Version:  2.0.40 2.2.26 2.4.37 3.9 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

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(skb, XFRMA_LASTUSED, x->lastused);
813                 if (ret)
814                         goto out;
815         }
816         if (x->aead) {
817                 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
818                 if (ret)
819                         goto out;
820         }
821         if (x->aalg) {
822                 ret = copy_to_user_auth(x->aalg, skb);
823                 if (!ret)
824                         ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
825                                       xfrm_alg_auth_len(x->aalg), x->aalg);
826                 if (ret)
827                         goto out;
828         }
829         if (x->ealg) {
830                 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
831                 if (ret)
832                         goto out;
833         }
834         if (x->calg) {
835                 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
836                 if (ret)
837                         goto out;
838         }
839         if (x->encap) {
840                 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
841                 if (ret)
842                         goto out;
843         }
844         if (x->tfcpad) {
845                 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
846                 if (ret)
847                         goto out;
848         }
849         ret = xfrm_mark_put(skb, &x->mark);
850         if (ret)
851                 goto out;
852         if (x->replay_esn)
853                 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
854                               xfrm_replay_state_esn_len(x->replay_esn),
855                               x->replay_esn);
856         else
857                 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
858                               &x->replay);
859         if (ret)
860                 goto out;
861         if (x->security)
862                 ret = copy_sec_ctx(x->security, skb);
863 out:
864         return ret;
865 }
866 
867 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
868 {
869         struct xfrm_dump_info *sp = ptr;
870         struct sk_buff *in_skb = sp->in_skb;
871         struct sk_buff *skb = sp->out_skb;
872         struct xfrm_usersa_info *p;
873         struct nlmsghdr *nlh;
874         int err;
875 
876         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
877                         XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
878         if (nlh == NULL)
879                 return -EMSGSIZE;
880 
881         p = nlmsg_data(nlh);
882 
883         err = copy_to_user_state_extra(x, p, skb);
884         if (err) {
885                 nlmsg_cancel(skb, nlh);
886                 return err;
887         }
888         nlmsg_end(skb, nlh);
889         return 0;
890 }
891 
892 static int xfrm_dump_sa_done(struct netlink_callback *cb)
893 {
894         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
895         struct sock *sk = cb->skb->sk;
896         struct net *net = sock_net(sk);
897 
898         xfrm_state_walk_done(walk, net);
899         return 0;
900 }
901 
902 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
903 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
904 {
905         struct net *net = sock_net(skb->sk);
906         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
907         struct xfrm_dump_info info;
908 
909         BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
910                      sizeof(cb->args) - sizeof(cb->args[0]));
911 
912         info.in_skb = cb->skb;
913         info.out_skb = skb;
914         info.nlmsg_seq = cb->nlh->nlmsg_seq;
915         info.nlmsg_flags = NLM_F_MULTI;
916 
917         if (!cb->args[0]) {
918                 struct nlattr *attrs[XFRMA_MAX+1];
919                 struct xfrm_address_filter *filter = NULL;
920                 u8 proto = 0;
921                 int err;
922 
923                 cb->args[0] = 1;
924 
925                 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
926                                   xfrma_policy);
927                 if (err < 0)
928                         return err;
929 
930                 if (attrs[XFRMA_ADDRESS_FILTER]) {
931                         filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
932                                          sizeof(*filter), GFP_KERNEL);
933                         if (filter == NULL)
934                                 return -ENOMEM;
935                 }
936 
937                 if (attrs[XFRMA_PROTO])
938                         proto = nla_get_u8(attrs[XFRMA_PROTO]);
939 
940                 xfrm_state_walk_init(walk, proto, filter);
941         }
942 
943         (void) xfrm_state_walk(net, walk, dump_one_state, &info);
944 
945         return skb->len;
946 }
947 
948 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
949                                           struct xfrm_state *x, u32 seq)
950 {
951         struct xfrm_dump_info info;
952         struct sk_buff *skb;
953         int err;
954 
955         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
956         if (!skb)
957                 return ERR_PTR(-ENOMEM);
958 
959         info.in_skb = in_skb;
960         info.out_skb = skb;
961         info.nlmsg_seq = seq;
962         info.nlmsg_flags = 0;
963 
964         err = dump_one_state(x, 0, &info);
965         if (err) {
966                 kfree_skb(skb);
967                 return ERR_PTR(err);
968         }
969 
970         return skb;
971 }
972 
973 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
974  * Must be called with RCU read lock.
975  */
976 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
977                                        u32 pid, unsigned int group)
978 {
979         struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
980 
981         if (nlsk)
982                 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
983         else
984                 return -1;
985 }
986 
987 static inline size_t xfrm_spdinfo_msgsize(void)
988 {
989         return NLMSG_ALIGN(4)
990                + nla_total_size(sizeof(struct xfrmu_spdinfo))
991                + nla_total_size(sizeof(struct xfrmu_spdhinfo))
992                + nla_total_size(sizeof(struct xfrmu_spdhthresh))
993                + nla_total_size(sizeof(struct xfrmu_spdhthresh));
994 }
995 
996 static int build_spdinfo(struct sk_buff *skb, struct net *net,
997                          u32 portid, u32 seq, u32 flags)
998 {
999         struct xfrmk_spdinfo si;
1000         struct xfrmu_spdinfo spc;
1001         struct xfrmu_spdhinfo sph;
1002         struct xfrmu_spdhthresh spt4, spt6;
1003         struct nlmsghdr *nlh;
1004         int err;
1005         u32 *f;
1006         unsigned lseq;
1007 
1008         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1009         if (nlh == NULL) /* shouldn't really happen ... */
1010                 return -EMSGSIZE;
1011 
1012         f = nlmsg_data(nlh);
1013         *f = flags;
1014         xfrm_spd_getinfo(net, &si);
1015         spc.incnt = si.incnt;
1016         spc.outcnt = si.outcnt;
1017         spc.fwdcnt = si.fwdcnt;
1018         spc.inscnt = si.inscnt;
1019         spc.outscnt = si.outscnt;
1020         spc.fwdscnt = si.fwdscnt;
1021         sph.spdhcnt = si.spdhcnt;
1022         sph.spdhmcnt = si.spdhmcnt;
1023 
1024         do {
1025                 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1026 
1027                 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1028                 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1029                 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1030                 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1031         } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1032 
1033         err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1034         if (!err)
1035                 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1036         if (!err)
1037                 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1038         if (!err)
1039                 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1040         if (err) {
1041                 nlmsg_cancel(skb, nlh);
1042                 return err;
1043         }
1044 
1045         nlmsg_end(skb, nlh);
1046         return 0;
1047 }
1048 
1049 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1050                             struct nlattr **attrs)
1051 {
1052         struct net *net = sock_net(skb->sk);
1053         struct xfrmu_spdhthresh *thresh4 = NULL;
1054         struct xfrmu_spdhthresh *thresh6 = NULL;
1055 
1056         /* selector prefixlen thresholds to hash policies */
1057         if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1058                 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1059 
1060                 if (nla_len(rta) < sizeof(*thresh4))
1061                         return -EINVAL;
1062                 thresh4 = nla_data(rta);
1063                 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1064                         return -EINVAL;
1065         }
1066         if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1067                 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1068 
1069                 if (nla_len(rta) < sizeof(*thresh6))
1070                         return -EINVAL;
1071                 thresh6 = nla_data(rta);
1072                 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1073                         return -EINVAL;
1074         }
1075 
1076         if (thresh4 || thresh6) {
1077                 write_seqlock(&net->xfrm.policy_hthresh.lock);
1078                 if (thresh4) {
1079                         net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1080                         net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1081                 }
1082                 if (thresh6) {
1083                         net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1084                         net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1085                 }
1086                 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1087 
1088                 xfrm_policy_hash_rebuild(net);
1089         }
1090 
1091         return 0;
1092 }
1093 
1094 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1095                 struct nlattr **attrs)
1096 {
1097         struct net *net = sock_net(skb->sk);
1098         struct sk_buff *r_skb;
1099         u32 *flags = nlmsg_data(nlh);
1100         u32 sportid = NETLINK_CB(skb).portid;
1101         u32 seq = nlh->nlmsg_seq;
1102 
1103         r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1104         if (r_skb == NULL)
1105                 return -ENOMEM;
1106 
1107         if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1108                 BUG();
1109 
1110         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1111 }
1112 
1113 static inline size_t xfrm_sadinfo_msgsize(void)
1114 {
1115         return NLMSG_ALIGN(4)
1116                + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1117                + nla_total_size(4); /* XFRMA_SAD_CNT */
1118 }
1119 
1120 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1121                          u32 portid, u32 seq, u32 flags)
1122 {
1123         struct xfrmk_sadinfo si;
1124         struct xfrmu_sadhinfo sh;
1125         struct nlmsghdr *nlh;
1126         int err;
1127         u32 *f;
1128 
1129         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1130         if (nlh == NULL) /* shouldn't really happen ... */
1131                 return -EMSGSIZE;
1132 
1133         f = nlmsg_data(nlh);
1134         *f = flags;
1135         xfrm_sad_getinfo(net, &si);
1136 
1137         sh.sadhmcnt = si.sadhmcnt;
1138         sh.sadhcnt = si.sadhcnt;
1139 
1140         err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1141         if (!err)
1142                 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1143         if (err) {
1144                 nlmsg_cancel(skb, nlh);
1145                 return err;
1146         }
1147 
1148         nlmsg_end(skb, nlh);
1149         return 0;
1150 }
1151 
1152 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1153                 struct nlattr **attrs)
1154 {
1155         struct net *net = sock_net(skb->sk);
1156         struct sk_buff *r_skb;
1157         u32 *flags = nlmsg_data(nlh);
1158         u32 sportid = NETLINK_CB(skb).portid;
1159         u32 seq = nlh->nlmsg_seq;
1160 
1161         r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1162         if (r_skb == NULL)
1163                 return -ENOMEM;
1164 
1165         if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1166                 BUG();
1167 
1168         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1169 }
1170 
1171 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1172                 struct nlattr **attrs)
1173 {
1174         struct net *net = sock_net(skb->sk);
1175         struct xfrm_usersa_id *p = nlmsg_data(nlh);
1176         struct xfrm_state *x;
1177         struct sk_buff *resp_skb;
1178         int err = -ESRCH;
1179 
1180         x = xfrm_user_state_lookup(net, p, attrs, &err);
1181         if (x == NULL)
1182                 goto out_noput;
1183 
1184         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1185         if (IS_ERR(resp_skb)) {
1186                 err = PTR_ERR(resp_skb);
1187         } else {
1188                 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1189         }
1190         xfrm_state_put(x);
1191 out_noput:
1192         return err;
1193 }
1194 
1195 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1196                 struct nlattr **attrs)
1197 {
1198         struct net *net = sock_net(skb->sk);
1199         struct xfrm_state *x;
1200         struct xfrm_userspi_info *p;
1201         struct sk_buff *resp_skb;
1202         xfrm_address_t *daddr;
1203         int family;
1204         int err;
1205         u32 mark;
1206         struct xfrm_mark m;
1207 
1208         p = nlmsg_data(nlh);
1209         err = verify_spi_info(p->info.id.proto, p->min, p->max);
1210         if (err)
1211                 goto out_noput;
1212 
1213         family = p->info.family;
1214         daddr = &p->info.id.daddr;
1215 
1216         x = NULL;
1217 
1218         mark = xfrm_mark_get(attrs, &m);
1219         if (p->info.seq) {
1220                 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1221                 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1222                         xfrm_state_put(x);
1223                         x = NULL;
1224                 }
1225         }
1226 
1227         if (!x)
1228                 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1229                                   p->info.id.proto, daddr,
1230                                   &p->info.saddr, 1,
1231                                   family);
1232         err = -ENOENT;
1233         if (x == NULL)
1234                 goto out_noput;
1235 
1236         err = xfrm_alloc_spi(x, p->min, p->max);
1237         if (err)
1238                 goto out;
1239 
1240         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1241         if (IS_ERR(resp_skb)) {
1242                 err = PTR_ERR(resp_skb);
1243                 goto out;
1244         }
1245 
1246         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1247 
1248 out:
1249         xfrm_state_put(x);
1250 out_noput:
1251         return err;
1252 }
1253 
1254 static int verify_policy_dir(u8 dir)
1255 {
1256         switch (dir) {
1257         case XFRM_POLICY_IN:
1258         case XFRM_POLICY_OUT:
1259         case XFRM_POLICY_FWD:
1260                 break;
1261 
1262         default:
1263                 return -EINVAL;
1264         }
1265 
1266         return 0;
1267 }
1268 
1269 static int verify_policy_type(u8 type)
1270 {
1271         switch (type) {
1272         case XFRM_POLICY_TYPE_MAIN:
1273 #ifdef CONFIG_XFRM_SUB_POLICY
1274         case XFRM_POLICY_TYPE_SUB:
1275 #endif
1276                 break;
1277 
1278         default:
1279                 return -EINVAL;
1280         }
1281 
1282         return 0;
1283 }
1284 
1285 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1286 {
1287         int ret;
1288 
1289         switch (p->share) {
1290         case XFRM_SHARE_ANY:
1291         case XFRM_SHARE_SESSION:
1292         case XFRM_SHARE_USER:
1293         case XFRM_SHARE_UNIQUE:
1294                 break;
1295 
1296         default:
1297                 return -EINVAL;
1298         }
1299 
1300         switch (p->action) {
1301         case XFRM_POLICY_ALLOW:
1302         case XFRM_POLICY_BLOCK:
1303                 break;
1304 
1305         default:
1306                 return -EINVAL;
1307         }
1308 
1309         switch (p->sel.family) {
1310         case AF_INET:
1311                 break;
1312 
1313         case AF_INET6:
1314 #if IS_ENABLED(CONFIG_IPV6)
1315                 break;
1316 #else
1317                 return  -EAFNOSUPPORT;
1318 #endif
1319 
1320         default:
1321                 return -EINVAL;
1322         }
1323 
1324         ret = verify_policy_dir(p->dir);
1325         if (ret)
1326                 return ret;
1327         if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1328                 return -EINVAL;
1329 
1330         return 0;
1331 }
1332 
1333 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1334 {
1335         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1336         struct xfrm_user_sec_ctx *uctx;
1337 
1338         if (!rt)
1339                 return 0;
1340 
1341         uctx = nla_data(rt);
1342         return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1343 }
1344 
1345 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1346                            int nr)
1347 {
1348         int i;
1349 
1350         xp->xfrm_nr = nr;
1351         for (i = 0; i < nr; i++, ut++) {
1352                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1353 
1354                 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1355                 memcpy(&t->saddr, &ut->saddr,
1356                        sizeof(xfrm_address_t));
1357                 t->reqid = ut->reqid;
1358                 t->mode = ut->mode;
1359                 t->share = ut->share;
1360                 t->optional = ut->optional;
1361                 t->aalgos = ut->aalgos;
1362                 t->ealgos = ut->ealgos;
1363                 t->calgos = ut->calgos;
1364                 /* If all masks are ~0, then we allow all algorithms. */
1365                 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1366                 t->encap_family = ut->family;
1367         }
1368 }
1369 
1370 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1371 {
1372         int i;
1373 
1374         if (nr > XFRM_MAX_DEPTH)
1375                 return -EINVAL;
1376 
1377         for (i = 0; i < nr; i++) {
1378                 /* We never validated the ut->family value, so many
1379                  * applications simply leave it at zero.  The check was
1380                  * never made and ut->family was ignored because all
1381                  * templates could be assumed to have the same family as
1382                  * the policy itself.  Now that we will have ipv4-in-ipv6
1383                  * and ipv6-in-ipv4 tunnels, this is no longer true.
1384                  */
1385                 if (!ut[i].family)
1386                         ut[i].family = family;
1387 
1388                 switch (ut[i].family) {
1389                 case AF_INET:
1390                         break;
1391 #if IS_ENABLED(CONFIG_IPV6)
1392                 case AF_INET6:
1393                         break;
1394 #endif
1395                 default:
1396                         return -EINVAL;
1397                 }
1398         }
1399 
1400         return 0;
1401 }
1402 
1403 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1404 {
1405         struct nlattr *rt = attrs[XFRMA_TMPL];
1406 
1407         if (!rt) {
1408                 pol->xfrm_nr = 0;
1409         } else {
1410                 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1411                 int nr = nla_len(rt) / sizeof(*utmpl);
1412                 int err;
1413 
1414                 err = validate_tmpl(nr, utmpl, pol->family);
1415                 if (err)
1416                         return err;
1417 
1418                 copy_templates(pol, utmpl, nr);
1419         }
1420         return 0;
1421 }
1422 
1423 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1424 {
1425         struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1426         struct xfrm_userpolicy_type *upt;
1427         u8 type = XFRM_POLICY_TYPE_MAIN;
1428         int err;
1429 
1430         if (rt) {
1431                 upt = nla_data(rt);
1432                 type = upt->type;
1433         }
1434 
1435         err = verify_policy_type(type);
1436         if (err)
1437                 return err;
1438 
1439         *tp = type;
1440         return 0;
1441 }
1442 
1443 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1444 {
1445         xp->priority = p->priority;
1446         xp->index = p->index;
1447         memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1448         memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1449         xp->action = p->action;
1450         xp->flags = p->flags;
1451         xp->family = p->sel.family;
1452         /* XXX xp->share = p->share; */
1453 }
1454 
1455 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1456 {
1457         memset(p, 0, sizeof(*p));
1458         memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1459         memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1460         memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1461         p->priority = xp->priority;
1462         p->index = xp->index;
1463         p->sel.family = xp->family;
1464         p->dir = dir;
1465         p->action = xp->action;
1466         p->flags = xp->flags;
1467         p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1468 }
1469 
1470 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1471 {
1472         struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1473         int err;
1474 
1475         if (!xp) {
1476                 *errp = -ENOMEM;
1477                 return NULL;
1478         }
1479 
1480         copy_from_user_policy(xp, p);
1481 
1482         err = copy_from_user_policy_type(&xp->type, attrs);
1483         if (err)
1484                 goto error;
1485 
1486         if (!(err = copy_from_user_tmpl(xp, attrs)))
1487                 err = copy_from_user_sec_ctx(xp, attrs);
1488         if (err)
1489                 goto error;
1490 
1491         xfrm_mark_get(attrs, &xp->mark);
1492 
1493         return xp;
1494  error:
1495         *errp = err;
1496         xp->walk.dead = 1;
1497         xfrm_policy_destroy(xp);
1498         return NULL;
1499 }
1500 
1501 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1502                 struct nlattr **attrs)
1503 {
1504         struct net *net = sock_net(skb->sk);
1505         struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1506         struct xfrm_policy *xp;
1507         struct km_event c;
1508         int err;
1509         int excl;
1510 
1511         err = verify_newpolicy_info(p);
1512         if (err)
1513                 return err;
1514         err = verify_sec_ctx_len(attrs);
1515         if (err)
1516                 return err;
1517 
1518         xp = xfrm_policy_construct(net, p, attrs, &err);
1519         if (!xp)
1520                 return err;
1521 
1522         /* shouldn't excl be based on nlh flags??
1523          * Aha! this is anti-netlink really i.e  more pfkey derived
1524          * in netlink excl is a flag and you wouldnt need
1525          * a type XFRM_MSG_UPDPOLICY - JHS */
1526         excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1527         err = xfrm_policy_insert(p->dir, xp, excl);
1528         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1529 
1530         if (err) {
1531                 security_xfrm_policy_free(xp->security);
1532                 kfree(xp);
1533                 return err;
1534         }
1535 
1536         c.event = nlh->nlmsg_type;
1537         c.seq = nlh->nlmsg_seq;
1538         c.portid = nlh->nlmsg_pid;
1539         km_policy_notify(xp, p->dir, &c);
1540 
1541         xfrm_pol_put(xp);
1542 
1543         return 0;
1544 }
1545 
1546 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1547 {
1548         struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1549         int i;
1550 
1551         if (xp->xfrm_nr == 0)
1552                 return 0;
1553 
1554         for (i = 0; i < xp->xfrm_nr; i++) {
1555                 struct xfrm_user_tmpl *up = &vec[i];
1556                 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1557 
1558                 memset(up, 0, sizeof(*up));
1559                 memcpy(&up->id, &kp->id, sizeof(up->id));
1560                 up->family = kp->encap_family;
1561                 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1562                 up->reqid = kp->reqid;
1563                 up->mode = kp->mode;
1564                 up->share = kp->share;
1565                 up->optional = kp->optional;
1566                 up->aalgos = kp->aalgos;
1567                 up->ealgos = kp->ealgos;
1568                 up->calgos = kp->calgos;
1569         }
1570 
1571         return nla_put(skb, XFRMA_TMPL,
1572                        sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1573 }
1574 
1575 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1576 {
1577         if (x->security) {
1578                 return copy_sec_ctx(x->security, skb);
1579         }
1580         return 0;
1581 }
1582 
1583 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1584 {
1585         if (xp->security)
1586                 return copy_sec_ctx(xp->security, skb);
1587         return 0;
1588 }
1589 static inline size_t userpolicy_type_attrsize(void)
1590 {
1591 #ifdef CONFIG_XFRM_SUB_POLICY
1592         return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1593 #else
1594         return 0;
1595 #endif
1596 }
1597 
1598 #ifdef CONFIG_XFRM_SUB_POLICY
1599 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1600 {
1601         struct xfrm_userpolicy_type upt = {
1602                 .type = type,
1603         };
1604 
1605         return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1606 }
1607 
1608 #else
1609 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1610 {
1611         return 0;
1612 }
1613 #endif
1614 
1615 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1616 {
1617         struct xfrm_dump_info *sp = ptr;
1618         struct xfrm_userpolicy_info *p;
1619         struct sk_buff *in_skb = sp->in_skb;
1620         struct sk_buff *skb = sp->out_skb;
1621         struct nlmsghdr *nlh;
1622         int err;
1623 
1624         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1625                         XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1626         if (nlh == NULL)
1627                 return -EMSGSIZE;
1628 
1629         p = nlmsg_data(nlh);
1630         copy_to_user_policy(xp, p, dir);
1631         err = copy_to_user_tmpl(xp, skb);
1632         if (!err)
1633                 err = copy_to_user_sec_ctx(xp, skb);
1634         if (!err)
1635                 err = copy_to_user_policy_type(xp->type, skb);
1636         if (!err)
1637                 err = xfrm_mark_put(skb, &xp->mark);
1638         if (err) {
1639                 nlmsg_cancel(skb, nlh);
1640                 return err;
1641         }
1642         nlmsg_end(skb, nlh);
1643         return 0;
1644 }
1645 
1646 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1647 {
1648         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1649         struct net *net = sock_net(cb->skb->sk);
1650 
1651         xfrm_policy_walk_done(walk, net);
1652         return 0;
1653 }
1654 
1655 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1656 {
1657         struct net *net = sock_net(skb->sk);
1658         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1659         struct xfrm_dump_info info;
1660 
1661         BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1662                      sizeof(cb->args) - sizeof(cb->args[0]));
1663 
1664         info.in_skb = cb->skb;
1665         info.out_skb = skb;
1666         info.nlmsg_seq = cb->nlh->nlmsg_seq;
1667         info.nlmsg_flags = NLM_F_MULTI;
1668 
1669         if (!cb->args[0]) {
1670                 cb->args[0] = 1;
1671                 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1672         }
1673 
1674         (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1675 
1676         return skb->len;
1677 }
1678 
1679 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1680                                           struct xfrm_policy *xp,
1681                                           int dir, u32 seq)
1682 {
1683         struct xfrm_dump_info info;
1684         struct sk_buff *skb;
1685         int err;
1686 
1687         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1688         if (!skb)
1689                 return ERR_PTR(-ENOMEM);
1690 
1691         info.in_skb = in_skb;
1692         info.out_skb = skb;
1693         info.nlmsg_seq = seq;
1694         info.nlmsg_flags = 0;
1695 
1696         err = dump_one_policy(xp, dir, 0, &info);
1697         if (err) {
1698                 kfree_skb(skb);
1699                 return ERR_PTR(err);
1700         }
1701 
1702         return skb;
1703 }
1704 
1705 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1706                 struct nlattr **attrs)
1707 {
1708         struct net *net = sock_net(skb->sk);
1709         struct xfrm_policy *xp;
1710         struct xfrm_userpolicy_id *p;
1711         u8 type = XFRM_POLICY_TYPE_MAIN;
1712         int err;
1713         struct km_event c;
1714         int delete;
1715         struct xfrm_mark m;
1716         u32 mark = xfrm_mark_get(attrs, &m);
1717 
1718         p = nlmsg_data(nlh);
1719         delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1720 
1721         err = copy_from_user_policy_type(&type, attrs);
1722         if (err)
1723                 return err;
1724 
1725         err = verify_policy_dir(p->dir);
1726         if (err)
1727                 return err;
1728 
1729         if (p->index)
1730                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1731         else {
1732                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1733                 struct xfrm_sec_ctx *ctx;
1734 
1735                 err = verify_sec_ctx_len(attrs);
1736                 if (err)
1737                         return err;
1738 
1739                 ctx = NULL;
1740                 if (rt) {
1741                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1742 
1743                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1744                         if (err)
1745                                 return err;
1746                 }
1747                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1748                                            ctx, delete, &err);
1749                 security_xfrm_policy_free(ctx);
1750         }
1751         if (xp == NULL)
1752                 return -ENOENT;
1753 
1754         if (!delete) {
1755                 struct sk_buff *resp_skb;
1756 
1757                 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1758                 if (IS_ERR(resp_skb)) {
1759                         err = PTR_ERR(resp_skb);
1760                 } else {
1761                         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1762                                             NETLINK_CB(skb).portid);
1763                 }
1764         } else {
1765                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1766 
1767                 if (err != 0)
1768                         goto out;
1769 
1770                 c.data.byid = p->index;
1771                 c.event = nlh->nlmsg_type;
1772                 c.seq = nlh->nlmsg_seq;
1773                 c.portid = nlh->nlmsg_pid;
1774                 km_policy_notify(xp, p->dir, &c);
1775         }
1776 
1777 out:
1778         xfrm_pol_put(xp);
1779         if (delete && err == 0)
1780                 xfrm_garbage_collect(net);
1781         return err;
1782 }
1783 
1784 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1785                 struct nlattr **attrs)
1786 {
1787         struct net *net = sock_net(skb->sk);
1788         struct km_event c;
1789         struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1790         int err;
1791 
1792         err = xfrm_state_flush(net, p->proto, true);
1793         if (err) {
1794                 if (err == -ESRCH) /* empty table */
1795                         return 0;
1796                 return err;
1797         }
1798         c.data.proto = p->proto;
1799         c.event = nlh->nlmsg_type;
1800         c.seq = nlh->nlmsg_seq;
1801         c.portid = nlh->nlmsg_pid;
1802         c.net = net;
1803         km_state_notify(NULL, &c);
1804 
1805         return 0;
1806 }
1807 
1808 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1809 {
1810         size_t replay_size = x->replay_esn ?
1811                               xfrm_replay_state_esn_len(x->replay_esn) :
1812                               sizeof(struct xfrm_replay_state);
1813 
1814         return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1815                + nla_total_size(replay_size)
1816                + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1817                + nla_total_size(sizeof(struct xfrm_mark))
1818                + nla_total_size(4) /* XFRM_AE_RTHR */
1819                + nla_total_size(4); /* XFRM_AE_ETHR */
1820 }
1821 
1822 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1823 {
1824         struct xfrm_aevent_id *id;
1825         struct nlmsghdr *nlh;
1826         int err;
1827 
1828         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1829         if (nlh == NULL)
1830                 return -EMSGSIZE;
1831 
1832         id = nlmsg_data(nlh);
1833         memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1834         id->sa_id.spi = x->id.spi;
1835         id->sa_id.family = x->props.family;
1836         id->sa_id.proto = x->id.proto;
1837         memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1838         id->reqid = x->props.reqid;
1839         id->flags = c->data.aevent;
1840 
1841         if (x->replay_esn) {
1842                 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1843                               xfrm_replay_state_esn_len(x->replay_esn),
1844                               x->replay_esn);
1845         } else {
1846                 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1847                               &x->replay);
1848         }
1849         if (err)
1850                 goto out_cancel;
1851         err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1852         if (err)
1853                 goto out_cancel;
1854 
1855         if (id->flags & XFRM_AE_RTHR) {
1856                 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1857                 if (err)
1858                         goto out_cancel;
1859         }
1860         if (id->flags & XFRM_AE_ETHR) {
1861                 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1862                                   x->replay_maxage * 10 / HZ);
1863                 if (err)
1864                         goto out_cancel;
1865         }
1866         err = xfrm_mark_put(skb, &x->mark);
1867         if (err)
1868                 goto out_cancel;
1869 
1870         nlmsg_end(skb, nlh);
1871         return 0;
1872 
1873 out_cancel:
1874         nlmsg_cancel(skb, nlh);
1875         return err;
1876 }
1877 
1878 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1879                 struct nlattr **attrs)
1880 {
1881         struct net *net = sock_net(skb->sk);
1882         struct xfrm_state *x;
1883         struct sk_buff *r_skb;
1884         int err;
1885         struct km_event c;
1886         u32 mark;
1887         struct xfrm_mark m;
1888         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1889         struct xfrm_usersa_id *id = &p->sa_id;
1890 
1891         mark = xfrm_mark_get(attrs, &m);
1892 
1893         x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1894         if (x == NULL)
1895                 return -ESRCH;
1896 
1897         r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1898         if (r_skb == NULL) {
1899                 xfrm_state_put(x);
1900                 return -ENOMEM;
1901         }
1902 
1903         /*
1904          * XXX: is this lock really needed - none of the other
1905          * gets lock (the concern is things getting updated
1906          * while we are still reading) - jhs
1907         */
1908         spin_lock_bh(&x->lock);
1909         c.data.aevent = p->flags;
1910         c.seq = nlh->nlmsg_seq;
1911         c.portid = nlh->nlmsg_pid;
1912 
1913         if (build_aevent(r_skb, x, &c) < 0)
1914                 BUG();
1915         err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1916         spin_unlock_bh(&x->lock);
1917         xfrm_state_put(x);
1918         return err;
1919 }
1920 
1921 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1922                 struct nlattr **attrs)
1923 {
1924         struct net *net = sock_net(skb->sk);
1925         struct xfrm_state *x;
1926         struct km_event c;
1927         int err = -EINVAL;
1928         u32 mark = 0;
1929         struct xfrm_mark m;
1930         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1931         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1932         struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1933         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1934         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1935         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
1936 
1937         if (!lt && !rp && !re && !et && !rt)
1938                 return err;
1939 
1940         /* pedantic mode - thou shalt sayeth replaceth */
1941         if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1942                 return err;
1943 
1944         mark = xfrm_mark_get(attrs, &m);
1945 
1946         x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1947         if (x == NULL)
1948                 return -ESRCH;
1949 
1950         if (x->km.state != XFRM_STATE_VALID)
1951                 goto out;
1952 
1953         err = xfrm_replay_verify_len(x->replay_esn, re);
1954         if (err)
1955                 goto out;
1956 
1957         spin_lock_bh(&x->lock);
1958         xfrm_update_ae_params(x, attrs, 1);
1959         spin_unlock_bh(&x->lock);
1960 
1961         c.event = nlh->nlmsg_type;
1962         c.seq = nlh->nlmsg_seq;
1963         c.portid = nlh->nlmsg_pid;
1964         c.data.aevent = XFRM_AE_CU;
1965         km_state_notify(x, &c);
1966         err = 0;
1967 out:
1968         xfrm_state_put(x);
1969         return err;
1970 }
1971 
1972 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1973                 struct nlattr **attrs)
1974 {
1975         struct net *net = sock_net(skb->sk);
1976         struct km_event c;
1977         u8 type = XFRM_POLICY_TYPE_MAIN;
1978         int err;
1979 
1980         err = copy_from_user_policy_type(&type, attrs);
1981         if (err)
1982                 return err;
1983 
1984         err = xfrm_policy_flush(net, type, true);
1985         if (err) {
1986                 if (err == -ESRCH) /* empty table */
1987                         return 0;
1988                 return err;
1989         }
1990 
1991         c.data.type = type;
1992         c.event = nlh->nlmsg_type;
1993         c.seq = nlh->nlmsg_seq;
1994         c.portid = nlh->nlmsg_pid;
1995         c.net = net;
1996         km_policy_notify(NULL, 0, &c);
1997         return 0;
1998 }
1999 
2000 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2001                 struct nlattr **attrs)
2002 {
2003         struct net *net = sock_net(skb->sk);
2004         struct xfrm_policy *xp;
2005         struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2006         struct xfrm_userpolicy_info *p = &up->pol;
2007         u8 type = XFRM_POLICY_TYPE_MAIN;
2008         int err = -ENOENT;
2009         struct xfrm_mark m;
2010         u32 mark = xfrm_mark_get(attrs, &m);
2011 
2012         err = copy_from_user_policy_type(&type, attrs);
2013         if (err)
2014                 return err;
2015 
2016         err = verify_policy_dir(p->dir);
2017         if (err)
2018                 return err;
2019 
2020         if (p->index)
2021                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2022         else {
2023                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2024                 struct xfrm_sec_ctx *ctx;
2025 
2026                 err = verify_sec_ctx_len(attrs);
2027                 if (err)
2028                         return err;
2029 
2030                 ctx = NULL;
2031                 if (rt) {
2032                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2033 
2034                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2035                         if (err)
2036                                 return err;
2037                 }
2038                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2039                                            &p->sel, ctx, 0, &err);
2040                 security_xfrm_policy_free(ctx);
2041         }
2042         if (xp == NULL)
2043                 return -ENOENT;
2044 
2045         if (unlikely(xp->walk.dead))
2046                 goto out;
2047 
2048         err = 0;
2049         if (up->hard) {
2050                 xfrm_policy_delete(xp, p->dir);
2051                 xfrm_audit_policy_delete(xp, 1, true);
2052         } else {
2053                 // reset the timers here?
2054                 WARN(1, "Don't know what to do with soft policy expire\n");
2055         }
2056         km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2057 
2058 out:
2059         xfrm_pol_put(xp);
2060         return err;
2061 }
2062 
2063 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2064                 struct nlattr **attrs)
2065 {
2066         struct net *net = sock_net(skb->sk);
2067         struct xfrm_state *x;
2068         int err;
2069         struct xfrm_user_expire *ue = nlmsg_data(nlh);
2070         struct xfrm_usersa_info *p = &ue->state;
2071         struct xfrm_mark m;
2072         u32 mark = xfrm_mark_get(attrs, &m);
2073 
2074         x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2075 
2076         err = -ENOENT;
2077         if (x == NULL)
2078                 return err;
2079 
2080         spin_lock_bh(&x->lock);
2081         err = -EINVAL;
2082         if (x->km.state != XFRM_STATE_VALID)
2083                 goto out;
2084         km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2085 
2086         if (ue->hard) {
2087                 __xfrm_state_delete(x);
2088                 xfrm_audit_state_delete(x, 1, true);
2089         }
2090         err = 0;
2091 out:
2092         spin_unlock_bh(&x->lock);
2093         xfrm_state_put(x);
2094         return err;
2095 }
2096 
2097 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2098                 struct nlattr **attrs)
2099 {
2100         struct net *net = sock_net(skb->sk);
2101         struct xfrm_policy *xp;
2102         struct xfrm_user_tmpl *ut;
2103         int i;
2104         struct nlattr *rt = attrs[XFRMA_TMPL];
2105         struct xfrm_mark mark;
2106 
2107         struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2108         struct xfrm_state *x = xfrm_state_alloc(net);
2109         int err = -ENOMEM;
2110 
2111         if (!x)
2112                 goto nomem;
2113 
2114         xfrm_mark_get(attrs, &mark);
2115 
2116         err = verify_newpolicy_info(&ua->policy);
2117         if (err)
2118                 goto bad_policy;
2119 
2120         /*   build an XP */
2121         xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2122         if (!xp)
2123                 goto free_state;
2124 
2125         memcpy(&x->id, &ua->id, sizeof(ua->id));
2126         memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2127         memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2128         xp->mark.m = x->mark.m = mark.m;
2129         xp->mark.v = x->mark.v = mark.v;
2130         ut = nla_data(rt);
2131         /* extract the templates and for each call km_key */
2132         for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2133                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2134                 memcpy(&x->id, &t->id, sizeof(x->id));
2135                 x->props.mode = t->mode;
2136                 x->props.reqid = t->reqid;
2137                 x->props.family = ut->family;
2138                 t->aalgos = ua->aalgos;
2139                 t->ealgos = ua->ealgos;
2140                 t->calgos = ua->calgos;
2141                 err = km_query(x, t, xp);
2142 
2143         }
2144 
2145         kfree(x);
2146         kfree(xp);
2147 
2148         return 0;
2149 
2150 bad_policy:
2151         WARN(1, "BAD policy passed\n");
2152 free_state:
2153         kfree(x);
2154 nomem:
2155         return err;
2156 }
2157 
2158 #ifdef CONFIG_XFRM_MIGRATE
2159 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2160                                   struct xfrm_kmaddress *k,
2161                                   struct nlattr **attrs, int *num)
2162 {
2163         struct nlattr *rt = attrs[XFRMA_MIGRATE];
2164         struct xfrm_user_migrate *um;
2165         int i, num_migrate;
2166 
2167         if (k != NULL) {
2168                 struct xfrm_user_kmaddress *uk;
2169 
2170                 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2171                 memcpy(&k->local, &uk->local, sizeof(k->local));
2172                 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2173                 k->family = uk->family;
2174                 k->reserved = uk->reserved;
2175         }
2176 
2177         um = nla_data(rt);
2178         num_migrate = nla_len(rt) / sizeof(*um);
2179 
2180         if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2181                 return -EINVAL;
2182 
2183         for (i = 0; i < num_migrate; i++, um++, ma++) {
2184                 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2185                 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2186                 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2187                 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2188 
2189                 ma->proto = um->proto;
2190                 ma->mode = um->mode;
2191                 ma->reqid = um->reqid;
2192 
2193                 ma->old_family = um->old_family;
2194                 ma->new_family = um->new_family;
2195         }
2196 
2197         *num = i;
2198         return 0;
2199 }
2200 
2201 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2202                            struct nlattr **attrs)
2203 {
2204         struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2205         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2206         struct xfrm_kmaddress km, *kmp;
2207         u8 type;
2208         int err;
2209         int n = 0;
2210         struct net *net = sock_net(skb->sk);
2211 
2212         if (attrs[XFRMA_MIGRATE] == NULL)
2213                 return -EINVAL;
2214 
2215         kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2216 
2217         err = copy_from_user_policy_type(&type, attrs);
2218         if (err)
2219                 return err;
2220 
2221         err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2222         if (err)
2223                 return err;
2224 
2225         if (!n)
2226                 return 0;
2227 
2228         xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2229 
2230         return 0;
2231 }
2232 #else
2233 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2234                            struct nlattr **attrs)
2235 {
2236         return -ENOPROTOOPT;
2237 }
2238 #endif
2239 
2240 #ifdef CONFIG_XFRM_MIGRATE
2241 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2242 {
2243         struct xfrm_user_migrate um;
2244 
2245         memset(&um, 0, sizeof(um));
2246         um.proto = m->proto;
2247         um.mode = m->mode;
2248         um.reqid = m->reqid;
2249         um.old_family = m->old_family;
2250         memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2251         memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2252         um.new_family = m->new_family;
2253         memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2254         memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2255 
2256         return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2257 }
2258 
2259 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2260 {
2261         struct xfrm_user_kmaddress uk;
2262 
2263         memset(&uk, 0, sizeof(uk));
2264         uk.family = k->family;
2265         uk.reserved = k->reserved;
2266         memcpy(&uk.local, &k->local, sizeof(uk.local));
2267         memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2268 
2269         return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2270 }
2271 
2272 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2273 {
2274         return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2275               + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2276               + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2277               + userpolicy_type_attrsize();
2278 }
2279 
2280 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2281                          int num_migrate, const struct xfrm_kmaddress *k,
2282                          const struct xfrm_selector *sel, u8 dir, u8 type)
2283 {
2284         const struct xfrm_migrate *mp;
2285         struct xfrm_userpolicy_id *pol_id;
2286         struct nlmsghdr *nlh;
2287         int i, err;
2288 
2289         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2290         if (nlh == NULL)
2291                 return -EMSGSIZE;
2292 
2293         pol_id = nlmsg_data(nlh);
2294         /* copy data from selector, dir, and type to the pol_id */
2295         memset(pol_id, 0, sizeof(*pol_id));
2296         memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2297         pol_id->dir = dir;
2298 
2299         if (k != NULL) {
2300                 err = copy_to_user_kmaddress(k, skb);
2301                 if (err)
2302                         goto out_cancel;
2303         }
2304         err = copy_to_user_policy_type(type, skb);
2305         if (err)
2306                 goto out_cancel;
2307         for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2308                 err = copy_to_user_migrate(mp, skb);
2309                 if (err)
2310                         goto out_cancel;
2311         }
2312 
2313         nlmsg_end(skb, nlh);
2314         return 0;
2315 
2316 out_cancel:
2317         nlmsg_cancel(skb, nlh);
2318         return err;
2319 }
2320 
2321 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2322                              const struct xfrm_migrate *m, int num_migrate,
2323                              const struct xfrm_kmaddress *k)
2324 {
2325         struct net *net = &init_net;
2326         struct sk_buff *skb;
2327 
2328         skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2329         if (skb == NULL)
2330                 return -ENOMEM;
2331 
2332         /* build migrate */
2333         if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2334                 BUG();
2335 
2336         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2337 }
2338 #else
2339 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2340                              const struct xfrm_migrate *m, int num_migrate,
2341                              const struct xfrm_kmaddress *k)
2342 {
2343         return -ENOPROTOOPT;
2344 }
2345 #endif
2346 
2347 #define XMSGSIZE(type) sizeof(struct type)
2348 
2349 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2350         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2351         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2352         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2353         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2354         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2355         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2356         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2357         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2358         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2359         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2360         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2361         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2362         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2363         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2364         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2365         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2366         [XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2367         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2368         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2369         [XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2370         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2371 };
2372 
2373 #undef XMSGSIZE
2374 
2375 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2376         [XFRMA_SA]              = { .len = sizeof(struct xfrm_usersa_info)},
2377         [XFRMA_POLICY]          = { .len = sizeof(struct xfrm_userpolicy_info)},
2378         [XFRMA_LASTUSED]        = { .type = NLA_U64},
2379         [XFRMA_ALG_AUTH_TRUNC]  = { .len = sizeof(struct xfrm_algo_auth)},
2380         [XFRMA_ALG_AEAD]        = { .len = sizeof(struct xfrm_algo_aead) },
2381         [XFRMA_ALG_AUTH]        = { .len = sizeof(struct xfrm_algo) },
2382         [XFRMA_ALG_CRYPT]       = { .len = sizeof(struct xfrm_algo) },
2383         [XFRMA_ALG_COMP]        = { .len = sizeof(struct xfrm_algo) },
2384         [XFRMA_ENCAP]           = { .len = sizeof(struct xfrm_encap_tmpl) },
2385         [XFRMA_TMPL]            = { .len = sizeof(struct xfrm_user_tmpl) },
2386         [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_sec_ctx) },
2387         [XFRMA_LTIME_VAL]       = { .len = sizeof(struct xfrm_lifetime_cur) },
2388         [XFRMA_REPLAY_VAL]      = { .len = sizeof(struct xfrm_replay_state) },
2389         [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },
2390         [XFRMA_ETIMER_THRESH]   = { .type = NLA_U32 },
2391         [XFRMA_SRCADDR]         = { .len = sizeof(xfrm_address_t) },
2392         [XFRMA_COADDR]          = { .len = sizeof(xfrm_address_t) },
2393         [XFRMA_POLICY_TYPE]     = { .len = sizeof(struct xfrm_userpolicy_type)},
2394         [XFRMA_MIGRATE]         = { .len = sizeof(struct xfrm_user_migrate) },
2395         [XFRMA_KMADDRESS]       = { .len = sizeof(struct xfrm_user_kmaddress) },
2396         [XFRMA_MARK]            = { .len = sizeof(struct xfrm_mark) },
2397         [XFRMA_TFCPAD]          = { .type = NLA_U32 },
2398         [XFRMA_REPLAY_ESN_VAL]  = { .len = sizeof(struct xfrm_replay_state_esn) },
2399         [XFRMA_SA_EXTRA_FLAGS]  = { .type = NLA_U32 },
2400         [XFRMA_PROTO]           = { .type = NLA_U8 },
2401         [XFRMA_ADDRESS_FILTER]  = { .len = sizeof(struct xfrm_address_filter) },
2402 };
2403 
2404 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2405         [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2406         [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2407 };
2408 
2409 static const struct xfrm_link {
2410         int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2411         int (*dump)(struct sk_buff *, struct netlink_callback *);
2412         int (*done)(struct netlink_callback *);
2413         const struct nla_policy *nla_pol;
2414         int nla_max;
2415 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2416         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2417         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2418         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2419                                                    .dump = xfrm_dump_sa,
2420                                                    .done = xfrm_dump_sa_done  },
2421         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2422         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2423         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2424                                                    .dump = xfrm_dump_policy,
2425                                                    .done = xfrm_dump_policy_done },
2426         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2427         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2428         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2429         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2430         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2431         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2432         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2433         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2434         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2435         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2436         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2437         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2438         [XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2439                                                    .nla_pol = xfrma_spd_policy,
2440                                                    .nla_max = XFRMA_SPD_MAX },
2441         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2442 };
2443 
2444 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2445 {
2446         struct net *net = sock_net(skb->sk);
2447         struct nlattr *attrs[XFRMA_MAX+1];
2448         const struct xfrm_link *link;
2449         int type, err;
2450 
2451 #ifdef CONFIG_COMPAT
2452         if (in_compat_syscall())
2453                 return -ENOTSUPP;
2454 #endif
2455 
2456         type = nlh->nlmsg_type;
2457         if (type > XFRM_MSG_MAX)
2458                 return -EINVAL;
2459 
2460         type -= XFRM_MSG_BASE;
2461         link = &xfrm_dispatch[type];
2462 
2463         /* All operations require privileges, even GET */
2464         if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2465                 return -EPERM;
2466 
2467         if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2468              type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2469             (nlh->nlmsg_flags & NLM_F_DUMP)) {
2470                 if (link->dump == NULL)
2471                         return -EINVAL;
2472 
2473                 {
2474                         struct netlink_dump_control c = {
2475                                 .dump = link->dump,
2476                                 .done = link->done,
2477                         };
2478                         return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2479                 }
2480         }
2481 
2482         err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2483                           link->nla_max ? : XFRMA_MAX,
2484                           link->nla_pol ? : xfrma_policy);
2485         if (err < 0)
2486                 return err;
2487 
2488         if (link->doit == NULL)
2489                 return -EINVAL;
2490 
2491         return link->doit(skb, nlh, attrs);
2492 }
2493 
2494 static void xfrm_netlink_rcv(struct sk_buff *skb)
2495 {
2496         struct net *net = sock_net(skb->sk);
2497 
2498         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2499         netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2500         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2501 }
2502 
2503 static inline size_t xfrm_expire_msgsize(void)
2504 {
2505         return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2506                + nla_total_size(sizeof(struct xfrm_mark));
2507 }
2508 
2509 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2510 {
2511         struct xfrm_user_expire *ue;
2512         struct nlmsghdr *nlh;
2513         int err;
2514 
2515         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2516         if (nlh == NULL)
2517                 return -EMSGSIZE;
2518 
2519         ue = nlmsg_data(nlh);
2520         copy_to_user_state(x, &ue->state);
2521         ue->hard = (c->data.hard != 0) ? 1 : 0;
2522 
2523         err = xfrm_mark_put(skb, &x->mark);
2524         if (err)
2525                 return err;
2526 
2527         nlmsg_end(skb, nlh);
2528         return 0;
2529 }
2530 
2531 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2532 {
2533         struct net *net = xs_net(x);
2534         struct sk_buff *skb;
2535 
2536         skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2537         if (skb == NULL)
2538                 return -ENOMEM;
2539 
2540         if (build_expire(skb, x, c) < 0) {
2541                 kfree_skb(skb);
2542                 return -EMSGSIZE;
2543         }
2544 
2545         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2546 }
2547 
2548 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2549 {
2550         struct net *net = xs_net(x);
2551         struct sk_buff *skb;
2552 
2553         skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2554         if (skb == NULL)
2555                 return -ENOMEM;
2556 
2557         if (build_aevent(skb, x, c) < 0)
2558                 BUG();
2559 
2560         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2561 }
2562 
2563 static int xfrm_notify_sa_flush(const struct km_event *c)
2564 {
2565         struct net *net = c->net;
2566         struct xfrm_usersa_flush *p;
2567         struct nlmsghdr *nlh;
2568         struct sk_buff *skb;
2569         int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2570 
2571         skb = nlmsg_new(len, GFP_ATOMIC);
2572         if (skb == NULL)
2573                 return -ENOMEM;
2574 
2575         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2576         if (nlh == NULL) {
2577                 kfree_skb(skb);
2578                 return -EMSGSIZE;
2579         }
2580 
2581         p = nlmsg_data(nlh);
2582         p->proto = c->data.proto;
2583 
2584         nlmsg_end(skb, nlh);
2585 
2586         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2587 }
2588 
2589 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2590 {
2591         size_t l = 0;
2592         if (x->aead)
2593                 l += nla_total_size(aead_len(x->aead));
2594         if (x->aalg) {
2595                 l += nla_total_size(sizeof(struct xfrm_algo) +
2596                                     (x->aalg->alg_key_len + 7) / 8);
2597                 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2598         }
2599         if (x->ealg)
2600                 l += nla_total_size(xfrm_alg_len(x->ealg));
2601         if (x->calg)
2602                 l += nla_total_size(sizeof(*x->calg));
2603         if (x->encap)
2604                 l += nla_total_size(sizeof(*x->encap));
2605         if (x->tfcpad)
2606                 l += nla_total_size(sizeof(x->tfcpad));
2607         if (x->replay_esn)
2608                 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2609         else
2610                 l += nla_total_size(sizeof(struct xfrm_replay_state));
2611         if (x->security)
2612                 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2613                                     x->security->ctx_len);
2614         if (x->coaddr)
2615                 l += nla_total_size(sizeof(*x->coaddr));
2616         if (x->props.extra_flags)
2617                 l += nla_total_size(sizeof(x->props.extra_flags));
2618 
2619         /* Must count x->lastused as it may become non-zero behind our back. */
2620         l += nla_total_size(sizeof(u64));
2621 
2622         return l;
2623 }
2624 
2625 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2626 {
2627         struct net *net = xs_net(x);
2628         struct xfrm_usersa_info *p;
2629         struct xfrm_usersa_id *id;
2630         struct nlmsghdr *nlh;
2631         struct sk_buff *skb;
2632         int len = xfrm_sa_len(x);
2633         int headlen, err;
2634 
2635         headlen = sizeof(*p);
2636         if (c->event == XFRM_MSG_DELSA) {
2637                 len += nla_total_size(headlen);
2638                 headlen = sizeof(*id);
2639                 len += nla_total_size(sizeof(struct xfrm_mark));
2640         }
2641         len += NLMSG_ALIGN(headlen);
2642 
2643         skb = nlmsg_new(len, GFP_ATOMIC);
2644         if (skb == NULL)
2645                 return -ENOMEM;
2646 
2647         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2648         err = -EMSGSIZE;
2649         if (nlh == NULL)
2650                 goto out_free_skb;
2651 
2652         p = nlmsg_data(nlh);
2653         if (c->event == XFRM_MSG_DELSA) {
2654                 struct nlattr *attr;
2655 
2656                 id = nlmsg_data(nlh);
2657                 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2658                 id->spi = x->id.spi;
2659                 id->family = x->props.family;
2660                 id->proto = x->id.proto;
2661 
2662                 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2663                 err = -EMSGSIZE;
2664                 if (attr == NULL)
2665                         goto out_free_skb;
2666 
2667                 p = nla_data(attr);
2668         }
2669         err = copy_to_user_state_extra(x, p, skb);
2670         if (err)
2671                 goto out_free_skb;
2672 
2673         nlmsg_end(skb, nlh);
2674 
2675         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2676 
2677 out_free_skb:
2678         kfree_skb(skb);
2679         return err;
2680 }
2681 
2682 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2683 {
2684 
2685         switch (c->event) {
2686         case XFRM_MSG_EXPIRE:
2687                 return xfrm_exp_state_notify(x, c);
2688         case XFRM_MSG_NEWAE:
2689                 return xfrm_aevent_state_notify(x, c);
2690         case XFRM_MSG_DELSA:
2691         case XFRM_MSG_UPDSA:
2692         case XFRM_MSG_NEWSA:
2693                 return xfrm_notify_sa(x, c);
2694         case XFRM_MSG_FLUSHSA:
2695                 return xfrm_notify_sa_flush(c);
2696         default:
2697                 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2698                        c->event);
2699                 break;
2700         }
2701 
2702         return 0;
2703 
2704 }
2705 
2706 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2707                                           struct xfrm_policy *xp)
2708 {
2709         return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2710                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2711                + nla_total_size(sizeof(struct xfrm_mark))
2712                + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2713                + userpolicy_type_attrsize();
2714 }
2715 
2716 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2717                          struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2718 {
2719         __u32 seq = xfrm_get_acqseq();
2720         struct xfrm_user_acquire *ua;
2721         struct nlmsghdr *nlh;
2722         int err;
2723 
2724         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2725         if (nlh == NULL)
2726                 return -EMSGSIZE;
2727 
2728         ua = nlmsg_data(nlh);
2729         memcpy(&ua->id, &x->id, sizeof(ua->id));
2730         memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2731         memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2732         copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2733         ua->aalgos = xt->aalgos;
2734         ua->ealgos = xt->ealgos;
2735         ua->calgos = xt->calgos;
2736         ua->seq = x->km.seq = seq;
2737 
2738         err = copy_to_user_tmpl(xp, skb);
2739         if (!err)
2740                 err = copy_to_user_state_sec_ctx(x, skb);
2741         if (!err)
2742                 err = copy_to_user_policy_type(xp->type, skb);
2743         if (!err)
2744                 err = xfrm_mark_put(skb, &xp->mark);
2745         if (err) {
2746                 nlmsg_cancel(skb, nlh);
2747                 return err;
2748         }
2749 
2750         nlmsg_end(skb, nlh);
2751         return 0;
2752 }
2753 
2754 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2755                              struct xfrm_policy *xp)
2756 {
2757         struct net *net = xs_net(x);
2758         struct sk_buff *skb;
2759 
2760         skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2761         if (skb == NULL)
2762                 return -ENOMEM;
2763 
2764         if (build_acquire(skb, x, xt, xp) < 0)
2765                 BUG();
2766 
2767         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2768 }
2769 
2770 /* User gives us xfrm_user_policy_info followed by an array of 0
2771  * or more templates.
2772  */
2773 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2774                                                u8 *data, int len, int *dir)
2775 {
2776         struct net *net = sock_net(sk);
2777         struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2778         struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2779         struct xfrm_policy *xp;
2780         int nr;
2781 
2782         switch (sk->sk_family) {
2783         case AF_INET:
2784                 if (opt != IP_XFRM_POLICY) {
2785                         *dir = -EOPNOTSUPP;
2786                         return NULL;
2787                 }
2788                 break;
2789 #if IS_ENABLED(CONFIG_IPV6)
2790         case AF_INET6:
2791                 if (opt != IPV6_XFRM_POLICY) {
2792                         *dir = -EOPNOTSUPP;
2793                         return NULL;
2794                 }
2795                 break;
2796 #endif
2797         default:
2798                 *dir = -EINVAL;
2799                 return NULL;
2800         }
2801 
2802         *dir = -EINVAL;
2803 
2804         if (len < sizeof(*p) ||
2805             verify_newpolicy_info(p))
2806                 return NULL;
2807 
2808         nr = ((len - sizeof(*p)) / sizeof(*ut));
2809         if (validate_tmpl(nr, ut, p->sel.family))
2810                 return NULL;
2811 
2812         if (p->dir > XFRM_POLICY_OUT)
2813                 return NULL;
2814 
2815         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2816         if (xp == NULL) {
2817                 *dir = -ENOBUFS;
2818                 return NULL;
2819         }
2820 
2821         copy_from_user_policy(xp, p);
2822         xp->type = XFRM_POLICY_TYPE_MAIN;
2823         copy_templates(xp, ut, nr);
2824 
2825         *dir = p->dir;
2826 
2827         return xp;
2828 }
2829 
2830 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2831 {
2832         return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2833                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2834                + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2835                + nla_total_size(sizeof(struct xfrm_mark))
2836                + userpolicy_type_attrsize();
2837 }
2838 
2839 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2840                            int dir, const struct km_event *c)
2841 {
2842         struct xfrm_user_polexpire *upe;
2843         int hard = c->data.hard;
2844         struct nlmsghdr *nlh;
2845         int err;
2846 
2847         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2848         if (nlh == NULL)
2849                 return -EMSGSIZE;
2850 
2851         upe = nlmsg_data(nlh);
2852         copy_to_user_policy(xp, &upe->pol, dir);
2853         err = copy_to_user_tmpl(xp, skb);
2854         if (!err)
2855                 err = copy_to_user_sec_ctx(xp, skb);
2856         if (!err)
2857                 err = copy_to_user_policy_type(xp->type, skb);
2858         if (!err)
2859                 err = xfrm_mark_put(skb, &xp->mark);
2860         if (err) {
2861                 nlmsg_cancel(skb, nlh);
2862                 return err;
2863         }
2864         upe->hard = !!hard;
2865 
2866         nlmsg_end(skb, nlh);
2867         return 0;
2868 }
2869 
2870 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2871 {
2872         struct net *net = xp_net(xp);
2873         struct sk_buff *skb;
2874 
2875         skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2876         if (skb == NULL)
2877                 return -ENOMEM;
2878 
2879         if (build_polexpire(skb, xp, dir, c) < 0)
2880                 BUG();
2881 
2882         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2883 }
2884 
2885 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2886 {
2887         int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2888         struct net *net = xp_net(xp);
2889         struct xfrm_userpolicy_info *p;
2890         struct xfrm_userpolicy_id *id;
2891         struct nlmsghdr *nlh;
2892         struct sk_buff *skb;
2893         int headlen, err;
2894 
2895         headlen = sizeof(*p);
2896         if (c->event == XFRM_MSG_DELPOLICY) {
2897                 len += nla_total_size(headlen);
2898                 headlen = sizeof(*id);
2899         }
2900         len += userpolicy_type_attrsize();
2901         len += nla_total_size(sizeof(struct xfrm_mark));
2902         len += NLMSG_ALIGN(headlen);
2903 
2904         skb = nlmsg_new(len, GFP_ATOMIC);
2905         if (skb == NULL)
2906                 return -ENOMEM;
2907 
2908         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2909         err = -EMSGSIZE;
2910         if (nlh == NULL)
2911                 goto out_free_skb;
2912 
2913         p = nlmsg_data(nlh);
2914         if (c->event == XFRM_MSG_DELPOLICY) {
2915                 struct nlattr *attr;
2916 
2917                 id = nlmsg_data(nlh);
2918                 memset(id, 0, sizeof(*id));
2919                 id->dir = dir;
2920                 if (c->data.byid)
2921                         id->index = xp->index;
2922                 else
2923                         memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2924 
2925                 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2926                 err = -EMSGSIZE;
2927                 if (attr == NULL)
2928                         goto out_free_skb;
2929 
2930                 p = nla_data(attr);
2931         }
2932 
2933         copy_to_user_policy(xp, p, dir);
2934         err = copy_to_user_tmpl(xp, skb);
2935         if (!err)
2936                 err = copy_to_user_policy_type(xp->type, skb);
2937         if (!err)
2938                 err = xfrm_mark_put(skb, &xp->mark);
2939         if (err)
2940                 goto out_free_skb;
2941 
2942         nlmsg_end(skb, nlh);
2943 
2944         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2945 
2946 out_free_skb:
2947         kfree_skb(skb);
2948         return err;
2949 }
2950 
2951 static int xfrm_notify_policy_flush(const struct km_event *c)
2952 {
2953         struct net *net = c->net;
2954         struct nlmsghdr *nlh;
2955         struct sk_buff *skb;
2956         int err;
2957 
2958         skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2959         if (skb == NULL)
2960                 return -ENOMEM;
2961 
2962         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2963         err = -EMSGSIZE;
2964         if (nlh == NULL)
2965                 goto out_free_skb;
2966         err = copy_to_user_policy_type(c->data.type, skb);
2967         if (err)
2968                 goto out_free_skb;
2969 
2970         nlmsg_end(skb, nlh);
2971 
2972         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2973 
2974 out_free_skb:
2975         kfree_skb(skb);
2976         return err;
2977 }
2978 
2979 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2980 {
2981 
2982         switch (c->event) {
2983         case XFRM_MSG_NEWPOLICY:
2984         case XFRM_MSG_UPDPOLICY:
2985         case XFRM_MSG_DELPOLICY:
2986                 return xfrm_notify_policy(xp, dir, c);
2987         case XFRM_MSG_FLUSHPOLICY:
2988                 return xfrm_notify_policy_flush(c);
2989         case XFRM_MSG_POLEXPIRE:
2990                 return xfrm_exp_policy_notify(xp, dir, c);
2991         default:
2992                 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2993                        c->event);
2994         }
2995 
2996         return 0;
2997 
2998 }
2999 
3000 static inline size_t xfrm_report_msgsize(void)
3001 {
3002         return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3003 }
3004 
3005 static int build_report(struct sk_buff *skb, u8 proto,
3006                         struct xfrm_selector *sel, xfrm_address_t *addr)
3007 {
3008         struct xfrm_user_report *ur;
3009         struct nlmsghdr *nlh;
3010 
3011         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3012         if (nlh == NULL)
3013                 return -EMSGSIZE;
3014 
3015         ur = nlmsg_data(nlh);
3016         ur->proto = proto;
3017         memcpy(&ur->sel, sel, sizeof(ur->sel));
3018 
3019         if (addr) {
3020                 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3021                 if (err) {
3022                         nlmsg_cancel(skb, nlh);
3023                         return err;
3024                 }
3025         }
3026         nlmsg_end(skb, nlh);
3027         return 0;
3028 }
3029 
3030 static int xfrm_send_report(struct net *net, u8 proto,
3031                             struct xfrm_selector *sel, xfrm_address_t *addr)
3032 {
3033         struct sk_buff *skb;
3034 
3035         skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3036         if (skb == NULL)
3037                 return -ENOMEM;
3038 
3039         if (build_report(skb, proto, sel, addr) < 0)
3040                 BUG();
3041 
3042         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3043 }
3044 
3045 static inline size_t xfrm_mapping_msgsize(void)
3046 {
3047         return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3048 }
3049 
3050 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3051                          xfrm_address_t *new_saddr, __be16 new_sport)
3052 {
3053         struct xfrm_user_mapping *um;
3054         struct nlmsghdr *nlh;
3055 
3056         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3057         if (nlh == NULL)
3058                 return -EMSGSIZE;
3059 
3060         um = nlmsg_data(nlh);
3061 
3062         memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3063         um->id.spi = x->id.spi;
3064         um->id.family = x->props.family;
3065         um->id.proto = x->id.proto;
3066         memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3067         memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3068         um->new_sport = new_sport;
3069         um->old_sport = x->encap->encap_sport;
3070         um->reqid = x->props.reqid;
3071 
3072         nlmsg_end(skb, nlh);
3073         return 0;
3074 }
3075 
3076 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3077                              __be16 sport)
3078 {
3079         struct net *net = xs_net(x);
3080         struct sk_buff *skb;
3081 
3082         if (x->id.proto != IPPROTO_ESP)
3083                 return -EINVAL;
3084 
3085         if (!x->encap)
3086                 return -EINVAL;
3087 
3088         skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3089         if (skb == NULL)
3090                 return -ENOMEM;
3091 
3092         if (build_mapping(skb, x, ipaddr, sport) < 0)
3093                 BUG();
3094 
3095         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3096 }
3097 
3098 static bool xfrm_is_alive(const struct km_event *c)
3099 {
3100         return (bool)xfrm_acquire_is_on(c->net);
3101 }
3102 
3103 static struct xfrm_mgr netlink_mgr = {
3104         .id             = "netlink",
3105         .notify         = xfrm_send_state_notify,
3106         .acquire        = xfrm_send_acquire,
3107         .compile_policy = xfrm_compile_policy,
3108         .notify_policy  = xfrm_send_policy_notify,
3109         .report         = xfrm_send_report,
3110         .migrate        = xfrm_send_migrate,
3111         .new_mapping    = xfrm_send_mapping,
3112         .is_alive       = xfrm_is_alive,
3113 };
3114 
3115 static int __net_init xfrm_user_net_init(struct net *net)
3116 {
3117         struct sock *nlsk;
3118         struct netlink_kernel_cfg cfg = {
3119                 .groups = XFRMNLGRP_MAX,
3120                 .input  = xfrm_netlink_rcv,
3121         };
3122 
3123         nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3124         if (nlsk == NULL)
3125                 return -ENOMEM;
3126         net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3127         rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3128         return 0;
3129 }
3130 
3131 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3132 {
3133         struct net *net;
3134         list_for_each_entry(net, net_exit_list, exit_list)
3135                 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3136         synchronize_net();
3137         list_for_each_entry(net, net_exit_list, exit_list)
3138                 netlink_kernel_release(net->xfrm.nlsk_stash);
3139 }
3140 
3141 static struct pernet_operations xfrm_user_net_ops = {
3142         .init       = xfrm_user_net_init,
3143         .exit_batch = xfrm_user_net_exit,
3144 };
3145 
3146 static int __init xfrm_user_init(void)
3147 {
3148         int rv;
3149 
3150         printk(KERN_INFO "Initializing XFRM netlink socket\n");
3151 
3152         rv = register_pernet_subsys(&xfrm_user_net_ops);
3153         if (rv < 0)
3154                 return rv;
3155         rv = xfrm_register_km(&netlink_mgr);
3156         if (rv < 0)
3157                 unregister_pernet_subsys(&xfrm_user_net_ops);
3158         return rv;
3159 }
3160 
3161 static void __exit xfrm_user_exit(void)
3162 {
3163         xfrm_unregister_km(&netlink_mgr);
3164         unregister_pernet_subsys(&xfrm_user_net_ops);
3165 }
3166 
3167 module_init(xfrm_user_init);
3168 module_exit(xfrm_user_exit);
3169 MODULE_LICENSE("GPL");
3170 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3171 
3172 

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