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