Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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                 err = security_xfrm_state_alloc(x,
586                                                 nla_data(attrs[XFRMA_SEC_CTX]));
587                 if (err)
588                         goto error;
589         }
590 
591         if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
592                                                attrs[XFRMA_REPLAY_ESN_VAL])))
593                 goto error;
594 
595         x->km.seq = p->seq;
596         x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
597         /* sysctl_xfrm_aevent_etime is in 100ms units */
598         x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
599 
600         if ((err = xfrm_init_replay(x)))
601                 goto error;
602 
603         /* override default values from above */
604         xfrm_update_ae_params(x, attrs, 0);
605 
606         return x;
607 
608 error:
609         x->km.state = XFRM_STATE_DEAD;
610         xfrm_state_put(x);
611 error_no_put:
612         *errp = err;
613         return NULL;
614 }
615 
616 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
617                 struct nlattr **attrs)
618 {
619         struct net *net = sock_net(skb->sk);
620         struct xfrm_usersa_info *p = nlmsg_data(nlh);
621         struct xfrm_state *x;
622         int err;
623         struct km_event c;
624 
625         err = verify_newsa_info(p, attrs);
626         if (err)
627                 return err;
628 
629         x = xfrm_state_construct(net, p, attrs, &err);
630         if (!x)
631                 return err;
632 
633         xfrm_state_hold(x);
634         if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
635                 err = xfrm_state_add(x);
636         else
637                 err = xfrm_state_update(x);
638 
639         xfrm_audit_state_add(x, err ? 0 : 1, true);
640 
641         if (err < 0) {
642                 x->km.state = XFRM_STATE_DEAD;
643                 __xfrm_state_put(x);
644                 goto out;
645         }
646 
647         c.seq = nlh->nlmsg_seq;
648         c.portid = nlh->nlmsg_pid;
649         c.event = nlh->nlmsg_type;
650 
651         km_state_notify(x, &c);
652 out:
653         xfrm_state_put(x);
654         return err;
655 }
656 
657 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
658                                                  struct xfrm_usersa_id *p,
659                                                  struct nlattr **attrs,
660                                                  int *errp)
661 {
662         struct xfrm_state *x = NULL;
663         struct xfrm_mark m;
664         int err;
665         u32 mark = xfrm_mark_get(attrs, &m);
666 
667         if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
668                 err = -ESRCH;
669                 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
670         } else {
671                 xfrm_address_t *saddr = NULL;
672 
673                 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
674                 if (!saddr) {
675                         err = -EINVAL;
676                         goto out;
677                 }
678 
679                 err = -ESRCH;
680                 x = xfrm_state_lookup_byaddr(net, mark,
681                                              &p->daddr, saddr,
682                                              p->proto, p->family);
683         }
684 
685  out:
686         if (!x && errp)
687                 *errp = err;
688         return x;
689 }
690 
691 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
692                 struct nlattr **attrs)
693 {
694         struct net *net = sock_net(skb->sk);
695         struct xfrm_state *x;
696         int err = -ESRCH;
697         struct km_event c;
698         struct xfrm_usersa_id *p = nlmsg_data(nlh);
699 
700         x = xfrm_user_state_lookup(net, p, attrs, &err);
701         if (x == NULL)
702                 return err;
703 
704         if ((err = security_xfrm_state_delete(x)) != 0)
705                 goto out;
706 
707         if (xfrm_state_kern(x)) {
708                 err = -EPERM;
709                 goto out;
710         }
711 
712         err = xfrm_state_delete(x);
713 
714         if (err < 0)
715                 goto out;
716 
717         c.seq = nlh->nlmsg_seq;
718         c.portid = nlh->nlmsg_pid;
719         c.event = nlh->nlmsg_type;
720         km_state_notify(x, &c);
721 
722 out:
723         xfrm_audit_state_delete(x, err ? 0 : 1, true);
724         xfrm_state_put(x);
725         return err;
726 }
727 
728 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
729 {
730         memset(p, 0, sizeof(*p));
731         memcpy(&p->id, &x->id, sizeof(p->id));
732         memcpy(&p->sel, &x->sel, sizeof(p->sel));
733         memcpy(&p->lft, &x->lft, sizeof(p->lft));
734         memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
735         put_unaligned(x->stats.replay_window, &p->stats.replay_window);
736         put_unaligned(x->stats.replay, &p->stats.replay);
737         put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
738         memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
739         p->mode = x->props.mode;
740         p->replay_window = x->props.replay_window;
741         p->reqid = x->props.reqid;
742         p->family = x->props.family;
743         p->flags = x->props.flags;
744         p->seq = x->km.seq;
745 }
746 
747 struct xfrm_dump_info {
748         struct sk_buff *in_skb;
749         struct sk_buff *out_skb;
750         u32 nlmsg_seq;
751         u16 nlmsg_flags;
752 };
753 
754 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
755 {
756         struct xfrm_user_sec_ctx *uctx;
757         struct nlattr *attr;
758         int ctx_size = sizeof(*uctx) + s->ctx_len;
759 
760         attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
761         if (attr == NULL)
762                 return -EMSGSIZE;
763 
764         uctx = nla_data(attr);
765         uctx->exttype = XFRMA_SEC_CTX;
766         uctx->len = ctx_size;
767         uctx->ctx_doi = s->ctx_doi;
768         uctx->ctx_alg = s->ctx_alg;
769         uctx->ctx_len = s->ctx_len;
770         memcpy(uctx + 1, s->ctx_str, s->ctx_len);
771 
772         return 0;
773 }
774 
775 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
776 {
777         struct xfrm_algo *algo;
778         struct nlattr *nla;
779 
780         nla = nla_reserve(skb, XFRMA_ALG_AUTH,
781                           sizeof(*algo) + (auth->alg_key_len + 7) / 8);
782         if (!nla)
783                 return -EMSGSIZE;
784 
785         algo = nla_data(nla);
786         strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
787         memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
788         algo->alg_key_len = auth->alg_key_len;
789 
790         return 0;
791 }
792 
793 /* Don't change this without updating xfrm_sa_len! */
794 static int copy_to_user_state_extra(struct xfrm_state *x,
795                                     struct xfrm_usersa_info *p,
796                                     struct sk_buff *skb)
797 {
798         int ret = 0;
799 
800         copy_to_user_state(x, p);
801 
802         if (x->props.extra_flags) {
803                 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
804                                   x->props.extra_flags);
805                 if (ret)
806                         goto out;
807         }
808 
809         if (x->coaddr) {
810                 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
811                 if (ret)
812                         goto out;
813         }
814         if (x->lastused) {
815                 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
816                                         XFRMA_PAD);
817                 if (ret)
818                         goto out;
819         }
820         if (x->aead) {
821                 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
822                 if (ret)
823                         goto out;
824         }
825         if (x->aalg) {
826                 ret = copy_to_user_auth(x->aalg, skb);
827                 if (!ret)
828                         ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
829                                       xfrm_alg_auth_len(x->aalg), x->aalg);
830                 if (ret)
831                         goto out;
832         }
833         if (x->ealg) {
834                 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
835                 if (ret)
836                         goto out;
837         }
838         if (x->calg) {
839                 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
840                 if (ret)
841                         goto out;
842         }
843         if (x->encap) {
844                 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
845                 if (ret)
846                         goto out;
847         }
848         if (x->tfcpad) {
849                 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
850                 if (ret)
851                         goto out;
852         }
853         ret = xfrm_mark_put(skb, &x->mark);
854         if (ret)
855                 goto out;
856         if (x->replay_esn)
857                 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
858                               xfrm_replay_state_esn_len(x->replay_esn),
859                               x->replay_esn);
860         else
861                 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
862                               &x->replay);
863         if (ret)
864                 goto out;
865         if (x->security)
866                 ret = copy_sec_ctx(x->security, skb);
867 out:
868         return ret;
869 }
870 
871 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
872 {
873         struct xfrm_dump_info *sp = ptr;
874         struct sk_buff *in_skb = sp->in_skb;
875         struct sk_buff *skb = sp->out_skb;
876         struct xfrm_usersa_info *p;
877         struct nlmsghdr *nlh;
878         int err;
879 
880         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
881                         XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
882         if (nlh == NULL)
883                 return -EMSGSIZE;
884 
885         p = nlmsg_data(nlh);
886 
887         err = copy_to_user_state_extra(x, p, skb);
888         if (err) {
889                 nlmsg_cancel(skb, nlh);
890                 return err;
891         }
892         nlmsg_end(skb, nlh);
893         return 0;
894 }
895 
896 static int xfrm_dump_sa_done(struct netlink_callback *cb)
897 {
898         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
899         struct sock *sk = cb->skb->sk;
900         struct net *net = sock_net(sk);
901 
902         if (cb->args[0])
903                 xfrm_state_walk_done(walk, net);
904         return 0;
905 }
906 
907 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
908 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
909 {
910         struct net *net = sock_net(skb->sk);
911         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
912         struct xfrm_dump_info info;
913 
914         BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
915                      sizeof(cb->args) - sizeof(cb->args[0]));
916 
917         info.in_skb = cb->skb;
918         info.out_skb = skb;
919         info.nlmsg_seq = cb->nlh->nlmsg_seq;
920         info.nlmsg_flags = NLM_F_MULTI;
921 
922         if (!cb->args[0]) {
923                 struct nlattr *attrs[XFRMA_MAX+1];
924                 struct xfrm_address_filter *filter = NULL;
925                 u8 proto = 0;
926                 int err;
927 
928                 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
929                                   xfrma_policy);
930                 if (err < 0)
931                         return err;
932 
933                 if (attrs[XFRMA_ADDRESS_FILTER]) {
934                         filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
935                                          sizeof(*filter), GFP_KERNEL);
936                         if (filter == NULL)
937                                 return -ENOMEM;
938                 }
939 
940                 if (attrs[XFRMA_PROTO])
941                         proto = nla_get_u8(attrs[XFRMA_PROTO]);
942 
943                 xfrm_state_walk_init(walk, proto, filter);
944                 cb->args[0] = 1;
945         }
946 
947         (void) xfrm_state_walk(net, walk, dump_one_state, &info);
948 
949         return skb->len;
950 }
951 
952 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
953                                           struct xfrm_state *x, u32 seq)
954 {
955         struct xfrm_dump_info info;
956         struct sk_buff *skb;
957         int err;
958 
959         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
960         if (!skb)
961                 return ERR_PTR(-ENOMEM);
962 
963         info.in_skb = in_skb;
964         info.out_skb = skb;
965         info.nlmsg_seq = seq;
966         info.nlmsg_flags = 0;
967 
968         err = dump_one_state(x, 0, &info);
969         if (err) {
970                 kfree_skb(skb);
971                 return ERR_PTR(err);
972         }
973 
974         return skb;
975 }
976 
977 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
978  * Must be called with RCU read lock.
979  */
980 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
981                                        u32 pid, unsigned int group)
982 {
983         struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
984 
985         if (nlsk)
986                 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
987         else
988                 return -1;
989 }
990 
991 static inline size_t xfrm_spdinfo_msgsize(void)
992 {
993         return NLMSG_ALIGN(4)
994                + nla_total_size(sizeof(struct xfrmu_spdinfo))
995                + nla_total_size(sizeof(struct xfrmu_spdhinfo))
996                + nla_total_size(sizeof(struct xfrmu_spdhthresh))
997                + nla_total_size(sizeof(struct xfrmu_spdhthresh));
998 }
999 
1000 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1001                          u32 portid, u32 seq, u32 flags)
1002 {
1003         struct xfrmk_spdinfo si;
1004         struct xfrmu_spdinfo spc;
1005         struct xfrmu_spdhinfo sph;
1006         struct xfrmu_spdhthresh spt4, spt6;
1007         struct nlmsghdr *nlh;
1008         int err;
1009         u32 *f;
1010         unsigned lseq;
1011 
1012         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1013         if (nlh == NULL) /* shouldn't really happen ... */
1014                 return -EMSGSIZE;
1015 
1016         f = nlmsg_data(nlh);
1017         *f = flags;
1018         xfrm_spd_getinfo(net, &si);
1019         spc.incnt = si.incnt;
1020         spc.outcnt = si.outcnt;
1021         spc.fwdcnt = si.fwdcnt;
1022         spc.inscnt = si.inscnt;
1023         spc.outscnt = si.outscnt;
1024         spc.fwdscnt = si.fwdscnt;
1025         sph.spdhcnt = si.spdhcnt;
1026         sph.spdhmcnt = si.spdhmcnt;
1027 
1028         do {
1029                 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1030 
1031                 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1032                 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1033                 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1034                 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1035         } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1036 
1037         err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1038         if (!err)
1039                 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1040         if (!err)
1041                 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1042         if (!err)
1043                 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1044         if (err) {
1045                 nlmsg_cancel(skb, nlh);
1046                 return err;
1047         }
1048 
1049         nlmsg_end(skb, nlh);
1050         return 0;
1051 }
1052 
1053 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1054                             struct nlattr **attrs)
1055 {
1056         struct net *net = sock_net(skb->sk);
1057         struct xfrmu_spdhthresh *thresh4 = NULL;
1058         struct xfrmu_spdhthresh *thresh6 = NULL;
1059 
1060         /* selector prefixlen thresholds to hash policies */
1061         if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1062                 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1063 
1064                 if (nla_len(rta) < sizeof(*thresh4))
1065                         return -EINVAL;
1066                 thresh4 = nla_data(rta);
1067                 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1068                         return -EINVAL;
1069         }
1070         if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1071                 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1072 
1073                 if (nla_len(rta) < sizeof(*thresh6))
1074                         return -EINVAL;
1075                 thresh6 = nla_data(rta);
1076                 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1077                         return -EINVAL;
1078         }
1079 
1080         if (thresh4 || thresh6) {
1081                 write_seqlock(&net->xfrm.policy_hthresh.lock);
1082                 if (thresh4) {
1083                         net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1084                         net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1085                 }
1086                 if (thresh6) {
1087                         net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1088                         net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1089                 }
1090                 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1091 
1092                 xfrm_policy_hash_rebuild(net);
1093         }
1094 
1095         return 0;
1096 }
1097 
1098 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1099                 struct nlattr **attrs)
1100 {
1101         struct net *net = sock_net(skb->sk);
1102         struct sk_buff *r_skb;
1103         u32 *flags = nlmsg_data(nlh);
1104         u32 sportid = NETLINK_CB(skb).portid;
1105         u32 seq = nlh->nlmsg_seq;
1106 
1107         r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1108         if (r_skb == NULL)
1109                 return -ENOMEM;
1110 
1111         if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1112                 BUG();
1113 
1114         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1115 }
1116 
1117 static inline size_t xfrm_sadinfo_msgsize(void)
1118 {
1119         return NLMSG_ALIGN(4)
1120                + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1121                + nla_total_size(4); /* XFRMA_SAD_CNT */
1122 }
1123 
1124 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1125                          u32 portid, u32 seq, u32 flags)
1126 {
1127         struct xfrmk_sadinfo si;
1128         struct xfrmu_sadhinfo sh;
1129         struct nlmsghdr *nlh;
1130         int err;
1131         u32 *f;
1132 
1133         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1134         if (nlh == NULL) /* shouldn't really happen ... */
1135                 return -EMSGSIZE;
1136 
1137         f = nlmsg_data(nlh);
1138         *f = flags;
1139         xfrm_sad_getinfo(net, &si);
1140 
1141         sh.sadhmcnt = si.sadhmcnt;
1142         sh.sadhcnt = si.sadhcnt;
1143 
1144         err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1145         if (!err)
1146                 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1147         if (err) {
1148                 nlmsg_cancel(skb, nlh);
1149                 return err;
1150         }
1151 
1152         nlmsg_end(skb, nlh);
1153         return 0;
1154 }
1155 
1156 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1157                 struct nlattr **attrs)
1158 {
1159         struct net *net = sock_net(skb->sk);
1160         struct sk_buff *r_skb;
1161         u32 *flags = nlmsg_data(nlh);
1162         u32 sportid = NETLINK_CB(skb).portid;
1163         u32 seq = nlh->nlmsg_seq;
1164 
1165         r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1166         if (r_skb == NULL)
1167                 return -ENOMEM;
1168 
1169         if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1170                 BUG();
1171 
1172         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1173 }
1174 
1175 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1176                 struct nlattr **attrs)
1177 {
1178         struct net *net = sock_net(skb->sk);
1179         struct xfrm_usersa_id *p = nlmsg_data(nlh);
1180         struct xfrm_state *x;
1181         struct sk_buff *resp_skb;
1182         int err = -ESRCH;
1183 
1184         x = xfrm_user_state_lookup(net, p, attrs, &err);
1185         if (x == NULL)
1186                 goto out_noput;
1187 
1188         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1189         if (IS_ERR(resp_skb)) {
1190                 err = PTR_ERR(resp_skb);
1191         } else {
1192                 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1193         }
1194         xfrm_state_put(x);
1195 out_noput:
1196         return err;
1197 }
1198 
1199 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1200                 struct nlattr **attrs)
1201 {
1202         struct net *net = sock_net(skb->sk);
1203         struct xfrm_state *x;
1204         struct xfrm_userspi_info *p;
1205         struct sk_buff *resp_skb;
1206         xfrm_address_t *daddr;
1207         int family;
1208         int err;
1209         u32 mark;
1210         struct xfrm_mark m;
1211 
1212         p = nlmsg_data(nlh);
1213         err = verify_spi_info(p->info.id.proto, p->min, p->max);
1214         if (err)
1215                 goto out_noput;
1216 
1217         family = p->info.family;
1218         daddr = &p->info.id.daddr;
1219 
1220         x = NULL;
1221 
1222         mark = xfrm_mark_get(attrs, &m);
1223         if (p->info.seq) {
1224                 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1225                 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1226                         xfrm_state_put(x);
1227                         x = NULL;
1228                 }
1229         }
1230 
1231         if (!x)
1232                 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1233                                   p->info.id.proto, daddr,
1234                                   &p->info.saddr, 1,
1235                                   family);
1236         err = -ENOENT;
1237         if (x == NULL)
1238                 goto out_noput;
1239 
1240         err = xfrm_alloc_spi(x, p->min, p->max);
1241         if (err)
1242                 goto out;
1243 
1244         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1245         if (IS_ERR(resp_skb)) {
1246                 err = PTR_ERR(resp_skb);
1247                 goto out;
1248         }
1249 
1250         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1251 
1252 out:
1253         xfrm_state_put(x);
1254 out_noput:
1255         return err;
1256 }
1257 
1258 static int verify_policy_dir(u8 dir)
1259 {
1260         switch (dir) {
1261         case XFRM_POLICY_IN:
1262         case XFRM_POLICY_OUT:
1263         case XFRM_POLICY_FWD:
1264                 break;
1265 
1266         default:
1267                 return -EINVAL;
1268         }
1269 
1270         return 0;
1271 }
1272 
1273 static int verify_policy_type(u8 type)
1274 {
1275         switch (type) {
1276         case XFRM_POLICY_TYPE_MAIN:
1277 #ifdef CONFIG_XFRM_SUB_POLICY
1278         case XFRM_POLICY_TYPE_SUB:
1279 #endif
1280                 break;
1281 
1282         default:
1283                 return -EINVAL;
1284         }
1285 
1286         return 0;
1287 }
1288 
1289 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1290 {
1291         int ret;
1292 
1293         switch (p->share) {
1294         case XFRM_SHARE_ANY:
1295         case XFRM_SHARE_SESSION:
1296         case XFRM_SHARE_USER:
1297         case XFRM_SHARE_UNIQUE:
1298                 break;
1299 
1300         default:
1301                 return -EINVAL;
1302         }
1303 
1304         switch (p->action) {
1305         case XFRM_POLICY_ALLOW:
1306         case XFRM_POLICY_BLOCK:
1307                 break;
1308 
1309         default:
1310                 return -EINVAL;
1311         }
1312 
1313         switch (p->sel.family) {
1314         case AF_INET:
1315                 break;
1316 
1317         case AF_INET6:
1318 #if IS_ENABLED(CONFIG_IPV6)
1319                 break;
1320 #else
1321                 return  -EAFNOSUPPORT;
1322 #endif
1323 
1324         default:
1325                 return -EINVAL;
1326         }
1327 
1328         ret = verify_policy_dir(p->dir);
1329         if (ret)
1330                 return ret;
1331         if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1332                 return -EINVAL;
1333 
1334         return 0;
1335 }
1336 
1337 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1338 {
1339         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1340         struct xfrm_user_sec_ctx *uctx;
1341 
1342         if (!rt)
1343                 return 0;
1344 
1345         uctx = nla_data(rt);
1346         return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1347 }
1348 
1349 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1350                            int nr)
1351 {
1352         int i;
1353 
1354         xp->xfrm_nr = nr;
1355         for (i = 0; i < nr; i++, ut++) {
1356                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1357 
1358                 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1359                 memcpy(&t->saddr, &ut->saddr,
1360                        sizeof(xfrm_address_t));
1361                 t->reqid = ut->reqid;
1362                 t->mode = ut->mode;
1363                 t->share = ut->share;
1364                 t->optional = ut->optional;
1365                 t->aalgos = ut->aalgos;
1366                 t->ealgos = ut->ealgos;
1367                 t->calgos = ut->calgos;
1368                 /* If all masks are ~0, then we allow all algorithms. */
1369                 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1370                 t->encap_family = ut->family;
1371         }
1372 }
1373 
1374 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1375 {
1376         int i;
1377 
1378         if (nr > XFRM_MAX_DEPTH)
1379                 return -EINVAL;
1380 
1381         for (i = 0; i < nr; i++) {
1382                 /* We never validated the ut->family value, so many
1383                  * applications simply leave it at zero.  The check was
1384                  * never made and ut->family was ignored because all
1385                  * templates could be assumed to have the same family as
1386                  * the policy itself.  Now that we will have ipv4-in-ipv6
1387                  * and ipv6-in-ipv4 tunnels, this is no longer true.
1388                  */
1389                 if (!ut[i].family)
1390                         ut[i].family = family;
1391 
1392                 switch (ut[i].family) {
1393                 case AF_INET:
1394                         break;
1395 #if IS_ENABLED(CONFIG_IPV6)
1396                 case AF_INET6:
1397                         break;
1398 #endif
1399                 default:
1400                         return -EINVAL;
1401                 }
1402         }
1403 
1404         return 0;
1405 }
1406 
1407 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1408 {
1409         struct nlattr *rt = attrs[XFRMA_TMPL];
1410 
1411         if (!rt) {
1412                 pol->xfrm_nr = 0;
1413         } else {
1414                 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1415                 int nr = nla_len(rt) / sizeof(*utmpl);
1416                 int err;
1417 
1418                 err = validate_tmpl(nr, utmpl, pol->family);
1419                 if (err)
1420                         return err;
1421 
1422                 copy_templates(pol, utmpl, nr);
1423         }
1424         return 0;
1425 }
1426 
1427 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1428 {
1429         struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1430         struct xfrm_userpolicy_type *upt;
1431         u8 type = XFRM_POLICY_TYPE_MAIN;
1432         int err;
1433 
1434         if (rt) {
1435                 upt = nla_data(rt);
1436                 type = upt->type;
1437         }
1438 
1439         err = verify_policy_type(type);
1440         if (err)
1441                 return err;
1442 
1443         *tp = type;
1444         return 0;
1445 }
1446 
1447 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1448 {
1449         xp->priority = p->priority;
1450         xp->index = p->index;
1451         memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1452         memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1453         xp->action = p->action;
1454         xp->flags = p->flags;
1455         xp->family = p->sel.family;
1456         /* XXX xp->share = p->share; */
1457 }
1458 
1459 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1460 {
1461         memset(p, 0, sizeof(*p));
1462         memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1463         memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1464         memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1465         p->priority = xp->priority;
1466         p->index = xp->index;
1467         p->sel.family = xp->family;
1468         p->dir = dir;
1469         p->action = xp->action;
1470         p->flags = xp->flags;
1471         p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1472 }
1473 
1474 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1475 {
1476         struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1477         int err;
1478 
1479         if (!xp) {
1480                 *errp = -ENOMEM;
1481                 return NULL;
1482         }
1483 
1484         copy_from_user_policy(xp, p);
1485 
1486         err = copy_from_user_policy_type(&xp->type, attrs);
1487         if (err)
1488                 goto error;
1489 
1490         if (!(err = copy_from_user_tmpl(xp, attrs)))
1491                 err = copy_from_user_sec_ctx(xp, attrs);
1492         if (err)
1493                 goto error;
1494 
1495         xfrm_mark_get(attrs, &xp->mark);
1496 
1497         return xp;
1498  error:
1499         *errp = err;
1500         xp->walk.dead = 1;
1501         xfrm_policy_destroy(xp);
1502         return NULL;
1503 }
1504 
1505 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1506                 struct nlattr **attrs)
1507 {
1508         struct net *net = sock_net(skb->sk);
1509         struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1510         struct xfrm_policy *xp;
1511         struct km_event c;
1512         int err;
1513         int excl;
1514 
1515         err = verify_newpolicy_info(p);
1516         if (err)
1517                 return err;
1518         err = verify_sec_ctx_len(attrs);
1519         if (err)
1520                 return err;
1521 
1522         xp = xfrm_policy_construct(net, p, attrs, &err);
1523         if (!xp)
1524                 return err;
1525 
1526         /* shouldn't excl be based on nlh flags??
1527          * Aha! this is anti-netlink really i.e  more pfkey derived
1528          * in netlink excl is a flag and you wouldnt need
1529          * a type XFRM_MSG_UPDPOLICY - JHS */
1530         excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1531         err = xfrm_policy_insert(p->dir, xp, excl);
1532         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1533 
1534         if (err) {
1535                 security_xfrm_policy_free(xp->security);
1536                 kfree(xp);
1537                 return err;
1538         }
1539 
1540         c.event = nlh->nlmsg_type;
1541         c.seq = nlh->nlmsg_seq;
1542         c.portid = nlh->nlmsg_pid;
1543         km_policy_notify(xp, p->dir, &c);
1544 
1545         xfrm_pol_put(xp);
1546 
1547         return 0;
1548 }
1549 
1550 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1551 {
1552         struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1553         int i;
1554 
1555         if (xp->xfrm_nr == 0)
1556                 return 0;
1557 
1558         for (i = 0; i < xp->xfrm_nr; i++) {
1559                 struct xfrm_user_tmpl *up = &vec[i];
1560                 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1561 
1562                 memset(up, 0, sizeof(*up));
1563                 memcpy(&up->id, &kp->id, sizeof(up->id));
1564                 up->family = kp->encap_family;
1565                 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1566                 up->reqid = kp->reqid;
1567                 up->mode = kp->mode;
1568                 up->share = kp->share;
1569                 up->optional = kp->optional;
1570                 up->aalgos = kp->aalgos;
1571                 up->ealgos = kp->ealgos;
1572                 up->calgos = kp->calgos;
1573         }
1574 
1575         return nla_put(skb, XFRMA_TMPL,
1576                        sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1577 }
1578 
1579 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1580 {
1581         if (x->security) {
1582                 return copy_sec_ctx(x->security, skb);
1583         }
1584         return 0;
1585 }
1586 
1587 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1588 {
1589         if (xp->security)
1590                 return copy_sec_ctx(xp->security, skb);
1591         return 0;
1592 }
1593 static inline size_t userpolicy_type_attrsize(void)
1594 {
1595 #ifdef CONFIG_XFRM_SUB_POLICY
1596         return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1597 #else
1598         return 0;
1599 #endif
1600 }
1601 
1602 #ifdef CONFIG_XFRM_SUB_POLICY
1603 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1604 {
1605         struct xfrm_userpolicy_type upt = {
1606                 .type = type,
1607         };
1608 
1609         return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1610 }
1611 
1612 #else
1613 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1614 {
1615         return 0;
1616 }
1617 #endif
1618 
1619 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1620 {
1621         struct xfrm_dump_info *sp = ptr;
1622         struct xfrm_userpolicy_info *p;
1623         struct sk_buff *in_skb = sp->in_skb;
1624         struct sk_buff *skb = sp->out_skb;
1625         struct nlmsghdr *nlh;
1626         int err;
1627 
1628         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1629                         XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1630         if (nlh == NULL)
1631                 return -EMSGSIZE;
1632 
1633         p = nlmsg_data(nlh);
1634         copy_to_user_policy(xp, p, dir);
1635         err = copy_to_user_tmpl(xp, skb);
1636         if (!err)
1637                 err = copy_to_user_sec_ctx(xp, skb);
1638         if (!err)
1639                 err = copy_to_user_policy_type(xp->type, skb);
1640         if (!err)
1641                 err = xfrm_mark_put(skb, &xp->mark);
1642         if (err) {
1643                 nlmsg_cancel(skb, nlh);
1644                 return err;
1645         }
1646         nlmsg_end(skb, nlh);
1647         return 0;
1648 }
1649 
1650 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1651 {
1652         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1653         struct net *net = sock_net(cb->skb->sk);
1654 
1655         xfrm_policy_walk_done(walk, net);
1656         return 0;
1657 }
1658 
1659 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1660 {
1661         struct net *net = sock_net(skb->sk);
1662         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1663         struct xfrm_dump_info info;
1664 
1665         BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1666                      sizeof(cb->args) - sizeof(cb->args[0]));
1667 
1668         info.in_skb = cb->skb;
1669         info.out_skb = skb;
1670         info.nlmsg_seq = cb->nlh->nlmsg_seq;
1671         info.nlmsg_flags = NLM_F_MULTI;
1672 
1673         if (!cb->args[0]) {
1674                 cb->args[0] = 1;
1675                 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1676         }
1677 
1678         (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1679 
1680         return skb->len;
1681 }
1682 
1683 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1684                                           struct xfrm_policy *xp,
1685                                           int dir, u32 seq)
1686 {
1687         struct xfrm_dump_info info;
1688         struct sk_buff *skb;
1689         int err;
1690 
1691         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1692         if (!skb)
1693                 return ERR_PTR(-ENOMEM);
1694 
1695         info.in_skb = in_skb;
1696         info.out_skb = skb;
1697         info.nlmsg_seq = seq;
1698         info.nlmsg_flags = 0;
1699 
1700         err = dump_one_policy(xp, dir, 0, &info);
1701         if (err) {
1702                 kfree_skb(skb);
1703                 return ERR_PTR(err);
1704         }
1705 
1706         return skb;
1707 }
1708 
1709 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1710                 struct nlattr **attrs)
1711 {
1712         struct net *net = sock_net(skb->sk);
1713         struct xfrm_policy *xp;
1714         struct xfrm_userpolicy_id *p;
1715         u8 type = XFRM_POLICY_TYPE_MAIN;
1716         int err;
1717         struct km_event c;
1718         int delete;
1719         struct xfrm_mark m;
1720         u32 mark = xfrm_mark_get(attrs, &m);
1721 
1722         p = nlmsg_data(nlh);
1723         delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1724 
1725         err = copy_from_user_policy_type(&type, attrs);
1726         if (err)
1727                 return err;
1728 
1729         err = verify_policy_dir(p->dir);
1730         if (err)
1731                 return err;
1732 
1733         if (p->index)
1734                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1735         else {
1736                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1737                 struct xfrm_sec_ctx *ctx;
1738 
1739                 err = verify_sec_ctx_len(attrs);
1740                 if (err)
1741                         return err;
1742 
1743                 ctx = NULL;
1744                 if (rt) {
1745                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1746 
1747                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1748                         if (err)
1749                                 return err;
1750                 }
1751                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1752                                            ctx, delete, &err);
1753                 security_xfrm_policy_free(ctx);
1754         }
1755         if (xp == NULL)
1756                 return -ENOENT;
1757 
1758         if (!delete) {
1759                 struct sk_buff *resp_skb;
1760 
1761                 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1762                 if (IS_ERR(resp_skb)) {
1763                         err = PTR_ERR(resp_skb);
1764                 } else {
1765                         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1766                                             NETLINK_CB(skb).portid);
1767                 }
1768         } else {
1769                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1770 
1771                 if (err != 0)
1772                         goto out;
1773 
1774                 c.data.byid = p->index;
1775                 c.event = nlh->nlmsg_type;
1776                 c.seq = nlh->nlmsg_seq;
1777                 c.portid = nlh->nlmsg_pid;
1778                 km_policy_notify(xp, p->dir, &c);
1779         }
1780 
1781 out:
1782         xfrm_pol_put(xp);
1783         if (delete && err == 0)
1784                 xfrm_garbage_collect(net);
1785         return err;
1786 }
1787 
1788 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1789                 struct nlattr **attrs)
1790 {
1791         struct net *net = sock_net(skb->sk);
1792         struct km_event c;
1793         struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1794         int err;
1795 
1796         err = xfrm_state_flush(net, p->proto, true);
1797         if (err) {
1798                 if (err == -ESRCH) /* empty table */
1799                         return 0;
1800                 return err;
1801         }
1802         c.data.proto = p->proto;
1803         c.event = nlh->nlmsg_type;
1804         c.seq = nlh->nlmsg_seq;
1805         c.portid = nlh->nlmsg_pid;
1806         c.net = net;
1807         km_state_notify(NULL, &c);
1808 
1809         return 0;
1810 }
1811 
1812 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1813 {
1814         size_t replay_size = x->replay_esn ?
1815                               xfrm_replay_state_esn_len(x->replay_esn) :
1816                               sizeof(struct xfrm_replay_state);
1817 
1818         return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1819                + nla_total_size(replay_size)
1820                + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1821                + nla_total_size(sizeof(struct xfrm_mark))
1822                + nla_total_size(4) /* XFRM_AE_RTHR */
1823                + nla_total_size(4); /* XFRM_AE_ETHR */
1824 }
1825 
1826 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1827 {
1828         struct xfrm_aevent_id *id;
1829         struct nlmsghdr *nlh;
1830         int err;
1831 
1832         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1833         if (nlh == NULL)
1834                 return -EMSGSIZE;
1835 
1836         id = nlmsg_data(nlh);
1837         memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1838         id->sa_id.spi = x->id.spi;
1839         id->sa_id.family = x->props.family;
1840         id->sa_id.proto = x->id.proto;
1841         memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1842         id->reqid = x->props.reqid;
1843         id->flags = c->data.aevent;
1844 
1845         if (x->replay_esn) {
1846                 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1847                               xfrm_replay_state_esn_len(x->replay_esn),
1848                               x->replay_esn);
1849         } else {
1850                 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1851                               &x->replay);
1852         }
1853         if (err)
1854                 goto out_cancel;
1855         err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1856                             XFRMA_PAD);
1857         if (err)
1858                 goto out_cancel;
1859 
1860         if (id->flags & XFRM_AE_RTHR) {
1861                 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1862                 if (err)
1863                         goto out_cancel;
1864         }
1865         if (id->flags & XFRM_AE_ETHR) {
1866                 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1867                                   x->replay_maxage * 10 / HZ);
1868                 if (err)
1869                         goto out_cancel;
1870         }
1871         err = xfrm_mark_put(skb, &x->mark);
1872         if (err)
1873                 goto out_cancel;
1874 
1875         nlmsg_end(skb, nlh);
1876         return 0;
1877 
1878 out_cancel:
1879         nlmsg_cancel(skb, nlh);
1880         return err;
1881 }
1882 
1883 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1884                 struct nlattr **attrs)
1885 {
1886         struct net *net = sock_net(skb->sk);
1887         struct xfrm_state *x;
1888         struct sk_buff *r_skb;
1889         int err;
1890         struct km_event c;
1891         u32 mark;
1892         struct xfrm_mark m;
1893         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1894         struct xfrm_usersa_id *id = &p->sa_id;
1895 
1896         mark = xfrm_mark_get(attrs, &m);
1897 
1898         x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1899         if (x == NULL)
1900                 return -ESRCH;
1901 
1902         r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1903         if (r_skb == NULL) {
1904                 xfrm_state_put(x);
1905                 return -ENOMEM;
1906         }
1907 
1908         /*
1909          * XXX: is this lock really needed - none of the other
1910          * gets lock (the concern is things getting updated
1911          * while we are still reading) - jhs
1912         */
1913         spin_lock_bh(&x->lock);
1914         c.data.aevent = p->flags;
1915         c.seq = nlh->nlmsg_seq;
1916         c.portid = nlh->nlmsg_pid;
1917 
1918         if (build_aevent(r_skb, x, &c) < 0)
1919                 BUG();
1920         err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1921         spin_unlock_bh(&x->lock);
1922         xfrm_state_put(x);
1923         return err;
1924 }
1925 
1926 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1927                 struct nlattr **attrs)
1928 {
1929         struct net *net = sock_net(skb->sk);
1930         struct xfrm_state *x;
1931         struct km_event c;
1932         int err = -EINVAL;
1933         u32 mark = 0;
1934         struct xfrm_mark m;
1935         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1936         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1937         struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1938         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1939         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1940         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
1941 
1942         if (!lt && !rp && !re && !et && !rt)
1943                 return err;
1944 
1945         /* pedantic mode - thou shalt sayeth replaceth */
1946         if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1947                 return err;
1948 
1949         mark = xfrm_mark_get(attrs, &m);
1950 
1951         x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1952         if (x == NULL)
1953                 return -ESRCH;
1954 
1955         if (x->km.state != XFRM_STATE_VALID)
1956                 goto out;
1957 
1958         err = xfrm_replay_verify_len(x->replay_esn, re);
1959         if (err)
1960                 goto out;
1961 
1962         spin_lock_bh(&x->lock);
1963         xfrm_update_ae_params(x, attrs, 1);
1964         spin_unlock_bh(&x->lock);
1965 
1966         c.event = nlh->nlmsg_type;
1967         c.seq = nlh->nlmsg_seq;
1968         c.portid = nlh->nlmsg_pid;
1969         c.data.aevent = XFRM_AE_CU;
1970         km_state_notify(x, &c);
1971         err = 0;
1972 out:
1973         xfrm_state_put(x);
1974         return err;
1975 }
1976 
1977 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1978                 struct nlattr **attrs)
1979 {
1980         struct net *net = sock_net(skb->sk);
1981         struct km_event c;
1982         u8 type = XFRM_POLICY_TYPE_MAIN;
1983         int err;
1984 
1985         err = copy_from_user_policy_type(&type, attrs);
1986         if (err)
1987                 return err;
1988 
1989         err = xfrm_policy_flush(net, type, true);
1990         if (err) {
1991                 if (err == -ESRCH) /* empty table */
1992                         return 0;
1993                 return err;
1994         }
1995 
1996         c.data.type = type;
1997         c.event = nlh->nlmsg_type;
1998         c.seq = nlh->nlmsg_seq;
1999         c.portid = nlh->nlmsg_pid;
2000         c.net = net;
2001         km_policy_notify(NULL, 0, &c);
2002         return 0;
2003 }
2004 
2005 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2006                 struct nlattr **attrs)
2007 {
2008         struct net *net = sock_net(skb->sk);
2009         struct xfrm_policy *xp;
2010         struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2011         struct xfrm_userpolicy_info *p = &up->pol;
2012         u8 type = XFRM_POLICY_TYPE_MAIN;
2013         int err = -ENOENT;
2014         struct xfrm_mark m;
2015         u32 mark = xfrm_mark_get(attrs, &m);
2016 
2017         err = copy_from_user_policy_type(&type, attrs);
2018         if (err)
2019                 return err;
2020 
2021         err = verify_policy_dir(p->dir);
2022         if (err)
2023                 return err;
2024 
2025         if (p->index)
2026                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2027         else {
2028                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2029                 struct xfrm_sec_ctx *ctx;
2030 
2031                 err = verify_sec_ctx_len(attrs);
2032                 if (err)
2033                         return err;
2034 
2035                 ctx = NULL;
2036                 if (rt) {
2037                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2038 
2039                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2040                         if (err)
2041                                 return err;
2042                 }
2043                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2044                                            &p->sel, ctx, 0, &err);
2045                 security_xfrm_policy_free(ctx);
2046         }
2047         if (xp == NULL)
2048                 return -ENOENT;
2049 
2050         if (unlikely(xp->walk.dead))
2051                 goto out;
2052 
2053         err = 0;
2054         if (up->hard) {
2055                 xfrm_policy_delete(xp, p->dir);
2056                 xfrm_audit_policy_delete(xp, 1, true);
2057         }
2058         km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2059 
2060 out:
2061         xfrm_pol_put(xp);
2062         return err;
2063 }
2064 
2065 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2066                 struct nlattr **attrs)
2067 {
2068         struct net *net = sock_net(skb->sk);
2069         struct xfrm_state *x;
2070         int err;
2071         struct xfrm_user_expire *ue = nlmsg_data(nlh);
2072         struct xfrm_usersa_info *p = &ue->state;
2073         struct xfrm_mark m;
2074         u32 mark = xfrm_mark_get(attrs, &m);
2075 
2076         x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2077 
2078         err = -ENOENT;
2079         if (x == NULL)
2080                 return err;
2081 
2082         spin_lock_bh(&x->lock);
2083         err = -EINVAL;
2084         if (x->km.state != XFRM_STATE_VALID)
2085                 goto out;
2086         km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2087 
2088         if (ue->hard) {
2089                 __xfrm_state_delete(x);
2090                 xfrm_audit_state_delete(x, 1, true);
2091         }
2092         err = 0;
2093 out:
2094         spin_unlock_bh(&x->lock);
2095         xfrm_state_put(x);
2096         return err;
2097 }
2098 
2099 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2100                 struct nlattr **attrs)
2101 {
2102         struct net *net = sock_net(skb->sk);
2103         struct xfrm_policy *xp;
2104         struct xfrm_user_tmpl *ut;
2105         int i;
2106         struct nlattr *rt = attrs[XFRMA_TMPL];
2107         struct xfrm_mark mark;
2108 
2109         struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2110         struct xfrm_state *x = xfrm_state_alloc(net);
2111         int err = -ENOMEM;
2112 
2113         if (!x)
2114                 goto nomem;
2115 
2116         xfrm_mark_get(attrs, &mark);
2117 
2118         err = verify_newpolicy_info(&ua->policy);
2119         if (err)
2120                 goto free_state;
2121 
2122         /*   build an XP */
2123         xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2124         if (!xp)
2125                 goto free_state;
2126 
2127         memcpy(&x->id, &ua->id, sizeof(ua->id));
2128         memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2129         memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2130         xp->mark.m = x->mark.m = mark.m;
2131         xp->mark.v = x->mark.v = mark.v;
2132         ut = nla_data(rt);
2133         /* extract the templates and for each call km_key */
2134         for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2135                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2136                 memcpy(&x->id, &t->id, sizeof(x->id));
2137                 x->props.mode = t->mode;
2138                 x->props.reqid = t->reqid;
2139                 x->props.family = ut->family;
2140                 t->aalgos = ua->aalgos;
2141                 t->ealgos = ua->ealgos;
2142                 t->calgos = ua->calgos;
2143                 err = km_query(x, t, xp);
2144 
2145         }
2146 
2147         kfree(x);
2148         kfree(xp);
2149 
2150         return 0;
2151 
2152 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_64bit(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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