net/xfrm/xfrm_state.c

   1 /*
   2  * xfrm_state.c
   3  *
   4  * Changes:
   5  *      Mitsuru KANDA @USAGI
   6  *      Kazunori MIYAZAWA @USAGI
   7  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   8  *              IPv6 support
   9  *      YOSHIFUJI Hideaki @USAGI
  10  *              Split up af-specific functions
  11  *      Derek Atkins <derek@ihtfp.com>
  12  *              Add UDP Encapsulation
  13  *
  14  */
  15
  16 #include <linux/workqueue.h>
  17 #include <net/xfrm.h>
  18 #include <linux/pfkeyv2.h>
  19 #include <linux/ipsec.h>
  20 #include <linux/module.h>
  21 #include <linux/cache.h>
  22 #include <linux/audit.h>
  23 #include <asm/uaccess.h>
  24 #include <linux/ktime.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/kernel.h>
  28
  29 #include "xfrm_hash.h"
  30
  31 #define xfrm_state_deref_prot(table, net) \
  32         rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
  33
  34 static void xfrm_state_gc_task(struct work_struct *work);
  35
  36 /* Each xfrm_state may be linked to two tables:
  37
  38    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
  39    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
  40       destination/tunnel endpoint. (output)
  41  */
  42
  43 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  44 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
  45
  46 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
  47 static HLIST_HEAD(xfrm_state_gc_list);
  48
  49 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
  50 {
  51         return atomic_inc_not_zero(&x->refcnt);
  52 }
  53
  54 static inline unsigned int xfrm_dst_hash(struct net *net,
  55                                          const xfrm_address_t *daddr,
  56                                          const xfrm_address_t *saddr,
  57                                          u32 reqid,
  58                                          unsigned short family)
  59 {
  60         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  61 }
  62
  63 static inline unsigned int xfrm_src_hash(struct net *net,
  64                                          const xfrm_address_t *daddr,
  65                                          const xfrm_address_t *saddr,
  66                                          unsigned short family)
  67 {
  68         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  69 }
  70
  71 static inline unsigned int
  72 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
  73               __be32 spi, u8 proto, unsigned short family)
  74 {
  75         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  76 }
  77
  78 static void xfrm_hash_transfer(struct hlist_head *list,
  79                                struct hlist_head *ndsttable,
  80                                struct hlist_head *nsrctable,
  81                                struct hlist_head *nspitable,
  82                                unsigned int nhashmask)
  83 {
  84         struct hlist_node *tmp;
  85         struct xfrm_state *x;
  86
  87         hlist_for_each_entry_safe(x, tmp, list, bydst) {
  88                 unsigned int h;
  89
  90                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
  91                                     x->props.reqid, x->props.family,
  92                                     nhashmask);
  93                 hlist_add_head_rcu(&x->bydst, ndsttable + h);
  94
  95                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
  96                                     x->props.family,
  97                                     nhashmask);
  98                 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
  99
 100                 if (x->id.spi) {
 101                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
 102                                             x->id.proto, x->props.family,
 103                                             nhashmask);
 104                         hlist_add_head_rcu(&x->byspi, nspitable + h);
 105                 }
 106         }
 107 }
 108
 109 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 110 {
 111         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 112 }
 113
 114 static void xfrm_hash_resize(struct work_struct *work)
 115 {
 116         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 117         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
 118         unsigned long nsize, osize;
 119         unsigned int nhashmask, ohashmask;
 120         int i;
 121
 122         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 123         ndst = xfrm_hash_alloc(nsize);
 124         if (!ndst)
 125                 return;
 126         nsrc = xfrm_hash_alloc(nsize);
 127         if (!nsrc) {
 128                 xfrm_hash_free(ndst, nsize);
 129                 return;
 130         }
 131         nspi = xfrm_hash_alloc(nsize);
 132         if (!nspi) {
 133                 xfrm_hash_free(ndst, nsize);
 134                 xfrm_hash_free(nsrc, nsize);
 135                 return;
 136         }
 137
 138         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 139         write_seqcount_begin(&xfrm_state_hash_generation);
 140
 141         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 142         odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
 143         for (i = net->xfrm.state_hmask; i >= 0; i--)
 144                 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
 145
 146         osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
 147         ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
 148         ohashmask = net->xfrm.state_hmask;
 149
 150         rcu_assign_pointer(net->xfrm.state_bydst, ndst);
 151         rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
 152         rcu_assign_pointer(net->xfrm.state_byspi, nspi);
 153         net->xfrm.state_hmask = nhashmask;
 154
 155         write_seqcount_end(&xfrm_state_hash_generation);
 156         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 157
 158         osize = (ohashmask + 1) * sizeof(struct hlist_head);
 159
 160         synchronize_rcu();
 161
 162         xfrm_hash_free(odst, osize);
 163         xfrm_hash_free(osrc, osize);
 164         xfrm_hash_free(ospi, osize);
 165 }
 166
 167 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
 168 static struct xfrm_state_afinfo __rcu *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 bool km_is_alive(const struct km_event *c);
 176 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 177
 178 static DEFINE_SPINLOCK(xfrm_type_lock);
 179 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 180 {
 181         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 182         const struct xfrm_type **typemap;
 183         int err = 0;
 184
 185         if (unlikely(afinfo == NULL))
 186                 return -EAFNOSUPPORT;
 187         typemap = afinfo->type_map;
 188         spin_lock_bh(&xfrm_type_lock);
 189
 190         if (likely(typemap[type->proto] == NULL))
 191                 typemap[type->proto] = type;
 192         else
 193                 err = -EEXIST;
 194         spin_unlock_bh(&xfrm_type_lock);
 195         xfrm_state_put_afinfo(afinfo);
 196         return err;
 197 }
 198 EXPORT_SYMBOL(xfrm_register_type);
 199
 200 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 201 {
 202         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 203         const struct xfrm_type **typemap;
 204         int err = 0;
 205
 206         if (unlikely(afinfo == NULL))
 207                 return -EAFNOSUPPORT;
 208         typemap = afinfo->type_map;
 209         spin_lock_bh(&xfrm_type_lock);
 210
 211         if (unlikely(typemap[type->proto] != type))
 212                 err = -ENOENT;
 213         else
 214                 typemap[type->proto] = NULL;
 215         spin_unlock_bh(&xfrm_type_lock);
 216         xfrm_state_put_afinfo(afinfo);
 217         return err;
 218 }
 219 EXPORT_SYMBOL(xfrm_unregister_type);
 220
 221 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 222 {
 223         struct xfrm_state_afinfo *afinfo;
 224         const struct xfrm_type **typemap;
 225         const struct xfrm_type *type;
 226         int modload_attempted = 0;
 227
 228 retry:
 229         afinfo = xfrm_state_get_afinfo(family);
 230         if (unlikely(afinfo == NULL))
 231                 return NULL;
 232         typemap = afinfo->type_map;
 233
 234         type = typemap[proto];
 235         if (unlikely(type && !try_module_get(type->owner)))
 236                 type = NULL;
 237         if (!type && !modload_attempted) {
 238                 xfrm_state_put_afinfo(afinfo);
 239                 request_module("xfrm-type-%d-%d", family, proto);
 240                 modload_attempted = 1;
 241                 goto retry;
 242         }
 243
 244         xfrm_state_put_afinfo(afinfo);
 245         return type;
 246 }
 247
 248 static void xfrm_put_type(const struct xfrm_type *type)
 249 {
 250         module_put(type->owner);
 251 }
 252
 253 static DEFINE_SPINLOCK(xfrm_mode_lock);
 254 int xfrm_register_mode(struct xfrm_mode *mode, int family)
 255 {
 256         struct xfrm_state_afinfo *afinfo;
 257         struct xfrm_mode **modemap;
 258         int err;
 259
 260         if (unlikely(mode->encap >= XFRM_MODE_MAX))
 261                 return -EINVAL;
 262
 263         afinfo = xfrm_state_get_afinfo(family);
 264         if (unlikely(afinfo == NULL))
 265                 return -EAFNOSUPPORT;
 266
 267         err = -EEXIST;
 268         modemap = afinfo->mode_map;
 269         spin_lock_bh(&xfrm_mode_lock);
 270         if (modemap[mode->encap])
 271                 goto out;
 272
 273         err = -ENOENT;
 274         if (!try_module_get(afinfo->owner))
 275                 goto out;
 276
 277         mode->afinfo = afinfo;
 278         modemap[mode->encap] = mode;
 279         err = 0;
 280
 281 out:
 282         spin_unlock_bh(&xfrm_mode_lock);
 283         xfrm_state_put_afinfo(afinfo);
 284         return err;
 285 }
 286 EXPORT_SYMBOL(xfrm_register_mode);
 287
 288 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
 289 {
 290         struct xfrm_state_afinfo *afinfo;
 291         struct xfrm_mode **modemap;
 292         int err;
 293
 294         if (unlikely(mode->encap >= XFRM_MODE_MAX))
 295                 return -EINVAL;
 296
 297         afinfo = xfrm_state_get_afinfo(family);
 298         if (unlikely(afinfo == NULL))
 299                 return -EAFNOSUPPORT;
 300
 301         err = -ENOENT;
 302         modemap = afinfo->mode_map;
 303         spin_lock_bh(&xfrm_mode_lock);
 304         if (likely(modemap[mode->encap] == mode)) {
 305                 modemap[mode->encap] = NULL;
 306                 module_put(mode->afinfo->owner);
 307                 err = 0;
 308         }
 309
 310         spin_unlock_bh(&xfrm_mode_lock);
 311         xfrm_state_put_afinfo(afinfo);
 312         return err;
 313 }
 314 EXPORT_SYMBOL(xfrm_unregister_mode);
 315
 316 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 317 {
 318         struct xfrm_state_afinfo *afinfo;
 319         struct xfrm_mode *mode;
 320         int modload_attempted = 0;
 321
 322         if (unlikely(encap >= XFRM_MODE_MAX))
 323                 return NULL;
 324
 325 retry:
 326         afinfo = xfrm_state_get_afinfo(family);
 327         if (unlikely(afinfo == NULL))
 328                 return NULL;
 329
 330         mode = afinfo->mode_map[encap];
 331         if (unlikely(mode && !try_module_get(mode->owner)))
 332                 mode = NULL;
 333         if (!mode && !modload_attempted) {
 334                 xfrm_state_put_afinfo(afinfo);
 335                 request_module("xfrm-mode-%d-%d", family, encap);
 336                 modload_attempted = 1;
 337                 goto retry;
 338         }
 339
 340         xfrm_state_put_afinfo(afinfo);
 341         return mode;
 342 }
 343
 344 static void xfrm_put_mode(struct xfrm_mode *mode)
 345 {
 346         module_put(mode->owner);
 347 }
 348
 349 static void xfrm_state_gc_destroy(struct xfrm_state *x)
 350 {
 351         tasklet_hrtimer_cancel(&x->mtimer);
 352         del_timer_sync(&x->rtimer);
 353         kfree(x->aead);
 354         kfree(x->aalg);
 355         kfree(x->ealg);
 356         kfree(x->calg);
 357         kfree(x->encap);
 358         kfree(x->coaddr);
 359         kfree(x->replay_esn);
 360         kfree(x->preplay_esn);
 361         if (x->inner_mode)
 362                 xfrm_put_mode(x->inner_mode);
 363         if (x->inner_mode_iaf)
 364                 xfrm_put_mode(x->inner_mode_iaf);
 365         if (x->outer_mode)
 366                 xfrm_put_mode(x->outer_mode);
 367         if (x->type) {
 368                 x->type->destructor(x);
 369                 xfrm_put_type(x->type);
 370         }
 371         security_xfrm_state_free(x);
 372         kfree(x);
 373 }
 374
 375 static void xfrm_state_gc_task(struct work_struct *work)
 376 {
 377         struct xfrm_state *x;
 378         struct hlist_node *tmp;
 379         struct hlist_head gc_list;
 380
 381         spin_lock_bh(&xfrm_state_gc_lock);
 382         hlist_move_list(&xfrm_state_gc_list, &gc_list);
 383         spin_unlock_bh(&xfrm_state_gc_lock);
 384
 385         synchronize_rcu();
 386
 387         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
 388                 xfrm_state_gc_destroy(x);
 389 }
 390
 391 static inline unsigned long make_jiffies(long secs)
 392 {
 393         if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
 394                 return MAX_SCHEDULE_TIMEOUT-1;
 395         else
 396                 return secs*HZ;
 397 }
 398
 399 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
 400 {
 401         struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
 402         struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
 403         unsigned long now = get_seconds();
 404         long next = LONG_MAX;
 405         int warn = 0;
 406         int err = 0;
 407
 408         spin_lock(&x->lock);
 409         if (x->km.state == XFRM_STATE_DEAD)
 410                 goto out;
 411         if (x->km.state == XFRM_STATE_EXPIRED)
 412                 goto expired;
 413         if (x->lft.hard_add_expires_seconds) {
 414                 long tmo = x->lft.hard_add_expires_seconds +
 415                         x->curlft.add_time - now;
 416                 if (tmo <= 0) {
 417                         if (x->xflags & XFRM_SOFT_EXPIRE) {
 418                                 /* enter hard expire without soft expire first?!
 419                                  * setting a new date could trigger this.
 420                                  * workarbound: fix x->curflt.add_time by below:
 421                                  */
 422                                 x->curlft.add_time = now - x->saved_tmo - 1;
 423                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 424                         } else
 425                                 goto expired;
 426                 }
 427                 if (tmo < next)
 428                         next = tmo;
 429         }
 430         if (x->lft.hard_use_expires_seconds) {
 431                 long tmo = x->lft.hard_use_expires_seconds +
 432                         (x->curlft.use_time ? : now) - now;
 433                 if (tmo <= 0)
 434                         goto expired;
 435                 if (tmo < next)
 436                         next = tmo;
 437         }
 438         if (x->km.dying)
 439                 goto resched;
 440         if (x->lft.soft_add_expires_seconds) {
 441                 long tmo = x->lft.soft_add_expires_seconds +
 442                         x->curlft.add_time - now;
 443                 if (tmo <= 0) {
 444                         warn = 1;
 445                         x->xflags &= ~XFRM_SOFT_EXPIRE;
 446                 } else if (tmo < next) {
 447                         next = tmo;
 448                         x->xflags |= XFRM_SOFT_EXPIRE;
 449                         x->saved_tmo = tmo;
 450                 }
 451         }
 452         if (x->lft.soft_use_expires_seconds) {
 453                 long tmo = x->lft.soft_use_expires_seconds +
 454                         (x->curlft.use_time ? : now) - now;
 455                 if (tmo <= 0)
 456                         warn = 1;
 457                 else if (tmo < next)
 458                         next = tmo;
 459         }
 460
 461         x->km.dying = warn;
 462         if (warn)
 463                 km_state_expired(x, 0, 0);
 464 resched:
 465         if (next != LONG_MAX) {
 466                 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
 467         }
 468
 469         goto out;
 470
 471 expired:
 472         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
 473                 x->km.state = XFRM_STATE_EXPIRED;
 474
 475         err = __xfrm_state_delete(x);
 476         if (!err)
 477                 km_state_expired(x, 1, 0);
 478
 479         xfrm_audit_state_delete(x, err ? 0 : 1, true);
 480
 481 out:
 482         spin_unlock(&x->lock);
 483         return HRTIMER_NORESTART;
 484 }
 485
 486 static void xfrm_replay_timer_handler(unsigned long data);
 487
 488 struct xfrm_state *xfrm_state_alloc(struct net *net)
 489 {
 490         struct xfrm_state *x;
 491
 492         x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
 493
 494         if (x) {
 495                 write_pnet(&x->xs_net, net);
 496                 atomic_set(&x->refcnt, 1);
 497                 atomic_set(&x->tunnel_users, 0);
 498                 INIT_LIST_HEAD(&x->km.all);
 499                 INIT_HLIST_NODE(&x->bydst);
 500                 INIT_HLIST_NODE(&x->bysrc);
 501                 INIT_HLIST_NODE(&x->byspi);
 502                 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
 503                                         CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
 504                 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
 505                                 (unsigned long)x);
 506                 x->curlft.add_time = get_seconds();
 507                 x->lft.soft_byte_limit = XFRM_INF;
 508                 x->lft.soft_packet_limit = XFRM_INF;
 509                 x->lft.hard_byte_limit = XFRM_INF;
 510                 x->lft.hard_packet_limit = XFRM_INF;
 511                 x->replay_maxage = 0;
 512                 x->replay_maxdiff = 0;
 513                 x->inner_mode = NULL;
 514                 x->inner_mode_iaf = NULL;
 515                 spin_lock_init(&x->lock);
 516         }
 517         return x;
 518 }
 519 EXPORT_SYMBOL(xfrm_state_alloc);
 520
 521 void __xfrm_state_destroy(struct xfrm_state *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, &xfrm_state_gc_list);
 527         spin_unlock_bh(&xfrm_state_gc_lock);
 528         schedule_work(&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(&net->xfrm.xfrm_state_lock);
 540                 list_del(&x->km.all);
 541                 hlist_del_rcu(&x->bydst);
 542                 hlist_del_rcu(&x->bysrc);
 543                 if (x->id.spi)
 544                         hlist_del_rcu(&x->byspi);
 545                 net->xfrm.state_num--;
 546                 spin_unlock(&net->xfrm.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, bool task_valid)
 575 {
 576         int i, err = 0;
 577
 578         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 579                 struct xfrm_state *x;
 580
 581                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 582                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 583                            (err = security_xfrm_state_delete(x)) != 0) {
 584                                 xfrm_audit_state_delete(x, 0, task_valid);
 585                                 return err;
 586                         }
 587                 }
 588         }
 589
 590         return err;
 591 }
 592 #else
 593 static inline int
 594 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 595 {
 596         return 0;
 597 }
 598 #endif
 599
 600 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
 601 {
 602         int i, err = 0, cnt = 0;
 603
 604         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 605         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
 606         if (err)
 607                 goto out;
 608
 609         err = -ESRCH;
 610         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 611                 struct xfrm_state *x;
 612 restart:
 613                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 614                         if (!xfrm_state_kern(x) &&
 615                             xfrm_id_proto_match(x->id.proto, proto)) {
 616                                 xfrm_state_hold(x);
 617                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 618
 619                                 err = xfrm_state_delete(x);
 620                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 621                                                         task_valid);
 622                                 xfrm_state_put(x);
 623                                 if (!err)
 624                                         cnt++;
 625
 626                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 627                                 goto restart;
 628                         }
 629                 }
 630         }
 631         if (cnt)
 632                 err = 0;
 633
 634 out:
 635         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 636         return err;
 637 }
 638 EXPORT_SYMBOL(xfrm_state_flush);
 639
 640 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 641 {
 642         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 643         si->sadcnt = net->xfrm.state_num;
 644         si->sadhcnt = net->xfrm.state_hmask;
 645         si->sadhmcnt = xfrm_state_hashmax;
 646         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 647 }
 648 EXPORT_SYMBOL(xfrm_sad_getinfo);
 649
 650 static int
 651 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 652                     const struct xfrm_tmpl *tmpl,
 653                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 654                     unsigned short family)
 655 {
 656         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 657         if (!afinfo)
 658                 return -1;
 659         afinfo->init_tempsel(&x->sel, fl);
 660
 661         if (family != tmpl->encap_family) {
 662                 xfrm_state_put_afinfo(afinfo);
 663                 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
 664                 if (!afinfo)
 665                         return -1;
 666         }
 667         afinfo->init_temprop(x, 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, u32 mark,
 673                                               const xfrm_address_t *daddr,
 674                                               __be32 spi, u8 proto,
 675                                               unsigned short family)
 676 {
 677         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 678         struct xfrm_state *x;
 679
 680         hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
 681                 if (x->props.family != family ||
 682                     x->id.spi       != spi ||
 683                     x->id.proto     != proto ||
 684                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
 685                         continue;
 686
 687                 if ((mark & x->mark.m) != x->mark.v)
 688                         continue;
 689                 if (!xfrm_state_hold_rcu(x))
 690                         continue;
 691                 return x;
 692         }
 693
 694         return NULL;
 695 }
 696
 697 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 698                                                      const xfrm_address_t *daddr,
 699                                                      const xfrm_address_t *saddr,
 700                                                      u8 proto, unsigned short family)
 701 {
 702         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 703         struct xfrm_state *x;
 704
 705         hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
 706                 if (x->props.family != family ||
 707                     x->id.proto     != proto ||
 708                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
 709                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
 710                         continue;
 711
 712                 if ((mark & x->mark.m) != x->mark.v)
 713                         continue;
 714                 if (!xfrm_state_hold_rcu(x))
 715                         continue;
 716                 return x;
 717         }
 718
 719         return NULL;
 720 }
 721
 722 static inline struct xfrm_state *
 723 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 724 {
 725         struct net *net = xs_net(x);
 726         u32 mark = x->mark.v & x->mark.m;
 727
 728         if (use_spi)
 729                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
 730                                            x->id.spi, x->id.proto, family);
 731         else
 732                 return __xfrm_state_lookup_byaddr(net, mark,
 733                                                   &x->id.daddr,
 734                                                   &x->props.saddr,
 735                                                   x->id.proto, family);
 736 }
 737
 738 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 739 {
 740         if (have_hash_collision &&
 741             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 742             net->xfrm.state_num > net->xfrm.state_hmask)
 743                 schedule_work(&net->xfrm.state_hash_work);
 744 }
 745
 746 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
 747                                const struct flowi *fl, unsigned short family,
 748                                struct xfrm_state **best, int *acq_in_progress,
 749                                int *error)
 750 {
 751         /* Resolution logic:
 752          * 1. There is a valid state with matching selector. Done.
 753          * 2. Valid state with inappropriate selector. Skip.
 754          *
 755          * Entering area of "sysdeps".
 756          *
 757          * 3. If state is not valid, selector is temporary, it selects
 758          *    only session which triggered previous resolution. Key
 759          *    manager will do something to install a state with proper
 760          *    selector.
 761          */
 762         if (x->km.state == XFRM_STATE_VALID) {
 763                 if ((x->sel.family &&
 764                      !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
 765                     !security_xfrm_state_pol_flow_match(x, pol, fl))
 766                         return;
 767
 768                 if (!*best ||
 769                     (*best)->km.dying > x->km.dying ||
 770                     ((*best)->km.dying == x->km.dying &&
 771                      (*best)->curlft.add_time < x->curlft.add_time))
 772                         *best = x;
 773         } else if (x->km.state == XFRM_STATE_ACQ) {
 774                 *acq_in_progress = 1;
 775         } else if (x->km.state == XFRM_STATE_ERROR ||
 776                    x->km.state == XFRM_STATE_EXPIRED) {
 777                 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
 778                     security_xfrm_state_pol_flow_match(x, pol, fl))
 779                         *error = -ESRCH;
 780         }
 781 }
 782
 783 struct xfrm_state *
 784 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 785                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
 786                 struct xfrm_policy *pol, int *err,
 787                 unsigned short family)
 788 {
 789         static xfrm_address_t saddr_wildcard = { };
 790         struct net *net = xp_net(pol);
 791         unsigned int h, h_wildcard;
 792         struct xfrm_state *x, *x0, *to_put;
 793         int acquire_in_progress = 0;
 794         int error = 0;
 795         struct xfrm_state *best = NULL;
 796         u32 mark = pol->mark.v & pol->mark.m;
 797         unsigned short encap_family = tmpl->encap_family;
 798         unsigned int sequence;
 799         struct km_event c;
 800
 801         to_put = NULL;
 802
 803         sequence = read_seqcount_begin(&xfrm_state_hash_generation);
 804
 805         rcu_read_lock();
 806         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
 807         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
 808                 if (x->props.family == encap_family &&
 809                     x->props.reqid == tmpl->reqid &&
 810                     (mark & x->mark.m) == x->mark.v &&
 811                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 812                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
 813                     tmpl->mode == x->props.mode &&
 814                     tmpl->id.proto == x->id.proto &&
 815                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 816                         xfrm_state_look_at(pol, x, fl, encap_family,
 817                                            &best, &acquire_in_progress, &error);
 818         }
 819         if (best || acquire_in_progress)
 820                 goto found;
 821
 822         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
 823         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
 824                 if (x->props.family == encap_family &&
 825                     x->props.reqid == tmpl->reqid &&
 826                     (mark & x->mark.m) == x->mark.v &&
 827                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 828                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
 829                     tmpl->mode == x->props.mode &&
 830                     tmpl->id.proto == x->id.proto &&
 831                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
 832                         xfrm_state_look_at(pol, x, fl, encap_family,
 833                                            &best, &acquire_in_progress, &error);
 834         }
 835
 836 found:
 837         x = best;
 838         if (!x && !error && !acquire_in_progress) {
 839                 if (tmpl->id.spi &&
 840                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
 841                                               tmpl->id.proto, encap_family)) != NULL) {
 842                         to_put = x0;
 843                         error = -EEXIST;
 844                         goto out;
 845                 }
 846
 847                 c.net = net;
 848                 /* If the KMs have no listeners (yet...), avoid allocating an SA
 849                  * for each and every packet - garbage collection might not
 850                  * handle the flood.
 851                  */
 852                 if (!km_is_alive(&c)) {
 853                         error = -ESRCH;
 854                         goto out;
 855                 }
 856
 857                 x = xfrm_state_alloc(net);
 858                 if (x == NULL) {
 859                         error = -ENOMEM;
 860                         goto out;
 861                 }
 862                 /* Initialize temporary state matching only
 863                  * to current session. */
 864                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
 865                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
 866
 867                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
 868                 if (error) {
 869                         x->km.state = XFRM_STATE_DEAD;
 870                         to_put = x;
 871                         x = NULL;
 872                         goto out;
 873                 }
 874
 875                 if (km_query(x, tmpl, pol) == 0) {
 876                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 877                         x->km.state = XFRM_STATE_ACQ;
 878                         list_add(&x->km.all, &net->xfrm.state_all);
 879                         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
 880                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
 881                         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
 882                         if (x->id.spi) {
 883                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
 884                                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
 885                         }
 886                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
 887                         tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
 888                         net->xfrm.state_num++;
 889                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
 890                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 891                 } else {
 892                         x->km.state = XFRM_STATE_DEAD;
 893                         to_put = x;
 894                         x = NULL;
 895                         error = -ESRCH;
 896                 }
 897         }
 898 out:
 899         if (x) {
 900                 if (!xfrm_state_hold_rcu(x)) {
 901                         *err = -EAGAIN;
 902                         x = NULL;
 903                 }
 904         } else {
 905                 *err = acquire_in_progress ? -EAGAIN : error;
 906         }
 907         rcu_read_unlock();
 908         if (to_put)
 909                 xfrm_state_put(to_put);
 910
 911         if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
 912                 *err = -EAGAIN;
 913                 if (x) {
 914                         xfrm_state_put(x);
 915                         x = NULL;
 916                 }
 917         }
 918
 919         return x;
 920 }
 921
 922 struct xfrm_state *
 923 xfrm_stateonly_find(struct net *net, u32 mark,
 924                     xfrm_address_t *daddr, xfrm_address_t *saddr,
 925                     unsigned short family, u8 mode, u8 proto, u32 reqid)
 926 {
 927         unsigned int h;
 928         struct xfrm_state *rx = NULL, *x = NULL;
 929
 930         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 931         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
 932         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
 933                 if (x->props.family == family &&
 934                     x->props.reqid == reqid &&
 935                     (mark & x->mark.m) == x->mark.v &&
 936                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
 937                     xfrm_state_addr_check(x, daddr, saddr, family) &&
 938                     mode == x->props.mode &&
 939                     proto == x->id.proto &&
 940                     x->km.state == XFRM_STATE_VALID) {
 941                         rx = x;
 942                         break;
 943                 }
 944         }
 945
 946         if (rx)
 947                 xfrm_state_hold(rx);
 948         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 949
 950
 951         return rx;
 952 }
 953 EXPORT_SYMBOL(xfrm_stateonly_find);
 954
 955 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
 956                                               unsigned short family)
 957 {
 958         struct xfrm_state *x;
 959         struct xfrm_state_walk *w;
 960
 961         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 962         list_for_each_entry(w, &net->xfrm.state_all, all) {
 963                 x = container_of(w, struct xfrm_state, km);
 964                 if (x->props.family != family ||
 965                         x->id.spi != spi)
 966                         continue;
 967
 968                 xfrm_state_hold(x);
 969                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 970                 return x;
 971         }
 972         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 973         return NULL;
 974 }
 975 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
 976
 977 static void __xfrm_state_insert(struct xfrm_state *x)
 978 {
 979         struct net *net = xs_net(x);
 980         unsigned int h;
 981
 982         list_add(&x->km.all, &net->xfrm.state_all);
 983
 984         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
 985                           x->props.reqid, x->props.family);
 986         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
 987
 988         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
 989         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
 990
 991         if (x->id.spi) {
 992                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
 993                                   x->props.family);
 994
 995                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
 996         }
 997
 998         tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
 999         if (x->replay_maxage)
1000                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1001
1002         net->xfrm.state_num++;
1003
1004         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1005 }
1006
1007 /* net->xfrm.xfrm_state_lock is held */
1008 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1009 {
1010         struct net *net = xs_net(xnew);
1011         unsigned short family = xnew->props.family;
1012         u32 reqid = xnew->props.reqid;
1013         struct xfrm_state *x;
1014         unsigned int h;
1015         u32 mark = xnew->mark.v & xnew->mark.m;
1016
1017         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1018         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1019                 if (x->props.family     == family &&
1020                     x->props.reqid      == reqid &&
1021                     (mark & x->mark.m) == x->mark.v &&
1022                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1023                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1024                         x->genid++;
1025         }
1026 }
1027
1028 void xfrm_state_insert(struct xfrm_state *x)
1029 {
1030         struct net *net = xs_net(x);
1031
1032         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1033         __xfrm_state_bump_genids(x);
1034         __xfrm_state_insert(x);
1035         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1036 }
1037 EXPORT_SYMBOL(xfrm_state_insert);
1038
1039 /* net->xfrm.xfrm_state_lock is held */
1040 static struct xfrm_state *__find_acq_core(struct net *net,
1041                                           const struct xfrm_mark *m,
1042                                           unsigned short family, u8 mode,
1043                                           u32 reqid, u8 proto,
1044                                           const xfrm_address_t *daddr,
1045                                           const xfrm_address_t *saddr,
1046                                           int create)
1047 {
1048         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1049         struct xfrm_state *x;
1050         u32 mark = m->v & m->m;
1051
1052         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1053                 if (x->props.reqid  != reqid ||
1054                     x->props.mode   != mode ||
1055                     x->props.family != family ||
1056                     x->km.state     != XFRM_STATE_ACQ ||
1057                     x->id.spi       != 0 ||
1058                     x->id.proto     != proto ||
1059                     (mark & x->mark.m) != x->mark.v ||
1060                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1061                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1062                         continue;
1063
1064                 xfrm_state_hold(x);
1065                 return x;
1066         }
1067
1068         if (!create)
1069                 return NULL;
1070
1071         x = xfrm_state_alloc(net);
1072         if (likely(x)) {
1073                 switch (family) {
1074                 case AF_INET:
1075                         x->sel.daddr.a4 = daddr->a4;
1076                         x->sel.saddr.a4 = saddr->a4;
1077                         x->sel.prefixlen_d = 32;
1078                         x->sel.prefixlen_s = 32;
1079                         x->props.saddr.a4 = saddr->a4;
1080                         x->id.daddr.a4 = daddr->a4;
1081                         break;
1082
1083                 case AF_INET6:
1084                         x->sel.daddr.in6 = daddr->in6;
1085                         x->sel.saddr.in6 = saddr->in6;
1086                         x->sel.prefixlen_d = 128;
1087                         x->sel.prefixlen_s = 128;
1088                         x->props.saddr.in6 = saddr->in6;
1089                         x->id.daddr.in6 = daddr->in6;
1090                         break;
1091                 }
1092
1093                 x->km.state = XFRM_STATE_ACQ;
1094                 x->id.proto = proto;
1095                 x->props.family = family;
1096                 x->props.mode = mode;
1097                 x->props.reqid = reqid;
1098                 x->mark.v = m->v;
1099                 x->mark.m = m->m;
1100                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1101                 xfrm_state_hold(x);
1102                 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1103                 list_add(&x->km.all, &net->xfrm.state_all);
1104                 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1105                 h = xfrm_src_hash(net, daddr, saddr, family);
1106                 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1107
1108                 net->xfrm.state_num++;
1109
1110                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1111         }
1112
1113         return x;
1114 }
1115
1116 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1117
1118 int xfrm_state_add(struct xfrm_state *x)
1119 {
1120         struct net *net = xs_net(x);
1121         struct xfrm_state *x1, *to_put;
1122         int family;
1123         int err;
1124         u32 mark = x->mark.v & x->mark.m;
1125         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1126
1127         family = x->props.family;
1128
1129         to_put = NULL;
1130
1131         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1132
1133         x1 = __xfrm_state_locate(x, use_spi, family);
1134         if (x1) {
1135                 to_put = x1;
1136                 x1 = NULL;
1137                 err = -EEXIST;
1138                 goto out;
1139         }
1140
1141         if (use_spi && x->km.seq) {
1142                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1143                 if (x1 && ((x1->id.proto != x->id.proto) ||
1144                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1145                         to_put = x1;
1146                         x1 = NULL;
1147                 }
1148         }
1149
1150         if (use_spi && !x1)
1151                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1152                                      x->props.reqid, x->id.proto,
1153                                      &x->id.daddr, &x->props.saddr, 0);
1154
1155         __xfrm_state_bump_genids(x);
1156         __xfrm_state_insert(x);
1157         err = 0;
1158
1159 out:
1160         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1161
1162         if (x1) {
1163                 xfrm_state_delete(x1);
1164                 xfrm_state_put(x1);
1165         }
1166
1167         if (to_put)
1168                 xfrm_state_put(to_put);
1169
1170         return err;
1171 }
1172 EXPORT_SYMBOL(xfrm_state_add);
1173
1174 #ifdef CONFIG_XFRM_MIGRATE
1175 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
1176 {
1177         struct net *net = xs_net(orig);
1178         struct xfrm_state *x = xfrm_state_alloc(net);
1179         if (!x)
1180                 goto out;
1181
1182         memcpy(&x->id, &orig->id, sizeof(x->id));
1183         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1184         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1185         x->props.mode = orig->props.mode;
1186         x->props.replay_window = orig->props.replay_window;
1187         x->props.reqid = orig->props.reqid;
1188         x->props.family = orig->props.family;
1189         x->props.saddr = orig->props.saddr;
1190
1191         if (orig->aalg) {
1192                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1193                 if (!x->aalg)
1194                         goto error;
1195         }
1196         x->props.aalgo = orig->props.aalgo;
1197
1198         if (orig->aead) {
1199                 x->aead = xfrm_algo_aead_clone(orig->aead);
1200                 if (!x->aead)
1201                         goto error;
1202         }
1203         if (orig->ealg) {
1204                 x->ealg = xfrm_algo_clone(orig->ealg);
1205                 if (!x->ealg)
1206                         goto error;
1207         }
1208         x->props.ealgo = orig->props.ealgo;
1209
1210         if (orig->calg) {
1211                 x->calg = xfrm_algo_clone(orig->calg);
1212                 if (!x->calg)
1213                         goto error;
1214         }
1215         x->props.calgo = orig->props.calgo;
1216
1217         if (orig->encap) {
1218                 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1219                 if (!x->encap)
1220                         goto error;
1221         }
1222
1223         if (orig->coaddr) {
1224                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1225                                     GFP_KERNEL);
1226                 if (!x->coaddr)
1227                         goto error;
1228         }
1229
1230         if (orig->replay_esn) {
1231                 if (xfrm_replay_clone(x, orig))
1232                         goto error;
1233         }
1234
1235         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1236
1237         if (xfrm_init_state(x) < 0)
1238                 goto error;
1239
1240         x->props.flags = orig->props.flags;
1241         x->props.extra_flags = orig->props.extra_flags;
1242
1243         x->tfcpad = orig->tfcpad;
1244         x->replay_maxdiff = orig->replay_maxdiff;
1245         x->replay_maxage = orig->replay_maxage;
1246         x->curlft.add_time = orig->curlft.add_time;
1247         x->km.state = orig->km.state;
1248         x->km.seq = orig->km.seq;
1249
1250         return x;
1251
1252  error:
1253         xfrm_state_put(x);
1254 out:
1255         return NULL;
1256 }
1257
1258 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1259 {
1260         unsigned int h;
1261         struct xfrm_state *x = NULL;
1262
1263         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1264
1265         if (m->reqid) {
1266                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1267                                   m->reqid, m->old_family);
1268                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1269                         if (x->props.mode != m->mode ||
1270                             x->id.proto != m->proto)
1271                                 continue;
1272                         if (m->reqid && x->props.reqid != m->reqid)
1273                                 continue;
1274                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1275                                              m->old_family) ||
1276                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1277                                              m->old_family))
1278                                 continue;
1279                         xfrm_state_hold(x);
1280                         break;
1281                 }
1282         } else {
1283                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1284                                   m->old_family);
1285                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1286                         if (x->props.mode != m->mode ||
1287                             x->id.proto != m->proto)
1288                                 continue;
1289                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1290                                              m->old_family) ||
1291                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1292                                              m->old_family))
1293                                 continue;
1294                         xfrm_state_hold(x);
1295                         break;
1296                 }
1297         }
1298
1299         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1300
1301         return x;
1302 }
1303 EXPORT_SYMBOL(xfrm_migrate_state_find);
1304
1305 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1306                                       struct xfrm_migrate *m)
1307 {
1308         struct xfrm_state *xc;
1309
1310         xc = xfrm_state_clone(x);
1311         if (!xc)
1312                 return NULL;
1313
1314         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1315         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1316
1317         /* add state */
1318         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1319                 /* a care is needed when the destination address of the
1320                    state is to be updated as it is a part of triplet */
1321                 xfrm_state_insert(xc);
1322         } else {
1323                 if (xfrm_state_add(xc) < 0)
1324                         goto error;
1325         }
1326
1327         return xc;
1328 error:
1329         xfrm_state_put(xc);
1330         return NULL;
1331 }
1332 EXPORT_SYMBOL(xfrm_state_migrate);
1333 #endif
1334
1335 int xfrm_state_update(struct xfrm_state *x)
1336 {
1337         struct xfrm_state *x1, *to_put;
1338         int err;
1339         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1340         struct net *net = xs_net(x);
1341
1342         to_put = NULL;
1343
1344         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1345         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1346
1347         err = -ESRCH;
1348         if (!x1)
1349                 goto out;
1350
1351         if (xfrm_state_kern(x1)) {
1352                 to_put = x1;
1353                 err = -EEXIST;
1354                 goto out;
1355         }
1356
1357         if (x1->km.state == XFRM_STATE_ACQ) {
1358                 __xfrm_state_insert(x);
1359                 x = NULL;
1360         }
1361         err = 0;
1362
1363 out:
1364         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1365
1366         if (to_put)
1367                 xfrm_state_put(to_put);
1368
1369         if (err)
1370                 return err;
1371
1372         if (!x) {
1373                 xfrm_state_delete(x1);
1374                 xfrm_state_put(x1);
1375                 return 0;
1376         }
1377
1378         err = -EINVAL;
1379         spin_lock_bh(&x1->lock);
1380         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1381                 if (x->encap && x1->encap)
1382                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1383                 if (x->coaddr && x1->coaddr) {
1384                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1385                 }
1386                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1387                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1388                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1389                 x1->km.dying = 0;
1390
1391                 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1392                 if (x1->curlft.use_time)
1393                         xfrm_state_check_expire(x1);
1394
1395                 err = 0;
1396                 x->km.state = XFRM_STATE_DEAD;
1397                 __xfrm_state_put(x);
1398         }
1399         spin_unlock_bh(&x1->lock);
1400
1401         xfrm_state_put(x1);
1402
1403         return err;
1404 }
1405 EXPORT_SYMBOL(xfrm_state_update);
1406
1407 int xfrm_state_check_expire(struct xfrm_state *x)
1408 {
1409         if (!x->curlft.use_time)
1410                 x->curlft.use_time = get_seconds();
1411
1412         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1413             x->curlft.packets >= x->lft.hard_packet_limit) {
1414                 x->km.state = XFRM_STATE_EXPIRED;
1415                 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1416                 return -EINVAL;
1417         }
1418
1419         if (!x->km.dying &&
1420             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1421              x->curlft.packets >= x->lft.soft_packet_limit)) {
1422                 x->km.dying = 1;
1423                 km_state_expired(x, 0, 0);
1424         }
1425         return 0;
1426 }
1427 EXPORT_SYMBOL(xfrm_state_check_expire);
1428
1429 struct xfrm_state *
1430 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1431                   u8 proto, unsigned short family)
1432 {
1433         struct xfrm_state *x;
1434
1435         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1436         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1437         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1438         return x;
1439 }
1440 EXPORT_SYMBOL(xfrm_state_lookup);
1441
1442 struct xfrm_state *
1443 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1444                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1445                          u8 proto, unsigned short family)
1446 {
1447         struct xfrm_state *x;
1448
1449         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1450         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1451         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1452         return x;
1453 }
1454 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1455
1456 struct xfrm_state *
1457 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1458               u8 proto, const xfrm_address_t *daddr,
1459               const xfrm_address_t *saddr, int create, unsigned short family)
1460 {
1461         struct xfrm_state *x;
1462
1463         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1464         x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1465         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1466
1467         return x;
1468 }
1469 EXPORT_SYMBOL(xfrm_find_acq);
1470
1471 #ifdef CONFIG_XFRM_SUB_POLICY
1472 int
1473 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1474                unsigned short family, struct net *net)
1475 {
1476         int err = 0;
1477         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1478         if (!afinfo)
1479                 return -EAFNOSUPPORT;
1480
1481         spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1482         if (afinfo->tmpl_sort)
1483                 err = afinfo->tmpl_sort(dst, src, n);
1484         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1485         xfrm_state_put_afinfo(afinfo);
1486         return err;
1487 }
1488 EXPORT_SYMBOL(xfrm_tmpl_sort);
1489
1490 int
1491 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1492                 unsigned short family)
1493 {
1494         int err = 0;
1495         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1496         struct net *net = xs_net(*src);
1497
1498         if (!afinfo)
1499                 return -EAFNOSUPPORT;
1500
1501         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1502         if (afinfo->state_sort)
1503                 err = afinfo->state_sort(dst, src, n);
1504         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1505         xfrm_state_put_afinfo(afinfo);
1506         return err;
1507 }
1508 EXPORT_SYMBOL(xfrm_state_sort);
1509 #endif
1510
1511 /* Silly enough, but I'm lazy to build resolution list */
1512
1513 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1514 {
1515         int i;
1516
1517         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1518                 struct xfrm_state *x;
1519
1520                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1521                         if (x->km.seq == seq &&
1522                             (mark & x->mark.m) == x->mark.v &&
1523                             x->km.state == XFRM_STATE_ACQ) {
1524                                 xfrm_state_hold(x);
1525                                 return x;
1526                         }
1527                 }
1528         }
1529         return NULL;
1530 }
1531
1532 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1533 {
1534         struct xfrm_state *x;
1535
1536         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1537         x = __xfrm_find_acq_byseq(net, mark, seq);
1538         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1539         return x;
1540 }
1541 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1542
1543 u32 xfrm_get_acqseq(void)
1544 {
1545         u32 res;
1546         static atomic_t acqseq;
1547
1548         do {
1549                 res = atomic_inc_return(&acqseq);
1550         } while (!res);
1551
1552         return res;
1553 }
1554 EXPORT_SYMBOL(xfrm_get_acqseq);
1555
1556 int verify_spi_info(u8 proto, u32 min, u32 max)
1557 {
1558         switch (proto) {
1559         case IPPROTO_AH:
1560         case IPPROTO_ESP:
1561                 break;
1562
1563         case IPPROTO_COMP:
1564                 /* IPCOMP spi is 16-bits. */
1565                 if (max >= 0x10000)
1566                         return -EINVAL;
1567                 break;
1568
1569         default:
1570                 return -EINVAL;
1571         }
1572
1573         if (min > max)
1574                 return -EINVAL;
1575
1576         return 0;
1577 }
1578 EXPORT_SYMBOL(verify_spi_info);
1579
1580 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1581 {
1582         struct net *net = xs_net(x);
1583         unsigned int h;
1584         struct xfrm_state *x0;
1585         int err = -ENOENT;
1586         __be32 minspi = htonl(low);
1587         __be32 maxspi = htonl(high);
1588         u32 mark = x->mark.v & x->mark.m;
1589
1590         spin_lock_bh(&x->lock);
1591         if (x->km.state == XFRM_STATE_DEAD)
1592                 goto unlock;
1593
1594         err = 0;
1595         if (x->id.spi)
1596                 goto unlock;
1597
1598         err = -ENOENT;
1599
1600         if (minspi == maxspi) {
1601                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1602                 if (x0) {
1603                         xfrm_state_put(x0);
1604                         goto unlock;
1605                 }
1606                 x->id.spi = minspi;
1607         } else {
1608                 u32 spi = 0;
1609                 for (h = 0; h < high-low+1; h++) {
1610                         spi = low + prandom_u32()%(high-low+1);
1611                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1612                         if (x0 == NULL) {
1613                                 x->id.spi = htonl(spi);
1614                                 break;
1615                         }
1616                         xfrm_state_put(x0);
1617                 }
1618         }
1619         if (x->id.spi) {
1620                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1621                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1622                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1623                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1624
1625                 err = 0;
1626         }
1627
1628 unlock:
1629         spin_unlock_bh(&x->lock);
1630
1631         return err;
1632 }
1633 EXPORT_SYMBOL(xfrm_alloc_spi);
1634
1635 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1636                                       struct xfrm_address_filter *filter)
1637 {
1638         if (filter) {
1639                 if ((filter->family == AF_INET ||
1640                      filter->family == AF_INET6) &&
1641                     x->props.family != filter->family)
1642                         return false;
1643
1644                 return addr_match(&x->props.saddr, &filter->saddr,
1645                                   filter->splen) &&
1646                        addr_match(&x->id.daddr, &filter->daddr,
1647                                   filter->dplen);
1648         }
1649         return true;
1650 }
1651
1652 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1653                     int (*func)(struct xfrm_state *, int, void*),
1654                     void *data)
1655 {
1656         struct xfrm_state *state;
1657         struct xfrm_state_walk *x;
1658         int err = 0;
1659
1660         if (walk->seq != 0 && list_empty(&walk->all))
1661                 return 0;
1662
1663         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1664         if (list_empty(&walk->all))
1665                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1666         else
1667                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1668         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1669                 if (x->state == XFRM_STATE_DEAD)
1670                         continue;
1671                 state = container_of(x, struct xfrm_state, km);
1672                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1673                         continue;
1674                 if (!__xfrm_state_filter_match(state, walk->filter))
1675                         continue;
1676                 err = func(state, walk->seq, data);
1677                 if (err) {
1678                         list_move_tail(&walk->all, &x->all);
1679                         goto out;
1680                 }
1681                 walk->seq++;
1682         }
1683         if (walk->seq == 0) {
1684                 err = -ENOENT;
1685                 goto out;
1686         }
1687         list_del_init(&walk->all);
1688 out:
1689         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1690         return err;
1691 }
1692 EXPORT_SYMBOL(xfrm_state_walk);
1693
1694 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1695                           struct xfrm_address_filter *filter)
1696 {
1697         INIT_LIST_HEAD(&walk->all);
1698         walk->proto = proto;
1699         walk->state = XFRM_STATE_DEAD;
1700         walk->seq = 0;
1701         walk->filter = filter;
1702 }
1703 EXPORT_SYMBOL(xfrm_state_walk_init);
1704
1705 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1706 {
1707         kfree(walk->filter);
1708
1709         if (list_empty(&walk->all))
1710                 return;
1711
1712         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1713         list_del(&walk->all);
1714         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1715 }
1716 EXPORT_SYMBOL(xfrm_state_walk_done);
1717
1718 static void xfrm_replay_timer_handler(unsigned long data)
1719 {
1720         struct xfrm_state *x = (struct xfrm_state *)data;
1721
1722         spin_lock(&x->lock);
1723
1724         if (x->km.state == XFRM_STATE_VALID) {
1725                 if (xfrm_aevent_is_on(xs_net(x)))
1726                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1727                 else
1728                         x->xflags |= XFRM_TIME_DEFER;
1729         }
1730
1731         spin_unlock(&x->lock);
1732 }
1733
1734 static LIST_HEAD(xfrm_km_list);
1735
1736 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1737 {
1738         struct xfrm_mgr *km;
1739
1740         rcu_read_lock();
1741         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1742                 if (km->notify_policy)
1743                         km->notify_policy(xp, dir, c);
1744         rcu_read_unlock();
1745 }
1746
1747 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1748 {
1749         struct xfrm_mgr *km;
1750         rcu_read_lock();
1751         list_for_each_entry_rcu(km, &xfrm_km_list, list)
1752                 if (km->notify)
1753                         km->notify(x, c);
1754         rcu_read_unlock();
1755 }
1756
1757 EXPORT_SYMBOL(km_policy_notify);
1758 EXPORT_SYMBOL(km_state_notify);
1759
1760 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1761 {
1762         struct km_event c;
1763
1764         c.data.hard = hard;
1765         c.portid = portid;
1766         c.event = XFRM_MSG_EXPIRE;
1767         km_state_notify(x, &c);
1768 }
1769
1770 EXPORT_SYMBOL(km_state_expired);
1771 /*
1772  * We send to all registered managers regardless of failure
1773  * We are happy with one success
1774 */
1775 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1776 {
1777         int err = -EINVAL, acqret;
1778         struct xfrm_mgr *km;
1779
1780         rcu_read_lock();
1781         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1782                 acqret = km->acquire(x, t, pol);
1783                 if (!acqret)
1784                         err = acqret;
1785         }
1786         rcu_read_unlock();
1787         return err;
1788 }
1789 EXPORT_SYMBOL(km_query);
1790
1791 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1792 {
1793         int err = -EINVAL;
1794         struct xfrm_mgr *km;
1795
1796         rcu_read_lock();
1797         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1798                 if (km->new_mapping)
1799                         err = km->new_mapping(x, ipaddr, sport);
1800                 if (!err)
1801                         break;
1802         }
1803         rcu_read_unlock();
1804         return err;
1805 }
1806 EXPORT_SYMBOL(km_new_mapping);
1807
1808 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1809 {
1810         struct km_event c;
1811
1812         c.data.hard = hard;
1813         c.portid = portid;
1814         c.event = XFRM_MSG_POLEXPIRE;
1815         km_policy_notify(pol, dir, &c);
1816 }
1817 EXPORT_SYMBOL(km_policy_expired);
1818
1819 #ifdef CONFIG_XFRM_MIGRATE
1820 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1821                const struct xfrm_migrate *m, int num_migrate,
1822                const struct xfrm_kmaddress *k)
1823 {
1824         int err = -EINVAL;
1825         int ret;
1826         struct xfrm_mgr *km;
1827
1828         rcu_read_lock();
1829         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1830                 if (km->migrate) {
1831                         ret = km->migrate(sel, dir, type, m, num_migrate, k);
1832                         if (!ret)
1833                                 err = ret;
1834                 }
1835         }
1836         rcu_read_unlock();
1837         return err;
1838 }
1839 EXPORT_SYMBOL(km_migrate);
1840 #endif
1841
1842 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1843 {
1844         int err = -EINVAL;
1845         int ret;
1846         struct xfrm_mgr *km;
1847
1848         rcu_read_lock();
1849         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1850                 if (km->report) {
1851                         ret = km->report(net, proto, sel, addr);
1852                         if (!ret)
1853                                 err = ret;
1854                 }
1855         }
1856         rcu_read_unlock();
1857         return err;
1858 }
1859 EXPORT_SYMBOL(km_report);
1860
1861 bool km_is_alive(const struct km_event *c)
1862 {
1863         struct xfrm_mgr *km;
1864         bool is_alive = false;
1865
1866         rcu_read_lock();
1867         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1868                 if (km->is_alive && km->is_alive(c)) {
1869                         is_alive = true;
1870                         break;
1871                 }
1872         }
1873         rcu_read_unlock();
1874
1875         return is_alive;
1876 }
1877 EXPORT_SYMBOL(km_is_alive);
1878
1879 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1880 {
1881         int err;
1882         u8 *data;
1883         struct xfrm_mgr *km;
1884         struct xfrm_policy *pol = NULL;
1885
1886         if (optlen <= 0 || optlen > PAGE_SIZE)
1887                 return -EMSGSIZE;
1888
1889         data = kmalloc(optlen, GFP_KERNEL);
1890         if (!data)
1891                 return -ENOMEM;
1892
1893         err = -EFAULT;
1894         if (copy_from_user(data, optval, optlen))
1895                 goto out;
1896
1897         err = -EINVAL;
1898         rcu_read_lock();
1899         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1900                 pol = km->compile_policy(sk, optname, data,
1901                                          optlen, &err);
1902                 if (err >= 0)
1903                         break;
1904         }
1905         rcu_read_unlock();
1906
1907         if (err >= 0) {
1908                 xfrm_sk_policy_insert(sk, err, pol);
1909                 xfrm_pol_put(pol);
1910                 err = 0;
1911         }
1912
1913 out:
1914         kfree(data);
1915         return err;
1916 }
1917 EXPORT_SYMBOL(xfrm_user_policy);
1918
1919 static DEFINE_SPINLOCK(xfrm_km_lock);
1920
1921 int xfrm_register_km(struct xfrm_mgr *km)
1922 {
1923         spin_lock_bh(&xfrm_km_lock);
1924         list_add_tail_rcu(&km->list, &xfrm_km_list);
1925         spin_unlock_bh(&xfrm_km_lock);
1926         return 0;
1927 }
1928 EXPORT_SYMBOL(xfrm_register_km);
1929
1930 int xfrm_unregister_km(struct xfrm_mgr *km)
1931 {
1932         spin_lock_bh(&xfrm_km_lock);
1933         list_del_rcu(&km->list);
1934         spin_unlock_bh(&xfrm_km_lock);
1935         synchronize_rcu();
1936         return 0;
1937 }
1938 EXPORT_SYMBOL(xfrm_unregister_km);
1939
1940 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1941 {
1942         int err = 0;
1943         if (unlikely(afinfo == NULL))
1944                 return -EINVAL;
1945         if (unlikely(afinfo->family >= NPROTO))
1946                 return -EAFNOSUPPORT;
1947         spin_lock_bh(&xfrm_state_afinfo_lock);
1948         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1949                 err = -EEXIST;
1950         else
1951                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1952         spin_unlock_bh(&xfrm_state_afinfo_lock);
1953         return err;
1954 }
1955 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1956
1957 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1958 {
1959         int err = 0;
1960         if (unlikely(afinfo == NULL))
1961                 return -EINVAL;
1962         if (unlikely(afinfo->family >= NPROTO))
1963                 return -EAFNOSUPPORT;
1964         spin_lock_bh(&xfrm_state_afinfo_lock);
1965         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1966                 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1967                         err = -EINVAL;
1968                 else
1969                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1970         }
1971         spin_unlock_bh(&xfrm_state_afinfo_lock);
1972         synchronize_rcu();
1973         return err;
1974 }
1975 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1976
1977 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1978 {
1979         struct xfrm_state_afinfo *afinfo;
1980         if (unlikely(family >= NPROTO))
1981                 return NULL;
1982         rcu_read_lock();
1983         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1984         if (unlikely(!afinfo))
1985                 rcu_read_unlock();
1986         return afinfo;
1987 }
1988
1989 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1990 {
1991         rcu_read_unlock();
1992 }
1993
1994 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1995 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1996 {
1997         if (x->tunnel) {
1998                 struct xfrm_state *t = x->tunnel;
1999
2000                 if (atomic_read(&t->tunnel_users) == 2)
2001                         xfrm_state_delete(t);
2002                 atomic_dec(&t->tunnel_users);
2003                 xfrm_state_put(t);
2004                 x->tunnel = NULL;
2005         }
2006 }
2007 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2008
2009 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
2010 {
2011         int res;
2012
2013         spin_lock_bh(&x->lock);
2014         if (x->km.state == XFRM_STATE_VALID &&
2015             x->type && x->type->get_mtu)
2016                 res = x->type->get_mtu(x, mtu);
2017         else
2018                 res = mtu - x->props.header_len;
2019         spin_unlock_bh(&x->lock);
2020         return res;
2021 }
2022
2023 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
2024 {
2025         struct xfrm_state_afinfo *afinfo;
2026         struct xfrm_mode *inner_mode;
2027         int family = x->props.family;
2028         int err;
2029
2030         err = -EAFNOSUPPORT;
2031         afinfo = xfrm_state_get_afinfo(family);
2032         if (!afinfo)
2033                 goto error;
2034
2035         err = 0;
2036         if (afinfo->init_flags)
2037                 err = afinfo->init_flags(x);
2038
2039         xfrm_state_put_afinfo(afinfo);
2040
2041         if (err)
2042                 goto error;
2043
2044         err = -EPROTONOSUPPORT;
2045
2046         if (x->sel.family != AF_UNSPEC) {
2047                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2048                 if (inner_mode == NULL)
2049                         goto error;
2050
2051                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2052                     family != x->sel.family) {
2053                         xfrm_put_mode(inner_mode);
2054                         goto error;
2055                 }
2056
2057                 x->inner_mode = inner_mode;
2058         } else {
2059                 struct xfrm_mode *inner_mode_iaf;
2060                 int iafamily = AF_INET;
2061
2062                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2063                 if (inner_mode == NULL)
2064                         goto error;
2065
2066                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2067                         xfrm_put_mode(inner_mode);
2068                         goto error;
2069                 }
2070                 x->inner_mode = inner_mode;
2071
2072                 if (x->props.family == AF_INET)
2073                         iafamily = AF_INET6;
2074
2075                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2076                 if (inner_mode_iaf) {
2077                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2078                                 x->inner_mode_iaf = inner_mode_iaf;
2079                         else
2080                                 xfrm_put_mode(inner_mode_iaf);
2081                 }
2082         }
2083
2084         x->type = xfrm_get_type(x->id.proto, family);
2085         if (x->type == NULL)
2086                 goto error;
2087
2088         err = x->type->init_state(x);
2089         if (err)
2090                 goto error;
2091
2092         x->outer_mode = xfrm_get_mode(x->props.mode, family);
2093         if (x->outer_mode == NULL) {
2094                 err = -EPROTONOSUPPORT;
2095                 goto error;
2096         }
2097
2098         if (init_replay) {
2099                 err = xfrm_init_replay(x);
2100                 if (err)
2101                         goto error;
2102         }
2103
2104         x->km.state = XFRM_STATE_VALID;
2105
2106 error:
2107         return err;
2108 }
2109
2110 EXPORT_SYMBOL(__xfrm_init_state);
2111
2112 int xfrm_init_state(struct xfrm_state *x)
2113 {
2114         return __xfrm_init_state(x, true);
2115 }
2116
2117 EXPORT_SYMBOL(xfrm_init_state);
2118
2119 int __net_init xfrm_state_init(struct net *net)
2120 {
2121         unsigned int sz;
2122
2123         INIT_LIST_HEAD(&net->xfrm.state_all);
2124
2125         sz = sizeof(struct hlist_head) * 8;
2126
2127         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2128         if (!net->xfrm.state_bydst)
2129                 goto out_bydst;
2130         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2131         if (!net->xfrm.state_bysrc)
2132                 goto out_bysrc;
2133         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2134         if (!net->xfrm.state_byspi)
2135                 goto out_byspi;
2136         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2137
2138         net->xfrm.state_num = 0;
2139         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2140         spin_lock_init(&net->xfrm.xfrm_state_lock);
2141         return 0;
2142
2143 out_byspi:
2144         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2145 out_bysrc:
2146         xfrm_hash_free(net->xfrm.state_bydst, sz);
2147 out_bydst:
2148         return -ENOMEM;
2149 }
2150
2151 void xfrm_state_fini(struct net *net)
2152 {
2153         unsigned int sz;
2154
2155         flush_work(&net->xfrm.state_hash_work);
2156         xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2157         flush_work(&xfrm_state_gc_work);
2158
2159         WARN_ON(!list_empty(&net->xfrm.state_all));
2160
2161         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2162         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2163         xfrm_hash_free(net->xfrm.state_byspi, sz);
2164         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2165         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2166         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2167         xfrm_hash_free(net->xfrm.state_bydst, sz);
2168 }
2169
2170 #ifdef CONFIG_AUDITSYSCALL
2171 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2172                                      struct audit_buffer *audit_buf)
2173 {
2174         struct xfrm_sec_ctx *ctx = x->security;
2175         u32 spi = ntohl(x->id.spi);
2176
2177         if (ctx)
2178                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2179                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2180
2181         switch (x->props.family) {
2182         case AF_INET:
2183                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2184                                  &x->props.saddr.a4, &x->id.daddr.a4);
2185                 break;
2186         case AF_INET6:
2187                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2188                                  x->props.saddr.a6, x->id.daddr.a6);
2189                 break;
2190         }
2191
2192         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2193 }
2194
2195 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2196                                       struct audit_buffer *audit_buf)
2197 {
2198         const struct iphdr *iph4;
2199         const struct ipv6hdr *iph6;
2200
2201         switch (family) {
2202         case AF_INET:
2203                 iph4 = ip_hdr(skb);
2204                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2205                                  &iph4->saddr, &iph4->daddr);
2206                 break;
2207         case AF_INET6:
2208                 iph6 = ipv6_hdr(skb);
2209                 audit_log_format(audit_buf,
2210                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2211                                  &iph6->saddr, &iph6->daddr,
2212                                  iph6->flow_lbl[0] & 0x0f,
2213                                  iph6->flow_lbl[1],
2214                                  iph6->flow_lbl[2]);
2215                 break;
2216         }
2217 }
2218
2219 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2220 {
2221         struct audit_buffer *audit_buf;
2222
2223         audit_buf = xfrm_audit_start("SAD-add");
2224         if (audit_buf == NULL)
2225                 return;
2226         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2227         xfrm_audit_helper_sainfo(x, audit_buf);
2228         audit_log_format(audit_buf, " res=%u", result);
2229         audit_log_end(audit_buf);
2230 }
2231 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2232
2233 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2234 {
2235         struct audit_buffer *audit_buf;
2236
2237         audit_buf = xfrm_audit_start("SAD-delete");
2238         if (audit_buf == NULL)
2239                 return;
2240         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2241         xfrm_audit_helper_sainfo(x, audit_buf);
2242         audit_log_format(audit_buf, " res=%u", result);
2243         audit_log_end(audit_buf);
2244 }
2245 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2246
2247 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2248                                       struct sk_buff *skb)
2249 {
2250         struct audit_buffer *audit_buf;
2251         u32 spi;
2252
2253         audit_buf = xfrm_audit_start("SA-replay-overflow");
2254         if (audit_buf == NULL)
2255                 return;
2256         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2257         /* don't record the sequence number because it's inherent in this kind
2258          * of audit message */
2259         spi = ntohl(x->id.spi);
2260         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2261         audit_log_end(audit_buf);
2262 }
2263 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2264
2265 void xfrm_audit_state_replay(struct xfrm_state *x,
2266                              struct sk_buff *skb, __be32 net_seq)
2267 {
2268         struct audit_buffer *audit_buf;
2269         u32 spi;
2270
2271         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2272         if (audit_buf == NULL)
2273                 return;
2274         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2275         spi = ntohl(x->id.spi);
2276         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2277                          spi, spi, ntohl(net_seq));
2278         audit_log_end(audit_buf);
2279 }
2280 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2281
2282 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2283 {
2284         struct audit_buffer *audit_buf;
2285
2286         audit_buf = xfrm_audit_start("SA-notfound");
2287         if (audit_buf == NULL)
2288                 return;
2289         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2290         audit_log_end(audit_buf);
2291 }
2292 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2293
2294 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2295                                __be32 net_spi, __be32 net_seq)
2296 {
2297         struct audit_buffer *audit_buf;
2298         u32 spi;
2299
2300         audit_buf = xfrm_audit_start("SA-notfound");
2301         if (audit_buf == NULL)
2302                 return;
2303         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2304         spi = ntohl(net_spi);
2305         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2306                          spi, spi, ntohl(net_seq));
2307         audit_log_end(audit_buf);
2308 }
2309 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2310
2311 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2312                               struct sk_buff *skb, u8 proto)
2313 {
2314         struct audit_buffer *audit_buf;
2315         __be32 net_spi;
2316         __be32 net_seq;
2317
2318         audit_buf = xfrm_audit_start("SA-icv-failure");
2319         if (audit_buf == NULL)
2320                 return;
2321         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2322         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2323                 u32 spi = ntohl(net_spi);
2324                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2325                                  spi, spi, ntohl(net_seq));
2326         }
2327         audit_log_end(audit_buf);
2328 }
2329 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2330 #endif /* CONFIG_AUDITSYSCALL */