Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/net/xfrm/xfrm_user.c

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

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