Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/net/xfrm/xfrm_user.c

  1 /* xfrm_user.c: User interface to configure xfrm engine.
  2  *
  3  * Copyright (C) 2002 David S. Miller (davem@redhat.com)
  4  *
  5  * Changes:
  6  *      Mitsuru KANDA @USAGI
  7  *      Kazunori MIYAZAWA @USAGI
  8  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  9  *              IPv6 support
 10  *
 11  */
 12 
 13 #include <linux/crypto.h>
 14 #include <linux/module.h>
 15 #include <linux/kernel.h>
 16 #include <linux/types.h>
 17 #include <linux/slab.h>
 18 #include <linux/socket.h>
 19 #include <linux/string.h>
 20 #include <linux/net.h>
 21 #include <linux/skbuff.h>
 22 #include <linux/pfkeyv2.h>
 23 #include <linux/ipsec.h>
 24 #include <linux/init.h>
 25 #include <linux/security.h>
 26 #include <net/sock.h>
 27 #include <net/xfrm.h>
 28 #include <net/netlink.h>
 29 #include <net/ah.h>
 30 #include <asm/uaccess.h>
 31 #if IS_ENABLED(CONFIG_IPV6)
 32 #include <linux/in6.h>
 33 #endif
 34 
 35 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
 36 {
 37         struct nlattr *rt = attrs[type];
 38         struct xfrm_algo *algp;
 39 
 40         if (!rt)
 41                 return 0;
 42 
 43         algp = nla_data(rt);
 44         if (nla_len(rt) < xfrm_alg_len(algp))
 45                 return -EINVAL;
 46 
 47         switch (type) {
 48         case XFRMA_ALG_AUTH:
 49         case XFRMA_ALG_CRYPT:
 50         case XFRMA_ALG_COMP:
 51                 break;
 52 
 53         default:
 54                 return -EINVAL;
 55         }
 56 
 57         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 58         return 0;
 59 }
 60 
 61 static int verify_auth_trunc(struct nlattr **attrs)
 62 {
 63         struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
 64         struct xfrm_algo_auth *algp;
 65 
 66         if (!rt)
 67                 return 0;
 68 
 69         algp = nla_data(rt);
 70         if (nla_len(rt) < xfrm_alg_auth_len(algp))
 71                 return -EINVAL;
 72 
 73         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 74         return 0;
 75 }
 76 
 77 static int verify_aead(struct nlattr **attrs)
 78 {
 79         struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
 80         struct xfrm_algo_aead *algp;
 81 
 82         if (!rt)
 83                 return 0;
 84 
 85         algp = nla_data(rt);
 86         if (nla_len(rt) < aead_len(algp))
 87                 return -EINVAL;
 88 
 89         algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
 90         return 0;
 91 }
 92 
 93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
 94                            xfrm_address_t **addrp)
 95 {
 96         struct nlattr *rt = attrs[type];
 97 
 98         if (rt && addrp)
 99                 *addrp = nla_data(rt);
100 }
101 
102 static inline int verify_sec_ctx_len(struct nlattr **attrs)
103 {
104         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
105         struct xfrm_user_sec_ctx *uctx;
106 
107         if (!rt)
108                 return 0;
109 
110         uctx = nla_data(rt);
111         if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
112                 return -EINVAL;
113 
114         return 0;
115 }
116 
117 static inline int verify_replay(struct xfrm_usersa_info *p,
118                                 struct nlattr **attrs)
119 {
120         struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
121         struct xfrm_replay_state_esn *rs;
122 
123         if (p->flags & XFRM_STATE_ESN) {
124                 if (!rt)
125                         return -EINVAL;
126 
127                 rs = nla_data(rt);
128 
129                 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
130                         return -EINVAL;
131 
132                 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133                     nla_len(rt) != sizeof(*rs))
134                         return -EINVAL;
135         }
136 
137         if (!rt)
138                 return 0;
139 
140         /* As only ESP and AH support ESN feature. */
141         if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
142                 return -EINVAL;
143 
144         if (p->replay_window != 0)
145                 return -EINVAL;
146 
147         return 0;
148 }
149 
150 static int verify_newsa_info(struct xfrm_usersa_info *p,
151                              struct nlattr **attrs)
152 {
153         int err;
154 
155         err = -EINVAL;
156         switch (p->family) {
157         case AF_INET:
158                 break;
159 
160         case AF_INET6:
161 #if IS_ENABLED(CONFIG_IPV6)
162                 break;
163 #else
164                 err = -EAFNOSUPPORT;
165                 goto out;
166 #endif
167 
168         default:
169                 goto out;
170         }
171 
172         err = -EINVAL;
173         switch (p->id.proto) {
174         case IPPROTO_AH:
175                 if ((!attrs[XFRMA_ALG_AUTH]     &&
176                      !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
177                     attrs[XFRMA_ALG_AEAD]       ||
178                     attrs[XFRMA_ALG_CRYPT]      ||
179                     attrs[XFRMA_ALG_COMP]       ||
180                     attrs[XFRMA_TFCPAD])
181                         goto out;
182                 break;
183 
184         case IPPROTO_ESP:
185                 if (attrs[XFRMA_ALG_COMP])
186                         goto out;
187                 if (!attrs[XFRMA_ALG_AUTH] &&
188                     !attrs[XFRMA_ALG_AUTH_TRUNC] &&
189                     !attrs[XFRMA_ALG_CRYPT] &&
190                     !attrs[XFRMA_ALG_AEAD])
191                         goto out;
192                 if ((attrs[XFRMA_ALG_AUTH] ||
193                      attrs[XFRMA_ALG_AUTH_TRUNC] ||
194                      attrs[XFRMA_ALG_CRYPT]) &&
195                     attrs[XFRMA_ALG_AEAD])
196                         goto out;
197                 if (attrs[XFRMA_TFCPAD] &&
198                     p->mode != XFRM_MODE_TUNNEL)
199                         goto out;
200                 break;
201 
202         case IPPROTO_COMP:
203                 if (!attrs[XFRMA_ALG_COMP]      ||
204                     attrs[XFRMA_ALG_AEAD]       ||
205                     attrs[XFRMA_ALG_AUTH]       ||
206                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
207                     attrs[XFRMA_ALG_CRYPT]      ||
208                     attrs[XFRMA_TFCPAD]         ||
209                     (ntohl(p->id.spi) >= 0x10000))
210                         goto out;
211                 break;
212 
213 #if IS_ENABLED(CONFIG_IPV6)
214         case IPPROTO_DSTOPTS:
215         case IPPROTO_ROUTING:
216                 if (attrs[XFRMA_ALG_COMP]       ||
217                     attrs[XFRMA_ALG_AUTH]       ||
218                     attrs[XFRMA_ALG_AUTH_TRUNC] ||
219                     attrs[XFRMA_ALG_AEAD]       ||
220                     attrs[XFRMA_ALG_CRYPT]      ||
221                     attrs[XFRMA_ENCAP]          ||
222                     attrs[XFRMA_SEC_CTX]        ||
223                     attrs[XFRMA_TFCPAD]         ||
224                     !attrs[XFRMA_COADDR])
225                         goto out;
226                 break;
227 #endif
228 
229         default:
230                 goto out;
231         }
232 
233         if ((err = verify_aead(attrs)))
234                 goto out;
235         if ((err = verify_auth_trunc(attrs)))
236                 goto out;
237         if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
238                 goto out;
239         if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
240                 goto out;
241         if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
242                 goto out;
243         if ((err = verify_sec_ctx_len(attrs)))
244                 goto out;
245         if ((err = verify_replay(p, attrs)))
246                 goto out;
247 
248         err = -EINVAL;
249         switch (p->mode) {
250         case XFRM_MODE_TRANSPORT:
251         case XFRM_MODE_TUNNEL:
252         case XFRM_MODE_ROUTEOPTIMIZATION:
253         case XFRM_MODE_BEET:
254                 break;
255 
256         default:
257                 goto out;
258         }
259 
260         err = 0;
261 
262 out:
263         return err;
264 }
265 
266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
267                            struct xfrm_algo_desc *(*get_byname)(const char *, int),
268                            struct nlattr *rta)
269 {
270         struct xfrm_algo *p, *ualg;
271         struct xfrm_algo_desc *algo;
272 
273         if (!rta)
274                 return 0;
275 
276         ualg = nla_data(rta);
277 
278         algo = get_byname(ualg->alg_name, 1);
279         if (!algo)
280                 return -ENOSYS;
281         *props = algo->desc.sadb_alg_id;
282 
283         p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
284         if (!p)
285                 return -ENOMEM;
286 
287         strcpy(p->alg_name, algo->name);
288         *algpp = p;
289         return 0;
290 }
291 
292 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
293                        struct nlattr *rta)
294 {
295         struct xfrm_algo *ualg;
296         struct xfrm_algo_auth *p;
297         struct xfrm_algo_desc *algo;
298 
299         if (!rta)
300                 return 0;
301 
302         ualg = nla_data(rta);
303 
304         algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
305         if (!algo)
306                 return -ENOSYS;
307         *props = algo->desc.sadb_alg_id;
308 
309         p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
310         if (!p)
311                 return -ENOMEM;
312 
313         strcpy(p->alg_name, algo->name);
314         p->alg_key_len = ualg->alg_key_len;
315         p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
316         memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
317 
318         *algpp = p;
319         return 0;
320 }
321 
322 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
323                              struct nlattr *rta)
324 {
325         struct xfrm_algo_auth *p, *ualg;
326         struct xfrm_algo_desc *algo;
327 
328         if (!rta)
329                 return 0;
330 
331         ualg = nla_data(rta);
332 
333         algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
334         if (!algo)
335                 return -ENOSYS;
336         if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
337             ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
338                 return -EINVAL;
339         *props = algo->desc.sadb_alg_id;
340 
341         p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
342         if (!p)
343                 return -ENOMEM;
344 
345         strcpy(p->alg_name, algo->name);
346         if (!p->alg_trunc_len)
347                 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
348 
349         *algpp = p;
350         return 0;
351 }
352 
353 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
354                        struct nlattr *rta)
355 {
356         struct xfrm_algo_aead *p, *ualg;
357         struct xfrm_algo_desc *algo;
358 
359         if (!rta)
360                 return 0;
361 
362         ualg = nla_data(rta);
363 
364         algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
365         if (!algo)
366                 return -ENOSYS;
367         *props = algo->desc.sadb_alg_id;
368 
369         p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
370         if (!p)
371                 return -ENOMEM;
372 
373         strcpy(p->alg_name, algo->name);
374         *algpp = p;
375         return 0;
376 }
377 
378 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
379                                          struct nlattr *rp)
380 {
381         struct xfrm_replay_state_esn *up;
382         int ulen;
383 
384         if (!replay_esn || !rp)
385                 return 0;
386 
387         up = nla_data(rp);
388         ulen = xfrm_replay_state_esn_len(up);
389 
390         if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
391                 return -EINVAL;
392 
393         return 0;
394 }
395 
396 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
397                                        struct xfrm_replay_state_esn **preplay_esn,
398                                        struct nlattr *rta)
399 {
400         struct xfrm_replay_state_esn *p, *pp, *up;
401         int klen, ulen;
402 
403         if (!rta)
404                 return 0;
405 
406         up = nla_data(rta);
407         klen = xfrm_replay_state_esn_len(up);
408         ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
409 
410         p = kzalloc(klen, GFP_KERNEL);
411         if (!p)
412                 return -ENOMEM;
413 
414         pp = kzalloc(klen, GFP_KERNEL);
415         if (!pp) {
416                 kfree(p);
417                 return -ENOMEM;
418         }
419 
420         memcpy(p, up, ulen);
421         memcpy(pp, up, ulen);
422 
423         *replay_esn = p;
424         *preplay_esn = pp;
425 
426         return 0;
427 }
428 
429 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
430 {
431         int len = 0;
432 
433         if (xfrm_ctx) {
434                 len += sizeof(struct xfrm_user_sec_ctx);
435                 len += xfrm_ctx->ctx_len;
436         }
437         return len;
438 }
439 
440 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
441 {
442         memcpy(&x->id, &p->id, sizeof(x->id));
443         memcpy(&x->sel, &p->sel, sizeof(x->sel));
444         memcpy(&x->lft, &p->lft, sizeof(x->lft));
445         x->props.mode = p->mode;
446         x->props.replay_window = min_t(unsigned int, p->replay_window,
447                                         sizeof(x->replay.bitmap) * 8);
448         x->props.reqid = p->reqid;
449         x->props.family = p->family;
450         memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
451         x->props.flags = p->flags;
452 
453         if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
454                 x->sel.family = p->family;
455 }
456 
457 /*
458  * someday when pfkey also has support, we could have the code
459  * somehow made shareable and move it to xfrm_state.c - JHS
460  *
461 */
462 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
463                                   int update_esn)
464 {
465         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
466         struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
467         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
468         struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
469         struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
470 
471         if (re) {
472                 struct xfrm_replay_state_esn *replay_esn;
473                 replay_esn = nla_data(re);
474                 memcpy(x->replay_esn, replay_esn,
475                        xfrm_replay_state_esn_len(replay_esn));
476                 memcpy(x->preplay_esn, replay_esn,
477                        xfrm_replay_state_esn_len(replay_esn));
478         }
479 
480         if (rp) {
481                 struct xfrm_replay_state *replay;
482                 replay = nla_data(rp);
483                 memcpy(&x->replay, replay, sizeof(*replay));
484                 memcpy(&x->preplay, replay, sizeof(*replay));
485         }
486 
487         if (lt) {
488                 struct xfrm_lifetime_cur *ltime;
489                 ltime = nla_data(lt);
490                 x->curlft.bytes = ltime->bytes;
491                 x->curlft.packets = ltime->packets;
492                 x->curlft.add_time = ltime->add_time;
493                 x->curlft.use_time = ltime->use_time;
494         }
495 
496         if (et)
497                 x->replay_maxage = nla_get_u32(et);
498 
499         if (rt)
500                 x->replay_maxdiff = nla_get_u32(rt);
501 }
502 
503 static struct xfrm_state *xfrm_state_construct(struct net *net,
504                                                struct xfrm_usersa_info *p,
505                                                struct nlattr **attrs,
506                                                int *errp)
507 {
508         struct xfrm_state *x = xfrm_state_alloc(net);
509         int err = -ENOMEM;
510 
511         if (!x)
512                 goto error_no_put;
513 
514         copy_from_user_state(x, p);
515 
516         if (attrs[XFRMA_SA_EXTRA_FLAGS])
517                 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
518 
519         if ((err = attach_aead(&x->aead, &x->props.ealgo,
520                                attrs[XFRMA_ALG_AEAD])))
521                 goto error;
522         if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
523                                      attrs[XFRMA_ALG_AUTH_TRUNC])))
524                 goto error;
525         if (!x->props.aalgo) {
526                 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
527                                        attrs[XFRMA_ALG_AUTH])))
528                         goto error;
529         }
530         if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
531                                    xfrm_ealg_get_byname,
532                                    attrs[XFRMA_ALG_CRYPT])))
533                 goto error;
534         if ((err = attach_one_algo(&x->calg, &x->props.calgo,
535                                    xfrm_calg_get_byname,
536                                    attrs[XFRMA_ALG_COMP])))
537                 goto error;
538 
539         if (attrs[XFRMA_ENCAP]) {
540                 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
541                                    sizeof(*x->encap), GFP_KERNEL);
542                 if (x->encap == NULL)
543                         goto error;
544         }
545 
546         if (attrs[XFRMA_TFCPAD])
547                 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
548 
549         if (attrs[XFRMA_COADDR]) {
550                 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
551                                     sizeof(*x->coaddr), GFP_KERNEL);
552                 if (x->coaddr == NULL)
553                         goto error;
554         }
555 
556         xfrm_mark_get(attrs, &x->mark);
557 
558         err = __xfrm_init_state(x, false);
559         if (err)
560                 goto error;
561 
562         if (attrs[XFRMA_SEC_CTX] &&
563             security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
564                 goto error;
565 
566         if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
567                                                attrs[XFRMA_REPLAY_ESN_VAL])))
568                 goto error;
569 
570         x->km.seq = p->seq;
571         x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
572         /* sysctl_xfrm_aevent_etime is in 100ms units */
573         x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
574 
575         if ((err = xfrm_init_replay(x)))
576                 goto error;
577 
578         /* override default values from above */
579         xfrm_update_ae_params(x, attrs, 0);
580 
581         return x;
582 
583 error:
584         x->km.state = XFRM_STATE_DEAD;
585         xfrm_state_put(x);
586 error_no_put:
587         *errp = err;
588         return NULL;
589 }
590 
591 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
592                 struct nlattr **attrs)
593 {
594         struct net *net = sock_net(skb->sk);
595         struct xfrm_usersa_info *p = nlmsg_data(nlh);
596         struct xfrm_state *x;
597         int err;
598         struct km_event c;
599 
600         err = verify_newsa_info(p, attrs);
601         if (err)
602                 return err;
603 
604         x = xfrm_state_construct(net, p, attrs, &err);
605         if (!x)
606                 return err;
607 
608         xfrm_state_hold(x);
609         if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
610                 err = xfrm_state_add(x);
611         else
612                 err = xfrm_state_update(x);
613 
614         xfrm_audit_state_add(x, err ? 0 : 1, true);
615 
616         if (err < 0) {
617                 x->km.state = XFRM_STATE_DEAD;
618                 __xfrm_state_put(x);
619                 goto out;
620         }
621 
622         c.seq = nlh->nlmsg_seq;
623         c.portid = nlh->nlmsg_pid;
624         c.event = nlh->nlmsg_type;
625 
626         km_state_notify(x, &c);
627 out:
628         xfrm_state_put(x);
629         return err;
630 }
631 
632 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
633                                                  struct xfrm_usersa_id *p,
634                                                  struct nlattr **attrs,
635                                                  int *errp)
636 {
637         struct xfrm_state *x = NULL;
638         struct xfrm_mark m;
639         int err;
640         u32 mark = xfrm_mark_get(attrs, &m);
641 
642         if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
643                 err = -ESRCH;
644                 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
645         } else {
646                 xfrm_address_t *saddr = NULL;
647 
648                 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
649                 if (!saddr) {
650                         err = -EINVAL;
651                         goto out;
652                 }
653 
654                 err = -ESRCH;
655                 x = xfrm_state_lookup_byaddr(net, mark,
656                                              &p->daddr, saddr,
657                                              p->proto, p->family);
658         }
659 
660  out:
661         if (!x && errp)
662                 *errp = err;
663         return x;
664 }
665 
666 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
667                 struct nlattr **attrs)
668 {
669         struct net *net = sock_net(skb->sk);
670         struct xfrm_state *x;
671         int err = -ESRCH;
672         struct km_event c;
673         struct xfrm_usersa_id *p = nlmsg_data(nlh);
674 
675         x = xfrm_user_state_lookup(net, p, attrs, &err);
676         if (x == NULL)
677                 return err;
678 
679         if ((err = security_xfrm_state_delete(x)) != 0)
680                 goto out;
681 
682         if (xfrm_state_kern(x)) {
683                 err = -EPERM;
684                 goto out;
685         }
686 
687         err = xfrm_state_delete(x);
688 
689         if (err < 0)
690                 goto out;
691 
692         c.seq = nlh->nlmsg_seq;
693         c.portid = nlh->nlmsg_pid;
694         c.event = nlh->nlmsg_type;
695         km_state_notify(x, &c);
696 
697 out:
698         xfrm_audit_state_delete(x, err ? 0 : 1, true);
699         xfrm_state_put(x);
700         return err;
701 }
702 
703 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
704 {
705         memset(p, 0, sizeof(*p));
706         memcpy(&p->id, &x->id, sizeof(p->id));
707         memcpy(&p->sel, &x->sel, sizeof(p->sel));
708         memcpy(&p->lft, &x->lft, sizeof(p->lft));
709         memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
710         memcpy(&p->stats, &x->stats, sizeof(p->stats));
711         memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
712         p->mode = x->props.mode;
713         p->replay_window = x->props.replay_window;
714         p->reqid = x->props.reqid;
715         p->family = x->props.family;
716         p->flags = x->props.flags;
717         p->seq = x->km.seq;
718 }
719 
720 struct xfrm_dump_info {
721         struct sk_buff *in_skb;
722         struct sk_buff *out_skb;
723         u32 nlmsg_seq;
724         u16 nlmsg_flags;
725 };
726 
727 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
728 {
729         struct xfrm_user_sec_ctx *uctx;
730         struct nlattr *attr;
731         int ctx_size = sizeof(*uctx) + s->ctx_len;
732 
733         attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
734         if (attr == NULL)
735                 return -EMSGSIZE;
736 
737         uctx = nla_data(attr);
738         uctx->exttype = XFRMA_SEC_CTX;
739         uctx->len = ctx_size;
740         uctx->ctx_doi = s->ctx_doi;
741         uctx->ctx_alg = s->ctx_alg;
742         uctx->ctx_len = s->ctx_len;
743         memcpy(uctx + 1, s->ctx_str, s->ctx_len);
744 
745         return 0;
746 }
747 
748 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
749 {
750         struct xfrm_algo *algo;
751         struct nlattr *nla;
752 
753         nla = nla_reserve(skb, XFRMA_ALG_AUTH,
754                           sizeof(*algo) + (auth->alg_key_len + 7) / 8);
755         if (!nla)
756                 return -EMSGSIZE;
757 
758         algo = nla_data(nla);
759         strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
760         memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
761         algo->alg_key_len = auth->alg_key_len;
762 
763         return 0;
764 }
765 
766 /* Don't change this without updating xfrm_sa_len! */
767 static int copy_to_user_state_extra(struct xfrm_state *x,
768                                     struct xfrm_usersa_info *p,
769                                     struct sk_buff *skb)
770 {
771         int ret = 0;
772 
773         copy_to_user_state(x, p);
774 
775         if (x->props.extra_flags) {
776                 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
777                                   x->props.extra_flags);
778                 if (ret)
779                         goto out;
780         }
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         struct sock *sk = cb->skb->sk;
870         struct net *net = sock_net(sk);
871 
872         xfrm_state_walk_done(walk, net);
873         return 0;
874 }
875 
876 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
877 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
878 {
879         struct net *net = sock_net(skb->sk);
880         struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
881         struct xfrm_dump_info info;
882 
883         BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
884                      sizeof(cb->args) - sizeof(cb->args[0]));
885 
886         info.in_skb = cb->skb;
887         info.out_skb = skb;
888         info.nlmsg_seq = cb->nlh->nlmsg_seq;
889         info.nlmsg_flags = NLM_F_MULTI;
890 
891         if (!cb->args[0]) {
892                 struct nlattr *attrs[XFRMA_MAX+1];
893                 struct xfrm_address_filter *filter = NULL;
894                 u8 proto = 0;
895                 int err;
896 
897                 cb->args[0] = 1;
898 
899                 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
900                                   xfrma_policy);
901                 if (err < 0)
902                         return err;
903 
904                 if (attrs[XFRMA_ADDRESS_FILTER]) {
905                         filter = kmalloc(sizeof(*filter), GFP_KERNEL);
906                         if (filter == NULL)
907                                 return -ENOMEM;
908 
909                         memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
910                                sizeof(*filter));
911                 }
912 
913                 if (attrs[XFRMA_PROTO])
914                         proto = nla_get_u8(attrs[XFRMA_PROTO]);
915 
916                 xfrm_state_walk_init(walk, proto, filter);
917         }
918 
919         (void) xfrm_state_walk(net, walk, dump_one_state, &info);
920 
921         return skb->len;
922 }
923 
924 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
925                                           struct xfrm_state *x, u32 seq)
926 {
927         struct xfrm_dump_info info;
928         struct sk_buff *skb;
929         int err;
930 
931         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
932         if (!skb)
933                 return ERR_PTR(-ENOMEM);
934 
935         info.in_skb = in_skb;
936         info.out_skb = skb;
937         info.nlmsg_seq = seq;
938         info.nlmsg_flags = 0;
939 
940         err = dump_one_state(x, 0, &info);
941         if (err) {
942                 kfree_skb(skb);
943                 return ERR_PTR(err);
944         }
945 
946         return skb;
947 }
948 
949 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
950  * Must be called with RCU read lock.
951  */
952 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
953                                        u32 pid, unsigned int group)
954 {
955         struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
956 
957         if (nlsk)
958                 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
959         else
960                 return -1;
961 }
962 
963 static inline size_t xfrm_spdinfo_msgsize(void)
964 {
965         return NLMSG_ALIGN(4)
966                + nla_total_size(sizeof(struct xfrmu_spdinfo))
967                + nla_total_size(sizeof(struct xfrmu_spdhinfo));
968 }
969 
970 static int build_spdinfo(struct sk_buff *skb, struct net *net,
971                          u32 portid, u32 seq, u32 flags)
972 {
973         struct xfrmk_spdinfo si;
974         struct xfrmu_spdinfo spc;
975         struct xfrmu_spdhinfo sph;
976         struct nlmsghdr *nlh;
977         int err;
978         u32 *f;
979 
980         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
981         if (nlh == NULL) /* shouldn't really happen ... */
982                 return -EMSGSIZE;
983 
984         f = nlmsg_data(nlh);
985         *f = flags;
986         xfrm_spd_getinfo(net, &si);
987         spc.incnt = si.incnt;
988         spc.outcnt = si.outcnt;
989         spc.fwdcnt = si.fwdcnt;
990         spc.inscnt = si.inscnt;
991         spc.outscnt = si.outscnt;
992         spc.fwdscnt = si.fwdscnt;
993         sph.spdhcnt = si.spdhcnt;
994         sph.spdhmcnt = si.spdhmcnt;
995 
996         err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
997         if (!err)
998                 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
999         if (err) {
1000                 nlmsg_cancel(skb, nlh);
1001                 return err;
1002         }
1003 
1004         return nlmsg_end(skb, nlh);
1005 }
1006 
1007 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1008                 struct nlattr **attrs)
1009 {
1010         struct net *net = sock_net(skb->sk);
1011         struct sk_buff *r_skb;
1012         u32 *flags = nlmsg_data(nlh);
1013         u32 sportid = NETLINK_CB(skb).portid;
1014         u32 seq = nlh->nlmsg_seq;
1015 
1016         r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1017         if (r_skb == NULL)
1018                 return -ENOMEM;
1019 
1020         if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1021                 BUG();
1022 
1023         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1024 }
1025 
1026 static inline size_t xfrm_sadinfo_msgsize(void)
1027 {
1028         return NLMSG_ALIGN(4)
1029                + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1030                + nla_total_size(4); /* XFRMA_SAD_CNT */
1031 }
1032 
1033 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1034                          u32 portid, u32 seq, u32 flags)
1035 {
1036         struct xfrmk_sadinfo si;
1037         struct xfrmu_sadhinfo sh;
1038         struct nlmsghdr *nlh;
1039         int err;
1040         u32 *f;
1041 
1042         nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1043         if (nlh == NULL) /* shouldn't really happen ... */
1044                 return -EMSGSIZE;
1045 
1046         f = nlmsg_data(nlh);
1047         *f = flags;
1048         xfrm_sad_getinfo(net, &si);
1049 
1050         sh.sadhmcnt = si.sadhmcnt;
1051         sh.sadhcnt = si.sadhcnt;
1052 
1053         err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1054         if (!err)
1055                 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1056         if (err) {
1057                 nlmsg_cancel(skb, nlh);
1058                 return err;
1059         }
1060 
1061         return nlmsg_end(skb, nlh);
1062 }
1063 
1064 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1065                 struct nlattr **attrs)
1066 {
1067         struct net *net = sock_net(skb->sk);
1068         struct sk_buff *r_skb;
1069         u32 *flags = nlmsg_data(nlh);
1070         u32 sportid = NETLINK_CB(skb).portid;
1071         u32 seq = nlh->nlmsg_seq;
1072 
1073         r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1074         if (r_skb == NULL)
1075                 return -ENOMEM;
1076 
1077         if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1078                 BUG();
1079 
1080         return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1081 }
1082 
1083 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1084                 struct nlattr **attrs)
1085 {
1086         struct net *net = sock_net(skb->sk);
1087         struct xfrm_usersa_id *p = nlmsg_data(nlh);
1088         struct xfrm_state *x;
1089         struct sk_buff *resp_skb;
1090         int err = -ESRCH;
1091 
1092         x = xfrm_user_state_lookup(net, p, attrs, &err);
1093         if (x == NULL)
1094                 goto out_noput;
1095 
1096         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1097         if (IS_ERR(resp_skb)) {
1098                 err = PTR_ERR(resp_skb);
1099         } else {
1100                 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1101         }
1102         xfrm_state_put(x);
1103 out_noput:
1104         return err;
1105 }
1106 
1107 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1108                 struct nlattr **attrs)
1109 {
1110         struct net *net = sock_net(skb->sk);
1111         struct xfrm_state *x;
1112         struct xfrm_userspi_info *p;
1113         struct sk_buff *resp_skb;
1114         xfrm_address_t *daddr;
1115         int family;
1116         int err;
1117         u32 mark;
1118         struct xfrm_mark m;
1119 
1120         p = nlmsg_data(nlh);
1121         err = verify_spi_info(p->info.id.proto, p->min, p->max);
1122         if (err)
1123                 goto out_noput;
1124 
1125         family = p->info.family;
1126         daddr = &p->info.id.daddr;
1127 
1128         x = NULL;
1129 
1130         mark = xfrm_mark_get(attrs, &m);
1131         if (p->info.seq) {
1132                 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1133                 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1134                         xfrm_state_put(x);
1135                         x = NULL;
1136                 }
1137         }
1138 
1139         if (!x)
1140                 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1141                                   p->info.id.proto, daddr,
1142                                   &p->info.saddr, 1,
1143                                   family);
1144         err = -ENOENT;
1145         if (x == NULL)
1146                 goto out_noput;
1147 
1148         err = xfrm_alloc_spi(x, p->min, p->max);
1149         if (err)
1150                 goto out;
1151 
1152         resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1153         if (IS_ERR(resp_skb)) {
1154                 err = PTR_ERR(resp_skb);
1155                 goto out;
1156         }
1157 
1158         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1159 
1160 out:
1161         xfrm_state_put(x);
1162 out_noput:
1163         return err;
1164 }
1165 
1166 static int verify_policy_dir(u8 dir)
1167 {
1168         switch (dir) {
1169         case XFRM_POLICY_IN:
1170         case XFRM_POLICY_OUT:
1171         case XFRM_POLICY_FWD:
1172                 break;
1173 
1174         default:
1175                 return -EINVAL;
1176         }
1177 
1178         return 0;
1179 }
1180 
1181 static int verify_policy_type(u8 type)
1182 {
1183         switch (type) {
1184         case XFRM_POLICY_TYPE_MAIN:
1185 #ifdef CONFIG_XFRM_SUB_POLICY
1186         case XFRM_POLICY_TYPE_SUB:
1187 #endif
1188                 break;
1189 
1190         default:
1191                 return -EINVAL;
1192         }
1193 
1194         return 0;
1195 }
1196 
1197 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1198 {
1199         int ret;
1200 
1201         switch (p->share) {
1202         case XFRM_SHARE_ANY:
1203         case XFRM_SHARE_SESSION:
1204         case XFRM_SHARE_USER:
1205         case XFRM_SHARE_UNIQUE:
1206                 break;
1207 
1208         default:
1209                 return -EINVAL;
1210         }
1211 
1212         switch (p->action) {
1213         case XFRM_POLICY_ALLOW:
1214         case XFRM_POLICY_BLOCK:
1215                 break;
1216 
1217         default:
1218                 return -EINVAL;
1219         }
1220 
1221         switch (p->sel.family) {
1222         case AF_INET:
1223                 break;
1224 
1225         case AF_INET6:
1226 #if IS_ENABLED(CONFIG_IPV6)
1227                 break;
1228 #else
1229                 return  -EAFNOSUPPORT;
1230 #endif
1231 
1232         default:
1233                 return -EINVAL;
1234         }
1235 
1236         ret = verify_policy_dir(p->dir);
1237         if (ret)
1238                 return ret;
1239         if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1240                 return -EINVAL;
1241 
1242         return 0;
1243 }
1244 
1245 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1246 {
1247         struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1248         struct xfrm_user_sec_ctx *uctx;
1249 
1250         if (!rt)
1251                 return 0;
1252 
1253         uctx = nla_data(rt);
1254         return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1255 }
1256 
1257 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1258                            int nr)
1259 {
1260         int i;
1261 
1262         xp->xfrm_nr = nr;
1263         for (i = 0; i < nr; i++, ut++) {
1264                 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1265 
1266                 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1267                 memcpy(&t->saddr, &ut->saddr,
1268                        sizeof(xfrm_address_t));
1269                 t->reqid = ut->reqid;
1270                 t->mode = ut->mode;
1271                 t->share = ut->share;
1272                 t->optional = ut->optional;
1273                 t->aalgos = ut->aalgos;
1274                 t->ealgos = ut->ealgos;
1275                 t->calgos = ut->calgos;
1276                 /* If all masks are ~0, then we allow all algorithms. */
1277                 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1278                 t->encap_family = ut->family;
1279         }
1280 }
1281 
1282 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1283 {
1284         int i;
1285 
1286         if (nr > XFRM_MAX_DEPTH)
1287                 return -EINVAL;
1288 
1289         for (i = 0; i < nr; i++) {
1290                 /* We never validated the ut->family value, so many
1291                  * applications simply leave it at zero.  The check was
1292                  * never made and ut->family was ignored because all
1293                  * templates could be assumed to have the same family as
1294                  * the policy itself.  Now that we will have ipv4-in-ipv6
1295                  * and ipv6-in-ipv4 tunnels, this is no longer true.
1296                  */
1297                 if (!ut[i].family)
1298                         ut[i].family = family;
1299 
1300                 switch (ut[i].family) {
1301                 case AF_INET:
1302                         break;
1303 #if IS_ENABLED(CONFIG_IPV6)
1304                 case AF_INET6:
1305                         break;
1306 #endif
1307                 default:
1308                         return -EINVAL;
1309                 }
1310         }
1311 
1312         return 0;
1313 }
1314 
1315 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1316 {
1317         struct nlattr *rt = attrs[XFRMA_TMPL];
1318 
1319         if (!rt) {
1320                 pol->xfrm_nr = 0;
1321         } else {
1322                 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1323                 int nr = nla_len(rt) / sizeof(*utmpl);
1324                 int err;
1325 
1326                 err = validate_tmpl(nr, utmpl, pol->family);
1327                 if (err)
1328                         return err;
1329 
1330                 copy_templates(pol, utmpl, nr);
1331         }
1332         return 0;
1333 }
1334 
1335 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1336 {
1337         struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1338         struct xfrm_userpolicy_type *upt;
1339         u8 type = XFRM_POLICY_TYPE_MAIN;
1340         int err;
1341 
1342         if (rt) {
1343                 upt = nla_data(rt);
1344                 type = upt->type;
1345         }
1346 
1347         err = verify_policy_type(type);
1348         if (err)
1349                 return err;
1350 
1351         *tp = type;
1352         return 0;
1353 }
1354 
1355 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1356 {
1357         xp->priority = p->priority;
1358         xp->index = p->index;
1359         memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1360         memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1361         xp->action = p->action;
1362         xp->flags = p->flags;
1363         xp->family = p->sel.family;
1364         /* XXX xp->share = p->share; */
1365 }
1366 
1367 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1368 {
1369         memset(p, 0, sizeof(*p));
1370         memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1371         memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1372         memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1373         p->priority = xp->priority;
1374         p->index = xp->index;
1375         p->sel.family = xp->family;
1376         p->dir = dir;
1377         p->action = xp->action;
1378         p->flags = xp->flags;
1379         p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1380 }
1381 
1382 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1383 {
1384         struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1385         int err;
1386 
1387         if (!xp) {
1388                 *errp = -ENOMEM;
1389                 return NULL;
1390         }
1391 
1392         copy_from_user_policy(xp, p);
1393 
1394         err = copy_from_user_policy_type(&xp->type, attrs);
1395         if (err)
1396                 goto error;
1397 
1398         if (!(err = copy_from_user_tmpl(xp, attrs)))
1399                 err = copy_from_user_sec_ctx(xp, attrs);
1400         if (err)
1401                 goto error;
1402 
1403         xfrm_mark_get(attrs, &xp->mark);
1404 
1405         return xp;
1406  error:
1407         *errp = err;
1408         xp->walk.dead = 1;
1409         xfrm_policy_destroy(xp);
1410         return NULL;
1411 }
1412 
1413 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1414                 struct nlattr **attrs)
1415 {
1416         struct net *net = sock_net(skb->sk);
1417         struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1418         struct xfrm_policy *xp;
1419         struct km_event c;
1420         int err;
1421         int excl;
1422 
1423         err = verify_newpolicy_info(p);
1424         if (err)
1425                 return err;
1426         err = verify_sec_ctx_len(attrs);
1427         if (err)
1428                 return err;
1429 
1430         xp = xfrm_policy_construct(net, p, attrs, &err);
1431         if (!xp)
1432                 return err;
1433 
1434         /* shouldn't excl be based on nlh flags??
1435          * Aha! this is anti-netlink really i.e  more pfkey derived
1436          * in netlink excl is a flag and you wouldnt need
1437          * a type XFRM_MSG_UPDPOLICY - JHS */
1438         excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1439         err = xfrm_policy_insert(p->dir, xp, excl);
1440         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1441 
1442         if (err) {
1443                 security_xfrm_policy_free(xp->security);
1444                 kfree(xp);
1445                 return err;
1446         }
1447 
1448         c.event = nlh->nlmsg_type;
1449         c.seq = nlh->nlmsg_seq;
1450         c.portid = nlh->nlmsg_pid;
1451         km_policy_notify(xp, p->dir, &c);
1452 
1453         xfrm_pol_put(xp);
1454 
1455         return 0;
1456 }
1457 
1458 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1459 {
1460         struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1461         int i;
1462 
1463         if (xp->xfrm_nr == 0)
1464                 return 0;
1465 
1466         for (i = 0; i < xp->xfrm_nr; i++) {
1467                 struct xfrm_user_tmpl *up = &vec[i];
1468                 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1469 
1470                 memset(up, 0, sizeof(*up));
1471                 memcpy(&up->id, &kp->id, sizeof(up->id));
1472                 up->family = kp->encap_family;
1473                 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1474                 up->reqid = kp->reqid;
1475                 up->mode = kp->mode;
1476                 up->share = kp->share;
1477                 up->optional = kp->optional;
1478                 up->aalgos = kp->aalgos;
1479                 up->ealgos = kp->ealgos;
1480                 up->calgos = kp->calgos;
1481         }
1482 
1483         return nla_put(skb, XFRMA_TMPL,
1484                        sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1485 }
1486 
1487 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1488 {
1489         if (x->security) {
1490                 return copy_sec_ctx(x->security, skb);
1491         }
1492         return 0;
1493 }
1494 
1495 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1496 {
1497         if (xp->security)
1498                 return copy_sec_ctx(xp->security, skb);
1499         return 0;
1500 }
1501 static inline size_t userpolicy_type_attrsize(void)
1502 {
1503 #ifdef CONFIG_XFRM_SUB_POLICY
1504         return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1505 #else
1506         return 0;
1507 #endif
1508 }
1509 
1510 #ifdef CONFIG_XFRM_SUB_POLICY
1511 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1512 {
1513         struct xfrm_userpolicy_type upt = {
1514                 .type = type,
1515         };
1516 
1517         return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1518 }
1519 
1520 #else
1521 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1522 {
1523         return 0;
1524 }
1525 #endif
1526 
1527 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1528 {
1529         struct xfrm_dump_info *sp = ptr;
1530         struct xfrm_userpolicy_info *p;
1531         struct sk_buff *in_skb = sp->in_skb;
1532         struct sk_buff *skb = sp->out_skb;
1533         struct nlmsghdr *nlh;
1534         int err;
1535 
1536         nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1537                         XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1538         if (nlh == NULL)
1539                 return -EMSGSIZE;
1540 
1541         p = nlmsg_data(nlh);
1542         copy_to_user_policy(xp, p, dir);
1543         err = copy_to_user_tmpl(xp, skb);
1544         if (!err)
1545                 err = copy_to_user_sec_ctx(xp, skb);
1546         if (!err)
1547                 err = copy_to_user_policy_type(xp->type, skb);
1548         if (!err)
1549                 err = xfrm_mark_put(skb, &xp->mark);
1550         if (err) {
1551                 nlmsg_cancel(skb, nlh);
1552                 return err;
1553         }
1554         nlmsg_end(skb, nlh);
1555         return 0;
1556 }
1557 
1558 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1559 {
1560         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1561         struct net *net = sock_net(cb->skb->sk);
1562 
1563         xfrm_policy_walk_done(walk, net);
1564         return 0;
1565 }
1566 
1567 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1568 {
1569         struct net *net = sock_net(skb->sk);
1570         struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1571         struct xfrm_dump_info info;
1572 
1573         BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1574                      sizeof(cb->args) - sizeof(cb->args[0]));
1575 
1576         info.in_skb = cb->skb;
1577         info.out_skb = skb;
1578         info.nlmsg_seq = cb->nlh->nlmsg_seq;
1579         info.nlmsg_flags = NLM_F_MULTI;
1580 
1581         if (!cb->args[0]) {
1582                 cb->args[0] = 1;
1583                 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1584         }
1585 
1586         (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1587 
1588         return skb->len;
1589 }
1590 
1591 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1592                                           struct xfrm_policy *xp,
1593                                           int dir, u32 seq)
1594 {
1595         struct xfrm_dump_info info;
1596         struct sk_buff *skb;
1597         int err;
1598 
1599         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1600         if (!skb)
1601                 return ERR_PTR(-ENOMEM);
1602 
1603         info.in_skb = in_skb;
1604         info.out_skb = skb;
1605         info.nlmsg_seq = seq;
1606         info.nlmsg_flags = 0;
1607 
1608         err = dump_one_policy(xp, dir, 0, &info);
1609         if (err) {
1610                 kfree_skb(skb);
1611                 return ERR_PTR(err);
1612         }
1613 
1614         return skb;
1615 }
1616 
1617 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1618                 struct nlattr **attrs)
1619 {
1620         struct net *net = sock_net(skb->sk);
1621         struct xfrm_policy *xp;
1622         struct xfrm_userpolicy_id *p;
1623         u8 type = XFRM_POLICY_TYPE_MAIN;
1624         int err;
1625         struct km_event c;
1626         int delete;
1627         struct xfrm_mark m;
1628         u32 mark = xfrm_mark_get(attrs, &m);
1629 
1630         p = nlmsg_data(nlh);
1631         delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1632 
1633         err = copy_from_user_policy_type(&type, attrs);
1634         if (err)
1635                 return err;
1636 
1637         err = verify_policy_dir(p->dir);
1638         if (err)
1639                 return err;
1640 
1641         if (p->index)
1642                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1643         else {
1644                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1645                 struct xfrm_sec_ctx *ctx;
1646 
1647                 err = verify_sec_ctx_len(attrs);
1648                 if (err)
1649                         return err;
1650 
1651                 ctx = NULL;
1652                 if (rt) {
1653                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1654 
1655                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1656                         if (err)
1657                                 return err;
1658                 }
1659                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1660                                            ctx, delete, &err);
1661                 security_xfrm_policy_free(ctx);
1662         }
1663         if (xp == NULL)
1664                 return -ENOENT;
1665 
1666         if (!delete) {
1667                 struct sk_buff *resp_skb;
1668 
1669                 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1670                 if (IS_ERR(resp_skb)) {
1671                         err = PTR_ERR(resp_skb);
1672                 } else {
1673                         err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1674                                             NETLINK_CB(skb).portid);
1675                 }
1676         } else {
1677                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1678 
1679                 if (err != 0)
1680                         goto out;
1681 
1682                 c.data.byid = p->index;
1683                 c.event = nlh->nlmsg_type;
1684                 c.seq = nlh->nlmsg_seq;
1685                 c.portid = nlh->nlmsg_pid;
1686                 km_policy_notify(xp, p->dir, &c);
1687         }
1688 
1689 out:
1690         xfrm_pol_put(xp);
1691         if (delete && err == 0)
1692                 xfrm_garbage_collect(net);
1693         return err;
1694 }
1695 
1696 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1697                 struct nlattr **attrs)
1698 {
1699         struct net *net = sock_net(skb->sk);
1700         struct km_event c;
1701         struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1702         int err;
1703 
1704         err = xfrm_state_flush(net, p->proto, true);
1705         if (err) {
1706                 if (err == -ESRCH) /* empty table */
1707                         return 0;
1708                 return err;
1709         }
1710         c.data.proto = p->proto;
1711         c.event = nlh->nlmsg_type;
1712         c.seq = nlh->nlmsg_seq;
1713         c.portid = nlh->nlmsg_pid;
1714         c.net = net;
1715         km_state_notify(NULL, &c);
1716 
1717         return 0;
1718 }
1719 
1720 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1721 {
1722         size_t replay_size = x->replay_esn ?
1723                               xfrm_replay_state_esn_len(x->replay_esn) :
1724                               sizeof(struct xfrm_replay_state);
1725 
1726         return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1727                + nla_total_size(replay_size)
1728                + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1729                + nla_total_size(sizeof(struct xfrm_mark))
1730                + nla_total_size(4) /* XFRM_AE_RTHR */
1731                + nla_total_size(4); /* XFRM_AE_ETHR */
1732 }
1733 
1734 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1735 {
1736         struct xfrm_aevent_id *id;
1737         struct nlmsghdr *nlh;
1738         int err;
1739 
1740         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1741         if (nlh == NULL)
1742                 return -EMSGSIZE;
1743 
1744         id = nlmsg_data(nlh);
1745         memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1746         id->sa_id.spi = x->id.spi;
1747         id->sa_id.family = x->props.family;
1748         id->sa_id.proto = x->id.proto;
1749         memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1750         id->reqid = x->props.reqid;
1751         id->flags = c->data.aevent;
1752 
1753         if (x->replay_esn) {
1754                 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1755                               xfrm_replay_state_esn_len(x->replay_esn),
1756                               x->replay_esn);
1757         } else {
1758                 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1759                               &x->replay);
1760         }
1761         if (err)
1762                 goto out_cancel;
1763         err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1764         if (err)
1765                 goto out_cancel;
1766 
1767         if (id->flags & XFRM_AE_RTHR) {
1768                 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1769                 if (err)
1770                         goto out_cancel;
1771         }
1772         if (id->flags & XFRM_AE_ETHR) {
1773                 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1774                                   x->replay_maxage * 10 / HZ);
1775                 if (err)
1776                         goto out_cancel;
1777         }
1778         err = xfrm_mark_put(skb, &x->mark);
1779         if (err)
1780                 goto out_cancel;
1781 
1782         return nlmsg_end(skb, nlh);
1783 
1784 out_cancel:
1785         nlmsg_cancel(skb, nlh);
1786         return err;
1787 }
1788 
1789 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1790                 struct nlattr **attrs)
1791 {
1792         struct net *net = sock_net(skb->sk);
1793         struct xfrm_state *x;
1794         struct sk_buff *r_skb;
1795         int err;
1796         struct km_event c;
1797         u32 mark;
1798         struct xfrm_mark m;
1799         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1800         struct xfrm_usersa_id *id = &p->sa_id;
1801 
1802         mark = xfrm_mark_get(attrs, &m);
1803 
1804         x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1805         if (x == NULL)
1806                 return -ESRCH;
1807 
1808         r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1809         if (r_skb == NULL) {
1810                 xfrm_state_put(x);
1811                 return -ENOMEM;
1812         }
1813 
1814         /*
1815          * XXX: is this lock really needed - none of the other
1816          * gets lock (the concern is things getting updated
1817          * while we are still reading) - jhs
1818         */
1819         spin_lock_bh(&x->lock);
1820         c.data.aevent = p->flags;
1821         c.seq = nlh->nlmsg_seq;
1822         c.portid = nlh->nlmsg_pid;
1823 
1824         if (build_aevent(r_skb, x, &c) < 0)
1825                 BUG();
1826         err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1827         spin_unlock_bh(&x->lock);
1828         xfrm_state_put(x);
1829         return err;
1830 }
1831 
1832 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1833                 struct nlattr **attrs)
1834 {
1835         struct net *net = sock_net(skb->sk);
1836         struct xfrm_state *x;
1837         struct km_event c;
1838         int err = -EINVAL;
1839         u32 mark = 0;
1840         struct xfrm_mark m;
1841         struct xfrm_aevent_id *p = nlmsg_data(nlh);
1842         struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1843         struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1844         struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1845 
1846         if (!lt && !rp && !re)
1847                 return err;
1848 
1849         /* pedantic mode - thou shalt sayeth replaceth */
1850         if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1851                 return err;
1852 
1853         mark = xfrm_mark_get(attrs, &m);
1854 
1855         x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1856         if (x == NULL)
1857                 return -ESRCH;
1858 
1859         if (x->km.state != XFRM_STATE_VALID)
1860                 goto out;
1861 
1862         err = xfrm_replay_verify_len(x->replay_esn, re);
1863         if (err)
1864                 goto out;
1865 
1866         spin_lock_bh(&x->lock);
1867         xfrm_update_ae_params(x, attrs, 1);
1868         spin_unlock_bh(&x->lock);
1869 
1870         c.event = nlh->nlmsg_type;
1871         c.seq = nlh->nlmsg_seq;
1872         c.portid = nlh->nlmsg_pid;
1873         c.data.aevent = XFRM_AE_CU;
1874         km_state_notify(x, &c);
1875         err = 0;
1876 out:
1877         xfrm_state_put(x);
1878         return err;
1879 }
1880 
1881 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1882                 struct nlattr **attrs)
1883 {
1884         struct net *net = sock_net(skb->sk);
1885         struct km_event c;
1886         u8 type = XFRM_POLICY_TYPE_MAIN;
1887         int err;
1888 
1889         err = copy_from_user_policy_type(&type, attrs);
1890         if (err)
1891                 return err;
1892 
1893         err = xfrm_policy_flush(net, type, true);
1894         if (err) {
1895                 if (err == -ESRCH) /* empty table */
1896                         return 0;
1897                 return err;
1898         }
1899 
1900         c.data.type = type;
1901         c.event = nlh->nlmsg_type;
1902         c.seq = nlh->nlmsg_seq;
1903         c.portid = nlh->nlmsg_pid;
1904         c.net = net;
1905         km_policy_notify(NULL, 0, &c);
1906         return 0;
1907 }
1908 
1909 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1910                 struct nlattr **attrs)
1911 {
1912         struct net *net = sock_net(skb->sk);
1913         struct xfrm_policy *xp;
1914         struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1915         struct xfrm_userpolicy_info *p = &up->pol;
1916         u8 type = XFRM_POLICY_TYPE_MAIN;
1917         int err = -ENOENT;
1918         struct xfrm_mark m;
1919         u32 mark = xfrm_mark_get(attrs, &m);
1920 
1921         err = copy_from_user_policy_type(&type, attrs);
1922         if (err)
1923                 return err;
1924 
1925         err = verify_policy_dir(p->dir);
1926         if (err)
1927                 return err;
1928 
1929         if (p->index)
1930                 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1931         else {
1932                 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1933                 struct xfrm_sec_ctx *ctx;
1934 
1935                 err = verify_sec_ctx_len(attrs);
1936                 if (err)
1937                         return err;
1938 
1939                 ctx = NULL;
1940                 if (rt) {
1941                         struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1942 
1943                         err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1944                         if (err)
1945                                 return err;
1946                 }
1947                 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1948                                            &p->sel, ctx, 0, &err);
1949                 security_xfrm_policy_free(ctx);
1950         }
1951         if (xp == NULL)
1952                 return -ENOENT;
1953 
1954         if (unlikely(xp->walk.dead))
1955                 goto out;
1956 
1957         err = 0;
1958         if (up->hard) {
1959                 xfrm_policy_delete(xp, p->dir);
1960                 xfrm_audit_policy_delete(xp, 1, true);
1961         } else {
1962                 // reset the timers here?
1963                 WARN(1, "Dont know what to do with soft policy expire\n");
1964         }
1965         km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
1966 
1967 out:
1968         xfrm_pol_put(xp);
1969         return err;
1970 }
1971 
1972 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1973                 struct nlattr **attrs)
1974 {
1975         struct net *net = sock_net(skb->sk);
1976         struct xfrm_state *x;
1977         int err;
1978         struct xfrm_user_expire *ue = nlmsg_data(nlh);
1979         struct xfrm_usersa_info *p = &ue->state;
1980         struct xfrm_mark m;
1981         u32 mark = xfrm_mark_get(attrs, &m);
1982 
1983         x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1984 
1985         err = -ENOENT;
1986         if (x == NULL)
1987                 return err;
1988 
1989         spin_lock_bh(&x->lock);
1990         err = -EINVAL;
1991         if (x->km.state != XFRM_STATE_VALID)
1992                 goto out;
1993         km_state_expired(x, ue->hard, nlh->nlmsg_pid);
1994 
1995         if (ue->hard) {
1996                 __xfrm_state_delete(x);
1997                 xfrm_audit_state_delete(x, 1, true);
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         struct net *net = sock_net(skb->sk);
2120 
2121         if (attrs[XFRMA_MIGRATE] == NULL)
2122                 return -EINVAL;
2123 
2124         kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2125 
2126         err = copy_from_user_policy_type(&type, attrs);
2127         if (err)
2128                 return err;
2129 
2130         err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2131         if (err)
2132                 return err;
2133 
2134         if (!n)
2135                 return 0;
2136 
2137         xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2138 
2139         return 0;
2140 }
2141 #else
2142 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2143                            struct nlattr **attrs)
2144 {
2145         return -ENOPROTOOPT;
2146 }
2147 #endif
2148 
2149 #ifdef CONFIG_XFRM_MIGRATE
2150 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2151 {
2152         struct xfrm_user_migrate um;
2153 
2154         memset(&um, 0, sizeof(um));
2155         um.proto = m->proto;
2156         um.mode = m->mode;
2157         um.reqid = m->reqid;
2158         um.old_family = m->old_family;
2159         memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2160         memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2161         um.new_family = m->new_family;
2162         memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2163         memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2164 
2165         return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2166 }
2167 
2168 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2169 {
2170         struct xfrm_user_kmaddress uk;
2171 
2172         memset(&uk, 0, sizeof(uk));
2173         uk.family = k->family;
2174         uk.reserved = k->reserved;
2175         memcpy(&uk.local, &k->local, sizeof(uk.local));
2176         memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2177 
2178         return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2179 }
2180 
2181 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2182 {
2183         return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2184               + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2185               + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2186               + userpolicy_type_attrsize();
2187 }
2188 
2189 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2190                          int num_migrate, const struct xfrm_kmaddress *k,
2191                          const struct xfrm_selector *sel, u8 dir, u8 type)
2192 {
2193         const struct xfrm_migrate *mp;
2194         struct xfrm_userpolicy_id *pol_id;
2195         struct nlmsghdr *nlh;
2196         int i, err;
2197 
2198         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2199         if (nlh == NULL)
2200                 return -EMSGSIZE;
2201 
2202         pol_id = nlmsg_data(nlh);
2203         /* copy data from selector, dir, and type to the pol_id */
2204         memset(pol_id, 0, sizeof(*pol_id));
2205         memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2206         pol_id->dir = dir;
2207 
2208         if (k != NULL) {
2209                 err = copy_to_user_kmaddress(k, skb);
2210                 if (err)
2211                         goto out_cancel;
2212         }
2213         err = copy_to_user_policy_type(type, skb);
2214         if (err)
2215                 goto out_cancel;
2216         for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2217                 err = copy_to_user_migrate(mp, skb);
2218                 if (err)
2219                         goto out_cancel;
2220         }
2221 
2222         return nlmsg_end(skb, nlh);
2223 
2224 out_cancel:
2225         nlmsg_cancel(skb, nlh);
2226         return err;
2227 }
2228 
2229 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2230                              const struct xfrm_migrate *m, int num_migrate,
2231                              const struct xfrm_kmaddress *k)
2232 {
2233         struct net *net = &init_net;
2234         struct sk_buff *skb;
2235 
2236         skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2237         if (skb == NULL)
2238                 return -ENOMEM;
2239 
2240         /* build migrate */
2241         if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2242                 BUG();
2243 
2244         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2245 }
2246 #else
2247 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2248                              const struct xfrm_migrate *m, int num_migrate,
2249                              const struct xfrm_kmaddress *k)
2250 {
2251         return -ENOPROTOOPT;
2252 }
2253 #endif
2254 
2255 #define XMSGSIZE(type) sizeof(struct type)
2256 
2257 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2258         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2259         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2260         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2261         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2262         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2263         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2264         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2265         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2266         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2267         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2268         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2269         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2270         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2271         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2272         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2273         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2274         [XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2275         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2276         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = sizeof(u32),
2277         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = sizeof(u32),
2278 };
2279 
2280 #undef XMSGSIZE
2281 
2282 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2283         [XFRMA_SA]              = { .len = sizeof(struct xfrm_usersa_info)},
2284         [XFRMA_POLICY]          = { .len = sizeof(struct xfrm_userpolicy_info)},
2285         [XFRMA_LASTUSED]        = { .type = NLA_U64},
2286         [XFRMA_ALG_AUTH_TRUNC]  = { .len = sizeof(struct xfrm_algo_auth)},
2287         [XFRMA_ALG_AEAD]        = { .len = sizeof(struct xfrm_algo_aead) },
2288         [XFRMA_ALG_AUTH]        = { .len = sizeof(struct xfrm_algo) },
2289         [XFRMA_ALG_CRYPT]       = { .len = sizeof(struct xfrm_algo) },
2290         [XFRMA_ALG_COMP]        = { .len = sizeof(struct xfrm_algo) },
2291         [XFRMA_ENCAP]           = { .len = sizeof(struct xfrm_encap_tmpl) },
2292         [XFRMA_TMPL]            = { .len = sizeof(struct xfrm_user_tmpl) },
2293         [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_sec_ctx) },
2294         [XFRMA_LTIME_VAL]       = { .len = sizeof(struct xfrm_lifetime_cur) },
2295         [XFRMA_REPLAY_VAL]      = { .len = sizeof(struct xfrm_replay_state) },
2296         [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },
2297         [XFRMA_ETIMER_THRESH]   = { .type = NLA_U32 },
2298         [XFRMA_SRCADDR]         = { .len = sizeof(xfrm_address_t) },
2299         [XFRMA_COADDR]          = { .len = sizeof(xfrm_address_t) },
2300         [XFRMA_POLICY_TYPE]     = { .len = sizeof(struct xfrm_userpolicy_type)},
2301         [XFRMA_MIGRATE]         = { .len = sizeof(struct xfrm_user_migrate) },
2302         [XFRMA_KMADDRESS]       = { .len = sizeof(struct xfrm_user_kmaddress) },
2303         [XFRMA_MARK]            = { .len = sizeof(struct xfrm_mark) },
2304         [XFRMA_TFCPAD]          = { .type = NLA_U32 },
2305         [XFRMA_REPLAY_ESN_VAL]  = { .len = sizeof(struct xfrm_replay_state_esn) },
2306         [XFRMA_SA_EXTRA_FLAGS]  = { .type = NLA_U32 },
2307         [XFRMA_PROTO]           = { .type = NLA_U8 },
2308         [XFRMA_ADDRESS_FILTER]  = { .len = sizeof(struct xfrm_address_filter) },
2309 };
2310 
2311 static const struct xfrm_link {
2312         int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2313         int (*dump)(struct sk_buff *, struct netlink_callback *);
2314         int (*done)(struct netlink_callback *);
2315 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2316         [XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2317         [XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
2318         [XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2319                                                    .dump = xfrm_dump_sa,
2320                                                    .done = xfrm_dump_sa_done  },
2321         [XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2322         [XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
2323         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2324                                                    .dump = xfrm_dump_policy,
2325                                                    .done = xfrm_dump_policy_done },
2326         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2327         [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
2328         [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2329         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
2330         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
2331         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2332         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
2333         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
2334         [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
2335         [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
2336         [XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
2337         [XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
2338         [XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
2339 };
2340 
2341 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2342 {
2343         struct net *net = sock_net(skb->sk);
2344         struct nlattr *attrs[XFRMA_MAX+1];
2345         const struct xfrm_link *link;
2346         int type, err;
2347 
2348         type = nlh->nlmsg_type;
2349         if (type > XFRM_MSG_MAX)
2350                 return -EINVAL;
2351 
2352         type -= XFRM_MSG_BASE;
2353         link = &xfrm_dispatch[type];
2354 
2355         /* All operations require privileges, even GET */
2356         if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2357                 return -EPERM;
2358 
2359         if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2360              type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2361             (nlh->nlmsg_flags & NLM_F_DUMP)) {
2362                 if (link->dump == NULL)
2363                         return -EINVAL;
2364 
2365                 {
2366                         struct netlink_dump_control c = {
2367                                 .dump = link->dump,
2368                                 .done = link->done,
2369                         };
2370                         return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2371                 }
2372         }
2373 
2374         err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2375                           xfrma_policy);
2376         if (err < 0)
2377                 return err;
2378 
2379         if (link->doit == NULL)
2380                 return -EINVAL;
2381 
2382         return link->doit(skb, nlh, attrs);
2383 }
2384 
2385 static void xfrm_netlink_rcv(struct sk_buff *skb)
2386 {
2387         struct net *net = sock_net(skb->sk);
2388 
2389         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2390         netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2391         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2392 }
2393 
2394 static inline size_t xfrm_expire_msgsize(void)
2395 {
2396         return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2397                + nla_total_size(sizeof(struct xfrm_mark));
2398 }
2399 
2400 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2401 {
2402         struct xfrm_user_expire *ue;
2403         struct nlmsghdr *nlh;
2404         int err;
2405 
2406         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2407         if (nlh == NULL)
2408                 return -EMSGSIZE;
2409 
2410         ue = nlmsg_data(nlh);
2411         copy_to_user_state(x, &ue->state);
2412         ue->hard = (c->data.hard != 0) ? 1 : 0;
2413 
2414         err = xfrm_mark_put(skb, &x->mark);
2415         if (err)
2416                 return err;
2417 
2418         return nlmsg_end(skb, nlh);
2419 }
2420 
2421 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2422 {
2423         struct net *net = xs_net(x);
2424         struct sk_buff *skb;
2425 
2426         skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2427         if (skb == NULL)
2428                 return -ENOMEM;
2429 
2430         if (build_expire(skb, x, c) < 0) {
2431                 kfree_skb(skb);
2432                 return -EMSGSIZE;
2433         }
2434 
2435         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2436 }
2437 
2438 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2439 {
2440         struct net *net = xs_net(x);
2441         struct sk_buff *skb;
2442 
2443         skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2444         if (skb == NULL)
2445                 return -ENOMEM;
2446 
2447         if (build_aevent(skb, x, c) < 0)
2448                 BUG();
2449 
2450         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2451 }
2452 
2453 static int xfrm_notify_sa_flush(const struct km_event *c)
2454 {
2455         struct net *net = c->net;
2456         struct xfrm_usersa_flush *p;
2457         struct nlmsghdr *nlh;
2458         struct sk_buff *skb;
2459         int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2460 
2461         skb = nlmsg_new(len, GFP_ATOMIC);
2462         if (skb == NULL)
2463                 return -ENOMEM;
2464 
2465         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2466         if (nlh == NULL) {
2467                 kfree_skb(skb);
2468                 return -EMSGSIZE;
2469         }
2470 
2471         p = nlmsg_data(nlh);
2472         p->proto = c->data.proto;
2473 
2474         nlmsg_end(skb, nlh);
2475 
2476         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2477 }
2478 
2479 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2480 {
2481         size_t l = 0;
2482         if (x->aead)
2483                 l += nla_total_size(aead_len(x->aead));
2484         if (x->aalg) {
2485                 l += nla_total_size(sizeof(struct xfrm_algo) +
2486                                     (x->aalg->alg_key_len + 7) / 8);
2487                 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2488         }
2489         if (x->ealg)
2490                 l += nla_total_size(xfrm_alg_len(x->ealg));
2491         if (x->calg)
2492                 l += nla_total_size(sizeof(*x->calg));
2493         if (x->encap)
2494                 l += nla_total_size(sizeof(*x->encap));
2495         if (x->tfcpad)
2496                 l += nla_total_size(sizeof(x->tfcpad));
2497         if (x->replay_esn)
2498                 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2499         if (x->security)
2500                 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2501                                     x->security->ctx_len);
2502         if (x->coaddr)
2503                 l += nla_total_size(sizeof(*x->coaddr));
2504         if (x->props.extra_flags)
2505                 l += nla_total_size(sizeof(x->props.extra_flags));
2506 
2507         /* Must count x->lastused as it may become non-zero behind our back. */
2508         l += nla_total_size(sizeof(u64));
2509 
2510         return l;
2511 }
2512 
2513 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2514 {
2515         struct net *net = xs_net(x);
2516         struct xfrm_usersa_info *p;
2517         struct xfrm_usersa_id *id;
2518         struct nlmsghdr *nlh;
2519         struct sk_buff *skb;
2520         int len = xfrm_sa_len(x);
2521         int headlen, err;
2522 
2523         headlen = sizeof(*p);
2524         if (c->event == XFRM_MSG_DELSA) {
2525                 len += nla_total_size(headlen);
2526                 headlen = sizeof(*id);
2527                 len += nla_total_size(sizeof(struct xfrm_mark));
2528         }
2529         len += NLMSG_ALIGN(headlen);
2530 
2531         skb = nlmsg_new(len, GFP_ATOMIC);
2532         if (skb == NULL)
2533                 return -ENOMEM;
2534 
2535         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2536         err = -EMSGSIZE;
2537         if (nlh == NULL)
2538                 goto out_free_skb;
2539 
2540         p = nlmsg_data(nlh);
2541         if (c->event == XFRM_MSG_DELSA) {
2542                 struct nlattr *attr;
2543 
2544                 id = nlmsg_data(nlh);
2545                 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2546                 id->spi = x->id.spi;
2547                 id->family = x->props.family;
2548                 id->proto = x->id.proto;
2549 
2550                 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2551                 err = -EMSGSIZE;
2552                 if (attr == NULL)
2553                         goto out_free_skb;
2554 
2555                 p = nla_data(attr);
2556         }
2557         err = copy_to_user_state_extra(x, p, skb);
2558         if (err)
2559                 goto out_free_skb;
2560 
2561         nlmsg_end(skb, nlh);
2562 
2563         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2564 
2565 out_free_skb:
2566         kfree_skb(skb);
2567         return err;
2568 }
2569 
2570 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2571 {
2572 
2573         switch (c->event) {
2574         case XFRM_MSG_EXPIRE:
2575                 return xfrm_exp_state_notify(x, c);
2576         case XFRM_MSG_NEWAE:
2577                 return xfrm_aevent_state_notify(x, c);
2578         case XFRM_MSG_DELSA:
2579         case XFRM_MSG_UPDSA:
2580         case XFRM_MSG_NEWSA:
2581                 return xfrm_notify_sa(x, c);
2582         case XFRM_MSG_FLUSHSA:
2583                 return xfrm_notify_sa_flush(c);
2584         default:
2585                 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2586                        c->event);
2587                 break;
2588         }
2589 
2590         return 0;
2591 
2592 }
2593 
2594 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2595                                           struct xfrm_policy *xp)
2596 {
2597         return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2598                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2599                + nla_total_size(sizeof(struct xfrm_mark))
2600                + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2601                + userpolicy_type_attrsize();
2602 }
2603 
2604 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2605                          struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2606 {
2607         __u32 seq = xfrm_get_acqseq();
2608         struct xfrm_user_acquire *ua;
2609         struct nlmsghdr *nlh;
2610         int err;
2611 
2612         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2613         if (nlh == NULL)
2614                 return -EMSGSIZE;
2615 
2616         ua = nlmsg_data(nlh);
2617         memcpy(&ua->id, &x->id, sizeof(ua->id));
2618         memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2619         memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2620         copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2621         ua->aalgos = xt->aalgos;
2622         ua->ealgos = xt->ealgos;
2623         ua->calgos = xt->calgos;
2624         ua->seq = x->km.seq = seq;
2625 
2626         err = copy_to_user_tmpl(xp, skb);
2627         if (!err)
2628                 err = copy_to_user_state_sec_ctx(x, skb);
2629         if (!err)
2630                 err = copy_to_user_policy_type(xp->type, skb);
2631         if (!err)
2632                 err = xfrm_mark_put(skb, &xp->mark);
2633         if (err) {
2634                 nlmsg_cancel(skb, nlh);
2635                 return err;
2636         }
2637 
2638         return nlmsg_end(skb, nlh);
2639 }
2640 
2641 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2642                              struct xfrm_policy *xp)
2643 {
2644         struct net *net = xs_net(x);
2645         struct sk_buff *skb;
2646 
2647         skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2648         if (skb == NULL)
2649                 return -ENOMEM;
2650 
2651         if (build_acquire(skb, x, xt, xp) < 0)
2652                 BUG();
2653 
2654         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2655 }
2656 
2657 /* User gives us xfrm_user_policy_info followed by an array of 0
2658  * or more templates.
2659  */
2660 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2661                                                u8 *data, int len, int *dir)
2662 {
2663         struct net *net = sock_net(sk);
2664         struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2665         struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2666         struct xfrm_policy *xp;
2667         int nr;
2668 
2669         switch (sk->sk_family) {
2670         case AF_INET:
2671                 if (opt != IP_XFRM_POLICY) {
2672                         *dir = -EOPNOTSUPP;
2673                         return NULL;
2674                 }
2675                 break;
2676 #if IS_ENABLED(CONFIG_IPV6)
2677         case AF_INET6:
2678                 if (opt != IPV6_XFRM_POLICY) {
2679                         *dir = -EOPNOTSUPP;
2680                         return NULL;
2681                 }
2682                 break;
2683 #endif
2684         default:
2685                 *dir = -EINVAL;
2686                 return NULL;
2687         }
2688 
2689         *dir = -EINVAL;
2690 
2691         if (len < sizeof(*p) ||
2692             verify_newpolicy_info(p))
2693                 return NULL;
2694 
2695         nr = ((len - sizeof(*p)) / sizeof(*ut));
2696         if (validate_tmpl(nr, ut, p->sel.family))
2697                 return NULL;
2698 
2699         if (p->dir > XFRM_POLICY_OUT)
2700                 return NULL;
2701 
2702         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2703         if (xp == NULL) {
2704                 *dir = -ENOBUFS;
2705                 return NULL;
2706         }
2707 
2708         copy_from_user_policy(xp, p);
2709         xp->type = XFRM_POLICY_TYPE_MAIN;
2710         copy_templates(xp, ut, nr);
2711 
2712         *dir = p->dir;
2713 
2714         return xp;
2715 }
2716 
2717 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2718 {
2719         return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2720                + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2721                + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2722                + nla_total_size(sizeof(struct xfrm_mark))
2723                + userpolicy_type_attrsize();
2724 }
2725 
2726 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2727                            int dir, const struct km_event *c)
2728 {
2729         struct xfrm_user_polexpire *upe;
2730         int hard = c->data.hard;
2731         struct nlmsghdr *nlh;
2732         int err;
2733 
2734         nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2735         if (nlh == NULL)
2736                 return -EMSGSIZE;
2737 
2738         upe = nlmsg_data(nlh);
2739         copy_to_user_policy(xp, &upe->pol, dir);
2740         err = copy_to_user_tmpl(xp, skb);
2741         if (!err)
2742                 err = copy_to_user_sec_ctx(xp, skb);
2743         if (!err)
2744                 err = copy_to_user_policy_type(xp->type, skb);
2745         if (!err)
2746                 err = xfrm_mark_put(skb, &xp->mark);
2747         if (err) {
2748                 nlmsg_cancel(skb, nlh);
2749                 return err;
2750         }
2751         upe->hard = !!hard;
2752 
2753         return nlmsg_end(skb, nlh);
2754 }
2755 
2756 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2757 {
2758         struct net *net = xp_net(xp);
2759         struct sk_buff *skb;
2760 
2761         skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2762         if (skb == NULL)
2763                 return -ENOMEM;
2764 
2765         if (build_polexpire(skb, xp, dir, c) < 0)
2766                 BUG();
2767 
2768         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2769 }
2770 
2771 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2772 {
2773         int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2774         struct net *net = xp_net(xp);
2775         struct xfrm_userpolicy_info *p;
2776         struct xfrm_userpolicy_id *id;
2777         struct nlmsghdr *nlh;
2778         struct sk_buff *skb;
2779         int headlen, err;
2780 
2781         headlen = sizeof(*p);
2782         if (c->event == XFRM_MSG_DELPOLICY) {
2783                 len += nla_total_size(headlen);
2784                 headlen = sizeof(*id);
2785         }
2786         len += userpolicy_type_attrsize();
2787         len += nla_total_size(sizeof(struct xfrm_mark));
2788         len += NLMSG_ALIGN(headlen);
2789 
2790         skb = nlmsg_new(len, GFP_ATOMIC);
2791         if (skb == NULL)
2792                 return -ENOMEM;
2793 
2794         nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2795         err = -EMSGSIZE;
2796         if (nlh == NULL)
2797                 goto out_free_skb;
2798 
2799         p = nlmsg_data(nlh);
2800         if (c->event == XFRM_MSG_DELPOLICY) {
2801                 struct nlattr *attr;
2802 
2803                 id = nlmsg_data(nlh);
2804                 memset(id, 0, sizeof(*id));
2805                 id->dir = dir;
2806                 if (c->data.byid)
2807                         id->index = xp->index;
2808                 else
2809                         memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2810 
2811                 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2812                 err = -EMSGSIZE;
2813                 if (attr == NULL)
2814                         goto out_free_skb;
2815 
2816                 p = nla_data(attr);
2817         }
2818 
2819         copy_to_user_policy(xp, p, dir);
2820         err = copy_to_user_tmpl(xp, skb);
2821         if (!err)
2822                 err = copy_to_user_policy_type(xp->type, skb);
2823         if (!err)
2824                 err = xfrm_mark_put(skb, &xp->mark);
2825         if (err)
2826                 goto out_free_skb;
2827 
2828         nlmsg_end(skb, nlh);
2829 
2830         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2831 
2832 out_free_skb:
2833         kfree_skb(skb);
2834         return err;
2835 }
2836 
2837 static int xfrm_notify_policy_flush(const struct km_event *c)
2838 {
2839         struct net *net = c->net;
2840         struct nlmsghdr *nlh;
2841         struct sk_buff *skb;
2842         int err;
2843 
2844         skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2845         if (skb == NULL)
2846                 return -ENOMEM;
2847 
2848         nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2849         err = -EMSGSIZE;
2850         if (nlh == NULL)
2851                 goto out_free_skb;
2852         err = copy_to_user_policy_type(c->data.type, skb);
2853         if (err)
2854                 goto out_free_skb;
2855 
2856         nlmsg_end(skb, nlh);
2857 
2858         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2859 
2860 out_free_skb:
2861         kfree_skb(skb);
2862         return err;
2863 }
2864 
2865 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2866 {
2867 
2868         switch (c->event) {
2869         case XFRM_MSG_NEWPOLICY:
2870         case XFRM_MSG_UPDPOLICY:
2871         case XFRM_MSG_DELPOLICY:
2872                 return xfrm_notify_policy(xp, dir, c);
2873         case XFRM_MSG_FLUSHPOLICY:
2874                 return xfrm_notify_policy_flush(c);
2875         case XFRM_MSG_POLEXPIRE:
2876                 return xfrm_exp_policy_notify(xp, dir, c);
2877         default:
2878                 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2879                        c->event);
2880         }
2881 
2882         return 0;
2883 
2884 }
2885 
2886 static inline size_t xfrm_report_msgsize(void)
2887 {
2888         return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2889 }
2890 
2891 static int build_report(struct sk_buff *skb, u8 proto,
2892                         struct xfrm_selector *sel, xfrm_address_t *addr)
2893 {
2894         struct xfrm_user_report *ur;
2895         struct nlmsghdr *nlh;
2896 
2897         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2898         if (nlh == NULL)
2899                 return -EMSGSIZE;
2900 
2901         ur = nlmsg_data(nlh);
2902         ur->proto = proto;
2903         memcpy(&ur->sel, sel, sizeof(ur->sel));
2904 
2905         if (addr) {
2906                 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2907                 if (err) {
2908                         nlmsg_cancel(skb, nlh);
2909                         return err;
2910                 }
2911         }
2912         return nlmsg_end(skb, nlh);
2913 }
2914 
2915 static int xfrm_send_report(struct net *net, u8 proto,
2916                             struct xfrm_selector *sel, xfrm_address_t *addr)
2917 {
2918         struct sk_buff *skb;
2919 
2920         skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2921         if (skb == NULL)
2922                 return -ENOMEM;
2923 
2924         if (build_report(skb, proto, sel, addr) < 0)
2925                 BUG();
2926 
2927         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
2928 }
2929 
2930 static inline size_t xfrm_mapping_msgsize(void)
2931 {
2932         return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2933 }
2934 
2935 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2936                          xfrm_address_t *new_saddr, __be16 new_sport)
2937 {
2938         struct xfrm_user_mapping *um;
2939         struct nlmsghdr *nlh;
2940 
2941         nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2942         if (nlh == NULL)
2943                 return -EMSGSIZE;
2944 
2945         um = nlmsg_data(nlh);
2946 
2947         memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2948         um->id.spi = x->id.spi;
2949         um->id.family = x->props.family;
2950         um->id.proto = x->id.proto;
2951         memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2952         memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2953         um->new_sport = new_sport;
2954         um->old_sport = x->encap->encap_sport;
2955         um->reqid = x->props.reqid;
2956 
2957         return nlmsg_end(skb, nlh);
2958 }
2959 
2960 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2961                              __be16 sport)
2962 {
2963         struct net *net = xs_net(x);
2964         struct sk_buff *skb;
2965 
2966         if (x->id.proto != IPPROTO_ESP)
2967                 return -EINVAL;
2968 
2969         if (!x->encap)
2970                 return -EINVAL;
2971 
2972         skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2973         if (skb == NULL)
2974                 return -ENOMEM;
2975 
2976         if (build_mapping(skb, x, ipaddr, sport) < 0)
2977                 BUG();
2978 
2979         return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
2980 }
2981 
2982 static bool xfrm_is_alive(const struct km_event *c)
2983 {
2984         return (bool)xfrm_acquire_is_on(c->net);
2985 }
2986 
2987 static struct xfrm_mgr netlink_mgr = {
2988         .id             = "netlink",
2989         .notify         = xfrm_send_state_notify,
2990         .acquire        = xfrm_send_acquire,
2991         .compile_policy = xfrm_compile_policy,
2992         .notify_policy  = xfrm_send_policy_notify,
2993         .report         = xfrm_send_report,
2994         .migrate        = xfrm_send_migrate,
2995         .new_mapping    = xfrm_send_mapping,
2996         .is_alive       = xfrm_is_alive,
2997 };
2998 
2999 static int __net_init xfrm_user_net_init(struct net *net)
3000 {
3001         struct sock *nlsk;
3002         struct netlink_kernel_cfg cfg = {
3003                 .groups = XFRMNLGRP_MAX,
3004                 .input  = xfrm_netlink_rcv,
3005         };
3006 
3007         nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3008         if (nlsk == NULL)
3009                 return -ENOMEM;
3010         net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3011         rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3012         return 0;
3013 }
3014 
3015 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3016 {
3017         struct net *net;
3018         list_for_each_entry(net, net_exit_list, exit_list)
3019                 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3020         synchronize_net();
3021         list_for_each_entry(net, net_exit_list, exit_list)
3022                 netlink_kernel_release(net->xfrm.nlsk_stash);
3023 }
3024 
3025 static struct pernet_operations xfrm_user_net_ops = {
3026         .init       = xfrm_user_net_init,
3027         .exit_batch = xfrm_user_net_exit,
3028 };
3029 
3030 static int __init xfrm_user_init(void)
3031 {
3032         int rv;
3033 
3034         printk(KERN_INFO "Initializing XFRM netlink socket\n");
3035 
3036         rv = register_pernet_subsys(&xfrm_user_net_ops);
3037         if (rv < 0)
3038                 return rv;
3039         rv = xfrm_register_km(&netlink_mgr);
3040         if (rv < 0)
3041                 unregister_pernet_subsys(&xfrm_user_net_ops);
3042         return rv;
3043 }
3044 
3045 static void __exit xfrm_user_exit(void)
3046 {
3047         xfrm_unregister_km(&netlink_mgr);
3048         unregister_pernet_subsys(&xfrm_user_net_ops);
3049 }
3050 
3051 module_init(xfrm_user_init);
3052 module_exit(xfrm_user_exit);
3053 MODULE_LICENSE("GPL");
3054 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3055 
3056 

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