Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17 3.18 3.19

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

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