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   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/interrupt.h>
  26 #include <linux/kernel.h>
  27
  28 #include "xfrm_hash.h"
  29
  30 /* Each xfrm_state may be linked to two tables:
  31
  32    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
  33    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
  34       destination/tunnel endpoint. (output)
  35  */
  36
  37 static DEFINE_SPINLOCK(xfrm_state_lock);
  38
  39 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  40 static unsigned int xfrm_state_genid;
  41
  42 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
  43 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
  44
  45 #ifdef CONFIG_AUDITSYSCALL
  46 static void xfrm_audit_state_replay(struct xfrm_state *x,
  47                                     struct sk_buff *skb, __be32 net_seq);
  48 #else
  49 #define xfrm_audit_state_replay(x, s, sq)       do { ; } while (0)
  50 #endif /* CONFIG_AUDITSYSCALL */
  51
  52 static inline unsigned int xfrm_dst_hash(struct net *net,
  53                                          xfrm_address_t *daddr,
  54                                          xfrm_address_t *saddr,
  55                                          u32 reqid,
  56                                          unsigned short family)
  57 {
  58         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  59 }
  60
  61 static inline unsigned int xfrm_src_hash(struct net *net,
  62                                          xfrm_address_t *daddr,
  63                                          xfrm_address_t *saddr,
  64                                          unsigned short family)
  65 {
  66         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  67 }
  68
  69 static inline unsigned int
  70 xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
  71 {
  72         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  73 }
  74
  75 static void xfrm_hash_transfer(struct hlist_head *list,
  76                                struct hlist_head *ndsttable,
  77                                struct hlist_head *nsrctable,
  78                                struct hlist_head *nspitable,
  79                                unsigned int nhashmask)
  80 {
  81         struct hlist_node *entry, *tmp;
  82         struct xfrm_state *x;
  83
  84         hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
  85                 unsigned int h;
  86
  87                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
  88                                     x->props.reqid, x->props.family,
  89                                     nhashmask);
  90                 hlist_add_head(&x->bydst, ndsttable+h);
  91
  92                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
  93                                     x->props.family,
  94                                     nhashmask);
  95                 hlist_add_head(&x->bysrc, nsrctable+h);
  96
  97                 if (x->id.spi) {
  98                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
  99                                             x->id.proto, x->props.family,
 100                                             nhashmask);
 101                         hlist_add_head(&x->byspi, nspitable+h);
 102                 }
 103         }
 104 }
 105
 106 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 107 {
 108         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 109 }
 110
 111 static DEFINE_MUTEX(hash_resize_mutex);
 112
 113 static void xfrm_hash_resize(struct work_struct *work)
 114 {
 115         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 116         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
 117         unsigned long nsize, osize;
 118         unsigned int nhashmask, ohashmask;
 119         int i;
 120
 121         mutex_lock(&hash_resize_mutex);
 122
 123         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 124         ndst = xfrm_hash_alloc(nsize);
 125         if (!ndst)
 126                 goto out_unlock;
 127         nsrc = xfrm_hash_alloc(nsize);
 128         if (!nsrc) {
 129                 xfrm_hash_free(ndst, nsize);
 130                 goto out_unlock;
 131         }
 132         nspi = xfrm_hash_alloc(nsize);
 133         if (!nspi) {
 134                 xfrm_hash_free(ndst, nsize);
 135                 xfrm_hash_free(nsrc, nsize);
 136                 goto out_unlock;
 137         }
 138
 139         spin_lock_bh(&xfrm_state_lock);
 140
 141         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 142         for (i = net->xfrm.state_hmask; i >= 0; i--)
 143                 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
 144                                    nhashmask);
 145
 146         odst = net->xfrm.state_bydst;
 147         osrc = net->xfrm.state_bysrc;
 148         ospi = net->xfrm.state_byspi;
 149         ohashmask = net->xfrm.state_hmask;
 150
 151         net->xfrm.state_bydst = ndst;
 152         net->xfrm.state_bysrc = nsrc;
 153         net->xfrm.state_byspi = nspi;
 154         net->xfrm.state_hmask = nhashmask;
 155
 156         spin_unlock_bh(&xfrm_state_lock);
 157
 158         osize = (ohashmask + 1) * sizeof(struct hlist_head);
 159         xfrm_hash_free(odst, osize);
 160         xfrm_hash_free(osrc, osize);
 161         xfrm_hash_free(ospi, osize);
 162
 163 out_unlock:
 164         mutex_unlock(&hash_resize_mutex);
 165 }
 166
 167 static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
 168 static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
 169
 170 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 171
 172 int __xfrm_state_delete(struct xfrm_state *x);
 173
 174 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 175 void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 176
 177 static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
 178 {
 179         struct xfrm_state_afinfo *afinfo;
 180         if (unlikely(family >= NPROTO))
 181                 return NULL;
 182         write_lock_bh(&xfrm_state_afinfo_lock);
 183         afinfo = xfrm_state_afinfo[family];
 184         if (unlikely(!afinfo))
 185                 write_unlock_bh(&xfrm_state_afinfo_lock);
 186         return afinfo;
 187 }
 188
 189 static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
 190         __releases(xfrm_state_afinfo_lock)
 191 {
 192         write_unlock_bh(&xfrm_state_afinfo_lock);
 193 }
 194
 195 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 196 {
 197         struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
 198         const struct xfrm_type **typemap;
 199         int err = 0;
 200
 201         if (unlikely(afinfo == NULL))
 202                 return -EAFNOSUPPORT;
 203         typemap = afinfo->type_map;
 204
 205         if (likely(typemap[type->proto] == NULL))
 206                 typemap[type->proto] = type;
 207         else
 208                 err = -EEXIST;
 209         xfrm_state_unlock_afinfo(afinfo);
 210         return err;
 211 }
 212 EXPORT_SYMBOL(xfrm_register_type);
 213
 214 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 215 {
 216         struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
 217         const struct xfrm_type **typemap;
 218         int err = 0;
 219
 220         if (unlikely(afinfo == NULL))
 221                 return -EAFNOSUPPORT;
 222         typemap = afinfo->type_map;
 223
 224         if (unlikely(typemap[type->proto] != type))
 225                 err = -ENOENT;
 226         else
 227                 typemap[type->proto] = NULL;
 228         xfrm_state_unlock_afinfo(afinfo);
 229         return err;
 230 }
 231 EXPORT_SYMBOL(xfrm_unregister_type);
 232
 233 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 234 {
 235         struct xfrm_state_afinfo *afinfo;
 236         const struct xfrm_type **typemap;
 237         const struct xfrm_type *type;
 238         int modload_attempted = 0;
 239
 240 retry:
 241         afinfo = xfrm_state_get_afinfo(family);
 242         if (unlikely(afinfo == NULL))
 243                 return NULL;
 244         typemap = afinfo->type_map;
 245
 246         type = typemap[proto];
 247         if (unlikely(type && !try_module_get(type->owner)))
 248                 type = NULL;
 249         if (!type && !modload_attempted) {
 250                 xfrm_state_put_afinfo(afinfo);
 251                 request_module("xfrm-type-%d-%d", family, proto);
 252                 modload_attempted = 1;
 253                 goto retry;
 254         }
 255
 256         xfrm_state_put_afinfo(afinfo);
 257         return type;
 258 }
 259
 260 static void xfrm_put_type(const struct xfrm_type *type)
 261 {
 262         module_put(type->owner);
 263 }
 264
 265 int xfrm_register_mode(struct xfrm_mode *mode, int family)
 266 {
 267         struct xfrm_state_afinfo *afinfo;
 268         struct xfrm_mode **modemap;
 269         int err;
 270
 271         if (unlikely(mode->encap >= XFRM_MODE_MAX))
 272                 return -EINVAL;
 273
 274         afinfo = xfrm_state_lock_afinfo(family);
 275         if (unlikely(afinfo == NULL))
 276                 return -EAFNOSUPPORT;
 277
 278         err = -EEXIST;
 279         modemap = afinfo->mode_map;
 280         if (modemap[mode->encap])
 281                 goto out;
 282
 283         err = -ENOENT;
 284         if (!try_module_get(afinfo->owner))
 285                 goto out;
 286
 287         mode->afinfo = afinfo;
 288         modemap[mode->encap] = mode;
 289         err = 0;
 290
 291 out:
 292         xfrm_state_unlock_afinfo(afinfo);
 293         return err;
 294 }
 295 EXPORT_SYMBOL(xfrm_register_mode);
 296
 297 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
 298 {
 299         struct xfrm_state_afinfo *afinfo;
 300         struct xfrm_mode **modemap;
 301         int err;
 302
 303         if (unlikely(mode->encap >= XFRM_MODE_MAX))
 304                 return -EINVAL;
 305
 306         afinfo = xfrm_state_lock_afinfo(family);
 307         if (unlikely(afinfo == NULL))
 308                 return -EAFNOSUPPORT;
 309
 310         err = -ENOENT;
 311         modemap = afinfo->mode_map;
 312         if (likely(modemap[mode->encap] == mode)) {
 313                 modemap[mode->encap] = NULL;
 314                 module_put(mode->afinfo->owner);
 315                 err = 0;
 316         }
 317
 318         xfrm_state_unlock_afinfo(afinfo);
 319         return err;
 320 }
 321 EXPORT_SYMBOL(xfrm_unregister_mode);
 322
 323 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 324 {
 325         struct xfrm_state_afinfo *afinfo;
 326         struct xfrm_mode *mode;
 327         int modload_attempted = 0;
 328
 329         if (unlikely(encap >= XFRM_MODE_MAX))
 330                 return NULL;
 331
 332 retry:
 333         afinfo = xfrm_state_get_afinfo(family);
 334         if (unlikely(afinfo == NULL))
 335                 return NULL;
 336
 337         mode = afinfo->mode_map[encap];
 338         if (unlikely(mode && !try_module_get(mode->owner)))
 339                 mode = NULL;
 340         if (!mode && !modload_attempted) {
 341                 xfrm_state_put_afinfo(afinfo);
 342                 request_module("xfrm-mode-%d-%d", family, encap);
 343                 modload_attempted = 1;
 344                 goto retry;
 345         }
 346
 347         xfrm_state_put_afinfo(afinfo);
 348         return mode;
 349 }
 350
 351 static void xfrm_put_mode(struct xfrm_mode *mode)
 352 {
 353         module_put(mode->owner);
 354 }
 355
 356 static void xfrm_state_gc_destroy(struct xfrm_state *x)
 357 {
 358         tasklet_hrtimer_cancel(&x->mtimer);
 359         del_timer_sync(&x->rtimer);
 360         kfree(x->aalg);
 361         kfree(x->ealg);
 362         kfree(x->calg);
 363         kfree(x->encap);
 364         kfree(x->coaddr);
 365         if (x->inner_mode)
 366                 xfrm_put_mode(x->inner_mode);
 367         if (x->inner_mode_iaf)
 368                 xfrm_put_mode(x->inner_mode_iaf);
 369         if (x->outer_mode)
 370                 xfrm_put_mode(x->outer_mode);
 371         if (x->type) {
 372                 x->type->destructor(x);
 373                 xfrm_put_type(x->type);
 374         }
 375         security_xfrm_state_free(x);
 376         kfree(x);
 377 }
 378
 379 static void xfrm_state_gc_task(struct work_struct *work)
 380 {
 381         struct net *net = container_of(work, struct net, xfrm.state_gc_work);
 382         struct xfrm_state *x;
 383         struct hlist_node *entry, *tmp;
 384         struct hlist_head gc_list;
 385
 386         spin_lock_bh(&xfrm_state_gc_lock);
 387         hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
 388         spin_unlock_bh(&xfrm_state_gc_lock);
 389
 390         hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
 391                 xfrm_state_gc_destroy(x);
 392
 393         wake_up(&net->xfrm.km_waitq);
 394 }
 395
 396 static inline unsigned long make_jiffies(long secs)
 397 {
 398         if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
 399                 return MAX_SCHEDULE_TIMEOUT-1;
 400         else
 401                 return secs*HZ;
 402 }
 403
 404 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
 405 {
 406         struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
 407         struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
 408         struct net *net = xs_net(x);
 409         unsigned long now = get_seconds();
 410         long next = LONG_MAX;
 411         int warn = 0;
 412         int err = 0;
 413
 414         spin_lock(&x->lock);
 415         if (x->km.state == XFRM_STATE_DEAD)
 416                 goto out;
 417         if (x->km.state == XFRM_STATE_EXPIRED)
 418                 goto expired;
 419         if (x->lft.hard_add_expires_seconds) {
 420                 long tmo = x->lft.hard_add_expires_seconds +
 421                         x->curlft.add_time - now;
 422                 if (tmo <= 0)
 423                         goto expired;
 424                 if (tmo < next)
 425                         next = tmo;
 426         }
 427         if (x->lft.hard_use_expires_seconds) {
 428                 long tmo = x->lft.hard_use_expires_seconds +
 429                         (x->curlft.use_time ? : now) - now;
 430                 if (tmo <= 0)
 431                         goto expired;
 432                 if (tmo < next)
 433                         next = tmo;
 434         }
 435         if (x->km.dying)
 436                 goto resched;
 437         if (x->lft.soft_add_expires_seconds) {
 438                 long tmo = x->lft.soft_add_expires_seconds +
 439                         x->curlft.add_time - now;
 440                 if (tmo <= 0)
 441                         warn = 1;
 442                 else if (tmo < next)
 443                         next = tmo;
 444         }
 445         if (x->lft.soft_use_expires_seconds) {
 446                 long tmo = x->lft.soft_use_expires_seconds +
 447                         (x->curlft.use_time ? : now) - now;
 448                 if (tmo <= 0)
 449                         warn = 1;
 450                 else if (tmo < next)
 451                         next = tmo;
 452         }
 453
 454         x->km.dying = warn;
 455         if (warn)
 456                 km_state_expired(x, 0, 0);
 457 resched:
 458         if (next != LONG_MAX){
 459                 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
 460         }
 461
 462         goto out;
 463
 464 expired:
 465         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
 466                 x->km.state = XFRM_STATE_EXPIRED;
 467                 wake_up(&net->xfrm.km_waitq);
 468                 next = 2;
 469                 goto resched;
 470         }
 471
 472         err = __xfrm_state_delete(x);
 473         if (!err && x->id.spi)
 474                 km_state_expired(x, 1, 0);
 475
 476         xfrm_audit_state_delete(x, err ? 0 : 1,
 477                                 audit_get_loginuid(current),
 478                                 audit_get_sessionid(current), 0);
 479
 480 out:
 481         spin_unlock(&x->lock);
 482         return HRTIMER_NORESTART;
 483 }
 484
 485 static void xfrm_replay_timer_handler(unsigned long data);
 486
 487 struct xfrm_state *xfrm_state_alloc(struct net *net)
 488 {
 489         struct xfrm_state *x;
 490
 491         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
 492
 493         if (x) {
 494                 write_pnet(&x->xs_net, net);
 495                 atomic_set(&x->refcnt, 1);
 496                 atomic_set(&x->tunnel_users, 0);
 497                 INIT_LIST_HEAD(&x->km.all);
 498                 INIT_HLIST_NODE(&x->bydst);
 499                 INIT_HLIST_NODE(&x->bysrc);
 500                 INIT_HLIST_NODE(&x->byspi);
 501                 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 502                 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
 503                                 (unsigned long)x);
 504                 x->curlft.add_time = get_seconds();
 505                 x->lft.soft_byte_limit = XFRM_INF;
 506                 x->lft.soft_packet_limit = XFRM_INF;
 507                 x->lft.hard_byte_limit = XFRM_INF;
 508                 x->lft.hard_packet_limit = XFRM_INF;
 509                 x->replay_maxage = 0;
 510                 x->replay_maxdiff = 0;
 511                 x->inner_mode = NULL;
 512                 x->inner_mode_iaf = NULL;
 513                 spin_lock_init(&x->lock);
 514         }
 515         return x;
 516 }
 517 EXPORT_SYMBOL(xfrm_state_alloc);
 518
 519 void __xfrm_state_destroy(struct xfrm_state *x)
 520 {
 521         struct net *net = xs_net(x);
 522
 523         WARN_ON(x->km.state != XFRM_STATE_DEAD);
 524
 525         spin_lock_bh(&xfrm_state_gc_lock);
 526         hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
 527         spin_unlock_bh(&xfrm_state_gc_lock);
 528         schedule_work(&net->xfrm.state_gc_work);
 529 }
 530 EXPORT_SYMBOL(__xfrm_state_destroy);
 531
 532 int __xfrm_state_delete(struct xfrm_state *x)
 533 {
 534         struct net *net = xs_net(x);
 535         int err = -ESRCH;
 536
 537         if (x->km.state != XFRM_STATE_DEAD) {
 538                 x->km.state = XFRM_STATE_DEAD;
 539                 spin_lock(&xfrm_state_lock);
 540                 list_del(&x->km.all);
 541                 hlist_del(&x->bydst);
 542                 hlist_del(&x->bysrc);
 543                 if (x->id.spi)
 544                         hlist_del(&x->byspi);
 545                 net->xfrm.state_num--;
 546                 spin_unlock(&xfrm_state_lock);
 547
 548                 /* All xfrm_state objects are created by xfrm_state_alloc.
 549                  * The xfrm_state_alloc call gives a reference, and that
 550                  * is what we are dropping here.
 551                  */
 552                 xfrm_state_put(x);
 553                 err = 0;
 554         }
 555
 556         return err;
 557 }
 558 EXPORT_SYMBOL(__xfrm_state_delete);
 559
 560 int xfrm_state_delete(struct xfrm_state *x)
 561 {
 562         int err;
 563
 564         spin_lock_bh(&x->lock);
 565         err = __xfrm_state_delete(x);
 566         spin_unlock_bh(&x->lock);
 567
 568         return err;
 569 }
 570 EXPORT_SYMBOL(xfrm_state_delete);
 571
 572 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 573 static inline int
 574 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 575 {
 576         int i, err = 0;
 577
 578         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 579                 struct hlist_node *entry;
 580                 struct xfrm_state *x;
 581
 582                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
 583                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 584                            (err = security_xfrm_state_delete(x)) != 0) {
 585                                 xfrm_audit_state_delete(x, 0,
 586                                                         audit_info->loginuid,
 587                                                         audit_info->sessionid,
 588                                                         audit_info->secid);
 589                                 return err;
 590                         }
 591                 }
 592         }
 593
 594         return err;
 595 }
 596 #else
 597 static inline int
 598 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 599 {
 600         return 0;
 601 }
 602 #endif
 603
 604 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
 605 {
 606         int i, err = 0;
 607
 608         spin_lock_bh(&xfrm_state_lock);
 609         err = xfrm_state_flush_secctx_check(net, proto, audit_info);
 610         if (err)
 611                 goto out;
 612
 613         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 614                 struct hlist_node *entry;
 615                 struct xfrm_state *x;
 616 restart:
 617                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
 618                         if (!xfrm_state_kern(x) &&
 619                             xfrm_id_proto_match(x->id.proto, proto)) {
 620                                 xfrm_state_hold(x);
 621                                 spin_unlock_bh(&xfrm_state_lock);
 622
 623                                 err = xfrm_state_delete(x);
 624                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 625                                                         audit_info->loginuid,
 626                                                         audit_info->sessionid,
 627                                                         audit_info->secid);
 628                                 xfrm_state_put(x);
 629
 630                                 spin_lock_bh(&xfrm_state_lock);
 631                                 goto restart;
 632                         }
 633                 }
 634         }
 635         err = 0;
 636
 637 out:
 638         spin_unlock_bh(&xfrm_state_lock);
 639         wake_up(&net->xfrm.km_waitq);
 640         return err;
 641 }
 642 EXPORT_SYMBOL(xfrm_state_flush);
 643
 644 void xfrm_sad_getinfo(struct xfrmk_sadinfo *si)
 645 {
 646         spin_lock_bh(&xfrm_state_lock);
 647         si->sadcnt = init_net.xfrm.state_num;
 648         si->sadhcnt = init_net.xfrm.state_hmask;
 649         si->sadhmcnt = xfrm_state_hashmax;
 650         spin_unlock_bh(&xfrm_state_lock);
 651 }
 652 EXPORT_SYMBOL(xfrm_sad_getinfo);
 653
 654 static int
 655 xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
 656                   struct xfrm_tmpl *tmpl,
 657                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 658                   unsigned short family)
 659 {
 660         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 661         if (!afinfo)
 662                 return -1;
 663         afinfo->init_tempsel(x, fl, tmpl, daddr, saddr);
 664         xfrm_state_put_afinfo(afinfo);
 665         return 0;
 666 }
 667
 668 static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
 669 {
 670         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 671         struct xfrm_state *x;
 672         struct hlist_node *entry;
 673
 674         hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
 675                 if (x->props.family != family ||
 676                     x->id.spi       != spi ||
 677                     x->id.proto     != proto ||
 678                     xfrm_addr_cmp(&x->id.daddr, daddr, family))
 679                         continue;
 680
 681                 xfrm_state_hold(x);
 682                 return x;
 683         }
 684
 685         return NULL;
 686 }
 687
 688 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family)
 689 {
 690         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 691         struct xfrm_state *x;
 692         struct hlist_node *entry;
 693
 694         hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
 695                 if (x->props.family != family ||
 696                     x->id.proto     != proto ||
 697                     xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
 698                     xfrm_addr_cmp(&x->props.saddr, saddr, family))
 699                         continue;
 700
 701                 xfrm_state_hold(x);
 702                 return x;
 703         }
 704
 705         return NULL;
 706 }
 707
 708 static inline struct xfrm_state *
 709 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 710 {
 711         struct net *net = xs_net(x);
 712
 713         if (use_spi)
 714                 return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi,
 715                                            x->id.proto, family);
 716         else
 717                 return __xfrm_state_lookup_byaddr(net, &x->id.daddr,
 718                                                   &x->props.saddr,
 719                                                   x->id.proto, family);
 720 }
 721
 722 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 723 {
 724         if (have_hash_collision &&
 725             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 726             net->xfrm.state_num > net->xfrm.state_hmask)
 727                 schedule_work(&net->xfrm.state_hash_work);
 728 }
 729
 730 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
 731                                struct flowi *fl, unsigned short family,
 732                                xfrm_address_t *daddr, xfrm_address_t *saddr,
 733                                struct xfrm_state **best, int *acq_in_progress,
 734                                int *error)
 735 {
 736         /* Resolution logic:
 737          * 1. There is a valid state with matching selector. Done.
 738          * 2. Valid state with inappropriate selector. Skip.
 739          *
 740          * Entering area of "sysdeps".
 741          *
 742          * 3. If state is not valid, selector is temporary, it selects
 743          *    only session which triggered previous resolution. Key
 744          *    manager will do something to install a state with proper
 745          *    selector.
 746          */
 747         if (x->km.state == XFRM_STATE_VALID) {
 748                 if ((x->sel.family &&
 749                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
 750                     !security_xfrm_state_pol_flow_match(x, pol, fl))
 751                         return;
 752
 753                 if (!*best ||
 754                     (*best)->km.dying > x->km.dying ||
 755                     ((*best)->km.dying == x->km.dying &&
 756                      (*best)->curlft.add_time < x->curlft.add_time))
 757                         *best = x;
 758         } else if (x->km.state == XFRM_STATE_ACQ) {
 759                 *acq_in_progress = 1;
 760         } else if (x->km.state == XFRM_STATE_ERROR ||
 761                    x->km.state == XFRM_STATE_EXPIRED) {
 762                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
 763                     security_xfrm_state_pol_flow_match(x, pol, fl))
 764                         *error = -ESRCH;
 765         }
 766 }
 767
 768 struct xfrm_state *
 769 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 770                 struct flowi *fl, struct xfrm_tmpl *tmpl,
 771                 struct xfrm_policy *pol, int *err,
 772                 unsigned short family)
 773 {
 774         static xfrm_address_t saddr_wildcard = { };
 775         struct net *net = xp_net(pol);
 776         unsigned int h, h_wildcard;
 777         struct hlist_node *entry;
 778         struct xfrm_state *x, *x0, *to_put;
 779         int acquire_in_progress = 0;
 780         int error = 0;
 781         struct xfrm_state *best = NULL;
 782
 783         to_put = NULL;
 784
 785         spin_lock_bh(&xfrm_state_lock);
 786         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family);
 787         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 788                 if (x->props.family == family &&
 789                     x->props.reqid == tmpl->reqid &&
 790                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 791                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 792                     tmpl->mode == x->props.mode &&
 793                     tmpl->id.proto == x->id.proto &&
 794                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 795                         xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
 796                                            &best, &acquire_in_progress, &error);
 797         }
 798         if (best)
 799                 goto found;
 800
 801         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family);
 802         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
 803                 if (x->props.family == family &&
 804                     x->props.reqid == tmpl->reqid &&
 805                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 806                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 807                     tmpl->mode == x->props.mode &&
 808                     tmpl->id.proto == x->id.proto &&
 809                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 810                         xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
 811                                            &best, &acquire_in_progress, &error);
 812         }
 813
 814 found:
 815         x = best;
 816         if (!x && !error && !acquire_in_progress) {
 817                 if (tmpl->id.spi &&
 818                     (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi,
 819                                               tmpl->id.proto, family)) != NULL) {
 820                         to_put = x0;
 821                         error = -EEXIST;
 822                         goto out;
 823                 }
 824                 x = xfrm_state_alloc(net);
 825                 if (x == NULL) {
 826                         error = -ENOMEM;
 827                         goto out;
 828                 }
 829                 /* Initialize temporary selector matching only
 830                  * to current session. */
 831                 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
 832
 833                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
 834                 if (error) {
 835                         x->km.state = XFRM_STATE_DEAD;
 836                         to_put = x;
 837                         x = NULL;
 838                         goto out;
 839                 }
 840
 841                 if (km_query(x, tmpl, pol) == 0) {
 842                         x->km.state = XFRM_STATE_ACQ;
 843                         list_add(&x->km.all, &net->xfrm.state_all);
 844                         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 845                         h = xfrm_src_hash(net, daddr, saddr, family);
 846                         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 847                         if (x->id.spi) {
 848                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family);
 849                                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 850                         }
 851                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
 852                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
 853                         net->xfrm.state_num++;
 854                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 855                 } else {
 856                         x->km.state = XFRM_STATE_DEAD;
 857                         to_put = x;
 858                         x = NULL;
 859                         error = -ESRCH;
 860                 }
 861         }
 862 out:
 863         if (x)
 864                 xfrm_state_hold(x);
 865         else
 866                 *err = acquire_in_progress ? -EAGAIN : error;
 867         spin_unlock_bh(&xfrm_state_lock);
 868         if (to_put)
 869                 xfrm_state_put(to_put);
 870         return x;
 871 }
 872
 873 struct xfrm_state *
 874 xfrm_stateonly_find(struct net *net,
 875                     xfrm_address_t *daddr, xfrm_address_t *saddr,
 876                     unsigned short family, u8 mode, u8 proto, u32 reqid)
 877 {
 878         unsigned int h;
 879         struct xfrm_state *rx = NULL, *x = NULL;
 880         struct hlist_node *entry;
 881
 882         spin_lock(&xfrm_state_lock);
 883         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 884         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 885                 if (x->props.family == family &&
 886                     x->props.reqid == reqid &&
 887                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 888                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 889                     mode == x->props.mode &&
 890                     proto == x->id.proto &&
 891                     x->km.state == XFRM_STATE_VALID) {
 892                         rx = x;
 893                         break;
 894                 }
 895         }
 896
 897         if (rx)
 898                 xfrm_state_hold(rx);
 899         spin_unlock(&xfrm_state_lock);
 900
 901
 902         return rx;
 903 }
 904 EXPORT_SYMBOL(xfrm_stateonly_find);
 905
 906 static void __xfrm_state_insert(struct xfrm_state *x)
 907 {
 908         struct net *net = xs_net(x);
 909         unsigned int h;
 910
 911         x->genid = ++xfrm_state_genid;
 912
 913         list_add(&x->km.all, &net->xfrm.state_all);
 914
 915         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
 916                           x->props.reqid, x->props.family);
 917         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 918
 919         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
 920         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 921
 922         if (x->id.spi) {
 923                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
 924                                   x->props.family);
 925
 926                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 927         }
 928
 929         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
 930         if (x->replay_maxage)
 931                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
 932
 933         wake_up(&net->xfrm.km_waitq);
 934
 935         net->xfrm.state_num++;
 936
 937         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 938 }
 939
 940 /* xfrm_state_lock is held */
 941 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
 942 {
 943         struct net *net = xs_net(xnew);
 944         unsigned short family = xnew->props.family;
 945         u32 reqid = xnew->props.reqid;
 946         struct xfrm_state *x;
 947         struct hlist_node *entry;
 948         unsigned int h;
 949
 950         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
 951         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 952                 if (x->props.family     == family &&
 953                     x->props.reqid      == reqid &&
 954                     !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
 955                     !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
 956                         x->genid = xfrm_state_genid;
 957         }
 958 }
 959
 960 void xfrm_state_insert(struct xfrm_state *x)
 961 {
 962         spin_lock_bh(&xfrm_state_lock);
 963         __xfrm_state_bump_genids(x);
 964         __xfrm_state_insert(x);
 965         spin_unlock_bh(&xfrm_state_lock);
 966 }
 967 EXPORT_SYMBOL(xfrm_state_insert);
 968
 969 /* xfrm_state_lock is held */
 970 static struct xfrm_state *__find_acq_core(struct net *net, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create)
 971 {
 972         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 973         struct hlist_node *entry;
 974         struct xfrm_state *x;
 975
 976         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 977                 if (x->props.reqid  != reqid ||
 978                     x->props.mode   != mode ||
 979                     x->props.family != family ||
 980                     x->km.state     != XFRM_STATE_ACQ ||
 981                     x->id.spi       != 0 ||
 982                     x->id.proto     != proto ||
 983                     xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
 984                     xfrm_addr_cmp(&x->props.saddr, saddr, family))
 985                         continue;
 986
 987                 xfrm_state_hold(x);
 988                 return x;
 989         }
 990
 991         if (!create)
 992                 return NULL;
 993
 994         x = xfrm_state_alloc(net);
 995         if (likely(x)) {
 996                 switch (family) {
 997                 case AF_INET:
 998                         x->sel.daddr.a4 = daddr->a4;
 999                         x->sel.saddr.a4 = saddr->a4;
1000                         x->sel.prefixlen_d = 32;
1001                         x->sel.prefixlen_s = 32;
1002                         x->props.saddr.a4 = saddr->a4;
1003                         x->id.daddr.a4 = daddr->a4;
1004                         break;
1005
1006                 case AF_INET6:
1007                         ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1008                                        (struct in6_addr *)daddr);
1009                         ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1010                                        (struct in6_addr *)saddr);
1011                         x->sel.prefixlen_d = 128;
1012                         x->sel.prefixlen_s = 128;
1013                         ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1014                                        (struct in6_addr *)saddr);
1015                         ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1016                                        (struct in6_addr *)daddr);
1017                         break;
1018                 }
1019
1020                 x->km.state = XFRM_STATE_ACQ;
1021                 x->id.proto = proto;
1022                 x->props.family = family;
1023                 x->props.mode = mode;
1024                 x->props.reqid = reqid;
1025                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1026                 xfrm_state_hold(x);
1027                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1028                 list_add(&x->km.all, &net->xfrm.state_all);
1029                 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1030                 h = xfrm_src_hash(net, daddr, saddr, family);
1031                 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1032
1033                 net->xfrm.state_num++;
1034
1035                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1036         }
1037
1038         return x;
1039 }
1040
1041 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq);
1042
1043 int xfrm_state_add(struct xfrm_state *x)
1044 {
1045         struct net *net = xs_net(x);
1046         struct xfrm_state *x1, *to_put;
1047         int family;
1048         int err;
1049         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1050
1051         family = x->props.family;
1052
1053         to_put = NULL;
1054
1055         spin_lock_bh(&xfrm_state_lock);
1056
1057         x1 = __xfrm_state_locate(x, use_spi, family);
1058         if (x1) {
1059                 to_put = x1;
1060                 x1 = NULL;
1061                 err = -EEXIST;
1062                 goto out;
1063         }
1064
1065         if (use_spi && x->km.seq) {
1066                 x1 = __xfrm_find_acq_byseq(net, x->km.seq);
1067                 if (x1 && ((x1->id.proto != x->id.proto) ||
1068                     xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1069                         to_put = x1;
1070                         x1 = NULL;
1071                 }
1072         }
1073
1074         if (use_spi && !x1)
1075                 x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid,
1076                                      x->id.proto,
1077                                      &x->id.daddr, &x->props.saddr, 0);
1078
1079         __xfrm_state_bump_genids(x);
1080         __xfrm_state_insert(x);
1081         err = 0;
1082
1083 out:
1084         spin_unlock_bh(&xfrm_state_lock);
1085
1086         if (x1) {
1087                 xfrm_state_delete(x1);
1088                 xfrm_state_put(x1);
1089         }
1090
1091         if (to_put)
1092                 xfrm_state_put(to_put);
1093
1094         return err;
1095 }
1096 EXPORT_SYMBOL(xfrm_state_add);
1097
1098 #ifdef CONFIG_XFRM_MIGRATE
1099 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1100 {
1101         struct net *net = xs_net(orig);
1102         int err = -ENOMEM;
1103         struct xfrm_state *x = xfrm_state_alloc(net);
1104         if (!x)
1105                 goto error;
1106
1107         memcpy(&x->id, &orig->id, sizeof(x->id));
1108         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1109         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1110         x->props.mode = orig->props.mode;
1111         x->props.replay_window = orig->props.replay_window;
1112         x->props.reqid = orig->props.reqid;
1113         x->props.family = orig->props.family;
1114         x->props.saddr = orig->props.saddr;
1115
1116         if (orig->aalg) {
1117                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1118                 if (!x->aalg)
1119                         goto error;
1120         }
1121         x->props.aalgo = orig->props.aalgo;
1122
1123         if (orig->ealg) {
1124                 x->ealg = xfrm_algo_clone(orig->ealg);
1125                 if (!x->ealg)
1126                         goto error;
1127         }
1128         x->props.ealgo = orig->props.ealgo;
1129
1130         if (orig->calg) {
1131                 x->calg = xfrm_algo_clone(orig->calg);
1132                 if (!x->calg)
1133                         goto error;
1134         }
1135         x->props.calgo = orig->props.calgo;
1136
1137         if (orig->encap) {
1138                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1139                 if (!x->encap)
1140                         goto error;
1141         }
1142
1143         if (orig->coaddr) {
1144                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1145                                     GFP_KERNEL);
1146                 if (!x->coaddr)
1147                         goto error;
1148         }
1149
1150         err = xfrm_init_state(x);
1151         if (err)
1152                 goto error;
1153
1154         x->props.flags = orig->props.flags;
1155
1156         x->curlft.add_time = orig->curlft.add_time;
1157         x->km.state = orig->km.state;
1158         x->km.seq = orig->km.seq;
1159
1160         return x;
1161
1162  error:
1163         if (errp)
1164                 *errp = err;
1165         if (x) {
1166                 kfree(x->aalg);
1167                 kfree(x->ealg);
1168                 kfree(x->calg);
1169                 kfree(x->encap);
1170                 kfree(x->coaddr);
1171         }
1172         kfree(x);
1173         return NULL;
1174 }
1175
1176 /* xfrm_state_lock is held */
1177 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1178 {
1179         unsigned int h;
1180         struct xfrm_state *x;
1181         struct hlist_node *entry;
1182
1183         if (m->reqid) {
1184                 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1185                                   m->reqid, m->old_family);
1186                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1187                         if (x->props.mode != m->mode ||
1188                             x->id.proto != m->proto)
1189                                 continue;
1190                         if (m->reqid && x->props.reqid != m->reqid)
1191                                 continue;
1192                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1193                                           m->old_family) ||
1194                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1195                                           m->old_family))
1196                                 continue;
1197                         xfrm_state_hold(x);
1198                         return x;
1199                 }
1200         } else {
1201                 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1202                                   m->old_family);
1203                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1204                         if (x->props.mode != m->mode ||
1205                             x->id.proto != m->proto)
1206                                 continue;
1207                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1208                                           m->old_family) ||
1209                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1210                                           m->old_family))
1211                                 continue;
1212                         xfrm_state_hold(x);
1213                         return x;
1214                 }
1215         }
1216
1217         return NULL;
1218 }
1219 EXPORT_SYMBOL(xfrm_migrate_state_find);
1220
1221 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1222                                        struct xfrm_migrate *m)
1223 {
1224         struct xfrm_state *xc;
1225         int err;
1226
1227         xc = xfrm_state_clone(x, &err);
1228         if (!xc)
1229                 return NULL;
1230
1231         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1232         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1233
1234         /* add state */
1235         if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1236                 /* a care is needed when the destination address of the
1237                    state is to be updated as it is a part of triplet */
1238                 xfrm_state_insert(xc);
1239         } else {
1240                 if ((err = xfrm_state_add(xc)) < 0)
1241                         goto error;
1242         }
1243
1244         return xc;
1245 error:
1246         kfree(xc);
1247         return NULL;
1248 }
1249 EXPORT_SYMBOL(xfrm_state_migrate);
1250 #endif
1251
1252 int xfrm_state_update(struct xfrm_state *x)
1253 {
1254         struct xfrm_state *x1, *to_put;
1255         int err;
1256         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1257
1258         to_put = NULL;
1259
1260         spin_lock_bh(&xfrm_state_lock);
1261         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1262
1263         err = -ESRCH;
1264         if (!x1)
1265                 goto out;
1266
1267         if (xfrm_state_kern(x1)) {
1268                 to_put = x1;
1269                 err = -EEXIST;
1270                 goto out;
1271         }
1272
1273         if (x1->km.state == XFRM_STATE_ACQ) {
1274                 __xfrm_state_insert(x);
1275                 x = NULL;
1276         }
1277         err = 0;
1278
1279 out:
1280         spin_unlock_bh(&xfrm_state_lock);
1281
1282         if (to_put)
1283                 xfrm_state_put(to_put);
1284
1285         if (err)
1286                 return err;
1287
1288         if (!x) {
1289                 xfrm_state_delete(x1);
1290                 xfrm_state_put(x1);
1291                 return 0;
1292         }
1293
1294         err = -EINVAL;
1295         spin_lock_bh(&x1->lock);
1296         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1297                 if (x->encap && x1->encap)
1298                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1299                 if (x->coaddr && x1->coaddr) {
1300                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1301                 }
1302                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1303                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1304                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1305                 x1->km.dying = 0;
1306
1307                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1308                 if (x1->curlft.use_time)
1309                         xfrm_state_check_expire(x1);
1310
1311                 err = 0;
1312         }
1313         spin_unlock_bh(&x1->lock);
1314
1315         xfrm_state_put(x1);
1316
1317         return err;
1318 }
1319 EXPORT_SYMBOL(xfrm_state_update);
1320
1321 int xfrm_state_check_expire(struct xfrm_state *x)
1322 {
1323         if (!x->curlft.use_time)
1324                 x->curlft.use_time = get_seconds();
1325
1326         if (x->km.state != XFRM_STATE_VALID)
1327                 return -EINVAL;
1328
1329         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1330             x->curlft.packets >= x->lft.hard_packet_limit) {
1331                 x->km.state = XFRM_STATE_EXPIRED;
1332                 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1333                 return -EINVAL;
1334         }
1335
1336         if (!x->km.dying &&
1337             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1338              x->curlft.packets >= x->lft.soft_packet_limit)) {
1339                 x->km.dying = 1;
1340                 km_state_expired(x, 0, 0);
1341         }
1342         return 0;
1343 }
1344 EXPORT_SYMBOL(xfrm_state_check_expire);
1345
1346 struct xfrm_state *
1347 xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto,
1348                   unsigned short family)
1349 {
1350         struct xfrm_state *x;
1351
1352         spin_lock_bh(&xfrm_state_lock);
1353         x = __xfrm_state_lookup(net, daddr, spi, proto, family);
1354         spin_unlock_bh(&xfrm_state_lock);
1355         return x;
1356 }
1357 EXPORT_SYMBOL(xfrm_state_lookup);
1358
1359 struct xfrm_state *
1360 xfrm_state_lookup_byaddr(struct net *net,
1361                          xfrm_address_t *daddr, xfrm_address_t *saddr,
1362                          u8 proto, unsigned short family)
1363 {
1364         struct xfrm_state *x;
1365
1366         spin_lock_bh(&xfrm_state_lock);
1367         x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family);
1368         spin_unlock_bh(&xfrm_state_lock);
1369         return x;
1370 }
1371 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1372
1373 struct xfrm_state *
1374 xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1375               xfrm_address_t *daddr, xfrm_address_t *saddr,
1376               int create, unsigned short family)
1377 {
1378         struct xfrm_state *x;
1379
1380         spin_lock_bh(&xfrm_state_lock);
1381         x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create);
1382         spin_unlock_bh(&xfrm_state_lock);
1383
1384         return x;
1385 }
1386 EXPORT_SYMBOL(xfrm_find_acq);
1387
1388 #ifdef CONFIG_XFRM_SUB_POLICY
1389 int
1390 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1391                unsigned short family)
1392 {
1393         int err = 0;
1394         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1395         if (!afinfo)
1396                 return -EAFNOSUPPORT;
1397
1398         spin_lock_bh(&xfrm_state_lock);
1399         if (afinfo->tmpl_sort)
1400                 err = afinfo->tmpl_sort(dst, src, n);
1401         spin_unlock_bh(&xfrm_state_lock);
1402         xfrm_state_put_afinfo(afinfo);
1403         return err;
1404 }
1405 EXPORT_SYMBOL(xfrm_tmpl_sort);
1406
1407 int
1408 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1409                 unsigned short family)
1410 {
1411         int err = 0;
1412         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1413         if (!afinfo)
1414                 return -EAFNOSUPPORT;
1415
1416         spin_lock_bh(&xfrm_state_lock);
1417         if (afinfo->state_sort)
1418                 err = afinfo->state_sort(dst, src, n);
1419         spin_unlock_bh(&xfrm_state_lock);
1420         xfrm_state_put_afinfo(afinfo);
1421         return err;
1422 }
1423 EXPORT_SYMBOL(xfrm_state_sort);
1424 #endif
1425
1426 /* Silly enough, but I'm lazy to build resolution list */
1427
1428 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq)
1429 {
1430         int i;
1431
1432         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1433                 struct hlist_node *entry;
1434                 struct xfrm_state *x;
1435
1436                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1437                         if (x->km.seq == seq &&
1438                             x->km.state == XFRM_STATE_ACQ) {
1439                                 xfrm_state_hold(x);
1440                                 return x;
1441                         }
1442                 }
1443         }
1444         return NULL;
1445 }
1446
1447 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq)
1448 {
1449         struct xfrm_state *x;
1450
1451         spin_lock_bh(&xfrm_state_lock);
1452         x = __xfrm_find_acq_byseq(net, seq);
1453         spin_unlock_bh(&xfrm_state_lock);
1454         return x;
1455 }
1456 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1457
1458 u32 xfrm_get_acqseq(void)
1459 {
1460         u32 res;
1461         static u32 acqseq;
1462         static DEFINE_SPINLOCK(acqseq_lock);
1463
1464         spin_lock_bh(&acqseq_lock);
1465         res = (++acqseq ? : ++acqseq);
1466         spin_unlock_bh(&acqseq_lock);
1467         return res;
1468 }
1469 EXPORT_SYMBOL(xfrm_get_acqseq);
1470
1471 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1472 {
1473         struct net *net = xs_net(x);
1474         unsigned int h;
1475         struct xfrm_state *x0;
1476         int err = -ENOENT;
1477         __be32 minspi = htonl(low);
1478         __be32 maxspi = htonl(high);
1479
1480         spin_lock_bh(&x->lock);
1481         if (x->km.state == XFRM_STATE_DEAD)
1482                 goto unlock;
1483
1484         err = 0;
1485         if (x->id.spi)
1486                 goto unlock;
1487
1488         err = -ENOENT;
1489
1490         if (minspi == maxspi) {
1491                 x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family);
1492                 if (x0) {
1493                         xfrm_state_put(x0);
1494                         goto unlock;
1495                 }
1496                 x->id.spi = minspi;
1497         } else {
1498                 u32 spi = 0;
1499                 for (h=0; h<high-low+1; h++) {
1500                         spi = low + net_random()%(high-low+1);
1501                         x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1502                         if (x0 == NULL) {
1503                                 x->id.spi = htonl(spi);
1504                                 break;
1505                         }
1506                         xfrm_state_put(x0);
1507                 }
1508         }
1509         if (x->id.spi) {
1510                 spin_lock_bh(&xfrm_state_lock);
1511                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1512                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1513                 spin_unlock_bh(&xfrm_state_lock);
1514
1515                 err = 0;
1516         }
1517
1518 unlock:
1519         spin_unlock_bh(&x->lock);
1520
1521         return err;
1522 }
1523 EXPORT_SYMBOL(xfrm_alloc_spi);
1524
1525 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1526                     int (*func)(struct xfrm_state *, int, void*),
1527                     void *data)
1528 {
1529         struct xfrm_state *state;
1530         struct xfrm_state_walk *x;
1531         int err = 0;
1532
1533         if (walk->seq != 0 && list_empty(&walk->all))
1534                 return 0;
1535
1536         spin_lock_bh(&xfrm_state_lock);
1537         if (list_empty(&walk->all))
1538                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1539         else
1540                 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1541         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1542                 if (x->state == XFRM_STATE_DEAD)
1543                         continue;
1544                 state = container_of(x, struct xfrm_state, km);
1545                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1546                         continue;
1547                 err = func(state, walk->seq, data);
1548                 if (err) {
1549                         list_move_tail(&walk->all, &x->all);
1550                         goto out;
1551                 }
1552                 walk->seq++;
1553         }
1554         if (walk->seq == 0) {
1555                 err = -ENOENT;
1556                 goto out;
1557         }
1558         list_del_init(&walk->all);
1559 out:
1560         spin_unlock_bh(&xfrm_state_lock);
1561         return err;
1562 }
1563 EXPORT_SYMBOL(xfrm_state_walk);
1564
1565 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1566 {
1567         INIT_LIST_HEAD(&walk->all);
1568         walk->proto = proto;
1569         walk->state = XFRM_STATE_DEAD;
1570         walk->seq = 0;
1571 }
1572 EXPORT_SYMBOL(xfrm_state_walk_init);
1573
1574 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1575 {
1576         if (list_empty(&walk->all))
1577                 return;
1578
1579         spin_lock_bh(&xfrm_state_lock);
1580         list_del(&walk->all);
1581         spin_unlock_bh(&xfrm_state_lock);
1582 }
1583 EXPORT_SYMBOL(xfrm_state_walk_done);
1584
1585
1586 void xfrm_replay_notify(struct xfrm_state *x, int event)
1587 {
1588         struct km_event c;
1589         /* we send notify messages in case
1590          *  1. we updated on of the sequence numbers, and the seqno difference
1591          *     is at least x->replay_maxdiff, in this case we also update the
1592          *     timeout of our timer function
1593          *  2. if x->replay_maxage has elapsed since last update,
1594          *     and there were changes
1595          *
1596          *  The state structure must be locked!
1597          */
1598
1599         switch (event) {
1600         case XFRM_REPLAY_UPDATE:
1601                 if (x->replay_maxdiff &&
1602                     (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1603                     (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1604                         if (x->xflags & XFRM_TIME_DEFER)
1605                                 event = XFRM_REPLAY_TIMEOUT;
1606                         else
1607                                 return;
1608                 }
1609
1610                 break;
1611
1612         case XFRM_REPLAY_TIMEOUT:
1613                 if ((x->replay.seq == x->preplay.seq) &&
1614                     (x->replay.bitmap == x->preplay.bitmap) &&
1615                     (x->replay.oseq == x->preplay.oseq)) {
1616                         x->xflags |= XFRM_TIME_DEFER;
1617                         return;
1618                 }
1619
1620                 break;
1621         }
1622
1623         memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1624         c.event = XFRM_MSG_NEWAE;
1625         c.data.aevent = event;
1626         km_state_notify(x, &c);
1627
1628         if (x->replay_maxage &&
1629             !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1630                 x->xflags &= ~XFRM_TIME_DEFER;
1631 }
1632
1633 static void xfrm_replay_timer_handler(unsigned long data)
1634 {
1635         struct xfrm_state *x = (struct xfrm_state*)data;
1636
1637         spin_lock(&x->lock);
1638
1639         if (x->km.state == XFRM_STATE_VALID) {
1640                 if (xfrm_aevent_is_on(xs_net(x)))
1641                         xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1642                 else
1643                         x->xflags |= XFRM_TIME_DEFER;
1644         }
1645
1646         spin_unlock(&x->lock);
1647 }
1648
1649 int xfrm_replay_check(struct xfrm_state *x,
1650                       struct sk_buff *skb, __be32 net_seq)
1651 {
1652         u32 diff;
1653         u32 seq = ntohl(net_seq);
1654
1655         if (unlikely(seq == 0))
1656                 goto err;
1657
1658         if (likely(seq > x->replay.seq))
1659                 return 0;
1660
1661         diff = x->replay.seq - seq;
1662         if (diff >= min_t(unsigned int, x->props.replay_window,
1663                           sizeof(x->replay.bitmap) * 8)) {
1664                 x->stats.replay_window++;
1665                 goto err;
1666         }
1667
1668         if (x->replay.bitmap & (1U << diff)) {
1669                 x->stats.replay++;
1670                 goto err;
1671         }
1672         return 0;
1673
1674 err:
1675         xfrm_audit_state_replay(x, skb, net_seq);
1676         return -EINVAL;
1677 }
1678
1679 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1680 {
1681         u32 diff;
1682         u32 seq = ntohl(net_seq);
1683
1684         if (seq > x->replay.seq) {
1685                 diff = seq - x->replay.seq;
1686                 if (diff < x->props.replay_window)
1687                         x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1688                 else
1689                         x->replay.bitmap = 1;
1690                 x->replay.seq = seq;
1691         } else {
1692                 diff = x->replay.seq - seq;
1693                 x->replay.bitmap |= (1U << diff);
1694         }
1695
1696         if (xfrm_aevent_is_on(xs_net(x)))
1697                 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1698 }
1699
1700 static LIST_HEAD(xfrm_km_list);
1701 static DEFINE_RWLOCK(xfrm_km_lock);
1702
1703 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1704 {
1705         struct xfrm_mgr *km;
1706
1707         read_lock(&xfrm_km_lock);
1708         list_for_each_entry(km, &xfrm_km_list, list)
1709                 if (km->notify_policy)
1710                         km->notify_policy(xp, dir, c);
1711         read_unlock(&xfrm_km_lock);
1712 }
1713
1714 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1715 {
1716         struct xfrm_mgr *km;
1717         read_lock(&xfrm_km_lock);
1718         list_for_each_entry(km, &xfrm_km_list, list)
1719                 if (km->notify)
1720                         km->notify(x, c);
1721         read_unlock(&xfrm_km_lock);
1722 }
1723
1724 EXPORT_SYMBOL(km_policy_notify);
1725 EXPORT_SYMBOL(km_state_notify);
1726
1727 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1728 {
1729         struct net *net = xs_net(x);
1730         struct km_event c;
1731
1732         c.data.hard = hard;
1733         c.pid = pid;
1734         c.event = XFRM_MSG_EXPIRE;
1735         km_state_notify(x, &c);
1736
1737         if (hard)
1738                 wake_up(&net->xfrm.km_waitq);
1739 }
1740
1741 EXPORT_SYMBOL(km_state_expired);
1742 /*
1743  * We send to all registered managers regardless of failure
1744  * We are happy with one success
1745 */
1746 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1747 {
1748         int err = -EINVAL, acqret;
1749         struct xfrm_mgr *km;
1750
1751         read_lock(&xfrm_km_lock);
1752         list_for_each_entry(km, &xfrm_km_list, list) {
1753                 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1754                 if (!acqret)
1755                         err = acqret;
1756         }
1757         read_unlock(&xfrm_km_lock);
1758         return err;
1759 }
1760 EXPORT_SYMBOL(km_query);
1761
1762 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1763 {
1764         int err = -EINVAL;
1765         struct xfrm_mgr *km;
1766
1767         read_lock(&xfrm_km_lock);
1768         list_for_each_entry(km, &xfrm_km_list, list) {
1769                 if (km->new_mapping)
1770                         err = km->new_mapping(x, ipaddr, sport);
1771                 if (!err)
1772                         break;
1773         }
1774         read_unlock(&xfrm_km_lock);
1775         return err;
1776 }
1777 EXPORT_SYMBOL(km_new_mapping);
1778
1779 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1780 {
1781         struct net *net = xp_net(pol);
1782         struct km_event c;
1783
1784         c.data.hard = hard;
1785         c.pid = pid;
1786         c.event = XFRM_MSG_POLEXPIRE;
1787         km_policy_notify(pol, dir, &c);
1788
1789         if (hard)
1790                 wake_up(&net->xfrm.km_waitq);
1791 }
1792 EXPORT_SYMBOL(km_policy_expired);
1793
1794 #ifdef CONFIG_XFRM_MIGRATE
1795 int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1796                struct xfrm_migrate *m, int num_migrate,
1797                struct xfrm_kmaddress *k)
1798 {
1799         int err = -EINVAL;
1800         int ret;
1801         struct xfrm_mgr *km;
1802
1803         read_lock(&xfrm_km_lock);
1804         list_for_each_entry(km, &xfrm_km_list, list) {
1805                 if (km->migrate) {
1806                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1807                         if (!ret)
1808                                 err = ret;
1809                 }
1810         }
1811         read_unlock(&xfrm_km_lock);
1812         return err;
1813 }
1814 EXPORT_SYMBOL(km_migrate);
1815 #endif
1816
1817 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1818 {
1819         int err = -EINVAL;
1820         int ret;
1821         struct xfrm_mgr *km;
1822
1823         read_lock(&xfrm_km_lock);
1824         list_for_each_entry(km, &xfrm_km_list, list) {
1825                 if (km->report) {
1826                         ret = km->report(net, proto, sel, addr);
1827                         if (!ret)
1828                                 err = ret;
1829                 }
1830         }
1831         read_unlock(&xfrm_km_lock);
1832         return err;
1833 }
1834 EXPORT_SYMBOL(km_report);
1835
1836 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1837 {
1838         int err;
1839         u8 *data;
1840         struct xfrm_mgr *km;
1841         struct xfrm_policy *pol = NULL;
1842
1843         if (optlen <= 0 || optlen > PAGE_SIZE)
1844                 return -EMSGSIZE;
1845
1846         data = kmalloc(optlen, GFP_KERNEL);
1847         if (!data)
1848                 return -ENOMEM;
1849
1850         err = -EFAULT;
1851         if (copy_from_user(data, optval, optlen))
1852                 goto out;
1853
1854         err = -EINVAL;
1855         read_lock(&xfrm_km_lock);
1856         list_for_each_entry(km, &xfrm_km_list, list) {
1857                 pol = km->compile_policy(sk, optname, data,
1858                                          optlen, &err);
1859                 if (err >= 0)
1860                         break;
1861         }
1862         read_unlock(&xfrm_km_lock);
1863
1864         if (err >= 0) {
1865                 xfrm_sk_policy_insert(sk, err, pol);
1866                 xfrm_pol_put(pol);
1867                 err = 0;
1868         }
1869
1870 out:
1871         kfree(data);
1872         return err;
1873 }
1874 EXPORT_SYMBOL(xfrm_user_policy);
1875
1876 int xfrm_register_km(struct xfrm_mgr *km)
1877 {
1878         write_lock_bh(&xfrm_km_lock);
1879         list_add_tail(&km->list, &xfrm_km_list);
1880         write_unlock_bh(&xfrm_km_lock);
1881         return 0;
1882 }
1883 EXPORT_SYMBOL(xfrm_register_km);
1884
1885 int xfrm_unregister_km(struct xfrm_mgr *km)
1886 {
1887         write_lock_bh(&xfrm_km_lock);
1888         list_del(&km->list);
1889         write_unlock_bh(&xfrm_km_lock);
1890         return 0;
1891 }
1892 EXPORT_SYMBOL(xfrm_unregister_km);
1893
1894 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1895 {
1896         int err = 0;
1897         if (unlikely(afinfo == NULL))
1898                 return -EINVAL;
1899         if (unlikely(afinfo->family >= NPROTO))
1900                 return -EAFNOSUPPORT;
1901         write_lock_bh(&xfrm_state_afinfo_lock);
1902         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1903                 err = -ENOBUFS;
1904         else
1905                 xfrm_state_afinfo[afinfo->family] = afinfo;
1906         write_unlock_bh(&xfrm_state_afinfo_lock);
1907         return err;
1908 }
1909 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1910
1911 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1912 {
1913         int err = 0;
1914         if (unlikely(afinfo == NULL))
1915                 return -EINVAL;
1916         if (unlikely(afinfo->family >= NPROTO))
1917                 return -EAFNOSUPPORT;
1918         write_lock_bh(&xfrm_state_afinfo_lock);
1919         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1920                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1921                         err = -EINVAL;
1922                 else
1923                         xfrm_state_afinfo[afinfo->family] = NULL;
1924         }
1925         write_unlock_bh(&xfrm_state_afinfo_lock);
1926         return err;
1927 }
1928 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1929
1930 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1931 {
1932         struct xfrm_state_afinfo *afinfo;
1933         if (unlikely(family >= NPROTO))
1934                 return NULL;
1935         read_lock(&xfrm_state_afinfo_lock);
1936         afinfo = xfrm_state_afinfo[family];
1937         if (unlikely(!afinfo))
1938                 read_unlock(&xfrm_state_afinfo_lock);
1939         return afinfo;
1940 }
1941
1942 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1943         __releases(xfrm_state_afinfo_lock)
1944 {
1945         read_unlock(&xfrm_state_afinfo_lock);
1946 }
1947
1948 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1949 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1950 {
1951         if (x->tunnel) {
1952                 struct xfrm_state *t = x->tunnel;
1953
1954                 if (atomic_read(&t->tunnel_users) == 2)
1955                         xfrm_state_delete(t);
1956                 atomic_dec(&t->tunnel_users);
1957                 xfrm_state_put(t);
1958                 x->tunnel = NULL;
1959         }
1960 }
1961 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1962
1963 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1964 {
1965         int res;
1966
1967         spin_lock_bh(&x->lock);
1968         if (x->km.state == XFRM_STATE_VALID &&
1969             x->type && x->type->get_mtu)
1970                 res = x->type->get_mtu(x, mtu);
1971         else
1972                 res = mtu - x->props.header_len;
1973         spin_unlock_bh(&x->lock);
1974         return res;
1975 }
1976
1977 int xfrm_init_state(struct xfrm_state *x)
1978 {
1979         struct xfrm_state_afinfo *afinfo;
1980         struct xfrm_mode *inner_mode;
1981         int family = x->props.family;
1982         int err;
1983
1984         err = -EAFNOSUPPORT;
1985         afinfo = xfrm_state_get_afinfo(family);
1986         if (!afinfo)
1987                 goto error;
1988
1989         err = 0;
1990         if (afinfo->init_flags)
1991                 err = afinfo->init_flags(x);
1992
1993         xfrm_state_put_afinfo(afinfo);
1994
1995         if (err)
1996                 goto error;
1997
1998         err = -EPROTONOSUPPORT;
1999
2000         if (x->sel.family != AF_UNSPEC) {
2001                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2002                 if (inner_mode == NULL)
2003                         goto error;
2004
2005                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2006                     family != x->sel.family) {
2007                         xfrm_put_mode(inner_mode);
2008                         goto error;
2009                 }
2010
2011                 x->inner_mode = inner_mode;
2012         } else {
2013                 struct xfrm_mode *inner_mode_iaf;
2014                 int iafamily = AF_INET;
2015
2016                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2017                 if (inner_mode == NULL)
2018                         goto error;
2019
2020                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2021                         xfrm_put_mode(inner_mode);
2022                         goto error;
2023                 }
2024                 x->inner_mode = inner_mode;
2025
2026                 if (x->props.family == AF_INET)
2027                         iafamily = AF_INET6;
2028
2029                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2030                 if (inner_mode_iaf) {
2031                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2032                                 x->inner_mode_iaf = inner_mode_iaf;
2033                         else
2034                                 xfrm_put_mode(inner_mode_iaf);
2035                 }
2036         }
2037
2038         x->type = xfrm_get_type(x->id.proto, family);
2039         if (x->type == NULL)
2040                 goto error;
2041
2042         err = x->type->init_state(x);
2043         if (err)
2044                 goto error;
2045
2046         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2047         if (x->outer_mode == NULL)
2048                 goto error;
2049
2050         x->km.state = XFRM_STATE_VALID;
2051
2052 error:
2053         return err;
2054 }
2055
2056 EXPORT_SYMBOL(xfrm_init_state);
2057
2058 int __net_init xfrm_state_init(struct net *net)
2059 {
2060         unsigned int sz;
2061
2062         INIT_LIST_HEAD(&net->xfrm.state_all);
2063
2064         sz = sizeof(struct hlist_head) * 8;
2065
2066         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2067         if (!net->xfrm.state_bydst)
2068                 goto out_bydst;
2069         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2070         if (!net->xfrm.state_bysrc)
2071                 goto out_bysrc;
2072         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2073         if (!net->xfrm.state_byspi)
2074                 goto out_byspi;
2075         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2076
2077         net->xfrm.state_num = 0;
2078         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2079         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2080         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2081         init_waitqueue_head(&net->xfrm.km_waitq);
2082         return 0;
2083
2084 out_byspi:
2085         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2086 out_bysrc:
2087         xfrm_hash_free(net->xfrm.state_bydst, sz);
2088 out_bydst:
2089         return -ENOMEM;
2090 }
2091
2092 void xfrm_state_fini(struct net *net)
2093 {
2094         struct xfrm_audit audit_info;
2095         unsigned int sz;
2096
2097         flush_work(&net->xfrm.state_hash_work);
2098         audit_info.loginuid = -1;
2099         audit_info.sessionid = -1;
2100         audit_info.secid = 0;
2101         xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2102         flush_work(&net->xfrm.state_gc_work);
2103
2104         WARN_ON(!list_empty(&net->xfrm.state_all));
2105
2106         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2107         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2108         xfrm_hash_free(net->xfrm.state_byspi, sz);
2109         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2110         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2111         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2112         xfrm_hash_free(net->xfrm.state_bydst, sz);
2113 }
2114
2115 #ifdef CONFIG_AUDITSYSCALL
2116 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2117                                      struct audit_buffer *audit_buf)
2118 {
2119         struct xfrm_sec_ctx *ctx = x->security;
2120         u32 spi = ntohl(x->id.spi);
2121
2122         if (ctx)
2123                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2124                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2125
2126         switch(x->props.family) {
2127         case AF_INET:
2128                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2129                                  &x->props.saddr.a4, &x->id.daddr.a4);
2130                 break;
2131         case AF_INET6:
2132                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2133                                  x->props.saddr.a6, x->id.daddr.a6);
2134                 break;
2135         }
2136
2137         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2138 }
2139
2140 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2141                                       struct audit_buffer *audit_buf)
2142 {
2143         struct iphdr *iph4;
2144         struct ipv6hdr *iph6;
2145
2146         switch (family) {
2147         case AF_INET:
2148                 iph4 = ip_hdr(skb);
2149                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2150                                  &iph4->saddr, &iph4->daddr);
2151                 break;
2152         case AF_INET6:
2153                 iph6 = ipv6_hdr(skb);
2154                 audit_log_format(audit_buf,
2155                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2156                                  &iph6->saddr,&iph6->daddr,
2157                                  iph6->flow_lbl[0] & 0x0f,
2158                                  iph6->flow_lbl[1],
2159                                  iph6->flow_lbl[2]);
2160                 break;
2161         }
2162 }
2163
2164 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2165                           uid_t auid, u32 sessionid, u32 secid)
2166 {
2167         struct audit_buffer *audit_buf;
2168
2169         audit_buf = xfrm_audit_start("SAD-add");
2170         if (audit_buf == NULL)
2171                 return;
2172         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2173         xfrm_audit_helper_sainfo(x, audit_buf);
2174         audit_log_format(audit_buf, " res=%u", result);
2175         audit_log_end(audit_buf);
2176 }
2177 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2178
2179 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2180                              uid_t auid, u32 sessionid, u32 secid)
2181 {
2182         struct audit_buffer *audit_buf;
2183
2184         audit_buf = xfrm_audit_start("SAD-delete");
2185         if (audit_buf == NULL)
2186                 return;
2187         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2188         xfrm_audit_helper_sainfo(x, audit_buf);
2189         audit_log_format(audit_buf, " res=%u", result);
2190         audit_log_end(audit_buf);
2191 }
2192 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2193
2194 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2195                                       struct sk_buff *skb)
2196 {
2197         struct audit_buffer *audit_buf;
2198         u32 spi;
2199
2200         audit_buf = xfrm_audit_start("SA-replay-overflow");
2201         if (audit_buf == NULL)
2202                 return;
2203         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2204         /* don't record the sequence number because it's inherent in this kind
2205          * of audit message */
2206         spi = ntohl(x->id.spi);
2207         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2208         audit_log_end(audit_buf);
2209 }
2210 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2211
2212 static void xfrm_audit_state_replay(struct xfrm_state *x,
2213                              struct sk_buff *skb, __be32 net_seq)
2214 {
2215         struct audit_buffer *audit_buf;
2216         u32 spi;
2217
2218         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2219         if (audit_buf == NULL)
2220                 return;
2221         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2222         spi = ntohl(x->id.spi);
2223         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2224                          spi, spi, ntohl(net_seq));
2225         audit_log_end(audit_buf);
2226 }
2227
2228 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2229 {
2230         struct audit_buffer *audit_buf;
2231
2232         audit_buf = xfrm_audit_start("SA-notfound");
2233         if (audit_buf == NULL)
2234                 return;
2235         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2236         audit_log_end(audit_buf);
2237 }
2238 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2239
2240 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2241                                __be32 net_spi, __be32 net_seq)
2242 {
2243         struct audit_buffer *audit_buf;
2244         u32 spi;
2245
2246         audit_buf = xfrm_audit_start("SA-notfound");
2247         if (audit_buf == NULL)
2248                 return;
2249         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2250         spi = ntohl(net_spi);
2251         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2252                          spi, spi, ntohl(net_seq));
2253         audit_log_end(audit_buf);
2254 }
2255 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2256
2257 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2258                               struct sk_buff *skb, u8 proto)
2259 {
2260         struct audit_buffer *audit_buf;
2261         __be32 net_spi;
2262         __be32 net_seq;
2263
2264         audit_buf = xfrm_audit_start("SA-icv-failure");
2265         if (audit_buf == NULL)
2266                 return;
2267         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2268         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2269                 u32 spi = ntohl(net_spi);
2270                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2271                                  spi, spi, ntohl(net_seq));
2272         }
2273         audit_log_end(audit_buf);
2274 }
2275 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2276 #endif /* CONFIG_AUDITSYSCALL */