net/xfrm/xfrm_state.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * xfrm_state.c
   4  *
   5  * Changes:
   6  *      Mitsuru KANDA @USAGI
   7  *      Kazunori MIYAZAWA @USAGI
   8  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   9  *              IPv6 support
  10  *      YOSHIFUJI Hideaki @USAGI
  11  *              Split up af-specific functions
  12  *      Derek Atkins <derek@ihtfp.com>
  13  *              Add UDP Encapsulation
  14  *
  15  */
  16
  17 #include <linux/workqueue.h>
  18 #include <net/xfrm.h>
  19 #include <linux/pfkeyv2.h>
  20 #include <linux/ipsec.h>
  21 #include <linux/module.h>
  22 #include <linux/cache.h>
  23 #include <linux/audit.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/ktime.h>
  26 #include <linux/slab.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/kernel.h>
  29
  30 #include <crypto/aead.h>
  31
  32 #include "xfrm_hash.h"
  33
  34 #define xfrm_state_deref_prot(table, net) \
  35         rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
  36
  37 static void xfrm_state_gc_task(struct work_struct *work);
  38
  39 /* Each xfrm_state may be linked to two tables:
  40
  41    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
  42    2. Hash table by (daddr,family,reqid) to find what SAs exist for given
  43       destination/tunnel endpoint. (output)
  44  */
  45
  46 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
  47 static struct kmem_cache *xfrm_state_cache __ro_after_init;
  48
  49 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
  50 static HLIST_HEAD(xfrm_state_gc_list);
  51
  52 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
  53 {
  54         return refcount_inc_not_zero(&x->refcnt);
  55 }
  56
  57 static inline unsigned int xfrm_dst_hash(struct net *net,
  58                                          const xfrm_address_t *daddr,
  59                                          const xfrm_address_t *saddr,
  60                                          u32 reqid,
  61                                          unsigned short family)
  62 {
  63         return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
  64 }
  65
  66 static inline unsigned int xfrm_src_hash(struct net *net,
  67                                          const xfrm_address_t *daddr,
  68                                          const xfrm_address_t *saddr,
  69                                          unsigned short family)
  70 {
  71         return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
  72 }
  73
  74 static inline unsigned int
  75 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
  76               __be32 spi, u8 proto, unsigned short family)
  77 {
  78         return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
  79 }
  80
  81 static void xfrm_hash_transfer(struct hlist_head *list,
  82                                struct hlist_head *ndsttable,
  83                                struct hlist_head *nsrctable,
  84                                struct hlist_head *nspitable,
  85                                unsigned int nhashmask)
  86 {
  87         struct hlist_node *tmp;
  88         struct xfrm_state *x;
  89
  90         hlist_for_each_entry_safe(x, tmp, list, bydst) {
  91                 unsigned int h;
  92
  93                 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
  94                                     x->props.reqid, x->props.family,
  95                                     nhashmask);
  96                 hlist_add_head_rcu(&x->bydst, ndsttable + h);
  97
  98                 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
  99                                     x->props.family,
 100                                     nhashmask);
 101                 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
 102
 103                 if (x->id.spi) {
 104                         h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
 105                                             x->id.proto, x->props.family,
 106                                             nhashmask);
 107                         hlist_add_head_rcu(&x->byspi, nspitable + h);
 108                 }
 109         }
 110 }
 111
 112 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
 113 {
 114         return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
 115 }
 116
 117 static void xfrm_hash_resize(struct work_struct *work)
 118 {
 119         struct net *net = container_of(work, struct net, xfrm.state_hash_work);
 120         struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
 121         unsigned long nsize, osize;
 122         unsigned int nhashmask, ohashmask;
 123         int i;
 124
 125         nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
 126         ndst = xfrm_hash_alloc(nsize);
 127         if (!ndst)
 128                 return;
 129         nsrc = xfrm_hash_alloc(nsize);
 130         if (!nsrc) {
 131                 xfrm_hash_free(ndst, nsize);
 132                 return;
 133         }
 134         nspi = xfrm_hash_alloc(nsize);
 135         if (!nspi) {
 136                 xfrm_hash_free(ndst, nsize);
 137                 xfrm_hash_free(nsrc, nsize);
 138                 return;
 139         }
 140
 141         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 142         write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
 143
 144         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
 145         odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
 146         for (i = net->xfrm.state_hmask; i >= 0; i--)
 147                 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
 148
 149         osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
 150         ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
 151         ohashmask = net->xfrm.state_hmask;
 152
 153         rcu_assign_pointer(net->xfrm.state_bydst, ndst);
 154         rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
 155         rcu_assign_pointer(net->xfrm.state_byspi, nspi);
 156         net->xfrm.state_hmask = nhashmask;
 157
 158         write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
 159         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 160
 161         osize = (ohashmask + 1) * sizeof(struct hlist_head);
 162
 163         synchronize_rcu();
 164
 165         xfrm_hash_free(odst, osize);
 166         xfrm_hash_free(osrc, osize);
 167         xfrm_hash_free(ospi, osize);
 168 }
 169
 170 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
 171 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
 172
 173 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 174
 175 int __xfrm_state_delete(struct xfrm_state *x);
 176
 177 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 178 static bool km_is_alive(const struct km_event *c);
 179 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 180
 181 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 182 {
 183         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 184         int err = 0;
 185
 186         if (!afinfo)
 187                 return -EAFNOSUPPORT;
 188
 189 #define X(afi, T, name) do {                    \
 190                 WARN_ON((afi)->type_ ## name);  \
 191                 (afi)->type_ ## name = (T);     \
 192         } while (0)
 193
 194         switch (type->proto) {
 195         case IPPROTO_COMP:
 196                 X(afinfo, type, comp);
 197                 break;
 198         case IPPROTO_AH:
 199                 X(afinfo, type, ah);
 200                 break;
 201         case IPPROTO_ESP:
 202                 X(afinfo, type, esp);
 203                 break;
 204         case IPPROTO_IPIP:
 205                 X(afinfo, type, ipip);
 206                 break;
 207         case IPPROTO_DSTOPTS:
 208                 X(afinfo, type, dstopts);
 209                 break;
 210         case IPPROTO_ROUTING:
 211                 X(afinfo, type, routing);
 212                 break;
 213         case IPPROTO_IPV6:
 214                 X(afinfo, type, ipip6);
 215                 break;
 216         default:
 217                 WARN_ON(1);
 218                 err = -EPROTONOSUPPORT;
 219                 break;
 220         }
 221 #undef X
 222         rcu_read_unlock();
 223         return err;
 224 }
 225 EXPORT_SYMBOL(xfrm_register_type);
 226
 227 void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 228 {
 229         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 230
 231         if (unlikely(afinfo == NULL))
 232                 return;
 233
 234 #define X(afi, T, name) do {                            \
 235                 WARN_ON((afi)->type_ ## name != (T));   \
 236                 (afi)->type_ ## name = NULL;            \
 237         } while (0)
 238
 239         switch (type->proto) {
 240         case IPPROTO_COMP:
 241                 X(afinfo, type, comp);
 242                 break;
 243         case IPPROTO_AH:
 244                 X(afinfo, type, ah);
 245                 break;
 246         case IPPROTO_ESP:
 247                 X(afinfo, type, esp);
 248                 break;
 249         case IPPROTO_IPIP:
 250                 X(afinfo, type, ipip);
 251                 break;
 252         case IPPROTO_DSTOPTS:
 253                 X(afinfo, type, dstopts);
 254                 break;
 255         case IPPROTO_ROUTING:
 256                 X(afinfo, type, routing);
 257                 break;
 258         case IPPROTO_IPV6:
 259                 X(afinfo, type, ipip6);
 260                 break;
 261         default:
 262                 WARN_ON(1);
 263                 break;
 264         }
 265 #undef X
 266         rcu_read_unlock();
 267 }
 268 EXPORT_SYMBOL(xfrm_unregister_type);
 269
 270 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
 271 {
 272         const struct xfrm_type *type = NULL;
 273         struct xfrm_state_afinfo *afinfo;
 274         int modload_attempted = 0;
 275
 276 retry:
 277         afinfo = xfrm_state_get_afinfo(family);
 278         if (unlikely(afinfo == NULL))
 279                 return NULL;
 280
 281         switch (proto) {
 282         case IPPROTO_COMP:
 283                 type = afinfo->type_comp;
 284                 break;
 285         case IPPROTO_AH:
 286                 type = afinfo->type_ah;
 287                 break;
 288         case IPPROTO_ESP:
 289                 type = afinfo->type_esp;
 290                 break;
 291         case IPPROTO_IPIP:
 292                 type = afinfo->type_ipip;
 293                 break;
 294         case IPPROTO_DSTOPTS:
 295                 type = afinfo->type_dstopts;
 296                 break;
 297         case IPPROTO_ROUTING:
 298                 type = afinfo->type_routing;
 299                 break;
 300         case IPPROTO_IPV6:
 301                 type = afinfo->type_ipip6;
 302                 break;
 303         default:
 304                 break;
 305         }
 306
 307         if (unlikely(type && !try_module_get(type->owner)))
 308                 type = NULL;
 309
 310         rcu_read_unlock();
 311
 312         if (!type && !modload_attempted) {
 313                 request_module("xfrm-type-%d-%d", family, proto);
 314                 modload_attempted = 1;
 315                 goto retry;
 316         }
 317
 318         return type;
 319 }
 320
 321 static void xfrm_put_type(const struct xfrm_type *type)
 322 {
 323         module_put(type->owner);
 324 }
 325
 326 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
 327                                unsigned short family)
 328 {
 329         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 330         int err = 0;
 331
 332         if (unlikely(afinfo == NULL))
 333                 return -EAFNOSUPPORT;
 334
 335         switch (type->proto) {
 336         case IPPROTO_ESP:
 337                 WARN_ON(afinfo->type_offload_esp);
 338                 afinfo->type_offload_esp = type;
 339                 break;
 340         default:
 341                 WARN_ON(1);
 342                 err = -EPROTONOSUPPORT;
 343                 break;
 344         }
 345
 346         rcu_read_unlock();
 347         return err;
 348 }
 349 EXPORT_SYMBOL(xfrm_register_type_offload);
 350
 351 void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
 352                                   unsigned short family)
 353 {
 354         struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 355
 356         if (unlikely(afinfo == NULL))
 357                 return;
 358
 359         switch (type->proto) {
 360         case IPPROTO_ESP:
 361                 WARN_ON(afinfo->type_offload_esp != type);
 362                 afinfo->type_offload_esp = NULL;
 363                 break;
 364         default:
 365                 WARN_ON(1);
 366                 break;
 367         }
 368         rcu_read_unlock();
 369 }
 370 EXPORT_SYMBOL(xfrm_unregister_type_offload);
 371
 372 static const struct xfrm_type_offload *
 373 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
 374 {
 375         const struct xfrm_type_offload *type = NULL;
 376         struct xfrm_state_afinfo *afinfo;
 377
 378 retry:
 379         afinfo = xfrm_state_get_afinfo(family);
 380         if (unlikely(afinfo == NULL))
 381                 return NULL;
 382
 383         switch (proto) {
 384         case IPPROTO_ESP:
 385                 type = afinfo->type_offload_esp;
 386                 break;
 387         default:
 388                 break;
 389         }
 390
 391         if ((type && !try_module_get(type->owner)))
 392                 type = NULL;
 393
 394         rcu_read_unlock();
 395
 396         if (!type && try_load) {
 397                 request_module("xfrm-offload-%d-%d", family, proto);
 398                 try_load = false;
 399                 goto retry;
 400         }
 401
 402         return type;
 403 }
 404
 405 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
 406 {
 407         module_put(type->owner);
 408 }
 409
 410 static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
 411         [XFRM_MODE_BEET] = {
 412                 .encap = XFRM_MODE_BEET,
 413                 .flags = XFRM_MODE_FLAG_TUNNEL,
 414                 .family = AF_INET,
 415         },
 416         [XFRM_MODE_TRANSPORT] = {
 417                 .encap = XFRM_MODE_TRANSPORT,
 418                 .family = AF_INET,
 419         },
 420         [XFRM_MODE_TUNNEL] = {
 421                 .encap = XFRM_MODE_TUNNEL,
 422                 .flags = XFRM_MODE_FLAG_TUNNEL,
 423                 .family = AF_INET,
 424         },
 425 };
 426
 427 static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
 428         [XFRM_MODE_BEET] = {
 429                 .encap = XFRM_MODE_BEET,
 430                 .flags = XFRM_MODE_FLAG_TUNNEL,
 431                 .family = AF_INET6,
 432         },
 433         [XFRM_MODE_ROUTEOPTIMIZATION] = {
 434                 .encap = XFRM_MODE_ROUTEOPTIMIZATION,
 435                 .family = AF_INET6,
 436         },
 437         [XFRM_MODE_TRANSPORT] = {
 438                 .encap = XFRM_MODE_TRANSPORT,
 439                 .family = AF_INET6,
 440         },
 441         [XFRM_MODE_TUNNEL] = {
 442                 .encap = XFRM_MODE_TUNNEL,
 443                 .flags = XFRM_MODE_FLAG_TUNNEL,
 444                 .family = AF_INET6,
 445         },
 446 };
 447
 448 static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
 449 {
 450         const struct xfrm_mode *mode;
 451
 452         if (unlikely(encap >= XFRM_MODE_MAX))
 453                 return NULL;
 454
 455         switch (family) {
 456         case AF_INET:
 457                 mode = &xfrm4_mode_map[encap];
 458                 if (mode->family == family)
 459                         return mode;
 460                 break;
 461         case AF_INET6:
 462                 mode = &xfrm6_mode_map[encap];
 463                 if (mode->family == family)
 464                         return mode;
 465                 break;
 466         default:
 467                 break;
 468         }
 469
 470         return NULL;
 471 }
 472
 473 void xfrm_state_free(struct xfrm_state *x)
 474 {
 475         kmem_cache_free(xfrm_state_cache, x);
 476 }
 477 EXPORT_SYMBOL(xfrm_state_free);
 478
 479 static void ___xfrm_state_destroy(struct xfrm_state *x)
 480 {
 481         hrtimer_cancel(&x->mtimer);
 482         del_timer_sync(&x->rtimer);
 483         kfree(x->aead);
 484         kfree(x->aalg);
 485         kfree(x->ealg);
 486         kfree(x->calg);
 487         kfree(x->encap);
 488         kfree(x->coaddr);
 489         kfree(x->replay_esn);
 490         kfree(x->preplay_esn);
 491         if (x->type_offload)
 492                 xfrm_put_type_offload(x->type_offload);
 493         if (x->type) {
 494                 x->type->destructor(x);
 495                 xfrm_put_type(x->type);
 496         }
 497         if (x->xfrag.page)
 498                 put_page(x->xfrag.page);
 499         xfrm_dev_state_free(x);
 500         security_xfrm_state_free(x);
 501         xfrm_state_free(x);
 502 }
 503
 504 static void xfrm_state_gc_task(struct work_struct *work)
 505 {
 506         struct xfrm_state *x;
 507         struct hlist_node *tmp;
 508         struct hlist_head gc_list;
 509
 510         spin_lock_bh(&xfrm_state_gc_lock);
 511         hlist_move_list(&xfrm_state_gc_list, &gc_list);
 512         spin_unlock_bh(&xfrm_state_gc_lock);
 513
 514         synchronize_rcu();
 515
 516         hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
 517                 ___xfrm_state_destroy(x);
 518 }
 519
 520 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
 521 {
 522         struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
 523         enum hrtimer_restart ret = HRTIMER_NORESTART;
 524         time64_t now = ktime_get_real_seconds();
 525         time64_t next = TIME64_MAX;
 526         int warn = 0;
 527         int err = 0;
 528
 529         spin_lock(&x->lock);
 530         if (x->km.state == XFRM_STATE_DEAD)
 531                 goto out;
 532         if (x->km.state == XFRM_STATE_EXPIRED)
 533                 goto expired;
 534         if (x->lft.hard_add_expires_seconds) {
 535                 long tmo = x->lft.hard_add_expires_seconds +
 536                         x->curlft.add_time - now;
 537                 if (tmo <= 0) {
 538                         if (x->xflags & XFRM_SOFT_EXPIRE) {
 539                                 /* enter hard expire without soft expire first?!
 540                                  * setting a new date could trigger this.
 541                                  * workaround: fix x->curflt.add_time by below:
 542                                  */
 543                                 x->curlft.add_time = now - x->saved_tmo - 1;
 544                                 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
 545                         } else
 546                                 goto expired;
 547                 }
 548                 if (tmo < next)
 549                         next = tmo;
 550         }
 551         if (x->lft.hard_use_expires_seconds) {
 552                 long tmo = x->lft.hard_use_expires_seconds +
 553                         (x->curlft.use_time ? : now) - now;
 554                 if (tmo <= 0)
 555                         goto expired;
 556                 if (tmo < next)
 557                         next = tmo;
 558         }
 559         if (x->km.dying)
 560                 goto resched;
 561         if (x->lft.soft_add_expires_seconds) {
 562                 long tmo = x->lft.soft_add_expires_seconds +
 563                         x->curlft.add_time - now;
 564                 if (tmo <= 0) {
 565                         warn = 1;
 566                         x->xflags &= ~XFRM_SOFT_EXPIRE;
 567                 } else if (tmo < next) {
 568                         next = tmo;
 569                         x->xflags |= XFRM_SOFT_EXPIRE;
 570                         x->saved_tmo = tmo;
 571                 }
 572         }
 573         if (x->lft.soft_use_expires_seconds) {
 574                 long tmo = x->lft.soft_use_expires_seconds +
 575                         (x->curlft.use_time ? : now) - now;
 576                 if (tmo <= 0)
 577                         warn = 1;
 578                 else if (tmo < next)
 579                         next = tmo;
 580         }
 581
 582         x->km.dying = warn;
 583         if (warn)
 584                 km_state_expired(x, 0, 0);
 585 resched:
 586         if (next != TIME64_MAX) {
 587                 hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
 588                 ret = HRTIMER_RESTART;
 589         }
 590
 591         goto out;
 592
 593 expired:
 594         if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
 595                 x->km.state = XFRM_STATE_EXPIRED;
 596
 597         err = __xfrm_state_delete(x);
 598         if (!err)
 599                 km_state_expired(x, 1, 0);
 600
 601         xfrm_audit_state_delete(x, err ? 0 : 1, true);
 602
 603 out:
 604         spin_unlock(&x->lock);
 605         return ret;
 606 }
 607
 608 static void xfrm_replay_timer_handler(struct timer_list *t);
 609
 610 struct xfrm_state *xfrm_state_alloc(struct net *net)
 611 {
 612         struct xfrm_state *x;
 613
 614         x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
 615
 616         if (x) {
 617                 write_pnet(&x->xs_net, net);
 618                 refcount_set(&x->refcnt, 1);
 619                 atomic_set(&x->tunnel_users, 0);
 620                 INIT_LIST_HEAD(&x->km.all);
 621                 INIT_HLIST_NODE(&x->bydst);
 622                 INIT_HLIST_NODE(&x->bysrc);
 623                 INIT_HLIST_NODE(&x->byspi);
 624                 hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
 625                 x->mtimer.function = xfrm_timer_handler;
 626                 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
 627                 x->curlft.add_time = ktime_get_real_seconds();
 628                 x->lft.soft_byte_limit = XFRM_INF;
 629                 x->lft.soft_packet_limit = XFRM_INF;
 630                 x->lft.hard_byte_limit = XFRM_INF;
 631                 x->lft.hard_packet_limit = XFRM_INF;
 632                 x->replay_maxage = 0;
 633                 x->replay_maxdiff = 0;
 634                 spin_lock_init(&x->lock);
 635         }
 636         return x;
 637 }
 638 EXPORT_SYMBOL(xfrm_state_alloc);
 639
 640 void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
 641 {
 642         WARN_ON(x->km.state != XFRM_STATE_DEAD);
 643
 644         if (sync) {
 645                 synchronize_rcu();
 646                 ___xfrm_state_destroy(x);
 647         } else {
 648                 spin_lock_bh(&xfrm_state_gc_lock);
 649                 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
 650                 spin_unlock_bh(&xfrm_state_gc_lock);
 651                 schedule_work(&xfrm_state_gc_work);
 652         }
 653 }
 654 EXPORT_SYMBOL(__xfrm_state_destroy);
 655
 656 int __xfrm_state_delete(struct xfrm_state *x)
 657 {
 658         struct net *net = xs_net(x);
 659         int err = -ESRCH;
 660
 661         if (x->km.state != XFRM_STATE_DEAD) {
 662                 x->km.state = XFRM_STATE_DEAD;
 663                 spin_lock(&net->xfrm.xfrm_state_lock);
 664                 list_del(&x->km.all);
 665                 hlist_del_rcu(&x->bydst);
 666                 hlist_del_rcu(&x->bysrc);
 667                 if (x->id.spi)
 668                         hlist_del_rcu(&x->byspi);
 669                 net->xfrm.state_num--;
 670                 spin_unlock(&net->xfrm.xfrm_state_lock);
 671
 672                 if (x->encap_sk)
 673                         sock_put(rcu_dereference_raw(x->encap_sk));
 674
 675                 xfrm_dev_state_delete(x);
 676
 677                 /* All xfrm_state objects are created by xfrm_state_alloc.
 678                  * The xfrm_state_alloc call gives a reference, and that
 679                  * is what we are dropping here.
 680                  */
 681                 xfrm_state_put(x);
 682                 err = 0;
 683         }
 684
 685         return err;
 686 }
 687 EXPORT_SYMBOL(__xfrm_state_delete);
 688
 689 int xfrm_state_delete(struct xfrm_state *x)
 690 {
 691         int err;
 692
 693         spin_lock_bh(&x->lock);
 694         err = __xfrm_state_delete(x);
 695         spin_unlock_bh(&x->lock);
 696
 697         return err;
 698 }
 699 EXPORT_SYMBOL(xfrm_state_delete);
 700
 701 #ifdef CONFIG_SECURITY_NETWORK_XFRM
 702 static inline int
 703 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 704 {
 705         int i, err = 0;
 706
 707         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 708                 struct xfrm_state *x;
 709
 710                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 711                         if (xfrm_id_proto_match(x->id.proto, proto) &&
 712                            (err = security_xfrm_state_delete(x)) != 0) {
 713                                 xfrm_audit_state_delete(x, 0, task_valid);
 714                                 return err;
 715                         }
 716                 }
 717         }
 718
 719         return err;
 720 }
 721
 722 static inline int
 723 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 724 {
 725         int i, err = 0;
 726
 727         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 728                 struct xfrm_state *x;
 729                 struct xfrm_state_offload *xso;
 730
 731                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 732                         xso = &x->xso;
 733
 734                         if (xso->dev == dev &&
 735                            (err = security_xfrm_state_delete(x)) != 0) {
 736                                 xfrm_audit_state_delete(x, 0, task_valid);
 737                                 return err;
 738                         }
 739                 }
 740         }
 741
 742         return err;
 743 }
 744 #else
 745 static inline int
 746 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
 747 {
 748         return 0;
 749 }
 750
 751 static inline int
 752 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
 753 {
 754         return 0;
 755 }
 756 #endif
 757
 758 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
 759 {
 760         int i, err = 0, cnt = 0;
 761
 762         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 763         err = xfrm_state_flush_secctx_check(net, proto, task_valid);
 764         if (err)
 765                 goto out;
 766
 767         err = -ESRCH;
 768         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 769                 struct xfrm_state *x;
 770 restart:
 771                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 772                         if (!xfrm_state_kern(x) &&
 773                             xfrm_id_proto_match(x->id.proto, proto)) {
 774                                 xfrm_state_hold(x);
 775                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 776
 777                                 err = xfrm_state_delete(x);
 778                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 779                                                         task_valid);
 780                                 if (sync)
 781                                         xfrm_state_put_sync(x);
 782                                 else
 783                                         xfrm_state_put(x);
 784                                 if (!err)
 785                                         cnt++;
 786
 787                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 788                                 goto restart;
 789                         }
 790                 }
 791         }
 792 out:
 793         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 794         if (cnt)
 795                 err = 0;
 796
 797         return err;
 798 }
 799 EXPORT_SYMBOL(xfrm_state_flush);
 800
 801 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
 802 {
 803         int i, err = 0, cnt = 0;
 804
 805         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 806         err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
 807         if (err)
 808                 goto out;
 809
 810         err = -ESRCH;
 811         for (i = 0; i <= net->xfrm.state_hmask; i++) {
 812                 struct xfrm_state *x;
 813                 struct xfrm_state_offload *xso;
 814 restart:
 815                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
 816                         xso = &x->xso;
 817
 818                         if (!xfrm_state_kern(x) && xso->dev == dev) {
 819                                 xfrm_state_hold(x);
 820                                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 821
 822                                 err = xfrm_state_delete(x);
 823                                 xfrm_audit_state_delete(x, err ? 0 : 1,
 824                                                         task_valid);
 825                                 xfrm_state_put(x);
 826                                 if (!err)
 827                                         cnt++;
 828
 829                                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
 830                                 goto restart;
 831                         }
 832                 }
 833         }
 834         if (cnt)
 835                 err = 0;
 836
 837 out:
 838         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 839         return err;
 840 }
 841 EXPORT_SYMBOL(xfrm_dev_state_flush);
 842
 843 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
 844 {
 845         spin_lock_bh(&net->xfrm.xfrm_state_lock);
 846         si->sadcnt = net->xfrm.state_num;
 847         si->sadhcnt = net->xfrm.state_hmask + 1;
 848         si->sadhmcnt = xfrm_state_hashmax;
 849         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 850 }
 851 EXPORT_SYMBOL(xfrm_sad_getinfo);
 852
 853 static void
 854 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 855 {
 856         const struct flowi4 *fl4 = &fl->u.ip4;
 857
 858         sel->daddr.a4 = fl4->daddr;
 859         sel->saddr.a4 = fl4->saddr;
 860         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
 861         sel->dport_mask = htons(0xffff);
 862         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
 863         sel->sport_mask = htons(0xffff);
 864         sel->family = AF_INET;
 865         sel->prefixlen_d = 32;
 866         sel->prefixlen_s = 32;
 867         sel->proto = fl4->flowi4_proto;
 868         sel->ifindex = fl4->flowi4_oif;
 869 }
 870
 871 static void
 872 __xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 873 {
 874         const struct flowi6 *fl6 = &fl->u.ip6;
 875
 876         /* Initialize temporary selector matching only to current session. */
 877         *(struct in6_addr *)&sel->daddr = fl6->daddr;
 878         *(struct in6_addr *)&sel->saddr = fl6->saddr;
 879         sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
 880         sel->dport_mask = htons(0xffff);
 881         sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
 882         sel->sport_mask = htons(0xffff);
 883         sel->family = AF_INET6;
 884         sel->prefixlen_d = 128;
 885         sel->prefixlen_s = 128;
 886         sel->proto = fl6->flowi6_proto;
 887         sel->ifindex = fl6->flowi6_oif;
 888 }
 889
 890 static void
 891 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
 892                     const struct xfrm_tmpl *tmpl,
 893                     const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 894                     unsigned short family)
 895 {
 896         switch (family) {
 897         case AF_INET:
 898                 __xfrm4_init_tempsel(&x->sel, fl);
 899                 break;
 900         case AF_INET6:
 901                 __xfrm6_init_tempsel(&x->sel, fl);
 902                 break;
 903         }
 904
 905         x->id = tmpl->id;
 906
 907         switch (tmpl->encap_family) {
 908         case AF_INET:
 909                 if (x->id.daddr.a4 == 0)
 910                         x->id.daddr.a4 = daddr->a4;
 911                 x->props.saddr = tmpl->saddr;
 912                 if (x->props.saddr.a4 == 0)
 913                         x->props.saddr.a4 = saddr->a4;
 914                 break;
 915         case AF_INET6:
 916                 if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
 917                         memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
 918                 memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
 919                 if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
 920                         memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
 921                 break;
 922         }
 923
 924         x->props.mode = tmpl->mode;
 925         x->props.reqid = tmpl->reqid;
 926         x->props.family = tmpl->encap_family;
 927 }
 928
 929 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
 930                                               const xfrm_address_t *daddr,
 931                                               __be32 spi, u8 proto,
 932                                               unsigned short family)
 933 {
 934         unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
 935         struct xfrm_state *x;
 936
 937         hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
 938                 if (x->props.family != family ||
 939                     x->id.spi       != spi ||
 940                     x->id.proto     != proto ||
 941                     !xfrm_addr_equal(&x->id.daddr, daddr, family))
 942                         continue;
 943
 944                 if ((mark & x->mark.m) != x->mark.v)
 945                         continue;
 946                 if (!xfrm_state_hold_rcu(x))
 947                         continue;
 948                 return x;
 949         }
 950
 951         return NULL;
 952 }
 953
 954 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
 955                                                      const xfrm_address_t *daddr,
 956                                                      const xfrm_address_t *saddr,
 957                                                      u8 proto, unsigned short family)
 958 {
 959         unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
 960         struct xfrm_state *x;
 961
 962         hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
 963                 if (x->props.family != family ||
 964                     x->id.proto     != proto ||
 965                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
 966                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
 967                         continue;
 968
 969                 if ((mark & x->mark.m) != x->mark.v)
 970                         continue;
 971                 if (!xfrm_state_hold_rcu(x))
 972                         continue;
 973                 return x;
 974         }
 975
 976         return NULL;
 977 }
 978
 979 static inline struct xfrm_state *
 980 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 981 {
 982         struct net *net = xs_net(x);
 983         u32 mark = x->mark.v & x->mark.m;
 984
 985         if (use_spi)
 986                 return __xfrm_state_lookup(net, mark, &x->id.daddr,
 987                                            x->id.spi, x->id.proto, family);
 988         else
 989                 return __xfrm_state_lookup_byaddr(net, mark,
 990                                                   &x->id.daddr,
 991                                                   &x->props.saddr,
 992                                                   x->id.proto, family);
 993 }
 994
 995 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
 996 {
 997         if (have_hash_collision &&
 998             (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
 999             net->xfrm.state_num > net->xfrm.state_hmask)
1000                 schedule_work(&net->xfrm.state_hash_work);
1001 }
1002
1003 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
1004                                const struct flowi *fl, unsigned short family,
1005                                struct xfrm_state **best, int *acq_in_progress,
1006                                int *error)
1007 {
1008         /* Resolution logic:
1009          * 1. There is a valid state with matching selector. Done.
1010          * 2. Valid state with inappropriate selector. Skip.
1011          *
1012          * Entering area of "sysdeps".
1013          *
1014          * 3. If state is not valid, selector is temporary, it selects
1015          *    only session which triggered previous resolution. Key
1016          *    manager will do something to install a state with proper
1017          *    selector.
1018          */
1019         if (x->km.state == XFRM_STATE_VALID) {
1020                 if ((x->sel.family &&
1021                      (x->sel.family != family ||
1022                       !xfrm_selector_match(&x->sel, fl, family))) ||
1023                     !security_xfrm_state_pol_flow_match(x, pol,
1024                                                         &fl->u.__fl_common))
1025                         return;
1026
1027                 if (!*best ||
1028                     (*best)->km.dying > x->km.dying ||
1029                     ((*best)->km.dying == x->km.dying &&
1030                      (*best)->curlft.add_time < x->curlft.add_time))
1031                         *best = x;
1032         } else if (x->km.state == XFRM_STATE_ACQ) {
1033                 *acq_in_progress = 1;
1034         } else if (x->km.state == XFRM_STATE_ERROR ||
1035                    x->km.state == XFRM_STATE_EXPIRED) {
1036                 if ((!x->sel.family ||
1037                      (x->sel.family == family &&
1038                       xfrm_selector_match(&x->sel, fl, family))) &&
1039                     security_xfrm_state_pol_flow_match(x, pol,
1040                                                        &fl->u.__fl_common))
1041                         *error = -ESRCH;
1042         }
1043 }
1044
1045 struct xfrm_state *
1046 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1047                 const struct flowi *fl, struct xfrm_tmpl *tmpl,
1048                 struct xfrm_policy *pol, int *err,
1049                 unsigned short family, u32 if_id)
1050 {
1051         static xfrm_address_t saddr_wildcard = { };
1052         struct net *net = xp_net(pol);
1053         unsigned int h, h_wildcard;
1054         struct xfrm_state *x, *x0, *to_put;
1055         int acquire_in_progress = 0;
1056         int error = 0;
1057         struct xfrm_state *best = NULL;
1058         u32 mark = pol->mark.v & pol->mark.m;
1059         unsigned short encap_family = tmpl->encap_family;
1060         unsigned int sequence;
1061         struct km_event c;
1062
1063         to_put = NULL;
1064
1065         sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
1066
1067         rcu_read_lock();
1068         h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
1069         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
1070                 if (x->props.family == encap_family &&
1071                     x->props.reqid == tmpl->reqid &&
1072                     (mark & x->mark.m) == x->mark.v &&
1073                     x->if_id == if_id &&
1074                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1075                     xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
1076                     tmpl->mode == x->props.mode &&
1077                     tmpl->id.proto == x->id.proto &&
1078                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1079                         xfrm_state_look_at(pol, x, fl, family,
1080                                            &best, &acquire_in_progress, &error);
1081         }
1082         if (best || acquire_in_progress)
1083                 goto found;
1084
1085         h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
1086         hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
1087                 if (x->props.family == encap_family &&
1088                     x->props.reqid == tmpl->reqid &&
1089                     (mark & x->mark.m) == x->mark.v &&
1090                     x->if_id == if_id &&
1091                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1092                     xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
1093                     tmpl->mode == x->props.mode &&
1094                     tmpl->id.proto == x->id.proto &&
1095                     (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
1096                         xfrm_state_look_at(pol, x, fl, family,
1097                                            &best, &acquire_in_progress, &error);
1098         }
1099
1100 found:
1101         x = best;
1102         if (!x && !error && !acquire_in_progress) {
1103                 if (tmpl->id.spi &&
1104                     (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
1105                                               tmpl->id.proto, encap_family)) != NULL) {
1106                         to_put = x0;
1107                         error = -EEXIST;
1108                         goto out;
1109                 }
1110
1111                 c.net = net;
1112                 /* If the KMs have no listeners (yet...), avoid allocating an SA
1113                  * for each and every packet - garbage collection might not
1114                  * handle the flood.
1115                  */
1116                 if (!km_is_alive(&c)) {
1117                         error = -ESRCH;
1118                         goto out;
1119                 }
1120
1121                 x = xfrm_state_alloc(net);
1122                 if (x == NULL) {
1123                         error = -ENOMEM;
1124                         goto out;
1125                 }
1126                 /* Initialize temporary state matching only
1127                  * to current session. */
1128                 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1129                 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1130                 x->if_id = if_id;
1131
1132                 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1133                 if (error) {
1134                         x->km.state = XFRM_STATE_DEAD;
1135                         to_put = x;
1136                         x = NULL;
1137                         goto out;
1138                 }
1139
1140                 if (km_query(x, tmpl, pol) == 0) {
1141                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1142                         x->km.state = XFRM_STATE_ACQ;
1143                         list_add(&x->km.all, &net->xfrm.state_all);
1144                         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1145                         h = xfrm_src_hash(net, daddr, saddr, encap_family);
1146                         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1147                         if (x->id.spi) {
1148                                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1149                                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1150                         }
1151                         x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1152                         hrtimer_start(&x->mtimer,
1153                                       ktime_set(net->xfrm.sysctl_acq_expires, 0),
1154                                       HRTIMER_MODE_REL_SOFT);
1155                         net->xfrm.state_num++;
1156                         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1157                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1158                 } else {
1159                         x->km.state = XFRM_STATE_DEAD;
1160                         to_put = x;
1161                         x = NULL;
1162                         error = -ESRCH;
1163                 }
1164         }
1165 out:
1166         if (x) {
1167                 if (!xfrm_state_hold_rcu(x)) {
1168                         *err = -EAGAIN;
1169                         x = NULL;
1170                 }
1171         } else {
1172                 *err = acquire_in_progress ? -EAGAIN : error;
1173         }
1174         rcu_read_unlock();
1175         if (to_put)
1176                 xfrm_state_put(to_put);
1177
1178         if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
1179                 *err = -EAGAIN;
1180                 if (x) {
1181                         xfrm_state_put(x);
1182                         x = NULL;
1183                 }
1184         }
1185
1186         return x;
1187 }
1188
1189 struct xfrm_state *
1190 xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
1191                     xfrm_address_t *daddr, xfrm_address_t *saddr,
1192                     unsigned short family, u8 mode, u8 proto, u32 reqid)
1193 {
1194         unsigned int h;
1195         struct xfrm_state *rx = NULL, *x = NULL;
1196
1197         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1198         h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1199         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1200                 if (x->props.family == family &&
1201                     x->props.reqid == reqid &&
1202                     (mark & x->mark.m) == x->mark.v &&
1203                     x->if_id == if_id &&
1204                     !(x->props.flags & XFRM_STATE_WILDRECV) &&
1205                     xfrm_state_addr_check(x, daddr, saddr, family) &&
1206                     mode == x->props.mode &&
1207                     proto == x->id.proto &&
1208                     x->km.state == XFRM_STATE_VALID) {
1209                         rx = x;
1210                         break;
1211                 }
1212         }
1213
1214         if (rx)
1215                 xfrm_state_hold(rx);
1216         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1217
1218
1219         return rx;
1220 }
1221 EXPORT_SYMBOL(xfrm_stateonly_find);
1222
1223 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1224                                               unsigned short family)
1225 {
1226         struct xfrm_state *x;
1227         struct xfrm_state_walk *w;
1228
1229         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1230         list_for_each_entry(w, &net->xfrm.state_all, all) {
1231                 x = container_of(w, struct xfrm_state, km);
1232                 if (x->props.family != family ||
1233                         x->id.spi != spi)
1234                         continue;
1235
1236                 xfrm_state_hold(x);
1237                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1238                 return x;
1239         }
1240         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1241         return NULL;
1242 }
1243 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1244
1245 static void __xfrm_state_insert(struct xfrm_state *x)
1246 {
1247         struct net *net = xs_net(x);
1248         unsigned int h;
1249
1250         list_add(&x->km.all, &net->xfrm.state_all);
1251
1252         h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1253                           x->props.reqid, x->props.family);
1254         hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1255
1256         h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1257         hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1258
1259         if (x->id.spi) {
1260                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1261                                   x->props.family);
1262
1263                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1264         }
1265
1266         hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
1267         if (x->replay_maxage)
1268                 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1269
1270         net->xfrm.state_num++;
1271
1272         xfrm_hash_grow_check(net, x->bydst.next != NULL);
1273 }
1274
1275 /* net->xfrm.xfrm_state_lock is held */
1276 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1277 {
1278         struct net *net = xs_net(xnew);
1279         unsigned short family = xnew->props.family;
1280         u32 reqid = xnew->props.reqid;
1281         struct xfrm_state *x;
1282         unsigned int h;
1283         u32 mark = xnew->mark.v & xnew->mark.m;
1284         u32 if_id = xnew->if_id;
1285
1286         h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1287         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1288                 if (x->props.family     == family &&
1289                     x->props.reqid      == reqid &&
1290                     x->if_id            == if_id &&
1291                     (mark & x->mark.m) == x->mark.v &&
1292                     xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1293                     xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1294                         x->genid++;
1295         }
1296 }
1297
1298 void xfrm_state_insert(struct xfrm_state *x)
1299 {
1300         struct net *net = xs_net(x);
1301
1302         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1303         __xfrm_state_bump_genids(x);
1304         __xfrm_state_insert(x);
1305         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1306 }
1307 EXPORT_SYMBOL(xfrm_state_insert);
1308
1309 /* net->xfrm.xfrm_state_lock is held */
1310 static struct xfrm_state *__find_acq_core(struct net *net,
1311                                           const struct xfrm_mark *m,
1312                                           unsigned short family, u8 mode,
1313                                           u32 reqid, u32 if_id, u8 proto,
1314                                           const xfrm_address_t *daddr,
1315                                           const xfrm_address_t *saddr,
1316                                           int create)
1317 {
1318         unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1319         struct xfrm_state *x;
1320         u32 mark = m->v & m->m;
1321
1322         hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1323                 if (x->props.reqid  != reqid ||
1324                     x->props.mode   != mode ||
1325                     x->props.family != family ||
1326                     x->km.state     != XFRM_STATE_ACQ ||
1327                     x->id.spi       != 0 ||
1328                     x->id.proto     != proto ||
1329                     (mark & x->mark.m) != x->mark.v ||
1330                     !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1331                     !xfrm_addr_equal(&x->props.saddr, saddr, family))
1332                         continue;
1333
1334                 xfrm_state_hold(x);
1335                 return x;
1336         }
1337
1338         if (!create)
1339                 return NULL;
1340
1341         x = xfrm_state_alloc(net);
1342         if (likely(x)) {
1343                 switch (family) {
1344                 case AF_INET:
1345                         x->sel.daddr.a4 = daddr->a4;
1346                         x->sel.saddr.a4 = saddr->a4;
1347                         x->sel.prefixlen_d = 32;
1348                         x->sel.prefixlen_s = 32;
1349                         x->props.saddr.a4 = saddr->a4;
1350                         x->id.daddr.a4 = daddr->a4;
1351                         break;
1352
1353                 case AF_INET6:
1354                         x->sel.daddr.in6 = daddr->in6;
1355                         x->sel.saddr.in6 = saddr->in6;
1356                         x->sel.prefixlen_d = 128;
1357                         x->sel.prefixlen_s = 128;
1358                         x->props.saddr.in6 = saddr->in6;
1359                         x->id.daddr.in6 = daddr->in6;
1360                         break;
1361                 }
1362
1363                 x->km.state = XFRM_STATE_ACQ;
1364                 x->id.proto = proto;
1365                 x->props.family = family;
1366                 x->props.mode = mode;
1367                 x->props.reqid = reqid;
1368                 x->if_id = if_id;
1369                 x->mark.v = m->v;
1370                 x->mark.m = m->m;
1371                 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1372                 xfrm_state_hold(x);
1373                 hrtimer_start(&x->mtimer,
1374                               ktime_set(net->xfrm.sysctl_acq_expires, 0),
1375                               HRTIMER_MODE_REL_SOFT);
1376                 list_add(&x->km.all, &net->xfrm.state_all);
1377                 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1378                 h = xfrm_src_hash(net, daddr, saddr, family);
1379                 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1380
1381                 net->xfrm.state_num++;
1382
1383                 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1384         }
1385
1386         return x;
1387 }
1388
1389 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1390
1391 int xfrm_state_add(struct xfrm_state *x)
1392 {
1393         struct net *net = xs_net(x);
1394         struct xfrm_state *x1, *to_put;
1395         int family;
1396         int err;
1397         u32 mark = x->mark.v & x->mark.m;
1398         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1399
1400         family = x->props.family;
1401
1402         to_put = NULL;
1403
1404         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1405
1406         x1 = __xfrm_state_locate(x, use_spi, family);
1407         if (x1) {
1408                 to_put = x1;
1409                 x1 = NULL;
1410                 err = -EEXIST;
1411                 goto out;
1412         }
1413
1414         if (use_spi && x->km.seq) {
1415                 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1416                 if (x1 && ((x1->id.proto != x->id.proto) ||
1417                     !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1418                         to_put = x1;
1419                         x1 = NULL;
1420                 }
1421         }
1422
1423         if (use_spi && !x1)
1424                 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1425                                      x->props.reqid, x->if_id, x->id.proto,
1426                                      &x->id.daddr, &x->props.saddr, 0);
1427
1428         __xfrm_state_bump_genids(x);
1429         __xfrm_state_insert(x);
1430         err = 0;
1431
1432 out:
1433         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1434
1435         if (x1) {
1436                 xfrm_state_delete(x1);
1437                 xfrm_state_put(x1);
1438         }
1439
1440         if (to_put)
1441                 xfrm_state_put(to_put);
1442
1443         return err;
1444 }
1445 EXPORT_SYMBOL(xfrm_state_add);
1446
1447 #ifdef CONFIG_XFRM_MIGRATE
1448 static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
1449 {
1450         struct xfrm_user_sec_ctx *uctx;
1451         int size = sizeof(*uctx) + security->ctx_len;
1452         int err;
1453
1454         uctx = kmalloc(size, GFP_KERNEL);
1455         if (!uctx)
1456                 return -ENOMEM;
1457
1458         uctx->exttype = XFRMA_SEC_CTX;
1459         uctx->len = size;
1460         uctx->ctx_doi = security->ctx_doi;
1461         uctx->ctx_alg = security->ctx_alg;
1462         uctx->ctx_len = security->ctx_len;
1463         memcpy(uctx + 1, security->ctx_str, security->ctx_len);
1464         err = security_xfrm_state_alloc(x, uctx);
1465         kfree(uctx);
1466         if (err)
1467                 return err;
1468
1469         return 0;
1470 }
1471
1472 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1473                                            struct xfrm_encap_tmpl *encap)
1474 {
1475         struct net *net = xs_net(orig);
1476         struct xfrm_state *x = xfrm_state_alloc(net);
1477         if (!x)
1478                 goto out;
1479
1480         memcpy(&x->id, &orig->id, sizeof(x->id));
1481         memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1482         memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1483         x->props.mode = orig->props.mode;
1484         x->props.replay_window = orig->props.replay_window;
1485         x->props.reqid = orig->props.reqid;
1486         x->props.family = orig->props.family;
1487         x->props.saddr = orig->props.saddr;
1488
1489         if (orig->aalg) {
1490                 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1491                 if (!x->aalg)
1492                         goto error;
1493         }
1494         x->props.aalgo = orig->props.aalgo;
1495
1496         if (orig->aead) {
1497                 x->aead = xfrm_algo_aead_clone(orig->aead);
1498                 x->geniv = orig->geniv;
1499                 if (!x->aead)
1500                         goto error;
1501         }
1502         if (orig->ealg) {
1503                 x->ealg = xfrm_algo_clone(orig->ealg);
1504                 if (!x->ealg)
1505                         goto error;
1506         }
1507         x->props.ealgo = orig->props.ealgo;
1508
1509         if (orig->calg) {
1510                 x->calg = xfrm_algo_clone(orig->calg);
1511                 if (!x->calg)
1512                         goto error;
1513         }
1514         x->props.calgo = orig->props.calgo;
1515
1516         if (encap || orig->encap) {
1517                 if (encap)
1518                         x->encap = kmemdup(encap, sizeof(*x->encap),
1519                                         GFP_KERNEL);
1520                 else
1521                         x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1522                                         GFP_KERNEL);
1523
1524                 if (!x->encap)
1525                         goto error;
1526         }
1527
1528         if (orig->security)
1529                 if (clone_security(x, orig->security))
1530                         goto error;
1531
1532         if (orig->coaddr) {
1533                 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1534                                     GFP_KERNEL);
1535                 if (!x->coaddr)
1536                         goto error;
1537         }
1538
1539         if (orig->replay_esn) {
1540                 if (xfrm_replay_clone(x, orig))
1541                         goto error;
1542         }
1543
1544         memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1545         memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
1546
1547         if (xfrm_init_state(x) < 0)
1548                 goto error;
1549
1550         x->props.flags = orig->props.flags;
1551         x->props.extra_flags = orig->props.extra_flags;
1552
1553         x->if_id = orig->if_id;
1554         x->tfcpad = orig->tfcpad;
1555         x->replay_maxdiff = orig->replay_maxdiff;
1556         x->replay_maxage = orig->replay_maxage;
1557         memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1558         x->km.state = orig->km.state;
1559         x->km.seq = orig->km.seq;
1560         x->replay = orig->replay;
1561         x->preplay = orig->preplay;
1562
1563         return x;
1564
1565  error:
1566         xfrm_state_put(x);
1567 out:
1568         return NULL;
1569 }
1570
1571 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1572 {
1573         unsigned int h;
1574         struct xfrm_state *x = NULL;
1575
1576         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1577
1578         if (m->reqid) {
1579                 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1580                                   m->reqid, m->old_family);
1581                 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1582                         if (x->props.mode != m->mode ||
1583                             x->id.proto != m->proto)
1584                                 continue;
1585                         if (m->reqid && x->props.reqid != m->reqid)
1586                                 continue;
1587                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1588                                              m->old_family) ||
1589                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1590                                              m->old_family))
1591                                 continue;
1592                         xfrm_state_hold(x);
1593                         break;
1594                 }
1595         } else {
1596                 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1597                                   m->old_family);
1598                 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1599                         if (x->props.mode != m->mode ||
1600                             x->id.proto != m->proto)
1601                                 continue;
1602                         if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1603                                              m->old_family) ||
1604                             !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1605                                              m->old_family))
1606                                 continue;
1607                         xfrm_state_hold(x);
1608                         break;
1609                 }
1610         }
1611
1612         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1613
1614         return x;
1615 }
1616 EXPORT_SYMBOL(xfrm_migrate_state_find);
1617
1618 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1619                                       struct xfrm_migrate *m,
1620                                       struct xfrm_encap_tmpl *encap)
1621 {
1622         struct xfrm_state *xc;
1623
1624         xc = xfrm_state_clone(x, encap);
1625         if (!xc)
1626                 return NULL;
1627
1628         memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1629         memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1630
1631         /* add state */
1632         if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1633                 /* a care is needed when the destination address of the
1634                    state is to be updated as it is a part of triplet */
1635                 xfrm_state_insert(xc);
1636         } else {
1637                 if (xfrm_state_add(xc) < 0)
1638                         goto error;
1639         }
1640
1641         return xc;
1642 error:
1643         xfrm_state_put(xc);
1644         return NULL;
1645 }
1646 EXPORT_SYMBOL(xfrm_state_migrate);
1647 #endif
1648
1649 int xfrm_state_update(struct xfrm_state *x)
1650 {
1651         struct xfrm_state *x1, *to_put;
1652         int err;
1653         int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1654         struct net *net = xs_net(x);
1655
1656         to_put = NULL;
1657
1658         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1659         x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1660
1661         err = -ESRCH;
1662         if (!x1)
1663                 goto out;
1664
1665         if (xfrm_state_kern(x1)) {
1666                 to_put = x1;
1667                 err = -EEXIST;
1668                 goto out;
1669         }
1670
1671         if (x1->km.state == XFRM_STATE_ACQ) {
1672                 __xfrm_state_insert(x);
1673                 x = NULL;
1674         }
1675         err = 0;
1676
1677 out:
1678         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1679
1680         if (to_put)
1681                 xfrm_state_put(to_put);
1682
1683         if (err)
1684                 return err;
1685
1686         if (!x) {
1687                 xfrm_state_delete(x1);
1688                 xfrm_state_put(x1);
1689                 return 0;
1690         }
1691
1692         err = -EINVAL;
1693         spin_lock_bh(&x1->lock);
1694         if (likely(x1->km.state == XFRM_STATE_VALID)) {
1695                 if (x->encap && x1->encap &&
1696                     x->encap->encap_type == x1->encap->encap_type)
1697                         memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1698                 else if (x->encap || x1->encap)
1699                         goto fail;
1700
1701                 if (x->coaddr && x1->coaddr) {
1702                         memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1703                 }
1704                 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1705                         memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1706                 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1707                 x1->km.dying = 0;
1708
1709                 hrtimer_start(&x1->mtimer, ktime_set(1, 0),
1710                               HRTIMER_MODE_REL_SOFT);
1711                 if (x1->curlft.use_time)
1712                         xfrm_state_check_expire(x1);
1713
1714                 if (x->props.smark.m || x->props.smark.v || x->if_id) {
1715                         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1716
1717                         if (x->props.smark.m || x->props.smark.v)
1718                                 x1->props.smark = x->props.smark;
1719
1720                         if (x->if_id)
1721                                 x1->if_id = x->if_id;
1722
1723                         __xfrm_state_bump_genids(x1);
1724                         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1725                 }
1726
1727                 err = 0;
1728                 x->km.state = XFRM_STATE_DEAD;
1729                 __xfrm_state_put(x);
1730         }
1731
1732 fail:
1733         spin_unlock_bh(&x1->lock);
1734
1735         xfrm_state_put(x1);
1736
1737         return err;
1738 }
1739 EXPORT_SYMBOL(xfrm_state_update);
1740
1741 int xfrm_state_check_expire(struct xfrm_state *x)
1742 {
1743         if (!x->curlft.use_time)
1744                 x->curlft.use_time = ktime_get_real_seconds();
1745
1746         if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1747             x->curlft.packets >= x->lft.hard_packet_limit) {
1748                 x->km.state = XFRM_STATE_EXPIRED;
1749                 hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
1750                 return -EINVAL;
1751         }
1752
1753         if (!x->km.dying &&
1754             (x->curlft.bytes >= x->lft.soft_byte_limit ||
1755              x->curlft.packets >= x->lft.soft_packet_limit)) {
1756                 x->km.dying = 1;
1757                 km_state_expired(x, 0, 0);
1758         }
1759         return 0;
1760 }
1761 EXPORT_SYMBOL(xfrm_state_check_expire);
1762
1763 struct xfrm_state *
1764 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1765                   u8 proto, unsigned short family)
1766 {
1767         struct xfrm_state *x;
1768
1769         rcu_read_lock();
1770         x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1771         rcu_read_unlock();
1772         return x;
1773 }
1774 EXPORT_SYMBOL(xfrm_state_lookup);
1775
1776 struct xfrm_state *
1777 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1778                          const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1779                          u8 proto, unsigned short family)
1780 {
1781         struct xfrm_state *x;
1782
1783         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1784         x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1785         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1786         return x;
1787 }
1788 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1789
1790 struct xfrm_state *
1791 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1792               u32 if_id, u8 proto, const xfrm_address_t *daddr,
1793               const xfrm_address_t *saddr, int create, unsigned short family)
1794 {
1795         struct xfrm_state *x;
1796
1797         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1798         x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
1799         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1800
1801         return x;
1802 }
1803 EXPORT_SYMBOL(xfrm_find_acq);
1804
1805 #ifdef CONFIG_XFRM_SUB_POLICY
1806 #if IS_ENABLED(CONFIG_IPV6)
1807 /* distribution counting sort function for xfrm_state and xfrm_tmpl */
1808 static void
1809 __xfrm6_sort(void **dst, void **src, int n,
1810              int (*cmp)(const void *p), int maxclass)
1811 {
1812         int count[XFRM_MAX_DEPTH] = { };
1813         int class[XFRM_MAX_DEPTH];
1814         int i;
1815
1816         for (i = 0; i < n; i++) {
1817                 int c = cmp(src[i]);
1818
1819                 class[i] = c;
1820                 count[c]++;
1821         }
1822
1823         for (i = 2; i < maxclass; i++)
1824                 count[i] += count[i - 1];
1825
1826         for (i = 0; i < n; i++) {
1827                 dst[count[class[i] - 1]++] = src[i];
1828                 src[i] = NULL;
1829         }
1830 }
1831
1832 /* Rule for xfrm_state:
1833  *
1834  * rule 1: select IPsec transport except AH
1835  * rule 2: select MIPv6 RO or inbound trigger
1836  * rule 3: select IPsec transport AH
1837  * rule 4: select IPsec tunnel
1838  * rule 5: others
1839  */
1840 static int __xfrm6_state_sort_cmp(const void *p)
1841 {
1842         const struct xfrm_state *v = p;
1843
1844         switch (v->props.mode) {
1845         case XFRM_MODE_TRANSPORT:
1846                 if (v->id.proto != IPPROTO_AH)
1847                         return 1;
1848                 else
1849                         return 3;
1850 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1851         case XFRM_MODE_ROUTEOPTIMIZATION:
1852         case XFRM_MODE_IN_TRIGGER:
1853                 return 2;
1854 #endif
1855         case XFRM_MODE_TUNNEL:
1856         case XFRM_MODE_BEET:
1857                 return 4;
1858         }
1859         return 5;
1860 }
1861
1862 /* Rule for xfrm_tmpl:
1863  *
1864  * rule 1: select IPsec transport
1865  * rule 2: select MIPv6 RO or inbound trigger
1866  * rule 3: select IPsec tunnel
1867  * rule 4: others
1868  */
1869 static int __xfrm6_tmpl_sort_cmp(const void *p)
1870 {
1871         const struct xfrm_tmpl *v = p;
1872
1873         switch (v->mode) {
1874         case XFRM_MODE_TRANSPORT:
1875                 return 1;
1876 #if IS_ENABLED(CONFIG_IPV6_MIP6)
1877         case XFRM_MODE_ROUTEOPTIMIZATION:
1878         case XFRM_MODE_IN_TRIGGER:
1879                 return 2;
1880 #endif
1881         case XFRM_MODE_TUNNEL:
1882         case XFRM_MODE_BEET:
1883                 return 3;
1884         }
1885         return 4;
1886 }
1887 #else
1888 static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
1889 static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
1890
1891 static inline void
1892 __xfrm6_sort(void **dst, void **src, int n,
1893              int (*cmp)(const void *p), int maxclass)
1894 {
1895         int i;
1896
1897         for (i = 0; i < n; i++)
1898                 dst[i] = src[i];
1899 }
1900 #endif /* CONFIG_IPV6 */
1901
1902 void
1903 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1904                unsigned short family)
1905 {
1906         int i;
1907
1908         if (family == AF_INET6)
1909                 __xfrm6_sort((void **)dst, (void **)src, n,
1910                              __xfrm6_tmpl_sort_cmp, 5);
1911         else
1912                 for (i = 0; i < n; i++)
1913                         dst[i] = src[i];
1914 }
1915
1916 void
1917 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1918                 unsigned short family)
1919 {
1920         int i;
1921
1922         if (family == AF_INET6)
1923                 __xfrm6_sort((void **)dst, (void **)src, n,
1924                              __xfrm6_state_sort_cmp, 6);
1925         else
1926                 for (i = 0; i < n; i++)
1927                         dst[i] = src[i];
1928 }
1929 #endif
1930
1931 /* Silly enough, but I'm lazy to build resolution list */
1932
1933 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1934 {
1935         int i;
1936
1937         for (i = 0; i <= net->xfrm.state_hmask; i++) {
1938                 struct xfrm_state *x;
1939
1940                 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1941                         if (x->km.seq == seq &&
1942                             (mark & x->mark.m) == x->mark.v &&
1943                             x->km.state == XFRM_STATE_ACQ) {
1944                                 xfrm_state_hold(x);
1945                                 return x;
1946                         }
1947                 }
1948         }
1949         return NULL;
1950 }
1951
1952 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1953 {
1954         struct xfrm_state *x;
1955
1956         spin_lock_bh(&net->xfrm.xfrm_state_lock);
1957         x = __xfrm_find_acq_byseq(net, mark, seq);
1958         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1959         return x;
1960 }
1961 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1962
1963 u32 xfrm_get_acqseq(void)
1964 {
1965         u32 res;
1966         static atomic_t acqseq;
1967
1968         do {
1969                 res = atomic_inc_return(&acqseq);
1970         } while (!res);
1971
1972         return res;
1973 }
1974 EXPORT_SYMBOL(xfrm_get_acqseq);
1975
1976 int verify_spi_info(u8 proto, u32 min, u32 max)
1977 {
1978         switch (proto) {
1979         case IPPROTO_AH:
1980         case IPPROTO_ESP:
1981                 break;
1982
1983         case IPPROTO_COMP:
1984                 /* IPCOMP spi is 16-bits. */
1985                 if (max >= 0x10000)
1986                         return -EINVAL;
1987                 break;
1988
1989         default:
1990                 return -EINVAL;
1991         }
1992
1993         if (min > max)
1994                 return -EINVAL;
1995
1996         return 0;
1997 }
1998 EXPORT_SYMBOL(verify_spi_info);
1999
2000 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
2001 {
2002         struct net *net = xs_net(x);
2003         unsigned int h;
2004         struct xfrm_state *x0;
2005         int err = -ENOENT;
2006         __be32 minspi = htonl(low);
2007         __be32 maxspi = htonl(high);
2008         __be32 newspi = 0;
2009         u32 mark = x->mark.v & x->mark.m;
2010
2011         spin_lock_bh(&x->lock);
2012         if (x->km.state == XFRM_STATE_DEAD)
2013                 goto unlock;
2014
2015         err = 0;
2016         if (x->id.spi)
2017                 goto unlock;
2018
2019         err = -ENOENT;
2020
2021         if (minspi == maxspi) {
2022                 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
2023                 if (x0) {
2024                         xfrm_state_put(x0);
2025                         goto unlock;
2026                 }
2027                 newspi = minspi;
2028         } else {
2029                 u32 spi = 0;
2030                 for (h = 0; h < high-low+1; h++) {
2031                         spi = low + prandom_u32()%(high-low+1);
2032                         x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
2033                         if (x0 == NULL) {
2034                                 newspi = htonl(spi);
2035                                 break;
2036                         }
2037                         xfrm_state_put(x0);
2038                 }
2039         }
2040         if (newspi) {
2041                 spin_lock_bh(&net->xfrm.xfrm_state_lock);
2042                 x->id.spi = newspi;
2043                 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
2044                 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
2045                 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2046
2047                 err = 0;
2048         }
2049
2050 unlock:
2051         spin_unlock_bh(&x->lock);
2052
2053         return err;
2054 }
2055 EXPORT_SYMBOL(xfrm_alloc_spi);
2056
2057 static bool __xfrm_state_filter_match(struct xfrm_state *x,
2058                                       struct xfrm_address_filter *filter)
2059 {
2060         if (filter) {
2061                 if ((filter->family == AF_INET ||
2062                      filter->family == AF_INET6) &&
2063                     x->props.family != filter->family)
2064                         return false;
2065
2066                 return addr_match(&x->props.saddr, &filter->saddr,
2067                                   filter->splen) &&
2068                        addr_match(&x->id.daddr, &filter->daddr,
2069                                   filter->dplen);
2070         }
2071         return true;
2072 }
2073
2074 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
2075                     int (*func)(struct xfrm_state *, int, void*),
2076                     void *data)
2077 {
2078         struct xfrm_state *state;
2079         struct xfrm_state_walk *x;
2080         int err = 0;
2081
2082         if (walk->seq != 0 && list_empty(&walk->all))
2083                 return 0;
2084
2085         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2086         if (list_empty(&walk->all))
2087                 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
2088         else
2089                 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
2090         list_for_each_entry_from(x, &net->xfrm.state_all, all) {
2091                 if (x->state == XFRM_STATE_DEAD)
2092                         continue;
2093                 state = container_of(x, struct xfrm_state, km);
2094                 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
2095                         continue;
2096                 if (!__xfrm_state_filter_match(state, walk->filter))
2097                         continue;
2098                 err = func(state, walk->seq, data);
2099                 if (err) {
2100                         list_move_tail(&walk->all, &x->all);
2101                         goto out;
2102                 }
2103                 walk->seq++;
2104         }
2105         if (walk->seq == 0) {
2106                 err = -ENOENT;
2107                 goto out;
2108         }
2109         list_del_init(&walk->all);
2110 out:
2111         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2112         return err;
2113 }
2114 EXPORT_SYMBOL(xfrm_state_walk);
2115
2116 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
2117                           struct xfrm_address_filter *filter)
2118 {
2119         INIT_LIST_HEAD(&walk->all);
2120         walk->proto = proto;
2121         walk->state = XFRM_STATE_DEAD;
2122         walk->seq = 0;
2123         walk->filter = filter;
2124 }
2125 EXPORT_SYMBOL(xfrm_state_walk_init);
2126
2127 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
2128 {
2129         kfree(walk->filter);
2130
2131         if (list_empty(&walk->all))
2132                 return;
2133
2134         spin_lock_bh(&net->xfrm.xfrm_state_lock);
2135         list_del(&walk->all);
2136         spin_unlock_bh(&net->xfrm.xfrm_state_lock);
2137 }
2138 EXPORT_SYMBOL(xfrm_state_walk_done);
2139
2140 static void xfrm_replay_timer_handler(struct timer_list *t)
2141 {
2142         struct xfrm_state *x = from_timer(x, t, rtimer);
2143
2144         spin_lock(&x->lock);
2145
2146         if (x->km.state == XFRM_STATE_VALID) {
2147                 if (xfrm_aevent_is_on(xs_net(x)))
2148                         x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
2149                 else
2150                         x->xflags |= XFRM_TIME_DEFER;
2151         }
2152
2153         spin_unlock(&x->lock);
2154 }
2155
2156 static LIST_HEAD(xfrm_km_list);
2157
2158 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2159 {
2160         struct xfrm_mgr *km;
2161
2162         rcu_read_lock();
2163         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2164                 if (km->notify_policy)
2165                         km->notify_policy(xp, dir, c);
2166         rcu_read_unlock();
2167 }
2168
2169 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
2170 {
2171         struct xfrm_mgr *km;
2172         rcu_read_lock();
2173         list_for_each_entry_rcu(km, &xfrm_km_list, list)
2174                 if (km->notify)
2175                         km->notify(x, c);
2176         rcu_read_unlock();
2177 }
2178
2179 EXPORT_SYMBOL(km_policy_notify);
2180 EXPORT_SYMBOL(km_state_notify);
2181
2182 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
2183 {
2184         struct km_event c;
2185
2186         c.data.hard = hard;
2187         c.portid = portid;
2188         c.event = XFRM_MSG_EXPIRE;
2189         km_state_notify(x, &c);
2190 }
2191
2192 EXPORT_SYMBOL(km_state_expired);
2193 /*
2194  * We send to all registered managers regardless of failure
2195  * We are happy with one success
2196 */
2197 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
2198 {
2199         int err = -EINVAL, acqret;
2200         struct xfrm_mgr *km;
2201
2202         rcu_read_lock();
2203         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2204                 acqret = km->acquire(x, t, pol);
2205                 if (!acqret)
2206                         err = acqret;
2207         }
2208         rcu_read_unlock();
2209         return err;
2210 }
2211 EXPORT_SYMBOL(km_query);
2212
2213 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
2214 {
2215         int err = -EINVAL;
2216         struct xfrm_mgr *km;
2217
2218         rcu_read_lock();
2219         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2220                 if (km->new_mapping)
2221                         err = km->new_mapping(x, ipaddr, sport);
2222                 if (!err)
2223                         break;
2224         }
2225         rcu_read_unlock();
2226         return err;
2227 }
2228 EXPORT_SYMBOL(km_new_mapping);
2229
2230 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
2231 {
2232         struct km_event c;
2233
2234         c.data.hard = hard;
2235         c.portid = portid;
2236         c.event = XFRM_MSG_POLEXPIRE;
2237         km_policy_notify(pol, dir, &c);
2238 }
2239 EXPORT_SYMBOL(km_policy_expired);
2240
2241 #ifdef CONFIG_XFRM_MIGRATE
2242 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2243                const struct xfrm_migrate *m, int num_migrate,
2244                const struct xfrm_kmaddress *k,
2245                const struct xfrm_encap_tmpl *encap)
2246 {
2247         int err = -EINVAL;
2248         int ret;
2249         struct xfrm_mgr *km;
2250
2251         rcu_read_lock();
2252         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2253                 if (km->migrate) {
2254                         ret = km->migrate(sel, dir, type, m, num_migrate, k,
2255                                           encap);
2256                         if (!ret)
2257                                 err = ret;
2258                 }
2259         }
2260         rcu_read_unlock();
2261         return err;
2262 }
2263 EXPORT_SYMBOL(km_migrate);
2264 #endif
2265
2266 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2267 {
2268         int err = -EINVAL;
2269         int ret;
2270         struct xfrm_mgr *km;
2271
2272         rcu_read_lock();
2273         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2274                 if (km->report) {
2275                         ret = km->report(net, proto, sel, addr);
2276                         if (!ret)
2277                                 err = ret;
2278                 }
2279         }
2280         rcu_read_unlock();
2281         return err;
2282 }
2283 EXPORT_SYMBOL(km_report);
2284
2285 static bool km_is_alive(const struct km_event *c)
2286 {
2287         struct xfrm_mgr *km;
2288         bool is_alive = false;
2289
2290         rcu_read_lock();
2291         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2292                 if (km->is_alive && km->is_alive(c)) {
2293                         is_alive = true;
2294                         break;
2295                 }
2296         }
2297         rcu_read_unlock();
2298
2299         return is_alive;
2300 }
2301
2302 #if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
2303 static DEFINE_SPINLOCK(xfrm_translator_lock);
2304 static struct xfrm_translator __rcu *xfrm_translator;
2305
2306 struct xfrm_translator *xfrm_get_translator(void)
2307 {
2308         struct xfrm_translator *xtr;
2309
2310         rcu_read_lock();
2311         xtr = rcu_dereference(xfrm_translator);
2312         if (unlikely(!xtr))
2313                 goto out;
2314         if (!try_module_get(xtr->owner))
2315                 xtr = NULL;
2316 out:
2317         rcu_read_unlock();
2318         return xtr;
2319 }
2320 EXPORT_SYMBOL_GPL(xfrm_get_translator);
2321
2322 void xfrm_put_translator(struct xfrm_translator *xtr)
2323 {
2324         module_put(xtr->owner);
2325 }
2326 EXPORT_SYMBOL_GPL(xfrm_put_translator);
2327
2328 int xfrm_register_translator(struct xfrm_translator *xtr)
2329 {
2330         int err = 0;
2331
2332         spin_lock_bh(&xfrm_translator_lock);
2333         if (unlikely(xfrm_translator != NULL))
2334                 err = -EEXIST;
2335         else
2336                 rcu_assign_pointer(xfrm_translator, xtr);
2337         spin_unlock_bh(&xfrm_translator_lock);
2338
2339         return err;
2340 }
2341 EXPORT_SYMBOL_GPL(xfrm_register_translator);
2342
2343 int xfrm_unregister_translator(struct xfrm_translator *xtr)
2344 {
2345         int err = 0;
2346
2347         spin_lock_bh(&xfrm_translator_lock);
2348         if (likely(xfrm_translator != NULL)) {
2349                 if (rcu_access_pointer(xfrm_translator) != xtr)
2350                         err = -EINVAL;
2351                 else
2352                         RCU_INIT_POINTER(xfrm_translator, NULL);
2353         }
2354         spin_unlock_bh(&xfrm_translator_lock);
2355         synchronize_rcu();
2356
2357         return err;
2358 }
2359 EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
2360 #endif
2361
2362 int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
2363 {
2364         int err;
2365         u8 *data;
2366         struct xfrm_mgr *km;
2367         struct xfrm_policy *pol = NULL;
2368
2369         if (sockptr_is_null(optval) && !optlen) {
2370                 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2371                 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2372                 __sk_dst_reset(sk);
2373                 return 0;
2374         }
2375
2376         if (optlen <= 0 || optlen > PAGE_SIZE)
2377                 return -EMSGSIZE;
2378
2379         data = memdup_sockptr(optval, optlen);
2380         if (IS_ERR(data))
2381                 return PTR_ERR(data);
2382
2383         if (in_compat_syscall()) {
2384                 struct xfrm_translator *xtr = xfrm_get_translator();
2385
2386                 if (!xtr) {
2387                         kfree(data);
2388                         return -EOPNOTSUPP;
2389                 }
2390
2391                 err = xtr->xlate_user_policy_sockptr(&data, optlen);
2392                 xfrm_put_translator(xtr);
2393                 if (err) {
2394                         kfree(data);
2395                         return err;
2396                 }
2397         }
2398
2399         err = -EINVAL;
2400         rcu_read_lock();
2401         list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2402                 pol = km->compile_policy(sk, optname, data,
2403                                          optlen, &err);
2404                 if (err >= 0)
2405                         break;
2406         }
2407         rcu_read_unlock();
2408
2409         if (err >= 0) {
2410                 xfrm_sk_policy_insert(sk, err, pol);
2411                 xfrm_pol_put(pol);
2412                 __sk_dst_reset(sk);
2413                 err = 0;
2414         }
2415
2416         kfree(data);
2417         return err;
2418 }
2419 EXPORT_SYMBOL(xfrm_user_policy);
2420
2421 static DEFINE_SPINLOCK(xfrm_km_lock);
2422
2423 int xfrm_register_km(struct xfrm_mgr *km)
2424 {
2425         spin_lock_bh(&xfrm_km_lock);
2426         list_add_tail_rcu(&km->list, &xfrm_km_list);
2427         spin_unlock_bh(&xfrm_km_lock);
2428         return 0;
2429 }
2430 EXPORT_SYMBOL(xfrm_register_km);
2431
2432 int xfrm_unregister_km(struct xfrm_mgr *km)
2433 {
2434         spin_lock_bh(&xfrm_km_lock);
2435         list_del_rcu(&km->list);
2436         spin_unlock_bh(&xfrm_km_lock);
2437         synchronize_rcu();
2438         return 0;
2439 }
2440 EXPORT_SYMBOL(xfrm_unregister_km);
2441
2442 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2443 {
2444         int err = 0;
2445
2446         if (WARN_ON(afinfo->family >= NPROTO))
2447                 return -EAFNOSUPPORT;
2448
2449         spin_lock_bh(&xfrm_state_afinfo_lock);
2450         if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2451                 err = -EEXIST;
2452         else
2453                 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2454         spin_unlock_bh(&xfrm_state_afinfo_lock);
2455         return err;
2456 }
2457 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2458
2459 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2460 {
2461         int err = 0, family = afinfo->family;
2462
2463         if (WARN_ON(family >= NPROTO))
2464                 return -EAFNOSUPPORT;
2465
2466         spin_lock_bh(&xfrm_state_afinfo_lock);
2467         if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2468                 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2469                         err = -EINVAL;
2470                 else
2471                         RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2472         }
2473         spin_unlock_bh(&xfrm_state_afinfo_lock);
2474         synchronize_rcu();
2475         return err;
2476 }
2477 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2478
2479 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2480 {
2481         if (unlikely(family >= NPROTO))
2482                 return NULL;
2483
2484         return rcu_dereference(xfrm_state_afinfo[family]);
2485 }
2486 EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
2487
2488 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2489 {
2490         struct xfrm_state_afinfo *afinfo;
2491         if (unlikely(family >= NPROTO))
2492                 return NULL;
2493         rcu_read_lock();
2494         afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2495         if (unlikely(!afinfo))
2496                 rcu_read_unlock();
2497         return afinfo;
2498 }
2499
2500 void xfrm_flush_gc(void)
2501 {
2502         flush_work(&xfrm_state_gc_work);
2503 }
2504 EXPORT_SYMBOL(xfrm_flush_gc);
2505
2506 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2507 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2508 {
2509         if (x->tunnel) {
2510                 struct xfrm_state *t = x->tunnel;
2511
2512                 if (atomic_read(&t->tunnel_users) == 2)
2513                         xfrm_state_delete(t);
2514                 atomic_dec(&t->tunnel_users);
2515                 xfrm_state_put_sync(t);
2516                 x->tunnel = NULL;
2517         }
2518 }
2519 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2520
2521 u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
2522 {
2523         const struct xfrm_type *type = READ_ONCE(x->type);
2524         struct crypto_aead *aead;
2525         u32 blksize, net_adj = 0;
2526
2527         if (x->km.state != XFRM_STATE_VALID ||
2528             !type || type->proto != IPPROTO_ESP)
2529                 return mtu - x->props.header_len;
2530
2531         aead = x->data;
2532         blksize = ALIGN(crypto_aead_blocksize(aead), 4);
2533
2534         switch (x->props.mode) {
2535         case XFRM_MODE_TRANSPORT:
2536         case XFRM_MODE_BEET:
2537                 if (x->props.family == AF_INET)
2538                         net_adj = sizeof(struct iphdr);
2539                 else if (x->props.family == AF_INET6)
2540                         net_adj = sizeof(struct ipv6hdr);
2541                 break;
2542         case XFRM_MODE_TUNNEL:
2543                 break;
2544         default:
2545                 WARN_ON_ONCE(1);
2546                 break;
2547         }
2548
2549         return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
2550                  net_adj) & ~(blksize - 1)) + net_adj - 2;
2551 }
2552 EXPORT_SYMBOL_GPL(xfrm_state_mtu);
2553
2554 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2555 {
2556         const struct xfrm_mode *inner_mode;
2557         const struct xfrm_mode *outer_mode;
2558         int family = x->props.family;
2559         int err;
2560
2561         if (family == AF_INET &&
2562             xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
2563                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
2564
2565         err = -EPROTONOSUPPORT;
2566
2567         if (x->sel.family != AF_UNSPEC) {
2568                 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2569                 if (inner_mode == NULL)
2570                         goto error;
2571
2572                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2573                     family != x->sel.family)
2574                         goto error;
2575
2576                 x->inner_mode = *inner_mode;
2577         } else {
2578                 const struct xfrm_mode *inner_mode_iaf;
2579                 int iafamily = AF_INET;
2580
2581                 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2582                 if (inner_mode == NULL)
2583                         goto error;
2584
2585                 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL))
2586                         goto error;
2587
2588                 x->inner_mode = *inner_mode;
2589
2590                 if (x->props.family == AF_INET)
2591                         iafamily = AF_INET6;
2592
2593                 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2594                 if (inner_mode_iaf) {
2595                         if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2596                                 x->inner_mode_iaf = *inner_mode_iaf;
2597                 }
2598         }
2599
2600         x->type = xfrm_get_type(x->id.proto, family);
2601         if (x->type == NULL)
2602                 goto error;
2603
2604         x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2605
2606         err = x->type->init_state(x);
2607         if (err)
2608                 goto error;
2609
2610         outer_mode = xfrm_get_mode(x->props.mode, family);
2611         if (!outer_mode) {
2612                 err = -EPROTONOSUPPORT;
2613                 goto error;
2614         }
2615
2616         x->outer_mode = *outer_mode;
2617         if (init_replay) {
2618                 err = xfrm_init_replay(x);
2619                 if (err)
2620                         goto error;
2621         }
2622
2623 error:
2624         return err;
2625 }
2626
2627 EXPORT_SYMBOL(__xfrm_init_state);
2628
2629 int xfrm_init_state(struct xfrm_state *x)
2630 {
2631         int err;
2632
2633         err = __xfrm_init_state(x, true, false);
2634         if (!err)
2635                 x->km.state = XFRM_STATE_VALID;
2636
2637         return err;
2638 }
2639
2640 EXPORT_SYMBOL(xfrm_init_state);
2641
2642 int __net_init xfrm_state_init(struct net *net)
2643 {
2644         unsigned int sz;
2645
2646         if (net_eq(net, &init_net))
2647                 xfrm_state_cache = KMEM_CACHE(xfrm_state,
2648                                               SLAB_HWCACHE_ALIGN | SLAB_PANIC);
2649
2650         INIT_LIST_HEAD(&net->xfrm.state_all);
2651
2652         sz = sizeof(struct hlist_head) * 8;
2653
2654         net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2655         if (!net->xfrm.state_bydst)
2656                 goto out_bydst;
2657         net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2658         if (!net->xfrm.state_bysrc)
2659                 goto out_bysrc;
2660         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2661         if (!net->xfrm.state_byspi)
2662                 goto out_byspi;
2663         net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2664
2665         net->xfrm.state_num = 0;
2666         INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2667         spin_lock_init(&net->xfrm.xfrm_state_lock);
2668         seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
2669                                &net->xfrm.xfrm_state_lock);
2670         return 0;
2671
2672 out_byspi:
2673         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2674 out_bysrc:
2675         xfrm_hash_free(net->xfrm.state_bydst, sz);
2676 out_bydst:
2677         return -ENOMEM;
2678 }
2679
2680 void xfrm_state_fini(struct net *net)
2681 {
2682         unsigned int sz;
2683
2684         flush_work(&net->xfrm.state_hash_work);
2685         flush_work(&xfrm_state_gc_work);
2686         xfrm_state_flush(net, 0, false, true);
2687
2688         WARN_ON(!list_empty(&net->xfrm.state_all));
2689
2690         sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2691         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2692         xfrm_hash_free(net->xfrm.state_byspi, sz);
2693         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2694         xfrm_hash_free(net->xfrm.state_bysrc, sz);
2695         WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2696         xfrm_hash_free(net->xfrm.state_bydst, sz);
2697 }
2698
2699 #ifdef CONFIG_AUDITSYSCALL
2700 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2701                                      struct audit_buffer *audit_buf)
2702 {
2703         struct xfrm_sec_ctx *ctx = x->security;
2704         u32 spi = ntohl(x->id.spi);
2705
2706         if (ctx)
2707                 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2708                                  ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2709
2710         switch (x->props.family) {
2711         case AF_INET:
2712                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2713                                  &x->props.saddr.a4, &x->id.daddr.a4);
2714                 break;
2715         case AF_INET6:
2716                 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2717                                  x->props.saddr.a6, x->id.daddr.a6);
2718                 break;
2719         }
2720
2721         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2722 }
2723
2724 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2725                                       struct audit_buffer *audit_buf)
2726 {
2727         const struct iphdr *iph4;
2728         const struct ipv6hdr *iph6;
2729
2730         switch (family) {
2731         case AF_INET:
2732                 iph4 = ip_hdr(skb);
2733                 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2734                                  &iph4->saddr, &iph4->daddr);
2735                 break;
2736         case AF_INET6:
2737                 iph6 = ipv6_hdr(skb);
2738                 audit_log_format(audit_buf,
2739                                  " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2740                                  &iph6->saddr, &iph6->daddr,
2741                                  iph6->flow_lbl[0] & 0x0f,
2742                                  iph6->flow_lbl[1],
2743                                  iph6->flow_lbl[2]);
2744                 break;
2745         }
2746 }
2747
2748 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2749 {
2750         struct audit_buffer *audit_buf;
2751
2752         audit_buf = xfrm_audit_start("SAD-add");
2753         if (audit_buf == NULL)
2754                 return;
2755         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2756         xfrm_audit_helper_sainfo(x, audit_buf);
2757         audit_log_format(audit_buf, " res=%u", result);
2758         audit_log_end(audit_buf);
2759 }
2760 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2761
2762 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2763 {
2764         struct audit_buffer *audit_buf;
2765
2766         audit_buf = xfrm_audit_start("SAD-delete");
2767         if (audit_buf == NULL)
2768                 return;
2769         xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2770         xfrm_audit_helper_sainfo(x, audit_buf);
2771         audit_log_format(audit_buf, " res=%u", result);
2772         audit_log_end(audit_buf);
2773 }
2774 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2775
2776 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2777                                       struct sk_buff *skb)
2778 {
2779         struct audit_buffer *audit_buf;
2780         u32 spi;
2781
2782         audit_buf = xfrm_audit_start("SA-replay-overflow");
2783         if (audit_buf == NULL)
2784                 return;
2785         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2786         /* don't record the sequence number because it's inherent in this kind
2787          * of audit message */
2788         spi = ntohl(x->id.spi);
2789         audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2790         audit_log_end(audit_buf);
2791 }
2792 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2793
2794 void xfrm_audit_state_replay(struct xfrm_state *x,
2795                              struct sk_buff *skb, __be32 net_seq)
2796 {
2797         struct audit_buffer *audit_buf;
2798         u32 spi;
2799
2800         audit_buf = xfrm_audit_start("SA-replayed-pkt");
2801         if (audit_buf == NULL)
2802                 return;
2803         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2804         spi = ntohl(x->id.spi);
2805         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2806                          spi, spi, ntohl(net_seq));
2807         audit_log_end(audit_buf);
2808 }
2809 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2810
2811 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2812 {
2813         struct audit_buffer *audit_buf;
2814
2815         audit_buf = xfrm_audit_start("SA-notfound");
2816         if (audit_buf == NULL)
2817                 return;
2818         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2819         audit_log_end(audit_buf);
2820 }
2821 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2822
2823 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2824                                __be32 net_spi, __be32 net_seq)
2825 {
2826         struct audit_buffer *audit_buf;
2827         u32 spi;
2828
2829         audit_buf = xfrm_audit_start("SA-notfound");
2830         if (audit_buf == NULL)
2831                 return;
2832         xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2833         spi = ntohl(net_spi);
2834         audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2835                          spi, spi, ntohl(net_seq));
2836         audit_log_end(audit_buf);
2837 }
2838 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2839
2840 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2841                               struct sk_buff *skb, u8 proto)
2842 {
2843         struct audit_buffer *audit_buf;
2844         __be32 net_spi;
2845         __be32 net_seq;
2846
2847         audit_buf = xfrm_audit_start("SA-icv-failure");
2848         if (audit_buf == NULL)
2849                 return;
2850         xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2851         if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2852                 u32 spi = ntohl(net_spi);
2853                 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2854                                  spi, spi, ntohl(net_seq));
2855         }
2856         audit_log_end(audit_buf);
2857 }
2858 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2859 #endif /* CONFIG_AUDITSYSCALL */