Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

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 #include <asm/unaligned.h>
 35 
 36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
 37 {
 38         struct nlattr *rt = attrs[type];
 39         struct xfrm_algo *algp;
 40 
 41         if (!rt)
 42                 return 0;
 43 
 44         algp = nla_data(rt);
 45         if (nla_len(rt) < xfrm_alg_len(algp))
 46                 return -EINVAL;
 47 
 48         switch (type) {
 49         case XFRMA_ALG_AUTH:
 50         case XFRMA_ALG_CRYPT:
 51         case XFRMA_ALG_COMP:
 52                 break;
 53 
 54         default:
 55                 return -EINVAL;
 56         }
 57 
 58         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 59         return 0;
 60 }
 61 
 62 static int verify_auth_trunc(struct nlattr **attrs)
 63 {
 64         struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
 65         struct xfrm_algo_auth *algp;
 66 
 67         if (!rt)
 68                 return 0;
 69 
 70         algp = nla_data(rt);
 71         if (nla_len(rt) < xfrm_alg_auth_len(algp))
 72                 return -EINVAL;
 73 
 74         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 75         return 0;
 76 }
 77 
 78 static int verify_aead(struct nlattr **attrs)
 79 {
 80         struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
 81         struct xfrm_algo_aead *algp;
 82 
 83         if (!rt)
 84                 return 0;
 85 
 86         algp = nla_data(rt);
 87         if (nla_len(rt) < aead_len(algp))
 88                 return -EINVAL;
 89 
 90         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 91         return 0;
 92 }
 93 
 94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
 95                            xfrm_address_t **addrp)
 96 {
 97         struct nlattr *rt = attrs[type];
 98 
 99         if (rt && addrp)
100                 *addrp = nla_data(rt);
101 }
102 
103 static inline int verify_sec_ctx_len(struct nlattr **attrs)
104 {
105         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
106         struct xfrm_user_sec_ctx *uctx;
107 
108         if (!rt)
109                 return 0;
110 
111         uctx = nla_data(rt);
112         if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
113                 return -EINVAL;
114 
115         return 0;
116 }
117 
118 static inline int verify_replay(struct xfrm_usersa_info *p,
119                                 struct nlattr **attrs)
120 {
121         struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
122         struct xfrm_replay_state_esn *rs;
123 
124         if (p->flags & XFRM_STATE_ESN) {
125                 if (!rt)
126                         return -EINVAL;
127 
128                 rs = nla_data(rt);
129 
130                 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
131                         return -EINVAL;
132 
133                 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
134                     nla_len(rt) != sizeof(*rs))
135                         return -EINVAL;
136         }
137 
138         if (!rt)
139                 return 0;
140 
141         /* As only ESP and AH support ESN feature. */
142         if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
143                 return -EINVAL;
144 
145         if (p->replay_window != 0)
146                 return -EINVAL;
147 
148         return 0;
149 }
150 
151 static int verify_newsa_info(struct xfrm_usersa_info *p,
152                              struct nlattr **attrs)
153 {
154         int err;
155 
156         err = -EINVAL;
157         switch (p->family) {
158         case AF_INET:
159                 break;
160 
161         case AF_INET6:
162 #if IS_ENABLED(CONFIG_IPV6)
163                 break;
164 #else
165                 err = -EAFNOSUPPORT;
166                 goto out;
167 #endif
168 
169         default:
170                 goto out;
171         }
172 
173         err = -EINVAL;
174         switch (p->id.proto) {
175         case IPPROTO_AH:
176                 if ((!attrs[XFRMA_ALG_AUTH]     &&
177                      !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
178                     attrs[XFRMA_ALG_AEAD]       ||
179                     attrs[XFRMA_ALG_CRYPT]      ||
180                     attrs[XFRMA_ALG_COMP]       ||
181                     attrs[XFRMA_TFCPAD])
182                         goto out;
183                 break;
184 
185         case IPPROTO_ESP:
186                 if (attrs[XFRMA_ALG_COMP])
187                         goto out;
188                 if (!attrs[XFRMA_ALG_AUTH] &&
189                     !attrs[XFRMA_ALG_AUTH_TRUNC] &&
190                     !attrs[XFRMA_ALG_CRYPT] &&
191                     !attrs[XFRMA_ALG_AEAD])
192                         goto out;
193                 if ((attrs[XFRMA_ALG_AUTH] ||
194                      attrs[XFRMA_ALG_AUTH_TRUNC] ||
195                      attrs[XFRMA_ALG_CRYPT]) &&
196                     attrs[XFRMA_ALG_AEAD])
197                         goto out;
198                 if (attrs[XFRMA_TFCPAD] &&
199                     p->mode != XFRM_MODE_TUNNEL)
200                         goto out;
201                 break;
202 
203         case IPPROTO_COMP:
204                 if (!attrs[XFRMA_ALG_COMP]      ||
205                     attrs[XFRMA_ALG_AEAD]       ||
206                     attrs[XFRMA_ALG_AUTH]       ||
207                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
208                     attrs[XFRMA_ALG_CRYPT]      ||
209                     attrs[XFRMA_TFCPAD]         ||
210                     (ntohl(p->id.spi) >= 0x10000))
211                         goto out;
212                 break;
213 
214 #if IS_ENABLED(CONFIG_IPV6)
215         case IPPROTO_DSTOPTS:
216         case IPPROTO_ROUTING:
217                 if (attrs[XFRMA_ALG_COMP]       ||
218                     attrs[XFRMA_ALG_AUTH]       ||
219                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
220                     attrs[XFRMA_ALG_AEAD]       ||
221                     attrs[XFRMA_ALG_CRYPT]      ||
222                     attrs[XFRMA_ENCAP]          ||
223                     attrs[XFRMA_SEC_CTX]        ||
224                     attrs[XFRMA_TFCPAD]         ||
225                     !attrs[XFRMA_COADDR])
226                         goto out;
227                 break;
228 #endif
229 
230         default:
231                 goto out;
232         }
233 
234         if ((err = verify_aead(attrs)))
235                 goto out;
236         if ((err = verify_auth_trunc(attrs)))
237                 goto out;
238         if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
239                 goto out;
240         if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
241                 goto out;
242         if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
243                 goto out;
244         if ((err = verify_sec_ctx_len(attrs)))
245                 goto out;
246         if ((err = verify_replay(p, attrs)))
247                 goto out;
248 
249         err = -EINVAL;
250         switch (p->mode) {
251         case XFRM_MODE_TRANSPORT:
252         case XFRM_MODE_TUNNEL:
253         case XFRM_MODE_ROUTEOPTIMIZATION:
254         case XFRM_MODE_BEET:
255                 break;
256 
257         default:
258                 goto out;
259         }
260 
261         err = 0;
262 
263 out:
264         return err;
265 }
266 
267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
268                            struct xfrm_algo_desc *(*get_byname)(const char *, int),
269                            struct nlattr *rta)
270 {
271         struct xfrm_algo *p, *ualg;
272         struct xfrm_algo_desc *algo;
273 
274         if (!rta)
275                 return 0;
276 
277         ualg = nla_data(rta);
278 
279         algo = get_byname(ualg->alg_name, 1);
280         if (!algo)
281                 return -ENOSYS;
282         *props = algo->desc.sadb_alg_id;
283 
284         p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
285         if (!p)
286                 return -ENOMEM;
287 
288         strcpy(p->alg_name, algo->name);
289         *algpp = p;
290         return 0;
291 }
292 
293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
294 {
295         struct xfrm_algo *p, *ualg;
296         struct xfrm_algo_desc *algo;
297 
298         if (!rta)
299                 return 0;
300 
301         ualg = nla_data(rta);
302 
303         algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
304         if (!algo)
305                 return -ENOSYS;
306         x->props.ealgo = algo->desc.sadb_alg_id;
307 
308         p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
309         if (!p)
310                 return -ENOMEM;
311 
312         strcpy(p->alg_name, algo->name);
313         x->ealg = p;
314         x->geniv = algo->uinfo.encr.geniv;
315         return 0;
316 }
317 
318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
319                        struct nlattr *rta)
320 {
321         struct xfrm_algo *ualg;
322         struct xfrm_algo_auth *p;
323         struct xfrm_algo_desc *algo;
324 
325         if (!rta)
326                 return 0;
327 
328         ualg = nla_data(rta);
329 
330         algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
331         if (!algo)
332                 return -ENOSYS;
333         *props = algo->desc.sadb_alg_id;
334 
335         p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
336         if (!p)
337                 return -ENOMEM;
338 
339         strcpy(p->alg_name, algo->name);
340         p->alg_key_len = ualg->alg_key_len;
341         p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
342         memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
343 
344         *algpp = p;
345         return 0;
346 }
347 
348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
349                              struct nlattr *rta)
350 {
351         struct xfrm_algo_auth *p, *ualg;
352         struct xfrm_algo_desc *algo;
353 
354         if (!rta)
355                 return 0;
356 
357         ualg = nla_data(rta);
358 
359         algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
360         if (!algo)
361                 return -ENOSYS;
362         if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
363                 return -EINVAL;
364         *props = algo->desc.sadb_alg_id;
365 
366         p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
367         if (!p)
368                 return -ENOMEM;
369 
370         strcpy(p->alg_name, algo->name);
371         if (!p->alg_trunc_len)
372                 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
373 
374         *algpp = p;
375         return 0;
376 }
377 
378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
379 {
380         struct xfrm_algo_aead *p, *ualg;
381         struct xfrm_algo_desc *algo;
382 
383         if (!rta)
384                 return 0;
385 
386         ualg = nla_data(rta);
387 
388         algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
389         if (!algo)
390                 return -ENOSYS;
391         x->props.ealgo = algo->desc.sadb_alg_id;
392 
393         p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
394         if (!p)
395                 return -ENOMEM;
396 
397         strcpy(p->alg_name, algo->name);
398         x->aead = p;
399         x->geniv = algo->uinfo.aead.geniv;
400         return 0;
401 }
402 
403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
404                                          struct nlattr *rp)
405 {
406         struct xfrm_replay_state_esn *up;
407         int ulen;
408 
409         if (!replay_esn || !rp)
410                 return 0;
411 
412         up = nla_data(rp);
413         ulen = xfrm_replay_state_esn_len(up);
414 
415         if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
416                 return -EINVAL;
417 
418         return 0;
419 }
420 
421 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
422                                        struct xfrm_replay_state_esn **preplay_esn,
423                                        struct nlattr *rta)
424 {
425         struct xfrm_replay_state_esn *p, *pp, *up;
426         int klen, ulen;
427 
428         if (!rta)
429                 return 0;
430 
431         up = nla_data(rta);
432         klen = xfrm_replay_state_esn_len(up);
433         ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
434 
435         p = kzalloc(klen, GFP_KERNEL);
436         if (!p)
437                 return -ENOMEM;
438 
439         pp = kzalloc(klen, GFP_KERNEL);
440         if (!pp) {
441                 kfree(p);
442                 return -ENOMEM;
443         }
444 
445         memcpy(p, up, ulen);
446         memcpy(pp, up, ulen);
447 
448         *replay_esn = p;
449         *preplay_esn = pp;
450 
451         return 0;
452 }
453 
454 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
455 {
456         int len = 0;
457 
458         if (xfrm_ctx) {
459                 len += sizeof(struct xfrm_user_sec_ctx);
460                 len += xfrm_ctx->ctx_len;
461         }
462         return len;
463 }
464 
465 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
466 {
467         memcpy(&x->id, &p->id, sizeof(x->id));
468         memcpy(&x->sel, &p->sel, sizeof(x->sel));
469         memcpy(&x->lft, &p->lft, sizeof(x->lft));
470         x->props.mode = p->mode;
471         x->props.replay_window = min_t(unsigned int, p->replay_window,
472                                         sizeof(x->replay.bitmap) * 8);
473         x->props.reqid = p->reqid;
474         x->props.family = p->family;
475         memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
476         x->props.flags = p->flags;
477 
478         if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
479                 x->sel.family = p->family;
480 }
481 
482 /*
483  * someday when pfkey also has support, we could have the code
484  * somehow made shareable and move it to xfrm_state.c - JHS
485  *
486 */
487 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
488                                   int update_esn)
489 {
490         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
491         struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
492         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
493         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
494         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
495 
496         if (re) {
497                 struct xfrm_replay_state_esn *replay_esn;
498                 replay_esn = nla_data(re);
499                 memcpy(x->replay_esn, replay_esn,
500                        xfrm_replay_state_esn_len(replay_esn));
501                 memcpy(x->preplay_esn, replay_esn,
502                        xfrm_replay_state_esn_len(replay_esn));
503         }
504 
505         if (rp) {
506                 struct xfrm_replay_state *replay;
507                 replay = nla_data(rp);
508                 memcpy(&x->replay, replay, sizeof(*replay));
509                 memcpy(&x->preplay, replay, sizeof(*replay));
510         }
511 
512         if (lt) {
513                 struct xfrm_lifetime_cur *ltime;
514                 ltime = nla_data(lt);
515                 x->curlft.bytes = ltime->bytes;
516                 x->curlft.packets = ltime->packets;
517                 x->curlft.add_time = ltime->add_time;
518                 x->curlft.use_time = ltime->use_time;
519         }
520 
521         if (et)
522                 x->replay_maxage = nla_get_u32(et);
523 
524         if (rt)
525                 x->replay_maxdiff = nla_get_u32(rt);
526 }
527 
528 static struct xfrm_state *xfrm_state_construct(struct net *net,
529                                                struct xfrm_usersa_info *p,
530                                                struct nlattr **attrs,
531                                                int *errp)
532 {
533         struct xfrm_state *x = xfrm_state_alloc(net);
534         int err = -ENOMEM;
535 
536         if (!x)
537                 goto error_no_put;
538 
539         copy_from_user_state(x, p);
540 
541         if (attrs[XFRMA_SA_EXTRA_FLAGS])
542                 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
543 
544         if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
545                 goto error;
546         if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
547                                      attrs[XFRMA_ALG_AUTH_TRUNC])))
548                 goto error;
549         if (!x->props.aalgo) {
550                 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
551                                        attrs[XFRMA_ALG_AUTH])))
552                         goto error;
553         }
554         if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
555                 goto error;
556         if ((err = attach_one_algo(&x->calg, &x->props.calgo,
557                                    xfrm_calg_get_byname,
558                                    attrs[XFRMA_ALG_COMP])))
559                 goto error;
560 
561         if (attrs[XFRMA_ENCAP]) {
562                 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
563                                    sizeof(*x->encap), GFP_KERNEL);
564                 if (x->encap == NULL)
565                         goto error;
566         }
567 
568         if (attrs[XFRMA_TFCPAD])
569                 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
570 
571         if (attrs[XFRMA_COADDR]) {
572                 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
573                                     sizeof(*x->coaddr), GFP_KERNEL);
574                 if (x->coaddr == NULL)
575                         goto error;
576         }
577 
578         xfrm_mark_get(attrs, &x->mark);
579 
580         err = __xfrm_init_state(x, false);
581         if (err)
582                 goto error;
583 
584         if (attrs[XFRMA_SEC_CTX] &&
585             security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
586                 goto error;
587 
588         if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
589                                                attrs[XFRMA_REPLAY_ESN_VAL])))
590                 goto error;
591 
592         x->km.seq = p->seq;
593         x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
594         /* sysctl_xfrm_aevent_etime is in 100ms units */
595         x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
596 
597         if ((err = xfrm_init_replay(x)))
598                 goto error;
599 
600         /* override default values from above */
601         xfrm_update_ae_params(x, attrs, 0);
602 
603         return x;
604 
605 error:
606         x->km.state = XFRM_STATE_DEAD;
607         xfrm_state_put(x);
608 error_no_put:
609         *errp = err;
610         return NULL;
611 }
612 
613 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
614                 struct nlattr **attrs)
615 {
616         struct net *net = sock_net(skb->sk);
617         struct xfrm_usersa_info *p = nlmsg_data(nlh);
618         struct xfrm_state *x;
619         int err;
620         struct km_event c;
621 
622         err = verify_newsa_info(p, attrs);
623         if (err)
624                 return err;
625 
626         x = xfrm_state_construct(net, p, attrs, &err);
627         if (!x)
628                 return err;
629 
630         xfrm_state_hold(x);
631         if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
632                 err = xfrm_state_add(x);
633         else
634                 err = xfrm_state_update(x);
635 
636         xfrm_audit_state_add(x, err ? 0 : 1, true);
637 
638         if (err < 0) {
639                 x->km.state = XFRM_STATE_DEAD;
640                 __xfrm_state_put(x);
641                 goto out;
642         }
643 
644         c.seq = nlh->nlmsg_seq;
645         c.portid = nlh->nlmsg_pid;
646         c.event = nlh->nlmsg_type;
647 
648         km_state_notify(x, &c);
649 out:
650         xfrm_state_put(x);
651         return err;
652 }
653 
654 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
655                                                  struct xfrm_usersa_id *p,
656                                                  struct nlattr **attrs,
657                                                  int *errp)
658 {
659         struct xfrm_state *x = NULL;
660         struct xfrm_mark m;
661         int err;
662         u32 mark = xfrm_mark_get(attrs, &m);
663 
664         if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
665                 err = -ESRCH;
666                 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
667         } else {
668                 xfrm_address_t *saddr = NULL;
669 
670                 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
671                 if (!saddr) {
672                         err = -EINVAL;
673                         goto out;
674                 }
675 
676                 err = -ESRCH;
677                 x = xfrm_state_lookup_byaddr(net, mark,
678                                              &p->daddr, saddr,
679                                              p->proto, p->family);
680         }
681 
682  out:
683         if (!x && errp)
684                 *errp = err;
685         return x;
686 }
687 
688 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
689                 struct nlattr **attrs)
690 {
691         struct net *net = sock_net(skb->sk);
692         struct xfrm_state *x;
693         int err = -ESRCH;
694         struct km_event c;
695         struct xfrm_usersa_id *p = nlmsg_data(nlh);
696 
697         x = xfrm_user_state_lookup(net, p, attrs, &err);
698         if (x == NULL)
699                 return err;
700 
701         if ((err = security_xfrm_state_delete(x)) != 0)
702                 goto out;
703 
704         if (xfrm_state_kern(x)) {
705                 err = -EPERM;
706                 goto out;
707         }
708 
709         err = xfrm_state_delete(x);
710 
711         if (err < 0)
712                 goto out;
713 
714         c.seq = nlh->nlmsg_seq;
715         c.portid = nlh->nlmsg_pid;
716         c.event = nlh->nlmsg_type;
717         km_state_notify(x, &c);
718 
719 out:
720         xfrm_audit_state_delete(x, err ? 0 : 1, true);
721         xfrm_state_put(x);
722         return err;
723 }
724 
725 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
726 {
727         memset(p, 0, sizeof(*p));
728         memcpy(&p->id, &x->id, sizeof(p->id));
729         memcpy(&p->sel, &x->sel, sizeof(p->sel));
730         memcpy(&p->lft, &x->lft, sizeof(p->lft));
731         memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
732         put_unaligned(x->stats.replay_window, &p->stats.replay_window);
733         put_unaligned(x->stats.replay, &p->stats.replay);
734         put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
735         memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
736         p->mode = x->props.mode;
737         p->replay_window = x->props.replay_window;
738         p->reqid = x->props.reqid;
739         p->family = x->props.family;
740         p->flags = x->props.flags;
741         p->seq = x->km.seq;
742 }
743 
744 struct xfrm_dump_info {
745         struct sk_buff *in_skb;
746         struct sk_buff *out_skb;
747         u32 nlmsg_seq;
748         u16 nlmsg_flags;
749 };
750 
751 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
752 {
753         struct xfrm_user_sec_ctx *uctx;
754         struct nlattr *attr;
755         int ctx_size = sizeof(*uctx) + s->ctx_len;
756 
757         attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
758         if (attr == NULL)
759                 return -EMSGSIZE;
760 
761         uctx = nla_data(attr);
762         uctx->exttype = XFRMA_SEC_CTX;
763         uctx->len = ctx_size;
764         uctx->ctx_doi = s->ctx_doi;
765         uctx->ctx_alg = s->ctx_alg;
766         uctx->ctx_len = s->ctx_len;
767         memcpy(uctx + 1, s->ctx_str, s->ctx_len);
768 
769         return 0;
770 }
771 
772 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
773 {
774         struct xfrm_algo *algo;
775         struct nlattr *nla;
776 
777         nla = nla_reserve(skb, XFRMA_ALG_AUTH,
778                           sizeof(*algo) + (auth->alg_key_len + 7) / 8);
779         if (!nla)
780                 return -EMSGSIZE;
781 
782         algo = nla_data(nla);
783         strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
784         memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
785         algo->alg_key_len = auth->alg_key_len;
786 
787         return 0;
788 }
789 
790 /* Don't change this without updating xfrm_sa_len! */
791 static int copy_to_user_state_extra(struct xfrm_state *x,
792                                     struct xfrm_usersa_info *p,
793                                     struct sk_buff *skb)
794 {
795         int ret = 0;
796 
797         copy_to_user_state(x, p);
798 
799         if (x->props.extra_flags) {
800                 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
801                                   x->props.extra_flags);
802                 if (ret)
803                         goto out;
804         }
805 
806         if (x->coaddr) {
807                 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
808                 if (ret)
809                         goto out;
810         }
811         if (x->lastused) {
812                 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
813                                         XFRMA_PAD);
814                 if (ret)
815                         goto out;
816         }
817         if (x->aead) {
818                 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
819                 if (ret)
820                         goto out;
821         }
822         if (x->aalg) {
823                 ret = copy_to_user_auth(x->aalg, skb);
824                 if (!ret)
825                         ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
826                                       xfrm_alg_auth_len(x->aalg), x->aalg);
827                 if (ret)
828                         goto out;
829         }
830         if (x->ealg) {
831                 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
832                 if (ret)
833                         goto out;
834         }
835         if (x->calg) {
836                 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
837                 if (ret)
838                         goto out;
839         }
840         if (x->encap) {
841                 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
842                 if (ret)
843                         goto out;
844         }
845         if (x->tfcpad) {
846                 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
847                 if (ret)
848                         goto out;
849         }
850         ret = xfrm_mark_put(skb, &x->mark);
851         if (ret)
852                 goto out;
853         if (x->replay_esn)
854                 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
855                               xfrm_replay_state_esn_len(x->replay_esn),
856                               x->replay_esn);
857         else
858                 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
859                               &x->replay);
860         if (ret)
861                 goto out;
862         if (x->security)
863                 ret = copy_sec_ctx(x->security, skb);
864 out:
865         return ret;
866 }
867 
868 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
869 {
870         struct xfrm_dump_info *sp = ptr;
871         struct sk_buff *in_skb = sp->in_skb;
872         struct sk_buff *skb = sp->out_skb;
873         struct xfrm_usersa_info *p;
874         struct nlmsghdr *nlh;
875         int err;
876 
877         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
878                         XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
879         if (nlh == NULL)
880                 return -EMSGSIZE;
881 
882         p = nlmsg_data(nlh);
883 
884         err = copy_to_user_state_extra(x, p, skb);
885         if (err) {
886                 nlmsg_cancel(skb, nlh);
887                 return err;
888         }
889         nlmsg_end(skb, nlh);
890         return 0;
891 }
892 
893 static int xfrm_dump_sa_done(struct netlink_callback *cb)
894 {
895         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
896         struct sock *sk = cb->skb->sk;
897         struct net *net = sock_net(sk);
898 
899         xfrm_state_walk_done(walk, net);
900         return 0;
901 }
902 
903 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
904 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
905 {
906         struct net *net = sock_net(skb->sk);
907         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
908         struct xfrm_dump_info info;
909 
910         BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
911                      sizeof(cb->args) - sizeof(cb->args[0]));
912 
913         info.in_skb = cb->skb;
914         info.out_skb = skb;
915         info.nlmsg_seq = cb->nlh->nlmsg_seq;
916         info.nlmsg_flags = NLM_F_MULTI;
917 
918         if (!cb->args[0]) {
919                 struct nlattr *attrs[XFRMA_MAX+1];
920                 struct xfrm_address_filter *filter = NULL;
921                 u8 proto = 0;
922                 int err;
923 
924                 cb->args[0] = 1;
925 
926                 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
927                                   xfrma_policy);
928                 if (err < 0)
929                         return err;
930 
931                 if (attrs[XFRMA_ADDRESS_FILTER]) {
932                         filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
933                                          sizeof(*filter), GFP_KERNEL);
934                         if (filter == NULL)
935                                 return -ENOMEM;
936                 }
937 
938                 if (attrs[XFRMA_PROTO])
939                         proto = nla_get_u8(attrs[XFRMA_PROTO]);
940 
941                 xfrm_state_walk_init(walk, proto, filter);
942         }
943 
944         (void) xfrm_state_walk(net, walk, dump_one_state, &info);
945 
946         return skb->len;
947 }
948 
949 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
950                                           struct xfrm_state *x, u32 seq)
951 {
952         struct xfrm_dump_info info;
953         struct sk_buff *skb;
954         int err;
955 
956         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
957         if (!skb)
958                 return ERR_PTR(-ENOMEM);
959 
960         info.in_skb = in_skb;
961         info.out_skb = skb;
962         info.nlmsg_seq = seq;
963         info.nlmsg_flags = 0;
964 
965         err = dump_one_state(x, 0, &info);
966         if (err) {
967                 kfree_skb(skb);
968                 return ERR_PTR(err);
969         }
970 
971         return skb;
972 }
973 
974 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
975  * Must be called with RCU read lock.
976  */
977 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
978                                        u32 pid, unsigned int group)
979 {
980         struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
981 
982         if (nlsk)
983                 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
984         else
985                 return -1;
986 }
987 
988 static inline size_t xfrm_spdinfo_msgsize(void)
989 {
990         return NLMSG_ALIGN(4)
991                + nla_total_size(sizeof(struct xfrmu_spdinfo))
992                + nla_total_size(sizeof(struct xfrmu_spdhinfo))
993                + nla_total_size(sizeof(struct xfrmu_spdhthresh))
994                + nla_total_size(sizeof(struct xfrmu_spdhthresh));
995 }
996 
997 static int build_spdinfo(struct sk_buff *skb, struct net *net,
998                          u32 portid, u32 seq, u32 flags)
999 {
1000         struct xfrmk_spdinfo si;
1001         struct xfrmu_spdinfo spc;
1002         struct xfrmu_spdhinfo sph;
1003         struct xfrmu_spdhthresh spt4, spt6;
1004         struct nlmsghdr *nlh;
1005         int err;
1006         u32 *f;
1007         unsigned lseq;
1008 
1009         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1010         if (nlh == NULL) /* shouldn't really happen ... */
1011                 return -EMSGSIZE;
1012 
1013         f = nlmsg_data(nlh);
1014         *f = flags;
1015         xfrm_spd_getinfo(net, &si);
1016         spc.incnt = si.incnt;
1017         spc.outcnt = si.outcnt;
1018         spc.fwdcnt = si.fwdcnt;
1019         spc.inscnt = si.inscnt;
1020         spc.outscnt = si.outscnt;
1021         spc.fwdscnt = si.fwdscnt;
1022         sph.spdhcnt = si.spdhcnt;
1023         sph.spdhmcnt = si.spdhmcnt;
1024 
1025         do {
1026                 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1027 
1028                 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1029                 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1030                 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1031                 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1032         } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1033 
1034         err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1035         if (!err)
1036                 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1037         if (!err)
1038                 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1039         if (!err)
1040                 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1041         if (err) {
1042                 nlmsg_cancel(skb, nlh);
1043                 return err;
1044         }
1045 
1046         nlmsg_end(skb, nlh);
1047         return 0;
1048 }
1049 
1050 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1051                             struct nlattr **attrs)
1052 {
1053         struct net *net = sock_net(skb->sk);
1054         struct xfrmu_spdhthresh *thresh4 = NULL;
1055         struct xfrmu_spdhthresh *thresh6 = NULL;
1056 
1057         /* selector prefixlen thresholds to hash policies */
1058         if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1059                 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1060 
1061                 if (nla_len(rta) < sizeof(*thresh4))
1062                         return -EINVAL;
1063                 thresh4 = nla_data(rta);
1064                 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1065                         return -EINVAL;
1066         }
1067         if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1068                 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1069 
1070                 if (nla_len(rta) < sizeof(*thresh6))
1071                         return -EINVAL;
1072                 thresh6 = nla_data(rta);
1073                 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1074                         return -EINVAL;
1075         }
1076 
1077         if (thresh4 || thresh6) {
1078                 write_seqlock(&net->xfrm.policy_hthresh.lock);
1079                 if (thresh4) {
1080                         net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1081                         net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1082                 }
1083                 if (thresh6) {
1084                         net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1085                         net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1086                 }
1087                 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1088 
1089                 xfrm_policy_hash_rebuild(net);
1090         }
1091 
1092         return 0;
1093 }
1094 
1095 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1096                 struct nlattr **attrs)
1097 {
1098         struct net *net = sock_net(skb->sk);
1099         struct sk_buff *r_skb;
1100         u32 *flags = nlmsg_data(nlh);
1101         u32 sportid = NETLINK_CB(skb).portid;
1102         u32 seq = nlh->nlmsg_seq;
1103 
1104         r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1105         if (r_skb == NULL)
1106                 return -ENOMEM;
1107 
1108         if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1109                 BUG();
1110 
1111         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1112 }
1113 
1114 static inline size_t xfrm_sadinfo_msgsize(void)
1115 {
1116         return NLMSG_ALIGN(4)
1117                + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1118                + nla_total_size(4); /* XFRMA_SAD_CNT */
1119 }
1120 
1121 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1122                          u32 portid, u32 seq, u32 flags)
1123 {
1124         struct xfrmk_sadinfo si;
1125         struct xfrmu_sadhinfo sh;
1126         struct nlmsghdr *nlh;
1127         int err;
1128         u32 *f;
1129 
1130         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1131         if (nlh == NULL) /* shouldn't really happen ... */
1132                 return -EMSGSIZE;
1133 
1134         f = nlmsg_data(nlh);
1135         *f = flags;
1136         xfrm_sad_getinfo(net, &si);
1137 
1138         sh.sadhmcnt = si.sadhmcnt;
1139         sh.sadhcnt = si.sadhcnt;
1140 
1141         err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1142         if (!err)
1143                 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1144         if (err) {
1145                 nlmsg_cancel(skb, nlh);
1146                 return err;
1147         }
1148 
1149         nlmsg_end(skb, nlh);
1150         return 0;
1151 }
1152 
1153 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1154                 struct nlattr **attrs)
1155 {
1156         struct net *net = sock_net(skb->sk);
1157         struct sk_buff *r_skb;
1158         u32 *flags = nlmsg_data(nlh);
1159         u32 sportid = NETLINK_CB(skb).portid;
1160         u32 seq = nlh->nlmsg_seq;
1161 
1162         r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1163         if (r_skb == NULL)
1164                 return -ENOMEM;
1165 
1166         if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1167                 BUG();
1168 
1169         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1170 }
1171 
1172 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1173                 struct nlattr **attrs)
1174 {
1175         struct net *net = sock_net(skb->sk);
1176         struct xfrm_usersa_id *p = nlmsg_data(nlh);
1177         struct xfrm_state *x;
1178         struct sk_buff *resp_skb;
1179         int err = -ESRCH;
1180 
1181         x = xfrm_user_state_lookup(net, p, attrs, &err);
1182         if (x == NULL)
1183                 goto out_noput;
1184 
1185         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1186         if (IS_ERR(resp_skb)) {
1187                 err = PTR_ERR(resp_skb);
1188         } else {
1189                 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1190         }
1191         xfrm_state_put(x);
1192 out_noput:
1193         return err;
1194 }
1195 
1196 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1197                 struct nlattr **attrs)
1198 {
1199         struct net *net = sock_net(skb->sk);
1200         struct xfrm_state *x;
1201         struct xfrm_userspi_info *p;
1202         struct sk_buff *resp_skb;
1203         xfrm_address_t *daddr;
1204         int family;
1205         int err;
1206         u32 mark;
1207         struct xfrm_mark m;
1208 
1209         p = nlmsg_data(nlh);
1210         err = verify_spi_info(p->info.id.proto, p->min, p->max);
1211         if (err)
1212                 goto out_noput;
1213 
1214         family = p->info.family;
1215         daddr = &p->info.id.daddr;
1216 
1217         x = NULL;
1218 
1219         mark = xfrm_mark_get(attrs, &m);
1220         if (p->info.seq) {
1221                 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1222                 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1223                         xfrm_state_put(x);
1224                         x = NULL;
1225                 }
1226         }
1227 
1228         if (!x)
1229                 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1230                                   p->info.id.proto, daddr,
1231                                   &p->info.saddr, 1,
1232                                   family);
1233         err = -ENOENT;
1234         if (x == NULL)
1235                 goto out_noput;
1236 
1237         err = xfrm_alloc_spi(x, p->min, p->max);
1238         if (err)
1239                 goto out;
1240 
1241         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1242         if (IS_ERR(resp_skb)) {
1243                 err = PTR_ERR(resp_skb);
1244                 goto out;
1245         }
1246 
1247         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1248 
1249 out:
1250         xfrm_state_put(x);
1251 out_noput:
1252         return err;
1253 }
1254 
1255 static int verify_policy_dir(u8 dir)
1256 {
1257         switch (dir) {
1258         case XFRM_POLICY_IN:
1259         case XFRM_POLICY_OUT:
1260         case XFRM_POLICY_FWD:
1261                 break;
1262 
1263         default:
1264                 return -EINVAL;
1265         }
1266 
1267         return 0;
1268 }
1269 
1270 static int verify_policy_type(u8 type)
1271 {
1272         switch (type) {
1273         case XFRM_POLICY_TYPE_MAIN:
1274 #ifdef CONFIG_XFRM_SUB_POLICY
1275         case XFRM_POLICY_TYPE_SUB:
1276 #endif
1277                 break;
1278 
1279         default:
1280                 return -EINVAL;
1281         }
1282 
1283         return 0;
1284 }
1285 
1286 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1287 {
1288         int ret;
1289 
1290         switch (p->share) {
1291         case XFRM_SHARE_ANY:
1292         case XFRM_SHARE_SESSION:
1293         case XFRM_SHARE_USER:
1294         case XFRM_SHARE_UNIQUE:
1295                 break;
1296 
1297         default:
1298                 return -EINVAL;
1299         }
1300 
1301         switch (p->action) {
1302         case XFRM_POLICY_ALLOW:
1303         case XFRM_POLICY_BLOCK:
1304                 break;
1305 
1306         default:
1307                 return -EINVAL;
1308         }
1309 
1310         switch (p->sel.family) {
1311         case AF_INET:
1312                 break;
1313 
1314         case AF_INET6:
1315 #if IS_ENABLED(CONFIG_IPV6)
1316                 break;
1317 #else
1318                 return  -EAFNOSUPPORT;
1319 #endif
1320 
1321         default:
1322                 return -EINVAL;
1323         }
1324 
1325         ret = verify_policy_dir(p->dir);
1326         if (ret)
1327                 return ret;
1328         if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1329                 return -EINVAL;
1330 
1331         return 0;
1332 }
1333 
1334 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1335 {
1336         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1337         struct xfrm_user_sec_ctx *uctx;
1338 
1339         if (!rt)
1340                 return 0;
1341 
1342         uctx = nla_data(rt);
1343         return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1344 }
1345 
1346 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1347                            int nr)
1348 {
1349         int i;
1350 
1351         xp->xfrm_nr = nr;
1352         for (i = 0; i < nr; i++, ut++) {
1353                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1354 
1355                 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1356                 memcpy(&t->saddr, &ut->saddr,
1357                        sizeof(xfrm_address_t));
1358                 t->reqid = ut->reqid;
1359                 t->mode = ut->mode;
1360                 t->share = ut->share;
1361                 t->optional = ut->optional;
1362                 t->aalgos = ut->aalgos;
1363                 t->ealgos = ut->ealgos;
1364                 t->calgos = ut->calgos;
1365                 /* If all masks are ~0, then we allow all algorithms. */
1366                 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1367                 t->encap_family = ut->family;
1368         }
1369 }
1370 
1371 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1372 {
1373         int i;
1374 
1375         if (nr > XFRM_MAX_DEPTH)
1376                 return -EINVAL;
1377 
1378         for (i = 0; i < nr; i++) {
1379                 /* We never validated the ut->family value, so many
1380                  * applications simply leave it at zero.  The check was
1381                  * never made and ut->family was ignored because all
1382                  * templates could be assumed to have the same family as
1383                  * the policy itself.  Now that we will have ipv4-in-ipv6
1384                  * and ipv6-in-ipv4 tunnels, this is no longer true.
1385                  */
1386                 if (!ut[i].family)
1387                         ut[i].family = family;
1388 
1389                 switch (ut[i].family) {
1390                 case AF_INET:
1391                         break;
1392 #if IS_ENABLED(CONFIG_IPV6)
1393                 case AF_INET6:
1394                         break;
1395 #endif
1396                 default:
1397                         return -EINVAL;
1398                 }
1399         }
1400 
1401         return 0;
1402 }
1403 
1404 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1405 {
1406         struct nlattr *rt = attrs[XFRMA_TMPL];
1407 
1408         if (!rt) {
1409                 pol->xfrm_nr = 0;
1410         } else {
1411                 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1412                 int nr = nla_len(rt) / sizeof(*utmpl);
1413                 int err;
1414 
1415                 err = validate_tmpl(nr, utmpl, pol->family);
1416                 if (err)
1417                         return err;
1418 
1419                 copy_templates(pol, utmpl, nr);
1420         }
1421         return 0;
1422 }
1423 
1424 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1425 {
1426         struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1427         struct xfrm_userpolicy_type *upt;
1428         u8 type = XFRM_POLICY_TYPE_MAIN;
1429         int err;
1430 
1431         if (rt) {
1432                 upt = nla_data(rt);
1433                 type = upt->type;
1434         }
1435 
1436         err = verify_policy_type(type);
1437         if (err)
1438                 return err;
1439 
1440         *tp = type;
1441         return 0;
1442 }
1443 
1444 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1445 {
1446         xp->priority = p->priority;
1447         xp->index = p->index;
1448         memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1449         memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1450         xp->action = p->action;
1451         xp->flags = p->flags;
1452         xp->family = p->sel.family;
1453         /* XXX xp->share = p->share; */
1454 }
1455 
1456 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1457 {
1458         memset(p, 0, sizeof(*p));
1459         memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1460         memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1461         memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1462         p->priority = xp->priority;
1463         p->index = xp->index;
1464         p->sel.family = xp->family;
1465         p->dir = dir;
1466         p->action = xp->action;
1467         p->flags = xp->flags;
1468         p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1469 }
1470 
1471 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1472 {
1473         struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1474         int err;
1475 
1476         if (!xp) {
1477                 *errp = -ENOMEM;
1478                 return NULL;
1479         }
1480 
1481         copy_from_user_policy(xp, p);
1482 
1483         err = copy_from_user_policy_type(&xp->type, attrs);
1484         if (err)
1485                 goto error;
1486 
1487         if (!(err = copy_from_user_tmpl(xp, attrs)))
1488                 err = copy_from_user_sec_ctx(xp, attrs);
1489         if (err)
1490                 goto error;
1491 
1492         xfrm_mark_get(attrs, &xp->mark);
1493 
1494         return xp;
1495  error:
1496         *errp = err;
1497         xp->walk.dead = 1;
1498         xfrm_policy_destroy(xp);
1499         return NULL;
1500 }
1501 
1502 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1503                 struct nlattr **attrs)
1504 {
1505         struct net *net = sock_net(skb->sk);
1506         struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1507         struct xfrm_policy *xp;
1508         struct km_event c;
1509         int err;
1510         int excl;
1511 
1512         err = verify_newpolicy_info(p);
1513         if (err)
1514                 return err;
1515         err = verify_sec_ctx_len(attrs);
1516         if (err)
1517                 return err;
1518 
1519         xp = xfrm_policy_construct(net, p, attrs, &err);
1520         if (!xp)
1521                 return err;
1522 
1523         /* shouldn't excl be based on nlh flags??
1524          * Aha! this is anti-netlink really i.e  more pfkey derived
1525          * in netlink excl is a flag and you wouldnt need
1526          * a type XFRM_MSG_UPDPOLICY - JHS */
1527         excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1528         err = xfrm_policy_insert(p->dir, xp, excl);
1529         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1530 
1531         if (err) {
1532                 security_xfrm_policy_free(xp->security);
1533                 kfree(xp);
1534                 return err;
1535         }
1536 
1537         c.event = nlh->nlmsg_type;
1538         c.seq = nlh->nlmsg_seq;
1539         c.portid = nlh->nlmsg_pid;
1540         km_policy_notify(xp, p->dir, &c);
1541 
1542         xfrm_pol_put(xp);
1543 
1544         return 0;
1545 }
1546 
1547 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1548 {
1549         struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1550         int i;
1551 
1552         if (xp->xfrm_nr == 0)
1553                 return 0;
1554 
1555         for (i = 0; i < xp->xfrm_nr; i++) {
1556                 struct xfrm_user_tmpl *up = &vec[i];
1557                 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1558 
1559                 memset(up, 0, sizeof(*up));
1560                 memcpy(&up->id, &kp->id, sizeof(up->id));
1561                 up->family = kp->encap_family;
1562                 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1563                 up->reqid = kp->reqid;
1564                 up->mode = kp->mode;
1565                 up->share = kp->share;
1566                 up->optional = kp->optional;
1567                 up->aalgos = kp->aalgos;
1568                 up->ealgos = kp->ealgos;
1569                 up->calgos = kp->calgos;
1570         }
1571 
1572         return nla_put(skb, XFRMA_TMPL,
1573                        sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1574 }
1575 
1576 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1577 {
1578         if (x->security) {
1579                 return copy_sec_ctx(x->security, skb);
1580         }
1581         return 0;
1582 }
1583 
1584 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1585 {
1586         if (xp->security)
1587                 return copy_sec_ctx(xp->security, skb);
1588         return 0;
1589 }
1590 static inline size_t userpolicy_type_attrsize(void)
1591 {
1592 #ifdef CONFIG_XFRM_SUB_POLICY
1593         return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1594 #else
1595         return 0;
1596 #endif
1597 }
1598 
1599 #ifdef CONFIG_XFRM_SUB_POLICY
1600 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1601 {
1602         struct xfrm_userpolicy_type upt = {
1603                 .type = type,
1604         };
1605 
1606         return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1607 }
1608 
1609 #else
1610 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1611 {
1612         return 0;
1613 }
1614 #endif
1615 
1616 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1617 {
1618         struct xfrm_dump_info *sp = ptr;
1619         struct xfrm_userpolicy_info *p;
1620         struct sk_buff *in_skb = sp->in_skb;
1621         struct sk_buff *skb = sp->out_skb;
1622         struct nlmsghdr *nlh;
1623         int err;
1624 
1625         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1626                         XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1627         if (nlh == NULL)
1628                 return -EMSGSIZE;
1629 
1630         p = nlmsg_data(nlh);
1631         copy_to_user_policy(xp, p, dir);
1632         err = copy_to_user_tmpl(xp, skb);
1633         if (!err)
1634                 err = copy_to_user_sec_ctx(xp, skb);
1635         if (!err)
1636                 err = copy_to_user_policy_type(xp->type, skb);
1637         if (!err)
1638                 err = xfrm_mark_put(skb, &xp->mark);
1639         if (err) {
1640                 nlmsg_cancel(skb, nlh);
1641                 return err;
1642         }
1643         nlmsg_end(skb, nlh);
1644         return 0;
1645 }
1646 
1647 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1648 {
1649         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1650         struct net *net = sock_net(cb->skb->sk);
1651 
1652         xfrm_policy_walk_done(walk, net);
1653         return 0;
1654 }
1655 
1656 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1657 {
1658         struct net *net = sock_net(skb->sk);
1659         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1660         struct xfrm_dump_info info;
1661 
1662         BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1663                      sizeof(cb->args) - sizeof(cb->args[0]));
1664 
1665         info.in_skb = cb->skb;
1666         info.out_skb = skb;
1667         info.nlmsg_seq = cb->nlh->nlmsg_seq;
1668         info.nlmsg_flags = NLM_F_MULTI;
1669 
1670         if (!cb->args[0]) {
1671                 cb->args[0] = 1;
1672                 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1673         }
1674 
1675         (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1676 
1677         return skb->len;
1678 }
1679 
1680 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1681                                           struct xfrm_policy *xp,
1682                                           int dir, u32 seq)
1683 {
1684         struct xfrm_dump_info info;
1685         struct sk_buff *skb;
1686         int err;
1687 
1688         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1689         if (!skb)
1690                 return ERR_PTR(-ENOMEM);
1691 
1692         info.in_skb = in_skb;
1693         info.out_skb = skb;
1694         info.nlmsg_seq = seq;
1695         info.nlmsg_flags = 0;
1696 
1697         err = dump_one_policy(xp, dir, 0, &info);
1698         if (err) {
1699                 kfree_skb(skb);
1700                 return ERR_PTR(err);
1701         }
1702 
1703         return skb;
1704 }
1705 
1706 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1707                 struct nlattr **attrs)
1708 {
1709         struct net *net = sock_net(skb->sk);
1710         struct xfrm_policy *xp;
1711         struct xfrm_userpolicy_id *p;
1712         u8 type = XFRM_POLICY_TYPE_MAIN;
1713         int err;
1714         struct km_event c;
1715         int delete;
1716         struct xfrm_mark m;
1717         u32 mark = xfrm_mark_get(attrs, &m);
1718 
1719         p = nlmsg_data(nlh);
1720         delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1721 
1722         err = copy_from_user_policy_type(&type, attrs);
1723         if (err)
1724                 return err;
1725 
1726         err = verify_policy_dir(p->dir);
1727         if (err)
1728                 return err;
1729 
1730         if (p->index)
1731                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1732         else {
1733                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1734                 struct xfrm_sec_ctx *ctx;
1735 
1736                 err = verify_sec_ctx_len(attrs);
1737                 if (err)
1738                         return err;
1739 
1740                 ctx = NULL;
1741                 if (rt) {
1742                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1743 
1744                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1745                         if (err)
1746                                 return err;
1747                 }
1748                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1749                                            ctx, delete, &err);
1750                 security_xfrm_policy_free(ctx);
1751         }
1752         if (xp == NULL)
1753                 return -ENOENT;
1754 
1755         if (!delete) {
1756                 struct sk_buff *resp_skb;
1757 
1758                 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1759                 if (IS_ERR(resp_skb)) {
1760                         err = PTR_ERR(resp_skb);
1761                 } else {
1762                         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1763                                             NETLINK_CB(skb).portid);
1764                 }
1765         } else {
1766                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1767 
1768                 if (err != 0)
1769                         goto out;
1770 
1771                 c.data.byid = p->index;
1772                 c.event = nlh->nlmsg_type;
1773                 c.seq = nlh->nlmsg_seq;
1774                 c.portid = nlh->nlmsg_pid;
1775                 km_policy_notify(xp, p->dir, &c);
1776         }
1777 
1778 out:
1779         xfrm_pol_put(xp);
1780         if (delete && err == 0)
1781                 xfrm_garbage_collect(net);
1782         return err;
1783 }
1784 
1785 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1786                 struct nlattr **attrs)
1787 {
1788         struct net *net = sock_net(skb->sk);
1789         struct km_event c;
1790         struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1791         int err;
1792 
1793         err = xfrm_state_flush(net, p->proto, true);
1794         if (err) {
1795                 if (err == -ESRCH) /* empty table */
1796                         return 0;
1797                 return err;
1798         }
1799         c.data.proto = p->proto;
1800         c.event = nlh->nlmsg_type;
1801         c.seq = nlh->nlmsg_seq;
1802         c.portid = nlh->nlmsg_pid;
1803         c.net = net;
1804         km_state_notify(NULL, &c);
1805 
1806         return 0;
1807 }
1808 
1809 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1810 {
1811         size_t replay_size = x->replay_esn ?
1812                               xfrm_replay_state_esn_len(x->replay_esn) :
1813                               sizeof(struct xfrm_replay_state);
1814 
1815         return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1816                + nla_total_size(replay_size)
1817                + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1818                + nla_total_size(sizeof(struct xfrm_mark))
1819                + nla_total_size(4) /* XFRM_AE_RTHR */
1820                + nla_total_size(4); /* XFRM_AE_ETHR */
1821 }
1822 
1823 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1824 {
1825         struct xfrm_aevent_id *id;
1826         struct nlmsghdr *nlh;
1827         int err;
1828 
1829         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1830         if (nlh == NULL)
1831                 return -EMSGSIZE;
1832 
1833         id = nlmsg_data(nlh);
1834         memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1835         id->sa_id.spi = x->id.spi;
1836         id->sa_id.family = x->props.family;
1837         id->sa_id.proto = x->id.proto;
1838         memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1839         id->reqid = x->props.reqid;
1840         id->flags = c->data.aevent;
1841 
1842         if (x->replay_esn) {
1843                 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1844                               xfrm_replay_state_esn_len(x->replay_esn),
1845                               x->replay_esn);
1846         } else {
1847                 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1848                               &x->replay);
1849         }
1850         if (err)
1851                 goto out_cancel;
1852         err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1853                             XFRMA_PAD);
1854         if (err)
1855                 goto out_cancel;
1856 
1857         if (id->flags & XFRM_AE_RTHR) {
1858                 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1859                 if (err)
1860                         goto out_cancel;
1861         }
1862         if (id->flags & XFRM_AE_ETHR) {
1863                 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1864                                   x->replay_maxage * 10 / HZ);
1865                 if (err)
1866                         goto out_cancel;
1867         }
1868         err = xfrm_mark_put(skb, &x->mark);
1869         if (err)
1870                 goto out_cancel;
1871 
1872         nlmsg_end(skb, nlh);
1873         return 0;
1874 
1875 out_cancel:
1876         nlmsg_cancel(skb, nlh);
1877         return err;
1878 }
1879 
1880 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1881                 struct nlattr **attrs)
1882 {
1883         struct net *net = sock_net(skb->sk);
1884         struct xfrm_state *x;
1885         struct sk_buff *r_skb;
1886         int err;
1887         struct km_event c;
1888         u32 mark;
1889         struct xfrm_mark m;
1890         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1891         struct xfrm_usersa_id *id = &p->sa_id;
1892 
1893         mark = xfrm_mark_get(attrs, &m);
1894 
1895         x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1896         if (x == NULL)
1897                 return -ESRCH;
1898 
1899         r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1900         if (r_skb == NULL) {
1901                 xfrm_state_put(x);
1902                 return -ENOMEM;
1903         }
1904 
1905         /*
1906          * XXX: is this lock really needed - none of the other
1907          * gets lock (the concern is things getting updated
1908          * while we are still reading) - jhs
1909         */
1910         spin_lock_bh(&x->lock);
1911         c.data.aevent = p->flags;
1912         c.seq = nlh->nlmsg_seq;
1913         c.portid = nlh->nlmsg_pid;
1914 
1915         if (build_aevent(r_skb, x, &c) < 0)
1916                 BUG();
1917         err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1918         spin_unlock_bh(&x->lock);
1919         xfrm_state_put(x);
1920         return err;
1921 }
1922 
1923 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1924                 struct nlattr **attrs)
1925 {
1926         struct net *net = sock_net(skb->sk);
1927         struct xfrm_state *x;
1928         struct km_event c;
1929         int err = -EINVAL;
1930         u32 mark = 0;
1931         struct xfrm_mark m;
1932         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1933         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1934         struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1935         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1936         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1937         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
1938 
1939         if (!lt && !rp && !re && !et && !rt)
1940                 return err;
1941 
1942         /* pedantic mode - thou shalt sayeth replaceth */
1943         if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1944                 return err;
1945 
1946         mark = xfrm_mark_get(attrs, &m);
1947 
1948         x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1949         if (x == NULL)
1950                 return -ESRCH;
1951 
1952         if (x->km.state != XFRM_STATE_VALID)
1953                 goto out;
1954 
1955         err = xfrm_replay_verify_len(x->replay_esn, re);
1956         if (err)
1957                 goto out;
1958 
1959         spin_lock_bh(&x->lock);
1960         xfrm_update_ae_params(x, attrs, 1);
1961         spin_unlock_bh(&x->lock);
1962 
1963         c.event = nlh->nlmsg_type;
1964         c.seq = nlh->nlmsg_seq;
1965         c.portid = nlh->nlmsg_pid;
1966         c.data.aevent = XFRM_AE_CU;
1967         km_state_notify(x, &c);
1968         err = 0;
1969 out:
1970         xfrm_state_put(x);
1971         return err;
1972 }
1973 
1974 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1975                 struct nlattr **attrs)
1976 {
1977         struct net *net = sock_net(skb->sk);
1978         struct km_event c;
1979         u8 type = XFRM_POLICY_TYPE_MAIN;
1980         int err;
1981 
1982         err = copy_from_user_policy_type(&type, attrs);
1983         if (err)
1984                 return err;
1985 
1986         err = xfrm_policy_flush(net, type, true);
1987         if (err) {
1988                 if (err == -ESRCH) /* empty table */
1989                         return 0;
1990                 return err;
1991         }
1992 
1993         c.data.type = type;
1994         c.event = nlh->nlmsg_type;
1995         c.seq = nlh->nlmsg_seq;
1996         c.portid = nlh->nlmsg_pid;
1997         c.net = net;
1998         km_policy_notify(NULL, 0, &c);
1999         return 0;
2000 }
2001 
2002 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2003                 struct nlattr **attrs)
2004 {
2005         struct net *net = sock_net(skb->sk);
2006         struct xfrm_policy *xp;
2007         struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2008         struct xfrm_userpolicy_info *p = &up->pol;
2009         u8 type = XFRM_POLICY_TYPE_MAIN;
2010         int err = -ENOENT;
2011         struct xfrm_mark m;
2012         u32 mark = xfrm_mark_get(attrs, &m);
2013 
2014         err = copy_from_user_policy_type(&type, attrs);
2015         if (err)
2016                 return err;
2017 
2018         err = verify_policy_dir(p->dir);
2019         if (err)
2020                 return err;
2021 
2022         if (p->index)
2023                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2024         else {
2025                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2026                 struct xfrm_sec_ctx *ctx;
2027 
2028                 err = verify_sec_ctx_len(attrs);
2029                 if (err)
2030                         return err;
2031 
2032                 ctx = NULL;
2033                 if (rt) {
2034                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2035 
2036                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2037                         if (err)
2038                                 return err;
2039                 }
2040                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2041                                            &p->sel, ctx, 0, &err);
2042                 security_xfrm_policy_free(ctx);
2043         }
2044         if (xp == NULL)
2045                 return -ENOENT;
2046 
2047         if (unlikely(xp->walk.dead))
2048                 goto out;
2049 
2050         err = 0;
2051         if (up->hard) {
2052                 xfrm_policy_delete(xp, p->dir);
2053                 xfrm_audit_policy_delete(xp, 1, true);
2054         } else {
2055                 // reset the timers here?
2056                 WARN(1, "Don't know what to do with soft policy expire\n");
2057         }
2058         km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2059 
2060 out:
2061         xfrm_pol_put(xp);
2062         return err;
2063 }
2064 
2065 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2066                 struct nlattr **attrs)
2067 {
2068         struct net *net = sock_net(skb->sk);
2069         struct xfrm_state *x;
2070         int err;
2071         struct xfrm_user_expire *ue = nlmsg_data(nlh);
2072         struct xfrm_usersa_info *p = &ue->state;
2073         struct xfrm_mark m;
2074         u32 mark = xfrm_mark_get(attrs, &m);
2075 
2076         x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2077 
2078         err = -ENOENT;
2079         if (x == NULL)
2080                 return err;
2081 
2082         spin_lock_bh(&x->lock);
2083         err = -EINVAL;
2084         if (x->km.state != XFRM_STATE_VALID)
2085                 goto out;
2086         km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2087 
2088         if (ue->hard) {
2089                 __xfrm_state_delete(x);
2090                 xfrm_audit_state_delete(x, 1, true);
2091         }
2092         err = 0;
2093 out:
2094         spin_unlock_bh(&x->lock);
2095         xfrm_state_put(x);
2096         return err;
2097 }
2098 
2099 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2100                 struct nlattr **attrs)
2101 {
2102         struct net *net = sock_net(skb->sk);
2103         struct xfrm_policy *xp;
2104         struct xfrm_user_tmpl *ut;
2105         int i;
2106         struct nlattr *rt = attrs[XFRMA_TMPL];
2107         struct xfrm_mark mark;
2108 
2109         struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2110         struct xfrm_state *x = xfrm_state_alloc(net);
2111         int err = -ENOMEM;
2112 
2113         if (!x)
2114                 goto nomem;
2115 
2116         xfrm_mark_get(attrs, &mark);
2117 
2118         err = verify_newpolicy_info(&ua->policy);
2119         if (err)
2120                 goto bad_policy;
2121 
2122         /*   build an XP */
2123         xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2124         if (!xp)
2125                 goto free_state;
2126 
2127         memcpy(&x->id, &ua->id, sizeof(ua->id));
2128         memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2129         memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2130         xp->mark.m = x->mark.m = mark.m;
2131         xp->mark.v = x->mark.v = mark.v;
2132         ut = nla_data(rt);
2133         /* extract the templates and for each call km_key */
2134         for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2135                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2136                 memcpy(&x->id, &t->id, sizeof(x->id));
2137                 x->props.mode = t->mode;
2138                 x->props.reqid = t->reqid;
2139                 x->props.family = ut->family;
2140                 t->aalgos = ua->aalgos;
2141                 t->ealgos = ua->ealgos;
2142                 t->calgos = ua->calgos;
2143                 err = km_query(x, t, xp);
2144 
2145         }
2146 
2147         kfree(x);
2148         kfree(xp);
2149 
2150         return 0;
2151 
2152 bad_policy:
2153         WARN(1, "BAD policy passed\n");
2154 free_state:
2155         kfree(x);
2156 nomem:
2157         return err;
2158 }
2159 
2160 #ifdef CONFIG_XFRM_MIGRATE
2161 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2162                                   struct xfrm_kmaddress *k,
2163                                   struct nlattr **attrs, int *num)
2164 {
2165         struct nlattr *rt = attrs[XFRMA_MIGRATE];
2166         struct xfrm_user_migrate *um;
2167         int i, num_migrate;
2168 
2169         if (k != NULL) {
2170                 struct xfrm_user_kmaddress *uk;
2171 
2172                 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2173                 memcpy(&k->local, &uk->local, sizeof(k->local));
2174                 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2175                 k->family = uk->family;
2176                 k->reserved = uk->reserved;
2177         }
2178 
2179         um = nla_data(rt);
2180         num_migrate = nla_len(rt) / sizeof(*um);
2181 
2182         if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2183                 return -EINVAL;
2184 
2185         for (i = 0; i < num_migrate; i++, um++, ma++) {
2186                 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2187                 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2188                 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2189                 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2190 
2191                 ma->proto = um->proto;
2192                 ma->mode = um->mode;
2193                 ma->reqid = um->reqid;
2194 
2195                 ma->old_family = um->old_family;
2196                 ma->new_family = um->new_family;
2197         }
2198 
2199         *num = i;
2200         return 0;
2201 }
2202 
2203 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2204                            struct nlattr **attrs)
2205 {
2206         struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2207         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2208         struct xfrm_kmaddress km, *kmp;
2209         u8 type;
2210         int err;
2211         int n = 0;
2212         struct net *net = sock_net(skb->sk);
2213 
2214         if (attrs[XFRMA_MIGRATE] == NULL)
2215                 return -EINVAL;
2216 
2217         kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2218 
2219         err = copy_from_user_policy_type(&type, attrs);
2220         if (err)
2221                 return err;
2222 
2223         err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2224         if (err)
2225                 return err;
2226 
2227         if (!n)
2228                 return 0;
2229 
2230         xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2231 
2232         return 0;
2233 }
2234 #else
2235 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2236                            struct nlattr **attrs)
2237 {
2238         return -ENOPROTOOPT;
2239 }
2240 #endif
2241 
2242 #ifdef CONFIG_XFRM_MIGRATE
2243 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2244 {
2245         struct xfrm_user_migrate um;
2246 
2247         memset(&um, 0, sizeof(um));
2248         um.proto = m->proto;
2249         um.mode = m->mode;
2250         um.reqid = m->reqid;
2251         um.old_family = m->old_family;
2252         memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2253         memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2254         um.new_family = m->new_family;
2255         memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2256         memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2257 
2258         return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2259 }
2260 
2261 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2262 {
2263         struct xfrm_user_kmaddress uk;
2264 
2265         memset(&uk, 0, sizeof(uk));
2266         uk.family = k->family;
2267         uk.reserved = k->reserved;
2268         memcpy(&uk.local, &k->local, sizeof(uk.local));
2269         memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2270 
2271         return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2272 }
2273 
2274 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2275 {
2276         return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2277               + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2278               + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2279               + userpolicy_type_attrsize();
2280 }
2281 
2282 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2283                          int num_migrate, const struct xfrm_kmaddress *k,
2284                          const struct xfrm_selector *sel, u8 dir, u8 type)
2285 {
2286         const struct xfrm_migrate *mp;
2287         struct xfrm_userpolicy_id *pol_id;
2288         struct nlmsghdr *nlh;
2289         int i, err;
2290 
2291         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2292         if (nlh == NULL)
2293                 return -EMSGSIZE;
2294 
2295         pol_id = nlmsg_data(nlh);
2296         /* copy data from selector, dir, and type to the pol_id */
2297         memset(pol_id, 0, sizeof(*pol_id));
2298         memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2299         pol_id->dir = dir;
2300 
2301         if (k != NULL) {
2302                 err = copy_to_user_kmaddress(k, skb);
2303                 if (err)
2304                         goto out_cancel;
2305         }
2306         err = copy_to_user_policy_type(type, skb);
2307         if (err)
2308                 goto out_cancel;
2309         for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2310                 err = copy_to_user_migrate(mp, skb);
2311                 if (err)
2312                         goto out_cancel;
2313         }
2314 
2315         nlmsg_end(skb, nlh);
2316         return 0;
2317 
2318 out_cancel:
2319         nlmsg_cancel(skb, nlh);
2320         return err;
2321 }
2322 
2323 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2324                              const struct xfrm_migrate *m, int num_migrate,
2325                              const struct xfrm_kmaddress *k)
2326 {
2327         struct net *net = &init_net;
2328         struct sk_buff *skb;
2329 
2330         skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2331         if (skb == NULL)
2332                 return -ENOMEM;
2333 
2334         /* build migrate */
2335         if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2336                 BUG();
2337 
2338         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2339 }
2340 #else
2341 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2342                              const struct xfrm_migrate *m, int num_migrate,
2343                              const struct xfrm_kmaddress *k)
2344 {
2345         return -ENOPROTOOPT;
2346 }
2347 #endif
2348 
2349 #define XMSGSIZE(type) sizeof(struct type)
2350 
2351 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2352         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2353         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2354         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2355         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2356         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2357         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2358         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2359         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2360         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2361         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2362         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2363         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2364         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2365         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2366         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2367         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2368         [XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2369         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2370         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2371         [XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2372         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2373 };
2374 
2375 #undef XMSGSIZE
2376 
2377 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2378         [XFRMA_SA]              = { .len = sizeof(struct xfrm_usersa_info)},
2379         [XFRMA_POLICY]          = { .len = sizeof(struct xfrm_userpolicy_info)},
2380         [XFRMA_LASTUSED]        = { .type = NLA_U64},
2381         [XFRMA_ALG_AUTH_TRUNC]  = { .len = sizeof(struct xfrm_algo_auth)},
2382         [XFRMA_ALG_AEAD]        = { .len = sizeof(struct xfrm_algo_aead) },
2383         [XFRMA_ALG_AUTH]        = { .len = sizeof(struct xfrm_algo) },
2384         [XFRMA_ALG_CRYPT]       = { .len = sizeof(struct xfrm_algo) },
2385         [XFRMA_ALG_COMP]        = { .len = sizeof(struct xfrm_algo) },
2386         [XFRMA_ENCAP]           = { .len = sizeof(struct xfrm_encap_tmpl) },
2387         [XFRMA_TMPL]            = { .len = sizeof(struct xfrm_user_tmpl) },
2388         [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_sec_ctx) },
2389         [XFRMA_LTIME_VAL]       = { .len = sizeof(struct xfrm_lifetime_cur) },
2390         [XFRMA_REPLAY_VAL]      = { .len = sizeof(struct xfrm_replay_state) },
2391         [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },
2392         [XFRMA_ETIMER_THRESH]   = { .type = NLA_U32 },
2393         [XFRMA_SRCADDR]         = { .len = sizeof(xfrm_address_t) },
2394         [XFRMA_COADDR]          = { .len = sizeof(xfrm_address_t) },
2395         [XFRMA_POLICY_TYPE]     = { .len = sizeof(struct xfrm_userpolicy_type)},
2396         [XFRMA_MIGRATE]         = { .len = sizeof(struct xfrm_user_migrate) },
2397         [XFRMA_KMADDRESS]       = { .len = sizeof(struct xfrm_user_kmaddress) },
2398         [XFRMA_MARK]            = { .len = sizeof(struct xfrm_mark) },
2399         [XFRMA_TFCPAD]          = { .type = NLA_U32 },
2400         [XFRMA_REPLAY_ESN_VAL]  = { .len = sizeof(struct xfrm_replay_state_esn) },
2401         [XFRMA_SA_EXTRA_FLAGS]  = { .type = NLA_U32 },
2402         [XFRMA_PROTO]           = { .type = NLA_U8 },
2403         [XFRMA_ADDRESS_FILTER]  = { .len = sizeof(struct xfrm_address_filter) },
2404 };
2405 
2406 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2407         [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2408         [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2409 };
2410 
2411 static const struct xfrm_link {
2412         int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2413         int (*dump)(struct sk_buff *, struct netlink_callback *);
2414         int (*done)(struct netlink_callback *);
2415         const struct nla_policy *nla_pol;
2416         int nla_max;
2417 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2418         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2419         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2420         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2421                                                    .dump = xfrm_dump_sa,
2422                                                    .done = xfrm_dump_sa_done  },
2423         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2424         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2425         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2426                                                    .dump = xfrm_dump_policy,
2427                                                    .done = xfrm_dump_policy_done },
2428         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2429         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2430         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2431         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2432         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2433         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2434         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2435         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2436         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2437         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2438         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2439         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2440         [XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2441                                                    .nla_pol = xfrma_spd_policy,
2442                                                    .nla_max = XFRMA_SPD_MAX },
2443         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2444 };
2445 
2446 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2447 {
2448         struct net *net = sock_net(skb->sk);
2449         struct nlattr *attrs[XFRMA_MAX+1];
2450         const struct xfrm_link *link;
2451         int type, err;
2452 
2453 #ifdef CONFIG_COMPAT
2454         if (in_compat_syscall())
2455                 return -ENOTSUPP;
2456 #endif
2457 
2458         type = nlh->nlmsg_type;
2459         if (type > XFRM_MSG_MAX)
2460                 return -EINVAL;
2461 
2462         type -= XFRM_MSG_BASE;
2463         link = &xfrm_dispatch[type];
2464 
2465         /* All operations require privileges, even GET */
2466         if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2467                 return -EPERM;
2468 
2469         if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2470              type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2471             (nlh->nlmsg_flags & NLM_F_DUMP)) {
2472                 if (link->dump == NULL)
2473                         return -EINVAL;
2474 
2475                 {
2476                         struct netlink_dump_control c = {
2477                                 .dump = link->dump,
2478                                 .done = link->done,
2479                         };
2480                         return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2481                 }
2482         }
2483 
2484         err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2485                           link->nla_max ? : XFRMA_MAX,
2486                           link->nla_pol ? : xfrma_policy);
2487         if (err < 0)
2488                 return err;
2489 
2490         if (link->doit == NULL)
2491                 return -EINVAL;
2492 
2493         return link->doit(skb, nlh, attrs);
2494 }
2495 
2496 static void xfrm_netlink_rcv(struct sk_buff *skb)
2497 {
2498         struct net *net = sock_net(skb->sk);
2499 
2500         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2501         netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2502         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2503 }
2504 
2505 static inline size_t xfrm_expire_msgsize(void)
2506 {
2507         return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2508                + nla_total_size(sizeof(struct xfrm_mark));
2509 }
2510 
2511 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2512 {
2513         struct xfrm_user_expire *ue;
2514         struct nlmsghdr *nlh;
2515         int err;
2516 
2517         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2518         if (nlh == NULL)
2519                 return -EMSGSIZE;
2520 
2521         ue = nlmsg_data(nlh);
2522         copy_to_user_state(x, &ue->state);
2523         ue->hard = (c->data.hard != 0) ? 1 : 0;
2524 
2525         err = xfrm_mark_put(skb, &x->mark);
2526         if (err)
2527                 return err;
2528 
2529         nlmsg_end(skb, nlh);
2530         return 0;
2531 }
2532 
2533 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2534 {
2535         struct net *net = xs_net(x);
2536         struct sk_buff *skb;
2537 
2538         skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2539         if (skb == NULL)
2540                 return -ENOMEM;
2541 
2542         if (build_expire(skb, x, c) < 0) {
2543                 kfree_skb(skb);
2544                 return -EMSGSIZE;
2545         }
2546 
2547         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2548 }
2549 
2550 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2551 {
2552         struct net *net = xs_net(x);
2553         struct sk_buff *skb;
2554 
2555         skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2556         if (skb == NULL)
2557                 return -ENOMEM;
2558 
2559         if (build_aevent(skb, x, c) < 0)
2560                 BUG();
2561 
2562         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2563 }
2564 
2565 static int xfrm_notify_sa_flush(const struct km_event *c)
2566 {
2567         struct net *net = c->net;
2568         struct xfrm_usersa_flush *p;
2569         struct nlmsghdr *nlh;
2570         struct sk_buff *skb;
2571         int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2572 
2573         skb = nlmsg_new(len, GFP_ATOMIC);
2574         if (skb == NULL)
2575                 return -ENOMEM;
2576 
2577         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2578         if (nlh == NULL) {
2579                 kfree_skb(skb);
2580                 return -EMSGSIZE;
2581         }
2582 
2583         p = nlmsg_data(nlh);
2584         p->proto = c->data.proto;
2585 
2586         nlmsg_end(skb, nlh);
2587 
2588         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2589 }
2590 
2591 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2592 {
2593         size_t l = 0;
2594         if (x->aead)
2595                 l += nla_total_size(aead_len(x->aead));
2596         if (x->aalg) {
2597                 l += nla_total_size(sizeof(struct xfrm_algo) +
2598                                     (x->aalg->alg_key_len + 7) / 8);
2599                 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2600         }
2601         if (x->ealg)
2602                 l += nla_total_size(xfrm_alg_len(x->ealg));
2603         if (x->calg)
2604                 l += nla_total_size(sizeof(*x->calg));
2605         if (x->encap)
2606                 l += nla_total_size(sizeof(*x->encap));
2607         if (x->tfcpad)
2608                 l += nla_total_size(sizeof(x->tfcpad));
2609         if (x->replay_esn)
2610                 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2611         else
2612                 l += nla_total_size(sizeof(struct xfrm_replay_state));
2613         if (x->security)
2614                 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2615                                     x->security->ctx_len);
2616         if (x->coaddr)
2617                 l += nla_total_size(sizeof(*x->coaddr));
2618         if (x->props.extra_flags)
2619                 l += nla_total_size(sizeof(x->props.extra_flags));
2620 
2621         /* Must count x->lastused as it may become non-zero behind our back. */
2622         l += nla_total_size_64bit(sizeof(u64));
2623 
2624         return l;
2625 }
2626 
2627 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2628 {
2629         struct net *net = xs_net(x);
2630         struct xfrm_usersa_info *p;
2631         struct xfrm_usersa_id *id;
2632         struct nlmsghdr *nlh;
2633         struct sk_buff *skb;
2634         int len = xfrm_sa_len(x);
2635         int headlen, err;
2636 
2637         headlen = sizeof(*p);
2638         if (c->event == XFRM_MSG_DELSA) {
2639                 len += nla_total_size(headlen);
2640                 headlen = sizeof(*id);
2641                 len += nla_total_size(sizeof(struct xfrm_mark));
2642         }
2643         len += NLMSG_ALIGN(headlen);
2644 
2645         skb = nlmsg_new(len, GFP_ATOMIC);
2646         if (skb == NULL)
2647                 return -ENOMEM;
2648 
2649         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2650         err = -EMSGSIZE;
2651         if (nlh == NULL)
2652                 goto out_free_skb;
2653 
2654         p = nlmsg_data(nlh);
2655         if (c->event == XFRM_MSG_DELSA) {
2656                 struct nlattr *attr;
2657 
2658                 id = nlmsg_data(nlh);
2659                 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2660                 id->spi = x->id.spi;
2661                 id->family = x->props.family;
2662                 id->proto = x->id.proto;
2663 
2664                 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2665                 err = -EMSGSIZE;
2666                 if (attr == NULL)
2667                         goto out_free_skb;
2668 
2669                 p = nla_data(attr);
2670         }
2671         err = copy_to_user_state_extra(x, p, skb);
2672         if (err)
2673                 goto out_free_skb;
2674 
2675         nlmsg_end(skb, nlh);
2676 
2677         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2678 
2679 out_free_skb:
2680         kfree_skb(skb);
2681         return err;
2682 }
2683 
2684 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2685 {
2686 
2687         switch (c->event) {
2688         case XFRM_MSG_EXPIRE:
2689                 return xfrm_exp_state_notify(x, c);
2690         case XFRM_MSG_NEWAE:
2691                 return xfrm_aevent_state_notify(x, c);
2692         case XFRM_MSG_DELSA:
2693         case XFRM_MSG_UPDSA:
2694         case XFRM_MSG_NEWSA:
2695                 return xfrm_notify_sa(x, c);
2696         case XFRM_MSG_FLUSHSA:
2697                 return xfrm_notify_sa_flush(c);
2698         default:
2699                 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2700                        c->event);
2701                 break;
2702         }
2703 
2704         return 0;
2705 
2706 }
2707 
2708 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2709                                           struct xfrm_policy *xp)
2710 {
2711         return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2712                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2713                + nla_total_size(sizeof(struct xfrm_mark))
2714                + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2715                + userpolicy_type_attrsize();
2716 }
2717 
2718 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2719                          struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2720 {
2721         __u32 seq = xfrm_get_acqseq();
2722         struct xfrm_user_acquire *ua;
2723         struct nlmsghdr *nlh;
2724         int err;
2725 
2726         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2727         if (nlh == NULL)
2728                 return -EMSGSIZE;
2729 
2730         ua = nlmsg_data(nlh);
2731         memcpy(&ua->id, &x->id, sizeof(ua->id));
2732         memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2733         memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2734         copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2735         ua->aalgos = xt->aalgos;
2736         ua->ealgos = xt->ealgos;
2737         ua->calgos = xt->calgos;
2738         ua->seq = x->km.seq = seq;
2739 
2740         err = copy_to_user_tmpl(xp, skb);
2741         if (!err)
2742                 err = copy_to_user_state_sec_ctx(x, skb);
2743         if (!err)
2744                 err = copy_to_user_policy_type(xp->type, skb);
2745         if (!err)
2746                 err = xfrm_mark_put(skb, &xp->mark);
2747         if (err) {
2748                 nlmsg_cancel(skb, nlh);
2749                 return err;
2750         }
2751 
2752         nlmsg_end(skb, nlh);
2753         return 0;
2754 }
2755 
2756 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2757                              struct xfrm_policy *xp)
2758 {
2759         struct net *net = xs_net(x);
2760         struct sk_buff *skb;
2761 
2762         skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2763         if (skb == NULL)
2764                 return -ENOMEM;
2765 
2766         if (build_acquire(skb, x, xt, xp) < 0)
2767                 BUG();
2768 
2769         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2770 }
2771 
2772 /* User gives us xfrm_user_policy_info followed by an array of 0
2773  * or more templates.
2774  */
2775 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2776                                                u8 *data, int len, int *dir)
2777 {
2778         struct net *net = sock_net(sk);
2779         struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2780         struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2781         struct xfrm_policy *xp;
2782         int nr;
2783 
2784         switch (sk->sk_family) {
2785         case AF_INET:
2786                 if (opt != IP_XFRM_POLICY) {
2787                         *dir = -EOPNOTSUPP;
2788                         return NULL;
2789                 }
2790                 break;
2791 #if IS_ENABLED(CONFIG_IPV6)
2792         case AF_INET6:
2793                 if (opt != IPV6_XFRM_POLICY) {
2794                         *dir = -EOPNOTSUPP;
2795                         return NULL;
2796                 }
2797                 break;
2798 #endif
2799         default:
2800                 *dir = -EINVAL;
2801                 return NULL;
2802         }
2803 
2804         *dir = -EINVAL;
2805 
2806         if (len < sizeof(*p) ||
2807             verify_newpolicy_info(p))
2808                 return NULL;
2809 
2810         nr = ((len - sizeof(*p)) / sizeof(*ut));
2811         if (validate_tmpl(nr, ut, p->sel.family))
2812                 return NULL;
2813 
2814         if (p->dir > XFRM_POLICY_OUT)
2815                 return NULL;
2816 
2817         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2818         if (xp == NULL) {
2819                 *dir = -ENOBUFS;
2820                 return NULL;
2821         }
2822 
2823         copy_from_user_policy(xp, p);
2824         xp->type = XFRM_POLICY_TYPE_MAIN;
2825         copy_templates(xp, ut, nr);
2826 
2827         *dir = p->dir;
2828 
2829         return xp;
2830 }
2831 
2832 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2833 {
2834         return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2835                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2836                + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2837                + nla_total_size(sizeof(struct xfrm_mark))
2838                + userpolicy_type_attrsize();
2839 }
2840 
2841 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2842                            int dir, const struct km_event *c)
2843 {
2844         struct xfrm_user_polexpire *upe;
2845         int hard = c->data.hard;
2846         struct nlmsghdr *nlh;
2847         int err;
2848 
2849         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2850         if (nlh == NULL)
2851                 return -EMSGSIZE;
2852 
2853         upe = nlmsg_data(nlh);
2854         copy_to_user_policy(xp, &upe->pol, dir);
2855         err = copy_to_user_tmpl(xp, skb);
2856         if (!err)
2857                 err = copy_to_user_sec_ctx(xp, skb);
2858         if (!err)
2859                 err = copy_to_user_policy_type(xp->type, skb);
2860         if (!err)
2861                 err = xfrm_mark_put(skb, &xp->mark);
2862         if (err) {
2863                 nlmsg_cancel(skb, nlh);
2864                 return err;
2865         }
2866         upe->hard = !!hard;
2867 
2868         nlmsg_end(skb, nlh);
2869         return 0;
2870 }
2871 
2872 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2873 {
2874         struct net *net = xp_net(xp);
2875         struct sk_buff *skb;
2876 
2877         skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2878         if (skb == NULL)
2879                 return -ENOMEM;
2880 
2881         if (build_polexpire(skb, xp, dir, c) < 0)
2882                 BUG();
2883 
2884         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2885 }
2886 
2887 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2888 {
2889         int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2890         struct net *net = xp_net(xp);
2891         struct xfrm_userpolicy_info *p;
2892         struct xfrm_userpolicy_id *id;
2893         struct nlmsghdr *nlh;
2894         struct sk_buff *skb;
2895         int headlen, err;
2896 
2897         headlen = sizeof(*p);
2898         if (c->event == XFRM_MSG_DELPOLICY) {
2899                 len += nla_total_size(headlen);
2900                 headlen = sizeof(*id);
2901         }
2902         len += userpolicy_type_attrsize();
2903         len += nla_total_size(sizeof(struct xfrm_mark));
2904         len += NLMSG_ALIGN(headlen);
2905 
2906         skb = nlmsg_new(len, GFP_ATOMIC);
2907         if (skb == NULL)
2908                 return -ENOMEM;
2909 
2910         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2911         err = -EMSGSIZE;
2912         if (nlh == NULL)
2913                 goto out_free_skb;
2914 
2915         p = nlmsg_data(nlh);
2916         if (c->event == XFRM_MSG_DELPOLICY) {
2917                 struct nlattr *attr;
2918 
2919                 id = nlmsg_data(nlh);
2920                 memset(id, 0, sizeof(*id));
2921                 id->dir = dir;
2922                 if (c->data.byid)
2923                         id->index = xp->index;
2924                 else
2925                         memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2926 
2927                 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2928                 err = -EMSGSIZE;
2929                 if (attr == NULL)
2930                         goto out_free_skb;
2931 
2932                 p = nla_data(attr);
2933         }
2934 
2935         copy_to_user_policy(xp, p, dir);
2936         err = copy_to_user_tmpl(xp, skb);
2937         if (!err)
2938                 err = copy_to_user_policy_type(xp->type, skb);
2939         if (!err)
2940                 err = xfrm_mark_put(skb, &xp->mark);
2941         if (err)
2942                 goto out_free_skb;
2943 
2944         nlmsg_end(skb, nlh);
2945 
2946         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2947 
2948 out_free_skb:
2949         kfree_skb(skb);
2950         return err;
2951 }
2952 
2953 static int xfrm_notify_policy_flush(const struct km_event *c)
2954 {
2955         struct net *net = c->net;
2956         struct nlmsghdr *nlh;
2957         struct sk_buff *skb;
2958         int err;
2959 
2960         skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2961         if (skb == NULL)
2962                 return -ENOMEM;
2963 
2964         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2965         err = -EMSGSIZE;
2966         if (nlh == NULL)
2967                 goto out_free_skb;
2968         err = copy_to_user_policy_type(c->data.type, skb);
2969         if (err)
2970                 goto out_free_skb;
2971 
2972         nlmsg_end(skb, nlh);
2973 
2974         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2975 
2976 out_free_skb:
2977         kfree_skb(skb);
2978         return err;
2979 }
2980 
2981 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2982 {
2983 
2984         switch (c->event) {
2985         case XFRM_MSG_NEWPOLICY:
2986         case XFRM_MSG_UPDPOLICY:
2987         case XFRM_MSG_DELPOLICY:
2988                 return xfrm_notify_policy(xp, dir, c);
2989         case XFRM_MSG_FLUSHPOLICY:
2990                 return xfrm_notify_policy_flush(c);
2991         case XFRM_MSG_POLEXPIRE:
2992                 return xfrm_exp_policy_notify(xp, dir, c);
2993         default:
2994                 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2995                        c->event);
2996         }
2997 
2998         return 0;
2999 
3000 }
3001 
3002 static inline size_t xfrm_report_msgsize(void)
3003 {
3004         return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3005 }
3006 
3007 static int build_report(struct sk_buff *skb, u8 proto,
3008                         struct xfrm_selector *sel, xfrm_address_t *addr)
3009 {
3010         struct xfrm_user_report *ur;
3011         struct nlmsghdr *nlh;
3012 
3013         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3014         if (nlh == NULL)
3015                 return -EMSGSIZE;
3016 
3017         ur = nlmsg_data(nlh);
3018         ur->proto = proto;
3019         memcpy(&ur->sel, sel, sizeof(ur->sel));
3020 
3021         if (addr) {
3022                 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3023                 if (err) {
3024                         nlmsg_cancel(skb, nlh);
3025                         return err;
3026                 }
3027         }
3028         nlmsg_end(skb, nlh);
3029         return 0;
3030 }
3031 
3032 static int xfrm_send_report(struct net *net, u8 proto,
3033                             struct xfrm_selector *sel, xfrm_address_t *addr)
3034 {
3035         struct sk_buff *skb;
3036 
3037         skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3038         if (skb == NULL)
3039                 return -ENOMEM;
3040 
3041         if (build_report(skb, proto, sel, addr) < 0)
3042                 BUG();
3043 
3044         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3045 }
3046 
3047 static inline size_t xfrm_mapping_msgsize(void)
3048 {
3049         return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3050 }
3051 
3052 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3053                          xfrm_address_t *new_saddr, __be16 new_sport)
3054 {
3055         struct xfrm_user_mapping *um;
3056         struct nlmsghdr *nlh;
3057 
3058         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3059         if (nlh == NULL)
3060                 return -EMSGSIZE;
3061 
3062         um = nlmsg_data(nlh);
3063 
3064         memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3065         um->id.spi = x->id.spi;
3066         um->id.family = x->props.family;
3067         um->id.proto = x->id.proto;
3068         memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3069         memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3070         um->new_sport = new_sport;
3071         um->old_sport = x->encap->encap_sport;
3072         um->reqid = x->props.reqid;
3073 
3074         nlmsg_end(skb, nlh);
3075         return 0;
3076 }
3077 
3078 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3079                              __be16 sport)
3080 {
3081         struct net *net = xs_net(x);
3082         struct sk_buff *skb;
3083 
3084         if (x->id.proto != IPPROTO_ESP)
3085                 return -EINVAL;
3086 
3087         if (!x->encap)
3088                 return -EINVAL;
3089 
3090         skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3091         if (skb == NULL)
3092                 return -ENOMEM;
3093 
3094         if (build_mapping(skb, x, ipaddr, sport) < 0)
3095                 BUG();
3096 
3097         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3098 }
3099 
3100 static bool xfrm_is_alive(const struct km_event *c)
3101 {
3102         return (bool)xfrm_acquire_is_on(c->net);
3103 }
3104 
3105 static struct xfrm_mgr netlink_mgr = {
3106         .id             = "netlink",
3107         .notify         = xfrm_send_state_notify,
3108         .acquire        = xfrm_send_acquire,
3109         .compile_policy = xfrm_compile_policy,
3110         .notify_policy  = xfrm_send_policy_notify,
3111         .report         = xfrm_send_report,
3112         .migrate        = xfrm_send_migrate,
3113         .new_mapping    = xfrm_send_mapping,
3114         .is_alive       = xfrm_is_alive,
3115 };
3116 
3117 static int __net_init xfrm_user_net_init(struct net *net)
3118 {
3119         struct sock *nlsk;
3120         struct netlink_kernel_cfg cfg = {
3121                 .groups = XFRMNLGRP_MAX,
3122                 .input  = xfrm_netlink_rcv,
3123         };
3124 
3125         nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3126         if (nlsk == NULL)
3127                 return -ENOMEM;
3128         net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3129         rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3130         return 0;
3131 }
3132 
3133 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3134 {
3135         struct net *net;
3136         list_for_each_entry(net, net_exit_list, exit_list)
3137                 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3138         synchronize_net();
3139         list_for_each_entry(net, net_exit_list, exit_list)
3140                 netlink_kernel_release(net->xfrm.nlsk_stash);
3141 }
3142 
3143 static struct pernet_operations xfrm_user_net_ops = {
3144         .init       = xfrm_user_net_init,
3145         .exit_batch = xfrm_user_net_exit,
3146 };
3147 
3148 static int __init xfrm_user_init(void)
3149 {
3150         int rv;
3151 
3152         printk(KERN_INFO "Initializing XFRM netlink socket\n");
3153 
3154         rv = register_pernet_subsys(&xfrm_user_net_ops);
3155         if (rv < 0)
3156                 return rv;
3157         rv = xfrm_register_km(&netlink_mgr);
3158         if (rv < 0)
3159                 unregister_pernet_subsys(&xfrm_user_net_ops);
3160         return rv;
3161 }
3162 
3163 static void __exit xfrm_user_exit(void)
3164 {
3165         xfrm_unregister_km(&netlink_mgr);
3166         unregister_pernet_subsys(&xfrm_user_net_ops);
3167 }
3168 
3169 module_init(xfrm_user_init);
3170 module_exit(xfrm_user_exit);
3171 MODULE_LICENSE("GPL");
3172 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3173 
3174 

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