net/xfrm/xfrm_state.c

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