net/xfrm/xfrm_state.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * xfrm_state.c
   4  *
   5  * Changes:
   6  *      Mitsuru KANDA @USAGI
   7  *      Kazunori MIYAZAWA @USAGI
   8  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   9  *              IPv6 support
  10  *      YOSHIFUJI Hideaki @USAGI
  11  *              Split up af-specific functions
  12  *      Derek Atkins <derek@ihtfp.com>
  13  *              Add UDP Encapsulation
  14  *
  15  */
  16
  17 #include <linux/workqueue.h>
  18 #include <net/xfrm.h>
  19 #include <linux/pfkeyv2.h>
  20 #include <linux/ipsec.h>
  21 #include <linux/module.h>
  22 #include <linux/cache.h>
  23 #include <linux/audit.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/ktime.h>
  26 #include <linux/slab.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/kernel.h>
  29
  30 #include <crypto/aead.h>
  31
  32 #include "xfrm_hash.h"
  33
  34 #define xfrm_state_deref_prot(table, net) \
  35         rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
  36
  37 static void xfrm_state_gc_task(struct work_struct *work);
  38
  39 /* Each xfrm_state may be linked to two tables:
  40
  41    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
  42    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
  43       destination/tunnel endpoint. (output)
  44  */
  45
  46 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  47 static struct kmem_cache *xfrm_state_cache __ro_after_init;
  48
  49 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
  50 static HLIST_HEAD(xfrm_state_gc_list);
  51
  52 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
  53 {
  54         return refcount_inc_not_zero(&x->refcnt);
  55 }
  56
  57 static inline unsigned int xfrm_dst_hash(struct net *net,
  58                                          const xfrm_address_t *daddr,
  59                                          const xfrm_address_t *saddr,
  60                                          u32 reqid,
  61                                          unsigned short family)
  62 {
  63         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  64 }
  65
  66 static inline unsigned int xfrm_src_hash(struct net *net,
  67                                          const xfrm_address_t *daddr,
  68                                          const xfrm_address_t *saddr,
  69                                          unsigned short family)
  70 {
  71         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  72 }
  73
  74 static inline unsigned int
  75 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
  76               __be32 spi, u8 proto, unsigned short family)
  77 {
  78         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  79 }
  80
  81 static unsigned int xfrm_seq_hash(struct net *net, u32 seq)
  82 {
  83         return __xfrm_seq_hash(seq, net->xfrm.state_hmask);
  84 }
  85
  86 static void xfrm_hash_transfer(struct hlist_head *list,
  87                                struct hlist_head *ndsttable,
  88                                struct hlist_head *nsrctable,
  89                                struct hlist_head *nspitable,
  90                                struct hlist_head *nseqtable,
  91                                unsigned int nhashmask)
  92 {
  93         struct hlist_node *tmp;
  94         struct xfrm_state *x;
  95
  96         hlist_for_each_entry_safe(x, tmp, list, bydst) {
  97                 unsigned int h;
  98
  99                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
 100                                     x->props.reqid, x->props.family,
 101                                     nhashmask);
 102                 hlist_add_head_rcu(&x->bydst, ndsttable + h);
 103
 104                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
 105                                     x->props.family,
 106                                     nhashmask);
 107                 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
 108
 109                 if (x->id.spi) {
 110                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
 111                                             x->id.proto, x->props.family,
 112                                             nhashmask);
 113                         hlist_add_head_rcu(&x->byspi, nspitable + h);
 114                 }
 115
 116                 if (x->km.seq) {
 117                         h = __xfrm_seq_hash(x->km.seq, nhashmask);
 118                         hlist_add_head_rcu(&x->byseq, nseqtable + h);
 119                 }
 120         }
 121 }
 122
 123 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 124 {
 125         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 126 }
 127
 128 static void xfrm_hash_resize(struct work_struct *work)
 129 {
 130         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 131         struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq;
 132         unsigned long nsize, osize;
 133         unsigned int nhashmask, ohashmask;
 134         int i;
 135
 136         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 137         ndst = xfrm_hash_alloc(nsize);
 138         if (!ndst)
 139                 return;
 140         nsrc = xfrm_hash_alloc(nsize);
 141         if (!nsrc) {
 142                 xfrm_hash_free(ndst, nsize);
 143                 return;
 144         }
 145         nspi = xfrm_hash_alloc(nsize);
 146         if (!nspi) {
 147                 xfrm_hash_free(ndst, nsize);
 148                 xfrm_hash_free(nsrc, nsize);
 149                 return;
 150         }
 151         nseq = xfrm_hash_alloc(nsize);
 152         if (!nseq) {
 153                 xfrm_hash_free(ndst, nsize);
 154                 xfrm_hash_free(nsrc, nsize);
 155                 xfrm_hash_free(nspi, nsize);
 156                 return;
 157         }
 158
 159         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 160         write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
 161
 162         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 163         odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
 164         for (i = net->xfrm.state_hmask; i >= 0; i--)
 165                 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask);
 166
 167         osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
 168         ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
 169         oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net);
 170         ohashmask = net->xfrm.state_hmask;
 171
 172         rcu_assign_pointer(net->xfrm.state_bydst, ndst);
 173         rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
 174         rcu_assign_pointer(net->xfrm.state_byspi, nspi);
 175         rcu_assign_pointer(net->xfrm.state_byseq, nseq);
 176         net->xfrm.state_hmask = nhashmask;
 177
 178         write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
 179         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 180
 181         osize = (ohashmask + 1) * sizeof(struct hlist_head);
 182
 183         synchronize_rcu();
 184
 185         xfrm_hash_free(odst, osize);
 186         xfrm_hash_free(osrc, osize);
 187         xfrm_hash_free(ospi, osize);
 188         xfrm_hash_free(oseq, osize);
 189 }
 190
 191 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
 192 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
 193
 194 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 195
 196 int __xfrm_state_delete(struct xfrm_state *x);
 197
 198 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 199 static bool km_is_alive(const struct km_event *c);
 200 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 201
 202 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 203 {
 204         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 205         int err = 0;
 206
 207         if (!afinfo)
 208                 return -EAFNOSUPPORT;
 209
 210 #define X(afi, T, name) do {                    \
 211                 WARN_ON((afi)->type_ ## name);  \
 212                 (afi)->type_ ## name = (T);     \
 213         } while (0)
 214
 215         switch (type->proto) {
 216         case IPPROTO_COMP:
 217                 X(afinfo, type, comp);
 218                 break;
 219         case IPPROTO_AH:
 220                 X(afinfo, type, ah);
 221                 break;
 222         case IPPROTO_ESP:
 223                 X(afinfo, type, esp);
 224                 break;
 225         case IPPROTO_IPIP:
 226                 X(afinfo, type, ipip);
 227                 break;
 228         case IPPROTO_DSTOPTS:
 229                 X(afinfo, type, dstopts);
 230                 break;
 231         case IPPROTO_ROUTING:
 232                 X(afinfo, type, routing);
 233                 break;
 234         case IPPROTO_IPV6:
 235                 X(afinfo, type, ipip6);
 236                 break;
 237         default:
 238                 WARN_ON(1);
 239                 err = -EPROTONOSUPPORT;
 240                 break;
 241         }
 242 #undef X
 243         rcu_read_unlock();
 244         return err;
 245 }
 246 EXPORT_SYMBOL(xfrm_register_type);
 247
 248 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 249 {
 250         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 251
 252         if (unlikely(afinfo == NULL))
 253                 return;
 254
 255 #define X(afi, T, name) do {                            \
 256                 WARN_ON((afi)->type_ ## name != (T));   \
 257                 (afi)->type_ ## name = NULL;            \
 258         } while (0)
 259
 260         switch (type->proto) {
 261         case IPPROTO_COMP:
 262                 X(afinfo, type, comp);
 263                 break;
 264         case IPPROTO_AH:
 265                 X(afinfo, type, ah);
 266                 break;
 267         case IPPROTO_ESP:
 268                 X(afinfo, type, esp);
 269                 break;
 270         case IPPROTO_IPIP:
 271                 X(afinfo, type, ipip);
 272                 break;
 273         case IPPROTO_DSTOPTS:
 274                 X(afinfo, type, dstopts);
 275                 break;
 276         case IPPROTO_ROUTING:
 277                 X(afinfo, type, routing);
 278                 break;
 279         case IPPROTO_IPV6:
 280                 X(afinfo, type, ipip6);
 281                 break;
 282         default:
 283                 WARN_ON(1);
 284                 break;
 285         }
 286 #undef X
 287         rcu_read_unlock();
 288 }
 289 EXPORT_SYMBOL(xfrm_unregister_type);
 290
 291 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 292 {
 293         const struct xfrm_type *type = NULL;
 294         struct xfrm_state_afinfo *afinfo;
 295         int modload_attempted = 0;
 296
 297 retry:
 298         afinfo = xfrm_state_get_afinfo(family);
 299         if (unlikely(afinfo == NULL))
 300                 return NULL;
 301
 302         switch (proto) {
 303         case IPPROTO_COMP:
 304                 type = afinfo->type_comp;
 305                 break;
 306         case IPPROTO_AH:
 307                 type = afinfo->type_ah;
 308                 break;
 309         case IPPROTO_ESP:
 310                 type = afinfo->type_esp;
 311                 break;
 312         case IPPROTO_IPIP:
 313                 type = afinfo->type_ipip;
 314                 break;
 315         case IPPROTO_DSTOPTS:
 316                 type = afinfo->type_dstopts;
 317                 break;
 318         case IPPROTO_ROUTING:
 319                 type = afinfo->type_routing;
 320                 break;
 321         case IPPROTO_IPV6:
 322                 type = afinfo->type_ipip6;
 323                 break;
 324         default:
 325                 break;
 326         }
 327
 328         if (unlikely(type && !try_module_get(type->owner)))
 329                 type = NULL;
 330
 331         rcu_read_unlock();
 332
 333         if (!type && !modload_attempted) {
 334                 request_module("xfrm-type-%d-%d", family, proto);
 335                 modload_attempted = 1;
 336                 goto retry;
 337         }
 338
 339         return type;
 340 }
 341
 342 static void xfrm_put_type(const struct xfrm_type *type)
 343 {
 344         module_put(type->owner);
 345 }
 346
 347 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
 348                                unsigned short family)
 349 {
 350         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 351         int err = 0;
 352
 353         if (unlikely(afinfo == NULL))
 354                 return -EAFNOSUPPORT;
 355
 356         switch (type->proto) {
 357         case IPPROTO_ESP:
 358                 WARN_ON(afinfo->type_offload_esp);
 359                 afinfo->type_offload_esp = type;
 360                 break;
 361         default:
 362                 WARN_ON(1);
 363                 err = -EPROTONOSUPPORT;
 364                 break;
 365         }
 366
 367         rcu_read_unlock();
 368         return err;
 369 }
 370 EXPORT_SYMBOL(xfrm_register_type_offload);
 371
 372 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
 373                                   unsigned short family)
 374 {
 375         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 376
 377         if (unlikely(afinfo == NULL))
 378                 return;
 379
 380         switch (type->proto) {
 381         case IPPROTO_ESP:
 382                 WARN_ON(afinfo->type_offload_esp != type);
 383                 afinfo->type_offload_esp = NULL;
 384                 break;
 385         default:
 386                 WARN_ON(1);
 387                 break;
 388         }
 389         rcu_read_unlock();
 390 }
 391 EXPORT_SYMBOL(xfrm_unregister_type_offload);
 392
 393 static const struct xfrm_type_offload *
 394 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
 395 {
 396         const struct xfrm_type_offload *type = NULL;
 397         struct xfrm_state_afinfo *afinfo;
 398
 399 retry:
 400         afinfo = xfrm_state_get_afinfo(family);
 401         if (unlikely(afinfo == NULL))
 402                 return NULL;
 403
 404         switch (proto) {
 405         case IPPROTO_ESP:
 406                 type = afinfo->type_offload_esp;
 407                 break;
 408         default:
 409                 break;
 410         }
 411
 412         if ((type && !try_module_get(type->owner)))
 413                 type = NULL;
 414
 415         rcu_read_unlock();
 416
 417         if (!type && try_load) {
 418                 request_module("xfrm-offload-%d-%d", family, proto);
 419                 try_load = false;
 420                 goto retry;
 421         }
 422
 423         return type;
 424 }
 425
 426 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
 427 {
 428         module_put(type->owner);
 429 }
 430
 431 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
 432         [XFRM_MODE_BEET] = {
 433                 .encap = XFRM_MODE_BEET,
 434                 .flags = XFRM_MODE_FLAG_TUNNEL,
 435                 .family = AF_INET,
 436         },
 437         [XFRM_MODE_TRANSPORT] = {
 438                 .encap = XFRM_MODE_TRANSPORT,
 439                 .family = AF_INET,
 440         },
 441         [XFRM_MODE_TUNNEL] = {
 442                 .encap = XFRM_MODE_TUNNEL,
 443                 .flags = XFRM_MODE_FLAG_TUNNEL,
 444                 .family = AF_INET,
 445         },
 446 };
 447
 448 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
 449         [XFRM_MODE_BEET] = {
 450                 .encap = XFRM_MODE_BEET,
 451                 .flags = XFRM_MODE_FLAG_TUNNEL,
 452                 .family = AF_INET6,
 453         },
 454         [XFRM_MODE_ROUTEOPTIMIZATION] = {
 455                 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
 456                 .family = AF_INET6,
 457         },
 458         [XFRM_MODE_TRANSPORT] = {
 459                 .encap = XFRM_MODE_TRANSPORT,
 460                 .family = AF_INET6,
 461         },
 462         [XFRM_MODE_TUNNEL] = {
 463                 .encap = XFRM_MODE_TUNNEL,
 464                 .flags = XFRM_MODE_FLAG_TUNNEL,
 465                 .family = AF_INET6,
 466         },
 467 };
 468
 469 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 470 {
 471         const struct xfrm_mode *mode;
 472
 473         if (unlikely(encap >= XFRM_MODE_MAX))
 474                 return NULL;
 475
 476         switch (family) {
 477         case AF_INET:
 478                 mode = &xfrm4_mode_map[encap];
 479                 if (mode->family == family)
 480                         return mode;
 481                 break;
 482         case AF_INET6:
 483                 mode = &xfrm6_mode_map[encap];
 484                 if (mode->family == family)
 485                         return mode;
 486                 break;
 487         default:
 488                 break;
 489         }
 490
 491         return NULL;
 492 }
 493
 494 void xfrm_state_free(struct xfrm_state *x)
 495 {
 496         kmem_cache_free(xfrm_state_cache, x);
 497 }
 498 EXPORT_SYMBOL(xfrm_state_free);
 499
 500 static void ___xfrm_state_destroy(struct xfrm_state *x)
 501 {
 502         hrtimer_cancel(&x->mtimer);
 503         del_timer_sync(&x->rtimer);
 504         kfree(x->aead);
 505         kfree(x->aalg);
 506         kfree(x->ealg);
 507         kfree(x->calg);
 508         kfree(x->encap);
 509         kfree(x->coaddr);
 510         kfree(x->replay_esn);
 511         kfree(x->preplay_esn);
 512         if (x->type_offload)
 513                 xfrm_put_type_offload(x->type_offload);
 514         if (x->type) {
 515                 x->type->destructor(x);
 516                 xfrm_put_type(x->type);
 517         }
 518         if (x->xfrag.page)
 519                 put_page(x->xfrag.page);
 520         xfrm_dev_state_free(x);
 521         security_xfrm_state_free(x);
 522         xfrm_state_free(x);
 523 }
 524
 525 static void xfrm_state_gc_task(struct work_struct *work)
 526 {
 527         struct xfrm_state *x;
 528         struct hlist_node *tmp;
 529         struct hlist_head gc_list;
 530
 531         spin_lock_bh(&xfrm_state_gc_lock);
 532         hlist_move_list(&xfrm_state_gc_list, &gc_list);
 533         spin_unlock_bh(&xfrm_state_gc_lock);
 534
 535         synchronize_rcu();
 536
 537         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
 538                 ___xfrm_state_destroy(x);
 539 }
 540
 541 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
 542 {
 543         struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
 544         enum hrtimer_restart ret = HRTIMER_NORESTART;
 545         time64_t now = ktime_get_real_seconds();
 546         time64_t next = TIME64_MAX;
 547         int warn = 0;
 548         int err = 0;
 549
 550         spin_lock(&x->lock);
 551         if (x->km.state == XFRM_STATE_DEAD)
 552                 goto out;
 553         if (x->km.state == XFRM_STATE_EXPIRED)
 554                 goto expired;
 555         if (x->lft.hard_add_expires_seconds) {
 556                 long tmo = x->lft.hard_add_expires_seconds +
 557                         x->curlft.add_time - now;
 558                 if (tmo <= 0) {
 559                         if (x->xflags & XFRM_SOFT_EXPIRE) {
 560                                 /* enter hard expire without soft expire first?!
 561                                  * setting a new date could trigger this.
 562                                  * workaround: fix x->curflt.add_time by below:
 563                                  */
 564                                 x->curlft.add_time = now - x->saved_tmo - 1;
 565                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 566                         } else
 567                                 goto expired;
 568                 }
 569                 if (tmo < next)
 570                         next = tmo;
 571         }
 572         if (x->lft.hard_use_expires_seconds) {
 573                 long tmo = x->lft.hard_use_expires_seconds +
 574                         (x->curlft.use_time ? : now) - now;
 575                 if (tmo <= 0)
 576                         goto expired;
 577                 if (tmo < next)
 578                         next = tmo;
 579         }
 580         if (x->km.dying)
 581                 goto resched;
 582         if (x->lft.soft_add_expires_seconds) {
 583                 long tmo = x->lft.soft_add_expires_seconds +
 584                         x->curlft.add_time - now;
 585                 if (tmo <= 0) {
 586                         warn = 1;
 587                         x->xflags &= ~XFRM_SOFT_EXPIRE;
 588                 } else if (tmo < next) {
 589                         next = tmo;
 590                         x->xflags |= XFRM_SOFT_EXPIRE;
 591                         x->saved_tmo = tmo;
 592                 }
 593         }
 594         if (x->lft.soft_use_expires_seconds) {
 595                 long tmo = x->lft.soft_use_expires_seconds +
 596                         (x->curlft.use_time ? : now) - now;
 597                 if (tmo <= 0)
 598                         warn = 1;
 599                 else if (tmo < next)
 600                         next = tmo;
 601         }
 602
 603         x->km.dying = warn;
 604         if (warn)
 605                 km_state_expired(x, 0, 0);
 606 resched:
 607         if (next != TIME64_MAX) {
 608                 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
 609                 ret = HRTIMER_RESTART;
 610         }
 611
 612         goto out;
 613
 614 expired:
 615         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
 616                 x->km.state = XFRM_STATE_EXPIRED;
 617
 618         err = __xfrm_state_delete(x);
 619         if (!err)
 620                 km_state_expired(x, 1, 0);
 621
 622         xfrm_audit_state_delete(x, err ? 0 : 1, true);
 623
 624 out:
 625         spin_unlock(&x->lock);
 626         return ret;
 627 }
 628
 629 static void xfrm_replay_timer_handler(struct timer_list *t);
 630
 631 struct xfrm_state *xfrm_state_alloc(struct net *net)
 632 {
 633         struct xfrm_state *x;
 634
 635         x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
 636
 637         if (x) {
 638                 write_pnet(&x->xs_net, net);
 639                 refcount_set(&x->refcnt, 1);
 640                 atomic_set(&x->tunnel_users, 0);
 641                 INIT_LIST_HEAD(&x->km.all);
 642                 INIT_HLIST_NODE(&x->bydst);
 643                 INIT_HLIST_NODE(&x->bysrc);
 644                 INIT_HLIST_NODE(&x->byspi);
 645                 INIT_HLIST_NODE(&x->byseq);
 646                 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
 647                 x->mtimer.function = xfrm_timer_handler;
 648                 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
 649                 x->curlft.add_time = ktime_get_real_seconds();
 650                 x->lft.soft_byte_limit = XFRM_INF;
 651                 x->lft.soft_packet_limit = XFRM_INF;
 652                 x->lft.hard_byte_limit = XFRM_INF;
 653                 x->lft.hard_packet_limit = XFRM_INF;
 654                 x->replay_maxage = 0;
 655                 x->replay_maxdiff = 0;
 656                 spin_lock_init(&x->lock);
 657         }
 658         return x;
 659 }
 660 EXPORT_SYMBOL(xfrm_state_alloc);
 661
 662 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
 663 {
 664         WARN_ON(x->km.state != XFRM_STATE_DEAD);
 665
 666         if (sync) {
 667                 synchronize_rcu();
 668                 ___xfrm_state_destroy(x);
 669         } else {
 670                 spin_lock_bh(&xfrm_state_gc_lock);
 671                 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
 672                 spin_unlock_bh(&xfrm_state_gc_lock);
 673                 schedule_work(&xfrm_state_gc_work);
 674         }
 675 }
 676 EXPORT_SYMBOL(__xfrm_state_destroy);
 677
 678 int __xfrm_state_delete(struct xfrm_state *x)
 679 {
 680         struct net *net = xs_net(x);
 681         int err = -ESRCH;
 682
 683         if (x->km.state != XFRM_STATE_DEAD) {
 684                 x->km.state = XFRM_STATE_DEAD;
 685                 spin_lock(&net->xfrm.xfrm_state_lock);
 686                 list_del(&x->km.all);
 687                 hlist_del_rcu(&x->bydst);
 688                 hlist_del_rcu(&x->bysrc);
 689                 if (x->km.seq)
 690                         hlist_del_rcu(&x->byseq);
 691                 if (x->id.spi)
 692                         hlist_del_rcu(&x->byspi);
 693                 net->xfrm.state_num--;
 694                 spin_unlock(&net->xfrm.xfrm_state_lock);
 695
 696                 if (x->encap_sk)
 697                         sock_put(rcu_dereference_raw(x->encap_sk));
 698
 699                 xfrm_dev_state_delete(x);
 700
 701                 /* All xfrm_state objects are created by xfrm_state_alloc.
 702                  * The xfrm_state_alloc call gives a reference, and that
 703                  * is what we are dropping here.
 704                  */
 705                 xfrm_state_put(x);
 706                 err = 0;
 707         }
 708
 709         return err;
 710 }
 711 EXPORT_SYMBOL(__xfrm_state_delete);
 712
 713 int xfrm_state_delete(struct xfrm_state *x)
 714 {
 715         int err;
 716
 717         spin_lock_bh(&x->lock);
 718         err = __xfrm_state_delete(x);
 719         spin_unlock_bh(&x->lock);
 720
 721         return err;
 722 }
 723 EXPORT_SYMBOL(xfrm_state_delete);
 724
 725 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 726 static inline int
 727 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 728 {
 729         int i, err = 0;
 730
 731         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 732                 struct xfrm_state *x;
 733
 734                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 735                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 736                            (err = security_xfrm_state_delete(x)) != 0) {
 737                                 xfrm_audit_state_delete(x, 0, task_valid);
 738                                 return err;
 739                         }
 740                 }
 741         }
 742
 743         return err;
 744 }
 745
 746 static inline int
 747 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 748 {
 749         int i, err = 0;
 750
 751         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 752                 struct xfrm_state *x;
 753                 struct xfrm_state_offload *xso;
 754
 755                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 756                         xso = &x->xso;
 757
 758                         if (xso->dev == dev &&
 759                            (err = security_xfrm_state_delete(x)) != 0) {
 760                                 xfrm_audit_state_delete(x, 0, task_valid);
 761                                 return err;
 762                         }
 763                 }
 764         }
 765
 766         return err;
 767 }
 768 #else
 769 static inline int
 770 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 771 {
 772         return 0;
 773 }
 774
 775 static inline int
 776 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 777 {
 778         return 0;
 779 }
 780 #endif
 781
 782 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
 783 {
 784         int i, err = 0, cnt = 0;
 785
 786         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 787         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
 788         if (err)
 789                 goto out;
 790
 791         err = -ESRCH;
 792         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 793                 struct xfrm_state *x;
 794 restart:
 795                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 796                         if (!xfrm_state_kern(x) &&
 797                             xfrm_id_proto_match(x->id.proto, proto)) {
 798                                 xfrm_state_hold(x);
 799                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 800
 801                                 err = xfrm_state_delete(x);
 802                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 803                                                         task_valid);
 804                                 if (sync)
 805                                         xfrm_state_put_sync(x);
 806                                 else
 807                                         xfrm_state_put(x);
 808                                 if (!err)
 809                                         cnt++;
 810
 811                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 812                                 goto restart;
 813                         }
 814                 }
 815         }
 816 out:
 817         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 818         if (cnt)
 819                 err = 0;
 820
 821         return err;
 822 }
 823 EXPORT_SYMBOL(xfrm_state_flush);
 824
 825 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
 826 {
 827         int i, err = 0, cnt = 0;
 828
 829         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 830         err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
 831         if (err)
 832                 goto out;
 833
 834         err = -ESRCH;
 835         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 836                 struct xfrm_state *x;
 837                 struct xfrm_state_offload *xso;
 838 restart:
 839                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 840                         xso = &x->xso;
 841
 842                         if (!xfrm_state_kern(x) && xso->dev == dev) {
 843                                 xfrm_state_hold(x);
 844                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 845
 846                                 err = xfrm_state_delete(x);
 847                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 848                                                         task_valid);
 849                                 xfrm_state_put(x);
 850                                 if (!err)
 851                                         cnt++;
 852
 853                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 854                                 goto restart;
 855                         }
 856                 }
 857         }
 858         if (cnt)
 859                 err = 0;
 860
 861 out:
 862         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 863         return err;
 864 }
 865 EXPORT_SYMBOL(xfrm_dev_state_flush);
 866
 867 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 868 {
 869         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 870         si->sadcnt = net->xfrm.state_num;
 871         si->sadhcnt = net->xfrm.state_hmask + 1;
 872         si->sadhmcnt = xfrm_state_hashmax;
 873         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 874 }
 875 EXPORT_SYMBOL(xfrm_sad_getinfo);
 876
 877 static void
 878 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 879 {
 880         const struct flowi4 *fl4 = &fl->u.ip4;
 881
 882         sel->daddr.a4 = fl4->daddr;
 883         sel->saddr.a4 = fl4->saddr;
 884         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
 885         sel->dport_mask = htons(0xffff);
 886         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
 887         sel->sport_mask = htons(0xffff);
 888         sel->family = AF_INET;
 889         sel->prefixlen_d = 32;
 890         sel->prefixlen_s = 32;
 891         sel->proto = fl4->flowi4_proto;
 892         sel->ifindex = fl4->flowi4_oif;
 893 }
 894
 895 static void
 896 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 897 {
 898         const struct flowi6 *fl6 = &fl->u.ip6;
 899
 900         /* Initialize temporary selector matching only to current session. */
 901         *(struct in6_addr *)&sel->daddr = fl6->daddr;
 902         *(struct in6_addr *)&sel->saddr = fl6->saddr;
 903         sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
 904         sel->dport_mask = htons(0xffff);
 905         sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
 906         sel->sport_mask = htons(0xffff);
 907         sel->family = AF_INET6;
 908         sel->prefixlen_d = 128;
 909         sel->prefixlen_s = 128;
 910         sel->proto = fl6->flowi6_proto;
 911         sel->ifindex = fl6->flowi6_oif;
 912 }
 913
 914 static void
 915 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 916                     const struct xfrm_tmpl *tmpl,
 917                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 918                     unsigned short family)
 919 {
 920         switch (family) {
 921         case AF_INET:
 922                 __xfrm4_init_tempsel(&x->sel, fl);
 923                 break;
 924         case AF_INET6:
 925                 __xfrm6_init_tempsel(&x->sel, fl);
 926                 break;
 927         }
 928
 929         x->id = tmpl->id;
 930
 931         switch (tmpl->encap_family) {
 932         case AF_INET:
 933                 if (x->id.daddr.a4 == 0)
 934                         x->id.daddr.a4 = daddr->a4;
 935                 x->props.saddr = tmpl->saddr;
 936                 if (x->props.saddr.a4 == 0)
 937                         x->props.saddr.a4 = saddr->a4;
 938                 break;
 939         case AF_INET6:
 940                 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
 941                         memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
 942                 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
 943                 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
 944                         memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
 945                 break;
 946         }
 947
 948         x->props.mode = tmpl->mode;
 949         x->props.reqid = tmpl->reqid;
 950         x->props.family = tmpl->encap_family;
 951 }
 952
 953 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
 954                                               const xfrm_address_t *daddr,
 955                                               __be32 spi, u8 proto,
 956                                               unsigned short family)
 957 {
 958         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 959         struct xfrm_state *x;
 960
 961         hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
 962                 if (x->props.family != family ||
 963                     x->id.spi       != spi ||
 964                     x->id.proto     != proto ||
 965                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
 966                         continue;
 967
 968                 if ((mark & x->mark.m) != x->mark.v)
 969                         continue;
 970                 if (!xfrm_state_hold_rcu(x))
 971                         continue;
 972                 return x;
 973         }
 974
 975         return NULL;
 976 }
 977
 978 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 979                                                      const xfrm_address_t *daddr,
 980                                                      const xfrm_address_t *saddr,
 981                                                      u8 proto, unsigned short family)
 982 {
 983         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 984         struct xfrm_state *x;
 985
 986         hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
 987                 if (x->props.family != family ||
 988                     x->id.proto     != proto ||
 989                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
 990                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
 991                         continue;
 992
 993                 if ((mark & x->mark.m) != x->mark.v)
 994                         continue;
 995                 if (!xfrm_state_hold_rcu(x))
 996                         continue;
 997                 return x;
 998         }
 999
1000         return NULL;
1001 }
1002
1003 static inline struct xfrm_state *
1004 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
1005 {
1006         struct net *net = xs_net(x);
1007         u32 mark = x->mark.v & x->mark.m;
1008
1009         if (use_spi)
1010                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
1011                                            x->id.spi, x->id.proto, family);
1012         else
1013                 return __xfrm_state_lookup_byaddr(net, mark,
1014                                                   &x->id.daddr,
1015                                                   &x->props.saddr,
1016                                                   x->id.proto, family);
1017 }
1018
1019 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
1020 {
1021         if (have_hash_collision &&
1022             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
1023             net->xfrm.state_num > net->xfrm.state_hmask)
1024                 schedule_work(&net->xfrm.state_hash_work);
1025 }
1026
1027 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1028                                const struct flowi *fl, unsigned short family,
1029                                struct xfrm_state **best, int *acq_in_progress,
1030                                int *error)
1031 {
1032         /* Resolution logic:
1033          * 1. There is a valid state with matching selector. Done.
1034          * 2. Valid state with inappropriate selector. Skip.
1035          *
1036          * Entering area of "sysdeps".
1037          *
1038          * 3. If state is not valid, selector is temporary, it selects
1039          *    only session which triggered previous resolution. Key
1040          *    manager will do something to install a state with proper
1041          *    selector.
1042          */
1043         if (x->km.state == XFRM_STATE_VALID) {
1044                 if ((x->sel.family &&
1045                      (x->sel.family != family ||
1046                       !xfrm_selector_match(&x->sel, fl, family))) ||
1047                     !security_xfrm_state_pol_flow_match(x, pol,
1048                                                         &fl->u.__fl_common))
1049                         return;
1050
1051                 if (!*best ||
1052                     (*best)->km.dying > x->km.dying ||
1053                     ((*best)->km.dying == x->km.dying &&
1054                      (*best)->curlft.add_time < x->curlft.add_time))
1055                         *best = x;
1056         } else if (x->km.state == XFRM_STATE_ACQ) {
1057                 *acq_in_progress = 1;
1058         } else if (x->km.state == XFRM_STATE_ERROR ||
1059                    x->km.state == XFRM_STATE_EXPIRED) {
1060                 if ((!x->sel.family ||
1061                      (x->sel.family == family &&
1062                       xfrm_selector_match(&x->sel, fl, family))) &&
1063                     security_xfrm_state_pol_flow_match(x, pol,
1064                                                        &fl->u.__fl_common))
1065                         *error = -ESRCH;
1066         }
1067 }
1068
1069 struct xfrm_state *
1070 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1071                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1072                 struct xfrm_policy *pol, int *err,
1073                 unsigned short family, u32 if_id)
1074 {
1075         static xfrm_address_t saddr_wildcard = { };
1076         struct net *net = xp_net(pol);
1077         unsigned int h, h_wildcard;
1078         struct xfrm_state *x, *x0, *to_put;
1079         int acquire_in_progress = 0;
1080         int error = 0;
1081         struct xfrm_state *best = NULL;
1082         u32 mark = pol->mark.v & pol->mark.m;
1083         unsigned short encap_family = tmpl->encap_family;
1084         unsigned int sequence;
1085         struct km_event c;
1086
1087         to_put = NULL;
1088
1089         sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
1090
1091         rcu_read_lock();
1092         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1093         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1094                 if (x->props.family == encap_family &&
1095                     x->props.reqid == tmpl->reqid &&
1096                     (mark & x->mark.m) == x->mark.v &&
1097                     x->if_id == if_id &&
1098                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1099                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1100                     tmpl->mode == x->props.mode &&
1101                     tmpl->id.proto == x->id.proto &&
1102                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1103                         xfrm_state_look_at(pol, x, fl, family,
1104                                            &best, &acquire_in_progress, &error);
1105         }
1106         if (best || acquire_in_progress)
1107                 goto found;
1108
1109         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1110         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1111                 if (x->props.family == encap_family &&
1112                     x->props.reqid == tmpl->reqid &&
1113                     (mark & x->mark.m) == x->mark.v &&
1114                     x->if_id == if_id &&
1115                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1116                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1117                     tmpl->mode == x->props.mode &&
1118                     tmpl->id.proto == x->id.proto &&
1119                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1120                         xfrm_state_look_at(pol, x, fl, family,
1121                                            &best, &acquire_in_progress, &error);
1122         }
1123
1124 found:
1125         x = best;
1126         if (!x && !error && !acquire_in_progress) {
1127                 if (tmpl->id.spi &&
1128                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
1129                                               tmpl->id.proto, encap_family)) != NULL) {
1130                         to_put = x0;
1131                         error = -EEXIST;
1132                         goto out;
1133                 }
1134
1135                 c.net = net;
1136                 /* If the KMs have no listeners (yet...), avoid allocating an SA
1137                  * for each and every packet - garbage collection might not
1138                  * handle the flood.
1139                  */
1140                 if (!km_is_alive(&c)) {
1141                         error = -ESRCH;
1142                         goto out;
1143                 }
1144
1145                 x = xfrm_state_alloc(net);
1146                 if (x == NULL) {
1147                         error = -ENOMEM;
1148                         goto out;
1149                 }
1150                 /* Initialize temporary state matching only
1151                  * to current session. */
1152                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1153                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1154                 x->if_id = if_id;
1155
1156                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1157                 if (error) {
1158                         x->km.state = XFRM_STATE_DEAD;
1159                         to_put = x;
1160                         x = NULL;
1161                         goto out;
1162                 }
1163
1164                 if (km_query(x, tmpl, pol) == 0) {
1165                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1166                         x->km.state = XFRM_STATE_ACQ;
1167                         list_add(&x->km.all, &net->xfrm.state_all);
1168                         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1169                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
1170                         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1171                         if (x->id.spi) {
1172                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1173                                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1174                         }
1175                         if (x->km.seq) {
1176                                 h = xfrm_seq_hash(net, x->km.seq);
1177                                 hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
1178                         }
1179                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1180                         hrtimer_start(&x->mtimer,
1181                                       ktime_set(net->xfrm.sysctl_acq_expires, 0),
1182                                       HRTIMER_MODE_REL_SOFT);
1183                         net->xfrm.state_num++;
1184                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1185                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1186                 } else {
1187                         x->km.state = XFRM_STATE_DEAD;
1188                         to_put = x;
1189                         x = NULL;
1190                         error = -ESRCH;
1191                 }
1192         }
1193 out:
1194         if (x) {
1195                 if (!xfrm_state_hold_rcu(x)) {
1196                         *err = -EAGAIN;
1197                         x = NULL;
1198                 }
1199         } else {
1200                 *err = acquire_in_progress ? -EAGAIN : error;
1201         }
1202         rcu_read_unlock();
1203         if (to_put)
1204                 xfrm_state_put(to_put);
1205
1206         if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
1207                 *err = -EAGAIN;
1208                 if (x) {
1209                         xfrm_state_put(x);
1210                         x = NULL;
1211                 }
1212         }
1213
1214         return x;
1215 }
1216
1217 struct xfrm_state *
1218 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1219                     xfrm_address_t *daddr, xfrm_address_t *saddr,
1220                     unsigned short family, u8 mode, u8 proto, u32 reqid)
1221 {
1222         unsigned int h;
1223         struct xfrm_state *rx = NULL, *x = NULL;
1224
1225         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1226         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1227         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1228                 if (x->props.family == family &&
1229                     x->props.reqid == reqid &&
1230                     (mark & x->mark.m) == x->mark.v &&
1231                     x->if_id == if_id &&
1232                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1233                     xfrm_state_addr_check(x, daddr, saddr, family) &&
1234                     mode == x->props.mode &&
1235                     proto == x->id.proto &&
1236                     x->km.state == XFRM_STATE_VALID) {
1237                         rx = x;
1238                         break;
1239                 }
1240         }
1241
1242         if (rx)
1243                 xfrm_state_hold(rx);
1244         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1245
1246
1247         return rx;
1248 }
1249 EXPORT_SYMBOL(xfrm_stateonly_find);
1250
1251 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1252                                               unsigned short family)
1253 {
1254         struct xfrm_state *x;
1255         struct xfrm_state_walk *w;
1256
1257         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1258         list_for_each_entry(w, &net->xfrm.state_all, all) {
1259                 x = container_of(w, struct xfrm_state, km);
1260                 if (x->props.family != family ||
1261                         x->id.spi != spi)
1262                         continue;
1263
1264                 xfrm_state_hold(x);
1265                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1266                 return x;
1267         }
1268         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1269         return NULL;
1270 }
1271 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1272
1273 static void __xfrm_state_insert(struct xfrm_state *x)
1274 {
1275         struct net *net = xs_net(x);
1276         unsigned int h;
1277
1278         list_add(&x->km.all, &net->xfrm.state_all);
1279
1280         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1281                           x->props.reqid, x->props.family);
1282         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1283
1284         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1285         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1286
1287         if (x->id.spi) {
1288                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1289                                   x->props.family);
1290
1291                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1292         }
1293
1294         if (x->km.seq) {
1295                 h = xfrm_seq_hash(net, x->km.seq);
1296
1297                 hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
1298         }
1299
1300         hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1301         if (x->replay_maxage)
1302                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1303
1304         net->xfrm.state_num++;
1305
1306         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1307 }
1308
1309 /* net->xfrm.xfrm_state_lock is held */
1310 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1311 {
1312         struct net *net = xs_net(xnew);
1313         unsigned short family = xnew->props.family;
1314         u32 reqid = xnew->props.reqid;
1315         struct xfrm_state *x;
1316         unsigned int h;
1317         u32 mark = xnew->mark.v & xnew->mark.m;
1318         u32 if_id = xnew->if_id;
1319
1320         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1321         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1322                 if (x->props.family     == family &&
1323                     x->props.reqid      == reqid &&
1324                     x->if_id            == if_id &&
1325                     (mark & x->mark.m) == x->mark.v &&
1326                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1327                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1328                         x->genid++;
1329         }
1330 }
1331
1332 void xfrm_state_insert(struct xfrm_state *x)
1333 {
1334         struct net *net = xs_net(x);
1335
1336         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1337         __xfrm_state_bump_genids(x);
1338         __xfrm_state_insert(x);
1339         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1340 }
1341 EXPORT_SYMBOL(xfrm_state_insert);
1342
1343 /* net->xfrm.xfrm_state_lock is held */
1344 static struct xfrm_state *__find_acq_core(struct net *net,
1345                                           const struct xfrm_mark *m,
1346                                           unsigned short family, u8 mode,
1347                                           u32 reqid, u32 if_id, u8 proto,
1348                                           const xfrm_address_t *daddr,
1349                                           const xfrm_address_t *saddr,
1350                                           int create)
1351 {
1352         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1353         struct xfrm_state *x;
1354         u32 mark = m->v & m->m;
1355
1356         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1357                 if (x->props.reqid  != reqid ||
1358                     x->props.mode   != mode ||
1359                     x->props.family != family ||
1360                     x->km.state     != XFRM_STATE_ACQ ||
1361                     x->id.spi       != 0 ||
1362                     x->id.proto     != proto ||
1363                     (mark & x->mark.m) != x->mark.v ||
1364                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1365                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1366                         continue;
1367
1368                 xfrm_state_hold(x);
1369                 return x;
1370         }
1371
1372         if (!create)
1373                 return NULL;
1374
1375         x = xfrm_state_alloc(net);
1376         if (likely(x)) {
1377                 switch (family) {
1378                 case AF_INET:
1379                         x->sel.daddr.a4 = daddr->a4;
1380                         x->sel.saddr.a4 = saddr->a4;
1381                         x->sel.prefixlen_d = 32;
1382                         x->sel.prefixlen_s = 32;
1383                         x->props.saddr.a4 = saddr->a4;
1384                         x->id.daddr.a4 = daddr->a4;
1385                         break;
1386
1387                 case AF_INET6:
1388                         x->sel.daddr.in6 = daddr->in6;
1389                         x->sel.saddr.in6 = saddr->in6;
1390                         x->sel.prefixlen_d = 128;
1391                         x->sel.prefixlen_s = 128;
1392                         x->props.saddr.in6 = saddr->in6;
1393                         x->id.daddr.in6 = daddr->in6;
1394                         break;
1395                 }
1396
1397                 x->km.state = XFRM_STATE_ACQ;
1398                 x->id.proto = proto;
1399                 x->props.family = family;
1400                 x->props.mode = mode;
1401                 x->props.reqid = reqid;
1402                 x->if_id = if_id;
1403                 x->mark.v = m->v;
1404                 x->mark.m = m->m;
1405                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1406                 xfrm_state_hold(x);
1407                 hrtimer_start(&x->mtimer,
1408                               ktime_set(net->xfrm.sysctl_acq_expires, 0),
1409                               HRTIMER_MODE_REL_SOFT);
1410                 list_add(&x->km.all, &net->xfrm.state_all);
1411                 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1412                 h = xfrm_src_hash(net, daddr, saddr, family);
1413                 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1414
1415                 net->xfrm.state_num++;
1416
1417                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1418         }
1419
1420         return x;
1421 }
1422
1423 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1424
1425 int xfrm_state_add(struct xfrm_state *x)
1426 {
1427         struct net *net = xs_net(x);
1428         struct xfrm_state *x1, *to_put;
1429         int family;
1430         int err;
1431         u32 mark = x->mark.v & x->mark.m;
1432         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1433
1434         family = x->props.family;
1435
1436         to_put = NULL;
1437
1438         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1439
1440         x1 = __xfrm_state_locate(x, use_spi, family);
1441         if (x1) {
1442                 to_put = x1;
1443                 x1 = NULL;
1444                 err = -EEXIST;
1445                 goto out;
1446         }
1447
1448         if (use_spi && x->km.seq) {
1449                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1450                 if (x1 && ((x1->id.proto != x->id.proto) ||
1451                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1452                         to_put = x1;
1453                         x1 = NULL;
1454                 }
1455         }
1456
1457         if (use_spi && !x1)
1458                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1459                                      x->props.reqid, x->if_id, x->id.proto,
1460                                      &x->id.daddr, &x->props.saddr, 0);
1461
1462         __xfrm_state_bump_genids(x);
1463         __xfrm_state_insert(x);
1464         err = 0;
1465
1466 out:
1467         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1468
1469         if (x1) {
1470                 xfrm_state_delete(x1);
1471                 xfrm_state_put(x1);
1472         }
1473
1474         if (to_put)
1475                 xfrm_state_put(to_put);
1476
1477         return err;
1478 }
1479 EXPORT_SYMBOL(xfrm_state_add);
1480
1481 #ifdef CONFIG_XFRM_MIGRATE
1482 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1483 {
1484         struct xfrm_user_sec_ctx *uctx;
1485         int size = sizeof(*uctx) + security->ctx_len;
1486         int err;
1487
1488         uctx = kmalloc(size, GFP_KERNEL);
1489         if (!uctx)
1490                 return -ENOMEM;
1491
1492         uctx->exttype = XFRMA_SEC_CTX;
1493         uctx->len = size;
1494         uctx->ctx_doi = security->ctx_doi;
1495         uctx->ctx_alg = security->ctx_alg;
1496         uctx->ctx_len = security->ctx_len;
1497         memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1498         err = security_xfrm_state_alloc(x, uctx);
1499         kfree(uctx);
1500         if (err)
1501                 return err;
1502
1503         return 0;
1504 }
1505
1506 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1507                                            struct xfrm_encap_tmpl *encap)
1508 {
1509         struct net *net = xs_net(orig);
1510         struct xfrm_state *x = xfrm_state_alloc(net);
1511         if (!x)
1512                 goto out;
1513
1514         memcpy(&x->id, &orig->id, sizeof(x->id));
1515         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1516         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1517         x->props.mode = orig->props.mode;
1518         x->props.replay_window = orig->props.replay_window;
1519         x->props.reqid = orig->props.reqid;
1520         x->props.family = orig->props.family;
1521         x->props.saddr = orig->props.saddr;
1522
1523         if (orig->aalg) {
1524                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1525                 if (!x->aalg)
1526                         goto error;
1527         }
1528         x->props.aalgo = orig->props.aalgo;
1529
1530         if (orig->aead) {
1531                 x->aead = xfrm_algo_aead_clone(orig->aead);
1532                 x->geniv = orig->geniv;
1533                 if (!x->aead)
1534                         goto error;
1535         }
1536         if (orig->ealg) {
1537                 x->ealg = xfrm_algo_clone(orig->ealg);
1538                 if (!x->ealg)
1539                         goto error;
1540         }
1541         x->props.ealgo = orig->props.ealgo;
1542
1543         if (orig->calg) {
1544                 x->calg = xfrm_algo_clone(orig->calg);
1545                 if (!x->calg)
1546                         goto error;
1547         }
1548         x->props.calgo = orig->props.calgo;
1549
1550         if (encap || orig->encap) {
1551                 if (encap)
1552                         x->encap = kmemdup(encap, sizeof(*x->encap),
1553                                         GFP_KERNEL);
1554                 else
1555                         x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1556                                         GFP_KERNEL);
1557
1558                 if (!x->encap)
1559                         goto error;
1560         }
1561
1562         if (orig->security)
1563                 if (clone_security(x, orig->security))
1564                         goto error;
1565
1566         if (orig->coaddr) {
1567                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1568                                     GFP_KERNEL);
1569                 if (!x->coaddr)
1570                         goto error;
1571         }
1572
1573         if (orig->replay_esn) {
1574                 if (xfrm_replay_clone(x, orig))
1575                         goto error;
1576         }
1577
1578         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1579         memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1580
1581         if (xfrm_init_state(x) < 0)
1582                 goto error;
1583
1584         x->props.flags = orig->props.flags;
1585         x->props.extra_flags = orig->props.extra_flags;
1586
1587         x->if_id = orig->if_id;
1588         x->tfcpad = orig->tfcpad;
1589         x->replay_maxdiff = orig->replay_maxdiff;
1590         x->replay_maxage = orig->replay_maxage;
1591         memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1592         x->km.state = orig->km.state;
1593         x->km.seq = orig->km.seq;
1594         x->replay = orig->replay;
1595         x->preplay = orig->preplay;
1596
1597         return x;
1598
1599  error:
1600         xfrm_state_put(x);
1601 out:
1602         return NULL;
1603 }
1604
1605 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1606 {
1607         unsigned int h;
1608         struct xfrm_state *x = NULL;
1609
1610         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1611
1612         if (m->reqid) {
1613                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1614                                   m->reqid, m->old_family);
1615                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1616                         if (x->props.mode != m->mode ||
1617                             x->id.proto != m->proto)
1618                                 continue;
1619                         if (m->reqid && x->props.reqid != m->reqid)
1620                                 continue;
1621                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1622                                              m->old_family) ||
1623                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1624                                              m->old_family))
1625                                 continue;
1626                         xfrm_state_hold(x);
1627                         break;
1628                 }
1629         } else {
1630                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1631                                   m->old_family);
1632                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1633                         if (x->props.mode != m->mode ||
1634                             x->id.proto != m->proto)
1635                                 continue;
1636                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1637                                              m->old_family) ||
1638                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1639                                              m->old_family))
1640                                 continue;
1641                         xfrm_state_hold(x);
1642                         break;
1643                 }
1644         }
1645
1646         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1647
1648         return x;
1649 }
1650 EXPORT_SYMBOL(xfrm_migrate_state_find);
1651
1652 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1653                                       struct xfrm_migrate *m,
1654                                       struct xfrm_encap_tmpl *encap)
1655 {
1656         struct xfrm_state *xc;
1657
1658         xc = xfrm_state_clone(x, encap);
1659         if (!xc)
1660                 return NULL;
1661
1662         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1663         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1664
1665         /* add state */
1666         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1667                 /* a care is needed when the destination address of the
1668                    state is to be updated as it is a part of triplet */
1669                 xfrm_state_insert(xc);
1670         } else {
1671                 if (xfrm_state_add(xc) < 0)
1672                         goto error;
1673         }
1674
1675         return xc;
1676 error:
1677         xfrm_state_put(xc);
1678         return NULL;
1679 }
1680 EXPORT_SYMBOL(xfrm_state_migrate);
1681 #endif
1682
1683 int xfrm_state_update(struct xfrm_state *x)
1684 {
1685         struct xfrm_state *x1, *to_put;
1686         int err;
1687         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1688         struct net *net = xs_net(x);
1689
1690         to_put = NULL;
1691
1692         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1693         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1694
1695         err = -ESRCH;
1696         if (!x1)
1697                 goto out;
1698
1699         if (xfrm_state_kern(x1)) {
1700                 to_put = x1;
1701                 err = -EEXIST;
1702                 goto out;
1703         }
1704
1705         if (x1->km.state == XFRM_STATE_ACQ) {
1706                 __xfrm_state_insert(x);
1707                 x = NULL;
1708         }
1709         err = 0;
1710
1711 out:
1712         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1713
1714         if (to_put)
1715                 xfrm_state_put(to_put);
1716
1717         if (err)
1718                 return err;
1719
1720         if (!x) {
1721                 xfrm_state_delete(x1);
1722                 xfrm_state_put(x1);
1723                 return 0;
1724         }
1725
1726         err = -EINVAL;
1727         spin_lock_bh(&x1->lock);
1728         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1729                 if (x->encap && x1->encap &&
1730                     x->encap->encap_type == x1->encap->encap_type)
1731                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1732                 else if (x->encap || x1->encap)
1733                         goto fail;
1734
1735                 if (x->coaddr && x1->coaddr) {
1736                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1737                 }
1738                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1739                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1740                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1741                 x1->km.dying = 0;
1742
1743                 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1744                               HRTIMER_MODE_REL_SOFT);
1745                 if (x1->curlft.use_time)
1746                         xfrm_state_check_expire(x1);
1747
1748                 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1749                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1750
1751                         if (x->props.smark.m || x->props.smark.v)
1752                                 x1->props.smark = x->props.smark;
1753
1754                         if (x->if_id)
1755                                 x1->if_id = x->if_id;
1756
1757                         __xfrm_state_bump_genids(x1);
1758                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1759                 }
1760
1761                 err = 0;
1762                 x->km.state = XFRM_STATE_DEAD;
1763                 __xfrm_state_put(x);
1764         }
1765
1766 fail:
1767         spin_unlock_bh(&x1->lock);
1768
1769         xfrm_state_put(x1);
1770
1771         return err;
1772 }
1773 EXPORT_SYMBOL(xfrm_state_update);
1774
1775 int xfrm_state_check_expire(struct xfrm_state *x)
1776 {
1777         if (!x->curlft.use_time)
1778                 x->curlft.use_time = ktime_get_real_seconds();
1779
1780         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1781             x->curlft.packets >= x->lft.hard_packet_limit) {
1782                 x->km.state = XFRM_STATE_EXPIRED;
1783                 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1784                 return -EINVAL;
1785         }
1786
1787         if (!x->km.dying &&
1788             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1789              x->curlft.packets >= x->lft.soft_packet_limit)) {
1790                 x->km.dying = 1;
1791                 km_state_expired(x, 0, 0);
1792         }
1793         return 0;
1794 }
1795 EXPORT_SYMBOL(xfrm_state_check_expire);
1796
1797 struct xfrm_state *
1798 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1799                   u8 proto, unsigned short family)
1800 {
1801         struct xfrm_state *x;
1802
1803         rcu_read_lock();
1804         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1805         rcu_read_unlock();
1806         return x;
1807 }
1808 EXPORT_SYMBOL(xfrm_state_lookup);
1809
1810 struct xfrm_state *
1811 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1812                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1813                          u8 proto, unsigned short family)
1814 {
1815         struct xfrm_state *x;
1816
1817         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1818         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1819         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1820         return x;
1821 }
1822 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1823
1824 struct xfrm_state *
1825 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1826               u32 if_id, u8 proto, const xfrm_address_t *daddr,
1827               const xfrm_address_t *saddr, int create, unsigned short family)
1828 {
1829         struct xfrm_state *x;
1830
1831         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1832         x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1833         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1834
1835         return x;
1836 }
1837 EXPORT_SYMBOL(xfrm_find_acq);
1838
1839 #ifdef CONFIG_XFRM_SUB_POLICY
1840 #if IS_ENABLED(CONFIG_IPV6)
1841 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1842 static void
1843 __xfrm6_sort(void **dst, void **src, int n,
1844              int (*cmp)(const void *p), int maxclass)
1845 {
1846         int count[XFRM_MAX_DEPTH] = { };
1847         int class[XFRM_MAX_DEPTH];
1848         int i;
1849
1850         for (i = 0; i < n; i++) {
1851                 int c = cmp(src[i]);
1852
1853                 class[i] = c;
1854                 count[c]++;
1855         }
1856
1857         for (i = 2; i < maxclass; i++)
1858                 count[i] += count[i - 1];
1859
1860         for (i = 0; i < n; i++) {
1861                 dst[count[class[i] - 1]++] = src[i];
1862                 src[i] = NULL;
1863         }
1864 }
1865
1866 /* Rule for xfrm_state:
1867  *
1868  * rule 1: select IPsec transport except AH
1869  * rule 2: select MIPv6 RO or inbound trigger
1870  * rule 3: select IPsec transport AH
1871  * rule 4: select IPsec tunnel
1872  * rule 5: others
1873  */
1874 static int __xfrm6_state_sort_cmp(const void *p)
1875 {
1876         const struct xfrm_state *v = p;
1877
1878         switch (v->props.mode) {
1879         case XFRM_MODE_TRANSPORT:
1880                 if (v->id.proto != IPPROTO_AH)
1881                         return 1;
1882                 else
1883                         return 3;
1884 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1885         case XFRM_MODE_ROUTEOPTIMIZATION:
1886         case XFRM_MODE_IN_TRIGGER:
1887                 return 2;
1888 #endif
1889         case XFRM_MODE_TUNNEL:
1890         case XFRM_MODE_BEET:
1891                 return 4;
1892         }
1893         return 5;
1894 }
1895
1896 /* Rule for xfrm_tmpl:
1897  *
1898  * rule 1: select IPsec transport
1899  * rule 2: select MIPv6 RO or inbound trigger
1900  * rule 3: select IPsec tunnel
1901  * rule 4: others
1902  */
1903 static int __xfrm6_tmpl_sort_cmp(const void *p)
1904 {
1905         const struct xfrm_tmpl *v = p;
1906
1907         switch (v->mode) {
1908         case XFRM_MODE_TRANSPORT:
1909                 return 1;
1910 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1911         case XFRM_MODE_ROUTEOPTIMIZATION:
1912         case XFRM_MODE_IN_TRIGGER:
1913                 return 2;
1914 #endif
1915         case XFRM_MODE_TUNNEL:
1916         case XFRM_MODE_BEET:
1917                 return 3;
1918         }
1919         return 4;
1920 }
1921 #else
1922 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
1923 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1924
1925 static inline void
1926 __xfrm6_sort(void **dst, void **src, int n,
1927              int (*cmp)(const void *p), int maxclass)
1928 {
1929         int i;
1930
1931         for (i = 0; i < n; i++)
1932                 dst[i] = src[i];
1933 }
1934 #endif /* CONFIG_IPV6 */
1935
1936 void
1937 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1938                unsigned short family)
1939 {
1940         int i;
1941
1942         if (family == AF_INET6)
1943                 __xfrm6_sort((void **)dst, (void **)src, n,
1944                              __xfrm6_tmpl_sort_cmp, 5);
1945         else
1946                 for (i = 0; i < n; i++)
1947                         dst[i] = src[i];
1948 }
1949
1950 void
1951 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1952                 unsigned short family)
1953 {
1954         int i;
1955
1956         if (family == AF_INET6)
1957                 __xfrm6_sort((void **)dst, (void **)src, n,
1958                              __xfrm6_state_sort_cmp, 6);
1959         else
1960                 for (i = 0; i < n; i++)
1961                         dst[i] = src[i];
1962 }
1963 #endif
1964
1965 /* Silly enough, but I'm lazy to build resolution list */
1966
1967 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1968 {
1969         unsigned int h = xfrm_seq_hash(net, seq);
1970         struct xfrm_state *x;
1971
1972         hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
1973                 if (x->km.seq == seq &&
1974                     (mark & x->mark.m) == x->mark.v &&
1975                     x->km.state == XFRM_STATE_ACQ) {
1976                         xfrm_state_hold(x);
1977                         return x;
1978                 }
1979         }
1980
1981         return NULL;
1982 }
1983
1984 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1985 {
1986         struct xfrm_state *x;
1987
1988         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1989         x = __xfrm_find_acq_byseq(net, mark, seq);
1990         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1991         return x;
1992 }
1993 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1994
1995 u32 xfrm_get_acqseq(void)
1996 {
1997         u32 res;
1998         static atomic_t acqseq;
1999
2000         do {
2001                 res = atomic_inc_return(&acqseq);
2002         } while (!res);
2003
2004         return res;
2005 }
2006 EXPORT_SYMBOL(xfrm_get_acqseq);
2007
2008 int verify_spi_info(u8 proto, u32 min, u32 max)
2009 {
2010         switch (proto) {
2011         case IPPROTO_AH:
2012         case IPPROTO_ESP:
2013                 break;
2014
2015         case IPPROTO_COMP:
2016                 /* IPCOMP spi is 16-bits. */
2017                 if (max >= 0x10000)
2018                         return -EINVAL;
2019                 break;
2020
2021         default:
2022                 return -EINVAL;
2023         }
2024
2025         if (min > max)
2026                 return -EINVAL;
2027
2028         return 0;
2029 }
2030 EXPORT_SYMBOL(verify_spi_info);
2031
2032 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
2033 {
2034         struct net *net = xs_net(x);
2035         unsigned int h;
2036         struct xfrm_state *x0;
2037         int err = -ENOENT;
2038         __be32 minspi = htonl(low);
2039         __be32 maxspi = htonl(high);
2040         __be32 newspi = 0;
2041         u32 mark = x->mark.v & x->mark.m;
2042
2043         spin_lock_bh(&x->lock);
2044         if (x->km.state == XFRM_STATE_DEAD)
2045                 goto unlock;
2046
2047         err = 0;
2048         if (x->id.spi)
2049                 goto unlock;
2050
2051         err = -ENOENT;
2052
2053         if (minspi == maxspi) {
2054                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2055                 if (x0) {
2056                         xfrm_state_put(x0);
2057                         goto unlock;
2058                 }
2059                 newspi = minspi;
2060         } else {
2061                 u32 spi = 0;
2062                 for (h = 0; h < high-low+1; h++) {
2063                         spi = low + prandom_u32()%(high-low+1);
2064                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2065                         if (x0 == NULL) {
2066                                 newspi = htonl(spi);
2067                                 break;
2068                         }
2069                         xfrm_state_put(x0);
2070                 }
2071         }
2072         if (newspi) {
2073                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2074                 x->id.spi = newspi;
2075                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2076                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2077                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2078
2079                 err = 0;
2080         }
2081
2082 unlock:
2083         spin_unlock_bh(&x->lock);
2084
2085         return err;
2086 }
2087 EXPORT_SYMBOL(xfrm_alloc_spi);
2088
2089 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2090                                       struct xfrm_address_filter *filter)
2091 {
2092         if (filter) {
2093                 if ((filter->family == AF_INET ||
2094                      filter->family == AF_INET6) &&
2095                     x->props.family != filter->family)
2096                         return false;
2097
2098                 return addr_match(&x->props.saddr, &filter->saddr,
2099                                   filter->splen) &&
2100                        addr_match(&x->id.daddr, &filter->daddr,
2101                                   filter->dplen);
2102         }
2103         return true;
2104 }
2105
2106 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2107                     int (*func)(struct xfrm_state *, int, void*),
2108                     void *data)
2109 {
2110         struct xfrm_state *state;
2111         struct xfrm_state_walk *x;
2112         int err = 0;
2113
2114         if (walk->seq != 0 && list_empty(&walk->all))
2115                 return 0;
2116
2117         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2118         if (list_empty(&walk->all))
2119                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2120         else
2121                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2122         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2123                 if (x->state == XFRM_STATE_DEAD)
2124                         continue;
2125                 state = container_of(x, struct xfrm_state, km);
2126                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2127                         continue;
2128                 if (!__xfrm_state_filter_match(state, walk->filter))
2129                         continue;
2130                 err = func(state, walk->seq, data);
2131                 if (err) {
2132                         list_move_tail(&walk->all, &x->all);
2133                         goto out;
2134                 }
2135                 walk->seq++;
2136         }
2137         if (walk->seq == 0) {
2138                 err = -ENOENT;
2139                 goto out;
2140         }
2141         list_del_init(&walk->all);
2142 out:
2143         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2144         return err;
2145 }
2146 EXPORT_SYMBOL(xfrm_state_walk);
2147
2148 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2149                           struct xfrm_address_filter *filter)
2150 {
2151         INIT_LIST_HEAD(&walk->all);
2152         walk->proto = proto;
2153         walk->state = XFRM_STATE_DEAD;
2154         walk->seq = 0;
2155         walk->filter = filter;
2156 }
2157 EXPORT_SYMBOL(xfrm_state_walk_init);
2158
2159 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2160 {
2161         kfree(walk->filter);
2162
2163         if (list_empty(&walk->all))
2164                 return;
2165
2166         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2167         list_del(&walk->all);
2168         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2169 }
2170 EXPORT_SYMBOL(xfrm_state_walk_done);
2171
2172 static void xfrm_replay_timer_handler(struct timer_list *t)
2173 {
2174         struct xfrm_state *x = from_timer(x, t, rtimer);
2175
2176         spin_lock(&x->lock);
2177
2178         if (x->km.state == XFRM_STATE_VALID) {
2179                 if (xfrm_aevent_is_on(xs_net(x)))
2180                         xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
2181                 else
2182                         x->xflags |= XFRM_TIME_DEFER;
2183         }
2184
2185         spin_unlock(&x->lock);
2186 }
2187
2188 static LIST_HEAD(xfrm_km_list);
2189
2190 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2191 {
2192         struct xfrm_mgr *km;
2193
2194         rcu_read_lock();
2195         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2196                 if (km->notify_policy)
2197                         km->notify_policy(xp, dir, c);
2198         rcu_read_unlock();
2199 }
2200
2201 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2202 {
2203         struct xfrm_mgr *km;
2204         rcu_read_lock();
2205         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2206                 if (km->notify)
2207                         km->notify(x, c);
2208         rcu_read_unlock();
2209 }
2210
2211 EXPORT_SYMBOL(km_policy_notify);
2212 EXPORT_SYMBOL(km_state_notify);
2213
2214 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2215 {
2216         struct km_event c;
2217
2218         c.data.hard = hard;
2219         c.portid = portid;
2220         c.event = XFRM_MSG_EXPIRE;
2221         km_state_notify(x, &c);
2222 }
2223
2224 EXPORT_SYMBOL(km_state_expired);
2225 /*
2226  * We send to all registered managers regardless of failure
2227  * We are happy with one success
2228 */
2229 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2230 {
2231         int err = -EINVAL, acqret;
2232         struct xfrm_mgr *km;
2233
2234         rcu_read_lock();
2235         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2236                 acqret = km->acquire(x, t, pol);
2237                 if (!acqret)
2238                         err = acqret;
2239         }
2240         rcu_read_unlock();
2241         return err;
2242 }
2243 EXPORT_SYMBOL(km_query);
2244
2245 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2246 {
2247         int err = -EINVAL;
2248         struct xfrm_mgr *km;
2249
2250         rcu_read_lock();
2251         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2252                 if (km->new_mapping)
2253                         err = km->new_mapping(x, ipaddr, sport);
2254                 if (!err)
2255                         break;
2256         }
2257         rcu_read_unlock();
2258         return err;
2259 }
2260 EXPORT_SYMBOL(km_new_mapping);
2261
2262 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2263 {
2264         struct km_event c;
2265
2266         c.data.hard = hard;
2267         c.portid = portid;
2268         c.event = XFRM_MSG_POLEXPIRE;
2269         km_policy_notify(pol, dir, &c);
2270 }
2271 EXPORT_SYMBOL(km_policy_expired);
2272
2273 #ifdef CONFIG_XFRM_MIGRATE
2274 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2275                const struct xfrm_migrate *m, int num_migrate,
2276                const struct xfrm_kmaddress *k,
2277                const struct xfrm_encap_tmpl *encap)
2278 {
2279         int err = -EINVAL;
2280         int ret;
2281         struct xfrm_mgr *km;
2282
2283         rcu_read_lock();
2284         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2285                 if (km->migrate) {
2286                         ret = km->migrate(sel, dir, type, m, num_migrate, k,
2287                                           encap);
2288                         if (!ret)
2289                                 err = ret;
2290                 }
2291         }
2292         rcu_read_unlock();
2293         return err;
2294 }
2295 EXPORT_SYMBOL(km_migrate);
2296 #endif
2297
2298 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2299 {
2300         int err = -EINVAL;
2301         int ret;
2302         struct xfrm_mgr *km;
2303
2304         rcu_read_lock();
2305         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2306                 if (km->report) {
2307                         ret = km->report(net, proto, sel, addr);
2308                         if (!ret)
2309                                 err = ret;
2310                 }
2311         }
2312         rcu_read_unlock();
2313         return err;
2314 }
2315 EXPORT_SYMBOL(km_report);
2316
2317 static bool km_is_alive(const struct km_event *c)
2318 {
2319         struct xfrm_mgr *km;
2320         bool is_alive = false;
2321
2322         rcu_read_lock();
2323         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2324                 if (km->is_alive && km->is_alive(c)) {
2325                         is_alive = true;
2326                         break;
2327                 }
2328         }
2329         rcu_read_unlock();
2330
2331         return is_alive;
2332 }
2333
2334 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2335 static DEFINE_SPINLOCK(xfrm_translator_lock);
2336 static struct xfrm_translator __rcu *xfrm_translator;
2337
2338 struct xfrm_translator *xfrm_get_translator(void)
2339 {
2340         struct xfrm_translator *xtr;
2341
2342         rcu_read_lock();
2343         xtr = rcu_dereference(xfrm_translator);
2344         if (unlikely(!xtr))
2345                 goto out;
2346         if (!try_module_get(xtr->owner))
2347                 xtr = NULL;
2348 out:
2349         rcu_read_unlock();
2350         return xtr;
2351 }
2352 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2353
2354 void xfrm_put_translator(struct xfrm_translator *xtr)
2355 {
2356         module_put(xtr->owner);
2357 }
2358 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2359
2360 int xfrm_register_translator(struct xfrm_translator *xtr)
2361 {
2362         int err = 0;
2363
2364         spin_lock_bh(&xfrm_translator_lock);
2365         if (unlikely(xfrm_translator != NULL))
2366                 err = -EEXIST;
2367         else
2368                 rcu_assign_pointer(xfrm_translator, xtr);
2369         spin_unlock_bh(&xfrm_translator_lock);
2370
2371         return err;
2372 }
2373 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2374
2375 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2376 {
2377         int err = 0;
2378
2379         spin_lock_bh(&xfrm_translator_lock);
2380         if (likely(xfrm_translator != NULL)) {
2381                 if (rcu_access_pointer(xfrm_translator) != xtr)
2382                         err = -EINVAL;
2383                 else
2384                         RCU_INIT_POINTER(xfrm_translator, NULL);
2385         }
2386         spin_unlock_bh(&xfrm_translator_lock);
2387         synchronize_rcu();
2388
2389         return err;
2390 }
2391 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2392 #endif
2393
2394 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2395 {
2396         int err;
2397         u8 *data;
2398         struct xfrm_mgr *km;
2399         struct xfrm_policy *pol = NULL;
2400
2401         if (sockptr_is_null(optval) && !optlen) {
2402                 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2403                 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2404                 __sk_dst_reset(sk);
2405                 return 0;
2406         }
2407
2408         if (optlen <= 0 || optlen > PAGE_SIZE)
2409                 return -EMSGSIZE;
2410
2411         data = memdup_sockptr(optval, optlen);
2412         if (IS_ERR(data))
2413                 return PTR_ERR(data);
2414
2415         if (in_compat_syscall()) {
2416                 struct xfrm_translator *xtr = xfrm_get_translator();
2417
2418                 if (!xtr) {
2419                         kfree(data);
2420                         return -EOPNOTSUPP;
2421                 }
2422
2423                 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2424                 xfrm_put_translator(xtr);
2425                 if (err) {
2426                         kfree(data);
2427                         return err;
2428                 }
2429         }
2430
2431         err = -EINVAL;
2432         rcu_read_lock();
2433         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2434                 pol = km->compile_policy(sk, optname, data,
2435                                          optlen, &err);
2436                 if (err >= 0)
2437                         break;
2438         }
2439         rcu_read_unlock();
2440
2441         if (err >= 0) {
2442                 xfrm_sk_policy_insert(sk, err, pol);
2443                 xfrm_pol_put(pol);
2444                 __sk_dst_reset(sk);
2445                 err = 0;
2446         }
2447
2448         kfree(data);
2449         return err;
2450 }
2451 EXPORT_SYMBOL(xfrm_user_policy);
2452
2453 static DEFINE_SPINLOCK(xfrm_km_lock);
2454
2455 int xfrm_register_km(struct xfrm_mgr *km)
2456 {
2457         spin_lock_bh(&xfrm_km_lock);
2458         list_add_tail_rcu(&km->list, &xfrm_km_list);
2459         spin_unlock_bh(&xfrm_km_lock);
2460         return 0;
2461 }
2462 EXPORT_SYMBOL(xfrm_register_km);
2463
2464 int xfrm_unregister_km(struct xfrm_mgr *km)
2465 {
2466         spin_lock_bh(&xfrm_km_lock);
2467         list_del_rcu(&km->list);
2468         spin_unlock_bh(&xfrm_km_lock);
2469         synchronize_rcu();
2470         return 0;
2471 }
2472 EXPORT_SYMBOL(xfrm_unregister_km);
2473
2474 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2475 {
2476         int err = 0;
2477
2478         if (WARN_ON(afinfo->family >= NPROTO))
2479                 return -EAFNOSUPPORT;
2480
2481         spin_lock_bh(&xfrm_state_afinfo_lock);
2482         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2483                 err = -EEXIST;
2484         else
2485                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2486         spin_unlock_bh(&xfrm_state_afinfo_lock);
2487         return err;
2488 }
2489 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2490
2491 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2492 {
2493         int err = 0, family = afinfo->family;
2494
2495         if (WARN_ON(family >= NPROTO))
2496                 return -EAFNOSUPPORT;
2497
2498         spin_lock_bh(&xfrm_state_afinfo_lock);
2499         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2500                 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2501                         err = -EINVAL;
2502                 else
2503                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2504         }
2505         spin_unlock_bh(&xfrm_state_afinfo_lock);
2506         synchronize_rcu();
2507         return err;
2508 }
2509 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2510
2511 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2512 {
2513         if (unlikely(family >= NPROTO))
2514                 return NULL;
2515
2516         return rcu_dereference(xfrm_state_afinfo[family]);
2517 }
2518 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2519
2520 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2521 {
2522         struct xfrm_state_afinfo *afinfo;
2523         if (unlikely(family >= NPROTO))
2524                 return NULL;
2525         rcu_read_lock();
2526         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2527         if (unlikely(!afinfo))
2528                 rcu_read_unlock();
2529         return afinfo;
2530 }
2531
2532 void xfrm_flush_gc(void)
2533 {
2534         flush_work(&xfrm_state_gc_work);
2535 }
2536 EXPORT_SYMBOL(xfrm_flush_gc);
2537
2538 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2539 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2540 {
2541         if (x->tunnel) {
2542                 struct xfrm_state *t = x->tunnel;
2543
2544                 if (atomic_read(&t->tunnel_users) == 2)
2545                         xfrm_state_delete(t);
2546                 atomic_dec(&t->tunnel_users);
2547                 xfrm_state_put_sync(t);
2548                 x->tunnel = NULL;
2549         }
2550 }
2551 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2552
2553 u32 __xfrm_state_mtu(struct xfrm_state *x, int mtu)
2554 {
2555         const struct xfrm_type *type = READ_ONCE(x->type);
2556         struct crypto_aead *aead;
2557         u32 blksize, net_adj = 0;
2558
2559         if (x->km.state != XFRM_STATE_VALID ||
2560             !type || type->proto != IPPROTO_ESP)
2561                 return mtu - x->props.header_len;
2562
2563         aead = x->data;
2564         blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2565
2566         switch (x->props.mode) {
2567         case XFRM_MODE_TRANSPORT:
2568         case XFRM_MODE_BEET:
2569                 if (x->props.family == AF_INET)
2570                         net_adj = sizeof(struct iphdr);
2571                 else if (x->props.family == AF_INET6)
2572                         net_adj = sizeof(struct ipv6hdr);
2573                 break;
2574         case XFRM_MODE_TUNNEL:
2575                 break;
2576         default:
2577                 WARN_ON_ONCE(1);
2578                 break;
2579         }
2580
2581         return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2582                  net_adj) & ~(blksize - 1)) + net_adj - 2;
2583 }
2584 EXPORT_SYMBOL_GPL(__xfrm_state_mtu);
2585
2586 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2587 {
2588         mtu = __xfrm_state_mtu(x, mtu);
2589
2590         if (x->props.family == AF_INET6 && mtu < IPV6_MIN_MTU)
2591                 return IPV6_MIN_MTU;
2592
2593         return mtu;
2594 }
2595
2596 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2597 {
2598         const struct xfrm_mode *inner_mode;
2599         const struct xfrm_mode *outer_mode;
2600         int family = x->props.family;
2601         int err;
2602
2603         if (family == AF_INET &&
2604             xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
2605                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2606
2607         err = -EPROTONOSUPPORT;
2608
2609         if (x->sel.family != AF_UNSPEC) {
2610                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2611                 if (inner_mode == NULL)
2612                         goto error;
2613
2614                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2615                     family != x->sel.family)
2616                         goto error;
2617
2618                 x->inner_mode = *inner_mode;
2619         } else {
2620                 const struct xfrm_mode *inner_mode_iaf;
2621                 int iafamily = AF_INET;
2622
2623                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2624                 if (inner_mode == NULL)
2625                         goto error;
2626
2627                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2628                         goto error;
2629
2630                 x->inner_mode = *inner_mode;
2631
2632                 if (x->props.family == AF_INET)
2633                         iafamily = AF_INET6;
2634
2635                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2636                 if (inner_mode_iaf) {
2637                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2638                                 x->inner_mode_iaf = *inner_mode_iaf;
2639                 }
2640         }
2641
2642         x->type = xfrm_get_type(x->id.proto, family);
2643         if (x->type == NULL)
2644                 goto error;
2645
2646         x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2647
2648         err = x->type->init_state(x);
2649         if (err)
2650                 goto error;
2651
2652         outer_mode = xfrm_get_mode(x->props.mode, family);
2653         if (!outer_mode) {
2654                 err = -EPROTONOSUPPORT;
2655                 goto error;
2656         }
2657
2658         x->outer_mode = *outer_mode;
2659         if (init_replay) {
2660                 err = xfrm_init_replay(x);
2661                 if (err)
2662                         goto error;
2663         }
2664
2665 error:
2666         return err;
2667 }
2668
2669 EXPORT_SYMBOL(__xfrm_init_state);
2670
2671 int xfrm_init_state(struct xfrm_state *x)
2672 {
2673         int err;
2674
2675         err = __xfrm_init_state(x, true, false);
2676         if (!err)
2677                 x->km.state = XFRM_STATE_VALID;
2678
2679         return err;
2680 }
2681
2682 EXPORT_SYMBOL(xfrm_init_state);
2683
2684 int __net_init xfrm_state_init(struct net *net)
2685 {
2686         unsigned int sz;
2687
2688         if (net_eq(net, &init_net))
2689                 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2690                                               SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2691
2692         INIT_LIST_HEAD(&net->xfrm.state_all);
2693
2694         sz = sizeof(struct hlist_head) * 8;
2695
2696         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2697         if (!net->xfrm.state_bydst)
2698                 goto out_bydst;
2699         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2700         if (!net->xfrm.state_bysrc)
2701                 goto out_bysrc;
2702         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2703         if (!net->xfrm.state_byspi)
2704                 goto out_byspi;
2705         net->xfrm.state_byseq = xfrm_hash_alloc(sz);
2706         if (!net->xfrm.state_byseq)
2707                 goto out_byseq;
2708         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2709
2710         net->xfrm.state_num = 0;
2711         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2712         spin_lock_init(&net->xfrm.xfrm_state_lock);
2713         seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2714                                &net->xfrm.xfrm_state_lock);
2715         return 0;
2716
2717 out_byseq:
2718         xfrm_hash_free(net->xfrm.state_byspi, sz);
2719 out_byspi:
2720         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2721 out_bysrc:
2722         xfrm_hash_free(net->xfrm.state_bydst, sz);
2723 out_bydst:
2724         return -ENOMEM;
2725 }
2726
2727 void xfrm_state_fini(struct net *net)
2728 {
2729         unsigned int sz;
2730
2731         flush_work(&net->xfrm.state_hash_work);
2732         flush_work(&xfrm_state_gc_work);
2733         xfrm_state_flush(net, 0, false, true);
2734
2735         WARN_ON(!list_empty(&net->xfrm.state_all));
2736
2737         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2738         WARN_ON(!hlist_empty(net->xfrm.state_byseq));
2739         xfrm_hash_free(net->xfrm.state_byseq, sz);
2740         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2741         xfrm_hash_free(net->xfrm.state_byspi, sz);
2742         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2743         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2744         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2745         xfrm_hash_free(net->xfrm.state_bydst, sz);
2746 }
2747
2748 #ifdef CONFIG_AUDITSYSCALL
2749 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2750                                      struct audit_buffer *audit_buf)
2751 {
2752         struct xfrm_sec_ctx *ctx = x->security;
2753         u32 spi = ntohl(x->id.spi);
2754
2755         if (ctx)
2756                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2757                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2758
2759         switch (x->props.family) {
2760         case AF_INET:
2761                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2762                                  &x->props.saddr.a4, &x->id.daddr.a4);
2763                 break;
2764         case AF_INET6:
2765                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2766                                  x->props.saddr.a6, x->id.daddr.a6);
2767                 break;
2768         }
2769
2770         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2771 }
2772
2773 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2774                                       struct audit_buffer *audit_buf)
2775 {
2776         const struct iphdr *iph4;
2777         const struct ipv6hdr *iph6;
2778
2779         switch (family) {
2780         case AF_INET:
2781                 iph4 = ip_hdr(skb);
2782                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2783                                  &iph4->saddr, &iph4->daddr);
2784                 break;
2785         case AF_INET6:
2786                 iph6 = ipv6_hdr(skb);
2787                 audit_log_format(audit_buf,
2788                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2789                                  &iph6->saddr, &iph6->daddr,
2790                                  iph6->flow_lbl[0] & 0x0f,
2791                                  iph6->flow_lbl[1],
2792                                  iph6->flow_lbl[2]);
2793                 break;
2794         }
2795 }
2796
2797 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2798 {
2799         struct audit_buffer *audit_buf;
2800
2801         audit_buf = xfrm_audit_start("SAD-add");
2802         if (audit_buf == NULL)
2803                 return;
2804         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2805         xfrm_audit_helper_sainfo(x, audit_buf);
2806         audit_log_format(audit_buf, " res=%u", result);
2807         audit_log_end(audit_buf);
2808 }
2809 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2810
2811 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2812 {
2813         struct audit_buffer *audit_buf;
2814
2815         audit_buf = xfrm_audit_start("SAD-delete");
2816         if (audit_buf == NULL)
2817                 return;
2818         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2819         xfrm_audit_helper_sainfo(x, audit_buf);
2820         audit_log_format(audit_buf, " res=%u", result);
2821         audit_log_end(audit_buf);
2822 }
2823 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2824
2825 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2826                                       struct sk_buff *skb)
2827 {
2828         struct audit_buffer *audit_buf;
2829         u32 spi;
2830
2831         audit_buf = xfrm_audit_start("SA-replay-overflow");
2832         if (audit_buf == NULL)
2833                 return;
2834         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2835         /* don't record the sequence number because it's inherent in this kind
2836          * of audit message */
2837         spi = ntohl(x->id.spi);
2838         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2839         audit_log_end(audit_buf);
2840 }
2841 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2842
2843 void xfrm_audit_state_replay(struct xfrm_state *x,
2844                              struct sk_buff *skb, __be32 net_seq)
2845 {
2846         struct audit_buffer *audit_buf;
2847         u32 spi;
2848
2849         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2850         if (audit_buf == NULL)
2851                 return;
2852         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2853         spi = ntohl(x->id.spi);
2854         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2855                          spi, spi, ntohl(net_seq));
2856         audit_log_end(audit_buf);
2857 }
2858 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2859
2860 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2861 {
2862         struct audit_buffer *audit_buf;
2863
2864         audit_buf = xfrm_audit_start("SA-notfound");
2865         if (audit_buf == NULL)
2866                 return;
2867         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2868         audit_log_end(audit_buf);
2869 }
2870 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2871
2872 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2873                                __be32 net_spi, __be32 net_seq)
2874 {
2875         struct audit_buffer *audit_buf;
2876         u32 spi;
2877
2878         audit_buf = xfrm_audit_start("SA-notfound");
2879         if (audit_buf == NULL)
2880                 return;
2881         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2882         spi = ntohl(net_spi);
2883         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2884                          spi, spi, ntohl(net_seq));
2885         audit_log_end(audit_buf);
2886 }
2887 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2888
2889 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2890                               struct sk_buff *skb, u8 proto)
2891 {
2892         struct audit_buffer *audit_buf;
2893         __be32 net_spi;
2894         __be32 net_seq;
2895
2896         audit_buf = xfrm_audit_start("SA-icv-failure");
2897         if (audit_buf == NULL)
2898                 return;
2899         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2900         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2901                 u32 spi = ntohl(net_spi);
2902                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2903                                  spi, spi, ntohl(net_seq));
2904         }
2905         audit_log_end(audit_buf);
2906 }
2907 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2908 #endif /* CONFIG_AUDITSYSCALL */