1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <asm/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34
verify_one_alg(struct nlattr ** attrs,enum xfrm_attr_type_t type)35 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
36 {
37 struct nlattr *rt = attrs[type];
38 struct xfrm_algo *algp;
39
40 if (!rt)
41 return 0;
42
43 algp = nla_data(rt);
44 if (nla_len(rt) < xfrm_alg_len(algp))
45 return -EINVAL;
46
47 switch (type) {
48 case XFRMA_ALG_AUTH:
49 case XFRMA_ALG_CRYPT:
50 case XFRMA_ALG_COMP:
51 break;
52
53 default:
54 return -EINVAL;
55 }
56
57 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
58 return 0;
59 }
60
verify_auth_trunc(struct nlattr ** attrs)61 static int verify_auth_trunc(struct nlattr **attrs)
62 {
63 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
64 struct xfrm_algo_auth *algp;
65
66 if (!rt)
67 return 0;
68
69 algp = nla_data(rt);
70 if (nla_len(rt) < xfrm_alg_auth_len(algp))
71 return -EINVAL;
72
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 return 0;
75 }
76
verify_aead(struct nlattr ** attrs)77 static int verify_aead(struct nlattr **attrs)
78 {
79 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
80 struct xfrm_algo_aead *algp;
81
82 if (!rt)
83 return 0;
84
85 algp = nla_data(rt);
86 if (nla_len(rt) < aead_len(algp))
87 return -EINVAL;
88
89 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
90 return 0;
91 }
92
verify_one_addr(struct nlattr ** attrs,enum xfrm_attr_type_t type,xfrm_address_t ** addrp)93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
94 xfrm_address_t **addrp)
95 {
96 struct nlattr *rt = attrs[type];
97
98 if (rt && addrp)
99 *addrp = nla_data(rt);
100 }
101
verify_sec_ctx_len(struct nlattr ** attrs)102 static inline int verify_sec_ctx_len(struct nlattr **attrs)
103 {
104 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
105 struct xfrm_user_sec_ctx *uctx;
106
107 if (!rt)
108 return 0;
109
110 uctx = nla_data(rt);
111 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
112 return -EINVAL;
113
114 return 0;
115 }
116
verify_replay(struct xfrm_usersa_info * p,struct nlattr ** attrs)117 static inline int verify_replay(struct xfrm_usersa_info *p,
118 struct nlattr **attrs)
119 {
120 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
121 struct xfrm_replay_state_esn *rs;
122
123 if (p->flags & XFRM_STATE_ESN) {
124 if (!rt)
125 return -EINVAL;
126
127 rs = nla_data(rt);
128
129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130 return -EINVAL;
131
132 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133 nla_len(rt) != sizeof(*rs))
134 return -EINVAL;
135 }
136
137 if (!rt)
138 return 0;
139
140 /* As only ESP and AH support ESN feature. */
141 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
142 return -EINVAL;
143
144 if (p->replay_window != 0)
145 return -EINVAL;
146
147 return 0;
148 }
149
verify_newsa_info(struct xfrm_usersa_info * p,struct nlattr ** attrs)150 static int verify_newsa_info(struct xfrm_usersa_info *p,
151 struct nlattr **attrs)
152 {
153 int err;
154
155 err = -EINVAL;
156 switch (p->family) {
157 case AF_INET:
158 break;
159
160 case AF_INET6:
161 #if IS_ENABLED(CONFIG_IPV6)
162 break;
163 #else
164 err = -EAFNOSUPPORT;
165 goto out;
166 #endif
167
168 default:
169 goto out;
170 }
171
172 err = -EINVAL;
173 switch (p->id.proto) {
174 case IPPROTO_AH:
175 if ((!attrs[XFRMA_ALG_AUTH] &&
176 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
177 attrs[XFRMA_ALG_AEAD] ||
178 attrs[XFRMA_ALG_CRYPT] ||
179 attrs[XFRMA_ALG_COMP] ||
180 attrs[XFRMA_TFCPAD])
181 goto out;
182 break;
183
184 case IPPROTO_ESP:
185 if (attrs[XFRMA_ALG_COMP])
186 goto out;
187 if (!attrs[XFRMA_ALG_AUTH] &&
188 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
189 !attrs[XFRMA_ALG_CRYPT] &&
190 !attrs[XFRMA_ALG_AEAD])
191 goto out;
192 if ((attrs[XFRMA_ALG_AUTH] ||
193 attrs[XFRMA_ALG_AUTH_TRUNC] ||
194 attrs[XFRMA_ALG_CRYPT]) &&
195 attrs[XFRMA_ALG_AEAD])
196 goto out;
197 if (attrs[XFRMA_TFCPAD] &&
198 p->mode != XFRM_MODE_TUNNEL)
199 goto out;
200 break;
201
202 case IPPROTO_COMP:
203 if (!attrs[XFRMA_ALG_COMP] ||
204 attrs[XFRMA_ALG_AEAD] ||
205 attrs[XFRMA_ALG_AUTH] ||
206 attrs[XFRMA_ALG_AUTH_TRUNC] ||
207 attrs[XFRMA_ALG_CRYPT] ||
208 attrs[XFRMA_TFCPAD] ||
209 (ntohl(p->id.spi) >= 0x10000))
210 goto out;
211 break;
212
213 #if IS_ENABLED(CONFIG_IPV6)
214 case IPPROTO_DSTOPTS:
215 case IPPROTO_ROUTING:
216 if (attrs[XFRMA_ALG_COMP] ||
217 attrs[XFRMA_ALG_AUTH] ||
218 attrs[XFRMA_ALG_AUTH_TRUNC] ||
219 attrs[XFRMA_ALG_AEAD] ||
220 attrs[XFRMA_ALG_CRYPT] ||
221 attrs[XFRMA_ENCAP] ||
222 attrs[XFRMA_SEC_CTX] ||
223 attrs[XFRMA_TFCPAD] ||
224 !attrs[XFRMA_COADDR])
225 goto out;
226 break;
227 #endif
228
229 default:
230 goto out;
231 }
232
233 if ((err = verify_aead(attrs)))
234 goto out;
235 if ((err = verify_auth_trunc(attrs)))
236 goto out;
237 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
238 goto out;
239 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
240 goto out;
241 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
242 goto out;
243 if ((err = verify_sec_ctx_len(attrs)))
244 goto out;
245 if ((err = verify_replay(p, attrs)))
246 goto out;
247
248 err = -EINVAL;
249 switch (p->mode) {
250 case XFRM_MODE_TRANSPORT:
251 case XFRM_MODE_TUNNEL:
252 case XFRM_MODE_ROUTEOPTIMIZATION:
253 case XFRM_MODE_BEET:
254 break;
255
256 default:
257 goto out;
258 }
259
260 err = 0;
261
262 out:
263 return err;
264 }
265
attach_one_algo(struct xfrm_algo ** algpp,u8 * props,struct xfrm_algo_desc * (* get_byname)(const char *,int),struct nlattr * rta)266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
267 struct xfrm_algo_desc *(*get_byname)(const char *, int),
268 struct nlattr *rta)
269 {
270 struct xfrm_algo *p, *ualg;
271 struct xfrm_algo_desc *algo;
272
273 if (!rta)
274 return 0;
275
276 ualg = nla_data(rta);
277
278 algo = get_byname(ualg->alg_name, 1);
279 if (!algo)
280 return -ENOSYS;
281 *props = algo->desc.sadb_alg_id;
282
283 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
284 if (!p)
285 return -ENOMEM;
286
287 strcpy(p->alg_name, algo->name);
288 *algpp = p;
289 return 0;
290 }
291
attach_auth(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta)292 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
293 struct nlattr *rta)
294 {
295 struct xfrm_algo *ualg;
296 struct xfrm_algo_auth *p;
297 struct xfrm_algo_desc *algo;
298
299 if (!rta)
300 return 0;
301
302 ualg = nla_data(rta);
303
304 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
305 if (!algo)
306 return -ENOSYS;
307 *props = algo->desc.sadb_alg_id;
308
309 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
310 if (!p)
311 return -ENOMEM;
312
313 strcpy(p->alg_name, algo->name);
314 p->alg_key_len = ualg->alg_key_len;
315 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
316 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
317
318 *algpp = p;
319 return 0;
320 }
321
attach_auth_trunc(struct xfrm_algo_auth ** algpp,u8 * props,struct nlattr * rta)322 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
323 struct nlattr *rta)
324 {
325 struct xfrm_algo_auth *p, *ualg;
326 struct xfrm_algo_desc *algo;
327
328 if (!rta)
329 return 0;
330
331 ualg = nla_data(rta);
332
333 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
334 if (!algo)
335 return -ENOSYS;
336 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
337 return -EINVAL;
338 *props = algo->desc.sadb_alg_id;
339
340 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
341 if (!p)
342 return -ENOMEM;
343
344 strcpy(p->alg_name, algo->name);
345 if (!p->alg_trunc_len)
346 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
347
348 *algpp = p;
349 return 0;
350 }
351
attach_aead(struct xfrm_algo_aead ** algpp,u8 * props,struct nlattr * rta)352 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
353 struct nlattr *rta)
354 {
355 struct xfrm_algo_aead *p, *ualg;
356 struct xfrm_algo_desc *algo;
357
358 if (!rta)
359 return 0;
360
361 ualg = nla_data(rta);
362
363 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
364 if (!algo)
365 return -ENOSYS;
366 *props = algo->desc.sadb_alg_id;
367
368 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
369 if (!p)
370 return -ENOMEM;
371
372 strcpy(p->alg_name, algo->name);
373 *algpp = p;
374 return 0;
375 }
376
xfrm_replay_verify_len(struct xfrm_replay_state_esn * replay_esn,struct nlattr * rp)377 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
378 struct nlattr *rp)
379 {
380 struct xfrm_replay_state_esn *up;
381 int ulen;
382
383 if (!replay_esn || !rp)
384 return 0;
385
386 up = nla_data(rp);
387 ulen = xfrm_replay_state_esn_len(up);
388
389 /* Check the overall length and the internal bitmap length to avoid
390 * potential overflow. */
391 if (nla_len(rp) < ulen ||
392 xfrm_replay_state_esn_len(replay_esn) != ulen ||
393 replay_esn->bmp_len != up->bmp_len)
394 return -EINVAL;
395
396 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
397 return -EINVAL;
398
399 return 0;
400 }
401
xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn ** replay_esn,struct xfrm_replay_state_esn ** preplay_esn,struct nlattr * rta)402 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
403 struct xfrm_replay_state_esn **preplay_esn,
404 struct nlattr *rta)
405 {
406 struct xfrm_replay_state_esn *p, *pp, *up;
407 int klen, ulen;
408
409 if (!rta)
410 return 0;
411
412 up = nla_data(rta);
413 klen = xfrm_replay_state_esn_len(up);
414 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
415
416 p = kzalloc(klen, GFP_KERNEL);
417 if (!p)
418 return -ENOMEM;
419
420 pp = kzalloc(klen, GFP_KERNEL);
421 if (!pp) {
422 kfree(p);
423 return -ENOMEM;
424 }
425
426 memcpy(p, up, ulen);
427 memcpy(pp, up, ulen);
428
429 *replay_esn = p;
430 *preplay_esn = pp;
431
432 return 0;
433 }
434
xfrm_user_sec_ctx_size(struct xfrm_sec_ctx * xfrm_ctx)435 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
436 {
437 int len = 0;
438
439 if (xfrm_ctx) {
440 len += sizeof(struct xfrm_user_sec_ctx);
441 len += xfrm_ctx->ctx_len;
442 }
443 return len;
444 }
445
copy_from_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)446 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
447 {
448 memcpy(&x->id, &p->id, sizeof(x->id));
449 memcpy(&x->sel, &p->sel, sizeof(x->sel));
450 memcpy(&x->lft, &p->lft, sizeof(x->lft));
451 x->props.mode = p->mode;
452 x->props.replay_window = min_t(unsigned int, p->replay_window,
453 sizeof(x->replay.bitmap) * 8);
454 x->props.reqid = p->reqid;
455 x->props.family = p->family;
456 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
457 x->props.flags = p->flags;
458
459 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
460 x->sel.family = p->family;
461 }
462
463 /*
464 * someday when pfkey also has support, we could have the code
465 * somehow made shareable and move it to xfrm_state.c - JHS
466 *
467 */
xfrm_update_ae_params(struct xfrm_state * x,struct nlattr ** attrs,int update_esn)468 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
469 int update_esn)
470 {
471 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
472 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
473 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
474 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
475 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
476
477 if (re) {
478 struct xfrm_replay_state_esn *replay_esn;
479 replay_esn = nla_data(re);
480 memcpy(x->replay_esn, replay_esn,
481 xfrm_replay_state_esn_len(replay_esn));
482 memcpy(x->preplay_esn, replay_esn,
483 xfrm_replay_state_esn_len(replay_esn));
484 }
485
486 if (rp) {
487 struct xfrm_replay_state *replay;
488 replay = nla_data(rp);
489 memcpy(&x->replay, replay, sizeof(*replay));
490 memcpy(&x->preplay, replay, sizeof(*replay));
491 }
492
493 if (lt) {
494 struct xfrm_lifetime_cur *ltime;
495 ltime = nla_data(lt);
496 x->curlft.bytes = ltime->bytes;
497 x->curlft.packets = ltime->packets;
498 x->curlft.add_time = ltime->add_time;
499 x->curlft.use_time = ltime->use_time;
500 }
501
502 if (et)
503 x->replay_maxage = nla_get_u32(et);
504
505 if (rt)
506 x->replay_maxdiff = nla_get_u32(rt);
507 }
508
xfrm_state_construct(struct net * net,struct xfrm_usersa_info * p,struct nlattr ** attrs,int * errp)509 static struct xfrm_state *xfrm_state_construct(struct net *net,
510 struct xfrm_usersa_info *p,
511 struct nlattr **attrs,
512 int *errp)
513 {
514 struct xfrm_state *x = xfrm_state_alloc(net);
515 int err = -ENOMEM;
516
517 if (!x)
518 goto error_no_put;
519
520 copy_from_user_state(x, p);
521
522 if (attrs[XFRMA_SA_EXTRA_FLAGS])
523 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
524
525 if ((err = attach_aead(&x->aead, &x->props.ealgo,
526 attrs[XFRMA_ALG_AEAD])))
527 goto error;
528 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
529 attrs[XFRMA_ALG_AUTH_TRUNC])))
530 goto error;
531 if (!x->props.aalgo) {
532 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
533 attrs[XFRMA_ALG_AUTH])))
534 goto error;
535 }
536 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
537 xfrm_ealg_get_byname,
538 attrs[XFRMA_ALG_CRYPT])))
539 goto error;
540 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
541 xfrm_calg_get_byname,
542 attrs[XFRMA_ALG_COMP])))
543 goto error;
544
545 if (attrs[XFRMA_ENCAP]) {
546 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
547 sizeof(*x->encap), GFP_KERNEL);
548 if (x->encap == NULL)
549 goto error;
550 }
551
552 if (attrs[XFRMA_TFCPAD])
553 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
554
555 if (attrs[XFRMA_COADDR]) {
556 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
557 sizeof(*x->coaddr), GFP_KERNEL);
558 if (x->coaddr == NULL)
559 goto error;
560 }
561
562 xfrm_mark_get(attrs, &x->mark);
563
564 if (attrs[XFRMA_OUTPUT_MARK])
565 x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]);
566
567 err = __xfrm_init_state(x, false);
568 if (err)
569 goto error;
570
571 if (attrs[XFRMA_SEC_CTX] &&
572 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
573 goto error;
574
575 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
576 attrs[XFRMA_REPLAY_ESN_VAL])))
577 goto error;
578
579 x->km.seq = p->seq;
580 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
581 /* sysctl_xfrm_aevent_etime is in 100ms units */
582 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
583
584 if ((err = xfrm_init_replay(x)))
585 goto error;
586
587 /* override default values from above */
588 xfrm_update_ae_params(x, attrs, 0);
589
590 return x;
591
592 error:
593 x->km.state = XFRM_STATE_DEAD;
594 xfrm_state_put(x);
595 error_no_put:
596 *errp = err;
597 return NULL;
598 }
599
xfrm_add_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)600 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
601 struct nlattr **attrs)
602 {
603 struct net *net = sock_net(skb->sk);
604 struct xfrm_usersa_info *p = nlmsg_data(nlh);
605 struct xfrm_state *x;
606 int err;
607 struct km_event c;
608
609 err = verify_newsa_info(p, attrs);
610 if (err)
611 return err;
612
613 x = xfrm_state_construct(net, p, attrs, &err);
614 if (!x)
615 return err;
616
617 xfrm_state_hold(x);
618 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
619 err = xfrm_state_add(x);
620 else
621 err = xfrm_state_update(x);
622
623 xfrm_audit_state_add(x, err ? 0 : 1, true);
624
625 if (err < 0) {
626 x->km.state = XFRM_STATE_DEAD;
627 __xfrm_state_put(x);
628 goto out;
629 }
630
631 c.seq = nlh->nlmsg_seq;
632 c.portid = nlh->nlmsg_pid;
633 c.event = nlh->nlmsg_type;
634
635 km_state_notify(x, &c);
636 out:
637 xfrm_state_put(x);
638 return err;
639 }
640
xfrm_user_state_lookup(struct net * net,struct xfrm_usersa_id * p,struct nlattr ** attrs,int * errp)641 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
642 struct xfrm_usersa_id *p,
643 struct nlattr **attrs,
644 int *errp)
645 {
646 struct xfrm_state *x = NULL;
647 struct xfrm_mark m;
648 int err;
649 u32 mark = xfrm_mark_get(attrs, &m);
650
651 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
652 err = -ESRCH;
653 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
654 } else {
655 xfrm_address_t *saddr = NULL;
656
657 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
658 if (!saddr) {
659 err = -EINVAL;
660 goto out;
661 }
662
663 err = -ESRCH;
664 x = xfrm_state_lookup_byaddr(net, mark,
665 &p->daddr, saddr,
666 p->proto, p->family);
667 }
668
669 out:
670 if (!x && errp)
671 *errp = err;
672 return x;
673 }
674
xfrm_del_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)675 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
676 struct nlattr **attrs)
677 {
678 struct net *net = sock_net(skb->sk);
679 struct xfrm_state *x;
680 int err = -ESRCH;
681 struct km_event c;
682 struct xfrm_usersa_id *p = nlmsg_data(nlh);
683
684 x = xfrm_user_state_lookup(net, p, attrs, &err);
685 if (x == NULL)
686 return err;
687
688 if ((err = security_xfrm_state_delete(x)) != 0)
689 goto out;
690
691 if (xfrm_state_kern(x)) {
692 err = -EPERM;
693 goto out;
694 }
695
696 err = xfrm_state_delete(x);
697
698 if (err < 0)
699 goto out;
700
701 c.seq = nlh->nlmsg_seq;
702 c.portid = nlh->nlmsg_pid;
703 c.event = nlh->nlmsg_type;
704 km_state_notify(x, &c);
705
706 out:
707 xfrm_audit_state_delete(x, err ? 0 : 1, true);
708 xfrm_state_put(x);
709 return err;
710 }
711
copy_to_user_state(struct xfrm_state * x,struct xfrm_usersa_info * p)712 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
713 {
714 memset(p, 0, sizeof(*p));
715 memcpy(&p->id, &x->id, sizeof(p->id));
716 memcpy(&p->sel, &x->sel, sizeof(p->sel));
717 memcpy(&p->lft, &x->lft, sizeof(p->lft));
718 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
719 memcpy(&p->stats, &x->stats, sizeof(p->stats));
720 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
721 p->mode = x->props.mode;
722 p->replay_window = x->props.replay_window;
723 p->reqid = x->props.reqid;
724 p->family = x->props.family;
725 p->flags = x->props.flags;
726 p->seq = x->km.seq;
727 }
728
729 struct xfrm_dump_info {
730 struct sk_buff *in_skb;
731 struct sk_buff *out_skb;
732 u32 nlmsg_seq;
733 u16 nlmsg_flags;
734 };
735
copy_sec_ctx(struct xfrm_sec_ctx * s,struct sk_buff * skb)736 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
737 {
738 struct xfrm_user_sec_ctx *uctx;
739 struct nlattr *attr;
740 int ctx_size = sizeof(*uctx) + s->ctx_len;
741
742 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
743 if (attr == NULL)
744 return -EMSGSIZE;
745
746 uctx = nla_data(attr);
747 uctx->exttype = XFRMA_SEC_CTX;
748 uctx->len = ctx_size;
749 uctx->ctx_doi = s->ctx_doi;
750 uctx->ctx_alg = s->ctx_alg;
751 uctx->ctx_len = s->ctx_len;
752 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
753
754 return 0;
755 }
756
copy_to_user_auth(struct xfrm_algo_auth * auth,struct sk_buff * skb)757 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
758 {
759 struct xfrm_algo *algo;
760 struct nlattr *nla;
761
762 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
763 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
764 if (!nla)
765 return -EMSGSIZE;
766
767 algo = nla_data(nla);
768 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
769 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
770 algo->alg_key_len = auth->alg_key_len;
771
772 return 0;
773 }
774
775 /* Don't change this without updating xfrm_sa_len! */
copy_to_user_state_extra(struct xfrm_state * x,struct xfrm_usersa_info * p,struct sk_buff * skb)776 static int copy_to_user_state_extra(struct xfrm_state *x,
777 struct xfrm_usersa_info *p,
778 struct sk_buff *skb)
779 {
780 int ret = 0;
781
782 copy_to_user_state(x, p);
783
784 if (x->props.extra_flags) {
785 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
786 x->props.extra_flags);
787 if (ret)
788 goto out;
789 }
790
791 if (x->coaddr) {
792 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
793 if (ret)
794 goto out;
795 }
796 if (x->lastused) {
797 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
798 if (ret)
799 goto out;
800 }
801 if (x->aead) {
802 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
803 if (ret)
804 goto out;
805 }
806 if (x->aalg) {
807 ret = copy_to_user_auth(x->aalg, skb);
808 if (!ret)
809 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
810 xfrm_alg_auth_len(x->aalg), x->aalg);
811 if (ret)
812 goto out;
813 }
814 if (x->ealg) {
815 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
816 if (ret)
817 goto out;
818 }
819 if (x->calg) {
820 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
821 if (ret)
822 goto out;
823 }
824 if (x->encap) {
825 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
826 if (ret)
827 goto out;
828 }
829 if (x->tfcpad) {
830 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
831 if (ret)
832 goto out;
833 }
834 ret = xfrm_mark_put(skb, &x->mark);
835 if (ret)
836 goto out;
837 if (x->replay_esn) {
838 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
839 xfrm_replay_state_esn_len(x->replay_esn),
840 x->replay_esn);
841 if (ret)
842 goto out;
843 }
844 if (x->security)
845 ret = copy_sec_ctx(x->security, skb);
846 if (x->props.output_mark) {
847 ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
848 if (ret)
849 goto out;
850 }
851 out:
852 return ret;
853 }
854
dump_one_state(struct xfrm_state * x,int count,void * ptr)855 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
856 {
857 struct xfrm_dump_info *sp = ptr;
858 struct sk_buff *in_skb = sp->in_skb;
859 struct sk_buff *skb = sp->out_skb;
860 struct xfrm_usersa_info *p;
861 struct nlmsghdr *nlh;
862 int err;
863
864 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
865 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
866 if (nlh == NULL)
867 return -EMSGSIZE;
868
869 p = nlmsg_data(nlh);
870
871 err = copy_to_user_state_extra(x, p, skb);
872 if (err) {
873 nlmsg_cancel(skb, nlh);
874 return err;
875 }
876 nlmsg_end(skb, nlh);
877 return 0;
878 }
879
xfrm_dump_sa_done(struct netlink_callback * cb)880 static int xfrm_dump_sa_done(struct netlink_callback *cb)
881 {
882 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
883 struct sock *sk = cb->skb->sk;
884 struct net *net = sock_net(sk);
885
886 xfrm_state_walk_done(walk, net);
887 return 0;
888 }
889
890 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
xfrm_dump_sa(struct sk_buff * skb,struct netlink_callback * cb)891 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
892 {
893 struct net *net = sock_net(skb->sk);
894 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
895 struct xfrm_dump_info info;
896
897 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
898 sizeof(cb->args) - sizeof(cb->args[0]));
899
900 info.in_skb = cb->skb;
901 info.out_skb = skb;
902 info.nlmsg_seq = cb->nlh->nlmsg_seq;
903 info.nlmsg_flags = NLM_F_MULTI;
904
905 if (!cb->args[0]) {
906 struct nlattr *attrs[XFRMA_MAX+1];
907 struct xfrm_address_filter *filter = NULL;
908 u8 proto = 0;
909 int err;
910
911 cb->args[0] = 1;
912
913 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
914 xfrma_policy);
915 if (err < 0)
916 return err;
917
918 if (attrs[XFRMA_ADDRESS_FILTER]) {
919 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
920 if (filter == NULL)
921 return -ENOMEM;
922
923 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
924 sizeof(*filter));
925 }
926
927 if (attrs[XFRMA_PROTO])
928 proto = nla_get_u8(attrs[XFRMA_PROTO]);
929
930 xfrm_state_walk_init(walk, proto, filter);
931 }
932
933 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
934
935 return skb->len;
936 }
937
xfrm_state_netlink(struct sk_buff * in_skb,struct xfrm_state * x,u32 seq)938 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
939 struct xfrm_state *x, u32 seq)
940 {
941 struct xfrm_dump_info info;
942 struct sk_buff *skb;
943 int err;
944
945 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
946 if (!skb)
947 return ERR_PTR(-ENOMEM);
948
949 info.in_skb = in_skb;
950 info.out_skb = skb;
951 info.nlmsg_seq = seq;
952 info.nlmsg_flags = 0;
953
954 err = dump_one_state(x, 0, &info);
955 if (err) {
956 kfree_skb(skb);
957 return ERR_PTR(err);
958 }
959
960 return skb;
961 }
962
963 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
964 * Must be called with RCU read lock.
965 */
xfrm_nlmsg_multicast(struct net * net,struct sk_buff * skb,u32 pid,unsigned int group)966 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
967 u32 pid, unsigned int group)
968 {
969 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
970
971 if (nlsk)
972 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
973 else
974 return -1;
975 }
976
xfrm_spdinfo_msgsize(void)977 static inline size_t xfrm_spdinfo_msgsize(void)
978 {
979 return NLMSG_ALIGN(4)
980 + nla_total_size(sizeof(struct xfrmu_spdinfo))
981 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
982 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
983 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
984 }
985
build_spdinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)986 static int build_spdinfo(struct sk_buff *skb, struct net *net,
987 u32 portid, u32 seq, u32 flags)
988 {
989 struct xfrmk_spdinfo si;
990 struct xfrmu_spdinfo spc;
991 struct xfrmu_spdhinfo sph;
992 struct xfrmu_spdhthresh spt4, spt6;
993 struct nlmsghdr *nlh;
994 int err;
995 u32 *f;
996 unsigned lseq;
997
998 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
999 if (nlh == NULL) /* shouldn't really happen ... */
1000 return -EMSGSIZE;
1001
1002 f = nlmsg_data(nlh);
1003 *f = flags;
1004 xfrm_spd_getinfo(net, &si);
1005 spc.incnt = si.incnt;
1006 spc.outcnt = si.outcnt;
1007 spc.fwdcnt = si.fwdcnt;
1008 spc.inscnt = si.inscnt;
1009 spc.outscnt = si.outscnt;
1010 spc.fwdscnt = si.fwdscnt;
1011 sph.spdhcnt = si.spdhcnt;
1012 sph.spdhmcnt = si.spdhmcnt;
1013
1014 do {
1015 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1016
1017 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1018 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1019 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1020 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1021 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1022
1023 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1024 if (!err)
1025 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1026 if (!err)
1027 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1028 if (!err)
1029 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1030 if (err) {
1031 nlmsg_cancel(skb, nlh);
1032 return err;
1033 }
1034
1035 return nlmsg_end(skb, nlh);
1036 }
1037
xfrm_set_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1038 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1039 struct nlattr **attrs)
1040 {
1041 struct net *net = sock_net(skb->sk);
1042 struct xfrmu_spdhthresh *thresh4 = NULL;
1043 struct xfrmu_spdhthresh *thresh6 = NULL;
1044
1045 /* selector prefixlen thresholds to hash policies */
1046 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1047 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1048
1049 if (nla_len(rta) < sizeof(*thresh4))
1050 return -EINVAL;
1051 thresh4 = nla_data(rta);
1052 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1053 return -EINVAL;
1054 }
1055 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1056 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1057
1058 if (nla_len(rta) < sizeof(*thresh6))
1059 return -EINVAL;
1060 thresh6 = nla_data(rta);
1061 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1062 return -EINVAL;
1063 }
1064
1065 if (thresh4 || thresh6) {
1066 write_seqlock(&net->xfrm.policy_hthresh.lock);
1067 if (thresh4) {
1068 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1069 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1070 }
1071 if (thresh6) {
1072 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1073 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1074 }
1075 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1076
1077 xfrm_policy_hash_rebuild(net);
1078 }
1079
1080 return 0;
1081 }
1082
xfrm_get_spdinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1083 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1084 struct nlattr **attrs)
1085 {
1086 struct net *net = sock_net(skb->sk);
1087 struct sk_buff *r_skb;
1088 u32 *flags = nlmsg_data(nlh);
1089 u32 sportid = NETLINK_CB(skb).portid;
1090 u32 seq = nlh->nlmsg_seq;
1091
1092 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1093 if (r_skb == NULL)
1094 return -ENOMEM;
1095
1096 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1097 BUG();
1098
1099 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1100 }
1101
xfrm_sadinfo_msgsize(void)1102 static inline size_t xfrm_sadinfo_msgsize(void)
1103 {
1104 return NLMSG_ALIGN(4)
1105 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1106 + nla_total_size(4); /* XFRMA_SAD_CNT */
1107 }
1108
build_sadinfo(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags)1109 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1110 u32 portid, u32 seq, u32 flags)
1111 {
1112 struct xfrmk_sadinfo si;
1113 struct xfrmu_sadhinfo sh;
1114 struct nlmsghdr *nlh;
1115 int err;
1116 u32 *f;
1117
1118 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1119 if (nlh == NULL) /* shouldn't really happen ... */
1120 return -EMSGSIZE;
1121
1122 f = nlmsg_data(nlh);
1123 *f = flags;
1124 xfrm_sad_getinfo(net, &si);
1125
1126 sh.sadhmcnt = si.sadhmcnt;
1127 sh.sadhcnt = si.sadhcnt;
1128
1129 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1130 if (!err)
1131 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1132 if (err) {
1133 nlmsg_cancel(skb, nlh);
1134 return err;
1135 }
1136
1137 return nlmsg_end(skb, nlh);
1138 }
1139
xfrm_get_sadinfo(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1140 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1141 struct nlattr **attrs)
1142 {
1143 struct net *net = sock_net(skb->sk);
1144 struct sk_buff *r_skb;
1145 u32 *flags = nlmsg_data(nlh);
1146 u32 sportid = NETLINK_CB(skb).portid;
1147 u32 seq = nlh->nlmsg_seq;
1148
1149 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1150 if (r_skb == NULL)
1151 return -ENOMEM;
1152
1153 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1154 BUG();
1155
1156 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1157 }
1158
xfrm_get_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1159 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1160 struct nlattr **attrs)
1161 {
1162 struct net *net = sock_net(skb->sk);
1163 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1164 struct xfrm_state *x;
1165 struct sk_buff *resp_skb;
1166 int err = -ESRCH;
1167
1168 x = xfrm_user_state_lookup(net, p, attrs, &err);
1169 if (x == NULL)
1170 goto out_noput;
1171
1172 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1173 if (IS_ERR(resp_skb)) {
1174 err = PTR_ERR(resp_skb);
1175 } else {
1176 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1177 }
1178 xfrm_state_put(x);
1179 out_noput:
1180 return err;
1181 }
1182
xfrm_alloc_userspi(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1183 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1184 struct nlattr **attrs)
1185 {
1186 struct net *net = sock_net(skb->sk);
1187 struct xfrm_state *x;
1188 struct xfrm_userspi_info *p;
1189 struct sk_buff *resp_skb;
1190 xfrm_address_t *daddr;
1191 int family;
1192 int err;
1193 u32 mark;
1194 struct xfrm_mark m;
1195
1196 p = nlmsg_data(nlh);
1197 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1198 if (err)
1199 goto out_noput;
1200
1201 family = p->info.family;
1202 daddr = &p->info.id.daddr;
1203
1204 x = NULL;
1205
1206 mark = xfrm_mark_get(attrs, &m);
1207 if (p->info.seq) {
1208 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1209 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1210 xfrm_state_put(x);
1211 x = NULL;
1212 }
1213 }
1214
1215 if (!x)
1216 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1217 p->info.id.proto, daddr,
1218 &p->info.saddr, 1,
1219 family);
1220 err = -ENOENT;
1221 if (x == NULL)
1222 goto out_noput;
1223
1224 err = xfrm_alloc_spi(x, p->min, p->max);
1225 if (err)
1226 goto out;
1227
1228 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1229 if (IS_ERR(resp_skb)) {
1230 err = PTR_ERR(resp_skb);
1231 goto out;
1232 }
1233
1234 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1235
1236 out:
1237 xfrm_state_put(x);
1238 out_noput:
1239 return err;
1240 }
1241
verify_policy_dir(u8 dir)1242 static int verify_policy_dir(u8 dir)
1243 {
1244 switch (dir) {
1245 case XFRM_POLICY_IN:
1246 case XFRM_POLICY_OUT:
1247 case XFRM_POLICY_FWD:
1248 break;
1249
1250 default:
1251 return -EINVAL;
1252 }
1253
1254 return 0;
1255 }
1256
verify_policy_type(u8 type)1257 static int verify_policy_type(u8 type)
1258 {
1259 switch (type) {
1260 case XFRM_POLICY_TYPE_MAIN:
1261 #ifdef CONFIG_XFRM_SUB_POLICY
1262 case XFRM_POLICY_TYPE_SUB:
1263 #endif
1264 break;
1265
1266 default:
1267 return -EINVAL;
1268 }
1269
1270 return 0;
1271 }
1272
verify_newpolicy_info(struct xfrm_userpolicy_info * p)1273 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1274 {
1275 int ret;
1276
1277 switch (p->share) {
1278 case XFRM_SHARE_ANY:
1279 case XFRM_SHARE_SESSION:
1280 case XFRM_SHARE_USER:
1281 case XFRM_SHARE_UNIQUE:
1282 break;
1283
1284 default:
1285 return -EINVAL;
1286 }
1287
1288 switch (p->action) {
1289 case XFRM_POLICY_ALLOW:
1290 case XFRM_POLICY_BLOCK:
1291 break;
1292
1293 default:
1294 return -EINVAL;
1295 }
1296
1297 switch (p->sel.family) {
1298 case AF_INET:
1299 break;
1300
1301 case AF_INET6:
1302 #if IS_ENABLED(CONFIG_IPV6)
1303 break;
1304 #else
1305 return -EAFNOSUPPORT;
1306 #endif
1307
1308 default:
1309 return -EINVAL;
1310 }
1311
1312 ret = verify_policy_dir(p->dir);
1313 if (ret)
1314 return ret;
1315 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1316 return -EINVAL;
1317
1318 return 0;
1319 }
1320
copy_from_user_sec_ctx(struct xfrm_policy * pol,struct nlattr ** attrs)1321 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1322 {
1323 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1324 struct xfrm_user_sec_ctx *uctx;
1325
1326 if (!rt)
1327 return 0;
1328
1329 uctx = nla_data(rt);
1330 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1331 }
1332
copy_templates(struct xfrm_policy * xp,struct xfrm_user_tmpl * ut,int nr)1333 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1334 int nr)
1335 {
1336 int i;
1337
1338 xp->xfrm_nr = nr;
1339 for (i = 0; i < nr; i++, ut++) {
1340 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1341
1342 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1343 memcpy(&t->saddr, &ut->saddr,
1344 sizeof(xfrm_address_t));
1345 t->reqid = ut->reqid;
1346 t->mode = ut->mode;
1347 t->share = ut->share;
1348 t->optional = ut->optional;
1349 t->aalgos = ut->aalgos;
1350 t->ealgos = ut->ealgos;
1351 t->calgos = ut->calgos;
1352 /* If all masks are ~0, then we allow all algorithms. */
1353 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1354 t->encap_family = ut->family;
1355 }
1356 }
1357
validate_tmpl(int nr,struct xfrm_user_tmpl * ut,u16 family)1358 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1359 {
1360 int i;
1361
1362 if (nr > XFRM_MAX_DEPTH)
1363 return -EINVAL;
1364
1365 for (i = 0; i < nr; i++) {
1366 /* We never validated the ut->family value, so many
1367 * applications simply leave it at zero. The check was
1368 * never made and ut->family was ignored because all
1369 * templates could be assumed to have the same family as
1370 * the policy itself. Now that we will have ipv4-in-ipv6
1371 * and ipv6-in-ipv4 tunnels, this is no longer true.
1372 */
1373 if (!ut[i].family)
1374 ut[i].family = family;
1375
1376 switch (ut[i].family) {
1377 case AF_INET:
1378 break;
1379 #if IS_ENABLED(CONFIG_IPV6)
1380 case AF_INET6:
1381 break;
1382 #endif
1383 default:
1384 return -EINVAL;
1385 }
1386 }
1387
1388 return 0;
1389 }
1390
copy_from_user_tmpl(struct xfrm_policy * pol,struct nlattr ** attrs)1391 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1392 {
1393 struct nlattr *rt = attrs[XFRMA_TMPL];
1394
1395 if (!rt) {
1396 pol->xfrm_nr = 0;
1397 } else {
1398 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1399 int nr = nla_len(rt) / sizeof(*utmpl);
1400 int err;
1401
1402 err = validate_tmpl(nr, utmpl, pol->family);
1403 if (err)
1404 return err;
1405
1406 copy_templates(pol, utmpl, nr);
1407 }
1408 return 0;
1409 }
1410
copy_from_user_policy_type(u8 * tp,struct nlattr ** attrs)1411 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1412 {
1413 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1414 struct xfrm_userpolicy_type *upt;
1415 u8 type = XFRM_POLICY_TYPE_MAIN;
1416 int err;
1417
1418 if (rt) {
1419 upt = nla_data(rt);
1420 type = upt->type;
1421 }
1422
1423 err = verify_policy_type(type);
1424 if (err)
1425 return err;
1426
1427 *tp = type;
1428 return 0;
1429 }
1430
copy_from_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p)1431 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1432 {
1433 xp->priority = p->priority;
1434 xp->index = p->index;
1435 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1436 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1437 xp->action = p->action;
1438 xp->flags = p->flags;
1439 xp->family = p->sel.family;
1440 /* XXX xp->share = p->share; */
1441 }
1442
copy_to_user_policy(struct xfrm_policy * xp,struct xfrm_userpolicy_info * p,int dir)1443 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1444 {
1445 memset(p, 0, sizeof(*p));
1446 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1447 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1448 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1449 p->priority = xp->priority;
1450 p->index = xp->index;
1451 p->sel.family = xp->family;
1452 p->dir = dir;
1453 p->action = xp->action;
1454 p->flags = xp->flags;
1455 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1456 }
1457
xfrm_policy_construct(struct net * net,struct xfrm_userpolicy_info * p,struct nlattr ** attrs,int * errp)1458 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1459 {
1460 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1461 int err;
1462
1463 if (!xp) {
1464 *errp = -ENOMEM;
1465 return NULL;
1466 }
1467
1468 copy_from_user_policy(xp, p);
1469
1470 err = copy_from_user_policy_type(&xp->type, attrs);
1471 if (err)
1472 goto error;
1473
1474 if (!(err = copy_from_user_tmpl(xp, attrs)))
1475 err = copy_from_user_sec_ctx(xp, attrs);
1476 if (err)
1477 goto error;
1478
1479 xfrm_mark_get(attrs, &xp->mark);
1480
1481 return xp;
1482 error:
1483 *errp = err;
1484 xp->walk.dead = 1;
1485 xfrm_policy_destroy(xp);
1486 return NULL;
1487 }
1488
xfrm_add_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1489 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1490 struct nlattr **attrs)
1491 {
1492 struct net *net = sock_net(skb->sk);
1493 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1494 struct xfrm_policy *xp;
1495 struct km_event c;
1496 int err;
1497 int excl;
1498
1499 err = verify_newpolicy_info(p);
1500 if (err)
1501 return err;
1502 err = verify_sec_ctx_len(attrs);
1503 if (err)
1504 return err;
1505
1506 xp = xfrm_policy_construct(net, p, attrs, &err);
1507 if (!xp)
1508 return err;
1509
1510 /* shouldn't excl be based on nlh flags??
1511 * Aha! this is anti-netlink really i.e more pfkey derived
1512 * in netlink excl is a flag and you wouldnt need
1513 * a type XFRM_MSG_UPDPOLICY - JHS */
1514 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1515 err = xfrm_policy_insert(p->dir, xp, excl);
1516 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1517
1518 if (err) {
1519 security_xfrm_policy_free(xp->security);
1520 kfree(xp);
1521 return err;
1522 }
1523
1524 c.event = nlh->nlmsg_type;
1525 c.seq = nlh->nlmsg_seq;
1526 c.portid = nlh->nlmsg_pid;
1527 km_policy_notify(xp, p->dir, &c);
1528
1529 xfrm_pol_put(xp);
1530
1531 return 0;
1532 }
1533
copy_to_user_tmpl(struct xfrm_policy * xp,struct sk_buff * skb)1534 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1535 {
1536 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1537 int i;
1538
1539 if (xp->xfrm_nr == 0)
1540 return 0;
1541
1542 for (i = 0; i < xp->xfrm_nr; i++) {
1543 struct xfrm_user_tmpl *up = &vec[i];
1544 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1545
1546 memset(up, 0, sizeof(*up));
1547 memcpy(&up->id, &kp->id, sizeof(up->id));
1548 up->family = kp->encap_family;
1549 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1550 up->reqid = kp->reqid;
1551 up->mode = kp->mode;
1552 up->share = kp->share;
1553 up->optional = kp->optional;
1554 up->aalgos = kp->aalgos;
1555 up->ealgos = kp->ealgos;
1556 up->calgos = kp->calgos;
1557 }
1558
1559 return nla_put(skb, XFRMA_TMPL,
1560 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1561 }
1562
copy_to_user_state_sec_ctx(struct xfrm_state * x,struct sk_buff * skb)1563 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1564 {
1565 if (x->security) {
1566 return copy_sec_ctx(x->security, skb);
1567 }
1568 return 0;
1569 }
1570
copy_to_user_sec_ctx(struct xfrm_policy * xp,struct sk_buff * skb)1571 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1572 {
1573 if (xp->security)
1574 return copy_sec_ctx(xp->security, skb);
1575 return 0;
1576 }
userpolicy_type_attrsize(void)1577 static inline size_t userpolicy_type_attrsize(void)
1578 {
1579 #ifdef CONFIG_XFRM_SUB_POLICY
1580 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1581 #else
1582 return 0;
1583 #endif
1584 }
1585
1586 #ifdef CONFIG_XFRM_SUB_POLICY
copy_to_user_policy_type(u8 type,struct sk_buff * skb)1587 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1588 {
1589 struct xfrm_userpolicy_type upt = {
1590 .type = type,
1591 };
1592
1593 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1594 }
1595
1596 #else
copy_to_user_policy_type(u8 type,struct sk_buff * skb)1597 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1598 {
1599 return 0;
1600 }
1601 #endif
1602
dump_one_policy(struct xfrm_policy * xp,int dir,int count,void * ptr)1603 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1604 {
1605 struct xfrm_dump_info *sp = ptr;
1606 struct xfrm_userpolicy_info *p;
1607 struct sk_buff *in_skb = sp->in_skb;
1608 struct sk_buff *skb = sp->out_skb;
1609 struct nlmsghdr *nlh;
1610 int err;
1611
1612 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1613 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1614 if (nlh == NULL)
1615 return -EMSGSIZE;
1616
1617 p = nlmsg_data(nlh);
1618 copy_to_user_policy(xp, p, dir);
1619 err = copy_to_user_tmpl(xp, skb);
1620 if (!err)
1621 err = copy_to_user_sec_ctx(xp, skb);
1622 if (!err)
1623 err = copy_to_user_policy_type(xp->type, skb);
1624 if (!err)
1625 err = xfrm_mark_put(skb, &xp->mark);
1626 if (err) {
1627 nlmsg_cancel(skb, nlh);
1628 return err;
1629 }
1630 nlmsg_end(skb, nlh);
1631 return 0;
1632 }
1633
xfrm_dump_policy_done(struct netlink_callback * cb)1634 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1635 {
1636 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1637 struct net *net = sock_net(cb->skb->sk);
1638
1639 xfrm_policy_walk_done(walk, net);
1640 return 0;
1641 }
1642
xfrm_dump_policy_start(struct netlink_callback * cb)1643 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1644 {
1645 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1646
1647 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1648
1649 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1650 return 0;
1651 }
1652
xfrm_dump_policy(struct sk_buff * skb,struct netlink_callback * cb)1653 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1654 {
1655 struct net *net = sock_net(skb->sk);
1656 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1657 struct xfrm_dump_info info;
1658
1659 info.in_skb = cb->skb;
1660 info.out_skb = skb;
1661 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1662 info.nlmsg_flags = NLM_F_MULTI;
1663
1664 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1665
1666 return skb->len;
1667 }
1668
xfrm_policy_netlink(struct sk_buff * in_skb,struct xfrm_policy * xp,int dir,u32 seq)1669 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1670 struct xfrm_policy *xp,
1671 int dir, u32 seq)
1672 {
1673 struct xfrm_dump_info info;
1674 struct sk_buff *skb;
1675 int err;
1676
1677 err = verify_policy_dir(dir);
1678 if (err)
1679 return ERR_PTR(err);
1680
1681 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1682 if (!skb)
1683 return ERR_PTR(-ENOMEM);
1684
1685 info.in_skb = in_skb;
1686 info.out_skb = skb;
1687 info.nlmsg_seq = seq;
1688 info.nlmsg_flags = 0;
1689
1690 err = dump_one_policy(xp, dir, 0, &info);
1691 if (err) {
1692 kfree_skb(skb);
1693 return ERR_PTR(err);
1694 }
1695
1696 return skb;
1697 }
1698
xfrm_get_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1699 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1700 struct nlattr **attrs)
1701 {
1702 struct net *net = sock_net(skb->sk);
1703 struct xfrm_policy *xp;
1704 struct xfrm_userpolicy_id *p;
1705 u8 type = XFRM_POLICY_TYPE_MAIN;
1706 int err;
1707 struct km_event c;
1708 int delete;
1709 struct xfrm_mark m;
1710 u32 mark = xfrm_mark_get(attrs, &m);
1711
1712 p = nlmsg_data(nlh);
1713 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1714
1715 err = copy_from_user_policy_type(&type, attrs);
1716 if (err)
1717 return err;
1718
1719 err = verify_policy_dir(p->dir);
1720 if (err)
1721 return err;
1722
1723 if (p->index)
1724 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1725 else {
1726 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1727 struct xfrm_sec_ctx *ctx;
1728
1729 err = verify_sec_ctx_len(attrs);
1730 if (err)
1731 return err;
1732
1733 ctx = NULL;
1734 if (rt) {
1735 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1736
1737 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1738 if (err)
1739 return err;
1740 }
1741 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1742 ctx, delete, &err);
1743 security_xfrm_policy_free(ctx);
1744 }
1745 if (xp == NULL)
1746 return -ENOENT;
1747
1748 if (!delete) {
1749 struct sk_buff *resp_skb;
1750
1751 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1752 if (IS_ERR(resp_skb)) {
1753 err = PTR_ERR(resp_skb);
1754 } else {
1755 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1756 NETLINK_CB(skb).portid);
1757 }
1758 } else {
1759 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1760
1761 if (err != 0)
1762 goto out;
1763
1764 c.data.byid = p->index;
1765 c.event = nlh->nlmsg_type;
1766 c.seq = nlh->nlmsg_seq;
1767 c.portid = nlh->nlmsg_pid;
1768 km_policy_notify(xp, p->dir, &c);
1769 }
1770
1771 out:
1772 xfrm_pol_put(xp);
1773 if (delete && err == 0)
1774 xfrm_garbage_collect(net);
1775 return err;
1776 }
1777
xfrm_flush_sa(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1778 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1779 struct nlattr **attrs)
1780 {
1781 struct net *net = sock_net(skb->sk);
1782 struct km_event c;
1783 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1784 int err;
1785
1786 err = xfrm_state_flush(net, p->proto, true);
1787 if (err) {
1788 if (err == -ESRCH) /* empty table */
1789 return 0;
1790 return err;
1791 }
1792 c.data.proto = p->proto;
1793 c.event = nlh->nlmsg_type;
1794 c.seq = nlh->nlmsg_seq;
1795 c.portid = nlh->nlmsg_pid;
1796 c.net = net;
1797 km_state_notify(NULL, &c);
1798
1799 return 0;
1800 }
1801
xfrm_aevent_msgsize(struct xfrm_state * x)1802 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1803 {
1804 size_t replay_size = x->replay_esn ?
1805 xfrm_replay_state_esn_len(x->replay_esn) :
1806 sizeof(struct xfrm_replay_state);
1807
1808 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1809 + nla_total_size(replay_size)
1810 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1811 + nla_total_size(sizeof(struct xfrm_mark))
1812 + nla_total_size(4) /* XFRM_AE_RTHR */
1813 + nla_total_size(4); /* XFRM_AE_ETHR */
1814 }
1815
build_aevent(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)1816 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1817 {
1818 struct xfrm_aevent_id *id;
1819 struct nlmsghdr *nlh;
1820 int err;
1821
1822 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1823 if (nlh == NULL)
1824 return -EMSGSIZE;
1825
1826 id = nlmsg_data(nlh);
1827 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1828 id->sa_id.spi = x->id.spi;
1829 id->sa_id.family = x->props.family;
1830 id->sa_id.proto = x->id.proto;
1831 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1832 id->reqid = x->props.reqid;
1833 id->flags = c->data.aevent;
1834
1835 if (x->replay_esn) {
1836 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1837 xfrm_replay_state_esn_len(x->replay_esn),
1838 x->replay_esn);
1839 } else {
1840 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1841 &x->replay);
1842 }
1843 if (err)
1844 goto out_cancel;
1845 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1846 if (err)
1847 goto out_cancel;
1848
1849 if (id->flags & XFRM_AE_RTHR) {
1850 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1851 if (err)
1852 goto out_cancel;
1853 }
1854 if (id->flags & XFRM_AE_ETHR) {
1855 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1856 x->replay_maxage * 10 / HZ);
1857 if (err)
1858 goto out_cancel;
1859 }
1860 err = xfrm_mark_put(skb, &x->mark);
1861 if (err)
1862 goto out_cancel;
1863
1864 return nlmsg_end(skb, nlh);
1865
1866 out_cancel:
1867 nlmsg_cancel(skb, nlh);
1868 return err;
1869 }
1870
xfrm_get_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1871 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1872 struct nlattr **attrs)
1873 {
1874 struct net *net = sock_net(skb->sk);
1875 struct xfrm_state *x;
1876 struct sk_buff *r_skb;
1877 int err;
1878 struct km_event c;
1879 u32 mark;
1880 struct xfrm_mark m;
1881 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1882 struct xfrm_usersa_id *id = &p->sa_id;
1883
1884 mark = xfrm_mark_get(attrs, &m);
1885
1886 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1887 if (x == NULL)
1888 return -ESRCH;
1889
1890 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1891 if (r_skb == NULL) {
1892 xfrm_state_put(x);
1893 return -ENOMEM;
1894 }
1895
1896 /*
1897 * XXX: is this lock really needed - none of the other
1898 * gets lock (the concern is things getting updated
1899 * while we are still reading) - jhs
1900 */
1901 spin_lock_bh(&x->lock);
1902 c.data.aevent = p->flags;
1903 c.seq = nlh->nlmsg_seq;
1904 c.portid = nlh->nlmsg_pid;
1905
1906 if (build_aevent(r_skb, x, &c) < 0)
1907 BUG();
1908 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1909 spin_unlock_bh(&x->lock);
1910 xfrm_state_put(x);
1911 return err;
1912 }
1913
xfrm_new_ae(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1914 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1915 struct nlattr **attrs)
1916 {
1917 struct net *net = sock_net(skb->sk);
1918 struct xfrm_state *x;
1919 struct km_event c;
1920 int err = -EINVAL;
1921 u32 mark = 0;
1922 struct xfrm_mark m;
1923 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1924 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1925 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1926 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1927
1928 if (!lt && !rp && !re)
1929 return err;
1930
1931 /* pedantic mode - thou shalt sayeth replaceth */
1932 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1933 return err;
1934
1935 mark = xfrm_mark_get(attrs, &m);
1936
1937 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1938 if (x == NULL)
1939 return -ESRCH;
1940
1941 if (x->km.state != XFRM_STATE_VALID)
1942 goto out;
1943
1944 err = xfrm_replay_verify_len(x->replay_esn, re);
1945 if (err)
1946 goto out;
1947
1948 spin_lock_bh(&x->lock);
1949 xfrm_update_ae_params(x, attrs, 1);
1950 spin_unlock_bh(&x->lock);
1951
1952 c.event = nlh->nlmsg_type;
1953 c.seq = nlh->nlmsg_seq;
1954 c.portid = nlh->nlmsg_pid;
1955 c.data.aevent = XFRM_AE_CU;
1956 km_state_notify(x, &c);
1957 err = 0;
1958 out:
1959 xfrm_state_put(x);
1960 return err;
1961 }
1962
xfrm_flush_policy(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1963 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1964 struct nlattr **attrs)
1965 {
1966 struct net *net = sock_net(skb->sk);
1967 struct km_event c;
1968 u8 type = XFRM_POLICY_TYPE_MAIN;
1969 int err;
1970
1971 err = copy_from_user_policy_type(&type, attrs);
1972 if (err)
1973 return err;
1974
1975 err = xfrm_policy_flush(net, type, true);
1976 if (err) {
1977 if (err == -ESRCH) /* empty table */
1978 return 0;
1979 return err;
1980 }
1981
1982 c.data.type = type;
1983 c.event = nlh->nlmsg_type;
1984 c.seq = nlh->nlmsg_seq;
1985 c.portid = nlh->nlmsg_pid;
1986 c.net = net;
1987 km_policy_notify(NULL, 0, &c);
1988 return 0;
1989 }
1990
xfrm_add_pol_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)1991 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1992 struct nlattr **attrs)
1993 {
1994 struct net *net = sock_net(skb->sk);
1995 struct xfrm_policy *xp;
1996 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1997 struct xfrm_userpolicy_info *p = &up->pol;
1998 u8 type = XFRM_POLICY_TYPE_MAIN;
1999 int err = -ENOENT;
2000 struct xfrm_mark m;
2001 u32 mark = xfrm_mark_get(attrs, &m);
2002
2003 err = copy_from_user_policy_type(&type, attrs);
2004 if (err)
2005 return err;
2006
2007 err = verify_policy_dir(p->dir);
2008 if (err)
2009 return err;
2010
2011 if (p->index)
2012 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2013 else {
2014 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2015 struct xfrm_sec_ctx *ctx;
2016
2017 err = verify_sec_ctx_len(attrs);
2018 if (err)
2019 return err;
2020
2021 ctx = NULL;
2022 if (rt) {
2023 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2024
2025 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2026 if (err)
2027 return err;
2028 }
2029 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2030 &p->sel, ctx, 0, &err);
2031 security_xfrm_policy_free(ctx);
2032 }
2033 if (xp == NULL)
2034 return -ENOENT;
2035
2036 if (unlikely(xp->walk.dead))
2037 goto out;
2038
2039 err = 0;
2040 if (up->hard) {
2041 xfrm_policy_delete(xp, p->dir);
2042 xfrm_audit_policy_delete(xp, 1, true);
2043 } else {
2044 // reset the timers here?
2045 WARN(1, "Dont know what to do with soft policy expire\n");
2046 }
2047 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2048
2049 out:
2050 xfrm_pol_put(xp);
2051 return err;
2052 }
2053
xfrm_add_sa_expire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2054 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2055 struct nlattr **attrs)
2056 {
2057 struct net *net = sock_net(skb->sk);
2058 struct xfrm_state *x;
2059 int err;
2060 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2061 struct xfrm_usersa_info *p = &ue->state;
2062 struct xfrm_mark m;
2063 u32 mark = xfrm_mark_get(attrs, &m);
2064
2065 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2066
2067 err = -ENOENT;
2068 if (x == NULL)
2069 return err;
2070
2071 spin_lock_bh(&x->lock);
2072 err = -EINVAL;
2073 if (x->km.state != XFRM_STATE_VALID)
2074 goto out;
2075 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2076
2077 if (ue->hard) {
2078 __xfrm_state_delete(x);
2079 xfrm_audit_state_delete(x, 1, true);
2080 }
2081 err = 0;
2082 out:
2083 spin_unlock_bh(&x->lock);
2084 xfrm_state_put(x);
2085 return err;
2086 }
2087
xfrm_add_acquire(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2088 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2089 struct nlattr **attrs)
2090 {
2091 struct net *net = sock_net(skb->sk);
2092 struct xfrm_policy *xp;
2093 struct xfrm_user_tmpl *ut;
2094 int i;
2095 struct nlattr *rt = attrs[XFRMA_TMPL];
2096 struct xfrm_mark mark;
2097
2098 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2099 struct xfrm_state *x = xfrm_state_alloc(net);
2100 int err = -ENOMEM;
2101
2102 if (!x)
2103 goto nomem;
2104
2105 xfrm_mark_get(attrs, &mark);
2106
2107 err = verify_newpolicy_info(&ua->policy);
2108 if (err)
2109 goto bad_policy;
2110
2111 /* build an XP */
2112 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2113 if (!xp)
2114 goto free_state;
2115
2116 memcpy(&x->id, &ua->id, sizeof(ua->id));
2117 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2118 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2119 xp->mark.m = x->mark.m = mark.m;
2120 xp->mark.v = x->mark.v = mark.v;
2121 ut = nla_data(rt);
2122 /* extract the templates and for each call km_key */
2123 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2124 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2125 memcpy(&x->id, &t->id, sizeof(x->id));
2126 x->props.mode = t->mode;
2127 x->props.reqid = t->reqid;
2128 x->props.family = ut->family;
2129 t->aalgos = ua->aalgos;
2130 t->ealgos = ua->ealgos;
2131 t->calgos = ua->calgos;
2132 err = km_query(x, t, xp);
2133
2134 }
2135
2136 kfree(x);
2137 kfree(xp);
2138
2139 return 0;
2140
2141 bad_policy:
2142 WARN(1, "BAD policy passed\n");
2143 free_state:
2144 kfree(x);
2145 nomem:
2146 return err;
2147 }
2148
2149 #ifdef CONFIG_XFRM_MIGRATE
copy_from_user_migrate(struct xfrm_migrate * ma,struct xfrm_kmaddress * k,struct nlattr ** attrs,int * num)2150 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2151 struct xfrm_kmaddress *k,
2152 struct nlattr **attrs, int *num)
2153 {
2154 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2155 struct xfrm_user_migrate *um;
2156 int i, num_migrate;
2157
2158 if (k != NULL) {
2159 struct xfrm_user_kmaddress *uk;
2160
2161 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2162 memcpy(&k->local, &uk->local, sizeof(k->local));
2163 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2164 k->family = uk->family;
2165 k->reserved = uk->reserved;
2166 }
2167
2168 um = nla_data(rt);
2169 num_migrate = nla_len(rt) / sizeof(*um);
2170
2171 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2172 return -EINVAL;
2173
2174 for (i = 0; i < num_migrate; i++, um++, ma++) {
2175 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2176 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2177 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2178 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2179
2180 ma->proto = um->proto;
2181 ma->mode = um->mode;
2182 ma->reqid = um->reqid;
2183
2184 ma->old_family = um->old_family;
2185 ma->new_family = um->new_family;
2186 }
2187
2188 *num = i;
2189 return 0;
2190 }
2191
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2192 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2193 struct nlattr **attrs)
2194 {
2195 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2196 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2197 struct xfrm_kmaddress km, *kmp;
2198 u8 type;
2199 int err;
2200 int n = 0;
2201 struct net *net = sock_net(skb->sk);
2202
2203 err = verify_policy_dir(pi->dir);
2204 if (err)
2205 return err;
2206
2207 if (attrs[XFRMA_MIGRATE] == NULL)
2208 return -EINVAL;
2209
2210 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2211
2212 err = copy_from_user_policy_type(&type, attrs);
2213 if (err)
2214 return err;
2215
2216 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2217 if (err)
2218 return err;
2219
2220 if (!n)
2221 return 0;
2222
2223 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2224
2225 return 0;
2226 }
2227 #else
xfrm_do_migrate(struct sk_buff * skb,struct nlmsghdr * nlh,struct nlattr ** attrs)2228 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2229 struct nlattr **attrs)
2230 {
2231 return -ENOPROTOOPT;
2232 }
2233 #endif
2234
2235 #ifdef CONFIG_XFRM_MIGRATE
copy_to_user_migrate(const struct xfrm_migrate * m,struct sk_buff * skb)2236 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2237 {
2238 struct xfrm_user_migrate um;
2239
2240 memset(&um, 0, sizeof(um));
2241 um.proto = m->proto;
2242 um.mode = m->mode;
2243 um.reqid = m->reqid;
2244 um.old_family = m->old_family;
2245 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2246 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2247 um.new_family = m->new_family;
2248 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2249 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2250
2251 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2252 }
2253
copy_to_user_kmaddress(const struct xfrm_kmaddress * k,struct sk_buff * skb)2254 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2255 {
2256 struct xfrm_user_kmaddress uk;
2257
2258 memset(&uk, 0, sizeof(uk));
2259 uk.family = k->family;
2260 uk.reserved = k->reserved;
2261 memcpy(&uk.local, &k->local, sizeof(uk.local));
2262 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2263
2264 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2265 }
2266
xfrm_migrate_msgsize(int num_migrate,int with_kma)2267 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2268 {
2269 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2270 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2271 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2272 + userpolicy_type_attrsize();
2273 }
2274
build_migrate(struct sk_buff * skb,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k,const struct xfrm_selector * sel,u8 dir,u8 type)2275 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2276 int num_migrate, const struct xfrm_kmaddress *k,
2277 const struct xfrm_selector *sel, u8 dir, u8 type)
2278 {
2279 const struct xfrm_migrate *mp;
2280 struct xfrm_userpolicy_id *pol_id;
2281 struct nlmsghdr *nlh;
2282 int i, err;
2283
2284 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2285 if (nlh == NULL)
2286 return -EMSGSIZE;
2287
2288 pol_id = nlmsg_data(nlh);
2289 /* copy data from selector, dir, and type to the pol_id */
2290 memset(pol_id, 0, sizeof(*pol_id));
2291 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2292 pol_id->dir = dir;
2293
2294 if (k != NULL) {
2295 err = copy_to_user_kmaddress(k, skb);
2296 if (err)
2297 goto out_cancel;
2298 }
2299 err = copy_to_user_policy_type(type, skb);
2300 if (err)
2301 goto out_cancel;
2302 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2303 err = copy_to_user_migrate(mp, skb);
2304 if (err)
2305 goto out_cancel;
2306 }
2307
2308 return nlmsg_end(skb, nlh);
2309
2310 out_cancel:
2311 nlmsg_cancel(skb, nlh);
2312 return err;
2313 }
2314
xfrm_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k)2315 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2316 const struct xfrm_migrate *m, int num_migrate,
2317 const struct xfrm_kmaddress *k)
2318 {
2319 struct net *net = &init_net;
2320 struct sk_buff *skb;
2321 int err;
2322
2323 err = verify_policy_dir(dir);
2324 if (err)
2325 return err;
2326
2327 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2328 if (skb == NULL)
2329 return -ENOMEM;
2330
2331 /* build migrate */
2332 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2333 BUG();
2334
2335 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2336 }
2337 #else
xfrm_send_migrate(const struct xfrm_selector * sel,u8 dir,u8 type,const struct xfrm_migrate * m,int num_migrate,const struct xfrm_kmaddress * k)2338 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2339 const struct xfrm_migrate *m, int num_migrate,
2340 const struct xfrm_kmaddress *k)
2341 {
2342 return -ENOPROTOOPT;
2343 }
2344 #endif
2345
2346 #define XMSGSIZE(type) sizeof(struct type)
2347
2348 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2349 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2350 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2351 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2352 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2353 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2354 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2355 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2356 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2357 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2358 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2359 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2360 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2361 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2362 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2363 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2364 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2365 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2366 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2367 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2368 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2369 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2370 };
2371
2372 #undef XMSGSIZE
2373
2374 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2375 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2376 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2377 [XFRMA_LASTUSED] = { .type = NLA_U64},
2378 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2379 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2380 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2381 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2382 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2383 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2384 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2385 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2386 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2387 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2388 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2389 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2390 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2391 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2392 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2393 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2394 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2395 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2396 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2397 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2398 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2399 [XFRMA_PROTO] = { .type = NLA_U8 },
2400 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2401 [XFRMA_OUTPUT_MARK] = { .len = NLA_U32 },
2402 };
2403
2404 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2405 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2406 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2407 };
2408
2409 static const struct xfrm_link {
2410 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2411 int (*start)(struct netlink_callback *);
2412 int (*dump)(struct sk_buff *, struct netlink_callback *);
2413 int (*done)(struct netlink_callback *);
2414 const struct nla_policy *nla_pol;
2415 int nla_max;
2416 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2417 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2418 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2419 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2420 .dump = xfrm_dump_sa,
2421 .done = xfrm_dump_sa_done },
2422 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2423 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2424 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2425 .start = xfrm_dump_policy_start,
2426 .dump = xfrm_dump_policy,
2427 .done = xfrm_dump_policy_done },
2428 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2429 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2430 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2431 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2432 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2433 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2434 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2435 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2436 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2437 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2438 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2439 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2440 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2441 .nla_pol = xfrma_spd_policy,
2442 .nla_max = XFRMA_SPD_MAX },
2443 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2444 };
2445
xfrm_user_rcv_msg(struct sk_buff * skb,struct nlmsghdr * nlh)2446 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2447 {
2448 struct net *net = sock_net(skb->sk);
2449 struct nlattr *attrs[XFRMA_MAX+1];
2450 const struct xfrm_link *link;
2451 int type, err;
2452
2453 type = nlh->nlmsg_type;
2454 if (type > XFRM_MSG_MAX)
2455 return -EINVAL;
2456
2457 type -= XFRM_MSG_BASE;
2458 link = &xfrm_dispatch[type];
2459
2460 /* All operations require privileges, even GET */
2461 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2462 return -EPERM;
2463
2464 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2465 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2466 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2467 if (link->dump == NULL)
2468 return -EINVAL;
2469
2470 {
2471 struct netlink_dump_control c = {
2472 .start = link->start,
2473 .dump = link->dump,
2474 .done = link->done,
2475 };
2476 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2477 }
2478 }
2479
2480 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2481 link->nla_max ? : XFRMA_MAX,
2482 link->nla_pol ? : xfrma_policy);
2483 if (err < 0)
2484 return err;
2485
2486 if (link->doit == NULL)
2487 return -EINVAL;
2488
2489 return link->doit(skb, nlh, attrs);
2490 }
2491
xfrm_netlink_rcv(struct sk_buff * skb)2492 static void xfrm_netlink_rcv(struct sk_buff *skb)
2493 {
2494 struct net *net = sock_net(skb->sk);
2495
2496 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2497 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2498 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2499 }
2500
xfrm_expire_msgsize(void)2501 static inline size_t xfrm_expire_msgsize(void)
2502 {
2503 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2504 + nla_total_size(sizeof(struct xfrm_mark));
2505 }
2506
build_expire(struct sk_buff * skb,struct xfrm_state * x,const struct km_event * c)2507 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2508 {
2509 struct xfrm_user_expire *ue;
2510 struct nlmsghdr *nlh;
2511 int err;
2512
2513 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2514 if (nlh == NULL)
2515 return -EMSGSIZE;
2516
2517 ue = nlmsg_data(nlh);
2518 copy_to_user_state(x, &ue->state);
2519 ue->hard = (c->data.hard != 0) ? 1 : 0;
2520
2521 err = xfrm_mark_put(skb, &x->mark);
2522 if (err)
2523 return err;
2524
2525 return nlmsg_end(skb, nlh);
2526 }
2527
xfrm_exp_state_notify(struct xfrm_state * x,const struct km_event * c)2528 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2529 {
2530 struct net *net = xs_net(x);
2531 struct sk_buff *skb;
2532
2533 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2534 if (skb == NULL)
2535 return -ENOMEM;
2536
2537 if (build_expire(skb, x, c) < 0) {
2538 kfree_skb(skb);
2539 return -EMSGSIZE;
2540 }
2541
2542 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2543 }
2544
xfrm_aevent_state_notify(struct xfrm_state * x,const struct km_event * c)2545 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2546 {
2547 struct net *net = xs_net(x);
2548 struct sk_buff *skb;
2549
2550 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2551 if (skb == NULL)
2552 return -ENOMEM;
2553
2554 if (build_aevent(skb, x, c) < 0)
2555 BUG();
2556
2557 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2558 }
2559
xfrm_notify_sa_flush(const struct km_event * c)2560 static int xfrm_notify_sa_flush(const struct km_event *c)
2561 {
2562 struct net *net = c->net;
2563 struct xfrm_usersa_flush *p;
2564 struct nlmsghdr *nlh;
2565 struct sk_buff *skb;
2566 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2567
2568 skb = nlmsg_new(len, GFP_ATOMIC);
2569 if (skb == NULL)
2570 return -ENOMEM;
2571
2572 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2573 if (nlh == NULL) {
2574 kfree_skb(skb);
2575 return -EMSGSIZE;
2576 }
2577
2578 p = nlmsg_data(nlh);
2579 p->proto = c->data.proto;
2580
2581 nlmsg_end(skb, nlh);
2582
2583 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2584 }
2585
xfrm_sa_len(struct xfrm_state * x)2586 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2587 {
2588 size_t l = 0;
2589 if (x->aead)
2590 l += nla_total_size(aead_len(x->aead));
2591 if (x->aalg) {
2592 l += nla_total_size(sizeof(struct xfrm_algo) +
2593 (x->aalg->alg_key_len + 7) / 8);
2594 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2595 }
2596 if (x->ealg)
2597 l += nla_total_size(xfrm_alg_len(x->ealg));
2598 if (x->calg)
2599 l += nla_total_size(sizeof(*x->calg));
2600 if (x->encap)
2601 l += nla_total_size(sizeof(*x->encap));
2602 if (x->tfcpad)
2603 l += nla_total_size(sizeof(x->tfcpad));
2604 if (x->replay_esn)
2605 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2606 if (x->security)
2607 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2608 x->security->ctx_len);
2609 if (x->coaddr)
2610 l += nla_total_size(sizeof(*x->coaddr));
2611 if (x->props.extra_flags)
2612 l += nla_total_size(sizeof(x->props.extra_flags));
2613 if (x->props.output_mark)
2614 l += nla_total_size(sizeof(x->props.output_mark));
2615
2616 /* Must count x->lastused as it may become non-zero behind our back. */
2617 l += nla_total_size(sizeof(u64));
2618
2619 return l;
2620 }
2621
xfrm_notify_sa(struct xfrm_state * x,const struct km_event * c)2622 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2623 {
2624 struct net *net = xs_net(x);
2625 struct xfrm_usersa_info *p;
2626 struct xfrm_usersa_id *id;
2627 struct nlmsghdr *nlh;
2628 struct sk_buff *skb;
2629 int len = xfrm_sa_len(x);
2630 int headlen, err;
2631
2632 headlen = sizeof(*p);
2633 if (c->event == XFRM_MSG_DELSA) {
2634 len += nla_total_size(headlen);
2635 headlen = sizeof(*id);
2636 len += nla_total_size(sizeof(struct xfrm_mark));
2637 }
2638 len += NLMSG_ALIGN(headlen);
2639
2640 skb = nlmsg_new(len, GFP_ATOMIC);
2641 if (skb == NULL)
2642 return -ENOMEM;
2643
2644 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2645 err = -EMSGSIZE;
2646 if (nlh == NULL)
2647 goto out_free_skb;
2648
2649 p = nlmsg_data(nlh);
2650 if (c->event == XFRM_MSG_DELSA) {
2651 struct nlattr *attr;
2652
2653 id = nlmsg_data(nlh);
2654 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2655 id->spi = x->id.spi;
2656 id->family = x->props.family;
2657 id->proto = x->id.proto;
2658
2659 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2660 err = -EMSGSIZE;
2661 if (attr == NULL)
2662 goto out_free_skb;
2663
2664 p = nla_data(attr);
2665 }
2666 err = copy_to_user_state_extra(x, p, skb);
2667 if (err)
2668 goto out_free_skb;
2669
2670 nlmsg_end(skb, nlh);
2671
2672 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2673
2674 out_free_skb:
2675 kfree_skb(skb);
2676 return err;
2677 }
2678
xfrm_send_state_notify(struct xfrm_state * x,const struct km_event * c)2679 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2680 {
2681
2682 switch (c->event) {
2683 case XFRM_MSG_EXPIRE:
2684 return xfrm_exp_state_notify(x, c);
2685 case XFRM_MSG_NEWAE:
2686 return xfrm_aevent_state_notify(x, c);
2687 case XFRM_MSG_DELSA:
2688 case XFRM_MSG_UPDSA:
2689 case XFRM_MSG_NEWSA:
2690 return xfrm_notify_sa(x, c);
2691 case XFRM_MSG_FLUSHSA:
2692 return xfrm_notify_sa_flush(c);
2693 default:
2694 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2695 c->event);
2696 break;
2697 }
2698
2699 return 0;
2700
2701 }
2702
xfrm_acquire_msgsize(struct xfrm_state * x,struct xfrm_policy * xp)2703 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2704 struct xfrm_policy *xp)
2705 {
2706 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2707 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2708 + nla_total_size(sizeof(struct xfrm_mark))
2709 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2710 + userpolicy_type_attrsize();
2711 }
2712
build_acquire(struct sk_buff * skb,struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)2713 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2714 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2715 {
2716 __u32 seq = xfrm_get_acqseq();
2717 struct xfrm_user_acquire *ua;
2718 struct nlmsghdr *nlh;
2719 int err;
2720
2721 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2722 if (nlh == NULL)
2723 return -EMSGSIZE;
2724
2725 ua = nlmsg_data(nlh);
2726 memcpy(&ua->id, &x->id, sizeof(ua->id));
2727 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2728 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2729 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2730 ua->aalgos = xt->aalgos;
2731 ua->ealgos = xt->ealgos;
2732 ua->calgos = xt->calgos;
2733 ua->seq = x->km.seq = seq;
2734
2735 err = copy_to_user_tmpl(xp, skb);
2736 if (!err)
2737 err = copy_to_user_state_sec_ctx(x, skb);
2738 if (!err)
2739 err = copy_to_user_policy_type(xp->type, skb);
2740 if (!err)
2741 err = xfrm_mark_put(skb, &xp->mark);
2742 if (err) {
2743 nlmsg_cancel(skb, nlh);
2744 return err;
2745 }
2746
2747 return nlmsg_end(skb, nlh);
2748 }
2749
xfrm_send_acquire(struct xfrm_state * x,struct xfrm_tmpl * xt,struct xfrm_policy * xp)2750 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2751 struct xfrm_policy *xp)
2752 {
2753 struct net *net = xs_net(x);
2754 struct sk_buff *skb;
2755
2756 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2757 if (skb == NULL)
2758 return -ENOMEM;
2759
2760 if (build_acquire(skb, x, xt, xp) < 0)
2761 BUG();
2762
2763 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2764 }
2765
2766 /* User gives us xfrm_user_policy_info followed by an array of 0
2767 * or more templates.
2768 */
xfrm_compile_policy(struct sock * sk,int opt,u8 * data,int len,int * dir)2769 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2770 u8 *data, int len, int *dir)
2771 {
2772 struct net *net = sock_net(sk);
2773 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2774 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2775 struct xfrm_policy *xp;
2776 int nr;
2777
2778 switch (sk->sk_family) {
2779 case AF_INET:
2780 if (opt != IP_XFRM_POLICY) {
2781 *dir = -EOPNOTSUPP;
2782 return NULL;
2783 }
2784 break;
2785 #if IS_ENABLED(CONFIG_IPV6)
2786 case AF_INET6:
2787 if (opt != IPV6_XFRM_POLICY) {
2788 *dir = -EOPNOTSUPP;
2789 return NULL;
2790 }
2791 break;
2792 #endif
2793 default:
2794 *dir = -EINVAL;
2795 return NULL;
2796 }
2797
2798 *dir = -EINVAL;
2799
2800 if (len < sizeof(*p) ||
2801 verify_newpolicy_info(p))
2802 return NULL;
2803
2804 nr = ((len - sizeof(*p)) / sizeof(*ut));
2805 if (validate_tmpl(nr, ut, p->sel.family))
2806 return NULL;
2807
2808 if (p->dir > XFRM_POLICY_OUT)
2809 return NULL;
2810
2811 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2812 if (xp == NULL) {
2813 *dir = -ENOBUFS;
2814 return NULL;
2815 }
2816
2817 copy_from_user_policy(xp, p);
2818 xp->type = XFRM_POLICY_TYPE_MAIN;
2819 copy_templates(xp, ut, nr);
2820
2821 *dir = p->dir;
2822
2823 return xp;
2824 }
2825
xfrm_polexpire_msgsize(struct xfrm_policy * xp)2826 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2827 {
2828 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2829 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2830 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2831 + nla_total_size(sizeof(struct xfrm_mark))
2832 + userpolicy_type_attrsize();
2833 }
2834
build_polexpire(struct sk_buff * skb,struct xfrm_policy * xp,int dir,const struct km_event * c)2835 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2836 int dir, const struct km_event *c)
2837 {
2838 struct xfrm_user_polexpire *upe;
2839 int hard = c->data.hard;
2840 struct nlmsghdr *nlh;
2841 int err;
2842
2843 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2844 if (nlh == NULL)
2845 return -EMSGSIZE;
2846
2847 upe = nlmsg_data(nlh);
2848 copy_to_user_policy(xp, &upe->pol, dir);
2849 err = copy_to_user_tmpl(xp, skb);
2850 if (!err)
2851 err = copy_to_user_sec_ctx(xp, skb);
2852 if (!err)
2853 err = copy_to_user_policy_type(xp->type, skb);
2854 if (!err)
2855 err = xfrm_mark_put(skb, &xp->mark);
2856 if (err) {
2857 nlmsg_cancel(skb, nlh);
2858 return err;
2859 }
2860 upe->hard = !!hard;
2861
2862 return nlmsg_end(skb, nlh);
2863 }
2864
xfrm_exp_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2865 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2866 {
2867 struct net *net = xp_net(xp);
2868 struct sk_buff *skb;
2869
2870 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2871 if (skb == NULL)
2872 return -ENOMEM;
2873
2874 if (build_polexpire(skb, xp, dir, c) < 0)
2875 BUG();
2876
2877 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2878 }
2879
xfrm_notify_policy(struct xfrm_policy * xp,int dir,const struct km_event * c)2880 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2881 {
2882 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2883 struct net *net = xp_net(xp);
2884 struct xfrm_userpolicy_info *p;
2885 struct xfrm_userpolicy_id *id;
2886 struct nlmsghdr *nlh;
2887 struct sk_buff *skb;
2888 int headlen, err;
2889
2890 headlen = sizeof(*p);
2891 if (c->event == XFRM_MSG_DELPOLICY) {
2892 len += nla_total_size(headlen);
2893 headlen = sizeof(*id);
2894 }
2895 len += userpolicy_type_attrsize();
2896 len += nla_total_size(sizeof(struct xfrm_mark));
2897 len += NLMSG_ALIGN(headlen);
2898
2899 skb = nlmsg_new(len, GFP_ATOMIC);
2900 if (skb == NULL)
2901 return -ENOMEM;
2902
2903 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2904 err = -EMSGSIZE;
2905 if (nlh == NULL)
2906 goto out_free_skb;
2907
2908 p = nlmsg_data(nlh);
2909 if (c->event == XFRM_MSG_DELPOLICY) {
2910 struct nlattr *attr;
2911
2912 id = nlmsg_data(nlh);
2913 memset(id, 0, sizeof(*id));
2914 id->dir = dir;
2915 if (c->data.byid)
2916 id->index = xp->index;
2917 else
2918 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2919
2920 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2921 err = -EMSGSIZE;
2922 if (attr == NULL)
2923 goto out_free_skb;
2924
2925 p = nla_data(attr);
2926 }
2927
2928 copy_to_user_policy(xp, p, dir);
2929 err = copy_to_user_tmpl(xp, skb);
2930 if (!err)
2931 err = copy_to_user_policy_type(xp->type, skb);
2932 if (!err)
2933 err = xfrm_mark_put(skb, &xp->mark);
2934 if (err)
2935 goto out_free_skb;
2936
2937 nlmsg_end(skb, nlh);
2938
2939 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2940
2941 out_free_skb:
2942 kfree_skb(skb);
2943 return err;
2944 }
2945
xfrm_notify_policy_flush(const struct km_event * c)2946 static int xfrm_notify_policy_flush(const struct km_event *c)
2947 {
2948 struct net *net = c->net;
2949 struct nlmsghdr *nlh;
2950 struct sk_buff *skb;
2951 int err;
2952
2953 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2954 if (skb == NULL)
2955 return -ENOMEM;
2956
2957 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2958 err = -EMSGSIZE;
2959 if (nlh == NULL)
2960 goto out_free_skb;
2961 err = copy_to_user_policy_type(c->data.type, skb);
2962 if (err)
2963 goto out_free_skb;
2964
2965 nlmsg_end(skb, nlh);
2966
2967 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2968
2969 out_free_skb:
2970 kfree_skb(skb);
2971 return err;
2972 }
2973
xfrm_send_policy_notify(struct xfrm_policy * xp,int dir,const struct km_event * c)2974 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2975 {
2976 int err;
2977
2978 err = verify_policy_dir(dir);
2979 if (err)
2980 return err;
2981
2982 switch (c->event) {
2983 case XFRM_MSG_NEWPOLICY:
2984 case XFRM_MSG_UPDPOLICY:
2985 case XFRM_MSG_DELPOLICY:
2986 return xfrm_notify_policy(xp, dir, c);
2987 case XFRM_MSG_FLUSHPOLICY:
2988 return xfrm_notify_policy_flush(c);
2989 case XFRM_MSG_POLEXPIRE:
2990 return xfrm_exp_policy_notify(xp, dir, c);
2991 default:
2992 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2993 c->event);
2994 }
2995
2996 return 0;
2997
2998 }
2999
xfrm_report_msgsize(void)3000 static inline size_t xfrm_report_msgsize(void)
3001 {
3002 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3003 }
3004
build_report(struct sk_buff * skb,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3005 static int build_report(struct sk_buff *skb, u8 proto,
3006 struct xfrm_selector *sel, xfrm_address_t *addr)
3007 {
3008 struct xfrm_user_report *ur;
3009 struct nlmsghdr *nlh;
3010
3011 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3012 if (nlh == NULL)
3013 return -EMSGSIZE;
3014
3015 ur = nlmsg_data(nlh);
3016 ur->proto = proto;
3017 memcpy(&ur->sel, sel, sizeof(ur->sel));
3018
3019 if (addr) {
3020 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3021 if (err) {
3022 nlmsg_cancel(skb, nlh);
3023 return err;
3024 }
3025 }
3026 return nlmsg_end(skb, nlh);
3027 }
3028
xfrm_send_report(struct net * net,u8 proto,struct xfrm_selector * sel,xfrm_address_t * addr)3029 static int xfrm_send_report(struct net *net, u8 proto,
3030 struct xfrm_selector *sel, xfrm_address_t *addr)
3031 {
3032 struct sk_buff *skb;
3033
3034 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3035 if (skb == NULL)
3036 return -ENOMEM;
3037
3038 if (build_report(skb, proto, sel, addr) < 0)
3039 BUG();
3040
3041 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3042 }
3043
xfrm_mapping_msgsize(void)3044 static inline size_t xfrm_mapping_msgsize(void)
3045 {
3046 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3047 }
3048
build_mapping(struct sk_buff * skb,struct xfrm_state * x,xfrm_address_t * new_saddr,__be16 new_sport)3049 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3050 xfrm_address_t *new_saddr, __be16 new_sport)
3051 {
3052 struct xfrm_user_mapping *um;
3053 struct nlmsghdr *nlh;
3054
3055 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3056 if (nlh == NULL)
3057 return -EMSGSIZE;
3058
3059 um = nlmsg_data(nlh);
3060
3061 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3062 um->id.spi = x->id.spi;
3063 um->id.family = x->props.family;
3064 um->id.proto = x->id.proto;
3065 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3066 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3067 um->new_sport = new_sport;
3068 um->old_sport = x->encap->encap_sport;
3069 um->reqid = x->props.reqid;
3070
3071 return nlmsg_end(skb, nlh);
3072 }
3073
xfrm_send_mapping(struct xfrm_state * x,xfrm_address_t * ipaddr,__be16 sport)3074 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3075 __be16 sport)
3076 {
3077 struct net *net = xs_net(x);
3078 struct sk_buff *skb;
3079
3080 if (x->id.proto != IPPROTO_ESP)
3081 return -EINVAL;
3082
3083 if (!x->encap)
3084 return -EINVAL;
3085
3086 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3087 if (skb == NULL)
3088 return -ENOMEM;
3089
3090 if (build_mapping(skb, x, ipaddr, sport) < 0)
3091 BUG();
3092
3093 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3094 }
3095
xfrm_is_alive(const struct km_event * c)3096 static bool xfrm_is_alive(const struct km_event *c)
3097 {
3098 return (bool)xfrm_acquire_is_on(c->net);
3099 }
3100
3101 static struct xfrm_mgr netlink_mgr = {
3102 .id = "netlink",
3103 .notify = xfrm_send_state_notify,
3104 .acquire = xfrm_send_acquire,
3105 .compile_policy = xfrm_compile_policy,
3106 .notify_policy = xfrm_send_policy_notify,
3107 .report = xfrm_send_report,
3108 .migrate = xfrm_send_migrate,
3109 .new_mapping = xfrm_send_mapping,
3110 .is_alive = xfrm_is_alive,
3111 };
3112
xfrm_user_net_init(struct net * net)3113 static int __net_init xfrm_user_net_init(struct net *net)
3114 {
3115 struct sock *nlsk;
3116 struct netlink_kernel_cfg cfg = {
3117 .groups = XFRMNLGRP_MAX,
3118 .input = xfrm_netlink_rcv,
3119 };
3120
3121 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3122 if (nlsk == NULL)
3123 return -ENOMEM;
3124 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3125 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3126 return 0;
3127 }
3128
xfrm_user_net_exit(struct list_head * net_exit_list)3129 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3130 {
3131 struct net *net;
3132 list_for_each_entry(net, net_exit_list, exit_list)
3133 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3134 synchronize_net();
3135 list_for_each_entry(net, net_exit_list, exit_list)
3136 netlink_kernel_release(net->xfrm.nlsk_stash);
3137 }
3138
3139 static struct pernet_operations xfrm_user_net_ops = {
3140 .init = xfrm_user_net_init,
3141 .exit_batch = xfrm_user_net_exit,
3142 };
3143
xfrm_user_init(void)3144 static int __init xfrm_user_init(void)
3145 {
3146 int rv;
3147
3148 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3149
3150 rv = register_pernet_subsys(&xfrm_user_net_ops);
3151 if (rv < 0)
3152 return rv;
3153 rv = xfrm_register_km(&netlink_mgr);
3154 if (rv < 0)
3155 unregister_pernet_subsys(&xfrm_user_net_ops);
3156 return rv;
3157 }
3158
xfrm_user_exit(void)3159 static void __exit xfrm_user_exit(void)
3160 {
3161 xfrm_unregister_km(&netlink_mgr);
3162 unregister_pernet_subsys(&xfrm_user_net_ops);
3163 }
3164
3165 module_init(xfrm_user_init);
3166 module_exit(xfrm_user_exit);
3167 MODULE_LICENSE("GPL");
3168 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3169
3170