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TOMOYO Linux Cross Reference
Linux/net/xfrm/xfrm_user.c

Version: ~ [ linux-5.5 ] ~ [ linux-5.4.15 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.98 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.167 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.211 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.211 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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 <linux/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) < (int)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[sizeof(algp->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) < (int)xfrm_alg_auth_len(algp))
 72                 return -EINVAL;
 73 
 74         algp->alg_name[sizeof(algp->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) < (int)aead_len(algp))
 88                 return -EINVAL;
 89 
 90         algp->alg_name[sizeof(algp->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 (!rt)
125                 return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;
126 
127         rs = nla_data(rt);
128 
129         if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130                 return -EINVAL;
131 
132         if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
133             nla_len(rt) != sizeof(*rs))
134                 return -EINVAL;
135 
136         /* As only ESP and AH support ESN feature. */
137         if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
138                 return -EINVAL;
139 
140         if (p->replay_window != 0)
141                 return -EINVAL;
142 
143         return 0;
144 }
145 
146 static int verify_newsa_info(struct xfrm_usersa_info *p,
147                              struct nlattr **attrs)
148 {
149         int err;
150 
151         err = -EINVAL;
152         switch (p->family) {
153         case AF_INET:
154                 break;
155 
156         case AF_INET6:
157 #if IS_ENABLED(CONFIG_IPV6)
158                 break;
159 #else
160                 err = -EAFNOSUPPORT;
161                 goto out;
162 #endif
163 
164         default:
165                 goto out;
166         }
167 
168         err = -EINVAL;
169         switch (p->id.proto) {
170         case IPPROTO_AH:
171                 if ((!attrs[XFRMA_ALG_AUTH]     &&
172                      !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
173                     attrs[XFRMA_ALG_AEAD]       ||
174                     attrs[XFRMA_ALG_CRYPT]      ||
175                     attrs[XFRMA_ALG_COMP]       ||
176                     attrs[XFRMA_TFCPAD])
177                         goto out;
178                 break;
179 
180         case IPPROTO_ESP:
181                 if (attrs[XFRMA_ALG_COMP])
182                         goto out;
183                 if (!attrs[XFRMA_ALG_AUTH] &&
184                     !attrs[XFRMA_ALG_AUTH_TRUNC] &&
185                     !attrs[XFRMA_ALG_CRYPT] &&
186                     !attrs[XFRMA_ALG_AEAD])
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_TFCPAD] &&
194                     p->mode != XFRM_MODE_TUNNEL)
195                         goto out;
196                 break;
197 
198         case IPPROTO_COMP:
199                 if (!attrs[XFRMA_ALG_COMP]      ||
200                     attrs[XFRMA_ALG_AEAD]       ||
201                     attrs[XFRMA_ALG_AUTH]       ||
202                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
203                     attrs[XFRMA_ALG_CRYPT]      ||
204                     attrs[XFRMA_TFCPAD]         ||
205                     (ntohl(p->id.spi) >= 0x10000))
206                         goto out;
207                 break;
208 
209 #if IS_ENABLED(CONFIG_IPV6)
210         case IPPROTO_DSTOPTS:
211         case IPPROTO_ROUTING:
212                 if (attrs[XFRMA_ALG_COMP]       ||
213                     attrs[XFRMA_ALG_AUTH]       ||
214                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
215                     attrs[XFRMA_ALG_AEAD]       ||
216                     attrs[XFRMA_ALG_CRYPT]      ||
217                     attrs[XFRMA_ENCAP]          ||
218                     attrs[XFRMA_SEC_CTX]        ||
219                     attrs[XFRMA_TFCPAD]         ||
220                     !attrs[XFRMA_COADDR])
221                         goto out;
222                 break;
223 #endif
224 
225         default:
226                 goto out;
227         }
228 
229         if ((err = verify_aead(attrs)))
230                 goto out;
231         if ((err = verify_auth_trunc(attrs)))
232                 goto out;
233         if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
234                 goto out;
235         if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
236                 goto out;
237         if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
238                 goto out;
239         if ((err = verify_sec_ctx_len(attrs)))
240                 goto out;
241         if ((err = verify_replay(p, attrs)))
242                 goto out;
243 
244         err = -EINVAL;
245         switch (p->mode) {
246         case XFRM_MODE_TRANSPORT:
247         case XFRM_MODE_TUNNEL:
248         case XFRM_MODE_ROUTEOPTIMIZATION:
249         case XFRM_MODE_BEET:
250                 break;
251 
252         default:
253                 goto out;
254         }
255 
256         err = 0;
257 
258 out:
259         return err;
260 }
261 
262 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
263                            struct xfrm_algo_desc *(*get_byname)(const char *, int),
264                            struct nlattr *rta)
265 {
266         struct xfrm_algo *p, *ualg;
267         struct xfrm_algo_desc *algo;
268 
269         if (!rta)
270                 return 0;
271 
272         ualg = nla_data(rta);
273 
274         algo = get_byname(ualg->alg_name, 1);
275         if (!algo)
276                 return -ENOSYS;
277         *props = algo->desc.sadb_alg_id;
278 
279         p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
280         if (!p)
281                 return -ENOMEM;
282 
283         strcpy(p->alg_name, algo->name);
284         *algpp = p;
285         return 0;
286 }
287 
288 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
289 {
290         struct xfrm_algo *p, *ualg;
291         struct xfrm_algo_desc *algo;
292 
293         if (!rta)
294                 return 0;
295 
296         ualg = nla_data(rta);
297 
298         algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
299         if (!algo)
300                 return -ENOSYS;
301         x->props.ealgo = algo->desc.sadb_alg_id;
302 
303         p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
304         if (!p)
305                 return -ENOMEM;
306 
307         strcpy(p->alg_name, algo->name);
308         x->ealg = p;
309         x->geniv = algo->uinfo.encr.geniv;
310         return 0;
311 }
312 
313 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
314                        struct nlattr *rta)
315 {
316         struct xfrm_algo *ualg;
317         struct xfrm_algo_auth *p;
318         struct xfrm_algo_desc *algo;
319 
320         if (!rta)
321                 return 0;
322 
323         ualg = nla_data(rta);
324 
325         algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
326         if (!algo)
327                 return -ENOSYS;
328         *props = algo->desc.sadb_alg_id;
329 
330         p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
331         if (!p)
332                 return -ENOMEM;
333 
334         strcpy(p->alg_name, algo->name);
335         p->alg_key_len = ualg->alg_key_len;
336         p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
337         memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
338 
339         *algpp = p;
340         return 0;
341 }
342 
343 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
344                              struct nlattr *rta)
345 {
346         struct xfrm_algo_auth *p, *ualg;
347         struct xfrm_algo_desc *algo;
348 
349         if (!rta)
350                 return 0;
351 
352         ualg = nla_data(rta);
353 
354         algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
355         if (!algo)
356                 return -ENOSYS;
357         if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
358                 return -EINVAL;
359         *props = algo->desc.sadb_alg_id;
360 
361         p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
362         if (!p)
363                 return -ENOMEM;
364 
365         strcpy(p->alg_name, algo->name);
366         if (!p->alg_trunc_len)
367                 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
368 
369         *algpp = p;
370         return 0;
371 }
372 
373 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
374 {
375         struct xfrm_algo_aead *p, *ualg;
376         struct xfrm_algo_desc *algo;
377 
378         if (!rta)
379                 return 0;
380 
381         ualg = nla_data(rta);
382 
383         algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
384         if (!algo)
385                 return -ENOSYS;
386         x->props.ealgo = algo->desc.sadb_alg_id;
387 
388         p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
389         if (!p)
390                 return -ENOMEM;
391 
392         strcpy(p->alg_name, algo->name);
393         x->aead = p;
394         x->geniv = algo->uinfo.aead.geniv;
395         return 0;
396 }
397 
398 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
399                                          struct nlattr *rp)
400 {
401         struct xfrm_replay_state_esn *up;
402         unsigned int ulen;
403 
404         if (!replay_esn || !rp)
405                 return 0;
406 
407         up = nla_data(rp);
408         ulen = xfrm_replay_state_esn_len(up);
409 
410         /* Check the overall length and the internal bitmap length to avoid
411          * potential overflow. */
412         if (nla_len(rp) < (int)ulen ||
413             xfrm_replay_state_esn_len(replay_esn) != ulen ||
414             replay_esn->bmp_len != up->bmp_len)
415                 return -EINVAL;
416 
417         if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
418                 return -EINVAL;
419 
420         return 0;
421 }
422 
423 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
424                                        struct xfrm_replay_state_esn **preplay_esn,
425                                        struct nlattr *rta)
426 {
427         struct xfrm_replay_state_esn *p, *pp, *up;
428         unsigned int klen, ulen;
429 
430         if (!rta)
431                 return 0;
432 
433         up = nla_data(rta);
434         klen = xfrm_replay_state_esn_len(up);
435         ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up);
436 
437         p = kzalloc(klen, GFP_KERNEL);
438         if (!p)
439                 return -ENOMEM;
440 
441         pp = kzalloc(klen, GFP_KERNEL);
442         if (!pp) {
443                 kfree(p);
444                 return -ENOMEM;
445         }
446 
447         memcpy(p, up, ulen);
448         memcpy(pp, up, ulen);
449 
450         *replay_esn = p;
451         *preplay_esn = pp;
452 
453         return 0;
454 }
455 
456 static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
457 {
458         unsigned int len = 0;
459 
460         if (xfrm_ctx) {
461                 len += sizeof(struct xfrm_user_sec_ctx);
462                 len += xfrm_ctx->ctx_len;
463         }
464         return len;
465 }
466 
467 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
468 {
469         memcpy(&x->id, &p->id, sizeof(x->id));
470         memcpy(&x->sel, &p->sel, sizeof(x->sel));
471         memcpy(&x->lft, &p->lft, sizeof(x->lft));
472         x->props.mode = p->mode;
473         x->props.replay_window = min_t(unsigned int, p->replay_window,
474                                         sizeof(x->replay.bitmap) * 8);
475         x->props.reqid = p->reqid;
476         x->props.family = p->family;
477         memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
478         x->props.flags = p->flags;
479 
480         if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
481                 x->sel.family = p->family;
482 }
483 
484 /*
485  * someday when pfkey also has support, we could have the code
486  * somehow made shareable and move it to xfrm_state.c - JHS
487  *
488 */
489 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
490                                   int update_esn)
491 {
492         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
493         struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
494         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
495         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
496         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
497 
498         if (re) {
499                 struct xfrm_replay_state_esn *replay_esn;
500                 replay_esn = nla_data(re);
501                 memcpy(x->replay_esn, replay_esn,
502                        xfrm_replay_state_esn_len(replay_esn));
503                 memcpy(x->preplay_esn, replay_esn,
504                        xfrm_replay_state_esn_len(replay_esn));
505         }
506 
507         if (rp) {
508                 struct xfrm_replay_state *replay;
509                 replay = nla_data(rp);
510                 memcpy(&x->replay, replay, sizeof(*replay));
511                 memcpy(&x->preplay, replay, sizeof(*replay));
512         }
513 
514         if (lt) {
515                 struct xfrm_lifetime_cur *ltime;
516                 ltime = nla_data(lt);
517                 x->curlft.bytes = ltime->bytes;
518                 x->curlft.packets = ltime->packets;
519                 x->curlft.add_time = ltime->add_time;
520                 x->curlft.use_time = ltime->use_time;
521         }
522 
523         if (et)
524                 x->replay_maxage = nla_get_u32(et);
525 
526         if (rt)
527                 x->replay_maxdiff = nla_get_u32(rt);
528 }
529 
530 static struct xfrm_state *xfrm_state_construct(struct net *net,
531                                                struct xfrm_usersa_info *p,
532                                                struct nlattr **attrs,
533                                                int *errp)
534 {
535         struct xfrm_state *x = xfrm_state_alloc(net);
536         int err = -ENOMEM;
537 
538         if (!x)
539                 goto error_no_put;
540 
541         copy_from_user_state(x, p);
542 
543         if (attrs[XFRMA_SA_EXTRA_FLAGS])
544                 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
545 
546         if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
547                 goto error;
548         if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
549                                      attrs[XFRMA_ALG_AUTH_TRUNC])))
550                 goto error;
551         if (!x->props.aalgo) {
552                 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
553                                        attrs[XFRMA_ALG_AUTH])))
554                         goto error;
555         }
556         if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
557                 goto error;
558         if ((err = attach_one_algo(&x->calg, &x->props.calgo,
559                                    xfrm_calg_get_byname,
560                                    attrs[XFRMA_ALG_COMP])))
561                 goto error;
562 
563         if (attrs[XFRMA_ENCAP]) {
564                 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
565                                    sizeof(*x->encap), GFP_KERNEL);
566                 if (x->encap == NULL)
567                         goto error;
568         }
569 
570         if (attrs[XFRMA_TFCPAD])
571                 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
572 
573         if (attrs[XFRMA_COADDR]) {
574                 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
575                                     sizeof(*x->coaddr), GFP_KERNEL);
576                 if (x->coaddr == NULL)
577                         goto error;
578         }
579 
580         xfrm_mark_get(attrs, &x->mark);
581 
582         if (attrs[XFRMA_OUTPUT_MARK])
583                 x->props.output_mark = nla_get_u32(attrs[XFRMA_OUTPUT_MARK]);
584 
585         err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV]);
586         if (err)
587                 goto error;
588 
589         if (attrs[XFRMA_SEC_CTX]) {
590                 err = security_xfrm_state_alloc(x,
591                                                 nla_data(attrs[XFRMA_SEC_CTX]));
592                 if (err)
593                         goto error;
594         }
595 
596         if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
597                                                attrs[XFRMA_REPLAY_ESN_VAL])))
598                 goto error;
599 
600         x->km.seq = p->seq;
601         x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
602         /* sysctl_xfrm_aevent_etime is in 100ms units */
603         x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
604 
605         if ((err = xfrm_init_replay(x)))
606                 goto error;
607 
608         /* override default values from above */
609         xfrm_update_ae_params(x, attrs, 0);
610 
611         /* configure the hardware if offload is requested */
612         if (attrs[XFRMA_OFFLOAD_DEV]) {
613                 err = xfrm_dev_state_add(net, x,
614                                          nla_data(attrs[XFRMA_OFFLOAD_DEV]));
615                 if (err)
616                         goto error;
617         }
618 
619         return x;
620 
621 error:
622         x->km.state = XFRM_STATE_DEAD;
623         xfrm_state_put(x);
624 error_no_put:
625         *errp = err;
626         return NULL;
627 }
628 
629 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
630                 struct nlattr **attrs)
631 {
632         struct net *net = sock_net(skb->sk);
633         struct xfrm_usersa_info *p = nlmsg_data(nlh);
634         struct xfrm_state *x;
635         int err;
636         struct km_event c;
637 
638         err = verify_newsa_info(p, attrs);
639         if (err)
640                 return err;
641 
642         x = xfrm_state_construct(net, p, attrs, &err);
643         if (!x)
644                 return err;
645 
646         xfrm_state_hold(x);
647         if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
648                 err = xfrm_state_add(x);
649         else
650                 err = xfrm_state_update(x);
651 
652         xfrm_audit_state_add(x, err ? 0 : 1, true);
653 
654         if (err < 0) {
655                 x->km.state = XFRM_STATE_DEAD;
656                 xfrm_dev_state_delete(x);
657                 __xfrm_state_put(x);
658                 goto out;
659         }
660 
661         if (x->km.state == XFRM_STATE_VOID)
662                 x->km.state = XFRM_STATE_VALID;
663 
664         c.seq = nlh->nlmsg_seq;
665         c.portid = nlh->nlmsg_pid;
666         c.event = nlh->nlmsg_type;
667 
668         km_state_notify(x, &c);
669 out:
670         xfrm_state_put(x);
671         return err;
672 }
673 
674 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
675                                                  struct xfrm_usersa_id *p,
676                                                  struct nlattr **attrs,
677                                                  int *errp)
678 {
679         struct xfrm_state *x = NULL;
680         struct xfrm_mark m;
681         int err;
682         u32 mark = xfrm_mark_get(attrs, &m);
683 
684         if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
685                 err = -ESRCH;
686                 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
687         } else {
688                 xfrm_address_t *saddr = NULL;
689 
690                 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
691                 if (!saddr) {
692                         err = -EINVAL;
693                         goto out;
694                 }
695 
696                 err = -ESRCH;
697                 x = xfrm_state_lookup_byaddr(net, mark,
698                                              &p->daddr, saddr,
699                                              p->proto, p->family);
700         }
701 
702  out:
703         if (!x && errp)
704                 *errp = err;
705         return x;
706 }
707 
708 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
709                 struct nlattr **attrs)
710 {
711         struct net *net = sock_net(skb->sk);
712         struct xfrm_state *x;
713         int err = -ESRCH;
714         struct km_event c;
715         struct xfrm_usersa_id *p = nlmsg_data(nlh);
716 
717         x = xfrm_user_state_lookup(net, p, attrs, &err);
718         if (x == NULL)
719                 return err;
720 
721         if ((err = security_xfrm_state_delete(x)) != 0)
722                 goto out;
723 
724         if (xfrm_state_kern(x)) {
725                 err = -EPERM;
726                 goto out;
727         }
728 
729         err = xfrm_state_delete(x);
730 
731         if (err < 0)
732                 goto out;
733 
734         c.seq = nlh->nlmsg_seq;
735         c.portid = nlh->nlmsg_pid;
736         c.event = nlh->nlmsg_type;
737         km_state_notify(x, &c);
738 
739 out:
740         xfrm_audit_state_delete(x, err ? 0 : 1, true);
741         xfrm_state_put(x);
742         return err;
743 }
744 
745 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
746 {
747         memset(p, 0, sizeof(*p));
748         memcpy(&p->id, &x->id, sizeof(p->id));
749         memcpy(&p->sel, &x->sel, sizeof(p->sel));
750         memcpy(&p->lft, &x->lft, sizeof(p->lft));
751         memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
752         put_unaligned(x->stats.replay_window, &p->stats.replay_window);
753         put_unaligned(x->stats.replay, &p->stats.replay);
754         put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
755         memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
756         p->mode = x->props.mode;
757         p->replay_window = x->props.replay_window;
758         p->reqid = x->props.reqid;
759         p->family = x->props.family;
760         p->flags = x->props.flags;
761         p->seq = x->km.seq;
762 }
763 
764 struct xfrm_dump_info {
765         struct sk_buff *in_skb;
766         struct sk_buff *out_skb;
767         u32 nlmsg_seq;
768         u16 nlmsg_flags;
769 };
770 
771 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
772 {
773         struct xfrm_user_sec_ctx *uctx;
774         struct nlattr *attr;
775         int ctx_size = sizeof(*uctx) + s->ctx_len;
776 
777         attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
778         if (attr == NULL)
779                 return -EMSGSIZE;
780 
781         uctx = nla_data(attr);
782         uctx->exttype = XFRMA_SEC_CTX;
783         uctx->len = ctx_size;
784         uctx->ctx_doi = s->ctx_doi;
785         uctx->ctx_alg = s->ctx_alg;
786         uctx->ctx_len = s->ctx_len;
787         memcpy(uctx + 1, s->ctx_str, s->ctx_len);
788 
789         return 0;
790 }
791 
792 static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb)
793 {
794         struct xfrm_user_offload *xuo;
795         struct nlattr *attr;
796 
797         attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo));
798         if (attr == NULL)
799                 return -EMSGSIZE;
800 
801         xuo = nla_data(attr);
802         memset(xuo, 0, sizeof(*xuo));
803         xuo->ifindex = xso->dev->ifindex;
804         xuo->flags = xso->flags;
805 
806         return 0;
807 }
808 
809 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
810 {
811         struct xfrm_algo *algo;
812         struct nlattr *nla;
813 
814         nla = nla_reserve(skb, XFRMA_ALG_AUTH,
815                           sizeof(*algo) + (auth->alg_key_len + 7) / 8);
816         if (!nla)
817                 return -EMSGSIZE;
818 
819         algo = nla_data(nla);
820         strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
821         memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
822         algo->alg_key_len = auth->alg_key_len;
823 
824         return 0;
825 }
826 
827 /* Don't change this without updating xfrm_sa_len! */
828 static int copy_to_user_state_extra(struct xfrm_state *x,
829                                     struct xfrm_usersa_info *p,
830                                     struct sk_buff *skb)
831 {
832         int ret = 0;
833 
834         copy_to_user_state(x, p);
835 
836         if (x->props.extra_flags) {
837                 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
838                                   x->props.extra_flags);
839                 if (ret)
840                         goto out;
841         }
842 
843         if (x->coaddr) {
844                 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
845                 if (ret)
846                         goto out;
847         }
848         if (x->lastused) {
849                 ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused,
850                                         XFRMA_PAD);
851                 if (ret)
852                         goto out;
853         }
854         if (x->aead) {
855                 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
856                 if (ret)
857                         goto out;
858         }
859         if (x->aalg) {
860                 ret = copy_to_user_auth(x->aalg, skb);
861                 if (!ret)
862                         ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
863                                       xfrm_alg_auth_len(x->aalg), x->aalg);
864                 if (ret)
865                         goto out;
866         }
867         if (x->ealg) {
868                 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
869                 if (ret)
870                         goto out;
871         }
872         if (x->calg) {
873                 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
874                 if (ret)
875                         goto out;
876         }
877         if (x->encap) {
878                 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
879                 if (ret)
880                         goto out;
881         }
882         if (x->tfcpad) {
883                 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
884                 if (ret)
885                         goto out;
886         }
887         ret = xfrm_mark_put(skb, &x->mark);
888         if (ret)
889                 goto out;
890         if (x->replay_esn)
891                 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
892                               xfrm_replay_state_esn_len(x->replay_esn),
893                               x->replay_esn);
894         else
895                 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
896                               &x->replay);
897         if (ret)
898                 goto out;
899         if(x->xso.dev)
900                 ret = copy_user_offload(&x->xso, skb);
901         if (ret)
902                 goto out;
903         if (x->props.output_mark) {
904                 ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
905                 if (ret)
906                         goto out;
907         }
908         if (x->security)
909                 ret = copy_sec_ctx(x->security, skb);
910 out:
911         return ret;
912 }
913 
914 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
915 {
916         struct xfrm_dump_info *sp = ptr;
917         struct sk_buff *in_skb = sp->in_skb;
918         struct sk_buff *skb = sp->out_skb;
919         struct xfrm_usersa_info *p;
920         struct nlmsghdr *nlh;
921         int err;
922 
923         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
924                         XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
925         if (nlh == NULL)
926                 return -EMSGSIZE;
927 
928         p = nlmsg_data(nlh);
929 
930         err = copy_to_user_state_extra(x, p, skb);
931         if (err) {
932                 nlmsg_cancel(skb, nlh);
933                 return err;
934         }
935         nlmsg_end(skb, nlh);
936         return 0;
937 }
938 
939 static int xfrm_dump_sa_done(struct netlink_callback *cb)
940 {
941         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
942         struct sock *sk = cb->skb->sk;
943         struct net *net = sock_net(sk);
944 
945         if (cb->args[0])
946                 xfrm_state_walk_done(walk, net);
947         return 0;
948 }
949 
950 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
951 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
952 {
953         struct net *net = sock_net(skb->sk);
954         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
955         struct xfrm_dump_info info;
956 
957         BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
958                      sizeof(cb->args) - sizeof(cb->args[0]));
959 
960         info.in_skb = cb->skb;
961         info.out_skb = skb;
962         info.nlmsg_seq = cb->nlh->nlmsg_seq;
963         info.nlmsg_flags = NLM_F_MULTI;
964 
965         if (!cb->args[0]) {
966                 struct nlattr *attrs[XFRMA_MAX+1];
967                 struct xfrm_address_filter *filter = NULL;
968                 u8 proto = 0;
969                 int err;
970 
971                 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy,
972                                   NULL);
973                 if (err < 0)
974                         return err;
975 
976                 if (attrs[XFRMA_ADDRESS_FILTER]) {
977                         filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
978                                          sizeof(*filter), GFP_KERNEL);
979                         if (filter == NULL)
980                                 return -ENOMEM;
981                 }
982 
983                 if (attrs[XFRMA_PROTO])
984                         proto = nla_get_u8(attrs[XFRMA_PROTO]);
985 
986                 xfrm_state_walk_init(walk, proto, filter);
987                 cb->args[0] = 1;
988         }
989 
990         (void) xfrm_state_walk(net, walk, dump_one_state, &info);
991 
992         return skb->len;
993 }
994 
995 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
996                                           struct xfrm_state *x, u32 seq)
997 {
998         struct xfrm_dump_info info;
999         struct sk_buff *skb;
1000         int err;
1001 
1002         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1003         if (!skb)
1004                 return ERR_PTR(-ENOMEM);
1005 
1006         info.in_skb = in_skb;
1007         info.out_skb = skb;
1008         info.nlmsg_seq = seq;
1009         info.nlmsg_flags = 0;
1010 
1011         err = dump_one_state(x, 0, &info);
1012         if (err) {
1013                 kfree_skb(skb);
1014                 return ERR_PTR(err);
1015         }
1016 
1017         return skb;
1018 }
1019 
1020 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
1021  * Must be called with RCU read lock.
1022  */
1023 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
1024                                        u32 pid, unsigned int group)
1025 {
1026         struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
1027 
1028         if (nlsk)
1029                 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
1030         else
1031                 return -1;
1032 }
1033 
1034 static inline unsigned int xfrm_spdinfo_msgsize(void)
1035 {
1036         return NLMSG_ALIGN(4)
1037                + nla_total_size(sizeof(struct xfrmu_spdinfo))
1038                + nla_total_size(sizeof(struct xfrmu_spdhinfo))
1039                + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1040                + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1041 }
1042 
1043 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1044                          u32 portid, u32 seq, u32 flags)
1045 {
1046         struct xfrmk_spdinfo si;
1047         struct xfrmu_spdinfo spc;
1048         struct xfrmu_spdhinfo sph;
1049         struct xfrmu_spdhthresh spt4, spt6;
1050         struct nlmsghdr *nlh;
1051         int err;
1052         u32 *f;
1053         unsigned lseq;
1054 
1055         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1056         if (nlh == NULL) /* shouldn't really happen ... */
1057                 return -EMSGSIZE;
1058 
1059         f = nlmsg_data(nlh);
1060         *f = flags;
1061         xfrm_spd_getinfo(net, &si);
1062         spc.incnt = si.incnt;
1063         spc.outcnt = si.outcnt;
1064         spc.fwdcnt = si.fwdcnt;
1065         spc.inscnt = si.inscnt;
1066         spc.outscnt = si.outscnt;
1067         spc.fwdscnt = si.fwdscnt;
1068         sph.spdhcnt = si.spdhcnt;
1069         sph.spdhmcnt = si.spdhmcnt;
1070 
1071         do {
1072                 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1073 
1074                 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1075                 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1076                 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1077                 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1078         } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1079 
1080         err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1081         if (!err)
1082                 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1083         if (!err)
1084                 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1085         if (!err)
1086                 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1087         if (err) {
1088                 nlmsg_cancel(skb, nlh);
1089                 return err;
1090         }
1091 
1092         nlmsg_end(skb, nlh);
1093         return 0;
1094 }
1095 
1096 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1097                             struct nlattr **attrs)
1098 {
1099         struct net *net = sock_net(skb->sk);
1100         struct xfrmu_spdhthresh *thresh4 = NULL;
1101         struct xfrmu_spdhthresh *thresh6 = NULL;
1102 
1103         /* selector prefixlen thresholds to hash policies */
1104         if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1105                 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1106 
1107                 if (nla_len(rta) < sizeof(*thresh4))
1108                         return -EINVAL;
1109                 thresh4 = nla_data(rta);
1110                 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1111                         return -EINVAL;
1112         }
1113         if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1114                 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1115 
1116                 if (nla_len(rta) < sizeof(*thresh6))
1117                         return -EINVAL;
1118                 thresh6 = nla_data(rta);
1119                 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1120                         return -EINVAL;
1121         }
1122 
1123         if (thresh4 || thresh6) {
1124                 write_seqlock(&net->xfrm.policy_hthresh.lock);
1125                 if (thresh4) {
1126                         net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1127                         net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1128                 }
1129                 if (thresh6) {
1130                         net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1131                         net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1132                 }
1133                 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1134 
1135                 xfrm_policy_hash_rebuild(net);
1136         }
1137 
1138         return 0;
1139 }
1140 
1141 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1142                 struct nlattr **attrs)
1143 {
1144         struct net *net = sock_net(skb->sk);
1145         struct sk_buff *r_skb;
1146         u32 *flags = nlmsg_data(nlh);
1147         u32 sportid = NETLINK_CB(skb).portid;
1148         u32 seq = nlh->nlmsg_seq;
1149         int err;
1150 
1151         r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1152         if (r_skb == NULL)
1153                 return -ENOMEM;
1154 
1155         err = build_spdinfo(r_skb, net, sportid, seq, *flags);
1156         BUG_ON(err < 0);
1157 
1158         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1159 }
1160 
1161 static inline unsigned int xfrm_sadinfo_msgsize(void)
1162 {
1163         return NLMSG_ALIGN(4)
1164                + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1165                + nla_total_size(4); /* XFRMA_SAD_CNT */
1166 }
1167 
1168 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1169                          u32 portid, u32 seq, u32 flags)
1170 {
1171         struct xfrmk_sadinfo si;
1172         struct xfrmu_sadhinfo sh;
1173         struct nlmsghdr *nlh;
1174         int err;
1175         u32 *f;
1176 
1177         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1178         if (nlh == NULL) /* shouldn't really happen ... */
1179                 return -EMSGSIZE;
1180 
1181         f = nlmsg_data(nlh);
1182         *f = flags;
1183         xfrm_sad_getinfo(net, &si);
1184 
1185         sh.sadhmcnt = si.sadhmcnt;
1186         sh.sadhcnt = si.sadhcnt;
1187 
1188         err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1189         if (!err)
1190                 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1191         if (err) {
1192                 nlmsg_cancel(skb, nlh);
1193                 return err;
1194         }
1195 
1196         nlmsg_end(skb, nlh);
1197         return 0;
1198 }
1199 
1200 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1201                 struct nlattr **attrs)
1202 {
1203         struct net *net = sock_net(skb->sk);
1204         struct sk_buff *r_skb;
1205         u32 *flags = nlmsg_data(nlh);
1206         u32 sportid = NETLINK_CB(skb).portid;
1207         u32 seq = nlh->nlmsg_seq;
1208         int err;
1209 
1210         r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1211         if (r_skb == NULL)
1212                 return -ENOMEM;
1213 
1214         err = build_sadinfo(r_skb, net, sportid, seq, *flags);
1215         BUG_ON(err < 0);
1216 
1217         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1218 }
1219 
1220 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1221                 struct nlattr **attrs)
1222 {
1223         struct net *net = sock_net(skb->sk);
1224         struct xfrm_usersa_id *p = nlmsg_data(nlh);
1225         struct xfrm_state *x;
1226         struct sk_buff *resp_skb;
1227         int err = -ESRCH;
1228 
1229         x = xfrm_user_state_lookup(net, p, attrs, &err);
1230         if (x == NULL)
1231                 goto out_noput;
1232 
1233         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1234         if (IS_ERR(resp_skb)) {
1235                 err = PTR_ERR(resp_skb);
1236         } else {
1237                 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1238         }
1239         xfrm_state_put(x);
1240 out_noput:
1241         return err;
1242 }
1243 
1244 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1245                 struct nlattr **attrs)
1246 {
1247         struct net *net = sock_net(skb->sk);
1248         struct xfrm_state *x;
1249         struct xfrm_userspi_info *p;
1250         struct sk_buff *resp_skb;
1251         xfrm_address_t *daddr;
1252         int family;
1253         int err;
1254         u32 mark;
1255         struct xfrm_mark m;
1256 
1257         p = nlmsg_data(nlh);
1258         err = verify_spi_info(p->info.id.proto, p->min, p->max);
1259         if (err)
1260                 goto out_noput;
1261 
1262         family = p->info.family;
1263         daddr = &p->info.id.daddr;
1264 
1265         x = NULL;
1266 
1267         mark = xfrm_mark_get(attrs, &m);
1268         if (p->info.seq) {
1269                 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1270                 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1271                         xfrm_state_put(x);
1272                         x = NULL;
1273                 }
1274         }
1275 
1276         if (!x)
1277                 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1278                                   p->info.id.proto, daddr,
1279                                   &p->info.saddr, 1,
1280                                   family);
1281         err = -ENOENT;
1282         if (x == NULL)
1283                 goto out_noput;
1284 
1285         err = xfrm_alloc_spi(x, p->min, p->max);
1286         if (err)
1287                 goto out;
1288 
1289         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1290         if (IS_ERR(resp_skb)) {
1291                 err = PTR_ERR(resp_skb);
1292                 goto out;
1293         }
1294 
1295         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1296 
1297 out:
1298         xfrm_state_put(x);
1299 out_noput:
1300         return err;
1301 }
1302 
1303 static int verify_policy_dir(u8 dir)
1304 {
1305         switch (dir) {
1306         case XFRM_POLICY_IN:
1307         case XFRM_POLICY_OUT:
1308         case XFRM_POLICY_FWD:
1309                 break;
1310 
1311         default:
1312                 return -EINVAL;
1313         }
1314 
1315         return 0;
1316 }
1317 
1318 static int verify_policy_type(u8 type)
1319 {
1320         switch (type) {
1321         case XFRM_POLICY_TYPE_MAIN:
1322 #ifdef CONFIG_XFRM_SUB_POLICY
1323         case XFRM_POLICY_TYPE_SUB:
1324 #endif
1325                 break;
1326 
1327         default:
1328                 return -EINVAL;
1329         }
1330 
1331         return 0;
1332 }
1333 
1334 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1335 {
1336         int ret;
1337 
1338         switch (p->share) {
1339         case XFRM_SHARE_ANY:
1340         case XFRM_SHARE_SESSION:
1341         case XFRM_SHARE_USER:
1342         case XFRM_SHARE_UNIQUE:
1343                 break;
1344 
1345         default:
1346                 return -EINVAL;
1347         }
1348 
1349         switch (p->action) {
1350         case XFRM_POLICY_ALLOW:
1351         case XFRM_POLICY_BLOCK:
1352                 break;
1353 
1354         default:
1355                 return -EINVAL;
1356         }
1357 
1358         switch (p->sel.family) {
1359         case AF_INET:
1360                 break;
1361 
1362         case AF_INET6:
1363 #if IS_ENABLED(CONFIG_IPV6)
1364                 break;
1365 #else
1366                 return  -EAFNOSUPPORT;
1367 #endif
1368 
1369         default:
1370                 return -EINVAL;
1371         }
1372 
1373         ret = verify_policy_dir(p->dir);
1374         if (ret)
1375                 return ret;
1376         if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1377                 return -EINVAL;
1378 
1379         return 0;
1380 }
1381 
1382 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1383 {
1384         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1385         struct xfrm_user_sec_ctx *uctx;
1386 
1387         if (!rt)
1388                 return 0;
1389 
1390         uctx = nla_data(rt);
1391         return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1392 }
1393 
1394 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1395                            int nr)
1396 {
1397         int i;
1398 
1399         xp->xfrm_nr = nr;
1400         for (i = 0; i < nr; i++, ut++) {
1401                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1402 
1403                 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1404                 memcpy(&t->saddr, &ut->saddr,
1405                        sizeof(xfrm_address_t));
1406                 t->reqid = ut->reqid;
1407                 t->mode = ut->mode;
1408                 t->share = ut->share;
1409                 t->optional = ut->optional;
1410                 t->aalgos = ut->aalgos;
1411                 t->ealgos = ut->ealgos;
1412                 t->calgos = ut->calgos;
1413                 /* If all masks are ~0, then we allow all algorithms. */
1414                 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1415                 t->encap_family = ut->family;
1416         }
1417 }
1418 
1419 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1420 {
1421         u16 prev_family;
1422         int i;
1423 
1424         if (nr > XFRM_MAX_DEPTH)
1425                 return -EINVAL;
1426 
1427         prev_family = family;
1428 
1429         for (i = 0; i < nr; i++) {
1430                 /* We never validated the ut->family value, so many
1431                  * applications simply leave it at zero.  The check was
1432                  * never made and ut->family was ignored because all
1433                  * templates could be assumed to have the same family as
1434                  * the policy itself.  Now that we will have ipv4-in-ipv6
1435                  * and ipv6-in-ipv4 tunnels, this is no longer true.
1436                  */
1437                 if (!ut[i].family)
1438                         ut[i].family = family;
1439 
1440                 if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
1441                     (ut[i].family != prev_family))
1442                         return -EINVAL;
1443 
1444                 prev_family = ut[i].family;
1445 
1446                 switch (ut[i].family) {
1447                 case AF_INET:
1448                         break;
1449 #if IS_ENABLED(CONFIG_IPV6)
1450                 case AF_INET6:
1451                         break;
1452 #endif
1453                 default:
1454                         return -EINVAL;
1455                 }
1456 
1457                 switch (ut[i].id.proto) {
1458                 case IPPROTO_AH:
1459                 case IPPROTO_ESP:
1460                 case IPPROTO_COMP:
1461 #if IS_ENABLED(CONFIG_IPV6)
1462                 case IPPROTO_ROUTING:
1463                 case IPPROTO_DSTOPTS:
1464 #endif
1465                 case IPSEC_PROTO_ANY:
1466                         break;
1467                 default:
1468                         return -EINVAL;
1469                 }
1470 
1471         }
1472 
1473         return 0;
1474 }
1475 
1476 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1477 {
1478         struct nlattr *rt = attrs[XFRMA_TMPL];
1479 
1480         if (!rt) {
1481                 pol->xfrm_nr = 0;
1482         } else {
1483                 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1484                 int nr = nla_len(rt) / sizeof(*utmpl);
1485                 int err;
1486 
1487                 err = validate_tmpl(nr, utmpl, pol->family);
1488                 if (err)
1489                         return err;
1490 
1491                 copy_templates(pol, utmpl, nr);
1492         }
1493         return 0;
1494 }
1495 
1496 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1497 {
1498         struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1499         struct xfrm_userpolicy_type *upt;
1500         u8 type = XFRM_POLICY_TYPE_MAIN;
1501         int err;
1502 
1503         if (rt) {
1504                 upt = nla_data(rt);
1505                 type = upt->type;
1506         }
1507 
1508         err = verify_policy_type(type);
1509         if (err)
1510                 return err;
1511 
1512         *tp = type;
1513         return 0;
1514 }
1515 
1516 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1517 {
1518         xp->priority = p->priority;
1519         xp->index = p->index;
1520         memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1521         memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1522         xp->action = p->action;
1523         xp->flags = p->flags;
1524         xp->family = p->sel.family;
1525         /* XXX xp->share = p->share; */
1526 }
1527 
1528 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1529 {
1530         memset(p, 0, sizeof(*p));
1531         memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1532         memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1533         memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1534         p->priority = xp->priority;
1535         p->index = xp->index;
1536         p->sel.family = xp->family;
1537         p->dir = dir;
1538         p->action = xp->action;
1539         p->flags = xp->flags;
1540         p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1541 }
1542 
1543 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1544 {
1545         struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1546         int err;
1547 
1548         if (!xp) {
1549                 *errp = -ENOMEM;
1550                 return NULL;
1551         }
1552 
1553         copy_from_user_policy(xp, p);
1554 
1555         err = copy_from_user_policy_type(&xp->type, attrs);
1556         if (err)
1557                 goto error;
1558 
1559         if (!(err = copy_from_user_tmpl(xp, attrs)))
1560                 err = copy_from_user_sec_ctx(xp, attrs);
1561         if (err)
1562                 goto error;
1563 
1564         xfrm_mark_get(attrs, &xp->mark);
1565 
1566         return xp;
1567  error:
1568         *errp = err;
1569         xp->walk.dead = 1;
1570         xfrm_policy_destroy(xp);
1571         return NULL;
1572 }
1573 
1574 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1575                 struct nlattr **attrs)
1576 {
1577         struct net *net = sock_net(skb->sk);
1578         struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1579         struct xfrm_policy *xp;
1580         struct km_event c;
1581         int err;
1582         int excl;
1583 
1584         err = verify_newpolicy_info(p);
1585         if (err)
1586                 return err;
1587         err = verify_sec_ctx_len(attrs);
1588         if (err)
1589                 return err;
1590 
1591         xp = xfrm_policy_construct(net, p, attrs, &err);
1592         if (!xp)
1593                 return err;
1594 
1595         /* shouldn't excl be based on nlh flags??
1596          * Aha! this is anti-netlink really i.e  more pfkey derived
1597          * in netlink excl is a flag and you wouldnt need
1598          * a type XFRM_MSG_UPDPOLICY - JHS */
1599         excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1600         err = xfrm_policy_insert(p->dir, xp, excl);
1601         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1602 
1603         if (err) {
1604                 security_xfrm_policy_free(xp->security);
1605                 kfree(xp);
1606                 return err;
1607         }
1608 
1609         c.event = nlh->nlmsg_type;
1610         c.seq = nlh->nlmsg_seq;
1611         c.portid = nlh->nlmsg_pid;
1612         km_policy_notify(xp, p->dir, &c);
1613 
1614         xfrm_pol_put(xp);
1615 
1616         return 0;
1617 }
1618 
1619 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1620 {
1621         struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1622         int i;
1623 
1624         if (xp->xfrm_nr == 0)
1625                 return 0;
1626 
1627         for (i = 0; i < xp->xfrm_nr; i++) {
1628                 struct xfrm_user_tmpl *up = &vec[i];
1629                 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1630 
1631                 memset(up, 0, sizeof(*up));
1632                 memcpy(&up->id, &kp->id, sizeof(up->id));
1633                 up->family = kp->encap_family;
1634                 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1635                 up->reqid = kp->reqid;
1636                 up->mode = kp->mode;
1637                 up->share = kp->share;
1638                 up->optional = kp->optional;
1639                 up->aalgos = kp->aalgos;
1640                 up->ealgos = kp->ealgos;
1641                 up->calgos = kp->calgos;
1642         }
1643 
1644         return nla_put(skb, XFRMA_TMPL,
1645                        sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1646 }
1647 
1648 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1649 {
1650         if (x->security) {
1651                 return copy_sec_ctx(x->security, skb);
1652         }
1653         return 0;
1654 }
1655 
1656 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1657 {
1658         if (xp->security)
1659                 return copy_sec_ctx(xp->security, skb);
1660         return 0;
1661 }
1662 static inline unsigned int userpolicy_type_attrsize(void)
1663 {
1664 #ifdef CONFIG_XFRM_SUB_POLICY
1665         return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1666 #else
1667         return 0;
1668 #endif
1669 }
1670 
1671 #ifdef CONFIG_XFRM_SUB_POLICY
1672 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1673 {
1674         struct xfrm_userpolicy_type upt = {
1675                 .type = type,
1676         };
1677 
1678         return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1679 }
1680 
1681 #else
1682 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1683 {
1684         return 0;
1685 }
1686 #endif
1687 
1688 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1689 {
1690         struct xfrm_dump_info *sp = ptr;
1691         struct xfrm_userpolicy_info *p;
1692         struct sk_buff *in_skb = sp->in_skb;
1693         struct sk_buff *skb = sp->out_skb;
1694         struct nlmsghdr *nlh;
1695         int err;
1696 
1697         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1698                         XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1699         if (nlh == NULL)
1700                 return -EMSGSIZE;
1701 
1702         p = nlmsg_data(nlh);
1703         copy_to_user_policy(xp, p, dir);
1704         err = copy_to_user_tmpl(xp, skb);
1705         if (!err)
1706                 err = copy_to_user_sec_ctx(xp, skb);
1707         if (!err)
1708                 err = copy_to_user_policy_type(xp->type, skb);
1709         if (!err)
1710                 err = xfrm_mark_put(skb, &xp->mark);
1711         if (err) {
1712                 nlmsg_cancel(skb, nlh);
1713                 return err;
1714         }
1715         nlmsg_end(skb, nlh);
1716         return 0;
1717 }
1718 
1719 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1720 {
1721         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1722         struct net *net = sock_net(cb->skb->sk);
1723 
1724         xfrm_policy_walk_done(walk, net);
1725         return 0;
1726 }
1727 
1728 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1729 {
1730         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1731 
1732         BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1733 
1734         xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1735         return 0;
1736 }
1737 
1738 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1739 {
1740         struct net *net = sock_net(skb->sk);
1741         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1742         struct xfrm_dump_info info;
1743 
1744         info.in_skb = cb->skb;
1745         info.out_skb = skb;
1746         info.nlmsg_seq = cb->nlh->nlmsg_seq;
1747         info.nlmsg_flags = NLM_F_MULTI;
1748 
1749         (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1750 
1751         return skb->len;
1752 }
1753 
1754 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1755                                           struct xfrm_policy *xp,
1756                                           int dir, u32 seq)
1757 {
1758         struct xfrm_dump_info info;
1759         struct sk_buff *skb;
1760         int err;
1761 
1762         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1763         if (!skb)
1764                 return ERR_PTR(-ENOMEM);
1765 
1766         info.in_skb = in_skb;
1767         info.out_skb = skb;
1768         info.nlmsg_seq = seq;
1769         info.nlmsg_flags = 0;
1770 
1771         err = dump_one_policy(xp, dir, 0, &info);
1772         if (err) {
1773                 kfree_skb(skb);
1774                 return ERR_PTR(err);
1775         }
1776 
1777         return skb;
1778 }
1779 
1780 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1781                 struct nlattr **attrs)
1782 {
1783         struct net *net = sock_net(skb->sk);
1784         struct xfrm_policy *xp;
1785         struct xfrm_userpolicy_id *p;
1786         u8 type = XFRM_POLICY_TYPE_MAIN;
1787         int err;
1788         struct km_event c;
1789         int delete;
1790         struct xfrm_mark m;
1791         u32 mark = xfrm_mark_get(attrs, &m);
1792 
1793         p = nlmsg_data(nlh);
1794         delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1795 
1796         err = copy_from_user_policy_type(&type, attrs);
1797         if (err)
1798                 return err;
1799 
1800         err = verify_policy_dir(p->dir);
1801         if (err)
1802                 return err;
1803 
1804         if (p->index)
1805                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1806         else {
1807                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1808                 struct xfrm_sec_ctx *ctx;
1809 
1810                 err = verify_sec_ctx_len(attrs);
1811                 if (err)
1812                         return err;
1813 
1814                 ctx = NULL;
1815                 if (rt) {
1816                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1817 
1818                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1819                         if (err)
1820                                 return err;
1821                 }
1822                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1823                                            ctx, delete, &err);
1824                 security_xfrm_policy_free(ctx);
1825         }
1826         if (xp == NULL)
1827                 return -ENOENT;
1828 
1829         if (!delete) {
1830                 struct sk_buff *resp_skb;
1831 
1832                 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1833                 if (IS_ERR(resp_skb)) {
1834                         err = PTR_ERR(resp_skb);
1835                 } else {
1836                         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1837                                             NETLINK_CB(skb).portid);
1838                 }
1839         } else {
1840                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1841 
1842                 if (err != 0)
1843                         goto out;
1844 
1845                 c.data.byid = p->index;
1846                 c.event = nlh->nlmsg_type;
1847                 c.seq = nlh->nlmsg_seq;
1848                 c.portid = nlh->nlmsg_pid;
1849                 km_policy_notify(xp, p->dir, &c);
1850         }
1851 
1852 out:
1853         xfrm_pol_put(xp);
1854         return err;
1855 }
1856 
1857 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1858                 struct nlattr **attrs)
1859 {
1860         struct net *net = sock_net(skb->sk);
1861         struct km_event c;
1862         struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1863         int err;
1864 
1865         err = xfrm_state_flush(net, p->proto, true);
1866         if (err) {
1867                 if (err == -ESRCH) /* empty table */
1868                         return 0;
1869                 return err;
1870         }
1871         c.data.proto = p->proto;
1872         c.event = nlh->nlmsg_type;
1873         c.seq = nlh->nlmsg_seq;
1874         c.portid = nlh->nlmsg_pid;
1875         c.net = net;
1876         km_state_notify(NULL, &c);
1877 
1878         return 0;
1879 }
1880 
1881 static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x)
1882 {
1883         unsigned int replay_size = x->replay_esn ?
1884                               xfrm_replay_state_esn_len(x->replay_esn) :
1885                               sizeof(struct xfrm_replay_state);
1886 
1887         return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1888                + nla_total_size(replay_size)
1889                + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur))
1890                + nla_total_size(sizeof(struct xfrm_mark))
1891                + nla_total_size(4) /* XFRM_AE_RTHR */
1892                + nla_total_size(4); /* XFRM_AE_ETHR */
1893 }
1894 
1895 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1896 {
1897         struct xfrm_aevent_id *id;
1898         struct nlmsghdr *nlh;
1899         int err;
1900 
1901         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1902         if (nlh == NULL)
1903                 return -EMSGSIZE;
1904 
1905         id = nlmsg_data(nlh);
1906         memset(&id->sa_id, 0, sizeof(id->sa_id));
1907         memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1908         id->sa_id.spi = x->id.spi;
1909         id->sa_id.family = x->props.family;
1910         id->sa_id.proto = x->id.proto;
1911         memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1912         id->reqid = x->props.reqid;
1913         id->flags = c->data.aevent;
1914 
1915         if (x->replay_esn) {
1916                 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1917                               xfrm_replay_state_esn_len(x->replay_esn),
1918                               x->replay_esn);
1919         } else {
1920                 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1921                               &x->replay);
1922         }
1923         if (err)
1924                 goto out_cancel;
1925         err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft,
1926                             XFRMA_PAD);
1927         if (err)
1928                 goto out_cancel;
1929 
1930         if (id->flags & XFRM_AE_RTHR) {
1931                 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1932                 if (err)
1933                         goto out_cancel;
1934         }
1935         if (id->flags & XFRM_AE_ETHR) {
1936                 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1937                                   x->replay_maxage * 10 / HZ);
1938                 if (err)
1939                         goto out_cancel;
1940         }
1941         err = xfrm_mark_put(skb, &x->mark);
1942         if (err)
1943                 goto out_cancel;
1944 
1945         nlmsg_end(skb, nlh);
1946         return 0;
1947 
1948 out_cancel:
1949         nlmsg_cancel(skb, nlh);
1950         return err;
1951 }
1952 
1953 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1954                 struct nlattr **attrs)
1955 {
1956         struct net *net = sock_net(skb->sk);
1957         struct xfrm_state *x;
1958         struct sk_buff *r_skb;
1959         int err;
1960         struct km_event c;
1961         u32 mark;
1962         struct xfrm_mark m;
1963         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1964         struct xfrm_usersa_id *id = &p->sa_id;
1965 
1966         mark = xfrm_mark_get(attrs, &m);
1967 
1968         x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1969         if (x == NULL)
1970                 return -ESRCH;
1971 
1972         r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1973         if (r_skb == NULL) {
1974                 xfrm_state_put(x);
1975                 return -ENOMEM;
1976         }
1977 
1978         /*
1979          * XXX: is this lock really needed - none of the other
1980          * gets lock (the concern is things getting updated
1981          * while we are still reading) - jhs
1982         */
1983         spin_lock_bh(&x->lock);
1984         c.data.aevent = p->flags;
1985         c.seq = nlh->nlmsg_seq;
1986         c.portid = nlh->nlmsg_pid;
1987 
1988         err = build_aevent(r_skb, x, &c);
1989         BUG_ON(err < 0);
1990 
1991         err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1992         spin_unlock_bh(&x->lock);
1993         xfrm_state_put(x);
1994         return err;
1995 }
1996 
1997 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1998                 struct nlattr **attrs)
1999 {
2000         struct net *net = sock_net(skb->sk);
2001         struct xfrm_state *x;
2002         struct km_event c;
2003         int err = -EINVAL;
2004         u32 mark = 0;
2005         struct xfrm_mark m;
2006         struct xfrm_aevent_id *p = nlmsg_data(nlh);
2007         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
2008         struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
2009         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
2010         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
2011         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
2012 
2013         if (!lt && !rp && !re && !et && !rt)
2014                 return err;
2015 
2016         /* pedantic mode - thou shalt sayeth replaceth */
2017         if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
2018                 return err;
2019 
2020         mark = xfrm_mark_get(attrs, &m);
2021 
2022         x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
2023         if (x == NULL)
2024                 return -ESRCH;
2025 
2026         if (x->km.state != XFRM_STATE_VALID)
2027                 goto out;
2028 
2029         err = xfrm_replay_verify_len(x->replay_esn, re);
2030         if (err)
2031                 goto out;
2032 
2033         spin_lock_bh(&x->lock);
2034         xfrm_update_ae_params(x, attrs, 1);
2035         spin_unlock_bh(&x->lock);
2036 
2037         c.event = nlh->nlmsg_type;
2038         c.seq = nlh->nlmsg_seq;
2039         c.portid = nlh->nlmsg_pid;
2040         c.data.aevent = XFRM_AE_CU;
2041         km_state_notify(x, &c);
2042         err = 0;
2043 out:
2044         xfrm_state_put(x);
2045         return err;
2046 }
2047 
2048 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2049                 struct nlattr **attrs)
2050 {
2051         struct net *net = sock_net(skb->sk);
2052         struct km_event c;
2053         u8 type = XFRM_POLICY_TYPE_MAIN;
2054         int err;
2055 
2056         err = copy_from_user_policy_type(&type, attrs);
2057         if (err)
2058                 return err;
2059 
2060         err = xfrm_policy_flush(net, type, true);
2061         if (err) {
2062                 if (err == -ESRCH) /* empty table */
2063                         return 0;
2064                 return err;
2065         }
2066 
2067         c.data.type = type;
2068         c.event = nlh->nlmsg_type;
2069         c.seq = nlh->nlmsg_seq;
2070         c.portid = nlh->nlmsg_pid;
2071         c.net = net;
2072         km_policy_notify(NULL, 0, &c);
2073         return 0;
2074 }
2075 
2076 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2077                 struct nlattr **attrs)
2078 {
2079         struct net *net = sock_net(skb->sk);
2080         struct xfrm_policy *xp;
2081         struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2082         struct xfrm_userpolicy_info *p = &up->pol;
2083         u8 type = XFRM_POLICY_TYPE_MAIN;
2084         int err = -ENOENT;
2085         struct xfrm_mark m;
2086         u32 mark = xfrm_mark_get(attrs, &m);
2087 
2088         err = copy_from_user_policy_type(&type, attrs);
2089         if (err)
2090                 return err;
2091 
2092         err = verify_policy_dir(p->dir);
2093         if (err)
2094                 return err;
2095 
2096         if (p->index)
2097                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2098         else {
2099                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2100                 struct xfrm_sec_ctx *ctx;
2101 
2102                 err = verify_sec_ctx_len(attrs);
2103                 if (err)
2104                         return err;
2105 
2106                 ctx = NULL;
2107                 if (rt) {
2108                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2109 
2110                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2111                         if (err)
2112                                 return err;
2113                 }
2114                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2115                                            &p->sel, ctx, 0, &err);
2116                 security_xfrm_policy_free(ctx);
2117         }
2118         if (xp == NULL)
2119                 return -ENOENT;
2120 
2121         if (unlikely(xp->walk.dead))
2122                 goto out;
2123 
2124         err = 0;
2125         if (up->hard) {
2126                 xfrm_policy_delete(xp, p->dir);
2127                 xfrm_audit_policy_delete(xp, 1, true);
2128         }
2129         km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2130 
2131 out:
2132         xfrm_pol_put(xp);
2133         return err;
2134 }
2135 
2136 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2137                 struct nlattr **attrs)
2138 {
2139         struct net *net = sock_net(skb->sk);
2140         struct xfrm_state *x;
2141         int err;
2142         struct xfrm_user_expire *ue = nlmsg_data(nlh);
2143         struct xfrm_usersa_info *p = &ue->state;
2144         struct xfrm_mark m;
2145         u32 mark = xfrm_mark_get(attrs, &m);
2146 
2147         x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2148 
2149         err = -ENOENT;
2150         if (x == NULL)
2151                 return err;
2152 
2153         spin_lock_bh(&x->lock);
2154         err = -EINVAL;
2155         if (x->km.state != XFRM_STATE_VALID)
2156                 goto out;
2157         km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2158 
2159         if (ue->hard) {
2160                 __xfrm_state_delete(x);
2161                 xfrm_audit_state_delete(x, 1, true);
2162         }
2163         err = 0;
2164 out:
2165         spin_unlock_bh(&x->lock);
2166         xfrm_state_put(x);
2167         return err;
2168 }
2169 
2170 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2171                 struct nlattr **attrs)
2172 {
2173         struct net *net = sock_net(skb->sk);
2174         struct xfrm_policy *xp;
2175         struct xfrm_user_tmpl *ut;
2176         int i;
2177         struct nlattr *rt = attrs[XFRMA_TMPL];
2178         struct xfrm_mark mark;
2179 
2180         struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2181         struct xfrm_state *x = xfrm_state_alloc(net);
2182         int err = -ENOMEM;
2183 
2184         if (!x)
2185                 goto nomem;
2186 
2187         xfrm_mark_get(attrs, &mark);
2188 
2189         err = verify_newpolicy_info(&ua->policy);
2190         if (err)
2191                 goto free_state;
2192 
2193         /*   build an XP */
2194         xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2195         if (!xp)
2196                 goto free_state;
2197 
2198         memcpy(&x->id, &ua->id, sizeof(ua->id));
2199         memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2200         memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2201         xp->mark.m = x->mark.m = mark.m;
2202         xp->mark.v = x->mark.v = mark.v;
2203         ut = nla_data(rt);
2204         /* extract the templates and for each call km_key */
2205         for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2206                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2207                 memcpy(&x->id, &t->id, sizeof(x->id));
2208                 x->props.mode = t->mode;
2209                 x->props.reqid = t->reqid;
2210                 x->props.family = ut->family;
2211                 t->aalgos = ua->aalgos;
2212                 t->ealgos = ua->ealgos;
2213                 t->calgos = ua->calgos;
2214                 err = km_query(x, t, xp);
2215 
2216         }
2217 
2218         kfree(x);
2219         kfree(xp);
2220 
2221         return 0;
2222 
2223 free_state:
2224         kfree(x);
2225 nomem:
2226         return err;
2227 }
2228 
2229 #ifdef CONFIG_XFRM_MIGRATE
2230 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2231                                   struct xfrm_kmaddress *k,
2232                                   struct nlattr **attrs, int *num)
2233 {
2234         struct nlattr *rt = attrs[XFRMA_MIGRATE];
2235         struct xfrm_user_migrate *um;
2236         int i, num_migrate;
2237 
2238         if (k != NULL) {
2239                 struct xfrm_user_kmaddress *uk;
2240 
2241                 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2242                 memcpy(&k->local, &uk->local, sizeof(k->local));
2243                 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2244                 k->family = uk->family;
2245                 k->reserved = uk->reserved;
2246         }
2247 
2248         um = nla_data(rt);
2249         num_migrate = nla_len(rt) / sizeof(*um);
2250 
2251         if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2252                 return -EINVAL;
2253 
2254         for (i = 0; i < num_migrate; i++, um++, ma++) {
2255                 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2256                 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2257                 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2258                 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2259 
2260                 ma->proto = um->proto;
2261                 ma->mode = um->mode;
2262                 ma->reqid = um->reqid;
2263 
2264                 ma->old_family = um->old_family;
2265                 ma->new_family = um->new_family;
2266         }
2267 
2268         *num = i;
2269         return 0;
2270 }
2271 
2272 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2273                            struct nlattr **attrs)
2274 {
2275         struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2276         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2277         struct xfrm_kmaddress km, *kmp;
2278         u8 type;
2279         int err;
2280         int n = 0;
2281         struct net *net = sock_net(skb->sk);
2282         struct xfrm_encap_tmpl  *encap = NULL;
2283 
2284         if (attrs[XFRMA_MIGRATE] == NULL)
2285                 return -EINVAL;
2286 
2287         kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2288 
2289         err = copy_from_user_policy_type(&type, attrs);
2290         if (err)
2291                 return err;
2292 
2293         err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2294         if (err)
2295                 return err;
2296 
2297         if (!n)
2298                 return 0;
2299 
2300         if (attrs[XFRMA_ENCAP]) {
2301                 encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
2302                                 sizeof(*encap), GFP_KERNEL);
2303                 if (!encap)
2304                         return 0;
2305         }
2306 
2307         err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap);
2308 
2309         kfree(encap);
2310 
2311         return err;
2312 }
2313 #else
2314 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2315                            struct nlattr **attrs)
2316 {
2317         return -ENOPROTOOPT;
2318 }
2319 #endif
2320 
2321 #ifdef CONFIG_XFRM_MIGRATE
2322 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2323 {
2324         struct xfrm_user_migrate um;
2325 
2326         memset(&um, 0, sizeof(um));
2327         um.proto = m->proto;
2328         um.mode = m->mode;
2329         um.reqid = m->reqid;
2330         um.old_family = m->old_family;
2331         memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2332         memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2333         um.new_family = m->new_family;
2334         memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2335         memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2336 
2337         return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2338 }
2339 
2340 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2341 {
2342         struct xfrm_user_kmaddress uk;
2343 
2344         memset(&uk, 0, sizeof(uk));
2345         uk.family = k->family;
2346         uk.reserved = k->reserved;
2347         memcpy(&uk.local, &k->local, sizeof(uk.local));
2348         memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2349 
2350         return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2351 }
2352 
2353 static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma,
2354                                                 int with_encp)
2355 {
2356         return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2357               + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2358               + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0)
2359               + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2360               + userpolicy_type_attrsize();
2361 }
2362 
2363 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2364                          int num_migrate, const struct xfrm_kmaddress *k,
2365                          const struct xfrm_selector *sel,
2366                          const struct xfrm_encap_tmpl *encap, u8 dir, u8 type)
2367 {
2368         const struct xfrm_migrate *mp;
2369         struct xfrm_userpolicy_id *pol_id;
2370         struct nlmsghdr *nlh;
2371         int i, err;
2372 
2373         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2374         if (nlh == NULL)
2375                 return -EMSGSIZE;
2376 
2377         pol_id = nlmsg_data(nlh);
2378         /* copy data from selector, dir, and type to the pol_id */
2379         memset(pol_id, 0, sizeof(*pol_id));
2380         memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2381         pol_id->dir = dir;
2382 
2383         if (k != NULL) {
2384                 err = copy_to_user_kmaddress(k, skb);
2385                 if (err)
2386                         goto out_cancel;
2387         }
2388         if (encap) {
2389                 err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap);
2390                 if (err)
2391                         goto out_cancel;
2392         }
2393         err = copy_to_user_policy_type(type, skb);
2394         if (err)
2395                 goto out_cancel;
2396         for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2397                 err = copy_to_user_migrate(mp, skb);
2398                 if (err)
2399                         goto out_cancel;
2400         }
2401 
2402         nlmsg_end(skb, nlh);
2403         return 0;
2404 
2405 out_cancel:
2406         nlmsg_cancel(skb, nlh);
2407         return err;
2408 }
2409 
2410 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2411                              const struct xfrm_migrate *m, int num_migrate,
2412                              const struct xfrm_kmaddress *k,
2413                              const struct xfrm_encap_tmpl *encap)
2414 {
2415         struct net *net = &init_net;
2416         struct sk_buff *skb;
2417         int err;
2418 
2419         skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap),
2420                         GFP_ATOMIC);
2421         if (skb == NULL)
2422                 return -ENOMEM;
2423 
2424         /* build migrate */
2425         err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type);
2426         BUG_ON(err < 0);
2427 
2428         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2429 }
2430 #else
2431 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2432                              const struct xfrm_migrate *m, int num_migrate,
2433                              const struct xfrm_kmaddress *k,
2434                              const struct xfrm_encap_tmpl *encap)
2435 {
2436         return -ENOPROTOOPT;
2437 }
2438 #endif
2439 
2440 #define XMSGSIZE(type) sizeof(struct type)
2441 
2442 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2443         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2444         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2445         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2446         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2447         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2448         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2449         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2450         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2451         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2452         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2453         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2454         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2455         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2456         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2457         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2458         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2459         [XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2460         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2461         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2462         [XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2463         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2464 };
2465 
2466 #undef XMSGSIZE
2467 
2468 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2469         [XFRMA_SA]              = { .len = sizeof(struct xfrm_usersa_info)},
2470         [XFRMA_POLICY]          = { .len = sizeof(struct xfrm_userpolicy_info)},
2471         [XFRMA_LASTUSED]        = { .type = NLA_U64},
2472         [XFRMA_ALG_AUTH_TRUNC]  = { .len = sizeof(struct xfrm_algo_auth)},
2473         [XFRMA_ALG_AEAD]        = { .len = sizeof(struct xfrm_algo_aead) },
2474         [XFRMA_ALG_AUTH]        = { .len = sizeof(struct xfrm_algo) },
2475         [XFRMA_ALG_CRYPT]       = { .len = sizeof(struct xfrm_algo) },
2476         [XFRMA_ALG_COMP]        = { .len = sizeof(struct xfrm_algo) },
2477         [XFRMA_ENCAP]           = { .len = sizeof(struct xfrm_encap_tmpl) },
2478         [XFRMA_TMPL]            = { .len = sizeof(struct xfrm_user_tmpl) },
2479         [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_sec_ctx) },
2480         [XFRMA_LTIME_VAL]       = { .len = sizeof(struct xfrm_lifetime_cur) },
2481         [XFRMA_REPLAY_VAL]      = { .len = sizeof(struct xfrm_replay_state) },
2482         [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },
2483         [XFRMA_ETIMER_THRESH]   = { .type = NLA_U32 },
2484         [XFRMA_SRCADDR]         = { .len = sizeof(xfrm_address_t) },
2485         [XFRMA_COADDR]          = { .len = sizeof(xfrm_address_t) },
2486         [XFRMA_POLICY_TYPE]     = { .len = sizeof(struct xfrm_userpolicy_type)},
2487         [XFRMA_MIGRATE]         = { .len = sizeof(struct xfrm_user_migrate) },
2488         [XFRMA_KMADDRESS]       = { .len = sizeof(struct xfrm_user_kmaddress) },
2489         [XFRMA_MARK]            = { .len = sizeof(struct xfrm_mark) },
2490         [XFRMA_TFCPAD]          = { .type = NLA_U32 },
2491         [XFRMA_REPLAY_ESN_VAL]  = { .len = sizeof(struct xfrm_replay_state_esn) },
2492         [XFRMA_SA_EXTRA_FLAGS]  = { .type = NLA_U32 },
2493         [XFRMA_PROTO]           = { .type = NLA_U8 },
2494         [XFRMA_ADDRESS_FILTER]  = { .len = sizeof(struct xfrm_address_filter) },
2495         [XFRMA_OFFLOAD_DEV]     = { .len = sizeof(struct xfrm_user_offload) },
2496         [XFRMA_OUTPUT_MARK]     = { .type = NLA_U32 },
2497 };
2498 
2499 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2500         [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2501         [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2502 };
2503 
2504 static const struct xfrm_link {
2505         int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2506         int (*start)(struct netlink_callback *);
2507         int (*dump)(struct sk_buff *, struct netlink_callback *);
2508         int (*done)(struct netlink_callback *);
2509         const struct nla_policy *nla_pol;
2510         int nla_max;
2511 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2512         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2513         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2514         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2515                                                    .dump = xfrm_dump_sa,
2516                                                    .done = xfrm_dump_sa_done  },
2517         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2518         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2519         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2520                                                    .start = xfrm_dump_policy_start,
2521                                                    .dump = xfrm_dump_policy,
2522                                                    .done = xfrm_dump_policy_done },
2523         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2524         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2525         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2526         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2527         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2528         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2529         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2530         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2531         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2532         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2533         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2534         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2535         [XFRM_MSG_NEWSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2536                                                    .nla_pol = xfrma_spd_policy,
2537                                                    .nla_max = XFRMA_SPD_MAX },
2538         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2539 };
2540 
2541 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
2542                              struct netlink_ext_ack *extack)
2543 {
2544         struct net *net = sock_net(skb->sk);
2545         struct nlattr *attrs[XFRMA_MAX+1];
2546         const struct xfrm_link *link;
2547         int type, err;
2548 
2549 #ifdef CONFIG_COMPAT
2550         if (in_compat_syscall())
2551                 return -EOPNOTSUPP;
2552 #endif
2553 
2554         type = nlh->nlmsg_type;
2555         if (type > XFRM_MSG_MAX)
2556                 return -EINVAL;
2557 
2558         type -= XFRM_MSG_BASE;
2559         link = &xfrm_dispatch[type];
2560 
2561         /* All operations require privileges, even GET */
2562         if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2563                 return -EPERM;
2564 
2565         if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2566              type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2567             (nlh->nlmsg_flags & NLM_F_DUMP)) {
2568                 if (link->dump == NULL)
2569                         return -EINVAL;
2570 
2571                 {
2572                         struct netlink_dump_control c = {
2573                                 .start = link->start,
2574                                 .dump = link->dump,
2575                                 .done = link->done,
2576                         };
2577                         return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2578                 }
2579         }
2580 
2581         err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2582                           link->nla_max ? : XFRMA_MAX,
2583                           link->nla_pol ? : xfrma_policy, extack);
2584         if (err < 0)
2585                 return err;
2586 
2587         if (link->doit == NULL)
2588                 return -EINVAL;
2589 
2590         return link->doit(skb, nlh, attrs);
2591 }
2592 
2593 static void xfrm_netlink_rcv(struct sk_buff *skb)
2594 {
2595         struct net *net = sock_net(skb->sk);
2596 
2597         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2598         netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2599         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2600 }
2601 
2602 static inline unsigned int xfrm_expire_msgsize(void)
2603 {
2604         return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2605                + nla_total_size(sizeof(struct xfrm_mark));
2606 }
2607 
2608 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2609 {
2610         struct xfrm_user_expire *ue;
2611         struct nlmsghdr *nlh;
2612         int err;
2613 
2614         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2615         if (nlh == NULL)
2616                 return -EMSGSIZE;
2617 
2618         ue = nlmsg_data(nlh);
2619         copy_to_user_state(x, &ue->state);
2620         ue->hard = (c->data.hard != 0) ? 1 : 0;
2621         /* clear the padding bytes */
2622         memset(&ue->hard + 1, 0, sizeof(*ue) - offsetofend(typeof(*ue), hard));
2623 
2624         err = xfrm_mark_put(skb, &x->mark);
2625         if (err)
2626                 return err;
2627 
2628         nlmsg_end(skb, nlh);
2629         return 0;
2630 }
2631 
2632 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2633 {
2634         struct net *net = xs_net(x);
2635         struct sk_buff *skb;
2636 
2637         skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2638         if (skb == NULL)
2639                 return -ENOMEM;
2640 
2641         if (build_expire(skb, x, c) < 0) {
2642                 kfree_skb(skb);
2643                 return -EMSGSIZE;
2644         }
2645 
2646         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2647 }
2648 
2649 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2650 {
2651         struct net *net = xs_net(x);
2652         struct sk_buff *skb;
2653         int err;
2654 
2655         skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2656         if (skb == NULL)
2657                 return -ENOMEM;
2658 
2659         err = build_aevent(skb, x, c);
2660         BUG_ON(err < 0);
2661 
2662         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2663 }
2664 
2665 static int xfrm_notify_sa_flush(const struct km_event *c)
2666 {
2667         struct net *net = c->net;
2668         struct xfrm_usersa_flush *p;
2669         struct nlmsghdr *nlh;
2670         struct sk_buff *skb;
2671         int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2672 
2673         skb = nlmsg_new(len, GFP_ATOMIC);
2674         if (skb == NULL)
2675                 return -ENOMEM;
2676 
2677         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2678         if (nlh == NULL) {
2679                 kfree_skb(skb);
2680                 return -EMSGSIZE;
2681         }
2682 
2683         p = nlmsg_data(nlh);
2684         p->proto = c->data.proto;
2685 
2686         nlmsg_end(skb, nlh);
2687 
2688         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2689 }
2690 
2691 static inline unsigned int xfrm_sa_len(struct xfrm_state *x)
2692 {
2693         unsigned int l = 0;
2694         if (x->aead)
2695                 l += nla_total_size(aead_len(x->aead));
2696         if (x->aalg) {
2697                 l += nla_total_size(sizeof(struct xfrm_algo) +
2698                                     (x->aalg->alg_key_len + 7) / 8);
2699                 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2700         }
2701         if (x->ealg)
2702                 l += nla_total_size(xfrm_alg_len(x->ealg));
2703         if (x->calg)
2704                 l += nla_total_size(sizeof(*x->calg));
2705         if (x->encap)
2706                 l += nla_total_size(sizeof(*x->encap));
2707         if (x->tfcpad)
2708                 l += nla_total_size(sizeof(x->tfcpad));
2709         if (x->replay_esn)
2710                 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2711         else
2712                 l += nla_total_size(sizeof(struct xfrm_replay_state));
2713         if (x->security)
2714                 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2715                                     x->security->ctx_len);
2716         if (x->coaddr)
2717                 l += nla_total_size(sizeof(*x->coaddr));
2718         if (x->props.extra_flags)
2719                 l += nla_total_size(sizeof(x->props.extra_flags));
2720         if (x->xso.dev)
2721                  l += nla_total_size(sizeof(x->xso));
2722         if (x->props.output_mark)
2723                 l += nla_total_size(sizeof(x->props.output_mark));
2724 
2725         /* Must count x->lastused as it may become non-zero behind our back. */
2726         l += nla_total_size_64bit(sizeof(u64));
2727 
2728         return l;
2729 }
2730 
2731 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2732 {
2733         struct net *net = xs_net(x);
2734         struct xfrm_usersa_info *p;
2735         struct xfrm_usersa_id *id;
2736         struct nlmsghdr *nlh;
2737         struct sk_buff *skb;
2738         unsigned int len = xfrm_sa_len(x);
2739         unsigned int headlen;
2740         int err;
2741 
2742         headlen = sizeof(*p);
2743         if (c->event == XFRM_MSG_DELSA) {
2744                 len += nla_total_size(headlen);
2745                 headlen = sizeof(*id);
2746                 len += nla_total_size(sizeof(struct xfrm_mark));
2747         }
2748         len += NLMSG_ALIGN(headlen);
2749 
2750         skb = nlmsg_new(len, GFP_ATOMIC);
2751         if (skb == NULL)
2752                 return -ENOMEM;
2753 
2754         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2755         err = -EMSGSIZE;
2756         if (nlh == NULL)
2757                 goto out_free_skb;
2758 
2759         p = nlmsg_data(nlh);
2760         if (c->event == XFRM_MSG_DELSA) {
2761                 struct nlattr *attr;
2762 
2763                 id = nlmsg_data(nlh);
2764                 memset(id, 0, sizeof(*id));
2765                 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2766                 id->spi = x->id.spi;
2767                 id->family = x->props.family;
2768                 id->proto = x->id.proto;
2769 
2770                 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2771                 err = -EMSGSIZE;
2772                 if (attr == NULL)
2773                         goto out_free_skb;
2774 
2775                 p = nla_data(attr);
2776         }
2777         err = copy_to_user_state_extra(x, p, skb);
2778         if (err)
2779                 goto out_free_skb;
2780 
2781         nlmsg_end(skb, nlh);
2782 
2783         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2784 
2785 out_free_skb:
2786         kfree_skb(skb);
2787         return err;
2788 }
2789 
2790 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2791 {
2792 
2793         switch (c->event) {
2794         case XFRM_MSG_EXPIRE:
2795                 return xfrm_exp_state_notify(x, c);
2796         case XFRM_MSG_NEWAE:
2797                 return xfrm_aevent_state_notify(x, c);
2798         case XFRM_MSG_DELSA:
2799         case XFRM_MSG_UPDSA:
2800         case XFRM_MSG_NEWSA:
2801                 return xfrm_notify_sa(x, c);
2802         case XFRM_MSG_FLUSHSA:
2803                 return xfrm_notify_sa_flush(c);
2804         default:
2805                 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2806                        c->event);
2807                 break;
2808         }
2809 
2810         return 0;
2811 
2812 }
2813 
2814 static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
2815                                                 struct xfrm_policy *xp)
2816 {
2817         return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2818                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2819                + nla_total_size(sizeof(struct xfrm_mark))
2820                + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2821                + userpolicy_type_attrsize();
2822 }
2823 
2824 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2825                          struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2826 {
2827         __u32 seq = xfrm_get_acqseq();
2828         struct xfrm_user_acquire *ua;
2829         struct nlmsghdr *nlh;
2830         int err;
2831 
2832         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2833         if (nlh == NULL)
2834                 return -EMSGSIZE;
2835 
2836         ua = nlmsg_data(nlh);
2837         memcpy(&ua->id, &x->id, sizeof(ua->id));
2838         memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2839         memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2840         copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2841         ua->aalgos = xt->aalgos;
2842         ua->ealgos = xt->ealgos;
2843         ua->calgos = xt->calgos;
2844         ua->seq = x->km.seq = seq;
2845 
2846         err = copy_to_user_tmpl(xp, skb);
2847         if (!err)
2848                 err = copy_to_user_state_sec_ctx(x, skb);
2849         if (!err)
2850                 err = copy_to_user_policy_type(xp->type, skb);
2851         if (!err)
2852                 err = xfrm_mark_put(skb, &xp->mark);
2853         if (err) {
2854                 nlmsg_cancel(skb, nlh);
2855                 return err;
2856         }
2857 
2858         nlmsg_end(skb, nlh);
2859         return 0;
2860 }
2861 
2862 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2863                              struct xfrm_policy *xp)
2864 {
2865         struct net *net = xs_net(x);
2866         struct sk_buff *skb;
2867         int err;
2868 
2869         skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2870         if (skb == NULL)
2871                 return -ENOMEM;
2872 
2873         err = build_acquire(skb, x, xt, xp);
2874         BUG_ON(err < 0);
2875 
2876         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2877 }
2878 
2879 /* User gives us xfrm_user_policy_info followed by an array of 0
2880  * or more templates.
2881  */
2882 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2883                                                u8 *data, int len, int *dir)
2884 {
2885         struct net *net = sock_net(sk);
2886         struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2887         struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2888         struct xfrm_policy *xp;
2889         int nr;
2890 
2891         switch (sk->sk_family) {
2892         case AF_INET:
2893                 if (opt != IP_XFRM_POLICY) {
2894                         *dir = -EOPNOTSUPP;
2895                         return NULL;
2896                 }
2897                 break;
2898 #if IS_ENABLED(CONFIG_IPV6)
2899         case AF_INET6:
2900                 if (opt != IPV6_XFRM_POLICY) {
2901                         *dir = -EOPNOTSUPP;
2902                         return NULL;
2903                 }
2904                 break;
2905 #endif
2906         default:
2907                 *dir = -EINVAL;
2908                 return NULL;
2909         }
2910 
2911         *dir = -EINVAL;
2912 
2913         if (len < sizeof(*p) ||
2914             verify_newpolicy_info(p))
2915                 return NULL;
2916 
2917         nr = ((len - sizeof(*p)) / sizeof(*ut));
2918         if (validate_tmpl(nr, ut, p->sel.family))
2919                 return NULL;
2920 
2921         if (p->dir > XFRM_POLICY_OUT)
2922                 return NULL;
2923 
2924         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2925         if (xp == NULL) {
2926                 *dir = -ENOBUFS;
2927                 return NULL;
2928         }
2929 
2930         copy_from_user_policy(xp, p);
2931         xp->type = XFRM_POLICY_TYPE_MAIN;
2932         copy_templates(xp, ut, nr);
2933 
2934         *dir = p->dir;
2935 
2936         return xp;
2937 }
2938 
2939 static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2940 {
2941         return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2942                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2943                + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2944                + nla_total_size(sizeof(struct xfrm_mark))
2945                + userpolicy_type_attrsize();
2946 }
2947 
2948 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2949                            int dir, const struct km_event *c)
2950 {
2951         struct xfrm_user_polexpire *upe;
2952         int hard = c->data.hard;
2953         struct nlmsghdr *nlh;
2954         int err;
2955 
2956         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2957         if (nlh == NULL)
2958                 return -EMSGSIZE;
2959 
2960         upe = nlmsg_data(nlh);
2961         copy_to_user_policy(xp, &upe->pol, dir);
2962         err = copy_to_user_tmpl(xp, skb);
2963         if (!err)
2964                 err = copy_to_user_sec_ctx(xp, skb);
2965         if (!err)
2966                 err = copy_to_user_policy_type(xp->type, skb);
2967         if (!err)
2968                 err = xfrm_mark_put(skb, &xp->mark);
2969         if (err) {
2970                 nlmsg_cancel(skb, nlh);
2971                 return err;
2972         }
2973         upe->hard = !!hard;
2974 
2975         nlmsg_end(skb, nlh);
2976         return 0;
2977 }
2978 
2979 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2980 {
2981         struct net *net = xp_net(xp);
2982         struct sk_buff *skb;
2983         int err;
2984 
2985         skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2986         if (skb == NULL)
2987                 return -ENOMEM;
2988 
2989         err = build_polexpire(skb, xp, dir, c);
2990         BUG_ON(err < 0);
2991 
2992         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2993 }
2994 
2995 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2996 {
2997         unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2998         struct net *net = xp_net(xp);
2999         struct xfrm_userpolicy_info *p;
3000         struct xfrm_userpolicy_id *id;
3001         struct nlmsghdr *nlh;
3002         struct sk_buff *skb;
3003         unsigned int headlen;
3004         int err;
3005 
3006         headlen = sizeof(*p);
3007         if (c->event == XFRM_MSG_DELPOLICY) {
3008                 len += nla_total_size(headlen);
3009                 headlen = sizeof(*id);
3010         }
3011         len += userpolicy_type_attrsize();
3012         len += nla_total_size(sizeof(struct xfrm_mark));
3013         len += NLMSG_ALIGN(headlen);
3014 
3015         skb = nlmsg_new(len, GFP_ATOMIC);
3016         if (skb == NULL)
3017                 return -ENOMEM;
3018 
3019         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
3020         err = -EMSGSIZE;
3021         if (nlh == NULL)
3022                 goto out_free_skb;
3023 
3024         p = nlmsg_data(nlh);
3025         if (c->event == XFRM_MSG_DELPOLICY) {
3026                 struct nlattr *attr;
3027 
3028                 id = nlmsg_data(nlh);
3029                 memset(id, 0, sizeof(*id));
3030                 id->dir = dir;
3031                 if (c->data.byid)
3032                         id->index = xp->index;
3033                 else
3034                         memcpy(&id->sel, &xp->selector, sizeof(id->sel));
3035 
3036                 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
3037                 err = -EMSGSIZE;
3038                 if (attr == NULL)
3039                         goto out_free_skb;
3040 
3041                 p = nla_data(attr);
3042         }
3043 
3044         copy_to_user_policy(xp, p, dir);
3045         err = copy_to_user_tmpl(xp, skb);
3046         if (!err)
3047                 err = copy_to_user_policy_type(xp->type, skb);
3048         if (!err)
3049                 err = xfrm_mark_put(skb, &xp->mark);
3050         if (err)
3051                 goto out_free_skb;
3052 
3053         nlmsg_end(skb, nlh);
3054 
3055         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3056 
3057 out_free_skb:
3058         kfree_skb(skb);
3059         return err;
3060 }
3061 
3062 static int xfrm_notify_policy_flush(const struct km_event *c)
3063 {
3064         struct net *net = c->net;
3065         struct nlmsghdr *nlh;
3066         struct sk_buff *skb;
3067         int err;
3068 
3069         skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
3070         if (skb == NULL)
3071                 return -ENOMEM;
3072 
3073         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3074         err = -EMSGSIZE;
3075         if (nlh == NULL)
3076                 goto out_free_skb;
3077         err = copy_to_user_policy_type(c->data.type, skb);
3078         if (err)
3079                 goto out_free_skb;
3080 
3081         nlmsg_end(skb, nlh);
3082 
3083         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3084 
3085 out_free_skb:
3086         kfree_skb(skb);
3087         return err;
3088 }
3089 
3090 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3091 {
3092 
3093         switch (c->event) {
3094         case XFRM_MSG_NEWPOLICY:
3095         case XFRM_MSG_UPDPOLICY:
3096         case XFRM_MSG_DELPOLICY:
3097                 return xfrm_notify_policy(xp, dir, c);
3098         case XFRM_MSG_FLUSHPOLICY:
3099                 return xfrm_notify_policy_flush(c);
3100         case XFRM_MSG_POLEXPIRE:
3101                 return xfrm_exp_policy_notify(xp, dir, c);
3102         default:
3103                 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3104                        c->event);
3105         }
3106 
3107         return 0;
3108 
3109 }
3110 
3111 static inline unsigned int xfrm_report_msgsize(void)
3112 {
3113         return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3114 }
3115 
3116 static int build_report(struct sk_buff *skb, u8 proto,
3117                         struct xfrm_selector *sel, xfrm_address_t *addr)
3118 {
3119         struct xfrm_user_report *ur;
3120         struct nlmsghdr *nlh;
3121 
3122         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3123         if (nlh == NULL)
3124                 return -EMSGSIZE;
3125 
3126         ur = nlmsg_data(nlh);
3127         ur->proto = proto;
3128         memcpy(&ur->sel, sel, sizeof(ur->sel));
3129 
3130         if (addr) {
3131                 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3132                 if (err) {
3133                         nlmsg_cancel(skb, nlh);
3134                         return err;
3135                 }
3136         }
3137         nlmsg_end(skb, nlh);
3138         return 0;
3139 }
3140 
3141 static int xfrm_send_report(struct net *net, u8 proto,
3142                             struct xfrm_selector *sel, xfrm_address_t *addr)
3143 {
3144         struct sk_buff *skb;
3145         int err;
3146 
3147         skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3148         if (skb == NULL)
3149                 return -ENOMEM;
3150 
3151         err = build_report(skb, proto, sel, addr);
3152         BUG_ON(err < 0);
3153 
3154         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3155 }
3156 
3157 static inline unsigned int xfrm_mapping_msgsize(void)
3158 {
3159         return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3160 }
3161 
3162 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3163                          xfrm_address_t *new_saddr, __be16 new_sport)
3164 {
3165         struct xfrm_user_mapping *um;
3166         struct nlmsghdr *nlh;
3167 
3168         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3169         if (nlh == NULL)
3170                 return -EMSGSIZE;
3171 
3172         um = nlmsg_data(nlh);
3173 
3174         memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3175         um->id.spi = x->id.spi;
3176         um->id.family = x->props.family;
3177         um->id.proto = x->id.proto;
3178         memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3179         memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3180         um->new_sport = new_sport;
3181         um->old_sport = x->encap->encap_sport;
3182         um->reqid = x->props.reqid;
3183 
3184         nlmsg_end(skb, nlh);
3185         return 0;
3186 }
3187 
3188 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3189                              __be16 sport)
3190 {
3191         struct net *net = xs_net(x);
3192         struct sk_buff *skb;
3193         int err;
3194 
3195         if (x->id.proto != IPPROTO_ESP)
3196                 return -EINVAL;
3197 
3198         if (!x->encap)
3199                 return -EINVAL;
3200 
3201         skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3202         if (skb == NULL)
3203                 return -ENOMEM;
3204 
3205         err = build_mapping(skb, x, ipaddr, sport);
3206         BUG_ON(err < 0);
3207 
3208         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3209 }
3210 
3211 static bool xfrm_is_alive(const struct km_event *c)
3212 {
3213         return (bool)xfrm_acquire_is_on(c->net);
3214 }
3215 
3216 static struct xfrm_mgr netlink_mgr = {
3217         .notify         = xfrm_send_state_notify,
3218         .acquire        = xfrm_send_acquire,
3219         .compile_policy = xfrm_compile_policy,
3220         .notify_policy  = xfrm_send_policy_notify,
3221         .report         = xfrm_send_report,
3222         .migrate        = xfrm_send_migrate,
3223         .new_mapping    = xfrm_send_mapping,
3224         .is_alive       = xfrm_is_alive,
3225 };
3226 
3227 static int __net_init xfrm_user_net_init(struct net *net)
3228 {
3229         struct sock *nlsk;
3230         struct netlink_kernel_cfg cfg = {
3231                 .groups = XFRMNLGRP_MAX,
3232                 .input  = xfrm_netlink_rcv,
3233         };
3234 
3235         nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3236         if (nlsk == NULL)
3237                 return -ENOMEM;
3238         net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3239         rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3240         return 0;
3241 }
3242 
3243 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3244 {
3245         struct net *net;
3246         list_for_each_entry(net, net_exit_list, exit_list)
3247                 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3248         synchronize_net();
3249         list_for_each_entry(net, net_exit_list, exit_list)
3250                 netlink_kernel_release(net->xfrm.nlsk_stash);
3251 }
3252 
3253 static struct pernet_operations xfrm_user_net_ops = {
3254         .init       = xfrm_user_net_init,
3255         .exit_batch = xfrm_user_net_exit,
3256 };
3257 
3258 static int __init xfrm_user_init(void)
3259 {
3260         int rv;
3261 
3262         printk(KERN_INFO "Initializing XFRM netlink socket\n");
3263 
3264         rv = register_pernet_subsys(&xfrm_user_net_ops);
3265         if (rv < 0)
3266                 return rv;
3267         rv = xfrm_register_km(&netlink_mgr);
3268         if (rv < 0)
3269                 unregister_pernet_subsys(&xfrm_user_net_ops);
3270         return rv;
3271 }
3272 
3273 static void __exit xfrm_user_exit(void)
3274 {
3275         xfrm_unregister_km(&netlink_mgr);
3276         unregister_pernet_subsys(&xfrm_user_net_ops);
3277 }
3278 
3279 module_init(xfrm_user_init);
3280 module_exit(xfrm_user_exit);
3281 MODULE_LICENSE("GPL");
3282 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3283 
3284 

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