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         if (x->xfrag.page)
 499                 put_page(x->xfrag.page);
 500         xfrm_dev_state_free(x);
 501         security_xfrm_state_free(x);
 502         xfrm_state_free(x);
 503 }
 504
 505 static void xfrm_state_gc_task(struct work_struct *work)
 506 {
 507         struct xfrm_state *x;
 508         struct hlist_node *tmp;
 509         struct hlist_head gc_list;
 510
 511         spin_lock_bh(&xfrm_state_gc_lock);
 512         hlist_move_list(&xfrm_state_gc_list, &gc_list);
 513         spin_unlock_bh(&xfrm_state_gc_lock);
 514
 515         synchronize_rcu();
 516
 517         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
 518                 ___xfrm_state_destroy(x);
 519 }
 520
 521 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
 522 {
 523         struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
 524         enum hrtimer_restart ret = HRTIMER_NORESTART;
 525         time64_t now = ktime_get_real_seconds();
 526         time64_t next = TIME64_MAX;
 527         int warn = 0;
 528         int err = 0;
 529
 530         spin_lock(&x->lock);
 531         if (x->km.state == XFRM_STATE_DEAD)
 532                 goto out;
 533         if (x->km.state == XFRM_STATE_EXPIRED)
 534                 goto expired;
 535         if (x->lft.hard_add_expires_seconds) {
 536                 long tmo = x->lft.hard_add_expires_seconds +
 537                         x->curlft.add_time - now;
 538                 if (tmo <= 0) {
 539                         if (x->xflags & XFRM_SOFT_EXPIRE) {
 540                                 /* enter hard expire without soft expire first?!
 541                                  * setting a new date could trigger this.
 542                                  * workaround: fix x->curflt.add_time by below:
 543                                  */
 544                                 x->curlft.add_time = now - x->saved_tmo - 1;
 545                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 546                         } else
 547                                 goto expired;
 548                 }
 549                 if (tmo < next)
 550                         next = tmo;
 551         }
 552         if (x->lft.hard_use_expires_seconds) {
 553                 long tmo = x->lft.hard_use_expires_seconds +
 554                         (x->curlft.use_time ? : now) - now;
 555                 if (tmo <= 0)
 556                         goto expired;
 557                 if (tmo < next)
 558                         next = tmo;
 559         }
 560         if (x->km.dying)
 561                 goto resched;
 562         if (x->lft.soft_add_expires_seconds) {
 563                 long tmo = x->lft.soft_add_expires_seconds +
 564                         x->curlft.add_time - now;
 565                 if (tmo <= 0) {
 566                         warn = 1;
 567                         x->xflags &= ~XFRM_SOFT_EXPIRE;
 568                 } else if (tmo < next) {
 569                         next = tmo;
 570                         x->xflags |= XFRM_SOFT_EXPIRE;
 571                         x->saved_tmo = tmo;
 572                 }
 573         }
 574         if (x->lft.soft_use_expires_seconds) {
 575                 long tmo = x->lft.soft_use_expires_seconds +
 576                         (x->curlft.use_time ? : now) - now;
 577                 if (tmo <= 0)
 578                         warn = 1;
 579                 else if (tmo < next)
 580                         next = tmo;
 581         }
 582
 583         x->km.dying = warn;
 584         if (warn)
 585                 km_state_expired(x, 0, 0);
 586 resched:
 587         if (next != TIME64_MAX) {
 588                 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
 589                 ret = HRTIMER_RESTART;
 590         }
 591
 592         goto out;
 593
 594 expired:
 595         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
 596                 x->km.state = XFRM_STATE_EXPIRED;
 597
 598         err = __xfrm_state_delete(x);
 599         if (!err)
 600                 km_state_expired(x, 1, 0);
 601
 602         xfrm_audit_state_delete(x, err ? 0 : 1, true);
 603
 604 out:
 605         spin_unlock(&x->lock);
 606         return ret;
 607 }
 608
 609 static void xfrm_replay_timer_handler(struct timer_list *t);
 610
 611 struct xfrm_state *xfrm_state_alloc(struct net *net)
 612 {
 613         struct xfrm_state *x;
 614
 615         x = kmem_cache_alloc(xfrm_state_cache, GFP_ATOMIC | __GFP_ZERO);
 616
 617         if (x) {
 618                 write_pnet(&x->xs_net, net);
 619                 refcount_set(&x->refcnt, 1);
 620                 atomic_set(&x->tunnel_users, 0);
 621                 INIT_LIST_HEAD(&x->km.all);
 622                 INIT_HLIST_NODE(&x->bydst);
 623                 INIT_HLIST_NODE(&x->bysrc);
 624                 INIT_HLIST_NODE(&x->byspi);
 625                 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
 626                 x->mtimer.function = xfrm_timer_handler;
 627                 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
 628                 x->curlft.add_time = ktime_get_real_seconds();
 629                 x->lft.soft_byte_limit = XFRM_INF;
 630                 x->lft.soft_packet_limit = XFRM_INF;
 631                 x->lft.hard_byte_limit = XFRM_INF;
 632                 x->lft.hard_packet_limit = XFRM_INF;
 633                 x->replay_maxage = 0;
 634                 x->replay_maxdiff = 0;
 635                 spin_lock_init(&x->lock);
 636         }
 637         return x;
 638 }
 639 EXPORT_SYMBOL(xfrm_state_alloc);
 640
 641 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
 642 {
 643         WARN_ON(x->km.state != XFRM_STATE_DEAD);
 644
 645         if (sync) {
 646                 synchronize_rcu();
 647                 ___xfrm_state_destroy(x);
 648         } else {
 649                 spin_lock_bh(&xfrm_state_gc_lock);
 650                 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
 651                 spin_unlock_bh(&xfrm_state_gc_lock);
 652                 schedule_work(&xfrm_state_gc_work);
 653         }
 654 }
 655 EXPORT_SYMBOL(__xfrm_state_destroy);
 656
 657 int __xfrm_state_delete(struct xfrm_state *x)
 658 {
 659         struct net *net = xs_net(x);
 660         int err = -ESRCH;
 661
 662         if (x->km.state != XFRM_STATE_DEAD) {
 663                 x->km.state = XFRM_STATE_DEAD;
 664                 spin_lock(&net->xfrm.xfrm_state_lock);
 665                 list_del(&x->km.all);
 666                 hlist_del_rcu(&x->bydst);
 667                 hlist_del_rcu(&x->bysrc);
 668                 if (x->id.spi)
 669                         hlist_del_rcu(&x->byspi);
 670                 net->xfrm.state_num--;
 671                 spin_unlock(&net->xfrm.xfrm_state_lock);
 672
 673                 xfrm_dev_state_delete(x);
 674
 675                 /* All xfrm_state objects are created by xfrm_state_alloc.
 676                  * The xfrm_state_alloc call gives a reference, and that
 677                  * is what we are dropping here.
 678                  */
 679                 xfrm_state_put(x);
 680                 err = 0;
 681         }
 682
 683         return err;
 684 }
 685 EXPORT_SYMBOL(__xfrm_state_delete);
 686
 687 int xfrm_state_delete(struct xfrm_state *x)
 688 {
 689         int err;
 690
 691         spin_lock_bh(&x->lock);
 692         err = __xfrm_state_delete(x);
 693         spin_unlock_bh(&x->lock);
 694
 695         return err;
 696 }
 697 EXPORT_SYMBOL(xfrm_state_delete);
 698
 699 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 700 static inline int
 701 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 702 {
 703         int i, err = 0;
 704
 705         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 706                 struct xfrm_state *x;
 707
 708                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 709                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 710                            (err = security_xfrm_state_delete(x)) != 0) {
 711                                 xfrm_audit_state_delete(x, 0, task_valid);
 712                                 return err;
 713                         }
 714                 }
 715         }
 716
 717         return err;
 718 }
 719
 720 static inline int
 721 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 722 {
 723         int i, err = 0;
 724
 725         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 726                 struct xfrm_state *x;
 727                 struct xfrm_state_offload *xso;
 728
 729                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 730                         xso = &x->xso;
 731
 732                         if (xso->dev == dev &&
 733                            (err = security_xfrm_state_delete(x)) != 0) {
 734                                 xfrm_audit_state_delete(x, 0, task_valid);
 735                                 return err;
 736                         }
 737                 }
 738         }
 739
 740         return err;
 741 }
 742 #else
 743 static inline int
 744 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 745 {
 746         return 0;
 747 }
 748
 749 static inline int
 750 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 751 {
 752         return 0;
 753 }
 754 #endif
 755
 756 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
 757 {
 758         int i, err = 0, cnt = 0;
 759
 760         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 761         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
 762         if (err)
 763                 goto out;
 764
 765         err = -ESRCH;
 766         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 767                 struct xfrm_state *x;
 768 restart:
 769                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 770                         if (!xfrm_state_kern(x) &&
 771                             xfrm_id_proto_match(x->id.proto, proto)) {
 772                                 xfrm_state_hold(x);
 773                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 774
 775                                 err = xfrm_state_delete(x);
 776                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 777                                                         task_valid);
 778                                 if (sync)
 779                                         xfrm_state_put_sync(x);
 780                                 else
 781                                         xfrm_state_put(x);
 782                                 if (!err)
 783                                         cnt++;
 784
 785                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 786                                 goto restart;
 787                         }
 788                 }
 789         }
 790 out:
 791         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 792         if (cnt)
 793                 err = 0;
 794
 795         return err;
 796 }
 797 EXPORT_SYMBOL(xfrm_state_flush);
 798
 799 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
 800 {
 801         int i, err = 0, cnt = 0;
 802
 803         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 804         err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
 805         if (err)
 806                 goto out;
 807
 808         err = -ESRCH;
 809         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 810                 struct xfrm_state *x;
 811                 struct xfrm_state_offload *xso;
 812 restart:
 813                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 814                         xso = &x->xso;
 815
 816                         if (!xfrm_state_kern(x) && xso->dev == dev) {
 817                                 xfrm_state_hold(x);
 818                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 819
 820                                 err = xfrm_state_delete(x);
 821                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 822                                                         task_valid);
 823                                 xfrm_state_put(x);
 824                                 if (!err)
 825                                         cnt++;
 826
 827                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 828                                 goto restart;
 829                         }
 830                 }
 831         }
 832         if (cnt)
 833                 err = 0;
 834
 835 out:
 836         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 837         return err;
 838 }
 839 EXPORT_SYMBOL(xfrm_dev_state_flush);
 840
 841 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 842 {
 843         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 844         si->sadcnt = net->xfrm.state_num;
 845         si->sadhcnt = net->xfrm.state_hmask + 1;
 846         si->sadhmcnt = xfrm_state_hashmax;
 847         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 848 }
 849 EXPORT_SYMBOL(xfrm_sad_getinfo);
 850
 851 static void
 852 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 853 {
 854         const struct flowi4 *fl4 = &fl->u.ip4;
 855
 856         sel->daddr.a4 = fl4->daddr;
 857         sel->saddr.a4 = fl4->saddr;
 858         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
 859         sel->dport_mask = htons(0xffff);
 860         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
 861         sel->sport_mask = htons(0xffff);
 862         sel->family = AF_INET;
 863         sel->prefixlen_d = 32;
 864         sel->prefixlen_s = 32;
 865         sel->proto = fl4->flowi4_proto;
 866         sel->ifindex = fl4->flowi4_oif;
 867 }
 868
 869 static void
 870 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 871 {
 872         const struct flowi6 *fl6 = &fl->u.ip6;
 873
 874         /* Initialize temporary selector matching only to current session. */
 875         *(struct in6_addr *)&sel->daddr = fl6->daddr;
 876         *(struct in6_addr *)&sel->saddr = fl6->saddr;
 877         sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
 878         sel->dport_mask = htons(0xffff);
 879         sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
 880         sel->sport_mask = htons(0xffff);
 881         sel->family = AF_INET6;
 882         sel->prefixlen_d = 128;
 883         sel->prefixlen_s = 128;
 884         sel->proto = fl6->flowi6_proto;
 885         sel->ifindex = fl6->flowi6_oif;
 886 }
 887
 888 static void
 889 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 890                     const struct xfrm_tmpl *tmpl,
 891                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 892                     unsigned short family)
 893 {
 894         switch (family) {
 895         case AF_INET:
 896                 __xfrm4_init_tempsel(&x->sel, fl);
 897                 break;
 898         case AF_INET6:
 899                 __xfrm6_init_tempsel(&x->sel, fl);
 900                 break;
 901         }
 902
 903         x->id = tmpl->id;
 904
 905         switch (tmpl->encap_family) {
 906         case AF_INET:
 907                 if (x->id.daddr.a4 == 0)
 908                         x->id.daddr.a4 = daddr->a4;
 909                 x->props.saddr = tmpl->saddr;
 910                 if (x->props.saddr.a4 == 0)
 911                         x->props.saddr.a4 = saddr->a4;
 912                 break;
 913         case AF_INET6:
 914                 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
 915                         memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
 916                 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
 917                 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
 918                         memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
 919                 break;
 920         }
 921
 922         x->props.mode = tmpl->mode;
 923         x->props.reqid = tmpl->reqid;
 924         x->props.family = tmpl->encap_family;
 925 }
 926
 927 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
 928                                               const xfrm_address_t *daddr,
 929                                               __be32 spi, u8 proto,
 930                                               unsigned short family)
 931 {
 932         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 933         struct xfrm_state *x;
 934
 935         hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
 936                 if (x->props.family != family ||
 937                     x->id.spi       != spi ||
 938                     x->id.proto     != proto ||
 939                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
 940                         continue;
 941
 942                 if ((mark & x->mark.m) != x->mark.v)
 943                         continue;
 944                 if (!xfrm_state_hold_rcu(x))
 945                         continue;
 946                 return x;
 947         }
 948
 949         return NULL;
 950 }
 951
 952 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 953                                                      const xfrm_address_t *daddr,
 954                                                      const xfrm_address_t *saddr,
 955                                                      u8 proto, unsigned short family)
 956 {
 957         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 958         struct xfrm_state *x;
 959
 960         hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
 961                 if (x->props.family != family ||
 962                     x->id.proto     != proto ||
 963                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
 964                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
 965                         continue;
 966
 967                 if ((mark & x->mark.m) != x->mark.v)
 968                         continue;
 969                 if (!xfrm_state_hold_rcu(x))
 970                         continue;
 971                 return x;
 972         }
 973
 974         return NULL;
 975 }
 976
 977 static inline struct xfrm_state *
 978 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 979 {
 980         struct net *net = xs_net(x);
 981         u32 mark = x->mark.v & x->mark.m;
 982
 983         if (use_spi)
 984                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
 985                                            x->id.spi, x->id.proto, family);
 986         else
 987                 return __xfrm_state_lookup_byaddr(net, mark,
 988                                                   &x->id.daddr,
 989                                                   &x->props.saddr,
 990                                                   x->id.proto, family);
 991 }
 992
 993 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 994 {
 995         if (have_hash_collision &&
 996             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 997             net->xfrm.state_num > net->xfrm.state_hmask)
 998                 schedule_work(&net->xfrm.state_hash_work);
 999 }
1000
1001 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1002                                const struct flowi *fl, unsigned short family,
1003                                struct xfrm_state **best, int *acq_in_progress,
1004                                int *error)
1005 {
1006         /* Resolution logic:
1007          * 1. There is a valid state with matching selector. Done.
1008          * 2. Valid state with inappropriate selector. Skip.
1009          *
1010          * Entering area of "sysdeps".
1011          *
1012          * 3. If state is not valid, selector is temporary, it selects
1013          *    only session which triggered previous resolution. Key
1014          *    manager will do something to install a state with proper
1015          *    selector.
1016          */
1017         if (x->km.state == XFRM_STATE_VALID) {
1018                 if ((x->sel.family &&
1019                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
1020                     !security_xfrm_state_pol_flow_match(x, pol, fl))
1021                         return;
1022
1023                 if (!*best ||
1024                     (*best)->km.dying > x->km.dying ||
1025                     ((*best)->km.dying == x->km.dying &&
1026                      (*best)->curlft.add_time < x->curlft.add_time))
1027                         *best = x;
1028         } else if (x->km.state == XFRM_STATE_ACQ) {
1029                 *acq_in_progress = 1;
1030         } else if (x->km.state == XFRM_STATE_ERROR ||
1031                    x->km.state == XFRM_STATE_EXPIRED) {
1032                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
1033                     security_xfrm_state_pol_flow_match(x, pol, fl))
1034                         *error = -ESRCH;
1035         }
1036 }
1037
1038 struct xfrm_state *
1039 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1040                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1041                 struct xfrm_policy *pol, int *err,
1042                 unsigned short family, u32 if_id)
1043 {
1044         static xfrm_address_t saddr_wildcard = { };
1045         struct net *net = xp_net(pol);
1046         unsigned int h, h_wildcard;
1047         struct xfrm_state *x, *x0, *to_put;
1048         int acquire_in_progress = 0;
1049         int error = 0;
1050         struct xfrm_state *best = NULL;
1051         u32 mark = pol->mark.v & pol->mark.m;
1052         unsigned short encap_family = tmpl->encap_family;
1053         unsigned int sequence;
1054         struct km_event c;
1055
1056         to_put = NULL;
1057
1058         sequence = read_seqcount_begin(&xfrm_state_hash_generation);
1059
1060         rcu_read_lock();
1061         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1062         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1063                 if (x->props.family == encap_family &&
1064                     x->props.reqid == tmpl->reqid &&
1065                     (mark & x->mark.m) == x->mark.v &&
1066                     x->if_id == if_id &&
1067                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1068                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1069                     tmpl->mode == x->props.mode &&
1070                     tmpl->id.proto == x->id.proto &&
1071                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1072                         xfrm_state_look_at(pol, x, fl, encap_family,
1073                                            &best, &acquire_in_progress, &error);
1074         }
1075         if (best || acquire_in_progress)
1076                 goto found;
1077
1078         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1079         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1080                 if (x->props.family == encap_family &&
1081                     x->props.reqid == tmpl->reqid &&
1082                     (mark & x->mark.m) == x->mark.v &&
1083                     x->if_id == if_id &&
1084                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1085                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1086                     tmpl->mode == x->props.mode &&
1087                     tmpl->id.proto == x->id.proto &&
1088                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1089                         xfrm_state_look_at(pol, x, fl, encap_family,
1090                                            &best, &acquire_in_progress, &error);
1091         }
1092
1093 found:
1094         x = best;
1095         if (!x && !error && !acquire_in_progress) {
1096                 if (tmpl->id.spi &&
1097                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
1098                                               tmpl->id.proto, encap_family)) != NULL) {
1099                         to_put = x0;
1100                         error = -EEXIST;
1101                         goto out;
1102                 }
1103
1104                 c.net = net;
1105                 /* If the KMs have no listeners (yet...), avoid allocating an SA
1106                  * for each and every packet - garbage collection might not
1107                  * handle the flood.
1108                  */
1109                 if (!km_is_alive(&c)) {
1110                         error = -ESRCH;
1111                         goto out;
1112                 }
1113
1114                 x = xfrm_state_alloc(net);
1115                 if (x == NULL) {
1116                         error = -ENOMEM;
1117                         goto out;
1118                 }
1119                 /* Initialize temporary state matching only
1120                  * to current session. */
1121                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1122                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1123                 x->if_id = if_id;
1124
1125                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1126                 if (error) {
1127                         x->km.state = XFRM_STATE_DEAD;
1128                         to_put = x;
1129                         x = NULL;
1130                         goto out;
1131                 }
1132
1133                 if (km_query(x, tmpl, pol) == 0) {
1134                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1135                         x->km.state = XFRM_STATE_ACQ;
1136                         list_add(&x->km.all, &net->xfrm.state_all);
1137                         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1138                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
1139                         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1140                         if (x->id.spi) {
1141                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1142                                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1143                         }
1144                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1145                         hrtimer_start(&x->mtimer,
1146                                       ktime_set(net->xfrm.sysctl_acq_expires, 0),
1147                                       HRTIMER_MODE_REL_SOFT);
1148                         net->xfrm.state_num++;
1149                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1150                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1151                 } else {
1152                         x->km.state = XFRM_STATE_DEAD;
1153                         to_put = x;
1154                         x = NULL;
1155                         error = -ESRCH;
1156                 }
1157         }
1158 out:
1159         if (x) {
1160                 if (!xfrm_state_hold_rcu(x)) {
1161                         *err = -EAGAIN;
1162                         x = NULL;
1163                 }
1164         } else {
1165                 *err = acquire_in_progress ? -EAGAIN : error;
1166         }
1167         rcu_read_unlock();
1168         if (to_put)
1169                 xfrm_state_put(to_put);
1170
1171         if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
1172                 *err = -EAGAIN;
1173                 if (x) {
1174                         xfrm_state_put(x);
1175                         x = NULL;
1176                 }
1177         }
1178
1179         return x;
1180 }
1181
1182 struct xfrm_state *
1183 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1184                     xfrm_address_t *daddr, xfrm_address_t *saddr,
1185                     unsigned short family, u8 mode, u8 proto, u32 reqid)
1186 {
1187         unsigned int h;
1188         struct xfrm_state *rx = NULL, *x = NULL;
1189
1190         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1191         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1192         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1193                 if (x->props.family == family &&
1194                     x->props.reqid == reqid &&
1195                     (mark & x->mark.m) == x->mark.v &&
1196                     x->if_id == if_id &&
1197                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1198                     xfrm_state_addr_check(x, daddr, saddr, family) &&
1199                     mode == x->props.mode &&
1200                     proto == x->id.proto &&
1201                     x->km.state == XFRM_STATE_VALID) {
1202                         rx = x;
1203                         break;
1204                 }
1205         }
1206
1207         if (rx)
1208                 xfrm_state_hold(rx);
1209         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1210
1211
1212         return rx;
1213 }
1214 EXPORT_SYMBOL(xfrm_stateonly_find);
1215
1216 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1217                                               unsigned short family)
1218 {
1219         struct xfrm_state *x;
1220         struct xfrm_state_walk *w;
1221
1222         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1223         list_for_each_entry(w, &net->xfrm.state_all, all) {
1224                 x = container_of(w, struct xfrm_state, km);
1225                 if (x->props.family != family ||
1226                         x->id.spi != spi)
1227                         continue;
1228
1229                 xfrm_state_hold(x);
1230                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1231                 return x;
1232         }
1233         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1234         return NULL;
1235 }
1236 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1237
1238 static void __xfrm_state_insert(struct xfrm_state *x)
1239 {
1240         struct net *net = xs_net(x);
1241         unsigned int h;
1242
1243         list_add(&x->km.all, &net->xfrm.state_all);
1244
1245         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1246                           x->props.reqid, x->props.family);
1247         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1248
1249         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1250         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1251
1252         if (x->id.spi) {
1253                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1254                                   x->props.family);
1255
1256                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1257         }
1258
1259         hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1260         if (x->replay_maxage)
1261                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1262
1263         net->xfrm.state_num++;
1264
1265         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1266 }
1267
1268 /* net->xfrm.xfrm_state_lock is held */
1269 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1270 {
1271         struct net *net = xs_net(xnew);
1272         unsigned short family = xnew->props.family;
1273         u32 reqid = xnew->props.reqid;
1274         struct xfrm_state *x;
1275         unsigned int h;
1276         u32 mark = xnew->mark.v & xnew->mark.m;
1277         u32 if_id = xnew->if_id;
1278
1279         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1280         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1281                 if (x->props.family     == family &&
1282                     x->props.reqid      == reqid &&
1283                     x->if_id            == if_id &&
1284                     (mark & x->mark.m) == x->mark.v &&
1285                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1286                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1287                         x->genid++;
1288         }
1289 }
1290
1291 void xfrm_state_insert(struct xfrm_state *x)
1292 {
1293         struct net *net = xs_net(x);
1294
1295         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1296         __xfrm_state_bump_genids(x);
1297         __xfrm_state_insert(x);
1298         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1299 }
1300 EXPORT_SYMBOL(xfrm_state_insert);
1301
1302 /* net->xfrm.xfrm_state_lock is held */
1303 static struct xfrm_state *__find_acq_core(struct net *net,
1304                                           const struct xfrm_mark *m,
1305                                           unsigned short family, u8 mode,
1306                                           u32 reqid, u32 if_id, u8 proto,
1307                                           const xfrm_address_t *daddr,
1308                                           const xfrm_address_t *saddr,
1309                                           int create)
1310 {
1311         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1312         struct xfrm_state *x;
1313         u32 mark = m->v & m->m;
1314
1315         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1316                 if (x->props.reqid  != reqid ||
1317                     x->props.mode   != mode ||
1318                     x->props.family != family ||
1319                     x->km.state     != XFRM_STATE_ACQ ||
1320                     x->id.spi       != 0 ||
1321                     x->id.proto     != proto ||
1322                     (mark & x->mark.m) != x->mark.v ||
1323                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1324                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1325                         continue;
1326
1327                 xfrm_state_hold(x);
1328                 return x;
1329         }
1330
1331         if (!create)
1332                 return NULL;
1333
1334         x = xfrm_state_alloc(net);
1335         if (likely(x)) {
1336                 switch (family) {
1337                 case AF_INET:
1338                         x->sel.daddr.a4 = daddr->a4;
1339                         x->sel.saddr.a4 = saddr->a4;
1340                         x->sel.prefixlen_d = 32;
1341                         x->sel.prefixlen_s = 32;
1342                         x->props.saddr.a4 = saddr->a4;
1343                         x->id.daddr.a4 = daddr->a4;
1344                         break;
1345
1346                 case AF_INET6:
1347                         x->sel.daddr.in6 = daddr->in6;
1348                         x->sel.saddr.in6 = saddr->in6;
1349                         x->sel.prefixlen_d = 128;
1350                         x->sel.prefixlen_s = 128;
1351                         x->props.saddr.in6 = saddr->in6;
1352                         x->id.daddr.in6 = daddr->in6;
1353                         break;
1354                 }
1355
1356                 x->km.state = XFRM_STATE_ACQ;
1357                 x->id.proto = proto;
1358                 x->props.family = family;
1359                 x->props.mode = mode;
1360                 x->props.reqid = reqid;
1361                 x->if_id = if_id;
1362                 x->mark.v = m->v;
1363                 x->mark.m = m->m;
1364                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1365                 xfrm_state_hold(x);
1366                 hrtimer_start(&x->mtimer,
1367                               ktime_set(net->xfrm.sysctl_acq_expires, 0),
1368                               HRTIMER_MODE_REL_SOFT);
1369                 list_add(&x->km.all, &net->xfrm.state_all);
1370                 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1371                 h = xfrm_src_hash(net, daddr, saddr, family);
1372                 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1373
1374                 net->xfrm.state_num++;
1375
1376                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1377         }
1378
1379         return x;
1380 }
1381
1382 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1383
1384 int xfrm_state_add(struct xfrm_state *x)
1385 {
1386         struct net *net = xs_net(x);
1387         struct xfrm_state *x1, *to_put;
1388         int family;
1389         int err;
1390         u32 mark = x->mark.v & x->mark.m;
1391         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1392
1393         family = x->props.family;
1394
1395         to_put = NULL;
1396
1397         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1398
1399         x1 = __xfrm_state_locate(x, use_spi, family);
1400         if (x1) {
1401                 to_put = x1;
1402                 x1 = NULL;
1403                 err = -EEXIST;
1404                 goto out;
1405         }
1406
1407         if (use_spi && x->km.seq) {
1408                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1409                 if (x1 && ((x1->id.proto != x->id.proto) ||
1410                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1411                         to_put = x1;
1412                         x1 = NULL;
1413                 }
1414         }
1415
1416         if (use_spi && !x1)
1417                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1418                                      x->props.reqid, x->if_id, x->id.proto,
1419                                      &x->id.daddr, &x->props.saddr, 0);
1420
1421         __xfrm_state_bump_genids(x);
1422         __xfrm_state_insert(x);
1423         err = 0;
1424
1425 out:
1426         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1427
1428         if (x1) {
1429                 xfrm_state_delete(x1);
1430                 xfrm_state_put(x1);
1431         }
1432
1433         if (to_put)
1434                 xfrm_state_put(to_put);
1435
1436         return err;
1437 }
1438 EXPORT_SYMBOL(xfrm_state_add);
1439
1440 #ifdef CONFIG_XFRM_MIGRATE
1441 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1442                                            struct xfrm_encap_tmpl *encap)
1443 {
1444         struct net *net = xs_net(orig);
1445         struct xfrm_state *x = xfrm_state_alloc(net);
1446         if (!x)
1447                 goto out;
1448
1449         memcpy(&x->id, &orig->id, sizeof(x->id));
1450         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1451         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1452         x->props.mode = orig->props.mode;
1453         x->props.replay_window = orig->props.replay_window;
1454         x->props.reqid = orig->props.reqid;
1455         x->props.family = orig->props.family;
1456         x->props.saddr = orig->props.saddr;
1457
1458         if (orig->aalg) {
1459                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1460                 if (!x->aalg)
1461                         goto error;
1462         }
1463         x->props.aalgo = orig->props.aalgo;
1464
1465         if (orig->aead) {
1466                 x->aead = xfrm_algo_aead_clone(orig->aead);
1467                 x->geniv = orig->geniv;
1468                 if (!x->aead)
1469                         goto error;
1470         }
1471         if (orig->ealg) {
1472                 x->ealg = xfrm_algo_clone(orig->ealg);
1473                 if (!x->ealg)
1474                         goto error;
1475         }
1476         x->props.ealgo = orig->props.ealgo;
1477
1478         if (orig->calg) {
1479                 x->calg = xfrm_algo_clone(orig->calg);
1480                 if (!x->calg)
1481                         goto error;
1482         }
1483         x->props.calgo = orig->props.calgo;
1484
1485         if (encap || orig->encap) {
1486                 if (encap)
1487                         x->encap = kmemdup(encap, sizeof(*x->encap),
1488                                         GFP_KERNEL);
1489                 else
1490                         x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1491                                         GFP_KERNEL);
1492
1493                 if (!x->encap)
1494                         goto error;
1495         }
1496
1497         if (orig->coaddr) {
1498                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1499                                     GFP_KERNEL);
1500                 if (!x->coaddr)
1501                         goto error;
1502         }
1503
1504         if (orig->replay_esn) {
1505                 if (xfrm_replay_clone(x, orig))
1506                         goto error;
1507         }
1508
1509         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1510
1511         if (xfrm_init_state(x) < 0)
1512                 goto error;
1513
1514         x->props.flags = orig->props.flags;
1515         x->props.extra_flags = orig->props.extra_flags;
1516
1517         x->if_id = orig->if_id;
1518         x->tfcpad = orig->tfcpad;
1519         x->replay_maxdiff = orig->replay_maxdiff;
1520         x->replay_maxage = orig->replay_maxage;
1521         x->curlft.add_time = orig->curlft.add_time;
1522         x->km.state = orig->km.state;
1523         x->km.seq = orig->km.seq;
1524         x->replay = orig->replay;
1525         x->preplay = orig->preplay;
1526
1527         return x;
1528
1529  error:
1530         xfrm_state_put(x);
1531 out:
1532         return NULL;
1533 }
1534
1535 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1536 {
1537         unsigned int h;
1538         struct xfrm_state *x = NULL;
1539
1540         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1541
1542         if (m->reqid) {
1543                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1544                                   m->reqid, m->old_family);
1545                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1546                         if (x->props.mode != m->mode ||
1547                             x->id.proto != m->proto)
1548                                 continue;
1549                         if (m->reqid && x->props.reqid != m->reqid)
1550                                 continue;
1551                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1552                                              m->old_family) ||
1553                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1554                                              m->old_family))
1555                                 continue;
1556                         xfrm_state_hold(x);
1557                         break;
1558                 }
1559         } else {
1560                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1561                                   m->old_family);
1562                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1563                         if (x->props.mode != m->mode ||
1564                             x->id.proto != m->proto)
1565                                 continue;
1566                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1567                                              m->old_family) ||
1568                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1569                                              m->old_family))
1570                                 continue;
1571                         xfrm_state_hold(x);
1572                         break;
1573                 }
1574         }
1575
1576         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1577
1578         return x;
1579 }
1580 EXPORT_SYMBOL(xfrm_migrate_state_find);
1581
1582 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1583                                       struct xfrm_migrate *m,
1584                                       struct xfrm_encap_tmpl *encap)
1585 {
1586         struct xfrm_state *xc;
1587
1588         xc = xfrm_state_clone(x, encap);
1589         if (!xc)
1590                 return NULL;
1591
1592         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1593         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1594
1595         /* add state */
1596         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1597                 /* a care is needed when the destination address of the
1598                    state is to be updated as it is a part of triplet */
1599                 xfrm_state_insert(xc);
1600         } else {
1601                 if (xfrm_state_add(xc) < 0)
1602                         goto error;
1603         }
1604
1605         return xc;
1606 error:
1607         xfrm_state_put(xc);
1608         return NULL;
1609 }
1610 EXPORT_SYMBOL(xfrm_state_migrate);
1611 #endif
1612
1613 int xfrm_state_update(struct xfrm_state *x)
1614 {
1615         struct xfrm_state *x1, *to_put;
1616         int err;
1617         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1618         struct net *net = xs_net(x);
1619
1620         to_put = NULL;
1621
1622         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1623         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1624
1625         err = -ESRCH;
1626         if (!x1)
1627                 goto out;
1628
1629         if (xfrm_state_kern(x1)) {
1630                 to_put = x1;
1631                 err = -EEXIST;
1632                 goto out;
1633         }
1634
1635         if (x1->km.state == XFRM_STATE_ACQ) {
1636                 __xfrm_state_insert(x);
1637                 x = NULL;
1638         }
1639         err = 0;
1640
1641 out:
1642         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1643
1644         if (to_put)
1645                 xfrm_state_put(to_put);
1646
1647         if (err)
1648                 return err;
1649
1650         if (!x) {
1651                 xfrm_state_delete(x1);
1652                 xfrm_state_put(x1);
1653                 return 0;
1654         }
1655
1656         err = -EINVAL;
1657         spin_lock_bh(&x1->lock);
1658         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1659                 if (x->encap && x1->encap &&
1660                     x->encap->encap_type == x1->encap->encap_type)
1661                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1662                 else if (x->encap || x1->encap)
1663                         goto fail;
1664
1665                 if (x->coaddr && x1->coaddr) {
1666                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1667                 }
1668                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1669                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1670                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1671                 x1->km.dying = 0;
1672
1673                 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1674                               HRTIMER_MODE_REL_SOFT);
1675                 if (x1->curlft.use_time)
1676                         xfrm_state_check_expire(x1);
1677
1678                 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1679                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1680
1681                         if (x->props.smark.m || x->props.smark.v)
1682                                 x1->props.smark = x->props.smark;
1683
1684                         if (x->if_id)
1685                                 x1->if_id = x->if_id;
1686
1687                         __xfrm_state_bump_genids(x1);
1688                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1689                 }
1690
1691                 err = 0;
1692                 x->km.state = XFRM_STATE_DEAD;
1693                 __xfrm_state_put(x);
1694         }
1695
1696 fail:
1697         spin_unlock_bh(&x1->lock);
1698
1699         xfrm_state_put(x1);
1700
1701         return err;
1702 }
1703 EXPORT_SYMBOL(xfrm_state_update);
1704
1705 int xfrm_state_check_expire(struct xfrm_state *x)
1706 {
1707         if (!x->curlft.use_time)
1708                 x->curlft.use_time = ktime_get_real_seconds();
1709
1710         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1711             x->curlft.packets >= x->lft.hard_packet_limit) {
1712                 x->km.state = XFRM_STATE_EXPIRED;
1713                 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1714                 return -EINVAL;
1715         }
1716
1717         if (!x->km.dying &&
1718             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1719              x->curlft.packets >= x->lft.soft_packet_limit)) {
1720                 x->km.dying = 1;
1721                 km_state_expired(x, 0, 0);
1722         }
1723         return 0;
1724 }
1725 EXPORT_SYMBOL(xfrm_state_check_expire);
1726
1727 struct xfrm_state *
1728 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1729                   u8 proto, unsigned short family)
1730 {
1731         struct xfrm_state *x;
1732
1733         rcu_read_lock();
1734         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1735         rcu_read_unlock();
1736         return x;
1737 }
1738 EXPORT_SYMBOL(xfrm_state_lookup);
1739
1740 struct xfrm_state *
1741 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1742                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1743                          u8 proto, unsigned short family)
1744 {
1745         struct xfrm_state *x;
1746
1747         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1748         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1749         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1750         return x;
1751 }
1752 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1753
1754 struct xfrm_state *
1755 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1756               u32 if_id, u8 proto, const xfrm_address_t *daddr,
1757               const xfrm_address_t *saddr, int create, unsigned short family)
1758 {
1759         struct xfrm_state *x;
1760
1761         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1762         x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1763         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1764
1765         return x;
1766 }
1767 EXPORT_SYMBOL(xfrm_find_acq);
1768
1769 #ifdef CONFIG_XFRM_SUB_POLICY
1770 #if IS_ENABLED(CONFIG_IPV6)
1771 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1772 static void
1773 __xfrm6_sort(void **dst, void **src, int n,
1774              int (*cmp)(const void *p), int maxclass)
1775 {
1776         int count[XFRM_MAX_DEPTH] = { };
1777         int class[XFRM_MAX_DEPTH];
1778         int i;
1779
1780         for (i = 0; i < n; i++) {
1781                 int c = cmp(src[i]);
1782
1783                 class[i] = c;
1784                 count[c]++;
1785         }
1786
1787         for (i = 2; i < maxclass; i++)
1788                 count[i] += count[i - 1];
1789
1790         for (i = 0; i < n; i++) {
1791                 dst[count[class[i] - 1]++] = src[i];
1792                 src[i] = NULL;
1793         }
1794 }
1795
1796 /* Rule for xfrm_state:
1797  *
1798  * rule 1: select IPsec transport except AH
1799  * rule 2: select MIPv6 RO or inbound trigger
1800  * rule 3: select IPsec transport AH
1801  * rule 4: select IPsec tunnel
1802  * rule 5: others
1803  */
1804 static int __xfrm6_state_sort_cmp(const void *p)
1805 {
1806         const struct xfrm_state *v = p;
1807
1808         switch (v->props.mode) {
1809         case XFRM_MODE_TRANSPORT:
1810                 if (v->id.proto != IPPROTO_AH)
1811                         return 1;
1812                 else
1813                         return 3;
1814 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1815         case XFRM_MODE_ROUTEOPTIMIZATION:
1816         case XFRM_MODE_IN_TRIGGER:
1817                 return 2;
1818 #endif
1819         case XFRM_MODE_TUNNEL:
1820         case XFRM_MODE_BEET:
1821                 return 4;
1822         }
1823         return 5;
1824 }
1825
1826 /* Rule for xfrm_tmpl:
1827  *
1828  * rule 1: select IPsec transport
1829  * rule 2: select MIPv6 RO or inbound trigger
1830  * rule 3: select IPsec tunnel
1831  * rule 4: others
1832  */
1833 static int __xfrm6_tmpl_sort_cmp(const void *p)
1834 {
1835         const struct xfrm_tmpl *v = p;
1836
1837         switch (v->mode) {
1838         case XFRM_MODE_TRANSPORT:
1839                 return 1;
1840 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1841         case XFRM_MODE_ROUTEOPTIMIZATION:
1842         case XFRM_MODE_IN_TRIGGER:
1843                 return 2;
1844 #endif
1845         case XFRM_MODE_TUNNEL:
1846         case XFRM_MODE_BEET:
1847                 return 3;
1848         }
1849         return 4;
1850 }
1851 #else
1852 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
1853 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1854
1855 static inline void
1856 __xfrm6_sort(void **dst, void **src, int n,
1857              int (*cmp)(const void *p), int maxclass)
1858 {
1859         int i;
1860
1861         for (i = 0; i < n; i++)
1862                 dst[i] = src[i];
1863 }
1864 #endif /* CONFIG_IPV6 */
1865
1866 void
1867 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1868                unsigned short family)
1869 {
1870         int i;
1871
1872         if (family == AF_INET6)
1873                 __xfrm6_sort((void **)dst, (void **)src, n,
1874                              __xfrm6_tmpl_sort_cmp, 5);
1875         else
1876                 for (i = 0; i < n; i++)
1877                         dst[i] = src[i];
1878 }
1879
1880 void
1881 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1882                 unsigned short family)
1883 {
1884         int i;
1885
1886         if (family == AF_INET6)
1887                 __xfrm6_sort((void **)dst, (void **)src, n,
1888                              __xfrm6_state_sort_cmp, 6);
1889         else
1890                 for (i = 0; i < n; i++)
1891                         dst[i] = src[i];
1892 }
1893 #endif
1894
1895 /* Silly enough, but I'm lazy to build resolution list */
1896
1897 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1898 {
1899         int i;
1900
1901         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1902                 struct xfrm_state *x;
1903
1904                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1905                         if (x->km.seq == seq &&
1906                             (mark & x->mark.m) == x->mark.v &&
1907                             x->km.state == XFRM_STATE_ACQ) {
1908                                 xfrm_state_hold(x);
1909                                 return x;
1910                         }
1911                 }
1912         }
1913         return NULL;
1914 }
1915
1916 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1917 {
1918         struct xfrm_state *x;
1919
1920         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1921         x = __xfrm_find_acq_byseq(net, mark, seq);
1922         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1923         return x;
1924 }
1925 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1926
1927 u32 xfrm_get_acqseq(void)
1928 {
1929         u32 res;
1930         static atomic_t acqseq;
1931
1932         do {
1933                 res = atomic_inc_return(&acqseq);
1934         } while (!res);
1935
1936         return res;
1937 }
1938 EXPORT_SYMBOL(xfrm_get_acqseq);
1939
1940 int verify_spi_info(u8 proto, u32 min, u32 max)
1941 {
1942         switch (proto) {
1943         case IPPROTO_AH:
1944         case IPPROTO_ESP:
1945                 break;
1946
1947         case IPPROTO_COMP:
1948                 /* IPCOMP spi is 16-bits. */
1949                 if (max >= 0x10000)
1950                         return -EINVAL;
1951                 break;
1952
1953         default:
1954                 return -EINVAL;
1955         }
1956
1957         if (min > max)
1958                 return -EINVAL;
1959
1960         return 0;
1961 }
1962 EXPORT_SYMBOL(verify_spi_info);
1963
1964 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1965 {
1966         struct net *net = xs_net(x);
1967         unsigned int h;
1968         struct xfrm_state *x0;
1969         int err = -ENOENT;
1970         __be32 minspi = htonl(low);
1971         __be32 maxspi = htonl(high);
1972         u32 mark = x->mark.v & x->mark.m;
1973
1974         spin_lock_bh(&x->lock);
1975         if (x->km.state == XFRM_STATE_DEAD)
1976                 goto unlock;
1977
1978         err = 0;
1979         if (x->id.spi)
1980                 goto unlock;
1981
1982         err = -ENOENT;
1983
1984         if (minspi == maxspi) {
1985                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1986                 if (x0) {
1987                         xfrm_state_put(x0);
1988                         goto unlock;
1989                 }
1990                 x->id.spi = minspi;
1991         } else {
1992                 u32 spi = 0;
1993                 for (h = 0; h < high-low+1; h++) {
1994                         spi = low + prandom_u32()%(high-low+1);
1995                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1996                         if (x0 == NULL) {
1997                                 x->id.spi = htonl(spi);
1998                                 break;
1999                         }
2000                         xfrm_state_put(x0);
2001                 }
2002         }
2003         if (x->id.spi) {
2004                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2005                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2006                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2007                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2008
2009                 err = 0;
2010         }
2011
2012 unlock:
2013         spin_unlock_bh(&x->lock);
2014
2015         return err;
2016 }
2017 EXPORT_SYMBOL(xfrm_alloc_spi);
2018
2019 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2020                                       struct xfrm_address_filter *filter)
2021 {
2022         if (filter) {
2023                 if ((filter->family == AF_INET ||
2024                      filter->family == AF_INET6) &&
2025                     x->props.family != filter->family)
2026                         return false;
2027
2028                 return addr_match(&x->props.saddr, &filter->saddr,
2029                                   filter->splen) &&
2030                        addr_match(&x->id.daddr, &filter->daddr,
2031                                   filter->dplen);
2032         }
2033         return true;
2034 }
2035
2036 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2037                     int (*func)(struct xfrm_state *, int, void*),
2038                     void *data)
2039 {
2040         struct xfrm_state *state;
2041         struct xfrm_state_walk *x;
2042         int err = 0;
2043
2044         if (walk->seq != 0 && list_empty(&walk->all))
2045                 return 0;
2046
2047         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2048         if (list_empty(&walk->all))
2049                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2050         else
2051                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2052         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2053                 if (x->state == XFRM_STATE_DEAD)
2054                         continue;
2055                 state = container_of(x, struct xfrm_state, km);
2056                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2057                         continue;
2058                 if (!__xfrm_state_filter_match(state, walk->filter))
2059                         continue;
2060                 err = func(state, walk->seq, data);
2061                 if (err) {
2062                         list_move_tail(&walk->all, &x->all);
2063                         goto out;
2064                 }
2065                 walk->seq++;
2066         }
2067         if (walk->seq == 0) {
2068                 err = -ENOENT;
2069                 goto out;
2070         }
2071         list_del_init(&walk->all);
2072 out:
2073         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2074         return err;
2075 }
2076 EXPORT_SYMBOL(xfrm_state_walk);
2077
2078 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2079                           struct xfrm_address_filter *filter)
2080 {
2081         INIT_LIST_HEAD(&walk->all);
2082         walk->proto = proto;
2083         walk->state = XFRM_STATE_DEAD;
2084         walk->seq = 0;
2085         walk->filter = filter;
2086 }
2087 EXPORT_SYMBOL(xfrm_state_walk_init);
2088
2089 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2090 {
2091         kfree(walk->filter);
2092
2093         if (list_empty(&walk->all))
2094                 return;
2095
2096         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2097         list_del(&walk->all);
2098         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2099 }
2100 EXPORT_SYMBOL(xfrm_state_walk_done);
2101
2102 static void xfrm_replay_timer_handler(struct timer_list *t)
2103 {
2104         struct xfrm_state *x = from_timer(x, t, rtimer);
2105
2106         spin_lock(&x->lock);
2107
2108         if (x->km.state == XFRM_STATE_VALID) {
2109                 if (xfrm_aevent_is_on(xs_net(x)))
2110                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
2111                 else
2112                         x->xflags |= XFRM_TIME_DEFER;
2113         }
2114
2115         spin_unlock(&x->lock);
2116 }
2117
2118 static LIST_HEAD(xfrm_km_list);
2119
2120 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2121 {
2122         struct xfrm_mgr *km;
2123
2124         rcu_read_lock();
2125         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2126                 if (km->notify_policy)
2127                         km->notify_policy(xp, dir, c);
2128         rcu_read_unlock();
2129 }
2130
2131 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2132 {
2133         struct xfrm_mgr *km;
2134         rcu_read_lock();
2135         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2136                 if (km->notify)
2137                         km->notify(x, c);
2138         rcu_read_unlock();
2139 }
2140
2141 EXPORT_SYMBOL(km_policy_notify);
2142 EXPORT_SYMBOL(km_state_notify);
2143
2144 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2145 {
2146         struct km_event c;
2147
2148         c.data.hard = hard;
2149         c.portid = portid;
2150         c.event = XFRM_MSG_EXPIRE;
2151         km_state_notify(x, &c);
2152 }
2153
2154 EXPORT_SYMBOL(km_state_expired);
2155 /*
2156  * We send to all registered managers regardless of failure
2157  * We are happy with one success
2158 */
2159 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2160 {
2161         int err = -EINVAL, acqret;
2162         struct xfrm_mgr *km;
2163
2164         rcu_read_lock();
2165         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2166                 acqret = km->acquire(x, t, pol);
2167                 if (!acqret)
2168                         err = acqret;
2169         }
2170         rcu_read_unlock();
2171         return err;
2172 }
2173 EXPORT_SYMBOL(km_query);
2174
2175 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2176 {
2177         int err = -EINVAL;
2178         struct xfrm_mgr *km;
2179
2180         rcu_read_lock();
2181         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2182                 if (km->new_mapping)
2183                         err = km->new_mapping(x, ipaddr, sport);
2184                 if (!err)
2185                         break;
2186         }
2187         rcu_read_unlock();
2188         return err;
2189 }
2190 EXPORT_SYMBOL(km_new_mapping);
2191
2192 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2193 {
2194         struct km_event c;
2195
2196         c.data.hard = hard;
2197         c.portid = portid;
2198         c.event = XFRM_MSG_POLEXPIRE;
2199         km_policy_notify(pol, dir, &c);
2200 }
2201 EXPORT_SYMBOL(km_policy_expired);
2202
2203 #ifdef CONFIG_XFRM_MIGRATE
2204 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2205                const struct xfrm_migrate *m, int num_migrate,
2206                const struct xfrm_kmaddress *k,
2207                const struct xfrm_encap_tmpl *encap)
2208 {
2209         int err = -EINVAL;
2210         int ret;
2211         struct xfrm_mgr *km;
2212
2213         rcu_read_lock();
2214         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2215                 if (km->migrate) {
2216                         ret = km->migrate(sel, dir, type, m, num_migrate, k,
2217                                           encap);
2218                         if (!ret)
2219                                 err = ret;
2220                 }
2221         }
2222         rcu_read_unlock();
2223         return err;
2224 }
2225 EXPORT_SYMBOL(km_migrate);
2226 #endif
2227
2228 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2229 {
2230         int err = -EINVAL;
2231         int ret;
2232         struct xfrm_mgr *km;
2233
2234         rcu_read_lock();
2235         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2236                 if (km->report) {
2237                         ret = km->report(net, proto, sel, addr);
2238                         if (!ret)
2239                                 err = ret;
2240                 }
2241         }
2242         rcu_read_unlock();
2243         return err;
2244 }
2245 EXPORT_SYMBOL(km_report);
2246
2247 static bool km_is_alive(const struct km_event *c)
2248 {
2249         struct xfrm_mgr *km;
2250         bool is_alive = false;
2251
2252         rcu_read_lock();
2253         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2254                 if (km->is_alive && km->is_alive(c)) {
2255                         is_alive = true;
2256                         break;
2257                 }
2258         }
2259         rcu_read_unlock();
2260
2261         return is_alive;
2262 }
2263
2264 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
2265 {
2266         int err;
2267         u8 *data;
2268         struct xfrm_mgr *km;
2269         struct xfrm_policy *pol = NULL;
2270
2271         if (in_compat_syscall())
2272                 return -EOPNOTSUPP;
2273
2274         if (!optval && !optlen) {
2275                 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2276                 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2277                 __sk_dst_reset(sk);
2278                 return 0;
2279         }
2280
2281         if (optlen <= 0 || optlen > PAGE_SIZE)
2282                 return -EMSGSIZE;
2283
2284         data = memdup_user(optval, optlen);
2285         if (IS_ERR(data))
2286                 return PTR_ERR(data);
2287
2288         err = -EINVAL;
2289         rcu_read_lock();
2290         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2291                 pol = km->compile_policy(sk, optname, data,
2292                                          optlen, &err);
2293                 if (err >= 0)
2294                         break;
2295         }
2296         rcu_read_unlock();
2297
2298         if (err >= 0) {
2299                 xfrm_sk_policy_insert(sk, err, pol);
2300                 xfrm_pol_put(pol);
2301                 __sk_dst_reset(sk);
2302                 err = 0;
2303         }
2304
2305         kfree(data);
2306         return err;
2307 }
2308 EXPORT_SYMBOL(xfrm_user_policy);
2309
2310 static DEFINE_SPINLOCK(xfrm_km_lock);
2311
2312 int xfrm_register_km(struct xfrm_mgr *km)
2313 {
2314         spin_lock_bh(&xfrm_km_lock);
2315         list_add_tail_rcu(&km->list, &xfrm_km_list);
2316         spin_unlock_bh(&xfrm_km_lock);
2317         return 0;
2318 }
2319 EXPORT_SYMBOL(xfrm_register_km);
2320
2321 int xfrm_unregister_km(struct xfrm_mgr *km)
2322 {
2323         spin_lock_bh(&xfrm_km_lock);
2324         list_del_rcu(&km->list);
2325         spin_unlock_bh(&xfrm_km_lock);
2326         synchronize_rcu();
2327         return 0;
2328 }
2329 EXPORT_SYMBOL(xfrm_unregister_km);
2330
2331 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2332 {
2333         int err = 0;
2334
2335         if (WARN_ON(afinfo->family >= NPROTO))
2336                 return -EAFNOSUPPORT;
2337
2338         spin_lock_bh(&xfrm_state_afinfo_lock);
2339         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2340                 err = -EEXIST;
2341         else
2342                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2343         spin_unlock_bh(&xfrm_state_afinfo_lock);
2344         return err;
2345 }
2346 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2347
2348 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2349 {
2350         int err = 0, family = afinfo->family;
2351
2352         if (WARN_ON(family >= NPROTO))
2353                 return -EAFNOSUPPORT;
2354
2355         spin_lock_bh(&xfrm_state_afinfo_lock);
2356         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2357                 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2358                         err = -EINVAL;
2359                 else
2360                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2361         }
2362         spin_unlock_bh(&xfrm_state_afinfo_lock);
2363         synchronize_rcu();
2364         return err;
2365 }
2366 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2367
2368 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2369 {
2370         if (unlikely(family >= NPROTO))
2371                 return NULL;
2372
2373         return rcu_dereference(xfrm_state_afinfo[family]);
2374 }
2375 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2376
2377 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2378 {
2379         struct xfrm_state_afinfo *afinfo;
2380         if (unlikely(family >= NPROTO))
2381                 return NULL;
2382         rcu_read_lock();
2383         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2384         if (unlikely(!afinfo))
2385                 rcu_read_unlock();
2386         return afinfo;
2387 }
2388
2389 void xfrm_flush_gc(void)
2390 {
2391         flush_work(&xfrm_state_gc_work);
2392 }
2393 EXPORT_SYMBOL(xfrm_flush_gc);
2394
2395 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2396 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2397 {
2398         if (x->tunnel) {
2399                 struct xfrm_state *t = x->tunnel;
2400
2401                 if (atomic_read(&t->tunnel_users) == 2)
2402                         xfrm_state_delete(t);
2403                 atomic_dec(&t->tunnel_users);
2404                 xfrm_state_put_sync(t);
2405                 x->tunnel = NULL;
2406         }
2407 }
2408 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2409
2410 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2411 {
2412         const struct xfrm_type *type = READ_ONCE(x->type);
2413         struct crypto_aead *aead;
2414         u32 blksize, net_adj = 0;
2415
2416         if (x->km.state != XFRM_STATE_VALID ||
2417             !type || type->proto != IPPROTO_ESP)
2418                 return mtu - x->props.header_len;
2419
2420         aead = x->data;
2421         blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2422
2423         switch (x->props.mode) {
2424         case XFRM_MODE_TRANSPORT:
2425         case XFRM_MODE_BEET:
2426                 if (x->props.family == AF_INET)
2427                         net_adj = sizeof(struct iphdr);
2428                 else if (x->props.family == AF_INET6)
2429                         net_adj = sizeof(struct ipv6hdr);
2430                 break;
2431         case XFRM_MODE_TUNNEL:
2432                 break;
2433         default:
2434                 WARN_ON_ONCE(1);
2435                 break;
2436         }
2437
2438         return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2439                  net_adj) & ~(blksize - 1)) + net_adj - 2;
2440 }
2441 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2442
2443 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2444 {
2445         const struct xfrm_mode *inner_mode;
2446         const struct xfrm_mode *outer_mode;
2447         int family = x->props.family;
2448         int err;
2449
2450         if (family == AF_INET &&
2451             xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
2452                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2453
2454         err = -EPROTONOSUPPORT;
2455
2456         if (x->sel.family != AF_UNSPEC) {
2457                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2458                 if (inner_mode == NULL)
2459                         goto error;
2460
2461                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2462                     family != x->sel.family)
2463                         goto error;
2464
2465                 x->inner_mode = *inner_mode;
2466         } else {
2467                 const struct xfrm_mode *inner_mode_iaf;
2468                 int iafamily = AF_INET;
2469
2470                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2471                 if (inner_mode == NULL)
2472                         goto error;
2473
2474                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2475                         goto error;
2476
2477                 x->inner_mode = *inner_mode;
2478
2479                 if (x->props.family == AF_INET)
2480                         iafamily = AF_INET6;
2481
2482                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2483                 if (inner_mode_iaf) {
2484                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2485                                 x->inner_mode_iaf = *inner_mode_iaf;
2486                 }
2487         }
2488
2489         x->type = xfrm_get_type(x->id.proto, family);
2490         if (x->type == NULL)
2491                 goto error;
2492
2493         x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2494
2495         err = x->type->init_state(x);
2496         if (err)
2497                 goto error;
2498
2499         outer_mode = xfrm_get_mode(x->props.mode, family);
2500         if (!outer_mode) {
2501                 err = -EPROTONOSUPPORT;
2502                 goto error;
2503         }
2504
2505         x->outer_mode = *outer_mode;
2506         if (init_replay) {
2507                 err = xfrm_init_replay(x);
2508                 if (err)
2509                         goto error;
2510         }
2511
2512 error:
2513         return err;
2514 }
2515
2516 EXPORT_SYMBOL(__xfrm_init_state);
2517
2518 int xfrm_init_state(struct xfrm_state *x)
2519 {
2520         int err;
2521
2522         err = __xfrm_init_state(x, true, false);
2523         if (!err)
2524                 x->km.state = XFRM_STATE_VALID;
2525
2526         return err;
2527 }
2528
2529 EXPORT_SYMBOL(xfrm_init_state);
2530
2531 int __net_init xfrm_state_init(struct net *net)
2532 {
2533         unsigned int sz;
2534
2535         if (net_eq(net, &init_net))
2536                 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2537                                               SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2538
2539         INIT_LIST_HEAD(&net->xfrm.state_all);
2540
2541         sz = sizeof(struct hlist_head) * 8;
2542
2543         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2544         if (!net->xfrm.state_bydst)
2545                 goto out_bydst;
2546         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2547         if (!net->xfrm.state_bysrc)
2548                 goto out_bysrc;
2549         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2550         if (!net->xfrm.state_byspi)
2551                 goto out_byspi;
2552         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2553
2554         net->xfrm.state_num = 0;
2555         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2556         spin_lock_init(&net->xfrm.xfrm_state_lock);
2557         return 0;
2558
2559 out_byspi:
2560         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2561 out_bysrc:
2562         xfrm_hash_free(net->xfrm.state_bydst, sz);
2563 out_bydst:
2564         return -ENOMEM;
2565 }
2566
2567 void xfrm_state_fini(struct net *net)
2568 {
2569         unsigned int sz;
2570
2571         flush_work(&net->xfrm.state_hash_work);
2572         flush_work(&xfrm_state_gc_work);
2573         xfrm_state_flush(net, 0, false, true);
2574
2575         WARN_ON(!list_empty(&net->xfrm.state_all));
2576
2577         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2578         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2579         xfrm_hash_free(net->xfrm.state_byspi, sz);
2580         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2581         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2582         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2583         xfrm_hash_free(net->xfrm.state_bydst, sz);
2584 }
2585
2586 #ifdef CONFIG_AUDITSYSCALL
2587 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2588                                      struct audit_buffer *audit_buf)
2589 {
2590         struct xfrm_sec_ctx *ctx = x->security;
2591         u32 spi = ntohl(x->id.spi);
2592
2593         if (ctx)
2594                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2595                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2596
2597         switch (x->props.family) {
2598         case AF_INET:
2599                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2600                                  &x->props.saddr.a4, &x->id.daddr.a4);
2601                 break;
2602         case AF_INET6:
2603                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2604                                  x->props.saddr.a6, x->id.daddr.a6);
2605                 break;
2606         }
2607
2608         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2609 }
2610
2611 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2612                                       struct audit_buffer *audit_buf)
2613 {
2614         const struct iphdr *iph4;
2615         const struct ipv6hdr *iph6;
2616
2617         switch (family) {
2618         case AF_INET:
2619                 iph4 = ip_hdr(skb);
2620                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2621                                  &iph4->saddr, &iph4->daddr);
2622                 break;
2623         case AF_INET6:
2624                 iph6 = ipv6_hdr(skb);
2625                 audit_log_format(audit_buf,
2626                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2627                                  &iph6->saddr, &iph6->daddr,
2628                                  iph6->flow_lbl[0] & 0x0f,
2629                                  iph6->flow_lbl[1],
2630                                  iph6->flow_lbl[2]);
2631                 break;
2632         }
2633 }
2634
2635 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2636 {
2637         struct audit_buffer *audit_buf;
2638
2639         audit_buf = xfrm_audit_start("SAD-add");
2640         if (audit_buf == NULL)
2641                 return;
2642         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2643         xfrm_audit_helper_sainfo(x, audit_buf);
2644         audit_log_format(audit_buf, " res=%u", result);
2645         audit_log_end(audit_buf);
2646 }
2647 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2648
2649 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2650 {
2651         struct audit_buffer *audit_buf;
2652
2653         audit_buf = xfrm_audit_start("SAD-delete");
2654         if (audit_buf == NULL)
2655                 return;
2656         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2657         xfrm_audit_helper_sainfo(x, audit_buf);
2658         audit_log_format(audit_buf, " res=%u", result);
2659         audit_log_end(audit_buf);
2660 }
2661 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2662
2663 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2664                                       struct sk_buff *skb)
2665 {
2666         struct audit_buffer *audit_buf;
2667         u32 spi;
2668
2669         audit_buf = xfrm_audit_start("SA-replay-overflow");
2670         if (audit_buf == NULL)
2671                 return;
2672         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2673         /* don't record the sequence number because it's inherent in this kind
2674          * of audit message */
2675         spi = ntohl(x->id.spi);
2676         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2677         audit_log_end(audit_buf);
2678 }
2679 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2680
2681 void xfrm_audit_state_replay(struct xfrm_state *x,
2682                              struct sk_buff *skb, __be32 net_seq)
2683 {
2684         struct audit_buffer *audit_buf;
2685         u32 spi;
2686
2687         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2688         if (audit_buf == NULL)
2689                 return;
2690         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2691         spi = ntohl(x->id.spi);
2692         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2693                          spi, spi, ntohl(net_seq));
2694         audit_log_end(audit_buf);
2695 }
2696 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2697
2698 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2699 {
2700         struct audit_buffer *audit_buf;
2701
2702         audit_buf = xfrm_audit_start("SA-notfound");
2703         if (audit_buf == NULL)
2704                 return;
2705         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2706         audit_log_end(audit_buf);
2707 }
2708 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2709
2710 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2711                                __be32 net_spi, __be32 net_seq)
2712 {
2713         struct audit_buffer *audit_buf;
2714         u32 spi;
2715
2716         audit_buf = xfrm_audit_start("SA-notfound");
2717         if (audit_buf == NULL)
2718                 return;
2719         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2720         spi = ntohl(net_spi);
2721         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2722                          spi, spi, ntohl(net_seq));
2723         audit_log_end(audit_buf);
2724 }
2725 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2726
2727 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2728                               struct sk_buff *skb, u8 proto)
2729 {
2730         struct audit_buffer *audit_buf;
2731         __be32 net_spi;
2732         __be32 net_seq;
2733
2734         audit_buf = xfrm_audit_start("SA-icv-failure");
2735         if (audit_buf == NULL)
2736                 return;
2737         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2738         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2739                 u32 spi = ntohl(net_spi);
2740                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2741                                  spi, spi, ntohl(net_seq));
2742         }
2743         audit_log_end(audit_buf);
2744 }
2745 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2746 #endif /* CONFIG_AUDITSYSCALL */