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