet_subsys(&xfrm_user_net_ops);
3490}
3491
3492module_init(xfrm_user_init);
3493module_exit(xfrm_user_exit);
3494MODULE_LICENSE("GPL");
3495MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);