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 DEFINE_MUTEX(hash_resize_mutex);
 101
 102 static void xfrm_hash_resize(struct work_struct *work)
 103 {
 104         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 105         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
 106         unsigned long nsize, osize;
 107         unsigned int nhashmask, ohashmask;
 108         int i;
 109
 110         mutex_lock(&hash_resize_mutex);
 111
 112         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 113         ndst = xfrm_hash_alloc(nsize);
 114         if (!ndst)
 115                 goto out_unlock;
 116         nsrc = xfrm_hash_alloc(nsize);
 117         if (!nsrc) {
 118                 xfrm_hash_free(ndst, nsize);
 119                 goto out_unlock;
 120         }
 121         nspi = xfrm_hash_alloc(nsize);
 122         if (!nspi) {
 123                 xfrm_hash_free(ndst, nsize);
 124                 xfrm_hash_free(nsrc, nsize);
 125                 goto out_unlock;
 126         }
 127
 128         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 129
 130         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 131         for (i = net->xfrm.state_hmask; i >= 0; i--)
 132                 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
 133                                    nhashmask);
 134
 135         odst = net->xfrm.state_bydst;
 136         osrc = net->xfrm.state_bysrc;
 137         ospi = net->xfrm.state_byspi;
 138         ohashmask = net->xfrm.state_hmask;
 139
 140         net->xfrm.state_bydst = ndst;
 141         net->xfrm.state_bysrc = nsrc;
 142         net->xfrm.state_byspi = nspi;
 143         net->xfrm.state_hmask = nhashmask;
 144
 145         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 146
 147         osize = (ohashmask + 1) * sizeof(struct hlist_head);
 148         xfrm_hash_free(odst, osize);
 149         xfrm_hash_free(osrc, osize);
 150         xfrm_hash_free(ospi, osize);
 151
 152 out_unlock:
 153         mutex_unlock(&hash_resize_mutex);
 154 }
 155
 156 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
 157 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
 158
 159 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 160
 161 int __xfrm_state_delete(struct xfrm_state *x);
 162
 163 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 164 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 165
 166 static DEFINE_SPINLOCK(xfrm_type_lock);
 167 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 168 {
 169         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 170         const struct xfrm_type **typemap;
 171         int err = 0;
 172
 173         if (unlikely(afinfo == NULL))
 174                 return -EAFNOSUPPORT;
 175         typemap = afinfo->type_map;
 176         spin_lock_bh(&xfrm_type_lock);
 177
 178         if (likely(typemap[type->proto] == NULL))
 179                 typemap[type->proto] = type;
 180         else
 181                 err = -EEXIST;
 182         spin_unlock_bh(&xfrm_type_lock);
 183         xfrm_state_put_afinfo(afinfo);
 184         return err;
 185 }
 186 EXPORT_SYMBOL(xfrm_register_type);
 187
 188 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 189 {
 190         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 191         const struct xfrm_type **typemap;
 192         int err = 0;
 193
 194         if (unlikely(afinfo == NULL))
 195                 return -EAFNOSUPPORT;
 196         typemap = afinfo->type_map;
 197         spin_lock_bh(&xfrm_type_lock);
 198
 199         if (unlikely(typemap[type->proto] != type))
 200                 err = -ENOENT;
 201         else
 202                 typemap[type->proto] = NULL;
 203         spin_unlock_bh(&xfrm_type_lock);
 204         xfrm_state_put_afinfo(afinfo);
 205         return err;
 206 }
 207 EXPORT_SYMBOL(xfrm_unregister_type);
 208
 209 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 210 {
 211         struct xfrm_state_afinfo *afinfo;
 212         const struct xfrm_type **typemap;
 213         const struct xfrm_type *type;
 214         int modload_attempted = 0;
 215
 216 retry:
 217         afinfo = xfrm_state_get_afinfo(family);
 218         if (unlikely(afinfo == NULL))
 219                 return NULL;
 220         typemap = afinfo->type_map;
 221
 222         type = typemap[proto];
 223         if (unlikely(type && !try_module_get(type->owner)))
 224                 type = NULL;
 225         if (!type && !modload_attempted) {
 226                 xfrm_state_put_afinfo(afinfo);
 227                 request_module("xfrm-type-%d-%d", family, proto);
 228                 modload_attempted = 1;
 229                 goto retry;
 230         }
 231
 232         xfrm_state_put_afinfo(afinfo);
 233         return type;
 234 }
 235
 236 static void xfrm_put_type(const struct xfrm_type *type)
 237 {
 238         module_put(type->owner);
 239 }
 240
 241 static DEFINE_SPINLOCK(xfrm_mode_lock);
 242 int xfrm_register_mode(struct xfrm_mode *mode, int family)
 243 {
 244         struct xfrm_state_afinfo *afinfo;
 245         struct xfrm_mode **modemap;
 246         int err;
 247
 248         if (unlikely(mode->encap >= XFRM_MODE_MAX))
 249                 return -EINVAL;
 250
 251         afinfo = xfrm_state_get_afinfo(family);
 252         if (unlikely(afinfo == NULL))
 253                 return -EAFNOSUPPORT;
 254
 255         err = -EEXIST;
 256         modemap = afinfo->mode_map;
 257         spin_lock_bh(&xfrm_mode_lock);
 258         if (modemap[mode->encap])
 259                 goto out;
 260
 261         err = -ENOENT;
 262         if (!try_module_get(afinfo->owner))
 263                 goto out;
 264
 265         mode->afinfo = afinfo;
 266         modemap[mode->encap] = mode;
 267         err = 0;
 268
 269 out:
 270         spin_unlock_bh(&xfrm_mode_lock);
 271         xfrm_state_put_afinfo(afinfo);
 272         return err;
 273 }
 274 EXPORT_SYMBOL(xfrm_register_mode);
 275
 276 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
 277 {
 278         struct xfrm_state_afinfo *afinfo;
 279         struct xfrm_mode **modemap;
 280         int err;
 281
 282         if (unlikely(mode->encap >= XFRM_MODE_MAX))
 283                 return -EINVAL;
 284
 285         afinfo = xfrm_state_get_afinfo(family);
 286         if (unlikely(afinfo == NULL))
 287                 return -EAFNOSUPPORT;
 288
 289         err = -ENOENT;
 290         modemap = afinfo->mode_map;
 291         spin_lock_bh(&xfrm_mode_lock);
 292         if (likely(modemap[mode->encap] == mode)) {
 293                 modemap[mode->encap] = NULL;
 294                 module_put(mode->afinfo->owner);
 295                 err = 0;
 296         }
 297
 298         spin_unlock_bh(&xfrm_mode_lock);
 299         xfrm_state_put_afinfo(afinfo);
 300         return err;
 301 }
 302 EXPORT_SYMBOL(xfrm_unregister_mode);
 303
 304 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 305 {
 306         struct xfrm_state_afinfo *afinfo;
 307         struct xfrm_mode *mode;
 308         int modload_attempted = 0;
 309
 310         if (unlikely(encap >= XFRM_MODE_MAX))
 311                 return NULL;
 312
 313 retry:
 314         afinfo = xfrm_state_get_afinfo(family);
 315         if (unlikely(afinfo == NULL))
 316                 return NULL;
 317
 318         mode = afinfo->mode_map[encap];
 319         if (unlikely(mode && !try_module_get(mode->owner)))
 320                 mode = NULL;
 321         if (!mode && !modload_attempted) {
 322                 xfrm_state_put_afinfo(afinfo);
 323                 request_module("xfrm-mode-%d-%d", family, encap);
 324                 modload_attempted = 1;
 325                 goto retry;
 326         }
 327
 328         xfrm_state_put_afinfo(afinfo);
 329         return mode;
 330 }
 331
 332 static void xfrm_put_mode(struct xfrm_mode *mode)
 333 {
 334         module_put(mode->owner);
 335 }
 336
 337 static void xfrm_state_gc_destroy(struct xfrm_state *x)
 338 {
 339         tasklet_hrtimer_cancel(&x->mtimer);
 340         del_timer_sync(&x->rtimer);
 341         kfree(x->aalg);
 342         kfree(x->ealg);
 343         kfree(x->calg);
 344         kfree(x->encap);
 345         kfree(x->coaddr);
 346         kfree(x->replay_esn);
 347         kfree(x->preplay_esn);
 348         if (x->inner_mode)
 349                 xfrm_put_mode(x->inner_mode);
 350         if (x->inner_mode_iaf)
 351                 xfrm_put_mode(x->inner_mode_iaf);
 352         if (x->outer_mode)
 353                 xfrm_put_mode(x->outer_mode);
 354         if (x->type) {
 355                 x->type->destructor(x);
 356                 xfrm_put_type(x->type);
 357         }
 358         security_xfrm_state_free(x);
 359         kfree(x);
 360 }
 361
 362 static void xfrm_state_gc_task(struct work_struct *work)
 363 {
 364         struct net *net = container_of(work, struct net, xfrm.state_gc_work);
 365         struct xfrm_state *x;
 366         struct hlist_node *tmp;
 367         struct hlist_head gc_list;
 368
 369         spin_lock_bh(&xfrm_state_gc_lock);
 370         hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
 371         spin_unlock_bh(&xfrm_state_gc_lock);
 372
 373         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
 374                 xfrm_state_gc_destroy(x);
 375 }
 376
 377 static inline unsigned long make_jiffies(long secs)
 378 {
 379         if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
 380                 return MAX_SCHEDULE_TIMEOUT-1;
 381         else
 382                 return secs*HZ;
 383 }
 384
 385 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
 386 {
 387         struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
 388         struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
 389         unsigned long now = get_seconds();
 390         long next = LONG_MAX;
 391         int warn = 0;
 392         int err = 0;
 393
 394         spin_lock(&x->lock);
 395         if (x->km.state == XFRM_STATE_DEAD)
 396                 goto out;
 397         if (x->km.state == XFRM_STATE_EXPIRED)
 398                 goto expired;
 399         if (x->lft.hard_add_expires_seconds) {
 400                 long tmo = x->lft.hard_add_expires_seconds +
 401                         x->curlft.add_time - now;
 402                 if (tmo <= 0) {
 403                         if (x->xflags & XFRM_SOFT_EXPIRE) {
 404                                 /* enter hard expire without soft expire first?!
 405                                  * setting a new date could trigger this.
 406                                  * workarbound: fix x->curflt.add_time by below:
 407                                  */
 408                                 x->curlft.add_time = now - x->saved_tmo - 1;
 409                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 410                         } else
 411                                 goto expired;
 412                 }
 413                 if (tmo < next)
 414                         next = tmo;
 415         }
 416         if (x->lft.hard_use_expires_seconds) {
 417                 long tmo = x->lft.hard_use_expires_seconds +
 418                         (x->curlft.use_time ? : now) - now;
 419                 if (tmo <= 0)
 420                         goto expired;
 421                 if (tmo < next)
 422                         next = tmo;
 423         }
 424         if (x->km.dying)
 425                 goto resched;
 426         if (x->lft.soft_add_expires_seconds) {
 427                 long tmo = x->lft.soft_add_expires_seconds +
 428                         x->curlft.add_time - now;
 429                 if (tmo <= 0) {
 430                         warn = 1;
 431                         x->xflags &= ~XFRM_SOFT_EXPIRE;
 432                 } else if (tmo < next) {
 433                         next = tmo;
 434                         x->xflags |= XFRM_SOFT_EXPIRE;
 435                         x->saved_tmo = tmo;
 436                 }
 437         }
 438         if (x->lft.soft_use_expires_seconds) {
 439                 long tmo = x->lft.soft_use_expires_seconds +
 440                         (x->curlft.use_time ? : now) - now;
 441                 if (tmo <= 0)
 442                         warn = 1;
 443                 else if (tmo < next)
 444                         next = tmo;
 445         }
 446
 447         x->km.dying = warn;
 448         if (warn)
 449                 km_state_expired(x, 0, 0);
 450 resched:
 451         if (next != LONG_MAX) {
 452                 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
 453         }
 454
 455         goto out;
 456
 457 expired:
 458         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
 459                 x->km.state = XFRM_STATE_EXPIRED;
 460
 461         err = __xfrm_state_delete(x);
 462         if (!err)
 463                 km_state_expired(x, 1, 0);
 464
 465         xfrm_audit_state_delete(x, err ? 0 : 1,
 466                                 audit_get_loginuid(current),
 467                                 audit_get_sessionid(current), 0);
 468
 469 out:
 470         spin_unlock(&x->lock);
 471         return HRTIMER_NORESTART;
 472 }
 473
 474 static void xfrm_replay_timer_handler(unsigned long data);
 475
 476 struct xfrm_state *xfrm_state_alloc(struct net *net)
 477 {
 478         struct xfrm_state *x;
 479
 480         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
 481
 482         if (x) {
 483                 write_pnet(&x->xs_net, net);
 484                 atomic_set(&x->refcnt, 1);
 485                 atomic_set(&x->tunnel_users, 0);
 486                 INIT_LIST_HEAD(&x->km.all);
 487                 INIT_HLIST_NODE(&x->bydst);
 488                 INIT_HLIST_NODE(&x->bysrc);
 489                 INIT_HLIST_NODE(&x->byspi);
 490                 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
 491                                         CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
 492                 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
 493                                 (unsigned long)x);
 494                 x->curlft.add_time = get_seconds();
 495                 x->lft.soft_byte_limit = XFRM_INF;
 496                 x->lft.soft_packet_limit = XFRM_INF;
 497                 x->lft.hard_byte_limit = XFRM_INF;
 498                 x->lft.hard_packet_limit = XFRM_INF;
 499                 x->replay_maxage = 0;
 500                 x->replay_maxdiff = 0;
 501                 x->inner_mode = NULL;
 502                 x->inner_mode_iaf = NULL;
 503                 spin_lock_init(&x->lock);
 504         }
 505         return x;
 506 }
 507 EXPORT_SYMBOL(xfrm_state_alloc);
 508
 509 void __xfrm_state_destroy(struct xfrm_state *x)
 510 {
 511         struct net *net = xs_net(x);
 512
 513         WARN_ON(x->km.state != XFRM_STATE_DEAD);
 514
 515         spin_lock_bh(&xfrm_state_gc_lock);
 516         hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
 517         spin_unlock_bh(&xfrm_state_gc_lock);
 518         schedule_work(&net->xfrm.state_gc_work);
 519 }
 520 EXPORT_SYMBOL(__xfrm_state_destroy);
 521
 522 int __xfrm_state_delete(struct xfrm_state *x)
 523 {
 524         struct net *net = xs_net(x);
 525         int err = -ESRCH;
 526
 527         if (x->km.state != XFRM_STATE_DEAD) {
 528                 x->km.state = XFRM_STATE_DEAD;
 529                 spin_lock(&net->xfrm.xfrm_state_lock);
 530                 list_del(&x->km.all);
 531                 hlist_del(&x->bydst);
 532                 hlist_del(&x->bysrc);
 533                 if (x->id.spi)
 534                         hlist_del(&x->byspi);
 535                 net->xfrm.state_num--;
 536                 spin_unlock(&net->xfrm.xfrm_state_lock);
 537
 538                 /* All xfrm_state objects are created by xfrm_state_alloc.
 539                  * The xfrm_state_alloc call gives a reference, and that
 540                  * is what we are dropping here.
 541                  */
 542                 xfrm_state_put(x);
 543                 err = 0;
 544         }
 545
 546         return err;
 547 }
 548 EXPORT_SYMBOL(__xfrm_state_delete);
 549
 550 int xfrm_state_delete(struct xfrm_state *x)
 551 {
 552         int err;
 553
 554         spin_lock_bh(&x->lock);
 555         err = __xfrm_state_delete(x);
 556         spin_unlock_bh(&x->lock);
 557
 558         return err;
 559 }
 560 EXPORT_SYMBOL(xfrm_state_delete);
 561
 562 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 563 static inline int
 564 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 565 {
 566         int i, err = 0;
 567
 568         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 569                 struct xfrm_state *x;
 570
 571                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 572                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 573                            (err = security_xfrm_state_delete(x)) != 0) {
 574                                 xfrm_audit_state_delete(x, 0,
 575                                                         audit_info->loginuid,
 576                                                         audit_info->sessionid,
 577                                                         audit_info->secid);
 578                                 return err;
 579                         }
 580                 }
 581         }
 582
 583         return err;
 584 }
 585 #else
 586 static inline int
 587 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 588 {
 589         return 0;
 590 }
 591 #endif
 592
 593 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 594 {
 595         int i, err = 0, cnt = 0;
 596
 597         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 598         err = xfrm_state_flush_secctx_check(net, proto, audit_info);
 599         if (err)
 600                 goto out;
 601
 602         err = -ESRCH;
 603         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 604                 struct xfrm_state *x;
 605 restart:
 606                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 607                         if (!xfrm_state_kern(x) &&
 608                             xfrm_id_proto_match(x->id.proto, proto)) {
 609                                 xfrm_state_hold(x);
 610                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 611
 612                                 err = xfrm_state_delete(x);
 613                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 614                                                         audit_info->loginuid,
 615                                                         audit_info->sessionid,
 616                                                         audit_info->secid);
 617                                 xfrm_state_put(x);
 618                                 if (!err)
 619                                         cnt++;
 620
 621                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 622                                 goto restart;
 623                         }
 624                 }
 625         }
 626         if (cnt)
 627                 err = 0;
 628
 629 out:
 630         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 631         return err;
 632 }
 633 EXPORT_SYMBOL(xfrm_state_flush);
 634
 635 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 636 {
 637         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 638         si->sadcnt = net->xfrm.state_num;
 639         si->sadhcnt = net->xfrm.state_hmask;
 640         si->sadhmcnt = xfrm_state_hashmax;
 641         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 642 }
 643 EXPORT_SYMBOL(xfrm_sad_getinfo);
 644
 645 static int
 646 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 647                     const struct xfrm_tmpl *tmpl,
 648                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 649                     unsigned short family)
 650 {
 651         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 652         if (!afinfo)
 653                 return -1;
 654         afinfo->init_tempsel(&x->sel, fl);
 655
 656         if (family != tmpl->encap_family) {
 657                 xfrm_state_put_afinfo(afinfo);
 658                 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
 659                 if (!afinfo)
 660                         return -1;
 661         }
 662         afinfo->init_temprop(x, tmpl, daddr, saddr);
 663         xfrm_state_put_afinfo(afinfo);
 664         return 0;
 665 }
 666
 667 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
 668                                               const xfrm_address_t *daddr,
 669                                               __be32 spi, u8 proto,
 670                                               unsigned short family)
 671 {
 672         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 673         struct xfrm_state *x;
 674
 675         hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
 676                 if (x->props.family != family ||
 677                     x->id.spi       != spi ||
 678                     x->id.proto     != proto ||
 679                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
 680                         continue;
 681
 682                 if ((mark & x->mark.m) != x->mark.v)
 683                         continue;
 684                 xfrm_state_hold(x);
 685                 return x;
 686         }
 687
 688         return NULL;
 689 }
 690
 691 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 692                                                      const xfrm_address_t *daddr,
 693                                                      const xfrm_address_t *saddr,
 694                                                      u8 proto, unsigned short family)
 695 {
 696         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 697         struct xfrm_state *x;
 698
 699         hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
 700                 if (x->props.family != family ||
 701                     x->id.proto     != proto ||
 702                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
 703                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
 704                         continue;
 705
 706                 if ((mark & x->mark.m) != x->mark.v)
 707                         continue;
 708                 xfrm_state_hold(x);
 709                 return x;
 710         }
 711
 712         return NULL;
 713 }
 714
 715 static inline struct xfrm_state *
 716 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 717 {
 718         struct net *net = xs_net(x);
 719         u32 mark = x->mark.v & x->mark.m;
 720
 721         if (use_spi)
 722                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
 723                                            x->id.spi, x->id.proto, family);
 724         else
 725                 return __xfrm_state_lookup_byaddr(net, mark,
 726                                                   &x->id.daddr,
 727                                                   &x->props.saddr,
 728                                                   x->id.proto, family);
 729 }
 730
 731 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 732 {
 733         if (have_hash_collision &&
 734             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 735             net->xfrm.state_num > net->xfrm.state_hmask)
 736                 schedule_work(&net->xfrm.state_hash_work);
 737 }
 738
 739 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
 740                                const struct flowi *fl, unsigned short family,
 741                                struct xfrm_state **best, int *acq_in_progress,
 742                                int *error)
 743 {
 744         /* Resolution logic:
 745          * 1. There is a valid state with matching selector. Done.
 746          * 2. Valid state with inappropriate selector. Skip.
 747          *
 748          * Entering area of "sysdeps".
 749          *
 750          * 3. If state is not valid, selector is temporary, it selects
 751          *    only session which triggered previous resolution. Key
 752          *    manager will do something to install a state with proper
 753          *    selector.
 754          */
 755         if (x->km.state == XFRM_STATE_VALID) {
 756                 if ((x->sel.family &&
 757                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
 758                     !security_xfrm_state_pol_flow_match(x, pol, fl))
 759                         return;
 760
 761                 if (!*best ||
 762                     (*best)->km.dying > x->km.dying ||
 763                     ((*best)->km.dying == x->km.dying &&
 764                      (*best)->curlft.add_time < x->curlft.add_time))
 765                         *best = x;
 766         } else if (x->km.state == XFRM_STATE_ACQ) {
 767                 *acq_in_progress = 1;
 768         } else if (x->km.state == XFRM_STATE_ERROR ||
 769                    x->km.state == XFRM_STATE_EXPIRED) {
 770                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
 771                     security_xfrm_state_pol_flow_match(x, pol, fl))
 772                         *error = -ESRCH;
 773         }
 774 }
 775
 776 struct xfrm_state *
 777 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 778                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
 779                 struct xfrm_policy *pol, int *err,
 780                 unsigned short family)
 781 {
 782         static xfrm_address_t saddr_wildcard = { };
 783         struct net *net = xp_net(pol);
 784         unsigned int h, h_wildcard;
 785         struct xfrm_state *x, *x0, *to_put;
 786         int acquire_in_progress = 0;
 787         int error = 0;
 788         struct xfrm_state *best = NULL;
 789         u32 mark = pol->mark.v & pol->mark.m;
 790         unsigned short encap_family = tmpl->encap_family;
 791
 792         to_put = NULL;
 793
 794         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 795         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
 796         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
 797                 if (x->props.family == encap_family &&
 798                     x->props.reqid == tmpl->reqid &&
 799                     (mark & x->mark.m) == x->mark.v &&
 800                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 801                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
 802                     tmpl->mode == x->props.mode &&
 803                     tmpl->id.proto == x->id.proto &&
 804                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 805                         xfrm_state_look_at(pol, x, fl, encap_family,
 806                                            &best, &acquire_in_progress, &error);
 807         }
 808         if (best || acquire_in_progress)
 809                 goto found;
 810
 811         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
 812         hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
 813                 if (x->props.family == encap_family &&
 814                     x->props.reqid == tmpl->reqid &&
 815                     (mark & x->mark.m) == x->mark.v &&
 816                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 817                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
 818                     tmpl->mode == x->props.mode &&
 819                     tmpl->id.proto == x->id.proto &&
 820                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 821                         xfrm_state_look_at(pol, x, fl, encap_family,
 822                                            &best, &acquire_in_progress, &error);
 823         }
 824
 825 found:
 826         x = best;
 827         if (!x && !error && !acquire_in_progress) {
 828                 if (tmpl->id.spi &&
 829                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
 830                                               tmpl->id.proto, encap_family)) != NULL) {
 831                         to_put = x0;
 832                         error = -EEXIST;
 833                         goto out;
 834                 }
 835                 x = xfrm_state_alloc(net);
 836                 if (x == NULL) {
 837                         error = -ENOMEM;
 838                         goto out;
 839                 }
 840                 /* Initialize temporary state matching only
 841                  * to current session. */
 842                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
 843                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
 844
 845                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
 846                 if (error) {
 847                         x->km.state = XFRM_STATE_DEAD;
 848                         to_put = x;
 849                         x = NULL;
 850                         goto out;
 851                 }
 852
 853                 if (km_query(x, tmpl, pol) == 0) {
 854                         x->km.state = XFRM_STATE_ACQ;
 855                         list_add(&x->km.all, &net->xfrm.state_all);
 856                         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 857                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
 858                         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 859                         if (x->id.spi) {
 860                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
 861                                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 862                         }
 863                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
 864                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
 865                         net->xfrm.state_num++;
 866                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 867                 } else {
 868                         x->km.state = XFRM_STATE_DEAD;
 869                         to_put = x;
 870                         x = NULL;
 871                         error = -ESRCH;
 872                 }
 873         }
 874 out:
 875         if (x)
 876                 xfrm_state_hold(x);
 877         else
 878                 *err = acquire_in_progress ? -EAGAIN : error;
 879         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 880         if (to_put)
 881                 xfrm_state_put(to_put);
 882         return x;
 883 }
 884
 885 struct xfrm_state *
 886 xfrm_stateonly_find(struct net *net, u32 mark,
 887                     xfrm_address_t *daddr, xfrm_address_t *saddr,
 888                     unsigned short family, u8 mode, u8 proto, u32 reqid)
 889 {
 890         unsigned int h;
 891         struct xfrm_state *rx = NULL, *x = NULL;
 892
 893         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 894         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 895         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
 896                 if (x->props.family == family &&
 897                     x->props.reqid == reqid &&
 898                     (mark & x->mark.m) == x->mark.v &&
 899                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 900                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 901                     mode == x->props.mode &&
 902                     proto == x->id.proto &&
 903                     x->km.state == XFRM_STATE_VALID) {
 904                         rx = x;
 905                         break;
 906                 }
 907         }
 908
 909         if (rx)
 910                 xfrm_state_hold(rx);
 911         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 912
 913
 914         return rx;
 915 }
 916 EXPORT_SYMBOL(xfrm_stateonly_find);
 917
 918 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
 919                                               unsigned short family)
 920 {
 921         struct xfrm_state *x;
 922         struct xfrm_state_walk *w;
 923
 924         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 925         list_for_each_entry(w, &net->xfrm.state_all, all) {
 926                 x = container_of(w, struct xfrm_state, km);
 927                 if (x->props.family != family ||
 928                         x->id.spi != spi)
 929                         continue;
 930
 931                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 932                 xfrm_state_hold(x);
 933                 return x;
 934         }
 935         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 936         return NULL;
 937 }
 938 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
 939
 940 static void __xfrm_state_insert(struct xfrm_state *x)
 941 {
 942         struct net *net = xs_net(x);
 943         unsigned int h;
 944
 945         list_add(&x->km.all, &net->xfrm.state_all);
 946
 947         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
 948                           x->props.reqid, x->props.family);
 949         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 950
 951         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
 952         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 953
 954         if (x->id.spi) {
 955                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
 956                                   x->props.family);
 957
 958                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 959         }
 960
 961         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
 962         if (x->replay_maxage)
 963                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
 964
 965         net->xfrm.state_num++;
 966
 967         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 968 }
 969
 970 /* net->xfrm.xfrm_state_lock is held */
 971 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
 972 {
 973         struct net *net = xs_net(xnew);
 974         unsigned short family = xnew->props.family;
 975         u32 reqid = xnew->props.reqid;
 976         struct xfrm_state *x;
 977         unsigned int h;
 978         u32 mark = xnew->mark.v & xnew->mark.m;
 979
 980         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
 981         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
 982                 if (x->props.family     == family &&
 983                     x->props.reqid      == reqid &&
 984                     (mark & x->mark.m) == x->mark.v &&
 985                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
 986                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
 987                         x->genid++;
 988         }
 989 }
 990
 991 void xfrm_state_insert(struct xfrm_state *x)
 992 {
 993         struct net *net = xs_net(x);
 994
 995         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 996         __xfrm_state_bump_genids(x);
 997         __xfrm_state_insert(x);
 998         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 999 }
1000 EXPORT_SYMBOL(xfrm_state_insert);
1001
1002 /* net->xfrm.xfrm_state_lock is held */
1003 static struct xfrm_state *__find_acq_core(struct net *net,
1004                                           const struct xfrm_mark *m,
1005                                           unsigned short family, u8 mode,
1006                                           u32 reqid, u8 proto,
1007                                           const xfrm_address_t *daddr,
1008                                           const xfrm_address_t *saddr,
1009                                           int create)
1010 {
1011         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1012         struct xfrm_state *x;
1013         u32 mark = m->v & m->m;
1014
1015         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1016                 if (x->props.reqid  != reqid ||
1017                     x->props.mode   != mode ||
1018                     x->props.family != family ||
1019                     x->km.state     != XFRM_STATE_ACQ ||
1020                     x->id.spi       != 0 ||
1021                     x->id.proto     != proto ||
1022                     (mark & x->mark.m) != x->mark.v ||
1023                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1024                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1025                         continue;
1026
1027                 xfrm_state_hold(x);
1028                 return x;
1029         }
1030
1031         if (!create)
1032                 return NULL;
1033
1034         x = xfrm_state_alloc(net);
1035         if (likely(x)) {
1036                 switch (family) {
1037                 case AF_INET:
1038                         x->sel.daddr.a4 = daddr->a4;
1039                         x->sel.saddr.a4 = saddr->a4;
1040                         x->sel.prefixlen_d = 32;
1041                         x->sel.prefixlen_s = 32;
1042                         x->props.saddr.a4 = saddr->a4;
1043                         x->id.daddr.a4 = daddr->a4;
1044                         break;
1045
1046                 case AF_INET6:
1047                         *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
1048                         *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
1049                         x->sel.prefixlen_d = 128;
1050                         x->sel.prefixlen_s = 128;
1051                         *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
1052                         *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
1053                         break;
1054                 }
1055
1056                 x->km.state = XFRM_STATE_ACQ;
1057                 x->id.proto = proto;
1058                 x->props.family = family;
1059                 x->props.mode = mode;
1060                 x->props.reqid = reqid;
1061                 x->mark.v = m->v;
1062                 x->mark.m = m->m;
1063                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1064                 xfrm_state_hold(x);
1065                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1066                 list_add(&x->km.all, &net->xfrm.state_all);
1067                 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1068                 h = xfrm_src_hash(net, daddr, saddr, family);
1069                 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1070
1071                 net->xfrm.state_num++;
1072
1073                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1074         }
1075
1076         return x;
1077 }
1078
1079 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1080
1081 int xfrm_state_add(struct xfrm_state *x)
1082 {
1083         struct net *net = xs_net(x);
1084         struct xfrm_state *x1, *to_put;
1085         int family;
1086         int err;
1087         u32 mark = x->mark.v & x->mark.m;
1088         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1089
1090         family = x->props.family;
1091
1092         to_put = NULL;
1093
1094         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1095
1096         x1 = __xfrm_state_locate(x, use_spi, family);
1097         if (x1) {
1098                 to_put = x1;
1099                 x1 = NULL;
1100                 err = -EEXIST;
1101                 goto out;
1102         }
1103
1104         if (use_spi && x->km.seq) {
1105                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1106                 if (x1 && ((x1->id.proto != x->id.proto) ||
1107                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1108                         to_put = x1;
1109                         x1 = NULL;
1110                 }
1111         }
1112
1113         if (use_spi && !x1)
1114                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1115                                      x->props.reqid, x->id.proto,
1116                                      &x->id.daddr, &x->props.saddr, 0);
1117
1118         __xfrm_state_bump_genids(x);
1119         __xfrm_state_insert(x);
1120         err = 0;
1121
1122 out:
1123         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1124
1125         if (x1) {
1126                 xfrm_state_delete(x1);
1127                 xfrm_state_put(x1);
1128         }
1129
1130         if (to_put)
1131                 xfrm_state_put(to_put);
1132
1133         return err;
1134 }
1135 EXPORT_SYMBOL(xfrm_state_add);
1136
1137 #ifdef CONFIG_XFRM_MIGRATE
1138 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1139 {
1140         struct net *net = xs_net(orig);
1141         int err = -ENOMEM;
1142         struct xfrm_state *x = xfrm_state_alloc(net);
1143         if (!x)
1144                 goto out;
1145
1146         memcpy(&x->id, &orig->id, sizeof(x->id));
1147         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1148         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1149         x->props.mode = orig->props.mode;
1150         x->props.replay_window = orig->props.replay_window;
1151         x->props.reqid = orig->props.reqid;
1152         x->props.family = orig->props.family;
1153         x->props.saddr = orig->props.saddr;
1154
1155         if (orig->aalg) {
1156                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1157                 if (!x->aalg)
1158                         goto error;
1159         }
1160         x->props.aalgo = orig->props.aalgo;
1161
1162         if (orig->aead) {
1163                 x->aead = xfrm_algo_aead_clone(orig->aead);
1164                 if (!x->aead)
1165                         goto error;
1166         }
1167         if (orig->ealg) {
1168                 x->ealg = xfrm_algo_clone(orig->ealg);
1169                 if (!x->ealg)
1170                         goto error;
1171         }
1172         x->props.ealgo = orig->props.ealgo;
1173
1174         if (orig->calg) {
1175                 x->calg = xfrm_algo_clone(orig->calg);
1176                 if (!x->calg)
1177                         goto error;
1178         }
1179         x->props.calgo = orig->props.calgo;
1180
1181         if (orig->encap) {
1182                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1183                 if (!x->encap)
1184                         goto error;
1185         }
1186
1187         if (orig->coaddr) {
1188                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1189                                     GFP_KERNEL);
1190                 if (!x->coaddr)
1191                         goto error;
1192         }
1193
1194         if (orig->replay_esn) {
1195                 err = xfrm_replay_clone(x, orig);
1196                 if (err)
1197                         goto error;
1198         }
1199
1200         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1201
1202         err = xfrm_init_state(x);
1203         if (err)
1204                 goto error;
1205
1206         x->props.flags = orig->props.flags;
1207         x->props.extra_flags = orig->props.extra_flags;
1208
1209         x->tfcpad = orig->tfcpad;
1210         x->replay_maxdiff = orig->replay_maxdiff;
1211         x->replay_maxage = orig->replay_maxage;
1212         x->curlft.add_time = orig->curlft.add_time;
1213         x->km.state = orig->km.state;
1214         x->km.seq = orig->km.seq;
1215
1216         return x;
1217
1218  error:
1219         xfrm_state_put(x);
1220 out:
1221         if (errp)
1222                 *errp = err;
1223         return NULL;
1224 }
1225
1226 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1227 {
1228         unsigned int h;
1229         struct xfrm_state *x = NULL;
1230
1231         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1232
1233         if (m->reqid) {
1234                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1235                                   m->reqid, m->old_family);
1236                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1237                         if (x->props.mode != m->mode ||
1238                             x->id.proto != m->proto)
1239                                 continue;
1240                         if (m->reqid && x->props.reqid != m->reqid)
1241                                 continue;
1242                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1243                                              m->old_family) ||
1244                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1245                                              m->old_family))
1246                                 continue;
1247                         xfrm_state_hold(x);
1248                         break;
1249                 }
1250         } else {
1251                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1252                                   m->old_family);
1253                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1254                         if (x->props.mode != m->mode ||
1255                             x->id.proto != m->proto)
1256                                 continue;
1257                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1258                                              m->old_family) ||
1259                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1260                                              m->old_family))
1261                                 continue;
1262                         xfrm_state_hold(x);
1263                         break;
1264                 }
1265         }
1266
1267         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1268
1269         return x;
1270 }
1271 EXPORT_SYMBOL(xfrm_migrate_state_find);
1272
1273 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1274                                       struct xfrm_migrate *m)
1275 {
1276         struct xfrm_state *xc;
1277         int err;
1278
1279         xc = xfrm_state_clone(x, &err);
1280         if (!xc)
1281                 return NULL;
1282
1283         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1284         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1285
1286         /* add state */
1287         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1288                 /* a care is needed when the destination address of the
1289                    state is to be updated as it is a part of triplet */
1290                 xfrm_state_insert(xc);
1291         } else {
1292                 if ((err = xfrm_state_add(xc)) < 0)
1293                         goto error;
1294         }
1295
1296         return xc;
1297 error:
1298         xfrm_state_put(xc);
1299         return NULL;
1300 }
1301 EXPORT_SYMBOL(xfrm_state_migrate);
1302 #endif
1303
1304 int xfrm_state_update(struct xfrm_state *x)
1305 {
1306         struct xfrm_state *x1, *to_put;
1307         int err;
1308         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1309         struct net *net = xs_net(x);
1310
1311         to_put = NULL;
1312
1313         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1314         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1315
1316         err = -ESRCH;
1317         if (!x1)
1318                 goto out;
1319
1320         if (xfrm_state_kern(x1)) {
1321                 to_put = x1;
1322                 err = -EEXIST;
1323                 goto out;
1324         }
1325
1326         if (x1->km.state == XFRM_STATE_ACQ) {
1327                 __xfrm_state_insert(x);
1328                 x = NULL;
1329         }
1330         err = 0;
1331
1332 out:
1333         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1334
1335         if (to_put)
1336                 xfrm_state_put(to_put);
1337
1338         if (err)
1339                 return err;
1340
1341         if (!x) {
1342                 xfrm_state_delete(x1);
1343                 xfrm_state_put(x1);
1344                 return 0;
1345         }
1346
1347         err = -EINVAL;
1348         spin_lock_bh(&x1->lock);
1349         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1350                 if (x->encap && x1->encap)
1351                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1352                 if (x->coaddr && x1->coaddr) {
1353                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1354                 }
1355                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1356                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1357                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1358                 x1->km.dying = 0;
1359
1360                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1361                 if (x1->curlft.use_time)
1362                         xfrm_state_check_expire(x1);
1363
1364                 err = 0;
1365                 x->km.state = XFRM_STATE_DEAD;
1366                 __xfrm_state_put(x);
1367         }
1368         spin_unlock_bh(&x1->lock);
1369
1370         xfrm_state_put(x1);
1371
1372         return err;
1373 }
1374 EXPORT_SYMBOL(xfrm_state_update);
1375
1376 int xfrm_state_check_expire(struct xfrm_state *x)
1377 {
1378         if (!x->curlft.use_time)
1379                 x->curlft.use_time = get_seconds();
1380
1381         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1382             x->curlft.packets >= x->lft.hard_packet_limit) {
1383                 x->km.state = XFRM_STATE_EXPIRED;
1384                 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1385                 return -EINVAL;
1386         }
1387
1388         if (!x->km.dying &&
1389             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1390              x->curlft.packets >= x->lft.soft_packet_limit)) {
1391                 x->km.dying = 1;
1392                 km_state_expired(x, 0, 0);
1393         }
1394         return 0;
1395 }
1396 EXPORT_SYMBOL(xfrm_state_check_expire);
1397
1398 struct xfrm_state *
1399 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1400                   u8 proto, unsigned short family)
1401 {
1402         struct xfrm_state *x;
1403
1404         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1405         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1406         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1407         return x;
1408 }
1409 EXPORT_SYMBOL(xfrm_state_lookup);
1410
1411 struct xfrm_state *
1412 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1413                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1414                          u8 proto, unsigned short family)
1415 {
1416         struct xfrm_state *x;
1417
1418         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1419         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1420         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1421         return x;
1422 }
1423 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1424
1425 struct xfrm_state *
1426 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1427               u8 proto, const xfrm_address_t *daddr,
1428               const xfrm_address_t *saddr, int create, unsigned short family)
1429 {
1430         struct xfrm_state *x;
1431
1432         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1433         x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1434         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1435
1436         return x;
1437 }
1438 EXPORT_SYMBOL(xfrm_find_acq);
1439
1440 #ifdef CONFIG_XFRM_SUB_POLICY
1441 int
1442 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1443                unsigned short family, struct net *net)
1444 {
1445         int err = 0;
1446         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1447         if (!afinfo)
1448                 return -EAFNOSUPPORT;
1449
1450         spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1451         if (afinfo->tmpl_sort)
1452                 err = afinfo->tmpl_sort(dst, src, n);
1453         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1454         xfrm_state_put_afinfo(afinfo);
1455         return err;
1456 }
1457 EXPORT_SYMBOL(xfrm_tmpl_sort);
1458
1459 int
1460 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1461                 unsigned short family)
1462 {
1463         int err = 0;
1464         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1465         struct net *net = xs_net(*src);
1466
1467         if (!afinfo)
1468                 return -EAFNOSUPPORT;
1469
1470         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1471         if (afinfo->state_sort)
1472                 err = afinfo->state_sort(dst, src, n);
1473         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1474         xfrm_state_put_afinfo(afinfo);
1475         return err;
1476 }
1477 EXPORT_SYMBOL(xfrm_state_sort);
1478 #endif
1479
1480 /* Silly enough, but I'm lazy to build resolution list */
1481
1482 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1483 {
1484         int i;
1485
1486         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1487                 struct xfrm_state *x;
1488
1489                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1490                         if (x->km.seq == seq &&
1491                             (mark & x->mark.m) == x->mark.v &&
1492                             x->km.state == XFRM_STATE_ACQ) {
1493                                 xfrm_state_hold(x);
1494                                 return x;
1495                         }
1496                 }
1497         }
1498         return NULL;
1499 }
1500
1501 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1502 {
1503         struct xfrm_state *x;
1504
1505         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1506         x = __xfrm_find_acq_byseq(net, mark, seq);
1507         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1508         return x;
1509 }
1510 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1511
1512 u32 xfrm_get_acqseq(void)
1513 {
1514         u32 res;
1515         static atomic_t acqseq;
1516
1517         do {
1518                 res = atomic_inc_return(&acqseq);
1519         } while (!res);
1520
1521         return res;
1522 }
1523 EXPORT_SYMBOL(xfrm_get_acqseq);
1524
1525 int verify_spi_info(u8 proto, u32 min, u32 max)
1526 {
1527         switch (proto) {
1528         case IPPROTO_AH:
1529         case IPPROTO_ESP:
1530                 break;
1531
1532         case IPPROTO_COMP:
1533                 /* IPCOMP spi is 16-bits. */
1534                 if (max >= 0x10000)
1535                         return -EINVAL;
1536                 break;
1537
1538         default:
1539                 return -EINVAL;
1540         }
1541
1542         if (min > max)
1543                 return -EINVAL;
1544
1545         return 0;
1546 }
1547 EXPORT_SYMBOL(verify_spi_info);
1548
1549 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1550 {
1551         struct net *net = xs_net(x);
1552         unsigned int h;
1553         struct xfrm_state *x0;
1554         int err = -ENOENT;
1555         __be32 minspi = htonl(low);
1556         __be32 maxspi = htonl(high);
1557         u32 mark = x->mark.v & x->mark.m;
1558
1559         spin_lock_bh(&x->lock);
1560         if (x->km.state == XFRM_STATE_DEAD)
1561                 goto unlock;
1562
1563         err = 0;
1564         if (x->id.spi)
1565                 goto unlock;
1566
1567         err = -ENOENT;
1568
1569         if (minspi == maxspi) {
1570                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1571                 if (x0) {
1572                         xfrm_state_put(x0);
1573                         goto unlock;
1574                 }
1575                 x->id.spi = minspi;
1576         } else {
1577                 u32 spi = 0;
1578                 for (h = 0; h < high-low+1; h++) {
1579                         spi = low + prandom_u32()%(high-low+1);
1580                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1581                         if (x0 == NULL) {
1582                                 x->id.spi = htonl(spi);
1583                                 break;
1584                         }
1585                         xfrm_state_put(x0);
1586                 }
1587         }
1588         if (x->id.spi) {
1589                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1590                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1591                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1592                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1593
1594                 err = 0;
1595         }
1596
1597 unlock:
1598         spin_unlock_bh(&x->lock);
1599
1600         return err;
1601 }
1602 EXPORT_SYMBOL(xfrm_alloc_spi);
1603
1604 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1605                     int (*func)(struct xfrm_state *, int, void*),
1606                     void *data)
1607 {
1608         struct xfrm_state *state;
1609         struct xfrm_state_walk *x;
1610         int err = 0;
1611
1612         if (walk->seq != 0 && list_empty(&walk->all))
1613                 return 0;
1614
1615         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1616         if (list_empty(&walk->all))
1617                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1618         else
1619                 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1620         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1621                 if (x->state == XFRM_STATE_DEAD)
1622                         continue;
1623                 state = container_of(x, struct xfrm_state, km);
1624                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1625                         continue;
1626                 err = func(state, walk->seq, data);
1627                 if (err) {
1628                         list_move_tail(&walk->all, &x->all);
1629                         goto out;
1630                 }
1631                 walk->seq++;
1632         }
1633         if (walk->seq == 0) {
1634                 err = -ENOENT;
1635                 goto out;
1636         }
1637         list_del_init(&walk->all);
1638 out:
1639         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1640         return err;
1641 }
1642 EXPORT_SYMBOL(xfrm_state_walk);
1643
1644 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1645 {
1646         INIT_LIST_HEAD(&walk->all);
1647         walk->proto = proto;
1648         walk->state = XFRM_STATE_DEAD;
1649         walk->seq = 0;
1650 }
1651 EXPORT_SYMBOL(xfrm_state_walk_init);
1652
1653 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1654 {
1655         if (list_empty(&walk->all))
1656                 return;
1657
1658         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1659         list_del(&walk->all);
1660         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1661 }
1662 EXPORT_SYMBOL(xfrm_state_walk_done);
1663
1664 static void xfrm_replay_timer_handler(unsigned long data)
1665 {
1666         struct xfrm_state *x = (struct xfrm_state *)data;
1667
1668         spin_lock(&x->lock);
1669
1670         if (x->km.state == XFRM_STATE_VALID) {
1671                 if (xfrm_aevent_is_on(xs_net(x)))
1672                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1673                 else
1674                         x->xflags |= XFRM_TIME_DEFER;
1675         }
1676
1677         spin_unlock(&x->lock);
1678 }
1679
1680 static LIST_HEAD(xfrm_km_list);
1681
1682 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1683 {
1684         struct xfrm_mgr *km;
1685
1686         rcu_read_lock();
1687         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1688                 if (km->notify_policy)
1689                         km->notify_policy(xp, dir, c);
1690         rcu_read_unlock();
1691 }
1692
1693 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1694 {
1695         struct xfrm_mgr *km;
1696         rcu_read_lock();
1697         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1698                 if (km->notify)
1699                         km->notify(x, c);
1700         rcu_read_unlock();
1701 }
1702
1703 EXPORT_SYMBOL(km_policy_notify);
1704 EXPORT_SYMBOL(km_state_notify);
1705
1706 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1707 {
1708         struct km_event c;
1709
1710         c.data.hard = hard;
1711         c.portid = portid;
1712         c.event = XFRM_MSG_EXPIRE;
1713         km_state_notify(x, &c);
1714 }
1715
1716 EXPORT_SYMBOL(km_state_expired);
1717 /*
1718  * We send to all registered managers regardless of failure
1719  * We are happy with one success
1720 */
1721 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1722 {
1723         int err = -EINVAL, acqret;
1724         struct xfrm_mgr *km;
1725
1726         rcu_read_lock();
1727         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1728                 acqret = km->acquire(x, t, pol);
1729                 if (!acqret)
1730                         err = acqret;
1731         }
1732         rcu_read_unlock();
1733         return err;
1734 }
1735 EXPORT_SYMBOL(km_query);
1736
1737 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1738 {
1739         int err = -EINVAL;
1740         struct xfrm_mgr *km;
1741
1742         rcu_read_lock();
1743         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1744                 if (km->new_mapping)
1745                         err = km->new_mapping(x, ipaddr, sport);
1746                 if (!err)
1747                         break;
1748         }
1749         rcu_read_unlock();
1750         return err;
1751 }
1752 EXPORT_SYMBOL(km_new_mapping);
1753
1754 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1755 {
1756         struct km_event c;
1757
1758         c.data.hard = hard;
1759         c.portid = portid;
1760         c.event = XFRM_MSG_POLEXPIRE;
1761         km_policy_notify(pol, dir, &c);
1762 }
1763 EXPORT_SYMBOL(km_policy_expired);
1764
1765 #ifdef CONFIG_XFRM_MIGRATE
1766 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1767                const struct xfrm_migrate *m, int num_migrate,
1768                const struct xfrm_kmaddress *k)
1769 {
1770         int err = -EINVAL;
1771         int ret;
1772         struct xfrm_mgr *km;
1773
1774         rcu_read_lock();
1775         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1776                 if (km->migrate) {
1777                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1778                         if (!ret)
1779                                 err = ret;
1780                 }
1781         }
1782         rcu_read_unlock();
1783         return err;
1784 }
1785 EXPORT_SYMBOL(km_migrate);
1786 #endif
1787
1788 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1789 {
1790         int err = -EINVAL;
1791         int ret;
1792         struct xfrm_mgr *km;
1793
1794         rcu_read_lock();
1795         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1796                 if (km->report) {
1797                         ret = km->report(net, proto, sel, addr);
1798                         if (!ret)
1799                                 err = ret;
1800                 }
1801         }
1802         rcu_read_unlock();
1803         return err;
1804 }
1805 EXPORT_SYMBOL(km_report);
1806
1807 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1808 {
1809         int err;
1810         u8 *data;
1811         struct xfrm_mgr *km;
1812         struct xfrm_policy *pol = NULL;
1813
1814         if (optlen <= 0 || optlen > PAGE_SIZE)
1815                 return -EMSGSIZE;
1816
1817         data = kmalloc(optlen, GFP_KERNEL);
1818         if (!data)
1819                 return -ENOMEM;
1820
1821         err = -EFAULT;
1822         if (copy_from_user(data, optval, optlen))
1823                 goto out;
1824
1825         err = -EINVAL;
1826         rcu_read_lock();
1827         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1828                 pol = km->compile_policy(sk, optname, data,
1829                                          optlen, &err);
1830                 if (err >= 0)
1831                         break;
1832         }
1833         rcu_read_unlock();
1834
1835         if (err >= 0) {
1836                 xfrm_sk_policy_insert(sk, err, pol);
1837                 xfrm_pol_put(pol);
1838                 err = 0;
1839         }
1840
1841 out:
1842         kfree(data);
1843         return err;
1844 }
1845 EXPORT_SYMBOL(xfrm_user_policy);
1846
1847 static DEFINE_SPINLOCK(xfrm_km_lock);
1848
1849 int xfrm_register_km(struct xfrm_mgr *km)
1850 {
1851         spin_lock_bh(&xfrm_km_lock);
1852         list_add_tail_rcu(&km->list, &xfrm_km_list);
1853         spin_unlock_bh(&xfrm_km_lock);
1854         return 0;
1855 }
1856 EXPORT_SYMBOL(xfrm_register_km);
1857
1858 int xfrm_unregister_km(struct xfrm_mgr *km)
1859 {
1860         spin_lock_bh(&xfrm_km_lock);
1861         list_del_rcu(&km->list);
1862         spin_unlock_bh(&xfrm_km_lock);
1863         synchronize_rcu();
1864         return 0;
1865 }
1866 EXPORT_SYMBOL(xfrm_unregister_km);
1867
1868 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1869 {
1870         int err = 0;
1871         if (unlikely(afinfo == NULL))
1872                 return -EINVAL;
1873         if (unlikely(afinfo->family >= NPROTO))
1874                 return -EAFNOSUPPORT;
1875         spin_lock_bh(&xfrm_state_afinfo_lock);
1876         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1877                 err = -ENOBUFS;
1878         else
1879                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1880         spin_unlock_bh(&xfrm_state_afinfo_lock);
1881         return err;
1882 }
1883 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1884
1885 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1886 {
1887         int err = 0;
1888         if (unlikely(afinfo == NULL))
1889                 return -EINVAL;
1890         if (unlikely(afinfo->family >= NPROTO))
1891                 return -EAFNOSUPPORT;
1892         spin_lock_bh(&xfrm_state_afinfo_lock);
1893         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1894                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1895                         err = -EINVAL;
1896                 else
1897                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1898         }
1899         spin_unlock_bh(&xfrm_state_afinfo_lock);
1900         synchronize_rcu();
1901         return err;
1902 }
1903 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1904
1905 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1906 {
1907         struct xfrm_state_afinfo *afinfo;
1908         if (unlikely(family >= NPROTO))
1909                 return NULL;
1910         rcu_read_lock();
1911         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1912         if (unlikely(!afinfo))
1913                 rcu_read_unlock();
1914         return afinfo;
1915 }
1916
1917 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1918 {
1919         rcu_read_unlock();
1920 }
1921
1922 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1923 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1924 {
1925         if (x->tunnel) {
1926                 struct xfrm_state *t = x->tunnel;
1927
1928                 if (atomic_read(&t->tunnel_users) == 2)
1929                         xfrm_state_delete(t);
1930                 atomic_dec(&t->tunnel_users);
1931                 xfrm_state_put(t);
1932                 x->tunnel = NULL;
1933         }
1934 }
1935 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1936
1937 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1938 {
1939         int res;
1940
1941         spin_lock_bh(&x->lock);
1942         if (x->km.state == XFRM_STATE_VALID &&
1943             x->type && x->type->get_mtu)
1944                 res = x->type->get_mtu(x, mtu);
1945         else
1946                 res = mtu - x->props.header_len;
1947         spin_unlock_bh(&x->lock);
1948         return res;
1949 }
1950
1951 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1952 {
1953         struct xfrm_state_afinfo *afinfo;
1954         struct xfrm_mode *inner_mode;
1955         int family = x->props.family;
1956         int err;
1957
1958         err = -EAFNOSUPPORT;
1959         afinfo = xfrm_state_get_afinfo(family);
1960         if (!afinfo)
1961                 goto error;
1962
1963         err = 0;
1964         if (afinfo->init_flags)
1965                 err = afinfo->init_flags(x);
1966
1967         xfrm_state_put_afinfo(afinfo);
1968
1969         if (err)
1970                 goto error;
1971
1972         err = -EPROTONOSUPPORT;
1973
1974         if (x->sel.family != AF_UNSPEC) {
1975                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1976                 if (inner_mode == NULL)
1977                         goto error;
1978
1979                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1980                     family != x->sel.family) {
1981                         xfrm_put_mode(inner_mode);
1982                         goto error;
1983                 }
1984
1985                 x->inner_mode = inner_mode;
1986         } else {
1987                 struct xfrm_mode *inner_mode_iaf;
1988                 int iafamily = AF_INET;
1989
1990                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1991                 if (inner_mode == NULL)
1992                         goto error;
1993
1994                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1995                         xfrm_put_mode(inner_mode);
1996                         goto error;
1997                 }
1998                 x->inner_mode = inner_mode;
1999
2000                 if (x->props.family == AF_INET)
2001                         iafamily = AF_INET6;
2002
2003                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2004                 if (inner_mode_iaf) {
2005                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2006                                 x->inner_mode_iaf = inner_mode_iaf;
2007                         else
2008                                 xfrm_put_mode(inner_mode_iaf);
2009                 }
2010         }
2011
2012         x->type = xfrm_get_type(x->id.proto, family);
2013         if (x->type == NULL)
2014                 goto error;
2015
2016         err = x->type->init_state(x);
2017         if (err)
2018                 goto error;
2019
2020         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2021         if (x->outer_mode == NULL) {
2022                 err = -EPROTONOSUPPORT;
2023                 goto error;
2024         }
2025
2026         if (init_replay) {
2027                 err = xfrm_init_replay(x);
2028                 if (err)
2029                         goto error;
2030         }
2031
2032         x->km.state = XFRM_STATE_VALID;
2033
2034 error:
2035         return err;
2036 }
2037
2038 EXPORT_SYMBOL(__xfrm_init_state);
2039
2040 int xfrm_init_state(struct xfrm_state *x)
2041 {
2042         return __xfrm_init_state(x, true);
2043 }
2044
2045 EXPORT_SYMBOL(xfrm_init_state);
2046
2047 int __net_init xfrm_state_init(struct net *net)
2048 {
2049         unsigned int sz;
2050
2051         INIT_LIST_HEAD(&net->xfrm.state_all);
2052
2053         sz = sizeof(struct hlist_head) * 8;
2054
2055         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2056         if (!net->xfrm.state_bydst)
2057                 goto out_bydst;
2058         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2059         if (!net->xfrm.state_bysrc)
2060                 goto out_bysrc;
2061         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2062         if (!net->xfrm.state_byspi)
2063                 goto out_byspi;
2064         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2065
2066         net->xfrm.state_num = 0;
2067         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2068         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2069         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2070         spin_lock_init(&net->xfrm.xfrm_state_lock);
2071         return 0;
2072
2073 out_byspi:
2074         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2075 out_bysrc:
2076         xfrm_hash_free(net->xfrm.state_bydst, sz);
2077 out_bydst:
2078         return -ENOMEM;
2079 }
2080
2081 void xfrm_state_fini(struct net *net)
2082 {
2083         struct xfrm_audit audit_info;
2084         unsigned int sz;
2085
2086         flush_work(&net->xfrm.state_hash_work);
2087         audit_info.loginuid = INVALID_UID;
2088         audit_info.sessionid = (unsigned int)-1;
2089         audit_info.secid = 0;
2090         xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2091         flush_work(&net->xfrm.state_gc_work);
2092
2093         WARN_ON(!list_empty(&net->xfrm.state_all));
2094
2095         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2096         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2097         xfrm_hash_free(net->xfrm.state_byspi, sz);
2098         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2099         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2100         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2101         xfrm_hash_free(net->xfrm.state_bydst, sz);
2102 }
2103
2104 #ifdef CONFIG_AUDITSYSCALL
2105 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2106                                      struct audit_buffer *audit_buf)
2107 {
2108         struct xfrm_sec_ctx *ctx = x->security;
2109         u32 spi = ntohl(x->id.spi);
2110
2111         if (ctx)
2112                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2113                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2114
2115         switch (x->props.family) {
2116         case AF_INET:
2117                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2118                                  &x->props.saddr.a4, &x->id.daddr.a4);
2119                 break;
2120         case AF_INET6:
2121                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2122                                  x->props.saddr.a6, x->id.daddr.a6);
2123                 break;
2124         }
2125
2126         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2127 }
2128
2129 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2130                                       struct audit_buffer *audit_buf)
2131 {
2132         const struct iphdr *iph4;
2133         const struct ipv6hdr *iph6;
2134
2135         switch (family) {
2136         case AF_INET:
2137                 iph4 = ip_hdr(skb);
2138                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2139                                  &iph4->saddr, &iph4->daddr);
2140                 break;
2141         case AF_INET6:
2142                 iph6 = ipv6_hdr(skb);
2143                 audit_log_format(audit_buf,
2144                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2145                                  &iph6->saddr, &iph6->daddr,
2146                                  iph6->flow_lbl[0] & 0x0f,
2147                                  iph6->flow_lbl[1],
2148                                  iph6->flow_lbl[2]);
2149                 break;
2150         }
2151 }
2152
2153 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2154                           kuid_t auid, unsigned int sessionid, u32 secid)
2155 {
2156         struct audit_buffer *audit_buf;
2157
2158         audit_buf = xfrm_audit_start("SAD-add");
2159         if (audit_buf == NULL)
2160                 return;
2161         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2162         xfrm_audit_helper_sainfo(x, audit_buf);
2163         audit_log_format(audit_buf, " res=%u", result);
2164         audit_log_end(audit_buf);
2165 }
2166 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2167
2168 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2169                              kuid_t auid, unsigned int sessionid, u32 secid)
2170 {
2171         struct audit_buffer *audit_buf;
2172
2173         audit_buf = xfrm_audit_start("SAD-delete");
2174         if (audit_buf == NULL)
2175                 return;
2176         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2177         xfrm_audit_helper_sainfo(x, audit_buf);
2178         audit_log_format(audit_buf, " res=%u", result);
2179         audit_log_end(audit_buf);
2180 }
2181 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2182
2183 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2184                                       struct sk_buff *skb)
2185 {
2186         struct audit_buffer *audit_buf;
2187         u32 spi;
2188
2189         audit_buf = xfrm_audit_start("SA-replay-overflow");
2190         if (audit_buf == NULL)
2191                 return;
2192         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2193         /* don't record the sequence number because it's inherent in this kind
2194          * of audit message */
2195         spi = ntohl(x->id.spi);
2196         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2197         audit_log_end(audit_buf);
2198 }
2199 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2200
2201 void xfrm_audit_state_replay(struct xfrm_state *x,
2202                              struct sk_buff *skb, __be32 net_seq)
2203 {
2204         struct audit_buffer *audit_buf;
2205         u32 spi;
2206
2207         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2208         if (audit_buf == NULL)
2209                 return;
2210         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2211         spi = ntohl(x->id.spi);
2212         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2213                          spi, spi, ntohl(net_seq));
2214         audit_log_end(audit_buf);
2215 }
2216 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2217
2218 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2219 {
2220         struct audit_buffer *audit_buf;
2221
2222         audit_buf = xfrm_audit_start("SA-notfound");
2223         if (audit_buf == NULL)
2224                 return;
2225         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2226         audit_log_end(audit_buf);
2227 }
2228 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2229
2230 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2231                                __be32 net_spi, __be32 net_seq)
2232 {
2233         struct audit_buffer *audit_buf;
2234         u32 spi;
2235
2236         audit_buf = xfrm_audit_start("SA-notfound");
2237         if (audit_buf == NULL)
2238                 return;
2239         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2240         spi = ntohl(net_spi);
2241         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2242                          spi, spi, ntohl(net_seq));
2243         audit_log_end(audit_buf);
2244 }
2245 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2246
2247 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2248                               struct sk_buff *skb, u8 proto)
2249 {
2250         struct audit_buffer *audit_buf;
2251         __be32 net_spi;
2252         __be32 net_seq;
2253
2254         audit_buf = xfrm_audit_start("SA-icv-failure");
2255         if (audit_buf == NULL)
2256                 return;
2257         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2258         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2259                 u32 spi = ntohl(net_spi);
2260                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2261                                  spi, spi, ntohl(net_seq));
2262         }
2263         audit_log_end(audit_buf);
2264 }
2265 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2266 #endif /* CONFIG_AUDITSYSCALL */