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Linux/net/xfrm/xfrm_user.c

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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 <asm/uaccess.h>
 31 #if IS_ENABLED(CONFIG_IPV6)
 32 #include <linux/in6.h>
 33 #endif
 34 
 35 static inline int aead_len(struct xfrm_algo_aead *alg)
 36 {
 37         return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
 38 }
 39 
 40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
 41 {
 42         struct nlattr *rt = attrs[type];
 43         struct xfrm_algo *algp;
 44 
 45         if (!rt)
 46                 return 0;
 47 
 48         algp = nla_data(rt);
 49         if (nla_len(rt) < xfrm_alg_len(algp))
 50                 return -EINVAL;
 51 
 52         switch (type) {
 53         case XFRMA_ALG_AUTH:
 54         case XFRMA_ALG_CRYPT:
 55         case XFRMA_ALG_COMP:
 56                 break;
 57 
 58         default:
 59                 return -EINVAL;
 60         }
 61 
 62         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 63         return 0;
 64 }
 65 
 66 static int verify_auth_trunc(struct nlattr **attrs)
 67 {
 68         struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
 69         struct xfrm_algo_auth *algp;
 70 
 71         if (!rt)
 72                 return 0;
 73 
 74         algp = nla_data(rt);
 75         if (nla_len(rt) < xfrm_alg_auth_len(algp))
 76                 return -EINVAL;
 77 
 78         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 79         return 0;
 80 }
 81 
 82 static int verify_aead(struct nlattr **attrs)
 83 {
 84         struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
 85         struct xfrm_algo_aead *algp;
 86 
 87         if (!rt)
 88                 return 0;
 89 
 90         algp = nla_data(rt);
 91         if (nla_len(rt) < aead_len(algp))
 92                 return -EINVAL;
 93 
 94         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 95         return 0;
 96 }
 97 
 98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
 99                            xfrm_address_t **addrp)
100 {
101         struct nlattr *rt = attrs[type];
102 
103         if (rt && addrp)
104                 *addrp = nla_data(rt);
105 }
106 
107 static inline int verify_sec_ctx_len(struct nlattr **attrs)
108 {
109         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
110         struct xfrm_user_sec_ctx *uctx;
111 
112         if (!rt)
113                 return 0;
114 
115         uctx = nla_data(rt);
116         if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
117                 return -EINVAL;
118 
119         return 0;
120 }
121 
122 static inline int verify_replay(struct xfrm_usersa_info *p,
123                                 struct nlattr **attrs)
124 {
125         struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126         struct xfrm_replay_state_esn *rs;
127 
128         if (p->flags & XFRM_STATE_ESN) {
129                 if (!rt)
130                         return -EINVAL;
131 
132                 rs = nla_data(rt);
133 
134                 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
135                         return -EINVAL;
136 
137                 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
138                     nla_len(rt) != sizeof(*rs))
139                         return -EINVAL;
140         }
141 
142         if (!rt)
143                 return 0;
144 
145         if (p->id.proto != IPPROTO_ESP)
146                 return -EINVAL;
147 
148         if (p->replay_window != 0)
149                 return -EINVAL;
150 
151         return 0;
152 }
153 
154 static int verify_newsa_info(struct xfrm_usersa_info *p,
155                              struct nlattr **attrs)
156 {
157         int err;
158 
159         err = -EINVAL;
160         switch (p->family) {
161         case AF_INET:
162                 break;
163 
164         case AF_INET6:
165 #if IS_ENABLED(CONFIG_IPV6)
166                 break;
167 #else
168                 err = -EAFNOSUPPORT;
169                 goto out;
170 #endif
171 
172         default:
173                 goto out;
174         }
175 
176         err = -EINVAL;
177         switch (p->id.proto) {
178         case IPPROTO_AH:
179                 if ((!attrs[XFRMA_ALG_AUTH]     &&
180                      !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
181                     attrs[XFRMA_ALG_AEAD]       ||
182                     attrs[XFRMA_ALG_CRYPT]      ||
183                     attrs[XFRMA_ALG_COMP]       ||
184                     attrs[XFRMA_TFCPAD])
185                         goto out;
186                 break;
187 
188         case IPPROTO_ESP:
189                 if (attrs[XFRMA_ALG_COMP])
190                         goto out;
191                 if (!attrs[XFRMA_ALG_AUTH] &&
192                     !attrs[XFRMA_ALG_AUTH_TRUNC] &&
193                     !attrs[XFRMA_ALG_CRYPT] &&
194                     !attrs[XFRMA_ALG_AEAD])
195                         goto out;
196                 if ((attrs[XFRMA_ALG_AUTH] ||
197                      attrs[XFRMA_ALG_AUTH_TRUNC] ||
198                      attrs[XFRMA_ALG_CRYPT]) &&
199                     attrs[XFRMA_ALG_AEAD])
200                         goto out;
201                 if (attrs[XFRMA_TFCPAD] &&
202                     p->mode != XFRM_MODE_TUNNEL)
203                         goto out;
204                 break;
205 
206         case IPPROTO_COMP:
207                 if (!attrs[XFRMA_ALG_COMP]      ||
208                     attrs[XFRMA_ALG_AEAD]       ||
209                     attrs[XFRMA_ALG_AUTH]       ||
210                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
211                     attrs[XFRMA_ALG_CRYPT]      ||
212                     attrs[XFRMA_TFCPAD])
213                         goto out;
214                 break;
215 
216 #if IS_ENABLED(CONFIG_IPV6)
217         case IPPROTO_DSTOPTS:
218         case IPPROTO_ROUTING:
219                 if (attrs[XFRMA_ALG_COMP]       ||
220                     attrs[XFRMA_ALG_AUTH]       ||
221                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
222                     attrs[XFRMA_ALG_AEAD]       ||
223                     attrs[XFRMA_ALG_CRYPT]      ||
224                     attrs[XFRMA_ENCAP]          ||
225                     attrs[XFRMA_SEC_CTX]        ||
226                     attrs[XFRMA_TFCPAD]         ||
227                     !attrs[XFRMA_COADDR])
228                         goto out;
229                 break;
230 #endif
231 
232         default:
233                 goto out;
234         }
235 
236         if ((err = verify_aead(attrs)))
237                 goto out;
238         if ((err = verify_auth_trunc(attrs)))
239                 goto out;
240         if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
241                 goto out;
242         if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
243                 goto out;
244         if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
245                 goto out;
246         if ((err = verify_sec_ctx_len(attrs)))
247                 goto out;
248         if ((err = verify_replay(p, attrs)))
249                 goto out;
250 
251         err = -EINVAL;
252         switch (p->mode) {
253         case XFRM_MODE_TRANSPORT:
254         case XFRM_MODE_TUNNEL:
255         case XFRM_MODE_ROUTEOPTIMIZATION:
256         case XFRM_MODE_BEET:
257                 break;
258 
259         default:
260                 goto out;
261         }
262 
263         err = 0;
264 
265 out:
266         return err;
267 }
268 
269 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
270                            struct xfrm_algo_desc *(*get_byname)(const char *, int),
271                            struct nlattr *rta)
272 {
273         struct xfrm_algo *p, *ualg;
274         struct xfrm_algo_desc *algo;
275 
276         if (!rta)
277                 return 0;
278 
279         ualg = nla_data(rta);
280 
281         algo = get_byname(ualg->alg_name, 1);
282         if (!algo)
283                 return -ENOSYS;
284         *props = algo->desc.sadb_alg_id;
285 
286         p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
287         if (!p)
288                 return -ENOMEM;
289 
290         strcpy(p->alg_name, algo->name);
291         *algpp = p;
292         return 0;
293 }
294 
295 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
296                        struct nlattr *rta)
297 {
298         struct xfrm_algo *ualg;
299         struct xfrm_algo_auth *p;
300         struct xfrm_algo_desc *algo;
301 
302         if (!rta)
303                 return 0;
304 
305         ualg = nla_data(rta);
306 
307         algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
308         if (!algo)
309                 return -ENOSYS;
310         *props = algo->desc.sadb_alg_id;
311 
312         p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
313         if (!p)
314                 return -ENOMEM;
315 
316         strcpy(p->alg_name, algo->name);
317         p->alg_key_len = ualg->alg_key_len;
318         p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
319         memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
320 
321         *algpp = p;
322         return 0;
323 }
324 
325 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
326                              struct nlattr *rta)
327 {
328         struct xfrm_algo_auth *p, *ualg;
329         struct xfrm_algo_desc *algo;
330 
331         if (!rta)
332                 return 0;
333 
334         ualg = nla_data(rta);
335 
336         algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
337         if (!algo)
338                 return -ENOSYS;
339         if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
340             ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
341                 return -EINVAL;
342         *props = algo->desc.sadb_alg_id;
343 
344         p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
345         if (!p)
346                 return -ENOMEM;
347 
348         strcpy(p->alg_name, algo->name);
349         if (!p->alg_trunc_len)
350                 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
351 
352         *algpp = p;
353         return 0;
354 }
355 
356 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
357                        struct nlattr *rta)
358 {
359         struct xfrm_algo_aead *p, *ualg;
360         struct xfrm_algo_desc *algo;
361 
362         if (!rta)
363                 return 0;
364 
365         ualg = nla_data(rta);
366 
367         algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
368         if (!algo)
369                 return -ENOSYS;
370         *props = algo->desc.sadb_alg_id;
371 
372         p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
373         if (!p)
374                 return -ENOMEM;
375 
376         strcpy(p->alg_name, algo->name);
377         *algpp = p;
378         return 0;
379 }
380 
381 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
382                                          struct nlattr *rp)
383 {
384         struct xfrm_replay_state_esn *up;
385         int ulen;
386 
387         if (!replay_esn || !rp)
388                 return 0;
389 
390         up = nla_data(rp);
391         ulen = xfrm_replay_state_esn_len(up);
392 
393         if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
394                 return -EINVAL;
395 
396         return 0;
397 }
398 
399 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
400                                        struct xfrm_replay_state_esn **preplay_esn,
401                                        struct nlattr *rta)
402 {
403         struct xfrm_replay_state_esn *p, *pp, *up;
404         int klen, ulen;
405 
406         if (!rta)
407                 return 0;
408 
409         up = nla_data(rta);
410         klen = xfrm_replay_state_esn_len(up);
411         ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
412 
413         p = kzalloc(klen, GFP_KERNEL);
414         if (!p)
415                 return -ENOMEM;
416 
417         pp = kzalloc(klen, GFP_KERNEL);
418         if (!pp) {
419                 kfree(p);
420                 return -ENOMEM;
421         }
422 
423         memcpy(p, up, ulen);
424         memcpy(pp, up, ulen);
425 
426         *replay_esn = p;
427         *preplay_esn = pp;
428 
429         return 0;
430 }
431 
432 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
433 {
434         int len = 0;
435 
436         if (xfrm_ctx) {
437                 len += sizeof(struct xfrm_user_sec_ctx);
438                 len += xfrm_ctx->ctx_len;
439         }
440         return len;
441 }
442 
443 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
444 {
445         memcpy(&x->id, &p->id, sizeof(x->id));
446         memcpy(&x->sel, &p->sel, sizeof(x->sel));
447         memcpy(&x->lft, &p->lft, sizeof(x->lft));
448         x->props.mode = p->mode;
449         x->props.replay_window = p->replay_window;
450         x->props.reqid = p->reqid;
451         x->props.family = p->family;
452         memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
453         x->props.flags = p->flags;
454 
455         if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
456                 x->sel.family = p->family;
457 }
458 
459 /*
460  * someday when pfkey also has support, we could have the code
461  * somehow made shareable and move it to xfrm_state.c - JHS
462  *
463 */
464 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
465                                   int update_esn)
466 {
467         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
468         struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
469         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
470         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
471         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
472 
473         if (re) {
474                 struct xfrm_replay_state_esn *replay_esn;
475                 replay_esn = nla_data(re);
476                 memcpy(x->replay_esn, replay_esn,
477                        xfrm_replay_state_esn_len(replay_esn));
478                 memcpy(x->preplay_esn, replay_esn,
479                        xfrm_replay_state_esn_len(replay_esn));
480         }
481 
482         if (rp) {
483                 struct xfrm_replay_state *replay;
484                 replay = nla_data(rp);
485                 memcpy(&x->replay, replay, sizeof(*replay));
486                 memcpy(&x->preplay, replay, sizeof(*replay));
487         }
488 
489         if (lt) {
490                 struct xfrm_lifetime_cur *ltime;
491                 ltime = nla_data(lt);
492                 x->curlft.bytes = ltime->bytes;
493                 x->curlft.packets = ltime->packets;
494                 x->curlft.add_time = ltime->add_time;
495                 x->curlft.use_time = ltime->use_time;
496         }
497 
498         if (et)
499                 x->replay_maxage = nla_get_u32(et);
500 
501         if (rt)
502                 x->replay_maxdiff = nla_get_u32(rt);
503 }
504 
505 static struct xfrm_state *xfrm_state_construct(struct net *net,
506                                                struct xfrm_usersa_info *p,
507                                                struct nlattr **attrs,
508                                                int *errp)
509 {
510         struct xfrm_state *x = xfrm_state_alloc(net);
511         int err = -ENOMEM;
512 
513         if (!x)
514                 goto error_no_put;
515 
516         copy_from_user_state(x, p);
517 
518         if ((err = attach_aead(&x->aead, &x->props.ealgo,
519                                attrs[XFRMA_ALG_AEAD])))
520                 goto error;
521         if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
522                                      attrs[XFRMA_ALG_AUTH_TRUNC])))
523                 goto error;
524         if (!x->props.aalgo) {
525                 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
526                                        attrs[XFRMA_ALG_AUTH])))
527                         goto error;
528         }
529         if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
530                                    xfrm_ealg_get_byname,
531                                    attrs[XFRMA_ALG_CRYPT])))
532                 goto error;
533         if ((err = attach_one_algo(&x->calg, &x->props.calgo,
534                                    xfrm_calg_get_byname,
535                                    attrs[XFRMA_ALG_COMP])))
536                 goto error;
537 
538         if (attrs[XFRMA_ENCAP]) {
539                 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
540                                    sizeof(*x->encap), GFP_KERNEL);
541                 if (x->encap == NULL)
542                         goto error;
543         }
544 
545         if (attrs[XFRMA_TFCPAD])
546                 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
547 
548         if (attrs[XFRMA_COADDR]) {
549                 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
550                                     sizeof(*x->coaddr), GFP_KERNEL);
551                 if (x->coaddr == NULL)
552                         goto error;
553         }
554 
555         xfrm_mark_get(attrs, &x->mark);
556 
557         err = __xfrm_init_state(x, false);
558         if (err)
559                 goto error;
560 
561         if (attrs[XFRMA_SEC_CTX] &&
562             security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
563                 goto error;
564 
565         if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
566                                                attrs[XFRMA_REPLAY_ESN_VAL])))
567                 goto error;
568 
569         x->km.seq = p->seq;
570         x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
571         /* sysctl_xfrm_aevent_etime is in 100ms units */
572         x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
573 
574         if ((err = xfrm_init_replay(x)))
575                 goto error;
576 
577         /* override default values from above */
578         xfrm_update_ae_params(x, attrs, 0);
579 
580         return x;
581 
582 error:
583         x->km.state = XFRM_STATE_DEAD;
584         xfrm_state_put(x);
585 error_no_put:
586         *errp = err;
587         return NULL;
588 }
589 
590 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
591                 struct nlattr **attrs)
592 {
593         struct net *net = sock_net(skb->sk);
594         struct xfrm_usersa_info *p = nlmsg_data(nlh);
595         struct xfrm_state *x;
596         int err;
597         struct km_event c;
598         kuid_t loginuid = audit_get_loginuid(current);
599         u32 sessionid = audit_get_sessionid(current);
600         u32 sid;
601 
602         err = verify_newsa_info(p, attrs);
603         if (err)
604                 return err;
605 
606         x = xfrm_state_construct(net, p, attrs, &err);
607         if (!x)
608                 return err;
609 
610         xfrm_state_hold(x);
611         if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
612                 err = xfrm_state_add(x);
613         else
614                 err = xfrm_state_update(x);
615 
616         security_task_getsecid(current, &sid);
617         xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
618 
619         if (err < 0) {
620                 x->km.state = XFRM_STATE_DEAD;
621                 __xfrm_state_put(x);
622                 goto out;
623         }
624 
625         c.seq = nlh->nlmsg_seq;
626         c.portid = nlh->nlmsg_pid;
627         c.event = nlh->nlmsg_type;
628 
629         km_state_notify(x, &c);
630 out:
631         xfrm_state_put(x);
632         return err;
633 }
634 
635 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
636                                                  struct xfrm_usersa_id *p,
637                                                  struct nlattr **attrs,
638                                                  int *errp)
639 {
640         struct xfrm_state *x = NULL;
641         struct xfrm_mark m;
642         int err;
643         u32 mark = xfrm_mark_get(attrs, &m);
644 
645         if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
646                 err = -ESRCH;
647                 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
648         } else {
649                 xfrm_address_t *saddr = NULL;
650 
651                 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
652                 if (!saddr) {
653                         err = -EINVAL;
654                         goto out;
655                 }
656 
657                 err = -ESRCH;
658                 x = xfrm_state_lookup_byaddr(net, mark,
659                                              &p->daddr, saddr,
660                                              p->proto, p->family);
661         }
662 
663  out:
664         if (!x && errp)
665                 *errp = err;
666         return x;
667 }
668 
669 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
670                 struct nlattr **attrs)
671 {
672         struct net *net = sock_net(skb->sk);
673         struct xfrm_state *x;
674         int err = -ESRCH;
675         struct km_event c;
676         struct xfrm_usersa_id *p = nlmsg_data(nlh);
677         kuid_t loginuid = audit_get_loginuid(current);
678         u32 sessionid = audit_get_sessionid(current);
679         u32 sid;
680 
681         x = xfrm_user_state_lookup(net, p, attrs, &err);
682         if (x == NULL)
683                 return err;
684 
685         if ((err = security_xfrm_state_delete(x)) != 0)
686                 goto out;
687 
688         if (xfrm_state_kern(x)) {
689                 err = -EPERM;
690                 goto out;
691         }
692 
693         err = xfrm_state_delete(x);
694 
695         if (err < 0)
696                 goto out;
697 
698         c.seq = nlh->nlmsg_seq;
699         c.portid = nlh->nlmsg_pid;
700         c.event = nlh->nlmsg_type;
701         km_state_notify(x, &c);
702 
703 out:
704         security_task_getsecid(current, &sid);
705         xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
706         xfrm_state_put(x);
707         return err;
708 }
709 
710 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
711 {
712         memset(p, 0, sizeof(*p));
713         memcpy(&p->id, &x->id, sizeof(p->id));
714         memcpy(&p->sel, &x->sel, sizeof(p->sel));
715         memcpy(&p->lft, &x->lft, sizeof(p->lft));
716         memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
717         memcpy(&p->stats, &x->stats, sizeof(p->stats));
718         memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
719         p->mode = x->props.mode;
720         p->replay_window = x->props.replay_window;
721         p->reqid = x->props.reqid;
722         p->family = x->props.family;
723         p->flags = x->props.flags;
724         p->seq = x->km.seq;
725 }
726 
727 struct xfrm_dump_info {
728         struct sk_buff *in_skb;
729         struct sk_buff *out_skb;
730         u32 nlmsg_seq;
731         u16 nlmsg_flags;
732 };
733 
734 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
735 {
736         struct xfrm_user_sec_ctx *uctx;
737         struct nlattr *attr;
738         int ctx_size = sizeof(*uctx) + s->ctx_len;
739 
740         attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
741         if (attr == NULL)
742                 return -EMSGSIZE;
743 
744         uctx = nla_data(attr);
745         uctx->exttype = XFRMA_SEC_CTX;
746         uctx->len = ctx_size;
747         uctx->ctx_doi = s->ctx_doi;
748         uctx->ctx_alg = s->ctx_alg;
749         uctx->ctx_len = s->ctx_len;
750         memcpy(uctx + 1, s->ctx_str, s->ctx_len);
751 
752         return 0;
753 }
754 
755 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
756 {
757         struct xfrm_algo *algo;
758         struct nlattr *nla;
759 
760         nla = nla_reserve(skb, XFRMA_ALG_AUTH,
761                           sizeof(*algo) + (auth->alg_key_len + 7) / 8);
762         if (!nla)
763                 return -EMSGSIZE;
764 
765         algo = nla_data(nla);
766         strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
767         memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
768         algo->alg_key_len = auth->alg_key_len;
769 
770         return 0;
771 }
772 
773 /* Don't change this without updating xfrm_sa_len! */
774 static int copy_to_user_state_extra(struct xfrm_state *x,
775                                     struct xfrm_usersa_info *p,
776                                     struct sk_buff *skb)
777 {
778         int ret = 0;
779 
780         copy_to_user_state(x, p);
781 
782         if (x->coaddr) {
783                 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
784                 if (ret)
785                         goto out;
786         }
787         if (x->lastused) {
788                 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
789                 if (ret)
790                         goto out;
791         }
792         if (x->aead) {
793                 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
794                 if (ret)
795                         goto out;
796         }
797         if (x->aalg) {
798                 ret = copy_to_user_auth(x->aalg, skb);
799                 if (!ret)
800                         ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
801                                       xfrm_alg_auth_len(x->aalg), x->aalg);
802                 if (ret)
803                         goto out;
804         }
805         if (x->ealg) {
806                 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
807                 if (ret)
808                         goto out;
809         }
810         if (x->calg) {
811                 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
812                 if (ret)
813                         goto out;
814         }
815         if (x->encap) {
816                 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
817                 if (ret)
818                         goto out;
819         }
820         if (x->tfcpad) {
821                 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
822                 if (ret)
823                         goto out;
824         }
825         ret = xfrm_mark_put(skb, &x->mark);
826         if (ret)
827                 goto out;
828         if (x->replay_esn) {
829                 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
830                               xfrm_replay_state_esn_len(x->replay_esn),
831                               x->replay_esn);
832                 if (ret)
833                         goto out;
834         }
835         if (x->security)
836                 ret = copy_sec_ctx(x->security, skb);
837 out:
838         return ret;
839 }
840 
841 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
842 {
843         struct xfrm_dump_info *sp = ptr;
844         struct sk_buff *in_skb = sp->in_skb;
845         struct sk_buff *skb = sp->out_skb;
846         struct xfrm_usersa_info *p;
847         struct nlmsghdr *nlh;
848         int err;
849 
850         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
851                         XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
852         if (nlh == NULL)
853                 return -EMSGSIZE;
854 
855         p = nlmsg_data(nlh);
856 
857         err = copy_to_user_state_extra(x, p, skb);
858         if (err) {
859                 nlmsg_cancel(skb, nlh);
860                 return err;
861         }
862         nlmsg_end(skb, nlh);
863         return 0;
864 }
865 
866 static int xfrm_dump_sa_done(struct netlink_callback *cb)
867 {
868         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
869         xfrm_state_walk_done(walk);
870         return 0;
871 }
872 
873 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
874 {
875         struct net *net = sock_net(skb->sk);
876         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
877         struct xfrm_dump_info info;
878 
879         BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
880                      sizeof(cb->args) - sizeof(cb->args[0]));
881 
882         info.in_skb = cb->skb;
883         info.out_skb = skb;
884         info.nlmsg_seq = cb->nlh->nlmsg_seq;
885         info.nlmsg_flags = NLM_F_MULTI;
886 
887         if (!cb->args[0]) {
888                 cb->args[0] = 1;
889                 xfrm_state_walk_init(walk, 0);
890         }
891 
892         (void) xfrm_state_walk(net, walk, dump_one_state, &info);
893 
894         return skb->len;
895 }
896 
897 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
898                                           struct xfrm_state *x, u32 seq)
899 {
900         struct xfrm_dump_info info;
901         struct sk_buff *skb;
902         int err;
903 
904         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
905         if (!skb)
906                 return ERR_PTR(-ENOMEM);
907 
908         info.in_skb = in_skb;
909         info.out_skb = skb;
910         info.nlmsg_seq = seq;
911         info.nlmsg_flags = 0;
912 
913         err = dump_one_state(x, 0, &info);
914         if (err) {
915                 kfree_skb(skb);
916                 return ERR_PTR(err);
917         }
918 
919         return skb;
920 }
921 
922 static inline size_t xfrm_spdinfo_msgsize(void)
923 {
924         return NLMSG_ALIGN(4)
925                + nla_total_size(sizeof(struct xfrmu_spdinfo))
926                + nla_total_size(sizeof(struct xfrmu_spdhinfo));
927 }
928 
929 static int build_spdinfo(struct sk_buff *skb, struct net *net,
930                          u32 portid, u32 seq, u32 flags)
931 {
932         struct xfrmk_spdinfo si;
933         struct xfrmu_spdinfo spc;
934         struct xfrmu_spdhinfo sph;
935         struct nlmsghdr *nlh;
936         int err;
937         u32 *f;
938 
939         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
940         if (nlh == NULL) /* shouldn't really happen ... */
941                 return -EMSGSIZE;
942 
943         f = nlmsg_data(nlh);
944         *f = flags;
945         xfrm_spd_getinfo(net, &si);
946         spc.incnt = si.incnt;
947         spc.outcnt = si.outcnt;
948         spc.fwdcnt = si.fwdcnt;
949         spc.inscnt = si.inscnt;
950         spc.outscnt = si.outscnt;
951         spc.fwdscnt = si.fwdscnt;
952         sph.spdhcnt = si.spdhcnt;
953         sph.spdhmcnt = si.spdhmcnt;
954 
955         err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
956         if (!err)
957                 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
958         if (err) {
959                 nlmsg_cancel(skb, nlh);
960                 return err;
961         }
962 
963         return nlmsg_end(skb, nlh);
964 }
965 
966 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
967                 struct nlattr **attrs)
968 {
969         struct net *net = sock_net(skb->sk);
970         struct sk_buff *r_skb;
971         u32 *flags = nlmsg_data(nlh);
972         u32 sportid = NETLINK_CB(skb).portid;
973         u32 seq = nlh->nlmsg_seq;
974 
975         r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
976         if (r_skb == NULL)
977                 return -ENOMEM;
978 
979         if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
980                 BUG();
981 
982         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
983 }
984 
985 static inline size_t xfrm_sadinfo_msgsize(void)
986 {
987         return NLMSG_ALIGN(4)
988                + nla_total_size(sizeof(struct xfrmu_sadhinfo))
989                + nla_total_size(4); /* XFRMA_SAD_CNT */
990 }
991 
992 static int build_sadinfo(struct sk_buff *skb, struct net *net,
993                          u32 portid, u32 seq, u32 flags)
994 {
995         struct xfrmk_sadinfo si;
996         struct xfrmu_sadhinfo sh;
997         struct nlmsghdr *nlh;
998         int err;
999         u32 *f;
1000 
1001         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1002         if (nlh == NULL) /* shouldn't really happen ... */
1003                 return -EMSGSIZE;
1004 
1005         f = nlmsg_data(nlh);
1006         *f = flags;
1007         xfrm_sad_getinfo(net, &si);
1008 
1009         sh.sadhmcnt = si.sadhmcnt;
1010         sh.sadhcnt = si.sadhcnt;
1011 
1012         err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1013         if (!err)
1014                 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1015         if (err) {
1016                 nlmsg_cancel(skb, nlh);
1017                 return err;
1018         }
1019 
1020         return nlmsg_end(skb, nlh);
1021 }
1022 
1023 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1024                 struct nlattr **attrs)
1025 {
1026         struct net *net = sock_net(skb->sk);
1027         struct sk_buff *r_skb;
1028         u32 *flags = nlmsg_data(nlh);
1029         u32 sportid = NETLINK_CB(skb).portid;
1030         u32 seq = nlh->nlmsg_seq;
1031 
1032         r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1033         if (r_skb == NULL)
1034                 return -ENOMEM;
1035 
1036         if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1037                 BUG();
1038 
1039         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1040 }
1041 
1042 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1043                 struct nlattr **attrs)
1044 {
1045         struct net *net = sock_net(skb->sk);
1046         struct xfrm_usersa_id *p = nlmsg_data(nlh);
1047         struct xfrm_state *x;
1048         struct sk_buff *resp_skb;
1049         int err = -ESRCH;
1050 
1051         x = xfrm_user_state_lookup(net, p, attrs, &err);
1052         if (x == NULL)
1053                 goto out_noput;
1054 
1055         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1056         if (IS_ERR(resp_skb)) {
1057                 err = PTR_ERR(resp_skb);
1058         } else {
1059                 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1060         }
1061         xfrm_state_put(x);
1062 out_noput:
1063         return err;
1064 }
1065 
1066 static int verify_userspi_info(struct xfrm_userspi_info *p)
1067 {
1068         switch (p->info.id.proto) {
1069         case IPPROTO_AH:
1070         case IPPROTO_ESP:
1071                 break;
1072 
1073         case IPPROTO_COMP:
1074                 /* IPCOMP spi is 16-bits. */
1075                 if (p->max >= 0x10000)
1076                         return -EINVAL;
1077                 break;
1078 
1079         default:
1080                 return -EINVAL;
1081         }
1082 
1083         if (p->min > p->max)
1084                 return -EINVAL;
1085 
1086         return 0;
1087 }
1088 
1089 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1090                 struct nlattr **attrs)
1091 {
1092         struct net *net = sock_net(skb->sk);
1093         struct xfrm_state *x;
1094         struct xfrm_userspi_info *p;
1095         struct sk_buff *resp_skb;
1096         xfrm_address_t *daddr;
1097         int family;
1098         int err;
1099         u32 mark;
1100         struct xfrm_mark m;
1101 
1102         p = nlmsg_data(nlh);
1103         err = verify_userspi_info(p);
1104         if (err)
1105                 goto out_noput;
1106 
1107         family = p->info.family;
1108         daddr = &p->info.id.daddr;
1109 
1110         x = NULL;
1111 
1112         mark = xfrm_mark_get(attrs, &m);
1113         if (p->info.seq) {
1114                 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1115                 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1116                         xfrm_state_put(x);
1117                         x = NULL;
1118                 }
1119         }
1120 
1121         if (!x)
1122                 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1123                                   p->info.id.proto, daddr,
1124                                   &p->info.saddr, 1,
1125                                   family);
1126         err = -ENOENT;
1127         if (x == NULL)
1128                 goto out_noput;
1129 
1130         err = xfrm_alloc_spi(x, p->min, p->max);
1131         if (err)
1132                 goto out;
1133 
1134         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1135         if (IS_ERR(resp_skb)) {
1136                 err = PTR_ERR(resp_skb);
1137                 goto out;
1138         }
1139 
1140         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1141 
1142 out:
1143         xfrm_state_put(x);
1144 out_noput:
1145         return err;
1146 }
1147 
1148 static int verify_policy_dir(u8 dir)
1149 {
1150         switch (dir) {
1151         case XFRM_POLICY_IN:
1152         case XFRM_POLICY_OUT:
1153         case XFRM_POLICY_FWD:
1154                 break;
1155 
1156         default:
1157                 return -EINVAL;
1158         }
1159 
1160         return 0;
1161 }
1162 
1163 static int verify_policy_type(u8 type)
1164 {
1165         switch (type) {
1166         case XFRM_POLICY_TYPE_MAIN:
1167 #ifdef CONFIG_XFRM_SUB_POLICY
1168         case XFRM_POLICY_TYPE_SUB:
1169 #endif
1170                 break;
1171 
1172         default:
1173                 return -EINVAL;
1174         }
1175 
1176         return 0;
1177 }
1178 
1179 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1180 {
1181         switch (p->share) {
1182         case XFRM_SHARE_ANY:
1183         case XFRM_SHARE_SESSION:
1184         case XFRM_SHARE_USER:
1185         case XFRM_SHARE_UNIQUE:
1186                 break;
1187 
1188         default:
1189                 return -EINVAL;
1190         }
1191 
1192         switch (p->action) {
1193         case XFRM_POLICY_ALLOW:
1194         case XFRM_POLICY_BLOCK:
1195                 break;
1196 
1197         default:
1198                 return -EINVAL;
1199         }
1200 
1201         switch (p->sel.family) {
1202         case AF_INET:
1203                 break;
1204 
1205         case AF_INET6:
1206 #if IS_ENABLED(CONFIG_IPV6)
1207                 break;
1208 #else
1209                 return  -EAFNOSUPPORT;
1210 #endif
1211 
1212         default:
1213                 return -EINVAL;
1214         }
1215 
1216         return verify_policy_dir(p->dir);
1217 }
1218 
1219 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1220 {
1221         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1222         struct xfrm_user_sec_ctx *uctx;
1223 
1224         if (!rt)
1225                 return 0;
1226 
1227         uctx = nla_data(rt);
1228         return security_xfrm_policy_alloc(&pol->security, uctx);
1229 }
1230 
1231 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1232                            int nr)
1233 {
1234         int i;
1235 
1236         xp->xfrm_nr = nr;
1237         for (i = 0; i < nr; i++, ut++) {
1238                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1239 
1240                 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1241                 memcpy(&t->saddr, &ut->saddr,
1242                        sizeof(xfrm_address_t));
1243                 t->reqid = ut->reqid;
1244                 t->mode = ut->mode;
1245                 t->share = ut->share;
1246                 t->optional = ut->optional;
1247                 t->aalgos = ut->aalgos;
1248                 t->ealgos = ut->ealgos;
1249                 t->calgos = ut->calgos;
1250                 /* If all masks are ~0, then we allow all algorithms. */
1251                 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1252                 t->encap_family = ut->family;
1253         }
1254 }
1255 
1256 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1257 {
1258         int i;
1259 
1260         if (nr > XFRM_MAX_DEPTH)
1261                 return -EINVAL;
1262 
1263         for (i = 0; i < nr; i++) {
1264                 /* We never validated the ut->family value, so many
1265                  * applications simply leave it at zero.  The check was
1266                  * never made and ut->family was ignored because all
1267                  * templates could be assumed to have the same family as
1268                  * the policy itself.  Now that we will have ipv4-in-ipv6
1269                  * and ipv6-in-ipv4 tunnels, this is no longer true.
1270                  */
1271                 if (!ut[i].family)
1272                         ut[i].family = family;
1273 
1274                 switch (ut[i].family) {
1275                 case AF_INET:
1276                         break;
1277 #if IS_ENABLED(CONFIG_IPV6)
1278                 case AF_INET6:
1279                         break;
1280 #endif
1281                 default:
1282                         return -EINVAL;
1283                 }
1284         }
1285 
1286         return 0;
1287 }
1288 
1289 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1290 {
1291         struct nlattr *rt = attrs[XFRMA_TMPL];
1292 
1293         if (!rt) {
1294                 pol->xfrm_nr = 0;
1295         } else {
1296                 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1297                 int nr = nla_len(rt) / sizeof(*utmpl);
1298                 int err;
1299 
1300                 err = validate_tmpl(nr, utmpl, pol->family);
1301                 if (err)
1302                         return err;
1303 
1304                 copy_templates(pol, utmpl, nr);
1305         }
1306         return 0;
1307 }
1308 
1309 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1310 {
1311         struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1312         struct xfrm_userpolicy_type *upt;
1313         u8 type = XFRM_POLICY_TYPE_MAIN;
1314         int err;
1315 
1316         if (rt) {
1317                 upt = nla_data(rt);
1318                 type = upt->type;
1319         }
1320 
1321         err = verify_policy_type(type);
1322         if (err)
1323                 return err;
1324 
1325         *tp = type;
1326         return 0;
1327 }
1328 
1329 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1330 {
1331         xp->priority = p->priority;
1332         xp->index = p->index;
1333         memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1334         memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1335         xp->action = p->action;
1336         xp->flags = p->flags;
1337         xp->family = p->sel.family;
1338         /* XXX xp->share = p->share; */
1339 }
1340 
1341 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1342 {
1343         memset(p, 0, sizeof(*p));
1344         memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1345         memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1346         memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1347         p->priority = xp->priority;
1348         p->index = xp->index;
1349         p->sel.family = xp->family;
1350         p->dir = dir;
1351         p->action = xp->action;
1352         p->flags = xp->flags;
1353         p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1354 }
1355 
1356 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1357 {
1358         struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1359         int err;
1360 
1361         if (!xp) {
1362                 *errp = -ENOMEM;
1363                 return NULL;
1364         }
1365 
1366         copy_from_user_policy(xp, p);
1367 
1368         err = copy_from_user_policy_type(&xp->type, attrs);
1369         if (err)
1370                 goto error;
1371 
1372         if (!(err = copy_from_user_tmpl(xp, attrs)))
1373                 err = copy_from_user_sec_ctx(xp, attrs);
1374         if (err)
1375                 goto error;
1376 
1377         xfrm_mark_get(attrs, &xp->mark);
1378 
1379         return xp;
1380  error:
1381         *errp = err;
1382         xp->walk.dead = 1;
1383         xfrm_policy_destroy(xp);
1384         return NULL;
1385 }
1386 
1387 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1388                 struct nlattr **attrs)
1389 {
1390         struct net *net = sock_net(skb->sk);
1391         struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1392         struct xfrm_policy *xp;
1393         struct km_event c;
1394         int err;
1395         int excl;
1396         kuid_t loginuid = audit_get_loginuid(current);
1397         u32 sessionid = audit_get_sessionid(current);
1398         u32 sid;
1399 
1400         err = verify_newpolicy_info(p);
1401         if (err)
1402                 return err;
1403         err = verify_sec_ctx_len(attrs);
1404         if (err)
1405                 return err;
1406 
1407         xp = xfrm_policy_construct(net, p, attrs, &err);
1408         if (!xp)
1409                 return err;
1410 
1411         /* shouldn't excl be based on nlh flags??
1412          * Aha! this is anti-netlink really i.e  more pfkey derived
1413          * in netlink excl is a flag and you wouldnt need
1414          * a type XFRM_MSG_UPDPOLICY - JHS */
1415         excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1416         err = xfrm_policy_insert(p->dir, xp, excl);
1417         security_task_getsecid(current, &sid);
1418         xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1419 
1420         if (err) {
1421                 security_xfrm_policy_free(xp->security);
1422                 kfree(xp);
1423                 return err;
1424         }
1425 
1426         c.event = nlh->nlmsg_type;
1427         c.seq = nlh->nlmsg_seq;
1428         c.portid = nlh->nlmsg_pid;
1429         km_policy_notify(xp, p->dir, &c);
1430 
1431         xfrm_pol_put(xp);
1432 
1433         return 0;
1434 }
1435 
1436 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1437 {
1438         struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1439         int i;
1440 
1441         if (xp->xfrm_nr == 0)
1442                 return 0;
1443 
1444         for (i = 0; i < xp->xfrm_nr; i++) {
1445                 struct xfrm_user_tmpl *up = &vec[i];
1446                 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1447 
1448                 memset(up, 0, sizeof(*up));
1449                 memcpy(&up->id, &kp->id, sizeof(up->id));
1450                 up->family = kp->encap_family;
1451                 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1452                 up->reqid = kp->reqid;
1453                 up->mode = kp->mode;
1454                 up->share = kp->share;
1455                 up->optional = kp->optional;
1456                 up->aalgos = kp->aalgos;
1457                 up->ealgos = kp->ealgos;
1458                 up->calgos = kp->calgos;
1459         }
1460 
1461         return nla_put(skb, XFRMA_TMPL,
1462                        sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1463 }
1464 
1465 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1466 {
1467         if (x->security) {
1468                 return copy_sec_ctx(x->security, skb);
1469         }
1470         return 0;
1471 }
1472 
1473 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1474 {
1475         if (xp->security)
1476                 return copy_sec_ctx(xp->security, skb);
1477         return 0;
1478 }
1479 static inline size_t userpolicy_type_attrsize(void)
1480 {
1481 #ifdef CONFIG_XFRM_SUB_POLICY
1482         return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1483 #else
1484         return 0;
1485 #endif
1486 }
1487 
1488 #ifdef CONFIG_XFRM_SUB_POLICY
1489 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1490 {
1491         struct xfrm_userpolicy_type upt = {
1492                 .type = type,
1493         };
1494 
1495         return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1496 }
1497 
1498 #else
1499 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1500 {
1501         return 0;
1502 }
1503 #endif
1504 
1505 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1506 {
1507         struct xfrm_dump_info *sp = ptr;
1508         struct xfrm_userpolicy_info *p;
1509         struct sk_buff *in_skb = sp->in_skb;
1510         struct sk_buff *skb = sp->out_skb;
1511         struct nlmsghdr *nlh;
1512         int err;
1513 
1514         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1515                         XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1516         if (nlh == NULL)
1517                 return -EMSGSIZE;
1518 
1519         p = nlmsg_data(nlh);
1520         copy_to_user_policy(xp, p, dir);
1521         err = copy_to_user_tmpl(xp, skb);
1522         if (!err)
1523                 err = copy_to_user_sec_ctx(xp, skb);
1524         if (!err)
1525                 err = copy_to_user_policy_type(xp->type, skb);
1526         if (!err)
1527                 err = xfrm_mark_put(skb, &xp->mark);
1528         if (err) {
1529                 nlmsg_cancel(skb, nlh);
1530                 return err;
1531         }
1532         nlmsg_end(skb, nlh);
1533         return 0;
1534 }
1535 
1536 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1537 {
1538         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1539 
1540         xfrm_policy_walk_done(walk);
1541         return 0;
1542 }
1543 
1544 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1545 {
1546         struct net *net = sock_net(skb->sk);
1547         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1548         struct xfrm_dump_info info;
1549 
1550         BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1551                      sizeof(cb->args) - sizeof(cb->args[0]));
1552 
1553         info.in_skb = cb->skb;
1554         info.out_skb = skb;
1555         info.nlmsg_seq = cb->nlh->nlmsg_seq;
1556         info.nlmsg_flags = NLM_F_MULTI;
1557 
1558         if (!cb->args[0]) {
1559                 cb->args[0] = 1;
1560                 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1561         }
1562 
1563         (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1564 
1565         return skb->len;
1566 }
1567 
1568 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1569                                           struct xfrm_policy *xp,
1570                                           int dir, u32 seq)
1571 {
1572         struct xfrm_dump_info info;
1573         struct sk_buff *skb;
1574         int err;
1575 
1576         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1577         if (!skb)
1578                 return ERR_PTR(-ENOMEM);
1579 
1580         info.in_skb = in_skb;
1581         info.out_skb = skb;
1582         info.nlmsg_seq = seq;
1583         info.nlmsg_flags = 0;
1584 
1585         err = dump_one_policy(xp, dir, 0, &info);
1586         if (err) {
1587                 kfree_skb(skb);
1588                 return ERR_PTR(err);
1589         }
1590 
1591         return skb;
1592 }
1593 
1594 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1595                 struct nlattr **attrs)
1596 {
1597         struct net *net = sock_net(skb->sk);
1598         struct xfrm_policy *xp;
1599         struct xfrm_userpolicy_id *p;
1600         u8 type = XFRM_POLICY_TYPE_MAIN;
1601         int err;
1602         struct km_event c;
1603         int delete;
1604         struct xfrm_mark m;
1605         u32 mark = xfrm_mark_get(attrs, &m);
1606 
1607         p = nlmsg_data(nlh);
1608         delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1609 
1610         err = copy_from_user_policy_type(&type, attrs);
1611         if (err)
1612                 return err;
1613 
1614         err = verify_policy_dir(p->dir);
1615         if (err)
1616                 return err;
1617 
1618         if (p->index)
1619                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1620         else {
1621                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1622                 struct xfrm_sec_ctx *ctx;
1623 
1624                 err = verify_sec_ctx_len(attrs);
1625                 if (err)
1626                         return err;
1627 
1628                 ctx = NULL;
1629                 if (rt) {
1630                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1631 
1632                         err = security_xfrm_policy_alloc(&ctx, uctx);
1633                         if (err)
1634                                 return err;
1635                 }
1636                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1637                                            ctx, delete, &err);
1638                 security_xfrm_policy_free(ctx);
1639         }
1640         if (xp == NULL)
1641                 return -ENOENT;
1642 
1643         if (!delete) {
1644                 struct sk_buff *resp_skb;
1645 
1646                 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1647                 if (IS_ERR(resp_skb)) {
1648                         err = PTR_ERR(resp_skb);
1649                 } else {
1650                         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1651                                             NETLINK_CB(skb).portid);
1652                 }
1653         } else {
1654                 kuid_t loginuid = audit_get_loginuid(current);
1655                 u32 sessionid = audit_get_sessionid(current);
1656                 u32 sid;
1657 
1658                 security_task_getsecid(current, &sid);
1659                 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1660                                          sid);
1661 
1662                 if (err != 0)
1663                         goto out;
1664 
1665                 c.data.byid = p->index;
1666                 c.event = nlh->nlmsg_type;
1667                 c.seq = nlh->nlmsg_seq;
1668                 c.portid = nlh->nlmsg_pid;
1669                 km_policy_notify(xp, p->dir, &c);
1670         }
1671 
1672 out:
1673         xfrm_pol_put(xp);
1674         return err;
1675 }
1676 
1677 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1678                 struct nlattr **attrs)
1679 {
1680         struct net *net = sock_net(skb->sk);
1681         struct km_event c;
1682         struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1683         struct xfrm_audit audit_info;
1684         int err;
1685 
1686         audit_info.loginuid = audit_get_loginuid(current);
1687         audit_info.sessionid = audit_get_sessionid(current);
1688         security_task_getsecid(current, &audit_info.secid);
1689         err = xfrm_state_flush(net, p->proto, &audit_info);
1690         if (err) {
1691                 if (err == -ESRCH) /* empty table */
1692                         return 0;
1693                 return err;
1694         }
1695         c.data.proto = p->proto;
1696         c.event = nlh->nlmsg_type;
1697         c.seq = nlh->nlmsg_seq;
1698         c.portid = nlh->nlmsg_pid;
1699         c.net = net;
1700         km_state_notify(NULL, &c);
1701 
1702         return 0;
1703 }
1704 
1705 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1706 {
1707         size_t replay_size = x->replay_esn ?
1708                               xfrm_replay_state_esn_len(x->replay_esn) :
1709                               sizeof(struct xfrm_replay_state);
1710 
1711         return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1712                + nla_total_size(replay_size)
1713                + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1714                + nla_total_size(sizeof(struct xfrm_mark))
1715                + nla_total_size(4) /* XFRM_AE_RTHR */
1716                + nla_total_size(4); /* XFRM_AE_ETHR */
1717 }
1718 
1719 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1720 {
1721         struct xfrm_aevent_id *id;
1722         struct nlmsghdr *nlh;
1723         int err;
1724 
1725         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1726         if (nlh == NULL)
1727                 return -EMSGSIZE;
1728 
1729         id = nlmsg_data(nlh);
1730         memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1731         id->sa_id.spi = x->id.spi;
1732         id->sa_id.family = x->props.family;
1733         id->sa_id.proto = x->id.proto;
1734         memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1735         id->reqid = x->props.reqid;
1736         id->flags = c->data.aevent;
1737 
1738         if (x->replay_esn) {
1739                 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1740                               xfrm_replay_state_esn_len(x->replay_esn),
1741                               x->replay_esn);
1742         } else {
1743                 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1744                               &x->replay);
1745         }
1746         if (err)
1747                 goto out_cancel;
1748         err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1749         if (err)
1750                 goto out_cancel;
1751 
1752         if (id->flags & XFRM_AE_RTHR) {
1753                 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1754                 if (err)
1755                         goto out_cancel;
1756         }
1757         if (id->flags & XFRM_AE_ETHR) {
1758                 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1759                                   x->replay_maxage * 10 / HZ);
1760                 if (err)
1761                         goto out_cancel;
1762         }
1763         err = xfrm_mark_put(skb, &x->mark);
1764         if (err)
1765                 goto out_cancel;
1766 
1767         return nlmsg_end(skb, nlh);
1768 
1769 out_cancel:
1770         nlmsg_cancel(skb, nlh);
1771         return err;
1772 }
1773 
1774 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1775                 struct nlattr **attrs)
1776 {
1777         struct net *net = sock_net(skb->sk);
1778         struct xfrm_state *x;
1779         struct sk_buff *r_skb;
1780         int err;
1781         struct km_event c;
1782         u32 mark;
1783         struct xfrm_mark m;
1784         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1785         struct xfrm_usersa_id *id = &p->sa_id;
1786 
1787         mark = xfrm_mark_get(attrs, &m);
1788 
1789         x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1790         if (x == NULL)
1791                 return -ESRCH;
1792 
1793         r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1794         if (r_skb == NULL) {
1795                 xfrm_state_put(x);
1796                 return -ENOMEM;
1797         }
1798 
1799         /*
1800          * XXX: is this lock really needed - none of the other
1801          * gets lock (the concern is things getting updated
1802          * while we are still reading) - jhs
1803         */
1804         spin_lock_bh(&x->lock);
1805         c.data.aevent = p->flags;
1806         c.seq = nlh->nlmsg_seq;
1807         c.portid = nlh->nlmsg_pid;
1808 
1809         if (build_aevent(r_skb, x, &c) < 0)
1810                 BUG();
1811         err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1812         spin_unlock_bh(&x->lock);
1813         xfrm_state_put(x);
1814         return err;
1815 }
1816 
1817 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1818                 struct nlattr **attrs)
1819 {
1820         struct net *net = sock_net(skb->sk);
1821         struct xfrm_state *x;
1822         struct km_event c;
1823         int err = - EINVAL;
1824         u32 mark = 0;
1825         struct xfrm_mark m;
1826         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1827         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1828         struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1829         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1830 
1831         if (!lt && !rp && !re)
1832                 return err;
1833 
1834         /* pedantic mode - thou shalt sayeth replaceth */
1835         if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1836                 return err;
1837 
1838         mark = xfrm_mark_get(attrs, &m);
1839 
1840         x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1841         if (x == NULL)
1842                 return -ESRCH;
1843 
1844         if (x->km.state != XFRM_STATE_VALID)
1845                 goto out;
1846 
1847         err = xfrm_replay_verify_len(x->replay_esn, rp);
1848         if (err)
1849                 goto out;
1850 
1851         spin_lock_bh(&x->lock);
1852         xfrm_update_ae_params(x, attrs, 1);
1853         spin_unlock_bh(&x->lock);
1854 
1855         c.event = nlh->nlmsg_type;
1856         c.seq = nlh->nlmsg_seq;
1857         c.portid = nlh->nlmsg_pid;
1858         c.data.aevent = XFRM_AE_CU;
1859         km_state_notify(x, &c);
1860         err = 0;
1861 out:
1862         xfrm_state_put(x);
1863         return err;
1864 }
1865 
1866 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1867                 struct nlattr **attrs)
1868 {
1869         struct net *net = sock_net(skb->sk);
1870         struct km_event c;
1871         u8 type = XFRM_POLICY_TYPE_MAIN;
1872         int err;
1873         struct xfrm_audit audit_info;
1874 
1875         err = copy_from_user_policy_type(&type, attrs);
1876         if (err)
1877                 return err;
1878 
1879         audit_info.loginuid = audit_get_loginuid(current);
1880         audit_info.sessionid = audit_get_sessionid(current);
1881         security_task_getsecid(current, &audit_info.secid);
1882         err = xfrm_policy_flush(net, type, &audit_info);
1883         if (err) {
1884                 if (err == -ESRCH) /* empty table */
1885                         return 0;
1886                 return err;
1887         }
1888 
1889         c.data.type = type;
1890         c.event = nlh->nlmsg_type;
1891         c.seq = nlh->nlmsg_seq;
1892         c.portid = nlh->nlmsg_pid;
1893         c.net = net;
1894         km_policy_notify(NULL, 0, &c);
1895         return 0;
1896 }
1897 
1898 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1899                 struct nlattr **attrs)
1900 {
1901         struct net *net = sock_net(skb->sk);
1902         struct xfrm_policy *xp;
1903         struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1904         struct xfrm_userpolicy_info *p = &up->pol;
1905         u8 type = XFRM_POLICY_TYPE_MAIN;
1906         int err = -ENOENT;
1907         struct xfrm_mark m;
1908         u32 mark = xfrm_mark_get(attrs, &m);
1909 
1910         err = copy_from_user_policy_type(&type, attrs);
1911         if (err)
1912                 return err;
1913 
1914         err = verify_policy_dir(p->dir);
1915         if (err)
1916                 return err;
1917 
1918         if (p->index)
1919                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1920         else {
1921                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1922                 struct xfrm_sec_ctx *ctx;
1923 
1924                 err = verify_sec_ctx_len(attrs);
1925                 if (err)
1926                         return err;
1927 
1928                 ctx = NULL;
1929                 if (rt) {
1930                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1931 
1932                         err = security_xfrm_policy_alloc(&ctx, uctx);
1933                         if (err)
1934                                 return err;
1935                 }
1936                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1937                                            &p->sel, ctx, 0, &err);
1938                 security_xfrm_policy_free(ctx);
1939         }
1940         if (xp == NULL)
1941                 return -ENOENT;
1942 
1943         if (unlikely(xp->walk.dead))
1944                 goto out;
1945 
1946         err = 0;
1947         if (up->hard) {
1948                 kuid_t loginuid = audit_get_loginuid(current);
1949                 u32 sessionid = audit_get_sessionid(current);
1950                 u32 sid;
1951 
1952                 security_task_getsecid(current, &sid);
1953                 xfrm_policy_delete(xp, p->dir);
1954                 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1955 
1956         } else {
1957                 // reset the timers here?
1958                 WARN(1, "Dont know what to do with soft policy expire\n");
1959         }
1960         km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1961 
1962 out:
1963         xfrm_pol_put(xp);
1964         return err;
1965 }
1966 
1967 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1968                 struct nlattr **attrs)
1969 {
1970         struct net *net = sock_net(skb->sk);
1971         struct xfrm_state *x;
1972         int err;
1973         struct xfrm_user_expire *ue = nlmsg_data(nlh);
1974         struct xfrm_usersa_info *p = &ue->state;
1975         struct xfrm_mark m;
1976         u32 mark = xfrm_mark_get(attrs, &m);
1977 
1978         x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1979 
1980         err = -ENOENT;
1981         if (x == NULL)
1982                 return err;
1983 
1984         spin_lock_bh(&x->lock);
1985         err = -EINVAL;
1986         if (x->km.state != XFRM_STATE_VALID)
1987                 goto out;
1988         km_state_expired(x, ue->hard, nlh->nlmsg_pid);
1989 
1990         if (ue->hard) {
1991                 kuid_t loginuid = audit_get_loginuid(current);
1992                 u32 sessionid = audit_get_sessionid(current);
1993                 u32 sid;
1994 
1995                 security_task_getsecid(current, &sid);
1996                 __xfrm_state_delete(x);
1997                 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1998         }
1999         err = 0;
2000 out:
2001         spin_unlock_bh(&x->lock);
2002         xfrm_state_put(x);
2003         return err;
2004 }
2005 
2006 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2007                 struct nlattr **attrs)
2008 {
2009         struct net *net = sock_net(skb->sk);
2010         struct xfrm_policy *xp;
2011         struct xfrm_user_tmpl *ut;
2012         int i;
2013         struct nlattr *rt = attrs[XFRMA_TMPL];
2014         struct xfrm_mark mark;
2015 
2016         struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2017         struct xfrm_state *x = xfrm_state_alloc(net);
2018         int err = -ENOMEM;
2019 
2020         if (!x)
2021                 goto nomem;
2022 
2023         xfrm_mark_get(attrs, &mark);
2024 
2025         err = verify_newpolicy_info(&ua->policy);
2026         if (err)
2027                 goto bad_policy;
2028 
2029         /*   build an XP */
2030         xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2031         if (!xp)
2032                 goto free_state;
2033 
2034         memcpy(&x->id, &ua->id, sizeof(ua->id));
2035         memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2036         memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2037         xp->mark.m = x->mark.m = mark.m;
2038         xp->mark.v = x->mark.v = mark.v;
2039         ut = nla_data(rt);
2040         /* extract the templates and for each call km_key */
2041         for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2042                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2043                 memcpy(&x->id, &t->id, sizeof(x->id));
2044                 x->props.mode = t->mode;
2045                 x->props.reqid = t->reqid;
2046                 x->props.family = ut->family;
2047                 t->aalgos = ua->aalgos;
2048                 t->ealgos = ua->ealgos;
2049                 t->calgos = ua->calgos;
2050                 err = km_query(x, t, xp);
2051 
2052         }
2053 
2054         kfree(x);
2055         kfree(xp);
2056 
2057         return 0;
2058 
2059 bad_policy:
2060         WARN(1, "BAD policy passed\n");
2061 free_state:
2062         kfree(x);
2063 nomem:
2064         return err;
2065 }
2066 
2067 #ifdef CONFIG_XFRM_MIGRATE
2068 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2069                                   struct xfrm_kmaddress *k,
2070                                   struct nlattr **attrs, int *num)
2071 {
2072         struct nlattr *rt = attrs[XFRMA_MIGRATE];
2073         struct xfrm_user_migrate *um;
2074         int i, num_migrate;
2075 
2076         if (k != NULL) {
2077                 struct xfrm_user_kmaddress *uk;
2078 
2079                 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2080                 memcpy(&k->local, &uk->local, sizeof(k->local));
2081                 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2082                 k->family = uk->family;
2083                 k->reserved = uk->reserved;
2084         }
2085 
2086         um = nla_data(rt);
2087         num_migrate = nla_len(rt) / sizeof(*um);
2088 
2089         if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2090                 return -EINVAL;
2091 
2092         for (i = 0; i < num_migrate; i++, um++, ma++) {
2093                 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2094                 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2095                 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2096                 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2097 
2098                 ma->proto = um->proto;
2099                 ma->mode = um->mode;
2100                 ma->reqid = um->reqid;
2101 
2102                 ma->old_family = um->old_family;
2103                 ma->new_family = um->new_family;
2104         }
2105 
2106         *num = i;
2107         return 0;
2108 }
2109 
2110 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2111                            struct nlattr **attrs)
2112 {
2113         struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2114         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2115         struct xfrm_kmaddress km, *kmp;
2116         u8 type;
2117         int err;
2118         int n = 0;
2119 
2120         if (attrs[XFRMA_MIGRATE] == NULL)
2121                 return -EINVAL;
2122 
2123         kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2124 
2125         err = copy_from_user_policy_type(&type, attrs);
2126         if (err)
2127                 return err;
2128 
2129         err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2130         if (err)
2131                 return err;
2132 
2133         if (!n)
2134                 return 0;
2135 
2136         xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2137 
2138         return 0;
2139 }
2140 #else
2141 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2142                            struct nlattr **attrs)
2143 {
2144         return -ENOPROTOOPT;
2145 }
2146 #endif
2147 
2148 #ifdef CONFIG_XFRM_MIGRATE
2149 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2150 {
2151         struct xfrm_user_migrate um;
2152 
2153         memset(&um, 0, sizeof(um));
2154         um.proto = m->proto;
2155         um.mode = m->mode;
2156         um.reqid = m->reqid;
2157         um.old_family = m->old_family;
2158         memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2159         memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2160         um.new_family = m->new_family;
2161         memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2162         memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2163 
2164         return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2165 }
2166 
2167 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2168 {
2169         struct xfrm_user_kmaddress uk;
2170 
2171         memset(&uk, 0, sizeof(uk));
2172         uk.family = k->family;
2173         uk.reserved = k->reserved;
2174         memcpy(&uk.local, &k->local, sizeof(uk.local));
2175         memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2176 
2177         return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2178 }
2179 
2180 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2181 {
2182         return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2183               + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2184               + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2185               + userpolicy_type_attrsize();
2186 }
2187 
2188 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2189                          int num_migrate, const struct xfrm_kmaddress *k,
2190                          const struct xfrm_selector *sel, u8 dir, u8 type)
2191 {
2192         const struct xfrm_migrate *mp;
2193         struct xfrm_userpolicy_id *pol_id;
2194         struct nlmsghdr *nlh;
2195         int i, err;
2196 
2197         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2198         if (nlh == NULL)
2199                 return -EMSGSIZE;
2200 
2201         pol_id = nlmsg_data(nlh);
2202         /* copy data from selector, dir, and type to the pol_id */
2203         memset(pol_id, 0, sizeof(*pol_id));
2204         memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2205         pol_id->dir = dir;
2206 
2207         if (k != NULL) {
2208                 err = copy_to_user_kmaddress(k, skb);
2209                 if (err)
2210                         goto out_cancel;
2211         }
2212         err = copy_to_user_policy_type(type, skb);
2213         if (err)
2214                 goto out_cancel;
2215         for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2216                 err = copy_to_user_migrate(mp, skb);
2217                 if (err)
2218                         goto out_cancel;
2219         }
2220 
2221         return nlmsg_end(skb, nlh);
2222 
2223 out_cancel:
2224         nlmsg_cancel(skb, nlh);
2225         return err;
2226 }
2227 
2228 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2229                              const struct xfrm_migrate *m, int num_migrate,
2230                              const struct xfrm_kmaddress *k)
2231 {
2232         struct net *net = &init_net;
2233         struct sk_buff *skb;
2234 
2235         skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2236         if (skb == NULL)
2237                 return -ENOMEM;
2238 
2239         /* build migrate */
2240         if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2241                 BUG();
2242 
2243         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2244 }
2245 #else
2246 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2247                              const struct xfrm_migrate *m, int num_migrate,
2248                              const struct xfrm_kmaddress *k)
2249 {
2250         return -ENOPROTOOPT;
2251 }
2252 #endif
2253 
2254 #define XMSGSIZE(type) sizeof(struct type)
2255 
2256 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2257         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2258         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2259         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2260         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2261         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2262         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2263         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2264         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2265         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2266         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2267         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2268         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2269         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2270         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2271         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2272         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2273         [XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2274         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2275         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2276         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2277 };
2278 
2279 #undef XMSGSIZE
2280 
2281 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2282         [XFRMA_SA]              = { .len = sizeof(struct xfrm_usersa_info)},
2283         [XFRMA_POLICY]          = { .len = sizeof(struct xfrm_userpolicy_info)},
2284         [XFRMA_LASTUSED]        = { .type = NLA_U64},
2285         [XFRMA_ALG_AUTH_TRUNC]  = { .len = sizeof(struct xfrm_algo_auth)},
2286         [XFRMA_ALG_AEAD]        = { .len = sizeof(struct xfrm_algo_aead) },
2287         [XFRMA_ALG_AUTH]        = { .len = sizeof(struct xfrm_algo) },
2288         [XFRMA_ALG_CRYPT]       = { .len = sizeof(struct xfrm_algo) },
2289         [XFRMA_ALG_COMP]        = { .len = sizeof(struct xfrm_algo) },
2290         [XFRMA_ENCAP]           = { .len = sizeof(struct xfrm_encap_tmpl) },
2291         [XFRMA_TMPL]            = { .len = sizeof(struct xfrm_user_tmpl) },
2292         [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_sec_ctx) },
2293         [XFRMA_LTIME_VAL]       = { .len = sizeof(struct xfrm_lifetime_cur) },
2294         [XFRMA_REPLAY_VAL]      = { .len = sizeof(struct xfrm_replay_state) },
2295         [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },
2296         [XFRMA_ETIMER_THRESH]   = { .type = NLA_U32 },
2297         [XFRMA_SRCADDR]         = { .len = sizeof(xfrm_address_t) },
2298         [XFRMA_COADDR]          = { .len = sizeof(xfrm_address_t) },
2299         [XFRMA_POLICY_TYPE]     = { .len = sizeof(struct xfrm_userpolicy_type)},
2300         [XFRMA_MIGRATE]         = { .len = sizeof(struct xfrm_user_migrate) },
2301         [XFRMA_KMADDRESS]       = { .len = sizeof(struct xfrm_user_kmaddress) },
2302         [XFRMA_MARK]            = { .len = sizeof(struct xfrm_mark) },
2303         [XFRMA_TFCPAD]          = { .type = NLA_U32 },
2304         [XFRMA_REPLAY_ESN_VAL]  = { .len = sizeof(struct xfrm_replay_state_esn) },
2305 };
2306 
2307 static struct xfrm_link {
2308         int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2309         int (*dump)(struct sk_buff *, struct netlink_callback *);
2310         int (*done)(struct netlink_callback *);
2311 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2312         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2313         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2314         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2315                                                    .dump = xfrm_dump_sa,
2316                                                    .done = xfrm_dump_sa_done  },
2317         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2318         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2319         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2320                                                    .dump = xfrm_dump_policy,
2321                                                    .done = xfrm_dump_policy_done },
2322         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2323         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2324         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2325         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2326         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2327         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2328         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2329         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2330         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2331         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2332         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2333         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2334         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2335 };
2336 
2337 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2338 {
2339         struct net *net = sock_net(skb->sk);
2340         struct nlattr *attrs[XFRMA_MAX+1];
2341         struct xfrm_link *link;
2342         int type, err;
2343 
2344         type = nlh->nlmsg_type;
2345         if (type > XFRM_MSG_MAX)
2346                 return -EINVAL;
2347 
2348         type -= XFRM_MSG_BASE;
2349         link = &xfrm_dispatch[type];
2350 
2351         /* All operations require privileges, even GET */
2352         if (!capable(CAP_NET_ADMIN))
2353                 return -EPERM;
2354 
2355         if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2356              type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2357             (nlh->nlmsg_flags & NLM_F_DUMP)) {
2358                 if (link->dump == NULL)
2359                         return -EINVAL;
2360 
2361                 {
2362                         struct netlink_dump_control c = {
2363                                 .dump = link->dump,
2364                                 .done = link->done,
2365                         };
2366                         return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2367                 }
2368         }
2369 
2370         err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2371                           xfrma_policy);
2372         if (err < 0)
2373                 return err;
2374 
2375         if (link->doit == NULL)
2376                 return -EINVAL;
2377 
2378         return link->doit(skb, nlh, attrs);
2379 }
2380 
2381 static void xfrm_netlink_rcv(struct sk_buff *skb)
2382 {
2383         mutex_lock(&xfrm_cfg_mutex);
2384         netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2385         mutex_unlock(&xfrm_cfg_mutex);
2386 }
2387 
2388 static inline size_t xfrm_expire_msgsize(void)
2389 {
2390         return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2391                + nla_total_size(sizeof(struct xfrm_mark));
2392 }
2393 
2394 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2395 {
2396         struct xfrm_user_expire *ue;
2397         struct nlmsghdr *nlh;
2398         int err;
2399 
2400         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2401         if (nlh == NULL)
2402                 return -EMSGSIZE;
2403 
2404         ue = nlmsg_data(nlh);
2405         copy_to_user_state(x, &ue->state);
2406         ue->hard = (c->data.hard != 0) ? 1 : 0;
2407 
2408         err = xfrm_mark_put(skb, &x->mark);
2409         if (err)
2410                 return err;
2411 
2412         return nlmsg_end(skb, nlh);
2413 }
2414 
2415 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2416 {
2417         struct net *net = xs_net(x);
2418         struct sk_buff *skb;
2419 
2420         skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2421         if (skb == NULL)
2422                 return -ENOMEM;
2423 
2424         if (build_expire(skb, x, c) < 0) {
2425                 kfree_skb(skb);
2426                 return -EMSGSIZE;
2427         }
2428 
2429         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2430 }
2431 
2432 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2433 {
2434         struct net *net = xs_net(x);
2435         struct sk_buff *skb;
2436 
2437         skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2438         if (skb == NULL)
2439                 return -ENOMEM;
2440 
2441         if (build_aevent(skb, x, c) < 0)
2442                 BUG();
2443 
2444         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2445 }
2446 
2447 static int xfrm_notify_sa_flush(const struct km_event *c)
2448 {
2449         struct net *net = c->net;
2450         struct xfrm_usersa_flush *p;
2451         struct nlmsghdr *nlh;
2452         struct sk_buff *skb;
2453         int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2454 
2455         skb = nlmsg_new(len, GFP_ATOMIC);
2456         if (skb == NULL)
2457                 return -ENOMEM;
2458 
2459         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2460         if (nlh == NULL) {
2461                 kfree_skb(skb);
2462                 return -EMSGSIZE;
2463         }
2464 
2465         p = nlmsg_data(nlh);
2466         p->proto = c->data.proto;
2467 
2468         nlmsg_end(skb, nlh);
2469 
2470         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2471 }
2472 
2473 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2474 {
2475         size_t l = 0;
2476         if (x->aead)
2477                 l += nla_total_size(aead_len(x->aead));
2478         if (x->aalg) {
2479                 l += nla_total_size(sizeof(struct xfrm_algo) +
2480                                     (x->aalg->alg_key_len + 7) / 8);
2481                 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2482         }
2483         if (x->ealg)
2484                 l += nla_total_size(xfrm_alg_len(x->ealg));
2485         if (x->calg)
2486                 l += nla_total_size(sizeof(*x->calg));
2487         if (x->encap)
2488                 l += nla_total_size(sizeof(*x->encap));
2489         if (x->tfcpad)
2490                 l += nla_total_size(sizeof(x->tfcpad));
2491         if (x->replay_esn)
2492                 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2493         if (x->security)
2494                 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2495                                     x->security->ctx_len);
2496         if (x->coaddr)
2497                 l += nla_total_size(sizeof(*x->coaddr));
2498 
2499         /* Must count x->lastused as it may become non-zero behind our back. */
2500         l += nla_total_size(sizeof(u64));
2501 
2502         return l;
2503 }
2504 
2505 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2506 {
2507         struct net *net = xs_net(x);
2508         struct xfrm_usersa_info *p;
2509         struct xfrm_usersa_id *id;
2510         struct nlmsghdr *nlh;
2511         struct sk_buff *skb;
2512         int len = xfrm_sa_len(x);
2513         int headlen, err;
2514 
2515         headlen = sizeof(*p);
2516         if (c->event == XFRM_MSG_DELSA) {
2517                 len += nla_total_size(headlen);
2518                 headlen = sizeof(*id);
2519                 len += nla_total_size(sizeof(struct xfrm_mark));
2520         }
2521         len += NLMSG_ALIGN(headlen);
2522 
2523         skb = nlmsg_new(len, GFP_ATOMIC);
2524         if (skb == NULL)
2525                 return -ENOMEM;
2526 
2527         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2528         err = -EMSGSIZE;
2529         if (nlh == NULL)
2530                 goto out_free_skb;
2531 
2532         p = nlmsg_data(nlh);
2533         if (c->event == XFRM_MSG_DELSA) {
2534                 struct nlattr *attr;
2535 
2536                 id = nlmsg_data(nlh);
2537                 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2538                 id->spi = x->id.spi;
2539                 id->family = x->props.family;
2540                 id->proto = x->id.proto;
2541 
2542                 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2543                 err = -EMSGSIZE;
2544                 if (attr == NULL)
2545                         goto out_free_skb;
2546 
2547                 p = nla_data(attr);
2548         }
2549         err = copy_to_user_state_extra(x, p, skb);
2550         if (err)
2551                 goto out_free_skb;
2552 
2553         nlmsg_end(skb, nlh);
2554 
2555         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2556 
2557 out_free_skb:
2558         kfree_skb(skb);
2559         return err;
2560 }
2561 
2562 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2563 {
2564 
2565         switch (c->event) {
2566         case XFRM_MSG_EXPIRE:
2567                 return xfrm_exp_state_notify(x, c);
2568         case XFRM_MSG_NEWAE:
2569                 return xfrm_aevent_state_notify(x, c);
2570         case XFRM_MSG_DELSA:
2571         case XFRM_MSG_UPDSA:
2572         case XFRM_MSG_NEWSA:
2573                 return xfrm_notify_sa(x, c);
2574         case XFRM_MSG_FLUSHSA:
2575                 return xfrm_notify_sa_flush(c);
2576         default:
2577                 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2578                        c->event);
2579                 break;
2580         }
2581 
2582         return 0;
2583 
2584 }
2585 
2586 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2587                                           struct xfrm_policy *xp)
2588 {
2589         return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2590                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2591                + nla_total_size(sizeof(struct xfrm_mark))
2592                + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2593                + userpolicy_type_attrsize();
2594 }
2595 
2596 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2597                          struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2598 {
2599         __u32 seq = xfrm_get_acqseq();
2600         struct xfrm_user_acquire *ua;
2601         struct nlmsghdr *nlh;
2602         int err;
2603 
2604         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2605         if (nlh == NULL)
2606                 return -EMSGSIZE;
2607 
2608         ua = nlmsg_data(nlh);
2609         memcpy(&ua->id, &x->id, sizeof(ua->id));
2610         memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2611         memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2612         copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2613         ua->aalgos = xt->aalgos;
2614         ua->ealgos = xt->ealgos;
2615         ua->calgos = xt->calgos;
2616         ua->seq = x->km.seq = seq;
2617 
2618         err = copy_to_user_tmpl(xp, skb);
2619         if (!err)
2620                 err = copy_to_user_state_sec_ctx(x, skb);
2621         if (!err)
2622                 err = copy_to_user_policy_type(xp->type, skb);
2623         if (!err)
2624                 err = xfrm_mark_put(skb, &xp->mark);
2625         if (err) {
2626                 nlmsg_cancel(skb, nlh);
2627                 return err;
2628         }
2629 
2630         return nlmsg_end(skb, nlh);
2631 }
2632 
2633 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2634                              struct xfrm_policy *xp)
2635 {
2636         struct net *net = xs_net(x);
2637         struct sk_buff *skb;
2638 
2639         skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2640         if (skb == NULL)
2641                 return -ENOMEM;
2642 
2643         if (build_acquire(skb, x, xt, xp) < 0)
2644                 BUG();
2645 
2646         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2647 }
2648 
2649 /* User gives us xfrm_user_policy_info followed by an array of 0
2650  * or more templates.
2651  */
2652 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2653                                                u8 *data, int len, int *dir)
2654 {
2655         struct net *net = sock_net(sk);
2656         struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2657         struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2658         struct xfrm_policy *xp;
2659         int nr;
2660 
2661         switch (sk->sk_family) {
2662         case AF_INET:
2663                 if (opt != IP_XFRM_POLICY) {
2664                         *dir = -EOPNOTSUPP;
2665                         return NULL;
2666                 }
2667                 break;
2668 #if IS_ENABLED(CONFIG_IPV6)
2669         case AF_INET6:
2670                 if (opt != IPV6_XFRM_POLICY) {
2671                         *dir = -EOPNOTSUPP;
2672                         return NULL;
2673                 }
2674                 break;
2675 #endif
2676         default:
2677                 *dir = -EINVAL;
2678                 return NULL;
2679         }
2680 
2681         *dir = -EINVAL;
2682 
2683         if (len < sizeof(*p) ||
2684             verify_newpolicy_info(p))
2685                 return NULL;
2686 
2687         nr = ((len - sizeof(*p)) / sizeof(*ut));
2688         if (validate_tmpl(nr, ut, p->sel.family))
2689                 return NULL;
2690 
2691         if (p->dir > XFRM_POLICY_OUT)
2692                 return NULL;
2693 
2694         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2695         if (xp == NULL) {
2696                 *dir = -ENOBUFS;
2697                 return NULL;
2698         }
2699 
2700         copy_from_user_policy(xp, p);
2701         xp->type = XFRM_POLICY_TYPE_MAIN;
2702         copy_templates(xp, ut, nr);
2703 
2704         *dir = p->dir;
2705 
2706         return xp;
2707 }
2708 
2709 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2710 {
2711         return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2712                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2713                + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2714                + nla_total_size(sizeof(struct xfrm_mark))
2715                + userpolicy_type_attrsize();
2716 }
2717 
2718 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2719                            int dir, const struct km_event *c)
2720 {
2721         struct xfrm_user_polexpire *upe;
2722         int hard = c->data.hard;
2723         struct nlmsghdr *nlh;
2724         int err;
2725 
2726         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2727         if (nlh == NULL)
2728                 return -EMSGSIZE;
2729 
2730         upe = nlmsg_data(nlh);
2731         copy_to_user_policy(xp, &upe->pol, dir);
2732         err = copy_to_user_tmpl(xp, skb);
2733         if (!err)
2734                 err = copy_to_user_sec_ctx(xp, skb);
2735         if (!err)
2736                 err = copy_to_user_policy_type(xp->type, skb);
2737         if (!err)
2738                 err = xfrm_mark_put(skb, &xp->mark);
2739         if (err) {
2740                 nlmsg_cancel(skb, nlh);
2741                 return err;
2742         }
2743         upe->hard = !!hard;
2744 
2745         return nlmsg_end(skb, nlh);
2746 }
2747 
2748 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2749 {
2750         struct net *net = xp_net(xp);
2751         struct sk_buff *skb;
2752 
2753         skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2754         if (skb == NULL)
2755                 return -ENOMEM;
2756 
2757         if (build_polexpire(skb, xp, dir, c) < 0)
2758                 BUG();
2759 
2760         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2761 }
2762 
2763 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2764 {
2765         int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2766         struct net *net = xp_net(xp);
2767         struct xfrm_userpolicy_info *p;
2768         struct xfrm_userpolicy_id *id;
2769         struct nlmsghdr *nlh;
2770         struct sk_buff *skb;
2771         int headlen, err;
2772 
2773         headlen = sizeof(*p);
2774         if (c->event == XFRM_MSG_DELPOLICY) {
2775                 len += nla_total_size(headlen);
2776                 headlen = sizeof(*id);
2777         }
2778         len += userpolicy_type_attrsize();
2779         len += nla_total_size(sizeof(struct xfrm_mark));
2780         len += NLMSG_ALIGN(headlen);
2781 
2782         skb = nlmsg_new(len, GFP_ATOMIC);
2783         if (skb == NULL)
2784                 return -ENOMEM;
2785 
2786         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2787         err = -EMSGSIZE;
2788         if (nlh == NULL)
2789                 goto out_free_skb;
2790 
2791         p = nlmsg_data(nlh);
2792         if (c->event == XFRM_MSG_DELPOLICY) {
2793                 struct nlattr *attr;
2794 
2795                 id = nlmsg_data(nlh);
2796                 memset(id, 0, sizeof(*id));
2797                 id->dir = dir;
2798                 if (c->data.byid)
2799                         id->index = xp->index;
2800                 else
2801                         memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2802 
2803                 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2804                 err = -EMSGSIZE;
2805                 if (attr == NULL)
2806                         goto out_free_skb;
2807 
2808                 p = nla_data(attr);
2809         }
2810 
2811         copy_to_user_policy(xp, p, dir);
2812         err = copy_to_user_tmpl(xp, skb);
2813         if (!err)
2814                 err = copy_to_user_policy_type(xp->type, skb);
2815         if (!err)
2816                 err = xfrm_mark_put(skb, &xp->mark);
2817         if (err)
2818                 goto out_free_skb;
2819 
2820         nlmsg_end(skb, nlh);
2821 
2822         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2823 
2824 out_free_skb:
2825         kfree_skb(skb);
2826         return err;
2827 }
2828 
2829 static int xfrm_notify_policy_flush(const struct km_event *c)
2830 {
2831         struct net *net = c->net;
2832         struct nlmsghdr *nlh;
2833         struct sk_buff *skb;
2834         int err;
2835 
2836         skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2837         if (skb == NULL)
2838                 return -ENOMEM;
2839 
2840         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2841         err = -EMSGSIZE;
2842         if (nlh == NULL)
2843                 goto out_free_skb;
2844         err = copy_to_user_policy_type(c->data.type, skb);
2845         if (err)
2846                 goto out_free_skb;
2847 
2848         nlmsg_end(skb, nlh);
2849 
2850         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2851 
2852 out_free_skb:
2853         kfree_skb(skb);
2854         return err;
2855 }
2856 
2857 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2858 {
2859 
2860         switch (c->event) {
2861         case XFRM_MSG_NEWPOLICY:
2862         case XFRM_MSG_UPDPOLICY:
2863         case XFRM_MSG_DELPOLICY:
2864                 return xfrm_notify_policy(xp, dir, c);
2865         case XFRM_MSG_FLUSHPOLICY:
2866                 return xfrm_notify_policy_flush(c);
2867         case XFRM_MSG_POLEXPIRE:
2868                 return xfrm_exp_policy_notify(xp, dir, c);
2869         default:
2870                 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2871                        c->event);
2872         }
2873 
2874         return 0;
2875 
2876 }
2877 
2878 static inline size_t xfrm_report_msgsize(void)
2879 {
2880         return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2881 }
2882 
2883 static int build_report(struct sk_buff *skb, u8 proto,
2884                         struct xfrm_selector *sel, xfrm_address_t *addr)
2885 {
2886         struct xfrm_user_report *ur;
2887         struct nlmsghdr *nlh;
2888 
2889         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2890         if (nlh == NULL)
2891                 return -EMSGSIZE;
2892 
2893         ur = nlmsg_data(nlh);
2894         ur->proto = proto;
2895         memcpy(&ur->sel, sel, sizeof(ur->sel));
2896 
2897         if (addr) {
2898                 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2899                 if (err) {
2900                         nlmsg_cancel(skb, nlh);
2901                         return err;
2902                 }
2903         }
2904         return nlmsg_end(skb, nlh);
2905 }
2906 
2907 static int xfrm_send_report(struct net *net, u8 proto,
2908                             struct xfrm_selector *sel, xfrm_address_t *addr)
2909 {
2910         struct sk_buff *skb;
2911 
2912         skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2913         if (skb == NULL)
2914                 return -ENOMEM;
2915 
2916         if (build_report(skb, proto, sel, addr) < 0)
2917                 BUG();
2918 
2919         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2920 }
2921 
2922 static inline size_t xfrm_mapping_msgsize(void)
2923 {
2924         return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2925 }
2926 
2927 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2928                          xfrm_address_t *new_saddr, __be16 new_sport)
2929 {
2930         struct xfrm_user_mapping *um;
2931         struct nlmsghdr *nlh;
2932 
2933         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2934         if (nlh == NULL)
2935                 return -EMSGSIZE;
2936 
2937         um = nlmsg_data(nlh);
2938 
2939         memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2940         um->id.spi = x->id.spi;
2941         um->id.family = x->props.family;
2942         um->id.proto = x->id.proto;
2943         memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2944         memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2945         um->new_sport = new_sport;
2946         um->old_sport = x->encap->encap_sport;
2947         um->reqid = x->props.reqid;
2948 
2949         return nlmsg_end(skb, nlh);
2950 }
2951 
2952 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2953                              __be16 sport)
2954 {
2955         struct net *net = xs_net(x);
2956         struct sk_buff *skb;
2957 
2958         if (x->id.proto != IPPROTO_ESP)
2959                 return -EINVAL;
2960 
2961         if (!x->encap)
2962                 return -EINVAL;
2963 
2964         skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2965         if (skb == NULL)
2966                 return -ENOMEM;
2967 
2968         if (build_mapping(skb, x, ipaddr, sport) < 0)
2969                 BUG();
2970 
2971         return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2972 }
2973 
2974 static struct xfrm_mgr netlink_mgr = {
2975         .id             = "netlink",
2976         .notify         = xfrm_send_state_notify,
2977         .acquire        = xfrm_send_acquire,
2978         .compile_policy = xfrm_compile_policy,
2979         .notify_policy  = xfrm_send_policy_notify,
2980         .report         = xfrm_send_report,
2981         .migrate        = xfrm_send_migrate,
2982         .new_mapping    = xfrm_send_mapping,
2983 };
2984 
2985 static int __net_init xfrm_user_net_init(struct net *net)
2986 {
2987         struct sock *nlsk;
2988         struct netlink_kernel_cfg cfg = {
2989                 .groups = XFRMNLGRP_MAX,
2990                 .input  = xfrm_netlink_rcv,
2991         };
2992 
2993         nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
2994         if (nlsk == NULL)
2995                 return -ENOMEM;
2996         net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2997         rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2998         return 0;
2999 }
3000 
3001 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3002 {
3003         struct net *net;
3004         list_for_each_entry(net, net_exit_list, exit_list)
3005                 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3006         synchronize_net();
3007         list_for_each_entry(net, net_exit_list, exit_list)
3008                 netlink_kernel_release(net->xfrm.nlsk_stash);
3009 }
3010 
3011 static struct pernet_operations xfrm_user_net_ops = {
3012         .init       = xfrm_user_net_init,
3013         .exit_batch = xfrm_user_net_exit,
3014 };
3015 
3016 static int __init xfrm_user_init(void)
3017 {
3018         int rv;
3019 
3020         printk(KERN_INFO "Initializing XFRM netlink socket\n");
3021 
3022         rv = register_pernet_subsys(&xfrm_user_net_ops);
3023         if (rv < 0)
3024                 return rv;
3025         rv = xfrm_register_km(&netlink_mgr);
3026         if (rv < 0)
3027                 unregister_pernet_subsys(&xfrm_user_net_ops);
3028         return rv;
3029 }
3030 
3031 static void __exit xfrm_user_exit(void)
3032 {
3033         xfrm_unregister_km(&netlink_mgr);
3034         unregister_pernet_subsys(&xfrm_user_net_ops);
3035 }
3036 
3037 module_init(xfrm_user_init);
3038 module_exit(xfrm_user_exit);
3039 MODULE_LICENSE("GPL");
3040 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3041 
3042 

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