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