Version:  2.0.40 2.2.26 2.4.37 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 3.15

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

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