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 + 1;
 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                 x->geniv = orig->geniv;
1163                 if (!x->aead)
1164                         goto error;
1165         }
1166         if (orig->ealg) {
1167                 x->ealg = xfrm_algo_clone(orig->ealg);
1168                 if (!x->ealg)
1169                         goto error;
1170         }
1171         x->props.ealgo = orig->props.ealgo;
1172
1173         if (orig->calg) {
1174                 x->calg = xfrm_algo_clone(orig->calg);
1175                 if (!x->calg)
1176                         goto error;
1177         }
1178         x->props.calgo = orig->props.calgo;
1179
1180         if (orig->encap) {
1181                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1182                 if (!x->encap)
1183                         goto error;
1184         }
1185
1186         if (orig->coaddr) {
1187                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1188                                     GFP_KERNEL);
1189                 if (!x->coaddr)
1190                         goto error;
1191         }
1192
1193         if (orig->replay_esn) {
1194                 if (xfrm_replay_clone(x, orig))
1195                         goto error;
1196         }
1197
1198         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1199
1200         if (xfrm_init_state(x) < 0)
1201                 goto error;
1202
1203         x->props.flags = orig->props.flags;
1204         x->props.extra_flags = orig->props.extra_flags;
1205
1206         x->tfcpad = orig->tfcpad;
1207         x->replay_maxdiff = orig->replay_maxdiff;
1208         x->replay_maxage = orig->replay_maxage;
1209         x->curlft.add_time = orig->curlft.add_time;
1210         x->km.state = orig->km.state;
1211         x->km.seq = orig->km.seq;
1212         x->replay = orig->replay;
1213         x->preplay = orig->preplay;
1214
1215         return x;
1216
1217  error:
1218         xfrm_state_put(x);
1219 out:
1220         return NULL;
1221 }
1222
1223 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1224 {
1225         unsigned int h;
1226         struct xfrm_state *x = NULL;
1227
1228         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1229
1230         if (m->reqid) {
1231                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1232                                   m->reqid, m->old_family);
1233                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1234                         if (x->props.mode != m->mode ||
1235                             x->id.proto != m->proto)
1236                                 continue;
1237                         if (m->reqid && x->props.reqid != m->reqid)
1238                                 continue;
1239                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1240                                              m->old_family) ||
1241                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1242                                              m->old_family))
1243                                 continue;
1244                         xfrm_state_hold(x);
1245                         break;
1246                 }
1247         } else {
1248                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1249                                   m->old_family);
1250                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1251                         if (x->props.mode != m->mode ||
1252                             x->id.proto != m->proto)
1253                                 continue;
1254                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1255                                              m->old_family) ||
1256                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1257                                              m->old_family))
1258                                 continue;
1259                         xfrm_state_hold(x);
1260                         break;
1261                 }
1262         }
1263
1264         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1265
1266         return x;
1267 }
1268 EXPORT_SYMBOL(xfrm_migrate_state_find);
1269
1270 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1271                                       struct xfrm_migrate *m)
1272 {
1273         struct xfrm_state *xc;
1274
1275         xc = xfrm_state_clone(x);
1276         if (!xc)
1277                 return NULL;
1278
1279         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1280         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1281
1282         /* add state */
1283         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1284                 /* a care is needed when the destination address of the
1285                    state is to be updated as it is a part of triplet */
1286                 xfrm_state_insert(xc);
1287         } else {
1288                 if (xfrm_state_add(xc) < 0)
1289                         goto error;
1290         }
1291
1292         return xc;
1293 error:
1294         xfrm_state_put(xc);
1295         return NULL;
1296 }
1297 EXPORT_SYMBOL(xfrm_state_migrate);
1298 #endif
1299
1300 int xfrm_state_update(struct xfrm_state *x)
1301 {
1302         struct xfrm_state *x1, *to_put;
1303         int err;
1304         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1305         struct net *net = xs_net(x);
1306
1307         to_put = NULL;
1308
1309         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1310         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1311
1312         err = -ESRCH;
1313         if (!x1)
1314                 goto out;
1315
1316         if (xfrm_state_kern(x1)) {
1317                 to_put = x1;
1318                 err = -EEXIST;
1319                 goto out;
1320         }
1321
1322         if (x1->km.state == XFRM_STATE_ACQ) {
1323                 __xfrm_state_insert(x);
1324                 x = NULL;
1325         }
1326         err = 0;
1327
1328 out:
1329         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1330
1331         if (to_put)
1332                 xfrm_state_put(to_put);
1333
1334         if (err)
1335                 return err;
1336
1337         if (!x) {
1338                 xfrm_state_delete(x1);
1339                 xfrm_state_put(x1);
1340                 return 0;
1341         }
1342
1343         err = -EINVAL;
1344         spin_lock_bh(&x1->lock);
1345         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1346                 if (x->encap && x1->encap)
1347                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1348                 if (x->coaddr && x1->coaddr) {
1349                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1350                 }
1351                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1352                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1353                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1354                 x1->km.dying = 0;
1355
1356                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1357                 if (x1->curlft.use_time)
1358                         xfrm_state_check_expire(x1);
1359
1360                 err = 0;
1361                 x->km.state = XFRM_STATE_DEAD;
1362                 __xfrm_state_put(x);
1363         }
1364         spin_unlock_bh(&x1->lock);
1365
1366         xfrm_state_put(x1);
1367
1368         return err;
1369 }
1370 EXPORT_SYMBOL(xfrm_state_update);
1371
1372 int xfrm_state_check_expire(struct xfrm_state *x)
1373 {
1374         if (!x->curlft.use_time)
1375                 x->curlft.use_time = get_seconds();
1376
1377         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1378             x->curlft.packets >= x->lft.hard_packet_limit) {
1379                 x->km.state = XFRM_STATE_EXPIRED;
1380                 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1381                 return -EINVAL;
1382         }
1383
1384         if (!x->km.dying &&
1385             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1386              x->curlft.packets >= x->lft.soft_packet_limit)) {
1387                 x->km.dying = 1;
1388                 km_state_expired(x, 0, 0);
1389         }
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(xfrm_state_check_expire);
1393
1394 struct xfrm_state *
1395 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1396                   u8 proto, unsigned short family)
1397 {
1398         struct xfrm_state *x;
1399
1400         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1401         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1402         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1403         return x;
1404 }
1405 EXPORT_SYMBOL(xfrm_state_lookup);
1406
1407 struct xfrm_state *
1408 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1409                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1410                          u8 proto, unsigned short family)
1411 {
1412         struct xfrm_state *x;
1413
1414         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1415         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1416         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1417         return x;
1418 }
1419 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1420
1421 struct xfrm_state *
1422 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1423               u8 proto, const xfrm_address_t *daddr,
1424               const xfrm_address_t *saddr, int create, unsigned short family)
1425 {
1426         struct xfrm_state *x;
1427
1428         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1429         x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1430         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1431
1432         return x;
1433 }
1434 EXPORT_SYMBOL(xfrm_find_acq);
1435
1436 #ifdef CONFIG_XFRM_SUB_POLICY
1437 int
1438 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1439                unsigned short family, struct net *net)
1440 {
1441         int err = 0;
1442         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1443         if (!afinfo)
1444                 return -EAFNOSUPPORT;
1445
1446         spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1447         if (afinfo->tmpl_sort)
1448                 err = afinfo->tmpl_sort(dst, src, n);
1449         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1450         xfrm_state_put_afinfo(afinfo);
1451         return err;
1452 }
1453 EXPORT_SYMBOL(xfrm_tmpl_sort);
1454
1455 int
1456 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1457                 unsigned short family)
1458 {
1459         int err = 0;
1460         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1461         struct net *net = xs_net(*src);
1462
1463         if (!afinfo)
1464                 return -EAFNOSUPPORT;
1465
1466         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1467         if (afinfo->state_sort)
1468                 err = afinfo->state_sort(dst, src, n);
1469         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1470         xfrm_state_put_afinfo(afinfo);
1471         return err;
1472 }
1473 EXPORT_SYMBOL(xfrm_state_sort);
1474 #endif
1475
1476 /* Silly enough, but I'm lazy to build resolution list */
1477
1478 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1479 {
1480         int i;
1481
1482         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1483                 struct xfrm_state *x;
1484
1485                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1486                         if (x->km.seq == seq &&
1487                             (mark & x->mark.m) == x->mark.v &&
1488                             x->km.state == XFRM_STATE_ACQ) {
1489                                 xfrm_state_hold(x);
1490                                 return x;
1491                         }
1492                 }
1493         }
1494         return NULL;
1495 }
1496
1497 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1498 {
1499         struct xfrm_state *x;
1500
1501         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1502         x = __xfrm_find_acq_byseq(net, mark, seq);
1503         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1504         return x;
1505 }
1506 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1507
1508 u32 xfrm_get_acqseq(void)
1509 {
1510         u32 res;
1511         static atomic_t acqseq;
1512
1513         do {
1514                 res = atomic_inc_return(&acqseq);
1515         } while (!res);
1516
1517         return res;
1518 }
1519 EXPORT_SYMBOL(xfrm_get_acqseq);
1520
1521 int verify_spi_info(u8 proto, u32 min, u32 max)
1522 {
1523         switch (proto) {
1524         case IPPROTO_AH:
1525         case IPPROTO_ESP:
1526                 break;
1527
1528         case IPPROTO_COMP:
1529                 /* IPCOMP spi is 16-bits. */
1530                 if (max >= 0x10000)
1531                         return -EINVAL;
1532                 break;
1533
1534         default:
1535                 return -EINVAL;
1536         }
1537
1538         if (min > max)
1539                 return -EINVAL;
1540
1541         return 0;
1542 }
1543 EXPORT_SYMBOL(verify_spi_info);
1544
1545 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1546 {
1547         struct net *net = xs_net(x);
1548         unsigned int h;
1549         struct xfrm_state *x0;
1550         int err = -ENOENT;
1551         __be32 minspi = htonl(low);
1552         __be32 maxspi = htonl(high);
1553         u32 mark = x->mark.v & x->mark.m;
1554
1555         spin_lock_bh(&x->lock);
1556         if (x->km.state == XFRM_STATE_DEAD)
1557                 goto unlock;
1558
1559         err = 0;
1560         if (x->id.spi)
1561                 goto unlock;
1562
1563         err = -ENOENT;
1564
1565         if (minspi == maxspi) {
1566                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1567                 if (x0) {
1568                         xfrm_state_put(x0);
1569                         goto unlock;
1570                 }
1571                 x->id.spi = minspi;
1572         } else {
1573                 u32 spi = 0;
1574                 for (h = 0; h < high-low+1; h++) {
1575                         spi = low + prandom_u32()%(high-low+1);
1576                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1577                         if (x0 == NULL) {
1578                                 x->id.spi = htonl(spi);
1579                                 break;
1580                         }
1581                         xfrm_state_put(x0);
1582                 }
1583         }
1584         if (x->id.spi) {
1585                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1586                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1587                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1588                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1589
1590                 err = 0;
1591         }
1592
1593 unlock:
1594         spin_unlock_bh(&x->lock);
1595
1596         return err;
1597 }
1598 EXPORT_SYMBOL(xfrm_alloc_spi);
1599
1600 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1601                                       struct xfrm_address_filter *filter)
1602 {
1603         if (filter) {
1604                 if ((filter->family == AF_INET ||
1605                      filter->family == AF_INET6) &&
1606                     x->props.family != filter->family)
1607                         return false;
1608
1609                 return addr_match(&x->props.saddr, &filter->saddr,
1610                                   filter->splen) &&
1611                        addr_match(&x->id.daddr, &filter->daddr,
1612                                   filter->dplen);
1613         }
1614         return true;
1615 }
1616
1617 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1618                     int (*func)(struct xfrm_state *, int, void*),
1619                     void *data)
1620 {
1621         struct xfrm_state *state;
1622         struct xfrm_state_walk *x;
1623         int err = 0;
1624
1625         if (walk->seq != 0 && list_empty(&walk->all))
1626                 return 0;
1627
1628         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1629         if (list_empty(&walk->all))
1630                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1631         else
1632                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1633         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1634                 if (x->state == XFRM_STATE_DEAD)
1635                         continue;
1636                 state = container_of(x, struct xfrm_state, km);
1637                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1638                         continue;
1639                 if (!__xfrm_state_filter_match(state, walk->filter))
1640                         continue;
1641                 err = func(state, walk->seq, data);
1642                 if (err) {
1643                         list_move_tail(&walk->all, &x->all);
1644                         goto out;
1645                 }
1646                 walk->seq++;
1647         }
1648         if (walk->seq == 0) {
1649                 err = -ENOENT;
1650                 goto out;
1651         }
1652         list_del_init(&walk->all);
1653 out:
1654         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1655         return err;
1656 }
1657 EXPORT_SYMBOL(xfrm_state_walk);
1658
1659 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1660                           struct xfrm_address_filter *filter)
1661 {
1662         INIT_LIST_HEAD(&walk->all);
1663         walk->proto = proto;
1664         walk->state = XFRM_STATE_DEAD;
1665         walk->seq = 0;
1666         walk->filter = filter;
1667 }
1668 EXPORT_SYMBOL(xfrm_state_walk_init);
1669
1670 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1671 {
1672         kfree(walk->filter);
1673
1674         if (list_empty(&walk->all))
1675                 return;
1676
1677         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1678         list_del(&walk->all);
1679         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1680 }
1681 EXPORT_SYMBOL(xfrm_state_walk_done);
1682
1683 static void xfrm_replay_timer_handler(unsigned long data)
1684 {
1685         struct xfrm_state *x = (struct xfrm_state *)data;
1686
1687         spin_lock(&x->lock);
1688
1689         if (x->km.state == XFRM_STATE_VALID) {
1690                 if (xfrm_aevent_is_on(xs_net(x)))
1691                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1692                 else
1693                         x->xflags |= XFRM_TIME_DEFER;
1694         }
1695
1696         spin_unlock(&x->lock);
1697 }
1698
1699 static LIST_HEAD(xfrm_km_list);
1700
1701 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1702 {
1703         struct xfrm_mgr *km;
1704
1705         rcu_read_lock();
1706         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1707                 if (km->notify_policy)
1708                         km->notify_policy(xp, dir, c);
1709         rcu_read_unlock();
1710 }
1711
1712 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1713 {
1714         struct xfrm_mgr *km;
1715         rcu_read_lock();
1716         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1717                 if (km->notify)
1718                         km->notify(x, c);
1719         rcu_read_unlock();
1720 }
1721
1722 EXPORT_SYMBOL(km_policy_notify);
1723 EXPORT_SYMBOL(km_state_notify);
1724
1725 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1726 {
1727         struct km_event c;
1728
1729         c.data.hard = hard;
1730         c.portid = portid;
1731         c.event = XFRM_MSG_EXPIRE;
1732         km_state_notify(x, &c);
1733 }
1734
1735 EXPORT_SYMBOL(km_state_expired);
1736 /*
1737  * We send to all registered managers regardless of failure
1738  * We are happy with one success
1739 */
1740 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1741 {
1742         int err = -EINVAL, acqret;
1743         struct xfrm_mgr *km;
1744
1745         rcu_read_lock();
1746         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1747                 acqret = km->acquire(x, t, pol);
1748                 if (!acqret)
1749                         err = acqret;
1750         }
1751         rcu_read_unlock();
1752         return err;
1753 }
1754 EXPORT_SYMBOL(km_query);
1755
1756 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1757 {
1758         int err = -EINVAL;
1759         struct xfrm_mgr *km;
1760
1761         rcu_read_lock();
1762         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1763                 if (km->new_mapping)
1764                         err = km->new_mapping(x, ipaddr, sport);
1765                 if (!err)
1766                         break;
1767         }
1768         rcu_read_unlock();
1769         return err;
1770 }
1771 EXPORT_SYMBOL(km_new_mapping);
1772
1773 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1774 {
1775         struct km_event c;
1776
1777         c.data.hard = hard;
1778         c.portid = portid;
1779         c.event = XFRM_MSG_POLEXPIRE;
1780         km_policy_notify(pol, dir, &c);
1781 }
1782 EXPORT_SYMBOL(km_policy_expired);
1783
1784 #ifdef CONFIG_XFRM_MIGRATE
1785 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1786                const struct xfrm_migrate *m, int num_migrate,
1787                const struct xfrm_kmaddress *k)
1788 {
1789         int err = -EINVAL;
1790         int ret;
1791         struct xfrm_mgr *km;
1792
1793         rcu_read_lock();
1794         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1795                 if (km->migrate) {
1796                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1797                         if (!ret)
1798                                 err = ret;
1799                 }
1800         }
1801         rcu_read_unlock();
1802         return err;
1803 }
1804 EXPORT_SYMBOL(km_migrate);
1805 #endif
1806
1807 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1808 {
1809         int err = -EINVAL;
1810         int ret;
1811         struct xfrm_mgr *km;
1812
1813         rcu_read_lock();
1814         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1815                 if (km->report) {
1816                         ret = km->report(net, proto, sel, addr);
1817                         if (!ret)
1818                                 err = ret;
1819                 }
1820         }
1821         rcu_read_unlock();
1822         return err;
1823 }
1824 EXPORT_SYMBOL(km_report);
1825
1826 bool km_is_alive(const struct km_event *c)
1827 {
1828         struct xfrm_mgr *km;
1829         bool is_alive = false;
1830
1831         rcu_read_lock();
1832         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1833                 if (km->is_alive && km->is_alive(c)) {
1834                         is_alive = true;
1835                         break;
1836                 }
1837         }
1838         rcu_read_unlock();
1839
1840         return is_alive;
1841 }
1842 EXPORT_SYMBOL(km_is_alive);
1843
1844 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1845 {
1846         int err;
1847         u8 *data;
1848         struct xfrm_mgr *km;
1849         struct xfrm_policy *pol = NULL;
1850
1851 #ifdef CONFIG_COMPAT
1852         if (is_compat_task())
1853                 return -EOPNOTSUPP;
1854 #endif
1855
1856         if (!optval && !optlen) {
1857                 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
1858                 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
1859                 __sk_dst_reset(sk);
1860                 return 0;
1861         }
1862
1863         if (optlen <= 0 || optlen > PAGE_SIZE)
1864                 return -EMSGSIZE;
1865
1866         data = kmalloc(optlen, GFP_KERNEL);
1867         if (!data)
1868                 return -ENOMEM;
1869
1870         err = -EFAULT;
1871         if (copy_from_user(data, optval, optlen))
1872                 goto out;
1873
1874         err = -EINVAL;
1875         rcu_read_lock();
1876         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1877                 pol = km->compile_policy(sk, optname, data,
1878                                          optlen, &err);
1879                 if (err >= 0)
1880                         break;
1881         }
1882         rcu_read_unlock();
1883
1884         if (err >= 0) {
1885                 xfrm_sk_policy_insert(sk, err, pol);
1886                 xfrm_pol_put(pol);
1887                 __sk_dst_reset(sk);
1888                 err = 0;
1889         }
1890
1891 out:
1892         kfree(data);
1893         return err;
1894 }
1895 EXPORT_SYMBOL(xfrm_user_policy);
1896
1897 static DEFINE_SPINLOCK(xfrm_km_lock);
1898
1899 int xfrm_register_km(struct xfrm_mgr *km)
1900 {
1901         spin_lock_bh(&xfrm_km_lock);
1902         list_add_tail_rcu(&km->list, &xfrm_km_list);
1903         spin_unlock_bh(&xfrm_km_lock);
1904         return 0;
1905 }
1906 EXPORT_SYMBOL(xfrm_register_km);
1907
1908 int xfrm_unregister_km(struct xfrm_mgr *km)
1909 {
1910         spin_lock_bh(&xfrm_km_lock);
1911         list_del_rcu(&km->list);
1912         spin_unlock_bh(&xfrm_km_lock);
1913         synchronize_rcu();
1914         return 0;
1915 }
1916 EXPORT_SYMBOL(xfrm_unregister_km);
1917
1918 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1919 {
1920         int err = 0;
1921         if (unlikely(afinfo == NULL))
1922                 return -EINVAL;
1923         if (unlikely(afinfo->family >= NPROTO))
1924                 return -EAFNOSUPPORT;
1925         spin_lock_bh(&xfrm_state_afinfo_lock);
1926         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1927                 err = -EEXIST;
1928         else
1929                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1930         spin_unlock_bh(&xfrm_state_afinfo_lock);
1931         return err;
1932 }
1933 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1934
1935 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1936 {
1937         int err = 0;
1938         if (unlikely(afinfo == NULL))
1939                 return -EINVAL;
1940         if (unlikely(afinfo->family >= NPROTO))
1941                 return -EAFNOSUPPORT;
1942         spin_lock_bh(&xfrm_state_afinfo_lock);
1943         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1944                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1945                         err = -EINVAL;
1946                 else
1947                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1948         }
1949         spin_unlock_bh(&xfrm_state_afinfo_lock);
1950         synchronize_rcu();
1951         return err;
1952 }
1953 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1954
1955 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1956 {
1957         struct xfrm_state_afinfo *afinfo;
1958         if (unlikely(family >= NPROTO))
1959                 return NULL;
1960         rcu_read_lock();
1961         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1962         if (unlikely(!afinfo))
1963                 rcu_read_unlock();
1964         return afinfo;
1965 }
1966
1967 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1968 {
1969         rcu_read_unlock();
1970 }
1971
1972 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1973 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1974 {
1975         if (x->tunnel) {
1976                 struct xfrm_state *t = x->tunnel;
1977
1978                 if (atomic_read(&t->tunnel_users) == 2)
1979                         xfrm_state_delete(t);
1980                 atomic_dec(&t->tunnel_users);
1981                 xfrm_state_put(t);
1982                 x->tunnel = NULL;
1983         }
1984 }
1985 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1986
1987 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1988 {
1989         int res;
1990
1991         spin_lock_bh(&x->lock);
1992         if (x->km.state == XFRM_STATE_VALID &&
1993             x->type && x->type->get_mtu)
1994                 res = x->type->get_mtu(x, mtu);
1995         else
1996                 res = mtu - x->props.header_len;
1997         spin_unlock_bh(&x->lock);
1998         return res;
1999 }
2000
2001 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
2002 {
2003         struct xfrm_state_afinfo *afinfo;
2004         struct xfrm_mode *inner_mode;
2005         int family = x->props.family;
2006         int err;
2007
2008         err = -EAFNOSUPPORT;
2009         afinfo = xfrm_state_get_afinfo(family);
2010         if (!afinfo)
2011                 goto error;
2012
2013         err = 0;
2014         if (afinfo->init_flags)
2015                 err = afinfo->init_flags(x);
2016
2017         xfrm_state_put_afinfo(afinfo);
2018
2019         if (err)
2020                 goto error;
2021
2022         err = -EPROTONOSUPPORT;
2023
2024         if (x->sel.family != AF_UNSPEC) {
2025                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2026                 if (inner_mode == NULL)
2027                         goto error;
2028
2029                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2030                     family != x->sel.family) {
2031                         xfrm_put_mode(inner_mode);
2032                         goto error;
2033                 }
2034
2035                 x->inner_mode = inner_mode;
2036         } else {
2037                 struct xfrm_mode *inner_mode_iaf;
2038                 int iafamily = AF_INET;
2039
2040                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2041                 if (inner_mode == NULL)
2042                         goto error;
2043
2044                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2045                         xfrm_put_mode(inner_mode);
2046                         goto error;
2047                 }
2048                 x->inner_mode = inner_mode;
2049
2050                 if (x->props.family == AF_INET)
2051                         iafamily = AF_INET6;
2052
2053                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2054                 if (inner_mode_iaf) {
2055                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2056                                 x->inner_mode_iaf = inner_mode_iaf;
2057                         else
2058                                 xfrm_put_mode(inner_mode_iaf);
2059                 }
2060         }
2061
2062         x->type = xfrm_get_type(x->id.proto, family);
2063         if (x->type == NULL)
2064                 goto error;
2065
2066         err = x->type->init_state(x);
2067         if (err)
2068                 goto error;
2069
2070         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2071         if (x->outer_mode == NULL) {
2072                 err = -EPROTONOSUPPORT;
2073                 goto error;
2074         }
2075
2076         if (init_replay) {
2077                 err = xfrm_init_replay(x);
2078                 if (err)
2079                         goto error;
2080         }
2081
2082         x->km.state = XFRM_STATE_VALID;
2083
2084 error:
2085         return err;
2086 }
2087
2088 EXPORT_SYMBOL(__xfrm_init_state);
2089
2090 int xfrm_init_state(struct xfrm_state *x)
2091 {
2092         return __xfrm_init_state(x, true);
2093 }
2094
2095 EXPORT_SYMBOL(xfrm_init_state);
2096
2097 int __net_init xfrm_state_init(struct net *net)
2098 {
2099         unsigned int sz;
2100
2101         INIT_LIST_HEAD(&net->xfrm.state_all);
2102
2103         sz = sizeof(struct hlist_head) * 8;
2104
2105         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2106         if (!net->xfrm.state_bydst)
2107                 goto out_bydst;
2108         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2109         if (!net->xfrm.state_bysrc)
2110                 goto out_bysrc;
2111         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2112         if (!net->xfrm.state_byspi)
2113                 goto out_byspi;
2114         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2115
2116         net->xfrm.state_num = 0;
2117         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2118         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2119         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2120         spin_lock_init(&net->xfrm.xfrm_state_lock);
2121         return 0;
2122
2123 out_byspi:
2124         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2125 out_bysrc:
2126         xfrm_hash_free(net->xfrm.state_bydst, sz);
2127 out_bydst:
2128         return -ENOMEM;
2129 }
2130
2131 void xfrm_state_fini(struct net *net)
2132 {
2133         unsigned int sz;
2134
2135         flush_work(&net->xfrm.state_hash_work);
2136         xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2137         flush_work(&net->xfrm.state_gc_work);
2138
2139         WARN_ON(!list_empty(&net->xfrm.state_all));
2140
2141         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2142         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2143         xfrm_hash_free(net->xfrm.state_byspi, sz);
2144         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2145         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2146         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2147         xfrm_hash_free(net->xfrm.state_bydst, sz);
2148 }
2149
2150 #ifdef CONFIG_AUDITSYSCALL
2151 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2152                                      struct audit_buffer *audit_buf)
2153 {
2154         struct xfrm_sec_ctx *ctx = x->security;
2155         u32 spi = ntohl(x->id.spi);
2156
2157         if (ctx)
2158                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2159                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2160
2161         switch (x->props.family) {
2162         case AF_INET:
2163                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2164                                  &x->props.saddr.a4, &x->id.daddr.a4);
2165                 break;
2166         case AF_INET6:
2167                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2168                                  x->props.saddr.a6, x->id.daddr.a6);
2169                 break;
2170         }
2171
2172         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2173 }
2174
2175 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2176                                       struct audit_buffer *audit_buf)
2177 {
2178         const struct iphdr *iph4;
2179         const struct ipv6hdr *iph6;
2180
2181         switch (family) {
2182         case AF_INET:
2183                 iph4 = ip_hdr(skb);
2184                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2185                                  &iph4->saddr, &iph4->daddr);
2186                 break;
2187         case AF_INET6:
2188                 iph6 = ipv6_hdr(skb);
2189                 audit_log_format(audit_buf,
2190                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2191                                  &iph6->saddr, &iph6->daddr,
2192                                  iph6->flow_lbl[0] & 0x0f,
2193                                  iph6->flow_lbl[1],
2194                                  iph6->flow_lbl[2]);
2195                 break;
2196         }
2197 }
2198
2199 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2200 {
2201         struct audit_buffer *audit_buf;
2202
2203         audit_buf = xfrm_audit_start("SAD-add");
2204         if (audit_buf == NULL)
2205                 return;
2206         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2207         xfrm_audit_helper_sainfo(x, audit_buf);
2208         audit_log_format(audit_buf, " res=%u", result);
2209         audit_log_end(audit_buf);
2210 }
2211 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2212
2213 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2214 {
2215         struct audit_buffer *audit_buf;
2216
2217         audit_buf = xfrm_audit_start("SAD-delete");
2218         if (audit_buf == NULL)
2219                 return;
2220         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2221         xfrm_audit_helper_sainfo(x, audit_buf);
2222         audit_log_format(audit_buf, " res=%u", result);
2223         audit_log_end(audit_buf);
2224 }
2225 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2226
2227 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2228                                       struct sk_buff *skb)
2229 {
2230         struct audit_buffer *audit_buf;
2231         u32 spi;
2232
2233         audit_buf = xfrm_audit_start("SA-replay-overflow");
2234         if (audit_buf == NULL)
2235                 return;
2236         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2237         /* don't record the sequence number because it's inherent in this kind
2238          * of audit message */
2239         spi = ntohl(x->id.spi);
2240         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2241         audit_log_end(audit_buf);
2242 }
2243 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2244
2245 void xfrm_audit_state_replay(struct xfrm_state *x,
2246                              struct sk_buff *skb, __be32 net_seq)
2247 {
2248         struct audit_buffer *audit_buf;
2249         u32 spi;
2250
2251         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2252         if (audit_buf == NULL)
2253                 return;
2254         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2255         spi = ntohl(x->id.spi);
2256         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2257                          spi, spi, ntohl(net_seq));
2258         audit_log_end(audit_buf);
2259 }
2260 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2261
2262 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2263 {
2264         struct audit_buffer *audit_buf;
2265
2266         audit_buf = xfrm_audit_start("SA-notfound");
2267         if (audit_buf == NULL)
2268                 return;
2269         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2270         audit_log_end(audit_buf);
2271 }
2272 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2273
2274 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2275                                __be32 net_spi, __be32 net_seq)
2276 {
2277         struct audit_buffer *audit_buf;
2278         u32 spi;
2279
2280         audit_buf = xfrm_audit_start("SA-notfound");
2281         if (audit_buf == NULL)
2282                 return;
2283         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2284         spi = ntohl(net_spi);
2285         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2286                          spi, spi, ntohl(net_seq));
2287         audit_log_end(audit_buf);
2288 }
2289 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2290
2291 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2292                               struct sk_buff *skb, u8 proto)
2293 {
2294         struct audit_buffer *audit_buf;
2295         __be32 net_spi;
2296         __be32 net_seq;
2297
2298         audit_buf = xfrm_audit_start("SA-icv-failure");
2299         if (audit_buf == NULL)
2300                 return;
2301         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2302         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2303                 u32 spi = ntohl(net_spi);
2304                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2305                                  spi, spi, ntohl(net_seq));
2306         }
2307         audit_log_end(audit_buf);
2308 }
2309 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2310 #endif /* CONFIG_AUDITSYSCALL */