net/xfrm/xfrm_state.c

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