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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, cnt = 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         err = -ESRCH;
 614         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 615                 struct hlist_node *entry;
 616                 struct xfrm_state *x;
 617 restart:
 618                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
 619                         if (!xfrm_state_kern(x) &&
 620                             xfrm_id_proto_match(x->id.proto, proto)) {
 621                                 xfrm_state_hold(x);
 622                                 spin_unlock_bh(&xfrm_state_lock);
 623
 624                                 err = xfrm_state_delete(x);
 625                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 626                                                         audit_info->loginuid,
 627                                                         audit_info->sessionid,
 628                                                         audit_info->secid);
 629                                 xfrm_state_put(x);
 630                                 if (!err)
 631                                         cnt++;
 632
 633                                 spin_lock_bh(&xfrm_state_lock);
 634                                 goto restart;
 635                         }
 636                 }
 637         }
 638         if (cnt)
 639                 err = 0;
 640
 641 out:
 642         spin_unlock_bh(&xfrm_state_lock);
 643         wake_up(&net->xfrm.km_waitq);
 644         return err;
 645 }
 646 EXPORT_SYMBOL(xfrm_state_flush);
 647
 648 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 649 {
 650         spin_lock_bh(&xfrm_state_lock);
 651         si->sadcnt = net->xfrm.state_num;
 652         si->sadhcnt = net->xfrm.state_hmask;
 653         si->sadhmcnt = xfrm_state_hashmax;
 654         spin_unlock_bh(&xfrm_state_lock);
 655 }
 656 EXPORT_SYMBOL(xfrm_sad_getinfo);
 657
 658 static int
 659 xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
 660                   struct xfrm_tmpl *tmpl,
 661                   xfrm_address_t *daddr, xfrm_address_t *saddr,
 662                   unsigned short family)
 663 {
 664         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 665         if (!afinfo)
 666                 return -1;
 667         afinfo->init_tempsel(x, fl, tmpl, daddr, saddr);
 668         xfrm_state_put_afinfo(afinfo);
 669         return 0;
 670 }
 671
 672 static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
 673 {
 674         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 675         struct xfrm_state *x;
 676         struct hlist_node *entry;
 677
 678         hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
 679                 if (x->props.family != family ||
 680                     x->id.spi       != spi ||
 681                     x->id.proto     != proto ||
 682                     xfrm_addr_cmp(&x->id.daddr, daddr, family))
 683                         continue;
 684
 685                 xfrm_state_hold(x);
 686                 return x;
 687         }
 688
 689         return NULL;
 690 }
 691
 692 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family)
 693 {
 694         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 695         struct xfrm_state *x;
 696         struct hlist_node *entry;
 697
 698         hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
 699                 if (x->props.family != family ||
 700                     x->id.proto     != proto ||
 701                     xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
 702                     xfrm_addr_cmp(&x->props.saddr, saddr, family))
 703                         continue;
 704
 705                 xfrm_state_hold(x);
 706                 return x;
 707         }
 708
 709         return NULL;
 710 }
 711
 712 static inline struct xfrm_state *
 713 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 714 {
 715         struct net *net = xs_net(x);
 716
 717         if (use_spi)
 718                 return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi,
 719                                            x->id.proto, family);
 720         else
 721                 return __xfrm_state_lookup_byaddr(net, &x->id.daddr,
 722                                                   &x->props.saddr,
 723                                                   x->id.proto, family);
 724 }
 725
 726 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 727 {
 728         if (have_hash_collision &&
 729             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 730             net->xfrm.state_num > net->xfrm.state_hmask)
 731                 schedule_work(&net->xfrm.state_hash_work);
 732 }
 733
 734 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
 735                                struct flowi *fl, unsigned short family,
 736                                xfrm_address_t *daddr, xfrm_address_t *saddr,
 737                                struct xfrm_state **best, int *acq_in_progress,
 738                                int *error)
 739 {
 740         /* Resolution logic:
 741          * 1. There is a valid state with matching selector. Done.
 742          * 2. Valid state with inappropriate selector. Skip.
 743          *
 744          * Entering area of "sysdeps".
 745          *
 746          * 3. If state is not valid, selector is temporary, it selects
 747          *    only session which triggered previous resolution. Key
 748          *    manager will do something to install a state with proper
 749          *    selector.
 750          */
 751         if (x->km.state == XFRM_STATE_VALID) {
 752                 if ((x->sel.family &&
 753                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
 754                     !security_xfrm_state_pol_flow_match(x, pol, fl))
 755                         return;
 756
 757                 if (!*best ||
 758                     (*best)->km.dying > x->km.dying ||
 759                     ((*best)->km.dying == x->km.dying &&
 760                      (*best)->curlft.add_time < x->curlft.add_time))
 761                         *best = x;
 762         } else if (x->km.state == XFRM_STATE_ACQ) {
 763                 *acq_in_progress = 1;
 764         } else if (x->km.state == XFRM_STATE_ERROR ||
 765                    x->km.state == XFRM_STATE_EXPIRED) {
 766                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
 767                     security_xfrm_state_pol_flow_match(x, pol, fl))
 768                         *error = -ESRCH;
 769         }
 770 }
 771
 772 struct xfrm_state *
 773 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
 774                 struct flowi *fl, struct xfrm_tmpl *tmpl,
 775                 struct xfrm_policy *pol, int *err,
 776                 unsigned short family)
 777 {
 778         static xfrm_address_t saddr_wildcard = { };
 779         struct net *net = xp_net(pol);
 780         unsigned int h, h_wildcard;
 781         struct hlist_node *entry;
 782         struct xfrm_state *x, *x0, *to_put;
 783         int acquire_in_progress = 0;
 784         int error = 0;
 785         struct xfrm_state *best = NULL;
 786
 787         to_put = NULL;
 788
 789         spin_lock_bh(&xfrm_state_lock);
 790         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family);
 791         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 792                 if (x->props.family == family &&
 793                     x->props.reqid == tmpl->reqid &&
 794                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 795                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 796                     tmpl->mode == x->props.mode &&
 797                     tmpl->id.proto == x->id.proto &&
 798                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 799                         xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
 800                                            &best, &acquire_in_progress, &error);
 801         }
 802         if (best)
 803                 goto found;
 804
 805         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family);
 806         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
 807                 if (x->props.family == family &&
 808                     x->props.reqid == tmpl->reqid &&
 809                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 810                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 811                     tmpl->mode == x->props.mode &&
 812                     tmpl->id.proto == x->id.proto &&
 813                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 814                         xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
 815                                            &best, &acquire_in_progress, &error);
 816         }
 817
 818 found:
 819         x = best;
 820         if (!x && !error && !acquire_in_progress) {
 821                 if (tmpl->id.spi &&
 822                     (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi,
 823                                               tmpl->id.proto, family)) != NULL) {
 824                         to_put = x0;
 825                         error = -EEXIST;
 826                         goto out;
 827                 }
 828                 x = xfrm_state_alloc(net);
 829                 if (x == NULL) {
 830                         error = -ENOMEM;
 831                         goto out;
 832                 }
 833                 /* Initialize temporary selector matching only
 834                  * to current session. */
 835                 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
 836
 837                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
 838                 if (error) {
 839                         x->km.state = XFRM_STATE_DEAD;
 840                         to_put = x;
 841                         x = NULL;
 842                         goto out;
 843                 }
 844
 845                 if (km_query(x, tmpl, pol) == 0) {
 846                         x->km.state = XFRM_STATE_ACQ;
 847                         list_add(&x->km.all, &net->xfrm.state_all);
 848                         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 849                         h = xfrm_src_hash(net, daddr, saddr, family);
 850                         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 851                         if (x->id.spi) {
 852                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family);
 853                                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 854                         }
 855                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
 856                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
 857                         net->xfrm.state_num++;
 858                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 859                 } else {
 860                         x->km.state = XFRM_STATE_DEAD;
 861                         to_put = x;
 862                         x = NULL;
 863                         error = -ESRCH;
 864                 }
 865         }
 866 out:
 867         if (x)
 868                 xfrm_state_hold(x);
 869         else
 870                 *err = acquire_in_progress ? -EAGAIN : error;
 871         spin_unlock_bh(&xfrm_state_lock);
 872         if (to_put)
 873                 xfrm_state_put(to_put);
 874         return x;
 875 }
 876
 877 struct xfrm_state *
 878 xfrm_stateonly_find(struct net *net,
 879                     xfrm_address_t *daddr, xfrm_address_t *saddr,
 880                     unsigned short family, u8 mode, u8 proto, u32 reqid)
 881 {
 882         unsigned int h;
 883         struct xfrm_state *rx = NULL, *x = NULL;
 884         struct hlist_node *entry;
 885
 886         spin_lock(&xfrm_state_lock);
 887         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 888         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 889                 if (x->props.family == family &&
 890                     x->props.reqid == reqid &&
 891                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 892                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 893                     mode == x->props.mode &&
 894                     proto == x->id.proto &&
 895                     x->km.state == XFRM_STATE_VALID) {
 896                         rx = x;
 897                         break;
 898                 }
 899         }
 900
 901         if (rx)
 902                 xfrm_state_hold(rx);
 903         spin_unlock(&xfrm_state_lock);
 904
 905
 906         return rx;
 907 }
 908 EXPORT_SYMBOL(xfrm_stateonly_find);
 909
 910 static void __xfrm_state_insert(struct xfrm_state *x)
 911 {
 912         struct net *net = xs_net(x);
 913         unsigned int h;
 914
 915         x->genid = ++xfrm_state_genid;
 916
 917         list_add(&x->km.all, &net->xfrm.state_all);
 918
 919         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
 920                           x->props.reqid, x->props.family);
 921         hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
 922
 923         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
 924         hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
 925
 926         if (x->id.spi) {
 927                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
 928                                   x->props.family);
 929
 930                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
 931         }
 932
 933         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
 934         if (x->replay_maxage)
 935                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
 936
 937         wake_up(&net->xfrm.km_waitq);
 938
 939         net->xfrm.state_num++;
 940
 941         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 942 }
 943
 944 /* xfrm_state_lock is held */
 945 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
 946 {
 947         struct net *net = xs_net(xnew);
 948         unsigned short family = xnew->props.family;
 949         u32 reqid = xnew->props.reqid;
 950         struct xfrm_state *x;
 951         struct hlist_node *entry;
 952         unsigned int h;
 953
 954         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
 955         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 956                 if (x->props.family     == family &&
 957                     x->props.reqid      == reqid &&
 958                     !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
 959                     !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
 960                         x->genid = xfrm_state_genid;
 961         }
 962 }
 963
 964 void xfrm_state_insert(struct xfrm_state *x)
 965 {
 966         spin_lock_bh(&xfrm_state_lock);
 967         __xfrm_state_bump_genids(x);
 968         __xfrm_state_insert(x);
 969         spin_unlock_bh(&xfrm_state_lock);
 970 }
 971 EXPORT_SYMBOL(xfrm_state_insert);
 972
 973 /* xfrm_state_lock is held */
 974 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)
 975 {
 976         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 977         struct hlist_node *entry;
 978         struct xfrm_state *x;
 979
 980         hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
 981                 if (x->props.reqid  != reqid ||
 982                     x->props.mode   != mode ||
 983                     x->props.family != family ||
 984                     x->km.state     != XFRM_STATE_ACQ ||
 985                     x->id.spi       != 0 ||
 986                     x->id.proto     != proto ||
 987                     xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
 988                     xfrm_addr_cmp(&x->props.saddr, saddr, family))
 989                         continue;
 990
 991                 xfrm_state_hold(x);
 992                 return x;
 993         }
 994
 995         if (!create)
 996                 return NULL;
 997
 998         x = xfrm_state_alloc(net);
 999         if (likely(x)) {
1000                 switch (family) {
1001                 case AF_INET:
1002                         x->sel.daddr.a4 = daddr->a4;
1003                         x->sel.saddr.a4 = saddr->a4;
1004                         x->sel.prefixlen_d = 32;
1005                         x->sel.prefixlen_s = 32;
1006                         x->props.saddr.a4 = saddr->a4;
1007                         x->id.daddr.a4 = daddr->a4;
1008                         break;
1009
1010                 case AF_INET6:
1011                         ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1012                                        (struct in6_addr *)daddr);
1013                         ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1014                                        (struct in6_addr *)saddr);
1015                         x->sel.prefixlen_d = 128;
1016                         x->sel.prefixlen_s = 128;
1017                         ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1018                                        (struct in6_addr *)saddr);
1019                         ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1020                                        (struct in6_addr *)daddr);
1021                         break;
1022                 }
1023
1024                 x->km.state = XFRM_STATE_ACQ;
1025                 x->id.proto = proto;
1026                 x->props.family = family;
1027                 x->props.mode = mode;
1028                 x->props.reqid = reqid;
1029                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1030                 xfrm_state_hold(x);
1031                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1032                 list_add(&x->km.all, &net->xfrm.state_all);
1033                 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1034                 h = xfrm_src_hash(net, daddr, saddr, family);
1035                 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1036
1037                 net->xfrm.state_num++;
1038
1039                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1040         }
1041
1042         return x;
1043 }
1044
1045 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq);
1046
1047 int xfrm_state_add(struct xfrm_state *x)
1048 {
1049         struct net *net = xs_net(x);
1050         struct xfrm_state *x1, *to_put;
1051         int family;
1052         int err;
1053         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1054
1055         family = x->props.family;
1056
1057         to_put = NULL;
1058
1059         spin_lock_bh(&xfrm_state_lock);
1060
1061         x1 = __xfrm_state_locate(x, use_spi, family);
1062         if (x1) {
1063                 to_put = x1;
1064                 x1 = NULL;
1065                 err = -EEXIST;
1066                 goto out;
1067         }
1068
1069         if (use_spi && x->km.seq) {
1070                 x1 = __xfrm_find_acq_byseq(net, x->km.seq);
1071                 if (x1 && ((x1->id.proto != x->id.proto) ||
1072                     xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1073                         to_put = x1;
1074                         x1 = NULL;
1075                 }
1076         }
1077
1078         if (use_spi && !x1)
1079                 x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid,
1080                                      x->id.proto,
1081                                      &x->id.daddr, &x->props.saddr, 0);
1082
1083         __xfrm_state_bump_genids(x);
1084         __xfrm_state_insert(x);
1085         err = 0;
1086
1087 out:
1088         spin_unlock_bh(&xfrm_state_lock);
1089
1090         if (x1) {
1091                 xfrm_state_delete(x1);
1092                 xfrm_state_put(x1);
1093         }
1094
1095         if (to_put)
1096                 xfrm_state_put(to_put);
1097
1098         return err;
1099 }
1100 EXPORT_SYMBOL(xfrm_state_add);
1101
1102 #ifdef CONFIG_XFRM_MIGRATE
1103 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1104 {
1105         struct net *net = xs_net(orig);
1106         int err = -ENOMEM;
1107         struct xfrm_state *x = xfrm_state_alloc(net);
1108         if (!x)
1109                 goto out;
1110
1111         memcpy(&x->id, &orig->id, sizeof(x->id));
1112         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1113         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1114         x->props.mode = orig->props.mode;
1115         x->props.replay_window = orig->props.replay_window;
1116         x->props.reqid = orig->props.reqid;
1117         x->props.family = orig->props.family;
1118         x->props.saddr = orig->props.saddr;
1119
1120         if (orig->aalg) {
1121                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1122                 if (!x->aalg)
1123                         goto error;
1124         }
1125         x->props.aalgo = orig->props.aalgo;
1126
1127         if (orig->ealg) {
1128                 x->ealg = xfrm_algo_clone(orig->ealg);
1129                 if (!x->ealg)
1130                         goto error;
1131         }
1132         x->props.ealgo = orig->props.ealgo;
1133
1134         if (orig->calg) {
1135                 x->calg = xfrm_algo_clone(orig->calg);
1136                 if (!x->calg)
1137                         goto error;
1138         }
1139         x->props.calgo = orig->props.calgo;
1140
1141         if (orig->encap) {
1142                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1143                 if (!x->encap)
1144                         goto error;
1145         }
1146
1147         if (orig->coaddr) {
1148                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1149                                     GFP_KERNEL);
1150                 if (!x->coaddr)
1151                         goto error;
1152         }
1153
1154         err = xfrm_init_state(x);
1155         if (err)
1156                 goto error;
1157
1158         x->props.flags = orig->props.flags;
1159
1160         x->curlft.add_time = orig->curlft.add_time;
1161         x->km.state = orig->km.state;
1162         x->km.seq = orig->km.seq;
1163
1164         return x;
1165
1166  error:
1167         xfrm_state_put(x);
1168 out:
1169         if (errp)
1170                 *errp = err;
1171         return NULL;
1172 }
1173
1174 /* xfrm_state_lock is held */
1175 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1176 {
1177         unsigned int h;
1178         struct xfrm_state *x;
1179         struct hlist_node *entry;
1180
1181         if (m->reqid) {
1182                 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1183                                   m->reqid, m->old_family);
1184                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1185                         if (x->props.mode != m->mode ||
1186                             x->id.proto != m->proto)
1187                                 continue;
1188                         if (m->reqid && x->props.reqid != m->reqid)
1189                                 continue;
1190                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1191                                           m->old_family) ||
1192                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1193                                           m->old_family))
1194                                 continue;
1195                         xfrm_state_hold(x);
1196                         return x;
1197                 }
1198         } else {
1199                 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1200                                   m->old_family);
1201                 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1202                         if (x->props.mode != m->mode ||
1203                             x->id.proto != m->proto)
1204                                 continue;
1205                         if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1206                                           m->old_family) ||
1207                             xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1208                                           m->old_family))
1209                                 continue;
1210                         xfrm_state_hold(x);
1211                         return x;
1212                 }
1213         }
1214
1215         return NULL;
1216 }
1217 EXPORT_SYMBOL(xfrm_migrate_state_find);
1218
1219 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1220                                        struct xfrm_migrate *m)
1221 {
1222         struct xfrm_state *xc;
1223         int err;
1224
1225         xc = xfrm_state_clone(x, &err);
1226         if (!xc)
1227                 return NULL;
1228
1229         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1230         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1231
1232         /* add state */
1233         if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1234                 /* a care is needed when the destination address of the
1235                    state is to be updated as it is a part of triplet */
1236                 xfrm_state_insert(xc);
1237         } else {
1238                 if ((err = xfrm_state_add(xc)) < 0)
1239                         goto error;
1240         }
1241
1242         return xc;
1243 error:
1244         kfree(xc);
1245         return NULL;
1246 }
1247 EXPORT_SYMBOL(xfrm_state_migrate);
1248 #endif
1249
1250 int xfrm_state_update(struct xfrm_state *x)
1251 {
1252         struct xfrm_state *x1, *to_put;
1253         int err;
1254         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1255
1256         to_put = NULL;
1257
1258         spin_lock_bh(&xfrm_state_lock);
1259         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1260
1261         err = -ESRCH;
1262         if (!x1)
1263                 goto out;
1264
1265         if (xfrm_state_kern(x1)) {
1266                 to_put = x1;
1267                 err = -EEXIST;
1268                 goto out;
1269         }
1270
1271         if (x1->km.state == XFRM_STATE_ACQ) {
1272                 __xfrm_state_insert(x);
1273                 x = NULL;
1274         }
1275         err = 0;
1276
1277 out:
1278         spin_unlock_bh(&xfrm_state_lock);
1279
1280         if (to_put)
1281                 xfrm_state_put(to_put);
1282
1283         if (err)
1284                 return err;
1285
1286         if (!x) {
1287                 xfrm_state_delete(x1);
1288                 xfrm_state_put(x1);
1289                 return 0;
1290         }
1291
1292         err = -EINVAL;
1293         spin_lock_bh(&x1->lock);
1294         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1295                 if (x->encap && x1->encap)
1296                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1297                 if (x->coaddr && x1->coaddr) {
1298                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1299                 }
1300                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1301                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1302                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1303                 x1->km.dying = 0;
1304
1305                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1306                 if (x1->curlft.use_time)
1307                         xfrm_state_check_expire(x1);
1308
1309                 err = 0;
1310         }
1311         spin_unlock_bh(&x1->lock);
1312
1313         xfrm_state_put(x1);
1314
1315         return err;
1316 }
1317 EXPORT_SYMBOL(xfrm_state_update);
1318
1319 int xfrm_state_check_expire(struct xfrm_state *x)
1320 {
1321         if (!x->curlft.use_time)
1322                 x->curlft.use_time = get_seconds();
1323
1324         if (x->km.state != XFRM_STATE_VALID)
1325                 return -EINVAL;
1326
1327         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1328             x->curlft.packets >= x->lft.hard_packet_limit) {
1329                 x->km.state = XFRM_STATE_EXPIRED;
1330                 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1331                 return -EINVAL;
1332         }
1333
1334         if (!x->km.dying &&
1335             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1336              x->curlft.packets >= x->lft.soft_packet_limit)) {
1337                 x->km.dying = 1;
1338                 km_state_expired(x, 0, 0);
1339         }
1340         return 0;
1341 }
1342 EXPORT_SYMBOL(xfrm_state_check_expire);
1343
1344 struct xfrm_state *
1345 xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto,
1346                   unsigned short family)
1347 {
1348         struct xfrm_state *x;
1349
1350         spin_lock_bh(&xfrm_state_lock);
1351         x = __xfrm_state_lookup(net, daddr, spi, proto, family);
1352         spin_unlock_bh(&xfrm_state_lock);
1353         return x;
1354 }
1355 EXPORT_SYMBOL(xfrm_state_lookup);
1356
1357 struct xfrm_state *
1358 xfrm_state_lookup_byaddr(struct net *net,
1359                          xfrm_address_t *daddr, xfrm_address_t *saddr,
1360                          u8 proto, unsigned short family)
1361 {
1362         struct xfrm_state *x;
1363
1364         spin_lock_bh(&xfrm_state_lock);
1365         x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family);
1366         spin_unlock_bh(&xfrm_state_lock);
1367         return x;
1368 }
1369 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1370
1371 struct xfrm_state *
1372 xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1373               xfrm_address_t *daddr, xfrm_address_t *saddr,
1374               int create, unsigned short family)
1375 {
1376         struct xfrm_state *x;
1377
1378         spin_lock_bh(&xfrm_state_lock);
1379         x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create);
1380         spin_unlock_bh(&xfrm_state_lock);
1381
1382         return x;
1383 }
1384 EXPORT_SYMBOL(xfrm_find_acq);
1385
1386 #ifdef CONFIG_XFRM_SUB_POLICY
1387 int
1388 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1389                unsigned short family)
1390 {
1391         int err = 0;
1392         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1393         if (!afinfo)
1394                 return -EAFNOSUPPORT;
1395
1396         spin_lock_bh(&xfrm_state_lock);
1397         if (afinfo->tmpl_sort)
1398                 err = afinfo->tmpl_sort(dst, src, n);
1399         spin_unlock_bh(&xfrm_state_lock);
1400         xfrm_state_put_afinfo(afinfo);
1401         return err;
1402 }
1403 EXPORT_SYMBOL(xfrm_tmpl_sort);
1404
1405 int
1406 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1407                 unsigned short family)
1408 {
1409         int err = 0;
1410         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1411         if (!afinfo)
1412                 return -EAFNOSUPPORT;
1413
1414         spin_lock_bh(&xfrm_state_lock);
1415         if (afinfo->state_sort)
1416                 err = afinfo->state_sort(dst, src, n);
1417         spin_unlock_bh(&xfrm_state_lock);
1418         xfrm_state_put_afinfo(afinfo);
1419         return err;
1420 }
1421 EXPORT_SYMBOL(xfrm_state_sort);
1422 #endif
1423
1424 /* Silly enough, but I'm lazy to build resolution list */
1425
1426 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq)
1427 {
1428         int i;
1429
1430         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1431                 struct hlist_node *entry;
1432                 struct xfrm_state *x;
1433
1434                 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1435                         if (x->km.seq == seq &&
1436                             x->km.state == XFRM_STATE_ACQ) {
1437                                 xfrm_state_hold(x);
1438                                 return x;
1439                         }
1440                 }
1441         }
1442         return NULL;
1443 }
1444
1445 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq)
1446 {
1447         struct xfrm_state *x;
1448
1449         spin_lock_bh(&xfrm_state_lock);
1450         x = __xfrm_find_acq_byseq(net, seq);
1451         spin_unlock_bh(&xfrm_state_lock);
1452         return x;
1453 }
1454 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1455
1456 u32 xfrm_get_acqseq(void)
1457 {
1458         u32 res;
1459         static atomic_t acqseq;
1460
1461         do {
1462                 res = atomic_inc_return(&acqseq);
1463         } while (!res);
1464
1465         return res;
1466 }
1467 EXPORT_SYMBOL(xfrm_get_acqseq);
1468
1469 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1470 {
1471         struct net *net = xs_net(x);
1472         unsigned int h;
1473         struct xfrm_state *x0;
1474         int err = -ENOENT;
1475         __be32 minspi = htonl(low);
1476         __be32 maxspi = htonl(high);
1477
1478         spin_lock_bh(&x->lock);
1479         if (x->km.state == XFRM_STATE_DEAD)
1480                 goto unlock;
1481
1482         err = 0;
1483         if (x->id.spi)
1484                 goto unlock;
1485
1486         err = -ENOENT;
1487
1488         if (minspi == maxspi) {
1489                 x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family);
1490                 if (x0) {
1491                         xfrm_state_put(x0);
1492                         goto unlock;
1493                 }
1494                 x->id.spi = minspi;
1495         } else {
1496                 u32 spi = 0;
1497                 for (h=0; h<high-low+1; h++) {
1498                         spi = low + net_random()%(high-low+1);
1499                         x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1500                         if (x0 == NULL) {
1501                                 x->id.spi = htonl(spi);
1502                                 break;
1503                         }
1504                         xfrm_state_put(x0);
1505                 }
1506         }
1507         if (x->id.spi) {
1508                 spin_lock_bh(&xfrm_state_lock);
1509                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1510                 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1511                 spin_unlock_bh(&xfrm_state_lock);
1512
1513                 err = 0;
1514         }
1515
1516 unlock:
1517         spin_unlock_bh(&x->lock);
1518
1519         return err;
1520 }
1521 EXPORT_SYMBOL(xfrm_alloc_spi);
1522
1523 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1524                     int (*func)(struct xfrm_state *, int, void*),
1525                     void *data)
1526 {
1527         struct xfrm_state *state;
1528         struct xfrm_state_walk *x;
1529         int err = 0;
1530
1531         if (walk->seq != 0 && list_empty(&walk->all))
1532                 return 0;
1533
1534         spin_lock_bh(&xfrm_state_lock);
1535         if (list_empty(&walk->all))
1536                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1537         else
1538                 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1539         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1540                 if (x->state == XFRM_STATE_DEAD)
1541                         continue;
1542                 state = container_of(x, struct xfrm_state, km);
1543                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1544                         continue;
1545                 err = func(state, walk->seq, data);
1546                 if (err) {
1547                         list_move_tail(&walk->all, &x->all);
1548                         goto out;
1549                 }
1550                 walk->seq++;
1551         }
1552         if (walk->seq == 0) {
1553                 err = -ENOENT;
1554                 goto out;
1555         }
1556         list_del_init(&walk->all);
1557 out:
1558         spin_unlock_bh(&xfrm_state_lock);
1559         return err;
1560 }
1561 EXPORT_SYMBOL(xfrm_state_walk);
1562
1563 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1564 {
1565         INIT_LIST_HEAD(&walk->all);
1566         walk->proto = proto;
1567         walk->state = XFRM_STATE_DEAD;
1568         walk->seq = 0;
1569 }
1570 EXPORT_SYMBOL(xfrm_state_walk_init);
1571
1572 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1573 {
1574         if (list_empty(&walk->all))
1575                 return;
1576
1577         spin_lock_bh(&xfrm_state_lock);
1578         list_del(&walk->all);
1579         spin_unlock_bh(&xfrm_state_lock);
1580 }
1581 EXPORT_SYMBOL(xfrm_state_walk_done);
1582
1583
1584 void xfrm_replay_notify(struct xfrm_state *x, int event)
1585 {
1586         struct km_event c;
1587         /* we send notify messages in case
1588          *  1. we updated on of the sequence numbers, and the seqno difference
1589          *     is at least x->replay_maxdiff, in this case we also update the
1590          *     timeout of our timer function
1591          *  2. if x->replay_maxage has elapsed since last update,
1592          *     and there were changes
1593          *
1594          *  The state structure must be locked!
1595          */
1596
1597         switch (event) {
1598         case XFRM_REPLAY_UPDATE:
1599                 if (x->replay_maxdiff &&
1600                     (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1601                     (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1602                         if (x->xflags & XFRM_TIME_DEFER)
1603                                 event = XFRM_REPLAY_TIMEOUT;
1604                         else
1605                                 return;
1606                 }
1607
1608                 break;
1609
1610         case XFRM_REPLAY_TIMEOUT:
1611                 if ((x->replay.seq == x->preplay.seq) &&
1612                     (x->replay.bitmap == x->preplay.bitmap) &&
1613                     (x->replay.oseq == x->preplay.oseq)) {
1614                         x->xflags |= XFRM_TIME_DEFER;
1615                         return;
1616                 }
1617
1618                 break;
1619         }
1620
1621         memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1622         c.event = XFRM_MSG_NEWAE;
1623         c.data.aevent = event;
1624         km_state_notify(x, &c);
1625
1626         if (x->replay_maxage &&
1627             !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1628                 x->xflags &= ~XFRM_TIME_DEFER;
1629 }
1630
1631 static void xfrm_replay_timer_handler(unsigned long data)
1632 {
1633         struct xfrm_state *x = (struct xfrm_state*)data;
1634
1635         spin_lock(&x->lock);
1636
1637         if (x->km.state == XFRM_STATE_VALID) {
1638                 if (xfrm_aevent_is_on(xs_net(x)))
1639                         xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1640                 else
1641                         x->xflags |= XFRM_TIME_DEFER;
1642         }
1643
1644         spin_unlock(&x->lock);
1645 }
1646
1647 int xfrm_replay_check(struct xfrm_state *x,
1648                       struct sk_buff *skb, __be32 net_seq)
1649 {
1650         u32 diff;
1651         u32 seq = ntohl(net_seq);
1652
1653         if (unlikely(seq == 0))
1654                 goto err;
1655
1656         if (likely(seq > x->replay.seq))
1657                 return 0;
1658
1659         diff = x->replay.seq - seq;
1660         if (diff >= min_t(unsigned int, x->props.replay_window,
1661                           sizeof(x->replay.bitmap) * 8)) {
1662                 x->stats.replay_window++;
1663                 goto err;
1664         }
1665
1666         if (x->replay.bitmap & (1U << diff)) {
1667                 x->stats.replay++;
1668                 goto err;
1669         }
1670         return 0;
1671
1672 err:
1673         xfrm_audit_state_replay(x, skb, net_seq);
1674         return -EINVAL;
1675 }
1676
1677 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1678 {
1679         u32 diff;
1680         u32 seq = ntohl(net_seq);
1681
1682         if (seq > x->replay.seq) {
1683                 diff = seq - x->replay.seq;
1684                 if (diff < x->props.replay_window)
1685                         x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1686                 else
1687                         x->replay.bitmap = 1;
1688                 x->replay.seq = seq;
1689         } else {
1690                 diff = x->replay.seq - seq;
1691                 x->replay.bitmap |= (1U << diff);
1692         }
1693
1694         if (xfrm_aevent_is_on(xs_net(x)))
1695                 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1696 }
1697
1698 static LIST_HEAD(xfrm_km_list);
1699 static DEFINE_RWLOCK(xfrm_km_lock);
1700
1701 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1702 {
1703         struct xfrm_mgr *km;
1704
1705         read_lock(&xfrm_km_lock);
1706         list_for_each_entry(km, &xfrm_km_list, list)
1707                 if (km->notify_policy)
1708                         km->notify_policy(xp, dir, c);
1709         read_unlock(&xfrm_km_lock);
1710 }
1711
1712 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1713 {
1714         struct xfrm_mgr *km;
1715         read_lock(&xfrm_km_lock);
1716         list_for_each_entry(km, &xfrm_km_list, list)
1717                 if (km->notify)
1718                         km->notify(x, c);
1719         read_unlock(&xfrm_km_lock);
1720 }
1721
1722 EXPORT_SYMBOL(km_policy_notify);
1723 EXPORT_SYMBOL(km_state_notify);
1724
1725 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1726 {
1727         struct net *net = xs_net(x);
1728         struct km_event c;
1729
1730         c.data.hard = hard;
1731         c.pid = pid;
1732         c.event = XFRM_MSG_EXPIRE;
1733         km_state_notify(x, &c);
1734
1735         if (hard)
1736                 wake_up(&net->xfrm.km_waitq);
1737 }
1738
1739 EXPORT_SYMBOL(km_state_expired);
1740 /*
1741  * We send to all registered managers regardless of failure
1742  * We are happy with one success
1743 */
1744 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1745 {
1746         int err = -EINVAL, acqret;
1747         struct xfrm_mgr *km;
1748
1749         read_lock(&xfrm_km_lock);
1750         list_for_each_entry(km, &xfrm_km_list, list) {
1751                 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1752                 if (!acqret)
1753                         err = acqret;
1754         }
1755         read_unlock(&xfrm_km_lock);
1756         return err;
1757 }
1758 EXPORT_SYMBOL(km_query);
1759
1760 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1761 {
1762         int err = -EINVAL;
1763         struct xfrm_mgr *km;
1764
1765         read_lock(&xfrm_km_lock);
1766         list_for_each_entry(km, &xfrm_km_list, list) {
1767                 if (km->new_mapping)
1768                         err = km->new_mapping(x, ipaddr, sport);
1769                 if (!err)
1770                         break;
1771         }
1772         read_unlock(&xfrm_km_lock);
1773         return err;
1774 }
1775 EXPORT_SYMBOL(km_new_mapping);
1776
1777 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1778 {
1779         struct net *net = xp_net(pol);
1780         struct km_event c;
1781
1782         c.data.hard = hard;
1783         c.pid = pid;
1784         c.event = XFRM_MSG_POLEXPIRE;
1785         km_policy_notify(pol, dir, &c);
1786
1787         if (hard)
1788                 wake_up(&net->xfrm.km_waitq);
1789 }
1790 EXPORT_SYMBOL(km_policy_expired);
1791
1792 #ifdef CONFIG_XFRM_MIGRATE
1793 int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1794                struct xfrm_migrate *m, int num_migrate,
1795                struct xfrm_kmaddress *k)
1796 {
1797         int err = -EINVAL;
1798         int ret;
1799         struct xfrm_mgr *km;
1800
1801         read_lock(&xfrm_km_lock);
1802         list_for_each_entry(km, &xfrm_km_list, list) {
1803                 if (km->migrate) {
1804                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1805                         if (!ret)
1806                                 err = ret;
1807                 }
1808         }
1809         read_unlock(&xfrm_km_lock);
1810         return err;
1811 }
1812 EXPORT_SYMBOL(km_migrate);
1813 #endif
1814
1815 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1816 {
1817         int err = -EINVAL;
1818         int ret;
1819         struct xfrm_mgr *km;
1820
1821         read_lock(&xfrm_km_lock);
1822         list_for_each_entry(km, &xfrm_km_list, list) {
1823                 if (km->report) {
1824                         ret = km->report(net, proto, sel, addr);
1825                         if (!ret)
1826                                 err = ret;
1827                 }
1828         }
1829         read_unlock(&xfrm_km_lock);
1830         return err;
1831 }
1832 EXPORT_SYMBOL(km_report);
1833
1834 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1835 {
1836         int err;
1837         u8 *data;
1838         struct xfrm_mgr *km;
1839         struct xfrm_policy *pol = NULL;
1840
1841         if (optlen <= 0 || optlen > PAGE_SIZE)
1842                 return -EMSGSIZE;
1843
1844         data = kmalloc(optlen, GFP_KERNEL);
1845         if (!data)
1846                 return -ENOMEM;
1847
1848         err = -EFAULT;
1849         if (copy_from_user(data, optval, optlen))
1850                 goto out;
1851
1852         err = -EINVAL;
1853         read_lock(&xfrm_km_lock);
1854         list_for_each_entry(km, &xfrm_km_list, list) {
1855                 pol = km->compile_policy(sk, optname, data,
1856                                          optlen, &err);
1857                 if (err >= 0)
1858                         break;
1859         }
1860         read_unlock(&xfrm_km_lock);
1861
1862         if (err >= 0) {
1863                 xfrm_sk_policy_insert(sk, err, pol);
1864                 xfrm_pol_put(pol);
1865                 err = 0;
1866         }
1867
1868 out:
1869         kfree(data);
1870         return err;
1871 }
1872 EXPORT_SYMBOL(xfrm_user_policy);
1873
1874 int xfrm_register_km(struct xfrm_mgr *km)
1875 {
1876         write_lock_bh(&xfrm_km_lock);
1877         list_add_tail(&km->list, &xfrm_km_list);
1878         write_unlock_bh(&xfrm_km_lock);
1879         return 0;
1880 }
1881 EXPORT_SYMBOL(xfrm_register_km);
1882
1883 int xfrm_unregister_km(struct xfrm_mgr *km)
1884 {
1885         write_lock_bh(&xfrm_km_lock);
1886         list_del(&km->list);
1887         write_unlock_bh(&xfrm_km_lock);
1888         return 0;
1889 }
1890 EXPORT_SYMBOL(xfrm_unregister_km);
1891
1892 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1893 {
1894         int err = 0;
1895         if (unlikely(afinfo == NULL))
1896                 return -EINVAL;
1897         if (unlikely(afinfo->family >= NPROTO))
1898                 return -EAFNOSUPPORT;
1899         write_lock_bh(&xfrm_state_afinfo_lock);
1900         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1901                 err = -ENOBUFS;
1902         else
1903                 xfrm_state_afinfo[afinfo->family] = afinfo;
1904         write_unlock_bh(&xfrm_state_afinfo_lock);
1905         return err;
1906 }
1907 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1908
1909 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1910 {
1911         int err = 0;
1912         if (unlikely(afinfo == NULL))
1913                 return -EINVAL;
1914         if (unlikely(afinfo->family >= NPROTO))
1915                 return -EAFNOSUPPORT;
1916         write_lock_bh(&xfrm_state_afinfo_lock);
1917         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1918                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1919                         err = -EINVAL;
1920                 else
1921                         xfrm_state_afinfo[afinfo->family] = NULL;
1922         }
1923         write_unlock_bh(&xfrm_state_afinfo_lock);
1924         return err;
1925 }
1926 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1927
1928 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1929 {
1930         struct xfrm_state_afinfo *afinfo;
1931         if (unlikely(family >= NPROTO))
1932                 return NULL;
1933         read_lock(&xfrm_state_afinfo_lock);
1934         afinfo = xfrm_state_afinfo[family];
1935         if (unlikely(!afinfo))
1936                 read_unlock(&xfrm_state_afinfo_lock);
1937         return afinfo;
1938 }
1939
1940 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1941         __releases(xfrm_state_afinfo_lock)
1942 {
1943         read_unlock(&xfrm_state_afinfo_lock);
1944 }
1945
1946 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1947 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1948 {
1949         if (x->tunnel) {
1950                 struct xfrm_state *t = x->tunnel;
1951
1952                 if (atomic_read(&t->tunnel_users) == 2)
1953                         xfrm_state_delete(t);
1954                 atomic_dec(&t->tunnel_users);
1955                 xfrm_state_put(t);
1956                 x->tunnel = NULL;
1957         }
1958 }
1959 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1960
1961 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1962 {
1963         int res;
1964
1965         spin_lock_bh(&x->lock);
1966         if (x->km.state == XFRM_STATE_VALID &&
1967             x->type && x->type->get_mtu)
1968                 res = x->type->get_mtu(x, mtu);
1969         else
1970                 res = mtu - x->props.header_len;
1971         spin_unlock_bh(&x->lock);
1972         return res;
1973 }
1974
1975 int xfrm_init_state(struct xfrm_state *x)
1976 {
1977         struct xfrm_state_afinfo *afinfo;
1978         struct xfrm_mode *inner_mode;
1979         int family = x->props.family;
1980         int err;
1981
1982         err = -EAFNOSUPPORT;
1983         afinfo = xfrm_state_get_afinfo(family);
1984         if (!afinfo)
1985                 goto error;
1986
1987         err = 0;
1988         if (afinfo->init_flags)
1989                 err = afinfo->init_flags(x);
1990
1991         xfrm_state_put_afinfo(afinfo);
1992
1993         if (err)
1994                 goto error;
1995
1996         err = -EPROTONOSUPPORT;
1997
1998         if (x->sel.family != AF_UNSPEC) {
1999                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2000                 if (inner_mode == NULL)
2001                         goto error;
2002
2003                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2004                     family != x->sel.family) {
2005                         xfrm_put_mode(inner_mode);
2006                         goto error;
2007                 }
2008
2009                 x->inner_mode = inner_mode;
2010         } else {
2011                 struct xfrm_mode *inner_mode_iaf;
2012                 int iafamily = AF_INET;
2013
2014                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2015                 if (inner_mode == NULL)
2016                         goto error;
2017
2018                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2019                         xfrm_put_mode(inner_mode);
2020                         goto error;
2021                 }
2022                 x->inner_mode = inner_mode;
2023
2024                 if (x->props.family == AF_INET)
2025                         iafamily = AF_INET6;
2026
2027                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2028                 if (inner_mode_iaf) {
2029                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2030                                 x->inner_mode_iaf = inner_mode_iaf;
2031                         else
2032                                 xfrm_put_mode(inner_mode_iaf);
2033                 }
2034         }
2035
2036         x->type = xfrm_get_type(x->id.proto, family);
2037         if (x->type == NULL)
2038                 goto error;
2039
2040         err = x->type->init_state(x);
2041         if (err)
2042                 goto error;
2043
2044         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2045         if (x->outer_mode == NULL)
2046                 goto error;
2047
2048         x->km.state = XFRM_STATE_VALID;
2049
2050 error:
2051         return err;
2052 }
2053
2054 EXPORT_SYMBOL(xfrm_init_state);
2055
2056 int __net_init xfrm_state_init(struct net *net)
2057 {
2058         unsigned int sz;
2059
2060         INIT_LIST_HEAD(&net->xfrm.state_all);
2061
2062         sz = sizeof(struct hlist_head) * 8;
2063
2064         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2065         if (!net->xfrm.state_bydst)
2066                 goto out_bydst;
2067         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2068         if (!net->xfrm.state_bysrc)
2069                 goto out_bysrc;
2070         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2071         if (!net->xfrm.state_byspi)
2072                 goto out_byspi;
2073         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2074
2075         net->xfrm.state_num = 0;
2076         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2077         INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2078         INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2079         init_waitqueue_head(&net->xfrm.km_waitq);
2080         return 0;
2081
2082 out_byspi:
2083         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2084 out_bysrc:
2085         xfrm_hash_free(net->xfrm.state_bydst, sz);
2086 out_bydst:
2087         return -ENOMEM;
2088 }
2089
2090 void xfrm_state_fini(struct net *net)
2091 {
2092         struct xfrm_audit audit_info;
2093         unsigned int sz;
2094
2095         flush_work(&net->xfrm.state_hash_work);
2096         audit_info.loginuid = -1;
2097         audit_info.sessionid = -1;
2098         audit_info.secid = 0;
2099         xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2100         flush_work(&net->xfrm.state_gc_work);
2101
2102         WARN_ON(!list_empty(&net->xfrm.state_all));
2103
2104         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2105         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2106         xfrm_hash_free(net->xfrm.state_byspi, sz);
2107         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2108         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2109         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2110         xfrm_hash_free(net->xfrm.state_bydst, sz);
2111 }
2112
2113 #ifdef CONFIG_AUDITSYSCALL
2114 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2115                                      struct audit_buffer *audit_buf)
2116 {
2117         struct xfrm_sec_ctx *ctx = x->security;
2118         u32 spi = ntohl(x->id.spi);
2119
2120         if (ctx)
2121                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2122                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2123
2124         switch(x->props.family) {
2125         case AF_INET:
2126                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2127                                  &x->props.saddr.a4, &x->id.daddr.a4);
2128                 break;
2129         case AF_INET6:
2130                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2131                                  x->props.saddr.a6, x->id.daddr.a6);
2132                 break;
2133         }
2134
2135         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2136 }
2137
2138 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2139                                       struct audit_buffer *audit_buf)
2140 {
2141         struct iphdr *iph4;
2142         struct ipv6hdr *iph6;
2143
2144         switch (family) {
2145         case AF_INET:
2146                 iph4 = ip_hdr(skb);
2147                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2148                                  &iph4->saddr, &iph4->daddr);
2149                 break;
2150         case AF_INET6:
2151                 iph6 = ipv6_hdr(skb);
2152                 audit_log_format(audit_buf,
2153                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2154                                  &iph6->saddr,&iph6->daddr,
2155                                  iph6->flow_lbl[0] & 0x0f,
2156                                  iph6->flow_lbl[1],
2157                                  iph6->flow_lbl[2]);
2158                 break;
2159         }
2160 }
2161
2162 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2163                           uid_t auid, u32 sessionid, u32 secid)
2164 {
2165         struct audit_buffer *audit_buf;
2166
2167         audit_buf = xfrm_audit_start("SAD-add");
2168         if (audit_buf == NULL)
2169                 return;
2170         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2171         xfrm_audit_helper_sainfo(x, audit_buf);
2172         audit_log_format(audit_buf, " res=%u", result);
2173         audit_log_end(audit_buf);
2174 }
2175 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2176
2177 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2178                              uid_t auid, u32 sessionid, u32 secid)
2179 {
2180         struct audit_buffer *audit_buf;
2181
2182         audit_buf = xfrm_audit_start("SAD-delete");
2183         if (audit_buf == NULL)
2184                 return;
2185         xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2186         xfrm_audit_helper_sainfo(x, audit_buf);
2187         audit_log_format(audit_buf, " res=%u", result);
2188         audit_log_end(audit_buf);
2189 }
2190 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2191
2192 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2193                                       struct sk_buff *skb)
2194 {
2195         struct audit_buffer *audit_buf;
2196         u32 spi;
2197
2198         audit_buf = xfrm_audit_start("SA-replay-overflow");
2199         if (audit_buf == NULL)
2200                 return;
2201         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2202         /* don't record the sequence number because it's inherent in this kind
2203          * of audit message */
2204         spi = ntohl(x->id.spi);
2205         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2206         audit_log_end(audit_buf);
2207 }
2208 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2209
2210 static void xfrm_audit_state_replay(struct xfrm_state *x,
2211                              struct sk_buff *skb, __be32 net_seq)
2212 {
2213         struct audit_buffer *audit_buf;
2214         u32 spi;
2215
2216         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2217         if (audit_buf == NULL)
2218                 return;
2219         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2220         spi = ntohl(x->id.spi);
2221         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2222                          spi, spi, ntohl(net_seq));
2223         audit_log_end(audit_buf);
2224 }
2225
2226 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2227 {
2228         struct audit_buffer *audit_buf;
2229
2230         audit_buf = xfrm_audit_start("SA-notfound");
2231         if (audit_buf == NULL)
2232                 return;
2233         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2234         audit_log_end(audit_buf);
2235 }
2236 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2237
2238 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2239                                __be32 net_spi, __be32 net_seq)
2240 {
2241         struct audit_buffer *audit_buf;
2242         u32 spi;
2243
2244         audit_buf = xfrm_audit_start("SA-notfound");
2245         if (audit_buf == NULL)
2246                 return;
2247         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2248         spi = ntohl(net_spi);
2249         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2250                          spi, spi, ntohl(net_seq));
2251         audit_log_end(audit_buf);
2252 }
2253 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2254
2255 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2256                               struct sk_buff *skb, u8 proto)
2257 {
2258         struct audit_buffer *audit_buf;
2259         __be32 net_spi;
2260         __be32 net_seq;
2261
2262         audit_buf = xfrm_audit_start("SA-icv-failure");
2263         if (audit_buf == NULL)
2264                 return;
2265         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2266         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2267                 u32 spi = ntohl(net_spi);
2268                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2269                                  spi, spi, ntohl(net_seq));
2270         }
2271         audit_log_end(audit_buf);
2272 }
2273 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2274 #endif /* CONFIG_AUDITSYSCALL */