Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

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

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